| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/sh/mm/fault-nommu.c |
| 3 | * |
| 4 | * Copyright (C) 2002 Paul Mundt |
| 5 | * |
| 6 | * Based on linux/arch/sh/mm/fault.c: |
| 7 | * Copyright (C) 1999 Niibe Yutaka |
| 8 | * |
| 9 | * Released under the terms of the GNU GPL v2.0. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/signal.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/ptrace.h> |
| 19 | #include <linux/mman.h> |
| 20 | #include <linux/mm.h> |
| 21 | #include <linux/smp.h> |
| 22 | #include <linux/smp_lock.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | |
| 25 | #include <asm/system.h> |
| 26 | #include <asm/io.h> |
| 27 | #include <asm/uaccess.h> |
| 28 | #include <asm/pgalloc.h> |
| 29 | #include <asm/mmu_context.h> |
| 30 | #include <asm/cacheflush.h> |
| 31 | |
| 32 | #if defined(CONFIG_SH_KGDB) |
| 33 | #include <asm/kgdb.h> |
| 34 | #endif |
| 35 | |
| 36 | extern void die(const char *,struct pt_regs *,long); |
| 37 | |
| 38 | /* |
| 39 | * This routine handles page faults. It determines the address, |
| 40 | * and the problem, and then passes it off to one of the appropriate |
| 41 | * routines. |
| 42 | */ |
| 43 | asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess, |
| 44 | unsigned long address) |
| 45 | { |
| 46 | #if defined(CONFIG_SH_KGDB) |
| 47 | if (kgdb_nofault && kgdb_bus_err_hook) |
| 48 | kgdb_bus_err_hook(); |
| 49 | #endif |
| 50 | |
| 51 | /* |
| 52 | * Oops. The kernel tried to access some bad page. We'll have to |
| 53 | * terminate things with extreme prejudice. |
| 54 | * |
| 55 | */ |
| 56 | if (address < PAGE_SIZE) { |
| 57 | printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference"); |
| 58 | } else { |
| 59 | printk(KERN_ALERT "Unable to handle kernel paging request"); |
| 60 | } |
| 61 | |
| 62 | printk(" at virtual address %08lx\n", address); |
| 63 | printk(KERN_ALERT "pc = %08lx\n", regs->pc); |
| 64 | |
| 65 | die("Oops", regs, writeaccess); |
| 66 | do_exit(SIGKILL); |
| 67 | } |
| 68 | |
| 69 | asmlinkage int __do_page_fault(struct pt_regs *regs, unsigned long writeaccess, |
| 70 | unsigned long address) |
| 71 | { |
| 72 | #if defined(CONFIG_SH_KGDB) |
| 73 | if (kgdb_nofault && kgdb_bus_err_hook) |
| 74 | kgdb_bus_err_hook(); |
| 75 | #endif |
| 76 | |
| 77 | if (address >= TASK_SIZE) |
| 78 | return 1; |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |