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  1. /* simple.c -- BFD simple client routines
  2.    Copyright 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
  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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  21.    MA 02110-1301, USA.  */
  22.  
  23. #include "sysdep.h"
  24. #include "bfd.h"
  25. #include "libbfd.h"
  26. #include "bfdlink.h"
  27.  
  28. static bfd_boolean
  29. simple_dummy_warning (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
  30.                       const char *warning ATTRIBUTE_UNUSED,
  31.                       const char *symbol ATTRIBUTE_UNUSED,
  32.                       bfd *abfd ATTRIBUTE_UNUSED,
  33.                       asection *section ATTRIBUTE_UNUSED,
  34.                       bfd_vma address ATTRIBUTE_UNUSED)
  35. {
  36.   return TRUE;
  37. }
  38.  
  39. static bfd_boolean
  40. simple_dummy_undefined_symbol (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
  41.                                const char *name ATTRIBUTE_UNUSED,
  42.                                bfd *abfd ATTRIBUTE_UNUSED,
  43.                                asection *section ATTRIBUTE_UNUSED,
  44.                                bfd_vma address ATTRIBUTE_UNUSED,
  45.                                bfd_boolean fatal ATTRIBUTE_UNUSED)
  46. {
  47.   return TRUE;
  48. }
  49.  
  50. static bfd_boolean
  51. simple_dummy_reloc_overflow (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
  52.                              struct bfd_link_hash_entry *entry ATTRIBUTE_UNUSED,
  53.                              const char *name ATTRIBUTE_UNUSED,
  54.                              const char *reloc_name ATTRIBUTE_UNUSED,
  55.                              bfd_vma addend ATTRIBUTE_UNUSED,
  56.                              bfd *abfd ATTRIBUTE_UNUSED,
  57.                              asection *section ATTRIBUTE_UNUSED,
  58.                              bfd_vma address ATTRIBUTE_UNUSED)
  59. {
  60.   return TRUE;
  61. }
  62.  
  63. static bfd_boolean
  64. simple_dummy_reloc_dangerous (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
  65.                               const char *message ATTRIBUTE_UNUSED,
  66.                               bfd *abfd ATTRIBUTE_UNUSED,
  67.                               asection *section ATTRIBUTE_UNUSED,
  68.                               bfd_vma address ATTRIBUTE_UNUSED)
  69. {
  70.   return TRUE;
  71. }
  72.  
  73. static bfd_boolean
  74. simple_dummy_unattached_reloc (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
  75.                                const char *name ATTRIBUTE_UNUSED,
  76.                                bfd *abfd ATTRIBUTE_UNUSED,
  77.                                asection *section ATTRIBUTE_UNUSED,
  78.                                bfd_vma address ATTRIBUTE_UNUSED)
  79. {
  80.   return TRUE;
  81. }
  82.  
  83. static bfd_boolean
  84. simple_dummy_multiple_definition (struct bfd_link_info *link_info ATTRIBUTE_UNUSED,
  85.                                   struct bfd_link_hash_entry *h ATTRIBUTE_UNUSED,
  86.                                   bfd *nbfd ATTRIBUTE_UNUSED,
  87.                                   asection *nsec ATTRIBUTE_UNUSED,
  88.                                   bfd_vma nval ATTRIBUTE_UNUSED)
  89. {
  90.   return TRUE;
  91. }
  92.  
  93. static void
  94. simple_dummy_einfo (const char *fmt ATTRIBUTE_UNUSED, ...)
  95. {
  96. }
  97.  
  98. struct saved_output_info
  99. {
  100.   bfd_vma offset;
  101.   asection *section;
  102. };
  103.  
  104. static void
  105. simple_save_output_info (bfd *abfd ATTRIBUTE_UNUSED,
  106.                          asection *section,
  107.                          void *ptr)
  108. {
  109.   struct saved_output_info *output_info = (struct saved_output_info *) ptr;
  110.   output_info[section->index].offset = section->output_offset;
  111.   output_info[section->index].section = section->output_section;
  112.   if ((section->flags & SEC_DEBUGGING) != 0
  113.       || section->output_section == NULL)
  114.     {
  115.       section->output_offset = 0;
  116.       section->output_section = section;
  117.     }
  118. }
  119.  
  120. static void
  121. simple_restore_output_info (bfd *abfd ATTRIBUTE_UNUSED,
  122.                             asection *section,
  123.                             void *ptr)
  124. {
  125.   struct saved_output_info *output_info = (struct saved_output_info *) ptr;
  126.   section->output_offset = output_info[section->index].offset;
  127.   section->output_section = output_info[section->index].section;
  128. }
  129.  
  130. /*
  131. FUNCTION
  132.         bfd_simple_relocate_secton
  133.  
  134. SYNOPSIS
  135.         bfd_byte *bfd_simple_get_relocated_section_contents
  136.           (bfd *abfd, asection *sec, bfd_byte *outbuf, asymbol **symbol_table);
  137.  
