bfd/simple.c

   1 /* simple.c -- BFD simple client routines
   2    Copyright 2002
   3    Free Software Foundation, Inc.
   4    Contributed by MontaVista Software, Inc.
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25 #include "bfdlink.h"
  26
  27 static boolean simple_dummy_warning
  28   PARAMS ((struct bfd_link_info * ATTRIBUTE_UNUSED,
  29            const char * ATTRIBUTE_UNUSED, const char * ATTRIBUTE_UNUSED,
  30            bfd * ATTRIBUTE_UNUSED, asection * ATTRIBUTE_UNUSED,
  31            bfd_vma ATTRIBUTE_UNUSED));
  32
  33 static boolean simple_dummy_undefined_symbol
  34   PARAMS ((struct bfd_link_info * ATTRIBUTE_UNUSED,
  35            const char * ATTRIBUTE_UNUSED, bfd * ATTRIBUTE_UNUSED,
  36            asection * ATTRIBUTE_UNUSED, bfd_vma ATTRIBUTE_UNUSED,
  37            boolean ATTRIBUTE_UNUSED));
  38
  39 static boolean simple_dummy_reloc_overflow
  40   PARAMS ((struct bfd_link_info * ATTRIBUTE_UNUSED,
  41            const char * ATTRIBUTE_UNUSED, const char * ATTRIBUTE_UNUSED,
  42            bfd_vma ATTRIBUTE_UNUSED, bfd * ATTRIBUTE_UNUSED,
  43            asection * ATTRIBUTE_UNUSED, bfd_vma ATTRIBUTE_UNUSED));
  44
  45 static boolean simple_dummy_reloc_dangerous
  46   PARAMS ((struct bfd_link_info * ATTRIBUTE_UNUSED,
  47            const char * ATTRIBUTE_UNUSED, bfd * ATTRIBUTE_UNUSED,
  48            asection * ATTRIBUTE_UNUSED, bfd_vma ATTRIBUTE_UNUSED));
  49
  50 static boolean simple_dummy_unattached_reloc
  51   PARAMS ((struct bfd_link_info * ATTRIBUTE_UNUSED,
  52            const char * ATTRIBUTE_UNUSED, bfd * ATTRIBUTE_UNUSED,
  53            asection * ATTRIBUTE_UNUSED, bfd_vma ATTRIBUTE_UNUSED));
  54
  55 bfd_byte * bfd_simple_get_relocated_section_contents
  56   PARAMS ((bfd *, asection *, bfd_byte *));
  57
  58 static boolean
  59 simple_dummy_warning (link_info, warning, symbol, abfd, section, address)
  60      struct bfd_link_info *link_info;
  61      const char *warning;
  62      const char *symbol;
  63      bfd *abfd;
  64      asection *section;
  65      bfd_vma address;
  66 {
  67   return true;
  68 }
  69
  70 static boolean
  71 simple_dummy_undefined_symbol (link_info, name, abfd, section, address, fatal)
  72      struct bfd_link_info *link_info;
  73      const char *name;
  74      bfd *abfd;
  75      asection *section;
  76      bfd_vma address;
  77      boolean fatal;
  78 {
  79   return true;
  80 }
  81
  82 static boolean
  83 simple_dummy_reloc_overflow (link_info, name, reloc_name, addend, abfd,
  84                              section, address)
  85      struct bfd_link_info *link_info;
  86      const char *name;
  87      const char *reloc_name;
  88      bfd_vma addend;
  89      bfd *abfd;
  90      asection *section;
  91      bfd_vma address;
  92 {
  93   return true;
  94 }
  95
  96 static boolean
  97 simple_dummy_reloc_dangerous (link_info, message, abfd, section, address)
  98      struct bfd_link_info *link_info;
  99      const char *message;
 100      bfd *abfd;
 101      asection *section;
 102      bfd_vma address;
 103 {
 104   return true;
 105 }
 106
 107 static boolean
 108 simple_dummy_unattached_reloc (link_info, name, abfd, section, address)
 109      struct bfd_link_info *link_info;
 110      const char *name;
 111      bfd *abfd;
 112      asection *section;
 113      bfd_vma address;
 114 {
 115   return true;
 116 }
 117
 118 /*
 119 FUNCTION
 120         bfd_simple_relocate_secton
 121
 122 SYNOPSIS
 123         bfd_byte *bfd_simple_get_relocated_section_contents (bfd *abfd, asection *sec, bfd_byte *outbuf);
 124
 125 DESCRIPTION
 126         Returns the relocated contents of section @var{sec}.  Only symbols
 127         from @var{abfd} and the output offsets assigned to sections in
 128         @var{abfd} are used.  The result will be stored at @var{outbuf}
 129         or allocated with @code{bfd_malloc} if @var{outbuf} is @code{NULL}.
