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494e05f4 ILT |
1 | // script-sections.cc -- linker script SECTIONS for gold |
2 | ||
0d371ad3 | 3 | // Copyright 2008, 2009 Free Software Foundation, Inc. |
494e05f4 ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
23 | #include "gold.h" | |
24 | ||
a445fddf ILT |
25 | #include <cstring> |
26 | #include <algorithm> | |
27 | #include <list> | |
1c4f3631 | 28 | #include <map> |
494e05f4 ILT |
29 | #include <string> |
30 | #include <vector> | |
a445fddf | 31 | #include <fnmatch.h> |
494e05f4 | 32 | |
a445fddf ILT |
33 | #include "parameters.h" |
34 | #include "object.h" | |
35 | #include "layout.h" | |
36 | #include "output.h" | |
494e05f4 ILT |
37 | #include "script-c.h" |
38 | #include "script.h" | |
39 | #include "script-sections.h" | |
40 | ||
41 | // Support for the SECTIONS clause in linker scripts. | |
42 | ||
43 | namespace gold | |
44 | { | |
45 | ||
0d371ad3 ILT |
46 | // Manage orphan sections. This is intended to be largely compatible |
47 | // with the GNU linker. The Linux kernel implicitly relies on | |
48 | // something similar to the GNU linker's orphan placement. We | |
49 | // originally used a simpler scheme here, but it caused the kernel | |
50 | // build to fail, and was also rather inefficient. | |
51 | ||
52 | class Orphan_section_placement | |
53 | { | |
54 | private: | |
55 | typedef Script_sections::Elements_iterator Elements_iterator; | |
56 | ||
57 | public: | |
58 | Orphan_section_placement(); | |
59 | ||
60 | // Handle an output section during initialization of this mapping. | |
61 | void | |
62 | output_section_init(const std::string& name, Output_section*, | |
63 | Elements_iterator location); | |
64 | ||
65 | // Initialize the last location. | |
66 | void | |
67 | last_init(Elements_iterator location); | |
68 | ||
69 | // Set *PWHERE to the address of an iterator pointing to the | |
70 | // location to use for an orphan section. Return true if the | |
71 | // iterator has a value, false otherwise. | |
72 | bool | |
73 | find_place(Output_section*, Elements_iterator** pwhere); | |
74 | ||
75 | // Return the iterator being used for sections at the very end of | |
76 | // the linker script. | |
77 | Elements_iterator | |
78 | last_place() const; | |
79 | ||
80 | private: | |
81 | // The places that we specifically recognize. This list is copied | |
82 | // from the GNU linker. | |
83 | enum Place_index | |
84 | { | |
85 | PLACE_TEXT, | |
86 | PLACE_RODATA, | |
87 | PLACE_DATA, | |
88 | PLACE_BSS, | |
89 | PLACE_REL, | |
90 | PLACE_INTERP, | |
91 | PLACE_NONALLOC, | |
92 | PLACE_LAST, | |
93 | PLACE_MAX | |
94 | }; | |
95 | ||
96 | // The information we keep for a specific place. | |
97 | struct Place | |
98 | { | |
99 | // The name of sections for this place. | |
100 | const char* name; | |
101 | // Whether we have a location for this place. | |
102 | bool have_location; | |
103 | // The iterator for this place. | |
104 | Elements_iterator location; | |
105 | }; | |
106 | ||
107 | // Initialize one place element. | |
108 | void | |
109 | initialize_place(Place_index, const char*); | |
110 | ||
111 | // The places. | |
112 | Place places_[PLACE_MAX]; | |
113 | // True if this is the first call to output_section_init. | |
114 | bool first_init_; | |
115 | }; | |
116 | ||
117 | // Initialize Orphan_section_placement. | |
118 | ||
119 | Orphan_section_placement::Orphan_section_placement() | |
120 | : first_init_(true) | |
121 | { | |
122 | this->initialize_place(PLACE_TEXT, ".text"); | |
123 | this->initialize_place(PLACE_RODATA, ".rodata"); | |
124 | this->initialize_place(PLACE_DATA, ".data"); | |
125 | this->initialize_place(PLACE_BSS, ".bss"); | |
126 | this->initialize_place(PLACE_REL, NULL); | |
127 | this->initialize_place(PLACE_INTERP, ".interp"); | |
128 | this->initialize_place(PLACE_NONALLOC, NULL); | |
129 | this->initialize_place(PLACE_LAST, NULL); | |
130 | } | |
131 | ||
132 | // Initialize one place element. | |
133 | ||
134 | void | |
135 | Orphan_section_placement::initialize_place(Place_index index, const char* name) | |
136 | { | |
137 | this->places_[index].name = name; | |
138 | this->places_[index].have_location = false; | |
139 | } | |
140 | ||
141 | // While initializing the Orphan_section_placement information, this | |
142 | // is called once for each output section named in the linker script. | |
143 | // If we found an output section during the link, it will be passed in | |
144 | // OS. | |
145 | ||
146 | void | |
147 | Orphan_section_placement::output_section_init(const std::string& name, | |
148 | Output_section* os, | |
149 | Elements_iterator location) | |
150 | { | |
151 | bool first_init = this->first_init_; | |
152 | this->first_init_ = false; | |
153 | ||
154 | for (int i = 0; i < PLACE_MAX; ++i) | |
155 | { | |
156 | if (this->places_[i].name != NULL && this->places_[i].name == name) | |
157 | { | |
158 | if (this->places_[i].have_location) | |
159 | { | |
160 | // We have already seen a section with this name. | |
161 | return; | |
162 | } | |
163 | ||
164 | this->places_[i].location = location; | |
165 | this->places_[i].have_location = true; | |
166 | ||
167 | // If we just found the .bss section, restart the search for | |
168 | // an unallocated section. This follows the GNU linker's | |
169 | // behaviour. | |
170 | if (i == PLACE_BSS) | |
171 | this->places_[PLACE_NONALLOC].have_location = false; | |
172 | ||
173 | return; | |
174 | } | |
175 | } | |
176 | ||
177 | // Relocation sections. | |
178 | if (!this->places_[PLACE_REL].have_location | |
179 | && os != NULL | |
180 | && (os->type() == elfcpp::SHT_REL || os->type() == elfcpp::SHT_RELA) | |
181 | && (os->flags() & elfcpp::SHF_ALLOC) != 0) | |
182 | { | |
183 | this->places_[PLACE_REL].location = location; | |
184 | this->places_[PLACE_REL].have_location = true; | |
185 | } | |
186 | ||
187 | // We find the location for unallocated sections by finding the | |
188 | // first debugging or comment section after the BSS section (if | |
189 | // there is one). | |
190 | if (!this->places_[PLACE_NONALLOC].have_location | |
191 | && (name == ".comment" || Layout::is_debug_info_section(name.c_str()))) | |
192 | { | |
193 | // We add orphan sections after the location in PLACES_. We | |
194 | // want to store unallocated sections before LOCATION. If this | |
195 | // is the very first section, we can't use it. | |
196 | if (!first_init) | |
197 | { | |
198 | --location; | |
199 | this->places_[PLACE_NONALLOC].location = location; | |
200 | this->places_[PLACE_NONALLOC].have_location = true; | |
201 | } | |
202 | } | |
203 | } | |
204 | ||
205 | // Initialize the last location. | |
206 | ||
207 | void | |
208 | Orphan_section_placement::last_init(Elements_iterator location) | |
209 | { | |
210 | this->places_[PLACE_LAST].location = location; | |
211 | this->places_[PLACE_LAST].have_location = true; | |
212 | } | |
213 | ||
214 | // Set *PWHERE to the address of an iterator pointing to the location | |
215 | // to use for an orphan section. Return true if the iterator has a | |
216 | // value, false otherwise. | |
217 | ||
218 | bool | |
219 | Orphan_section_placement::find_place(Output_section* os, | |
220 | Elements_iterator** pwhere) | |
221 | { | |
222 | // Figure out where OS should go. This is based on the GNU linker | |
223 | // code. FIXME: The GNU linker handles small data sections | |
224 | // specially, but we don't. | |
225 | elfcpp::Elf_Word type = os->type(); | |
226 | elfcpp::Elf_Xword flags = os->flags(); | |
227 | Place_index index; | |
228 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
229 | && !Layout::is_debug_info_section(os->name())) | |
230 | index = PLACE_NONALLOC; | |
231 | else if ((flags & elfcpp::SHF_ALLOC) == 0) | |
232 | index = PLACE_LAST; | |
233 | else if (type == elfcpp::SHT_NOTE) | |
234 | index = PLACE_INTERP; | |
235 | else if (type == elfcpp::SHT_NOBITS) | |
236 | index = PLACE_BSS; | |
237 | else if ((flags & elfcpp::SHF_WRITE) != 0) | |
238 | index = PLACE_DATA; | |
239 | else if (type == elfcpp::SHT_REL || type == elfcpp::SHT_RELA) | |
240 | index = PLACE_REL; | |
241 | else if ((flags & elfcpp::SHF_EXECINSTR) == 0) | |
242 | index = PLACE_RODATA; | |
243 | else | |
244 | index = PLACE_TEXT; | |
245 | ||
246 | // If we don't have a location yet, try to find one based on a | |
247 | // plausible ordering of sections. | |
248 | if (!this->places_[index].have_location) | |
249 | { | |
250 | Place_index follow; | |
251 | switch (index) | |
252 | { | |
253 | default: | |
254 | follow = PLACE_MAX; | |
255 | break; | |
256 | case PLACE_RODATA: | |
257 | follow = PLACE_TEXT; | |
258 | break; | |
259 | case PLACE_BSS: | |
260 | follow = PLACE_DATA; | |
261 | break; | |
262 | case PLACE_REL: | |
263 | follow = PLACE_TEXT; | |
264 | break; | |
265 | case PLACE_INTERP: | |
266 | follow = PLACE_TEXT; | |
267 | break; | |
268 | } | |
269 | if (follow != PLACE_MAX && this->places_[follow].have_location) | |
270 | { | |
271 | // Set the location of INDEX to the location of FOLLOW. The | |
272 | // location of INDEX will then be incremented by the caller, | |
273 | // so anything in INDEX will continue to be after anything | |
274 | // in FOLLOW. | |
275 | this->places_[index].location = this->places_[follow].location; | |
276 | this->places_[index].have_location = true; | |
277 | } | |
278 | } | |
279 | ||
280 | *pwhere = &this->places_[index].location; | |
281 | bool ret = this->places_[index].have_location; | |
282 | ||
283 | // The caller will set the location. | |
284 | this->places_[index].have_location = true; | |
285 | ||
286 | return ret; | |
287 | } | |
288 | ||
289 | // Return the iterator being used for sections at the very end of the | |
290 | // linker script. | |
291 | ||
292 | Orphan_section_placement::Elements_iterator | |
293 | Orphan_section_placement::last_place() const | |
294 | { | |
295 | gold_assert(this->places_[PLACE_LAST].have_location); | |
296 | return this->places_[PLACE_LAST].location; | |
297 | } | |
298 | ||
494e05f4 ILT |
299 | // An element in a SECTIONS clause. |
300 | ||
301 | class Sections_element | |
302 | { | |
303 | public: | |
304 | Sections_element() | |
305 | { } | |
306 | ||
307 | virtual ~Sections_element() | |
308 | { } | |
309 | ||
0d371ad3 ILT |
310 | // Return whether an output section is relro. |
311 | virtual bool | |
312 | is_relro() const | |
313 | { return false; } | |
314 | ||
2d924fd9 ILT |
315 | // Record that an output section is relro. |
316 | virtual void | |
317 | set_is_relro() | |
318 | { } | |
319 | ||
919ed24c ILT |
320 | // Create any required output sections. The only real |
321 | // implementation is in Output_section_definition. | |
322 | virtual void | |
323 | create_sections(Layout*) | |
324 | { } | |
325 | ||
a445fddf ILT |
326 | // Add any symbol being defined to the symbol table. |
327 | virtual void | |
328 | add_symbols_to_table(Symbol_table*) | |
329 | { } | |
330 | ||
331 | // Finalize symbols and check assertions. | |
332 | virtual void | |
77e65537 | 333 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*) |
a445fddf ILT |
334 | { } |
335 | ||
336 | // Return the output section name to use for an input file name and | |
337 | // section name. This only real implementation is in | |
338 | // Output_section_definition. | |
339 | virtual const char* | |
340 | output_section_name(const char*, const char*, Output_section***) | |
341 | { return NULL; } | |
342 | ||
0d371ad3 ILT |
343 | // Initialize OSP with an output section. |
344 | virtual void | |
345 | orphan_section_init(Orphan_section_placement*, | |
346 | Script_sections::Elements_iterator) | |
347 | { } | |
a445fddf ILT |
348 | |
349 | // Set section addresses. This includes applying assignments if the | |
350 | // the expression is an absolute value. | |
351 | virtual void | |
fd247bfe | 352 | set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*) |
a445fddf ILT |
353 | { } |
354 | ||
3802b2dd ILT |
355 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
356 | // this section is constrained, and the input sections do not match, | |
357 | // return the constraint, and set *POSD. | |
358 | virtual Section_constraint | |
359 | check_constraint(Output_section_definition**) | |
360 | { return CONSTRAINT_NONE; } | |
361 | ||
362 | // See if this is the alternate output section for a constrained | |
363 | // output section. If it is, transfer the Output_section and return | |
364 | // true. Otherwise return false. | |
365 | virtual bool | |
366 | alternate_constraint(Output_section_definition*, Section_constraint) | |
367 | { return false; } | |
368 | ||
1c4f3631 ILT |
369 | // Get the list of segments to use for an allocated section when |
370 | // using a PHDRS clause. If this is an allocated section, return | |
2cefc357 ILT |
371 | // the Output_section, and set *PHDRS_LIST (the first parameter) to |
372 | // the list of PHDRS to which it should be attached. If the PHDRS | |
373 | // were not specified, don't change *PHDRS_LIST. When not returning | |
374 | // NULL, set *ORPHAN (the second parameter) according to whether | |
375 | // this is an orphan section--one that is not mentioned in the | |
376 | // linker script. | |
1c4f3631 | 377 | virtual Output_section* |
2cefc357 | 378 | allocate_to_segment(String_list**, bool*) |
1c4f3631 ILT |
379 | { return NULL; } |
380 | ||
8f2eb564 ILT |
381 | // Look for an output section by name and return the address, the |
382 | // load address, the alignment, and the size. This is used when an | |
383 | // expression refers to an output section which was not actually | |
384 | // created. This returns true if the section was found, false | |
385 | // otherwise. The only real definition is for | |
386 | // Output_section_definition. | |
387 | virtual bool | |
388 | get_output_section_info(const char*, uint64_t*, uint64_t*, uint64_t*, | |
389 | uint64_t*) const | |
390 | { return false; } | |
391 | ||
2d924fd9 ILT |
392 | // Return the associated Output_section if there is one. |
393 | virtual Output_section* | |
394 | get_output_section() const | |
395 | { return NULL; } | |
396 | ||
a445fddf | 397 | // Print the element for debugging purposes. |
494e05f4 ILT |
398 | virtual void |
399 | print(FILE* f) const = 0; | |
400 | }; | |
401 | ||
402 | // An assignment in a SECTIONS clause outside of an output section. | |
403 | ||
404 | class Sections_element_assignment : public Sections_element | |
405 | { | |
406 | public: | |
407 | Sections_element_assignment(const char* name, size_t namelen, | |
408 | Expression* val, bool provide, bool hidden) | |
409 | : assignment_(name, namelen, val, provide, hidden) | |
410 | { } | |
411 | ||
a445fddf ILT |
412 | // Add the symbol to the symbol table. |
413 | void | |
414 | add_symbols_to_table(Symbol_table* symtab) | |
415 | { this->assignment_.add_to_table(symtab); } | |
416 | ||
417 | // Finalize the symbol. | |
418 | void | |
419 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 420 | uint64_t* dot_value) |
a445fddf | 421 | { |
77e65537 | 422 | this->assignment_.finalize_with_dot(symtab, layout, *dot_value, NULL); |
a445fddf ILT |
423 | } |
424 | ||
425 | // Set the section address. There is no section here, but if the | |
426 | // value is absolute, we set the symbol. This permits us to use | |
427 | // absolute symbols when setting dot. | |
428 | void | |
429 | set_section_addresses(Symbol_table* symtab, Layout* layout, | |
fd247bfe | 430 | uint64_t* dot_value, uint64_t*) |
a445fddf | 431 | { |
