machine-sp.h

glibc 2.9,最新版的C语言库函数

/* Machine-specific function to return the stack pointer.  i386 version.
   Copyright (C) 1994,97,2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _MACHINE_SP_H
#define _MACHINE_SP_H

/* Return the current stack pointer.  */

#define __thread_stack_pointer() ({					      \
  void *__sp__;								      \
  __asm__ ("movl %%esp, %0" : "=r" (__sp__));				      \
  __sp__;								      \
})

#endif	/* machine-sp.h */