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reactos/lib/fast486/opcodes.c
Amine Khaldi e8103dd4d3 * Sync up to trunk head (r65298). 
svn path=/branches/shell-experiments/; revision=65299
2014-11-06 19:24:18 +00:00

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/*
* Fast486 386/486 CPU Emulation Library
* opcodes.c
*
* Copyright (C) 2014 Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* INCLUDES *******************************************************************/
#include <windef.h>
// #define NDEBUG
#include <debug.h>
#include <fast486.h>
#include "opcodes.h"
#include "opgroups.h"
#include "extraops.h"
#include "common.h"
#include "fpu.h"
/* PUBLIC VARIABLES ***********************************************************/
FAST486_OPCODE_HANDLER_PROC
Fast486OpcodeHandlers[FAST486_NUM_OPCODE_HANDLERS] =
{
Fast486OpcodeAddByteModrm, /* 0x00 - 0x03 */
Fast486OpcodeAddModrm,
Fast486OpcodeAddByteModrm,
Fast486OpcodeAddModrm,
Fast486OpcodeAddAl, /* 0x04 */
Fast486OpcodeAddEax, /* 0x05 */
Fast486OpcodePushEs, /* 0x06 */
Fast486OpcodePopEs, /* 0x07 */
Fast486OpcodeOrByteModrm, /* 0x08 - 0x0B */
Fast486OpcodeOrModrm,
Fast486OpcodeOrByteModrm,
Fast486OpcodeOrModrm,
Fast486OpcodeOrAl, /* 0x0C */
Fast486OpcodeOrEax, /* 0x0D */
Fast486OpcodePushCs, /* 0x0E */
Fast486OpcodeExtended, /* 0x0F */
Fast486OpcodeAdcByteModrm, /* 0x10 - 0x13 */
Fast486OpcodeAdcModrm,
Fast486OpcodeAdcByteModrm,
Fast486OpcodeAdcModrm,
Fast486OpcodeAdcAl, /* 0x14 */
Fast486OpcodeAdcEax, /* 0x15 */
Fast486OpcodePushSs, /* 0x16 */
Fast486OpcodePopSs, /* 0x17 */
Fast486OpcodeSbbByteModrm, /* 0x18 - 0x1B */
Fast486OpcodeSbbModrm,
Fast486OpcodeSbbByteModrm,
Fast486OpcodeSbbModrm,
Fast486OpcodeSbbAl, /* 0x1C */
Fast486OpcodeSbbEax, /* 0x1D */
Fast486OpcodePushDs, /* 0x1E */
Fast486OpcodePopDs, /* 0x1F */
Fast486OpcodeAndByteModrm, /* 0x20 - 0x23 */
Fast486OpcodeAndModrm,
Fast486OpcodeAndByteModrm,
Fast486OpcodeAndModrm,
Fast486OpcodeAndAl, /* 0x24 */
Fast486OpcodeAndEax, /* 0x25 */
Fast486OpcodePrefix, /* 0x26 */
Fast486OpcodeDaa, /* 0x27 */
Fast486OpcodeCmpSubByteModrm, /* 0x28 - 0x2B */
Fast486OpcodeCmpSubModrm,
Fast486OpcodeCmpSubByteModrm,
Fast486OpcodeCmpSubModrm,
Fast486OpcodeCmpSubAl, /* 0x2C */
Fast486OpcodeCmpSubEax, /* 0x2D */
Fast486OpcodePrefix, /* 0x2E */
Fast486OpcodeDas, /* 0x2F */
Fast486OpcodeXorByteModrm, /* 0x30 - 0x33 */
Fast486OpcodeXorModrm,
Fast486OpcodeXorByteModrm,
Fast486OpcodeXorModrm,
Fast486OpcodeXorAl, /* 0x34 */
Fast486OpcodeXorEax, /* 0x35 */
Fast486OpcodePrefix, /* 0x36 */
Fast486OpcodeAaa, /* 0x37 */
Fast486OpcodeCmpSubByteModrm, /* 0x38 - 0x3B */
Fast486OpcodeCmpSubModrm,
Fast486OpcodeCmpSubByteModrm,
Fast486OpcodeCmpSubModrm,
Fast486OpcodeCmpSubAl, /* 0x3C */
Fast486OpcodeCmpSubEax, /* 0x3D */
Fast486OpcodePrefix, /* 0x3E */
Fast486OpcodeAas, /* 0x3F */
Fast486OpcodeIncrement, /* 0x40 - 0x47 */
Fast486OpcodeIncrement,
Fast486OpcodeIncrement,
Fast486OpcodeIncrement,
Fast486OpcodeIncrement,
Fast486OpcodeIncrement,
Fast486OpcodeIncrement,
Fast486OpcodeIncrement,
Fast486OpcodeDecrement, /* 0x48 - 0x4F */
Fast486OpcodeDecrement,
Fast486OpcodeDecrement,
Fast486OpcodeDecrement,
Fast486OpcodeDecrement,
Fast486OpcodeDecrement,
Fast486OpcodeDecrement,
Fast486OpcodeDecrement,
Fast486OpcodePushReg, /* 0x50 - 0x57 */
Fast486OpcodePushReg,
Fast486OpcodePushReg,
Fast486OpcodePushReg,
Fast486OpcodePushReg,
Fast486OpcodePushReg,
Fast486OpcodePushReg,
Fast486OpcodePushReg,
Fast486OpcodePopReg, /* 0x58 - 0x5F */
Fast486OpcodePopReg,
Fast486OpcodePopReg,
Fast486OpcodePopReg,
Fast486OpcodePopReg,
Fast486OpcodePopReg,
Fast486OpcodePopReg,
Fast486OpcodePopReg,
Fast486OpcodePushAll, /* 0x60 */
Fast486OpcodePopAll, /* 0x61 */
Fast486OpcodeBound, /* 0x62 */
Fast486OpcodeArpl, /* 0x63 */
Fast486OpcodePrefix, /* 0x64 - 0x67 */
Fast486OpcodePrefix,
Fast486OpcodePrefix,
Fast486OpcodePrefix,
Fast486OpcodePushImm, /* 0x68 */
Fast486OpcodeImulModrmImm, /* 0x69 */
Fast486OpcodePushByteImm, /* 0x6A */
Fast486OpcodeImulModrmImm, /* 0x6B */
Fast486OpcodeIns, /* 0x6C */
Fast486OpcodeIns, /* 0x6D */
Fast486OpcodeOuts, /* 0x6E */
Fast486OpcodeOuts, /* 0x6F */
Fast486OpcodeShortConditionalJmp, /* 0x70 - 0x7F */
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeShortConditionalJmp,
Fast486OpcodeGroup8082, /* 0x80 */
Fast486OpcodeGroup81, /* 0x81 */
Fast486OpcodeGroup8082, /* 0x82 */
Fast486OpcodeGroup83, /* 0x83 */
Fast486OpcodeTestByteModrm, /* 0x84 */
Fast486OpcodeTestModrm, /* 0x85 */
Fast486OpcodeXchgByteModrm, /* 0x86 */
Fast486OpcodeXchgModrm, /* 0x87 */
Fast486OpcodeMovByteModrm, /* 0x88 */
Fast486OpcodeMovModrm, /* 0x89 */
Fast486OpcodeMovByteModrm, /* 0x8A */
Fast486OpcodeMovModrm, /* 0x8B */
Fast486OpcodeMovStoreSeg, /* 0x8C */
Fast486OpcodeLea, /* 0x8D */
Fast486OpcodeMovLoadSeg, /* 0x8E */
Fast486OpcodeGroup8F, /* 0x8F */
Fast486OpcodeNop, /* 0x90 */
Fast486OpcodeExchangeEax, /* 0x91 - 0x97 */
Fast486OpcodeExchangeEax,
Fast486OpcodeExchangeEax,
Fast486OpcodeExchangeEax,
Fast486OpcodeExchangeEax,
Fast486OpcodeExchangeEax,
Fast486OpcodeExchangeEax,
Fast486OpcodeCwde, /* 0x98 */
Fast486OpcodeCdq, /* 0x99 */
Fast486OpcodeCallAbs, /* 0x9A */
Fast486OpcodeWait, /* 0x9B */
Fast486OpcodePushFlags, /* 0x9C */
Fast486OpcodePopFlags, /* 0x9D */
Fast486OpcodeSahf, /* 0x9E */
Fast486OpcodeLahf, /* 0x9F */
Fast486OpcodeMovAlOffset, /* 0xA0 */
Fast486OpcodeMovEaxOffset, /* 0xA1 */
Fast486OpcodeMovOffsetAl, /* 0xA2 */
Fast486OpcodeMovOffsetEax, /* 0xA3 */
Fast486OpcodeMovs, /* 0xA4 */
Fast486OpcodeMovs, /* 0xA5 */
Fast486OpcodeCmps, /* 0xA6 */
Fast486OpcodeCmps, /* 0xA7 */
Fast486OpcodeTestAl, /* 0xA8 */
Fast486OpcodeTestEax, /* 0xA9 */
Fast486OpcodeStos, /* 0xAA */
Fast486OpcodeStos, /* 0xAB */
Fast486OpcodeLods, /* 0xAC */
Fast486OpcodeLods, /* 0xAD */
Fast486OpcodeScas, /* 0xAE */
Fast486OpcodeScas, /* 0xAF */
Fast486OpcodeMovByteRegImm, /* 0xB0 - 0xB7 */
Fast486OpcodeMovByteRegImm,
Fast486OpcodeMovByteRegImm,
Fast486OpcodeMovByteRegImm,
Fast486OpcodeMovByteRegImm,
Fast486OpcodeMovByteRegImm,
Fast486OpcodeMovByteRegImm,
Fast486OpcodeMovByteRegImm,
Fast486OpcodeMovRegImm, /* 0xB8 - 0xBF */
Fast486OpcodeMovRegImm,
Fast486OpcodeMovRegImm,
Fast486OpcodeMovRegImm,
Fast486OpcodeMovRegImm,
Fast486OpcodeMovRegImm,
Fast486OpcodeMovRegImm,
Fast486OpcodeMovRegImm,
Fast486OpcodeGroupC0, /* 0xC0 */
Fast486OpcodeGroupC1, /* 0xC1 */
Fast486OpcodeRet, /* 0xC2 */
Fast486OpcodeRet, /* 0xC3 */
Fast486OpcodeLdsLes, /* 0xC4 */
Fast486OpcodeLdsLes, /* 0xC5 */
Fast486OpcodeGroupC6, /* 0xC6 */
Fast486OpcodeGroupC7, /* 0xC7 */
Fast486OpcodeEnter, /* 0xC8 */
Fast486OpcodeLeave, /* 0xC9 */
Fast486OpcodeRetFar, /* 0xCA */
Fast486OpcodeRetFar, /* 0xCB */
Fast486OpcodeInt, /* 0xCC */
Fast486OpcodeInt, /* 0xCD */
Fast486OpcodeInt, /* 0xCE */
Fast486OpcodeIret, /* 0xCF */
Fast486OpcodeGroupD0, /* 0xD0 - 0xD3 */
Fast486OpcodeGroupD1,
Fast486OpcodeGroupD2,
Fast486OpcodeGroupD3,
Fast486OpcodeAam, /* 0xD4 */
Fast486OpcodeAad, /* 0xD5 */
Fast486OpcodeSalc, /* 0xD6 */
Fast486OpcodeXlat, /* 0xD7 */
Fast486FpuOpcodeD8DC, /* 0xD8 - 0xDF */
Fast486FpuOpcodeD9,
Fast486FpuOpcodeDA,
Fast486FpuOpcodeDB,
Fast486FpuOpcodeD8DC,
Fast486FpuOpcodeDD,
Fast486FpuOpcodeDE,
Fast486FpuOpcodeDF,
Fast486OpcodeLoop, /* 0xE0 - 0xE2 */
Fast486OpcodeLoop,
Fast486OpcodeLoop,
Fast486OpcodeJecxz, /* 0xE3 */
Fast486OpcodeInByte, /* 0xE4 */
Fast486OpcodeIn, /* 0xE5 */
Fast486OpcodeOutByte, /* 0xE6 */
Fast486OpcodeOut, /* 0xE7 */
Fast486OpcodeCall, /* 0xE8 */
Fast486OpcodeJmp, /* 0xE9 */
Fast486OpcodeJmpAbs, /* 0xEA */
Fast486OpcodeShortJump, /* 0xEB */
Fast486OpcodeInByte, /* 0xEC */
Fast486OpcodeIn, /* 0xED */
Fast486OpcodeOutByte, /* 0xEE */
Fast486OpcodeOut, /* 0xEF */
Fast486OpcodePrefix, /* 0xF0 */
Fast486OpcodeInvalid, /* 0xF1 */ // Invalid opcode -- ICEBP/INT01 opcode
Fast486OpcodePrefix, /* 0xF2 */
Fast486OpcodePrefix, /* 0xF3 */
Fast486OpcodeHalt, /* 0xF4 */
Fast486OpcodeComplCarry, /* 0xF5 */
Fast486OpcodeGroupF6, /* 0xF6 */
Fast486OpcodeGroupF7, /* 0xF7 */
Fast486OpcodeClearCarry, /* 0xF8 */
Fast486OpcodeSetCarry, /* 0xF9 */
Fast486OpcodeClearInt, /* 0xFA */
Fast486OpcodeSetInt, /* 0xFB */
Fast486OpcodeClearDir, /* 0xFC */
Fast486OpcodeSetDir, /* 0xFD */
Fast486OpcodeGroupFE, /* 0xFE */
Fast486OpcodeGroupFF, /* 0xFF */
};
/* PUBLIC FUNCTIONS ***********************************************************/
FAST486_OPCODE_HANDLER(Fast486OpcodeInvalid)
{
/*
* This is not a valid opcode.
* Well, not totally: see http://www.rcollins.org/secrets/opcodes/ICEBP.html
* for more details.
