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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, | |
6c93b22c ILT |
88 | PLACE_TLS, |
89 | PLACE_TLS_BSS, | |
0d371ad3 ILT |
90 | PLACE_BSS, |
91 | PLACE_REL, | |
92 | PLACE_INTERP, | |
93 | PLACE_NONALLOC, | |
94 | PLACE_LAST, | |
95 | PLACE_MAX | |
96 | }; | |
97 | ||
98 | // The information we keep for a specific place. | |
99 | struct Place | |
100 | { | |
101 | // The name of sections for this place. | |
102 | const char* name; | |
103 | // Whether we have a location for this place. | |
104 | bool have_location; | |
105 | // The iterator for this place. | |
106 | Elements_iterator location; | |
107 | }; | |
108 | ||
109 | // Initialize one place element. | |
110 | void | |
111 | initialize_place(Place_index, const char*); | |
112 | ||
113 | // The places. | |
114 | Place places_[PLACE_MAX]; | |
115 | // True if this is the first call to output_section_init. | |
116 | bool first_init_; | |
117 | }; | |
118 | ||
119 | // Initialize Orphan_section_placement. | |
120 | ||
121 | Orphan_section_placement::Orphan_section_placement() | |
122 | : first_init_(true) | |
123 | { | |
124 | this->initialize_place(PLACE_TEXT, ".text"); | |
125 | this->initialize_place(PLACE_RODATA, ".rodata"); | |
126 | this->initialize_place(PLACE_DATA, ".data"); | |
6c93b22c ILT |
127 | this->initialize_place(PLACE_TLS, NULL); |
128 | this->initialize_place(PLACE_TLS_BSS, NULL); | |
0d371ad3 ILT |
129 | this->initialize_place(PLACE_BSS, ".bss"); |
130 | this->initialize_place(PLACE_REL, NULL); | |
131 | this->initialize_place(PLACE_INTERP, ".interp"); | |
132 | this->initialize_place(PLACE_NONALLOC, NULL); | |
133 | this->initialize_place(PLACE_LAST, NULL); | |
134 | } | |
135 | ||
136 | // Initialize one place element. | |
137 | ||
138 | void | |
139 | Orphan_section_placement::initialize_place(Place_index index, const char* name) | |
140 | { | |
141 | this->places_[index].name = name; | |
142 | this->places_[index].have_location = false; | |
143 | } | |
144 | ||
145 | // While initializing the Orphan_section_placement information, this | |
146 | // is called once for each output section named in the linker script. | |
147 | // If we found an output section during the link, it will be passed in | |
148 | // OS. | |
149 | ||
150 | void | |
151 | Orphan_section_placement::output_section_init(const std::string& name, | |
152 | Output_section* os, | |
153 | Elements_iterator location) | |
154 | { | |
155 | bool first_init = this->first_init_; | |
156 | this->first_init_ = false; | |
157 | ||
158 | for (int i = 0; i < PLACE_MAX; ++i) | |
159 | { | |
160 | if (this->places_[i].name != NULL && this->places_[i].name == name) | |
161 | { | |
162 | if (this->places_[i].have_location) | |
163 | { | |
164 | // We have already seen a section with this name. | |
165 | return; | |
166 | } | |
167 | ||
168 | this->places_[i].location = location; | |
169 | this->places_[i].have_location = true; | |
170 | ||
171 | // If we just found the .bss section, restart the search for | |
172 | // an unallocated section. This follows the GNU linker's | |
173 | // behaviour. | |
174 | if (i == PLACE_BSS) | |
175 | this->places_[PLACE_NONALLOC].have_location = false; | |
176 | ||
177 | return; | |
178 | } | |
179 | } | |
180 | ||
181 | // Relocation sections. | |
182 | if (!this->places_[PLACE_REL].have_location | |
183 | && os != NULL | |
184 | && (os->type() == elfcpp::SHT_REL || os->type() == elfcpp::SHT_RELA) | |
185 | && (os->flags() & elfcpp::SHF_ALLOC) != 0) | |
186 | { | |
187 | this->places_[PLACE_REL].location = location; | |
188 | this->places_[PLACE_REL].have_location = true; | |
189 | } | |
190 | ||
191 | // We find the location for unallocated sections by finding the | |
192 | // first debugging or comment section after the BSS section (if | |
193 | // there is one). | |
194 | if (!this->places_[PLACE_NONALLOC].have_location | |
195 | && (name == ".comment" || Layout::is_debug_info_section(name.c_str()))) | |
196 | { | |
197 | // We add orphan sections after the location in PLACES_. We | |
198 | // want to store unallocated sections before LOCATION. If this | |
199 | // is the very first section, we can't use it. | |
200 | if (!first_init) | |
201 | { | |
202 | --location; | |
203 | this->places_[PLACE_NONALLOC].location = location; | |
204 | this->places_[PLACE_NONALLOC].have_location = true; | |
205 | } | |
206 | } | |
207 | } | |
208 | ||
209 | // Initialize the last location. | |
210 | ||
211 | void | |
212 | Orphan_section_placement::last_init(Elements_iterator location) | |
213 | { | |
214 | this->places_[PLACE_LAST].location = location; | |
215 | this->places_[PLACE_LAST].have_location = true; | |
216 | } | |
217 | ||
218 | // Set *PWHERE to the address of an iterator pointing to the location | |
219 | // to use for an orphan section. Return true if the iterator has a | |
220 | // value, false otherwise. | |
221 | ||
222 | bool | |
223 | Orphan_section_placement::find_place(Output_section* os, | |
224 | Elements_iterator** pwhere) | |
225 | { | |
226 | // Figure out where OS should go. This is based on the GNU linker | |
227 | // code. FIXME: The GNU linker handles small data sections | |
228 | // specially, but we don't. | |
229 | elfcpp::Elf_Word type = os->type(); | |
230 | elfcpp::Elf_Xword flags = os->flags(); | |
231 | Place_index index; | |
232 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
233 | && !Layout::is_debug_info_section(os->name())) | |
234 | index = PLACE_NONALLOC; | |
235 | else if ((flags & elfcpp::SHF_ALLOC) == 0) | |
236 | index = PLACE_LAST; | |
237 | else if (type == elfcpp::SHT_NOTE) | |
238 | index = PLACE_INTERP; | |
6c93b22c ILT |
239 | else if ((flags & elfcpp::SHF_TLS) != 0) |
240 | { | |
241 | if (type == elfcpp::SHT_NOBITS) | |
242 | index = PLACE_TLS_BSS; | |
243 | else | |
244 | index = PLACE_TLS; | |
245 | } | |
0d371ad3 ILT |
246 | else if (type == elfcpp::SHT_NOBITS) |
247 | index = PLACE_BSS; | |
248 | else if ((flags & elfcpp::SHF_WRITE) != 0) | |
249 | index = PLACE_DATA; | |
250 | else if (type == elfcpp::SHT_REL || type == elfcpp::SHT_RELA) | |
251 | index = PLACE_REL; | |
252 | else if ((flags & elfcpp::SHF_EXECINSTR) == 0) | |
253 | index = PLACE_RODATA; | |
254 | else | |
255 | index = PLACE_TEXT; | |
256 | ||
257 | // If we don't have a location yet, try to find one based on a | |
258 | // plausible ordering of sections. | |
259 | if (!this->places_[index].have_location) | |
260 | { | |
261 | Place_index follow; | |
262 | switch (index) | |
263 | { | |
264 | default: | |
265 | follow = PLACE_MAX; | |
266 | break; | |
267 | case PLACE_RODATA: | |
268 | follow = PLACE_TEXT; | |
269 | break; | |
270 | case PLACE_BSS: | |
271 | follow = PLACE_DATA; | |
272 | break; | |
273 | case PLACE_REL: | |
274 | follow = PLACE_TEXT; | |
275 | break; | |
276 | case PLACE_INTERP: | |
277 | follow = PLACE_TEXT; | |
278 | break; | |
6c93b22c ILT |
279 | case PLACE_TLS: |
280 | follow = PLACE_DATA; | |
281 | break; | |
282 | case PLACE_TLS_BSS: | |
283 | follow = PLACE_TLS; | |
284 | if (!this->places_[PLACE_TLS].have_location) | |
285 | follow = PLACE_DATA; | |
286 | break; | |
0d371ad3 ILT |
287 | } |
288 | if (follow != PLACE_MAX && this->places_[follow].have_location) | |
289 | { | |
290 | // Set the location of INDEX to the location of FOLLOW. The | |
291 | // location of INDEX will then be incremented by the caller, | |
292 | // so anything in INDEX will continue to be after anything | |
293 | // in FOLLOW. | |
294 | this->places_[index].location = this->places_[follow].location; | |
295 | this->places_[index].have_location = true; | |
296 | } | |
297 | } | |
298 | ||
299 | *pwhere = &this->places_[index].location; | |
300 | bool ret = this->places_[index].have_location; | |
301 | ||
302 | // The caller will set the location. | |
303 | this->places_[index].have_location = true; | |
304 | ||
305 | return ret; | |
306 | } | |
307 | ||
308 | // Return the iterator being used for sections at the very end of the | |
309 | // linker script. | |
310 | ||
311 | Orphan_section_placement::Elements_iterator | |
312 | Orphan_section_placement::last_place() const | |
313 | { | |
314 | gold_assert(this->places_[PLACE_LAST].have_location); | |
315 | return this->places_[PLACE_LAST].location; | |
316 | } | |
317 | ||
494e05f4 ILT |
318 | // An element in a SECTIONS clause. |
319 | ||
320 | class Sections_element | |
321 | { | |
322 | public: | |
323 | Sections_element() | |
324 | { } | |
325 | ||
326 | virtual ~Sections_element() | |
327 | { } | |
328 | ||
0d371ad3 ILT |
329 | // Return whether an output section is relro. |
330 | virtual bool | |
331 | is_relro() const | |
332 | { return false; } | |
333 | ||
2d924fd9 ILT |
334 | // Record that an output section is relro. |
335 | virtual void | |
336 | set_is_relro() | |
337 | { } | |
338 | ||
919ed24c ILT |
339 | // Create any required output sections. The only real |
340 | // implementation is in Output_section_definition. | |
341 | virtual void | |
342 | create_sections(Layout*) | |
343 | { } | |
344 | ||
a445fddf ILT |
345 | // Add any symbol being defined to the symbol table. |
346 | virtual void | |
347 | add_symbols_to_table(Symbol_table*) | |
348 | { } | |
349 | ||
350 | // Finalize symbols and check assertions. | |
351 | virtual void | |
77e65537 | 352 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*) |
a445fddf ILT |
353 | { } |
354 | ||
355 | // Return the output section name to use for an input file name and | |
356 | // section name. This only real implementation is in | |
357 | // Output_section_definition. | |
358 | virtual const char* | |
1e5d2fb1 DK |
359 | output_section_name(const char*, const char*, Output_section***, |
360 | Script_sections::Section_type*) | |
a445fddf ILT |
361 | { return NULL; } |
362 | ||
0d371ad3 ILT |
363 | // Initialize OSP with an output section. |
364 | virtual void | |
365 | orphan_section_init(Orphan_section_placement*, | |
366 | Script_sections::Elements_iterator) | |
367 | { } | |
a445fddf ILT |
368 | |
369 | // Set section addresses. This includes applying assignments if the | |
370 | // the expression is an absolute value. | |
371 | virtual void | |
fd247bfe | 372 | set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*) |
a445fddf ILT |
373 | { } |
374 | ||
3802b2dd ILT |
375 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
376 | // this section is constrained, and the input sections do not match, | |
377 | // return the constraint, and set *POSD. | |
378 | virtual Section_constraint | |
379 | check_constraint(Output_section_definition**) | |
380 | { return CONSTRAINT_NONE; } | |
381 | ||
382 | // See if this is the alternate output section for a constrained | |
383 | // output section. If it is, transfer the Output_section and return | |
384 | // true. Otherwise return false. | |
385 | virtual bool | |
386 | alternate_constraint(Output_section_definition*, Section_constraint) | |
387 | { return false; } | |
388 | ||
1c4f3631 ILT |
389 | // Get the list of segments to use for an allocated section when |
390 | // using a PHDRS clause. If this is an allocated section, return | |
2cefc357 ILT |
391 | // the Output_section, and set *PHDRS_LIST (the first parameter) to |
392 | // the list of PHDRS to which it should be attached. If the PHDRS | |
393 | // were not specified, don't change *PHDRS_LIST. When not returning | |
394 | // NULL, set *ORPHAN (the second parameter) according to whether | |
395 | // this is an orphan section--one that is not mentioned in the | |
396 | // linker script. | |
1c4f3631 | 397 | virtual Output_section* |
2cefc357 | 398 | allocate_to_segment(String_list**, bool*) |
1c4f3631 ILT |
399 | { return NULL; } |
400 | ||
8f2eb564 ILT |
401 | // Look for an output section by name and return the address, the |
402 | // load address, the alignment, and the size. This is used when an | |
403 | // expression refers to an output section which was not actually | |
404 | // created. This returns true if the section was found, false | |
405 | // otherwise. The only real definition is for | |
406 | // Output_section_definition. | |
407 | virtual bool | |
408 | get_output_section_info(const char*, uint64_t*, uint64_t*, uint64_t*, | |
409 | uint64_t*) const | |
410 | { return false; } | |
411 | ||
2d924fd9 ILT |
412 | // Return the associated Output_section if there is one. |
413 | virtual Output_section* | |
414 | get_output_section() const | |
415 | { return NULL; } | |
416 | ||
a445fddf | 417 | // Print the element for debugging purposes. |
494e05f4 ILT |
418 | virtual void |
419 | print(FILE* f) const = 0; | |
420 | }; | |
421 | ||
422 | // An assignment in a SECTIONS clause outside of an output section. | |
423 | ||
424 | class Sections_element_assignment : public Sections_element | |
425 | { | |
426 | public: | |
427 | Sections_element_assignment(const char* name, size_t namelen, | |
428 | Expression* val, bool provide, bool hidden) | |
99fff23b | 429 | : assignment_(name, namelen, false, val, provide, hidden) |
494e05f4 ILT |
430 | { } |
431 | ||
a445fddf ILT |
432 | // Add the symbol to the symbol table. |
433 | void | |
434 | add_symbols_to_table(Symbol_table* symtab) | |
435 | { this->assignment_.add_to_table(symtab); } | |
436 | ||
437 | // Finalize the symbol. | |
438 | void | |
439 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 440 | uint64_t* dot_value) |
a445fddf | 441 | { |
77e65537 | 442 | this->assignment_.finalize_with_dot(symtab, layout, *dot_value, NULL); |
a445fddf ILT |
443 | } |
444 | ||
445 | // Set the section address. There is no section here, but if the | |
446 | // value is absolute, we set the symbol. This permits us to use | |
447 | // absolute symbols when setting dot. | |
448 | void | |
449 | set_section_addresses(Symbol_table* symtab, Layout* layout, | |
fd247bfe | 450 | uint64_t* dot_value, uint64_t*) |
a445fddf | 451 | { |
77e65537 | 452 | this->assignment_.set_if_absolute(symtab, layout, true, *dot_value); |
a445fddf ILT |
453 | } |
454 | ||
455 | // Print for debugging. | |
494e05f4 ILT |
456 | void |
457 | print(FILE* f) const | |
458 | { | |
459 | fprintf(f, " "); | |
460 | this->assignment_.print(f); | |
461 | } | |
462 | ||
463 | private: | |
464 | Symbol_assignment assignment_; | |
465 | }; | |
466 | ||
a445fddf ILT |
467 | // An assignment to the dot symbol in a SECTIONS clause outside of an |
468 | // output section. | |
469 | ||
470 | class Sections_element_dot_assignment : public Sections_element | |
471 | { | |
472 | public: | |
473 | Sections_element_dot_assignment(Expression* val) | |
474 | : val_(val) | |
475 | { } | |
476 | ||
477 | // Finalize the symbol. | |
478 | void | |
479 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 480 | uint64_t* dot_value) |
a445fddf | 481 | { |
77e65537 ILT |
482 | // We ignore the section of the result because outside of an |
483 | // output section definition the dot symbol is always considered | |
484 | // to be absolute. | |
485 | Output_section* dummy; | |
919ed24c | 486 | *dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 | 487 | NULL, &dummy); |
a445fddf ILT |
488 | } |
489 | ||
490 | // Update the dot symbol while setting section addresses. | |
491 | void | |
492 | set_section_addresses(Symbol_table* symtab, Layout* layout, | |
fd247bfe | 493 | uint64_t* dot_value, uint64_t* load_address) |
a445fddf | 494 | { |
77e65537 | 495 | Output_section* dummy; |
919ed24c | 496 | *dot_value = this->val_->eval_with_dot(symtab, layout, false, *dot_value, |
77e65537 | 497 | NULL, &dummy); |
fd247bfe | 498 | *load_address = *dot_value; |
a445fddf ILT |
499 | } |
500 | ||
501 | // Print for debugging. | |
502 | void | |
503 | print(FILE* f) const | |
504 | { | |
505 | fprintf(f, " . = "); | |
506 | this->val_->print(f); | |
507 | fprintf(f, "\n"); | |
508 | } | |
509 | ||
510 | private: | |
511 | Expression* val_; | |
512 | }; | |
513 | ||
494e05f4 ILT |
514 | // An assertion in a SECTIONS clause outside of an output section. |
515 | ||
516 | class Sections_element_assertion : public Sections_element | |
517 | { | |
518 | public: | |
519 | Sections_element_assertion(Expression* check, const char* message, | |
520 | size_t messagelen) | |
521 | : assertion_(check, message, messagelen) | |
522 | { } | |
523 | ||
a445fddf ILT |
524 | // Check the assertion. |
525 | void | |
77e65537 | 526 | finalize_symbols(Symbol_table* symtab, const Layout* layout, uint64_t*) |
a445fddf ILT |
527 | { this->assertion_.check(symtab, layout); } |
528 | ||
529 | // Print for debugging. | |
494e05f4 ILT |
530 | void |
531 | print(FILE* f) const | |
532 | { | |
533 | fprintf(f, " "); | |
534 | this->assertion_.print(f); | |
535 | } | |
536 | ||
537 | private: | |
