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