77e65537 | 432 | this->assignment_.set_if_absolute(symtab, layout, true, *dot_value); |
a445fddf ILT |
433 | } |
434 | ||
435 | // Print for debugging. | |
494e05f4 ILT |
436 | void |
437 | print(FILE* f) const | |
438 | { | |
439 | fprintf(f, " "); | |
440 | this->assignment_.print(f); | |
441 | } | |
442 | ||
443 | private: | |
444 | Symbol_assignment assignment_; | |
445 | }; | |
446 | ||
a445fddf ILT |
447 | // An assignment to the dot symbol in a SECTIONS clause outside of an |
448 | // output section. | |
449 | ||
450 | class Sections_element_dot_assignment : public Sections_element | |
451 | { | |
452 | public: | |
453 | Sections_element_dot_assignment(Expression* val) | |
454 | : val_(val) | |
455 | { } | |
456 | ||
457 | // Finalize the symbol. | |
458 | void | |
459 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 460 | uint64_t* dot_value) |
a445fddf | 461 | { |
77e65537 ILT |
462 | // We ignore the section of the result because outside of an |
463 | // output section definition the dot symbol is always considered | |
464 | // to be absolute. | |
465 | Output_section* dummy; | |
919ed24c | 466 | *dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 | 467 | NULL, &dummy); |
a445fddf ILT |
468 | } |
469 | ||
470 | // Update the dot symbol while setting section addresses. | |
471 | void | |
472 | set_section_addresses(Symbol_table* symtab, Layout* layout, | |
fd247bfe | 473 | uint64_t* dot_value, uint64_t* load_address) |
a445fddf | 474 | { |
77e65537 | 475 | Output_section* dummy; |
919ed24c | 476 | *dot_value = this->val_->eval_with_dot(symtab, layout, false, *dot_value, |
77e65537 | 477 | NULL, &dummy); |
fd247bfe | 478 | *load_address = *dot_value; |
a445fddf ILT |
479 | } |
480 | ||
481 | // Print for debugging. | |
482 | void | |
483 | print(FILE* f) const | |
484 | { | |
485 | fprintf(f, " . = "); | |
486 | this->val_->print(f); | |
487 | fprintf(f, "\n"); | |
488 | } | |
489 | ||
490 | private: | |
491 | Expression* val_; | |
492 | }; | |
493 | ||
494e05f4 ILT |
494 | // An assertion in a SECTIONS clause outside of an output section. |
495 | ||
496 | class Sections_element_assertion : public Sections_element | |
497 | { | |
498 | public: | |
499 | Sections_element_assertion(Expression* check, const char* message, | |
500 | size_t messagelen) | |
501 | : assertion_(check, message, messagelen) | |
502 | { } | |
503 | ||
a445fddf ILT |
504 | // Check the assertion. |
505 | void | |
77e65537 | 506 | finalize_symbols(Symbol_table* symtab, const Layout* layout, uint64_t*) |
a445fddf ILT |
507 | { this->assertion_.check(symtab, layout); } |
508 | ||
509 | // Print for debugging. | |
494e05f4 ILT |
510 | void |
511 | print(FILE* f) const | |
512 | { | |
513 | fprintf(f, " "); | |
514 | this->assertion_.print(f); | |
515 | } | |
516 | ||
517 | private: | |
518 | Script_assertion assertion_; | |
519 | }; | |
520 | ||
521 | // An element in an output section in a SECTIONS clause. | |
522 | ||
523 | class Output_section_element | |
524 | { | |
525 | public: | |
a445fddf ILT |
526 | // A list of input sections. |
527 | typedef std::list<std::pair<Relobj*, unsigned int> > Input_section_list; | |
528 | ||
494e05f4 ILT |
529 | Output_section_element() |
530 | { } | |
531 | ||
532 | virtual ~Output_section_element() | |
533 | { } | |
534 | ||
919ed24c ILT |
535 | // Return whether this element requires an output section to exist. |
536 | virtual bool | |
537 | needs_output_section() const | |
538 | { return false; } | |
539 | ||
a445fddf ILT |
540 | // Add any symbol being defined to the symbol table. |
541 | virtual void | |
542 | add_symbols_to_table(Symbol_table*) | |
543 | { } | |
544 | ||
545 | // Finalize symbols and check assertions. | |
546 | virtual void | |
77e65537 | 547 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*, Output_section**) |
a445fddf ILT |
548 | { } |
549 | ||
550 | // Return whether this element matches FILE_NAME and SECTION_NAME. | |
551 | // The only real implementation is in Output_section_element_input. | |
552 | virtual bool | |
553 | match_name(const char*, const char*) const | |
554 | { return false; } | |
555 | ||
556 | // Set section addresses. This includes applying assignments if the | |
557 | // the expression is an absolute value. | |
558 | virtual void | |
559 | set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t, | |
77e65537 ILT |
560 | uint64_t*, Output_section**, std::string*, |
561 | Input_section_list*) | |
a445fddf ILT |
562 | { } |
563 | ||
564 | // Print the element for debugging purposes. | |
494e05f4 ILT |
565 | virtual void |
566 | print(FILE* f) const = 0; | |
a445fddf ILT |
567 | |
568 | protected: | |
569 | // Return a fill string that is LENGTH bytes long, filling it with | |
570 | // FILL. | |
571 | std::string | |
572 | get_fill_string(const std::string* fill, section_size_type length) const; | |
494e05f4 ILT |
573 | }; |
574 | ||
a445fddf ILT |
575 | std::string |
576 | Output_section_element::get_fill_string(const std::string* fill, | |
577 | section_size_type length) const | |
578 | { | |
579 | std::string this_fill; | |
580 | this_fill.reserve(length); | |
581 | while (this_fill.length() + fill->length() <= length) | |
582 | this_fill += *fill; | |
583 | if (this_fill.length() < length) | |
584 | this_fill.append(*fill, 0, length - this_fill.length()); | |
585 | return this_fill; | |
586 | } | |
587 | ||
494e05f4 ILT |
588 | // A symbol assignment in an output section. |
589 | ||
590 | class Output_section_element_assignment : public Output_section_element | |
591 | { | |
592 | public: | |
593 | Output_section_element_assignment(const char* name, size_t namelen, | |
594 | Expression* val, bool provide, | |
595 | bool hidden) | |
596 | : assignment_(name, namelen, val, provide, hidden) | |
597 | { } | |
598 | ||
a445fddf ILT |
599 | // Add the symbol to the symbol table. |
600 | void | |
601 | add_symbols_to_table(Symbol_table* symtab) | |
602 | { this->assignment_.add_to_table(symtab); } | |
603 | ||
604 | // Finalize the symbol. | |
605 | void | |
606 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 607 | uint64_t* dot_value, Output_section** dot_section) |
a445fddf | 608 | { |
77e65537 ILT |
609 | this->assignment_.finalize_with_dot(symtab, layout, *dot_value, |
610 | *dot_section); | |
a445fddf ILT |
611 | } |
612 | ||
613 | // Set the section address. There is no section here, but if the | |
614 | // value is absolute, we set the symbol. This permits us to use | |
615 | // absolute symbols when setting dot. | |
616 | void | |
617 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
77e65537 ILT |
618 | uint64_t, uint64_t* dot_value, Output_section**, |
619 | std::string*, Input_section_list*) | |
a445fddf | 620 | { |
77e65537 | 621 | this->assignment_.set_if_absolute(symtab, layout, true, *dot_value); |
a445fddf ILT |
622 | } |
623 | ||
624 | // Print for debugging. | |
494e05f4 ILT |
625 | void |
626 | print(FILE* f) const | |
627 | { | |
628 | fprintf(f, " "); | |
629 | this->assignment_.print(f); | |
630 | } | |
631 | ||
632 | private: | |
633 | Symbol_assignment assignment_; | |
634 | }; | |
635 | ||
a445fddf ILT |
636 | // An assignment to the dot symbol in an output section. |
637 | ||
638 | class Output_section_element_dot_assignment : public Output_section_element | |
639 | { | |
640 | public: | |
641 | Output_section_element_dot_assignment(Expression* val) | |
642 | : val_(val) | |
643 | { } | |
644 | ||
645 | // Finalize the symbol. | |
646 | void | |
647 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 648 | uint64_t* dot_value, Output_section** dot_section) |
a445fddf | 649 | { |
919ed24c | 650 | *dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 | 651 | *dot_section, dot_section); |
a445fddf ILT |
652 | } |
653 | ||
654 | // Update the dot symbol while setting section addresses. | |
655 | void | |
656 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
77e65537 ILT |
657 | uint64_t, uint64_t* dot_value, Output_section**, |
658 | std::string*, Input_section_list*); | |
a445fddf ILT |
659 | |
660 | // Print for debugging. | |
661 | void | |
662 | print(FILE* f) const | |
663 | { | |
664 | fprintf(f, " . = "); | |
665 | this->val_->print(f); | |
666 | fprintf(f, "\n"); | |
667 | } | |
668 | ||
669 | private: | |
670 | Expression* val_; | |
671 | }; | |
672 | ||
673 | // Update the dot symbol while setting section addresses. | |
674 | ||
675 | void | |
676 | Output_section_element_dot_assignment::set_section_addresses( | |
677 | Symbol_table* symtab, | |
678 | Layout* layout, | |
679 | Output_section* output_section, | |
680 | uint64_t, | |
681 | uint64_t* dot_value, | |
77e65537 | 682 | Output_section** dot_section, |
a445fddf ILT |
683 | std::string* fill, |
684 | Input_section_list*) | |
685 | { | |
919ed24c ILT |
686 | uint64_t next_dot = this->val_->eval_with_dot(symtab, layout, false, |
687 | *dot_value, *dot_section, | |
688 | dot_section); | |
a445fddf ILT |
689 | if (next_dot < *dot_value) |
690 | gold_error(_("dot may not move backward")); | |
691 | if (next_dot > *dot_value && output_section != NULL) | |
692 | { | |
693 | section_size_type length = convert_to_section_size_type(next_dot | |
694 | - *dot_value); | |
695 | Output_section_data* posd; | |
696 | if (fill->empty()) | |
7d9e3d98 | 697 | posd = new Output_data_zero_fill(length, 0); |
a445fddf ILT |
698 | else |
699 | { | |
700 | std::string this_fill = this->get_fill_string(fill, length); | |
701 | posd = new Output_data_const(this_fill, 0); | |
702 | } | |
703 | output_section->add_output_section_data(posd); | |
704 | } | |
705 | *dot_value = next_dot; | |
706 | } | |
707 | ||
494e05f4 ILT |
708 | // An assertion in an output section. |
709 | ||
710 | class Output_section_element_assertion : public Output_section_element | |
711 | { | |
712 | public: | |
713 | Output_section_element_assertion(Expression* check, const char* message, | |
714 | size_t messagelen) | |
715 | : assertion_(check, message, messagelen) | |
716 | { } | |
717 | ||
718 | void | |
719 | print(FILE* f) const | |
720 | { | |
721 | fprintf(f, " "); | |
722 | this->assertion_.print(f); | |
723 | } | |
724 | ||
725 | private: | |
726 | Script_assertion assertion_; | |
727 | }; | |
728 | ||
77e65537 ILT |
729 | // We use a special instance of Output_section_data to handle BYTE, |
730 | // SHORT, etc. This permits forward references to symbols in the | |
731 | // expressions. | |
494e05f4 | 732 | |
77e65537 | 733 | class Output_data_expression : public Output_section_data |
494e05f4 ILT |
734 | { |
735 | public: | |
77e65537 ILT |
736 | Output_data_expression(int size, bool is_signed, Expression* val, |
737 | const Symbol_table* symtab, const Layout* layout, | |
738 | uint64_t dot_value, Output_section* dot_section) | |
739 | : Output_section_data(size, 0), | |
740 | is_signed_(is_signed), val_(val), symtab_(symtab), | |
741 | layout_(layout), dot_value_(dot_value), dot_section_(dot_section) | |
494e05f4 ILT |
742 | { } |
743 | ||
77e65537 ILT |
744 | protected: |
745 | // Write the data to the output file. | |
a445fddf | 746 | void |
77e65537 | 747 | do_write(Output_file*); |
a445fddf | 748 | |
77e65537 | 749 | // Write the data to a buffer. |
494e05f4 | 750 | void |
77e65537 | 751 | do_write_to_buffer(unsigned char*); |
494e05f4 | 752 | |
7d9e3d98 ILT |
753 | // Write to a map file. |
754 | void | |
755 | do_print_to_mapfile(Mapfile* mapfile) const | |
756 | { mapfile->print_output_data(this, _("** expression")); } | |
757 | ||
494e05f4 | 758 | private: |
a445fddf | 759 | template<bool big_endian> |
77e65537 ILT |
760 | void |
761 | endian_write_to_buffer(uint64_t, unsigned char*); | |
a445fddf | 762 | |
494e05f4 | 763 | bool is_signed_; |
494e05f4 | 764 | Expression* val_; |
77e65537 ILT |
765 | const Symbol_table* symtab_; |
766 | const Layout* layout_; | |
767 | uint64_t dot_value_; | |
768 | Output_section* dot_section_; | |
494e05f4 ILT |
769 | }; |
770 | ||
77e65537 | 771 | // Write the data element to the output file. |
a445fddf ILT |
772 | |
773 | void | |
77e65537 | 774 | Output_data_expression::do_write(Output_file* of) |
a445fddf | 775 | { |
77e65537 ILT |
776 | unsigned char* view = of->get_output_view(this->offset(), this->data_size()); |
777 | this->write_to_buffer(view); | |
778 | of->write_output_view(this->offset(), this->data_size(), view); | |
779 | } | |
a445fddf | 780 | |
77e65537 ILT |
781 | // Write the data element to a buffer. |
782 | ||
783 | void | |
784 | Output_data_expression::do_write_to_buffer(unsigned char* buf) | |
785 | { | |
786 | Output_section* dummy; | |
787 | uint64_t val = this->val_->eval_with_dot(this->symtab_, this->layout_, | |
919ed24c | 788 | true, this->dot_value_, |
77e65537 | 789 | this->dot_section_, &dummy); |
a445fddf | 790 | |
8851ecca | 791 | if (parameters->target().is_big_endian()) |
77e65537 | 792 | this->endian_write_to_buffer<true>(val, buf); |
a445fddf | 793 | else |
77e65537 | 794 | this->endian_write_to_buffer<false>(val, buf); |
a445fddf ILT |
795 | } |
796 | ||
a445fddf | 797 | template<bool big_endian> |
77e65537 ILT |
798 | void |
799 | Output_data_expression::endian_write_to_buffer(uint64_t val, | |
800 | unsigned char* buf) | |
a445fddf | 801 | { |
77e65537 | 802 | switch (this->data_size()) |
a445fddf ILT |
803 | { |
804 | case 1: | |
805 | elfcpp::Swap_unaligned<8, big_endian>::writeval(buf, val); | |
a445fddf ILT |
806 | break; |
807 | case 2: | |
808 | elfcpp::Swap_unaligned<16, big_endian>::writeval(buf, val); | |
a445fddf ILT |
809 | break; |
810 | case 4: | |
811 | elfcpp::Swap_unaligned<32, big_endian>::writeval(buf, val); | |
a445fddf ILT |
812 | break; |
813 | case 8: | |
8851ecca | 814 | if (parameters->target().get_size() == 32) |
a445fddf ILT |
815 | { |
816 | val &= 0xffffffff; | |
817 | if (this->is_signed_ && (val & 0x80000000) != 0) | |
818 | val |= 0xffffffff00000000LL; | |
819 | } | |
820 | elfcpp::Swap_unaligned<64, big_endian>::writeval(buf, val); | |
a445fddf ILT |
821 | break; |
822 | default: | |
823 | gold_unreachable(); | |
824 | } | |
77e65537 ILT |
825 | } |
826 | ||
827 | // A data item in an output section. | |
828 | ||
829 | class Output_section_element_data : public Output_section_element | |
830 | { | |
831 | public: | |
832 | Output_section_element_data(int size, bool is_signed, Expression* val) | |
833 | : size_(size), is_signed_(is_signed), val_(val) | |
834 | { } | |
835 | ||
919ed24c ILT |
836 | // If there is a data item, then we must create an output section. |
837 | bool | |
838 | needs_output_section() const | |
839 | { return true; } | |
840 | ||
77e65537 ILT |
841 | // Finalize symbols--we just need to update dot. |
842 | void | |
843 | finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value, | |
844 | Output_section**) | |
845 | { *dot_value += this->size_; } | |
846 | ||
847 | // Store the value in the section. | |
848 | void | |
849 | set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t, | |
850 | uint64_t* dot_value, Output_section**, std::string*, | |
851 | Input_section_list*); | |
852 | ||
853 | // Print for debugging. | |
854 | void | |
855 | print(FILE*) const; | |
856 | ||
857 | private: | |
858 | // The size in bytes. | |
859 | int size_; | |
860 | // Whether the value is signed. | |
861 | bool is_signed_; | |
862 | // The value. | |
863 | Expression* val_; | |
864 | }; | |
865 | ||
866 | // Store the value in the section. | |
867 | ||
868 | void | |
869 | Output_section_element_data::set_section_addresses( | |
870 | Symbol_table* symtab, | |
871 | Layout* layout, | |
