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18b844dffa
Fix the emulation of the Local Descriptor Table. svn path=/branches/ntvdm/; revision=61268
2362 lines
68 KiB
C
2362 lines
68 KiB
C
/*
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* Fast486 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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#include <windef.h>
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// #define NDEBUG
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#include <debug.h>
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#include <fast486.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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Fast486ArithmeticOperation(PFAST486_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 = (SignFlag - 1) | SignFlag;
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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) != 0);
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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 ^ SecondValue ^ Result) & 0x10) != 0;
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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 = Carry
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? (FirstValue <= SecondValue)
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: (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 ^ SecondValue ^ Result) & 0x10) != 0;
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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);
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State->Flags.Sf = ((Result & SignFlag) != 0);
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State->Flags.Pf = Fast486CalculateParity(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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Fast486RotateOperation(PFAST486_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 MaxValue = HighestBit | (HighestBit - 1);
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ULONG Result;
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/* Normalize the count */
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Count &= 0x1F;
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if ((Operation == 2) || (Operation == 3)) Count %= Bits + 1;
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/* If the count is zero, do nothing */
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if (Count == 0) return Value;
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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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Count %= Bits;
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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 = State->Flags.Cf
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^ ((Result & HighestBit) != 0);
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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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Count %= Bits;
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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) != 0);
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if (Count == 1) State->Flags.Of = State->Flags.Cf
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^ ((Result & (HighestBit >> 1)) != 0);
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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) | (State->Flags.Cf << (Count - 1));
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/* Complete the calculation, but make sure we don't shift by too much */
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if ((Bits - Count) < 31) Result |= Value >> (Bits - Count + 1);
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/* Update CF and OF */
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State->Flags.Cf = ((Value & (1 << (Bits - Count))) != 0);
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if (Count == 1) State->Flags.Of = State->Flags.Cf ^ ((Result & HighestBit) != 0);
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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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/* Update OF */
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if (Count == 1) State->Flags.Of = State->Flags.Cf ^ ((Value & HighestBit) != 0);
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Result = (Value >> Count) | (State->Flags.Cf << (Bits - Count));
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/* Complete the calculation, but make sure we don't shift by too much */
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if ((Bits - Count) < 31) Result |= Value << (Bits - Count + 1);
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/* Update CF */
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State->Flags.Cf = ((Value & (1 << (Count - 1))) != 0);
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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))) != 0);
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if (Count == 1) State->Flags.Of = State->Flags.Cf
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^ ((Result & HighestBit) != 0);
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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))) != 0);
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if (Count == 1) State->Flags.Of = ((Value & HighestBit) != 0);
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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 << (Count - 1))) != 0);
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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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if (Operation >= 4)
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{
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/* Update ZF, SF and PF */