*/
DPRINT1("FAST486 -- Calling ICEBP opcode\n");
Fast486Exception(State, FAST486_EXCEPTION_UD);
}
FAST486_OPCODE_HANDLER(Fast486OpcodePrefix)
{
BOOLEAN Valid = FALSE;
switch (Opcode)
{
/* ES: */
case 0x26:
{
if (!(State->PrefixFlags & FAST486_PREFIX_SEG))
{
State->PrefixFlags |= FAST486_PREFIX_SEG;
State->SegmentOverride = FAST486_REG_ES;
Valid = TRUE;
}
break;
}
/* CS: */
case 0x2E:
{
if (!(State->PrefixFlags & FAST486_PREFIX_SEG))
{
State->PrefixFlags |= FAST486_PREFIX_SEG;
State->SegmentOverride = FAST486_REG_CS;
Valid = TRUE;
}
break;
}
/* SS: */
case 0x36:
{
if (!(State->PrefixFlags & FAST486_PREFIX_SEG))
{
State->PrefixFlags |= FAST486_PREFIX_SEG;
State->SegmentOverride = FAST486_REG_SS;
Valid = TRUE;
}
break;
}
/* DS: */
case 0x3E:
{
if (!(State->PrefixFlags & FAST486_PREFIX_SEG))
{
State->PrefixFlags |= FAST486_PREFIX_SEG;
State->SegmentOverride = FAST486_REG_DS;
Valid = TRUE;
}
break;
}
/* FS: */
case 0x64:
{
if (!(State->PrefixFlags & FAST486_PREFIX_SEG))
{
State->PrefixFlags |= FAST486_PREFIX_SEG;
State->SegmentOverride = FAST486_REG_FS;
Valid = TRUE;
}
break;
}
/* GS: */
case 0x65:
{
if (!(State->PrefixFlags & FAST486_PREFIX_SEG))
{
State->PrefixFlags |= FAST486_PREFIX_SEG;
State->SegmentOverride = FAST486_REG_GS;
Valid = TRUE;
}
break;
}
/* OPSIZE */
case 0x66:
{
if (!(State->PrefixFlags & FAST486_PREFIX_OPSIZE))
{
State->PrefixFlags |= FAST486_PREFIX_OPSIZE;
Valid = TRUE;
}
break;
}
/* ADSIZE */
case 0x67:
{
if (!(State->PrefixFlags & FAST486_PREFIX_ADSIZE))
{
State->PrefixFlags |= FAST486_PREFIX_ADSIZE;
Valid = TRUE;
}
break;
}
/* LOCK */
case 0xF0:
{
if (!(State->PrefixFlags & FAST486_PREFIX_LOCK))
{
State->PrefixFlags |= FAST486_PREFIX_LOCK;
Valid = TRUE;
}
break;
}
/* REPNZ */
case 0xF2:
{
/* Mutually exclusive with REP */
if (!(State->PrefixFlags
& (FAST486_PREFIX_REPNZ | FAST486_PREFIX_REP)))
{
State->PrefixFlags |= FAST486_PREFIX_REPNZ;
Valid = TRUE;
}
break;
}
/* REP / REPZ */
case 0xF3:
{
/* Mutually exclusive with REPNZ */
if (!(State->PrefixFlags
& (FAST486_PREFIX_REPNZ | FAST486_PREFIX_REP)))
{
State->PrefixFlags |= FAST486_PREFIX_REP;
Valid = TRUE;
}
break;
}
}
if (!Valid)
{
/* Clear all prefixes */
State->PrefixFlags = 0;
/* Throw an exception */
Fast486Exception(State, FAST486_EXCEPTION_UD);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeIncrement)
{
ULONG Value;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF8) == 0x40);
if (Size)
{
Value = ++State->GeneralRegs[Opcode & 0x07].Long;
State->Flags.Of = (Value == SIGN_FLAG_LONG);
State->Flags.Sf = ((Value & SIGN_FLAG_LONG) != 0);
}
else
{
Value = ++State->GeneralRegs[Opcode & 0x07].LowWord;
State->Flags.Of = (Value == SIGN_FLAG_WORD);
State->Flags.Sf = ((Value & SIGN_FLAG_WORD) != 0);
}
State->Flags.Zf = (Value == 0);
State->Flags.Af = ((Value & 0x0F) == 0);
State->Flags.Pf = Fast486CalculateParity(LOBYTE(Value));
}
FAST486_OPCODE_HANDLER(Fast486OpcodeDecrement)
{
ULONG Value;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF8) == 0x48);
if (Size)
{
Value = --State->GeneralRegs[Opcode & 0x07].Long;
State->Flags.Of = (Value == (SIGN_FLAG_LONG - 1));
State->Flags.Sf = ((Value & SIGN_FLAG_LONG) != 0);
}
else
{
Value = --State->GeneralRegs[Opcode & 0x07].LowWord;
State->Flags.Of = (Value == (SIGN_FLAG_WORD - 1));
State->Flags.Sf = ((Value & SIGN_FLAG_WORD) != 0);
}
State->Flags.Zf = (Value == 0);
State->Flags.Af = ((Value & 0x0F) == 0x0F);
State->Flags.Pf = Fast486CalculateParity(LOBYTE(Value));
}
FAST486_OPCODE_HANDLER(Fast486OpcodePushReg)
{
NO_LOCK_PREFIX();
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF8) == 0x50);
/* Call the internal function */
Fast486StackPush(State, State->GeneralRegs[Opcode & 0x07].Long);
}
FAST486_OPCODE_HANDLER(Fast486OpcodePopReg)
{
ULONG Value;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF8) == 0x58);
/* Call the internal function */
if (!Fast486StackPop(State, &Value)) return;
/* Store the value */
if (Size) State->GeneralRegs[Opcode & 0x07].Long = Value;
else State->GeneralRegs[Opcode & 0x07].LowWord = Value;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeNop)
{
}
FAST486_OPCODE_HANDLER(Fast486OpcodeExchangeEax)
{
INT Reg = Opcode & 0x07;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF8) == 0x90);
/* Exchange the values */
if (Size)
{
ULONG Value;
Value = State->GeneralRegs[Reg].Long;
State->GeneralRegs[Reg].Long = State->GeneralRegs[FAST486_REG_EAX].Long;
State->GeneralRegs[FAST486_REG_EAX].Long = Value;
}
else
{
USHORT Value;
Value = State->GeneralRegs[Reg].LowWord;
State->GeneralRegs[Reg].LowWord = State->GeneralRegs[FAST486_REG_EAX].LowWord;
State->GeneralRegs[FAST486_REG_EAX].LowWord = Value;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeShortConditionalJmp)
{
BOOLEAN Jump = FALSE;
CHAR Offset = 0;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF0) == 0x70);
TOGGLE_OPSIZE(Size);
/* Fetch the offset */
if (!Fast486FetchByte(State, (PUCHAR)&Offset))
{
/* An exception occurred */
return;
}
switch ((Opcode & 0x0F) >> 1)
{
/* JO / JNO */
case 0:
{
Jump = State->Flags.Of;
break;
}
/* JC / JNC */
case 1:
{
Jump = State->Flags.Cf;
break;
}
/* JZ / JNZ */
case 2:
{
Jump = State->Flags.Zf;
break;
}
/* JBE / JNBE */
case 3:
{
Jump = State->Flags.Cf || State->Flags.Zf;
break;
}
/* JS / JNS */
case 4:
{
Jump = State->Flags.Sf;
break;
}
/* JP / JNP */
case 5:
{
Jump = State->Flags.Pf;
break;
}
/* JL / JNL */
case 6:
{
Jump = State->Flags.Sf != State->Flags.Of;
break;
}
/* JLE / JNLE */
case 7:
{
Jump = (State->Flags.Sf != State->Flags.Of) || State->Flags.Zf;
break;
}
}
if (Opcode & 1)
{
/* Invert the result */
Jump = !Jump;
}
if (Jump)
{
/* Move the instruction pointer */
State->InstPtr.Long += Offset;
if (!Size)
{
/* Clear the top half of EIP */
State->InstPtr.Long &= 0xFFFF;
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeClearCarry)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xF8);
/* No prefixes allowed */
if (State->PrefixFlags)
{
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Clear CF and return success */
State->Flags.Cf = FALSE;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeSetCarry)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xF9);
/* No prefixes allowed */
if (State->PrefixFlags)
{
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Set CF and return success*/
State->Flags.Cf = TRUE;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeComplCarry)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xF5);
/* No prefixes allowed */
if (State->PrefixFlags)
{
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Toggle CF and return success */
State->Flags.Cf = !State->Flags.Cf;
return;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeClearInt)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xFA);
/* No prefixes allowed */
if (State->PrefixFlags)
{
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Check for protected mode */
if (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
{
/* Check IOPL */
if (State->Flags.Iopl >= State->SegmentRegs[FAST486_REG_CS].Dpl)
{
/* Clear the interrupt flag */
State->Flags.If = FALSE;
}
else
{
/* General Protection Fault */
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
}
else
{
/* Just clear the interrupt flag */
State->Flags.If = FALSE;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeSetInt)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xFB);
/* No prefixes allowed */
if (State->PrefixFlags)
{
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Check for protected mode */
if (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
{
/* Check IOPL */
if (State->Flags.Iopl >= State->SegmentRegs[FAST486_REG_CS].Dpl)
{
/* Set the interrupt flag */
State->Flags.If = TRUE;
}
else
{
/* General Protection Fault */
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
}
else
{
/* Just set the interrupt flag */
State->Flags.If = TRUE;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeClearDir)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xFC);
/* No prefixes allowed */
if (State->PrefixFlags)
{
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Clear DF */
State->Flags.Df = FALSE;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeSetDir)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xFD);
/* No prefixes allowed */
if (State->PrefixFlags)
{
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Set DF */
State->Flags.Df = TRUE;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeHalt)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xF4);
/* No prefixes allowed */
if (State->PrefixFlags)
{
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Privileged instructions can only be executed under CPL = 0 */
if (State->SegmentRegs[FAST486_REG_CS].Dpl != 0)
{
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
/* Halt */
State->Halted = TRUE;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeInByte)
{
UCHAR Data;
ULONG Port;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF7) == 0xE4);
if (Opcode == 0xE4)
{
/* Fetch the parameter */
if (!Fast486FetchByte(State, &Data))
{
/* Exception occurred */
return;
}
/* Set the port number to the parameter */
Port = Data;
}
else
{
/* The port number is in DX */
Port = State->GeneralRegs[FAST486_REG_EDX].LowWord;
}
/* Read a byte from the I/O port */
State->IoReadCallback(State, Port, &Data, 1, sizeof(UCHAR));
/* Store the result in AL */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Data;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeIn)
{
ULONG Port;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF7) == 0xE5);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
if (Opcode == 0xE5)
{
UCHAR Data;
/* Fetch the parameter */
if (!Fast486FetchByte(State, &Data))
{
/* Exception occurred */
return;
}
/* Set the port number to the parameter */
Port = Data;
}
else
{
/* The port number is in DX */
Port = State->GeneralRegs[FAST486_REG_EDX].LowWord;
}
if (Size)
{
ULONG Data;
/* Read a dword from the I/O port */
State->IoReadCallback(State, Port, &Data, 1, sizeof(ULONG));
/* Store the value in EAX */
State->GeneralRegs[FAST486_REG_EAX].Long = Data;
}
else
{
USHORT Data;
/* Read a word from the I/O port */
State->IoReadCallback(State, Port, &Data, 1, sizeof(USHORT));
/* Store the value in AX */
State->GeneralRegs[FAST486_REG_EAX].LowWord = Data;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeOutByte)
{
UCHAR Data;
ULONG Port;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF7) == 0xE6);
if (Opcode == 0xE6)
{
/* Fetch the parameter */
if (!Fast486FetchByte(State, &Data))
{
/* Exception occurred */
return;
}
/* Set the port number to the parameter */
Port = Data;
}
else
{
/* The port number is in DX */
Port = State->GeneralRegs[FAST486_REG_EDX].LowWord;
}
/* Read the value from AL */
Data = State->GeneralRegs[FAST486_REG_EAX].LowByte;
/* Write the byte to the I/O port */
State->IoWriteCallback(State, Port, &Data, 1, sizeof(UCHAR));
}
FAST486_OPCODE_HANDLER(Fast486OpcodeOut)
{
ULONG Port;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF7) == 0xE7);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
if (Opcode == 0xE7)
{
UCHAR Data;
/* Fetch the parameter */
if (!Fast486FetchByte(State, &Data))
{
/* Exception occurred */
return;
}
/* Set the port number to the parameter */
Port = Data;
}
else
{
/* The port number is in DX */
Port = State->GeneralRegs[FAST486_REG_EDX].LowWord;
}
if (Size)
{
/* Get the value from EAX */
ULONG Data = State->GeneralRegs[FAST486_REG_EAX].Long;
/* Write a dword to the I/O port */
State->IoWriteCallback(State, Port, &Data, 1, sizeof(ULONG));
}
else
{
/* Get the value from AX */
USHORT Data = State->GeneralRegs[FAST486_REG_EAX].LowWord;
/* Write a word to the I/O port */
State->IoWriteCallback(State, Port, &Data, 1, sizeof(USHORT));
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeShortJump)
{
CHAR Offset = 0;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(Size);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xEB);
/* Fetch the offset */
if (!Fast486FetchByte(State, (PUCHAR)&Offset))
{
/* An exception occurred */
return;
}
/* Move the instruction pointer */
State->InstPtr.Long += Offset;
if (!Size)
{
/* Clear the top half of EIP */
State->InstPtr.Long &= 0xFFFF;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovRegImm)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF8) == 0xB8);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
if (Size)
{
ULONG Value;
/* Fetch the dword */
if (!Fast486FetchDword(State, &Value))
{
/* Exception occurred */
return;
}
/* Store the value in the register */
State->GeneralRegs[Opcode & 0x07].Long = Value;
}
else
{
USHORT Value;
/* Fetch the word */
if (!Fast486FetchWord(State, &Value))
{
/* Exception occurred */
return;
}
/* Store the value in the register */
State->GeneralRegs[Opcode & 0x07].LowWord = Value;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovByteRegImm)
{
UCHAR Value;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF8) == 0xB0);
if (State->PrefixFlags != 0)
{
/* Invalid prefix */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Fetch the byte */
if (!Fast486FetchByte(State, &Value))
{
/* Exception occurred */
return;
}
if (Opcode & 0x04)
{
/* AH, CH, DH or BH */
State->GeneralRegs[Opcode & 0x03].HighByte = Value;
}
else
{
/* AL, CL, DL or BL */
State->GeneralRegs[Opcode & 0x03].LowByte = Value;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAddByteModrm)
{
UCHAR FirstValue, SecondValue, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x00);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue;
/* Update the flags */
State->Flags.Cf = (Result < FirstValue) && (Result < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_BYTE) == (SecondValue & SIGN_FLAG_BYTE))
&& ((FirstValue & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = ((((FirstValue & 0x0F) + (SecondValue & 0x0F)) & 0x10) != 0);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmByteOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAddModrm)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x01);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue;
/* Update the flags */
State->Flags.Cf = (Result < FirstValue) && (Result < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_LONG) == (SecondValue & SIGN_FLAG_LONG))
&& ((FirstValue & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = ((((FirstValue & 0x0F) + (SecondValue & 0x0F)) & 0x10) != 0);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue;
/* Update the flags */
State->Flags.Cf = (Result < FirstValue) && (Result < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_WORD) == (SecondValue & SIGN_FLAG_WORD))
