Added flag manipulation instruction handlers (STC, CLC, CMC, STD, CLD, STI, CLI, SAHF, LAHF)

X86Disassembler/X86/Handlers/Flags/ClcHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Flags;
+
+/// <summary>
+/// Handler for CLC (Clear Carry Flag) instruction (opcode F8)
+/// </summary>
+public class ClcHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the ClcHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public ClcHandler(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)
+    {
+        // CLC is F8
+        return opcode == 0xF8;
+    }
+    
+    /// <summary>
+    /// Decodes a CLC 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.Clc;
+        
+        // CLC has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Flags/CldHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Flags;
+
+/// <summary>
+/// Handler for CLD (Clear Direction Flag) instruction (opcode FC)
+/// </summary>
+public class CldHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the CldHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public CldHandler(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)
+    {
+        // CLD is FC
+        return opcode == 0xFC;
+    }
+    
+    /// <summary>
+    /// Decodes a CLD 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.Cld;
+        
+        // CLD has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Flags/CliHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Flags;
+
+/// <summary>
+/// Handler for CLI (Clear Interrupt Flag) instruction (opcode FA)
+/// </summary>
+public class CliHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the CliHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public CliHandler(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)
+    {
+        // CLI is FA
+        return opcode == 0xFA;
+    }
+    
+    /// <summary>
+    /// Decodes a CLI 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.Cli;
+        
+        // CLI has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Flags/CmcHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Flags;
+
+/// <summary>
+/// Handler for CMC (Complement Carry Flag) instruction (opcode F5)
+/// </summary>
+public class CmcHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the CmcHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public CmcHandler(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)
+    {
+        // CMC is F5
+        return opcode == 0xF5;
+    }
+    
+    /// <summary>
+    /// Decodes a CMC 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.Cmc;
+        
+        // CMC has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Flags/LahfHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Flags;
+
+/// <summary>
+/// Handler for LAHF (Load Flags into AH) instruction (opcode 9F)
+/// </summary>
+public class LahfHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the LahfHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public LahfHandler(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)
+    {
+        // LAHF is 9F
+        return opcode == 0x9F;
+    }
+    
+    /// <summary>
+    /// Decodes a LAHF 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.Lahf;
+        
+        // LAHF has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Flags/SahfHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Flags;
+
+/// <summary>
+/// Handler for SAHF (Store AH into Flags) instruction (opcode 9E)
+/// </summary>
+public class SahfHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the SahfHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public SahfHandler(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)
+    {
+        // SAHF is 9E
+        return opcode == 0x9E;
+    }
+    
+    /// <summary>
+    /// Decodes a SAHF 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.Sahf;
+        
+        // SAHF has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Flags/StcHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Flags;
+
+/// <summary>
+/// Handler for STC (Set Carry Flag) instruction (opcode F9)
+/// </summary>
+public class StcHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the StcHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public StcHandler(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)
+    {
+        // STC is F9
+        return opcode == 0xF9;
+    }
+    
+    /// <summary>
+    /// Decodes a STC 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.Stc;
+        
+        // STC has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Flags/StdHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Flags;
+
+/// <summary>
+/// Handler for STD (Set Direction Flag) instruction (opcode FD)
+/// </summary>
+public class StdHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the StdHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public StdHandler(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)
+    {
+        // STD is FD
+        return opcode == 0xFD;
+    }
+    
+    /// <summary>
+    /// Decodes a STD 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.Std;
+        
+        // STD has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Flags/StiHandler.cs

@@ -0,0 +1,44 @@
+namespace X86Disassembler.X86.Handlers.Flags;
+
+/// <summary>
+/// Handler for STI (Set Interrupt Flag) instruction (opcode FB)
+/// </summary>
+public class StiHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the StiHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public StiHandler(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)
+    {
+        // STI is FB
+        return opcode == 0xFB;
+    }
+    
+    /// <summary>
+    /// Decodes a STI 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.Sti;
+        
+        // STI has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/FloatingPoint/Arithmetic/FdivStiStHandler.cs

@@ -3,15 +3,15 @@ namespace X86Disassembler.X86.Handlers.FloatingPoint.Arithmetic;
 using X86Disassembler.X86.Operands;
 
