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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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44
X86Disassembler/X86/Handlers/Sub/SubImmFromRm16SignExtendedHandler.cs
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@ -1,3 +1,5 @@
using X86Disassembler.X86.Operands;
namespace X86Disassembler.X86.Handlers.Sub;
/// <summary>
@ -8,11 +10,9 @@ public class SubImmFromRm16SignExtendedHandler : InstructionHandler
/// <summary>
/// Initializes a new instance of the SubImmFromRm16SignExtendedHandler 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 SubImmFromRm16SignExtendedHandler(byte[] codeBuffer, InstructionDecoder decoder, int length)
: base(codeBuffer, decoder, length)
public SubImmFromRm16SignExtendedHandler(InstructionDecoder decoder)
: base(decoder)
{
}
@ -36,7 +36,7 @@ public class SubImmFromRm16SignExtendedHandler : InstructionHandler
}
// Check if the reg field is 5 (SUB)
byte modRM = CodeBuffer[Decoder.GetPosition()];
byte modRM = Decoder.PeakByte();
byte reg = (byte)((modRM & 0x38) >> 3);
return reg == 5; // 5 = SUB
@ -50,8 +50,8 @@ public class SubImmFromRm16SignExtendedHandler : InstructionHandler
/// <returns>True if the instruction was successfully decoded</returns>
public override bool Decode(byte opcode, Instruction instruction)
{
// Set the mnemonic
instruction.Mnemonic = "sub";
// Set the instruction type
instruction.Type = InstructionType.Sub;
// Check if we have enough bytes for the ModR/M byte
if (!Decoder.CanReadByte())
@ -59,15 +59,14 @@ public class SubImmFromRm16SignExtendedHandler : InstructionHandler
return false;
}
// Extract the fields from the ModR/M byte
var (mod, reg, rm, destOperand) = ModRMDecoder.ReadModRM();
// Read the ModR/M byte
// For SUB r/m16, imm8 (0x83 /5 with 0x66 prefix and sign extension):
// - 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 memory operands, replace "dword" with "word"
string destination = destOperand;
if (mod != 3) // Memory operand
{
destination = destOperand.Replace("dword", "word");
}
// Adjust the operand size to 16-bit
destinationOperand.Size = 16;
// Check if we have enough bytes for the immediate value
if (!Decoder.CanReadByte())
@ -75,11 +74,18 @@ public class SubImmFromRm16SignExtendedHandler : InstructionHandler
return false;
}
// Read the immediate value (8-bit)
byte immediate = Decoder.ReadByte();
// Read the immediate value as a signed byte and automatically sign-extend it to short
short imm16 = (sbyte)Decoder.ReadByte();
// Set the operands
instruction.Operands = $"{destination}, 0x{immediate:X2}";
// Create the source immediate operand with the sign-extended value
var sourceOperand = OperandFactory.CreateImmediateOperand(imm16, 16);
// Set the structured operands
instruction.StructuredOperands =
[
destinationOperand,
sourceOperand
];
return true;
}