&& ((FirstValue & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = ((((FirstValue & 0x0F) + (SecondValue & 0x0F)) & 0x10) != 0);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmWordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAddAl)
{
UCHAR FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowByte;
UCHAR SecondValue, Result;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x04);
if (State->PrefixFlags)
{
/* This opcode doesn't take any prefixes */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (!Fast486FetchByte(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue;
/* Update the flags */
State->Flags.Cf = (Result < FirstValue) && (Result < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_BYTE) == (SecondValue & SIGN_FLAG_BYTE))
&& ((FirstValue & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = ((((FirstValue & 0x0F) + (SecondValue & 0x0F)) & 0x10) != 0);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Result;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAddEax)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x05);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
{
ULONG FirstValue = State->GeneralRegs[FAST486_REG_EAX].Long;
ULONG SecondValue, Result;
if (!Fast486FetchDword(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue;
/* Update the flags */
State->Flags.Cf = (Result < FirstValue) && (Result < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_LONG) == (SecondValue & SIGN_FLAG_LONG))
&& ((FirstValue & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = ((((FirstValue & 0x0F) + (SecondValue & 0x0F)) & 0x10) != 0);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].Long = Result;
}
else
{
USHORT FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowWord;
USHORT SecondValue, Result;
if (!Fast486FetchWord(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue;
/* Update the flags */
State->Flags.Cf = (Result < FirstValue) && (Result < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_WORD) == (SecondValue & SIGN_FLAG_WORD))
&& ((FirstValue & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = ((((FirstValue & 0x0F) + (SecondValue & 0x0F)) & 0x10) != 0);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowWord = Result;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeOrByteModrm)
{
UCHAR FirstValue, SecondValue, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x08);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue | SecondValue;
/* 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);
/* Write back the result */
Fast486WriteModrmByteOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeOrModrm)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x09);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue | SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue | SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmWordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeOrAl)
{
UCHAR FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowByte;
UCHAR SecondValue, Result;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x0C);
if (State->PrefixFlags)
{
/* This opcode doesn't take any prefixes */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (!Fast486FetchByte(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue | SecondValue;
/* 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);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Result;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeOrEax)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x0D);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
{
ULONG FirstValue = State->GeneralRegs[FAST486_REG_EAX].Long;
ULONG SecondValue, Result;
if (!Fast486FetchDword(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue | SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].Long = Result;
}
else
{
USHORT FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowWord;
USHORT SecondValue, Result;
if (!Fast486FetchWord(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue | SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowWord = Result;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAndByteModrm)
{
UCHAR FirstValue, SecondValue, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x20);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* 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);
/* Write back the result */
Fast486WriteModrmByteOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAndModrm)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x21);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmWordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAndAl)
{
UCHAR FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowByte;
UCHAR SecondValue, Result;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x24);
NO_LOCK_PREFIX();
if (!Fast486FetchByte(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* 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);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Result;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAndEax)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x25);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
{
ULONG FirstValue = State->GeneralRegs[FAST486_REG_EAX].Long;
ULONG SecondValue, Result;
if (!Fast486FetchDword(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].Long = Result;
}
else
{
USHORT FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowWord;
USHORT SecondValue, Result;
if (!Fast486FetchWord(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowWord = Result;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeXorByteModrm)
{
UCHAR FirstValue, SecondValue, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x30);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue ^ SecondValue;
/* 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);
/* Write back the result */
Fast486WriteModrmByteOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeXorModrm)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x31);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue ^ SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue ^ SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmWordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeXorAl)
{
UCHAR FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowByte;
UCHAR SecondValue, Result;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x34);
if (State->PrefixFlags)
{
/* This opcode doesn't take any prefixes */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (!Fast486FetchByte(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue ^ SecondValue;
/* 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);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Result;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeXorEax)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x35);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
{
ULONG FirstValue = State->GeneralRegs[FAST486_REG_EAX].Long;
ULONG SecondValue, Result;
if (!Fast486FetchDword(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue ^ SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].Long = Result;
}
else
{
USHORT FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowWord;
USHORT SecondValue, Result;
if (!Fast486FetchWord(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue ^ SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowWord = Result;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeTestByteModrm)
{
UCHAR FirstValue, SecondValue, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x84);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* 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);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeTestModrm)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x85);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeTestAl)
{
UCHAR FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowByte;
UCHAR SecondValue, Result;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xA8);
if (State->PrefixFlags)
{
/* This opcode doesn't take any prefixes */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (!Fast486FetchByte(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* 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);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeTestEax)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xA9);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
{
ULONG FirstValue = State->GeneralRegs[FAST486_REG_EAX].Long;
ULONG SecondValue, Result;
if (!Fast486FetchDword(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
}
else
{
USHORT FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowWord;
USHORT SecondValue, Result;
if (!Fast486FetchWord(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue & SecondValue;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeXchgByteModrm)
{
UCHAR FirstValue, SecondValue;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x86);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Write the value from the register to the R/M */
if (!Fast486WriteModrmByteOperands(State,
&ModRegRm,
FALSE,
FirstValue))
{
/* Exception occurred */
return;
}
/* Write the value from the R/M to the register */
Fast486WriteModrmByteOperands(State,
&ModRegRm,
TRUE,
SecondValue);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeXchgModrm)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x87);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Write the value from the register to the R/M */
if (!Fast486WriteModrmDwordOperands(State,
&ModRegRm,
FALSE,
FirstValue))
{
/* Exception occurred */
return;
}
/* Write the value from the R/M to the register */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
SecondValue);
}
else
{
USHORT FirstValue, SecondValue;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Write the value from the register to the R/M */
if (!Fast486WriteModrmWordOperands(State,
&ModRegRm,
FALSE,
FirstValue))
{
/* Exception occurred */
return;
}
/* Write the value from the R/M to the register */
Fast486WriteModrmWordOperands(State,
&ModRegRm,
TRUE,
SecondValue);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodePushEs)
{
/* Call the internal API */
Fast486StackPush(State, State->SegmentRegs[FAST486_REG_ES].Selector);
}
FAST486_OPCODE_HANDLER(Fast486OpcodePopEs)
{
ULONG NewSelector;
if (!Fast486StackPop(State, &NewSelector))
{
/* Exception occurred */
return;
}
/* Call the internal API */
Fast486LoadSegment(State, FAST486_REG_ES, LOWORD(NewSelector));
}
FAST486_OPCODE_HANDLER(Fast486OpcodePushCs)
{
/* Call the internal API */
Fast486StackPush(State, State->SegmentRegs[FAST486_REG_CS].Selector);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAdcByteModrm)
{
UCHAR FirstValue, SecondValue, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x10);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue + State->Flags.Cf;
/* Special exception for CF */
State->Flags.Cf = State->Flags.Cf
&& ((FirstValue == 0xFF) || (SecondValue == 0xFF));
/* Update the flags */
State->Flags.Cf = State->Flags.Cf || ((Result < FirstValue) && (Result < SecondValue));
State->Flags.Of = ((FirstValue & SIGN_FLAG_BYTE) == (SecondValue & SIGN_FLAG_BYTE))
&& ((FirstValue & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmByteOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAdcModrm)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x11);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue + State->Flags.Cf;
/* Special exception for CF */
State->Flags.Cf = State->Flags.Cf
&& ((FirstValue == 0xFFFFFFFF) || (SecondValue == 0xFFFFFFFF));
/* Update the flags */
State->Flags.Cf = State->Flags.Cf || ((Result < FirstValue) && (Result < SecondValue));
State->Flags.Of = ((FirstValue & SIGN_FLAG_LONG) == (SecondValue & SIGN_FLAG_LONG))
&& ((FirstValue & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue + State->Flags.Cf;
/* Special exception for CF */
State->Flags.Cf = State->Flags.Cf
&& ((FirstValue == 0xFFFF) || (SecondValue == 0xFFFF));
/* Update the flags */
State->Flags.Cf = State->Flags.Cf || ((Result < FirstValue) && (Result < SecondValue));
State->Flags.Of = ((FirstValue & SIGN_FLAG_WORD) == (SecondValue & SIGN_FLAG_WORD))
&& ((FirstValue & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmWordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAdcAl)
{
UCHAR FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowByte;
UCHAR SecondValue, Result;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x14);
if (State->PrefixFlags)
{
/* This opcode doesn't take any prefixes */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (!Fast486FetchByte(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue + State->Flags.Cf;
/* Special exception for CF */
State->Flags.Cf = State->Flags.Cf &&
((FirstValue == 0xFF) || (SecondValue == 0xFF));
/* Update the flags */
State->Flags.Cf = State->Flags.Cf || ((Result < FirstValue) && (Result < SecondValue));
State->Flags.Of = ((FirstValue & SIGN_FLAG_BYTE) == (SecondValue & SIGN_FLAG_BYTE))
&& ((FirstValue & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Result;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAdcEax)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x15);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
{
ULONG FirstValue = State->GeneralRegs[FAST486_REG_EAX].Long;
ULONG SecondValue, Result;
if (!Fast486FetchDword(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue + State->Flags.Cf;
/* Special exception for CF */
State->Flags.Cf = State->Flags.Cf &&
((FirstValue == 0xFFFFFFFF) || (SecondValue == 0xFFFFFFFF));
/* Update the flags */
State->Flags.Cf = State->Flags.Cf || ((Result < FirstValue) && (Result < SecondValue));
State->Flags.Of = ((FirstValue & SIGN_FLAG_LONG) == (SecondValue & SIGN_FLAG_LONG))
&& ((FirstValue & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].Long = Result;
}
else
{
USHORT FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowWord;
USHORT SecondValue, Result;
if (!Fast486FetchWord(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue + SecondValue + State->Flags.Cf;
/* Special exception for CF */
State->Flags.Cf = State->Flags.Cf &&
((FirstValue == 0xFFFF) || (SecondValue == 0xFFFF));
/* Update the flags */
State->Flags.Cf = State->Flags.Cf || ((Result < FirstValue) && (Result < SecondValue));
State->Flags.Of = ((FirstValue & SIGN_FLAG_WORD) == (SecondValue & SIGN_FLAG_WORD))
&& ((FirstValue & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowWord = Result;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodePushSs)
{
/* Call the internal API */
Fast486StackPush(State, State->SegmentRegs[FAST486_REG_SS].Selector);
}
