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/* $Id: extable.c,v 1.1.1.1 2004-04-15 01:17:15 phoenix Exp $

 *

 * linux/arch/sh/mm/extable.c

 *  Taken from:

 *   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

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;

}

unsigned long

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;

        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) return ret;

        }

#endif

        return 0;

}