1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/* $NetBSD: __clone.S,v 1.1 2014/08/10 05:47:37 matt Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "SYS.h"
#include <sys/errno.h>
WEAK_ALIAS(clone, __clone)
/*
* int __clone(int (*fn)(void *), void *stack, int flags, void *arg);
*/
ENTRY(__clone)
/* test stack and function are not null */
cbz x0, .Leinval
cbz x1, .Leinval
/* place the arg and func onto the child's stack */
stp x3, x0, [x1, #-16]!
/* syscall expects (flags, stack) */
mov x0, x2
SYSTRAP(__clone)
_INVOKE_CERROR()
/*
* x1 and x0 are the same as from fork:
* x1 == 0 in parent process, x1 == 1 in child process.
* x0 == pid of child in parent, x0 == pid of parent in child.
*/
/* if this is the parent then just return the pid */
cbnz x1, 1f
/*
* This is the child
* load the function and arg off the stack
*/
ldp x0, x1, [sp], #16
/* call the function */
blr x1
/* call _exit with the returned value */
bl _C_LABEL(_exit)
1: ret
.Leinval:
mov x0, #EINVAL
b _C_LABEL(__cerror)
END(__clone)
|
