Commit | Line | Data |
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a2fb1b05 ILT |
1 | // layout.cc -- lay out output file sections for gold |
2 | ||
4b95cf5c | 3 | // Copyright (C) 2006-2014 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
a2fb1b05 ILT |
23 | #include "gold.h" |
24 | ||
8ed814a9 | 25 | #include <cerrno> |
a2fb1b05 | 26 | #include <cstring> |
54dc6425 | 27 | #include <algorithm> |
a2fb1b05 | 28 | #include <iostream> |
6e9ba2ca | 29 | #include <fstream> |
a2fb1b05 | 30 | #include <utility> |
8ed814a9 | 31 | #include <fcntl.h> |
6e9ba2ca | 32 | #include <fnmatch.h> |
8ed814a9 ILT |
33 | #include <unistd.h> |
34 | #include "libiberty.h" | |
35 | #include "md5.h" | |
36 | #include "sha1.h" | |
a2fb1b05 | 37 | |
7e1edb90 | 38 | #include "parameters.h" |
14144f39 | 39 | #include "options.h" |
7d9e3d98 | 40 | #include "mapfile.h" |
a445fddf ILT |
41 | #include "script.h" |
42 | #include "script-sections.h" | |
a2fb1b05 | 43 | #include "output.h" |
f6ce93d6 | 44 | #include "symtab.h" |
a3ad94ed | 45 | #include "dynobj.h" |
3151305a | 46 | #include "ehframe.h" |
c1027032 | 47 | #include "gdb-index.h" |
96803768 | 48 | #include "compressed_output.h" |
62b01cb5 | 49 | #include "reduced_debug_output.h" |
487b39df | 50 | #include "object.h" |
6a74a719 | 51 | #include "reloc.h" |
2a00e4fb | 52 | #include "descriptors.h" |
2756a258 | 53 | #include "plugin.h" |
3ce2c28e ILT |
54 | #include "incremental.h" |
55 | #include "layout.h" | |
a2fb1b05 ILT |
56 | |
57 | namespace gold | |
58 | { | |
59 | ||
cdc29364 CC |
60 | // Class Free_list. |
61 | ||
62 | // The total number of free lists used. | |
63 | unsigned int Free_list::num_lists = 0; | |
64 | // The total number of free list nodes used. | |
65 | unsigned int Free_list::num_nodes = 0; | |
66 | // The total number of calls to Free_list::remove. | |
67 | unsigned int Free_list::num_removes = 0; | |
68 | // The total number of nodes visited during calls to Free_list::remove. | |
69 | unsigned int Free_list::num_remove_visits = 0; | |
70 | // The total number of calls to Free_list::allocate. | |
71 | unsigned int Free_list::num_allocates = 0; | |
72 | // The total number of nodes visited during calls to Free_list::allocate. | |
73 | unsigned int Free_list::num_allocate_visits = 0; | |
74 | ||
75 | // Initialize the free list. Creates a single free list node that | |
76 | // describes the entire region of length LEN. If EXTEND is true, | |
77 | // allocate() is allowed to extend the region beyond its initial | |
78 | // length. | |
79 | ||
80 | void | |
81 | Free_list::init(off_t len, bool extend) | |
82 | { | |
83 | this->list_.push_front(Free_list_node(0, len)); | |
84 | this->last_remove_ = this->list_.begin(); | |
85 | this->extend_ = extend; | |
86 | this->length_ = len; | |
87 | ++Free_list::num_lists; | |
88 | ++Free_list::num_nodes; | |
89 | } | |
90 | ||
91 | // Remove a chunk from the free list. Because we start with a single | |
92 | // node that covers the entire section, and remove chunks from it one | |
93 | // at a time, we do not need to coalesce chunks or handle cases that | |
94 | // span more than one free node. We expect to remove chunks from the | |
95 | // free list in order, and we expect to have only a few chunks of free | |
96 | // space left (corresponding to files that have changed since the last | |
97 | // incremental link), so a simple linear list should provide sufficient | |
98 | // performance. | |
99 | ||
100 | void | |
101 | Free_list::remove(off_t start, off_t end) | |
102 | { | |
103 | if (start == end) | |
104 | return; | |
105 | gold_assert(start < end); | |
106 | ||
107 | ++Free_list::num_removes; | |
108 | ||
109 | Iterator p = this->last_remove_; | |
110 | if (p->start_ > start) | |
111 | p = this->list_.begin(); | |
112 | ||
113 | for (; p != this->list_.end(); ++p) | |
114 | { | |
115 | ++Free_list::num_remove_visits; | |
116 | // Find a node that wholly contains the indicated region. | |
117 | if (p->start_ <= start && p->end_ >= end) | |
118 | { | |
119 | // Case 1: the indicated region spans the whole node. | |
120 | // Add some fuzz to avoid creating tiny free chunks. | |
121 | if (p->start_ + 3 >= start && p->end_ <= end + 3) | |
122 | p = this->list_.erase(p); | |
123 | // Case 2: remove a chunk from the start of the node. | |
124 | else if (p->start_ + 3 >= start) | |
125 | p->start_ = end; | |
126 | // Case 3: remove a chunk from the end of the node. | |
127 | else if (p->end_ <= end + 3) | |
128 | p->end_ = start; | |
129 | // Case 4: remove a chunk from the middle, and split | |
130 | // the node into two. | |
131 | else | |
132 | { | |
133 | Free_list_node newnode(p->start_, start); | |
134 | p->start_ = end; | |
135 | this->list_.insert(p, newnode); | |
136 | ++Free_list::num_nodes; | |
137 | } | |
138 | this->last_remove_ = p; | |
139 | return; | |
140 | } | |
141 | } | |
142 | ||
143 | // Did not find a node containing the given chunk. This could happen | |
144 | // because a small chunk was already removed due to the fuzz. | |
145 | gold_debug(DEBUG_INCREMENTAL, | |
146 | "Free_list::remove(%d,%d) not found", | |
147 | static_cast<int>(start), static_cast<int>(end)); | |
148 | } | |
149 | ||
150 | // Allocate a chunk of size LEN from the free list. Returns -1ULL | |
151 | // if a sufficiently large chunk of free space is not found. | |
152 | // We use a simple first-fit algorithm. | |
153 | ||
154 | off_t | |
155 | Free_list::allocate(off_t len, uint64_t align, off_t minoff) | |
156 | { | |
157 | gold_debug(DEBUG_INCREMENTAL, | |
2e702c99 RM |
158 | "Free_list::allocate(%08lx, %d, %08lx)", |
159 | static_cast<long>(len), static_cast<int>(align), | |
160 | static_cast<long>(minoff)); | |
cdc29364 CC |
161 | if (len == 0) |
162 | return align_address(minoff, align); | |
163 | ||
164 | ++Free_list::num_allocates; | |
165 | ||
8ea8cd50 CC |
166 | // We usually want to drop free chunks smaller than 4 bytes. |
167 | // If we need to guarantee a minimum hole size, though, we need | |
168 | // to keep track of all free chunks. | |
169 | const int fuzz = this->min_hole_ > 0 ? 0 : 3; | |
170 | ||
cdc29364 CC |
171 | for (Iterator p = this->list_.begin(); p != this->list_.end(); ++p) |
172 | { | |
173 | ++Free_list::num_allocate_visits; | |
174 | off_t start = p->start_ > minoff ? p->start_ : minoff; | |
175 | start = align_address(start, align); | |
176 | off_t end = start + len; | |
9fbd3822 CC |
177 | if (end > p->end_ && p->end_ == this->length_ && this->extend_) |
178 | { | |
179 | this->length_ = end; | |
180 | p->end_ = end; | |
181 | } | |
8ea8cd50 | 182 | if (end == p->end_ || (end <= p->end_ - this->min_hole_)) |
cdc29364 | 183 | { |
8ea8cd50 | 184 | if (p->start_ + fuzz >= start && p->end_ <= end + fuzz) |
cdc29364 | 185 | this->list_.erase(p); |
8ea8cd50 | 186 | else if (p->start_ + fuzz >= start) |
cdc29364 | 187 | p->start_ = end; |
8ea8cd50 | 188 | else if (p->end_ <= end + fuzz) |
cdc29364 CC |
189 | p->end_ = start; |
190 | else | |
191 | { | |
192 | Free_list_node newnode(p->start_, start); | |
193 | p->start_ = end; | |
194 | this->list_.insert(p, newnode); | |
195 | ++Free_list::num_nodes; | |
196 | } | |
197 | return start; | |
198 | } | |
199 | } | |
9fbd3822 CC |
200 | if (this->extend_) |
201 | { | |
202 | off_t start = align_address(this->length_, align); | |
203 | this->length_ = start + len; | |
204 | return start; | |
205 | } | |
cdc29364 CC |
206 | return -1; |
207 | } | |
208 | ||
209 | // Dump the free list (for debugging). | |
210 | void | |
211 | Free_list::dump() | |
212 | { | |
213 | gold_info("Free list:\n start end length\n"); | |
214 | for (Iterator p = this->list_.begin(); p != this->list_.end(); ++p) | |
215 | gold_info(" %08lx %08lx %08lx", static_cast<long>(p->start_), | |
216 | static_cast<long>(p->end_), | |
217 | static_cast<long>(p->end_ - p->start_)); | |
218 | } | |
219 | ||
220 | // Print the statistics for the free lists. | |
221 | void | |
222 | Free_list::print_stats() | |
223 | { | |
224 | fprintf(stderr, _("%s: total free lists: %u\n"), | |
2e702c99 | 225 | program_name, Free_list::num_lists); |
cdc29364 | 226 | fprintf(stderr, _("%s: total free list nodes: %u\n"), |
2e702c99 | 227 | program_name, Free_list::num_nodes); |
cdc29364 | 228 | fprintf(stderr, _("%s: calls to Free_list::remove: %u\n"), |
2e702c99 | 229 | program_name, Free_list::num_removes); |
cdc29364 | 230 | fprintf(stderr, _("%s: nodes visited: %u\n"), |
2e702c99 | 231 | program_name, Free_list::num_remove_visits); |
cdc29364 | 232 | fprintf(stderr, _("%s: calls to Free_list::allocate: %u\n"), |
2e702c99 | 233 | program_name, Free_list::num_allocates); |
cdc29364 | 234 | fprintf(stderr, _("%s: nodes visited: %u\n"), |
2e702c99 | 235 | program_name, Free_list::num_allocate_visits); |
cdc29364 CC |
236 | } |
237 | ||
e7c5ea40 CC |
238 | // A Hash_task computes the MD5 checksum of an array of char. |
239 | // It has a blocker on either side (i.e., the task cannot run until | |
240 | // the first is unblocked, and it unblocks the second after running). | |
241 | ||
242 | class Hash_task : public Task | |
243 | { | |
244 | public: | |
245 | Hash_task(const unsigned char* src, | |
bbc5ae17 RM |
246 | size_t size, |
247 | unsigned char* dst, | |
248 | Task_token* build_id_blocker, | |
249 | Task_token* final_blocker) | |
e7c5ea40 CC |
250 | : src_(src), size_(size), dst_(dst), build_id_blocker_(build_id_blocker), |
251 | final_blocker_(final_blocker) | |
252 | { } | |
253 | ||
254 | void | |
255 | run(Workqueue*) | |
256 | { md5_buffer(reinterpret_cast<const char*>(src_), size_, dst_); } | |
257 | ||
258 | Task_token* | |
259 | is_runnable(); | |
260 | ||
261 | // Unblock FINAL_BLOCKER_ when done. | |
262 | void | |
263 | locks(Task_locker* tl) | |
264 | { tl->add(this, this->final_blocker_); } | |
265 | ||
266 | std::string | |
267 | get_name() const | |
268 | { return "Hash_task"; } | |
269 | ||
270 | private: | |
271 | const unsigned char* const src_; | |
272 | const size_t size_; | |
273 | unsigned char* const dst_; | |
274 | Task_token* const build_id_blocker_; | |
275 | Task_token* const final_blocker_; | |
276 | }; | |
277 | ||
278 | Task_token* | |
279 | Hash_task::is_runnable() | |
280 | { | |
281 | if (this->build_id_blocker_->is_blocked()) | |
282 | return this->build_id_blocker_; | |
283 | return NULL; | |
284 | } | |
285 | ||
20e6d0d6 DK |
286 | // Layout::Relaxation_debug_check methods. |
287 | ||
288 | // Check that sections and special data are in reset states. | |
289 | // We do not save states for Output_sections and special Output_data. | |
290 | // So we check that they have not assigned any addresses or offsets. | |
291 | // clean_up_after_relaxation simply resets their addresses and offsets. | |
292 | void | |
293 | Layout::Relaxation_debug_check::check_output_data_for_reset_values( | |
294 | const Layout::Section_list& sections, | |
eb426534 RM |
295 | const Layout::Data_list& special_outputs, |
296 | const Layout::Data_list& relax_outputs) | |
20e6d0d6 DK |
297 | { |
298 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
299 | p != sections.end(); | |
300 | ++p) | |
301 | gold_assert((*p)->address_and_file_offset_have_reset_values()); | |
302 | ||
303 | for(Layout::Data_list::const_iterator p = special_outputs.begin(); | |
304 | p != special_outputs.end(); | |
305 | ++p) | |
306 | gold_assert((*p)->address_and_file_offset_have_reset_values()); | |
eb426534 RM |
307 | |
308 | gold_assert(relax_outputs.empty()); | |
20e6d0d6 | 309 | } |
2e702c99 | 310 | |
20e6d0d6 DK |
311 | // Save information of SECTIONS for checking later. |
312 | ||
313 | void | |
314 | Layout::Relaxation_debug_check::read_sections( | |
315 | const Layout::Section_list& sections) | |
316 | { | |
317 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
318 | p != sections.end(); | |
319 | ++p) | |
320 | { | |
321 | Output_section* os = *p; | |
322 | Section_info info; | |
323 | info.output_section = os; | |
324 | info.address = os->is_address_valid() ? os->address() : 0; | |
325 | info.data_size = os->is_data_size_valid() ? os->data_size() : -1; | |
326 | info.offset = os->is_offset_valid()? os->offset() : -1 ; | |
327 | this->section_infos_.push_back(info); | |
328 | } | |
329 | } | |
330 | ||
331 | // Verify SECTIONS using previously recorded information. | |
332 | ||
333 | void | |
334 | Layout::Relaxation_debug_check::verify_sections( | |
335 | const Layout::Section_list& sections) | |
336 | { | |
337 | size_t i = 0; | |
338 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
339 | p != sections.end(); | |
340 | ++p, ++i) | |
341 | { | |
342 | Output_section* os = *p; | |
343 | uint64_t address = os->is_address_valid() ? os->address() : 0; | |
344 | off_t data_size = os->is_data_size_valid() ? os->data_size() : -1; | |
345 | off_t offset = os->is_offset_valid()? os->offset() : -1 ; | |
346 | ||
347 | if (i >= this->section_infos_.size()) | |
348 | { | |
349 | gold_fatal("Section_info of %s missing.\n", os->name()); | |
350 | } | |
351 | const Section_info& info = this->section_infos_[i]; | |
352 | if (os != info.output_section) | |
353 | gold_fatal("Section order changed. Expecting %s but see %s\n", | |
354 | info.output_section->name(), os->name()); | |
355 | if (address != info.address | |
356 | || data_size != info.data_size | |
357 | || offset != info.offset) | |
358 | gold_fatal("Section %s changed.\n", os->name()); | |
359 | } | |
360 | } | |
361 | ||
92e059d8 | 362 | // Layout_task_runner methods. |
a2fb1b05 ILT |
363 | |
364 | // Lay out the sections. This is called after all the input objects | |
365 | // have been read. | |
366 | ||
367 | void | |
17a1d0a9 | 368 | Layout_task_runner::run(Workqueue* workqueue, const Task* task) |
a2fb1b05 | 369 | { |
dc3714f3 AM |
370 | // See if any of the input definitions violate the One Definition Rule. |
371 | // TODO: if this is too slow, do this as a task, rather than inline. | |
372 | this->symtab_->detect_odr_violations(task, this->options_.output_file_name()); | |
373 | ||
94a3fc8b CC |
374 | Layout* layout = this->layout_; |
375 | off_t file_size = layout->finalize(this->input_objects_, | |
376 | this->symtab_, | |
2e702c99 | 377 | this->target_, |
94a3fc8b | 378 | task); |
61ba1cf9 ILT |
379 | |
380 | // Now we know the final size of the output file and we know where | |
381 | // each piece of information goes. | |
7d9e3d98 ILT |
382 | |
383 | if (this->mapfile_ != NULL) | |
384 | { | |
385 | this->mapfile_->print_discarded_sections(this->input_objects_); | |
94a3fc8b | 386 | layout->print_to_mapfile(this->mapfile_); |
7d9e3d98 ILT |
387 | } |
388 | ||
cdc29364 | 389 | Output_file* of; |
94a3fc8b | 390 | if (layout->incremental_base() == NULL) |
cdc29364 CC |
391 | { |
392 | of = new Output_file(parameters->options().output_file_name()); | |
393 | if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF) | |
394 | of->set_is_temporary(); | |
395 | of->open(file_size); | |
396 | } | |
397 | else | |
398 | { | |
94a3fc8b CC |
399 | of = layout->incremental_base()->output_file(); |
400 | ||
401 | // Apply the incremental relocations for symbols whose values | |
402 | // have changed. We do this before we resize the file and start | |
403 | // writing anything else to it, so that we can read the old | |
404 | // incremental information from the file before (possibly) | |
405 | // overwriting it. | |
406 | if (parameters->incremental_update()) | |
2e702c99 RM |
407 | layout->incremental_base()->apply_incremental_relocs(this->symtab_, |
408 | this->layout_, | |
94a3fc8b CC |
409 | of); |
410 | ||
cdc29364 CC |
411 | of->resize(file_size); |
412 | } | |
61ba1cf9 ILT |
413 | |
414 | // Queue up the final set of tasks. | |
415 | gold::queue_final_tasks(this->options_, this->input_objects_, | |
94a3fc8b | 416 | this->symtab_, layout, workqueue, of); |
a2fb1b05 ILT |
417 | } |
418 | ||
419 | // Layout methods. | |
420 | ||
2ea97941 | 421 | Layout::Layout(int number_of_input_files, Script_options* script_options) |
e55bde5e | 422 | : number_of_input_files_(number_of_input_files), |
2ea97941 | 423 | script_options_(script_options), |
d491d34e ILT |
424 | namepool_(), |
425 | sympool_(), | |
426 | dynpool_(), | |
427 | signatures_(), | |
428 | section_name_map_(), | |
429 | segment_list_(), | |
430 | section_list_(), | |
431 | unattached_section_list_(), | |
d491d34e | 432 | special_output_list_(), |
eb426534 | 433 | relax_output_list_(), |
d491d34e ILT |
434 | section_headers_(NULL), |
435 | tls_segment_(NULL), | |
9f1d377b | 436 | relro_segment_(NULL), |
10b4f102 | 437 | interp_segment_(NULL), |
1a2dff53 | 438 | increase_relro_(0), |
d491d34e ILT |
439 | symtab_section_(NULL), |
440 | symtab_xindex_(NULL), | |
441 | dynsym_section_(NULL), | |
442 | dynsym_xindex_(NULL), | |
443 | dynamic_section_(NULL), | |
f0ba79e2 | 444 | dynamic_symbol_(NULL), |
d491d34e ILT |
445 | dynamic_data_(NULL), |
446 | eh_frame_section_(NULL), | |
447 | eh_frame_data_(NULL), | |
448 | added_eh_frame_data_(false), | |
449 | eh_frame_hdr_section_(NULL), | |
c1027032 | 450 | gdb_index_data_(NULL), |
d491d34e | 451 | build_id_note_(NULL), |
e7c5ea40 CC |
452 | array_of_hashes_(NULL), |
453 | size_of_array_of_hashes_(0), | |
454 | input_view_(NULL), | |
62b01cb5 ILT |
455 | debug_abbrev_(NULL), |
456 | debug_info_(NULL), | |
d491d34e ILT |
457 | group_signatures_(), |
458 | output_file_size_(-1), | |
d7bb5745 | 459 | have_added_input_section_(false), |
e55bde5e | 460 | sections_are_attached_(false), |
35cdfc9a ILT |
461 | input_requires_executable_stack_(false), |
462 | input_with_gnu_stack_note_(false), | |
535890bb | 463 | input_without_gnu_stack_note_(false), |
17a1d0a9 | 464 | has_static_tls_(false), |
e55bde5e | 465 | any_postprocessing_sections_(false), |
3ce2c28e | 466 | resized_signatures_(false), |
1518dc8f | 467 | have_stabstr_section_(false), |
e9552f7e | 468 | section_ordering_specified_(false), |
16164a6b | 469 | unique_segment_for_sections_specified_(false), |
20e6d0d6 DK |
470 | incremental_inputs_(NULL), |
471 | record_output_section_data_from_script_(false), | |
472 | script_output_section_data_list_(), | |
473 | segment_states_(NULL), | |
cdc29364 | 474 | relaxation_debug_check_(NULL), |
f0558624 | 475 | section_order_map_(), |
16164a6b | 476 | section_segment_map_(), |
e9552f7e ST |
477 | input_section_position_(), |
478 | input_section_glob_(), | |
cdc29364 CC |
479 | incremental_base_(NULL), |
480 | free_list_() | |
54dc6425 ILT |
481 | { |
482 | // Make space for more than enough segments for a typical file. | |
483 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
484 | this->segment_list_.reserve(12); |
485 | ||
27bc2bce ILT |
486 | // We expect two unattached Output_data objects: the file header and |
487 | // the segment headers. | |
488 | this->special_output_list_.reserve(2); | |
3ce2c28e ILT |
489 | |
490 | // Initialize structure needed for an incremental build. | |
8c21d9d3 | 491 | if (parameters->incremental()) |
3ce2c28e | 492 | this->incremental_inputs_ = new Incremental_inputs; |
f7c8a183 ILT |
493 | |
494 | // The section name pool is worth optimizing in all cases, because | |
495 | // it is small, but there are often overlaps due to .rel sections. | |
496 | this->namepool_.set_optimize(); | |
54dc6425 ILT |
497 | } |
498 | ||
cdc29364 CC |
499 | // For incremental links, record the base file to be modified. |
500 | ||
501 | void | |
502 | Layout::set_incremental_base(Incremental_binary* base) | |
503 | { | |
504 | this->incremental_base_ = base; | |
505 | this->free_list_.init(base->output_file()->filesize(), true); | |
506 | } | |
507 | ||
a2fb1b05 ILT |
508 | // Hash a key we use to look up an output section mapping. |
509 | ||
510 | size_t | |
511 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
512 | { | |
f0641a0b | 513 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
514 | } |
515 | ||
fb1b895d CC |
516 | // These are the debug sections that are actually used by gdb. |
517 | // Currently, we've checked versions of gdb up to and including 7.4. | |
518 | // We only check the part of the name that follows ".debug_" or | |
519 | // ".zdebug_". | |
02d2ba74 ILT |
520 | |
521 | static const char* gdb_sections[] = | |
fb1b895d CC |
522 | { |
523 | "abbrev", | |
524 | "addr", // Fission extension | |
525 | // "aranges", // not used by gdb as of 7.4 | |
526 | "frame", | |
527 | "info", | |
528 | "types", | |
529 | "line", | |
530 | "loc", | |
531 | "macinfo", | |
532 | "macro", | |
533 | // "pubnames", // not used by gdb as of 7.4 | |
534 | // "pubtypes", // not used by gdb as of 7.4 | |
535 | "ranges", | |
536 | "str", | |
02d2ba74 ILT |
537 | }; |
538 | ||
fb1b895d CC |
539 | // This is the minimum set of sections needed for line numbers. |
540 | ||
62b01cb5 | 541 | static const char* lines_only_debug_sections[] = |
fb1b895d CC |
542 | { |
543 | "abbrev", | |
544 | // "addr", // Fission extension | |
545 | // "aranges", // not used by gdb as of 7.4 | |
546 | // "frame", | |
547 | "info", | |
548 | // "types", | |
549 | "line", | |
550 | // "loc", | |
551 | // "macinfo", | |
552 | // "macro", | |
553 | // "pubnames", // not used by gdb as of 7.4 | |
554 | // "pubtypes", // not used by gdb as of 7.4 | |
555 | // "ranges", | |
556 | "str", | |
557 | }; | |
558 | ||
559 | // These sections are the DWARF fast-lookup tables, and are not needed | |
560 | // when building a .gdb_index section. | |
561 | ||
562 | static const char* gdb_fast_lookup_sections[] = | |
563 | { | |
564 | "aranges", | |
565 | "pubnames", | |
566 | "pubtypes", | |
62b01cb5 ILT |
567 | }; |
568 | ||
fb1b895d CC |
569 | // Returns whether the given debug section is in the list of |
570 | // debug-sections-used-by-some-version-of-gdb. SUFFIX is the | |
571 | // portion of the name following ".debug_" or ".zdebug_". | |
572 | ||
02d2ba74 | 573 | static inline bool |
fb1b895d | 574 | is_gdb_debug_section(const char* suffix) |
02d2ba74 ILT |
575 | { |
576 | // We can do this faster: binary search or a hashtable. But why bother? | |
577 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) | |
fb1b895d | 578 | if (strcmp(suffix, gdb_sections[i]) == 0) |
02d2ba74 ILT |
579 | return true; |
580 | return false; | |
581 | } | |
582 | ||
fb1b895d CC |
583 | // Returns whether the given section is needed for lines-only debugging. |
584 | ||
62b01cb5 | 585 | static inline bool |
fb1b895d | 586 | is_lines_only_debug_section(const char* suffix) |
62b01cb5 ILT |
587 | { |
588 | // We can do this faster: binary search or a hashtable. But why bother? | |
589 | for (size_t i = 0; | |
590 | i < sizeof(lines_only_debug_sections)/sizeof(*lines_only_debug_sections); | |
591 | ++i) | |
fb1b895d CC |
592 | if (strcmp(suffix, lines_only_debug_sections[i]) == 0) |
593 | return true; | |
594 | return false; | |
595 | } | |
596 | ||
597 | // Returns whether the given section is a fast-lookup section that | |
598 | // will not be needed when building a .gdb_index section. | |
599 | ||
600 | static inline bool | |
601 | is_gdb_fast_lookup_section(const char* suffix) | |
602 | { | |
603 | // We can do this faster: binary search or a hashtable. But why bother? | |
604 | for (size_t i = 0; | |
605 | i < sizeof(gdb_fast_lookup_sections)/sizeof(*gdb_fast_lookup_sections); | |
606 | ++i) | |
607 | if (strcmp(suffix, gdb_fast_lookup_sections[i]) == 0) | |
62b01cb5 ILT |
608 | return true; |
609 | return false; | |
610 | } | |
611 | ||
6fc6ea19 CC |
612 | // Sometimes we compress sections. This is typically done for |
613 | // sections that are not part of normal program execution (such as | |
614 | // .debug_* sections), and where the readers of these sections know | |
615 | // how to deal with compressed sections. This routine doesn't say for | |
616 | // certain whether we'll compress -- it depends on commandline options | |
617 | // as well -- just whether this section is a candidate for compression. | |
618 | // (The Output_compressed_section class decides whether to compress | |
619 | // a given section, and picks the name of the compressed section.) | |
620 | ||
621 | static bool | |
622 | is_compressible_debug_section(const char* secname) | |
623 | { | |
624 | return (is_prefix_of(".debug", secname)); | |
625 | } | |
626 | ||
627 | // We may see compressed debug sections in input files. Return TRUE | |
628 | // if this is the name of a compressed debug section. | |
629 | ||
630 | bool | |
631 | is_compressed_debug_section(const char* secname) | |
632 | { | |
633 | return (is_prefix_of(".zdebug", secname)); | |
634 | } | |
635 | ||
a2fb1b05 ILT |
636 | // Whether to include this section in the link. |
637 | ||
638 | template<int size, bool big_endian> | |
639 | bool | |
6fa2a40b | 640 | Layout::include_section(Sized_relobj_file<size, big_endian>*, const char* name, |
a2fb1b05 ILT |
641 | const elfcpp::Shdr<size, big_endian>& shdr) |
642 | { | |
ae034989 ST |
643 | if (!parameters->options().relocatable() |
644 | && (shdr.get_sh_flags() & elfcpp::SHF_EXCLUDE)) | |
fd06b4aa CC |
645 | return false; |
646 | ||
a2fb1b05 ILT |
647 | switch (shdr.get_sh_type()) |
648 | { | |
649 | case elfcpp::SHT_NULL: | |
650 | case elfcpp::SHT_SYMTAB: | |
651 | case elfcpp::SHT_DYNSYM: | |
a2fb1b05 ILT |
652 | case elfcpp::SHT_HASH: |
653 | case elfcpp::SHT_DYNAMIC: | |
654 | case elfcpp::SHT_SYMTAB_SHNDX: | |
655 | return false; | |
656 | ||
5cb66f97 ILT |
657 | case elfcpp::SHT_STRTAB: |
658 | // Discard the sections which have special meanings in the ELF | |
659 | // ABI. Keep others (e.g., .stabstr). We could also do this by | |
660 | // checking the sh_link fields of the appropriate sections. | |
661 | return (strcmp(name, ".dynstr") != 0 | |
662 | && strcmp(name, ".strtab") != 0 | |
663 | && strcmp(name, ".shstrtab") != 0); | |
664 | ||
a2fb1b05 ILT |
665 | case elfcpp::SHT_RELA: |
666 | case elfcpp::SHT_REL: | |
667 | case elfcpp::SHT_GROUP: | |
7019cd25 ILT |
668 | // If we are emitting relocations these should be handled |
669 | // elsewhere. | |
1e2bee4f | 670 | gold_assert(!parameters->options().relocatable()); |
6a74a719 | 671 | return false; |
a2fb1b05 | 672 | |
9e2dcb77 | 673 | case elfcpp::SHT_PROGBITS: |
8851ecca | 674 | if (parameters->options().strip_debug() |
9e2dcb77 ILT |
675 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
676 | { | |
e94cf127 | 677 | if (is_debug_info_section(name)) |
9e2dcb77 ILT |
678 | return false; |
679 | } | |
62b01cb5 ILT |
680 | if (parameters->options().strip_debug_non_line() |
681 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
682 | { | |
683 | // Debugging sections can only be recognized by name. | |
fb1b895d CC |
684 | if (is_prefix_of(".debug_", name) |
685 | && !is_lines_only_debug_section(name + 7)) | |
686 | return false; | |
687 | if (is_prefix_of(".zdebug_", name) | |
688 | && !is_lines_only_debug_section(name + 8)) | |
62b01cb5 ILT |
689 | return false; |
690 | } | |
8851ecca | 691 | if (parameters->options().strip_debug_gdb() |
02d2ba74 ILT |
692 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
693 | { | |
694 | // Debugging sections can only be recognized by name. | |
fb1b895d CC |
695 | if (is_prefix_of(".debug_", name) |
696 | && !is_gdb_debug_section(name + 7)) | |
697 | return false; | |
698 | if (is_prefix_of(".zdebug_", name) | |
699 | && !is_gdb_debug_section(name + 8)) | |
700 | return false; | |
701 | } | |
702 | if (parameters->options().gdb_index() | |
703 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
704 | { | |
705 | // When building .gdb_index, we can strip .debug_pubnames, | |
706 | // .debug_pubtypes, and .debug_aranges sections. | |
707 | if (is_prefix_of(".debug_", name) | |
708 | && is_gdb_fast_lookup_section(name + 7)) | |
709 | return false; | |
710 | if (is_prefix_of(".zdebug_", name) | |
711 | && is_gdb_fast_lookup_section(name + 8)) | |
02d2ba74 ILT |
712 | return false; |
713 | } | |
fd06b4aa | 714 | if (parameters->options().strip_lto_sections() |
2e702c99 RM |
715 | && !parameters->options().relocatable() |
716 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
717 | { | |
718 | // Ignore LTO sections containing intermediate code. | |
719 | if (is_prefix_of(".gnu.lto_", name)) | |
720 | return false; | |
721 | } | |
6b7dd3f3 ILT |
722 | // The GNU linker strips .gnu_debuglink sections, so we do too. |
723 | // This is a feature used to keep debugging information in | |
724 | // separate files. | |
725 | if (strcmp(name, ".gnu_debuglink") == 0) | |
726 | return false; | |
9e2dcb77 ILT |
727 | return true; |
728 | ||
a2fb1b05 | 729 | default: |
a2fb1b05 ILT |
730 | return true; |
731 | } | |
732 | } | |
733 | ||
ead1e424 | 734 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 735 | |
a2fb1b05 | 736 | Output_section* |
ead1e424 | 737 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 738 | { |
a445fddf ILT |
739 | for (Section_list::const_iterator p = this->section_list_.begin(); |
740 | p != this->section_list_.end(); | |
ead1e424 | 741 | ++p) |
a445fddf ILT |
742 | if (strcmp((*p)->name(), name) == 0) |
743 | return *p; | |
ead1e424 ILT |
744 | return NULL; |
745 | } | |
a2fb1b05 | 746 | |
ead1e424 ILT |
747 | // Return an output segment of type TYPE, with segment flags SET set |
