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  */
  34 asmlinkage 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