kctl_mod.c revision 11053:f33a1c7f3155 
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 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*
27 * Tracking of kernel module loads and unloads
28 */
29
30#include <kmdb/kmdb_kdi.h>
31#include <kmdb/kctl/kctl.h>
32#include <sys/kobj.h>
33#include <sys/kobj_impl.h>
34#include <sys/ctf_api.h>
35
36static kobj_notify_list_t kctl_mod_notifiers[] = {
37	{ kctl_mod_changed, KOBJ_NOTIFY_MODLOADED },
38	{ kctl_mod_changed, KOBJ_NOTIFY_MODUNLOADING },
39	{ NULL, 0 }
40};
41
42int
43kctl_mod_decompress(struct modctl *modp)
44{
45	ctf_file_t *fp;
46	struct module *mp = modp->mod_mp;
47	int rc;
48
49	if ((kmdb_kdi_get_flags() & KMDB_KDI_FL_NOCTF) || mp->ctfdata == NULL)
50		return (0);
51
52	if ((fp = ctf_modopen(mp, &rc)) == NULL)
53		return (rc);
54
55	ctf_close(fp);
56
57	return (0);
58}
59
60void
61kctl_mod_loaded(struct modctl *modp)
62{
63	int rc;
64
65	mutex_enter(&mod_lock);
66	if (modp->mod_mp == NULL) {
67		mutex_exit(&mod_lock);
68		return;
69	}
70
71	if ((rc = kctl_mod_decompress(modp)) != 0) {
72		cmn_err(CE_WARN, "failed to decompress CTF data for %s: %s\n",
73		    modp->mod_modname, ctf_errmsg(rc));
74	}
75	mutex_exit(&mod_lock);
76
77	if (!(kmdb_kdi_get_flags() & KMDB_KDI_FL_NOMODS))
78		kctl_dmod_autoload(modp->mod_modname);
79}
80
81/*ARGSUSED*/
82void
83kctl_mod_changed(uint_t why, struct modctl *what)
84{
85	if (why == KOBJ_NOTIFY_MODLOADED)
86		kctl_mod_loaded(what);
87}
88
89/*
90 * Tell krtld to notify kmdb when modules have been loaded and unloaded
91 */
92void
93kctl_mod_notify_reg(void)
94{
95	kobj_notify_list_t *kn;
96
97	for (kn = kctl_mod_notifiers; kn->kn_func != NULL; kn++)
98		(void) kobj_notify_add(kn);
99}
100
101void
102kctl_mod_notify_unreg(void)
103{
104	kobj_notify_list_t *kn;
105
106	for (kn = kctl_mod_notifiers; kn->kn_func != NULL; kn++)
107		(void) kobj_notify_remove(kn);
108}
109