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Reorganized instruction handlers into more descriptive folders (ArithmeticImmediate and ArithmeticUnary)

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bird_egop
2025-04-12 23:46:05 +03:00
parent f658f4384c
commit 016e1ee54f
26 changed files with 52 additions and 55 deletions
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84
X86Disassembler/X86/Handlers/ArithmeticImmediate/AdcImmToRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for ADC r/m32, imm32 instruction (0x81 /2)
/// </summary>
public class AdcImmToRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the AdcImmToRm32Handler 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 AdcImmToRm32Handler(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)
{
if (opcode != 0x81)
return false;
// Check if the reg field of the ModR/M byte is 2 (ADC)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 2; // 2 = ADC
}
/// <summary>
/// Decodes an ADC r/m32, imm32 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)
{
// Set the mnemonic
instruction.Mnemonic = "adc";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 ADC
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value
if (position + 3 >= Length)
{
return false;
}
uint imm32 = BitConverter.ToUInt32(CodeBuffer, position);
Decoder.SetPosition(position + 4);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

85
X86Disassembler/X86/Handlers/ArithmeticImmediate/AdcImmToRm32SignExtendedHandler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for ADC r/m32, imm8 (sign-extended) instruction (0x83 /2)
/// </summary>
public class AdcImmToRm32SignExtendedHandler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the AdcImmToRm32SignExtendedHandler 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 AdcImmToRm32SignExtendedHandler(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)
{
if (opcode != 0x83)
return false;
// Check if the reg field of the ModR/M byte is 2 (ADC)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 2; // 2 = ADC
}
/// <summary>
/// Decodes an ADC r/m32, imm8 (sign-extended) 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)
{
// Set the mnemonic
instruction.Mnemonic = "adc";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 ADC
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value (sign-extended from 8 to 32 bits)
if (position >= Length)
{
return false;
}
sbyte imm8 = (sbyte)CodeBuffer[position];
int imm32 = imm8; // Sign-extend to 32 bits
Decoder.SetPosition(position + 1);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

84
X86Disassembler/X86/Handlers/ArithmeticImmediate/AddImmToRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for ADD r/m32, imm32 instruction (0x81 /0)
/// </summary>
public class AddImmToRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the AddImmToRm32Handler 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 AddImmToRm32Handler(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)
{
if (opcode != 0x81)
return false;
// Check if the reg field of the ModR/M byte is 0 (ADD)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 0; // 0 = ADD
}
/// <summary>
/// Decodes an ADD r/m32, imm32 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)
{
// Set the mnemonic
instruction.Mnemonic = "add";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 0 for ADD
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value
if (position + 3 >= Length)
{
return false;
}
uint imm32 = BitConverter.ToUInt32(CodeBuffer, position);
Decoder.SetPosition(position + 4);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

85
X86Disassembler/X86/Handlers/ArithmeticImmediate/AddImmToRm32SignExtendedHandler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for ADD r/m32, imm8 (sign-extended) instruction (0x83 /0)
/// </summary>
public class AddImmToRm32SignExtendedHandler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the AddImmToRm32SignExtendedHandler 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 AddImmToRm32SignExtendedHandler(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)
{
if (opcode != 0x83)
return false;
// Check if the reg field of the ModR/M byte is 0 (ADD)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 0; // 0 = ADD
}
/// <summary>
/// Decodes an ADD r/m32, imm8 (sign-extended) 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)
{
// Set the mnemonic
instruction.Mnemonic = "add";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 0 for ADD
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value
if (position >= Length)
{
return false;
}
// Read the immediate value as a signed byte and sign-extend it
sbyte imm8 = (sbyte)CodeBuffer[position++];
Decoder.SetPosition(position);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{(uint)imm8:X2}";
return true;
}
}

