| 1 | /* Inline functions for dynamic linking. |
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| 2 | Copyright (C) 1995-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _DL_STATIC_TLS_H |
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| 20 | #define _DL_STATIC_TLS_H |
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| 21 | |
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| 22 | /* This macro is used as a callback from elf_machine_rel{a,} when a |
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| 23 | static TLS reloc is about to be performed. Since (in dl-load.c) we |
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| 24 | permit dynamic loading of objects that might use such relocs, we |
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| 25 | have to check whether each use is actually doable. If the object |
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| 26 | whose TLS segment the reference resolves to was allocated space in |
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| 27 | the static TLS block at startup, then it's ok. Otherwise, we make |
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| 28 | an attempt to allocate it in surplus space on the fly. If that |
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| 29 | can't be done, we fall back to the error that DF_STATIC_TLS is |
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| 30 | intended to produce. */ |
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| 31 | #define HAVE_STATIC_TLS(map, sym_map) \ |
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| 32 | (__builtin_expect ((sym_map)->l_tls_offset != NO_TLS_OFFSET \ |
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| 33 | && ((sym_map)->l_tls_offset \ |
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| 34 | != FORCED_DYNAMIC_TLS_OFFSET), 1)) |
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| 35 | |
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| 36 | #define CHECK_STATIC_TLS(map, sym_map) \ |
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| 37 | do { \ |
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| 38 | if (!HAVE_STATIC_TLS (map, sym_map)) \ |
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| 39 | _dl_allocate_static_tls (sym_map); \ |
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| 40 | } while (0) |
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| 41 | |
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| 42 | #define TRY_STATIC_TLS(map, sym_map) \ |
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| 43 | (__builtin_expect ((sym_map)->l_tls_offset \ |
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| 44 | != FORCED_DYNAMIC_TLS_OFFSET, 1) \ |
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| 45 | && (__builtin_expect ((sym_map)->l_tls_offset != NO_TLS_OFFSET, 1) \ |
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| 46 | || _dl_try_allocate_static_tls (sym_map, true) == 0)) |
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| 47 | |
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| 48 | int _dl_try_allocate_static_tls (struct link_map *map, bool optional) |
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| 49 | attribute_hidden; |
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| 50 | |
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| 51 | #endif |
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| 52 | |
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