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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 | ||
2d924fd9 ILT |
57 | // Record that an output section is relro. |
58 | virtual void | |
59 | set_is_relro() | |
60 | { } | |
61 | ||
919ed24c ILT |
62 | // Create any required output sections. The only real |
63 | // implementation is in Output_section_definition. | |
64 | virtual void | |
65 | create_sections(Layout*) | |
66 | { } | |
67 | ||
a445fddf ILT |
68 | // Add any symbol being defined to the symbol table. |
69 | virtual void | |
70 | add_symbols_to_table(Symbol_table*) | |
71 | { } | |
72 | ||
73 | // Finalize symbols and check assertions. | |
74 | virtual void | |
77e65537 | 75 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*) |
a445fddf ILT |
76 | { } |
77 | ||
78 | // Return the output section name to use for an input file name and | |
79 | // section name. This only real implementation is in | |
80 | // Output_section_definition. | |
81 | virtual const char* | |
82 | output_section_name(const char*, const char*, Output_section***) | |
83 | { return NULL; } | |
84 | ||
85 | // Return whether to place an orphan output section after this | |
86 | // element. | |
87 | virtual bool | |
2d924fd9 | 88 | place_orphan_here(const Output_section *, bool*, bool*) const |
a445fddf ILT |
89 | { return false; } |
90 | ||
91 | // Set section addresses. This includes applying assignments if the | |
92 | // the expression is an absolute value. | |
93 | virtual void | |
fd247bfe | 94 | set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*) |
a445fddf ILT |
95 | { } |
96 | ||
3802b2dd ILT |
97 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
98 | // this section is constrained, and the input sections do not match, | |
99 | // return the constraint, and set *POSD. | |
100 | virtual Section_constraint | |
101 | check_constraint(Output_section_definition**) | |
102 | { return CONSTRAINT_NONE; } | |
103 | ||
104 | // See if this is the alternate output section for a constrained | |
105 | // output section. If it is, transfer the Output_section and return | |
106 | // true. Otherwise return false. | |
107 | virtual bool | |
108 | alternate_constraint(Output_section_definition*, Section_constraint) | |
109 | { return false; } | |
110 | ||
1c4f3631 ILT |
111 | // Get the list of segments to use for an allocated section when |
112 | // using a PHDRS clause. If this is an allocated section, return | |
2cefc357 ILT |
113 | // the Output_section, and set *PHDRS_LIST (the first parameter) to |
114 | // the list of PHDRS to which it should be attached. If the PHDRS | |
115 | // were not specified, don't change *PHDRS_LIST. When not returning | |
116 | // NULL, set *ORPHAN (the second parameter) according to whether | |
117 | // this is an orphan section--one that is not mentioned in the | |
118 | // linker script. | |
1c4f3631 | 119 | virtual Output_section* |
2cefc357 | 120 | allocate_to_segment(String_list**, bool*) |
1c4f3631 ILT |
121 | { return NULL; } |
122 | ||
8f2eb564 ILT |
123 | // Look for an output section by name and return the address, the |
124 | // load address, the alignment, and the size. This is used when an | |
125 | // expression refers to an output section which was not actually | |
126 | // created. This returns true if the section was found, false | |
127 | // otherwise. The only real definition is for | |
128 | // Output_section_definition. | |
129 | virtual bool | |
130 | get_output_section_info(const char*, uint64_t*, uint64_t*, uint64_t*, | |
131 | uint64_t*) const | |
132 | { return false; } | |
133 | ||
2d924fd9 ILT |
134 | // Return the associated Output_section if there is one. |
135 | virtual Output_section* | |
136 | get_output_section() const | |
137 | { return NULL; } | |
138 | ||
a445fddf | 139 | // Print the element for debugging purposes. |
494e05f4 ILT |
140 | virtual void |
141 | print(FILE* f) const = 0; | |
142 | }; | |
143 | ||
144 | // An assignment in a SECTIONS clause outside of an output section. | |
145 | ||
146 | class Sections_element_assignment : public Sections_element | |
147 | { | |
148 | public: | |
149 | Sections_element_assignment(const char* name, size_t namelen, | |
150 | Expression* val, bool provide, bool hidden) | |
151 | : assignment_(name, namelen, val, provide, hidden) | |
152 | { } | |
153 | ||
a445fddf ILT |
154 | // Add the symbol to the symbol table. |
155 | void | |
156 | add_symbols_to_table(Symbol_table* symtab) | |
157 | { this->assignment_.add_to_table(symtab); } | |
158 | ||
159 | // Finalize the symbol. | |
160 | void | |
161 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 162 | uint64_t* dot_value) |
a445fddf | 163 | { |
77e65537 | 164 | this->assignment_.finalize_with_dot(symtab, layout, *dot_value, NULL); |
a445fddf ILT |
165 | } |
166 | ||
167 | // Set the section address. There is no section here, but if the | |
168 | // value is absolute, we set the symbol. This permits us to use | |
169 | // absolute symbols when setting dot. | |
170 | void | |
171 | set_section_addresses(Symbol_table* symtab, Layout* layout, | |
fd247bfe | 172 | uint64_t* dot_value, uint64_t*) |
a445fddf | 173 | { |
77e65537 | 174 | this->assignment_.set_if_absolute(symtab, layout, true, *dot_value); |
a445fddf ILT |
175 | } |
176 | ||
177 | // Print for debugging. | |
494e05f4 ILT |
178 | void |
179 | print(FILE* f) const | |
180 | { | |
181 | fprintf(f, " "); | |
182 | this->assignment_.print(f); | |
183 | } | |
184 | ||
185 | private: | |
186 | Symbol_assignment assignment_; | |
187 | }; | |
188 | ||
a445fddf ILT |
189 | // An assignment to the dot symbol in a SECTIONS clause outside of an |
190 | // output section. | |
191 | ||
192 | class Sections_element_dot_assignment : public Sections_element | |
193 | { | |
194 | public: | |
195 | Sections_element_dot_assignment(Expression* val) | |
196 | : val_(val) | |
197 | { } | |
198 | ||
199 | // Finalize the symbol. | |
200 | void | |
201 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 202 | uint64_t* dot_value) |
a445fddf | 203 | { |
77e65537 ILT |
204 | // We ignore the section of the result because outside of an |
205 | // output section definition the dot symbol is always considered | |
206 | // to be absolute. | |
207 | Output_section* dummy; | |
919ed24c | 208 | *dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 | 209 | NULL, &dummy); |
a445fddf ILT |
210 | } |
211 | ||
212 | // Update the dot symbol while setting section addresses. | |
213 | void | |
214 | set_section_addresses(Symbol_table* symtab, Layout* layout, | |
fd247bfe | 215 | uint64_t* dot_value, uint64_t* load_address) |
a445fddf | 216 | { |
77e65537 | 217 | Output_section* dummy; |
919ed24c | 218 | *dot_value = this->val_->eval_with_dot(symtab, layout, false, *dot_value, |
77e65537 | 219 | NULL, &dummy); |
fd247bfe | 220 | *load_address = *dot_value; |
a445fddf ILT |
221 | } |
222 | ||
223 | // Print for debugging. | |
224 | void | |
225 | print(FILE* f) const | |
226 | { | |
227 | fprintf(f, " . = "); | |
228 | this->val_->print(f); | |
229 | fprintf(f, "\n"); | |
230 | } | |
231 | ||
232 | private: | |
233 | Expression* val_; | |
234 | }; | |
235 | ||
494e05f4 ILT |
236 | // An assertion in a SECTIONS clause outside of an output section. |
237 | ||
238 | class Sections_element_assertion : public Sections_element | |
239 | { | |
240 | public: | |
241 | Sections_element_assertion(Expression* check, const char* message, | |
242 | size_t messagelen) | |
243 | : assertion_(check, message, messagelen) | |
244 | { } | |
245 | ||
a445fddf ILT |
246 | // Check the assertion. |
247 | void | |
77e65537 | 248 | finalize_symbols(Symbol_table* symtab, const Layout* layout, uint64_t*) |
a445fddf ILT |
249 | { this->assertion_.check(symtab, layout); } |
250 | ||
251 | // Print for debugging. | |
494e05f4 ILT |
252 | void |
253 | print(FILE* f) const | |
254 | { | |
255 | fprintf(f, " "); | |
256 | this->assertion_.print(f); | |
257 | } | |
258 | ||
259 | private: | |
260 | Script_assertion assertion_; | |
261 | }; | |
262 | ||
263 | // An element in an output section in a SECTIONS clause. | |
264 | ||
265 | class Output_section_element | |
266 | { | |
267 | public: | |
a445fddf ILT |
268 | // A list of input sections. |
269 | typedef std::list<std::pair<Relobj*, unsigned int> > Input_section_list; | |
270 | ||
494e05f4 ILT |
271 | Output_section_element() |
272 | { } | |
273 | ||
274 | virtual ~Output_section_element() | |
275 | { } | |
276 | ||
919ed24c ILT |
277 | // Return whether this element requires an output section to exist. |
278 | virtual bool | |
279 | needs_output_section() const | |
280 | { return false; } | |
281 | ||
a445fddf ILT |
282 | // Add any symbol being defined to the symbol table. |
283 | virtual void | |
284 | add_symbols_to_table(Symbol_table*) | |
285 | { } | |
286 | ||
287 | // Finalize symbols and check assertions. | |
288 | virtual void | |
77e65537 | 289 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*, Output_section**) |
a445fddf ILT |
290 | { } |
291 | ||
292 | // Return whether this element matches FILE_NAME and SECTION_NAME. | |
293 | // The only real implementation is in Output_section_element_input. | |
294 | virtual bool | |
295 | match_name(const char*, const char*) const | |
296 | { return false; } | |
297 | ||
298 | // Set section addresses. This includes applying assignments if the | |
299 | // the expression is an absolute value. | |
300 | virtual void | |
301 | set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t, | |
77e65537 ILT |
302 | uint64_t*, Output_section**, std::string*, |
303 | Input_section_list*) | |
a445fddf ILT |
304 | { } |
305 | ||
306 | // Print the element for debugging purposes. | |
494e05f4 ILT |
307 | virtual void |
308 | print(FILE* f) const = 0; | |
a445fddf ILT |
309 | |
310 | protected: | |
311 | // Return a fill string that is LENGTH bytes long, filling it with | |
312 | // FILL. | |
313 | std::string | |
314 | get_fill_string(const std::string* fill, section_size_type length) const; | |
494e05f4 ILT |
315 | }; |
316 | ||
a445fddf ILT |
317 | std::string |
318 | Output_section_element::get_fill_string(const std::string* fill, | |
319 | section_size_type length) const | |
320 | { | |
321 | std::string this_fill; | |
322 | this_fill.reserve(length); | |
323 | while (this_fill.length() + fill->length() <= length) | |
324 | this_fill += *fill; | |
325 | if (this_fill.length() < length) | |
326 | this_fill.append(*fill, 0, length - this_fill.length()); | |
327 | return this_fill; | |
328 | } | |
329 | ||
494e05f4 ILT |
330 | // A symbol assignment in an output section. |
331 | ||
332 | class Output_section_element_assignment : public Output_section_element | |
333 | { | |
334 | public: | |
335 | Output_section_element_assignment(const char* name, size_t namelen, | |
336 | Expression* val, bool provide, | |
337 | bool hidden) | |
338 | : assignment_(name, namelen, val, provide, hidden) | |
339 | { } | |
340 | ||
a445fddf ILT |
341 | // Add the symbol to the symbol table. |
342 | void | |
343 | add_symbols_to_table(Symbol_table* symtab) | |
344 | { this->assignment_.add_to_table(symtab); } | |
345 | ||
346 | // Finalize the symbol. | |
347 | void | |
348 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 349 | uint64_t* dot_value, Output_section** dot_section) |
a445fddf | 350 | { |
77e65537 ILT |
351 | this->assignment_.finalize_with_dot(symtab, layout, *dot_value, |
352 | *dot_section); | |
a445fddf ILT |
353 | } |
354 | ||
355 | // Set the section address. There is no section here, but if the | |
356 | // value is absolute, we set the symbol. This permits us to use | |
357 | // absolute symbols when setting dot. | |
358 | void | |
359 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
77e65537 ILT |
360 | uint64_t, uint64_t* dot_value, Output_section**, |
361 | std::string*, Input_section_list*) | |
a445fddf | 362 | { |
77e65537 | 363 | this->assignment_.set_if_absolute(symtab, layout, true, *dot_value); |
a445fddf ILT |
364 | } |
365 | ||
366 | // Print for debugging. | |
494e05f4 ILT |
367 | void |
368 | print(FILE* f) const | |
369 | { | |
370 | fprintf(f, " "); | |
371 | this->assignment_.print(f); | |
372 | } | |
373 | ||
374 | private: | |
375 | Symbol_assignment assignment_; | |
376 | }; | |
377 | ||
a445fddf ILT |
378 | // An assignment to the dot symbol in an output section. |
379 | ||
380 | class Output_section_element_dot_assignment : public Output_section_element | |
381 | { | |
382 | public: | |
383 | Output_section_element_dot_assignment(Expression* val) | |
384 | : val_(val) | |
385 | { } | |
386 | ||
387 | // Finalize the symbol. | |
388 | void | |
389 | finalize_symbols(Symbol_table* symtab, const Layout* layout, | |
77e65537 | 390 | uint64_t* dot_value, Output_section** dot_section) |
a445fddf | 391 | { |
919ed24c | 392 | *dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 | 393 | *dot_section, dot_section); |
a445fddf ILT |
394 | } |
395 | ||
396 | // Update the dot symbol while setting section addresses. | |
397 | void | |
398 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
77e65537 ILT |
399 | uint64_t, uint64_t* dot_value, Output_section**, |
400 | std::string*, Input_section_list*); | |
a445fddf ILT |
401 | |
402 | // Print for debugging. | |
403 | void | |
404 | print(FILE* f) const | |
405 | { | |
406 | fprintf(f, " . = "); | |
407 | this->val_->print(f); | |
408 | fprintf(f, "\n"); | |
409 | } | |
410 | ||
411 | private: | |
412 | Expression* val_; | |
413 | }; | |
414 | ||
415 | // Update the dot symbol while setting section addresses. | |
416 | ||
417 | void | |
418 | Output_section_element_dot_assignment::set_section_addresses( | |
419 | Symbol_table* symtab, | |
420 | Layout* layout, | |
421 | Output_section* output_section, | |
422 | uint64_t, | |
423 | uint64_t* dot_value, | |
77e65537 | 424 | Output_section** dot_section, |
a445fddf ILT |
425 | std::string* fill, |
426 | Input_section_list*) | |
427 | { | |
919ed24c ILT |
428 | uint64_t next_dot = this->val_->eval_with_dot(symtab, layout, false, |
429 | *dot_value, *dot_section, | |
430 | dot_section); | |
a445fddf ILT |
431 | if (next_dot < *dot_value) |
432 | gold_error(_("dot may not move backward")); | |
433 | if (next_dot > *dot_value && output_section != NULL) | |
434 | { | |
435 | section_size_type length = convert_to_section_size_type(next_dot | |
436 | - *dot_value); | |
437 | Output_section_data* posd; | |
438 | if (fill->empty()) | |
7d9e3d98 | 439 | posd = new Output_data_zero_fill(length, 0); |
a445fddf ILT |
440 | else |
