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disasm: correctly handle VEX and XOP based opcodes

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This commit is contained in:
Stanislav Shwartsman 2011-11-23 19:43:50 +00:00
parent 7158cf7228
commit 62b811e48f
1 changed files with 27 additions and 26 deletions
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53
bochs/disasm/dis_decode.cc
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@ -326,42 +326,43 @@ x86_insn disassembler::decode(bx_bool is_32, bx_bool is_64, bx_address base, bx_
{
Bit8u prefix_byte = *(instr+i);
if (prefix_byte == 0xF0) {
const BxDisasmOpcodeTable_t *prefix = &(opcode_table[prefix_byte]);
dis_sprintf("%s ", OPCODE(prefix)->IntelOpcode);
}
if (prefix_byte == 0xF0) dis_sprintf("lock ");
if (insn.b1 == 0x90 && !insn.rex_b && prefix_byte == 0xF3)
continue;
if (! insn.is_xop && ! insn.is_vex) {
if (insn.b1 == 0x90 && !insn.rex_b && prefix_byte == 0xF3)
continue;
if (prefix_byte == 0xF3 || prefix_byte == 0xF2) {
if (! sse_opcode) {
const BxDisasmOpcodeTable_t *prefix = &(opcode_table[prefix_byte]);
dis_sprintf("%s ", OPCODE(prefix)->IntelOpcode);
if (prefix_byte == 0xF3 || prefix_byte == 0xF2) {
if (! sse_opcode) {
const BxDisasmOpcodeTable_t *prefix = &(opcode_table[prefix_byte]);
dis_sprintf("%s ", OPCODE(prefix)->IntelOpcode);
}
}
}
// branch hint for jcc instructions
if ((insn.b1 >= 0x070 && insn.b1 <= 0x07F) ||
(insn.b1 >= 0x180 && insn.b1 <= 0x18F))
{
if (prefix_byte == BRANCH_NOT_TAKEN || prefix_byte == BRANCH_TAKEN)
branch_hint = prefix_byte;
// branch hint for jcc instructions
if ((insn.b1 >= 0x070 && insn.b1 <= 0x07F) ||
(insn.b1 >= 0x180 && insn.b1 <= 0x18F))
{
if (prefix_byte == BRANCH_NOT_TAKEN || prefix_byte == BRANCH_TAKEN)
branch_hint = prefix_byte;
}
}
}
const BxDisasmOpcodeInfo_t *opcode = OPCODE(entry);
// patch jecx opcode
if (insn.b1 == 0xE3 && insn.as_32 && !insn.as_64)
opcode = &Ia_jecxz_Jb;
if (! insn.is_xop && ! insn.is_vex) {
// patch jecx opcode
if (insn.b1 == 0xE3 && insn.as_32 && !insn.as_64)
opcode = &Ia_jecxz_Jb;
// fix nop opcode
if (insn.b1 == 0x90) {
if (sse_prefix == SSE_PREFIX_F3)
opcode = &Ia_pause;
else if (!insn.rex_b)
opcode = &Ia_nop;
// fix nop opcode
if (insn.b1 == 0x90) {
if (sse_prefix == SSE_PREFIX_F3)
opcode = &Ia_pause;
else if (!insn.rex_b)
opcode = &Ia_nop;
}
}
// print instruction disassembly