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 2003 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <mdb/mdb_modapi.h>
30 #include <mdb/mdb_ks.h>
31 #include <sys/logindmux_impl.h>
32 
33 /*
34  * Print our peer's upper queue pointer, and our lower queue pointer.
35  */
36 void
logdmux_uqinfo(const queue_t * q,char * buf,size_t nbytes)37 logdmux_uqinfo(const queue_t *q, char *buf, size_t nbytes)
38 {
39 	struct tmx tmx;
40 	uintptr_t peer, lower;
41 	queue_t lq;
42 
43 	/*
44 	 * First, get the pointer to our lower write queue.
45 	 */
46 	(void) mdb_vread(&tmx, sizeof (tmx), (uintptr_t)q->q_ptr);
47 	lower = (uintptr_t)tmx.muxq;
48 
49 	/*
50 	 * Now read in the lower's peer, and follow that to up to our peer.
51 	 */
52 	(void) mdb_vread(&lq, sizeof (lq), (uintptr_t)tmx.peerq);
53 	(void) mdb_vread(&tmx, sizeof (tmx), (uintptr_t)lq.q_ptr);
54 	peer = (uintptr_t)tmx.rdq;
55 
56 	(void) mdb_snprintf(buf, nbytes, "peer rq    : %p\nlower wq   : %p",
57 	    peer, lower);
58 }
59 
60 /*
61  * Print our peer's lower queue pointer, and our upper queue pointer.
62  */
63 void
logdmux_lqinfo(const queue_t * q,char * buf,size_t nbytes)64 logdmux_lqinfo(const queue_t *q, char *buf, size_t nbytes)
65 {
66 	struct tmx tmx;
67 
68 	(void) mdb_vread(&tmx, sizeof (tmx), (uintptr_t)q->q_ptr);
69 	(void) mdb_snprintf(buf, nbytes, "peer wq    : %p\nupper rq   : %p",
70 	    (uintptr_t)tmx.peerq, (uintptr_t)tmx.rdq);
71 }
72 
73 uintptr_t
logdmux_lrnext(const queue_t * q)74 logdmux_lrnext(const queue_t *q)
75 {
76 	struct tmx tmx;
77 
78 	(void) mdb_vread(&tmx, sizeof (tmx), (uintptr_t)q->q_ptr);
79 	return ((uintptr_t)tmx.rdq);
80 }
81 
82 uintptr_t
logdmux_uwnext(const queue_t * q)83 logdmux_uwnext(const queue_t *q)
84 {
85 	struct tmx tmx;
86 
87 	(void) mdb_vread(&tmx, sizeof (tmx), (uintptr_t)q->q_ptr);
88 	return ((uintptr_t)tmx.muxq);
89 }
90 
91 static const mdb_qops_t logdmux_uqops = {
92 	logdmux_uqinfo, mdb_qrnext_default, logdmux_uwnext
93 };
94 
95 static const mdb_qops_t logdmux_lqops = {
96 	logdmux_lqinfo, logdmux_lrnext, mdb_qwnext_default
97 };
98 
99 static const mdb_modinfo_t modinfo = { MDB_API_VERSION };
100 
101 const mdb_modinfo_t *
_mdb_init(void)102 _mdb_init(void)
103 {
104 	GElf_Sym sym;
105 
106 	if (mdb_lookup_by_obj("logindmux", "logdmuxuwinit", &sym) == 0)
107 		mdb_qops_install(&logdmux_uqops, (uintptr_t)sym.st_value);
108 	if (mdb_lookup_by_obj("logindmux", "logdmuxlwinit", &sym) == 0)
109 		mdb_qops_install(&logdmux_lqops, (uintptr_t)sym.st_value);
110 
111 	return (&modinfo);
112 }
113 
114 void
_mdb_fini(void)115 _mdb_fini(void)
116 {
117 	GElf_Sym sym;
118 
119 	if (mdb_lookup_by_obj("logindmux", "logdmuxuwinit", &sym) == 0)
120 		mdb_qops_remove(&logdmux_uqops, (uintptr_t)sym.st_value);
121 	if (mdb_lookup_by_obj("logindmux", "logdmuxlwinit", &sym) == 0)
122 		mdb_qops_remove(&logdmux_lqops, (uintptr_t)sym.st_value);
123 }
124