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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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75
X86Disassembler/X86/Handlers/ArithmeticUnary/DivRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticUnary;
/// <summary>
/// Handler for DIV r/m32 instruction (0xF7 /6)
/// </summary>
public class DivRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the DivRm32Handler 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 DivRm32Handler(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 != 0xF7)
return false;
// Check if the reg field of the ModR/M byte is 6 (DIV)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 6; // 6 = DIV
}
/// <summary>
/// Decodes a DIV r/m32 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 = "div";
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 6 for DIV
byte rm = (byte)(modRM & 0x07);
// Decode the operand
string operand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Set the operands
instruction.Operands = operand;
return true;
}
}

75
X86Disassembler/X86/Handlers/ArithmeticUnary/IdivRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticUnary;
/// <summary>
/// Handler for IDIV r/m32 instruction (0xF7 /7)
/// </summary>
public class IdivRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the IdivRm32Handler 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 IdivRm32Handler(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 != 0xF7)
return false;
// Check if the reg field of the ModR/M byte is 7 (IDIV)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 7; // 7 = IDIV
}
/// <summary>
/// Decodes an IDIV r/m32 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 = "idiv";
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 IDIV
byte rm = (byte)(modRM & 0x07);
// Decode the operand
string operand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Set the operands
instruction.Operands = operand;
return true;
}
}

75
X86Disassembler/X86/Handlers/ArithmeticUnary/ImulRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticUnary;
/// <summary>
/// Handler for IMUL r/m32 instruction (0xF7 /5)
/// </summary>
public class ImulRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the ImulRm32Handler 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 ImulRm32Handler(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 != 0xF7)
return false;
// Check if the reg field of the ModR/M byte is 5 (IMUL)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 5; // 5 = IMUL
}
/// <summary>
/// Decodes an IMUL r/m32 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 = "imul";
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 IMUL
byte rm = (byte)(modRM & 0x07);
// Decode the operand
string operand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Set the operands
instruction.Operands = operand;
return true;
}
}

75
X86Disassembler/X86/Handlers/ArithmeticUnary/MulRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticUnary;
/// <summary>
/// Handler for MUL r/m32 instruction (0xF7 /4)
/// </summary>
public class MulRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the MulRm32Handler 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 MulRm32Handler(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 != 0xF7)
return false;
// Check if the reg field of the ModR/M byte is 4 (MUL)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 4; // 4 = MUL
}
/// <summary>
/// Decodes a MUL r/m32 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 = "mul";
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 MUL
byte rm = (byte)(modRM & 0x07);
// Decode the operand
string operand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Set the operands
instruction.Operands = operand;
return true;
}
}

75
X86Disassembler/X86/Handlers/ArithmeticUnary/NegRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticUnary;
/// <summary>
/// Handler for NEG r/m32 instruction (0xF7 /3)
/// </summary>
public class NegRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the NegRm32Handler 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 NegRm32Handler(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 != 0xF7)
return false;
// Check if the reg field of the ModR/M byte is 3 (NEG)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 3; // 3 = NEG
}
/// <summary>
/// Decodes a NEG r/m32 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 = "neg";
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 NEG
byte rm = (byte)(modRM & 0x07);
// Decode the operand
string operand = ModRMDecoder.DecodeModRM(mod, rm, false);
// Set the operands
instruction.Operands = operand;
return true;
}
}

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X86Disassembler/X86/Handlers/ArithmeticUnary/NotRm32Handler.cs Normal file
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namespace X86Disassembler.X86.Handlers.ArithmeticUnary;
/// <summary>
/// Handler for NOT r/m32 instruction (0xF7 /2)
/// </summary>
public class NotRm32Handler : InstructionHandler
{
/// <summary>
/// Initializes a new instance of the NotRm32Handler 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 NotRm32Handler(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)
{
// This handler only handles opcode 0xF7
if (opcode != 0xF7)
return false;
// Check if the reg field of the ModR/M byte is 2 (NOT)
int position = Decoder.GetPosition();
if (position >= Length)
return false;
byte modRM = CodeBuffer[position];
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 2; // 2 = NOT
}
/// <summary>
/// Decodes a NOT r/m32 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
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 2 for NOT
byte rm = (byte)(modRM & 0x07);
// 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;
return true;
}
}