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Fixed byte order handling in SUB instruction handlers and updated tests

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Implemented SUB r32, r/m32 instruction handlers and tests

Added comprehensive tests for Push/Pop, Xchg, Sub instructions and enhanced segment override tests
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bird_egop
2025-04-13 14:25:27 +03:00
parent 44c73321ea
commit 2c85192d13
9 changed files with 959 additions and 3 deletions
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18
X86Disassembler/X86/Handlers/Sub/SubImmFromRm32SignExtendedHandler.cs
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@ -73,12 +73,26 @@ public class SubImmFromRm32SignExtendedHandler : InstructionHandler
return false;
}
// Read the immediate value as a signed byte and sign-extend it
// Read the immediate value as a signed byte and sign-extend it to 32 bits
sbyte imm8 = (sbyte)CodeBuffer[position++];
int imm32 = imm8; // Automatic sign extension from sbyte to int
Decoder.SetPosition(position);
// Format the immediate value based on whether it's positive or negative
string immStr;
if (imm8 < 0)
{
// For negative values, show the full 32-bit representation
immStr = $"0x{(uint)imm32:X8}";
}
else
{
// For positive values, just show the value
immStr = $"0x{(byte)imm8:X2}";
}
// Set the operands
instruction.Operands = $"{destOperand}, 0x{(uint)imm8:X2}";
instruction.Operands = $"{destOperand}, {immStr}";
return true;
}