538 | Script_assertion assertion_; | |
539 | }; | |
540 | ||
541 | // An element in an output section in a SECTIONS clause. | |
542 | ||
543 | class Output_section_element | |
544 | { | |
545 | public: | |
a445fddf | 546 | // A list of input sections. |
20e6d0d6 | 547 | typedef std::list<Output_section::Simple_input_section> Input_section_list; |
a445fddf | 548 | |
494e05f4 ILT |
549 | Output_section_element() |
550 | { } | |
551 | ||
552 | virtual ~Output_section_element() | |
553 | { } | |
554 | ||
919ed24c ILT |
555 | // Return whether this element requires an output section to exist. |
556 | virtual bool | |
557 | needs_output_section() const | |
558 | { return false; } | |
559 | ||
a445fddf ILT |
560 | // Add any symbol being defined to the symbol table. |
561 | virtual void | |
562 | add_symbols_to_table(Symbol_table*) | |
563 | { } | |
564 | ||
565 | // Finalize symbols and check assertions. | |
566 | virtual void | |
77e65537 | 567 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*, Output_section**) |
a445fddf ILT |
568 | { } |
569 | ||
570 | // Return whether this element matches FILE_NAME and SECTION_NAME. | |
571 | // The only real implementation is in Output_section_element_input. | |
572 | virtual bool | |
573 | match_name(const char*, const char*) const | |
574 | { return false; } | |
575 | ||
576 | // Set section addresses. This includes applying assignments if the | |
577 | // the expression is an absolute value. | |
578 | virtual void | |
579 | set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t, | |
77e65537 ILT |
580 | uint64_t*, Output_section**, std::string*, |
581 | Input_section_list*) | |
a445fddf ILT |
582 | { } |
583 | ||
584 | // Print the element for debugging purposes. | |
494e05f4 ILT |
585 | virtual void |
586 | print(FILE* f) const = 0; | |
a445fddf ILT |
587 | |
588 | protected: | |
589 | // Return a fill string that is LENGTH bytes long, filling it with | |
590 | // FILL. | |
591 | std::string | |
592 | get_fill_string(const std::string* fill, section_size_type length) const; | |
494e05f4 ILT |
593 | }; |
594 | ||
a445fddf ILT |
595 | std::string |
596 | Output_section_element::get_fill_string(const std::string* fill, | |
597 | section_size_type length) const | |
598 | { | |
599 | std::string this_fill; | |
600 | this_fill.reserve(length); | |
601 | while (this_fill.length() + fill->length() <= length) | |
602 | this_fill += *fill; | |
603 | if (this_fill.length() < length) | |
604 | this_fill.append(*fill, 0, length - this_fill.length()); | |
605 | return this_fill; | |
606 | } | |
607 | ||
494e05f4 ILT |
608 | // A symbol assignment in an output section. |
609 | ||
610 | class Output_section_element_assignment : public Output_section_element | |
611 | { | |
612 | public: | |
613 | Output_section_element_assignment(const char* name, size_t namelen, | |
614 | Expression* val, bool provide, | |
615 | bool hidden) | |
99fff23b | 616 | : assignment_(name, namelen, false, val, provide, hidden) |
494e05f4 ILT |
617 | { } |
618 | ||
a445fddf ILT |
619 | // Add the symbol to the symbol table. |
620 | void | |
621 | add_symbols_to_table(Symbol_table* symtab) | |
622 | { this->assignment_.add_to_table(symtab); } | |
623 | ||
624 | // Finalize the symbol. | |
625 | void | |
626 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 627 | uint64_t* dot_value, Output_section** dot_section) |
a445fddf | 628 | { |
77e65537 ILT |
629 | this->assignment_.finalize_with_dot(symtab, layout, *dot_value, |
630 | *dot_section); | |
a445fddf ILT |
631 | } |
632 | ||
633 | // Set the section address. There is no section here, but if the | |
634 | // value is absolute, we set the symbol. This permits us to use | |
635 | // absolute symbols when setting dot. | |
636 | void | |
637 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
77e65537 ILT |
638 | uint64_t, uint64_t* dot_value, Output_section**, |
639 | std::string*, Input_section_list*) | |
a445fddf | 640 | { |
77e65537 | 641 | this->assignment_.set_if_absolute(symtab, layout, true, *dot_value); |
a445fddf ILT |
642 | } |
643 | ||
644 | // Print for debugging. | |
494e05f4 ILT |
645 | void |
646 | print(FILE* f) const | |
647 | { | |
648 | fprintf(f, " "); | |
649 | this->assignment_.print(f); | |
650 | } | |
651 | ||
652 | private: | |
653 | Symbol_assignment assignment_; | |
654 | }; | |
655 | ||
a445fddf ILT |
656 | // An assignment to the dot symbol in an output section. |
657 | ||
658 | class Output_section_element_dot_assignment : public Output_section_element | |
659 | { | |
660 | public: | |
661 | Output_section_element_dot_assignment(Expression* val) | |
662 | : val_(val) | |
663 | { } | |
664 | ||
665 | // Finalize the symbol. | |
666 | void | |
667 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 668 | uint64_t* dot_value, Output_section** dot_section) |
a445fddf | 669 | { |
919ed24c | 670 | *dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 | 671 | *dot_section, dot_section); |
a445fddf ILT |
672 | } |
673 | ||
674 | // Update the dot symbol while setting section addresses. | |
675 | void | |
676 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
77e65537 ILT |
677 | uint64_t, uint64_t* dot_value, Output_section**, |
678 | std::string*, Input_section_list*); | |
a445fddf ILT |
679 | |
680 | // Print for debugging. | |
681 | void | |
682 | print(FILE* f) const | |
683 | { | |
684 | fprintf(f, " . = "); | |
685 | this->val_->print(f); | |
686 | fprintf(f, "\n"); | |
687 | } | |
688 | ||
689 | private: | |
690 | Expression* val_; | |
691 | }; | |
692 | ||
693 | // Update the dot symbol while setting section addresses. | |
694 | ||
695 | void | |
696 | Output_section_element_dot_assignment::set_section_addresses( | |
697 | Symbol_table* symtab, | |
698 | Layout* layout, | |
699 | Output_section* output_section, | |
700 | uint64_t, | |
701 | uint64_t* dot_value, | |
77e65537 | 702 | Output_section** dot_section, |
a445fddf ILT |
703 | std::string* fill, |
704 | Input_section_list*) | |
705 | { | |
919ed24c ILT |
706 | uint64_t next_dot = this->val_->eval_with_dot(symtab, layout, false, |
707 | *dot_value, *dot_section, | |
708 | dot_section); | |
a445fddf ILT |
709 | if (next_dot < *dot_value) |
710 | gold_error(_("dot may not move backward")); | |
711 | if (next_dot > *dot_value && output_section != NULL) | |
712 | { | |
713 | section_size_type length = convert_to_section_size_type(next_dot | |
714 | - *dot_value); | |
715 | Output_section_data* posd; | |
716 | if (fill->empty()) | |
7d9e3d98 | 717 | posd = new Output_data_zero_fill(length, 0); |
a445fddf ILT |
718 | else |
719 | { | |
720 | std::string this_fill = this->get_fill_string(fill, length); | |
721 | posd = new Output_data_const(this_fill, 0); | |
722 | } | |
723 | output_section->add_output_section_data(posd); | |
20e6d0d6 | 724 | layout->new_output_section_data_from_script(posd); |
a445fddf ILT |
725 | } |
726 | *dot_value = next_dot; | |
727 | } | |
728 | ||
494e05f4 ILT |
729 | // An assertion in an output section. |
730 | ||
731 | class Output_section_element_assertion : public Output_section_element | |
732 | { | |
733 | public: | |
734 | Output_section_element_assertion(Expression* check, const char* message, | |
735 | size_t messagelen) | |
736 | : assertion_(check, message, messagelen) | |
737 | { } | |
738 | ||
739 | void | |
740 | print(FILE* f) const | |
741 | { | |
742 | fprintf(f, " "); | |
743 | this->assertion_.print(f); | |
744 | } | |
745 | ||
746 | private: | |
747 | Script_assertion assertion_; | |
748 | }; | |
749 | ||
77e65537 ILT |
750 | // We use a special instance of Output_section_data to handle BYTE, |
751 | // SHORT, etc. This permits forward references to symbols in the | |
752 | // expressions. | |
494e05f4 | 753 | |
77e65537 | 754 | class Output_data_expression : public Output_section_data |
494e05f4 ILT |
755 | { |
756 | public: | |
77e65537 ILT |
757 | Output_data_expression(int size, bool is_signed, Expression* val, |
758 | const Symbol_table* symtab, const Layout* layout, | |
759 | uint64_t dot_value, Output_section* dot_section) | |
20e6d0d6 | 760 | : Output_section_data(size, 0, true), |
77e65537 ILT |
761 | is_signed_(is_signed), val_(val), symtab_(symtab), |
762 | layout_(layout), dot_value_(dot_value), dot_section_(dot_section) | |
494e05f4 ILT |
763 | { } |
764 | ||
77e65537 ILT |
765 | protected: |
766 | // Write the data to the output file. | |
a445fddf | 767 | void |
77e65537 | 768 | do_write(Output_file*); |
a445fddf | 769 | |
77e65537 | 770 | // Write the data to a buffer. |
494e05f4 | 771 | void |
77e65537 | 772 | do_write_to_buffer(unsigned char*); |
494e05f4 | 773 | |
7d9e3d98 ILT |
774 | // Write to a map file. |
775 | void | |
776 | do_print_to_mapfile(Mapfile* mapfile) const | |
777 | { mapfile->print_output_data(this, _("** expression")); } | |
778 | ||
494e05f4 | 779 | private: |
a445fddf | 780 | template<bool big_endian> |
77e65537 ILT |
781 | void |
782 | endian_write_to_buffer(uint64_t, unsigned char*); | |
a445fddf | 783 | |
494e05f4 | 784 | bool is_signed_; |
494e05f4 | 785 | Expression* val_; |
77e65537 ILT |
786 | const Symbol_table* symtab_; |
787 | const Layout* layout_; | |
788 | uint64_t dot_value_; | |
789 | Output_section* dot_section_; | |
494e05f4 ILT |
790 | }; |
791 | ||
77e65537 | 792 | // Write the data element to the output file. |
a445fddf ILT |
793 | |
794 | void | |
77e65537 | 795 | Output_data_expression::do_write(Output_file* of) |
a445fddf | 796 | { |
77e65537 ILT |
797 | unsigned char* view = of->get_output_view(this->offset(), this->data_size()); |
798 | this->write_to_buffer(view); | |
799 | of->write_output_view(this->offset(), this->data_size(), view); | |
800 | } | |
a445fddf | 801 | |
77e65537 ILT |
802 | // Write the data element to a buffer. |
803 | ||
804 | void | |
805 | Output_data_expression::do_write_to_buffer(unsigned char* buf) | |
806 | { | |
807 | Output_section* dummy; | |
808 | uint64_t val = this->val_->eval_with_dot(this->symtab_, this->layout_, | |
919ed24c | 809 | true, this->dot_value_, |
77e65537 | 810 | this->dot_section_, &dummy); |
a445fddf | 811 | |
8851ecca | 812 | if (parameters->target().is_big_endian()) |
77e65537 | 813 | this->endian_write_to_buffer<true>(val, buf); |
a445fddf | 814 | else |
77e65537 | 815 | this->endian_write_to_buffer<false>(val, buf); |
a445fddf ILT |
816 | } |
817 | ||
a445fddf | 818 | template<bool big_endian> |
77e65537 ILT |
819 | void |
820 | Output_data_expression::endian_write_to_buffer(uint64_t val, | |
821 | unsigned char* buf) | |
a445fddf | 822 | { |
77e65537 | 823 | switch (this->data_size()) |
a445fddf ILT |
824 | { |
825 | case 1: | |
826 | elfcpp::Swap_unaligned<8, big_endian>::writeval(buf, val); | |
a445fddf ILT |
827 | break; |
828 | case 2: | |
829 | elfcpp::Swap_unaligned<16, big_endian>::writeval(buf, val); | |
a445fddf ILT |
830 | break; |
831 | case 4: | |
832 | elfcpp::Swap_unaligned<32, big_endian>::writeval(buf, val); | |
a445fddf ILT |
833 | break; |
834 | case 8: | |
8851ecca | 835 | if (parameters->target().get_size() == 32) |
a445fddf ILT |
836 | { |
837 | val &= 0xffffffff; | |
838 | if (this->is_signed_ && (val & 0x80000000) != 0) | |
839 | val |= 0xffffffff00000000LL; | |
840 | } | |
841 | elfcpp::Swap_unaligned<64, big_endian>::writeval(buf, val); | |
a445fddf ILT |
842 | break; |
843 | default: | |
844 | gold_unreachable(); | |
845 | } | |
77e65537 ILT |
846 | } |
847 | ||
848 | // A data item in an output section. | |
849 | ||
850 | class Output_section_element_data : public Output_section_element | |
851 | { | |
852 | public: | |
853 | Output_section_element_data(int size, bool is_signed, Expression* val) | |
854 | : size_(size), is_signed_(is_signed), val_(val) | |
855 | { } | |
856 | ||
919ed24c ILT |
857 | // If there is a data item, then we must create an output section. |
858 | bool | |
859 | needs_output_section() const | |
860 | { return true; } | |
861 | ||
77e65537 ILT |
862 | // Finalize symbols--we just need to update dot. |
863 | void | |
864 | finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value, | |
865 | Output_section**) | |
866 | { *dot_value += this->size_; } | |
867 | ||
868 | // Store the value in the section. | |
869 | void | |
870 | set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t, | |
871 | uint64_t* dot_value, Output_section**, std::string*, | |
872 | Input_section_list*); | |
873 | ||
874 | // Print for debugging. | |
875 | void | |
876 | print(FILE*) const; | |
877 | ||
878 | private: | |
879 | // The size in bytes. | |
880 | int size_; | |
881 | // Whether the value is signed. | |
882 | bool is_signed_; | |
883 | // The value. | |
884 | Expression* val_; | |
885 | }; | |
886 | ||
887 | // Store the value in the section. | |
888 | ||
889 | void | |
890 | Output_section_element_data::set_section_addresses( | |
891 | Symbol_table* symtab, | |
892 | Layout* layout, | |
893 | Output_section* os, | |
894 | uint64_t, | |
895 | uint64_t* dot_value, | |
896 | Output_section** dot_section, | |
897 | std::string*, | |
898 | Input_section_list*) | |
899 | { | |
900 | gold_assert(os != NULL); | |
20e6d0d6 DK |
901 | Output_data_expression* expression = |
902 | new Output_data_expression(this->size_, this->is_signed_, this->val_, | |
903 | symtab, layout, *dot_value, *dot_section); | |
904 | os->add_output_section_data(expression); | |
905 | layout->new_output_section_data_from_script(expression); | |
77e65537 | 906 | *dot_value += this->size_; |
a445fddf ILT |
907 | } |
908 | ||
494e05f4 ILT |
909 | // Print for debugging. |
910 | ||
911 | void | |
912 | Output_section_element_data::print(FILE* f) const | |
913 | { | |
914 | const char* s; | |
915 | switch (this->size_) | |
916 | { | |
917 | case 1: | |
918 | s = "BYTE"; | |
919 | break; | |
920 | case 2: | |
921 | s = "SHORT"; | |
922 | break; | |
923 | case 4: | |
924 | s = "LONG"; | |
925 | break; | |
926 | case 8: | |
927 | if (this->is_signed_) | |
928 | s = "SQUAD"; | |
929 | else | |
930 | s = "QUAD"; | |
931 | break; | |
932 | default: | |
933 | gold_unreachable(); | |
934 | } | |
935 | fprintf(f, " %s(", s); | |
936 | this->val_->print(f); | |
937 | fprintf(f, ")\n"); | |
938 | } | |
939 | ||
940 | // A fill value setting in an output section. | |
941 | ||
942 | class Output_section_element_fill : public Output_section_element | |
943 | { | |
944 | public: | |
945 | Output_section_element_fill(Expression* val) | |
946 | : val_(val) | |
947 | { } | |
948 | ||
a445fddf ILT |
949 | // Update the fill value while setting section addresses. |
950 | void | |
951 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
77e65537 ILT |
952 | uint64_t, uint64_t* dot_value, |
953 | Output_section** dot_section, | |
954 | std::string* fill, Input_section_list*) | |
a445fddf | 955 | { |
77e65537 | 956 | Output_section* fill_section; |
919ed24c | 957 | uint64_t fill_val = this->val_->eval_with_dot(symtab, layout, false, |
77e65537 ILT |
958 | *dot_value, *dot_section, |
959 | &fill_section); | |
960 | if (fill_section != NULL) | |
961 | gold_warning(_("fill value is not absolute")); | |
a445fddf ILT |
962 | // FIXME: The GNU linker supports fill values of arbitrary length. |
963 | unsigned char fill_buff[4]; | |
964 | elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val); | |
965 | fill->assign(reinterpret_cast<char*>(fill_buff), 4); | |
966 | } | |
967 | ||
968 | // Print for debugging. | |
494e05f4 ILT |
969 | void |
970 | print(FILE* f) const | |
971 | { | |
972 | fprintf(f, " FILL("); | |
973 | this->val_->print(f); | |
974 | fprintf(f, ")\n"); | |
975 | } | |
976 | ||
977 | private: | |
978 | // The new fill value. | |
979 | Expression* val_; | |
980 | }; | |
981 | ||
a445fddf ILT |
982 | // Return whether STRING contains a wildcard character. This is used |
983 | // to speed up matching. | |
984 | ||
985 | static inline bool | |
986 | is_wildcard_string(const std::string& s) | |
987 | { | |
988 | return strpbrk(s.c_str(), "?*[") != NULL; | |
989 | } | |
990 | ||
494e05f4 ILT |
991 | // An input section specification in an output section |
992 | ||
993 | class Output_section_element_input : public Output_section_element | |
994 | { | |
995 | public: | |
494e05f4 ILT |
996 | Output_section_element_input(const Input_section_spec* spec, bool keep); |
997 | ||
a445fddf ILT |
998 | // Finalize symbols--just update the value of the dot symbol. |
999 | void | |
77e65537 ILT |
1000 | finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value, |
1001 | Output_section** dot_section) | |
a445fddf ILT |
1002 | { |
1003 | *dot_value = this->final_dot_value_; | |
77e65537 | 1004 | *dot_section = this->final_dot_section_; |
a445fddf ILT |
1005 | } |
1006 | ||
1007 | // See whether we match FILE_NAME and SECTION_NAME as an input | |
