linux/arch/m68knommu/mm/fault.c
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   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
  22extern 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 */
  35asmlinkage 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
  58