1 /* linker.c -- BFD linker routines
2 Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
3 Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support
5 This file is part of BFD, the Binary File Descriptor library.
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 2 of the License, or
10 (at your option) any later version.
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.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
32 The linker uses three special entry points in the BFD target
33 vector. It is not necessary to write special routines for
34 these entry points when creating a new BFD back end, since
35 generic versions are provided. However, writing them can
36 speed up linking and make it use significantly less runtime
39 The first routine creates a hash table used by the other
40 routines. The second routine adds the symbols from an object
41 file to the hash table. The third routine takes all the
42 object files and links them together to create the output
43 file. These routines are designed so that the linker proper
44 does not need to know anything about the symbols in the object
45 files that it is linking. The linker merely arranges the
46 sections as directed by the linker script and lets BFD handle
47 the details of symbols and relocs.
49 The second routine and third routines are passed a pointer to
50 a <<struct bfd_link_info>> structure (defined in
51 <<bfdlink.h>>) which holds information relevant to the link,
52 including the linker hash table (which was created by the
53 first routine) and a set of callback functions to the linker
56 The generic linker routines are in <<linker.c>>, and use the
57 header file <<genlink.h>>. As of this writing, the only back
58 ends which have implemented versions of these routines are
59 a.out (in <<aoutx.h>>) and ECOFF (in <<ecoff.c>>). The a.out
60 routines are used as examples throughout this section.
63 @* Creating a Linker Hash Table::
64 @* Adding Symbols to the Hash Table::
65 @* Performing the Final Link::
69 Creating a Linker Hash Table, Adding Symbols to the Hash Table, Linker Functions, Linker Functions
71 Creating a linker hash table
73 @cindex _bfd_link_hash_table_create in target vector
74 @cindex target vector (_bfd_link_hash_table_create)
75 The linker routines must create a hash table, which must be
76 derived from <<struct bfd_link_hash_table>> described in
77 <<bfdlink.c>>. @xref{Hash Tables} for information on how to
78 create a derived hash table. This entry point is called using
79 the target vector of the linker output file.
81 The <<_bfd_link_hash_table_create>> entry point must allocate
82 and initialize an instance of the desired hash table. If the
83 back end does not require any additional information to be
84 stored with the entries in the hash table, the entry point may
85 simply create a <<struct bfd_link_hash_table>>. Most likely,
86 however, some additional information will be needed.
88 For example, with each entry in the hash table the a.out
89 linker keeps the index the symbol has in the final output file
90 (this index number is used so that when doing a relocateable
91 link the symbol index used in the output file can be quickly
92 filled in when copying over a reloc). The a.out linker code
93 defines the required structures and functions for a hash table
94 derived from <<struct bfd_link_hash_table>>. The a.out linker
95 hash table is created by the function
96 <<NAME(aout,link_hash_table_create)>>; it simply allocates
97 space for the hash table, initializes it, and returns a
100 When writing the linker routines for a new back end, you will
101 generally not know exactly which fields will be required until
102 you have finished. You should simply create a new hash table
103 which defines no additional fields, and then simply add fields
104 as they become necessary.
107 Adding Symbols to the Hash Table, Performing the Final Link, Creating a Linker Hash Table, Linker Functions
109 Adding symbols to the hash table
111 @cindex _bfd_link_add_symbols in target vector
112 @cindex target vector (_bfd_link_add_symbols)
113 The linker proper will call the <<_bfd_link_add_symbols>>
114 entry point for each object file or archive which is to be
115 linked (typically these are the files named on the command
116 line, but some may also come from the linker script). The
117 entry point is responsible for examining the file. For an
118 object file, BFD must add any relevant symbol information to
119 the hash table. For an archive, BFD must determine which
120 elements of the archive should be used and adding them to the
123 The a.out version of this entry point is
124 <<NAME(aout,link_add_symbols)>>.
127 @* Differing file formats::
128 @* Adding symbols from an object file::
129 @* Adding symbols from an archive::
133 Differing file formats, Adding symbols from an object file, Adding Symbols to the Hash Table, Adding Symbols to the Hash Table
135 Differing file formats
137 Normally all the files involved in a link will be of the same
138 format, but it is also possible to link together different
139 format object files, and the back end must support that. The
140 <<_bfd_link_add_symbols>> entry point is called via the target
141 vector of the file to be added. This has an important
142 consequence: the function may not assume that the hash table
143 is the type created by the corresponding
144 <<_bfd_link_hash_table_create>> vector. All the
145 <<_bfd_link_add_symbols>> function can assume about the hash
146 table is that it is derived from <<struct
147 bfd_link_hash_table>>.
149 Sometimes the <<_bfd_link_add_symbols>> function must store
150 some information in the hash table entry to be used by the
151 <<_bfd_final_link>> function. In such a case the <<creator>>
152 field of the hash table must be checked to make sure that the
153 hash table was created by an object file of the same format.
155 The <<_bfd_final_link>> routine must be prepared to handle a
156 hash entry without any extra information added by the
157 <<_bfd_link_add_symbols>> function. A hash entry without
158 extra information will also occur when the linker script
159 directs the linker to create a symbol. Note that, regardless
160 of how a hash table entry is added, all the fields will be
161 initialized to some sort of null value by the hash table entry
162 initialization function.
164 See <<ecoff_link_add_externals>> for an example of how to
165 check the <<creator>> field before saving information (in this
166 case, the ECOFF external symbol debugging information) in a
170 Adding symbols from an object file, Adding symbols from an archive, Differing file formats, Adding Symbols to the Hash Table
172 Adding symbols from an object file
174 When the <<_bfd_link_add_symbols>> routine is passed an object
175 file, it must add all externally visible symbols in that
176 object file to the hash table. The actual work of adding the
177 symbol to the hash table is normally handled by the function
178 <<_bfd_generic_link_add_one_symbol>>. The
179 <<_bfd_link_add_symbols>> routine is responsible for reading
180 all the symbols from the object file and passing the correct
181 information to <<_bfd_generic_link_add_one_symbol>>.
183 The <<_bfd_link_add_symbols>> routine should not use
184 <<bfd_canonicalize_symtab>> to read the symbols. The point of
185 providing this routine is to avoid the overhead of converting
186 the symbols into generic <<asymbol>> structures.
188 @findex _bfd_generic_link_add_one_symbol
189 <<_bfd_generic_link_add_one_symbol>> handles the details of
190 combining common symbols, warning about multiple definitions,
191 and so forth. It takes arguments which describe the symbol to
192 add, notably symbol flags, a section, and an offset. The
193 symbol flags include such things as <<BSF_WEAK>> or
194 <<BSF_INDIRECT>>. The section is a section in the object
195 file, or something like <<bfd_und_section_ptr>> for an undefined
196 symbol or <<bfd_com_section_ptr>> for a common symbol.
198 If the <<_bfd_final_link>> routine is also going to need to
199 read the symbol information, the <<_bfd_link_add_symbols>>
200 routine should save it somewhere attached to the object file
201 BFD. However, the information should only be saved if the
202 <<keep_memory>> field of the <<info>> argument is true, so
203 that the <<-no-keep-memory>> linker switch is effective.
205 The a.out function which adds symbols from an object file is
206 <<aout_link_add_object_symbols>>, and most of the interesting
207 work is in <<aout_link_add_symbols>>. The latter saves
208 pointers to the hash tables entries created by
209 <<_bfd_generic_link_add_one_symbol>> indexed by symbol number,
210 so that the <<_bfd_final_link>> routine does not have to call
211 the hash table lookup routine to locate the entry.
214 Adding symbols from an archive, , Adding symbols from an object file, Adding Symbols to the Hash Table
216 Adding symbols from an archive
218 When the <<_bfd_link_add_symbols>> routine is passed an
219 archive, it must look through the symbols defined by the
220 archive and decide which elements of the archive should be
221 included in the link. For each such element it must call the
222 <<add_archive_element>> linker callback, and it must add the
223 symbols from the object file to the linker hash table.
225 @findex _bfd_generic_link_add_archive_symbols
226 In most cases the work of looking through the symbols in the
227 archive should be done by the
228 <<_bfd_generic_link_add_archive_symbols>> function. This
229 function builds a hash table from the archive symbol table and
230 looks through the list of undefined symbols to see which
231 elements should be included.
232 <<_bfd_generic_link_add_archive_symbols>> is passed a function
233 to call to make the final decision about adding an archive
234 element to the link and to do the actual work of adding the
235 symbols to the linker hash table.
237 The function passed to
238 <<_bfd_generic_link_add_archive_symbols>> must read the
239 symbols of the archive element and decide whether the archive
240 element should be included in the link. If the element is to
241 be included, the <<add_archive_element>> linker callback
242 routine must be called with the element as an argument, and
243 the elements symbols must be added to the linker hash table
244 just as though the element had itself been passed to the
245 <<_bfd_link_add_symbols>> function.
247 When the a.out <<_bfd_link_add_symbols>> function receives an
248 archive, it calls <<_bfd_generic_link_add_archive_symbols>>
249 passing <<aout_link_check_archive_element>> as the function
250 argument. <<aout_link_check_archive_element>> calls
251 <<aout_link_check_ar_symbols>>. If the latter decides to add
252 the element (an element is only added if it provides a real,
253 non-common, definition for a previously undefined or common
254 symbol) it calls the <<add_archive_element>> callback and then
255 <<aout_link_check_archive_element>> calls
256 <<aout_link_add_symbols>> to actually add the symbols to the
259 The ECOFF back end is unusual in that it does not normally
260 call <<_bfd_generic_link_add_archive_symbols>>, because ECOFF
261 archives already contain a hash table of symbols. The ECOFF
262 back end searches the archive itself to avoid the overhead of
263 creating a new hash table.
