sysdeps/unix/sysv/linux/microblaze/vfork.S

   1 /* Copyright (C) 2005-2015 Free Software Foundation, Inc.
   2
   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; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20 #define _ERRNO_H        1
  21 #include <bits/errno.h>
  22 #include <tcb-offsets.h>
  23
  24 /* Clone the calling process, but without copying the whole address space.
  25    The calling process is suspended until the new process exits or is
  26    replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
  27    and the process ID of the new process to the old process.  */
  28
  29 ENTRY (__vfork)
  30
  31 #ifdef __NR_vfork
  32         DO_CALL (vfork, 0)
  33 #else
  34         DO_CALL (fork, 0)
  35 #endif
  36         addik   r12,r0,-4095
  37         cmpu    r12,r12,r3
  38         bgei    r12,SYSCALL_ERROR_LABEL
  39         rtsd    r15,8
  40         nop
  41
  42 PSEUDO_END (__vfork)
  43 libc_hidden_def (__vfork)
  44
  45 weak_alias (__vfork, vfork)