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State->Flags.Zf = ((Result & MaxValue) == 0);
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State->Flags.Sf = ((Result & HighestBit) != 0);
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State->Flags.Pf = Fast486CalculateParity(Result);
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}
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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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FAST486_OPCODE_HANDLER(Fast486OpcodeGroup8082)
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{
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UCHAR Immediate, Value;
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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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TOGGLE_ADSIZE(AddressSize);
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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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/* Fetch the immediate operand */
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if (!Fast486FetchByte(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 (!Fast486ReadModrmByteOperands(State, &ModRegRm, NULL, &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 = Fast486ArithmeticOperation(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 Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Value);
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}
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return TRUE;
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}
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FAST486_OPCODE_HANDLER(Fast486OpcodeGroup81)
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{
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FAST486_MOD_REG_RM ModRegRm;
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BOOLEAN OperandSize, AddressSize;
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OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
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TOGGLE_OPSIZE(OperandSize);
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TOGGLE_ADSIZE(AddressSize);
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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 (OperandSize)
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{
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ULONG Immediate, Value;
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/* Fetch the immediate operand */
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if (!Fast486FetchDword(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 (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &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 = Fast486ArithmeticOperation(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 Fast486WriteModrmDwordOperands(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;
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/* Fetch the immediate operand */
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if (!Fast486FetchWord(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 (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &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 = Fast486ArithmeticOperation(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 Fast486WriteModrmWordOperands(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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FAST486_OPCODE_HANDLER(Fast486OpcodeGroup83)
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{
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CHAR ImmByte;
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FAST486_MOD_REG_RM ModRegRm;
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BOOLEAN OperandSize, AddressSize;
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OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
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TOGGLE_OPSIZE(OperandSize);
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TOGGLE_ADSIZE(AddressSize);
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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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/* Fetch the immediate operand */
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if (!Fast486FetchByte(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;
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/* Read the operands */
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if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &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 = Fast486ArithmeticOperation(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 Fast486WriteModrmDwordOperands(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;
|
|
|
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/* Read the operands */
|
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if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &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 = Fast486ArithmeticOperation(State, ModRegRm.Register, Value, Immediate, 16);
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|
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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 Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
|
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}
|
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}
|
|
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return TRUE;
|
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}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroup8F)
|
|
{
|
|
ULONG Value;
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
