libelf/common/newscn.c

	newscn.c revision 7257d1b4d25bfac0c802847390e98a464fd787ac
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */

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

#include "libelf.h"
#include "decl.h"
#include "msg.h"


Elf_Scn *
elf_newscn(Elf * elf)
{
    Elf_Scn *   tl;

    if (elf == 0)
        return (0);

    ELFWLOCK(elf)
    /*
     * if no sections yet, the file either isn't cooked
     * or it truly is empty.  Then allocate shdr[0]
     */
    if ((elf->ed_hdscn == 0) && (_elf_cook(elf) != OK_YES)) {
        ELFUNLOCK(elf)
        return (0);
    }
    if (elf->ed_ehdr == 0) {
        _elf_seterr(ESEQ_EHDR, 0);
        ELFUNLOCK(elf)
        return (0);
    }

    if (elf->ed_class == ELFCLASS32) {
        Snode32 *s;

        if (elf->ed_hdscn == 0) {
            if ((s = _elf32_snode()) == 0) {
                ELFUNLOCK(elf)
                return (0);
            }
            NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*s))
            s->sb_scn.s_elf = elf;
            elf->ed_hdscn = elf->ed_tlscn = &s->sb_scn;
            s->sb_scn.s_uflags |= ELF_F_DIRTY;
        }
        if ((s = _elf32_snode()) == 0) {
            ELFUNLOCK(elf)
            return (0);
        }
        NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*s))
        tl = elf->ed_tlscn;
        s->sb_scn.s_elf = elf;
        s->sb_scn.s_index = tl->s_index + 1;
        elf->ed_tlscn = tl->s_next = &s->sb_scn;
        ((Elf32_Ehdr *)elf->ed_ehdr)->e_shnum
            /* LINTED */
            = (Elf32_Half)(tl->s_index + 2);
        s->sb_scn.s_uflags |= ELF_F_DIRTY;
        tl = &s->sb_scn;
        NOTE(NOW_VISIBLE_TO_OTHER_THREADS(*s))
        ELFUNLOCK(elf)
        return (tl);
    } else if (elf->ed_class == ELFCLASS64) {
        Snode64 *s;

        if (elf->ed_hdscn == 0) {
            if ((s = _elf64_snode()) == 0) {
                ELFUNLOCK(elf)
                return (0);
            }
            NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*s))
            s->sb_scn.s_elf = elf;
            elf->ed_hdscn = elf->ed_tlscn = &s->sb_scn;
            s->sb_scn.s_uflags |= ELF_F_DIRTY;
        }
        if ((s = _elf64_snode()) == 0) {
            ELFUNLOCK(elf)
            return (0);
        }
        NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*s))
        tl = elf->ed_tlscn;
        s->sb_scn.s_elf = elf;
        s->sb_scn.s_index = tl->s_index + 1;
        elf->ed_tlscn = tl->s_next = &s->sb_scn;
        ((Elf64_Ehdr *)elf->ed_ehdr)->e_shnum
            /* LINTED */
            = (Elf64_Half)(tl->s_index + 2);
        s->sb_scn.s_uflags |= ELF_F_DIRTY;
        tl = &s->sb_scn;
        NOTE(NOW_VISIBLE_TO_OTHER_THREADS(*s))
        ELFUNLOCK(elf)
        return (tl);
    } else {
        _elf_seterr(EREQ_CLASS, 0);
        ELFUNLOCK(elf)
        return (0);
    }
}