1/* vfork for Linux, RISC-V version.
2   Copyright (C) 2005-2022 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, see
17   <https://www.gnu.org/licenses/>.  */
18
19/* vfork() is just a special case of clone().  */
20
21#include <sys/asm.h>
22#include <sysdep.h>
23#define __ASSEMBLY__
24#include <asm/signal.h>
25
26#define CLONE_VM      0x00000100 /* Set if VM shared between processes.  */
27#define CLONE_VFORK   0x00004000 /* Set if the parent wants the child to
28				    wake it up on mm_release.  */
29
30	.text
31LEAF (__libc_vfork)
32
33	li	a0, (CLONE_VFORK | CLONE_VM | SIGCHLD)
34	mv	a1, sp
35
36	li	a7, __NR_clone
37	scall
38
39	bltz	a0, 1f
40	ret
41
421:	j		__syscall_error
43END (__libc_vfork)
44
45weak_alias (__libc_vfork, vfork)
46strong_alias (__libc_vfork, __vfork)
47libc_hidden_def (__vfork)
48