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Diffstat (limited to 'target-i386/translate.c')
-rw-r--r--target-i386/translate.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c
index b400d2470a..c6d9be6043 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -7716,10 +7716,21 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
}
break;
case 5: /* lfence */
- case 6: /* mfence */
if ((modrm & 0xc7) != 0xc0 || !(s->cpuid_features & CPUID_SSE2))
goto illegal_op;
break;
+ case 6: /* mfence/clwb */
+ if (s->prefix & PREFIX_DATA) {
+ /* clwb */
+ if (!(s->cpuid_7_0_ebx_features & CPUID_7_0_EBX_CLWB))
+ goto illegal_op;
+ gen_nop_modrm(env, s, modrm);
+ } else {
+ /* mfence */
+ if ((modrm & 0xc7) != 0xc0 || !(s->cpuid_features & CPUID_SSE2))
+ goto illegal_op;
+ }
+ break;
case 7: /* sfence / clflush */
if ((modrm & 0xc7) == 0xc0) {
/* sfence */