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