| 1 | /* linker.c -- BFD linker routines |
| 2 | Copyright (C) 1993-2019 Free Software Foundation, Inc. |
| 3 | Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "bfdlink.h" |
| 26 | #include "genlink.h" |
| 27 | |
| 28 | /* |
| 29 | SECTION |
| 30 | Linker Functions |
| 31 | |
| 32 | @cindex Linker |
| 33 | The linker uses three special entry points in the BFD target |
| 34 | vector. It is not necessary to write special routines for |
| 35 | these entry points when creating a new BFD back end, since |
| 36 | generic versions are provided. However, writing them can |
| 37 | speed up linking and make it use significantly less runtime |
| 38 | memory. |
| 39 | |
| 40 | The first routine creates a hash table used by the other |
| 41 | routines. The second routine adds the symbols from an object |
| 42 | file to the hash table. The third routine takes all the |
| 43 | object files and links them together to create the output |
| 44 | file. These routines are designed so that the linker proper |
| 45 | does not need to know anything about the symbols in the object |
| 46 | files that it is linking. The linker merely arranges the |
| 47 | sections as directed by the linker script and lets BFD handle |
| 48 | the details of symbols and relocs. |
| 49 | |
| 50 | The second routine and third routines are passed a pointer to |
| 51 | a <<struct bfd_link_info>> structure (defined in |
| 52 | <<bfdlink.h>>) which holds information relevant to the link, |
| 53 | including the linker hash table (which was created by the |
| 54 | first routine) and a set of callback functions to the linker |
| 55 | proper. |
| 56 | |
| 57 | The generic linker routines are in <<linker.c>>, and use the |
| 58 | header file <<genlink.h>>. As of this writing, the only back |
| 59 | ends which have implemented versions of these routines are |
| 60 | a.out (in <<aoutx.h>>) and ECOFF (in <<ecoff.c>>). The a.out |
| 61 | routines are used as examples throughout this section. |
| 62 | |
| 63 | @menu |
| 64 | @* Creating a Linker Hash Table:: |
| 65 | @* Adding Symbols to the Hash Table:: |
| 66 | @* Performing the Final Link:: |
| 67 | @end menu |
| 68 | |
| 69 | INODE |
| 70 | Creating a Linker Hash Table, Adding Symbols to the Hash Table, Linker Functions, Linker Functions |
| 71 | SUBSECTION |
| 72 | Creating a linker hash table |
| 73 | |
| 74 | @cindex _bfd_link_hash_table_create in target vector |
| 75 | @cindex target vector (_bfd_link_hash_table_create) |
| 76 | The linker routines must create a hash table, which must be |
| 77 | derived from <<struct bfd_link_hash_table>> described in |
| 78 | <<bfdlink.c>>. @xref{Hash Tables}, for information on how to |
| 79 | create a derived hash table. This entry point is called using |
| 80 | the target vector of the linker output file. |
| 81 | |
| 82 | The <<_bfd_link_hash_table_create>> entry point must allocate |
| 83 | and initialize an instance of the desired hash table. If the |
| 84 | back end does not require any additional information to be |
| 85 | stored with the entries in the hash table, the entry point may |
| 86 | simply create a <<struct bfd_link_hash_table>>. Most likely, |
| 87 | however, some additional information will be needed. |
| 88 | |
| 89 | For example, with each entry in the hash table the a.out |
| 90 | linker keeps the index the symbol has in the final output file |
| 91 | (this index number is used so that when doing a relocatable |
| 92 | link the symbol index used in the output file can be quickly |
| 93 | filled in when copying over a reloc). The a.out linker code |
| 94 | defines the required structures and functions for a hash table |
| 95 | derived from <<struct bfd_link_hash_table>>. The a.out linker |
| 96 | hash table is created by the function |
| 97 | <<NAME(aout,link_hash_table_create)>>; it simply allocates |
| 98 | space for the hash table, initializes it, and returns a |
| 99 | pointer to it. |
| 100 | |
| 101 | When writing the linker routines for a new back end, you will |
| 102 | generally not know exactly which fields will be required until |
| 103 | you have finished. You should simply create a new hash table |
| 104 | which defines no additional fields, and then simply add fields |
| 105 | as they become necessary. |
| 106 | |
| 107 | INODE |
| 108 | Adding Symbols to the Hash Table, Performing the Final Link, Creating a Linker Hash Table, Linker Functions |
| 109 | SUBSECTION |
| 110 | Adding symbols to the hash table |
| 111 | |
| 112 | @cindex _bfd_link_add_symbols in target vector |
| 113 | @cindex target vector (_bfd_link_add_symbols) |
| 114 | The linker proper will call the <<_bfd_link_add_symbols>> |
| 115 | entry point for each object file or archive which is to be |
| 116 | linked (typically these are the files named on the command |
| 117 | line, but some may also come from the linker script). The |
| 118 | entry point is responsible for examining the file. For an |
| 119 | object file, BFD must add any relevant symbol information to |
| 120 | the hash table. For an archive, BFD must determine which |
| 121 | elements of the archive should be used and adding them to the |
| 122 | link. |
| 123 | |
| 124 | The a.out version of this entry point is |
| 125 | <<NAME(aout,link_add_symbols)>>. |
| 126 | |
| 127 | @menu |
| 128 | @* Differing file formats:: |
| 129 | @* Adding symbols from an object file:: |
| 130 | @* Adding symbols from an archive:: |
| 131 | @end menu |
| 132 | |
| 133 | INODE |
| 134 | Differing file formats, Adding symbols from an object file, Adding Symbols to the Hash Table, Adding Symbols to the Hash Table |
| 135 | SUBSUBSECTION |
| 136 | Differing file formats |
| 137 | |
| 138 | Normally all the files involved in a link will be of the same |
| 139 | format, but it is also possible to link together different |
| 140 | format object files, and the back end must support that. The |
| 141 | <<_bfd_link_add_symbols>> entry point is called via the target |
| 142 | vector of the file to be added. This has an important |
| 143 | consequence: the function may not assume that the hash table |
| 144 | is the type created by the corresponding |
| 145 | <<_bfd_link_hash_table_create>> vector. All the |
| 146 | <<_bfd_link_add_symbols>> function can assume about the hash |
| 147 | table is that it is derived from <<struct |
| 148 | bfd_link_hash_table>>. |
| 149 | |
| 150 | Sometimes the <<_bfd_link_add_symbols>> function must store |
| 151 | some information in the hash table entry to be used by the |
| 152 | <<_bfd_final_link>> function. In such a case the output bfd |
| 153 | xvec must be checked to make sure that the hash table was |
| 154 | created by an object file of the same format. |
| 155 | |
| 156 | The <<_bfd_final_link>> routine must be prepared to handle a |
| 157 | hash entry without any extra information added by the |
| 158 | <<_bfd_link_add_symbols>> function. A hash entry without |
| 159 | extra information will also occur when the linker script |
| 160 | directs the linker to create a symbol. Note that, regardless |
| 161 | of how a hash table entry is added, all the fields will be |
| 162 | initialized to some sort of null value by the hash table entry |
| 163 | initialization function. |
| 164 | |
| 165 | See <<ecoff_link_add_externals>> for an example of how to |
| 166 | check the output bfd before saving information (in this |
| 167 | case, the ECOFF external symbol debugging information) in a |
| 168 | hash table entry. |
| 169 | |
| 170 | INODE |
| 171 | Adding symbols from an object file, Adding symbols from an archive, Differing file formats, Adding Symbols to the Hash Table |
| 172 | SUBSUBSECTION |
| 173 | Adding symbols from an object file |
| 174 | |
| 175 | When the <<_bfd_link_add_symbols>> routine is passed an object |
| 176 | file, it must add all externally visible symbols in that |
| 177 | object file to the hash table. The actual work of adding the |
| 178 | symbol to the hash table is normally handled by the function |
| 179 | <<_bfd_generic_link_add_one_symbol>>. The |
| 180 | <<_bfd_link_add_symbols>> routine is responsible for reading |
| 181 | all the symbols from the object file and passing the correct |
| 182 | information to <<_bfd_generic_link_add_one_symbol>>. |
| 183 | |
| 184 | The <<_bfd_link_add_symbols>> routine should not use |
| 185 | <<bfd_canonicalize_symtab>> to read the symbols. The point of |
| 186 | providing this routine is to avoid the overhead of converting |
| 187 | the symbols into generic <<asymbol>> structures. |
| 188 | |
| 189 | @findex _bfd_generic_link_add_one_symbol |
| 190 | <<_bfd_generic_link_add_one_symbol>> handles the details of |
| 191 | combining common symbols, warning about multiple definitions, |
| 192 | and so forth. It takes arguments which describe the symbol to |
| 193 | add, notably symbol flags, a section, and an offset. The |
| 194 | symbol flags include such things as <<BSF_WEAK>> or |
| 195 | <<BSF_INDIRECT>>. The section is a section in the object |
| 196 | file, or something like <<bfd_und_section_ptr>> for an undefined |
| 197 | symbol or <<bfd_com_section_ptr>> for a common symbol. |
| 198 | |
| 199 | If the <<_bfd_final_link>> routine is also going to need to |
| 200 | read the symbol information, the <<_bfd_link_add_symbols>> |
| 201 | routine should save it somewhere attached to the object file |
| 202 | BFD. However, the information should only be saved if the |
| 203 | <<keep_memory>> field of the <<info>> argument is TRUE, so |
| 204 | that the <<-no-keep-memory>> linker switch is effective. |
| 205 | |
| 206 | The a.out function which adds symbols from an object file is |
| 207 | <<aout_link_add_object_symbols>>, and most of the interesting |
| 208 | work is in <<aout_link_add_symbols>>. The latter saves |
| 209 | pointers to the hash tables entries created by |
| 210 | <<_bfd_generic_link_add_one_symbol>> indexed by symbol number, |
| 211 | so that the <<_bfd_final_link>> routine does not have to call |
| 212 | the hash table lookup routine to locate the entry. |
| 213 | |
| 214 | INODE |
| 215 | Adding symbols from an archive, , Adding symbols from an object file, Adding Symbols to the Hash Table |
| 216 | SUBSUBSECTION |
| 217 | Adding symbols from an archive |
| 218 | |
| 219 | When the <<_bfd_link_add_symbols>> routine is passed an |
| 220 | archive, it must look through the symbols defined by the |
| 221 | archive and decide which elements of the archive should be |
| 222 | included in the link. For each such element it must call the |
| 223 | <<add_archive_element>> linker callback, and it must add the |
| 224 | symbols from the object file to the linker hash table. (The |
| 225 | callback may in fact indicate that a replacement BFD should be |
| 226 | used, in which case the symbols from that BFD should be added |
| 227 | to the linker hash table instead.) |
| 228 | |
| 229 | @findex _bfd_generic_link_add_archive_symbols |
| 230 | In most cases the work of looking through the symbols in the |
| 231 | archive should be done by the |
| 232 | <<_bfd_generic_link_add_archive_symbols>> function. |
| 233 | <<_bfd_generic_link_add_archive_symbols>> is passed a function |
| 234 | to call to make the final decision about adding an archive |
| 235 | element to the link and to do the actual work of adding the |
| 236 | symbols to the linker hash table. If the element is to |
| 237 | be included, the <<add_archive_element>> linker callback |
| 238 | routine must be called with the element as an argument, and |
| 239 | the element's symbols must be added to the linker hash table |
| 240 | just as though the element had itself been passed to the |
| 241 | <<_bfd_link_add_symbols>> function. |
| 242 | |
| 243 | When the a.out <<_bfd_link_add_symbols>> function receives an |
| 244 | archive, it calls <<_bfd_generic_link_add_archive_symbols>> |
| 245 | passing <<aout_link_check_archive_element>> as the function |
| 246 | argument. <<aout_link_check_archive_element>> calls |
| 247 | <<aout_link_check_ar_symbols>>. If the latter decides to add |
| 248 | the element (an element is only added if it provides a real, |
| 249 | non-common, definition for a previously undefined or common |
| 250 | symbol) it calls the <<add_archive_element>> callback and then |
| 251 | <<aout_link_check_archive_element>> calls |
| 252 | <<aout_link_add_symbols>> to actually add the symbols to the |
| 253 | linker hash table - possibly those of a substitute BFD, if the |
| 254 | <<add_archive_element>> callback avails itself of that option. |
| 255 | |
| 256 | The ECOFF back end is unusual in that it does not normally |
| 257 | call <<_bfd_generic_link_add_archive_symbols>>, because ECOFF |
| 258 | archives already contain a hash table of symbols. The ECOFF |
| 259 | back end searches the archive itself to avoid the overhead of |
| 260 | creating a new hash table. |
| 261 | |
| 262 | INODE |
| 263 | Performing the Final Link, , Adding Symbols to the Hash Table, Linker Functions |
| 264 | SUBSECTION |
| 265 | Performing the final link |
| 266 | |
| 267 | @cindex _bfd_link_final_link in target vector |
| 268 | @cindex target vector (_bfd_final_link) |
| 269 | When all the input files have been processed, the linker calls |
| 270 | the <<_bfd_final_link>> entry point of the output BFD. This |
| 271 | routine is responsible for producing the final output file, |
| 272 | which has several aspects. It must relocate the contents of |
| 273 | the input sections and copy the data into the output sections. |
| 274 | It must build an output symbol table including any local |
| 275 | symbols from the input files and the global symbols from the |
| 276 | hash table. When producing relocatable output, it must |
| 277 | modify the input relocs and write them into the output file. |
| 278 | There may also be object format dependent work to be done. |
| 279 | |
| 280 | The linker will also call the <<write_object_contents>> entry |
| 281 | point when the BFD is closed. The two entry points must work |
| 282 | together in order to produce the correct output file. |
| 283 | |
| 284 | The details of how this works are inevitably dependent upon |
| 285 | the specific object file format. The a.out |
| 286 | <<_bfd_final_link>> routine is <<NAME(aout,final_link)>>. |
| 287 | |
| 288 | @menu |
| 289 | @* Information provided by the linker:: |
| 290 | @* Relocating the section contents:: |
| 291 | @* Writing the symbol table:: |
| 292 | @end menu |
| 293 | |
| 294 | INODE |
| 295 | Information provided by the linker, Relocating the section contents, Performing the Final Link, Performing the Final Link |
| 296 | SUBSUBSECTION |
| 297 | Information provided by the linker |
| 298 | |
| 299 | Before the linker calls the <<_bfd_final_link>> entry point, |
| 300 | it sets up some data structures for the function to use. |
| 301 | |
| 302 | The <<input_bfds>> field of the <<bfd_link_info>> structure |
| 303 | will point to a list of all the input files included in the |
| 304 | link. These files are linked through the <<link.next>> field |
| 305 | of the <<bfd>> structure. |
| 306 | |
| 307 | Each section in the output file will have a list of |
| 308 | <<link_order>> structures attached to the <<map_head.link_order>> |
| 309 | field (the <<link_order>> structure is defined in |
| 310 | <<bfdlink.h>>). These structures describe how to create the |
| 311 | contents of the output section in terms of the contents of |
| 312 | various input sections, fill constants, and, eventually, other |
| 313 | types of information. They also describe relocs that must be |
| 314 | created by the BFD backend, but do not correspond to any input |
| 315 | file; this is used to support -Ur, which builds constructors |
| 316 | while generating a relocatable object file. |
| 317 | |
| 318 | INODE |
| 319 | Relocating the section contents, Writing the symbol table, Information provided by the linker, Performing the Final Link |
| 320 | SUBSUBSECTION |
| 321 | Relocating the section contents |
| 322 | |
| 323 | The <<_bfd_final_link>> function should look through the |
| 324 | <<link_order>> structures attached to each section of the |
| 325 | output file. Each <<link_order>> structure should either be |
| 326 | handled specially, or it should be passed to the function |
| 327 | <<_bfd_default_link_order>> which will do the right thing |
| 328 | (<<_bfd_default_link_order>> is defined in <<linker.c>>). |
| 329 | |
| 330 | For efficiency, a <<link_order>> of type |
| 331 | <<bfd_indirect_link_order>> whose associated section belongs |
