extraops.h File Reference

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Functions
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeInvalid)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeUnimplemented)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcode0F0B)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeLar)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeLsl)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeClts)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeStoreControlReg)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeStoreDebugReg)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeLoadControlReg)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeLoadDebugReg)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodePushFs)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodePopFs)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeBitTest)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeShld)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodePushGs)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodePopGs)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeBts)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeShrd)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeImul)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeCmpXchgByte)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeCmpXchg)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeLss)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeBtr)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeLfsLgs)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeMovzxByte)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeMovzxWord)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeBtc)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeBsf)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeBsr)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeMovsxByte)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeMovsxWord)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeConditionalJmp)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeConditionalSet)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeXaddByte)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeXadd)
	FAST486_OPCODE_HANDLER (Fast486ExtOpcodeBswap)
	FAST486_OPCODE_HANDLER (Fast486OpcodeExtended)

Function Documentation

FAST486_OPCODE_HANDLER() [1/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcode0F0B

)

Definition at line 313 of file extraops.c.

{
    /* Reserved opcode (UD2) */
    Fast486Exception(State, FAST486_EXCEPTION_UD);
}

FAST486_OPCODE_HANDLER() [2/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeBitTest

)

Definition at line 723 of file extraops.c.

{
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
    UINT DataSize;
    ULONG BitNumber;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the number of bits */
    if (OperandSize) DataSize = 32;
    else DataSize = 16;
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Get the bit number */
    BitNumber = OperandSize ? State->GeneralRegs[ModRegRm.Register].Long
                            : (ULONG)State->GeneralRegs[ModRegRm.Register].LowWord;
 
    if (ModRegRm.Memory)
    {
        /*
         * For memory operands, add the bit offset divided by
         * the data size to the address
         */
        ModRegRm.MemoryAddress += (BitNumber / DataSize) * (DataSize / 8);
    }
 
    /* Normalize the bit number */
    BitNumber %= DataSize;
 
    if (OperandSize)
    {
        ULONG Value;
 
        /* Read the value */
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
 
        /* Set CF to the bit value */
        State->Flags.Cf = (Value >> BitNumber) & 1;
    }
    else
    {
        USHORT Value;
 
        /* Read the value */
        if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
 
        /* Set CF to the bit value */
        State->Flags.Cf = (Value >> BitNumber) & 1;
    }
}

FAST486_OPCODE_HANDLER() [3/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeBsf

)

Definition at line 1643 of file extraops.c.

{
    UINT i;
    ULONG Value = 0;
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
    ULONG BitNumber;
    UINT DataSize;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Make sure this is the right instruction */
    ASSERT(Opcode == 0xBC);
 
    /* Get the number of bits */
    if (OperandSize) DataSize = 32;
    else DataSize = 16;
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Read the value */
    if (OperandSize)
    {
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
    }
    else
    {
        if (!Fast486ReadModrmWordOperands(State,
                                          &ModRegRm,
                                          (PUSHORT)NULL,
                                          (PUSHORT)&Value))
        {
            /* Exception occurred */
            return;
        }
    }
 
    /* Set ZF */
    State->Flags.Zf = (Value == 0);
    if (State->Flags.Zf) return;
 
    for (i = 0; i < DataSize; i++)
    {
        if (Value & (1 << i))
        {
            /* Save the bit number */
            BitNumber = i;
 
            /* Exit the loop */
            break;
        }
    }
 
    /* Write back the result */
    if (OperandSize) Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, BitNumber);
    else Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(BitNumber));
}

FAST486_OPCODE_HANDLER() [4/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeBsr

)

Definition at line 1712 of file extraops.c.

{
    INT i;
    ULONG Value = 0;
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
    ULONG BitNumber;
    UINT DataSize;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Make sure this is the right instruction */
    ASSERT(Opcode == 0xBD);
 
    /* Get the number of bits */
    if (OperandSize) DataSize = 32;
    else DataSize = 16;
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Read the value */
    if (OperandSize)
    {
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
    }
    else
    {
        if (!Fast486ReadModrmWordOperands(State,
                                          &ModRegRm,
                                          (PUSHORT)NULL,
                                          (PUSHORT)&Value))
        {
            /* Exception occurred */
            return;
        }
    }
 
    /* Set ZF according to the value */
    State->Flags.Zf = (Value == 0);
    if (State->Flags.Zf) return;
 
    for (i = DataSize - 1; i >= 0; i--)
    {
        if (Value & (1 << i))
        {
            /* Save the bit number */
            BitNumber = i;
 
            /* Exit the loop */
            break;
        }
    }
 
    /* Write back the result */
    if (OperandSize) Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, BitNumber);
    else Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(BitNumber));
}

FAST486_OPCODE_HANDLER() [5/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeBswap

)

Definition at line 2182 of file extraops.c.

{
    PUCHAR Pointer;
 
    NO_LOCK_PREFIX();
 
    /* Get a pointer to the value */
    Pointer = (PUCHAR)&State->GeneralRegs[Opcode & 0x07].Long;
 
    /* Swap the byte order */
    SWAP(Pointer[0], Pointer[3]);
    SWAP(Pointer[1], Pointer[2]);
}

FAST486_OPCODE_HANDLER() [6/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeBtc

)

Definition at line 1563 of file extraops.c.

