* [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
@ 2020-11-25 21:36 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
This series adds support for RISC-V Semihosting, version 0.2 as
specified here:
https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
This specification references the ARM semihosting release 2.0 as specified here:
https://static.docs.arm.com/100863/0200/semihosting.pdf
That specification includes several semihosting calls which were not
previously implemented. This series includes implementations for the
remaining calls so that both RISC-V and ARM versions are now complete.
Tests for release 2.0 can be found in picolibc on the semihost-2.0-all
branch:
https://github.com/picolibc/picolibc/tree/semihost-2.0-all
These tests uncovered a bug in the SYS_HEAPINFO implementation for
ARM, which has been fixed in this series as well.
The series is structured as follows:
1. Move shared semihosting files
2. Change public common semihosting APIs
3. Change internal semihosting interfaces
4. Fix SYS_HEAPINFO crash on ARM
5. Add RISC-V semihosting implementation
6-8. Add missing semihosting operations from release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
^ permalink raw reply [flat|nested] 54+ messages in thread
* [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
@ 2020-11-25 21:36 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
This series adds support for RISC-V Semihosting, version 0.2 as
specified here:
https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
This specification references the ARM semihosting release 2.0 as specified here:
https://static.docs.arm.com/100863/0200/semihosting.pdf
That specification includes several semihosting calls which were not
previously implemented. This series includes implementations for the
remaining calls so that both RISC-V and ARM versions are now complete.
Tests for release 2.0 can be found in picolibc on the semihost-2.0-all
branch:
https://github.com/picolibc/picolibc/tree/semihost-2.0-all
These tests uncovered a bug in the SYS_HEAPINFO implementation for
ARM, which has been fixed in this series as well.
The series is structured as follows:
1. Move shared semihosting files
2. Change public common semihosting APIs
3. Change internal semihosting interfaces
4. Fix SYS_HEAPINFO crash on ARM
5. Add RISC-V semihosting implementation
6-8. Add missing semihosting operations from release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
^ permalink raw reply [flat|nested] 54+ messages in thread
* [PATCH 1/8] semihosting: Move ARM semihosting code to shared directories [v3]
2020-11-25 21:36 ` Keith Packard
@ 2020-11-25 21:36 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard, Alistair Francis
This commit renames two files which provide ARM semihosting support so
that they can be shared by other architectures:
1. target/arm/arm-semi.c -> hw/semihosting/common-semi.c
2. linux-user/arm/semihost.c -> linux-user/semihost.c
The build system was modified use a new config variable,
CONFIG_ARM_COMPATIBLE_SEMIHOSTING, which has been added to the ARM
softmmu and linux-user default configs. The contents of the source
files has not been changed in this patch.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
----
v2
Place common-semi.c name in arm_ss, just as arm-semi.c was
v3
Create CONFIG_ARM_COMPATIBLE_SEMIHOSTING and assign in
arm config files
---
default-configs/devices/arm-softmmu.mak | 1 +
default-configs/targets/aarch64-linux-user.mak | 1 +
default-configs/targets/arm-linux-user.mak | 1 +
hw/semihosting/Kconfig | 3 +++
target/arm/arm-semi.c => hw/semihosting/common-semi.c | 0
hw/semihosting/meson.build | 3 +++
linux-user/arm/meson.build | 3 ---
linux-user/meson.build | 1 +
linux-user/{arm => }/semihost.c | 0
target/arm/meson.build | 2 --
10 files changed, 10 insertions(+), 5 deletions(-)
rename target/arm/arm-semi.c => hw/semihosting/common-semi.c (100%)
rename linux-user/{arm => }/semihost.c (100%)
diff --git a/default-configs/devices/arm-softmmu.mak b/default-configs/devices/arm-softmmu.mak
index 08a32123b4..0500156a0c 100644
--- a/default-configs/devices/arm-softmmu.mak
+++ b/default-configs/devices/arm-softmmu.mak
@@ -42,4 +42,5 @@ CONFIG_FSL_IMX25=y
CONFIG_FSL_IMX7=y
CONFIG_FSL_IMX6UL=y
CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
CONFIG_ALLWINNER_H3=y
diff --git a/default-configs/targets/aarch64-linux-user.mak b/default-configs/targets/aarch64-linux-user.mak
index 163c9209f4..4713253709 100644
--- a/default-configs/targets/aarch64-linux-user.mak
+++ b/default-configs/targets/aarch64-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=aarch64
TARGET_BASE_ARCH=arm
TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml
TARGET_HAS_BFLT=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/default-configs/targets/arm-linux-user.mak b/default-configs/targets/arm-linux-user.mak
index c7cd872e86..e741ffd4d3 100644
--- a/default-configs/targets/arm-linux-user.mak
+++ b/default-configs/targets/arm-linux-user.mak
@@ -3,3 +3,4 @@ TARGET_SYSTBL_ABI=common,oabi
TARGET_SYSTBL=syscall.tbl
TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml
TARGET_HAS_BFLT=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/hw/semihosting/Kconfig b/hw/semihosting/Kconfig
index efe0a30734..4c30dc6b16 100644
--- a/hw/semihosting/Kconfig
+++ b/hw/semihosting/Kconfig
@@ -1,3 +1,6 @@
config SEMIHOSTING
bool
+
+config ARM_COMPATIBLE_SEMIHOSTING
+ bool
diff --git a/target/arm/arm-semi.c b/hw/semihosting/common-semi.c
similarity index 100%
rename from target/arm/arm-semi.c
rename to hw/semihosting/common-semi.c
diff --git a/hw/semihosting/meson.build b/hw/semihosting/meson.build
index f40ac574c4..5b4a170270 100644
--- a/hw/semihosting/meson.build
+++ b/hw/semihosting/meson.build
@@ -2,3 +2,6 @@ specific_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files(
'config.c',
'console.c',
))
+
+specific_ss.add(when: ['CONFIG_ARM_COMPATIBLE_SEMIHOSTING'],
+ if_true: files('common-semi.c'))
diff --git a/linux-user/arm/meson.build b/linux-user/arm/meson.build
index 432984b58e..5a93c925cf 100644
--- a/linux-user/arm/meson.build
+++ b/linux-user/arm/meson.build
@@ -1,6 +1,3 @@
-linux_user_ss.add(when: 'TARGET_AARCH64', if_true: files('semihost.c'))
-linux_user_ss.add(when: 'TARGET_ARM', if_true: files('semihost.c'))
-
subdir('nwfpe')
syscall_nr_generators += {
diff --git a/linux-user/meson.build b/linux-user/meson.build
index 2b94e4ba24..7fe28d659e 100644
--- a/linux-user/meson.build
+++ b/linux-user/meson.build
@@ -16,6 +16,7 @@ linux_user_ss.add(rt)
linux_user_ss.add(when: 'TARGET_HAS_BFLT', if_true: files('flatload.c'))
linux_user_ss.add(when: 'TARGET_I386', if_true: files('vm86.c'))
+linux_user_ss.add(when: 'CONFIG_ARM_COMPATIBLE_SEMIHOSTING', if_true: files('semihost.c'))
syscall_nr_generators = {}
diff --git a/linux-user/arm/semihost.c b/linux-user/semihost.c
similarity index 100%
rename from linux-user/arm/semihost.c
rename to linux-user/semihost.c
diff --git a/target/arm/meson.build b/target/arm/meson.build
index f5de2a77b8..15b936c101 100644
--- a/target/arm/meson.build
+++ b/target/arm/meson.build
@@ -32,8 +32,6 @@ arm_ss.add(files(
))
arm_ss.add(zlib)
-arm_ss.add(when: 'CONFIG_TCG', if_true: files('arm-semi.c'))
-
arm_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c', 'kvm64.c'), if_false: files('kvm-stub.c'))
arm_ss.add(when: 'TARGET_AARCH64', if_true: files(
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 1/8] semihosting: Move ARM semihosting code to shared directories [v3]
@ 2020-11-25 21:36 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard, Alistair Francis
This commit renames two files which provide ARM semihosting support so
that they can be shared by other architectures:
1. target/arm/arm-semi.c -> hw/semihosting/common-semi.c
2. linux-user/arm/semihost.c -> linux-user/semihost.c
The build system was modified use a new config variable,
CONFIG_ARM_COMPATIBLE_SEMIHOSTING, which has been added to the ARM
softmmu and linux-user default configs. The contents of the source
files has not been changed in this patch.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
----
v2
Place common-semi.c name in arm_ss, just as arm-semi.c was
v3
Create CONFIG_ARM_COMPATIBLE_SEMIHOSTING and assign in
arm config files
---
default-configs/devices/arm-softmmu.mak | 1 +
default-configs/targets/aarch64-linux-user.mak | 1 +
default-configs/targets/arm-linux-user.mak | 1 +
hw/semihosting/Kconfig | 3 +++
target/arm/arm-semi.c => hw/semihosting/common-semi.c | 0
hw/semihosting/meson.build | 3 +++
linux-user/arm/meson.build | 3 ---
linux-user/meson.build | 1 +
linux-user/{arm => }/semihost.c | 0
target/arm/meson.build | 2 --
10 files changed, 10 insertions(+), 5 deletions(-)
rename target/arm/arm-semi.c => hw/semihosting/common-semi.c (100%)
rename linux-user/{arm => }/semihost.c (100%)
diff --git a/default-configs/devices/arm-softmmu.mak b/default-configs/devices/arm-softmmu.mak
index 08a32123b4..0500156a0c 100644
--- a/default-configs/devices/arm-softmmu.mak
+++ b/default-configs/devices/arm-softmmu.mak
@@ -42,4 +42,5 @@ CONFIG_FSL_IMX25=y
CONFIG_FSL_IMX7=y
CONFIG_FSL_IMX6UL=y
CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
CONFIG_ALLWINNER_H3=y
diff --git a/default-configs/targets/aarch64-linux-user.mak b/default-configs/targets/aarch64-linux-user.mak
index 163c9209f4..4713253709 100644
--- a/default-configs/targets/aarch64-linux-user.mak
+++ b/default-configs/targets/aarch64-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=aarch64
TARGET_BASE_ARCH=arm
TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml
TARGET_HAS_BFLT=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/default-configs/targets/arm-linux-user.mak b/default-configs/targets/arm-linux-user.mak
index c7cd872e86..e741ffd4d3 100644
--- a/default-configs/targets/arm-linux-user.mak
+++ b/default-configs/targets/arm-linux-user.mak
@@ -3,3 +3,4 @@ TARGET_SYSTBL_ABI=common,oabi
TARGET_SYSTBL=syscall.tbl
TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml
TARGET_HAS_BFLT=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/hw/semihosting/Kconfig b/hw/semihosting/Kconfig
index efe0a30734..4c30dc6b16 100644
--- a/hw/semihosting/Kconfig
+++ b/hw/semihosting/Kconfig
@@ -1,3 +1,6 @@
config SEMIHOSTING
bool
+
+config ARM_COMPATIBLE_SEMIHOSTING
+ bool
diff --git a/target/arm/arm-semi.c b/hw/semihosting/common-semi.c
similarity index 100%
rename from target/arm/arm-semi.c
rename to hw/semihosting/common-semi.c
diff --git a/hw/semihosting/meson.build b/hw/semihosting/meson.build
index f40ac574c4..5b4a170270 100644
--- a/hw/semihosting/meson.build
+++ b/hw/semihosting/meson.build
@@ -2,3 +2,6 @@ specific_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files(
'config.c',
'console.c',
))
+
+specific_ss.add(when: ['CONFIG_ARM_COMPATIBLE_SEMIHOSTING'],
+ if_true: files('common-semi.c'))
diff --git a/linux-user/arm/meson.build b/linux-user/arm/meson.build
index 432984b58e..5a93c925cf 100644
--- a/linux-user/arm/meson.build
+++ b/linux-user/arm/meson.build
@@ -1,6 +1,3 @@
-linux_user_ss.add(when: 'TARGET_AARCH64', if_true: files('semihost.c'))
-linux_user_ss.add(when: 'TARGET_ARM', if_true: files('semihost.c'))
-
subdir('nwfpe')
syscall_nr_generators += {
diff --git a/linux-user/meson.build b/linux-user/meson.build
index 2b94e4ba24..7fe28d659e 100644
--- a/linux-user/meson.build
+++ b/linux-user/meson.build
@@ -16,6 +16,7 @@ linux_user_ss.add(rt)
linux_user_ss.add(when: 'TARGET_HAS_BFLT', if_true: files('flatload.c'))
linux_user_ss.add(when: 'TARGET_I386', if_true: files('vm86.c'))
+linux_user_ss.add(when: 'CONFIG_ARM_COMPATIBLE_SEMIHOSTING', if_true: files('semihost.c'))
syscall_nr_generators = {}
diff --git a/linux-user/arm/semihost.c b/linux-user/semihost.c
similarity index 100%
rename from linux-user/arm/semihost.c
rename to linux-user/semihost.c
diff --git a/target/arm/meson.build b/target/arm/meson.build
index f5de2a77b8..15b936c101 100644
--- a/target/arm/meson.build
+++ b/target/arm/meson.build
@@ -32,8 +32,6 @@ arm_ss.add(files(
))
arm_ss.add(zlib)
-arm_ss.add(when: 'CONFIG_TCG', if_true: files('arm-semi.c'))
-
arm_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c', 'kvm64.c'), if_false: files('kvm-stub.c'))
arm_ss.add(when: 'TARGET_AARCH64', if_true: files(
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 2/8] semihosting: Change common-semi API to be architecture-independent
2020-11-25 21:36 ` Keith Packard
@ 2020-11-25 21:36 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard, Alistair Francis
The public API is now defined in
hw/semihosting/common-semi.h. do_common_semihosting takes CPUState *
instead of CPUARMState *. All internal functions have been renamed
common_semi_ instead of arm_semi_ or arm_. Aside from the API change,
there are no functional changes in this patch.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
hw/semihosting/common-semi.c | 16 ++++++++++------
hw/semihosting/common-semi.h | 36 +++++++++++++++++++++++++++++++++++
linux-user/aarch64/cpu_loop.c | 3 ++-
linux-user/arm/cpu_loop.c | 3 ++-
target/arm/cpu.h | 8 --------
target/arm/helper.c | 5 +++--
target/arm/m_helper.c | 7 ++++++-
7 files changed, 59 insertions(+), 19 deletions(-)
create mode 100644 hw/semihosting/common-semi.h
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index c892e0e674..cafbe579c7 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -1,10 +1,14 @@
/*
- * Arm "Angel" semihosting syscalls
+ * Semihosting support for systems modeled on the Arm "Angel"
+ * semihosting syscalls design.
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
* Written by Paul Brook.
*
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ * Adapted for systems other than ARM, including RISC-V, by Keith Packard
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
@@ -372,12 +376,12 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* do anything with its return value, because it is not necessarily
* the result of the syscall, but could just be the old value of X0.
* The only thing safe to do with this is that the callers of
- * do_arm_semihosting() will write it straight back into X0.
+ * do_common_semihosting() will write it straight back into X0.
* (In linux-user mode, the callback will have happened before
* gdb_do_syscallv() returns.)
*
* We should tidy this up so neither this function nor
- * do_arm_semihosting() return a value, so the mistake of
+ * do_common_semihosting() return a value, so the mistake of
* doing something with the return value is not possible to make.
*/
@@ -674,10 +678,10 @@ static const GuestFDFunctions guestfd_fns[] = {
* leave the register unchanged. We use 0xdeadbeef as the return value
* when there isn't a defined return value for the call.
*/
-target_ulong do_arm_semihosting(CPUARMState *env)
+target_ulong do_common_semihosting(CPUState *cs)
{
- ARMCPU *cpu = env_archcpu(env);
- CPUState *cs = env_cpu(env);
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
char * s;
diff --git a/hw/semihosting/common-semi.h b/hw/semihosting/common-semi.h
new file mode 100644
index 0000000000..bc53e92c79
--- /dev/null
+++ b/hw/semihosting/common-semi.h
@@ -0,0 +1,36 @@
+/*
+ * Semihosting support for systems modeled on the Arm "Angel"
+ * semihosting syscalls design.
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019 Linaro
+ * Written by Paul Brook.
+ *
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ * Adapted for systems other than ARM, including RISC-V, by Keith Packard
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * ARM Semihosting is documented in:
+ * Semihosting for AArch32 and AArch64 Release 2.0
+ * https://static.docs.arm.com/100863/0200/semihosting.pdf
+ *
+ */
+
+#ifndef COMMON_SEMI_H
+#define COMMON_SEMI_H
+
+target_ulong do_common_semihosting(CPUState *cs);
+
+#endif /* COMMON_SEMI_H */
diff --git a/linux-user/aarch64/cpu_loop.c b/linux-user/aarch64/cpu_loop.c
index bbe9fefca8..42b9c15f53 100644
--- a/linux-user/aarch64/cpu_loop.c
+++ b/linux-user/aarch64/cpu_loop.c
@@ -22,6 +22,7 @@
#include "qemu.h"
#include "cpu_loop-common.h"
#include "qemu/guest-random.h"
+#include "hw/semihosting/common-semi.h"
#define get_user_code_u32(x, gaddr, env) \
({ abi_long __r = get_user_u32((x), (gaddr)); \
@@ -129,7 +130,7 @@ void cpu_loop(CPUARMState *env)
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_SEMIHOST:
- env->xregs[0] = do_arm_semihosting(env);
+ env->xregs[0] = do_common_semihosting(cs);
env->pc += 4;
break;
case EXCP_YIELD:
diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c
index 3d272b56ef..cadfb7fa43 100644
--- a/linux-user/arm/cpu_loop.c
+++ b/linux-user/arm/cpu_loop.c
@@ -22,6 +22,7 @@
#include "qemu.h"
#include "elf.h"
#include "cpu_loop-common.h"
+#include "hw/semihosting/common-semi.h"
#define get_user_code_u32(x, gaddr, env) \
({ abi_long __r = get_user_u32((x), (gaddr)); \
@@ -421,7 +422,7 @@ void cpu_loop(CPUARMState *env)
}
break;
case EXCP_SEMIHOST:
- env->regs[0] = do_arm_semihosting(env);
+ env->regs[0] = do_common_semihosting(cs);
env->regs[15] += env->thumb ? 2 : 4;
break;
case EXCP_INTERRUPT:
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index e5514c8286..55f3b7d3e1 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -1068,14 +1068,6 @@ static inline void aarch64_sve_change_el(CPUARMState *env, int o,
static inline void aarch64_add_sve_properties(Object *obj) { }
#endif
-#if !defined(CONFIG_TCG)
-static inline target_ulong do_arm_semihosting(CPUARMState *env)
-{
- g_assert_not_reached();
-}
-#else
-target_ulong do_arm_semihosting(CPUARMState *env);
-#endif
void aarch64_sync_32_to_64(CPUARMState *env);
void aarch64_sync_64_to_32(CPUARMState *env);
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 38cd35c049..a5e94f1e33 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -34,6 +34,7 @@
#ifdef CONFIG_TCG
#include "arm_ldst.h"
#include "exec/cpu_ldst.h"
+#include "hw/semihosting/common-semi.h"
#endif
#define ARM_CPU_FREQ 1000000000 /* FIXME: 1 GHz, should be configurable */
@@ -9879,13 +9880,13 @@ static void handle_semihosting(CPUState *cs)
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%" PRIx64 "\n",
env->xregs[0]);
- env->xregs[0] = do_arm_semihosting(env);
+ env->xregs[0] = do_common_semihosting(cs);
env->pc += 4;
} else {
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%x\n",
env->regs[0]);
- env->regs[0] = do_arm_semihosting(env);
+ env->regs[0] = do_common_semihosting(cs);
env->regs[15] += env->thumb ? 2 : 4;
}
}
diff --git a/target/arm/m_helper.c b/target/arm/m_helper.c
index aad01ea012..610ca032a7 100644
--- a/target/arm/m_helper.c
+++ b/target/arm/m_helper.c
@@ -31,6 +31,7 @@
#ifdef CONFIG_TCG
#include "arm_ldst.h"
#include "exec/cpu_ldst.h"
+#include "hw/semihosting/common-semi.h"
#endif
static void v7m_msr_xpsr(CPUARMState *env, uint32_t mask,
@@ -2188,7 +2189,11 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%x\n",
env->regs[0]);
- env->regs[0] = do_arm_semihosting(env);
+#ifdef CONFIG_TCG
+ env->regs[0] = do_common_semihosting(cs);
+#else
+ g_assert_not_reached();
+#endif
env->regs[15] += env->thumb ? 2 : 4;
return;
case EXCP_BKPT:
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 2/8] semihosting: Change common-semi API to be architecture-independent
@ 2020-11-25 21:36 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard, Alistair Francis
The public API is now defined in
hw/semihosting/common-semi.h. do_common_semihosting takes CPUState *
instead of CPUARMState *. All internal functions have been renamed
common_semi_ instead of arm_semi_ or arm_. Aside from the API change,
there are no functional changes in this patch.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
hw/semihosting/common-semi.c | 16 ++++++++++------
hw/semihosting/common-semi.h | 36 +++++++++++++++++++++++++++++++++++
linux-user/aarch64/cpu_loop.c | 3 ++-
linux-user/arm/cpu_loop.c | 3 ++-
target/arm/cpu.h | 8 --------
target/arm/helper.c | 5 +++--
target/arm/m_helper.c | 7 ++++++-
7 files changed, 59 insertions(+), 19 deletions(-)
create mode 100644 hw/semihosting/common-semi.h
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index c892e0e674..cafbe579c7 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -1,10 +1,14 @@
/*
- * Arm "Angel" semihosting syscalls
+ * Semihosting support for systems modeled on the Arm "Angel"
+ * semihosting syscalls design.
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
* Written by Paul Brook.
*
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ * Adapted for systems other than ARM, including RISC-V, by Keith Packard
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
@@ -372,12 +376,12 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* do anything with its return value, because it is not necessarily
* the result of the syscall, but could just be the old value of X0.
* The only thing safe to do with this is that the callers of
- * do_arm_semihosting() will write it straight back into X0.
+ * do_common_semihosting() will write it straight back into X0.
* (In linux-user mode, the callback will have happened before
* gdb_do_syscallv() returns.)
*
* We should tidy this up so neither this function nor
- * do_arm_semihosting() return a value, so the mistake of
+ * do_common_semihosting() return a value, so the mistake of
* doing something with the return value is not possible to make.
*/
@@ -674,10 +678,10 @@ static const GuestFDFunctions guestfd_fns[] = {
* leave the register unchanged. We use 0xdeadbeef as the return value
* when there isn't a defined return value for the call.
*/
-target_ulong do_arm_semihosting(CPUARMState *env)
+target_ulong do_common_semihosting(CPUState *cs)
{
- ARMCPU *cpu = env_archcpu(env);
- CPUState *cs = env_cpu(env);
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
char * s;
diff --git a/hw/semihosting/common-semi.h b/hw/semihosting/common-semi.h
new file mode 100644
index 0000000000..bc53e92c79
--- /dev/null
+++ b/hw/semihosting/common-semi.h
@@ -0,0 +1,36 @@
+/*
+ * Semihosting support for systems modeled on the Arm "Angel"
+ * semihosting syscalls design.
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019 Linaro
+ * Written by Paul Brook.
+ *
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ * Adapted for systems other than ARM, including RISC-V, by Keith Packard
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * ARM Semihosting is documented in:
+ * Semihosting for AArch32 and AArch64 Release 2.0
+ * https://static.docs.arm.com/100863/0200/semihosting.pdf
+ *
+ */
+
+#ifndef COMMON_SEMI_H
+#define COMMON_SEMI_H
+
+target_ulong do_common_semihosting(CPUState *cs);
+
+#endif /* COMMON_SEMI_H */
diff --git a/linux-user/aarch64/cpu_loop.c b/linux-user/aarch64/cpu_loop.c
index bbe9fefca8..42b9c15f53 100644
--- a/linux-user/aarch64/cpu_loop.c
+++ b/linux-user/aarch64/cpu_loop.c
@@ -22,6 +22,7 @@
#include "qemu.h"
#include "cpu_loop-common.h"
#include "qemu/guest-random.h"
+#include "hw/semihosting/common-semi.h"
#define get_user_code_u32(x, gaddr, env) \
({ abi_long __r = get_user_u32((x), (gaddr)); \
@@ -129,7 +130,7 @@ void cpu_loop(CPUARMState *env)
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_SEMIHOST:
- env->xregs[0] = do_arm_semihosting(env);
+ env->xregs[0] = do_common_semihosting(cs);
env->pc += 4;
break;
case EXCP_YIELD:
diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c
index 3d272b56ef..cadfb7fa43 100644
--- a/linux-user/arm/cpu_loop.c
+++ b/linux-user/arm/cpu_loop.c
@@ -22,6 +22,7 @@
#include "qemu.h"
#include "elf.h"
#include "cpu_loop-common.h"
+#include "hw/semihosting/common-semi.h"
#define get_user_code_u32(x, gaddr, env) \
({ abi_long __r = get_user_u32((x), (gaddr)); \
@@ -421,7 +422,7 @@ void cpu_loop(CPUARMState *env)
}
break;
case EXCP_SEMIHOST:
- env->regs[0] = do_arm_semihosting(env);
+ env->regs[0] = do_common_semihosting(cs);
env->regs[15] += env->thumb ? 2 : 4;
break;
case EXCP_INTERRUPT:
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index e5514c8286..55f3b7d3e1 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -1068,14 +1068,6 @@ static inline void aarch64_sve_change_el(CPUARMState *env, int o,
static inline void aarch64_add_sve_properties(Object *obj) { }
#endif
-#if !defined(CONFIG_TCG)
-static inline target_ulong do_arm_semihosting(CPUARMState *env)
-{
- g_assert_not_reached();
-}
-#else
-target_ulong do_arm_semihosting(CPUARMState *env);
-#endif
void aarch64_sync_32_to_64(CPUARMState *env);
void aarch64_sync_64_to_32(CPUARMState *env);
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 38cd35c049..a5e94f1e33 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -34,6 +34,7 @@
#ifdef CONFIG_TCG
#include "arm_ldst.h"
#include "exec/cpu_ldst.h"
+#include "hw/semihosting/common-semi.h"
#endif
#define ARM_CPU_FREQ 1000000000 /* FIXME: 1 GHz, should be configurable */
@@ -9879,13 +9880,13 @@ static void handle_semihosting(CPUState *cs)
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%" PRIx64 "\n",
env->xregs[0]);
- env->xregs[0] = do_arm_semihosting(env);
+ env->xregs[0] = do_common_semihosting(cs);
env->pc += 4;
} else {
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%x\n",
env->regs[0]);
- env->regs[0] = do_arm_semihosting(env);
+ env->regs[0] = do_common_semihosting(cs);
env->regs[15] += env->thumb ? 2 : 4;
}
}
diff --git a/target/arm/m_helper.c b/target/arm/m_helper.c
index aad01ea012..610ca032a7 100644
--- a/target/arm/m_helper.c
+++ b/target/arm/m_helper.c
@@ -31,6 +31,7 @@
#ifdef CONFIG_TCG
#include "arm_ldst.h"
#include "exec/cpu_ldst.h"
+#include "hw/semihosting/common-semi.h"
#endif
static void v7m_msr_xpsr(CPUARMState *env, uint32_t mask,
@@ -2188,7 +2189,11 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%x\n",
env->regs[0]);
- env->regs[0] = do_arm_semihosting(env);
+#ifdef CONFIG_TCG
+ env->regs[0] = do_common_semihosting(cs);
+#else
+ g_assert_not_reached();
+#endif
env->regs[15] += env->thumb ? 2 : 4;
return;
case EXCP_BKPT:
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 3/8] semihosting: Change internal common-semi interfaces to use CPUState * [v2]
2020-11-25 21:36 ` Keith Packard
@ 2020-11-25 21:36 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard, Alistair Francis
This makes all of the internal interfaces architecture-independent and
renames the internal functions to use the 'common_semi' prefix instead
of 'arm' or 'arm_semi'.
To do this, some new architecture-specific internal helper functions
were created:
static inline target_ulong
common_semi_arg(CPUState *cs, int argno)
Returns the argno'th semihosting argument, where argno can be
either 0 or 1.
static inline void
common_semi_set_ret(CPUState *cs, target_ulong ret)
Sets the semihosting return value.
static inline bool
common_semi_sys_exit_extended(CPUState *cs, int nr)
This detects whether the specified semihosting call, which
is either TARGET_SYS_EXIT or TARGET_SYS_EXIT_EXTENDED should
be executed using the TARGET_SYS_EXIT_EXTENDED semantics.
static inline target_ulong
common_semi_rambase(CPUState *cs)
Returns the base of RAM region used for heap and stack. This
is used to construct plausible values for the SYS_HEAPINFO
call.
In addition, several existing functions have been changed to flag
areas of code which are architecture specific:
static target_ulong
common_semi_flen_buf(CPUState *cs)
Returns the current stack pointer minus 64, which is
where a stat structure will be placed on the stack
#define GET_ARG(n)
This fetches arguments from the semihosting command's argument
block. The address of this is available implicitly through the
local 'args' variable. This is *mostly* architecture
independent, but does depend on the current ABI's notion of
the size of a 'long' parameter, which may need run-time checks
(as it does on AARCH64)
#define SET_ARG(n, val)
This mirrors GET_ARG and stores data back into the argument
block.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
----
v2:
Add common_semi_rambase hook to get memory address for
SYS_HEAPINFO call.
---
hw/semihosting/common-semi.c | 350 ++++++++++++++++++-----------------
1 file changed, 185 insertions(+), 165 deletions(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index cafbe579c7..27bdfd0e83 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -32,15 +32,15 @@
#include "cpu.h"
#include "hw/semihosting/semihost.h"
#include "hw/semihosting/console.h"
+#include "hw/semihosting/common-semi.h"
#include "qemu/log.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
-#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
+#define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "exec/gdbstub.h"
#include "qemu/cutils.h"
-#include "hw/arm/boot.h"
#endif
#define TARGET_SYS_OPEN 0x01
@@ -133,6 +133,50 @@ typedef struct GuestFD {
static GArray *guestfd_array;
+#ifdef TARGET_ARM
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ return env->xregs[argno];
+ } else {
+ return env->regs[argno];
+ }
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ env->xregs[0] = ret;
+ } else {
+ env->regs[0] = ret;
+ }
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
+}
+
+#ifndef CONFIG_USER_ONLY
+#include "hw/arm/boot.h"
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+ CPUArchState *env = cs->env_ptr;
+ const struct arm_boot_info *info = env->boot_info;
+ return info->loader_start;
+}
+#endif
+
+#endif /* TARGET_ARM */
+
/*
* Allocate a new guest file descriptor and return it; if we
* couldn't allocate a new fd then return -1.
@@ -238,11 +282,10 @@ static target_ulong syscall_err;
#include "exec/softmmu-semi.h"
#endif
-static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
+static inline uint32_t set_swi_errno(CPUState *cs, uint32_t code)
{
if (code == (uint32_t)-1) {
#ifdef CONFIG_USER_ONLY
- CPUState *cs = env_cpu(env);
TaskState *ts = cs->opaque;
ts->swi_errno = errno;
@@ -253,10 +296,9 @@ static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
return code;
}
-static inline uint32_t get_swi_errno(CPUARMState *env)
+static inline uint32_t get_swi_errno(CPUState *cs)
{
#ifdef CONFIG_USER_ONLY
- CPUState *cs = env_cpu(env);
TaskState *ts = cs->opaque;
return ts->swi_errno;
@@ -265,24 +307,22 @@ static inline uint32_t get_swi_errno(CPUARMState *env)
#endif
}
-static target_ulong arm_semi_syscall_len;
+static target_ulong common_semi_syscall_len;
-static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- target_ulong reg0 = is_a64(env) ? env->xregs[0] : env->regs[0];
+ target_ulong reg0 = common_semi_arg(cs, 0);
if (ret == (target_ulong)-1) {
errno = err;
- set_swi_errno(env, -1);
+ set_swi_errno(cs, -1);
reg0 = ret;
} else {
/* Fixup syscalls that use nonstardard return conventions. */
switch (reg0) {
case TARGET_SYS_WRITE:
case TARGET_SYS_READ:
- reg0 = arm_semi_syscall_len - ret;
+ reg0 = common_semi_syscall_len - ret;
break;
case TARGET_SYS_SEEK:
reg0 = 0;
@@ -292,77 +332,66 @@ static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
break;
}
}
- if (is_a64(env)) {
- env->xregs[0] = reg0;
- } else {
- env->regs[0] = reg0;
- }
+ common_semi_set_ret(cs, reg0);
}
-static target_ulong arm_flen_buf(ARMCPU *cpu)
+static target_ulong common_semi_flen_buf(CPUState *cs)
{
+ target_ulong sp;
+#ifdef TARGET_ARM
/* Return an address in target memory of 64 bytes where the remote
* gdb should write its stat struct. (The format of this structure
* is defined by GDB's remote protocol and is not target-specific.)
* We put this on the guest's stack just below SP.
*/
+ ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
- target_ulong sp;
if (is_a64(env)) {
sp = env->xregs[31];
} else {
sp = env->regs[13];
}
+#endif
return sp - 64;
}
-static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void
+common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
/* The size is always stored in big-endian order, extract
the value. We assume the size always fit in 32 bits. */
uint32_t size;
- cpu_memory_rw_debug(cs, arm_flen_buf(cpu) + 32, (uint8_t *)&size, 4, 0);
+ cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) + 32,
+ (uint8_t *)&size, 4, 0);
size = be32_to_cpu(size);
- if (is_a64(env)) {
- env->xregs[0] = size;
- } else {
- env->regs[0] = size;
- }
+ common_semi_set_ret(cs, size);
errno = err;
- set_swi_errno(env, -1);
+ set_swi_errno(cs, -1);
}
-static int arm_semi_open_guestfd;
+static int common_semi_open_guestfd;
-static void arm_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void
+common_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
if (ret == (target_ulong)-1) {
errno = err;
- set_swi_errno(env, -1);
- dealloc_guestfd(arm_semi_open_guestfd);
+ set_swi_errno(cs, -1);
+ dealloc_guestfd(common_semi_open_guestfd);
} else {
- associate_guestfd(arm_semi_open_guestfd, ret);
- ret = arm_semi_open_guestfd;
- }
-
- if (is_a64(env)) {
- env->xregs[0] = ret;
- } else {
- env->regs[0] = ret;
+ associate_guestfd(common_semi_open_guestfd, ret);
+ ret = common_semi_open_guestfd;
}
+ common_semi_set_ret(cs, ret);
}
-static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
- const char *fmt, ...)
+static target_ulong
+common_semi_gdb_syscall(CPUState *cs, gdb_syscall_complete_cb cb,
+ const char *fmt, ...)
{
va_list va;
- CPUARMState *env = &cpu->env;
va_start(va, fmt);
gdb_do_syscallv(cb, fmt, va);
@@ -385,7 +414,7 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* doing something with the return value is not possible to make.
*/
- return is_a64(env) ? env->xregs[0] : env->regs[0];
+ return common_semi_arg(cs, 0);
}
/*
@@ -394,20 +423,18 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* do the work and return the required return value for the guest,
* setting the guest errno if appropriate.
*/
-typedef uint32_t sys_closefn(ARMCPU *cpu, GuestFD *gf);
-typedef uint32_t sys_writefn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_closefn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len);
-typedef uint32_t sys_readfn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len);
-typedef uint32_t sys_isattyfn(ARMCPU *cpu, GuestFD *gf);
-typedef uint32_t sys_seekfn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_isattyfn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_seekfn(CPUState *cs, GuestFD *gf,
target_ulong offset);
-typedef uint32_t sys_flenfn(ARMCPU *cpu, GuestFD *gf);
+typedef uint32_t sys_flenfn(CPUState *cs, GuestFD *gf);
-static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_closefn(CPUState *cs, GuestFD *gf)
{
- CPUARMState *env = &cpu->env;
-
/*
* Only close the underlying host fd if it's one we opened on behalf
* of the guest in SYS_OPEN.
@@ -417,20 +444,21 @@ static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
gf->hostfd == STDERR_FILENO) {
return 0;
}
- return set_swi_errno(env, close(gf->hostfd));
+ return set_swi_errno(cs, close(gf->hostfd));
}
-static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t host_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t ret;
- CPUARMState *env = &cpu->env;
char *s = lock_user(VERIFY_READ, buf, len, 1);
+ (void) env; /* Used in arm softmmu lock_user implicitly */
if (!s) {
/* Return bytes not written on error */
return len;
}
- ret = set_swi_errno(env, write(gf->hostfd, s, len));
+ ret = set_swi_errno(cs, write(gf->hostfd, s, len));
unlock_user(s, buf, 0);
if (ret == (uint32_t)-1) {
ret = 0;
@@ -439,18 +467,19 @@ static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf,
return len - ret;
}
-static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t host_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t ret;
- CPUARMState *env = &cpu->env;
char *s = lock_user(VERIFY_WRITE, buf, len, 0);
+ (void) env; /* Used in arm softmmu lock_user implicitly */
if (!s) {
/* return bytes not read */
return len;
}
do {
- ret = set_swi_errno(env, read(gf->hostfd, s, len));
+ ret = set_swi_errno(cs, read(gf->hostfd, s, len));
} while (ret == -1 && errno == EINTR);
unlock_user(s, buf, len);
if (ret == (uint32_t)-1) {
@@ -460,68 +489,66 @@ static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf,
return len - ret;
}
-static uint32_t host_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_isattyfn(CPUState *cs, GuestFD *gf)
{
return isatty(gf->hostfd);
}
-static uint32_t host_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
+static uint32_t host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
- CPUARMState *env = &cpu->env;
- uint32_t ret = set_swi_errno(env, lseek(gf->hostfd, offset, SEEK_SET));
+ uint32_t ret = set_swi_errno(cs, lseek(gf->hostfd, offset, SEEK_SET));
if (ret == (uint32_t)-1) {
return -1;
}
return 0;
}
-static uint32_t host_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_flenfn(CPUState *cs, GuestFD *gf)
{
- CPUARMState *env = &cpu->env;
struct stat buf;
- uint32_t ret = set_swi_errno(env, fstat(gf->hostfd, &buf));
+ uint32_t ret = set_swi_errno(cs, fstat(gf->hostfd, &buf));
if (ret == (uint32_t)-1) {
return -1;
}
return buf.st_size;
}
-static uint32_t gdb_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_closefn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", gf->hostfd);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "close,%x", gf->hostfd);
}
-static uint32_t gdb_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t gdb_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
- arm_semi_syscall_len = len;
- return arm_gdb_syscall(cpu, arm_semi_cb, "write,%x,%x,%x",
- gf->hostfd, buf, len);
+ common_semi_syscall_len = len;
+ return common_semi_gdb_syscall(cs, common_semi_cb, "write,%x,%x,%x",
+ gf->hostfd, buf, len);
}
-static uint32_t gdb_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t gdb_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
- arm_semi_syscall_len = len;
- return arm_gdb_syscall(cpu, arm_semi_cb, "read,%x,%x,%x",
- gf->hostfd, buf, len);
+ common_semi_syscall_len = len;
+ return common_semi_gdb_syscall(cs, common_semi_cb, "read,%x,%x,%x",
+ gf->hostfd, buf, len);
}
-static uint32_t gdb_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_isattyfn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "isatty,%x", gf->hostfd);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "isatty,%x", gf->hostfd);
}
-static uint32_t gdb_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
+static uint32_t gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0",
- gf->hostfd, offset);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "lseek,%x,%x,0",
+ gf->hostfd, offset);
}
-static uint32_t gdb_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_flenfn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x",
- gf->hostfd, arm_flen_buf(cpu));
+ return common_semi_gdb_syscall(cs, common_semi_flen_cb, "fstat,%x,%x",
+ gf->hostfd, common_semi_flen_buf(cs));
}
#define SHFB_MAGIC_0 0x53
@@ -550,31 +577,29 @@ static void init_featurefile_guestfd(int guestfd)
gf->featurefile_offset = 0;
}
-static uint32_t featurefile_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_closefn(CPUState *cs, GuestFD *gf)
{
/* Nothing to do */
return 0;
}
-static uint32_t featurefile_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
/* This fd can never be open for writing */
- CPUARMState *env = &cpu->env;
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
-static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t i;
-#ifndef CONFIG_USER_ONLY
- CPUARMState *env = &cpu->env;
-#endif
char *s;
+ (void) env; /* Used in arm softmmu lock_user implicitly */
s = lock_user(VERIFY_WRITE, buf, len, 0);
if (!s) {
return len;
@@ -594,19 +619,19 @@ static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf,
return len - i;
}
-static uint32_t featurefile_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_isattyfn(CPUState *cs, GuestFD *gf)
{
return 0;
}
-static uint32_t featurefile_seekfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_seekfn(CPUState *cs, GuestFD *gf,
target_ulong offset)
{
gf->featurefile_offset = offset;
return 0;
}
-static uint32_t featurefile_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_flenfn(CPUState *cs, GuestFD *gf)
{
return sizeof(featurefile_data);
}
@@ -650,16 +675,17 @@ static const GuestFDFunctions guestfd_fns[] = {
/* Read the input value from the argument block; fail the semihosting
* call if the memory read fails.