872 | Output_section* os, | |
873 | uint64_t, | |
874 | uint64_t* dot_value, | |
875 | Output_section** dot_section, | |
876 | std::string*, | |
877 | Input_section_list*) | |
878 | { | |
879 | gold_assert(os != NULL); | |
880 | os->add_output_section_data(new Output_data_expression(this->size_, | |
881 | this->is_signed_, | |
882 | this->val_, | |
883 | symtab, | |
884 | layout, | |
885 | *dot_value, | |
886 | *dot_section)); | |
887 | *dot_value += this->size_; | |
a445fddf ILT |
888 | } |
889 | ||
494e05f4 ILT |
890 | // Print for debugging. |
891 | ||
892 | void | |
893 | Output_section_element_data::print(FILE* f) const | |
894 | { | |
895 | const char* s; | |
896 | switch (this->size_) | |
897 | { | |
898 | case 1: | |
899 | s = "BYTE"; | |
900 | break; | |
901 | case 2: | |
902 | s = "SHORT"; | |
903 | break; | |
904 | case 4: | |
905 | s = "LONG"; | |
906 | break; | |
907 | case 8: | |
908 | if (this->is_signed_) | |
909 | s = "SQUAD"; | |
910 | else | |
911 | s = "QUAD"; | |
912 | break; | |
913 | default: | |
914 | gold_unreachable(); | |
915 | } | |
916 | fprintf(f, " %s(", s); | |
917 | this->val_->print(f); | |
918 | fprintf(f, ")\n"); | |
919 | } | |
920 | ||
921 | // A fill value setting in an output section. | |
922 | ||
923 | class Output_section_element_fill : public Output_section_element | |
924 | { | |
925 | public: | |
926 | Output_section_element_fill(Expression* val) | |
927 | : val_(val) | |
928 | { } | |
929 | ||
a445fddf ILT |
930 | // Update the fill value while setting section addresses. |
931 | void | |
932 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
77e65537 ILT |
933 | uint64_t, uint64_t* dot_value, |
934 | Output_section** dot_section, | |
935 | std::string* fill, Input_section_list*) | |
a445fddf | 936 | { |
77e65537 | 937 | Output_section* fill_section; |
919ed24c | 938 | uint64_t fill_val = this->val_->eval_with_dot(symtab, layout, false, |
77e65537 ILT |
939 | *dot_value, *dot_section, |
940 | &fill_section); | |
941 | if (fill_section != NULL) | |
942 | gold_warning(_("fill value is not absolute")); | |
a445fddf ILT |
943 | // FIXME: The GNU linker supports fill values of arbitrary length. |
944 | unsigned char fill_buff[4]; | |
945 | elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val); | |
946 | fill->assign(reinterpret_cast<char*>(fill_buff), 4); | |
947 | } | |
948 | ||
949 | // Print for debugging. | |
494e05f4 ILT |
950 | void |
951 | print(FILE* f) const | |
952 | { | |
953 | fprintf(f, " FILL("); | |
954 | this->val_->print(f); | |
955 | fprintf(f, ")\n"); | |
956 | } | |
957 | ||
958 | private: | |
959 | // The new fill value. | |
960 | Expression* val_; | |
961 | }; | |
962 | ||
a445fddf ILT |
963 | // Return whether STRING contains a wildcard character. This is used |
964 | // to speed up matching. | |
965 | ||
966 | static inline bool | |
967 | is_wildcard_string(const std::string& s) | |
968 | { | |
969 | return strpbrk(s.c_str(), "?*[") != NULL; | |
970 | } | |
971 | ||
494e05f4 ILT |
972 | // An input section specification in an output section |
973 | ||
974 | class Output_section_element_input : public Output_section_element | |
975 | { | |
976 | public: | |
494e05f4 ILT |
977 | Output_section_element_input(const Input_section_spec* spec, bool keep); |
978 | ||
a445fddf ILT |
979 | // Finalize symbols--just update the value of the dot symbol. |
980 | void | |
77e65537 ILT |
981 | finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value, |
982 | Output_section** dot_section) | |
a445fddf ILT |
983 | { |
984 | *dot_value = this->final_dot_value_; | |
77e65537 | 985 | *dot_section = this->final_dot_section_; |
a445fddf ILT |
986 | } |
987 | ||
988 | // See whether we match FILE_NAME and SECTION_NAME as an input | |
989 | // section. | |
990 | bool | |
991 | match_name(const char* file_name, const char* section_name) const; | |
992 | ||
993 | // Set the section address. | |
994 | void | |
995 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
996 | uint64_t subalign, uint64_t* dot_value, | |
77e65537 ILT |
997 | Output_section**, std::string* fill, |
998 | Input_section_list*); | |
a445fddf ILT |
999 | |
1000 | // Print for debugging. | |
494e05f4 ILT |
1001 | void |
1002 | print(FILE* f) const; | |
1003 | ||
1004 | private: | |
1005 | // An input section pattern. | |
1006 | struct Input_section_pattern | |
1007 | { | |
1008 | std::string pattern; | |
a445fddf | 1009 | bool pattern_is_wildcard; |
494e05f4 ILT |
1010 | Sort_wildcard sort; |
1011 | ||
1012 | Input_section_pattern(const char* patterna, size_t patternlena, | |
1013 | Sort_wildcard sorta) | |
a445fddf ILT |
1014 | : pattern(patterna, patternlena), |
1015 | pattern_is_wildcard(is_wildcard_string(this->pattern)), | |
1016 | sort(sorta) | |
494e05f4 ILT |
1017 | { } |
1018 | }; | |
1019 | ||
1020 | typedef std::vector<Input_section_pattern> Input_section_patterns; | |
1021 | ||
a445fddf ILT |
1022 | // Filename_exclusions is a pair of filename pattern and a bool |
1023 | // indicating whether the filename is a wildcard. | |
1024 | typedef std::vector<std::pair<std::string, bool> > Filename_exclusions; | |
1025 | ||
1026 | // Return whether STRING matches PATTERN, where IS_WILDCARD_PATTERN | |
1027 | // indicates whether this is a wildcard pattern. | |
1028 | static inline bool | |
1029 | match(const char* string, const char* pattern, bool is_wildcard_pattern) | |
1030 | { | |
1031 | return (is_wildcard_pattern | |
1032 | ? fnmatch(pattern, string, 0) == 0 | |
1033 | : strcmp(string, pattern) == 0); | |
1034 | } | |
494e05f4 | 1035 | |
a445fddf ILT |
1036 | // See if we match a file name. |
1037 | bool | |
1038 | match_file_name(const char* file_name) const; | |
1039 | ||
1040 | // The file name pattern. If this is the empty string, we match all | |
1041 | // files. | |
494e05f4 | 1042 | std::string filename_pattern_; |
a445fddf ILT |
1043 | // Whether the file name pattern is a wildcard. |
1044 | bool filename_is_wildcard_; | |
494e05f4 ILT |
1045 | // How the file names should be sorted. This may only be |
1046 | // SORT_WILDCARD_NONE or SORT_WILDCARD_BY_NAME. | |
1047 | Sort_wildcard filename_sort_; | |
1048 | // The list of file names to exclude. | |
1049 | Filename_exclusions filename_exclusions_; | |
1050 | // The list of input section patterns. | |
1051 | Input_section_patterns input_section_patterns_; | |
1052 | // Whether to keep this section when garbage collecting. | |
1053 | bool keep_; | |
a445fddf ILT |
1054 | // The value of dot after including all matching sections. |
1055 | uint64_t final_dot_value_; | |
77e65537 ILT |
1056 | // The section where dot is defined after including all matching |
1057 | // sections. | |
1058 | Output_section* final_dot_section_; | |
494e05f4 ILT |
1059 | }; |
1060 | ||
1061 | // Construct Output_section_element_input. The parser records strings | |
1062 | // as pointers into a copy of the script file, which will go away when | |
1063 | // parsing is complete. We make sure they are in std::string objects. | |
1064 | ||
1065 | Output_section_element_input::Output_section_element_input( | |
1066 | const Input_section_spec* spec, | |
1067 | bool keep) | |
a445fddf ILT |
1068 | : filename_pattern_(), |
1069 | filename_is_wildcard_(false), | |
494e05f4 ILT |
1070 | filename_sort_(spec->file.sort), |
1071 | filename_exclusions_(), | |
1072 | input_section_patterns_(), | |
a445fddf | 1073 | keep_(keep), |
77e65537 ILT |
1074 | final_dot_value_(0), |
1075 | final_dot_section_(NULL) | |
494e05f4 | 1076 | { |
a445fddf ILT |
1077 | // The filename pattern "*" is common, and matches all files. Turn |
1078 | // it into the empty string. | |
1079 | if (spec->file.name.length != 1 || spec->file.name.value[0] != '*') | |
1080 | this->filename_pattern_.assign(spec->file.name.value, | |
1081 | spec->file.name.length); | |
1082 | this->filename_is_wildcard_ = is_wildcard_string(this->filename_pattern_); | |
1083 | ||
494e05f4 ILT |
1084 | if (spec->input_sections.exclude != NULL) |
1085 | { | |
1086 | for (String_list::const_iterator p = | |
1087 | spec->input_sections.exclude->begin(); | |
1088 | p != spec->input_sections.exclude->end(); | |
1089 | ++p) | |
a445fddf ILT |
1090 | { |
1091 | bool is_wildcard = is_wildcard_string(*p); | |
1092 | this->filename_exclusions_.push_back(std::make_pair(*p, | |
1093 | is_wildcard)); | |
1094 | } | |
494e05f4 ILT |
1095 | } |
1096 | ||
1097 | if (spec->input_sections.sections != NULL) | |
1098 | { | |
1099 | Input_section_patterns& isp(this->input_section_patterns_); | |
1100 | for (String_sort_list::const_iterator p = | |
1101 | spec->input_sections.sections->begin(); | |
1102 | p != spec->input_sections.sections->end(); | |
1103 | ++p) | |
1104 | isp.push_back(Input_section_pattern(p->name.value, p->name.length, | |
1105 | p->sort)); | |
1106 | } | |
1107 | } | |
1108 | ||
a445fddf ILT |
1109 | // See whether we match FILE_NAME. |
1110 | ||
1111 | bool | |
1112 | Output_section_element_input::match_file_name(const char* file_name) const | |
1113 | { | |
1114 | if (!this->filename_pattern_.empty()) | |
1115 | { | |
1116 | // If we were called with no filename, we refuse to match a | |
1117 | // pattern which requires a file name. | |
1118 | if (file_name == NULL) | |
1119 | return false; | |
1120 | ||
1121 | if (!match(file_name, this->filename_pattern_.c_str(), | |
1122 | this->filename_is_wildcard_)) | |
1123 | return false; | |
1124 | } | |
1125 | ||
1126 | if (file_name != NULL) | |
1127 | { | |
1128 | // Now we have to see whether FILE_NAME matches one of the | |
1129 | // exclusion patterns, if any. | |
1130 | for (Filename_exclusions::const_iterator p = | |
1131 | this->filename_exclusions_.begin(); | |
1132 | p != this->filename_exclusions_.end(); | |
1133 | ++p) | |
1134 | { | |
1135 | if (match(file_name, p->first.c_str(), p->second)) | |
1136 | return false; | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | return true; | |
1141 | } | |
1142 | ||
1143 | // See whether we match FILE_NAME and SECTION_NAME. | |
1144 | ||
1145 | bool | |
1146 | Output_section_element_input::match_name(const char* file_name, | |
1147 | const char* section_name) const | |
1148 | { | |
1149 | if (!this->match_file_name(file_name)) | |
1150 | return false; | |
1151 | ||
1152 | // If there are no section name patterns, then we match. | |
1153 | if (this->input_section_patterns_.empty()) | |
1154 | return true; | |
1155 | ||
1156 | // See whether we match the section name patterns. | |
1157 | for (Input_section_patterns::const_iterator p = | |
1158 | this->input_section_patterns_.begin(); | |
1159 | p != this->input_section_patterns_.end(); | |
1160 | ++p) | |
1161 | { | |
1162 | if (match(section_name, p->pattern.c_str(), p->pattern_is_wildcard)) | |
1163 | return true; | |
1164 | } | |
1165 | ||
1166 | // We didn't match any section names, so we didn't match. | |
1167 | return false; | |
1168 | } | |
1169 | ||
1170 | // Information we use to sort the input sections. | |
1171 | ||
1172 | struct Input_section_info | |
1173 | { | |
1174 | Relobj* relobj; | |
1175 | unsigned int shndx; | |
1176 | std::string section_name; | |
1177 | uint64_t size; | |
1178 | uint64_t addralign; | |
1179 | }; | |
1180 | ||
1181 | // A class to sort the input sections. | |
1182 | ||
1183 | class Input_section_sorter | |
1184 | { | |
1185 | public: | |
1186 | Input_section_sorter(Sort_wildcard filename_sort, Sort_wildcard section_sort) | |
1187 | : filename_sort_(filename_sort), section_sort_(section_sort) | |
1188 | { } | |
1189 | ||
1190 | bool | |
1191 | operator()(const Input_section_info&, const Input_section_info&) const; | |
1192 | ||
1193 | private: | |
1194 | Sort_wildcard filename_sort_; | |
1195 | Sort_wildcard section_sort_; | |
1196 | }; | |
1197 | ||
1198 | bool | |
1199 | Input_section_sorter::operator()(const Input_section_info& isi1, | |
1200 | const Input_section_info& isi2) const | |
1201 | { | |
1202 | if (this->section_sort_ == SORT_WILDCARD_BY_NAME | |
1203 | || this->section_sort_ == SORT_WILDCARD_BY_NAME_BY_ALIGNMENT | |
1204 | || (this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT_BY_NAME | |
1205 | && isi1.addralign == isi2.addralign)) | |
1206 | { | |
1207 | if (isi1.section_name != isi2.section_name) | |
1208 | return isi1.section_name < isi2.section_name; | |
1209 | } | |
1210 | if (this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT | |
1211 | || this->section_sort_ == SORT_WILDCARD_BY_NAME_BY_ALIGNMENT | |
1212 | || this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT_BY_NAME) | |
1213 | { | |
1214 | if (isi1.addralign != isi2.addralign) | |
1215 | return isi1.addralign < isi2.addralign; | |
1216 | } | |
1217 | if (this->filename_sort_ == SORT_WILDCARD_BY_NAME) | |
1218 | { | |
1219 | if (isi1.relobj->name() != isi2.relobj->name()) | |
1220 | return isi1.relobj->name() < isi2.relobj->name(); | |
1221 | } | |
1222 | ||
1223 | // Otherwise we leave them in the same order. | |
1224 | return false; | |
1225 | } | |
1226 | ||
1227 | // Set the section address. Look in INPUT_SECTIONS for sections which | |
1228 | // match this spec, sort them as specified, and add them to the output | |
1229 | // section. | |
1230 | ||
1231 | void | |
1232 | Output_section_element_input::set_section_addresses( | |
1233 | Symbol_table*, | |
1234 | Layout*, | |
1235 | Output_section* output_section, | |
1236 | uint64_t subalign, | |
1237 | uint64_t* dot_value, | |
77e65537 | 1238 | Output_section** dot_section, |
a445fddf ILT |
1239 | std::string* fill, |
1240 | Input_section_list* input_sections) | |
1241 | { | |
1242 | // We build a list of sections which match each | |
1243 | // Input_section_pattern. | |
1244 | ||
1245 | typedef std::vector<std::vector<Input_section_info> > Matching_sections; | |
1246 | size_t input_pattern_count = this->input_section_patterns_.size(); | |
1247 | if (input_pattern_count == 0) | |
1248 | input_pattern_count = 1; | |
1249 | Matching_sections matching_sections(input_pattern_count); | |
1250 | ||
1251 | // Look through the list of sections for this output section. Add | |
1252 | // each one which matches to one of the elements of | |
1253 | // MATCHING_SECTIONS. | |
1254 | ||
1255 | Input_section_list::iterator p = input_sections->begin(); | |
1256 | while (p != input_sections->end()) | |
1257 | { | |
1258 | // Calling section_name and section_addralign is not very | |
1259 | // efficient. | |
1260 | Input_section_info isi; | |
1261 | isi.relobj = p->first; | |
1262 | isi.shndx = p->second; | |
1263 | ||
1264 | // Lock the object so that we can get information about the | |
1265 | // section. This is OK since we know we are single-threaded | |
1266 | // here. | |
1267 | { | |
1268 | const Task* task = reinterpret_cast<const Task*>(-1); | |
1269 | Task_lock_obj<Object> tl(task, p->first); | |
1270 | ||
1271 | isi.section_name = p->first->section_name(p->second); | |
1272 | isi.size = p->first->section_size(p->second); | |
1273 | isi.addralign = p->first->section_addralign(p->second); | |
1274 | } | |
1275 | ||
1276 | if (!this->match_file_name(isi.relobj->name().c_str())) | |
1277 | ++p; | |
1278 | else if (this->input_section_patterns_.empty()) | |
1279 | { | |
1280 | matching_sections[0].push_back(isi); | |
1281 | p = input_sections->erase(p); | |
1282 | } | |
1283 | else | |
1284 | { | |
1285 | size_t i; | |
1286 | for (i = 0; i < input_pattern_count; ++i) | |
1287 | { | |
1288 | const Input_section_pattern& | |
1289 | isp(this->input_section_patterns_[i]); | |
1290 | if (match(isi.section_name.c_str(), isp.pattern.c_str(), | |
