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 <stdio.h>
30#include <string.h>
31#include <libelf.h>
32#include <gelf.h>
33
34#include <findfp.h>
35#include <util.h>
36
37int
38findelfsym(Elf *elf, uintptr_t addr, char **symnamep, offset_t *offp)
39{
40	Elf_Data *symtab;
41	GElf_Shdr shdr;
42	Elf_Scn *scn;
43	int symtabidx, nent, i;
44
45	if ((symtabidx = findelfsecidx(elf, ".symtab")) < 0)
46		elfdie("failed to find .symtab\n");
47
48	if ((scn = elf_getscn(elf, symtabidx)) == NULL ||
49	    gelf_getshdr(scn, &shdr) == NULL ||
50	    (symtab = elf_getdata(scn, NULL)) == NULL)
51		elfdie("failed to read .symtab");
52
53	nent = shdr.sh_size / shdr.sh_entsize;
54
55	for (i = 0; i < nent; i++) {
56		GElf_Sym sym;
57
58		if (gelf_getsym(symtab, i, &sym) == NULL)
59			elfdie("failed to get symbol at idx %d", i);
60
61		if ((GELF_ST_TYPE(sym.st_info) != STT_FUNC &&
62		    GELF_ST_TYPE(sym.st_info) != STT_OBJECT) ||
63		    sym.st_shndx == SHN_UNDEF)
64			continue;
65
66		if (addr - sym.st_value < sym.st_size) {
67			/* matched */
68			if ((*symnamep = elf_strptr(elf, shdr.sh_link,
69			    sym.st_name)) == NULL)
70				elfdie("failed to get name for sym %d", i);
71			*offp = addr - sym.st_value;
72			return (1);
73		}
74	}
75
76	return (0);
77}
78