mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-21 02:10:05 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
40 lines
1.6 KiB
ArmAsm
40 lines
1.6 KiB
ArmAsm
/* Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/* Since vfork shares the address space between the parent and child,
|
|
we must take care to avoid the child unwinding the stack frame and
|
|
clobbering it for the parent. */
|
|
|
|
.text
|
|
ENTRY (__vfork)
|
|
popl scratch /* Save the return PC in a register. */
|
|
DO_CALL (vfork, 0) /* Do the system call. */
|
|
pushl scratch /* Put the return PC back on the stack. */
|
|
jb syscall_error /* Branch if error. */
|
|
/* R1 is now 0 for the parent and 1 for the child. Decrement it to
|
|
make it -1 (all bits set) for the parent, and 0 (no bits set)
|
|
for the child. Then AND it with R0, so the parent gets
|
|
R0&-1==R0, and the child gets R0&0==0. */
|
|
decl r1
|
|
andl r1, r0
|
|
ret
|
|
|
|
weak_alias (__vfork, vfork)
|