441 | { | |
442 | std::string this_fill = this->get_fill_string(fill, length); | |
443 | posd = new Output_data_const(this_fill, 0); | |
444 | } | |
445 | output_section->add_output_section_data(posd); | |
446 | } | |
447 | *dot_value = next_dot; | |
448 | } | |
449 | ||
494e05f4 ILT |
450 | // An assertion in an output section. |
451 | ||
452 | class Output_section_element_assertion : public Output_section_element | |
453 | { | |
454 | public: | |
455 | Output_section_element_assertion(Expression* check, const char* message, | |
456 | size_t messagelen) | |
457 | : assertion_(check, message, messagelen) | |
458 | { } | |
459 | ||
460 | void | |
461 | print(FILE* f) const | |
462 | { | |
463 | fprintf(f, " "); | |
464 | this->assertion_.print(f); | |
465 | } | |
466 | ||
467 | private: | |
468 | Script_assertion assertion_; | |
469 | }; | |
470 | ||
77e65537 ILT |
471 | // We use a special instance of Output_section_data to handle BYTE, |
472 | // SHORT, etc. This permits forward references to symbols in the | |
473 | // expressions. | |
494e05f4 | 474 | |
77e65537 | 475 | class Output_data_expression : public Output_section_data |
494e05f4 ILT |
476 | { |
477 | public: | |
77e65537 ILT |
478 | Output_data_expression(int size, bool is_signed, Expression* val, |
479 | const Symbol_table* symtab, const Layout* layout, | |
480 | uint64_t dot_value, Output_section* dot_section) | |
481 | : Output_section_data(size, 0), | |
482 | is_signed_(is_signed), val_(val), symtab_(symtab), | |
483 | layout_(layout), dot_value_(dot_value), dot_section_(dot_section) | |
494e05f4 ILT |
484 | { } |
485 | ||
77e65537 ILT |
486 | protected: |
487 | // Write the data to the output file. | |
a445fddf | 488 | void |
77e65537 | 489 | do_write(Output_file*); |
a445fddf | 490 | |
77e65537 | 491 | // Write the data to a buffer. |
494e05f4 | 492 | void |
77e65537 | 493 | do_write_to_buffer(unsigned char*); |
494e05f4 | 494 | |
7d9e3d98 ILT |
495 | // Write to a map file. |
496 | void | |
497 | do_print_to_mapfile(Mapfile* mapfile) const | |
498 | { mapfile->print_output_data(this, _("** expression")); } | |
499 | ||
494e05f4 | 500 | private: |
a445fddf | 501 | template<bool big_endian> |
77e65537 ILT |
502 | void |
503 | endian_write_to_buffer(uint64_t, unsigned char*); | |
a445fddf | 504 | |
494e05f4 | 505 | bool is_signed_; |
494e05f4 | 506 | Expression* val_; |
77e65537 ILT |
507 | const Symbol_table* symtab_; |
508 | const Layout* layout_; | |
509 | uint64_t dot_value_; | |
510 | Output_section* dot_section_; | |
494e05f4 ILT |
511 | }; |
512 | ||
77e65537 | 513 | // Write the data element to the output file. |
a445fddf ILT |
514 | |
515 | void | |
77e65537 | 516 | Output_data_expression::do_write(Output_file* of) |
a445fddf | 517 | { |
77e65537 ILT |
518 | unsigned char* view = of->get_output_view(this->offset(), this->data_size()); |
519 | this->write_to_buffer(view); | |
520 | of->write_output_view(this->offset(), this->data_size(), view); | |
521 | } | |
a445fddf | 522 | |
77e65537 ILT |
523 | // Write the data element to a buffer. |
524 | ||
525 | void | |
526 | Output_data_expression::do_write_to_buffer(unsigned char* buf) | |
527 | { | |
528 | Output_section* dummy; | |
529 | uint64_t val = this->val_->eval_with_dot(this->symtab_, this->layout_, | |
919ed24c | 530 | true, this->dot_value_, |
77e65537 | 531 | this->dot_section_, &dummy); |
a445fddf | 532 | |
8851ecca | 533 | if (parameters->target().is_big_endian()) |
77e65537 | 534 | this->endian_write_to_buffer<true>(val, buf); |
a445fddf | 535 | else |
77e65537 | 536 | this->endian_write_to_buffer<false>(val, buf); |
a445fddf ILT |
537 | } |
538 | ||
a445fddf | 539 | template<bool big_endian> |
77e65537 ILT |
540 | void |
541 | Output_data_expression::endian_write_to_buffer(uint64_t val, | |
542 | unsigned char* buf) | |
a445fddf | 543 | { |
77e65537 | 544 | switch (this->data_size()) |
a445fddf ILT |
545 | { |
546 | case 1: | |
547 | elfcpp::Swap_unaligned<8, big_endian>::writeval(buf, val); | |
a445fddf ILT |
548 | break; |
549 | case 2: | |
550 | elfcpp::Swap_unaligned<16, big_endian>::writeval(buf, val); | |
a445fddf ILT |
551 | break; |
552 | case 4: | |
553 | elfcpp::Swap_unaligned<32, big_endian>::writeval(buf, val); | |
a445fddf ILT |
554 | break; |
555 | case 8: | |
8851ecca | 556 | if (parameters->target().get_size() == 32) |
a445fddf ILT |
557 | { |
558 | val &= 0xffffffff; | |
559 | if (this->is_signed_ && (val & 0x80000000) != 0) | |
560 | val |= 0xffffffff00000000LL; | |
561 | } | |
562 | elfcpp::Swap_unaligned<64, big_endian>::writeval(buf, val); | |
a445fddf ILT |
563 | break; |
564 | default: | |
565 | gold_unreachable(); | |
566 | } | |
77e65537 ILT |
567 | } |
568 | ||
569 | // A data item in an output section. | |
570 | ||
571 | class Output_section_element_data : public Output_section_element | |
572 | { | |
573 | public: | |
574 | Output_section_element_data(int size, bool is_signed, Expression* val) | |
575 | : size_(size), is_signed_(is_signed), val_(val) | |
576 | { } | |
577 | ||
919ed24c ILT |
578 | // If there is a data item, then we must create an output section. |
579 | bool | |
580 | needs_output_section() const | |
581 | { return true; } | |
582 | ||
77e65537 ILT |
583 | // Finalize symbols--we just need to update dot. |
584 | void | |
585 | finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value, | |
586 | Output_section**) | |
587 | { *dot_value += this->size_; } | |
588 | ||
589 | // Store the value in the section. | |
590 | void | |
591 | set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t, | |
592 | uint64_t* dot_value, Output_section**, std::string*, | |
593 | Input_section_list*); | |
594 | ||
595 | // Print for debugging. | |
596 | void | |
597 | print(FILE*) const; | |
598 | ||
599 | private: | |
600 | // The size in bytes. | |
601 | int size_; | |
602 | // Whether the value is signed. | |
603 | bool is_signed_; | |
604 | // The value. | |
605 | Expression* val_; | |
606 | }; | |
607 | ||
608 | // Store the value in the section. | |
609 | ||
610 | void | |
611 | Output_section_element_data::set_section_addresses( | |
612 | Symbol_table* symtab, | |
613 | Layout* layout, | |
614 | Output_section* os, | |
615 | uint64_t, | |
616 | uint64_t* dot_value, | |
617 | Output_section** dot_section, | |
618 | std::string*, | |
619 | Input_section_list*) | |
620 | { | |
621 | gold_assert(os != NULL); | |
622 | os->add_output_section_data(new Output_data_expression(this->size_, | |
623 | this->is_signed_, | |
624 | this->val_, | |
625 | symtab, | |
626 | layout, | |
627 | *dot_value, | |
628 | *dot_section)); | |
629 | *dot_value += this->size_; | |
a445fddf ILT |
630 | } |
631 | ||
494e05f4 ILT |
632 | // Print for debugging. |
633 | ||
634 | void | |
635 | Output_section_element_data::print(FILE* f) const | |
636 | { | |
637 | const char* s; | |
638 | switch (this->size_) | |
639 | { | |
640 | case 1: | |
641 | s = "BYTE"; | |
642 | break; | |
643 | case 2: | |
644 | s = "SHORT"; | |
645 | break; | |
646 | case 4: | |
647 | s = "LONG"; | |
648 | break; | |
649 | case 8: | |
650 | if (this->is_signed_) | |
651 | s = "SQUAD"; | |
652 | else | |
653 | s = "QUAD"; | |
654 | break; | |
655 | default: | |
656 | gold_unreachable(); | |
657 | } | |
658 | fprintf(f, " %s(", s); | |
659 | this->val_->print(f); | |
660 | fprintf(f, ")\n"); | |
661 | } | |
662 | ||
663 | // A fill value setting in an output section. | |
664 | ||
665 | class Output_section_element_fill : public Output_section_element | |
666 | { | |
667 | public: | |
668 | Output_section_element_fill(Expression* val) | |
669 | : val_(val) | |
670 | { } | |
671 | ||
a445fddf ILT |
672 | // Update the fill value while setting section addresses. |
673 | void | |
674 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
77e65537 ILT |
675 | uint64_t, uint64_t* dot_value, |
676 | Output_section** dot_section, | |
677 | std::string* fill, Input_section_list*) | |
a445fddf | 678 | { |
77e65537 | 679 | Output_section* fill_section; |
919ed24c | 680 | uint64_t fill_val = this->val_->eval_with_dot(symtab, layout, false, |
77e65537 ILT |
681 | *dot_value, *dot_section, |
682 | &fill_section); | |
683 | if (fill_section != NULL) | |
684 | gold_warning(_("fill value is not absolute")); | |
a445fddf ILT |
685 | // FIXME: The GNU linker supports fill values of arbitrary length. |
686 | unsigned char fill_buff[4]; | |
687 | elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val); | |
688 | fill->assign(reinterpret_cast<char*>(fill_buff), 4); | |
689 | } | |
690 | ||
691 | // Print for debugging. | |
494e05f4 ILT |
692 | void |
693 | print(FILE* f) const | |
694 | { | |
695 | fprintf(f, " FILL("); | |
696 | this->val_->print(f); | |
697 | fprintf(f, ")\n"); | |
698 | } | |
699 | ||
700 | private: | |
701 | // The new fill value. | |
702 | Expression* val_; | |
703 | }; | |
704 | ||
a445fddf ILT |
705 | // Return whether STRING contains a wildcard character. This is used |
706 | // to speed up matching. | |
707 | ||
708 | static inline bool | |
709 | is_wildcard_string(const std::string& s) | |
710 | { | |
711 | return strpbrk(s.c_str(), "?*[") != NULL; | |
712 | } | |
713 | ||
494e05f4 ILT |
714 | // An input section specification in an output section |
715 | ||
716 | class Output_section_element_input : public Output_section_element | |
717 | { | |
718 | public: | |
494e05f4 ILT |
719 | Output_section_element_input(const Input_section_spec* spec, bool keep); |
720 | ||
a445fddf ILT |
721 | // Finalize symbols--just update the value of the dot symbol. |
722 | void | |
77e65537 ILT |
723 | finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value, |
724 | Output_section** dot_section) | |
a445fddf ILT |
725 | { |
726 | *dot_value = this->final_dot_value_; | |
77e65537 | 727 | *dot_section = this->final_dot_section_; |
a445fddf ILT |
728 | } |
729 | ||
730 | // See whether we match FILE_NAME and SECTION_NAME as an input | |
731 | // section. | |
732 | bool | |
733 | match_name(const char* file_name, const char* section_name) const; | |
734 | ||
735 | // Set the section address. | |
736 | void | |
737 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, | |
738 | uint64_t subalign, uint64_t* dot_value, | |
77e65537 ILT |
739 | Output_section**, std::string* fill, |
740 | Input_section_list*); | |
a445fddf ILT |
741 | |
742 | // Print for debugging. | |
494e05f4 ILT |
743 | void |
744 | print(FILE* f) const; | |
745 | ||
746 | private: | |
747 | // An input section pattern. | |
748 | struct Input_section_pattern | |
749 | { | |
750 | std::string pattern; | |
a445fddf | 751 | bool pattern_is_wildcard; |
494e05f4 ILT |
752 | Sort_wildcard sort; |
753 | ||
754 | Input_section_pattern(const char* patterna, size_t patternlena, | |
755 | Sort_wildcard sorta) | |
a445fddf ILT |
756 | : pattern(patterna, patternlena), |
757 | pattern_is_wildcard(is_wildcard_string(this->pattern)), | |
758 | sort(sorta) | |
494e05f4 ILT |
759 | { } |
760 | }; | |
761 | ||
762 | typedef std::vector<Input_section_pattern> Input_section_patterns; | |
763 | ||
a445fddf ILT |
764 | // Filename_exclusions is a pair of filename pattern and a bool |
765 | // indicating whether the filename is a wildcard. | |
766 | typedef std::vector<std::pair<std::string, bool> > Filename_exclusions; | |
767 | ||
768 | // Return whether STRING matches PATTERN, where IS_WILDCARD_PATTERN | |
769 | // indicates whether this is a wildcard pattern. | |
770 | static inline bool | |
771 | match(const char* string, const char* pattern, bool is_wildcard_pattern) | |
772 | { | |
773 | return (is_wildcard_pattern | |
774 | ? fnmatch(pattern, string, 0) == 0 | |
775 | : strcmp(string, pattern) == 0); | |
776 | } | |
494e05f4 | 777 | |
a445fddf ILT |
778 | // See if we match a file name. |
779 | bool | |
780 | match_file_name(const char* file_name) const; | |
781 | ||
782 | // The file name pattern. If this is the empty string, we match all | |
783 | // files. | |
494e05f4 | 784 | std::string filename_pattern_; |
a445fddf ILT |
785 | // Whether the file name pattern is a wildcard. |
786 | bool filename_is_wildcard_; | |
494e05f4 ILT |
787 | // How the file names should be sorted. This may only be |
788 | // SORT_WILDCARD_NONE or SORT_WILDCARD_BY_NAME. | |
789 | Sort_wildcard filename_sort_; | |
790 | // The list of file names to exclude. | |
791 | Filename_exclusions filename_exclusions_; | |
792 | // The list of input section patterns. | |
793 | Input_section_patterns input_section_patterns_; | |
794 | // Whether to keep this section when garbage collecting. | |
795 | bool keep_; | |
a445fddf ILT |
796 | // The value of dot after including all matching sections. |
797 | uint64_t final_dot_value_; | |
77e65537 ILT |
798 | // The section where dot is defined after including all matching |
799 | // sections. | |
800 | Output_section* final_dot_section_; | |
494e05f4 ILT |
801 | }; |
802 | ||
803 | // Construct Output_section_element_input. The parser records strings | |
804 | // as pointers into a copy of the script file, which will go away when | |
805 | // parsing is complete. We make sure they are in std::string objects. | |
806 | ||
807 | Output_section_element_input::Output_section_element_input( | |
808 | const Input_section_spec* spec, | |
809 | bool keep) | |
a445fddf ILT |
810 | : filename_pattern_(), |
811 | filename_is_wildcard_(false), | |
494e05f4 ILT |
812 | filename_sort_(spec->file.sort), |
813 | filename_exclusions_(), | |
814 | input_section_patterns_(), | |
a445fddf | 815 | keep_(keep), |
77e65537 ILT |
816 | final_dot_value_(0), |
817 | final_dot_section_(NULL) | |
494e05f4 | 818 | { |
a445fddf ILT |
819 | // The filename pattern "*" is common, and matches all files. Turn |
820 | // it into the empty string. | |
821 | if (spec->file.name.length != 1 || spec->file.name.value[0] != '*') | |
822 | this->filename_pattern_.assign(spec->file.name.value, | |
823 | spec->file.name.length); | |
824 | this->filename_is_wildcard_ = is_wildcard_string(this->filename_pattern_); | |
825 | ||
494e05f4 ILT |
826 | if (spec->input_sections.exclude != NULL) |
827 | { | |
828 | for (String_list::const_iterator p = | |
829 | spec->input_sections.exclude->begin(); | |
830 | p != spec->input_sections.exclude->end(); | |
831 | ++p) | |
a445fddf ILT |
832 | { |
833 | bool is_wildcard = is_wildcard_string(*p); | |
834 | this->filename_exclusions_.push_back(std::make_pair(*p, | |
835 | is_wildcard)); | |
836 | } | |
494e05f4 ILT |
837 | } |
838 | ||
839 | if (spec->input_sections.sections != NULL) | |
840 | { | |