1291 | isp.pattern_is_wildcard)) | |
1292 | break; | |
1293 | } | |
1294 | ||
1295 | if (i >= this->input_section_patterns_.size()) | |
1296 | ++p; | |
1297 | else | |
1298 | { | |
1299 | matching_sections[i].push_back(isi); | |
1300 | p = input_sections->erase(p); | |
1301 | } | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | // Look through MATCHING_SECTIONS. Sort each one as specified, | |
1306 | // using a stable sort so that we get the default order when | |
1307 | // sections are otherwise equal. Add each input section to the | |
1308 | // output section. | |
1309 | ||
1310 | for (size_t i = 0; i < input_pattern_count; ++i) | |
1311 | { | |
1312 | if (matching_sections[i].empty()) | |
1313 | continue; | |
1314 | ||
1315 | gold_assert(output_section != NULL); | |
1316 | ||
1317 | const Input_section_pattern& isp(this->input_section_patterns_[i]); | |
1318 | if (isp.sort != SORT_WILDCARD_NONE | |
1319 | || this->filename_sort_ != SORT_WILDCARD_NONE) | |
1320 | std::stable_sort(matching_sections[i].begin(), | |
1321 | matching_sections[i].end(), | |
1322 | Input_section_sorter(this->filename_sort_, | |
1323 | isp.sort)); | |
1324 | ||
1325 | for (std::vector<Input_section_info>::const_iterator p = | |
1326 | matching_sections[i].begin(); | |
1327 | p != matching_sections[i].end(); | |
1328 | ++p) | |
1329 | { | |
1330 | uint64_t this_subalign = p->addralign; | |
1331 | if (this_subalign < subalign) | |
1332 | this_subalign = subalign; | |
1333 | ||
1334 | uint64_t address = align_address(*dot_value, this_subalign); | |
1335 | ||
1336 | if (address > *dot_value && !fill->empty()) | |
1337 | { | |
1338 | section_size_type length = | |
1339 | convert_to_section_size_type(address - *dot_value); | |
1340 | std::string this_fill = this->get_fill_string(fill, length); | |
1341 | Output_section_data* posd = new Output_data_const(this_fill, 0); | |
1342 | output_section->add_output_section_data(posd); | |
1343 | } | |
1344 | ||
1345 | output_section->add_input_section_for_script(p->relobj, | |
1346 | p->shndx, | |
1347 | p->size, | |
1348 | this_subalign); | |
1349 | ||
1350 | *dot_value = address + p->size; | |
1351 | } | |
1352 | } | |
1353 | ||
1354 | this->final_dot_value_ = *dot_value; | |
77e65537 | 1355 | this->final_dot_section_ = *dot_section; |
a445fddf ILT |
1356 | } |
1357 | ||
494e05f4 ILT |
1358 | // Print for debugging. |
1359 | ||
1360 | void | |
1361 | Output_section_element_input::print(FILE* f) const | |
1362 | { | |
1363 | fprintf(f, " "); | |
1364 | ||
1365 | if (this->keep_) | |
1366 | fprintf(f, "KEEP("); | |
1367 | ||
1368 | if (!this->filename_pattern_.empty()) | |
1369 | { | |
1370 | bool need_close_paren = false; | |
1371 | switch (this->filename_sort_) | |
1372 | { | |
1373 | case SORT_WILDCARD_NONE: | |
1374 | break; | |
1375 | case SORT_WILDCARD_BY_NAME: | |
1376 | fprintf(f, "SORT_BY_NAME("); | |
1377 | need_close_paren = true; | |
1378 | break; | |
1379 | default: | |
1380 | gold_unreachable(); | |
1381 | } | |
1382 | ||
1383 | fprintf(f, "%s", this->filename_pattern_.c_str()); | |
1384 | ||
1385 | if (need_close_paren) | |
1386 | fprintf(f, ")"); | |
1387 | } | |
1388 | ||
1389 | if (!this->input_section_patterns_.empty() | |
1390 | || !this->filename_exclusions_.empty()) | |
1391 | { | |
1392 | fprintf(f, "("); | |
1393 | ||
1394 | bool need_space = false; | |
1395 | if (!this->filename_exclusions_.empty()) | |
1396 | { | |
1397 | fprintf(f, "EXCLUDE_FILE("); | |
1398 | bool need_comma = false; | |
1399 | for (Filename_exclusions::const_iterator p = | |
1400 | this->filename_exclusions_.begin(); | |
1401 | p != this->filename_exclusions_.end(); | |
1402 | ++p) | |
1403 | { | |
1404 | if (need_comma) | |
1405 | fprintf(f, ", "); | |
a445fddf | 1406 | fprintf(f, "%s", p->first.c_str()); |
494e05f4 ILT |
1407 | need_comma = true; |
1408 | } | |
1409 | fprintf(f, ")"); | |
1410 | need_space = true; | |
1411 | } | |
1412 | ||
1413 | for (Input_section_patterns::const_iterator p = | |
1414 | this->input_section_patterns_.begin(); | |
1415 | p != this->input_section_patterns_.end(); | |
1416 | ++p) | |
1417 | { | |
1418 | if (need_space) | |
1419 | fprintf(f, " "); | |
1420 | ||
1421 | int close_parens = 0; | |
1422 | switch (p->sort) | |
1423 | { | |
1424 | case SORT_WILDCARD_NONE: | |
1425 | break; | |
1426 | case SORT_WILDCARD_BY_NAME: | |
1427 | fprintf(f, "SORT_BY_NAME("); | |
1428 | close_parens = 1; | |
1429 | break; | |
1430 | case SORT_WILDCARD_BY_ALIGNMENT: | |
1431 | fprintf(f, "SORT_BY_ALIGNMENT("); | |
1432 | close_parens = 1; | |
1433 | break; | |
1434 | case SORT_WILDCARD_BY_NAME_BY_ALIGNMENT: | |
1435 | fprintf(f, "SORT_BY_NAME(SORT_BY_ALIGNMENT("); | |
1436 | close_parens = 2; | |
1437 | break; | |
1438 | case SORT_WILDCARD_BY_ALIGNMENT_BY_NAME: | |
1439 | fprintf(f, "SORT_BY_ALIGNMENT(SORT_BY_NAME("); | |
1440 | close_parens = 2; | |
1441 | break; | |
1442 | default: | |
1443 | gold_unreachable(); | |
1444 | } | |
1445 | ||
1446 | fprintf(f, "%s", p->pattern.c_str()); | |
1447 | ||
1448 | for (int i = 0; i < close_parens; ++i) | |
1449 | fprintf(f, ")"); | |
1450 | ||
1451 | need_space = true; | |
1452 | } | |
1453 | ||
1454 | fprintf(f, ")"); | |
1455 | } | |
1456 | ||
1457 | if (this->keep_) | |
1458 | fprintf(f, ")"); | |
1459 | ||
1460 | fprintf(f, "\n"); | |
1461 | } | |
1462 | ||
1463 | // An output section. | |
1464 | ||
1465 | class Output_section_definition : public Sections_element | |
1466 | { | |
1467 | public: | |
a445fddf ILT |
1468 | typedef Output_section_element::Input_section_list Input_section_list; |
1469 | ||
494e05f4 ILT |
1470 | Output_section_definition(const char* name, size_t namelen, |
1471 | const Parser_output_section_header* header); | |
1472 | ||
1473 | // Finish the output section with the information in the trailer. | |
1474 | void | |
1475 | finish(const Parser_output_section_trailer* trailer); | |
1476 | ||
1477 | // Add a symbol to be defined. | |
1478 | void | |
1479 | add_symbol_assignment(const char* name, size_t length, Expression* value, | |
1480 | bool provide, bool hidden); | |
a445fddf ILT |
1481 | |
1482 | // Add an assignment to the special dot symbol. | |
1483 | void | |
1484 | add_dot_assignment(Expression* value); | |
1485 | ||
494e05f4 ILT |
1486 | // Add an assertion. |
1487 | void | |
1488 | add_assertion(Expression* check, const char* message, size_t messagelen); | |
1489 | ||
1490 | // Add a data item to the current output section. | |
1491 | void | |
1492 | add_data(int size, bool is_signed, Expression* val); | |
1493 | ||
1494 | // Add a setting for the fill value. | |
1495 | void | |
1496 | add_fill(Expression* val); | |
1497 | ||
1498 | // Add an input section specification. | |
1499 | void | |
1500 | add_input_section(const Input_section_spec* spec, bool keep); | |
1501 | ||
0d371ad3 ILT |
1502 | // Return whether the output section is relro. |
1503 | bool | |
1504 | is_relro() const | |
1505 | { return this->is_relro_; } | |
1506 | ||
2d924fd9 ILT |
1507 | // Record that the output section is relro. |
1508 | void | |
1509 | set_is_relro() | |
1510 | { this->is_relro_ = true; } | |
1511 | ||
919ed24c ILT |
1512 | // Create any required output sections. |
1513 | void | |
1514 | create_sections(Layout*); | |
1515 | ||
a445fddf ILT |
1516 | // Add any symbols being defined to the symbol table. |
1517 | void | |
1518 | add_symbols_to_table(Symbol_table* symtab); | |
1519 | ||
1520 | // Finalize symbols and check assertions. | |
1521 | void | |
77e65537 | 1522 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*); |
a445fddf ILT |
1523 | |
1524 | // Return the output section name to use for an input file name and | |
1525 | // section name. | |
1526 | const char* | |
1527 | output_section_name(const char* file_name, const char* section_name, | |
1528 | Output_section***); | |
1529 | ||
0d371ad3 ILT |
1530 | // Initialize OSP with an output section. |
1531 | void | |
1532 | orphan_section_init(Orphan_section_placement* osp, | |
1533 | Script_sections::Elements_iterator p) | |
1534 | { osp->output_section_init(this->name_, this->output_section_, p); } | |
a445fddf ILT |
1535 | |
1536 | // Set the section address. | |
1537 | void | |
1538 | set_section_addresses(Symbol_table* symtab, Layout* layout, | |
fd247bfe | 1539 | uint64_t* dot_value, uint64_t* load_address); |
a445fddf | 1540 | |
3802b2dd ILT |
1541 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
1542 | // this section is constrained, and the input sections do not match, | |
1543 | // return the constraint, and set *POSD. | |
1544 | Section_constraint | |
1545 | check_constraint(Output_section_definition** posd); | |
1546 | ||
1547 | // See if this is the alternate output section for a constrained | |
1548 | // output section. If it is, transfer the Output_section and return | |
1549 | // true. Otherwise return false. | |
1550 | bool | |
1551 | alternate_constraint(Output_section_definition*, Section_constraint); | |
1552 | ||
1c4f3631 | 1553 | // Get the list of segments to use for an allocated section when |
2cefc357 | 1554 | // using a PHDRS clause. |
1c4f3631 | 1555 | Output_section* |
2cefc357 | 1556 | allocate_to_segment(String_list** phdrs_list, bool* orphan); |
1c4f3631 | 1557 | |
8f2eb564 ILT |
1558 | // Look for an output section by name and return the address, the |
1559 | // load address, the alignment, and the size. This is used when an | |
1560 | // expression refers to an output section which was not actually | |
1561 | // created. This returns true if the section was found, false | |
1562 | // otherwise. | |
1563 | bool | |
1564 | get_output_section_info(const char*, uint64_t*, uint64_t*, uint64_t*, | |
1565 | uint64_t*) const; | |
1566 | ||
2d924fd9 ILT |
1567 | // Return the associated Output_section if there is one. |
1568 | Output_section* | |
1569 | get_output_section() const | |
1570 | { return this->output_section_; } | |
1571 | ||
494e05f4 ILT |
1572 | // Print the contents to the FILE. This is for debugging. |
1573 | void | |
1574 | print(FILE*) const; | |
1575 | ||
1576 | private: | |
1577 | typedef std::vector<Output_section_element*> Output_section_elements; | |
1578 | ||
1579 | // The output section name. | |
1580 | std::string name_; | |
1581 | // The address. This may be NULL. | |
1582 | Expression* address_; | |
1583 | // The load address. This may be NULL. | |
1584 | Expression* load_address_; | |
1585 | // The alignment. This may be NULL. | |
1586 | Expression* align_; | |
1587 | // The input section alignment. This may be NULL. | |
1588 | Expression* subalign_; | |
3802b2dd ILT |
1589 | // The constraint, if any. |
1590 | Section_constraint constraint_; | |
494e05f4 ILT |
1591 | // The fill value. This may be NULL. |
1592 | Expression* fill_; | |
1c4f3631 ILT |
1593 | // The list of segments this section should go into. This may be |
1594 | // NULL. | |
1595 | String_list* phdrs_; | |
494e05f4 ILT |
1596 | // The list of elements defining the section. |
1597 | Output_section_elements elements_; | |
a445fddf ILT |
1598 | // The Output_section created for this definition. This will be |
1599 | // NULL if none was created. | |
1600 | Output_section* output_section_; | |
8f2eb564 ILT |
1601 | // The address after it has been evaluated. |
1602 | uint64_t evaluated_address_; | |
1603 | // The load address after it has been evaluated. | |
1604 | uint64_t evaluated_load_address_; | |
1605 | // The alignment after it has been evaluated. | |
1606 | uint64_t evaluated_addralign_; | |
2d924fd9 ILT |
1607 | // The output section is relro. |
1608 | bool is_relro_; | |
494e05f4 ILT |
1609 | }; |
1610 | ||
1611 | // Constructor. | |
1612 | ||
1613 | Output_section_definition::Output_section_definition( | |
1614 | const char* name, | |
1615 | size_t namelen, | |
1616 | const Parser_output_section_header* header) | |
1617 | : name_(name, namelen), | |
1618 | address_(header->address), | |
1619 | load_address_(header->load_address), | |
1620 | align_(header->align), | |
1621 | subalign_(header->subalign), | |
3802b2dd | 1622 | constraint_(header->constraint), |
494e05f4 | 1623 | fill_(NULL), |
1c4f3631 | 1624 | phdrs_(NULL), |
a445fddf | 1625 | elements_(), |
2d924fd9 ILT |
1626 | output_section_(NULL), |
1627 | evaluated_address_(0), | |
1628 | evaluated_load_address_(0), | |
1629 | evaluated_addralign_(0), | |
1630 | is_relro_(false) | |
494e05f4 ILT |
1631 | { |
1632 | } | |
1633 | ||
1634 | // Finish an output section. | |
1635 | ||
1636 | void | |
1637 | Output_section_definition::finish(const Parser_output_section_trailer* trailer) | |
1638 | { | |
1639 | this->fill_ = trailer->fill; | |
1c4f3631 | 1640 | this->phdrs_ = trailer->phdrs; |
494e05f4 ILT |
1641 | } |
1642 | ||
1643 | // Add a symbol to be defined. | |
1644 | ||
1645 | void | |
1646 | Output_section_definition::add_symbol_assignment(const char* name, | |
1647 | size_t length, | |
1648 | Expression* value, | |
1649 | bool provide, | |
1650 | bool hidden) | |
1651 | { | |
1652 | Output_section_element* p = new Output_section_element_assignment(name, | |
1653 | length, | |
1654 | value, | |
1655 | provide, | |
1656 | hidden); | |
1657 | this->elements_.push_back(p); | |
1658 | } | |
1659 | ||
a445fddf | 1660 | // Add an assignment to the special dot symbol. |
494e05f4 ILT |
1661 | |
1662 | void | |
a445fddf ILT |
1663 | Output_section_definition::add_dot_assignment(Expression* value) |
1664 | { | |
1665 | Output_section_element* p = new Output_section_element_dot_assignment(value); | |
1666 | this->elements_.push_back(p); | |
1667 | } | |
1668 | ||
1669 | // Add an assertion. | |
1670 | ||
1671 | void | |
1672 | Output_section_definition::add_assertion(Expression* check, | |
1673 | const char* message, | |
494e05f4 ILT |
1674 | size_t messagelen) |
1675 | { | |
1676 | Output_section_element* p = new Output_section_element_assertion(check, | |
1677 | message, | |
1678 | messagelen); | |
1679 | this->elements_.push_back(p); | |
1680 | } | |
1681 | ||
1682 | // Add a data item to the current output section. | |
1683 | ||
1684 | void | |
1685 | Output_section_definition::add_data(int size, bool is_signed, Expression* val) | |
1686 | { | |
1687 | Output_section_element* p = new Output_section_element_data(size, is_signed, | |
1688 | val); | |
1689 | this->elements_.push_back(p); | |
1690 | } | |
1691 | ||
1692 | // Add a setting for the fill value. | |
1693 | ||
1694 | void | |
1695 | Output_section_definition::add_fill(Expression* val) | |
1696 | { | |
1697 | Output_section_element* p = new Output_section_element_fill(val); | |
1698 | this->elements_.push_back(p); | |
1699 | } | |
1700 | ||
1701 | // Add an input section specification. | |
1702 | ||
1703 | void | |
1704 | Output_section_definition::add_input_section(const Input_section_spec* spec, | |
1705 | bool keep) | |
1706 | { | |
1707 | Output_section_element* p = new Output_section_element_input(spec, keep); | |
1708 | this->elements_.push_back(p); | |
1709 | } | |
1710 | ||
919ed24c ILT |
1711 | // Create any required output sections. We need an output section if |
1712 | // there is a data statement here. | |
1713 | ||
1714 | void | |
1715 | Output_section_definition::create_sections(Layout* layout) | |
1716 | { | |
1717 | if (this->output_section_ != NULL) | |
1718 | return; | |
1719 | for (Output_section_elements::const_iterator p = this->elements_.begin(); | |
1720 | p != this->elements_.end(); | |
1721 | ++p) | |
1722 | { | |
1723 | if ((*p)->needs_output_section()) | |
1724 | { | |
1725 | const char* name = this->name_.c_str(); | |