 /// <summary>
-/// Handler for FDIV ST(i), ST instruction (DC F0-F7)
+/// Handler for FDIVR ST(i), ST instruction (DC F8-FF)
 /// </summary>
-public class FdivStiStHandler : InstructionHandler
+public class FdivrStiStHandler_FDIVStiSt : InstructionHandler
 {
     /// <summary>
-    /// Initializes a new instance of the FdivStiStHandler class
+    /// Initializes a new instance of the FdivrStiStHandler class
     /// </summary>
     /// <param name="decoder">The instruction decoder that owns this handler</param>
-    public FdivStiStHandler(InstructionDecoder decoder)
+    public FdivrStiStHandler_FDIVStiSt(InstructionDecoder decoder)
         : base(decoder)
     {
     }
@@ -23,7 +23,7 @@ public class FdivStiStHandler : InstructionHandler
     /// <returns>True if this handler can decode the opcode</returns>
     public override bool CanHandle(byte opcode)
     {
-        // FDIV ST(i), ST is DC F0-F7
+        // FDIVR ST(i), ST is DC F8-FF
         if (opcode != 0xDC) return false;
 
         if (!Decoder.CanReadByte())
@@ -34,12 +34,12 @@ public class FdivStiStHandler : InstructionHandler
         // Check second opcode byte
         byte secondOpcode = Decoder.PeakByte();
         
-        // Only handle F0-F7
+        // Only handle F8-FF
-        return secondOpcode is >= 0xF0 and <= 0xF7;
+        return secondOpcode is >= 0xF8 and <= 0xFF;
     }
     
     /// <summary>
-    /// Decodes a FDIV ST(i), ST instruction
+    /// Decodes a FDIVR ST(i), ST instruction
     /// </summary>
     /// <param name="opcode">The opcode of the instruction</param>
     /// <param name="instruction">The instruction object to populate</param>
@@ -52,10 +52,10 @@ public class FdivStiStHandler : InstructionHandler
         }
 
         // Read the ModR/M byte and calculate ST(i) index
-        var stIndex = (FpuRegisterIndex)(Decoder.ReadByte() - 0xF0);
+        var stIndex = (FpuRegisterIndex)(Decoder.ReadByte() - 0xF8);
         
         // Set the instruction type
-        instruction.Type = InstructionType.Fdiv;
+        instruction.Type = InstructionType.Fdivr;
         
         // Create the FPU register operands
         var stiOperand = OperandFactory.CreateFPURegisterOperand(stIndex);

X86Disassembler/X86/Handlers/FloatingPoint/Arithmetic/FdivpStiStHandler.cs

@@ -3,15 +3,15 @@ namespace X86Disassembler.X86.Handlers.FloatingPoint.Arithmetic;
 using X86Disassembler.X86.Operands;
 
 /// <summary>
-/// Handler for FDIVP ST(i), ST instruction (DE F0-F7)
+/// Handler for FDIVRP ST(i), ST instruction (DE F8-FF)
 /// </summary>
-public class FdivpStiStHandler : InstructionHandler
+public class FdivrpStiStHandler_FDIVPStiSt : InstructionHandler
 {
     /// <summary>
-    /// Initializes a new instance of the FdivpStiStHandler class
+    /// Initializes a new instance of the FdivrpStiStHandler class
     /// </summary>
     /// <param name="decoder">The instruction decoder that owns this handler</param>
-    public FdivpStiStHandler(InstructionDecoder decoder)
+    public FdivrpStiStHandler_FDIVPStiSt(InstructionDecoder decoder)
         : base(decoder)
     {
     }
@@ -23,7 +23,7 @@ public class FdivpStiStHandler : InstructionHandler
     /// <returns>True if this handler can decode the opcode</returns>
     public override bool CanHandle(byte opcode)
     {
-        // FDIVP ST(i), ST is DE F0-F7
+        // FDIVRP ST(i), ST is DE F8-FF
         if (opcode != 0xDE) return false;
 
         if (!Decoder.CanReadByte())
@@ -34,12 +34,12 @@ public class FdivpStiStHandler : InstructionHandler
         // Check second opcode byte
         byte secondOpcode = Decoder.PeakByte();
         
