From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: laurent@vivier.eu, "Philippe Mathieu-Daudé" <f4bug@amsat.org>
Subject: [PATCH v2 01/41] accel/tcg: Split out adjust_signal_pc
Date: Sat, 18 Sep 2021 11:44:47 -0700 [thread overview]
Message-ID: <20210918184527.408540-2-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210918184527.408540-1-richard.henderson@linaro.org>
Split out a function to adjust the raw signal pc into a
value that could be passed to cpu_restore_state.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
v2: Adjust pc in place; return MMUAccessType.
---
include/exec/exec-all.h | 10 ++++++++++
accel/tcg/user-exec.c | 41 +++++++++++++++++++++++++----------------
2 files changed, 35 insertions(+), 16 deletions(-)
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index 9d5987ba04..e54f8e5d65 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -663,6 +663,16 @@ static inline tb_page_addr_t get_page_addr_code_hostp(CPUArchState *env,
return addr;
}
+/**
+ * adjust_signal_pc:
+ * @pc: raw pc from the host signal ucontext_t.
+ * @is_write: host memory operation was write, or read-modify-write.
+ *
+ * Alter @pc as required for unwinding. Return the type of the
+ * guest memory access -- host reads may be for guest execution.
+ */
+MMUAccessType adjust_signal_pc(uintptr_t *pc, bool is_write);
+
/**
* cpu_signal_handler
* @signum: host signal number
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index 8fed542622..cef025d001 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -57,18 +57,11 @@ static void QEMU_NORETURN cpu_exit_tb_from_sighandler(CPUState *cpu,
cpu_loop_exit_noexc(cpu);
}
-/* 'pc' is the host PC at which the exception was raised. 'address' is
- the effective address of the memory exception. 'is_write' is 1 if a
- write caused the exception and otherwise 0'. 'old_set' is the
- signal set which should be restored */
-static inline int handle_cpu_signal(uintptr_t pc, siginfo_t *info,
- int is_write, sigset_t *old_set)
+/*
+ * Adjust the pc to pass to cpu_restore_state; return the memop type.
+ */
+MMUAccessType adjust_signal_pc(uintptr_t *pc, bool is_write)
{
- CPUState *cpu = current_cpu;
- CPUClass *cc;
- unsigned long address = (unsigned long)info->si_addr;
- MMUAccessType access_type = is_write ? MMU_DATA_STORE : MMU_DATA_LOAD;
-
switch (helper_retaddr) {
default:
/*
@@ -77,7 +70,7 @@ static inline int handle_cpu_signal(uintptr_t pc, siginfo_t *info,
* pointer into the generated code that will unwind to the
* correct guest pc.
*/
- pc = helper_retaddr;
+ *pc = helper_retaddr;
break;
case 0:
@@ -97,7 +90,7 @@ static inline int handle_cpu_signal(uintptr_t pc, siginfo_t *info,
* Therefore, adjust to compensate for what will be done later
* by cpu_restore_state_from_tb.
*/
- pc += GETPC_ADJ;
+ *pc += GETPC_ADJ;
break;
case 1:
@@ -113,12 +106,28 @@ static inline int handle_cpu_signal(uintptr_t pc, siginfo_t *info,
*
* Like tb_gen_code, release the memory lock before cpu_loop_exit.
*/
- pc = 0;
- access_type = MMU_INST_FETCH;
mmap_unlock();
- break;
+ *pc = 0;
+ return MMU_INST_FETCH;
}
+ return is_write ? MMU_DATA_STORE : MMU_DATA_LOAD;
+}
+
+/*
+ * 'pc' is the host PC at which the exception was raised.
+ * 'address' is the effective address of the memory exception.
+ * 'is_write' is 1 if a write caused the exception and otherwise 0.
+ * 'old_set' is the signal set which should be restored.