266 Performing the Final Link, , Adding Symbols to the Hash Table, Linker Functions
268 Performing the final link
270 @cindex _bfd_link_final_link in target vector
271 @cindex target vector (_bfd_final_link)
272 When all the input files have been processed, the linker calls
273 the <<_bfd_final_link>> entry point of the output BFD. This
274 routine is responsible for producing the final output file,
275 which has several aspects. It must relocate the contents of
276 the input sections and copy the data into the output sections.
277 It must build an output symbol table including any local
278 symbols from the input files and the global symbols from the
279 hash table. When producing relocateable output, it must
280 modify the input relocs and write them into the output file.
281 There may also be object format dependent work to be done.
283 The linker will also call the <<write_object_contents>> entry
284 point when the BFD is closed. The two entry points must work
285 together in order to produce the correct output file.
287 The details of how this works are inevitably dependent upon
288 the specific object file format. The a.out
289 <<_bfd_final_link>> routine is <<NAME(aout,final_link)>>.
292 @* Information provided by the linker::
293 @* Relocating the section contents::
294 @* Writing the symbol table::
298 Information provided by the linker, Relocating the section contents, Performing the Final Link, Performing the Final Link
300 Information provided by the linker
302 Before the linker calls the <<_bfd_final_link>> entry point,
303 it sets up some data structures for the function to use.
305 The <<input_bfds>> field of the <<bfd_link_info>> structure
306 will point to a list of all the input files included in the
307 link. These files are linked through the <<link_next>> field
308 of the <<bfd>> structure.
310 Each section in the output file will have a list of
311 <<link_order>> structures attached to the <<link_order_head>>
312 field (the <<link_order>> structure is defined in
313 <<bfdlink.h>>). These structures describe how to create the
314 contents of the output section in terms of the contents of
315 various input sections, fill constants, and, eventually, other
316 types of information. They also describe relocs that must be
317 created by the BFD backend, but do not correspond to any input
318 file; this is used to support -Ur, which builds constructors
319 while generating a relocateable object file.
322 Relocating the section contents, Writing the symbol table, Information provided by the linker, Performing the Final Link
324 Relocating the section contents
326 The <<_bfd_final_link>> function should look through the
327 <<link_order>> structures attached to each section of the
328 output file. Each <<link_order>> structure should either be
329 handled specially, or it should be passed to the function
330 <<_bfd_default_link_order>> which will do the right thing
331 (<<_bfd_default_link_order>> is defined in <<linker.c>>).
333 For efficiency, a <<link_order>> of type
334 <<bfd_indirect_link_order>> whose associated section belongs
335 to a BFD of the same format as the output BFD must be handled
336 specially. This type of <<link_order>> describes part of an
337 output section in terms of a section belonging to one of the
338 input files. The <<_bfd_final_link>> function should read the
339 contents of the section and any associated relocs, apply the
340 relocs to the section contents, and write out the modified
341 section contents. If performing a relocateable link, the
342 relocs themselves must also be modified and written out.
344 @findex _bfd_relocate_contents
345 @findex _bfd_final_link_relocate
346 The functions <<_bfd_relocate_contents>> and
347 <<_bfd_final_link_relocate>> provide some general support for
348 performing the actual relocations, notably overflow checking.
349 Their arguments include information about the symbol the
350 relocation is against and a <<reloc_howto_type>> argument
351 which describes the relocation to perform. These functions
352 are defined in <<reloc.c>>.
354 The a.out function which handles reading, relocating, and
355 writing section contents is <<aout_link_input_section>>. The
356 actual relocation is done in <<aout_link_input_section_std>>
357 and <<aout_link_input_section_ext>>.
360 Writing the symbol table, , Relocating the section contents, Performing the Final Link
362 Writing the symbol table
364 The <<_bfd_final_link>> function must gather all the symbols
365 in the input files and write them out. It must also write out
366 all the symbols in the global hash table. This must be
367 controlled by the <<strip>> and <<discard>> fields of the
368 <<bfd_link_info>> structure.
370 The local symbols of the input files will not have been
371 entered into the linker hash table. The <<_bfd_final_link>>
372 routine must consider each input file and include the symbols
373 in the output file. It may be convenient to do this when
374 looking through the <<link_order>> structures, or it may be
375 done by stepping through the <<input_bfds>> list.
377 The <<_bfd_final_link>> routine must also traverse the global
378 hash table to gather all the externally visible symbols. It
379 is possible that most of the externally visible symbols may be
380 written out when considering the symbols of each input file,
381 but it is still necessary to traverse the hash table since the
382 linker script may have defined some symbols that are not in
383 any of the input files.
385 The <<strip>> field of the <<bfd_link_info>> structure
386 controls which symbols are written out. The possible values
387 are listed in <<bfdlink.h>>. If the value is <<strip_some>>,
388 then the <<keep_hash>> field of the <<bfd_link_info>>
389 structure is a hash table of symbols to keep; each symbol
390 should be looked up in this hash table, and only symbols which
391 are present should be included in the output file.
393 If the <<strip>> field of the <<bfd_link_info>> structure
394 permits local symbols to be written out, the <<discard>> field
395 is used to further controls which local symbols are included
396 in the output file. If the value is <<discard_l>>, then all
397 local symbols which begin with a certain prefix are discarded;
398 this prefix is described by the <<lprefix>> and
399 <<lprefix_len>> fields of the <<bfd_link_info>> structure.
401 The a.out backend handles symbols by calling
402 <<aout_link_write_symbols>> on each input BFD and then
403 traversing the global hash table with the function
404 <<aout_link_write_other_symbol>>. It builds a string table
405 while writing out the symbols, which is written to the output
406 file at the end of <<NAME(aout,final_link)>>.
409 static struct bfd_hash_entry
*generic_link_hash_newfunc
410 PARAMS ((struct bfd_hash_entry
*, struct bfd_hash_table
*,
412 static boolean generic_link_read_symbols
414 static boolean generic_link_add_symbols
415 PARAMS ((bfd
*, struct bfd_link_info
*, boolean collect
));
416 static boolean generic_link_add_object_symbols
417 PARAMS ((bfd
*, struct bfd_link_info
*, boolean collect
));
418 static boolean generic_link_check_archive_element_no_collect
419 PARAMS ((bfd
*, struct bfd_link_info
*, boolean
*pneeded
));
420 static boolean generic_link_check_archive_element_collect
421 PARAMS ((bfd
*, struct bfd_link_info
*, boolean
*pneeded
));
422 static boolean generic_link_check_archive_element
423 PARAMS ((bfd
*, struct bfd_link_info
*, boolean
*pneeded
, boolean collect
));
424 static boolean generic_link_add_symbol_list
425 PARAMS ((bfd
*, struct bfd_link_info
*, bfd_size_type count
, asymbol
**,
427 static void set_symbol_from_hash
428 PARAMS ((asymbol
*, struct bfd_link_hash_entry
*));
429 static boolean generic_add_output_symbol
430 PARAMS ((bfd
*, size_t *psymalloc
, asymbol
*));
431 static boolean default_fill_link_order
432 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
433 struct bfd_link_order
*));
434 static boolean default_indirect_link_order
435 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
436 struct bfd_link_order
*, boolean
));
438 /* The link hash table structure is defined in bfdlink.h. It provides
439 a base hash table which the backend specific hash tables are built
442 /* Routine to create an entry in the link hash table. */
444 struct bfd_hash_entry
*
445 _bfd_link_hash_newfunc (entry
, table
, string
)
446 struct bfd_hash_entry
*entry
;
447 struct bfd_hash_table
*table
;
450 struct bfd_link_hash_entry
*ret
= (struct bfd_link_hash_entry
*) entry
;
452 /* Allocate the structure if it has not already been allocated by a
454 if (ret
== (struct bfd_link_hash_entry
*) NULL
)
455 ret
= ((struct bfd_link_hash_entry
*)
456 bfd_hash_allocate (table
, sizeof (struct bfd_link_hash_entry
)));
457 if (ret
== (struct bfd_link_hash_entry
*) NULL
)
459 bfd_set_error (bfd_error_no_memory
);
463 /* Call the allocation method of the superclass. */
464 ret
= ((struct bfd_link_hash_entry
*)
465 bfd_hash_newfunc ((struct bfd_hash_entry
*) ret
, table
, string
));
469 /* Initialize the local fields. */
470 ret
->type
= bfd_link_hash_new
;
474 return (struct bfd_hash_entry
*) ret
;
477 /* Initialize a link hash table. The BFD argument is the one
478 responsible for creating this table. */
481 _bfd_link_hash_table_init (table
, abfd
, newfunc
)
482 struct bfd_link_hash_table
*table
;
484 struct bfd_hash_entry
*(*newfunc
) PARAMS ((struct bfd_hash_entry
*,
485 struct bfd_hash_table
*,
488 table
->creator
= abfd
->xvec
;
489 table
->undefs
= NULL
;
490 table
->undefs_tail
= NULL
;
491 return bfd_hash_table_init (&table
->table
, newfunc
);
494 /* Look up a symbol in a link hash table. If follow is true, we
495 follow bfd_link_hash_indirect and bfd_link_hash_warning links to
498 struct bfd_link_hash_entry
*
499 bfd_link_hash_lookup (table
, string
, create
, copy
, follow
)
500 struct bfd_link_hash_table
*table
;
506 struct bfd_link_hash_entry
*ret
;
508 ret
= ((struct bfd_link_hash_entry
*)
509 bfd_hash_lookup (&table
->table
, string
, create
, copy
));
511 if (follow
&& ret
!= (struct bfd_link_hash_entry
*) NULL
)
513 while (ret
->type
== bfd_link_hash_indirect
514 || ret
->type
== bfd_link_hash_warning
)
521 /* Traverse a generic link hash table. The only reason this is not a
522 macro is to do better type checking. This code presumes that an
523 argument passed as a struct bfd_hash_entry * may be caught as a
524 struct bfd_link_hash_entry * with no explicit cast required on the
528 bfd_link_hash_traverse (table
, func
, info
)
529 struct bfd_link_hash_table
*table
;
530 boolean (*func
) PARAMS ((struct bfd_link_hash_entry
*, PTR
));
533 bfd_hash_traverse (&table
->table
,
534 ((boolean (*) PARAMS ((struct bfd_hash_entry
*, PTR
)))
539 /* Add a symbol to the linker hash table undefs list. */
542 bfd_link_add_undef (table
, h
)
543 struct bfd_link_hash_table
*table
;
544 struct bfd_link_hash_entry
*h
;
546 BFD_ASSERT (h
->next
== NULL
);
547 if (table
->undefs_tail
!= (struct bfd_link_hash_entry
*) NULL
)
548 table
->undefs_tail
->next
= h
;
549 if (table
->undefs
== (struct bfd_link_hash_entry
*) NULL
)
551 table
->undefs_tail
= h
;
554 /* Routine to create an entry in an generic link hash table. */
556 static struct bfd_hash_entry
*
557 generic_link_hash_newfunc (entry
, table
, string
)
558 struct bfd_hash_entry
*entry
;
559 struct bfd_hash_table
*table
;
562 struct generic_link_hash_entry
*ret
=
563 (struct generic_link_hash_entry
*) entry
;
565 /* Allocate the structure if it has not already been allocated by a
567 if (ret
== (struct generic_link_hash_entry
*) NULL
)
568 ret
= ((struct generic_link_hash_entry
*)
569 bfd_hash_allocate (table
, sizeof (struct generic_link_hash_entry
)));
570 if (ret
== (struct generic_link_hash_entry
*) NULL
)
572 bfd_set_error (bfd_error_no_memory
);
576 /* Call the allocation method of the superclass. */
577 ret
= ((struct generic_link_hash_entry
*)
578 _bfd_link_hash_newfunc ((struct bfd_hash_entry
*) ret
,
583 /* Set local fields. */
584 ret
->written
= false;
588 return (struct bfd_hash_entry
*) ret
;
591 /* Create an generic link hash table. */
593 struct bfd_link_hash_table
*
594 _bfd_generic_link_hash_table_create (abfd
)
597 struct generic_link_hash_table
*ret
;
599 ret
= ((struct generic_link_hash_table
*)
600 malloc (sizeof (struct generic_link_hash_table
)));
603 bfd_set_error (bfd_error_no_memory
);
604 return (struct bfd_link_hash_table
*) NULL
;
606 if (! _bfd_link_hash_table_init (&ret
->root
, abfd
,
607 generic_link_hash_newfunc
))
610 return (struct bfd_link_hash_table
*) NULL
;
615 /* Grab the symbols for an object file when doing a generic link. We
616 store the symbols in the outsymbols field. We need to keep them
617 around for the entire link to ensure that we only read them once.
