1/*        $NetBSD: __clone.S,v 1.8 2020/05/05 20:43:47 skrll Exp $    */
2
3/*-
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Fredette.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/errno.h>
33#include "SYS.h"
34
35#ifdef WEAK_ALIAS
36          WEAK_ALIAS(clone, __clone)
37#endif
38
39/*
40 * int clone(int (*fn)(void *), void *stack, int flags, void *arg);
41 */
42ENTRY(__clone, 0)
43
44          /*
45           * Sanity checks: func and stack may not be NULL.
46           */
47          comb,=    %r0, %arg0, 8f
48           nop
49          comb,=    %r0, %arg1, 8f
50           nop
51
52          /*
53           * Put the func and arg arguments into a frame in the child's stack.
54           */
55          ldo       (HPPA_FRAME_SIZE * 2)(%arg1), %arg1
56          stw       %arg0, HPPA_FRAME_ARG(0)(%arg1)
57          stw       %arg3, HPPA_FRAME_ARG(1)(%arg1)
58
59          /*
60           * The system call expects (flags, stack).
61           */
62          copy      %arg2, %arg0
63          SYSCALL(__clone)
64          comb,<>,n %r0, %ret1, 9f
65          bv,n      %r0(%rp)
66
678:
68          b         __cerror
69           ldi      EINVAL, %t1
70
719:        /*
72           * Child: Reload the function and argument from the new stack.
73           */
74          ldw       HPPA_FRAME_ARG(0)(%sp), %r22
75          ldw       HPPA_FRAME_ARG(1)(%sp), %arg0
76
77          /* Call the clone's entry point. */
78          stw       %r19, HPPA_FRAME_ARG(2)(%sp)
79          bl        $$dyncall, %r31
80           copy     %r31, %rp
81          ldw       HPPA_FRAME_ARG(2)(%sp), %r19
82
83          /* Pass the return value to _exit(). */
84          copy      %ret0, %arg0
85          PIC_CALL(_exit)
86
87          /* NOTREACHED */
88EXIT(__clone)
89