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

   1 /* Copyright (C) 2005-2013 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 <kernel-features.h>
  23 #include <tcb-offsets.h>
  24
  25 /* Clone the calling process, but without copying the whole address space.
  26    The calling process is suspended until the new process exits or is
  27    replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
  28    and the process ID of the new process to the old process.  */
  29
  30 ENTRY (__vfork)
  31
  32 #ifdef __NR_vfork
  33         DO_CALL (vfork, 0)
  34 #else
  35         DO_CALL (fork, 0)
  36 #endif
  37         addik   r12,r0,-4095
  38         cmpu    r12,r12,r3
  39         bgei    r12,SYSCALL_ERROR_LABEL
  40         rtsd    r15,8
  41         nop
  42
  43 PSEUDO_END (__vfork)
  44 libc_hidden_def (__vfork)
  45
  46 weak_alias (__vfork, vfork)