1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24*0Sstevel@tonic-gate * Use is subject to license terms.
25*0Sstevel@tonic-gate */
26*0Sstevel@tonic-gate
27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
28*0Sstevel@tonic-gate
29*0Sstevel@tonic-gate /*
30*0Sstevel@tonic-gate * Context-saving routine used for pipelines. Designed for use only
31*0Sstevel@tonic-gate * with kmdb_setcontext, and with the assumption that func() will never
32*0Sstevel@tonic-gate * return.
33*0Sstevel@tonic-gate */
34*0Sstevel@tonic-gate
35*0Sstevel@tonic-gate #include <strings.h>
36*0Sstevel@tonic-gate #include <ucontext.h>
37*0Sstevel@tonic-gate #include <sys/types.h>
38*0Sstevel@tonic-gate #include <sys/stack.h>
39*0Sstevel@tonic-gate
40*0Sstevel@tonic-gate #include <kmdb/kmdb_context_impl.h>
41*0Sstevel@tonic-gate #include <mdb/mdb_kreg.h>
42*0Sstevel@tonic-gate
43*0Sstevel@tonic-gate void
kmdb_makecontext(ucontext_t * ucp,void (* func)(void *),void * arg,caddr_t stk,size_t stksize)44*0Sstevel@tonic-gate kmdb_makecontext(ucontext_t *ucp, void (*func)(void *), void *arg, caddr_t stk,
45*0Sstevel@tonic-gate size_t stksize)
46*0Sstevel@tonic-gate {
47*0Sstevel@tonic-gate /*
48*0Sstevel@tonic-gate * Top-of-stack must be rounded down to STACK_ALIGN and
49*0Sstevel@tonic-gate * there must be a minimum frame for the register window.
50*0Sstevel@tonic-gate */
51*0Sstevel@tonic-gate uintptr_t stack = (((uintptr_t)stk + stksize - 1) &
52*0Sstevel@tonic-gate ~(STACK_ALIGN - 1)) - SA(MINFRAME);
53*0Sstevel@tonic-gate
54*0Sstevel@tonic-gate /* clear the top stack frame */
55*0Sstevel@tonic-gate bzero((void *)stack, SA(MINFRAME));
56*0Sstevel@tonic-gate
57*0Sstevel@tonic-gate /* fill in registers of interest */
58*0Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_PC] = (greg_t)func;
59*0Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_nPC] = (greg_t)func + 4;
60*0Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_O0] = (greg_t)arg;
61*0Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_SP] = (greg_t)(stack - STACK_BIAS);
62*0Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_O7] = NULL;
63*0Sstevel@tonic-gate ucp->uc_mcontext.gregs[REG_G7] = NULL;
64*0Sstevel@tonic-gate }
65