| 332 | to a BFD of the same format as the output BFD must be handled |
| 333 | specially. This type of <<link_order>> describes part of an |
| 334 | output section in terms of a section belonging to one of the |
| 335 | input files. The <<_bfd_final_link>> function should read the |
| 336 | contents of the section and any associated relocs, apply the |
| 337 | relocs to the section contents, and write out the modified |
| 338 | section contents. If performing a relocatable link, the |
| 339 | relocs themselves must also be modified and written out. |
| 340 | |
| 341 | @findex _bfd_relocate_contents |
| 342 | @findex _bfd_final_link_relocate |
| 343 | The functions <<_bfd_relocate_contents>> and |
| 344 | <<_bfd_final_link_relocate>> provide some general support for |
| 345 | performing the actual relocations, notably overflow checking. |
| 346 | Their arguments include information about the symbol the |
| 347 | relocation is against and a <<reloc_howto_type>> argument |
| 348 | which describes the relocation to perform. These functions |
| 349 | are defined in <<reloc.c>>. |
| 350 | |
| 351 | The a.out function which handles reading, relocating, and |
| 352 | writing section contents is <<aout_link_input_section>>. The |
| 353 | actual relocation is done in <<aout_link_input_section_std>> |
| 354 | and <<aout_link_input_section_ext>>. |
| 355 | |
| 356 | INODE |
| 357 | Writing the symbol table, , Relocating the section contents, Performing the Final Link |
| 358 | SUBSUBSECTION |
| 359 | Writing the symbol table |
| 360 | |
| 361 | The <<_bfd_final_link>> function must gather all the symbols |
| 362 | in the input files and write them out. It must also write out |
| 363 | all the symbols in the global hash table. This must be |
| 364 | controlled by the <<strip>> and <<discard>> fields of the |
| 365 | <<bfd_link_info>> structure. |
| 366 | |
| 367 | The local symbols of the input files will not have been |
| 368 | entered into the linker hash table. The <<_bfd_final_link>> |
| 369 | routine must consider each input file and include the symbols |
| 370 | in the output file. It may be convenient to do this when |
| 371 | looking through the <<link_order>> structures, or it may be |
| 372 | done by stepping through the <<input_bfds>> list. |
| 373 | |
| 374 | The <<_bfd_final_link>> routine must also traverse the global |
| 375 | hash table to gather all the externally visible symbols. It |
| 376 | is possible that most of the externally visible symbols may be |
| 377 | written out when considering the symbols of each input file, |
| 378 | but it is still necessary to traverse the hash table since the |
| 379 | linker script may have defined some symbols that are not in |
| 380 | any of the input files. |
| 381 | |
| 382 | The <<strip>> field of the <<bfd_link_info>> structure |
| 383 | controls which symbols are written out. The possible values |
| 384 | are listed in <<bfdlink.h>>. If the value is <<strip_some>>, |
| 385 | then the <<keep_hash>> field of the <<bfd_link_info>> |
| 386 | structure is a hash table of symbols to keep; each symbol |
| 387 | should be looked up in this hash table, and only symbols which |
| 388 | are present should be included in the output file. |
| 389 | |
| 390 | If the <<strip>> field of the <<bfd_link_info>> structure |
| 391 | permits local symbols to be written out, the <<discard>> field |
| 392 | is used to further controls which local symbols are included |
| 393 | in the output file. If the value is <<discard_l>>, then all |
| 394 | local symbols which begin with a certain prefix are discarded; |
| 395 | this is controlled by the <<bfd_is_local_label_name>> entry point. |
| 396 | |
| 397 | The a.out backend handles symbols by calling |
| 398 | <<aout_link_write_symbols>> on each input BFD and then |
| 399 | traversing the global hash table with the function |
| 400 | <<aout_link_write_other_symbol>>. It builds a string table |
| 401 | while writing out the symbols, which is written to the output |
| 402 | file at the end of <<NAME(aout,final_link)>>. |
| 403 | */ |
| 404 | |
| 405 | static bfd_boolean generic_link_add_object_symbols |
| 406 | (bfd *, struct bfd_link_info *); |
| 407 | static bfd_boolean generic_link_check_archive_element |
| 408 | (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *, const char *, |
| 409 | bfd_boolean *); |
| 410 | static bfd_boolean generic_link_add_symbol_list |
| 411 | (bfd *, struct bfd_link_info *, bfd_size_type count, asymbol **); |
| 412 | static bfd_boolean generic_add_output_symbol |
| 413 | (bfd *, size_t *psymalloc, asymbol *); |
| 414 | static bfd_boolean default_data_link_order |
| 415 | (bfd *, struct bfd_link_info *, asection *, struct bfd_link_order *); |
| 416 | static bfd_boolean default_indirect_link_order |
| 417 | (bfd *, struct bfd_link_info *, asection *, struct bfd_link_order *, |
| 418 | bfd_boolean); |
| 419 | |
| 420 | /* The link hash table structure is defined in bfdlink.h. It provides |
| 421 | a base hash table which the backend specific hash tables are built |
| 422 | upon. */ |
| 423 | |
| 424 | /* Routine to create an entry in the link hash table. */ |
| 425 | |
| 426 | struct bfd_hash_entry * |
| 427 | _bfd_link_hash_newfunc (struct bfd_hash_entry *entry, |
| 428 | struct bfd_hash_table *table, |
| 429 | const char *string) |
| 430 | { |
| 431 | /* Allocate the structure if it has not already been allocated by a |
| 432 | subclass. */ |
| 433 | if (entry == NULL) |
| 434 | { |
| 435 | entry = (struct bfd_hash_entry *) |
| 436 | bfd_hash_allocate (table, sizeof (struct bfd_link_hash_entry)); |
| 437 | if (entry == NULL) |
| 438 | return entry; |
| 439 | } |
| 440 | |
| 441 | /* Call the allocation method of the superclass. */ |
| 442 | entry = bfd_hash_newfunc (entry, table, string); |
| 443 | if (entry) |
| 444 | { |
| 445 | struct bfd_link_hash_entry *h = (struct bfd_link_hash_entry *) entry; |
| 446 | |
| 447 | /* Initialize the local fields. */ |
| 448 | memset ((char *) &h->root + sizeof (h->root), 0, |
| 449 | sizeof (*h) - sizeof (h->root)); |
| 450 | } |
| 451 | |
| 452 | return entry; |
| 453 | } |
| 454 | |
| 455 | /* Initialize a link hash table. The BFD argument is the one |
| 456 | responsible for creating this table. */ |
| 457 | |
| 458 | bfd_boolean |
| 459 | _bfd_link_hash_table_init |
| 460 | (struct bfd_link_hash_table *table, |
| 461 | bfd *abfd ATTRIBUTE_UNUSED, |
| 462 | struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *, |
| 463 | struct bfd_hash_table *, |
| 464 | const char *), |
| 465 | unsigned int entsize) |
| 466 | { |
| 467 | bfd_boolean ret; |
| 468 | |
| 469 | BFD_ASSERT (!abfd->is_linker_output && !abfd->link.hash); |
| 470 | table->undefs = NULL; |
| 471 | table->undefs_tail = NULL; |
| 472 | table->type = bfd_link_generic_hash_table; |
| 473 | |
| 474 | ret = bfd_hash_table_init (&table->table, newfunc, entsize); |
| 475 | if (ret) |
| 476 | { |
| 477 | /* Arrange for destruction of this hash table on closing ABFD. */ |
| 478 | table->hash_table_free = _bfd_generic_link_hash_table_free; |
| 479 | abfd->link.hash = table; |
| 480 | abfd->is_linker_output = TRUE; |
| 481 | } |
| 482 | return ret; |
| 483 | } |
| 484 | |
| 485 | /* Look up a symbol in a link hash table. If follow is TRUE, we |
| 486 | follow bfd_link_hash_indirect and bfd_link_hash_warning links to |
| 487 | the real symbol. |
| 488 | |
| 489 | .{* Return TRUE if the symbol described by a linker hash entry H |
| 490 | . is going to be absolute. Linker-script defined symbols can be |
| 491 | . converted from absolute to section-relative ones late in the |
| 492 | . link. Use this macro to correctly determine whether the symbol |
| 493 | . will actually end up absolute in output. *} |
| 494 | .#define bfd_is_abs_symbol(H) \ |
| 495 | . (((H)->type == bfd_link_hash_defined \ |
| 496 | . || (H)->type == bfd_link_hash_defweak) \ |
| 497 | . && bfd_is_abs_section ((H)->u.def.section) \ |
| 498 | . && !(H)->rel_from_abs) |
| 499 | . |
| 500 | */ |
| 501 | |
| 502 | struct bfd_link_hash_entry * |
| 503 | bfd_link_hash_lookup (struct bfd_link_hash_table *table, |
| 504 | const char *string, |
| 505 | bfd_boolean create, |
| 506 | bfd_boolean copy, |
| 507 | bfd_boolean follow) |
| 508 | { |
| 509 | struct bfd_link_hash_entry *ret; |
| 510 | |
| 511 | if (table == NULL || string == NULL) |
| 512 | return NULL; |
| 513 | |
| 514 | ret = ((struct bfd_link_hash_entry *) |
| 515 | bfd_hash_lookup (&table->table, string, create, copy)); |
| 516 | |
| 517 | if (follow && ret != NULL) |
| 518 | { |
| 519 | while (ret->type == bfd_link_hash_indirect |
| 520 | || ret->type == bfd_link_hash_warning) |
| 521 | ret = ret->u.i.link; |
| 522 | } |
| 523 | |
| 524 | return ret; |
| 525 | } |
| 526 | |
| 527 | /* Look up a symbol in the main linker hash table if the symbol might |
| 528 | be wrapped. This should only be used for references to an |
| 529 | undefined symbol, not for definitions of a symbol. */ |
| 530 | |
| 531 | struct bfd_link_hash_entry * |
| 532 | bfd_wrapped_link_hash_lookup (bfd *abfd, |
| 533 | struct bfd_link_info *info, |
| 534 | const char *string, |
| 535 | bfd_boolean create, |
| 536 | bfd_boolean copy, |
| 537 | bfd_boolean follow) |
| 538 | { |
| 539 | bfd_size_type amt; |
| 540 | |
| 541 | if (info->wrap_hash != NULL) |
| 542 | { |
| 543 | const char *l; |
| 544 | char prefix = '\0'; |
| 545 | |
| 546 | l = string; |
| 547 | if (*l == bfd_get_symbol_leading_char (abfd) || *l == info->wrap_char) |
| 548 | { |
| 549 | prefix = *l; |
| 550 | ++l; |
| 551 | } |
| 552 | |
| 553 | #undef WRAP |
| 554 | #define WRAP "__wrap_" |
| 555 | |
| 556 | if (bfd_hash_lookup (info->wrap_hash, l, FALSE, FALSE) != NULL) |
| 557 | { |
| 558 | char *n; |
| 559 | struct bfd_link_hash_entry *h; |
| 560 | |
| 561 | /* This symbol is being wrapped. We want to replace all |
| 562 | references to SYM with references to __wrap_SYM. */ |
| 563 | |
| 564 | amt = strlen (l) + sizeof WRAP + 1; |
| 565 | n = (char *) bfd_malloc (amt); |
| 566 | if (n == NULL) |
| 567 | return NULL; |
| 568 | |
| 569 | n[0] = prefix; |
| 570 | n[1] = '\0'; |
| 571 | strcat (n, WRAP); |
| 572 | strcat (n, l); |
| 573 | h = bfd_link_hash_lookup (info->hash, n, create, TRUE, follow); |
| 574 | free (n); |
| 575 | return h; |
| 576 | } |
| 577 | |
| 578 | #undef REAL |
| 579 | #define REAL "__real_" |
| 580 | |
| 581 | if (*l == '_' |
| 582 | && CONST_STRNEQ (l, REAL) |
| 583 | && bfd_hash_lookup (info->wrap_hash, l + sizeof REAL - 1, |
| 584 | FALSE, FALSE) != NULL) |
| 585 | { |
| 586 | char *n; |
| 587 | struct bfd_link_hash_entry *h; |
| 588 | |
| 589 | /* This is a reference to __real_SYM, where SYM is being |
| 590 | wrapped. We want to replace all references to __real_SYM |
| 591 | with references to SYM. */ |
| 592 | |
| 593 | amt = strlen (l + sizeof REAL - 1) + 2; |
| 594 | n = (char *) bfd_malloc (amt); |
| 595 | if (n == NULL) |
| 596 | return NULL; |
| 597 | |
| 598 | n[0] = prefix; |
| 599 | n[1] = '\0'; |
| 600 | strcat (n, l + sizeof REAL - 1); |
| 601 | h = bfd_link_hash_lookup (info->hash, n, create, TRUE, follow); |
| 602 | free (n); |
| 603 | return h; |
| 604 | } |
| 605 | |
| 606 | #undef REAL |
| 607 | } |
| 608 | |
| 609 | return bfd_link_hash_lookup (info->hash, string, create, copy, follow); |
| 610 | } |
| 611 | |
| 612 | /* If H is a wrapped symbol, ie. the symbol name starts with "__wrap_" |
| 613 | and the remainder is found in wrap_hash, return the real symbol. */ |
| 614 | |
| 615 | struct bfd_link_hash_entry * |
| 616 | unwrap_hash_lookup (struct bfd_link_info *info, |
| 617 | bfd *input_bfd, |
| 618 | struct bfd_link_hash_entry *h) |
| 619 | { |
| 620 | const char *l = h->root.string; |
| 621 | |
| 622 | if (*l == bfd_get_symbol_leading_char (input_bfd) |
| 623 | || *l == info->wrap_char) |
| 624 | ++l; |
| 625 | |
| 626 | if (CONST_STRNEQ (l, WRAP)) |
| 627 | { |
| 628 | l += sizeof WRAP - 1; |
| 629 | |
| 630 | if (bfd_hash_lookup (info->wrap_hash, l, FALSE, FALSE) != NULL) |
| 631 | { |
| 632 | char save = 0; |
| 633 | if (l - (sizeof WRAP - 1) != h->root.string) |
| 634 | { |
| 635 | --l; |
| 636 | save = *l; |
| 637 | *(char *) l = *h->root.string; |
| 638 | } |
| 639 | h = bfd_link_hash_lookup (info->hash, l, FALSE, FALSE, FALSE); |
| 640 | if (save) |
| 641 | *(char *) l = save; |
| 642 | } |
| 643 | } |
| 644 | return h; |
| 645 | } |
| 646 | #undef WRAP |
| 647 | |
| 648 | /* Traverse a generic link hash table. Differs from bfd_hash_traverse |
| 649 | in the treatment of warning symbols. When warning symbols are |
| 650 | created they replace the real symbol, so you don't get to see the |
| 651 | real symbol in a bfd_hash_traverse. This traversal calls func with |
| 652 | the real symbol. */ |
| 653 | |
| 654 | void |
| 655 | bfd_link_hash_traverse |
| 656 | (struct bfd_link_hash_table *htab, |
| 657 | bfd_boolean (*func) (struct bfd_link_hash_entry *, void *), |
| 658 | void *info) |
| 659 | { |
| 660 | unsigned int i; |
| 661 | |
| 662 | htab->table.frozen = 1; |
| 663 | for (i = 0; i < htab->table.size; i++) |
| 664 | { |
| 665 | struct bfd_link_hash_entry *p; |
| 666 | |
| 667 | p = (struct bfd_link_hash_entry *) htab->table.table[i]; |
| 668 | for (; p != NULL; p = (struct bfd_link_hash_entry *) p->root.next) |
| 669 | if (!(*func) (p->type == bfd_link_hash_warning ? p->u.i.link : p, info)) |
| 670 | goto out; |
| 671 | } |
| 672 | out: |
| 673 | htab->table.frozen = 0; |
| 674 | } |
| 675 | |
| 676 | /* Add a symbol to the linker hash table undefs list. */ |
| 677 | |
| 678 | void |
| 679 | bfd_link_add_undef (struct bfd_link_hash_table *table, |
| 680 | struct bfd_link_hash_entry *h) |
| 681 | { |
| 682 | BFD_ASSERT (h->u.undef.next == NULL); |
| 683 | if (table->undefs_tail != NULL) |
| 684 | table->undefs_tail->u.undef.next = h; |
| 685 | if (table->undefs == NULL) |
| 686 | table->undefs = h; |
| 687 | table->undefs_tail = h; |
| 688 | } |
| 689 | |
| 690 | /* The undefs list was designed so that in normal use we don't need to |
| 691 | remove entries. However, if symbols on the list are changed from |
| 692 | bfd_link_hash_undefined to either bfd_link_hash_undefweak or |
| 693 | bfd_link_hash_new for some reason, then they must be removed from the |
| 694 | list. Failure to do so might result in the linker attempting to add |
| 695 | the symbol to the list again at a later stage. */ |
| 696 | |
| 697 | void |
| 698 | bfd_link_repair_undef_list (struct bfd_link_hash_table *table) |
| 699 | { |
| 700 | struct bfd_link_hash_entry **pun; |
| 701 | |
| 702 | pun = &table->undefs; |
| 703 | while (*pun != NULL) |
| 704 | { |
| 705 | struct bfd_link_hash_entry *h = *pun; |
| 706 | |
| 707 | if (h->type == bfd_link_hash_new |
| 708 | || h->type == bfd_link_hash_undefweak) |
| 709 | { |
| 710 | *pun = h->u.undef.next; |
| 711 | h->u.undef.next = NULL; |
| 712 | if (h == table->undefs_tail) |
| 713 | { |
| 714 | if (pun == &table->undefs) |
| 715 | table->undefs_tail = NULL; |
| 716 | else |
| 717 | /* pun points at an u.undef.next field. Go back to |
| 718 | the start of the link_hash_entry. */ |
| 719 | table->undefs_tail = (struct bfd_link_hash_entry *) |
| 720 | ((char *) pun - ((char *) &h->u.undef.next - (char *) h)); |
| 721 | break; |
| 722 | } |
| 723 | } |
| 724 | else |
| 725 | pun = &h->u.undef.next; |
| 726 | } |
| 727 | } |
| 728 | \f |
| 729 | /* Routine to create an entry in a generic link hash table. */ |
| 730 | |
| 731 | struct bfd_hash_entry * |
| 732 | _bfd_generic_link_hash_newfunc (struct bfd_hash_entry *entry, |
| 733 | struct bfd_hash_table *table, |
| 734 | const char *string) |
| 735 | { |
| 736 | /* Allocate the structure if it has not already been allocated by a |
| 737 | subclass. */ |
| 738 | if (entry == NULL) |
| 739 | { |
| 740 | entry = (struct bfd_hash_entry *) |
| 741 | bfd_hash_allocate (table, sizeof (struct generic_link_hash_entry)); |
| 742 | if (entry == NULL) |
| 743 | return entry; |
| 744 | } |
| 745 | |
| 746 | /* Call the allocation method of the superclass. */ |
| 747 | entry = _bfd_link_hash_newfunc (entry, table, string); |
| 748 | if (entry) |
| 749 | { |
| 750 | struct generic_link_hash_entry *ret; |
| 751 | |
| 752 | /* Set local fields. */ |
| 753 | ret = (struct generic_link_hash_entry *) entry; |
| 754 | ret->written = FALSE; |
| 755 | ret->sym = NULL; |
| 756 | } |
| 757 | |
| 758 | return entry; |
| 759 | } |
| 760 | |
| 761 | /* Create a generic link hash table. */ |
| 762 | |
| 763 | struct bfd_link_hash_table * |
