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/*
* plex86: run multiple x86 operating systems concurrently
* Copyright (C) 1999-2001 Kevin P. Lawton
*
* regs.c: access guest registers (convience functions)
*
* 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"
Bit32u
ReadReg32(vm_t *vm, unsigned reg)
{
Bit32u *reg_p;
if (reg == RegESP)
reg_p = &vm->guest.addr.guest_context->esp;
else
reg_p = &vm->guest.addr.guest_context->eax - reg;
return(*reg_p);
}
Bit16u
ReadReg16(vm_t *vm, unsigned reg)
{
Bit16u *reg_p;
if (reg == RegESP) {
reg_p = (Bit16u *) &vm->guest.addr.guest_context->esp;
}
else {
reg_p = (Bit16u *) (&vm->guest.addr.guest_context->eax - reg);
}
return(*reg_p);
}
Bit8u
ReadReg8(vm_t *vm, unsigned reg)
{
Bit8u *reg_p;
if (reg < 4) {
/* AL,CL,DL,BL */
reg_p = (Bit8u *) (&vm->guest.addr.guest_context->eax - reg);
return(*reg_p);
}
else {
/* AH,CH,DH,BH */
reg_p = (Bit8u *) (&vm->guest.addr.guest_context->eax - (reg-4));
reg_p++;
return(*reg_p);
}
}
void
WriteReg32(vm_t *vm, unsigned reg, Bit32u val)
{
if (reg == RegESP)
G_ESP(vm) = val;
else {
Bit32u *reg_p;
reg_p = &vm->guest.addr.guest_context->eax - reg;
*reg_p = val;
}
}
void
WriteReg16(vm_t *vm, unsigned reg, Bit16u val)
{
if (reg == RegESP) {
G_SP(vm) = val;
}
else {
Bit16u *reg_p;
reg_p = (Bit16u *) (&vm->guest.addr.guest_context->eax - reg);
*reg_p = val;
}
}
void
WriteReg8(vm_t *vm, unsigned reg, Bit8u val)
{
Bit8u *reg_p;
if (reg < 4) {
/* AL,CL,DL,BL */
reg_p = (Bit8u *) (&vm->guest.addr.guest_context->eax - reg);
*reg_p = val;
}
else {
/* AH,CH,DH,BH */
reg_p = (Bit8u *) (&vm->guest.addr.guest_context->eax - (reg-4));
reg_p++;
*reg_p = val;
}
}
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