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[FAST486]
Implement the XADD instruction. svn path=/branches/ntvdm/; revision=60819
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5c220ef022
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@ -229,8 +229,8 @@ Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
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NULL, // TODO: OPCODE 0xBD NOT IMPLEMENTED
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NULL, // TODO: OPCODE 0xBD NOT IMPLEMENTED
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NULL, // TODO: OPCODE 0xBE NOT IMPLEMENTED
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NULL, // TODO: OPCODE 0xBE NOT IMPLEMENTED
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NULL, // TODO: OPCODE 0xBF NOT IMPLEMENTED
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NULL, // TODO: OPCODE 0xBF NOT IMPLEMENTED
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NULL, // TODO: OPCODE 0xC0 NOT IMPLEMENTED
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Fast486ExtOpcodeXaddByte,
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NULL, // TODO: OPCODE 0xC1 NOT IMPLEMENTED
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Fast486ExtOpcodeXadd,
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NULL, // Invalid
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NULL, // Invalid
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NULL, // Invalid
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NULL, // Invalid
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NULL, // Invalid
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NULL, // Invalid
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@ -1233,6 +1233,165 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalSet)
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return Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Value);
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return Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Value);
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}
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}
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXaddByte)
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{
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UCHAR Source, Destination, Result;
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FAST486_MOD_REG_RM ModRegRm;
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BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
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/* Make sure this is the right instruction */
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ASSERT(Opcode == 0xC0);
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TOGGLE_ADSIZE(AddressSize);
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/* Get the operands */
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if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
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{
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/* Exception occurred */
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return FALSE;
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}
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if (!Fast486ReadModrmByteOperands(State,
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&ModRegRm,
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&Source,
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&Destination))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Calculate the result */
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Result = Source + Destination;
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/* Update the flags */
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State->Flags.Cf = (Result < Source) && (Result < Destination);
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State->Flags.Of = ((Source & SIGN_FLAG_BYTE) == (Destination & SIGN_FLAG_BYTE))
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&& ((Source & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
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State->Flags.Af = (((Source & 0x0F) + (Destination & 0x0F)) & 0x10) ? TRUE : FALSE;
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State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
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State->Flags.Sf = (Result & SIGN_FLAG_BYTE) ? TRUE : FALSE;
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State->Flags.Pf = Fast486CalculateParity(Result);
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/* Write the sum to the destination */
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if (!Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Result))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Write the old value of the destination to the source */
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if (!Fast486WriteModrmByteOperands(State, &ModRegRm, TRUE, Destination))
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{
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/* Exception occurred */
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return FALSE;
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}
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return TRUE;
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}
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXadd)
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{
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FAST486_MOD_REG_RM ModRegRm;
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BOOLEAN OperandSize, AddressSize;
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/* Make sure this is the right instruction */
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ASSERT(Opcode == 0xC1);
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OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
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TOGGLE_ADSIZE(AddressSize);
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TOGGLE_OPSIZE(OperandSize);
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/* Get the operands */
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if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Check the operand size */
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if (OperandSize)
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{
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ULONG Source, Destination, Result;
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if (!Fast486ReadModrmDwordOperands(State,
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&ModRegRm,
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&Source,
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&Destination))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Calculate the result */
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Result = Source + Destination;
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/* Update the flags */
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State->Flags.Cf = (Result < Source) && (Result < Destination);
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State->Flags.Of = ((Source & SIGN_FLAG_LONG) == (Destination & SIGN_FLAG_LONG))
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&& ((Source & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
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State->Flags.Af = (((Source & 0x0F) + (Destination & 0x0F)) & 0x10) ? TRUE : FALSE;
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State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
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State->Flags.Sf = (Result & SIGN_FLAG_LONG) ? TRUE : FALSE;
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State->Flags.Pf = Fast486CalculateParity(Result);
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/* Write the sum to the destination */
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if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Write the old value of the destination to the source */
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if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, Destination))
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{
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/* Exception occurred */
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return FALSE;
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}
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}
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else
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{
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USHORT Source, Destination, Result;
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if (!Fast486ReadModrmWordOperands(State,
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&ModRegRm,
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&Source,
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&Destination))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Calculate the result */
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Result = Source + Destination;
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/* Update the flags */
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State->Flags.Cf = (Result < Source) && (Result < Destination);
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State->Flags.Of = ((Source & SIGN_FLAG_WORD) == (Destination & SIGN_FLAG_WORD))
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&& ((Source & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
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State->Flags.Af = (((Source & 0x0F) + (Destination & 0x0F)) & 0x10) ? TRUE : FALSE;
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State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
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State->Flags.Sf = (Result & SIGN_FLAG_WORD) ? TRUE : FALSE;
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State->Flags.Pf = Fast486CalculateParity(Result);
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/* Write the sum to the destination */
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if (!Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Result))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Write the old value of the destination to the source */
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if (!Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, Destination))
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{
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/* Exception occurred */
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return FALSE;
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}
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}
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return TRUE;
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}
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBswap)
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBswap)
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{
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{
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PUCHAR Pointer;
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PUCHAR Pointer;
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@ -43,6 +43,8 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtr);
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtc);
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtc);
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalJmp);
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalJmp);
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalSet);
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalSet);
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXaddByte);
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXadd);
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBswap);
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FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBswap);
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FAST486_OPCODE_HANDLER(Fast486OpcodeExtended);
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FAST486_OPCODE_HANDLER(Fast486OpcodeExtended);
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