mirrors/ParkanPlayground
0
Fork 0
mirror of https://github.com/sampletext32/ParkanPlayground.git synced 2025-06-20 16:18:37 +03:00
Code Issues Releases Activity

move handlers

Browse Source
This commit is contained in:
bird_egop
2025-04-12 21:34:16 +03:00
parent a6b6cc1149
commit 794b56c6b5
8 changed files with 24 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

94
X86Disassembler/X86/Handlers/Group3/TestImmWithRm32Handler.cs
View File

@ -1,94 +0,0 @@
namespace X86Disassembler.X86.Handlers.Group3;
/// <summary>
/// Handler for TEST r/m32, imm32 instruction (0xF7 /0)
/// </summary>
public class TestImmWithRm32Handler : Group3BaseHandler
{
/// <summary>
/// Initializes a new instance of the TestImmWithRm32Handler 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 TestImmWithRm32Handler(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
// The reg field check (for TEST operation) will be done in the Decode method
return opcode == 0xF7;
}
/// <summary>
/// Decodes a TEST 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)
{
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 TEST
byte rm = (byte)(modRM & 0x07);
// Check if the reg field is 0 (TEST operation)
if (reg != 0)
{
return false; // Not a TEST instruction
}
// Set the mnemonic
instruction.Mnemonic = "test";
Decoder.SetPosition(position);
// Get the operand based on the addressing mode
string destOperand;
// For direct register addressing (mod == 3), the r/m field specifies a register
if (mod == 3)
{
destOperand = GetRegister32(rm);
}
else
{
// Use the ModR/M decoder for memory addressing
destOperand = _modRMDecoder.DecodeModRM(mod, rm, false);
}
// Read the immediate value
if (position + 3 >= Length)
{
return false;
}
// Read the immediate value using BitConverter
uint imm32 = BitConverter.ToUInt32(CodeBuffer, position);
Decoder.SetPosition(position + 4);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}

93
X86Disassembler/X86/Handlers/Group3/TestImmWithRm8Handler.cs
View File

@ -1,93 +0,0 @@
namespace X86Disassembler.X86.Handlers.Group3;
/// <summary>
/// Handler for TEST r/m8, imm8 instruction (0xF6 /0)
/// </summary>
public class TestImmWithRm8Handler : Group3BaseHandler
{
/// <summary>
/// Initializes a new instance of the TestImmWithRm8Handler 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 TestImmWithRm8Handler(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 0xF6
// The reg field check (for TEST operation) will be done in the Decode method
return opcode == 0xF6;
}
/// <summary>
/// Decodes a TEST 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)
{
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 TEST
byte rm = (byte)(modRM & 0x07);
// Check if the reg field is 0 (TEST operation)
if (reg != 0)
{
return false; // Not a TEST instruction
}
// Set the mnemonic
instruction.Mnemonic = "test";
Decoder.SetPosition(position);
// Get the operand based on the addressing mode
string destOperand;
// For direct register addressing (mod == 3), the r/m field specifies a register
if (mod == 3)
{
destOperand = GetRegister8(rm);
}
else
{
// Use the ModR/M decoder for memory addressing
destOperand = _modRMDecoder.DecodeModRM(mod, rm, true);
}
// Read the immediate value
if (position >= Length)
{
return false;
}
byte imm8 = CodeBuffer[position];
Decoder.SetPosition(position + 1);
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm8:X2}";
return true;
}
}