FAST486_OPCODE_HANDLER(Fast486OpcodePopSs)
{
ULONG NewSelector;
if (!Fast486StackPop(State, &NewSelector))
{
/* Exception occurred */
return;
}
/* Call the internal API */
if (Fast486LoadSegment(State, FAST486_REG_SS, LOWORD(NewSelector)))
{
/* Inhibit all interrupts until the next instruction */
State->DoNotInterrupt = TRUE;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeSbbByteModrm)
{
UCHAR FirstValue, SecondValue, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
INT Carry = State->Flags.Cf ? 1 : 0;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x18);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Check if this is the instruction that writes to R/M */
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
Result = FirstValue - SecondValue - Carry;
/* Update the flags */
State->Flags.Cf = Carry ? (FirstValue <= SecondValue) : (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_BYTE) != (SecondValue & SIGN_FLAG_BYTE))
&& ((FirstValue & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmByteOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeSbbModrm)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
INT Carry = State->Flags.Cf ? 1 : 0;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x19);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Check if this is the instruction that writes to R/M */
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
Result = FirstValue - SecondValue - Carry;
/* Update the flags */
State->Flags.Cf = Carry ? (FirstValue <= SecondValue) : (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_LONG) != (SecondValue & SIGN_FLAG_LONG))
&& ((FirstValue & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Check if this is the instruction that writes to R/M */
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
Result = FirstValue - SecondValue - Carry;
/* Update the flags */
State->Flags.Cf = Carry ? (FirstValue <= SecondValue) : (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_WORD) != (SecondValue & SIGN_FLAG_WORD))
&& ((FirstValue & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmWordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeSbbAl)
{
UCHAR FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowByte;
UCHAR SecondValue, Result;
INT Carry = State->Flags.Cf ? 1 : 0;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x1C);
if (State->PrefixFlags)
{
/* This opcode doesn't take any prefixes */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (!Fast486FetchByte(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue - SecondValue - Carry;
/* Update the flags */
State->Flags.Cf = Carry ? (FirstValue <= SecondValue) : (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_BYTE) != (SecondValue & SIGN_FLAG_BYTE))
&& ((FirstValue & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Result;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeSbbEax)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
INT Carry = State->Flags.Cf ? 1 : 0;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x1D);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
{
ULONG FirstValue = State->GeneralRegs[FAST486_REG_EAX].Long;
ULONG SecondValue, Result;
if (!Fast486FetchDword(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue - SecondValue - Carry;
/* Update the flags */
State->Flags.Cf = Carry ? (FirstValue <= SecondValue) : (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_LONG) != (SecondValue & SIGN_FLAG_LONG))
&& ((FirstValue & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].Long = Result;
}
else
{
USHORT FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowWord;
USHORT SecondValue, Result;
if (!Fast486FetchWord(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue - SecondValue - Carry;
/* Update the flags */
State->Flags.Cf = Carry ? (FirstValue <= SecondValue) : (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_WORD) != (SecondValue & SIGN_FLAG_WORD))
&& ((FirstValue & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = ((FirstValue ^ SecondValue ^ Result) & 0x10) != 0;
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowWord = Result;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodePushDs)
{
/* Call the internal API */
Fast486StackPush(State, State->SegmentRegs[FAST486_REG_DS].Selector);
}
FAST486_OPCODE_HANDLER(Fast486OpcodePopDs)
{
ULONG NewSelector;
if (!Fast486StackPop(State, &NewSelector))
{
/* Exception occurred */
return;
}
/* Call the internal API */
Fast486LoadSegment(State, FAST486_REG_DS, LOWORD(NewSelector));
}
FAST486_OPCODE_HANDLER(Fast486OpcodeDaa)
{
UCHAR Value = State->GeneralRegs[FAST486_REG_EAX].LowByte;
BOOLEAN Carry = State->Flags.Cf;
/* Clear the carry flag */
State->Flags.Cf = FALSE;
/* Check if the first BCD digit is invalid or there was a carry from it */
if (((Value & 0x0F) > 9) || State->Flags.Af)
{
/* Correct it */
State->GeneralRegs[FAST486_REG_EAX].LowByte += 0x06;
if (State->GeneralRegs[FAST486_REG_EAX].LowByte < 0x06)
{
/* A carry occurred */
State->Flags.Cf = TRUE;
}
/* Set the adjust flag */
State->Flags.Af = TRUE;
}
/* Check if the second BCD digit is invalid or there was a carry from it */
if ((Value > 0x99) || Carry)
{
/* Correct it */
State->GeneralRegs[FAST486_REG_EAX].LowByte += 0x60;
/* There was a carry */
State->Flags.Cf = TRUE;
}
Value = State->GeneralRegs[FAST486_REG_EAX].LowByte;
/* Update the flags */
State->Flags.Sf = (Value & SIGN_FLAG_BYTE) != 0;
State->Flags.Zf = (Value == 0);
State->Flags.Pf = Fast486CalculateParity(Value);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeCmpSubByteModrm)
{
UCHAR FirstValue, SecondValue, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xED) == 0x28);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Check if this is the instruction that writes to R/M */
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
Result = FirstValue - SecondValue;
/* Update the flags */
State->Flags.Cf = (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_BYTE) != (SecondValue & SIGN_FLAG_BYTE))
&& ((FirstValue & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = (FirstValue & 0x0F) < (SecondValue & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Check if this is not a CMP */
if (!(Opcode & 0x10))
{
/* Write back the result */
Fast486WriteModrmByteOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeCmpSubModrm)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xED) == 0x29);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Check if this is the instruction that writes to R/M */
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
Result = FirstValue - SecondValue;
/* Update the flags */
State->Flags.Cf = (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_LONG) != (SecondValue & SIGN_FLAG_LONG))
&& ((FirstValue & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = (FirstValue & 0x0F) < (SecondValue & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Check if this is not a CMP */
if (!(Opcode & 0x10))
{
/* Write back the result */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Check if this is the instruction that writes to R/M */
if (!(Opcode & FAST486_OPCODE_WRITE_REG))
{
/* Swap the order */
SWAP(FirstValue, SecondValue);
}
/* Calculate the result */
Result = FirstValue - SecondValue;
/* Update the flags */
State->Flags.Cf = (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_WORD) != (SecondValue & SIGN_FLAG_WORD))
&& ((FirstValue & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = (FirstValue & 0x0F) < (SecondValue & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Check if this is not a CMP */
if (!(Opcode & 0x10))
{
/* Write back the result */
Fast486WriteModrmWordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeCmpSubAl)
{
UCHAR FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowByte;
UCHAR SecondValue, Result;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xEF) == 0x2C);
if (State->PrefixFlags)
{
/* This opcode doesn't take any prefixes */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (!Fast486FetchByte(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue - SecondValue;
/* Update the flags */
State->Flags.Cf = (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_BYTE) != (SecondValue & SIGN_FLAG_BYTE))
&& ((FirstValue & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = (FirstValue & 0x0F) < (SecondValue & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Check if this is not a CMP */
if (!(Opcode & 0x10))
{
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Result;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeCmpSubEax)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xEF) == 0x2D);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
{
ULONG FirstValue = State->GeneralRegs[FAST486_REG_EAX].Long;
ULONG SecondValue, Result;
if (!Fast486FetchDword(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue - SecondValue;
/* Update the flags */
State->Flags.Cf = (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_LONG) != (SecondValue & SIGN_FLAG_LONG))
&& ((FirstValue & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = (FirstValue & 0x0F) < (SecondValue & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Check if this is not a CMP */
if (!(Opcode & 0x10))
{
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].Long = Result;
}
}
else
{
USHORT FirstValue = State->GeneralRegs[FAST486_REG_EAX].LowWord;
USHORT SecondValue, Result;
if (!Fast486FetchWord(State, &SecondValue))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = FirstValue - SecondValue;
/* Update the flags */
State->Flags.Cf = (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SIGN_FLAG_WORD) != (SecondValue & SIGN_FLAG_WORD))
&& ((FirstValue & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = (FirstValue & 0x0F) < (SecondValue & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Check if this is not a CMP */
if (!(Opcode & 0x10))
{
/* Write back the result */
State->GeneralRegs[FAST486_REG_EAX].LowWord = Result;
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeDas)
{
UCHAR Value = State->GeneralRegs[FAST486_REG_EAX].LowByte;
BOOLEAN Carry = State->Flags.Cf;
/* Clear the carry flag */
State->Flags.Cf = FALSE;
/* Check if the first BCD digit is invalid or there was a borrow */
if (((Value & 0x0F) > 9) || State->Flags.Af)
{
/* Correct it */
State->GeneralRegs[FAST486_REG_EAX].LowByte -= 0x06;
if (State->GeneralRegs[FAST486_REG_EAX].LowByte > 0xFB)
{
/* A borrow occurred */
State->Flags.Cf = TRUE;
}
/* Set the adjust flag */
State->Flags.Af = TRUE;
}
/* Check if the second BCD digit is invalid or there was a borrow */
if ((Value > 0x99) || Carry)
{
/* Correct it */
State->GeneralRegs[FAST486_REG_EAX].LowByte -= 0x60;
/* There was a borrow */
State->Flags.Cf = TRUE;
}
Value = State->GeneralRegs[FAST486_REG_EAX].LowByte;
/* Update the flags */
State->Flags.Sf = (Value & SIGN_FLAG_BYTE) != 0;
State->Flags.Zf = (Value == 0);
State->Flags.Pf = Fast486CalculateParity(Value);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAaa)
{
UCHAR Value = State->GeneralRegs[FAST486_REG_EAX].LowByte;
/*
* Check if the value in AL is not a valid BCD digit,
* or there was a carry from the lowest 4 bits of AL
*/
if (((Value & 0x0F) > 9) || State->Flags.Af)
{
/* Correct it */
State->GeneralRegs[FAST486_REG_EAX].LowWord += 0x06;
State->GeneralRegs[FAST486_REG_EAX].HighByte++;
/* Set CF and AF */
State->Flags.Cf = State->Flags.Af = TRUE;
}
else
{
/* Clear CF and AF */
State->Flags.Cf = State->Flags.Af = FALSE;
}
/* Keep only the lowest 4 bits of AL */
State->GeneralRegs[FAST486_REG_EAX].LowByte &= 0x0F;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAas)
{
UCHAR Value = State->GeneralRegs[FAST486_REG_EAX].LowByte;
/*
* Check if the value in AL is not a valid BCD digit,
* or there was a borrow from the lowest 4 bits of AL
*/
if (((Value & 0x0F) > 9) || State->Flags.Af)
{
/* Correct it */
State->GeneralRegs[FAST486_REG_EAX].LowWord -= 0x06;
State->GeneralRegs[FAST486_REG_EAX].HighByte--;
/* Set CF and AF */
State->Flags.Cf = State->Flags.Af = TRUE;
}
else
{
/* Clear CF and AF */
State->Flags.Cf = State->Flags.Af = FALSE;
}
/* Keep only the lowest 4 bits of AL */
State->GeneralRegs[FAST486_REG_EAX].LowByte &= 0x0F;
}
FAST486_OPCODE_HANDLER(Fast486OpcodePushAll)
{
INT i;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_REG SavedEsp = State->GeneralRegs[FAST486_REG_ESP];
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x60);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
/* Push all the registers in order */
for (i = 0; i < FAST486_NUM_GEN_REGS; i++)
{
if (i == FAST486_REG_ESP)
{
/* Use the saved ESP instead */
if (!Fast486StackPush(State, Size ? SavedEsp.Long : SavedEsp.LowWord))
{
/* Exception occurred */
return;
}
}
else
{
/* Push the register */
if (!Fast486StackPush(State, Size ? State->GeneralRegs[i].Long
: State->GeneralRegs[i].LowWord))
{
/* Exception occurred */
return;
}
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodePopAll)
{
INT i;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
ULONG Value;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x61);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
/* Pop all the registers in reverse order */
for (i = FAST486_NUM_GEN_REGS - 1; i >= 0; i--)
{
/* Pop the value */
if (!Fast486StackPop(State, &Value))
{
/* Exception occurred */
return;
}
/* Don't modify ESP */
if (i != FAST486_REG_ESP)
{
if (Size) State->GeneralRegs[i].Long = Value;
else State->GeneralRegs[i].LowWord = LOWORD(Value);
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeBound)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
FAST486_SEG_REGS Segment = FAST486_REG_DS;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!ModRegRm.Memory)
{
/* Invalid */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Check for the segment override */
if (State->PrefixFlags & FAST486_PREFIX_SEG)
{
/* Use the override segment instead */
Segment = State->SegmentOverride;
}
if (OperandSize)
{
LONG Index, LowerBound, UpperBound;
/* Read the operands */
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
(PULONG)&Index,
(PULONG)&LowerBound))
{
/* Exception occurred */
return;
}
if (!Fast486ReadMemory(State,
Segment,
ModRegRm.MemoryAddress + sizeof(ULONG),
FALSE,
&UpperBound,
sizeof(ULONG)))
{
/* Exception occurred */
return;
}
if ((Index < LowerBound) || (Index > UpperBound))
{
/* Out of bounds */
Fast486Exception(State, FAST486_EXCEPTION_BR);
}
}
else
{
SHORT Index, LowerBound, UpperBound;
/* Read the operands */
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
(PUSHORT)&Index,
(PUSHORT)&LowerBound))
{
/* Exception occurred */
return;
}
if (!Fast486ReadMemory(State,
Segment,