1726 | this->output_section_ = layout->make_output_section_for_script(name); | |
1727 | return; | |
1728 | } | |
1729 | } | |
1730 | } | |
1731 | ||
a445fddf ILT |
1732 | // Add any symbols being defined to the symbol table. |
1733 | ||
1734 | void | |
1735 | Output_section_definition::add_symbols_to_table(Symbol_table* symtab) | |
1736 | { | |
1737 | for (Output_section_elements::iterator p = this->elements_.begin(); | |
1738 | p != this->elements_.end(); | |
1739 | ++p) | |
1740 | (*p)->add_symbols_to_table(symtab); | |
1741 | } | |
1742 | ||
1743 | // Finalize symbols and check assertions. | |
1744 | ||
1745 | void | |
1746 | Output_section_definition::finalize_symbols(Symbol_table* symtab, | |
1747 | const Layout* layout, | |
a445fddf ILT |
1748 | uint64_t* dot_value) |
1749 | { | |
1750 | if (this->output_section_ != NULL) | |
1751 | *dot_value = this->output_section_->address(); | |
1752 | else | |
1753 | { | |
1754 | uint64_t address = *dot_value; | |
1755 | if (this->address_ != NULL) | |
1756 | { | |
77e65537 | 1757 | Output_section* dummy; |
919ed24c | 1758 | address = this->address_->eval_with_dot(symtab, layout, true, |
77e65537 | 1759 | *dot_value, NULL, |
a445fddf ILT |
1760 | &dummy); |
1761 | } | |
1762 | if (this->align_ != NULL) | |
1763 | { | |
77e65537 | 1764 | Output_section* dummy; |
919ed24c | 1765 | uint64_t align = this->align_->eval_with_dot(symtab, layout, true, |
a445fddf | 1766 | *dot_value, |
77e65537 | 1767 | NULL, |
a445fddf ILT |
1768 | &dummy); |
1769 | address = align_address(address, align); | |
1770 | } | |
1771 | *dot_value = address; | |
1772 | } | |
a445fddf | 1773 | |
77e65537 | 1774 | Output_section* dot_section = this->output_section_; |
a445fddf ILT |
1775 | for (Output_section_elements::iterator p = this->elements_.begin(); |
1776 | p != this->elements_.end(); | |
1777 | ++p) | |
77e65537 | 1778 | (*p)->finalize_symbols(symtab, layout, dot_value, &dot_section); |
a445fddf ILT |
1779 | } |
1780 | ||
1781 | // Return the output section name to use for an input section name. | |
1782 | ||
1783 | const char* | |
1784 | Output_section_definition::output_section_name(const char* file_name, | |
1785 | const char* section_name, | |
1786 | Output_section*** slot) | |
1787 | { | |
1788 | // Ask each element whether it matches NAME. | |
1789 | for (Output_section_elements::const_iterator p = this->elements_.begin(); | |
1790 | p != this->elements_.end(); | |
1791 | ++p) | |
1792 | { | |
1793 | if ((*p)->match_name(file_name, section_name)) | |
1794 | { | |
1795 | // We found a match for NAME, which means that it should go | |
1796 | // into this output section. | |
1797 | *slot = &this->output_section_; | |
1798 | return this->name_.c_str(); | |
1799 | } | |
1800 | } | |
1801 | ||
1802 | // We don't know about this section name. | |
1803 | return NULL; | |
1804 | } | |
1805 | ||
a445fddf ILT |
1806 | // Set the section address. Note that the OUTPUT_SECTION_ field will |
1807 | // be NULL if no input sections were mapped to this output section. | |
1808 | // We still have to adjust dot and process symbol assignments. | |
1809 | ||
1810 | void | |
1811 | Output_section_definition::set_section_addresses(Symbol_table* symtab, | |
1812 | Layout* layout, | |
fd247bfe ILT |
1813 | uint64_t* dot_value, |
1814 | uint64_t* load_address) | |
a445fddf | 1815 | { |
a445fddf | 1816 | uint64_t address; |
77e65537 ILT |
1817 | if (this->address_ == NULL) |
1818 | address = *dot_value; | |
a445fddf ILT |
1819 | else |
1820 | { | |
77e65537 | 1821 | Output_section* dummy; |
919ed24c ILT |
1822 | address = this->address_->eval_with_dot(symtab, layout, true, |
1823 | *dot_value, NULL, &dummy); | |
a445fddf ILT |
1824 | } |
1825 | ||
1826 | uint64_t align; | |
1827 | if (this->align_ == NULL) | |
1828 | { | |
1829 | if (this->output_section_ == NULL) | |
1830 | align = 0; | |
1831 | else | |
1832 | align = this->output_section_->addralign(); | |
1833 | } | |
1834 | else | |
1835 | { | |
77e65537 | 1836 | Output_section* align_section; |
919ed24c | 1837 | align = this->align_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 ILT |
1838 | NULL, &align_section); |
1839 | if (align_section != NULL) | |
1840 | gold_warning(_("alignment of section %s is not absolute"), | |
1841 | this->name_.c_str()); | |
a445fddf ILT |
1842 | if (this->output_section_ != NULL) |
1843 | this->output_section_->set_addralign(align); | |
1844 | } | |
1845 | ||
1846 | address = align_address(address, align); | |
1847 | ||
fd247bfe ILT |
1848 | uint64_t start_address = address; |
1849 | ||
a445fddf | 1850 | *dot_value = address; |
a445fddf ILT |
1851 | |
1852 | // The address of non-SHF_ALLOC sections is forced to zero, | |
1853 | // regardless of what the linker script wants. | |
1854 | if (this->output_section_ != NULL | |
1855 | && (this->output_section_->flags() & elfcpp::SHF_ALLOC) != 0) | |
1856 | this->output_section_->set_address(address); | |
1857 | ||
8f2eb564 ILT |
1858 | this->evaluated_address_ = address; |
1859 | this->evaluated_addralign_ = align; | |
1860 | ||
1861 | if (this->load_address_ == NULL) | |
1862 | this->evaluated_load_address_ = address; | |
1863 | else | |
a445fddf | 1864 | { |
77e65537 | 1865 | Output_section* dummy; |
55458500 | 1866 | uint64_t laddr = |
919ed24c | 1867 | this->load_address_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 | 1868 | this->output_section_, &dummy); |
8f2eb564 | 1869 | if (this->output_section_ != NULL) |
55458500 ILT |
1870 | this->output_section_->set_load_address(laddr); |
1871 | this->evaluated_load_address_ = laddr; | |
a445fddf ILT |
1872 | } |
1873 | ||
1874 | uint64_t subalign; | |
1875 | if (this->subalign_ == NULL) | |
1876 | subalign = 0; | |
1877 | else | |
1878 | { | |
77e65537 | 1879 | Output_section* subalign_section; |
919ed24c ILT |
1880 | subalign = this->subalign_->eval_with_dot(symtab, layout, true, |
1881 | *dot_value, NULL, | |
1882 | &subalign_section); | |
77e65537 ILT |
1883 | if (subalign_section != NULL) |
1884 | gold_warning(_("subalign of section %s is not absolute"), | |
1885 | this->name_.c_str()); | |
a445fddf ILT |
1886 | } |
1887 | ||
1888 | std::string fill; | |
1889 | if (this->fill_ != NULL) | |
1890 | { | |
1891 | // FIXME: The GNU linker supports fill values of arbitrary | |
1892 | // length. | |
77e65537 | 1893 | Output_section* fill_section; |
919ed24c | 1894 | uint64_t fill_val = this->fill_->eval_with_dot(symtab, layout, true, |
a445fddf | 1895 | *dot_value, |
77e65537 ILT |
1896 | NULL, |
1897 | &fill_section); | |
1898 | if (fill_section != NULL) | |
1899 | gold_warning(_("fill of section %s is not absolute"), | |
1900 | this->name_.c_str()); | |
a445fddf ILT |
1901 | unsigned char fill_buff[4]; |
1902 | elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val); | |
1903 | fill.assign(reinterpret_cast<char*>(fill_buff), 4); | |
1904 | } | |
1905 | ||
1906 | Input_section_list input_sections; | |
1907 | if (this->output_section_ != NULL) | |
1908 | { | |
1909 | // Get the list of input sections attached to this output | |
1910 | // section. This will leave the output section with only | |
1911 | // Output_section_data entries. | |
1912 | address += this->output_section_->get_input_sections(address, | |
1913 | fill, | |
1914 | &input_sections); | |
1915 | *dot_value = address; | |
1916 | } | |
1917 | ||
77e65537 | 1918 | Output_section* dot_section = this->output_section_; |
a445fddf ILT |
1919 | for (Output_section_elements::iterator p = this->elements_.begin(); |
1920 | p != this->elements_.end(); | |
1921 | ++p) | |
1922 | (*p)->set_section_addresses(symtab, layout, this->output_section_, | |
77e65537 ILT |
1923 | subalign, dot_value, &dot_section, &fill, |
1924 | &input_sections); | |
a445fddf ILT |
1925 | |
1926 | gold_assert(input_sections.empty()); | |
fd247bfe ILT |
1927 | |
1928 | if (this->load_address_ == NULL || this->output_section_ == NULL) | |
1929 | *load_address = *dot_value; | |
1930 | else | |
1931 | *load_address = (this->output_section_->load_address() | |
1932 | + (*dot_value - start_address)); | |
2d924fd9 ILT |
1933 | |
1934 | if (this->output_section_ != NULL) | |
1935 | { | |
1936 | if (this->is_relro_) | |
1937 | this->output_section_->set_is_relro(); | |
1938 | else | |
1939 | this->output_section_->clear_is_relro(); | |
1940 | } | |
a445fddf ILT |
1941 | } |
1942 | ||
3802b2dd ILT |
1943 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
1944 | // this section is constrained, and the input sections do not match, | |
1945 | // return the constraint, and set *POSD. | |
1946 | ||
1947 | Section_constraint | |
1948 | Output_section_definition::check_constraint(Output_section_definition** posd) | |
1949 | { | |
1950 | switch (this->constraint_) | |
1951 | { | |
1952 | case CONSTRAINT_NONE: | |
1953 | return CONSTRAINT_NONE; | |
1954 | ||
1955 | case CONSTRAINT_ONLY_IF_RO: | |
1956 | if (this->output_section_ != NULL | |
1957 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) != 0) | |
1958 | { | |
1959 | *posd = this; | |
1960 | return CONSTRAINT_ONLY_IF_RO; | |
1961 | } | |
1962 | return CONSTRAINT_NONE; | |
1963 | ||
1964 | case CONSTRAINT_ONLY_IF_RW: | |
1965 | if (this->output_section_ != NULL | |
1966 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) == 0) | |
1967 | { | |
1968 | *posd = this; | |
1969 | return CONSTRAINT_ONLY_IF_RW; | |
1970 | } | |
1971 | return CONSTRAINT_NONE; | |
1972 | ||
1973 | case CONSTRAINT_SPECIAL: | |
1974 | if (this->output_section_ != NULL) | |
1975 | gold_error(_("SPECIAL constraints are not implemented")); | |
1976 | return CONSTRAINT_NONE; | |
1977 | ||
1978 | default: | |
1979 | gold_unreachable(); | |
1980 | } | |
1981 | } | |
1982 | ||
1983 | // See if this is the alternate output section for a constrained | |
1984 | // output section. If it is, transfer the Output_section and return | |
1985 | // true. Otherwise return false. | |
1986 | ||
1987 | bool | |
1988 | Output_section_definition::alternate_constraint( | |
1989 | Output_section_definition* posd, | |
1990 | Section_constraint constraint) | |
1991 | { | |
1992 | if (this->name_ != posd->name_) | |
1993 | return false; | |
1994 | ||
1995 | switch (constraint) | |
1996 | { | |
1997 | case CONSTRAINT_ONLY_IF_RO: | |
1998 | if (this->constraint_ != CONSTRAINT_ONLY_IF_RW) | |
1999 | return false; | |
2000 | break; | |
2001 | ||
2002 | case CONSTRAINT_ONLY_IF_RW: | |
2003 | if (this->constraint_ != CONSTRAINT_ONLY_IF_RO) | |
2004 | return false; | |
2005 | break; | |
2006 | ||
2007 | default: | |
2008 | gold_unreachable(); | |
2009 | } | |
2010 | ||
2011 | // We have found the alternate constraint. We just need to move | |
2012 | // over the Output_section. When constraints are used properly, | |
2013 | // THIS should not have an output_section pointer, as all the input | |
2014 | // sections should have matched the other definition. | |
2015 | ||
2016 | if (this->output_section_ != NULL) | |
2017 | gold_error(_("mismatched definition for constrained sections")); | |
2018 | ||
2019 | this->output_section_ = posd->output_section_; | |
2020 | posd->output_section_ = NULL; | |
2021 | ||
2d924fd9 ILT |
2022 | if (this->is_relro_) |
2023 | this->output_section_->set_is_relro(); | |
2024 | else | |
2025 | this->output_section_->clear_is_relro(); | |
2026 | ||
3802b2dd ILT |
2027 | return true; |
2028 | } | |
2029 | ||
1c4f3631 | 2030 | // Get the list of segments to use for an allocated section when using |
2cefc357 | 2031 | // a PHDRS clause. |
1c4f3631 ILT |
2032 | |
2033 | Output_section* | |
2cefc357 ILT |
2034 | Output_section_definition::allocate_to_segment(String_list** phdrs_list, |
2035 | bool* orphan) | |
1c4f3631 ILT |
2036 | { |
2037 | if (this->output_section_ == NULL) | |
2038 | return NULL; | |
2039 | if ((this->output_section_->flags() & elfcpp::SHF_ALLOC) == 0) | |
2040 | return NULL; | |
2cefc357 | 2041 | *orphan = false; |
1c4f3631 ILT |
2042 | if (this->phdrs_ != NULL) |
2043 | *phdrs_list = this->phdrs_; | |
2044 | return this->output_section_; | |
2045 | } | |
2046 | ||
8f2eb564 ILT |
2047 | // Look for an output section by name and return the address, the load |
2048 | // address, the alignment, and the size. This is used when an | |
2049 | // expression refers to an output section which was not actually | |
2050 | // created. This returns true if the section was found, false | |
2051 | // otherwise. | |
2052 | ||
2053 | bool | |
2054 | Output_section_definition::get_output_section_info(const char* name, | |
2055 | uint64_t* address, | |
2056 | uint64_t* load_address, | |
2057 | uint64_t* addralign, | |
2058 | uint64_t* size) const | |
2059 | { | |
2060 | if (this->name_ != name) | |
2061 | return false; | |
2062 | ||
2063 | if (this->output_section_ != NULL) | |
2064 | { | |
2065 | *address = this->output_section_->address(); | |
2066 | if (this->output_section_->has_load_address()) | |
2067 | *load_address = this->output_section_->load_address(); | |
2068 | else | |
2069 | *load_address = *address; | |
2070 | *addralign = this->output_section_->addralign(); | |
2071 | *size = this->output_section_->current_data_size(); | |
2072 | } | |
2073 | else | |
2074 | { | |
2075 | *address = this->evaluated_address_; | |
2076 | *load_address = this->evaluated_load_address_; | |
2077 | *addralign = this->evaluated_addralign_; | |
2078 | *size = 0; | |
2079 | } | |
2080 | ||
2081 | return true; | |
2082 | } | |
2083 | ||
494e05f4 ILT |
2084 | // Print for debugging. |
2085 | ||
2086 | void | |
2087 | Output_section_definition::print(FILE* f) const | |
2088 | { | |
2089 | fprintf(f, " %s ", this->name_.c_str()); | |
2090 | ||
2091 | if (this->address_ != NULL) | |
2092 | { | |
2093 | this->address_->print(f); | |
2094 | fprintf(f, " "); | |
2095 | } | |
2096 | ||
2097 | fprintf(f, ": "); | |
2098 | ||
2099 | if (this->load_address_ != NULL) | |
2100 | { | |
2101 | fprintf(f, "AT("); | |
2102 | this->load_address_->print(f); | |
2103 | fprintf(f, ") "); | |
2104 | } | |
2105 | ||
2106 | if (this->align_ != NULL) | |
2107 | { | |
2108 | fprintf(f, "ALIGN("); | |
2109 | this->align_->print(f); | |
2110 | fprintf(f, ") "); | |
2111 | } | |
2112 | ||
2113 | if (this->subalign_ != NULL) | |
2114 | { | |
2115 | fprintf(f, "SUBALIGN("); | |
2116 | this->subalign_->print(f); | |
2117 | fprintf(f, ") "); | |
2118 | } | |
2119 | ||
2120 | fprintf(f, "{\n"); | |
2121 | ||
2122 | for (Output_section_elements::const_iterator p = this->elements_.begin(); | |
2123 | p != this->elements_.end(); | |
2124 | ++p) | |
2125 | (*p)->print(f); | |
2126 | ||
2127 | fprintf(f, " }"); | |
2128 | ||
2129 | if (this->fill_ != NULL) | |
2130 | { | |
2131 | fprintf(f, " = "); | |
2132 | this->fill_->print(f); | |
2133 | } | |
2134 | ||
7d26c6cc ILT |
2135 | if (this->phdrs_ != NULL) |
2136 | { | |
2137 | for (String_list::const_iterator p = this->phdrs_->begin(); | |
2138 | p != this->phdrs_->end(); | |
2139 | ++p) | |
2140 | fprintf(f, " :%s", p->c_str()); | |
2141 | } | |
2142 | ||
494e05f4 ILT |
2143 | fprintf(f, "\n"); |
2144 | } | |
2145 | ||
a445fddf ILT |
2146 | // An output section created to hold orphaned input sections. These |
2147 | // do not actually appear in linker scripts. However, for convenience | |
2148 | // when setting the output section addresses, we put a marker to these | |
2149 | // sections in the appropriate place in the list of SECTIONS elements. | |
2150 | ||
2151 | class Orphan_output_section : public Sections_element | |
2152 | { | |
2153 | public: | |
2154 | Orphan_output_section(Output_section* os) | |
