Blame sysdeps/i386/i686/nptl/tls.h

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/* Copyright (C) 2002-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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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   <http://www.gnu.org/licenses/>.  */
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#ifndef _TLS_H
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/* Additional definitions for <tls.h> on i686 and up.  */
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/* Macros to load from and store into segment registers.  We can use
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   the 32-bit instructions.  */
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#define TLS_GET_GS() \
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  ({ int __seg; __asm ("movl %%gs, %0" : "=q" (__seg)); __seg; })
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#define TLS_SET_GS(val) \
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  __asm ("movl %0, %%gs" :: "q" (val))
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/* Get the full set of definitions.  */
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#include_next <tls.h>
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#endif	/* tls.h */