| 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 | } |