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Fixed TEST instruction handlers and tests. Updated TestImmWithRm8Handler and TestImmWithRm32Handler to properly check opcode in CanHandle and validate reg field in Decode. Improved test cases to use InstructionDecoder directly.

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bird_egop
2025-04-12 21:21:03 +03:00
parent bf5fcdd2ff
commit fe0b04f5a1
10 changed files with 330 additions and 74 deletions
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32
X86Disassembler/X86/Handlers/TestRegMem8Handler.cs
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@@ -57,14 +57,30 @@ public class TestRegMem8Handler : InstructionHandler
byte reg = (byte)((modRM & 0x38) >> 3);
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = _modRMDecoder.DecodeModRM(mod, rm, true);
// Get the source register
string srcReg = GetRegister8(reg);
// Set the operands
instruction.Operands = $"{destOperand}, {srcReg}";
// For direct register addressing (mod == 3), the r/m field specifies a register
if (mod == 3)
{
// Get the register names
string rmReg = GetRegister8(rm);
string regReg = GetRegister8(reg);
// Set the operands (TEST r/m8, r8)
// In x86 assembly, the TEST instruction has the operand order r/m8, r8
// According to Ghidra and standard x86 assembly convention, it should be TEST CL,AL
// where CL is the r/m operand and AL is the reg operand
instruction.Operands = $"{rmReg}, {regReg}";
}
else
{
// Decode the memory operand
string memOperand = _modRMDecoder.DecodeModRM(mod, rm, true);
// Get the register name
string regReg = GetRegister8(reg);
// Set the operands (TEST r/m8, r8)
instruction.Operands = $"{memOperand}, {regReg}";
}
return true;
}