{
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
    UINT DataSize;
    ULONG BitNumber;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the number of bits */
    if (OperandSize) DataSize = 32;
    else DataSize = 16;
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Get the bit number */
    BitNumber = OperandSize ? State->GeneralRegs[ModRegRm.Register].Long
                            : (ULONG)State->GeneralRegs[ModRegRm.Register].LowWord;
 
    if (ModRegRm.Memory)
    {
        /*
         * For memory operands, add the bit offset divided by
         * the data size to the address
         */
        ModRegRm.MemoryAddress += (BitNumber / DataSize) * (DataSize / 8);
    }
 
    /* Normalize the bit number */
    BitNumber %= DataSize;
 
    if (OperandSize)
    {
        ULONG Value;
 
        /* Read the value */
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
 
        /* Set CF to the bit value */
        State->Flags.Cf = (Value >> BitNumber) & 1;
 
        /* Toggle the bit */
        Value ^= 1 << BitNumber;
 
        /* Write back the result */
        Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
    }
    else
    {
        USHORT Value;
 
        /* Read the value */
        if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
 
        /* Set CF to the bit value */
        State->Flags.Cf = (Value >> BitNumber) & 1;
 
        /* Toggle the bit */
        Value ^= 1 << BitNumber;
 
        /* Write back the result */
        Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
    }
}

FAST486_OPCODE_HANDLER() [7/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeBtr

)

Definition at line 1349 of file extraops.c.

{
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
    UINT DataSize;
    ULONG BitNumber;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the number of bits */
    if (OperandSize) DataSize = 32;
    else DataSize = 16;
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Get the bit number */
    BitNumber = OperandSize ? State->GeneralRegs[ModRegRm.Register].Long
                            : (ULONG)State->GeneralRegs[ModRegRm.Register].LowWord;
 
    if (ModRegRm.Memory)
    {
        /*
         * For memory operands, add the bit offset divided by
         * the data size to the address
         */
        ModRegRm.MemoryAddress += (BitNumber / DataSize) * (DataSize / 8);
    }
 
    /* Normalize the bit number */
    BitNumber %= DataSize;
 
    if (OperandSize)
    {
        ULONG Value;
 
        /* Read the value */
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
 
        /* Set CF to the bit value */
        State->Flags.Cf = (Value >> BitNumber) & 1;
 
        /* Clear the bit */
        Value &= ~(1 << BitNumber);
 
        /* Write back the result */
        Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
    }
    else
    {
        USHORT Value;
 
        /* Read the value */
        if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
 
        /* Set CF to the bit value */
        State->Flags.Cf = (Value >> BitNumber) & 1;
 
        /* Clear the bit */
        Value &= ~(1 << BitNumber);
 
        /* Write back the result */
        Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
    }
}

FAST486_OPCODE_HANDLER() [8/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeBts

)

Definition at line 907 of file extraops.c.

{
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
    UINT DataSize;
    ULONG BitNumber;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the number of bits */
    if (OperandSize) DataSize = 32;
    else DataSize = 16;
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Get the bit number */
    BitNumber = OperandSize ? State->GeneralRegs[ModRegRm.Register].Long
                            : (ULONG)State->GeneralRegs[ModRegRm.Register].LowWord;
 
    if (ModRegRm.Memory)
    {
        /*
         * For memory operands, add the bit offset divided by
         * the data size to the address
         */
        ModRegRm.MemoryAddress += (BitNumber / DataSize) * (DataSize / 8);
    }
 
    /* Normalize the bit number */
    BitNumber %= DataSize;
 
    if (OperandSize)
    {
        ULONG Value;
 
        /* Read the value */
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
 
        /* Set CF to the bit value */
        State->Flags.Cf = (Value >> BitNumber) & 1;
 
        /* Set the bit */
        Value |= 1 << BitNumber;
 
        /* Write back the result */
        Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
    }
    else
    {
        USHORT Value;
 
        /* Read the value */
        if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
 
        /* Set CF to the bit value */
        State->Flags.Cf = (Value >> BitNumber) & 1;
 
        /* Set the bit */
        Value |= 1 << BitNumber;
 
        /* Write back the result */
        Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
    }
}

FAST486_OPCODE_HANDLER() [9/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeClts

)

Definition at line 493 of file extraops.c.

{
    NO_LOCK_PREFIX();
 
    /* The current privilege level must be zero */
    if (Fast486GetCurrentPrivLevel(State) != 0)
    {
        Fast486Exception(State, FAST486_EXCEPTION_GP);
        return;
    }
 
    /* Clear the task switch bit */
    State->ControlRegisters[FAST486_REG_CR0] &= ~FAST486_CR0_TS;
}

FAST486_OPCODE_HANDLER() [10/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeCmpXchg

)

Definition at line 1196 of file extraops.c.

{
    FAST486_MOD_REG_RM ModRegRm;
    BOOLEAN OperandSize, AddressSize;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
 
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    if (OperandSize)
    {
        ULONG Source, Destination, Result;
        ULONG Accumulator = State->GeneralRegs[FAST486_REG_EAX].Long;
 
        /* Read the operands */
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Source, &Destination))
        {
            /* Exception occurred */
            return;
        }
 
        /* Compare EAX with the destination */
        Result = Accumulator - Destination;
 
        /* Update the flags */
        State->Flags.Cf = (Accumulator < Destination);
        State->Flags.Of = ((Accumulator & SIGN_FLAG_LONG) != (Destination & SIGN_FLAG_LONG))
                          && ((Accumulator & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
        State->Flags.Af = (Accumulator & 0x0F) < (Destination & 0x0F);
        State->Flags.Zf = (Result == 0);
        State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
        State->Flags.Pf = Fast486CalculateParity(Result);
 
        if (State->Flags.Zf)
        {
            /* Load the source operand into the destination */
            Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Source);
        }
        else
        {
            /* Load the destination into EAX */
            State->GeneralRegs[FAST486_REG_EAX].Long = Destination;
        }
    }
    else
    {
        USHORT Source, Destination, Result;
        USHORT Accumulator = State->GeneralRegs[FAST486_REG_EAX].LowWord;
 