618 If we read them multiple times, we might wind up with relocs and
619 the hash table pointing to different instances of the symbol
623 generic_link_read_symbols (abfd
)
626 if (abfd
->outsymbols
== (asymbol
**) NULL
)
631 symsize
= bfd_get_symtab_upper_bound (abfd
);
634 abfd
->outsymbols
= (asymbol
**) bfd_alloc (abfd
, symsize
);
635 if (abfd
->outsymbols
== NULL
&& symsize
!= 0)
637 bfd_set_error (bfd_error_no_memory
);
640 symcount
= bfd_canonicalize_symtab (abfd
, abfd
->outsymbols
);
643 abfd
->symcount
= symcount
;
649 /* Generic function to add symbols to from an object file to the
650 global hash table. This version does not automatically collect
651 constructors by name. */
654 _bfd_generic_link_add_symbols (abfd
, info
)
656 struct bfd_link_info
*info
;
658 return generic_link_add_symbols (abfd
, info
, false);
661 /* Generic function to add symbols from an object file to the global
662 hash table. This version automatically collects constructors by
663 name, as the collect2 program does. It should be used for any
664 target which does not provide some other mechanism for setting up
665 constructors and destructors; these are approximately those targets
666 for which gcc uses collect2 and do not support stabs. */
669 _bfd_generic_link_add_symbols_collect (abfd
, info
)
671 struct bfd_link_info
*info
;
673 return generic_link_add_symbols (abfd
, info
, true);
676 /* Add symbols from an object file to the global hash table. */
679 generic_link_add_symbols (abfd
, info
, collect
)
681 struct bfd_link_info
*info
;
686 switch (bfd_get_format (abfd
))
689 ret
= generic_link_add_object_symbols (abfd
, info
, collect
);
692 ret
= (_bfd_generic_link_add_archive_symbols
695 ? generic_link_check_archive_element_collect
696 : generic_link_check_archive_element_no_collect
)));
699 bfd_set_error (bfd_error_wrong_format
);
706 /* Add symbols from an object file to the global hash table. */
709 generic_link_add_object_symbols (abfd
, info
, collect
)
711 struct bfd_link_info
*info
;
714 if (! generic_link_read_symbols (abfd
))
716 return generic_link_add_symbol_list (abfd
, info
,
717 _bfd_generic_link_get_symcount (abfd
),
718 _bfd_generic_link_get_symbols (abfd
),
722 /* We build a hash table of all symbols defined in an archive. */
724 /* An archive symbol may be defined by multiple archive elements.
725 This linked list is used to hold the elements. */
729 struct archive_list
*next
;
733 /* An entry in an archive hash table. */
735 struct archive_hash_entry
737 struct bfd_hash_entry root
;
738 /* Where the symbol is defined. */
739 struct archive_list
*defs
;
742 /* An archive hash table itself. */
744 struct archive_hash_table
746 struct bfd_hash_table table
;
749 static struct bfd_hash_entry
*archive_hash_newfunc
750 PARAMS ((struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *));
751 static boolean archive_hash_table_init
752 PARAMS ((struct archive_hash_table
*,
753 struct bfd_hash_entry
*(*) (struct bfd_hash_entry
*,
754 struct bfd_hash_table
*,
757 /* Create a new entry for an archive hash table. */
759 static struct bfd_hash_entry
*
760 archive_hash_newfunc (entry
, table
, string
)
761 struct bfd_hash_entry
*entry
;
762 struct bfd_hash_table
*table
;
765 struct archive_hash_entry
*ret
= (struct archive_hash_entry
*) entry
;
767 /* Allocate the structure if it has not already been allocated by a
769 if (ret
== (struct archive_hash_entry
*) NULL
)
770 ret
= ((struct archive_hash_entry
*)
771 bfd_hash_allocate (table
, sizeof (struct archive_hash_entry
)));
772 if (ret
== (struct archive_hash_entry
*) NULL
)
774 bfd_set_error (bfd_error_no_memory
);
778 /* Call the allocation method of the superclass. */
779 ret
= ((struct archive_hash_entry
*)
780 bfd_hash_newfunc ((struct bfd_hash_entry
*) ret
, table
, string
));
784 /* Initialize the local fields. */
785 ret
->defs
= (struct archive_list
*) NULL
;
788 return (struct bfd_hash_entry
*) ret
;
791 /* Initialize an archive hash table. */
794 archive_hash_table_init (table
, newfunc
)
795 struct archive_hash_table
*table
;
796 struct bfd_hash_entry
*(*newfunc
) PARAMS ((struct bfd_hash_entry
*,
797 struct bfd_hash_table
*,
800 return bfd_hash_table_init (&table
->table
, newfunc
);
803 /* Look up an entry in an archive hash table. */
805 #define archive_hash_lookup(t, string, create, copy) \
806 ((struct archive_hash_entry *) \
807 bfd_hash_lookup (&(t)->table, (string), (create), (copy)))
809 /* Allocate space in an archive hash table. */
811 #define archive_hash_allocate(t, size) bfd_hash_allocate (&(t)->table, (size))
813 /* Free an archive hash table. */
815 #define archive_hash_table_free(t) bfd_hash_table_free (&(t)->table)
817 /* Generic function to add symbols from an archive file to the global
818 hash file. This function presumes that the archive symbol table
819 has already been read in (this is normally done by the
820 bfd_check_format entry point). It looks through the undefined and
821 common symbols and searches the archive symbol table for them. If
822 it finds an entry, it includes the associated object file in the
825 The old linker looked through the archive symbol table for
826 undefined symbols. We do it the other way around, looking through
827 undefined symbols for symbols defined in the archive. The
828 advantage of the newer scheme is that we only have to look through
829 the list of undefined symbols once, whereas the old method had to
830 re-search the symbol table each time a new object file was added.
832 The CHECKFN argument is used to see if an object file should be
833 included. CHECKFN should set *PNEEDED to true if the object file
834 should be included, and must also call the bfd_link_info
835 add_archive_element callback function and handle adding the symbols
836 to the global hash table. CHECKFN should only return false if some
837 sort of error occurs.
