ssfault.cxx

C++ 编写的EROS RTOS

/*
 * Copyright (C) 1998, 1999, Jonathan S. Shapiro.
 *
 * This file is part of the EROS Operating System.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2,
 * or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/* Drivers for 386 protection faults */

#include <eros/target.h>
#include <kerninc/kernel.hxx>
#include <kerninc/Thread.hxx>
#include <kerninc/Debug.hxx>
#include <kerninc/Machine.hxx>
#include <kerninc/util.h>
#include <kerninc/Process.hxx>
#include "IDT.hxx"

bool
SSFault(fixregs_t* sa)
{
  if ( sa_IsKernel(sa) ) {
    Debug::Backtrace();
    halt('s');
  }

  /* If the stack segment fault is on a domain marked as a small space
   * domain, upgrade the domain to a large space domain and let it
   * retry the reference before concluding that we should take this
   * fault seriously.
   */
#ifdef OPTION_SMALL_SPACES
  if (Thread::CurContext()->smallPTE) {
#if 0
    dprintf(true, "Small Space domain takes SS fault\n");
#endif
    Thread::CurContext()->SwitchToLargeSpace();
    return false;
  }
#endif
  
  /* Should this have a dedicated error code? */
  ((Process*) Thread::CurContext())->SetFault(FC_StackSeg, sa->EIP, false);

  return false;
}