xref: /illumos-gate/usr/src/lib/libc/port/sys/ucontext.c (revision 1da57d551424de5a9d469760be7c4b4d4f10a755)
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 #pragma weak _getustack = getustack
28 #pragma weak _setustack = setustack
29 
30 #include "lint.h"
31 #include <ucontext.h>
32 #include <sys/syscall.h>
33 
34 /*
35  * __getcontext() must be implemented in assembler, as opposed to
36  * the other members of the SYS_context family (see __getcontext.s)
37  * because we must be careful to get the precise context of the caller.
38  */
39 
40 int
__setcontext(const ucontext_t * ucp)41 __setcontext(const ucontext_t *ucp)
42 {
43 	return (syscall(SYS_context, 1, ucp));
44 }
45 
46 int
getustack(stack_t ** spp)47 getustack(stack_t **spp)
48 {
49 	return (syscall(SYS_context, 2, spp));
50 }
51 
52 int
setustack(stack_t * sp)53 setustack(stack_t *sp)
54 {
55 	return (syscall(SYS_context, 3, sp));
56 }
57