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

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  linux/arch/h8300/mm/fault.c
   4 *
   5 *  Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>,
   6 *  Copyright (C) 2000  Lineo, Inc.  (www.lineo.com)
   7 *
   8 *  Based on:
   9 *
  10 *  linux/arch/m68knommu/mm/fault.c
  11 *  linux/arch/m68k/mm/fault.c
  12 *
  13 *  Copyright (C) 1995  Hamish Macdonald
  14 */
  15
  16#include <linux/mman.h>
  17#include <linux/mm.h>
  18#include <linux/kernel.h>
  19#include <linux/ptrace.h>
  20
  21#include <asm/pgtable.h>
  22
  23void die(const char *str, struct pt_regs *fp, unsigned long err);
  24
  25/*
  26 * This routine handles page faults.  It determines the problem, and
  27 * then passes it off to one of the appropriate routines.
  28 *
  29 * error_code:
  30 *      bit 0 == 0 means no page found, 1 means protection fault
  31 *      bit 1 == 0 means read, 1 means write
  32 *
  33 * If this routine detects a bad access, it returns 1, otherwise it
  34 * returns 0.
  35 */
  36asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
  37                              unsigned long error_code)
  38{
  39#ifdef DEBUG
  40        pr_debug("regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n",
  41                 regs->sr, regs->pc, address, error_code);
  42#endif
  43
  44/*
  45 * Oops. The kernel tried to access some bad page. We'll have to
  46 * terminate things with extreme prejudice.
  47 */
  48        if ((unsigned long) address < PAGE_SIZE)
  49                pr_alert("Unable to handle kernel NULL pointer dereference");
  50        else
  51                pr_alert("Unable to handle kernel access");
  52        printk(" at virtual address %08lx\n", address);
  53        if (!user_mode(regs))
  54                die("Oops", regs, error_code);
  55        do_exit(SIGKILL);
  56
  57        return 1;
  58}
  59