linux-imx

/* Rewritten by Rusty Russell, on the backs of many others...

   Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.

​

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.

​

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

​

    You should have received a copy of the GNU General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

#include <linux/ftrace.h>

#include <linux/memory.h>

#include <linux/extable.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/init.h>

#include <linux/kprobes.h>

#include <linux/filter.h>

​

#include <asm/sections.h>

#include <linux/uaccess.h>

​

/*

 * mutex protecting text section modification (dynamic code patching).

 * some users need to sleep (allocating memory...) while they hold this lock.

 *

 * Note: Also protects SMP-alternatives modification on x86.

 *

 * NOT exported to modules - patching kernel text is a really delicate matter.

 */

DEFINE_MUTEX(text_mutex);

​

extern struct exception_table_entry __start___ex_table[];

extern struct exception_table_entry __stop___ex_table[];

​

/* Cleared by build time tools if the table is already sorted. */

u32 __initdata __visible main_extable_sort_needed = 1;

​

/* Sort the kernel's built-in exception table */

void __init sort_main_extable(void)

{

    if (main_extable_sort_needed && __stop___ex_table > __start___ex_table) {

        pr_notice("Sorting __ex_table...\n");

        sort_extable(__start___ex_table, __stop___ex_table);

    }

}

​

/* Given an address, look for it in the exception tables. */

const struct exception_table_entry *search_exception_tables(unsigned long addr)

{

    const struct exception_table_entry *e;

​

    e = search_extable(__start___ex_table,

               __stop___ex_table - __start___ex_table, addr);

    if (!e)

        e = search_module_extables(addr);