acrn-kernel/arch/x86_64/mm/extable.c

36 lines
858 B
C

/*
* linux/arch/x86_64/mm/extable.c
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <asm/uaccess.h>
/* Simple binary search */
const struct exception_table_entry *
search_extable(const struct exception_table_entry *first,
const struct exception_table_entry *last,
unsigned long value)
{
/* Work around a B stepping K8 bug */
if ((value >> 32) == 0)
value |= 0xffffffffUL << 32;
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;
else if (diff < 0)
first = mid+1;
else
last = mid-1;
}
return NULL;
}