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/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"@(#)getscn.c	1.11	08/05/31 SMI"
31
32#include "libelf.h"
33#include "decl.h"
34#include "msg.h"
35
36
37Elf_Scn *
38elf_getscn(Elf * elf, size_t index)
39{
40	Elf_Scn	*	s;
41	Elf_Scn	*	prev_s;
42	size_t		j = index;
43	size_t		tabsz;
44
45	if (elf == 0)
46		return (0);
47
48	ELFRLOCK(elf)
49	tabsz = elf->ed_scntabsz;
50	if (elf->ed_hdscn == 0) {
51		ELFUNLOCK(elf)
52		ELFWLOCK(elf)
53		if ((elf->ed_hdscn == 0) && (_elf_cook(elf) != OK_YES)) {
54			ELFUNLOCK(elf);
55			return (0);
56		}
57		ELFUNLOCK(elf);
58		ELFRLOCK(elf)
59	}
60	/*
61	 * If the section in question is part of a table allocated
62	 * from within _elf_prescn() then we can index straight
63	 * to it.
64	 */
65	if (index < tabsz) {
66		s = &elf->ed_hdscn[index];
67		ELFUNLOCK(elf);
68		return (s);
69	}
70
71#ifndef	__lock_lint
72	if (tabsz)
73		s = &elf->ed_hdscn[tabsz - 1];
74	else
75		s = elf->ed_hdscn;
76
77	for (prev_s = 0; s != 0; prev_s = s, s = s->s_next) {
78		if (prev_s) {
79			SCNUNLOCK(prev_s)
80		}
81		SCNLOCK(s)
82		if (j == 0) {
83			if (s->s_index == index) {
84				SCNUNLOCK(s)
85				ELFUNLOCK(elf);
86				return (s);
87			}
88			_elf_seterr(EBUG_SCNLIST, 0);
89			SCNUNLOCK(s)
90			ELFUNLOCK(elf)
91			return (0);
92		}
93		--j;
94	}
95	if (prev_s) {
96		SCNUNLOCK(prev_s)
97	}
98#endif
99	_elf_seterr(EREQ_NDX, 0);
100	ELFUNLOCK(elf);
101	return (0);
102}
103