diff options
| -rw-r--r-- | target-i386/translate.c | 134 |
1 files changed, 52 insertions, 82 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c index f667f9333b..e5cda94805 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -4267,44 +4267,44 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s, next_byte: b = cpu_ldub_code(env, s->pc); s->pc++; - /* check prefixes */ + /* Collect prefixes. */ + switch (b) { + case 0xf3: + prefixes |= PREFIX_REPZ; + goto next_byte; + case 0xf2: + prefixes |= PREFIX_REPNZ; + goto next_byte; + case 0xf0: + prefixes |= PREFIX_LOCK; + goto next_byte; + case 0x2e: + s->override = R_CS; + goto next_byte; + case 0x36: + s->override = R_SS; + goto next_byte; + case 0x3e: + s->override = R_DS; + goto next_byte; + case 0x26: + s->override = R_ES; + goto next_byte; + case 0x64: + s->override = R_FS; + goto next_byte; + case 0x65: + s->override = R_GS; + goto next_byte; + case 0x66: + prefixes |= PREFIX_DATA; + goto next_byte; + case 0x67: + prefixes |= PREFIX_ADR; + goto next_byte; #ifdef TARGET_X86_64 - if (CODE64(s)) { - switch (b) { - case 0xf3: - prefixes |= PREFIX_REPZ; - goto next_byte; - case 0xf2: - prefixes |= PREFIX_REPNZ; - goto next_byte; - case 0xf0: - prefixes |= PREFIX_LOCK; - goto next_byte; - case 0x2e: - s->override = R_CS; - goto next_byte; - case 0x36: - s->override = R_SS; - goto next_byte; - case 0x3e: - s->override = R_DS; - goto next_byte; - case 0x26: - s->override = R_ES; - goto next_byte; - case 0x64: - s->override = R_FS; - goto next_byte; - case 0x65: - s->override = R_GS; - goto next_byte; - case 0x66: - prefixes |= PREFIX_DATA; - goto next_byte; - case 0x67: - prefixes |= PREFIX_ADR; - goto next_byte; - case 0x40 ... 0x4f: + case 0x40 ... 0x4f: + if (CODE64(s)) { /* REX prefix */ rex_w = (b >> 3) & 1; rex_r = (b & 0x4) << 1; @@ -4313,58 +4313,28 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s, x86_64_hregs = 1; /* select uniform byte register addressing */ goto next_byte; } + break; +#endif + } + + /* Post-process prefixes. */ + if (prefixes & PREFIX_DATA) { + dflag ^= 1; + } + if (prefixes & PREFIX_ADR) { + aflag ^= 1; + } +#ifdef TARGET_X86_64 + if (CODE64(s)) { if (rex_w == 1) { /* 0x66 is ignored if rex.w is set */ dflag = 2; - } else { - if (prefixes & PREFIX_DATA) - dflag ^= 1; } - if (!(prefixes & PREFIX_ADR)) + if (!(prefixes & PREFIX_ADR)) { aflag = 2; - } else -#endif - { - switch (b) { - case 0xf3: - prefixes |= PREFIX_REPZ; - goto next_byte; - case 0xf2: - prefixes |= PREFIX_REPNZ; - goto next_byte; - case 0xf0: - prefixes |= PREFIX_LOCK; - goto next_byte; - case 0x2e: - s->override = R_CS; - goto next_byte; - case 0x36: - s->override = R_SS; - goto next_byte; - case 0x3e: - s->override = R_DS; - goto next_byte; - case 0x26: - s->override = R_ES; - goto next_byte; - case 0x64: - s->override = R_FS; - goto next_byte; - case 0x65: - s->override = R_GS; - goto next_byte; - case 0x66: - prefixes |= PREFIX_DATA; - goto next_byte; - case 0x67: - prefixes |= PREFIX_ADR; - goto next_byte; } - if (prefixes & PREFIX_DATA) - dflag ^= 1; - if (prefixes & PREFIX_ADR) - aflag ^= 1; } +#endif s->prefix = prefixes; s->aflag = aflag; |