2155 | : os_(os) | |
2156 | { } | |
2157 | ||
0d371ad3 ILT |
2158 | // Return whether the orphan output section is relro. We can just |
2159 | // check the output section because we always set the flag, if | |
2160 | // needed, just after we create the Orphan_output_section. | |
a445fddf | 2161 | bool |
0d371ad3 ILT |
2162 | is_relro() const |
2163 | { return this->os_->is_relro(); } | |
2164 | ||
2165 | // Initialize OSP with an output section. This should have been | |
2166 | // done already. | |
2167 | void | |
2168 | orphan_section_init(Orphan_section_placement*, | |
2169 | Script_sections::Elements_iterator) | |
2170 | { gold_unreachable(); } | |
a445fddf ILT |
2171 | |
2172 | // Set section addresses. | |
2173 | void | |
fd247bfe | 2174 | set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*); |
a445fddf | 2175 | |
1c4f3631 | 2176 | // Get the list of segments to use for an allocated section when |
2cefc357 | 2177 | // using a PHDRS clause. |
1c4f3631 | 2178 | Output_section* |
2cefc357 | 2179 | allocate_to_segment(String_list**, bool*); |
1c4f3631 | 2180 | |
2d924fd9 ILT |
2181 | // Return the associated Output_section. |
2182 | Output_section* | |
2183 | get_output_section() const | |
2184 | { return this->os_; } | |
2185 | ||
a445fddf ILT |
2186 | // Print for debugging. |
2187 | void | |
2188 | print(FILE* f) const | |
2189 | { | |
2190 | fprintf(f, " marker for orphaned output section %s\n", | |
2191 | this->os_->name()); | |
2192 | } | |
2193 | ||
2194 | private: | |
2195 | Output_section* os_; | |
2196 | }; | |
2197 | ||
a445fddf ILT |
2198 | // Set section addresses. |
2199 | ||
2200 | void | |
2201 | Orphan_output_section::set_section_addresses(Symbol_table*, Layout*, | |
fd247bfe ILT |
2202 | uint64_t* dot_value, |
2203 | uint64_t* load_address) | |
a445fddf ILT |
2204 | { |
2205 | typedef std::list<std::pair<Relobj*, unsigned int> > Input_section_list; | |
2206 | ||
fd247bfe ILT |
2207 | bool have_load_address = *load_address != *dot_value; |
2208 | ||
a445fddf ILT |
2209 | uint64_t address = *dot_value; |
2210 | address = align_address(address, this->os_->addralign()); | |
2211 | ||
2212 | if ((this->os_->flags() & elfcpp::SHF_ALLOC) != 0) | |
fd247bfe ILT |
2213 | { |
2214 | this->os_->set_address(address); | |
2215 | if (have_load_address) | |
2216 | this->os_->set_load_address(align_address(*load_address, | |
2217 | this->os_->addralign())); | |
2218 | } | |
a445fddf ILT |
2219 | |
2220 | Input_section_list input_sections; | |
2221 | address += this->os_->get_input_sections(address, "", &input_sections); | |
2222 | ||
2223 | for (Input_section_list::iterator p = input_sections.begin(); | |
2224 | p != input_sections.end(); | |
2225 | ++p) | |
2226 | { | |
2227 | uint64_t addralign; | |
2228 | uint64_t size; | |
2229 | ||
2230 | // We know what are single-threaded, so it is OK to lock the | |
2231 | // object. | |
2232 | { | |
2233 | const Task* task = reinterpret_cast<const Task*>(-1); | |
2234 | Task_lock_obj<Object> tl(task, p->first); | |
2235 | addralign = p->first->section_addralign(p->second); | |
2236 | size = p->first->section_size(p->second); | |
2237 | } | |
2238 | ||
2239 | address = align_address(address, addralign); | |
0e43bb4e ILT |
2240 | this->os_->add_input_section_for_script(p->first, p->second, size, |
2241 | addralign); | |
a445fddf ILT |
2242 | address += size; |
2243 | } | |
2244 | ||
fd247bfe ILT |
2245 | if (!have_load_address) |
2246 | *load_address = address; | |
2247 | else | |
2248 | *load_address += address - *dot_value; | |
2249 | ||
a445fddf ILT |
2250 | *dot_value = address; |
2251 | } | |
2252 | ||
1c4f3631 ILT |
2253 | // Get the list of segments to use for an allocated section when using |
2254 | // a PHDRS clause. If this is an allocated section, return the | |
2255 | // Output_section. We don't change the list of segments. | |
2256 | ||
2257 | Output_section* | |
2cefc357 | 2258 | Orphan_output_section::allocate_to_segment(String_list**, bool* orphan) |
1c4f3631 ILT |
2259 | { |
2260 | if ((this->os_->flags() & elfcpp::SHF_ALLOC) == 0) | |
2261 | return NULL; | |
2cefc357 | 2262 | *orphan = true; |
1c4f3631 ILT |
2263 | return this->os_; |
2264 | } | |
2265 | ||
2266 | // Class Phdrs_element. A program header from a PHDRS clause. | |
2267 | ||
2268 | class Phdrs_element | |
2269 | { | |
2270 | public: | |
2271 | Phdrs_element(const char* name, size_t namelen, unsigned int type, | |
2272 | bool includes_filehdr, bool includes_phdrs, | |
2273 | bool is_flags_valid, unsigned int flags, | |
2274 | Expression* load_address) | |
2275 | : name_(name, namelen), type_(type), includes_filehdr_(includes_filehdr), | |
2276 | includes_phdrs_(includes_phdrs), is_flags_valid_(is_flags_valid), | |
2277 | flags_(flags), load_address_(load_address), load_address_value_(0), | |
2278 | segment_(NULL) | |
2279 | { } | |
2280 | ||
2281 | // Return the name of this segment. | |
2282 | const std::string& | |
2283 | name() const | |
2284 | { return this->name_; } | |
2285 | ||
2286 | // Return the type of the segment. | |
2287 | unsigned int | |
2288 | type() const | |
2289 | { return this->type_; } | |
2290 | ||
2291 | // Whether to include the file header. | |
2292 | bool | |
2293 | includes_filehdr() const | |
2294 | { return this->includes_filehdr_; } | |
2295 | ||
2296 | // Whether to include the program headers. | |
2297 | bool | |
2298 | includes_phdrs() const | |
2299 | { return this->includes_phdrs_; } | |
2300 | ||
2301 | // Return whether there is a load address. | |
2302 | bool | |
2303 | has_load_address() const | |
2304 | { return this->load_address_ != NULL; } | |
2305 | ||
2306 | // Evaluate the load address expression if there is one. | |
2307 | void | |
2308 | eval_load_address(Symbol_table* symtab, Layout* layout) | |
2309 | { | |
2310 | if (this->load_address_ != NULL) | |
919ed24c ILT |
2311 | this->load_address_value_ = this->load_address_->eval(symtab, layout, |
2312 | true); | |
1c4f3631 ILT |
2313 | } |
2314 | ||
2315 | // Return the load address. | |
2316 | uint64_t | |
2317 | load_address() const | |
2318 | { | |
2319 | gold_assert(this->load_address_ != NULL); | |
2320 | return this->load_address_value_; | |
2321 | } | |
2322 | ||
2323 | // Create the segment. | |
2324 | Output_segment* | |
2325 | create_segment(Layout* layout) | |
2326 | { | |
2327 | this->segment_ = layout->make_output_segment(this->type_, this->flags_); | |
2328 | return this->segment_; | |
2329 | } | |
2330 | ||
2331 | // Return the segment. | |
2332 | Output_segment* | |
2333 | segment() | |
2334 | { return this->segment_; } | |
2335 | ||
2336 | // Set the segment flags if appropriate. | |
2337 | void | |
2338 | set_flags_if_valid() | |
2339 | { | |
2340 | if (this->is_flags_valid_) | |
2341 | this->segment_->set_flags(this->flags_); | |
2342 | } | |
2343 | ||
7d26c6cc ILT |
2344 | // Print for debugging. |
2345 | void | |
2346 | print(FILE*) const; | |
2347 | ||
1c4f3631 ILT |
2348 | private: |
2349 | // The name used in the script. | |
2350 | std::string name_; | |
2351 | // The type of the segment (PT_LOAD, etc.). | |
2352 | unsigned int type_; | |
2353 | // Whether this segment includes the file header. | |
2354 | bool includes_filehdr_; | |
2355 | // Whether this segment includes the section headers. | |
2356 | bool includes_phdrs_; | |
2357 | // Whether the flags were explicitly specified. | |
2358 | bool is_flags_valid_; | |
2359 | // The flags for this segment (PF_R, etc.) if specified. | |
2360 | unsigned int flags_; | |
2361 | // The expression for the load address for this segment. This may | |
2362 | // be NULL. | |
2363 | Expression* load_address_; | |
2364 | // The actual load address from evaluating the expression. | |
2365 | uint64_t load_address_value_; | |
2366 | // The segment itself. | |
2367 | Output_segment* segment_; | |
2368 | }; | |
2369 | ||
7d26c6cc ILT |
2370 | // Print for debugging. |
2371 | ||
2372 | void | |
2373 | Phdrs_element::print(FILE* f) const | |
2374 | { | |
2375 | fprintf(f, " %s 0x%x", this->name_.c_str(), this->type_); | |
2376 | if (this->includes_filehdr_) | |
2377 | fprintf(f, " FILEHDR"); | |
2378 | if (this->includes_phdrs_) | |
2379 | fprintf(f, " PHDRS"); | |
2380 | if (this->is_flags_valid_) | |
2381 | fprintf(f, " FLAGS(%u)", this->flags_); | |
2382 | if (this->load_address_ != NULL) | |
2383 | { | |
2384 | fprintf(f, " AT("); | |
2385 | this->load_address_->print(f); | |
2386 | fprintf(f, ")"); | |
2387 | } | |
2388 | fprintf(f, ";\n"); | |
2389 | } | |
2390 | ||
494e05f4 ILT |
2391 | // Class Script_sections. |
2392 | ||
2393 | Script_sections::Script_sections() | |
2394 | : saw_sections_clause_(false), | |
2395 | in_sections_clause_(false), | |
2396 | sections_elements_(NULL), | |
1c4f3631 | 2397 | output_section_(NULL), |
2d924fd9 | 2398 | phdrs_elements_(NULL), |
0d371ad3 ILT |
2399 | orphan_section_placement_(NULL), |
2400 | data_segment_align_start_(), | |
2401 | saw_data_segment_align_(false), | |
2d924fd9 | 2402 | saw_relro_end_(false) |
494e05f4 ILT |
2403 | { |
2404 | } | |
2405 | ||
2406 | // Start a SECTIONS clause. | |
2407 | ||
2408 | void | |
2409 | Script_sections::start_sections() | |
2410 | { | |
2411 | gold_assert(!this->in_sections_clause_ && this->output_section_ == NULL); | |
2412 | this->saw_sections_clause_ = true; | |
2413 | this->in_sections_clause_ = true; | |
2414 | if (this->sections_elements_ == NULL) | |
2415 | this->sections_elements_ = new Sections_elements; | |
2416 | } | |
2417 | ||
2418 | // Finish a SECTIONS clause. | |
2419 | ||
2420 | void | |
2421 | Script_sections::finish_sections() | |
2422 | { | |
2423 | gold_assert(this->in_sections_clause_ && this->output_section_ == NULL); | |
2424 | this->in_sections_clause_ = false; | |
2425 | } | |
2426 | ||
2427 | // Add a symbol to be defined. | |
2428 | ||
2429 | void | |
2430 | Script_sections::add_symbol_assignment(const char* name, size_t length, | |
2431 | Expression* val, bool provide, | |
2432 | bool hidden) | |
2433 | { | |
2434 | if (this->output_section_ != NULL) | |
2435 | this->output_section_->add_symbol_assignment(name, length, val, | |
2436 | provide, hidden); | |
2437 | else | |
2438 | { | |
2439 | Sections_element* p = new Sections_element_assignment(name, length, | |
2440 | val, provide, | |
2441 | hidden); | |
2442 | this->sections_elements_->push_back(p); | |
2443 | } | |
2444 | } | |
2445 | ||
a445fddf ILT |
2446 | // Add an assignment to the special dot symbol. |
2447 | ||
2448 | void | |
2449 | Script_sections::add_dot_assignment(Expression* val) | |
2450 | { | |
2451 | if (this->output_section_ != NULL) | |
2452 | this->output_section_->add_dot_assignment(val); | |
2453 | else | |
2454 | { | |
2455 | Sections_element* p = new Sections_element_dot_assignment(val); | |
2456 | this->sections_elements_->push_back(p); | |
2457 | } | |
2458 | } | |
2459 | ||
494e05f4 ILT |
2460 | // Add an assertion. |
2461 | ||
2462 | void | |
2463 | Script_sections::add_assertion(Expression* check, const char* message, | |
2464 | size_t messagelen) | |
2465 | { | |
2466 | if (this->output_section_ != NULL) | |
2467 | this->output_section_->add_assertion(check, message, messagelen); | |
2468 | else | |
2469 | { | |
2470 | Sections_element* p = new Sections_element_assertion(check, message, | |
2471 | messagelen); | |
2472 | this->sections_elements_->push_back(p); | |
2473 | } | |
2474 | } | |
2475 | ||
2476 | // Start processing entries for an output section. | |
2477 | ||
2478 | void | |
2479 | Script_sections::start_output_section( | |
2480 | const char* name, | |
2481 | size_t namelen, | |
2482 | const Parser_output_section_header *header) | |
2483 | { | |
2484 | Output_section_definition* posd = new Output_section_definition(name, | |
2485 | namelen, | |
2486 | header); | |
2487 | this->sections_elements_->push_back(posd); | |
2488 | gold_assert(this->output_section_ == NULL); | |
2489 | this->output_section_ = posd; | |
2490 | } | |
2491 | ||
2492 | // Stop processing entries for an output section. | |
2493 | ||
2494 | void | |
2495 | Script_sections::finish_output_section( | |
2496 | const Parser_output_section_trailer* trailer) | |
2497 | { | |
2498 | gold_assert(this->output_section_ != NULL); | |
2499 | this->output_section_->finish(trailer); | |
2500 | this->output_section_ = NULL; | |
2501 | } | |
2502 | ||
2503 | // Add a data item to the current output section. | |
2504 | ||
2505 | void | |
2506 | Script_sections::add_data(int size, bool is_signed, Expression* val) | |
2507 | { | |
2508 | gold_assert(this->output_section_ != NULL); | |
2509 | this->output_section_->add_data(size, is_signed, val); | |
2510 | } | |
2511 | ||
2512 | // Add a fill value setting to the current output section. | |
2513 | ||
2514 | void | |
2515 | Script_sections::add_fill(Expression* val) | |
2516 | { | |
2517 | gold_assert(this->output_section_ != NULL); | |
2518 | this->output_section_->add_fill(val); | |
2519 | } | |
2520 | ||
2521 | // Add an input section specification to the current output section. | |
2522 | ||
2523 | void | |
2524 | Script_sections::add_input_section(const Input_section_spec* spec, bool keep) | |
2525 | { | |
2526 | gold_assert(this->output_section_ != NULL); | |
2527 | this->output_section_->add_input_section(spec, keep); | |
2528 | } | |
2529 | ||
2d924fd9 ILT |
2530 | // This is called when we see DATA_SEGMENT_ALIGN. It means that any |
2531 | // subsequent output sections may be relro. | |
2532 | ||
2533 | void | |
2534 | Script_sections::data_segment_align() | |
2535 | { | |
0d371ad3 | 2536 | if (this->saw_data_segment_align_) |
2d924fd9 | 2537 | gold_error(_("DATA_SEGMENT_ALIGN may only appear once in a linker script")); |
0d371ad3 ILT |
2538 | gold_assert(!this->sections_elements_->empty()); |
2539 | Sections_elements::iterator p = this->sections_elements_->end(); | |
2540 | --p; | |
2541 | this->data_segment_align_start_ = p; | |
2542 | this->saw_data_segment_align_ = true; | |
2d924fd9 ILT |
2543 | } |
2544 | ||
2545 | // This is called when we see DATA_SEGMENT_RELRO_END. It means that | |
2546 | // any output sections seen since DATA_SEGMENT_ALIGN are relro. | |
2547 | ||
2548 | void | |
2549 | Script_sections::data_segment_relro_end() | |
2550 | { | |
2551 | if (this->saw_relro_end_) | |
2552 | gold_error(_("DATA_SEGMENT_RELRO_END may only appear once " | |
2553 | "in a linker script")); | |
2554 | this->saw_relro_end_ = true; | |
2555 | ||
0d371ad3 | 2556 | if (!this->saw_data_segment_align_) |
2d924fd9 ILT |
2557 | gold_error(_("DATA_SEGMENT_RELRO_END must follow DATA_SEGMENT_ALIGN")); |
2558 | else | |
2559 | { | |
0d371ad3 ILT |
2560 | Sections_elements::iterator p = this->data_segment_align_start_; |
2561 | for (++p; p != this->sections_elements_->end(); ++p) | |
2562 | (*p)->set_is_relro(); | |
2d924fd9 ILT |
2563 | } |
2564 | } | |
2565 | ||
919ed24c ILT |
2566 | // Create any required sections. |
2567 | ||
2568 | void | |
2569 | Script_sections::create_sections(Layout* layout) | |
2570 | { | |
2571 | if (!this->saw_sections_clause_) | |
2572 | return; | |
2573 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2574 | p != this->sections_elements_->end(); | |
2575 | ++p) | |
2576 | (*p)->create_sections(layout); | |
2577 | } | |
2578 | ||
a445fddf ILT |
2579 | // Add any symbols we are defining to the symbol table. |
2580 | ||
2581 | void | |
2582 | Script_sections::add_symbols_to_table(Symbol_table* symtab) | |
2583 | { | |
2584 | if (!this->saw_sections_clause_) | |
2585 | return; | |