748 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 749 | |
ead1e424 ILT |
750 | Output_segment* |
751 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
752 | elfcpp::Elf_Word clear) const | |
753 | { | |
754 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
755 | p != this->segment_list_.end(); | |
756 | ++p) | |
757 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
758 | && ((*p)->flags() & set) == set | |
759 | && ((*p)->flags() & clear) == 0) | |
760 | return *p; | |
761 | return NULL; | |
762 | } | |
a2fb1b05 | 763 | |
487b39df ILT |
764 | // When we put a .ctors or .dtors section with more than one word into |
765 | // a .init_array or .fini_array section, we need to reverse the words | |
766 | // in the .ctors/.dtors section. This is because .init_array executes | |
767 | // constructors front to back, where .ctors executes them back to | |
768 | // front, and vice-versa for .fini_array/.dtors. Although we do want | |
769 | // to remap .ctors/.dtors into .init_array/.fini_array because it can | |
770 | // be more efficient, we don't want to change the order in which | |
771 | // constructors/destructors are run. This set just keeps track of | |
772 | // these sections which need to be reversed. It is only changed by | |
773 | // Layout::layout. It should be a private member of Layout, but that | |
774 | // would require layout.h to #include object.h to get the definition | |
775 | // of Section_id. | |
776 | static Unordered_set<Section_id, Section_id_hash> ctors_sections_in_init_array; | |
777 | ||
778 | // Return whether OBJECT/SHNDX is a .ctors/.dtors section mapped to a | |
779 | // .init_array/.fini_array section. | |
780 | ||
781 | bool | |
782 | Layout::is_ctors_in_init_array(Relobj* relobj, unsigned int shndx) const | |
783 | { | |
784 | return (ctors_sections_in_init_array.find(Section_id(relobj, shndx)) | |
785 | != ctors_sections_in_init_array.end()); | |
786 | } | |
787 | ||
ead1e424 | 788 | // Return the output section to use for section NAME with type TYPE |
a445fddf | 789 | // and section flags FLAGS. NAME must be canonicalized in the string |
10b4f102 ILT |
790 | // pool, and NAME_KEY is the key. ORDER is where this should appear |
791 | // in the output sections. IS_RELRO is true for a relro section. | |
a2fb1b05 | 792 | |
ead1e424 | 793 | Output_section* |
f0641a0b | 794 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
f5c870d2 | 795 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, |
22f0da72 | 796 | Output_section_order order, bool is_relro) |
ead1e424 | 797 | { |
5393d741 ILT |
798 | elfcpp::Elf_Word lookup_type = type; |
799 | ||
800 | // For lookup purposes, treat INIT_ARRAY, FINI_ARRAY, and | |
801 | // PREINIT_ARRAY like PROGBITS. This ensures that we combine | |
802 | // .init_array, .fini_array, and .preinit_array sections by name | |
803 | // whatever their type in the input file. We do this because the | |
804 | // types are not always right in the input files. | |
805 | if (lookup_type == elfcpp::SHT_INIT_ARRAY | |
806 | || lookup_type == elfcpp::SHT_FINI_ARRAY | |
807 | || lookup_type == elfcpp::SHT_PREINIT_ARRAY) | |
808 | lookup_type = elfcpp::SHT_PROGBITS; | |
809 | ||
154e0e9a ILT |
810 | elfcpp::Elf_Xword lookup_flags = flags; |
811 | ||
812 | // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine | |
813 | // read-write with read-only sections. Some other ELF linkers do | |
814 | // not do this. FIXME: Perhaps there should be an option | |
815 | // controlling this. | |
816 | lookup_flags &= ~(elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
817 | ||
5393d741 | 818 | const Key key(name_key, std::make_pair(lookup_type, lookup_flags)); |
a2fb1b05 ILT |
819 | const std::pair<Key, Output_section*> v(key, NULL); |
820 | std::pair<Section_name_map::iterator, bool> ins( | |
821 | this->section_name_map_.insert(v)); | |
822 | ||
a2fb1b05 | 823 | if (!ins.second) |
ead1e424 | 824 | return ins.first->second; |
a2fb1b05 ILT |
825 | else |
826 | { | |
827 | // This is the first time we've seen this name/type/flags | |
4e2b1697 ILT |
828 | // combination. For compatibility with the GNU linker, we |
829 | // combine sections with contents and zero flags with sections | |
830 | // with non-zero flags. This is a workaround for cases where | |
831 | // assembler code forgets to set section flags. FIXME: Perhaps | |
832 | // there should be an option to control this. | |
15cf077e | 833 | Output_section* os = NULL; |
4e2b1697 | 834 | |
5393d741 | 835 | if (lookup_type == elfcpp::SHT_PROGBITS) |
15cf077e | 836 | { |
2e702c99 RM |
837 | if (flags == 0) |
838 | { | |
839 | Output_section* same_name = this->find_output_section(name); | |
840 | if (same_name != NULL | |
841 | && (same_name->type() == elfcpp::SHT_PROGBITS | |
5393d741 ILT |
842 | || same_name->type() == elfcpp::SHT_INIT_ARRAY |
843 | || same_name->type() == elfcpp::SHT_FINI_ARRAY | |
844 | || same_name->type() == elfcpp::SHT_PREINIT_ARRAY) | |
2e702c99 RM |
845 | && (same_name->flags() & elfcpp::SHF_TLS) == 0) |
846 | os = same_name; | |
847 | } | |
848 | else if ((flags & elfcpp::SHF_TLS) == 0) | |
849 | { | |
850 | elfcpp::Elf_Xword zero_flags = 0; | |
851 | const Key zero_key(name_key, std::make_pair(lookup_type, | |
5393d741 | 852 | zero_flags)); |
2e702c99 RM |
853 | Section_name_map::iterator p = |
854 | this->section_name_map_.find(zero_key); | |
855 | if (p != this->section_name_map_.end()) | |
154e0e9a | 856 | os = p->second; |
2e702c99 | 857 | } |
15cf077e | 858 | } |
4e2b1697 | 859 | |
15cf077e | 860 | if (os == NULL) |
22f0da72 ILT |
861 | os = this->make_output_section(name, type, flags, order, is_relro); |
862 | ||
a2fb1b05 | 863 | ins.first->second = os; |
ead1e424 | 864 | return os; |
a2fb1b05 | 865 | } |
ead1e424 ILT |
866 | } |
867 | ||
b9b2ae8b NC |
868 | // Returns TRUE iff NAME (an input section from RELOBJ) will |
869 | // be mapped to an output section that should be KEPT. | |
870 | ||
871 | bool | |
872 | Layout::keep_input_section(const Relobj* relobj, const char* name) | |
873 | { | |
874 | if (! this->script_options_->saw_sections_clause()) | |
875 | return false; | |
876 | ||
877 | Script_sections* ss = this->script_options_->script_sections(); | |
878 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
879 | Output_section** output_section_slot; | |
880 | Script_sections::Section_type script_section_type; | |
881 | bool keep; | |
882 | ||
883 | name = ss->output_section_name(file_name, name, &output_section_slot, | |
884 | &script_section_type, &keep); | |
885 | return name != NULL && keep; | |
886 | } | |
887 | ||
16164a6b ST |
888 | // Clear the input section flags that should not be copied to the |
889 | // output section. | |
890 | ||
891 | elfcpp::Elf_Xword | |
892 | Layout::get_output_section_flags(elfcpp::Elf_Xword input_section_flags) | |
893 | { | |
894 | // Some flags in the input section should not be automatically | |
895 | // copied to the output section. | |
896 | input_section_flags &= ~ (elfcpp::SHF_INFO_LINK | |
897 | | elfcpp::SHF_GROUP | |
898 | | elfcpp::SHF_MERGE | |
899 | | elfcpp::SHF_STRINGS); | |
900 | ||
901 | // We only clear the SHF_LINK_ORDER flag in for | |
902 | // a non-relocatable link. | |
903 | if (!parameters->options().relocatable()) | |
904 | input_section_flags &= ~elfcpp::SHF_LINK_ORDER; | |
905 | ||
906 | return input_section_flags; | |
907 | } | |
908 | ||
a445fddf ILT |
909 | // Pick the output section to use for section NAME, in input file |
910 | // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a | |
154e0e9a ILT |
911 | // linker created section. IS_INPUT_SECTION is true if we are |
912 | // choosing an output section for an input section found in a input | |
10b4f102 ILT |
913 | // file. ORDER is where this section should appear in the output |
914 | // sections. IS_RELRO is true for a relro section. This will return | |
915 | // NULL if the input section should be discarded. | |
a445fddf ILT |
916 | |
917 | Output_section* | |
918 | Layout::choose_output_section(const Relobj* relobj, const char* name, | |
919 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
22f0da72 ILT |
920 | bool is_input_section, Output_section_order order, |
921 | bool is_relro) | |
a445fddf | 922 | { |
154e0e9a ILT |
923 | // We should not see any input sections after we have attached |
924 | // sections to segments. | |
925 | gold_assert(!is_input_section || !this->sections_are_attached_); | |
926 | ||
16164a6b | 927 | flags = this->get_output_section_flags(flags); |
c9484ea5 | 928 | |
a445fddf ILT |
929 | if (this->script_options_->saw_sections_clause()) |
930 | { | |
931 | // We are using a SECTIONS clause, so the output section is | |
932 | // chosen based only on the name. | |
933 | ||
934 | Script_sections* ss = this->script_options_->script_sections(); | |
935 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
936 | Output_section** output_section_slot; | |
1e5d2fb1 | 937 | Script_sections::Section_type script_section_type; |
7f8cd844 | 938 | const char* orig_name = name; |
b9b2ae8b | 939 | bool keep; |
1e5d2fb1 | 940 | name = ss->output_section_name(file_name, name, &output_section_slot, |
b9b2ae8b NC |
941 | &script_section_type, &keep); |
942 | ||
a445fddf ILT |
943 | if (name == NULL) |
944 | { | |
7f8cd844 NC |
945 | gold_debug(DEBUG_SCRIPT, _("Unable to create output section '%s' " |
946 | "because it is not allowed by the " | |
947 | "SECTIONS clause of the linker script"), | |
948 | orig_name); | |
a445fddf ILT |
949 | // The SECTIONS clause says to discard this input section. |
950 | return NULL; | |
951 | } | |
952 | ||
1e5d2fb1 DK |
953 | // We can only handle script section types ST_NONE and ST_NOLOAD. |
954 | switch (script_section_type) | |
955 | { | |
956 | case Script_sections::ST_NONE: | |
957 | break; | |
958 | case Script_sections::ST_NOLOAD: | |
959 | flags &= elfcpp::SHF_ALLOC; | |
960 | break; | |
961 | default: | |
962 | gold_unreachable(); | |
963 | } | |
964 | ||
a445fddf ILT |
965 | // If this is an orphan section--one not mentioned in the linker |
966 | // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the | |
967 | // default processing below. | |
968 | ||
969 | if (output_section_slot != NULL) | |
970 | { | |
971 | if (*output_section_slot != NULL) | |
9c547ec3 ILT |
972 | { |
973 | (*output_section_slot)->update_flags_for_input_section(flags); | |
974 | return *output_section_slot; | |
975 | } | |
a445fddf ILT |
976 | |
977 | // We don't put sections found in the linker script into | |
978 | // SECTION_NAME_MAP_. That keeps us from getting confused | |
979 | // if an orphan section is mapped to a section with the same | |
980 | // name as one in the linker script. | |
981 | ||
982 | name = this->namepool_.add(name, false, NULL); | |
983 | ||
22f0da72 ILT |
984 | Output_section* os = this->make_output_section(name, type, flags, |
985 | order, is_relro); | |
986 | ||
a445fddf | 987 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
988 | |
989 | // Special handling for NOLOAD sections. | |
990 | if (script_section_type == Script_sections::ST_NOLOAD) | |
991 | { | |
992 | os->set_is_noload(); | |
993 | ||
994 | // The constructor of Output_section sets addresses of non-ALLOC | |
995 | // sections to 0 by default. We don't want that for NOLOAD | |
996 | // sections even if they have no SHF_ALLOC flag. | |
997 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0 | |
998 | && os->is_address_valid()) | |
999 | { | |
1000 | gold_assert(os->address() == 0 | |
1001 | && !os->is_offset_valid() | |
1002 | && !os->is_data_size_valid()); | |
1003 | os->reset_address_and_file_offset(); | |
1004 | } | |
1005 | } | |
1006 | ||
a445fddf ILT |
1007 | *output_section_slot = os; |
1008 | return os; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | // FIXME: Handle SHF_OS_NONCONFORMING somewhere. | |
1013 | ||
6fc6ea19 CC |
1014 | size_t len = strlen(name); |
1015 | char* uncompressed_name = NULL; | |
1016 | ||
1017 | // Compressed debug sections should be mapped to the corresponding | |
1018 | // uncompressed section. | |
1019 | if (is_compressed_debug_section(name)) | |
1020 | { | |
1021 | uncompressed_name = new char[len]; | |
1022 | uncompressed_name[0] = '.'; | |
1023 | gold_assert(name[0] == '.' && name[1] == 'z'); | |
1024 | strncpy(&uncompressed_name[1], &name[2], len - 2); | |
1025 | uncompressed_name[len - 1] = '\0'; | |
1026 | len -= 1; | |
1027 | name = uncompressed_name; | |
1028 | } | |
1029 | ||
a445fddf ILT |
1030 | // Turn NAME from the name of the input section into the name of the |
1031 | // output section. | |
401a9a73 CC |
1032 | if (is_input_section |
1033 | && !this->script_options_->saw_sections_clause() | |
1034 | && !parameters->options().relocatable()) | |
921b5322 AM |
1035 | { |
1036 | const char *orig_name = name; | |
1037 | name = parameters->target().output_section_name(relobj, name, &len); | |
1038 | if (name == NULL) | |
1039 | name = Layout::output_section_name(relobj, orig_name, &len); | |
1040 | } | |
a445fddf ILT |
1041 | |
1042 | Stringpool::Key name_key; | |
1043 | name = this->namepool_.add_with_length(name, len, true, &name_key); | |
1044 | ||
6fc6ea19 CC |
1045 | if (uncompressed_name != NULL) |
1046 | delete[] uncompressed_name; | |
1047 | ||
a445fddf ILT |
1048 | // Find or make the output section. The output section is selected |
1049 | // based on the section name, type, and flags. | |
22f0da72 | 1050 | return this->get_output_section(name, name_key, type, flags, order, is_relro); |
a445fddf ILT |
1051 | } |
1052 | ||
cdc29364 CC |
1053 | // For incremental links, record the initial fixed layout of a section |
1054 | // from the base file, and return a pointer to the Output_section. | |
1055 | ||
1056 | template<int size, bool big_endian> | |
1057 | Output_section* | |
1058 | Layout::init_fixed_output_section(const char* name, | |
1059 | elfcpp::Shdr<size, big_endian>& shdr) | |
1060 | { | |
1061 | unsigned int sh_type = shdr.get_sh_type(); | |
1062 | ||
aa06ae28 CC |
1063 | // We preserve the layout of PROGBITS, NOBITS, INIT_ARRAY, FINI_ARRAY, |
1064 | // PRE_INIT_ARRAY, and NOTE sections. | |
cdc29364 | 1065 | // All others will be created from scratch and reallocated. |
aa06ae28 | 1066 | if (!can_incremental_update(sh_type)) |
cdc29364 CC |
1067 | return NULL; |
1068 | ||
c1027032 CC |
1069 | // If we're generating a .gdb_index section, we need to regenerate |
1070 | // it from scratch. | |
1071 | if (parameters->options().gdb_index() | |
1072 | && sh_type == elfcpp::SHT_PROGBITS | |
1073 | && strcmp(name, ".gdb_index") == 0) | |
1074 | return NULL; | |
1075 | ||
cdc29364 CC |
1076 | typename elfcpp::Elf_types<size>::Elf_Addr sh_addr = shdr.get_sh_addr(); |
1077 | typename elfcpp::Elf_types<size>::Elf_Off sh_offset = shdr.get_sh_offset(); | |
1078 | typename elfcpp::Elf_types<size>::Elf_WXword sh_size = shdr.get_sh_size(); | |
1079 | typename elfcpp::Elf_types<size>::Elf_WXword sh_flags = shdr.get_sh_flags(); | |
1080 | typename elfcpp::Elf_types<size>::Elf_WXword sh_addralign = | |
1081 | shdr.get_sh_addralign(); | |
1082 | ||
1083 | // Make the output section. | |
1084 | Stringpool::Key name_key; | |
1085 | name = this->namepool_.add(name, true, &name_key); | |
1086 | Output_section* os = this->get_output_section(name, name_key, sh_type, | |
2e702c99 | 1087 | sh_flags, ORDER_INVALID, false); |
cdc29364 CC |
1088 | os->set_fixed_layout(sh_addr, sh_offset, sh_size, sh_addralign); |
1089 | if (sh_type != elfcpp::SHT_NOBITS) | |
1090 | this->free_list_.remove(sh_offset, sh_offset + sh_size); | |
1091 | return os; | |
1092 | } | |
1093 | ||
edcac0c1 ILT |
1094 | // Return the index by which an input section should be ordered. This |
1095 | // is used to sort some .text sections, for compatibility with GNU ld. | |
1096 | ||
1097 | int | |
1098 | Layout::special_ordering_of_input_section(const char* name) | |
1099 | { | |
1100 | // The GNU linker has some special handling for some sections that | |
1101 | // wind up in the .text section. Sections that start with these | |
1102 | // prefixes must appear first, and must appear in the order listed | |
1103 | // here. | |
bbc5ae17 | 1104 | static const char* const text_section_sort[] = |
edcac0c1 ILT |
1105 | { |
1106 | ".text.unlikely", | |
1107 | ".text.exit", | |
1108 | ".text.startup", | |
1109 | ".text.hot" | |
1110 | }; | |
1111 | ||
1112 | for (size_t i = 0; | |
1113 | i < sizeof(text_section_sort) / sizeof(text_section_sort[0]); | |
1114 | i++) | |
1115 | if (is_prefix_of(text_section_sort[i], name)) | |
1116 | return i; | |
1117 | ||
1118 | return -1; | |
1119 | } | |
1120 | ||
ead1e424 | 1121 | // Return the output section to use for input section SHNDX, with name |
730cdc88 ILT |
1122 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
1123 | // index of a relocation section which applies to this section, or 0 | |
1124 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
1125 | // relocation section if there is one. Set *OFF to the offset of this | |
1126 | // input section without the output section. Return NULL if the | |
1127 | // section should be discarded. Set *OFF to -1 if the section | |
1128 | // contents should not be written directly to the output file, but | |
1129 | // will instead receive special handling. | |
ead1e424 ILT |
1130 | |
1131 | template<int size, bool big_endian> | |
1132 | Output_section* | |
6fa2a40b | 1133 | Layout::layout(Sized_relobj_file<size, big_endian>* object, unsigned int shndx, |
730cdc88 ILT |
1134 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, |
1135 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 | 1136 | { |
ef9beddf ILT |
1137 | *off = 0; |
1138 | ||
ead1e424 ILT |
1139 | if (!this->include_section(object, name, shdr)) |
1140 | return NULL; | |
1141 | ||
2a0ff005 | 1142 | elfcpp::Elf_Word sh_type = shdr.get_sh_type(); |
2a0ff005 | 1143 | |
6a74a719 ILT |
1144 | // In a relocatable link a grouped section must not be combined with |
1145 | // any other sections. | |
5393d741 | 1146 | Output_section* os; |
8851ecca | 1147 | if (parameters->options().relocatable() |
6a74a719 ILT |
1148 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
1149 | { | |
1150 | name = this->namepool_.add(name, true, NULL); | |
22f0da72 ILT |
1151 | os = this->make_output_section(name, sh_type, shdr.get_sh_flags(), |
1152 | ORDER_INVALID, false); | |
6a74a719 ILT |
1153 | } |
1154 | else | |
1155 | { | |
16164a6b ST |
1156 | // Plugins can choose to place one or more subsets of sections in |
1157 | // unique segments and this is done by mapping these section subsets | |
1158 | // to unique output sections. Check if this section needs to be | |
1159 | // remapped to a unique output section. | |
1160 | Section_segment_map::iterator it | |
1161 | = this->section_segment_map_.find(Const_section_id(object, shndx)); | |
1162 | if (it == this->section_segment_map_.end()) | |
1163 | { | |
bbc5ae17 | 1164 | os = this->choose_output_section(object, name, sh_type, |
16164a6b ST |
1165 | shdr.get_sh_flags(), true, |
1166 | ORDER_INVALID, false); | |
1167 | } | |
1168 | else | |
1169 | { | |
1170 | // We know the name of the output section, directly call | |
1171 | // get_output_section here by-passing choose_output_section. | |
1172 | elfcpp::Elf_Xword flags | |
1173 | = this->get_output_section_flags(shdr.get_sh_flags()); | |
1174 | ||
1175 | const char* os_name = it->second->name; | |
1176 | Stringpool::Key name_key; | |
1177 | os_name = this->namepool_.add(os_name, true, &name_key); | |
1178 | os = this->get_output_section(os_name, name_key, sh_type, flags, | |
1179 | ORDER_INVALID, false); | |
1180 | if (!os->is_unique_segment()) | |
1181 | { | |
1182 | os->set_is_unique_segment(); | |
1183 | os->set_extra_segment_flags(it->second->flags); | |
1184 | os->set_segment_alignment(it->second->align); | |
1185 | } | |
1186 | } | |
6a74a719 ILT |
1187 | if (os == NULL) |
1188 | return NULL; | |
1189 | } | |
a2fb1b05 | 1190 | |
2fd32231 | 1191 | // By default the GNU linker sorts input sections whose names match |
487b39df ILT |
1192 | // .ctors.*, .dtors.*, .init_array.*, or .fini_array.*. The |
1193 | // sections are sorted by name. This is used to implement | |
1194 | // constructor priority ordering. We are compatible. When we put | |
1195 | // .ctor sections in .init_array and .dtor sections in .fini_array, | |
1196 | // we must also sort plain .ctor and .dtor sections. | |
2fd32231 | 1197 | if (!this->script_options_->saw_sections_clause() |
5393d741 | 1198 | && !parameters->options().relocatable() |
2fd32231 ILT |
1199 | && (is_prefix_of(".ctors.", name) |
1200 | || is_prefix_of(".dtors.", name) | |
1201 | || is_prefix_of(".init_array.", name) | |
5393d741 ILT |
1202 | || is_prefix_of(".fini_array.", name) |
1203 | || (parameters->options().ctors_in_init_array() | |
1204 | && (strcmp(name, ".ctors") == 0 | |
1205 | || strcmp(name, ".dtors") == 0)))) | |
2fd32231 ILT |
1206 | os->set_must_sort_attached_input_sections(); |
1207 | ||
edcac0c1 ILT |
1208 | // By default the GNU linker sorts some special text sections ahead |
1209 | // of others. We are compatible. | |
c6ac678d ST |
1210 | if (parameters->options().text_reorder() |
1211 | && !this->script_options_->saw_sections_clause() | |
7c381248 | 1212 | && !this->is_section_ordering_specified() |
edcac0c1 ILT |
1213 | && !parameters->options().relocatable() |
1214 | && Layout::special_ordering_of_input_section(name) >= 0) | |
1215 | os->set_must_sort_attached_input_sections(); | |
1216 | ||
487b39df ILT |
1217 | // If this is a .ctors or .ctors.* section being mapped to a |
1218 | // .init_array section, or a .dtors or .dtors.* section being mapped | |
1219 | // to a .fini_array section, we will need to reverse the words if | |
1220 | // there is more than one. Record this section for later. See | |
1221 | // ctors_sections_in_init_array above. | |
1222 | if (!this->script_options_->saw_sections_clause() | |
1223 | && !parameters->options().relocatable() | |
1224 | && shdr.get_sh_size() > size / 8 | |
1225 | && (((strcmp(name, ".ctors") == 0 | |
1226 | || is_prefix_of(".ctors.", name)) | |
1227 | && strcmp(os->name(), ".init_array") == 0) | |
1228 | || ((strcmp(name, ".dtors") == 0 | |
1229 | || is_prefix_of(".dtors.", name)) | |
1230 | && strcmp(os->name(), ".fini_array") == 0))) | |
1231 | ctors_sections_in_init_array.insert(Section_id(object, shndx)); | |
1232 | ||
a2fb1b05 ILT |
1233 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
1234 | ||
5b7b7d6e ILT |
1235 | elfcpp::Elf_Xword orig_flags = os->flags(); |
1236 | ||
6e9ba2ca | 1237 | *off = os->add_input_section(this, object, shndx, name, shdr, reloc_shndx, |
a445fddf | 1238 | this->script_options_->saw_sections_clause()); |
5b7b7d6e ILT |
1239 | |
1240 | // If the flags changed, we may have to change the order. | |
1241 | if ((orig_flags & elfcpp::SHF_ALLOC) != 0) | |
1242 | { | |
1243 | orig_flags &= (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
1244 | elfcpp::Elf_Xword new_flags = | |
1245 | os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
1246 | if (orig_flags != new_flags) | |
1247 | os->set_order(this->default_section_order(os, false)); | |
1248 | } | |
1249 | ||
d7bb5745 | 1250 | this->have_added_input_section_ = true; |
a2fb1b05 ILT |
1251 | |
1252 | return os; | |
1253 | } | |
1254 | ||
16164a6b ST |
1255 | // Maps section SECN to SEGMENT s. |
1256 | void | |
1257 | Layout::insert_section_segment_map(Const_section_id secn, | |
1258 | Unique_segment_info *s) | |
1259 | { | |
bbc5ae17 | 1260 | gold_assert(this->unique_segment_for_sections_specified_); |
16164a6b ST |
1261 | this->section_segment_map_[secn] = s; |
1262 | } | |
1263 | ||
6a74a719 ILT |
1264 | // Handle a relocation section when doing a relocatable link. |
1265 | ||
1266 | template<int size, bool big_endian> | |
1267 | Output_section* | |
6fa2a40b | 1268 | Layout::layout_reloc(Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
1269 | unsigned int, |
1270 | const elfcpp::Shdr<size, big_endian>& shdr, | |
1271 | Output_section* data_section, | |
1272 | Relocatable_relocs* rr) | |
1273 | { | |
8851ecca ILT |
1274 | gold_assert(parameters->options().relocatable() |
1275 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
1276 | |
1277 | int sh_type = shdr.get_sh_type(); | |
1278 | ||
1279 | std::string name; | |
1280 | if (sh_type == elfcpp::SHT_REL) | |
1281 | name = ".rel"; | |
1282 | else if (sh_type == elfcpp::SHT_RELA) | |
1283 | name = ".rela"; | |
1284 | else | |
1285 | gold_unreachable(); | |
1286 | name += data_section->name(); | |
1287 | ||
bd288ea2 ILT |
1288 | // In a relocatable link relocs for a grouped section must not be |
1289 | // combined with other reloc sections. | |
1290 | Output_section* os; | |
1291 | if (!parameters->options().relocatable() | |
1292 | || (data_section->flags() & elfcpp::SHF_GROUP) == 0) | |
1293 | os = this->choose_output_section(object, name.c_str(), sh_type, | |
22f0da72 ILT |
1294 | shdr.get_sh_flags(), false, |
1295 | ORDER_INVALID, false); | |
bd288ea2 ILT |
1296 | else |
1297 | { | |
1298 | const char* n = this->namepool_.add(name.c_str(), true, NULL); | |
1299 | os = this->make_output_section(n, sh_type, shdr.get_sh_flags(), | |
22f0da72 | 1300 | ORDER_INVALID, false); |
bd288ea2 | 1301 | } |
6a74a719 ILT |
1302 | |
1303 | os->set_should_link_to_symtab(); | |
1304 | os->set_info_section(data_section); | |
1305 | ||
1306 | Output_section_data* posd; | |
1307 | if (sh_type == elfcpp::SHT_REL) | |
1308 | { | |
1309 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); | |
1310 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, | |
1311 | size, | |
1312 | big_endian>(rr); | |
1313 | } | |
1314 | else if (sh_type == elfcpp::SHT_RELA) | |
1315 | { | |
1316 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); | |
1317 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, | |
1318 | size, | |
1319 | big_endian>(rr); | |
1320 | } | |
1321 | else | |
1322 | gold_unreachable(); | |
1323 | ||
1324 | os->add_output_section_data(posd); | |
1325 | rr->set_output_data(posd); | |
1326 | ||
1327 | return os; | |
1328 | } | |
1329 | ||
1330 | // Handle a group section when doing a relocatable link. | |
1331 | ||
1332 | template<int size, bool big_endian> | |
1333 | void | |
1334 | Layout::layout_group(Symbol_table* symtab, | |
6fa2a40b | 1335 | Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
1336 | unsigned int, |
1337 | const char* group_section_name, | |
1338 | const char* signature, | |
1339 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
1340 | elfcpp::Elf_Word flags, |
1341 | std::vector<unsigned int>* shndxes) | |
6a74a719 | 1342 | { |
8851ecca | 1343 | gold_assert(parameters->options().relocatable()); |
6a74a719 ILT |
1344 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
1345 | group_section_name = this->namepool_.add(group_section_name, true, NULL); | |
1346 | Output_section* os = this->make_output_section(group_section_name, | |
1347 | elfcpp::SHT_GROUP, | |
f5c870d2 | 1348 | shdr.get_sh_flags(), |
22f0da72 | 1349 | ORDER_INVALID, false); |
6a74a719 ILT |
1350 | |
1351 | // We need to find a symbol with the signature in the symbol table. | |
755ab8af | 1352 | // If we don't find one now, we need to look again later. |
6a74a719 | 1353 | Symbol* sym = symtab->lookup(signature, NULL); |
755ab8af ILT |
1354 | if (sym != NULL) |
1355 | os->set_info_symndx(sym); | |
1356 | else | |
1357 | { | |
e55bde5e ILT |
1358 | // Reserve some space to minimize reallocations. |
1359 | if (this->group_signatures_.empty()) | |
1360 | this->group_signatures_.reserve(this->number_of_input_files_ * 16); | |
1361 | ||
755ab8af ILT |
1362 | // We will wind up using a symbol whose name is the signature. |
1363 | // So just put the signature in the symbol name pool to save it. | |
1364 | signature = symtab->canonicalize_name(signature); | |
1365 | this->group_signatures_.push_back(Group_signature(os, signature)); | |
1366 | } | |
6a74a719 ILT |
1367 | |
1368 | os->set_should_link_to_symtab(); | |
6a74a719 ILT |
1369 | os->set_entsize(4); |
1370 | ||
1371 | section_size_type entry_count = | |
1372 | convert_to_section_size_type(shdr.get_sh_size() / 4); | |
1373 | Output_section_data* posd = | |
8825ac63 ILT |
1374 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
1375 | shndxes); | |
6a74a719 ILT |
1376 | os->add_output_section_data(posd); |
1377 | } | |
1378 | ||
730cdc88 ILT |
1379 | // Special GNU handling of sections name .eh_frame. They will |
1380 | // normally hold exception frame data as defined by the C++ ABI | |
1381 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
1382 | |
1383 | template<int size, bool big_endian> | |
730cdc88 | 1384 | Output_section* |
6fa2a40b | 1385 | Layout::layout_eh_frame(Sized_relobj_file<size, big_endian>* object, |
730cdc88 ILT |
1386 | const unsigned char* symbols, |
1387 | off_t symbols_size, | |
1388 | const unsigned char* symbol_names, | |
1389 | off_t symbol_names_size, | |
3151305a | 1390 | unsigned int shndx, |
3151305a | 1391 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
1392 | unsigned int reloc_shndx, unsigned int reloc_type, |
1393 | off_t* off) | |
3151305a | 1394 | { |
