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[PATCH] frv: support module exception tables

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Fix the exception table handling so that modules exceptions are dealt with.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Howells 2006-01-08 01:01:19 -08:00 committed by Linus Torvalds
parent 402344012e
commit 018b8d12bc
1 changed files with 9 additions and 25 deletions
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34
arch/frv/mm/extable.c
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@ -43,7 +43,7 @@ static inline unsigned long search_one_table(const struct exception_table_entry
*/
unsigned long search_exception_table(unsigned long pc)
{
unsigned long ret = 0;
const struct exception_table_entry *extab;
/* determine if the fault lay during a memcpy_user or a memset_user */
if (__frame->lr == (unsigned long) &__memset_user_error_lr &&
@ -55,9 +55,10 @@ unsigned long search_exception_table(unsigned long pc)
*/
return (unsigned long) &__memset_user_error_handler;
}
else if (__frame->lr == (unsigned long) &__memcpy_user_error_lr &&
(unsigned long) &memcpy <= pc && pc < (unsigned long) &__memcpy_end
) {
if (__frame->lr == (unsigned long) &__memcpy_user_error_lr &&
(unsigned long) &memcpy <= pc && pc < (unsigned long) &__memcpy_end
) {
/* the fault occurred in a protected memset
* - we search for the return address (in LR) instead of the program counter
* - it was probably during a copy_to/from_user()
@ -65,27 +66,10 @@ unsigned long search_exception_table(unsigned long pc)
return (unsigned long) &__memcpy_user_error_handler;
}
#ifndef CONFIG_MODULES
/* there is only the kernel to search. */
ret = search_one_table(__start___ex_table, __stop___ex_table - 1, pc);
return ret;
extab = search_exception_tables(pc);
if (extab)
return extab->fixup;
#else
/* the kernel is the last "module" -- no need to treat it special */
unsigned long flags;
struct module *mp;
return 0;
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, pc);
if (ret)
break;
}
spin_unlock_irqrestore(&modlist_lock, flags);
return ret;
#endif
} /* end search_exception_table() */