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252b5132 | 1 | /* linker.c -- BFD linker routines |
2571583a | 2 | Copyright (C) 1993-2017 Free Software Foundation, Inc. |
252b5132 RH |
3 | Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support |
4 | ||
5ed6aba4 | 5 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 6 | |
5ed6aba4 NC |
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 | |
cd123cb7 | 9 | the Free Software Foundation; either version 3 of the License, or |
5ed6aba4 | 10 | (at your option) any later version. |
252b5132 | 11 | |
5ed6aba4 NC |
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. | |
252b5132 | 16 | |
5ed6aba4 NC |
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 | |
cd123cb7 NC |
19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
20 | MA 02110-1301, USA. */ | |
252b5132 | 21 | |
252b5132 | 22 | #include "sysdep.h" |
3db64b00 | 23 | #include "bfd.h" |
252b5132 RH |
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 | ||
509945ae | 63 | @menu |
252b5132 RH |
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 | |
dc1bc0c9 | 78 | <<bfdlink.c>>. @xref{Hash Tables}, for information on how to |
252b5132 RH |
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 | |
1049f94e | 91 | (this index number is used so that when doing a relocatable |
252b5132 RH |
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 | |
f13a99db AM |
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. | |
252b5132 RH |
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 | |
f13a99db | 166 | check the output bfd before saving information (in this |
252b5132 RH |
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 | |
b34976b6 | 203 | <<keep_memory>> field of the <<info>> argument is TRUE, so |
252b5132 RH |
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 | |
5d3236ee DK |
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.) | |
252b5132 RH |
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 | |
13e570f8 | 232 | <<_bfd_generic_link_add_archive_symbols>> function. |
252b5132 RH |
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 | |
13e570f8 | 236 | symbols to the linker hash table. If the element is to |
252b5132 RH |
237 | be included, the <<add_archive_element>> linker callback |
238 | routine must be called with the element as an argument, and | |
5d3236ee | 239 | the element's symbols must be added to the linker hash table |
252b5132 | 240 | just as though the element had itself been passed to the |
13e570f8 | 241 | <<_bfd_link_add_symbols>> function. |
252b5132 RH |
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 | |
5d3236ee DK |
253 | linker hash table - possibly those of a substitute BFD, if the |
254 | <<add_archive_element>> callback avails itself of that option. | |
252b5132 RH |
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 | |
1049f94e | 276 | hash table. When producing relocatable output, it must |
252b5132 RH |
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 | |
c72f2fb2 | 304 | link. These files are linked through the <<link.next>> field |
252b5132 RH |
305 | of the <<bfd>> structure. |
306 | ||
307 | Each section in the output file will have a list of | |
8423293d | 308 | <<link_order>> structures attached to the <<map_head.link_order>> |
252b5132 RH |
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 | |
1049f94e | 316 | while generating a relocatable object file. |
252b5132 RH |
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 | |
1049f94e | 338 | section contents. If performing a relocatable link, the |
252b5132 RH |
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 | ||
b34976b6 | 405 | static bfd_boolean generic_link_add_object_symbols |
b9fc2576 | 406 | (bfd *, struct bfd_link_info *); |
b34976b6 | 407 | static bfd_boolean generic_link_check_archive_element |
13e570f8 | 408 | (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *, const char *, |
b9fc2576 | 409 | bfd_boolean *); |
b34976b6 | 410 | static bfd_boolean generic_link_add_symbol_list |
b9fc2576 | 411 | (bfd *, struct bfd_link_info *, bfd_size_type count, asymbol **); |
b34976b6 | 412 | static bfd_boolean generic_add_output_symbol |
c58b9523 | 413 | (bfd *, size_t *psymalloc, asymbol *); |
b34976b6 | 414 | static bfd_boolean default_data_link_order |
c58b9523 | 415 | (bfd *, struct bfd_link_info *, asection *, struct bfd_link_order *); |
b34976b6 | 416 | static bfd_boolean default_indirect_link_order |
c58b9523 AM |
417 | (bfd *, struct bfd_link_info *, asection *, struct bfd_link_order *, |
418 | bfd_boolean); | |
252b5132 RH |
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 * | |
c58b9523 AM |
427 | _bfd_link_hash_newfunc (struct bfd_hash_entry *entry, |
428 | struct bfd_hash_table *table, | |
429 | const char *string) | |
252b5132 | 430 | { |
252b5132 RH |
431 | /* Allocate the structure if it has not already been allocated by a |
432 | subclass. */ | |
51b64d56 AM |
433 | if (entry == NULL) |
434 | { | |
a50b1753 NC |
435 | entry = (struct bfd_hash_entry *) |
436 | bfd_hash_allocate (table, sizeof (struct bfd_link_hash_entry)); | |
51b64d56 AM |
437 | if (entry == NULL) |
438 | return entry; | |
439 | } | |
252b5132 RH |
440 | |
441 | /* Call the allocation method of the superclass. */ | |
51b64d56 AM |
442 | entry = bfd_hash_newfunc (entry, table, string); |
443 | if (entry) | |
252b5132 | 444 | { |
51b64d56 AM |
445 | struct bfd_link_hash_entry *h = (struct bfd_link_hash_entry *) entry; |
446 | ||
252b5132 | 447 | /* Initialize the local fields. */ |
35ed3f94 AM |
448 | memset ((char *) &h->root + sizeof (h->root), 0, |
449 | sizeof (*h) - sizeof (h->root)); | |
252b5132 RH |
450 | } |
451 | ||
51b64d56 | 452 | return entry; |
252b5132 RH |
453 | } |
454 | ||
455 | /* Initialize a link hash table. The BFD argument is the one | |
456 | responsible for creating this table. */ | |
457 | ||
b34976b6 | 458 | bfd_boolean |
c58b9523 AM |
459 | _bfd_link_hash_table_init |
460 | (struct bfd_link_hash_table *table, | |
f13a99db | 461 | bfd *abfd ATTRIBUTE_UNUSED, |
c58b9523 AM |
462 | struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *, |
463 | struct bfd_hash_table *, | |
66eb6687 AM |
464 | const char *), |
465 | unsigned int entsize) | |
252b5132 | 466 | { |
d495ab0d AM |
467 | bfd_boolean ret; |
468 | ||
469 | BFD_ASSERT (!abfd->is_linker_output && !abfd->link.hash); | |
252b5132 RH |
470 | table->undefs = NULL; |
471 | table->undefs_tail = NULL; | |
8ea2e4bd NC |
472 | table->type = bfd_link_generic_hash_table; |
473 | ||
d495ab0d AM |
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; | |
252b5132 RH |
483 | } |
484 | ||
b34976b6 | 485 | /* Look up a symbol in a link hash table. If follow is TRUE, we |
252b5132 RH |
486 | follow bfd_link_hash_indirect and bfd_link_hash_warning links to |
487 | the real symbol. */ | |
488 | ||
489 | struct bfd_link_hash_entry * | |
c58b9523 AM |
490 | bfd_link_hash_lookup (struct bfd_link_hash_table *table, |
491 | const char *string, | |
492 | bfd_boolean create, | |
493 | bfd_boolean copy, | |
494 | bfd_boolean follow) | |
252b5132 RH |
495 | { |
496 | struct bfd_link_hash_entry *ret; | |
497 | ||
498 | ret = ((struct bfd_link_hash_entry *) | |
499 | bfd_hash_lookup (&table->table, string, create, copy)); | |
500 | ||
c58b9523 | 501 | if (follow && ret != NULL) |
252b5132 RH |
502 | { |
503 | while (ret->type == bfd_link_hash_indirect | |
504 | || ret->type == bfd_link_hash_warning) | |
505 | ret = ret->u.i.link; | |
506 | } | |
507 | ||
508 | return ret; | |
509 | } | |
510 | ||
511 | /* Look up a symbol in the main linker hash table if the symbol might | |
512 | be wrapped. This should only be used for references to an | |
513 | undefined symbol, not for definitions of a symbol. */ | |
514 | ||
515 | struct bfd_link_hash_entry * | |
c58b9523 AM |
516 | bfd_wrapped_link_hash_lookup (bfd *abfd, |
517 | struct bfd_link_info *info, | |
518 | const char *string, | |
519 | bfd_boolean create, | |
520 | bfd_boolean copy, | |
521 | bfd_boolean follow) | |
252b5132 | 522 | { |
dc810e39 AM |
523 | bfd_size_type amt; |
524 | ||
252b5132 RH |
525 | if (info->wrap_hash != NULL) |
526 | { | |
527 | const char *l; | |
b9cf773d | 528 | char prefix = '\0'; |
252b5132 RH |
529 | |
530 | l = string; | |
b9cf773d AM |
531 | if (*l == bfd_get_symbol_leading_char (abfd) || *l == info->wrap_char) |
532 | { | |
533 | prefix = *l; | |
534 | ++l; | |
535 | } | |
252b5132 RH |
536 | |
537 | #undef WRAP | |
538 | #define WRAP "__wrap_" | |
539 | ||
b34976b6 | 540 | if (bfd_hash_lookup (info->wrap_hash, l, FALSE, FALSE) != NULL) |
252b5132 RH |
541 | { |
542 | char *n; | |
543 | struct bfd_link_hash_entry *h; | |
544 | ||
545 | /* This symbol is being wrapped. We want to replace all | |
546 | references to SYM with references to __wrap_SYM. */ | |
547 | ||
dc810e39 | 548 | amt = strlen (l) + sizeof WRAP + 1; |
a50b1753 | 549 | n = (char *) bfd_malloc (amt); |
252b5132 RH |
550 | if (n == NULL) |
551 | return NULL; | |
552 | ||
b9cf773d | 553 | n[0] = prefix; |
252b5132 RH |
554 | n[1] = '\0'; |
555 | strcat (n, WRAP); | |
556 | strcat (n, l); | |
b34976b6 | 557 | h = bfd_link_hash_lookup (info->hash, n, create, TRUE, follow); |
252b5132 RH |
558 | free (n); |
559 | return h; | |
560 | } | |
561 | ||
0112cd26 | 562 | #undef REAL |
252b5132 RH |
563 | #define REAL "__real_" |
564 | ||
565 | if (*l == '_' | |
0112cd26 | 566 | && CONST_STRNEQ (l, REAL) |
252b5132 | 567 | && bfd_hash_lookup (info->wrap_hash, l + sizeof REAL - 1, |
b34976b6 | 568 | FALSE, FALSE) != NULL) |
252b5132 RH |
569 | { |
570 | char *n; | |
571 | struct bfd_link_hash_entry *h; | |
572 | ||
573 | /* This is a reference to __real_SYM, where SYM is being | |
574 | wrapped. We want to replace all references to __real_SYM | |
575 | with references to SYM. */ | |
576 | ||
dc810e39 | 577 | amt = strlen (l + sizeof REAL - 1) + 2; |
a50b1753 | 578 | n = (char *) bfd_malloc (amt); |
252b5132 RH |
579 | if (n == NULL) |
580 | return NULL; | |
581 | ||
b9cf773d | 582 | n[0] = prefix; |
252b5132 RH |
583 | n[1] = '\0'; |
584 | strcat (n, l + sizeof REAL - 1); | |
b34976b6 | 585 | h = bfd_link_hash_lookup (info->hash, n, create, TRUE, follow); |
252b5132 RH |
586 | free (n); |
587 | return h; | |
588 | } | |
589 | ||
590 | #undef REAL | |
591 | } | |
592 | ||
593 | return bfd_link_hash_lookup (info->hash, string, create, copy, follow); | |
594 | } | |
595 | ||
8a5da09b AM |
596 | /* If H is a wrapped symbol, ie. the symbol name starts with "__wrap_" |
597 | and the remainder is found in wrap_hash, return the real symbol. */ | |
598 | ||
599 | struct bfd_link_hash_entry * | |
600 | unwrap_hash_lookup (struct bfd_link_info *info, | |
601 | bfd *input_bfd, | |
602 | struct bfd_link_hash_entry *h) | |
603 | { | |
604 | const char *l = h->root.string; | |
605 | ||
606 | if (*l == bfd_get_symbol_leading_char (input_bfd) | |
607 | || *l == info->wrap_char) | |
608 | ++l; | |
609 | ||
610 | if (CONST_STRNEQ (l, WRAP)) | |
611 | { | |
612 | l += sizeof WRAP - 1; | |
613 | ||
614 | if (bfd_hash_lookup (info->wrap_hash, l, FALSE, FALSE) != NULL) | |
615 | { | |
616 | char save = 0; | |
7ed689ad | 617 | if (l - (sizeof WRAP - 1) != h->root.string) |
8a5da09b AM |
618 | { |
619 | --l; | |
620 | save = *l; | |
621 | *(char *) l = *h->root.string; | |
622 | } | |
623 | h = bfd_link_hash_lookup (info->hash, l, FALSE, FALSE, FALSE); | |
624 | if (save) | |
625 | *(char *) l = save; | |
626 | } | |
627 | } | |
628 | return h; | |
629 | } | |
630 | #undef WRAP | |
631 | ||
7686d77d AM |
632 | /* Traverse a generic link hash table. Differs from bfd_hash_traverse |
633 | in the treatment of warning symbols. When warning symbols are | |
634 | created they replace the real symbol, so you don't get to see the | |
635 | real symbol in a bfd_hash_travere. This traversal calls func with | |
636 | the real symbol. */ | |
252b5132 | 637 | |
509945ae | 638 | void |
c58b9523 | 639 | bfd_link_hash_traverse |
7686d77d | 640 | (struct bfd_link_hash_table *htab, |
c58b9523 AM |
641 | bfd_boolean (*func) (struct bfd_link_hash_entry *, void *), |
642 | void *info) | |
252b5132 | 643 | { |
7686d77d AM |
644 | unsigned int i; |
645 | ||
646 | htab->table.frozen = 1; | |
647 | for (i = 0; i < htab->table.size; i++) | |
648 | { | |
649 | struct bfd_link_hash_entry *p; | |
650 | ||
651 | p = (struct bfd_link_hash_entry *) htab->table.table[i]; | |
652 | for (; p != NULL; p = (struct bfd_link_hash_entry *) p->root.next) | |
653 | if (!(*func) (p->type == bfd_link_hash_warning ? p->u.i.link : p, info)) | |
654 | goto out; | |
655 | } | |
656 | out: | |
657 | htab->table.frozen = 0; | |
252b5132 RH |
658 | } |
659 | ||
660 | /* Add a symbol to the linker hash table undefs list. */ | |
661 | ||
c58b9523 AM |
662 | void |
663 | bfd_link_add_undef (struct bfd_link_hash_table *table, | |
664 | struct bfd_link_hash_entry *h) | |
252b5132 | 665 | { |
f6e332e6 | 666 | BFD_ASSERT (h->u.undef.next == NULL); |
c58b9523 | 667 | if (table->undefs_tail != NULL) |
f6e332e6 | 668 | table->undefs_tail->u.undef.next = h; |
c58b9523 | 669 | if (table->undefs == NULL) |
252b5132 RH |
670 | table->undefs = h; |
671 | table->undefs_tail = h; | |
672 | } | |
77cfaee6 AM |
673 | |
674 | /* The undefs list was designed so that in normal use we don't need to | |
675 | remove entries. However, if symbols on the list are changed from | |
676 | bfd_link_hash_undefined to either bfd_link_hash_undefweak or | |
677 | bfd_link_hash_new for some reason, then they must be removed from the | |
678 | list. Failure to do so might result in the linker attempting to add | |
679 | the symbol to the list again at a later stage. */ | |
680 | ||
681 | void | |
682 | bfd_link_repair_undef_list (struct bfd_link_hash_table *table) | |
683 | { | |
684 | struct bfd_link_hash_entry **pun; | |
685 | ||
686 | pun = &table->undefs; | |
687 | while (*pun != NULL) | |
688 | { | |
689 | struct bfd_link_hash_entry *h = *pun; | |
690 | ||
691 | if (h->type == bfd_link_hash_new | |
692 | || h->type == bfd_link_hash_undefweak) | |
693 | { | |
694 | *pun = h->u.undef.next; | |
695 | h->u.undef.next = NULL; | |
696 | if (h == table->undefs_tail) | |
697 | { | |
698 | if (pun == &table->undefs) | |
699 | table->undefs_tail = NULL; | |
700 | else | |
701 | /* pun points at an u.undef.next field. Go back to | |
702 | the start of the link_hash_entry. */ | |
703 | table->undefs_tail = (struct bfd_link_hash_entry *) | |
704 | ((char *) pun - ((char *) &h->u.undef.next - (char *) h)); | |
705 | break; | |
706 | } | |
707 | } | |
708 | else | |
709 | pun = &h->u.undef.next; | |
710 | } | |
711 | } | |
252b5132 | 712 | \f |
19852a2a | 713 | /* Routine to create an entry in a generic link hash table. */ |