*/
+#ifdef TARGET_ARM
#define GET_ARG(n) do { \
if (is_a64(env)) { \
if (get_user_u64(arg ## n, args + (n) * 8)) { \
errno = EFAULT; \
- return set_swi_errno(env, -1); \
+ return set_swi_errno(cs, -1); \
} \
} else { \
if (get_user_u32(arg ## n, args + (n) * 4)) { \
errno = EFAULT; \
- return set_swi_errno(env, -1); \
+ return set_swi_errno(cs, -1); \
} \
} \
} while (0)
@@ -668,6 +694,7 @@ static const GuestFDFunctions guestfd_fns[] = {
(is_a64(env) ? \
put_user_u64(val, args + (n) * 8) : \
put_user_u32(val, args + (n) * 4))
+#endif
/*
* Do a semihosting call.
@@ -680,8 +707,7 @@ static const GuestFDFunctions guestfd_fns[] = {
*/
target_ulong do_common_semihosting(CPUState *cs)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
+ CPUArchState *env = cs->env_ptr;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
char * s;
@@ -690,14 +716,9 @@ target_ulong do_common_semihosting(CPUState *cs)
uint32_t len;
GuestFD *gf;
- if (is_a64(env)) {
- /* Note that the syscall number is in W0, not X0 */
- nr = env->xregs[0] & 0xffffffffU;
- args = env->xregs[1];
- } else {
- nr = env->regs[0];
- args = env->regs[1];
- }
+ (void) env; /* Used implicitly by arm lock_user macro */
+ nr = common_semi_arg(cs, 0) & 0xffffffffU;
+ args = common_semi_arg(cs, 1);
switch (nr) {
case TARGET_SYS_OPEN:
@@ -710,19 +731,19 @@ target_ulong do_common_semihosting(CPUState *cs)
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
if (arg1 >= 12) {
unlock_user(s, arg0, 0);
errno = EINVAL;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
guestfd = alloc_guestfd();
if (guestfd < 0) {
unlock_user(s, arg0, 0);
errno = EMFILE;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
if (strcmp(s, ":tt") == 0) {
@@ -751,18 +772,19 @@ target_ulong do_common_semihosting(CPUState *cs)
if (arg1 != 0 && arg1 != 1) {
dealloc_guestfd(guestfd);
errno = EACCES;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
init_featurefile_guestfd(guestfd);
return guestfd;
}
if (use_gdb_syscalls()) {
- arm_semi_open_guestfd = guestfd;
- ret = arm_gdb_syscall(cpu, arm_semi_open_cb, "open,%s,%x,1a4", arg0,
- (int)arg2 + 1, gdb_open_modeflags[arg1]);
+ common_semi_open_guestfd = guestfd;
+ ret = common_semi_gdb_syscall(cs, common_semi_open_cb,
+ "open,%s,%x,1a4", arg0, (int)arg2 + 1,
+ gdb_open_modeflags[arg1]);
} else {
- ret = set_swi_errno(env, open(s, open_modeflags[arg1], 0644));
+ ret = set_swi_errno(cs, open(s, open_modeflags[arg1], 0644));
if (ret == (uint32_t)-1) {
dealloc_guestfd(guestfd);
} else {
@@ -779,17 +801,17 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = guestfd_fns[gf->type].closefn(cpu, gf);
+ ret = guestfd_fns[gf->type].closefn(cs, gf);
dealloc_guestfd(arg0);
return ret;
case TARGET_SYS_WRITEC:
- qemu_semihosting_console_outc(env, args);
+ qemu_semihosting_console_outc(cs->env_ptr, args);
return 0xdeadbeef;
case TARGET_SYS_WRITE0:
- return qemu_semihosting_console_outs(env, args);
+ return qemu_semihosting_console_outs(cs->env_ptr, args);
case TARGET_SYS_WRITE:
GET_ARG(0);
GET_ARG(1);
@@ -799,10 +821,10 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].writefn(cpu, gf, arg1, len);
+ return guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
case TARGET_SYS_READ:
GET_ARG(0);
GET_ARG(1);
@@ -812,22 +834,22 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].readfn(cpu, gf, arg1, len);
+ return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
case TARGET_SYS_READC:
- return qemu_semihosting_console_inc(env);
+ return qemu_semihosting_console_inc(cs->env_ptr);
case TARGET_SYS_ISTTY:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].isattyfn(cpu, gf);
+ return guestfd_fns[gf->type].isattyfn(cs, gf);
case TARGET_SYS_SEEK:
GET_ARG(0);
GET_ARG(1);
@@ -835,20 +857,20 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].seekfn(cpu, gf, arg1);
+ return guestfd_fns[gf->type].seekfn(cs, gf, arg1);
case TARGET_SYS_FLEN:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].flenfn(cpu, gf);
+ return guestfd_fns[gf->type].flenfn(cs, gf);
case TARGET_SYS_TMPNAM:
qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
return -1;
@@ -856,15 +878,15 @@ target_ulong do_common_semihosting(CPUState *cs)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- ret = arm_gdb_syscall(cpu, arm_semi_cb, "unlink,%s",
- arg0, (int)arg1 + 1);
+ ret = common_semi_gdb_syscall(cs, common_semi_cb, "unlink,%s",
+ arg0, (int)arg1 + 1);
} else {
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = set_swi_errno(env, remove(s));
+ ret = set_swi_errno(cs, remove(s));
unlock_user(s, arg0, 0);
}
return ret;
@@ -874,17 +896,18 @@ target_ulong do_common_semihosting(CPUState *cs)
GET_ARG(2);
GET_ARG(3);
if (use_gdb_syscalls()) {
- return arm_gdb_syscall(cpu, arm_semi_cb, "rename,%s,%s",
- arg0, (int)arg1 + 1, arg2, (int)arg3 + 1);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "rename,%s,%s",
+ arg0, (int)arg1 + 1, arg2,
+ (int)arg3 + 1);
} else {
char *s2;
s = lock_user_string(arg0);
s2 = lock_user_string(arg2);
if (!s || !s2) {
errno = EFAULT;
- ret = set_swi_errno(env, -1);
+ ret = set_swi_errno(cs, -1);
} else {
- ret = set_swi_errno(env, rename(s, s2));
+ ret = set_swi_errno(cs, rename(s, s2));
}
if (s2)
unlock_user(s2, arg2, 0);
@@ -895,25 +918,25 @@ target_ulong do_common_semihosting(CPUState *cs)
case TARGET_SYS_CLOCK:
return clock() / (CLOCKS_PER_SEC / 100);
case TARGET_SYS_TIME:
- return set_swi_errno(env, time(NULL));
+ return set_swi_errno(cs, time(NULL));
case TARGET_SYS_SYSTEM:
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- return arm_gdb_syscall(cpu, arm_semi_cb, "system,%s",
- arg0, (int)arg1 + 1);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "system,%s",
+ arg0, (int)arg1 + 1);
} else {
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = set_swi_errno(env, system(s));
+ ret = set_swi_errno(cs, system(s));
unlock_user(s, arg0, 0);
return ret;
}
case TARGET_SYS_ERRNO:
- return get_swi_errno(env);
+ return get_swi_errno(cs);
case TARGET_SYS_GET_CMDLINE:
{
/* Build a command-line from the original argv.
@@ -965,21 +988,21 @@ target_ulong do_common_semihosting(CPUState *cs)
if (output_size > input_size) {
/* Not enough space to store command-line arguments. */
errno = E2BIG;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Adjust the command-line length. */
if (SET_ARG(1, output_size - 1)) {
/* Couldn't write back to argument block */
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Lock the buffer on the ARM side. */
output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
if (!output_buffer) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Copy the command-line arguments. */
@@ -995,7 +1018,7 @@ target_ulong do_common_semihosting(CPUState *cs)
if (copy_from_user(output_buffer, ts->info->arg_start,
output_size)) {
errno = EFAULT;
- status = set_swi_errno(env, -1);
+ status = set_swi_errno(cs, -1);
goto out;
}
@@ -1020,8 +1043,7 @@ target_ulong do_common_semihosting(CPUState *cs)
#ifdef CONFIG_USER_ONLY
TaskState *ts = cs->opaque;
#else
- const struct arm_boot_info *info = env->boot_info;
- target_ulong rambase = info->loader_start;
+ target_ulong rambase = common_semi_rambase(cs);
#endif
GET_ARG(0);
@@ -1035,7 +1057,7 @@ target_ulong do_common_semihosting(CPUState *cs)
abi_ulong ret;
ts->heap_base = do_brk(0);
- limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
+ limit = ts->heap_base + COMMON_SEMI_HEAP_SIZE;
/* Try a big heap, and reduce the size if that fails. */
for (;;) {
ret = do_brk(limit);
@@ -1063,23 +1085,19 @@ target_ulong do_common_semihosting(CPUState *cs)
for (i = 0; i < ARRAY_SIZE(retvals); i++) {
bool fail;
- if (is_a64(env)) {
- fail = put_user_u64(retvals[i], arg0 + i * 8);
- } else {
- fail = put_user_u32(retvals[i], arg0 + i * 4);
- }
+ fail = SET_ARG(i, retvals[i]);
if (fail) {
/* Couldn't write back to argument block */
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
}
return 0;
}
case TARGET_SYS_EXIT:
case TARGET_SYS_EXIT_EXTENDED:
- if (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(env)) {
+ if (common_semi_sys_exit_extended(cs, nr)) {
/*
* The A64 version of SYS_EXIT takes a parameter block,
* so the application-exit type can return a subcode which
@@ -1104,7 +1122,7 @@ target_ulong do_common_semihosting(CPUState *cs)
*/
ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
}
- gdb_exit(env, ret);
+ gdb_exit(cs->env_ptr, ret);
exit(ret);
case TARGET_SYS_SYNCCACHE:
/*
@@ -1112,9 +1130,11 @@ target_ulong do_common_semihosting(CPUState *cs)
* virtual address range. This is a nop for us since we don't
* implement caches. This is only present on A64.
*/
- if (is_a64(env)) {
+#ifdef TARGET_ARM
+ if (is_a64(cs->env_ptr)) {
return 0;
}
+#endif
/* fall through -- invalid for A32/T32 */
default:
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 3/8] semihosting: Change internal common-semi interfaces to use CPUState * [v2]
@ 2020-11-25 21:36 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard, Alistair Francis
This makes all of the internal interfaces architecture-independent and
renames the internal functions to use the 'common_semi' prefix instead
of 'arm' or 'arm_semi'.
To do this, some new architecture-specific internal helper functions
were created:
static inline target_ulong
common_semi_arg(CPUState *cs, int argno)
Returns the argno'th semihosting argument, where argno can be
either 0 or 1.
static inline void
common_semi_set_ret(CPUState *cs, target_ulong ret)
Sets the semihosting return value.
static inline bool
common_semi_sys_exit_extended(CPUState *cs, int nr)
This detects whether the specified semihosting call, which
is either TARGET_SYS_EXIT or TARGET_SYS_EXIT_EXTENDED should
be executed using the TARGET_SYS_EXIT_EXTENDED semantics.
static inline target_ulong
common_semi_rambase(CPUState *cs)
Returns the base of RAM region used for heap and stack. This
is used to construct plausible values for the SYS_HEAPINFO
call.
In addition, several existing functions have been changed to flag
areas of code which are architecture specific:
static target_ulong
common_semi_flen_buf(CPUState *cs)
Returns the current stack pointer minus 64, which is
where a stat structure will be placed on the stack
#define GET_ARG(n)
This fetches arguments from the semihosting command's argument
block. The address of this is available implicitly through the
local 'args' variable. This is *mostly* architecture
independent, but does depend on the current ABI's notion of
the size of a 'long' parameter, which may need run-time checks
(as it does on AARCH64)
#define SET_ARG(n, val)
This mirrors GET_ARG and stores data back into the argument
block.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
----
v2:
Add common_semi_rambase hook to get memory address for
SYS_HEAPINFO call.
---
hw/semihosting/common-semi.c | 350 ++++++++++++++++++-----------------
1 file changed, 185 insertions(+), 165 deletions(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index cafbe579c7..27bdfd0e83 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -32,15 +32,15 @@
#include "cpu.h"
#include "hw/semihosting/semihost.h"
#include "hw/semihosting/console.h"
+#include "hw/semihosting/common-semi.h"
#include "qemu/log.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
-#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
+#define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "exec/gdbstub.h"
#include "qemu/cutils.h"
-#include "hw/arm/boot.h"
#endif
#define TARGET_SYS_OPEN 0x01
@@ -133,6 +133,50 @@ typedef struct GuestFD {
static GArray *guestfd_array;
+#ifdef TARGET_ARM
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ return env->xregs[argno];
+ } else {
+ return env->regs[argno];
+ }
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ env->xregs[0] = ret;
+ } else {
+ env->regs[0] = ret;
+ }
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
+}
+
+#ifndef CONFIG_USER_ONLY
+#include "hw/arm/boot.h"
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+ CPUArchState *env = cs->env_ptr;
+ const struct arm_boot_info *info = env->boot_info;
+ return info->loader_start;
+}
+#endif
+
+#endif /* TARGET_ARM */
+
/*
* Allocate a new guest file descriptor and return it; if we
* couldn't allocate a new fd then return -1.
@@ -238,11 +282,10 @@ static target_ulong syscall_err;
#include "exec/softmmu-semi.h"
#endif
-static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
+static inline uint32_t set_swi_errno(CPUState *cs, uint32_t code)
{
if (code == (uint32_t)-1) {
#ifdef CONFIG_USER_ONLY
- CPUState *cs = env_cpu(env);
TaskState *ts = cs->opaque;
ts->swi_errno = errno;
@@ -253,10 +296,9 @@ static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
return code;
}
-static inline uint32_t get_swi_errno(CPUARMState *env)
+static inline uint32_t get_swi_errno(CPUState *cs)
{
#ifdef CONFIG_USER_ONLY
- CPUState *cs = env_cpu(env);
TaskState *ts = cs->opaque;
return ts->swi_errno;
@@ -265,24 +307,22 @@ static inline uint32_t get_swi_errno(CPUARMState *env)
#endif
}
-static target_ulong arm_semi_syscall_len;
+static target_ulong common_semi_syscall_len;
-static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- target_ulong reg0 = is_a64(env) ? env->xregs[0] : env->regs[0];
+ target_ulong reg0 = common_semi_arg(cs, 0);
if (ret == (target_ulong)-1) {
errno = err;
- set_swi_errno(env, -1);
+ set_swi_errno(cs, -1);
reg0 = ret;
} else {
/* Fixup syscalls that use nonstardard return conventions. */
switch (reg0) {
case TARGET_SYS_WRITE:
case TARGET_SYS_READ:
- reg0 = arm_semi_syscall_len - ret;
+ reg0 = common_semi_syscall_len - ret;
break;
case TARGET_SYS_SEEK:
reg0 = 0;
@@ -292,77 +332,66 @@ static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
break;
}
}
- if (is_a64(env)) {
- env->xregs[0] = reg0;
- } else {
- env->regs[0] = reg0;
- }
+ common_semi_set_ret(cs, reg0);
}
-static target_ulong arm_flen_buf(ARMCPU *cpu)
+static target_ulong common_semi_flen_buf(CPUState *cs)
{
+ target_ulong sp;
+#ifdef TARGET_ARM
/* Return an address in target memory of 64 bytes where the remote
* gdb should write its stat struct. (The format of this structure
* is defined by GDB's remote protocol and is not target-specific.)
* We put this on the guest's stack just below SP.
*/
+ ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
- target_ulong sp;
if (is_a64(env)) {
sp = env->xregs[31];
} else {
sp = env->regs[13];
}
+#endif
return sp - 64;
}
-static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void
+common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
/* The size is always stored in big-endian order, extract
the value. We assume the size always fit in 32 bits. */
uint32_t size;
- cpu_memory_rw_debug(cs, arm_flen_buf(cpu) + 32, (uint8_t *)&size, 4, 0);
+ cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) + 32,
+ (uint8_t *)&size, 4, 0);
size = be32_to_cpu(size);
- if (is_a64(env)) {
- env->xregs[0] = size;
- } else {
- env->regs[0] = size;
- }
+ common_semi_set_ret(cs, size);
errno = err;
- set_swi_errno(env, -1);
+ set_swi_errno(cs, -1);
}
-static int arm_semi_open_guestfd;
+static int common_semi_open_guestfd;
-static void arm_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void
+common_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
if (ret == (target_ulong)-1) {
errno = err;
- set_swi_errno(env, -1);
- dealloc_guestfd(arm_semi_open_guestfd);
+ set_swi_errno(cs, -1);
+ dealloc_guestfd(common_semi_open_guestfd);
} else {
- associate_guestfd(arm_semi_open_guestfd, ret);
- ret = arm_semi_open_guestfd;
- }
-
- if (is_a64(env)) {
- env->xregs[0] = ret;
- } else {
- env->regs[0] = ret;
+ associate_guestfd(common_semi_open_guestfd, ret);
+ ret = common_semi_open_guestfd;
}
+ common_semi_set_ret(cs, ret);
}
-static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
- const char *fmt, ...)
+static target_ulong
+common_semi_gdb_syscall(CPUState *cs, gdb_syscall_complete_cb cb,
+ const char *fmt, ...)
{
va_list va;
- CPUARMState *env = &cpu->env;
va_start(va, fmt);
gdb_do_syscallv(cb, fmt, va);
@@ -385,7 +414,7 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* doing something with the return value is not possible to make.
*/
- return is_a64(env) ? env->xregs[0] : env->regs[0];
+ return common_semi_arg(cs, 0);
}
/*
@@ -394,20 +423,18 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* do the work and return the required return value for the guest,
* setting the guest errno if appropriate.
*/
-typedef uint32_t sys_closefn(ARMCPU *cpu, GuestFD *gf);
-typedef uint32_t sys_writefn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_closefn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len);
-typedef uint32_t sys_readfn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len);
-typedef uint32_t sys_isattyfn(ARMCPU *cpu, GuestFD *gf);
-typedef uint32_t sys_seekfn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_isattyfn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_seekfn(CPUState *cs, GuestFD *gf,
target_ulong offset);
-typedef uint32_t sys_flenfn(ARMCPU *cpu, GuestFD *gf);
+typedef uint32_t sys_flenfn(CPUState *cs, GuestFD *gf);
-static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_closefn(CPUState *cs, GuestFD *gf)
{
- CPUARMState *env = &cpu->env;
-
/*
* Only close the underlying host fd if it's one we opened on behalf
* of the guest in SYS_OPEN.
@@ -417,20 +444,21 @@ static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
gf->hostfd == STDERR_FILENO) {
return 0;
}
- return set_swi_errno(env, close(gf->hostfd));
+ return set_swi_errno(cs, close(gf->hostfd));
}
-static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t host_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t ret;
- CPUARMState *env = &cpu->env;
char *s = lock_user(VERIFY_READ, buf, len, 1);
+ (void) env; /* Used in arm softmmu lock_user implicitly */
if (!s) {
/* Return bytes not written on error */
return len;
}
- ret = set_swi_errno(env, write(gf->hostfd, s, len));
+ ret = set_swi_errno(cs, write(gf->hostfd, s, len));
unlock_user(s, buf, 0);
if (ret == (uint32_t)-1) {
ret = 0;
@@ -439,18 +467,19 @@ static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf,
return len - ret;
}
-static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t host_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t ret;
- CPUARMState *env = &cpu->env;
char *s = lock_user(VERIFY_WRITE, buf, len, 0);
+ (void) env; /* Used in arm softmmu lock_user implicitly */
if (!s) {
/* return bytes not read */
return len;
}
do {
- ret = set_swi_errno(env, read(gf->hostfd, s, len));
+ ret = set_swi_errno(cs, read(gf->hostfd, s, len));
} while (ret == -1 && errno == EINTR);
unlock_user(s, buf, len);
if (ret == (uint32_t)-1) {
@@ -460,68 +489,66 @@ static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf,
return len - ret;
}
-static uint32_t host_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_isattyfn(CPUState *cs, GuestFD *gf)
{
return isatty(gf->hostfd);
}
-static uint32_t host_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
+static uint32_t host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
- CPUARMState *env = &cpu->env;
- uint32_t ret = set_swi_errno(env, lseek(gf->hostfd, offset, SEEK_SET));
+ uint32_t ret = set_swi_errno(cs, lseek(gf->hostfd, offset, SEEK_SET));
if (ret == (uint32_t)-1) {
return -1;
}
return 0;
}
-static uint32_t host_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_flenfn(CPUState *cs, GuestFD *gf)
{
- CPUARMState *env = &cpu->env;
struct stat buf;
- uint32_t ret = set_swi_errno(env, fstat(gf->hostfd, &buf));
+ uint32_t ret = set_swi_errno(cs, fstat(gf->hostfd, &buf));
if (ret == (uint32_t)-1) {
return -1;
}
return buf.st_size;
}
-static uint32_t gdb_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_closefn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", gf->hostfd);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "close,%x", gf->hostfd);
}
-static uint32_t gdb_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t gdb_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
- arm_semi_syscall_len = len;
- return arm_gdb_syscall(cpu, arm_semi_cb, "write,%x,%x,%x",
- gf->hostfd, buf, len);
+ common_semi_syscall_len = len;
+ return common_semi_gdb_syscall(cs, common_semi_cb, "write,%x,%x,%x",
+ gf->hostfd, buf, len);
}
-static uint32_t gdb_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t gdb_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
- arm_semi_syscall_len = len;
- return arm_gdb_syscall(cpu, arm_semi_cb, "read,%x,%x,%x",
- gf->hostfd, buf, len);
+ common_semi_syscall_len = len;
+ return common_semi_gdb_syscall(cs, common_semi_cb, "read,%x,%x,%x",
+ gf->hostfd, buf, len);
}
-static uint32_t gdb_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_isattyfn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "isatty,%x", gf->hostfd);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "isatty,%x", gf->hostfd);
}
-static uint32_t gdb_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
+static uint32_t gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0",
- gf->hostfd, offset);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "lseek,%x,%x,0",
+ gf->hostfd, offset);
}
-static uint32_t gdb_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_flenfn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x",
- gf->hostfd, arm_flen_buf(cpu));
+ return common_semi_gdb_syscall(cs, common_semi_flen_cb, "fstat,%x,%x",
+ gf->hostfd, common_semi_flen_buf(cs));
}
#define SHFB_MAGIC_0 0x53
@@ -550,31 +577,29 @@ static void init_featurefile_guestfd(int guestfd)
gf->featurefile_offset = 0;
}
-static uint32_t featurefile_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_closefn(CPUState *cs, GuestFD *gf)
{
/* Nothing to do */
return 0;
}
-static uint32_t featurefile_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
/* This fd can never be open for writing */
- CPUARMState *env = &cpu->env;
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
-static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t i;
-#ifndef CONFIG_USER_ONLY
- CPUARMState *env = &cpu->env;
-#endif
char *s;
+ (void) env; /* Used in arm softmmu lock_user implicitly */
s = lock_user(VERIFY_WRITE, buf, len, 0);
if (!s) {
return len;
@@ -594,19 +619,19 @@ static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf,
return len - i;
}
-static uint32_t featurefile_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_isattyfn(CPUState *cs, GuestFD *gf)
{
return 0;
}
-static uint32_t featurefile_seekfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_seekfn(CPUState *cs, GuestFD *gf,
target_ulong offset)
{
gf->featurefile_offset = offset;
return 0;
}
-static uint32_t featurefile_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_flenfn(CPUState *cs, GuestFD *gf)
{
return sizeof(featurefile_data);
}
@@ -650,16 +675,17 @@ static const GuestFDFunctions guestfd_fns[] = {
/* Read the input value from the argument block; fail the semihosting
* call if the memory read fails.
*/
+#ifdef TARGET_ARM
#define GET_ARG(n) do { \
if (is_a64(env)) { \
if (get_user_u64(arg ## n, args + (n) * 8)) { \
errno = EFAULT; \
- return set_swi_errno(env, -1); \
+ return set_swi_errno(cs, -1); \
} \
} else { \
if (get_user_u32(arg ## n, args + (n) * 4)) { \
errno = EFAULT; \
- return set_swi_errno(env, -1); \
+ return set_swi_errno(cs, -1); \
} \
} \
} while (0)
@@ -668,6 +694,7 @@ static const GuestFDFunctions guestfd_fns[] = {
(is_a64(env) ? \
put_user_u64(val, args + (n) * 8) : \
put_user_u32(val, args + (n) * 4))
+#endif
/*
* Do a semihosting call.
@@ -680,8 +707,7 @@ static const GuestFDFunctions guestfd_fns[] = {
*/
target_ulong do_common_semihosting(CPUState *cs)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
+ CPUArchState *env = cs->env_ptr;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
char * s;
@@ -690,14 +716,9 @@ target_ulong do_common_semihosting(CPUState *cs)
uint32_t len;
GuestFD *gf;
- if (is_a64(env)) {
- /* Note that the syscall number is in W0, not X0 */
- nr = env->xregs[0] & 0xffffffffU;
- args = env->xregs[1];
- } else {
- nr = env->regs[0];
- args = env->regs[1];
- }
+ (void) env; /* Used implicitly by arm lock_user macro */
+ nr = common_semi_arg(cs, 0) & 0xffffffffU;
+ args = common_semi_arg(cs, 1);
switch (nr) {
case TARGET_SYS_OPEN:
@@ -710,19 +731,19 @@ target_ulong do_common_semihosting(CPUState *cs)
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
if (arg1 >= 12) {
unlock_user(s, arg0, 0);
errno = EINVAL;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
guestfd = alloc_guestfd();
if (guestfd < 0) {
unlock_user(s, arg0, 0);
errno = EMFILE;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
if (strcmp(s, ":tt") == 0) {
@@ -751,18 +772,19 @@ target_ulong do_common_semihosting(CPUState *cs)
if (arg1 != 0 && arg1 != 1) {
dealloc_guestfd(guestfd);
errno = EACCES;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
init_featurefile_guestfd(guestfd);
return guestfd;
}
if (use_gdb_syscalls()) {
- arm_semi_open_guestfd = guestfd;
- ret = arm_gdb_syscall(cpu, arm_semi_open_cb, "open,%s,%x,1a4", arg0,
- (int)arg2 + 1, gdb_open_modeflags[arg1]);
+ common_semi_open_guestfd = guestfd;
+ ret = common_semi_gdb_syscall(cs, common_semi_open_cb,
+ "open,%s,%x,1a4", arg0, (int)arg2 + 1,
+ gdb_open_modeflags[arg1]);
} else {
- ret = set_swi_errno(env, open(s, open_modeflags[arg1], 0644));
+ ret = set_swi_errno(cs, open(s, open_modeflags[arg1], 0644));
if (ret == (uint32_t)-1) {
dealloc_guestfd(guestfd);
} else {
@@ -779,17 +801,17 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = guestfd_fns[gf->type].closefn(cpu, gf);
+ ret = guestfd_fns[gf->type].closefn(cs, gf);
dealloc_guestfd(arg0);
return ret;
case TARGET_SYS_WRITEC:
- qemu_semihosting_console_outc(env, args);
+ qemu_semihosting_console_outc(cs->env_ptr, args);
return 0xdeadbeef;
case TARGET_SYS_WRITE0:
- return qemu_semihosting_console_outs(env, args);
+ return qemu_semihosting_console_outs(cs->env_ptr, args);
case TARGET_SYS_WRITE:
GET_ARG(0);
GET_ARG(1);
@@ -799,10 +821,10 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].writefn(cpu, gf, arg1, len);
+ return guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
case TARGET_SYS_READ:
GET_ARG(0);
GET_ARG(1);
@@ -812,22 +834,22 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].readfn(cpu, gf, arg1, len);
+ return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
case TARGET_SYS_READC:
- return qemu_semihosting_console_inc(env);
+ return qemu_semihosting_console_inc(cs->env_ptr);
case TARGET_SYS_ISTTY:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].isattyfn(cpu, gf);
+ return guestfd_fns[gf->type].isattyfn(cs, gf);
case TARGET_SYS_SEEK:
GET_ARG(0);
GET_ARG(1);
@@ -835,20 +857,20 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].seekfn(cpu, gf, arg1);
+ return guestfd_fns[gf->type].seekfn(cs, gf, arg1);
case TARGET_SYS_FLEN:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].flenfn(cpu, gf);
+ return guestfd_fns[gf->type].flenfn(cs, gf);
case TARGET_SYS_TMPNAM:
qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
return -1;
@@ -856,15 +878,15 @@ target_ulong do_common_semihosting(CPUState *cs)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- ret = arm_gdb_syscall(cpu, arm_semi_cb, "unlink,%s",
- arg0, (int)arg1 + 1);
+ ret = common_semi_gdb_syscall(cs, common_semi_cb, "unlink,%s",
+ arg0, (int)arg1 + 1);
} else {
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = set_swi_errno(env, remove(s));
+ ret = set_swi_errno(cs, remove(s));
unlock_user(s, arg0, 0);
}
return ret;
@@ -874,17 +896,18 @@ target_ulong do_common_semihosting(CPUState *cs)
GET_ARG(2);
GET_ARG(3);
if (use_gdb_syscalls()) {
- return arm_gdb_syscall(cpu, arm_semi_cb, "rename,%s,%s",
- arg0, (int)arg1 + 1, arg2, (int)arg3 + 1);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "rename,%s,%s",
+ arg0, (int)arg1 + 1, arg2,
+ (int)arg3 + 1);
} else {
char *s2;
s = lock_user_string(arg0);
s2 = lock_user_string(arg2);
if (!s || !s2) {
errno = EFAULT;
- ret = set_swi_errno(env, -1);
+ ret = set_swi_errno(cs, -1);
} else {
- ret = set_swi_errno(env, rename(s, s2));
+ ret = set_swi_errno(cs, rename(s, s2));
}
if (s2)
unlock_user(s2, arg2, 0);
@@ -895,25 +918,25 @@ target_ulong do_common_semihosting(CPUState *cs)
case TARGET_SYS_CLOCK:
return clock() / (CLOCKS_PER_SEC / 100);
case TARGET_SYS_TIME:
- return set_swi_errno(env, time(NULL));
+ return set_swi_errno(cs, time(NULL));
case TARGET_SYS_SYSTEM:
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- return arm_gdb_syscall(cpu, arm_semi_cb, "system,%s",
- arg0, (int)arg1 + 1);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "system,%s",
+ arg0, (int)arg1 + 1);
} else {
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = set_swi_errno(env, system(s));
+ ret = set_swi_errno(cs, system(s));
unlock_user(s, arg0, 0);
return ret;
}
case TARGET_SYS_ERRNO:
- return get_swi_errno(env);
+ return get_swi_errno(cs);
case TARGET_SYS_GET_CMDLINE:
{
/* Build a command-line from the original argv.
@@ -965,21 +988,21 @@ target_ulong do_common_semihosting(CPUState *cs)
if (output_size > input_size) {
/* Not enough space to store command-line arguments. */
errno = E2BIG;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Adjust the command-line length. */
if (SET_ARG(1, output_size - 1)) {
/* Couldn't write back to argument block */
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Lock the buffer on the ARM side. */
output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
if (!output_buffer) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Copy the command-line arguments. */
@@ -995,7 +1018,7 @@ target_ulong do_common_semihosting(CPUState *cs)
if (copy_from_user(output_buffer, ts->info->arg_start,
output_size)) {
errno = EFAULT;
- status = set_swi_errno(env, -1);
+ status = set_swi_errno(cs, -1);
goto out;
}
@@ -1020,8 +1043,7 @@ target_ulong do_common_semihosting(CPUState *cs)
#ifdef CONFIG_USER_ONLY
TaskState *ts = cs->opaque;
#else
- const struct arm_boot_info *info = env->boot_info;
- target_ulong rambase = info->loader_start;
+ target_ulong rambase = common_semi_rambase(cs);
#endif
GET_ARG(0);
@@ -1035,7 +1057,7 @@ target_ulong do_common_semihosting(CPUState *cs)
abi_ulong ret;
ts->heap_base = do_brk(0);
- limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
+ limit = ts->heap_base + COMMON_SEMI_HEAP_SIZE;
/* Try a big heap, and reduce the size if that fails. */
for (;;) {
ret = do_brk(limit);
@@ -1063,23 +1085,19 @@ target_ulong do_common_semihosting(CPUState *cs)
for (i = 0; i < ARRAY_SIZE(retvals); i++) {
bool fail;
- if (is_a64(env)) {
- fail = put_user_u64(retvals[i], arg0 + i * 8);
- } else {
- fail = put_user_u32(retvals[i], arg0 + i * 4);
- }
+ fail = SET_ARG(i, retvals[i]);
if (fail) {
/* Couldn't write back to argument block */
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
}
return 0;
}
case TARGET_SYS_EXIT:
case TARGET_SYS_EXIT_EXTENDED:
- if (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(env)) {
+ if (common_semi_sys_exit_extended(cs, nr)) {
/*
* The A64 version of SYS_EXIT takes a parameter block,
* so the application-exit type can return a subcode which
@@ -1104,7 +1122,7 @@ target_ulong do_common_semihosting(CPUState *cs)
*/
ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
}
- gdb_exit(env, ret);
+ gdb_exit(cs->env_ptr, ret);
exit(ret);
case TARGET_SYS_SYNCCACHE:
/*
@@ -1112,9 +1130,11 @@ target_ulong do_common_semihosting(CPUState *cs)
* virtual address range. This is a nop for us since we don't
* implement caches. This is only present on A64.
*/
- if (is_a64(env)) {
+#ifdef TARGET_ARM
+ if (is_a64(cs->env_ptr)) {
return 0;
}
+#endif
/* fall through -- invalid for A32/T32 */
default:
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 4/8] semihosting: Support SYS_HEAPINFO when env->boot_info is not set
2020-11-25 21:36 ` Keith Packard
@ 2020-11-25 21:36 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
env->boot_info is only set in some ARM startup paths, so we cannot
rely on it to support the SYS_HEAPINFO semihosting function. When not
available, fallback to finding a RAM memory region containing the
current stack and use the base of that.
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 42 +++++++++++++++++++++++++++++++++++-
1 file changed, 41 insertions(+), 1 deletion(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index 27bdfd0e83..ddfa448cc2 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -133,6 +133,35 @@ typedef struct GuestFD {
static GArray *guestfd_array;
+#ifndef CONFIG_USER_ONLY
+#include "exec/address-spaces.h"
+/*
+ * Find the base of a RAM region containing the specified address
+ */
+static inline hwaddr
+common_semi_find_region_base(hwaddr addr)
+{
+ MemoryRegion *subregion;
+
+ /*
+ * Find the chunk of R/W memory containing the address. This is
+ * used for the SYS_HEAPINFO semihosting call, which should
+ * probably be using information from the loaded application.
+ */
+ QTAILQ_FOREACH(subregion, &get_system_memory()->subregions,
+ subregions_link) {
+ if (subregion->ram && !subregion->readonly) {
+ Int128 top128 = int128_add(int128_make64(subregion->addr),
+ subregion->size);
+ if (subregion->addr <= addr && int128_lt(addr, top128)) {
+ return subregion->addr;
+ }
+ }
+ }
+ return 0;
+}
+#endif
+
#ifdef TARGET_ARM
static inline target_ulong
common_semi_arg(CPUState *cs, int argno)
@@ -171,7 +200,18 @@ common_semi_rambase(CPUState *cs)
{
CPUArchState *env = cs->env_ptr;
const struct arm_boot_info *info = env->boot_info;
- return info->loader_start;
+ target_ulong sp;
+
+ if (info) {
+ return info->loader_start;
+ }
+
+ if (is_a64(env)) {
+ sp = env->xregs[31];
+ } else {
+ sp = env->regs[13];
+ }
+ return common_semi_find_region_base(sp);
}
#endif
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 4/8] semihosting: Support SYS_HEAPINFO when env->boot_info is not set
@ 2020-11-25 21:36 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
env->boot_info is only set in some ARM startup paths, so we cannot
rely on it to support the SYS_HEAPINFO semihosting function. When not
available, fallback to finding a RAM memory region containing the
current stack and use the base of that.
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 42 +++++++++++++++++++++++++++++++++++-
1 file changed, 41 insertions(+), 1 deletion(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index 27bdfd0e83..ddfa448cc2 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -133,6 +133,35 @@ typedef struct GuestFD {
static GArray *guestfd_array;
+#ifndef CONFIG_USER_ONLY
+#include "exec/address-spaces.h"
+/*
+ * Find the base of a RAM region containing the specified address
+ */
+static inline hwaddr
+common_semi_find_region_base(hwaddr addr)
+{
+ MemoryRegion *subregion;
+
+ /*
+ * Find the chunk of R/W memory containing the address. This is
+ * used for the SYS_HEAPINFO semihosting call, which should
+ * probably be using information from the loaded application.