1008 | // section. | |
1009 | bool | |
1010 | match_name(const char* file_name, const char* section_name) const; | |
1011 | ||
1012 | // Set the section address. | |
1013 | void | |
1014 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
1015 | uint64_t subalign, uint64_t* dot_value, | |
77e65537 ILT |
1016 | Output_section**, std::string* fill, |
1017 | Input_section_list*); | |
a445fddf ILT |
1018 | |
1019 | // Print for debugging. | |
494e05f4 ILT |
1020 | void |
1021 | print(FILE* f) const; | |
1022 | ||
1023 | private: | |
1024 | // An input section pattern. | |
1025 | struct Input_section_pattern | |
1026 | { | |
1027 | std::string pattern; | |
a445fddf | 1028 | bool pattern_is_wildcard; |
494e05f4 ILT |
1029 | Sort_wildcard sort; |
1030 | ||
1031 | Input_section_pattern(const char* patterna, size_t patternlena, | |
1032 | Sort_wildcard sorta) | |
a445fddf ILT |
1033 | : pattern(patterna, patternlena), |
1034 | pattern_is_wildcard(is_wildcard_string(this->pattern)), | |
1035 | sort(sorta) | |
494e05f4 ILT |
1036 | { } |
1037 | }; | |
1038 | ||
1039 | typedef std::vector<Input_section_pattern> Input_section_patterns; | |
1040 | ||
a445fddf ILT |
1041 | // Filename_exclusions is a pair of filename pattern and a bool |
1042 | // indicating whether the filename is a wildcard. | |
1043 | typedef std::vector<std::pair<std::string, bool> > Filename_exclusions; | |
1044 | ||
1045 | // Return whether STRING matches PATTERN, where IS_WILDCARD_PATTERN | |
1046 | // indicates whether this is a wildcard pattern. | |
1047 | static inline bool | |
1048 | match(const char* string, const char* pattern, bool is_wildcard_pattern) | |
1049 | { | |
1050 | return (is_wildcard_pattern | |
1051 | ? fnmatch(pattern, string, 0) == 0 | |
1052 | : strcmp(string, pattern) == 0); | |
1053 | } | |
494e05f4 | 1054 | |
a445fddf ILT |
1055 | // See if we match a file name. |
1056 | bool | |
1057 | match_file_name(const char* file_name) const; | |
1058 | ||
1059 | // The file name pattern. If this is the empty string, we match all | |
1060 | // files. | |
494e05f4 | 1061 | std::string filename_pattern_; |
a445fddf ILT |
1062 | // Whether the file name pattern is a wildcard. |
1063 | bool filename_is_wildcard_; | |
494e05f4 ILT |
1064 | // How the file names should be sorted. This may only be |
1065 | // SORT_WILDCARD_NONE or SORT_WILDCARD_BY_NAME. | |
1066 | Sort_wildcard filename_sort_; | |
1067 | // The list of file names to exclude. | |
1068 | Filename_exclusions filename_exclusions_; | |
1069 | // The list of input section patterns. | |
1070 | Input_section_patterns input_section_patterns_; | |
1071 | // Whether to keep this section when garbage collecting. | |
1072 | bool keep_; | |
a445fddf ILT |
1073 | // The value of dot after including all matching sections. |
1074 | uint64_t final_dot_value_; | |
77e65537 ILT |
1075 | // The section where dot is defined after including all matching |
1076 | // sections. | |
1077 | Output_section* final_dot_section_; | |
494e05f4 ILT |
1078 | }; |
1079 | ||
1080 | // Construct Output_section_element_input. The parser records strings | |
1081 | // as pointers into a copy of the script file, which will go away when | |
1082 | // parsing is complete. We make sure they are in std::string objects. | |
1083 | ||
1084 | Output_section_element_input::Output_section_element_input( | |
1085 | const Input_section_spec* spec, | |
1086 | bool keep) | |
a445fddf ILT |
1087 | : filename_pattern_(), |
1088 | filename_is_wildcard_(false), | |
494e05f4 ILT |
1089 | filename_sort_(spec->file.sort), |
1090 | filename_exclusions_(), | |
1091 | input_section_patterns_(), | |
a445fddf | 1092 | keep_(keep), |
77e65537 ILT |
1093 | final_dot_value_(0), |
1094 | final_dot_section_(NULL) | |
494e05f4 | 1095 | { |
a445fddf ILT |
1096 | // The filename pattern "*" is common, and matches all files. Turn |
1097 | // it into the empty string. | |
1098 | if (spec->file.name.length != 1 || spec->file.name.value[0] != '*') | |
1099 | this->filename_pattern_.assign(spec->file.name.value, | |
1100 | spec->file.name.length); | |
1101 | this->filename_is_wildcard_ = is_wildcard_string(this->filename_pattern_); | |
1102 | ||
494e05f4 ILT |
1103 | if (spec->input_sections.exclude != NULL) |
1104 | { | |
1105 | for (String_list::const_iterator p = | |
1106 | spec->input_sections.exclude->begin(); | |
1107 | p != spec->input_sections.exclude->end(); | |
1108 | ++p) | |
a445fddf ILT |
1109 | { |
1110 | bool is_wildcard = is_wildcard_string(*p); | |
1111 | this->filename_exclusions_.push_back(std::make_pair(*p, | |
1112 | is_wildcard)); | |
1113 | } | |
494e05f4 ILT |
1114 | } |
1115 | ||
1116 | if (spec->input_sections.sections != NULL) | |
1117 | { | |
1118 | Input_section_patterns& isp(this->input_section_patterns_); | |
1119 | for (String_sort_list::const_iterator p = | |
1120 | spec->input_sections.sections->begin(); | |
1121 | p != spec->input_sections.sections->end(); | |
1122 | ++p) | |
1123 | isp.push_back(Input_section_pattern(p->name.value, p->name.length, | |
1124 | p->sort)); | |
1125 | } | |
1126 | } | |
1127 | ||
a445fddf ILT |
1128 | // See whether we match FILE_NAME. |
1129 | ||
1130 | bool | |
1131 | Output_section_element_input::match_file_name(const char* file_name) const | |
1132 | { | |
1133 | if (!this->filename_pattern_.empty()) | |
1134 | { | |
1135 | // If we were called with no filename, we refuse to match a | |
1136 | // pattern which requires a file name. | |
1137 | if (file_name == NULL) | |
1138 | return false; | |
1139 | ||
1140 | if (!match(file_name, this->filename_pattern_.c_str(), | |
1141 | this->filename_is_wildcard_)) | |
1142 | return false; | |
1143 | } | |
1144 | ||
1145 | if (file_name != NULL) | |
1146 | { | |
1147 | // Now we have to see whether FILE_NAME matches one of the | |
1148 | // exclusion patterns, if any. | |
1149 | for (Filename_exclusions::const_iterator p = | |
1150 | this->filename_exclusions_.begin(); | |
1151 | p != this->filename_exclusions_.end(); | |
1152 | ++p) | |
1153 | { | |
1154 | if (match(file_name, p->first.c_str(), p->second)) | |
1155 | return false; | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | return true; | |
1160 | } | |
1161 | ||
1162 | // See whether we match FILE_NAME and SECTION_NAME. | |
1163 | ||
1164 | bool | |
1165 | Output_section_element_input::match_name(const char* file_name, | |
1166 | const char* section_name) const | |
1167 | { | |
1168 | if (!this->match_file_name(file_name)) | |
1169 | return false; | |
1170 | ||
1171 | // If there are no section name patterns, then we match. | |
1172 | if (this->input_section_patterns_.empty()) | |
1173 | return true; | |
1174 | ||
1175 | // See whether we match the section name patterns. | |
1176 | for (Input_section_patterns::const_iterator p = | |
1177 | this->input_section_patterns_.begin(); | |
1178 | p != this->input_section_patterns_.end(); | |
1179 | ++p) | |
1180 | { | |
1181 | if (match(section_name, p->pattern.c_str(), p->pattern_is_wildcard)) | |
1182 | return true; | |
1183 | } | |
1184 | ||
1185 | // We didn't match any section names, so we didn't match. | |
1186 | return false; | |
1187 | } | |
1188 | ||
1189 | // Information we use to sort the input sections. | |
1190 | ||
20e6d0d6 | 1191 | class Input_section_info |
a445fddf | 1192 | { |
20e6d0d6 | 1193 | public: |
2ea97941 ILT |
1194 | Input_section_info(const Output_section::Simple_input_section& input_section) |
1195 | : input_section_(input_section), section_name_(), | |
20e6d0d6 DK |
1196 | size_(0), addralign_(1) |
1197 | { } | |
1198 | ||
1199 | // Return the simple input section. | |
1200 | const Output_section::Simple_input_section& | |
1201 | input_section() const | |
1202 | { return this->input_section_; } | |
1203 | ||
1204 | // Return the object. | |
1205 | Relobj* | |
1206 | relobj() const | |
1207 | { return this->input_section_.relobj(); } | |
1208 | ||
1209 | // Return the section index. | |
1210 | unsigned int | |
1211 | shndx() | |
1212 | { return this->input_section_.shndx(); } | |
1213 | ||
1214 | // Return the section name. | |
1215 | const std::string& | |
1216 | section_name() const | |
1217 | { return this->section_name_; } | |
1218 | ||
1219 | // Set the section name. | |
1220 | void | |
2ea97941 ILT |
1221 | set_section_name(const std::string name) |
1222 | { this->section_name_ = name; } | |
20e6d0d6 DK |
1223 | |
1224 | // Return the section size. | |
1225 | uint64_t | |
1226 | size() const | |
1227 | { return this->size_; } | |
1228 | ||
1229 | // Set the section size. | |
1230 | void | |
2ea97941 ILT |
1231 | set_size(uint64_t size) |
1232 | { this->size_ = size; } | |
20e6d0d6 DK |
1233 | |
1234 | // Return the address alignment. | |
1235 | uint64_t | |
1236 | addralign() const | |
1237 | { return this->addralign_; } | |
1238 | ||
1239 | // Set the address alignment. | |
1240 | void | |
2ea97941 ILT |
1241 | set_addralign(uint64_t addralign) |
1242 | { this->addralign_ = addralign; } | |
20e6d0d6 DK |
1243 | |
1244 | private: | |
1245 | // Input section, can be a relaxed section. | |
1246 | Output_section::Simple_input_section input_section_; | |
1247 | // Name of the section. | |
1248 | std::string section_name_; | |
1249 | // Section size. | |
1250 | uint64_t size_; | |
1251 | // Address alignment. | |
1252 | uint64_t addralign_; | |
a445fddf ILT |
1253 | }; |
1254 | ||
1255 | // A class to sort the input sections. | |
1256 | ||
1257 | class Input_section_sorter | |
1258 | { | |
1259 | public: | |
1260 | Input_section_sorter(Sort_wildcard filename_sort, Sort_wildcard section_sort) | |
1261 | : filename_sort_(filename_sort), section_sort_(section_sort) | |
1262 | { } | |
1263 | ||
1264 | bool | |
1265 | operator()(const Input_section_info&, const Input_section_info&) const; | |
1266 | ||
1267 | private: | |
1268 | Sort_wildcard filename_sort_; | |
1269 | Sort_wildcard section_sort_; | |
1270 | }; | |
1271 | ||
1272 | bool | |
1273 | Input_section_sorter::operator()(const Input_section_info& isi1, | |
1274 | const Input_section_info& isi2) const | |
1275 | { | |
1276 | if (this->section_sort_ == SORT_WILDCARD_BY_NAME | |
1277 | || this->section_sort_ == SORT_WILDCARD_BY_NAME_BY_ALIGNMENT | |
1278 | || (this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT_BY_NAME | |
20e6d0d6 | 1279 | && isi1.addralign() == isi2.addralign())) |
a445fddf | 1280 | { |
20e6d0d6 DK |
1281 | if (isi1.section_name() != isi2.section_name()) |
1282 | return isi1.section_name() < isi2.section_name(); | |
a445fddf ILT |
1283 | } |
1284 | if (this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT | |
1285 | || this->section_sort_ == SORT_WILDCARD_BY_NAME_BY_ALIGNMENT | |
1286 | || this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT_BY_NAME) | |
1287 | { | |
20e6d0d6 DK |
1288 | if (isi1.addralign() != isi2.addralign()) |
1289 | return isi1.addralign() < isi2.addralign(); | |
a445fddf ILT |
1290 | } |
1291 | if (this->filename_sort_ == SORT_WILDCARD_BY_NAME) | |
1292 | { | |
20e6d0d6 DK |
1293 | if (isi1.relobj()->name() != isi2.relobj()->name()) |
1294 | return (isi1.relobj()->name() < isi2.relobj()->name()); | |
a445fddf ILT |
1295 | } |
1296 | ||
1297 | // Otherwise we leave them in the same order. | |
1298 | return false; | |
1299 | } | |
1300 | ||
1301 | // Set the section address. Look in INPUT_SECTIONS for sections which | |
1302 | // match this spec, sort them as specified, and add them to the output | |
1303 | // section. | |
1304 | ||
1305 | void | |
1306 | Output_section_element_input::set_section_addresses( | |
1307 | Symbol_table*, | |
20e6d0d6 | 1308 | Layout* layout, |
a445fddf ILT |
1309 | Output_section* output_section, |
1310 | uint64_t subalign, | |
1311 | uint64_t* dot_value, | |
77e65537 | 1312 | Output_section** dot_section, |
a445fddf ILT |
1313 | std::string* fill, |
1314 | Input_section_list* input_sections) | |
1315 | { | |
1316 | // We build a list of sections which match each | |
1317 | // Input_section_pattern. | |
1318 | ||
1319 | typedef std::vector<std::vector<Input_section_info> > Matching_sections; | |
1320 | size_t input_pattern_count = this->input_section_patterns_.size(); | |
1321 | if (input_pattern_count == 0) | |
1322 | input_pattern_count = 1; | |
1323 | Matching_sections matching_sections(input_pattern_count); | |
1324 | ||
1325 | // Look through the list of sections for this output section. Add | |
1326 | // each one which matches to one of the elements of | |
1327 | // MATCHING_SECTIONS. | |
1328 | ||
1329 | Input_section_list::iterator p = input_sections->begin(); | |
1330 | while (p != input_sections->end()) | |
1331 | { | |
20e6d0d6 DK |
1332 | Relobj* relobj = p->relobj(); |
1333 | unsigned int shndx = p->shndx(); | |
1334 | Input_section_info isi(*p); | |
1335 | ||
a445fddf ILT |
1336 | // Calling section_name and section_addralign is not very |
1337 | // efficient. | |
a445fddf ILT |
1338 | |
1339 | // Lock the object so that we can get information about the | |
1340 | // section. This is OK since we know we are single-threaded | |
1341 | // here. | |
1342 | { | |
1343 | const Task* task = reinterpret_cast<const Task*>(-1); | |
20e6d0d6 DK |
1344 | Task_lock_obj<Object> tl(task, relobj); |
1345 | ||
1346 | isi.set_section_name(relobj->section_name(shndx)); | |
1347 | if (p->is_relaxed_input_section()) | |
c0a62865 DK |
1348 | { |
1349 | // We use current data size because relxed section sizes may not | |
1350 | // have finalized yet. | |
1351 | isi.set_size(p->relaxed_input_section()->current_data_size()); | |
1352 | isi.set_addralign(p->relaxed_input_section()->addralign()); | |
1353 | } | |
20e6d0d6 | 1354 | else |
c0a62865 DK |
1355 | { |
1356 | isi.set_size(relobj->section_size(shndx)); | |
1357 | isi.set_addralign(relobj->section_addralign(shndx)); | |
1358 | } | |
a445fddf ILT |
1359 | } |
1360 | ||
20e6d0d6 | 1361 | if (!this->match_file_name(relobj->name().c_str())) |
a445fddf ILT |
1362 | ++p; |
1363 | else if (this->input_section_patterns_.empty()) | |
1364 | { | |
1365 | matching_sections[0].push_back(isi); | |
1366 | p = input_sections->erase(p); | |
1367 | } | |
1368 | else | |
1369 | { | |
1370 | size_t i; | |
1371 | for (i = 0; i < input_pattern_count; ++i) | |
1372 | { | |
1373 | const Input_section_pattern& | |
1374 | isp(this->input_section_patterns_[i]); | |
20e6d0d6 | 1375 | if (match(isi.section_name().c_str(), isp.pattern.c_str(), |
a445fddf ILT |
1376 | isp.pattern_is_wildcard)) |
1377 | break; | |
1378 | } | |
1379 | ||
1380 | if (i >= this->input_section_patterns_.size()) | |
1381 | ++p; | |
1382 | else | |
1383 | { | |
1384 | matching_sections[i].push_back(isi); | |
1385 | p = input_sections->erase(p); | |
1386 | } | |
1387 | } | |
1388 | } | |
1389 | ||
1390 | // Look through MATCHING_SECTIONS. Sort each one as specified, | |
1391 | // using a stable sort so that we get the default order when | |
1392 | // sections are otherwise equal. Add each input section to the | |
1393 | // output section. | |
1394 | ||
661be1e2 | 1395 | uint64_t dot = *dot_value; |
a445fddf ILT |
1396 | for (size_t i = 0; i < input_pattern_count; ++i) |
1397 | { | |
1398 | if (matching_sections[i].empty()) | |
1399 | continue; | |
1400 | ||
1401 | gold_assert(output_section != NULL); | |
1402 | ||
1403 | const Input_section_pattern& isp(this->input_section_patterns_[i]); | |
1404 | if (isp.sort != SORT_WILDCARD_NONE | |
1405 | || this->filename_sort_ != SORT_WILDCARD_NONE) | |
1406 | std::stable_sort(matching_sections[i].begin(), | |
1407 | matching_sections[i].end(), | |
1408 | Input_section_sorter(this->filename_sort_, | |
1409 | isp.sort)); | |
1410 | ||
2ea97941 | 1411 | for (std::vector<Input_section_info>::const_iterator p = |
a445fddf | 1412 | matching_sections[i].begin(); |
2ea97941 ILT |
1413 | p != matching_sections[i].end(); |
1414 | ++p) | |
a445fddf | 1415 | { |
2ea97941 | 1416 | uint64_t this_subalign = p->addralign(); |
a445fddf ILT |
1417 | if (this_subalign < subalign) |
1418 | this_subalign = subalign; | |
1419 | ||
661be1e2 | 1420 | uint64_t address = align_address(dot, this_subalign); |
a445fddf | 1421 | |
661be1e2 | 1422 | if (address > dot && !fill->empty()) |
a445fddf ILT |
1423 | { |
1424 | section_size_type length = | |
661be1e2 | 1425 | convert_to_section_size_type(address - dot); |
a445fddf ILT |
1426 | std::string this_fill = this->get_fill_string(fill, length); |
1427 | Output_section_data* posd = new Output_data_const(this_fill, 0); | |
1428 | output_section->add_output_section_data(posd); | |
20e6d0d6 | 1429 | layout->new_output_section_data_from_script(posd); |
a445fddf ILT |
1430 | } |
1431 | ||
8923b24c DK |
1432 | output_section->add_simple_input_section(p->input_section(), |
1433 | p->size(), | |
1434 | this_subalign); | |
