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/*
* linux/arch/sparc64/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 unsigned long
search_one_table(const struct exception_table_entry *start,
const struct exception_table_entry *last,
unsigned long value, unsigned long *g2)
{
const struct exception_table_entry *first = start;
const struct exception_table_entry *mid;
long diff = 0;
while (first <= last) {
mid = (last - first) / 2 + first;
diff = mid->insn - value;
if (diff == 0) {
if (!mid->fixup) {
*g2 = 0;
return (mid + 1)->fixup;
} else
return mid->fixup;
} else if (diff < 0)
first = mid+1;
else
last = mid-1;
}
if (last->insn < value && !last->fixup && last[1].insn > value) {
*g2 = (value - last->insn)/4;
return last[1].fixup;
}
if (first > start && first[-1].insn < value
&& !first[-1].fixup && first->insn < value) {
*g2 = (value - first[-1].insn)/4;
return first->fixup;
}
return 0;
}
extern spinlock_t modlist_lock;
unsigned long
search_exception_table(unsigned long addr, unsigned long *g2)
{
unsigned long ret = 0, flags;
#ifndef CONFIG_MODULES
/* There is only the kernel to search. */
ret = search_one_table(__start___ex_table,
__stop___ex_table-1, addr, g2);
return ret;
#else
/* The kernel is the last "module" -- no need to treat it special. */
struct module *mp;
spin_lock_irqsave(&modlist_lock, flags);
for (mp = module_list; mp != NULL; mp = mp->next) {
if (mp->ex_table_start == NULL || !(mp->flags & (MOD_RUNNING | MOD_INITIALIZING)))
continue;
ret = search_one_table(mp->ex_table_start,
mp->ex_table_end-1, addr, g2);
if (ret)
break;
}
spin_unlock_irqrestore(&modlist_lock, flags);
return ret;
#endif
}
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