Unified ADC accumulator handlers into a single handler

X86Disassembler/X86/Handlers/Bit/BsfR32Rm32Handler.cs

@@ -0,0 +1,84 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BSF r32, r/m32 instruction (0F BC)
+/// </summary>
+public class BsfR32Rm32Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BsfR32Rm32Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BsfR32Rm32Handler(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)
+    {
+        // BSF r32, r/m32 is a two-byte opcode: 0F BC
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Check if the second byte is BC
+        var secondByte = Decoder.PeakByte();
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return secondByte == 0xBC && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BSF r32, r/m32 instruction
+    /// </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.Bsf;
+        
+        // Read the second opcode byte (BC)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BSF r32, r/m32 (0F BC):
+        // - The reg field specifies the destination register
+        // - The r/m field with mod specifies the source operand (register or memory)
+        var (_, reg, _, sourceOperand) = ModRMDecoder.ReadModRM();
+
+        // Create the register operand for the reg field
+        var destinationOperand = OperandFactory.CreateRegisterOperand(reg);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            sourceOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Bit/BsrR32Rm32Handler.cs

@@ -0,0 +1,84 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BSR r32, r/m32 instruction (0F BD)
+/// </summary>
+public class BsrR32Rm32Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BsrR32Rm32Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BsrR32Rm32Handler(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)
+    {
+        // BSR r32, r/m32 is a two-byte opcode: 0F BD
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Check if the second byte is BD
+        var secondByte = Decoder.PeakByte();
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return secondByte == 0xBD && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BSR r32, r/m32 instruction
+    /// </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.Bsr;
+        
+        // Read the second opcode byte (BD)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BSR r32, r/m32 (0F BD):
+        // - The reg field specifies the destination register
+        // - The r/m field with mod specifies the source operand (register or memory)
+        var (_, reg, _, sourceOperand) = ModRMDecoder.ReadModRM();
+
+        // Create the register operand for the reg field
+        var destinationOperand = OperandFactory.CreateRegisterOperand(reg);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            sourceOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Bit/BtR32Rm32Handler.cs

@@ -0,0 +1,84 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BT r32, r/m32 instruction (0F A3)
+/// </summary>
+public class BtR32Rm32Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BtR32Rm32Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BtR32Rm32Handler(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)
+    {
+        // BT r32, r/m32 is a two-byte opcode: 0F A3
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Check if the second byte is A3
+        var secondByte = Decoder.PeakByte();
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return secondByte == 0xA3 && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BT r32, r/m32 instruction
+    /// </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.Bt;
+        
+        // Read the second opcode byte (A3)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BT r/m32, r32 (0F A3):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The reg field specifies the bit index register
+        var (_, reg, _, destinationOperand) = ModRMDecoder.ReadModRM();
+
+        // Create the register operand for the reg field
+        var bitIndexOperand = OperandFactory.CreateRegisterOperand(reg);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            bitIndexOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Bit/BtRm32ImmHandler.cs

@@ -0,0 +1,101 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BT r/m32, imm8 instruction (0F BA /4)
+/// </summary>
+public class BtRm32ImmHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BtRm32ImmHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BtRm32ImmHandler(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)
+    {
+        // BT r/m32, imm8 is encoded as 0F BA /4
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanRead(2))
+        {
+            return false;
+        }
+
+        var (secondByte, modRm) = Decoder.PeakTwoBytes();
+
+        // Check if the second byte is BA
+        if (secondByte != 0xBA)
+        {
+            return false;
+        }
+
+        // Check if the reg field of the ModR/M byte is 4 (BT)
+        var reg = ModRMDecoder.GetRegFromModRM(modRm);
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return reg == 4 && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BT r/m32, imm8 instruction
+    /// </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.Bt;
+        
+        // Read the second opcode byte (BA)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BT r/m32, imm8 (0F BA /4):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The immediate value specifies the bit index
+        var (_, _, _, destinationOperand) = ModRMDecoder.ReadModRM();
+
+        // Check if we have enough bytes for the immediate value
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the immediate byte for the bit position
+        byte imm8 = Decoder.ReadByte();
+
+        // Create the immediate operand
+        var bitIndexOperand = OperandFactory.CreateImmediateOperand(imm8, 8);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            bitIndexOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Bit/BtcR32Rm32Handler.cs

@@ -0,0 +1,84 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BTC r32, r/m32 instruction (0F BB)
+/// </summary>
+public class BtcR32Rm32Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BtcR32Rm32Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BtcR32Rm32Handler(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)
+    {
+        // BTC r32, r/m32 is a two-byte opcode: 0F BB
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Check if the second byte is BB
+        var secondByte = Decoder.PeakByte();
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return secondByte == 0xBB && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BTC r32, r/m32 instruction
+    /// </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.Btc;
+        
+        // Read the second opcode byte (BB)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BTC r/m32, r32 (0F BB):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The reg field specifies the bit index register
+        var (_, reg, _, destinationOperand) = ModRMDecoder.ReadModRM();
+
+        // Create the register operand for the reg field
+        var bitIndexOperand = OperandFactory.CreateRegisterOperand(reg);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            bitIndexOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Bit/BtcRm32ImmHandler.cs