+ */
+static inline int handle_cpu_signal(uintptr_t pc, siginfo_t *info,
+ int is_write, sigset_t *old_set)
+{
+ CPUState *cpu = current_cpu;
+ CPUClass *cc;
+ unsigned long address = (unsigned long)info->si_addr;
+ MMUAccessType access_type = adjust_signal_pc(&pc, is_write);
+
/* For synchronous signals we expect to be coming from the vCPU
* thread (so current_cpu should be valid) and either from running
* code or during translation which can fault as we cross pages.
--
2.25.1
next prev parent reply other threads:[~2021-09-18 18:48 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-18 18:44 [PATCH v2 00/41] linux-user: Streamline handling of SIGSEGV Richard Henderson
2021-09-18 18:44 ` Richard Henderson [this message]
2021-09-18 18:44 ` [PATCH v2 02/41] accel/tcg: Move clear_helper_retaddr to cpu loop Richard Henderson
2021-09-19 19:35 ` Warner Losh
2021-09-18 18:44 ` [PATCH v2 03/41] accel/tcg: Split out handle_sigsegv_accerr_write Richard Henderson
2021-09-18 18:44 ` [PATCH v2 04/41] accel/tcg: Fold cpu_exit_tb_from_sighandler into caller Richard Henderson
2021-09-18 18:44 ` [PATCH v2 05/41] configure: Merge riscv32 and riscv64 host architectures Richard Henderson
2021-09-19 17:56 ` Philippe Mathieu-Daudé
2021-09-19 22:57 ` Alistair Francis
2021-09-18 18:44 ` [PATCH v2 06/41] linux-user: Reorg handling for SIGSEGV Richard Henderson
2021-09-19 18:02 ` Philippe Mathieu-Daudé
2021-09-19 19:01 ` Warner Losh
2021-09-19 23:01 ` Alistair Francis
2021-09-18 18:44 ` [PATCH v2 07/41] linux-user/host/x86: Populate host_signal.h Richard Henderson
2021-09-18 18:44 ` [PATCH v2 08/41] linux-user/host/ppc: " Richard Henderson
2021-09-19 19:34 ` Warner Losh
2021-09-18 18:44 ` [PATCH v2 09/41] linux-user/host/alpha: " Richard Henderson
2021-09-19 18:03 ` Philippe Mathieu-Daudé
2021-09-19 18:07 ` Richard Henderson
2021-09-19 18:11 ` Philippe Mathieu-Daudé
2021-09-19 18:13 ` Philippe Mathieu-Daudé
2021-09-18 18:44 ` [PATCH v2 10/41] linux-user/host/sparc: " Richard Henderson
2021-09-18 18:44 ` [PATCH v2 11/41] linux-user/host/arm: " Richard Henderson
2021-09-18 18:44 ` [PATCH v2 12/41] linux-user/host/aarch64: " Richard Henderson
2021-09-18 18:44 ` [PATCH v2 13/41] linux-user/host/s390: " Richard Henderson
2021-09-19 18:07 ` Philippe Mathieu-Daudé
2021-09-18 18:45 ` [PATCH v2 14/41] linux-user/host/mips: " Richard Henderson
2021-09-19 18:08 ` Philippe Mathieu-Daudé
2021-09-18 18:45 ` [PATCH v2 15/41] linux-user/host/riscv: " Richard Henderson
2021-09-18 18:45 ` [PATCH v2 16/41] target/arm: Fixup comment re handle_cpu_signal Richard Henderson
2021-09-18 18:45 ` [PATCH v2 17/41] linux-user/host/riscv: Improve host_signal_write Richard Henderson
2021-09-18 18:45 ` [PATCH v2 18/41] linux-user/signal: Drop HOST_SIGNAL_PLACEHOLDER Richard Henderson
2021-09-19 18:18 ` Philippe Mathieu-Daudé
2021-09-19 18:59 ` Warner Losh
2021-09-18 18:45 ` [PATCH v2 19/41] hw/core: Add TCGCPUOps.record_sigsegv Richard Henderson