a445fddf | 1435 | |
2ea97941 | 1436 | dot = address + p->size(); |
a445fddf ILT |
1437 | } |
1438 | } | |
1439 | ||
661be1e2 ILT |
1440 | // An SHF_TLS/SHT_NOBITS section does not take up any |
1441 | // address space. | |
1442 | if (output_section == NULL | |
1443 | || (output_section->flags() & elfcpp::SHF_TLS) == 0 | |
1444 | || output_section->type() != elfcpp::SHT_NOBITS) | |
1445 | *dot_value = dot; | |
1446 | ||
a445fddf | 1447 | this->final_dot_value_ = *dot_value; |
77e65537 | 1448 | this->final_dot_section_ = *dot_section; |
a445fddf ILT |
1449 | } |
1450 | ||
494e05f4 ILT |
1451 | // Print for debugging. |
1452 | ||
1453 | void | |
1454 | Output_section_element_input::print(FILE* f) const | |
1455 | { | |
1456 | fprintf(f, " "); | |
1457 | ||
1458 | if (this->keep_) | |
1459 | fprintf(f, "KEEP("); | |
1460 | ||
1461 | if (!this->filename_pattern_.empty()) | |
1462 | { | |
1463 | bool need_close_paren = false; | |
1464 | switch (this->filename_sort_) | |
1465 | { | |
1466 | case SORT_WILDCARD_NONE: | |
1467 | break; | |
1468 | case SORT_WILDCARD_BY_NAME: | |
1469 | fprintf(f, "SORT_BY_NAME("); | |
1470 | need_close_paren = true; | |
1471 | break; | |
1472 | default: | |
1473 | gold_unreachable(); | |
1474 | } | |
1475 | ||
1476 | fprintf(f, "%s", this->filename_pattern_.c_str()); | |
1477 | ||
1478 | if (need_close_paren) | |
1479 | fprintf(f, ")"); | |
1480 | } | |
1481 | ||
1482 | if (!this->input_section_patterns_.empty() | |
1483 | || !this->filename_exclusions_.empty()) | |
1484 | { | |
1485 | fprintf(f, "("); | |
1486 | ||
1487 | bool need_space = false; | |
1488 | if (!this->filename_exclusions_.empty()) | |
1489 | { | |
1490 | fprintf(f, "EXCLUDE_FILE("); | |
1491 | bool need_comma = false; | |
1492 | for (Filename_exclusions::const_iterator p = | |
1493 | this->filename_exclusions_.begin(); | |
1494 | p != this->filename_exclusions_.end(); | |
1495 | ++p) | |
1496 | { | |
1497 | if (need_comma) | |
1498 | fprintf(f, ", "); | |
a445fddf | 1499 | fprintf(f, "%s", p->first.c_str()); |
494e05f4 ILT |
1500 | need_comma = true; |
1501 | } | |
1502 | fprintf(f, ")"); | |
1503 | need_space = true; | |
1504 | } | |
1505 | ||
1506 | for (Input_section_patterns::const_iterator p = | |
1507 | this->input_section_patterns_.begin(); | |
1508 | p != this->input_section_patterns_.end(); | |
1509 | ++p) | |
1510 | { | |
1511 | if (need_space) | |
1512 | fprintf(f, " "); | |
1513 | ||
1514 | int close_parens = 0; | |
1515 | switch (p->sort) | |
1516 | { | |
1517 | case SORT_WILDCARD_NONE: | |
1518 | break; | |
1519 | case SORT_WILDCARD_BY_NAME: | |
1520 | fprintf(f, "SORT_BY_NAME("); | |
1521 | close_parens = 1; | |
1522 | break; | |
1523 | case SORT_WILDCARD_BY_ALIGNMENT: | |
1524 | fprintf(f, "SORT_BY_ALIGNMENT("); | |
1525 | close_parens = 1; | |
1526 | break; | |
1527 | case SORT_WILDCARD_BY_NAME_BY_ALIGNMENT: | |
1528 | fprintf(f, "SORT_BY_NAME(SORT_BY_ALIGNMENT("); | |
1529 | close_parens = 2; | |
1530 | break; | |
1531 | case SORT_WILDCARD_BY_ALIGNMENT_BY_NAME: | |
1532 | fprintf(f, "SORT_BY_ALIGNMENT(SORT_BY_NAME("); | |
1533 | close_parens = 2; | |
1534 | break; | |
1535 | default: | |
1536 | gold_unreachable(); | |
1537 | } | |
1538 | ||
1539 | fprintf(f, "%s", p->pattern.c_str()); | |
1540 | ||
1541 | for (int i = 0; i < close_parens; ++i) | |
1542 | fprintf(f, ")"); | |
1543 | ||
1544 | need_space = true; | |
1545 | } | |
1546 | ||
1547 | fprintf(f, ")"); | |
1548 | } | |
1549 | ||
1550 | if (this->keep_) | |
1551 | fprintf(f, ")"); | |
1552 | ||
1553 | fprintf(f, "\n"); | |
1554 | } | |
1555 | ||
1556 | // An output section. | |
1557 | ||
1558 | class Output_section_definition : public Sections_element | |
1559 | { | |
1560 | public: | |
a445fddf ILT |
1561 | typedef Output_section_element::Input_section_list Input_section_list; |
1562 | ||
494e05f4 ILT |
1563 | Output_section_definition(const char* name, size_t namelen, |
1564 | const Parser_output_section_header* header); | |
1565 | ||
1566 | // Finish the output section with the information in the trailer. | |
1567 | void | |
1568 | finish(const Parser_output_section_trailer* trailer); | |
1569 | ||
1570 | // Add a symbol to be defined. | |
1571 | void | |
1572 | add_symbol_assignment(const char* name, size_t length, Expression* value, | |
1573 | bool provide, bool hidden); | |
a445fddf ILT |
1574 | |
1575 | // Add an assignment to the special dot symbol. | |
1576 | void | |
1577 | add_dot_assignment(Expression* value); | |
1578 | ||
494e05f4 ILT |
1579 | // Add an assertion. |
1580 | void | |
1581 | add_assertion(Expression* check, const char* message, size_t messagelen); | |
1582 | ||
1583 | // Add a data item to the current output section. | |
1584 | void | |
1585 | add_data(int size, bool is_signed, Expression* val); | |
1586 | ||
1587 | // Add a setting for the fill value. | |
1588 | void | |
1589 | add_fill(Expression* val); | |
1590 | ||
1591 | // Add an input section specification. | |
1592 | void | |
1593 | add_input_section(const Input_section_spec* spec, bool keep); | |
1594 | ||
0d371ad3 ILT |
1595 | // Return whether the output section is relro. |
1596 | bool | |
1597 | is_relro() const | |
1598 | { return this->is_relro_; } | |
1599 | ||
2d924fd9 ILT |
1600 | // Record that the output section is relro. |
1601 | void | |
1602 | set_is_relro() | |
1603 | { this->is_relro_ = true; } | |
1604 | ||
919ed24c ILT |
1605 | // Create any required output sections. |
1606 | void | |
1607 | create_sections(Layout*); | |
1608 | ||
a445fddf ILT |
1609 | // Add any symbols being defined to the symbol table. |
1610 | void | |
1611 | add_symbols_to_table(Symbol_table* symtab); | |
1612 | ||
1613 | // Finalize symbols and check assertions. | |
1614 | void | |
77e65537 | 1615 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*); |
a445fddf ILT |
1616 | |
1617 | // Return the output section name to use for an input file name and | |
1618 | // section name. | |
1619 | const char* | |
1620 | output_section_name(const char* file_name, const char* section_name, | |
1e5d2fb1 | 1621 | Output_section***, Script_sections::Section_type*); |
a445fddf | 1622 | |
0d371ad3 ILT |
1623 | // Initialize OSP with an output section. |
1624 | void | |
1625 | orphan_section_init(Orphan_section_placement* osp, | |
1626 | Script_sections::Elements_iterator p) | |
1627 | { osp->output_section_init(this->name_, this->output_section_, p); } | |
a445fddf ILT |
1628 | |
1629 | // Set the section address. | |
1630 | void | |
1631 | set_section_addresses(Symbol_table* symtab, Layout* layout, | |
fd247bfe | 1632 | uint64_t* dot_value, uint64_t* load_address); |
a445fddf | 1633 | |
3802b2dd ILT |
1634 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
1635 | // this section is constrained, and the input sections do not match, | |
1636 | // return the constraint, and set *POSD. | |
1637 | Section_constraint | |
1638 | check_constraint(Output_section_definition** posd); | |
1639 | ||
1640 | // See if this is the alternate output section for a constrained | |
1641 | // output section. If it is, transfer the Output_section and return | |
1642 | // true. Otherwise return false. | |
1643 | bool | |
1644 | alternate_constraint(Output_section_definition*, Section_constraint); | |
1645 | ||
1c4f3631 | 1646 | // Get the list of segments to use for an allocated section when |
2cefc357 | 1647 | // using a PHDRS clause. |
1c4f3631 | 1648 | Output_section* |
2cefc357 | 1649 | allocate_to_segment(String_list** phdrs_list, bool* orphan); |
1c4f3631 | 1650 | |
8f2eb564 ILT |
1651 | // Look for an output section by name and return the address, the |
1652 | // load address, the alignment, and the size. This is used when an | |
1653 | // expression refers to an output section which was not actually | |
1654 | // created. This returns true if the section was found, false | |
1655 | // otherwise. | |
1656 | bool | |
1657 | get_output_section_info(const char*, uint64_t*, uint64_t*, uint64_t*, | |
1658 | uint64_t*) const; | |
1659 | ||
2d924fd9 ILT |
1660 | // Return the associated Output_section if there is one. |
1661 | Output_section* | |
1662 | get_output_section() const | |
1663 | { return this->output_section_; } | |
1664 | ||
494e05f4 ILT |
1665 | // Print the contents to the FILE. This is for debugging. |
1666 | void | |
1667 | print(FILE*) const; | |
1668 | ||
1e5d2fb1 DK |
1669 | // Return the output section type if specified or Script_sections::ST_NONE. |
1670 | Script_sections::Section_type | |
1671 | section_type() const; | |
1672 | ||
494e05f4 | 1673 | private: |
1e5d2fb1 DK |
1674 | static const char* |
1675 | script_section_type_name(Script_section_type); | |
1676 | ||
494e05f4 ILT |
1677 | typedef std::vector<Output_section_element*> Output_section_elements; |
1678 | ||
1679 | // The output section name. | |
1680 | std::string name_; | |
1681 | // The address. This may be NULL. | |
1682 | Expression* address_; | |
1683 | // The load address. This may be NULL. | |
1684 | Expression* load_address_; | |
1685 | // The alignment. This may be NULL. | |
1686 | Expression* align_; | |
1687 | // The input section alignment. This may be NULL. | |
1688 | Expression* subalign_; | |
3802b2dd ILT |
1689 | // The constraint, if any. |
1690 | Section_constraint constraint_; | |
494e05f4 ILT |
1691 | // The fill value. This may be NULL. |
1692 | Expression* fill_; | |
1c4f3631 ILT |
1693 | // The list of segments this section should go into. This may be |
1694 | // NULL. | |
1695 | String_list* phdrs_; | |
494e05f4 ILT |
1696 | // The list of elements defining the section. |
1697 | Output_section_elements elements_; | |
a445fddf ILT |
1698 | // The Output_section created for this definition. This will be |
1699 | // NULL if none was created. | |
1700 | Output_section* output_section_; | |
8f2eb564 ILT |
1701 | // The address after it has been evaluated. |
1702 | uint64_t evaluated_address_; | |
1703 | // The load address after it has been evaluated. | |
1704 | uint64_t evaluated_load_address_; | |
1705 | // The alignment after it has been evaluated. | |
1706 | uint64_t evaluated_addralign_; | |
2d924fd9 ILT |
1707 | // The output section is relro. |
1708 | bool is_relro_; | |
1e5d2fb1 DK |
1709 | // The output section type if specified. |
1710 | enum Script_section_type script_section_type_; | |
494e05f4 ILT |
1711 | }; |
1712 | ||
1713 | // Constructor. | |
1714 | ||
1715 | Output_section_definition::Output_section_definition( | |
1716 | const char* name, | |
1717 | size_t namelen, | |
1718 | const Parser_output_section_header* header) | |
1719 | : name_(name, namelen), | |
1720 | address_(header->address), | |
1721 | load_address_(header->load_address), | |
1722 | align_(header->align), | |
1723 | subalign_(header->subalign), | |
3802b2dd | 1724 | constraint_(header->constraint), |
494e05f4 | 1725 | fill_(NULL), |
1c4f3631 | 1726 | phdrs_(NULL), |
a445fddf | 1727 | elements_(), |
2d924fd9 ILT |
1728 | output_section_(NULL), |
1729 | evaluated_address_(0), | |
1730 | evaluated_load_address_(0), | |
1731 | evaluated_addralign_(0), | |
1e5d2fb1 DK |
1732 | is_relro_(false), |
1733 | script_section_type_(header->section_type) | |
494e05f4 ILT |
1734 | { |
1735 | } | |
1736 | ||
1737 | // Finish an output section. | |
1738 | ||
1739 | void | |
1740 | Output_section_definition::finish(const Parser_output_section_trailer* trailer) | |
1741 | { | |
1742 | this->fill_ = trailer->fill; | |
1c4f3631 | 1743 | this->phdrs_ = trailer->phdrs; |
494e05f4 ILT |
1744 | } |
1745 | ||
1746 | // Add a symbol to be defined. | |
1747 | ||
1748 | void | |
1749 | Output_section_definition::add_symbol_assignment(const char* name, | |
1750 | size_t length, | |
1751 | Expression* value, | |
1752 | bool provide, | |
1753 | bool hidden) | |
1754 | { | |
1755 | Output_section_element* p = new Output_section_element_assignment(name, | |
1756 | length, | |
1757 | value, | |
1758 | provide, | |
1759 | hidden); | |
1760 | this->elements_.push_back(p); | |
1761 | } | |
1762 | ||
a445fddf | 1763 | // Add an assignment to the special dot symbol. |
494e05f4 ILT |
1764 | |
1765 | void | |
a445fddf ILT |
1766 | Output_section_definition::add_dot_assignment(Expression* value) |
1767 | { | |
1768 | Output_section_element* p = new Output_section_element_dot_assignment(value); | |
1769 | this->elements_.push_back(p); | |
1770 | } | |
1771 | ||
1772 | // Add an assertion. | |
1773 | ||
1774 | void | |
1775 | Output_section_definition::add_assertion(Expression* check, | |
1776 | const char* message, | |
494e05f4 ILT |
1777 | size_t messagelen) |
1778 | { | |
1779 | Output_section_element* p = new Output_section_element_assertion(check, | |
1780 | message, | |
1781 | messagelen); | |
1782 | this->elements_.push_back(p); | |
1783 | } | |
1784 | ||
1785 | // Add a data item to the current output section. | |
1786 | ||
1787 | void | |
1788 | Output_section_definition::add_data(int size, bool is_signed, Expression* val) | |
1789 | { | |
1790 | Output_section_element* p = new Output_section_element_data(size, is_signed, | |
1791 | val); | |
1792 | this->elements_.push_back(p); | |
1793 | } | |
1794 | ||
1795 | // Add a setting for the fill value. | |
1796 | ||
1797 | void | |
1798 | Output_section_definition::add_fill(Expression* val) | |
1799 | { | |
1800 | Output_section_element* p = new Output_section_element_fill(val); | |
1801 | this->elements_.push_back(p); | |
1802 | } | |
1803 | ||
1804 | // Add an input section specification. | |
1805 | ||
1806 | void | |
1807 | Output_section_definition::add_input_section(const Input_section_spec* spec, | |
1808 | bool keep) | |
1809 | { | |
1810 | Output_section_element* p = new Output_section_element_input(spec, keep); | |
1811 | this->elements_.push_back(p); | |
1812 | } | |
1813 | ||
919ed24c ILT |
1814 | // Create any required output sections. We need an output section if |
1815 | // there is a data statement here. | |
1816 | ||
1817 | void | |
1818 | Output_section_definition::create_sections(Layout* layout) | |
1819 | { | |
1820 | if (this->output_section_ != NULL) | |
1821 | return; | |
1822 | for (Output_section_elements::const_iterator p = this->elements_.begin(); | |
1823 | p != this->elements_.end(); | |
1824 | ++p) | |
1825 | { | |
1826 | if ((*p)->needs_output_section()) | |
1827 | { | |
1828 | const char* name = this->name_.c_str(); | |
1e5d2fb1 DK |
1829 | this->output_section_ = |
1830 | layout->make_output_section_for_script(name, this->section_type()); | |
919ed24c ILT |
1831 | return; |
1832 | } | |
1833 | } | |
1834 | } | |
1835 | ||
a445fddf ILT |
1836 | // Add any symbols being defined to the symbol table. |
1837 | ||
1838 | void | |
1839 | Output_section_definition::add_symbols_to_table(Symbol_table* symtab) | |
1840 | { | |
1841 | for (Output_section_elements::iterator p = this->elements_.begin(); | |
1842 | p != this->elements_.end(); | |
1843 | ++p) | |
1844 | (*p)->add_symbols_to_table(symtab); | |
1845 | } | |
1846 | ||
1847 | // Finalize symbols and check assertions. | |
1848 | ||
1849 | void | |
1850 | Output_section_definition::finalize_symbols(Symbol_table* symtab, | |
1851 | const Layout* layout, | |
a445fddf ILT |
1852 | uint64_t* dot_value) |
1853 | { | |
1854 | if (this->output_section_ != NULL) | |
1855 | *dot_value = this->output_section_->address(); | |
1856 | else | |
1857 | { | |
1858 | uint64_t address = *dot_value; | |
1859 | if (this->address_ != NULL) | |
1860 | { | |
77e65537 | 1861 | Output_section* dummy; |
919ed24c | 1862 | address = this->address_->eval_with_dot(symtab, layout, true, |
77e65537 | 1863 | *dot_value, NULL, |
a445fddf ILT |
1864 | &dummy); |
1865 | } | |
1866 | if (this->align_ != NULL) | |
1867 | { | |
77e65537 | 1868 | Output_section* dummy; |
919ed24c | 1869 | uint64_t align = this->align_->eval_with_dot(symtab, layout, true, |
a445fddf | 1870 | *dot_value, |
77e65537 | 1871 | NULL, |
a445fddf ILT |
1872 | &dummy); |
1873 | address = align_address(address, align); | |
1874 | } | |
1875 | *dot_value = address; | |
1876 | } | |
a445fddf | 1877 | |
77e65537 | 1878 | Output_section* dot_section = this->output_section_; |
a445fddf ILT |
1879 | for (Output_section_elements::iterator p = this->elements_.begin(); |
1880 | p != this->elements_.end(); | |
1881 | ++p) | |
77e65537 | 1882 | (*p)->finalize_symbols(symtab, layout, dot_value, &dot_section); |
a445fddf ILT |
1883 | } |
1884 | ||
1885 | // Return the output section name to use for an input section name. | |
1886 | ||
1887 | const char* | |
1e5d2fb1 DK |
1888 | Output_section_definition::output_section_name( |
1889 | const char* file_name, | |
1890 | const char* section_name, | |
1891 | Output_section*** slot, | |
1892 | Script_sections::Section_type *psection_type) | |
a445fddf ILT |
