1 /* Support for GNU properties. Generic version.
2 Copyright (C) 2018-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
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
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
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.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #ifndef _DL_PROP_H
20 #define _DL_PROP_H
21
22 /* The following functions are used by the dynamic loader and the
23 dlopen machinery to process PT_NOTE and PT_GNU_PROPERTY entries in
24 the binary or shared object. The notes can be used to change the
25 behaviour of the loader, and as such offer a flexible mechanism
26 for hooking in various checks related to ABI tags or implementing
27 "flag day" ABI transitions. */
28
29 static inline void __attribute__ ((always_inline))
_rtld_main_check(struct link_map * m,const char * program)30 _rtld_main_check (struct link_map *m, const char *program)
31 {
32 }
33
34 static inline void __attribute__ ((always_inline))
_dl_open_check(struct link_map * m)35 _dl_open_check (struct link_map *m)
36 {
37 }
38
39 static inline void __attribute__ ((always_inline))
_dl_process_pt_note(struct link_map * l,int fd,const ElfW (Phdr)* ph)40 _dl_process_pt_note (struct link_map *l, int fd, const ElfW(Phdr) *ph)
41 {
42 }
43
44 /* Called for each property in the NT_GNU_PROPERTY_TYPE_0 note of L,
45 processing of the properties continues until this returns 0. */
46 static inline int __attribute__ ((always_inline))
_dl_process_gnu_property(struct link_map * l,int fd,uint32_t type,uint32_t datasz,void * data)47 _dl_process_gnu_property (struct link_map *l, int fd, uint32_t type,
48 uint32_t datasz, void *data)
49 {
50 /* Continue until GNU_PROPERTY_1_NEEDED is found. */
51 if (type == GNU_PROPERTY_1_NEEDED)
52 {
53 if (datasz == 4)
54 l->l_1_needed = *(unsigned int *) data;
55 return 0;
56 }
57 return 1;
58 }
59
60 #endif /* _DL_PROP_H */
61