839 For some formats, such as a.out, it is possible to look through an
840 object file but not actually include it in the link. The
841 archive_pass field in a BFD is used to avoid checking the symbols
842 of an object files too many times. When an object is included in
843 the link, archive_pass is set to -1. If an object is scanned but
844 not included, archive_pass is set to the pass number. The pass
845 number is incremented each time a new object file is included. The
846 pass number is used because when a new object file is included it
847 may create new undefined symbols which cause a previously examined
848 object file to be included. */
851 _bfd_generic_link_add_archive_symbols (abfd
, info
, checkfn
)
853 struct bfd_link_info
*info
;
854 boolean (*checkfn
) PARAMS ((bfd
*, struct bfd_link_info
*,
859 register carsym
*arsym
;
861 struct archive_hash_table arsym_hash
;
863 struct bfd_link_hash_entry
**pundef
;
865 if (! bfd_has_map (abfd
))
867 /* An empty archive is a special case. */
868 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
870 bfd_set_error (bfd_error_no_symbols
);
874 arsyms
= bfd_ardata (abfd
)->symdefs
;
875 arsym_end
= arsyms
+ bfd_ardata (abfd
)->symdef_count
;
877 /* In order to quickly determine whether an symbol is defined in
878 this archive, we build a hash table of the symbols. */
879 if (! archive_hash_table_init (&arsym_hash
, archive_hash_newfunc
))
881 for (arsym
= arsyms
, indx
= 0; arsym
< arsym_end
; arsym
++, indx
++)
883 struct archive_hash_entry
*arh
;
884 struct archive_list
*l
, **pp
;
886 arh
= archive_hash_lookup (&arsym_hash
, arsym
->name
, true, false);
887 if (arh
== (struct archive_hash_entry
*) NULL
)
889 l
= ((struct archive_list
*)
890 archive_hash_allocate (&arsym_hash
, sizeof (struct archive_list
)));
894 for (pp
= &arh
->defs
;
895 *pp
!= (struct archive_list
*) NULL
;
902 /* The archive_pass field in the archive itself is used to
903 initialize PASS, sine we may search the same archive multiple
905 pass
= abfd
->archive_pass
+ 1;
907 /* New undefined symbols are added to the end of the list, so we
908 only need to look through it once. */
909 pundef
= &info
->hash
->undefs
;
910 while (*pundef
!= (struct bfd_link_hash_entry
*) NULL
)
912 struct bfd_link_hash_entry
*h
;
913 struct archive_hash_entry
*arh
;
914 struct archive_list
*l
;
918 /* When a symbol is defined, it is not necessarily removed from
920 if (h
->type
!= bfd_link_hash_undefined
921 && h
->type
!= bfd_link_hash_common
)
923 /* Remove this entry from the list, for general cleanliness
924 and because we are going to look through the list again
925 if we search any more libraries. We can't remove the
926 entry if it is the tail, because that would lose any
927 entries we add to the list later on (it would also cause
928 us to lose track of whether the symbol has been
930 if (*pundef
!= info
->hash
->undefs_tail
)
931 *pundef
= (*pundef
)->next
;
933 pundef
= &(*pundef
)->next
;
937 /* Look for this symbol in the archive symbol map. */
938 arh
= archive_hash_lookup (&arsym_hash
, h
->root
.string
, false, false);
939 if (arh
== (struct archive_hash_entry
*) NULL
)
941 pundef
= &(*pundef
)->next
;
945 /* Look at all the objects which define this symbol. */
946 for (l
= arh
->defs
; l
!= (struct archive_list
*) NULL
; l
= l
->next
)
951 /* If the symbol has gotten defined along the way, quit. */
952 if (h
->type
!= bfd_link_hash_undefined
953 && h
->type
!= bfd_link_hash_common
)
956 element
= bfd_get_elt_at_index (abfd
, l
->indx
);
957 if (element
== (bfd
*) NULL
)
960 /* If we've already included this element, or if we've
961 already checked it on this pass, continue. */
962 if (element
->archive_pass
== -1
963 || element
->archive_pass
== pass
)
966 /* If we can't figure this element out, just ignore it. */
967 if (! bfd_check_format (element
, bfd_object
))
969 element
->archive_pass
= -1;
973 /* CHECKFN will see if this element should be included, and
974 go ahead and include it if appropriate. */
975 if (! (*checkfn
) (element
, info
, &needed
))
979 element
->archive_pass
= pass
;
982 element
->archive_pass
= -1;
984 /* Increment the pass count to show that we may need to
985 recheck object files which were already checked. */
990 pundef
= &(*pundef
)->next
;
993 archive_hash_table_free (&arsym_hash
);
995 /* Save PASS in case we are called again. */
996 abfd
->archive_pass
= pass
;
1001 archive_hash_table_free (&arsym_hash
);
1005 /* See if we should include an archive element. This version is used
1006 when we do not want to automatically collect constructors based on
1007 the symbol name, presumably because we have some other mechanism
1008 for finding them. */
1011 generic_link_check_archive_element_no_collect (abfd
, info
, pneeded
)
1013 struct bfd_link_info
*info
;
1016 return generic_link_check_archive_element (abfd
, info
, pneeded
, false);
1019 /* See if we should include an archive element. This version is used
1020 when we want to automatically collect constructors based on the
1021 symbol name, as collect2 does. */
1024 generic_link_check_archive_element_collect (abfd
, info
, pneeded
)
1026 struct bfd_link_info
*info
;
1029 return generic_link_check_archive_element (abfd
, info
, pneeded
, true);
1032 /* See if we should include an archive element. Optionally collect
1036 generic_link_check_archive_element (abfd
, info
, pneeded
, collect
)
1038 struct bfd_link_info
*info
;
1042 asymbol
**pp
, **ppend
;
1046 if (! generic_link_read_symbols (abfd
))
1049 pp
= _bfd_generic_link_get_symbols (abfd
);
1050 ppend
= pp
+ _bfd_generic_link_get_symcount (abfd
);
1051 for (; pp
< ppend
; pp
++)
1054 struct bfd_link_hash_entry
*h
;
1058 /* We are only interested in globally visible symbols. */
1059 if (! bfd_is_com_section (p
->section
)
1060 && (p
->flags
& (BSF_GLOBAL
| BSF_INDIRECT
| BSF_WEAK
)) == 0)
1063 /* We are only interested if we know something about this
1064 symbol, and it is undefined or common. An undefined weak
1065 symbol (type bfd_link_hash_undefweak) is not considered to be
1066 a reference when pulling files out of an archive. See the
1067 SVR4 ABI, p. 4-27. */
1068 h
= bfd_link_hash_lookup (info
->hash
, bfd_asymbol_name (p
), false,
1070 if (h
== (struct bfd_link_hash_entry
*) NULL
1071 || (h
->type
!= bfd_link_hash_undefined
1072 && h
->type
!= bfd_link_hash_common
))
1075 /* P is a symbol we are looking for. */
1077 if (! bfd_is_com_section (p
->section
))
1079 bfd_size_type symcount
;
1082 /* This object file defines this symbol, so pull it in. */
1083 if (! (*info
->callbacks
->add_archive_element
) (info
, abfd
,
1084 bfd_asymbol_name (p
)))
1086 symcount
= _bfd_generic_link_get_symcount (abfd
);
1087 symbols
= _bfd_generic_link_get_symbols (abfd
);
1088 if (! generic_link_add_symbol_list (abfd
, info
, symcount
,
1095 /* P is a common symbol. */
1097 if (h
->type
== bfd_link_hash_undefined
)
1103 symbfd
= h
->u
.undef
.abfd
;
1104 if (symbfd
== (bfd
*) NULL
)
1106 /* This symbol was created as undefined from outside
1107 BFD. We assume that we should link in the object
1108 file. This is for the -u option in the linker. */
1109 if (! (*info
->callbacks
->add_archive_element
)
1110 (info
, abfd
, bfd_asymbol_name (p
)))
1116 /* Turn the symbol into a common symbol but do not link in
1117 the object file. This is how a.out works. Object
1118 formats that require different semantics must implement
1119 this function differently. This symbol is already on the
1120 undefs list. We add the section to a common section
1121 attached to symbfd to ensure that it is in a BFD which
1122 will be linked in. */
1123 h
->type
= bfd_link_hash_common
;
1125 size
= bfd_asymbol_value (p
);
1127 if (h
->u
.c
.size
!= size
)
1129 /* The size did not fit in the bitfield. */
1130 bfd_set_error (bfd_error_bad_value
);
1134 power
= bfd_log2 (size
);
1137 h
->u
.c
.alignment_power
= power
;
1139 if (p
->section
== bfd_com_section_ptr
)
1140 h
->u
.c
.section
= bfd_make_section_old_way (symbfd
, "COMMON");
1142 h
->u
.c
.section
= bfd_make_section_old_way (symbfd
,
1144 h
->u
.c
.section
->flags
= SEC_ALLOC
;
1148 /* Adjust the size of the common symbol if necessary. This
1149 is how a.out works. Object formats that require
1150 different semantics must implement this function
1152 if (bfd_asymbol_value (p
) > h
->u
.c
.size
)
1153 h
->u
.c
.size
= bfd_asymbol_value (p
);
1157 /* This archive element is not needed. */
1161 /* Add the symbols from an object file to the global hash table. ABFD
1162 is the object file. INFO is the linker information. SYMBOL_COUNT
1163 is the number of symbols. SYMBOLS is the list of symbols. COLLECT
1164 is true if constructors should be automatically collected by name
1165 as is done by collect2. */
1168 generic_link_add_symbol_list (abfd
, info
, symbol_count
, symbols
, collect
)
1170 struct bfd_link_info
*info
;
1171 bfd_size_type symbol_count
;
1175 asymbol
**pp
, **ppend
;
1178 ppend
= symbols
+ symbol_count
;
1179 for (; pp
< ppend
; pp
++)
1185 if ((p
->flags
& (BSF_INDIRECT
1190 || bfd_is_und_section (bfd_get_section (p
))
1191 || bfd_is_com_section (bfd_get_section (p
))
1192 || bfd_is_ind_section (bfd_get_section (p
)))
1196 struct generic_link_hash_entry
*h
;
1198 name
= bfd_asymbol_name (p
);
1199 if ((p
->flags
& BSF_INDIRECT
) != 0
1200 || bfd_is_ind_section (p
->section
))
1201 string
= bfd_asymbol_name ((asymbol
*) p
->value
);
1202 else if ((p
->flags
& BSF_WARNING
) != 0)
1204 /* The name of P is actually the warning string, and the
1205 value is actually a pointer to the symbol to warn
1208 name
= bfd_asymbol_name ((asymbol
*) p
->value
);
1214 if (! (_bfd_generic_link_add_one_symbol
1215 (info
, abfd
, name
, p
->flags
, bfd_get_section (p
),
1216 p
->value
, string
, false, collect
,
1217 (struct bfd_link_hash_entry
**) &h
)))
1220 /* Save the BFD symbol so that we don't lose any backend
1221 specific information that may be attached to it. We only
1222 want this one if it gives more information than the
1223 existing one; we don't want to replace a defined symbol
1224 with an undefined one. This routine may be called with a
1225 hash table other than the generic hash table, so we only
1226 do this if we are certain that the hash table is a
1228 if (info
->hash
->creator
== abfd
->xvec
)
1230 if (h
->sym
== (asymbol
*) NULL
1231 || (! bfd_is_und_section (bfd_get_section (p
))
1232 && (! bfd_is_com_section (bfd_get_section (p
))
1233 || bfd_is_und_section (bfd_get_section (h
->sym
)))))
1236 /* BSF_OLD_COMMON is a hack to support COFF reloc
1237 reading, and it should go away when the COFF
1238 linker is switched to the new version. */
1239 if (bfd_is_com_section (bfd_get_section (p
)))
1240 p
->flags
|= BSF_OLD_COMMON
;
1243 /* Store a back pointer from the symbol to the hash
1244 table entry for the benefit of relaxation code until
1245 it gets rewritten to not use asymbol structures.
