tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
36extern 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 */
43asmlinkage 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
69asmlinkage 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