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Code Issues Releases Activity

Fixed instruction handlers and tests for Group1, Group3, and XOR instructions

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This commit is contained in:
bird_egop
2025-04-12 21:48:41 +03:00
parent f107b8e763
commit a0e40c8a52
6 changed files with 79 additions and 24 deletions
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29
X86Disassembler/X86/Handlers/Group3/NotRm32Handler.cs
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@ -23,6 +23,7 @@ public class NotRm32Handler : Group3BaseHandler
/// <returns>True if this handler can decode the opcode</returns>
public override bool CanHandle(byte opcode)
{
// This handler only handles opcode 0xF7
if (opcode != 0xF7)
return false;
@ -45,9 +46,6 @@ public class NotRm32Handler : Group3BaseHandler
/// <returns>True if the instruction was successfully decoded</returns>
public override bool Decode(byte opcode, Instruction instruction)
{
// Set the mnemonic
instruction.Mnemonic = "not";
int position = Decoder.GetPosition();
if (position >= Length)
@ -57,15 +55,34 @@ public class NotRm32Handler : Group3BaseHandler
// Read the ModR/M byte
byte modRM = CodeBuffer[position++];
Decoder.SetPosition(position);
// Extract the fields from the ModR/M byte
byte mod = (byte)((modRM & 0xC0) >> 6);
byte reg = (byte)((modRM & 0x38) >> 3); // Should be 2 for NOT
byte rm = (byte)(modRM & 0x07);
// Decode the operand
string operand = _modRMDecoder.DecodeModRM(mod, rm, false);
// Verify this is a NOT instruction
if (reg != 2)
{
return false;
}
// Set the mnemonic
instruction.Mnemonic = "not";
Decoder.SetPosition(position);
// For direct register addressing (mod == 3), the r/m field specifies a register
string operand;
if (mod == 3)
{
operand = GetRegister32(rm);
}
else
{
// Use the ModR/M decoder for memory addressing
operand = _modRMDecoder.DecodeModRM(mod, rm, false);
}
// Set the operands
instruction.Operands = operand;