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 2004 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 <sys/types.h>
30 #include <string.h>
31
32 #include "symbol.h"
33
34 int
ignore_symbol(GElf_Sym * sym,const char * name)35 ignore_symbol(GElf_Sym *sym, const char *name)
36 {
37 uchar_t type = GELF_ST_TYPE(sym->st_info);
38
39 /*
40 * As an optimization, we do not output function or data object
41 * records for undefined or anonymous symbols.
42 */
43 if (sym->st_shndx == SHN_UNDEF || sym->st_name == 0)
44 return (1);
45
46 /*
47 * _START_ and _END_ are added to the symbol table by the
48 * linker, and will never have associated type information.
49 */
50 if (strcmp(name, "_START_") == 0 || strcmp(name, "_END_") == 0)
51 return (1);
52
53 /*
54 * Do not output records for absolute-valued object symbols
55 * that have value zero. The compiler insists on generating
56 * things like this for __fsr_init_value settings, etc.
57 */
58 if (type == STT_OBJECT && sym->st_shndx == SHN_ABS &&
59 sym->st_value == 0)
60 return (1);
61 return (0);
62 }
63