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1562 lines
43 KiB
C
1562 lines
43 KiB
C
/*
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* Soft386 386/486 CPU Emulation Library
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* opgroups.c
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*
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* Copyright (C) 2013 Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/* INCLUDES *******************************************************************/
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// #define WIN32_NO_STATUS
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// #define _INC_WINDOWS
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#include <windef.h>
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// #define NDEBUG
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#include <debug.h>
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#include <soft386.h>
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#include "opcodes.h"
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#include "common.h"
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/* PRIVATE FUNCTIONS **********************************************************/
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inline
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static
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ULONG
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Soft386ArithmeticOperation(PSOFT386_STATE State,
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INT Operation,
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ULONG FirstValue,
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ULONG SecondValue,
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UCHAR Bits)
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{
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ULONG Result;
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ULONG SignFlag = 1 << (Bits - 1);
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ULONG MaxValue = (1 << Bits) - 1;
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/* Make sure the values don't exceed the maximum for their size */
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FirstValue &= MaxValue;
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SecondValue &= MaxValue;
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/* Check which operation is this */
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switch (Operation)
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{
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/* ADD */
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case 0:
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{
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Result = (FirstValue + SecondValue) & MaxValue;
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/* Update CF, OF and AF */
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State->Flags.Cf = (Result < FirstValue) && (Result < SecondValue);
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State->Flags.Of = ((FirstValue & SignFlag) == (SecondValue & SignFlag))
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&& ((FirstValue & SignFlag) != (Result & SignFlag));
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State->Flags.Af = (((FirstValue & 0x0F) + (SecondValue & 0x0F)) & 0x10) ? TRUE : FALSE;
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break;
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}
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/* OR */
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case 1:
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{
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Result = FirstValue | SecondValue;
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break;
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}
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/* ADC */
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case 2:
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{
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INT Carry = State->Flags.Cf ? 1 : 0;
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Result = (FirstValue + SecondValue + Carry) & MaxValue;
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/* Update CF, OF and AF */
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State->Flags.Cf = ((SecondValue == MaxValue) && (Carry == 1))
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|| ((Result < FirstValue) && (Result < (SecondValue + Carry)));
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State->Flags.Of = ((FirstValue & SignFlag) == (SecondValue & SignFlag))
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&& ((FirstValue & SignFlag) != (Result & SignFlag));
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State->Flags.Af = (((FirstValue & 0x0F) + ((SecondValue + Carry) & 0x0F)) & 0x10)
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? TRUE : FALSE;
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break;
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}
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/* SBB */
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case 3:
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{
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INT Carry = State->Flags.Cf ? 1 : 0;
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Result = (FirstValue - SecondValue - Carry) & MaxValue;
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/* Update CF, OF and AF */
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State->Flags.Cf = FirstValue < (SecondValue + Carry);
