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 2004 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 /*
30 * libctf open/close interposition layer
31 *
32 * This interposition layer serves two purposes. First, it allows the
33 * introduction of a kmdb-specific implementation of ctf_open(). The normal
34 * ctf_open() call open(2)s a file, and reads the CTF data directly from it.
35 * No such facility is available in kmdb, as kmdb does not run in userland. We
36 * can, however, observe that kmdb uses this interface only to read CTF data
37 * from dmods. dmods, as viewed by kmdb, do have CTF data, but they have it
38 * in a form that is best accessed by ctf_bufopen(). This interposition layer
39 * allows us to translate ctf_open() calls into ctf_bufopen() calls.
40 *
41 * The second purpose of the interposition layer is to reduce the work needed
42 * to call mdb_ctf_bufopen.
43 */
44
45 #include <sys/types.h>
46 #include <sys/kobj.h>
47 #include <libctf.h>
48 #include <ctf_impl.h>
49
50 #include <kmdb/kmdb_module.h>
51 #include <mdb/mdb_ctf.h>
52 #include <mdb/mdb_string.h>
53 #include <mdb/mdb_debug.h>
54 #include <mdb/mdb_err.h>
55 #include <mdb/mdb.h>
56
57 static kmdb_modctl_t *
mdb_ctf_name2ctl(const char * pathname)58 mdb_ctf_name2ctl(const char *pathname)
59 {
60 mdb_var_t *v;
61
62 if ((v = mdb_nv_lookup(&mdb.m_dmodctl, strbasename(pathname))) ==
63 NULL)
64 return (NULL);
65
66 return ((kmdb_modctl_t *)MDB_NV_COOKIE(v));
67 }
68
69 ctf_file_t *
mdb_ctf_open(const char * pathname,int * errp)70 mdb_ctf_open(const char *pathname, int *errp)
71 {
72 struct module *mp;
73 kmdb_modctl_t *kmc;
74 ctf_file_t *ctfp;
75
76 if ((kmc = mdb_ctf_name2ctl(pathname)) == NULL) {
77 if (errp != NULL)
78 *errp = ENOENT;
79 return (NULL);
80 }
81
82 mp = kmc->kmc_modctl->mod_mp;
83 if (mp->ctfdata == NULL) {
84 if (errp != NULL)
85 *errp = ECTF_NOCTFDATA;
86 return (NULL);
87 }
88
89 if ((ctfp = mdb_ctf_bufopen(mp->ctfdata, mp->ctfsize, mp->symtbl,
90 mp->symhdr, mp->strings, mp->strhdr, errp)) == NULL)
91 return (NULL);
92
93 mdb_dprintf(MDB_DBG_MODULE, "loaded %lu bytes of CTF data for %s\n",
94 (ulong_t)mp->ctfsize, kmc->kmc_modname);
95
96 return (ctfp);
97 }
98
99 void
mdb_ctf_close(ctf_file_t * fp)100 mdb_ctf_close(ctf_file_t *fp)
101 {
102 ctf_close(fp);
103 }
104