LXR linux/kernel/extable.c

   1/* Rewritten by Rusty Russell, on the backs of many others...
   2   Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17*/
  18#include <linux/module.h>
  19#include <linux/init.h>
  20#include <asm/uaccess.h>
  21#include <asm/sections.h>
  22
  23extern struct exception_table_entry __start___ex_table[];
  24extern struct exception_table_entry __stop___ex_table[];
  25
  26/* Sort the kernel's built-in exception table */
  27void __init sort_main_extable(void)
  28{
  29        sort_extable(__start___ex_table, __stop___ex_table);
  30}
  31
  32/* Given an address, look for it in the exception tables. */
  33const struct exception_table_entry *search_exception_tables(unsigned long addr)
  34{
  35        const struct exception_table_entry *e;
  36
  37        e = search_extable(__start___ex_table, __stop___ex_table-1, addr);
  38        if (!e)
  39                e = search_module_extables(addr);
  40        return e;
  41}
  42
  43int core_kernel_text(unsigned long addr)
  44{
  45        if (addr >= (unsigned long)_stext &&
  46            addr <= (unsigned long)_etext)
  47                return 1;
  48
  49        if (system_state == SYSTEM_BOOTING &&
  50            addr >= (unsigned long)_sinittext &&
  51            addr <= (unsigned long)_einittext)
  52                return 1;
  53        return 0;
  54}
  55
  56int __kernel_text_address(unsigned long addr)
  57{
  58        if (core_kernel_text(addr))
  59                return 1;
  60        return __module_text_address(addr) != NULL;
  61}
  62
  63int kernel_text_address(unsigned long addr)
  64{
  65        if (core_kernel_text(addr))
  66                return 1;
  67        return module_text_address(addr) != NULL;
  68}
  69