252b5132 RH |
714 | |
715 | struct bfd_hash_entry * | |
c58b9523 AM |
716 | _bfd_generic_link_hash_newfunc (struct bfd_hash_entry *entry, |
717 | struct bfd_hash_table *table, | |
718 | const char *string) | |
252b5132 | 719 | { |
252b5132 RH |
720 | /* Allocate the structure if it has not already been allocated by a |
721 | subclass. */ | |
51b64d56 AM |
722 | if (entry == NULL) |
723 | { | |
a50b1753 | 724 | entry = (struct bfd_hash_entry *) |
d45913a0 | 725 | bfd_hash_allocate (table, sizeof (struct generic_link_hash_entry)); |
51b64d56 AM |
726 | if (entry == NULL) |
727 | return entry; | |
728 | } | |
252b5132 RH |
729 | |
730 | /* Call the allocation method of the superclass. */ | |
51b64d56 AM |
731 | entry = _bfd_link_hash_newfunc (entry, table, string); |
732 | if (entry) | |
252b5132 | 733 | { |
51b64d56 AM |
734 | struct generic_link_hash_entry *ret; |
735 | ||
252b5132 | 736 | /* Set local fields. */ |
51b64d56 | 737 | ret = (struct generic_link_hash_entry *) entry; |
b34976b6 | 738 | ret->written = FALSE; |
252b5132 RH |
739 | ret->sym = NULL; |
740 | } | |
741 | ||
51b64d56 | 742 | return entry; |
252b5132 RH |
743 | } |
744 | ||
19852a2a | 745 | /* Create a generic link hash table. */ |
252b5132 RH |
746 | |
747 | struct bfd_link_hash_table * | |
c58b9523 | 748 | _bfd_generic_link_hash_table_create (bfd *abfd) |
252b5132 RH |
749 | { |
750 | struct generic_link_hash_table *ret; | |
dc810e39 | 751 | bfd_size_type amt = sizeof (struct generic_link_hash_table); |
252b5132 | 752 | |
a50b1753 | 753 | ret = (struct generic_link_hash_table *) bfd_malloc (amt); |
252b5132 | 754 | if (ret == NULL) |
c58b9523 | 755 | return NULL; |
252b5132 | 756 | if (! _bfd_link_hash_table_init (&ret->root, abfd, |
66eb6687 AM |
757 | _bfd_generic_link_hash_newfunc, |
758 | sizeof (struct generic_link_hash_entry))) | |
252b5132 RH |
759 | { |
760 | free (ret); | |
c58b9523 | 761 | return NULL; |
252b5132 RH |
762 | } |
763 | return &ret->root; | |
764 | } | |
765 | ||
e2d34d7d | 766 | void |
d495ab0d | 767 | _bfd_generic_link_hash_table_free (bfd *obfd) |
e2d34d7d | 768 | { |
d495ab0d | 769 | struct generic_link_hash_table *ret; |
e2d34d7d | 770 | |
d495ab0d AM |
771 | BFD_ASSERT (obfd->is_linker_output && obfd->link.hash); |
772 | ret = (struct generic_link_hash_table *) obfd->link.hash; | |
e2d34d7d DJ |
773 | bfd_hash_table_free (&ret->root.table); |
774 | free (ret); | |
d495ab0d AM |
775 | obfd->link.hash = NULL; |
776 | obfd->is_linker_output = FALSE; | |
e2d34d7d DJ |
777 | } |
778 | ||
252b5132 RH |
779 | /* Grab the symbols for an object file when doing a generic link. We |
780 | store the symbols in the outsymbols field. We need to keep them | |
781 | around for the entire link to ensure that we only read them once. | |
782 | If we read them multiple times, we might wind up with relocs and | |
783 | the hash table pointing to different instances of the symbol | |
784 | structure. */ | |
785 | ||
5c1d2f5f AM |
786 | bfd_boolean |
787 | bfd_generic_link_read_symbols (bfd *abfd) | |
252b5132 | 788 | { |
c58b9523 | 789 | if (bfd_get_outsymbols (abfd) == NULL) |
252b5132 RH |
790 | { |
791 | long symsize; | |
792 | long symcount; | |
793 | ||
794 | symsize = bfd_get_symtab_upper_bound (abfd); | |
795 | if (symsize < 0) | |
b34976b6 | 796 | return FALSE; |
a50b1753 NC |
797 | bfd_get_outsymbols (abfd) = (struct bfd_symbol **) bfd_alloc (abfd, |
798 | symsize); | |
252b5132 | 799 | if (bfd_get_outsymbols (abfd) == NULL && symsize != 0) |
b34976b6 | 800 | return FALSE; |
252b5132 RH |
801 | symcount = bfd_canonicalize_symtab (abfd, bfd_get_outsymbols (abfd)); |
802 | if (symcount < 0) | |
b34976b6 | 803 | return FALSE; |
252b5132 RH |
804 | bfd_get_symcount (abfd) = symcount; |
805 | } | |
806 | ||
b34976b6 | 807 | return TRUE; |
252b5132 RH |
808 | } |
809 | \f | |
2d653fc7 AM |
810 | /* Indicate that we are only retrieving symbol values from this |
811 | section. We want the symbols to act as though the values in the | |
812 | file are absolute. */ | |
813 | ||
814 | void | |
c58b9523 AM |
815 | _bfd_generic_link_just_syms (asection *sec, |
816 | struct bfd_link_info *info ATTRIBUTE_UNUSED) | |
2d653fc7 | 817 | { |
dbaa2011 | 818 | sec->sec_info_type = SEC_INFO_TYPE_JUST_SYMS; |
2d653fc7 AM |
819 | sec->output_section = bfd_abs_section_ptr; |
820 | sec->output_offset = sec->vma; | |
821 | } | |
822 | ||
bffebb6b AM |
823 | /* Copy the symbol type and other attributes for a linker script |
824 | assignment from HSRC to HDEST. | |
1338dd10 PB |
825 | The default implementation does nothing. */ |
826 | void | |
827 | _bfd_generic_copy_link_hash_symbol_type (bfd *abfd ATTRIBUTE_UNUSED, | |
bffebb6b AM |
828 | struct bfd_link_hash_entry *hdest ATTRIBUTE_UNUSED, |
829 | struct bfd_link_hash_entry *hsrc ATTRIBUTE_UNUSED) | |
1338dd10 PB |
830 | { |
831 | } | |
832 | ||
b9fc2576 AM |
833 | /* Generic function to add symbols from an object file to the |
834 | global hash table. */ | |
252b5132 | 835 | |
b9fc2576 AM |
836 | bfd_boolean |
837 | _bfd_generic_link_add_symbols (bfd *abfd, struct bfd_link_info *info) | |
252b5132 | 838 | { |
b34976b6 | 839 | bfd_boolean ret; |
252b5132 RH |
840 | |
841 | switch (bfd_get_format (abfd)) | |
842 | { | |
843 | case bfd_object: | |
b9fc2576 | 844 | ret = generic_link_add_object_symbols (abfd, info); |
252b5132 RH |
845 | break; |
846 | case bfd_archive: | |
847 | ret = (_bfd_generic_link_add_archive_symbols | |
b9fc2576 | 848 | (abfd, info, generic_link_check_archive_element)); |
252b5132 RH |
849 | break; |
850 | default: | |
851 | bfd_set_error (bfd_error_wrong_format); | |
b34976b6 | 852 | ret = FALSE; |
252b5132 RH |
853 | } |
854 | ||
855 | return ret; | |
856 | } | |
857 | ||
858 | /* Add symbols from an object file to the global hash table. */ | |
859 | ||
b34976b6 | 860 | static bfd_boolean |
c58b9523 | 861 | generic_link_add_object_symbols (bfd *abfd, |
b9fc2576 | 862 | struct bfd_link_info *info) |
252b5132 | 863 | { |
dc810e39 | 864 | bfd_size_type symcount; |
fc0a2244 | 865 | struct bfd_symbol **outsyms; |
dc810e39 | 866 | |
5c1d2f5f | 867 | if (!bfd_generic_link_read_symbols (abfd)) |
b34976b6 | 868 | return FALSE; |
dc810e39 AM |
869 | symcount = _bfd_generic_link_get_symcount (abfd); |
870 | outsyms = _bfd_generic_link_get_symbols (abfd); | |
b9fc2576 | 871 | return generic_link_add_symbol_list (abfd, info, symcount, outsyms); |
252b5132 RH |
872 | } |
873 | \f | |
252b5132 RH |
874 | /* Generic function to add symbols from an archive file to the global |
875 | hash file. This function presumes that the archive symbol table | |
876 | has already been read in (this is normally done by the | |
13e570f8 AM |
877 | bfd_check_format entry point). It looks through the archive symbol |
878 | table for symbols that are undefined or common in the linker global | |
879 | symbol hash table. When one is found, the CHECKFN argument is used | |
880 | to see if an object file should be included. This allows targets | |
881 | to customize common symbol behaviour. CHECKFN should set *PNEEDED | |
882 | to TRUE if the object file should be included, and must also call | |
883 | the bfd_link_info add_archive_element callback function and handle | |
884 | adding the symbols to the global hash table. CHECKFN must notice | |
885 | if the callback indicates a substitute BFD, and arrange to add | |
886 | those symbols instead if it does so. CHECKFN should only return | |
887 | FALSE if some sort of error occurs. */ | |
252b5132 | 888 | |
b34976b6 | 889 | bfd_boolean |
c58b9523 AM |
890 | _bfd_generic_link_add_archive_symbols |
891 | (bfd *abfd, | |
892 | struct bfd_link_info *info, | |
13e570f8 AM |
893 | bfd_boolean (*checkfn) (bfd *, struct bfd_link_info *, |
894 | struct bfd_link_hash_entry *, const char *, | |
895 | bfd_boolean *)) | |
252b5132 | 896 | { |
13e570f8 AM |
897 | bfd_boolean loop; |
898 | bfd_size_type amt; | |
899 | unsigned char *included; | |
252b5132 RH |
900 | |
901 | if (! bfd_has_map (abfd)) | |
902 | { | |
903 | /* An empty archive is a special case. */ | |
c58b9523 | 904 | if (bfd_openr_next_archived_file (abfd, NULL) == NULL) |
b34976b6 | 905 | return TRUE; |
252b5132 | 906 | bfd_set_error (bfd_error_no_armap); |
b34976b6 | 907 | return FALSE; |
252b5132 RH |
908 | } |
909 | ||
13e570f8 AM |
910 | amt = bfd_ardata (abfd)->symdef_count; |
911 | if (amt == 0) | |
912 | return TRUE; | |
913 | amt *= sizeof (*included); | |
914 | included = (unsigned char *) bfd_zmalloc (amt); | |
915 | if (included == NULL) | |
b34976b6 | 916 | return FALSE; |
252b5132 | 917 | |
13e570f8 | 918 | do |
252b5132 | 919 | { |
13e570f8 AM |
920 | carsym *arsyms; |
921 | carsym *arsym_end; | |
922 | carsym *arsym; | |
923 | unsigned int indx; | |
924 | file_ptr last_ar_offset = -1; | |
925 | bfd_boolean needed = FALSE; | |
926 | bfd *element = NULL; | |
927 | ||
928 | loop = FALSE; | |
929 | arsyms = bfd_ardata (abfd)->symdefs; | |
930 | arsym_end = arsyms + bfd_ardata (abfd)->symdef_count; | |
931 | for (arsym = arsyms, indx = 0; arsym < arsym_end; arsym++, indx++) | |
252b5132 | 932 | { |
13e570f8 AM |
933 | struct bfd_link_hash_entry *h; |
934 | struct bfd_link_hash_entry *undefs_tail; | |
252b5132 | 935 | |
13e570f8 AM |
936 | if (included[indx]) |
937 | continue; | |
938 | if (needed && arsym->file_offset == last_ar_offset) | |
8ceb7a1b | 939 | { |
13e570f8 | 940 | included[indx] = 1; |
8ceb7a1b CW |
941 | continue; |
942 | } | |
252b5132 | 943 | |
13e570f8 AM |
944 | h = bfd_link_hash_lookup (info->hash, arsym->name, |
945 | FALSE, FALSE, TRUE); | |
252b5132 | 946 | |
13e570f8 AM |
947 | if (h == NULL |
948 | && info->pei386_auto_import | |
949 | && CONST_STRNEQ (arsym->name, "__imp_")) | |
950 | h = bfd_link_hash_lookup (info->hash, arsym->name + 6, | |
951 | FALSE, FALSE, TRUE); | |
952 | if (h == NULL) | |
252b5132 RH |
953 | continue; |
954 | ||
13e570f8 AM |
955 | if (h->type != bfd_link_hash_undefined |
956 | && h->type != bfd_link_hash_common) | |
252b5132 | 957 | { |
13e570f8 AM |
958 | if (h->type != bfd_link_hash_undefweak) |
959 | /* Symbol must be defined. Don't check it again. */ | |
960 | included[indx] = 1; | |
252b5132 RH |
961 | continue; |
962 | } | |
963 | ||
13e570f8 AM |
964 | if (last_ar_offset != arsym->file_offset) |
965 | { | |
966 | last_ar_offset = arsym->file_offset; | |
967 | element = _bfd_get_elt_at_filepos (abfd, last_ar_offset); | |
968 | if (element == NULL | |
969 | || !bfd_check_format (element, bfd_object)) | |
970 | goto error_return; | |
971 | } | |
972 | ||
973 | undefs_tail = info->hash->undefs_tail; | |
974 | ||
252b5132 RH |
975 | /* CHECKFN will see if this element should be included, and |
976 | go ahead and include it if appropriate. */ | |
13e570f8 | 977 | if (! (*checkfn) (element, info, h, arsym->name, &needed)) |
252b5132 RH |
978 | goto error_return; |
979 | ||
13e570f8 | 980 | if (needed) |
252b5132 | 981 | { |
13e570f8 AM |
982 | unsigned int mark; |
983 | ||
984 | /* Look backward to mark all symbols from this object file | |
985 | which we have already seen in this pass. */ | |
986 | mark = indx; | |
987 | do | |
988 | { | |
989 | included[mark] = 1; | |
990 | if (mark == 0) | |
991 | break; | |
992 | --mark; | |
993 | } | |
994 | while (arsyms[mark].file_offset == last_ar_offset); | |
995 | ||
996 | if (undefs_tail != info->hash->undefs_tail) | |
997 | loop = TRUE; | |
252b5132 RH |
998 | } |
999 | } | |
13e570f8 | 1000 | } while (loop); |
252b5132 | 1001 | |
13e570f8 | 1002 | free (included); |
b34976b6 | 1003 | return TRUE; |
252b5132 RH |
1004 | |
1005 | error_return: | |
13e570f8 | 1006 | free (included); |
b34976b6 | 1007 | return FALSE; |
252b5132 RH |
1008 | } |
1009 | \f | |
b9fc2576 | 1010 | /* See if we should include an archive element. */ |
252b5132 | 1011 | |
b34976b6 | 1012 | static bfd_boolean |
c58b9523 AM |
1013 | generic_link_check_archive_element (bfd *abfd, |
1014 | struct bfd_link_info *info, | |
13e570f8 AM |
1015 | struct bfd_link_hash_entry *h, |
1016 | const char *name ATTRIBUTE_UNUSED, | |
b9fc2576 | 1017 | bfd_boolean *pneeded) |
252b5132 RH |
1018 | { |
1019 | asymbol **pp, **ppend; | |
1020 | ||
b34976b6 | 1021 | *pneeded = FALSE; |
252b5132 | 1022 | |
5c1d2f5f | 1023 | if (!bfd_generic_link_read_symbols (abfd)) |
b34976b6 | 1024 | return FALSE; |
252b5132 RH |
1025 | |
1026 | pp = _bfd_generic_link_get_symbols (abfd); | |
1027 | ppend = pp + _bfd_generic_link_get_symcount (abfd); | |
1028 | for (; pp < ppend; pp++) | |
1029 | { | |
1030 | asymbol *p; | |
252b5132 RH |
1031 | |
1032 | p = *pp; | |
1033 | ||
1034 | /* We are only interested in globally visible symbols. */ | |
1035 | if (! bfd_is_com_section (p->section) | |
1036 | && (p->flags & (BSF_GLOBAL | BSF_INDIRECT | BSF_WEAK)) == 0) | |
1037 | continue; | |
1038 | ||
1039 | /* We are only interested if we know something about this | |
1040 | symbol, and it is undefined or common. An undefined weak | |
1041 | symbol (type bfd_link_hash_undefweak) is not considered to be | |
1042 | a reference when pulling files out of an archive. See the | |
1043 | SVR4 ABI, p. 4-27. */ | |
b34976b6 AM |
1044 | h = bfd_link_hash_lookup (info->hash, bfd_asymbol_name (p), FALSE, |
1045 | FALSE, TRUE); | |
c58b9523 | 1046 | if (h == NULL |
252b5132 RH |
1047 | || (h->type != bfd_link_hash_undefined |
1048 | && h->type != bfd_link_hash_common)) | |
1049 | continue; | |
1050 | ||
1051 | /* P is a symbol we are looking for. */ | |
1052 | ||
02eb0a49 AM |
1053 | if (! bfd_is_com_section (p->section) |
1054 | || (h->type == bfd_link_hash_undefined | |
1055 | && h->u.undef.abfd == NULL)) | |
252b5132 | 1056 | { |
02eb0a49 AM |
1057 | /* P is not a common symbol, or an undefined reference was |
1058 | created from outside BFD such as from a linker -u option. | |
1059 | This object file defines the symbol, so pull it in. */ | |
1060 | *pneeded = TRUE; | |
0e144ba7 AM |
1061 | if (!(*info->callbacks |
1062 | ->add_archive_element) (info, abfd, bfd_asymbol_name (p), | |
1063 | &abfd)) | |
b34976b6 | 1064 | return FALSE; |
5d3236ee DK |
1065 | /* Potentially, the add_archive_element hook may have set a |
1066 | substitute BFD for us. */ | |
6eda96bc | 1067 | return bfd_link_add_symbols (abfd, info); |
252b5132 RH |
1068 | } |
1069 | ||
1070 | /* P is a common symbol. */ | |
1071 | ||
1072 | if (h->type == bfd_link_hash_undefined) | |
1073 | { | |
1074 | bfd *symbfd; | |
1075 | bfd_vma size; | |
1076 | unsigned int power; | |
1077 | ||
252b5132 RH |
1078 | /* Turn the symbol into a common symbol but do not link in |
1079 | the object file. This is how a.out works. Object | |
1080 | formats that require different semantics must implement | |
1081 | this function differently. This symbol is already on the | |
