bfd/seclet.c

   1 /* seclet.c
   2    Copyright (C) 1992 Free Software Foundation, Inc.
   3    Written by Cygnus Support.
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* This module is part of BFD */
  22
  23
  24 /* The intention is that one day, all the code which uses sections
  25    will change and use seclets instead - maybe seglet would have been
  26    a better name..
  27
  28    Anyway, a seclet contains enough info to be able to describe an
  29    area of output memory in one go.
  30
  31    The only description so far catered for is that of the
  32    <<bfd_indirect_seclet>>, which is a select which points to a
  33    <<section>> and the <<asymbols>> associated with the section, so
  34    that relocation can be done when needed.
  35
  36    One day there will be more types - they will at least migrate from
  37    the linker's data structures - also there could be extra stuff,
  38    like a bss seclet, which descibes a lump of memory as containing
  39    zeros compactly, without the horrible SEC_* flag cruft.
  40
  41
  42 */
  43
  44 #include "bfd.h"
  45 #include "sysdep.h"
  46 #include "libbfd.h"
  47 #include "seclet.h"
  48 #include "coff/internal.h"
  49
  50 /* Create a new seclet and attach it to a section.  */
  51
  52 bfd_seclet_type *
  53 DEFUN(bfd_new_seclet,(abfd, section),
  54       bfd *abfd AND
  55       asection *section)
  56 {
  57   bfd_seclet_type *n = (bfd_seclet_type *)bfd_alloc(abfd, sizeof(bfd_seclet_type));
  58   if (section->seclets_tail != (bfd_seclet_type *)NULL) {
  59       section->seclets_tail->next = n;
  60     }
  61   else
  62   {
  63     section->seclets_head = n;
  64   }
  65   section->seclets_tail = n;
  66
  67   return n;
  68 }
  69
  70 /* Given an indirect seclet which points to an input section, relocate
  71    the contents of the seclet and put the data in its final
  72    destination.  */
  73
  74 static boolean
  75 DEFUN(rel,(abfd, seclet, output_section, data, relocateable),
  76       bfd *abfd AND
  77       bfd_seclet_type *seclet AND
  78       asection *output_section AND
  79       PTR data AND
  80       boolean relocateable)
  81 {
  82
  83   if (output_section->flags & SEC_HAS_CONTENTS
  84       && !(output_section->flags & SEC_NEVER_LOAD)
  85       && (output_section->flags & SEC_LOAD)
  86       && seclet->size)
  87   {
  88     data = (PTR) bfd_get_relocated_section_contents(abfd, seclet, data,
  89                                                     relocateable);
  90     if(bfd_set_section_contents(abfd,
  91                                 output_section,
  92                                 data,
  93                                 seclet->offset,
  94                                 seclet->size) == false)
  95     {
  96       abort();
  97     }
  98   }
  99   return true;
 100 }
 101
 102 /* Put the contents of a seclet in its final destination.  */
 103
 104 static boolean
 105 DEFUN(seclet_dump_seclet,(abfd, seclet, section, data, relocateable),
 106       bfd *abfd AND
 107       bfd_seclet_type *seclet AND
 108       asection *section AND
 109       PTR data AND
 110       boolean relocateable)
 111 {
 112   switch (seclet->type)
 113     {
 114     case bfd_indirect_seclet:
 115       /* The contents of this section come from another one somewhere
 116          else */
 117       return rel(abfd, seclet, section, data, relocateable);
 118
 119     case bfd_fill_seclet:
 120       /* Fill in the section with us */
 121       {
 122         char *d = bfd_xmalloc(seclet->size);
 123         unsigned int i;
 124         for (i =0;  i < seclet->size; i+=2) {
 125           d[i] = seclet->u.fill.value >> 8;
 126         }
 127         for (i = 1; i < seclet->size; i+=2) {
 128           d[i] = seclet->u.fill.value ;
 129         }
 130         return bfd_set_section_contents(abfd, section, d, seclet->offset,
 131                                         seclet->size);
 132       }
 133
 134     default:
 135       abort();
 136     }
 137
 138   return true;
 139 }
 140
 141 /*
 142 INTERNAL_FUNCTION
 143         bfd_generic_seclet_link
 144
 145 SYNOPSIS
 146         boolean bfd_generic_seclet_link
 147          (bfd *abfd,
 148           PTR data,
 149           boolean relocateable);
 150
 151 DESCRIPTION
 152
 153         The generic seclet linking routine.  The caller should have
 154         set up seclets for all the output sections.  The DATA argument
 155         should point to a memory area large enough to hold the largest
 156         section.  This function looks through the seclets and moves
 157         the contents into the output sections.  If RELOCATEABLE is
 158         true, the orelocation fields of the output sections must
 159         already be initialized.
 160
 161 */
 162
 163 boolean
 164 DEFUN(bfd_generic_seclet_link,(abfd, data, relocateable),
 165       bfd *abfd AND
 166       PTR data AND
 167       boolean relocateable)
 168 {
 169   asection *o = abfd->sections;
 170   while (o != (asection *)NULL)
 171   {
 172     bfd_seclet_type *p = o->seclets_head;
 173     while (p != (bfd_seclet_type *)NULL)
 174     {
 175       if (seclet_dump_seclet(abfd, p, o, data, relocateable) == false)
 176         return false;
 177       p = p ->next;
 178     }
 179     o = o->next;
 180   }
 181
 182   return true;
 183 }