  138. DESCRIPTION
  139.         Returns the relocated contents of section @var{sec}.  The symbols in
  140.         @var{symbol_table} will be used, or the symbols from @var{abfd} if
  141.         @var{symbol_table} is NULL.  The output offsets for debug sections will
  142.         be temporarily reset to 0.  The result will be stored at @var{outbuf}
  143.         or allocated with @code{bfd_malloc} if @var{outbuf} is @code{NULL}.
  144.  
  145.         Returns @code{NULL} on a fatal error; ignores errors applying
  146.         particular relocations.
  147. */
  148.  
  149. bfd_byte *
  150. bfd_simple_get_relocated_section_contents (bfd *abfd,
  151.                                            asection *sec,
  152.                                            bfd_byte *outbuf,
  153.                                            asymbol **symbol_table)
  154. {
  155.   struct bfd_link_info link_info;
  156.   struct bfd_link_order link_order;
  157.   struct bfd_link_callbacks callbacks;
  158.   bfd_byte *contents, *data;
  159.   int storage_needed;
  160.   void *saved_offsets;
  161.  
  162.   /* Don't apply relocation on executable and shared library.  See
  163.      PR 4756.  */
  164.   if ((abfd->flags & (HAS_RELOC | EXEC_P | DYNAMIC)) != HAS_RELOC
  165.       || ! (sec->flags & SEC_RELOC))
  166.     {
  167.       contents = outbuf;
  168.       if (!bfd_get_full_section_contents (abfd, sec, &contents))
  169.         return NULL;
  170.       return contents;
  171.     }
  172.  
  173.   /* In order to use bfd_get_relocated_section_contents, we need
  174.      to forge some data structures that it expects.  */
  175.  
  176.   /* Fill in the bare minimum number of fields for our purposes.  */
  177.   memset (&link_info, 0, sizeof (link_info));
  178.   link_info.output_bfd = abfd;
  179.   link_info.input_bfds = abfd;
  180.   link_info.input_bfds_tail = &abfd->link_next;
  181.  
  182.   link_info.hash = _bfd_generic_link_hash_table_create (abfd);
  183.   link_info.callbacks = &callbacks;
  184.   callbacks.warning = simple_dummy_warning;
  185.   callbacks.undefined_symbol = simple_dummy_undefined_symbol;
  186.   callbacks.reloc_overflow = simple_dummy_reloc_overflow;
  187.   callbacks.reloc_dangerous = simple_dummy_reloc_dangerous;
  188.   callbacks.unattached_reloc = simple_dummy_unattached_reloc;
  189.   callbacks.multiple_definition = simple_dummy_multiple_definition;
  190.   callbacks.einfo = simple_dummy_einfo;
  191.  
  192.   memset (&link_order, 0, sizeof (link_order));
  193.   link_order.next = NULL;
  194.   link_order.type = bfd_indirect_link_order;
  195.   link_order.offset = 0;
  196.   link_order.size = sec->size;
  197.   link_order.u.indirect.section = sec;
  198.  
  199.   data = NULL;
  200.   if (outbuf == NULL)
  201.     {
  202.       bfd_size_type amt = sec->rawsize > sec->size ? sec->rawsize : sec->size;
  203.       data = (bfd_byte *) bfd_malloc (amt);
  204.       if (data == NULL)
  205.         return NULL;
  206.       outbuf = data;
  207.     }
  208.  
  209.   /* The sections in ABFD may already have output sections and offsets set.
  210.      Because this function is primarily for debug sections, and GCC uses the
  211.      knowledge that debug sections will generally have VMA 0 when emitting
  212.      relocations between DWARF-2 sections (which are supposed to be
  213.      section-relative offsets anyway), we need to reset the output offsets
  214.      to zero.  We also need to arrange for section->output_section->vma plus
  215.      section->output_offset to equal section->vma, which we do by setting
  216.      section->output_section to point back to section.  Save the original
  217.      output offset and output section to restore later.  */
  218.   saved_offsets = malloc (sizeof (struct saved_output_info)
  219.                           * abfd->section_count);
  220.   if (saved_offsets == NULL)
  221.     {
  222.       if (data)
  223.         free (data);
  224.       return NULL;
  225.     }
  226.   bfd_map_over_sections (abfd, simple_save_output_info, saved_offsets);
  227.  
  228.   if (symbol_table == NULL)
  229.     {
  230.       _bfd_generic_link_add_symbols (abfd, &link_info);
  231.  
  232.       storage_needed = bfd_get_symtab_upper_bound (abfd);
  233.       symbol_table = (asymbol **) bfd_malloc (storage_needed);
  234.       bfd_canonicalize_symtab (abfd, symbol_table);
  235.     }
  236.   else
  237.     storage_needed = 0;
  238.  
  239.   contents = bfd_get_relocated_section_contents (abfd,
  240.                                                  &link_info,
  241.                                                  &link_order,
  242.                                                  outbuf,
  243.                                                  0,
  244.                                                  symbol_table);
  245.   if (contents == NULL && data != NULL)
  246.     free (data);
  247.  
  248.   bfd_map_over_sections (abfd, simple_restore_output_info, saved_offsets);
  249.   free (saved_offsets);
  250.  
  251.   _bfd_generic_link_hash_table_free (link_info.hash);
  252.   return contents;
  253. }
  254.