1082 | undefs list. We add the section to a common section | |
1083 | attached to symbfd to ensure that it is in a BFD which | |
1084 | will be linked in. */ | |
02eb0a49 | 1085 | symbfd = h->u.undef.abfd; |
252b5132 | 1086 | h->type = bfd_link_hash_common; |
a50b1753 | 1087 | h->u.c.p = (struct bfd_link_hash_common_entry *) |
c58b9523 AM |
1088 | bfd_hash_allocate (&info->hash->table, |
1089 | sizeof (struct bfd_link_hash_common_entry)); | |
252b5132 | 1090 | if (h->u.c.p == NULL) |
b34976b6 | 1091 | return FALSE; |
252b5132 RH |
1092 | |
1093 | size = bfd_asymbol_value (p); | |
1094 | h->u.c.size = size; | |
1095 | ||
1096 | power = bfd_log2 (size); | |
1097 | if (power > 4) | |
1098 | power = 4; | |
1099 | h->u.c.p->alignment_power = power; | |
1100 | ||
1101 | if (p->section == bfd_com_section_ptr) | |
1102 | h->u.c.p->section = bfd_make_section_old_way (symbfd, "COMMON"); | |
1103 | else | |
1104 | h->u.c.p->section = bfd_make_section_old_way (symbfd, | |
1105 | p->section->name); | |
02d00247 | 1106 | h->u.c.p->section->flags |= SEC_ALLOC; |
252b5132 RH |
1107 | } |
1108 | else | |
1109 | { | |
1110 | /* Adjust the size of the common symbol if necessary. This | |
1111 | is how a.out works. Object formats that require | |
1112 | different semantics must implement this function | |
1113 | differently. */ | |
1114 | if (bfd_asymbol_value (p) > h->u.c.size) | |
1115 | h->u.c.size = bfd_asymbol_value (p); | |
1116 | } | |
1117 | } | |
1118 | ||
1119 | /* This archive element is not needed. */ | |
b34976b6 | 1120 | return TRUE; |
252b5132 RH |
1121 | } |
1122 | ||
1123 | /* Add the symbols from an object file to the global hash table. ABFD | |
1124 | is the object file. INFO is the linker information. SYMBOL_COUNT | |
b9fc2576 | 1125 | is the number of symbols. SYMBOLS is the list of symbols. */ |
252b5132 | 1126 | |
b34976b6 | 1127 | static bfd_boolean |
c58b9523 AM |
1128 | generic_link_add_symbol_list (bfd *abfd, |
1129 | struct bfd_link_info *info, | |
1130 | bfd_size_type symbol_count, | |
b9fc2576 | 1131 | asymbol **symbols) |
252b5132 RH |
1132 | { |
1133 | asymbol **pp, **ppend; | |
1134 | ||
1135 | pp = symbols; | |
1136 | ppend = symbols + symbol_count; | |
1137 | for (; pp < ppend; pp++) | |
1138 | { | |
1139 | asymbol *p; | |
1140 | ||
1141 | p = *pp; | |
1142 | ||
1143 | if ((p->flags & (BSF_INDIRECT | |
1144 | | BSF_WARNING | |
1145 | | BSF_GLOBAL | |
1146 | | BSF_CONSTRUCTOR | |
1147 | | BSF_WEAK)) != 0 | |
1148 | || bfd_is_und_section (bfd_get_section (p)) | |
1149 | || bfd_is_com_section (bfd_get_section (p)) | |
1150 | || bfd_is_ind_section (bfd_get_section (p))) | |
1151 | { | |
1152 | const char *name; | |
1153 | const char *string; | |
1154 | struct generic_link_hash_entry *h; | |
14a793b2 | 1155 | struct bfd_link_hash_entry *bh; |
252b5132 | 1156 | |
f08c429c | 1157 | string = name = bfd_asymbol_name (p); |
252b5132 RH |
1158 | if (((p->flags & BSF_INDIRECT) != 0 |
1159 | || bfd_is_ind_section (p->section)) | |
1160 | && pp + 1 < ppend) | |
1161 | { | |
1162 | pp++; | |
1163 | string = bfd_asymbol_name (*pp); | |
1164 | } | |
1165 | else if ((p->flags & BSF_WARNING) != 0 | |
1166 | && pp + 1 < ppend) | |
1167 | { | |
1168 | /* The name of P is actually the warning string, and the | |
1169 | next symbol is the one to warn about. */ | |
252b5132 RH |
1170 | pp++; |
1171 | name = bfd_asymbol_name (*pp); | |
1172 | } | |
252b5132 | 1173 | |
14a793b2 | 1174 | bh = NULL; |
252b5132 RH |
1175 | if (! (_bfd_generic_link_add_one_symbol |
1176 | (info, abfd, name, p->flags, bfd_get_section (p), | |
b9fc2576 | 1177 | p->value, string, FALSE, FALSE, &bh))) |
b34976b6 | 1178 | return FALSE; |
14a793b2 | 1179 | h = (struct generic_link_hash_entry *) bh; |
252b5132 RH |
1180 | |
1181 | /* If this is a constructor symbol, and the linker didn't do | |
1182 | anything with it, then we want to just pass the symbol | |
1183 | through to the output file. This will happen when | |
1184 | linking with -r. */ | |
1185 | if ((p->flags & BSF_CONSTRUCTOR) != 0 | |
1186 | && (h == NULL || h->root.type == bfd_link_hash_new)) | |
1187 | { | |
1188 | p->udata.p = NULL; | |
1189 | continue; | |
1190 | } | |
1191 | ||
1192 | /* Save the BFD symbol so that we don't lose any backend | |
1193 | specific information that may be attached to it. We only | |
1194 | want this one if it gives more information than the | |
1195 | existing one; we don't want to replace a defined symbol | |
1196 | with an undefined one. This routine may be called with a | |
1197 | hash table other than the generic hash table, so we only | |
1198 | do this if we are certain that the hash table is a | |
1199 | generic one. */ | |
f13a99db | 1200 | if (info->output_bfd->xvec == abfd->xvec) |
252b5132 | 1201 | { |
c58b9523 | 1202 | if (h->sym == NULL |
252b5132 RH |
1203 | || (! bfd_is_und_section (bfd_get_section (p)) |
1204 | && (! bfd_is_com_section (bfd_get_section (p)) | |
1205 | || bfd_is_und_section (bfd_get_section (h->sym))))) | |
1206 | { | |
1207 | h->sym = p; | |
1208 | /* BSF_OLD_COMMON is a hack to support COFF reloc | |
1209 | reading, and it should go away when the COFF | |
1210 | linker is switched to the new version. */ | |
1211 | if (bfd_is_com_section (bfd_get_section (p))) | |
1212 | p->flags |= BSF_OLD_COMMON; | |
1213 | } | |
1214 | } | |
1215 | ||
1216 | /* Store a back pointer from the symbol to the hash | |
1217 | table entry for the benefit of relaxation code until | |
1218 | it gets rewritten to not use asymbol structures. | |
1219 | Setting this is also used to check whether these | |
1220 | symbols were set up by the generic linker. */ | |
c58b9523 | 1221 | p->udata.p = h; |
252b5132 RH |
1222 | } |
1223 | } | |
1224 | ||
b34976b6 | 1225 | return TRUE; |
252b5132 RH |
1226 | } |
1227 | \f | |
1228 | /* We use a state table to deal with adding symbols from an object | |
1229 | file. The first index into the state table describes the symbol | |
1230 | from the object file. The second index into the state table is the | |
1231 | type of the symbol in the hash table. */ | |
1232 | ||
1233 | /* The symbol from the object file is turned into one of these row | |
1234 | values. */ | |
1235 | ||
1236 | enum link_row | |
1237 | { | |
1238 | UNDEF_ROW, /* Undefined. */ | |
1239 | UNDEFW_ROW, /* Weak undefined. */ | |
1240 | DEF_ROW, /* Defined. */ | |
1241 | DEFW_ROW, /* Weak defined. */ | |
1242 | COMMON_ROW, /* Common. */ | |
1243 | INDR_ROW, /* Indirect. */ | |
1244 | WARN_ROW, /* Warning. */ | |
1245 | SET_ROW /* Member of set. */ | |
1246 | }; | |
1247 | ||
1248 | /* apparently needed for Hitachi 3050R(HI-UX/WE2)? */ | |
1249 | #undef FAIL | |
1250 | ||
1251 | /* The actions to take in the state table. */ | |
1252 | ||
1253 | enum link_action | |
1254 | { | |
509945ae | 1255 | FAIL, /* Abort. */ |
252b5132 RH |
1256 | UND, /* Mark symbol undefined. */ |
1257 | WEAK, /* Mark symbol weak undefined. */ | |
1258 | DEF, /* Mark symbol defined. */ | |
1259 | DEFW, /* Mark symbol weak defined. */ | |
1260 | COM, /* Mark symbol common. */ | |
1261 | REF, /* Mark defined symbol referenced. */ | |
1262 | CREF, /* Possibly warn about common reference to defined symbol. */ | |
1263 | CDEF, /* Define existing common symbol. */ | |
1264 | NOACT, /* No action. */ | |
1265 | BIG, /* Mark symbol common using largest size. */ | |
1266 | MDEF, /* Multiple definition error. */ | |
1267 | MIND, /* Multiple indirect symbols. */ | |
1268 | IND, /* Make indirect symbol. */ | |
1269 | CIND, /* Make indirect symbol from existing common symbol. */ | |
1270 | SET, /* Add value to set. */ | |
1271 | MWARN, /* Make warning symbol. */ | |
a42e8297 | 1272 | WARN, /* Warn if referenced, else MWARN. */ |
252b5132 RH |
1273 | CYCLE, /* Repeat with symbol pointed to. */ |
1274 | REFC, /* Mark indirect symbol referenced and then CYCLE. */ | |
1275 | WARNC /* Issue warning and then CYCLE. */ | |
1276 | }; | |
1277 | ||
1278 | /* The state table itself. The first index is a link_row and the | |
1279 | second index is a bfd_link_hash_type. */ | |
1280 | ||
1281 | static const enum link_action link_action[8][8] = | |
1282 | { | |
1283 | /* current\prev new undef undefw def defw com indr warn */ | |
1284 | /* UNDEF_ROW */ {UND, NOACT, UND, REF, REF, NOACT, REFC, WARNC }, | |
1285 | /* UNDEFW_ROW */ {WEAK, NOACT, NOACT, REF, REF, NOACT, REFC, WARNC }, | |
1286 | /* DEF_ROW */ {DEF, DEF, DEF, MDEF, DEF, CDEF, MDEF, CYCLE }, | |
1287 | /* DEFW_ROW */ {DEFW, DEFW, DEFW, NOACT, NOACT, NOACT, NOACT, CYCLE }, | |
146f1a87 | 1288 | /* COMMON_ROW */ {COM, COM, COM, CREF, COM, BIG, REFC, WARNC }, |
252b5132 | 1289 | /* INDR_ROW */ {IND, IND, IND, MDEF, IND, CIND, MIND, CYCLE }, |
a42e8297 | 1290 | /* WARN_ROW */ {MWARN, WARN, WARN, WARN, WARN, WARN, WARN, NOACT }, |
252b5132 RH |
1291 | /* SET_ROW */ {SET, SET, SET, SET, SET, SET, CYCLE, CYCLE } |
1292 | }; | |
1293 | ||
1294 | /* Most of the entries in the LINK_ACTION table are straightforward, | |
1295 | but a few are somewhat subtle. | |
1296 | ||
1297 | A reference to an indirect symbol (UNDEF_ROW/indr or | |
1298 | UNDEFW_ROW/indr) is counted as a reference both to the indirect | |
1299 | symbol and to the symbol the indirect symbol points to. | |
1300 | ||
1301 | A reference to a warning symbol (UNDEF_ROW/warn or UNDEFW_ROW/warn) | |
1302 | causes the warning to be issued. | |
1303 | ||
1304 | A common definition of an indirect symbol (COMMON_ROW/indr) is | |
1305 | treated as a multiple definition error. Likewise for an indirect | |
1306 | definition of a common symbol (INDR_ROW/com). | |
1307 | ||
1308 | An indirect definition of a warning (INDR_ROW/warn) does not cause | |
1309 | the warning to be issued. | |
1310 | ||
1311 | If a warning is created for an indirect symbol (WARN_ROW/indr) no | |
1312 | warning is created for the symbol the indirect symbol points to. | |
1313 | ||
1314 | Adding an entry to a set does not count as a reference to a set, | |
1315 | and no warning is issued (SET_ROW/warn). */ | |
1316 | ||
1317 | /* Return the BFD in which a hash entry has been defined, if known. */ | |
1318 | ||
1319 | static bfd * | |
c58b9523 | 1320 | hash_entry_bfd (struct bfd_link_hash_entry *h) |
252b5132 RH |
1321 | { |
1322 | while (h->type == bfd_link_hash_warning) | |
1323 | h = h->u.i.link; | |
1324 | switch (h->type) | |
1325 | { | |
1326 | default: | |
1327 | return NULL; | |
1328 | case bfd_link_hash_undefined: | |
1329 | case bfd_link_hash_undefweak: | |
1330 | return h->u.undef.abfd; | |
1331 | case bfd_link_hash_defined: | |
1332 | case bfd_link_hash_defweak: | |
1333 | return h->u.def.section->owner; | |
1334 | case bfd_link_hash_common: | |
1335 | return h->u.c.p->section->owner; | |
1336 | } | |
1337 | /*NOTREACHED*/ | |
1338 | } | |
1339 | ||
1340 | /* Add a symbol to the global hash table. | |
1341 | ABFD is the BFD the symbol comes from. | |
1342 | NAME is the name of the symbol. | |
1343 | FLAGS is the BSF_* bits associated with the symbol. | |
1344 | SECTION is the section in which the symbol is defined; this may be | |
1345 | bfd_und_section_ptr or bfd_com_section_ptr. | |
1346 | VALUE is the value of the symbol, relative to the section. | |
1347 | STRING is used for either an indirect symbol, in which case it is | |
1348 | the name of the symbol to indirect to, or a warning symbol, in | |
1349 | which case it is the warning string. | |
b34976b6 | 1350 | COPY is TRUE if NAME or STRING must be copied into locally |
252b5132 | 1351 | allocated memory if they need to be saved. |
b34976b6 | 1352 | COLLECT is TRUE if we should automatically collect gcc constructor |
252b5132 RH |
1353 | or destructor names as collect2 does. |
1354 | HASHP, if not NULL, is a place to store the created hash table | |
1355 | entry; if *HASHP is not NULL, the caller has already looked up | |
509945ae | 1356 | the hash table entry, and stored it in *HASHP. */ |
252b5132 | 1357 | |
b34976b6 | 1358 | bfd_boolean |
c58b9523 AM |
1359 | _bfd_generic_link_add_one_symbol (struct bfd_link_info *info, |
1360 | bfd *abfd, | |
1361 | const char *name, | |
1362 | flagword flags, | |
1363 | asection *section, | |
1364 | bfd_vma value, | |
1365 | const char *string, | |
1366 | bfd_boolean copy, | |
1367 | bfd_boolean collect, | |
1368 | struct bfd_link_hash_entry **hashp) | |
252b5132 RH |
1369 | { |
1370 | enum link_row row; | |
1371 | struct bfd_link_hash_entry *h; | |
46135103 | 1372 | struct bfd_link_hash_entry *inh = NULL; |
b34976b6 | 1373 | bfd_boolean cycle; |
252b5132 | 1374 | |
894891db NC |
1375 | BFD_ASSERT (section != NULL); |
1376 | ||
252b5132 RH |
1377 | if (bfd_is_ind_section (section) |
1378 | || (flags & BSF_INDIRECT) != 0) | |
46135103 AM |
1379 | { |
1380 | row = INDR_ROW; | |
1381 | /* Create the indirect symbol here. This is for the benefit of | |
1382 | the plugin "notice" function. | |
1383 | STRING is the name of the symbol we want to indirect to. */ | |
1384 | inh = bfd_wrapped_link_hash_lookup (abfd, info, string, TRUE, | |
1385 | copy, FALSE); | |
1386 | if (inh == NULL) | |
1387 | return FALSE; | |
1388 | } | |
252b5132 RH |
1389 | else if ((flags & BSF_WARNING) != 0) |
1390 | row = WARN_ROW; | |
1391 | else if ((flags & BSF_CONSTRUCTOR) != 0) | |
1392 | row = SET_ROW; | |
1393 | else if (bfd_is_und_section (section)) | |
1394 | { | |
1395 | if ((flags & BSF_WEAK) != 0) | |
1396 | row = UNDEFW_ROW; | |
1397 | else | |
1398 | row = UNDEF_ROW; | |
1399 | } | |
1400 | else if ((flags & BSF_WEAK) != 0) | |
1401 | row = DEFW_ROW; | |
1402 | else if (bfd_is_com_section (section)) | |
b794fc1d AM |
1403 | { |
1404 | row = COMMON_ROW; | |
c5847ba7 | 1405 | if (!bfd_link_relocatable (info) |
e601d38b AM |
1406 | && name[0] == '_' |
1407 | && name[1] == '_' | |
1408 | && strcmp (name + (name[2] == '_'), "__gnu_lto_slim") == 0) | |
4eca0228 | 1409 | _bfd_error_handler |
dae82561 | 1410 | (_("%B: plugin needed to handle lto object"), abfd); |
b794fc1d | 1411 | } |
252b5132 RH |
1412 | else |
1413 | row = DEF_ROW; | |
1414 | ||
1415 | if (hashp != NULL && *hashp != NULL) | |
1416 | h = *hashp; | |
1417 | else | |
1418 | { | |
1419 | if (row == UNDEF_ROW || row == UNDEFW_ROW) | |
b34976b6 | 1420 | h = bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, copy, FALSE); |
252b5132 | 1421 | else |
b34976b6 | 1422 | h = bfd_link_hash_lookup (info->hash, name, TRUE, copy, FALSE); |
252b5132 RH |
1423 | if (h == NULL) |
1424 | { | |
1425 | if (hashp != NULL) | |
1426 | *hashp = NULL; | |
b34976b6 | 1427 | return FALSE; |
252b5132 RH |
1428 | } |
1429 | } | |
1430 | ||
1431 | if (info->notice_all | |
c58b9523 AM |
1432 | || (info->notice_hash != NULL |
1433 | && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)) | |
