1 /* simple.c -- BFD simple client routines 2 Copyright 2002, 2003, 2004, 2005, 2007, 2008, 2009 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 = (struct saved_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 = (struct saved_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_byte *) 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.output_bfd = abfd; 190 link_info.input_bfds = abfd; 191 link_info.input_bfds_tail = &abfd->link_next; 192 193 link_info.hash = _bfd_generic_link_hash_table_create (abfd); 194 link_info.callbacks = &callbacks; 195 callbacks.warning = simple_dummy_warning; 196 callbacks.undefined_symbol = simple_dummy_undefined_symbol; 197 callbacks.reloc_overflow = simple_dummy_reloc_overflow; 198 callbacks.reloc_dangerous = simple_dummy_reloc_dangerous; 199 callbacks.unattached_reloc = simple_dummy_unattached_reloc; 200 callbacks.multiple_definition = simple_dummy_multiple_definition; 201 callbacks.einfo = simple_dummy_einfo; 202 203 memset (&link_order, 0, sizeof (link_order)); 204 link_order.next = NULL; 205 link_order.type = bfd_indirect_link_order; 206 link_order.offset = 0; 207 link_order.size = sec->size; 208 link_order.u.indirect.section = sec; 209 210 data = NULL; 211 if (outbuf == NULL) 212 { 213 bfd_size_type amt = sec->rawsize > sec->size ? sec->rawsize : sec->size; 214 data = (bfd_byte *) bfd_malloc (amt); 215 if (data == NULL) 216 return NULL; 217 outbuf = data; 218 } 219 220 /* The sections in ABFD may already have output sections and offsets set. 221 Because this function is primarily for debug sections, and GCC uses the 222 knowledge that debug sections will generally have VMA 0 when emitting 223 relocations between DWARF-2 sections (which are supposed to be 224 section-relative offsets anyway), we need to reset the output offsets 225 to zero. We also need to arrange for section->output_section->vma plus 226 section->output_offset to equal section->vma, which we do by setting 227 section->output_section to point back to section. Save the original 228 output offset and output section to restore later. */ 229 saved_offsets = malloc (sizeof (struct saved_output_info) 230 * abfd->section_count); 231 if (saved_offsets == NULL) 232 { 233 if (data) 234 free (data); 235 return NULL; 236 } 237 bfd_map_over_sections (abfd, simple_save_output_info, saved_offsets); 238 239 if (symbol_table == NULL) 240 { 241 _bfd_generic_link_add_symbols (abfd, &link_info); 242 243 storage_needed = bfd_get_symtab_upper_bound (abfd); 244 symbol_table = (asymbol **) bfd_malloc (storage_needed); 245 bfd_canonicalize_symtab (abfd, symbol_table); 246 } 247 else 248 storage_needed = 0; 249 250 contents = bfd_get_relocated_section_contents (abfd, 251 &link_info, 252 &link_order, 253 outbuf, 254 0, 255 symbol_table); 256 if (contents == NULL && data != NULL) 257 free (data); 258 259 bfd_map_over_sections (abfd, simple_restore_output_info, saved_offsets); 260 free (saved_offsets); 261 262 _bfd_generic_link_hash_table_free (link_info.hash); 263 return contents; 264 } 265