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State->Flags.Of = ((FirstValue & SignFlag) != (SecondValue & SignFlag))
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&& ((FirstValue & SignFlag) != (Result & SignFlag));
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State->Flags.Af = (FirstValue & 0x0F) < ((SecondValue + Carry) & 0x0F);
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break;
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}
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/* AND */
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case 4:
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{
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Result = FirstValue & SecondValue;
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break;
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}
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/* SUB or CMP */
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case 5:
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case 7:
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{
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Result = (FirstValue - SecondValue) & MaxValue;
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/* Update CF, OF and AF */
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State->Flags.Cf = FirstValue < SecondValue;
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State->Flags.Of = ((FirstValue & SignFlag) != (SecondValue & SignFlag))
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&& ((FirstValue & SignFlag) != (Result & SignFlag));
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State->Flags.Af = (FirstValue & 0x0F) < (SecondValue & 0x0F);
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break;
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}
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/* XOR */
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case 6:
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{
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Result = FirstValue ^ SecondValue;
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break;
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}
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default:
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{
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/* Shouldn't happen */
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ASSERT(FALSE);
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}
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}
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/* Update ZF, SF and PF */
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State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
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State->Flags.Sf = (Result & SignFlag) ? TRUE : FALSE;
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State->Flags.Pf = Soft386CalculateParity(LOBYTE(Result));
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/* Return the result */
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return Result;
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}
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static
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inline
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ULONG
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Soft386RotateOperation(PSOFT386_STATE State,
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INT Operation,
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ULONG Value,
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UCHAR Bits,
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UCHAR Count)
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{
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ULONG HighestBit = 1 << (Bits - 1);
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ULONG Result;
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if ((Operation != 2) && (Operation != 3))
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{
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/* Mask the count */
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Count &= Bits - 1;
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}
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else
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{
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/* For RCL and RCR, the CF is included in the value */
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Count %= Bits + 1;
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}
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/* Check which operation is this */
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switch (Operation)
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{
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/* ROL */
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case 0:
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{
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Result = (Value << Count) | (Value >> (Bits - Count));
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/* Update CF and OF */
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State->Flags.Cf = Result & 1;
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if (Count == 1) State->Flags.Of = ((Result & HighestBit) ? TRUE : FALSE)
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^ State->Flags.Cf;
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break;
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}
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/* ROR */
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case 1:
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{