        /* Read the operands */
        if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Source, &Destination))
        {
            /* Exception occurred */
            return;
        }
 
        /* Compare AX with the destination */
        Result = Accumulator - Destination;
 
        /* Update the flags */
        State->Flags.Cf = (Accumulator < Destination);
        State->Flags.Of = ((Accumulator & SIGN_FLAG_WORD) != (Destination & SIGN_FLAG_WORD))
                          && ((Accumulator & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
        State->Flags.Af = (Accumulator & 0x0F) < (Destination & 0x0F);
        State->Flags.Zf = (Result == 0);
        State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
        State->Flags.Pf = Fast486CalculateParity(Result);
 
        if (State->Flags.Zf)
        {
            /* Load the source operand into the destination */
            Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Source);
        }
        else
        {
            /* Load the destination into AX */
            State->GeneralRegs[FAST486_REG_EAX].LowWord = Destination;
        }
    }
}

FAST486_OPCODE_HANDLER() [11/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeCmpXchgByte

)

Definition at line 1149 of file extraops.c.

{
    FAST486_MOD_REG_RM ModRegRm;
    UCHAR Accumulator = State->GeneralRegs[FAST486_REG_EAX].LowByte;
    UCHAR Source, Destination, Result;
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
 
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Read the operands */
    if (!Fast486ReadModrmByteOperands(State, &ModRegRm, &Source, &Destination))
    {
        /* Exception occurred */
        return;
    }
 
    /* Compare AL with the destination */
    Result = Accumulator - Destination;
 
    /* Update the flags */
    State->Flags.Cf = (Accumulator < Destination);
    State->Flags.Of = ((Accumulator & SIGN_FLAG_BYTE) != (Destination & SIGN_FLAG_BYTE))
                      && ((Accumulator & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
    State->Flags.Af = (Accumulator & 0x0F) < (Destination & 0x0F);
    State->Flags.Zf = (Result == 0);
    State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
    State->Flags.Pf = Fast486CalculateParity(Result);
 
    if (State->Flags.Zf)
    {
        /* Load the source operand into the destination */
        Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Source);
    }
    else
    {
        /* Load the destination into AL */
        State->GeneralRegs[FAST486_REG_EAX].LowByte = Destination;
    }
}

FAST486_OPCODE_HANDLER() [12/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeConditionalJmp

)

Definition at line 1845 of file extraops.c.

{
    BOOLEAN Jump = FALSE;
    LONG Offset = 0;
    BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
 
    TOGGLE_OPSIZE(Size);
    NO_LOCK_PREFIX();
 
    /* Make sure this is the right instruction */
    ASSERT((Opcode & 0xF0) == 0x80);
 
    /* Fetch the offset */
    if (Size)
    {
        if (!Fast486FetchDword(State, (PULONG)&Offset))
        {
            /* Exception occurred */
            return;
        }
    }
    else
    {
        SHORT Value;
 
        if (!Fast486FetchWord(State, (PUSHORT)&Value))
        {
            /* Exception occurred */
            return;
        }
 
        /* Sign-extend */
        Offset = (LONG)Value;
    }
 
    switch ((Opcode & 0x0F) >> 1)
    {
        /* JO / JNO */
        case 0:
        {
            Jump = State->Flags.Of;
            break;
        }
 
        /* JC / JNC */
        case 1:
        {
            Jump = State->Flags.Cf;
            break;
        }
 
        /* JZ / JNZ */
        case 2:
        {
            Jump = State->Flags.Zf;
            break;
        }
 
        /* JBE / JNBE */
        case 3:
        {
            Jump = State->Flags.Cf || State->Flags.Zf;
            break;
        }
 
        /* JS / JNS */
        case 4:
        {
            Jump = State->Flags.Sf;
            break;
        }
 
        /* JP / JNP */
        case 5:
        {
            Jump = State->Flags.Pf;
            break;
        }
 
        /* JL / JNL */
        case 6:
        {
            Jump = State->Flags.Sf != State->Flags.Of;
            break;
        }
 
        /* JLE / JNLE */
        case 7:
        {
            Jump = (State->Flags.Sf != State->Flags.Of) || State->Flags.Zf;
            break;
        }
    }
 
    if (Opcode & 1)
    {
        /* Invert the result */
        Jump = !Jump;
    }
 
    if (Jump)
    {
        /* Move the instruction pointer */
        State->InstPtr.Long += Offset;
    }
}

FAST486_OPCODE_HANDLER() [13/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeConditionalSet

)

Definition at line 1952 of file extraops.c.

{
    BOOLEAN Value = FALSE;
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    FAST486_MOD_REG_RM ModRegRm;
 
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Make sure this is the right instruction */
    ASSERT((Opcode & 0xF0) == 0x90);
 
    switch ((Opcode & 0x0F) >> 1)
    {
        /* SETO / SETNO */
        case 0:
        {
            Value = State->Flags.Of;
            break;
        }
 
        /* SETC / SETNC */
        case 1:
        {
            Value = State->Flags.Cf;
            break;
        }
 
        /* SETZ / SETNZ */
        case 2:
        {
            Value = State->Flags.Zf;
            break;
        }
 
        /* SETBE / SETNBE */
        case 3:
        {
            Value = State->Flags.Cf || State->Flags.Zf;
            break;
        }
 
        /* SETS / SETNS */
        case 4:
        {
            Value = State->Flags.Sf;
            break;
        }
 
        /* SETP / SETNP */
        case 5:
        {
            Value = State->Flags.Pf;
            break;
        }
 
        /* SETL / SETNL */
        case 6:
        {
            Value = State->Flags.Sf != State->Flags.Of;
            break;
        }
 
        /* SETLE / SETNLE */
        case 7:
        {
            Value = (State->Flags.Sf != State->Flags.Of) || State->Flags.Zf;
            break;
        }
    }
 
    if (Opcode & 1)
    {
        /* Invert the result */
        Value = !Value;
    }
 
    /* Write back the result */
    Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Value);
}

FAST486_OPCODE_HANDLER() [14/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeImul

)

Definition at line 1082 of file extraops.c.

