| 1 | /* simple.c -- BFD simple client routines |
| 2 | Copyright 2002, 2003, 2004, 2005, 2007 |
| 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 | const char *name ATTRIBUTE_UNUSED, |
| 86 | bfd *obfd ATTRIBUTE_UNUSED, |
| 87 | asection *osec ATTRIBUTE_UNUSED, |
| 88 | bfd_vma oval ATTRIBUTE_UNUSED, |
| 89 | bfd *nbfd ATTRIBUTE_UNUSED, |
| 90 | asection *nsec ATTRIBUTE_UNUSED, |
| 91 | bfd_vma nval ATTRIBUTE_UNUSED) |
| 92 | { |
| 93 | return TRUE; |
| 94 | } |
| 95 | |
| 96 | static void |
| 97 | simple_dummy_einfo (const char *fmt ATTRIBUTE_UNUSED, ...) |
| 98 | { |
| 99 | } |
| 100 | |
| 101 | struct saved_output_info |
| 102 | { |
| 103 | bfd_vma offset; |
| 104 | asection *section; |
| 105 | }; |
| 106 | |
| 107 | static void |
| 108 | simple_save_output_info (bfd *abfd ATTRIBUTE_UNUSED, |
| 109 | asection *section, |
| 110 | void *ptr) |
| 111 | { |
| 112 | struct saved_output_info *output_info = ptr; |
| 113 | output_info[section->index].offset = section->output_offset; |
| 114 | output_info[section->index].section = section->output_section; |
| 115 | if ((section->flags & SEC_DEBUGGING) != 0 |
| 116 | || section->output_section == NULL) |
| 117 | { |
| 118 | section->output_offset = 0; |
| 119 | section->output_section = section; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | static void |
| 124 | simple_restore_output_info (bfd *abfd ATTRIBUTE_UNUSED, |
| 125 | asection *section, |
| 126 | void *ptr) |
| 127 | { |
| 128 | struct saved_output_info *output_info = ptr; |
| 129 | section->output_offset = output_info[section->index].offset; |
| 130 | section->output_section = output_info[section->index].section; |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | FUNCTION |
| 135 | bfd_simple_relocate_secton |
| 136 | |
| 137 | SYNOPSIS |
| 138 | bfd_byte *bfd_simple_get_relocated_section_contents |
| 139 | (bfd *abfd, asection *sec, bfd_byte *outbuf, asymbol **symbol_table); |
| 140 | |
| 141 | DESCRIPTION |
| 142 | Returns the relocated contents of section @var{sec}. The symbols in |
| 143 | @var{symbol_table} will be used, or the symbols from @var{abfd} if |
| 144 | @var{symbol_table} is NULL. The output offsets for debug sections will |
| 145 | be temporarily reset to 0. The result will be stored at @var{outbuf} |
| 146 | or allocated with @code{bfd_malloc} if @var{outbuf} is @code{NULL}. |
| 147 | |
| 148 | Returns @code{NULL} on a fatal error; ignores errors applying |
| 149 | particular relocations. |
| 150 | */ |
| 151 | |
| 152 | bfd_byte * |
| 153 | bfd_simple_get_relocated_section_contents (bfd *abfd, |
| 154 | asection *sec, |
| 155 | bfd_byte *outbuf, |
| 156 | asymbol **symbol_table) |
| 157 | { |
| 158 | struct bfd_link_info link_info; |
| 159 | struct bfd_link_order link_order; |
| 160 | struct bfd_link_callbacks callbacks; |
| 161 | bfd_byte *contents, *data; |
| 162 | int storage_needed; |
| 163 | void *saved_offsets; |
| 164 | |
| 165 | /* Don't apply relocation on executable and shared library. See |
| 166 | PR 4756. */ |
| 167 | if ((abfd->flags & (HAS_RELOC | EXEC_P | DYNAMIC)) != HAS_RELOC |
| 168 | || ! (sec->flags & SEC_RELOC)) |
| 169 | { |
| 170 | bfd_size_type amt = sec->rawsize > sec->size ? sec->rawsize : sec->size; |
| 171 | bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; |
| 172 | |
| 173 | if (outbuf == NULL) |
| 174 | contents = bfd_malloc (amt); |
| 175 | else |
| 176 | contents = outbuf; |
| 177 | |