ModRegRm.MemoryAddress + sizeof(USHORT),
FALSE,
&UpperBound,
sizeof(USHORT)))
{
/* Exception occurred */
return;
}
if ((Index < LowerBound) || (Index > UpperBound))
{
/* Out of bounds */
Fast486Exception(State, FAST486_EXCEPTION_BR);
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeArpl)
{
USHORT FirstValue, SecondValue;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
|| State->Flags.Vm
|| (State->PrefixFlags & FAST486_PREFIX_LOCK))
{
/* Cannot be used in real mode or with a LOCK prefix */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Read the operands */
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
/* Check if the RPL needs adjusting */
if ((SecondValue & 3) < (FirstValue & 3))
{
/* Adjust the RPL */
SecondValue &= ~3;
SecondValue |= FirstValue & 3;
/* Set ZF */
State->Flags.Zf = TRUE;
/* Write back the result */
Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, SecondValue);
}
else
{
/* Clear ZF */
State->Flags.Zf = FALSE;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodePushImm)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x68);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
{
ULONG Data;
if (!Fast486FetchDword(State, &Data))
{
/* Exception occurred */
return;
}
/* Call the internal API */
Fast486StackPush(State, Data);
}
else
{
SHORT Data;
if (!Fast486FetchWord(State, (PUSHORT)&Data))
{
/* Exception occurred */
return;
}
/* Call the internal API */
Fast486StackPush(State, Data);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeImulModrmImm)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
LONG Multiplier;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x69);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Fetch the parameters */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (Opcode == 0x6B)
{
CHAR Byte;
/* Fetch the immediate operand */
if (!Fast486FetchByte(State, (PUCHAR)&Byte))
{
/* Exception occurred */
return;
}
Multiplier = (LONG)Byte;
}
else
{
if (OperandSize)
{
LONG Dword;
/* Fetch the immediate operand */
if (!Fast486FetchDword(State, (PULONG)&Dword))
{
/* Exception occurred */
return;
}
Multiplier = Dword;
}
else
{
SHORT Word;
/* Fetch the immediate operand */
if (!Fast486FetchWord(State, (PUSHORT)&Word))
{
/* Exception occurred */
return;
}
Multiplier = (LONG)Word;
}
}
if (OperandSize)
{
LONG RegValue, Multiplicand;
LONGLONG Product;
/* Read the operands */
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
(PULONG)&RegValue,
(PULONG)&Multiplicand))
{
/* Exception occurred */
return;
}
/* Multiply */
Product = (LONGLONG)Multiplicand * (LONGLONG)Multiplier;
/* Check for carry/overflow */
State->Flags.Cf = State->Flags.Of = ((Product < MINLONG) || (Product > MAXLONG));
/* Write-back the result */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
(ULONG)((LONG)Product));
}
else
{
SHORT RegValue, Multiplicand;
LONG Product;
/* Read the operands */
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
(PUSHORT)&RegValue,
(PUSHORT)&Multiplicand))
{
/* Exception occurred */
return;
}
/* Multiply */
Product = (LONG)Multiplicand * (LONG)Multiplier;
/* Check for carry/overflow */
State->Flags.Cf = State->Flags.Of = ((Product < MINSHORT) || (Product > MAXSHORT));
/* Write-back the result */
Fast486WriteModrmWordOperands(State,
&ModRegRm,
TRUE,
(USHORT)((SHORT)Product));
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodePushByteImm)
{
CHAR Data;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x6A);
if (!Fast486FetchByte(State, (PUCHAR)&Data))
{
/* Exception occurred */
return;
}
/* Call the internal API */
Fast486StackPush(State, Data);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovByteModrm)
{
UCHAR FirstValue, SecondValue, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x88);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
if (Opcode & FAST486_OPCODE_WRITE_REG) Result = SecondValue;
else Result = FirstValue;
/* Write back the result */
Fast486WriteModrmByteOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovModrm)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFD) == 0x89);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG FirstValue, SecondValue, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
if (Opcode & FAST486_OPCODE_WRITE_REG) Result = SecondValue;
else Result = FirstValue;
/* Write back the result */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
else
{
USHORT FirstValue, SecondValue, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&FirstValue,
&SecondValue))
{
/* Exception occurred */
return;
}
if (Opcode & FAST486_OPCODE_WRITE_REG) Result = SecondValue;
else Result = FirstValue;
/* Write back the result */
Fast486WriteModrmWordOperands(State,
&ModRegRm,
Opcode & FAST486_OPCODE_WRITE_REG,
Result);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovStoreSeg)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x8C);
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (ModRegRm.Register >= FAST486_NUM_SEG_REGS)
{
/* Invalid */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (OperandSize)
{
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
FALSE,
State->SegmentRegs[ModRegRm.Register].Selector);
}
else
{
Fast486WriteModrmWordOperands(State,
&ModRegRm,
FALSE,
State->SegmentRegs[ModRegRm.Register].Selector);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeLea)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x8D);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* The second operand must be memory */
if (!ModRegRm.Memory)
{
/* Invalid */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
/* Write the address to the register */
if (OperandSize)
{
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
ModRegRm.MemoryAddress);
}
else
{
Fast486WriteModrmWordOperands(State,
&ModRegRm,
TRUE,
ModRegRm.MemoryAddress);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovLoadSeg)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x8E);
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if ((ModRegRm.Register >= FAST486_NUM_SEG_REGS)
|| ((FAST486_SEG_REGS)ModRegRm.Register == FAST486_REG_CS))
{
/* Invalid */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (OperandSize)
{
ULONG Selector;
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Selector))
{
/* Exception occurred */
return;
}
if (!Fast486LoadSegment(State, ModRegRm.Register, LOWORD(Selector)))
{
/* Exception occurred */
return;
}
}
else
{
USHORT Selector;
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Selector))
{
/* Exception occurred */
return;
}
if (!Fast486LoadSegment(State, ModRegRm.Register, Selector))
{
/* Exception occurred */
return;
}
}
if ((INT)ModRegRm.Register == FAST486_REG_SS)
{
/* Inhibit all interrupts until the next instruction */
State->DoNotInterrupt = TRUE;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeCwde)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x98);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
if (Size)
{
/* Sign extend AX to EAX */
State->GeneralRegs[FAST486_REG_EAX].Long = MAKELONG
(
State->GeneralRegs[FAST486_REG_EAX].LowWord,
(State->GeneralRegs[FAST486_REG_EAX].LowWord & SIGN_FLAG_WORD)
? 0xFFFF : 0x0000
);
}
else
{
/* Sign extend AL to AX */
State->GeneralRegs[FAST486_REG_EAX].HighByte =
(State->GeneralRegs[FAST486_REG_EAX].LowByte & SIGN_FLAG_BYTE)
? 0xFF : 0x00;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeCdq)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x99);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
if (Size)
{
/* Sign extend EAX to EDX:EAX */
State->GeneralRegs[FAST486_REG_EDX].Long =
(State->GeneralRegs[FAST486_REG_EAX].Long & SIGN_FLAG_LONG)
? 0xFFFFFFFF : 0x00000000;
}
else
{
/* Sign extend AX to DX:AX */
State->GeneralRegs[FAST486_REG_EDX].LowWord =
(State->GeneralRegs[FAST486_REG_EAX].LowWord & SIGN_FLAG_WORD)
? 0xFFFF : 0x0000;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeCallAbs)
{
USHORT Segment = 0;
ULONG Offset = 0;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x9A);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
/* Fetch the offset */
if (Size)
{
if (!Fast486FetchDword(State, &Offset))
{
/* Exception occurred */
return;
}
}
else
{
if (!Fast486FetchWord(State, (PUSHORT)&Offset))
{
/* Exception occurred */
return;
}
}
/* Fetch the segment */
if (!Fast486FetchWord(State, &Segment))
{
/* Exception occurred */
return;
}
if (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
{
if (!Fast486ProcessGate(State, Segment, Offset, TRUE))
{
/* Gate processed or exception occurred */
return;
}
}
/* Push the current code segment selector */
if (!Fast486StackPush(State, State->SegmentRegs[FAST486_REG_CS].Selector))
{
/* Exception occurred */
return;
}
/* Push the current value of the instruction pointer */
if (!Fast486StackPush(State, State->InstPtr.Long))
{
/* Exception occurred */
return;
}
/* Load the new CS */
if (!Fast486LoadSegment(State, FAST486_REG_CS, Segment))
{
/* Exception occurred */
return;
}
/* Load new (E)IP */
if (Size) State->InstPtr.Long = Offset;
else State->InstPtr.LowWord = LOWORD(Offset);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeWait)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
}
FAST486_OPCODE_HANDLER(Fast486OpcodePushFlags)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
/* Check for VM86 mode when IOPL is not 3 */
if (State->Flags.Vm && (State->Flags.Iopl != 3))
{
/* Call the VM86 monitor */
Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_GP, 0);
return;
}
/* Push the flags */
if (Size) Fast486StackPush(State, State->Flags.Long);
else Fast486StackPush(State, LOWORD(State->Flags.Long));
}
FAST486_OPCODE_HANDLER(Fast486OpcodePopFlags)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
INT Cpl = Fast486GetCurrentPrivLevel(State);
FAST486_FLAGS_REG NewFlags;
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
/* Pop the new flags */
if (!Fast486StackPop(State, &NewFlags.Long))
{
/* Exception occurred */
return;
}
/* Check for VM86 mode when IOPL is not 3 */
if (State->Flags.Vm && (State->Flags.Iopl != 3))
{
/* Call the VM86 monitor */
Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_GP, 0);
return;
}
State->Flags.Cf = NewFlags.Cf;
State->Flags.Pf = NewFlags.Pf;
State->Flags.Af = NewFlags.Af;
State->Flags.Zf = NewFlags.Zf;
State->Flags.Sf = NewFlags.Sf;
State->Flags.Tf = NewFlags.Tf;
State->Flags.Df = NewFlags.Df;
State->Flags.Of = NewFlags.Of;
State->Flags.Nt = NewFlags.Nt;
State->Flags.Ac = NewFlags.Ac;
if (Cpl == 0) State->Flags.Iopl = NewFlags.Iopl;
if (Cpl <= State->Flags.Iopl) State->Flags.If = NewFlags.If;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeSahf)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x9E);
/* Set the low-order byte of FLAGS to AH */
State->Flags.Long &= 0xFFFFFF00;
State->Flags.Long |= State->GeneralRegs[FAST486_REG_EAX].HighByte;
/* Restore the reserved bits of FLAGS */
State->Flags.AlwaysSet = TRUE;
State->Flags.Reserved0 = State->Flags.Reserved1 = FALSE;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeLahf)
{
/* Make sure this is the right instruction */
ASSERT(Opcode == 0x9F);
/* Set AH to the low-order byte of FLAGS */
State->GeneralRegs[FAST486_REG_EAX].HighByte = LOBYTE(State->Flags.Long);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeRet)
{
ULONG ReturnAddress;
USHORT BytesToPop = 0;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xC2);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Opcode == 0xC2)
{
/* Fetch the number of bytes to pop after the return */
if (!Fast486FetchWord(State, &BytesToPop)) return;
}
/* Pop the return address */
if (!Fast486StackPop(State, &ReturnAddress)) return;
/* Return to the calling procedure, and if necessary, pop the parameters */
if (Size)
{
State->InstPtr.Long = ReturnAddress;
State->GeneralRegs[FAST486_REG_ESP].Long += BytesToPop;
}
else
{
State->InstPtr.LowWord = LOWORD(ReturnAddress);
State->GeneralRegs[FAST486_REG_ESP].LowWord += BytesToPop;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeLdsLes)
{
UCHAR FarPointer[6];
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xC4);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!ModRegRm.Memory)
{
/* Check if this is a BOP and the host supports BOPs */
if ((Opcode == 0xC4)
&& (ModRegRm.Register == FAST486_REG_EAX)
&& (ModRegRm.SecondRegister == FAST486_REG_ESP)
&& (State->BopCallback != NULL))
{
UCHAR BopCode;
/* Fetch the BOP code */
if (!Fast486FetchByte(State, &BopCode))
{
/* Exception occurred */
return;
}
#ifndef FAST486_NO_PREFETCH
/* Invalidate the prefetch since BOP handlers can alter the memory */
State->PrefetchValid = FALSE;
#endif
/* Call the BOP handler */
State->BopCallback(State, BopCode);
/*
* If an interrupt should occur at this time, delay it.
* We must do this because if an interrupt begins and the BOP callback
* changes the CS:IP, the interrupt handler won't execute and the
* stack pointer will never be restored.
*/
State->DoNotInterrupt = TRUE;
return;
}
/* Invalid */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (!Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
? State->SegmentOverride : FAST486_REG_DS,
ModRegRm.MemoryAddress,
FALSE,
FarPointer,
OperandSize ? 6 : 4))
{
/* Exception occurred */
return;
}
if (OperandSize)
{
ULONG Offset = *((PULONG)FarPointer);
USHORT Segment = *((PUSHORT)&FarPointer[sizeof(ULONG)]);
/* Set the register to the offset */
State->GeneralRegs[ModRegRm.Register].Long = Offset;
/* Load the segment */
Fast486LoadSegment(State,
(Opcode == 0xC4)
? FAST486_REG_ES : FAST486_REG_DS,
Segment);
}
else
{
USHORT Offset = *((PUSHORT)FarPointer);
USHORT Segment = *((PUSHORT)&FarPointer[sizeof(USHORT)]);
/* Set the register to the offset */
State->GeneralRegs[ModRegRm.Register].LowWord = Offset;
/* Load the segment */
Fast486LoadSegment(State,
(Opcode == 0xC4)
? FAST486_REG_ES : FAST486_REG_DS,
Segment);
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeEnter)
{
INT i;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
USHORT FrameSize;
UCHAR NestingLevel;
FAST486_REG FramePointer;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xC8);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (!Fast486FetchWord(State, &FrameSize))
{
/* Exception occurred */
return;
}
if (!Fast486FetchByte(State, &NestingLevel))
{
/* Exception occurred */
return;
}
/* Push EBP */
if (!Fast486StackPush(State, State->GeneralRegs[FAST486_REG_EBP].Long))
{
/* Exception occurred */
return;
}
/* Save ESP */
FramePointer = State->GeneralRegs[FAST486_REG_ESP];
/* Set up the nested procedure stacks */
for (i = 1; i < NestingLevel; i++)
{
if (Size)
{
State->GeneralRegs[FAST486_REG_EBP].Long -= 4;
Fast486StackPush(State, State->GeneralRegs[FAST486_REG_EBP].Long);
}
else
{