{
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
 
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    if (OperandSize)
    {
        LONG Source, Destination;
        LONGLONG Result;
 
        /* Read the operands */
        if (!Fast486ReadModrmDwordOperands(State,
                                           &ModRegRm,
                                           (PULONG)&Destination,
                                           (PULONG)&Source))
        {
            /* Exception occurred */
            return;
        }
 
        /* Calculate the result */
        Result = (LONGLONG)Source * (LONGLONG)Destination;
 
        /* Update the flags */
        State->Flags.Cf = State->Flags.Of = ((Result < -2147483648LL) || (Result > 2147483647LL));
 
        /* Write back the result */
        Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, (ULONG)((LONG)Result));
    }
    else
    {
        SHORT Source, Destination;
        LONG Result;
 
        /* Read the operands */
        if (!Fast486ReadModrmWordOperands(State,
                                          &ModRegRm,
                                          (PUSHORT)&Destination,
                                          (PUSHORT)&Source))
        {
            /* Exception occurred */
            return;
        }
 
        /* Calculate the result */
        Result = (LONG)Source * (LONG)Destination;
 
        /* Update the flags */
        State->Flags.Cf = State->Flags.Of = ((Result < -32768) || (Result > 32767));
 
        /* Write back the result */
        Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, (USHORT)((SHORT)Result));
    }
}

FAST486_OPCODE_HANDLER() [15/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeInvalid

)

Definition at line 300 of file extraops.c.

{
    DPRINT1("FAST486 -- Extended opcode 0x%02X is INVALID!\n", Opcode);
    Fast486Exception(State, FAST486_EXCEPTION_UD);
    return;
}

FAST486_OPCODE_HANDLER() [16/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeLar

)

Definition at line 319 of file extraops.c.

{
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
    BOOLEAN Valid;
    USHORT Selector;
    FAST486_GDT_ENTRY GdtEntry;
    DWORD AccessRights;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
 
    if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
        || State->Flags.Vm)
    {
        /* Not recognized */
        Fast486Exception(State, FAST486_EXCEPTION_UD);
        return;
    }
 
    NO_LOCK_PREFIX();
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    if (OperandSize)
    {
        ULONG Value;
 
        /* Read the value */
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
 
        Selector = LOWORD(Value);
    }
    else
    {
        /* Read the value */
        if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Selector))
        {
            /* Exception occurred */
            return;
        }
    }
 
    if (!Fast486ReadDescriptorEntry(State, Selector, &Valid, &GdtEntry))
    {
        /* Exception occurred */
        return;
    }
 
    if (!Valid)
    {
        State->Flags.Zf = FALSE;
        return;
    }
 
    /* Privilege check */
    if (((GET_SEGMENT_RPL(Selector) > GdtEntry.Dpl))
        || (Fast486GetCurrentPrivLevel(State) > GdtEntry.Dpl))
    {
        State->Flags.Zf = FALSE;
        return;
    }
 
    /* Set ZF */
    State->Flags.Zf = TRUE;
 
    /* Get the access rights */
    AccessRights = ((PDWORD)&GdtEntry)[1] & 0x00F0FF00;
 
    /* Return the access rights */
    if (OperandSize) Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, AccessRights);
    else Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(AccessRights));
}

FAST486_OPCODE_HANDLER() [17/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeLfsLgs

)

Definition at line 1429 of file extraops.c.

{
    UCHAR FarPointer[6];
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
 
    /* Make sure this is the right instruction */
    ASSERT((Opcode & 0xFE) == 0xB4);
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
 
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    if (!ModRegRm.Memory)
    {
        /* Invalid */
        Fast486Exception(State, FAST486_EXCEPTION_UD);
        return;
    }
 
    if (!Fast486ReadMemory(State,
                           (State->PrefixFlags & FAST486_PREFIX_SEG)
                           ? State->SegmentOverride : FAST486_REG_DS,
                           ModRegRm.MemoryAddress,
                           FALSE,
                           FarPointer,
                           OperandSize ? 6 : 4))
    {
        /* Exception occurred */
        return;
    }
 
    if (OperandSize)
    {
        ULONG Offset = *((PULONG)FarPointer);
        USHORT Segment = *((PUSHORT)&FarPointer[sizeof(ULONG)]);
 
        /* Set the register to the offset */
        State->GeneralRegs[ModRegRm.Register].Long = Offset;
 
        /* Load the segment */
        Fast486LoadSegment(State,
                           (Opcode == 0xB4)
                           ? FAST486_REG_FS : FAST486_REG_GS,
                           Segment);
    }
    else
    {
        USHORT Offset = *((PUSHORT)FarPointer);
        USHORT Segment = *((PUSHORT)&FarPointer[sizeof(USHORT)]);
 
        /* Set the register to the offset */
        State->GeneralRegs[ModRegRm.Register].LowWord = Offset;
 
        /* Load the segment */
        Fast486LoadSegment(State,
                           (Opcode == 0xB4)
                           ? FAST486_REG_FS : FAST486_REG_GS,
                           Segment);
    }
}

FAST486_OPCODE_HANDLER() [18/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeLoadControlReg

)

Definition at line 586 of file extraops.c.

