glibc/sysdeps/i386/i686/nptl/tls.h
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C

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