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Result = (Value >> Count) | (Value << (Bits - Count));
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/* Update CF and OF */
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State->Flags.Cf = (Result & HighestBit) ? TRUE : FALSE;
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if (Count == 1) State->Flags.Of = State->Flags.Cf
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^ ((Result & (HighestBit >> 1))
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? TRUE : FALSE);
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break;
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}
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/* RCL */
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case 2:
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{
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Result = (Value << Count)
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| (State->Flags.Cf << (Count - 1))
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| (Value >> (Bits - Count + 1));
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/* Update CF and OF */
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State->Flags.Cf = (Value & (1 << (Bits - Count))) ? TRUE : FALSE;
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if (Count == 1) State->Flags.Of = ((Result & HighestBit) ? TRUE : FALSE)
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^ State->Flags.Cf;
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break;
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}
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/* RCR */
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case 3:
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{
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Result = (Value >> Count)
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| (State->Flags.Cf << (Bits - Count))
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| (Value << (Bits - Count + 1));
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/* Update CF and OF */
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State->Flags.Cf = (Value & (1 << (Bits - Count))) ? TRUE : FALSE;
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if (Count == 1) State->Flags.Of = State->Flags.Cf
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^ ((Result & (HighestBit >> 1))
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? TRUE : FALSE);
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break;
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}
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/* SHL/SAL */
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case 4:
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case 6:
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{
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Result = Value << Count;
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/* Update CF and OF */
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State->Flags.Cf = (Value & (1 << (Bits - Count))) ? TRUE : FALSE;
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if (Count == 1) State->Flags.Of = ((Result & HighestBit) ? TRUE : FALSE)
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^ (State->Flags.Cf ? TRUE : FALSE);
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break;
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}
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/* SHR */
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case 5:
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{
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Result = Value >> Count;
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/* Update CF and OF */
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State->Flags.Cf = (Value & (1 << (Count - 1))) ? TRUE : FALSE;
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if (Count == 1) State->Flags.Of = (Value & HighestBit) ? TRUE : FALSE;
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break;
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}
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/* SAR */
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case 7:
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{
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Result = Value >> Count;
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/* Fill the top Count bits with the sign bit */
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if (Value & HighestBit) Result |= ((1 << Count) - 1) << (Bits - Count);
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/* Update CF and OF */
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State->Flags.Cf = Value & 1;
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if (Count == 1) State->Flags.Of = FALSE;
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break;
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}
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}
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/* Update ZF, SF and PF */
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State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
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State->Flags.Sf = (Result & HighestBit) ? TRUE : FALSE;
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State->Flags.Pf = Soft386CalculateParity(Result);
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/* Return the result */
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return Result;
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}
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/* PUBLIC FUNCTIONS ***********************************************************/