1893 | { |
1894 | // Ask each element whether it matches NAME. | |
1895 | for (Output_section_elements::const_iterator p = this->elements_.begin(); | |
1896 | p != this->elements_.end(); | |
1897 | ++p) | |
1898 | { | |
1899 | if ((*p)->match_name(file_name, section_name)) | |
1900 | { | |
1901 | // We found a match for NAME, which means that it should go | |
1902 | // into this output section. | |
1903 | *slot = &this->output_section_; | |
1e5d2fb1 | 1904 | *psection_type = this->section_type(); |
a445fddf ILT |
1905 | return this->name_.c_str(); |
1906 | } | |
1907 | } | |
1908 | ||
1909 | // We don't know about this section name. | |
1910 | return NULL; | |
1911 | } | |
1912 | ||
a445fddf ILT |
1913 | // Set the section address. Note that the OUTPUT_SECTION_ field will |
1914 | // be NULL if no input sections were mapped to this output section. | |
1915 | // We still have to adjust dot and process symbol assignments. | |
1916 | ||
1917 | void | |
1918 | Output_section_definition::set_section_addresses(Symbol_table* symtab, | |
1919 | Layout* layout, | |
fd247bfe ILT |
1920 | uint64_t* dot_value, |
1921 | uint64_t* load_address) | |
a445fddf | 1922 | { |
a445fddf | 1923 | uint64_t address; |
1e5d2fb1 DK |
1924 | uint64_t old_dot_value = *dot_value; |
1925 | uint64_t old_load_address = *load_address; | |
1926 | ||
77e65537 ILT |
1927 | if (this->address_ == NULL) |
1928 | address = *dot_value; | |
a445fddf ILT |
1929 | else |
1930 | { | |
77e65537 | 1931 | Output_section* dummy; |
919ed24c ILT |
1932 | address = this->address_->eval_with_dot(symtab, layout, true, |
1933 | *dot_value, NULL, &dummy); | |
a445fddf ILT |
1934 | } |
1935 | ||
1936 | uint64_t align; | |
1937 | if (this->align_ == NULL) | |
1938 | { | |
1939 | if (this->output_section_ == NULL) | |
1940 | align = 0; | |
1941 | else | |
1942 | align = this->output_section_->addralign(); | |
1943 | } | |
1944 | else | |
1945 | { | |
77e65537 | 1946 | Output_section* align_section; |
919ed24c | 1947 | align = this->align_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 ILT |
1948 | NULL, &align_section); |
1949 | if (align_section != NULL) | |
1950 | gold_warning(_("alignment of section %s is not absolute"), | |
1951 | this->name_.c_str()); | |
a445fddf ILT |
1952 | if (this->output_section_ != NULL) |
1953 | this->output_section_->set_addralign(align); | |
1954 | } | |
1955 | ||
1956 | address = align_address(address, align); | |
1957 | ||
fd247bfe ILT |
1958 | uint64_t start_address = address; |
1959 | ||
a445fddf | 1960 | *dot_value = address; |
a445fddf | 1961 | |
1e5d2fb1 DK |
1962 | // Except for NOLOAD sections, the address of non-SHF_ALLOC sections is |
1963 | // forced to zero, regardless of what the linker script wants. | |
a445fddf | 1964 | if (this->output_section_ != NULL |
1e5d2fb1 DK |
1965 | && ((this->output_section_->flags() & elfcpp::SHF_ALLOC) != 0 |
1966 | || this->output_section_->is_noload())) | |
a445fddf ILT |
1967 | this->output_section_->set_address(address); |
1968 | ||
8f2eb564 ILT |
1969 | this->evaluated_address_ = address; |
1970 | this->evaluated_addralign_ = align; | |
1971 | ||
1972 | if (this->load_address_ == NULL) | |
1973 | this->evaluated_load_address_ = address; | |
1974 | else | |
a445fddf | 1975 | { |
77e65537 | 1976 | Output_section* dummy; |
55458500 | 1977 | uint64_t laddr = |
919ed24c | 1978 | this->load_address_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 | 1979 | this->output_section_, &dummy); |
8f2eb564 | 1980 | if (this->output_section_ != NULL) |
55458500 ILT |
1981 | this->output_section_->set_load_address(laddr); |
1982 | this->evaluated_load_address_ = laddr; | |
a445fddf ILT |
1983 | } |
1984 | ||
1985 | uint64_t subalign; | |
1986 | if (this->subalign_ == NULL) | |
1987 | subalign = 0; | |
1988 | else | |
1989 | { | |
77e65537 | 1990 | Output_section* subalign_section; |
919ed24c ILT |
1991 | subalign = this->subalign_->eval_with_dot(symtab, layout, true, |
1992 | *dot_value, NULL, | |
1993 | &subalign_section); | |
77e65537 ILT |
1994 | if (subalign_section != NULL) |
1995 | gold_warning(_("subalign of section %s is not absolute"), | |
1996 | this->name_.c_str()); | |
a445fddf ILT |
1997 | } |
1998 | ||
1999 | std::string fill; | |
2000 | if (this->fill_ != NULL) | |
2001 | { | |
2002 | // FIXME: The GNU linker supports fill values of arbitrary | |
2003 | // length. | |
77e65537 | 2004 | Output_section* fill_section; |
919ed24c | 2005 | uint64_t fill_val = this->fill_->eval_with_dot(symtab, layout, true, |
a445fddf | 2006 | *dot_value, |
77e65537 ILT |
2007 | NULL, |
2008 | &fill_section); | |
2009 | if (fill_section != NULL) | |
2010 | gold_warning(_("fill of section %s is not absolute"), | |
2011 | this->name_.c_str()); | |
a445fddf ILT |
2012 | unsigned char fill_buff[4]; |
2013 | elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val); | |
2014 | fill.assign(reinterpret_cast<char*>(fill_buff), 4); | |
2015 | } | |
2016 | ||
2017 | Input_section_list input_sections; | |
2018 | if (this->output_section_ != NULL) | |
2019 | { | |
2020 | // Get the list of input sections attached to this output | |
2021 | // section. This will leave the output section with only | |
2022 | // Output_section_data entries. | |
2023 | address += this->output_section_->get_input_sections(address, | |
2024 | fill, | |
2025 | &input_sections); | |
2026 | *dot_value = address; | |
2027 | } | |
2028 | ||
77e65537 | 2029 | Output_section* dot_section = this->output_section_; |
a445fddf ILT |
2030 | for (Output_section_elements::iterator p = this->elements_.begin(); |
2031 | p != this->elements_.end(); | |
2032 | ++p) | |
2033 | (*p)->set_section_addresses(symtab, layout, this->output_section_, | |
77e65537 ILT |
2034 | subalign, dot_value, &dot_section, &fill, |
2035 | &input_sections); | |
a445fddf ILT |
2036 | |
2037 | gold_assert(input_sections.empty()); | |
fd247bfe ILT |
2038 | |
2039 | if (this->load_address_ == NULL || this->output_section_ == NULL) | |
2040 | *load_address = *dot_value; | |
2041 | else | |
2042 | *load_address = (this->output_section_->load_address() | |
2043 | + (*dot_value - start_address)); | |
2d924fd9 ILT |
2044 | |
2045 | if (this->output_section_ != NULL) | |
2046 | { | |
2047 | if (this->is_relro_) | |
2048 | this->output_section_->set_is_relro(); | |
2049 | else | |
2050 | this->output_section_->clear_is_relro(); | |
1e5d2fb1 DK |
2051 | |
2052 | // If this is a NOLOAD section, keep dot and load address unchanged. | |
2053 | if (this->output_section_->is_noload()) | |
2054 | { | |
2055 | *dot_value = old_dot_value; | |
2056 | *load_address = old_load_address; | |
2057 | } | |
2d924fd9 | 2058 | } |
a445fddf ILT |
2059 | } |
2060 | ||
3802b2dd ILT |
2061 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
2062 | // this section is constrained, and the input sections do not match, | |
2063 | // return the constraint, and set *POSD. | |
2064 | ||
2065 | Section_constraint | |
2066 | Output_section_definition::check_constraint(Output_section_definition** posd) | |
2067 | { | |
2068 | switch (this->constraint_) | |
2069 | { | |
2070 | case CONSTRAINT_NONE: | |
2071 | return CONSTRAINT_NONE; | |
2072 | ||
2073 | case CONSTRAINT_ONLY_IF_RO: | |
2074 | if (this->output_section_ != NULL | |
2075 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) != 0) | |
2076 | { | |
2077 | *posd = this; | |
2078 | return CONSTRAINT_ONLY_IF_RO; | |
2079 | } | |
2080 | return CONSTRAINT_NONE; | |
2081 | ||
2082 | case CONSTRAINT_ONLY_IF_RW: | |
2083 | if (this->output_section_ != NULL | |
2084 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) == 0) | |
2085 | { | |
2086 | *posd = this; | |
2087 | return CONSTRAINT_ONLY_IF_RW; | |
2088 | } | |
2089 | return CONSTRAINT_NONE; | |
2090 | ||
2091 | case CONSTRAINT_SPECIAL: | |
2092 | if (this->output_section_ != NULL) | |
2093 | gold_error(_("SPECIAL constraints are not implemented")); | |
2094 | return CONSTRAINT_NONE; | |
2095 | ||
2096 | default: | |
2097 | gold_unreachable(); | |
2098 | } | |
2099 | } | |
2100 | ||
2101 | // See if this is the alternate output section for a constrained | |
2102 | // output section. If it is, transfer the Output_section and return | |
2103 | // true. Otherwise return false. | |
2104 | ||
2105 | bool | |
2106 | Output_section_definition::alternate_constraint( | |
2107 | Output_section_definition* posd, | |
2108 | Section_constraint constraint) | |
2109 | { | |
2110 | if (this->name_ != posd->name_) | |
2111 | return false; | |
2112 | ||
2113 | switch (constraint) | |
2114 | { | |
2115 | case CONSTRAINT_ONLY_IF_RO: | |
2116 | if (this->constraint_ != CONSTRAINT_ONLY_IF_RW) | |
2117 | return false; | |
2118 | break; | |
2119 | ||
2120 | case CONSTRAINT_ONLY_IF_RW: | |
2121 | if (this->constraint_ != CONSTRAINT_ONLY_IF_RO) | |
2122 | return false; | |
2123 | break; | |
2124 | ||
2125 | default: | |
2126 | gold_unreachable(); | |
2127 | } | |
2128 | ||
2129 | // We have found the alternate constraint. We just need to move | |
2130 | // over the Output_section. When constraints are used properly, | |
2131 | // THIS should not have an output_section pointer, as all the input | |
2132 | // sections should have matched the other definition. | |
2133 | ||
2134 | if (this->output_section_ != NULL) | |
2135 | gold_error(_("mismatched definition for constrained sections")); | |
2136 | ||
2137 | this->output_section_ = posd->output_section_; | |
2138 | posd->output_section_ = NULL; | |
2139 | ||
2d924fd9 ILT |
2140 | if (this->is_relro_) |
2141 | this->output_section_->set_is_relro(); | |
2142 | else | |
2143 | this->output_section_->clear_is_relro(); | |
2144 | ||
3802b2dd ILT |
2145 | return true; |
2146 | } | |
2147 | ||
1c4f3631 | 2148 | // Get the list of segments to use for an allocated section when using |
2cefc357 | 2149 | // a PHDRS clause. |
1c4f3631 ILT |
2150 | |
2151 | Output_section* | |
2cefc357 ILT |
2152 | Output_section_definition::allocate_to_segment(String_list** phdrs_list, |
2153 | bool* orphan) | |
1c4f3631 ILT |
2154 | { |
2155 | if (this->output_section_ == NULL) | |
2156 | return NULL; | |
2157 | if ((this->output_section_->flags() & elfcpp::SHF_ALLOC) == 0) | |
2158 | return NULL; | |
2cefc357 | 2159 | *orphan = false; |
1c4f3631 ILT |
2160 | if (this->phdrs_ != NULL) |
2161 | *phdrs_list = this->phdrs_; | |
2162 | return this->output_section_; | |
2163 | } | |
2164 | ||
8f2eb564 ILT |
2165 | // Look for an output section by name and return the address, the load |
2166 | // address, the alignment, and the size. This is used when an | |
2167 | // expression refers to an output section which was not actually | |
2168 | // created. This returns true if the section was found, false | |
2169 | // otherwise. | |
2170 | ||
2171 | bool | |
2172 | Output_section_definition::get_output_section_info(const char* name, | |
2173 | uint64_t* address, | |
2174 | uint64_t* load_address, | |
2ea97941 | 2175 | uint64_t* addralign, |
8f2eb564 ILT |
2176 | uint64_t* size) const |
2177 | { | |
2178 | if (this->name_ != name) | |
2179 | return false; | |
2180 | ||
2181 | if (this->output_section_ != NULL) | |
2182 | { | |
2183 | *address = this->output_section_->address(); | |
2184 | if (this->output_section_->has_load_address()) | |
2185 | *load_address = this->output_section_->load_address(); | |
2186 | else | |
2187 | *load_address = *address; | |
2ea97941 | 2188 | *addralign = this->output_section_->addralign(); |
8f2eb564 ILT |
2189 | *size = this->output_section_->current_data_size(); |
2190 | } | |
2191 | else | |
2192 | { | |
2193 | *address = this->evaluated_address_; | |
2194 | *load_address = this->evaluated_load_address_; | |
2ea97941 | 2195 | *addralign = this->evaluated_addralign_; |
8f2eb564 ILT |
2196 | *size = 0; |
2197 | } | |
2198 | ||
2199 | return true; | |
2200 | } | |
2201 | ||
494e05f4 ILT |
2202 | // Print for debugging. |
2203 | ||
2204 | void | |
2205 | Output_section_definition::print(FILE* f) const | |
2206 | { | |
2207 | fprintf(f, " %s ", this->name_.c_str()); | |
2208 | ||
2209 | if (this->address_ != NULL) | |
2210 | { | |
2211 | this->address_->print(f); | |
2212 | fprintf(f, " "); | |
2213 | } | |
2214 | ||
1e5d2fb1 DK |
2215 | if (this->script_section_type_ != SCRIPT_SECTION_TYPE_NONE) |
2216 | fprintf(f, "(%s) ", | |
2217 | this->script_section_type_name(this->script_section_type_)); | |
2218 | ||
494e05f4 ILT |
2219 | fprintf(f, ": "); |
2220 | ||
2221 | if (this->load_address_ != NULL) | |
2222 | { | |
2223 | fprintf(f, "AT("); | |
2224 | this->load_address_->print(f); | |
2225 | fprintf(f, ") "); | |
2226 | } | |
2227 | ||
2228 | if (this->align_ != NULL) | |
2229 | { | |
2230 | fprintf(f, "ALIGN("); | |
2231 | this->align_->print(f); | |
2232 | fprintf(f, ") "); | |
2233 | } | |
2234 | ||
2235 | if (this->subalign_ != NULL) | |
2236 | { | |
2237 | fprintf(f, "SUBALIGN("); | |
2238 | this->subalign_->print(f); | |
2239 | fprintf(f, ") "); | |
2240 | } | |
2241 | ||
2242 | fprintf(f, "{\n"); | |
2243 | ||
2244 | for (Output_section_elements::const_iterator p = this->elements_.begin(); | |
2245 | p != this->elements_.end(); | |
2246 | ++p) | |
2247 | (*p)->print(f); | |
2248 | ||
2249 | fprintf(f, " }"); | |
2250 | ||
2251 | if (this->fill_ != NULL) | |
2252 | { | |
2253 | fprintf(f, " = "); | |
2254 | this->fill_->print(f); | |
2255 | } | |
2256 | ||
7d26c6cc ILT |
2257 | if (this->phdrs_ != NULL) |
2258 | { | |
2259 | for (String_list::const_iterator p = this->phdrs_->begin(); | |
2260 | p != this->phdrs_->end(); | |
2261 | ++p) | |
2262 | fprintf(f, " :%s", p->c_str()); | |
2263 | } | |
2264 | ||
494e05f4 ILT |
2265 | fprintf(f, "\n"); |
2266 | } | |
2267 | ||
1e5d2fb1 DK |
2268 | Script_sections::Section_type |
2269 | Output_section_definition::section_type() const | |
2270 | { | |
2271 | switch (this->script_section_type_) | |
2272 | { | |
2273 | case SCRIPT_SECTION_TYPE_NONE: | |
2274 | return Script_sections::ST_NONE; | |
2275 | case SCRIPT_SECTION_TYPE_NOLOAD: | |
2276 | return Script_sections::ST_NOLOAD; | |
2277 | case SCRIPT_SECTION_TYPE_COPY: | |
2278 | case SCRIPT_SECTION_TYPE_DSECT: | |
2279 | case SCRIPT_SECTION_TYPE_INFO: | |
2280 | case SCRIPT_SECTION_TYPE_OVERLAY: | |
2281 | // There are not really support so we treat them as ST_NONE. The | |
2282 | // parse should have issued errors for them already. | |
2283 | return Script_sections::ST_NONE; | |
2284 | default: | |
2285 | gold_unreachable(); | |
2286 | } | |
2287 | } | |
2288 | ||
2289 | // Return the name of a script section type. | |
2290 | ||
2291 | const char* | |
2292 | Output_section_definition::script_section_type_name ( | |
2293 | Script_section_type script_section_type) | |
2294 | { | |
2295 | switch (script_section_type) | |
2296 | { | |
2297 | case SCRIPT_SECTION_TYPE_NONE: | |
2298 | return "NONE"; | |
2299 | case SCRIPT_SECTION_TYPE_NOLOAD: | |
2300 | return "NOLOAD"; | |
2301 | case SCRIPT_SECTION_TYPE_DSECT: | |
2302 | return "DSECT"; | |
2303 | case SCRIPT_SECTION_TYPE_COPY: | |
2304 | return "COPY"; | |
2305 | case SCRIPT_SECTION_TYPE_INFO: | |
2306 | return "INFO"; | |
2307 | case SCRIPT_SECTION_TYPE_OVERLAY: | |
2308 | return "OVERLAY"; | |
2309 | default: | |
2310 | gold_unreachable(); | |
2311 | } | |
2312 | } | |
2313 | ||
a445fddf ILT |
2314 | // An output section created to hold orphaned input sections. These |
2315 | // do not actually appear in linker scripts. However, for convenience | |
2316 | // when setting the output section addresses, we put a marker to these | |
2317 | // sections in the appropriate place in the list of SECTIONS elements. | |
2318 | ||
2319 | class Orphan_output_section : public Sections_element | |
2320 | { | |
2321 | public: | |
2322 | Orphan_output_section(Output_section* os) | |
2323 | : os_(os) | |
2324 | { } | |
2325 | ||
0d371ad3 ILT |
2326 | // Return whether the orphan output section is relro. We can just |
2327 | // check the output section because we always set the flag, if | |
2328 | // needed, just after we create the Orphan_output_section. | |
a445fddf | 2329 | bool |
0d371ad3 ILT |
2330 | is_relro() const |
2331 | { return this->os_->is_relro(); } | |
2332 | ||
2333 | // Initialize OSP with an output section. This should have been | |
2334 | // done already. | |
2335 | void | |
2336 | orphan_section_init(Orphan_section_placement*, | |
2337 | Script_sections::Elements_iterator) | |
2338 | { gold_unreachable(); } | |
a445fddf ILT |
2339 | |
2340 | // Set section addresses. | |
2341 | void | |
fd247bfe | 2342 | set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*); |
a445fddf | 2343 | |
1c4f3631 | 2344 | // Get the list of segments to use for an allocated section when |
2cefc357 | 2345 | // using a PHDRS clause. |
1c4f3631 | 2346 | Output_section* |
