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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Context-saving routine used for pipelines. Designed for use only
29 * with kmdb_setcontext.
30 */
31
32 #include <strings.h>
33 #include <ucontext.h>
34 #include <sys/types.h>
35 #include <sys/stack.h>
36
37 #include <kmdb/kmdb_context_impl.h>
38 #include <mdb/mdb_kreg.h>
39
40 void
kmdb_makecontext(ucontext_t * ucp,void (* func)(void *),void * arg,caddr_t stk,size_t stksize)41 kmdb_makecontext(ucontext_t *ucp, void (*func)(void *), void *arg, caddr_t stk,
42 size_t stksize)
43 {
44 uintptr_t *stack = (uintptr_t *)(((uintptr_t)stk + stksize - 1) &
45 ~(STACK_ALIGN - 1));
46
47 *stack-- = 0;
48
49 ucp->uc_mcontext.gregs[REG_PC] = (greg_t)func;
50 ucp->uc_mcontext.gregs[REG_SP] = (greg_t)stack;
51 ucp->uc_mcontext.gregs[REG_RDI] = (greg_t)arg;
52 }
53