1/*
2 * linux/arch/frv/mm/extable.c
3 */
4
5#include <linux/module.h>
6#include <linux/spinlock.h>
7#include <asm/uaccess.h>
8
9extern const void __memset_end, __memset_user_error_lr, __memset_user_error_handler;
10extern const void __memcpy_end, __memcpy_user_error_lr, __memcpy_user_error_handler;
11extern spinlock_t modlist_lock;
12
13
14/*****************************************************************************/
15/*
16 * see if there's a fixup handler available to deal with a kernel fault
17 */
18unsigned long search_exception_table(unsigned long pc)
19{
20	const struct exception_table_entry *extab;
21
22	/* determine if the fault lay during a memcpy_user or a memset_user */
23	if (__frame->lr == (unsigned long) &__memset_user_error_lr &&
24	    (unsigned long) &memset <= pc && pc < (unsigned long) &__memset_end
25	    ) {
26		/* the fault occurred in a protected memset
27		 * - we search for the return address (in LR) instead of the program counter
28		 * - it was probably during a clear_user()
29		 */
30		return (unsigned long) &__memset_user_error_handler;
31	}
32
33	if (__frame->lr == (unsigned long) &__memcpy_user_error_lr &&
34	    (unsigned long) &memcpy <= pc && pc < (unsigned long) &__memcpy_end
35	    ) {
36		/* the fault occurred in a protected memset
37		 * - we search for the return address (in LR) instead of the program counter
38		 * - it was probably during a copy_to/from_user()
39		 */
40		return (unsigned long) &__memcpy_user_error_handler;
41	}
42
43	extab = search_exception_tables(pc);
44	if (extab)
45		return extab->fixup;
46
47	return 0;
48
49} /* end search_exception_table() */
50