252b5132 | 1434 | { |
46135103 AM |
1435 | if (! (*info->callbacks->notice) (info, h, inh, |
1436 | abfd, section, value, flags)) | |
b34976b6 | 1437 | return FALSE; |
252b5132 RH |
1438 | } |
1439 | ||
c58b9523 | 1440 | if (hashp != NULL) |
252b5132 RH |
1441 | *hashp = h; |
1442 | ||
1443 | do | |
1444 | { | |
1445 | enum link_action action; | |
1446 | ||
b34976b6 | 1447 | cycle = FALSE; |
252b5132 RH |
1448 | action = link_action[(int) row][(int) h->type]; |
1449 | switch (action) | |
1450 | { | |
1451 | case FAIL: | |
1452 | abort (); | |
1453 | ||
1454 | case NOACT: | |
1455 | /* Do nothing. */ | |
1456 | break; | |
1457 | ||
1458 | case UND: | |
1459 | /* Make a new undefined symbol. */ | |
1460 | h->type = bfd_link_hash_undefined; | |
1461 | h->u.undef.abfd = abfd; | |
1462 | bfd_link_add_undef (info->hash, h); | |
1463 | break; | |
1464 | ||
1465 | case WEAK: | |
1466 | /* Make a new weak undefined symbol. */ | |
1467 | h->type = bfd_link_hash_undefweak; | |
1468 | h->u.undef.abfd = abfd; | |
1469 | break; | |
1470 | ||
1471 | case CDEF: | |
1472 | /* We have found a definition for a symbol which was | |
1473 | previously common. */ | |
1474 | BFD_ASSERT (h->type == bfd_link_hash_common); | |
1a72702b AM |
1475 | (*info->callbacks->multiple_common) (info, h, abfd, |
1476 | bfd_link_hash_defined, 0); | |
252b5132 RH |
1477 | /* Fall through. */ |
1478 | case DEF: | |
1479 | case DEFW: | |
1480 | { | |
1481 | enum bfd_link_hash_type oldtype; | |
1482 | ||
1483 | /* Define a symbol. */ | |
1484 | oldtype = h->type; | |
1485 | if (action == DEFW) | |
1486 | h->type = bfd_link_hash_defweak; | |
1487 | else | |
1488 | h->type = bfd_link_hash_defined; | |
1489 | h->u.def.section = section; | |
1490 | h->u.def.value = value; | |
12b2843a | 1491 | h->linker_def = 0; |
252b5132 RH |
1492 | |
1493 | /* If we have been asked to, we act like collect2 and | |
1494 | identify all functions that might be global | |
1495 | constructors and destructors and pass them up in a | |
1496 | callback. We only do this for certain object file | |
1497 | types, since many object file types can handle this | |
1498 | automatically. */ | |
1499 | if (collect && name[0] == '_') | |
1500 | { | |
1501 | const char *s; | |
1502 | ||
1503 | /* A constructor or destructor name starts like this: | |
1504 | _+GLOBAL_[_.$][ID][_.$] where the first [_.$] and | |
1505 | the second are the same character (we accept any | |
1506 | character there, in case a new object file format | |
1507 | comes along with even worse naming restrictions). */ | |
1508 | ||
1509 | #define CONS_PREFIX "GLOBAL_" | |
1510 | #define CONS_PREFIX_LEN (sizeof CONS_PREFIX - 1) | |
1511 | ||
1512 | s = name + 1; | |
1513 | while (*s == '_') | |
1514 | ++s; | |
0112cd26 | 1515 | if (s[0] == 'G' && CONST_STRNEQ (s, CONS_PREFIX)) |
252b5132 RH |
1516 | { |
1517 | char c; | |
1518 | ||
1519 | c = s[CONS_PREFIX_LEN + 1]; | |
1520 | if ((c == 'I' || c == 'D') | |
1521 | && s[CONS_PREFIX_LEN] == s[CONS_PREFIX_LEN + 2]) | |
1522 | { | |
1523 | /* If this is a definition of a symbol which | |
1524 | was previously weakly defined, we are in | |
1525 | trouble. We have already added a | |
1526 | constructor entry for the weak defined | |
1527 | symbol, and now we are trying to add one | |
1528 | for the new symbol. Fortunately, this case | |
1529 | should never arise in practice. */ | |
1530 | if (oldtype == bfd_link_hash_defweak) | |
1531 | abort (); | |
1532 | ||
1a72702b AM |
1533 | (*info->callbacks->constructor) (info, c == 'I', |
1534 | h->root.string, abfd, | |
1535 | section, value); | |
252b5132 RH |
1536 | } |
1537 | } | |
1538 | } | |
1539 | } | |
1540 | ||
1541 | break; | |
1542 | ||
1543 | case COM: | |
1544 | /* We have found a common definition for a symbol. */ | |
1545 | if (h->type == bfd_link_hash_new) | |
1546 | bfd_link_add_undef (info->hash, h); | |
1547 | h->type = bfd_link_hash_common; | |
a50b1753 | 1548 | h->u.c.p = (struct bfd_link_hash_common_entry *) |
c58b9523 AM |
1549 | bfd_hash_allocate (&info->hash->table, |
1550 | sizeof (struct bfd_link_hash_common_entry)); | |
252b5132 | 1551 | if (h->u.c.p == NULL) |
b34976b6 | 1552 | return FALSE; |
252b5132 RH |
1553 | |
1554 | h->u.c.size = value; | |
1555 | ||
1556 | /* Select a default alignment based on the size. This may | |
1557 | be overridden by the caller. */ | |
1558 | { | |
1559 | unsigned int power; | |
1560 | ||
1561 | power = bfd_log2 (value); | |
1562 | if (power > 4) | |
1563 | power = 4; | |
1564 | h->u.c.p->alignment_power = power; | |
1565 | } | |
1566 | ||
1567 | /* The section of a common symbol is only used if the common | |
1568 | symbol is actually allocated. It basically provides a | |
1569 | hook for the linker script to decide which output section | |
1570 | the common symbols should be put in. In most cases, the | |
1571 | section of a common symbol will be bfd_com_section_ptr, | |
1572 | the code here will choose a common symbol section named | |
1573 | "COMMON", and the linker script will contain *(COMMON) in | |
1574 | the appropriate place. A few targets use separate common | |
1575 | sections for small symbols, and they require special | |
1576 | handling. */ | |
1577 | if (section == bfd_com_section_ptr) | |
1578 | { | |
1579 | h->u.c.p->section = bfd_make_section_old_way (abfd, "COMMON"); | |
02d00247 | 1580 | h->u.c.p->section->flags |= SEC_ALLOC; |
252b5132 RH |
1581 | } |
1582 | else if (section->owner != abfd) | |
1583 | { | |
1584 | h->u.c.p->section = bfd_make_section_old_way (abfd, | |
1585 | section->name); | |
02d00247 | 1586 | h->u.c.p->section->flags |= SEC_ALLOC; |
252b5132 RH |
1587 | } |
1588 | else | |
1589 | h->u.c.p->section = section; | |
12b2843a | 1590 | h->linker_def = 0; |
252b5132 RH |
1591 | break; |
1592 | ||
1593 | case REF: | |
1594 | /* A reference to a defined symbol. */ | |
f6e332e6 AM |
1595 | if (h->u.undef.next == NULL && info->hash->undefs_tail != h) |
1596 | h->u.undef.next = h; | |
252b5132 RH |
1597 | break; |
1598 | ||
1599 | case BIG: | |
1600 | /* We have found a common definition for a symbol which | |
1601 | already had a common definition. Use the maximum of the | |
0a2afbc1 | 1602 | two sizes, and use the section required by the larger symbol. */ |
252b5132 | 1603 | BFD_ASSERT (h->type == bfd_link_hash_common); |
1a72702b AM |
1604 | (*info->callbacks->multiple_common) (info, h, abfd, |
1605 | bfd_link_hash_common, value); | |
252b5132 RH |
1606 | if (value > h->u.c.size) |
1607 | { | |
1608 | unsigned int power; | |
1609 | ||
1610 | h->u.c.size = value; | |
1611 | ||
1612 | /* Select a default alignment based on the size. This may | |
1613 | be overridden by the caller. */ | |
1614 | power = bfd_log2 (value); | |
1615 | if (power > 4) | |
1616 | power = 4; | |
1617 | h->u.c.p->alignment_power = power; | |
0a2afbc1 JW |
1618 | |
1619 | /* Some systems have special treatment for small commons, | |
1620 | hence we want to select the section used by the larger | |
1621 | symbol. This makes sure the symbol does not go in a | |
1622 | small common section if it is now too large. */ | |
1623 | if (section == bfd_com_section_ptr) | |
1624 | { | |
1625 | h->u.c.p->section | |
1626 | = bfd_make_section_old_way (abfd, "COMMON"); | |
02d00247 | 1627 | h->u.c.p->section->flags |= SEC_ALLOC; |
0a2afbc1 JW |
1628 | } |
1629 | else if (section->owner != abfd) | |
1630 | { | |
1631 | h->u.c.p->section | |
1632 | = bfd_make_section_old_way (abfd, section->name); | |
02d00247 | 1633 | h->u.c.p->section->flags |= SEC_ALLOC; |
0a2afbc1 JW |
1634 | } |
1635 | else | |
1636 | h->u.c.p->section = section; | |
252b5132 RH |
1637 | } |
1638 | break; | |
1639 | ||
1640 | case CREF: | |
24f58f47 AM |
1641 | /* We have found a common definition for a symbol which |
1642 | was already defined. */ | |
1a72702b AM |
1643 | (*info->callbacks->multiple_common) (info, h, abfd, |
1644 | bfd_link_hash_common, value); | |
252b5132 RH |
1645 | break; |
1646 | ||
1647 | case MIND: | |
1648 | /* Multiple indirect symbols. This is OK if they both point | |
1649 | to the same symbol. */ | |
1650 | if (strcmp (h->u.i.link->root.string, string) == 0) | |
1651 | break; | |
1652 | /* Fall through. */ | |
1653 | case MDEF: | |
1654 | /* Handle a multiple definition. */ | |
1a72702b AM |
1655 | (*info->callbacks->multiple_definition) (info, h, |
1656 | abfd, section, value); | |
252b5132 RH |
1657 | break; |
1658 | ||
1659 | case CIND: | |
1660 | /* Create an indirect symbol from an existing common symbol. */ | |
1661 | BFD_ASSERT (h->type == bfd_link_hash_common); | |
1a72702b AM |
1662 | (*info->callbacks->multiple_common) (info, h, abfd, |
1663 | bfd_link_hash_indirect, 0); | |
252b5132 RH |
1664 | /* Fall through. */ |
1665 | case IND: | |
46135103 AM |
1666 | if (inh->type == bfd_link_hash_indirect |
1667 | && inh->u.i.link == h) | |
1668 | { | |
4eca0228 | 1669 | _bfd_error_handler |
695344c0 | 1670 | /* xgettext:c-format */ |
46135103 AM |
1671 | (_("%B: indirect symbol `%s' to `%s' is a loop"), |
1672 | abfd, name, string); | |
1673 | bfd_set_error (bfd_error_invalid_operation); | |
b34976b6 | 1674 | return FALSE; |
46135103 AM |
1675 | } |
1676 | if (inh->type == bfd_link_hash_new) | |
1677 | { | |
1678 | inh->type = bfd_link_hash_undefined; | |
1679 | inh->u.undef.abfd = abfd; | |
1680 | bfd_link_add_undef (info->hash, inh); | |
1681 | } | |
252b5132 | 1682 | |
46135103 AM |
1683 | /* If the indirect symbol has been referenced, we need to |
1684 | push the reference down to the symbol we are referencing. */ | |
1685 | if (h->type != bfd_link_hash_new) | |
1686 | { | |
1687 | /* ??? If inh->type == bfd_link_hash_undefweak this | |
1688 | converts inh to bfd_link_hash_undefined. */ | |
1689 | row = UNDEF_ROW; | |
1690 | cycle = TRUE; | |
1691 | } | |
252b5132 | 1692 | |
46135103 AM |
1693 | h->type = bfd_link_hash_indirect; |
1694 | h->u.i.link = inh; | |
1695 | /* Not setting h = h->u.i.link here means that when cycle is | |
1696 | set above we'll always go to REFC, and then cycle again | |
1697 | to the indirected symbol. This means that any successful | |
1698 | change of an existing symbol to indirect counts as a | |
1699 | reference. ??? That may not be correct when the existing | |
1700 | symbol was defweak. */ | |
252b5132 RH |
1701 | break; |
1702 | ||
1703 | case SET: | |
1704 | /* Add an entry to a set. */ | |
1a72702b AM |
1705 | (*info->callbacks->add_to_set) (info, h, BFD_RELOC_CTOR, |
1706 | abfd, section, value); | |
252b5132 RH |
1707 | break; |
1708 | ||
1709 | case WARNC: | |
db712946 L |
1710 | /* Issue a warning and cycle, except when the reference is |
1711 | in LTO IR. */ | |
1712 | if (h->u.i.warning != NULL | |
1713 | && (abfd->flags & BFD_PLUGIN) == 0) | |
252b5132 | 1714 | { |
1a72702b AM |
1715 | (*info->callbacks->warning) (info, h->u.i.warning, |
1716 | h->root.string, abfd, NULL, 0); | |
252b5132 RH |
1717 | /* Only issue a warning once. */ |
1718 | h->u.i.warning = NULL; | |
1719 | } | |
1720 | /* Fall through. */ | |
1721 | case CYCLE: | |
1722 | /* Try again with the referenced symbol. */ | |
1723 | h = h->u.i.link; | |
b34976b6 | 1724 | cycle = TRUE; |
252b5132 RH |
1725 | break; |
1726 | ||
1727 | case REFC: | |
1728 | /* A reference to an indirect symbol. */ | |
f6e332e6 AM |
1729 | if (h->u.undef.next == NULL && info->hash->undefs_tail != h) |
1730 | h->u.undef.next = h; | |
252b5132 | 1731 | h = h->u.i.link; |
b34976b6 | 1732 | cycle = TRUE; |
252b5132 RH |
1733 | break; |
1734 | ||
1735 | case WARN: | |
db712946 L |
1736 | /* Warn if this symbol has been referenced already from non-IR, |
1737 | otherwise add a warning. */ | |
61f41c3c AM |
1738 | if ((!info->lto_plugin_active |
1739 | && (h->u.undef.next != NULL || info->hash->undefs_tail == h)) | |
bc4e12de | 1740 | || h->non_ir_ref_regular |
4070765b | 1741 | || h->non_ir_ref_dynamic) |
252b5132 | 1742 | { |
1a72702b AM |
1743 | (*info->callbacks->warning) (info, string, h->root.string, |
1744 | hash_entry_bfd (h), NULL, 0); | |
252b5132 RH |
1745 | break; |
1746 | } | |
1747 | /* Fall through. */ | |
1748 | case MWARN: | |
1749 | /* Make a warning symbol. */ | |
1750 | { | |
1751 | struct bfd_link_hash_entry *sub; | |
1752 | ||
1753 | /* STRING is the warning to give. */ | |
1754 | sub = ((struct bfd_link_hash_entry *) | |
1755 | ((*info->hash->table.newfunc) | |
c58b9523 | 1756 | (NULL, &info->hash->table, h->root.string))); |
252b5132 | 1757 | if (sub == NULL) |
b34976b6 | 1758 | return FALSE; |
252b5132 RH |
1759 | *sub = *h; |
1760 | sub->type = bfd_link_hash_warning; | |
1761 | sub->u.i.link = h; | |
1762 | if (! copy) | |
1763 | sub->u.i.warning = string; | |
1764 | else | |
1765 | { | |
1766 | char *w; | |
d4c88bbb | 1767 | size_t len = strlen (string) + 1; |
252b5132 | 1768 | |
a50b1753 | 1769 | w = (char *) bfd_hash_allocate (&info->hash->table, len); |
252b5132 | 1770 | if (w == NULL) |
b34976b6 | 1771 | return FALSE; |
d4c88bbb | 1772 | memcpy (w, string, len); |
252b5132 RH |
1773 | sub->u.i.warning = w; |
1774 | } | |
1775 | ||
1776 | bfd_hash_replace (&info->hash->table, | |
1777 | (struct bfd_hash_entry *) h, | |
1778 | (struct bfd_hash_entry *) sub); | |
1779 | if (hashp != NULL) | |
1780 | *hashp = sub; | |
1781 | } | |
1782 | break; | |
1783 | } | |
1784 | } | |
1785 | while (cycle); | |
1786 | ||
b34976b6 | 1787 | return TRUE; |
252b5132 RH |
1788 | } |
1789 | \f | |
1790 | /* Generic final link routine. */ | |
1791 | ||
b34976b6 | 1792 | bfd_boolean |
c58b9523 | 1793 | _bfd_generic_final_link (bfd *abfd, struct bfd_link_info *info) |
252b5132 RH |
1794 | { |
1795 | bfd *sub; | |
1796 | asection *o; | |
1797 | struct bfd_link_order *p; | |
1798 | size_t outsymalloc; | |
1799 | struct generic_write_global_symbol_info wginfo; | |
1800 | ||
c58b9523 | 1801 | bfd_get_outsymbols (abfd) = NULL; |
252b5132 RH |
1802 | bfd_get_symcount (abfd) = 0; |
1803 | outsymalloc = 0; | |
1804 | ||
1805 | /* Mark all sections which will be included in the output file. */ | |
1806 | for (o = abfd->sections; o != NULL; o = o->next) | |
8423293d | 1807 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
252b5132 | 1808 | if (p->type == bfd_indirect_link_order) |
b34976b6 | 1809 | p->u.indirect.section->linker_mark = TRUE; |
252b5132 RH |
1810 | |
1811 | /* Build the output symbol table. */ | |
c72f2fb2 | 1812 | for (sub = info->input_bfds; sub != NULL; sub = sub->link.next) |
252b5132 | 1813 | if (! _bfd_generic_link_output_symbols (abfd, sub, info, &outsymalloc)) |
b34976b6 | 1814 | return FALSE; |
252b5132 RH |
1815 | |
1816 | /* Accumulate the global symbols. */ | |
1817 | wginfo.info = info; | |
1818 | wginfo.output_bfd = abfd; | |
1819 | wginfo.psymalloc = &outsymalloc; | |
