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
  23 void 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  */
  36 asmlinkage 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 }