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Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/module.h> |
2 | #include <linux/spinlock.h> | |
3 | ||
4 | static LIST_HEAD(dbe_list); | |
5 | static DEFINE_SPINLOCK(dbe_lock); | |
6 | ||
7 | /* Given an address, look for it in the module exception tables. */ | |
8 | const struct exception_table_entry *search_module_dbetables(unsigned long addr) | |
9 | { | |
10 | unsigned long flags; | |
11 | const struct exception_table_entry *e = NULL; | |
12 | struct mod_arch_specific *dbe; | |
13 | ||
14 | spin_lock_irqsave(&dbe_lock, flags); | |
15 | list_for_each_entry(dbe, &dbe_list, dbe_list) { | |
16 | e = search_extable(dbe->dbe_start, dbe->dbe_end - 1, addr); | |
17 | if (e) | |
18 | break; | |
19 | } | |
20 | spin_unlock_irqrestore(&dbe_lock, flags); | |
21 | ||
22 | /* Now, if we found one, we are running inside it now, hence | |
23 | we cannot unload the module, hence no refcnt needed. */ | |
24 | return e; | |
25 | } | |
26 | ||
27 | /* Put in dbe list if neccessary. */ | |
28 | int module_finalize(const Elf_Ehdr *hdr, | |
29 | const Elf_Shdr *sechdrs, | |
30 | struct module *me) | |
31 | { | |
32 | const Elf_Shdr *s; | |
33 | char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
34 | ||
35 | INIT_LIST_HEAD(&me->arch.dbe_list); | |
36 | for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { | |
37 | if (strcmp("__dbe_table", secstrings + s->sh_name) != 0) | |
38 | continue; | |
39 | me->arch.dbe_start = (void *)s->sh_addr; | |
40 | me->arch.dbe_end = (void *)s->sh_addr + s->sh_size; | |
41 | spin_lock_irq(&dbe_lock); | |
42 | list_add(&me->arch.dbe_list, &dbe_list); | |
43 | spin_unlock_irq(&dbe_lock); | |
44 | } | |
45 | return 0; | |
46 | } | |
47 | ||
48 | void module_arch_cleanup(struct module *mod) | |
49 | { | |
50 | spin_lock_irq(&dbe_lock); | |
51 | list_del(&mod->arch.dbe_list); | |
52 | spin_unlock_irq(&dbe_lock); | |
53 | } |