1820 | _bfd_generic_link_hash_traverse (_bfd_generic_hash_table (info), | |
1821 | _bfd_generic_link_write_global_symbol, | |
c58b9523 | 1822 | &wginfo); |
252b5132 RH |
1823 | |
1824 | /* Make sure we have a trailing NULL pointer on OUTSYMBOLS. We | |
1825 | shouldn't really need one, since we have SYMCOUNT, but some old | |
1826 | code still expects one. */ | |
1827 | if (! generic_add_output_symbol (abfd, &outsymalloc, NULL)) | |
b34976b6 | 1828 | return FALSE; |
252b5132 | 1829 | |
0e1862bb | 1830 | if (bfd_link_relocatable (info)) |
252b5132 RH |
1831 | { |
1832 | /* Allocate space for the output relocs for each section. */ | |
c58b9523 | 1833 | for (o = abfd->sections; o != NULL; o = o->next) |
252b5132 RH |
1834 | { |
1835 | o->reloc_count = 0; | |
8423293d | 1836 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
252b5132 RH |
1837 | { |
1838 | if (p->type == bfd_section_reloc_link_order | |
1839 | || p->type == bfd_symbol_reloc_link_order) | |
1840 | ++o->reloc_count; | |
1841 | else if (p->type == bfd_indirect_link_order) | |
1842 | { | |
1843 | asection *input_section; | |
1844 | bfd *input_bfd; | |
1845 | long relsize; | |
1846 | arelent **relocs; | |
1847 | asymbol **symbols; | |
1848 | long reloc_count; | |
1849 | ||
1850 | input_section = p->u.indirect.section; | |
1851 | input_bfd = input_section->owner; | |
1852 | relsize = bfd_get_reloc_upper_bound (input_bfd, | |
1853 | input_section); | |
1854 | if (relsize < 0) | |
b34976b6 | 1855 | return FALSE; |
a50b1753 | 1856 | relocs = (arelent **) bfd_malloc (relsize); |
252b5132 | 1857 | if (!relocs && relsize != 0) |
b34976b6 | 1858 | return FALSE; |
252b5132 RH |
1859 | symbols = _bfd_generic_link_get_symbols (input_bfd); |
1860 | reloc_count = bfd_canonicalize_reloc (input_bfd, | |
1861 | input_section, | |
1862 | relocs, | |
1863 | symbols); | |
5ed6aba4 | 1864 | free (relocs); |
252b5132 | 1865 | if (reloc_count < 0) |
b34976b6 | 1866 | return FALSE; |
252b5132 RH |
1867 | BFD_ASSERT ((unsigned long) reloc_count |
1868 | == input_section->reloc_count); | |
1869 | o->reloc_count += reloc_count; | |
252b5132 RH |
1870 | } |
1871 | } | |
1872 | if (o->reloc_count > 0) | |
1873 | { | |
dc810e39 AM |
1874 | bfd_size_type amt; |
1875 | ||
1876 | amt = o->reloc_count; | |
1877 | amt *= sizeof (arelent *); | |
a50b1753 | 1878 | o->orelocation = (struct reloc_cache_entry **) bfd_alloc (abfd, amt); |
252b5132 | 1879 | if (!o->orelocation) |
b34976b6 | 1880 | return FALSE; |
252b5132 RH |
1881 | o->flags |= SEC_RELOC; |
1882 | /* Reset the count so that it can be used as an index | |
1883 | when putting in the output relocs. */ | |
1884 | o->reloc_count = 0; | |
1885 | } | |
1886 | } | |
1887 | } | |
1888 | ||
1889 | /* Handle all the link order information for the sections. */ | |
c58b9523 | 1890 | for (o = abfd->sections; o != NULL; o = o->next) |
252b5132 | 1891 | { |
8423293d | 1892 | for (p = o->map_head.link_order; p != NULL; p = p->next) |
252b5132 RH |
1893 | { |
1894 | switch (p->type) | |
1895 | { | |
1896 | case bfd_section_reloc_link_order: | |
1897 | case bfd_symbol_reloc_link_order: | |
1898 | if (! _bfd_generic_reloc_link_order (abfd, info, o, p)) | |
b34976b6 | 1899 | return FALSE; |
252b5132 RH |
1900 | break; |
1901 | case bfd_indirect_link_order: | |
b34976b6 AM |
1902 | if (! default_indirect_link_order (abfd, info, o, p, TRUE)) |
1903 | return FALSE; | |
252b5132 RH |
1904 | break; |
1905 | default: | |
1906 | if (! _bfd_default_link_order (abfd, info, o, p)) | |
b34976b6 | 1907 | return FALSE; |
252b5132 RH |
1908 | break; |
1909 | } | |
1910 | } | |
1911 | } | |
509945ae | 1912 | |
b34976b6 | 1913 | return TRUE; |
252b5132 RH |
1914 | } |
1915 | ||
1916 | /* Add an output symbol to the output BFD. */ | |
1917 | ||
b34976b6 | 1918 | static bfd_boolean |
c58b9523 | 1919 | generic_add_output_symbol (bfd *output_bfd, size_t *psymalloc, asymbol *sym) |
252b5132 RH |
1920 | { |
1921 | if (bfd_get_symcount (output_bfd) >= *psymalloc) | |
1922 | { | |
1923 | asymbol **newsyms; | |
dc810e39 | 1924 | bfd_size_type amt; |
252b5132 RH |
1925 | |
1926 | if (*psymalloc == 0) | |
1927 | *psymalloc = 124; | |
1928 | else | |
1929 | *psymalloc *= 2; | |
dc810e39 AM |
1930 | amt = *psymalloc; |
1931 | amt *= sizeof (asymbol *); | |
a50b1753 | 1932 | newsyms = (asymbol **) bfd_realloc (bfd_get_outsymbols (output_bfd), amt); |
c58b9523 | 1933 | if (newsyms == NULL) |
b34976b6 | 1934 | return FALSE; |
252b5132 RH |
1935 | bfd_get_outsymbols (output_bfd) = newsyms; |
1936 | } | |
1937 | ||
1938 | bfd_get_outsymbols (output_bfd) [bfd_get_symcount (output_bfd)] = sym; | |
1939 | if (sym != NULL) | |
1940 | ++ bfd_get_symcount (output_bfd); | |
1941 | ||
b34976b6 | 1942 | return TRUE; |
252b5132 RH |
1943 | } |
1944 | ||
1945 | /* Handle the symbols for an input BFD. */ | |
1946 | ||
b34976b6 | 1947 | bfd_boolean |
c58b9523 AM |
1948 | _bfd_generic_link_output_symbols (bfd *output_bfd, |
1949 | bfd *input_bfd, | |
1950 | struct bfd_link_info *info, | |
1951 | size_t *psymalloc) | |
252b5132 RH |
1952 | { |
1953 | asymbol **sym_ptr; | |
1954 | asymbol **sym_end; | |
1955 | ||
5c1d2f5f | 1956 | if (!bfd_generic_link_read_symbols (input_bfd)) |
b34976b6 | 1957 | return FALSE; |
252b5132 RH |
1958 | |
1959 | /* Create a filename symbol if we are supposed to. */ | |
c58b9523 | 1960 | if (info->create_object_symbols_section != NULL) |
252b5132 RH |
1961 | { |
1962 | asection *sec; | |
1963 | ||
c58b9523 | 1964 | for (sec = input_bfd->sections; sec != NULL; sec = sec->next) |
252b5132 RH |
1965 | { |
1966 | if (sec->output_section == info->create_object_symbols_section) | |
1967 | { | |
1968 | asymbol *newsym; | |
1969 | ||
1970 | newsym = bfd_make_empty_symbol (input_bfd); | |
1971 | if (!newsym) | |
b34976b6 | 1972 | return FALSE; |
252b5132 RH |
1973 | newsym->name = input_bfd->filename; |
1974 | newsym->value = 0; | |
1975 | newsym->flags = BSF_LOCAL | BSF_FILE; | |
1976 | newsym->section = sec; | |
1977 | ||
1978 | if (! generic_add_output_symbol (output_bfd, psymalloc, | |
1979 | newsym)) | |
b34976b6 | 1980 | return FALSE; |
252b5132 RH |
1981 | |
1982 | break; | |
1983 | } | |
1984 | } | |
1985 | } | |
1986 | ||
1987 | /* Adjust the values of the globally visible symbols, and write out | |
1988 | local symbols. */ | |
1989 | sym_ptr = _bfd_generic_link_get_symbols (input_bfd); | |
1990 | sym_end = sym_ptr + _bfd_generic_link_get_symcount (input_bfd); | |
1991 | for (; sym_ptr < sym_end; sym_ptr++) | |
1992 | { | |
1993 | asymbol *sym; | |
1994 | struct generic_link_hash_entry *h; | |
b34976b6 | 1995 | bfd_boolean output; |
252b5132 | 1996 | |
c58b9523 | 1997 | h = NULL; |
252b5132 RH |
1998 | sym = *sym_ptr; |
1999 | if ((sym->flags & (BSF_INDIRECT | |
2000 | | BSF_WARNING | |
2001 | | BSF_GLOBAL | |
2002 | | BSF_CONSTRUCTOR | |
2003 | | BSF_WEAK)) != 0 | |
2004 | || bfd_is_und_section (bfd_get_section (sym)) | |
2005 | || bfd_is_com_section (bfd_get_section (sym)) | |
2006 | || bfd_is_ind_section (bfd_get_section (sym))) | |
2007 | { | |
2008 | if (sym->udata.p != NULL) | |
a50b1753 | 2009 | h = (struct generic_link_hash_entry *) sym->udata.p; |
252b5132 RH |
2010 | else if ((sym->flags & BSF_CONSTRUCTOR) != 0) |
2011 | { | |
2012 | /* This case normally means that the main linker code | |
2013 | deliberately ignored this constructor symbol. We | |
2014 | should just pass it through. This will screw up if | |
2015 | the constructor symbol is from a different, | |
2016 | non-generic, object file format, but the case will | |
2017 | only arise when linking with -r, which will probably | |
2018 | fail anyhow, since there will be no way to represent | |
2019 | the relocs in the output format being used. */ | |
2020 | h = NULL; | |
2021 | } | |
2022 | else if (bfd_is_und_section (bfd_get_section (sym))) | |
2023 | h = ((struct generic_link_hash_entry *) | |
2024 | bfd_wrapped_link_hash_lookup (output_bfd, info, | |
2025 | bfd_asymbol_name (sym), | |
b34976b6 | 2026 | FALSE, FALSE, TRUE)); |
252b5132 RH |
2027 | else |
2028 | h = _bfd_generic_link_hash_lookup (_bfd_generic_hash_table (info), | |
2029 | bfd_asymbol_name (sym), | |
b34976b6 | 2030 | FALSE, FALSE, TRUE); |
252b5132 | 2031 | |
c58b9523 | 2032 | if (h != NULL) |
252b5132 RH |
2033 | { |
2034 | /* Force all references to this symbol to point to | |
2035 | the same area in memory. It is possible that | |
2036 | this routine will be called with a hash table | |
2037 | other than a generic hash table, so we double | |
2038 | check that. */ | |
f13a99db | 2039 | if (info->output_bfd->xvec == input_bfd->xvec) |
252b5132 | 2040 | { |
c58b9523 | 2041 | if (h->sym != NULL) |
252b5132 RH |
2042 | *sym_ptr = sym = h->sym; |
2043 | } | |
2044 | ||
2045 | switch (h->root.type) | |
2046 | { | |
2047 | default: | |
2048 | case bfd_link_hash_new: | |
2049 | abort (); | |
2050 | case bfd_link_hash_undefined: | |
2051 | break; | |
2052 | case bfd_link_hash_undefweak: | |
2053 | sym->flags |= BSF_WEAK; | |
2054 | break; | |
2055 | case bfd_link_hash_indirect: | |
2056 | h = (struct generic_link_hash_entry *) h->root.u.i.link; | |
2057 | /* fall through */ | |
2058 | case bfd_link_hash_defined: | |
2059 | sym->flags |= BSF_GLOBAL; | |
d5111a0e | 2060 | sym->flags &=~ (BSF_WEAK | BSF_CONSTRUCTOR); |
252b5132 RH |
2061 | sym->value = h->root.u.def.value; |
2062 | sym->section = h->root.u.def.section; | |
2063 | break; | |
2064 | case bfd_link_hash_defweak: | |
2065 | sym->flags |= BSF_WEAK; | |
2066 | sym->flags &=~ BSF_CONSTRUCTOR; | |
2067 | sym->value = h->root.u.def.value; | |
2068 | sym->section = h->root.u.def.section; | |
2069 | break; | |
2070 | case bfd_link_hash_common: | |
2071 | sym->value = h->root.u.c.size; | |
2072 | sym->flags |= BSF_GLOBAL; | |
2073 | if (! bfd_is_com_section (sym->section)) | |
2074 | { | |
2075 | BFD_ASSERT (bfd_is_und_section (sym->section)); | |
2076 | sym->section = bfd_com_section_ptr; | |
2077 | } | |
2078 | /* We do not set the section of the symbol to | |
2079 | h->root.u.c.p->section. That value was saved so | |
2080 | that we would know where to allocate the symbol | |
2081 | if it was defined. In this case the type is | |
2082 | still bfd_link_hash_common, so we did not define | |
2083 | it, so we do not want to use that section. */ | |
2084 | break; | |
2085 | } | |
2086 | } | |
2087 | } | |
2088 | ||
2089 | /* This switch is straight from the old code in | |
2090 | write_file_locals in ldsym.c. */ | |
2091 | if (info->strip == strip_all | |
2092 | || (info->strip == strip_some | |
c58b9523 AM |
2093 | && bfd_hash_lookup (info->keep_hash, bfd_asymbol_name (sym), |
2094 | FALSE, FALSE) == NULL)) | |
b34976b6 | 2095 | output = FALSE; |
af54f0eb | 2096 | else if ((sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) != 0) |
252b5132 RH |
2097 | { |
2098 | /* If this symbol is marked as occurring now, rather | |
2099 | than at the end, output it now. This is used for | |
2100 | COFF C_EXT FCN symbols. FIXME: There must be a | |
2101 | better way. */ | |
2102 | if (bfd_asymbol_bfd (sym) == input_bfd | |
2103 | && (sym->flags & BSF_NOT_AT_END) != 0) | |
b34976b6 | 2104 | output = TRUE; |
252b5132 | 2105 | else |
b34976b6 | 2106 | output = FALSE; |
252b5132 RH |
2107 | } |
2108 | else if (bfd_is_ind_section (sym->section)) | |
b34976b6 | 2109 | output = FALSE; |
252b5132 RH |
2110 | else if ((sym->flags & BSF_DEBUGGING) != 0) |
2111 | { | |
2112 | if (info->strip == strip_none) | |
b34976b6 | 2113 | output = TRUE; |
252b5132 | 2114 | else |
b34976b6 | 2115 | output = FALSE; |
252b5132 RH |
2116 | } |
2117 | else if (bfd_is_und_section (sym->section) | |
2118 | || bfd_is_com_section (sym->section)) | |
b34976b6 | 2119 | output = FALSE; |
252b5132 RH |
2120 | else if ((sym->flags & BSF_LOCAL) != 0) |
2121 | { | |
2122 | if ((sym->flags & BSF_WARNING) != 0) | |
b34976b6 | 2123 | output = FALSE; |
252b5132 RH |
2124 | else |
2125 | { | |
2126 | switch (info->discard) | |
2127 | { | |
2128 | default: | |
2129 | case discard_all: | |
b34976b6 | 2130 | output = FALSE; |
252b5132 | 2131 | break; |
f5fa8ca2 | 2132 | case discard_sec_merge: |
b34976b6 | 2133 | output = TRUE; |
0e1862bb | 2134 | if (bfd_link_relocatable (info) |
f5fa8ca2 JJ |
2135 | || ! (sym->section->flags & SEC_MERGE)) |
2136 | break; | |
2137 | /* FALLTHROUGH */ | |
252b5132 RH |
2138 | case discard_l: |
2139 | if (bfd_is_local_label (input_bfd, sym)) | |
b34976b6 | 2140 | output = FALSE; |
252b5132 | 2141 | else |
b34976b6 | 2142 | output = TRUE; |
252b5132 RH |
2143 | break; |
2144 | case discard_none: | |
b34976b6 | 2145 | output = TRUE; |
252b5132 RH |
2146 | break; |
2147 | } | |
2148 | } | |
2149 | } | |
2150 | else if ((sym->flags & BSF_CONSTRUCTOR)) | |
2151 | { | |
2152 | if (info->strip != strip_all) | |
b34976b6 | 2153 | output = TRUE; |
252b5132 | 2154 | else |
b34976b6 | 2155 | output = FALSE; |
252b5132 | 2156 | } |
d3a65d4d HPN |
2157 | else if (sym->flags == 0 |
2158 | && (sym->section->owner->flags & BFD_PLUGIN) != 0) | |
2159 | /* LTO doesn't set symbol information. We get here with the | |
2160 | generic linker for a symbol that was "common" but no longer | |
2161 | needs to be global. */ | |
2162 | output = FALSE; | |
252b5132 RH |
2163 | else |
2164 | abort (); | |
2165 | ||
2166 | /* If this symbol is in a section which is not being included | |
ab82c5b9 | 2167 | in the output file, then we don't want to output the |
f02571c5 AM |
2168 | symbol. */ |
2169 | if (!bfd_is_abs_section (sym->section) | |
2170 | && bfd_section_removed_from_list (output_bfd, | |
ab82c5b9 | 2171 | sym->section->output_section)) |
b34976b6 | 2172 | output = FALSE; |
252b5132 RH |
2173 | |
2174 | if (output) | |
2175 | { | |
2176 | if (! generic_add_output_symbol (output_bfd, psymalloc, sym)) | |
b34976b6 | 2177 | return FALSE; |
c58b9523 | 2178 | if (h != NULL) |
b34976b6 | 2179 | h->written = TRUE; |
252b5132 RH |
2180 | } |
2181 | } | |
2182 | ||
b34976b6 | 2183 | return TRUE; |
252b5132 RH |
2184 | } |
2185 | ||
2186 | /* Set the section and value of a generic BFD symbol based on a linker | |
2187 | hash table entry. */ | |
2188 | ||
2189 | static void | |
c58b9523 | 2190 | set_symbol_from_hash (asymbol *sym, struct bfd_link_hash_entry *h) |
252b5132 RH |
2191 | { |
2192 | switch (h->type) | |
2193 | { | |
2194 | default: | |
2195 | abort (); | |
2196 | break; | |
2197 | case bfd_link_hash_new: | |
2198 | /* This can happen when a constructor symbol is seen but we are | |
2199 | not building constructors. */ | |
2200 | if (sym->section != NULL) | |
2201 | { | |
2202 | BFD_ASSERT ((sym->flags & BSF_CONSTRUCTOR) != 0); | |
2203 | } | |
2204 | else | |
2205 | { | |
2206 | sym->flags |= BSF_CONSTRUCTOR; | |
2207 | sym->section = bfd_abs_section_ptr; | |
2208 | sym->value = 0; | |
