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| 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)) |
| 30 | _rtld_main_check (struct link_map *m, const char *program) |
| 31 | { |
| 32 | } |
| 33 | |
| 34 | static inline void __attribute__ ((always_inline)) |
| 35 | _dl_open_check (struct link_map *m) |
| 36 | { |
| 37 | } |
| 38 | |
| 39 | static inline void __attribute__ ((always_inline)) |
| 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)) |
| 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 |
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