4d5e4e62 ILT |
1395 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS |
1396 | || shdr.get_sh_type() == elfcpp::SHT_X86_64_UNWIND); | |
1650c4ff | 1397 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 | 1398 | |
07a60597 | 1399 | Output_section* os = this->make_eh_frame_section(object); |
a445fddf ILT |
1400 | if (os == NULL) |
1401 | return NULL; | |
730cdc88 | 1402 | |
3151305a ILT |
1403 | gold_assert(this->eh_frame_section_ == os); |
1404 | ||
911a5072 ILT |
1405 | elfcpp::Elf_Xword orig_flags = os->flags(); |
1406 | ||
cdc29364 CC |
1407 | if (!parameters->incremental() |
1408 | && this->eh_frame_data_->add_ehframe_input_section(object, | |
1409 | symbols, | |
1410 | symbols_size, | |
1411 | symbol_names, | |
1412 | symbol_names_size, | |
1413 | shndx, | |
1414 | reloc_shndx, | |
1415 | reloc_type)) | |
2c38906f | 1416 | { |
154e0e9a ILT |
1417 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
1418 | ||
3bb951e5 | 1419 | // A writable .eh_frame section is a RELRO section. |
911a5072 ILT |
1420 | if ((orig_flags & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR)) |
1421 | != (os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR))) | |
1422 | { | |
1423 | os->set_is_relro(); | |
1424 | os->set_order(ORDER_RELRO); | |
1425 | } | |
3bb951e5 | 1426 | |
2c38906f ILT |
1427 | // We found a .eh_frame section we are going to optimize, so now |
1428 | // we can add the set of optimized sections to the output | |
1429 | // section. We need to postpone adding this until we've found a | |
1430 | // section we can optimize so that the .eh_frame section in | |
1431 | // crtbegin.o winds up at the start of the output section. | |
1432 | if (!this->added_eh_frame_data_) | |
1433 | { | |
1434 | os->add_output_section_data(this->eh_frame_data_); | |
1435 | this->added_eh_frame_data_ = true; | |
1436 | } | |
1437 | *off = -1; | |
1438 | } | |
730cdc88 ILT |
1439 | else |
1440 | { | |
1441 | // We couldn't handle this .eh_frame section for some reason. | |
1442 | // Add it as a normal section. | |
a445fddf | 1443 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); |
07a60597 ILT |
1444 | *off = os->add_input_section(this, object, shndx, ".eh_frame", shdr, |
1445 | reloc_shndx, saw_sections_clause); | |
d7bb5745 | 1446 | this->have_added_input_section_ = true; |
911a5072 ILT |
1447 | |
1448 | if ((orig_flags & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR)) | |
1449 | != (os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR))) | |
1450 | os->set_order(this->default_section_order(os, false)); | |
730cdc88 ILT |
1451 | } |
1452 | ||
1453 | return os; | |
3151305a ILT |
1454 | } |
1455 | ||
07a60597 ILT |
1456 | // Create and return the magic .eh_frame section. Create |
1457 | // .eh_frame_hdr also if appropriate. OBJECT is the object with the | |
1458 | // input .eh_frame section; it may be NULL. | |
1459 | ||
1460 | Output_section* | |
1461 | Layout::make_eh_frame_section(const Relobj* object) | |
1462 | { | |
1463 | // FIXME: On x86_64, this could use SHT_X86_64_UNWIND rather than | |
1464 | // SHT_PROGBITS. | |
1465 | Output_section* os = this->choose_output_section(object, ".eh_frame", | |
1466 | elfcpp::SHT_PROGBITS, | |
1467 | elfcpp::SHF_ALLOC, false, | |
1468 | ORDER_EHFRAME, false); | |
1469 | if (os == NULL) | |
1470 | return NULL; | |
1471 | ||
1472 | if (this->eh_frame_section_ == NULL) | |
1473 | { | |
1474 | this->eh_frame_section_ = os; | |
1475 | this->eh_frame_data_ = new Eh_frame(); | |
1476 | ||
1477 | // For incremental linking, we do not optimize .eh_frame sections | |
1478 | // or create a .eh_frame_hdr section. | |
1479 | if (parameters->options().eh_frame_hdr() && !parameters->incremental()) | |
1480 | { | |
1481 | Output_section* hdr_os = | |
1482 | this->choose_output_section(NULL, ".eh_frame_hdr", | |
1483 | elfcpp::SHT_PROGBITS, | |
1484 | elfcpp::SHF_ALLOC, false, | |
1485 | ORDER_EHFRAME, false); | |
1486 | ||
1487 | if (hdr_os != NULL) | |
1488 | { | |
1489 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, | |
1490 | this->eh_frame_data_); | |
1491 | hdr_os->add_output_section_data(hdr_posd); | |
1492 | ||
1493 | hdr_os->set_after_input_sections(); | |
1494 | ||
1495 | if (!this->script_options_->saw_phdrs_clause()) | |
1496 | { | |
1497 | Output_segment* hdr_oseg; | |
1498 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, | |
1499 | elfcpp::PF_R); | |
1500 | hdr_oseg->add_output_section_to_nonload(hdr_os, | |
1501 | elfcpp::PF_R); | |
1502 | } | |
1503 | ||
1504 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); | |
1505 | } | |
1506 | } | |
1507 | } | |
1508 | ||
1509 | return os; | |
1510 | } | |
1511 | ||
1512 | // Add an exception frame for a PLT. This is called from target code. | |
1513 | ||
1514 | void | |
1515 | Layout::add_eh_frame_for_plt(Output_data* plt, const unsigned char* cie_data, | |
1516 | size_t cie_length, const unsigned char* fde_data, | |
1517 | size_t fde_length) | |
1518 | { | |
1519 | if (parameters->incremental()) | |
1520 | { | |
1521 | // FIXME: Maybe this could work some day.... | |
1522 | return; | |
1523 | } | |
1524 | Output_section* os = this->make_eh_frame_section(NULL); | |
1525 | if (os == NULL) | |
1526 | return; | |
1527 | this->eh_frame_data_->add_ehframe_for_plt(plt, cie_data, cie_length, | |
1528 | fde_data, fde_length); | |
1529 | if (!this->added_eh_frame_data_) | |
1530 | { | |
1531 | os->add_output_section_data(this->eh_frame_data_); | |
1532 | this->added_eh_frame_data_ = true; | |
1533 | } | |
1534 | } | |
1535 | ||
c1027032 CC |
1536 | // Scan a .debug_info or .debug_types section, and add summary |
1537 | // information to the .gdb_index section. | |
1538 | ||
1539 | template<int size, bool big_endian> | |
1540 | void | |
1541 | Layout::add_to_gdb_index(bool is_type_unit, | |
1542 | Sized_relobj<size, big_endian>* object, | |
1543 | const unsigned char* symbols, | |
1544 | off_t symbols_size, | |
1545 | unsigned int shndx, | |
1546 | unsigned int reloc_shndx, | |
1547 | unsigned int reloc_type) | |
1548 | { | |
1549 | if (this->gdb_index_data_ == NULL) | |
1550 | { | |
1551 | Output_section* os = this->choose_output_section(NULL, ".gdb_index", | |
1552 | elfcpp::SHT_PROGBITS, 0, | |
1553 | false, ORDER_INVALID, | |
1554 | false); | |
1555 | if (os == NULL) | |
2e702c99 | 1556 | return; |
c1027032 CC |
1557 | |
1558 | this->gdb_index_data_ = new Gdb_index(os); | |
1559 | os->add_output_section_data(this->gdb_index_data_); | |
1560 | os->set_after_input_sections(); | |
1561 | } | |
1562 | ||
1563 | this->gdb_index_data_->scan_debug_info(is_type_unit, object, symbols, | |
1564 | symbols_size, shndx, reloc_shndx, | |
1565 | reloc_type); | |
1566 | } | |
1567 | ||
9f1d377b ILT |
1568 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
1569 | // the output section. | |
ead1e424 | 1570 | |
9f1d377b | 1571 | Output_section* |
ead1e424 ILT |
1572 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
1573 | elfcpp::Elf_Xword flags, | |
f5c870d2 | 1574 | Output_section_data* posd, |
22f0da72 | 1575 | Output_section_order order, bool is_relro) |
ead1e424 | 1576 | { |
a445fddf | 1577 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
22f0da72 | 1578 | false, order, is_relro); |
a445fddf ILT |
1579 | if (os != NULL) |
1580 | os->add_output_section_data(posd); | |
9f1d377b | 1581 | return os; |
ead1e424 ILT |
1582 | } |
1583 | ||
a2fb1b05 ILT |
1584 | // Map section flags to segment flags. |
1585 | ||
1586 | elfcpp::Elf_Word | |
1587 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
1588 | { | |
1589 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
1590 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
1591 | ret |= elfcpp::PF_W; | |
1592 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
1593 | ret |= elfcpp::PF_X; | |
1594 | return ret; | |
1595 | } | |
1596 | ||
1597 | // Make a new Output_section, and attach it to segments as | |
22f0da72 ILT |
1598 | // appropriate. ORDER is the order in which this section should |
1599 | // appear in the output segment. IS_RELRO is true if this is a relro | |
1600 | // (read-only after relocations) section. | |
a2fb1b05 ILT |
1601 | |
1602 | Output_section* | |
1603 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
22f0da72 ILT |
1604 | elfcpp::Elf_Xword flags, |
1605 | Output_section_order order, bool is_relro) | |
a2fb1b05 | 1606 | { |
96803768 ILT |
1607 | Output_section* os; |
1608 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 1609 | && strcmp(parameters->options().compress_debug_sections(), "none") != 0 |
96803768 | 1610 | && is_compressible_debug_section(name)) |
e55bde5e ILT |
1611 | os = new Output_compressed_section(¶meters->options(), name, type, |
1612 | flags); | |
62b01cb5 | 1613 | else if ((flags & elfcpp::SHF_ALLOC) == 0 |
2e702c99 RM |
1614 | && parameters->options().strip_debug_non_line() |
1615 | && strcmp(".debug_abbrev", name) == 0) | |
62b01cb5 ILT |
1616 | { |
1617 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( | |
2e702c99 | 1618 | name, type, flags); |
62b01cb5 | 1619 | if (this->debug_info_) |
2e702c99 | 1620 | this->debug_info_->set_abbreviations(this->debug_abbrev_); |
62b01cb5 ILT |
1621 | } |
1622 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
2e702c99 RM |
1623 | && parameters->options().strip_debug_non_line() |
1624 | && strcmp(".debug_info", name) == 0) | |
62b01cb5 ILT |
1625 | { |
1626 | os = this->debug_info_ = new Output_reduced_debug_info_section( | |
2e702c99 | 1627 | name, type, flags); |
62b01cb5 | 1628 | if (this->debug_abbrev_) |
2e702c99 | 1629 | this->debug_info_->set_abbreviations(this->debug_abbrev_); |
62b01cb5 | 1630 | } |
09ec0418 | 1631 | else |
c0a62865 | 1632 | { |
5393d741 ILT |
1633 | // Sometimes .init_array*, .preinit_array* and .fini_array* do |
1634 | // not have correct section types. Force them here. | |
1635 | if (type == elfcpp::SHT_PROGBITS) | |
1636 | { | |
1637 | if (is_prefix_of(".init_array", name)) | |
1638 | type = elfcpp::SHT_INIT_ARRAY; | |
1639 | else if (is_prefix_of(".preinit_array", name)) | |
1640 | type = elfcpp::SHT_PREINIT_ARRAY; | |
1641 | else if (is_prefix_of(".fini_array", name)) | |
1642 | type = elfcpp::SHT_FINI_ARRAY; | |
1643 | } | |
1644 | ||
c0a62865 DK |
1645 | // FIXME: const_cast is ugly. |
1646 | Target* target = const_cast<Target*>(¶meters->target()); | |
1647 | os = target->make_output_section(name, type, flags); | |
1648 | } | |
96803768 | 1649 | |
22f0da72 ILT |
1650 | // With -z relro, we have to recognize the special sections by name. |
1651 | // There is no other way. | |
1652 | bool is_relro_local = false; | |
1653 | if (!this->script_options_->saw_sections_clause() | |
1654 | && parameters->options().relro() | |
22f0da72 ILT |
1655 | && (flags & elfcpp::SHF_ALLOC) != 0 |
1656 | && (flags & elfcpp::SHF_WRITE) != 0) | |
1657 | { | |
14dc9ef7 | 1658 | if (type == elfcpp::SHT_PROGBITS) |
22f0da72 | 1659 | { |
1007b503 CC |
1660 | if ((flags & elfcpp::SHF_TLS) != 0) |
1661 | is_relro = true; | |
1662 | else if (strcmp(name, ".data.rel.ro") == 0) | |
14dc9ef7 ILT |
1663 | is_relro = true; |
1664 | else if (strcmp(name, ".data.rel.ro.local") == 0) | |
1665 | { | |
1666 | is_relro = true; | |
1667 | is_relro_local = true; | |
1668 | } | |
1669 | else if (strcmp(name, ".ctors") == 0 | |
1670 | || strcmp(name, ".dtors") == 0 | |
1671 | || strcmp(name, ".jcr") == 0) | |
1672 | is_relro = true; | |
22f0da72 ILT |
1673 | } |
1674 | else if (type == elfcpp::SHT_INIT_ARRAY | |
1675 | || type == elfcpp::SHT_FINI_ARRAY | |
1676 | || type == elfcpp::SHT_PREINIT_ARRAY) | |
1677 | is_relro = true; | |
22f0da72 ILT |
1678 | } |
1679 | ||
1a2dff53 ILT |
1680 | if (is_relro) |
1681 | os->set_is_relro(); | |
22f0da72 ILT |
1682 | |
1683 | if (order == ORDER_INVALID && (flags & elfcpp::SHF_ALLOC) != 0) | |
1684 | order = this->default_section_order(os, is_relro_local); | |
1685 | ||
1686 | os->set_order(order); | |
f5c870d2 | 1687 | |
8a5e3e08 ILT |
1688 | parameters->target().new_output_section(os); |
1689 | ||
a3ad94ed | 1690 | this->section_list_.push_back(os); |
a2fb1b05 | 1691 | |
2fd32231 ILT |
1692 | // The GNU linker by default sorts some sections by priority, so we |
1693 | // do the same. We need to know that this might happen before we | |
1694 | // attach any input sections. | |
1695 | if (!this->script_options_->saw_sections_clause() | |
5393d741 ILT |
1696 | && !parameters->options().relocatable() |
1697 | && (strcmp(name, ".init_array") == 0 | |
1698 | || strcmp(name, ".fini_array") == 0 | |
1699 | || (!parameters->options().ctors_in_init_array() | |
1700 | && (strcmp(name, ".ctors") == 0 | |
1701 | || strcmp(name, ".dtors") == 0)))) | |
2fd32231 ILT |
1702 | os->set_may_sort_attached_input_sections(); |
1703 | ||
edcac0c1 ILT |
1704 | // The GNU linker by default sorts .text.{unlikely,exit,startup,hot} |
1705 | // sections before other .text sections. We are compatible. We | |
1706 | // need to know that this might happen before we attach any input | |
1707 | // sections. | |
c6ac678d ST |
1708 | if (parameters->options().text_reorder() |
1709 | && !this->script_options_->saw_sections_clause() | |
7c381248 | 1710 | && !this->is_section_ordering_specified() |
edcac0c1 ILT |
1711 | && !parameters->options().relocatable() |
1712 | && strcmp(name, ".text") == 0) | |
1713 | os->set_may_sort_attached_input_sections(); | |
1714 | ||
6934001a CC |
1715 | // GNU linker sorts section by name with --sort-section=name. |
1716 | if (strcmp(parameters->options().sort_section(), "name") == 0) | |
1717 | os->set_must_sort_attached_input_sections(); | |
1718 | ||
1518dc8f ILT |
1719 | // Check for .stab*str sections, as .stab* sections need to link to |
1720 | // them. | |
1721 | if (type == elfcpp::SHT_STRTAB | |
1722 | && !this->have_stabstr_section_ | |
1723 | && strncmp(name, ".stab", 5) == 0 | |
1724 | && strcmp(name + strlen(name) - 3, "str") == 0) | |
1725 | this->have_stabstr_section_ = true; | |
1726 | ||
9fbd3822 CC |
1727 | // During a full incremental link, we add patch space to most |
1728 | // PROGBITS and NOBITS sections. Flag those that may be | |
1729 | // arbitrarily padded. | |
1730 | if ((type == elfcpp::SHT_PROGBITS || type == elfcpp::SHT_NOBITS) | |
1731 | && order != ORDER_INTERP | |
1732 | && order != ORDER_INIT | |
1733 | && order != ORDER_PLT | |
1734 | && order != ORDER_FINI | |
1735 | && order != ORDER_RELRO_LAST | |
1736 | && order != ORDER_NON_RELRO_FIRST | |
aa06ae28 | 1737 | && strcmp(name, ".eh_frame") != 0 |
9fbd3822 CC |
1738 | && strcmp(name, ".ctors") != 0 |
1739 | && strcmp(name, ".dtors") != 0 | |
1740 | && strcmp(name, ".jcr") != 0) | |
8ea8cd50 CC |
1741 | { |
1742 | os->set_is_patch_space_allowed(); | |
1743 | ||
1744 | // Certain sections require "holes" to be filled with | |
1745 | // specific fill patterns. These fill patterns may have | |
1746 | // a minimum size, so we must prevent allocations from the | |
1747 | // free list that leave a hole smaller than the minimum. | |
1748 | if (strcmp(name, ".debug_info") == 0) | |
2e702c99 | 1749 | os->set_free_space_fill(new Output_fill_debug_info(false)); |
8ea8cd50 | 1750 | else if (strcmp(name, ".debug_types") == 0) |
2e702c99 | 1751 | os->set_free_space_fill(new Output_fill_debug_info(true)); |
8ea8cd50 | 1752 | else if (strcmp(name, ".debug_line") == 0) |
2e702c99 | 1753 | os->set_free_space_fill(new Output_fill_debug_line()); |
8ea8cd50 | 1754 | } |
9fbd3822 | 1755 | |
154e0e9a ILT |
1756 | // If we have already attached the sections to segments, then we |
1757 | // need to attach this one now. This happens for sections created | |
1758 | // directly by the linker. | |
1759 | if (this->sections_are_attached_) | |
2e702c99 | 1760 | this->attach_section_to_segment(¶meters->target(), os); |
154e0e9a | 1761 | |
4e2b1697 ILT |
1762 | return os; |
1763 | } | |
a445fddf | 1764 | |
22f0da72 ILT |
1765 | // Return the default order in which a section should be placed in an |
1766 | // output segment. This function captures a lot of the ideas in | |
1767 | // ld/scripttempl/elf.sc in the GNU linker. Note that the order of a | |
1768 | // linker created section is normally set when the section is created; | |
1769 | // this function is used for input sections. | |
1770 | ||
1771 | Output_section_order | |
1772 | Layout::default_section_order(Output_section* os, bool is_relro_local) | |
1773 | { | |
1774 | gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0); | |
1775 | bool is_write = (os->flags() & elfcpp::SHF_WRITE) != 0; | |
1776 | bool is_execinstr = (os->flags() & elfcpp::SHF_EXECINSTR) != 0; | |
1777 | bool is_bss = false; | |
1778 | ||
1779 | switch (os->type()) | |
1780 | { | |
1781 | default: | |
1782 | case elfcpp::SHT_PROGBITS: | |
1783 | break; | |
1784 | case elfcpp::SHT_NOBITS: | |
1785 | is_bss = true; | |
1786 | break; | |
1787 | case elfcpp::SHT_RELA: | |
1788 | case elfcpp::SHT_REL: | |
1789 | if (!is_write) | |
1790 | return ORDER_DYNAMIC_RELOCS; | |
1791 | break; | |
1792 | case elfcpp::SHT_HASH: | |
1793 | case elfcpp::SHT_DYNAMIC: | |
1794 | case elfcpp::SHT_SHLIB: | |
1795 | case elfcpp::SHT_DYNSYM: | |
1796 | case elfcpp::SHT_GNU_HASH: | |
1797 | case elfcpp::SHT_GNU_verdef: | |
1798 | case elfcpp::SHT_GNU_verneed: | |
1799 | case elfcpp::SHT_GNU_versym: | |
1800 | if (!is_write) | |
1801 | return ORDER_DYNAMIC_LINKER; | |
1802 | break; | |
1803 | case elfcpp::SHT_NOTE: | |
1804 | return is_write ? ORDER_RW_NOTE : ORDER_RO_NOTE; | |
1805 | } | |
1806 | ||
1807 | if ((os->flags() & elfcpp::SHF_TLS) != 0) | |
1808 | return is_bss ? ORDER_TLS_BSS : ORDER_TLS_DATA; | |
1809 | ||
1810 | if (!is_bss && !is_write) | |
1811 | { | |
1812 | if (is_execinstr) | |
1813 | { | |
1814 | if (strcmp(os->name(), ".init") == 0) | |
1815 | return ORDER_INIT; | |
1816 | else if (strcmp(os->name(), ".fini") == 0) | |
1817 | return ORDER_FINI; | |
1818 | } | |
1819 | return is_execinstr ? ORDER_TEXT : ORDER_READONLY; | |
1820 | } | |
1821 | ||
1822 | if (os->is_relro()) | |
1823 | return is_relro_local ? ORDER_RELRO_LOCAL : ORDER_RELRO; | |
1824 | ||
1825 | if (os->is_small_section()) | |
1826 | return is_bss ? ORDER_SMALL_BSS : ORDER_SMALL_DATA; | |
1827 | if (os->is_large_section()) | |
1828 | return is_bss ? ORDER_LARGE_BSS : ORDER_LARGE_DATA; | |
1829 | ||
1830 | return is_bss ? ORDER_BSS : ORDER_DATA; | |
1831 | } | |
1832 | ||
154e0e9a ILT |
1833 | // Attach output sections to segments. This is called after we have |
1834 | // seen all the input sections. | |
1835 | ||
1836 | void | |
2e702c99 | 1837 | Layout::attach_sections_to_segments(const Target* target) |
154e0e9a ILT |
1838 | { |
1839 | for (Section_list::iterator p = this->section_list_.begin(); | |
1840 | p != this->section_list_.end(); | |
1841 | ++p) | |
2e702c99 | 1842 | this->attach_section_to_segment(target, *p); |
154e0e9a ILT |
1843 | |
1844 | this->sections_are_attached_ = true; | |
1845 | } | |
1846 | ||
1847 | // Attach an output section to a segment. | |
1848 | ||
1849 | void | |
2e702c99 | 1850 | Layout::attach_section_to_segment(const Target* target, Output_section* os) |
154e0e9a ILT |
1851 | { |
1852 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
1853 | this->unattached_section_list_.push_back(os); | |
1854 | else | |
2e702c99 | 1855 | this->attach_allocated_section_to_segment(target, os); |
154e0e9a ILT |
1856 | } |
1857 | ||
4e2b1697 | 1858 | // Attach an allocated output section to a segment. |
1c4f3631 | 1859 | |
4e2b1697 | 1860 | void |
2e702c99 RM |
1861 | Layout::attach_allocated_section_to_segment(const Target* target, |
1862 | Output_section* os) | |
4e2b1697 | 1863 | { |
154e0e9a | 1864 | elfcpp::Elf_Xword flags = os->flags(); |
4e2b1697 | 1865 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
a2fb1b05 | 1866 | |
4e2b1697 ILT |
1867 | if (parameters->options().relocatable()) |
1868 | return; | |
a2fb1b05 | 1869 | |
4e2b1697 ILT |
1870 | // If we have a SECTIONS clause, we can't handle the attachment to |
1871 | // segments until after we've seen all the sections. | |
1872 | if (this->script_options_->saw_sections_clause()) | |
1873 | return; | |
a2fb1b05 | 1874 | |
4e2b1697 | 1875 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
756ac4a8 | 1876 | |
4e2b1697 | 1877 | // This output section goes into a PT_LOAD segment. |
a2fb1b05 | 1878 | |
4e2b1697 | 1879 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
a2fb1b05 | 1880 | |
16164a6b ST |
1881 | // If this output section's segment has extra flags that need to be set, |
1882 | // coming from a linker plugin, do that. | |
1883 | seg_flags |= os->extra_segment_flags(); | |
1884 | ||
a192ba05 ILT |
1885 | // Check for --section-start. |
1886 | uint64_t addr; | |
1887 | bool is_address_set = parameters->options().section_start(os->name(), &addr); | |
f5c870d2 | 1888 | |
4e2b1697 | 1889 | // In general the only thing we really care about for PT_LOAD |
0f72bf6f RÁE |
1890 | // segments is whether or not they are writable or executable, |
1891 | // so that is how we search for them. | |
1892 | // Large data sections also go into their own PT_LOAD segment. | |
1893 | // People who need segments sorted on some other basis will | |
1894 | // have to use a linker script. | |
a2fb1b05 | 1895 | |
4e2b1697 | 1896 | Segment_list::const_iterator p; |
16164a6b | 1897 | if (!os->is_unique_segment()) |
4e2b1697 | 1898 | { |
16164a6b | 1899 | for (p = this->segment_list_.begin(); |
bbc5ae17 | 1900 | p != this->segment_list_.end(); |
16164a6b | 1901 | ++p) |
a192ba05 | 1902 | { |
bbc5ae17 RM |
1903 | if ((*p)->type() != elfcpp::PT_LOAD) |
1904 | continue; | |
1905 | if ((*p)->is_unique_segment()) | |
1906 | continue; | |
1907 | if (!parameters->options().omagic() | |
1908 | && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W)) | |
1909 | continue; | |
1910 | if ((target->isolate_execinstr() || parameters->options().rosegment()) | |
1911 | && ((*p)->flags() & elfcpp::PF_X) != (seg_flags & elfcpp::PF_X)) | |
1912 | continue; | |
1913 | // If -Tbss was specified, we need to separate the data and BSS | |
1914 | // segments. | |
1915 | if (parameters->options().user_set_Tbss()) | |
1916 | { | |
1917 | if ((os->type() == elfcpp::SHT_NOBITS) | |
1918 | == (*p)->has_any_data_sections()) | |
1919 | continue; | |
1920 | } | |
1921 | if (os->is_large_data_section() && !(*p)->is_large_data_segment()) | |
1922 | continue; | |
1923 | ||
1924 | if (is_address_set) | |
1925 | { | |
1926 | if ((*p)->are_addresses_set()) | |
1927 | continue; | |
1928 | ||
1929 | (*p)->add_initial_output_data(os); | |
1930 | (*p)->update_flags_for_output_section(seg_flags); | |
1931 | (*p)->set_addresses(addr, addr); | |
1932 | break; | |
1933 | } | |
1934 | ||
1935 | (*p)->add_output_section_to_load(this, os, seg_flags); | |
1936 | break; | |
1937 | } | |
16164a6b ST |
1938 | } |
1939 | ||
1940 | if (p == this->segment_list_.end() | |
1941 | || os->is_unique_segment()) | |
4e2b1697 ILT |
1942 | { |
1943 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, | |
2e702c99 | 1944 | seg_flags); |
8a5e3e08 ILT |
1945 | if (os->is_large_data_section()) |
1946 | oseg->set_is_large_data_segment(); | |
22f0da72 | 1947 | oseg->add_output_section_to_load(this, os, seg_flags); |
a192ba05 ILT |
1948 | if (is_address_set) |
1949 | oseg->set_addresses(addr, addr); | |
16164a6b ST |
1950 | // Check if segment should be marked unique. For segments marked |
1951 | // unique by linker plugins, set the new alignment if specified. | |
1952 | if (os->is_unique_segment()) | |
1953 | { | |
1954 | oseg->set_is_unique_segment(); | |
1955 | if (os->segment_alignment() != 0) | |
1956 | oseg->set_minimum_p_align(os->segment_alignment()); | |
1957 | } | |
a2fb1b05 ILT |
1958 | } |
1959 | ||
4e2b1697 ILT |
1960 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
1961 | // segment. | |
1962 | if (os->type() == elfcpp::SHT_NOTE) | |
1963 | { | |
1964 | // See if we already have an equivalent PT_NOTE segment. | |
1965 | for (p = this->segment_list_.begin(); | |
2e702c99 RM |
1966 | p != segment_list_.end(); |
1967 | ++p) | |
1968 | { | |
1969 | if ((*p)->type() == elfcpp::PT_NOTE | |
1970 | && (((*p)->flags() & elfcpp::PF_W) | |
1971 | == (seg_flags & elfcpp::PF_W))) | |
1972 | { | |
1973 | (*p)->add_output_section_to_nonload(os, seg_flags); | |
1974 | break; | |
1975 | } | |
1976 | } | |
4e2b1697 ILT |
1977 | |
1978 | if (p == this->segment_list_.end()) | |
2e702c99 RM |
1979 | { |
1980 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, | |
1981 | seg_flags); | |
1982 | oseg->add_output_section_to_nonload(os, seg_flags); | |
1983 | } | |
4e2b1697 ILT |
1984 | } |
1985 | ||
1986 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
1987 | // segment. There can only be one such segment. | |
1988 | if ((flags & elfcpp::SHF_TLS) != 0) | |
1989 | { | |
1990 | if (this->tls_segment_ == NULL) | |
2d924fd9 | 1991 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
22f0da72 | 1992 | this->tls_segment_->add_output_section_to_nonload(os, seg_flags); |
4e2b1697 | 1993 | } |
9f1d377b ILT |
1994 | |
1995 | // If -z relro is in effect, and we see a relro section, we create a | |
1996 | // PT_GNU_RELRO segment. There can only be one such segment. | |
1997 | if (os->is_relro() && parameters->options().relro()) | |
1998 | { | |
1999 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); | |
2000 | if (this->relro_segment_ == NULL) | |
2d924fd9 | 2001 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
22f0da72 | 2002 | this->relro_segment_->add_output_section_to_nonload(os, seg_flags); |
9f1d377b | 2003 | } |
10b4f102 | 2004 | |
e1f74f98 ILT |
2005 | // If we see a section named .interp, put it into a PT_INTERP |
2006 | // segment. This seems broken to me, but this is what GNU ld does, | |
2007 | // and glibc expects it. | |
10b4f102 | 2008 | if (strcmp(os->name(), ".interp") == 0 |
e1f74f98 | 2009 | && !this->script_options_->saw_phdrs_clause()) |
10b4f102 ILT |
2010 | { |
2011 | if (this->interp_segment_ == NULL) | |
2012 | this->make_output_segment(elfcpp::PT_INTERP, seg_flags); | |
e1f74f98 ILT |
2013 | else |
2014 | gold_warning(_("multiple '.interp' sections in input files " | |
2015 | "may cause confusing PT_INTERP segment")); | |
10b4f102 ILT |
2016 | this->interp_segment_->add_output_section_to_nonload(os, seg_flags); |
2017 | } | |
a2fb1b05 ILT |
2018 | } |
2019 | ||
919ed24c ILT |
2020 | // Make an output section for a script. |
2021 | ||
2022 | Output_section* | |
1e5d2fb1 DK |
2023 | Layout::make_output_section_for_script( |
2024 | const char* name, | |
2025 | Script_sections::Section_type section_type) | |
919ed24c ILT |
2026 | { |
2027 | name = this->namepool_.add(name, false, NULL); | |
1e5d2fb1 DK |
2028 | elfcpp::Elf_Xword sh_flags = elfcpp::SHF_ALLOC; |
2029 | if (section_type == Script_sections::ST_NOLOAD) | |
2030 | sh_flags = 0; | |
919ed24c | 2031 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, |
22f0da72 ILT |
2032 | sh_flags, ORDER_INVALID, |
2033 | false); | |
919ed24c | 2034 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
2035 | if (section_type == Script_sections::ST_NOLOAD) |
2036 | os->set_is_noload(); | |
919ed24c ILT |
2037 | return os; |
2038 | } | |
2039 | ||
3802b2dd ILT |
2040 | // Return the number of segments we expect to see. |
2041 | ||
2042 | size_t | |
2043 | Layout::expected_segment_count() const | |
2044 | { | |
2045 | size_t ret = this->segment_list_.size(); | |
2046 | ||
2047 | // If we didn't see a SECTIONS clause in a linker script, we should | |
2048 | // already have the complete list of segments. Otherwise we ask the | |
2049 | // SECTIONS clause how many segments it expects, and add in the ones | |
2050 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) | |
2051 | ||
2052 | if (!this->script_options_->saw_sections_clause()) | |
2053 | return ret; | |
2054 | else | |
2055 | { | |
2056 | const Script_sections* ss = this->script_options_->script_sections(); | |
2057 | return ret + ss->expected_segment_count(this); | |
2058 | } | |
2059 | } | |
2060 | ||
35cdfc9a ILT |
2061 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
2062 | // is whether we saw a .note.GNU-stack section in the object file. | |
2063 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
2064 | // protection required for stack memory. We record this in an | |
2065 | // executable as a PT_GNU_STACK segment. If an object file does not | |
2066 | // have a .note.GNU-stack segment, we must assume that it is an old | |
2067 | // object. On some targets that will force an executable stack. | |
2068 | ||
2069 | void | |
83e17bd5 CC |
2070 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags, |
2071 | const Object* obj) | |
35cdfc9a ILT |
2072 | { |
2073 | if (!seen_gnu_stack) | |
83e17bd5 CC |
2074 | { |
2075 | this->input_without_gnu_stack_note_ = true; | |
2076 | if (parameters->options().warn_execstack() | |
2077 | && parameters->target().is_default_stack_executable()) | |
2078 | gold_warning(_("%s: missing .note.GNU-stack section" | |
2079 | " implies executable stack"), | |
2080 | obj->name().c_str()); | |
2081 | } | |
35cdfc9a ILT |
2082 | else |
2083 | { | |
2084 | this->input_with_gnu_stack_note_ = true; | |
2085 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