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SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup8082)
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{
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UCHAR Immediate, Dummy, Value;
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SOFT386_MOD_REG_RM ModRegRm;
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BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
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if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
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{
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/* The ADSIZE prefix toggles the size */
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AddressSize = !AddressSize;
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}
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if (!Soft386ParseModRegRm(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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/* Fetch the immediate operand */
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if (!Soft386FetchByte(State, &Immediate))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Read the operands */
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if (!Soft386ReadModrmByteOperands(State, &ModRegRm, &Dummy, &Value))
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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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Value = Soft386ArithmeticOperation(State, ModRegRm.Register, Value, Immediate, 8);
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/* Unless this is CMP, write back the result */
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if (ModRegRm.Register != 7)
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{
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return Soft386WriteModrmByteOperands(State, &ModRegRm, FALSE, Value);
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}
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return TRUE;
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}
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SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup81)
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{
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SOFT386_MOD_REG_RM ModRegRm;
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BOOLEAN OperandSize, AddressSize;
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OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
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if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
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{
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/* The OPSIZE prefix toggles the size */
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OperandSize = !OperandSize;
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}
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if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
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{
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/* The ADSIZE prefix toggles the size */
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AddressSize = !AddressSize;
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}
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if (!Soft386ParseModRegRm(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 (OperandSize)
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{
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ULONG Immediate, Value, Dummy;
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/* Fetch the immediate operand */
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if (!Soft386FetchDword(State, &Immediate))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Read the operands */
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if (!Soft386ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value))
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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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Value = Soft386ArithmeticOperation(State, ModRegRm.Register, Value, Immediate, 32);
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/* Unless this is CMP, write back the result */
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if (ModRegRm.Register != 7)
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{
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return Soft386WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
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}
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}
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else
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{
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USHORT Immediate, Value, Dummy;
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/* Fetch the immediate operand */
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if (!Soft386FetchWord(State, &Immediate))
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{
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/* Exception occurred */
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return FALSE;
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}
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/* Read the operands */
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if (!Soft386ReadModrmWordOperands(State, &ModRegRm, &Dummy, &Value))
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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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Value = Soft386ArithmeticOperation(State, ModRegRm.Register, Value, Immediate, 16);
