blob: 6f6673cb58290c31d1bc215e0e312a70d88a3f8f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/m68knommu/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/m68k/mm/fault.c
10 *
11 * Copyright (C) 1995 Hamish Macdonald
12 */
13
14#include <linux/mman.h>
15#include <linux/mm.h>
16#include <linux/kernel.h>
17#include <linux/ptrace.h>
18
19#include <asm/system.h>
20#include <asm/pgtable.h>
21
22extern void die_if_kernel(char *, struct pt_regs *, long);
23
24/*
25 * This routine handles page faults. It determines the problem, and
26 * then passes it off to one of the appropriate routines.
27 *
28 * error_code:
29 * bit 0 == 0 means no page found, 1 means protection fault
30 * bit 1 == 0 means read, 1 means write
31 *
32 * If this routine detects a bad access, it returns 1, otherwise it
33 * returns 0.
34 */
35asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
36 unsigned long error_code)
37{
38#ifdef DEBUG
39 printk (KERN_DEBUG "regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n",
40 regs->sr, regs->pc, address, error_code);
41#endif
42
43 /*
44 * Oops. The kernel tried to access some bad page. We'll have to
45 * terminate things with extreme prejudice.
46 */
47 if ((unsigned long) address < PAGE_SIZE) {
48 printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
49 } else
50 printk(KERN_ALERT "Unable to handle kernel access");
51 printk(KERN_ALERT " at virtual address %08lx\n",address);
52 die_if_kernel("Oops", regs, error_code);
53 do_exit(SIGKILL);
54
55 return 1;
56}
57