/* *  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 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->fixup;                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;	unsigned long flags;#ifndef CONFIG_MODULES        addr &= 0x7fffffff;  /* remove amode bit from address */	/* There is only the kernel to search.  */	ret = search_one_table(__start___ex_table, __stop___ex_table-1, addr);	if (ret) ret = FIX_PSW(ret);	return ret;#else	/* The kernel is the last "module" -- no need to treat it special.  */	struct module *mp;        addr &= 0x7fffffff;  /* remove amode bit from address */	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) {			ret = FIX_PSW(ret);			break;		}	}	spin_unlock_irqrestore(&modlist_lock, flags);	return ret;#endif}