841 | Input_section_patterns& isp(this->input_section_patterns_); | |
842 | for (String_sort_list::const_iterator p = | |
843 | spec->input_sections.sections->begin(); | |
844 | p != spec->input_sections.sections->end(); | |
845 | ++p) | |
846 | isp.push_back(Input_section_pattern(p->name.value, p->name.length, | |
847 | p->sort)); | |
848 | } | |
849 | } | |
850 | ||
a445fddf ILT |
851 | // See whether we match FILE_NAME. |
852 | ||
853 | bool | |
854 | Output_section_element_input::match_file_name(const char* file_name) const | |
855 | { | |
856 | if (!this->filename_pattern_.empty()) | |
857 | { | |
858 | // If we were called with no filename, we refuse to match a | |
859 | // pattern which requires a file name. | |
860 | if (file_name == NULL) | |
861 | return false; | |
862 | ||
863 | if (!match(file_name, this->filename_pattern_.c_str(), | |
864 | this->filename_is_wildcard_)) | |
865 | return false; | |
866 | } | |
867 | ||
868 | if (file_name != NULL) | |
869 | { | |
870 | // Now we have to see whether FILE_NAME matches one of the | |
871 | // exclusion patterns, if any. | |
872 | for (Filename_exclusions::const_iterator p = | |
873 | this->filename_exclusions_.begin(); | |
874 | p != this->filename_exclusions_.end(); | |
875 | ++p) | |
876 | { | |
877 | if (match(file_name, p->first.c_str(), p->second)) | |
878 | return false; | |
879 | } | |
880 | } | |
881 | ||
882 | return true; | |
883 | } | |
884 | ||
885 | // See whether we match FILE_NAME and SECTION_NAME. | |
886 | ||
887 | bool | |
888 | Output_section_element_input::match_name(const char* file_name, | |
889 | const char* section_name) const | |
890 | { | |
891 | if (!this->match_file_name(file_name)) | |
892 | return false; | |
893 | ||
894 | // If there are no section name patterns, then we match. | |
895 | if (this->input_section_patterns_.empty()) | |
896 | return true; | |
897 | ||
898 | // See whether we match the section name patterns. | |
899 | for (Input_section_patterns::const_iterator p = | |
900 | this->input_section_patterns_.begin(); | |
901 | p != this->input_section_patterns_.end(); | |
902 | ++p) | |
903 | { | |
904 | if (match(section_name, p->pattern.c_str(), p->pattern_is_wildcard)) | |
905 | return true; | |
906 | } | |
907 | ||
908 | // We didn't match any section names, so we didn't match. | |
909 | return false; | |
910 | } | |
911 | ||
912 | // Information we use to sort the input sections. | |
913 | ||
914 | struct Input_section_info | |
915 | { | |
916 | Relobj* relobj; | |
917 | unsigned int shndx; | |
918 | std::string section_name; | |
919 | uint64_t size; | |
920 | uint64_t addralign; | |
921 | }; | |
922 | ||
923 | // A class to sort the input sections. | |
924 | ||
925 | class Input_section_sorter | |
926 | { | |
927 | public: | |
928 | Input_section_sorter(Sort_wildcard filename_sort, Sort_wildcard section_sort) | |
929 | : filename_sort_(filename_sort), section_sort_(section_sort) | |
930 | { } | |
931 | ||
932 | bool | |
933 | operator()(const Input_section_info&, const Input_section_info&) const; | |
934 | ||
935 | private: | |
936 | Sort_wildcard filename_sort_; | |
937 | Sort_wildcard section_sort_; | |
938 | }; | |
939 | ||
940 | bool | |
941 | Input_section_sorter::operator()(const Input_section_info& isi1, | |
942 | const Input_section_info& isi2) const | |
943 | { | |
944 | if (this->section_sort_ == SORT_WILDCARD_BY_NAME | |
945 | || this->section_sort_ == SORT_WILDCARD_BY_NAME_BY_ALIGNMENT | |
946 | || (this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT_BY_NAME | |
947 | && isi1.addralign == isi2.addralign)) | |
948 | { | |
949 | if (isi1.section_name != isi2.section_name) | |
950 | return isi1.section_name < isi2.section_name; | |
951 | } | |
952 | if (this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT | |
953 | || this->section_sort_ == SORT_WILDCARD_BY_NAME_BY_ALIGNMENT | |
954 | || this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT_BY_NAME) | |
955 | { | |
956 | if (isi1.addralign != isi2.addralign) | |
957 | return isi1.addralign < isi2.addralign; | |
958 | } | |
959 | if (this->filename_sort_ == SORT_WILDCARD_BY_NAME) | |
960 | { | |
961 | if (isi1.relobj->name() != isi2.relobj->name()) | |
962 | return isi1.relobj->name() < isi2.relobj->name(); | |
963 | } | |
964 | ||
965 | // Otherwise we leave them in the same order. | |
966 | return false; | |
967 | } | |
968 | ||
969 | // Set the section address. Look in INPUT_SECTIONS for sections which | |
970 | // match this spec, sort them as specified, and add them to the output | |
971 | // section. | |
972 | ||
973 | void | |
974 | Output_section_element_input::set_section_addresses( | |
975 | Symbol_table*, | |
976 | Layout*, | |
977 | Output_section* output_section, | |
978 | uint64_t subalign, | |
979 | uint64_t* dot_value, | |
77e65537 | 980 | Output_section** dot_section, |
a445fddf ILT |
981 | std::string* fill, |
982 | Input_section_list* input_sections) | |
983 | { | |
984 | // We build a list of sections which match each | |
985 | // Input_section_pattern. | |
986 | ||
987 | typedef std::vector<std::vector<Input_section_info> > Matching_sections; | |
988 | size_t input_pattern_count = this->input_section_patterns_.size(); | |
989 | if (input_pattern_count == 0) | |
990 | input_pattern_count = 1; | |
991 | Matching_sections matching_sections(input_pattern_count); | |
992 | ||
993 | // Look through the list of sections for this output section. Add | |
994 | // each one which matches to one of the elements of | |
995 | // MATCHING_SECTIONS. | |
996 | ||
997 | Input_section_list::iterator p = input_sections->begin(); | |
998 | while (p != input_sections->end()) | |
999 | { | |
1000 | // Calling section_name and section_addralign is not very | |
1001 | // efficient. | |
1002 | Input_section_info isi; | |
1003 | isi.relobj = p->first; | |
1004 | isi.shndx = p->second; | |
1005 | ||
1006 | // Lock the object so that we can get information about the | |
1007 | // section. This is OK since we know we are single-threaded | |
1008 | // here. | |
1009 | { | |
1010 | const Task* task = reinterpret_cast<const Task*>(-1); | |
1011 | Task_lock_obj<Object> tl(task, p->first); | |
1012 | ||
1013 | isi.section_name = p->first->section_name(p->second); | |
1014 | isi.size = p->first->section_size(p->second); | |
1015 | isi.addralign = p->first->section_addralign(p->second); | |
1016 | } | |
1017 | ||
1018 | if (!this->match_file_name(isi.relobj->name().c_str())) | |
1019 | ++p; | |
1020 | else if (this->input_section_patterns_.empty()) | |
1021 | { | |
1022 | matching_sections[0].push_back(isi); | |
1023 | p = input_sections->erase(p); | |
1024 | } | |
1025 | else | |
1026 | { | |
1027 | size_t i; | |
1028 | for (i = 0; i < input_pattern_count; ++i) | |
1029 | { | |
1030 | const Input_section_pattern& | |
1031 | isp(this->input_section_patterns_[i]); | |
1032 | if (match(isi.section_name.c_str(), isp.pattern.c_str(), | |
1033 | isp.pattern_is_wildcard)) | |
1034 | break; | |
1035 | } | |
1036 | ||
1037 | if (i >= this->input_section_patterns_.size()) | |
1038 | ++p; | |
1039 | else | |
1040 | { | |
1041 | matching_sections[i].push_back(isi); | |
1042 | p = input_sections->erase(p); | |
1043 | } | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | // Look through MATCHING_SECTIONS. Sort each one as specified, | |
1048 | // using a stable sort so that we get the default order when | |
1049 | // sections are otherwise equal. Add each input section to the | |
1050 | // output section. | |
1051 | ||
1052 | for (size_t i = 0; i < input_pattern_count; ++i) | |
1053 | { | |
1054 | if (matching_sections[i].empty()) | |
1055 | continue; | |
1056 | ||
1057 | gold_assert(output_section != NULL); | |
1058 | ||
1059 | const Input_section_pattern& isp(this->input_section_patterns_[i]); | |
1060 | if (isp.sort != SORT_WILDCARD_NONE | |
1061 | || this->filename_sort_ != SORT_WILDCARD_NONE) | |
1062 | std::stable_sort(matching_sections[i].begin(), | |
1063 | matching_sections[i].end(), | |
1064 | Input_section_sorter(this->filename_sort_, | |
1065 | isp.sort)); | |
1066 | ||
1067 | for (std::vector<Input_section_info>::const_iterator p = | |
1068 | matching_sections[i].begin(); | |
1069 | p != matching_sections[i].end(); | |
1070 | ++p) | |
1071 | { | |
1072 | uint64_t this_subalign = p->addralign; | |
1073 | if (this_subalign < subalign) | |
1074 | this_subalign = subalign; | |
1075 | ||
1076 | uint64_t address = align_address(*dot_value, this_subalign); | |
1077 | ||
1078 | if (address > *dot_value && !fill->empty()) | |
1079 | { | |
1080 | section_size_type length = | |
1081 | convert_to_section_size_type(address - *dot_value); | |
1082 | std::string this_fill = this->get_fill_string(fill, length); | |
1083 | Output_section_data* posd = new Output_data_const(this_fill, 0); | |
1084 | output_section->add_output_section_data(posd); | |
1085 | } | |
1086 | ||
1087 | output_section->add_input_section_for_script(p->relobj, | |
1088 | p->shndx, | |
1089 | p->size, | |
1090 | this_subalign); | |
1091 | ||
1092 | *dot_value = address + p->size; | |
1093 | } | |
1094 | } | |
1095 | ||
1096 | this->final_dot_value_ = *dot_value; | |
77e65537 | 1097 | this->final_dot_section_ = *dot_section; |
a445fddf ILT |
1098 | } |
1099 | ||
494e05f4 ILT |
1100 | // Print for debugging. |
1101 | ||
1102 | void | |
1103 | Output_section_element_input::print(FILE* f) const | |
1104 | { | |
1105 | fprintf(f, " "); | |
1106 | ||
1107 | if (this->keep_) | |
1108 | fprintf(f, "KEEP("); | |
1109 | ||
1110 | if (!this->filename_pattern_.empty()) | |
1111 | { | |
1112 | bool need_close_paren = false; | |
1113 | switch (this->filename_sort_) | |
1114 | { | |
1115 | case SORT_WILDCARD_NONE: | |
1116 | break; | |
1117 | case SORT_WILDCARD_BY_NAME: | |
1118 | fprintf(f, "SORT_BY_NAME("); | |
1119 | need_close_paren = true; | |
1120 | break; | |
1121 | default: | |
1122 | gold_unreachable(); | |
1123 | } | |
1124 | ||
1125 | fprintf(f, "%s", this->filename_pattern_.c_str()); | |
1126 | ||
1127 | if (need_close_paren) | |
1128 | fprintf(f, ")"); | |
1129 | } | |
1130 | ||
1131 | if (!this->input_section_patterns_.empty() | |
1132 | || !this->filename_exclusions_.empty()) | |
1133 | { | |
1134 | fprintf(f, "("); | |
1135 | ||
1136 | bool need_space = false; | |
1137 | if (!this->filename_exclusions_.empty()) | |
1138 | { | |
1139 | fprintf(f, "EXCLUDE_FILE("); | |
1140 | bool need_comma = false; | |
1141 | for (Filename_exclusions::const_iterator p = | |
1142 | this->filename_exclusions_.begin(); | |
1143 | p != this->filename_exclusions_.end(); | |
1144 | ++p) | |
1145 | { | |
1146 | if (need_comma) | |
1147 | fprintf(f, ", "); | |
a445fddf | 1148 | fprintf(f, "%s", p->first.c_str()); |
494e05f4 ILT |
1149 | need_comma = true; |
1150 | } | |
1151 | fprintf(f, ")"); | |
1152 | need_space = true; | |
1153 | } | |
1154 | ||
1155 | for (Input_section_patterns::const_iterator p = | |
1156 | this->input_section_patterns_.begin(); | |
1157 | p != this->input_section_patterns_.end(); | |
1158 | ++p) | |
1159 | { | |
1160 | if (need_space) | |
1161 | fprintf(f, " "); | |
1162 | ||
1163 | int close_parens = 0; | |
1164 | switch (p->sort) | |
1165 | { | |
1166 | case SORT_WILDCARD_NONE: | |
1167 | break; | |
1168 | case SORT_WILDCARD_BY_NAME: | |
1169 | fprintf(f, "SORT_BY_NAME("); | |
1170 | close_parens = 1; | |
1171 | break; | |
1172 | case SORT_WILDCARD_BY_ALIGNMENT: | |
1173 | fprintf(f, "SORT_BY_ALIGNMENT("); | |
1174 | close_parens = 1; | |
1175 | break; | |
1176 | case SORT_WILDCARD_BY_NAME_BY_ALIGNMENT: | |
1177 | fprintf(f, "SORT_BY_NAME(SORT_BY_ALIGNMENT("); | |
1178 | close_parens = 2; | |
1179 | break; | |
1180 | case SORT_WILDCARD_BY_ALIGNMENT_BY_NAME: | |
1181 | fprintf(f, "SORT_BY_ALIGNMENT(SORT_BY_NAME("); | |
1182 | close_parens = 2; | |
1183 | break; | |
1184 | default: | |
1185 | gold_unreachable(); | |
1186 | } | |
1187 | ||
1188 | fprintf(f, "%s", p->pattern.c_str()); | |
1189 | ||
1190 | for (int i = 0; i < close_parens; ++i) | |
1191 | fprintf(f, ")"); | |
1192 | ||
1193 | need_space = true; | |
1194 | } | |
1195 | ||
1196 | fprintf(f, ")"); | |
1197 | } | |
1198 | ||
1199 | if (this->keep_) | |
1200 | fprintf(f, ")"); | |
1201 | ||
1202 | fprintf(f, "\n"); | |
1203 | } | |
1204 | ||
1205 | // An output section. | |
1206 | ||
1207 | class Output_section_definition : public Sections_element | |
1208 | { | |
1209 | public: | |
a445fddf ILT |
1210 | typedef Output_section_element::Input_section_list Input_section_list; |
1211 | ||
494e05f4 ILT |
1212 | Output_section_definition(const char* name, size_t namelen, |
1213 | const Parser_output_section_header* header); | |
1214 | ||
1215 | // Finish the output section with the information in the trailer. | |
1216 | void | |
1217 | finish(const Parser_output_section_trailer* trailer); | |
1218 | ||
1219 | // Add a symbol to be defined. | |
1220 | void | |
1221 | add_symbol_assignment(const char* name, size_t length, Expression* value, | |
1222 | bool provide, bool hidden); | |
a445fddf ILT |
1223 | |
1224 | // Add an assignment to the special dot symbol. | |
1225 | void | |
1226 | add_dot_assignment(Expression* value); | |
1227 | ||
494e05f4 ILT |
1228 | // Add an assertion. |
1229 | void | |
1230 | add_assertion(Expression* check, const char* message, size_t messagelen); | |
1231 | ||
1232 | // Add a data item to the current output section. | |
1233 | void | |
1234 | add_data(int size, bool is_signed, Expression* val); | |
1235 | ||
1236 | // Add a setting for the fill value. | |
1237 | void | |
1238 | add_fill(Expression* val); | |
1239 | ||
1240 | // Add an input section specification. | |
1241 | void | |
1242 | add_input_section(const Input_section_spec* spec, bool keep); | |
1243 | ||
2d924fd9 ILT |
1244 | // Record that the output section is relro. |
1245 | void | |
1246 | set_is_relro() | |
1247 | { this->is_relro_ = true; } | |
1248 | ||
919ed24c ILT |
1249 | // Create any required output sections. |
1250 | void | |
1251 | create_sections(Layout*); | |
1252 | ||
a445fddf ILT |
1253 | // Add any symbols being defined to the symbol table. |
1254 | void | |
1255 | add_symbols_to_table(Symbol_table* symtab); | |
1256 | ||
1257 | // Finalize symbols and check assertions. | |
1258 | void | |
77e65537 | 1259 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*); |
a445fddf ILT |
1260 | |
1261 | // Return the output section name to use for an input file name and | |
1262 | // section name. | |
1263 | const char* | |
1264 | output_section_name(const char* file_name, const char* section_name, | |
1265 | Output_section***); | |
