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82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
/* Do relocations for ELF dynamic linking.
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/* This file may be included twice, to define both
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`elf_dynamic_do_rel' and `elf_dynamic_do_rela'. */
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#ifdef DO_RELA
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#define elf_dynamic_do_rel elf_dynamic_do_rela
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#define Elf32_Rel Elf32_Rela
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#define elf_machine_rel elf_machine_rela
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#endif
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/* Perform the relocations in MAP on the running program image as specified
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by RELTAG, SZTAG. *RESOLVE is called to resolve symbol values; it
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modifies its argument pointer to point to the defining symbol, and
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returns the base load address of the defining object. If LAZY is
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nonzero, this is the first pass on PLT relocations; they should be set
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up to call _dl_runtime_resolve, rather than fully resolved now. */
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static inline void
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elf_dynamic_do_rel (struct link_map *map,
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int reltag, int sztag,
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Elf32_Addr (*resolve) (const Elf32_Sym **symbol,
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Elf32_Addr r_offset),
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int lazy)
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{
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const Elf32_Sym *const symtab
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= (const Elf32_Sym *) (map->l_addr + map->l_info[DT_SYMTAB]->d_un.d_ptr);
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const Elf32_Rel *r
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= (const Elf32_Rel *) (map->l_addr + map->l_info[reltag]->d_un.d_ptr);
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const Elf32_Rel *end = &r[map->l_info[sztag]->d_un.d_val / sizeof *r];
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if (lazy)
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/* Doing lazy PLT relocations; they need very little info. */
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for (; r < end; ++r)
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elf_machine_lazy_rel (map, r);
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else
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for (; r < end; ++r)
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{
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const Elf32_Sym *definer = &symtab[ELF32_R_SYM (r->r_info)];
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Elf32_Addr loadbase;
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if (ELF32_R_SYM (r->r_info) == STN_UNDEF)
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loadbase = 0; /* This value will not be consulted. */
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else if (ELF32_ST_BIND (definer->st_info) == STB_LOCAL)
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/* Local symbols always refer to the containing object. */
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loadbase = map->l_addr;
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else
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{
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if (resolve)
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loadbase = (*resolve) (&definer, r->r_offset);
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else
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{
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assert (definer->st_shndx != SHN_UNDEF);
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loadbase = map->l_addr;
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}
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}
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elf_machine_rel (map, r, loadbase, definer);
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}
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}
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#undef elf_dynamic_do_rel
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#undef Elf32_Rel
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#undef elf_machine_rel
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