aboutsummaryrefslogtreecommitdiff
path: root/common/ctf/ctf_labels.c
blob: ddcb1d330202d6bf016d9e47af7f505e2955ed7b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2002-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <ctf_impl.h>

static int
extract_label_info(ctf_file_t *fp, const ctf_lblent_t **ctl, uint_t *num_labels)
{
	const ctf_header_t *h;

	/*
	 * Labels are only supported in V2 or later
	 */
	if (fp->ctf_version < CTF_VERSION_2)
		return (ctf_set_errno(fp, ECTF_NOTSUP));

	h = (const ctf_header_t *)fp->ctf_data.cts_data;

	/* LINTED - pointer alignment */
	*ctl = (const ctf_lblent_t *)(fp->ctf_buf + h->cth_lbloff);
	*num_labels = (h->cth_objtoff - h->cth_lbloff) / sizeof (ctf_lblent_t);

	return (0);
}

/*
 * Returns the topmost label, or NULL if any errors are encountered
 */
const char *
ctf_label_topmost(ctf_file_t *fp)
{
	const ctf_lblent_t *ctlp;
	const char *s;
	uint_t num_labels;

	if (extract_label_info(fp, &ctlp, &num_labels) == CTF_ERR)
		return (NULL); /* errno is set */

	if (num_labels == 0) {
		(void) ctf_set_errno(fp, ECTF_NOLABELDATA);
		return (NULL);
	}

	if ((s = ctf_strraw(fp, (ctlp + num_labels - 1)->ctl_label)) == NULL)
		(void) ctf_set_errno(fp, ECTF_CORRUPT);

	return (s);
}

/*
 * Iterate over all labels.  We pass the label string and the lblinfo_t struct
 * to the specified callback function.
 */
int
ctf_label_iter(ctf_file_t *fp, ctf_label_f *func, void *arg)
{
	const ctf_lblent_t *ctlp;
	uint_t i, num_labels;
	ctf_lblinfo_t linfo;
	const char *lname;
	int rc;

	if (extract_label_info(fp, &ctlp, &num_labels) == CTF_ERR)
		return (CTF_ERR); /* errno is set */

	if (num_labels == 0)
		return (ctf_set_errno(fp, ECTF_NOLABELDATA));

	for (i = 0; i < num_labels; i++, ctlp++) {
		if ((lname = ctf_strraw(fp, ctlp->ctl_label)) == NULL) {
			ctf_dprintf("failed to decode label %u with "
			    "typeidx %u\n", ctlp->ctl_label, ctlp->ctl_typeidx);
			return (ctf_set_errno(fp, ECTF_CORRUPT));
		}

		linfo.ctb_typeidx = ctlp->ctl_typeidx;
		if ((rc = func(lname, &linfo, arg)) != 0)
			return (rc);
	}

	return (0);
}

typedef struct linfo_cb_arg {
	const char *lca_name;    /* Label we want to retrieve info for */
	ctf_lblinfo_t *lca_info; /* Where to store the info about the label */
} linfo_cb_arg_t;

static int
label_info_cb(const char *lname, const ctf_lblinfo_t *linfo, void *arg)
{
	/*
	 * If lname matches the label we are looking for, copy the
	 * lblinfo_t struct for the caller.
	 */
	if (strcmp(lname, ((linfo_cb_arg_t *)arg)->lca_name) == 0) {
		/*
		 * Allow caller not to allocate storage to test if label exists
		 */
		if (((linfo_cb_arg_t *)arg)->lca_info != NULL)
			bcopy(linfo, ((linfo_cb_arg_t *)arg)->lca_info,
			    sizeof (ctf_lblinfo_t));
		return (1); /* Indicate we found a match */
	}

	return (0);
}

/*
 * Retrieve information about the label with name "lname"
 */
int
ctf_label_info(ctf_file_t *fp, const char *lname, ctf_lblinfo_t *linfo)
{
	linfo_cb_arg_t cb_arg;
	int rc;

	cb_arg.lca_name = lname;
	cb_arg.lca_info = linfo;

	if ((rc = ctf_label_iter(fp, label_info_cb, &cb_arg)) == CTF_ERR)
		return (rc);

	if (rc != 1)
		return (ctf_set_errno(fp, ECTF_NOLABEL));

	return (0);
}