1/* Copyright (C) 2004-2021 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
3
4   The GNU C Library is free software; you can redistribute it and/or
5   modify it under the terms of the GNU Lesser General Public
6   License as published by the Free Software Foundation; either
7   version 2.1 of the License, or (at your option) any later version.
8
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   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, see
16   <https://www.gnu.org/licenses/>.  */
17
18#include <sysdep.h>
19#define _ERRNO_H	1
20#include <bits/errno.h>
21#include <tcb-offsets.h>
22
23/* Clone the calling process, but without copying the whole address space.
24   The calling process is suspended until the new process exits or is
25   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
26   and the process ID of the new process to the old process.  */
27
28ENTRY (__libc_vfork)
29
30	mov.w	.L1, r3
31	trapa	#0x10
32	mov     r0, r1
33
34	mov	#-12, r2
35	shad	r2, r1
36	not	r1, r1			// r1=0 means r0 = -1 to -4095
37	tst	r1, r1			// i.e. error in linux
38	bf	.Lpseudo_end
39	SYSCALL_ERROR_HANDLER
40.Lpseudo_end:
41	rts
42	 nop
43.L1:
44	.word	__NR_vfork
45	.align	2
46PSEUDO_END (__libc_vfork)
47
48#if IS_IN (libc)
49weak_alias (__libc_vfork, vfork)
50strong_alias (__libc_vfork, __vfork)
51libc_hidden_def (__vfork)
52#endif
53