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linux-user/i386: Emulate x86_64 vsyscalls

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Notice the magic page during translate, much like we already
do for the arm32 commpage.  At runtime, raise an exception to
return cpu_loop for emulation.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200213032223.14643-4-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2020-02-12 19:22:21 -08:00 • committed by Laurent Vivier
parent acf768a904
commit b26491b4d4
3 changed files with 128 additions and 1 deletions
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7
target/i386/cpu.h
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@ -1003,6 +1003,7 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS];
#define EXCP_VMEXIT 0x100 /* only for system emulation */
#define EXCP_SYSCALL 0x101 /* only for user emulation */
#define EXCP_VSYSCALL 0x102 /* only for user emulation */
/* i386-specific interrupt pending bits. */
#define CPU_INTERRUPT_POLL CPU_INTERRUPT_TGT_EXT_1
@ -2218,4 +2219,10 @@ static inline bool hyperv_feat_enabled(X86CPU *cpu, int feat)
return !!(cpu->hyperv_features & BIT(feat));
}
#if defined(TARGET_X86_64) && \
defined(CONFIG_USER_ONLY) && \
defined(CONFIG_LINUX)
# define TARGET_VSYSCALL_PAGE (UINT64_C(-10) << 20)
#endif
#endif /* I386_CPU_H */