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TOGGLE_OPSIZE(OperandSize);
|
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TOGGLE_ADSIZE(AddressSize);
|
|
|
|
/* Pop a value from the stack - this must be done first */
|
|
if (!Fast486StackPop(State, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred - restore SP */
|
|
if (OperandSize) State->GeneralRegs[FAST486_REG_ESP].Long -= sizeof(ULONG);
|
|
else State->GeneralRegs[FAST486_REG_ESP].LowWord -= sizeof(USHORT);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register != 0)
|
|
{
|
|
/* Invalid */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
return Fast486WriteModrmDwordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
else
|
|
{
|
|
return Fast486WriteModrmWordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
LOWORD(Value));
|
|
}
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupC0)
|
|
{
|
|
UCHAR Value, Count;
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Fetch the count */
|
|
if (!Fast486FetchByte(State, &Count))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmByteOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOBYTE(Fast486RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
8,
|
|
Count));
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmByteOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupC1)
|
|
{
|
|
UCHAR Count;
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_OPSIZE(OperandSize);
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Fetch the count */
|
|
if (!Fast486FetchByte(State, &Count))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
ULONG Value;
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = Fast486RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
32,
|
|
Count);
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
else
|
|
{
|
|
USHORT Value;
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOWORD(Fast486RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
16,
|
|
Count));
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupC6)
|
|
{
|
|
UCHAR Immediate;
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register != 0)
|
|
{
|
|
/* Invalid */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Get the immediate operand */
|
|
if (!Fast486FetchByte(State, &Immediate))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
return Fast486WriteModrmByteOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Immediate);
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupC7)
|
|
{
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_OPSIZE(OperandSize);
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register != 0)
|
|
{
|
|
/* Invalid */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
ULONG Immediate;
|
|
|
|
/* Get the immediate operand */
|
|
if (!Fast486FetchDword(State, &Immediate))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
return Fast486WriteModrmDwordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Immediate);
|
|
}
|
|
else
|
|
{
|
|
USHORT Immediate;
|
|
|
|
/* Get the immediate operand */
|
|
if (!Fast486FetchWord(State, &Immediate))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
return Fast486WriteModrmWordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Immediate);
|
|
}
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupD0)
|
|
{
|
|
UCHAR Value;
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmByteOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOBYTE(Fast486RotateOperation(State, ModRegRm.Register, Value, 8, 1));
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmByteOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupD1)
|
|
{
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_OPSIZE(OperandSize);
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
ULONG Value;
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = Fast486RotateOperation(State, ModRegRm.Register, Value, 32, 1);
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
else
|
|
{
|
|
USHORT Value;
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOWORD(Fast486RotateOperation(State, ModRegRm.Register, Value, 16, 1));
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupD2)
|
|
{
|
|
UCHAR Value;
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmByteOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOBYTE(Fast486RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
8,
|
|
State->GeneralRegs[FAST486_REG_ECX].LowByte));
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmByteOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupD3)
|
|
{
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_OPSIZE(OperandSize);
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
ULONG Value;
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = Fast486RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
32,
|
|
State->GeneralRegs[FAST486_REG_ECX].LowByte);
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
else
|
|
{
|
|
USHORT Value;
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Calculate the result */
|
|
Value = LOWORD(Fast486RotateOperation(State,
|
|
ModRegRm.Register,
|
|
Value,
|
|
16,
|
|
State->GeneralRegs[FAST486_REG_ECX].LowByte));
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
|
|
}
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupF6)
|
|
{
|
|
UCHAR Value = 0;
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmByteOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
switch (ModRegRm.Register)
|
|
{
|
|
/* TEST */
|
|
case 0:
|
|
case 1:
|
|
{
|
|
UCHAR Immediate, Result;
|
|
|
|
/* Fetch the immediate byte */
|
|
if (!Fast486FetchByte(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);
|
|
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
|
|
State->Flags.Pf = Fast486CalculateParity(Result);
|
|
|
|
break;
|
|
}
|
|
|
|
/* NOT */
|
|
case 2:
|
|
{
|
|
/* Write back the result */
|
|
return Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, ~Value);
|
|
}
|
|
|
|
/* NEG */
|
|
case 3:
|
|
{
|
|
/* Calculate the result */
|
|
UCHAR Result = -Value;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = (Value != 0);
|
|
State->Flags.Of = (Value & SIGN_FLAG_BYTE) && (Result & SIGN_FLAG_BYTE);
|
|
State->Flags.Af = ((Value & 0x0F) != 0);
|
|
State->Flags.Zf = (Result == 0);
|
|
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
|
|
State->Flags.Pf = Fast486CalculateParity(Result);
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Result);
|
|
}
|
|
|
|
/* MUL */
|
|
case 4:
|
|
{
|
|
USHORT Result = (USHORT)Value * (USHORT)State->GeneralRegs[FAST486_REG_EAX].LowByte;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of = (HIBYTE(Result) != 0);
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[FAST486_REG_EAX].LowWord = Result;
|
|
|
|
break;
|
|
}
|
|
|
|
/* IMUL */
|
|
case 5:
|
|
{
|
|
SHORT Result = (SHORT)((CHAR)Value) * (SHORT)((CHAR)State->GeneralRegs[FAST486_REG_EAX].LowByte);
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of = ((Result < -128) || (Result > 127));
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[FAST486_REG_EAX].LowWord = (USHORT)Result;
|
|
|
|
break;
|
|
}
|
|
|
|
/* DIV */
|
|
case 6:
|
|
{
|
|
UCHAR Quotient, Remainder;
|
|
|
|
if (Value == 0)
|
|
{
|
|
/* Divide error */
|
|
Fast486Exception(State, FAST486_EXCEPTION_DE);
|
|
return FALSE;
|
|
}
|
|
|
|
Quotient = State->GeneralRegs[FAST486_REG_EAX].LowWord / Value;
|
|
Remainder = State->GeneralRegs[FAST486_REG_EAX].LowWord % Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[FAST486_REG_EAX].LowByte = Quotient;
|
|
State->GeneralRegs[FAST486_REG_EAX].HighByte = Remainder;
|
|
|
|
break;
|
|
}
|
|
|
|
/* IDIV */
|
|
case 7:
|
|
{
|
|
CHAR Quotient, Remainder;
|
|
|
|
if (Value == 0)
|
|
{
|
|
/* Divide error */
|
|
Fast486Exception(State, FAST486_EXCEPTION_DE);
|
|
return FALSE;
|
|
}
|
|
|
|
Quotient = (SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord / (CHAR)Value;
|
|
Remainder = (SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord % (CHAR)Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[FAST486_REG_EAX].LowByte = (UCHAR)Quotient;
|
|
State->GeneralRegs[FAST486_REG_EAX].HighByte = (UCHAR)Remainder;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupF7)
|
|
{
|
|
ULONG Value = 0, SignFlag;
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_OPSIZE(OperandSize);
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(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 (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* 16-bit */
|
|
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, (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 (!Fast486FetchDword(State, &Immediate))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Fetch the immediate word */
|
|
if (!Fast486FetchWord(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);
|
|
State->Flags.Sf = ((Result & SignFlag) != 0);
|
|
State->Flags.Pf = Fast486CalculateParity(Result);
|
|
|
|
break;
|
|
}
|
|
|
|
/* NOT */
|
|
case 2:
|
|
{
|
|
/* Write back the result */
|
|
if (OperandSize)
|
|
{
|
|
/* 32-bit */
|
|
return Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, ~Value);
|
|
}
|
|
else
|
|
{
|
|
/* 16-bit */
|
|
return Fast486WriteModrmWordOperands(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);
|
|
State->Flags.Of = (Value & SignFlag) && (Result & SignFlag);
|
|
State->Flags.Af = ((Value & 0x0F) != 0);
|
|
State->Flags.Zf = (Result == 0);
|
|
State->Flags.Sf = ((Result & SignFlag) != 0);
|
|
State->Flags.Pf = Fast486CalculateParity(Result);
|
|
|
|
/* Write back the result */
|
|
if (OperandSize)
|
|
{
|
|
/* 32-bit */
|
|
return Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result);
|
|
}
|
|
else
|
|
{
|
|
/* 16-bit */
|
|
return Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, LOWORD(Result));
|
|
}
|
|
}
|
|
|
|
/* MUL */
|
|
case 4:
|
|
{
|
|
if (OperandSize)
|
|
{
|
|
ULONGLONG Result = (ULONGLONG)Value * (ULONGLONG)State->GeneralRegs[FAST486_REG_EAX].Long;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of = ((Result & 0xFFFFFFFF00000000ULL) != 0);
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[FAST486_REG_EAX].Long = Result & 0xFFFFFFFFULL;
|
|
State->GeneralRegs[FAST486_REG_EDX].Long = Result >> 32;
|
|
}
|
|
else
|
|
{
|
|
ULONG Result = (ULONG)Value * (ULONG)State->GeneralRegs[FAST486_REG_EAX].LowWord;
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of = (HIWORD(Result) != 0);
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[FAST486_REG_EAX].LowWord = LOWORD(Result);
|
|
State->GeneralRegs[FAST486_REG_EDX].LowWord = HIWORD(Result);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* IMUL */
|
|
case 5:
|
|
{
|
|
if (OperandSize)
|
|
{
|
|
LONGLONG Result = (LONGLONG)((LONG)Value) * (LONGLONG)((LONG)State->GeneralRegs[FAST486_REG_EAX].Long);
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of = ((Result < -2147483648LL) || (Result > 2147483647LL));
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[FAST486_REG_EAX].Long = Result & 0xFFFFFFFFULL;
|
|
State->GeneralRegs[FAST486_REG_EDX].Long = Result >> 32;
|
|
}
|
|
else
|
|
{
|
|
LONG Result = (LONG)((SHORT)Value) * (LONG)((SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord);
|
|
|
|
/* Update the flags */
|
|
State->Flags.Cf = State->Flags.Of = ((Result < -32768) || (Result > 32767));
|
|
|
|
/* Write back the result */
|
|
State->GeneralRegs[FAST486_REG_EAX].LowWord = LOWORD(Result);
|
|
State->GeneralRegs[FAST486_REG_EDX].LowWord = HIWORD(Result);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* DIV */
|
|
case 6:
|
|
{
|
|
if (Value == 0)
|
|
{
|
|
/* Divide error */
|
|
Fast486Exception(State, FAST486_EXCEPTION_DE);
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
