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 bfd_seclet_type *
  50 DEFUN(bfd_new_seclet,(abfd, section),
  51       bfd *abfd AND
  52       asection *section)
  53 {
  54   bfd_seclet_type *n = (bfd_seclet_type *)bfd_alloc(abfd, sizeof(bfd_seclet_type));
  55   if (section->seclets_tail != (bfd_seclet_type *)NULL) {
  56       section->seclets_tail->next = n;
  57     }
  58   else
  59   {
  60     section->seclets_head = n;
  61   }
  62   section->seclets_tail = n;
  63
  64   return n;
  65 }
  66
  67
  68
  69
  70 #define MAX_ERRORS_IN_A_ROW 10
  71 extern bfd_error_vector_type bfd_error_vector;
  72
  73
  74 void
  75 DEFUN(rel,(abfd, seclet, output_section, data),
  76       bfd *abfd AND
  77       bfd_seclet_type *seclet AND
  78       asection *output_section AND
  79       PTR data)
  80 {
  81
  82   if (output_section->flags & SEC_HAS_CONTENTS
  83       && !(output_section->flags & SEC_NEVER_LOAD)
  84       && (output_section->flags & SEC_LOAD)
  85       && seclet->size)
  86   {
  87     data = (PTR) bfd_get_relocated_section_contents(abfd, seclet, data);
  88     if(bfd_set_section_contents(abfd,
  89                                 output_section,
  90                                 data,
  91                                 seclet->offset,
  92                                 seclet->size) == false)
  93     {
  94       abort();
  95     }
  96   }
  97 }
  98
  99 void
 100 DEFUN(seclet_dump_seclet,(abfd, seclet, section, data),
 101       bfd *abfd AND
 102       bfd_seclet_type *seclet AND
 103       asection *section AND
 104       PTR data)
 105 {
 106   switch (seclet->type)
 107   {
 108    case bfd_indirect_seclet:
 109     /* The contents of this section come from another one somewhere
 110        else */
 111     rel(abfd, seclet, section, data);
 112     break;
 113    case bfd_fill_seclet:
 114     /* Fill in the section with us */
 115    {
 116      char *d = malloc(seclet->size);
 117      unsigned int i;
 118      for (i =0;  i < seclet->size; i+=2) {
 119        d[i] = seclet->u.fill.value >> 8;
 120      }
 121      for (i = 1; i < seclet->size; i+=2) {
 122        d[i] = seclet->u.fill.value ;
 123      }
 124      bfd_set_section_contents(abfd, section, d, seclet->offset, seclet->size);
 125
 126    }
 127     break;
 128    default:
 129     abort();
 130   }
 131 }
 132
 133 void
 134 DEFUN(seclet_dump,(abfd, data),
 135       bfd *abfd AND
 136       PTR data)
 137 {
 138   /* Write all the seclets on the bfd out, relocate etc according to the
 139      rules */
 140
 141   asection *o = abfd->sections;
 142   while (o != (asection *)NULL)
 143   {
 144     bfd_seclet_type *p = o->seclets_head;
 145     while (p != (bfd_seclet_type *)NULL)
 146     {
 147       seclet_dump_seclet(abfd, p, o, data);
 148       p = p ->next;
 149     }
 150     o = o->next;
 151   }
 152 }