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/*
* plex86: run multiple x86 operating systems concurrently
* Copyright (C) 1999-2001 Kevin P. Lawton
*
* ctrl_xfer8.c: emulation of 8-bit control 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
LOOPNE_Jb(vm_t *vm)
{
Bit32u count, new_EIP;
if (vm->i.as_32)
count = G_ECX(vm);
else
count = G_CX(vm);
count--;
if ( (count != 0) && (G_GetZF(vm)==0) ) {
new_EIP = G_EIP(vm) + (Bit32s) vm->i.Id;
if (vm->i.os_32==0)
new_EIP &= 0x0000ffff;
if (ProtectedMode(vm)) {
cache_sreg(vm, SRegCS);
if (new_EIP > vm->guest_cpu.desc_cache[SRegCS].limit_scaled) {
monpanic(vm, "loopne_jb: offset outside of CS limits\n");
exception(vm, ExceptionGP, 0);
}
}
G_EIP(vm) = new_EIP;
revalidate_prefetch_q();
}
if (vm->i.as_32)
G_ECX(vm)--;
else
G_CX(vm)--;
}
void
LOOPE_Jb(vm_t *vm)
{
Bit32u count, new_EIP;
if (vm->i.as_32)
count = G_ECX(vm);
else
count = G_CX(vm);
count--;
if ( (count != 0) && G_GetZF(vm) ) {
new_EIP = G_EIP(vm) + (Bit32s) vm->i.Id;
if (vm->i.os_32==0)
new_EIP &= 0x0000ffff;
if (ProtectedMode(vm)) {
cache_sreg(vm, SRegCS);
if (new_EIP > vm->guest_cpu.desc_cache[SRegCS].limit_scaled) {
monpanic(vm, "loope_jb: offset outside of CS limits\n");
exception(vm, ExceptionGP, 0);
}
}
G_EIP(vm) = new_EIP;
revalidate_prefetch_q();
}
if (vm->i.as_32)
G_ECX(vm)--;
else
G_CX(vm)--;
}
void
LOOP_Jb(vm_t *vm)
{
Bit32u count, new_EIP;
if (vm->i.as_32)
count = G_ECX(vm);
else
count = G_CX(vm);
count--;
if (count != 0) {
new_EIP = G_EIP(vm) + (Bit32s) vm->i.Id;
if (vm->i.os_32==0)
new_EIP &= 0x0000ffff;
if (ProtectedMode(vm)) {
cache_sreg(vm, SRegCS);
if (new_EIP > vm->guest_cpu.desc_cache[SRegCS].limit_scaled) {
monpanic(vm, "loop_jb: offset outside of CS limits\n");
exception(vm, ExceptionGP, 0);
}
}
G_EIP(vm) = new_EIP;
revalidate_prefetch_q();
}
if (vm->i.as_32)
G_ECX(vm)--;
else
G_CX(vm)--;
}
void
JCXZ_Jb(vm_t *vm)
{
Bit32u temp_ECX;
if (vm->i.as_32)
temp_ECX = G_ECX(vm);
else
temp_ECX = G_CX(vm);
if ( temp_ECX == 0 ) {
Bit32u new_EIP;
new_EIP = G_EIP(vm) + (Bit32s) vm->i.Id;
if (vm->i.os_32==0)
new_EIP &= 0x0000ffff;
if (ProtectedMode(vm)) {
cache_sreg(vm, SRegCS);
if (new_EIP > vm->guest_cpu.desc_cache[SRegCS].limit_scaled) {
monpanic(vm, "jcxz_jb: offset outside of CS limits\n");
exception(vm, ExceptionGP, 0);
}
}
G_EIP(vm) = new_EIP;
revalidate_prefetch_q();
}
}
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