2 * linux/arch/sparc64/mm/extable.c
5 #include <linux/config.h>
6 #include <linux/module.h>
7 #include <asm/uaccess.h>
9 extern const struct exception_table_entry __start___ex_table[];
10 extern const struct exception_table_entry __stop___ex_table[];
12 void sort_extable(struct exception_table_entry *start,
13 struct exception_table_entry *finish)
17 /* Caller knows they are in a range if ret->fixup == 0 */
18 const struct exception_table_entry *
19 search_extable(const struct exception_table_entry *start,
20 const struct exception_table_entry *last,
23 const struct exception_table_entry *walk;
25 /* Single insn entries are encoded as:
26 * word 1: insn address
27 * word 2: fixup code address
29 * Range entries are encoded as:
30 * word 1: first insn address
32 * word 3: last insn address + 4 bytes
33 * word 4: fixup code address
35 * See asm/uaccess.h for more details.
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. */
46 if (walk->insn == value)
50 /* 2. Try to find a range match. */
51 for (walk = start; walk <= (last - 1); walk++) {
55 if (walk[0].insn <= value && walk[1].insn > value)
64 /* Special extable search, which handles ranges. Returns fixup */
65 unsigned long search_extables_range(unsigned long addr, unsigned long *g2)
67 const struct exception_table_entry *entry;
69 entry = search_exception_tables(addr);
73 /* Inside range? Fix g2 and return correct fixup */
75 *g2 = (addr - entry->insn) / 4;
76 return (entry + 1)->fixup;