arch/mips/kernel/module.c

   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 }