1246 Setting this is also used to check whether these
1247 symbols were set up by the generic linker. */
1248 p
->udata
.p
= (PTR
) h
;
1256 /* We use a state table to deal with adding symbols from an object
1257 file. The first index into the state table describes the symbol
1258 from the object file. The second index into the state table is the
1259 type of the symbol in the hash table. */
1261 /* The symbol from the object file is turned into one of these row
1266 UNDEF_ROW
, /* Undefined. */
1267 UNDEFW_ROW
, /* Weak undefined. */
1268 DEF_ROW
, /* Defined. */
1269 DEFW_ROW
, /* Weak defined. */
1270 COMMON_ROW
, /* Common. */
1271 INDR_ROW
, /* Indirect. */
1272 WARN_ROW
, /* Warning. */
1273 SET_ROW
/* Member of set. */
1276 /* apparently needed for Hitachi 3050R(HI-UX/WE2)? */
1279 /* The actions to take in the state table. */
1284 UND
, /* Mark symbol undefined. */
1285 WEAK
, /* Mark symbol weak undefined. */
1286 DEF
, /* Mark symbol defined. */
1287 DEFW
, /* Mark symbol weak defined. */
1288 COM
, /* Mark symbol common. */
1289 REF
, /* Mark defined symbol referenced. */
1290 CREF
, /* Possibly warn about common reference to defined symbol. */
1291 CDEF
, /* Define existing common symbol. */
1292 NOACT
, /* No action. */
1293 BIG
, /* Mark symbol common using largest size. */
1294 MDEF
, /* Multiple definition error. */
1295 MIND
, /* Multiple indirect symbols. */
1296 IND
, /* Make indirect symbol. */
1297 CIND
, /* Make indirect symbol from existing common symbol. */
1298 SET
, /* Add value to set. */
1299 MWARN
, /* Make warning symbol. */
1300 WARN
, /* Issue warning. */
1301 CWARN
, /* Warn if referenced, else MWARN. */
1302 CYCLE
, /* Repeat with symbol pointed to. */
1303 REFC
, /* Mark indirect symbol referenced and then CYCLE. */
1304 WARNC
/* Issue warning and then CYCLE. */
1307 /* The state table itself. The first index is a link_row and the
1308 second index is a bfd_link_hash_type. */
1310 static const enum link_action link_action
[8][8] =
1312 /* current\prev new undef undefw def defw com indr warn */
1313 /* UNDEF_ROW */ {UND
, NOACT
, NOACT
, REF
, REF
, NOACT
, REFC
, WARNC
},
1314 /* UNDEFW_ROW */ {WEAK
, WEAK
, NOACT
, REF
, REF
, NOACT
, REFC
, WARNC
},
1315 /* DEF_ROW */ {DEF
, DEF
, DEF
, MDEF
, DEF
, CDEF
, MDEF
, CYCLE
},
1316 /* DEFW_ROW */ {DEFW
, DEFW
, DEFW
, NOACT
, NOACT
, NOACT
, NOACT
, CYCLE
},
1317 /* COMMON_ROW */ {COM
, COM
, COM
, CREF
, CREF
, BIG
, CREF
, WARNC
},
1318 /* INDR_ROW */ {IND
, IND
, IND
, MDEF
, IND
, CIND
, MIND
, CYCLE
},
1319 /* WARN_ROW */ {MWARN
, WARN
, WARN
, CWARN
, CWARN
, WARN
, CWARN
, CYCLE
},
1320 /* SET_ROW */ {SET
, SET
, SET
, SET
, SET
, SET
, CYCLE
, CYCLE
}
1323 /* Most of the entries in the LINK_ACTION table are straightforward,
1324 but a few are somewhat subtle.
1326 A reference to an indirect symbol (UNDEF_ROW/indr or
1327 UNDEFW_ROW/indr) is counted as a reference both to the indirect
1328 symbol and to the symbol the indirect symbol points to.
1330 A reference to a warning symbol (UNDEF_ROW/warn or UNDEFW_ROW/warn)
1331 causes the warning to be issued.
1333 A common definition of an indirect symbol (COMMON_ROW/indr) is
1334 treated as a multiple definition error. Likewise for an indirect
1335 definition of a common symbol (INDR_ROW/com).
1337 An indirect definition of a warning (INDR_ROW/warn) does not cause
1338 the warning to be issued.
1340 If a warning is created for an indirect symbol (WARN_ROW/indr) no
1341 warning is created for the symbol the indirect symbol points to.
1343 Adding an entry to a set does not count as a reference to a set,
1344 and no warning is issued (SET_ROW/warn). */
1346 /* Add a symbol to the global hash table.
1347 ABFD is the BFD the symbol comes from.
1348 NAME is the name of the symbol.
1349 FLAGS is the BSF_* bits associated with the symbol.
1350 SECTION is the section in which the symbol is defined; this may be
1351 bfd_und_section_ptr or bfd_com_section_ptr.
1352 VALUE is the value of the symbol, relative to the section.
1353 STRING is used for either an indirect symbol, in which case it is
1354 the name of the symbol to indirect to, or a warning symbol, in
1355 which case it is the warning string.
1356 COPY is true if NAME or STRING must be copied into locally
1357 allocated memory if they need to be saved.
1358 COLLECT is true if we should automatically collect gcc constructor
1359 or destructor names as collect2 does.
1360 HASHP, if not NULL, is a place to store the created hash table
1361 entry; if *HASHP is not NULL, the caller has already looked up
1362 the hash table entry, and stored it in *HASHP. */
1365 _bfd_generic_link_add_one_symbol (info
, abfd
, name
, flags
, section
, value
,
1366 string
, copy
, collect
, hashp
)
1367 struct bfd_link_info
*info
;
1376 struct bfd_link_hash_entry
**hashp
;
1379 struct bfd_link_hash_entry
*h
;
1382 if (bfd_is_ind_section (section
)
1383 || (flags
& BSF_INDIRECT
) != 0)
1385 else if ((flags
& BSF_WARNING
) != 0)
1387 else if ((flags
& BSF_CONSTRUCTOR
) != 0)
1389 else if (bfd_is_und_section (section
))
1391 if ((flags
& BSF_WEAK
) != 0)
1396 else if ((flags
& BSF_WEAK
) != 0)
1398 else if (bfd_is_com_section (section
))
1403 if (hashp
!= NULL
&& *hashp
!= NULL
)
1406 BFD_ASSERT (strcmp (h
->root
.string
, name
) == 0);
1410 h
= bfd_link_hash_lookup (info
->hash
, name
, true, copy
, false);
1419 if (info
->notice_hash
!= (struct bfd_hash_table
*) NULL
1420 && (bfd_hash_lookup (info
->notice_hash
, name
, false, false)
1421 != (struct bfd_hash_entry
*) NULL
))
1423 if (! (*info
->callbacks
->notice
) (info
, name
, abfd
, section
, value
))
1427 if (hashp
!= (struct bfd_link_hash_entry
**) NULL
)
1432 enum link_action action
;
1435 action
= link_action
[(int) row
][(int) h
->type
];
1446 /* Make a new undefined symbol. */
1447 h
->type
= bfd_link_hash_undefined
;
1448 h
->u
.undef
.abfd
= abfd
;
1449 bfd_link_add_undef (info
->hash
, h
);
1453 /* Make a new weak undefined symbol. */
1454 h
->type
= bfd_link_hash_undefweak
;
1455 h
->u
.undef
.abfd
= abfd
;
1459 /* We have found a definition for a symbol which was
1460 previously common. */
1461 BFD_ASSERT (h
->type
== bfd_link_hash_common
);
1462 if (! ((*info
->callbacks
->multiple_common
)
1464 h
->u
.c
.section
->owner
, bfd_link_hash_common
, h
->u
.c
.size
,
1465 abfd
, bfd_link_hash_defined
, (bfd_vma
) 0)))
1471 enum bfd_link_order_type oldtype
;
1473 /* Define a symbol. */
1476 h
->type
= bfd_link_hash_defweak
;
1478 h
->type
= bfd_link_hash_defined
;
1479 h
->u
.def
.section
= section
;
1480 h
->u
.def
.value
= value
;
1482 /* If we have been asked to, we act like collect2 and
1483 identify all functions that might be global
1484 constructors and destructors and pass them up in a
1485 callback. We only do this for certain object file
1486 types, since many object file types can handle this
1488 if (collect
&& name
[0] == '_')
1492 /* A constructor or destructor name starts like this:
1493 _+GLOBAL_[_.$][ID][_.$] where the first [_.$] and
1494 the second are the same character (we accept any
1495 character there, in case a new object file format
1496 comes along with even worse naming restrictions). */
1498 #define CONS_PREFIX "GLOBAL_"
1499 #define CONS_PREFIX_LEN (sizeof CONS_PREFIX - 1)
1505 && strncmp (s
, CONS_PREFIX
, CONS_PREFIX_LEN
- 1) == 0)
