View of xos/tests/stack.c

/* Copyright (C) 2008  Emmanuel Varoquaux
 
   This file is part of XOS.
 
   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 3 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, see <http://www.gnu.org/licenses/>. */
 
#include <stdio.h>
 
int main()
{
  char t[4096];
  unsigned long esp;
 
  printf("1\n");
  *t = 0;
 
  asm volatile ("movl %%esp, %0" : "=r" (esp));
 
  printf("2\n");
  *((int *)(esp - (65536 + 32 * sizeof (unsigned long)))) = 0; /* tolere */
 
  printf("3\n");
  *((int *)(esp - (65536 + 32 * sizeof (unsigned long)) - 4096)) = 0; /* SEGV */
 
  printf("4\n");
  return 0;
}