myprog4.c

Simple Operating Systems （简称SOS）是一个可以运行在X86平台上（包括QEMU

/* Copyright (C) 2005 David Decotigny

   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
   of the License, 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, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA. 
*/

#include <debug.h>

/**
 * @file myprog4.c
 * Test unresolved page fault (write to unmapped page in user space)
 */

int main()
{
  char *c;
  int i;
  bochs_printf("Prog4: Hello world A !\n");
  for (i = 0 ; i < 100000 ; i++)
    continue;
  bochs_printf("Prog4: Hello world B !\n");

  /* Force a page fault */
  c = (char*) 0x60000000;
  /* Try to read somewhere in user space where nothing is mapped */
  i = *c;

  bochs_printf("Prog4: Hello world C !\n");
  for ( ; i> 0 ; i--)
    continue;
  bochs_printf("Prog4: Hello world D !\n");

  return 0;
}