arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / sparc / mm / extable.c
blob241b4064187333f04998fa3aaa1d3352608cdabd
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/sparc/mm/extable.c
4 */
6 #include <linux/module.h>
7 #include <linux/extable.h>
8 #include <linux/uaccess.h>
10 void sort_extable(struct exception_table_entry *start,
11 struct exception_table_entry *finish)
15 /* Caller knows they are in a range if ret->fixup == 0 */
16 const struct exception_table_entry *
17 search_extable(const struct exception_table_entry *base,
18 const size_t num,
19 unsigned long value)
21 int i;
23 /* Single insn entries are encoded as:
24 * word 1: insn address
25 * word 2: fixup code address
27 * Range entries are encoded as:
28 * word 1: first insn address
29 * word 2: 0
30 * word 3: last insn address + 4 bytes
31 * word 4: fixup code address
33 * Deleted entries are encoded as:
34 * word 1: unused
35 * word 2: -1
37 * See asm/uaccess.h for more details.
40 /* 1. Try to find an exact match. */
41 for (i = 0; i < num; i++) {
42 if (base[i].fixup == 0) {
43 /* A range entry, skip both parts. */
44 i++;
45 continue;
48 /* A deleted entry; see trim_init_extable */
49 if (base[i].fixup == -1)
50 continue;
52 if (base[i].insn == value)
53 return &base[i];
56 /* 2. Try to find a range match. */
57 for (i = 0; i < (num - 1); i++) {
58 if (base[i].fixup)
59 continue;
61 if (base[i].insn <= value && base[i + 1].insn > value)
62 return &base[i];
64 i++;
67 return NULL;
70 #ifdef CONFIG_MODULES
71 /* We could memmove them around; easier to mark the trimmed ones. */
72 void trim_init_extable(struct module *m)
74 unsigned int i;
75 bool range;
77 for (i = 0; i < m->num_exentries; i += range ? 2 : 1) {
78 range = m->extable[i].fixup == 0;
80 if (within_module_init(m->extable[i].insn, m)) {
81 m->extable[i].fixup = -1;
82 if (range)
83 m->extable[i+1].fixup = -1;
85 if (range)
86 i++;
89 #endif /* CONFIG_MODULES */
91 /* Special extable search, which handles ranges. Returns fixup */
92 unsigned long search_extables_range(unsigned long addr, unsigned long *g2)
94 const struct exception_table_entry *entry;
96 entry = search_exception_tables(addr);
97 if (!entry)
98 return 0;
100 /* Inside range? Fix g2 and return correct fixup */
101 if (!entry->fixup) {
102 *g2 = (addr - entry->insn) / 4;
103 return (entry + 1)->fixup;
106 return entry->fixup;