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more refactoring

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bird_egop
2025-04-14 01:08:14 +03:00
parent f54dc10596
commit 99b93523a4
78 changed files with 379 additions and 594 deletions
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44
X86Disassembler/X86/Handlers/And/AndImmToRm32SignExtendedHandler.cs
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@ -11,11 +11,11 @@ public class AndImmToRm32SignExtendedHandler : 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 AndImmToRm32SignExtendedHandler(byte[] codeBuffer, InstructionDecoder decoder, int length)
public AndImmToRm32SignExtendedHandler(byte[] codeBuffer, InstructionDecoder decoder, int length)
: base(codeBuffer, decoder, length)
{
}
/// <summary>
/// Checks if this handler can decode the given opcode
/// </summary>
@ -27,22 +27,22 @@ public class AndImmToRm32SignExtendedHandler : InstructionHandler
{
return false;
}
// Check if we have enough bytes to read the ModR/M byte
int position = Decoder.GetPosition();
if (position >= Length)
if (!Decoder.CanReadByte())
{
return false;
}
// Read the ModR/M byte to check the reg field (bits 5-3)
byte modRM = CodeBuffer[position];
int reg = (modRM >> 3) & 0x7;
// reg = 4 means AND operation
return reg == 4;
}
/// <summary>
/// Decodes an AND r/m32, imm8 (sign-extended) instruction
/// </summary>
@ -53,22 +53,18 @@ public class AndImmToRm32SignExtendedHandler : InstructionHandler
{
// Set the mnemonic
instruction.Mnemonic = "and";
// Read the ModR/M byte
var (mod, reg, rm, memOperand) = ModRMDecoder.ReadModRM();
// Get the position after decoding the ModR/M byte
int position = Decoder.GetPosition();
// Check if we have enough bytes for the immediate value
if (position >= Length)
if (!Decoder.CanReadByte())
{
return false; // Not enough bytes for the immediate value
}
// Read the immediate value as a signed byte and automatically sign-extend it to int
int signExtendedImm = (sbyte)Decoder.ReadByte();
int imm = (sbyte) Decoder.ReadByte();
// Format the destination operand based on addressing mode
string destOperand;
if (mod == 3) // Register addressing mode
@ -81,23 +77,23 @@ public class AndImmToRm32SignExtendedHandler : InstructionHandler
// Memory operand already includes dword ptr prefix
destOperand = memOperand;
}
// Format the immediate value
string immStr;
if (signExtendedImm < 0)
if (imm < 0)
{
// For negative values, use the full 32-bit representation
immStr = $"0x{(uint)signExtendedImm:X8}";
immStr = $"0x{(uint) imm:X8}";
}
else
{
// For positive values, use the regular format with leading zeros
immStr = $"0x{signExtendedImm:X8}";
immStr = $"0x{imm:X8}";
}
// Set the operands
instruction.Operands = $"{destOperand}, {immStr}";
return true;
}
}
}