1/* Resolve conflicts against already prelinked libraries.
2 Copyright (C) 2001-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If
18 not, see <https://www.gnu.org/licenses/>. */
19
20#include <errno.h>
21#include <libintl.h>
22#include <stdlib.h>
23#include <unistd.h>
24#include <ldsodefs.h>
25#include <sys/mman.h>
26#include <sys/param.h>
27#include <sys/types.h>
28#include "dynamic-link.h"
29
30void
31_dl_resolve_conflicts (struct link_map *l, ElfW(Rela) *conflict,
32 ElfW(Rela) *conflictend)
33{
34#if ! ELF_MACHINE_NO_RELA
35 if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_RELOC))
36 _dl_debug_printf ("\nconflict processing: %s\n", DSO_FILENAME (l->l_name));
37
38 {
39 /* Do the conflict relocation of the object and library GOT and other
40 data. */
41
42 /* This macro is used as a callback from the ELF_DYNAMIC_RELOCATE code. */
43#define RESOLVE_MAP(ref, version, flags) (*ref = NULL, NULL)
44#define RESOLVE(ref, version, flags) (*ref = NULL, 0)
45#define RESOLVE_CONFLICT_FIND_MAP(map, r_offset) \
46 do { \
47 while ((resolve_conflict_map->l_map_end < (ElfW(Addr)) (r_offset)) \
48 || (resolve_conflict_map->l_map_start > (ElfW(Addr)) (r_offset))) \
49 resolve_conflict_map = resolve_conflict_map->l_next; \
50 \
51 (map) = resolve_conflict_map; \
52 } while (0)
53
54 /* Prelinking makes no sense for anything but the main namespace. */
55 assert (l->l_ns == LM_ID_BASE);
56 struct link_map *resolve_conflict_map __attribute__ ((__unused__))
57 = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
58
59#include "dynamic-link.h"
60
61 /* Override these, defined in dynamic-link.h. */
62#undef CHECK_STATIC_TLS
63#define CHECK_STATIC_TLS(ref_map, sym_map) ((void) 0)
64#undef TRY_STATIC_TLS
65#define TRY_STATIC_TLS(ref_map, sym_map) (0)
66
67 GL(dl_num_cache_relocations) += conflictend - conflict;
68
69 for (; conflict < conflictend; ++conflict)
70 elf_machine_rela (l, conflict, NULL, NULL, (void *) conflict->r_offset,
71 0);
72 }
73#endif
74}
75