sysdeps/mach/i386/machine-sp.h

   1 /* Machine-specific function to return the stack pointer.  i386 version.
   2    Copyright (C) 1994,97,2001 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 _MACHINE_SP_H
  21 #define _MACHINE_SP_H
  22
  23 /* Return the current stack pointer.  */
  24
  25 #define __thread_stack_pointer() ({                                           \
  26   void *__sp__;                                                               \
  27   __asm__ ("movl %%esp, %0" : "=r" (__sp__));                                 \
  28   __sp__;                                                                     \
  29 })
  30
  31 #endif  /* machine-sp.h */