2586 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2587 | p != this->sections_elements_->end(); | |
2588 | ++p) | |
2589 | (*p)->add_symbols_to_table(symtab); | |
2590 | } | |
2591 | ||
2592 | // Finalize symbols and check assertions. | |
2593 | ||
2594 | void | |
2595 | Script_sections::finalize_symbols(Symbol_table* symtab, const Layout* layout) | |
2596 | { | |
2597 | if (!this->saw_sections_clause_) | |
2598 | return; | |
a445fddf ILT |
2599 | uint64_t dot_value = 0; |
2600 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2601 | p != this->sections_elements_->end(); | |
2602 | ++p) | |
77e65537 | 2603 | (*p)->finalize_symbols(symtab, layout, &dot_value); |
a445fddf ILT |
2604 | } |
2605 | ||
2606 | // Return the name of the output section to use for an input file name | |
2607 | // and section name. | |
2608 | ||
2609 | const char* | |
2610 | Script_sections::output_section_name(const char* file_name, | |
2611 | const char* section_name, | |
2612 | Output_section*** output_section_slot) | |
2613 | { | |
2614 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
2615 | p != this->sections_elements_->end(); | |
2616 | ++p) | |
2617 | { | |
2618 | const char* ret = (*p)->output_section_name(file_name, section_name, | |
2619 | output_section_slot); | |
2620 | ||
2621 | if (ret != NULL) | |
2622 | { | |
2623 | // The special name /DISCARD/ means that the input section | |
2624 | // should be discarded. | |
2625 | if (strcmp(ret, "/DISCARD/") == 0) | |
2626 | { | |
2627 | *output_section_slot = NULL; | |
2628 | return NULL; | |
2629 | } | |
2630 | return ret; | |
2631 | } | |
2632 | } | |
2633 | ||
2634 | // If we couldn't find a mapping for the name, the output section | |
2635 | // gets the name of the input section. | |
2636 | ||
2637 | *output_section_slot = NULL; | |
2638 | ||
2639 | return section_name; | |
2640 | } | |
2641 | ||
2642 | // Place a marker for an orphan output section into the SECTIONS | |
2643 | // clause. | |
2644 | ||
2645 | void | |
2646 | Script_sections::place_orphan(Output_section* os) | |
2647 | { | |
0d371ad3 ILT |
2648 | Orphan_section_placement* osp = this->orphan_section_placement_; |
2649 | if (osp == NULL) | |
a445fddf | 2650 | { |
0d371ad3 ILT |
2651 | // Initialize the Orphan_section_placement structure. |
2652 | osp = new Orphan_section_placement(); | |
2653 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2654 | p != this->sections_elements_->end(); | |
2655 | ++p) | |
2656 | (*p)->orphan_section_init(osp, p); | |
2657 | gold_assert(!this->sections_elements_->empty()); | |
2658 | Sections_elements::iterator last = this->sections_elements_->end(); | |
2659 | --last; | |
2660 | osp->last_init(last); | |
2661 | this->orphan_section_placement_ = osp; | |
a445fddf ILT |
2662 | } |
2663 | ||
0d371ad3 | 2664 | Orphan_output_section* orphan = new Orphan_output_section(os); |
2d924fd9 | 2665 | |
0d371ad3 ILT |
2666 | // Look for where to put ORPHAN. |
2667 | Sections_elements::iterator* where; | |
2668 | if (osp->find_place(os, &where)) | |
2669 | { | |
2670 | if ((**where)->is_relro()) | |
2671 | os->set_is_relro(); | |
2672 | else | |
2673 | os->clear_is_relro(); | |
2674 | ||
2675 | // We want to insert ORPHAN after *WHERE, and then update *WHERE | |
2676 | // so that the next one goes after this one. | |
2677 | Sections_elements::iterator p = *where; | |
2678 | gold_assert(p != this->sections_elements_->end()); | |
2679 | ++p; | |
2680 | *where = this->sections_elements_->insert(p, orphan); | |
2681 | } | |
2d924fd9 | 2682 | else |
0d371ad3 ILT |
2683 | { |
2684 | os->clear_is_relro(); | |
2685 | // We don't have a place to put this orphan section. Put it, | |
2686 | // and all other sections like it, at the end, but before the | |
2687 | // sections which always come at the end. | |
2688 | Sections_elements::iterator last = osp->last_place(); | |
2689 | *where = this->sections_elements_->insert(last, orphan); | |
2690 | } | |
a445fddf ILT |
2691 | } |
2692 | ||
2693 | // Set the addresses of all the output sections. Walk through all the | |
2694 | // elements, tracking the dot symbol. Apply assignments which set | |
2695 | // absolute symbol values, in case they are used when setting dot. | |
2696 | // Fill in data statement values. As we find output sections, set the | |
2697 | // address, set the address of all associated input sections, and | |
2698 | // update dot. Return the segment which should hold the file header | |
2699 | // and segment headers, if any. | |
2700 | ||
2701 | Output_segment* | |
2702 | Script_sections::set_section_addresses(Symbol_table* symtab, Layout* layout) | |
2703 | { | |
2704 | gold_assert(this->saw_sections_clause_); | |
2705 | ||
3802b2dd ILT |
2706 | // Implement ONLY_IF_RO/ONLY_IF_RW constraints. These are a pain |
2707 | // for our representation. | |
2708 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2709 | p != this->sections_elements_->end(); | |
2710 | ++p) | |
2711 | { | |
2712 | Output_section_definition* posd; | |
2713 | Section_constraint failed_constraint = (*p)->check_constraint(&posd); | |
2714 | if (failed_constraint != CONSTRAINT_NONE) | |
2715 | { | |
2716 | Sections_elements::iterator q; | |
2717 | for (q = this->sections_elements_->begin(); | |
2718 | q != this->sections_elements_->end(); | |
2719 | ++q) | |
2720 | { | |
2721 | if (q != p) | |
2722 | { | |
2723 | if ((*q)->alternate_constraint(posd, failed_constraint)) | |
2724 | break; | |
2725 | } | |
2726 | } | |
2727 | ||
2728 | if (q == this->sections_elements_->end()) | |
2729 | gold_error(_("no matching section constraint")); | |
2730 | } | |
2731 | } | |
2732 | ||
2d924fd9 ILT |
2733 | // Force the alignment of the first TLS section to be the maximum |
2734 | // alignment of all TLS sections. | |
2735 | Output_section* first_tls = NULL; | |
2736 | uint64_t tls_align = 0; | |
2737 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
2738 | p != this->sections_elements_->end(); | |
2739 | ++p) | |
2740 | { | |
2741 | Output_section *os = (*p)->get_output_section(); | |
2742 | if (os != NULL && (os->flags() & elfcpp::SHF_TLS) != 0) | |
2743 | { | |
2744 | if (first_tls == NULL) | |
2745 | first_tls = os; | |
2746 | if (os->addralign() > tls_align) | |
2747 | tls_align = os->addralign(); | |
2748 | } | |
2749 | } | |
2750 | if (first_tls != NULL) | |
2751 | first_tls->set_addralign(tls_align); | |
2752 | ||
77e65537 | 2753 | // For a relocatable link, we implicitly set dot to zero. |
a445fddf | 2754 | uint64_t dot_value = 0; |
fd247bfe | 2755 | uint64_t load_address = 0; |
a445fddf ILT |
2756 | for (Sections_elements::iterator p = this->sections_elements_->begin(); |
2757 | p != this->sections_elements_->end(); | |
2758 | ++p) | |
fd247bfe | 2759 | (*p)->set_section_addresses(symtab, layout, &dot_value, &load_address); |
a445fddf | 2760 | |
1c4f3631 ILT |
2761 | if (this->phdrs_elements_ != NULL) |
2762 | { | |
2763 | for (Phdrs_elements::iterator p = this->phdrs_elements_->begin(); | |
2764 | p != this->phdrs_elements_->end(); | |
2765 | ++p) | |
2766 | (*p)->eval_load_address(symtab, layout); | |
2767 | } | |
2768 | ||
a445fddf ILT |
2769 | return this->create_segments(layout); |
2770 | } | |
2771 | ||
2772 | // Sort the sections in order to put them into segments. | |
2773 | ||
2774 | class Sort_output_sections | |
2775 | { | |
2776 | public: | |
2777 | bool | |
2778 | operator()(const Output_section* os1, const Output_section* os2) const; | |
2779 | }; | |
2780 | ||
2781 | bool | |
2782 | Sort_output_sections::operator()(const Output_section* os1, | |
2783 | const Output_section* os2) const | |
2784 | { | |
2785 | // Sort first by the load address. | |
2786 | uint64_t lma1 = (os1->has_load_address() | |
2787 | ? os1->load_address() | |
2788 | : os1->address()); | |
2789 | uint64_t lma2 = (os2->has_load_address() | |
2790 | ? os2->load_address() | |
2791 | : os2->address()); | |
2792 | if (lma1 != lma2) | |
2793 | return lma1 < lma2; | |
2794 | ||
2795 | // Then sort by the virtual address. | |
2796 | if (os1->address() != os2->address()) | |
2797 | return os1->address() < os2->address(); | |
2798 | ||
2799 | // Sort TLS sections to the end. | |
2800 | bool tls1 = (os1->flags() & elfcpp::SHF_TLS) != 0; | |
2801 | bool tls2 = (os2->flags() & elfcpp::SHF_TLS) != 0; | |
2802 | if (tls1 != tls2) | |
2803 | return tls2; | |
2804 | ||
2805 | // Sort PROGBITS before NOBITS. | |
2806 | if (os1->type() == elfcpp::SHT_PROGBITS && os2->type() == elfcpp::SHT_NOBITS) | |
2807 | return true; | |
2808 | if (os1->type() == elfcpp::SHT_NOBITS && os2->type() == elfcpp::SHT_PROGBITS) | |
2809 | return false; | |
2810 | ||
2811 | // Otherwise we don't care. | |
2812 | return false; | |
2813 | } | |
2814 | ||
2815 | // Return whether OS is a BSS section. This is a SHT_NOBITS section. | |
2816 | // We treat a section with the SHF_TLS flag set as taking up space | |
2817 | // even if it is SHT_NOBITS (this is true of .tbss), as we allocate | |
2818 | // space for them in the file. | |
2819 | ||
2820 | bool | |
2821 | Script_sections::is_bss_section(const Output_section* os) | |
2822 | { | |
2823 | return (os->type() == elfcpp::SHT_NOBITS | |
2824 | && (os->flags() & elfcpp::SHF_TLS) == 0); | |
2825 | } | |
2826 | ||
1c4f3631 ILT |
2827 | // Return the size taken by the file header and the program headers. |
2828 | ||
2829 | size_t | |
2830 | Script_sections::total_header_size(Layout* layout) const | |
2831 | { | |
2832 | size_t segment_count = layout->segment_count(); | |
2833 | size_t file_header_size; | |
2834 | size_t segment_headers_size; | |
8851ecca | 2835 | if (parameters->target().get_size() == 32) |
1c4f3631 ILT |
2836 | { |
2837 | file_header_size = elfcpp::Elf_sizes<32>::ehdr_size; | |
2838 | segment_headers_size = segment_count * elfcpp::Elf_sizes<32>::phdr_size; | |
2839 | } | |
8851ecca | 2840 | else if (parameters->target().get_size() == 64) |
1c4f3631 ILT |
2841 | { |
2842 | file_header_size = elfcpp::Elf_sizes<64>::ehdr_size; | |
2843 | segment_headers_size = segment_count * elfcpp::Elf_sizes<64>::phdr_size; | |
2844 | } | |
2845 | else | |
2846 | gold_unreachable(); | |
2847 | ||
2848 | return file_header_size + segment_headers_size; | |
2849 | } | |
2850 | ||
2851 | // Return the amount we have to subtract from the LMA to accomodate | |
2852 | // headers of the given size. The complication is that the file | |
2853 | // header have to be at the start of a page, as otherwise it will not | |
2854 | // be at the start of the file. | |
2855 | ||
2856 | uint64_t | |
2857 | Script_sections::header_size_adjustment(uint64_t lma, | |
2858 | size_t sizeof_headers) const | |
2859 | { | |
8851ecca | 2860 | const uint64_t abi_pagesize = parameters->target().abi_pagesize(); |
1c4f3631 ILT |
2861 | uint64_t hdr_lma = lma - sizeof_headers; |
2862 | hdr_lma &= ~(abi_pagesize - 1); | |
2863 | return lma - hdr_lma; | |
2864 | } | |
2865 | ||
a445fddf ILT |
2866 | // Create the PT_LOAD segments when using a SECTIONS clause. Returns |
2867 | // the segment which should hold the file header and segment headers, | |
2868 | // if any. | |
2869 | ||
2870 | Output_segment* | |
2871 | Script_sections::create_segments(Layout* layout) | |
2872 | { | |
2873 | gold_assert(this->saw_sections_clause_); | |
2874 | ||
8851ecca | 2875 | if (parameters->options().relocatable()) |
a445fddf ILT |
2876 | return NULL; |
2877 | ||
1c4f3631 ILT |
2878 | if (this->saw_phdrs_clause()) |
2879 | return create_segments_from_phdrs_clause(layout); | |
2880 | ||
a445fddf ILT |
2881 | Layout::Section_list sections; |
2882 | layout->get_allocated_sections(§ions); | |
2883 | ||
2884 | // Sort the sections by address. | |
2885 | std::stable_sort(sections.begin(), sections.end(), Sort_output_sections()); | |
2886 | ||
2887 | this->create_note_and_tls_segments(layout, §ions); | |
2888 | ||
2889 | // Walk through the sections adding them to PT_LOAD segments. | |
8851ecca | 2890 | const uint64_t abi_pagesize = parameters->target().abi_pagesize(); |
a445fddf ILT |
2891 | Output_segment* first_seg = NULL; |
2892 | Output_segment* current_seg = NULL; | |
2893 | bool is_current_seg_readonly = true; | |
2894 | Layout::Section_list::iterator plast = sections.end(); | |
2895 | uint64_t last_vma = 0; | |
2896 | uint64_t last_lma = 0; | |
2897 | uint64_t last_size = 0; | |
2898 | for (Layout::Section_list::iterator p = sections.begin(); | |
2899 | p != sections.end(); | |
2900 | ++p) | |
2901 | { | |
2902 | const uint64_t vma = (*p)->address(); | |
2903 | const uint64_t lma = ((*p)->has_load_address() | |
2904 | ? (*p)->load_address() | |
2905 | : vma); | |
2906 | const uint64_t size = (*p)->current_data_size(); | |
2907 | ||
2908 | bool need_new_segment; | |
2909 | if (current_seg == NULL) | |
2910 | need_new_segment = true; | |
2911 | else if (lma - vma != last_lma - last_vma) | |
2912 | { | |
2913 | // This section has a different LMA relationship than the | |
2914 | // last one; we need a new segment. | |
2915 | need_new_segment = true; | |
2916 | } | |
2917 | else if (align_address(last_lma + last_size, abi_pagesize) | |
2918 | < align_address(lma, abi_pagesize)) | |
2919 | { | |
2920 | // Putting this section in the segment would require | |
2921 | // skipping a page. | |
2922 | need_new_segment = true; | |
2923 | } | |
2924 | else if (is_bss_section(*plast) && !is_bss_section(*p)) | |
2925 | { | |
2926 | // A non-BSS section can not follow a BSS section in the | |
2927 | // same segment. | |
2928 | need_new_segment = true; | |
2929 | } | |
2930 | else if (is_current_seg_readonly | |
af6156ef ILT |
2931 | && ((*p)->flags() & elfcpp::SHF_WRITE) != 0 |
2932 | && !parameters->options().omagic()) | |
a445fddf ILT |
2933 | { |
2934 | // Don't put a writable section in the same segment as a | |
2935 | // non-writable section. | |
2936 | need_new_segment = true; | |
2937 | } | |
2938 | else | |
2939 | { | |
2940 | // Otherwise, reuse the existing segment. | |
2941 | need_new_segment = false; | |
2942 | } | |
2943 | ||
2944 | elfcpp::Elf_Word seg_flags = | |
2945 | Layout::section_flags_to_segment((*p)->flags()); | |
2946 | ||
2947 | if (need_new_segment) | |
2948 | { | |
2949 | current_seg = layout->make_output_segment(elfcpp::PT_LOAD, | |
2950 | seg_flags); | |
2951 | current_seg->set_addresses(vma, lma); | |
2952 | if (first_seg == NULL) | |
2953 | first_seg = current_seg; | |
2954 | is_current_seg_readonly = true; | |
2955 | } | |
2956 | ||
2957 | current_seg->add_output_section(*p, seg_flags); | |
2958 | ||
2959 | if (((*p)->flags() & elfcpp::SHF_WRITE) != 0) | |
2960 | is_current_seg_readonly = false; | |
2961 | ||
2962 | plast = p; | |
2963 | last_vma = vma; | |
2964 | last_lma = lma; | |
2965 | last_size = size; | |
2966 | } | |
2967 | ||
2968 | // An ELF program should work even if the program headers are not in | |
2969 | // a PT_LOAD segment. However, it appears that the Linux kernel | |
2970 | // does not set the AT_PHDR auxiliary entry in that case. It sets | |
2971 | // the load address to p_vaddr - p_offset of the first PT_LOAD | |
2972 | // segment. It then sets AT_PHDR to the load address plus the | |
2973 | // offset to the program headers, e_phoff in the file header. This | |
2974 | // fails when the program headers appear in the file before the | |
2975 | // first PT_LOAD segment. Therefore, we always create a PT_LOAD | |
2976 | // segment to hold the file header and the program headers. This is | |
2977 | // effectively what the GNU linker does, and it is slightly more | |
2978 | // efficient in any case. We try to use the first PT_LOAD segment | |
