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nice big refactor

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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
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45
X86Disassembler/X86/Handlers/Add/AddImmToRm32SignExtendedHandler.cs
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@ -59,24 +59,19 @@ public class AddImmToRm32SignExtendedHandler : InstructionHandler
}
// Read the ModR/M byte
byte modRM = CodeBuffer[startPosition];
// 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);
var (mod, reg, rm, destOperand) = ModRMDecoder.ReadModRM();
// Track the bytes needed for this instruction
int bytesNeeded = 1; // ModR/M byte
// Process SIB byte if needed
byte sib = 0;
if (mod != 3 && rm == 4) // SIB byte present
if (mod != 3 && rm == RegisterIndex.Si) // SIB byte present
{
if (startPosition + bytesNeeded >= Length)
{
instruction.Operands = "??";
instruction.RawBytes = new byte[] { opcode, modRM };
instruction.RawBytes = new byte[] { opcode, CodeBuffer[startPosition] };
return true;
}
sib = CodeBuffer[startPosition + bytesNeeded];
@ -85,7 +80,7 @@ public class AddImmToRm32SignExtendedHandler : InstructionHandler
// Handle displacement
int dispSize = 0;
if (mod == 0 && rm == 5) // 32-bit displacement
if (mod == 0 && rm == RegisterIndex.Di) // 32-bit displacement
{
dispSize = 4;
}
@ -102,21 +97,15 @@ public class AddImmToRm32SignExtendedHandler : InstructionHandler
if (startPosition + bytesNeeded + dispSize >= Length)
{
instruction.Operands = "??";
instruction.RawBytes = new byte[] { opcode, modRM };
instruction.RawBytes = new byte[] { opcode, CodeBuffer[startPosition] };
return true;
}
bytesNeeded += dispSize; // Add displacement bytes
// Use ModRMDecoder to decode the destination operand
var modRMDecoder = new ModRMDecoder(CodeBuffer, Decoder, Length);
// Set the decoder position to after the ModR/M byte
Decoder.SetPosition(startPosition + 1);
// Decode the destination operand
string destOperand = modRMDecoder.DecodeModRM(mod, rm, false);
// Get the position after decoding the ModR/M byte
int newPosition = Decoder.GetPosition();
@ -141,15 +130,21 @@ public class AddImmToRm32SignExtendedHandler : InstructionHandler
return true;
}
// Read the immediate value as a signed byte and sign-extend it
sbyte imm8 = (sbyte)CodeBuffer[newPosition];
newPosition++; // Advance past the immediate byte
// Read the immediate value as a signed byte and automatically sign-extend it to int
int signExtendedImm = (sbyte)Decoder.ReadByte();
// Set the decoder position
Decoder.SetPosition(newPosition);
// Format the immediate value as a 32-bit hex value (sign-extended)
string immStr = $"0x{(uint)imm8:X8}";
// Format the immediate value as a 32-bit hex value
string immStr;
if (signExtendedImm < 0)
{
// For negative values, use the full 32-bit representation (0xFFFFFFxx)
immStr = $"0x{(uint)signExtendedImm:X8}";
}
else
{
// For positive values, use the regular format
immStr = $"0x{signExtendedImm:X8}";
}
// Set the operands
instruction.Operands = $"{destOperand}, {immStr}";