1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * This header file distributed under the terms of the CDDL.
23 * Portions Copyright 2008 Sun Microsystems, Inc. All Rights reserved.
24 */
25#ifndef _SYS_STACK_H
26#define	_SYS_STACK_H
27
28#include <pthread.h>
29
30#define	STACK_BIAS	0
31
32#ifdef __USE_GNU
33
34static inline int
35stack_getbounds(stack_t *sp)
36{
37	pthread_attr_t attr;
38	int rc;
39
40	rc = pthread_getattr_np(pthread_self(), &attr);
41	if (rc)
42		return (rc);
43
44	rc = pthread_attr_getstack(&attr, &sp->ss_sp, &sp->ss_size);
45	if (rc == 0)
46		sp->ss_flags = 0;
47
48	pthread_attr_destroy(&attr);
49
50	return (rc);
51}
52
53static inline int
54thr_stksegment(stack_t *sp)
55{
56	int rc;
57
58	rc = stack_getbounds(sp);
59	if (rc)
60		return (rc);
61
62	/*
63	 * thr_stksegment() is expected to set sp.ss_sp to the high stack
64	 * address, but the stack_getbounds() interface is expected to
65	 * set sp.ss_sp to the low address.  Adjust accordingly.
66	 */
67	sp->ss_sp = (void *)(((uintptr_t)sp->ss_sp) + sp->ss_size);
68	sp->ss_flags = 0;
69
70	return (rc);
71}
72
73#endif /* __USE_GNU */
74#endif /* _SYS_STACK_H */
75