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target/i386: implement SYSCALL/SYSRET in 32-bit emulators

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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>
This commit is contained in:
Paolo Bonzini 2023-06-17 01:01:29 +02:00
parent 6750485bf4
commit 63fd8ef080
8 changed files with 20 additions and 17 deletions
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2
target/i386/tcg/user/seg_helper.c
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@ -26,7 +26,6 @@
#include "tcg/helper-tcg.h"
#include "tcg/seg_helper.h"
#ifdef TARGET_X86_64
void helper_syscall(CPUX86State *env, int next_eip_addend)
{
CPUState *cs = env_cpu(env);
@ -36,7 +35,6 @@ void helper_syscall(CPUX86State *env, int next_eip_addend)
env->exception_next_eip = env->eip + next_eip_addend;
cpu_loop_exit(cs);
}
#endif /* TARGET_X86_64 */
/*
* fake user mode interrupt. is_int is TRUE if coming from the int