_lwp.c revision 1.2 
1/*	$NetBSD: _lwp.c,v 1.2 2005/06/12 05:21:25 lukem 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 Wayne Knowles
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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *        This product includes software developed by the NetBSD
21 *        Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40#if defined(LIBC_SCCS) && !defined(lint)
41__RCSID("$NetBSD: _lwp.c,v 1.2 2005/06/12 05:21:25 lukem Exp $");
42#endif /* LIBC_SCCS and not lint */
43
44#include "namespace.h"
45#include <sys/types.h>
46#include <ucontext.h>
47#include <lwp.h>
48#include <stdlib.h>
49#include <machine/frame.h>
50
51void
52_lwp_makecontext(ucontext_t *u, void (*start)(void *),
53	void *arg, void *private, caddr_t stack_base, size_t stack_size)
54{
55	caddr_t sp;
56	__greg_t *gr;
57
58	getcontext(u);
59	gr = u->uc_mcontext.__gregs;
60	u->uc_link = NULL;
61
62	u->uc_stack.ss_sp = stack_base;
63	u->uc_stack.ss_size = stack_size;
64	sp = stack_base + HPPA_FRAME_SIZE;
65
66	gr[_REG_PCOQH] = (__greg_t) start;
67	gr[_REG_PCOQT] = (__greg_t) start + 4;
68	gr[_REG_RP] = (__greg_t) _lwp_exit;
69	gr[_REG_ARG0] = (__greg_t) arg;
70	gr[_REG_SP] = (__greg_t) sp;
71}
72