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GleeBug
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Add more elaborate IsRepeated check in StepOver

This commit is contained in:
Duncan Ogilvie 2023-07-08 13:01:20 +02:00
parent 9676c960b6
commit 6c253bc74d
1 changed files with 22 additions and 2 deletions
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24
GleeBug/Debugger.Process.cpp
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@ -21,6 +21,26 @@ namespace GleeBug
hardwareBreakpoints[i].internal.hardware.enabled = false; hardwareBreakpoints[i].internal.hardware.enabled = false;
} }
static bool IsRepeated(const ZydisInstructionInfo & info)
{
// https://www.felixcloutier.com/x86/rep:repe:repz:repne:repnz
// TODO: allow extracting the affected range
switch(info.mnemonic)
{
case ZYDIS_MNEMONIC_INS:
case ZYDIS_MNEMONIC_OUTS:
case ZYDIS_MNEMONIC_MOVS:
case ZYDIS_MNEMONIC_MOVSD:
case ZYDIS_MNEMONIC_LODS:
case ZYDIS_MNEMONIC_STOS:
case ZYDIS_MNEMONIC_CMPS:
case ZYDIS_MNEMONIC_CMPSD:
case ZYDIS_MNEMONIC_SCAS:
return (info.attributes & (ZYDIS_ATTRIB_HAS_REP | ZYDIS_ATTRIB_HAS_REPZ | ZYDIS_ATTRIB_HAS_REPNZ)) != 0;
}
return false;
}
void Process::StepOver(const StepCallback & cbStep) void Process::StepOver(const StepCallback & cbStep)
{ {
auto gip = Registers(thread->hThread, CONTEXT_CONTROL).Gip(); auto gip = Registers(thread->hThread, CONTEXT_CONTROL).Gip();
@ -43,8 +63,8 @@ namespace GleeBug
stepOver = true; stepOver = true;
break; break;
default: default:
auto repAttributes = ZYDIS_ATTRIB_HAS_REP | ZYDIS_ATTRIB_HAS_REPE | ZYDIS_ATTRIB_HAS_REPZ | ZYDIS_ATTRIB_HAS_REPNE | ZYDIS_ATTRIB_HAS_REPNZ; stepOver = IsRepeated(info);
stepOver = (info.attributes & repAttributes) != 0; break;
} }
} }
if(stepOver) if(stepOver)