/*
* Fast486 386/486 CPU Emulation Library
* extraops.c
*
* Copyright (C) 2015 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 "common.h"
#include "opgroups.h"
#include "extraops.h"
/* PUBLIC VARIABLES ***********************************************************/
FAST486_OPCODE_HANDLER_PROC
Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
{
Fast486ExtOpcodeGroup0F00, /* 0x00 - 0x01 */
Fast486ExtOpcodeGroup0F01,
Fast486ExtOpcodeLar, /* 0x02 */
Fast486ExtOpcodeLsl, /* 0x03 */
Fast486ExtOpcodeInvalid, /* 0x04 - 0x05 */ // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeClts, /* 0x06 */
Fast486ExtOpcodeInvalid, /* 0x07 */ // Invalid
Fast486ExtOpcodeUnimplemented, // TODO: OPCODE 0x08 NOT IMPLEMENTED
Fast486ExtOpcodeUnimplemented, // TODO: OPCODE 0x09 NOT IMPLEMENTED
Fast486ExtOpcodeInvalid, /* 0x0A */ // Invalid
Fast486ExtOpcode0F0B, /* 0x0B */ // Reserved (UD2)
Fast486ExtOpcodeInvalid, /* 0x0C - 0x1F */ // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeStoreControlReg, /* 0x20 */
Fast486ExtOpcodeStoreDebugReg, /* 0x21 */
Fast486ExtOpcodeLoadControlReg, /* 0x22 */
Fast486ExtOpcodeLoadDebugReg, /* 0x23 */
Fast486ExtOpcodeUnimplemented, // TODO: OPCODE 0x24 NOT IMPLEMENTED
Fast486ExtOpcodeInvalid, /* 0x25 */ // Invalid
Fast486ExtOpcodeUnimplemented, // TODO: OPCODE 0x26 NOT IMPLEMENTED
Fast486ExtOpcodeInvalid, /* 0x27 - 0x7F */ // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeConditionalJmp, /* 0x80 - 0x8F */
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalJmp,
Fast486ExtOpcodeConditionalSet, /* 0x90 - 0x9F */
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodeConditionalSet,
Fast486ExtOpcodePushFs, /* 0xA0 */
Fast486ExtOpcodePopFs, /* 0xA1 */
Fast486ExtOpcodeInvalid, /* 0xA2 */ // Invalid
Fast486ExtOpcodeBitTest, /* 0xA3 */
Fast486ExtOpcodeShld, /* 0xA4 - 0xA5 */
Fast486ExtOpcodeShld,
Fast486ExtOpcodeInvalid, /* 0xA6 - 0xA7 */ // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodePushGs, /* 0xA8 - 0xA9 */
Fast486ExtOpcodePopGs,
Fast486ExtOpcodeInvalid, /* 0xAA */ // Invalid
Fast486ExtOpcodeBts, /* 0xAB */
Fast486ExtOpcodeShrd, /* 0xAC - 0xAD */
Fast486ExtOpcodeShrd,
Fast486ExtOpcodeInvalid, /* 0xAE */ // Invalid
Fast486ExtOpcodeImul, /* 0xAF */
Fast486ExtOpcodeCmpXchgByte, /* 0xB0 */
Fast486ExtOpcodeCmpXchg, /* 0xB1 */
Fast486ExtOpcodeLss, /* 0xB2 */
Fast486ExtOpcodeBtr, /* 0xB3 */
Fast486ExtOpcodeLfsLgs, /* 0xB4 - 0xB5 */
Fast486ExtOpcodeLfsLgs,
Fast486ExtOpcodeMovzxByte, /* 0xB6 - 0xB7 */
Fast486ExtOpcodeMovzxWord,
Fast486ExtOpcodeInvalid, /* 0xB8 */ // Invalid
Fast486ExtOpcodeGroup0FB9, /* 0xB9 */
Fast486ExtOpcodeGroup0FBA, /* 0xBA */
Fast486ExtOpcodeBtc, /* 0xBB */
Fast486ExtOpcodeBsf, /* 0xBC */
Fast486ExtOpcodeBsr, /* 0xBD */
Fast486ExtOpcodeMovsxByte, /* 0xBE - 0xBF */
Fast486ExtOpcodeMovsxWord,
Fast486ExtOpcodeXaddByte, /* 0xC0 - 0xC1 */
Fast486ExtOpcodeXadd,
Fast486ExtOpcodeInvalid, /* 0xC2 - 0xC7 */ // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeBswap, /* 0xC8 - 0xCF */
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeBswap,
Fast486ExtOpcodeInvalid, /* 0xD0 - 0xFF */ // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
Fast486ExtOpcodeInvalid, // Invalid
};
/* PUBLIC FUNCTIONS ***********************************************************/
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeInvalid)
{
DPRINT1("FAST486 -- Extended opcode 0x%02X is INVALID!\n", Opcode);
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeUnimplemented)
{
DPRINT1("FAST486 -- Extended opcode 0x%02X is UNIMPLEMENTED\n", Opcode);
// Fast486Exception(State, FAST486_EXCEPTION_UD);
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcode0F0B)
{
/* Reserved opcode (UD2) */
Fast486Exception(State, FAST486_EXCEPTION_UD);
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLar)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN Valid;
USHORT Selector;
FAST486_GDT_ENTRY GdtEntry;
DWORD AccessRights;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
|| State->Flags.Vm)
{
/* Not recognized */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (OperandSize)
{
ULONG Value;
/* Read the value */
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
Selector = LOWORD(Value);
}
else
{
/* Read the value */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Selector))
{
/* Exception occurred */
return;
}
}