1509 c
= s
[CONS_PREFIX_LEN
+ 1];
1510 if ((c
== 'I' || c
== 'D')
1511 && s
[CONS_PREFIX_LEN
] == s
[CONS_PREFIX_LEN
+ 2])
1513 /* If this is a definition of a symbol which
1514 was previously weakly defined, we are in
1515 trouble. We have already added a
1516 constructor entry for the weak defined
1517 symbol, and now we are trying to add one
1518 for the new symbol. Fortunately, this case
1519 should never arise in practice. */
1520 if (oldtype
== bfd_link_hash_defweak
)
1523 if (! ((*info
->callbacks
->constructor
)
1525 c
== 'I' ? true : false,
1526 name
, abfd
, section
, value
)))
1536 /* We have found a common definition for a symbol. */
1537 if (h
->type
== bfd_link_hash_new
)
1538 bfd_link_add_undef (info
->hash
, h
);
1539 h
->type
= bfd_link_hash_common
;
1540 h
->u
.c
.size
= value
;
1541 if (h
->u
.c
.size
!= value
)
1543 /* The size did not fit in the bitfield. */
1544 bfd_set_error (bfd_error_bad_value
);
1548 /* Select a default alignment based on the size. This may
1549 be overridden by the caller. */
1553 power
= bfd_log2 (value
);
1556 h
->u
.c
.alignment_power
= power
;
1559 /* The section of a common symbol is only used if the common
1560 symbol is actually allocated. It basically provides a
1561 hook for the linker script to decide which output section
1562 the common symbols should be put in. In most cases, the
1563 section of a common symbol will be bfd_com_section_ptr,
1564 the code here will choose a common symbol section named
1565 "COMMON", and the linker script will contain *(COMMON) in
1566 the appropriate place. A few targets use separate common
1567 sections for small symbols, and they require special
1569 if (section
== bfd_com_section_ptr
)
1571 h
->u
.c
.section
= bfd_make_section_old_way (abfd
, "COMMON");
1572 h
->u
.c
.section
->flags
= SEC_ALLOC
;
1574 else if (section
->owner
!= abfd
)
1576 h
->u
.c
.section
= bfd_make_section_old_way (abfd
, section
->name
);
1577 h
->u
.c
.section
->flags
= SEC_ALLOC
;
1580 h
->u
.c
.section
= section
;
1584 /* A reference to a defined symbol. */
1585 if (h
->next
== NULL
&& info
->hash
->undefs_tail
!= h
)
1590 /* We have found a common definition for a symbol which
1591 already had a common definition. Use the maximum of the
1593 BFD_ASSERT (h
->type
== bfd_link_hash_common
);
1594 if (! ((*info
->callbacks
->multiple_common
)
1596 h
->u
.c
.section
->owner
, bfd_link_hash_common
, h
->u
.c
.size
,
1597 abfd
, bfd_link_hash_common
, value
)))
1599 if (value
> h
->u
.c
.size
)
1603 h
->u
.c
.size
= value
;
1605 /* Select a default alignment based on the size. This may
1606 be overridden by the caller. */
1607 power
= bfd_log2 (value
);
1610 h
->u
.c
.alignment_power
= power
;
1618 /* We have found a common definition for a symbol which
1619 was already defined. FIXME: It would nice if we could
1620 report the BFD which defined an indirect symbol, but we
1621 don't have anywhere to store the information. */
1622 if (h
->type
== bfd_link_hash_defined
1623 || h
->type
== bfd_link_hash_defweak
)
1624 obfd
= h
->u
.def
.section
->owner
;
1627 if (! ((*info
->callbacks
->multiple_common
)
1628 (info
, name
, obfd
, h
->type
, (bfd_vma
) 0,
1629 abfd
, bfd_link_hash_common
, value
)))
1635 /* Multiple indirect symbols. This is OK if they both point
1636 to the same symbol. */
1637 if (strcmp (h
->u
.i
.link
->root
.string
, string
) == 0)
1641 /* Handle a multiple definition. */
1648 case bfd_link_hash_defined
:
1649 msec
= h
->u
.def
.section
;
1650 mval
= h
->u
.def
.value
;
1652 case bfd_link_hash_indirect
:
1653 msec
= bfd_ind_section_ptr
;
1660 /* Ignore a redefinition of an absolute symbol to the same
1661 value; it's harmless. */
1662 if (h
->type
== bfd_link_hash_defined
1663 && bfd_is_abs_section (msec
)
1664 && bfd_is_abs_section (section
)
1668 if (! ((*info
->callbacks
->multiple_definition
)
1669 (info
, name
, msec
->owner
, msec
, mval
, abfd
, section
,
1676 /* Create an indirect symbol from an existing common symbol. */
1677 BFD_ASSERT (h
->type
== bfd_link_hash_common
);
1678 if (! ((*info
->callbacks
->multiple_common
)
1680 h
->u
.c
.section
->owner
, bfd_link_hash_common
, h
->u
.c
.size
,
1681 abfd
, bfd_link_hash_indirect
, (bfd_vma
) 0)))
1685 /* Create an indirect symbol. */
1687 struct bfd_link_hash_entry
*inh
;
1689 /* STRING is the name of the symbol we want to indirect
1691 inh
= bfd_link_hash_lookup (info
->hash
, string
, true, copy
,
1693 if (inh
== (struct bfd_link_hash_entry
*) NULL
)
1695 if (inh
->type
== bfd_link_hash_new
)
1697 inh
->type
= bfd_link_hash_undefined
;
1698 inh
->u
.undef
.abfd
= abfd
;
1699 bfd_link_add_undef (info
->hash
, inh
);
1702 /* If the indirect symbol has been referenced, we need to
1703 push the reference down to the symbol we are
1705 if (h
->type
!= bfd_link_hash_new
)
1711 h
->type
= bfd_link_hash_indirect
;
1717 /* Add an entry to a set. */
1718 if (! (*info
->callbacks
->add_to_set
) (info
, h
, BFD_RELOC_CTOR
,
1719 abfd
, section
, value
))
1724 /* Issue a warning and cycle. */
1725 if (h
->u
.i
.warning
!= NULL
)
1727 if (! (*info
->callbacks
->warning
) (info
, h
->u
.i
.warning
))
1729 /* Only issue a warning once. */
1730 h
->u
.i
.warning
= NULL
;
1734 /* Try again with the referenced symbol. */
1740 /* A reference to an indirect symbol. */
1741 if (h
->next
== NULL
&& info
->hash
->undefs_tail
!= h
)
1748 /* Issue a warning. */
1749 if (! (*info
->callbacks
->warning
) (info
, string
))
1754 /* Warn if this symbol has been referenced already,
1755 otherwise add a warning. A symbol has been referenced if
1756 the next field is not NULL, or it is the tail of the
1757 undefined symbol list. The REF case above helps to
1759 if (h
->next
!= NULL
|| info
->hash
->undefs_tail
== h
)
1761 if (! (*info
->callbacks
->warning
) (info
, string
))
1767 /* Make a warning symbol. */
1769 struct bfd_link_hash_entry
*sub
;
1771 /* STRING is the warning to give. */
1772 sub
= ((struct bfd_link_hash_entry
*)
1773 bfd_hash_allocate (&info
->hash
->table
,
1774 sizeof (struct bfd_link_hash_entry
)));
1777 bfd_set_error (bfd_error_no_memory
);
1781 h
->type
= bfd_link_hash_warning
;
1784 h
->u
.i
.warning
= string
;
1789 w
= bfd_hash_allocate (&info
->hash
->table
,
1790 strlen (string
) + 1);
1803 /* Generic final link routine. */
1806 _bfd_generic_final_link (abfd
, info
)
1808 struct bfd_link_info
*info
;
1812 struct bfd_link_order
*p
;
1814 struct generic_write_global_symbol_info wginfo
;
1816 abfd
->outsymbols
= (asymbol
**) NULL
;
1820 /* Build the output symbol table. */
1821 for (sub
= info
->input_bfds
; sub
!= (bfd
*) NULL
; sub
= sub
->link_next
)
1822 if (! _bfd_generic_link_output_symbols (abfd
, sub
, info
, &outsymalloc
))
1825 /* Accumulate the global symbols. */
1827 wginfo
.output_bfd
= abfd
;
1828 wginfo
.psymalloc
= &outsymalloc
;
1829 _bfd_generic_link_hash_traverse (_bfd_generic_hash_table (info
),
1830 _bfd_generic_link_write_global_symbol
,
1833 if (info
->relocateable
)
1835 /* Allocate space for the output relocs for each section. */
1836 for (o
= abfd
->sections
;
1837 o
!= (asection
*) NULL
;
1841 for (p
= o
->link_order_head
;
1842 p
!= (struct bfd_link_order
*) NULL
;
1845 if (p
->type
== bfd_section_reloc_link_order
1846 || p
->type
== bfd_symbol_reloc_link_order
)
1848 else if (p
->type
== bfd_indirect_link_order
)
1850 asection