+ */
+ QTAILQ_FOREACH(subregion, &get_system_memory()->subregions,
+ subregions_link) {
+ if (subregion->ram && !subregion->readonly) {
+ Int128 top128 = int128_add(int128_make64(subregion->addr),
+ subregion->size);
+ if (subregion->addr <= addr && int128_lt(addr, top128)) {
+ return subregion->addr;
+ }
+ }
+ }
+ return 0;
+}
+#endif
+
#ifdef TARGET_ARM
static inline target_ulong
common_semi_arg(CPUState *cs, int argno)
@@ -171,7 +200,18 @@ common_semi_rambase(CPUState *cs)
{
CPUArchState *env = cs->env_ptr;
const struct arm_boot_info *info = env->boot_info;
- return info->loader_start;
+ target_ulong sp;
+
+ if (info) {
+ return info->loader_start;
+ }
+
+ if (is_a64(env)) {
+ sp = env->xregs[31];
+ } else {
+ sp = env->regs[13];
+ }
+ return common_semi_find_region_base(sp);
}
#endif
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 5/8] riscv: Add semihosting support [v13]
2020-11-25 21:36 ` Keith Packard
@ 2020-11-25 21:36 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
Adapt the arm semihosting support code for RISCV. This implementation
is based on the standard for RISC-V semihosting version 0.2 as
documented in
https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
Signed-off-by: Keith Packard <keithp@keithp.com>
---
v2:
Update PC after exception is handled to follow
change in the ARM version for SYS_READC
v3:
Disallow semihosting in user mode; report a regular
breakpoint in that case.
v4:
Fix errors reported by checkpatch
v5:
Reference current RISC-V semihosting specification
v6:
Add support for semihosting in riscv64-linux-user and
riscv32-linux-user
v7:
Add meson build support
v8:
Fix errors reported by checkpatch that crept in.
v9:
Changes suggested by Alistair Francis <alistair23@gmail.com>:
Don't add me to the MAINTAINERS file.
Remove duplicate #include in target/riscv/cpu.h
Reference RISC-V semihosting spec in target/riscv/riscv-semi.c
v10:
Use common semihosting implementation instead of a separate copy.
Make sure addresses of the three breakpoint-signaling
instructions all lie within the same page. Change suggested by
Richard Henderson <richard.henderson@linaro.org>
v11:
Use CONFIG_ARM_COMPATIBLE_SEMIHOSTING
v12:
Fix bug in SYS_EXIT support on rv64
v13:
Add common_semi_rambase implementation. This locates the
memory region containing the stack and uses the base of that.
Fix SET_ARG and GET_ARG on rv64 targets to operate on 64-bit
values rather than 32-bit. Put_user_ual/get_user_ual are
confusingly defined by softmmu-semi.h as being equivalent to
put_user_u32/get_user_u32.
---
default-configs/devices/riscv32-softmmu.mak | 2 +
default-configs/devices/riscv64-softmmu.mak | 2 +
.../targets/riscv32-linux-user.mak | 1 +
.../targets/riscv64-linux-user.mak | 1 +
hw/semihosting/common-semi.c | 82 ++++++++++++++++++-
hw/semihosting/common-semi.h | 5 +-
linux-user/qemu.h | 4 +-
linux-user/semihost.c | 8 +-
qemu-options.hx | 10 ++-
target/riscv/cpu_bits.h | 1 +
target/riscv/cpu_helper.c | 10 +++
.../riscv/insn_trans/trans_privileged.c.inc | 37 ++++++++-
target/riscv/translate.c | 11 +++
13 files changed, 162 insertions(+), 12 deletions(-)
diff --git a/default-configs/devices/riscv32-softmmu.mak b/default-configs/devices/riscv32-softmmu.mak
index 94a236c9c2..d847bd5692 100644
--- a/default-configs/devices/riscv32-softmmu.mak
+++ b/default-configs/devices/riscv32-softmmu.mak
@@ -3,6 +3,8 @@
# Uncomment the following lines to disable these optional devices:
#
#CONFIG_PCI_DEVICES=n
+CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
# Boards:
#
diff --git a/default-configs/devices/riscv64-softmmu.mak b/default-configs/devices/riscv64-softmmu.mak
index 76b6195648..d5eec75f05 100644
--- a/default-configs/devices/riscv64-softmmu.mak
+++ b/default-configs/devices/riscv64-softmmu.mak
@@ -3,6 +3,8 @@
# Uncomment the following lines to disable these optional devices:
#
#CONFIG_PCI_DEVICES=n
+CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
# Boards:
#
diff --git a/default-configs/targets/riscv32-linux-user.mak b/default-configs/targets/riscv32-linux-user.mak
index dfb259e8aa..6a9d1b1bc1 100644
--- a/default-configs/targets/riscv32-linux-user.mak
+++ b/default-configs/targets/riscv32-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=riscv32
TARGET_BASE_ARCH=riscv
TARGET_ABI_DIR=riscv
TARGET_XML_FILES= gdb-xml/riscv-32bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-32bit-csr.xml gdb-xml/riscv-32bit-virtual.xml
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/default-configs/targets/riscv64-linux-user.mak b/default-configs/targets/riscv64-linux-user.mak
index b13895f3b0..0a92849a1b 100644
--- a/default-configs/targets/riscv64-linux-user.mak
+++ b/default-configs/targets/riscv64-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=riscv64
TARGET_BASE_ARCH=riscv
TARGET_ABI_DIR=riscv
TARGET_XML_FILES= gdb-xml/riscv-64bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-64bit-csr.xml gdb-xml/riscv-64bit-virtual.xml
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index ddfa448cc2..2b6a3fd9fd 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -1,6 +1,6 @@
/*
* Semihosting support for systems modeled on the Arm "Angel"
- * semihosting syscalls design.
+ * semihosting syscalls design. This includes Arm and RISC-V processors
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
@@ -25,6 +25,10 @@
* ARM Semihosting is documented in:
* Semihosting for AArch32 and AArch64 Release 2.0
* https://static.docs.arm.com/100863/0200/semihosting.pdf
+ *
+ * RISC-V Semihosting is documented in:
+ * RISC-V Semihosting
+ * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
*/
#include "qemu/osdep.h"
@@ -217,6 +221,42 @@ common_semi_rambase(CPUState *cs)
#endif /* TARGET_ARM */
+#ifdef TARGET_RISCV
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return env->gpr[xA0 + argno];
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ env->gpr[xA0] = ret;
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
+}
+
+#ifndef CONFIG_USER_ONLY
+
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return common_semi_find_region_base(env->gpr[xSP]);
+}
+#endif
+
+#endif
+
/*
* Allocate a new guest file descriptor and return it; if we
* couldn't allocate a new fd then return -1.
@@ -393,6 +433,12 @@ static target_ulong common_semi_flen_buf(CPUState *cs)
sp = env->regs[13];
}
#endif
+#ifdef TARGET_RISCV
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+
+ sp = env->gpr[xSP];
+#endif
return sp - 64;
}
@@ -736,6 +782,37 @@ static const GuestFDFunctions guestfd_fns[] = {
put_user_u32(val, args + (n) * 4))
#endif
+#ifdef TARGET_RISCV
+
+/*
+ * get_user_ual is defined as get_user_u32 in softmmu-semi.h,
+ * we need a macro that fetches a target_ulong
+ */
+#define get_user_utl(arg, p) \
+ ((sizeof(target_ulong) == 8) ? \
+ get_user_u64(arg, p) : \
+ get_user_u32(arg, p))
+
+/*
+ * put_user_ual is defined as put_user_u32 in softmmu-semi.h,
+ * we need a macro that stores a target_ulong
+ */
+#define put_user_utl(arg, p) \
+ ((sizeof(target_ulong) == 8) ? \
+ put_user_u64(arg, p) : \
+ put_user_u32(arg, p))
+
+#define GET_ARG(n) do { \
+ if (get_user_utl(arg ## n, args + (n) * sizeof(target_ulong))) { \
+ errno = EFAULT; \
+ return set_swi_errno(cs, -1); \
+ } \
+ } while (0)
+
+#define SET_ARG(n, val) \
+ put_user_utl(val, args + (n) * sizeof(target_ulong))
+#endif
+
/*
* Do a semihosting call.
*
@@ -1174,6 +1251,9 @@ target_ulong do_common_semihosting(CPUState *cs)
if (is_a64(cs->env_ptr)) {
return 0;
}
+#endif
+#ifdef TARGET_RISCV
+ return 0;
#endif
/* fall through -- invalid for A32/T32 */
default:
diff --git a/hw/semihosting/common-semi.h b/hw/semihosting/common-semi.h
index bc53e92c79..0bfab1c669 100644
--- a/hw/semihosting/common-semi.h
+++ b/hw/semihosting/common-semi.h
@@ -1,6 +1,6 @@
/*
* Semihosting support for systems modeled on the Arm "Angel"
- * semihosting syscalls design.
+ * semihosting syscalls design. This includes Arm and RISC-V processors
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
@@ -26,6 +26,9 @@
* Semihosting for AArch32 and AArch64 Release 2.0
* https://static.docs.arm.com/100863/0200/semihosting.pdf
*
+ * RISC-V Semihosting is documented in:
+ * RISC-V Semihosting
+ * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
*/
#ifndef COMMON_SEMI_H
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 534753ca12..17aa992165 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -109,6 +109,8 @@ typedef struct TaskState {
/* FPA state */
FPA11 fpa;
# endif
+#endif
+#if defined(TARGET_ARM) || defined(TARGET_RISCV)
int swi_errno;
#endif
#if defined(TARGET_I386) && !defined(TARGET_X86_64)
@@ -122,7 +124,7 @@ typedef struct TaskState {
#ifdef TARGET_M68K
abi_ulong tp_value;
#endif
-#if defined(TARGET_ARM) || defined(TARGET_M68K)
+#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV)
/* Extra fields for semihosted binaries. */
abi_ulong heap_base;
abi_ulong heap_limit;
diff --git a/linux-user/semihost.c b/linux-user/semihost.c
index a1f0f6050e..c0015ee7f6 100644
--- a/linux-user/semihost.c
+++ b/linux-user/semihost.c
@@ -1,11 +1,11 @@
/*
- * ARM Semihosting Console Support
+ * ARM Compatible Semihosting Console Support.
*
* Copyright (c) 2019 Linaro Ltd
*
- * Currently ARM is unique in having support for semihosting support
- * in linux-user. So for now we implement the common console API but
- * just for arm linux-user.
+ * Currently ARM and RISC-V are unique in having support for
+ * semihosting support in linux-user. So for now we implement the
+ * common console API but just for arm and risc-v linux-user.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
diff --git a/qemu-options.hx b/qemu-options.hx
index 104632ea34..22b4d704b6 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4186,10 +4186,10 @@ ERST
DEF("semihosting", 0, QEMU_OPTION_semihosting,
"-semihosting semihosting mode\n",
QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
- QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
+ QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
SRST
``-semihosting``
- Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II only).
+ Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V only).
Note that this allows guest direct access to the host filesystem, so
should only be used with a trusted guest OS.
@@ -4201,10 +4201,10 @@ DEF("semihosting-config", HAS_ARG, QEMU_OPTION_semihosting_config,
"-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]\n" \
" semihosting configuration\n",
QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
-QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
+QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
SRST
``-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]``
- Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II
+ Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V
only).
Note that this allows guest direct access to the host filesystem, so
@@ -4219,6 +4219,8 @@ SRST
open/read/write/seek/select. Tensilica baremetal libc for ISS and
linux platform "sim" use this interface.
+ On RISC-V this implements the standard semihosting API, version 0.2.
+
``target=native|gdb|auto``
Defines where the semihosting calls will be addressed, to QEMU
(``native``) or to GDB (``gdb``). The default is ``auto``, which
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 24b24c69c5..f0d3d1c07e 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -544,6 +544,7 @@
#define RISCV_EXCP_INST_PAGE_FAULT 0xc /* since: priv-1.10.0 */
#define RISCV_EXCP_LOAD_PAGE_FAULT 0xd /* since: priv-1.10.0 */
#define RISCV_EXCP_STORE_PAGE_FAULT 0xf /* since: priv-1.10.0 */
+#define RISCV_EXCP_SEMIHOST 0x10
#define RISCV_EXCP_INST_GUEST_PAGE_FAULT 0x14
#define RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT 0x15
#define RISCV_EXCP_VIRT_INSTRUCTION_FAULT 0x16
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index a2787b1d48..e730fd1fe9 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -24,6 +24,7 @@
#include "exec/exec-all.h"
#include "tcg/tcg-op.h"
#include "trace.h"
+#include "hw/semihosting/common-semi.h"
int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
{
@@ -844,6 +845,15 @@ void riscv_cpu_do_interrupt(CPUState *cs)
target_ulong htval = 0;
target_ulong mtval2 = 0;
+ if (cause == RISCV_EXCP_SEMIHOST) {
+ if (env->priv >= PRV_S) {
+ env->gpr[xA0] = do_common_semihosting(cs);
+ env->pc += 4;
+ return;
+ }
+ cause = RISCV_EXCP_BREAKPOINT;
+ }
+
if (!async) {
/* set tval to badaddr for traps with address information */
switch (cause) {
diff --git a/target/riscv/insn_trans/trans_privileged.c.inc b/target/riscv/insn_trans/trans_privileged.c.inc
index 2a61a853bf..32312be202 100644
--- a/target/riscv/insn_trans/trans_privileged.c.inc
+++ b/target/riscv/insn_trans/trans_privileged.c.inc
@@ -29,7 +29,42 @@ static bool trans_ecall(DisasContext *ctx, arg_ecall *a)
static bool trans_ebreak(DisasContext *ctx, arg_ebreak *a)
{
- generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
+ target_ulong ebreak_addr = ctx->base.pc_next;
+ target_ulong pre_addr = ebreak_addr - 4;
+ target_ulong post_addr = ebreak_addr + 4;
+ uint32_t pre = 0;
+ uint32_t ebreak = 0;
+ uint32_t post = 0;
+
+ /*
+ * The RISC-V semihosting spec specifies the following
+ * three-instruction sequence to flag a semihosting call:
+ *
+ * slli zero, zero, 0x1f 0x01f01013
+ * ebreak 0x00100073
+ * srai zero, zero, 0x7 0x40705013
+ *
+ * The two shift operations on the zero register are no-ops, used
+ * here to signify a semihosting exception, rather than a breakpoint.
+ *
+ * Uncompressed instructions are required so that the sequence is easy
+ * to validate.
+ *
+ * The three instructions are required to lie in the same page so
+ * that no exception will be raised when fetching them.
+ */
+
+ if ((pre_addr & TARGET_PAGE_MASK) == (post_addr & TARGET_PAGE_MASK)) {
+ pre = opcode_at(&ctx->base, pre_addr);
+ ebreak = opcode_at(&ctx->base, ebreak_addr);
+ post = opcode_at(&ctx->base, post_addr);
+ }
+
+ if (pre == 0x01f01013 && ebreak == 0x00100073 && post == 0x40705013) {
+ generate_exception(ctx, RISCV_EXCP_SEMIHOST);
+ } else {
+ generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
+ }
exit_tb(ctx); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
return true;
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 554d52a4be..0f28b5f41e 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -64,6 +64,7 @@ typedef struct DisasContext {
uint16_t vlen;
uint16_t mlen;
bool vl_eq_vlmax;
+ CPUState *cs;
} DisasContext;
#ifdef TARGET_RISCV64
@@ -747,6 +748,15 @@ static bool gen_shift(DisasContext *ctx, arg_r *a,
return true;
}
+static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
+{
+ DisasContext *ctx = container_of(dcbase, DisasContext, base);
+ CPUState *cpu = ctx->cs;
+ CPURISCVState *env = cpu->env_ptr;
+
+ return cpu_ldl_code(env, pc);
+}
+
/* Include insn module translation function */
#include "insn_trans/trans_rvi.c.inc"
#include "insn_trans/trans_rvm.c.inc"
@@ -814,6 +824,7 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
ctx->lmul = FIELD_EX32(tb_flags, TB_FLAGS, LMUL);
ctx->mlen = 1 << (ctx->sew + 3 - ctx->lmul);
ctx->vl_eq_vlmax = FIELD_EX32(tb_flags, TB_FLAGS, VL_EQ_VLMAX);
+ ctx->cs = cs;
}
static void riscv_tr_tb_start(DisasContextBase *db, CPUState *cpu)
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 5/8] riscv: Add semihosting support [v13]
@ 2020-11-25 21:36 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
Adapt the arm semihosting support code for RISCV. This implementation
is based on the standard for RISC-V semihosting version 0.2 as
documented in
https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
Signed-off-by: Keith Packard <keithp@keithp.com>
---
v2:
Update PC after exception is handled to follow
change in the ARM version for SYS_READC
v3:
Disallow semihosting in user mode; report a regular
breakpoint in that case.
v4:
Fix errors reported by checkpatch
v5:
Reference current RISC-V semihosting specification
v6:
Add support for semihosting in riscv64-linux-user and
riscv32-linux-user
v7:
Add meson build support
v8:
Fix errors reported by checkpatch that crept in.
v9:
Changes suggested by Alistair Francis <alistair23@gmail.com>:
Don't add me to the MAINTAINERS file.
Remove duplicate #include in target/riscv/cpu.h
Reference RISC-V semihosting spec in target/riscv/riscv-semi.c
v10:
Use common semihosting implementation instead of a separate copy.
Make sure addresses of the three breakpoint-signaling
instructions all lie within the same page. Change suggested by
Richard Henderson <richard.henderson@linaro.org>
v11:
Use CONFIG_ARM_COMPATIBLE_SEMIHOSTING
v12:
Fix bug in SYS_EXIT support on rv64
v13:
Add common_semi_rambase implementation. This locates the
memory region containing the stack and uses the base of that.
Fix SET_ARG and GET_ARG on rv64 targets to operate on 64-bit
values rather than 32-bit. Put_user_ual/get_user_ual are
confusingly defined by softmmu-semi.h as being equivalent to
put_user_u32/get_user_u32.
---
default-configs/devices/riscv32-softmmu.mak | 2 +
default-configs/devices/riscv64-softmmu.mak | 2 +
.../targets/riscv32-linux-user.mak | 1 +
.../targets/riscv64-linux-user.mak | 1 +
hw/semihosting/common-semi.c | 82 ++++++++++++++++++-
hw/semihosting/common-semi.h | 5 +-
linux-user/qemu.h | 4 +-
linux-user/semihost.c | 8 +-
qemu-options.hx | 10 ++-
target/riscv/cpu_bits.h | 1 +
target/riscv/cpu_helper.c | 10 +++
.../riscv/insn_trans/trans_privileged.c.inc | 37 ++++++++-
target/riscv/translate.c | 11 +++
13 files changed, 162 insertions(+), 12 deletions(-)
diff --git a/default-configs/devices/riscv32-softmmu.mak b/default-configs/devices/riscv32-softmmu.mak
index 94a236c9c2..d847bd5692 100644
--- a/default-configs/devices/riscv32-softmmu.mak
+++ b/default-configs/devices/riscv32-softmmu.mak
@@ -3,6 +3,8 @@
# Uncomment the following lines to disable these optional devices:
#
#CONFIG_PCI_DEVICES=n
+CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
# Boards:
#
diff --git a/default-configs/devices/riscv64-softmmu.mak b/default-configs/devices/riscv64-softmmu.mak
index 76b6195648..d5eec75f05 100644
--- a/default-configs/devices/riscv64-softmmu.mak
+++ b/default-configs/devices/riscv64-softmmu.mak
@@ -3,6 +3,8 @@
# Uncomment the following lines to disable these optional devices:
#
#CONFIG_PCI_DEVICES=n
+CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
# Boards:
#
diff --git a/default-configs/targets/riscv32-linux-user.mak b/default-configs/targets/riscv32-linux-user.mak
index dfb259e8aa..6a9d1b1bc1 100644
--- a/default-configs/targets/riscv32-linux-user.mak
+++ b/default-configs/targets/riscv32-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=riscv32
TARGET_BASE_ARCH=riscv
TARGET_ABI_DIR=riscv
TARGET_XML_FILES= gdb-xml/riscv-32bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-32bit-csr.xml gdb-xml/riscv-32bit-virtual.xml
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/default-configs/targets/riscv64-linux-user.mak b/default-configs/targets/riscv64-linux-user.mak
index b13895f3b0..0a92849a1b 100644
--- a/default-configs/targets/riscv64-linux-user.mak
+++ b/default-configs/targets/riscv64-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=riscv64
TARGET_BASE_ARCH=riscv
TARGET_ABI_DIR=riscv
TARGET_XML_FILES= gdb-xml/riscv-64bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-64bit-csr.xml gdb-xml/riscv-64bit-virtual.xml
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index ddfa448cc2..2b6a3fd9fd 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -1,6 +1,6 @@
/*
* Semihosting support for systems modeled on the Arm "Angel"
- * semihosting syscalls design.
+ * semihosting syscalls design. This includes Arm and RISC-V processors
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
@@ -25,6 +25,10 @@
* ARM Semihosting is documented in:
* Semihosting for AArch32 and AArch64 Release 2.0
* https://static.docs.arm.com/100863/0200/semihosting.pdf
+ *
+ * RISC-V Semihosting is documented in:
+ * RISC-V Semihosting
+ * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
*/
#include "qemu/osdep.h"
@@ -217,6 +221,42 @@ common_semi_rambase(CPUState *cs)
#endif /* TARGET_ARM */
+#ifdef TARGET_RISCV
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return env->gpr[xA0 + argno];
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ env->gpr[xA0] = ret;
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
+}
+
+#ifndef CONFIG_USER_ONLY
+
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return common_semi_find_region_base(env->gpr[xSP]);
+}
+#endif
+
+#endif
+
/*
* Allocate a new guest file descriptor and return it; if we
* couldn't allocate a new fd then return -1.
@@ -393,6 +433,12 @@ static target_ulong common_semi_flen_buf(CPUState *cs)
sp = env->regs[13];
}
#endif
+#ifdef TARGET_RISCV
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+
+ sp = env->gpr[xSP];
+#endif
return sp - 64;
}
@@ -736,6 +782,37 @@ static const GuestFDFunctions guestfd_fns[] = {
put_user_u32(val, args + (n) * 4))
#endif
+#ifdef TARGET_RISCV
+
+/*
+ * get_user_ual is defined as get_user_u32 in softmmu-semi.h,
+ * we need a macro that fetches a target_ulong
+ */
+#define get_user_utl(arg, p) \
+ ((sizeof(target_ulong) == 8) ? \
+ get_user_u64(arg, p) : \
+ get_user_u32(arg, p))
+
+/*
+ * put_user_ual is defined as put_user_u32 in softmmu-semi.h,
+ * we need a macro that stores a target_ulong
+ */
+#define put_user_utl(arg, p) \
+ ((sizeof(target_ulong) == 8) ? \
+ put_user_u64(arg, p) : \
+ put_user_u32(arg, p))
+
+#define GET_ARG(n) do { \
+ if (get_user_utl(arg ## n, args + (n) * sizeof(target_ulong))) { \
+ errno = EFAULT; \
+ return set_swi_errno(cs, -1); \
+ } \
+ } while (0)
+
+#define SET_ARG(n, val) \
+ put_user_utl(val, args + (n) * sizeof(target_ulong))
+#endif
+
/*
* Do a semihosting call.
*
@@ -1174,6 +1251,9 @@ target_ulong do_common_semihosting(CPUState *cs)
if (is_a64(cs->env_ptr)) {
return 0;
}
+#endif
+#ifdef TARGET_RISCV
+ return 0;
#endif
/* fall through -- invalid for A32/T32 */
default:
diff --git a/hw/semihosting/common-semi.h b/hw/semihosting/common-semi.h
index bc53e92c79..0bfab1c669 100644
--- a/hw/semihosting/common-semi.h
+++ b/hw/semihosting/common-semi.h
@@ -1,6 +1,6 @@
/*
* Semihosting support for systems modeled on the Arm "Angel"
- * semihosting syscalls design.
+ * semihosting syscalls design. This includes Arm and RISC-V processors
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
@@ -26,6 +26,9 @@
* Semihosting for AArch32 and AArch64 Release 2.0
* https://static.docs.arm.com/100863/0200/semihosting.pdf
*
+ * RISC-V Semihosting is documented in:
+ * RISC-V Semihosting
+ * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
*/
#ifndef COMMON_SEMI_H
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 534753ca12..17aa992165 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -109,6 +109,8 @@ typedef struct TaskState {
/* FPA state */
FPA11 fpa;
# endif
+#endif
+#if defined(TARGET_ARM) || defined(TARGET_RISCV)
int swi_errno;
#endif
#if defined(TARGET_I386) && !defined(TARGET_X86_64)
@@ -122,7 +124,7 @@ typedef struct TaskState {
#ifdef TARGET_M68K
abi_ulong tp_value;
#endif
-#if defined(TARGET_ARM) || defined(TARGET_M68K)
+#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV)
/* Extra fields for semihosted binaries. */
abi_ulong heap_base;
abi_ulong heap_limit;
diff --git a/linux-user/semihost.c b/linux-user/semihost.c
index a1f0f6050e..c0015ee7f6 100644
--- a/linux-user/semihost.c
+++ b/linux-user/semihost.c
@@ -1,11 +1,11 @@
/*
- * ARM Semihosting Console Support
+ * ARM Compatible Semihosting Console Support.
*
* Copyright (c) 2019 Linaro Ltd
*
- * Currently ARM is unique in having support for semihosting support
- * in linux-user. So for now we implement the common console API but
- * just for arm linux-user.
+ * Currently ARM and RISC-V are unique in having support for
+ * semihosting support in linux-user. So for now we implement the
+ * common console API but just for arm and risc-v linux-user.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
diff --git a/qemu-options.hx b/qemu-options.hx
index 104632ea34..22b4d704b6 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4186,10 +4186,10 @@ ERST
DEF("semihosting", 0, QEMU_OPTION_semihosting,
"-semihosting semihosting mode\n",
QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
- QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
+ QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
SRST
``-semihosting``
- Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II only).
+ Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V only).
Note that this allows guest direct access to the host filesystem, so
should only be used with a trusted guest OS.
@@ -4201,10 +4201,10 @@ DEF("semihosting-config", HAS_ARG, QEMU_OPTION_semihosting_config,
"-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]\n" \
" semihosting configuration\n",
QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
-QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
+QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
SRST
``-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]``
- Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II
+ Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V
only).
Note that this allows guest direct access to the host filesystem, so
@@ -4219,6 +4219,8 @@ SRST
open/read/write/seek/select. Tensilica baremetal libc for ISS and
linux platform "sim" use this interface.
+ On RISC-V this implements the standard semihosting API, version 0.2.
+
``target=native|gdb|auto``
Defines where the semihosting calls will be addressed, to QEMU
(``native``) or to GDB (``gdb``). The default is ``auto``, which
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 24b24c69c5..f0d3d1c07e 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -544,6 +544,7 @@
#define RISCV_EXCP_INST_PAGE_FAULT 0xc /* since: priv-1.10.0 */
#define RISCV_EXCP_LOAD_PAGE_FAULT 0xd /* since: priv-1.10.0 */
#define RISCV_EXCP_STORE_PAGE_FAULT 0xf /* since: priv-1.10.0 */
+#define RISCV_EXCP_SEMIHOST 0x10
#define RISCV_EXCP_INST_GUEST_PAGE_FAULT 0x14
#define RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT 0x15
#define RISCV_EXCP_VIRT_INSTRUCTION_FAULT 0x16
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index a2787b1d48..e730fd1fe9 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -24,6 +24,7 @@
#include "exec/exec-all.h"
#include "tcg/tcg-op.h"
#include "trace.h"
+#include "hw/semihosting/common-semi.h"
int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
{
@@ -844,6 +845,15 @@ void riscv_cpu_do_interrupt(CPUState *cs)
target_ulong htval = 0;
target_ulong mtval2 = 0;
+ if (cause == RISCV_EXCP_SEMIHOST) {
+ if (env->priv >= PRV_S) {
+ env->gpr[xA0] = do_common_semihosting(cs);
+ env->pc += 4;
+ return;
+ }
+ cause = RISCV_EXCP_BREAKPOINT;
+ }
+
if (!async) {
/* set tval to badaddr for traps with address information */
switch (cause) {
diff --git a/target/riscv/insn_trans/trans_privileged.c.inc b/target/riscv/insn_trans/trans_privileged.c.inc
index 2a61a853bf..32312be202 100644
--- a/target/riscv/insn_trans/trans_privileged.c.inc
+++ b/target/riscv/insn_trans/trans_privileged.c.inc
@@ -29,7 +29,42 @@ static bool trans_ecall(DisasContext *ctx, arg_ecall *a)
static bool trans_ebreak(DisasContext *ctx, arg_ebreak *a)
{
- generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
+ target_ulong ebreak_addr = ctx->base.pc_next;
+ target_ulong pre_addr = ebreak_addr - 4;
+ target_ulong post_addr = ebreak_addr + 4;
+ uint32_t pre = 0;
+ uint32_t ebreak = 0;
+ uint32_t post = 0;
+
+ /*
+ * The RISC-V semihosting spec specifies the following
+ * three-instruction sequence to flag a semihosting call:
+ *
+ * slli zero, zero, 0x1f 0x01f01013
+ * ebreak 0x00100073
+ * srai zero, zero, 0x7 0x40705013
+ *
+ * The two shift operations on the zero register are no-ops, used
+ * here to signify a semihosting exception, rather than a breakpoint.
+ *
+ * Uncompressed instructions are required so that the sequence is easy
+ * to validate.
+ *
+ * The three instructions are required to lie in the same page so
+ * that no exception will be raised when fetching them.
+ */
+
+ if ((pre_addr & TARGET_PAGE_MASK) == (post_addr & TARGET_PAGE_MASK)) {
+ pre = opcode_at(&ctx->base, pre_addr);
+ ebreak = opcode_at(&ctx->base, ebreak_addr);
+ post = opcode_at(&ctx->base, post_addr);
+ }
+
+ if (pre == 0x01f01013 && ebreak == 0x00100073 && post == 0x40705013) {
+ generate_exception(ctx, RISCV_EXCP_SEMIHOST);
+ } else {
+ generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
+ }
exit_tb(ctx); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
return true;
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 554d52a4be..0f28b5f41e 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -64,6 +64,7 @@ typedef struct DisasContext {
uint16_t vlen;
uint16_t mlen;
bool vl_eq_vlmax;
+ CPUState *cs;
} DisasContext;
#ifdef TARGET_RISCV64
@@ -747,6 +748,15 @@ static bool gen_shift(DisasContext *ctx, arg_r *a,
return true;
}
+static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
+{
+ DisasContext *ctx = container_of(dcbase, DisasContext, base);
+ CPUState *cpu = ctx->cs;
+ CPURISCVState *env = cpu->env_ptr;
+
+ return cpu_ldl_code(env, pc);
+}
+
/* Include insn module translation function */
#include "insn_trans/trans_rvi.c.inc"
#include "insn_trans/trans_rvm.c.inc"
@@ -814,6 +824,7 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
ctx->lmul = FIELD_EX32(tb_flags, TB_FLAGS, LMUL);
ctx->mlen = 1 << (ctx->sew + 3 - ctx->lmul);
ctx->vl_eq_vlmax = FIELD_EX32(tb_flags, TB_FLAGS, VL_EQ_VLMAX);
+ ctx->cs = cs;
}
static void riscv_tr_tb_start(DisasContextBase *db, CPUState *cpu)
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 6/8] semihosting: Implement SYS_ELAPSED and SYS_TICKFREQ
2020-11-25 21:36 ` Keith Packard
@ 2020-11-25 21:36 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
These are part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 16 ++++++++++++++++
include/qemu/timer.h | 2 ++
util/qemu-timer-common.c | 4 ++++
3 files changed, 22 insertions(+)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index 2b6a3fd9fd..c84b0d906b 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -38,6 +38,7 @@
#include "hw/semihosting/console.h"
#include "hw/semihosting/common-semi.h"
#include "qemu/log.h"
+#include "qemu/timer.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
@@ -69,6 +70,8 @@
#define TARGET_SYS_EXIT 0x18
#define TARGET_SYS_SYNCCACHE 0x19
#define TARGET_SYS_EXIT_EXTENDED 0x20
+#define TARGET_SYS_ELAPSED 0x30
+#define TARGET_SYS_TICKFREQ 0x31
/* ADP_Stopped_ApplicationExit is used for exit(0),
* anything else is implemented as exit(1) */
@@ -832,6 +835,7 @@ target_ulong do_common_semihosting(CPUState *cs)
uint32_t ret;
uint32_t len;
GuestFD *gf;
+ int64_t elapsed;
(void) env; /* Used implicitly by arm lock_user macro */
nr = common_semi_arg(cs, 0) & 0xffffffffU;
@@ -1241,6 +1245,18 @@ target_ulong do_common_semihosting(CPUState *cs)
}
gdb_exit(cs->env_ptr, ret);
exit(ret);
+ case TARGET_SYS_ELAPSED:
+ elapsed = get_clock() - clock_start;
+ if (sizeof(target_ulong) == 8) {
+ SET_ARG(0, elapsed);
+ } else {
+ SET_ARG(0, (uint32_t) elapsed);
+ SET_ARG(1, (uint32_t) (elapsed >> 32));
+ }
+ return 0;
+ case TARGET_SYS_TICKFREQ:
+ /* qemu always uses nsec */
+ return 1000000000;
case TARGET_SYS_SYNCCACHE:
/*
* Clean the D-cache and invalidate the I-cache for the specified
diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index bdecc5b41f..ca6fae51f1 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -806,6 +806,8 @@ static inline int64_t get_clock_realtime(void)
return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
}
+extern int64_t clock_start;
+
/* Warning: don't insert tracepoints into these functions, they are
also used by simpletrace backend and tracepoints would cause
an infinite recursion! */
diff --git a/util/qemu-timer-common.c b/util/qemu-timer-common.c
index baf3317f74..cc1326f726 100644
--- a/util/qemu-timer-common.c
+++ b/util/qemu-timer-common.c
@@ -27,6 +27,8 @@
/***********************************************************/
/* real time host monotonic timer */
+int64_t clock_start;
+
#ifdef _WIN32
int64_t clock_freq;
@@ -41,6 +43,7 @@ static void __attribute__((constructor)) init_get_clock(void)
exit(1);
}
clock_freq = freq.QuadPart;
+ clock_start = get_clock();
}
#else
@@ -55,5 +58,6 @@ static void __attribute__((constructor)) init_get_clock(void)
if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
use_rt_clock = 1;
}
+ clock_start = get_clock();
}
#endif
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 6/8] semihosting: Implement SYS_ELAPSED and SYS_TICKFREQ
@ 2020-11-25 21:36 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
These are part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 16 ++++++++++++++++
include/qemu/timer.h | 2 ++
util/qemu-timer-common.c | 4 ++++
3 files changed, 22 insertions(+)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index 2b6a3fd9fd..c84b0d906b 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -38,6 +38,7 @@
#include "hw/semihosting/console.h"
#include "hw/semihosting/common-semi.h"
#include "qemu/log.h"
+#include "qemu/timer.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
@@ -69,6 +70,8 @@
#define TARGET_SYS_EXIT 0x18
#define TARGET_SYS_SYNCCACHE 0x19
#define TARGET_SYS_EXIT_EXTENDED 0x20
+#define TARGET_SYS_ELAPSED 0x30
+#define TARGET_SYS_TICKFREQ 0x31
/* ADP_Stopped_ApplicationExit is used for exit(0),
* anything else is implemented as exit(1) */
@@ -832,6 +835,7 @@ target_ulong do_common_semihosting(CPUState *cs)
uint32_t ret;
uint32_t len;
GuestFD *gf;
+ int64_t elapsed;
(void) env; /* Used implicitly by arm lock_user macro */
nr = common_semi_arg(cs, 0) & 0xffffffffU;
@@ -1241,6 +1245,18 @@ target_ulong do_common_semihosting(CPUState *cs)
}
gdb_exit(cs->env_ptr, ret);
exit(ret);
+ case TARGET_SYS_ELAPSED:
+ elapsed = get_clock() - clock_start;
+ if (sizeof(target_ulong) == 8) {
+ SET_ARG(0, elapsed);
+ } else {
+ SET_ARG(0, (uint32_t) elapsed);
+ SET_ARG(1, (uint32_t) (elapsed >> 32));
+ }
+ return 0;
+ case TARGET_SYS_TICKFREQ:
+ /* qemu always uses nsec */
+ return 1000000000;
case TARGET_SYS_SYNCCACHE:
/*
* Clean the D-cache and invalidate the I-cache for the specified
diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index bdecc5b41f..ca6fae51f1 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -806,6 +806,8 @@ static inline int64_t get_clock_realtime(void)
return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
}
+extern int64_t clock_start;
+
/* Warning: don't insert tracepoints into these functions, they are
also used by simpletrace backend and tracepoints would cause
an infinite recursion! */
diff --git a/util/qemu-timer-common.c b/util/qemu-timer-common.c
index baf3317f74..cc1326f726 100644
--- a/util/qemu-timer-common.c
+++ b/util/qemu-timer-common.c
@@ -27,6 +27,8 @@
/***********************************************************/
/* real time host monotonic timer */
+int64_t clock_start;
+
#ifdef _WIN32
int64_t clock_freq;
@@ -41,6 +43,7 @@ static void __attribute__((constructor)) init_get_clock(void)
exit(1);
}
clock_freq = freq.QuadPart;
+ clock_start = get_clock();
}
#else
@@ -55,5 +58,6 @@ static void __attribute__((constructor)) init_get_clock(void)
if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
use_rt_clock = 1;
}
+ clock_start = get_clock();
}
#endif
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 7/8] semihosting: Implement SYS_TMPNAM
2020-11-25 21:36 ` Keith Packard
@ 2020-11-25 21:36 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
Part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index c84b0d906b..9a04d98e4e 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -830,6 +830,7 @@ target_ulong do_common_semihosting(CPUState *cs)
CPUArchState *env = cs->env_ptr;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
+ target_ulong ul_ret;
char * s;
int nr;
uint32_t ret;
@@ -993,8 +994,24 @@ target_ulong do_common_semihosting(CPUState *cs)
return guestfd_fns[gf->type].flenfn(cs, gf);
case TARGET_SYS_TMPNAM:
- qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
- return -1;
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ if (asprintf(&s, "/tmp/qemu-%x%02x", getpid(),
+ (int) (arg1 & 0xff)) < 0) {
+ return -1;
+ }
+ ul_ret = (target_ulong) -1;
+
+ /* Make sure there's enough space in the buffer */
+ if (strlen(s) < arg2) {
+ char *output = lock_user(VERIFY_WRITE, arg0, arg2, 0);
+ strcpy(output, s);
+ unlock_user(output, arg0, arg2);
+ ul_ret = 0;
+ }
+ free(s);
+ return ul_ret;
case TARGET_SYS_REMOVE:
GET_ARG(0);
GET_ARG(1);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 7/8] semihosting: Implement SYS_TMPNAM
@ 2020-11-25 21:36 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
Part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index c84b0d906b..9a04d98e4e 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -830,6 +830,7 @@ target_ulong do_common_semihosting(CPUState *cs)
CPUArchState *env = cs->env_ptr;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
+ target_ulong ul_ret;
char * s;
int nr;
uint32_t ret;
@@ -993,8 +994,24 @@ target_ulong do_common_semihosting(CPUState *cs)
return guestfd_fns[gf->type].flenfn(cs, gf);
case TARGET_SYS_TMPNAM:
- qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
- return -1;
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ if (asprintf(&s, "/tmp/qemu-%x%02x", getpid(),
+ (int) (arg1 & 0xff)) < 0) {
+ return -1;
+ }
+ ul_ret = (target_ulong) -1;
+
+ /* Make sure there's enough space in the buffer */
+ if (strlen(s) < arg2) {
+ char *output = lock_user(VERIFY_WRITE, arg0, arg2, 0);
+ strcpy(output, s);
+ unlock_user(output, arg0, arg2);
+ ul_ret = 0;
+ }
+ free(s);
+ return ul_ret;
case TARGET_SYS_REMOVE:
GET_ARG(0);
GET_ARG(1);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 8/8] semihosting: Implement SYS_ISERROR
2020-11-25 21:36 ` Keith Packard
@ 2020-11-25 21:36 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
Part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index 9a04d98e4e..fda0e714ef 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -55,6 +55,7 @@
#define TARGET_SYS_WRITE 0x05
#define TARGET_SYS_READ 0x06
#define TARGET_SYS_READC 0x07
+#define TARGET_SYS_ISERROR 0x08
#define TARGET_SYS_ISTTY 0x09
#define TARGET_SYS_SEEK 0x0a
#define TARGET_SYS_FLEN 0x0c
@@ -962,6 +963,9 @@ target_ulong do_common_semihosting(CPUState *cs)
return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
case TARGET_SYS_READC:
return qemu_semihosting_console_inc(cs->env_ptr);
+ case TARGET_SYS_ISERROR:
+ GET_ARG(0);
+ return (target_long) arg0 < 0 ? 1 : 0;
case TARGET_SYS_ISTTY:
GET_ARG(0);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 8/8] semihosting: Implement SYS_ISERROR
@ 2020-11-25 21:36 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-11-25 21:36 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
Part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index 9a04d98e4e..fda0e714ef 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -55,6 +55,7 @@
#define TARGET_SYS_WRITE 0x05
#define TARGET_SYS_READ 0x06
#define TARGET_SYS_READC 0x07
+#define TARGET_SYS_ISERROR 0x08
#define TARGET_SYS_ISTTY 0x09
#define TARGET_SYS_SEEK 0x0a
#define TARGET_SYS_FLEN 0x0c
@@ -962,6 +963,9 @@ target_ulong do_common_semihosting(CPUState *cs)
return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
case TARGET_SYS_READC:
return qemu_semihosting_console_inc(cs->env_ptr);
+ case TARGET_SYS_ISERROR:
+ GET_ARG(0);
+ return (target_long) arg0 < 0 ? 1 : 0;
case TARGET_SYS_ISTTY:
GET_ARG(0);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* Re: [PATCH 5/8] riscv: Add semihosting support [v13]
2020-11-25 21:36 ` Keith Packard
@ 2020-12-09 7:58 ` Kito Cheng
-1 siblings, 0 replies; 54+ messages in thread
From: Kito Cheng @ 2020-12-09 7:58 UTC (permalink / raw)
To: Keith Packard
Cc: Peter Maydell, qemu-riscv, Sagar Karandikar, Bastian Koppelmann,
Laurent Vivier, qemu-devel, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
[-- Attachment #1: Type: text/plain, Size: 18017 bytes --]
Hi Keith:
Thanks for the patch, I've verified with newlib semihosting support
which is contributed by Craig Blackmore from embecosm,
and I would like to add semihosting to user mode, do you mind add this
patch into this patch series?
