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 http://www.opensolaris.org/os/licensing.
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/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#pragma weak _getcontext = getcontext
33
34#include "lint.h"
35#include "thr_uberdata.h"
36#include <ucontext.h>
37#include <sys/types.h>
38
39int
40getcontext(ucontext_t *ucp)
41{
42	greg_t *reg;
43
44	ucp->uc_flags = UC_ALL;
45	if (__getcontext(ucp))
46		return (-1);
47
48	/*
49	 * Note that %o1 and %g1 are modified by the system call
50	 * routine. ABI calling conventions specify that the caller
51	 * cannot depend upon %o0 through %o5 nor %g1, so no effort is
52	 * made to maintain these registers. %o0 is forced to reflect
53	 * an affirmative return code.
54	 */
55	reg = ucp->uc_mcontext.gregs;
56	reg[REG_SP] = getfp();
57	reg[REG_O7] = caller();
58	reg[REG_PC] = reg[REG_O7] + 8;
59	reg[REG_nPC] = reg[REG_PC] + 4;
60	reg[REG_O0] = 0;
61
62	return (0);
63}
64