blob: af21d4ad17991f320316280759d320b4754417c7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/* $Id: extable.c,v 1.2 1999/11/23 17:12:50 ralf Exp $
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994, 1995, 1996, 1999 by Ralf Baechle
* Copyright (C) 1999 by Silicon Graphics
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
extern const struct exception_table_entry __start___ex_table[];
extern const struct exception_table_entry __stop___ex_table[];
static inline unsigned long
search_one_table(const struct exception_table_entry *first,
const struct exception_table_entry *last,
unsigned long value)
{
while (first <= last) {
const struct exception_table_entry *mid;
long diff;
mid = (last - first) / 2 + first;
diff = mid->insn - value;
if (diff == 0)
return mid->nextinsn;
else if (diff < 0)
first = mid+1;
else
last = mid-1;
}
return 0;
}
extern spinlock_t modlist_lock;
unsigned long
search_exception_table(unsigned long addr)
{
unsigned long ret = 0;
unsigned long flags;
#ifndef CONFIG_MODULES
/* There is only the kernel to search. */
ret = search_one_table(__start___ex_table, __stop___ex_table-1, addr);
return ret;
#else
/* The kernel is the last "module" -- no need to treat it special. */
struct module *mp;
spin_lock_irqsave(&modlist_lock, flags);
for (mp = module_list; mp != NULL; mp = mp->next) {
if (mp->ex_table_start == NULL)
continue;
ret = search_one_table(mp->ex_table_start,
mp->ex_table_end - 1, addr);
if (ret)
break;
}
spin_unlock_irqrestore(&modlist_lock, flags);
return ret;
#endif
}
|