if (!Fast486ReadDescriptorEntry(State, Selector, &Valid, &GdtEntry))
{
/* Exception occurred */
return;
}
if (!Valid)
{
State->Flags.Zf = FALSE;
return;
}
/* Privilege check */
if (((GET_SEGMENT_RPL(Selector) > GdtEntry.Dpl))
|| (Fast486GetCurrentPrivLevel(State) > GdtEntry.Dpl))
{
State->Flags.Zf = FALSE;
return;
}
/* Set ZF */
State->Flags.Zf = TRUE;
/* Get the access rights */
AccessRights = ((PDWORD)&GdtEntry)[1] & 0x00F0FF00;
/* Return the access rights */
if (OperandSize) Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, AccessRights);
else Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(AccessRights));
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLsl)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN Valid;
USHORT Selector;
ULONG Limit;
FAST486_GDT_ENTRY GdtEntry;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
if (!(State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE)
|| State->Flags.Vm)
{
/* Not recognized */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
NO_LOCK_PREFIX();
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (OperandSize)
{
ULONG Value;
/* Read the value */
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
Selector = LOWORD(Value);
}
else
{
/* Read the value */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Selector))
{
/* Exception occurred */
return;
}
}
if (!Fast486ReadDescriptorEntry(State, Selector, &Valid, &GdtEntry))
{
/* Exception occurred */
return;
}
if (!Valid)
{
State->Flags.Zf = FALSE;
return;
}
/* Privilege check */
if (((GET_SEGMENT_RPL(Selector) > GdtEntry.Dpl))
|| (Fast486GetCurrentPrivLevel(State) > GdtEntry.Dpl))
{
State->Flags.Zf = FALSE;
return;
}
/* Calculate the limit */
Limit = GdtEntry.Limit | (GdtEntry.LimitHigh << 16);
if (GdtEntry.Granularity)
{
Limit <<= 12;
Limit |= 0x00000FFF;
}
/* Set ZF */
State->Flags.Zf = TRUE;
/* Return the limit */
if (OperandSize) Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, Limit);
else Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(Limit));
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeClts)
{
NO_LOCK_PREFIX();
/* The current privilege level must be zero */
if (Fast486GetCurrentPrivLevel(State) != 0)
{
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
/* Clear the task switch bit */
State->ControlRegisters[FAST486_REG_CR0] &= ~FAST486_CR0_TS;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeStoreControlReg)
{
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
NO_LOCK_PREFIX();
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* The current privilege level must be zero */
if (Fast486GetCurrentPrivLevel(State) != 0)
{
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
if ((ModRegRm.Register == 1) || (ModRegRm.Register > 3))
{
/* CR1, CR4, CR5, CR6 and CR7 don't exist */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (ModRegRm.Register != 0)
{
/* CR2 and CR3 and are stored in array indexes 1 and 2 */
ModRegRm.Register--;
}
/* Store the value of the control register */
State->GeneralRegs[ModRegRm.SecondRegister].Long = State->ControlRegisters[ModRegRm.Register];
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeStoreDebugReg)
{
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
NO_LOCK_PREFIX();
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* The current privilege level must be zero */
if (Fast486GetCurrentPrivLevel(State) != 0)
{
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
if ((ModRegRm.Register == 6) || (ModRegRm.Register == 7))
{
/* DR6 and DR7 are aliases to DR4 and DR5 */
ModRegRm.Register -= 2;
}
if (State->DebugRegisters[FAST486_REG_DR5] & FAST486_DR5_GD)
{
/* Disallow access to debug registers */
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
/* Store the value of the debug register */
State->GeneralRegs[ModRegRm.SecondRegister].Long = State->DebugRegisters[ModRegRm.Register];
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLoadControlReg)
{
ULONG Value;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
NO_LOCK_PREFIX();
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* The current privilege level must be zero */
if (Fast486GetCurrentPrivLevel(State) != 0)
{
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
if ((ModRegRm.Register == 1) || (ModRegRm.Register > 3))
{
/* CR1, CR4, CR5, CR6 and CR7 don't exist */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (ModRegRm.Register != 0)