83e17bd5 CC |
2086 | { |
2087 | this->input_requires_executable_stack_ = true; | |
2088 | if (parameters->options().warn_execstack() | |
2089 | || parameters->options().is_stack_executable()) | |
2090 | gold_warning(_("%s: requires executable stack"), | |
2091 | obj->name().c_str()); | |
2092 | } | |
35cdfc9a ILT |
2093 | } |
2094 | } | |
2095 | ||
9c547ec3 ILT |
2096 | // Create automatic note sections. |
2097 | ||
2098 | void | |
2099 | Layout::create_notes() | |
2100 | { | |
2101 | this->create_gold_note(); | |
2102 | this->create_executable_stack_info(); | |
2103 | this->create_build_id(); | |
2104 | } | |
2105 | ||
a3ad94ed ILT |
2106 | // Create the dynamic sections which are needed before we read the |
2107 | // relocs. | |
2108 | ||
2109 | void | |
9b07f471 | 2110 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
a3ad94ed | 2111 | { |
436ca963 | 2112 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
2113 | return; |
2114 | ||
3802b2dd ILT |
2115 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
2116 | elfcpp::SHT_DYNAMIC, | |
2117 | (elfcpp::SHF_ALLOC | |
2118 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
2119 | false, ORDER_RELRO, |
2120 | true); | |
a3ad94ed | 2121 | |
6daf5215 ILT |
2122 | // A linker script may discard .dynamic, so check for NULL. |
2123 | if (this->dynamic_section_ != NULL) | |
2124 | { | |
2125 | this->dynamic_symbol_ = | |
2126 | symtab->define_in_output_data("_DYNAMIC", NULL, | |
2127 | Symbol_table::PREDEFINED, | |
2128 | this->dynamic_section_, 0, 0, | |
2129 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, | |
2130 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 2131 | |
6daf5215 | 2132 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 | 2133 | |
6daf5215 ILT |
2134 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); |
2135 | } | |
a3ad94ed ILT |
2136 | } |
2137 | ||
bfd58944 ILT |
2138 | // For each output section whose name can be represented as C symbol, |
2139 | // define __start and __stop symbols for the section. This is a GNU | |
2140 | // extension. | |
2141 | ||
2142 | void | |
9b07f471 | 2143 | Layout::define_section_symbols(Symbol_table* symtab) |
bfd58944 ILT |
2144 | { |
2145 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
2146 | p != this->section_list_.end(); | |
2147 | ++p) | |
2148 | { | |
2149 | const char* const name = (*p)->name(); | |
f1ec9ded | 2150 | if (is_cident(name)) |
bfd58944 ILT |
2151 | { |
2152 | const std::string name_string(name); | |
f1ec9ded | 2153 | const std::string start_name(cident_section_start_prefix |
2e702c99 | 2154 | + name_string); |
f1ec9ded | 2155 | const std::string stop_name(cident_section_stop_prefix |
2e702c99 | 2156 | + name_string); |
bfd58944 | 2157 | |
9b07f471 | 2158 | symtab->define_in_output_data(start_name.c_str(), |
bfd58944 | 2159 | NULL, // version |
99fff23b | 2160 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
2161 | *p, |
2162 | 0, // value | |
2163 | 0, // symsize | |
2164 | elfcpp::STT_NOTYPE, | |
2165 | elfcpp::STB_GLOBAL, | |
2166 | elfcpp::STV_DEFAULT, | |
2167 | 0, // nonvis | |
2168 | false, // offset_is_from_end | |
a445fddf | 2169 | true); // only_if_ref |
bfd58944 | 2170 | |
9b07f471 | 2171 | symtab->define_in_output_data(stop_name.c_str(), |
bfd58944 | 2172 | NULL, // version |
99fff23b | 2173 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
2174 | *p, |
2175 | 0, // value | |
2176 | 0, // symsize | |
2177 | elfcpp::STT_NOTYPE, | |
2178 | elfcpp::STB_GLOBAL, | |
2179 | elfcpp::STV_DEFAULT, | |
2180 | 0, // nonvis | |
2181 | true, // offset_is_from_end | |
a445fddf | 2182 | true); // only_if_ref |
bfd58944 ILT |
2183 | } |
2184 | } | |
2185 | } | |
2186 | ||
755ab8af ILT |
2187 | // Define symbols for group signatures. |
2188 | ||
2189 | void | |
2190 | Layout::define_group_signatures(Symbol_table* symtab) | |
2191 | { | |
2192 | for (Group_signatures::iterator p = this->group_signatures_.begin(); | |
2193 | p != this->group_signatures_.end(); | |
2194 | ++p) | |
2195 | { | |
2196 | Symbol* sym = symtab->lookup(p->signature, NULL); | |
2197 | if (sym != NULL) | |
2198 | p->section->set_info_symndx(sym); | |
2199 | else | |
2200 | { | |
2201 | // Force the name of the group section to the group | |
2202 | // signature, and use the group's section symbol as the | |
2203 | // signature symbol. | |
2204 | if (strcmp(p->section->name(), p->signature) != 0) | |
2205 | { | |
2206 | const char* name = this->namepool_.add(p->signature, | |
2207 | true, NULL); | |
2208 | p->section->set_name(name); | |
2209 | } | |
2210 | p->section->set_needs_symtab_index(); | |
2211 | p->section->set_info_section_symndx(p->section); | |
2212 | } | |
2213 | } | |
2214 | ||
2215 | this->group_signatures_.clear(); | |
2216 | } | |
2217 | ||
75f65a3e ILT |
2218 | // Find the first read-only PT_LOAD segment, creating one if |
2219 | // necessary. | |
54dc6425 | 2220 | |
75f65a3e | 2221 | Output_segment* |
2e702c99 | 2222 | Layout::find_first_load_seg(const Target* target) |
54dc6425 | 2223 | { |
0f72bf6f | 2224 | Output_segment* best = NULL; |
75f65a3e ILT |
2225 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
2226 | p != this->segment_list_.end(); | |
2227 | ++p) | |
2228 | { | |
2229 | if ((*p)->type() == elfcpp::PT_LOAD | |
2230 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
af6156ef | 2231 | && (parameters->options().omagic() |
2e702c99 RM |
2232 | || ((*p)->flags() & elfcpp::PF_W) == 0) |
2233 | && (!target->isolate_execinstr() | |
2234 | || ((*p)->flags() & elfcpp::PF_X) == 0)) | |
2235 | { | |
2236 | if (best == NULL || this->segment_precedes(*p, best)) | |
2237 | best = *p; | |
2238 | } | |
75f65a3e | 2239 | } |
0f72bf6f RÁE |
2240 | if (best != NULL) |
2241 | return best; | |
75f65a3e | 2242 | |
1c4f3631 ILT |
2243 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
2244 | ||
3802b2dd ILT |
2245 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
2246 | elfcpp::PF_R); | |
75f65a3e | 2247 | return load_seg; |
54dc6425 ILT |
2248 | } |
2249 | ||
20e6d0d6 DK |
2250 | // Save states of all current output segments. Store saved states |
2251 | // in SEGMENT_STATES. | |
2252 | ||
2253 | void | |
2254 | Layout::save_segments(Segment_states* segment_states) | |
2255 | { | |
2256 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
2257 | p != this->segment_list_.end(); | |
2258 | ++p) | |
2259 | { | |
2260 | Output_segment* segment = *p; | |
2261 | // Shallow copy. | |
2262 | Output_segment* copy = new Output_segment(*segment); | |
2263 | (*segment_states)[segment] = copy; | |
2264 | } | |
2265 | } | |
2266 | ||
2267 | // Restore states of output segments and delete any segment not found in | |
2268 | // SEGMENT_STATES. | |
2269 | ||
2270 | void | |
2271 | Layout::restore_segments(const Segment_states* segment_states) | |
2272 | { | |
2273 | // Go through the segment list and remove any segment added in the | |
2274 | // relaxation loop. | |
2275 | this->tls_segment_ = NULL; | |
2276 | this->relro_segment_ = NULL; | |
2277 | Segment_list::iterator list_iter = this->segment_list_.begin(); | |
2278 | while (list_iter != this->segment_list_.end()) | |
2279 | { | |
2280 | Output_segment* segment = *list_iter; | |
2281 | Segment_states::const_iterator states_iter = | |
2282 | segment_states->find(segment); | |
2283 | if (states_iter != segment_states->end()) | |
2284 | { | |
2285 | const Output_segment* copy = states_iter->second; | |
2286 | // Shallow copy to restore states. | |
2287 | *segment = *copy; | |
2288 | ||
2289 | // Also fix up TLS and RELRO segment pointers as appropriate. | |
2290 | if (segment->type() == elfcpp::PT_TLS) | |
2291 | this->tls_segment_ = segment; | |
2292 | else if (segment->type() == elfcpp::PT_GNU_RELRO) | |
2293 | this->relro_segment_ = segment; | |
2294 | ||
2295 | ++list_iter; | |
2e702c99 | 2296 | } |
20e6d0d6 DK |
2297 | else |
2298 | { | |
2e702c99 | 2299 | list_iter = this->segment_list_.erase(list_iter); |
20e6d0d6 DK |
2300 | // This is a segment created during section layout. It should be |
2301 | // safe to remove it since we should have removed all pointers to it. | |
2302 | delete segment; | |
2303 | } | |
2304 | } | |
2305 | } | |
2306 | ||
2307 | // Clean up after relaxation so that sections can be laid out again. | |
2308 | ||
2309 | void | |
2310 | Layout::clean_up_after_relaxation() | |
2311 | { | |
2312 | // Restore the segments to point state just prior to the relaxation loop. | |
2313 | Script_sections* script_section = this->script_options_->script_sections(); | |
2314 | script_section->release_segments(); | |
2315 | this->restore_segments(this->segment_states_); | |
2316 | ||
2317 | // Reset section addresses and file offsets | |
2318 | for (Section_list::iterator p = this->section_list_.begin(); | |
2319 | p != this->section_list_.end(); | |
2320 | ++p) | |
2321 | { | |
20e6d0d6 | 2322 | (*p)->restore_states(); |
8923b24c DK |
2323 | |
2324 | // If an input section changes size because of relaxation, | |
2325 | // we need to adjust the section offsets of all input sections. | |
2326 | // after such a section. | |
2327 | if ((*p)->section_offsets_need_adjustment()) | |
2328 | (*p)->adjust_section_offsets(); | |
2329 | ||
2330 | (*p)->reset_address_and_file_offset(); | |
20e6d0d6 | 2331 | } |
2e702c99 | 2332 | |
20e6d0d6 DK |
2333 | // Reset special output object address and file offsets. |
2334 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
2335 | p != this->special_output_list_.end(); | |
2336 | ++p) | |
2337 | (*p)->reset_address_and_file_offset(); | |
2338 | ||
2339 | // A linker script may have created some output section data objects. | |
2340 | // They are useless now. | |
2341 | for (Output_section_data_list::const_iterator p = | |
2342 | this->script_output_section_data_list_.begin(); | |
2343 | p != this->script_output_section_data_list_.end(); | |
2344 | ++p) | |
2345 | delete *p; | |
2e702c99 | 2346 | this->script_output_section_data_list_.clear(); |
eb426534 RM |
2347 | |
2348 | // Special-case fill output objects are recreated each time through | |
2349 | // the relaxation loop. | |
2350 | this->reset_relax_output(); | |
2351 | } | |
2352 | ||
2353 | void | |
2354 | Layout::reset_relax_output() | |
2355 | { | |
2356 | for (Data_list::const_iterator p = this->relax_output_list_.begin(); | |
2357 | p != this->relax_output_list_.end(); | |
2358 | ++p) | |
2359 | delete *p; | |
2360 | this->relax_output_list_.clear(); | |
20e6d0d6 DK |
2361 | } |
2362 | ||
2363 | // Prepare for relaxation. | |
2364 | ||
2365 | void | |
2366 | Layout::prepare_for_relaxation() | |
2367 | { | |
2368 | // Create an relaxation debug check if in debugging mode. | |
2369 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2370 | this->relaxation_debug_check_ = new Relaxation_debug_check(); | |
2371 | ||
2372 | // Save segment states. | |
2373 | this->segment_states_ = new Segment_states(); | |
2374 | this->save_segments(this->segment_states_); | |
2375 | ||
2376 | for(Section_list::const_iterator p = this->section_list_.begin(); | |
2377 | p != this->section_list_.end(); | |
2378 | ++p) | |
2379 | (*p)->save_states(); | |
2380 | ||
2381 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2382 | this->relaxation_debug_check_->check_output_data_for_reset_values( | |
eb426534 RM |
2383 | this->section_list_, this->special_output_list_, |
2384 | this->relax_output_list_); | |
20e6d0d6 DK |
2385 | |
2386 | // Also enable recording of output section data from scripts. | |
2387 | this->record_output_section_data_from_script_ = true; | |
2388 | } | |
2389 | ||
a3ed37d8 RM |
2390 | // If the user set the address of the text segment, that may not be |
2391 | // compatible with putting the segment headers and file headers into | |
2392 | // that segment. For isolate_execinstr() targets, it's the rodata | |
2393 | // segment rather than text where we might put the headers. | |
2394 | static inline bool | |
2395 | load_seg_unusable_for_headers(const Target* target) | |
2396 | { | |
2397 | const General_options& options = parameters->options(); | |
2398 | if (target->isolate_execinstr()) | |
2399 | return (options.user_set_Trodata_segment() | |
2400 | && options.Trodata_segment() % target->abi_pagesize() != 0); | |
2401 | else | |
2402 | return (options.user_set_Ttext() | |
2403 | && options.Ttext() % target->abi_pagesize() != 0); | |
2404 | } | |
2405 | ||
20e6d0d6 DK |
2406 | // Relaxation loop body: If target has no relaxation, this runs only once |
2407 | // Otherwise, the target relaxation hook is called at the end of | |
2408 | // each iteration. If the hook returns true, it means re-layout of | |
2e702c99 | 2409 | // section is required. |
20e6d0d6 DK |
2410 | // |
2411 | // The number of segments created by a linking script without a PHDRS | |
2412 | // clause may be affected by section sizes and alignments. There is | |
2413 | // a remote chance that relaxation causes different number of PT_LOAD | |
2414 | // segments are created and sections are attached to different segments. | |
2415 | // Therefore, we always throw away all segments created during section | |
2416 | // layout. In order to be able to restart the section layout, we keep | |
2417 | // a copy of the segment list right before the relaxation loop and use | |
2418 | // that to restore the segments. | |
2e702c99 RM |
2419 | // |
2420 | // PASS is the current relaxation pass number. | |
20e6d0d6 DK |
2421 | // SYMTAB is a symbol table. |
2422 | // PLOAD_SEG is the address of a pointer for the load segment. | |
2423 | // PHDR_SEG is a pointer to the PHDR segment. | |
2424 | // SEGMENT_HEADERS points to the output segment header. | |
2425 | // FILE_HEADER points to the output file header. | |
2426 | // PSHNDX is the address to store the output section index. | |
2427 | ||
2428 | off_t inline | |
2429 | Layout::relaxation_loop_body( | |
2430 | int pass, | |
2431 | Target* target, | |
2432 | Symbol_table* symtab, | |
2433 | Output_segment** pload_seg, | |
2434 | Output_segment* phdr_seg, | |
2435 | Output_segment_headers* segment_headers, | |
2436 | Output_file_header* file_header, | |
2437 | unsigned int* pshndx) | |
2438 | { | |
2439 | // If this is not the first iteration, we need to clean up after | |
2440 | // relaxation so that we can lay out the sections again. | |
2441 | if (pass != 0) | |
2442 | this->clean_up_after_relaxation(); | |
2443 | ||
2444 | // If there is a SECTIONS clause, put all the input sections into | |
2445 | // the required order. | |
2446 | Output_segment* load_seg; | |
2447 | if (this->script_options_->saw_sections_clause()) | |
2448 | load_seg = this->set_section_addresses_from_script(symtab); | |
2449 | else if (parameters->options().relocatable()) | |
2450 | load_seg = NULL; | |
2451 | else | |
2e702c99 | 2452 | load_seg = this->find_first_load_seg(target); |
20e6d0d6 DK |
2453 | |
2454 | if (parameters->options().oformat_enum() | |
2455 | != General_options::OBJECT_FORMAT_ELF) | |
2456 | load_seg = NULL; | |
2457 | ||
a3ed37d8 | 2458 | if (load_seg_unusable_for_headers(target)) |
d12a5ea8 ILT |
2459 | { |
2460 | load_seg = NULL; | |
2461 | phdr_seg = NULL; | |
2462 | } | |
403a15dd | 2463 | |
68b6574b ILT |
2464 | gold_assert(phdr_seg == NULL |
2465 | || load_seg != NULL | |
2466 | || this->script_options_->saw_sections_clause()); | |
20e6d0d6 | 2467 | |
a192ba05 | 2468 | // If the address of the load segment we found has been set by |
1e3811b0 ILT |
2469 | // --section-start rather than by a script, then adjust the VMA and |
2470 | // LMA downward if possible to include the file and section headers. | |
2471 | uint64_t header_gap = 0; | |
a192ba05 ILT |
2472 | if (load_seg != NULL |
2473 | && load_seg->are_addresses_set() | |
1e3811b0 ILT |
2474 | && !this->script_options_->saw_sections_clause() |
2475 | && !parameters->options().relocatable()) | |
2476 | { | |
2477 | file_header->finalize_data_size(); | |
2478 | segment_headers->finalize_data_size(); | |
2479 | size_t sizeof_headers = (file_header->data_size() | |
2480 | + segment_headers->data_size()); | |
2481 | const uint64_t abi_pagesize = target->abi_pagesize(); | |
2482 | uint64_t hdr_paddr = load_seg->paddr() - sizeof_headers; | |
2483 | hdr_paddr &= ~(abi_pagesize - 1); | |
2484 | uint64_t subtract = load_seg->paddr() - hdr_paddr; | |
2485 | if (load_seg->paddr() < subtract || load_seg->vaddr() < subtract) | |
2486 | load_seg = NULL; | |
2487 | else | |
2488 | { | |
2489 | load_seg->set_addresses(load_seg->vaddr() - subtract, | |
2490 | load_seg->paddr() - subtract); | |
2491 | header_gap = subtract - sizeof_headers; | |
2492 | } | |
2493 | } | |
a192ba05 | 2494 | |
20e6d0d6 DK |
2495 | // Lay out the segment headers. |
2496 | if (!parameters->options().relocatable()) | |
2497 | { | |
2498 | gold_assert(segment_headers != NULL); | |
1e3811b0 ILT |
2499 | if (header_gap != 0 && load_seg != NULL) |
2500 | { | |
2501 | Output_data_zero_fill* z = new Output_data_zero_fill(header_gap, 1); | |
2502 | load_seg->add_initial_output_data(z); | |
2503 | } | |
20e6d0d6 | 2504 | if (load_seg != NULL) |
2e702c99 | 2505 | load_seg->add_initial_output_data(segment_headers); |
20e6d0d6 | 2506 | if (phdr_seg != NULL) |
2e702c99 | 2507 | phdr_seg->add_initial_output_data(segment_headers); |
20e6d0d6 DK |
2508 | } |
2509 | ||
2510 | // Lay out the file header. | |
2511 | if (load_seg != NULL) | |
2512 | load_seg->add_initial_output_data(file_header); | |
2513 | ||
2514 | if (this->script_options_->saw_phdrs_clause() | |
2515 | && !parameters->options().relocatable()) | |
2516 | { | |
2517 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS | |
2518 | // clause in a linker script. | |
2519 | Script_sections* ss = this->script_options_->script_sections(); | |
2520 | ss->put_headers_in_phdrs(file_header, segment_headers); | |
2521 | } | |
2522 | ||
2523 | // We set the output section indexes in set_segment_offsets and | |
2524 | // set_section_indexes. | |
2525 | *pshndx = 1; | |
2526 | ||
2527 | // Set the file offsets of all the segments, and all the sections | |
2528 | // they contain. | |
2529 | off_t off; | |
2530 | if (!parameters->options().relocatable()) | |
2531 | off = this->set_segment_offsets(target, load_seg, pshndx); | |
2532 | else | |
2533 | off = this->set_relocatable_section_offsets(file_header, pshndx); | |
2534 | ||
2535 | // Verify that the dummy relaxation does not change anything. | |
2536 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2537 | { | |
2538 | if (pass == 0) | |
2539 | this->relaxation_debug_check_->read_sections(this->section_list_); | |
2540 | else | |
2541 | this->relaxation_debug_check_->verify_sections(this->section_list_); | |
2542 | } | |
2543 | ||
2544 | *pload_seg = load_seg; | |
2545 | return off; | |
2546 | } | |
2547 | ||
6e9ba2ca ST |
2548 | // Search the list of patterns and find the postion of the given section |
2549 | // name in the output section. If the section name matches a glob | |
2550 | // pattern and a non-glob name, then the non-glob position takes | |
2551 | // precedence. Return 0 if no match is found. | |
2552 | ||
2553 | unsigned int | |
2554 | Layout::find_section_order_index(const std::string& section_name) | |
2555 | { | |
2556 | Unordered_map<std::string, unsigned int>::iterator map_it; | |
2557 | map_it = this->input_section_position_.find(section_name); | |
2558 | if (map_it != this->input_section_position_.end()) | |
2559 | return map_it->second; | |
2560 | ||
2561 | // Absolute match failed. Linear search the glob patterns. | |
2562 | std::vector<std::string>::iterator it; | |
2563 | for (it = this->input_section_glob_.begin(); | |
2564 | it != this->input_section_glob_.end(); | |
2565 | ++it) | |
2566 | { | |
2567 | if (fnmatch((*it).c_str(), section_name.c_str(), FNM_NOESCAPE) == 0) | |
2e702c99 RM |
2568 | { |
2569 | map_it = this->input_section_position_.find(*it); | |
2570 | gold_assert(map_it != this->input_section_position_.end()); | |
2571 | return map_it->second; | |
2572 | } | |
6e9ba2ca ST |
2573 | } |
2574 | return 0; | |
2575 | } | |
2576 | ||
2577 | // Read the sequence of input sections from the file specified with | |
e9552f7e | 2578 | // option --section-ordering-file. |
6e9ba2ca ST |
2579 | |
2580 | void | |
2581 | Layout::read_layout_from_file() | |
2582 | { | |
2583 | const char* filename = parameters->options().section_ordering_file(); | |
2584 | std::ifstream in; | |
2585 | std::string line; | |
2586 | ||
2587 | in.open(filename); | |
2588 | if (!in) | |
2589 | gold_fatal(_("unable to open --section-ordering-file file %s: %s"), | |
2e702c99 | 2590 | filename, strerror(errno)); |
6e9ba2ca ST |
2591 | |
2592 | std::getline(in, line); // this chops off the trailing \n, if any | |
2593 | unsigned int position = 1; | |
e9552f7e | 2594 | this->set_section_ordering_specified(); |
6e9ba2ca ST |
2595 | |
2596 | while (in) | |
2597 | { | |
2598 | if (!line.empty() && line[line.length() - 1] == '\r') // Windows | |
2e702c99 | 2599 | line.resize(line.length() - 1); |
6e9ba2ca ST |
2600 | // Ignore comments, beginning with '#' |
2601 | if (line[0] == '#') | |
2e702c99 RM |
2602 | { |
2603 | std::getline(in, line); | |
2604 | continue; | |
2605 | } | |
6e9ba2ca ST |
2606 | this->input_section_position_[line] = position; |
2607 | // Store all glob patterns in a vector. | |
2608 | if (is_wildcard_string(line.c_str())) | |
2e702c99 | 2609 | this->input_section_glob_.push_back(line); |
6e9ba2ca ST |
2610 | position++; |
2611 | std::getline(in, line); | |
2612 | } | |
2613 | } | |
2614 | ||
54dc6425 ILT |
2615 | // Finalize the layout. When this is called, we have created all the |
2616 | // output sections and all the output segments which are based on | |
2617 | // input sections. We have several things to do, and we have to do | |
2618 | // them in the right order, so that we get the right results correctly | |
2619 | // and efficiently. | |
2620 | ||
2621 | // 1) Finalize the list of output segments and create the segment | |
2622 | // table header. | |
2623 | ||
2624 | // 2) Finalize the dynamic symbol table and associated sections. | |
2625 | ||
2626 | // 3) Determine the final file offset of all the output segments. | |
2627 | ||
2628 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
2629 | // sections. | |
2630 | ||
75f65a3e ILT |
2631 | // 5) Create the symbol table sections and the section name table |
2632 | // section. | |
2633 | ||
2634 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
2635 | // value and make a final determination of which symbols are going |
2636 | // into the output symbol table. | |
2637 | ||
54dc6425 ILT |
2638 | // 7) Create the section table header. |
2639 | ||
2640 | // 8) Determine the final file offset of all the output sections which | |
2641 | // are not SHF_ALLOC, including the section table header. | |
2642 | ||
2643 | // 9) Finalize the ELF file header. | |
2644 | ||
75f65a3e ILT |
2645 | // This function returns the size of the output file. |
2646 | ||
2647 | off_t | |
17a1d0a9 | 2648 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
8851ecca | 2649 | Target* target, const Task* task) |
54dc6425 | 2650 | { |
f59f41f3 | 2651 | target->finalize_sections(this, input_objects, symtab); |
5a6f7e2d | 2652 | |
17a1d0a9 | 2653 | this->count_local_symbols(task, input_objects); |
7bf1f802 | 2654 | |
1518dc8f | 2655 | this->link_stabs_sections(); |
4f211c8b | 2656 | |
3802b2dd | 2657 | Output_segment* phdr_seg = NULL; |
8851ecca | 2658 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
54dc6425 | 2659 | { |
dbe717ef ILT |
2660 | // There was a dynamic object in the link. We need to create |
2661 | // some information for the dynamic linker. | |
2662 | ||
3802b2dd ILT |
2663 | // Create the PT_PHDR segment which will hold the program |
2664 | // headers. | |
1c4f3631 ILT |
2665 | if (!this->script_options_->saw_phdrs_clause()) |
2666 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
3802b2dd | 2667 | |
14b31740 ILT |
2668 | // Create the dynamic symbol table, including the hash table. |
2669 | Output_section* dynstr; | |
2670 | std::vector<Symbol*> dynamic_symbols; | |
2671 | unsigned int local_dynamic_count; | |
a5dc0706 | 2672 | Versions versions(*this->script_options()->version_script_info(), |
2e702c99 | 2673 | &this->dynpool_); |
9b07f471 | 2674 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
14b31740 ILT |
2675 | &local_dynamic_count, &dynamic_symbols, |
2676 | &versions); | |
dbe717ef ILT |
2677 | |
2678 | // Create the .interp section to hold the name of the | |
e1f74f98 ILT |
2679 | // interpreter, and put it in a PT_INTERP segment. Don't do it |
2680 | // if we saw a .interp section in an input file. | |
2681 | if ((!parameters->options().shared() | |
2682 | || parameters->options().dynamic_linker() != NULL) | |
2683 | && this->interp_segment_ == NULL) | |
2e702c99 | 2684 | this->create_interp(target); |
a3ad94ed ILT |
2685 | |
2686 | // Finish the .dynamic section to hold the dynamic data, and put | |
2687 | // it in a PT_DYNAMIC segment. | |
16649710 | 2688 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
2689 | |
2690 | // We should have added everything we need to the dynamic string | |
2691 | // table. | |
2692 | this->dynpool_.set_string_offsets(); | |
2693 | ||
2694 | // Create the version sections. We can't do this until the | |
2695 | // dynamic string table is complete. | |
46fe1623 | 2696 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
14b31740 | 2697 | dynamic_symbols, dynstr); |
f0ba79e2 ILT |
2698 | |
2699 | // Set the size of the _DYNAMIC symbol. We can't do this until | |
2700 | // after we call create_version_sections. | |
2701 | this->set_dynamic_symbol_size(symtab); | |
54dc6425 | 2702 | } |
2e702c99 | 2703 | |
20e6d0d6 DK |
2704 | // Create segment headers. |
2705 | Output_segment_headers* segment_headers = | |
2706 | (parameters->options().relocatable() | |
2707 | ? NULL | |
2708 | : new Output_segment_headers(this->segment_list_)); | |
75f65a3e ILT |
2709 | |
2710 | // Lay out the file header. | |
a10ae760 ILT |
2711 | Output_file_header* file_header = new Output_file_header(target, symtab, |
2712 | segment_headers); | |
a445fddf | 2713 | |
61ba1cf9 | 2714 | this->special_output_list_.push_back(file_header); |
6a74a719 ILT |
2715 | if (segment_headers != NULL) |
2716 | this->special_output_list_.push_back(segment_headers); | |
75f65a3e | 2717 | |
20e6d0d6 DK |
2718 | // Find approriate places for orphan output sections if we are using |
2719 | // a linker script. | |
2720 | if (this->script_options_->saw_sections_clause()) | |
2721 | this->place_orphan_sections_in_script(); | |
2e702c99 | 2722 | |
20e6d0d6 DK |
2723 | Output_segment* load_seg; |
2724 | off_t off; | |
2725 | unsigned int shndx; | |
2726 | int pass = 0; | |
2727 | ||
2728 | // Take a snapshot of the section layout as needed. | |
2729 | if (target->may_relax()) | |
2730 | this->prepare_for_relaxation(); | |
2e702c99 | 2731 | |
20e6d0d6 DK |
2732 | // Run the relaxation loop to lay out sections. |
2733 | do | |
1c4f3631 | 2734 | { |
20e6d0d6 DK |
2735 | off = this->relaxation_loop_body(pass, target, symtab, &load_seg, |
2736 | phdr_seg, segment_headers, file_header, | |
2737 | &shndx); | |
2738 | pass++; | |
1c4f3631 | 2739 | } |
c0a62865 | 2740 | while (target->may_relax() |
f625ae50 | 2741 | && target->relax(pass, input_objects, symtab, this, task)); |
75f65a3e | 2742 | |
eabc84f4 RM |
2743 | // If there is a load segment that contains the file and program headers, |
2744 | // provide a symbol __ehdr_start pointing there. | |
2745 | // A program can use this to examine itself robustly. | |
2746 | if (load_seg != NULL) | |
2747 | symtab->define_in_output_segment("__ehdr_start", NULL, | |
2748 | Symbol_table::PREDEFINED, load_seg, 0, 0, | |
2749 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
cde7cb01 | 2750 | elfcpp::STV_HIDDEN, 0, |
eabc84f4 RM |
2751 | Symbol::SEGMENT_START, true); |
2752 | ||
a9a60db6 ILT |
2753 | // Set the file offsets of all the non-data sections we've seen so |
2754 | // far which don't have to wait for the input sections. We need | |
2755 | // this in order to finalize local symbols in non-allocated | |
2756 | // sections. | |
2757 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); | |
2758 | ||
d491d34e ILT |
2759 | // Set the section indexes of all unallocated sections seen so far, |
2760 | // in case any of them are somehow referenced by a symbol. | |
2761 | shndx = this->set_section_indexes(shndx); | |
2762 | ||
75f65a3e | 2763 | // Create the symbol table sections. |
d491d34e | 2764 | this->create_symtab_sections(input_objects, symtab, shndx, &off); |
7bf1f802 ILT |
2765 | if (!parameters->doing_static_link()) |
2766 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e | 2767 | |
e5756efb ILT |
2768 | // Process any symbol assignments from a linker script. This must |
2769 | // be called after the symbol table has been finalized. | |
2770 | this->script_options_->finalize_symbols(symtab, this); | |
2771 | ||
09ec0418 CC |
2772 | // Create the incremental inputs sections. |
2773 | if (this->incremental_inputs_) | |
2774 | { | |
2775 | this->incremental_inputs_->finalize(); | |
