52 lines
2.1 KiB
C
52 lines
2.1 KiB
C
/* Inline functions for dynamic linking.
|
|
Copyright (C) 1995-2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _DL_STATIC_TLS_H
|
|
#define _DL_STATIC_TLS_H
|
|
|
|
/* This macro is used as a callback from elf_machine_rel{a,} when a
|
|
static TLS reloc is about to be performed. Since (in dl-load.c) we
|
|
permit dynamic loading of objects that might use such relocs, we
|
|
have to check whether each use is actually doable. If the object
|
|
whose TLS segment the reference resolves to was allocated space in
|
|
the static TLS block at startup, then it's ok. Otherwise, we make
|
|
an attempt to allocate it in surplus space on the fly. If that
|
|
can't be done, we fall back to the error that DF_STATIC_TLS is
|
|
intended to produce. */
|
|
#define HAVE_STATIC_TLS(map, sym_map) \
|
|
(__builtin_expect ((sym_map)->l_tls_offset != NO_TLS_OFFSET \
|
|
&& ((sym_map)->l_tls_offset \
|
|
!= FORCED_DYNAMIC_TLS_OFFSET), 1))
|
|
|
|
#define CHECK_STATIC_TLS(map, sym_map) \
|
|
do { \
|
|
if (!HAVE_STATIC_TLS (map, sym_map)) \
|
|
_dl_allocate_static_tls (sym_map); \
|
|
} while (0)
|
|
|
|
#define TRY_STATIC_TLS(map, sym_map) \
|
|
(__builtin_expect ((sym_map)->l_tls_offset \
|
|
!= FORCED_DYNAMIC_TLS_OFFSET, 1) \
|
|
&& (__builtin_expect ((sym_map)->l_tls_offset != NO_TLS_OFFSET, 1) \
|
|
|| _dl_try_allocate_static_tls (sym_map, true) == 0))
|
|
|
|
int _dl_try_allocate_static_tls (struct link_map *map, bool optional)
|
|
attribute_hidden;
|
|
|
|
#endif
|