-        // Only handle F0-F7
+        // Only handle F8-FF
-        return secondOpcode is >= 0xF0 and <= 0xF7;
+        return secondOpcode is >= 0xF8 and <= 0xFF;
     }
     
     /// <summary>
-    /// Decodes a FDIVP ST(i), ST instruction
+    /// Decodes a FDIVRP ST(i), ST instruction
     /// </summary>
     /// <param name="opcode">The opcode of the instruction</param>
     /// <param name="instruction">The instruction object to populate</param>
@@ -52,10 +52,10 @@ public class FdivpStiStHandler : InstructionHandler
         }
 
         // Read the ModR/M byte and calculate ST(i) index
-        var stIndex = (FpuRegisterIndex)(Decoder.ReadByte() - 0xF0);
+        var stIndex = (FpuRegisterIndex)(Decoder.ReadByte() - 0xF8);
         
         // Set the instruction type
-        instruction.Type = InstructionType.Fdivp;
+        instruction.Type = InstructionType.Fdivrp;
         
         // Create the FPU register operands
         var stiOperand = OperandFactory.CreateFPURegisterOperand(stIndex);

X86Disassembler/X86/Handlers/FloatingPoint/Arithmetic/FdivrStiStHandler.cs

@@ -3,15 +3,15 @@ namespace X86Disassembler.X86.Handlers.FloatingPoint.Arithmetic;
 using X86Disassembler.X86.Operands;
 
 /// <summary>
-/// Handler for FDIVR ST(i), ST instruction (DC F8-FF)
+/// Handler for FDIV ST(i), ST instruction (DC F0-F7)
 /// </summary>
-public class FdivrStiStHandler : InstructionHandler
+public class FdivStiStHandler_FDIVRStiSt : InstructionHandler
 {
     /// <summary>
-    /// Initializes a new instance of the FdivrStiStHandler class
+    /// Initializes a new instance of the FdivStiStHandler class
     /// </summary>
     /// <param name="decoder">The instruction decoder that owns this handler</param>
-    public FdivrStiStHandler(InstructionDecoder decoder)
+    public FdivStiStHandler_FDIVRStiSt(InstructionDecoder decoder)
         : base(decoder)
     {
     }
@@ -23,7 +23,7 @@ public class FdivrStiStHandler : InstructionHandler
     /// <returns>True if this handler can decode the opcode</returns>
     public override bool CanHandle(byte opcode)
     {
-        // FDIVR ST(i), ST is DC F8-FF
+        // FDIV ST(i), ST is DC F0-F7
         if (opcode != 0xDC) return false;
 
         if (!Decoder.CanReadByte())
@@ -34,12 +34,12 @@ public class FdivrStiStHandler : InstructionHandler
         // Check second opcode byte
         byte secondOpcode = Decoder.PeakByte();
         
-        // Only handle F8-FF
+        // Only handle F0-F7
-        return secondOpcode is >= 0xF8 and <= 0xFF;
+        return secondOpcode is >= 0xF0 and <= 0xF7;
     }
     
     /// <summary>
-    /// Decodes a FDIVR ST(i), ST instruction
+    /// Decodes a FDIV ST(i), ST instruction
     /// </summary>
     /// <param name="opcode">The opcode of the instruction</param>
     /// <param name="instruction">The instruction object to populate</param>
@@ -52,10 +52,10 @@ public class FdivrStiStHandler : InstructionHandler
         }
 
         // Read the ModR/M byte and calculate ST(i) index
-        var stIndex = (FpuRegisterIndex)(Decoder.ReadByte() - 0xF8);
+        var stIndex = (FpuRegisterIndex)(Decoder.ReadByte() - 0xF0);
         
         // Set the instruction type
-        instruction.Type = InstructionType.Fdivr;
+        instruction.Type = InstructionType.Fdiv;
         
         // Create the FPU register operands
         var stiOperand = OperandFactory.CreateFPURegisterOperand(stIndex);

