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zydis
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Fixed decoding of MASK register

This commit is contained in:
flobernd 2017-06-29 21:07:08 +02:00
parent 1fe1894362
commit c2a531902c
1 changed files with 8 additions and 2 deletions
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10
src/Decoder.c
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@ -905,7 +905,7 @@ static uint8_t ZydisCalcRegisterId(ZydisDecoderContext* context, ZydisInstructio
case ZYDIS_REG_ENCODING_REG: case ZYDIS_REG_ENCODING_REG:
{ {
ZYDIS_ASSERT(info->details.modrm.isDecoded); ZYDIS_ASSERT(info->details.modrm.isDecoded);
uint8_t value = info->details.modrm.reg | (context->cache.R << 3); uint8_t value = info->details.modrm.reg;
// R' only exists for EVEX and MVEX. No encoding check needed // R' only exists for EVEX and MVEX. No encoding check needed
switch (registerClass) switch (registerClass)
{ {
@ -914,7 +914,10 @@ static uint8_t ZydisCalcRegisterId(ZydisDecoderContext* context, ZydisInstructio
case ZYDIS_REGCLASS_ZMM: case ZYDIS_REGCLASS_ZMM:
value |= (context->cache.R2 << 4); value |= (context->cache.R2 << 4);
break; break;
case ZYDIS_REGCLASS_MASK:
break;
default: default:
value |= (context->cache.R << 3);
break; break;
} }
return value; return value;
@ -935,7 +938,7 @@ static uint8_t ZydisCalcRegisterId(ZydisDecoderContext* context, ZydisInstructio
case ZYDIS_REG_ENCODING_RM: case ZYDIS_REG_ENCODING_RM:
{ {
ZYDIS_ASSERT(info->details.modrm.isDecoded); ZYDIS_ASSERT(info->details.modrm.isDecoded);
uint8_t value = info->details.modrm.rm | (context->cache.B << 3); uint8_t value = info->details.modrm.rm;
// We have to check the instruction-encoding, because the extension by X is only valid // We have to check the instruction-encoding, because the extension by X is only valid
// for EVEX and MVEX instructions // for EVEX and MVEX instructions
if ((info->encoding == ZYDIS_INSTRUCTION_ENCODING_EVEX) || if ((info->encoding == ZYDIS_INSTRUCTION_ENCODING_EVEX) ||
@ -948,7 +951,10 @@ static uint8_t ZydisCalcRegisterId(ZydisDecoderContext* context, ZydisInstructio
case ZYDIS_REGCLASS_ZMM: case ZYDIS_REGCLASS_ZMM:
value |= (context->cache.X << 4); value |= (context->cache.X << 4);
break; break;
case ZYDIS_REGCLASS_MASK:
break;
default: default:
value |= (context->cache.B << 3);
break; break;
} }
} }