1 | /* Get loaded objects program headers. |
2 | Copyright (C) 2001-2016 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 <http://www.gnu.org/licenses/>. */ |
19 | |
20 | #include <errno.h> |
21 | #include <ldsodefs.h> |
22 | #include <stddef.h> |
23 | #include <libc-lock.h> |
24 | |
25 | static void |
26 | cancel_handler (void *arg __attribute__((unused))) |
27 | { |
28 | __rtld_lock_unlock_recursive (GL(dl_load_write_lock)); |
29 | } |
30 | |
31 | hidden_proto (__dl_iterate_phdr) |
32 | int |
33 | __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info, |
34 | size_t size, void *data), void *data) |
35 | { |
36 | struct link_map *l; |
37 | struct dl_phdr_info info; |
38 | int ret = 0; |
39 | |
40 | /* Make sure nobody modifies the list of loaded objects. */ |
41 | __rtld_lock_lock_recursive (GL(dl_load_write_lock)); |
42 | __libc_cleanup_push (cancel_handler, NULL); |
43 | |
44 | /* We have to determine the namespace of the caller since this determines |
45 | which namespace is reported. */ |
46 | size_t nloaded = GL(dl_ns)[0]._ns_nloaded; |
47 | Lmid_t ns = 0; |
48 | #ifdef SHARED |
49 | const void *caller = RETURN_ADDRESS (0); |
50 | for (Lmid_t cnt = GL(dl_nns) - 1; cnt > 0; --cnt) |
51 | for (struct link_map *l = GL(dl_ns)[cnt]._ns_loaded; l; l = l->l_next) |
52 | { |
53 | /* We have to count the total number of loaded objects. */ |
54 | nloaded += GL(dl_ns)[cnt]._ns_nloaded; |
55 | |
56 | if (caller >= (const void *) l->l_map_start |
57 | && caller < (const void *) l->l_map_end |
58 | && (l->l_contiguous |
59 | || _dl_addr_inside_object (l, (ElfW(Addr)) caller))) |
60 | ns = cnt; |
61 | } |
62 | #endif |
63 | |
64 | for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next) |
65 | { |
66 | info.dlpi_addr = l->l_real->l_addr; |
67 | info.dlpi_name = l->l_real->l_name; |
68 | info.dlpi_phdr = l->l_real->l_phdr; |
69 | info.dlpi_phnum = l->l_real->l_phnum; |
70 | info.dlpi_adds = GL(dl_load_adds); |
71 | info.dlpi_subs = GL(dl_load_adds) - nloaded; |
72 | info.dlpi_tls_data = NULL; |
73 | info.dlpi_tls_modid = l->l_real->l_tls_modid; |
74 | if (info.dlpi_tls_modid != 0) |
75 | info.dlpi_tls_data = GLRO(dl_tls_get_addr_soft) (l->l_real); |
76 | ret = callback (&info, sizeof (struct dl_phdr_info), data); |
77 | if (ret) |
78 | break; |
79 | } |
80 | |
81 | /* Release the lock. */ |
82 | __libc_cleanup_pop (0); |
83 | __rtld_lock_unlock_recursive (GL(dl_load_write_lock)); |
84 | |
85 | return ret; |
86 | } |
87 | hidden_def (__dl_iterate_phdr) |
88 | |
89 | weak_alias (__dl_iterate_phdr, dl_iterate_phdr); |
90 | |