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
  23 extern struct exception_table_entry __start___ex_table[];
  24 extern struct exception_table_entry __stop___ex_table[];
  25
  26 /* Sort the kernel's built-in exception table */
  27 void __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. */
  33 const 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
  43 static int core_kernel_text(unsigned long addr)
  44 {
  45         if (addr >= (unsigned long)_stext &&
  46             addr <= (unsigned long)_etext)
  47                 return 1;
  48
  49         if (addr >= (unsigned long)_sinittext &&
  50             addr <= (unsigned long)_einittext)
  51                 return 1;
  52         return 0;
  53 }
  54
  55 int __kernel_text_address(unsigned long addr)
  56 {
  57         if (core_kernel_text(addr))
  58                 return 1;
  59         return __module_text_address(addr) != NULL;
  60 }
  61
  62 int kernel_text_address(unsigned long addr)
  63 {
  64         if (core_kernel_text(addr))
  65                 return 1;
  66         return module_text_address(addr) != NULL;
  67 }