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/* Unless this is CMP, write back the result */
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if (ModRegRm.Register != 7)
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{
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return Soft386WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
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}
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}
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return TRUE;
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}
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SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup83)
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{
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CHAR ImmByte;
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SOFT386_MOD_REG_RM ModRegRm;
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BOOLEAN OperandSize, AddressSize;
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OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
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if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
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{
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/* The OPSIZE prefix toggles the size */
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OperandSize = !OperandSize;
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}
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if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
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{
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/* The ADSIZE prefix toggles the size */
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AddressSize = !AddressSize;
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}
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if (!Soft386ParseModRegRm(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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/* Fetch the immediate operand */
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if (!Soft386FetchByte(State, (PUCHAR)&ImmByte))
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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 (OperandSize)
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{
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ULONG Immediate = (ULONG)((LONG)ImmByte); // Sign extend
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ULONG Value, Dummy;
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/* Read the operands */
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if (!Soft386ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value))
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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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Value = Soft386ArithmeticOperation(State, ModRegRm.Register, Value, Immediate, 32);
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/* Unless this is CMP, write back the result */
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if (ModRegRm.Register != 7)
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{
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return Soft386WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
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}
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}
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else
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{
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USHORT Immediate = (USHORT)((SHORT)ImmByte); // Sign extend
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USHORT Value, Dummy;
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|
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/* Read the operands */
|
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if (!Soft386ReadModrmWordOperands(State, &ModRegRm, &Dummy, &Value))
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{
|
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/* Exception occurred */
|
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return FALSE;
|
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}
|
|
|
|
/* Calculate the result */
|
|
Value = Soft386ArithmeticOperation(State, ModRegRm.Register, Value, Immediate, 16);
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|
|
|
/* Unless this is CMP, write back the result */
|
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if (ModRegRm.Register != 7)
|
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{
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return Soft386WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
|
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}
|
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}
|
|
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return TRUE;
|
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}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroup8F)
|
|
{
|
|
ULONG Value;
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
|
|
{
|
|
/* The OPSIZE prefix toggles the size */
|
|
OperandSize = !OperandSize;
|
|
}
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register != 0)
|
|
{
|
|
/* Invalid */
|
|
Soft386Exception(State, SOFT386_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Pop a value from the stack */
|
|
if (!Soft386StackPop(State, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
return Soft386WriteModrmDwordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
else
|
|
{
|
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return Soft386WriteModrmWordOperands(State,
|
