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zydis
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Minor optimizations and bugfixes 

- Fixed `XCHG R8, RAX` falsely beeing decoded as `NOP`
- Fixed `EVEX/MVEX.R'` not beeing ignored in 16- and 32-bit mode
- Removed some unnecessary conditions from operand-action related code
This commit is contained in:
flobernd 2018-01-17 00:31:32 +01:00
parent 7074e363f0
commit 61f607e1df
No known key found for this signature in database
GPG Key ID: 9C3AE0ED4A969F10
2 changed files with 27 additions and 5 deletions
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30
src/Decoder.c
View File

@ -1994,7 +1994,7 @@ FinalizeOperand:
#if !defined(ZYDIS_DISABLE_EVEX) || !defined(ZYDIS_DISABLE_MVEX)
// Fix operand-action for EVEX instructions with merge-mask
if (((instruction->encoding == ZYDIS_INSTRUCTION_ENCODING_EVEX) ||
/*if (((instruction->encoding == ZYDIS_INSTRUCTION_ENCODING_EVEX) ||
(instruction->encoding == ZYDIS_INSTRUCTION_ENCODING_MVEX)) &&
(instruction->avx.mask.mode == ZYDIS_MASK_MODE_MERGE) &&
(instruction->operandCount >= 3) &&
@ -2027,6 +2027,28 @@ FinalizeOperand:
default:
break;
}
}*/
if (instruction->avx.mask.reg && (instruction->avx.mask.mode == ZYDIS_MASK_MODE_MERGE) &&
!instruction->avx.mask.isControlMask)
{
ZYDIS_ASSERT(instruction->operandCount >= 2);
switch (instruction->operands[0].action)
{
case ZYDIS_OPERAND_ACTION_WRITE:
if (instruction->operands[0].type == ZYDIS_OPERAND_TYPE_MEMORY)
{
instruction->operands[0].action = ZYDIS_OPERAND_ACTION_CONDWRITE;
} else
{
instruction->operands[0].action = ZYDIS_OPERAND_ACTION_READ_CONDWRITE;
}
break;
case ZYDIS_OPERAND_ACTION_READWRITE:
instruction->operands[0].action = ZYDIS_OPERAND_ACTION_READ_CONDWRITE;
break;
default:
break;
}
}
#endif
@ -4152,7 +4174,7 @@ static ZydisStatus ZydisCheckErrorConditions(ZydisDecoderContext* context,
case ZYDIS_REG_CONSTRAINTS_NONE:
break;
case ZYDIS_REG_CONSTRAINTS_GPR:
if (context->cache.R2)
if ((context->decoder->machineMode == ZYDIS_MACHINE_MODE_LONG_64) && context->cache.R2)
{
return ZYDIS_STATUS_BAD_REGISTER;
}
@ -4198,8 +4220,8 @@ static ZydisStatus ZydisCheckErrorConditions(ZydisDecoderContext* context,
}
break;
case ZYDIS_REG_CONSTRAINTS_MASK:
// TODO: ZYDIS_ASSERT(!context->cache.R2) ?
if (context->cache.R || context->cache.R2)
if ((context->decoder->machineMode == ZYDIS_MACHINE_MODE_LONG_64) &&
(context->cache.R || context->cache.R2))
{
return ZYDIS_STATUS_BAD_REGISTER;
}

2
src/Generated/DecoderTables.inc
View File

@ -2620,7 +2620,7 @@ const ZydisDecoderTreeNode filtersMandatoryPrefix[][5] =
{ ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_OPERAND_SIZE, 0x5), ZYDIS_INVALID, ZYDIS_INVALID, ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_OPERAND_SIZE, 0x6), ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_OPERAND_SIZE, 0x7) },
{ ZYDIS_DEFINITION(0x0, 0x3E4), ZYDIS_INVALID, ZYDIS_INVALID, ZYDIS_DEFINITION(0x0, 0x3E5), ZYDIS_DEFINITION(0x0, 0x3E6) },
{ ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_OPERAND_SIZE, 0x8), ZYDIS_INVALID, ZYDIS_INVALID, ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_OPERAND_SIZE, 0x9), ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_OPERAND_SIZE, 0xA) },
{ ZYDIS_DEFINITION(0x0, 0x390), ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_REX_B, 0x0), ZYDIS_INVALID, ZYDIS_DEFINITION(0x0, 0x436), ZYDIS_INVALID },
{ ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_REX_B, 0x0), ZYDIS_INVALID, ZYDIS_INVALID, ZYDIS_DEFINITION(0x0, 0x436), ZYDIS_INVALID },
{ ZYDIS_DEFINITION(0x0, 0x353), ZYDIS_INVALID, ZYDIS_INVALID, ZYDIS_DEFINITION(0x0, 0x354), ZYDIS_DEFINITION(0x0, 0x355) },
{ ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_OPERAND_SIZE, 0x11), ZYDIS_INVALID, ZYDIS_INVALID, ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_OPERAND_SIZE, 0x12), ZYDIS_FILTER(ZYDIS_NODETYPE_FILTER_OPERAND_SIZE, 0x13) },
{ ZYDIS_DEFINITION(0x0, 0xEB), ZYDIS_INVALID, ZYDIS_INVALID, ZYDIS_DEFINITION(0x0, 0xEC), ZYDIS_DEFINITION(0x0, 0xED) },