{
/* CR2 and CR3 and are stored in array indexes 1 and 2 */
ModRegRm.Register--;
}
/* Get the value */
Value = State->GeneralRegs[ModRegRm.SecondRegister].Long;
if (ModRegRm.Register == (INT)FAST486_REG_CR0)
{
/* CR0 checks */
if (((Value & (FAST486_CR0_PG | FAST486_CR0_PE)) == FAST486_CR0_PG)
|| ((Value & (FAST486_CR0_CD | FAST486_CR0_NW)) == FAST486_CR0_NW))
{
/* Invalid value */
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
}
#ifndef FAST486_NO_PREFETCH
/* Changing CR0 or CR3 can interfere with prefetching (because of paging) */
State->PrefetchValid = FALSE;
#endif
if (ModRegRm.Register == (INT)FAST486_REG_CR3)
{
/* Flush the TLB */
Fast486FlushTlb(State);
}
/* Load a value to the control register */
State->ControlRegisters[ModRegRm.Register] = Value;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLoadDebugReg)
{
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
NO_LOCK_PREFIX();
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* The current privilege level must be zero */
if (Fast486GetCurrentPrivLevel(State) != 0)
{
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
if ((ModRegRm.Register == 6) || (ModRegRm.Register == 7))
{
/* DR6 and DR7 are aliases to DR4 and DR5 */
ModRegRm.Register -= 2;
}
if (State->DebugRegisters[FAST486_REG_DR5] & FAST486_DR5_GD)
{
/* Disallow access to debug registers */
Fast486Exception(State, FAST486_EXCEPTION_GP);
return;
}
/* Load a value to the debug register */
State->DebugRegisters[ModRegRm.Register] = State->GeneralRegs[ModRegRm.SecondRegister].Long;
if (ModRegRm.Register == (INT)FAST486_REG_DR4)
{
/* The reserved bits are 1 */
State->DebugRegisters[ModRegRm.Register] |= FAST486_DR4_RESERVED;
}
else if (ModRegRm.Register == (INT)FAST486_REG_DR5)
{
/* The reserved bits are 0 */
State->DebugRegisters[ModRegRm.Register] &= ~FAST486_DR5_RESERVED;
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePushFs)
{
/* Call the internal API */
Fast486StackPush(State, State->SegmentRegs[FAST486_REG_FS].Selector);
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePopFs)
{
ULONG NewSelector;
if (!Fast486StackPop(State, &NewSelector))
{
/* Exception occurred */
return;
}
/* Call the internal API */
Fast486LoadSegment(State, FAST486_REG_FS, LOWORD(NewSelector));
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBitTest)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
UINT DataSize;
ULONG BitNumber;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the number of bits */
if (OperandSize) DataSize = 32;
else DataSize = 16;
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Get the bit number */
BitNumber = OperandSize ? State->GeneralRegs[ModRegRm.Register].Long
: (ULONG)State->GeneralRegs[ModRegRm.Register].LowWord;
if (ModRegRm.Memory)
{
/*
* For memory operands, add the bit offset divided by
* the data size to the address
*/
ModRegRm.MemoryAddress += (BitNumber / DataSize) * (DataSize / 8);
}
/* Normalize the bit number */
BitNumber %= DataSize;
if (OperandSize)
{
ULONG Value;
/* Read the value */
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
/* Set CF to the bit value */
State->Flags.Cf = (Value >> BitNumber) & 1;
}
else
{
USHORT Value;
/* Read the value */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
/* Set CF to the bit value */
State->Flags.Cf = (Value >> BitNumber) & 1;
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeShld)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
UCHAR Count;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xA4);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (Opcode == 0xA4)
{
/* Fetch the count */
if (!Fast486FetchByte(State, &Count))
{
/* Exception occurred */
return;
}
}
else
{
/* The count is in CL */
Count = State->GeneralRegs[FAST486_REG_ECX].LowByte;
}
/* Normalize the count */
Count &= 0x1F;
/* Do nothing if the count is zero */
if (Count == 0) return;
if (OperandSize)
{
ULONG Source, Destination, Result;
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = (Destination << Count) | (Source >> (32 - Count));
/* Update flags */
State->Flags.Cf = (Destination >> (32 - Count)) & 1;
if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_LONG)
!= (Destination & SIGN_FLAG_LONG);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result);
}
else
{
USHORT Source, Destination, Result;
ULONG DoubleSource;
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return;