1266 | ||
1267 | // Return whether to place an orphan section after this one. | |
1268 | bool | |
2d924fd9 | 1269 | place_orphan_here(const Output_section *os, bool* exact, bool*) const; |
a445fddf ILT |
1270 | |
1271 | // Set the section address. | |
1272 | void | |
1273 | set_section_addresses(Symbol_table* symtab, Layout* layout, | |
fd247bfe | 1274 | uint64_t* dot_value, uint64_t* load_address); |
a445fddf | 1275 | |
3802b2dd ILT |
1276 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
1277 | // this section is constrained, and the input sections do not match, | |
1278 | // return the constraint, and set *POSD. | |
1279 | Section_constraint | |
1280 | check_constraint(Output_section_definition** posd); | |
1281 | ||
1282 | // See if this is the alternate output section for a constrained | |
1283 | // output section. If it is, transfer the Output_section and return | |
1284 | // true. Otherwise return false. | |
1285 | bool | |
1286 | alternate_constraint(Output_section_definition*, Section_constraint); | |
1287 | ||
1c4f3631 | 1288 | // Get the list of segments to use for an allocated section when |
2cefc357 | 1289 | // using a PHDRS clause. |
1c4f3631 | 1290 | Output_section* |
2cefc357 | 1291 | allocate_to_segment(String_list** phdrs_list, bool* orphan); |
1c4f3631 | 1292 | |
8f2eb564 ILT |
1293 | // Look for an output section by name and return the address, the |
1294 | // load address, the alignment, and the size. This is used when an | |
1295 | // expression refers to an output section which was not actually | |
1296 | // created. This returns true if the section was found, false | |
1297 | // otherwise. | |
1298 | bool | |
1299 | get_output_section_info(const char*, uint64_t*, uint64_t*, uint64_t*, | |
1300 | uint64_t*) const; | |
1301 | ||
2d924fd9 ILT |
1302 | // Return the associated Output_section if there is one. |
1303 | Output_section* | |
1304 | get_output_section() const | |
1305 | { return this->output_section_; } | |
1306 | ||
494e05f4 ILT |
1307 | // Print the contents to the FILE. This is for debugging. |
1308 | void | |
1309 | print(FILE*) const; | |
1310 | ||
1311 | private: | |
1312 | typedef std::vector<Output_section_element*> Output_section_elements; | |
1313 | ||
1314 | // The output section name. | |
1315 | std::string name_; | |
1316 | // The address. This may be NULL. | |
1317 | Expression* address_; | |
1318 | // The load address. This may be NULL. | |
1319 | Expression* load_address_; | |
1320 | // The alignment. This may be NULL. | |
1321 | Expression* align_; | |
1322 | // The input section alignment. This may be NULL. | |
1323 | Expression* subalign_; | |
3802b2dd ILT |
1324 | // The constraint, if any. |
1325 | Section_constraint constraint_; | |
494e05f4 ILT |
1326 | // The fill value. This may be NULL. |
1327 | Expression* fill_; | |
1c4f3631 ILT |
1328 | // The list of segments this section should go into. This may be |
1329 | // NULL. | |
1330 | String_list* phdrs_; | |
494e05f4 ILT |
1331 | // The list of elements defining the section. |
1332 | Output_section_elements elements_; | |
a445fddf ILT |
1333 | // The Output_section created for this definition. This will be |
1334 | // NULL if none was created. | |
1335 | Output_section* output_section_; | |
8f2eb564 ILT |
1336 | // The address after it has been evaluated. |
1337 | uint64_t evaluated_address_; | |
1338 | // The load address after it has been evaluated. | |
1339 | uint64_t evaluated_load_address_; | |
1340 | // The alignment after it has been evaluated. | |
1341 | uint64_t evaluated_addralign_; | |
2d924fd9 ILT |
1342 | // The output section is relro. |
1343 | bool is_relro_; | |
494e05f4 ILT |
1344 | }; |
1345 | ||
1346 | // Constructor. | |
1347 | ||
1348 | Output_section_definition::Output_section_definition( | |
1349 | const char* name, | |
1350 | size_t namelen, | |
1351 | const Parser_output_section_header* header) | |
1352 | : name_(name, namelen), | |
1353 | address_(header->address), | |
1354 | load_address_(header->load_address), | |
1355 | align_(header->align), | |
1356 | subalign_(header->subalign), | |
3802b2dd | 1357 | constraint_(header->constraint), |
494e05f4 | 1358 | fill_(NULL), |
1c4f3631 | 1359 | phdrs_(NULL), |
a445fddf | 1360 | elements_(), |
2d924fd9 ILT |
1361 | output_section_(NULL), |
1362 | evaluated_address_(0), | |
1363 | evaluated_load_address_(0), | |
1364 | evaluated_addralign_(0), | |
1365 | is_relro_(false) | |
494e05f4 ILT |
1366 | { |
1367 | } | |
1368 | ||
1369 | // Finish an output section. | |
1370 | ||
1371 | void | |
1372 | Output_section_definition::finish(const Parser_output_section_trailer* trailer) | |
1373 | { | |
1374 | this->fill_ = trailer->fill; | |
1c4f3631 | 1375 | this->phdrs_ = trailer->phdrs; |
494e05f4 ILT |
1376 | } |
1377 | ||
1378 | // Add a symbol to be defined. | |
1379 | ||
1380 | void | |
1381 | Output_section_definition::add_symbol_assignment(const char* name, | |
1382 | size_t length, | |
1383 | Expression* value, | |
1384 | bool provide, | |
1385 | bool hidden) | |
1386 | { | |
1387 | Output_section_element* p = new Output_section_element_assignment(name, | |
1388 | length, | |
1389 | value, | |
1390 | provide, | |
1391 | hidden); | |
1392 | this->elements_.push_back(p); | |
1393 | } | |
1394 | ||
a445fddf | 1395 | // Add an assignment to the special dot symbol. |
494e05f4 ILT |
1396 | |
1397 | void | |
a445fddf ILT |
1398 | Output_section_definition::add_dot_assignment(Expression* value) |
1399 | { | |
1400 | Output_section_element* p = new Output_section_element_dot_assignment(value); | |
1401 | this->elements_.push_back(p); | |
1402 | } | |
1403 | ||
1404 | // Add an assertion. | |
1405 | ||
1406 | void | |
1407 | Output_section_definition::add_assertion(Expression* check, | |
1408 | const char* message, | |
494e05f4 ILT |
1409 | size_t messagelen) |
1410 | { | |
1411 | Output_section_element* p = new Output_section_element_assertion(check, | |
1412 | message, | |
1413 | messagelen); | |
1414 | this->elements_.push_back(p); | |
1415 | } | |
1416 | ||
1417 | // Add a data item to the current output section. | |
1418 | ||
1419 | void | |
1420 | Output_section_definition::add_data(int size, bool is_signed, Expression* val) | |
1421 | { | |
1422 | Output_section_element* p = new Output_section_element_data(size, is_signed, | |
1423 | val); | |
1424 | this->elements_.push_back(p); | |
1425 | } | |
1426 | ||
1427 | // Add a setting for the fill value. | |
1428 | ||
1429 | void | |
1430 | Output_section_definition::add_fill(Expression* val) | |
1431 | { | |
1432 | Output_section_element* p = new Output_section_element_fill(val); | |
1433 | this->elements_.push_back(p); | |
1434 | } | |
1435 | ||
1436 | // Add an input section specification. | |
1437 | ||
1438 | void | |
1439 | Output_section_definition::add_input_section(const Input_section_spec* spec, | |
1440 | bool keep) | |
1441 | { | |
1442 | Output_section_element* p = new Output_section_element_input(spec, keep); | |
1443 | this->elements_.push_back(p); | |
1444 | } | |
1445 | ||
919ed24c ILT |
1446 | // Create any required output sections. We need an output section if |
1447 | // there is a data statement here. | |
1448 | ||
1449 | void | |
1450 | Output_section_definition::create_sections(Layout* layout) | |
1451 | { | |
1452 | if (this->output_section_ != NULL) | |
1453 | return; | |
1454 | for (Output_section_elements::const_iterator p = this->elements_.begin(); | |
1455 | p != this->elements_.end(); | |
1456 | ++p) | |
1457 | { | |
1458 | if ((*p)->needs_output_section()) | |
1459 | { | |
1460 | const char* name = this->name_.c_str(); | |
1461 | this->output_section_ = layout->make_output_section_for_script(name); | |
1462 | return; | |
1463 | } | |
1464 | } | |
1465 | } | |
1466 | ||
a445fddf ILT |
1467 | // Add any symbols being defined to the symbol table. |
1468 | ||
1469 | void | |
1470 | Output_section_definition::add_symbols_to_table(Symbol_table* symtab) | |
1471 | { | |
1472 | for (Output_section_elements::iterator p = this->elements_.begin(); | |
1473 | p != this->elements_.end(); | |
1474 | ++p) | |
1475 | (*p)->add_symbols_to_table(symtab); | |
1476 | } | |
1477 | ||
1478 | // Finalize symbols and check assertions. | |
1479 | ||
1480 | void | |
1481 | Output_section_definition::finalize_symbols(Symbol_table* symtab, | |
1482 | const Layout* layout, | |
a445fddf ILT |
1483 | uint64_t* dot_value) |
1484 | { | |
1485 | if (this->output_section_ != NULL) | |
1486 | *dot_value = this->output_section_->address(); | |
1487 | else | |
1488 | { | |
1489 | uint64_t address = *dot_value; | |
1490 | if (this->address_ != NULL) | |
1491 | { | |
77e65537 | 1492 | Output_section* dummy; |
919ed24c | 1493 | address = this->address_->eval_with_dot(symtab, layout, true, |
77e65537 | 1494 | *dot_value, NULL, |
a445fddf ILT |
1495 | &dummy); |
1496 | } | |
1497 | if (this->align_ != NULL) | |
1498 | { | |
77e65537 | 1499 | Output_section* dummy; |
919ed24c | 1500 | uint64_t align = this->align_->eval_with_dot(symtab, layout, true, |
a445fddf | 1501 | *dot_value, |
77e65537 | 1502 | NULL, |
a445fddf ILT |
1503 | &dummy); |
1504 | address = align_address(address, align); | |
1505 | } | |
1506 | *dot_value = address; | |
1507 | } | |
a445fddf | 1508 | |
77e65537 | 1509 | Output_section* dot_section = this->output_section_; |
a445fddf ILT |
1510 | for (Output_section_elements::iterator p = this->elements_.begin(); |
1511 | p != this->elements_.end(); | |
1512 | ++p) | |
77e65537 | 1513 | (*p)->finalize_symbols(symtab, layout, dot_value, &dot_section); |
a445fddf ILT |
1514 | } |
1515 | ||
1516 | // Return the output section name to use for an input section name. | |
1517 | ||
1518 | const char* | |
1519 | Output_section_definition::output_section_name(const char* file_name, | |
1520 | const char* section_name, | |
1521 | Output_section*** slot) | |
1522 | { | |
1523 | // Ask each element whether it matches NAME. | |
1524 | for (Output_section_elements::const_iterator p = this->elements_.begin(); | |
1525 | p != this->elements_.end(); | |
1526 | ++p) | |
1527 | { | |
1528 | if ((*p)->match_name(file_name, section_name)) | |
1529 | { | |
1530 | // We found a match for NAME, which means that it should go | |
1531 | // into this output section. | |
1532 | *slot = &this->output_section_; | |
1533 | return this->name_.c_str(); | |
1534 | } | |
1535 | } | |
1536 | ||
1537 | // We don't know about this section name. | |
1538 | return NULL; | |
1539 | } | |
1540 | ||
1541 | // Return whether to place an orphan output section after this | |
1542 | // section. | |
1543 | ||
1544 | bool | |
1545 | Output_section_definition::place_orphan_here(const Output_section *os, | |
2d924fd9 ILT |
1546 | bool* exact, |
1547 | bool* is_relro) const | |
a445fddf | 1548 | { |
2d924fd9 ILT |
1549 | *is_relro = this->is_relro_; |
1550 | ||
a445fddf ILT |
1551 | // Check for the simple case first. |
1552 | if (this->output_section_ != NULL | |
1553 | && this->output_section_->type() == os->type() | |
1554 | && this->output_section_->flags() == os->flags()) | |
1555 | { | |
1556 | *exact = true; | |
1557 | return true; | |
1558 | } | |
1559 | ||
1560 | // Otherwise use some heuristics. | |
1561 | ||
1562 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
1563 | return false; | |
1564 | ||
1565 | if (os->type() == elfcpp::SHT_NOBITS) | |
1566 | { | |
1c4f3631 ILT |
1567 | if (this->name_ == ".bss") |
1568 | { | |
1569 | *exact = true; | |
1570 | return true; | |
1571 | } | |
a445fddf ILT |
1572 | if (this->output_section_ != NULL |
1573 | && this->output_section_->type() == elfcpp::SHT_NOBITS) | |
1574 | return true; | |
a445fddf ILT |
1575 | } |
1576 | else if (os->type() == elfcpp::SHT_NOTE) | |
1577 | { | |
1578 | if (this->output_section_ != NULL | |
1579 | && this->output_section_->type() == elfcpp::SHT_NOTE) | |
1c4f3631 ILT |
1580 | { |
1581 | *exact = true; | |
1582 | return true; | |
1583 | } | |
1584 | if (this->name_.compare(0, 5, ".note") == 0) | |
1585 | { | |
1586 | *exact = true; | |
1587 | return true; | |
1588 | } | |
1589 | if (this->name_ == ".interp") | |
a445fddf | 1590 | return true; |
1c4f3631 ILT |
1591 | if (this->output_section_ != NULL |
1592 | && this->output_section_->type() == elfcpp::SHT_PROGBITS | |
1593 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) == 0) | |
a445fddf ILT |
1594 | return true; |
1595 | } | |
1596 | else if (os->type() == elfcpp::SHT_REL || os->type() == elfcpp::SHT_RELA) | |
1597 | { | |
1c4f3631 ILT |
1598 | if (this->name_.compare(0, 4, ".rel") == 0) |
1599 | { | |
1600 | *exact = true; | |
1601 | return true; | |
1602 | } | |
a445fddf ILT |
1603 | if (this->output_section_ != NULL |
1604 | && (this->output_section_->type() == elfcpp::SHT_REL | |
1605 | || this->output_section_->type() == elfcpp::SHT_RELA)) | |
1c4f3631 ILT |
1606 | { |
1607 | *exact = true; | |
1608 | return true; | |
1609 | } | |
1610 | if (this->output_section_ != NULL | |
1611 | && this->output_section_->type() == elfcpp::SHT_PROGBITS | |
1612 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) == 0) | |
a445fddf ILT |
1613 | return true; |
1614 | } | |
1615 | else if (os->type() == elfcpp::SHT_PROGBITS | |
1616 | && (os->flags() & elfcpp::SHF_WRITE) != 0) | |
1617 | { | |
1c4f3631 ILT |
1618 | if (this->name_ == ".data") |
1619 | { | |
1620 | *exact = true; | |
1621 | return true; | |
1622 | } | |
a445fddf ILT |
1623 | if (this->output_section_ != NULL |
1624 | && this->output_section_->type() == elfcpp::SHT_PROGBITS | |
1625 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) != 0) | |
1626 | return true; | |
a445fddf ILT |
1627 | } |
1628 | else if (os->type() == elfcpp::SHT_PROGBITS | |
1629 | && (os->flags() & elfcpp::SHF_EXECINSTR) != 0) | |
1630 | { | |
1c4f3631 ILT |
1631 | if (this->name_ == ".text") |
1632 | { | |
1633 | *exact = true; | |
1634 | return true; | |
1635 | } | |
a445fddf ILT |
1636 | if (this->output_section_ != NULL |
1637 | && this->output_section_->type() == elfcpp::SHT_PROGBITS | |
1638 | && (this->output_section_->flags() & elfcpp::SHF_EXECINSTR) != 0) | |
1639 | return true; | |
a445fddf | 1640 | } |
1c4f3631 ILT |
1641 | else if (os->type() == elfcpp::SHT_PROGBITS |
1642 | || (os->type() != elfcpp::SHT_PROGBITS | |
1643 | && (os->flags() & elfcpp::SHF_WRITE) == 0)) | |
a445fddf | 1644 | { |
1c4f3631 ILT |
1645 | if (this->name_ == ".rodata") |
1646 | { | |
1647 | *exact = true; | |
1648 | return true; | |
1649 | } | |
a445fddf ILT |
1650 | if (this->output_section_ != NULL |
1651 | && this->output_section_->type() == elfcpp::SHT_PROGBITS | |