| 178 | if (contents) |
| 179 | bfd_get_section_contents (abfd, sec, contents, 0, size); |
| 180 | |
| 181 | return contents; |
| 182 | } |
| 183 | |
| 184 | /* In order to use bfd_get_relocated_section_contents, we need |
| 185 | to forge some data structures that it expects. */ |
| 186 | |
| 187 | /* Fill in the bare minimum number of fields for our purposes. */ |
| 188 | memset (&link_info, 0, sizeof (link_info)); |
| 189 | link_info.input_bfds = abfd; |
| 190 | link_info.input_bfds_tail = &abfd->link_next; |
| 191 | |
| 192 | link_info.hash = _bfd_generic_link_hash_table_create (abfd); |
| 193 | link_info.callbacks = &callbacks; |
| 194 | callbacks.warning = simple_dummy_warning; |
| 195 | callbacks.undefined_symbol = simple_dummy_undefined_symbol; |
| 196 | callbacks.reloc_overflow = simple_dummy_reloc_overflow; |
| 197 | callbacks.reloc_dangerous = simple_dummy_reloc_dangerous; |
| 198 | callbacks.unattached_reloc = simple_dummy_unattached_reloc; |
| 199 | callbacks.multiple_definition = simple_dummy_multiple_definition; |
| 200 | callbacks.einfo = simple_dummy_einfo; |
| 201 | |
| 202 | memset (&link_order, 0, sizeof (link_order)); |
| 203 | link_order.next = NULL; |
| 204 | link_order.type = bfd_indirect_link_order; |
| 205 | link_order.offset = 0; |
| 206 | link_order.size = sec->size; |
| 207 | link_order.u.indirect.section = sec; |
| 208 | |
| 209 | data = NULL; |
| 210 | if (outbuf == NULL) |
| 211 | { |
| 212 | data = bfd_malloc (sec->size); |
| 213 | if (data == NULL) |
| 214 | return NULL; |
| 215 | outbuf = data; |
| 216 | } |
| 217 | |
| 218 | /* The sections in ABFD may already have output sections and offsets set. |
| 219 | Because this function is primarily for debug sections, and GCC uses the |
| 220 | knowledge that debug sections will generally have VMA 0 when emitting |
| 221 | relocations between DWARF-2 sections (which are supposed to be |
| 222 | section-relative offsets anyway), we need to reset the output offsets |
| 223 | to zero. We also need to arrange for section->output_section->vma plus |
| 224 | section->output_offset to equal section->vma, which we do by setting |
| 225 | section->output_section to point back to section. Save the original |
| 226 | output offset and output section to restore later. */ |
| 227 | saved_offsets = malloc (sizeof (struct saved_output_info) |
| 228 | * abfd->section_count); |
| 229 | if (saved_offsets == NULL) |
| 230 | { |
| 231 | if (data) |
| 232 | free (data); |
| 233 | return NULL; |
| 234 | } |
| 235 | bfd_map_over_sections (abfd, simple_save_output_info, saved_offsets); |
| 236 | |
| 237 | if (symbol_table == NULL) |
| 238 | { |
| 239 | _bfd_generic_link_add_symbols (abfd, &link_info); |
| 240 | |
| 241 | storage_needed = bfd_get_symtab_upper_bound (abfd); |
| 242 | symbol_table = bfd_malloc (storage_needed); |
| 243 | bfd_canonicalize_symtab (abfd, symbol_table); |
| 244 | } |
| 245 | else |
| 246 | storage_needed = 0; |
| 247 | |
| 248 | contents = bfd_get_relocated_section_contents (abfd, |
| 249 | &link_info, |
| 250 | &link_order, |
| 251 | outbuf, |
| 252 | 0, |
| 253 | symbol_table); |
| 254 | if (contents == NULL && data != NULL) |
| 255 | free (data); |
| 256 | |
| 257 | bfd_map_over_sections (abfd, simple_restore_output_info, saved_offsets); |
| 258 | free (saved_offsets); |
| 259 | |
| 260 | _bfd_generic_link_hash_table_free (link_info.hash); |
| 261 | return contents; |
| 262 | } |