| 764 | _bfd_generic_link_hash_table_create (bfd *abfd) |
| 765 | { |
| 766 | struct generic_link_hash_table *ret; |
| 767 | bfd_size_type amt = sizeof (struct generic_link_hash_table); |
| 768 | |
| 769 | ret = (struct generic_link_hash_table *) bfd_malloc (amt); |
| 770 | if (ret == NULL) |
| 771 | return NULL; |
| 772 | if (! _bfd_link_hash_table_init (&ret->root, abfd, |
| 773 | _bfd_generic_link_hash_newfunc, |
| 774 | sizeof (struct generic_link_hash_entry))) |
| 775 | { |
| 776 | free (ret); |
| 777 | return NULL; |
| 778 | } |
| 779 | return &ret->root; |
| 780 | } |
| 781 | |
| 782 | void |
| 783 | _bfd_generic_link_hash_table_free (bfd *obfd) |
| 784 | { |
| 785 | struct generic_link_hash_table *ret; |
| 786 | |
| 787 | BFD_ASSERT (obfd->is_linker_output && obfd->link.hash); |
| 788 | ret = (struct generic_link_hash_table *) obfd->link.hash; |
| 789 | bfd_hash_table_free (&ret->root.table); |
| 790 | free (ret); |
| 791 | obfd->link.hash = NULL; |
| 792 | obfd->is_linker_output = FALSE; |
| 793 | } |
| 794 | |
| 795 | /* Grab the symbols for an object file when doing a generic link. We |
| 796 | store the symbols in the outsymbols field. We need to keep them |
| 797 | around for the entire link to ensure that we only read them once. |
| 798 | If we read them multiple times, we might wind up with relocs and |
| 799 | the hash table pointing to different instances of the symbol |
| 800 | structure. */ |
| 801 | |
| 802 | bfd_boolean |
| 803 | bfd_generic_link_read_symbols (bfd *abfd) |
| 804 | { |
| 805 | if (bfd_get_outsymbols (abfd) == NULL) |
| 806 | { |
| 807 | long symsize; |
| 808 | long symcount; |
| 809 | |
| 810 | symsize = bfd_get_symtab_upper_bound (abfd); |
| 811 | if (symsize < 0) |
| 812 | return FALSE; |
| 813 | bfd_get_outsymbols (abfd) = (struct bfd_symbol **) bfd_alloc (abfd, |
| 814 | symsize); |
| 815 | if (bfd_get_outsymbols (abfd) == NULL && symsize != 0) |
| 816 | return FALSE; |
| 817 | symcount = bfd_canonicalize_symtab (abfd, bfd_get_outsymbols (abfd)); |
| 818 | if (symcount < 0) |
| 819 | return FALSE; |
| 820 | bfd_get_symcount (abfd) = symcount; |
| 821 | } |
| 822 | |
| 823 | return TRUE; |
| 824 | } |
| 825 | \f |
| 826 | /* Indicate that we are only retrieving symbol values from this |
| 827 | section. We want the symbols to act as though the values in the |
| 828 | file are absolute. */ |
| 829 | |
| 830 | void |
| 831 | _bfd_generic_link_just_syms (asection *sec, |
| 832 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 833 | { |
| 834 | sec->sec_info_type = SEC_INFO_TYPE_JUST_SYMS; |
| 835 | sec->output_section = bfd_abs_section_ptr; |
| 836 | sec->output_offset = sec->vma; |
| 837 | } |
| 838 | |
| 839 | /* Copy the symbol type and other attributes for a linker script |
| 840 | assignment from HSRC to HDEST. |
| 841 | The default implementation does nothing. */ |
| 842 | void |
| 843 | _bfd_generic_copy_link_hash_symbol_type (bfd *abfd ATTRIBUTE_UNUSED, |
| 844 | struct bfd_link_hash_entry *hdest ATTRIBUTE_UNUSED, |
| 845 | struct bfd_link_hash_entry *hsrc ATTRIBUTE_UNUSED) |
| 846 | { |
| 847 | } |
| 848 | |
| 849 | /* Generic function to add symbols from an object file to the |
| 850 | global hash table. */ |
| 851 | |
| 852 | bfd_boolean |
| 853 | _bfd_generic_link_add_symbols (bfd *abfd, struct bfd_link_info *info) |
| 854 | { |
| 855 | bfd_boolean ret; |
| 856 | |
| 857 | switch (bfd_get_format (abfd)) |
| 858 | { |
| 859 | case bfd_object: |
| 860 | ret = generic_link_add_object_symbols (abfd, info); |
| 861 | break; |
| 862 | case bfd_archive: |
| 863 | ret = (_bfd_generic_link_add_archive_symbols |
| 864 | (abfd, info, generic_link_check_archive_element)); |
| 865 | break; |
| 866 | default: |
| 867 | bfd_set_error (bfd_error_wrong_format); |
| 868 | ret = FALSE; |
| 869 | } |
| 870 | |
| 871 | return ret; |
| 872 | } |
| 873 | |
| 874 | /* Add symbols from an object file to the global hash table. */ |
| 875 | |
| 876 | static bfd_boolean |
| 877 | generic_link_add_object_symbols (bfd *abfd, |
| 878 | struct bfd_link_info *info) |
| 879 | { |
| 880 | bfd_size_type symcount; |
| 881 | struct bfd_symbol **outsyms; |
| 882 | |
| 883 | if (!bfd_generic_link_read_symbols (abfd)) |
| 884 | return FALSE; |
| 885 | symcount = _bfd_generic_link_get_symcount (abfd); |
| 886 | outsyms = _bfd_generic_link_get_symbols (abfd); |
| 887 | return generic_link_add_symbol_list (abfd, info, symcount, outsyms); |
| 888 | } |
| 889 | \f |
| 890 | /* Generic function to add symbols from an archive file to the global |
| 891 | hash file. This function presumes that the archive symbol table |
| 892 | has already been read in (this is normally done by the |
| 893 | bfd_check_format entry point). It looks through the archive symbol |
| 894 | table for symbols that are undefined or common in the linker global |
| 895 | symbol hash table. When one is found, the CHECKFN argument is used |
| 896 | to see if an object file should be included. This allows targets |
| 897 | to customize common symbol behaviour. CHECKFN should set *PNEEDED |
| 898 | to TRUE if the object file should be included, and must also call |
| 899 | the bfd_link_info add_archive_element callback function and handle |
| 900 | adding the symbols to the global hash table. CHECKFN must notice |
| 901 | if the callback indicates a substitute BFD, and arrange to add |
| 902 | those symbols instead if it does so. CHECKFN should only return |
| 903 | FALSE if some sort of error occurs. */ |
| 904 | |
| 905 | bfd_boolean |
| 906 | _bfd_generic_link_add_archive_symbols |
| 907 | (bfd *abfd, |
| 908 | struct bfd_link_info *info, |
| 909 | bfd_boolean (*checkfn) (bfd *, struct bfd_link_info *, |
| 910 | struct bfd_link_hash_entry *, const char *, |
| 911 | bfd_boolean *)) |
| 912 | { |
| 913 | bfd_boolean loop; |
| 914 | bfd_size_type amt; |
| 915 | unsigned char *included; |
| 916 | |
| 917 | if (! bfd_has_map (abfd)) |
| 918 | { |
| 919 | /* An empty archive is a special case. */ |
| 920 | if (bfd_openr_next_archived_file (abfd, NULL) == NULL) |
| 921 | return TRUE; |
| 922 | bfd_set_error (bfd_error_no_armap); |
| 923 | return FALSE; |
| 924 | } |
| 925 | |
| 926 | amt = bfd_ardata (abfd)->symdef_count; |
| 927 | if (amt == 0) |
| 928 | return TRUE; |
| 929 | amt *= sizeof (*included); |
| 930 | included = (unsigned char *) bfd_zmalloc (amt); |
| 931 | if (included == NULL) |
| 932 | return FALSE; |
| 933 | |
| 934 | do |
| 935 | { |
| 936 | carsym *arsyms; |
| 937 | carsym *arsym_end; |
| 938 | carsym *arsym; |
| 939 | unsigned int indx; |
| 940 | file_ptr last_ar_offset = -1; |
| 941 | bfd_boolean needed = FALSE; |
| 942 | bfd *element = NULL; |
| 943 | |
| 944 | loop = FALSE; |
| 945 | arsyms = bfd_ardata (abfd)->symdefs; |
| 946 | arsym_end = arsyms + bfd_ardata (abfd)->symdef_count; |
| 947 | for (arsym = arsyms, indx = 0; arsym < arsym_end; arsym++, indx++) |
| 948 | { |
| 949 | struct bfd_link_hash_entry *h; |
| 950 | struct bfd_link_hash_entry *undefs_tail; |
| 951 | |
| 952 | if (included[indx]) |
| 953 | continue; |
| 954 | if (needed && arsym->file_offset == last_ar_offset) |
| 955 | { |
| 956 | included[indx] = 1; |
| 957 | continue; |
| 958 | } |
| 959 | |
| 960 | if (arsym->name == NULL) |
| 961 | goto error_return; |
| 962 | |
| 963 | h = bfd_link_hash_lookup (info->hash, arsym->name, |
| 964 | FALSE, FALSE, TRUE); |
| 965 | |
| 966 | if (h == NULL |
| 967 | && info->pei386_auto_import |
| 968 | && CONST_STRNEQ (arsym->name, "__imp_")) |
| 969 | h = bfd_link_hash_lookup (info->hash, arsym->name + 6, |
| 970 | FALSE, FALSE, TRUE); |
| 971 | if (h == NULL) |
| 972 | continue; |
| 973 | |
| 974 | if (h->type != bfd_link_hash_undefined |
| 975 | && h->type != bfd_link_hash_common) |
| 976 | { |
| 977 | if (h->type != bfd_link_hash_undefweak) |
| 978 | /* Symbol must be defined. Don't check it again. */ |
| 979 | included[indx] = 1; |
| 980 | continue; |
| 981 | } |
| 982 | |
| 983 | if (last_ar_offset != arsym->file_offset) |
| 984 | { |
| 985 | last_ar_offset = arsym->file_offset; |
| 986 | element = _bfd_get_elt_at_filepos (abfd, last_ar_offset); |
| 987 | if (element == NULL |
| 988 | || !bfd_check_format (element, bfd_object)) |
| 989 | goto error_return; |
| 990 | } |
| 991 | |
| 992 | undefs_tail = info->hash->undefs_tail; |
| 993 | |
| 994 | /* CHECKFN will see if this element should be included, and |
| 995 | go ahead and include it if appropriate. */ |
| 996 | if (! (*checkfn) (element, info, h, arsym->name, &needed)) |
| 997 | goto error_return; |
| 998 | |
| 999 | if (needed) |
| 1000 | { |
| 1001 | unsigned int mark; |
| 1002 | |
| 1003 | /* Look backward to mark all symbols from this object file |
| 1004 | which we have already seen in this pass. */ |
| 1005 | mark = indx; |
| 1006 | do |
| 1007 | { |
| 1008 | included[mark] = 1; |
| 1009 | if (mark == 0) |
| 1010 | break; |
| 1011 | --mark; |
| 1012 | } |
| 1013 | while (arsyms[mark].file_offset == last_ar_offset); |
| 1014 | |
| 1015 | if (undefs_tail != info->hash->undefs_tail) |
| 1016 | loop = TRUE; |
| 1017 | } |
| 1018 | } |
| 1019 | } while (loop); |
| 1020 | |
| 1021 | free (included); |
| 1022 | return TRUE; |
| 1023 | |
| 1024 | error_return: |
| 1025 | free (included); |
| 1026 | return FALSE; |
| 1027 | } |
| 1028 | \f |
| 1029 | /* See if we should include an archive element. */ |
| 1030 | |
| 1031 | static bfd_boolean |
| 1032 | generic_link_check_archive_element (bfd *abfd, |
| 1033 | struct bfd_link_info *info, |
| 1034 | struct bfd_link_hash_entry *h, |
| 1035 | const char *name ATTRIBUTE_UNUSED, |
| 1036 | bfd_boolean *pneeded) |
| 1037 | { |
| 1038 | asymbol **pp, **ppend; |
| 1039 | |
| 1040 | *pneeded = FALSE; |
| 1041 | |
| 1042 | if (!bfd_generic_link_read_symbols (abfd)) |
| 1043 | return FALSE; |
| 1044 | |
| 1045 | pp = _bfd_generic_link_get_symbols (abfd); |
| 1046 | ppend = pp + _bfd_generic_link_get_symcount (abfd); |
| 1047 | for (; pp < ppend; pp++) |
| 1048 | { |
| 1049 | asymbol *p; |
| 1050 | |
| 1051 | p = *pp; |
| 1052 | |
| 1053 | /* We are only interested in globally visible symbols. */ |
| 1054 | if (! bfd_is_com_section (p->section) |
| 1055 | && (p->flags & (BSF_GLOBAL | BSF_INDIRECT | BSF_WEAK)) == 0) |
| 1056 | continue; |
| 1057 | |
| 1058 | /* We are only interested if we know something about this |
| 1059 | symbol, and it is undefined or common. An undefined weak |
| 1060 | symbol (type bfd_link_hash_undefweak) is not considered to be |
| 1061 | a reference when pulling files out of an archive. See the |
| 1062 | SVR4 ABI, p. 4-27. */ |
| 1063 | h = bfd_link_hash_lookup (info->hash, bfd_asymbol_name (p), FALSE, |
| 1064 | FALSE, TRUE); |
| 1065 | if (h == NULL |
| 1066 | || (h->type != bfd_link_hash_undefined |
| 1067 | && h->type != bfd_link_hash_common)) |
| 1068 | continue; |
| 1069 | |
| 1070 | /* P is a symbol we are looking for. */ |
| 1071 | |
| 1072 | if (! bfd_is_com_section (p->section) |
| 1073 | || (h->type == bfd_link_hash_undefined |
| 1074 | && h->u.undef.abfd == NULL)) |
| 1075 | { |
| 1076 | /* P is not a common symbol, or an undefined reference was |
| 1077 | created from outside BFD such as from a linker -u option. |
| 1078 | This object file defines the symbol, so pull it in. */ |
| 1079 | *pneeded = TRUE; |
| 1080 | if (!(*info->callbacks |
| 1081 | ->add_archive_element) (info, abfd, bfd_asymbol_name (p), |
| 1082 | &abfd)) |
| 1083 | return FALSE; |
| 1084 | /* Potentially, the add_archive_element hook may have set a |
| 1085 | substitute BFD for us. */ |
| 1086 | return bfd_link_add_symbols (abfd, info); |
| 1087 | } |
| 1088 | |
| 1089 | /* P is a common symbol. */ |
| 1090 | |
| 1091 | if (h->type == bfd_link_hash_undefined) |
| 1092 | { |
| 1093 | bfd *symbfd; |
| 1094 | bfd_vma size; |
| 1095 | unsigned int power; |
| 1096 | |
| 1097 | /* Turn the symbol into a common symbol but do not link in |
| 1098 | the object file. This is how a.out works. Object |
| 1099 | formats that require different semantics must implement |
| 1100 | this function differently. This symbol is already on the |
| 1101 | undefs list. We add the section to a common section |
| 1102 | attached to symbfd to ensure that it is in a BFD which |
| 1103 | will be linked in. */ |
| 1104 | symbfd = h->u.undef.abfd; |
| 1105 | h->type = bfd_link_hash_common; |
| 1106 | h->u.c.p = (struct bfd_link_hash_common_entry *) |
| 1107 | bfd_hash_allocate (&info->hash->table, |
| 1108 | sizeof (struct bfd_link_hash_common_entry)); |
| 1109 | if (h->u.c.p == NULL) |
| 1110 | return FALSE; |
| 1111 | |
| 1112 | size = bfd_asymbol_value (p); |
| 1113 | h->u.c.size = size; |
| 1114 | |
| 1115 | power = bfd_log2 (size); |
| 1116 | if (power > 4) |
| 1117 | power = 4; |
| 1118 | h->u.c.p->alignment_power = power; |
| 1119 | |
| 1120 | if (p->section == bfd_com_section_ptr) |
| 1121 | h->u.c.p->section = bfd_make_section_old_way (symbfd, "COMMON"); |
| 1122 | else |
| 1123 | h->u.c.p->section = bfd_make_section_old_way (symbfd, |
| 1124 | p->section->name); |
| 1125 | h->u.c.p->section->flags |= SEC_ALLOC; |
| 1126 | } |
| 1127 | else |
| 1128 | { |
| 1129 | /* Adjust the size of the common symbol if necessary. This |
| 1130 | is how a.out works. Object formats that require |
| 1131 | different semantics must implement this function |
| 1132 | differently. */ |
| 1133 | if (bfd_asymbol_value (p) > h->u.c.size) |
| 1134 | h->u.c.size = bfd_asymbol_value (p); |
| 1135 | } |
| 1136 | } |
| 1137 | |
| 1138 | /* This archive element is not needed. */ |
| 1139 | return TRUE; |
| 1140 | } |
| 1141 | |
| 1142 | /* Add the symbols from an object file to the global hash table. ABFD |
| 1143 | is the object file. INFO is the linker information. SYMBOL_COUNT |
| 1144 | is the number of symbols. SYMBOLS is the list of symbols. */ |
| 1145 | |
| 1146 | static bfd_boolean |
| 1147 | generic_link_add_symbol_list (bfd *abfd, |
| 1148 | struct bfd_link_info *info, |
| 1149 | bfd_size_type symbol_count, |
| 1150 | asymbol **symbols) |
| 1151 | { |
| 1152 | asymbol **pp, **ppend; |
| 1153 | |
| 1154 | pp = symbols; |
| 1155 | ppend = symbols + symbol_count; |
| 1156 | for (; pp < ppend; pp++) |
| 1157 | { |
| 1158 | asymbol *p; |
| 1159 | |
| 1160 | p = *pp; |
| 1161 | |
| 1162 | if ((p->flags & (BSF_INDIRECT |
| 1163 | | BSF_WARNING |
| 1164 | | BSF_GLOBAL |
| 1165 | | BSF_CONSTRUCTOR |
| 1166 | | BSF_WEAK)) != 0 |
| 1167 | || bfd_is_und_section (bfd_get_section (p)) |
| 1168 | || bfd_is_com_section (bfd_get_section (p)) |
| 1169 | || bfd_is_ind_section (bfd_get_section (p))) |
| 1170 | { |
| 1171 | const char *name; |
| 1172 | const char *string; |
| 1173 | struct generic_link_hash_entry *h; |
| 1174 | struct bfd_link_hash_entry *bh; |
| 1175 | |
| 1176 | string = name = bfd_asymbol_name (p); |
| 1177 | if (((p->flags & BSF_INDIRECT) != 0 |
| 1178 | || bfd_is_ind_section (p->section)) |
| 1179 | && pp + 1 < ppend) |
| 1180 | { |
| 1181 | pp++; |
| 1182 | string = bfd_asymbol_name (*pp); |
| 1183 | } |
| 1184 | else if ((p->flags & BSF_WARNING) != 0 |
| 1185 | && pp + 1 < ppend) |
| 1186 | { |
| 1187 | /* The name of P is actually the warning string, and the |
| 1188 | next symbol is the one to warn about. */ |
| 1189 | pp++; |
| 1190 | name = bfd_asymbol_name (*pp); |
| 1191 | } |
| 1192 | |
| 1193 | bh = NULL; |
| 1194 | if (! (_bfd_generic_link_add_one_symbol |
| 1195 | (info, abfd, name, p->flags, bfd_get_section (p), |
| 1196 | p->value, string, FALSE, FALSE, &bh))) |
| 1197 | return FALSE; |
| 1198 | h = (struct generic_link_hash_entry *) bh; |
| 1199 | |
| 1200 | /* If this is a constructor symbol, and the linker didn't do |
| 1201 | anything with it, then we want to just pass the symbol |
| 1202 | through to the output file. This will happen when |
| 1203 | linking with -r. */ |
| 1204 | if ((p->flags & BSF_CONSTRUCTOR) != 0 |
| 1205 | && (h == NULL || h->root.type == bfd_link_hash_new)) |
| 1206 | { |
| 1207 | p->udata.p = NULL; |
| 1208 | continue; |
| 1209 | } |
| 1210 | |
| 1211 | /* Save the BFD symbol so that we don't lose any backend |
| 1212 | specific information that may be attached to it. We only |
| 1213 | want this one if it gives more information than the |
| 1214 | existing one; we don't want to replace a defined symbol |
| 1215 | with an undefined one. This routine may be called with a |
| 1216 | hash table other than the generic hash table, so we only |
| 1217 | do this if we are certain that the hash table is a |
| 1218 | generic one. */ |
| 1219 | if (info->output_bfd->xvec == abfd->xvec) |
| 1220 | { |
| 1221 | if (h->sym == NULL |
