Bochs/bochs/cpu/ctrl_xfer8.cc

//  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--;
}