2776 | this->create_incremental_info_sections(symtab); | |
2777 | } | |
2778 | ||
75f65a3e ILT |
2779 | // Create the .shstrtab section. |
2780 | Output_section* shstrtab_section = this->create_shstrtab(); | |
2781 | ||
a9a60db6 ILT |
2782 | // Set the file offsets of the rest of the non-data sections which |
2783 | // don't have to wait for the input sections. | |
9a0910c3 | 2784 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 | 2785 | |
d491d34e ILT |
2786 | // Now that all sections have been created, set the section indexes |
2787 | // for any sections which haven't been done yet. | |
86887060 | 2788 | shndx = this->set_section_indexes(shndx); |
ead1e424 | 2789 | |
75f65a3e | 2790 | // Create the section table header. |
d491d34e | 2791 | this->create_shdrs(shstrtab_section, &off); |
75f65a3e | 2792 | |
17a1d0a9 ILT |
2793 | // If there are no sections which require postprocessing, we can |
2794 | // handle the section names now, and avoid a resize later. | |
2795 | if (!this->any_postprocessing_sections_) | |
09ec0418 CC |
2796 | { |
2797 | off = this->set_section_offsets(off, | |
2798 | POSTPROCESSING_SECTIONS_PASS); | |
2799 | off = | |
2800 | this->set_section_offsets(off, | |
17a1d0a9 | 2801 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); |
09ec0418 | 2802 | } |
17a1d0a9 | 2803 | |
27bc2bce | 2804 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 2805 | |
27bc2bce ILT |
2806 | // Now we know exactly where everything goes in the output file |
2807 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 2808 | Output_data::layout_complete(); |
75f65a3e | 2809 | |
e44fcf3b ILT |
2810 | this->output_file_size_ = off; |
2811 | ||
75f65a3e ILT |
2812 | return off; |
2813 | } | |
2814 | ||
8ed814a9 | 2815 | // Create a note header following the format defined in the ELF ABI. |
ec3f783e ILT |
2816 | // NAME is the name, NOTE_TYPE is the type, SECTION_NAME is the name |
2817 | // of the section to create, DESCSZ is the size of the descriptor. | |
2818 | // ALLOCATE is true if the section should be allocated in memory. | |
2819 | // This returns the new note section. It sets *TRAILING_PADDING to | |
2820 | // the number of trailing zero bytes required. | |
4f211c8b | 2821 | |
8ed814a9 | 2822 | Output_section* |
ef4ab7a8 PP |
2823 | Layout::create_note(const char* name, int note_type, |
2824 | const char* section_name, size_t descsz, | |
8ed814a9 | 2825 | bool allocate, size_t* trailing_padding) |
4f211c8b | 2826 | { |
e2305dc0 ILT |
2827 | // Authorities all agree that the values in a .note field should |
2828 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
2829 | // they differ on what the alignment is for 64-bit binaries. | |
2830 | // The GABI says unambiguously they take 8-byte alignment: | |
2831 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
2832 | // Other documentation says alignment should always be 4 bytes: | |
2833 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
2834 | // GNU ld and GNU readelf both support the latter (at least as of | |
2835 | // version 2.16.91), and glibc always generates the latter for | |
2836 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
2837 | // here. | |
35cdfc9a | 2838 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
8851ecca | 2839 | const int size = parameters->target().get_size(); |
e2305dc0 ILT |
2840 | #else |
2841 | const int size = 32; | |
2842 | #endif | |
4f211c8b ILT |
2843 | |
2844 | // The contents of the .note section. | |
4f211c8b ILT |
2845 | size_t namesz = strlen(name) + 1; |
2846 | size_t aligned_namesz = align_address(namesz, size / 8); | |
4f211c8b | 2847 | size_t aligned_descsz = align_address(descsz, size / 8); |
4f211c8b | 2848 | |
8ed814a9 | 2849 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
4f211c8b | 2850 | |
8ed814a9 ILT |
2851 | unsigned char* buffer = new unsigned char[notehdrsz]; |
2852 | memset(buffer, 0, notehdrsz); | |
4f211c8b | 2853 | |
8851ecca | 2854 | bool is_big_endian = parameters->target().is_big_endian(); |
4f211c8b ILT |
2855 | |
2856 | if (size == 32) | |
2857 | { | |
2858 | if (!is_big_endian) | |
2859 | { | |
2860 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
2861 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
2862 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
2863 | } | |
2864 | else | |
2865 | { | |
2866 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
2867 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
2868 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
2869 | } | |
2870 | } | |
2871 | else if (size == 64) | |
2872 | { | |
2873 | if (!is_big_endian) | |
2874 | { | |
2875 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
2876 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
2877 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
2878 | } | |
2879 | else | |
2880 | { | |
2881 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
2882 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
2883 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
2884 | } | |
2885 | } | |
2886 | else | |
2887 | gold_unreachable(); | |
2888 | ||
2889 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
4f211c8b | 2890 | |
8ed814a9 | 2891 | elfcpp::Elf_Xword flags = 0; |
22f0da72 | 2892 | Output_section_order order = ORDER_INVALID; |
8ed814a9 | 2893 | if (allocate) |
22f0da72 ILT |
2894 | { |
2895 | flags = elfcpp::SHF_ALLOC; | |
2896 | order = ORDER_RO_NOTE; | |
2897 | } | |
ec3f783e ILT |
2898 | Output_section* os = this->choose_output_section(NULL, section_name, |
2899 | elfcpp::SHT_NOTE, | |
22f0da72 | 2900 | flags, false, order, false); |
9c547ec3 ILT |
2901 | if (os == NULL) |
2902 | return NULL; | |
2903 | ||
8ed814a9 | 2904 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, |
7d9e3d98 ILT |
2905 | size / 8, |
2906 | "** note header"); | |
8ed814a9 ILT |
2907 | os->add_output_section_data(posd); |
2908 | ||
2909 | *trailing_padding = aligned_descsz - descsz; | |
2910 | ||
2911 | return os; | |
2912 | } | |
2913 | ||
2914 | // For an executable or shared library, create a note to record the | |
2915 | // version of gold used to create the binary. | |
2916 | ||
2917 | void | |
2918 | Layout::create_gold_note() | |
2919 | { | |
cdc29364 CC |
2920 | if (parameters->options().relocatable() |
2921 | || parameters->incremental_update()) | |
8ed814a9 ILT |
2922 | return; |
2923 | ||
2924 | std::string desc = std::string("gold ") + gold::get_version_string(); | |
2925 | ||
2926 | size_t trailing_padding; | |
ca09d69a | 2927 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, |
ef4ab7a8 PP |
2928 | ".note.gnu.gold-version", desc.size(), |
2929 | false, &trailing_padding); | |
9c547ec3 ILT |
2930 | if (os == NULL) |
2931 | return; | |
8ed814a9 ILT |
2932 | |
2933 | Output_section_data* posd = new Output_data_const(desc, 4); | |
4f211c8b | 2934 | os->add_output_section_data(posd); |
8ed814a9 ILT |
2935 | |
2936 | if (trailing_padding > 0) | |
2937 | { | |
7d9e3d98 | 2938 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
2939 | os->add_output_section_data(posd); |
2940 | } | |
4f211c8b ILT |
2941 | } |
2942 | ||
35cdfc9a ILT |
2943 | // Record whether the stack should be executable. This can be set |
2944 | // from the command line using the -z execstack or -z noexecstack | |
2945 | // options. Otherwise, if any input file has a .note.GNU-stack | |
2946 | // section with the SHF_EXECINSTR flag set, the stack should be | |
2947 | // executable. Otherwise, if at least one input file a | |
2948 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
2949 | // section, we use the target default for whether the stack should be | |
2950 | // executable. Otherwise, we don't generate a stack note. When | |
2951 | // generating a object file, we create a .note.GNU-stack section with | |
2952 | // the appropriate marking. When generating an executable or shared | |
2953 | // library, we create a PT_GNU_STACK segment. | |
2954 | ||
2955 | void | |
9c547ec3 | 2956 | Layout::create_executable_stack_info() |
35cdfc9a ILT |
2957 | { |
2958 | bool is_stack_executable; | |
e55bde5e ILT |
2959 | if (parameters->options().is_execstack_set()) |
2960 | is_stack_executable = parameters->options().is_stack_executable(); | |
35cdfc9a ILT |
2961 | else if (!this->input_with_gnu_stack_note_) |
2962 | return; | |
2963 | else | |
2964 | { | |
2965 | if (this->input_requires_executable_stack_) | |
2966 | is_stack_executable = true; | |
2967 | else if (this->input_without_gnu_stack_note_) | |
9c547ec3 ILT |
2968 | is_stack_executable = |
2969 | parameters->target().is_default_stack_executable(); | |
35cdfc9a ILT |
2970 | else |
2971 | is_stack_executable = false; | |
2972 | } | |
2973 | ||
8851ecca | 2974 | if (parameters->options().relocatable()) |
35cdfc9a ILT |
2975 | { |
2976 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
2977 | elfcpp::Elf_Xword flags = 0; | |
2978 | if (is_stack_executable) | |
2979 | flags |= elfcpp::SHF_EXECINSTR; | |
22f0da72 ILT |
2980 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags, |
2981 | ORDER_INVALID, false); | |
35cdfc9a ILT |
2982 | } |
2983 | else | |
2984 | { | |
1c4f3631 ILT |
2985 | if (this->script_options_->saw_phdrs_clause()) |
2986 | return; | |
35cdfc9a ILT |
2987 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
2988 | if (is_stack_executable) | |
2989 | flags |= elfcpp::PF_X; | |
3802b2dd | 2990 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); |
35cdfc9a ILT |
2991 | } |
2992 | } | |
2993 | ||
8ed814a9 ILT |
2994 | // If --build-id was used, set up the build ID note. |
2995 | ||
2996 | void | |
2997 | Layout::create_build_id() | |
2998 | { | |
2999 | if (!parameters->options().user_set_build_id()) | |
3000 | return; | |
3001 | ||
3002 | const char* style = parameters->options().build_id(); | |
3003 | if (strcmp(style, "none") == 0) | |
3004 | return; | |
3005 | ||
3006 | // Set DESCSZ to the size of the note descriptor. When possible, | |
3007 | // set DESC to the note descriptor contents. | |
3008 | size_t descsz; | |
3009 | std::string desc; | |
3010 | if (strcmp(style, "md5") == 0) | |
3011 | descsz = 128 / 8; | |
e7c5ea40 | 3012 | else if ((strcmp(style, "sha1") == 0) || (strcmp(style, "tree") == 0)) |
8ed814a9 ILT |
3013 | descsz = 160 / 8; |
3014 | else if (strcmp(style, "uuid") == 0) | |
3015 | { | |
3016 | const size_t uuidsz = 128 / 8; | |
3017 | ||
3018 | char buffer[uuidsz]; | |
3019 | memset(buffer, 0, uuidsz); | |
3020 | ||
2a00e4fb | 3021 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
8ed814a9 ILT |
3022 | if (descriptor < 0) |
3023 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), | |
3024 | strerror(errno)); | |
3025 | else | |
3026 | { | |
3027 | ssize_t got = ::read(descriptor, buffer, uuidsz); | |
2a00e4fb | 3028 | release_descriptor(descriptor, true); |
8ed814a9 ILT |
3029 | if (got < 0) |
3030 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); | |
3031 | else if (static_cast<size_t>(got) != uuidsz) | |
3032 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), | |
3033 | uuidsz, got); | |
3034 | } | |
3035 | ||
3036 | desc.assign(buffer, uuidsz); | |
3037 | descsz = uuidsz; | |
3038 | } | |
3039 | else if (strncmp(style, "0x", 2) == 0) | |
3040 | { | |
3041 | hex_init(); | |
3042 | const char* p = style + 2; | |
3043 | while (*p != '\0') | |
3044 | { | |
3045 | if (hex_p(p[0]) && hex_p(p[1])) | |
3046 | { | |
3047 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); | |
3048 | desc += c; | |
3049 | p += 2; | |
3050 | } | |
3051 | else if (*p == '-' || *p == ':') | |
3052 | ++p; | |
3053 | else | |
3054 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), | |
3055 | style); | |
3056 | } | |
3057 | descsz = desc.size(); | |
3058 | } | |
3059 | else | |
3060 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); | |
3061 | ||
3062 | // Create the note. | |
3063 | size_t trailing_padding; | |
3064 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, | |
ef4ab7a8 PP |
3065 | ".note.gnu.build-id", descsz, true, |
3066 | &trailing_padding); | |
9c547ec3 ILT |
3067 | if (os == NULL) |
3068 | return; | |
8ed814a9 ILT |
3069 | |
3070 | if (!desc.empty()) | |
3071 | { | |
3072 | // We know the value already, so we fill it in now. | |
3073 | gold_assert(desc.size() == descsz); | |
3074 | ||
3075 | Output_section_data* posd = new Output_data_const(desc, 4); | |
3076 | os->add_output_section_data(posd); | |
3077 | ||
3078 | if (trailing_padding != 0) | |
3079 | { | |
7d9e3d98 | 3080 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
3081 | os->add_output_section_data(posd); |
3082 | } | |
3083 | } | |
3084 | else | |
3085 | { | |
3086 | // We need to compute a checksum after we have completed the | |
3087 | // link. | |
3088 | gold_assert(trailing_padding == 0); | |
7d9e3d98 | 3089 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
8ed814a9 | 3090 | os->add_output_section_data(this->build_id_note_); |
8ed814a9 ILT |
3091 | } |
3092 | } | |
3093 | ||
1518dc8f ILT |
3094 | // If we have both .stabXX and .stabXXstr sections, then the sh_link |
3095 | // field of the former should point to the latter. I'm not sure who | |
3096 | // started this, but the GNU linker does it, and some tools depend | |
3097 | // upon it. | |
3098 | ||
3099 | void | |
3100 | Layout::link_stabs_sections() | |
3101 | { | |
3102 | if (!this->have_stabstr_section_) | |
3103 | return; | |
3104 | ||
3105 | for (Section_list::iterator p = this->section_list_.begin(); | |
3106 | p != this->section_list_.end(); | |
3107 | ++p) | |
3108 | { | |
3109 | if ((*p)->type() != elfcpp::SHT_STRTAB) | |
3110 | continue; | |
3111 | ||
3112 | const char* name = (*p)->name(); | |
3113 | if (strncmp(name, ".stab", 5) != 0) | |
3114 | continue; | |
3115 | ||
3116 | size_t len = strlen(name); | |
3117 | if (strcmp(name + len - 3, "str") != 0) | |
3118 | continue; | |
3119 | ||
3120 | std::string stab_name(name, len - 3); | |
3121 | Output_section* stab_sec; | |
3122 | stab_sec = this->find_output_section(stab_name.c_str()); | |
3123 | if (stab_sec != NULL) | |
3124 | stab_sec->set_link_section(*p); | |
3125 | } | |
3126 | } | |
3127 | ||
09ec0418 | 3128 | // Create .gnu_incremental_inputs and related sections needed |
3ce2c28e ILT |
3129 | // for the next run of incremental linking to check what has changed. |
3130 | ||
3131 | void | |
09ec0418 | 3132 | Layout::create_incremental_info_sections(Symbol_table* symtab) |
3ce2c28e | 3133 | { |
09ec0418 CC |
3134 | Incremental_inputs* incr = this->incremental_inputs_; |
3135 | ||
3136 | gold_assert(incr != NULL); | |
3137 | ||
3138 | // Create the .gnu_incremental_inputs, _symtab, and _relocs input sections. | |
3139 | incr->create_data_sections(symtab); | |
3ce2c28e ILT |
3140 | |
3141 | // Add the .gnu_incremental_inputs section. | |
ca09d69a | 3142 | const char* incremental_inputs_name = |
3ce2c28e | 3143 | this->namepool_.add(".gnu_incremental_inputs", false, NULL); |
09ec0418 | 3144 | Output_section* incremental_inputs_os = |
3ce2c28e | 3145 | this->make_output_section(incremental_inputs_name, |
f5c870d2 | 3146 | elfcpp::SHT_GNU_INCREMENTAL_INPUTS, 0, |
22f0da72 | 3147 | ORDER_INVALID, false); |
09ec0418 CC |
3148 | incremental_inputs_os->add_output_section_data(incr->inputs_section()); |
3149 | ||
3150 | // Add the .gnu_incremental_symtab section. | |
ca09d69a | 3151 | const char* incremental_symtab_name = |
09ec0418 CC |
3152 | this->namepool_.add(".gnu_incremental_symtab", false, NULL); |
3153 | Output_section* incremental_symtab_os = | |
3154 | this->make_output_section(incremental_symtab_name, | |
3155 | elfcpp::SHT_GNU_INCREMENTAL_SYMTAB, 0, | |
3156 | ORDER_INVALID, false); | |
3157 | incremental_symtab_os->add_output_section_data(incr->symtab_section()); | |
3158 | incremental_symtab_os->set_entsize(4); | |
3159 | ||
3160 | // Add the .gnu_incremental_relocs section. | |
ca09d69a | 3161 | const char* incremental_relocs_name = |
09ec0418 CC |
3162 | this->namepool_.add(".gnu_incremental_relocs", false, NULL); |
3163 | Output_section* incremental_relocs_os = | |
3164 | this->make_output_section(incremental_relocs_name, | |
3165 | elfcpp::SHT_GNU_INCREMENTAL_RELOCS, 0, | |
3166 | ORDER_INVALID, false); | |
3167 | incremental_relocs_os->add_output_section_data(incr->relocs_section()); | |
3168 | incremental_relocs_os->set_entsize(incr->relocs_entsize()); | |
3169 | ||
0e70b911 | 3170 | // Add the .gnu_incremental_got_plt section. |
ca09d69a | 3171 | const char* incremental_got_plt_name = |
0e70b911 CC |
3172 | this->namepool_.add(".gnu_incremental_got_plt", false, NULL); |
3173 | Output_section* incremental_got_plt_os = | |
3174 | this->make_output_section(incremental_got_plt_name, | |
3175 | elfcpp::SHT_GNU_INCREMENTAL_GOT_PLT, 0, | |
3176 | ORDER_INVALID, false); | |
3177 | incremental_got_plt_os->add_output_section_data(incr->got_plt_section()); | |
3178 | ||
3ce2c28e | 3179 | // Add the .gnu_incremental_strtab section. |
ca09d69a | 3180 | const char* incremental_strtab_name = |
3ce2c28e | 3181 | this->namepool_.add(".gnu_incremental_strtab", false, NULL); |
09ec0418 | 3182 | Output_section* incremental_strtab_os = this->make_output_section(incremental_strtab_name, |
2e702c99 RM |
3183 | elfcpp::SHT_STRTAB, 0, |
3184 | ORDER_INVALID, false); | |
3ce2c28e | 3185 | Output_data_strtab* strtab_data = |
09ec0418 CC |
3186 | new Output_data_strtab(incr->get_stringpool()); |
3187 | incremental_strtab_os->add_output_section_data(strtab_data); | |
3188 | ||
3189 | incremental_inputs_os->set_after_input_sections(); | |
3190 | incremental_symtab_os->set_after_input_sections(); | |
3191 | incremental_relocs_os->set_after_input_sections(); | |
0e70b911 | 3192 | incremental_got_plt_os->set_after_input_sections(); |
09ec0418 CC |
3193 | |
3194 | incremental_inputs_os->set_link_section(incremental_strtab_os); | |
3195 | incremental_symtab_os->set_link_section(incremental_inputs_os); | |
3196 | incremental_relocs_os->set_link_section(incremental_inputs_os); | |
0e70b911 | 3197 | incremental_got_plt_os->set_link_section(incremental_inputs_os); |
3ce2c28e ILT |
3198 | } |
3199 | ||
75f65a3e ILT |
3200 | // Return whether SEG1 should be before SEG2 in the output file. This |
3201 | // is based entirely on the segment type and flags. When this is | |
aecf301f | 3202 | // called the segment addresses have normally not yet been set. |
75f65a3e ILT |
3203 | |
3204 | bool | |
3205 | Layout::segment_precedes(const Output_segment* seg1, | |
3206 | const Output_segment* seg2) | |
3207 | { | |
3208 | elfcpp::Elf_Word type1 = seg1->type(); | |
3209 | elfcpp::Elf_Word type2 = seg2->type(); | |
3210 | ||
3211 | // The single PT_PHDR segment is required to precede any loadable | |
3212 | // segment. We simply make it always first. | |
3213 | if (type1 == elfcpp::PT_PHDR) | |
3214 | { | |
a3ad94ed | 3215 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
3216 | return true; |
3217 | } | |
3218 | if (type2 == elfcpp::PT_PHDR) | |
3219 | return false; | |
3220 | ||
3221 | // The single PT_INTERP segment is required to precede any loadable | |
3222 | // segment. We simply make it always second. | |
3223 | if (type1 == elfcpp::PT_INTERP) | |
3224 | { | |
a3ad94ed | 3225 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
3226 | return true; |
3227 | } | |
3228 | if (type2 == elfcpp::PT_INTERP) | |
3229 | return false; | |
3230 | ||
3231 | // We then put PT_LOAD segments before any other segments. | |
3232 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
3233 | return true; | |
3234 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
3235 | return false; | |
3236 | ||
9f1d377b ILT |
3237 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
3238 | // segment, because that is where the dynamic linker expects to find | |
3239 | // it (this is just for efficiency; other positions would also work | |
3240 | // correctly). | |
3241 | if (type1 == elfcpp::PT_TLS | |
3242 | && type2 != elfcpp::PT_TLS | |
3243 | && type2 != elfcpp::PT_GNU_RELRO) | |
3244 | return false; | |
3245 | if (type2 == elfcpp::PT_TLS | |
3246 | && type1 != elfcpp::PT_TLS | |
3247 | && type1 != elfcpp::PT_GNU_RELRO) | |
3248 | return true; | |
3249 | ||
3250 | // We put the PT_GNU_RELRO segment last, because that is where the | |
3251 | // dynamic linker expects to find it (as with PT_TLS, this is just | |
3252 | // for efficiency). | |
3253 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) | |
92e059d8 | 3254 | return false; |
9f1d377b | 3255 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
92e059d8 ILT |
3256 | return true; |
3257 | ||
75f65a3e ILT |
3258 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
3259 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
3260 | ||
3261 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
3262 | // by the numeric segment type and flags values. There should not | |
a4034750 AM |
3263 | // be more than one segment with the same type and flags, except |
3264 | // when a linker script specifies such. | |
75f65a3e ILT |
3265 | if (type1 != elfcpp::PT_LOAD) |
3266 | { | |
3267 | if (type1 != type2) | |
3268 | return type1 < type2; | |
a4034750 AM |
3269 | gold_assert(flags1 != flags2 |
3270 | || this->script_options_->saw_phdrs_clause()); | |
75f65a3e ILT |
3271 | return flags1 < flags2; |
3272 | } | |
3273 | ||
a445fddf ILT |
3274 | // If the addresses are set already, sort by load address. |
3275 | if (seg1->are_addresses_set()) | |
3276 | { | |
3277 | if (!seg2->are_addresses_set()) | |
3278 | return true; | |
3279 | ||
3280 | unsigned int section_count1 = seg1->output_section_count(); | |
3281 | unsigned int section_count2 = seg2->output_section_count(); | |
3282 | if (section_count1 == 0 && section_count2 > 0) | |
3283 | return true; | |
3284 | if (section_count1 > 0 && section_count2 == 0) | |
3285 | return false; | |
3286 | ||
b8fa8750 NC |
3287 | uint64_t paddr1 = (seg1->are_addresses_set() |
3288 | ? seg1->paddr() | |
3289 | : seg1->first_section_load_address()); | |
3290 | uint64_t paddr2 = (seg2->are_addresses_set() | |
3291 | ? seg2->paddr() | |
3292 | : seg2->first_section_load_address()); | |
3293 | ||
a445fddf ILT |
3294 | if (paddr1 != paddr2) |
3295 | return paddr1 < paddr2; | |
3296 | } | |
3297 | else if (seg2->are_addresses_set()) | |
3298 | return false; | |
3299 | ||
8a5e3e08 ILT |
3300 | // A segment which holds large data comes after a segment which does |
3301 | // not hold large data. | |
3302 | if (seg1->is_large_data_segment()) | |
3303 | { | |
3304 | if (!seg2->is_large_data_segment()) | |
3305 | return false; | |
3306 | } | |
3307 | else if (seg2->is_large_data_segment()) | |
3308 | return true; | |
3309 | ||
3310 | // Otherwise, we sort PT_LOAD segments based on the flags. Readonly | |
3311 | // segments come before writable segments. Then writable segments | |
3312 | // with data come before writable segments without data. Then | |
3313 | // executable segments come before non-executable segments. Then | |
3314 | // the unlikely case of a non-readable segment comes before the | |
3315 | // normal case of a readable segment. If there are multiple | |
3316 | // segments with the same type and flags, we require that the | |
3317 | // address be set, and we sort by virtual address and then physical | |
3318 | // address. | |
75f65a3e ILT |
3319 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
3320 | return (flags1 & elfcpp::PF_W) == 0; | |
756ac4a8 ILT |
3321 | if ((flags1 & elfcpp::PF_W) != 0 |
3322 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) | |
3323 | return seg1->has_any_data_sections(); | |
75f65a3e ILT |
3324 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
3325 | return (flags1 & elfcpp::PF_X) != 0; | |
3326 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
3327 | return (flags1 & elfcpp::PF_R) == 0; | |
3328 | ||
a445fddf | 3329 | // We shouldn't get here--we shouldn't create segments which we |
aecf301f | 3330 | // can't distinguish. Unless of course we are using a weird linker |
16164a6b ST |
3331 | // script or overlapping --section-start options. We could also get |
3332 | // here if plugins want unique segments for subsets of sections. | |
ea0d8c47 | 3333 | gold_assert(this->script_options_->saw_phdrs_clause() |
16164a6b ST |
3334 | || parameters->options().any_section_start() |
3335 | || this->is_unique_segment_for_sections_specified()); | |
aecf301f | 3336 | return false; |
75f65a3e ILT |
3337 | } |
3338 | ||
8a5e3e08 ILT |
3339 | // Increase OFF so that it is congruent to ADDR modulo ABI_PAGESIZE. |
3340 | ||
3341 | static off_t | |
3342 | align_file_offset(off_t off, uint64_t addr, uint64_t abi_pagesize) | |
3343 | { | |
3344 | uint64_t unsigned_off = off; | |
3345 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) | |
3346 | | (addr & (abi_pagesize - 1))); | |
3347 | if (aligned_off < unsigned_off) | |
3348 | aligned_off += abi_pagesize; | |
3349 | return aligned_off; | |
3350 | } | |
3351 | ||
a3ed37d8 RM |
3352 | // On targets where the text segment contains only executable code, |
3353 | // a non-executable segment is never the text segment. | |
3354 | ||
3355 | static inline bool | |
3356 | is_text_segment(const Target* target, const Output_segment* seg) | |
3357 | { | |
3358 | elfcpp::Elf_Xword flags = seg->flags(); | |
3359 | if ((flags & elfcpp::PF_W) != 0) | |
3360 | return false; | |
3361 | if ((flags & elfcpp::PF_X) == 0) | |
3362 | return !target->isolate_execinstr(); | |
3363 | return true; | |
3364 | } | |
3365 | ||
ead1e424 ILT |
3366 | // Set the file offsets of all the segments, and all the sections they |
3367 | // contain. They have all been created. LOAD_SEG must be be laid out | |
3368 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
3369 | |
3370 | off_t | |
ead1e424 | 3371 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
ca09d69a | 3372 | unsigned int* pshndx) |
75f65a3e | 3373 | { |
aecf301f ILT |
3374 | // Sort them into the final order. We use a stable sort so that we |
3375 | // don't randomize the order of indistinguishable segments created | |
3376 | // by linker scripts. | |
3377 | std::stable_sort(this->segment_list_.begin(), this->segment_list_.end(), | |
3378 | Layout::Compare_segments(this)); | |
54dc6425 | 3379 | |
75f65a3e ILT |
3380 | // Find the PT_LOAD segments, and set their addresses and offsets |
3381 | // and their section's addresses and offsets. | |
2e702c99 | 3382 | uint64_t start_addr; |
e55bde5e | 3383 | if (parameters->options().user_set_Ttext()) |
2e702c99 | 3384 | start_addr = parameters->options().Ttext(); |
374ad285 | 3385 | else if (parameters->options().output_is_position_independent()) |
2e702c99 | 3386 | start_addr = 0; |
0c5e9c22 | 3387 | else |
2e702c99 RM |
3388 | start_addr = target->default_text_segment_address(); |
3389 | ||
3390 | uint64_t addr = start_addr; | |
75f65a3e | 3391 | off_t off = 0; |
a445fddf ILT |
3392 | |
3393 | // If LOAD_SEG is NULL, then the file header and segment headers | |
3394 | // will not be loadable. But they still need to be at offset 0 in | |
3395 | // the file. Set their offsets now. | |
3396 | if (load_seg == NULL) | |
3397 | { | |
3398 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
3399 | p != this->special_output_list_.end(); | |
3400 | ++p) | |
3401 | { | |
3402 | off = align_address(off, (*p)->addralign()); | |
3403 | (*p)->set_address_and_file_offset(0, off); | |
3404 | off += (*p)->data_size(); | |
3405 | } | |
3406 | } | |
3407 | ||
1a2dff53 ILT |
3408 | unsigned int increase_relro = this->increase_relro_; |
3409 | if (this->script_options_->saw_sections_clause()) | |
3410 | increase_relro = 0; | |
3411 | ||
34810851 ILT |
3412 | const bool check_sections = parameters->options().check_sections(); |
3413 | Output_segment* last_load_segment = NULL; | |
3414 | ||
2e702c99 RM |
3415 | unsigned int shndx_begin = *pshndx; |
3416 | unsigned int shndx_load_seg = *pshndx; | |
3417 | ||
75f65a3e ILT |
3418 | for (Segment_list::iterator p = this->segment_list_.begin(); |
3419 | p != this->segment_list_.end(); | |
3420 | ++p) | |
3421 | { | |
3422 | if ((*p)->type() == elfcpp::PT_LOAD) | |
3423 | { | |
2e702c99 RM |
3424 | if (target->isolate_execinstr()) |
3425 | { | |
3426 | // When we hit the segment that should contain the | |
3427 | // file headers, reset the file offset so we place | |
3428 | // it and subsequent segments appropriately. | |
3429 | // We'll fix up the preceding segments below. | |
3430 | if (load_seg == *p) | |
3431 | { | |
3432 | if (off == 0) | |
3433 | load_seg = NULL; | |
3434 | else | |
3435 | { | |
3436 | off = 0; | |
3437 | shndx_load_seg = *pshndx; | |
3438 | } | |
3439 | } | |
3440 | } | |
3441 | else | |
3442 | { | |
3443 | // Verify that the file headers fall into the first segment. | |
3444 | if (load_seg != NULL && load_seg != *p) | |
3445 | gold_unreachable(); | |
3446 | load_seg = NULL; | |
3447 | } | |
75f65a3e | 3448 | |
756ac4a8 ILT |
3449 | bool are_addresses_set = (*p)->are_addresses_set(); |
3450 | if (are_addresses_set) | |
3451 | { | |
3452 | // When it comes to setting file offsets, we care about | |
3453 | // the physical address. | |
3454 | addr = (*p)->paddr(); | |
3455 | } | |
9590bf25 | 3456 | else if (parameters->options().user_set_Ttext() |