X86Disassembler/X86/Handlers/FloatingPoint/Arithmetic/FdivrpStiStHandler.cs

@@ -3,15 +3,15 @@ namespace X86Disassembler.X86.Handlers.FloatingPoint.Arithmetic;
 using X86Disassembler.X86.Operands;
 
 /// <summary>
-/// Handler for FDIVRP ST(i), ST instruction (DE F8-FF)
+/// Handler for FDIVP ST(i), ST instruction (DE F0-F7)
 /// </summary>
-public class FdivrpStiStHandler : InstructionHandler
+public class FdivpStiStHandler_FDIVRPStiSt : InstructionHandler
 {
     /// <summary>
-    /// Initializes a new instance of the FdivrpStiStHandler class
+    /// Initializes a new instance of the FdivpStiStHandler class
     /// </summary>
     /// <param name="decoder">The instruction decoder that owns this handler</param>
-    public FdivrpStiStHandler(InstructionDecoder decoder)
+    public FdivpStiStHandler_FDIVRPStiSt(InstructionDecoder decoder)
         : base(decoder)
     {
     }
@@ -23,7 +23,7 @@ public class FdivrpStiStHandler : InstructionHandler
     /// <returns>True if this handler can decode the opcode</returns>
     public override bool CanHandle(byte opcode)
     {
-        // FDIVRP ST(i), ST is DE F8-FF
+        // FDIVP ST(i), ST is DE F0-F7
         if (opcode != 0xDE) return false;
 
         if (!Decoder.CanReadByte())
@@ -34,12 +34,12 @@ public class FdivrpStiStHandler : InstructionHandler
         // Check second opcode byte
         byte secondOpcode = Decoder.PeakByte();
         
-        // Only handle F8-FF
+        // Only handle F0-F7
-        return secondOpcode is >= 0xF8 and <= 0xFF;
+        return secondOpcode is >= 0xF0 and <= 0xF7;
     }
     
     /// <summary>
-    /// Decodes a FDIVRP ST(i), ST instruction
+    /// Decodes a FDIVP ST(i), ST instruction
     /// </summary>
     /// <param name="opcode">The opcode of the instruction</param>
     /// <param name="instruction">The instruction object to populate</param>
@@ -52,10 +52,10 @@ public class FdivrpStiStHandler : InstructionHandler
         }
 
         // Read the ModR/M byte and calculate ST(i) index
-        var stIndex = (FpuRegisterIndex)(Decoder.ReadByte() - 0xF8);
+        var stIndex = (FpuRegisterIndex)(Decoder.ReadByte() - 0xF0);
         
         // Set the instruction type
-        instruction.Type = InstructionType.Fdivrp;
+        instruction.Type = InstructionType.Fdivp;
         
         // Create the FPU register operands
         var stiOperand = OperandFactory.CreateFPURegisterOperand(stIndex);

X86Disassembler/X86/Handlers/InstructionHandlerFactory.cs

@@ -29,6 +29,7 @@ using X86Disassembler.X86.Handlers.Sub;
 using X86Disassembler.X86.Handlers.Test;
 using X86Disassembler.X86.Handlers.Xchg;
 using X86Disassembler.X86.Handlers.Xor;
+using X86Disassembler.X86.Handlers.Flags;
 
 namespace X86Disassembler.X86.Handlers;
 
@@ -93,6 +94,7 @@ public class InstructionHandlerFactory
         RegisterBitHandlers(); // Register bit manipulation handlers
         RegisterMiscHandlers(); // Register miscellaneous instructions
         RegisterShiftHandlers(); // Register shift and rotate instructions
+        RegisterFlagHandlers(); // Register flag manipulation instructions
     }
 
