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 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include <ctf_impl.h>
30
31 static int
extract_label_info(ctf_file_t * fp,const ctf_lblent_t ** ctl,uint_t * num_labels)32 extract_label_info(ctf_file_t *fp, const ctf_lblent_t **ctl, uint_t *num_labels)
33 {
34 const ctf_header_t *h;
35
36 /*
37 * Labels are only supported in V2 or later
38 */
39 if (fp->ctf_version < CTF_VERSION_2)
40 return (ctf_set_errno(fp, ECTF_NOTSUP));
41
42 h = (const ctf_header_t *)fp->ctf_data.cts_data;
43
44 /* LINTED - pointer alignment */
45 *ctl = (const ctf_lblent_t *)(fp->ctf_buf + h->cth_lbloff);
46 *num_labels = (h->cth_objtoff - h->cth_lbloff) / sizeof (ctf_lblent_t);
47
48 return (0);
49 }
50
51 /*
52 * Returns the topmost label, or NULL if any errors are encountered
53 */
54 const char *
ctf_label_topmost(ctf_file_t * fp)55 ctf_label_topmost(ctf_file_t *fp)
56 {
57 const ctf_lblent_t *ctlp;
58 const char *s;
59 uint_t num_labels;
60
61 if (extract_label_info(fp, &ctlp, &num_labels) == CTF_ERR)
62 return (NULL); /* errno is set */
63
64 if (num_labels == 0) {
65 (void) ctf_set_errno(fp, ECTF_NOLABELDATA);
66 return (NULL);
67 }
68
69 if ((s = ctf_strraw(fp, (ctlp + num_labels - 1)->ctl_label)) == NULL)
70 (void) ctf_set_errno(fp, ECTF_CORRUPT);
71
72 return (s);
73 }
74
75 /*
76 * Iterate over all labels. We pass the label string and the lblinfo_t struct
77 * to the specified callback function.
78 */
79 int
ctf_label_iter(ctf_file_t * fp,ctf_label_f * func,void * arg)80 ctf_label_iter(ctf_file_t *fp, ctf_label_f *func, void *arg)
81 {
82 const ctf_lblent_t *ctlp;
83 uint_t i, num_labels;
84 ctf_lblinfo_t linfo;
85 const char *lname;
86 int rc;
87
88 if (extract_label_info(fp, &ctlp, &num_labels) == CTF_ERR)
89 return (CTF_ERR); /* errno is set */
90
91 if (num_labels == 0)
92 return (ctf_set_errno(fp, ECTF_NOLABELDATA));
93
94 for (i = 0; i < num_labels; i++, ctlp++) {
95 if ((lname = ctf_strraw(fp, ctlp->ctl_label)) == NULL) {
96 ctf_dprintf("failed to decode label %u with "
97 "typeidx %u\n", ctlp->ctl_label, ctlp->ctl_typeidx);
98 return (ctf_set_errno(fp, ECTF_CORRUPT));
99 }
100
101 linfo.ctb_typeidx = ctlp->ctl_typeidx;
102 if ((rc = func(lname, &linfo, arg)) != 0)
103 return (rc);
104 }
105
106 return (0);
107 }
108
109 typedef struct linfo_cb_arg {
110 const char *lca_name; /* Label we want to retrieve info for */
111 ctf_lblinfo_t *lca_info; /* Where to store the info about the label */
112 } linfo_cb_arg_t;
113
114 static int
label_info_cb(const char * lname,const ctf_lblinfo_t * linfo,void * arg)115 label_info_cb(const char *lname, const ctf_lblinfo_t *linfo, void *arg)
116 {
117 /*
118 * If lname matches the label we are looking for, copy the
119 * lblinfo_t struct for the caller.
120 */
121 if (strcmp(lname, ((linfo_cb_arg_t *)arg)->lca_name) == 0) {
122 /*
123 * Allow caller not to allocate storage to test if label exists
124 */
125 if (((linfo_cb_arg_t *)arg)->lca_info != NULL)
126 bcopy(linfo, ((linfo_cb_arg_t *)arg)->lca_info,
127 sizeof (ctf_lblinfo_t));
128 return (1); /* Indicate we found a match */
129 }
130
131 return (0);
132 }
133
134 /*
135 * Retrieve information about the label with name "lname"
136 */
137 int
ctf_label_info(ctf_file_t * fp,const char * lname,ctf_lblinfo_t * linfo)138 ctf_label_info(ctf_file_t *fp, const char *lname, ctf_lblinfo_t *linfo)
139 {
140 linfo_cb_arg_t cb_arg;
141 int rc;
142
143 cb_arg.lca_name = lname;
144 cb_arg.lca_info = linfo;
145
146 if ((rc = ctf_label_iter(fp, label_info_cb, &cb_arg)) == CTF_ERR)
147 return (rc);
148
149 if (rc != 1)
150 return (ctf_set_errno(fp, ECTF_NOLABEL));
151
152 return (0);
153 }
154