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("$FreeBSD$");
28
29 #include <sys/param.h>
30 #include <sys/proc.h>
31 #include <sys/systm.h>
32
33 #include <contrib/cloudabi/cloudabi32_types.h>
34
35 #include <compat/cloudabi32/cloudabi32_proto.h>
36 #include <compat/cloudabi32/cloudabi32_util.h>
37
38 struct thread_create_args {
39 cloudabi32_threadattr_t attr;
40 uint32_t tcb;
41 lwpid_t tid;
42 };
43
44 static int
initialize_thread(struct thread * td,void * thunk)45 initialize_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 (cloudabi32_thread_setregs(td, &args->attr, args->tcb));
54 }
55
56 int
cloudabi32_sys_thread_create(struct thread * td,struct cloudabi32_sys_thread_create_args * uap)57 cloudabi32_sys_thread_create(struct thread *td,
58 struct cloudabi32_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(cloudabi32_tcb_t), _Alignof(cloudabi32_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