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 */
do_page_fault(struct pt_regs * regs,unsigned long address,unsigned long error_code)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
58