extable.c

来自「优龙2410linux2.6.8内核源代码」· C语言 代码 · 共 31 行

/*
 * linux/arch/i386/mm/extable.c
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/spinlock.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)
{
        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;
}