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zydis
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Minor changes to the operand formatter hooks 

`ZYDIS_FORMATTER_HOOK_PRE_OPERAND` and `ZYDIS_FORMATTER_HOOK_POST_OPERAND` can be used to omit a specific operand, if you return a status-code different to `ZYDIS_STATUS_SUCCESS`.
This commit is contained in:
flobernd 2018-02-05 23:49:50 +01:00
parent ca9898fa42
commit 4e189721b2
No known key found for this signature in database
GPG Key ID: 9C3AE0ED4A969F10
1 changed files with 20 additions and 9 deletions
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29
src/Formatter.c
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@ -88,13 +88,16 @@ static ZydisStatus ZydisFormatInstrIntel(const ZydisFormatter* formatter, ZydisS
ZYDIS_CHECK(ZydisStringAppendC(string, ", ")); ZYDIS_CHECK(ZydisStringAppendC(string, ", "));
} }
const ZydisUSize strLenPreOperand = string->length;
if (formatter->funcPreOperand) if (formatter->funcPreOperand)
{ {
formatter->funcPreOperand(formatter, string, instruction, &instruction->operands[i], if (!ZYDIS_SUCCESS(formatter->funcPreOperand(formatter, string, instruction,
userData); &instruction->operands[i], userData)))
{
goto SkipOperand;
}
} }
const ZydisUSize strLenPreOperand = string->length;
switch (instruction->operands[i].type) switch (instruction->operands[i].type)
{ {
case ZYDIS_OPERAND_TYPE_REGISTER: case ZYDIS_OPERAND_TYPE_REGISTER:
@ -126,8 +129,18 @@ static ZydisStatus ZydisFormatInstrIntel(const ZydisFormatter* formatter, ZydisS
return ZYDIS_STATUS_INVALID_PARAMETER; return ZYDIS_STATUS_INVALID_PARAMETER;
} }
if (formatter->funcPostOperand)
{
if (!ZYDIS_SUCCESS(formatter->funcPostOperand(formatter, string, instruction,
&instruction->operands[i], userData)))
{
goto SkipOperand;
}
}
if (strLenPreOperand == string->length) if (strLenPreOperand == string->length)
{ {
SkipOperand:
// Omit whole operand, if the string did not change during the formatting-callback // Omit whole operand, if the string did not change during the formatting-callback
string->length = strLenRestore; string->length = strLenRestore;
@ -140,12 +153,6 @@ static ZydisStatus ZydisFormatInstrIntel(const ZydisFormatter* formatter, ZydisS
continue; continue;
} }
if (formatter->funcPostOperand)
{
formatter->funcPostOperand(formatter, string, instruction, &instruction->operands[i],
userData);
}
if ((instruction->encoding == ZYDIS_INSTRUCTION_ENCODING_EVEX) || if ((instruction->encoding == ZYDIS_INSTRUCTION_ENCODING_EVEX) ||
(instruction->encoding == ZYDIS_INSTRUCTION_ENCODING_MVEX)) (instruction->encoding == ZYDIS_INSTRUCTION_ENCODING_MVEX))
{ {
@ -902,6 +909,10 @@ ZydisStatus ZydisFormatterInit(ZydisFormatter* formatter, ZydisFormatterStyle st
switch (style) switch (style)
{ {
case ZYDIS_FORMATTER_STYLE_INTEL: case ZYDIS_FORMATTER_STYLE_INTEL:
formatter->funcPreInstruction = ZYDIS_NULL;
formatter->funcPostInstruction = ZYDIS_NULL;
formatter->funcPreOperand = ZYDIS_NULL;
formatter->funcPostOperand = ZYDIS_NULL;
formatter->funcFormatInstruction = &ZydisFormatInstrIntel; formatter->funcFormatInstruction = &ZydisFormatInstrIntel;
formatter->funcFormatOperandReg = &ZydisFormatOperandRegIntel; formatter->funcFormatOperandReg = &ZydisFormatOperandRegIntel;
formatter->funcFormatOperandMem = &ZydisFormatOperandMemIntel; formatter->funcFormatOperandMem = &ZydisFormatOperandMemIntel;