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Fix x86 disassembler issues with direct memory addressing and immediate value formatting

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This commit is contained in:
bird_egop
2025-04-15 02:29:32 +03:00
parent d351f41808
commit 3ea327064a
67 changed files with 854 additions and 453 deletions
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21
X86Disassembler/X86/Handlers/Or/OrRm8R8Handler.cs
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@ -23,7 +23,17 @@ public class OrRm8R8Handler : InstructionHandler
/// <returns>True if this handler can decode the opcode</returns>
public override bool CanHandle(byte opcode)
{
return opcode == 0x08;
if (opcode != 0x08)
return false;
// Check if we can read the ModR/M byte
if (!Decoder.CanReadByte())
return false;
// Peek at the ModR/M byte to verify this is the correct instruction
byte modRM = Decoder.PeakByte();
return true;
}
/// <summary>
@ -43,16 +53,13 @@ public class OrRm8R8Handler : InstructionHandler
return false;
}
// Read the ModR/M byte
// For OR r/m8, r8 (0x08):
// - The r/m field with mod specifies the destination operand (register or memory)
// - The reg field specifies the source register
var (mod, reg, rm, destinationOperand) = ModRMDecoder.ReadModRM();
// Read the ModR/M byte, specifying that we're dealing with 8-bit operands
var (mod, reg, rm, destinationOperand) = ModRMDecoder.ReadModRM8();
// Adjust the operand size to 8-bit
destinationOperand.Size = 8;
// Create the source register operand
// Create the source register operand (8-bit)
var sourceOperand = OperandFactory.CreateRegisterOperand(reg, 8);
// Set the structured operands