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