58d169ba9f
PR target/91833 * config/aarch64/lse-init.c: Include auto-target.h. Disable initialization if !HAVE_SYS_AUXV_H. * configure.ac (AC_CHECK_HEADERS): Add sys/auxv.h. * config.in, configure: Rebuild. From-SVN: r276134
48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
/* Out-of-line LSE atomics for AArch64 architecture, Init.
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Copyright (C) 2019 Free Software Foundation, Inc.
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Contributed by Linaro Ltd.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "auto-target.h"
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/* Define the symbol gating the LSE implementations. */
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_Bool __aarch64_have_lse_atomics
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__attribute__((visibility("hidden"), nocommon));
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/* Disable initialization of __aarch64_have_lse_atomics during bootstrap. */
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#if !defined(inhibit_libc) && defined(HAVE_SYS_AUXV_H)
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# include <sys/auxv.h>
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/* Disable initialization if the system headers are too old. */
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# if defined(AT_HWCAP) && defined(HWCAP_ATOMICS)
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static void __attribute__((constructor))
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init_have_lse_atomics (void)
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{
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unsigned long hwcap = getauxval (AT_HWCAP);
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__aarch64_have_lse_atomics = (hwcap & HWCAP_ATOMICS) != 0;
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}
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# endif /* HWCAP */
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#endif /* inhibit_libc */
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