findfp/common/findsym.c

	findsym.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <stdio.h>
#include <string.h>
#include <libelf.h>
#include <gelf.h>

#include <findfp.h>
#include <util.h>

int
findelfsym(Elf *elf, uintptr_t addr, char **symnamep, offset_t *offp)
{
    Elf_Data *symtab;
    GElf_Shdr shdr;
    Elf_Scn *scn;
    int symtabidx, nent, i;

    if ((symtabidx = findelfsecidx(elf, ".symtab")) < 0)
        elfdie("failed to find .symtab\n");

    if ((scn = elf_getscn(elf, symtabidx)) == NULL ||
        gelf_getshdr(scn, &shdr) == NULL ||
        (symtab = elf_getdata(scn, NULL)) == NULL)
        elfdie("failed to read .symtab");

    nent = shdr.sh_size / shdr.sh_entsize;

    for (i = 0; i < nent; i++) {
        GElf_Sym sym;

        if (gelf_getsym(symtab, i, &sym) == NULL)
            elfdie("failed to get symbol at idx %d", i);

        if ((GELF_ST_TYPE(sym.st_info) != STT_FUNC &&
            GELF_ST_TYPE(sym.st_info) != STT_OBJECT) ||
            sym.st_shndx == SHN_UNDEF)
            continue;

        if (addr - sym.st_value < sym.st_size) {
            /* matched */
            if ((*symnamep = elf_strptr(elf, shdr.sh_link,
                sym.st_name)) == NULL)
                elfdie("failed to get name for sym %d", i);
            *offp = addr - sym.st_value;
            return (1);
        }
    }

    return (0);
}