blob: 5ffa658e40cde6afc7d63a15b9e612ff45b16e46 [file] [log] [blame]
/*
* Kernel exception handling table support. Derived from arch/i386/mm/extable.c.
*
* Copyright (C) 2000 Hewlett-Packard Co
* Copyright (C) 2000 John Marvin (jsm@fc.hp.com)
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/ptrace.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 const struct exception_table_entry *
search_one_table (const struct exception_table_entry *first,
const struct exception_table_entry *last,
unsigned long addr)
{
/* Abort early if the search value is out of range. */
if ((addr < first->addr) || (addr > last->addr))
return 0;
while (first <= last) {
const struct exception_table_entry *mid;
long diff;
mid = first + ((last - first)/2);
diff = mid->addr - addr;
if (diff == 0)
return mid;
else if (diff < 0)
first = mid+1;
else
last = mid-1;
}
return 0;
}
const struct exception_table_entry *
search_exception_table (unsigned long addr)
{
#ifndef CONFIG_MODULES
/* There is only the kernel to search. */
return search_one_table(__start___ex_table,
__stop___ex_table - 1,
addr);
#else
/* The kernel is the last "module" -- no need to treat it special. */
struct module *mp;
for (mp = module_list; mp ; mp = mp->next) {
const struct exception_table_entry *ret;
if (!mp->ex_table_start)
continue;
ret = search_one_table(mp->ex_table_start, mp->ex_table_end - 1,
addr);
if (ret)
return ret;
}
return 0;
#endif
}