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       && seclet->size)
  85   {
  86     data = bfd_get_relocated_section_contents(abfd, seclet, data);
  87     if(bfd_set_section_contents(abfd,
  88                                 output_section,
  89                                 data,
  90                                 seclet->offset,
  91                                 seclet->size) == false)
  92     {
  93       abort();
  94     }
  95   }
  96 }
  97
  98 void
  99 DEFUN(seclet_dump_seclet,(abfd, seclet, section, data),
 100       bfd *abfd AND
 101       bfd_seclet_type *seclet AND
 102       asection *section AND
 103       PTR data)
 104 {
 105   switch (seclet->type)
 106   {
 107    case bfd_indirect_seclet:
 108     /* The contents of this section come from another one somewhere
 109        else */
 110     rel(abfd, seclet, section, data);
 111     break;
 112    case bfd_fill_seclet:
 113     /* Fill in the section with us */
 114    {
 115      char *d = malloc(seclet->size);
 116      unsigned int i;
 117      for (i =0;  i < seclet->size; i+=2) {
 118        d[i] = seclet->u.fill.value >> 8;
 119      }
 120      for (i = 1; i < seclet->size; i+=2) {
 121        d[i] = seclet->u.fill.value ;
 122      }
 123      bfd_set_section_contents(abfd, section, d, seclet->offset, seclet->size);
 124
 125    }
 126     break;
 127    default:
 128     abort();
 129   }
 130 }
 131
 132 void
 133 DEFUN(seclet_dump,(abfd, data),
 134       bfd *abfd AND
 135       PTR data)
 136 {
 137   /* Write all the seclets on the bfd out, relocate etc according to the
 138      rules */
 139
 140   asection *o = abfd->sections;
 141   while (o != (asection *)NULL)
 142   {
 143     bfd_seclet_type *p = o->seclets_head;
 144     while (p != (bfd_seclet_type *)NULL)
 145     {
 146       seclet_dump_seclet(abfd, p, o, data);
 147       p = p ->next;
 148     }
 149     o = o->next;
 150   }
 151 }