1 /* Resolve conflicts against already prelinked libraries.
2 Copyright (C) 2001-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If
17 not, see <https://www.gnu.org/licenses/>. */
26 #include <sys/param.h>
27 #include <sys/types.h>
28 #include "dynamic-link.h"
30 /* Used at loading time solely for prelink executable. It is not called
31 concurrently so it is be safe to defined as static. */
32 static struct link_map
*resolve_conflict_map
__attribute__ ((__unused__
));
34 /* This macro is used as a callback from the ELF_DYNAMIC_RELOCATE code. */
35 #define RESOLVE_MAP(map, scope, ref, version, flags) (*ref = NULL, NULL)
36 #define RESOLVE(ref, version, flags) (*ref = NULL, 0)
37 #define RESOLVE_CONFLICT_FIND_MAP(map, r_offset) \
39 while ((resolve_conflict_map->l_map_end < (ElfW(Addr)) (r_offset)) \
40 || (resolve_conflict_map->l_map_start > (ElfW(Addr)) (r_offset))) \
41 resolve_conflict_map = resolve_conflict_map->l_next; \
43 (map) = resolve_conflict_map; \
46 #include "dynamic-link.h"
49 _dl_resolve_conflicts (struct link_map
*l
, ElfW(Rela
) *conflict
,
50 ElfW(Rela
) *conflictend
)
52 #if ! ELF_MACHINE_NO_RELA
53 if (__glibc_unlikely (GLRO(dl_debug_mask
) & DL_DEBUG_RELOC
))
54 _dl_debug_printf ("\nconflict processing: %s\n", DSO_FILENAME (l
->l_name
));
57 /* Do the conflict relocation of the object and library GOT and other
60 /* Prelinking makes no sense for anything but the main namespace. */
61 assert (l
->l_ns
== LM_ID_BASE
);
62 resolve_conflict_map
= GL(dl_ns
)[LM_ID_BASE
]._ns_loaded
;
64 /* Override these, defined in dynamic-link.h. */
65 #undef CHECK_STATIC_TLS
66 #define CHECK_STATIC_TLS(ref_map, sym_map) ((void) 0)
68 #define TRY_STATIC_TLS(ref_map, sym_map) (0)
70 GL(dl_num_cache_relocations
) += conflictend
- conflict
;
72 for (; conflict
< conflictend
; ++conflict
)
73 elf_machine_rela (l
, NULL
, conflict
, NULL
, NULL
,
74 (void *) conflict
->r_offset
, 0);