1c4f3631 | 1652 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) == 0) |
a445fddf ILT |
1653 | return true; |
1654 | } | |
1655 | ||
1656 | return false; | |
1657 | } | |
1658 | ||
1659 | // Set the section address. Note that the OUTPUT_SECTION_ field will | |
1660 | // be NULL if no input sections were mapped to this output section. | |
1661 | // We still have to adjust dot and process symbol assignments. | |
1662 | ||
1663 | void | |
1664 | Output_section_definition::set_section_addresses(Symbol_table* symtab, | |
1665 | Layout* layout, | |
fd247bfe ILT |
1666 | uint64_t* dot_value, |
1667 | uint64_t* load_address) | |
a445fddf | 1668 | { |
a445fddf | 1669 | uint64_t address; |
77e65537 ILT |
1670 | if (this->address_ == NULL) |
1671 | address = *dot_value; | |
a445fddf ILT |
1672 | else |
1673 | { | |
77e65537 | 1674 | Output_section* dummy; |
919ed24c ILT |
1675 | address = this->address_->eval_with_dot(symtab, layout, true, |
1676 | *dot_value, NULL, &dummy); | |
a445fddf ILT |
1677 | } |
1678 | ||
1679 | uint64_t align; | |
1680 | if (this->align_ == NULL) | |
1681 | { | |
1682 | if (this->output_section_ == NULL) | |
1683 | align = 0; | |
1684 | else | |
1685 | align = this->output_section_->addralign(); | |
1686 | } | |
1687 | else | |
1688 | { | |
77e65537 | 1689 | Output_section* align_section; |
919ed24c | 1690 | align = this->align_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 ILT |
1691 | NULL, &align_section); |
1692 | if (align_section != NULL) | |
1693 | gold_warning(_("alignment of section %s is not absolute"), | |
1694 | this->name_.c_str()); | |
a445fddf ILT |
1695 | if (this->output_section_ != NULL) |
1696 | this->output_section_->set_addralign(align); | |
1697 | } | |
1698 | ||
1699 | address = align_address(address, align); | |
1700 | ||
fd247bfe ILT |
1701 | uint64_t start_address = address; |
1702 | ||
a445fddf | 1703 | *dot_value = address; |
a445fddf ILT |
1704 | |
1705 | // The address of non-SHF_ALLOC sections is forced to zero, | |
1706 | // regardless of what the linker script wants. | |
1707 | if (this->output_section_ != NULL | |
1708 | && (this->output_section_->flags() & elfcpp::SHF_ALLOC) != 0) | |
1709 | this->output_section_->set_address(address); | |
1710 | ||
8f2eb564 ILT |
1711 | this->evaluated_address_ = address; |
1712 | this->evaluated_addralign_ = align; | |
1713 | ||
1714 | if (this->load_address_ == NULL) | |
1715 | this->evaluated_load_address_ = address; | |
1716 | else | |
a445fddf | 1717 | { |
77e65537 | 1718 | Output_section* dummy; |
a445fddf | 1719 | uint64_t load_address = |
919ed24c | 1720 | this->load_address_->eval_with_dot(symtab, layout, true, *dot_value, |
77e65537 | 1721 | this->output_section_, &dummy); |
8f2eb564 ILT |
1722 | if (this->output_section_ != NULL) |
1723 | this->output_section_->set_load_address(load_address); | |
1724 | this->evaluated_load_address_ = load_address; | |
a445fddf ILT |
1725 | } |
1726 | ||
1727 | uint64_t subalign; | |
1728 | if (this->subalign_ == NULL) | |
1729 | subalign = 0; | |
1730 | else | |
1731 | { | |
77e65537 | 1732 | Output_section* subalign_section; |
919ed24c ILT |
1733 | subalign = this->subalign_->eval_with_dot(symtab, layout, true, |
1734 | *dot_value, NULL, | |
1735 | &subalign_section); | |
77e65537 ILT |
1736 | if (subalign_section != NULL) |
1737 | gold_warning(_("subalign of section %s is not absolute"), | |
1738 | this->name_.c_str()); | |
a445fddf ILT |
1739 | } |
1740 | ||
1741 | std::string fill; | |
1742 | if (this->fill_ != NULL) | |
1743 | { | |
1744 | // FIXME: The GNU linker supports fill values of arbitrary | |
1745 | // length. | |
77e65537 | 1746 | Output_section* fill_section; |
919ed24c | 1747 | uint64_t fill_val = this->fill_->eval_with_dot(symtab, layout, true, |
a445fddf | 1748 | *dot_value, |
77e65537 ILT |
1749 | NULL, |
1750 | &fill_section); | |
1751 | if (fill_section != NULL) | |
1752 | gold_warning(_("fill of section %s is not absolute"), | |
1753 | this->name_.c_str()); | |
a445fddf ILT |
1754 | unsigned char fill_buff[4]; |
1755 | elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val); | |
1756 | fill.assign(reinterpret_cast<char*>(fill_buff), 4); | |
1757 | } | |
1758 | ||
1759 | Input_section_list input_sections; | |
1760 | if (this->output_section_ != NULL) | |
1761 | { | |
1762 | // Get the list of input sections attached to this output | |
1763 | // section. This will leave the output section with only | |
1764 | // Output_section_data entries. | |
1765 | address += this->output_section_->get_input_sections(address, | |
1766 | fill, | |
1767 | &input_sections); | |
1768 | *dot_value = address; | |
1769 | } | |
1770 | ||
77e65537 | 1771 | Output_section* dot_section = this->output_section_; |
a445fddf ILT |
1772 | for (Output_section_elements::iterator p = this->elements_.begin(); |
1773 | p != this->elements_.end(); | |
1774 | ++p) | |
1775 | (*p)->set_section_addresses(symtab, layout, this->output_section_, | |
77e65537 ILT |
1776 | subalign, dot_value, &dot_section, &fill, |
1777 | &input_sections); | |
a445fddf ILT |
1778 | |
1779 | gold_assert(input_sections.empty()); | |
fd247bfe ILT |
1780 | |
1781 | if (this->load_address_ == NULL || this->output_section_ == NULL) | |
1782 | *load_address = *dot_value; | |
1783 | else | |
1784 | *load_address = (this->output_section_->load_address() | |
1785 | + (*dot_value - start_address)); | |
2d924fd9 ILT |
1786 | |
1787 | if (this->output_section_ != NULL) | |
1788 | { | |
1789 | if (this->is_relro_) | |
1790 | this->output_section_->set_is_relro(); | |
1791 | else | |
1792 | this->output_section_->clear_is_relro(); | |
1793 | } | |
a445fddf ILT |
1794 | } |
1795 | ||
3802b2dd ILT |
1796 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
1797 | // this section is constrained, and the input sections do not match, | |
1798 | // return the constraint, and set *POSD. | |
1799 | ||
1800 | Section_constraint | |
1801 | Output_section_definition::check_constraint(Output_section_definition** posd) | |
1802 | { | |
1803 | switch (this->constraint_) | |
1804 | { | |
1805 | case CONSTRAINT_NONE: | |
1806 | return CONSTRAINT_NONE; | |
1807 | ||
1808 | case CONSTRAINT_ONLY_IF_RO: | |
1809 | if (this->output_section_ != NULL | |
1810 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) != 0) | |
1811 | { | |
1812 | *posd = this; | |
1813 | return CONSTRAINT_ONLY_IF_RO; | |
1814 | } | |
1815 | return CONSTRAINT_NONE; | |
1816 | ||
1817 | case CONSTRAINT_ONLY_IF_RW: | |
1818 | if (this->output_section_ != NULL | |
1819 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) == 0) | |
1820 | { | |
1821 | *posd = this; | |
1822 | return CONSTRAINT_ONLY_IF_RW; | |
1823 | } | |
1824 | return CONSTRAINT_NONE; | |
1825 | ||
1826 | case CONSTRAINT_SPECIAL: | |
1827 | if (this->output_section_ != NULL) | |
1828 | gold_error(_("SPECIAL constraints are not implemented")); | |
1829 | return CONSTRAINT_NONE; | |
1830 | ||
1831 | default: | |
1832 | gold_unreachable(); | |
1833 | } | |
1834 | } | |
1835 | ||
1836 | // See if this is the alternate output section for a constrained | |
1837 | // output section. If it is, transfer the Output_section and return | |
1838 | // true. Otherwise return false. | |
1839 | ||
1840 | bool | |
1841 | Output_section_definition::alternate_constraint( | |
1842 | Output_section_definition* posd, | |
1843 | Section_constraint constraint) | |
1844 | { | |
1845 | if (this->name_ != posd->name_) | |
1846 | return false; | |
1847 | ||
1848 | switch (constraint) | |
1849 | { | |
1850 | case CONSTRAINT_ONLY_IF_RO: | |
1851 | if (this->constraint_ != CONSTRAINT_ONLY_IF_RW) | |
1852 | return false; | |
1853 | break; | |
1854 | ||
1855 | case CONSTRAINT_ONLY_IF_RW: | |
1856 | if (this->constraint_ != CONSTRAINT_ONLY_IF_RO) | |
1857 | return false; | |
1858 | break; | |
1859 | ||
1860 | default: | |
1861 | gold_unreachable(); | |
1862 | } | |
1863 | ||
1864 | // We have found the alternate constraint. We just need to move | |
1865 | // over the Output_section. When constraints are used properly, | |
1866 | // THIS should not have an output_section pointer, as all the input | |
1867 | // sections should have matched the other definition. | |
1868 | ||
1869 | if (this->output_section_ != NULL) | |
1870 | gold_error(_("mismatched definition for constrained sections")); | |
1871 | ||
1872 | this->output_section_ = posd->output_section_; | |
1873 | posd->output_section_ = NULL; | |
1874 | ||
2d924fd9 ILT |
1875 | if (this->is_relro_) |
1876 | this->output_section_->set_is_relro(); | |
1877 | else | |
1878 | this->output_section_->clear_is_relro(); | |
1879 | ||
3802b2dd ILT |
1880 | return true; |
1881 | } | |
1882 | ||
1c4f3631 | 1883 | // Get the list of segments to use for an allocated section when using |
2cefc357 | 1884 | // a PHDRS clause. |
1c4f3631 ILT |
1885 | |
1886 | Output_section* | |
2cefc357 ILT |
1887 | Output_section_definition::allocate_to_segment(String_list** phdrs_list, |
1888 | bool* orphan) | |
1c4f3631 ILT |
1889 | { |
1890 | if (this->output_section_ == NULL) | |
1891 | return NULL; | |
1892 | if ((this->output_section_->flags() & elfcpp::SHF_ALLOC) == 0) | |
1893 | return NULL; | |
2cefc357 | 1894 | *orphan = false; |
1c4f3631 ILT |
1895 | if (this->phdrs_ != NULL) |
1896 | *phdrs_list = this->phdrs_; | |
1897 | return this->output_section_; | |
1898 | } | |
1899 | ||
8f2eb564 ILT |
1900 | // Look for an output section by name and return the address, the load |
1901 | // address, the alignment, and the size. This is used when an | |
1902 | // expression refers to an output section which was not actually | |
1903 | // created. This returns true if the section was found, false | |
1904 | // otherwise. | |
1905 | ||
1906 | bool | |
1907 | Output_section_definition::get_output_section_info(const char* name, | |
1908 | uint64_t* address, | |
1909 | uint64_t* load_address, | |
1910 | uint64_t* addralign, | |
1911 | uint64_t* size) const | |
1912 | { | |
1913 | if (this->name_ != name) | |
1914 | return false; | |
1915 | ||
1916 | if (this->output_section_ != NULL) | |
1917 | { | |
1918 | *address = this->output_section_->address(); | |
1919 | if (this->output_section_->has_load_address()) | |
1920 | *load_address = this->output_section_->load_address(); | |
1921 | else | |
1922 | *load_address = *address; | |
1923 | *addralign = this->output_section_->addralign(); | |
1924 | *size = this->output_section_->current_data_size(); | |
1925 | } | |
1926 | else | |
1927 | { | |
1928 | *address = this->evaluated_address_; | |
1929 | *load_address = this->evaluated_load_address_; | |
1930 | *addralign = this->evaluated_addralign_; | |
1931 | *size = 0; | |
1932 | } | |
1933 | ||
1934 | return true; | |
1935 | } | |
1936 | ||
494e05f4 ILT |
1937 | // Print for debugging. |
1938 | ||
1939 | void | |
1940 | Output_section_definition::print(FILE* f) const | |
1941 | { | |
1942 | fprintf(f, " %s ", this->name_.c_str()); | |
1943 | ||
1944 | if (this->address_ != NULL) | |
1945 | { | |
1946 | this->address_->print(f); | |
1947 | fprintf(f, " "); | |
1948 | } | |
1949 | ||
1950 | fprintf(f, ": "); | |
1951 | ||
1952 | if (this->load_address_ != NULL) | |
1953 | { | |
1954 | fprintf(f, "AT("); | |
1955 | this->load_address_->print(f); | |
1956 | fprintf(f, ") "); | |
1957 | } | |
1958 | ||
1959 | if (this->align_ != NULL) | |
1960 | { | |
1961 | fprintf(f, "ALIGN("); | |
1962 | this->align_->print(f); | |
1963 | fprintf(f, ") "); | |
1964 | } | |
1965 | ||
1966 | if (this->subalign_ != NULL) | |
1967 | { | |
1968 | fprintf(f, "SUBALIGN("); | |
1969 | this->subalign_->print(f); | |
1970 | fprintf(f, ") "); | |
1971 | } | |
1972 | ||
1973 | fprintf(f, "{\n"); | |
1974 | ||
1975 | for (Output_section_elements::const_iterator p = this->elements_.begin(); | |
1976 | p != this->elements_.end(); | |
1977 | ++p) | |
1978 | (*p)->print(f); | |
1979 | ||
1980 | fprintf(f, " }"); | |
1981 | ||
1982 | if (this->fill_ != NULL) | |
1983 | { | |
1984 | fprintf(f, " = "); | |
1985 | this->fill_->print(f); | |
1986 | } | |
1987 | ||
7d26c6cc ILT |
1988 | if (this->phdrs_ != NULL) |
1989 | { | |
1990 | for (String_list::const_iterator p = this->phdrs_->begin(); | |
1991 | p != this->phdrs_->end(); | |
1992 | ++p) | |
1993 | fprintf(f, " :%s", p->c_str()); | |
1994 | } | |
1995 | ||
494e05f4 ILT |
1996 | fprintf(f, "\n"); |
1997 | } | |
1998 | ||
a445fddf ILT |
1999 | // An output section created to hold orphaned input sections. These |
2000 | // do not actually appear in linker scripts. However, for convenience | |
2001 | // when setting the output section addresses, we put a marker to these | |
2002 | // sections in the appropriate place in the list of SECTIONS elements. | |
2003 | ||
2004 | class Orphan_output_section : public Sections_element | |
2005 | { | |
2006 | public: | |
2007 | Orphan_output_section(Output_section* os) | |
2008 | : os_(os) | |
2009 | { } | |
2010 | ||
2011 | // Return whether to place an orphan section after this one. | |
2012 | bool | |
2d924fd9 | 2013 | place_orphan_here(const Output_section *os, bool* exact, bool*) const; |
a445fddf ILT |
2014 | |
2015 | // Set section addresses. | |
2016 | void | |
fd247bfe | 2017 | set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*); |
a445fddf | 2018 | |
1c4f3631 | 2019 | // Get the list of segments to use for an allocated section when |
2cefc357 | 2020 | // using a PHDRS clause. |
1c4f3631 | 2021 | Output_section* |
2cefc357 | 2022 | allocate_to_segment(String_list**, bool*); |
1c4f3631 | 2023 | |
2d924fd9 ILT |
2024 | // Return the associated Output_section. |
2025 | Output_section* | |
2026 | get_output_section() const | |
2027 | { return this->os_; } | |
2028 | ||
a445fddf ILT |
2029 | // Print for debugging. |
2030 | void | |
2031 | print(FILE* f) const | |
2032 | { | |
2033 | fprintf(f, " marker for orphaned output section %s\n", | |
2034 | this->os_->name()); | |
2035 | } | |
2036 | ||
2037 | private: | |
2038 | Output_section* os_; | |
2039 | }; | |
2040 | ||
2041 | // Whether to place another orphan section after this one. | |
2042 | ||
2043 | bool | |
2044 | Orphan_output_section::place_orphan_here(const Output_section* os, | |
2d924fd9 ILT |
2045 | bool* exact, |
2046 | bool* is_relro) const | |
a445fddf ILT |
2047 | { |
2048 | if (this->os_->type() == os->type() | |
2049 | && this->os_->flags() == os->flags()) | |
2050 | { | |
2051 | *exact = true; | |
2d924fd9 | 2052 | *is_relro = this->os_->is_relro(); |
a445fddf ILT |
2053 | return true; |
2054 | } | |
2055 | return false; | |
2056 | } | |
