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Code Issues Activity

Updated instruction handlers to use Type and StructuredOperands instead of Mnemonic and Operands

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This commit is contained in:
bird_egop
2025-04-14 22:08:50 +03:00
parent c516e063e7
commit 685eeda03d
136 changed files with 3694 additions and 2584 deletions
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64
X86Disassembler/X86/Handlers/Xor/XorImmWithRm16SignExtendedHandler.cs
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@@ -1,3 +1,5 @@
using X86Disassembler.X86.Operands;
namespace X86Disassembler.X86.Handlers.Xor;
/// <summary>
@@ -8,11 +10,9 @@ public class XorImmWithRm16SignExtendedHandler : InstructionHandler
/// <summary>
/// Initializes a new instance of the XorImmWithRm16SignExtendedHandler 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 XorImmWithRm16SignExtendedHandler(byte[] codeBuffer, InstructionDecoder decoder, int length)
: base(codeBuffer, decoder, length)
public XorImmWithRm16SignExtendedHandler(InstructionDecoder decoder)
: base(decoder)
{
}
@@ -30,7 +30,7 @@ public class XorImmWithRm16SignExtendedHandler : InstructionHandler
if (!Decoder.CanReadByte())
return false;
byte modRM = CodeBuffer[Decoder.GetPosition()];
byte modRM = Decoder.PeakByte();
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 6; // 6 = XOR
@@ -44,8 +44,8 @@ public class XorImmWithRm16SignExtendedHandler : InstructionHandler
/// <returns>True if the instruction was successfully decoded</returns>
public override bool Decode(byte opcode, Instruction instruction)
{
// Set the mnemonic
instruction.Mnemonic = "xor";
// Set the instruction type
instruction.Type = InstructionType.Xor;
if (!Decoder.CanReadByte())
{
@@ -53,27 +53,13 @@ public class XorImmWithRm16SignExtendedHandler : InstructionHandler
}
// Read the ModR/M byte
var (mod, reg, rm, memOperand) = ModRMDecoder.ReadModRM();
// For XOR r/m16, imm8 (sign-extended) (0x83 /6 with 0x66 prefix):
// - The r/m field with mod specifies the destination operand (register or memory)
// - The immediate value is the source operand (sign-extended from 8 to 16 bits)
var (mod, reg, rm, destinationOperand) = ModRMDecoder.ReadModRM();
// For the first operand, handle based on addressing mode
string rmOperand;
if (mod == 3) // Register addressing mode
{
// Get 16-bit register name for the operand
rmOperand = ModRMDecoder.GetRegisterName(rm, 16);
}
else // Memory addressing mode
{
// For memory operands, replace "dword ptr" with "word ptr"
if (memOperand.StartsWith("dword ptr "))
{
rmOperand = memOperand.Replace("dword ptr", "word ptr");
}
else
{
rmOperand = memOperand;
}
}
// Adjust the operand size to 16-bit
destinationOperand.Size = 16;
// Read the immediate value (sign-extended from 8 to 16 bits)
if (!Decoder.CanReadByte())
@@ -81,24 +67,18 @@ public class XorImmWithRm16SignExtendedHandler : InstructionHandler
return false;
}
// Read the immediate value as a signed byte and automatically sign-extend it to short
short imm16 = (sbyte)Decoder.ReadByte();
// Format the immediate value
// For 16-bit operations, we want to show the immediate value without leading zeros
string immStr;
if (imm16 < 0)
{
// For negative values, show the full sign-extended 16-bit value
immStr = $"0x{(ushort)imm16:X}";
}
else
{
// For positive values, show without leading zeros
immStr = $"0x{imm16:X}";
}
// Create the source immediate operand with the sign-extended value
var sourceOperand = OperandFactory.CreateImmediateOperand(imm16, 16);
// Set the operands
instruction.Operands = $"{rmOperand}, {immStr}";
// Set the structured operands
instruction.StructuredOperands =
[
destinationOperand,
sourceOperand
];
return true;
}