Unified ADC accumulator handlers into a single handler

X86Disassembler/X86/Handlers/Call/CallFarPtrHandler.cs

@@ -0,0 +1,94 @@
+using X86Disassembler.X86.Operands;
+
+namespace X86Disassembler.X86.Handlers.Call;
+
+/// <summary>
+/// Handler for CALL m16:32 instruction (FF /3) - Far call with memory operand
+/// </summary>
+public class CallFarPtrHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the CallFarPtrHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public CallFarPtrHandler(InstructionDecoder decoder)
+        : base(decoder)
+    {
+    }
+
+    /// <summary>
+    /// Checks if this handler can decode the given opcode
+    /// </summary>
+    /// <param name="opcode">The opcode to check</param>
+    /// <returns>True if this handler can decode the opcode</returns>
+    public override bool CanHandle(byte opcode)
+    {
+        // CALL m16:32 is encoded as FF /3
+        if (opcode != 0xFF)
+        {
+            return false;
+        }
+        
+        // Check if we have enough bytes to read the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+        
+        // Extract the reg field (bits 3-5)
+        var reg = ModRMDecoder.PeakModRMReg();
+        
+        // CALL m16:32 is encoded as FF /3 (reg field = 3)
+        return reg == 3;
+    }
+
+    /// <summary>
+    /// Decodes a CALL m16:32 instruction (far call)
+    /// </summary>
+    /// <param name="opcode">The opcode of the instruction</param>
+    /// <param name="instruction">The instruction object to populate</param>
+    /// <returns>True if the instruction was successfully decoded</returns>
+    public override bool Decode(byte opcode, Instruction instruction)
+    {
+        // Set the instruction type
+        instruction.Type = InstructionType.Call;
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For CALL m16:32 (FF /3):
+        // - The r/m field with mod specifies the memory operand
+        // - This instruction can only reference memory, not registers
+        var (mod, reg, rm, operand) = ModRMDecoder.ReadModRM();
+
+        // For far calls, we need to ensure this is a memory operand, not a register
+        // If mod == 3, then it's a register operand, which is invalid for far calls
+        if (mod == 3)
+        {
+            return false;
+        }
+
+        // Create a special far pointer operand by modifying the memory operand
+        // to indicate it's a far pointer (fword ptr)
+        // We need to ensure the operand is a memory operand before converting it
+        if (!(operand is MemoryOperand memOperand))
+        {
+            return false;
+        }
+        
+        var farPtrOperand = OperandFactory.CreateFarPointerOperand(memOperand);
+
+        // Set the structured operands
+        // CALL has only one operand
+        instruction.StructuredOperands = 
+        [
+            farPtrOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Call/CallRm32Handler.cs

@@ -39,7 +39,9 @@ public class CallRm32Handler : InstructionHandler
         var reg = ModRMDecoder.PeakModRMReg();
         
         // CALL r/m32 is encoded as FF /2 (reg field = 2)
-        return reg == 2;
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return reg == 2 && !Decoder.HasOperandSizePrefix();
     }
 
     /// <summary>