usr/src/cmd/mdb/common/kmdb/kctl/kctl_mod.c

   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
  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
  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
  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
  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
 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 }