95
X86Disassembler/X86/Handlers/ArithmeticImmediate/AddImmToRm8Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for ADD r/m8, imm8 instruction (0x80 /0)
/// </summary>
public class AddImmToRm8Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the AddImmToRm8Handler 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 AddImmToRm8Handler(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)
{
if (opcode != 0x80)
return false;
// Check if the reg field of the ModR/M byte is 0 (ADD)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 0; // 0 = ADD
}
/// <summary>
/// Decodes an ADD r/m8, imm8 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)
{
// Set the mnemonic
instruction.Mnemonic = "add";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// Read the ModR/M byte
byte modRM = CodeBuffer[position++];
// Extract the fields from the ModR/M byte
byte mod = (byte)((modRM & 0xC0) >> 6);
byte reg = (byte)((modRM & 0x38) >> 3); // Should be 0 for ADD
byte rm = (byte)(modRM & 0x07);
// For direct register addressing (mod == 3), use 8-bit register names
string destOperand;
if (mod == 3)
{
// Use 8-bit register names for direct register addressing
destOperand = GetRegister8(rm);
}
else
{
// Use ModR/M decoder for memory addressing
destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
}
Decoder.SetPosition(position);
// Read the immediate value
if (position >= Length)
{
return false;
}
byte imm8 = CodeBuffer[position++];
Decoder.SetPosition(position);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm8:X2}";
return true;
}
}

84
X86Disassembler/X86/Handlers/ArithmeticImmediate/AndImmWithRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for AND r/m32, imm32 instruction (0x81 /4)
/// </summary>
public class AndImmWithRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the AndImmWithRm32Handler 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 AndImmWithRm32Handler(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)
{
if (opcode != 0x81)
return false;
// Check if the reg field of the ModR/M byte is 4 (AND)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 4; // 4 = AND
}
/// <summary>
/// Decodes an AND r/m32, imm32 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)
{
// Set the mnemonic
instruction.Mnemonic = "and";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 4 for AND
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value
if (position + 3 >= Length)
{
return false;
}
uint imm32 = BitConverter.ToUInt32(CodeBuffer, position);
Decoder.SetPosition(position + 4);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

85
X86Disassembler/X86/Handlers/ArithmeticImmediate/AndImmWithRm32SignExtendedHandler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for AND r/m32, imm8 (sign-extended) instruction (0x83 /4)
/// </summary>
public class AndImmWithRm32SignExtendedHandler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the AndImmWithRm32SignExtendedHandler 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 AndImmWithRm32SignExtendedHandler(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)
{
if (opcode != 0x83)
return false;
// Check if the reg field of the ModR/M byte is 4 (AND)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 4; // 4 = AND
}
/// <summary>
/// Decodes an AND r/m32, imm8 (sign-extended) 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)
{
// Set the mnemonic
instruction.Mnemonic = "and";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 4 for AND
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value (sign-extended from 8 to 32 bits)
if (position >= Length)
{
return false;
}
sbyte imm8 = (sbyte)CodeBuffer[position];
int imm32 = imm8; // Sign-extend to 32 bits
Decoder.SetPosition(position + 1);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

84
X86Disassembler/X86/Handlers/ArithmeticImmediate/CmpImmWithRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for CMP r/m32, imm32 instruction (0x81 /7)
/// </summary>
public class CmpImmWithRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the CmpImmWithRm32Handler 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 CmpImmWithRm32Handler(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)
{
if (opcode != 0x81)
return false;
// Check if the reg field of the ModR/M byte is 7 (CMP)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 7; // 7 = CMP
}
/// <summary>
/// Decodes a CMP r/m32, imm32 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)
{
// Set the mnemonic
instruction.Mnemonic = "cmp";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 7 for CMP
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value
if (position + 3 >= Length)
{
return false;
}
uint imm32 = BitConverter.ToUInt32(CodeBuffer, position);
Decoder.SetPosition(position + 4);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

