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efbbd9c33a
Store ISA level in the portion of the unused upper 32 bits of the hwcaps field in cache and the unused pad field in aux cache. ISA level is stored and checked only for shared objects in glibc-hwcaps subdirectories. The shared objects in the default directories aren't checked since there are no fallbacks for these shared objects. Tested on x86-64-v2, x86-64-v3 and x86-64-v4 machines with --disable-hardcoded-path-in-tests and --enable-hardcoded-path-in-tests.
32 lines
1.3 KiB
C
32 lines
1.3 KiB
C
/* Support for reading ISA level in /etc/ld.so.cache files written by
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Linux ldconfig. x86 version.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <sys/platform/x86.h>
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/* Return true if the ISA level in ENTRY is compatible with CPU. */
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static inline bool
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dl_cache_hwcap_isa_level_compatible (struct file_entry_new *entry)
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{
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const struct cpu_features *cpu_features = __get_cpu_features ();
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unsigned int isa_level
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= 1 << ((entry->hwcap >> 32) & DL_CACHE_HWCAP_ISA_LEVEL_MASK);
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return (isa_level & cpu_features->isa_1) == isa_level;
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}
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