/* * linux/arch/i386/mm/extable.c */ #include <linux/config.h> #include <linux/module.h> #include <asm/uaccess.h> extern const struct exception_table_entry __start___ex_table[]; extern const struct exception_table_entry __stop___ex_table[]; static inline unsigned long 13 search_one_table(const struct exception_table_entry *first, const struct exception_table_entry *last, unsigned long value) { 17 while (first <= last) { const struct exception_table_entry *mid; long diff; mid = (last - first) / 2 + first; diff = mid->insn - value; 23 if (diff == 0) 24 return mid->fixup; 25 else if (diff < 0) first = mid+1; 27 else last = mid-1; } 30 return 0; } unsigned long 34 search_exception_table(unsigned long addr) { unsigned long ret; #ifndef CONFIG_MODULES /* There is only the kernel to search. */ ret = search_one_table(__start___ex_table, __stop___ex_table-1, addr); if (ret) return ret; #else /* The kernel is the last "module" -- no need to treat it special. */ struct module *mp; 45 for (mp = module_list; mp != NULL; mp = mp->next) { 46 if (mp->ex_table_start == NULL) 47 continue; ret = search_one_table(mp->ex_table_start, mp->ex_table_end - 1, addr); 50 if (ret) return ret; } #endif 54 return 0; }