85
X86Disassembler/X86/Handlers/ArithmeticImmediate/CmpImmWithRm32SignExtendedHandler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for CMP r/m32, imm8 (sign-extended) instruction (0x83 /7)
/// </summary>
public class CmpImmWithRm32SignExtendedHandler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the CmpImmWithRm32SignExtendedHandler 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 CmpImmWithRm32SignExtendedHandler(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)
{
if (opcode != 0x83)
return false;
// Check if the reg field of the ModR/M byte is 7 (CMP)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 7; // 7 = CMP
}
/// <summary>
/// Decodes a CMP r/m32, imm8 (sign-extended) 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)
{
// Set the mnemonic
instruction.Mnemonic = "cmp";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 7 for CMP
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value
if (position >= Length)
{
return false;
}
// Read the immediate value as a signed byte and sign-extend it
sbyte imm8 = (sbyte)CodeBuffer[position++];
Decoder.SetPosition(position);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{(uint)imm8:X2}";
return true;
}
}

84
X86Disassembler/X86/Handlers/ArithmeticImmediate/OrImmToRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for OR r/m32, imm32 instruction (0x81 /1)
/// </summary>
public class OrImmToRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the OrImmToRm32Handler 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 OrImmToRm32Handler(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)
{
if (opcode != 0x81)
return false;
// Check if the reg field of the ModR/M byte is 1 (OR)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 1; // 1 = OR
}
/// <summary>
/// Decodes an OR r/m32, imm32 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)
{
// Set the mnemonic
instruction.Mnemonic = "or";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 1 for OR
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value
if (position + 3 >= Length)
{
return false;
}
uint imm32 = BitConverter.ToUInt32(CodeBuffer, position);
Decoder.SetPosition(position + 4);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

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X86Disassembler/X86/Handlers/ArithmeticImmediate/OrImmToRm32SignExtendedHandler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for OR r/m32, imm8 (sign-extended) instruction (0x83 /1)
/// </summary>
public class OrImmToRm32SignExtendedHandler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the OrImmToRm32SignExtendedHandler 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 OrImmToRm32SignExtendedHandler(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)
{
if (opcode != 0x83)
return false;
// Check if the reg field of the ModR/M byte is 1 (OR)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 1; // 1 = OR
}
/// <summary>
/// Decodes an OR r/m32, imm8 (sign-extended) 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)
{
// Set the mnemonic
instruction.Mnemonic = "or";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 1 for OR
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value (sign-extended from 8 to 32 bits)
if (position >= Length)
{
return false;
}
sbyte imm8 = (sbyte)CodeBuffer[position];
int imm32 = imm8; // Sign-extend to 32 bits
Decoder.SetPosition(position + 1);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

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X86Disassembler/X86/Handlers/ArithmeticImmediate/OrImmToRm8Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for OR r/m8, imm8 instruction (0x80 /1)
/// </summary>
public class OrImmToRm8Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the OrImmToRm8Handler 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 OrImmToRm8Handler(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)
{
if (opcode != 0x80)
return false;
// Check if the reg field of the ModR/M byte is 1 (OR)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 1; // 1 = OR
}
/// <summary>
/// Decodes an OR r/m8, imm8 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)
{
// Set the mnemonic
instruction.Mnemonic = "or";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// Read the ModR/M byte
byte modRM = CodeBuffer[position++];
// Extract the fields from the ModR/M byte
byte mod = (byte)((modRM & 0xC0) >> 6);
byte reg = (byte)((modRM & 0x38) >> 3); // Should be 1 for OR
byte rm = (byte)(modRM & 0x07);
// For direct register addressing (mod == 3), use 8-bit register names
string destOperand;
if (mod == 3)
{
// Use 8-bit register names for direct register addressing
destOperand = GetRegister8(rm);
}
else
{
// Use ModR/M decoder for memory addressing
destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
}
Decoder.SetPosition(position);
// Read the immediate value
if (position >= Length)
{
return false;
}
byte imm8 = CodeBuffer[position++];
Decoder.SetPosition(position);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm8:X2}";
return true;
}
}