ebacd51e | 3457 | && (parameters->options().omagic() |
a3ed37d8 RM |
3458 | || is_text_segment(target, *p))) |
3459 | { | |
3460 | are_addresses_set = true; | |
3461 | } | |
3462 | else if (parameters->options().user_set_Trodata_segment() | |
3463 | && ((*p)->flags() & (elfcpp::PF_W | elfcpp::PF_X)) == 0) | |
9590bf25 | 3464 | { |
a3ed37d8 | 3465 | addr = parameters->options().Trodata_segment(); |
9590bf25 CC |
3466 | are_addresses_set = true; |
3467 | } | |
e55bde5e | 3468 | else if (parameters->options().user_set_Tdata() |
756ac4a8 | 3469 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
e55bde5e | 3470 | && (!parameters->options().user_set_Tbss() |
756ac4a8 ILT |
3471 | || (*p)->has_any_data_sections())) |
3472 | { | |
e55bde5e | 3473 | addr = parameters->options().Tdata(); |
756ac4a8 ILT |
3474 | are_addresses_set = true; |
3475 | } | |
e55bde5e | 3476 | else if (parameters->options().user_set_Tbss() |
756ac4a8 ILT |
3477 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
3478 | && !(*p)->has_any_data_sections()) | |
3479 | { | |
e55bde5e | 3480 | addr = parameters->options().Tbss(); |
756ac4a8 ILT |
3481 | are_addresses_set = true; |
3482 | } | |
3483 | ||
75f65a3e ILT |
3484 | uint64_t orig_addr = addr; |
3485 | uint64_t orig_off = off; | |
3486 | ||
a445fddf | 3487 | uint64_t aligned_addr = 0; |
75f65a3e | 3488 | uint64_t abi_pagesize = target->abi_pagesize(); |
af6156ef | 3489 | uint64_t common_pagesize = target->common_pagesize(); |
0496d5e5 | 3490 | |
af6156ef ILT |
3491 | if (!parameters->options().nmagic() |
3492 | && !parameters->options().omagic()) | |
a1373b60 | 3493 | (*p)->set_minimum_p_align(abi_pagesize); |
0496d5e5 | 3494 | |
8a5e3e08 | 3495 | if (!are_addresses_set) |
a445fddf | 3496 | { |
a6577478 RÁE |
3497 | // Skip the address forward one page, maintaining the same |
3498 | // position within the page. This lets us store both segments | |
3499 | // overlapping on a single page in the file, but the loader will | |
3500 | // put them on different pages in memory. We will revisit this | |
3501 | // decision once we know the size of the segment. | |
a445fddf ILT |
3502 | |
3503 | addr = align_address(addr, (*p)->maximum_alignment()); | |
75f65a3e | 3504 | aligned_addr = addr; |
a445fddf | 3505 | |
2e702c99 RM |
3506 | if (load_seg == *p) |
3507 | { | |
3508 | // This is the segment that will contain the file | |
3509 | // headers, so its offset will have to be exactly zero. | |
3510 | gold_assert(orig_off == 0); | |
3511 | ||
3512 | // If the target wants a fixed minimum distance from the | |
3513 | // text segment to the read-only segment, move up now. | |
bbc5ae17 RM |
3514 | uint64_t min_addr = |
3515 | start_addr + (parameters->options().user_set_rosegment_gap() | |
3516 | ? parameters->options().rosegment_gap() | |
3517 | : target->rosegment_gap()); | |
2e702c99 RM |
3518 | if (addr < min_addr) |
3519 | addr = min_addr; | |
3520 | ||
3521 | // But this is not the first segment! To make its | |
3522 | // address congruent with its offset, that address better | |
3523 | // be aligned to the ABI-mandated page size. | |
3524 | addr = align_address(addr, abi_pagesize); | |
3525 | aligned_addr = addr; | |
3526 | } | |
3527 | else | |
3528 | { | |
3529 | if ((addr & (abi_pagesize - 1)) != 0) | |
3530 | addr = addr + abi_pagesize; | |
a445fddf | 3531 | |
2e702c99 RM |
3532 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
3533 | } | |
75f65a3e ILT |
3534 | } |
3535 | ||
8a5e3e08 ILT |
3536 | if (!parameters->options().nmagic() |
3537 | && !parameters->options().omagic()) | |
7fb47cc9 CC |
3538 | { |
3539 | // Here we are also taking care of the case when | |
3540 | // the maximum segment alignment is larger than the page size. | |
3541 | off = align_file_offset(off, addr, | |
3542 | std::max(abi_pagesize, | |
3543 | (*p)->maximum_alignment())); | |
3544 | } | |
2e702c99 | 3545 | else |
661be1e2 ILT |
3546 | { |
3547 | // This is -N or -n with a section script which prevents | |
3548 | // us from using a load segment. We need to ensure that | |
3549 | // the file offset is aligned to the alignment of the | |
3550 | // segment. This is because the linker script | |
3551 | // implicitly assumed a zero offset. If we don't align | |
3552 | // here, then the alignment of the sections in the | |
3553 | // linker script may not match the alignment of the | |
3554 | // sections in the set_section_addresses call below, | |
3555 | // causing an error about dot moving backward. | |
3556 | off = align_address(off, (*p)->maximum_alignment()); | |
3557 | } | |
8a5e3e08 | 3558 | |
ead1e424 | 3559 | unsigned int shndx_hold = *pshndx; |
fc497986 | 3560 | bool has_relro = false; |
eb426534 RM |
3561 | uint64_t new_addr = (*p)->set_section_addresses(target, this, |
3562 | false, addr, | |
fd064a5b | 3563 | &increase_relro, |
fc497986 | 3564 | &has_relro, |
2e702c99 | 3565 | &off, pshndx); |
75f65a3e ILT |
3566 | |
3567 | // Now that we know the size of this segment, we may be able | |
3568 | // to save a page in memory, at the cost of wasting some | |
3569 | // file space, by instead aligning to the start of a new | |
3570 | // page. Here we use the real machine page size rather than | |
fc497986 CC |
3571 | // the ABI mandated page size. If the segment has been |
3572 | // aligned so that the relro data ends at a page boundary, | |
3573 | // we do not try to realign it. | |
75f65a3e | 3574 | |
cdc29364 CC |
3575 | if (!are_addresses_set |
3576 | && !has_relro | |
3577 | && aligned_addr != addr | |
fb0e076f | 3578 | && !parameters->incremental()) |
75f65a3e | 3579 | { |
75f65a3e ILT |
3580 | uint64_t first_off = (common_pagesize |
3581 | - (aligned_addr | |
3582 | & (common_pagesize - 1))); | |
3583 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
3584 | if (first_off > 0 | |
3585 | && last_off > 0 | |
3586 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
3587 | != (new_addr & ~ (common_pagesize - 1))) | |
3588 | && first_off + last_off <= common_pagesize) | |
3589 | { | |
ead1e424 ILT |
3590 | *pshndx = shndx_hold; |
3591 | addr = align_address(aligned_addr, common_pagesize); | |
a445fddf | 3592 | addr = align_address(addr, (*p)->maximum_alignment()); |
815a1205 AM |
3593 | if ((addr & (abi_pagesize - 1)) != 0) |
3594 | addr = addr + abi_pagesize; | |
75f65a3e | 3595 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
8a5e3e08 | 3596 | off = align_file_offset(off, addr, abi_pagesize); |
3bb951e5 ILT |
3597 | |
3598 | increase_relro = this->increase_relro_; | |
3599 | if (this->script_options_->saw_sections_clause()) | |
3600 | increase_relro = 0; | |
3601 | has_relro = false; | |
3602 | ||
eb426534 RM |
3603 | new_addr = (*p)->set_section_addresses(target, this, |
3604 | true, addr, | |
fd064a5b | 3605 | &increase_relro, |
fc497986 | 3606 | &has_relro, |
2e702c99 | 3607 | &off, pshndx); |
75f65a3e ILT |
3608 | } |
3609 | } | |
3610 | ||
3611 | addr = new_addr; | |
3612 | ||
34810851 ILT |
3613 | // Implement --check-sections. We know that the segments |
3614 | // are sorted by LMA. | |
3615 | if (check_sections && last_load_segment != NULL) | |
3616 | { | |
3617 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); | |
3618 | if (last_load_segment->paddr() + last_load_segment->memsz() | |
3619 | > (*p)->paddr()) | |
3620 | { | |
3621 | unsigned long long lb1 = last_load_segment->paddr(); | |
3622 | unsigned long long le1 = lb1 + last_load_segment->memsz(); | |
3623 | unsigned long long lb2 = (*p)->paddr(); | |
3624 | unsigned long long le2 = lb2 + (*p)->memsz(); | |
3625 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " | |
3626 | "[0x%llx -> 0x%llx]"), | |
3627 | lb1, le1, lb2, le2); | |
3628 | } | |
3629 | } | |
3630 | last_load_segment = *p; | |
75f65a3e ILT |
3631 | } |
3632 | } | |
3633 | ||
2e702c99 RM |
3634 | if (load_seg != NULL && target->isolate_execinstr()) |
3635 | { | |
3636 | // Process the early segments again, setting their file offsets | |
3637 | // so they land after the segments starting at LOAD_SEG. | |
3638 | off = align_file_offset(off, 0, target->abi_pagesize()); | |
3639 | ||
eb426534 RM |
3640 | this->reset_relax_output(); |
3641 | ||
2e702c99 RM |
3642 | for (Segment_list::iterator p = this->segment_list_.begin(); |
3643 | *p != load_seg; | |
3644 | ++p) | |
3645 | { | |
3646 | if ((*p)->type() == elfcpp::PT_LOAD) | |
3647 | { | |
3648 | // We repeat the whole job of assigning addresses and | |
3649 | // offsets, but we really only want to change the offsets and | |
3650 | // must ensure that the addresses all come out the same as | |
3651 | // they did the first time through. | |
3652 | bool has_relro = false; | |
3653 | const uint64_t old_addr = (*p)->vaddr(); | |
3654 | const uint64_t old_end = old_addr + (*p)->memsz(); | |
eb426534 RM |
3655 | uint64_t new_addr = (*p)->set_section_addresses(target, this, |
3656 | true, old_addr, | |
2e702c99 RM |
3657 | &increase_relro, |
3658 | &has_relro, | |
3659 | &off, | |
3660 | &shndx_begin); | |
3661 | gold_assert(new_addr == old_end); | |
3662 | } | |
3663 | } | |
3664 | ||
3665 | gold_assert(shndx_begin == shndx_load_seg); | |
3666 | } | |
3667 | ||
75f65a3e ILT |
3668 | // Handle the non-PT_LOAD segments, setting their offsets from their |
3669 | // section's offsets. | |
3670 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
3671 | p != this->segment_list_.end(); | |
3672 | ++p) | |
3673 | { | |
3674 | if ((*p)->type() != elfcpp::PT_LOAD) | |
1a2dff53 ILT |
3675 | (*p)->set_offset((*p)->type() == elfcpp::PT_GNU_RELRO |
3676 | ? increase_relro | |
3677 | : 0); | |
75f65a3e ILT |
3678 | } |
3679 | ||
7bf1f802 ILT |
3680 | // Set the TLS offsets for each section in the PT_TLS segment. |
3681 | if (this->tls_segment_ != NULL) | |
3682 | this->tls_segment_->set_tls_offsets(); | |
3683 | ||
75f65a3e ILT |
3684 | return off; |
3685 | } | |
3686 | ||
6a74a719 ILT |
3687 | // Set the offsets of all the allocated sections when doing a |
3688 | // relocatable link. This does the same jobs as set_segment_offsets, | |
3689 | // only for a relocatable link. | |
3690 | ||
3691 | off_t | |
3692 | Layout::set_relocatable_section_offsets(Output_data* file_header, | |
ca09d69a | 3693 | unsigned int* pshndx) |
6a74a719 ILT |
3694 | { |
3695 | off_t off = 0; | |
3696 | ||
3697 | file_header->set_address_and_file_offset(0, 0); | |
3698 | off += file_header->data_size(); | |
3699 | ||
3700 | for (Section_list::iterator p = this->section_list_.begin(); | |
3701 | p != this->section_list_.end(); | |
3702 | ++p) | |
3703 | { | |
3704 | // We skip unallocated sections here, except that group sections | |
3705 | // have to come first. | |
3706 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 | |
3707 | && (*p)->type() != elfcpp::SHT_GROUP) | |
3708 | continue; | |
3709 | ||
3710 | off = align_address(off, (*p)->addralign()); | |
3711 | ||
3712 | // The linker script might have set the address. | |
3713 | if (!(*p)->is_address_valid()) | |
3714 | (*p)->set_address(0); | |
3715 | (*p)->set_file_offset(off); | |
3716 | (*p)->finalize_data_size(); | |
e79c84aa CC |
3717 | if ((*p)->type() != elfcpp::SHT_NOBITS) |
3718 | off += (*p)->data_size(); | |
6a74a719 ILT |
3719 | |
3720 | (*p)->set_out_shndx(*pshndx); | |
3721 | ++*pshndx; | |
3722 | } | |
3723 | ||
3724 | return off; | |
3725 | } | |
3726 | ||
75f65a3e ILT |
3727 | // Set the file offset of all the sections not associated with a |
3728 | // segment. | |
3729 | ||
3730 | off_t | |
9a0910c3 | 3731 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 3732 | { |
cdc29364 CC |
3733 | off_t startoff = off; |
3734 | off_t maxoff = off; | |
3735 | ||
a3ad94ed ILT |
3736 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
3737 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
3738 | ++p) |
3739 | { | |
27bc2bce ILT |
3740 | // The symtab section is handled in create_symtab_sections. |
3741 | if (*p == this->symtab_section_) | |
61ba1cf9 | 3742 | continue; |
27bc2bce | 3743 | |
a9a60db6 ILT |
3744 | // If we've already set the data size, don't set it again. |
3745 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) | |
3746 | continue; | |
3747 | ||
96803768 ILT |
3748 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
3749 | && (*p)->requires_postprocessing()) | |
17a1d0a9 ILT |
3750 | { |
3751 | (*p)->create_postprocessing_buffer(); | |
3752 | this->any_postprocessing_sections_ = true; | |
3753 | } | |
96803768 | 3754 | |
9a0910c3 | 3755 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2e702c99 RM |
3756 | && (*p)->after_input_sections()) |
3757 | continue; | |
17a1d0a9 | 3758 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
2e702c99 RM |
3759 | && (!(*p)->after_input_sections() |
3760 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
3761 | continue; | |
17a1d0a9 | 3762 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
2e702c99 RM |
3763 | && (!(*p)->after_input_sections() |
3764 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
3765 | continue; | |
27bc2bce | 3766 | |
cdc29364 CC |
3767 | if (!parameters->incremental_update()) |
3768 | { | |
3769 | off = align_address(off, (*p)->addralign()); | |
3770 | (*p)->set_file_offset(off); | |
3771 | (*p)->finalize_data_size(); | |
3772 | } | |
3773 | else | |
3774 | { | |
3775 | // Incremental update: allocate file space from free list. | |
3776 | (*p)->pre_finalize_data_size(); | |
3777 | off_t current_size = (*p)->current_data_size(); | |
3778 | off = this->allocate(current_size, (*p)->addralign(), startoff); | |
3779 | if (off == -1) | |
3780 | { | |
3781 | if (is_debugging_enabled(DEBUG_INCREMENTAL)) | |
2e702c99 | 3782 | this->free_list_.dump(); |
cdc29364 | 3783 | gold_assert((*p)->output_section() != NULL); |
e6455dfb CC |
3784 | gold_fallback(_("out of patch space for section %s; " |
3785 | "relink with --incremental-full"), | |
3786 | (*p)->output_section()->name()); | |
cdc29364 CC |
3787 | } |
3788 | (*p)->set_file_offset(off); | |
3789 | (*p)->finalize_data_size(); | |
3790 | if ((*p)->data_size() > current_size) | |
3791 | { | |
3792 | gold_assert((*p)->output_section() != NULL); | |
e6455dfb CC |
3793 | gold_fallback(_("%s: section changed size; " |
3794 | "relink with --incremental-full"), | |
3795 | (*p)->output_section()->name()); | |
cdc29364 CC |
3796 | } |
3797 | gold_debug(DEBUG_INCREMENTAL, | |
3798 | "set_section_offsets: %08lx %08lx %s", | |
3799 | static_cast<long>(off), | |
3800 | static_cast<long>((*p)->data_size()), | |
3801 | ((*p)->output_section() != NULL | |
3802 | ? (*p)->output_section()->name() : "(special)")); | |
3803 | } | |
3804 | ||
75f65a3e | 3805 | off += (*p)->data_size(); |
cdc29364 | 3806 | if (off > maxoff) |
2e702c99 | 3807 | maxoff = off; |
96803768 ILT |
3808 | |
3809 | // At this point the name must be set. | |
17a1d0a9 | 3810 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
96803768 | 3811 | this->namepool_.add((*p)->name(), false, NULL); |
75f65a3e | 3812 | } |
cdc29364 | 3813 | return maxoff; |
75f65a3e ILT |
3814 | } |
3815 | ||
86887060 ILT |
3816 | // Set the section indexes of all the sections not associated with a |
3817 | // segment. | |
3818 | ||
3819 | unsigned int | |
3820 | Layout::set_section_indexes(unsigned int shndx) | |
3821 | { | |
3822 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
3823 | p != this->unattached_section_list_.end(); | |
3824 | ++p) | |
3825 | { | |
d491d34e ILT |
3826 | if (!(*p)->has_out_shndx()) |
3827 | { | |
3828 | (*p)->set_out_shndx(shndx); | |
3829 | ++shndx; | |
3830 | } | |
86887060 ILT |
3831 | } |
3832 | return shndx; | |
3833 | } | |
3834 | ||
a445fddf ILT |
3835 | // Set the section addresses according to the linker script. This is |
3836 | // only called when we see a SECTIONS clause. This returns the | |
3837 | // program segment which should hold the file header and segment | |
3838 | // headers, if any. It will return NULL if they should not be in a | |
3839 | // segment. | |
3840 | ||
3841 | Output_segment* | |
3842 | Layout::set_section_addresses_from_script(Symbol_table* symtab) | |
20e6d0d6 DK |
3843 | { |
3844 | Script_sections* ss = this->script_options_->script_sections(); | |
3845 | gold_assert(ss->saw_sections_clause()); | |
3846 | return this->script_options_->set_section_addresses(symtab, this); | |
3847 | } | |
3848 | ||
3849 | // Place the orphan sections in the linker script. | |
3850 | ||
3851 | void | |
3852 | Layout::place_orphan_sections_in_script() | |
a445fddf ILT |
3853 | { |
3854 | Script_sections* ss = this->script_options_->script_sections(); | |
3855 | gold_assert(ss->saw_sections_clause()); | |
3856 | ||
3857 | // Place each orphaned output section in the script. | |
3858 | for (Section_list::iterator p = this->section_list_.begin(); | |
3859 | p != this->section_list_.end(); | |
3860 | ++p) | |
3861 | { | |
3862 | if (!(*p)->found_in_sections_clause()) | |
3863 | ss->place_orphan(*p); | |
3864 | } | |
a445fddf ILT |
3865 | } |
3866 | ||
7bf1f802 ILT |
3867 | // Count the local symbols in the regular symbol table and the dynamic |
3868 | // symbol table, and build the respective string pools. | |
3869 | ||
3870 | void | |
17a1d0a9 ILT |
3871 | Layout::count_local_symbols(const Task* task, |
3872 | const Input_objects* input_objects) | |
7bf1f802 | 3873 | { |
6d013333 ILT |
3874 | // First, figure out an upper bound on the number of symbols we'll |
3875 | // be inserting into each pool. This helps us create the pools with | |
3876 | // the right size, to avoid unnecessary hashtable resizing. | |
3877 | unsigned int symbol_count = 0; | |
3878 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
3879 | p != input_objects->relobj_end(); | |
3880 | ++p) | |
3881 | symbol_count += (*p)->local_symbol_count(); | |
3882 | ||
3883 | // Go from "upper bound" to "estimate." We overcount for two | |
3884 | // reasons: we double-count symbols that occur in more than one | |
3885 | // object file, and we count symbols that are dropped from the | |
3886 | // output. Add it all together and assume we overcount by 100%. | |
3887 | symbol_count /= 2; | |
3888 | ||
3889 | // We assume all symbols will go into both the sympool and dynpool. | |
3890 | this->sympool_.reserve(symbol_count); | |
3891 | this->dynpool_.reserve(symbol_count); | |
3892 | ||
7bf1f802 ILT |
3893 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
3894 | p != input_objects->relobj_end(); | |
3895 | ++p) | |
3896 | { | |
17a1d0a9 | 3897 | Task_lock_obj<Object> tlo(task, *p); |
7bf1f802 ILT |
3898 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
3899 | } | |
3900 | } | |
3901 | ||
b8e6aad9 ILT |
3902 | // Create the symbol table sections. Here we also set the final |
3903 | // values of the symbols. At this point all the loadable sections are | |
d491d34e | 3904 | // fully laid out. SHNUM is the number of sections so far. |
75f65a3e ILT |
3905 | |
3906 | void | |
9025d29d | 3907 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 3908 | Symbol_table* symtab, |
d491d34e | 3909 | unsigned int shnum, |
16649710 | 3910 | off_t* poff) |
75f65a3e | 3911 | { |
61ba1cf9 ILT |
3912 | int symsize; |
3913 | unsigned int align; | |
8851ecca | 3914 | if (parameters->target().get_size() == 32) |
61ba1cf9 ILT |
3915 | { |
3916 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
3917 | align = 4; | |
3918 | } | |
8851ecca | 3919 | else if (parameters->target().get_size() == 64) |
61ba1cf9 ILT |
3920 | { |
3921 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
3922 | align = 8; | |
3923 | } | |
3924 | else | |
a3ad94ed | 3925 | gold_unreachable(); |
61ba1cf9 | 3926 | |
cdc29364 CC |
3927 | // Compute file offsets relative to the start of the symtab section. |
3928 | off_t off = 0; | |
61ba1cf9 ILT |
3929 | |
3930 | // Save space for the dummy symbol at the start of the section. We | |
3931 | // never bother to write this out--it will just be left as zero. | |
3932 | off += symsize; | |
c06b7b0b | 3933 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 3934 | |
a3ad94ed ILT |
3935 | // Add STT_SECTION symbols for each Output section which needs one. |
3936 | for (Section_list::iterator p = this->section_list_.begin(); | |
3937 | p != this->section_list_.end(); | |
3938 | ++p) | |
3939 | { | |
3940 | if (!(*p)->needs_symtab_index()) | |
3941 | (*p)->set_symtab_index(-1U); | |
3942 | else | |
3943 | { | |
3944 | (*p)->set_symtab_index(local_symbol_index); | |
3945 | ++local_symbol_index; | |
3946 | off += symsize; | |
3947 | } | |
3948 | } | |
3949 | ||
f6ce93d6 ILT |
3950 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
3951 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
3952 | ++p) |
3953 | { | |
c06b7b0b | 3954 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
2e702c99 | 3955 | off, symtab); |
c06b7b0b ILT |
3956 | off += (index - local_symbol_index) * symsize; |
3957 | local_symbol_index = index; | |
75f65a3e ILT |
3958 | } |
3959 | ||
c06b7b0b | 3960 | unsigned int local_symcount = local_symbol_index; |
cdc29364 | 3961 | gold_assert(static_cast<off_t>(local_symcount * symsize) == off); |
61ba1cf9 | 3962 | |
16649710 ILT |
3963 | off_t dynoff; |
3964 | size_t dyn_global_index; | |
3965 | size_t dyncount; | |
3966 | if (this->dynsym_section_ == NULL) | |
3967 | { | |
3968 | dynoff = 0; | |
3969 | dyn_global_index = 0; | |
3970 | dyncount = 0; | |
3971 | } | |
3972 | else | |
3973 | { | |
3974 | dyn_global_index = this->dynsym_section_->info(); | |
3975 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); | |
3976 | dynoff = this->dynsym_section_->offset() + locsize; | |
3977 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 3978 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
3979 | == this->dynsym_section_->data_size() - locsize); |
3980 | } | |
3981 | ||
cdc29364 | 3982 | off_t global_off = off; |
55a93433 ILT |
3983 | off = symtab->finalize(off, dynoff, dyn_global_index, dyncount, |
3984 | &this->sympool_, &local_symcount); | |
75f65a3e | 3985 | |
8851ecca | 3986 | if (!parameters->options().strip_all()) |
9e2dcb77 ILT |
3987 | { |
3988 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 3989 | |
cfd73a4e | 3990 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
3991 | Output_section* osymtab = this->make_output_section(symtab_name, |
3992 | elfcpp::SHT_SYMTAB, | |
22f0da72 ILT |
3993 | 0, ORDER_INVALID, |
3994 | false); | |
9e2dcb77 | 3995 | this->symtab_section_ = osymtab; |
a3ad94ed | 3996 | |
cdc29364 | 3997 | Output_section_data* pos = new Output_data_fixed_space(off, align, |
7d9e3d98 | 3998 | "** symtab"); |
9e2dcb77 | 3999 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 4000 | |
d491d34e ILT |
4001 | // We generate a .symtab_shndx section if we have more than |
4002 | // SHN_LORESERVE sections. Technically it is possible that we | |
4003 | // don't need one, because it is possible that there are no | |
4004 | // symbols in any of sections with indexes larger than | |
4005 | // SHN_LORESERVE. That is probably unusual, though, and it is | |
4006 | // easier to always create one than to compute section indexes | |
4007 | // twice (once here, once when writing out the symbols). | |
4008 | if (shnum >= elfcpp::SHN_LORESERVE) | |
4009 | { | |
4010 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", | |
4011 | false, NULL); | |
4012 | Output_section* osymtab_xindex = | |
4013 | this->make_output_section(symtab_xindex_name, | |
22f0da72 ILT |
4014 | elfcpp::SHT_SYMTAB_SHNDX, 0, |
4015 | ORDER_INVALID, false); | |
d491d34e | 4016 | |
cdc29364 | 4017 | size_t symcount = off / symsize; |
d491d34e ILT |
4018 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); |
4019 | ||
4020 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); | |
4021 | ||
4022 | osymtab_xindex->set_link_section(osymtab); | |
4023 | osymtab_xindex->set_addralign(4); | |
4024 | osymtab_xindex->set_entsize(4); | |
4025 | ||
4026 | osymtab_xindex->set_after_input_sections(); | |
4027 | ||
4028 | // This tells the driver code to wait until the symbol table | |
4029 | // has written out before writing out the postprocessing | |
4030 | // sections, including the .symtab_shndx section. | |
4031 | this->any_postprocessing_sections_ = true; | |
4032 | } | |
4033 | ||
cfd73a4e | 4034 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
4035 | Output_section* ostrtab = this->make_output_section(strtab_name, |
4036 | elfcpp::SHT_STRTAB, | |
22f0da72 ILT |
4037 | 0, ORDER_INVALID, |
4038 | false); | |
a3ad94ed | 4039 | |
9e2dcb77 ILT |
4040 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
4041 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 4042 | |
cdc29364 CC |
4043 | off_t symtab_off; |
4044 | if (!parameters->incremental_update()) | |
4045 | symtab_off = align_address(*poff, align); | |
4046 | else | |
4047 | { | |
4048 | symtab_off = this->allocate(off, align, *poff); | |
2e702c99 | 4049 | if (off == -1) |
e6455dfb CC |
4050 | gold_fallback(_("out of patch space for symbol table; " |
4051 | "relink with --incremental-full")); | |
cdc29364 CC |
4052 | gold_debug(DEBUG_INCREMENTAL, |
4053 | "create_symtab_sections: %08lx %08lx .symtab", | |
4054 | static_cast<long>(symtab_off), | |
4055 | static_cast<long>(off)); | |
4056 | } | |
4057 | ||
4058 | symtab->set_file_offset(symtab_off + global_off); | |
4059 | osymtab->set_file_offset(symtab_off); | |
27bc2bce | 4060 | osymtab->finalize_data_size(); |
9e2dcb77 ILT |
4061 | osymtab->set_link_section(ostrtab); |
4062 | osymtab->set_info(local_symcount); | |
4063 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 4064 | |
cdc29364 CC |
4065 | if (symtab_off + off > *poff) |
4066 | *poff = symtab_off + off; | |
9e2dcb77 | 4067 | } |
75f65a3e ILT |
4068 | } |
4069 | ||
4070 | // Create the .shstrtab section, which holds the names of the | |
4071 | // sections. At the time this is called, we have created all the | |
4072 | // output sections except .shstrtab itself. | |
4073 | ||
4074 | Output_section* | |
4075 | Layout::create_shstrtab() | |
4076 | { | |
4077 | // FIXME: We don't need to create a .shstrtab section if we are | |
4078 | // stripping everything. | |
4079 | ||
cfd73a4e | 4080 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 4081 | |
f5c870d2 | 4082 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0, |
22f0da72 | 4083 | ORDER_INVALID, false); |
75f65a3e | 4084 | |
0e0d5469 ILT |
4085 | if (strcmp(parameters->options().compress_debug_sections(), "none") != 0) |
4086 | { | |
4087 | // We can't write out this section until we've set all the | |
4088 | // section names, and we don't set the names of compressed | |
4089 | // output sections until relocations are complete. FIXME: With | |
4090 | // the current names we use, this is unnecessary. | |
4091 | os->set_after_input_sections(); | |
4092 | } | |
27bc2bce | 4093 | |
a3ad94ed ILT |
4094 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
4095 | os->add_output_section_data(posd); | |
75f65a3e ILT |
4096 | |
4097 | return os; | |
4098 | } | |
4099 | ||
4100 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
4101 | // offset. | |
4102 | ||
27bc2bce | 4103 | void |
d491d34e | 4104 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
75f65a3e ILT |
4105 | { |
4106 | Output_section_headers* oshdrs; | |
9025d29d | 4107 | oshdrs = new Output_section_headers(this, |
16649710 | 4108 | &this->segment_list_, |
6a74a719 | 4109 | &this->section_list_, |
16649710 | 4110 | &this->unattached_section_list_, |
d491d34e ILT |
4111 | &this->namepool_, |
4112 | shstrtab_section); | |
cdc29364 CC |
4113 | off_t off; |
4114 | if (!parameters->incremental_update()) | |
4115 | off = align_address(*poff, oshdrs->addralign()); | |
4116 | else | |
4117 | { | |
4118 | oshdrs->pre_finalize_data_size(); | |
4119 | off = this->allocate(oshdrs->data_size(), oshdrs->addralign(), *poff); | |
4120 | if (off == -1) | |
e6455dfb CC |
4121 | gold_fallback(_("out of patch space for section header table; " |
4122 | "relink with --incremental-full")); | |
cdc29364 CC |
4123 | gold_debug(DEBUG_INCREMENTAL, |
4124 | "create_shdrs: %08lx %08lx (section header table)", | |
4125 | static_cast<long>(off), | |
4126 | static_cast<long>(off + oshdrs->data_size())); | |
4127 | } | |
27bc2bce | 4128 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 | 4129 | off += oshdrs->data_size(); |
cdc29364 CC |
4130 | if (off > *poff) |
4131 | *poff = off; | |
27bc2bce | 4132 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
4133 | } |
4134 | ||
d491d34e ILT |
4135 | // Count the allocated sections. |
4136 | ||
4137 | size_t | |
4138 | Layout::allocated_output_section_count() const | |
4139 | { | |
4140 | size_t section_count = 0; | |
4141 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4142 | p != this->segment_list_.end(); | |
4143 | ++p) | |
4144 | section_count += (*p)->output_section_count(); | |
4145 | return section_count; | |
4146 | } | |
4147 | ||
dbe717ef ILT |
4148 | // Create the dynamic symbol table. |
4149 | ||
4150 | void | |
7bf1f802 | 4151 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
2e702c99 | 4152 | Symbol_table* symtab, |
ca09d69a | 4153 | Output_section** pdynstr, |
14b31740 ILT |
4154 | unsigned int* plocal_dynamic_count, |
4155 | std::vector<Symbol*>* pdynamic_symbols, | |