2979 | // if we can, otherwise we make a new one. | |
2980 | ||
919ed24c ILT |
2981 | if (first_seg == NULL) |
2982 | return NULL; | |
2983 | ||
3ee173de ILT |
2984 | // -n or -N mean that the program is not demand paged and there is |
2985 | // no need to put the program headers in a PT_LOAD segment. | |
2986 | if (parameters->options().nmagic() || parameters->options().omagic()) | |
2987 | return NULL; | |
2988 | ||
1c4f3631 | 2989 | size_t sizeof_headers = this->total_header_size(layout); |
3802b2dd | 2990 | |
919ed24c ILT |
2991 | uint64_t vma = first_seg->vaddr(); |
2992 | uint64_t lma = first_seg->paddr(); | |
2993 | ||
2994 | uint64_t subtract = this->header_size_adjustment(lma, sizeof_headers); | |
2995 | ||
e6188289 ILT |
2996 | if ((lma & (abi_pagesize - 1)) >= sizeof_headers) |
2997 | { | |
2998 | first_seg->set_addresses(vma - subtract, lma - subtract); | |
2999 | return first_seg; | |
3000 | } | |
3001 | ||
919ed24c ILT |
3002 | // If there is no room to squeeze in the headers, then punt. The |
3003 | // resulting executable probably won't run on GNU/Linux, but we | |
3004 | // trust that the user knows what they are doing. | |
3005 | if (lma < subtract || vma < subtract) | |
3006 | return NULL; | |
3007 | ||
a445fddf ILT |
3008 | Output_segment* load_seg = layout->make_output_segment(elfcpp::PT_LOAD, |
3009 | elfcpp::PF_R); | |
919ed24c | 3010 | load_seg->set_addresses(vma - subtract, lma - subtract); |
a445fddf ILT |
3011 | |
3012 | return load_seg; | |
3013 | } | |
3014 | ||
3015 | // Create a PT_NOTE segment for each SHT_NOTE section and a PT_TLS | |
3016 | // segment if there are any SHT_TLS sections. | |
3017 | ||
3018 | void | |
3019 | Script_sections::create_note_and_tls_segments( | |
3020 | Layout* layout, | |
3021 | const Layout::Section_list* sections) | |
3022 | { | |
1c4f3631 ILT |
3023 | gold_assert(!this->saw_phdrs_clause()); |
3024 | ||
a445fddf ILT |
3025 | bool saw_tls = false; |
3026 | for (Layout::Section_list::const_iterator p = sections->begin(); | |
3027 | p != sections->end(); | |
3028 | ++p) | |
3029 | { | |
3030 | if ((*p)->type() == elfcpp::SHT_NOTE) | |
3031 | { | |
3032 | elfcpp::Elf_Word seg_flags = | |
3033 | Layout::section_flags_to_segment((*p)->flags()); | |
3034 | Output_segment* oseg = layout->make_output_segment(elfcpp::PT_NOTE, | |
3035 | seg_flags); | |
3036 | oseg->add_output_section(*p, seg_flags); | |
3037 | ||
3038 | // Incorporate any subsequent SHT_NOTE sections, in the | |
3039 | // hopes that the script is sensible. | |
3040 | Layout::Section_list::const_iterator pnext = p + 1; | |
3041 | while (pnext != sections->end() | |
3042 | && (*pnext)->type() == elfcpp::SHT_NOTE) | |
3043 | { | |
3044 | seg_flags = Layout::section_flags_to_segment((*pnext)->flags()); | |
3045 | oseg->add_output_section(*pnext, seg_flags); | |
3046 | p = pnext; | |
3047 | ++pnext; | |
3048 | } | |
3049 | } | |
3050 | ||
3051 | if (((*p)->flags() & elfcpp::SHF_TLS) != 0) | |
3052 | { | |
3053 | if (saw_tls) | |
3054 | gold_error(_("TLS sections are not adjacent")); | |
3055 | ||
3056 | elfcpp::Elf_Word seg_flags = | |
3057 | Layout::section_flags_to_segment((*p)->flags()); | |
3058 | Output_segment* oseg = layout->make_output_segment(elfcpp::PT_TLS, | |
3059 | seg_flags); | |
3060 | oseg->add_output_section(*p, seg_flags); | |
3061 | ||
3062 | Layout::Section_list::const_iterator pnext = p + 1; | |
3063 | while (pnext != sections->end() | |
3064 | && ((*pnext)->flags() & elfcpp::SHF_TLS) != 0) | |
3065 | { | |
3066 | seg_flags = Layout::section_flags_to_segment((*pnext)->flags()); | |
3067 | oseg->add_output_section(*pnext, seg_flags); | |
3068 | p = pnext; | |
3069 | ++pnext; | |
3070 | } | |
3071 | ||
3072 | saw_tls = true; | |
3073 | } | |
3074 | } | |
3075 | } | |
3076 | ||
1c4f3631 ILT |
3077 | // Add a program header. The PHDRS clause is syntactically distinct |
3078 | // from the SECTIONS clause, but we implement it with the SECTIONS | |
55458500 | 3079 | // support because PHDRS is useless if there is no SECTIONS clause. |
1c4f3631 ILT |
3080 | |
3081 | void | |
3082 | Script_sections::add_phdr(const char* name, size_t namelen, unsigned int type, | |
3083 | bool includes_filehdr, bool includes_phdrs, | |
3084 | bool is_flags_valid, unsigned int flags, | |
3085 | Expression* load_address) | |
3086 | { | |
3087 | if (this->phdrs_elements_ == NULL) | |
3088 | this->phdrs_elements_ = new Phdrs_elements(); | |
3089 | this->phdrs_elements_->push_back(new Phdrs_element(name, namelen, type, | |
3090 | includes_filehdr, | |
3091 | includes_phdrs, | |
3092 | is_flags_valid, flags, | |
3093 | load_address)); | |
3094 | } | |
3095 | ||
3802b2dd ILT |
3096 | // Return the number of segments we expect to create based on the |
3097 | // SECTIONS clause. This is used to implement SIZEOF_HEADERS. | |
3098 | ||
3099 | size_t | |
3100 | Script_sections::expected_segment_count(const Layout* layout) const | |
3101 | { | |
1c4f3631 ILT |
3102 | if (this->saw_phdrs_clause()) |
3103 | return this->phdrs_elements_->size(); | |
3104 | ||
3802b2dd ILT |
3105 | Layout::Section_list sections; |
3106 | layout->get_allocated_sections(§ions); | |
3107 | ||
3108 | // We assume that we will need two PT_LOAD segments. | |
3109 | size_t ret = 2; | |
3110 | ||
3111 | bool saw_note = false; | |
3112 | bool saw_tls = false; | |
3113 | for (Layout::Section_list::const_iterator p = sections.begin(); | |
3114 | p != sections.end(); | |
3115 | ++p) | |
3116 | { | |
3117 | if ((*p)->type() == elfcpp::SHT_NOTE) | |
3118 | { | |
3119 | // Assume that all note sections will fit into a single | |
3120 | // PT_NOTE segment. | |
3121 | if (!saw_note) | |
3122 | { | |
3123 | ++ret; | |
3124 | saw_note = true; | |
3125 | } | |
3126 | } | |
3127 | else if (((*p)->flags() & elfcpp::SHF_TLS) != 0) | |
3128 | { | |
3129 | // There can only be one PT_TLS segment. | |
3130 | if (!saw_tls) | |
3131 | { | |
3132 | ++ret; | |
3133 | saw_tls = true; | |
3134 | } | |
3135 | } | |
3136 | } | |
3137 | ||
3138 | return ret; | |
3139 | } | |
3140 | ||
1c4f3631 ILT |
3141 | // Create the segments from a PHDRS clause. Return the segment which |
3142 | // should hold the file header and program headers, if any. | |
3143 | ||
3144 | Output_segment* | |
3145 | Script_sections::create_segments_from_phdrs_clause(Layout* layout) | |
3146 | { | |
3147 | this->attach_sections_using_phdrs_clause(layout); | |
3148 | return this->set_phdrs_clause_addresses(layout); | |
3149 | } | |
3150 | ||
3151 | // Create the segments from the PHDRS clause, and put the output | |
3152 | // sections in them. | |
3153 | ||
3154 | void | |
3155 | Script_sections::attach_sections_using_phdrs_clause(Layout* layout) | |
3156 | { | |
3157 | typedef std::map<std::string, Output_segment*> Name_to_segment; | |
3158 | Name_to_segment name_to_segment; | |
3159 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); | |
3160 | p != this->phdrs_elements_->end(); | |
3161 | ++p) | |
3162 | name_to_segment[(*p)->name()] = (*p)->create_segment(layout); | |
3163 | ||
3164 | // Walk through the output sections and attach them to segments. | |
3165 | // Output sections in the script which do not list segments are | |
3166 | // attached to the same set of segments as the immediately preceding | |
3167 | // output section. | |
3168 | String_list* phdr_names = NULL; | |
3169 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
3170 | p != this->sections_elements_->end(); | |
3171 | ++p) | |
3172 | { | |
2cefc357 ILT |
3173 | bool orphan; |
3174 | Output_section* os = (*p)->allocate_to_segment(&phdr_names, &orphan); | |
1c4f3631 ILT |
3175 | if (os == NULL) |
3176 | continue; | |
3177 | ||
3178 | if (phdr_names == NULL) | |
3179 | { | |
3180 | gold_error(_("allocated section not in any segment")); | |
3181 | continue; | |
3182 | } | |
3183 | ||
2cefc357 ILT |
3184 | // If this is an orphan section--one that was not explicitly |
3185 | // mentioned in the linker script--then it should not inherit | |
3186 | // any segment type other than PT_LOAD. Otherwise, e.g., the | |
3187 | // PT_INTERP segment will pick up following orphan sections, | |
3188 | // which does not make sense. If this is not an orphan section, | |
3189 | // we trust the linker script. | |
3190 | if (orphan) | |
3191 | { | |
3192 | String_list::iterator q = phdr_names->begin(); | |
3193 | while (q != phdr_names->end()) | |
3194 | { | |
3195 | Name_to_segment::const_iterator r = name_to_segment.find(*q); | |
3196 | // We give errors about unknown segments below. | |
3197 | if (r == name_to_segment.end() | |
3198 | || r->second->type() == elfcpp::PT_LOAD) | |
3199 | ++q; | |
3200 | else | |
3201 | q = phdr_names->erase(q); | |
3202 | } | |
3203 | } | |
3204 | ||
1c4f3631 ILT |
3205 | bool in_load_segment = false; |
3206 | for (String_list::const_iterator q = phdr_names->begin(); | |
3207 | q != phdr_names->end(); | |
3208 | ++q) | |
3209 | { | |
3210 | Name_to_segment::const_iterator r = name_to_segment.find(*q); | |
3211 | if (r == name_to_segment.end()) | |
3212 | gold_error(_("no segment %s"), q->c_str()); | |
3213 | else | |
3214 | { | |
3215 | elfcpp::Elf_Word seg_flags = | |
3216 | Layout::section_flags_to_segment(os->flags()); | |
3217 | r->second->add_output_section(os, seg_flags); | |
3218 | ||
3219 | if (r->second->type() == elfcpp::PT_LOAD) | |
3220 | { | |
3221 | if (in_load_segment) | |
3222 | gold_error(_("section in two PT_LOAD segments")); | |
3223 | in_load_segment = true; | |
3224 | } | |
3225 | } | |
3226 | } | |
3227 | ||
3228 | if (!in_load_segment) | |
3229 | gold_error(_("allocated section not in any PT_LOAD segment")); | |
3230 | } | |
3231 | } | |
3232 | ||
3233 | // Set the addresses for segments created from a PHDRS clause. Return | |
3234 | // the segment which should hold the file header and program headers, | |
3235 | // if any. | |
3236 | ||
3237 | Output_segment* | |
3238 | Script_sections::set_phdrs_clause_addresses(Layout* layout) | |
3239 | { | |
3240 | Output_segment* load_seg = NULL; | |
3241 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); | |
3242 | p != this->phdrs_elements_->end(); | |
3243 | ++p) | |
3244 | { | |
3245 | // Note that we have to set the flags after adding the output | |
3246 | // sections to the segment, as adding an output segment can | |
3247 | // change the flags. | |
3248 | (*p)->set_flags_if_valid(); | |
3249 | ||
3250 | Output_segment* oseg = (*p)->segment(); | |
3251 | ||
3252 | if (oseg->type() != elfcpp::PT_LOAD) | |
3253 | { | |
3254 | // The addresses of non-PT_LOAD segments are set from the | |
3255 | // PT_LOAD segments. | |
3256 | if ((*p)->has_load_address()) | |
3257 | gold_error(_("may only specify load address for PT_LOAD segment")); | |
3258 | continue; | |
3259 | } | |
3260 | ||
3261 | // The output sections should have addresses from the SECTIONS | |
3262 | // clause. The addresses don't have to be in order, so find the | |
3263 | // one with the lowest load address. Use that to set the | |
3264 | // address of the segment. | |
3265 | ||
3266 | Output_section* osec = oseg->section_with_lowest_load_address(); | |
3267 | if (osec == NULL) | |
3268 | { | |
3269 | oseg->set_addresses(0, 0); | |
3270 | continue; | |
3271 | } | |
3272 | ||
3273 | uint64_t vma = osec->address(); | |
3274 | uint64_t lma = osec->has_load_address() ? osec->load_address() : vma; | |
3275 | ||
3276 | // Override the load address of the section with the load | |
3277 | // address specified for the segment. | |
3278 | if ((*p)->has_load_address()) | |
3279 | { | |
3280 | if (osec->has_load_address()) | |
3281 | gold_warning(_("PHDRS load address overrides " | |
3282 | "section %s load address"), | |
3283 | osec->name()); | |
3284 | ||
3285 | lma = (*p)->load_address(); | |
3286 | } | |
3287 | ||
3288 | bool headers = (*p)->includes_filehdr() && (*p)->includes_phdrs(); | |
3289 | if (!headers && ((*p)->includes_filehdr() || (*p)->includes_phdrs())) | |
3290 | { | |
3291 | // We could support this if we wanted to. | |
3292 | gold_error(_("using only one of FILEHDR and PHDRS is " | |
3293 | "not currently supported")); | |
3294 | } | |
3295 | if (headers) | |
3296 | { | |
3297 | size_t sizeof_headers = this->total_header_size(layout); | |
3298 | uint64_t subtract = this->header_size_adjustment(lma, | |
3299 | sizeof_headers); | |
3300 | if (lma >= subtract && vma >= subtract) | |
3301 | { | |
3302 | lma -= subtract; | |
3303 | vma -= subtract; | |
3304 | } | |
3305 | else | |
3306 | { | |
3307 | gold_error(_("sections loaded on first page without room " | |
3308 | "for file and program headers " | |
3309 | "are not supported")); | |
3310 | } | |
3311 | ||
3312 | if (load_seg != NULL) | |
3313 | gold_error(_("using FILEHDR and PHDRS on more than one " | |
3314 | "PT_LOAD segment is not currently supported")); | |
3315 | load_seg = oseg; | |
3316 | } | |
3317 | ||
3318 | oseg->set_addresses(vma, lma); | |
3319 | } | |
3320 | ||
3321 | return load_seg; | |
3322 | } | |
3323 | ||
3324 | // Add the file header and segment headers to non-load segments | |
3325 | // specified in the PHDRS clause. | |
3326 | ||
3327 | void | |
3328 | Script_sections::put_headers_in_phdrs(Output_data* file_header, | |
3329 | Output_data* segment_headers) | |
3330 | { | |
3331 | gold_assert(this->saw_phdrs_clause()); | |
3332 | for (Phdrs_elements::iterator p = this->phdrs_elements_->begin(); | |
3333 | p != this->phdrs_elements_->end(); | |
3334 | ++p) | |
3335 | { | |
3336 | if ((*p)->type() != elfcpp::PT_LOAD) | |
3337 | { | |
3338 | if ((*p)->includes_phdrs()) | |
3339 | (*p)->segment()->add_initial_output_data(segment_headers); | |
3340 | if ((*p)->includes_filehdr()) | |
3341 | (*p)->segment()->add_initial_output_data(file_header); | |
3342 | } | |
3343 | } | |
3344 | } | |
3345 | ||
8f2eb564 ILT |
3346 | // Look for an output section by name and return the address, the load |
3347 | // address, the alignment, and the size. This is used when an | |
3348 | // expression refers to an output section which was not actually | |
3349 | // created. This returns true if the section was found, false | |
3350 | // otherwise. | |
3351 | ||
3352 | bool | |
3353 | Script_sections::get_output_section_info(const char* name, uint64_t* address, | |
3354 | uint64_t* load_address, | |
3355 | uint64_t* addralign, | |
3356 | uint64_t* size) const | |
3357 | { | |
3358 | if (!this->saw_sections_clause_) | |
3359 | return false; | |
3360 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
3361 | p != this->sections_elements_->end(); | |
3362 | ++p) | |
3363 | if ((*p)->get_output_section_info(name, address, load_address, addralign, | |
3364 | size)) | |
3365 | return true; | |
3366 | return false; | |
3367 | } | |
3368 | ||
494e05f4 ILT |
3369 | // Print the SECTIONS clause to F for debugging. |
3370 | ||
3371 | void | |
3372 | Script_sections::print(FILE* f) const | |
3373 | { | |
3374 | if (!this->saw_sections_clause_) | |
3375 | return; | |
3376 | ||
3377 | fprintf(f, "SECTIONS {\n"); | |
3378 | ||
3379 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
3380 | p != this->sections_elements_->end(); | |
3381 | ++p) | |
3382 | (*p)->print(f); | |
3383 | ||
3384 | fprintf(f, "}\n"); | |
7d26c6cc ILT |
3385 | |
3386 | if (this->phdrs_elements_ != NULL) | |
3387 | { | |
3388 | fprintf(f, "PHDRS {\n"); | |
3389 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); | |
3390 | p != this->phdrs_elements_->end(); | |
3391 | ++p) | |
3392 | (*p)->print(f); | |
3393 | fprintf(f, "}\n"); | |
3394 | } | |
494e05f4 ILT |
3395 | } |
3396 | ||
3397 | } // End namespace gold. |