Bochs/bochs/cpu/ctrl_xfer8.cc

/////////////////////////////////////////////////////////////////////////
// $Id: ctrl_xfer8.cc,v 1.9 2002-09-17 22:50:52 kevinlawton 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



#if BX_SUPPORT_X86_64==0
// Make life a little easier for the 64/32-bit merge.
#define RCX ECX
#define RIP EIP
#endif


  void
BX_CPU_C::JCXZ_Jb(bxInstruction_c *i)
{

  if (i->as_64) {
    if ( RCX == 0 ) {
      RIP += (Bit32s) i->Id();
      BX_INSTR_CNEAR_BRANCH_TAKEN(new_RIP);
      revalidate_prefetch_q();
      }
#if BX_INSTRUMENTATION
    else {
      BX_INSTR_CNEAR_BRANCH_NOT_TAKEN();
      }
#endif
    }
  else {
    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_c *i)
{
  if (i->as_64) {

    if ( ((--RCX)!=0) && (get_ZF()==0) ) {

      RIP += (Bit32s) i->Id();
      BX_INSTR_CNEAR_BRANCH_TAKEN(RIP);
      revalidate_prefetch_q();
      }
#if BX_INSTRUMENTATION
    else {
      BX_INSTR_CNEAR_BRANCH_NOT_TAKEN();
      }
#endif
    }
  else {
    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);
          }
        }
      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)
      RCX = ECX - 1;  // zero extend
    else
      CX--;
    }
}

  void
BX_CPU_C::LOOPE_Jb(bxInstruction_c *i)
{
  if (i->as_64) {

    if ( ((--RCX)!=0) && (get_ZF()) ) {

      RIP += (Bit32s) i->Id();
      BX_INSTR_CNEAR_BRANCH_TAKEN(RIP);
      revalidate_prefetch_q();
      }
#if BX_INSTRUMENTATION
    else {
      BX_INSTR_CNEAR_BRANCH_NOT_TAKEN();
      }
#endif
    }
  else {
    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);
          }
        }
      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)
      RCX = ECX - 1;   // zero extend
    else
      CX--;
    }
}

  void
BX_CPU_C::LOOP_Jb(bxInstruction_c *i)
{
  if (i->as_64) {

    if ( ((--RCX)!=0) ) {

      RIP += (Bit32s) i->Id();
      BX_INSTR_CNEAR_BRANCH_TAKEN(RIP);
      revalidate_prefetch_q();
      }
#if BX_INSTRUMENTATION
    else {
      BX_INSTR_CNEAR_BRANCH_NOT_TAKEN();
      }
#endif
    }
  else {
    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);
          }
        }
      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)
      RCX = ECX - 1;         // zero extend
    else
      CX--;
    }
}