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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 /target/i386/cpu.c | |
| parent | 6750485bf42a9917a29487aec899687669104e07 (diff) | |
| download | focaccia-qemu-63fd8ef080351357c0cb0644ed63fd3e2a8833a8.tar.gz focaccia-qemu-63fd8ef080351357c0cb0644ed63fd3e2a8833a8.zip | |
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 'target/i386/cpu.c')
| -rw-r--r-- | target/i386/cpu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 4d52e612ac..c0fb6b3ad9 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -637,7 +637,7 @@ void x86_cpu_vendor_words2str(char *dst, uint32_t vendor1, CPUID_EXT_X2APIC, CPUID_EXT_TSC_DEADLINE_TIMER */ #ifdef TARGET_X86_64 -#define TCG_EXT2_X86_64_FEATURES (CPUID_EXT2_SYSCALL | CPUID_EXT2_LM) +#define TCG_EXT2_X86_64_FEATURES CPUID_EXT2_LM #else #define TCG_EXT2_X86_64_FEATURES 0 #endif @@ -645,7 +645,7 @@ void x86_cpu_vendor_words2str(char *dst, uint32_t vendor1, #define TCG_EXT2_FEATURES ((TCG_FEATURES & CPUID_EXT2_AMD_ALIASES) | \ CPUID_EXT2_NX | CPUID_EXT2_MMXEXT | CPUID_EXT2_RDTSCP | \ CPUID_EXT2_3DNOW | CPUID_EXT2_3DNOWEXT | CPUID_EXT2_PDPE1GB | \ - TCG_EXT2_X86_64_FEATURES) + CPUID_EXT2_SYSCALL | TCG_EXT2_X86_64_FEATURES) #define TCG_EXT3_FEATURES (CPUID_EXT3_LAHF_LM | CPUID_EXT3_SVM | \ CPUID_EXT3_CR8LEG | CPUID_EXT3_ABM | CPUID_EXT3_SSE4A | \ CPUID_EXT3_3DNOWPREFETCH) |