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/*
* plex86: run multiple x86 operating systems concurrently
* Copyright (C) 1999-2001 Kevin P. Lawton
*
* data_xfer8.c: emulation of 8-bit data transfer instructions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "plex86.h"
#include "monitor.h"
void
MOV_GbEb(vm_t *vm)
{
Bit8u op2_8;
if (vm->i.mod == 0xc0) {
op2_8 = ReadReg8(vm, vm->i.rm);
}
else {
read_virtual_byte(vm, vm->i.seg, vm->i.rm_addr, &op2_8);
}
WriteReg8(vm, vm->i.nnn, op2_8);
}
void
MOV_EbGb(vm_t *vm)
{
Bit8u op2;
op2 = ReadReg8(vm, vm->i.nnn);
if (vm->i.mod == 0xc0) {
WriteReg8(vm, vm->i.rm, op2);
}
else {
write_virtual_byte(vm, vm->i.seg, vm->i.rm_addr, &op2);
}
}
void
MOV_EbIb(vm_t *vm)
{
Bit8u op2;
op2 = vm->i.Ib;
if (vm->i.mod == 0xc0) {
WriteReg8(vm, vm->i.rm, op2);
}
else {
write_virtual_byte(vm, vm->i.seg, vm->i.rm_addr, &op2);
}
}
void
MOV_ObAL(vm_t *vm)
{
Bit8u temp_8;
Bit32u addr_32;
addr_32 = vm->i.Id;
/* read from register */
temp_8 = G_AL(vm);
/* write to memory address */
if (!NULL_SEG_REG(vm->i.seg)) {
write_virtual_byte(vm, vm->i.seg, addr_32, &temp_8);
}
else {
write_virtual_byte(vm, SRegDS, addr_32, &temp_8);
}
}
void
MOV_ALOb(vm_t *vm)
{
Bit8u temp_8;
Bit32u addr_32;
addr_32 = vm->i.Id;
if (!NULL_SEG_REG(vm->i.seg)) {
read_virtual_byte(vm, vm->i.seg, addr_32, &temp_8);
}
else {
read_virtual_byte(vm, SRegDS, addr_32, &temp_8);
}
G_AL(vm) = temp_8;
}
void
XCHG_EbGb(vm_t *vm)
{
Bit8u op2, op1;
op2 = ReadReg8(vm, vm->i.nnn);
if (vm->i.mod == 0xc0) {
op1 = ReadReg8(vm, vm->i.rm);
WriteReg8(vm, vm->i.rm, op2);
}
else {
read_RMW_virtual_byte(vm, vm->i.seg, vm->i.rm_addr, &op1);
write_RMW_virtual_byte(vm, &op2);
}
WriteReg8(vm, vm->i.nnn, op1);
}
void
XLAT(vm_t *vm)
{
Bit32u offset_32;
Bit8u al;
if (vm->i.as_32) {
offset_32 = G_EBX(vm) + G_AL(vm);
}
else {
offset_32 = G_BX(vm) + G_AL(vm);
}
if ( !NULL_SEG_REG(vm->i.seg) ) {
read_virtual_byte(vm, vm->i.seg, offset_32, &al);
}
else {
read_virtual_byte(vm, SRegDS, offset_32, &al);
}
G_AL(vm) = al;
}
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