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