arch/sh/mm/extable.c

   1 /*
   2  * linux/arch/sh/mm/extable.c
   3  *  Taken from:
   4  *   linux/arch/i386/mm/extable.c
   5  */
   6
   7 #include <linux/config.h>
   8 #include <linux/module.h>
   9 #include <asm/uaccess.h>
  10
  11 extern const struct exception_table_entry __start___ex_table[];
  12 extern const struct exception_table_entry __stop___ex_table[];
  13
  14 static inline unsigned long
  15 search_one_table(const struct exception_table_entry *first,
  16                  const struct exception_table_entry *last,
  17                  unsigned long value)
  18 {
  19         while (first <= last) {
  20                 const struct exception_table_entry *mid;
  21                 long diff;
  22
  23                 mid = (last - first) / 2 + first;
  24                 diff = mid->insn - value;
  25                 if (diff == 0)
  26                         return mid->fixup;
  27                 else if (diff < 0)
  28                         first = mid+1;
  29                 else
  30                         last = mid-1;
  31         }
  32         return 0;
  33 }
  34
  35 unsigned long
  36 search_exception_table(unsigned long addr)
  37 {
  38         unsigned long ret;
  39
  40 #ifndef CONFIG_MODULES
  41         /* There is only the kernel to search.  */
  42         ret = search_one_table(__start___ex_table, __stop___ex_table-1, addr);
  43         if (ret) return ret;
  44 #else
  45         /* The kernel is the last "module" -- no need to treat it special.  */
  46         struct module *mp;
  47         for (mp = module_list; mp != NULL; mp = mp->next) {
  48                 if (mp->ex_table_start == NULL)
  49                         continue;
  50                 ret = search_one_table(mp->ex_table_start,
  51                                        mp->ex_table_end - 1, addr);
  52                 if (ret) return ret;
  53         }
  54 #endif
  55
  56         return 0;
  57 }