 130
 131         Generally all sections in @var{abfd} should have their
 132         @code{output_section} pointing back to the original section.
 133
 134         Returns @code{NULL} on a fatal error; ignores errors applying
 135         particular relocations.
 136 */
 137
 138 bfd_byte *
 139 bfd_simple_get_relocated_section_contents (abfd, sec, outbuf)
 140      bfd *abfd;
 141      asection *sec;
 142      bfd_byte *outbuf;
 143 {
 144   struct bfd_link_info link_info;
 145   struct bfd_link_order link_order;
 146   struct bfd_link_callbacks callbacks;
 147   bfd_byte *contents, *data;
 148   int storage_needed, number_of_symbols;
 149   asymbol **symbol_table;
 150
 151   /* In order to use bfd_get_relocated_section_contents, we need
 152      to forge some data structures that it expects.  */
 153
 154   /* Fill in the bare minimum number of fields for our purposes.  */
 155   memset (&link_info, 0, sizeof (link_info));
 156   link_info.input_bfds = abfd;
 157
 158   link_info.hash = bfd_link_hash_table_create (abfd);
 159   link_info.callbacks = &callbacks;
 160   callbacks.warning = simple_dummy_warning;
 161   callbacks.undefined_symbol = simple_dummy_undefined_symbol;
 162   callbacks.reloc_overflow = simple_dummy_reloc_overflow;
 163   callbacks.reloc_dangerous = simple_dummy_reloc_dangerous;
 164   callbacks.unattached_reloc = simple_dummy_unattached_reloc;
 165
 166   memset (&link_order, 0, sizeof (link_order));
 167   link_order.next = NULL;
 168   link_order.type = bfd_indirect_link_order;
 169   link_order.offset = 0;
 170   link_order.size = bfd_section_size (abfd, sec);
 171   link_order.u.indirect.section = sec;
 172
 173   data = NULL;
 174   if (outbuf == NULL)
 175     {
 176       data = bfd_malloc (bfd_section_size (abfd, sec));
 177       if (data == NULL)
 178         return NULL;
 179       outbuf = data;
 180     }
 181   bfd_link_add_symbols (abfd, &link_info);
 182
 183   storage_needed = bfd_get_symtab_upper_bound (abfd);
 184   symbol_table = (asymbol **) bfd_malloc (storage_needed);
 185   number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
 186
 187   contents = bfd_get_relocated_section_contents (abfd,
 188                                                  &link_info,
 189                                                  &link_order,
 190                                                  outbuf,
 191                                                  0,
 192                                                  symbol_table);
 193   if (contents == NULL && data != NULL)
 194     free (data);
 195
 196   /* Foul hack to prevent bfd_section_size aborts.  This flag only controls
 197      that macro (and the related size macros), selecting between _raw_size
 198      and _cooked_size.  Debug sections won't change size while we're only
 199      relocating.  There may be trouble here someday if it tries to run
 200      relaxation unexpectedly, so make sure.  */
 201   BFD_ASSERT (sec->_raw_size == sec->_cooked_size);
 202   sec->reloc_done = 0;
 203
 204   bfd_link_hash_table_free (abfd, link_info.hash);
 205
 206   return contents;
 207 }