1 /* Copyright (C) 1991, 1994, 1995, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
25 /* Clone the calling process, but without copying the whole address space.
26 The calling process is suspended until the 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. */
31 /* Pop the return PC value into A0. */
34 /* Stuff the syscall number in D0 and trap into the kernel. */
37 bcs error /* Branch forward if it failed. */
39 /* It succeeded. See which fork we're in. D1 is now 0 for the
40 parent and 1 for the child. Decrement it to make it -1 (all
41 bits set) for the parent, and 0 (no bits set) for the child.
42 Then AND it with D0, so the parent gets D0&-1==R0, and the child
47 /* Jump to the return PC. */
55 weak_alias (__vfork, vfork)