2cefc357 | 2347 | allocate_to_segment(String_list**, bool*); |
1c4f3631 | 2348 | |
2d924fd9 ILT |
2349 | // Return the associated Output_section. |
2350 | Output_section* | |
2351 | get_output_section() const | |
2352 | { return this->os_; } | |
2353 | ||
a445fddf ILT |
2354 | // Print for debugging. |
2355 | void | |
2356 | print(FILE* f) const | |
2357 | { | |
2358 | fprintf(f, " marker for orphaned output section %s\n", | |
2359 | this->os_->name()); | |
2360 | } | |
2361 | ||
2362 | private: | |
2363 | Output_section* os_; | |
2364 | }; | |
2365 | ||
a445fddf ILT |
2366 | // Set section addresses. |
2367 | ||
2368 | void | |
2369 | Orphan_output_section::set_section_addresses(Symbol_table*, Layout*, | |
fd247bfe ILT |
2370 | uint64_t* dot_value, |
2371 | uint64_t* load_address) | |
a445fddf | 2372 | { |
20e6d0d6 | 2373 | typedef std::list<Output_section::Simple_input_section> Input_section_list; |
a445fddf | 2374 | |
fd247bfe ILT |
2375 | bool have_load_address = *load_address != *dot_value; |
2376 | ||
a445fddf ILT |
2377 | uint64_t address = *dot_value; |
2378 | address = align_address(address, this->os_->addralign()); | |
2379 | ||
2380 | if ((this->os_->flags() & elfcpp::SHF_ALLOC) != 0) | |
fd247bfe ILT |
2381 | { |
2382 | this->os_->set_address(address); | |
2383 | if (have_load_address) | |
2384 | this->os_->set_load_address(align_address(*load_address, | |
2385 | this->os_->addralign())); | |
2386 | } | |
a445fddf ILT |
2387 | |
2388 | Input_section_list input_sections; | |
2389 | address += this->os_->get_input_sections(address, "", &input_sections); | |
2390 | ||
2391 | for (Input_section_list::iterator p = input_sections.begin(); | |
2392 | p != input_sections.end(); | |
2393 | ++p) | |
2394 | { | |
2ea97941 | 2395 | uint64_t addralign; |
a445fddf ILT |
2396 | uint64_t size; |
2397 | ||
6c93b22c | 2398 | // We know we are single-threaded, so it is OK to lock the |
a445fddf ILT |
2399 | // object. |
2400 | { | |
2401 | const Task* task = reinterpret_cast<const Task*>(-1); | |
20e6d0d6 | 2402 | Task_lock_obj<Object> tl(task, p->relobj()); |
2ea97941 | 2403 | addralign = p->relobj()->section_addralign(p->shndx()); |
20e6d0d6 | 2404 | if (p->is_relaxed_input_section()) |
c0a62865 DK |
2405 | // We use current data size because relxed section sizes may not |
2406 | // have finalized yet. | |
2407 | size = p->relaxed_input_section()->current_data_size(); | |
20e6d0d6 DK |
2408 | else |
2409 | size = p->relobj()->section_size(p->shndx()); | |
a445fddf ILT |
2410 | } |
2411 | ||
2ea97941 | 2412 | address = align_address(address, addralign); |
8923b24c | 2413 | this->os_->add_simple_input_section(*p, size, addralign); |
a445fddf ILT |
2414 | address += size; |
2415 | } | |
2416 | ||
661be1e2 ILT |
2417 | // An SHF_TLS/SHT_NOBITS section does not take up any address space. |
2418 | if (this->os_ == NULL | |
2419 | || (this->os_->flags() & elfcpp::SHF_TLS) == 0 | |
2420 | || this->os_->type() != elfcpp::SHT_NOBITS) | |
2421 | { | |
2422 | if (!have_load_address) | |
2423 | *load_address = address; | |
2424 | else | |
2425 | *load_address += address - *dot_value; | |
fd247bfe | 2426 | |
661be1e2 ILT |
2427 | *dot_value = address; |
2428 | } | |
a445fddf ILT |
2429 | } |
2430 | ||
1c4f3631 ILT |
2431 | // Get the list of segments to use for an allocated section when using |
2432 | // a PHDRS clause. If this is an allocated section, return the | |
2433 | // Output_section. We don't change the list of segments. | |
2434 | ||
2435 | Output_section* | |
2cefc357 | 2436 | Orphan_output_section::allocate_to_segment(String_list**, bool* orphan) |
1c4f3631 ILT |
2437 | { |
2438 | if ((this->os_->flags() & elfcpp::SHF_ALLOC) == 0) | |
2439 | return NULL; | |
2cefc357 | 2440 | *orphan = true; |
1c4f3631 ILT |
2441 | return this->os_; |
2442 | } | |
2443 | ||
2444 | // Class Phdrs_element. A program header from a PHDRS clause. | |
2445 | ||
2446 | class Phdrs_element | |
2447 | { | |
2448 | public: | |
2ea97941 ILT |
2449 | Phdrs_element(const char* name, size_t namelen, unsigned int type, |
2450 | bool includes_filehdr, bool includes_phdrs, | |
1c4f3631 | 2451 | bool is_flags_valid, unsigned int flags, |
2ea97941 ILT |
2452 | Expression* load_address) |
2453 | : name_(name, namelen), type_(type), includes_filehdr_(includes_filehdr), | |
2454 | includes_phdrs_(includes_phdrs), is_flags_valid_(is_flags_valid), | |
2455 | flags_(flags), load_address_(load_address), load_address_value_(0), | |
1c4f3631 ILT |
2456 | segment_(NULL) |
2457 | { } | |
2458 | ||
2459 | // Return the name of this segment. | |
2460 | const std::string& | |
2461 | name() const | |
2462 | { return this->name_; } | |
2463 | ||
2464 | // Return the type of the segment. | |
2465 | unsigned int | |
2466 | type() const | |
2467 | { return this->type_; } | |
2468 | ||
2469 | // Whether to include the file header. | |
2470 | bool | |
2471 | includes_filehdr() const | |
2472 | { return this->includes_filehdr_; } | |
2473 | ||
2474 | // Whether to include the program headers. | |
2475 | bool | |
2476 | includes_phdrs() const | |
2477 | { return this->includes_phdrs_; } | |
2478 | ||
2479 | // Return whether there is a load address. | |
2480 | bool | |
2481 | has_load_address() const | |
2482 | { return this->load_address_ != NULL; } | |
2483 | ||
2484 | // Evaluate the load address expression if there is one. | |
2485 | void | |
2ea97941 | 2486 | eval_load_address(Symbol_table* symtab, Layout* layout) |
1c4f3631 ILT |
2487 | { |
2488 | if (this->load_address_ != NULL) | |
2ea97941 | 2489 | this->load_address_value_ = this->load_address_->eval(symtab, layout, |
919ed24c | 2490 | true); |
1c4f3631 ILT |
2491 | } |
2492 | ||
2493 | // Return the load address. | |
2494 | uint64_t | |
2495 | load_address() const | |
2496 | { | |
2497 | gold_assert(this->load_address_ != NULL); | |
2498 | return this->load_address_value_; | |
2499 | } | |
2500 | ||
2501 | // Create the segment. | |
2502 | Output_segment* | |
2503 | create_segment(Layout* layout) | |
2504 | { | |
2505 | this->segment_ = layout->make_output_segment(this->type_, this->flags_); | |
2506 | return this->segment_; | |
2507 | } | |
2508 | ||
2509 | // Return the segment. | |
2510 | Output_segment* | |
2511 | segment() | |
2512 | { return this->segment_; } | |
2513 | ||
20e6d0d6 DK |
2514 | // Release the segment. |
2515 | void | |
2516 | release_segment() | |
2517 | { this->segment_ = NULL; } | |
2518 | ||
1c4f3631 ILT |
2519 | // Set the segment flags if appropriate. |
2520 | void | |
2521 | set_flags_if_valid() | |
2522 | { | |
2523 | if (this->is_flags_valid_) | |
2524 | this->segment_->set_flags(this->flags_); | |
2525 | } | |
2526 | ||
7d26c6cc ILT |
2527 | // Print for debugging. |
2528 | void | |
2529 | print(FILE*) const; | |
2530 | ||
1c4f3631 ILT |
2531 | private: |
2532 | // The name used in the script. | |
2533 | std::string name_; | |
2534 | // The type of the segment (PT_LOAD, etc.). | |
2535 | unsigned int type_; | |
2536 | // Whether this segment includes the file header. | |
2537 | bool includes_filehdr_; | |
2538 | // Whether this segment includes the section headers. | |
2539 | bool includes_phdrs_; | |
2540 | // Whether the flags were explicitly specified. | |
2541 | bool is_flags_valid_; | |
2542 | // The flags for this segment (PF_R, etc.) if specified. | |
2543 | unsigned int flags_; | |
2544 | // The expression for the load address for this segment. This may | |
2545 | // be NULL. | |
2546 | Expression* load_address_; | |
2547 | // The actual load address from evaluating the expression. | |
2548 | uint64_t load_address_value_; | |
2549 | // The segment itself. | |
2550 | Output_segment* segment_; | |
2551 | }; | |
2552 | ||
7d26c6cc ILT |
2553 | // Print for debugging. |
2554 | ||
2555 | void | |
2556 | Phdrs_element::print(FILE* f) const | |
2557 | { | |
2558 | fprintf(f, " %s 0x%x", this->name_.c_str(), this->type_); | |
2559 | if (this->includes_filehdr_) | |
2560 | fprintf(f, " FILEHDR"); | |
2561 | if (this->includes_phdrs_) | |
2562 | fprintf(f, " PHDRS"); | |
2563 | if (this->is_flags_valid_) | |
2564 | fprintf(f, " FLAGS(%u)", this->flags_); | |
2565 | if (this->load_address_ != NULL) | |
2566 | { | |
2567 | fprintf(f, " AT("); | |
2568 | this->load_address_->print(f); | |
2569 | fprintf(f, ")"); | |
2570 | } | |
2571 | fprintf(f, ";\n"); | |
2572 | } | |
2573 | ||
494e05f4 ILT |
2574 | // Class Script_sections. |
2575 | ||
2576 | Script_sections::Script_sections() | |
2577 | : saw_sections_clause_(false), | |
2578 | in_sections_clause_(false), | |
2579 | sections_elements_(NULL), | |
1c4f3631 | 2580 | output_section_(NULL), |
2d924fd9 | 2581 | phdrs_elements_(NULL), |
0d371ad3 ILT |
2582 | orphan_section_placement_(NULL), |
2583 | data_segment_align_start_(), | |
2584 | saw_data_segment_align_(false), | |
3c12dcdb DK |
2585 | saw_relro_end_(false), |
2586 | saw_segment_start_expression_(false) | |
494e05f4 ILT |
2587 | { |
2588 | } | |
2589 | ||
2590 | // Start a SECTIONS clause. | |
2591 | ||
2592 | void | |
2593 | Script_sections::start_sections() | |
2594 | { | |
2595 | gold_assert(!this->in_sections_clause_ && this->output_section_ == NULL); | |
2596 | this->saw_sections_clause_ = true; | |
2597 | this->in_sections_clause_ = true; | |
2598 | if (this->sections_elements_ == NULL) | |
2599 | this->sections_elements_ = new Sections_elements; | |
2600 | } | |
2601 | ||
2602 | // Finish a SECTIONS clause. | |
2603 | ||
2604 | void | |
2605 | Script_sections::finish_sections() | |
2606 | { | |
2607 | gold_assert(this->in_sections_clause_ && this->output_section_ == NULL); | |
2608 | this->in_sections_clause_ = false; | |
2609 | } | |
2610 | ||
2611 | // Add a symbol to be defined. | |
2612 | ||
2613 | void | |
2614 | Script_sections::add_symbol_assignment(const char* name, size_t length, | |
2615 | Expression* val, bool provide, | |
2616 | bool hidden) | |
2617 | { | |
2618 | if (this->output_section_ != NULL) | |
2619 | this->output_section_->add_symbol_assignment(name, length, val, | |
2620 | provide, hidden); | |
2621 | else | |
2622 | { | |
2623 | Sections_element* p = new Sections_element_assignment(name, length, | |
2624 | val, provide, | |
2625 | hidden); | |
2626 | this->sections_elements_->push_back(p); | |
2627 | } | |
2628 | } | |
2629 | ||
a445fddf ILT |
2630 | // Add an assignment to the special dot symbol. |
2631 | ||
2632 | void | |
2633 | Script_sections::add_dot_assignment(Expression* val) | |
2634 | { | |
2635 | if (this->output_section_ != NULL) | |
2636 | this->output_section_->add_dot_assignment(val); | |
2637 | else | |
2638 | { | |
12edd763 ILT |
2639 | // The GNU linker permits assignments to . to appears outside of |
2640 | // a SECTIONS clause, and treats it as appearing inside, so | |
2641 | // sections_elements_ may be NULL here. | |
2642 | if (this->sections_elements_ == NULL) | |
2643 | { | |
2644 | this->sections_elements_ = new Sections_elements; | |
2645 | this->saw_sections_clause_ = true; | |
2646 | } | |
2647 | ||
a445fddf ILT |
2648 | Sections_element* p = new Sections_element_dot_assignment(val); |
2649 | this->sections_elements_->push_back(p); | |
2650 | } | |
2651 | } | |
2652 | ||
494e05f4 ILT |
2653 | // Add an assertion. |
2654 | ||
2655 | void | |
2656 | Script_sections::add_assertion(Expression* check, const char* message, | |
2657 | size_t messagelen) | |
2658 | { | |
2659 | if (this->output_section_ != NULL) | |
2660 | this->output_section_->add_assertion(check, message, messagelen); | |
2661 | else | |
2662 | { | |
2663 | Sections_element* p = new Sections_element_assertion(check, message, | |
2664 | messagelen); | |
2665 | this->sections_elements_->push_back(p); | |
2666 | } | |
2667 | } | |
2668 | ||
2669 | // Start processing entries for an output section. | |
2670 | ||
2671 | void | |
2672 | Script_sections::start_output_section( | |
2673 | const char* name, | |
2674 | size_t namelen, | |
2675 | const Parser_output_section_header *header) | |
2676 | { | |
2677 | Output_section_definition* posd = new Output_section_definition(name, | |
2678 | namelen, | |
2679 | header); | |
2680 | this->sections_elements_->push_back(posd); | |
2681 | gold_assert(this->output_section_ == NULL); | |
2682 | this->output_section_ = posd; | |
2683 | } | |
2684 | ||
2685 | // Stop processing entries for an output section. | |
2686 | ||
2687 | void | |
2688 | Script_sections::finish_output_section( | |
2689 | const Parser_output_section_trailer* trailer) | |
2690 | { | |
2691 | gold_assert(this->output_section_ != NULL); | |
2692 | this->output_section_->finish(trailer); | |
2693 | this->output_section_ = NULL; | |
2694 | } | |
2695 | ||
2696 | // Add a data item to the current output section. | |
2697 | ||
2698 | void | |
2699 | Script_sections::add_data(int size, bool is_signed, Expression* val) | |
2700 | { | |
2701 | gold_assert(this->output_section_ != NULL); | |
2702 | this->output_section_->add_data(size, is_signed, val); | |
2703 | } | |
2704 | ||
2705 | // Add a fill value setting to the current output section. | |
2706 | ||
2707 | void | |
2708 | Script_sections::add_fill(Expression* val) | |
2709 | { | |
2710 | gold_assert(this->output_section_ != NULL); | |
2711 | this->output_section_->add_fill(val); | |
2712 | } | |
2713 | ||
2714 | // Add an input section specification to the current output section. | |
2715 | ||
2716 | void | |
2717 | Script_sections::add_input_section(const Input_section_spec* spec, bool keep) | |
2718 | { | |
2719 | gold_assert(this->output_section_ != NULL); | |
2720 | this->output_section_->add_input_section(spec, keep); | |
2721 | } | |
2722 | ||
2d924fd9 ILT |
2723 | // This is called when we see DATA_SEGMENT_ALIGN. It means that any |
2724 | // subsequent output sections may be relro. | |
2725 | ||
2726 | void | |
2727 | Script_sections::data_segment_align() | |
2728 | { | |
0d371ad3 | 2729 | if (this->saw_data_segment_align_) |
2d924fd9 | 2730 | gold_error(_("DATA_SEGMENT_ALIGN may only appear once in a linker script")); |
0d371ad3 ILT |
2731 | gold_assert(!this->sections_elements_->empty()); |
2732 | Sections_elements::iterator p = this->sections_elements_->end(); | |
2733 | --p; | |
2734 | this->data_segment_align_start_ = p; | |
2735 | this->saw_data_segment_align_ = true; | |
2d924fd9 ILT |
2736 | } |
2737 | ||
2738 | // This is called when we see DATA_SEGMENT_RELRO_END. It means that | |
2739 | // any output sections seen since DATA_SEGMENT_ALIGN are relro. | |
2740 | ||
2741 | void | |
2742 | Script_sections::data_segment_relro_end() | |
2743 | { | |
2744 | if (this->saw_relro_end_) | |
2745 | gold_error(_("DATA_SEGMENT_RELRO_END may only appear once " | |
2746 | "in a linker script")); | |
2747 | this->saw_relro_end_ = true; | |
2748 | ||
0d371ad3 | 2749 | if (!this->saw_data_segment_align_) |
2d924fd9 ILT |
2750 | gold_error(_("DATA_SEGMENT_RELRO_END must follow DATA_SEGMENT_ALIGN")); |
2751 | else | |
2752 | { | |
0d371ad3 ILT |
2753 | Sections_elements::iterator p = this->data_segment_align_start_; |
2754 | for (++p; p != this->sections_elements_->end(); ++p) | |
2755 | (*p)->set_is_relro(); | |
2d924fd9 ILT |
2756 | } |
2757 | } | |
2758 | ||
919ed24c ILT |
2759 | // Create any required sections. |
2760 | ||
2761 | void | |
2762 | Script_sections::create_sections(Layout* layout) | |
2763 | { | |
2764 | if (!this->saw_sections_clause_) | |
2765 | return; | |
2766 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2767 | p != this->sections_elements_->end(); | |
2768 | ++p) | |
2769 | (*p)->create_sections(layout); | |
2770 | } | |
2771 | ||
a445fddf ILT |
2772 | // Add any symbols we are defining to the symbol table. |
2773 | ||
2774 | void | |
2775 | Script_sections::add_symbols_to_table(Symbol_table* symtab) | |
2776 | { | |
2777 | if (!this->saw_sections_clause_) | |
2778 | return; | |
2779 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2780 | p != this->sections_elements_->end(); | |
2781 | ++p) | |
2782 | (*p)->add_symbols_to_table(symtab); | |
2783 | } | |
2784 | ||
2785 | // Finalize symbols and check assertions. | |
2786 | ||
2787 | void | |
2788 | Script_sections::finalize_symbols(Symbol_table* symtab, const Layout* layout) | |
2789 | { | |
2790 | if (!this->saw_sections_clause_) | |
2791 | return; | |
a445fddf ILT |
2792 | uint64_t dot_value = 0; |
2793 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2794 | p != this->sections_elements_->end(); | |
2795 | ++p) | |
77e65537 | 2796 | (*p)->finalize_symbols(symtab, layout, &dot_value); |
a445fddf ILT |
2797 | } |
2798 | ||
2799 | // Return the name of the output section to use for an input file name | |
2800 | // and section name. | |
2801 | ||
2802 | const char* | |
1e5d2fb1 DK |
2803 | Script_sections::output_section_name( |