@@ -0,0 +1,101 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BTC r/m32, imm8 instruction (0F BA /7)
+/// </summary>
+public class BtcRm32ImmHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BtcRm32ImmHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BtcRm32ImmHandler(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)
+    {
+        // BTC r/m32, imm8 is encoded as 0F BA /7
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanRead(2))
+        {
+            return false;
+        }
+
+        var (secondByte, modRm) = Decoder.PeakTwoBytes();
+
+        // Check if the second byte is BA
+        if (secondByte != 0xBA)
+        {
+            return false;
+        }
+
+        // Check if the reg field of the ModR/M byte is 7 (BTC)
+        var reg = ModRMDecoder.GetRegFromModRM(modRm);
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return reg == 7 && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BTC r/m32, imm8 instruction
+    /// </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.Btc;
+        
+        // Read the second opcode byte (BA)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BTC r/m32, imm8 (0F BA /7):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The immediate value specifies the bit index
+        var (_, _, _, destinationOperand) = ModRMDecoder.ReadModRM();
+
+        // Check if we have enough bytes for the immediate value
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the immediate byte for the bit position
+        byte imm8 = Decoder.ReadByte();
+
+        // Create the immediate operand
+        var bitIndexOperand = OperandFactory.CreateImmediateOperand(imm8, 8);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            bitIndexOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Bit/BtrR32Rm32Handler.cs

@@ -0,0 +1,84 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BTR r32, r/m32 instruction (0F B3)
+/// </summary>
+public class BtrR32Rm32Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BtrR32Rm32Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BtrR32Rm32Handler(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)
+    {
+        // BTR r32, r/m32 is a two-byte opcode: 0F B3
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Check if the second byte is B3
+        var secondByte = Decoder.PeakByte();
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return secondByte == 0xB3 && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BTR r32, r/m32 instruction
+    /// </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.Btr;
+        
+        // Read the second opcode byte (B3)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BTR r/m32, r32 (0F B3):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The reg field specifies the bit index register
+        var (_, reg, _, destinationOperand) = ModRMDecoder.ReadModRM();
+
+        // Create the register operand for the reg field
+        var bitIndexOperand = OperandFactory.CreateRegisterOperand(reg);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            bitIndexOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Bit/BtrRm32ImmHandler.cs

@@ -0,0 +1,102 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BTR r/m32, imm8 instruction (0F BA /6)
+/// </summary>
+public class BtrRm32ImmHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BtrRm32ImmHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BtrRm32ImmHandler(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)
+    {
+        // BTR r/m32, imm8 is encoded as 0F BA /6
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanRead(2))
+        {
+            return false;
+        }
+
+        var (secondByte, modRm) = Decoder.PeakTwoBytes();
+
+        // Check if the second byte is BA
+        if (secondByte != 0xBA)
+        {
+            return false;
+        }
+
+        // Check if the reg field of the ModR/M byte is 6 (BTR)
+        var reg = ModRMDecoder.GetRegFromModRM(modRm);
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return reg == 6 && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BTR r/m32, imm8 instruction
+    /// </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.Btr;
+        
+        // Read the second opcode byte (BA)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BTR r/m32, imm8 (0F BA /6):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The immediate value specifies the bit index
+        var (_, _, _, destinationOperand) = ModRMDecoder.ReadModRM();
+
+        // Check if we have enough bytes for the immediate value
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the immediate byte for the bit position
+        byte imm8 = Decoder.ReadByte();
+
+        // Create the immediate operand
+        var bitIndexOperand = OperandFactory.CreateImmediateOperand(imm8, 8);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            bitIndexOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Bit/BtsR32Rm32Handler.cs

@@ -0,0 +1,84 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BTS r32, r/m32 instruction (0F AB)
+/// </summary>
+public class BtsR32Rm32Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BtsR32Rm32Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BtsR32Rm32Handler(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)
+    {
+        // BTS r32, r/m32 is a two-byte opcode: 0F AB
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Check if the second byte is AB
+        var secondByte = Decoder.PeakByte();
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return secondByte == 0xAB && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BTS r32, r/m32 instruction
+    /// </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.Bts;
+
+        // Read the second opcode byte (AB)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BTS r/m32, r32 (0F AB):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The reg field specifies the bit index register
+        var (_, reg, _, destinationOperand) = ModRMDecoder.ReadModRM();
+
+        // Create the register operand for the reg field
+        var bitIndexOperand = OperandFactory.CreateRegisterOperand(reg);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            bitIndexOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Bit/BtsRm32ImmHandler.cs

@@ -0,0 +1,101 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BTS r/m32, imm8 instruction (0F BA /5)
+/// </summary>
+public class BtsRm32ImmHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BtsRm32ImmHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BtsRm32ImmHandler(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)
+    {
+        // BTS r/m32, imm8 is encoded as 0F BA /5
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanRead(2))
+        {
+            return false;
+        }
+
+        var (secondByte, modRm) = Decoder.PeakTwoBytes();
+
+        // Check if the second byte is BA
+        if (secondByte != 0xBA)
+        {
+            return false;
+        }
+
+        // Check if the reg field of the ModR/M byte is 5 (BTS)
+        var reg = ModRMDecoder.GetRegFromModRM(modRm);
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return reg == 5 && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BTS r/m32, imm8 instruction
+    /// </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.Bts;
+        
+        // Read the second opcode byte (BA)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BTS r/m32, imm8 (0F BA /5):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The immediate value specifies the bit index
+        var (_, _, _, destinationOperand) = ModRMDecoder.ReadModRM();
+
+        // Check if we have enough bytes for the immediate value
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the immediate byte for the bit position
+        byte imm8 = Decoder.ReadByte();
+
+        // Create the immediate operand
+        var bitIndexOperand = OperandFactory.CreateImmediateOperand(imm8, 8);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            bitIndexOperand
+        ];
+
+        return true;
+    }
+}