| 1222 | || (! bfd_is_und_section (bfd_get_section (p)) |
| 1223 | && (! bfd_is_com_section (bfd_get_section (p)) |
| 1224 | || bfd_is_und_section (bfd_get_section (h->sym))))) |
| 1225 | { |
| 1226 | h->sym = p; |
| 1227 | /* BSF_OLD_COMMON is a hack to support COFF reloc |
| 1228 | reading, and it should go away when the COFF |
| 1229 | linker is switched to the new version. */ |
| 1230 | if (bfd_is_com_section (bfd_get_section (p))) |
| 1231 | p->flags |= BSF_OLD_COMMON; |
| 1232 | } |
| 1233 | } |
| 1234 | |
| 1235 | /* Store a back pointer from the symbol to the hash |
| 1236 | table entry for the benefit of relaxation code until |
| 1237 | it gets rewritten to not use asymbol structures. |
| 1238 | Setting this is also used to check whether these |
| 1239 | symbols were set up by the generic linker. */ |
| 1240 | p->udata.p = h; |
| 1241 | } |
| 1242 | } |
| 1243 | |
| 1244 | return TRUE; |
| 1245 | } |
| 1246 | \f |
| 1247 | /* We use a state table to deal with adding symbols from an object |
| 1248 | file. The first index into the state table describes the symbol |
| 1249 | from the object file. The second index into the state table is the |
| 1250 | type of the symbol in the hash table. */ |
| 1251 | |
| 1252 | /* The symbol from the object file is turned into one of these row |
| 1253 | values. */ |
| 1254 | |
| 1255 | enum link_row |
| 1256 | { |
| 1257 | UNDEF_ROW, /* Undefined. */ |
| 1258 | UNDEFW_ROW, /* Weak undefined. */ |
| 1259 | DEF_ROW, /* Defined. */ |
| 1260 | DEFW_ROW, /* Weak defined. */ |
| 1261 | COMMON_ROW, /* Common. */ |
| 1262 | INDR_ROW, /* Indirect. */ |
| 1263 | WARN_ROW, /* Warning. */ |
| 1264 | SET_ROW /* Member of set. */ |
| 1265 | }; |
| 1266 | |
| 1267 | /* apparently needed for Hitachi 3050R(HI-UX/WE2)? */ |
| 1268 | #undef FAIL |
| 1269 | |
| 1270 | /* The actions to take in the state table. */ |
| 1271 | |
| 1272 | enum link_action |
| 1273 | { |
| 1274 | FAIL, /* Abort. */ |
| 1275 | UND, /* Mark symbol undefined. */ |
| 1276 | WEAK, /* Mark symbol weak undefined. */ |
| 1277 | DEF, /* Mark symbol defined. */ |
| 1278 | DEFW, /* Mark symbol weak defined. */ |
| 1279 | COM, /* Mark symbol common. */ |
| 1280 | REF, /* Mark defined symbol referenced. */ |
| 1281 | CREF, /* Possibly warn about common reference to defined symbol. */ |
| 1282 | CDEF, /* Define existing common symbol. */ |
| 1283 | NOACT, /* No action. */ |
| 1284 | BIG, /* Mark symbol common using largest size. */ |
| 1285 | MDEF, /* Multiple definition error. */ |
| 1286 | MIND, /* Multiple indirect symbols. */ |
| 1287 | IND, /* Make indirect symbol. */ |
| 1288 | CIND, /* Make indirect symbol from existing common symbol. */ |
| 1289 | SET, /* Add value to set. */ |
| 1290 | MWARN, /* Make warning symbol. */ |
| 1291 | WARN, /* Warn if referenced, else MWARN. */ |
| 1292 | CYCLE, /* Repeat with symbol pointed to. */ |
| 1293 | REFC, /* Mark indirect symbol referenced and then CYCLE. */ |
| 1294 | WARNC /* Issue warning and then CYCLE. */ |
| 1295 | }; |
| 1296 | |
| 1297 | /* The state table itself. The first index is a link_row and the |
| 1298 | second index is a bfd_link_hash_type. */ |
| 1299 | |
| 1300 | static const enum link_action link_action[8][8] = |
| 1301 | { |
| 1302 | /* current\prev new undef undefw def defw com indr warn */ |
| 1303 | /* UNDEF_ROW */ {UND, NOACT, UND, REF, REF, NOACT, REFC, WARNC }, |
| 1304 | /* UNDEFW_ROW */ {WEAK, NOACT, NOACT, REF, REF, NOACT, REFC, WARNC }, |
| 1305 | /* DEF_ROW */ {DEF, DEF, DEF, MDEF, DEF, CDEF, MDEF, CYCLE }, |
| 1306 | /* DEFW_ROW */ {DEFW, DEFW, DEFW, NOACT, NOACT, NOACT, NOACT, CYCLE }, |
| 1307 | /* COMMON_ROW */ {COM, COM, COM, CREF, COM, BIG, REFC, WARNC }, |
| 1308 | /* INDR_ROW */ {IND, IND, IND, MDEF, IND, CIND, MIND, CYCLE }, |
| 1309 | /* WARN_ROW */ {MWARN, WARN, WARN, WARN, WARN, WARN, WARN, NOACT }, |
| 1310 | /* SET_ROW */ {SET, SET, SET, SET, SET, SET, CYCLE, CYCLE } |
| 1311 | }; |
| 1312 | |
| 1313 | /* Most of the entries in the LINK_ACTION table are straightforward, |
| 1314 | but a few are somewhat subtle. |
| 1315 | |
| 1316 | A reference to an indirect symbol (UNDEF_ROW/indr or |
| 1317 | UNDEFW_ROW/indr) is counted as a reference both to the indirect |
| 1318 | symbol and to the symbol the indirect symbol points to. |
| 1319 | |
| 1320 | A reference to a warning symbol (UNDEF_ROW/warn or UNDEFW_ROW/warn) |
| 1321 | causes the warning to be issued. |
| 1322 | |
| 1323 | A common definition of an indirect symbol (COMMON_ROW/indr) is |
| 1324 | treated as a multiple definition error. Likewise for an indirect |
| 1325 | definition of a common symbol (INDR_ROW/com). |
| 1326 | |
| 1327 | An indirect definition of a warning (INDR_ROW/warn) does not cause |
| 1328 | the warning to be issued. |
| 1329 | |
| 1330 | If a warning is created for an indirect symbol (WARN_ROW/indr) no |
| 1331 | warning is created for the symbol the indirect symbol points to. |
| 1332 | |
| 1333 | Adding an entry to a set does not count as a reference to a set, |
| 1334 | and no warning is issued (SET_ROW/warn). */ |
| 1335 | |
| 1336 | /* Return the BFD in which a hash entry has been defined, if known. */ |
| 1337 | |
| 1338 | static bfd * |
| 1339 | hash_entry_bfd (struct bfd_link_hash_entry *h) |
| 1340 | { |
| 1341 | while (h->type == bfd_link_hash_warning) |
| 1342 | h = h->u.i.link; |
| 1343 | switch (h->type) |
| 1344 | { |
| 1345 | default: |
| 1346 | return NULL; |
| 1347 | case bfd_link_hash_undefined: |
| 1348 | case bfd_link_hash_undefweak: |
| 1349 | return h->u.undef.abfd; |
| 1350 | case bfd_link_hash_defined: |
| 1351 | case bfd_link_hash_defweak: |
| 1352 | return h->u.def.section->owner; |
| 1353 | case bfd_link_hash_common: |
| 1354 | return h->u.c.p->section->owner; |
| 1355 | } |
| 1356 | /*NOTREACHED*/ |
| 1357 | } |
| 1358 | |
| 1359 | /* Add a symbol to the global hash table. |
| 1360 | ABFD is the BFD the symbol comes from. |
| 1361 | NAME is the name of the symbol. |
| 1362 | FLAGS is the BSF_* bits associated with the symbol. |
| 1363 | SECTION is the section in which the symbol is defined; this may be |
| 1364 | bfd_und_section_ptr or bfd_com_section_ptr. |
| 1365 | VALUE is the value of the symbol, relative to the section. |
| 1366 | STRING is used for either an indirect symbol, in which case it is |
| 1367 | the name of the symbol to indirect to, or a warning symbol, in |
| 1368 | which case it is the warning string. |
| 1369 | COPY is TRUE if NAME or STRING must be copied into locally |
| 1370 | allocated memory if they need to be saved. |
| 1371 | COLLECT is TRUE if we should automatically collect gcc constructor |
| 1372 | or destructor names as collect2 does. |
| 1373 | HASHP, if not NULL, is a place to store the created hash table |
| 1374 | entry; if *HASHP is not NULL, the caller has already looked up |
| 1375 | the hash table entry, and stored it in *HASHP. */ |
| 1376 | |
| 1377 | bfd_boolean |
| 1378 | _bfd_generic_link_add_one_symbol (struct bfd_link_info *info, |
| 1379 | bfd *abfd, |
| 1380 | const char *name, |
| 1381 | flagword flags, |
| 1382 | asection *section, |
| 1383 | bfd_vma value, |
| 1384 | const char *string, |
| 1385 | bfd_boolean copy, |
| 1386 | bfd_boolean collect, |
| 1387 | struct bfd_link_hash_entry **hashp) |
| 1388 | { |
| 1389 | enum link_row row; |
| 1390 | struct bfd_link_hash_entry *h; |
| 1391 | struct bfd_link_hash_entry *inh = NULL; |
| 1392 | bfd_boolean cycle; |
| 1393 | |
| 1394 | BFD_ASSERT (section != NULL); |
| 1395 | |
| 1396 | if (bfd_is_ind_section (section) |
| 1397 | || (flags & BSF_INDIRECT) != 0) |
| 1398 | { |
| 1399 | row = INDR_ROW; |
| 1400 | /* Create the indirect symbol here. This is for the benefit of |
| 1401 | the plugin "notice" function. |
| 1402 | STRING is the name of the symbol we want to indirect to. */ |
| 1403 | inh = bfd_wrapped_link_hash_lookup (abfd, info, string, TRUE, |
| 1404 | copy, FALSE); |
| 1405 | if (inh == NULL) |
| 1406 | return FALSE; |
| 1407 | } |
| 1408 | else if ((flags & BSF_WARNING) != 0) |
| 1409 | row = WARN_ROW; |
| 1410 | else if ((flags & BSF_CONSTRUCTOR) != 0) |
| 1411 | row = SET_ROW; |
| 1412 | else if (bfd_is_und_section (section)) |
| 1413 | { |
| 1414 | if ((flags & BSF_WEAK) != 0) |
| 1415 | row = UNDEFW_ROW; |
| 1416 | else |
| 1417 | row = UNDEF_ROW; |
| 1418 | } |
| 1419 | else if ((flags & BSF_WEAK) != 0) |
| 1420 | row = DEFW_ROW; |
| 1421 | else if (bfd_is_com_section (section)) |
| 1422 | { |
| 1423 | row = COMMON_ROW; |
| 1424 | static bfd_boolean report_plugin_err = TRUE; |
| 1425 | if (!bfd_link_relocatable (info) && report_plugin_err) |
| 1426 | { |
| 1427 | if (abfd->lto_slim_object) |
| 1428 | { |
| 1429 | report_plugin_err = FALSE; |
| 1430 | _bfd_error_handler |
| 1431 | (_("%pB: plugin needed to handle lto object"), abfd); |
| 1432 | } |
| 1433 | else if (name[0] == '_' |
| 1434 | && name[1] == '_' |
| 1435 | && strcmp (name + (name[2] == '_'), "__gnu_lto_slim") == 0) |
| 1436 | { |
| 1437 | report_plugin_err = FALSE; |
| 1438 | _bfd_error_handler |
| 1439 | (_("%pB: plugin needed to handle lto object"), abfd); |
| 1440 | } |
| 1441 | } |
| 1442 | } |
| 1443 | else |
| 1444 | row = DEF_ROW; |
| 1445 | |
| 1446 | if (hashp != NULL && *hashp != NULL) |
| 1447 | h = *hashp; |
| 1448 | else |
| 1449 | { |
| 1450 | if (row == UNDEF_ROW || row == UNDEFW_ROW) |
| 1451 | h = bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, copy, FALSE); |
| 1452 | else |
| 1453 | h = bfd_link_hash_lookup (info->hash, name, TRUE, copy, FALSE); |
| 1454 | if (h == NULL) |
| 1455 | { |
| 1456 | if (hashp != NULL) |
| 1457 | *hashp = NULL; |
| 1458 | return FALSE; |
| 1459 | } |
| 1460 | } |
| 1461 | |
| 1462 | if (info->notice_all |
| 1463 | || (info->notice_hash != NULL |
| 1464 | && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)) |
| 1465 | { |
| 1466 | if (! (*info->callbacks->notice) (info, h, inh, |
| 1467 | abfd, section, value, flags)) |
| 1468 | return FALSE; |
| 1469 | } |
| 1470 | |
| 1471 | if (hashp != NULL) |
| 1472 | *hashp = h; |
| 1473 | |
| 1474 | do |
| 1475 | { |
| 1476 | enum link_action action; |
| 1477 | int prev; |
| 1478 | |
| 1479 | prev = h->type; |
| 1480 | /* Treat symbols defined by early linker script pass as undefined. */ |
| 1481 | if (h->ldscript_def) |
| 1482 | prev = bfd_link_hash_undefined; |
| 1483 | cycle = FALSE; |
| 1484 | action = link_action[(int) row][prev]; |
| 1485 | switch (action) |
| 1486 | { |
| 1487 | case FAIL: |
| 1488 | abort (); |
| 1489 | |
| 1490 | case NOACT: |
| 1491 | /* Do nothing. */ |
| 1492 | break; |
| 1493 | |
| 1494 | case UND: |
| 1495 | /* Make a new undefined symbol. */ |
| 1496 | h->type = bfd_link_hash_undefined; |
| 1497 | h->u.undef.abfd = abfd; |
| 1498 | bfd_link_add_undef (info->hash, h); |
| 1499 | break; |
| 1500 | |
| 1501 | case WEAK: |
| 1502 | /* Make a new weak undefined symbol. */ |
| 1503 | h->type = bfd_link_hash_undefweak; |
| 1504 | h->u.undef.abfd = abfd; |
| 1505 | break; |
| 1506 | |
| 1507 | case CDEF: |
| 1508 | /* We have found a definition for a symbol which was |
| 1509 | previously common. */ |
| 1510 | BFD_ASSERT (h->type == bfd_link_hash_common); |
| 1511 | (*info->callbacks->multiple_common) (info, h, abfd, |
| 1512 | bfd_link_hash_defined, 0); |
| 1513 | /* Fall through. */ |
| 1514 | case DEF: |
| 1515 | case DEFW: |
| 1516 | { |
| 1517 | enum bfd_link_hash_type oldtype; |
| 1518 | |
| 1519 | /* Define a symbol. */ |
| 1520 | oldtype = h->type; |
| 1521 | if (action == DEFW) |
| 1522 | h->type = bfd_link_hash_defweak; |
| 1523 | else |
| 1524 | h->type = bfd_link_hash_defined; |
| 1525 | h->u.def.section = section; |
| 1526 | h->u.def.value = value; |
| 1527 | h->linker_def = 0; |
| 1528 | h->ldscript_def = 0; |
| 1529 | |
| 1530 | /* If we have been asked to, we act like collect2 and |
| 1531 | identify all functions that might be global |
| 1532 | constructors and destructors and pass them up in a |
| 1533 | callback. We only do this for certain object file |
| 1534 | types, since many object file types can handle this |
| 1535 | automatically. */ |
| 1536 | if (collect && name[0] == '_') |
| 1537 | { |
| 1538 | const char *s; |
| 1539 | |
| 1540 | /* A constructor or destructor name starts like this: |
| 1541 | _+GLOBAL_[_.$][ID][_.$] where the first [_.$] and |
| 1542 | the second are the same character (we accept any |
| 1543 | character there, in case a new object file format |
| 1544 | comes along with even worse naming restrictions). */ |
| 1545 | |
| 1546 | #define CONS_PREFIX "GLOBAL_" |
| 1547 | #define CONS_PREFIX_LEN (sizeof CONS_PREFIX - 1) |
| 1548 | |
| 1549 | s = name + 1; |
| 1550 | while (*s == '_') |
| 1551 | ++s; |
| 1552 | if (s[0] == 'G' && CONST_STRNEQ (s, CONS_PREFIX)) |
| 1553 | { |
| 1554 | char c; |
| 1555 | |
| 1556 | c = s[CONS_PREFIX_LEN + 1]; |
| 1557 | if ((c == 'I' || c == 'D') |
| 1558 | && s[CONS_PREFIX_LEN] == s[CONS_PREFIX_LEN + 2]) |
| 1559 | { |
| 1560 | /* If this is a definition of a symbol which |
| 1561 | was previously weakly defined, we are in |
| 1562 | trouble. We have already added a |
| 1563 | constructor entry for the weak defined |
| 1564 | symbol, and now we are trying to add one |
| 1565 | for the new symbol. Fortunately, this case |
| 1566 | should never arise in practice. */ |
| 1567 | if (oldtype == bfd_link_hash_defweak) |
| 1568 | abort (); |
| 1569 | |
| 1570 | (*info->callbacks->constructor) (info, c == 'I', |
| 1571 | h->root.string, abfd, |
| 1572 | section, value); |
| 1573 | } |
| 1574 | } |
| 1575 | } |
| 1576 | } |
| 1577 | |
| 1578 | break; |
| 1579 | |
| 1580 | case COM: |
| 1581 | /* We have found a common definition for a symbol. */ |
| 1582 | if (h->type == bfd_link_hash_new) |
| 1583 | bfd_link_add_undef (info->hash, h); |
| 1584 | h->type = bfd_link_hash_common; |
| 1585 | h->u.c.p = (struct bfd_link_hash_common_entry *) |
| 1586 | bfd_hash_allocate (&info->hash->table, |
| 1587 | sizeof (struct bfd_link_hash_common_entry)); |
| 1588 | if (h->u.c.p == NULL) |
| 1589 | return FALSE; |
| 1590 | |
| 1591 | h->u.c.size = value; |
| 1592 | |
| 1593 | /* Select a default alignment based on the size. This may |
| 1594 | be overridden by the caller. */ |
| 1595 | { |
| 1596 | unsigned int power; |
| 1597 | |
| 1598 | power = bfd_log2 (value); |
| 1599 | if (power > 4) |
| 1600 | power = 4; |
| 1601 | h->u.c.p->alignment_power = power; |
| 1602 | } |
| 1603 | |
| 1604 | /* The section of a common symbol is only used if the common |
| 1605 | symbol is actually allocated. It basically provides a |
| 1606 | hook for the linker script to decide which output section |
| 1607 | the common symbols should be put in. In most cases, the |
| 1608 | section of a common symbol will be bfd_com_section_ptr, |
| 1609 | the code here will choose a common symbol section named |
| 1610 | "COMMON", and the linker script will contain *(COMMON) in |
| 1611 | the appropriate place. A few targets use separate common |
| 1612 | sections for small symbols, and they require special |
| 1613 | handling. */ |
| 1614 | if (section == bfd_com_section_ptr) |
| 1615 | { |
| 1616 | h->u.c.p->section = bfd_make_section_old_way (abfd, "COMMON"); |
| 1617 | h->u.c.p->section->flags |= SEC_ALLOC; |
| 1618 | } |
| 1619 | else if (section->owner != abfd) |
| 1620 | { |
| 1621 | h->u.c.p->section = bfd_make_section_old_way (abfd, |
| 1622 | section->name); |
| 1623 | h->u.c.p->section->flags |= SEC_ALLOC; |
| 1624 | } |
| 1625 | else |
| 1626 | h->u.c.p->section = section; |
| 1627 | h->linker_def = 0; |
| 1628 | h->ldscript_def = 0; |
| 1629 | break; |
| 1630 | |
| 1631 | case REF: |
| 1632 | /* A reference to a defined symbol. */ |
| 1633 | if (h->u.undef.next == NULL && info->hash->undefs_tail != h) |
| 1634 | h->u.undef.next = h; |
| 1635 | break; |
| 1636 | |
| 1637 | case BIG: |
| 1638 | /* We have found a common definition for a symbol which |
| 1639 | already had a common definition. Use the maximum of the |
| 1640 | two sizes, and use the section required by the larger symbol. */ |
| 1641 | BFD_ASSERT (h->type == bfd_link_hash_common); |
| 1642 | (*info->callbacks->multiple_common) (info, h, abfd, |
| 1643 | bfd_link_hash_common, value); |
| 1644 | if (value > h->u.c.size) |
| 1645 | { |
| 1646 | unsigned int power; |
| 1647 | |
| 1648 | h->u.c.size = value; |
| 1649 | |
| 1650 | /* Select a default alignment based on the size. This may |
| 1651 | be overridden by the caller. */ |
| 1652 | power = bfd_log2 (value); |
| 1653 | if (power > 4) |
| 1654 | power = 4; |
| 1655 | h->u.c.p->alignment_power = power; |
| 1656 | |
