LXR linux/arch/h8300/mm/fault.c

   1/*
   2 *  linux/arch/h8300/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/m68knommu/mm/fault.c
  10 *  linux/arch/m68k/mm/fault.c
  11 *
  12 *  Copyright (C) 1995  Hamish Macdonald
  13 */
  14
  15#include <linux/mman.h>
  16#include <linux/mm.h>
  17#include <linux/kernel.h>
  18#include <linux/ptrace.h>
  19
  20#include <asm/system.h>
  21#include <asm/pgtable.h>
  22
  23/*
  24 * This routine handles page faults.  It determines the problem, and
  25 * then passes it off to one of the appropriate routines.
  26 *
  27 * error_code:
  28 *      bit 0 == 0 means no page found, 1 means protection fault
  29 *      bit 1 == 0 means read, 1 means write
  30 *
  31 * If this routine detects a bad access, it returns 1, otherwise it
  32 * returns 0.
  33 */
  34asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
  35                              unsigned long error_code)
  36{
  37#ifdef DEBUG
  38        printk ("regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n",
  39                regs->sr, regs->pc, address, error_code);
  40#endif
  41
  42/*
  43 * Oops. The kernel tried to access some bad page. We'll have to
  44 * terminate things with extreme prejudice.
  45 */
  46        if ((unsigned long) address < PAGE_SIZE) {
  47                printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
  48        } else
  49                printk(KERN_ALERT "Unable to handle kernel access");
  50        printk(" at virtual address %08lx\n",address);
  51        if (!user_mode(regs))
  52                die("Oops", regs, error_code);
  53        do_exit(SIGKILL);
  54
  55        return 1;
  56}
  57
  58