{
    ULONG Value;
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    FAST486_MOD_REG_RM ModRegRm;
 
    NO_LOCK_PREFIX();
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* The current privilege level must be zero */
    if (Fast486GetCurrentPrivLevel(State) != 0)
    {
        Fast486Exception(State, FAST486_EXCEPTION_GP);
        return;
    }
 
    if ((ModRegRm.Register == 1) || (ModRegRm.Register > 3))
    {
        /* CR1, CR4, CR5, CR6 and CR7 don't exist */
        Fast486Exception(State, FAST486_EXCEPTION_UD);
        return;
    }
 
    if (ModRegRm.Register != 0)
    {
        /* CR2 and CR3 and are stored in array indexes 1 and 2 */
        ModRegRm.Register--;
    }
 
    /* Get the value */
    Value = State->GeneralRegs[ModRegRm.SecondRegister].Long;
 
    if (ModRegRm.Register == (INT)FAST486_REG_CR0)
    {
        /* CR0 checks */
 
        if (((Value & (FAST486_CR0_PG | FAST486_CR0_PE)) == FAST486_CR0_PG)
            || ((Value & (FAST486_CR0_CD | FAST486_CR0_NW)) == FAST486_CR0_NW))
        {
            /* Invalid value */
            Fast486Exception(State, FAST486_EXCEPTION_GP);
            return;
        }
    }
 
#ifndef FAST486_NO_PREFETCH
    /* Changing CR0 or CR3 can interfere with prefetching (because of paging) */
    State->PrefetchValid = FALSE;
#endif
 
    if (ModRegRm.Register == (INT)FAST486_REG_CR3)
    {
        /* Flush the TLB */
        Fast486FlushTlb(State);
    }
 
    /* Load a value to the control register */
    State->ControlRegisters[ModRegRm.Register] = Value;
}

FAST486_OPCODE_HANDLER() [19/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeLoadDebugReg

)

Definition at line 653 of file extraops.c.

{
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    FAST486_MOD_REG_RM ModRegRm;
 
    NO_LOCK_PREFIX();
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* The current privilege level must be zero */
    if (Fast486GetCurrentPrivLevel(State) != 0)
    {
        Fast486Exception(State, FAST486_EXCEPTION_GP);
        return;
    }
 
    if ((ModRegRm.Register == 6) || (ModRegRm.Register == 7))
    {
        /* DR6 and DR7 are aliases to DR4 and DR5 */
        ModRegRm.Register -= 2;
    }
 
    if (State->DebugRegisters[FAST486_REG_DR5] & FAST486_DR5_GD)
    {
        /* Disallow access to debug registers */
        Fast486Exception(State, FAST486_EXCEPTION_GP);
        return;
    }
 
    /* Load a value to the debug register */
    State->DebugRegisters[ModRegRm.Register] = State->GeneralRegs[ModRegRm.SecondRegister].Long;
 
    if (ModRegRm.Register == (INT)FAST486_REG_DR4)
    {
        /* The reserved bits are 1 */
        State->DebugRegisters[ModRegRm.Register] |= FAST486_DR4_RESERVED;
    }
    else if (ModRegRm.Register == (INT)FAST486_REG_DR5)
    {
        /* The reserved bits are 0 */
        State->DebugRegisters[ModRegRm.Register] &= ~FAST486_DR5_RESERVED;
    }
}

FAST486_OPCODE_HANDLER() [20/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeLsl

)

Definition at line 403 of file extraops.c.

{
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
    BOOLEAN Valid;
    USHORT Selector;
    ULONG Limit;
    FAST486_GDT_ENTRY GdtEntry;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
 
    if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
        || State->Flags.Vm)
    {
        /* Not recognized */
        Fast486Exception(State, FAST486_EXCEPTION_UD);
        return;
    }
 
    NO_LOCK_PREFIX();
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    if (OperandSize)
    {
        ULONG Value;
 
        /* Read the value */
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
        {
            /* Exception occurred */
            return;
        }
 
        Selector = LOWORD(Value);
    }
    else
    {
        /* Read the value */
        if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Selector))
        {
            /* Exception occurred */
            return;
        }
    }
 
    if (!Fast486ReadDescriptorEntry(State, Selector, &Valid, &GdtEntry))
    {
        /* Exception occurred */
        return;
    }
 
    if (!Valid)
    {
        State->Flags.Zf = FALSE;
        return;
    }
 
    /* Privilege check */
    if (((GET_SEGMENT_RPL(Selector) > GdtEntry.Dpl))
        || (Fast486GetCurrentPrivLevel(State) > GdtEntry.Dpl))
    {
        State->Flags.Zf = FALSE;
        return;
    }
 
    /* Calculate the limit */
    Limit = GdtEntry.Limit | (GdtEntry.LimitHigh << 16);
 
    if (GdtEntry.Granularity)
    {
        Limit <<= 12;
        Limit |= 0x00000FFF;
    }
 
    /* Set ZF */
    State->Flags.Zf = TRUE;
 
    /* Return the limit */
    if (OperandSize) Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, Limit);
    else Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(Limit));
}

FAST486_OPCODE_HANDLER() [21/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeLss

)

Definition at line 1285 of file extraops.c.