2209 | } | |
2210 | break; | |
2211 | case bfd_link_hash_undefined: | |
2212 | sym->section = bfd_und_section_ptr; | |
2213 | sym->value = 0; | |
2214 | break; | |
2215 | case bfd_link_hash_undefweak: | |
2216 | sym->section = bfd_und_section_ptr; | |
2217 | sym->value = 0; | |
2218 | sym->flags |= BSF_WEAK; | |
2219 | break; | |
2220 | case bfd_link_hash_defined: | |
2221 | sym->section = h->u.def.section; | |
2222 | sym->value = h->u.def.value; | |
2223 | break; | |
2224 | case bfd_link_hash_defweak: | |
2225 | sym->flags |= BSF_WEAK; | |
2226 | sym->section = h->u.def.section; | |
2227 | sym->value = h->u.def.value; | |
2228 | break; | |
2229 | case bfd_link_hash_common: | |
2230 | sym->value = h->u.c.size; | |
2231 | if (sym->section == NULL) | |
2232 | sym->section = bfd_com_section_ptr; | |
2233 | else if (! bfd_is_com_section (sym->section)) | |
2234 | { | |
2235 | BFD_ASSERT (bfd_is_und_section (sym->section)); | |
2236 | sym->section = bfd_com_section_ptr; | |
2237 | } | |
2238 | /* Do not set the section; see _bfd_generic_link_output_symbols. */ | |
2239 | break; | |
2240 | case bfd_link_hash_indirect: | |
2241 | case bfd_link_hash_warning: | |
2242 | /* FIXME: What should we do here? */ | |
2243 | break; | |
2244 | } | |
2245 | } | |
2246 | ||
2247 | /* Write out a global symbol, if it hasn't already been written out. | |
2248 | This is called for each symbol in the hash table. */ | |
2249 | ||
b34976b6 | 2250 | bfd_boolean |
c58b9523 AM |
2251 | _bfd_generic_link_write_global_symbol (struct generic_link_hash_entry *h, |
2252 | void *data) | |
252b5132 | 2253 | { |
a50b1753 NC |
2254 | struct generic_write_global_symbol_info *wginfo = |
2255 | (struct generic_write_global_symbol_info *) data; | |
252b5132 RH |
2256 | asymbol *sym; |
2257 | ||
2258 | if (h->written) | |
b34976b6 | 2259 | return TRUE; |
252b5132 | 2260 | |
b34976b6 | 2261 | h->written = TRUE; |
252b5132 RH |
2262 | |
2263 | if (wginfo->info->strip == strip_all | |
2264 | || (wginfo->info->strip == strip_some | |
2265 | && bfd_hash_lookup (wginfo->info->keep_hash, h->root.root.string, | |
b34976b6 AM |
2266 | FALSE, FALSE) == NULL)) |
2267 | return TRUE; | |
252b5132 | 2268 | |
c58b9523 | 2269 | if (h->sym != NULL) |
252b5132 RH |
2270 | sym = h->sym; |
2271 | else | |
2272 | { | |
2273 | sym = bfd_make_empty_symbol (wginfo->output_bfd); | |
2274 | if (!sym) | |
b34976b6 | 2275 | return FALSE; |
252b5132 RH |
2276 | sym->name = h->root.root.string; |
2277 | sym->flags = 0; | |
2278 | } | |
2279 | ||
2280 | set_symbol_from_hash (sym, &h->root); | |
2281 | ||
2282 | sym->flags |= BSF_GLOBAL; | |
2283 | ||
2284 | if (! generic_add_output_symbol (wginfo->output_bfd, wginfo->psymalloc, | |
2285 | sym)) | |
2286 | { | |
2287 | /* FIXME: No way to return failure. */ | |
2288 | abort (); | |
2289 | } | |
2290 | ||
b34976b6 | 2291 | return TRUE; |
252b5132 RH |
2292 | } |
2293 | ||
2294 | /* Create a relocation. */ | |
2295 | ||
b34976b6 | 2296 | bfd_boolean |
c58b9523 AM |
2297 | _bfd_generic_reloc_link_order (bfd *abfd, |
2298 | struct bfd_link_info *info, | |
2299 | asection *sec, | |
2300 | struct bfd_link_order *link_order) | |
252b5132 RH |
2301 | { |
2302 | arelent *r; | |
2303 | ||
0e1862bb | 2304 | if (! bfd_link_relocatable (info)) |
252b5132 | 2305 | abort (); |
c58b9523 | 2306 | if (sec->orelocation == NULL) |
252b5132 RH |
2307 | abort (); |
2308 | ||
a50b1753 | 2309 | r = (arelent *) bfd_alloc (abfd, sizeof (arelent)); |
c58b9523 | 2310 | if (r == NULL) |
b34976b6 | 2311 | return FALSE; |
509945ae | 2312 | |
252b5132 RH |
2313 | r->address = link_order->offset; |
2314 | r->howto = bfd_reloc_type_lookup (abfd, link_order->u.reloc.p->reloc); | |
2315 | if (r->howto == 0) | |
2316 | { | |
2317 | bfd_set_error (bfd_error_bad_value); | |
b34976b6 | 2318 | return FALSE; |
252b5132 RH |
2319 | } |
2320 | ||
2321 | /* Get the symbol to use for the relocation. */ | |
2322 | if (link_order->type == bfd_section_reloc_link_order) | |
2323 | r->sym_ptr_ptr = link_order->u.reloc.p->u.section->symbol_ptr_ptr; | |
2324 | else | |
2325 | { | |
2326 | struct generic_link_hash_entry *h; | |
2327 | ||
2328 | h = ((struct generic_link_hash_entry *) | |
2329 | bfd_wrapped_link_hash_lookup (abfd, info, | |
2330 | link_order->u.reloc.p->u.name, | |
b34976b6 | 2331 | FALSE, FALSE, TRUE)); |
c58b9523 | 2332 | if (h == NULL |
252b5132 RH |
2333 | || ! h->written) |
2334 | { | |
1a72702b AM |
2335 | (*info->callbacks->unattached_reloc) |
2336 | (info, link_order->u.reloc.p->u.name, NULL, NULL, 0); | |
252b5132 | 2337 | bfd_set_error (bfd_error_bad_value); |
b34976b6 | 2338 | return FALSE; |
252b5132 RH |
2339 | } |
2340 | r->sym_ptr_ptr = &h->sym; | |
2341 | } | |
2342 | ||
2343 | /* If this is an inplace reloc, write the addend to the object file. | |
2344 | Otherwise, store it in the reloc addend. */ | |
2345 | if (! r->howto->partial_inplace) | |
2346 | r->addend = link_order->u.reloc.p->addend; | |
2347 | else | |
2348 | { | |
2349 | bfd_size_type size; | |
2350 | bfd_reloc_status_type rstat; | |
2351 | bfd_byte *buf; | |
b34976b6 | 2352 | bfd_boolean ok; |
dc810e39 | 2353 | file_ptr loc; |
252b5132 RH |
2354 | |
2355 | size = bfd_get_reloc_size (r->howto); | |
a50b1753 | 2356 | buf = (bfd_byte *) bfd_zmalloc (size); |
6346d5ca | 2357 | if (buf == NULL && size != 0) |
b34976b6 | 2358 | return FALSE; |
252b5132 | 2359 | rstat = _bfd_relocate_contents (r->howto, abfd, |
dc810e39 AM |
2360 | (bfd_vma) link_order->u.reloc.p->addend, |
2361 | buf); | |
252b5132 RH |
2362 | switch (rstat) |
2363 | { | |
2364 | case bfd_reloc_ok: | |
2365 | break; | |
2366 | default: | |
2367 | case bfd_reloc_outofrange: | |
2368 | abort (); | |
2369 | case bfd_reloc_overflow: | |
1a72702b AM |
2370 | (*info->callbacks->reloc_overflow) |
2371 | (info, NULL, | |
2372 | (link_order->type == bfd_section_reloc_link_order | |
2373 | ? bfd_section_name (abfd, link_order->u.reloc.p->u.section) | |
2374 | : link_order->u.reloc.p->u.name), | |
2375 | r->howto->name, link_order->u.reloc.p->addend, | |
2376 | NULL, NULL, 0); | |
252b5132 RH |
2377 | break; |
2378 | } | |
dc810e39 | 2379 | loc = link_order->offset * bfd_octets_per_byte (abfd); |
c58b9523 | 2380 | ok = bfd_set_section_contents (abfd, sec, buf, loc, size); |
252b5132 RH |
2381 | free (buf); |
2382 | if (! ok) | |
b34976b6 | 2383 | return FALSE; |
252b5132 RH |
2384 | |
2385 | r->addend = 0; | |
2386 | } | |
2387 | ||
2388 | sec->orelocation[sec->reloc_count] = r; | |
2389 | ++sec->reloc_count; | |
2390 | ||
b34976b6 | 2391 | return TRUE; |
252b5132 RH |
2392 | } |
2393 | \f | |
2394 | /* Allocate a new link_order for a section. */ | |
2395 | ||
2396 | struct bfd_link_order * | |
c58b9523 | 2397 | bfd_new_link_order (bfd *abfd, asection *section) |
252b5132 | 2398 | { |
dc810e39 | 2399 | bfd_size_type amt = sizeof (struct bfd_link_order); |
d3ce72d0 | 2400 | struct bfd_link_order *new_lo; |
fd96f80f | 2401 | |
d3ce72d0 NC |
2402 | new_lo = (struct bfd_link_order *) bfd_zalloc (abfd, amt); |
2403 | if (!new_lo) | |
252b5132 RH |
2404 | return NULL; |
2405 | ||
d3ce72d0 | 2406 | new_lo->type = bfd_undefined_link_order; |
252b5132 | 2407 | |
8423293d | 2408 | if (section->map_tail.link_order != NULL) |
d3ce72d0 | 2409 | section->map_tail.link_order->next = new_lo; |
252b5132 | 2410 | else |
d3ce72d0 NC |
2411 | section->map_head.link_order = new_lo; |
2412 | section->map_tail.link_order = new_lo; | |
252b5132 | 2413 | |
d3ce72d0 | 2414 | return new_lo; |
252b5132 RH |
2415 | } |
2416 | ||
2417 | /* Default link order processing routine. Note that we can not handle | |
2418 | the reloc_link_order types here, since they depend upon the details | |
2419 | of how the particular backends generates relocs. */ | |
2420 | ||
b34976b6 | 2421 | bfd_boolean |
c58b9523 AM |
2422 | _bfd_default_link_order (bfd *abfd, |
2423 | struct bfd_link_info *info, | |
2424 | asection *sec, | |
2425 | struct bfd_link_order *link_order) | |
252b5132 RH |
2426 | { |
2427 | switch (link_order->type) | |
2428 | { | |
2429 | case bfd_undefined_link_order: | |
2430 | case bfd_section_reloc_link_order: | |
2431 | case bfd_symbol_reloc_link_order: | |
2432 | default: | |
2433 | abort (); | |
2434 | case bfd_indirect_link_order: | |
2435 | return default_indirect_link_order (abfd, info, sec, link_order, | |
b34976b6 | 2436 | FALSE); |
252b5132 | 2437 | case bfd_data_link_order: |
fd96f80f | 2438 | return default_data_link_order (abfd, info, sec, link_order); |
252b5132 RH |
2439 | } |
2440 | } | |
2441 | ||
fd96f80f | 2442 | /* Default routine to handle a bfd_data_link_order. */ |
252b5132 | 2443 | |
b34976b6 | 2444 | static bfd_boolean |
c58b9523 AM |
2445 | default_data_link_order (bfd *abfd, |
2446 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
2447 | asection *sec, | |
2448 | struct bfd_link_order *link_order) | |
252b5132 | 2449 | { |
dc810e39 | 2450 | bfd_size_type size; |
fd96f80f AM |
2451 | size_t fill_size; |
2452 | bfd_byte *fill; | |
0ac450b6 | 2453 | file_ptr loc; |
b34976b6 | 2454 | bfd_boolean result; |
252b5132 RH |
2455 | |
2456 | BFD_ASSERT ((sec->flags & SEC_HAS_CONTENTS) != 0); | |
2457 | ||
dc810e39 | 2458 | size = link_order->size; |
0ac450b6 | 2459 | if (size == 0) |
b34976b6 | 2460 | return TRUE; |
0ac450b6 | 2461 | |
fd96f80f AM |
2462 | fill = link_order->u.data.contents; |
2463 | fill_size = link_order->u.data.size; | |
b7761f11 L |
2464 | if (fill_size == 0) |
2465 | { | |
2466 | fill = abfd->arch_info->fill (size, bfd_big_endian (abfd), | |
2467 | (sec->flags & SEC_CODE) != 0); | |
2468 | if (fill == NULL) | |
2469 | return FALSE; | |
2470 | } | |
2471 | else if (fill_size < size) | |
fd96f80f AM |
2472 | { |
2473 | bfd_byte *p; | |
a50b1753 | 2474 | fill = (bfd_byte *) bfd_malloc (size); |
fd96f80f | 2475 | if (fill == NULL) |
b34976b6 | 2476 | return FALSE; |
fd96f80f AM |
2477 | p = fill; |
2478 | if (fill_size == 1) | |
2479 | memset (p, (int) link_order->u.data.contents[0], (size_t) size); | |
2480 | else | |
2481 | { | |
2482 | do | |
2483 | { | |
2484 | memcpy (p, link_order->u.data.contents, fill_size); | |
2485 | p += fill_size; | |
2486 | size -= fill_size; | |
2487 | } | |
2488 | while (size >= fill_size); | |
2489 | if (size != 0) | |
2490 | memcpy (p, link_order->u.data.contents, (size_t) size); | |
2491 | size = link_order->size; | |
2492 | } | |
2493 | } | |
0ac450b6 | 2494 | |
dc810e39 | 2495 | loc = link_order->offset * bfd_octets_per_byte (abfd); |
fd96f80f | 2496 | result = bfd_set_section_contents (abfd, sec, fill, loc, size); |
0ac450b6 | 2497 | |
fd96f80f AM |
2498 | if (fill != link_order->u.data.contents) |
2499 | free (fill); | |
252b5132 RH |
2500 | return result; |
2501 | } | |
2502 | ||
2503 | /* Default routine to handle a bfd_indirect_link_order. */ | |
2504 | ||
b34976b6 | 2505 | static bfd_boolean |
c58b9523 AM |
2506 | default_indirect_link_order (bfd *output_bfd, |
2507 | struct bfd_link_info *info, | |
2508 | asection *output_section, | |
2509 | struct bfd_link_order *link_order, | |
2510 | bfd_boolean generic_linker) | |
252b5132 RH |
2511 | { |
2512 | asection *input_section; | |
2513 | bfd *input_bfd; | |
2514 | bfd_byte *contents = NULL; | |
2515 | bfd_byte *new_contents; | |
dc810e39 AM |
2516 | bfd_size_type sec_size; |
2517 | file_ptr loc; | |
252b5132 RH |
2518 | |
2519 | BFD_ASSERT ((output_section->flags & SEC_HAS_CONTENTS) != 0); | |
2520 | ||
252b5132 RH |
2521 | input_section = link_order->u.indirect.section; |
2522 | input_bfd = input_section->owner; | |
44da2da1 AM |
2523 | if (input_section->size == 0) |
2524 | return TRUE; | |
252b5132 RH |
2525 | |
2526 | BFD_ASSERT (input_section->output_section == output_section); | |
2527 | BFD_ASSERT (input_section->output_offset == link_order->offset); | |
eea6121a | 2528 | BFD_ASSERT (input_section->size == link_order->size); |
252b5132 | 2529 | |
0e1862bb | 2530 | if (bfd_link_relocatable (info) |
252b5132 | 2531 | && input_section->reloc_count > 0 |
c58b9523 | 2532 | && output_section->orelocation == NULL) |
252b5132 RH |
2533 | { |
2534 | /* Space has not been allocated for the output relocations. | |
2535 | This can happen when we are called by a specific backend | |
2536 | because somebody is attempting to link together different | |
2537 | types of object files. Handling this case correctly is | |
2538 | difficult, and sometimes impossible. */ | |
4eca0228 | 2539 | _bfd_error_handler |
695344c0 | 2540 | /* xgettext:c-format */ |
1049f94e | 2541 | (_("Attempt to do relocatable link with %s input and %s output"), |
252b5132 RH |
2542 | bfd_get_target (input_bfd), bfd_get_target (output_bfd)); |
2543 | bfd_set_error (bfd_error_wrong_format); | |
b34976b6 | 2544 | return FALSE; |
252b5132 RH |
2545 | } |
2546 | ||
2547 | if (! generic_linker) | |
2548 | { | |
2549 | asymbol **sympp; | |
2550 | asymbol **symppend; | |
2551 | ||
2552 | /* Get the canonical symbols. The generic linker will always | |
2553 | have retrieved them by this point, but we are being called by | |
2554 | a specific linker, presumably because we are linking | |
2555 | different types of object files together. */ | |
5c1d2f5f | 2556 | if (!bfd_generic_link_read_symbols (input_bfd)) |
b34976b6 | 2557 | return FALSE; |
252b5132 RH |
2558 | |
2559 | /* Since we have been called by a specific linker, rather than | |
2560 | the generic linker, the values of the symbols will not be | |
2561 | right. They will be the values as seen in the input file, | |
2562 | not the values of the final link. We need to fix them up | |
2563 | before we can relocate the section. */ | |
2564 | sympp = _bfd_generic_link_get_symbols (input_bfd); | |
2565 | symppend = sympp + _bfd_generic_link_get_symcount (input_bfd); | |
2566 | for (; sympp < symppend; sympp++) | |
2567 | { | |
2568 | asymbol *sym; | |
2569 | struct bfd_link_hash_entry *h; | |
2570 | ||
2571 | sym = *sympp; | |
2572 | ||
2573 | if ((sym->flags & (BSF_INDIRECT | |
2574 | | BSF_WARNING | |
2575 | | BSF_GLOBAL | |
2576 | | BSF_CONSTRUCTOR | |
2577 | | BSF_WEAK)) != 0 | |
2578 | || bfd_is_und_section (bfd_get_section (sym)) | |
2579 | || bfd_is_com_section (bfd_get_section (sym)) | |
2580 | || bfd_is_ind_section (bfd_get_section (sym))) | |
2581 | { | |
2582 | /* sym->udata may have been set by | |
2583 | generic_link_add_symbol_list. */ | |
2584 | if (sym->udata.p != NULL) | |
a50b1753 | 2585 | h = (struct bfd_link_hash_entry *) sym->udata.p; |
252b5132 RH |
2586 | else if (bfd_is_und_section (bfd_get_section (sym))) |
2587 | h = bfd_wrapped_link_hash_lookup (output_bfd, info, | |
2588 | bfd_asymbol_name (sym), | |
b34976b6 | 2589 | FALSE, FALSE, TRUE); |
252b5132 RH |
2590 | else |
2591 | h = bfd_link_hash_lookup (info->hash, | |