| 1657 | /* Some systems have special treatment for small commons, |
| 1658 | hence we want to select the section used by the larger |
| 1659 | symbol. This makes sure the symbol does not go in a |
| 1660 | small common section if it is now too large. */ |
| 1661 | if (section == bfd_com_section_ptr) |
| 1662 | { |
| 1663 | h->u.c.p->section |
| 1664 | = bfd_make_section_old_way (abfd, "COMMON"); |
| 1665 | h->u.c.p->section->flags |= SEC_ALLOC; |
| 1666 | } |
| 1667 | else if (section->owner != abfd) |
| 1668 | { |
| 1669 | h->u.c.p->section |
| 1670 | = bfd_make_section_old_way (abfd, section->name); |
| 1671 | h->u.c.p->section->flags |= SEC_ALLOC; |
| 1672 | } |
| 1673 | else |
| 1674 | h->u.c.p->section = section; |
| 1675 | } |
| 1676 | break; |
| 1677 | |
| 1678 | case CREF: |
| 1679 | /* We have found a common definition for a symbol which |
| 1680 | was already defined. */ |
| 1681 | (*info->callbacks->multiple_common) (info, h, abfd, |
| 1682 | bfd_link_hash_common, value); |
| 1683 | break; |
| 1684 | |
| 1685 | case MIND: |
| 1686 | /* Multiple indirect symbols. This is OK if they both point |
| 1687 | to the same symbol. */ |
| 1688 | if (strcmp (h->u.i.link->root.string, string) == 0) |
| 1689 | break; |
| 1690 | /* Fall through. */ |
| 1691 | case MDEF: |
| 1692 | /* Handle a multiple definition. */ |
| 1693 | (*info->callbacks->multiple_definition) (info, h, |
| 1694 | abfd, section, value); |
| 1695 | break; |
| 1696 | |
| 1697 | case CIND: |
| 1698 | /* Create an indirect symbol from an existing common symbol. */ |
| 1699 | BFD_ASSERT (h->type == bfd_link_hash_common); |
| 1700 | (*info->callbacks->multiple_common) (info, h, abfd, |
| 1701 | bfd_link_hash_indirect, 0); |
| 1702 | /* Fall through. */ |
| 1703 | case IND: |
| 1704 | if (inh->type == bfd_link_hash_indirect |
| 1705 | && inh->u.i.link == h) |
| 1706 | { |
| 1707 | _bfd_error_handler |
| 1708 | /* xgettext:c-format */ |
| 1709 | (_("%pB: indirect symbol `%s' to `%s' is a loop"), |
| 1710 | abfd, name, string); |
| 1711 | bfd_set_error (bfd_error_invalid_operation); |
| 1712 | return FALSE; |
| 1713 | } |
| 1714 | if (inh->type == bfd_link_hash_new) |
| 1715 | { |
| 1716 | inh->type = bfd_link_hash_undefined; |
| 1717 | inh->u.undef.abfd = abfd; |
| 1718 | bfd_link_add_undef (info->hash, inh); |
| 1719 | } |
| 1720 | |
| 1721 | /* If the indirect symbol has been referenced, we need to |
| 1722 | push the reference down to the symbol we are referencing. */ |
| 1723 | if (h->type != bfd_link_hash_new) |
| 1724 | { |
| 1725 | /* ??? If inh->type == bfd_link_hash_undefweak this |
| 1726 | converts inh to bfd_link_hash_undefined. */ |
| 1727 | row = UNDEF_ROW; |
| 1728 | cycle = TRUE; |
| 1729 | } |
| 1730 | |
| 1731 | h->type = bfd_link_hash_indirect; |
| 1732 | h->u.i.link = inh; |
| 1733 | /* Not setting h = h->u.i.link here means that when cycle is |
| 1734 | set above we'll always go to REFC, and then cycle again |
| 1735 | to the indirected symbol. This means that any successful |
| 1736 | change of an existing symbol to indirect counts as a |
| 1737 | reference. ??? That may not be correct when the existing |
| 1738 | symbol was defweak. */ |
| 1739 | break; |
| 1740 | |
| 1741 | case SET: |
| 1742 | /* Add an entry to a set. */ |
| 1743 | (*info->callbacks->add_to_set) (info, h, BFD_RELOC_CTOR, |
| 1744 | abfd, section, value); |
| 1745 | break; |
| 1746 | |
| 1747 | case WARNC: |
| 1748 | /* Issue a warning and cycle, except when the reference is |
| 1749 | in LTO IR. */ |
| 1750 | if (h->u.i.warning != NULL |
| 1751 | && (abfd->flags & BFD_PLUGIN) == 0) |
| 1752 | { |
| 1753 | (*info->callbacks->warning) (info, h->u.i.warning, |
| 1754 | h->root.string, abfd, NULL, 0); |
| 1755 | /* Only issue a warning once. */ |
| 1756 | h->u.i.warning = NULL; |
| 1757 | } |
| 1758 | /* Fall through. */ |
| 1759 | case CYCLE: |
| 1760 | /* Try again with the referenced symbol. */ |
| 1761 | h = h->u.i.link; |
| 1762 | cycle = TRUE; |
| 1763 | break; |
| 1764 | |
| 1765 | case REFC: |
| 1766 | /* A reference to an indirect symbol. */ |
| 1767 | if (h->u.undef.next == NULL && info->hash->undefs_tail != h) |
| 1768 | h->u.undef.next = h; |
| 1769 | h = h->u.i.link; |
| 1770 | cycle = TRUE; |
| 1771 | break; |
| 1772 | |
| 1773 | case WARN: |
| 1774 | /* Warn if this symbol has been referenced already from non-IR, |
| 1775 | otherwise add a warning. */ |
| 1776 | if ((!info->lto_plugin_active |
| 1777 | && (h->u.undef.next != NULL || info->hash->undefs_tail == h)) |
| 1778 | || h->non_ir_ref_regular |
| 1779 | || h->non_ir_ref_dynamic) |
| 1780 | { |
| 1781 | (*info->callbacks->warning) (info, string, h->root.string, |
| 1782 | hash_entry_bfd (h), NULL, 0); |
| 1783 | break; |
| 1784 | } |
| 1785 | /* Fall through. */ |
| 1786 | case MWARN: |
| 1787 | /* Make a warning symbol. */ |
| 1788 | { |
| 1789 | struct bfd_link_hash_entry *sub; |
| 1790 | |
| 1791 | /* STRING is the warning to give. */ |
| 1792 | sub = ((struct bfd_link_hash_entry *) |
| 1793 | ((*info->hash->table.newfunc) |
| 1794 | (NULL, &info->hash->table, h->root.string))); |
| 1795 | if (sub == NULL) |
| 1796 | return FALSE; |
| 1797 | *sub = *h; |
| 1798 | sub->type = bfd_link_hash_warning; |
| 1799 | sub->u.i.link = h; |
| 1800 | if (! copy) |
| 1801 | sub->u.i.warning = string; |
| 1802 | else |
| 1803 | { |
| 1804 | char *w; |
| 1805 | size_t len = strlen (string) + 1; |
| 1806 | |
| 1807 | w = (char *) bfd_hash_allocate (&info->hash->table, len); |
| 1808 | if (w == NULL) |
| 1809 | return FALSE; |
| 1810 | memcpy (w, string, len); |
| 1811 | sub->u.i.warning = w; |
| 1812 | } |
| 1813 | |
| 1814 | bfd_hash_replace (&info->hash->table, |
| 1815 | (struct bfd_hash_entry *) h, |
| 1816 | (struct bfd_hash_entry *) sub); |
| 1817 | if (hashp != NULL) |
| 1818 | *hashp = sub; |
| 1819 | } |
| 1820 | break; |
| 1821 | } |
| 1822 | } |
| 1823 | while (cycle); |
| 1824 | |
| 1825 | return TRUE; |
| 1826 | } |
| 1827 | \f |
| 1828 | /* Generic final link routine. */ |
| 1829 | |
| 1830 | bfd_boolean |
| 1831 | _bfd_generic_final_link (bfd *abfd, struct bfd_link_info *info) |
| 1832 | { |
| 1833 | bfd *sub; |
| 1834 | asection *o; |
| 1835 | struct bfd_link_order *p; |
| 1836 | size_t outsymalloc; |
| 1837 | struct generic_write_global_symbol_info wginfo; |
| 1838 | |
| 1839 | bfd_get_outsymbols (abfd) = NULL; |
| 1840 | bfd_get_symcount (abfd) = 0; |
| 1841 | outsymalloc = 0; |
| 1842 | |
| 1843 | /* Mark all sections which will be included in the output file. */ |
| 1844 | for (o = abfd->sections; o != NULL; o = o->next) |
| 1845 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 1846 | if (p->type == bfd_indirect_link_order) |
| 1847 | p->u.indirect.section->linker_mark = TRUE; |
| 1848 | |
| 1849 | /* Build the output symbol table. */ |
| 1850 | for (sub = info->input_bfds; sub != NULL; sub = sub->link.next) |
| 1851 | if (! _bfd_generic_link_output_symbols (abfd, sub, info, &outsymalloc)) |
| 1852 | return FALSE; |
| 1853 | |
| 1854 | /* Accumulate the global symbols. */ |
| 1855 | wginfo.info = info; |
| 1856 | wginfo.output_bfd = abfd; |
| 1857 | wginfo.psymalloc = &outsymalloc; |
| 1858 | _bfd_generic_link_hash_traverse (_bfd_generic_hash_table (info), |
| 1859 | _bfd_generic_link_write_global_symbol, |
| 1860 | &wginfo); |
| 1861 | |
| 1862 | /* Make sure we have a trailing NULL pointer on OUTSYMBOLS. We |
| 1863 | shouldn't really need one, since we have SYMCOUNT, but some old |
| 1864 | code still expects one. */ |
| 1865 | if (! generic_add_output_symbol (abfd, &outsymalloc, NULL)) |
| 1866 | return FALSE; |
| 1867 | |
| 1868 | if (bfd_link_relocatable (info)) |
| 1869 | { |
| 1870 | /* Allocate space for the output relocs for each section. */ |
| 1871 | for (o = abfd->sections; o != NULL; o = o->next) |
| 1872 | { |
| 1873 | o->reloc_count = 0; |
| 1874 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 1875 | { |
| 1876 | if (p->type == bfd_section_reloc_link_order |
| 1877 | || p->type == bfd_symbol_reloc_link_order) |
| 1878 | ++o->reloc_count; |
| 1879 | else if (p->type == bfd_indirect_link_order) |
| 1880 | { |
| 1881 | asection *input_section; |
| 1882 | bfd *input_bfd; |
| 1883 | long relsize; |
| 1884 | arelent **relocs; |
| 1885 | asymbol **symbols; |
| 1886 | long reloc_count; |
| 1887 | |
| 1888 | input_section = p->u.indirect.section; |
| 1889 | input_bfd = input_section->owner; |
| 1890 | relsize = bfd_get_reloc_upper_bound (input_bfd, |
| 1891 | input_section); |
| 1892 | if (relsize < 0) |
| 1893 | return FALSE; |
| 1894 | relocs = (arelent **) bfd_malloc (relsize); |
| 1895 | if (!relocs && relsize != 0) |
| 1896 | return FALSE; |
| 1897 | symbols = _bfd_generic_link_get_symbols (input_bfd); |
| 1898 | reloc_count = bfd_canonicalize_reloc (input_bfd, |
| 1899 | input_section, |
| 1900 | relocs, |
| 1901 | symbols); |
| 1902 | free (relocs); |
| 1903 | if (reloc_count < 0) |
| 1904 | return FALSE; |
| 1905 | BFD_ASSERT ((unsigned long) reloc_count |
| 1906 | == input_section->reloc_count); |
| 1907 | o->reloc_count += reloc_count; |
| 1908 | } |
| 1909 | } |
| 1910 | if (o->reloc_count > 0) |
| 1911 | { |
| 1912 | bfd_size_type amt; |
| 1913 | |
| 1914 | amt = o->reloc_count; |
| 1915 | amt *= sizeof (arelent *); |
| 1916 | o->orelocation = (struct reloc_cache_entry **) bfd_alloc (abfd, amt); |
| 1917 | if (!o->orelocation) |
| 1918 | return FALSE; |
| 1919 | o->flags |= SEC_RELOC; |
| 1920 | /* Reset the count so that it can be used as an index |
| 1921 | when putting in the output relocs. */ |
| 1922 | o->reloc_count = 0; |
| 1923 | } |
| 1924 | } |
| 1925 | } |
| 1926 | |
| 1927 | /* Handle all the link order information for the sections. */ |
| 1928 | for (o = abfd->sections; o != NULL; o = o->next) |
| 1929 | { |
| 1930 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
| 1931 | { |
| 1932 | switch (p->type) |
| 1933 | { |
| 1934 | case bfd_section_reloc_link_order: |
| 1935 | case bfd_symbol_reloc_link_order: |
| 1936 | if (! _bfd_generic_reloc_link_order (abfd, info, o, p)) |
| 1937 | return FALSE; |
| 1938 | break; |
| 1939 | case bfd_indirect_link_order: |
| 1940 | if (! default_indirect_link_order (abfd, info, o, p, TRUE)) |
| 1941 | return FALSE; |
| 1942 | break; |
| 1943 | default: |
| 1944 | if (! _bfd_default_link_order (abfd, info, o, p)) |
| 1945 | return FALSE; |
| 1946 | break; |
| 1947 | } |
| 1948 | } |
| 1949 | } |
| 1950 | |
| 1951 | return TRUE; |
| 1952 | } |
| 1953 | |
| 1954 | /* Add an output symbol to the output BFD. */ |
| 1955 | |
| 1956 | static bfd_boolean |
| 1957 | generic_add_output_symbol (bfd *output_bfd, size_t *psymalloc, asymbol *sym) |
| 1958 | { |
| 1959 | if (bfd_get_symcount (output_bfd) >= *psymalloc) |
| 1960 | { |
| 1961 | asymbol **newsyms; |
| 1962 | bfd_size_type amt; |
| 1963 | |
| 1964 | if (*psymalloc == 0) |
| 1965 | *psymalloc = 124; |
| 1966 | else |
| 1967 | *psymalloc *= 2; |
| 1968 | amt = *psymalloc; |
| 1969 | amt *= sizeof (asymbol *); |
| 1970 | newsyms = (asymbol **) bfd_realloc (bfd_get_outsymbols (output_bfd), amt); |
| 1971 | if (newsyms == NULL) |
| 1972 | return FALSE; |
| 1973 | bfd_get_outsymbols (output_bfd) = newsyms; |
| 1974 | } |
| 1975 | |
| 1976 | bfd_get_outsymbols (output_bfd) [bfd_get_symcount (output_bfd)] = sym; |
| 1977 | if (sym != NULL) |
| 1978 | ++ bfd_get_symcount (output_bfd); |
| 1979 | |
| 1980 | return TRUE; |
| 1981 | } |
| 1982 | |
| 1983 | /* Handle the symbols for an input BFD. */ |
| 1984 | |
| 1985 | bfd_boolean |
| 1986 | _bfd_generic_link_output_symbols (bfd *output_bfd, |
| 1987 | bfd *input_bfd, |
| 1988 | struct bfd_link_info *info, |
| 1989 | size_t *psymalloc) |
| 1990 | { |
| 1991 | asymbol **sym_ptr; |
| 1992 | asymbol **sym_end; |
| 1993 | |
| 1994 | if (!bfd_generic_link_read_symbols (input_bfd)) |
| 1995 | return FALSE; |
| 1996 | |
| 1997 | /* Create a filename symbol if we are supposed to. */ |
| 1998 | if (info->create_object_symbols_section != NULL) |
| 1999 | { |
| 2000 | asection *sec; |
| 2001 | |
| 2002 | for (sec = input_bfd->sections; sec != NULL; sec = sec->next) |
| 2003 | { |
| 2004 | if (sec->output_section == info->create_object_symbols_section) |
| 2005 | { |
| 2006 | asymbol *newsym; |
| 2007 | |
| 2008 | newsym = bfd_make_empty_symbol (input_bfd); |
| 2009 | if (!newsym) |
| 2010 | return FALSE; |
| 2011 | newsym->name = input_bfd->filename; |
| 2012 | newsym->value = 0; |
| 2013 | newsym->flags = BSF_LOCAL | BSF_FILE; |
| 2014 | newsym->section = sec; |
| 2015 | |
| 2016 | if (! generic_add_output_symbol (output_bfd, psymalloc, |
| 2017 | newsym)) |
| 2018 | return FALSE; |
| 2019 | |
| 2020 | break; |
| 2021 | } |
| 2022 | } |
| 2023 | } |
| 2024 | |
| 2025 | /* Adjust the values of the globally visible symbols, and write out |
| 2026 | local symbols. */ |
| 2027 | sym_ptr = _bfd_generic_link_get_symbols (input_bfd); |
| 2028 | sym_end = sym_ptr + _bfd_generic_link_get_symcount (input_bfd); |
| 2029 | for (; sym_ptr < sym_end; sym_ptr++) |
| 2030 | { |
| 2031 | asymbol *sym; |
| 2032 | struct generic_link_hash_entry *h; |
| 2033 | bfd_boolean output; |
| 2034 | |
| 2035 | h = NULL; |
| 2036 | sym = *sym_ptr; |
| 2037 | if ((sym->flags & (BSF_INDIRECT |
| 2038 | | BSF_WARNING |
| 2039 | | BSF_GLOBAL |
| 2040 | | BSF_CONSTRUCTOR |
| 2041 | | BSF_WEAK)) != 0 |
| 2042 | || bfd_is_und_section (bfd_get_section (sym)) |
| 2043 | || bfd_is_com_section (bfd_get_section (sym)) |
| 2044 | || bfd_is_ind_section (bfd_get_section (sym))) |
| 2045 | { |
| 2046 | if (sym->udata.p != NULL) |
| 2047 | h = (struct generic_link_hash_entry *) sym->udata.p; |
| 2048 | else if ((sym->flags & BSF_CONSTRUCTOR) != 0) |
| 2049 | { |
| 2050 | /* This case normally means that the main linker code |
| 2051 | deliberately ignored this constructor symbol. We |
| 2052 | should just pass it through. This will screw up if |
| 2053 | the constructor symbol is from a different, |
| 2054 | non-generic, object file format, but the case will |
| 2055 | only arise when linking with -r, which will probably |
| 2056 | fail anyhow, since there will be no way to represent |
| 2057 | the relocs in the output format being used. */ |
| 2058 | h = NULL; |
| 2059 | } |
| 2060 | else if (bfd_is_und_section (bfd_get_section (sym))) |
| 2061 | h = ((struct generic_link_hash_entry *) |
| 2062 | bfd_wrapped_link_hash_lookup (output_bfd, info, |
| 2063 | bfd_asymbol_name (sym), |
| 2064 | FALSE, FALSE, TRUE)); |
| 2065 | else |
| 2066 | h = _bfd_generic_link_hash_lookup (_bfd_generic_hash_table (info), |
| 2067 | bfd_asymbol_name (sym), |
| 2068 | FALSE, FALSE, TRUE); |
| 2069 | |
| 2070 | if (h != NULL) |
| 2071 | { |
| 2072 | /* Force all references to this symbol to point to |
| 2073 | the same area in memory. It is possible that |
| 2074 | this routine will be called with a hash table |
| 2075 | other than a generic hash table, so we double |
| 2076 | check that. */ |
| 2077 | if (info->output_bfd->xvec == input_bfd->xvec) |
| 2078 | { |
| 2079 | if (h->sym != NULL) |
| 2080 | *sym_ptr = sym = h->sym; |
| 2081 | } |
| 2082 | |
| 2083 | switch (h->root.type) |
| 2084 | { |
| 2085 | default: |
| 2086 | case bfd_link_hash_new: |
| 2087 | abort (); |
| 2088 | case bfd_link_hash_undefined: |
| 2089 | break; |
| 2090 | case bfd_link_hash_undefweak: |
| 2091 | sym->flags |= BSF_WEAK; |
| 2092 | break; |
| 2093 | case bfd_link_hash_indirect: |
| 2094 | h = (struct generic_link_hash_entry *) h->root.u.i.link; |
| 2095 | /* fall through */ |
| 2096 | case bfd_link_hash_defined: |
| 2097 | sym->flags |= BSF_GLOBAL; |
| 2098 | sym->flags &=~ (BSF_WEAK | BSF_CONSTRUCTOR); |
| 2099 | sym->value = h->root.u.def.value; |
| 2100 | sym->section = h->root.u.def.section; |
| 2101 | break; |
| 2102 | case bfd_link_hash_defweak: |
| 2103 | sym->flags |= BSF_WEAK; |
| 2104 | sym->flags &=~ BSF_CONSTRUCTOR; |
| 2105 | sym->value = h->root.u.def.value; |
| 2106 | sym->section = h->root.u.def.section; |
| 2107 | break; |
| 2108 | case bfd_link_hash_common: |
| 2109 | sym->value = h->root.u.c.size; |
| 2110 | sym->flags |= BSF_GLOBAL; |
| 2111 | if (! bfd_is_com_section (sym->section)) |
| 2112 | { |
| 2113 | BFD_ASSERT (bfd_is_und_section (sym->section)); |
| 2114 | sym->section = bfd_com_section_ptr; |
| 2115 | } |
| 2116 | /* We do not set the section of the symbol to |
| 2117 | h->root.u.c.p->section. That value was saved so |
| 2118 | that we would know where to allocate the symbol |
| 2119 | if it was defined. In this case the type is |
| 2120 | still bfd_link_hash_common, so we did not define |
