Viewing file:  extable.c (1.23 KB) -rw-r--r--
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/*
* linux/arch/m68k/mm/extable.c
*/
#include <linux/config.h>
#include <linux/module.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 unsigned long
search_one_table(const struct exception_table_entry *first,
const struct exception_table_entry *last,
unsigned long value)
{
while (first <= last) {
const struct exception_table_entry *mid;
long diff;
mid = (last - first) / 2 + first;
diff = value - mid->insn;
if (diff >= 0 && diff <= 2)
return mid->fixup;
else if (diff > 0)
first = mid+1;
else
last = mid-1;
}
return 0;
}
unsigned long
search_exception_table(unsigned long addr)
{
unsigned long ret;
#ifndef CONFIG_MODULES
/* There is only the kernel to search. */
ret = search_one_table(__start___ex_table, __stop___ex_table-1, addr);
if (ret) return ret;
#else
/* The kernel is the last "module" -- no need to treat it special. */
struct module *mp;
for (mp = module_list; mp != NULL; mp = mp->next) {
if (mp->ex_table_start == NULL)
continue;
ret = search_one_table(mp->ex_table_start,
mp->ex_table_end-1, addr);
if (ret) return ret;
}
#endif
return 0;
}
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