On Thu, Nov 26, 2020 at 5:41 AM Keith Packard via <qemu-riscv@nongnu.org> wrote:
>
> Adapt the arm semihosting support code for RISCV. This implementation
> is based on the standard for RISC-V semihosting version 0.2 as
> documented in
>
> https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
>
> Signed-off-by: Keith Packard <keithp@keithp.com>
>
> ---
>
> v2:
> Update PC after exception is handled to follow
> change in the ARM version for SYS_READC
>
> v3:
> Disallow semihosting in user mode; report a regular
> breakpoint in that case.
>
> v4:
> Fix errors reported by checkpatch
>
> v5:
> Reference current RISC-V semihosting specification
>
> v6:
> Add support for semihosting in riscv64-linux-user and
> riscv32-linux-user
>
> v7:
> Add meson build support
>
> v8:
> Fix errors reported by checkpatch that crept in.
>
> v9:
> Changes suggested by Alistair Francis <alistair23@gmail.com>:
> Don't add me to the MAINTAINERS file.
> Remove duplicate #include in target/riscv/cpu.h
> Reference RISC-V semihosting spec in target/riscv/riscv-semi.c
>
> v10:
> Use common semihosting implementation instead of a separate copy.
>
> Make sure addresses of the three breakpoint-signaling
> instructions all lie within the same page. Change suggested by
> Richard Henderson <richard.henderson@linaro.org>
>
> v11:
> Use CONFIG_ARM_COMPATIBLE_SEMIHOSTING
>
> v12:
> Fix bug in SYS_EXIT support on rv64
>
> v13:
> Add common_semi_rambase implementation. This locates the
> memory region containing the stack and uses the base of that.
>
> Fix SET_ARG and GET_ARG on rv64 targets to operate on 64-bit
> values rather than 32-bit. Put_user_ual/get_user_ual are
> confusingly defined by softmmu-semi.h as being equivalent to
> put_user_u32/get_user_u32.
> ---
> default-configs/devices/riscv32-softmmu.mak | 2 +
> default-configs/devices/riscv64-softmmu.mak | 2 +
> .../targets/riscv32-linux-user.mak | 1 +
> .../targets/riscv64-linux-user.mak | 1 +
> hw/semihosting/common-semi.c | 82 ++++++++++++++++++-
> hw/semihosting/common-semi.h | 5 +-
> linux-user/qemu.h | 4 +-
> linux-user/semihost.c | 8 +-
> qemu-options.hx | 10 ++-
> target/riscv/cpu_bits.h | 1 +
> target/riscv/cpu_helper.c | 10 +++
> .../riscv/insn_trans/trans_privileged.c.inc | 37 ++++++++-
> target/riscv/translate.c | 11 +++
> 13 files changed, 162 insertions(+), 12 deletions(-)
>
> diff --git a/default-configs/devices/riscv32-softmmu.mak b/default-configs/devices/riscv32-softmmu.mak
> index 94a236c9c2..d847bd5692 100644
> --- a/default-configs/devices/riscv32-softmmu.mak
> +++ b/default-configs/devices/riscv32-softmmu.mak
> @@ -3,6 +3,8 @@
> # Uncomment the following lines to disable these optional devices:
> #
> #CONFIG_PCI_DEVICES=n
> +CONFIG_SEMIHOSTING=y
> +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
>
> # Boards:
> #
> diff --git a/default-configs/devices/riscv64-softmmu.mak b/default-configs/devices/riscv64-softmmu.mak
> index 76b6195648..d5eec75f05 100644
> --- a/default-configs/devices/riscv64-softmmu.mak
> +++ b/default-configs/devices/riscv64-softmmu.mak
> @@ -3,6 +3,8 @@
> # Uncomment the following lines to disable these optional devices:
> #
> #CONFIG_PCI_DEVICES=n
> +CONFIG_SEMIHOSTING=y
> +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
>
> # Boards:
> #
> diff --git a/default-configs/targets/riscv32-linux-user.mak b/default-configs/targets/riscv32-linux-user.mak
> index dfb259e8aa..6a9d1b1bc1 100644
> --- a/default-configs/targets/riscv32-linux-user.mak
> +++ b/default-configs/targets/riscv32-linux-user.mak
> @@ -2,3 +2,4 @@ TARGET_ARCH=riscv32
> TARGET_BASE_ARCH=riscv
> TARGET_ABI_DIR=riscv
> TARGET_XML_FILES= gdb-xml/riscv-32bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-32bit-csr.xml gdb-xml/riscv-32bit-virtual.xml
> +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
> diff --git a/default-configs/targets/riscv64-linux-user.mak b/default-configs/targets/riscv64-linux-user.mak
> index b13895f3b0..0a92849a1b 100644
> --- a/default-configs/targets/riscv64-linux-user.mak
> +++ b/default-configs/targets/riscv64-linux-user.mak
> @@ -2,3 +2,4 @@ TARGET_ARCH=riscv64
> TARGET_BASE_ARCH=riscv
> TARGET_ABI_DIR=riscv
> TARGET_XML_FILES= gdb-xml/riscv-64bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-64bit-csr.xml gdb-xml/riscv-64bit-virtual.xml
> +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
> diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
> index ddfa448cc2..2b6a3fd9fd 100644
> --- a/hw/semihosting/common-semi.c
> +++ b/hw/semihosting/common-semi.c
> @@ -1,6 +1,6 @@
> /*
> * Semihosting support for systems modeled on the Arm "Angel"
> - * semihosting syscalls design.
> + * semihosting syscalls design. This includes Arm and RISC-V processors
> *
> * Copyright (c) 2005, 2007 CodeSourcery.
> * Copyright (c) 2019 Linaro
> @@ -25,6 +25,10 @@
> * ARM Semihosting is documented in:
> * Semihosting for AArch32 and AArch64 Release 2.0
> * https://static.docs.arm.com/100863/0200/semihosting.pdf
> + *
> + * RISC-V Semihosting is documented in:
> + * RISC-V Semihosting
> + * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
> */
>
> #include "qemu/osdep.h"
> @@ -217,6 +221,42 @@ common_semi_rambase(CPUState *cs)
>
> #endif /* TARGET_ARM */
>
> +#ifdef TARGET_RISCV
> +static inline target_ulong
> +common_semi_arg(CPUState *cs, int argno)
> +{
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + CPURISCVState *env = &cpu->env;
> + return env->gpr[xA0 + argno];
> +}
> +
> +static inline void
> +common_semi_set_ret(CPUState *cs, target_ulong ret)
> +{
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + CPURISCVState *env = &cpu->env;
> + env->gpr[xA0] = ret;
> +}
> +
> +static inline bool
> +common_semi_sys_exit_extended(CPUState *cs, int nr)
> +{
> + return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
> +}
> +
> +#ifndef CONFIG_USER_ONLY
> +
> +static inline target_ulong
> +common_semi_rambase(CPUState *cs)
> +{
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + CPURISCVState *env = &cpu->env;
> + return common_semi_find_region_base(env->gpr[xSP]);
> +}
> +#endif
> +
> +#endif
> +
> /*
> * Allocate a new guest file descriptor and return it; if we
> * couldn't allocate a new fd then return -1.
> @@ -393,6 +433,12 @@ static target_ulong common_semi_flen_buf(CPUState *cs)
> sp = env->regs[13];
> }
> #endif
> +#ifdef TARGET_RISCV
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + CPURISCVState *env = &cpu->env;
> +
> + sp = env->gpr[xSP];
> +#endif
>
> return sp - 64;
> }
> @@ -736,6 +782,37 @@ static const GuestFDFunctions guestfd_fns[] = {
> put_user_u32(val, args + (n) * 4))
> #endif
>
> +#ifdef TARGET_RISCV
> +
> +/*
> + * get_user_ual is defined as get_user_u32 in softmmu-semi.h,
> + * we need a macro that fetches a target_ulong
> + */
> +#define get_user_utl(arg, p) \
> + ((sizeof(target_ulong) == 8) ? \
> + get_user_u64(arg, p) : \
> + get_user_u32(arg, p))
> +
> +/*
> + * put_user_ual is defined as put_user_u32 in softmmu-semi.h,
> + * we need a macro that stores a target_ulong
> + */
> +#define put_user_utl(arg, p) \
> + ((sizeof(target_ulong) == 8) ? \
> + put_user_u64(arg, p) : \
> + put_user_u32(arg, p))
> +
> +#define GET_ARG(n) do { \
> + if (get_user_utl(arg ## n, args + (n) * sizeof(target_ulong))) { \
> + errno = EFAULT; \
> + return set_swi_errno(cs, -1); \
> + } \
> + } while (0)
> +
> +#define SET_ARG(n, val) \
> + put_user_utl(val, args + (n) * sizeof(target_ulong))
> +#endif
> +
> /*
> * Do a semihosting call.
> *
> @@ -1174,6 +1251,9 @@ target_ulong do_common_semihosting(CPUState *cs)
> if (is_a64(cs->env_ptr)) {
> return 0;
> }
> +#endif
> +#ifdef TARGET_RISCV
> + return 0;
> #endif
> /* fall through -- invalid for A32/T32 */
> default:
> diff --git a/hw/semihosting/common-semi.h b/hw/semihosting/common-semi.h
> index bc53e92c79..0bfab1c669 100644
> --- a/hw/semihosting/common-semi.h
> +++ b/hw/semihosting/common-semi.h
> @@ -1,6 +1,6 @@
> /*
> * Semihosting support for systems modeled on the Arm "Angel"
> - * semihosting syscalls design.
> + * semihosting syscalls design. This includes Arm and RISC-V processors
> *
> * Copyright (c) 2005, 2007 CodeSourcery.
> * Copyright (c) 2019 Linaro
> @@ -26,6 +26,9 @@
> * Semihosting for AArch32 and AArch64 Release 2.0
> * https://static.docs.arm.com/100863/0200/semihosting.pdf
> *
> + * RISC-V Semihosting is documented in:
> + * RISC-V Semihosting
> + * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
> */
>
> #ifndef COMMON_SEMI_H
> diff --git a/linux-user/qemu.h b/linux-user/qemu.h
> index 534753ca12..17aa992165 100644
> --- a/linux-user/qemu.h
> +++ b/linux-user/qemu.h
> @@ -109,6 +109,8 @@ typedef struct TaskState {
> /* FPA state */
> FPA11 fpa;
> # endif
> +#endif
> +#if defined(TARGET_ARM) || defined(TARGET_RISCV)
> int swi_errno;
> #endif
> #if defined(TARGET_I386) && !defined(TARGET_X86_64)
> @@ -122,7 +124,7 @@ typedef struct TaskState {
> #ifdef TARGET_M68K
> abi_ulong tp_value;
> #endif
> -#if defined(TARGET_ARM) || defined(TARGET_M68K)
> +#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV)
> /* Extra fields for semihosted binaries. */
> abi_ulong heap_base;
> abi_ulong heap_limit;
> diff --git a/linux-user/semihost.c b/linux-user/semihost.c
> index a1f0f6050e..c0015ee7f6 100644
> --- a/linux-user/semihost.c
> +++ b/linux-user/semihost.c
> @@ -1,11 +1,11 @@
> /*
> - * ARM Semihosting Console Support
> + * ARM Compatible Semihosting Console Support.
> *
> * Copyright (c) 2019 Linaro Ltd
> *
> - * Currently ARM is unique in having support for semihosting support
> - * in linux-user. So for now we implement the common console API but
> - * just for arm linux-user.
> + * Currently ARM and RISC-V are unique in having support for
> + * semihosting support in linux-user. So for now we implement the
> + * common console API but just for arm and risc-v linux-user.
> *
> * SPDX-License-Identifier: GPL-2.0-or-later
> */
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 104632ea34..22b4d704b6 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -4186,10 +4186,10 @@ ERST
> DEF("semihosting", 0, QEMU_OPTION_semihosting,
> "-semihosting semihosting mode\n",
> QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
> - QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
> + QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
> SRST
> ``-semihosting``
> - Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II only).
> + Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V only).
>
> Note that this allows guest direct access to the host filesystem, so
> should only be used with a trusted guest OS.
> @@ -4201,10 +4201,10 @@ DEF("semihosting-config", HAS_ARG, QEMU_OPTION_semihosting_config,
> "-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]\n" \
> " semihosting configuration\n",
> QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
> -QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
> +QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
> SRST
> ``-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]``
> - Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II
> + Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V
> only).
>
> Note that this allows guest direct access to the host filesystem, so
> @@ -4219,6 +4219,8 @@ SRST
> open/read/write/seek/select. Tensilica baremetal libc for ISS and
> linux platform "sim" use this interface.
>
> + On RISC-V this implements the standard semihosting API, version 0.2.
> +
> ``target=native|gdb|auto``
> Defines where the semihosting calls will be addressed, to QEMU
> (``native``) or to GDB (``gdb``). The default is ``auto``, which
> diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
> index 24b24c69c5..f0d3d1c07e 100644
> --- a/target/riscv/cpu_bits.h
> +++ b/target/riscv/cpu_bits.h
> @@ -544,6 +544,7 @@
> #define RISCV_EXCP_INST_PAGE_FAULT 0xc /* since: priv-1.10.0 */
> #define RISCV_EXCP_LOAD_PAGE_FAULT 0xd /* since: priv-1.10.0 */
> #define RISCV_EXCP_STORE_PAGE_FAULT 0xf /* since: priv-1.10.0 */
> +#define RISCV_EXCP_SEMIHOST 0x10
> #define RISCV_EXCP_INST_GUEST_PAGE_FAULT 0x14
> #define RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT 0x15
> #define RISCV_EXCP_VIRT_INSTRUCTION_FAULT 0x16
> diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> index a2787b1d48..e730fd1fe9 100644
> --- a/target/riscv/cpu_helper.c
> +++ b/target/riscv/cpu_helper.c
> @@ -24,6 +24,7 @@
> #include "exec/exec-all.h"
> #include "tcg/tcg-op.h"
> #include "trace.h"
> +#include "hw/semihosting/common-semi.h"
>
> int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
> {
> @@ -844,6 +845,15 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> target_ulong htval = 0;
> target_ulong mtval2 = 0;
>
> + if (cause == RISCV_EXCP_SEMIHOST) {
> + if (env->priv >= PRV_S) {
> + env->gpr[xA0] = do_common_semihosting(cs);
> + env->pc += 4;
> + return;
> + }
> + cause = RISCV_EXCP_BREAKPOINT;
> + }
> +
> if (!async) {
> /* set tval to badaddr for traps with address information */
> switch (cause) {
> diff --git a/target/riscv/insn_trans/trans_privileged.c.inc b/target/riscv/insn_trans/trans_privileged.c.inc
> index 2a61a853bf..32312be202 100644
> --- a/target/riscv/insn_trans/trans_privileged.c.inc
> +++ b/target/riscv/insn_trans/trans_privileged.c.inc
> @@ -29,7 +29,42 @@ static bool trans_ecall(DisasContext *ctx, arg_ecall *a)
>
> static bool trans_ebreak(DisasContext *ctx, arg_ebreak *a)
> {
> - generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
> + target_ulong ebreak_addr = ctx->base.pc_next;
> + target_ulong pre_addr = ebreak_addr - 4;
> + target_ulong post_addr = ebreak_addr + 4;
> + uint32_t pre = 0;
> + uint32_t ebreak = 0;
> + uint32_t post = 0;
> +
> + /*
> + * The RISC-V semihosting spec specifies the following
> + * three-instruction sequence to flag a semihosting call:
> + *
> + * slli zero, zero, 0x1f 0x01f01013
> + * ebreak 0x00100073
> + * srai zero, zero, 0x7 0x40705013
> + *
> + * The two shift operations on the zero register are no-ops, used
> + * here to signify a semihosting exception, rather than a breakpoint.
> + *
> + * Uncompressed instructions are required so that the sequence is easy
> + * to validate.
> + *
> + * The three instructions are required to lie in the same page so
> + * that no exception will be raised when fetching them.
> + */
> +
> + if ((pre_addr & TARGET_PAGE_MASK) == (post_addr & TARGET_PAGE_MASK)) {
> + pre = opcode_at(&ctx->base, pre_addr);
> + ebreak = opcode_at(&ctx->base, ebreak_addr);
> + post = opcode_at(&ctx->base, post_addr);
> + }
> +
> + if (pre == 0x01f01013 && ebreak == 0x00100073 && post == 0x40705013) {
> + generate_exception(ctx, RISCV_EXCP_SEMIHOST);
> + } else {
> + generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
> + }
> exit_tb(ctx); /* no chaining */
> ctx->base.is_jmp = DISAS_NORETURN;
> return true;
> diff --git a/target/riscv/translate.c b/target/riscv/translate.c
> index 554d52a4be..0f28b5f41e 100644
> --- a/target/riscv/translate.c
> +++ b/target/riscv/translate.c
> @@ -64,6 +64,7 @@ typedef struct DisasContext {
> uint16_t vlen;
> uint16_t mlen;
> bool vl_eq_vlmax;
> + CPUState *cs;
> } DisasContext;
>
> #ifdef TARGET_RISCV64
> @@ -747,6 +748,15 @@ static bool gen_shift(DisasContext *ctx, arg_r *a,
> return true;
> }
>
> +static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
> +{
> + DisasContext *ctx = container_of(dcbase, DisasContext, base);
> + CPUState *cpu = ctx->cs;
> + CPURISCVState *env = cpu->env_ptr;
> +
> + return cpu_ldl_code(env, pc);
> +}
> +
> /* Include insn module translation function */
> #include "insn_trans/trans_rvi.c.inc"
> #include "insn_trans/trans_rvm.c.inc"
> @@ -814,6 +824,7 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
> ctx->lmul = FIELD_EX32(tb_flags, TB_FLAGS, LMUL);
> ctx->mlen = 1 << (ctx->sew + 3 - ctx->lmul);
> ctx->vl_eq_vlmax = FIELD_EX32(tb_flags, TB_FLAGS, VL_EQ_VLMAX);
> + ctx->cs = cs;
> }
>
> static void riscv_tr_tb_start(DisasContextBase *db, CPUState *cpu)
> --
> 2.29.2
>
>
[-- Attachment #2: 0001-riscv-Add-semihosting-support-for-user-mode.patch --]
[-- Type: application/x-patch, Size: 1247 bytes --]
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 5/8] riscv: Add semihosting support [v13]
@ 2020-12-09 7:58 ` Kito Cheng
0 siblings, 0 replies; 54+ messages in thread
From: Kito Cheng @ 2020-12-09 7:58 UTC (permalink / raw)
To: Keith Packard
Cc: qemu-devel, Alex Bennée, Alistair Francis,
Bastian Koppelmann, Laurent Vivier, Palmer Dabbelt,
Peter Maydell, qemu-arm, qemu-riscv, Sagar Karandikar
[-- Attachment #1: Type: text/plain, Size: 18017 bytes --]
Hi Keith:
Thanks for the patch, I've verified with newlib semihosting support
which is contributed by Craig Blackmore from embecosm,
and I would like to add semihosting to user mode, do you mind add this
patch into this patch series?
On Thu, Nov 26, 2020 at 5:41 AM Keith Packard via <qemu-riscv@nongnu.org> wrote:
>
> Adapt the arm semihosting support code for RISCV. This implementation
> is based on the standard for RISC-V semihosting version 0.2 as
> documented in
>
> https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
>
> Signed-off-by: Keith Packard <keithp@keithp.com>
>
> ---
>
> v2:
> Update PC after exception is handled to follow
> change in the ARM version for SYS_READC
>
> v3:
> Disallow semihosting in user mode; report a regular
> breakpoint in that case.
>
> v4:
> Fix errors reported by checkpatch
>
> v5:
> Reference current RISC-V semihosting specification
>
> v6:
> Add support for semihosting in riscv64-linux-user and
> riscv32-linux-user
>
> v7:
> Add meson build support
>
> v8:
> Fix errors reported by checkpatch that crept in.
>
> v9:
> Changes suggested by Alistair Francis <alistair23@gmail.com>:
> Don't add me to the MAINTAINERS file.
> Remove duplicate #include in target/riscv/cpu.h
> Reference RISC-V semihosting spec in target/riscv/riscv-semi.c
>
> v10:
> Use common semihosting implementation instead of a separate copy.
>
> Make sure addresses of the three breakpoint-signaling
> instructions all lie within the same page. Change suggested by
> Richard Henderson <richard.henderson@linaro.org>
>
> v11:
> Use CONFIG_ARM_COMPATIBLE_SEMIHOSTING
>
> v12:
> Fix bug in SYS_EXIT support on rv64
>
> v13:
> Add common_semi_rambase implementation. This locates the
> memory region containing the stack and uses the base of that.
>
> Fix SET_ARG and GET_ARG on rv64 targets to operate on 64-bit
> values rather than 32-bit. Put_user_ual/get_user_ual are
> confusingly defined by softmmu-semi.h as being equivalent to
> put_user_u32/get_user_u32.
> ---
> default-configs/devices/riscv32-softmmu.mak | 2 +
> default-configs/devices/riscv64-softmmu.mak | 2 +
> .../targets/riscv32-linux-user.mak | 1 +
> .../targets/riscv64-linux-user.mak | 1 +
> hw/semihosting/common-semi.c | 82 ++++++++++++++++++-
> hw/semihosting/common-semi.h | 5 +-
> linux-user/qemu.h | 4 +-
> linux-user/semihost.c | 8 +-
> qemu-options.hx | 10 ++-
> target/riscv/cpu_bits.h | 1 +
> target/riscv/cpu_helper.c | 10 +++
> .../riscv/insn_trans/trans_privileged.c.inc | 37 ++++++++-
> target/riscv/translate.c | 11 +++
> 13 files changed, 162 insertions(+), 12 deletions(-)
>
> diff --git a/default-configs/devices/riscv32-softmmu.mak b/default-configs/devices/riscv32-softmmu.mak
> index 94a236c9c2..d847bd5692 100644
> --- a/default-configs/devices/riscv32-softmmu.mak
> +++ b/default-configs/devices/riscv32-softmmu.mak
> @@ -3,6 +3,8 @@
> # Uncomment the following lines to disable these optional devices:
> #
> #CONFIG_PCI_DEVICES=n
> +CONFIG_SEMIHOSTING=y
> +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
>
> # Boards:
> #
> diff --git a/default-configs/devices/riscv64-softmmu.mak b/default-configs/devices/riscv64-softmmu.mak
> index 76b6195648..d5eec75f05 100644
> --- a/default-configs/devices/riscv64-softmmu.mak
> +++ b/default-configs/devices/riscv64-softmmu.mak
> @@ -3,6 +3,8 @@
> # Uncomment the following lines to disable these optional devices:
> #
> #CONFIG_PCI_DEVICES=n
> +CONFIG_SEMIHOSTING=y
> +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
>
> # Boards:
> #
> diff --git a/default-configs/targets/riscv32-linux-user.mak b/default-configs/targets/riscv32-linux-user.mak
> index dfb259e8aa..6a9d1b1bc1 100644
> --- a/default-configs/targets/riscv32-linux-user.mak
> +++ b/default-configs/targets/riscv32-linux-user.mak
> @@ -2,3 +2,4 @@ TARGET_ARCH=riscv32
> TARGET_BASE_ARCH=riscv
> TARGET_ABI_DIR=riscv
> TARGET_XML_FILES= gdb-xml/riscv-32bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-32bit-csr.xml gdb-xml/riscv-32bit-virtual.xml
> +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
> diff --git a/default-configs/targets/riscv64-linux-user.mak b/default-configs/targets/riscv64-linux-user.mak
> index b13895f3b0..0a92849a1b 100644
> --- a/default-configs/targets/riscv64-linux-user.mak
> +++ b/default-configs/targets/riscv64-linux-user.mak
> @@ -2,3 +2,4 @@ TARGET_ARCH=riscv64
> TARGET_BASE_ARCH=riscv
> TARGET_ABI_DIR=riscv
> TARGET_XML_FILES= gdb-xml/riscv-64bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-64bit-csr.xml gdb-xml/riscv-64bit-virtual.xml
> +CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
> diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
> index ddfa448cc2..2b6a3fd9fd 100644
> --- a/hw/semihosting/common-semi.c
> +++ b/hw/semihosting/common-semi.c
> @@ -1,6 +1,6 @@
> /*
> * Semihosting support for systems modeled on the Arm "Angel"
> - * semihosting syscalls design.
> + * semihosting syscalls design. This includes Arm and RISC-V processors
> *
> * Copyright (c) 2005, 2007 CodeSourcery.
> * Copyright (c) 2019 Linaro
> @@ -25,6 +25,10 @@
> * ARM Semihosting is documented in:
> * Semihosting for AArch32 and AArch64 Release 2.0
> * https://static.docs.arm.com/100863/0200/semihosting.pdf
> + *
> + * RISC-V Semihosting is documented in:
> + * RISC-V Semihosting
> + * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
> */
>
> #include "qemu/osdep.h"
> @@ -217,6 +221,42 @@ common_semi_rambase(CPUState *cs)
>
> #endif /* TARGET_ARM */
>
> +#ifdef TARGET_RISCV
> +static inline target_ulong
> +common_semi_arg(CPUState *cs, int argno)
> +{
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + CPURISCVState *env = &cpu->env;
> + return env->gpr[xA0 + argno];
> +}
> +
> +static inline void
> +common_semi_set_ret(CPUState *cs, target_ulong ret)
> +{
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + CPURISCVState *env = &cpu->env;
> + env->gpr[xA0] = ret;
> +}
> +
> +static inline bool
> +common_semi_sys_exit_extended(CPUState *cs, int nr)
> +{
> + return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
> +}
> +
> +#ifndef CONFIG_USER_ONLY
> +
> +static inline target_ulong
> +common_semi_rambase(CPUState *cs)
> +{
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + CPURISCVState *env = &cpu->env;
> + return common_semi_find_region_base(env->gpr[xSP]);
> +}
> +#endif
> +
> +#endif
> +
> /*
> * Allocate a new guest file descriptor and return it; if we
> * couldn't allocate a new fd then return -1.
> @@ -393,6 +433,12 @@ static target_ulong common_semi_flen_buf(CPUState *cs)
> sp = env->regs[13];
> }
> #endif
> +#ifdef TARGET_RISCV
> + RISCVCPU *cpu = RISCV_CPU(cs);
> + CPURISCVState *env = &cpu->env;
> +
> + sp = env->gpr[xSP];
> +#endif
>
> return sp - 64;
> }
> @@ -736,6 +782,37 @@ static const GuestFDFunctions guestfd_fns[] = {
> put_user_u32(val, args + (n) * 4))
> #endif
>
> +#ifdef TARGET_RISCV
> +
> +/*
> + * get_user_ual is defined as get_user_u32 in softmmu-semi.h,
> + * we need a macro that fetches a target_ulong
> + */
> +#define get_user_utl(arg, p) \
> + ((sizeof(target_ulong) == 8) ? \
> + get_user_u64(arg, p) : \
> + get_user_u32(arg, p))
> +
> +/*
> + * put_user_ual is defined as put_user_u32 in softmmu-semi.h,
> + * we need a macro that stores a target_ulong
> + */
> +#define put_user_utl(arg, p) \
> + ((sizeof(target_ulong) == 8) ? \
> + put_user_u64(arg, p) : \
> + put_user_u32(arg, p))
> +
> +#define GET_ARG(n) do { \
> + if (get_user_utl(arg ## n, args + (n) * sizeof(target_ulong))) { \
> + errno = EFAULT; \
> + return set_swi_errno(cs, -1); \
> + } \
> + } while (0)
> +
> +#define SET_ARG(n, val) \
> + put_user_utl(val, args + (n) * sizeof(target_ulong))
> +#endif
> +
> /*
> * Do a semihosting call.
> *
> @@ -1174,6 +1251,9 @@ target_ulong do_common_semihosting(CPUState *cs)
> if (is_a64(cs->env_ptr)) {
> return 0;
> }
> +#endif
> +#ifdef TARGET_RISCV
> + return 0;
> #endif
> /* fall through -- invalid for A32/T32 */
> default:
> diff --git a/hw/semihosting/common-semi.h b/hw/semihosting/common-semi.h
> index bc53e92c79..0bfab1c669 100644
> --- a/hw/semihosting/common-semi.h
> +++ b/hw/semihosting/common-semi.h
> @@ -1,6 +1,6 @@
> /*
> * Semihosting support for systems modeled on the Arm "Angel"
> - * semihosting syscalls design.
> + * semihosting syscalls design. This includes Arm and RISC-V processors
> *
> * Copyright (c) 2005, 2007 CodeSourcery.
> * Copyright (c) 2019 Linaro
> @@ -26,6 +26,9 @@
> * Semihosting for AArch32 and AArch64 Release 2.0
> * https://static.docs.arm.com/100863/0200/semihosting.pdf
> *
> + * RISC-V Semihosting is documented in:
> + * RISC-V Semihosting
> + * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
> */
>
> #ifndef COMMON_SEMI_H
> diff --git a/linux-user/qemu.h b/linux-user/qemu.h
> index 534753ca12..17aa992165 100644
> --- a/linux-user/qemu.h
> +++ b/linux-user/qemu.h
> @@ -109,6 +109,8 @@ typedef struct TaskState {
> /* FPA state */
> FPA11 fpa;
> # endif
> +#endif
> +#if defined(TARGET_ARM) || defined(TARGET_RISCV)
> int swi_errno;
> #endif
> #if defined(TARGET_I386) && !defined(TARGET_X86_64)
> @@ -122,7 +124,7 @@ typedef struct TaskState {
> #ifdef TARGET_M68K
> abi_ulong tp_value;
> #endif
> -#if defined(TARGET_ARM) || defined(TARGET_M68K)
> +#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV)
> /* Extra fields for semihosted binaries. */
> abi_ulong heap_base;
> abi_ulong heap_limit;
> diff --git a/linux-user/semihost.c b/linux-user/semihost.c
> index a1f0f6050e..c0015ee7f6 100644
> --- a/linux-user/semihost.c
> +++ b/linux-user/semihost.c
> @@ -1,11 +1,11 @@
> /*
> - * ARM Semihosting Console Support
> + * ARM Compatible Semihosting Console Support.
> *
> * Copyright (c) 2019 Linaro Ltd
> *
> - * Currently ARM is unique in having support for semihosting support
> - * in linux-user. So for now we implement the common console API but
> - * just for arm linux-user.
> + * Currently ARM and RISC-V are unique in having support for
> + * semihosting support in linux-user. So for now we implement the
> + * common console API but just for arm and risc-v linux-user.
> *
> * SPDX-License-Identifier: GPL-2.0-or-later
> */
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 104632ea34..22b4d704b6 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -4186,10 +4186,10 @@ ERST
> DEF("semihosting", 0, QEMU_OPTION_semihosting,
> "-semihosting semihosting mode\n",
> QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
> - QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
> + QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
> SRST
> ``-semihosting``
> - Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II only).
> + Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V only).
>
> Note that this allows guest direct access to the host filesystem, so
> should only be used with a trusted guest OS.
> @@ -4201,10 +4201,10 @@ DEF("semihosting-config", HAS_ARG, QEMU_OPTION_semihosting_config,
> "-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]\n" \
> " semihosting configuration\n",
> QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
> -QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
> +QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
> SRST
> ``-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]``
> - Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II
> + Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V
> only).
>
> Note that this allows guest direct access to the host filesystem, so
> @@ -4219,6 +4219,8 @@ SRST
> open/read/write/seek/select. Tensilica baremetal libc for ISS and
> linux platform "sim" use this interface.
>
> + On RISC-V this implements the standard semihosting API, version 0.2.
> +
> ``target=native|gdb|auto``
> Defines where the semihosting calls will be addressed, to QEMU
> (``native``) or to GDB (``gdb``). The default is ``auto``, which
> diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
> index 24b24c69c5..f0d3d1c07e 100644
> --- a/target/riscv/cpu_bits.h
> +++ b/target/riscv/cpu_bits.h
> @@ -544,6 +544,7 @@
> #define RISCV_EXCP_INST_PAGE_FAULT 0xc /* since: priv-1.10.0 */
> #define RISCV_EXCP_LOAD_PAGE_FAULT 0xd /* since: priv-1.10.0 */
> #define RISCV_EXCP_STORE_PAGE_FAULT 0xf /* since: priv-1.10.0 */
> +#define RISCV_EXCP_SEMIHOST 0x10
> #define RISCV_EXCP_INST_GUEST_PAGE_FAULT 0x14
> #define RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT 0x15
> #define RISCV_EXCP_VIRT_INSTRUCTION_FAULT 0x16
> diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> index a2787b1d48..e730fd1fe9 100644
> --- a/target/riscv/cpu_helper.c
> +++ b/target/riscv/cpu_helper.c
> @@ -24,6 +24,7 @@
> #include "exec/exec-all.h"
> #include "tcg/tcg-op.h"
> #include "trace.h"
> +#include "hw/semihosting/common-semi.h"
>
> int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
> {
> @@ -844,6 +845,15 @@ void riscv_cpu_do_interrupt(CPUState *cs)
> target_ulong htval = 0;
> target_ulong mtval2 = 0;
>
> + if (cause == RISCV_EXCP_SEMIHOST) {
> + if (env->priv >= PRV_S) {
> + env->gpr[xA0] = do_common_semihosting(cs);
> + env->pc += 4;
> + return;
> + }
> + cause = RISCV_EXCP_BREAKPOINT;
> + }
> +
> if (!async) {
> /* set tval to badaddr for traps with address information */
> switch (cause) {
> diff --git a/target/riscv/insn_trans/trans_privileged.c.inc b/target/riscv/insn_trans/trans_privileged.c.inc
> index 2a61a853bf..32312be202 100644
> --- a/target/riscv/insn_trans/trans_privileged.c.inc
> +++ b/target/riscv/insn_trans/trans_privileged.c.inc
> @@ -29,7 +29,42 @@ static bool trans_ecall(DisasContext *ctx, arg_ecall *a)
>
> static bool trans_ebreak(DisasContext *ctx, arg_ebreak *a)
> {
> - generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
> + target_ulong ebreak_addr = ctx->base.pc_next;
> + target_ulong pre_addr = ebreak_addr - 4;
> + target_ulong post_addr = ebreak_addr + 4;
> + uint32_t pre = 0;
> + uint32_t ebreak = 0;
> + uint32_t post = 0;
> +
> + /*
> + * The RISC-V semihosting spec specifies the following
> + * three-instruction sequence to flag a semihosting call:
> + *
> + * slli zero, zero, 0x1f 0x01f01013
> + * ebreak 0x00100073
> + * srai zero, zero, 0x7 0x40705013
> + *
> + * The two shift operations on the zero register are no-ops, used
> + * here to signify a semihosting exception, rather than a breakpoint.
> + *
> + * Uncompressed instructions are required so that the sequence is easy
> + * to validate.
> + *
> + * The three instructions are required to lie in the same page so
> + * that no exception will be raised when fetching them.
> + */
> +
> + if ((pre_addr & TARGET_PAGE_MASK) == (post_addr & TARGET_PAGE_MASK)) {
> + pre = opcode_at(&ctx->base, pre_addr);
> + ebreak = opcode_at(&ctx->base, ebreak_addr);
> + post = opcode_at(&ctx->base, post_addr);
> + }
> +
> + if (pre == 0x01f01013 && ebreak == 0x00100073 && post == 0x40705013) {
> + generate_exception(ctx, RISCV_EXCP_SEMIHOST);
> + } else {
> + generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
> + }
> exit_tb(ctx); /* no chaining */
> ctx->base.is_jmp = DISAS_NORETURN;
> return true;
> diff --git a/target/riscv/translate.c b/target/riscv/translate.c
> index 554d52a4be..0f28b5f41e 100644
> --- a/target/riscv/translate.c
> +++ b/target/riscv/translate.c
> @@ -64,6 +64,7 @@ typedef struct DisasContext {
> uint16_t vlen;
> uint16_t mlen;
> bool vl_eq_vlmax;
> + CPUState *cs;
> } DisasContext;
>
> #ifdef TARGET_RISCV64
> @@ -747,6 +748,15 @@ static bool gen_shift(DisasContext *ctx, arg_r *a,
> return true;
> }
>
> +static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
> +{
> + DisasContext *ctx = container_of(dcbase, DisasContext, base);
> + CPUState *cpu = ctx->cs;
> + CPURISCVState *env = cpu->env_ptr;
> +
> + return cpu_ldl_code(env, pc);
> +}
> +
> /* Include insn module translation function */
> #include "insn_trans/trans_rvi.c.inc"
> #include "insn_trans/trans_rvm.c.inc"
> @@ -814,6 +824,7 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
> ctx->lmul = FIELD_EX32(tb_flags, TB_FLAGS, LMUL);
> ctx->mlen = 1 << (ctx->sew + 3 - ctx->lmul);
> ctx->vl_eq_vlmax = FIELD_EX32(tb_flags, TB_FLAGS, VL_EQ_VLMAX);
> + ctx->cs = cs;
> }
>
> static void riscv_tr_tb_start(DisasContextBase *db, CPUState *cpu)
> --
> 2.29.2
>
>
[-- Attachment #2: 0001-riscv-Add-semihosting-support-for-user-mode.patch --]
[-- Type: application/x-patch, Size: 1247 bytes --]
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 5/8] riscv: Add semihosting support [v13]
2020-12-09 7:58 ` Kito Cheng
@ 2020-12-09 16:29 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-09 16:29 UTC (permalink / raw)
To: Kito Cheng
Cc: qemu-devel, Alex Bennée, Alistair Francis,
Bastian Koppelmann, Laurent Vivier, Palmer Dabbelt,
Peter Maydell, qemu-arm, qemu-riscv, Sagar Karandikar
[-- Attachment #1: Type: text/plain, Size: 495 bytes --]
Kito Cheng <kito.cheng@gmail.com> writes:
> Hi Keith:
>
> Thanks for the patch, I've verified with newlib semihosting support
> which is contributed by Craig Blackmore from embecosm,
> and I would like to add semihosting to user mode, do you mind add this
> patch into this patch series?
