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Fixed several instruction handling issues: 1) Added proper handling for zero displacements in memory operands, 2) Fixed large unsigned displacement values display, 3) Added CmpEaxImmHandler for CMP EAX, imm32 instruction, 4) Fixed JP and JNP conditional jump instruction types

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bird_egop
2025-04-16 19:43:03 +03:00
parent 193f9cd2d8
commit db96af74ff
13 changed files with 271 additions and 47 deletions
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14
X86Disassembler/X86/ModRMDecoder.cs
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@ -102,13 +102,7 @@ public class ModRMDecoder
{
sbyte disp8 = (sbyte)_decoder.ReadByte();
// For EBP (BP), always create a displacement memory operand, even if displacement is 0
// This is because [EBP] with no displacement is encoded as [EBP+0]
if (disp8 == 0 && rmIndex != RegisterIndex.Bp)
{
return OperandFactory.CreateBaseRegisterMemoryOperand(rmIndex, operandSize);
}
// Always create a displacement memory operand for mod=1, even if displacement is 0
return OperandFactory.CreateDisplacementMemoryOperand(rmIndex, disp8, operandSize);
}
@ -140,7 +134,8 @@ public class ModRMDecoder
// This is because [EBP] with no displacement is encoded as [EBP+disp]
if (rmIndex == RegisterIndex.Bp)
{
return OperandFactory.CreateDisplacementMemoryOperand(rmIndex, (int)disp32, operandSize);
// Cast to long to preserve the unsigned value for large displacements
return OperandFactory.CreateDisplacementMemoryOperand(rmIndex, (long)disp32, operandSize);
}
// Only show displacement if it's not zero
@ -149,7 +144,8 @@ public class ModRMDecoder
return OperandFactory.CreateBaseRegisterMemoryOperand(rmIndex, operandSize);
}
return OperandFactory.CreateDisplacementMemoryOperand(rmIndex, (int)disp32, operandSize);
// Cast to long to preserve the unsigned value for large displacements
return OperandFactory.CreateDisplacementMemoryOperand(rmIndex, (long)disp32, operandSize);
}
// Fallback for incomplete data