}
DoubleSource = Source | (Source << 16);
/* Calculate the result */
Result = (Destination << Count) | (DoubleSource >> (32 - Count));
/* Update flags */
if (Count <= 16) State->Flags.Cf = (Destination >> (16 - Count)) & 1;
else State->Flags.Cf = (Source >> (32 - Count)) & 1;
if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_WORD)
!= (Destination & SIGN_FLAG_WORD);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Result);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePushGs)
{
/* Call the internal API */
Fast486StackPush(State, State->SegmentRegs[FAST486_REG_GS].Selector);
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePopGs)
{
ULONG NewSelector;
if (!Fast486StackPop(State, &NewSelector))
{
/* Exception occurred */
return;
}
/* Call the internal API */
Fast486LoadSegment(State, FAST486_REG_GS, LOWORD(NewSelector));
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBts)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
UINT DataSize;
ULONG BitNumber;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the number of bits */
if (OperandSize) DataSize = 32;
else DataSize = 16;
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Get the bit number */
BitNumber = OperandSize ? State->GeneralRegs[ModRegRm.Register].Long
: (ULONG)State->GeneralRegs[ModRegRm.Register].LowWord;
if (ModRegRm.Memory)
{
/*
* For memory operands, add the bit offset divided by
* the data size to the address
*/
ModRegRm.MemoryAddress += (BitNumber / DataSize) * (DataSize / 8);
}
/* Normalize the bit number */
BitNumber %= DataSize;
if (OperandSize)
{
ULONG Value;
/* Read the value */
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
/* Set CF to the bit value */
State->Flags.Cf = (Value >> BitNumber) & 1;
/* Set the bit */
Value |= 1 << BitNumber;
/* Write back the result */
Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
}
else
{
USHORT Value;
/* Read the value */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
/* Set CF to the bit value */
State->Flags.Cf = (Value >> BitNumber) & 1;
/* Set the bit */
Value |= 1 << BitNumber;
/* Write back the result */
Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeShrd)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
UCHAR Count;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xAC);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (Opcode == 0xAC)
{
/* Fetch the count */
if (!Fast486FetchByte(State, &Count))
{
/* Exception occurred */
return;
}
}
else
{
/* The count is in CL */
Count = State->GeneralRegs[FAST486_REG_ECX].LowByte;
}
/* Normalize the count */
Count &= 0x1F;
/* Do nothing if the count is zero */
if (Count == 0) return;
if (OperandSize)
{
ULONG Source, Destination, Result;
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = (Destination >> Count) | (Source << (32 - Count));
/* Update flags */
State->Flags.Cf = (Destination >> (Count - 1)) & 1;
if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_LONG)
!= (Destination & SIGN_FLAG_LONG);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result);
}
else
{
USHORT Source, Destination, Result;
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = (Destination >> Count) | (Source << (16 - Count));
if (Count >= 16) Result |= (ULONG)(Source | (Source << 16)) >> (Count - 16);
/* Update flags */
if (Count <= 16) State->Flags.Cf = (Destination >> (Count - 1)) & 1;
else State->Flags.Cf = (Source >> (Count - 17)) & 1;
if (Count == 1) State->Flags.Of = (Result & SIGN_FLAG_WORD)
!= (Destination & SIGN_FLAG_WORD);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write back the result */
Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Result);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeImul)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (OperandSize)
{
LONG Source, Destination;
LONGLONG Result;
/* Read the operands */
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
(PULONG)&Destination,
(PULONG)&Source))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = (LONGLONG)Source * (LONGLONG)Destination;
/* Update the flags */
State->Flags.Cf = State->Flags.Of = ((Result < -2147483648LL) || (Result > 2147483647LL));
/* Write back the result */
Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, (ULONG)((LONG)Result));
}
else
{
SHORT Source, Destination;
LONG Result;
/* Read the operands */
