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1 | /* |
2 | * linux/arch/sparc/mm/extable.c |
3 | */ |
4 | |
5 | #include <linux/module.h> |
6 | #include <asm/uaccess.h> |
7 | |
8 | void sort_extable(struct exception_table_entry *start, |
9 | struct exception_table_entry *finish) |
10 | { |
11 | } |
12 | |
13 | /* Caller knows they are in a range if ret->fixup == 0 */ |
14 | const struct exception_table_entry * |
15 | search_extable(const struct exception_table_entry *start, |
16 | const struct exception_table_entry *last, |
17 | unsigned long value) |
18 | { |
19 | const struct exception_table_entry *walk; |
20 | |
21 | /* Single insn entries are encoded as: |
22 | * word 1: insn address |
23 | * word 2: fixup code address |
24 | * |
25 | * Range entries are encoded as: |
26 | * word 1: first insn address |
27 | * word 2: 0 |
28 | * word 3: last insn address + 4 bytes |
29 | * word 4: fixup code address |
30 | * |
31 | * Deleted entries are encoded as: |
32 | * word 1: unused |
33 | * word 2: -1 |
34 | * |
35 | * See asm/uaccess.h for more details. |
36 | */ |
37 | |
38 | /* 1. Try to find an exact match. */ |
39 | for (walk = start; walk <= last; walk++) { |
40 | if (walk->fixup == 0) { |
41 | /* A range entry, skip both parts. */ |
42 | walk++; |
43 | continue; |
44 | } |
45 | |
46 | /* A deleted entry; see trim_init_extable */ |
47 | if (walk->fixup == -1) |
48 | continue; |
49 | |
50 | if (walk->insn == value) |
51 | return walk; |
52 | } |
53 | |
54 | /* 2. Try to find a range match. */ |
55 | for (walk = start; walk <= (last - 1); walk++) { |
56 | if (walk->fixup) |
57 | continue; |
58 | |
59 | if (walk[0].insn <= value && walk[1].insn > value) |
60 | return walk; |
61 | |
62 | walk++; |
63 | } |
64 | |
65 | return NULL; |
66 | } |
67 | |
68 | #ifdef CONFIG_MODULES |
69 | /* We could memmove them around; easier to mark the trimmed ones. */ |
70 | void trim_init_extable(struct module *m) |
71 | { |
72 | unsigned int i; |
73 | bool range; |
74 | |
75 | for (i = 0; i < m->num_exentries; i += range ? 2 : 1) { |
76 | range = m->extable[i].fixup == 0; |
77 | |
78 | if (within_module_init(m->extable[i].insn, m)) { |
79 | m->extable[i].fixup = -1; |
80 | if (range) |
81 | m->extable[i+1].fixup = -1; |
82 | } |
83 | if (range) |
84 | i++; |
85 | } |
86 | } |
87 | #endif /* CONFIG_MODULES */ |
88 | |
89 | /* Special extable search, which handles ranges. Returns fixup */ |
90 | unsigned long search_extables_range(unsigned long addr, unsigned long *g2) |
91 | { |
92 | const struct exception_table_entry *entry; |
93 | |
94 | entry = search_exception_tables(addr); |
95 | if (!entry) |
96 | return 0; |
97 | |
98 | /* Inside range? Fix g2 and return correct fixup */ |
99 | if (!entry->fixup) { |
100 | *g2 = (addr - entry->insn) / 4; |
101 | return (entry + 1)->fixup; |
102 | } |
103 | |
104 | return entry->fixup; |
105 | } |
106 |
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