2804 | const char* file_name, | |
2805 | const char* section_name, | |
2806 | Output_section*** output_section_slot, | |
2807 | Script_sections::Section_type *psection_type) | |
a445fddf ILT |
2808 | { |
2809 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
2810 | p != this->sections_elements_->end(); | |
2811 | ++p) | |
2812 | { | |
2813 | const char* ret = (*p)->output_section_name(file_name, section_name, | |
1e5d2fb1 DK |
2814 | output_section_slot, |
2815 | psection_type); | |
a445fddf ILT |
2816 | |
2817 | if (ret != NULL) | |
2818 | { | |
2819 | // The special name /DISCARD/ means that the input section | |
2820 | // should be discarded. | |
2821 | if (strcmp(ret, "/DISCARD/") == 0) | |
2822 | { | |
2823 | *output_section_slot = NULL; | |
1e5d2fb1 | 2824 | *psection_type = Script_sections::ST_NONE; |
a445fddf ILT |
2825 | return NULL; |
2826 | } | |
2827 | return ret; | |
2828 | } | |
2829 | } | |
2830 | ||
2831 | // If we couldn't find a mapping for the name, the output section | |
2832 | // gets the name of the input section. | |
2833 | ||
2834 | *output_section_slot = NULL; | |
1e5d2fb1 | 2835 | *psection_type = Script_sections::ST_NONE; |
a445fddf ILT |
2836 | |
2837 | return section_name; | |
2838 | } | |
2839 | ||
2840 | // Place a marker for an orphan output section into the SECTIONS | |
2841 | // clause. | |
2842 | ||
2843 | void | |
2844 | Script_sections::place_orphan(Output_section* os) | |
2845 | { | |
0d371ad3 ILT |
2846 | Orphan_section_placement* osp = this->orphan_section_placement_; |
2847 | if (osp == NULL) | |
a445fddf | 2848 | { |
0d371ad3 ILT |
2849 | // Initialize the Orphan_section_placement structure. |
2850 | osp = new Orphan_section_placement(); | |
2851 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2852 | p != this->sections_elements_->end(); | |
2853 | ++p) | |
2854 | (*p)->orphan_section_init(osp, p); | |
2855 | gold_assert(!this->sections_elements_->empty()); | |
2856 | Sections_elements::iterator last = this->sections_elements_->end(); | |
2857 | --last; | |
2858 | osp->last_init(last); | |
2859 | this->orphan_section_placement_ = osp; | |
a445fddf ILT |
2860 | } |
2861 | ||
0d371ad3 | 2862 | Orphan_output_section* orphan = new Orphan_output_section(os); |
2d924fd9 | 2863 | |
0d371ad3 ILT |
2864 | // Look for where to put ORPHAN. |
2865 | Sections_elements::iterator* where; | |
2866 | if (osp->find_place(os, &where)) | |
2867 | { | |
2868 | if ((**where)->is_relro()) | |
2869 | os->set_is_relro(); | |
2870 | else | |
2871 | os->clear_is_relro(); | |
2872 | ||
2873 | // We want to insert ORPHAN after *WHERE, and then update *WHERE | |
2874 | // so that the next one goes after this one. | |
2875 | Sections_elements::iterator p = *where; | |
2876 | gold_assert(p != this->sections_elements_->end()); | |
2877 | ++p; | |
2878 | *where = this->sections_elements_->insert(p, orphan); | |
2879 | } | |
2d924fd9 | 2880 | else |
0d371ad3 ILT |
2881 | { |
2882 | os->clear_is_relro(); | |
2883 | // We don't have a place to put this orphan section. Put it, | |
2884 | // and all other sections like it, at the end, but before the | |
2885 | // sections which always come at the end. | |
2886 | Sections_elements::iterator last = osp->last_place(); | |
2887 | *where = this->sections_elements_->insert(last, orphan); | |
2888 | } | |
a445fddf ILT |
2889 | } |
2890 | ||
2891 | // Set the addresses of all the output sections. Walk through all the | |
2892 | // elements, tracking the dot symbol. Apply assignments which set | |
2893 | // absolute symbol values, in case they are used when setting dot. | |
2894 | // Fill in data statement values. As we find output sections, set the | |
2895 | // address, set the address of all associated input sections, and | |
2896 | // update dot. Return the segment which should hold the file header | |
2897 | // and segment headers, if any. | |
2898 | ||
2899 | Output_segment* | |
2900 | Script_sections::set_section_addresses(Symbol_table* symtab, Layout* layout) | |
2901 | { | |
2902 | gold_assert(this->saw_sections_clause_); | |
2903 | ||
3802b2dd ILT |
2904 | // Implement ONLY_IF_RO/ONLY_IF_RW constraints. These are a pain |
2905 | // for our representation. | |
2906 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2907 | p != this->sections_elements_->end(); | |
2908 | ++p) | |
2909 | { | |
2910 | Output_section_definition* posd; | |
2911 | Section_constraint failed_constraint = (*p)->check_constraint(&posd); | |
2912 | if (failed_constraint != CONSTRAINT_NONE) | |
2913 | { | |
2914 | Sections_elements::iterator q; | |
2915 | for (q = this->sections_elements_->begin(); | |
2916 | q != this->sections_elements_->end(); | |
2917 | ++q) | |
2918 | { | |
2919 | if (q != p) | |
2920 | { | |
2921 | if ((*q)->alternate_constraint(posd, failed_constraint)) | |
2922 | break; | |
2923 | } | |
2924 | } | |
2925 | ||
2926 | if (q == this->sections_elements_->end()) | |
2927 | gold_error(_("no matching section constraint")); | |
2928 | } | |
2929 | } | |
2930 | ||
2d924fd9 ILT |
2931 | // Force the alignment of the first TLS section to be the maximum |
2932 | // alignment of all TLS sections. | |
2933 | Output_section* first_tls = NULL; | |
2934 | uint64_t tls_align = 0; | |
2935 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
2936 | p != this->sections_elements_->end(); | |
2937 | ++p) | |
2938 | { | |
2939 | Output_section *os = (*p)->get_output_section(); | |
2940 | if (os != NULL && (os->flags() & elfcpp::SHF_TLS) != 0) | |
2941 | { | |
2942 | if (first_tls == NULL) | |
2943 | first_tls = os; | |
2944 | if (os->addralign() > tls_align) | |
2945 | tls_align = os->addralign(); | |
2946 | } | |
2947 | } | |
2948 | if (first_tls != NULL) | |
2949 | first_tls->set_addralign(tls_align); | |
2950 | ||
77e65537 | 2951 | // For a relocatable link, we implicitly set dot to zero. |
a445fddf | 2952 | uint64_t dot_value = 0; |
fd247bfe | 2953 | uint64_t load_address = 0; |
3c12dcdb DK |
2954 | |
2955 | // Check to see if we want to use any of -Ttext, -Tdata and -Tbss options | |
2956 | // to set section addresses. If the script has any SEGMENT_START | |
2957 | // expression, we do not set the section addresses. | |
2958 | bool use_tsection_options = | |
2959 | (!this->saw_segment_start_expression_ | |
2960 | && (parameters->options().user_set_Ttext() | |
2961 | || parameters->options().user_set_Tdata() | |
2962 | || parameters->options().user_set_Tbss())); | |
2963 | ||
a445fddf ILT |
2964 | for (Sections_elements::iterator p = this->sections_elements_->begin(); |
2965 | p != this->sections_elements_->end(); | |
2966 | ++p) | |
3c12dcdb DK |
2967 | { |
2968 | Output_section* os = (*p)->get_output_section(); | |
2969 | ||
2970 | // Handle -Ttext, -Tdata and -Tbss options. We do this by looking for | |
2971 | // the special sections by names and doing dot assignments. | |
2972 | if (use_tsection_options | |
2973 | && os != NULL | |
2974 | && (os->flags() & elfcpp::SHF_ALLOC) != 0) | |
2975 | { | |
2976 | uint64_t new_dot_value = dot_value; | |
2977 | ||
2978 | if (parameters->options().user_set_Ttext() | |
2979 | && strcmp(os->name(), ".text") == 0) | |
2980 | new_dot_value = parameters->options().Ttext(); | |
2981 | else if (parameters->options().user_set_Tdata() | |
2982 | && strcmp(os->name(), ".data") == 0) | |
2983 | new_dot_value = parameters->options().Tdata(); | |
2984 | else if (parameters->options().user_set_Tbss() | |
2985 | && strcmp(os->name(), ".bss") == 0) | |
2986 | new_dot_value = parameters->options().Tbss(); | |
2987 | ||
2988 | // Update dot and load address if necessary. | |
2989 | if (new_dot_value < dot_value) | |
2990 | gold_error(_("dot may not move backward")); | |
2991 | else if (new_dot_value != dot_value) | |
2992 | { | |
2993 | dot_value = new_dot_value; | |
2994 | load_address = new_dot_value; | |
2995 | } | |
2996 | } | |
2997 | ||
2998 | (*p)->set_section_addresses(symtab, layout, &dot_value, &load_address); | |
2999 | } | |
a445fddf | 3000 | |
1c4f3631 ILT |
3001 | if (this->phdrs_elements_ != NULL) |
3002 | { | |
3003 | for (Phdrs_elements::iterator p = this->phdrs_elements_->begin(); | |
3004 | p != this->phdrs_elements_->end(); | |
3005 | ++p) | |
3006 | (*p)->eval_load_address(symtab, layout); | |
3007 | } | |
3008 | ||
a445fddf ILT |
3009 | return this->create_segments(layout); |
3010 | } | |
3011 | ||
3012 | // Sort the sections in order to put them into segments. | |
3013 | ||
3014 | class Sort_output_sections | |
3015 | { | |
3016 | public: | |
3017 | bool | |
3018 | operator()(const Output_section* os1, const Output_section* os2) const; | |
3019 | }; | |
3020 | ||
3021 | bool | |
3022 | Sort_output_sections::operator()(const Output_section* os1, | |
3023 | const Output_section* os2) const | |
3024 | { | |
3025 | // Sort first by the load address. | |
3026 | uint64_t lma1 = (os1->has_load_address() | |
3027 | ? os1->load_address() | |
3028 | : os1->address()); | |
3029 | uint64_t lma2 = (os2->has_load_address() | |
3030 | ? os2->load_address() | |
3031 | : os2->address()); | |
3032 | if (lma1 != lma2) | |
3033 | return lma1 < lma2; | |
3034 | ||
3035 | // Then sort by the virtual address. | |
3036 | if (os1->address() != os2->address()) | |
3037 | return os1->address() < os2->address(); | |
3038 | ||
3039 | // Sort TLS sections to the end. | |
3040 | bool tls1 = (os1->flags() & elfcpp::SHF_TLS) != 0; | |
3041 | bool tls2 = (os2->flags() & elfcpp::SHF_TLS) != 0; | |
3042 | if (tls1 != tls2) | |
3043 | return tls2; | |
3044 | ||
3045 | // Sort PROGBITS before NOBITS. | |
3046 | if (os1->type() == elfcpp::SHT_PROGBITS && os2->type() == elfcpp::SHT_NOBITS) | |
3047 | return true; | |
3048 | if (os1->type() == elfcpp::SHT_NOBITS && os2->type() == elfcpp::SHT_PROGBITS) | |
3049 | return false; | |
3050 | ||
1e5d2fb1 DK |
3051 | // Sort non-NOLOAD before NOLOAD. |
3052 | if (os1->is_noload() && !os2->is_noload()) | |
3053 | return true; | |
3054 | if (!os1->is_noload() && os2->is_noload()) | |
3055 | return true; | |
3056 | ||
a445fddf ILT |
3057 | // Otherwise we don't care. |
3058 | return false; | |
3059 | } | |
3060 | ||
3061 | // Return whether OS is a BSS section. This is a SHT_NOBITS section. | |
3062 | // We treat a section with the SHF_TLS flag set as taking up space | |
3063 | // even if it is SHT_NOBITS (this is true of .tbss), as we allocate | |
3064 | // space for them in the file. | |
3065 | ||
3066 | bool | |
3067 | Script_sections::is_bss_section(const Output_section* os) | |
3068 | { | |
3069 | return (os->type() == elfcpp::SHT_NOBITS | |
3070 | && (os->flags() & elfcpp::SHF_TLS) == 0); | |
3071 | } | |
3072 | ||
1c4f3631 ILT |
3073 | // Return the size taken by the file header and the program headers. |
3074 | ||
3075 | size_t | |
3076 | Script_sections::total_header_size(Layout* layout) const | |
3077 | { | |
3078 | size_t segment_count = layout->segment_count(); | |
3079 | size_t file_header_size; | |
3080 | size_t segment_headers_size; | |
8851ecca | 3081 | if (parameters->target().get_size() == 32) |
1c4f3631 ILT |
3082 | { |
3083 | file_header_size = elfcpp::Elf_sizes<32>::ehdr_size; | |
3084 | segment_headers_size = segment_count * elfcpp::Elf_sizes<32>::phdr_size; | |
3085 | } | |
8851ecca | 3086 | else if (parameters->target().get_size() == 64) |
1c4f3631 ILT |
3087 | { |
3088 | file_header_size = elfcpp::Elf_sizes<64>::ehdr_size; | |
3089 | segment_headers_size = segment_count * elfcpp::Elf_sizes<64>::phdr_size; | |
3090 | } | |
3091 | else | |
3092 | gold_unreachable(); | |
3093 | ||
3094 | return file_header_size + segment_headers_size; | |
3095 | } | |
3096 | ||
3097 | // Return the amount we have to subtract from the LMA to accomodate | |
3098 | // headers of the given size. The complication is that the file | |
3099 | // header have to be at the start of a page, as otherwise it will not | |
3100 | // be at the start of the file. | |
3101 | ||
3102 | uint64_t | |
3103 | Script_sections::header_size_adjustment(uint64_t lma, | |
3104 | size_t sizeof_headers) const | |
3105 | { | |
8851ecca | 3106 | const uint64_t abi_pagesize = parameters->target().abi_pagesize(); |
1c4f3631 ILT |
3107 | uint64_t hdr_lma = lma - sizeof_headers; |
3108 | hdr_lma &= ~(abi_pagesize - 1); | |
3109 | return lma - hdr_lma; | |
3110 | } | |
3111 | ||
a445fddf ILT |
3112 | // Create the PT_LOAD segments when using a SECTIONS clause. Returns |
3113 | // the segment which should hold the file header and segment headers, | |
3114 | // if any. | |
3115 | ||
3116 | Output_segment* | |
3117 | Script_sections::create_segments(Layout* layout) | |
3118 | { | |
3119 | gold_assert(this->saw_sections_clause_); | |
3120 | ||
8851ecca | 3121 | if (parameters->options().relocatable()) |
a445fddf ILT |
3122 | return NULL; |
3123 | ||
1c4f3631 ILT |
3124 | if (this->saw_phdrs_clause()) |
3125 | return create_segments_from_phdrs_clause(layout); | |
3126 | ||
a445fddf ILT |
3127 | Layout::Section_list sections; |
3128 | layout->get_allocated_sections(§ions); | |
3129 | ||
3130 | // Sort the sections by address. | |
3131 | std::stable_sort(sections.begin(), sections.end(), Sort_output_sections()); | |
3132 | ||
3133 | this->create_note_and_tls_segments(layout, §ions); | |
3134 | ||
3135 | // Walk through the sections adding them to PT_LOAD segments. | |
8851ecca | 3136 | const uint64_t abi_pagesize = parameters->target().abi_pagesize(); |
a445fddf ILT |
3137 | Output_segment* first_seg = NULL; |
3138 | Output_segment* current_seg = NULL; | |
3139 | bool is_current_seg_readonly = true; | |
3140 | Layout::Section_list::iterator plast = sections.end(); | |
3141 | uint64_t last_vma = 0; | |
3142 | uint64_t last_lma = 0; | |
3143 | uint64_t last_size = 0; | |
3144 | for (Layout::Section_list::iterator p = sections.begin(); | |
3145 | p != sections.end(); | |
3146 | ++p) | |
3147 | { | |
3148 | const uint64_t vma = (*p)->address(); | |
3149 | const uint64_t lma = ((*p)->has_load_address() | |
3150 | ? (*p)->load_address() | |
3151 | : vma); | |
3152 | const uint64_t size = (*p)->current_data_size(); | |
3153 | ||
3154 | bool need_new_segment; | |
3155 | if (current_seg == NULL) | |
3156 | need_new_segment = true; | |
3157 | else if (lma - vma != last_lma - last_vma) | |
3158 | { | |
3159 | // This section has a different LMA relationship than the | |
3160 | // last one; we need a new segment. | |
3161 | need_new_segment = true; | |
3162 | } | |
3163 | else if (align_address(last_lma + last_size, abi_pagesize) | |
3164 | < align_address(lma, abi_pagesize)) | |
3165 | { | |
3166 | // Putting this section in the segment would require | |
3167 | // skipping a page. | |
3168 | need_new_segment = true; | |
3169 | } | |
3170 | else if (is_bss_section(*plast) && !is_bss_section(*p)) | |
3171 | { | |
3172 | // A non-BSS section can not follow a BSS section in the | |
3173 | // same segment. | |
3174 | need_new_segment = true; | |
3175 | } | |
3176 | else if (is_current_seg_readonly | |
af6156ef ILT |
3177 | && ((*p)->flags() & elfcpp::SHF_WRITE) != 0 |
3178 | && !parameters->options().omagic()) | |
a445fddf ILT |
3179 | { |
3180 | // Don't put a writable section in the same segment as a | |
3181 | // non-writable section. | |
3182 | need_new_segment = true; | |
3183 | } | |
3184 | else | |
3185 | { | |
3186 | // Otherwise, reuse the existing segment. | |
3187 | need_new_segment = false; | |
3188 | } | |
3189 | ||
3190 | elfcpp::Elf_Word seg_flags = | |
3191 | Layout::section_flags_to_segment((*p)->flags()); | |
3192 | ||
3193 | if (need_new_segment) | |
3194 | { | |
3195 | current_seg = layout->make_output_segment(elfcpp::PT_LOAD, | |
3196 | seg_flags); | |
3197 | current_seg->set_addresses(vma, lma); | |
3198 | if (first_seg == NULL) | |
3199 | first_seg = current_seg; | |
3200 | is_current_seg_readonly = true; | |
3201 | } | |
3202 | ||
f5c870d2 | 3203 | current_seg->add_output_section(*p, seg_flags, false); |
a445fddf ILT |
3204 | |
3205 | if (((*p)->flags() & elfcpp::SHF_WRITE) != 0) | |
3206 | is_current_seg_readonly = false; | |
3207 | ||
3208 | plast = p; | |
3209 | last_vma = vma; | |
3210 | last_lma = lma; | |
3211 | last_size = size; | |
3212 | } | |
3213 | ||
3214 | // An ELF program should work even if the program headers are not in | |
3215 | // a PT_LOAD segment. However, it appears that the Linux kernel | |
3216 | // does not set the AT_PHDR auxiliary entry in that case. It sets | |
3217 | // the load address to p_vaddr - p_offset of the first PT_LOAD | |
3218 | // segment. It then sets AT_PHDR to the load address plus the | |
3219 | // offset to the program headers, e_phoff in the file header. This | |
3220 | // fails when the program headers appear in the file before the | |
3221 | // first PT_LOAD segment. Therefore, we always create a PT_LOAD | |