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
(PUSHORT)&Destination,
(PUSHORT)&Source))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = (LONG)Source * (LONG)Destination;
/* Update the flags */
State->Flags.Cf = State->Flags.Of = ((Result < -32768) || (Result > 32767));
/* Write back the result */
Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, (USHORT)((SHORT)Result));
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchgByte)
{
FAST486_MOD_REG_RM ModRegRm;
UCHAR Accumulator = State->GeneralRegs[FAST486_REG_EAX].LowByte;
UCHAR Source, Destination, Result;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Read the operands */
if (!Fast486ReadModrmByteOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return;
}
/* Compare AL with the destination */
Result = Accumulator - Destination;
/* Update the flags */
State->Flags.Cf = (Accumulator < Destination);
State->Flags.Of = ((Accumulator & SIGN_FLAG_BYTE) != (Destination & SIGN_FLAG_BYTE))
&& ((Accumulator & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = (Accumulator & 0x0F) < (Destination & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
if (State->Flags.Zf)
{
/* Load the source operand into the destination */
Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Source);
}
else
{
/* Load the destination into AL */
State->GeneralRegs[FAST486_REG_EAX].LowByte = Destination;
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchg)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (OperandSize)
{
ULONG Source, Destination, Result;
ULONG Accumulator = State->GeneralRegs[FAST486_REG_EAX].Long;
/* Read the operands */
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return;
}
/* Compare EAX with the destination */
Result = Accumulator - Destination;
/* Update the flags */
State->Flags.Cf = (Accumulator < Destination);
State->Flags.Of = ((Accumulator & SIGN_FLAG_LONG) != (Destination & SIGN_FLAG_LONG))
&& ((Accumulator & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = (Accumulator & 0x0F) < (Destination & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
if (State->Flags.Zf)
{
/* Load the source operand into the destination */
Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Source);
}
else
{
/* Load the destination into EAX */
State->GeneralRegs[FAST486_REG_EAX].Long = Destination;
}
}
else
{
USHORT Source, Destination, Result;
USHORT Accumulator = State->GeneralRegs[FAST486_REG_EAX].LowWord;
/* Read the operands */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, &Source, &Destination))
{
/* Exception occurred */
return;
}
/* Compare AX with the destination */
Result = Accumulator - Destination;
/* Update the flags */
State->Flags.Cf = (Accumulator < Destination);
State->Flags.Of = ((Accumulator & SIGN_FLAG_WORD) != (Destination & SIGN_FLAG_WORD))
&& ((Accumulator & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = (Accumulator & 0x0F) < (Destination & 0x0F);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
if (State->Flags.Zf)
{
/* Load the source operand into the destination */
Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Source);
}
else
{
/* Load the destination into AX */
State->GeneralRegs[FAST486_REG_EAX].LowWord = Destination;
}
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLss)
{
UCHAR FarPointer[6];
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xB2);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!ModRegRm.Memory)
{
/* Invalid */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (!Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
? State->SegmentOverride : FAST486_REG_DS,
ModRegRm.MemoryAddress,
FALSE,
FarPointer,
OperandSize ? 6 : 4))
{
/* Exception occurred */
return;
}
if (OperandSize)
{
ULONG Offset = *((PULONG)FarPointer);
USHORT Segment = *((PUSHORT)&FarPointer[sizeof(ULONG)]);
/* Set the register to the offset */
State->GeneralRegs[ModRegRm.Register].Long = Offset;
/* Load the segment */
Fast486LoadSegment(State, FAST486_REG_SS, Segment);
}
else
{
USHORT Offset = *((PUSHORT)FarPointer);
USHORT Segment = *((PUSHORT)&FarPointer[sizeof(USHORT)]);
/* Set the register to the offset */
State->GeneralRegs[ModRegRm.Register].LowWord = Offset;
/* Load the segment */
Fast486LoadSegment(State, FAST486_REG_SS, Segment);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtr)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
UINT DataSize;
