1 /* $NetBSD: _lwp.c,v 1.7 2011/02/24 04:28:43 joerg Exp $ */
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Nathan J. Williams.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 __RCSID("$NetBSD: _lwp.c,v 1.7 2011/02/24 04:28:43 joerg Exp $");
35 #endif /* LIBC_SCCS and not lint */
37 #include "namespace.h"
38 #include <sys/types.h>
45 _lwp_makecontext(ucontext_t
*u
, void (*start
)(void *),
46 void *arg
, void *private, caddr_t stack_base
, size_t stack_size
)
48 __greg_t
*gr
= u
->uc_mcontext
.__gregs
;
54 u
->uc_stack
.ss_sp
= stack_base
;
55 u
->uc_stack
.ss_size
= stack_size
;
57 /* LINTED uintptr_t is safe */
58 gr
[_REG_RIP
] = (uintptr_t)start
;
60 sp
= (void **) (((uintptr_t)(stack_base
+ stack_size
) & ~15));
62 /* LINTED __greg_t is safe */
63 gr
[_REG_RDI
] = (__greg_t
)arg
;
64 *--sp
= (void *) _lwp_exit
;
66 /* LINTED uintptr_t is safe */
67 gr
[_REG_URSP
] = (uintptr_t) sp
;
69 u
->uc_mcontext
._mc_tlsbase
= (uintptr_t)private;
70 u
->uc_flags
|= _UC_TLSBASE
;