2592 | bfd_asymbol_name (sym), | |
b34976b6 | 2593 | FALSE, FALSE, TRUE); |
252b5132 RH |
2594 | if (h != NULL) |
2595 | set_symbol_from_hash (sym, h); | |
2596 | } | |
509945ae | 2597 | } |
252b5132 RH |
2598 | } |
2599 | ||
bcacc0f5 AM |
2600 | if ((output_section->flags & (SEC_GROUP | SEC_LINKER_CREATED)) == SEC_GROUP |
2601 | && input_section->size != 0) | |
2602 | { | |
2603 | /* Group section contents are set by bfd_elf_set_group_contents. */ | |
2604 | if (!output_bfd->output_has_begun) | |
2605 | { | |
2606 | /* FIXME: This hack ensures bfd_elf_set_group_contents is called. */ | |
2607 | if (!bfd_set_section_contents (output_bfd, output_section, "", 0, 1)) | |
2608 | goto error_return; | |
2609 | } | |
2610 | new_contents = output_section->contents; | |
2611 | BFD_ASSERT (new_contents != NULL); | |
2612 | BFD_ASSERT (input_section->output_offset == 0); | |
2613 | } | |
2614 | else | |
2615 | { | |
2616 | /* Get and relocate the section contents. */ | |
2617 | sec_size = (input_section->rawsize > input_section->size | |
2618 | ? input_section->rawsize | |
2619 | : input_section->size); | |
a50b1753 | 2620 | contents = (bfd_byte *) bfd_malloc (sec_size); |
bcacc0f5 AM |
2621 | if (contents == NULL && sec_size != 0) |
2622 | goto error_return; | |
2623 | new_contents = (bfd_get_relocated_section_contents | |
2624 | (output_bfd, info, link_order, contents, | |
0e1862bb | 2625 | bfd_link_relocatable (info), |
bcacc0f5 AM |
2626 | _bfd_generic_link_get_symbols (input_bfd))); |
2627 | if (!new_contents) | |
2628 | goto error_return; | |
2629 | } | |
252b5132 RH |
2630 | |
2631 | /* Output the section contents. */ | |
44da2da1 | 2632 | loc = input_section->output_offset * bfd_octets_per_byte (output_bfd); |
252b5132 | 2633 | if (! bfd_set_section_contents (output_bfd, output_section, |
44da2da1 | 2634 | new_contents, loc, input_section->size)) |
252b5132 RH |
2635 | goto error_return; |
2636 | ||
2637 | if (contents != NULL) | |
2638 | free (contents); | |
b34976b6 | 2639 | return TRUE; |
252b5132 RH |
2640 | |
2641 | error_return: | |
2642 | if (contents != NULL) | |
2643 | free (contents); | |
b34976b6 | 2644 | return FALSE; |
252b5132 RH |
2645 | } |
2646 | ||
2647 | /* A little routine to count the number of relocs in a link_order | |
2648 | list. */ | |
2649 | ||
2650 | unsigned int | |
c58b9523 | 2651 | _bfd_count_link_order_relocs (struct bfd_link_order *link_order) |
252b5132 RH |
2652 | { |
2653 | register unsigned int c; | |
2654 | register struct bfd_link_order *l; | |
2655 | ||
2656 | c = 0; | |
c58b9523 | 2657 | for (l = link_order; l != NULL; l = l->next) |
252b5132 RH |
2658 | { |
2659 | if (l->type == bfd_section_reloc_link_order | |
2660 | || l->type == bfd_symbol_reloc_link_order) | |
2661 | ++c; | |
2662 | } | |
2663 | ||
2664 | return c; | |
2665 | } | |
2666 | ||
2667 | /* | |
2668 | FUNCTION | |
2669 | bfd_link_split_section | |
2670 | ||
2671 | SYNOPSIS | |
c58b9523 | 2672 | bfd_boolean bfd_link_split_section (bfd *abfd, asection *sec); |
252b5132 RH |
2673 | |
2674 | DESCRIPTION | |
2675 | Return nonzero if @var{sec} should be split during a | |
2676 | reloceatable or final link. | |
2677 | ||
2678 | .#define bfd_link_split_section(abfd, sec) \ | |
2679 | . BFD_SEND (abfd, _bfd_link_split_section, (abfd, sec)) | |
2680 | . | |
2681 | ||
2682 | */ | |
2683 | ||
b34976b6 | 2684 | bfd_boolean |
c58b9523 AM |
2685 | _bfd_generic_link_split_section (bfd *abfd ATTRIBUTE_UNUSED, |
2686 | asection *sec ATTRIBUTE_UNUSED) | |
252b5132 | 2687 | { |
b34976b6 | 2688 | return FALSE; |
252b5132 | 2689 | } |
082b7297 L |
2690 | |
2691 | /* | |
2692 | FUNCTION | |
2693 | bfd_section_already_linked | |
2694 | ||
2695 | SYNOPSIS | |
43e1669b | 2696 | bfd_boolean bfd_section_already_linked (bfd *abfd, |
c77ec726 | 2697 | asection *sec, |
43e1669b | 2698 | struct bfd_link_info *info); |
082b7297 L |
2699 | |
2700 | DESCRIPTION | |
0c511000 | 2701 | Check if @var{data} has been already linked during a reloceatable |
43e1669b | 2702 | or final link. Return TRUE if it has. |
082b7297 | 2703 | |
c77ec726 AM |
2704 | .#define bfd_section_already_linked(abfd, sec, info) \ |
2705 | . BFD_SEND (abfd, _section_already_linked, (abfd, sec, info)) | |
082b7297 L |
2706 | . |
2707 | ||
2708 | */ | |
2709 | ||
2710 | /* Sections marked with the SEC_LINK_ONCE flag should only be linked | |
2711 | once into the output. This routine checks each section, and | |
2712 | arrange to discard it if a section of the same name has already | |
68ffbac6 | 2713 | been linked. This code assumes that all relevant sections have the |
082b7297 L |
2714 | SEC_LINK_ONCE flag set; that is, it does not depend solely upon the |
2715 | section name. bfd_section_already_linked is called via | |
2716 | bfd_map_over_sections. */ | |
2717 | ||
2718 | /* The hash table. */ | |
2719 | ||
2720 | static struct bfd_hash_table _bfd_section_already_linked_table; | |
2721 | ||
2722 | /* Support routines for the hash table used by section_already_linked, | |
3d7f7666 L |
2723 | initialize the table, traverse, lookup, fill in an entry and remove |
2724 | the table. */ | |
2725 | ||
2726 | void | |
2727 | bfd_section_already_linked_table_traverse | |
2728 | (bfd_boolean (*func) (struct bfd_section_already_linked_hash_entry *, | |
2729 | void *), void *info) | |
2730 | { | |
2731 | bfd_hash_traverse (&_bfd_section_already_linked_table, | |
2732 | (bfd_boolean (*) (struct bfd_hash_entry *, | |
2733 | void *)) func, | |
2734 | info); | |
2735 | } | |
082b7297 L |
2736 | |
2737 | struct bfd_section_already_linked_hash_entry * | |
2738 | bfd_section_already_linked_table_lookup (const char *name) | |
2739 | { | |
2740 | return ((struct bfd_section_already_linked_hash_entry *) | |
2741 | bfd_hash_lookup (&_bfd_section_already_linked_table, name, | |
2742 | TRUE, FALSE)); | |
2743 | } | |
2744 | ||
a6626e8c | 2745 | bfd_boolean |
082b7297 L |
2746 | bfd_section_already_linked_table_insert |
2747 | (struct bfd_section_already_linked_hash_entry *already_linked_list, | |
c77ec726 | 2748 | asection *sec) |
082b7297 L |
2749 | { |
2750 | struct bfd_section_already_linked *l; | |
2751 | ||
2752 | /* Allocate the memory from the same obstack as the hash table is | |
2753 | kept in. */ | |
a50b1753 NC |
2754 | l = (struct bfd_section_already_linked *) |
2755 | bfd_hash_allocate (&_bfd_section_already_linked_table, sizeof *l); | |
a6626e8c MS |
2756 | if (l == NULL) |
2757 | return FALSE; | |
c77ec726 | 2758 | l->sec = sec; |
082b7297 L |
2759 | l->next = already_linked_list->entry; |
2760 | already_linked_list->entry = l; | |
a6626e8c | 2761 | return TRUE; |
082b7297 L |
2762 | } |
2763 | ||
2764 | static struct bfd_hash_entry * | |
2765 | already_linked_newfunc (struct bfd_hash_entry *entry ATTRIBUTE_UNUSED, | |
2766 | struct bfd_hash_table *table, | |
2767 | const char *string ATTRIBUTE_UNUSED) | |
2768 | { | |
2769 | struct bfd_section_already_linked_hash_entry *ret = | |
a50b1753 NC |
2770 | (struct bfd_section_already_linked_hash_entry *) |
2771 | bfd_hash_allocate (table, sizeof *ret); | |
082b7297 | 2772 | |
2d4f3e92 | 2773 | if (ret == NULL) |
a6626e8c | 2774 | return NULL; |
2d4f3e92 | 2775 | |
5ba8816a MS |
2776 | ret->entry = NULL; |
2777 | ||
082b7297 L |
2778 | return &ret->root; |
2779 | } | |
2780 | ||
2781 | bfd_boolean | |
2782 | bfd_section_already_linked_table_init (void) | |
2783 | { | |
2784 | return bfd_hash_table_init_n (&_bfd_section_already_linked_table, | |
66eb6687 AM |
2785 | already_linked_newfunc, |
2786 | sizeof (struct bfd_section_already_linked_hash_entry), | |
2787 | 42); | |
082b7297 L |
2788 | } |
2789 | ||
2790 | void | |
2791 | bfd_section_already_linked_table_free (void) | |
2792 | { | |
2793 | bfd_hash_table_free (&_bfd_section_already_linked_table); | |
2794 | } | |
2795 | ||
c77ec726 AM |
2796 | /* Report warnings as appropriate for duplicate section SEC. |
2797 | Return FALSE if we decide to keep SEC after all. */ | |
082b7297 | 2798 | |
43e1669b | 2799 | bfd_boolean |
c77ec726 AM |
2800 | _bfd_handle_already_linked (asection *sec, |
2801 | struct bfd_section_already_linked *l, | |
2802 | struct bfd_link_info *info) | |
082b7297 | 2803 | { |
c77ec726 | 2804 | switch (sec->flags & SEC_LINK_DUPLICATES) |
0c511000 | 2805 | { |
c77ec726 AM |
2806 | default: |
2807 | abort (); | |
0c511000 | 2808 | |
c77ec726 AM |
2809 | case SEC_LINK_DUPLICATES_DISCARD: |
2810 | /* If we found an LTO IR match for this comdat group on | |
2811 | the first pass, replace it with the LTO output on the | |
2812 | second pass. We can't simply choose real object | |
2813 | files over IR because the first pass may contain a | |
2814 | mix of LTO and normal objects and we must keep the | |
2815 | first match, be it IR or real. */ | |
ce875075 | 2816 | if (sec->owner->lto_output |
c77ec726 AM |
2817 | && (l->sec->owner->flags & BFD_PLUGIN) != 0) |
2818 | { | |
2819 | l->sec = sec; | |
2820 | return FALSE; | |
2821 | } | |
2822 | break; | |
0c511000 | 2823 | |
c77ec726 AM |
2824 | case SEC_LINK_DUPLICATES_ONE_ONLY: |
2825 | info->callbacks->einfo | |
695344c0 | 2826 | /* xgettext:c-format */ |
c77ec726 AM |
2827 | (_("%B: ignoring duplicate section `%A'\n"), |
2828 | sec->owner, sec); | |
2829 | break; | |
0c511000 | 2830 | |
c77ec726 AM |
2831 | case SEC_LINK_DUPLICATES_SAME_SIZE: |
2832 | if ((l->sec->owner->flags & BFD_PLUGIN) != 0) | |
2833 | ; | |
2834 | else if (sec->size != l->sec->size) | |
2835 | info->callbacks->einfo | |
695344c0 | 2836 | /* xgettext:c-format */ |
c77ec726 AM |
2837 | (_("%B: duplicate section `%A' has different size\n"), |
2838 | sec->owner, sec); | |
2839 | break; | |
0c511000 | 2840 | |
c77ec726 AM |
2841 | case SEC_LINK_DUPLICATES_SAME_CONTENTS: |
2842 | if ((l->sec->owner->flags & BFD_PLUGIN) != 0) | |
2843 | ; | |
2844 | else if (sec->size != l->sec->size) | |
2845 | info->callbacks->einfo | |
695344c0 | 2846 | /* xgettext:c-format */ |
c77ec726 AM |
2847 | (_("%B: duplicate section `%A' has different size\n"), |
2848 | sec->owner, sec); | |
2849 | else if (sec->size != 0) | |
2850 | { | |
2851 | bfd_byte *sec_contents, *l_sec_contents = NULL; | |
2852 | ||
2853 | if (!bfd_malloc_and_get_section (sec->owner, sec, &sec_contents)) | |
2854 | info->callbacks->einfo | |
695344c0 | 2855 | /* xgettext:c-format */ |
c77ec726 AM |
2856 | (_("%B: could not read contents of section `%A'\n"), |
2857 | sec->owner, sec); | |
2858 | else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec, | |
2859 | &l_sec_contents)) | |
2860 | info->callbacks->einfo | |
695344c0 | 2861 | /* xgettext:c-format */ |
c77ec726 AM |
2862 | (_("%B: could not read contents of section `%A'\n"), |
2863 | l->sec->owner, l->sec); | |
2864 | else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0) | |
2865 | info->callbacks->einfo | |
695344c0 | 2866 | /* xgettext:c-format */ |
c77ec726 AM |
2867 | (_("%B: duplicate section `%A' has different contents\n"), |
2868 | sec->owner, sec); | |
2869 | ||
2870 | if (sec_contents) | |
2871 | free (sec_contents); | |
2872 | if (l_sec_contents) | |
2873 | free (l_sec_contents); | |
2874 | } | |
2875 | break; | |
0c511000 | 2876 | } |
082b7297 | 2877 | |
c77ec726 AM |
2878 | /* Set the output_section field so that lang_add_section |
2879 | does not create a lang_input_section structure for this | |
2880 | section. Since there might be a symbol in the section | |
2881 | being discarded, we must retain a pointer to the section | |
2882 | which we are really going to use. */ | |
2883 | sec->output_section = bfd_abs_section_ptr; | |
2884 | sec->kept_section = l->sec; | |
2885 | return TRUE; | |
2886 | } | |
082b7297 | 2887 | |
c77ec726 | 2888 | /* This is used on non-ELF inputs. */ |
0c511000 | 2889 | |
c77ec726 AM |
2890 | bfd_boolean |
2891 | _bfd_generic_section_already_linked (bfd *abfd ATTRIBUTE_UNUSED, | |
2892 | asection *sec, | |
2893 | struct bfd_link_info *info) | |
2894 | { | |
2895 | const char *name; | |
2896 | struct bfd_section_already_linked *l; | |
2897 | struct bfd_section_already_linked_hash_entry *already_linked_list; | |
082b7297 | 2898 | |
c77ec726 AM |
2899 | if ((sec->flags & SEC_LINK_ONCE) == 0) |
2900 | return FALSE; | |
082b7297 | 2901 | |
c77ec726 AM |
2902 | /* The generic linker doesn't handle section groups. */ |
2903 | if ((sec->flags & SEC_GROUP) != 0) | |
2904 | return FALSE; | |
082b7297 | 2905 | |
c77ec726 AM |
2906 | /* FIXME: When doing a relocatable link, we may have trouble |
2907 | copying relocations in other sections that refer to local symbols | |
2908 | in the section being discarded. Those relocations will have to | |
2909 | be converted somehow; as of this writing I'm not sure that any of | |
2910 | the backends handle that correctly. | |
082b7297 | 2911 | |
c77ec726 AM |
2912 | It is tempting to instead not discard link once sections when |
2913 | doing a relocatable link (technically, they should be discarded | |
2914 | whenever we are building constructors). However, that fails, | |
2915 | because the linker winds up combining all the link once sections | |
2916 | into a single large link once section, which defeats the purpose | |
2917 | of having link once sections in the first place. */ | |
082b7297 | 2918 | |
c77ec726 | 2919 | name = bfd_get_section_name (abfd, sec); |
082b7297 | 2920 | |
c77ec726 | 2921 | already_linked_list = bfd_section_already_linked_table_lookup (name); |
082b7297 | 2922 | |
c77ec726 AM |
2923 | l = already_linked_list->entry; |
2924 | if (l != NULL) | |
2925 | { | |
2926 | /* The section has already been linked. See if we should | |
2927 | issue a warning. */ | |
2928 | return _bfd_handle_already_linked (sec, l, info); | |
082b7297 L |
2929 | } |
2930 | ||
2931 | /* This is the first section with this name. Record it. */ | |
c77ec726 | 2932 | if (!bfd_section_already_linked_table_insert (already_linked_list, sec)) |
bb6198d2 | 2933 | info->callbacks->einfo (_("%F%P: already_linked_table: %E\n")); |
43e1669b | 2934 | return FALSE; |
082b7297 | 2935 | } |
1e035701 | 2936 | |
051d833a AM |
2937 | /* Choose a neighbouring section to S in OBFD that will be output, or |
2938 | the absolute section if ADDR is out of bounds of the neighbours. */ | |
2939 | ||
2940 | asection * | |
2941 | _bfd_nearby_section (bfd *obfd, asection *s, bfd_vma addr) | |
2942 | { | |
2943 | asection *next, *prev, *best; | |
2944 | ||
2945 | /* Find preceding kept section. */ | |
2946 | for (prev = s->prev; prev != NULL; prev = prev->prev) | |
2947 | if ((prev->flags & SEC_EXCLUDE) == 0 | |
2948 | && !bfd_section_removed_from_list (obfd, prev)) | |
2949 | break; | |
2950 | ||
2951 | /* Find following kept section. Start at prev->next because | |
2952 | other sections may have been added after S was removed. */ | |