State->GeneralRegs[FAST486_REG_EBP].LowWord -= 2;
Fast486StackPush(State, State->GeneralRegs[FAST486_REG_EBP].LowWord);
}
}
if (NestingLevel > 0) Fast486StackPush(State, FramePointer.Long);
/* Set EBP to the frame pointer */
State->GeneralRegs[FAST486_REG_EBP] = FramePointer;
/* Reserve space for the frame */
if (Size) State->GeneralRegs[FAST486_REG_ESP].Long -= (ULONG)FrameSize;
else State->GeneralRegs[FAST486_REG_ESP].LowWord -= FrameSize;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeLeave)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xC9);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
if (Size)
{
/* Set the stack pointer (ESP) to the base pointer (EBP) */
State->GeneralRegs[FAST486_REG_ESP].Long = State->GeneralRegs[FAST486_REG_EBP].Long;
/* Pop the saved base pointer from the stack */
Fast486StackPop(State, &State->GeneralRegs[FAST486_REG_EBP].Long);
}
else
{
ULONG Value;
/* Set the stack pointer (SP) to the base pointer (BP) */
State->GeneralRegs[FAST486_REG_ESP].LowWord = State->GeneralRegs[FAST486_REG_EBP].LowWord;
/* Pop the saved base pointer from the stack */
if (Fast486StackPop(State, &Value))
{
State->GeneralRegs[FAST486_REG_EBP].LowWord = LOWORD(Value);
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeRetFar)
{
ULONG Segment = 0;
ULONG Offset = 0;
USHORT BytesToPop = 0;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xCA);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
if (Opcode == 0xCA)
{
/* Fetch the number of bytes to pop after the return */
if (!Fast486FetchWord(State, &BytesToPop)) return;
}
/* Pop the offset */
if (!Fast486StackPop(State, &Offset))
{
/* Exception occurred */
return;
}
/* Pop the segment */
if (!Fast486StackPop(State, &Segment))
{
/* Exception occurred */
return;
}
/* Load the new CS */
if (!Fast486LoadSegment(State, FAST486_REG_CS, Segment))
{
/* Exception occurred */
return;
}
if ((State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE) && !State->Flags.Vm)
{
INT i;
INT OldCpl = Fast486GetCurrentPrivLevel(State);
ULONG StackPtr;
ULONG StackSel;
if (GET_SEGMENT_RPL(Segment) > OldCpl)
{
/* Pop ESP */
if (!Fast486StackPop(State, &StackPtr))
{
/* Exception */
return;
}
/* Pop SS */
if (!Fast486StackPop(State, &StackSel))
{
/* Exception */
return;
}
}
/* Update the CPL */
State->Cpl = GET_SEGMENT_RPL(Segment);
if (State->Cpl > OldCpl)
{
/* Load new SS */
if (!Fast486LoadSegment(State, FAST486_REG_SS, StackSel))
{
/* Exception */
return;
}
/* Set ESP */
if (Size) State->GeneralRegs[FAST486_REG_ESP].Long = StackPtr;
else State->GeneralRegs[FAST486_REG_ESP].LowWord = LOWORD(StackPtr);
/* Check segment security */
for (i = 0; i < FAST486_NUM_SEG_REGS; i++)
{
/* Don't check CS or SS */
if ((i == FAST486_REG_CS) || (i == FAST486_REG_SS)) continue;
if ((State->Cpl > State->SegmentRegs[i].Dpl)
&& (!State->SegmentRegs[i].Executable
|| !State->SegmentRegs[i].DirConf))
{
/* Load the NULL descriptor in the segment */
if (!Fast486LoadSegment(State, i, 0)) return;
}
}
}
}
/* Load new (E)IP, and if necessary, pop the parameters */
if (Size)
{
State->InstPtr.Long = Offset;
State->GeneralRegs[FAST486_REG_ESP].Long += BytesToPop;
}
else
{
State->InstPtr.LowWord = LOWORD(Offset);
State->GeneralRegs[FAST486_REG_ESP].LowWord += BytesToPop;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeInt)
{
UCHAR IntNum;
switch (Opcode)
{
case 0xCC: // INT 3
{
/* This is the INT3 instruction */
IntNum = 3;
break;
}
case 0xCD: // INT xx
{
/* Fetch the interrupt number */
if (!Fast486FetchByte(State, &IntNum))
{
/* Exception occurred */
return;
}
break;
}
case 0xCE: // INTO
{
/* Don't do anything if OF is cleared */
if (!State->Flags.Of) return;
/* Exception #OF */
IntNum = FAST486_EXCEPTION_OF;
break;
}
default:
{
/* Should not happen */
ASSERT(FALSE);
}
}
/* Perform the interrupt */
Fast486PerformInterrupt(State, IntNum);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeIret)
{
FAST486_SEG_REGS i;
ULONG InstPtr, CodeSel, StackPtr, StackSel;
FAST486_FLAGS_REG NewFlags;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xCF);
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(Size);
/* Check if this is a nested task return */
if (State->Flags.Nt && (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE))
{
/* Clear the NT flag of the current task */
State->Flags.Nt = FALSE;
/* Switch to the old task */
Fast486TaskSwitch(State, FAST486_TASK_RETURN, 0);
return;
}
/* Pop EIP */
if (!Fast486StackPop(State, &InstPtr))
{
/* Exception occurred */
return;
}
/* Pop CS */
if (!Fast486StackPop(State, &CodeSel))
{
/* Exception occurred */
return;
}
/* Pop EFLAGS */
if (!Fast486StackPop(State, &NewFlags.Long))
{
/* Exception occurred */
return;
}
/* Check for protected mode */
if (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
{
INT OldCpl = Fast486GetCurrentPrivLevel(State);
if (State->Flags.Vm)
{
/* Return from VM86 mode */
/* Check the IOPL */
if (State->Flags.Iopl == 3)
{
/* Set new EIP */
State->InstPtr.Long = LOWORD(InstPtr);
/* Load new CS */
if (!Fast486LoadSegment(State, FAST486_REG_CS, CodeSel))
{
/* Exception occurred */
return;
}
/* Set the new flags */
if (Size) State->Flags.Long = NewFlags.Long & REAL_MODE_FLAGS_MASK;
else State->Flags.LowWord = NewFlags.LowWord & REAL_MODE_FLAGS_MASK;
State->Flags.AlwaysSet = State->Flags.Vm = TRUE;
State->Flags.Iopl = 3;
}
else
{
/* Call the VM86 monitor */
Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_GP, 0);
return;
}
return;
}
if (NewFlags.Vm)
{
/* Return to VM86 mode */
ULONG Es, Ds, Fs, Gs;
/* Pop ESP, SS, ES, FS, GS */
if (!Fast486StackPop(State, &StackPtr)) return;
if (!Fast486StackPop(State, &StackSel)) return;
if (!Fast486StackPop(State, &Es)) return;
if (!Fast486StackPop(State, &Ds)) return;
if (!Fast486StackPop(State, &Fs)) return;
if (!Fast486StackPop(State, &Gs)) return;
/* Set the new IP */
State->InstPtr.Long = LOWORD(InstPtr);
/* Set the new flags */
if (Size) State->Flags.Long = NewFlags.Long & REAL_MODE_FLAGS_MASK;
else State->Flags.LowWord = NewFlags.LowWord & REAL_MODE_FLAGS_MASK;
State->Flags.AlwaysSet = State->Flags.Vm = TRUE;
/* Load the new segments */
if (!Fast486LoadSegment(State, FAST486_REG_CS, CodeSel)) return;
if (!Fast486LoadSegment(State, FAST486_REG_SS, StackSel)) return;
if (!Fast486LoadSegment(State, FAST486_REG_ES, Es)) return;
if (!Fast486LoadSegment(State, FAST486_REG_DS, Ds)) return;
if (!Fast486LoadSegment(State, FAST486_REG_FS, Fs)) return;
if (!Fast486LoadSegment(State, FAST486_REG_GS, Gs)) return;
return;
}
/* Load the new CS */
if (!Fast486LoadSegment(State, FAST486_REG_CS, CodeSel))
{
/* Exception occurred */
return;
}
/* Set EIP */
if (Size) State->InstPtr.Long = InstPtr;
else State->InstPtr.LowWord = LOWORD(InstPtr);
if (GET_SEGMENT_RPL(CodeSel) > OldCpl)
{
/* Pop ESP */
if (!Fast486StackPop(State, &StackPtr))
{
/* Exception */
return;
}
/* Pop SS */
if (!Fast486StackPop(State, &StackSel))
{
/* Exception */
return;
}
}
/* Update the CPL */
State->Cpl = GET_SEGMENT_RPL(CodeSel);
/* Set the new flags */
if (Size) State->Flags.Long = NewFlags.Long & PROT_MODE_FLAGS_MASK;
else State->Flags.LowWord = NewFlags.LowWord & PROT_MODE_FLAGS_MASK;
State->Flags.AlwaysSet = TRUE;
/* Set additional flags */
if (OldCpl <= State->Flags.Iopl) State->Flags.If = NewFlags.If;
if (OldCpl == 0) State->Flags.Iopl = NewFlags.Iopl;
if (State->Cpl > OldCpl)
{
/* Load new SS */
if (!Fast486LoadSegment(State, FAST486_REG_SS, StackSel))
{
/* Exception */
return;
}
/* Set ESP */
if (Size) State->GeneralRegs[FAST486_REG_ESP].Long = StackPtr;
else State->GeneralRegs[FAST486_REG_ESP].LowWord = LOWORD(StackPtr);
/* Check segment security */
for (i = 0; i < FAST486_NUM_SEG_REGS; i++)
{
/* Don't check CS or SS */
if ((i == FAST486_REG_CS) || (i == FAST486_REG_SS)) continue;
if ((State->Cpl > State->SegmentRegs[i].Dpl)
&& (!State->SegmentRegs[i].Executable
|| !State->SegmentRegs[i].DirConf))
{
/* Load the NULL descriptor in the segment */
if (!Fast486LoadSegment(State, i, 0)) return;
}
}
}
}
else
{
if (Size && (InstPtr & 0xFFFF0000))
{
/* Invalid */
Fast486ExceptionWithErrorCode(State, FAST486_EXCEPTION_GP, 0);
return;
}
/* Set new EIP */
State->InstPtr.Long = InstPtr;
/* Load new CS */
if (!Fast486LoadSegment(State, FAST486_REG_CS, CodeSel))
{
/* Exception occurred */
return;
}
/* Set the new flags */
if (Size) State->Flags.Long = NewFlags.Long & REAL_MODE_FLAGS_MASK;
else State->Flags.LowWord = NewFlags.LowWord & REAL_MODE_FLAGS_MASK;
State->Flags.AlwaysSet = TRUE;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAam)
{
UCHAR Base;
UCHAR Value = State->GeneralRegs[FAST486_REG_EAX].LowByte;
NO_LOCK_PREFIX();
/* Fetch the base */
if (!Fast486FetchByte(State, &Base))
{
/* Exception occurred */
return;
}
/* Check if the base is zero */
if (Base == 0)
{
/* Divide error */
Fast486Exception(State, FAST486_EXCEPTION_DE);
return;
}
/* Adjust */
State->GeneralRegs[FAST486_REG_EAX].HighByte = Value / Base;
State->GeneralRegs[FAST486_REG_EAX].LowByte = Value %= Base;
/* Update flags */
State->Flags.Af = FALSE;
State->Flags.Zf = (Value == 0);
State->Flags.Sf = ((Value & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Value);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeAad)
{
UCHAR Base;
UCHAR Value = State->GeneralRegs[FAST486_REG_EAX].LowByte;
NO_LOCK_PREFIX();
/* Fetch the base */
if (!Fast486FetchByte(State, &Base))
{
/* Exception occurred */
return;
}
/* Adjust */
Value += State->GeneralRegs[FAST486_REG_EAX].HighByte * Base;
State->GeneralRegs[FAST486_REG_EAX].LowWord = Value;
/* Update flags */
State->Flags.Af = FALSE;
State->Flags.Zf = (Value == 0);
State->Flags.Sf = ((Value & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Value);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeXlat)
{
UCHAR Value;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
/* Read a byte from DS:[(E)BX + AL] */
if (!Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
? State->SegmentOverride : FAST486_REG_DS,
(AddressSize ? State->GeneralRegs[FAST486_REG_EBX].Long
: State->GeneralRegs[FAST486_REG_EBX].LowWord)
+ State->GeneralRegs[FAST486_REG_EAX].LowByte,
FALSE,
&Value,
sizeof(UCHAR)))
{
/* Exception occurred */
return;
}
/* Set AL to the result */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Value;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeLoop)
{
BOOLEAN Condition;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
CHAR Offset = 0;
/* Make sure this is the right instruction */
ASSERT((Opcode >= 0xE0) && (Opcode <= 0xE2));
NO_LOCK_PREFIX();
TOGGLE_ADSIZE(Size);
if (Size) Condition = ((--State->GeneralRegs[FAST486_REG_ECX].Long) != 0);
else Condition = ((--State->GeneralRegs[FAST486_REG_ECX].LowWord) != 0);
if (Opcode == 0xE0)
{
/* Additional rule for LOOPNZ */
if (State->Flags.Zf) Condition = FALSE;
}
else if (Opcode == 0xE1)
{
/* Additional rule for LOOPZ */
if (!State->Flags.Zf) Condition = FALSE;
}
/* Fetch the offset */
if (!Fast486FetchByte(State, (PUCHAR)&Offset))
{
/* An exception occurred */
return;
}
if (Condition)
{
/* Move the instruction pointer */
if (Size) State->InstPtr.Long += Offset;
else State->InstPtr.LowWord += Offset;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeJecxz)
{
BOOLEAN Condition;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
CHAR Offset = 0;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xE3);
NO_LOCK_PREFIX();
TOGGLE_ADSIZE(Size);
if (Size) Condition = (State->GeneralRegs[FAST486_REG_ECX].Long == 0);
else Condition = (State->GeneralRegs[FAST486_REG_ECX].LowWord == 0);
/* Fetch the offset */
if (!Fast486FetchByte(State, (PUCHAR)&Offset))
{
/* An exception occurred */
return;
}
if (Condition)
{
/* Move the instruction pointer */
if (Size) State->InstPtr.Long += Offset;
else State->InstPtr.LowWord += Offset;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeCall)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xE8);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
if (Size)
{
LONG Offset = 0;
/* Fetch the offset */
if (!Fast486FetchDword(State, (PULONG)&Offset))
{
/* An exception occurred */
return;
}
/* Push the current value of the instruction pointer */
if (!Fast486StackPush(State, State->InstPtr.Long))
{
/* Exception occurred */
return;
}
/* Move the instruction pointer */
State->InstPtr.Long += Offset;
}
else
{
SHORT Offset = 0;
/* Fetch the offset */
if (!Fast486FetchWord(State, (PUSHORT)&Offset))
{
/* An exception occurred */
return;
}
/* Push the current value of the instruction pointer */
if (!Fast486StackPush(State, State->InstPtr.Long))
{
/* Exception occurred */
return;
}
/* Move the instruction pointer */
State->InstPtr.LowWord += Offset;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeJmp)
{
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xE9);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
if (Size)
{
LONG Offset = 0;
/* Fetch the offset */
if (!Fast486FetchDword(State, (PULONG)&Offset))
{
/* An exception occurred */
return;
}
/* Move the instruction pointer */
State->InstPtr.Long += Offset;
}
else
{
SHORT Offset = 0;
/* Fetch the offset */
if (!Fast486FetchWord(State, (PUSHORT)&Offset))
{
/* An exception occurred */
return;
}
/* Move the instruction pointer */
State->InstPtr.Long += Offset;
/* Clear the top half of EIP */
State->InstPtr.Long &= 0xFFFF;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeJmpAbs)
{
USHORT Segment = 0;
ULONG Offset = 0;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xEA);
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
/* Fetch the offset */
if (Size)
{
if (!Fast486FetchDword(State, &Offset))
{
/* Exception occurred */
return;
}
}
else
{
if (!Fast486FetchWord(State, (PUSHORT)&Offset))
{
/* Exception occurred */
return;
}
}
/* Fetch the segment */
if (!Fast486FetchWord(State, &Segment))
{
/* Exception occurred */
return;
}
if (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
{
if (!Fast486ProcessGate(State, Segment, Offset, FALSE))
{
/* Gate processed or exception occurred */
return;
}
}
/* Load the new CS */
if (!Fast486LoadSegment(State, FAST486_REG_CS, Segment))
{
/* Exception occurred */
return;
}
/* Load new EIP */
State->InstPtr.Long = Offset;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovAlOffset)
{
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
ULONG Offset;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xA0);
TOGGLE_ADSIZE(AddressSize);
if (AddressSize)
{
if (!Fast486FetchDword(State, &Offset))
{
/* Exception occurred */
return;
}
}
else
{
USHORT WordOffset;
if (!Fast486FetchWord(State, &WordOffset))
{
/* Exception occurred */
return;
}
Offset = (ULONG)WordOffset;
}
/* Read from memory */
Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG) ?
