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 2002-2003 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <ctf_impl.h>
28
29 static int
extract_label_info(ctf_file_t * fp,const ctf_lblent_t ** ctl,uint_t * num_labels)30 extract_label_info(ctf_file_t *fp, const ctf_lblent_t **ctl, uint_t *num_labels)
31 {
32 const ctf_header_t *h;
33
34 /*
35 * Labels are only supported in V2 or later
36 */
37 if (fp->ctf_version < CTF_VERSION_2)
38 return (ctf_set_errno(fp, ECTF_NOTSUP));
39
40 h = (const ctf_header_t *)fp->ctf_data.cts_data;
41
42 /* LINTED - pointer alignment */
43 *ctl = (const ctf_lblent_t *)(fp->ctf_buf + h->cth_lbloff);
44 *num_labels = (h->cth_objtoff - h->cth_lbloff) / sizeof (ctf_lblent_t);
45
46 return (0);
47 }
48
49 /*
50 * Returns the topmost label, or NULL if any errors are encountered
51 */
52 const char *
ctf_label_topmost(ctf_file_t * fp)53 ctf_label_topmost(ctf_file_t *fp)
54 {
55 const ctf_lblent_t *ctlp;
56 const char *s;
57 uint_t num_labels;
58
59 if (extract_label_info(fp, &ctlp, &num_labels) == CTF_ERR)
60 return (NULL); /* errno is set */
61
62 if (num_labels == 0) {
63 (void) ctf_set_errno(fp, ECTF_NOLABELDATA);
64 return (NULL);
65 }
66
67 if ((s = ctf_strraw(fp, (ctlp + num_labels - 1)->ctl_label)) == NULL)
68 (void) ctf_set_errno(fp, ECTF_CORRUPT);
69
70 return (s);
71 }
72
73 /*
74 * Iterate over all labels. We pass the label string and the lblinfo_t struct
75 * to the specified callback function.
76 */
77 int
ctf_label_iter(ctf_file_t * fp,ctf_label_f * func,void * arg)78 ctf_label_iter(ctf_file_t *fp, ctf_label_f *func, void *arg)
79 {
80 const ctf_lblent_t *ctlp;
81 uint_t i, num_labels;
82 ctf_lblinfo_t linfo;
83 const char *lname;
84 int rc;
85
86 if (extract_label_info(fp, &ctlp, &num_labels) == CTF_ERR)
87 return (CTF_ERR); /* errno is set */
88
89 if (num_labels == 0)
90 return (ctf_set_errno(fp, ECTF_NOLABELDATA));
91
92 for (i = 0; i < num_labels; i++, ctlp++) {
93 if ((lname = ctf_strraw(fp, ctlp->ctl_label)) == NULL) {
94 ctf_dprintf("failed to decode label %u with "
95 "typeidx %u\n", ctlp->ctl_label, ctlp->ctl_typeidx);
96 return (ctf_set_errno(fp, ECTF_CORRUPT));
97 }
98
99 linfo.ctb_typeidx = ctlp->ctl_typeidx;
100 if ((rc = func(lname, &linfo, arg)) != 0)
101 return (rc);
102 }
103
104 return (0);
105 }
106
107 typedef struct linfo_cb_arg {
108 const char *lca_name; /* Label we want to retrieve info for */
109 ctf_lblinfo_t *lca_info; /* Where to store the info about the label */
110 } linfo_cb_arg_t;
111
112 static int
label_info_cb(const char * lname,const ctf_lblinfo_t * linfo,void * arg)113 label_info_cb(const char *lname, const ctf_lblinfo_t *linfo, void *arg)
114 {
115 /*
116 * If lname matches the label we are looking for, copy the
117 * lblinfo_t struct for the caller.
118 */
119 if (strcmp(lname, ((linfo_cb_arg_t *)arg)->lca_name) == 0) {
120 /*
121 * Allow caller not to allocate storage to test if label exists
122 */
123 if (((linfo_cb_arg_t *)arg)->lca_info != NULL)
124 bcopy(linfo, ((linfo_cb_arg_t *)arg)->lca_info,
125 sizeof (ctf_lblinfo_t));
126 return (1); /* Indicate we found a match */
127 }
128
129 return (0);
130 }
131
132 /*
133 * Retrieve information about the label with name "lname"
134 */
135 int
ctf_label_info(ctf_file_t * fp,const char * lname,ctf_lblinfo_t * linfo)136 ctf_label_info(ctf_file_t *fp, const char *lname, ctf_lblinfo_t *linfo)
137 {
138 linfo_cb_arg_t cb_arg;
139 int rc;
140
141 cb_arg.lca_name = lname;
142 cb_arg.lca_info = linfo;
143
144 if ((rc = ctf_label_iter(fp, label_info_cb, &cb_arg)) == CTF_ERR)
145 return (rc);
146
147 if (rc != 1)
148 return (ctf_set_errno(fp, ECTF_NOLABEL));
149
150 return (0);
151 }
152