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&ModRegRm,
|
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FALSE,
|
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LOWORD(Value));
|
|
}
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupC0)
|
|
{
|
|
UCHAR Dummy, Value, Count;
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Fetch the count */
|
|
if (!Soft386FetchByte(State, &Count))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmByteOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOBYTE(Soft386RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
8,
|
|
Count));
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmByteOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupC1)
|
|
{
|
|
UCHAR Count;
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
|
|
{
|
|
/* The OPSIZE prefix toggles the size */
|
|
OperandSize = !OperandSize;
|
|
}
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Fetch the count */
|
|
if (!Soft386FetchByte(State, &Count))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
ULONG Dummy, Value;
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = Soft386RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
32,
|
|
Count);
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
else
|
|
{
|
|
USHORT Dummy, Value;
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmWordOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOWORD(Soft386RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
16,
|
|
Count));
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupC6)
|
|
{
|
|
UCHAR Immediate;
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register != 0)
|
|
{
|
|
/* Invalid */
|
|
Soft386Exception(State, SOFT386_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Get the immediate operand */
|
|
if (!Soft386FetchByte(State, &Immediate))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
return Soft386WriteModrmByteOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Immediate);
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupC7)
|
|
{
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
|
|
{
|
|
/* The OPSIZE prefix toggles the size */
|
|
OperandSize = !OperandSize;
|
|
}
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register != 0)
|
|
{
|
|
/* Invalid */
|
|
Soft386Exception(State, SOFT386_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
ULONG Immediate;
|
|
|
|
/* Get the immediate operand */
|
|
if (!Soft386FetchDword(State, &Immediate))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
return Soft386WriteModrmDwordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Immediate);
|
|
}
|
|
else
|
|
{
|
|
USHORT Immediate;
|
|
|
|
/* Get the immediate operand */
|
|
if (!Soft386FetchWord(State, &Immediate))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
return Soft386WriteModrmWordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Immediate);
|
|
}
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupD0)
|
|
{
|
|
UCHAR Dummy, Value;
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmByteOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOBYTE(Soft386RotateOperation(State, ModRegRm.Register, Value, 8, 1));
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmByteOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupD1)
|
|
{
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
|
|
{
|
|
/* The OPSIZE prefix toggles the size */
|
|
OperandSize = !OperandSize;
|
|
}
|
|
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
ULONG Dummy, Value;
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = Soft386RotateOperation(State, ModRegRm.Register, Value, 32, 1);
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
else
|
|
{
|
|
USHORT Dummy, Value;
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmWordOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOWORD(Soft386RotateOperation(State, ModRegRm.Register, Value, 16, 1));
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupD2)
|
|
{
|
|
UCHAR Dummy, Value;
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmByteOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOBYTE(Soft386RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
8,
|
|
State->GeneralRegs[SOFT386_REG_ECX].LowByte));
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmByteOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupD3)
|
|
{
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
|
|
{
|
|
/* The OPSIZE prefix toggles the size */
|
|
OperandSize = !OperandSize;
|
|
}
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
ULONG Dummy, Value;
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = Soft386RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
32,
|
|
State->GeneralRegs[SOFT386_REG_ECX].LowByte);
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
else
|
|
{
|
|
USHORT Dummy, Value;
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmWordOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOWORD(Soft386RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
16,
|
|
State->GeneralRegs[SOFT386_REG_ECX].LowByte));
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupF6)
|
|
{
|
|
UCHAR Dummy, Value;
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmByteOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
switch (ModRegRm.Register)
|
|
{
|
|
/* TEST */
|
|
case 0:
|
|
case 1:
|
|
{
|
|
UCHAR Immediate, Result;
|
|
|
|
/* Fetch the immediate byte */
|
|
if (!Soft386FetchByte(State, &Immediate))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Result = Value & Immediate;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = FALSE;
|
|
State->Flags.Of = FALSE;
|
|
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
|
|
State->Flags.Sf = (Result & SIGN_FLAG_BYTE) ? TRUE : FALSE;
|
|
