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
36 static 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
42 int
kctl_mod_decompress(struct modctl * modp)43 kctl_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
60 void
kctl_mod_loaded(struct modctl * modp)61 kctl_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*/
82 void
kctl_mod_changed(uint_t why,struct modctl * what)83 kctl_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 */
92 void
kctl_mod_notify_reg(void)93 kctl_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
101 void
kctl_mod_notify_unreg(void)102 kctl_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