3222 | // segment to hold the file header and the program headers. This is | |
3223 | // effectively what the GNU linker does, and it is slightly more | |
3224 | // efficient in any case. We try to use the first PT_LOAD segment | |
3225 | // if we can, otherwise we make a new one. | |
3226 | ||
919ed24c ILT |
3227 | if (first_seg == NULL) |
3228 | return NULL; | |
3229 | ||
3ee173de ILT |
3230 | // -n or -N mean that the program is not demand paged and there is |
3231 | // no need to put the program headers in a PT_LOAD segment. | |
3232 | if (parameters->options().nmagic() || parameters->options().omagic()) | |
3233 | return NULL; | |
3234 | ||
1c4f3631 | 3235 | size_t sizeof_headers = this->total_header_size(layout); |
3802b2dd | 3236 | |
919ed24c ILT |
3237 | uint64_t vma = first_seg->vaddr(); |
3238 | uint64_t lma = first_seg->paddr(); | |
3239 | ||
3240 | uint64_t subtract = this->header_size_adjustment(lma, sizeof_headers); | |
3241 | ||
e6188289 ILT |
3242 | if ((lma & (abi_pagesize - 1)) >= sizeof_headers) |
3243 | { | |
3244 | first_seg->set_addresses(vma - subtract, lma - subtract); | |
3245 | return first_seg; | |
3246 | } | |
3247 | ||
919ed24c ILT |
3248 | // If there is no room to squeeze in the headers, then punt. The |
3249 | // resulting executable probably won't run on GNU/Linux, but we | |
3250 | // trust that the user knows what they are doing. | |
3251 | if (lma < subtract || vma < subtract) | |
3252 | return NULL; | |
3253 | ||
a445fddf ILT |
3254 | Output_segment* load_seg = layout->make_output_segment(elfcpp::PT_LOAD, |
3255 | elfcpp::PF_R); | |
919ed24c | 3256 | load_seg->set_addresses(vma - subtract, lma - subtract); |
a445fddf ILT |
3257 | |
3258 | return load_seg; | |
3259 | } | |
3260 | ||
3261 | // Create a PT_NOTE segment for each SHT_NOTE section and a PT_TLS | |
3262 | // segment if there are any SHT_TLS sections. | |
3263 | ||
3264 | void | |
3265 | Script_sections::create_note_and_tls_segments( | |
3266 | Layout* layout, | |
3267 | const Layout::Section_list* sections) | |
3268 | { | |
1c4f3631 ILT |
3269 | gold_assert(!this->saw_phdrs_clause()); |
3270 | ||
a445fddf ILT |
3271 | bool saw_tls = false; |
3272 | for (Layout::Section_list::const_iterator p = sections->begin(); | |
3273 | p != sections->end(); | |
3274 | ++p) | |
3275 | { | |
3276 | if ((*p)->type() == elfcpp::SHT_NOTE) | |
3277 | { | |
3278 | elfcpp::Elf_Word seg_flags = | |
3279 | Layout::section_flags_to_segment((*p)->flags()); | |
3280 | Output_segment* oseg = layout->make_output_segment(elfcpp::PT_NOTE, | |
3281 | seg_flags); | |
f5c870d2 | 3282 | oseg->add_output_section(*p, seg_flags, false); |
a445fddf ILT |
3283 | |
3284 | // Incorporate any subsequent SHT_NOTE sections, in the | |
3285 | // hopes that the script is sensible. | |
3286 | Layout::Section_list::const_iterator pnext = p + 1; | |
3287 | while (pnext != sections->end() | |
3288 | && (*pnext)->type() == elfcpp::SHT_NOTE) | |
3289 | { | |
3290 | seg_flags = Layout::section_flags_to_segment((*pnext)->flags()); | |
f5c870d2 | 3291 | oseg->add_output_section(*pnext, seg_flags, false); |
a445fddf ILT |
3292 | p = pnext; |
3293 | ++pnext; | |
3294 | } | |
3295 | } | |
3296 | ||
3297 | if (((*p)->flags() & elfcpp::SHF_TLS) != 0) | |
3298 | { | |
3299 | if (saw_tls) | |
3300 | gold_error(_("TLS sections are not adjacent")); | |
3301 | ||
3302 | elfcpp::Elf_Word seg_flags = | |
3303 | Layout::section_flags_to_segment((*p)->flags()); | |
3304 | Output_segment* oseg = layout->make_output_segment(elfcpp::PT_TLS, | |
3305 | seg_flags); | |
f5c870d2 | 3306 | oseg->add_output_section(*p, seg_flags, false); |
a445fddf ILT |
3307 | |
3308 | Layout::Section_list::const_iterator pnext = p + 1; | |
3309 | while (pnext != sections->end() | |
3310 | && ((*pnext)->flags() & elfcpp::SHF_TLS) != 0) | |
3311 | { | |
3312 | seg_flags = Layout::section_flags_to_segment((*pnext)->flags()); | |
f5c870d2 | 3313 | oseg->add_output_section(*pnext, seg_flags, false); |
a445fddf ILT |
3314 | p = pnext; |
3315 | ++pnext; | |
3316 | } | |
3317 | ||
3318 | saw_tls = true; | |
3319 | } | |
3320 | } | |
3321 | } | |
3322 | ||
1c4f3631 ILT |
3323 | // Add a program header. The PHDRS clause is syntactically distinct |
3324 | // from the SECTIONS clause, but we implement it with the SECTIONS | |
55458500 | 3325 | // support because PHDRS is useless if there is no SECTIONS clause. |
1c4f3631 ILT |
3326 | |
3327 | void | |
3328 | Script_sections::add_phdr(const char* name, size_t namelen, unsigned int type, | |
3329 | bool includes_filehdr, bool includes_phdrs, | |
3330 | bool is_flags_valid, unsigned int flags, | |
3331 | Expression* load_address) | |
3332 | { | |
3333 | if (this->phdrs_elements_ == NULL) | |
3334 | this->phdrs_elements_ = new Phdrs_elements(); | |
3335 | this->phdrs_elements_->push_back(new Phdrs_element(name, namelen, type, | |
3336 | includes_filehdr, | |
3337 | includes_phdrs, | |
3338 | is_flags_valid, flags, | |
3339 | load_address)); | |
3340 | } | |
3341 | ||
3802b2dd ILT |
3342 | // Return the number of segments we expect to create based on the |
3343 | // SECTIONS clause. This is used to implement SIZEOF_HEADERS. | |
3344 | ||
3345 | size_t | |
3346 | Script_sections::expected_segment_count(const Layout* layout) const | |
3347 | { | |
1c4f3631 ILT |
3348 | if (this->saw_phdrs_clause()) |
3349 | return this->phdrs_elements_->size(); | |
3350 | ||
3802b2dd ILT |
3351 | Layout::Section_list sections; |
3352 | layout->get_allocated_sections(§ions); | |
3353 | ||
3354 | // We assume that we will need two PT_LOAD segments. | |
3355 | size_t ret = 2; | |
3356 | ||
3357 | bool saw_note = false; | |
3358 | bool saw_tls = false; | |
3359 | for (Layout::Section_list::const_iterator p = sections.begin(); | |
3360 | p != sections.end(); | |
3361 | ++p) | |
3362 | { | |
3363 | if ((*p)->type() == elfcpp::SHT_NOTE) | |
3364 | { | |
3365 | // Assume that all note sections will fit into a single | |
3366 | // PT_NOTE segment. | |
3367 | if (!saw_note) | |
3368 | { | |
3369 | ++ret; | |
3370 | saw_note = true; | |
3371 | } | |
3372 | } | |
3373 | else if (((*p)->flags() & elfcpp::SHF_TLS) != 0) | |
3374 | { | |
3375 | // There can only be one PT_TLS segment. | |
3376 | if (!saw_tls) | |
3377 | { | |
3378 | ++ret; | |
3379 | saw_tls = true; | |
3380 | } | |
3381 | } | |
3382 | } | |
3383 | ||
3384 | return ret; | |
3385 | } | |
3386 | ||
1c4f3631 ILT |
3387 | // Create the segments from a PHDRS clause. Return the segment which |
3388 | // should hold the file header and program headers, if any. | |
3389 | ||
3390 | Output_segment* | |
3391 | Script_sections::create_segments_from_phdrs_clause(Layout* layout) | |
3392 | { | |
3393 | this->attach_sections_using_phdrs_clause(layout); | |
3394 | return this->set_phdrs_clause_addresses(layout); | |
3395 | } | |
3396 | ||
3397 | // Create the segments from the PHDRS clause, and put the output | |
3398 | // sections in them. | |
3399 | ||
3400 | void | |
3401 | Script_sections::attach_sections_using_phdrs_clause(Layout* layout) | |
3402 | { | |
3403 | typedef std::map<std::string, Output_segment*> Name_to_segment; | |
3404 | Name_to_segment name_to_segment; | |
3405 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); | |
3406 | p != this->phdrs_elements_->end(); | |
3407 | ++p) | |
3408 | name_to_segment[(*p)->name()] = (*p)->create_segment(layout); | |
3409 | ||
3410 | // Walk through the output sections and attach them to segments. | |
3411 | // Output sections in the script which do not list segments are | |
3412 | // attached to the same set of segments as the immediately preceding | |
3413 | // output section. | |
20e6d0d6 | 3414 | |
1c4f3631 | 3415 | String_list* phdr_names = NULL; |
20e6d0d6 | 3416 | bool load_segments_only = false; |
1c4f3631 ILT |
3417 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); |
3418 | p != this->sections_elements_->end(); | |
3419 | ++p) | |
3420 | { | |
2cefc357 | 3421 | bool orphan; |
20e6d0d6 | 3422 | String_list* old_phdr_names = phdr_names; |
2cefc357 | 3423 | Output_section* os = (*p)->allocate_to_segment(&phdr_names, &orphan); |
1c4f3631 ILT |
3424 | if (os == NULL) |
3425 | continue; | |
3426 | ||
3427 | if (phdr_names == NULL) | |
3428 | { | |
3429 | gold_error(_("allocated section not in any segment")); | |
3430 | continue; | |
3431 | } | |
3432 | ||
20e6d0d6 DK |
3433 | // We see a list of segments names. Disable PT_LOAD segment only |
3434 | // filtering. | |
3435 | if (old_phdr_names != phdr_names) | |
3436 | load_segments_only = false; | |
3437 | ||
2cefc357 ILT |
3438 | // If this is an orphan section--one that was not explicitly |
3439 | // mentioned in the linker script--then it should not inherit | |
3440 | // any segment type other than PT_LOAD. Otherwise, e.g., the | |
3441 | // PT_INTERP segment will pick up following orphan sections, | |
3442 | // which does not make sense. If this is not an orphan section, | |
3443 | // we trust the linker script. | |
3444 | if (orphan) | |
3445 | { | |
20e6d0d6 DK |
3446 | // Enable PT_LOAD segments only filtering until we see another |
3447 | // list of segment names. | |
3448 | load_segments_only = true; | |
2cefc357 ILT |
3449 | } |
3450 | ||
1c4f3631 ILT |
3451 | bool in_load_segment = false; |
3452 | for (String_list::const_iterator q = phdr_names->begin(); | |
3453 | q != phdr_names->end(); | |
3454 | ++q) | |
3455 | { | |
3456 | Name_to_segment::const_iterator r = name_to_segment.find(*q); | |
3457 | if (r == name_to_segment.end()) | |
3458 | gold_error(_("no segment %s"), q->c_str()); | |
3459 | else | |
3460 | { | |
20e6d0d6 DK |
3461 | if (load_segments_only |
3462 | && r->second->type() != elfcpp::PT_LOAD) | |
3463 | continue; | |
3464 | ||
1c4f3631 ILT |
3465 | elfcpp::Elf_Word seg_flags = |
3466 | Layout::section_flags_to_segment(os->flags()); | |
f5c870d2 | 3467 | r->second->add_output_section(os, seg_flags, false); |
1c4f3631 ILT |
3468 | |
3469 | if (r->second->type() == elfcpp::PT_LOAD) | |
3470 | { | |
3471 | if (in_load_segment) | |
3472 | gold_error(_("section in two PT_LOAD segments")); | |
3473 | in_load_segment = true; | |
3474 | } | |
3475 | } | |
3476 | } | |
3477 | ||
3478 | if (!in_load_segment) | |
3479 | gold_error(_("allocated section not in any PT_LOAD segment")); | |
3480 | } | |
3481 | } | |
3482 | ||
3483 | // Set the addresses for segments created from a PHDRS clause. Return | |
3484 | // the segment which should hold the file header and program headers, | |
3485 | // if any. | |
3486 | ||
3487 | Output_segment* | |
3488 | Script_sections::set_phdrs_clause_addresses(Layout* layout) | |
3489 | { | |
3490 | Output_segment* load_seg = NULL; | |
3491 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); | |
3492 | p != this->phdrs_elements_->end(); | |
3493 | ++p) | |
3494 | { | |
3495 | // Note that we have to set the flags after adding the output | |
3496 | // sections to the segment, as adding an output segment can | |
3497 | // change the flags. | |
3498 | (*p)->set_flags_if_valid(); | |
3499 | ||
3500 | Output_segment* oseg = (*p)->segment(); | |
3501 | ||
3502 | if (oseg->type() != elfcpp::PT_LOAD) | |
3503 | { | |
3504 | // The addresses of non-PT_LOAD segments are set from the | |
3505 | // PT_LOAD segments. | |
3506 | if ((*p)->has_load_address()) | |
3507 | gold_error(_("may only specify load address for PT_LOAD segment")); | |
3508 | continue; | |
3509 | } | |
3510 | ||
3511 | // The output sections should have addresses from the SECTIONS | |
3512 | // clause. The addresses don't have to be in order, so find the | |
3513 | // one with the lowest load address. Use that to set the | |
3514 | // address of the segment. | |
3515 | ||
3516 | Output_section* osec = oseg->section_with_lowest_load_address(); | |
3517 | if (osec == NULL) | |
3518 | { | |
3519 | oseg->set_addresses(0, 0); | |
3520 | continue; | |
3521 | } | |
3522 | ||
3523 | uint64_t vma = osec->address(); | |
3524 | uint64_t lma = osec->has_load_address() ? osec->load_address() : vma; | |
3525 | ||
3526 | // Override the load address of the section with the load | |
3527 | // address specified for the segment. | |
3528 | if ((*p)->has_load_address()) | |
3529 | { | |
3530 | if (osec->has_load_address()) | |
3531 | gold_warning(_("PHDRS load address overrides " | |
3532 | "section %s load address"), | |
3533 | osec->name()); | |
3534 | ||
3535 | lma = (*p)->load_address(); | |
3536 | } | |
3537 | ||
3538 | bool headers = (*p)->includes_filehdr() && (*p)->includes_phdrs(); | |
3539 | if (!headers && ((*p)->includes_filehdr() || (*p)->includes_phdrs())) | |
3540 | { | |
3541 | // We could support this if we wanted to. | |
3542 | gold_error(_("using only one of FILEHDR and PHDRS is " | |
3543 | "not currently supported")); | |
3544 | } | |
3545 | if (headers) | |
3546 | { | |
3547 | size_t sizeof_headers = this->total_header_size(layout); | |
3548 | uint64_t subtract = this->header_size_adjustment(lma, | |
3549 | sizeof_headers); | |
3550 | if (lma >= subtract && vma >= subtract) | |
3551 | { | |
3552 | lma -= subtract; | |
3553 | vma -= subtract; | |
3554 | } | |
3555 | else | |
3556 | { | |
3557 | gold_error(_("sections loaded on first page without room " | |
3558 | "for file and program headers " | |
3559 | "are not supported")); | |
3560 | } | |
3561 | ||
3562 | if (load_seg != NULL) | |
3563 | gold_error(_("using FILEHDR and PHDRS on more than one " | |
3564 | "PT_LOAD segment is not currently supported")); | |
3565 | load_seg = oseg; | |
3566 | } | |
3567 | ||
3568 | oseg->set_addresses(vma, lma); | |
3569 | } | |
3570 | ||
3571 | return load_seg; | |
3572 | } | |
3573 | ||
3574 | // Add the file header and segment headers to non-load segments | |
3575 | // specified in the PHDRS clause. | |
3576 | ||
3577 | void | |
3578 | Script_sections::put_headers_in_phdrs(Output_data* file_header, | |
3579 | Output_data* segment_headers) | |
3580 | { | |
3581 | gold_assert(this->saw_phdrs_clause()); | |
3582 | for (Phdrs_elements::iterator p = this->phdrs_elements_->begin(); | |
3583 | p != this->phdrs_elements_->end(); | |
3584 | ++p) | |
3585 | { | |
3586 | if ((*p)->type() != elfcpp::PT_LOAD) | |
3587 | { | |
3588 | if ((*p)->includes_phdrs()) | |
3589 | (*p)->segment()->add_initial_output_data(segment_headers); | |
3590 | if ((*p)->includes_filehdr()) | |
3591 | (*p)->segment()->add_initial_output_data(file_header); | |
3592 | } | |
3593 | } | |
3594 | } | |
3595 | ||
8f2eb564 ILT |
3596 | // Look for an output section by name and return the address, the load |
3597 | // address, the alignment, and the size. This is used when an | |
3598 | // expression refers to an output section which was not actually | |
3599 | // created. This returns true if the section was found, false | |
3600 | // otherwise. | |
3601 | ||
3602 | bool | |
3603 | Script_sections::get_output_section_info(const char* name, uint64_t* address, | |
3604 | uint64_t* load_address, | |
2ea97941 | 3605 | uint64_t* addralign, |
8f2eb564 ILT |
3606 | uint64_t* size) const |
3607 | { | |
3608 | if (!this->saw_sections_clause_) | |
3609 | return false; | |
3610 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
3611 | p != this->sections_elements_->end(); | |
3612 | ++p) | |
2ea97941 | 3613 | if ((*p)->get_output_section_info(name, address, load_address, addralign, |
8f2eb564 ILT |
3614 | size)) |
3615 | return true; | |
3616 | return false; | |
3617 | } | |
3618 | ||
20e6d0d6 DK |
3619 | // Release all Output_segments. This remove all pointers to all |
3620 | // Output_segments. | |
3621 | ||
3622 | void | |
3623 | Script_sections::release_segments() | |
3624 | { | |
3625 | if (this->saw_phdrs_clause()) | |
3626 | { | |
3627 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); | |
3628 | p != this->phdrs_elements_->end(); | |
3629 | ++p) | |
3630 | (*p)->release_segment(); | |
3631 | } | |
3632 | } | |
3633 | ||
494e05f4 ILT |
3634 | // Print the SECTIONS clause to F for debugging. |
3635 | ||
3636 | void | |
3637 | Script_sections::print(FILE* f) const | |
3638 | { | |
3639 | if (!this->saw_sections_clause_) | |
3640 | return; | |
3641 | ||
3642 | fprintf(f, "SECTIONS {\n"); | |
3643 | ||
3644 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
3645 | p != this->sections_elements_->end(); | |
3646 | ++p) | |
3647 | (*p)->print(f); | |
3648 | ||
3649 | fprintf(f, "}\n"); | |
7d26c6cc ILT |
3650 | |
3651 | if (this->phdrs_elements_ != NULL) | |
3652 | { | |
3653 | fprintf(f, "PHDRS {\n"); | |
3654 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); | |
3655 | p != this->phdrs_elements_->end(); | |
3656 | ++p) | |
3657 | (*p)->print(f); | |
3658 | fprintf(f, "}\n"); | |
3659 | } | |
494e05f4 ILT |
3660 | } |
3661 | ||
3662 | } // End namespace gold. |