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Code Issues Releases 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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59
X86Disassembler/X86/Handlers/And/AndImmToRm32SignExtendedHandler.cs
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@ -1,3 +1,5 @@
using X86Disassembler.X86.Operands;
namespace X86Disassembler.X86.Handlers.And;
/// <summary>
@ -8,11 +10,9 @@ public class AndImmToRm32SignExtendedHandler : InstructionHandler
/// <summary>
/// Initializes a new instance of the AndImmToRm32SignExtendedHandler 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 AndImmToRm32SignExtendedHandler(byte[] codeBuffer, InstructionDecoder decoder, int length)
: base(codeBuffer, decoder, length)
public AndImmToRm32SignExtendedHandler(InstructionDecoder decoder)
: base(decoder)
{
}
@ -29,14 +29,13 @@ public class AndImmToRm32SignExtendedHandler : InstructionHandler
}
// Check if we have enough bytes to read the ModR/M byte
int position = Decoder.GetPosition();
if (!Decoder.CanReadByte())
{
return false;
}
// Read the ModR/M byte to check the reg field (bits 5-3)
byte modRM = CodeBuffer[position];
byte modRM = Decoder.PeakByte();
int reg = (modRM >> 3) & 0x7;
// reg = 4 means AND operation
@ -51,11 +50,14 @@ public class AndImmToRm32SignExtendedHandler : InstructionHandler
/// <returns>True if the instruction was successfully decoded</returns>
public override bool Decode(byte opcode, Instruction instruction)
{
// Set the mnemonic
instruction.Mnemonic = "and";
// Set the instruction type
instruction.Type = InstructionType.And;
// Read the ModR/M byte
var (mod, reg, rm, memOperand) = ModRMDecoder.ReadModRM();
// For AND r/m32, imm8 (sign-extended) (0x83 /4):
// - 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 32 bits)
var (mod, reg, rm, destinationOperand) = ModRMDecoder.ReadModRM();
if (!Decoder.CanReadByte())
{
@ -63,36 +65,17 @@ public class AndImmToRm32SignExtendedHandler : InstructionHandler
}
// Read the immediate value as a signed byte and automatically sign-extend it to int
int imm = (sbyte) Decoder.ReadByte();
int imm = (sbyte)Decoder.ReadByte();
// Format the destination operand based on addressing mode
string destOperand;
if (mod == 3) // Register addressing mode
{
// Get 32-bit register name
destOperand = ModRMDecoder.GetRegisterName(rm, 32);
}
else // Memory addressing mode
{
// Memory operand already includes dword ptr prefix
destOperand = memOperand;
}
// Format the immediate value
string immStr;
if (imm < 0)
{
// For negative values, use the full 32-bit representation
immStr = $"0x{(uint) imm:X8}";
}
else
{
// For positive values, use the regular format with leading zeros
immStr = $"0x{imm:X8}";
}
// Set the operands
instruction.Operands = $"{destOperand}, {immStr}";
// Create the source immediate operand with the sign-extended value
var sourceOperand = OperandFactory.CreateImmediateOperand(imm, 32);
// Set the structured operands
instruction.StructuredOperands =
[
destinationOperand,
sourceOperand
];
return true;
}