I tried to add that already, but I admit that I haven't tested it in a
while. You should find that there are patches to linux-user/semihost.c
and linux-user/qemu.h to enable it.
--
-keith
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 832 bytes --]
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 5/8] riscv: Add semihosting support [v13]
@ 2020-12-09 16:29 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-09 16:29 UTC (permalink / raw)
To: Kito Cheng
Cc: qemu-devel, Alex Bennée, Alistair Francis,
Bastian Koppelmann, Laurent Vivier, Palmer Dabbelt,
Peter Maydell, qemu-arm, qemu-riscv, Sagar Karandikar
[-- Attachment #1: Type: text/plain, Size: 495 bytes --]
Kito Cheng <kito.cheng@gmail.com> writes:
> Hi Keith:
>
> Thanks for the patch, I've verified with newlib semihosting support
> which is contributed by Craig Blackmore from embecosm,
> and I would like to add semihosting to user mode, do you mind add this
> patch into this patch series?
I tried to add that already, but I admit that I haven't tested it in a
while. You should find that there are patches to linux-user/semihost.c
and linux-user/qemu.h to enable it.
--
-keith
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 832 bytes --]
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 5/8] riscv: Add semihosting support [v13]
2020-12-09 16:29 ` Keith Packard
@ 2020-12-10 3:39 ` Kito Cheng
-1 siblings, 0 replies; 54+ messages in thread
From: Kito Cheng @ 2020-12-10 3:39 UTC (permalink / raw)
To: Keith Packard
Cc: Peter Maydell, qemu-riscv, Sagar Karandikar, Bastian Koppelmann,
Laurent Vivier, qemu-devel, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
Hi Keith:
Thanks for your reply, but it seems like we need some more modification in
linux-user/riscv/cpu_loop.c to enable that, I guess I should post that in mail
rather than attachment :)
Patch here:
From 2f1eb5825a6dda177d3289106970eab05cb08445 Mon Sep 17 00:00:00 2001
From: Kito Cheng <kito.cheng@sifive.com>
Date: Wed, 9 Dec 2020 14:24:51 +0800
Subject: [PATCH] riscv: Add semihosting support for user mode
This could make testing easier and ARM/AArch64 has support on
their linux user mode too, so I think it should be reasonable.
Verified GCC testsuite with newlib/semihosting.
Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
---
linux-user/riscv/cpu_loop.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c
index aa9e437875..9665dabb09 100644
--- a/linux-user/riscv/cpu_loop.c
+++ b/linux-user/riscv/cpu_loop.c
@@ -23,6 +23,7 @@
#include "qemu.h"
#include "cpu_loop-common.h"
#include "elf.h"
+#include "hw/semihosting/common-semi.h"
void cpu_loop(CPURISCVState *env)
{
@@ -91,6 +92,10 @@ void cpu_loop(CPURISCVState *env)
sigcode = TARGET_SEGV_MAPERR;
sigaddr = env->badaddr;
break;
+ case RISCV_EXCP_SEMIHOST:
+ env->gpr[xA0] = do_common_semihosting(cs);
+ env->pc += 4;
+ break;
case EXCP_DEBUG:
gdbstep:
signum = TARGET_SIGTRAP;
--
2.29.2
On Thu, Dec 10, 2020 at 12:30 AM Keith Packard via
<qemu-devel@nongnu.org> wrote:
>
> Kito Cheng <kito.cheng@gmail.com> writes:
>
> > Hi Keith:
> >
> > Thanks for the patch, I've verified with newlib semihosting support
> > which is contributed by Craig Blackmore from embecosm,
> > and I would like to add semihosting to user mode, do you mind add this
> > patch into this patch series?
>
> I tried to add that already, but I admit that I haven't tested it in a
> while. You should find that there are patches to linux-user/semihost.c
> and linux-user/qemu.h to enable it.
>
> --
> -keith
^ permalink raw reply related [flat|nested] 54+ messages in thread
* Re: [PATCH 5/8] riscv: Add semihosting support [v13]
@ 2020-12-10 3:39 ` Kito Cheng
0 siblings, 0 replies; 54+ messages in thread
From: Kito Cheng @ 2020-12-10 3:39 UTC (permalink / raw)
To: Keith Packard
Cc: qemu-devel, Alex Bennée, Alistair Francis,
Bastian Koppelmann, Laurent Vivier, Palmer Dabbelt,
Peter Maydell, qemu-arm, qemu-riscv, Sagar Karandikar
Hi Keith:
Thanks for your reply, but it seems like we need some more modification in
linux-user/riscv/cpu_loop.c to enable that, I guess I should post that in mail
rather than attachment :)
Patch here:
From 2f1eb5825a6dda177d3289106970eab05cb08445 Mon Sep 17 00:00:00 2001
From: Kito Cheng <kito.cheng@sifive.com>
Date: Wed, 9 Dec 2020 14:24:51 +0800
Subject: [PATCH] riscv: Add semihosting support for user mode
This could make testing easier and ARM/AArch64 has support on
their linux user mode too, so I think it should be reasonable.
Verified GCC testsuite with newlib/semihosting.
Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
---
linux-user/riscv/cpu_loop.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c
index aa9e437875..9665dabb09 100644
--- a/linux-user/riscv/cpu_loop.c
+++ b/linux-user/riscv/cpu_loop.c
@@ -23,6 +23,7 @@
#include "qemu.h"
#include "cpu_loop-common.h"
#include "elf.h"
+#include "hw/semihosting/common-semi.h"
void cpu_loop(CPURISCVState *env)
{
@@ -91,6 +92,10 @@ void cpu_loop(CPURISCVState *env)
sigcode = TARGET_SEGV_MAPERR;
sigaddr = env->badaddr;
break;
+ case RISCV_EXCP_SEMIHOST:
+ env->gpr[xA0] = do_common_semihosting(cs);
+ env->pc += 4;
+ break;
case EXCP_DEBUG:
gdbstep:
signum = TARGET_SIGTRAP;
--
2.29.2
On Thu, Dec 10, 2020 at 12:30 AM Keith Packard via
<qemu-devel@nongnu.org> wrote:
>
> Kito Cheng <kito.cheng@gmail.com> writes:
>
> > Hi Keith:
> >
> > Thanks for the patch, I've verified with newlib semihosting support
> > which is contributed by Craig Blackmore from embecosm,
> > and I would like to add semihosting to user mode, do you mind add this
> > patch into this patch series?
>
> I tried to add that already, but I admit that I haven't tested it in a
> while. You should find that there are patches to linux-user/semihost.c
> and linux-user/qemu.h to enable it.
>
> --
> -keith
^ permalink raw reply related [flat|nested] 54+ messages in thread
* Re: [PATCH 5/8] riscv: Add semihosting support [v13]
2020-12-10 3:39 ` Kito Cheng
@ 2020-12-10 6:21 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-10 6:21 UTC (permalink / raw)
To: Kito Cheng
Cc: Peter Maydell, qemu-riscv, Sagar Karandikar, Bastian Koppelmann,
Laurent Vivier, qemu-devel, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
[-- Attachment #1: Type: text/plain, Size: 762 bytes --]
Kito Cheng <kito.cheng@gmail.com> writes:
> Hi Keith:
>
> Thanks for your reply, but it seems like we need some more modification in
> linux-user/riscv/cpu_loop.c to enable that, I guess I should post that in mail
> rather than attachment :)
Ah, I completely missed the attachment! So sorry. That applies cleanly
on top of the rest of my series, so I think we can just leave it like
that unless someone wants it presented differently. Not sure why I
thought this was working before; I clearly missed the most important
bit.
Reviewed-by: Keith Packard <keithp@keithp.com>
I've got a github repo with these bits in case anyone wants to look at
the whole tree:
https://github.com/keith-packard/qemu/tree/semihosting
--
-keith
[-- Attachment #2: signature.asc --]
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^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 5/8] riscv: Add semihosting support [v13]
@ 2020-12-10 6:21 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-10 6:21 UTC (permalink / raw)
To: Kito Cheng
Cc: qemu-devel, Alex Bennée, Alistair Francis,
Bastian Koppelmann, Laurent Vivier, Palmer Dabbelt,
Peter Maydell, qemu-arm, qemu-riscv, Sagar Karandikar
[-- Attachment #1: Type: text/plain, Size: 762 bytes --]
Kito Cheng <kito.cheng@gmail.com> writes:
> Hi Keith:
>
> Thanks for your reply, but it seems like we need some more modification in
> linux-user/riscv/cpu_loop.c to enable that, I guess I should post that in mail
> rather than attachment :)
Ah, I completely missed the attachment! So sorry. That applies cleanly
on top of the rest of my series, so I think we can just leave it like
that unless someone wants it presented differently. Not sure why I
thought this was working before; I clearly missed the most important
bit.
Reviewed-by: Keith Packard <keithp@keithp.com>
I've got a github repo with these bits in case anyone wants to look at
the whole tree:
https://github.com/keith-packard/qemu/tree/semihosting
--
-keith
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 832 bytes --]
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
2020-11-25 21:36 ` Keith Packard
@ 2020-12-14 11:24 ` Alex Bennée
-1 siblings, 0 replies; 54+ messages in thread
From: Alex Bennée @ 2020-12-14 11:24 UTC (permalink / raw)
To: Keith Packard
Cc: Peter Maydell, qemu-riscv, Sagar Karandikar, Bastian Koppelmann,
qemu-devel, Laurent Vivier, qemu-arm, Palmer Dabbelt,
Alistair Francis
Keith Packard <keithp@keithp.com> writes:
> This series adds support for RISC-V Semihosting, version 0.2 as
> specified here:
>
> https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
>
> This specification references the ARM semihosting release 2.0 as specified here:
>
> https://static.docs.arm.com/100863/0200/semihosting.pdf
>
> That specification includes several semihosting calls which were not
> previously implemented. This series includes implementations for the
> remaining calls so that both RISC-V and ARM versions are now complete.
>
> Tests for release 2.0 can be found in picolibc on the semihost-2.0-all
> branch:
>
> https://github.com/picolibc/picolibc/tree/semihost-2.0-all
>
> These tests uncovered a bug in the SYS_HEAPINFO implementation for
> ARM, which has been fixed in this series as well.
>
> The series is structured as follows:
>
> 1. Move shared semihosting files
> 2. Change public common semihosting APIs
> 3. Change internal semihosting interfaces
> 4. Fix SYS_HEAPINFO crash on ARM
> 5. Add RISC-V semihosting implementation
> 6-8. Add missing semihosting operations from release 2.0
>
> Signed-off-by: Keith Packard <keithp@keithp.com>
Queued to semihosting/next, thanks.
--
Alex Bennée
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
@ 2020-12-14 11:24 ` Alex Bennée
0 siblings, 0 replies; 54+ messages in thread
From: Alex Bennée @ 2020-12-14 11:24 UTC (permalink / raw)
To: Keith Packard
Cc: qemu-devel, Alistair Francis, Bastian Koppelmann, Laurent Vivier,
Palmer Dabbelt, Peter Maydell, qemu-arm, qemu-riscv,
Sagar Karandikar
Keith Packard <keithp@keithp.com> writes:
> This series adds support for RISC-V Semihosting, version 0.2 as
> specified here:
>
> https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
>
> This specification references the ARM semihosting release 2.0 as specified here:
>
> https://static.docs.arm.com/100863/0200/semihosting.pdf
>
> That specification includes several semihosting calls which were not
> previously implemented. This series includes implementations for the
> remaining calls so that both RISC-V and ARM versions are now complete.
>
> Tests for release 2.0 can be found in picolibc on the semihost-2.0-all
> branch:
>
> https://github.com/picolibc/picolibc/tree/semihost-2.0-all
>
> These tests uncovered a bug in the SYS_HEAPINFO implementation for
> ARM, which has been fixed in this series as well.
>
> The series is structured as follows:
>
> 1. Move shared semihosting files
> 2. Change public common semihosting APIs
> 3. Change internal semihosting interfaces
> 4. Fix SYS_HEAPINFO crash on ARM
> 5. Add RISC-V semihosting implementation
> 6-8. Add missing semihosting operations from release 2.0
>
> Signed-off-by: Keith Packard <keithp@keithp.com>
Queued to semihosting/next, thanks.
--
Alex Bennée
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 5/8] riscv: Add semihosting support [v13]
2020-12-10 3:39 ` Kito Cheng
@ 2020-12-14 11:29 ` Alex Bennée
-1 siblings, 0 replies; 54+ messages in thread
From: Alex Bennée @ 2020-12-14 11:29 UTC (permalink / raw)
To: Kito Cheng
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, qemu-devel, Laurent Vivier, qemu-arm,
Palmer Dabbelt, Alistair Francis
Kito Cheng <kito.cheng@gmail.com> writes:
> Hi Keith:
>
> Thanks for your reply, but it seems like we need some more modification in
> linux-user/riscv/cpu_loop.c to enable that, I guess I should post that in mail
> rather than attachment :)
>
> Patch here:
>
> From 2f1eb5825a6dda177d3289106970eab05cb08445 Mon Sep 17 00:00:00 2001
> From: Kito Cheng <kito.cheng@sifive.com>
> Date: Wed, 9 Dec 2020 14:24:51 +0800
> Subject: [PATCH] riscv: Add semihosting support for user mode
>
> This could make testing easier and ARM/AArch64 has support on
> their linux user mode too, so I think it should be reasonable.
>
> Verified GCC testsuite with newlib/semihosting.
>
> Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
If the riscv linux-user maintainer is happy with it I'll take it through
semihosting/next. It certainly has a use case in the ARM case.
> ---
> linux-user/riscv/cpu_loop.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c
> index aa9e437875..9665dabb09 100644
> --- a/linux-user/riscv/cpu_loop.c
> +++ b/linux-user/riscv/cpu_loop.c
> @@ -23,6 +23,7 @@
> #include "qemu.h"
> #include "cpu_loop-common.h"
> #include "elf.h"
> +#include "hw/semihosting/common-semi.h"
>
> void cpu_loop(CPURISCVState *env)
> {
> @@ -91,6 +92,10 @@ void cpu_loop(CPURISCVState *env)
> sigcode = TARGET_SEGV_MAPERR;
> sigaddr = env->badaddr;
> break;
> + case RISCV_EXCP_SEMIHOST:
> + env->gpr[xA0] = do_common_semihosting(cs);
> + env->pc += 4;
> + break;
> case EXCP_DEBUG:
> gdbstep:
> signum = TARGET_SIGTRAP;
--
Alex Bennée
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 5/8] riscv: Add semihosting support [v13]
@ 2020-12-14 11:29 ` Alex Bennée
0 siblings, 0 replies; 54+ messages in thread
From: Alex Bennée @ 2020-12-14 11:29 UTC (permalink / raw)
To: Kito Cheng
Cc: Keith Packard, qemu-devel, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar
Kito Cheng <kito.cheng@gmail.com> writes:
> Hi Keith:
>
> Thanks for your reply, but it seems like we need some more modification in
> linux-user/riscv/cpu_loop.c to enable that, I guess I should post that in mail
> rather than attachment :)
>
> Patch here:
>
> From 2f1eb5825a6dda177d3289106970eab05cb08445 Mon Sep 17 00:00:00 2001
> From: Kito Cheng <kito.cheng@sifive.com>
> Date: Wed, 9 Dec 2020 14:24:51 +0800
> Subject: [PATCH] riscv: Add semihosting support for user mode
>
> This could make testing easier and ARM/AArch64 has support on
> their linux user mode too, so I think it should be reasonable.
>
> Verified GCC testsuite with newlib/semihosting.
>
> Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
If the riscv linux-user maintainer is happy with it I'll take it through
semihosting/next. It certainly has a use case in the ARM case.
> ---
> linux-user/riscv/cpu_loop.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c
> index aa9e437875..9665dabb09 100644
> --- a/linux-user/riscv/cpu_loop.c
> +++ b/linux-user/riscv/cpu_loop.c
> @@ -23,6 +23,7 @@
> #include "qemu.h"
> #include "cpu_loop-common.h"
> #include "elf.h"
> +#include "hw/semihosting/common-semi.h"
>
> void cpu_loop(CPURISCVState *env)
> {
> @@ -91,6 +92,10 @@ void cpu_loop(CPURISCVState *env)
> sigcode = TARGET_SEGV_MAPERR;
> sigaddr = env->badaddr;
> break;
> + case RISCV_EXCP_SEMIHOST:
> + env->gpr[xA0] = do_common_semihosting(cs);
> + env->pc += 4;
> + break;
> case EXCP_DEBUG:
> gdbstep:
> signum = TARGET_SIGTRAP;
--
Alex Bennée
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
2020-12-14 11:24 ` Alex Bennée
@ 2020-12-14 14:58 ` Alex Bennée
-1 siblings, 0 replies; 54+ messages in thread
From: Alex Bennée @ 2020-12-14 14:58 UTC (permalink / raw)
To: Keith Packard
Cc: Peter Maydell, qemu-riscv, Sagar Karandikar, Bastian Koppelmann,
qemu-devel, Laurent Vivier, qemu-arm, Palmer Dabbelt,
Alistair Francis
Alex Bennée <alex.bennee@linaro.org> writes:
> Keith Packard <keithp@keithp.com> writes:
>
>> This series adds support for RISC-V Semihosting, version 0.2 as
>> specified here:
>>
>> https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
>>
>> This specification references the ARM semihosting release 2.0 as specified here:
>>
>> https://static.docs.arm.com/100863/0200/semihosting.pdf
>>
>> That specification includes several semihosting calls which were not
>> previously implemented. This series includes implementations for the
>> remaining calls so that both RISC-V and ARM versions are now complete.
>>
>> Tests for release 2.0 can be found in picolibc on the semihost-2.0-all
>> branch:
>>
>> https://github.com/picolibc/picolibc/tree/semihost-2.0-all
>>
>> These tests uncovered a bug in the SYS_HEAPINFO implementation for
>> ARM, which has been fixed in this series as well.
>>
>> The series is structured as follows:
>>
>> 1. Move shared semihosting files
>> 2. Change public common semihosting APIs
>> 3. Change internal semihosting interfaces
>> 4. Fix SYS_HEAPINFO crash on ARM
>> 5. Add RISC-V semihosting implementation
>> 6-8. Add missing semihosting operations from release 2.0
>>
>> Signed-off-by: Keith Packard <keithp@keithp.com>
>
> Queued to semihosting/next, thanks.
Hmm scratch that... it fails in a number of linux-user only builds with:
/usr/bin/ld: libqemu-aarch64_be-linux-user.fa.p/linux-user_aarch64_cpu_loop.c.o: in function `cpu_loop':
/builds/stsquad/qemu/build/../linux-user/aarch64/cpu_loop.c:133: undefined reference to `do_common_semihosting'
collect2: error: ld returned 1 exit status
[651/2871] Compiling C object libqemu-alpha-linux-user.fa.p/target_alpha_translate.c.o
ninja: build stopped: subcommand failed.
As well as a chunk of the various cross builds, see:
https://gitlab.com/stsquad/qemu/-/pipelines/229443833/failures
On the next re-spin could you include Kito Cheng's patch for linux-user
support and also drop the version numbering from the commit titles so I
don't have to file them off again.
Thanks,
--
Alex Bennée
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
@ 2020-12-14 14:58 ` Alex Bennée
0 siblings, 0 replies; 54+ messages in thread
From: Alex Bennée @ 2020-12-14 14:58 UTC (permalink / raw)
To: Keith Packard
Cc: qemu-devel, Alistair Francis, Bastian Koppelmann, Laurent Vivier,
Palmer Dabbelt, Peter Maydell, qemu-arm, qemu-riscv,
Sagar Karandikar
Alex Bennée <alex.bennee@linaro.org> writes:
> Keith Packard <keithp@keithp.com> writes:
>
>> This series adds support for RISC-V Semihosting, version 0.2 as
>> specified here:
>>
>> https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
>>
>> This specification references the ARM semihosting release 2.0 as specified here:
>>
>> https://static.docs.arm.com/100863/0200/semihosting.pdf
>>
>> That specification includes several semihosting calls which were not
>> previously implemented. This series includes implementations for the
>> remaining calls so that both RISC-V and ARM versions are now complete.
>>
>> Tests for release 2.0 can be found in picolibc on the semihost-2.0-all
>> branch:
>>
>> https://github.com/picolibc/picolibc/tree/semihost-2.0-all
>>
>> These tests uncovered a bug in the SYS_HEAPINFO implementation for
>> ARM, which has been fixed in this series as well.
>>
>> The series is structured as follows:
>>
>> 1. Move shared semihosting files
>> 2. Change public common semihosting APIs
>> 3. Change internal semihosting interfaces
>> 4. Fix SYS_HEAPINFO crash on ARM
>> 5. Add RISC-V semihosting implementation
>> 6-8. Add missing semihosting operations from release 2.0
>>
>> Signed-off-by: Keith Packard <keithp@keithp.com>
>
> Queued to semihosting/next, thanks.
Hmm scratch that... it fails in a number of linux-user only builds with:
/usr/bin/ld: libqemu-aarch64_be-linux-user.fa.p/linux-user_aarch64_cpu_loop.c.o: in function `cpu_loop':
/builds/stsquad/qemu/build/../linux-user/aarch64/cpu_loop.c:133: undefined reference to `do_common_semihosting'
collect2: error: ld returned 1 exit status
[651/2871] Compiling C object libqemu-alpha-linux-user.fa.p/target_alpha_translate.c.o
ninja: build stopped: subcommand failed.
As well as a chunk of the various cross builds, see:
https://gitlab.com/stsquad/qemu/-/pipelines/229443833/failures
On the next re-spin could you include Kito Cheng's patch for linux-user
support and also drop the version numbering from the commit titles so I
don't have to file them off again.
Thanks,
--
Alex Bennée
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
2020-12-14 14:58 ` Alex Bennée
@ 2020-12-14 20:06 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:06 UTC (permalink / raw)
To: Alex Bennée
Cc: Peter Maydell, qemu-riscv, Sagar Karandikar, Bastian Koppelmann,
qemu-devel, Laurent Vivier, qemu-arm, Palmer Dabbelt,
Alistair Francis
[-- Attachment #1: Type: text/plain, Size: 1248 bytes --]
Alex Bennée <alex.bennee@linaro.org> writes:
> Hmm scratch that... it fails in a number of linux-user only builds with:
>
> /usr/bin/ld: libqemu-aarch64_be-linux-user.fa.p/linux-user_aarch64_cpu_loop.c.o: in function `cpu_loop':
> /builds/stsquad/qemu/build/../linux-user/aarch64/cpu_loop.c:133: undefined reference to `do_common_semihosting'
> collect2: error: ld returned 1 exit status
> [651/2871] Compiling C object libqemu-alpha-linux-user.fa.p/target_alpha_translate.c.o
> ninja: build stopped: subcommand failed.
I missed changing default-configs/targets/aarch64_be-linux-user.mak.
> https://gitlab.com/stsquad/qemu/-/pipelines/229443833/failures
Some of these were caused by a missing explicit cast to Int128, which is
needed on hosts without compiler support for 128-bit ints. The rest
app to have been the same problem with aarch64_be-linux-user.
> On the next re-spin could you include Kito Cheng's patch for linux-user
> support and also drop the version numbering from the commit titles so I
> don't have to file them off again.
Yup, all done. Thanks much for the review and for getting these tests
run. I've rebased on current master and fixed the problems identified
above.
--
-keith
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 832 bytes --]
^ permalink raw reply [flat|nested] 54+ messages in thread
* Re: [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
@ 2020-12-14 20:06 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:06 UTC (permalink / raw)
To: Alex Bennée
Cc: qemu-devel, Alistair Francis, Bastian Koppelmann, Laurent Vivier,
Palmer Dabbelt, Peter Maydell, qemu-arm, qemu-riscv,
Sagar Karandikar
[-- Attachment #1: Type: text/plain, Size: 1248 bytes --]
Alex Bennée <alex.bennee@linaro.org> writes:
> Hmm scratch that... it fails in a number of linux-user only builds with:
>
> /usr/bin/ld: libqemu-aarch64_be-linux-user.fa.p/linux-user_aarch64_cpu_loop.c.o: in function `cpu_loop':
> /builds/stsquad/qemu/build/../linux-user/aarch64/cpu_loop.c:133: undefined reference to `do_common_semihosting'
> collect2: error: ld returned 1 exit status
> [651/2871] Compiling C object libqemu-alpha-linux-user.fa.p/target_alpha_translate.c.o
> ninja: build stopped: subcommand failed.
I missed changing default-configs/targets/aarch64_be-linux-user.mak.
> https://gitlab.com/stsquad/qemu/-/pipelines/229443833/failures
Some of these were caused by a missing explicit cast to Int128, which is
needed on hosts without compiler support for 128-bit ints. The rest
app to have been the same problem with aarch64_be-linux-user.
> On the next re-spin could you include Kito Cheng's patch for linux-user
> support and also drop the version numbering from the commit titles so I
> don't have to file them off again.
Yup, all done. Thanks much for the review and for getting these tests
run. I've rebased on current master and fixed the problems identified
above.
--
-keith
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 832 bytes --]
^ permalink raw reply [flat|nested] 54+ messages in thread
* [PATCH 0/9] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
2020-12-14 14:58 ` Alex Bennée
@ 2020-12-14 20:07 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, Laurent Vivier, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
This series adds support for RISC-V Semihosting, version 0.2 as
specified here:
https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
This specification references the ARM semihosting release 2.0 as specified here:
https://static.docs.arm.com/100863/0200/semihosting.pdf
That specification includes several semihosting calls which were not
previously implemented. This series includes implementations for the
remaining calls so that both RISC-V and ARM versions are now complete.
Tests for release 2.0 can be found in picolibc on the semihost-2.0-all
branch:
https://github.com/picolibc/picolibc/tree/semihost-2.0-all
These tests uncovered a bug in the SYS_HEAPINFO implementation for
ARM, which has been fixed in this series as well.
The series is structured as follows:
1. Move shared semihosting files
2. Change public common semihosting APIs
3. Change internal semihosting interfaces
4. Fix SYS_HEAPINFO crash on ARM
5-6. Add RISC-V semihosting implementation
7-9. Add missing semihosting operations from release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
^ permalink raw reply [flat|nested] 54+ messages in thread
* [PATCH 0/9] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
@ 2020-12-14 20:07 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
This series adds support for RISC-V Semihosting, version 0.2 as
specified here:
https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
This specification references the ARM semihosting release 2.0 as specified here:
https://static.docs.arm.com/100863/0200/semihosting.pdf
That specification includes several semihosting calls which were not
previously implemented. This series includes implementations for the
remaining calls so that both RISC-V and ARM versions are now complete.
Tests for release 2.0 can be found in picolibc on the semihost-2.0-all
branch:
https://github.com/picolibc/picolibc/tree/semihost-2.0-all
These tests uncovered a bug in the SYS_HEAPINFO implementation for
ARM, which has been fixed in this series as well.
The series is structured as follows:
1. Move shared semihosting files
2. Change public common semihosting APIs
3. Change internal semihosting interfaces
4. Fix SYS_HEAPINFO crash on ARM
5-6. Add RISC-V semihosting implementation
7-9. Add missing semihosting operations from release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
^ permalink raw reply [flat|nested] 54+ messages in thread
* [PATCH 1/9] semihosting: Move ARM semihosting code to shared directories
2020-12-14 20:07 ` Keith Packard
@ 2020-12-14 20:07 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, Laurent Vivier, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
This commit renames two files which provide ARM semihosting support so
that they can be shared by other architectures:
1. target/arm/arm-semi.c -> hw/semihosting/common-semi.c
2. linux-user/arm/semihost.c -> linux-user/semihost.c
The build system was modified use a new config variable,
CONFIG_ARM_COMPATIBLE_SEMIHOSTING, which has been added to the ARM
softmmu and linux-user default configs. The contents of the source
files has not been changed in this patch.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
----
v2
Place common-semi.c name in arm_ss, just as arm-semi.c was
v3
Create CONFIG_ARM_COMPATIBLE_SEMIHOSTING and assign in
arm config files
v4
Also update aarch64_be default config
---
default-configs/devices/arm-softmmu.mak | 1 +
default-configs/targets/aarch64-linux-user.mak | 1 +
default-configs/targets/aarch64_be-linux-user.mak | 1 +
default-configs/targets/arm-linux-user.mak | 1 +
hw/semihosting/Kconfig | 3 +++
target/arm/arm-semi.c => hw/semihosting/common-semi.c | 0
hw/semihosting/meson.build | 3 +++
linux-user/arm/meson.build | 3 ---
linux-user/meson.build | 1 +
linux-user/{arm => }/semihost.c | 0
target/arm/meson.build | 2 --
11 files changed, 11 insertions(+), 5 deletions(-)
rename target/arm/arm-semi.c => hw/semihosting/common-semi.c (100%)
rename linux-user/{arm => }/semihost.c (100%)
diff --git a/default-configs/devices/arm-softmmu.mak b/default-configs/devices/arm-softmmu.mak
index 08a32123b4..0500156a0c 100644
--- a/default-configs/devices/arm-softmmu.mak
+++ b/default-configs/devices/arm-softmmu.mak
@@ -42,4 +42,5 @@ CONFIG_FSL_IMX25=y
CONFIG_FSL_IMX7=y
CONFIG_FSL_IMX6UL=y
CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
CONFIG_ALLWINNER_H3=y
diff --git a/default-configs/targets/aarch64-linux-user.mak b/default-configs/targets/aarch64-linux-user.mak
index 163c9209f4..4713253709 100644
--- a/default-configs/targets/aarch64-linux-user.mak
+++ b/default-configs/targets/aarch64-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=aarch64
TARGET_BASE_ARCH=arm
TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml
TARGET_HAS_BFLT=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/default-configs/targets/aarch64_be-linux-user.mak b/default-configs/targets/aarch64_be-linux-user.mak
index 4c953cf8c5..fae831558d 100644
--- a/default-configs/targets/aarch64_be-linux-user.mak
+++ b/default-configs/targets/aarch64_be-linux-user.mak
@@ -3,3 +3,4 @@ TARGET_BASE_ARCH=arm
TARGET_WORDS_BIGENDIAN=y
TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml
TARGET_HAS_BFLT=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/default-configs/targets/arm-linux-user.mak b/default-configs/targets/arm-linux-user.mak
index c7cd872e86..e741ffd4d3 100644
--- a/default-configs/targets/arm-linux-user.mak
+++ b/default-configs/targets/arm-linux-user.mak
@@ -3,3 +3,4 @@ TARGET_SYSTBL_ABI=common,oabi
TARGET_SYSTBL=syscall.tbl
TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml
TARGET_HAS_BFLT=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/hw/semihosting/Kconfig b/hw/semihosting/Kconfig
index efe0a30734..4c30dc6b16 100644
--- a/hw/semihosting/Kconfig
+++ b/hw/semihosting/Kconfig
@@ -1,3 +1,6 @@
config SEMIHOSTING
bool
+
+config ARM_COMPATIBLE_SEMIHOSTING
+ bool
diff --git a/target/arm/arm-semi.c b/hw/semihosting/common-semi.c
similarity index 100%
rename from target/arm/arm-semi.c
rename to hw/semihosting/common-semi.c
diff --git a/hw/semihosting/meson.build b/hw/semihosting/meson.build
index f40ac574c4..5b4a170270 100644
--- a/hw/semihosting/meson.build
+++ b/hw/semihosting/meson.build
@@ -2,3 +2,6 @@ specific_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files(
'config.c',
'console.c',
))
+
+specific_ss.add(when: ['CONFIG_ARM_COMPATIBLE_SEMIHOSTING'],
+ if_true: files('common-semi.c'))
diff --git a/linux-user/arm/meson.build b/linux-user/arm/meson.build
index 432984b58e..5a93c925cf 100644
--- a/linux-user/arm/meson.build
+++ b/linux-user/arm/meson.build
@@ -1,6 +1,3 @@
-linux_user_ss.add(when: 'TARGET_AARCH64', if_true: files('semihost.c'))
-linux_user_ss.add(when: 'TARGET_ARM', if_true: files('semihost.c'))
-
subdir('nwfpe')
syscall_nr_generators += {
diff --git a/linux-user/meson.build b/linux-user/meson.build
index 2b94e4ba24..7fe28d659e 100644
--- a/linux-user/meson.build
+++ b/linux-user/meson.build
@@ -16,6 +16,7 @@ linux_user_ss.add(rt)
linux_user_ss.add(when: 'TARGET_HAS_BFLT', if_true: files('flatload.c'))
linux_user_ss.add(when: 'TARGET_I386', if_true: files('vm86.c'))
+linux_user_ss.add(when: 'CONFIG_ARM_COMPATIBLE_SEMIHOSTING', if_true: files('semihost.c'))
syscall_nr_generators = {}
diff --git a/linux-user/arm/semihost.c b/linux-user/semihost.c
similarity index 100%
rename from linux-user/arm/semihost.c
rename to linux-user/semihost.c
diff --git a/target/arm/meson.build b/target/arm/meson.build
index f5de2a77b8..15b936c101 100644
--- a/target/arm/meson.build
+++ b/target/arm/meson.build
@@ -32,8 +32,6 @@ arm_ss.add(files(
))
arm_ss.add(zlib)
-arm_ss.add(when: 'CONFIG_TCG', if_true: files('arm-semi.c'))
-
arm_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c', 'kvm64.c'), if_false: files('kvm-stub.c'))
arm_ss.add(when: 'TARGET_AARCH64', if_true: files(
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 1/9] semihosting: Move ARM semihosting code to shared directories
@ 2020-12-14 20:07 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard, Alistair Francis
This commit renames two files which provide ARM semihosting support so
that they can be shared by other architectures:
1. target/arm/arm-semi.c -> hw/semihosting/common-semi.c
2. linux-user/arm/semihost.c -> linux-user/semihost.c
The build system was modified use a new config variable,
CONFIG_ARM_COMPATIBLE_SEMIHOSTING, which has been added to the ARM
softmmu and linux-user default configs. The contents of the source
files has not been changed in this patch.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
----
v2
Place common-semi.c name in arm_ss, just as arm-semi.c was
v3
Create CONFIG_ARM_COMPATIBLE_SEMIHOSTING and assign in
arm config files
v4
Also update aarch64_be default config
---
default-configs/devices/arm-softmmu.mak | 1 +
default-configs/targets/aarch64-linux-user.mak | 1 +
default-configs/targets/aarch64_be-linux-user.mak | 1 +
default-configs/targets/arm-linux-user.mak | 1 +
hw/semihosting/Kconfig | 3 +++
target/arm/arm-semi.c => hw/semihosting/common-semi.c | 0
hw/semihosting/meson.build | 3 +++
linux-user/arm/meson.build | 3 ---
linux-user/meson.build | 1 +
linux-user/{arm => }/semihost.c | 0
target/arm/meson.build | 2 --
11 files changed, 11 insertions(+), 5 deletions(-)
rename target/arm/arm-semi.c => hw/semihosting/common-semi.c (100%)
rename linux-user/{arm => }/semihost.c (100%)
diff --git a/default-configs/devices/arm-softmmu.mak b/default-configs/devices/arm-softmmu.mak
index 08a32123b4..0500156a0c 100644
--- a/default-configs/devices/arm-softmmu.mak
+++ b/default-configs/devices/arm-softmmu.mak
@@ -42,4 +42,5 @@ CONFIG_FSL_IMX25=y
CONFIG_FSL_IMX7=y
CONFIG_FSL_IMX6UL=y
CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
CONFIG_ALLWINNER_H3=y
diff --git a/default-configs/targets/aarch64-linux-user.mak b/default-configs/targets/aarch64-linux-user.mak
index 163c9209f4..4713253709 100644
--- a/default-configs/targets/aarch64-linux-user.mak
+++ b/default-configs/targets/aarch64-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=aarch64
TARGET_BASE_ARCH=arm
TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml
TARGET_HAS_BFLT=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/default-configs/targets/aarch64_be-linux-user.mak b/default-configs/targets/aarch64_be-linux-user.mak
index 4c953cf8c5..fae831558d 100644
--- a/default-configs/targets/aarch64_be-linux-user.mak
+++ b/default-configs/targets/aarch64_be-linux-user.mak
@@ -3,3 +3,4 @@ TARGET_BASE_ARCH=arm
TARGET_WORDS_BIGENDIAN=y
TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml
TARGET_HAS_BFLT=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/default-configs/targets/arm-linux-user.mak b/default-configs/targets/arm-linux-user.mak
index c7cd872e86..e741ffd4d3 100644
--- a/default-configs/targets/arm-linux-user.mak
+++ b/default-configs/targets/arm-linux-user.mak
@@ -3,3 +3,4 @@ TARGET_SYSTBL_ABI=common,oabi
TARGET_SYSTBL=syscall.tbl
TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml
TARGET_HAS_BFLT=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/hw/semihosting/Kconfig b/hw/semihosting/Kconfig
index efe0a30734..4c30dc6b16 100644
--- a/hw/semihosting/Kconfig
+++ b/hw/semihosting/Kconfig
@@ -1,3 +1,6 @@
config SEMIHOSTING
bool
+
+config ARM_COMPATIBLE_SEMIHOSTING
+ bool
diff --git a/target/arm/arm-semi.c b/hw/semihosting/common-semi.c
similarity index 100%
rename from target/arm/arm-semi.c
rename to hw/semihosting/common-semi.c
diff --git a/hw/semihosting/meson.build b/hw/semihosting/meson.build
index f40ac574c4..5b4a170270 100644
--- a/hw/semihosting/meson.build
+++ b/hw/semihosting/meson.build
@@ -2,3 +2,6 @@ specific_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files(
'config.c',
'console.c',
))
+
+specific_ss.add(when: ['CONFIG_ARM_COMPATIBLE_SEMIHOSTING'],
+ if_true: files('common-semi.c'))
diff --git a/linux-user/arm/meson.build b/linux-user/arm/meson.build
index 432984b58e..5a93c925cf 100644
--- a/linux-user/arm/meson.build
+++ b/linux-user/arm/meson.build
@@ -1,6 +1,3 @@
-linux_user_ss.add(when: 'TARGET_AARCH64', if_true: files('semihost.c'))
-linux_user_ss.add(when: 'TARGET_ARM', if_true: files('semihost.c'))
-
subdir('nwfpe')
syscall_nr_generators += {
diff --git a/linux-user/meson.build b/linux-user/meson.build
index 2b94e4ba24..7fe28d659e 100644
--- a/linux-user/meson.build
+++ b/linux-user/meson.build
@@ -16,6 +16,7 @@ linux_user_ss.add(rt)
linux_user_ss.add(when: 'TARGET_HAS_BFLT', if_true: files('flatload.c'))
linux_user_ss.add(when: 'TARGET_I386', if_true: files('vm86.c'))
+linux_user_ss.add(when: 'CONFIG_ARM_COMPATIBLE_SEMIHOSTING', if_true: files('semihost.c'))
syscall_nr_generators = {}
diff --git a/linux-user/arm/semihost.c b/linux-user/semihost.c
similarity index 100%
rename from linux-user/arm/semihost.c
rename to linux-user/semihost.c
diff --git a/target/arm/meson.build b/target/arm/meson.build
index f5de2a77b8..15b936c101 100644
--- a/target/arm/meson.build
+++ b/target/arm/meson.build
@@ -32,8 +32,6 @@ arm_ss.add(files(
))
arm_ss.add(zlib)
-arm_ss.add(when: 'CONFIG_TCG', if_true: files('arm-semi.c'))
-
arm_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c', 'kvm64.c'), if_false: files('kvm-stub.c'))
arm_ss.add(when: 'TARGET_AARCH64', if_true: files(
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 2/9] semihosting: Change common-semi API to be architecture-independent
2020-12-14 20:07 ` Keith Packard
@ 2020-12-14 20:07 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, Laurent Vivier, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
The public API is now defined in
hw/semihosting/common-semi.h. do_common_semihosting takes CPUState *
instead of CPUARMState *. All internal functions have been renamed
common_semi_ instead of arm_semi_ or arm_. Aside from the API change,
there are no functional changes in this patch.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
hw/semihosting/common-semi.c | 16 ++++++++++------
hw/semihosting/common-semi.h | 36 +++++++++++++++++++++++++++++++++++
linux-user/aarch64/cpu_loop.c | 3 ++-
linux-user/arm/cpu_loop.c | 3 ++-
target/arm/cpu.h | 8 --------
target/arm/helper.c | 5 +++--
target/arm/m_helper.c | 7 ++++++-
7 files changed, 59 insertions(+), 19 deletions(-)
create mode 100644 hw/semihosting/common-semi.h
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index f7b7bff522..74f09c038c 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -1,10 +1,14 @@
/*
- * Arm "Angel" semihosting syscalls
+ * Semihosting support for systems modeled on the Arm "Angel"
+ * semihosting syscalls design.
