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/*
* linux/arch/i386/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)
{
/* Some versions of the linker are buggy and do not align the
__start pointer along with the section, thus we may be low. */
if ((long)first & 3)
(long)first = ((long)first | 3) + 1;
while (first <= last) {
const struct exception_table_entry *mid;
long diff;
mid = (last - first) / 2 + first;
diff = mid->insn - value;
if (diff == 0)
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;
#ifdef CONFIG_MODULES
struct module *mp;
#endif
/* Search the kernel's table first. */
ret = search_one_table(__start___ex_table,
__stop___ex_table-1, addr);
if (ret)
return ret;
#ifdef CONFIG_MODULES
for (mp = module_list; mp != NULL; mp = mp->next) {
if (mp->exceptinfo.start != NULL) {
ret = search_one_table(mp->exceptinfo.start,
mp->exceptinfo.stop-1, addr);
if (ret)
return ret;
}
}
#endif
return 0;
}
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