From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, qemu-s390x@nongnu.org,
"Alex Bennée" <alex.bennee@linaro.org>,
laurent@vivier.eu, "Philippe Mathieu-Daudé" <f4bug@amsat.org>
Subject: [PATCH v3 23/27] linux-user/s390x: Implement setup_sigtramp
Date: Fri, 24 Sep 2021 12:59:22 -0400 [thread overview]
Message-ID: <20210924165926.752809-24-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210924165926.752809-1-richard.henderson@linaro.org>
Create and record the two signal trampolines.
Use them when the guest does not use SA_RESTORER.
Cc: qemu-s390x@nongnu.org
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/s390x/target_signal.h | 2 ++
linux-user/s390x/signal.c | 24 ++++++++++++++++--------
2 files changed, 18 insertions(+), 8 deletions(-)
diff --git a/linux-user/s390x/target_signal.h b/linux-user/s390x/target_signal.h
index bbfc464d44..64f5f42201 100644
--- a/linux-user/s390x/target_signal.h
+++ b/linux-user/s390x/target_signal.h
@@ -19,4 +19,6 @@ typedef struct target_sigaltstack {
#include "../generic/signal.h"
#define TARGET_ARCH_HAS_SETUP_FRAME
+#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
+
#endif /* S390X_TARGET_SIGNAL_H */
diff --git a/linux-user/s390x/signal.c b/linux-user/s390x/signal.c
index 80f34086d7..676b948147 100644
--- a/linux-user/s390x/signal.c
+++ b/linux-user/s390x/signal.c
@@ -68,7 +68,6 @@ typedef struct {
target_sigregs sregs;
int signo;
target_sigregs_ext sregs_ext;
- uint16_t retcode;
} sigframe;
#define TARGET_UC_VXRS 2
@@ -85,7 +84,6 @@ struct target_ucontext {
typedef struct {
uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
- uint16_t retcode;
struct target_siginfo info;
struct target_ucontext uc;
} rt_sigframe;
@@ -209,9 +207,7 @@ void setup_frame(int sig, struct target_sigaction *ka,
if (ka->sa_flags & TARGET_SA_RESTORER) {
restorer = ka->sa_restorer;
} else {
- restorer = frame_addr + offsetof(sigframe, retcode);
- __put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn,
- &frame->retcode);
+ restorer = default_sigreturn;
}
/* Set up registers for signal handler */
@@ -262,9 +258,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
if (ka->sa_flags & TARGET_SA_RESTORER) {
restorer = ka->sa_restorer;
} else {
- restorer = frame_addr + offsetof(typeof(*frame), retcode);
- __put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn,
- &frame->retcode);
+ restorer = default_rt_sigreturn;
}
/* Create siginfo on the signal stack. */
@@ -405,3 +399,17 @@ long do_rt_sigreturn(CPUS390XState *env)
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
}
+
+void setup_sigtramp(abi_ulong sigtramp_page)
+{
+ uint16_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 2 + 2, 0);
+ assert(tramp != NULL);
+
+ default_sigreturn = sigtramp_page;
+ __put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn, &tramp[0]);
+
+ default_rt_sigreturn = sigtramp_page + 2;
+ __put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn, &tramp[1]);
+
+ unlock_user(tramp, sigtramp_page, 2 + 2);
+}
--
2.25.1
next prev parent reply other threads:[~2021-09-24 17:19 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-24 16:58 [PATCH v3 00/27] linux-user: Move signal trampolines to new page Richard Henderson
2021-09-24 16:59 ` [PATCH v3 01/27] linux-user: Add infrastructure for a signal trampoline page Richard Henderson
2021-09-24 16:59 ` [PATCH v3 02/27] linux-user/aarch64: Implement setup_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 03/27] linux-user/arm: Drop v1 signal frames Richard Henderson
2021-09-24 16:59 ` [PATCH v3 04/27] linux-user/arm: Drop "_v2" from symbols in signal.c Richard Henderson
2021-09-24 16:59 ` [PATCH v3 05/27] linux-user/arm: Implement setup_sigtramp Richard Henderson
2021-09-27 11:06 ` Peter Maydell
2021-09-24 16:59 ` [PATCH v3 06/27] linux-user/alpha: " Richard Henderson
2021-09-24 16:59 ` [PATCH v3 07/27] linux-user/cris: " Richard Henderson
2021-09-24 16:59 ` [PATCH v3 08/27] linux-user/hexagon: " Richard Henderson
2021-09-24 18:49 ` Taylor Simpson
2021-09-24 16:59 ` [PATCH v3 09/27] linux-user/hppa: Document non-use of setup_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 10/27] linux-user/i386: Implement setup_sigtramp Richard Henderson
2021-09-24 18:01 ` Philippe Mathieu-Daudé
2021-09-28 1:42 ` Richard Henderson
2021-09-28 6:50 ` Philippe Mathieu-Daudé
2021-09-24 16:59 ` [PATCH v3 11/27] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set Richard Henderson
2021-09-27 13:01 ` Peter Maydell
2021-09-24 16:59 ` [PATCH v3 12/27] linux-user/m68k: Implement setup_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 13/27] linux-user/microblaze: " Richard Henderson
2021-09-24 16:59 ` [PATCH v3 14/27] linux-user/mips: Tidy install_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 15/27] linux-user/mips: Implement setup_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 16/27] linux-user/nios2: Properly emulate EXCP_TRAP Richard Henderson
2021-09-27 13:23 ` Peter Maydell
2021-09-27 14:30 ` Richard Henderson
2021-09-24 16:59 ` [PATCH v3 17/27] linux-user/nios2: Map a real kuser page Richard Henderson
2021-09-27 13:26 ` Peter Maydell
2021-09-27 13:59 ` Richard Henderson
2021-09-24 16:59 ` [PATCH v3 18/27] linux-user/nios2: Fixes for signal frame setup Richard Henderson
2021-09-27 13:28 ` Peter Maydell
2021-09-24 16:59 ` [PATCH v3 19/27] linux-user/openrisc: Implement setup_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 20/27] linux-user/ppc: Simplify encode_trampoline Richard Henderson
2021-09-24 17:55 ` Philippe Mathieu-Daudé
2021-09-24 16:59 ` [PATCH v3 21/27] linux-user/ppc: Implement setup_sigtramp Richard Henderson
2021-09-27 13:34 ` Peter Maydell
2021-09-24 16:59 ` [PATCH v3 22/27] linux-user/riscv: " Richard Henderson
2021-09-24 16:59 ` Richard Henderson [this message]
2021-09-24 16:59 ` [PATCH v3 24/27] linux-user/sh4: " Richard Henderson
2021-09-24 16:59 ` [PATCH v3 25/27] linux-user/sparc: " Richard Henderson
2021-09-27 13:30 ` Peter Maydell
2021-09-24 16:59 ` [PATCH v3 26/27] linux-user/xtensa: " Richard Henderson
2021-09-24 17:53 ` Philippe Mathieu-Daudé
2021-09-24 16:59 ` [PATCH v3 27/27] linux-user: Remove default for TARGET_ARCH_HAS_SIGTRAMP_PAGE Richard Henderson
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