extable.c
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上传日期:2013-04-10
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文件大小:2k
- /*
- * 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
- }