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glibc  2.9
machine-sp.h
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00001 /* Machine-specific function to return the stack pointer.  i386 version.
00002    Copyright (C) 1994,97,2001 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #ifndef _MACHINE_SP_H
00021 #define _MACHINE_SP_H
00022 
00023 /* Return the current stack pointer.  */
00024 
00025 #define __thread_stack_pointer() ({                                         \
00026   void *__sp__;                                                             \
00027   __asm__ ("movl %%esp, %0" : "=r" (__sp__));                               \
00028   __sp__;                                                            \
00029 })
00030 
00031 #endif /* machine-sp.h */