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Arithmetic overflow checks

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This commit is contained in:
Brian Fiete 2022-01-11 08:17:09 -05:00
parent 1f0d2dcc82
commit eb375362a1
29 changed files with 503 additions and 87 deletions
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44
IDEHelper/X64.cpp
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@ -985,7 +985,7 @@ String X64CPU::InstructionToString(X64Instr* inst, uint64 addr)
return result;
}
bool X64CPU::IsObjectAccessBreak(uint64 address, DbgModuleMemoryCache* memoryCache, int64* regs, int64* outObjectPtr)
DbgBreakKind X64CPU::GetDbgBreakKind(uint64 address, DbgModuleMemoryCache* memoryCache, int64* regs, int64* outObjectPtr)
{
// We've looking for a CMP BYTE PTR [<reg>], -0x80
// if <reg> is R12 then encoding takes an extra 2 bytes
@ -1005,6 +1005,19 @@ bool X64CPU::IsObjectAccessBreak(uint64 address, DbgModuleMemoryCache* memoryCac
continue;
auto immediateType = (instDesc.TSFlags & llvm::X86II::ImmMask);
if ((immediateType == llvm::X86II::Imm8) && (inst.mMCInst.getNumOperands() == 2))
{
// We're checking for a TEST [<reg>], 1
if (inst.mMCInst.getOpcode() != llvm::X86::TEST8ri)
continue;
auto immOp = inst.mMCInst.getOperand(1);
if (!immOp.isImm())
continue;
if (immOp.getImm() != 1)
continue;
return DbgBreakKind_ArithmeticOverflow;
}
if ((immediateType == 0) || (inst.mMCInst.getNumOperands() < 6))
continue;
@ -1027,10 +1040,35 @@ bool X64CPU::IsObjectAccessBreak(uint64 address, DbgModuleMemoryCache* memoryCac
*outObjectPtr = (uint64)regs[regNum];
return true;
return DbgBreakKind_ObjectAccess;
}
return false;
// check jno/jnb
for (int offset = 3; offset <= 3; offset++)
{
if (!Decode(address - offset, memoryCache, &inst))
continue;
if (inst.GetLength() != 2)
continue;
const MCInstrDesc &instDesc = mInstrInfo->get(inst.mMCInst.getOpcode());
if (!instDesc.isBranch())
continue;
auto immediateType = (instDesc.TSFlags & llvm::X86II::ImmMask);
if ((immediateType == llvm::X86II::Imm8PCRel) && (inst.mMCInst.getNumOperands() == 2))
{
auto immOp = inst.mMCInst.getOperand(1);
if (!immOp.isImm())
continue;
if ((immOp.getImm() != 1) && (immOp.getImm() != 3))
continue;
return DbgBreakKind_ArithmeticOverflow;
}
}
return DbgBreakKind_None;
}
int X64CPU::GetOpcodesForMnemonic(const StringImpl& mnemonic, Array<int>& outOpcodes)