diff options
Diffstat (limited to 'elf/do-rel.h')
| -rw-r--r-- | elf/do-rel.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/elf/do-rel.h b/elf/do-rel.h new file mode 100644 index 0000000000..04643e8fac --- /dev/null +++ b/elf/do-rel.h @@ -0,0 +1,68 @@ +/* Do relocations for ELF dynamic linking. +Copyright (C) 1995 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +/* This file may be included twice, to define both + `elf_dynamic_do_rel' and `elf_dynamic_do_rela'. */ + +#ifdef DO_RELA +#define elf_dynamic_do_rel elf_dynamic_do_rela +#define Elf32_Rel Elf32_Rela +#define elf_machine_rel elf_machine_rela +#endif + + +/* Perform the relocations in MAP on the running program image as specified + by RELTAG, SZTAG. *RESOLVE is called to resolve symbol values; it + modifies its argument pointer to point to the defining symbol, and + returns the base load address of the defining object. */ + +static inline void +elf_dynamic_do_rel (struct link_map *map, + int reltag, int sztag, + Elf32_Addr (*resolve) (const Elf32_Sym **)) +{ + const Elf32_Sym *const symtab + = (const Elf32_Sym *) map->l_info[DT_SYMTAB]->d_un.d_ptr; + const Elf32_Rel *r = (const Elf32_Rel *) map->l_info[reltag]->d_un.d_ptr; + const Elf32_Rel *end = &r[map->l_info[sztag]->d_un.d_val / sizeof *r]; + + for (; r < end; ++r) + { + const Elf32_Sym *definer = &symtab[ELF32_R_SYM (r->r_info)]; + Elf32_Addr loadbase; + + if (ELF32_R_SYM (r->r_info) == STN_UNDEF) + loadbase = 0; /* This value will not be consulted. */ + else + { + if (resolve) + loadbase = (*resolve) (&definer); + else + { + assert (definer->st_shndx != SHN_UNDEF); + loadbase = map->l_addr; + } + } + elf_machine_rel (map, r, loadbase, definer); + } +} + +#undef elf_dynamic_do_rel +#undef Elf32_Rel +#undef elf_machine_rel |