elf/do-rel.h

   1 /* Do relocations for ELF dynamic linking.
   2 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 /* This file may be included twice, to define both
  21    `elf_dynamic_do_rel' and `elf_dynamic_do_rela'.  */
  22
  23 #ifdef DO_RELA
  24 #define elf_dynamic_do_rel      elf_dynamic_do_rela
  25 #define Rel                     Rela
  26 #define elf_machine_rel         elf_machine_rela
  27 #endif
  28
  29
  30 /* Perform the relocations in MAP on the running program image as specified
  31    by RELTAG, SZTAG.  If LAZY is nonzero, this is the first pass on PLT
  32    relocations; they should be set up to call _dl_runtime_resolve, rather
  33    than fully resolved now.  */
  34
  35 static inline void
  36 elf_dynamic_do_rel (struct link_map *map,
  37                     int reltag, int sztag,
  38                     int lazy)
  39 {
  40   const ElfW(Sym) *const symtab
  41     = (const ElfW(Sym) *) (map->l_addr + map->l_info[DT_SYMTAB]->d_un.d_ptr);
  42   const ElfW(Rel) *r
  43     = (const ElfW(Rel) *) (map->l_addr + map->l_info[reltag]->d_un.d_ptr);
  44   const ElfW(Rel) *end = &r[map->l_info[sztag]->d_un.d_val / sizeof *r];
  45
  46   if (lazy)
  47     /* Doing lazy PLT relocations; they need very little info.  */
  48     for (; r < end; ++r)
  49       elf_machine_lazy_rel (map, r);
  50   else
  51     for (; r < end; ++r)
  52       elf_machine_rel (map, r, &symtab[ELFW(R_SYM) (r->r_info)]);
  53 }
  54
  55 #undef elf_dynamic_do_rel
  56 #undef Rel
  57 #undef elf_machine_rel