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#include <string.h>
27#include <gelf.h>
28#include <decl.h>
29#include <msg.h>
30
31/*
32 * Return number of entries in the program header array, taking
33 * extended headers into account.
34 *
35 * elf_getphnum() was defined based on the definition of the earlier
36 * elf_getshnum(). It returns 0 for failure, and 1 for success.
37 *
38 * elf_getphdrnum() supercedes elf_getphnum(), which is now considered
39 * obsolete. It returns -1 for failure and 0 for success, matching
40 * elf_getshdrnum(), and bringing us into alignment with the interface
41 * agreed to in the 2002 gABI meeting.
42 *
43 * See the comment in getshnum.c for additional information.
44 */
45
46int
47elf_getphdrnum(Elf *elf, size_t *phnum)
48{
49	GElf_Ehdr	ehdr;
50	Elf_Scn		*scn;
51	GElf_Shdr	shdr0;
52
53	if (gelf_getehdr(elf, &ehdr) == NULL)
54		return (-1);
55
56	if (ehdr.e_phnum != PN_XNUM) {
57		*phnum = ehdr.e_phnum;
58		return (0);
59	}
60
61	if ((scn = elf_getscn(elf, 0)) == NULL ||
62	    gelf_getshdr(scn, &shdr0) == NULL)
63		return (-1);
64
65	if (shdr0.sh_info == 0)
66		*phnum = ehdr.e_phnum;
67	else
68		*phnum = shdr0.sh_info;
69
70	return (0);
71}
72
73int
74elf_getphnum(Elf *elf, size_t *phnum)
75{
76	return (elf_getphdrnum(elf, phnum) == 0);
77}
78