| 2121 | it, so we do not want to use that section. */ |
| 2122 | break; |
| 2123 | } |
| 2124 | } |
| 2125 | } |
| 2126 | |
| 2127 | if ((sym->flags & BSF_KEEP) == 0 |
| 2128 | && (info->strip == strip_all |
| 2129 | || (info->strip == strip_some |
| 2130 | && bfd_hash_lookup (info->keep_hash, bfd_asymbol_name (sym), |
| 2131 | FALSE, FALSE) == NULL))) |
| 2132 | output = FALSE; |
| 2133 | else if ((sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) != 0) |
| 2134 | { |
| 2135 | /* If this symbol is marked as occurring now, rather |
| 2136 | than at the end, output it now. This is used for |
| 2137 | COFF C_EXT FCN symbols. FIXME: There must be a |
| 2138 | better way. */ |
| 2139 | if (bfd_asymbol_bfd (sym) == input_bfd |
| 2140 | && (sym->flags & BSF_NOT_AT_END) != 0) |
| 2141 | output = TRUE; |
| 2142 | else |
| 2143 | output = FALSE; |
| 2144 | } |
| 2145 | else if ((sym->flags & BSF_KEEP) != 0) |
| 2146 | output = TRUE; |
| 2147 | else if (bfd_is_ind_section (sym->section)) |
| 2148 | output = FALSE; |
| 2149 | else if ((sym->flags & BSF_DEBUGGING) != 0) |
| 2150 | { |
| 2151 | if (info->strip == strip_none) |
| 2152 | output = TRUE; |
| 2153 | else |
| 2154 | output = FALSE; |
| 2155 | } |
| 2156 | else if (bfd_is_und_section (sym->section) |
| 2157 | || bfd_is_com_section (sym->section)) |
| 2158 | output = FALSE; |
| 2159 | else if ((sym->flags & BSF_LOCAL) != 0) |
| 2160 | { |
| 2161 | if ((sym->flags & BSF_WARNING) != 0) |
| 2162 | output = FALSE; |
| 2163 | else |
| 2164 | { |
| 2165 | switch (info->discard) |
| 2166 | { |
| 2167 | default: |
| 2168 | case discard_all: |
| 2169 | output = FALSE; |
| 2170 | break; |
| 2171 | case discard_sec_merge: |
| 2172 | output = TRUE; |
| 2173 | if (bfd_link_relocatable (info) |
| 2174 | || ! (sym->section->flags & SEC_MERGE)) |
| 2175 | break; |
| 2176 | /* FALLTHROUGH */ |
| 2177 | case discard_l: |
| 2178 | if (bfd_is_local_label (input_bfd, sym)) |
| 2179 | output = FALSE; |
| 2180 | else |
| 2181 | output = TRUE; |
| 2182 | break; |
| 2183 | case discard_none: |
| 2184 | output = TRUE; |
| 2185 | break; |
| 2186 | } |
| 2187 | } |
| 2188 | } |
| 2189 | else if ((sym->flags & BSF_CONSTRUCTOR)) |
| 2190 | { |
| 2191 | if (info->strip != strip_all) |
| 2192 | output = TRUE; |
| 2193 | else |
| 2194 | output = FALSE; |
| 2195 | } |
| 2196 | else if (sym->flags == 0 |
| 2197 | && (sym->section->owner->flags & BFD_PLUGIN) != 0) |
| 2198 | /* LTO doesn't set symbol information. We get here with the |
| 2199 | generic linker for a symbol that was "common" but no longer |
| 2200 | needs to be global. */ |
| 2201 | output = FALSE; |
| 2202 | else |
| 2203 | abort (); |
| 2204 | |
| 2205 | /* If this symbol is in a section which is not being included |
| 2206 | in the output file, then we don't want to output the |
| 2207 | symbol. */ |
| 2208 | if (!bfd_is_abs_section (sym->section) |
| 2209 | && bfd_section_removed_from_list (output_bfd, |
| 2210 | sym->section->output_section)) |
| 2211 | output = FALSE; |
| 2212 | |
| 2213 | if (output) |
| 2214 | { |
| 2215 | if (! generic_add_output_symbol (output_bfd, psymalloc, sym)) |
| 2216 | return FALSE; |
| 2217 | if (h != NULL) |
| 2218 | h->written = TRUE; |
| 2219 | } |
| 2220 | } |
| 2221 | |
| 2222 | return TRUE; |
| 2223 | } |
| 2224 | |
| 2225 | /* Set the section and value of a generic BFD symbol based on a linker |
| 2226 | hash table entry. */ |
| 2227 | |
| 2228 | static void |
| 2229 | set_symbol_from_hash (asymbol *sym, struct bfd_link_hash_entry *h) |
| 2230 | { |
| 2231 | switch (h->type) |
| 2232 | { |
| 2233 | default: |
| 2234 | abort (); |
| 2235 | break; |
| 2236 | case bfd_link_hash_new: |
| 2237 | /* This can happen when a constructor symbol is seen but we are |
| 2238 | not building constructors. */ |
| 2239 | if (sym->section != NULL) |
| 2240 | { |
| 2241 | BFD_ASSERT ((sym->flags & BSF_CONSTRUCTOR) != 0); |
| 2242 | } |
| 2243 | else |
| 2244 | { |
| 2245 | sym->flags |= BSF_CONSTRUCTOR; |
| 2246 | sym->section = bfd_abs_section_ptr; |
| 2247 | sym->value = 0; |
| 2248 | } |
| 2249 | break; |
| 2250 | case bfd_link_hash_undefined: |
| 2251 | sym->section = bfd_und_section_ptr; |
| 2252 | sym->value = 0; |
| 2253 | break; |
| 2254 | case bfd_link_hash_undefweak: |
| 2255 | sym->section = bfd_und_section_ptr; |
| 2256 | sym->value = 0; |
| 2257 | sym->flags |= BSF_WEAK; |
| 2258 | break; |
| 2259 | case bfd_link_hash_defined: |
| 2260 | sym->section = h->u.def.section; |
| 2261 | sym->value = h->u.def.value; |
| 2262 | break; |
| 2263 | case bfd_link_hash_defweak: |
| 2264 | sym->flags |= BSF_WEAK; |
| 2265 | sym->section = h->u.def.section; |
| 2266 | sym->value = h->u.def.value; |
| 2267 | break; |
| 2268 | case bfd_link_hash_common: |
| 2269 | sym->value = h->u.c.size; |
| 2270 | if (sym->section == NULL) |
| 2271 | sym->section = bfd_com_section_ptr; |
| 2272 | else if (! bfd_is_com_section (sym->section)) |
| 2273 | { |
| 2274 | BFD_ASSERT (bfd_is_und_section (sym->section)); |
| 2275 | sym->section = bfd_com_section_ptr; |
| 2276 | } |
| 2277 | /* Do not set the section; see _bfd_generic_link_output_symbols. */ |
| 2278 | break; |
| 2279 | case bfd_link_hash_indirect: |
| 2280 | case bfd_link_hash_warning: |
| 2281 | /* FIXME: What should we do here? */ |
| 2282 | break; |
| 2283 | } |
| 2284 | } |
| 2285 | |
| 2286 | /* Write out a global symbol, if it hasn't already been written out. |
| 2287 | This is called for each symbol in the hash table. */ |
| 2288 | |
| 2289 | bfd_boolean |
| 2290 | _bfd_generic_link_write_global_symbol (struct generic_link_hash_entry *h, |
| 2291 | void *data) |
| 2292 | { |
| 2293 | struct generic_write_global_symbol_info *wginfo = |
| 2294 | (struct generic_write_global_symbol_info *) data; |
| 2295 | asymbol *sym; |
| 2296 | |
| 2297 | if (h->written) |
| 2298 | return TRUE; |
| 2299 | |
| 2300 | h->written = TRUE; |
| 2301 | |
| 2302 | if (wginfo->info->strip == strip_all |
| 2303 | || (wginfo->info->strip == strip_some |
| 2304 | && bfd_hash_lookup (wginfo->info->keep_hash, h->root.root.string, |
| 2305 | FALSE, FALSE) == NULL)) |
| 2306 | return TRUE; |
| 2307 | |
| 2308 | if (h->sym != NULL) |
| 2309 | sym = h->sym; |
| 2310 | else |
| 2311 | { |
| 2312 | sym = bfd_make_empty_symbol (wginfo->output_bfd); |
| 2313 | if (!sym) |
| 2314 | return FALSE; |
| 2315 | sym->name = h->root.root.string; |
| 2316 | sym->flags = 0; |
| 2317 | } |
| 2318 | |
| 2319 | set_symbol_from_hash (sym, &h->root); |
| 2320 | |
| 2321 | sym->flags |= BSF_GLOBAL; |
| 2322 | |
| 2323 | if (! generic_add_output_symbol (wginfo->output_bfd, wginfo->psymalloc, |
| 2324 | sym)) |
| 2325 | { |
| 2326 | /* FIXME: No way to return failure. */ |
| 2327 | abort (); |
| 2328 | } |
| 2329 | |
| 2330 | return TRUE; |
| 2331 | } |
| 2332 | |
| 2333 | /* Create a relocation. */ |
| 2334 | |
| 2335 | bfd_boolean |
| 2336 | _bfd_generic_reloc_link_order (bfd *abfd, |
| 2337 | struct bfd_link_info *info, |
| 2338 | asection *sec, |
| 2339 | struct bfd_link_order *link_order) |
| 2340 | { |
| 2341 | arelent *r; |
| 2342 | |
| 2343 | if (! bfd_link_relocatable (info)) |
| 2344 | abort (); |
| 2345 | if (sec->orelocation == NULL) |
| 2346 | abort (); |
| 2347 | |
| 2348 | r = (arelent *) bfd_alloc (abfd, sizeof (arelent)); |
| 2349 | if (r == NULL) |
| 2350 | return FALSE; |
| 2351 | |
| 2352 | r->address = link_order->offset; |
| 2353 | r->howto = bfd_reloc_type_lookup (abfd, link_order->u.reloc.p->reloc); |
| 2354 | if (r->howto == 0) |
| 2355 | { |
| 2356 | bfd_set_error (bfd_error_bad_value); |
| 2357 | return FALSE; |
| 2358 | } |
| 2359 | |
| 2360 | /* Get the symbol to use for the relocation. */ |
| 2361 | if (link_order->type == bfd_section_reloc_link_order) |
| 2362 | r->sym_ptr_ptr = link_order->u.reloc.p->u.section->symbol_ptr_ptr; |
| 2363 | else |
| 2364 | { |
| 2365 | struct generic_link_hash_entry *h; |
| 2366 | |
| 2367 | h = ((struct generic_link_hash_entry *) |
| 2368 | bfd_wrapped_link_hash_lookup (abfd, info, |
| 2369 | link_order->u.reloc.p->u.name, |
| 2370 | FALSE, FALSE, TRUE)); |
| 2371 | if (h == NULL |
| 2372 | || ! h->written) |
| 2373 | { |
| 2374 | (*info->callbacks->unattached_reloc) |
| 2375 | (info, link_order->u.reloc.p->u.name, NULL, NULL, 0); |
| 2376 | bfd_set_error (bfd_error_bad_value); |
| 2377 | return FALSE; |
| 2378 | } |
| 2379 | r->sym_ptr_ptr = &h->sym; |
| 2380 | } |
| 2381 | |
| 2382 | /* If this is an inplace reloc, write the addend to the object file. |
| 2383 | Otherwise, store it in the reloc addend. */ |
| 2384 | if (! r->howto->partial_inplace) |
| 2385 | r->addend = link_order->u.reloc.p->addend; |
| 2386 | else |
| 2387 | { |
| 2388 | bfd_size_type size; |
| 2389 | bfd_reloc_status_type rstat; |
| 2390 | bfd_byte *buf; |
| 2391 | bfd_boolean ok; |
| 2392 | file_ptr loc; |
| 2393 | |
| 2394 | size = bfd_get_reloc_size (r->howto); |
| 2395 | buf = (bfd_byte *) bfd_zmalloc (size); |
| 2396 | if (buf == NULL && size != 0) |
| 2397 | return FALSE; |
| 2398 | rstat = _bfd_relocate_contents (r->howto, abfd, |
| 2399 | (bfd_vma) link_order->u.reloc.p->addend, |
| 2400 | buf); |
| 2401 | switch (rstat) |
| 2402 | { |
| 2403 | case bfd_reloc_ok: |
| 2404 | break; |
| 2405 | default: |
| 2406 | case bfd_reloc_outofrange: |
| 2407 | abort (); |
| 2408 | case bfd_reloc_overflow: |
| 2409 | (*info->callbacks->reloc_overflow) |
| 2410 | (info, NULL, |
| 2411 | (link_order->type == bfd_section_reloc_link_order |
| 2412 | ? bfd_section_name (abfd, link_order->u.reloc.p->u.section) |
| 2413 | : link_order->u.reloc.p->u.name), |
| 2414 | r->howto->name, link_order->u.reloc.p->addend, |
| 2415 | NULL, NULL, 0); |
| 2416 | break; |
| 2417 | } |
| 2418 | loc = link_order->offset * bfd_octets_per_byte (abfd); |
| 2419 | ok = bfd_set_section_contents (abfd, sec, buf, loc, size); |
| 2420 | free (buf); |
| 2421 | if (! ok) |
| 2422 | return FALSE; |
| 2423 | |
| 2424 | r->addend = 0; |
| 2425 | } |
| 2426 | |
| 2427 | sec->orelocation[sec->reloc_count] = r; |
| 2428 | ++sec->reloc_count; |
| 2429 | |
| 2430 | return TRUE; |
| 2431 | } |
| 2432 | \f |
| 2433 | /* Allocate a new link_order for a section. */ |
| 2434 | |
| 2435 | struct bfd_link_order * |
| 2436 | bfd_new_link_order (bfd *abfd, asection *section) |
| 2437 | { |
| 2438 | bfd_size_type amt = sizeof (struct bfd_link_order); |
| 2439 | struct bfd_link_order *new_lo; |
| 2440 | |
| 2441 | new_lo = (struct bfd_link_order *) bfd_zalloc (abfd, amt); |
| 2442 | if (!new_lo) |
| 2443 | return NULL; |
| 2444 | |
| 2445 | new_lo->type = bfd_undefined_link_order; |
| 2446 | |
| 2447 | if (section->map_tail.link_order != NULL) |
| 2448 | section->map_tail.link_order->next = new_lo; |
| 2449 | else |
| 2450 | section->map_head.link_order = new_lo; |
| 2451 | section->map_tail.link_order = new_lo; |
| 2452 | |
| 2453 | return new_lo; |
| 2454 | } |
| 2455 | |
| 2456 | /* Default link order processing routine. Note that we can not handle |
| 2457 | the reloc_link_order types here, since they depend upon the details |
| 2458 | of how the particular backends generates relocs. */ |
| 2459 | |
| 2460 | bfd_boolean |
| 2461 | _bfd_default_link_order (bfd *abfd, |
| 2462 | struct bfd_link_info *info, |
| 2463 | asection *sec, |
| 2464 | struct bfd_link_order *link_order) |
| 2465 | { |
| 2466 | switch (link_order->type) |
| 2467 | { |
| 2468 | case bfd_undefined_link_order: |
| 2469 | case bfd_section_reloc_link_order: |
| 2470 | case bfd_symbol_reloc_link_order: |
| 2471 | default: |
| 2472 | abort (); |
| 2473 | case bfd_indirect_link_order: |
| 2474 | return default_indirect_link_order (abfd, info, sec, link_order, |
| 2475 | FALSE); |
| 2476 | case bfd_data_link_order: |
| 2477 | return default_data_link_order (abfd, info, sec, link_order); |
| 2478 | } |
| 2479 | } |
| 2480 | |
| 2481 | /* Default routine to handle a bfd_data_link_order. */ |
| 2482 | |
| 2483 | static bfd_boolean |
| 2484 | default_data_link_order (bfd *abfd, |
| 2485 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 2486 | asection *sec, |
| 2487 | struct bfd_link_order *link_order) |
| 2488 | { |
| 2489 | bfd_size_type size; |
| 2490 | size_t fill_size; |
| 2491 | bfd_byte *fill; |
| 2492 | file_ptr loc; |
| 2493 | bfd_boolean result; |
| 2494 | |
| 2495 | BFD_ASSERT ((sec->flags & SEC_HAS_CONTENTS) != 0); |
| 2496 | |
| 2497 | size = link_order->size; |
| 2498 | if (size == 0) |
| 2499 | return TRUE; |
| 2500 | |
| 2501 | fill = link_order->u.data.contents; |
| 2502 | fill_size = link_order->u.data.size; |
| 2503 | if (fill_size == 0) |
| 2504 | { |
| 2505 | fill = abfd->arch_info->fill (size, bfd_big_endian (abfd), |
| 2506 | (sec->flags & SEC_CODE) != 0); |
| 2507 | if (fill == NULL) |
| 2508 | return FALSE; |
| 2509 | } |
| 2510 | else if (fill_size < size) |
| 2511 | { |
| 2512 | bfd_byte *p; |
| 2513 | fill = (bfd_byte *) bfd_malloc (size); |
| 2514 | if (fill == NULL) |
| 2515 | return FALSE; |
| 2516 | p = fill; |
| 2517 | if (fill_size == 1) |
| 2518 | memset (p, (int) link_order->u.data.contents[0], (size_t) size); |
| 2519 | else |
| 2520 | { |
| 2521 | do |
| 2522 | { |
| 2523 | memcpy (p, link_order->u.data.contents, fill_size); |
| 2524 | p += fill_size; |
| 2525 | size -= fill_size; |
| 2526 | } |
| 2527 | while (size >= fill_size); |
| 2528 | if (size != 0) |
| 2529 | memcpy (p, link_order->u.data.contents, (size_t) size); |
| 2530 | size = link_order->size; |
| 2531 | } |
| 2532 | } |
| 2533 | |
| 2534 | loc = link_order->offset * bfd_octets_per_byte (abfd); |
| 2535 | result = bfd_set_section_contents (abfd, sec, fill, loc, size); |
| 2536 | |
| 2537 | if (fill != link_order->u.data.contents) |
| 2538 | free (fill); |
| 2539 | return result; |
| 2540 | } |
| 2541 | |
| 2542 | /* Default routine to handle a bfd_indirect_link_order. */ |
| 2543 | |
| 2544 | static bfd_boolean |
| 2545 | default_indirect_link_order (bfd *output_bfd, |
| 2546 | struct bfd_link_info *info, |
| 2547 | asection *output_section, |
| 2548 | struct bfd_link_order *link_order, |
| 2549 | bfd_boolean generic_linker) |
| 2550 | { |
| 2551 | asection *input_section; |
| 2552 | bfd *input_bfd; |
| 2553 | bfd_byte *contents = NULL; |
| 2554 | bfd_byte *new_contents; |
| 2555 | bfd_size_type sec_size; |
| 2556 | file_ptr loc; |
| 2557 | |
| 2558 | BFD_ASSERT ((output_section->flags & SEC_HAS_CONTENTS) != 0); |
| 2559 | |
| 2560 | input_section = link_order->u.indirect.section; |
| 2561 | input_bfd = input_section->owner; |
| 2562 | if (input_section->size == 0) |
| 2563 | return TRUE; |
| 2564 | |
| 2565 | BFD_ASSERT (input_section->output_section == output_section); |
| 2566 | BFD_ASSERT (input_section->output_offset == link_order->offset); |
| 2567 | BFD_ASSERT (input_section->size == link_order->size); |
| 2568 | |
| 2569 | if (bfd_link_relocatable (info) |
| 2570 | && input_section->reloc_count > 0 |
| 2571 | && output_section->orelocation == NULL) |
| 2572 | { |
| 2573 | /* Space has not been allocated for the output relocations. |
| 2574 | This can happen when we are called by a specific backend |
| 2575 | because somebody is attempting to link together different |
| 2576 | types of object files. Handling this case correctly is |
| 2577 | difficult, and sometimes impossible. */ |
| 2578 | _bfd_error_handler |
| 2579 | /* xgettext:c-format */ |
| 2580 | (_("attempt to do relocatable link with %s input and %s output"), |
| 2581 | bfd_get_target (input_bfd), bfd_get_target (output_bfd)); |
| 2582 | bfd_set_error (bfd_error_wrong_format); |
| 2583 | return FALSE; |
| 2584 | } |
| 2585 | |
| 2586 | if (! generic_linker) |
| 2587 | { |
| 2588 | asymbol **sympp; |
| 2589 | asymbol **symppend; |
| 2590 | |
| 2591 | /* Get the canonical symbols. The generic linker will always |
| 2592 | have retrieved them by this point, but we are being called by |
| 2593 | a specific linker, presumably because we are linking |
| 2594 | different types of object files together. */ |
| 2595 | if (!bfd_generic_link_read_symbols (input_bfd)) |
| 2596 | return FALSE; |
| 2597 | |
| 2598 | /* Since we have been called by a specific linker, rather than |
| 2599 | the generic linker, the values of the symbols will not be |
| 2600 | right. They will be the values as seen in the input file, |
| 2601 | not the values of the final link. We need to fix them up |
| 2602 | before we can relocate the section. */ |
| 2603 | sympp = _bfd_generic_link_get_symbols (input_bfd); |
| 2604 | symppend = sympp + _bfd_generic_link_get_symcount (input_bfd); |
| 2605 | for (; sympp < symppend; sympp++) |
| 2606 | { |