ULONG BitNumber;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the number of bits */
if (OperandSize) DataSize = 32;
else DataSize = 16;
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Get the bit number */
BitNumber = OperandSize ? State->GeneralRegs[ModRegRm.Register].Long
: (ULONG)State->GeneralRegs[ModRegRm.Register].LowWord;
if (ModRegRm.Memory)
{
/*
* For memory operands, add the bit offset divided by
* the data size to the address
*/
ModRegRm.MemoryAddress += (BitNumber / DataSize) * (DataSize / 8);
}
/* Normalize the bit number */
BitNumber %= DataSize;
if (OperandSize)
{
ULONG Value;
/* Read the value */
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
/* Set CF to the bit value */
State->Flags.Cf = (Value >> BitNumber) & 1;
/* Clear the bit */
Value &= ~(1 << BitNumber);
/* Write back the result */
Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
}
else
{
USHORT Value;
/* Read the value */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
/* Set CF to the bit value */
State->Flags.Cf = (Value >> BitNumber) & 1;
/* Clear the bit */
Value &= ~(1 << BitNumber);
/* Write back the result */
Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLfsLgs)
{
UCHAR FarPointer[6];
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xB4);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!ModRegRm.Memory)
{
/* Invalid */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return;
}
if (!Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
? State->SegmentOverride : FAST486_REG_DS,
ModRegRm.MemoryAddress,
FALSE,
FarPointer,
OperandSize ? 6 : 4))
{
/* Exception occurred */
return;
}
if (OperandSize)
{
ULONG Offset = *((PULONG)FarPointer);
USHORT Segment = *((PUSHORT)&FarPointer[sizeof(ULONG)]);
/* Set the register to the offset */
State->GeneralRegs[ModRegRm.Register].Long = Offset;
/* Load the segment */
Fast486LoadSegment(State,
(Opcode == 0xB4)
? FAST486_REG_FS : FAST486_REG_GS,
Segment);
}
else
{
USHORT Offset = *((PUSHORT)FarPointer);
USHORT Segment = *((PUSHORT)&FarPointer[sizeof(USHORT)]);
/* Set the register to the offset */
State->GeneralRegs[ModRegRm.Register].LowWord = Offset;
/* Load the segment */
Fast486LoadSegment(State,
(Opcode == 0xB4)
? FAST486_REG_FS : FAST486_REG_GS,
Segment);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovzxByte)
{
UCHAR Value;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xB6);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Read the operands */
if (!Fast486ReadModrmByteOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
/* Write back the zero-extended value */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
(ULONG)Value);
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovzxWord)
{
USHORT Value;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xB7);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Read the operands */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
/* Write back the zero-extended value */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
(ULONG)Value);
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtc)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
UINT DataSize;
ULONG BitNumber;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the number of bits */
if (OperandSize) DataSize = 32;
else DataSize = 16;
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Get the bit number */
BitNumber = OperandSize ? State->GeneralRegs[ModRegRm.Register].Long
: (ULONG)State->GeneralRegs[ModRegRm.Register].LowWord;
if (ModRegRm.Memory)
{
/*
* For memory operands, add the bit offset divided by
* the data size to the address
*/
ModRegRm.MemoryAddress += (BitNumber / DataSize) * (DataSize / 8);
}
/* Normalize the bit number */
BitNumber %= DataSize;
if (OperandSize)
{
ULONG Value;
/* Read the value */
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
/* Set CF to the bit value */
State->Flags.Cf = (Value >> BitNumber) & 1;
/* Toggle the bit */
Value ^= 1 << BitNumber;
/* Write back the result */
Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Value);
}
else
{
USHORT Value;
/* Read the value */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
/* Set CF to the bit value */
State->Flags.Cf = (Value >> BitNumber) & 1;
/* Toggle the bit */
Value ^= 1 << BitNumber;
/* Write back the result */
Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Value);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBsf)
{
UINT i;
ULONG Value = 0;
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
ULONG BitNumber;
UINT DataSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xBC);
/* Get the number of bits */
if (OperandSize) DataSize = 32;
else DataSize = 16;
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Read the value */
if (OperandSize)
{
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
}
else
{
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
(PUSHORT)NULL,
(PUSHORT)&Value))
{
/* Exception occurred */
return;
}
}
/* Set ZF */
State->Flags.Zf = (Value == 0);
if (State->Flags.Zf) return;
for (i = 0; i < DataSize; i++)
{
if (Value & (1 << i))
{
/* Save the bit number */
BitNumber = i;
/* Exit the loop */
break;
}
}
/* Write back the result */
if (OperandSize) Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, BitNumber);
else Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(BitNumber));
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBsr)
{
INT i;
ULONG Value = 0;
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
ULONG BitNumber;
UINT DataSize;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xBD);
/* Get the number of bits */
if (OperandSize) DataSize = 32;
else DataSize = 16;
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Read the value */
if (OperandSize)
{
if (!Fast486ReadModrmDwordOperands(State, &ModRegRm, NULL, &Value))
{
/* Exception occurred */
return;
}
}
else
{
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
(PUSHORT)NULL,
(PUSHORT)&Value))
{
/* Exception occurred */
return;
}
}
/* Set ZF according to the value */
State->Flags.Zf = (Value == 0);
if (State->Flags.Zf) return;
for (i = DataSize - 1; i >= 0; i--)
{
if (Value & (1 << i))
{
/* Save the bit number */
BitNumber = i;
/* Exit the loop */
break;
}
}
/* Write back the result */
if (OperandSize) Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, BitNumber);
else Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, LOWORD(BitNumber));
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovsxByte)
{
CHAR Value;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xBE);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Read the operands */
if (!Fast486ReadModrmByteOperands(State, &ModRegRm, NULL, (PUCHAR)&Value))
{
/* Exception occurred */
return;
}
/* Write back the sign-extended value */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
(ULONG)((LONG)Value));
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovsxWord)
{
SHORT Value;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
TOGGLE_ADSIZE(AddressSize);
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xBF);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Read the operands */
if (!Fast486ReadModrmWordOperands(State, &ModRegRm, NULL, (PUSHORT)&Value))
{
/* Exception occurred */
return;
}
/* Write back the sign-extended value */
Fast486WriteModrmDwordOperands(State,
&ModRegRm,
TRUE,
(ULONG)((LONG)Value));
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalJmp)
{
BOOLEAN Jump = FALSE;
LONG Offset = 0;
BOOLEAN Size = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(Size);
NO_LOCK_PREFIX();
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF0) == 0x80);
/* Fetch the offset */
if (Size)
{
if (!Fast486FetchDword(State, (PULONG)&Offset))
{
/* Exception occurred */
return;
}
}
else
{
SHORT Value;
if (!Fast486FetchWord(State, (PUSHORT)&Value))
{
/* Exception occurred */
return;
}
/* Sign-extend */
Offset = (LONG)Value;
}
switch ((Opcode & 0x0F) >> 1)
{
/* JO / JNO */
case 0:
{
Jump = State->Flags.Of;
break;
}
/* JC / JNC */
case 1:
{
Jump = State->Flags.Cf;
break;
}
/* JZ / JNZ */
case 2:
{
Jump = State->Flags.Zf;
break;
}
/* JBE / JNBE */
case 3:
{
Jump = State->Flags.Cf || State->Flags.Zf;
break;
}
/* JS / JNS */
case 4:
{
Jump = State->Flags.Sf;
break;
}
/* JP / JNP */
case 5:
{
Jump = State->Flags.Pf;
break;
}
/* JL / JNL */
case 6:
{
Jump = State->Flags.Sf != State->Flags.Of;
break;
}
/* JLE / JNLE */
case 7:
{
Jump = (State->Flags.Sf != State->Flags.Of) || State->Flags.Zf;
break;
}
}
if (Opcode & 1)
{
/* Invert the result */
Jump = !Jump;
}
if (Jump)
{
/* Move the instruction pointer */
State->InstPtr.Long += Offset;
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalSet)
{
BOOLEAN Value = FALSE;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
