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 *, const char *, const char *, bfd *,
  29            asection *, bfd_vma));
  30
  31 static boolean simple_dummy_undefined_symbol
  32   PARAMS ((struct bfd_link_info *, const char *, bfd *, asection *,
  33            bfd_vma, boolean));
  34
  35 static boolean simple_dummy_reloc_overflow
  36   PARAMS ((struct bfd_link_info *, const char *, const char *, bfd_vma,
  37            bfd *, asection *, bfd_vma));
  38
  39 static boolean simple_dummy_reloc_dangerous
  40   PARAMS ((struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma));
  41
  42 static boolean simple_dummy_unattached_reloc
  43   PARAMS ((struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma));
  44
  45 bfd_byte * bfd_simple_get_relocated_section_contents
  46   PARAMS ((bfd *, asection *, bfd_byte *));
  47
  48 static boolean
  49 simple_dummy_warning (link_info, warning, symbol, abfd, section, address)
  50      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
  51      const char *warning ATTRIBUTE_UNUSED;
  52      const char *symbol ATTRIBUTE_UNUSED;
  53      bfd *abfd ATTRIBUTE_UNUSED;
  54      asection *section ATTRIBUTE_UNUSED;
  55      bfd_vma address ATTRIBUTE_UNUSED;
  56 {
  57   return true;
  58 }
  59
  60 static boolean
  61 simple_dummy_undefined_symbol (link_info, name, abfd, section, address, fatal)
  62      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
  63      const char *name ATTRIBUTE_UNUSED;
  64      bfd *abfd ATTRIBUTE_UNUSED;
  65      asection *section ATTRIBUTE_UNUSED;
  66      bfd_vma address ATTRIBUTE_UNUSED;
  67      boolean fatal ATTRIBUTE_UNUSED;
  68 {
  69   return true;
  70 }
  71
  72 static boolean
  73 simple_dummy_reloc_overflow (link_info, name, reloc_name, addend, abfd,
  74                              section, address)
  75      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
  76      const char *name ATTRIBUTE_UNUSED;
  77      const char *reloc_name ATTRIBUTE_UNUSED;
  78      bfd_vma addend ATTRIBUTE_UNUSED;
  79      bfd *abfd ATTRIBUTE_UNUSED;
  80      asection *section ATTRIBUTE_UNUSED;
  81      bfd_vma address ATTRIBUTE_UNUSED;
  82 {
  83   return true;
  84 }
  85
  86 static boolean
  87 simple_dummy_reloc_dangerous (link_info, message, abfd, section, address)
  88      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
  89      const char *message ATTRIBUTE_UNUSED;
  90      bfd *abfd ATTRIBUTE_UNUSED;
  91      asection *section ATTRIBUTE_UNUSED;
  92      bfd_vma address ATTRIBUTE_UNUSED;
  93 {
  94   return true;
  95 }
  96
  97 static boolean
  98 simple_dummy_unattached_reloc (link_info, name, abfd, section, address)
  99      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
 100      const char *name ATTRIBUTE_UNUSED;
 101      bfd *abfd ATTRIBUTE_UNUSED;
 102      asection *section ATTRIBUTE_UNUSED;
 103      bfd_vma address ATTRIBUTE_UNUSED;
 104 {
 105   return true;
 106 }
 107
 108 /*
 109 FUNCTION
 110         bfd_simple_relocate_secton
 111
 112 SYNOPSIS
 113         bfd_byte *bfd_simple_get_relocated_section_contents (bfd *abfd, asection *sec, bfd_byte *outbuf);
 114
 115 DESCRIPTION
 116         Returns the relocated contents of section @var{sec}.  Only symbols
 117         from @var{abfd} and the output offsets assigned to sections in
 118         @var{abfd} are used.  The result will be stored at @var{outbuf}
 119         or allocated with @code{bfd_malloc} if @var{outbuf} is @code{NULL}.
 120
 121         Generally all sections in @var{abfd} should have their
 122         @code{output_section} pointing back to the original section.
 123
 124         Returns @code{NULL} on a fatal error; ignores errors applying
 125         particular relocations.
 126 */
 127
 128 bfd_byte *
 129 bfd_simple_get_relocated_section_contents (abfd, sec, outbuf)
 130      bfd *abfd;
 131      asection *sec;
 132      bfd_byte *outbuf;
 133 {
 134   struct bfd_link_info link_info;
 135   struct bfd_link_order link_order;
 136   struct bfd_link_callbacks callbacks;
 137   bfd_byte *contents, *data;
 138   int storage_needed, number_of_symbols;
 139   asymbol **symbol_table;
 140
 141   if (! (sec->flags & SEC_RELOC))
 142     {
 143       bfd_size_type size = bfd_section_size (abfd, sec);
 144
 145       if (outbuf == NULL)
 146         contents = bfd_malloc (size);
 147       else
 148         contents = outbuf;
 149
 150       if (contents)
 151         bfd_get_section_contents (abfd, sec, contents, 0, size);
 152
 153       return contents;
 154     }
 155
 156   /* In order to use bfd_get_relocated_section_contents, we need
 157      to forge some data structures that it expects.  */
 158
 159   /* Fill in the bare minimum number of fields for our purposes.  */
 160   memset (&link_info, 0, sizeof (link_info));
 161   link_info.input_bfds = abfd;
 162
 163   link_info.hash = bfd_link_hash_table_create (abfd);
 164   link_info.callbacks = &callbacks;
 165   callbacks.warning = simple_dummy_warning;
 166   callbacks.undefined_symbol = simple_dummy_undefined_symbol;
 167   callbacks.reloc_overflow = simple_dummy_reloc_overflow;
 168   callbacks.reloc_dangerous = simple_dummy_reloc_dangerous;
 169   callbacks.unattached_reloc = simple_dummy_unattached_reloc;
 170
 171   memset (&link_order, 0, sizeof (link_order));
 172   link_order.next = NULL;
 173   link_order.type = bfd_indirect_link_order;
 174   link_order.offset = 0;
 175   link_order.size = bfd_section_size (abfd, sec);
 176   link_order.u.indirect.section = sec;
 177
 178   data = NULL;
 179   if (outbuf == NULL)
 180     {
 181       data = bfd_malloc (bfd_section_size (abfd, sec));
 182       if (data == NULL)
 183         return NULL;
 184       outbuf = data;
 185     }
 186   bfd_link_add_symbols (abfd, &link_info);
 187
 188   storage_needed = bfd_get_symtab_upper_bound (abfd);
 189   symbol_table = (asymbol **) bfd_malloc (storage_needed);
 190   number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
 191
 192   contents = bfd_get_relocated_section_contents (abfd,
 193                                                  &link_info,
 194                                                  &link_order,
 195                                                  outbuf,
 196                                                  0,
 197                                                  symbol_table);
 198   if (contents == NULL && data != NULL)
 199     free (data);
 200
 201   /* Foul hack to prevent bfd_section_size aborts.  This flag only controls
 202      that macro (and the related size macros), selecting between _raw_size
 203      and _cooked_size.  Debug sections won't change size while we're only
 204      relocating.  There may be trouble here someday if it tries to run
 205      relaxation unexpectedly, so make sure.  */
 206   BFD_ASSERT (sec->_raw_size == sec->_cooked_size);
 207   sec->reloc_done = 0;
 208
 209   bfd_link_hash_table_free (abfd, link_info.hash);
 210
 211   return contents;
 212 }