diff options
Diffstat (limited to 'target-i386/translate.c')
| -rw-r--r-- | target-i386/translate.c | 68 |
1 files changed, 64 insertions, 4 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c index e5cda94805..f824b9916f 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -37,6 +37,7 @@ #define PREFIX_LOCK 0x04 #define PREFIX_DATA 0x08 #define PREFIX_ADR 0x10 +#define PREFIX_VEX 0x20 #ifdef TARGET_X86_64 #define CODE64(s) ((s)->code64) @@ -98,6 +99,8 @@ typedef struct DisasContext { int code64; /* 64 bit code segment */ int rex_x, rex_b; #endif + int vex_l; /* vex vector length */ + int vex_v; /* vex vvvv register, without 1's compliment. */ int ss32; /* 32 bit stack segment */ CCOp cc_op; /* current CC operation */ bool cc_op_dirty; @@ -4264,6 +4267,8 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s, x86_64_hregs = 0; #endif s->rip_offset = 0; /* for relative ip address */ + s->vex_l = 0; + s->vex_v = 0; next_byte: b = cpu_ldub_code(env, s->pc); s->pc++; @@ -4315,6 +4320,63 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s, } break; #endif + case 0xc5: /* 2-byte VEX */ + case 0xc4: /* 3-byte VEX */ + /* VEX prefixes cannot be used except in 32-bit mode. + Otherwise the instruction is LES or LDS. */ + if (s->code32 && !s->vm86) { + static const int pp_prefix[4] = { + 0, PREFIX_DATA, PREFIX_REPZ, PREFIX_REPNZ + }; + int vex3, vex2 = cpu_ldub_code(env, s->pc); + + if (!CODE64(s) && (vex2 & 0xc0) != 0xc0) { + /* 4.1.4.6: In 32-bit mode, bits [7:6] must be 11b, + otherwise the instruction is LES or LDS. */ + break; + } + s->pc++; + + /* 4.1.1-4.1.3: No preceeding lock, 66, f2, f3, or rex prefixes. */ + if (prefixes & (PREFIX_REPZ | PREFIX_REPNZ + | PREFIX_LOCK | PREFIX_DATA)) { + goto illegal_op; + } +#ifdef TARGET_X86_64 + if (x86_64_hregs) { + goto illegal_op; + } +#endif + rex_r = (~vex2 >> 4) & 8; + if (b == 0xc5) { + vex3 = vex2; + b = cpu_ldub_code(env, s->pc++); + } else { +#ifdef TARGET_X86_64 + s->rex_x = (~vex2 >> 3) & 8; + s->rex_b = (~vex2 >> 2) & 8; +#endif + vex3 = cpu_ldub_code(env, s->pc++); + rex_w = (vex3 >> 7) & 1; + switch (vex2 & 0x1f) { + case 0x01: /* Implied 0f leading opcode bytes. */ + b = cpu_ldub_code(env, s->pc++) | 0x100; + break; + case 0x02: /* Implied 0f 38 leading opcode bytes. */ + b = 0x138; + break; + case 0x03: /* Implied 0f 3a leading opcode bytes. */ + b = 0x13a; + break; + default: /* Reserved for future use. */ + goto illegal_op; + } + } + s->vex_v = (~vex3 >> 3) & 0xf; + s->vex_l = (vex3 >> 2) & 1; + prefixes |= pp_prefix[vex3 & 3] | PREFIX_VEX; + } + break; } /* Post-process prefixes. */ @@ -5461,13 +5523,11 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s, } break; case 0xc4: /* les Gv */ - if (CODE64(s)) - goto illegal_op; + /* In CODE64 this is VEX3; see above. */ op = R_ES; goto do_lxx; case 0xc5: /* lds Gv */ - if (CODE64(s)) - goto illegal_op; + /* In CODE64 this is VEX2; see above. */ op = R_DS; goto do_lxx; case 0x1b2: /* lss Gv */ |