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52 lines
2.1 KiB
C
52 lines
2.1 KiB
C
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/* Inline functions for dynamic linking.
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Copyright (C) 1995-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _DL_STATIC_TLS_H
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#define _DL_STATIC_TLS_H
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/* This macro is used as a callback from elf_machine_rel{a,} when a
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static TLS reloc is about to be performed. Since (in dl-load.c) we
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permit dynamic loading of objects that might use such relocs, we
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have to check whether each use is actually doable. If the object
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whose TLS segment the reference resolves to was allocated space in
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the static TLS block at startup, then it's ok. Otherwise, we make
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an attempt to allocate it in surplus space on the fly. If that
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can't be done, we fall back to the error that DF_STATIC_TLS is
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intended to produce. */
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#define HAVE_STATIC_TLS(map, sym_map) \
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(__builtin_expect ((sym_map)->l_tls_offset != NO_TLS_OFFSET \
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&& ((sym_map)->l_tls_offset \
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!= FORCED_DYNAMIC_TLS_OFFSET), 1))
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#define CHECK_STATIC_TLS(map, sym_map) \
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do { \
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if (!HAVE_STATIC_TLS (map, sym_map)) \
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_dl_allocate_static_tls (sym_map); \
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} while (0)
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#define TRY_STATIC_TLS(map, sym_map) \
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(__builtin_expect ((sym_map)->l_tls_offset \
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!= FORCED_DYNAMIC_TLS_OFFSET, 1) \
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&& (__builtin_expect ((sym_map)->l_tls_offset != NO_TLS_OFFSET, 1) \
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|| _dl_try_allocate_static_tls (sym_map, true) == 0))
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int _dl_try_allocate_static_tls (struct link_map *map, bool optional)
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attribute_hidden;
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#endif
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