2953 | if (s->prev != NULL) | |
2954 | next = s->prev->next; | |
2955 | else | |
2956 | next = s->owner->sections; | |
2957 | for (; next != NULL; next = next->next) | |
2958 | if ((next->flags & SEC_EXCLUDE) == 0 | |
2959 | && !bfd_section_removed_from_list (obfd, next)) | |
2960 | break; | |
2961 | ||
2962 | /* Choose better of two sections, based on flags. The idea | |
2963 | is to choose a section that will be in the same segment | |
2964 | as S would have been if it was kept. */ | |
2965 | best = next; | |
2966 | if (prev == NULL) | |
2967 | { | |
2968 | if (next == NULL) | |
2969 | best = bfd_abs_section_ptr; | |
2970 | } | |
2971 | else if (next == NULL) | |
2972 | best = prev; | |
2973 | else if (((prev->flags ^ next->flags) | |
2974 | & (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_LOAD)) != 0) | |
2975 | { | |
2976 | if (((next->flags ^ s->flags) | |
2977 | & (SEC_ALLOC | SEC_THREAD_LOCAL)) != 0 | |
2978 | /* We prefer to choose a loaded section. Section S | |
2979 | doesn't have SEC_LOAD set (it being excluded, that | |
2980 | part of the flag processing didn't happen) so we | |
2981 | can't compare that flag to those of NEXT and PREV. */ | |
2982 | || ((prev->flags & SEC_LOAD) != 0 | |
2983 | && (next->flags & SEC_LOAD) == 0)) | |
2984 | best = prev; | |
2985 | } | |
2986 | else if (((prev->flags ^ next->flags) & SEC_READONLY) != 0) | |
2987 | { | |
2988 | if (((next->flags ^ s->flags) & SEC_READONLY) != 0) | |
2989 | best = prev; | |
2990 | } | |
2991 | else if (((prev->flags ^ next->flags) & SEC_CODE) != 0) | |
2992 | { | |
2993 | if (((next->flags ^ s->flags) & SEC_CODE) != 0) | |
2994 | best = prev; | |
2995 | } | |
2996 | else | |
2997 | { | |
2998 | /* Flags we care about are the same. Prefer the following | |
2999 | section if that will result in a positive valued sym. */ | |
3000 | if (addr < next->vma) | |
3001 | best = prev; | |
3002 | } | |
3003 | ||
051d833a AM |
3004 | return best; |
3005 | } | |
3006 | ||
74541ad4 | 3007 | /* Convert symbols in excluded output sections to use a kept section. */ |
1e035701 AM |
3008 | |
3009 | static bfd_boolean | |
3010 | fix_syms (struct bfd_link_hash_entry *h, void *data) | |
3011 | { | |
3012 | bfd *obfd = (bfd *) data; | |
3013 | ||
1e035701 AM |
3014 | if (h->type == bfd_link_hash_defined |
3015 | || h->type == bfd_link_hash_defweak) | |
3016 | { | |
3017 | asection *s = h->u.def.section; | |
3018 | if (s != NULL | |
3019 | && s->output_section != NULL | |
3020 | && (s->output_section->flags & SEC_EXCLUDE) != 0 | |
3021 | && bfd_section_removed_from_list (obfd, s->output_section)) | |
3022 | { | |
051d833a | 3023 | asection *op; |
720194ed AM |
3024 | |
3025 | h->u.def.value += s->output_offset + s->output_section->vma; | |
051d833a | 3026 | op = _bfd_nearby_section (obfd, s->output_section, h->u.def.value); |
74541ad4 AM |
3027 | h->u.def.value -= op->vma; |
3028 | h->u.def.section = op; | |
1e035701 AM |
3029 | } |
3030 | } | |
3031 | ||
3032 | return TRUE; | |
3033 | } | |
3034 | ||
3035 | void | |
3036 | _bfd_fix_excluded_sec_syms (bfd *obfd, struct bfd_link_info *info) | |
3037 | { | |
3038 | bfd_link_hash_traverse (info->hash, fix_syms, obfd); | |
3039 | } | |
3023e3f6 RS |
3040 | |
3041 | /* | |
3042 | FUNCTION | |
3043 | bfd_generic_define_common_symbol | |
3044 | ||
3045 | SYNOPSIS | |
3046 | bfd_boolean bfd_generic_define_common_symbol | |
3047 | (bfd *output_bfd, struct bfd_link_info *info, | |
3048 | struct bfd_link_hash_entry *h); | |
3049 | ||
3050 | DESCRIPTION | |
3051 | Convert common symbol @var{h} into a defined symbol. | |
3052 | Return TRUE on success and FALSE on failure. | |
3053 | ||
3054 | .#define bfd_define_common_symbol(output_bfd, info, h) \ | |
3055 | . BFD_SEND (output_bfd, _bfd_define_common_symbol, (output_bfd, info, h)) | |
3056 | . | |
3057 | */ | |
3058 | ||
3059 | bfd_boolean | |
3060 | bfd_generic_define_common_symbol (bfd *output_bfd, | |
3061 | struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
3062 | struct bfd_link_hash_entry *h) | |
3063 | { | |
3064 | unsigned int power_of_two; | |
3065 | bfd_vma alignment, size; | |
3066 | asection *section; | |
3067 | ||
3068 | BFD_ASSERT (h != NULL && h->type == bfd_link_hash_common); | |
3069 | ||
3070 | size = h->u.c.size; | |
3071 | power_of_two = h->u.c.p->alignment_power; | |
3072 | section = h->u.c.p->section; | |
3073 | ||
3074 | /* Increase the size of the section to align the common symbol. | |
3075 | The alignment must be a power of two. */ | |
3076 | alignment = bfd_octets_per_byte (output_bfd) << power_of_two; | |
3077 | BFD_ASSERT (alignment != 0 && (alignment & -alignment) == alignment); | |
3078 | section->size += alignment - 1; | |
3079 | section->size &= -alignment; | |
3080 | ||
3081 | /* Adjust the section's overall alignment if necessary. */ | |
3082 | if (power_of_two > section->alignment_power) | |
3083 | section->alignment_power = power_of_two; | |
3084 | ||
3085 | /* Change the symbol from common to defined. */ | |
3086 | h->type = bfd_link_hash_defined; | |
3087 | h->u.def.section = section; | |
3088 | h->u.def.value = section->size; | |
3089 | ||
3090 | /* Increase the size of the section. */ | |
3091 | section->size += size; | |
3092 | ||
3093 | /* Make sure the section is allocated in memory, and make sure that | |
3094 | it is no longer a common section. */ | |
3095 | section->flags |= SEC_ALLOC; | |
3096 | section->flags &= ~SEC_IS_COMMON; | |
3097 | return TRUE; | |
3098 | } | |
09e2aba4 | 3099 | |
7dba9362 AM |
3100 | /* |
3101 | FUNCTION | |
3102 | bfd_generic_define_start_stop | |
3103 | ||
3104 | SYNOPSIS | |
3105 | struct bfd_link_hash_entry *bfd_generic_define_start_stop | |
3106 | (struct bfd_link_info *info, | |
3107 | const char *symbol, asection *sec); | |
3108 | ||
3109 | DESCRIPTION | |
3110 | Define a __start, __stop, .startof. or .sizeof. symbol. | |
3111 | Return the symbol or NULL if no such undefined symbol exists. | |
3112 | ||
3113 | .#define bfd_define_start_stop(output_bfd, info, symbol, sec) \ | |
3114 | . BFD_SEND (output_bfd, _bfd_define_start_stop, (info, symbol, sec)) | |
3115 | . | |
3116 | */ | |
3117 | ||
3118 | struct bfd_link_hash_entry * | |
3119 | bfd_generic_define_start_stop (struct bfd_link_info *info, | |
3120 | const char *symbol, asection *sec) | |
3121 | { | |
3122 | struct bfd_link_hash_entry *h; | |
3123 | ||
3124 | h = bfd_link_hash_lookup (info->hash, symbol, FALSE, FALSE, TRUE); | |
3125 | if (h != NULL | |
3126 | && (h->type == bfd_link_hash_undefined | |
3127 | || h->type == bfd_link_hash_undefweak)) | |
3128 | { | |
3129 | h->type = bfd_link_hash_defined; | |
3130 | h->u.def.section = sec; | |
3131 | h->u.def.value = 0; | |
3132 | return h; | |
3133 | } | |
3134 | return NULL; | |
3135 | } | |
3136 | ||
09e2aba4 DK |
3137 | /* |
3138 | FUNCTION | |
68ffbac6 | 3139 | bfd_find_version_for_sym |
09e2aba4 DK |
3140 | |
3141 | SYNOPSIS | |
3142 | struct bfd_elf_version_tree * bfd_find_version_for_sym | |
3143 | (struct bfd_elf_version_tree *verdefs, | |
3144 | const char *sym_name, bfd_boolean *hide); | |
3145 | ||
3146 | DESCRIPTION | |
3147 | Search an elf version script tree for symbol versioning | |
3148 | info and export / don't-export status for a given symbol. | |
3149 | Return non-NULL on success and NULL on failure; also sets | |
3150 | the output @samp{hide} boolean parameter. | |
3151 | ||
3152 | */ | |
3153 | ||
3154 | struct bfd_elf_version_tree * | |
3155 | bfd_find_version_for_sym (struct bfd_elf_version_tree *verdefs, | |
78a03297 AM |
3156 | const char *sym_name, |
3157 | bfd_boolean *hide) | |
09e2aba4 DK |
3158 | { |
3159 | struct bfd_elf_version_tree *t; | |
3160 | struct bfd_elf_version_tree *local_ver, *global_ver, *exist_ver; | |
78a03297 | 3161 | struct bfd_elf_version_tree *star_local_ver, *star_global_ver; |
09e2aba4 DK |
3162 | |
3163 | local_ver = NULL; | |
3164 | global_ver = NULL; | |
78a03297 AM |
3165 | star_local_ver = NULL; |
3166 | star_global_ver = NULL; | |
09e2aba4 DK |
3167 | exist_ver = NULL; |
3168 | for (t = verdefs; t != NULL; t = t->next) | |
3169 | { | |
3170 | if (t->globals.list != NULL) | |
3171 | { | |
3172 | struct bfd_elf_version_expr *d = NULL; | |
3173 | ||
3174 | while ((d = (*t->match) (&t->globals, d, sym_name)) != NULL) | |
3175 | { | |
78a03297 AM |
3176 | if (d->literal || strcmp (d->pattern, "*") != 0) |
3177 | global_ver = t; | |
3178 | else | |
3179 | star_global_ver = t; | |
09e2aba4 DK |
3180 | if (d->symver) |
3181 | exist_ver = t; | |
3182 | d->script = 1; | |
3183 | /* If the match is a wildcard pattern, keep looking for | |
3184 | a more explicit, perhaps even local, match. */ | |
3185 | if (d->literal) | |
0666b2c3 | 3186 | break; |
09e2aba4 DK |
3187 | } |
3188 | ||
3189 | if (d != NULL) | |
3190 | break; | |
3191 | } | |
3192 | ||
3193 | if (t->locals.list != NULL) | |
3194 | { | |
3195 | struct bfd_elf_version_expr *d = NULL; | |
3196 | ||
3197 | while ((d = (*t->match) (&t->locals, d, sym_name)) != NULL) | |
3198 | { | |
78a03297 AM |
3199 | if (d->literal || strcmp (d->pattern, "*") != 0) |
3200 | local_ver = t; | |
3201 | else | |
3202 | star_local_ver = t; | |
09e2aba4 DK |
3203 | /* If the match is a wildcard pattern, keep looking for |
3204 | a more explicit, perhaps even global, match. */ | |
3205 | if (d->literal) | |
3206 | { | |
3207 | /* An exact match overrides a global wildcard. */ | |
3208 | global_ver = NULL; | |
78a03297 | 3209 | star_global_ver = NULL; |
09e2aba4 DK |
3210 | break; |
3211 | } | |
3212 | } | |
3213 | ||
3214 | if (d != NULL) | |
3215 | break; | |
3216 | } | |
3217 | } | |
3218 | ||
78a03297 AM |
3219 | if (global_ver == NULL && local_ver == NULL) |
3220 | global_ver = star_global_ver; | |
3221 | ||
09e2aba4 DK |
3222 | if (global_ver != NULL) |
3223 | { | |
3224 | /* If we already have a versioned symbol that matches the | |
3225 | node for this symbol, then we don't want to create a | |
3226 | duplicate from the unversioned symbol. Instead hide the | |
3227 | unversioned symbol. */ | |
3228 | *hide = exist_ver == global_ver; | |
3229 | return global_ver; | |
3230 | } | |
3231 | ||
78a03297 AM |
3232 | if (local_ver == NULL) |
3233 | local_ver = star_local_ver; | |
3234 | ||
09e2aba4 DK |
3235 | if (local_ver != NULL) |
3236 | { | |
3237 | *hide = TRUE; | |
3238 | return local_ver; | |
3239 | } | |
3240 | ||
3241 | return NULL; | |
3242 | } | |
fd91d419 L |
3243 | |
3244 | /* | |
3245 | FUNCTION | |
3246 | bfd_hide_sym_by_version | |
3247 | ||
3248 | SYNOPSIS | |
3249 | bfd_boolean bfd_hide_sym_by_version | |
3250 | (struct bfd_elf_version_tree *verdefs, const char *sym_name); | |
3251 | ||
3252 | DESCRIPTION | |
3253 | Search an elf version script tree for symbol versioning | |
3254 | info for a given symbol. Return TRUE if the symbol is hidden. | |
3255 | ||
3256 | */ | |
3257 | ||
3258 | bfd_boolean | |
3259 | bfd_hide_sym_by_version (struct bfd_elf_version_tree *verdefs, | |
3260 | const char *sym_name) | |
3261 | { | |
3262 | bfd_boolean hidden = FALSE; | |
3263 | bfd_find_version_for_sym (verdefs, sym_name, &hidden); | |
3264 | return hidden; | |
3265 | } | |
4f3b23b3 NC |
3266 | |
3267 | /* | |
3268 | FUNCTION | |
3269 | bfd_link_check_relocs | |
3270 | ||
3271 | SYNOPSIS | |
3272 | bfd_boolean bfd_link_check_relocs | |
3273 | (bfd *abfd, struct bfd_link_info *info); | |
3274 | ||
3275 | DESCRIPTION | |
3276 | Checks the relocs in ABFD for validity. | |
3277 | Does not execute the relocs. | |
3278 | Return TRUE if everything is OK, FALSE otherwise. | |
3279 | This is the external entry point to this code. | |
3280 | */ | |
3281 | ||
3282 | bfd_boolean | |
3283 | bfd_link_check_relocs (bfd *abfd, struct bfd_link_info *info) | |
3284 | { | |
3285 | return BFD_SEND (abfd, _bfd_link_check_relocs, (abfd, info)); | |
3286 | } | |
3287 | ||
3288 | /* | |
3289 | FUNCTION | |
3290 | _bfd_generic_link_check_relocs | |
3291 | ||
3292 | SYNOPSIS | |
3293 | bfd_boolean _bfd_generic_link_check_relocs | |
3294 | (bfd *abfd, struct bfd_link_info *info); | |
3295 | ||
3296 | DESCRIPTION | |
3297 | Stub function for targets that do not implement reloc checking. | |
3298 | Return TRUE. | |
3299 | This is an internal function. It should not be called from | |
3300 | outside the BFD library. | |
3301 | */ | |
3302 | ||
3303 | bfd_boolean | |
3304 | _bfd_generic_link_check_relocs (bfd *abfd ATTRIBUTE_UNUSED, | |
3305 | struct bfd_link_info *info ATTRIBUTE_UNUSED) | |
3306 | { | |
3307 | return TRUE; | |
3308 | } | |
1047201f AM |
3309 | |
3310 | /* | |
3311 | FUNCTION | |
3312 | bfd_merge_private_bfd_data | |
3313 | ||
3314 | SYNOPSIS | |
50e03d47 AM |
3315 | bfd_boolean bfd_merge_private_bfd_data |
3316 | (bfd *ibfd, struct bfd_link_info *info); | |
1047201f AM |
3317 | |
3318 | DESCRIPTION | |
3319 | Merge private BFD information from the BFD @var{ibfd} to the | |
50e03d47 | 3320 | the output file BFD when linking. Return <<TRUE>> on success, |
1047201f AM |
3321 | <<FALSE>> on error. Possible error returns are: |
3322 | ||
3323 | o <<bfd_error_no_memory>> - | |
3324 | Not enough memory exists to create private data for @var{obfd}. | |
3325 | ||
50e03d47 AM |
3326 | .#define bfd_merge_private_bfd_data(ibfd, info) \ |
3327 | . BFD_SEND ((info)->output_bfd, _bfd_merge_private_bfd_data, \ | |
3328 | . (ibfd, info)) | |
1047201f AM |
3329 | */ |
3330 | ||
3331 | /* | |
3332 | INTERNAL_FUNCTION | |
3333 | _bfd_generic_verify_endian_match | |
3334 | ||
3335 | SYNOPSIS | |
3336 | bfd_boolean _bfd_generic_verify_endian_match | |
50e03d47 | 3337 | (bfd *ibfd, struct bfd_link_info *info); |
1047201f AM |
3338 | |
3339 | DESCRIPTION | |
3340 | Can be used from / for bfd_merge_private_bfd_data to check that | |
3341 | endianness matches between input and output file. Returns | |
3342 | TRUE for a match, otherwise returns FALSE and emits an error. | |
3343 | */ | |
3344 | ||
3345 | bfd_boolean | |
50e03d47 | 3346 | _bfd_generic_verify_endian_match (bfd *ibfd, struct bfd_link_info *info) |
1047201f | 3347 | { |
50e03d47 AM |
3348 | bfd *obfd = info->output_bfd; |
3349 | ||
1047201f AM |
3350 | if (ibfd->xvec->byteorder != obfd->xvec->byteorder |
3351 | && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN | |
3352 | && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) | |
3353 | { | |
3354 | if (bfd_big_endian (ibfd)) | |
3355 | _bfd_error_handler (_("%B: compiled for a big endian system " | |
3356 | "and target is little endian"), ibfd); | |
3357 | else | |
3358 | _bfd_error_handler (_("%B: compiled for a little endian system " | |
3359 | "and target is big endian"), ibfd); | |
3360 | bfd_set_error (bfd_error_wrong_format); | |
3361 | return FALSE; | |
3362 | } | |
3363 | ||
3364 | return TRUE; | |
3365 | } |