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Added CmpRm32R32Handler for CMP r/m32, r32 instruction (0x39) with tests

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bird_egop
2025-04-13 01:34:56 +03:00
parent 28ba47bfab
commit 52841237c1
3 changed files with 222 additions and 0 deletions
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42
X86DisassemblerTests/CmpInstructionHandlerTests.cs
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@ -51,4 +51,46 @@ public class CmpInstructionHandlerTests
Assert.Equal("cmp", instruction.Mnemonic);
Assert.Equal("al, 0xFF", instruction.Operands);
}
/// <summary>
/// Tests the CmpRm32R32Handler for decoding CMP r/m32, r32 instructions with register operands
/// </summary>
[Fact]
public void CmpRm32R32Handler_DecodesCmpRm32R32_WithRegisterOperands()
{
// Arrange
// CMP ECX, EAX (39 C1) - ModR/M byte C1 = 11 000 001 (mod=3, reg=0, rm=1)
// mod=3 means direct register addressing, reg=0 is EAX, rm=1 is ECX
byte[] codeBuffer = new byte[] { 0x39, 0xC1 };
var decoder = new InstructionDecoder(codeBuffer, codeBuffer.Length);
// Act
var instruction = decoder.DecodeInstruction();
// Assert
Assert.NotNull(instruction);
Assert.Equal("cmp", instruction.Mnemonic);
Assert.Equal("ecx, eax", instruction.Operands);
}
/// <summary>
/// Tests the CmpRm32R32Handler for decoding CMP r/m32, r32 instructions with memory operands
/// </summary>
[Fact]
public void CmpRm32R32Handler_DecodesCmpRm32R32_WithMemoryOperands()
{
// Arrange
// CMP [EBX+0x10], EDX (39 53 10) - ModR/M byte 53 = 01 010 011 (mod=1, reg=2, rm=3)
// mod=1 means memory addressing with 8-bit displacement, reg=2 is EDX, rm=3 is EBX
byte[] codeBuffer = new byte[] { 0x39, 0x53, 0x10 };
var decoder = new InstructionDecoder(codeBuffer, codeBuffer.Length);
// Act
var instruction = decoder.DecodeInstruction();
// Assert
Assert.NotNull(instruction);
Assert.Equal("cmp", instruction.Mnemonic);
Assert.Equal("[ebx+0x10], edx", instruction.Operands);
}
}