ULONGLONG Dividend = (ULONGLONG)State->GeneralRegs[FAST486_REG_EAX].Long
|
|
| ((ULONGLONG)State->GeneralRegs[FAST486_REG_EDX].Long << 32);
|
|
ULONG Quotient = Dividend / Value;
|
|
ULONG Remainder = Dividend % Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[FAST486_REG_EAX].Long = Quotient;
|
|
State->GeneralRegs[FAST486_REG_EDX].Long = Remainder;
|
|
}
|
|
else
|
|
{
|
|
ULONG Dividend = (ULONG)State->GeneralRegs[FAST486_REG_EAX].LowWord
|
|
| ((ULONG)State->GeneralRegs[FAST486_REG_EDX].LowWord << 16);
|
|
USHORT Quotient = Dividend / Value;
|
|
USHORT Remainder = Dividend % Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[FAST486_REG_EAX].LowWord = Quotient;
|
|
State->GeneralRegs[FAST486_REG_EDX].LowWord = Remainder;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* IDIV */
|
|
case 7:
|
|
{
|
|
if (Value == 0)
|
|
{
|
|
/* Divide error */
|
|
Fast486Exception(State, FAST486_EXCEPTION_DE);
|
|
return FALSE;
|
|
}
|
|
|
|
if (OperandSize)
|
|
{
|
|
LONGLONG Dividend = (LONGLONG)State->GeneralRegs[FAST486_REG_EAX].Long
|
|
| ((LONGLONG)State->GeneralRegs[FAST486_REG_EDX].Long << 32);
|
|
LONG Quotient = Dividend / (LONG)Value;
|
|
LONG Remainder = Dividend % (LONG)Value;
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[FAST486_REG_EAX].Long = (ULONG)Quotient;
|
|
State->GeneralRegs[FAST486_REG_EDX].Long = (ULONG)Remainder;
|
|
}
|
|
else
|
|
{
|
|
LONG Dividend = (LONG)State->GeneralRegs[FAST486_REG_EAX].LowWord
|
|
| ((LONG)State->GeneralRegs[FAST486_REG_EDX].LowWord << 16);
|
|
SHORT Quotient = Dividend / (SHORT)LOWORD(Value);
|
|
SHORT Remainder = Dividend % (SHORT)LOWORD(Value);
|
|
|
|
/* Write back the results */
|
|
State->GeneralRegs[FAST486_REG_EAX].LowWord = (USHORT)Quotient;
|
|
State->GeneralRegs[FAST486_REG_EDX].LowWord = (USHORT)Remainder;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupFE)
|
|
{
|
|
UCHAR Value;
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register > 1)
|
|
{
|
|
/* Invalid */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (!Fast486ReadModrmByteOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register == 0)
|
|
{
|
|
/* Increment and update OF and AF */
|
|
Value++;
|
|
State->Flags.Of = (Value == SIGN_FLAG_BYTE);
|
|
State->Flags.Af = ((Value & 0x0F) == 0);
|
|
}
|
|
else
|
|
{
|
|
/* Decrement and update OF and AF */
|
|
State->Flags.Of = (Value == SIGN_FLAG_BYTE);
|
|
Value--;
|
|
State->Flags.Af = ((Value & 0x0F) == 0x0F);
|
|
}
|
|
|
|
/* Update flags */
|
|
State->Flags.Zf = (Value == 0);
|
|
State->Flags.Sf = ((Value & SIGN_FLAG_BYTE) != 0);
|
|
State->Flags.Pf = Fast486CalculateParity(Value);
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmByteOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroupFF)
|
|
{
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
|
|
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_OPSIZE(OperandSize);
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register == 7)
|
|
{
|
|
/* Invalid */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the operands */
|
|
if (OperandSize)
|
|
{
|
|
ULONG Value;
|
|
|
|
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register == 0)
|
|
{
|
|
/* Increment and update OF and AF */
|
|
Value++;
|
|
State->Flags.Of = (Value == SIGN_FLAG_LONG);
|
|
State->Flags.Af = ((Value & 0x0F) == 0);
|
|
}
|
|
else if (ModRegRm.Register == 1)
|
|
{
|
|
/* Decrement and update OF and AF */
|
|
State->Flags.Of = (Value == SIGN_FLAG_LONG);
|
|
Value--;
|
|
State->Flags.Af = ((Value & 0x0F) == 0x0F);
|
|
}
|
|
else if (ModRegRm.Register == 2)
|
|
{
|
|
/* Push the current value of EIP */
|
|
if (!Fast486StackPush(State, State->InstPtr.Long))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set the EIP to the address */
|
|
State->InstPtr.Long = Value;
|
|
}
|
|
else if (ModRegRm.Register == 3)
|
|
{
|
|
USHORT Selector;
|
|
FAST486_SEG_REGS Segment = FAST486_REG_DS;
|
|
|
|
/* Check for the segment override */
|
|
if (State->PrefixFlags & FAST486_PREFIX_SEG)
|
|
{
|
|
/* Use the override segment instead */
|
|
Segment = State->SegmentOverride;
|
|
}
|
|
|
|
/* Read the selector */
|
|
if (!Fast486ReadMemory(State,
|
|
Segment,
|
|
ModRegRm.MemoryAddress + sizeof(ULONG),
|
|
FALSE,
|
|
&Selector,
|
|
sizeof(USHORT)))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Push the current value of CS */
|
|
if (!Fast486StackPush(State, State->SegmentRegs[FAST486_REG_CS].Selector))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Push the current value of EIP */
|
|
if (!Fast486StackPush(State, State->InstPtr.Long))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Load the new code segment */
|
|
if (!Fast486LoadSegment(State, FAST486_REG_CS, Selector))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set the EIP to the address */
|
|
State->InstPtr.Long = Value;
|
|
}
|
|
else if (ModRegRm.Register == 4)
|
|
{
|
|
/* Set the EIP to the address */
|
|
State->InstPtr.Long = Value;
|
|
}
|
|
else if (ModRegRm.Register == 5)
|
|
{
|
|
USHORT Selector;
|
|
FAST486_SEG_REGS Segment = FAST486_REG_DS;
|
|
|
|
/* Check for the segment override */
|
|
if (State->PrefixFlags & FAST486_PREFIX_SEG)
|
|
{
|
|
/* Use the override segment instead */
|
|
Segment = State->SegmentOverride;
|
|
}
|
|
|
|
/* Read the selector */
|
|
if (!Fast486ReadMemory(State,
|
|
Segment,
|
|
ModRegRm.MemoryAddress + sizeof(ULONG),
|
|
FALSE,
|
|
&Selector,
|
|
sizeof(USHORT)))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Load the new code segment */
|
|
if (!Fast486LoadSegment(State, FAST486_REG_CS, Selector))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set the EIP to the address */
|
|
State->InstPtr.Long = Value;
|
|
}
|
|
else if (ModRegRm.Register == 6)
|
|
{
|
|
/* Push the value on to the stack */
|
|
return Fast486StackPush(State, Value);
|
|
}
|
|
|
|
if (ModRegRm.Register <= 1)
|
|
{
|
|
/* Update flags */
|
|
