usr/src/cmd/sgs/libelf/common/newscn.c

   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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #include "libelf.h"
  31 #include "decl.h"
  32 #include "msg.h"
  33
  34
  35 Elf_Scn *
  36 elf_newscn(Elf * elf)
  37 {
  38         Elf_Scn *       tl;
  39
  40         if (elf == 0)
  41                 return (0);
  42
  43         ELFWLOCK(elf)
  44         /*
  45          * if no sections yet, the file either isn't cooked
  46          * or it truly is empty.  Then allocate shdr[0]
  47          */
  48         if ((elf->ed_hdscn == 0) && (_elf_cook(elf) != OK_YES)) {
  49                 ELFUNLOCK(elf)
  50                 return (0);
  51         }
  52         if (elf->ed_ehdr == 0) {
  53                 _elf_seterr(ESEQ_EHDR, 0);
  54                 ELFUNLOCK(elf)
  55                 return (0);
  56         }
  57
  58         if (elf->ed_class == ELFCLASS32) {
  59                 Snode32 *s;
  60
  61                 if (elf->ed_hdscn == 0) {
  62                         if ((s = _elf32_snode()) == 0) {
  63                                 ELFUNLOCK(elf)
  64                                 return (0);
  65                         }
  66                         s->sb_scn.s_elf = elf;
  67                         elf->ed_hdscn = elf->ed_tlscn = &s->sb_scn;
  68                         s->sb_scn.s_uflags |= ELF_F_DIRTY;
  69                 }
  70                 if ((s = _elf32_snode()) == 0) {
  71                         ELFUNLOCK(elf)
  72                         return (0);
  73                 }
  74                 tl = elf->ed_tlscn;
  75                 s->sb_scn.s_elf = elf;
  76                 s->sb_scn.s_index = tl->s_index + 1;
  77                 elf->ed_tlscn = tl->s_next = &s->sb_scn;
  78                 ((Elf32_Ehdr *)elf->ed_ehdr)->e_shnum
  79                     /* LINTED */
  80                     = (Elf32_Half)(tl->s_index + 2);
  81                 s->sb_scn.s_uflags |= ELF_F_DIRTY;
  82                 tl = &s->sb_scn;
  83                 ELFUNLOCK(elf)
  84                 return (tl);
  85         } else if (elf->ed_class == ELFCLASS64) {
  86                 Snode64 *s;
  87
  88                 if (elf->ed_hdscn == 0) {
  89                         if ((s = _elf64_snode()) == 0) {
  90                                 ELFUNLOCK(elf)
  91                                 return (0);
  92                         }
  93                         s->sb_scn.s_elf = elf;
  94                         elf->ed_hdscn = elf->ed_tlscn = &s->sb_scn;
  95                         s->sb_scn.s_uflags |= ELF_F_DIRTY;
  96                 }
  97                 if ((s = _elf64_snode()) == 0) {
  98                         ELFUNLOCK(elf)
  99                         return (0);
 100                 }
 101                 tl = elf->ed_tlscn;
 102                 s->sb_scn.s_elf = elf;
 103                 s->sb_scn.s_index = tl->s_index + 1;
 104                 elf->ed_tlscn = tl->s_next = &s->sb_scn;
 105                 ((Elf64_Ehdr *)elf->ed_ehdr)->e_shnum
 106                     /* LINTED */
 107                     = (Elf64_Half)(tl->s_index + 2);
 108                 s->sb_scn.s_uflags |= ELF_F_DIRTY;
 109                 tl = &s->sb_scn;
 110                 ELFUNLOCK(elf)
 111                 return (tl);
 112         } else {
 113                 _elf_seterr(EREQ_CLASS, 0);
 114                 ELFUNLOCK(elf)
 115                 return (0);
 116         }
 117 }