sysdeps/unix/bsd/bsd4.4/kfreebsd/i386/getcontext.S

   1 /* Save current context.
   2    Copyright (C) 2006 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 #include <sysdep.h>
  21
  22 .text
  23 ENTRY(__getcontext)
  24         clc
  25         movl 0(%esp), %ecx      /* save the return PC value */
  26
  27         DO_CALL (getcontext, 1)
  28         jb SYSCALL_ERROR_LABEL
  29
  30         addl $4, %esp           /* remove stale return address */
  31         jmp  *%ecx
  32
  33 L(pseudo_end):
  34         ret
  35
  36 PSEUDO_END(__getcontext)
  37
  38 weak_alias(__getcontext, getcontext)