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1da177e4 LT |
1 | /* |
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 | ||
22 | extern 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 | */ | |
35 | asmlinkage 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 |