2057 | ||
2058 | // Set section addresses. | |
2059 | ||
2060 | void | |
2061 | Orphan_output_section::set_section_addresses(Symbol_table*, Layout*, | |
fd247bfe ILT |
2062 | uint64_t* dot_value, |
2063 | uint64_t* load_address) | |
a445fddf ILT |
2064 | { |
2065 | typedef std::list<std::pair<Relobj*, unsigned int> > Input_section_list; | |
2066 | ||
fd247bfe ILT |
2067 | bool have_load_address = *load_address != *dot_value; |
2068 | ||
a445fddf ILT |
2069 | uint64_t address = *dot_value; |
2070 | address = align_address(address, this->os_->addralign()); | |
2071 | ||
2072 | if ((this->os_->flags() & elfcpp::SHF_ALLOC) != 0) | |
fd247bfe ILT |
2073 | { |
2074 | this->os_->set_address(address); | |
2075 | if (have_load_address) | |
2076 | this->os_->set_load_address(align_address(*load_address, | |
2077 | this->os_->addralign())); | |
2078 | } | |
a445fddf ILT |
2079 | |
2080 | Input_section_list input_sections; | |
2081 | address += this->os_->get_input_sections(address, "", &input_sections); | |
2082 | ||
2083 | for (Input_section_list::iterator p = input_sections.begin(); | |
2084 | p != input_sections.end(); | |
2085 | ++p) | |
2086 | { | |
2087 | uint64_t addralign; | |
2088 | uint64_t size; | |
2089 | ||
2090 | // We know what are single-threaded, so it is OK to lock the | |
2091 | // object. | |
2092 | { | |
2093 | const Task* task = reinterpret_cast<const Task*>(-1); | |
2094 | Task_lock_obj<Object> tl(task, p->first); | |
2095 | addralign = p->first->section_addralign(p->second); | |
2096 | size = p->first->section_size(p->second); | |
2097 | } | |
2098 | ||
2099 | address = align_address(address, addralign); | |
0e43bb4e ILT |
2100 | this->os_->add_input_section_for_script(p->first, p->second, size, |
2101 | addralign); | |
a445fddf ILT |
2102 | address += size; |
2103 | } | |
2104 | ||
fd247bfe ILT |
2105 | if (!have_load_address) |
2106 | *load_address = address; | |
2107 | else | |
2108 | *load_address += address - *dot_value; | |
2109 | ||
a445fddf ILT |
2110 | *dot_value = address; |
2111 | } | |
2112 | ||
1c4f3631 ILT |
2113 | // Get the list of segments to use for an allocated section when using |
2114 | // a PHDRS clause. If this is an allocated section, return the | |
2115 | // Output_section. We don't change the list of segments. | |
2116 | ||
2117 | Output_section* | |
2cefc357 | 2118 | Orphan_output_section::allocate_to_segment(String_list**, bool* orphan) |
1c4f3631 ILT |
2119 | { |
2120 | if ((this->os_->flags() & elfcpp::SHF_ALLOC) == 0) | |
2121 | return NULL; | |
2cefc357 | 2122 | *orphan = true; |
1c4f3631 ILT |
2123 | return this->os_; |
2124 | } | |
2125 | ||
2126 | // Class Phdrs_element. A program header from a PHDRS clause. | |
2127 | ||
2128 | class Phdrs_element | |
2129 | { | |
2130 | public: | |
2131 | Phdrs_element(const char* name, size_t namelen, unsigned int type, | |
2132 | bool includes_filehdr, bool includes_phdrs, | |
2133 | bool is_flags_valid, unsigned int flags, | |
2134 | Expression* load_address) | |
2135 | : name_(name, namelen), type_(type), includes_filehdr_(includes_filehdr), | |
2136 | includes_phdrs_(includes_phdrs), is_flags_valid_(is_flags_valid), | |
2137 | flags_(flags), load_address_(load_address), load_address_value_(0), | |
2138 | segment_(NULL) | |
2139 | { } | |
2140 | ||
2141 | // Return the name of this segment. | |
2142 | const std::string& | |
2143 | name() const | |
2144 | { return this->name_; } | |
2145 | ||
2146 | // Return the type of the segment. | |
2147 | unsigned int | |
2148 | type() const | |
2149 | { return this->type_; } | |
2150 | ||
2151 | // Whether to include the file header. | |
2152 | bool | |
2153 | includes_filehdr() const | |
2154 | { return this->includes_filehdr_; } | |
2155 | ||
2156 | // Whether to include the program headers. | |
2157 | bool | |
2158 | includes_phdrs() const | |
2159 | { return this->includes_phdrs_; } | |
2160 | ||
2161 | // Return whether there is a load address. | |
2162 | bool | |
2163 | has_load_address() const | |
2164 | { return this->load_address_ != NULL; } | |
2165 | ||
2166 | // Evaluate the load address expression if there is one. | |
2167 | void | |
2168 | eval_load_address(Symbol_table* symtab, Layout* layout) | |
2169 | { | |
2170 | if (this->load_address_ != NULL) | |
919ed24c ILT |
2171 | this->load_address_value_ = this->load_address_->eval(symtab, layout, |
2172 | true); | |
1c4f3631 ILT |
2173 | } |
2174 | ||
2175 | // Return the load address. | |
2176 | uint64_t | |
2177 | load_address() const | |
2178 | { | |
2179 | gold_assert(this->load_address_ != NULL); | |
2180 | return this->load_address_value_; | |
2181 | } | |
2182 | ||
2183 | // Create the segment. | |
2184 | Output_segment* | |
2185 | create_segment(Layout* layout) | |
2186 | { | |
2187 | this->segment_ = layout->make_output_segment(this->type_, this->flags_); | |
2188 | return this->segment_; | |
2189 | } | |
2190 | ||
2191 | // Return the segment. | |
2192 | Output_segment* | |
2193 | segment() | |
2194 | { return this->segment_; } | |
2195 | ||
2196 | // Set the segment flags if appropriate. | |
2197 | void | |
2198 | set_flags_if_valid() | |
2199 | { | |
2200 | if (this->is_flags_valid_) | |
2201 | this->segment_->set_flags(this->flags_); | |
2202 | } | |
2203 | ||
7d26c6cc ILT |
2204 | // Print for debugging. |
2205 | void | |
2206 | print(FILE*) const; | |
2207 | ||
1c4f3631 ILT |
2208 | private: |
2209 | // The name used in the script. | |
2210 | std::string name_; | |
2211 | // The type of the segment (PT_LOAD, etc.). | |
2212 | unsigned int type_; | |
2213 | // Whether this segment includes the file header. | |
2214 | bool includes_filehdr_; | |
2215 | // Whether this segment includes the section headers. | |
2216 | bool includes_phdrs_; | |
2217 | // Whether the flags were explicitly specified. | |
2218 | bool is_flags_valid_; | |
2219 | // The flags for this segment (PF_R, etc.) if specified. | |
2220 | unsigned int flags_; | |
2221 | // The expression for the load address for this segment. This may | |
2222 | // be NULL. | |
2223 | Expression* load_address_; | |
2224 | // The actual load address from evaluating the expression. | |
2225 | uint64_t load_address_value_; | |
2226 | // The segment itself. | |
2227 | Output_segment* segment_; | |
2228 | }; | |
2229 | ||
7d26c6cc ILT |
2230 | // Print for debugging. |
2231 | ||
2232 | void | |
2233 | Phdrs_element::print(FILE* f) const | |
2234 | { | |
2235 | fprintf(f, " %s 0x%x", this->name_.c_str(), this->type_); | |
2236 | if (this->includes_filehdr_) | |
2237 | fprintf(f, " FILEHDR"); | |
2238 | if (this->includes_phdrs_) | |
2239 | fprintf(f, " PHDRS"); | |
2240 | if (this->is_flags_valid_) | |
2241 | fprintf(f, " FLAGS(%u)", this->flags_); | |
2242 | if (this->load_address_ != NULL) | |
2243 | { | |
2244 | fprintf(f, " AT("); | |
2245 | this->load_address_->print(f); | |
2246 | fprintf(f, ")"); | |
2247 | } | |
2248 | fprintf(f, ";\n"); | |
2249 | } | |
2250 | ||
494e05f4 ILT |
2251 | // Class Script_sections. |
2252 | ||
2253 | Script_sections::Script_sections() | |
2254 | : saw_sections_clause_(false), | |
2255 | in_sections_clause_(false), | |
2256 | sections_elements_(NULL), | |
1c4f3631 | 2257 | output_section_(NULL), |
2d924fd9 ILT |
2258 | phdrs_elements_(NULL), |
2259 | data_segment_align_index_(-1U), | |
2260 | saw_relro_end_(false) | |
494e05f4 ILT |
2261 | { |
2262 | } | |
2263 | ||
2264 | // Start a SECTIONS clause. | |
2265 | ||
2266 | void | |
2267 | Script_sections::start_sections() | |
2268 | { | |
2269 | gold_assert(!this->in_sections_clause_ && this->output_section_ == NULL); | |
2270 | this->saw_sections_clause_ = true; | |
2271 | this->in_sections_clause_ = true; | |
2272 | if (this->sections_elements_ == NULL) | |
2273 | this->sections_elements_ = new Sections_elements; | |
2274 | } | |
2275 | ||
2276 | // Finish a SECTIONS clause. | |
2277 | ||
2278 | void | |
2279 | Script_sections::finish_sections() | |
2280 | { | |
2281 | gold_assert(this->in_sections_clause_ && this->output_section_ == NULL); | |
2282 | this->in_sections_clause_ = false; | |
2283 | } | |
2284 | ||
2285 | // Add a symbol to be defined. | |
2286 | ||
2287 | void | |
2288 | Script_sections::add_symbol_assignment(const char* name, size_t length, | |
2289 | Expression* val, bool provide, | |
2290 | bool hidden) | |
2291 | { | |
2292 | if (this->output_section_ != NULL) | |
2293 | this->output_section_->add_symbol_assignment(name, length, val, | |
2294 | provide, hidden); | |
2295 | else | |
2296 | { | |
2297 | Sections_element* p = new Sections_element_assignment(name, length, | |
2298 | val, provide, | |
2299 | hidden); | |
2300 | this->sections_elements_->push_back(p); | |
2301 | } | |
2302 | } | |
2303 | ||
a445fddf ILT |
2304 | // Add an assignment to the special dot symbol. |
2305 | ||
2306 | void | |
2307 | Script_sections::add_dot_assignment(Expression* val) | |
2308 | { | |
2309 | if (this->output_section_ != NULL) | |
2310 | this->output_section_->add_dot_assignment(val); | |
2311 | else | |
2312 | { | |
2313 | Sections_element* p = new Sections_element_dot_assignment(val); | |
2314 | this->sections_elements_->push_back(p); | |
2315 | } | |
2316 | } | |
2317 | ||
494e05f4 ILT |
2318 | // Add an assertion. |
2319 | ||
2320 | void | |
2321 | Script_sections::add_assertion(Expression* check, const char* message, | |
2322 | size_t messagelen) | |
2323 | { | |
2324 | if (this->output_section_ != NULL) | |
2325 | this->output_section_->add_assertion(check, message, messagelen); | |
2326 | else | |
2327 | { | |
2328 | Sections_element* p = new Sections_element_assertion(check, message, | |
2329 | messagelen); | |
2330 | this->sections_elements_->push_back(p); | |
2331 | } | |
2332 | } | |
2333 | ||
2334 | // Start processing entries for an output section. | |
2335 | ||
2336 | void | |
2337 | Script_sections::start_output_section( | |
2338 | const char* name, | |
2339 | size_t namelen, | |
2340 | const Parser_output_section_header *header) | |
2341 | { | |
2342 | Output_section_definition* posd = new Output_section_definition(name, | |
2343 | namelen, | |
2344 | header); | |
2345 | this->sections_elements_->push_back(posd); | |
2346 | gold_assert(this->output_section_ == NULL); | |
2347 | this->output_section_ = posd; | |
2348 | } | |
2349 | ||
2350 | // Stop processing entries for an output section. | |
2351 | ||
2352 | void | |
2353 | Script_sections::finish_output_section( | |
2354 | const Parser_output_section_trailer* trailer) | |
2355 | { | |
2356 | gold_assert(this->output_section_ != NULL); | |
2357 | this->output_section_->finish(trailer); | |
2358 | this->output_section_ = NULL; | |
2359 | } | |
2360 | ||
2361 | // Add a data item to the current output section. | |
2362 | ||
2363 | void | |
2364 | Script_sections::add_data(int size, bool is_signed, Expression* val) | |
2365 | { | |
2366 | gold_assert(this->output_section_ != NULL); | |
2367 | this->output_section_->add_data(size, is_signed, val); | |
2368 | } | |
2369 | ||
2370 | // Add a fill value setting to the current output section. | |
2371 | ||
2372 | void | |
2373 | Script_sections::add_fill(Expression* val) | |
2374 | { | |
2375 | gold_assert(this->output_section_ != NULL); | |
2376 | this->output_section_->add_fill(val); | |
2377 | } | |
2378 | ||
2379 | // Add an input section specification to the current output section. | |
2380 | ||
2381 | void | |
2382 | Script_sections::add_input_section(const Input_section_spec* spec, bool keep) | |
2383 | { | |
2384 | gold_assert(this->output_section_ != NULL); | |
2385 | this->output_section_->add_input_section(spec, keep); | |
2386 | } | |
2387 | ||
2d924fd9 ILT |
2388 | // This is called when we see DATA_SEGMENT_ALIGN. It means that any |
2389 | // subsequent output sections may be relro. | |
2390 | ||
2391 | void | |
2392 | Script_sections::data_segment_align() | |
2393 | { | |
2394 | if (this->data_segment_align_index_ != -1U) | |
2395 | gold_error(_("DATA_SEGMENT_ALIGN may only appear once in a linker script")); | |
2396 | this->data_segment_align_index_ = this->sections_elements_->size(); | |
2397 | } | |
2398 | ||
2399 | // This is called when we see DATA_SEGMENT_RELRO_END. It means that | |
2400 | // any output sections seen since DATA_SEGMENT_ALIGN are relro. | |
2401 | ||
2402 | void | |
2403 | Script_sections::data_segment_relro_end() | |
2404 | { | |
2405 | if (this->saw_relro_end_) | |
2406 | gold_error(_("DATA_SEGMENT_RELRO_END may only appear once " | |
2407 | "in a linker script")); | |
2408 | this->saw_relro_end_ = true; | |
2409 | ||
2410 | if (this->data_segment_align_index_ == -1U) | |
2411 | gold_error(_("DATA_SEGMENT_RELRO_END must follow DATA_SEGMENT_ALIGN")); | |
2412 | else | |
2413 | { | |
2414 | for (size_t i = this->data_segment_align_index_; | |
2415 | i < this->sections_elements_->size(); | |
2416 | ++i) | |
2417 | (*this->sections_elements_)[i]->set_is_relro(); | |
2418 | } | |
2419 | } | |
2420 | ||
919ed24c ILT |
2421 | // Create any required sections. |
2422 | ||
2423 | void | |
2424 | Script_sections::create_sections(Layout* layout) | |
2425 | { | |
2426 | if (!this->saw_sections_clause_) | |
2427 | return; | |
2428 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2429 | p != this->sections_elements_->end(); | |
2430 | ++p) | |
2431 | (*p)->create_sections(layout); | |
2432 | } | |
2433 | ||
a445fddf ILT |
2434 | // Add any symbols we are defining to the symbol table. |
2435 | ||
2436 | void | |
2437 | Script_sections::add_symbols_to_table(Symbol_table* symtab) | |
2438 | { | |
2439 | if (!this->saw_sections_clause_) | |
2440 | return; | |
2441 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2442 | p != this->sections_elements_->end(); | |
2443 | ++p) | |
2444 | (*p)->add_symbols_to_table(symtab); | |
2445 | } | |
2446 | ||
2447 | // Finalize symbols and check assertions. | |
2448 | ||
2449 | void | |
2450 | Script_sections::finalize_symbols(Symbol_table* symtab, const Layout* layout) | |
2451 | { | |
2452 | if (!this->saw_sections_clause_) | |
2453 | return; | |
a445fddf ILT |
2454 | uint64_t dot_value = 0; |
2455 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2456 | p != this->sections_elements_->end(); | |
2457 | ++p) | |
77e65537 | 2458 | (*p)->finalize_symbols(symtab, layout, &dot_value); |
a445fddf ILT |
2459 | } |
2460 | ||
2461 | // Return the name of the output section to use for an input file name | |
2462 | // and section name. | |
2463 | ||
2464 | const char* | |
2465 | Script_sections::output_section_name(const char* file_name, | |
2466 | const char* section_name, | |
