arch/m68knommu/mm/fault.c

   1 /*
   2  *  linux/arch/m68knommu/mm/fault.c
   3  *
   4  *  Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>,
   5  *  Copyright (C) 2000  Lineo, Inc.  (www.lineo.com)
   6  *
   7  *  Based on:
   8  *
   9  *  linux/arch/m68k/mm/fault.c
  10  *
  11  *  Copyright (C) 1995  Hamish Macdonald
  12  */
  13
  14 #include <linux/mman.h>
  15 #include <linux/mm.h>
  16 #include <linux/kernel.h>
  17 #include <linux/ptrace.h>
  18
  19 #include <asm/system.h>
  20 #include <asm/pgtable.h>
  21
  22 extern void die_if_kernel(char *, struct pt_regs *, long);
  23
  24 /*
  25  * This routine handles page faults.  It determines the problem, and
  26  * then passes it off to one of the appropriate routines.
  27  *
  28  * error_code:
  29  *      bit 0 == 0 means no page found, 1 means protection fault
  30  *      bit 1 == 0 means read, 1 means write
  31  *
  32  * If this routine detects a bad access, it returns 1, otherwise it
  33  * returns 0.
  34  */
  35 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
  36                               unsigned long error_code)
  37 {
  38 #ifdef DEBUG
  39         printk(KERN_DEBUG "regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n",
  40                 regs->sr, regs->pc, address, error_code);
  41 #endif
  42
  43         /*
  44          * Oops. The kernel tried to access some bad page. We'll have to
  45          * terminate things with extreme prejudice.
  46          */
  47         if ((unsigned long) address < PAGE_SIZE)
  48                 printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
  49         else
  50                 printk(KERN_ALERT "Unable to handle kernel access");
  51         printk(KERN_ALERT " at virtual address %08lx\n", address);
  52         die_if_kernel("Oops", regs, error_code);
  53         do_exit(SIGKILL);
  54
  55         return 1;
  56 }
  57