kmodsrc/helper.c

   1 /*  Copyright (C) 2007-2009  Ksplice, Inc.
   2  *  Authors: Jeff Arnold, Anders Kaseorg, Tim Abbott
   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, version 2.
   6  *
   7  *  This program is distributed in the hope that it will be useful,
   8  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *  GNU General Public License for more details.
  11  *
  12  *  You should have received a copy of the GNU General Public License
  13  *  along with this program; if not, write to the Free Software
  14  *  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  15  *  02110-1301, USA.
  16  */
  17
  18 #ifdef KSPLICE_STANDALONE
  19 #include "ksplice.h"
  20 #else
  21 #include <linux/ksplice.h>
  22 #endif
  23
  24 extern struct ksplice_reloc ksplice_relocs[], ksplice_relocs_end[];
  25 extern struct ksplice_section ksplice_sections[], ksplice_sections_end[];
  26 extern struct ksplice_symbol ksplice_symbols[], ksplice_symbols_end[];
  27 #ifdef KSPLICE_NEED_PARAINSTRUCTIONS
  28 extern struct paravirt_patch_site parainstructions[], parainstructions_end[];
  29 #endif
  30 #ifdef KSPLICE_STANDALONE
  31 extern struct ksplice_system_map ksplice_system_map[],
  32     ksplice_system_map_end[];
  33 #endif /* KSPLICE_STANDALONE */
  34
  35 /* Defined in primary.c */
  36 #define pack KSPLICE_UNIQ(pack)
  37 extern struct ksplice_pack pack;
  38
  39 #define PTR(p) ({ static const volatile typeof(&*p) p##_ptr = p; p##_ptr; })
  40
  41 static int init_helper(void)
  42 {
  43         pack.helper_relocs = PTR(ksplice_relocs);
  44         pack.helper_relocs_end = PTR(ksplice_relocs_end);
  45         pack.helper_sections = PTR(ksplice_sections);
  46         pack.helper_sections_end = PTR(ksplice_sections_end);
  47         pack.helper_symbols = PTR(ksplice_symbols);
  48         pack.helper_symbols_end = PTR(ksplice_symbols_end);
  49 #ifdef KSPLICE_NEED_PARAINSTRUCTIONS
  50         pack.helper_parainstructions = PTR(parainstructions);
  51         pack.helper_parainstructions_end = PTR(parainstructions_end);
  52 #endif
  53 #ifdef KSPLICE_STANDALONE
  54         pack.helper_system_map = PTR(ksplice_system_map);
  55         pack.helper_system_map_end = PTR(ksplice_system_map_end);
  56 #endif /* KSPLICE_STANDALONE */
  57         return init_ksplice_pack(&pack);
  58 }
  59
  60 static void cleanup_helper(void)
  61 {
  62         cleanup_ksplice_pack(&pack);
  63 }
  64
  65 module_init(init_helper);
  66 module_exit(cleanup_helper);
  67
  68 MODULE_AUTHOR("Ksplice, Inc.");
  69 MODULE_DESCRIPTION("Ksplice rebootless update helper module");
  70 #ifdef KSPLICE_VERSION
  71 MODULE_VERSION(KSPLICE_VERSION);
  72 #endif
  73 MODULE_LICENSE("GPL v2");