State->SegmentOverride : FAST486_REG_DS,
Offset,
FALSE,
&State->GeneralRegs[FAST486_REG_EAX].LowByte,
sizeof(UCHAR));
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovEaxOffset)
{
BOOLEAN OperandSize, AddressSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xA1);
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
if (AddressSize)
{
ULONG Offset;
if (!Fast486FetchDword(State, &Offset))
{
/* Exception occurred */
return;
}
/* Read from memory */
if (OperandSize)
{
Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG) ?
State->SegmentOverride : FAST486_REG_DS,
Offset,
FALSE,
&State->GeneralRegs[FAST486_REG_EAX].Long,
sizeof(ULONG));
}
else
{
Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG) ?
State->SegmentOverride : FAST486_REG_DS,
Offset,
FALSE,
&State->GeneralRegs[FAST486_REG_EAX].LowWord,
sizeof(USHORT));
}
}
else
{
USHORT Offset;
if (!Fast486FetchWord(State, &Offset))
{
/* Exception occurred */
return;
}
/* Read from memory */
if (OperandSize)
{
Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG) ?
State->SegmentOverride : FAST486_REG_DS,
Offset,
FALSE,
&State->GeneralRegs[FAST486_REG_EAX].Long,
sizeof(ULONG));
}
else
{
Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG) ?
State->SegmentOverride : FAST486_REG_DS,
Offset,
FALSE,
&State->GeneralRegs[FAST486_REG_EAX].LowWord,
sizeof(USHORT));
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovOffsetAl)
{
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
ULONG Offset;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xA2);
TOGGLE_ADSIZE(AddressSize);
if (AddressSize)
{
if (!Fast486FetchDword(State, &Offset))
{
/* Exception occurred */
return;
}
}
else
{
USHORT WordOffset;
if (!Fast486FetchWord(State, &WordOffset))
{
/* Exception occurred */
return;
}
Offset = (ULONG)WordOffset;
}
/* Write to memory */
Fast486WriteMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG) ?
State->SegmentOverride : FAST486_REG_DS,
Offset,
&State->GeneralRegs[FAST486_REG_EAX].LowByte,
sizeof(UCHAR));
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovOffsetEax)
{
BOOLEAN OperandSize, AddressSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xA3);
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
if (AddressSize)
{
ULONG Offset;
if (!Fast486FetchDword(State, &Offset))
{
/* Exception occurred */
return;
}
/* Write to memory */
if (OperandSize)
{
Fast486WriteMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG) ?
State->SegmentOverride : FAST486_REG_DS,
Offset,
&State->GeneralRegs[FAST486_REG_EAX].Long,
sizeof(ULONG));
}
else
{
Fast486WriteMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG) ?
State->SegmentOverride : FAST486_REG_DS,
Offset,
&State->GeneralRegs[FAST486_REG_EAX].LowWord,
sizeof(USHORT));
}
}
else
{
USHORT Offset;
if (!Fast486FetchWord(State, &Offset))
{
/* Exception occurred */
return;
}
/* Write to memory */
if (OperandSize)
{
Fast486WriteMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG) ?
State->SegmentOverride : FAST486_REG_DS,
Offset,
&State->GeneralRegs[FAST486_REG_EAX].Long,
sizeof(ULONG));
}
else
{
Fast486WriteMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG) ?
State->SegmentOverride : FAST486_REG_DS,
Offset,
&State->GeneralRegs[FAST486_REG_EAX].LowWord,
sizeof(USHORT));
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeSalc)
{
/*
* See: http://www.rcollins.org/secrets/opcodes/SALC.html
* for more information.
*/
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xD6);
NO_LOCK_PREFIX();
/* Set all the bits of AL to CF */
State->GeneralRegs[FAST486_REG_EAX].LowByte = State->Flags.Cf ? 0xFF : 0x00;
}
FAST486_OPCODE_HANDLER(Fast486OpcodeMovs)
{
ULONG Data, DataSize;
BOOLEAN OperandSize, AddressSize;
FAST486_SEG_REGS Segment = FAST486_REG_DS;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xA4);
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
if (State->PrefixFlags & FAST486_PREFIX_SEG)
{
/* Use the override segment instead of DS */
Segment = State->SegmentOverride;
}
if (State->PrefixFlags & (FAST486_PREFIX_REP | FAST486_PREFIX_REPNZ))
{
if ((AddressSize && (State->GeneralRegs[FAST486_REG_ECX].Long == 0))
|| (!AddressSize && (State->GeneralRegs[FAST486_REG_ECX].LowWord == 0)))
{
/* Do nothing */
return;
}
}
/* Calculate the size */
if (Opcode == 0xA4) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
/* Read from the source operand */
if (!Fast486ReadMemory(State,
Segment,
AddressSize ? State->GeneralRegs[FAST486_REG_ESI].Long
: State->GeneralRegs[FAST486_REG_ESI].LowWord,
FALSE,
&Data,
DataSize))
{
/* Exception occurred */
return;
}
/* Write to the destination operand */
if (!Fast486WriteMemory(State,
FAST486_REG_ES,
AddressSize ? State->GeneralRegs[FAST486_REG_EDI].Long
: State->GeneralRegs[FAST486_REG_EDI].LowWord,
&Data,
DataSize))
{
/* Exception occurred */
return;
}
/* Increment/decrement ESI and EDI */
if (AddressSize)
{
if (!State->Flags.Df)
{
State->GeneralRegs[FAST486_REG_ESI].Long += DataSize;
State->GeneralRegs[FAST486_REG_EDI].Long += DataSize;
}
else
{
State->GeneralRegs[FAST486_REG_ESI].Long -= DataSize;
State->GeneralRegs[FAST486_REG_EDI].Long -= DataSize;
}
}
else
{
if (!State->Flags.Df)
{
State->GeneralRegs[FAST486_REG_ESI].LowWord += DataSize;
State->GeneralRegs[FAST486_REG_EDI].LowWord += DataSize;
}
else
{
State->GeneralRegs[FAST486_REG_ESI].LowWord -= DataSize;
State->GeneralRegs[FAST486_REG_EDI].LowWord -= DataSize;
}
}
// FIXME: This method is slow!
if (State->PrefixFlags & (FAST486_PREFIX_REP | FAST486_PREFIX_REPNZ))
{
if (AddressSize)
{
if (--State->GeneralRegs[FAST486_REG_ECX].Long)
{
/* Repeat the instruction */
State->InstPtr = State->SavedInstPtr;
}
}
else
{
if (--State->GeneralRegs[FAST486_REG_ECX].LowWord)
{
/* Repeat the instruction */
State->InstPtr = State->SavedInstPtr;
}
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeCmps)
{
ULONG FirstValue = 0, SecondValue = 0, Result;
ULONG DataSize, DataMask, SignFlag;
BOOLEAN OperandSize, AddressSize;
FAST486_SEG_REGS Segment = FAST486_REG_DS;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xA6);
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
if (State->PrefixFlags & FAST486_PREFIX_SEG)
{
/* Use the override segment instead of DS */
Segment = State->SegmentOverride;
}
if ((State->PrefixFlags & FAST486_PREFIX_REP)
|| (State->PrefixFlags & FAST486_PREFIX_REPNZ))
{
if ((AddressSize && (State->GeneralRegs[FAST486_REG_ECX].Long == 0))
|| (!AddressSize && (State->GeneralRegs[FAST486_REG_ECX].LowWord == 0)))
{
/* Do nothing */
return;
}
}
/* Calculate the size */
if (Opcode == 0xA6) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
/* Calculate the mask and sign flag */
SignFlag = 1 << ((DataSize * 8) - 1);
DataMask = SignFlag | (SignFlag - 1);
/* Read from the first source operand */
if (!Fast486ReadMemory(State,
Segment,
AddressSize ? State->GeneralRegs[FAST486_REG_ESI].Long
: State->GeneralRegs[FAST486_REG_ESI].LowWord,
FALSE,
&FirstValue,
DataSize))
{
/* Exception occurred */
return;
}
/* Read from the second source operand */
if (!Fast486ReadMemory(State,
FAST486_REG_ES,
AddressSize ? State->GeneralRegs[FAST486_REG_EDI].Long
: State->GeneralRegs[FAST486_REG_EDI].LowWord,
FALSE,
&SecondValue,
DataSize))
{
/* Exception occurred */
return;
}
/* Calculate the result */
FirstValue &= DataMask;
SecondValue &= DataMask;
Result = (FirstValue - SecondValue) & DataMask;
/* Update the flags */
State->Flags.Cf = (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SignFlag) != (SecondValue & SignFlag))
&& ((FirstValue & SignFlag) != (Result & SignFlag));
State->Flags.Af = (FirstValue & 0x0F) < (SecondValue & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SignFlag) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Increment/decrement ESI and EDI */
if (AddressSize)
{
if (!State->Flags.Df)
{
State->GeneralRegs[FAST486_REG_ESI].Long += DataSize;
State->GeneralRegs[FAST486_REG_EDI].Long += DataSize;
}
else
{
State->GeneralRegs[FAST486_REG_ESI].Long -= DataSize;
State->GeneralRegs[FAST486_REG_EDI].Long -= DataSize;
}
}
else
{
if (!State->Flags.Df)
{
State->GeneralRegs[FAST486_REG_ESI].LowWord += DataSize;
State->GeneralRegs[FAST486_REG_EDI].LowWord += DataSize;
}
else
{
State->GeneralRegs[FAST486_REG_ESI].LowWord -= DataSize;
State->GeneralRegs[FAST486_REG_EDI].LowWord -= DataSize;
}
}
// FIXME: This method is slow!
if ((State->PrefixFlags & FAST486_PREFIX_REP)
|| (State->PrefixFlags & FAST486_PREFIX_REPNZ))
{
BOOLEAN Repeat = TRUE;
if (AddressSize)
{
if ((--State->GeneralRegs[FAST486_REG_ECX].Long) == 0)
{
/* ECX is 0 */
Repeat = FALSE;
}
}
else
{
if ((--State->GeneralRegs[FAST486_REG_ECX].LowWord) == 0)
{
/* CX is 0 */
Repeat = FALSE;
}
}
if (((State->PrefixFlags & FAST486_PREFIX_REP) && !State->Flags.Zf)
|| ((State->PrefixFlags & FAST486_PREFIX_REPNZ) && State->Flags.Zf))
{
/* REPZ with ZF = 0 or REPNZ with ZF = 1 */
Repeat = FALSE;
}
if (Repeat)
{
/* Repeat the instruction */
State->InstPtr = State->SavedInstPtr;
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeStos)
{
ULONG DataSize;
BOOLEAN OperandSize, AddressSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xAA);
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Calculate the size */
if (Opcode == 0xAA) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
if (State->PrefixFlags & (FAST486_PREFIX_REP | FAST486_PREFIX_REPNZ))
{
UCHAR Block[STRING_BLOCK_SIZE];
ULONG Count = AddressSize ? State->GeneralRegs[FAST486_REG_ECX].Long
: State->GeneralRegs[FAST486_REG_ECX].LowWord;
/* Fill the memory block with the data */
if (DataSize == sizeof(UCHAR))
{
RtlFillMemory(Block, sizeof(Block), State->GeneralRegs[FAST486_REG_EAX].LowByte);
}
else
{
ULONG i;
for (i = 0; i < STRING_BLOCK_SIZE / DataSize; i++)
{
if (DataSize == sizeof(USHORT))
{
((PUSHORT)Block)[i] = State->GeneralRegs[FAST486_REG_EAX].LowWord;
}
else
{
((PULONG)Block)[i] = State->GeneralRegs[FAST486_REG_EAX].Long;
}
}
}
/* Transfer until finished */
while (Count)
{
ULONG Processed = min(Count, STRING_BLOCK_SIZE / DataSize);
/* Simulate the 16-bit wrap-around of DI in 16-bit address mode */
if (!AddressSize)
{
ULONG MaxBytes = State->Flags.Df
? (ULONG)State->GeneralRegs[FAST486_REG_EDI].LowWord
: (0x10000 - (ULONG)State->GeneralRegs[FAST486_REG_EDI].LowWord);
Processed = min(Processed, MaxBytes / DataSize);
if (Processed == 0) Processed = 1;
}
if (State->Flags.Df)
{
/* Set EDI to the starting location */
if (AddressSize) State->GeneralRegs[FAST486_REG_EDI].Long -= (Processed - 1) * DataSize;
else State->GeneralRegs[FAST486_REG_EDI].LowWord -= (Processed - 1) * DataSize;
}
/* Write to memory */
if (!Fast486WriteMemory(State,
FAST486_REG_ES,
AddressSize ? State->GeneralRegs[FAST486_REG_EDI].Long
: State->GeneralRegs[FAST486_REG_EDI].LowWord,
Block,
Processed * DataSize))
{
/* Set ECX */
if (AddressSize) State->GeneralRegs[FAST486_REG_ECX].Long = Count;
else State->GeneralRegs[FAST486_REG_ECX].LowWord = LOWORD(Count);
/* Exception occurred */
return;
}
if (!State->Flags.Df)
{
/* Increase EDI by the number of bytes transfered */
if (AddressSize) State->GeneralRegs[FAST486_REG_EDI].Long += Processed * DataSize;
else State->GeneralRegs[FAST486_REG_EDI].LowWord += Processed * DataSize;
}
else
{
/* Reduce EDI */
if (AddressSize) State->GeneralRegs[FAST486_REG_EDI].Long -= DataSize;
else State->GeneralRegs[FAST486_REG_EDI].LowWord -= DataSize;
}
/* Reduce the total count by the number processed in this run */
Count -= Processed;
}
/* Clear ECX */
if (AddressSize) State->GeneralRegs[FAST486_REG_ECX].Long = 0;
else State->GeneralRegs[FAST486_REG_ECX].LowWord = 0;
}
else
{
/* Write to the destination operand */
if (!Fast486WriteMemory(State,
FAST486_REG_ES,
AddressSize ? State->GeneralRegs[FAST486_REG_EDI].Long
