6c03c2cf27
Reject SHN_UNDEF defns iff NOPLT is nonzero. * elf/link.h (_dl_lookup_symbol): Update prototype and comment. * elf/dl-runtime.c (fixup): Pass 1 to _dl_lookup_symbol for NOPLT. * elf/dlsym.c (dlsym): Pass 0. * elf/rtld.c (dl_main): Likewise. * elf/dl-reloc.c (_dl_relocate_object: resolve): Second arg R_OFFSET replaced with NOPLT flag. Pass it through to _dl_lookup_symbol. * elf/do-rel.h (elf_dynamic_do_rel): Update prototype of RESOLVE arg. Pass `elf_machine_pltrel_p (R->r_type)' result as NOPLT flag value. * sysdeps/i386/dl-machine.h (elf_machine_pltrel_p): New macro. * sysdeps/m68k/dl-machine.h (elf_machine_pltrel_p): Likewise. * sysdeps/stub/dl-machine.h (elf_machine_pltrel_p): Likewise.
47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/* dlsym -- Look up a symbol in a shared object loaded by `dlopen'.
|
|
Copyright (C) 1995, 1996 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. */
|
|
|
|
#include <stddef.h>
|
|
#include <link.h>
|
|
#include <dlfcn.h>
|
|
#include <setjmp.h>
|
|
|
|
|
|
void *
|
|
dlsym (void *handle, const char *name)
|
|
{
|
|
struct link_map *map = handle;
|
|
struct link_map *real_next;
|
|
Elf32_Addr loadbase;
|
|
const Elf32_Sym *ref = NULL;
|
|
int lose;
|
|
void doit (void)
|
|
{
|
|
loadbase = _dl_lookup_symbol (name, &ref, map, map->l_name, 0);
|
|
}
|
|
|
|
/* Confine the symbol scope to just this map. */
|
|
real_next = map->l_next;
|
|
map->l_next = NULL;
|
|
lose = _dlerror_run (doit);
|
|
map->l_next = real_next;
|
|
|
|
return lose ? NULL : (void *) (loadbase + ref->st_value);
|
|
}
|