1/* simple.c -- BFD simple client routines 2 Copyright 2002, 2003, 2004 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 27static bfd_boolean 28simple_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 38static bfd_boolean 39simple_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 bfd_boolean fatal ATTRIBUTE_UNUSED) 45{ 46 return TRUE; 47} 48 49static bfd_boolean 50simple_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 61static bfd_boolean 62simple_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 71static bfd_boolean 72simple_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 81struct saved_output_info 82{ 83 bfd_vma offset; 84 asection *section; 85}; 86 87static void 88simple_save_output_info (bfd *abfd ATTRIBUTE_UNUSED, 89 asection *section, 90 void *ptr) 91{ 92 struct saved_output_info *output_info = ptr; 93 output_info[section->index].offset = section->output_offset; 94 output_info[section->index].section = section->output_section; 95 if ((section->flags & SEC_DEBUGGING) != 0 96 || section->output_section == NULL) 97 { 98 section->output_offset = 0; 99 section->output_section = section; 100 } 101} 102 103static void 104simple_restore_output_info (bfd *abfd ATTRIBUTE_UNUSED, 105 asection *section, 106 void *ptr) 107{ 108 struct saved_output_info *output_info = ptr; 109 section->output_offset = output_info[section->index].offset; 110 section->output_section = output_info[section->index].section; 111} 112 113/* 114FUNCTION 115 bfd_simple_relocate_secton 116 117SYNOPSIS 118 bfd_byte *bfd_simple_get_relocated_section_contents 119 (bfd *abfd, asection *sec, bfd_byte *outbuf, asymbol **symbol_table); 120 121DESCRIPTION 122 Returns the relocated contents of section @var{sec}. The symbols in 123 @var{symbol_table} will be used, or the symbols from @var{abfd} if 124 @var{symbol_table} is NULL. The output offsets for debug sections will 125 be temporarily reset to 0. The result will be stored at @var{outbuf} 126 or allocated with @code{bfd_malloc} if @var{outbuf} is @code{NULL}. 127 128 Returns @code{NULL} on a fatal error; ignores errors applying 129 particular relocations. 130*/ 131 132bfd_byte * 133bfd_simple_get_relocated_section_contents (bfd *abfd, 134 asection *sec, 135 bfd_byte *outbuf, 136 asymbol **symbol_table) 137{ 138 struct bfd_link_info link_info; 139 struct bfd_link_order link_order; 140 struct bfd_link_callbacks callbacks; 141 bfd_byte *contents, *data; 142 int storage_needed; 143 void *saved_offsets; 144 145 if (! (sec->flags & SEC_RELOC)) 146 { 147 bfd_size_type amt = sec->rawsize > sec->size ? sec->rawsize : sec->size; 148 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; 149 150 if (outbuf == NULL) 151 contents = bfd_malloc (amt); 152 else 153 contents = outbuf; 154 155 if (contents) 156 bfd_get_section_contents (abfd, sec, contents, 0, size); 157 158 return contents; 159 } 160 161 /* In order to use bfd_get_relocated_section_contents, we need 162 to forge some data structures that it expects. */ 163 164 /* Fill in the bare minimum number of fields for our purposes. */ 165 memset (&link_info, 0, sizeof (link_info)); 166 link_info.input_bfds = abfd; 167 168 link_info.hash = _bfd_generic_link_hash_table_create (abfd); 169 link_info.callbacks = &callbacks; 170 callbacks.warning = simple_dummy_warning; 171 callbacks.undefined_symbol = simple_dummy_undefined_symbol; 172 callbacks.reloc_overflow = simple_dummy_reloc_overflow; 173 callbacks.reloc_dangerous = simple_dummy_reloc_dangerous; 174 callbacks.unattached_reloc = simple_dummy_unattached_reloc; 175 176 memset (&link_order, 0, sizeof (link_order)); 177 link_order.next = NULL; 178 link_order.type = bfd_indirect_link_order; 179 link_order.offset = 0; 180 link_order.size = sec->size; 181 link_order.u.indirect.section = sec; 182 183 data = NULL; 184 if (outbuf == NULL) 185 { 186 data = bfd_malloc (sec->size); 187 if (data == NULL) 188 return NULL; 189 outbuf = data; 190 } 191 192 /* The sections in ABFD may already have output sections and offsets set. 193 Because this function is primarily for debug sections, and GCC uses the 194 knowledge that debug sections will generally have VMA 0 when emitting 195 relocations between DWARF-2 sections (which are supposed to be 196 section-relative offsets anyway), we need to reset the output offsets 197 to zero. We also need to arrange for section->output_section->vma plus 198 section->output_offset to equal section->vma, which we do by setting 199 section->output_section to point back to section. Save the original 200 output offset and output section to restore later. */ 201 saved_offsets = malloc (sizeof (struct saved_output_info) 202 * abfd->section_count); 203 if (saved_offsets == NULL) 204 { 205 if (data) 206 free (data); 207 return NULL; 208 } 209 bfd_map_over_sections (abfd, simple_save_output_info, saved_offsets); 210 211 if (symbol_table == NULL) 212 { 213 _bfd_generic_link_add_symbols (abfd, &link_info); 214 215 storage_needed = bfd_get_symtab_upper_bound (abfd); 216 symbol_table = bfd_malloc (storage_needed); 217 bfd_canonicalize_symtab (abfd, symbol_table); 218 } 219 else 220 storage_needed = 0; 221 222 contents = bfd_get_relocated_section_contents (abfd, 223 &link_info, 224 &link_order, 225 outbuf, 226 0, 227 symbol_table); 228 if (contents == NULL && data != NULL) 229 free (data); 230 231#if 0 232 /* NOTE: cagney/2003-04-05: This free, which was introduced on 233 2003-03-31 to stop a memory leak, caused a memory corruption 234 between GDB and BFD. The problem, which is stabs specific, can 235 be identified by a bunch of failures in relocate.exp vis: 236 237 gdb.base/relocate.exp: get address of static_bar 238 239 Details of the problem can be found on the binutils@ mailing 240 list, see the discussion thread: "gdb.mi/mi-cli.exp failures". */ 241 if (storage_needed != 0) 242 free (symbol_table); 243#endif 244 245 bfd_map_over_sections (abfd, simple_restore_output_info, saved_offsets); 246 free (saved_offsets); 247 248 _bfd_generic_link_hash_table_free (link_info.hash); 249 250 return contents; 251} 252