2467 | Output_section*** output_section_slot) | |
2468 | { | |
2469 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
2470 | p != this->sections_elements_->end(); | |
2471 | ++p) | |
2472 | { | |
2473 | const char* ret = (*p)->output_section_name(file_name, section_name, | |
2474 | output_section_slot); | |
2475 | ||
2476 | if (ret != NULL) | |
2477 | { | |
2478 | // The special name /DISCARD/ means that the input section | |
2479 | // should be discarded. | |
2480 | if (strcmp(ret, "/DISCARD/") == 0) | |
2481 | { | |
2482 | *output_section_slot = NULL; | |
2483 | return NULL; | |
2484 | } | |
2485 | return ret; | |
2486 | } | |
2487 | } | |
2488 | ||
2489 | // If we couldn't find a mapping for the name, the output section | |
2490 | // gets the name of the input section. | |
2491 | ||
2492 | *output_section_slot = NULL; | |
2493 | ||
2494 | return section_name; | |
2495 | } | |
2496 | ||
2497 | // Place a marker for an orphan output section into the SECTIONS | |
2498 | // clause. | |
2499 | ||
2500 | void | |
2501 | Script_sections::place_orphan(Output_section* os) | |
2502 | { | |
2503 | // Look for an output section definition which matches the output | |
2504 | // section. Put a marker after that section. | |
2d924fd9 | 2505 | bool is_relro = false; |
a445fddf ILT |
2506 | Sections_elements::iterator place = this->sections_elements_->end(); |
2507 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2508 | p != this->sections_elements_->end(); | |
2509 | ++p) | |
2510 | { | |
c42e122e | 2511 | bool exact = false; |
2d924fd9 ILT |
2512 | bool is_relro_here; |
2513 | if ((*p)->place_orphan_here(os, &exact, &is_relro_here)) | |
a445fddf ILT |
2514 | { |
2515 | place = p; | |
2d924fd9 | 2516 | is_relro = is_relro_here; |
a445fddf ILT |
2517 | if (exact) |
2518 | break; | |
2519 | } | |
2520 | } | |
2521 | ||
2522 | // The insert function puts the new element before the iterator. | |
2523 | if (place != this->sections_elements_->end()) | |
2524 | ++place; | |
2525 | ||
2526 | this->sections_elements_->insert(place, new Orphan_output_section(os)); | |
2d924fd9 ILT |
2527 | |
2528 | if (is_relro) | |
2529 | os->set_is_relro(); | |
2530 | else | |
2531 | os->clear_is_relro(); | |
a445fddf ILT |
2532 | } |
2533 | ||
2534 | // Set the addresses of all the output sections. Walk through all the | |
2535 | // elements, tracking the dot symbol. Apply assignments which set | |
2536 | // absolute symbol values, in case they are used when setting dot. | |
2537 | // Fill in data statement values. As we find output sections, set the | |
2538 | // address, set the address of all associated input sections, and | |
2539 | // update dot. Return the segment which should hold the file header | |
2540 | // and segment headers, if any. | |
2541 | ||
2542 | Output_segment* | |
2543 | Script_sections::set_section_addresses(Symbol_table* symtab, Layout* layout) | |
2544 | { | |
2545 | gold_assert(this->saw_sections_clause_); | |
2546 | ||
3802b2dd ILT |
2547 | // Implement ONLY_IF_RO/ONLY_IF_RW constraints. These are a pain |
2548 | // for our representation. | |
2549 | for (Sections_elements::iterator p = this->sections_elements_->begin(); | |
2550 | p != this->sections_elements_->end(); | |
2551 | ++p) | |
2552 | { | |
2553 | Output_section_definition* posd; | |
2554 | Section_constraint failed_constraint = (*p)->check_constraint(&posd); | |
2555 | if (failed_constraint != CONSTRAINT_NONE) | |
2556 | { | |
2557 | Sections_elements::iterator q; | |
2558 | for (q = this->sections_elements_->begin(); | |
2559 | q != this->sections_elements_->end(); | |
2560 | ++q) | |
2561 | { | |
2562 | if (q != p) | |
2563 | { | |
2564 | if ((*q)->alternate_constraint(posd, failed_constraint)) | |
2565 | break; | |
2566 | } | |
2567 | } | |
2568 | ||
2569 | if (q == this->sections_elements_->end()) | |
2570 | gold_error(_("no matching section constraint")); | |
2571 | } | |
2572 | } | |
2573 | ||
2d924fd9 ILT |
2574 | // Force the alignment of the first TLS section to be the maximum |
2575 | // alignment of all TLS sections. | |
2576 | Output_section* first_tls = NULL; | |
2577 | uint64_t tls_align = 0; | |
2578 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
2579 | p != this->sections_elements_->end(); | |
2580 | ++p) | |
2581 | { | |
2582 | Output_section *os = (*p)->get_output_section(); | |
2583 | if (os != NULL && (os->flags() & elfcpp::SHF_TLS) != 0) | |
2584 | { | |
2585 | if (first_tls == NULL) | |
2586 | first_tls = os; | |
2587 | if (os->addralign() > tls_align) | |
2588 | tls_align = os->addralign(); | |
2589 | } | |
2590 | } | |
2591 | if (first_tls != NULL) | |
2592 | first_tls->set_addralign(tls_align); | |
2593 | ||
77e65537 | 2594 | // For a relocatable link, we implicitly set dot to zero. |
a445fddf | 2595 | uint64_t dot_value = 0; |
fd247bfe | 2596 | uint64_t load_address = 0; |
a445fddf ILT |
2597 | for (Sections_elements::iterator p = this->sections_elements_->begin(); |
2598 | p != this->sections_elements_->end(); | |
2599 | ++p) | |
fd247bfe | 2600 | (*p)->set_section_addresses(symtab, layout, &dot_value, &load_address); |
a445fddf | 2601 | |
1c4f3631 ILT |
2602 | if (this->phdrs_elements_ != NULL) |
2603 | { | |
2604 | for (Phdrs_elements::iterator p = this->phdrs_elements_->begin(); | |
2605 | p != this->phdrs_elements_->end(); | |
2606 | ++p) | |
2607 | (*p)->eval_load_address(symtab, layout); | |
2608 | } | |
2609 | ||
a445fddf ILT |
2610 | return this->create_segments(layout); |
2611 | } | |
2612 | ||
2613 | // Sort the sections in order to put them into segments. | |
2614 | ||
2615 | class Sort_output_sections | |
2616 | { | |
2617 | public: | |
2618 | bool | |
2619 | operator()(const Output_section* os1, const Output_section* os2) const; | |
2620 | }; | |
2621 | ||
2622 | bool | |
2623 | Sort_output_sections::operator()(const Output_section* os1, | |
2624 | const Output_section* os2) const | |
2625 | { | |
2626 | // Sort first by the load address. | |
2627 | uint64_t lma1 = (os1->has_load_address() | |
2628 | ? os1->load_address() | |
2629 | : os1->address()); | |
2630 | uint64_t lma2 = (os2->has_load_address() | |
2631 | ? os2->load_address() | |
2632 | : os2->address()); | |
2633 | if (lma1 != lma2) | |
2634 | return lma1 < lma2; | |
2635 | ||
2636 | // Then sort by the virtual address. | |
2637 | if (os1->address() != os2->address()) | |
2638 | return os1->address() < os2->address(); | |
2639 | ||
2640 | // Sort TLS sections to the end. | |
2641 | bool tls1 = (os1->flags() & elfcpp::SHF_TLS) != 0; | |
2642 | bool tls2 = (os2->flags() & elfcpp::SHF_TLS) != 0; | |
2643 | if (tls1 != tls2) | |
2644 | return tls2; | |
2645 | ||
2646 | // Sort PROGBITS before NOBITS. | |
2647 | if (os1->type() == elfcpp::SHT_PROGBITS && os2->type() == elfcpp::SHT_NOBITS) | |
2648 | return true; | |
2649 | if (os1->type() == elfcpp::SHT_NOBITS && os2->type() == elfcpp::SHT_PROGBITS) | |
2650 | return false; | |
2651 | ||
2652 | // Otherwise we don't care. | |
2653 | return false; | |
2654 | } | |
2655 | ||
2656 | // Return whether OS is a BSS section. This is a SHT_NOBITS section. | |
2657 | // We treat a section with the SHF_TLS flag set as taking up space | |
2658 | // even if it is SHT_NOBITS (this is true of .tbss), as we allocate | |
2659 | // space for them in the file. | |
2660 | ||
2661 | bool | |
2662 | Script_sections::is_bss_section(const Output_section* os) | |
2663 | { | |
2664 | return (os->type() == elfcpp::SHT_NOBITS | |
2665 | && (os->flags() & elfcpp::SHF_TLS) == 0); | |
2666 | } | |
2667 | ||
1c4f3631 ILT |
2668 | // Return the size taken by the file header and the program headers. |
2669 | ||
2670 | size_t | |
2671 | Script_sections::total_header_size(Layout* layout) const | |
2672 | { | |
2673 | size_t segment_count = layout->segment_count(); | |
2674 | size_t file_header_size; | |
2675 | size_t segment_headers_size; | |
8851ecca | 2676 | if (parameters->target().get_size() == 32) |
1c4f3631 ILT |
2677 | { |
2678 | file_header_size = elfcpp::Elf_sizes<32>::ehdr_size; | |
2679 | segment_headers_size = segment_count * elfcpp::Elf_sizes<32>::phdr_size; | |
2680 | } | |
8851ecca | 2681 | else if (parameters->target().get_size() == 64) |
1c4f3631 ILT |
2682 | { |
2683 | file_header_size = elfcpp::Elf_sizes<64>::ehdr_size; | |
2684 | segment_headers_size = segment_count * elfcpp::Elf_sizes<64>::phdr_size; | |
2685 | } | |
2686 | else | |
2687 | gold_unreachable(); | |
2688 | ||
2689 | return file_header_size + segment_headers_size; | |
2690 | } | |
2691 | ||
2692 | // Return the amount we have to subtract from the LMA to accomodate | |
2693 | // headers of the given size. The complication is that the file | |
2694 | // header have to be at the start of a page, as otherwise it will not | |
2695 | // be at the start of the file. | |
2696 | ||
2697 | uint64_t | |
2698 | Script_sections::header_size_adjustment(uint64_t lma, | |
2699 | size_t sizeof_headers) const | |
2700 | { | |
8851ecca | 2701 | const uint64_t abi_pagesize = parameters->target().abi_pagesize(); |
1c4f3631 ILT |
2702 | uint64_t hdr_lma = lma - sizeof_headers; |
2703 | hdr_lma &= ~(abi_pagesize - 1); | |
2704 | return lma - hdr_lma; | |
2705 | } | |
2706 | ||
a445fddf ILT |
2707 | // Create the PT_LOAD segments when using a SECTIONS clause. Returns |
2708 | // the segment which should hold the file header and segment headers, | |
2709 | // if any. | |
2710 | ||
2711 | Output_segment* | |
2712 | Script_sections::create_segments(Layout* layout) | |
2713 | { | |
2714 | gold_assert(this->saw_sections_clause_); | |
2715 | ||
8851ecca | 2716 | if (parameters->options().relocatable()) |
a445fddf ILT |
2717 | return NULL; |
2718 | ||
1c4f3631 ILT |
2719 | if (this->saw_phdrs_clause()) |
2720 | return create_segments_from_phdrs_clause(layout); | |
2721 | ||
a445fddf ILT |
2722 | Layout::Section_list sections; |
2723 | layout->get_allocated_sections(§ions); | |
2724 | ||
2725 | // Sort the sections by address. | |
2726 | std::stable_sort(sections.begin(), sections.end(), Sort_output_sections()); | |
2727 | ||
2728 | this->create_note_and_tls_segments(layout, §ions); | |
2729 | ||
2730 | // Walk through the sections adding them to PT_LOAD segments. | |
8851ecca | 2731 | const uint64_t abi_pagesize = parameters->target().abi_pagesize(); |
a445fddf ILT |
2732 | Output_segment* first_seg = NULL; |
2733 | Output_segment* current_seg = NULL; | |
2734 | bool is_current_seg_readonly = true; | |
2735 | Layout::Section_list::iterator plast = sections.end(); | |
2736 | uint64_t last_vma = 0; | |
2737 | uint64_t last_lma = 0; | |
2738 | uint64_t last_size = 0; | |
2739 | for (Layout::Section_list::iterator p = sections.begin(); | |
2740 | p != sections.end(); | |
2741 | ++p) | |
2742 | { | |
2743 | const uint64_t vma = (*p)->address(); | |
2744 | const uint64_t lma = ((*p)->has_load_address() | |
2745 | ? (*p)->load_address() | |
2746 | : vma); | |
2747 | const uint64_t size = (*p)->current_data_size(); | |
2748 | ||
2749 | bool need_new_segment; | |
2750 | if (current_seg == NULL) | |
2751 | need_new_segment = true; | |
2752 | else if (lma - vma != last_lma - last_vma) | |
2753 | { | |
2754 | // This section has a different LMA relationship than the | |
2755 | // last one; we need a new segment. | |
2756 | need_new_segment = true; | |
2757 | } | |
2758 | else if (align_address(last_lma + last_size, abi_pagesize) | |
2759 | < align_address(lma, abi_pagesize)) | |
2760 | { | |
2761 | // Putting this section in the segment would require | |
2762 | // skipping a page. | |
2763 | need_new_segment = true; | |
2764 | } | |
2765 | else if (is_bss_section(*plast) && !is_bss_section(*p)) | |
2766 | { | |
2767 | // A non-BSS section can not follow a BSS section in the | |
2768 | // same segment. | |
2769 | need_new_segment = true; | |
2770 | } | |
2771 | else if (is_current_seg_readonly | |
af6156ef ILT |
2772 | && ((*p)->flags() & elfcpp::SHF_WRITE) != 0 |
2773 | && !parameters->options().omagic()) | |
a445fddf ILT |
2774 | { |
2775 | // Don't put a writable section in the same segment as a | |
2776 | // non-writable section. | |
2777 | need_new_segment = true; | |
2778 | } | |
2779 | else | |
2780 | { | |
2781 | // Otherwise, reuse the existing segment. | |
2782 | need_new_segment = false; | |
2783 | } | |
2784 | ||
2785 | elfcpp::Elf_Word seg_flags = | |
2786 | Layout::section_flags_to_segment((*p)->flags()); | |
2787 | ||
2788 | if (need_new_segment) | |
2789 | { | |
2790 | current_seg = layout->make_output_segment(elfcpp::PT_LOAD, | |
2791 | seg_flags); | |
2792 | current_seg->set_addresses(vma, lma); | |
2793 | if (first_seg == NULL) | |
2794 | first_seg = current_seg; | |
2795 | is_current_seg_readonly = true; | |
2796 | } | |
2797 | ||
2798 | current_seg->add_output_section(*p, seg_flags); | |
2799 | ||
2800 | if (((*p)->flags() & elfcpp::SHF_WRITE) != 0) | |
2801 | is_current_seg_readonly = false; | |
2802 | ||
2803 | plast = p; | |
2804 | last_vma = vma; | |
2805 | last_lma = lma; | |
2806 | last_size = size; | |
2807 | } | |
2808 | ||
2809 | // An ELF program should work even if the program headers are not in | |
2810 | // a PT_LOAD segment. However, it appears that the Linux kernel | |
2811 | // does not set the AT_PHDR auxiliary entry in that case. It sets | |
2812 | // the load address to p_vaddr - p_offset of the first PT_LOAD | |
2813 | // segment. It then sets AT_PHDR to the load address plus the | |
2814 | // offset to the program headers, e_phoff in the file header. This | |
2815 | // fails when the program headers appear in the file before the | |
2816 | // first PT_LOAD segment. Therefore, we always create a PT_LOAD | |
2817 | // segment to hold the file header and the program headers. This is | |
2818 | // effectively what the GNU linker does, and it is slightly more | |
2819 | // efficient in any case. We try to use the first PT_LOAD segment | |
2820 | // if we can, otherwise we make a new one. | |
2821 | ||
919ed24c ILT |
2822 | if (first_seg == NULL) |
2823 | return NULL; | |
2824 | ||
1c4f3631 | 2825 | size_t sizeof_headers = this->total_header_size(layout); |
3802b2dd | 2826 | |
919ed24c ILT |
2827 | uint64_t vma = first_seg->vaddr(); |
2828 | uint64_t lma = first_seg->paddr(); | |
2829 | ||
2830 | uint64_t subtract = this->header_size_adjustment(lma, sizeof_headers); | |
2831 | ||
e6188289 ILT |
2832 | if ((lma & (abi_pagesize - 1)) >= sizeof_headers) |
2833 | { | |
2834 | first_seg->set_addresses(vma - subtract, lma - subtract); | |
2835 | return first_seg; | |
2836 | } | |
2837 | ||
919ed24c ILT |
