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/* Ifunc selector for ___tls_get_addr.
Copyright (C) 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
# define ___tls_get_addr __redirect____tls_get_addr
# include <dl-tls.h>
# undef ___tls_get_addr
# undef __tls_get_addr
# define SYMBOL_NAME ___tls_get_addr
# include <init-arch.h>
extern __typeof (REDIRECT_NAME) OPTIMIZE (fnsave) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (fxsave) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (xsave) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (xsavec) attribute_hidden;
static inline void *
IFUNC_SELECTOR (void)
{
const struct cpu_features* cpu_features = __get_cpu_features ();
if (cpu_features->xsave_state_size != 0)
{
if (CPU_FEATURE_USABLE_P (cpu_features, XSAVEC))
return OPTIMIZE (xsavec);
else
return OPTIMIZE (xsave);
}
else if (CPU_FEATURE_USABLE_P (cpu_features, FXSR))
return OPTIMIZE (fxsave);
return OPTIMIZE (fnsave);
}
libc_ifunc_redirected (__redirect____tls_get_addr, ___tls_get_addr,
IFUNC_SELECTOR ());
/* The special thing about the x86 TLS ABI is that we have two
variants of the __tls_get_addr function with different calling
conventions. The GNU version, which we are mostly concerned here,
takes the parameter in a register. The name is changed by adding
an additional underscore at the beginning. The Sun version uses
the normal calling convention. */
rtld_hidden_proto (___tls_get_addr)
rtld_hidden_def (___tls_get_addr)
void *
__tls_get_addr (tls_index *ti)
{
return ___tls_get_addr (ti);
}
#endif
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