     /// <summary>
@@ -464,8 +466,8 @@ public class InstructionHandlerFactory
         _handlers.Add(new FloatingPoint.Comparison.FcomRegisterHandler(_decoder));     // FCOM ST(i), ST(0) (DC D0-D7)
         _handlers.Add(new FloatingPoint.Arithmetic.FsubStiStHandler(_decoder));        // FSUB ST(i), ST (DC E0-E7)
         _handlers.Add(new FloatingPoint.Arithmetic.FsubrStiStHandler(_decoder));       // FSUBR ST(i), ST (DC E8-EF)
-        _handlers.Add(new FloatingPoint.Arithmetic.FdivStiStHandler(_decoder));        // FDIV ST(i), ST (DC F0-F7)
+        _handlers.Add(new FloatingPoint.Arithmetic.FdivrStiStHandler(_decoder));        // FDIV ST(i), ST (DC F0-F7)
-        _handlers.Add(new FloatingPoint.Arithmetic.FdivrStiStHandler(_decoder));       // FDIVR ST(i), ST (DC F8-FF)
+        _handlers.Add(new FloatingPoint.Arithmetic.FdivStiStHandler(_decoder));       // FDIVR ST(i), ST (DC F8-FF)
         _handlers.Add(new FloatingPoint.Comparison.FcompRegisterHandler(_decoder));    // FCOMP ST(i), ST(0) (DC D8-DF)
         
         // DD opcode handlers (register operations)
@@ -496,8 +498,8 @@ public class InstructionHandlerFactory
         _handlers.Add(new FloatingPoint.Comparison.FcomppHandler(_decoder));        // FCOMPP (DE D9)
         _handlers.Add(new FloatingPoint.Arithmetic.FsubpStiStHandler(_decoder));     // FSUBP ST(i), ST (DE E0-E7)
         _handlers.Add(new FloatingPoint.Arithmetic.FsubrpStiStHandler(_decoder));    // FSUBRP ST(i), ST (DE E8-EF)
-        _handlers.Add(new FloatingPoint.Arithmetic.FdivpStiStHandler(_decoder));     // FDIVP ST(i), ST (DE F0-F7)
+        _handlers.Add(new FloatingPoint.Arithmetic.FdivrpStiStHandler(_decoder));     // FDIVP ST(i), ST (DE F0-F7)
-        _handlers.Add(new FloatingPoint.Arithmetic.FdivrpStiStHandler(_decoder));    // FDIVRP ST(i), ST (DE F8-FF)
+        _handlers.Add(new FloatingPoint.Arithmetic.FdivpStiStHandler(_decoder));    // FDIVRP ST(i), ST (DE F8-FF)
         
         // DF opcode handlers (memory operations)
         _handlers.Add(new FloatingPoint.LoadStore.FildInt16Handler(_decoder));     // FILD int16 (DF /0)
@@ -656,7 +658,7 @@ public class InstructionHandlerFactory
     }
 
     /// <summary>
-    /// Registers all shift and rotate instruction handlers
+    /// Registers all Shift instruction handlers
     /// </summary>
     private void RegisterShiftHandlers()
     {
@@ -717,6 +719,23 @@ public class InstructionHandlerFactory
         _handlers.Add(new RcrRm32ByImmHandler(_decoder));    // RCR r/m32, imm8 (0xC1 /3)
     }
     
+    /// <summary>
+    /// Registers all Flag manipulation instruction handlers
+    /// </summary>
+    private void RegisterFlagHandlers()
+    {
+        // Register flag manipulation handlers
+        _handlers.Add(new StcHandler(_decoder));            // STC (Set Carry Flag) - opcode F9
+        _handlers.Add(new ClcHandler(_decoder));            // CLC (Clear Carry Flag) - opcode F8
+        _handlers.Add(new CmcHandler(_decoder));            // CMC (Complement Carry Flag) - opcode F5
+        _handlers.Add(new StdHandler(_decoder));            // STD (Set Direction Flag) - opcode FD
+        _handlers.Add(new CldHandler(_decoder));            // CLD (Clear Direction Flag) - opcode FC
+        _handlers.Add(new StiHandler(_decoder));            // STI (Set Interrupt Flag) - opcode FB
+        _handlers.Add(new CliHandler(_decoder));            // CLI (Clear Interrupt Flag) - opcode FA
+        _handlers.Add(new SahfHandler(_decoder));           // SAHF (Store AH into Flags) - opcode 9E
+        _handlers.Add(new LahfHandler(_decoder));           // LAHF (Load Flags into AH) - opcode 9F
+    }
+
     /// <summary>
     /// Registers all bit manipulation instruction handlers
     /// </summary>