cloudabi64_thread.c revision 316574 
1/*-
2 * Copyright (c) 2015 Nuxi, https://nuxi.nl/
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: stable/11/sys/compat/cloudabi64/cloudabi64_thread.c 316574 2017-04-06 15:10:36Z ed $");
28
29#include <sys/param.h>
30#include <sys/proc.h>
31#include <sys/systm.h>
32
33#include <contrib/cloudabi/cloudabi64_types.h>
34
35#include <compat/cloudabi64/cloudabi64_proto.h>
36#include <compat/cloudabi64/cloudabi64_util.h>
37
38struct thread_create_args {
39	cloudabi64_threadattr_t attr;
40	uint64_t tcb;
41	lwpid_t tid;
42};
43
44static int
45initialize_thread(struct thread *td, void *thunk)
46{
47	struct thread_create_args *args = thunk;
48
49	/* Save the thread ID, so it can be returned. */
50	args->tid = td->td_tid;
51
52	/* Set up initial register contents. */
53	return (cloudabi64_thread_setregs(td, &args->attr, args->tcb));
54}
55
56int
57cloudabi64_sys_thread_create(struct thread *td,
58    struct cloudabi64_sys_thread_create_args *uap)
59{
60	struct thread_create_args args;
61	int error;
62
63	error = copyin(uap->attr, &args.attr, sizeof(args.attr));
64	if (error != 0)
65		return (error);
66
67	/* Remove some space on the top of the stack for the TCB. */
68	args.tcb = rounddown(args.attr.stack + args.attr.stack_len -
69	    sizeof(cloudabi64_tcb_t), _Alignof(cloudabi64_tcb_t));
70	args.attr.stack_len = args.tcb - args.attr.stack;
71
72	error = thread_create(td, NULL, initialize_thread, &args);
73	if (error != 0)
74		return (error);
75	td->td_retval[0] = args.tid;
76	return (0);
77}
78