*input_section
;
1857 input_section
= p
->u
.indirect
.section
;
1858 input_bfd
= input_section
->owner
;
1859 relsize
= bfd_get_reloc_upper_bound (input_bfd
,
1863 relocs
= (arelent
**) malloc ((size_t) relsize
);
1864 if (!relocs
&& relsize
!= 0)
1866 bfd_set_error (bfd_error_no_memory
);
1869 symbols
= _bfd_generic_link_get_symbols (input_bfd
);
1870 reloc_count
= bfd_canonicalize_reloc (input_bfd
,
1874 if (reloc_count
< 0)
1876 BFD_ASSERT (reloc_count
== input_section
->reloc_count
);
1877 o
->reloc_count
+= reloc_count
;
1881 if (o
->reloc_count
> 0)
1883 o
->orelocation
= ((arelent
**)
1886 * sizeof (arelent
*))));
1887 if (!o
->orelocation
)
1889 bfd_set_error (bfd_error_no_memory
);
1892 o
->flags
|= SEC_RELOC
;
1893 /* Reset the count so that it can be used as an index
1894 when putting in the output relocs. */
1900 /* Handle all the link order information for the sections. */
1901 for (o
= abfd
->sections
;
1902 o
!= (asection
*) NULL
;
1905 for (p
= o
->link_order_head
;
1906 p
!= (struct bfd_link_order
*) NULL
;
1911 case bfd_section_reloc_link_order
:
1912 case bfd_symbol_reloc_link_order
:
1913 if (! _bfd_generic_reloc_link_order (abfd
, info
, o
, p
))
1916 case bfd_indirect_link_order
:
1917 if (! default_indirect_link_order (abfd
, info
, o
, p
, true))
1921 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
1931 /* Add an output symbol to the output BFD. */
1934 generic_add_output_symbol (output_bfd
, psymalloc
, sym
)
1939 if (output_bfd
->symcount
>= *psymalloc
)
1943 if (*psymalloc
== 0)
1947 if (output_bfd
->outsymbols
== (asymbol
**) NULL
)
1948 newsyms
= (asymbol
**) malloc (*psymalloc
* sizeof (asymbol
*));
1950 newsyms
= (asymbol
**) realloc (output_bfd
->outsymbols
,
1951 *psymalloc
* sizeof (asymbol
*));
1952 if (newsyms
== (asymbol
**) NULL
)
1954 bfd_set_error (bfd_error_no_memory
);
1957 output_bfd
->outsymbols
= newsyms
;
1960 output_bfd
->outsymbols
[output_bfd
->symcount
] = sym
;
1961 ++output_bfd
->symcount
;
1966 /* Handle the symbols for an input BFD. */
1969 _bfd_generic_link_output_symbols (output_bfd
, input_bfd
, info
, psymalloc
)
1972 struct bfd_link_info
*info
;
1978 if (! generic_link_read_symbols (input_bfd
))
1981 /* Create a filename symbol if we are supposed to. */
1982 if (info
->create_object_symbols_section
!= (asection
*) NULL
)
1986 for (sec
= input_bfd
->sections
;
1987 sec
!= (asection
*) NULL
;
1990 if (sec
->output_section
== info
->create_object_symbols_section
)
1994 newsym
= bfd_make_empty_symbol (input_bfd
);
1997 newsym
->name
= input_bfd
->filename
;
1999 newsym
->flags
= BSF_LOCAL
| BSF_FILE
;
2000 newsym
->section
= sec
;
2002 if (! generic_add_output_symbol (output_bfd
, psymalloc
,
2011 /* Adjust the values of the globally visible symbols, and write out
2013 sym_ptr
= _bfd_generic_link_get_symbols (input_bfd
);
2014 sym_end
= sym_ptr
+ _bfd_generic_link_get_symcount (input_bfd
);
2015 for (; sym_ptr
< sym_end
; sym_ptr
++)
2018 struct generic_link_hash_entry
*h
;
2021 h
= (struct generic_link_hash_entry
*) NULL
;
2023 if ((sym
->flags
& (BSF_INDIRECT
2028 || bfd_is_und_section (bfd_get_section (sym
))
2029 || bfd_is_com_section (bfd_get_section (sym
))
2030 || bfd_is_ind_section (bfd_get_section (sym
)))
2032 h
= _bfd_generic_link_hash_lookup (_bfd_generic_hash_table (info
),
2033 bfd_asymbol_name (sym
),
2034 false, false, true);
2035 if (h
!= (struct generic_link_hash_entry
*) NULL
)
2037 /* Force all references to this symbol to point to
2038 the same area in memory. It is possible that
2039 this routine will be called with a hash table
2040 other than a generic hash table, so we double
2042 if (info
->hash
->creator
== input_bfd
->xvec
)
2044 if (h
->sym
!= (asymbol
*) NULL
)
2045 *sym_ptr
= sym
= h
->sym
;
2048 switch (h
->root
.type
)
2051 case bfd_link_hash_new
:
2053 case bfd_link_hash_undefined
:
2055 case bfd_link_hash_undefweak
:
2056 sym
->flags
|= BSF_WEAK
;
2058 case bfd_link_hash_defined
:
2059 sym
->flags
|= BSF_GLOBAL
;
2060 sym
->value
= h
->root
.u
.def
.value
;
2061 sym
->section
= h
->root
.u
.def
.section
;
2063 case bfd_link_hash_defweak
:
2064 sym
->flags
|= BSF_WEAK
;
2065 sym
->value
= h
->root
.u
.def
.value
;
2066 sym
->section
= h
->root
.u
.def
.section
;
2068 case bfd_link_hash_common
:
2069 sym
->value
= h
->root
.u
.c
.size
;
2070 sym
->flags
|= BSF_GLOBAL
;
2071 if (! bfd_is_com_section (sym
->section
))
2073 BFD_ASSERT (bfd_is_und_section (sym
->section
));
2074 sym
->section
= bfd_com_section_ptr
;
2076 /* We do not set the section of the symbol to
2077 h->root.u.c.section. That value was saved so
2078 that we would know where to allocate the symbol
2079 if it was defined. In this case the type is
2080 still bfd_link_hash_common, so we did not define
2081 it, so we do not want to use that section. */
2087 /* This switch is straight from the old code in
2088 write_file_locals in ldsym.c. */
2089 if (info
->strip
== strip_some
2090 && (bfd_hash_lookup (info
->keep_hash
, bfd_asymbol_name (sym
),
2092 == (struct bfd_hash_entry
*) NULL
))
2094 else if ((sym
->flags
& (BSF_GLOBAL
| BSF_WEAK
)) != 0)
2096 /* If this symbol is marked as occurring now, rather
2097 than at the end, output it now. This is used for
2098 COFF C_EXT FCN symbols. FIXME: There must be a
2100 if (bfd_asymbol_bfd (sym
) == input_bfd
2101 && (sym
->flags
& BSF_NOT_AT_END
) != 0)
2106 else if (bfd_is_ind_section (sym
->section
))
2108 else if ((sym
->flags
& BSF_DEBUGGING
) != 0)
2110 if (info
->strip
== strip_none
)
2115 else if (bfd_is_und_section (sym
->section
)
2116 || bfd_is_com_section (sym
->section
))
2118 else if ((sym
->flags
& BSF_LOCAL
) != 0)
2120 if ((sym
->flags
& BSF_WARNING
) != 0)
2124 switch (info
->discard
)
2131 if (bfd_asymbol_name (sym
)[0] == info
->lprefix
[0]
2132 && (info
->lprefix_len
== 1
2133 || strncmp (bfd_asymbol_name (sym
), info
->lprefix
,
2134 info
->lprefix_len
) == 0))
2145 else if ((sym
->flags
& BSF_CONSTRUCTOR
))
2147 if (info
->strip
!= strip_all
)
2157 if (! generic_add_output_symbol (output_bfd
, psymalloc
, sym
))
2159 if (h
!= (struct generic_link_hash_entry
*) NULL
)
2167 /* Set the section and value of a generic BFD symbol based on a linker
2168 hash table entry. */
2171 set_symbol_from_hash (sym
, h
)
2173 struct bfd_link_hash_entry
*h
;
2178 case bfd_link_hash_new
:
2180 case bfd_link_hash_undefined
:
2181 sym
->section
= bfd_und_section_ptr
;
2184 case bfd_link_hash_undefweak
:
2185 sym
->section
= bfd_und_section_ptr
;
2187 sym
->flags
|= BSF_WEAK
;
2189 case bfd_link_hash_defined
:
2190 sym
->section
= h
->u
.def
.section
;
2191 sym
->value
= h
->u
.def
.value
;
2193 case bfd_link_hash_defweak
:
2194 sym
->flags
|= BSF_WEAK
;
2195 sym
->section
= h
->u
.def
.section
;
2196 sym
->value
= h
->u
.def
.value
;
2198 case bfd_link_hash_common
:
2199 sym
->value
= h
->u
.c
.size
;
2200 if (sym
->section
== NULL
)
2201 sym
->section
= bfd_com_section_ptr
;
2202 else if (! bfd_is_com_section (sym
->section
))
2204 BFD_ASSERT (bfd_is_und_section (sym
->section
));
2205 sym
->section
= bfd_com_section_ptr
;
2207 /* Do not set the section; see _bfd_generic_link_output_symbols. */
2209 case bfd_link_hash_indirect
:
2210 case bfd_link_hash_warning
:
2211 /* FIXME: What should we do here? */
2216 /* Write out a global symbol, if it hasn't already been written out.
