extable.c
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/*
* linux/arch/frv/mm/extable.c
*/
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
extern const void __memset_end, __memset_user_error_lr, __memset_user_error_handler;
extern const void __memcpy_end, __memcpy_user_error_lr, __memcpy_user_error_handler;
extern spinlock_t modlist_lock;
/*****************************************************************************/
/*
* see if there's a fixup handler available to deal with a kernel fault
*/
unsigned long search_exception_table(unsigned long pc)
{
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 &&
(unsigned long) &memset <= pc && pc < (unsigned long) &__memset_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 clear_user()
*/
return (unsigned long) &__memset_user_error_handler;
}
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()
*/
return (unsigned long) &__memcpy_user_error_handler;
}
extab = search_exception_tables(pc);
if (extab)
return extab->fixup;
return 0;
} /* end search_exception_table() */