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Code Issues Releases Activity

Removed obsolete Group1Handler and Group3Handler classes

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bird_egop 2025-04-12 20:14:28 +03:00
parent e4b8645da0
commit 1442fd7060
2 changed files with 0 additions and 203 deletions
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104
X86Disassembler/X86/Handlers/Group1Handler.cs
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@ -1,104 +0,0 @@
namespace X86Disassembler.X86.Handlers;
/// <summary>
/// Handler for Group 1 instructions (ADD, OR, ADC, SBB, AND, SUB, XOR, CMP)
/// </summary>
public class Group1Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the Group1Handler class
/// </summary>
/// <param name="codeBuffer">The buffer containing the code to decode</param>
/// <param name="decoder">The instruction decoder that owns this handler</param>
/// <param name="length">The length of the buffer</param>
public Group1Handler(byte[] codeBuffer, InstructionDecoder decoder, int length)
: base(codeBuffer, decoder, length)
{
}
/// <summary>
/// Checks if this handler can decode the given opcode
/// </summary>
/// <param name="opcode">The opcode to check</param>
/// <returns>True if this handler can decode the opcode</returns>
public override bool CanHandle(byte opcode)
{
return opcode == 0x80 || opcode == 0x81 || opcode == 0x83;
}
/// <summary>
/// Decodes a Group 1 instruction
/// </summary>
/// <param name="opcode">The opcode of the instruction</param>
/// <param name="instruction">The instruction object to populate</param>
/// <returns>True if the instruction was successfully decoded</returns>
public override bool Decode(byte opcode, Instruction instruction)
{
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// Read the ModR/M byte
var (mod, reg, rm, destOperand) = ModRMDecoder.ReadModRM();
// Determine the operation based on reg field
instruction.Mnemonic = OpcodeMap.Group1Operations[reg];
// Read the immediate value based on opcode
string immOperand;
position = Decoder.GetPosition();
switch (opcode)
{
case 0x80: // 8-bit immediate
if (position < Length)
{
byte imm8 = CodeBuffer[position];
Decoder.SetPosition(position + 1);
immOperand = $"0x{imm8:X2}";
}
else
{
immOperand = "???";
}
break;
case 0x81: // 32-bit immediate
if (position + 4 <= Length)
{
uint imm32 = BitConverter.ToUInt32(CodeBuffer, position);
Decoder.SetPosition(position + 4);
immOperand = $"0x{imm32:X8}";
}
else
{
immOperand = "???";
}
break;
case 0x83: // 8-bit sign-extended immediate
if (position < Length)
{
sbyte imm8 = (sbyte)CodeBuffer[position];
Decoder.SetPosition(position + 1);
immOperand = $"0x{imm8:X2}";
}
else
{
immOperand = "???";
}
break;
default:
return false;
}
// Set the operands
instruction.Operands = $"{destOperand}, {immOperand}";
return true;
}
}

99
X86Disassembler/X86/Handlers/Group3Handler.cs
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@ -1,99 +0,0 @@
namespace X86Disassembler.X86.Handlers;
/// <summary>
/// Handler for Group 3 instructions (TEST, NOT, NEG, MUL, IMUL, DIV, IDIV)
/// </summary>
public class Group3Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the Group3Handler class
/// </summary>
/// <param name="codeBuffer">The buffer containing the code to decode</param>
/// <param name="decoder">The instruction decoder that owns this handler</param>
/// <param name="length">The length of the buffer</param>
public Group3Handler(byte[] codeBuffer, InstructionDecoder decoder, int length)
: base(codeBuffer, decoder, length)
{
}
/// <summary>
/// Checks if this handler can decode the given opcode
/// </summary>
/// <param name="opcode">The opcode to check</param>
/// <returns>True if this handler can decode the opcode</returns>
public override bool CanHandle(byte opcode)
{
return OpcodeMap.IsGroup3Opcode(opcode);
}
/// <summary>
/// Decodes a Group 3 instruction
/// </summary>
/// <param name="opcode">The opcode of the instruction</param>
/// <param name="instruction">The instruction object to populate</param>
/// <returns>True if the instruction was successfully decoded</returns>
public override bool Decode(byte opcode, Instruction instruction)
{
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// Read the ModR/M byte
var (mod, reg, rm, destOperand) = ModRMDecoder.ReadModRM();
// Determine the operation based on reg field
instruction.Mnemonic = OpcodeMap.Group3Operations[reg];
// For TEST instruction (reg = 0), we need to read an immediate value
if (reg == 0) // TEST
{
position = Decoder.GetPosition();
string immOperand;
switch (opcode)
{
case 0xF6: // 8-bit TEST
if (position < Length)
{
byte imm8 = CodeBuffer[position];
Decoder.SetPosition(position + 1);
immOperand = $"0x{imm8:X2}";
}
else
{
immOperand = "???";
}
break;
case 0xF7: // 32-bit TEST
if (position + 3 < Length)
{
uint imm32 = BitConverter.ToUInt32(CodeBuffer, position);
Decoder.SetPosition(position + 4);
immOperand = $"0x{imm32:X8}";
}
else
{
immOperand = "???";
}
break;
default:
return false;
}
// Set the operands
instruction.Operands = $"{destOperand}, {immOperand}";
}
else
{
// For other Group 3 instructions (NOT, NEG, MUL, etc.), there's only one operand
instruction.Operands = destOperand;
}
return true;
}
}