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linux-user/i386: Emulate orig_ax

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The kernel uses orig_rax/orig_eax to store the syscall number before
a syscall. One can see this value in core dumps and ptrace.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-ID: <20240912093012.402366-3-iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Ilya Leoshkevich 2024-09-12 11:28:21 +02:00 • committed by Richard Henderson
parent f781af3b14
commit 3674bfadb5
3 changed files with 9 additions and 2 deletions
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3
linux-user/i386/cpu_loop.c
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@ -172,6 +172,7 @@ static void emulate_vsyscall(CPUX86State *env)
/*
* Perform the syscall. None of the vsyscalls should need restarting.
*/
get_task_state(env_cpu(env))->orig_ax = syscall;
ret = do_syscall(env, syscall, env->regs[R_EDI], env->regs[R_ESI],
env->regs[R_EDX], env->regs[10], env->regs[8],
env->regs[9], 0, 0);
@ -221,6 +222,7 @@ void cpu_loop(CPUX86State *env)
case EXCP_SYSCALL:
#endif
/* linux syscall from int $0x80 */
get_task_state(cs)->orig_ax = env->regs[R_EAX];
ret = do_syscall(env,
env->regs[R_EAX],
env->regs[R_EBX],
@ -239,6 +241,7 @@ void cpu_loop(CPUX86State *env)
#ifdef TARGET_X86_64
case EXCP_SYSCALL:
/* linux syscall from syscall instruction. */
get_task_state(cs)->orig_ax = env->regs[R_EAX];
ret = do_syscall(env,
env->regs[R_EAX],
env->regs[R_EDI],