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/*
* plex86: run multiple x86 operating systems concurrently
* Copyright (C) 1999-2001 Kevin P. Lawton
*
* segment_ctrl.c: emulation of segment control 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_SwEw(vm_t *vm)
{
Bit16u op2_16;
if (vm->i.mod == 0xc0) {
op2_16 = ReadReg16(vm, vm->i.rm);
}
else {
read_virtual_word(vm, vm->i.seg, vm->i.rm_addr, &op2_16);
}
load_seg_reg(vm, vm->i.nnn, op2_16);
if (vm->i.nnn == SRegSS) {
/* MOV SS inhibits interrupts, debug exceptions and single-step */
/* trap exceptions until the execution boundary following the */
/* next instruction is reached. */
/* Same code as POP_SS() */
vm->guest_cpu.inhibit_mask |= INHIBIT_INTERRUPTS | INHIBIT_DEBUG;
vm->guest_cpu.async_event = 1;
}
}
void
POP_SREG(vm_t *vm, unsigned sreg)
{
Bit16u sel16;
if (vm->i.os_32) {
Bit32u sel32;
pop32(vm, &sel32);
sel16 = sel32;
}
else {
pop16(vm, &sel16);
}
load_seg_reg(vm, sreg, sel16);
if (sreg == SRegSS) {
/* POP SS inhibits interrupts, debug exceptions and single-step */
/* trap exceptions until the execution boundary following the */
/* next instruction is reached. */
/* Same code as MOV_SwEw() */
vm->guest_cpu.inhibit_mask |= INHIBIT_INTERRUPTS | INHIBIT_DEBUG;
vm->guest_cpu.async_event = 1;
}
}
void
LxS_GvMp(vm_t *vm, unsigned sreg)
{
if (vm->i.mod == 0xc0) {
/* (BW) NT seems to use this when booting. */
monpanic(vm, "invalid use of LxS, must use memory reference!\n");
UndefinedOpcode(vm);
}
if (vm->i.os_32) {
Bit32u reg_32;
Bit16u xs_raw;
read_virtual_dword(vm, vm->i.seg, vm->i.rm_addr, ®_32);
read_virtual_word(vm, vm->i.seg, vm->i.rm_addr + 4, &xs_raw);
load_seg_reg(vm, sreg, xs_raw);
WriteReg32(vm, vm->i.nnn, reg_32);
}
else { /* 16 bit operand size */
Bit16u reg_16;
Bit16u xs_raw;
read_virtual_word(vm, vm->i.seg, vm->i.rm_addr, ®_16);
read_virtual_word(vm, vm->i.seg, vm->i.rm_addr + 2, &xs_raw);
load_seg_reg(vm, sreg, xs_raw);
WriteReg16(vm, vm->i.nnn, reg_16);
}
}
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