4156 | Versions* pversions) | |
dbe717ef | 4157 | { |
a3ad94ed ILT |
4158 | // Count all the symbols in the dynamic symbol table, and set the |
4159 | // dynamic symbol indexes. | |
dbe717ef | 4160 | |
a3ad94ed ILT |
4161 | // Skip symbol 0, which is always all zeroes. |
4162 | unsigned int index = 1; | |
dbe717ef | 4163 | |
a3ad94ed ILT |
4164 | // Add STT_SECTION symbols for each Output section which needs one. |
4165 | for (Section_list::iterator p = this->section_list_.begin(); | |
4166 | p != this->section_list_.end(); | |
4167 | ++p) | |
4168 | { | |
4169 | if (!(*p)->needs_dynsym_index()) | |
4170 | (*p)->set_dynsym_index(-1U); | |
4171 | else | |
4172 | { | |
4173 | (*p)->set_dynsym_index(index); | |
4174 | ++index; | |
4175 | } | |
4176 | } | |
4177 | ||
7bf1f802 ILT |
4178 | // Count the local symbols that need to go in the dynamic symbol table, |
4179 | // and set the dynamic symbol indexes. | |
4180 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
4181 | p != input_objects->relobj_end(); | |
4182 | ++p) | |
4183 | { | |
4184 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
4185 | index = new_index; | |
4186 | } | |
a3ad94ed ILT |
4187 | |
4188 | unsigned int local_symcount = index; | |
14b31740 | 4189 | *plocal_dynamic_count = local_symcount; |
a3ad94ed | 4190 | |
9b07f471 | 4191 | index = symtab->set_dynsym_indexes(index, pdynamic_symbols, |
35cdfc9a | 4192 | &this->dynpool_, pversions); |
a3ad94ed ILT |
4193 | |
4194 | int symsize; | |
4195 | unsigned int align; | |
8851ecca | 4196 | const int size = parameters->target().get_size(); |
a3ad94ed ILT |
4197 | if (size == 32) |
4198 | { | |
4199 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
4200 | align = 4; | |
4201 | } | |
4202 | else if (size == 64) | |
4203 | { | |
4204 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
4205 | align = 8; | |
4206 | } | |
4207 | else | |
4208 | gold_unreachable(); | |
4209 | ||
14b31740 ILT |
4210 | // Create the dynamic symbol table section. |
4211 | ||
3802b2dd ILT |
4212 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
4213 | elfcpp::SHT_DYNSYM, | |
4214 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
4215 | false, |
4216 | ORDER_DYNAMIC_LINKER, | |
4217 | false); | |
a3ad94ed | 4218 | |
6daf5215 ILT |
4219 | // Check for NULL as a linker script may discard .dynsym. |
4220 | if (dynsym != NULL) | |
4221 | { | |
4222 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, | |
4223 | align, | |
4224 | "** dynsym"); | |
4225 | dynsym->add_output_section_data(odata); | |
a3ad94ed | 4226 | |
6daf5215 ILT |
4227 | dynsym->set_info(local_symcount); |
4228 | dynsym->set_entsize(symsize); | |
4229 | dynsym->set_addralign(align); | |
a3ad94ed | 4230 | |
6daf5215 ILT |
4231 | this->dynsym_section_ = dynsym; |
4232 | } | |
a3ad94ed | 4233 | |
16649710 | 4234 | Output_data_dynamic* const odyn = this->dynamic_data_; |
6daf5215 ILT |
4235 | if (odyn != NULL) |
4236 | { | |
4237 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); | |
4238 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
4239 | } | |
a3ad94ed | 4240 | |
d491d34e ILT |
4241 | // If there are more than SHN_LORESERVE allocated sections, we |
4242 | // create a .dynsym_shndx section. It is possible that we don't | |
4243 | // need one, because it is possible that there are no dynamic | |
4244 | // symbols in any of the sections with indexes larger than | |
4245 | // SHN_LORESERVE. This is probably unusual, though, and at this | |
4246 | // time we don't know the actual section indexes so it is | |
4247 | // inconvenient to check. | |
4248 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) | |
4249 | { | |
2ea97941 | 4250 | Output_section* dynsym_xindex = |
d491d34e ILT |
4251 | this->choose_output_section(NULL, ".dynsym_shndx", |
4252 | elfcpp::SHT_SYMTAB_SHNDX, | |
4253 | elfcpp::SHF_ALLOC, | |
22f0da72 | 4254 | false, ORDER_DYNAMIC_LINKER, false); |
d491d34e | 4255 | |
6daf5215 ILT |
4256 | if (dynsym_xindex != NULL) |
4257 | { | |
4258 | this->dynsym_xindex_ = new Output_symtab_xindex(index); | |
d491d34e | 4259 | |
6daf5215 | 4260 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); |
d491d34e | 4261 | |
6daf5215 ILT |
4262 | dynsym_xindex->set_link_section(dynsym); |
4263 | dynsym_xindex->set_addralign(4); | |
4264 | dynsym_xindex->set_entsize(4); | |
d491d34e | 4265 | |
6daf5215 | 4266 | dynsym_xindex->set_after_input_sections(); |
d491d34e | 4267 | |
6daf5215 ILT |
4268 | // This tells the driver code to wait until the symbol table |
4269 | // has written out before writing out the postprocessing | |
4270 | // sections, including the .dynsym_shndx section. | |
4271 | this->any_postprocessing_sections_ = true; | |
4272 | } | |
d491d34e ILT |
4273 | } |
4274 | ||
14b31740 ILT |
4275 | // Create the dynamic string table section. |
4276 | ||
3802b2dd ILT |
4277 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
4278 | elfcpp::SHT_STRTAB, | |
4279 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
4280 | false, |
4281 | ORDER_DYNAMIC_LINKER, | |
4282 | false); | |
117be58f | 4283 | *pdynstr = dynstr; |
6daf5215 ILT |
4284 | if (dynstr != NULL) |
4285 | { | |
4286 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
4287 | dynstr->add_output_section_data(strdata); | |
a3ad94ed | 4288 | |
6daf5215 ILT |
4289 | if (dynsym != NULL) |
4290 | dynsym->set_link_section(dynstr); | |
4291 | if (this->dynamic_section_ != NULL) | |
4292 | this->dynamic_section_->set_link_section(dynstr); | |
16649710 | 4293 | |
6daf5215 ILT |
4294 | if (odyn != NULL) |
4295 | { | |
4296 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); | |
4297 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
4298 | } | |
6daf5215 | 4299 | } |
14b31740 ILT |
4300 | |
4301 | // Create the hash tables. | |
4302 | ||
13670ee6 ILT |
4303 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
4304 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
4305 | { | |
4306 | unsigned char* phash; | |
4307 | unsigned int hashlen; | |
4308 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, | |
4309 | &phash, &hashlen); | |
4310 | ||
22f0da72 ILT |
4311 | Output_section* hashsec = |
4312 | this->choose_output_section(NULL, ".hash", elfcpp::SHT_HASH, | |
4313 | elfcpp::SHF_ALLOC, false, | |
4314 | ORDER_DYNAMIC_LINKER, false); | |
13670ee6 ILT |
4315 | |
4316 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
4317 | hashlen, | |
7d9e3d98 ILT |
4318 | align, |
4319 | "** hash"); | |
6daf5215 ILT |
4320 | if (hashsec != NULL && hashdata != NULL) |
4321 | hashsec->add_output_section_data(hashdata); | |
13670ee6 | 4322 | |
6daf5215 ILT |
4323 | if (hashsec != NULL) |
4324 | { | |
4325 | if (dynsym != NULL) | |
4326 | hashsec->set_link_section(dynsym); | |
4327 | hashsec->set_entsize(4); | |
4328 | } | |
a3ad94ed | 4329 | |
6daf5215 ILT |
4330 | if (odyn != NULL) |
4331 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); | |
13670ee6 ILT |
4332 | } |
4333 | ||
4334 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 | |
4335 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
4336 | { | |
4337 | unsigned char* phash; | |
4338 | unsigned int hashlen; | |
4339 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, local_symcount, | |
4340 | &phash, &hashlen); | |
a3ad94ed | 4341 | |
22f0da72 ILT |
4342 | Output_section* hashsec = |
4343 | this->choose_output_section(NULL, ".gnu.hash", elfcpp::SHT_GNU_HASH, | |
4344 | elfcpp::SHF_ALLOC, false, | |
4345 | ORDER_DYNAMIC_LINKER, false); | |
a3ad94ed | 4346 | |
13670ee6 ILT |
4347 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
4348 | hashlen, | |
7d9e3d98 ILT |
4349 | align, |
4350 | "** hash"); | |
6daf5215 ILT |
4351 | if (hashsec != NULL && hashdata != NULL) |
4352 | hashsec->add_output_section_data(hashdata); | |
a3ad94ed | 4353 | |
6daf5215 ILT |
4354 | if (hashsec != NULL) |
4355 | { | |
4356 | if (dynsym != NULL) | |
4357 | hashsec->set_link_section(dynsym); | |
1b81fb71 | 4358 | |
6daf5215 ILT |
4359 | // For a 64-bit target, the entries in .gnu.hash do not have |
4360 | // a uniform size, so we only set the entry size for a | |
4361 | // 32-bit target. | |
4362 | if (parameters->target().get_size() == 32) | |
4363 | hashsec->set_entsize(4); | |
a3ad94ed | 4364 | |
6daf5215 ILT |
4365 | if (odyn != NULL) |
4366 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); | |
4367 | } | |
13670ee6 | 4368 | } |
dbe717ef ILT |
4369 | } |
4370 | ||
7bf1f802 ILT |
4371 | // Assign offsets to each local portion of the dynamic symbol table. |
4372 | ||
4373 | void | |
4374 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
4375 | { | |
4376 | Output_section* dynsym = this->dynsym_section_; | |
6daf5215 ILT |
4377 | if (dynsym == NULL) |
4378 | return; | |
7bf1f802 ILT |
4379 | |
4380 | off_t off = dynsym->offset(); | |
4381 | ||
4382 | // Skip the dummy symbol at the start of the section. | |
4383 | off += dynsym->entsize(); | |
4384 | ||
4385 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
4386 | p != input_objects->relobj_end(); | |
4387 | ++p) | |
4388 | { | |
4389 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
4390 | off += count * dynsym->entsize(); | |
4391 | } | |
4392 | } | |
4393 | ||
14b31740 ILT |
4394 | // Create the version sections. |
4395 | ||
4396 | void | |
9025d29d | 4397 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 4398 | const Symbol_table* symtab, |
14b31740 ILT |
4399 | unsigned int local_symcount, |
4400 | const std::vector<Symbol*>& dynamic_symbols, | |
4401 | const Output_section* dynstr) | |
4402 | { | |
4403 | if (!versions->any_defs() && !versions->any_needs()) | |
4404 | return; | |
4405 | ||
8851ecca | 4406 | switch (parameters->size_and_endianness()) |
14b31740 | 4407 | { |
193a53d9 | 4408 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 4409 | case Parameters::TARGET_32_LITTLE: |
7d1a9ebb ILT |
4410 | this->sized_create_version_sections<32, false>(versions, symtab, |
4411 | local_symcount, | |
4412 | dynamic_symbols, dynstr); | |
8851ecca | 4413 | break; |
193a53d9 | 4414 | #endif |
8851ecca ILT |
4415 | #ifdef HAVE_TARGET_32_BIG |
4416 | case Parameters::TARGET_32_BIG: | |
7d1a9ebb ILT |
4417 | this->sized_create_version_sections<32, true>(versions, symtab, |
4418 | local_symcount, | |
4419 | dynamic_symbols, dynstr); | |
8851ecca | 4420 | break; |
193a53d9 | 4421 | #endif |
193a53d9 | 4422 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 4423 | case Parameters::TARGET_64_LITTLE: |
7d1a9ebb ILT |
4424 | this->sized_create_version_sections<64, false>(versions, symtab, |
4425 | local_symcount, | |
4426 | dynamic_symbols, dynstr); | |
8851ecca | 4427 | break; |
193a53d9 | 4428 | #endif |
8851ecca ILT |
4429 | #ifdef HAVE_TARGET_64_BIG |
4430 | case Parameters::TARGET_64_BIG: | |
7d1a9ebb ILT |
4431 | this->sized_create_version_sections<64, true>(versions, symtab, |
4432 | local_symcount, | |
4433 | dynamic_symbols, dynstr); | |
8851ecca ILT |
4434 | break; |
4435 | #endif | |
4436 | default: | |
4437 | gold_unreachable(); | |
14b31740 | 4438 | } |
14b31740 ILT |
4439 | } |
4440 | ||
4441 | // Create the version sections, sized version. | |
4442 | ||
4443 | template<int size, bool big_endian> | |
4444 | void | |
4445 | Layout::sized_create_version_sections( | |
4446 | const Versions* versions, | |
46fe1623 | 4447 | const Symbol_table* symtab, |
14b31740 ILT |
4448 | unsigned int local_symcount, |
4449 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 4450 | const Output_section* dynstr) |
14b31740 | 4451 | { |
3802b2dd ILT |
4452 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
4453 | elfcpp::SHT_GNU_versym, | |
4454 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
4455 | false, |
4456 | ORDER_DYNAMIC_LINKER, | |
4457 | false); | |
14b31740 | 4458 | |
6daf5215 ILT |
4459 | // Check for NULL since a linker script may discard this section. |
4460 | if (vsec != NULL) | |
4461 | { | |
4462 | unsigned char* vbuf; | |
4463 | unsigned int vsize; | |
4464 | versions->symbol_section_contents<size, big_endian>(symtab, | |
4465 | &this->dynpool_, | |
4466 | local_symcount, | |
4467 | dynamic_symbols, | |
4468 | &vbuf, &vsize); | |
4469 | ||
4470 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, | |
4471 | "** versions"); | |
4472 | ||
4473 | vsec->add_output_section_data(vdata); | |
4474 | vsec->set_entsize(2); | |
4475 | vsec->set_link_section(this->dynsym_section_); | |
4476 | } | |
14b31740 ILT |
4477 | |
4478 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
6daf5215 ILT |
4479 | if (odyn != NULL && vsec != NULL) |
4480 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
14b31740 ILT |
4481 | |
4482 | if (versions->any_defs()) | |
4483 | { | |
3802b2dd | 4484 | Output_section* vdsec; |
6daf5215 ILT |
4485 | vdsec = this->choose_output_section(NULL, ".gnu.version_d", |
4486 | elfcpp::SHT_GNU_verdef, | |
4487 | elfcpp::SHF_ALLOC, | |
4488 | false, ORDER_DYNAMIC_LINKER, false); | |
4489 | ||
4490 | if (vdsec != NULL) | |
4491 | { | |
4492 | unsigned char* vdbuf; | |
4493 | unsigned int vdsize; | |
4494 | unsigned int vdentries; | |
4495 | versions->def_section_contents<size, big_endian>(&this->dynpool_, | |
4496 | &vdbuf, &vdsize, | |
4497 | &vdentries); | |
4498 | ||
4499 | Output_section_data* vddata = | |
4500 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); | |
4501 | ||
4502 | vdsec->add_output_section_data(vddata); | |
4503 | vdsec->set_link_section(dynstr); | |
4504 | vdsec->set_info(vdentries); | |
4505 | ||
4506 | if (odyn != NULL) | |
4507 | { | |
4508 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
4509 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
4510 | } | |
4511 | } | |
14b31740 ILT |
4512 | } |
4513 | ||
4514 | if (versions->any_needs()) | |
4515 | { | |
14b31740 | 4516 | Output_section* vnsec; |
3802b2dd ILT |
4517 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
4518 | elfcpp::SHT_GNU_verneed, | |
4519 | elfcpp::SHF_ALLOC, | |
22f0da72 | 4520 | false, ORDER_DYNAMIC_LINKER, false); |
14b31740 | 4521 | |
6daf5215 ILT |
4522 | if (vnsec != NULL) |
4523 | { | |
4524 | unsigned char* vnbuf; | |
4525 | unsigned int vnsize; | |
4526 | unsigned int vnentries; | |
4527 | versions->need_section_contents<size, big_endian>(&this->dynpool_, | |
4528 | &vnbuf, &vnsize, | |
4529 | &vnentries); | |
14b31740 | 4530 | |
6daf5215 ILT |
4531 | Output_section_data* vndata = |
4532 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); | |
14b31740 | 4533 | |
6daf5215 ILT |
4534 | vnsec->add_output_section_data(vndata); |
4535 | vnsec->set_link_section(dynstr); | |
4536 | vnsec->set_info(vnentries); | |
14b31740 | 4537 | |
6daf5215 ILT |
4538 | if (odyn != NULL) |
4539 | { | |
4540 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
4541 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
4542 | } | |
4543 | } | |
14b31740 ILT |
4544 | } |
4545 | } | |
4546 | ||
dbe717ef ILT |
4547 | // Create the .interp section and PT_INTERP segment. |
4548 | ||
4549 | void | |
4550 | Layout::create_interp(const Target* target) | |
4551 | { | |
10b4f102 ILT |
4552 | gold_assert(this->interp_segment_ == NULL); |
4553 | ||
e55bde5e | 4554 | const char* interp = parameters->options().dynamic_linker(); |
dbe717ef ILT |
4555 | if (interp == NULL) |
4556 | { | |
4557 | interp = target->dynamic_linker(); | |
a3ad94ed | 4558 | gold_assert(interp != NULL); |
dbe717ef ILT |
4559 | } |
4560 | ||
4561 | size_t len = strlen(interp) + 1; | |
4562 | ||
4563 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
4564 | ||
e1f74f98 ILT |
4565 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
4566 | elfcpp::SHT_PROGBITS, | |
4567 | elfcpp::SHF_ALLOC, | |
4568 | false, ORDER_INTERP, | |
4569 | false); | |
6daf5215 ILT |
4570 | if (osec != NULL) |
4571 | osec->add_output_section_data(odata); | |
dbe717ef ILT |
4572 | } |
4573 | ||
ea715a34 ILT |
4574 | // Add dynamic tags for the PLT and the dynamic relocs. This is |
4575 | // called by the target-specific code. This does nothing if not doing | |
4576 | // a dynamic link. | |
4577 | ||
4578 | // USE_REL is true for REL relocs rather than RELA relocs. | |
4579 | ||
4580 | // If PLT_GOT is not NULL, then DT_PLTGOT points to it. | |
4581 | ||
4582 | // If PLT_REL is not NULL, it is used for DT_PLTRELSZ, and DT_JMPREL, | |
e291e7b9 ILT |
4583 | // and we also set DT_PLTREL. We use PLT_REL's output section, since |
4584 | // some targets have multiple reloc sections in PLT_REL. | |
ea715a34 ILT |
4585 | |
4586 | // If DYN_REL is not NULL, it is used for DT_REL/DT_RELA, | |
67181c72 ILT |
4587 | // DT_RELSZ/DT_RELASZ, DT_RELENT/DT_RELAENT. Again we use the output |
4588 | // section. | |
ea715a34 ILT |
4589 | |
4590 | // If ADD_DEBUG is true, we add a DT_DEBUG entry when generating an | |
4591 | // executable. | |
4592 | ||
4593 | void | |
4594 | Layout::add_target_dynamic_tags(bool use_rel, const Output_data* plt_got, | |
4595 | const Output_data* plt_rel, | |
3a44184e | 4596 | const Output_data_reloc_generic* dyn_rel, |
612a8d3d | 4597 | bool add_debug, bool dynrel_includes_plt) |
ea715a34 ILT |
4598 | { |
4599 | Output_data_dynamic* odyn = this->dynamic_data_; | |
4600 | if (odyn == NULL) | |
4601 | return; | |
4602 | ||
4603 | if (plt_got != NULL && plt_got->output_section() != NULL) | |
4604 | odyn->add_section_address(elfcpp::DT_PLTGOT, plt_got); | |
4605 | ||
4606 | if (plt_rel != NULL && plt_rel->output_section() != NULL) | |
4607 | { | |
e291e7b9 ILT |
4608 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, plt_rel->output_section()); |
4609 | odyn->add_section_address(elfcpp::DT_JMPREL, plt_rel->output_section()); | |
ea715a34 ILT |
4610 | odyn->add_constant(elfcpp::DT_PLTREL, |
4611 | use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA); | |
4612 | } | |
4613 | ||
82435b3b ILT |
4614 | if ((dyn_rel != NULL && dyn_rel->output_section() != NULL) |
4615 | || (dynrel_includes_plt | |
4616 | && plt_rel != NULL | |
4617 | && plt_rel->output_section() != NULL)) | |
ea715a34 | 4618 | { |
82435b3b ILT |
4619 | bool have_dyn_rel = dyn_rel != NULL && dyn_rel->output_section() != NULL; |
4620 | bool have_plt_rel = plt_rel != NULL && plt_rel->output_section() != NULL; | |
ea715a34 | 4621 | odyn->add_section_address(use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA, |
82435b3b ILT |
4622 | (have_dyn_rel |
4623 | ? dyn_rel->output_section() | |
4624 | : plt_rel->output_section())); | |
4625 | elfcpp::DT size_tag = use_rel ? elfcpp::DT_RELSZ : elfcpp::DT_RELASZ; | |
4626 | if (have_dyn_rel && have_plt_rel && dynrel_includes_plt) | |
4627 | odyn->add_section_size(size_tag, | |
67181c72 ILT |
4628 | dyn_rel->output_section(), |
4629 | plt_rel->output_section()); | |
82435b3b ILT |
4630 | else if (have_dyn_rel) |
4631 | odyn->add_section_size(size_tag, dyn_rel->output_section()); | |
612a8d3d | 4632 | else |
82435b3b | 4633 | odyn->add_section_size(size_tag, plt_rel->output_section()); |
ea715a34 ILT |
4634 | const int size = parameters->target().get_size(); |
4635 | elfcpp::DT rel_tag; | |
4636 | int rel_size; | |
4637 | if (use_rel) | |
4638 | { | |
4639 | rel_tag = elfcpp::DT_RELENT; | |
4640 | if (size == 32) | |
4641 | rel_size = Reloc_types<elfcpp::SHT_REL, 32, false>::reloc_size; | |
4642 | else if (size == 64) | |
4643 | rel_size = Reloc_types<elfcpp::SHT_REL, 64, false>::reloc_size; | |
4644 | else | |
4645 | gold_unreachable(); | |
4646 | } | |
4647 | else | |
4648 | { | |
4649 | rel_tag = elfcpp::DT_RELAENT; | |
4650 | if (size == 32) | |
4651 | rel_size = Reloc_types<elfcpp::SHT_RELA, 32, false>::reloc_size; | |
4652 | else if (size == 64) | |
4653 | rel_size = Reloc_types<elfcpp::SHT_RELA, 64, false>::reloc_size; | |
4654 | else | |
4655 | gold_unreachable(); | |
4656 | } | |
4657 | odyn->add_constant(rel_tag, rel_size); | |
3a44184e | 4658 | |
82435b3b | 4659 | if (parameters->options().combreloc() && have_dyn_rel) |
3a44184e ILT |
4660 | { |
4661 | size_t c = dyn_rel->relative_reloc_count(); | |
4662 | if (c > 0) | |
4663 | odyn->add_constant((use_rel | |
4664 | ? elfcpp::DT_RELCOUNT | |
4665 | : elfcpp::DT_RELACOUNT), | |
4666 | c); | |
4667 | } | |
ea715a34 ILT |
4668 | } |
4669 | ||
4670 | if (add_debug && !parameters->options().shared()) | |
4671 | { | |
4672 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
4673 | // linker at run time, and used by the debugger. | |
4674 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
4675 | } | |
4676 | } | |
4677 | ||
a3ad94ed ILT |
4678 | // Finish the .dynamic section and PT_DYNAMIC segment. |
4679 | ||
4680 | void | |
4681 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 4682 | const Symbol_table* symtab) |
a3ad94ed | 4683 | { |
6daf5215 ILT |
4684 | if (!this->script_options_->saw_phdrs_clause() |
4685 | && this->dynamic_section_ != NULL) | |
1c4f3631 ILT |
4686 | { |
4687 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, | |
4688 | (elfcpp::PF_R | |
4689 | | elfcpp::PF_W)); | |
22f0da72 ILT |
4690 | oseg->add_output_section_to_nonload(this->dynamic_section_, |
4691 | elfcpp::PF_R | elfcpp::PF_W); | |
1c4f3631 | 4692 | } |
a3ad94ed | 4693 | |
16649710 | 4694 | Output_data_dynamic* const odyn = this->dynamic_data_; |
6daf5215 ILT |
4695 | if (odyn == NULL) |
4696 | return; | |
16649710 | 4697 | |
a3ad94ed ILT |
4698 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
4699 | p != input_objects->dynobj_end(); | |
4700 | ++p) | |
4701 | { | |
0f1c85a6 | 4702 | if (!(*p)->is_needed() && (*p)->as_needed()) |
594c8e5e ILT |
4703 | { |
4704 | // This dynamic object was linked with --as-needed, but it | |
4705 | // is not needed. | |
4706 | continue; | |
4707 | } | |
4708 | ||
a3ad94ed ILT |
4709 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); |
4710 | } | |
4711 | ||
8851ecca | 4712 | if (parameters->options().shared()) |
fced7afd | 4713 | { |
e55bde5e | 4714 | const char* soname = parameters->options().soname(); |
fced7afd ILT |
4715 | if (soname != NULL) |
4716 | odyn->add_string(elfcpp::DT_SONAME, soname); | |
4717 | } | |
4718 | ||
c6585162 | 4719 | Symbol* sym = symtab->lookup(parameters->options().init()); |
14b31740 | 4720 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
4721 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
4722 | ||
c6585162 | 4723 | sym = symtab->lookup(parameters->options().fini()); |
14b31740 | 4724 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
4725 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
4726 | ||
f15f61a7 DK |
4727 | // Look for .init_array, .preinit_array and .fini_array by checking |
4728 | // section types. | |
4729 | for(Layout::Section_list::const_iterator p = this->section_list_.begin(); | |
4730 | p != this->section_list_.end(); | |
4731 | ++p) | |
4732 | switch((*p)->type()) | |
4733 | { | |
4734 | case elfcpp::SHT_FINI_ARRAY: | |
4735 | odyn->add_section_address(elfcpp::DT_FINI_ARRAY, *p); | |
2e702c99 | 4736 | odyn->add_section_size(elfcpp::DT_FINI_ARRAYSZ, *p); |
f15f61a7 DK |
4737 | break; |
4738 | case elfcpp::SHT_INIT_ARRAY: | |
4739 | odyn->add_section_address(elfcpp::DT_INIT_ARRAY, *p); | |
2e702c99 | 4740 | odyn->add_section_size(elfcpp::DT_INIT_ARRAYSZ, *p); |
f15f61a7 DK |
4741 | break; |
4742 | case elfcpp::SHT_PREINIT_ARRAY: | |
4743 | odyn->add_section_address(elfcpp::DT_PREINIT_ARRAY, *p); | |
2e702c99 | 4744 | odyn->add_section_size(elfcpp::DT_PREINIT_ARRAYSZ, *p); |
f15f61a7 DK |
4745 | break; |
4746 | default: | |
4747 | break; | |
4748 | } | |
2e702c99 | 4749 | |
41f542e7 | 4750 | // Add a DT_RPATH entry if needed. |
e55bde5e | 4751 | const General_options::Dir_list& rpath(parameters->options().rpath()); |
41f542e7 ILT |
4752 | if (!rpath.empty()) |
4753 | { | |
4754 | std::string rpath_val; | |
4755 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
2e702c99 RM |
4756 | p != rpath.end(); |
4757 | ++p) | |
4758 | { | |
4759 | if (rpath_val.empty()) | |
4760 | rpath_val = p->name(); | |
4761 | else | |
4762 | { | |
4763 | // Eliminate duplicates. | |
4764 | General_options::Dir_list::const_iterator q; | |
4765 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 4766 | if (q->name() == p->name()) |
2e702c99 RM |
4767 | break; |
4768 | if (q == p) | |
4769 | { | |
4770 | rpath_val += ':'; | |
4771 | rpath_val += p->name(); | |
4772 | } | |
4773 | } | |
4774 | } | |
41f542e7 | 4775 | |
b1b00fcc MF |
4776 | if (!parameters->options().enable_new_dtags()) |
4777 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
4778 | else | |
7c414435 | 4779 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); |
41f542e7 | 4780 | } |
4f4c5f80 ILT |
4781 | |
4782 | // Look for text segments that have dynamic relocations. | |
4783 | bool have_textrel = false; | |
4e8fe71f | 4784 | if (!this->script_options_->saw_sections_clause()) |
4f4c5f80 | 4785 | { |
4e8fe71f | 4786 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
2e702c99 RM |
4787 | p != this->segment_list_.end(); |
4788 | ++p) | |
4789 | { | |
4790 | if ((*p)->type() == elfcpp::PT_LOAD | |
766f91bb | 4791 | && ((*p)->flags() & elfcpp::PF_W) == 0 |
2e702c99 RM |
4792 | && (*p)->has_dynamic_reloc()) |
4793 | { | |
4794 | have_textrel = true; | |
4795 | break; | |
4796 | } | |
4797 | } | |
4e8fe71f ILT |
4798 | } |
4799 | else | |
4800 | { | |
4801 | // We don't know the section -> segment mapping, so we are | |
4802 | // conservative and just look for readonly sections with | |
4803 | // relocations. If those sections wind up in writable segments, | |
4804 | // then we have created an unnecessary DT_TEXTREL entry. | |
4805 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
2e702c99 RM |
4806 | p != this->section_list_.end(); |
4807 | ++p) | |
4808 | { | |
4809 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 | |
4810 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 | |
4811 | && (*p)->has_dynamic_reloc()) | |
4812 | { | |
4813 | have_textrel = true; | |
4814 | break; | |
4815 | } | |
4816 | } | |
4f4c5f80 ILT |
4817 | } |
4818 | ||
886288f1 ILT |
4819 | if (parameters->options().filter() != NULL) |
4820 | odyn->add_string(elfcpp::DT_FILTER, parameters->options().filter()); | |
4821 | if (parameters->options().any_auxiliary()) | |
4822 | { | |
4823 | for (options::String_set::const_iterator p = | |
4824 | parameters->options().auxiliary_begin(); | |
4825 | p != parameters->options().auxiliary_end(); | |
4826 | ++p) | |
4827 | odyn->add_string(elfcpp::DT_AUXILIARY, *p); | |
4828 | } | |
4829 | ||
4830 | // Add a DT_FLAGS entry if necessary. | |
4f4c5f80 ILT |
4831 | unsigned int flags = 0; |
4832 | if (have_textrel) | |
6a41d30b ILT |
4833 | { |
4834 | // Add a DT_TEXTREL for compatibility with older loaders. | |
4835 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
4836 | flags |= elfcpp::DF_TEXTREL; | |
b9674e17 | 4837 | |
ffeef7df ILT |
4838 | if (parameters->options().text()) |
4839 | gold_error(_("read-only segment has dynamic relocations")); | |
4840 | else if (parameters->options().warn_shared_textrel() | |
4841 | && parameters->options().shared()) | |
b9674e17 | 4842 | gold_warning(_("shared library text segment is not shareable")); |
6a41d30b | 4843 | } |
8851ecca | 4844 | if (parameters->options().shared() && this->has_static_tls()) |
535890bb | 4845 | flags |= elfcpp::DF_STATIC_TLS; |
7be8330a CD |
4846 | if (parameters->options().origin()) |
4847 | flags |= elfcpp::DF_ORIGIN; | |
f15f61a7 DK |
4848 | if (parameters->options().Bsymbolic()) |
4849 | { | |
4850 | flags |= elfcpp::DF_SYMBOLIC; | |
4851 | // Add DT_SYMBOLIC for compatibility with older loaders. | |
4852 | odyn->add_constant(elfcpp::DT_SYMBOLIC, 0); | |
4853 | } | |
e1c74d60 ILT |
4854 | if (parameters->options().now()) |
4855 | flags |= elfcpp::DF_BIND_NOW; | |
0d212c3a ILT |
4856 | if (flags != 0) |
4857 | odyn->add_constant(elfcpp::DT_FLAGS, flags); | |
7c414435 DM |
4858 | |
4859 | flags = 0; | |
4860 | if (parameters->options().initfirst()) | |
4861 | flags |= elfcpp::DF_1_INITFIRST; | |
4862 | if (parameters->options().interpose()) | |
4863 | flags |= elfcpp::DF_1_INTERPOSE; | |
4864 | if (parameters->options().loadfltr()) | |
4865 | flags |= elfcpp::DF_1_LOADFLTR; | |
4866 | if (parameters->options().nodefaultlib()) | |
4867 | flags |= elfcpp::DF_1_NODEFLIB; | |
4868 | if (parameters->options().nodelete()) | |
4869 | flags |= elfcpp::DF_1_NODELETE; | |
4870 | if (parameters->options().nodlopen()) | |
4871 | flags |= elfcpp::DF_1_NOOPEN; | |
4872 | if (parameters->options().nodump()) | |
4873 | flags |= elfcpp::DF_1_NODUMP; | |
4874 | if (!parameters->options().shared()) | |
4875 | flags &= ~(elfcpp::DF_1_INITFIRST | |
4876 | | elfcpp::DF_1_NODELETE | |
4877 | | elfcpp::DF_1_NOOPEN); | |
7be8330a CD |
4878 | if (parameters->options().origin()) |
4879 | flags |= elfcpp::DF_1_ORIGIN; | |
e1c74d60 ILT |
4880 | if (parameters->options().now()) |
4881 | flags |= elfcpp::DF_1_NOW; | |
e2153196 ILT |
4882 | if (parameters->options().Bgroup()) |
4883 | flags |= elfcpp::DF_1_GROUP; | |
0d212c3a | 4884 | if (flags != 0) |
7c414435 | 4885 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); |
a3ad94ed ILT |
4886 | } |
4887 | ||
f0ba79e2 ILT |
4888 | // Set the size of the _DYNAMIC symbol table to be the size of the |
4889 | // dynamic data. | |
4890 | ||
4891 | void | |