State->Flags.Pf = Soft386CalculateParity(Result);
|
|
|
|
break;
|
|
}
|
|
|
|
/* NOT */
|
|
case 2:
|
|
{
|
|
/* Write back the result */
|
|
return Soft386WriteModrmByteOperands(State, &ModRegRm, FALSE, ~Value);
|
|
}
|
|
|
|
/* NEG */
|
|
case 3:
|
|
{
|
|
/* Calculate the result */
|
|
UCHAR Result = -Value;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = (Value != 0) ? TRUE : FALSE;
|
|
State->Flags.Of = (Value & SIGN_FLAG_BYTE) && (Result & SIGN_FLAG_BYTE);
|
|
State->Flags.Af = ((Value & 0x0F) != 0) ? TRUE : FALSE;
|
|
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
|
|
State->Flags.Sf = (Result & SIGN_FLAG_BYTE) ? TRUE : FALSE;
|
|
State->Flags.Pf = Soft386CalculateParity(Result);
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmByteOperands(State, &ModRegRm, FALSE, Result);
|
|
}
|
|
|
|
/* MUL */
|
|
case 4:
|
|
{
|
|
USHORT Result = (USHORT)Value * (USHORT)State->GeneralRegs[SOFT386_REG_EAX].LowByte;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of = HIBYTE(Result) ? TRUE : FALSE;
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[SOFT386_REG_EAX].LowWord = Result;
|
|
|
|
break;
|
|
}
|
|
|
|
/* IMUL */
|
|
case 5:
|
|
{
|
|
SHORT Result = (SHORT)Value * (SHORT)State->GeneralRegs[SOFT386_REG_EAX].LowByte;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of =
|
|
((Result < -128) || (Result > 127)) ? TRUE : FALSE;
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[SOFT386_REG_EAX].LowWord = (USHORT)Result;
|
|
|
|
break;
|
|
}
|
|
|
|
/* DIV */
|
|
case 6:
|
|
{
|
|
UCHAR Quotient = State->GeneralRegs[SOFT386_REG_EAX].LowWord / Value;
|
|
UCHAR Remainder = State->GeneralRegs[SOFT386_REG_EAX].LowWord % Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[SOFT386_REG_EAX].LowByte = Quotient;
|
|
State->GeneralRegs[SOFT386_REG_EAX].HighByte = Remainder;
|
|
|
|
break;
|
|
}
|
|
|
|
/* IDIV */
|
|
case 7:
|
|
{
|
|
CHAR Quotient = (SHORT)State->GeneralRegs[SOFT386_REG_EAX].LowWord / (CHAR)Value;
|
|
CHAR Remainder = (SHORT)State->GeneralRegs[SOFT386_REG_EAX].LowWord % (CHAR)Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[SOFT386_REG_EAX].LowByte = (UCHAR)Quotient;
|
|
State->GeneralRegs[SOFT386_REG_EAX].HighByte = (UCHAR)Remainder;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupF7)
|
|
{
|
|
ULONG Dummy, Value, SignFlag;
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
|
|
{
|
|
/* The OPSIZE prefix toggles the size */
|
|
OperandSize = !OperandSize;
|
|
}
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set the sign flag */
|
|
if (OperandSize) SignFlag = SIGN_FLAG_LONG;
|
|
else SignFlag = SIGN_FLAG_WORD;
|
|
|
|
/* Read the operand */
|
|
if (OperandSize)
|
|
{
|
|
/* 32-bit */
|
|
if (!Soft386ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* 16-bit */
|
|
if (!Soft386ReadModrmWordOperands(State, &ModRegRm, (PUSHORT)&Dummy, (PUSHORT)&Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
switch (ModRegRm.Register)
|
|
{
|
|
/* TEST */
|
|
case 0:
|
|
case 1:
|
|
{
|
|
ULONG Immediate = 0, Result = 0;
|
|
|
|
if (OperandSize)
|
|
{
|
|
/* Fetch the immediate dword */
|
|
if (!Soft386FetchDword(State, &Immediate))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Fetch the immediate word */
|
|
if (!Soft386FetchWord(State, (PUSHORT)&Immediate))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Result = Value & Immediate;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = FALSE;
|
|
State->Flags.Of = FALSE;
|
|
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
|
|
State->Flags.Sf = (Result & SignFlag) ? TRUE : FALSE;
|
|
State->Flags.Pf = Soft386CalculateParity(Result);
|
|
|
|
break;
|
|
}
|
|
|
|
/* NOT */
|
|
case 2:
|
|
{
|
|
/* Write back the result */
|
|
if (OperandSize)
|
|
{
|
|
/* 32-bit */
|
|
return Soft386WriteModrmDwordOperands(State, &ModRegRm, FALSE, ~Value);
|
|
}
|
|
else
|
|
{
|
|
/* 16-bit */
|
|
return Soft386WriteModrmWordOperands(State, &ModRegRm, FALSE, LOWORD(~Value));
|
|
}
|
|
}
|
|
|
|
/* NEG */
|
|
case 3:
|
|
{
|
|
/* Calculate the result */
|
|
ULONG Result = -Value;
|
|
if (!OperandSize) Result &= 0xFFFF;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = (Value != 0) ? TRUE : FALSE;
|
|
State->Flags.Of = (Value & SignFlag) && (Result & SignFlag);
|
|
State->Flags.Af = ((Value & 0x0F) != 0) ? TRUE : FALSE;
|
|
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
|
|
State->Flags.Sf = (Result & SignFlag) ? TRUE : FALSE;
|
|
State->Flags.Pf = Soft386CalculateParity(Result);
|
|
|
|
/* Write back the result */
|
|
if (OperandSize)
|
|
{
|
|
/* 32-bit */
|
|
return Soft386WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result);
|
|
}
|
|
else
|
|
{
|
|
/* 16-bit */
|
|
return Soft386WriteModrmWordOperands(State, &ModRegRm, FALSE, LOWORD(Result));
|
|
}
|
|
}
|
|
|
|
/* MUL */
|
|
case 4:
|
|
{
|
|
if (OperandSize)
|
|
{
|
|
ULONGLONG Result = (ULONGLONG)Value * (ULONGLONG)State->GeneralRegs[SOFT386_REG_EAX].Long;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of =
|
|
(Result & 0xFFFFFFFF00000000ULL) ? TRUE : FALSE;
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[SOFT386_REG_EAX].Long = Result & 0xFFFFFFFFULL;
|
|
State->GeneralRegs[SOFT386_REG_EDX].Long = Result >> 32;
|
|
}
|
|
else
|
|
{
|
|
ULONG Result = (ULONG)Value * (ULONG)State->GeneralRegs[SOFT386_REG_EAX].LowWord;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of = HIWORD(Result) ? TRUE : FALSE;
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[SOFT386_REG_EAX].LowWord = LOWORD(Result);
|
|
State->GeneralRegs[SOFT386_REG_EDX].LowWord = HIWORD(Result);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* IMUL */
|
|
case 5:
|
|
{
|
|
if (OperandSize)
|
|
{
|
|
LONGLONG Result = (LONGLONG)Value * (LONGLONG)State->GeneralRegs[SOFT386_REG_EAX].Long;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of =