State->Flags.Sf = ((Value & SIGN_FLAG_LONG) != 0);
|
|
State->Flags.Zf = (Value == 0);
|
|
State->Flags.Pf = Fast486CalculateParity(Value);
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmDwordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
USHORT Value;
|
|
|
|
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register == 0)
|
|
{
|
|
/* Increment and update OF */
|
|
Value++;
|
|
State->Flags.Of = (Value == SIGN_FLAG_WORD);
|
|
State->Flags.Af = ((Value & 0x0F) == 0);
|
|
}
|
|
else if (ModRegRm.Register == 1)
|
|
{
|
|
/* Decrement and update OF */
|
|
State->Flags.Of = (Value == SIGN_FLAG_WORD);
|
|
Value--;
|
|
State->Flags.Af = ((Value & 0x0F) == 0x0F);
|
|
}
|
|
else if (ModRegRm.Register == 2)
|
|
{
|
|
/* Push the current value of IP */
|
|
if (!Fast486StackPush(State, State->InstPtr.LowWord))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set the IP to the address */
|
|
State->InstPtr.LowWord = Value;
|
|
|
|
/* Clear the top half of EIP */
|
|
State->InstPtr.Long &= 0xFFFF;
|
|
}
|
|
else if (ModRegRm.Register == 3)
|
|
{
|
|
USHORT Selector;
|
|
FAST486_SEG_REGS Segment = FAST486_REG_DS;
|
|
|
|
/* Check for the segment override */
|
|
if (State->PrefixFlags & FAST486_PREFIX_SEG)
|
|
{
|
|
/* Use the override segment instead */
|
|
Segment = State->SegmentOverride;
|
|
}
|
|
|
|
/* Read the selector */
|
|
if (!Fast486ReadMemory(State,
|
|
Segment,
|
|
ModRegRm.MemoryAddress + sizeof(USHORT),
|
|
FALSE,
|
|
&Selector,
|
|
sizeof(USHORT)))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Push the current value of CS */
|
|
if (!Fast486StackPush(State, State->SegmentRegs[FAST486_REG_CS].Selector))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Push the current value of IP */
|
|
if (!Fast486StackPush(State, State->InstPtr.LowWord))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Load the new code segment */
|
|
if (!Fast486LoadSegment(State, FAST486_REG_CS, Selector))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set the IP to the address */
|
|
State->InstPtr.LowWord = Value;
|
|
|
|
/* Clear the top half of EIP */
|
|
State->InstPtr.Long &= 0xFFFF;
|
|
}
|
|
else if (ModRegRm.Register == 4)
|
|
{
|
|
/* Set the IP to the address */
|
|
State->InstPtr.LowWord = Value;
|
|
}
|
|
else if (ModRegRm.Register == 5)
|
|
{
|
|
USHORT Selector;
|
|
FAST486_SEG_REGS Segment = FAST486_REG_DS;
|
|
|
|
/* Check for the segment override */
|
|
if (State->PrefixFlags & FAST486_PREFIX_SEG)
|
|
{
|
|
/* Use the override segment instead */
|
|
Segment = State->SegmentOverride;
|
|
}
|
|
|
|
/* Read the selector */
|
|
if (!Fast486ReadMemory(State,
|
|
Segment,
|
|
ModRegRm.MemoryAddress + sizeof(USHORT),
|
|
FALSE,
|
|
&Selector,
|
|
sizeof(USHORT)))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Load the new code segment */
|
|
if (!Fast486LoadSegment(State, FAST486_REG_CS, Selector))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set the IP to the address */
|
|
State->InstPtr.LowWord = Value;
|
|
|
|
/* Clear the top half of EIP */
|
|
State->InstPtr.Long &= 0xFFFF;
|
|
}
|
|
else if (ModRegRm.Register == 6)
|
|
{
|
|
/* Push the value on to the stack */
|
|
return Fast486StackPush(State, Value);
|
|
}
|
|
else
|
|
{
|
|
/* Invalid */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register <= 1)
|
|
{
|
|
/* Update flags */
|
|
State->Flags.Sf = ((Value & SIGN_FLAG_WORD) != 0);
|
|
State->Flags.Zf = (Value == 0);
|
|
State->Flags.Pf = Fast486CalculateParity(Value);
|
|
|
|
/* Write back the result */
|
|
return Fast486WriteModrmWordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
Value);
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroup0F00)
|
|
{
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
NO_LOCK_PREFIX();
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Check which operation this is */
|
|
switch (ModRegRm.Register)
|
|
{
|
|
/* SLDT */
|
|
case 0:
|
|
{
|
|
/* Not recognized in real mode or virtual 8086 mode */
|
|
if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
|
|
|| State->Flags.Vm)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
}
|
|
|
|
return Fast486WriteModrmWordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
State->Ldtr.Selector);
|
|
}
|
|
|
|
/* STR */
|
|
case 1:
|
|
{
|
|
/* Not recognized in real mode or virtual 8086 mode */
|
|
if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
|
|
|| State->Flags.Vm)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
}
|
|
|
|
return Fast486WriteModrmWordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
State->TaskReg.Selector);
|
|
}
|
|
|
|
/* LLDT */
|
|
case 2:
|
|
{
|
|
USHORT Selector;
|
|
FAST486_SYSTEM_DESCRIPTOR GdtEntry;
|
|
|
|
/* Not recognized in real mode or virtual 8086 mode */
|
|
if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
|
|
|| State->Flags.Vm)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
}
|
|
|
|
/* This is a privileged instruction */
|
|
if (Fast486GetCurrentPrivLevel(State) != 0)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_GP);
|
|
return FALSE;
|
|
}
|
|
|
|
if (!Fast486ReadModrmWordOperands(State,
|
|
&ModRegRm,
|
|
NULL,
|
|
&Selector))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Make sure the GDT contains the entry */
|
|
if (GET_SEGMENT_INDEX(Selector) >= (State->Gdtr.Size + 1))
|
|
{
|
|
Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_GP, Selector);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the GDT */
|
|
if (!Fast486ReadLinearMemory(State,
|
|
State->Gdtr.Address
|
|
+ GET_SEGMENT_INDEX(Selector),
|
|
&GdtEntry,
|
|
sizeof(GdtEntry)))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (GET_SEGMENT_INDEX(Selector) == 0)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_GP);
|
|
return FALSE;
|
|
}
|
|
|
|
if (!GdtEntry.Present)
|
|
{
|
|
Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_NP, Selector);
