nptl/sysdeps/i386/i686/tls.h

   1 /* Copyright (C) 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _TLS_H
  21
  22 /* Additional definitions for <tls.h> on i686 and up.  */
  23
  24
  25 /* Macros to load from and store into segment registers.  We can use
  26    the 32-bit instructions.  */
  27 #define TLS_GET_GS() \
  28   ({ int __seg; __asm ("movl %%gs, %0" : "=q" (__seg)); __seg; })
  29 #define TLS_SET_GS(val) \
  30   __asm ("movl %0, %%gs" :: "q" (val))
  31
  32
  33 /* Get the full set of definitions.  */
  34 #include "../tls.h"
  35
  36 #endif  /* tls.h */