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
* Written by Paul Brook.
*
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ * Adapted for systems other than ARM, including RISC-V, by Keith Packard
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
@@ -373,12 +377,12 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* do anything with its return value, because it is not necessarily
* the result of the syscall, but could just be the old value of X0.
* The only thing safe to do with this is that the callers of
- * do_arm_semihosting() will write it straight back into X0.
+ * do_common_semihosting() will write it straight back into X0.
* (In linux-user mode, the callback will have happened before
* gdb_do_syscallv() returns.)
*
* We should tidy this up so neither this function nor
- * do_arm_semihosting() return a value, so the mistake of
+ * do_common_semihosting() return a value, so the mistake of
* doing something with the return value is not possible to make.
*/
@@ -675,10 +679,10 @@ static const GuestFDFunctions guestfd_fns[] = {
* leave the register unchanged. We use 0xdeadbeef as the return value
* when there isn't a defined return value for the call.
*/
-target_ulong do_arm_semihosting(CPUARMState *env)
+target_ulong do_common_semihosting(CPUState *cs)
{
- ARMCPU *cpu = env_archcpu(env);
- CPUState *cs = env_cpu(env);
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
char * s;
diff --git a/hw/semihosting/common-semi.h b/hw/semihosting/common-semi.h
new file mode 100644
index 0000000000..bc53e92c79
--- /dev/null
+++ b/hw/semihosting/common-semi.h
@@ -0,0 +1,36 @@
+/*
+ * Semihosting support for systems modeled on the Arm "Angel"
+ * semihosting syscalls design.
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019 Linaro
+ * Written by Paul Brook.
+ *
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ * Adapted for systems other than ARM, including RISC-V, by Keith Packard
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * ARM Semihosting is documented in:
+ * Semihosting for AArch32 and AArch64 Release 2.0
+ * https://static.docs.arm.com/100863/0200/semihosting.pdf
+ *
+ */
+
+#ifndef COMMON_SEMI_H
+#define COMMON_SEMI_H
+
+target_ulong do_common_semihosting(CPUState *cs);
+
+#endif /* COMMON_SEMI_H */
diff --git a/linux-user/aarch64/cpu_loop.c b/linux-user/aarch64/cpu_loop.c
index bbe9fefca8..42b9c15f53 100644
--- a/linux-user/aarch64/cpu_loop.c
+++ b/linux-user/aarch64/cpu_loop.c
@@ -22,6 +22,7 @@
#include "qemu.h"
#include "cpu_loop-common.h"
#include "qemu/guest-random.h"
+#include "hw/semihosting/common-semi.h"
#define get_user_code_u32(x, gaddr, env) \
({ abi_long __r = get_user_u32((x), (gaddr)); \
@@ -129,7 +130,7 @@ void cpu_loop(CPUARMState *env)
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_SEMIHOST:
- env->xregs[0] = do_arm_semihosting(env);
+ env->xregs[0] = do_common_semihosting(cs);
env->pc += 4;
break;
case EXCP_YIELD:
diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c
index 3d272b56ef..cadfb7fa43 100644
--- a/linux-user/arm/cpu_loop.c
+++ b/linux-user/arm/cpu_loop.c
@@ -22,6 +22,7 @@
#include "qemu.h"
#include "elf.h"
#include "cpu_loop-common.h"
+#include "hw/semihosting/common-semi.h"
#define get_user_code_u32(x, gaddr, env) \
({ abi_long __r = get_user_u32((x), (gaddr)); \
@@ -421,7 +422,7 @@ void cpu_loop(CPUARMState *env)
}
break;
case EXCP_SEMIHOST:
- env->regs[0] = do_arm_semihosting(env);
+ env->regs[0] = do_common_semihosting(cs);
env->regs[15] += env->thumb ? 2 : 4;
break;
case EXCP_INTERRUPT:
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 7e6c881a7e..49d9a314db 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -1068,14 +1068,6 @@ static inline void aarch64_sve_change_el(CPUARMState *env, int o,
static inline void aarch64_add_sve_properties(Object *obj) { }
#endif
-#if !defined(CONFIG_TCG)
-static inline target_ulong do_arm_semihosting(CPUARMState *env)
-{
- g_assert_not_reached();
-}
-#else
-target_ulong do_arm_semihosting(CPUARMState *env);
-#endif
void aarch64_sync_32_to_64(CPUARMState *env);
void aarch64_sync_64_to_32(CPUARMState *env);
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 7b8bcd6903..9e0bbc1e90 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -34,6 +34,7 @@
#ifdef CONFIG_TCG
#include "arm_ldst.h"
#include "exec/cpu_ldst.h"
+#include "hw/semihosting/common-semi.h"
#endif
#define ARM_CPU_FREQ 1000000000 /* FIXME: 1 GHz, should be configurable */
@@ -9879,13 +9880,13 @@ static void handle_semihosting(CPUState *cs)
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%" PRIx64 "\n",
env->xregs[0]);
- env->xregs[0] = do_arm_semihosting(env);
+ env->xregs[0] = do_common_semihosting(cs);
env->pc += 4;
} else {
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%x\n",
env->regs[0]);
- env->regs[0] = do_arm_semihosting(env);
+ env->regs[0] = do_common_semihosting(cs);
env->regs[15] += env->thumb ? 2 : 4;
}
}
diff --git a/target/arm/m_helper.c b/target/arm/m_helper.c
index 643dcafb83..6176003029 100644
--- a/target/arm/m_helper.c
+++ b/target/arm/m_helper.c
@@ -31,6 +31,7 @@
#ifdef CONFIG_TCG
#include "arm_ldst.h"
#include "exec/cpu_ldst.h"
+#include "hw/semihosting/common-semi.h"
#endif
static void v7m_msr_xpsr(CPUARMState *env, uint32_t mask,
@@ -2306,7 +2307,11 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%x\n",
env->regs[0]);
- env->regs[0] = do_arm_semihosting(env);
+#ifdef CONFIG_TCG
+ env->regs[0] = do_common_semihosting(cs);
+#else
+ g_assert_not_reached();
+#endif
env->regs[15] += env->thumb ? 2 : 4;
return;
case EXCP_BKPT:
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 2/9] semihosting: Change common-semi API to be architecture-independent
@ 2020-12-14 20:07 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard, Alistair Francis
The public API is now defined in
hw/semihosting/common-semi.h. do_common_semihosting takes CPUState *
instead of CPUARMState *. All internal functions have been renamed
common_semi_ instead of arm_semi_ or arm_. Aside from the API change,
there are no functional changes in this patch.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
hw/semihosting/common-semi.c | 16 ++++++++++------
hw/semihosting/common-semi.h | 36 +++++++++++++++++++++++++++++++++++
linux-user/aarch64/cpu_loop.c | 3 ++-
linux-user/arm/cpu_loop.c | 3 ++-
target/arm/cpu.h | 8 --------
target/arm/helper.c | 5 +++--
target/arm/m_helper.c | 7 ++++++-
7 files changed, 59 insertions(+), 19 deletions(-)
create mode 100644 hw/semihosting/common-semi.h
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index f7b7bff522..74f09c038c 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -1,10 +1,14 @@
/*
- * Arm "Angel" semihosting syscalls
+ * Semihosting support for systems modeled on the Arm "Angel"
+ * semihosting syscalls design.
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
* Written by Paul Brook.
*
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ * Adapted for systems other than ARM, including RISC-V, by Keith Packard
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
@@ -373,12 +377,12 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* do anything with its return value, because it is not necessarily
* the result of the syscall, but could just be the old value of X0.
* The only thing safe to do with this is that the callers of
- * do_arm_semihosting() will write it straight back into X0.
+ * do_common_semihosting() will write it straight back into X0.
* (In linux-user mode, the callback will have happened before
* gdb_do_syscallv() returns.)
*
* We should tidy this up so neither this function nor
- * do_arm_semihosting() return a value, so the mistake of
+ * do_common_semihosting() return a value, so the mistake of
* doing something with the return value is not possible to make.
*/
@@ -675,10 +679,10 @@ static const GuestFDFunctions guestfd_fns[] = {
* leave the register unchanged. We use 0xdeadbeef as the return value
* when there isn't a defined return value for the call.
*/
-target_ulong do_arm_semihosting(CPUARMState *env)
+target_ulong do_common_semihosting(CPUState *cs)
{
- ARMCPU *cpu = env_archcpu(env);
- CPUState *cs = env_cpu(env);
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
char * s;
diff --git a/hw/semihosting/common-semi.h b/hw/semihosting/common-semi.h
new file mode 100644
index 0000000000..bc53e92c79
--- /dev/null
+++ b/hw/semihosting/common-semi.h
@@ -0,0 +1,36 @@
+/*
+ * Semihosting support for systems modeled on the Arm "Angel"
+ * semihosting syscalls design.
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019 Linaro
+ * Written by Paul Brook.
+ *
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ * Adapted for systems other than ARM, including RISC-V, by Keith Packard
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * ARM Semihosting is documented in:
+ * Semihosting for AArch32 and AArch64 Release 2.0
+ * https://static.docs.arm.com/100863/0200/semihosting.pdf
+ *
+ */
+
+#ifndef COMMON_SEMI_H
+#define COMMON_SEMI_H
+
+target_ulong do_common_semihosting(CPUState *cs);
+
+#endif /* COMMON_SEMI_H */
diff --git a/linux-user/aarch64/cpu_loop.c b/linux-user/aarch64/cpu_loop.c
index bbe9fefca8..42b9c15f53 100644
--- a/linux-user/aarch64/cpu_loop.c
+++ b/linux-user/aarch64/cpu_loop.c
@@ -22,6 +22,7 @@
#include "qemu.h"
#include "cpu_loop-common.h"
#include "qemu/guest-random.h"
+#include "hw/semihosting/common-semi.h"
#define get_user_code_u32(x, gaddr, env) \
({ abi_long __r = get_user_u32((x), (gaddr)); \
@@ -129,7 +130,7 @@ void cpu_loop(CPUARMState *env)
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_SEMIHOST:
- env->xregs[0] = do_arm_semihosting(env);
+ env->xregs[0] = do_common_semihosting(cs);
env->pc += 4;
break;
case EXCP_YIELD:
diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c
index 3d272b56ef..cadfb7fa43 100644
--- a/linux-user/arm/cpu_loop.c
+++ b/linux-user/arm/cpu_loop.c
@@ -22,6 +22,7 @@
#include "qemu.h"
#include "elf.h"
#include "cpu_loop-common.h"
+#include "hw/semihosting/common-semi.h"
#define get_user_code_u32(x, gaddr, env) \
({ abi_long __r = get_user_u32((x), (gaddr)); \
@@ -421,7 +422,7 @@ void cpu_loop(CPUARMState *env)
}
break;
case EXCP_SEMIHOST:
- env->regs[0] = do_arm_semihosting(env);
+ env->regs[0] = do_common_semihosting(cs);
env->regs[15] += env->thumb ? 2 : 4;
break;
case EXCP_INTERRUPT:
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 7e6c881a7e..49d9a314db 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -1068,14 +1068,6 @@ static inline void aarch64_sve_change_el(CPUARMState *env, int o,
static inline void aarch64_add_sve_properties(Object *obj) { }
#endif
-#if !defined(CONFIG_TCG)
-static inline target_ulong do_arm_semihosting(CPUARMState *env)
-{
- g_assert_not_reached();
-}
-#else
-target_ulong do_arm_semihosting(CPUARMState *env);
-#endif
void aarch64_sync_32_to_64(CPUARMState *env);
void aarch64_sync_64_to_32(CPUARMState *env);
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 7b8bcd6903..9e0bbc1e90 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -34,6 +34,7 @@
#ifdef CONFIG_TCG
#include "arm_ldst.h"
#include "exec/cpu_ldst.h"
+#include "hw/semihosting/common-semi.h"
#endif
#define ARM_CPU_FREQ 1000000000 /* FIXME: 1 GHz, should be configurable */
@@ -9879,13 +9880,13 @@ static void handle_semihosting(CPUState *cs)
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%" PRIx64 "\n",
env->xregs[0]);
- env->xregs[0] = do_arm_semihosting(env);
+ env->xregs[0] = do_common_semihosting(cs);
env->pc += 4;
} else {
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%x\n",
env->regs[0]);
- env->regs[0] = do_arm_semihosting(env);
+ env->regs[0] = do_common_semihosting(cs);
env->regs[15] += env->thumb ? 2 : 4;
}
}
diff --git a/target/arm/m_helper.c b/target/arm/m_helper.c
index 643dcafb83..6176003029 100644
--- a/target/arm/m_helper.c
+++ b/target/arm/m_helper.c
@@ -31,6 +31,7 @@
#ifdef CONFIG_TCG
#include "arm_ldst.h"
#include "exec/cpu_ldst.h"
+#include "hw/semihosting/common-semi.h"
#endif
static void v7m_msr_xpsr(CPUARMState *env, uint32_t mask,
@@ -2306,7 +2307,11 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%x\n",
env->regs[0]);
- env->regs[0] = do_arm_semihosting(env);
+#ifdef CONFIG_TCG
+ env->regs[0] = do_common_semihosting(cs);
+#else
+ g_assert_not_reached();
+#endif
env->regs[15] += env->thumb ? 2 : 4;
return;
case EXCP_BKPT:
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 3/9] semihosting: Change internal common-semi interfaces to use CPUState *
2020-12-14 20:07 ` Keith Packard
@ 2020-12-14 20:07 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, Laurent Vivier, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
This makes all of the internal interfaces architecture-independent and
renames the internal functions to use the 'common_semi' prefix instead
of 'arm' or 'arm_semi'.
To do this, some new architecture-specific internal helper functions
were created:
static inline target_ulong
common_semi_arg(CPUState *cs, int argno)
Returns the argno'th semihosting argument, where argno can be
either 0 or 1.
static inline void
common_semi_set_ret(CPUState *cs, target_ulong ret)
Sets the semihosting return value.
static inline bool
common_semi_sys_exit_extended(CPUState *cs, int nr)
This detects whether the specified semihosting call, which
is either TARGET_SYS_EXIT or TARGET_SYS_EXIT_EXTENDED should
be executed using the TARGET_SYS_EXIT_EXTENDED semantics.
static inline target_ulong
common_semi_rambase(CPUState *cs)
Returns the base of RAM region used for heap and stack. This
is used to construct plausible values for the SYS_HEAPINFO
call.
In addition, several existing functions have been changed to flag
areas of code which are architecture specific:
static target_ulong
common_semi_flen_buf(CPUState *cs)
Returns the current stack pointer minus 64, which is
where a stat structure will be placed on the stack
#define GET_ARG(n)
This fetches arguments from the semihosting command's argument
block. The address of this is available implicitly through the
local 'args' variable. This is *mostly* architecture
independent, but does depend on the current ABI's notion of
the size of a 'long' parameter, which may need run-time checks
(as it does on AARCH64)
#define SET_ARG(n, val)
This mirrors GET_ARG and stores data back into the argument
block.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
----
v2:
Add common_semi_rambase hook to get memory address for
SYS_HEAPINFO call.
---
hw/semihosting/common-semi.c | 351 +++++++++++++++++++----------------
1 file changed, 187 insertions(+), 164 deletions(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index 74f09c038c..33c82f73b1 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -32,15 +32,18 @@
#include "cpu.h"
#include "hw/semihosting/semihost.h"
#include "hw/semihosting/console.h"
+#include "hw/semihosting/common-semi.h"
#include "qemu/log.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
-#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
+#define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "exec/gdbstub.h"
#include "qemu/cutils.h"
+#ifdef TARGET_ARM
#include "hw/arm/boot.h"
+#endif
#include "hw/boards.h"
#endif
@@ -134,6 +137,50 @@ typedef struct GuestFD {
static GArray *guestfd_array;
+#ifdef TARGET_ARM
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ return env->xregs[argno];
+ } else {
+ return env->regs[argno];
+ }
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ env->xregs[0] = ret;
+ } else {
+ env->regs[0] = ret;
+ }
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
+}
+
+#ifndef CONFIG_USER_ONLY
+#include "hw/arm/boot.h"
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+ CPUArchState *env = cs->env_ptr;
+ const struct arm_boot_info *info = env->boot_info;
+ return info->loader_start;
+}
+#endif
+
+#endif /* TARGET_ARM */
+
/*
* Allocate a new guest file descriptor and return it; if we
* couldn't allocate a new fd then return -1.
@@ -239,11 +286,10 @@ static target_ulong syscall_err;
#include "exec/softmmu-semi.h"
#endif
-static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
+static inline uint32_t set_swi_errno(CPUState *cs, uint32_t code)
{
if (code == (uint32_t)-1) {
#ifdef CONFIG_USER_ONLY
- CPUState *cs = env_cpu(env);
TaskState *ts = cs->opaque;
ts->swi_errno = errno;
@@ -254,10 +300,9 @@ static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
return code;
}
-static inline uint32_t get_swi_errno(CPUARMState *env)
+static inline uint32_t get_swi_errno(CPUState *cs)
{
#ifdef CONFIG_USER_ONLY
- CPUState *cs = env_cpu(env);
TaskState *ts = cs->opaque;
return ts->swi_errno;
@@ -266,24 +311,22 @@ static inline uint32_t get_swi_errno(CPUARMState *env)
#endif
}
-static target_ulong arm_semi_syscall_len;
+static target_ulong common_semi_syscall_len;
-static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- target_ulong reg0 = is_a64(env) ? env->xregs[0] : env->regs[0];
+ target_ulong reg0 = common_semi_arg(cs, 0);
if (ret == (target_ulong)-1) {
errno = err;
- set_swi_errno(env, -1);
+ set_swi_errno(cs, -1);
reg0 = ret;
} else {
/* Fixup syscalls that use nonstardard return conventions. */
switch (reg0) {
case TARGET_SYS_WRITE:
case TARGET_SYS_READ:
- reg0 = arm_semi_syscall_len - ret;
+ reg0 = common_semi_syscall_len - ret;
break;
case TARGET_SYS_SEEK:
reg0 = 0;
@@ -293,77 +336,66 @@ static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
break;
}
}
- if (is_a64(env)) {
- env->xregs[0] = reg0;
- } else {
- env->regs[0] = reg0;
- }
+ common_semi_set_ret(cs, reg0);
}
-static target_ulong arm_flen_buf(ARMCPU *cpu)
+static target_ulong common_semi_flen_buf(CPUState *cs)
{
+ target_ulong sp;
+#ifdef TARGET_ARM
/* Return an address in target memory of 64 bytes where the remote
* gdb should write its stat struct. (The format of this structure
* is defined by GDB's remote protocol and is not target-specific.)
* We put this on the guest's stack just below SP.
*/
+ ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
- target_ulong sp;
if (is_a64(env)) {
sp = env->xregs[31];
} else {
sp = env->regs[13];
}
+#endif
return sp - 64;
}
-static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void
+common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
/* The size is always stored in big-endian order, extract
the value. We assume the size always fit in 32 bits. */
uint32_t size;
- cpu_memory_rw_debug(cs, arm_flen_buf(cpu) + 32, (uint8_t *)&size, 4, 0);
+ cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) + 32,
+ (uint8_t *)&size, 4, 0);
size = be32_to_cpu(size);
- if (is_a64(env)) {
- env->xregs[0] = size;
- } else {
- env->regs[0] = size;
- }
+ common_semi_set_ret(cs, size);
errno = err;
- set_swi_errno(env, -1);
+ set_swi_errno(cs, -1);
}
-static int arm_semi_open_guestfd;
+static int common_semi_open_guestfd;
-static void arm_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void
+common_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
if (ret == (target_ulong)-1) {
errno = err;
- set_swi_errno(env, -1);
- dealloc_guestfd(arm_semi_open_guestfd);
+ set_swi_errno(cs, -1);
+ dealloc_guestfd(common_semi_open_guestfd);
} else {
- associate_guestfd(arm_semi_open_guestfd, ret);
- ret = arm_semi_open_guestfd;
- }
-
- if (is_a64(env)) {
- env->xregs[0] = ret;
- } else {
- env->regs[0] = ret;
+ associate_guestfd(common_semi_open_guestfd, ret);
+ ret = common_semi_open_guestfd;
}
+ common_semi_set_ret(cs, ret);
}
-static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
- const char *fmt, ...)
+static target_ulong
+common_semi_gdb_syscall(CPUState *cs, gdb_syscall_complete_cb cb,
+ const char *fmt, ...)
{
va_list va;
- CPUARMState *env = &cpu->env;
va_start(va, fmt);
gdb_do_syscallv(cb, fmt, va);
@@ -386,7 +418,7 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* doing something with the return value is not possible to make.
*/
- return is_a64(env) ? env->xregs[0] : env->regs[0];
+ return common_semi_arg(cs, 0);
}
/*
@@ -395,20 +427,18 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* do the work and return the required return value for the guest,
* setting the guest errno if appropriate.
*/
-typedef uint32_t sys_closefn(ARMCPU *cpu, GuestFD *gf);
-typedef uint32_t sys_writefn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_closefn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len);
-typedef uint32_t sys_readfn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len);
-typedef uint32_t sys_isattyfn(ARMCPU *cpu, GuestFD *gf);
-typedef uint32_t sys_seekfn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_isattyfn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_seekfn(CPUState *cs, GuestFD *gf,
target_ulong offset);
-typedef uint32_t sys_flenfn(ARMCPU *cpu, GuestFD *gf);
+typedef uint32_t sys_flenfn(CPUState *cs, GuestFD *gf);
-static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_closefn(CPUState *cs, GuestFD *gf)
{
- CPUARMState *env = &cpu->env;
-
/*
* Only close the underlying host fd if it's one we opened on behalf
* of the guest in SYS_OPEN.
@@ -418,20 +448,21 @@ static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
gf->hostfd == STDERR_FILENO) {
return 0;
}
- return set_swi_errno(env, close(gf->hostfd));
+ return set_swi_errno(cs, close(gf->hostfd));
}
-static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t host_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t ret;
- CPUARMState *env = &cpu->env;
char *s = lock_user(VERIFY_READ, buf, len, 1);
+ (void) env; /* Used in arm softmmu lock_user implicitly */
if (!s) {
/* Return bytes not written on error */
return len;
}
- ret = set_swi_errno(env, write(gf->hostfd, s, len));
+ ret = set_swi_errno(cs, write(gf->hostfd, s, len));
unlock_user(s, buf, 0);
if (ret == (uint32_t)-1) {
ret = 0;
@@ -440,18 +471,19 @@ static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf,
return len - ret;
}
-static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t host_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t ret;
- CPUARMState *env = &cpu->env;
char *s = lock_user(VERIFY_WRITE, buf, len, 0);
+ (void) env; /* Used in arm softmmu lock_user implicitly */
if (!s) {
/* return bytes not read */
return len;
}
do {
- ret = set_swi_errno(env, read(gf->hostfd, s, len));
+ ret = set_swi_errno(cs, read(gf->hostfd, s, len));
} while (ret == -1 && errno == EINTR);
unlock_user(s, buf, len);
if (ret == (uint32_t)-1) {
@@ -461,68 +493,66 @@ static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf,
return len - ret;
}
-static uint32_t host_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_isattyfn(CPUState *cs, GuestFD *gf)
{
return isatty(gf->hostfd);
}
-static uint32_t host_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
+static uint32_t host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
- CPUARMState *env = &cpu->env;
- uint32_t ret = set_swi_errno(env, lseek(gf->hostfd, offset, SEEK_SET));
+ uint32_t ret = set_swi_errno(cs, lseek(gf->hostfd, offset, SEEK_SET));
if (ret == (uint32_t)-1) {
return -1;
}
return 0;
}
-static uint32_t host_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_flenfn(CPUState *cs, GuestFD *gf)
{
- CPUARMState *env = &cpu->env;
struct stat buf;
- uint32_t ret = set_swi_errno(env, fstat(gf->hostfd, &buf));
+ uint32_t ret = set_swi_errno(cs, fstat(gf->hostfd, &buf));
if (ret == (uint32_t)-1) {
return -1;
}
return buf.st_size;
}
-static uint32_t gdb_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_closefn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", gf->hostfd);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "close,%x", gf->hostfd);
}
-static uint32_t gdb_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t gdb_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
- arm_semi_syscall_len = len;
- return arm_gdb_syscall(cpu, arm_semi_cb, "write,%x,%x,%x",
- gf->hostfd, buf, len);
+ common_semi_syscall_len = len;
+ return common_semi_gdb_syscall(cs, common_semi_cb, "write,%x,%x,%x",
+ gf->hostfd, buf, len);
}
-static uint32_t gdb_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t gdb_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
- arm_semi_syscall_len = len;
- return arm_gdb_syscall(cpu, arm_semi_cb, "read,%x,%x,%x",
- gf->hostfd, buf, len);
+ common_semi_syscall_len = len;
+ return common_semi_gdb_syscall(cs, common_semi_cb, "read,%x,%x,%x",
+ gf->hostfd, buf, len);
}
-static uint32_t gdb_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_isattyfn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "isatty,%x", gf->hostfd);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "isatty,%x", gf->hostfd);
}
-static uint32_t gdb_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
+static uint32_t gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0",
- gf->hostfd, offset);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "lseek,%x,%x,0",
+ gf->hostfd, offset);
}
-static uint32_t gdb_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_flenfn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x",
- gf->hostfd, arm_flen_buf(cpu));
+ return common_semi_gdb_syscall(cs, common_semi_flen_cb, "fstat,%x,%x",
+ gf->hostfd, common_semi_flen_buf(cs));
}
#define SHFB_MAGIC_0 0x53
@@ -551,31 +581,29 @@ static void init_featurefile_guestfd(int guestfd)
gf->featurefile_offset = 0;
}
-static uint32_t featurefile_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_closefn(CPUState *cs, GuestFD *gf)
{
/* Nothing to do */
return 0;
}
-static uint32_t featurefile_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
/* This fd can never be open for writing */
- CPUARMState *env = &cpu->env;
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
-static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t i;
-#ifndef CONFIG_USER_ONLY
- CPUARMState *env = &cpu->env;
-#endif
char *s;
+ (void) env; /* Used in arm softmmu lock_user implicitly */
s = lock_user(VERIFY_WRITE, buf, len, 0);
if (!s) {
return len;
@@ -595,19 +623,19 @@ static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf,
return len - i;
}
-static uint32_t featurefile_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_isattyfn(CPUState *cs, GuestFD *gf)
{
return 0;
}
-static uint32_t featurefile_seekfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_seekfn(CPUState *cs, GuestFD *gf,
target_ulong offset)
{
gf->featurefile_offset = offset;
return 0;
}
-static uint32_t featurefile_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_flenfn(CPUState *cs, GuestFD *gf)
{
return sizeof(featurefile_data);
}
@@ -651,16 +679,17 @@ static const GuestFDFunctions guestfd_fns[] = {
/* Read the input value from the argument block; fail the semihosting
* call if the memory read fails.
*/
+#ifdef TARGET_ARM
#define GET_ARG(n) do { \
if (is_a64(env)) { \
if (get_user_u64(arg ## n, args + (n) * 8)) { \
errno = EFAULT; \
- return set_swi_errno(env, -1); \
+ return set_swi_errno(cs, -1); \
} \
} else { \
if (get_user_u32(arg ## n, args + (n) * 4)) { \
errno = EFAULT; \
- return set_swi_errno(env, -1); \
+ return set_swi_errno(cs, -1); \
} \
} \
} while (0)
@@ -669,6 +698,7 @@ static const GuestFDFunctions guestfd_fns[] = {
(is_a64(env) ? \
put_user_u64(val, args + (n) * 8) : \
put_user_u32(val, args + (n) * 4))
+#endif
/*
* Do a semihosting call.
@@ -681,8 +711,7 @@ static const GuestFDFunctions guestfd_fns[] = {
*/
target_ulong do_common_semihosting(CPUState *cs)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
+ CPUArchState *env = cs->env_ptr;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
char * s;
@@ -691,14 +720,9 @@ target_ulong do_common_semihosting(CPUState *cs)
uint32_t len;
GuestFD *gf;
- if (is_a64(env)) {
- /* Note that the syscall number is in W0, not X0 */
- nr = env->xregs[0] & 0xffffffffU;
- args = env->xregs[1];
- } else {
- nr = env->regs[0];
- args = env->regs[1];
- }
+ (void) env; /* Used implicitly by arm lock_user macro */
+ nr = common_semi_arg(cs, 0) & 0xffffffffU;
+ args = common_semi_arg(cs, 1);
switch (nr) {
case TARGET_SYS_OPEN:
@@ -711,19 +735,19 @@ target_ulong do_common_semihosting(CPUState *cs)
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
if (arg1 >= 12) {
unlock_user(s, arg0, 0);
errno = EINVAL;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
guestfd = alloc_guestfd();
if (guestfd < 0) {
unlock_user(s, arg0, 0);
errno = EMFILE;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
if (strcmp(s, ":tt") == 0) {
@@ -752,18 +776,19 @@ target_ulong do_common_semihosting(CPUState *cs)
if (arg1 != 0 && arg1 != 1) {
dealloc_guestfd(guestfd);
errno = EACCES;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
init_featurefile_guestfd(guestfd);
return guestfd;
}
if (use_gdb_syscalls()) {
- arm_semi_open_guestfd = guestfd;
- ret = arm_gdb_syscall(cpu, arm_semi_open_cb, "open,%s,%x,1a4", arg0,
- (int)arg2 + 1, gdb_open_modeflags[arg1]);
+ common_semi_open_guestfd = guestfd;
+ ret = common_semi_gdb_syscall(cs, common_semi_open_cb,
+ "open,%s,%x,1a4", arg0, (int)arg2 + 1,
+ gdb_open_modeflags[arg1]);
} else {
- ret = set_swi_errno(env, open(s, open_modeflags[arg1], 0644));
+ ret = set_swi_errno(cs, open(s, open_modeflags[arg1], 0644));
if (ret == (uint32_t)-1) {
dealloc_guestfd(guestfd);
} else {
@@ -780,17 +805,17 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = guestfd_fns[gf->type].closefn(cpu, gf);
+ ret = guestfd_fns[gf->type].closefn(cs, gf);
dealloc_guestfd(arg0);
return ret;
case TARGET_SYS_WRITEC:
- qemu_semihosting_console_outc(env, args);
+ qemu_semihosting_console_outc(cs->env_ptr, args);
return 0xdeadbeef;
case TARGET_SYS_WRITE0:
- return qemu_semihosting_console_outs(env, args);
+ return qemu_semihosting_console_outs(cs->env_ptr, args);
case TARGET_SYS_WRITE:
GET_ARG(0);
GET_ARG(1);
@@ -800,10 +825,10 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].writefn(cpu, gf, arg1, len);
+ return guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
case TARGET_SYS_READ:
GET_ARG(0);
GET_ARG(1);
@@ -813,22 +838,22 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].readfn(cpu, gf, arg1, len);
+ return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
case TARGET_SYS_READC:
- return qemu_semihosting_console_inc(env);
+ return qemu_semihosting_console_inc(cs->env_ptr);
case TARGET_SYS_ISTTY:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].isattyfn(cpu, gf);
+ return guestfd_fns[gf->type].isattyfn(cs, gf);
case TARGET_SYS_SEEK:
GET_ARG(0);
GET_ARG(1);
@@ -836,20 +861,20 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].seekfn(cpu, gf, arg1);
+ return guestfd_fns[gf->type].seekfn(cs, gf, arg1);
case TARGET_SYS_FLEN:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].flenfn(cpu, gf);
+ return guestfd_fns[gf->type].flenfn(cs, gf);
case TARGET_SYS_TMPNAM:
qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
return -1;
@@ -857,15 +882,15 @@ target_ulong do_common_semihosting(CPUState *cs)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- ret = arm_gdb_syscall(cpu, arm_semi_cb, "unlink,%s",
- arg0, (int)arg1 + 1);
+ ret = common_semi_gdb_syscall(cs, common_semi_cb, "unlink,%s",
+ arg0, (int)arg1 + 1);
} else {
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = set_swi_errno(env, remove(s));
+ ret = set_swi_errno(cs, remove(s));
unlock_user(s, arg0, 0);
}
return ret;
@@ -875,17 +900,18 @@ target_ulong do_common_semihosting(CPUState *cs)
GET_ARG(2);
GET_ARG(3);
if (use_gdb_syscalls()) {
- return arm_gdb_syscall(cpu, arm_semi_cb, "rename,%s,%s",
- arg0, (int)arg1 + 1, arg2, (int)arg3 + 1);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "rename,%s,%s",
+ arg0, (int)arg1 + 1, arg2,
+ (int)arg3 + 1);
} else {
char *s2;
s = lock_user_string(arg0);
s2 = lock_user_string(arg2);
if (!s || !s2) {
errno = EFAULT;
- ret = set_swi_errno(env, -1);
+ ret = set_swi_errno(cs, -1);
} else {
- ret = set_swi_errno(env, rename(s, s2));
+ ret = set_swi_errno(cs, rename(s, s2));
}
if (s2)
unlock_user(s2, arg2, 0);
@@ -896,25 +922,25 @@ target_ulong do_common_semihosting(CPUState *cs)
case TARGET_SYS_CLOCK:
return clock() / (CLOCKS_PER_SEC / 100);
case TARGET_SYS_TIME:
- return set_swi_errno(env, time(NULL));
+ return set_swi_errno(cs, time(NULL));
case TARGET_SYS_SYSTEM:
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- return arm_gdb_syscall(cpu, arm_semi_cb, "system,%s",
- arg0, (int)arg1 + 1);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "system,%s",
+ arg0, (int)arg1 + 1);
} else {
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = set_swi_errno(env, system(s));
+ ret = set_swi_errno(cs, system(s));
unlock_user(s, arg0, 0);
return ret;
}
case TARGET_SYS_ERRNO:
- return get_swi_errno(env);
+ return get_swi_errno(cs);
case TARGET_SYS_GET_CMDLINE:
{
/* Build a command-line from the original argv.
@@ -966,21 +992,21 @@ target_ulong do_common_semihosting(CPUState *cs)
if (output_size > input_size) {
/* Not enough space to store command-line arguments. */
errno = E2BIG;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Adjust the command-line length. */
if (SET_ARG(1, output_size - 1)) {
/* Couldn't write back to argument block */
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Lock the buffer on the ARM side. */
output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
if (!output_buffer) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Copy the command-line arguments. */
@@ -996,7 +1022,7 @@ target_ulong do_common_semihosting(CPUState *cs)
if (copy_from_user(output_buffer, ts->info->arg_start,
output_size)) {
errno = EFAULT;
- status = set_swi_errno(env, -1);
+ status = set_swi_errno(cs, -1);
goto out;
}
@@ -1021,8 +1047,7 @@ target_ulong do_common_semihosting(CPUState *cs)
#ifdef CONFIG_USER_ONLY
TaskState *ts = cs->opaque;
#else
- const struct arm_boot_info *info = env->boot_info;
- target_ulong rambase = info->loader_start;
+ target_ulong rambase = common_semi_rambase(cs);
#endif
GET_ARG(0);
@@ -1036,7 +1061,7 @@ target_ulong do_common_semihosting(CPUState *cs)
abi_ulong ret;
ts->heap_base = do_brk(0);
- limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
+ limit = ts->heap_base + COMMON_SEMI_HEAP_SIZE;
/* Try a big heap, and reduce the size if that fails. */
for (;;) {
ret = do_brk(limit);
@@ -1064,23 +1089,19 @@ target_ulong do_common_semihosting(CPUState *cs)
for (i = 0; i < ARRAY_SIZE(retvals); i++) {
bool fail;
- if (is_a64(env)) {
- fail = put_user_u64(retvals[i], arg0 + i * 8);
- } else {
- fail = put_user_u32(retvals[i], arg0 + i * 4);
- }
+ fail = SET_ARG(i, retvals[i]);
if (fail) {
/* Couldn't write back to argument block */
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
}
return 0;
}
case TARGET_SYS_EXIT:
case TARGET_SYS_EXIT_EXTENDED:
- if (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(env)) {
+ if (common_semi_sys_exit_extended(cs, nr)) {
/*
* The A64 version of SYS_EXIT takes a parameter block,
* so the application-exit type can return a subcode which
@@ -1105,7 +1126,7 @@ target_ulong do_common_semihosting(CPUState *cs)
*/
ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
}
- gdb_exit(env, ret);
+ gdb_exit(cs->env_ptr, ret);
exit(ret);
case TARGET_SYS_SYNCCACHE:
/*
@@ -1113,9 +1134,11 @@ target_ulong do_common_semihosting(CPUState *cs)
* virtual address range. This is a nop for us since we don't
* implement caches. This is only present on A64.
