| /* |
| * arch/s390/mm/extable.c |
| * |
| * S390 version |
| * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| * Author(s): Hartmut Penner (hp@de.ibm.com) |
| * |
| * Derived from "arch/i386/mm/extable.c" |
| */ |
| |
| #include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/spinlock.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 |
| search_one_table(const struct exception_table_entry *first, |
| const struct exception_table_entry *last, |
| unsigned long value) |
| { |
| while (first <= last) { |
| const struct exception_table_entry *mid; |
| long diff; |
| |
| mid = (last - first) / 2 + first; |
| diff = mid->insn - value; |
| if (diff == 0) |
| return mid->fixup; |
| else if (diff < 0) |
| first = mid+1; |
| else |
| last = mid-1; |
| } |
| return 0; |
| } |
| |
| extern spinlock_t modlist_lock; |
| |
| unsigned long |
| search_exception_table(unsigned long addr) |
| { |
| unsigned long ret = 0; |
| unsigned long flags; |
| |
| #ifndef CONFIG_MODULES |
| /* There is only the kernel to search. */ |
| ret = search_one_table(__start___ex_table, __stop___ex_table-1, addr); |
| return ret; |
| #else |
| /* The kernel is the last "module" -- no need to treat it special. */ |
| struct module *mp; |
| |
| spin_lock_irqsave(&modlist_lock, flags); |
| for (mp = module_list; mp != NULL; mp = mp->next) { |
| if (mp->ex_table_start == NULL || !(mp->flags&(MOD_RUNNING|MOD_INITIALIZING))) |
| continue; |
| ret = search_one_table(mp->ex_table_start, |
| mp->ex_table_end - 1, addr); |
| if (ret) |
| break; |
| } |
| spin_unlock_irqrestore(&modlist_lock, flags); |
| return ret; |
| #endif |
| } |