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X86Disassembler/X86/Handlers/ArithmeticImmediate/SbbImmFromRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for SBB r/m32, imm32 instruction (0x81 /3)
/// </summary>
public class SbbImmFromRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the SbbImmFromRm32Handler 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 SbbImmFromRm32Handler(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)
{
if (opcode != 0x81)
return false;
// Check if the reg field of the ModR/M byte is 3 (SBB)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 3; // 3 = SBB
}
/// <summary>
/// Decodes a SBB r/m32, imm32 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)
{
// Set the mnemonic
instruction.Mnemonic = "sbb";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 3 for SBB
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value
if (position + 3 >= Length)
{
return false;
}
uint imm32 = BitConverter.ToUInt32(CodeBuffer, position);
Decoder.SetPosition(position + 4);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

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X86Disassembler/X86/Handlers/ArithmeticImmediate/SbbImmFromRm32SignExtendedHandler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for SBB r/m32, imm8 (sign-extended) instruction (0x83 /3)
/// </summary>
public class SbbImmFromRm32SignExtendedHandler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the SbbImmFromRm32SignExtendedHandler 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 SbbImmFromRm32SignExtendedHandler(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)
{
if (opcode != 0x83)
return false;
// Check if the reg field of the ModR/M byte is 3 (SBB)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 3; // 3 = SBB
}
/// <summary>
/// Decodes a SBB r/m32, imm8 (sign-extended) 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)
{
// Set the mnemonic
instruction.Mnemonic = "sbb";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 3 for SBB
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value (sign-extended from 8 to 32 bits)
if (position >= Length)
{
return false;
}
sbyte imm8 = (sbyte)CodeBuffer[position];
int imm32 = imm8; // Sign-extend to 32 bits
Decoder.SetPosition(position + 1);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

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X86Disassembler/X86/Handlers/ArithmeticImmediate/SubImmFromRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for SUB r/m32, imm32 instruction (0x81 /5)
/// </summary>
public class SubImmFromRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the SubImmFromRm32Handler 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 SubImmFromRm32Handler(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)
{
if (opcode != 0x81)
return false;
// Check if the reg field of the ModR/M byte is 5 (SUB)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 5; // 5 = SUB
}
/// <summary>
/// Decodes a SUB r/m32, imm32 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)
{
// Set the mnemonic
instruction.Mnemonic = "sub";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 5 for SUB
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value
if (position + 3 >= Length)
{
return false;
}
uint imm32 = BitConverter.ToUInt32(CodeBuffer, position);
Decoder.SetPosition(position + 4);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

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X86Disassembler/X86/Handlers/ArithmeticImmediate/SubImmFromRm32SignExtendedHandler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticImmediate;
/// <summary>
/// Handler for SUB r/m32, imm8 (sign-extended) instruction (0x83 /5)
/// </summary>
public class SubImmFromRm32SignExtendedHandler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the SubImmFromRm32SignExtendedHandler 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 SubImmFromRm32SignExtendedHandler(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)
{
if (opcode != 0x83)
return false;
// Check if the reg field of the ModR/M byte is 5 (SUB)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 5; // 5 = SUB
}
/// <summary>
/// Decodes a SUB r/m32, imm8 (sign-extended) 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)
{
// Set the mnemonic
instruction.Mnemonic = "sub";
int position = Decoder.GetPosition();
if (position >= Length)
{
return false;
}
// 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 5 for SUB
byte rm = (byte)(modRM & 0x07);
// Decode the destination operand
string destOperand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Read the immediate value
if (position >= Length)
{
return false;
}
// Read the immediate value as a signed byte and sign-extend it
sbyte imm8 = (sbyte)CodeBuffer[position++];
Decoder.SetPosition(position);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{(uint)imm8:X2}";
return true;
}
}