2838 | // If there is no room to squeeze in the headers, then punt. The |
2839 | // resulting executable probably won't run on GNU/Linux, but we | |
2840 | // trust that the user knows what they are doing. | |
2841 | if (lma < subtract || vma < subtract) | |
2842 | return NULL; | |
2843 | ||
a445fddf ILT |
2844 | Output_segment* load_seg = layout->make_output_segment(elfcpp::PT_LOAD, |
2845 | elfcpp::PF_R); | |
919ed24c | 2846 | load_seg->set_addresses(vma - subtract, lma - subtract); |
a445fddf ILT |
2847 | |
2848 | return load_seg; | |
2849 | } | |
2850 | ||
2851 | // Create a PT_NOTE segment for each SHT_NOTE section and a PT_TLS | |
2852 | // segment if there are any SHT_TLS sections. | |
2853 | ||
2854 | void | |
2855 | Script_sections::create_note_and_tls_segments( | |
2856 | Layout* layout, | |
2857 | const Layout::Section_list* sections) | |
2858 | { | |
1c4f3631 ILT |
2859 | gold_assert(!this->saw_phdrs_clause()); |
2860 | ||
a445fddf ILT |
2861 | bool saw_tls = false; |
2862 | for (Layout::Section_list::const_iterator p = sections->begin(); | |
2863 | p != sections->end(); | |
2864 | ++p) | |
2865 | { | |
2866 | if ((*p)->type() == elfcpp::SHT_NOTE) | |
2867 | { | |
2868 | elfcpp::Elf_Word seg_flags = | |
2869 | Layout::section_flags_to_segment((*p)->flags()); | |
2870 | Output_segment* oseg = layout->make_output_segment(elfcpp::PT_NOTE, | |
2871 | seg_flags); | |
2872 | oseg->add_output_section(*p, seg_flags); | |
2873 | ||
2874 | // Incorporate any subsequent SHT_NOTE sections, in the | |
2875 | // hopes that the script is sensible. | |
2876 | Layout::Section_list::const_iterator pnext = p + 1; | |
2877 | while (pnext != sections->end() | |
2878 | && (*pnext)->type() == elfcpp::SHT_NOTE) | |
2879 | { | |
2880 | seg_flags = Layout::section_flags_to_segment((*pnext)->flags()); | |
2881 | oseg->add_output_section(*pnext, seg_flags); | |
2882 | p = pnext; | |
2883 | ++pnext; | |
2884 | } | |
2885 | } | |
2886 | ||
2887 | if (((*p)->flags() & elfcpp::SHF_TLS) != 0) | |
2888 | { | |
2889 | if (saw_tls) | |
2890 | gold_error(_("TLS sections are not adjacent")); | |
2891 | ||
2892 | elfcpp::Elf_Word seg_flags = | |
2893 | Layout::section_flags_to_segment((*p)->flags()); | |
2894 | Output_segment* oseg = layout->make_output_segment(elfcpp::PT_TLS, | |
2895 | seg_flags); | |
2896 | oseg->add_output_section(*p, seg_flags); | |
2897 | ||
2898 | Layout::Section_list::const_iterator pnext = p + 1; | |
2899 | while (pnext != sections->end() | |
2900 | && ((*pnext)->flags() & elfcpp::SHF_TLS) != 0) | |
2901 | { | |
2902 | seg_flags = Layout::section_flags_to_segment((*pnext)->flags()); | |
2903 | oseg->add_output_section(*pnext, seg_flags); | |
2904 | p = pnext; | |
2905 | ++pnext; | |
2906 | } | |
2907 | ||
2908 | saw_tls = true; | |
2909 | } | |
2910 | } | |
2911 | } | |
2912 | ||
1c4f3631 ILT |
2913 | // Add a program header. The PHDRS clause is syntactically distinct |
2914 | // from the SECTIONS clause, but we implement it with the SECTIONS | |
2915 | // support becauase PHDRS is useless if there is no SECTIONS clause. | |
2916 | ||
2917 | void | |
2918 | Script_sections::add_phdr(const char* name, size_t namelen, unsigned int type, | |
2919 | bool includes_filehdr, bool includes_phdrs, | |
2920 | bool is_flags_valid, unsigned int flags, | |
2921 | Expression* load_address) | |
2922 | { | |
2923 | if (this->phdrs_elements_ == NULL) | |
2924 | this->phdrs_elements_ = new Phdrs_elements(); | |
2925 | this->phdrs_elements_->push_back(new Phdrs_element(name, namelen, type, | |
2926 | includes_filehdr, | |
2927 | includes_phdrs, | |
2928 | is_flags_valid, flags, | |
2929 | load_address)); | |
2930 | } | |
2931 | ||
3802b2dd ILT |
2932 | // Return the number of segments we expect to create based on the |
2933 | // SECTIONS clause. This is used to implement SIZEOF_HEADERS. | |
2934 | ||
2935 | size_t | |
2936 | Script_sections::expected_segment_count(const Layout* layout) const | |
2937 | { | |
1c4f3631 ILT |
2938 | if (this->saw_phdrs_clause()) |
2939 | return this->phdrs_elements_->size(); | |
2940 | ||
3802b2dd ILT |
2941 | Layout::Section_list sections; |
2942 | layout->get_allocated_sections(§ions); | |
2943 | ||
2944 | // We assume that we will need two PT_LOAD segments. | |
2945 | size_t ret = 2; | |
2946 | ||
2947 | bool saw_note = false; | |
2948 | bool saw_tls = false; | |
2949 | for (Layout::Section_list::const_iterator p = sections.begin(); | |
2950 | p != sections.end(); | |
2951 | ++p) | |
2952 | { | |
2953 | if ((*p)->type() == elfcpp::SHT_NOTE) | |
2954 | { | |
2955 | // Assume that all note sections will fit into a single | |
2956 | // PT_NOTE segment. | |
2957 | if (!saw_note) | |
2958 | { | |
2959 | ++ret; | |
2960 | saw_note = true; | |
2961 | } | |
2962 | } | |
2963 | else if (((*p)->flags() & elfcpp::SHF_TLS) != 0) | |
2964 | { | |
2965 | // There can only be one PT_TLS segment. | |
2966 | if (!saw_tls) | |
2967 | { | |
2968 | ++ret; | |
2969 | saw_tls = true; | |
2970 | } | |
2971 | } | |
2972 | } | |
2973 | ||
2974 | return ret; | |
2975 | } | |
2976 | ||
1c4f3631 ILT |
2977 | // Create the segments from a PHDRS clause. Return the segment which |
2978 | // should hold the file header and program headers, if any. | |
2979 | ||
2980 | Output_segment* | |
2981 | Script_sections::create_segments_from_phdrs_clause(Layout* layout) | |
2982 | { | |
2983 | this->attach_sections_using_phdrs_clause(layout); | |
2984 | return this->set_phdrs_clause_addresses(layout); | |
2985 | } | |
2986 | ||
2987 | // Create the segments from the PHDRS clause, and put the output | |
2988 | // sections in them. | |
2989 | ||
2990 | void | |
2991 | Script_sections::attach_sections_using_phdrs_clause(Layout* layout) | |
2992 | { | |
2993 | typedef std::map<std::string, Output_segment*> Name_to_segment; | |
2994 | Name_to_segment name_to_segment; | |
2995 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); | |
2996 | p != this->phdrs_elements_->end(); | |
2997 | ++p) | |
2998 | name_to_segment[(*p)->name()] = (*p)->create_segment(layout); | |
2999 | ||
3000 | // Walk through the output sections and attach them to segments. | |
3001 | // Output sections in the script which do not list segments are | |
3002 | // attached to the same set of segments as the immediately preceding | |
3003 | // output section. | |
3004 | String_list* phdr_names = NULL; | |
3005 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
3006 | p != this->sections_elements_->end(); | |
3007 | ++p) | |
3008 | { | |
2cefc357 ILT |
3009 | bool orphan; |
3010 | Output_section* os = (*p)->allocate_to_segment(&phdr_names, &orphan); | |
1c4f3631 ILT |
3011 | if (os == NULL) |
3012 | continue; | |
3013 | ||
3014 | if (phdr_names == NULL) | |
3015 | { | |
3016 | gold_error(_("allocated section not in any segment")); | |
3017 | continue; | |
3018 | } | |
3019 | ||
2cefc357 ILT |
3020 | // If this is an orphan section--one that was not explicitly |
3021 | // mentioned in the linker script--then it should not inherit | |
3022 | // any segment type other than PT_LOAD. Otherwise, e.g., the | |
3023 | // PT_INTERP segment will pick up following orphan sections, | |
3024 | // which does not make sense. If this is not an orphan section, | |
3025 | // we trust the linker script. | |
3026 | if (orphan) | |
3027 | { | |
3028 | String_list::iterator q = phdr_names->begin(); | |
3029 | while (q != phdr_names->end()) | |
3030 | { | |
3031 | Name_to_segment::const_iterator r = name_to_segment.find(*q); | |
3032 | // We give errors about unknown segments below. | |
3033 | if (r == name_to_segment.end() | |
3034 | || r->second->type() == elfcpp::PT_LOAD) | |
3035 | ++q; | |
3036 | else | |
3037 | q = phdr_names->erase(q); | |
3038 | } | |
3039 | } | |
3040 | ||
1c4f3631 ILT |
3041 | bool in_load_segment = false; |
3042 | for (String_list::const_iterator q = phdr_names->begin(); | |
3043 | q != phdr_names->end(); | |
3044 | ++q) | |
3045 | { | |
3046 | Name_to_segment::const_iterator r = name_to_segment.find(*q); | |
3047 | if (r == name_to_segment.end()) | |
3048 | gold_error(_("no segment %s"), q->c_str()); | |
3049 | else | |
3050 | { | |
3051 | elfcpp::Elf_Word seg_flags = | |
3052 | Layout::section_flags_to_segment(os->flags()); | |
3053 | r->second->add_output_section(os, seg_flags); | |
3054 | ||
3055 | if (r->second->type() == elfcpp::PT_LOAD) | |
3056 | { | |
3057 | if (in_load_segment) | |
3058 | gold_error(_("section in two PT_LOAD segments")); | |
3059 | in_load_segment = true; | |
3060 | } | |
3061 | } | |
3062 | } | |
3063 | ||
3064 | if (!in_load_segment) | |
3065 | gold_error(_("allocated section not in any PT_LOAD segment")); | |
3066 | } | |
3067 | } | |
3068 | ||
3069 | // Set the addresses for segments created from a PHDRS clause. Return | |
3070 | // the segment which should hold the file header and program headers, | |
3071 | // if any. | |
3072 | ||
3073 | Output_segment* | |
3074 | Script_sections::set_phdrs_clause_addresses(Layout* layout) | |
3075 | { | |
3076 | Output_segment* load_seg = NULL; | |
3077 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); | |
3078 | p != this->phdrs_elements_->end(); | |
3079 | ++p) | |
3080 | { | |
3081 | // Note that we have to set the flags after adding the output | |
3082 | // sections to the segment, as adding an output segment can | |
3083 | // change the flags. | |
3084 | (*p)->set_flags_if_valid(); | |
3085 | ||
3086 | Output_segment* oseg = (*p)->segment(); | |
3087 | ||
3088 | if (oseg->type() != elfcpp::PT_LOAD) | |
3089 | { | |
3090 | // The addresses of non-PT_LOAD segments are set from the | |
3091 | // PT_LOAD segments. | |
3092 | if ((*p)->has_load_address()) | |
3093 | gold_error(_("may only specify load address for PT_LOAD segment")); | |
3094 | continue; | |
3095 | } | |
3096 | ||
3097 | // The output sections should have addresses from the SECTIONS | |
3098 | // clause. The addresses don't have to be in order, so find the | |
3099 | // one with the lowest load address. Use that to set the | |
3100 | // address of the segment. | |
3101 | ||
3102 | Output_section* osec = oseg->section_with_lowest_load_address(); | |
3103 | if (osec == NULL) | |
3104 | { | |
3105 | oseg->set_addresses(0, 0); | |
3106 | continue; | |
3107 | } | |
3108 | ||
3109 | uint64_t vma = osec->address(); | |
3110 | uint64_t lma = osec->has_load_address() ? osec->load_address() : vma; | |
3111 | ||
3112 | // Override the load address of the section with the load | |
3113 | // address specified for the segment. | |
3114 | if ((*p)->has_load_address()) | |
3115 | { | |
3116 | if (osec->has_load_address()) | |
3117 | gold_warning(_("PHDRS load address overrides " | |
3118 | "section %s load address"), | |
3119 | osec->name()); | |
3120 | ||
3121 | lma = (*p)->load_address(); | |
3122 | } | |
3123 | ||
3124 | bool headers = (*p)->includes_filehdr() && (*p)->includes_phdrs(); | |
3125 | if (!headers && ((*p)->includes_filehdr() || (*p)->includes_phdrs())) | |
3126 | { | |
3127 | // We could support this if we wanted to. | |
3128 | gold_error(_("using only one of FILEHDR and PHDRS is " | |
3129 | "not currently supported")); | |
3130 | } | |
3131 | if (headers) | |
3132 | { | |
3133 | size_t sizeof_headers = this->total_header_size(layout); | |
3134 | uint64_t subtract = this->header_size_adjustment(lma, | |
3135 | sizeof_headers); | |
3136 | if (lma >= subtract && vma >= subtract) | |
3137 | { | |
3138 | lma -= subtract; | |
3139 | vma -= subtract; | |
3140 | } | |
3141 | else | |
3142 | { | |
3143 | gold_error(_("sections loaded on first page without room " | |
3144 | "for file and program headers " | |
3145 | "are not supported")); | |
3146 | } | |
3147 | ||
3148 | if (load_seg != NULL) | |
3149 | gold_error(_("using FILEHDR and PHDRS on more than one " | |
3150 | "PT_LOAD segment is not currently supported")); | |
3151 | load_seg = oseg; | |
3152 | } | |
3153 | ||
3154 | oseg->set_addresses(vma, lma); | |
3155 | } | |
3156 | ||
3157 | return load_seg; | |
3158 | } | |
3159 | ||
3160 | // Add the file header and segment headers to non-load segments | |
3161 | // specified in the PHDRS clause. | |
3162 | ||
3163 | void | |
3164 | Script_sections::put_headers_in_phdrs(Output_data* file_header, | |
3165 | Output_data* segment_headers) | |
3166 | { | |
3167 | gold_assert(this->saw_phdrs_clause()); | |
3168 | for (Phdrs_elements::iterator p = this->phdrs_elements_->begin(); | |
3169 | p != this->phdrs_elements_->end(); | |
3170 | ++p) | |
3171 | { | |
3172 | if ((*p)->type() != elfcpp::PT_LOAD) | |
3173 | { | |
3174 | if ((*p)->includes_phdrs()) | |
3175 | (*p)->segment()->add_initial_output_data(segment_headers); | |
3176 | if ((*p)->includes_filehdr()) | |
3177 | (*p)->segment()->add_initial_output_data(file_header); | |
3178 | } | |
3179 | } | |
3180 | } | |
3181 | ||
8f2eb564 ILT |
3182 | // Look for an output section by name and return the address, the load |
3183 | // address, the alignment, and the size. This is used when an | |
3184 | // expression refers to an output section which was not actually | |
3185 | // created. This returns true if the section was found, false | |
3186 | // otherwise. | |
3187 | ||
3188 | bool | |
3189 | Script_sections::get_output_section_info(const char* name, uint64_t* address, | |
3190 | uint64_t* load_address, | |
3191 | uint64_t* addralign, | |
3192 | uint64_t* size) const | |
3193 | { | |
3194 | if (!this->saw_sections_clause_) | |
3195 | return false; | |
3196 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
3197 | p != this->sections_elements_->end(); | |
3198 | ++p) | |
3199 | if ((*p)->get_output_section_info(name, address, load_address, addralign, | |
3200 | size)) | |
3201 | return true; | |
3202 | return false; | |
3203 | } | |
3204 | ||
494e05f4 ILT |
3205 | // Print the SECTIONS clause to F for debugging. |
3206 | ||
3207 | void | |
3208 | Script_sections::print(FILE* f) const | |
3209 | { | |
3210 | if (!this->saw_sections_clause_) | |
3211 | return; | |
3212 | ||
3213 | fprintf(f, "SECTIONS {\n"); | |
3214 | ||
3215 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); | |
3216 | p != this->sections_elements_->end(); | |
3217 | ++p) | |
3218 | (*p)->print(f); | |
3219 | ||
3220 | fprintf(f, "}\n"); | |
7d26c6cc ILT |
3221 | |
3222 | if (this->phdrs_elements_ != NULL) | |
3223 | { | |
3224 | fprintf(f, "PHDRS {\n"); | |
3225 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); | |
3226 | p != this->phdrs_elements_->end(); | |
3227 | ++p) | |
3228 | (*p)->print(f); | |
3229 | fprintf(f, "}\n"); | |
3230 | } | |
494e05f4 ILT |
3231 | } |
3232 | ||
3233 | } // End namespace gold. |