*/
- if (is_a64(env)) {
+#ifdef TARGET_ARM
+ if (is_a64(cs->env_ptr)) {
return 0;
}
+#endif
/* fall through -- invalid for A32/T32 */
default:
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 3/9] semihosting: Change internal common-semi interfaces to use CPUState *
@ 2020-12-14 20:07 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard, Alistair Francis
This makes all of the internal interfaces architecture-independent and
renames the internal functions to use the 'common_semi' prefix instead
of 'arm' or 'arm_semi'.
To do this, some new architecture-specific internal helper functions
were created:
static inline target_ulong
common_semi_arg(CPUState *cs, int argno)
Returns the argno'th semihosting argument, where argno can be
either 0 or 1.
static inline void
common_semi_set_ret(CPUState *cs, target_ulong ret)
Sets the semihosting return value.
static inline bool
common_semi_sys_exit_extended(CPUState *cs, int nr)
This detects whether the specified semihosting call, which
is either TARGET_SYS_EXIT or TARGET_SYS_EXIT_EXTENDED should
be executed using the TARGET_SYS_EXIT_EXTENDED semantics.
static inline target_ulong
common_semi_rambase(CPUState *cs)
Returns the base of RAM region used for heap and stack. This
is used to construct plausible values for the SYS_HEAPINFO
call.
In addition, several existing functions have been changed to flag
areas of code which are architecture specific:
static target_ulong
common_semi_flen_buf(CPUState *cs)
Returns the current stack pointer minus 64, which is
where a stat structure will be placed on the stack
#define GET_ARG(n)
This fetches arguments from the semihosting command's argument
block. The address of this is available implicitly through the
local 'args' variable. This is *mostly* architecture
independent, but does depend on the current ABI's notion of
the size of a 'long' parameter, which may need run-time checks
(as it does on AARCH64)
#define SET_ARG(n, val)
This mirrors GET_ARG and stores data back into the argument
block.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
----
v2:
Add common_semi_rambase hook to get memory address for
SYS_HEAPINFO call.
---
hw/semihosting/common-semi.c | 351 +++++++++++++++++++----------------
1 file changed, 187 insertions(+), 164 deletions(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index 74f09c038c..33c82f73b1 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -32,15 +32,18 @@
#include "cpu.h"
#include "hw/semihosting/semihost.h"
#include "hw/semihosting/console.h"
+#include "hw/semihosting/common-semi.h"
#include "qemu/log.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
-#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
+#define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "exec/gdbstub.h"
#include "qemu/cutils.h"
+#ifdef TARGET_ARM
#include "hw/arm/boot.h"
+#endif
#include "hw/boards.h"
#endif
@@ -134,6 +137,50 @@ typedef struct GuestFD {
static GArray *guestfd_array;
+#ifdef TARGET_ARM
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ return env->xregs[argno];
+ } else {
+ return env->regs[argno];
+ }
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ env->xregs[0] = ret;
+ } else {
+ env->regs[0] = ret;
+ }
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
+}
+
+#ifndef CONFIG_USER_ONLY
+#include "hw/arm/boot.h"
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+ CPUArchState *env = cs->env_ptr;
+ const struct arm_boot_info *info = env->boot_info;
+ return info->loader_start;
+}
+#endif
+
+#endif /* TARGET_ARM */
+
/*
* Allocate a new guest file descriptor and return it; if we
* couldn't allocate a new fd then return -1.
@@ -239,11 +286,10 @@ static target_ulong syscall_err;
#include "exec/softmmu-semi.h"
#endif
-static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
+static inline uint32_t set_swi_errno(CPUState *cs, uint32_t code)
{
if (code == (uint32_t)-1) {
#ifdef CONFIG_USER_ONLY
- CPUState *cs = env_cpu(env);
TaskState *ts = cs->opaque;
ts->swi_errno = errno;
@@ -254,10 +300,9 @@ static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
return code;
}
-static inline uint32_t get_swi_errno(CPUARMState *env)
+static inline uint32_t get_swi_errno(CPUState *cs)
{
#ifdef CONFIG_USER_ONLY
- CPUState *cs = env_cpu(env);
TaskState *ts = cs->opaque;
return ts->swi_errno;
@@ -266,24 +311,22 @@ static inline uint32_t get_swi_errno(CPUARMState *env)
#endif
}
-static target_ulong arm_semi_syscall_len;
+static target_ulong common_semi_syscall_len;
-static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- target_ulong reg0 = is_a64(env) ? env->xregs[0] : env->regs[0];
+ target_ulong reg0 = common_semi_arg(cs, 0);
if (ret == (target_ulong)-1) {
errno = err;
- set_swi_errno(env, -1);
+ set_swi_errno(cs, -1);
reg0 = ret;
} else {
/* Fixup syscalls that use nonstardard return conventions. */
switch (reg0) {
case TARGET_SYS_WRITE:
case TARGET_SYS_READ:
- reg0 = arm_semi_syscall_len - ret;
+ reg0 = common_semi_syscall_len - ret;
break;
case TARGET_SYS_SEEK:
reg0 = 0;
@@ -293,77 +336,66 @@ static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
break;
}
}
- if (is_a64(env)) {
- env->xregs[0] = reg0;
- } else {
- env->regs[0] = reg0;
- }
+ common_semi_set_ret(cs, reg0);
}
-static target_ulong arm_flen_buf(ARMCPU *cpu)
+static target_ulong common_semi_flen_buf(CPUState *cs)
{
+ target_ulong sp;
+#ifdef TARGET_ARM
/* Return an address in target memory of 64 bytes where the remote
* gdb should write its stat struct. (The format of this structure
* is defined by GDB's remote protocol and is not target-specific.)
* We put this on the guest's stack just below SP.
*/
+ ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
- target_ulong sp;
if (is_a64(env)) {
sp = env->xregs[31];
} else {
sp = env->regs[13];
}
+#endif
return sp - 64;
}
-static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void
+common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
/* The size is always stored in big-endian order, extract
the value. We assume the size always fit in 32 bits. */
uint32_t size;
- cpu_memory_rw_debug(cs, arm_flen_buf(cpu) + 32, (uint8_t *)&size, 4, 0);
+ cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) + 32,
+ (uint8_t *)&size, 4, 0);
size = be32_to_cpu(size);
- if (is_a64(env)) {
- env->xregs[0] = size;
- } else {
- env->regs[0] = size;
- }
+ common_semi_set_ret(cs, size);
errno = err;
- set_swi_errno(env, -1);
+ set_swi_errno(cs, -1);
}
-static int arm_semi_open_guestfd;
+static int common_semi_open_guestfd;
-static void arm_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void
+common_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
if (ret == (target_ulong)-1) {
errno = err;
- set_swi_errno(env, -1);
- dealloc_guestfd(arm_semi_open_guestfd);
+ set_swi_errno(cs, -1);
+ dealloc_guestfd(common_semi_open_guestfd);
} else {
- associate_guestfd(arm_semi_open_guestfd, ret);
- ret = arm_semi_open_guestfd;
- }
-
- if (is_a64(env)) {
- env->xregs[0] = ret;
- } else {
- env->regs[0] = ret;
+ associate_guestfd(common_semi_open_guestfd, ret);
+ ret = common_semi_open_guestfd;
}
+ common_semi_set_ret(cs, ret);
}
-static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
- const char *fmt, ...)
+static target_ulong
+common_semi_gdb_syscall(CPUState *cs, gdb_syscall_complete_cb cb,
+ const char *fmt, ...)
{
va_list va;
- CPUARMState *env = &cpu->env;
va_start(va, fmt);
gdb_do_syscallv(cb, fmt, va);
@@ -386,7 +418,7 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* doing something with the return value is not possible to make.
*/
- return is_a64(env) ? env->xregs[0] : env->regs[0];
+ return common_semi_arg(cs, 0);
}
/*
@@ -395,20 +427,18 @@ static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
* do the work and return the required return value for the guest,
* setting the guest errno if appropriate.
*/
-typedef uint32_t sys_closefn(ARMCPU *cpu, GuestFD *gf);
-typedef uint32_t sys_writefn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_closefn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len);
-typedef uint32_t sys_readfn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len);
-typedef uint32_t sys_isattyfn(ARMCPU *cpu, GuestFD *gf);
-typedef uint32_t sys_seekfn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_isattyfn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_seekfn(CPUState *cs, GuestFD *gf,
target_ulong offset);
-typedef uint32_t sys_flenfn(ARMCPU *cpu, GuestFD *gf);
+typedef uint32_t sys_flenfn(CPUState *cs, GuestFD *gf);
-static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_closefn(CPUState *cs, GuestFD *gf)
{
- CPUARMState *env = &cpu->env;
-
/*
* Only close the underlying host fd if it's one we opened on behalf
* of the guest in SYS_OPEN.
@@ -418,20 +448,21 @@ static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
gf->hostfd == STDERR_FILENO) {
return 0;
}
- return set_swi_errno(env, close(gf->hostfd));
+ return set_swi_errno(cs, close(gf->hostfd));
}
-static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t host_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t ret;
- CPUARMState *env = &cpu->env;
char *s = lock_user(VERIFY_READ, buf, len, 1);
+ (void) env; /* Used in arm softmmu lock_user implicitly */
if (!s) {
/* Return bytes not written on error */
return len;
}
- ret = set_swi_errno(env, write(gf->hostfd, s, len));
+ ret = set_swi_errno(cs, write(gf->hostfd, s, len));
unlock_user(s, buf, 0);
if (ret == (uint32_t)-1) {
ret = 0;
@@ -440,18 +471,19 @@ static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf,
return len - ret;
}
-static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t host_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t ret;
- CPUARMState *env = &cpu->env;
char *s = lock_user(VERIFY_WRITE, buf, len, 0);
+ (void) env; /* Used in arm softmmu lock_user implicitly */
if (!s) {
/* return bytes not read */
return len;
}
do {
- ret = set_swi_errno(env, read(gf->hostfd, s, len));
+ ret = set_swi_errno(cs, read(gf->hostfd, s, len));
} while (ret == -1 && errno == EINTR);
unlock_user(s, buf, len);
if (ret == (uint32_t)-1) {
@@ -461,68 +493,66 @@ static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf,
return len - ret;
}
-static uint32_t host_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_isattyfn(CPUState *cs, GuestFD *gf)
{
return isatty(gf->hostfd);
}
-static uint32_t host_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
+static uint32_t host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
- CPUARMState *env = &cpu->env;
- uint32_t ret = set_swi_errno(env, lseek(gf->hostfd, offset, SEEK_SET));
+ uint32_t ret = set_swi_errno(cs, lseek(gf->hostfd, offset, SEEK_SET));
if (ret == (uint32_t)-1) {
return -1;
}
return 0;
}
-static uint32_t host_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_flenfn(CPUState *cs, GuestFD *gf)
{
- CPUARMState *env = &cpu->env;
struct stat buf;
- uint32_t ret = set_swi_errno(env, fstat(gf->hostfd, &buf));
+ uint32_t ret = set_swi_errno(cs, fstat(gf->hostfd, &buf));
if (ret == (uint32_t)-1) {
return -1;
}
return buf.st_size;
}
-static uint32_t gdb_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_closefn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", gf->hostfd);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "close,%x", gf->hostfd);
}
-static uint32_t gdb_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t gdb_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
- arm_semi_syscall_len = len;
- return arm_gdb_syscall(cpu, arm_semi_cb, "write,%x,%x,%x",
- gf->hostfd, buf, len);
+ common_semi_syscall_len = len;
+ return common_semi_gdb_syscall(cs, common_semi_cb, "write,%x,%x,%x",
+ gf->hostfd, buf, len);
}
-static uint32_t gdb_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t gdb_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
- arm_semi_syscall_len = len;
- return arm_gdb_syscall(cpu, arm_semi_cb, "read,%x,%x,%x",
- gf->hostfd, buf, len);
+ common_semi_syscall_len = len;
+ return common_semi_gdb_syscall(cs, common_semi_cb, "read,%x,%x,%x",
+ gf->hostfd, buf, len);
}
-static uint32_t gdb_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_isattyfn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "isatty,%x", gf->hostfd);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "isatty,%x", gf->hostfd);
}
-static uint32_t gdb_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
+static uint32_t gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
- return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0",
- gf->hostfd, offset);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "lseek,%x,%x,0",
+ gf->hostfd, offset);
}
-static uint32_t gdb_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_flenfn(CPUState *cs, GuestFD *gf)
{
- return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x",
- gf->hostfd, arm_flen_buf(cpu));
+ return common_semi_gdb_syscall(cs, common_semi_flen_cb, "fstat,%x,%x",
+ gf->hostfd, common_semi_flen_buf(cs));
}
#define SHFB_MAGIC_0 0x53
@@ -551,31 +581,29 @@ static void init_featurefile_guestfd(int guestfd)
gf->featurefile_offset = 0;
}
-static uint32_t featurefile_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_closefn(CPUState *cs, GuestFD *gf)
{
/* Nothing to do */
return 0;
}
-static uint32_t featurefile_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
/* This fd can never be open for writing */
- CPUARMState *env = &cpu->env;
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
-static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
+ CPUArchState *env = cs->env_ptr;
uint32_t i;
-#ifndef CONFIG_USER_ONLY
- CPUARMState *env = &cpu->env;
-#endif
char *s;
+ (void) env; /* Used in arm softmmu lock_user implicitly */
s = lock_user(VERIFY_WRITE, buf, len, 0);
if (!s) {
return len;
@@ -595,19 +623,19 @@ static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf,
return len - i;
}
-static uint32_t featurefile_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_isattyfn(CPUState *cs, GuestFD *gf)
{
return 0;
}
-static uint32_t featurefile_seekfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_seekfn(CPUState *cs, GuestFD *gf,
target_ulong offset)
{
gf->featurefile_offset = offset;
return 0;
}
-static uint32_t featurefile_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_flenfn(CPUState *cs, GuestFD *gf)
{
return sizeof(featurefile_data);
}
@@ -651,16 +679,17 @@ static const GuestFDFunctions guestfd_fns[] = {
/* Read the input value from the argument block; fail the semihosting
* call if the memory read fails.
*/
+#ifdef TARGET_ARM
#define GET_ARG(n) do { \
if (is_a64(env)) { \
if (get_user_u64(arg ## n, args + (n) * 8)) { \
errno = EFAULT; \
- return set_swi_errno(env, -1); \
+ return set_swi_errno(cs, -1); \
} \
} else { \
if (get_user_u32(arg ## n, args + (n) * 4)) { \
errno = EFAULT; \
- return set_swi_errno(env, -1); \
+ return set_swi_errno(cs, -1); \
} \
} \
} while (0)
@@ -669,6 +698,7 @@ static const GuestFDFunctions guestfd_fns[] = {
(is_a64(env) ? \
put_user_u64(val, args + (n) * 8) : \
put_user_u32(val, args + (n) * 4))
+#endif
/*
* Do a semihosting call.
@@ -681,8 +711,7 @@ static const GuestFDFunctions guestfd_fns[] = {
*/
target_ulong do_common_semihosting(CPUState *cs)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
+ CPUArchState *env = cs->env_ptr;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
char * s;
@@ -691,14 +720,9 @@ target_ulong do_common_semihosting(CPUState *cs)
uint32_t len;
GuestFD *gf;
- if (is_a64(env)) {
- /* Note that the syscall number is in W0, not X0 */
- nr = env->xregs[0] & 0xffffffffU;
- args = env->xregs[1];
- } else {
- nr = env->regs[0];
- args = env->regs[1];
- }
+ (void) env; /* Used implicitly by arm lock_user macro */
+ nr = common_semi_arg(cs, 0) & 0xffffffffU;
+ args = common_semi_arg(cs, 1);
switch (nr) {
case TARGET_SYS_OPEN:
@@ -711,19 +735,19 @@ target_ulong do_common_semihosting(CPUState *cs)
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
if (arg1 >= 12) {
unlock_user(s, arg0, 0);
errno = EINVAL;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
guestfd = alloc_guestfd();
if (guestfd < 0) {
unlock_user(s, arg0, 0);
errno = EMFILE;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
if (strcmp(s, ":tt") == 0) {
@@ -752,18 +776,19 @@ target_ulong do_common_semihosting(CPUState *cs)
if (arg1 != 0 && arg1 != 1) {
dealloc_guestfd(guestfd);
errno = EACCES;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
init_featurefile_guestfd(guestfd);
return guestfd;
}
if (use_gdb_syscalls()) {
- arm_semi_open_guestfd = guestfd;
- ret = arm_gdb_syscall(cpu, arm_semi_open_cb, "open,%s,%x,1a4", arg0,
- (int)arg2 + 1, gdb_open_modeflags[arg1]);
+ common_semi_open_guestfd = guestfd;
+ ret = common_semi_gdb_syscall(cs, common_semi_open_cb,
+ "open,%s,%x,1a4", arg0, (int)arg2 + 1,
+ gdb_open_modeflags[arg1]);
} else {
- ret = set_swi_errno(env, open(s, open_modeflags[arg1], 0644));
+ ret = set_swi_errno(cs, open(s, open_modeflags[arg1], 0644));
if (ret == (uint32_t)-1) {
dealloc_guestfd(guestfd);
} else {
@@ -780,17 +805,17 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = guestfd_fns[gf->type].closefn(cpu, gf);
+ ret = guestfd_fns[gf->type].closefn(cs, gf);
dealloc_guestfd(arg0);
return ret;
case TARGET_SYS_WRITEC:
- qemu_semihosting_console_outc(env, args);
+ qemu_semihosting_console_outc(cs->env_ptr, args);
return 0xdeadbeef;
case TARGET_SYS_WRITE0:
- return qemu_semihosting_console_outs(env, args);
+ return qemu_semihosting_console_outs(cs->env_ptr, args);
case TARGET_SYS_WRITE:
GET_ARG(0);
GET_ARG(1);
@@ -800,10 +825,10 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].writefn(cpu, gf, arg1, len);
+ return guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
case TARGET_SYS_READ:
GET_ARG(0);
GET_ARG(1);
@@ -813,22 +838,22 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].readfn(cpu, gf, arg1, len);
+ return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
case TARGET_SYS_READC:
- return qemu_semihosting_console_inc(env);
+ return qemu_semihosting_console_inc(cs->env_ptr);
case TARGET_SYS_ISTTY:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].isattyfn(cpu, gf);
+ return guestfd_fns[gf->type].isattyfn(cs, gf);
case TARGET_SYS_SEEK:
GET_ARG(0);
GET_ARG(1);
@@ -836,20 +861,20 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].seekfn(cpu, gf, arg1);
+ return guestfd_fns[gf->type].seekfn(cs, gf, arg1);
case TARGET_SYS_FLEN:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
errno = EBADF;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- return guestfd_fns[gf->type].flenfn(cpu, gf);
+ return guestfd_fns[gf->type].flenfn(cs, gf);
case TARGET_SYS_TMPNAM:
qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
return -1;
@@ -857,15 +882,15 @@ target_ulong do_common_semihosting(CPUState *cs)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- ret = arm_gdb_syscall(cpu, arm_semi_cb, "unlink,%s",
- arg0, (int)arg1 + 1);
+ ret = common_semi_gdb_syscall(cs, common_semi_cb, "unlink,%s",
+ arg0, (int)arg1 + 1);
} else {
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = set_swi_errno(env, remove(s));
+ ret = set_swi_errno(cs, remove(s));
unlock_user(s, arg0, 0);
}
return ret;
@@ -875,17 +900,18 @@ target_ulong do_common_semihosting(CPUState *cs)
GET_ARG(2);
GET_ARG(3);
if (use_gdb_syscalls()) {
- return arm_gdb_syscall(cpu, arm_semi_cb, "rename,%s,%s",
- arg0, (int)arg1 + 1, arg2, (int)arg3 + 1);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "rename,%s,%s",
+ arg0, (int)arg1 + 1, arg2,
+ (int)arg3 + 1);
} else {
char *s2;
s = lock_user_string(arg0);
s2 = lock_user_string(arg2);
if (!s || !s2) {
errno = EFAULT;
- ret = set_swi_errno(env, -1);
+ ret = set_swi_errno(cs, -1);
} else {
- ret = set_swi_errno(env, rename(s, s2));
+ ret = set_swi_errno(cs, rename(s, s2));
}
if (s2)
unlock_user(s2, arg2, 0);
@@ -896,25 +922,25 @@ target_ulong do_common_semihosting(CPUState *cs)
case TARGET_SYS_CLOCK:
return clock() / (CLOCKS_PER_SEC / 100);
case TARGET_SYS_TIME:
- return set_swi_errno(env, time(NULL));
+ return set_swi_errno(cs, time(NULL));
case TARGET_SYS_SYSTEM:
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- return arm_gdb_syscall(cpu, arm_semi_cb, "system,%s",
- arg0, (int)arg1 + 1);
+ return common_semi_gdb_syscall(cs, common_semi_cb, "system,%s",
+ arg0, (int)arg1 + 1);
} else {
s = lock_user_string(arg0);
if (!s) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
- ret = set_swi_errno(env, system(s));
+ ret = set_swi_errno(cs, system(s));
unlock_user(s, arg0, 0);
return ret;
}
case TARGET_SYS_ERRNO:
- return get_swi_errno(env);
+ return get_swi_errno(cs);
case TARGET_SYS_GET_CMDLINE:
{
/* Build a command-line from the original argv.
@@ -966,21 +992,21 @@ target_ulong do_common_semihosting(CPUState *cs)
if (output_size > input_size) {
/* Not enough space to store command-line arguments. */
errno = E2BIG;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Adjust the command-line length. */
if (SET_ARG(1, output_size - 1)) {
/* Couldn't write back to argument block */
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Lock the buffer on the ARM side. */
output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
if (!output_buffer) {
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
/* Copy the command-line arguments. */
@@ -996,7 +1022,7 @@ target_ulong do_common_semihosting(CPUState *cs)
if (copy_from_user(output_buffer, ts->info->arg_start,
output_size)) {
errno = EFAULT;
- status = set_swi_errno(env, -1);
+ status = set_swi_errno(cs, -1);
goto out;
}
@@ -1021,8 +1047,7 @@ target_ulong do_common_semihosting(CPUState *cs)
#ifdef CONFIG_USER_ONLY
TaskState *ts = cs->opaque;
#else
- const struct arm_boot_info *info = env->boot_info;
- target_ulong rambase = info->loader_start;
+ target_ulong rambase = common_semi_rambase(cs);
#endif
GET_ARG(0);
@@ -1036,7 +1061,7 @@ target_ulong do_common_semihosting(CPUState *cs)
abi_ulong ret;
ts->heap_base = do_brk(0);
- limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
+ limit = ts->heap_base + COMMON_SEMI_HEAP_SIZE;
/* Try a big heap, and reduce the size if that fails. */
for (;;) {
ret = do_brk(limit);
@@ -1064,23 +1089,19 @@ target_ulong do_common_semihosting(CPUState *cs)
for (i = 0; i < ARRAY_SIZE(retvals); i++) {
bool fail;
- if (is_a64(env)) {
- fail = put_user_u64(retvals[i], arg0 + i * 8);
- } else {
- fail = put_user_u32(retvals[i], arg0 + i * 4);
- }
+ fail = SET_ARG(i, retvals[i]);
if (fail) {
/* Couldn't write back to argument block */
errno = EFAULT;
- return set_swi_errno(env, -1);
+ return set_swi_errno(cs, -1);
}
}
return 0;
}
case TARGET_SYS_EXIT:
case TARGET_SYS_EXIT_EXTENDED:
- if (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(env)) {
+ if (common_semi_sys_exit_extended(cs, nr)) {
/*
* The A64 version of SYS_EXIT takes a parameter block,
* so the application-exit type can return a subcode which
@@ -1105,7 +1126,7 @@ target_ulong do_common_semihosting(CPUState *cs)
*/
ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
}
- gdb_exit(env, ret);
+ gdb_exit(cs->env_ptr, ret);
exit(ret);
case TARGET_SYS_SYNCCACHE:
/*
@@ -1113,9 +1134,11 @@ target_ulong do_common_semihosting(CPUState *cs)
* virtual address range. This is a nop for us since we don't
* implement caches. This is only present on A64.
*/
- if (is_a64(env)) {
+#ifdef TARGET_ARM
+ if (is_a64(cs->env_ptr)) {
return 0;
}
+#endif
/* fall through -- invalid for A32/T32 */
default:
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 4/9] semihosting: Support SYS_HEAPINFO when env->boot_info is not set
2020-12-14 20:07 ` Keith Packard
@ 2020-12-14 20:07 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, Laurent Vivier, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
env->boot_info is only set in some ARM startup paths, so we cannot
rely on it to support the SYS_HEAPINFO semihosting function. When not
available, fallback to finding a RAM memory region containing the
current stack and use the base of that.
Signed-off-by: Keith Packard <keithp@keithp.com>
---
v2
Explicitly convert 64-bits to 128-bits in find_region_base
for hosts that don't have native 128-bit int type.
---
hw/semihosting/common-semi.c | 43 +++++++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index 33c82f73b1..f09deff4d3 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -137,6 +137,36 @@ typedef struct GuestFD {
static GArray *guestfd_array;
+#ifndef CONFIG_USER_ONLY
+#include "exec/address-spaces.h"
+/*
+ * Find the base of a RAM region containing the specified address
+ */
+static inline hwaddr
+common_semi_find_region_base(hwaddr addr)
+{
+ MemoryRegion *subregion;
+
+ /*
+ * Find the chunk of R/W memory containing the address. This is
+ * used for the SYS_HEAPINFO semihosting call, which should
+ * probably be using information from the loaded application.
+ */
+ QTAILQ_FOREACH(subregion, &get_system_memory()->subregions,
+ subregions_link) {
+ if (subregion->ram && !subregion->readonly) {
+ Int128 top128 = int128_add(int128_make64(subregion->addr),
+ subregion->size);
+ Int128 addr128 = int128_make64(addr);
+ if (subregion->addr <= addr && int128_lt(addr128, top128)) {
+ return subregion->addr;
+ }
+ }
+ }
+ return 0;
+}
+#endif
+
#ifdef TARGET_ARM
static inline target_ulong
common_semi_arg(CPUState *cs, int argno)
@@ -175,7 +205,18 @@ common_semi_rambase(CPUState *cs)
{
CPUArchState *env = cs->env_ptr;
const struct arm_boot_info *info = env->boot_info;
- return info->loader_start;
+ target_ulong sp;
+
+ if (info) {
+ return info->loader_start;
+ }
+
+ if (is_a64(env)) {
+ sp = env->xregs[31];
+ } else {
+ sp = env->regs[13];
+ }
+ return common_semi_find_region_base(sp);
}
#endif
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 4/9] semihosting: Support SYS_HEAPINFO when env->boot_info is not set
@ 2020-12-14 20:07 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
env->boot_info is only set in some ARM startup paths, so we cannot
rely on it to support the SYS_HEAPINFO semihosting function. When not
available, fallback to finding a RAM memory region containing the
current stack and use the base of that.
Signed-off-by: Keith Packard <keithp@keithp.com>
---
v2
Explicitly convert 64-bits to 128-bits in find_region_base
for hosts that don't have native 128-bit int type.
---
hw/semihosting/common-semi.c | 43 +++++++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index 33c82f73b1..f09deff4d3 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -137,6 +137,36 @@ typedef struct GuestFD {
static GArray *guestfd_array;
+#ifndef CONFIG_USER_ONLY
+#include "exec/address-spaces.h"
+/*
+ * Find the base of a RAM region containing the specified address
+ */
+static inline hwaddr
+common_semi_find_region_base(hwaddr addr)
+{
+ MemoryRegion *subregion;
+
+ /*
+ * Find the chunk of R/W memory containing the address. This is
+ * used for the SYS_HEAPINFO semihosting call, which should
+ * probably be using information from the loaded application.
+ */
+ QTAILQ_FOREACH(subregion, &get_system_memory()->subregions,
+ subregions_link) {
+ if (subregion->ram && !subregion->readonly) {
+ Int128 top128 = int128_add(int128_make64(subregion->addr),
+ subregion->size);
+ Int128 addr128 = int128_make64(addr);
+ if (subregion->addr <= addr && int128_lt(addr128, top128)) {
+ return subregion->addr;
+ }
+ }
+ }
+ return 0;
+}
+#endif
+
#ifdef TARGET_ARM
static inline target_ulong
common_semi_arg(CPUState *cs, int argno)
@@ -175,7 +205,18 @@ common_semi_rambase(CPUState *cs)
{
CPUArchState *env = cs->env_ptr;
const struct arm_boot_info *info = env->boot_info;
- return info->loader_start;
+ target_ulong sp;
+
+ if (info) {
+ return info->loader_start;
+ }
+
+ if (is_a64(env)) {
+ sp = env->xregs[31];
+ } else {
+ sp = env->regs[13];
+ }
+ return common_semi_find_region_base(sp);
}
#endif
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 5/9] riscv: Add semihosting support
2020-12-14 20:07 ` Keith Packard
@ 2020-12-14 20:07 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, Laurent Vivier, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
Adapt the arm semihosting support code for RISCV. This implementation
is based on the standard for RISC-V semihosting version 0.2 as
documented in
https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
Signed-off-by: Keith Packard <keithp@keithp.com>
---
v2:
Update PC after exception is handled to follow
change in the ARM version for SYS_READC
v3:
Disallow semihosting in user mode; report a regular
breakpoint in that case.
v4:
Fix errors reported by checkpatch
v5:
Reference current RISC-V semihosting specification
v6:
Add support for semihosting in riscv64-linux-user and
riscv32-linux-user
v7:
Add meson build support
v8:
Fix errors reported by checkpatch that crept in.
v9:
Changes suggested by Alistair Francis <alistair23@gmail.com>:
Don't add me to the MAINTAINERS file.
Remove duplicate #include in target/riscv/cpu.h
Reference RISC-V semihosting spec in target/riscv/riscv-semi.c
v10:
Use common semihosting implementation instead of a separate copy.
Make sure addresses of the three breakpoint-signaling
instructions all lie within the same page. Change suggested by
Richard Henderson <richard.henderson@linaro.org>
v11:
Use CONFIG_ARM_COMPATIBLE_SEMIHOSTING
v12:
Fix bug in SYS_EXIT support on rv64
v13:
Add common_semi_rambase implementation. This locates the
memory region containing the stack and uses the base of that.
Fix SET_ARG and GET_ARG on rv64 targets to operate on 64-bit
values rather than 32-bit. Put_user_ual/get_user_ual are
confusingly defined by softmmu-semi.h as being equivalent to
put_user_u32/get_user_u32.
---
default-configs/devices/riscv32-softmmu.mak | 2 +
default-configs/devices/riscv64-softmmu.mak | 2 +
.../targets/riscv32-linux-user.mak | 1 +
.../targets/riscv64-linux-user.mak | 1 +
hw/semihosting/common-semi.c | 82 ++++++++++++++++++-
hw/semihosting/common-semi.h | 5 +-
linux-user/qemu.h | 4 +-
linux-user/semihost.c | 8 +-
qemu-options.hx | 10 ++-
target/riscv/cpu_bits.h | 1 +
target/riscv/cpu_helper.c | 10 +++
.../riscv/insn_trans/trans_privileged.c.inc | 37 ++++++++-
target/riscv/translate.c | 11 +++
13 files changed, 162 insertions(+), 12 deletions(-)
diff --git a/default-configs/devices/riscv32-softmmu.mak b/default-configs/devices/riscv32-softmmu.mak
index 94a236c9c2..d847bd5692 100644
--- a/default-configs/devices/riscv32-softmmu.mak
+++ b/default-configs/devices/riscv32-softmmu.mak
@@ -3,6 +3,8 @@
# Uncomment the following lines to disable these optional devices:
#
#CONFIG_PCI_DEVICES=n
+CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
# Boards:
#
diff --git a/default-configs/devices/riscv64-softmmu.mak b/default-configs/devices/riscv64-softmmu.mak
index 76b6195648..d5eec75f05 100644
--- a/default-configs/devices/riscv64-softmmu.mak
+++ b/default-configs/devices/riscv64-softmmu.mak
@@ -3,6 +3,8 @@
# Uncomment the following lines to disable these optional devices:
#
#CONFIG_PCI_DEVICES=n
+CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
# Boards:
#
diff --git a/default-configs/targets/riscv32-linux-user.mak b/default-configs/targets/riscv32-linux-user.mak
index dfb259e8aa..6a9d1b1bc1 100644
--- a/default-configs/targets/riscv32-linux-user.mak
+++ b/default-configs/targets/riscv32-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=riscv32
TARGET_BASE_ARCH=riscv
TARGET_ABI_DIR=riscv
TARGET_XML_FILES= gdb-xml/riscv-32bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-32bit-csr.xml gdb-xml/riscv-32bit-virtual.xml
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/default-configs/targets/riscv64-linux-user.mak b/default-configs/targets/riscv64-linux-user.mak
index b13895f3b0..0a92849a1b 100644
--- a/default-configs/targets/riscv64-linux-user.mak
+++ b/default-configs/targets/riscv64-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=riscv64
TARGET_BASE_ARCH=riscv
TARGET_ABI_DIR=riscv
TARGET_XML_FILES= gdb-xml/riscv-64bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-64bit-csr.xml gdb-xml/riscv-64bit-virtual.xml
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index f09deff4d3..f0cf5f10f5 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -1,6 +1,6 @@
/*
* Semihosting support for systems modeled on the Arm "Angel"
- * semihosting syscalls design.
+ * semihosting syscalls design. This includes Arm and RISC-V processors
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
@@ -25,6 +25,10 @@
* ARM Semihosting is documented in:
* Semihosting for AArch32 and AArch64 Release 2.0
* https://static.docs.arm.com/100863/0200/semihosting.pdf
+ *
+ * RISC-V Semihosting is documented in:
+ * RISC-V Semihosting
+ * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
*/
#include "qemu/osdep.h"
@@ -222,6 +226,42 @@ common_semi_rambase(CPUState *cs)
#endif /* TARGET_ARM */
+#ifdef TARGET_RISCV
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return env->gpr[xA0 + argno];
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ env->gpr[xA0] = ret;
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
+}
+
+#ifndef CONFIG_USER_ONLY
+
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return common_semi_find_region_base(env->gpr[xSP]);
+}
+#endif
+
+#endif
+
/*
* Allocate a new guest file descriptor and return it; if we
* couldn't allocate a new fd then return -1.
@@ -398,6 +438,12 @@ static target_ulong common_semi_flen_buf(CPUState *cs)
sp = env->regs[13];
}
#endif
+#ifdef TARGET_RISCV
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+
+ sp = env->gpr[xSP];
+#endif
return sp - 64;
}
@@ -741,6 +787,37 @@ static const GuestFDFunctions guestfd_fns[] = {
put_user_u32(val, args + (n) * 4))
#endif
+#ifdef TARGET_RISCV
+
+/*
+ * get_user_ual is defined as get_user_u32 in softmmu-semi.h,
+ * we need a macro that fetches a target_ulong
+ */
+#define get_user_utl(arg, p) \
+ ((sizeof(target_ulong) == 8) ? \
+ get_user_u64(arg, p) : \
+ get_user_u32(arg, p))
+
+/*
+ * put_user_ual is defined as put_user_u32 in softmmu-semi.h,
+ * we need a macro that stores a target_ulong
+ */
+#define put_user_utl(arg, p) \
+ ((sizeof(target_ulong) == 8) ? \
+ put_user_u64(arg, p) : \
+ put_user_u32(arg, p))
+
+#define GET_ARG(n) do { \
+ if (get_user_utl(arg ## n, args + (n) * sizeof(target_ulong))) { \
+ errno = EFAULT; \
+ return set_swi_errno(cs, -1); \
+ } \
+ } while (0)
+
+#define SET_ARG(n, val) \
+ put_user_utl(val, args + (n) * sizeof(target_ulong))
+#endif
+
/*
* Do a semihosting call.
*
@@ -1179,6 +1256,9 @@ target_ulong do_common_semihosting(CPUState *cs)
if (is_a64(cs->env_ptr)) {
return 0;
}
+#endif
+#ifdef TARGET_RISCV
+ return 0;
#endif
/* fall through -- invalid for A32/T32 */
default:
diff --git a/hw/semihosting/common-semi.h b/hw/semihosting/common-semi.h
index bc53e92c79..0bfab1c669 100644
--- a/hw/semihosting/common-semi.h
+++ b/hw/semihosting/common-semi.h
@@ -1,6 +1,6 @@
/*
* Semihosting support for systems modeled on the Arm "Angel"
- * semihosting syscalls design.
+ * semihosting syscalls design. This includes Arm and RISC-V processors
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
@@ -26,6 +26,9 @@
* Semihosting for AArch32 and AArch64 Release 2.0
* https://static.docs.arm.com/100863/0200/semihosting.pdf
*
+ * RISC-V Semihosting is documented in:
+ * RISC-V Semihosting
+ * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
*/
#ifndef COMMON_SEMI_H
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 534753ca12..17aa992165 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -109,6 +109,8 @@ typedef struct TaskState {
/* FPA state */
FPA11 fpa;
# endif
+#endif
+#if defined(TARGET_ARM) || defined(TARGET_RISCV)
int swi_errno;
#endif
#if defined(TARGET_I386) && !defined(TARGET_X86_64)
@@ -122,7 +124,7 @@ typedef struct TaskState {
#ifdef TARGET_M68K
abi_ulong tp_value;
#endif
-#if defined(TARGET_ARM) || defined(TARGET_M68K)
+#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV)
/* Extra fields for semihosted binaries. */
abi_ulong heap_base;
abi_ulong heap_limit;
diff --git a/linux-user/semihost.c b/linux-user/semihost.c
index a1f0f6050e..c0015ee7f6 100644
--- a/linux-user/semihost.c
+++ b/linux-user/semihost.c
@@ -1,11 +1,11 @@
/*
- * ARM Semihosting Console Support
+ * ARM Compatible Semihosting Console Support.
*
* Copyright (c) 2019 Linaro Ltd
*
- * Currently ARM is unique in having support for semihosting support
- * in linux-user. So for now we implement the common console API but
- * just for arm linux-user.
+ * Currently ARM and RISC-V are unique in having support for
+ * semihosting support in linux-user. So for now we implement the
+ * common console API but just for arm and risc-v linux-user.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
diff --git a/qemu-options.hx b/qemu-options.hx
index e60ad42976..329e7597ed 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4186,10 +4186,10 @@ ERST
DEF("semihosting", 0, QEMU_OPTION_semihosting,
"-semihosting semihosting mode\n",
QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
- QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
+ QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
SRST
``-semihosting``
- Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II only).
+ Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V only).
Note that this allows guest direct access to the host filesystem, so
should only be used with a trusted guest OS.
@@ -4201,10 +4201,10 @@ DEF("semihosting-config", HAS_ARG, QEMU_OPTION_semihosting_config,
"-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]\n" \
" semihosting configuration\n",
QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
-QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
+QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
SRST
``-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]``
- Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II
+ Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V
only).
Note that this allows guest direct access to the host filesystem, so
@@ -4219,6 +4219,8 @@ SRST
open/read/write/seek/select. Tensilica baremetal libc for ISS and
linux platform "sim" use this interface.
