[PATCH 5/17] FRV: Support module exception tables

[David Howells]

The attached patch fixes the exception table handling so that modules
exceptions are dealt with.

Signed-Off-By: David Howells <dhowells@xxxxxxxxxx>
---
warthog>diffstat -p1 frv-extab-2615.diff
 arch/frv/mm/extable.c |   34 +++++++++-------------------------
 1 files changed, 9 insertions(+), 25 deletions(-)

diff -uNrp /warthog/kernels/linux-2.6.15/arch/frv/mm/extable.c linux-2.6.15-frv/arch/frv/mm/extable.c
--- /warthog/kernels/linux-2.6.15/arch/frv/mm/extable.c	2005-03-02 12:07:44.000000000 +0000
+++ linux-2.6.15-frv/arch/frv/mm/extable.c	2006-01-06 14:43:43.000000000 +0000
@@ -43,7 +43,7 @@ static inline unsigned long search_one_t
  */
 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(uns
 		 */
 		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(uns
 		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;
-
-#else
-	/* the kernel is the last "module" -- no need to treat it special */
-	unsigned long flags;
-	struct module *mp;
+	extab = search_exception_tables(pc);
+	if (extab)
+		return extab->fixup;
 
-	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;
-	}
+	return 0;
 
-	spin_unlock_irqrestore(&modlist_lock, flags);
-	return ret;
-#endif
 } /* end search_exception_table() */
-
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