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87 lines
3.2 KiB
C
87 lines
3.2 KiB
C
/* Initialize CPU feature data via IFUNC relocation.
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Copyright (C) 2015-2025 Free Software Foundation, Inc.
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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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#include <ldsodefs.h>
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#ifdef SHARED
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# include <cpu-features.c>
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# include <gcc-macros.h>
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/* NB: Normally, DL_PLATFORM_INIT calls init_cpu_features to initialize
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CPU features in dynamic executable. But when loading ld.so inside of
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static executable, DL_PLATFORM_INIT isn't called and IFUNC relocation
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is used to call init_cpu_features. In static executable, it is called
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once by IFUNC relocation. In dynamic executable, it is called twice
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by DL_PLATFORM_INIT and by IFUNC relocation. */
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extern void __x86_cpu_features (void) attribute_hidden;
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void (*const __x86_cpu_features_p) (void) attribute_hidden
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= __x86_cpu_features;
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void
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_dl_x86_init_cpu_features (void)
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{
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struct cpu_features *cpu_features = __get_cpu_features ();
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if (cpu_features->basic.kind == arch_kind_unknown)
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{
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init_cpu_features (cpu_features);
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# if IS_IN (rtld)
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/* See isa-level.c. */
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# if defined GCCMACRO__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 \
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&& defined HAVE_X86_LAHF_SAHF && defined GCCMACRO__POPCNT__ \
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&& defined GCCMACRO__SSE3__ && defined GCCMACRO__SSSE3__ \
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&& defined GCCMACRO__SSE4_1__ && defined GCCMACRO__SSE4_2__
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if (!(cpu_features->isa_1 & GNU_PROPERTY_X86_ISA_1_V2))
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_dl_fatal_printf ("\
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Fatal glibc error: CPU does not support x86-64-v%d\n", 2);
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# if defined GCCMACRO__AVX__ && defined GCCMACRO__AVX2__ \
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&& defined GCCMACRO__F16C__ && defined GCCMACRO__FMA__ \
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&& defined GCCMACRO__LZCNT__ && defined HAVE_X86_MOVBE
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if (!(cpu_features->isa_1 & GNU_PROPERTY_X86_ISA_1_V3))
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_dl_fatal_printf ("\
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Fatal glibc error: CPU does not support x86-64-v%d\n", 3);
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# if defined GCCMACRO__AVX512F__ && defined GCCMACRO__AVX512BW__ \
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&& defined GCCMACRO__AVX512CD__ && defined GCCMACRO__AVX512DQ__ \
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&& defined GCCMACRO__AVX512VL__
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if (!(cpu_features->isa_1 & GNU_PROPERTY_X86_ISA_1_V4))
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_dl_fatal_printf ("\
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Fatal glibc error: CPU does not support x86-64-v%d\n", 4);
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# endif /* ISA level 4 */
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# endif /* ISA level 3 */
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# endif /* ISA level 2 */
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# ifdef GCCMACRO__APX_F__
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if (!CPU_FEATURE_USABLE_P (cpu_features, APX_F))
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_dl_fatal_printf ("\
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Fatal glibc error: CPU does not support APX\n");
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# endif
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# endif /* IS_IN (rtld) */
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}
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}
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__ifunc (__x86_cpu_features, __x86_cpu_features, NULL, void,
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_dl_x86_init_cpu_features);
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#endif
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#undef _dl_x86_get_cpu_features
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const struct cpu_features *
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_dl_x86_get_cpu_features (void)
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{
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return &GLRO(dl_x86_cpu_features);
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}
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