|
|
return FALSE;
|
|
}
|
|
|
|
if (GdtEntry.Signature != FAST486_LDT_SIGNATURE)
|
|
{
|
|
/* This is not a LDT descriptor */
|
|
Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_GP, Selector);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Update the LDTR */
|
|
State->Ldtr.Selector = Selector;
|
|
State->Ldtr.Base = GdtEntry.Base | (GdtEntry.BaseMid << 16) | (GdtEntry.BaseHigh << 24);
|
|
State->Ldtr.Limit = GdtEntry.Limit | (GdtEntry.LimitHigh << 16);
|
|
if (GdtEntry.Granularity) State->Ldtr.Limit <<= 12;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* LTR */
|
|
case 3:
|
|
{
|
|
USHORT Selector;
|
|
FAST486_SYSTEM_DESCRIPTOR GdtEntry;
|
|
|
|
/* Not recognized in real mode or virtual 8086 mode */
|
|
if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
|
|
|| State->Flags.Vm)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
}
|
|
|
|
/* This is a privileged instruction */
|
|
if (Fast486GetCurrentPrivLevel(State) != 0)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_GP);
|
|
return FALSE;
|
|
}
|
|
|
|
if (!Fast486ReadModrmWordOperands(State,
|
|
&ModRegRm,
|
|
NULL,
|
|
&Selector))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Make sure the GDT contains the entry */
|
|
if (GET_SEGMENT_INDEX(Selector) >= (State->Gdtr.Size + 1))
|
|
{
|
|
Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_GP, Selector);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the GDT */
|
|
if (!Fast486ReadLinearMemory(State,
|
|
State->Gdtr.Address
|
|
+ GET_SEGMENT_INDEX(Selector),
|
|
&GdtEntry,
|
|
sizeof(GdtEntry)))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (GET_SEGMENT_INDEX(Selector) == 0)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_GP);
|
|
return FALSE;
|
|
}
|
|
|
|
if (!GdtEntry.Present)
|
|
{
|
|
Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_NP, Selector);
|
|
return FALSE;
|
|
}
|
|
|
|
if (GdtEntry.Signature != FAST486_TSS_SIGNATURE)
|
|
{
|
|
/* This is not a TSS descriptor */
|
|
Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_GP, Selector);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Update the TR */
|
|
State->TaskReg.Selector = Selector;
|
|
State->TaskReg.Base = GdtEntry.Base | (GdtEntry.BaseMid << 16) | (GdtEntry.BaseHigh << 24);
|
|
State->TaskReg.Limit = GdtEntry.Limit | (GdtEntry.LimitHigh << 16);
|
|
if (GdtEntry.Granularity) State->TaskReg.Limit <<= 12;
|
|
State->TaskReg.Busy = TRUE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* VERR/VERW */
|
|
case 4:
|
|
case 5:
|
|
{
|
|
USHORT Selector;
|
|
FAST486_GDT_ENTRY GdtEntry;
|
|
|
|
/* Not recognized in real mode or virtual 8086 mode */
|
|
if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
|
|
|| State->Flags.Vm)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
}
|
|
|
|
/* This is a privileged instruction */
|
|
if (Fast486GetCurrentPrivLevel(State) != 0)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_GP);
|
|
return FALSE;
|
|
}
|
|
|
|
if (!Fast486ReadModrmWordOperands(State,
|
|
&ModRegRm,
|
|
NULL,
|
|
&Selector))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (!(Selector & SEGMENT_TABLE_INDICATOR))
|
|
{
|
|
/* Make sure the GDT contains the entry */
|
|
if (GET_SEGMENT_INDEX(Selector) >= (State->Gdtr.Size + 1))
|
|
{
|
|
/* Clear ZF */
|
|
State->Flags.Zf = FALSE;
|
|
return TRUE;
|
|
}
|
|
|
|
/* Read the GDT */
|
|
if (!Fast486ReadLinearMemory(State,
|
|
State->Gdtr.Address
|
|
+ GET_SEGMENT_INDEX(Selector),
|
|
&GdtEntry,
|
|
sizeof(GdtEntry)))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Make sure the LDT contains the entry */
|
|
if (GET_SEGMENT_INDEX(Selector) >= (State->Ldtr.Limit + 1))
|
|
{
|
|
/* Clear ZF */
|
|
State->Flags.Zf = FALSE;
|
|
return TRUE;
|
|
}
|
|
|
|
/* Read the LDT */
|
|
if (!Fast486ReadLinearMemory(State,
|
|
State->Ldtr.Base
|
|
+ GET_SEGMENT_INDEX(Selector),
|
|
&GdtEntry,
|
|
sizeof(GdtEntry)))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* Set ZF if it is valid and accessible */
|
|
State->Flags.Zf = GdtEntry.Present // must be present
|
|
&& GdtEntry.SystemType // must be a segment
|
|
&& (((ModRegRm.Register == 4)
|
|
/* code segments are only readable if the RW bit is set */
|
|
&& (!GdtEntry.Executable || GdtEntry.ReadWrite))
|
|
|| ((ModRegRm.Register == 5)
|
|
/* code segments are never writable, data segments are writable when RW is set */
|
|
&& (!GdtEntry.Executable && GdtEntry.ReadWrite)))
|
|
/*
|
|
* for segments other than conforming code segments,
|
|
* both RPL and CPL must be less than or equal to DPL
|
|
*/
|
|
&& ((!GdtEntry.Executable || !GdtEntry.DirConf)
|
|
&& ((GET_SEGMENT_RPL(Selector) <= GdtEntry.Dpl)
|
|
&& (Fast486GetCurrentPrivLevel(State) <= GdtEntry.Dpl)))
|
|
/* for conforming code segments, DPL must be less than or equal to CPL */
|
|
&& ((GdtEntry.Executable && GdtEntry.DirConf)
|
|
&& (GdtEntry.Dpl <= Fast486GetCurrentPrivLevel(State)));
|
|
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Invalid */
|
|
default:
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroup0F01)
|
|
{
|
|
UCHAR TableReg[6];
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
FAST486_SEG_REGS Segment = FAST486_REG_DS;
|
|
|
|
NO_LOCK_PREFIX();
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Check for the segment override */
|
|
if (State->PrefixFlags & FAST486_PREFIX_SEG)
|
|
{
|
|
/* Use the override segment instead */
|
|
Segment = State->SegmentOverride;
|
|
}
|
|
|
|
/* Check which operation this is */
|
|
switch (ModRegRm.Register)
|
|
{
|
|
/* SGDT */
|
|
case 0:
|
|
{
|
|
if (!ModRegRm.Memory)
|
|
{
|
|
/* The second operand must be a memory location */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Fill the 6-byte table register */
|
|
RtlCopyMemory(TableReg, &State->Gdtr.Size, sizeof(USHORT));
|
|
RtlCopyMemory(&TableReg[sizeof(USHORT)], &State->Gdtr.Address, sizeof(ULONG));
