mirrors/ParkanPlayground
0
Fork 0
mirror of https://github.com/sampletext32/ParkanPlayground.git synced 2025-06-20 00:18:02 +03:00
Code Issues Releases Activity

nice big refactor

Browse Source
This commit is contained in:
bird_egop
2025-04-13 23:06:52 +03:00
parent 59df064ca4
commit 11a2cfada4
92 changed files with 981 additions and 1509 deletions
Download Patch File Download Diff File Expand all files Collapse all files

54
X86Disassembler/X86/Handlers/Sbb/SbbImmFromRm32Handler.cs
View File

@ -11,11 +11,11 @@ public class SbbImmFromRm32Handler : InstructionHandler
/// <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)
public SbbImmFromRm32Handler(byte[] codeBuffer, InstructionDecoder decoder, int length)
: base(codeBuffer, decoder, length)
{
}
/// <summary>
/// Checks if this handler can decode the given opcode
/// </summary>
@ -25,18 +25,18 @@ public class SbbImmFromRm32Handler : InstructionHandler
{
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);
byte reg = (byte) ((modRM & 0x38) >> 3);
return reg == 3; // 3 = SBB
}
/// <summary>
/// Decodes a SBB r/m32, imm32 instruction
/// </summary>
@ -47,49 +47,33 @@ public class SbbImmFromRm32Handler : InstructionHandler
{
// 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);
var (mod, reg, rm, destOperand) = ModRMDecoder.ReadModRM();
// Read the immediate value
if (position + 3 >= Length)
{
return false;
}
// Read the immediate value in little-endian format
byte b0 = CodeBuffer[position];
byte b1 = CodeBuffer[position + 1];
byte b2 = CodeBuffer[position + 2];
byte b3 = CodeBuffer[position + 3];
var imm32 = Decoder.ReadUInt32();
// Format the immediate value as expected by the tests (0x12345678)
// Note: The bytes are reversed to match the expected format in the tests
string immStr = $"0x{b3:X2}{b2:X2}{b1:X2}{b0:X2}";
// Advance the position past the immediate value
position += 4;
Decoder.SetPosition(position);
string immStr = $"0x{imm32:X8}";
// Set the operands
instruction.Operands = $"{destOperand}, {immStr}";
return true;
}
}
}

46
X86Disassembler/X86/Handlers/Sbb/SbbImmFromRm32SignExtendedHandler.cs
View File

@ -11,11 +11,11 @@ public class SbbImmFromRm32SignExtendedHandler : InstructionHandler
/// <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)
public SbbImmFromRm32SignExtendedHandler(byte[] codeBuffer, InstructionDecoder decoder, int length)
: base(codeBuffer, decoder, length)
{
}
/// <summary>
/// Checks if this handler can decode the given opcode
/// </summary>
@ -25,18 +25,18 @@ public class SbbImmFromRm32SignExtendedHandler : InstructionHandler
{
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);
byte reg = (byte) ((modRM & 0x38) >> 3);
return reg == 3; // 3 = SBB
}
/// <summary>
/// Decodes a SBB r/m32, imm8 (sign-extended) instruction
/// </summary>
@ -47,39 +47,29 @@ public class SbbImmFromRm32SignExtendedHandler : InstructionHandler
{
// 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);
var (mod, reg, rm, destOperand) = ModRMDecoder.ReadModRM();
// 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);
// Sign-extend to 32 bits
int imm32 = (sbyte) Decoder.ReadByte();
// Set the operands
instruction.Operands = $"{destOperand}, 0x{imm32:X8}";
return true;
}
}
}