+ On RISC-V this implements the standard semihosting API, version 0.2.
+
``target=native|gdb|auto``
Defines where the semihosting calls will be addressed, to QEMU
(``native``) or to GDB (``gdb``). The default is ``auto``, which
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 24b24c69c5..f0d3d1c07e 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -544,6 +544,7 @@
#define RISCV_EXCP_INST_PAGE_FAULT 0xc /* since: priv-1.10.0 */
#define RISCV_EXCP_LOAD_PAGE_FAULT 0xd /* since: priv-1.10.0 */
#define RISCV_EXCP_STORE_PAGE_FAULT 0xf /* since: priv-1.10.0 */
+#define RISCV_EXCP_SEMIHOST 0x10
#define RISCV_EXCP_INST_GUEST_PAGE_FAULT 0x14
#define RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT 0x15
#define RISCV_EXCP_VIRT_INSTRUCTION_FAULT 0x16
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index a2787b1d48..e730fd1fe9 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -24,6 +24,7 @@
#include "exec/exec-all.h"
#include "tcg/tcg-op.h"
#include "trace.h"
+#include "hw/semihosting/common-semi.h"
int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
{
@@ -844,6 +845,15 @@ void riscv_cpu_do_interrupt(CPUState *cs)
target_ulong htval = 0;
target_ulong mtval2 = 0;
+ if (cause == RISCV_EXCP_SEMIHOST) {
+ if (env->priv >= PRV_S) {
+ env->gpr[xA0] = do_common_semihosting(cs);
+ env->pc += 4;
+ return;
+ }
+ cause = RISCV_EXCP_BREAKPOINT;
+ }
+
if (!async) {
/* set tval to badaddr for traps with address information */
switch (cause) {
diff --git a/target/riscv/insn_trans/trans_privileged.c.inc b/target/riscv/insn_trans/trans_privileged.c.inc
index 2a61a853bf..32312be202 100644
--- a/target/riscv/insn_trans/trans_privileged.c.inc
+++ b/target/riscv/insn_trans/trans_privileged.c.inc
@@ -29,7 +29,42 @@ static bool trans_ecall(DisasContext *ctx, arg_ecall *a)
static bool trans_ebreak(DisasContext *ctx, arg_ebreak *a)
{
- generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
+ target_ulong ebreak_addr = ctx->base.pc_next;
+ target_ulong pre_addr = ebreak_addr - 4;
+ target_ulong post_addr = ebreak_addr + 4;
+ uint32_t pre = 0;
+ uint32_t ebreak = 0;
+ uint32_t post = 0;
+
+ /*
+ * The RISC-V semihosting spec specifies the following
+ * three-instruction sequence to flag a semihosting call:
+ *
+ * slli zero, zero, 0x1f 0x01f01013
+ * ebreak 0x00100073
+ * srai zero, zero, 0x7 0x40705013
+ *
+ * The two shift operations on the zero register are no-ops, used
+ * here to signify a semihosting exception, rather than a breakpoint.
+ *
+ * Uncompressed instructions are required so that the sequence is easy
+ * to validate.
+ *
+ * The three instructions are required to lie in the same page so
+ * that no exception will be raised when fetching them.
+ */
+
+ if ((pre_addr & TARGET_PAGE_MASK) == (post_addr & TARGET_PAGE_MASK)) {
+ pre = opcode_at(&ctx->base, pre_addr);
+ ebreak = opcode_at(&ctx->base, ebreak_addr);
+ post = opcode_at(&ctx->base, post_addr);
+ }
+
+ if (pre == 0x01f01013 && ebreak == 0x00100073 && post == 0x40705013) {
+ generate_exception(ctx, RISCV_EXCP_SEMIHOST);
+ } else {
+ generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
+ }
exit_tb(ctx); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
return true;
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 554d52a4be..0f28b5f41e 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -64,6 +64,7 @@ typedef struct DisasContext {
uint16_t vlen;
uint16_t mlen;
bool vl_eq_vlmax;
+ CPUState *cs;
} DisasContext;
#ifdef TARGET_RISCV64
@@ -747,6 +748,15 @@ static bool gen_shift(DisasContext *ctx, arg_r *a,
return true;
}
+static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
+{
+ DisasContext *ctx = container_of(dcbase, DisasContext, base);
+ CPUState *cpu = ctx->cs;
+ CPURISCVState *env = cpu->env_ptr;
+
+ return cpu_ldl_code(env, pc);
+}
+
/* Include insn module translation function */
#include "insn_trans/trans_rvi.c.inc"
#include "insn_trans/trans_rvm.c.inc"
@@ -814,6 +824,7 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
ctx->lmul = FIELD_EX32(tb_flags, TB_FLAGS, LMUL);
ctx->mlen = 1 << (ctx->sew + 3 - ctx->lmul);
ctx->vl_eq_vlmax = FIELD_EX32(tb_flags, TB_FLAGS, VL_EQ_VLMAX);
+ ctx->cs = cs;
}
static void riscv_tr_tb_start(DisasContextBase *db, CPUState *cpu)
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 5/9] riscv: Add semihosting support
@ 2020-12-14 20:07 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
Adapt the arm semihosting support code for RISCV. This implementation
is based on the standard for RISC-V semihosting version 0.2 as
documented in
https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
Signed-off-by: Keith Packard <keithp@keithp.com>
---
v2:
Update PC after exception is handled to follow
change in the ARM version for SYS_READC
v3:
Disallow semihosting in user mode; report a regular
breakpoint in that case.
v4:
Fix errors reported by checkpatch
v5:
Reference current RISC-V semihosting specification
v6:
Add support for semihosting in riscv64-linux-user and
riscv32-linux-user
v7:
Add meson build support
v8:
Fix errors reported by checkpatch that crept in.
v9:
Changes suggested by Alistair Francis <alistair23@gmail.com>:
Don't add me to the MAINTAINERS file.
Remove duplicate #include in target/riscv/cpu.h
Reference RISC-V semihosting spec in target/riscv/riscv-semi.c
v10:
Use common semihosting implementation instead of a separate copy.
Make sure addresses of the three breakpoint-signaling
instructions all lie within the same page. Change suggested by
Richard Henderson <richard.henderson@linaro.org>
v11:
Use CONFIG_ARM_COMPATIBLE_SEMIHOSTING
v12:
Fix bug in SYS_EXIT support on rv64
v13:
Add common_semi_rambase implementation. This locates the
memory region containing the stack and uses the base of that.
Fix SET_ARG and GET_ARG on rv64 targets to operate on 64-bit
values rather than 32-bit. Put_user_ual/get_user_ual are
confusingly defined by softmmu-semi.h as being equivalent to
put_user_u32/get_user_u32.
---
default-configs/devices/riscv32-softmmu.mak | 2 +
default-configs/devices/riscv64-softmmu.mak | 2 +
.../targets/riscv32-linux-user.mak | 1 +
.../targets/riscv64-linux-user.mak | 1 +
hw/semihosting/common-semi.c | 82 ++++++++++++++++++-
hw/semihosting/common-semi.h | 5 +-
linux-user/qemu.h | 4 +-
linux-user/semihost.c | 8 +-
qemu-options.hx | 10 ++-
target/riscv/cpu_bits.h | 1 +
target/riscv/cpu_helper.c | 10 +++
.../riscv/insn_trans/trans_privileged.c.inc | 37 ++++++++-
target/riscv/translate.c | 11 +++
13 files changed, 162 insertions(+), 12 deletions(-)
diff --git a/default-configs/devices/riscv32-softmmu.mak b/default-configs/devices/riscv32-softmmu.mak
index 94a236c9c2..d847bd5692 100644
--- a/default-configs/devices/riscv32-softmmu.mak
+++ b/default-configs/devices/riscv32-softmmu.mak
@@ -3,6 +3,8 @@
# Uncomment the following lines to disable these optional devices:
#
#CONFIG_PCI_DEVICES=n
+CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
# Boards:
#
diff --git a/default-configs/devices/riscv64-softmmu.mak b/default-configs/devices/riscv64-softmmu.mak
index 76b6195648..d5eec75f05 100644
--- a/default-configs/devices/riscv64-softmmu.mak
+++ b/default-configs/devices/riscv64-softmmu.mak
@@ -3,6 +3,8 @@
# Uncomment the following lines to disable these optional devices:
#
#CONFIG_PCI_DEVICES=n
+CONFIG_SEMIHOSTING=y
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
# Boards:
#
diff --git a/default-configs/targets/riscv32-linux-user.mak b/default-configs/targets/riscv32-linux-user.mak
index dfb259e8aa..6a9d1b1bc1 100644
--- a/default-configs/targets/riscv32-linux-user.mak
+++ b/default-configs/targets/riscv32-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=riscv32
TARGET_BASE_ARCH=riscv
TARGET_ABI_DIR=riscv
TARGET_XML_FILES= gdb-xml/riscv-32bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-32bit-csr.xml gdb-xml/riscv-32bit-virtual.xml
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/default-configs/targets/riscv64-linux-user.mak b/default-configs/targets/riscv64-linux-user.mak
index b13895f3b0..0a92849a1b 100644
--- a/default-configs/targets/riscv64-linux-user.mak
+++ b/default-configs/targets/riscv64-linux-user.mak
@@ -2,3 +2,4 @@ TARGET_ARCH=riscv64
TARGET_BASE_ARCH=riscv
TARGET_ABI_DIR=riscv
TARGET_XML_FILES= gdb-xml/riscv-64bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-64bit-csr.xml gdb-xml/riscv-64bit-virtual.xml
+CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index f09deff4d3..f0cf5f10f5 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -1,6 +1,6 @@
/*
* Semihosting support for systems modeled on the Arm "Angel"
- * semihosting syscalls design.
+ * semihosting syscalls design. This includes Arm and RISC-V processors
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
@@ -25,6 +25,10 @@
* ARM Semihosting is documented in:
* Semihosting for AArch32 and AArch64 Release 2.0
* https://static.docs.arm.com/100863/0200/semihosting.pdf
+ *
+ * RISC-V Semihosting is documented in:
+ * RISC-V Semihosting
+ * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
*/
#include "qemu/osdep.h"
@@ -222,6 +226,42 @@ common_semi_rambase(CPUState *cs)
#endif /* TARGET_ARM */
+#ifdef TARGET_RISCV
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return env->gpr[xA0 + argno];
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ env->gpr[xA0] = ret;
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
+}
+
+#ifndef CONFIG_USER_ONLY
+
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return common_semi_find_region_base(env->gpr[xSP]);
+}
+#endif
+
+#endif
+
/*
* Allocate a new guest file descriptor and return it; if we
* couldn't allocate a new fd then return -1.
@@ -398,6 +438,12 @@ static target_ulong common_semi_flen_buf(CPUState *cs)
sp = env->regs[13];
}
#endif
+#ifdef TARGET_RISCV
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+
+ sp = env->gpr[xSP];
+#endif
return sp - 64;
}
@@ -741,6 +787,37 @@ static const GuestFDFunctions guestfd_fns[] = {
put_user_u32(val, args + (n) * 4))
#endif
+#ifdef TARGET_RISCV
+
+/*
+ * get_user_ual is defined as get_user_u32 in softmmu-semi.h,
+ * we need a macro that fetches a target_ulong
+ */
+#define get_user_utl(arg, p) \
+ ((sizeof(target_ulong) == 8) ? \
+ get_user_u64(arg, p) : \
+ get_user_u32(arg, p))
+
+/*
+ * put_user_ual is defined as put_user_u32 in softmmu-semi.h,
+ * we need a macro that stores a target_ulong
+ */
+#define put_user_utl(arg, p) \
+ ((sizeof(target_ulong) == 8) ? \
+ put_user_u64(arg, p) : \
+ put_user_u32(arg, p))
+
+#define GET_ARG(n) do { \
+ if (get_user_utl(arg ## n, args + (n) * sizeof(target_ulong))) { \
+ errno = EFAULT; \
+ return set_swi_errno(cs, -1); \
+ } \
+ } while (0)
+
+#define SET_ARG(n, val) \
+ put_user_utl(val, args + (n) * sizeof(target_ulong))
+#endif
+
/*
* Do a semihosting call.
*
@@ -1179,6 +1256,9 @@ target_ulong do_common_semihosting(CPUState *cs)
if (is_a64(cs->env_ptr)) {
return 0;
}
+#endif
+#ifdef TARGET_RISCV
+ return 0;
#endif
/* fall through -- invalid for A32/T32 */
default:
diff --git a/hw/semihosting/common-semi.h b/hw/semihosting/common-semi.h
index bc53e92c79..0bfab1c669 100644
--- a/hw/semihosting/common-semi.h
+++ b/hw/semihosting/common-semi.h
@@ -1,6 +1,6 @@
/*
* Semihosting support for systems modeled on the Arm "Angel"
- * semihosting syscalls design.
+ * semihosting syscalls design. This includes Arm and RISC-V processors
*
* Copyright (c) 2005, 2007 CodeSourcery.
* Copyright (c) 2019 Linaro
@@ -26,6 +26,9 @@
* Semihosting for AArch32 and AArch64 Release 2.0
* https://static.docs.arm.com/100863/0200/semihosting.pdf
*
+ * RISC-V Semihosting is documented in:
+ * RISC-V Semihosting
+ * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
*/
#ifndef COMMON_SEMI_H
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 534753ca12..17aa992165 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -109,6 +109,8 @@ typedef struct TaskState {
/* FPA state */
FPA11 fpa;
# endif
+#endif
+#if defined(TARGET_ARM) || defined(TARGET_RISCV)
int swi_errno;
#endif
#if defined(TARGET_I386) && !defined(TARGET_X86_64)
@@ -122,7 +124,7 @@ typedef struct TaskState {
#ifdef TARGET_M68K
abi_ulong tp_value;
#endif
-#if defined(TARGET_ARM) || defined(TARGET_M68K)
+#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV)
/* Extra fields for semihosted binaries. */
abi_ulong heap_base;
abi_ulong heap_limit;
diff --git a/linux-user/semihost.c b/linux-user/semihost.c
index a1f0f6050e..c0015ee7f6 100644
--- a/linux-user/semihost.c
+++ b/linux-user/semihost.c
@@ -1,11 +1,11 @@
/*
- * ARM Semihosting Console Support
+ * ARM Compatible Semihosting Console Support.
*
* Copyright (c) 2019 Linaro Ltd
*
- * Currently ARM is unique in having support for semihosting support
- * in linux-user. So for now we implement the common console API but
- * just for arm linux-user.
+ * Currently ARM and RISC-V are unique in having support for
+ * semihosting support in linux-user. So for now we implement the
+ * common console API but just for arm and risc-v linux-user.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
diff --git a/qemu-options.hx b/qemu-options.hx
index e60ad42976..329e7597ed 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4186,10 +4186,10 @@ ERST
DEF("semihosting", 0, QEMU_OPTION_semihosting,
"-semihosting semihosting mode\n",
QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
- QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
+ QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
SRST
``-semihosting``
- Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II only).
+ Enable semihosting mode (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V only).
Note that this allows guest direct access to the host filesystem, so
should only be used with a trusted guest OS.
@@ -4201,10 +4201,10 @@ DEF("semihosting-config", HAS_ARG, QEMU_OPTION_semihosting_config,
"-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]\n" \
" semihosting configuration\n",
QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
-QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2)
+QEMU_ARCH_MIPS | QEMU_ARCH_NIOS2 | QEMU_ARCH_RISCV)
SRST
``-semihosting-config [enable=on|off][,target=native|gdb|auto][,chardev=id][,arg=str[,...]]``
- Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II
+ Enable and configure semihosting (ARM, M68K, Xtensa, MIPS, Nios II, RISC-V
only).
Note that this allows guest direct access to the host filesystem, so
@@ -4219,6 +4219,8 @@ SRST
open/read/write/seek/select. Tensilica baremetal libc for ISS and
linux platform "sim" use this interface.
+ On RISC-V this implements the standard semihosting API, version 0.2.
+
``target=native|gdb|auto``
Defines where the semihosting calls will be addressed, to QEMU
(``native``) or to GDB (``gdb``). The default is ``auto``, which
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 24b24c69c5..f0d3d1c07e 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -544,6 +544,7 @@
#define RISCV_EXCP_INST_PAGE_FAULT 0xc /* since: priv-1.10.0 */
#define RISCV_EXCP_LOAD_PAGE_FAULT 0xd /* since: priv-1.10.0 */
#define RISCV_EXCP_STORE_PAGE_FAULT 0xf /* since: priv-1.10.0 */
+#define RISCV_EXCP_SEMIHOST 0x10
#define RISCV_EXCP_INST_GUEST_PAGE_FAULT 0x14
#define RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT 0x15
#define RISCV_EXCP_VIRT_INSTRUCTION_FAULT 0x16
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index a2787b1d48..e730fd1fe9 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -24,6 +24,7 @@
#include "exec/exec-all.h"
#include "tcg/tcg-op.h"
#include "trace.h"
+#include "hw/semihosting/common-semi.h"
int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
{
@@ -844,6 +845,15 @@ void riscv_cpu_do_interrupt(CPUState *cs)
target_ulong htval = 0;
target_ulong mtval2 = 0;
+ if (cause == RISCV_EXCP_SEMIHOST) {
+ if (env->priv >= PRV_S) {
+ env->gpr[xA0] = do_common_semihosting(cs);
+ env->pc += 4;
+ return;
+ }
+ cause = RISCV_EXCP_BREAKPOINT;
+ }
+
if (!async) {
/* set tval to badaddr for traps with address information */
switch (cause) {
diff --git a/target/riscv/insn_trans/trans_privileged.c.inc b/target/riscv/insn_trans/trans_privileged.c.inc
index 2a61a853bf..32312be202 100644
--- a/target/riscv/insn_trans/trans_privileged.c.inc
+++ b/target/riscv/insn_trans/trans_privileged.c.inc
@@ -29,7 +29,42 @@ static bool trans_ecall(DisasContext *ctx, arg_ecall *a)
static bool trans_ebreak(DisasContext *ctx, arg_ebreak *a)
{
- generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
+ target_ulong ebreak_addr = ctx->base.pc_next;
+ target_ulong pre_addr = ebreak_addr - 4;
+ target_ulong post_addr = ebreak_addr + 4;
+ uint32_t pre = 0;
+ uint32_t ebreak = 0;
+ uint32_t post = 0;
+
+ /*
+ * The RISC-V semihosting spec specifies the following
+ * three-instruction sequence to flag a semihosting call:
+ *
+ * slli zero, zero, 0x1f 0x01f01013
+ * ebreak 0x00100073
+ * srai zero, zero, 0x7 0x40705013
+ *
+ * The two shift operations on the zero register are no-ops, used
+ * here to signify a semihosting exception, rather than a breakpoint.
+ *
+ * Uncompressed instructions are required so that the sequence is easy
+ * to validate.
+ *
+ * The three instructions are required to lie in the same page so
+ * that no exception will be raised when fetching them.
+ */
+
+ if ((pre_addr & TARGET_PAGE_MASK) == (post_addr & TARGET_PAGE_MASK)) {
+ pre = opcode_at(&ctx->base, pre_addr);
+ ebreak = opcode_at(&ctx->base, ebreak_addr);
+ post = opcode_at(&ctx->base, post_addr);
+ }
+
+ if (pre == 0x01f01013 && ebreak == 0x00100073 && post == 0x40705013) {
+ generate_exception(ctx, RISCV_EXCP_SEMIHOST);
+ } else {
+ generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
+ }
exit_tb(ctx); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
return true;
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 554d52a4be..0f28b5f41e 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -64,6 +64,7 @@ typedef struct DisasContext {
uint16_t vlen;
uint16_t mlen;
bool vl_eq_vlmax;
+ CPUState *cs;
} DisasContext;
#ifdef TARGET_RISCV64
@@ -747,6 +748,15 @@ static bool gen_shift(DisasContext *ctx, arg_r *a,
return true;
}
+static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
+{
+ DisasContext *ctx = container_of(dcbase, DisasContext, base);
+ CPUState *cpu = ctx->cs;
+ CPURISCVState *env = cpu->env_ptr;
+
+ return cpu_ldl_code(env, pc);
+}
+
/* Include insn module translation function */
#include "insn_trans/trans_rvi.c.inc"
#include "insn_trans/trans_rvm.c.inc"
@@ -814,6 +824,7 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
ctx->lmul = FIELD_EX32(tb_flags, TB_FLAGS, LMUL);
ctx->mlen = 1 << (ctx->sew + 3 - ctx->lmul);
ctx->vl_eq_vlmax = FIELD_EX32(tb_flags, TB_FLAGS, VL_EQ_VLMAX);
+ ctx->cs = cs;
}
static void riscv_tr_tb_start(DisasContextBase *db, CPUState *cpu)
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 6/9] riscv: Add semihosting support for user mode
2020-12-14 20:07 ` Keith Packard
@ 2020-12-14 20:07 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, Laurent Vivier, qemu-arm, Alistair Francis,
Palmer Dabbelt, Kito Cheng, Alex Bennée
From: Kito Cheng <kito.cheng@sifive.com>
This could made testing more easier and ARM/AArch64 has supported on
their linux user mode too, so I think it should be reasonable.
Verified GCC testsuite with newlib/semihosting.
Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
---
linux-user/riscv/cpu_loop.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c
index aa9e437875..9665dabb09 100644
--- a/linux-user/riscv/cpu_loop.c
+++ b/linux-user/riscv/cpu_loop.c
@@ -23,6 +23,7 @@
#include "qemu.h"
#include "cpu_loop-common.h"
#include "elf.h"
+#include "hw/semihosting/common-semi.h"
void cpu_loop(CPURISCVState *env)
{
@@ -91,6 +92,10 @@ void cpu_loop(CPURISCVState *env)
sigcode = TARGET_SEGV_MAPERR;
sigaddr = env->badaddr;
break;
+ case RISCV_EXCP_SEMIHOST:
+ env->gpr[xA0] = do_common_semihosting(cs);
+ env->pc += 4;
+ break;
case EXCP_DEBUG:
gdbstep:
signum = TARGET_SIGTRAP;
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 6/9] riscv: Add semihosting support for user mode
@ 2020-12-14 20:07 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Kito Cheng, Keith Packard
From: Kito Cheng <kito.cheng@sifive.com>
This could made testing more easier and ARM/AArch64 has supported on
their linux user mode too, so I think it should be reasonable.
Verified GCC testsuite with newlib/semihosting.
Signed-off-by: Kito Cheng <kito.cheng@sifive.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
---
linux-user/riscv/cpu_loop.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c
index aa9e437875..9665dabb09 100644
--- a/linux-user/riscv/cpu_loop.c
+++ b/linux-user/riscv/cpu_loop.c
@@ -23,6 +23,7 @@
#include "qemu.h"
#include "cpu_loop-common.h"
#include "elf.h"
+#include "hw/semihosting/common-semi.h"
void cpu_loop(CPURISCVState *env)
{
@@ -91,6 +92,10 @@ void cpu_loop(CPURISCVState *env)
sigcode = TARGET_SEGV_MAPERR;
sigaddr = env->badaddr;
break;
+ case RISCV_EXCP_SEMIHOST:
+ env->gpr[xA0] = do_common_semihosting(cs);
+ env->pc += 4;
+ break;
case EXCP_DEBUG:
gdbstep:
signum = TARGET_SIGTRAP;
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 7/9] semihosting: Implement SYS_ELAPSED and SYS_TICKFREQ
2020-12-14 20:07 ` Keith Packard
@ 2020-12-14 20:07 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, Laurent Vivier, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
These are part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 16 ++++++++++++++++
include/qemu/timer.h | 2 ++
util/qemu-timer-common.c | 4 ++++
3 files changed, 22 insertions(+)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index f0cf5f10f5..b1368d945c 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -38,6 +38,7 @@
#include "hw/semihosting/console.h"
#include "hw/semihosting/common-semi.h"
#include "qemu/log.h"
+#include "qemu/timer.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
@@ -73,6 +74,8 @@
#define TARGET_SYS_EXIT 0x18
#define TARGET_SYS_SYNCCACHE 0x19
#define TARGET_SYS_EXIT_EXTENDED 0x20
+#define TARGET_SYS_ELAPSED 0x30
+#define TARGET_SYS_TICKFREQ 0x31
/* ADP_Stopped_ApplicationExit is used for exit(0),
* anything else is implemented as exit(1) */
@@ -837,6 +840,7 @@ target_ulong do_common_semihosting(CPUState *cs)
uint32_t ret;
uint32_t len;
GuestFD *gf;
+ int64_t elapsed;
(void) env; /* Used implicitly by arm lock_user macro */
nr = common_semi_arg(cs, 0) & 0xffffffffU;
@@ -1246,6 +1250,18 @@ target_ulong do_common_semihosting(CPUState *cs)
}
gdb_exit(cs->env_ptr, ret);
exit(ret);
+ case TARGET_SYS_ELAPSED:
+ elapsed = get_clock() - clock_start;
+ if (sizeof(target_ulong) == 8) {
+ SET_ARG(0, elapsed);
+ } else {
+ SET_ARG(0, (uint32_t) elapsed);
+ SET_ARG(1, (uint32_t) (elapsed >> 32));
+ }
+ return 0;
+ case TARGET_SYS_TICKFREQ:
+ /* qemu always uses nsec */
+ return 1000000000;
case TARGET_SYS_SYNCCACHE:
/*
* Clean the D-cache and invalidate the I-cache for the specified
diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index bdecc5b41f..ca6fae51f1 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -806,6 +806,8 @@ static inline int64_t get_clock_realtime(void)
return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
}
+extern int64_t clock_start;
+
/* Warning: don't insert tracepoints into these functions, they are
also used by simpletrace backend and tracepoints would cause
an infinite recursion! */
diff --git a/util/qemu-timer-common.c b/util/qemu-timer-common.c
index baf3317f74..cc1326f726 100644
--- a/util/qemu-timer-common.c
+++ b/util/qemu-timer-common.c
@@ -27,6 +27,8 @@
/***********************************************************/
/* real time host monotonic timer */
+int64_t clock_start;
+
#ifdef _WIN32
int64_t clock_freq;
@@ -41,6 +43,7 @@ static void __attribute__((constructor)) init_get_clock(void)
exit(1);
}
clock_freq = freq.QuadPart;
+ clock_start = get_clock();
}
#else
@@ -55,5 +58,6 @@ static void __attribute__((constructor)) init_get_clock(void)
if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
use_rt_clock = 1;
}
+ clock_start = get_clock();
}
#endif
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 7/9] semihosting: Implement SYS_ELAPSED and SYS_TICKFREQ
@ 2020-12-14 20:07 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
These are part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 16 ++++++++++++++++
include/qemu/timer.h | 2 ++
util/qemu-timer-common.c | 4 ++++
3 files changed, 22 insertions(+)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index f0cf5f10f5..b1368d945c 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -38,6 +38,7 @@
#include "hw/semihosting/console.h"
#include "hw/semihosting/common-semi.h"
#include "qemu/log.h"
+#include "qemu/timer.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
@@ -73,6 +74,8 @@
#define TARGET_SYS_EXIT 0x18
#define TARGET_SYS_SYNCCACHE 0x19
#define TARGET_SYS_EXIT_EXTENDED 0x20
+#define TARGET_SYS_ELAPSED 0x30
+#define TARGET_SYS_TICKFREQ 0x31
/* ADP_Stopped_ApplicationExit is used for exit(0),
* anything else is implemented as exit(1) */
@@ -837,6 +840,7 @@ target_ulong do_common_semihosting(CPUState *cs)
uint32_t ret;
uint32_t len;
GuestFD *gf;
+ int64_t elapsed;
(void) env; /* Used implicitly by arm lock_user macro */
nr = common_semi_arg(cs, 0) & 0xffffffffU;
@@ -1246,6 +1250,18 @@ target_ulong do_common_semihosting(CPUState *cs)
}
gdb_exit(cs->env_ptr, ret);
exit(ret);
+ case TARGET_SYS_ELAPSED:
+ elapsed = get_clock() - clock_start;
+ if (sizeof(target_ulong) == 8) {
+ SET_ARG(0, elapsed);
+ } else {
+ SET_ARG(0, (uint32_t) elapsed);
+ SET_ARG(1, (uint32_t) (elapsed >> 32));
+ }
+ return 0;
+ case TARGET_SYS_TICKFREQ:
+ /* qemu always uses nsec */
+ return 1000000000;
case TARGET_SYS_SYNCCACHE:
/*
* Clean the D-cache and invalidate the I-cache for the specified
diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index bdecc5b41f..ca6fae51f1 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -806,6 +806,8 @@ static inline int64_t get_clock_realtime(void)
return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
}
+extern int64_t clock_start;
+
/* Warning: don't insert tracepoints into these functions, they are
also used by simpletrace backend and tracepoints would cause
an infinite recursion! */
diff --git a/util/qemu-timer-common.c b/util/qemu-timer-common.c
index baf3317f74..cc1326f726 100644
--- a/util/qemu-timer-common.c
+++ b/util/qemu-timer-common.c
@@ -27,6 +27,8 @@
/***********************************************************/
/* real time host monotonic timer */
+int64_t clock_start;
+
#ifdef _WIN32
int64_t clock_freq;
@@ -41,6 +43,7 @@ static void __attribute__((constructor)) init_get_clock(void)
exit(1);
}
clock_freq = freq.QuadPart;
+ clock_start = get_clock();
}
#else
@@ -55,5 +58,6 @@ static void __attribute__((constructor)) init_get_clock(void)
if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
use_rt_clock = 1;
}
+ clock_start = get_clock();
}
#endif
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 8/9] semihosting: Implement SYS_TMPNAM
2020-12-14 20:07 ` Keith Packard
@ 2020-12-14 20:07 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, Laurent Vivier, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
Part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index b1368d945c..b0648c3812 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -835,6 +835,7 @@ target_ulong do_common_semihosting(CPUState *cs)
CPUArchState *env = cs->env_ptr;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
+ target_ulong ul_ret;
char * s;
int nr;
uint32_t ret;
@@ -998,8 +999,24 @@ target_ulong do_common_semihosting(CPUState *cs)
return guestfd_fns[gf->type].flenfn(cs, gf);
case TARGET_SYS_TMPNAM:
- qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
- return -1;
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ if (asprintf(&s, "/tmp/qemu-%x%02x", getpid(),
+ (int) (arg1 & 0xff)) < 0) {
+ return -1;
+ }
+ ul_ret = (target_ulong) -1;
+
+ /* Make sure there's enough space in the buffer */
+ if (strlen(s) < arg2) {
+ char *output = lock_user(VERIFY_WRITE, arg0, arg2, 0);
+ strcpy(output, s);
+ unlock_user(output, arg0, arg2);
+ ul_ret = 0;
+ }
+ free(s);
+ return ul_ret;
case TARGET_SYS_REMOVE:
GET_ARG(0);
GET_ARG(1);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 8/9] semihosting: Implement SYS_TMPNAM
@ 2020-12-14 20:07 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
Part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index b1368d945c..b0648c3812 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -835,6 +835,7 @@ target_ulong do_common_semihosting(CPUState *cs)
CPUArchState *env = cs->env_ptr;
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
+ target_ulong ul_ret;
char * s;
int nr;
uint32_t ret;
@@ -998,8 +999,24 @@ target_ulong do_common_semihosting(CPUState *cs)
return guestfd_fns[gf->type].flenfn(cs, gf);
case TARGET_SYS_TMPNAM:
- qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
- return -1;
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ if (asprintf(&s, "/tmp/qemu-%x%02x", getpid(),
+ (int) (arg1 & 0xff)) < 0) {
+ return -1;
+ }
+ ul_ret = (target_ulong) -1;
+
+ /* Make sure there's enough space in the buffer */
+ if (strlen(s) < arg2) {
+ char *output = lock_user(VERIFY_WRITE, arg0, arg2, 0);
+ strcpy(output, s);
+ unlock_user(output, arg0, arg2);
+ ul_ret = 0;
+ }
+ free(s);
+ return ul_ret;
case TARGET_SYS_REMOVE:
GET_ARG(0);
GET_ARG(1);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 9/9] semihosting: Implement SYS_ISERROR
2020-12-14 20:07 ` Keith Packard
@ 2020-12-14 20:07 ` Keith Packard
-1 siblings, 0 replies; 54+ messages in thread
From: Keith Packard via @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, Keith Packard, qemu-riscv, Sagar Karandikar,
Bastian Koppelmann, Laurent Vivier, qemu-arm, Alistair Francis,
Palmer Dabbelt, Alex Bennée
Part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index b0648c3812..abc15bf219 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -59,6 +59,7 @@
#define TARGET_SYS_WRITE 0x05
#define TARGET_SYS_READ 0x06
#define TARGET_SYS_READC 0x07
+#define TARGET_SYS_ISERROR 0x08
#define TARGET_SYS_ISTTY 0x09
#define TARGET_SYS_SEEK 0x0a
#define TARGET_SYS_FLEN 0x0c
@@ -967,6 +968,9 @@ target_ulong do_common_semihosting(CPUState *cs)
return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
case TARGET_SYS_READC:
return qemu_semihosting_console_inc(cs->env_ptr);
+ case TARGET_SYS_ISERROR:
+ GET_ARG(0);
+ return (target_long) arg0 < 0 ? 1 : 0;
case TARGET_SYS_ISTTY:
GET_ARG(0);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
* [PATCH 9/9] semihosting: Implement SYS_ISERROR
@ 2020-12-14 20:07 ` Keith Packard
0 siblings, 0 replies; 54+ messages in thread
From: Keith Packard @ 2020-12-14 20:07 UTC (permalink / raw)
To: qemu-devel
Cc: Alex Bennée, Alistair Francis, Bastian Koppelmann,
Laurent Vivier, Palmer Dabbelt, Peter Maydell, qemu-arm,
qemu-riscv, Sagar Karandikar, Keith Packard
Part of Semihosting for AArch32 and AArch64 Release 2.0
Signed-off-by: Keith Packard <keithp@keithp.com>
---
hw/semihosting/common-semi.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/hw/semihosting/common-semi.c b/hw/semihosting/common-semi.c
index b0648c3812..abc15bf219 100644
--- a/hw/semihosting/common-semi.c
+++ b/hw/semihosting/common-semi.c
@@ -59,6 +59,7 @@
#define TARGET_SYS_WRITE 0x05
#define TARGET_SYS_READ 0x06
#define TARGET_SYS_READC 0x07
+#define TARGET_SYS_ISERROR 0x08
#define TARGET_SYS_ISTTY 0x09
#define TARGET_SYS_SEEK 0x0a
#define TARGET_SYS_FLEN 0x0c
@@ -967,6 +968,9 @@ target_ulong do_common_semihosting(CPUState *cs)
return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
case TARGET_SYS_READC:
return qemu_semihosting_console_inc(cs->env_ptr);
+ case TARGET_SYS_ISERROR:
+ GET_ARG(0);
+ return (target_long) arg0 < 0 ? 1 : 0;
case TARGET_SYS_ISTTY:
GET_ARG(0);
--
2.29.2
^ permalink raw reply related [flat|nested] 54+ messages in thread
end of thread, other threads:[~2020-12-14 20:18 UTC | newest]
Thread overview: 54+ messages (download: mbox.gz / follow: Atom feed)
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2020-11-25 21:36 [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0 Keith Packard via
2020-11-25 21:36 ` Keith Packard
2020-11-25 21:36 ` [PATCH 1/8] semihosting: Move ARM semihosting code to shared directories [v3] Keith Packard via
2020-11-25 21:36 ` Keith Packard
2020-11-25 21:36 ` [PATCH 2/8] semihosting: Change common-semi API to be architecture-independent Keith Packard via
2020-11-25 21:36 ` Keith Packard
2020-11-25 21:36 ` [PATCH 3/8] semihosting: Change internal common-semi interfaces to use CPUState * [v2] Keith Packard via
2020-11-25 21:36 ` Keith Packard
2020-11-25 21:36 ` [PATCH 4/8] semihosting: Support SYS_HEAPINFO when env->boot_info is not set Keith Packard via
2020-11-25 21:36 ` Keith Packard
2020-11-25 21:36 ` [PATCH 5/8] riscv: Add semihosting support [v13] Keith Packard via
2020-11-25 21:36 ` Keith Packard
2020-12-09 7:58 ` Kito Cheng
2020-12-09 7:58 ` Kito Cheng
2020-12-09 16:29 ` Keith Packard via
2020-12-09 16:29 ` Keith Packard
2020-12-10 3:39 ` Kito Cheng
2020-12-10 3:39 ` Kito Cheng
2020-12-10 6:21 ` Keith Packard via
2020-12-10 6:21 ` Keith Packard
2020-12-14 11:29 ` Alex Bennée
2020-12-14 11:29 ` Alex Bennée
2020-11-25 21:36 ` [PATCH 6/8] semihosting: Implement SYS_ELAPSED and SYS_TICKFREQ Keith Packard via
2020-11-25 21:36 ` Keith Packard
2020-11-25 21:36 ` [PATCH 7/8] semihosting: Implement SYS_TMPNAM Keith Packard via
2020-11-25 21:36 ` Keith Packard
2020-11-25 21:36 ` [PATCH 8/8] semihosting: Implement SYS_ISERROR Keith Packard via
2020-11-25 21:36 ` Keith Packard
2020-12-14 11:24 ` [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0 Alex Bennée
2020-12-14 11:24 ` Alex Bennée
2020-12-14 14:58 ` Alex Bennée
2020-12-14 14:58 ` Alex Bennée
2020-12-14 20:06 ` Keith Packard via
2020-12-14 20:06 ` Keith Packard
2020-12-14 20:07 ` [PATCH 0/9] " Keith Packard via
2020-12-14 20:07 ` Keith Packard
2020-12-14 20:07 ` [PATCH 1/9] semihosting: Move ARM semihosting code to shared directories Keith Packard via
2020-12-14 20:07 ` Keith Packard
2020-12-14 20:07 ` [PATCH 2/9] semihosting: Change common-semi API to be architecture-independent Keith Packard via
2020-12-14 20:07 ` Keith Packard
2020-12-14 20:07 ` [PATCH 3/9] semihosting: Change internal common-semi interfaces to use CPUState * Keith Packard via
2020-12-14 20:07 ` Keith Packard
2020-12-14 20:07 ` [PATCH 4/9] semihosting: Support SYS_HEAPINFO when env->boot_info is not set Keith Packard via
2020-12-14 20:07 ` Keith Packard
2020-12-14 20:07 ` [PATCH 5/9] riscv: Add semihosting support Keith Packard via
2020-12-14 20:07 ` Keith Packard
2020-12-14 20:07 ` [PATCH 6/9] riscv: Add semihosting support for user mode Keith Packard via
2020-12-14 20:07 ` Keith Packard
2020-12-14 20:07 ` [PATCH 7/9] semihosting: Implement SYS_ELAPSED and SYS_TICKFREQ Keith Packard via
2020-12-14 20:07 ` Keith Packard
2020-12-14 20:07 ` [PATCH 8/9] semihosting: Implement SYS_TMPNAM Keith Packard via
2020-12-14 20:07 ` Keith Packard
2020-12-14 20:07 ` [PATCH 9/9] semihosting: Implement SYS_ISERROR Keith Packard via
2020-12-14 20:07 ` Keith Packard
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