| 2607 | asymbol *sym; |
| 2608 | struct bfd_link_hash_entry *h; |
| 2609 | |
| 2610 | sym = *sympp; |
| 2611 | |
| 2612 | if ((sym->flags & (BSF_INDIRECT |
| 2613 | | BSF_WARNING |
| 2614 | | BSF_GLOBAL |
| 2615 | | BSF_CONSTRUCTOR |
| 2616 | | BSF_WEAK)) != 0 |
| 2617 | || bfd_is_und_section (bfd_get_section (sym)) |
| 2618 | || bfd_is_com_section (bfd_get_section (sym)) |
| 2619 | || bfd_is_ind_section (bfd_get_section (sym))) |
| 2620 | { |
| 2621 | /* sym->udata may have been set by |
| 2622 | generic_link_add_symbol_list. */ |
| 2623 | if (sym->udata.p != NULL) |
| 2624 | h = (struct bfd_link_hash_entry *) sym->udata.p; |
| 2625 | else if (bfd_is_und_section (bfd_get_section (sym))) |
| 2626 | h = bfd_wrapped_link_hash_lookup (output_bfd, info, |
| 2627 | bfd_asymbol_name (sym), |
| 2628 | FALSE, FALSE, TRUE); |
| 2629 | else |
| 2630 | h = bfd_link_hash_lookup (info->hash, |
| 2631 | bfd_asymbol_name (sym), |
| 2632 | FALSE, FALSE, TRUE); |
| 2633 | if (h != NULL) |
| 2634 | set_symbol_from_hash (sym, h); |
| 2635 | } |
| 2636 | } |
| 2637 | } |
| 2638 | |
| 2639 | if ((output_section->flags & (SEC_GROUP | SEC_LINKER_CREATED)) == SEC_GROUP |
| 2640 | && input_section->size != 0) |
| 2641 | { |
| 2642 | /* Group section contents are set by bfd_elf_set_group_contents. */ |
| 2643 | if (!output_bfd->output_has_begun) |
| 2644 | { |
| 2645 | /* FIXME: This hack ensures bfd_elf_set_group_contents is called. */ |
| 2646 | if (!bfd_set_section_contents (output_bfd, output_section, "", 0, 1)) |
| 2647 | goto error_return; |
| 2648 | } |
| 2649 | new_contents = output_section->contents; |
| 2650 | BFD_ASSERT (new_contents != NULL); |
| 2651 | BFD_ASSERT (input_section->output_offset == 0); |
| 2652 | } |
| 2653 | else |
| 2654 | { |
| 2655 | /* Get and relocate the section contents. */ |
| 2656 | sec_size = (input_section->rawsize > input_section->size |
| 2657 | ? input_section->rawsize |
| 2658 | : input_section->size); |
| 2659 | contents = (bfd_byte *) bfd_malloc (sec_size); |
| 2660 | if (contents == NULL && sec_size != 0) |
| 2661 | goto error_return; |
| 2662 | new_contents = (bfd_get_relocated_section_contents |
| 2663 | (output_bfd, info, link_order, contents, |
| 2664 | bfd_link_relocatable (info), |
| 2665 | _bfd_generic_link_get_symbols (input_bfd))); |
| 2666 | if (!new_contents) |
| 2667 | goto error_return; |
| 2668 | } |
| 2669 | |
| 2670 | /* Output the section contents. */ |
| 2671 | loc = input_section->output_offset * bfd_octets_per_byte (output_bfd); |
| 2672 | if (! bfd_set_section_contents (output_bfd, output_section, |
| 2673 | new_contents, loc, input_section->size)) |
| 2674 | goto error_return; |
| 2675 | |
| 2676 | if (contents != NULL) |
| 2677 | free (contents); |
| 2678 | return TRUE; |
| 2679 | |
| 2680 | error_return: |
| 2681 | if (contents != NULL) |
| 2682 | free (contents); |
| 2683 | return FALSE; |
| 2684 | } |
| 2685 | |
| 2686 | /* A little routine to count the number of relocs in a link_order |
| 2687 | list. */ |
| 2688 | |
| 2689 | unsigned int |
| 2690 | _bfd_count_link_order_relocs (struct bfd_link_order *link_order) |
| 2691 | { |
| 2692 | register unsigned int c; |
| 2693 | register struct bfd_link_order *l; |
| 2694 | |
| 2695 | c = 0; |
| 2696 | for (l = link_order; l != NULL; l = l->next) |
| 2697 | { |
| 2698 | if (l->type == bfd_section_reloc_link_order |
| 2699 | || l->type == bfd_symbol_reloc_link_order) |
| 2700 | ++c; |
| 2701 | } |
| 2702 | |
| 2703 | return c; |
| 2704 | } |
| 2705 | |
| 2706 | /* |
| 2707 | FUNCTION |
| 2708 | bfd_link_split_section |
| 2709 | |
| 2710 | SYNOPSIS |
| 2711 | bfd_boolean bfd_link_split_section (bfd *abfd, asection *sec); |
| 2712 | |
| 2713 | DESCRIPTION |
| 2714 | Return nonzero if @var{sec} should be split during a |
| 2715 | reloceatable or final link. |
| 2716 | |
| 2717 | .#define bfd_link_split_section(abfd, sec) \ |
| 2718 | . BFD_SEND (abfd, _bfd_link_split_section, (abfd, sec)) |
| 2719 | . |
| 2720 | |
| 2721 | */ |
| 2722 | |
| 2723 | bfd_boolean |
| 2724 | _bfd_generic_link_split_section (bfd *abfd ATTRIBUTE_UNUSED, |
| 2725 | asection *sec ATTRIBUTE_UNUSED) |
| 2726 | { |
| 2727 | return FALSE; |
| 2728 | } |
| 2729 | |
| 2730 | /* |
| 2731 | FUNCTION |
| 2732 | bfd_section_already_linked |
| 2733 | |
| 2734 | SYNOPSIS |
| 2735 | bfd_boolean bfd_section_already_linked (bfd *abfd, |
| 2736 | asection *sec, |
| 2737 | struct bfd_link_info *info); |
| 2738 | |
| 2739 | DESCRIPTION |
| 2740 | Check if @var{data} has been already linked during a reloceatable |
| 2741 | or final link. Return TRUE if it has. |
| 2742 | |
| 2743 | .#define bfd_section_already_linked(abfd, sec, info) \ |
| 2744 | . BFD_SEND (abfd, _section_already_linked, (abfd, sec, info)) |
| 2745 | . |
| 2746 | |
| 2747 | */ |
| 2748 | |
| 2749 | /* Sections marked with the SEC_LINK_ONCE flag should only be linked |
| 2750 | once into the output. This routine checks each section, and |
| 2751 | arrange to discard it if a section of the same name has already |
| 2752 | been linked. This code assumes that all relevant sections have the |
| 2753 | SEC_LINK_ONCE flag set; that is, it does not depend solely upon the |
| 2754 | section name. bfd_section_already_linked is called via |
| 2755 | bfd_map_over_sections. */ |
| 2756 | |
| 2757 | /* The hash table. */ |
| 2758 | |
| 2759 | static struct bfd_hash_table _bfd_section_already_linked_table; |
| 2760 | |
| 2761 | /* Support routines for the hash table used by section_already_linked, |
| 2762 | initialize the table, traverse, lookup, fill in an entry and remove |
| 2763 | the table. */ |
| 2764 | |
| 2765 | void |
| 2766 | bfd_section_already_linked_table_traverse |
| 2767 | (bfd_boolean (*func) (struct bfd_section_already_linked_hash_entry *, |
| 2768 | void *), void *info) |
| 2769 | { |
| 2770 | bfd_hash_traverse (&_bfd_section_already_linked_table, |
| 2771 | (bfd_boolean (*) (struct bfd_hash_entry *, |
| 2772 | void *)) func, |
| 2773 | info); |
| 2774 | } |
| 2775 | |
| 2776 | struct bfd_section_already_linked_hash_entry * |
| 2777 | bfd_section_already_linked_table_lookup (const char *name) |
| 2778 | { |
| 2779 | return ((struct bfd_section_already_linked_hash_entry *) |
| 2780 | bfd_hash_lookup (&_bfd_section_already_linked_table, name, |
| 2781 | TRUE, FALSE)); |
| 2782 | } |
| 2783 | |
| 2784 | bfd_boolean |
| 2785 | bfd_section_already_linked_table_insert |
| 2786 | (struct bfd_section_already_linked_hash_entry *already_linked_list, |
| 2787 | asection *sec) |
| 2788 | { |
| 2789 | struct bfd_section_already_linked *l; |
| 2790 | |
| 2791 | /* Allocate the memory from the same obstack as the hash table is |
| 2792 | kept in. */ |
| 2793 | l = (struct bfd_section_already_linked *) |
| 2794 | bfd_hash_allocate (&_bfd_section_already_linked_table, sizeof *l); |
| 2795 | if (l == NULL) |
| 2796 | return FALSE; |
| 2797 | l->sec = sec; |
| 2798 | l->next = already_linked_list->entry; |
| 2799 | already_linked_list->entry = l; |
| 2800 | return TRUE; |
| 2801 | } |
| 2802 | |
| 2803 | static struct bfd_hash_entry * |
| 2804 | already_linked_newfunc (struct bfd_hash_entry *entry ATTRIBUTE_UNUSED, |
| 2805 | struct bfd_hash_table *table, |
| 2806 | const char *string ATTRIBUTE_UNUSED) |
| 2807 | { |
| 2808 | struct bfd_section_already_linked_hash_entry *ret = |
| 2809 | (struct bfd_section_already_linked_hash_entry *) |
| 2810 | bfd_hash_allocate (table, sizeof *ret); |
| 2811 | |
| 2812 | if (ret == NULL) |
| 2813 | return NULL; |
| 2814 | |
| 2815 | ret->entry = NULL; |
| 2816 | |
| 2817 | return &ret->root; |
| 2818 | } |
| 2819 | |
| 2820 | bfd_boolean |
| 2821 | bfd_section_already_linked_table_init (void) |
| 2822 | { |
| 2823 | return bfd_hash_table_init_n (&_bfd_section_already_linked_table, |
| 2824 | already_linked_newfunc, |
| 2825 | sizeof (struct bfd_section_already_linked_hash_entry), |
| 2826 | 42); |
| 2827 | } |
| 2828 | |
| 2829 | void |
| 2830 | bfd_section_already_linked_table_free (void) |
| 2831 | { |
| 2832 | bfd_hash_table_free (&_bfd_section_already_linked_table); |
| 2833 | } |
| 2834 | |
| 2835 | /* Report warnings as appropriate for duplicate section SEC. |
| 2836 | Return FALSE if we decide to keep SEC after all. */ |
| 2837 | |
| 2838 | bfd_boolean |
| 2839 | _bfd_handle_already_linked (asection *sec, |
| 2840 | struct bfd_section_already_linked *l, |
| 2841 | struct bfd_link_info *info) |
| 2842 | { |
| 2843 | switch (sec->flags & SEC_LINK_DUPLICATES) |
| 2844 | { |
| 2845 | default: |
| 2846 | abort (); |
| 2847 | |
| 2848 | case SEC_LINK_DUPLICATES_DISCARD: |
| 2849 | /* If we found an LTO IR match for this comdat group on |
| 2850 | the first pass, replace it with the LTO output on the |
| 2851 | second pass. We can't simply choose real object |
| 2852 | files over IR because the first pass may contain a |
| 2853 | mix of LTO and normal objects and we must keep the |
| 2854 | first match, be it IR or real. */ |
| 2855 | if (sec->owner->lto_output |
| 2856 | && (l->sec->owner->flags & BFD_PLUGIN) != 0) |
| 2857 | { |
| 2858 | l->sec = sec; |
| 2859 | return FALSE; |
| 2860 | } |
| 2861 | break; |
| 2862 | |
| 2863 | case SEC_LINK_DUPLICATES_ONE_ONLY: |
| 2864 | info->callbacks->einfo |
| 2865 | /* xgettext:c-format */ |
| 2866 | (_("%pB: ignoring duplicate section `%pA'\n"), |
| 2867 | sec->owner, sec); |
| 2868 | break; |
| 2869 | |
| 2870 | case SEC_LINK_DUPLICATES_SAME_SIZE: |
| 2871 | if ((l->sec->owner->flags & BFD_PLUGIN) != 0) |
| 2872 | ; |
| 2873 | else if (sec->size != l->sec->size) |
| 2874 | info->callbacks->einfo |
| 2875 | /* xgettext:c-format */ |
| 2876 | (_("%pB: duplicate section `%pA' has different size\n"), |
| 2877 | sec->owner, sec); |
| 2878 | break; |
| 2879 | |
| 2880 | case SEC_LINK_DUPLICATES_SAME_CONTENTS: |
| 2881 | if ((l->sec->owner->flags & BFD_PLUGIN) != 0) |
| 2882 | ; |
| 2883 | else if (sec->size != l->sec->size) |
| 2884 | info->callbacks->einfo |
| 2885 | /* xgettext:c-format */ |
| 2886 | (_("%pB: duplicate section `%pA' has different size\n"), |
| 2887 | sec->owner, sec); |
| 2888 | else if (sec->size != 0) |
| 2889 | { |
| 2890 | bfd_byte *sec_contents, *l_sec_contents = NULL; |
| 2891 | |
| 2892 | if (!bfd_malloc_and_get_section (sec->owner, sec, &sec_contents)) |
| 2893 | info->callbacks->einfo |
| 2894 | /* xgettext:c-format */ |
| 2895 | (_("%pB: could not read contents of section `%pA'\n"), |
| 2896 | sec->owner, sec); |
| 2897 | else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec, |
| 2898 | &l_sec_contents)) |
| 2899 | info->callbacks->einfo |
| 2900 | /* xgettext:c-format */ |
| 2901 | (_("%pB: could not read contents of section `%pA'\n"), |
| 2902 | l->sec->owner, l->sec); |
| 2903 | else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0) |
| 2904 | info->callbacks->einfo |
| 2905 | /* xgettext:c-format */ |
| 2906 | (_("%pB: duplicate section `%pA' has different contents\n"), |
| 2907 | sec->owner, sec); |
| 2908 | |
| 2909 | if (sec_contents) |
| 2910 | free (sec_contents); |
| 2911 | if (l_sec_contents) |
| 2912 | free (l_sec_contents); |
| 2913 | } |
| 2914 | break; |
| 2915 | } |
| 2916 | |
| 2917 | /* Set the output_section field so that lang_add_section |
| 2918 | does not create a lang_input_section structure for this |
| 2919 | section. Since there might be a symbol in the section |
| 2920 | being discarded, we must retain a pointer to the section |
| 2921 | which we are really going to use. */ |
| 2922 | sec->output_section = bfd_abs_section_ptr; |
| 2923 | sec->kept_section = l->sec; |
| 2924 | return TRUE; |
| 2925 | } |
| 2926 | |
| 2927 | /* This is used on non-ELF inputs. */ |
| 2928 | |
| 2929 | bfd_boolean |
| 2930 | _bfd_generic_section_already_linked (bfd *abfd ATTRIBUTE_UNUSED, |
| 2931 | asection *sec, |
| 2932 | struct bfd_link_info *info) |
| 2933 | { |
| 2934 | const char *name; |
| 2935 | struct bfd_section_already_linked *l; |
| 2936 | struct bfd_section_already_linked_hash_entry *already_linked_list; |
| 2937 | |
| 2938 | if ((sec->flags & SEC_LINK_ONCE) == 0) |
| 2939 | return FALSE; |
| 2940 | |
| 2941 | /* The generic linker doesn't handle section groups. */ |
| 2942 | if ((sec->flags & SEC_GROUP) != 0) |
| 2943 | return FALSE; |
| 2944 | |
| 2945 | /* FIXME: When doing a relocatable link, we may have trouble |
| 2946 | copying relocations in other sections that refer to local symbols |
| 2947 | in the section being discarded. Those relocations will have to |
| 2948 | be converted somehow; as of this writing I'm not sure that any of |
| 2949 | the backends handle that correctly. |
| 2950 | |
| 2951 | It is tempting to instead not discard link once sections when |
| 2952 | doing a relocatable link (technically, they should be discarded |
| 2953 | whenever we are building constructors). However, that fails, |
| 2954 | because the linker winds up combining all the link once sections |
| 2955 | into a single large link once section, which defeats the purpose |
| 2956 | of having link once sections in the first place. */ |
| 2957 | |
| 2958 | name = bfd_get_section_name (abfd, sec); |
| 2959 | |
| 2960 | already_linked_list = bfd_section_already_linked_table_lookup (name); |
| 2961 | |
| 2962 | l = already_linked_list->entry; |
| 2963 | if (l != NULL) |
| 2964 | { |
| 2965 | /* The section has already been linked. See if we should |
| 2966 | issue a warning. */ |
| 2967 | return _bfd_handle_already_linked (sec, l, info); |
| 2968 | } |
| 2969 | |
| 2970 | /* This is the first section with this name. Record it. */ |
| 2971 | if (!bfd_section_already_linked_table_insert (already_linked_list, sec)) |
| 2972 | info->callbacks->einfo (_("%F%P: already_linked_table: %E\n")); |
| 2973 | return FALSE; |
| 2974 | } |
| 2975 | |
| 2976 | /* Choose a neighbouring section to S in OBFD that will be output, or |
| 2977 | the absolute section if ADDR is out of bounds of the neighbours. */ |
| 2978 | |
| 2979 | asection * |
| 2980 | _bfd_nearby_section (bfd *obfd, asection *s, bfd_vma addr) |
| 2981 | { |
| 2982 | asection *next, *prev, *best; |
| 2983 | |
| 2984 | /* Find preceding kept section. */ |
| 2985 | for (prev = s->prev; prev != NULL; prev = prev->prev) |
| 2986 | if ((prev->flags & SEC_EXCLUDE) == 0 |
| 2987 | && !bfd_section_removed_from_list (obfd, prev)) |
| 2988 | break; |
| 2989 | |
| 2990 | /* Find following kept section. Start at prev->next because |
| 2991 | other sections may have been added after S was removed. */ |
| 2992 | if (s->prev != NULL) |
| 2993 | next = s->prev->next; |
| 2994 | else |
| 2995 | next = s->owner->sections; |
| 2996 | for (; next != NULL; next = next->next) |
| 2997 | if ((next->flags & SEC_EXCLUDE) == 0 |
| 2998 | && !bfd_section_removed_from_list (obfd, next)) |
| 2999 | break; |
| 3000 | |
| 3001 | /* Choose better of two sections, based on flags. The idea |
| 3002 | is to choose a section that will be in the same segment |
| 3003 | as S would have been if it was kept. */ |
| 3004 | best = next; |
| 3005 | if (prev == NULL) |
| 3006 | { |
| 3007 | if (next == NULL) |
| 3008 | best = bfd_abs_section_ptr; |
| 3009 | } |
| 3010 | else if (next == NULL) |
| 3011 | best = prev; |
| 3012 | else if (((prev->flags ^ next->flags) |
| 3013 | & (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_LOAD)) != 0) |
| 3014 | { |
| 3015 | if (((next->flags ^ s->flags) |
| 3016 | & (SEC_ALLOC | SEC_THREAD_LOCAL)) != 0 |
| 3017 | /* We prefer to choose a loaded section. Section S |
| 3018 | doesn't have SEC_LOAD set (it being excluded, that |
| 3019 | part of the flag processing didn't happen) so we |
| 3020 | can't compare that flag to those of NEXT and PREV. */ |
| 3021 | || ((prev->flags & SEC_LOAD) != 0 |
| 3022 | && (next->flags & SEC_LOAD) == 0)) |
| 3023 | best = prev; |
| 3024 | } |
| 3025 | else if (((prev->flags ^ next->flags) & SEC_READONLY) != 0) |
| 3026 | { |
| 3027 | if (((next->flags ^ s->flags) & SEC_READONLY) != 0) |
| 3028 | best = prev; |
| 3029 | } |
| 3030 | else if (((prev->flags ^ next->flags) & SEC_CODE) != 0) |
| 3031 | { |
| 3032 | if (((next->flags ^ s->flags) & SEC_CODE) != 0) |
| 3033 | best = prev; |
| 3034 | } |
| 3035 | else |
| 3036 | { |
| 3037 | /* Flags we care about are the same. Prefer the following |
| 3038 | section if that will result in a positive valued sym. */ |
| 3039 | if (addr < next->vma) |
| 3040 | best = prev; |
| 3041 | } |
| 3042 | |
| 3043 | return best; |
| 3044 | } |
| 3045 | |
| 3046 | /* Convert symbols in excluded output sections to use a kept section. */ |
| 3047 | |
| 3048 | static bfd_boolean |
