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12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/sort.h>
15#include <asm/uaccess.h>
16
17#ifndef ARCH_HAS_SORT_EXTABLE
18
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21
22
23
24static int cmp_ex(const void *a, const void *b)
25{
26 const struct exception_table_entry *x = a, *y = b;
27
28
29 if (x->insn > y->insn)
30 return 1;
31 if (x->insn < y->insn)
32 return -1;
33 return 0;
34}
35
36void sort_extable(struct exception_table_entry *start,
37 struct exception_table_entry *finish)
38{
39 sort(start, finish - start, sizeof(struct exception_table_entry),
40 cmp_ex, NULL);
41}
42
43#ifdef CONFIG_MODULES
44
45
46
47
48void trim_init_extable(struct module *m)
49{
50
51 while (m->num_exentries && within_module_init(m->extable[0].insn, m)) {
52 m->extable++;
53 m->num_exentries--;
54 }
55
56 while (m->num_exentries &&
57 within_module_init(m->extable[m->num_exentries-1].insn, m))
58 m->num_exentries--;
59}
60#endif
61#endif
62
63#ifndef ARCH_HAS_SEARCH_EXTABLE
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70
71const struct exception_table_entry *
72search_extable(const struct exception_table_entry *first,
73 const struct exception_table_entry *last,
74 unsigned long value)
75{
76 while (first <= last) {
77 const struct exception_table_entry *mid;
78
79 mid = ((last - first) >> 1) + first;
80
81
82
83
84 if (mid->insn < value)
85 first = mid + 1;
86 else if (mid->insn > value)
87 last = mid - 1;
88 else
89 return mid;
90 }
91 return NULL;
92}
93#endif
94