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Code Issues Releases Activity

Fixed immediate value formatting in Group1 instruction handlers

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bird_egop
2025-04-13 16:00:46 +03:00
parent 2c85192d13
commit 565158d9bd
65 changed files with 1318 additions and 254 deletions
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51
X86DisassemblerTests/InstructionTests/SbbInstructionTests.cs Normal file
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using X86Disassembler.X86;
namespace X86DisassemblerTests.InstructionTests;
/// <summary>
/// Tests for SBB (Subtract with Borrow) instruction handlers
/// </summary>
public class SbbInstructionTests
{
/// <summary>
/// Tests the SbbImmFromRm32Handler for decoding SBB r/m32, imm32 instruction
/// </summary>
[Fact]
public void SbbImmFromRm32Handler_DecodesSbbRm32Imm32_Correctly()
{
// Arrange
// SBB EAX, 0x12345678 (81 D8 78 56 34 12) - ModR/M byte D8 = 11 011 000 (mod=3, reg=3, rm=0)
// mod=3 means direct register addressing, reg=3 is the SBB opcode extension, rm=0 is EAX
byte[] codeBuffer = new byte[] { 0x81, 0xD8, 0x78, 0x56, 0x34, 0x12 };
var decoder = new InstructionDecoder(codeBuffer, codeBuffer.Length);
// Act
var instruction = decoder.DecodeInstruction();
// Assert
Assert.NotNull(instruction);
Assert.Equal("sbb", instruction.Mnemonic);
Assert.Equal("eax, 0x12345678", instruction.Operands);
}
/// <summary>
/// Tests the SbbImmFromRm32SignExtendedHandler for decoding SBB r/m32, imm8 instruction
/// </summary>
[Fact]
public void SbbImmFromRm32SignExtendedHandler_DecodesSbbRm32Imm8_Correctly()
{
// Arrange
// SBB EAX, 0x42 (83 D8 42) - ModR/M byte D8 = 11 011 000 (mod=3, reg=3, rm=0)
// mod=3 means direct register addressing, reg=3 is the SBB opcode extension, rm=0 is EAX
byte[] codeBuffer = new byte[] { 0x83, 0xD8, 0x42 };
var decoder = new InstructionDecoder(codeBuffer, codeBuffer.Length);
// Act
var instruction = decoder.DecodeInstruction();
// Assert
Assert.NotNull(instruction);
Assert.Equal("sbb", instruction.Mnemonic);
Assert.Equal("eax, 0x00000042", instruction.Operands);
}
}