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
  17    not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _MACHINE_SP_H
  20 #define _MACHINE_SP_H
  21
  22 /* Return the current stack pointer.  */
  23
  24 #ifndef _EXTERN_INLINE
  25 /* Make sure this function is included in hurd/threadvar-inlines.c.  */
  26 # ifdef _HURD_THREADVAR_H_EXTERN_INLINE
  27 #  define _EXTERN_INLINE _HURD_THREADVAR_H_EXTERN_INLINE
  28 # else
  29 #  define _EXTERN_INLINE __extern_inline
  30 # endif
  31 #endif
  32
  33 _EXTERN_INLINE void *
  34 __thread_stack_pointer (void)
  35 {
  36   register void *__sp__;
  37   __asm__ ("mr %0, 1" : "=r" (__sp__));
  38   return __sp__;
  39 }
  40
  41 #endif  /* machine-sp.h */