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/////////////////////////////////////////////////////////////////////////
// $Id: ctrl_xfer8.cc,v 1.6 2001/10/03 13:10:37 bdenney Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
//
// MandrakeSoft S.A.
// 43, rue d'Aboukir
// 75002 Paris - France
// http://www.linux-mandrake.com/
// http://www.mandrakesoft.com/
//
// 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
#define NEED_CPU_REG_SHORTCUTS 1
#include "bochs.h"
#define LOG_THIS BX_CPU_THIS_PTR
void
BX_CPU_C::JCXZ_Jb(BxInstruction_t *i)
{
Bit32u temp_ECX;
if (i->as_32)
temp_ECX = ECX;
else
temp_ECX = CX;
if ( temp_ECX == 0 ) {
Bit32u new_EIP;
new_EIP = EIP + (Bit32s) i->Id;
if (i->os_32==0)
new_EIP &= 0x0000ffff;
#if BX_CPU_LEVEL >= 2
if (protected_mode()) {
if ( new_EIP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled ) {
BX_PANIC(("jcxz_jb: offset outside of CS limits"));
exception(BX_GP_EXCEPTION, 0, 0);
}
}
#endif
EIP = new_EIP;
BX_INSTR_CNEAR_BRANCH_TAKEN(new_EIP);
revalidate_prefetch_q();
}
#if BX_INSTRUMENTATION
else {
BX_INSTR_CNEAR_BRANCH_NOT_TAKEN();
}
#endif
}
void
BX_CPU_C::LOOPNE_Jb(BxInstruction_t *i)
{
Bit32u count, new_EIP;
#if BX_CPU_LEVEL >= 3
if (i->as_32)
count = ECX;
else
#endif /* BX_CPU_LEVEL >= 3 */
count = CX;
count--;
if ( (count!=0) && (get_ZF()==0) ) {
new_EIP = EIP + (Bit32s) i->Id;
if (i->os_32==0)
new_EIP &= 0x0000ffff;
if (protected_mode()) {
if (new_EIP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled) {
BX_PANIC(("loopne_jb: offset outside of CS limits"));
exception(BX_GP_EXCEPTION, 0, 0);
}
}
BX_CPU_THIS_PTR eip = new_EIP;
BX_INSTR_CNEAR_BRANCH_TAKEN(new_EIP);
revalidate_prefetch_q();
}
#if BX_INSTRUMENTATION
else {
BX_INSTR_CNEAR_BRANCH_NOT_TAKEN();
}
#endif
if (i->as_32)
ECX--;
else
CX--;
}
void
BX_CPU_C::LOOPE_Jb(BxInstruction_t *i)
{
Bit32u count, new_EIP;
#if BX_CPU_LEVEL >= 3
if (i->as_32)
count = ECX;
else
#endif /* BX_CPU_LEVEL >= 3 */
count = CX;
count--;
if ( (count!=0) && get_ZF()) {
new_EIP = EIP + (Bit32s) i->Id;
if (i->os_32==0)
new_EIP &= 0x0000ffff;
if (protected_mode()) {
if (new_EIP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled) {
BX_PANIC(("loope_jb: offset outside of CS limits"));
exception(BX_GP_EXCEPTION, 0, 0);
}
}
BX_CPU_THIS_PTR eip = new_EIP;
BX_INSTR_CNEAR_BRANCH_TAKEN(new_EIP);
revalidate_prefetch_q();
}
#if BX_INSTRUMENTATION
else {
BX_INSTR_CNEAR_BRANCH_NOT_TAKEN();
}
#endif
if (i->as_32)
ECX--;
else
CX--;
}
void
BX_CPU_C::LOOP_Jb(BxInstruction_t *i)
{
Bit32u count, new_EIP;
#if BX_CPU_LEVEL >= 3
if (i->as_32)
count = ECX;
else
#endif /* BX_CPU_LEVEL >= 3 */
count = CX;
count--;
if (count != 0) {
new_EIP = EIP + (Bit32s) i->Id;
if (i->os_32==0)
new_EIP &= 0x0000ffff;
if (protected_mode()) {
if (new_EIP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled) {
BX_PANIC(("loop_jb: offset outside of CS limits"));
exception(BX_GP_EXCEPTION, 0, 0);
}
}
BX_CPU_THIS_PTR eip = new_EIP;
BX_INSTR_CNEAR_BRANCH_TAKEN(new_EIP);
revalidate_prefetch_q();
}
#if BX_INSTRUMENTATION
else {
BX_INSTR_CNEAR_BRANCH_NOT_TAKEN();
}
#endif
if (i->as_32)
ECX--;
else
CX--;
}
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