|
|
((Result < -2147483648LL) || (Result > 2147483647LL)) ? TRUE : FALSE;
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[SOFT386_REG_EAX].Long = Result & 0xFFFFFFFFULL;
|
|
State->GeneralRegs[SOFT386_REG_EDX].Long = Result >> 32;
|
|
}
|
|
else
|
|
{
|
|
LONG Result = (LONG)Value * (LONG)State->GeneralRegs[SOFT386_REG_EAX].LowWord;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of =
|
|
((Result < -32768) || (Result > 32767)) ? TRUE : FALSE;
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[SOFT386_REG_EAX].LowWord = LOWORD(Result);
|
|
State->GeneralRegs[SOFT386_REG_EDX].LowWord = HIWORD(Result);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* DIV */
|
|
case 6:
|
|
{
|
|
if (OperandSize)
|
|
{
|
|
ULONGLONG Dividend = (ULONGLONG)State->GeneralRegs[SOFT386_REG_EAX].Long
|
|
| ((ULONGLONG)State->GeneralRegs[SOFT386_REG_EDX].Long << 32);
|
|
ULONG Quotient = Dividend / Value;
|
|
ULONG Remainder = Dividend % Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[SOFT386_REG_EAX].Long = Quotient;
|
|
State->GeneralRegs[SOFT386_REG_EDX].Long = Remainder;
|
|
}
|
|
else
|
|
{
|
|
ULONG Dividend = (ULONG)State->GeneralRegs[SOFT386_REG_EAX].LowWord
|
|
| ((ULONG)State->GeneralRegs[SOFT386_REG_EDX].LowWord << 16);
|
|
USHORT Quotient = Dividend / Value;
|
|
USHORT Remainder = Dividend % Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[SOFT386_REG_EAX].LowWord = Quotient;
|
|
State->GeneralRegs[SOFT386_REG_EDX].LowWord = Remainder;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* IDIV */
|
|
case 7:
|
|
{
|
|
if (OperandSize)
|
|
{
|
|
LONGLONG Dividend = (LONGLONG)State->GeneralRegs[SOFT386_REG_EAX].Long
|
|
| ((LONGLONG)State->GeneralRegs[SOFT386_REG_EDX].Long << 32);
|
|
LONG Quotient = Dividend / (LONG)Value;
|
|
LONG Remainder = Dividend % (LONG)Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[SOFT386_REG_EAX].Long = (ULONG)Quotient;
|
|
State->GeneralRegs[SOFT386_REG_EDX].Long = (ULONG)Remainder;
|
|
}
|
|
else
|
|
{
|
|
LONG Dividend = (LONG)State->GeneralRegs[SOFT386_REG_EAX].LowWord
|
|
| ((LONG)State->GeneralRegs[SOFT386_REG_EDX].LowWord << 16);
|
|
SHORT Quotient = Dividend / (SHORT)Value;
|
|
SHORT Remainder = Dividend % (SHORT)Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[SOFT386_REG_EAX].LowWord = (USHORT)Quotient;
|
|
State->GeneralRegs[SOFT386_REG_EDX].LowWord = (USHORT)Remainder;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupFE)
|
|
{
|
|
UCHAR Dummy, Value;
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register > 1)
|
|
{
|
|
/* Invalid */
|
|
Soft386Exception(State, SOFT386_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (!Soft386ReadModrmByteOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register == 0)
|
|
{
|
|
/* Increment and update OF */
|
|
Value++;
|
|
State->Flags.Of = (Value == SIGN_FLAG_BYTE) ? TRUE : FALSE;
|
|
}
|
|
else
|
|
{
|
|
/* Decrement and update OF */
|
|
State->Flags.Of = (Value == SIGN_FLAG_BYTE) ? TRUE : FALSE;
|
|
Value--;
|
|
}
|
|
|
|
/* Update flags */
|
|
State->Flags.Sf = (Value & SIGN_FLAG_BYTE) ? TRUE : FALSE;
|
|
State->Flags.Zf = (Value == 0) ? TRUE : FALSE;
|
|
State->Flags.Af = ((Value & 0x0F) == 0) ? TRUE : FALSE;
|
|
State->Flags.Pf = Soft386CalculateParity(Value);
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmByteOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
|
|
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupFF)
|
|
{
|
|
SOFT386_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
|
|
{
|
|
/* The OPSIZE prefix toggles the size */
|
|
OperandSize = !OperandSize;
|
|
}
|
|
|
|
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
|
|
{
|
|
/* The ADSIZE prefix toggles the size */
|
|
AddressSize = !AddressSize;
|
|
}
|
|
|
|
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register == 7)
|
|
{
|
|
/* Invalid */
|
|
Soft386Exception(State, SOFT386_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (OperandSize)
|
|
{
|
|
ULONG Dummy, Value;
|
|
|
|
if (!Soft386ReadModrmDwordOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register == 0)
|
|
{
|
|
/* Increment and update OF */
|
|
Value++;
|
|
State->Flags.Of = (Value == SIGN_FLAG_LONG) ? TRUE : FALSE;
|
|
}
|
|
else if (ModRegRm.Register == 1)
|
|
{
|
|
/* Decrement and update OF */
|
|
State->Flags.Of = (Value == SIGN_FLAG_LONG) ? TRUE : FALSE;
|
|
Value--;
|
|
}
|
|
|
|
if (ModRegRm.Register <= 1)
|
|
{
|
|
/* Update flags */
|
|
State->Flags.Sf = (Value & SIGN_FLAG_LONG) ? TRUE : FALSE;
|
|
State->Flags.Zf = (Value == 0) ? TRUE : FALSE;
|
|
State->Flags.Af = ((Value & 0x0F) == 0) ? TRUE : FALSE;
|
|
State->Flags.Pf = Soft386CalculateParity(Value);
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmDwordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
USHORT Dummy, Value;
|
|
|
|
if (!Soft386ReadModrmWordOperands(State, &ModRegRm, &Dummy, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register == 0)
|
|
{
|
|
/* Increment and update OF */
|
|
Value++;
|
|
State->Flags.Of = (Value == SIGN_FLAG_WORD) ? TRUE : FALSE;
|
|
}
|
|
else if (ModRegRm.Register == 1)
|
|
{
|
|
/* Decrement and update OF */
|
|
State->Flags.Of = (Value == SIGN_FLAG_WORD) ? TRUE : FALSE;
|
|
Value--;
|
|
}
|
|
|
|
if (ModRegRm.Register <= 1)
|
|
{
|
|
/* Update flags */
|
|
State->Flags.Sf = (Value & SIGN_FLAG_WORD) ? TRUE : FALSE;
|
|
State->Flags.Zf = (Value == 0) ? TRUE : FALSE;
|
|
State->Flags.Af = ((Value & 0x0F) == 0) ? TRUE : FALSE;
|
|
State->Flags.Pf = Soft386CalculateParity(Value);
|
|
|
|
/* Write back the result */
|
|
return Soft386WriteModrmWordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
}
|
|
|
|
if (ModRegRm.Register > 1)
|
|
{
|
|
UNIMPLEMENTED;
|
|
return FALSE; // NOT IMPLEMENTED
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* EOF */
|
|
|