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/* Thread-local storage handling in the ELF dynamic linker. x86-64 version.
Copyright (C) 2017-2025 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/>. */
#ifdef SHARED
/* Work around GCC PR58066, due to which __tls_get_addr may be called
with an unaligned stack. The compat implementation is in
tls_get_addr-compat.S. */
# include <dl-tls.h>
/* Define __tls_get_addr within elf/dl-tls.c under a different
name. */
extern __typeof__ (__tls_get_addr) ___tls_get_addr;
# define __tls_get_addr ___tls_get_addr
# include <elf/dl-tls.c>
# undef __tls_get_addr
hidden_ver (___tls_get_addr, __tls_get_addr)
/* Only handle slow paths for __tls_get_addr. */
attribute_hidden
void *
__tls_get_addr_slow (tls_index *ti)
{
dtv_t *dtv = THREAD_DTV ();
size_t gen = atomic_load_acquire (&GL(dl_tls_generation));
if (__glibc_unlikely (dtv[0].counter != gen)
/* See comment in __tls_get_addr in elf/dl-tls.c. */
&& !(_dl_tls_allocate_active ()
&& ti->ti_module < _dl_tls_initial_modid_limit))
return update_get_addr (ti, gen);
return tls_get_addr_tail (ti, dtv, NULL);
}
#else
/* No compatibility symbol needed. */
# include <elf/dl-tls.c>
#endif
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