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glibc/elf/dynamic-link.h
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/* Inline functions for dynamic linking. | |
Copyright (C) 1995, 1996, 1997 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., 59 Temple Place - Suite 330, | |
Boston, MA 02111-1307, USA. */ | |
#include <elf.h> | |
#include <dl-machine.h> | |
#include <assert.h> | |
/* Global read-only variable defined in rtld.c which is nonzero if we | |
shall give more warning messages. */ | |
extern int _dl_verbose __attribute__ ((unused)); | |
/* Read the dynamic section at DYN and fill in INFO with indices DT_*. */ | |
static inline void __attribute__ ((unused)) | |
elf_get_dynamic_info (ElfW(Dyn) *dyn, | |
ElfW(Dyn) *info[DT_NUM + DT_PROCNUM + DT_VERSIONTAGNUM | |
+ DT_EXTRANUM]) | |
{ | |
unsigned int i; | |
for (i = 0; i < DT_NUM + DT_PROCNUM + DT_VERSIONTAGNUM + DT_EXTRANUM; ++i) | |
info[i] = NULL; | |
if (! dyn) | |
return; | |
while (dyn->d_tag != DT_NULL) | |
{ | |
if (dyn->d_tag < DT_NUM) | |
info[dyn->d_tag] = dyn; | |
else if (dyn->d_tag >= DT_LOPROC && | |
dyn->d_tag < DT_LOPROC + DT_PROCNUM) | |
info[dyn->d_tag - DT_LOPROC + DT_NUM] = dyn; | |
else if ((Elf32_Word) DT_VERSIONTAGIDX (dyn->d_tag) < DT_VERSIONTAGNUM) | |
info[DT_VERSIONTAGIDX (dyn->d_tag) + DT_NUM + DT_PROCNUM] = dyn; | |
else if ((Elf32_Word) DT_EXTRATAGIDX (dyn->d_tag) < DT_EXTRANUM) | |
info[DT_EXTRATAGIDX (dyn->d_tag) + DT_NUM + DT_PROCNUM | |
+ DT_VERSIONTAGNUM] = dyn; | |
else | |
assert (! "bad dynamic tag"); | |
dyn++; | |
} | |
if (info[DT_RELA]) | |
assert (info[DT_RELAENT]->d_un.d_val == sizeof (ElfW(Rela))); | |
if (info[DT_REL]) | |
assert (info[DT_RELENT]->d_un.d_val == sizeof (ElfW(Rel))); | |
if (info[DT_PLTREL]) | |
assert (info[DT_PLTREL]->d_un.d_val == DT_REL || | |
info[DT_PLTREL]->d_un.d_val == DT_RELA); | |
} | |
#ifdef RESOLVE | |
/* Get the definitions of `elf_dynamic_do_rel' and `elf_dynamic_do_rela'. | |
These functions are almost identical, so we use cpp magic to avoid | |
duplicating their code. It cannot be done in a more general function | |
because we must be able to completely inline. */ | |
#if ! ELF_MACHINE_NO_REL | |
#include "do-rel.h" | |
#define ELF_DYNAMIC_DO_REL(map, lazy) \ | |
if ((map)->l_info[DT_REL]) \ | |
elf_dynamic_do_rel ((map), DT_REL, DT_RELSZ, 0); \ | |
if ((map)->l_info[DT_PLTREL] && \ | |
(map)->l_info[DT_PLTREL]->d_un.d_val == DT_REL) \ | |
elf_dynamic_do_rel ((map), DT_JMPREL, DT_PLTRELSZ, (lazy)); | |
#else | |
#define ELF_DYNAMIC_DO_REL(map, lazy) /* Nothing to do. */ | |
#endif | |
#if ! ELF_MACHINE_NO_RELA | |
#define DO_RELA | |
#include "do-rel.h" | |
#define ELF_DYNAMIC_DO_RELA(map, lazy) \ | |
if ((map)->l_info[DT_RELA]) \ | |
elf_dynamic_do_rela ((map), DT_RELA, DT_RELASZ, 0); \ | |
if ((map)->l_info[DT_PLTREL] && \ | |
(map)->l_info[DT_PLTREL]->d_un.d_val == DT_RELA) \ | |
elf_dynamic_do_rela ((map), DT_JMPREL, DT_PLTRELSZ, (lazy)); | |
#else | |
#define ELF_DYNAMIC_DO_RELA(map, lazy) /* Nothing to do. */ | |
#endif | |
/* This can't just be an inline function because GCC is too dumb | |
to inline functions containing inlines themselves. */ | |
#define ELF_DYNAMIC_RELOCATE(map, lazy) \ | |
do { \ | |
int edr_lazy = elf_machine_runtime_setup((map), (lazy)); \ | |
ELF_DYNAMIC_DO_REL ((map), edr_lazy); \ | |
ELF_DYNAMIC_DO_RELA ((map), edr_lazy); \ | |
} while (0) | |
#endif |