2 * Derived from arch/ppc/mm/extable.c and arch/i386/mm/extable.c.
4 * Copyright (C) 2004 Paul Mackerras, IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/sort.h>
15 #include <asm/uaccess.h>
17 #ifndef ARCH_HAS_SORT_EXTABLE
19 * The exception table needs to be sorted so that the binary
20 * search that we use to find entries in it works properly.
21 * This is used both for the kernel exception table and for
22 * the exception tables of modules that get loaded.
24 static int cmp_ex(const void *a
, const void *b
)
26 const struct exception_table_entry
*x
= a
, *y
= b
;
29 if (x
->insn
> y
->insn
)
31 if (x
->insn
< y
->insn
)
36 void sort_extable(struct exception_table_entry
*start
,
37 struct exception_table_entry
*finish
)
39 sort(start
, finish
- start
, sizeof(struct exception_table_entry
),
44 #ifndef ARCH_HAS_SEARCH_EXTABLE
46 * Search one exception table for an entry corresponding to the
47 * given instruction address, and return the address of the entry,
48 * or NULL if none is found.
49 * We use a binary search, and thus we assume that the table is
52 const struct exception_table_entry
*
53 search_extable(const struct exception_table_entry
*first
,
54 const struct exception_table_entry
*last
,
57 while (first
<= last
) {
58 const struct exception_table_entry
*mid
;
60 mid
= ((last
- first
) >> 1) + first
;
62 * careful, the distance between value and insn
63 * can be larger than MAX_LONG:
65 if (mid
->insn
< value
)
67 else if (mid
->insn
> value
)
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