{
    UCHAR FarPointer[6];
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
 
    /* Make sure this is the right instruction */
    ASSERT(Opcode == 0xB2);
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
 
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    if (!ModRegRm.Memory)
    {
        /* Invalid */
        Fast486Exception(State, FAST486_EXCEPTION_UD);
        return;
    }
 
    if (!Fast486ReadMemory(State,
                           (State->PrefixFlags & FAST486_PREFIX_SEG)
                           ? State->SegmentOverride : FAST486_REG_DS,
                           ModRegRm.MemoryAddress,
                           FALSE,
                           FarPointer,
                           OperandSize ? 6 : 4))
    {
        /* Exception occurred */
        return;
    }
 
    if (OperandSize)
    {
        ULONG Offset = *((PULONG)FarPointer);
        USHORT Segment = *((PUSHORT)&FarPointer[sizeof(ULONG)]);
 
        /* Set the register to the offset */
        State->GeneralRegs[ModRegRm.Register].Long = Offset;
 
        /* Load the segment */
        Fast486LoadSegment(State, FAST486_REG_SS, Segment);
    }
    else
    {
        USHORT Offset = *((PUSHORT)FarPointer);
        USHORT Segment = *((PUSHORT)&FarPointer[sizeof(USHORT)]);
 
        /* Set the register to the offset */
        State->GeneralRegs[ModRegRm.Register].LowWord = Offset;
 
        /* Load the segment */
        Fast486LoadSegment(State, FAST486_REG_SS, Segment);
    }
}

FAST486_OPCODE_HANDLER() [22/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeMovsxByte

)

Definition at line 1781 of file extraops.c.

{
    CHAR Value;
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    FAST486_MOD_REG_RM ModRegRm;
 
    TOGGLE_ADSIZE(AddressSize);
 
    /* Make sure this is the right instruction */
    ASSERT(Opcode == 0xBE);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Read the operands */
    if (!Fast486ReadModrmByteOperands(State, &ModRegRm, NULL, (PUCHAR)&Value))
    {
        /* Exception occurred */
        return;
    }
 
    /* Write back the sign-extended value */
    Fast486WriteModrmDwordOperands(State,
                                   &ModRegRm,
                                   TRUE,
                                   (ULONG)((LONG)Value));
}

FAST486_OPCODE_HANDLER() [23/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeMovsxWord

)

Definition at line 1813 of file extraops.c.

{
    SHORT Value;
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    FAST486_MOD_REG_RM ModRegRm;
 
    TOGGLE_ADSIZE(AddressSize);
 
    /* Make sure this is the right instruction */
    ASSERT(Opcode == 0xBF);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Read the operands */
    if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, (PUSHORT)&Value))
    {
        /* Exception occurred */
        return;
    }
 
    /* Write back the sign-extended value */
    Fast486WriteModrmDwordOperands(State,
                                   &ModRegRm,
                                   TRUE,
                                   (ULONG)((LONG)Value));
}

FAST486_OPCODE_HANDLER() [24/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeMovzxByte

)

Definition at line 1499 of file extraops.c.

{
    UCHAR Value;
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    FAST486_MOD_REG_RM ModRegRm;
 
    TOGGLE_ADSIZE(AddressSize);
 
    /* Make sure this is the right instruction */
    ASSERT(Opcode == 0xB6);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Read the operands */
    if (!Fast486ReadModrmByteOperands(State, &ModRegRm, NULL, &Value))
    {
        /* Exception occurred */
        return;
    }
 
    /* Write back the zero-extended value */
    Fast486WriteModrmDwordOperands(State,
                                   &ModRegRm,
                                   TRUE,
                                   (ULONG)Value);
}

FAST486_OPCODE_HANDLER() [25/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeMovzxWord

)

Definition at line 1531 of file extraops.c.

{
    USHORT Value;
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    FAST486_MOD_REG_RM ModRegRm;
 
    TOGGLE_ADSIZE(AddressSize);
 
    /* Make sure this is the right instruction */
    ASSERT(Opcode == 0xB7);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Read the operands */
    if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
    {
        /* Exception occurred */
        return;
    }
 
    /* Write back the zero-extended value */
    Fast486WriteModrmDwordOperands(State,
                                   &ModRegRm,
                                   TRUE,
                                   (ULONG)Value);
}

FAST486_OPCODE_HANDLER() [26/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodePopFs

)

Definition at line 709 of file extraops.c.

{
    ULONG NewSelector;
 
    if (!Fast486StackPop(State, &NewSelector))
    {
        /* Exception occurred */
        return;
    }
 
    /* Call the internal API */
    Fast486LoadSegment(State, FAST486_REG_FS, LOWORD(NewSelector));
}

FAST486_OPCODE_HANDLER() [27/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodePopGs

)

Definition at line 893 of file extraops.c.

{
    ULONG NewSelector;
 
    if (!Fast486StackPop(State, &NewSelector))
    {
        /* Exception occurred */
        return;
    }
 
    /* Call the internal API */
    Fast486LoadSegment(State, FAST486_REG_GS, LOWORD(NewSelector));
}

FAST486_OPCODE_HANDLER() [28/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodePushFs

)

Definition at line 703 of file extraops.c.

{
    /* Call the internal API */
    Fast486StackPush(State, State->SegmentRegs[FAST486_REG_FS].Selector);
}

FAST486_OPCODE_HANDLER() [29/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodePushGs

)

Definition at line 887 of file extraops.c.

{
    /* Call the internal API */
    Fast486StackPush(State, State->SegmentRegs[FAST486_REG_GS].Selector);
}

FAST486_OPCODE_HANDLER() [30/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeShld

)

Definition at line 791 of file extraops.c.

{
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
    UCHAR Count;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Make sure this is the right instruction */
    ASSERT((Opcode & 0xFE) == 0xA4);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    if (Opcode == 0xA4)
    {
        /* Fetch the count */
        if (!Fast486FetchByte(State, &Count))
        {
            /* Exception occurred */
            return;
        }
    }
    else
    {
        /* The count is in CL */
        Count = State->GeneralRegs[FAST486_REG_ECX].LowByte;
    }
 
    /* Normalize the count */
    Count &= 0x1F;
 
    /* Do nothing if the count is zero */
    if (Count == 0) return;
 
    if (OperandSize)
    {
        ULONG Source, Destination, Result;
 
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Source, &Destination))
        {
            /* Exception occurred */
            return;
        }
 
        /* Calculate the result */
        Result = (Destination << Count) | (Source >> (32 - Count));
 
        /* Update flags */
        State->Flags.Cf = (Destination >> (32 - Count)) & 1;
        if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_LONG)
                                          != (Destination & SIGN_FLAG_LONG);
        State->Flags.Zf = (Result == 0);
        State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
        State->Flags.Pf = Fast486CalculateParity(Result);
 
        /* Write back the result */
        Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result);
    }
    else
    {
        USHORT Source, Destination, Result;
        ULONG DoubleSource;
 
        if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Source, &Destination))
        {
            /* Exception occurred */
            return;
        }
 
        DoubleSource = Source | (Source << 16);
 
        /* Calculate the result */
        Result = (Destination << Count) | (DoubleSource >> (32 - Count));
 
        /* Update flags */
        if (Count <= 16) State->Flags.Cf = (Destination >> (16 - Count)) & 1;
        else  State->Flags.Cf = (Source >> (32 - Count)) & 1;
 
        if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_WORD)
                                          != (Destination & SIGN_FLAG_WORD);
        State->Flags.Zf = (Result == 0);
        State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
        State->Flags.Pf = Fast486CalculateParity(Result);
 
        /* Write back the result */
        Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Result);
    }
}

FAST486_OPCODE_HANDLER() [31/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeShrd

)

Definition at line 987 of file extraops.c.

{
    BOOLEAN OperandSize, AddressSize;
    FAST486_MOD_REG_RM ModRegRm;
    UCHAR Count;
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    TOGGLE_OPSIZE(OperandSize);
    TOGGLE_ADSIZE(AddressSize);
 
    /* Make sure this is the right instruction */
    ASSERT((Opcode & 0xFE) == 0xAC);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    if (Opcode == 0xAC)
    {
        /* Fetch the count */
        if (!Fast486FetchByte(State, &Count))
        {
            /* Exception occurred */
            return;
        }
    }
    else
    {
        /* The count is in CL */
        Count = State->GeneralRegs[FAST486_REG_ECX].LowByte;
    }
 
    /* Normalize the count */
    Count &= 0x1F;
 
    /* Do nothing if the count is zero */
    if (Count == 0) return;
 
    if (OperandSize)
    {
        ULONG Source, Destination, Result;
 
        if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Source, &Destination))
        {
            /* Exception occurred */
            return;
        }
 
        /* Calculate the result */
        Result = (Destination >> Count) | (Source << (32 - Count));
 
        /* Update flags */
        State->Flags.Cf = (Destination >> (Count - 1)) & 1;
        if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_LONG)
                                          != (Destination & SIGN_FLAG_LONG);
        State->Flags.Zf = (Result == 0);
        State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
        State->Flags.Pf = Fast486CalculateParity(Result);
 
        /* Write back the result */
        Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result);
    }
    else
    {
        USHORT Source, Destination, Result;
 
        if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Source, &Destination))
        {
            /* Exception occurred */
            return;
        }
 
        /* Calculate the result */
        Result = (Destination >> Count) | (Source << (16 - Count));
 
        if (Count >= 16) Result |= (ULONG)(Source | (Source << 16)) >> (Count - 16);
 
        /* Update flags */
        if (Count <= 16) State->Flags.Cf = (Destination >> (Count - 1)) & 1;
        else State->Flags.Cf = (Source >> (Count - 17)) & 1;
 
        if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_WORD)
                                          != (Destination & SIGN_FLAG_WORD);
        State->Flags.Zf = (Result == 0);
        State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
        State->Flags.Pf = Fast486CalculateParity(Result);
 
        /* Write back the result */
        Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Result);
    }
}

FAST486_OPCODE_HANDLER() [32/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeStoreControlReg

)

Definition at line 508 of file extraops.c.

{
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    FAST486_MOD_REG_RM ModRegRm;
 
    NO_LOCK_PREFIX();
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* The current privilege level must be zero */
    if (Fast486GetCurrentPrivLevel(State) != 0)
    {
        Fast486Exception(State, FAST486_EXCEPTION_GP);
        return;
    }
 
    if ((ModRegRm.Register == 1) || (ModRegRm.Register > 3))
    {
        /* CR1, CR4, CR5, CR6 and CR7 don't exist */
        Fast486Exception(State, FAST486_EXCEPTION_UD);
        return;
    }
 
    if (ModRegRm.Register != 0)
    {
        /* CR2 and CR3 and are stored in array indexes 1 and 2 */
        ModRegRm.Register--;
    }
 
    /* Store the value of the control register */
    State->GeneralRegs[ModRegRm.SecondRegister].Long = State->ControlRegisters[ModRegRm.Register];
}

FAST486_OPCODE_HANDLER() [33/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeStoreDebugReg

)

Definition at line 547 of file extraops.c.