|
|
|
|
/* Store the GDTR */
|
|
return Fast486WriteMemory(State,
|
|
Segment,
|
|
ModRegRm.MemoryAddress,
|
|
TableReg,
|
|
sizeof(TableReg));
|
|
}
|
|
|
|
/* SIDT */
|
|
case 1:
|
|
{
|
|
if (!ModRegRm.Memory)
|
|
{
|
|
/* The second operand must be a memory location */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Fill the 6-byte table register */
|
|
RtlCopyMemory(TableReg, &State->Idtr.Size, sizeof(USHORT));
|
|
RtlCopyMemory(&TableReg[sizeof(USHORT)], &State->Idtr.Address, sizeof(ULONG));
|
|
|
|
/* Store the IDTR */
|
|
return Fast486WriteMemory(State,
|
|
Segment,
|
|
ModRegRm.MemoryAddress,
|
|
TableReg,
|
|
sizeof(TableReg));
|
|
}
|
|
|
|
/* LGDT */
|
|
case 2:
|
|
{
|
|
/* This is a privileged instruction */
|
|
if (Fast486GetCurrentPrivLevel(State) != 0)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_GP);
|
|
return FALSE;
|
|
}
|
|
|
|
if (!ModRegRm.Memory)
|
|
{
|
|
/* The second operand must be a memory location */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the new GDTR */
|
|
if (!Fast486ReadMemory(State,
|
|
Segment,
|
|
ModRegRm.MemoryAddress,
|
|
FALSE,
|
|
TableReg,
|
|
sizeof(TableReg)))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Load the new GDT */
|
|
State->Gdtr.Size = *((PUSHORT)TableReg);
|
|
State->Gdtr.Address = *((PULONG)&TableReg[sizeof(USHORT)]);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* LIDT */
|
|
case 3:
|
|
{
|
|
/* This is a privileged instruction */
|
|
if (Fast486GetCurrentPrivLevel(State) != 0)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_GP);
|
|
return FALSE;
|
|
}
|
|
|
|
if (!ModRegRm.Memory)
|
|
{
|
|
/* The second operand must be a memory location */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the new IDTR */
|
|
if (!Fast486ReadMemory(State,
|
|
Segment,
|
|
ModRegRm.MemoryAddress,
|
|
FALSE,
|
|
TableReg,
|
|
sizeof(TableReg)))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Load the new IDT */
|
|
State->Idtr.Size = *((PUSHORT)TableReg);
|
|
State->Idtr.Address = *((PULONG)&TableReg[sizeof(USHORT)]);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* SMSW */
|
|
case 4:
|
|
{
|
|
/* Store the lower 16 bits (Machine Status Word) of CR0 */
|
|
return Fast486WriteModrmWordOperands(State,
|
|
&ModRegRm,
|
|
FALSE,
|
|
LOWORD(State->ControlRegisters[FAST486_REG_CR0]));
|
|
}
|
|
|
|
/* LMSW */
|
|
case 6:
|
|
{
|
|
USHORT MachineStatusWord;
|
|
|
|
/* This is a privileged instruction */
|
|
if (Fast486GetCurrentPrivLevel(State) != 0)
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_GP);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the new Machine Status Word */
|
|
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &MachineStatusWord))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* This instruction cannot be used to return to real mode */
|
|
if ((State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
|
|
&& !(MachineStatusWord & FAST486_CR0_PE))
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_GP);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set the lowest 4 bits */
|
|
State->ControlRegisters[FAST486_REG_CR0] &= 0xFFFFFFF0;
|
|
State->ControlRegisters[FAST486_REG_CR0] |= MachineStatusWord & 0x0F;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* INVLPG */
|
|
case 7:
|
|
{
|
|
UNIMPLEMENTED;
|
|
return FALSE;
|
|
}
|
|
|
|
/* Invalid */
|
|
default:
|
|
{
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroup0FB9)
|
|
{
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
|
|
|
|
TOGGLE_ADSIZE(AddressSize);
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* All of them are reserved (UD2) */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
FAST486_OPCODE_HANDLER(Fast486OpcodeGroup0FBA)
|
|
{
|
|
FAST486_MOD_REG_RM ModRegRm;
|
|
BOOLEAN OperandSize, AddressSize;
|
|
UINT DataSize;
|
|
UCHAR 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;
|
|
|
|
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Register < 4)
|
|
{
|
|
/* Invalid */
|
|
Fast486Exception(State, FAST486_EXCEPTION_UD);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Get the bit number */
|
|
if (!Fast486FetchByte(State, &BitNumber))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
if (ModRegRm.Memory)
|
|
{
|
|
/*
|
|
* For memory operands, add the bit offset divided by
|
|
* the data size to the address
|
|
*/
|
|
ModRegRm.MemoryAddress += BitNumber / DataSize;
|
|
}
|
|
|
|
/* Normalize the bit number */
|
|
BitNumber %= DataSize;
|
|
|
|
if (OperandSize)
|
|
{
|
|
ULONG Value;
|
|
|
|
/* Read the value */
|
|
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set CF to the bit value */
|
|
State->Flags.Cf = (Value >> BitNumber) & 1;
|
|
|
|
if (ModRegRm.Register == 5)
|
|
{
|
|
/* BTS */
|
|
Value |= 1 << BitNumber;
|
|
}
|
|
else if (ModRegRm.Register == 6)
|
|
{
|
|
/* BTR */
|
|
Value &= ~(1 << BitNumber);
|
|
}
|
|
else if (ModRegRm.Register == 7)
|
|
{
|
|
/* BTC */
|
|
Value ^= 1 << BitNumber;
|
|
}
|
|
|
|
if (ModRegRm.Register >= 5)
|
|
{
|
|
/* Write back the result */
|
|
if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
USHORT Value;
|
|
|
|
/* Read the value */
|
|
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
|
|
/* Set CF to the bit value */
|
|
State->Flags.Cf = (Value >> BitNumber) & 1;
|
|
|
|
if (ModRegRm.Register == 5)
|
|
{
|
|
/* BTS */
|
|
Value |= 1 << BitNumber;
|
|
}
|
|
else if (ModRegRm.Register == 6)
|
|
{
|
|
/* BTR */
|
|
Value &= ~(1 << BitNumber);
|
|
}
|
|
else if (ModRegRm.Register == 7)
|
|
{
|
|
/* BTC */
|
|
Value ^= 1 << BitNumber;
|
|
}
|
|
|
|
if (ModRegRm.Register >= 5)
|
|
{
|
|
/* Write back the result */
|
|
if (!Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value))
|
|
{
|
|
/* Exception occurred */
|
|
return FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Return success */
|
|
return TRUE;
|
|
}
|
|
|
|
/* EOF */
|