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
46 int
elf_getphdrnum(Elf * elf,size_t * phnum)47 elf_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
73 int
elf_getphnum(Elf * elf,size_t * phnum)74 elf_getphnum(Elf *elf, size_t *phnum)
75 {
76 return (elf_getphdrnum(elf, phnum) == 0);
77 }
78