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| author | Paolo Bonzini <pbonzini@redhat.com> | 2023-06-17 01:01:29 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-06-26 10:23:56 +0200 |
| commit | 63fd8ef080351357c0cb0644ed63fd3e2a8833a8 (patch) | |
| tree | 91481e0107c3a469373c997a838c7796d71fd2f5 /linux-user | |
| parent | 6750485bf42a9917a29487aec899687669104e07 (diff) | |
| download | qemu-63fd8ef080351357c0cb0644ed63fd3e2a8833a8.zip qemu-63fd8ef080351357c0cb0644ed63fd3e2a8833a8.tar.gz qemu-63fd8ef080351357c0cb0644ed63fd3e2a8833a8.tar.bz2 | |
target/i386: implement SYSCALL/SYSRET in 32-bit emulators
AMD supports both 32-bit and 64-bit SYSCALL/SYSRET, but the TCG only
exposes it for 64-bit targets. For system emulation just reuse the
helper; for user-mode emulation the ABI is the same as "int $80".
The BSDs does not support any fast system call mechanism in 32-bit
mode so add to bsd-user the same stub that FreeBSD has for 64-bit
compatibility mode.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/i386/cpu_loop.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/linux-user/i386/cpu_loop.c b/linux-user/i386/cpu_loop.c index 2d0918a..9eeda55 100644 --- a/linux-user/i386/cpu_loop.c +++ b/linux-user/i386/cpu_loop.c @@ -211,6 +211,9 @@ void cpu_loop(CPUX86State *env) switch(trapnr) { case 0x80: +#ifndef TARGET_X86_64 + case EXCP_SYSCALL: +#endif /* linux syscall from int $0x80 */ ret = do_syscall(env, env->regs[R_EAX], @@ -227,9 +230,9 @@ void cpu_loop(CPUX86State *env) env->regs[R_EAX] = ret; } break; -#ifndef TARGET_ABI32 +#ifdef TARGET_X86_64 case EXCP_SYSCALL: - /* linux syscall from syscall instruction */ + /* linux syscall from syscall instruction. */ ret = do_syscall(env, env->regs[R_EAX], env->regs[R_EDI], @@ -245,8 +248,6 @@ void cpu_loop(CPUX86State *env) env->regs[R_EAX] = ret; } break; -#endif -#ifdef TARGET_X86_64 case EXCP_VSYSCALL: emulate_vsyscall(env); break; |