| 3049 | fix_syms (struct bfd_link_hash_entry *h, void *data) |
| 3050 | { |
| 3051 | bfd *obfd = (bfd *) data; |
| 3052 | |
| 3053 | if (h->type == bfd_link_hash_defined |
| 3054 | || h->type == bfd_link_hash_defweak) |
| 3055 | { |
| 3056 | asection *s = h->u.def.section; |
| 3057 | if (s != NULL |
| 3058 | && s->output_section != NULL |
| 3059 | && (s->output_section->flags & SEC_EXCLUDE) != 0 |
| 3060 | && bfd_section_removed_from_list (obfd, s->output_section)) |
| 3061 | { |
| 3062 | asection *op; |
| 3063 | |
| 3064 | h->u.def.value += s->output_offset + s->output_section->vma; |
| 3065 | op = _bfd_nearby_section (obfd, s->output_section, h->u.def.value); |
| 3066 | h->u.def.value -= op->vma; |
| 3067 | h->u.def.section = op; |
| 3068 | } |
| 3069 | } |
| 3070 | |
| 3071 | return TRUE; |
| 3072 | } |
| 3073 | |
| 3074 | void |
| 3075 | _bfd_fix_excluded_sec_syms (bfd *obfd, struct bfd_link_info *info) |
| 3076 | { |
| 3077 | bfd_link_hash_traverse (info->hash, fix_syms, obfd); |
| 3078 | } |
| 3079 | |
| 3080 | /* |
| 3081 | FUNCTION |
| 3082 | bfd_generic_define_common_symbol |
| 3083 | |
| 3084 | SYNOPSIS |
| 3085 | bfd_boolean bfd_generic_define_common_symbol |
| 3086 | (bfd *output_bfd, struct bfd_link_info *info, |
| 3087 | struct bfd_link_hash_entry *h); |
| 3088 | |
| 3089 | DESCRIPTION |
| 3090 | Convert common symbol @var{h} into a defined symbol. |
| 3091 | Return TRUE on success and FALSE on failure. |
| 3092 | |
| 3093 | .#define bfd_define_common_symbol(output_bfd, info, h) \ |
| 3094 | . BFD_SEND (output_bfd, _bfd_define_common_symbol, (output_bfd, info, h)) |
| 3095 | . |
| 3096 | */ |
| 3097 | |
| 3098 | bfd_boolean |
| 3099 | bfd_generic_define_common_symbol (bfd *output_bfd, |
| 3100 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 3101 | struct bfd_link_hash_entry *h) |
| 3102 | { |
| 3103 | unsigned int power_of_two; |
| 3104 | bfd_vma alignment, size; |
| 3105 | asection *section; |
| 3106 | |
| 3107 | BFD_ASSERT (h != NULL && h->type == bfd_link_hash_common); |
| 3108 | |
| 3109 | size = h->u.c.size; |
| 3110 | power_of_two = h->u.c.p->alignment_power; |
| 3111 | section = h->u.c.p->section; |
| 3112 | |
| 3113 | /* Increase the size of the section to align the common symbol. |
| 3114 | The alignment must be a power of two. */ |
| 3115 | alignment = bfd_octets_per_byte (output_bfd) << power_of_two; |
| 3116 | BFD_ASSERT (alignment != 0 && (alignment & -alignment) == alignment); |
| 3117 | section->size += alignment - 1; |
| 3118 | section->size &= -alignment; |
| 3119 | |
| 3120 | /* Adjust the section's overall alignment if necessary. */ |
| 3121 | if (power_of_two > section->alignment_power) |
| 3122 | section->alignment_power = power_of_two; |
| 3123 | |
| 3124 | /* Change the symbol from common to defined. */ |
| 3125 | h->type = bfd_link_hash_defined; |
| 3126 | h->u.def.section = section; |
| 3127 | h->u.def.value = section->size; |
| 3128 | |
| 3129 | /* Increase the size of the section. */ |
| 3130 | section->size += size; |
| 3131 | |
| 3132 | /* Make sure the section is allocated in memory, and make sure that |
| 3133 | it is no longer a common section. */ |
| 3134 | section->flags |= SEC_ALLOC; |
| 3135 | section->flags &= ~(SEC_IS_COMMON | SEC_HAS_CONTENTS); |
| 3136 | return TRUE; |
| 3137 | } |
| 3138 | |
| 3139 | /* |
| 3140 | FUNCTION |
| 3141 | _bfd_generic_link_hide_symbol |
| 3142 | |
| 3143 | SYNOPSIS |
| 3144 | void _bfd_generic_link_hide_symbol |
| 3145 | (bfd *output_bfd, struct bfd_link_info *info, |
| 3146 | struct bfd_link_hash_entry *h); |
| 3147 | |
| 3148 | DESCRIPTION |
| 3149 | Hide symbol @var{h}. |
| 3150 | This is an internal function. It should not be called from |
| 3151 | outside the BFD library. |
| 3152 | |
| 3153 | .#define bfd_link_hide_symbol(output_bfd, info, h) \ |
| 3154 | . BFD_SEND (output_bfd, _bfd_link_hide_symbol, (output_bfd, info, h)) |
| 3155 | . |
| 3156 | */ |
| 3157 | |
| 3158 | void |
| 3159 | _bfd_generic_link_hide_symbol (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 3160 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 3161 | struct bfd_link_hash_entry *h ATTRIBUTE_UNUSED) |
| 3162 | { |
| 3163 | } |
| 3164 | |
| 3165 | /* |
| 3166 | FUNCTION |
| 3167 | bfd_generic_define_start_stop |
| 3168 | |
| 3169 | SYNOPSIS |
| 3170 | struct bfd_link_hash_entry *bfd_generic_define_start_stop |
| 3171 | (struct bfd_link_info *info, |
| 3172 | const char *symbol, asection *sec); |
| 3173 | |
| 3174 | DESCRIPTION |
| 3175 | Define a __start, __stop, .startof. or .sizeof. symbol. |
| 3176 | Return the symbol or NULL if no such undefined symbol exists. |
| 3177 | |
| 3178 | .#define bfd_define_start_stop(output_bfd, info, symbol, sec) \ |
| 3179 | . BFD_SEND (output_bfd, _bfd_define_start_stop, (info, symbol, sec)) |
| 3180 | . |
| 3181 | */ |
| 3182 | |
| 3183 | struct bfd_link_hash_entry * |
| 3184 | bfd_generic_define_start_stop (struct bfd_link_info *info, |
| 3185 | const char *symbol, asection *sec) |
| 3186 | { |
| 3187 | struct bfd_link_hash_entry *h; |
| 3188 | |
| 3189 | h = bfd_link_hash_lookup (info->hash, symbol, FALSE, FALSE, TRUE); |
| 3190 | if (h != NULL |
| 3191 | && (h->type == bfd_link_hash_undefined |
| 3192 | || h->type == bfd_link_hash_undefweak)) |
| 3193 | { |
| 3194 | h->type = bfd_link_hash_defined; |
| 3195 | h->u.def.section = sec; |
| 3196 | h->u.def.value = 0; |
| 3197 | return h; |
| 3198 | } |
| 3199 | return NULL; |
| 3200 | } |
| 3201 | |
| 3202 | /* |
| 3203 | FUNCTION |
| 3204 | bfd_find_version_for_sym |
| 3205 | |
| 3206 | SYNOPSIS |
| 3207 | struct bfd_elf_version_tree * bfd_find_version_for_sym |
| 3208 | (struct bfd_elf_version_tree *verdefs, |
| 3209 | const char *sym_name, bfd_boolean *hide); |
| 3210 | |
| 3211 | DESCRIPTION |
| 3212 | Search an elf version script tree for symbol versioning |
| 3213 | info and export / don't-export status for a given symbol. |
| 3214 | Return non-NULL on success and NULL on failure; also sets |
| 3215 | the output @samp{hide} boolean parameter. |
| 3216 | |
| 3217 | */ |
| 3218 | |
| 3219 | struct bfd_elf_version_tree * |
| 3220 | bfd_find_version_for_sym (struct bfd_elf_version_tree *verdefs, |
| 3221 | const char *sym_name, |
| 3222 | bfd_boolean *hide) |
| 3223 | { |
| 3224 | struct bfd_elf_version_tree *t; |
| 3225 | struct bfd_elf_version_tree *local_ver, *global_ver, *exist_ver; |
| 3226 | struct bfd_elf_version_tree *star_local_ver, *star_global_ver; |
| 3227 | |
| 3228 | local_ver = NULL; |
| 3229 | global_ver = NULL; |
| 3230 | star_local_ver = NULL; |
| 3231 | star_global_ver = NULL; |
| 3232 | exist_ver = NULL; |
| 3233 | for (t = verdefs; t != NULL; t = t->next) |
| 3234 | { |
| 3235 | if (t->globals.list != NULL) |
| 3236 | { |
| 3237 | struct bfd_elf_version_expr *d = NULL; |
| 3238 | |
| 3239 | while ((d = (*t->match) (&t->globals, d, sym_name)) != NULL) |
| 3240 | { |
| 3241 | if (d->literal || strcmp (d->pattern, "*") != 0) |
| 3242 | global_ver = t; |
| 3243 | else |
| 3244 | star_global_ver = t; |
| 3245 | if (d->symver) |
| 3246 | exist_ver = t; |
| 3247 | d->script = 1; |
| 3248 | /* If the match is a wildcard pattern, keep looking for |
| 3249 | a more explicit, perhaps even local, match. */ |
| 3250 | if (d->literal) |
| 3251 | break; |
| 3252 | } |
| 3253 | |
| 3254 | if (d != NULL) |
| 3255 | break; |
| 3256 | } |
| 3257 | |
| 3258 | if (t->locals.list != NULL) |
| 3259 | { |
| 3260 | struct bfd_elf_version_expr *d = NULL; |
| 3261 | |
| 3262 | while ((d = (*t->match) (&t->locals, d, sym_name)) != NULL) |
| 3263 | { |
| 3264 | if (d->literal || strcmp (d->pattern, "*") != 0) |
| 3265 | local_ver = t; |
| 3266 | else |
| 3267 | star_local_ver = t; |
| 3268 | /* If the match is a wildcard pattern, keep looking for |
| 3269 | a more explicit, perhaps even global, match. */ |
| 3270 | if (d->literal) |
| 3271 | { |
| 3272 | /* An exact match overrides a global wildcard. */ |
| 3273 | global_ver = NULL; |
| 3274 | star_global_ver = NULL; |
| 3275 | break; |
| 3276 | } |
| 3277 | } |
| 3278 | |
| 3279 | if (d != NULL) |
| 3280 | break; |
| 3281 | } |
| 3282 | } |
| 3283 | |
| 3284 | if (global_ver == NULL && local_ver == NULL) |
| 3285 | global_ver = star_global_ver; |
| 3286 | |
| 3287 | if (global_ver != NULL) |
| 3288 | { |
| 3289 | /* If we already have a versioned symbol that matches the |
| 3290 | node for this symbol, then we don't want to create a |
| 3291 | duplicate from the unversioned symbol. Instead hide the |
| 3292 | unversioned symbol. */ |
| 3293 | *hide = exist_ver == global_ver; |
| 3294 | return global_ver; |
| 3295 | } |
| 3296 | |
| 3297 | if (local_ver == NULL) |
| 3298 | local_ver = star_local_ver; |
| 3299 | |
| 3300 | if (local_ver != NULL) |
| 3301 | { |
| 3302 | *hide = TRUE; |
| 3303 | return local_ver; |
| 3304 | } |
| 3305 | |
| 3306 | return NULL; |
| 3307 | } |
| 3308 | |
| 3309 | /* |
| 3310 | FUNCTION |
| 3311 | bfd_hide_sym_by_version |
| 3312 | |
| 3313 | SYNOPSIS |
| 3314 | bfd_boolean bfd_hide_sym_by_version |
| 3315 | (struct bfd_elf_version_tree *verdefs, const char *sym_name); |
| 3316 | |
| 3317 | DESCRIPTION |
| 3318 | Search an elf version script tree for symbol versioning |
| 3319 | info for a given symbol. Return TRUE if the symbol is hidden. |
| 3320 | |
| 3321 | */ |
| 3322 | |
| 3323 | bfd_boolean |
| 3324 | bfd_hide_sym_by_version (struct bfd_elf_version_tree *verdefs, |
| 3325 | const char *sym_name) |
| 3326 | { |
| 3327 | bfd_boolean hidden = FALSE; |
| 3328 | bfd_find_version_for_sym (verdefs, sym_name, &hidden); |
| 3329 | return hidden; |
| 3330 | } |
| 3331 | |
| 3332 | /* |
| 3333 | FUNCTION |
| 3334 | bfd_link_check_relocs |
| 3335 | |
| 3336 | SYNOPSIS |
| 3337 | bfd_boolean bfd_link_check_relocs |
| 3338 | (bfd *abfd, struct bfd_link_info *info); |
| 3339 | |
| 3340 | DESCRIPTION |
| 3341 | Checks the relocs in ABFD for validity. |
| 3342 | Does not execute the relocs. |
| 3343 | Return TRUE if everything is OK, FALSE otherwise. |
| 3344 | This is the external entry point to this code. |
| 3345 | */ |
| 3346 | |
| 3347 | bfd_boolean |
| 3348 | bfd_link_check_relocs (bfd *abfd, struct bfd_link_info *info) |
| 3349 | { |
| 3350 | return BFD_SEND (abfd, _bfd_link_check_relocs, (abfd, info)); |
| 3351 | } |
| 3352 | |
| 3353 | /* |
| 3354 | FUNCTION |
| 3355 | _bfd_generic_link_check_relocs |
| 3356 | |
| 3357 | SYNOPSIS |
| 3358 | bfd_boolean _bfd_generic_link_check_relocs |
| 3359 | (bfd *abfd, struct bfd_link_info *info); |
| 3360 | |
| 3361 | DESCRIPTION |
| 3362 | Stub function for targets that do not implement reloc checking. |
| 3363 | Return TRUE. |
| 3364 | This is an internal function. It should not be called from |
| 3365 | outside the BFD library. |
| 3366 | */ |
| 3367 | |
| 3368 | bfd_boolean |
| 3369 | _bfd_generic_link_check_relocs (bfd *abfd ATTRIBUTE_UNUSED, |
| 3370 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 3371 | { |
| 3372 | return TRUE; |
| 3373 | } |
| 3374 | |
| 3375 | /* |
| 3376 | FUNCTION |
| 3377 | bfd_merge_private_bfd_data |
| 3378 | |
| 3379 | SYNOPSIS |
| 3380 | bfd_boolean bfd_merge_private_bfd_data |
| 3381 | (bfd *ibfd, struct bfd_link_info *info); |
| 3382 | |
| 3383 | DESCRIPTION |
| 3384 | Merge private BFD information from the BFD @var{ibfd} to the |
| 3385 | the output file BFD when linking. Return <<TRUE>> on success, |
| 3386 | <<FALSE>> on error. Possible error returns are: |
| 3387 | |
| 3388 | o <<bfd_error_no_memory>> - |
| 3389 | Not enough memory exists to create private data for @var{obfd}. |
| 3390 | |
| 3391 | .#define bfd_merge_private_bfd_data(ibfd, info) \ |
| 3392 | . BFD_SEND ((info)->output_bfd, _bfd_merge_private_bfd_data, \ |
| 3393 | . (ibfd, info)) |
| 3394 | */ |
| 3395 | |
| 3396 | /* |
| 3397 | INTERNAL_FUNCTION |
| 3398 | _bfd_generic_verify_endian_match |
| 3399 | |
| 3400 | SYNOPSIS |
| 3401 | bfd_boolean _bfd_generic_verify_endian_match |
| 3402 | (bfd *ibfd, struct bfd_link_info *info); |
| 3403 | |
| 3404 | DESCRIPTION |
| 3405 | Can be used from / for bfd_merge_private_bfd_data to check that |
| 3406 | endianness matches between input and output file. Returns |
| 3407 | TRUE for a match, otherwise returns FALSE and emits an error. |
| 3408 | */ |
| 3409 | |
| 3410 | bfd_boolean |
| 3411 | _bfd_generic_verify_endian_match (bfd *ibfd, struct bfd_link_info *info) |
| 3412 | { |
| 3413 | bfd *obfd = info->output_bfd; |
| 3414 | |
| 3415 | if (ibfd->xvec->byteorder != obfd->xvec->byteorder |
| 3416 | && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN |
| 3417 | && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) |
| 3418 | { |
| 3419 | if (bfd_big_endian (ibfd)) |
| 3420 | _bfd_error_handler (_("%pB: compiled for a big endian system " |
| 3421 | "and target is little endian"), ibfd); |
| 3422 | else |
| 3423 | _bfd_error_handler (_("%pB: compiled for a little endian system " |
| 3424 | "and target is big endian"), ibfd); |
| 3425 | bfd_set_error (bfd_error_wrong_format); |
| 3426 | return FALSE; |
| 3427 | } |
| 3428 | |
| 3429 | return TRUE; |
| 3430 | } |
| 3431 | |
| 3432 | int |
| 3433 | _bfd_nolink_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED, |
| 3434 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 3435 | { |
| 3436 | return 0; |
| 3437 | } |
| 3438 | |
| 3439 | bfd_boolean |
| 3440 | _bfd_nolink_bfd_relax_section (bfd *abfd, |
| 3441 | asection *section ATTRIBUTE_UNUSED, |
| 3442 | struct bfd_link_info *link_info ATTRIBUTE_UNUSED, |
| 3443 | bfd_boolean *again ATTRIBUTE_UNUSED) |
| 3444 | { |
| 3445 | return _bfd_bool_bfd_false_error (abfd); |
| 3446 | } |
| 3447 | |
| 3448 | bfd_byte * |
| 3449 | _bfd_nolink_bfd_get_relocated_section_contents |
| 3450 | (bfd *abfd, |
| 3451 | struct bfd_link_info *link_info ATTRIBUTE_UNUSED, |
| 3452 | struct bfd_link_order *link_order ATTRIBUTE_UNUSED, |
| 3453 | bfd_byte *data ATTRIBUTE_UNUSED, |
| 3454 | bfd_boolean relocatable ATTRIBUTE_UNUSED, |
| 3455 | asymbol **symbols ATTRIBUTE_UNUSED) |
| 3456 | { |
| 3457 | return (bfd_byte *) _bfd_ptr_bfd_null_error (abfd); |
| 3458 | } |
| 3459 | |
| 3460 | bfd_boolean |
| 3461 | _bfd_nolink_bfd_lookup_section_flags |
| 3462 | (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 3463 | struct flag_info *flaginfo ATTRIBUTE_UNUSED, |
| 3464 | asection *section) |
| 3465 | { |
| 3466 | return _bfd_bool_bfd_false_error (section->owner); |
| 3467 | } |
| 3468 | |
| 3469 | bfd_boolean |
| 3470 | _bfd_nolink_bfd_is_group_section (bfd *abfd, |
| 3471 | const asection *sec ATTRIBUTE_UNUSED) |
| 3472 | { |
| 3473 | return _bfd_bool_bfd_false_error (abfd); |
| 3474 | } |
| 3475 | |
| 3476 | bfd_boolean |
| 3477 | _bfd_nolink_bfd_discard_group (bfd *abfd, asection *sec ATTRIBUTE_UNUSED) |
| 3478 | { |
| 3479 | return _bfd_bool_bfd_false_error (abfd); |
| 3480 | } |
| 3481 | |
| 3482 | struct bfd_link_hash_table * |
| 3483 | _bfd_nolink_bfd_link_hash_table_create (bfd *abfd) |
| 3484 | { |
| 3485 | return (struct bfd_link_hash_table *) _bfd_ptr_bfd_null_error (abfd); |
| 3486 | } |
| 3487 | |
| 3488 | void |
| 3489 | _bfd_nolink_bfd_link_just_syms (asection *sec ATTRIBUTE_UNUSED, |
| 3490 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 3491 | { |
| 3492 | } |
| 3493 | |
| 3494 | void |
| 3495 | _bfd_nolink_bfd_copy_link_hash_symbol_type |
| 3496 | (bfd *abfd ATTRIBUTE_UNUSED, |
| 3497 | struct bfd_link_hash_entry *from ATTRIBUTE_UNUSED, |
| 3498 | struct bfd_link_hash_entry *to ATTRIBUTE_UNUSED) |
| 3499 | { |
| 3500 | } |
| 3501 | |
| 3502 | bfd_boolean |
| 3503 | _bfd_nolink_bfd_link_split_section (bfd *abfd, asection *sec ATTRIBUTE_UNUSED) |
| 3504 | { |
| 3505 | return _bfd_bool_bfd_false_error (abfd); |
| 3506 | } |
| 3507 | |
| 3508 | bfd_boolean |
| 3509 | _bfd_nolink_section_already_linked (bfd *abfd, |
| 3510 | asection *sec ATTRIBUTE_UNUSED, |
| 3511 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 3512 | { |
| 3513 | return _bfd_bool_bfd_false_error (abfd); |
| 3514 | } |
| 3515 | |
| 3516 | bfd_boolean |
| 3517 | _bfd_nolink_bfd_define_common_symbol |
| 3518 | (bfd *abfd, |
| 3519 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 3520 | struct bfd_link_hash_entry *h ATTRIBUTE_UNUSED) |
| 3521 | { |
| 3522 | return _bfd_bool_bfd_false_error (abfd); |
| 3523 | } |
| 3524 | |
| 3525 | struct bfd_link_hash_entry * |
| 3526 | _bfd_nolink_bfd_define_start_stop (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 3527 | const char *name ATTRIBUTE_UNUSED, |
| 3528 | asection *sec) |
| 3529 | { |
| 3530 | return (struct bfd_link_hash_entry *) _bfd_ptr_bfd_null_error (sec->owner); |
| 3531 | } |