{
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
    FAST486_MOD_REG_RM ModRegRm;
 
    NO_LOCK_PREFIX();
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* The current privilege level must be zero */
    if (Fast486GetCurrentPrivLevel(State) != 0)
    {
        Fast486Exception(State, FAST486_EXCEPTION_GP);
        return;
    }
 
    if ((ModRegRm.Register == 6) || (ModRegRm.Register == 7))
    {
        /* DR6 and DR7 are aliases to DR4 and DR5 */
        ModRegRm.Register -= 2;
    }
 
    if (State->DebugRegisters[FAST486_REG_DR5] & FAST486_DR5_GD)
    {
        /* Disallow access to debug registers */
        Fast486Exception(State, FAST486_EXCEPTION_GP);
        return;
    }
 
    /* Store the value of the debug register */
    State->GeneralRegs[ModRegRm.SecondRegister].Long = State->DebugRegisters[ModRegRm.Register];
}

FAST486_OPCODE_HANDLER() [34/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeUnimplemented

)

Definition at line 307 of file extraops.c.

{
    DPRINT1("FAST486 -- Extended opcode 0x%02X is UNIMPLEMENTED\n", Opcode);
    // Fast486Exception(State, FAST486_EXCEPTION_UD);
}

FAST486_OPCODE_HANDLER() [35/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeXadd

)

Definition at line 2089 of file extraops.c.

{
    FAST486_MOD_REG_RM ModRegRm;
    BOOLEAN OperandSize, AddressSize;
 
    /* Make sure this is the right instruction */
    ASSERT(Opcode == 0xC1);
 
    OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
 
    TOGGLE_ADSIZE(AddressSize);
    TOGGLE_OPSIZE(OperandSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    /* Check the operand size */
    if (OperandSize)
    {
        ULONG Source, Destination, Result;
 
        if (!Fast486ReadModrmDwordOperands(State,
                                           &ModRegRm,
                                           &Source,
                                           &Destination))
        {
            /* Exception occurred */
            return;
        }
 
        /* Calculate the result */
        Result = Source + Destination;
 
        /* Update the flags */
        State->Flags.Cf = (Result < Source) && (Result < Destination);
        State->Flags.Of = ((Source & SIGN_FLAG_LONG) == (Destination & SIGN_FLAG_LONG))
                          && ((Source & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
        State->Flags.Af = ((((Source & 0x0F) + (Destination & 0x0F)) & 0x10) != 0);
        State->Flags.Zf = (Result == 0);
        State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
        State->Flags.Pf = Fast486CalculateParity(Result);
 
        /* Write the old value of the destination to the source */
        if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, Destination))
        {
            /* Exception occurred */
            return;
        }
 
        /* Write the sum to the destination */
        Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result);
    }
    else
    {
        USHORT Source, Destination, Result;
 
        if (!Fast486ReadModrmWordOperands(State,
                                          &ModRegRm,
                                          &Source,
                                          &Destination))
        {
            /* Exception occurred */
            return;
        }
 
        /* Calculate the result */
        Result = Source + Destination;
 
        /* Update the flags */
        State->Flags.Cf = (Result < Source) && (Result < Destination);
        State->Flags.Of = ((Source & SIGN_FLAG_WORD) == (Destination & SIGN_FLAG_WORD))
                          && ((Source & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
        State->Flags.Af = ((((Source & 0x0F) + (Destination & 0x0F)) & 0x10) != 0);
        State->Flags.Zf = (Result == 0);
        State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
        State->Flags.Pf = Fast486CalculateParity(Result);
 
        /* Write the old value of the destination to the source */
        if (!Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, Destination))
        {
            /* Exception occurred */
            return;
        }
 
        /* Write the sum to the destination */
        Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Result);
    }
}

FAST486_OPCODE_HANDLER() [36/37]

FAST486_OPCODE_HANDLER

(

Fast486ExtOpcodeXaddByte

)

Definition at line 2039 of file extraops.c.

{
    UCHAR Source, Destination, Result;
    FAST486_MOD_REG_RM ModRegRm;
    BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
 
    /* Make sure this is the right instruction */
    ASSERT(Opcode == 0xC0);
 
    TOGGLE_ADSIZE(AddressSize);
 
    /* Get the operands */
    if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
    {
        /* Exception occurred */
        return;
    }
 
    if (!Fast486ReadModrmByteOperands(State,
                                      &ModRegRm,
                                      &Source,
                                      &Destination))
    {
        /* Exception occurred */
        return;
    }
 
    /* Calculate the result */
    Result = Source + Destination;
 
    /* Update the flags */
    State->Flags.Cf = (Result < Source) && (Result < Destination);
    State->Flags.Of = ((Source & SIGN_FLAG_BYTE) == (Destination & SIGN_FLAG_BYTE))
                      && ((Source & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
    State->Flags.Af = ((((Source & 0x0F) + (Destination & 0x0F)) & 0x10) != 0);
    State->Flags.Zf = (Result == 0);
    State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
    State->Flags.Pf = Fast486CalculateParity(Result);
 
    /* Write the sum to the destination */
    if (!Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Result))
    {
        /* Exception occurred */
        return;
    }
 
    /* Write the old value of the destination to the source */
    Fast486WriteModrmByteOperands(State, &ModRegRm, TRUE, Destination);
}

FAST486_OPCODE_HANDLER() [37/37]

FAST486_OPCODE_HANDLER

(

Fast486OpcodeExtended

)

Definition at line 2196 of file extraops.c.

{
    UCHAR SecondOpcode;
 
    /* Fetch the second operation code */
    if (!Fast486FetchByte(State, &SecondOpcode))
    {
        /* Exception occurred */
        return;
    }
 
    /* Call the extended opcode handler */
    Fast486ExtendedHandlers[SecondOpcode](State, SecondOpcode);
}