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