: State->GeneralRegs[FAST486_REG_EDI].LowWord,
&State->GeneralRegs[FAST486_REG_EAX].Long,
DataSize))
{
/* Exception occurred */
return;
}
/* Increment/decrement EDI */
if (AddressSize)
{
if (!State->Flags.Df) State->GeneralRegs[FAST486_REG_EDI].Long += DataSize;
else State->GeneralRegs[FAST486_REG_EDI].Long -= DataSize;
}
else
{
if (!State->Flags.Df) State->GeneralRegs[FAST486_REG_EDI].LowWord += DataSize;
else State->GeneralRegs[FAST486_REG_EDI].LowWord -= DataSize;
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeLods)
{
ULONG DataSize;
BOOLEAN OperandSize, AddressSize;
FAST486_SEG_REGS Segment = FAST486_REG_DS;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xAC);
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
if (State->PrefixFlags & FAST486_PREFIX_SEG)
{
/* Use the override segment instead of DS */
Segment = State->SegmentOverride;
}
/* Calculate the size */
if (Opcode == 0xAC) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
if (State->PrefixFlags & (FAST486_PREFIX_REP | FAST486_PREFIX_REPNZ))
{
ULONG Count = AddressSize ? State->GeneralRegs[FAST486_REG_ECX].Long
: State->GeneralRegs[FAST486_REG_ECX].LowWord;
/* If the count is 0, do nothing */
if (Count == 0) return;
/* Only the last entry will be loaded */
if (!State->Flags.Df)
{
if (AddressSize) State->GeneralRegs[FAST486_REG_ESI].Long += (Count - 1) * DataSize;
else State->GeneralRegs[FAST486_REG_ESI].LowWord += (Count - 1) * DataSize;
}
else
{
if (AddressSize) State->GeneralRegs[FAST486_REG_ESI].Long -= (Count - 1) * DataSize;
else State->GeneralRegs[FAST486_REG_ESI].LowWord -= (Count - 1) * DataSize;
}
/* Clear ECX */
if (AddressSize) State->GeneralRegs[FAST486_REG_ECX].Long = 0;
else State->GeneralRegs[FAST486_REG_ECX].LowWord = 0;
}
/* Read from the source operand */
if (!Fast486ReadMemory(State,
Segment,
AddressSize ? State->GeneralRegs[FAST486_REG_ESI].Long
: State->GeneralRegs[FAST486_REG_ESI].LowWord,
FALSE,
&State->GeneralRegs[FAST486_REG_EAX].Long,
DataSize))
{
/* Exception occurred */
return;
}
/* Increment/decrement ESI */
if (AddressSize)
{
if (!State->Flags.Df) State->GeneralRegs[FAST486_REG_ESI].Long += DataSize;
else State->GeneralRegs[FAST486_REG_ESI].Long -= DataSize;
}
else
{
if (!State->Flags.Df) State->GeneralRegs[FAST486_REG_ESI].LowWord += DataSize;
else State->GeneralRegs[FAST486_REG_ESI].LowWord -= DataSize;
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeScas)
{
ULONG FirstValue = State->GeneralRegs[FAST486_REG_EAX].Long;
ULONG SecondValue = 0;
ULONG Result;
ULONG DataSize, DataMask, SignFlag;
BOOLEAN OperandSize, AddressSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xAE);
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
if ((State->PrefixFlags & FAST486_PREFIX_REP)
|| (State->PrefixFlags & FAST486_PREFIX_REPNZ))
{
if ((AddressSize && (State->GeneralRegs[FAST486_REG_ECX].Long == 0))
|| (!AddressSize && (State->GeneralRegs[FAST486_REG_ECX].LowWord == 0)))
{
/* Do nothing */
return;
}
}
/* Calculate the size */
if (Opcode == 0xAE) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
/* Calculate the mask and sign flag */
SignFlag = 1 << ((DataSize * 8) - 1);
DataMask = SignFlag | (SignFlag - 1);
/* Read from the source operand */
if (!Fast486ReadMemory(State,
FAST486_REG_ES,
AddressSize ? State->GeneralRegs[FAST486_REG_EDI].Long
: State->GeneralRegs[FAST486_REG_EDI].LowWord,
FALSE,
&SecondValue,
DataSize))
{
/* Exception occurred */
return;
}
/* Calculate the result */
FirstValue &= DataMask;
SecondValue &= DataMask;
Result = (FirstValue - SecondValue) & DataMask;
/* Update the flags */
State->Flags.Cf = (FirstValue < SecondValue);
State->Flags.Of = ((FirstValue & SignFlag) != (SecondValue & SignFlag))
&& ((FirstValue & SignFlag) != (Result & SignFlag));
State->Flags.Af = (FirstValue & 0x0F) < (SecondValue & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SignFlag) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Increment/decrement EDI */
if (AddressSize)
{
if (!State->Flags.Df) State->GeneralRegs[FAST486_REG_EDI].Long += DataSize;
else State->GeneralRegs[FAST486_REG_EDI].Long -= DataSize;
}
else
{
if (!State->Flags.Df) State->GeneralRegs[FAST486_REG_EDI].LowWord += DataSize;
else State->GeneralRegs[FAST486_REG_EDI].LowWord -= DataSize;
}
// FIXME: This method is slow!
if ((State->PrefixFlags & FAST486_PREFIX_REP)
|| (State->PrefixFlags & FAST486_PREFIX_REPNZ))
{
BOOLEAN Repeat = TRUE;
if (AddressSize)
{
if ((--State->GeneralRegs[FAST486_REG_ECX].Long) == 0)
{
/* ECX is 0 */
Repeat = FALSE;
}
}
else
{
if ((--State->GeneralRegs[FAST486_REG_ECX].LowWord) == 0)
{
/* CX is 0 */
Repeat = FALSE;
}
}
if (((State->PrefixFlags & FAST486_PREFIX_REP) && !State->Flags.Zf)
|| ((State->PrefixFlags & FAST486_PREFIX_REPNZ) && State->Flags.Zf))
{
/* REPZ with ZF = 0 or REPNZ with ZF = 1 */
Repeat = FALSE;
}
if (Repeat)
{
/* Repeat the instruction */
State->InstPtr = State->SavedInstPtr;
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeIns)
{
ULONG DataSize;
BOOLEAN OperandSize, AddressSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0x6C);
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Calculate the size */
if (Opcode == 0x6C) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
if (State->PrefixFlags & (FAST486_PREFIX_REP | FAST486_PREFIX_REPNZ))
{
UCHAR Block[STRING_BLOCK_SIZE];
ULONG Count = AddressSize ? State->GeneralRegs[FAST486_REG_ECX].Long
: State->GeneralRegs[FAST486_REG_ECX].LowWord;
/* Clear the memory block */
RtlZeroMemory(Block, sizeof(Block));
/* Transfer until finished */
while (Count)
{
ULONG Processed = min(Count, STRING_BLOCK_SIZE / DataSize);
/* Simulate the 16-bit wrap-around of DI in 16-bit address mode */
if (!AddressSize)
{
ULONG MaxBytes = State->Flags.Df
? (ULONG)State->GeneralRegs[FAST486_REG_EDI].LowWord
: (0x10000 - (ULONG)State->GeneralRegs[FAST486_REG_EDI].LowWord);
Processed = min(Processed, MaxBytes / DataSize);
if (Processed == 0) Processed = 1;
}
/* Read from the I/O port */
State->IoReadCallback(State,
State->GeneralRegs[FAST486_REG_EDX].LowWord,
Block,
Processed,
DataSize);
if (State->Flags.Df)
{
ULONG i, j;
/* Reduce EDI by the number of bytes to transfer */
if (AddressSize) State->GeneralRegs[FAST486_REG_EDI].Long -= Processed * DataSize;
else State->GeneralRegs[FAST486_REG_EDI].LowWord -= Processed * DataSize;
/* Reverse the block data */
for (i = 0; i < Processed / 2; i++)
{
/* Swap the values */
for (j = 0; j < DataSize; j++)
{
UCHAR Temp = Block[i * DataSize + j];
Block[i * DataSize + j] = Block[(Processed - i - 1) * DataSize + j];
Block[(Processed - i - 1) * DataSize + j] = Temp;
}
}
}
/* Write to memory */
if (!Fast486WriteMemory(State,
FAST486_REG_ES,
AddressSize ? State->GeneralRegs[FAST486_REG_EDI].Long
: State->GeneralRegs[FAST486_REG_EDI].LowWord,
Block,
Processed * DataSize))
{
/* Set ECX */
if (AddressSize) State->GeneralRegs[FAST486_REG_ECX].Long = Count;
else State->GeneralRegs[FAST486_REG_ECX].LowWord = LOWORD(Count);
/* Exception occurred */
return;
}
if (!State->Flags.Df)
{
/* Increase EDI by the number of bytes transfered */
if (AddressSize) State->GeneralRegs[FAST486_REG_EDI].Long += Processed * DataSize;
else State->GeneralRegs[FAST486_REG_EDI].LowWord += Processed * DataSize;
}
/* Reduce the total count by the number processed in this run */
Count -= Processed;
}
/* Clear ECX */
if (AddressSize) State->GeneralRegs[FAST486_REG_ECX].Long = 0;
else State->GeneralRegs[FAST486_REG_ECX].LowWord = 0;
}
else
{
ULONG Data = 0;
/* Read from the I/O port */
State->IoReadCallback(State,
State->GeneralRegs[FAST486_REG_EDX].LowWord,
&Data,
1,
DataSize);
/* Write to the destination operand */
if (!Fast486WriteMemory(State,
FAST486_REG_ES,
AddressSize ? State->GeneralRegs[FAST486_REG_EDI].Long
: State->GeneralRegs[FAST486_REG_EDI].LowWord,
&Data,
DataSize))
{
/* Exception occurred */
return;
}
/* Increment/decrement EDI */
if (AddressSize)
{
if (!State->Flags.Df) State->GeneralRegs[FAST486_REG_EDI].Long += DataSize;
else State->GeneralRegs[FAST486_REG_EDI].Long -= DataSize;
}
else
{
if (!State->Flags.Df) State->GeneralRegs[FAST486_REG_EDI].LowWord += DataSize;
else State->GeneralRegs[FAST486_REG_EDI].LowWord -= DataSize;
}
}
}
FAST486_OPCODE_HANDLER(Fast486OpcodeOuts)
{
ULONG DataSize;
BOOLEAN OperandSize, AddressSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0x6E);
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Calculate the size */
if (Opcode == 0x6E) DataSize = sizeof(UCHAR);
else DataSize = OperandSize ? sizeof(ULONG) : sizeof(USHORT);
if (State->PrefixFlags & (FAST486_PREFIX_REP | FAST486_PREFIX_REPNZ))
{
UCHAR Block[STRING_BLOCK_SIZE];
ULONG Count = AddressSize ? State->GeneralRegs[FAST486_REG_ECX].Long
: State->GeneralRegs[FAST486_REG_ECX].LowWord;
/* Clear the memory block */
RtlZeroMemory(Block, sizeof(Block));
/* Transfer until finished */
while (Count)
{
ULONG Processed = min(Count, STRING_BLOCK_SIZE / DataSize);
/* Simulate the 16-bit wrap-around of DI in 16-bit address mode */
if (!AddressSize)
{
ULONG MaxBytes = State->Flags.Df
? (ULONG)State->GeneralRegs[FAST486_REG_ESI].LowWord
: (0x10000 - (ULONG)State->GeneralRegs[FAST486_REG_ESI].LowWord);
Processed = min(Processed, MaxBytes / DataSize);
if (Processed == 0) Processed = 1;
}
/* Read from memory */
if (!Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
? State->SegmentOverride : FAST486_REG_DS,
AddressSize ? State->GeneralRegs[FAST486_REG_ESI].Long
: State->GeneralRegs[FAST486_REG_ESI].LowWord,
FALSE,
Block,
Processed * DataSize))
{
/* Set ECX */
if (AddressSize) State->GeneralRegs[FAST486_REG_ECX].Long = Count;
else State->GeneralRegs[FAST486_REG_ECX].LowWord = LOWORD(Count);
/* Exception occurred */
return;
}
if (State->Flags.Df)
{
ULONG i, j;
/* Reduce ESI by the number of bytes to transfer */
if (AddressSize) State->GeneralRegs[FAST486_REG_ESI].Long -= Processed * DataSize;
else State->GeneralRegs[FAST486_REG_ESI].LowWord -= Processed * DataSize;
/* Reverse the block data */
for (i = 0; i < Processed / 2; i++)
{
/* Swap the values */
for (j = 0; j < DataSize; j++)
{
UCHAR Temp = Block[i * DataSize + j];
Block[i * DataSize + j] = Block[(Processed - i - 1) * DataSize + j];
Block[(Processed - i - 1) * DataSize + j] = Temp;
}
}
}
/* Write to the I/O port */
State->IoWriteCallback(State,
State->GeneralRegs[FAST486_REG_EDX].LowWord,
Block,
Processed,
DataSize);
if (!State->Flags.Df)
{
/* Increase ESI by the number of bytes transfered */
if (AddressSize) State->GeneralRegs[FAST486_REG_ESI].Long += Processed * DataSize;
else State->GeneralRegs[FAST486_REG_ESI].LowWord += Processed * DataSize;
}
/* Reduce the total count by the number processed in this run */
Count -= Processed;
}
/* Clear ECX */
if (AddressSize) State->GeneralRegs[FAST486_REG_ECX].Long = 0;
else State->GeneralRegs[FAST486_REG_ECX].LowWord = 0;
}
else
{
ULONG Data = 0;
/* Read from the source operand */
if (!Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
? State->SegmentOverride : FAST486_REG_DS,
AddressSize ? State->GeneralRegs[FAST486_REG_ESI].Long
: State->GeneralRegs[FAST486_REG_ESI].LowWord,
FALSE,
&Data,
DataSize))
{
/* Exception occurred */
return;
}
/* Write to the I/O port */
State->IoWriteCallback(State,
State->GeneralRegs[FAST486_REG_EDX].LowWord,
&Data,
1,
DataSize);
/* Increment/decrement ESI */
if (AddressSize)
{
if (!State->Flags.Df) State->GeneralRegs[FAST486_REG_ESI].Long += DataSize;
else State->GeneralRegs[FAST486_REG_ESI].Long -= DataSize;
}
else
{
if (!State->Flags.Df) State->GeneralRegs[FAST486_REG_ESI].LowWord += DataSize;
else State->GeneralRegs[FAST486_REG_ESI].LowWord -= DataSize;
}
}
}
/* EOF */
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