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 contents = outbuf; 171 if (!bfd_get_full_section_contents (abfd, sec, &contents)) 172 return NULL; 173 return contents; 174 } 175 176 /* In order to use bfd_get_relocated_section_contents, we need 177 to forge some data structures that it expects. */ 178 179 /* Fill in the bare minimum number of fields for our purposes. */ 180 memset (&link_info, 0, sizeof (link_info)); 181 link_info.output_bfd = abfd; 182 link_info.input_bfds = abfd; 183 link_info.input_bfds_tail = &abfd->link_next; 184 185 link_info.hash = _bfd_generic_link_hash_table_create (abfd); 186 link_info.callbacks = &callbacks; 187 callbacks.warning = simple_dummy_warning; 188 callbacks.undefined_symbol = simple_dummy_undefined_symbol; 189 callbacks.reloc_overflow = simple_dummy_reloc_overflow; 190 callbacks.reloc_dangerous = simple_dummy_reloc_dangerous; 191 callbacks.unattached_reloc = simple_dummy_unattached_reloc; 192 callbacks.multiple_definition = simple_dummy_multiple_definition; 193 callbacks.einfo = simple_dummy_einfo; 194 195 memset (&link_order, 0, sizeof (link_order)); 196 link_order.next = NULL; 197 link_order.type = bfd_indirect_link_order; 198 link_order.offset = 0; 199 link_order.size = sec->size; 200 link_order.u.indirect.section = sec; 201 202 data = NULL; 203 if (outbuf == NULL) 204 { 205 bfd_size_type amt = sec->rawsize > sec->size ? sec->rawsize : sec->size; 206 data = (bfd_byte *) bfd_malloc (amt); 207 if (data == NULL) 208 return NULL; 209 outbuf = data; 210 } 211 212 /* The sections in ABFD may already have output sections and offsets set. 213 Because this function is primarily for debug sections, and GCC uses the 214 knowledge that debug sections will generally have VMA 0 when emitting 215 relocations between DWARF-2 sections (which are supposed to be 216 section-relative offsets anyway), we need to reset the output offsets 217 to zero. We also need to arrange for section->output_section->vma plus 218 section->output_offset to equal section->vma, which we do by setting 219 section->output_section to point back to section. Save the original 220 output offset and output section to restore later. */ 221 saved_offsets = malloc (sizeof (struct saved_output_info) 222 * abfd->section_count); 223 if (saved_offsets == NULL) 224 { 225 if (data) 226 free (data); 227 return NULL; 228 } 229 bfd_map_over_sections (abfd, simple_save_output_info, saved_offsets); 230 231 if (symbol_table == NULL) 232 { 233 _bfd_generic_link_add_symbols (abfd, &link_info); 234 235 storage_needed = bfd_get_symtab_upper_bound (abfd); 236 symbol_table = (asymbol **) bfd_malloc (storage_needed); 237 bfd_canonicalize_symtab (abfd, symbol_table); 238 } 239 else 240 storage_needed = 0; 241 242 contents = bfd_get_relocated_section_contents (abfd, 243 &link_info, 244 &link_order, 245 outbuf, 246 0, 247 symbol_table); 248 if (contents == NULL && data != NULL) 249 free (data); 250 251 bfd_map_over_sections (abfd, simple_restore_output_info, saved_offsets); 252 free (saved_offsets); 253 254 _bfd_generic_link_hash_table_free (link_info.hash); 255 return contents; 256 } 257