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 #include <sys/types.h>
28 #include <string.h>
29
30 #include "symbol.h"
31
32 int
ignore_symbol(GElf_Sym * sym,const char * name)33 ignore_symbol(GElf_Sym *sym, const char *name)
34 {
35 uchar_t type = GELF_ST_TYPE(sym->st_info);
36
37 /*
38 * As an optimization, we do not output function or data object
39 * records for undefined or anonymous symbols.
40 */
41 if (sym->st_shndx == SHN_UNDEF || sym->st_name == 0)
42 return (1);
43
44 /*
45 * _START_ and _END_ are added to the symbol table by the
46 * linker, and will never have associated type information.
47 */
48 if (strcmp(name, "_START_") == 0 || strcmp(name, "_END_") == 0)
49 return (1);
50
51 /*
52 * Do not output records for absolute-valued object symbols
53 * that have value zero. The compiler insists on generating
54 * things like this for __fsr_init_value settings, etc.
55 */
56 if (type == STT_OBJECT && sym->st_shndx == SHN_ABS &&
57 sym->st_value == 0)
58 return (1);
59 return (0);
60 }
61