2217 This is called for each symbol in the hash table. */
2220 _bfd_generic_link_write_global_symbol (h
, data
)
2221 struct generic_link_hash_entry
*h
;
2224 struct generic_write_global_symbol_info
*wginfo
=
2225 (struct generic_write_global_symbol_info
*) data
;
2233 if (wginfo
->info
->strip
== strip_all
2234 || (wginfo
->info
->strip
== strip_some
2235 && bfd_hash_lookup (wginfo
->info
->keep_hash
, h
->root
.root
.string
,
2236 false, false) == NULL
))
2239 if (h
->sym
!= (asymbol
*) NULL
)
2242 BFD_ASSERT (strcmp (bfd_asymbol_name (sym
), h
->root
.root
.string
) == 0);
2246 sym
= bfd_make_empty_symbol (wginfo
->output_bfd
);
2249 sym
->name
= h
->root
.root
.string
;
2253 set_symbol_from_hash (sym
, &h
->root
);
2255 sym
->flags
|= BSF_GLOBAL
;
2257 if (! generic_add_output_symbol (wginfo
->output_bfd
, wginfo
->psymalloc
,
2260 /* FIXME: No way to return failure. */
2267 /* Create a relocation. */
2270 _bfd_generic_reloc_link_order (abfd
, info
, sec
, link_order
)
2272 struct bfd_link_info
*info
;
2274 struct bfd_link_order
*link_order
;
2278 if (! info
->relocateable
)
2280 if (sec
->orelocation
== (arelent
**) NULL
)
2283 r
= (arelent
*) bfd_alloc (abfd
, sizeof (arelent
));
2284 if (r
== (arelent
*) NULL
)
2286 bfd_set_error (bfd_error_no_memory
);
2290 r
->address
= link_order
->offset
;
2291 r
->howto
= bfd_reloc_type_lookup (abfd
, link_order
->u
.reloc
.p
->reloc
);
2294 bfd_set_error (bfd_error_bad_value
);
2298 /* Get the symbol to use for the relocation. */
2299 if (link_order
->type
== bfd_section_reloc_link_order
)
2300 r
->sym_ptr_ptr
= link_order
->u
.reloc
.p
->u
.section
->symbol_ptr_ptr
;
2303 struct generic_link_hash_entry
*h
;
2305 h
= _bfd_generic_link_hash_lookup (_bfd_generic_hash_table (info
),
2306 link_order
->u
.reloc
.p
->u
.name
,
2307 false, false, true);
2308 if (h
== (struct generic_link_hash_entry
*) NULL
2311 if (! ((*info
->callbacks
->unattached_reloc
)
2312 (info
, link_order
->u
.reloc
.p
->u
.name
,
2313 (bfd
*) NULL
, (asection
*) NULL
, (bfd_vma
) 0)))
2315 bfd_set_error (bfd_error_bad_value
);
2318 r
->sym_ptr_ptr
= &h
->sym
;
2321 /* If this is an inplace reloc, write the addend to the object file.
2322 Otherwise, store it in the reloc addend. */
2323 if (! r
->howto
->partial_inplace
)
2324 r
->addend
= link_order
->u
.reloc
.p
->addend
;
2328 bfd_reloc_status_type rstat
;
2332 size
= bfd_get_reloc_size (r
->howto
);
2333 buf
= (bfd_byte
*) bfd_zmalloc (size
);
2334 if (buf
== (bfd_byte
*) NULL
)
2336 bfd_set_error (bfd_error_no_memory
);
2339 rstat
= _bfd_relocate_contents (r
->howto
, abfd
,
2340 link_order
->u
.reloc
.p
->addend
, buf
);
2346 case bfd_reloc_outofrange
:
2348 case bfd_reloc_overflow
:
2349 if (! ((*info
->callbacks
->reloc_overflow
)
2351 (link_order
->type
== bfd_section_reloc_link_order
2352 ? bfd_section_name (abfd
, link_order
->u
.reloc
.p
->u
.section
)
2353 : link_order
->u
.reloc
.p
->u
.name
),
2354 r
->howto
->name
, link_order
->u
.reloc
.p
->addend
,
2355 (bfd
*) NULL
, (asection
*) NULL
, (bfd_vma
) 0)))
2362 ok
= bfd_set_section_contents (abfd
, sec
, (PTR
) buf
,
2363 (file_ptr
) link_order
->offset
, size
);
2371 sec
->orelocation
[sec
->reloc_count
] = r
;
2377 /* Allocate a new link_order for a section. */
2379 struct bfd_link_order
*
2380 bfd_new_link_order (abfd
, section
)
2384 struct bfd_link_order
*new;
2386 new = ((struct bfd_link_order
*)
2387 bfd_alloc_by_size_t (abfd
, sizeof (struct bfd_link_order
)));
2390 bfd_set_error (bfd_error_no_memory
);
2394 new->type
= bfd_undefined_link_order
;
2397 new->next
= (struct bfd_link_order
*) NULL
;
2399 if (section
->link_order_tail
!= (struct bfd_link_order
*) NULL
)
2400 section
->link_order_tail
->next
= new;
2402 section
->link_order_head
= new;
2403 section
->link_order_tail
= new;
2408 /* Default link order processing routine. Note that we can not handle
2409 the reloc_link_order types here, since they depend upon the details
2410 of how the particular backends generates relocs. */
2413 _bfd_default_link_order (abfd
, info
, sec
, link_order
)
2415 struct bfd_link_info
*info
;
2417 struct bfd_link_order
*link_order
;
2419 switch (link_order
->type
)
2421 case bfd_undefined_link_order
:
2422 case bfd_section_reloc_link_order
:
2423 case bfd_symbol_reloc_link_order
:
2426 case bfd_indirect_link_order
:
2427 return default_indirect_link_order (abfd
, info
, sec
, link_order
,
2429 case bfd_fill_link_order
:
2430 return default_fill_link_order (abfd
, info
, sec
, link_order
);
2431 case bfd_data_link_order
:
2432 return bfd_set_section_contents (abfd
, sec
,
2433 (PTR
) link_order
->u
.data
.contents
,
2434 (file_ptr
) link_order
->offset
,
2439 /* Default routine to handle a bfd_fill_link_order. */
2443 default_fill_link_order (abfd
, info
, sec
, link_order
)
2445 struct bfd_link_info
*info
;
2447 struct bfd_link_order
*link_order
;
2455 BFD_ASSERT ((sec
->flags
& SEC_HAS_CONTENTS
) != 0);
2457 size
= (size_t) link_order
->size
;
2458 space
= (char *) malloc (size
);
2459 if (space
== NULL
&& size
!= 0)
2461 bfd_set_error (bfd_error_no_memory
);
2465 fill
= link_order
->u
.fill
.value
;
2466 for (i
= 0; i
< size
; i
+= 2)
2467 space
[i
] = fill
>> 8;
2468 for (i
= 1; i
< size
; i
+= 2)
2470 result
= bfd_set_section_contents (abfd
, sec
, space
,
2471 (file_ptr
) link_order
->offset
,
2477 /* Default routine to handle a bfd_indirect_link_order. */
2480 default_indirect_link_order (output_bfd
, info
, output_section
, link_order
,
2483 struct bfd_link_info
*info
;
2484 asection
*output_section
;
2485 struct bfd_link_order
*link_order
;
2486 boolean generic_linker
;
2488 asection
*input_section
;
2490 bfd_byte
*contents
= NULL
;
2491 bfd_byte
*new_contents
;
2493 BFD_ASSERT ((output_section
->flags
& SEC_HAS_CONTENTS
) != 0);
2495 if (link_order
->size
== 0)
2498 input_section
= link_order
->u
.indirect
.section
;
2499 input_bfd
= input_section
->owner
;
2501 BFD_ASSERT (input_section
->output_section
== output_section
);
2502 BFD_ASSERT (input_section
->output_offset
== link_order
->offset
);
2503 BFD_ASSERT (input_section
->_cooked_size
== link_order
->size
);
2505 if (info
->relocateable
2506 && input_section
->reloc_count
> 0
2507 && output_section
->orelocation
== (arelent
**) NULL
)
2509 /* Space has not been allocated for the output relocations.
2510 This can happen when we are called by a specific backend
2511 because somebody is attempting to link together different
2512 types of object files. Handling this case correctly is
2513 difficult, and sometimes impossible. */
2517 if (! generic_linker
)
2522 /* Get the canonical symbols. The generic linker will always
2523 have retrieved them by this point, but we are being called by
2524 a specific linker, presumably because we are linking
2525 different types of object files together. */
2526 if (! generic_link_read_symbols (input_bfd
))
2529 /* Since we have been called by a specific linker, rather than
2530 the generic linker, the values of the symbols will not be
2531 right. They will be the values as seen in the input file,
2532 not the values of the final link. We need to fix them up
2533 before we can relocate the section. */
2534 sympp
= _bfd_generic_link_get_symbols (input_bfd
);
2535 symppend
= sympp
+ _bfd_generic_link_get_symcount (input_bfd
);
2536 for (; sympp
< symppend
; sympp
++)
2539 struct bfd_link_hash_entry
*h
;
2543 if ((sym
->flags
& (BSF_INDIRECT
2548 || bfd_is_und_section (bfd_get_section (sym
))
2549 || bfd_is_com_section (bfd_get_section (sym
))
2550 || bfd_is_ind_section (bfd_get_section (sym
)))
2552 /* sym->udata may have been set by
2553 generic_link_add_symbol_list. */
2554 if (sym
->udata
.p
!= NULL
)
2555 h
= (struct bfd_link_hash_entry
*) sym
->udata
.p
;
2557 h
= bfd_link_hash_lookup (info
->hash
,
2558 bfd_asymbol_name (sym
),
2559 false, false, true);
2561 set_symbol_from_hash (sym
, h
);
2566 /* Get and relocate the section contents. */
2567 contents
= (bfd_byte
*) malloc (bfd_section_size (input_bfd
, input_section
));
2568 if (contents
== NULL
&& bfd_section_size (input_bfd
, input_section
) != 0)
2570 bfd_set_error (bfd_error_no_memory
);
2573 new_contents
= (bfd_get_relocated_section_contents
2574 (output_bfd
, info
, link_order
, contents
, info
->relocateable
,
2575 _bfd_generic_link_get_symbols (input_bfd
)));
2579 /* Output the section contents. */
2580 if (! bfd_set_section_contents (output_bfd
, output_section
,
2582 link_order
->offset
, link_order
->size
))
2585 if (contents
!= NULL
)
2590 if (contents
!= NULL
)
2595 /* A little routine to count the number of relocs in a link_order
2599 _bfd_count_link_order_relocs (link_order
)
2600 struct bfd_link_order
*link_order
;
2602 register unsigned int c
;
2603 register struct bfd_link_order
*l
;
2606 for (l
= link_order
; l
!= (struct bfd_link_order
*) NULL
; l
= l
->next
)
2608 if (l
->type
== bfd_section_reloc_link_order
2609 || l
->type
== bfd_symbol_reloc_link_order
)