sysdeps/mach/powerpc/machine-sp.h

   1 /* Machine-specific function to return the stack pointer.  PowerPC version.
   2    Copyright (C) 2001, 2007 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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _MACHINE_SP_H
  21 #define _MACHINE_SP_H
  22
  23 /* Return the current stack pointer.  */
  24
  25 #ifndef _EXTERN_INLINE
  26 /* Make sure this function is included in hurd/threadvar-inlines.c.  */
  27 # ifdef _HURD_THREADVAR_H_EXTERN_INLINE
  28 #  define _EXTERN_INLINE _HURD_THREADVAR_H_EXTERN_INLINE
  29 # else
  30 #  define _EXTERN_INLINE __extern_inline
  31 # endif
  32 #endif
  33
  34 _EXTERN_INLINE void *
  35 __thread_stack_pointer (void)
  36 {
  37   register void *__sp__;
  38   __asm__ ("mr %0, 1" : "=r" (__sp__));
  39   return __sp__;
  40 }
  41
  42 #endif  /* machine-sp.h */