/* * linux/arch/mips/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 longsearch_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->nextinsn;		else if (diff < 0)			first = mid+1;		else			last = mid-1;	}	return 0;}extern spinlock_t modlist_lock;unsigned longsearch_exception_table(unsigned long addr){	unsigned long ret = 0;#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	unsigned long flags;	/* 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}