FAST486_MOD_REG_RM ModRegRm;
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xF0) == 0x90);
switch ((Opcode & 0x0F) >> 1)
{
/* SETO / SETNO */
case 0:
{
Value = State->Flags.Of;
break;
}
/* SETC / SETNC */
case 1:
{
Value = State->Flags.Cf;
break;
}
/* SETZ / SETNZ */
case 2:
{
Value = State->Flags.Zf;
break;
}
/* SETBE / SETNBE */
case 3:
{
Value = State->Flags.Cf || State->Flags.Zf;
break;
}
/* SETS / SETNS */
case 4:
{
Value = State->Flags.Sf;
break;
}
/* SETP / SETNP */
case 5:
{
Value = State->Flags.Pf;
break;
}
/* SETL / SETNL */
case 6:
{
Value = State->Flags.Sf != State->Flags.Of;
break;
}
/* SETLE / SETNLE */
case 7:
{
Value = (State->Flags.Sf != State->Flags.Of) || State->Flags.Zf;
break;
}
}
if (Opcode & 1)
{
/* Invert the result */
Value = !Value;
}
/* Write back the result */
Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Value);
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXaddByte)
{
UCHAR Source, Destination, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xC0);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&Source,
&Destination))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = Source + Destination;
/* Update the flags */
State->Flags.Cf = (Result < Source) && (Result < Destination);
State->Flags.Of = ((Source & SIGN_FLAG_BYTE) == (Destination & SIGN_FLAG_BYTE))
&& ((Source & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = ((((Source & 0x0F) + (Destination & 0x0F)) & 0x10) != 0);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write the sum to the destination */
if (!Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Result))
{
/* Exception occurred */
return;
}
/* Write the old value of the destination to the source */
Fast486WriteModrmByteOperands(State, &ModRegRm, TRUE, Destination);
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXadd)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xC1);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return;
}
/* Check the operand size */
if (OperandSize)
{
ULONG Source, Destination, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&Source,
&Destination))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = Source + Destination;
/* Update the flags */
State->Flags.Cf = (Result < Source) && (Result < Destination);
State->Flags.Of = ((Source & SIGN_FLAG_LONG) == (Destination & SIGN_FLAG_LONG))
&& ((Source & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = ((((Source & 0x0F) + (Destination & 0x0F)) & 0x10) != 0);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_LONG) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write the old value of the destination to the source */
if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, Destination))
{
/* Exception occurred */
return;
}
/* Write the sum to the destination */
Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result);
}
else
{
USHORT Source, Destination, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&Source,
&Destination))
{
/* Exception occurred */
return;
}
/* Calculate the result */
Result = Source + Destination;
/* Update the flags */
State->Flags.Cf = (Result < Source) && (Result < Destination);
State->Flags.Of = ((Source & SIGN_FLAG_WORD) == (Destination & SIGN_FLAG_WORD))
&& ((Source & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = ((((Source & 0x0F) + (Destination & 0x0F)) & 0x10) != 0);
State->Flags.Zf = (Result == 0);
State->Flags.Sf = ((Result & SIGN_FLAG_WORD) != 0);
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write the old value of the destination to the source */
if (!Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, Destination))
{
/* Exception occurred */
return;
}
/* Write the sum to the destination */
Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Result);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBswap)
{
PUCHAR Pointer;
NO_LOCK_PREFIX();
/* Get a pointer to the value */
Pointer = (PUCHAR)&State->GeneralRegs[Opcode & 0x07].Long;
/* Swap the byte order */
SWAP(Pointer[0], Pointer[3]);
SWAP(Pointer[1], Pointer[2]);
}
FAST486_OPCODE_HANDLER(Fast486OpcodeExtended)
{
UCHAR SecondOpcode;
/* Fetch the second operation code */
if (!Fast486FetchByte(State, &SecondOpcode))
{
/* Exception occurred */
return;
}
/* Call the extended opcode handler */
Fast486ExtendedHandlers[SecondOpcode](State, SecondOpcode);
}
/* EOF */