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/* Initialize CPU feature data via IFUNC relocation.
Copyright (C) 2015-2021 Free Software Foundation, Inc.
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/>. */
#include <ldsodefs.h>
#ifdef SHARED
# include <cpu-features.c>
/* NB: Normally, DL_PLATFORM_INIT calls init_cpu_features to initialize
CPU features in dynamic executable. But when loading ld.so inside of
static executable, DL_PLATFORM_INIT isn't called and IFUNC relocation
is used to call init_cpu_features. In static executable, it is called
once by IFUNC relocation. In dynamic executable, it is called twice
by DL_PLATFORM_INIT and by IFUNC relocation. */
extern void __x86_cpu_features (void) attribute_hidden;
const void (*__x86_cpu_features_p) (void) attribute_hidden
= __x86_cpu_features;
void
_dl_x86_init_cpu_features (void)
{
struct cpu_features *cpu_features = __get_cpu_features ();
if (cpu_features->basic.kind == arch_kind_unknown)
init_cpu_features (cpu_features);
}
__ifunc (__x86_cpu_features, __x86_cpu_features, NULL, void,
_dl_x86_init_cpu_features);
#endif
#undef __x86_get_cpu_features
const struct cpu_features *
__x86_get_cpu_features (unsigned int max)
{
if (max > COMMON_CPUID_INDEX_MAX)
return NULL;
return &GLRO(dl_x86_cpu_features);
}
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