blob: 5924ff555ded40ed7d4e1919bdf744e7cfe90083 [file] [log] [blame]
Yoshinori Satobbeb79a2015-01-28 02:47:36 +09001/*
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
22void die(const char *str, struct pt_regs *fp, unsigned long err);
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 pr_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 pr_alert("Unable to handle kernel NULL pointer dereference");
49 else
50 pr_alert("Unable to handle kernel access");
51 printk(" at virtual address %08lx\n", address);
52 if (!user_mode(regs))
53 die("Oops", regs, error_code);
54 do_exit(SIGKILL);
55
56 return 1;
57}