2021-09-19 18:22 ` Philippe Mathieu-Daudé
2021-09-19 18:24 ` Philippe Mathieu-Daudé
2021-09-19 18:32 ` Richard Henderson
2021-09-18 18:45 ` [PATCH v2 20/41] linux-user: Add raise_sigsegv Richard Henderson
2021-09-19 18:26 ` Philippe Mathieu-Daudé
2021-09-19 18:35 ` Richard Henderson
2021-09-19 18:43 ` Philippe Mathieu-Daudé
2021-09-19 18:53 ` Warner Losh
2021-09-18 18:45 ` [PATCH v2 21/41] target/alpha: Make alpha_cpu_tlb_fill sysemu only Richard Henderson
2021-09-18 18:45 ` [PATCH v2 22/41] target/arm: Use raise_sigsegv for mte tag lookup Richard Henderson
2021-09-18 18:45 ` [PATCH v2 23/41] target/arm: Implement arm_cpu_record_sigsegv Richard Henderson
2021-09-18 18:45 ` [PATCH v2 24/41] target/cris: Make cris_cpu_tlb_fill sysemu only Richard Henderson
2021-09-19 18:28 ` Philippe Mathieu-Daudé
2021-09-18 18:45 ` [PATCH v2 25/41] target/hexagon: Remove hexagon_cpu_tlb_fill Richard Henderson
2021-09-18 18:45 ` [PATCH v2 26/41] target/hppa: Make hppa_cpu_tlb_fill sysemu only Richard Henderson
2021-09-18 18:45 ` [PATCH v2 27/41] target/i386: Implement x86_cpu_record_sigsegv Richard Henderson
2021-09-19 18:32 ` Philippe Mathieu-Daudé
2021-09-19 18:59 ` Warner Losh
2021-09-18 18:45 ` [PATCH v2 28/41] target/m68k: Make m68k_cpu_tlb_fill sysemu only Richard Henderson
2021-09-18 18:45 ` [PATCH v2 29/41] target/microblaze: Make mb_cpu_tlb_fill " Richard Henderson
2021-09-18 18:45 ` [PATCH v2 30/41] target/mips: Make mips_cpu_tlb_fill " Richard Henderson
2021-09-18 18:45 ` [PATCH v2 31/41] target/nios2: Make nios2_cpu_tlb_fill " Richard Henderson
2021-09-18 18:45 ` [PATCH v2 32/41] linux-user/openrisc: Adjust signal for EXCP_RANGE, EXCP_FPE Richard Henderson
2021-09-18 18:45 ` [PATCH v2 33/41] target/openrisc: Make openrisc_cpu_tlb_fill sysemu only Richard Henderson
2021-09-18 18:45 ` [PATCH v2 34/41] target/ppc: Implement ppc_cpu_record_sigsegv Richard Henderson
2021-09-19 18:37 ` Philippe Mathieu-Daudé
2021-09-18 18:45 ` [PATCH v2 35/41] target/riscv: Make riscv_cpu_tlb_fill sysemu only Richard Henderson
2021-09-18 18:45 ` [PATCH v2 36/41] target/s390x: Use probe_access_flags in s390_probe_access Richard Henderson
2021-09-18 18:45 ` [PATCH v2 37/41] target/s390x: Implement s390_cpu_record_sigsegv Richard Henderson
2021-09-19 18:39 ` Philippe Mathieu-Daudé
2021-09-18 18:45 ` [PATCH v2 38/41] target/sh4: Make sh4_cpu_tlb_fill sysemu only Richard Henderson
2021-09-18 18:45 ` [PATCH v2 39/41] target/sparc: Make sparc_cpu_tlb_fill " Richard Henderson
2021-09-18 18:45 ` [PATCH v2 40/41] target/xtensa: Make xtensa_cpu_tlb_fill " Richard Henderson
2021-09-18 18:45 ` [PATCH v2 41/41] accel/tcg: Restrict TCGCPUOps::tlb_fill() to sysemu Richard Henderson
2021-09-19 18:40 ` Philippe Mathieu-Daudé
2021-09-19 10:38 ` [PATCH v2 00/41] linux-user: Streamline handling of SIGSEGV Philippe Mathieu-Daudé
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