4892 | Layout::set_dynamic_symbol_size(const Symbol_table* symtab) | |
4893 | { | |
4894 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
6daf5215 ILT |
4895 | if (odyn == NULL) |
4896 | return; | |
f0ba79e2 | 4897 | odyn->finalize_data_size(); |
6daf5215 ILT |
4898 | if (this->dynamic_symbol_ == NULL) |
4899 | return; | |
f0ba79e2 ILT |
4900 | off_t data_size = odyn->data_size(); |
4901 | const int size = parameters->target().get_size(); | |
4902 | if (size == 32) | |
4903 | symtab->get_sized_symbol<32>(this->dynamic_symbol_)->set_symsize(data_size); | |
4904 | else if (size == 64) | |
4905 | symtab->get_sized_symbol<64>(this->dynamic_symbol_)->set_symsize(data_size); | |
4906 | else | |
4907 | gold_unreachable(); | |
4908 | } | |
4909 | ||
dff16297 ILT |
4910 | // The mapping of input section name prefixes to output section names. |
4911 | // In some cases one prefix is itself a prefix of another prefix; in | |
4912 | // such a case the longer prefix must come first. These prefixes are | |
4913 | // based on the GNU linker default ELF linker script. | |
a2fb1b05 | 4914 | |
ead1e424 | 4915 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
1be75daa | 4916 | #define MAPPING_INIT_EXACT(f, t) { f, 0, t, sizeof(t) - 1 } |
dff16297 | 4917 | const Layout::Section_name_mapping Layout::section_name_mapping[] = |
a2fb1b05 | 4918 | { |
dff16297 | 4919 | MAPPING_INIT(".text.", ".text"), |
dff16297 | 4920 | MAPPING_INIT(".rodata.", ".rodata"), |
9b689de0 | 4921 | MAPPING_INIT(".data.rel.ro.local.", ".data.rel.ro.local"), |
1be75daa | 4922 | MAPPING_INIT_EXACT(".data.rel.ro.local", ".data.rel.ro.local"), |
9b689de0 | 4923 | MAPPING_INIT(".data.rel.ro.", ".data.rel.ro"), |
1be75daa | 4924 | MAPPING_INIT_EXACT(".data.rel.ro", ".data.rel.ro"), |
dff16297 ILT |
4925 | MAPPING_INIT(".data.", ".data"), |
4926 | MAPPING_INIT(".bss.", ".bss"), | |
4927 | MAPPING_INIT(".tdata.", ".tdata"), | |
4928 | MAPPING_INIT(".tbss.", ".tbss"), | |
4929 | MAPPING_INIT(".init_array.", ".init_array"), | |
4930 | MAPPING_INIT(".fini_array.", ".fini_array"), | |
4931 | MAPPING_INIT(".sdata.", ".sdata"), | |
4932 | MAPPING_INIT(".sbss.", ".sbss"), | |
4933 | // FIXME: In the GNU linker, .sbss2 and .sdata2 are handled | |
4934 | // differently depending on whether it is creating a shared library. | |
4935 | MAPPING_INIT(".sdata2.", ".sdata"), | |
4936 | MAPPING_INIT(".sbss2.", ".sbss"), | |
4937 | MAPPING_INIT(".lrodata.", ".lrodata"), | |
4938 | MAPPING_INIT(".ldata.", ".ldata"), | |
4939 | MAPPING_INIT(".lbss.", ".lbss"), | |
4940 | MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"), | |
4941 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"), | |
4942 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"), | |
4943 | MAPPING_INIT(".gnu.linkonce.t.", ".text"), | |
4944 | MAPPING_INIT(".gnu.linkonce.r.", ".rodata"), | |
4945 | MAPPING_INIT(".gnu.linkonce.d.", ".data"), | |
4946 | MAPPING_INIT(".gnu.linkonce.b.", ".bss"), | |
4947 | MAPPING_INIT(".gnu.linkonce.s.", ".sdata"), | |
4948 | MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"), | |
4949 | MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"), | |
4950 | MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"), | |
4951 | MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"), | |
4952 | MAPPING_INIT(".gnu.linkonce.td.", ".tdata"), | |
4953 | MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"), | |
4954 | MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"), | |
4955 | MAPPING_INIT(".gnu.linkonce.l.", ".ldata"), | |
4956 | MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"), | |
4a54abbb | 4957 | MAPPING_INIT(".ARM.extab", ".ARM.extab"), |
1dcd334d | 4958 | MAPPING_INIT(".gnu.linkonce.armextab.", ".ARM.extab"), |
4a54abbb | 4959 | MAPPING_INIT(".ARM.exidx", ".ARM.exidx"), |
1dcd334d | 4960 | MAPPING_INIT(".gnu.linkonce.armexidx.", ".ARM.exidx"), |
a2fb1b05 ILT |
4961 | }; |
4962 | #undef MAPPING_INIT | |
1be75daa | 4963 | #undef MAPPING_INIT_EXACT |
a2fb1b05 | 4964 | |
dff16297 ILT |
4965 | const int Layout::section_name_mapping_count = |
4966 | (sizeof(Layout::section_name_mapping) | |
4967 | / sizeof(Layout::section_name_mapping[0])); | |
a2fb1b05 | 4968 | |
ead1e424 ILT |
4969 | // Choose the output section name to use given an input section name. |
4970 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
4971 | // length of NAME. | |
4972 | ||
4973 | const char* | |
5393d741 ILT |
4974 | Layout::output_section_name(const Relobj* relobj, const char* name, |
4975 | size_t* plen) | |
ead1e424 | 4976 | { |
af4a8a83 ILT |
4977 | // gcc 4.3 generates the following sorts of section names when it |
4978 | // needs a section name specific to a function: | |
4979 | // .text.FN | |
4980 | // .rodata.FN | |
4981 | // .sdata2.FN | |
4982 | // .data.FN | |
4983 | // .data.rel.FN | |
4984 | // .data.rel.local.FN | |
4985 | // .data.rel.ro.FN | |
4986 | // .data.rel.ro.local.FN | |
4987 | // .sdata.FN | |
4988 | // .bss.FN | |
4989 | // .sbss.FN | |
4990 | // .tdata.FN | |
4991 | // .tbss.FN | |
4992 | ||
4993 | // The GNU linker maps all of those to the part before the .FN, | |
4994 | // except that .data.rel.local.FN is mapped to .data, and | |
4995 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
4996 | // beginning with .data.rel.ro.local are grouped together. | |
4997 | ||
4998 | // For an anonymous namespace, the string FN can contain a '.'. | |
4999 | ||
5000 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
5001 | // GNU linker maps to .rodata. | |
5002 | ||
dff16297 ILT |
5003 | // The .data.rel.ro sections are used with -z relro. The sections |
5004 | // are recognized by name. We use the same names that the GNU | |
5005 | // linker does for these sections. | |
af4a8a83 | 5006 | |
dff16297 ILT |
5007 | // It is hard to handle this in a principled way, so we don't even |
5008 | // try. We use a table of mappings. If the input section name is | |
5009 | // not found in the table, we simply use it as the output section | |
5010 | // name. | |
af4a8a83 | 5011 | |
dff16297 ILT |
5012 | const Section_name_mapping* psnm = section_name_mapping; |
5013 | for (int i = 0; i < section_name_mapping_count; ++i, ++psnm) | |
ead1e424 | 5014 | { |
1be75daa | 5015 | if (psnm->fromlen > 0) |
dff16297 | 5016 | { |
1be75daa CC |
5017 | if (strncmp(name, psnm->from, psnm->fromlen) == 0) |
5018 | { | |
5019 | *plen = psnm->tolen; | |
5020 | return psnm->to; | |
5021 | } | |
5022 | } | |
5023 | else | |
5024 | { | |
5025 | if (strcmp(name, psnm->from) == 0) | |
5026 | { | |
5027 | *plen = psnm->tolen; | |
5028 | return psnm->to; | |
5029 | } | |
dff16297 | 5030 | } |
ead1e424 ILT |
5031 | } |
5032 | ||
5393d741 ILT |
5033 | // As an additional complication, .ctors sections are output in |
5034 | // either .ctors or .init_array sections, and .dtors sections are | |
5035 | // output in either .dtors or .fini_array sections. | |
5036 | if (is_prefix_of(".ctors.", name) || is_prefix_of(".dtors.", name)) | |
5037 | { | |
5038 | if (parameters->options().ctors_in_init_array()) | |
5039 | { | |
5040 | *plen = 11; | |
5041 | return name[1] == 'c' ? ".init_array" : ".fini_array"; | |
5042 | } | |
5043 | else | |
5044 | { | |
5045 | *plen = 6; | |
5046 | return name[1] == 'c' ? ".ctors" : ".dtors"; | |
5047 | } | |
5048 | } | |
5049 | if (parameters->options().ctors_in_init_array() | |
5050 | && (strcmp(name, ".ctors") == 0 || strcmp(name, ".dtors") == 0)) | |
5051 | { | |
5052 | // To make .init_array/.fini_array work with gcc we must exclude | |
5053 | // .ctors and .dtors sections from the crtbegin and crtend | |
5054 | // files. | |
5055 | if (relobj == NULL | |
5056 | || (!Layout::match_file_name(relobj, "crtbegin") | |
5057 | && !Layout::match_file_name(relobj, "crtend"))) | |
5058 | { | |
5059 | *plen = 11; | |
5060 | return name[1] == 'c' ? ".init_array" : ".fini_array"; | |
5061 | } | |
5062 | } | |
5063 | ||
ead1e424 ILT |
5064 | return name; |
5065 | } | |
5066 | ||
5393d741 ILT |
5067 | // Return true if RELOBJ is an input file whose base name matches |
5068 | // FILE_NAME. The base name must have an extension of ".o", and must | |
5069 | // be exactly FILE_NAME.o or FILE_NAME, one character, ".o". This is | |
5070 | // to match crtbegin.o as well as crtbeginS.o without getting confused | |
5071 | // by other possibilities. Overall matching the file name this way is | |
5072 | // a dreadful hack, but the GNU linker does it in order to better | |
5073 | // support gcc, and we need to be compatible. | |
5074 | ||
5075 | bool | |
5076 | Layout::match_file_name(const Relobj* relobj, const char* match) | |
5077 | { | |
5078 | const std::string& file_name(relobj->name()); | |
5079 | const char* base_name = lbasename(file_name.c_str()); | |
5080 | size_t match_len = strlen(match); | |
5081 | if (strncmp(base_name, match, match_len) != 0) | |
5082 | return false; | |
5083 | size_t base_len = strlen(base_name); | |
5084 | if (base_len != match_len + 2 && base_len != match_len + 3) | |
5085 | return false; | |
5086 | return memcmp(base_name + base_len - 2, ".o", 2) == 0; | |
5087 | } | |
5088 | ||
8a4c0b0d ILT |
5089 | // Check if a comdat group or .gnu.linkonce section with the given |
5090 | // NAME is selected for the link. If there is already a section, | |
1ef4d87f ILT |
5091 | // *KEPT_SECTION is set to point to the existing section and the |
5092 | // function returns false. Otherwise, OBJECT, SHNDX, IS_COMDAT, and | |
5093 | // IS_GROUP_NAME are recorded for this NAME in the layout object, | |
5094 | // *KEPT_SECTION is set to the internal copy and the function returns | |
5095 | // true. | |
a2fb1b05 ILT |
5096 | |
5097 | bool | |
e55bde5e | 5098 | Layout::find_or_add_kept_section(const std::string& name, |
1ef4d87f ILT |
5099 | Relobj* object, |
5100 | unsigned int shndx, | |
5101 | bool is_comdat, | |
5102 | bool is_group_name, | |
2e702c99 | 5103 | Kept_section** kept_section) |
a2fb1b05 | 5104 | { |
e55bde5e ILT |
5105 | // It's normal to see a couple of entries here, for the x86 thunk |
5106 | // sections. If we see more than a few, we're linking a C++ | |
5107 | // program, and we resize to get more space to minimize rehashing. | |
5108 | if (this->signatures_.size() > 4 | |
5109 | && !this->resized_signatures_) | |
5110 | { | |
5111 | reserve_unordered_map(&this->signatures_, | |
5112 | this->number_of_input_files_ * 64); | |
5113 | this->resized_signatures_ = true; | |
5114 | } | |
5115 | ||
1ef4d87f ILT |
5116 | Kept_section candidate; |
5117 | std::pair<Signatures::iterator, bool> ins = | |
5118 | this->signatures_.insert(std::make_pair(name, candidate)); | |
a2fb1b05 | 5119 | |
1ef4d87f | 5120 | if (kept_section != NULL) |
8a4c0b0d | 5121 | *kept_section = &ins.first->second; |
a2fb1b05 ILT |
5122 | if (ins.second) |
5123 | { | |
5124 | // This is the first time we've seen this signature. | |
1ef4d87f ILT |
5125 | ins.first->second.set_object(object); |
5126 | ins.first->second.set_shndx(shndx); | |
5127 | if (is_comdat) | |
5128 | ins.first->second.set_is_comdat(); | |
5129 | if (is_group_name) | |
5130 | ins.first->second.set_is_group_name(); | |
a2fb1b05 ILT |
5131 | return true; |
5132 | } | |
5133 | ||
1ef4d87f ILT |
5134 | // We have already seen this signature. |
5135 | ||
5136 | if (ins.first->second.is_group_name()) | |
a2fb1b05 ILT |
5137 | { |
5138 | // We've already seen a real section group with this signature. | |
1ef4d87f ILT |
5139 | // If the kept group is from a plugin object, and we're in the |
5140 | // replacement phase, accept the new one as a replacement. | |
5141 | if (ins.first->second.object() == NULL | |
2e702c99 RM |
5142 | && parameters->options().plugins()->in_replacement_phase()) |
5143 | { | |
1ef4d87f ILT |
5144 | ins.first->second.set_object(object); |
5145 | ins.first->second.set_shndx(shndx); | |
2e702c99 RM |
5146 | return true; |
5147 | } | |
a2fb1b05 ILT |
5148 | return false; |
5149 | } | |
1ef4d87f | 5150 | else if (is_group_name) |
a2fb1b05 ILT |
5151 | { |
5152 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 5153 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 | 5154 | // a section group, and don't include this section group. |
1ef4d87f | 5155 | ins.first->second.set_is_group_name(); |
a2fb1b05 ILT |
5156 | return false; |
5157 | } | |
5158 | else | |
5159 | { | |
5160 | // We've already seen a linkonce section and this is a linkonce | |
5161 | // section. These don't block each other--this may be the same | |
5162 | // symbol name with different section types. | |
5163 | return true; | |
5164 | } | |
5165 | } | |
5166 | ||
a445fddf ILT |
5167 | // Store the allocated sections into the section list. |
5168 | ||
5169 | void | |
2ea97941 | 5170 | Layout::get_allocated_sections(Section_list* section_list) const |
a445fddf ILT |
5171 | { |
5172 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5173 | p != this->section_list_.end(); | |
5174 | ++p) | |
5175 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) | |
2ea97941 | 5176 | section_list->push_back(*p); |
a445fddf ILT |
5177 | } |
5178 | ||
ec661b9d AM |
5179 | // Store the executable sections into the section list. |
5180 | ||
5181 | void | |
5182 | Layout::get_executable_sections(Section_list* section_list) const | |
5183 | { | |
5184 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5185 | p != this->section_list_.end(); | |
5186 | ++p) | |
5187 | if (((*p)->flags() & (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) | |
5188 | == (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) | |
5189 | section_list->push_back(*p); | |
5190 | } | |
5191 | ||
a445fddf ILT |
5192 | // Create an output segment. |
5193 | ||
5194 | Output_segment* | |
5195 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
5196 | { | |
8851ecca | 5197 | gold_assert(!parameters->options().relocatable()); |
a445fddf ILT |
5198 | Output_segment* oseg = new Output_segment(type, flags); |
5199 | this->segment_list_.push_back(oseg); | |
2d924fd9 ILT |
5200 | |
5201 | if (type == elfcpp::PT_TLS) | |
5202 | this->tls_segment_ = oseg; | |
5203 | else if (type == elfcpp::PT_GNU_RELRO) | |
5204 | this->relro_segment_ = oseg; | |
10b4f102 ILT |
5205 | else if (type == elfcpp::PT_INTERP) |
5206 | this->interp_segment_ = oseg; | |
2d924fd9 | 5207 | |
a445fddf ILT |
5208 | return oseg; |
5209 | } | |
5210 | ||
bec5b579 CC |
5211 | // Return the file offset of the normal symbol table. |
5212 | ||
5213 | off_t | |
5214 | Layout::symtab_section_offset() const | |
5215 | { | |
5216 | if (this->symtab_section_ != NULL) | |
5217 | return this->symtab_section_->offset(); | |
5218 | return 0; | |
5219 | } | |
5220 | ||
886f533a ILT |
5221 | // Return the section index of the normal symbol table. It may have |
5222 | // been stripped by the -s/--strip-all option. | |
5223 | ||
5224 | unsigned int | |
5225 | Layout::symtab_section_shndx() const | |
5226 | { | |
5227 | if (this->symtab_section_ != NULL) | |
5228 | return this->symtab_section_->out_shndx(); | |
5229 | return 0; | |
5230 | } | |
5231 | ||
730cdc88 ILT |
5232 | // Write out the Output_sections. Most won't have anything to write, |
5233 | // since most of the data will come from input sections which are | |
5234 | // handled elsewhere. But some Output_sections do have Output_data. | |
5235 | ||
5236 | void | |
5237 | Layout::write_output_sections(Output_file* of) const | |
5238 | { | |
5239 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5240 | p != this->section_list_.end(); | |
5241 | ++p) | |
5242 | { | |
5243 | if (!(*p)->after_input_sections()) | |
5244 | (*p)->write(of); | |
5245 | } | |
5246 | } | |
5247 | ||
61ba1cf9 ILT |
5248 | // Write out data not associated with a section or the symbol table. |
5249 | ||
5250 | void | |
9025d29d | 5251 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 5252 | { |
8851ecca | 5253 | if (!parameters->options().strip_all()) |
a3ad94ed | 5254 | { |
2ea97941 | 5255 | const Output_section* symtab_section = this->symtab_section_; |
9e2dcb77 ILT |
5256 | for (Section_list::const_iterator p = this->section_list_.begin(); |
5257 | p != this->section_list_.end(); | |
5258 | ++p) | |
a3ad94ed | 5259 | { |
9e2dcb77 ILT |
5260 | if ((*p)->needs_symtab_index()) |
5261 | { | |
2ea97941 | 5262 | gold_assert(symtab_section != NULL); |
9e2dcb77 ILT |
5263 | unsigned int index = (*p)->symtab_index(); |
5264 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
5265 | off_t off = (symtab_section->offset() |
5266 | + index * symtab_section->entsize()); | |
d491d34e | 5267 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
9e2dcb77 | 5268 | } |
a3ad94ed ILT |
5269 | } |
5270 | } | |
5271 | ||
2ea97941 | 5272 | const Output_section* dynsym_section = this->dynsym_section_; |
a3ad94ed ILT |
5273 | for (Section_list::const_iterator p = this->section_list_.begin(); |
5274 | p != this->section_list_.end(); | |
5275 | ++p) | |
5276 | { | |
5277 | if ((*p)->needs_dynsym_index()) | |
5278 | { | |
2ea97941 | 5279 | gold_assert(dynsym_section != NULL); |
a3ad94ed ILT |
5280 | unsigned int index = (*p)->dynsym_index(); |
5281 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
5282 | off_t off = (dynsym_section->offset() |
5283 | + index * dynsym_section->entsize()); | |
d491d34e | 5284 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
a3ad94ed ILT |
5285 | } |
5286 | } | |
5287 | ||
a3ad94ed | 5288 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
5289 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
5290 | p != this->special_output_list_.end(); | |
5291 | ++p) | |
5292 | (*p)->write(of); | |
eb426534 RM |
5293 | |
5294 | // Write out the Output_data which are not in an Output_section | |
5295 | // and are regenerated in each iteration of relaxation. | |
5296 | for (Data_list::const_iterator p = this->relax_output_list_.begin(); | |
5297 | p != this->relax_output_list_.end(); | |
5298 | ++p) | |
5299 | (*p)->write(of); | |
61ba1cf9 ILT |
5300 | } |
5301 | ||
730cdc88 ILT |
5302 | // Write out the Output_sections which can only be written after the |
5303 | // input sections are complete. | |
5304 | ||
5305 | void | |
27bc2bce | 5306 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 5307 | { |
27bc2bce | 5308 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
5309 | // file size. Note we finalize the .shstrab last, to allow the |
5310 | // after_input_section sections to modify their section-names before | |
5311 | // writing. | |
17a1d0a9 | 5312 | if (this->any_postprocessing_sections_) |
27bc2bce | 5313 | { |
17a1d0a9 ILT |
5314 | off_t off = this->output_file_size_; |
5315 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); | |
8a4c0b0d | 5316 | |
17a1d0a9 ILT |
5317 | // Now that we've finalized the names, we can finalize the shstrab. |
5318 | off = | |
5319 | this->set_section_offsets(off, | |
5320 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
5321 | ||
5322 | if (off > this->output_file_size_) | |
5323 | { | |
5324 | of->resize(off); | |
5325 | this->output_file_size_ = off; | |
5326 | } | |
27bc2bce ILT |
5327 | } |
5328 | ||
730cdc88 ILT |
5329 | for (Section_list::const_iterator p = this->section_list_.begin(); |
5330 | p != this->section_list_.end(); | |
5331 | ++p) | |
5332 | { | |
5333 | if ((*p)->after_input_sections()) | |
5334 | (*p)->write(of); | |
5335 | } | |
27bc2bce | 5336 | |
27bc2bce | 5337 | this->section_headers_->write(of); |
730cdc88 ILT |
5338 | } |
5339 | ||
e7c5ea40 CC |
5340 | // Build IDs can be computed as a "flat" sha1 or md5 of a string of bytes, |
5341 | // or as a "tree" where each chunk of the string is hashed and then those | |
5342 | // hashes are put into a (much smaller) string which is hashed with sha1. | |
5343 | // We compute a checksum over the entire file because that is simplest. | |
5344 | ||
5345 | Task_token* | |
5346 | Layout::queue_build_id_tasks(Workqueue* workqueue, Task_token* build_id_blocker, | |
bbc5ae17 | 5347 | Output_file* of) |
e7c5ea40 CC |
5348 | { |
5349 | const size_t filesize = (this->output_file_size() <= 0 ? 0 | |
bbc5ae17 | 5350 | : static_cast<size_t>(this->output_file_size())); |
e7c5ea40 CC |
5351 | if (this->build_id_note_ != NULL |
5352 | && strcmp(parameters->options().build_id(), "tree") == 0 | |
5353 | && parameters->options().build_id_chunk_size_for_treehash() > 0 | |
5354 | && filesize > 0 | |
5355 | && (filesize >= | |
bbc5ae17 | 5356 | parameters->options().build_id_min_file_size_for_treehash())) |
e7c5ea40 CC |
5357 | { |
5358 | static const size_t MD5_OUTPUT_SIZE_IN_BYTES = 16; | |
5359 | const size_t chunk_size = | |
bbc5ae17 | 5360 | parameters->options().build_id_chunk_size_for_treehash(); |
e7c5ea40 CC |
5361 | const size_t num_hashes = ((filesize - 1) / chunk_size) + 1; |
5362 | Task_token* post_hash_tasks_blocker = new Task_token(true); | |
5363 | post_hash_tasks_blocker->add_blockers(num_hashes); | |
5364 | this->size_of_array_of_hashes_ = num_hashes * MD5_OUTPUT_SIZE_IN_BYTES; | |
5365 | const unsigned char* src = of->get_input_view(0, filesize); | |
5366 | this->input_view_ = src; | |
5367 | unsigned char *dst = new unsigned char[this->size_of_array_of_hashes_]; | |
5368 | this->array_of_hashes_ = dst; | |
5369 | for (size_t i = 0, src_offset = 0; i < num_hashes; | |
bbc5ae17 RM |
5370 | i++, dst += MD5_OUTPUT_SIZE_IN_BYTES, src_offset += chunk_size) |
5371 | { | |
5372 | size_t size = std::min(chunk_size, filesize - src_offset); | |
5373 | workqueue->queue(new Hash_task(src + src_offset, | |
5374 | size, | |
5375 | dst, | |
5376 | build_id_blocker, | |
5377 | post_hash_tasks_blocker)); | |
5378 | } | |
e7c5ea40 CC |
5379 | return post_hash_tasks_blocker; |
5380 | } | |
5381 | return build_id_blocker; | |
5382 | } | |
5383 | ||
5384 | // If a tree-style build ID was requested, the parallel part of that computation | |
5385 | // is already done, and the final hash-of-hashes is computed here. For other | |
5386 | // types of build IDs, all the work is done here. | |
8ed814a9 ILT |
5387 | |
5388 | void | |
5389 | Layout::write_build_id(Output_file* of) const | |
5390 | { | |
5391 | if (this->build_id_note_ == NULL) | |
5392 | return; | |
5393 | ||
8ed814a9 | 5394 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), |
bbc5ae17 | 5395 | this->build_id_note_->data_size()); |
8ed814a9 | 5396 | |
e7c5ea40 | 5397 | if (this->array_of_hashes_ == NULL) |
8ed814a9 | 5398 | { |
e7c5ea40 CC |
5399 | const size_t output_file_size = this->output_file_size(); |
5400 | const unsigned char* iv = of->get_input_view(0, output_file_size); | |
5401 | const char* style = parameters->options().build_id(); | |
5402 | ||
5403 | // If we get here with style == "tree" then the output must be | |
5404 | // too small for chunking, and we use SHA-1 in that case. | |
5405 | if ((strcmp(style, "sha1") == 0) || (strcmp(style, "tree") == 0)) | |
bbc5ae17 | 5406 | sha1_buffer(reinterpret_cast<const char*>(iv), output_file_size, ov); |
e7c5ea40 | 5407 | else if (strcmp(style, "md5") == 0) |
bbc5ae17 | 5408 | md5_buffer(reinterpret_cast<const char*>(iv), output_file_size, ov); |
e7c5ea40 | 5409 | else |
bbc5ae17 | 5410 | gold_unreachable(); |
e7c5ea40 CC |
5411 | |
5412 | of->free_input_view(0, output_file_size, iv); | |
8ed814a9 | 5413 | } |
e7c5ea40 | 5414 | else |
8ed814a9 | 5415 | { |
e7c5ea40 CC |
5416 | // Non-overlapping substrings of the output file have been hashed. |
5417 | // Compute SHA-1 hash of the hashes. | |
5418 | sha1_buffer(reinterpret_cast<const char*>(this->array_of_hashes_), | |
bbc5ae17 | 5419 | this->size_of_array_of_hashes_, ov); |
e7c5ea40 CC |
5420 | delete[] this->array_of_hashes_; |
5421 | of->free_input_view(0, this->output_file_size(), this->input_view_); | |
8ed814a9 | 5422 | } |
8ed814a9 ILT |
5423 | |
5424 | of->write_output_view(this->build_id_note_->offset(), | |
5425 | this->build_id_note_->data_size(), | |
5426 | ov); | |
8ed814a9 ILT |
5427 | } |
5428 | ||
516cb3d0 ILT |
5429 | // Write out a binary file. This is called after the link is |
5430 | // complete. IN is the temporary output file we used to generate the | |
5431 | // ELF code. We simply walk through the segments, read them from | |
5432 | // their file offset in IN, and write them to their load address in | |
5433 | // the output file. FIXME: with a bit more work, we could support | |
5434 | // S-records and/or Intel hex format here. | |
5435 | ||
5436 | void | |
5437 | Layout::write_binary(Output_file* in) const | |
5438 | { | |
e55bde5e | 5439 | gold_assert(parameters->options().oformat_enum() |
bc644c6c | 5440 | == General_options::OBJECT_FORMAT_BINARY); |
516cb3d0 ILT |
5441 | |
5442 | // Get the size of the binary file. | |
5443 | uint64_t max_load_address = 0; | |
5444 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
5445 | p != this->segment_list_.end(); | |
5446 | ++p) | |
5447 | { | |
5448 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
5449 | { | |
5450 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); | |
5451 | if (max_paddr > max_load_address) | |
5452 | max_load_address = max_paddr; | |
5453 | } | |
5454 | } | |
5455 | ||
8851ecca | 5456 | Output_file out(parameters->options().output_file_name()); |
516cb3d0 ILT |
5457 | out.open(max_load_address); |
5458 | ||
5459 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
5460 | p != this->segment_list_.end(); | |
5461 | ++p) | |
5462 | { | |
5463 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
5464 | { | |
5465 | const unsigned char* vin = in->get_input_view((*p)->offset(), | |
5466 | (*p)->filesz()); | |
5467 | unsigned char* vout = out.get_output_view((*p)->paddr(), | |
5468 | (*p)->filesz()); | |
5469 | memcpy(vout, vin, (*p)->filesz()); | |
5470 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); | |
5471 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); | |
5472 | } | |
5473 | } | |
5474 | ||
5475 | out.close(); | |
5476 | } | |
5477 | ||
7d9e3d98 ILT |
5478 | // Print the output sections to the map file. |
5479 | ||
5480 | void | |
5481 | Layout::print_to_mapfile(Mapfile* mapfile) const | |
5482 | { | |
5483 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
5484 | p != this->segment_list_.end(); | |
5485 | ++p) | |
5486 | (*p)->print_sections_to_mapfile(mapfile); | |
5487 | } | |
5488 | ||
ad8f37d1 ILT |
5489 | // Print statistical information to stderr. This is used for --stats. |
5490 | ||
5491 | void | |
5492 | Layout::print_stats() const | |
5493 | { | |
5494 | this->namepool_.print_stats("section name pool"); | |
5495 | this->sympool_.print_stats("output symbol name pool"); | |
5496 | this->dynpool_.print_stats("dynamic name pool"); | |
38c5e8b4 ILT |
5497 | |
5498 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5499 | p != this->section_list_.end(); | |
5500 | ++p) | |
5501 | (*p)->print_merge_stats(); | |
ad8f37d1 ILT |
5502 | } |
5503 | ||
730cdc88 ILT |
5504 | // Write_sections_task methods. |
5505 | ||
5506 | // We can always run this task. | |
5507 | ||
17a1d0a9 ILT |
5508 | Task_token* |
5509 | Write_sections_task::is_runnable() | |
730cdc88 | 5510 | { |
17a1d0a9 | 5511 | return NULL; |
730cdc88 ILT |
5512 | } |
5513 | ||
5514 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
5515 | // when finished. | |
5516 | ||
17a1d0a9 ILT |
5517 | void |
5518 | Write_sections_task::locks(Task_locker* tl) | |
730cdc88 | 5519 | { |
17a1d0a9 ILT |
5520 | tl->add(this, this->output_sections_blocker_); |
5521 | tl->add(this, this->final_blocker_); | |
730cdc88 ILT |
5522 | } |
5523 | ||
5524 | // Run the task--write out the data. | |
5525 | ||
5526 | void | |
5527 | Write_sections_task::run(Workqueue*) | |
5528 | { | |
5529 | this->layout_->write_output_sections(this->of_); | |
5530 | } | |
5531 | ||
61ba1cf9 ILT |
5532 | // Write_data_task methods. |
5533 | ||
5534 | // We can always run this task. | |
5535 | ||
17a1d0a9 ILT |
5536 | Task_token* |
5537 | Write_data_task::is_runnable() | |
61ba1cf9 | 5538 | { |
17a1d0a9 | 5539 | return NULL; |
61ba1cf9 ILT |
5540 | } |
5541 | ||
5542 | // We need to unlock FINAL_BLOCKER when finished. | |
5543 | ||
17a1d0a9 ILT |
5544 | void |
5545 | Write_data_task::locks(Task_locker* tl) | |
61ba1cf9 | 5546 | { |
17a1d0a9 | 5547 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
5548 | } |
5549 | ||
5550 | // Run the task--write out the data. | |
5551 | ||
5552 | void | |
5553 | Write_data_task::run(Workqueue*) | |
5554 | { | |
9025d29d | 5555 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
5556 | } |
5557 | ||
5558 | // Write_symbols_task methods. | |
5559 | ||
5560 | // We can always run this task. | |
5561 | ||
17a1d0a9 ILT |
5562 | Task_token* |
5563 | Write_symbols_task::is_runnable() | |
61ba1cf9 | 5564 | { |
17a1d0a9 | 5565 | return NULL; |
61ba1cf9 ILT |
5566 | } |
5567 | ||
5568 | // We need to unlock FINAL_BLOCKER when finished. | |
5569 | ||
17a1d0a9 ILT |
5570 | void |
5571 | Write_symbols_task::locks(Task_locker* tl) | |
61ba1cf9 | 5572 | { |
17a1d0a9 | 5573 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
5574 | } |
5575 | ||
5576 | // Run the task--write out the symbols. | |
5577 | ||
5578 | void | |
5579 | Write_symbols_task::run(Workqueue*) | |
5580 | { | |
fd9d194f ILT |
5581 | this->symtab_->write_globals(this->sympool_, this->dynpool_, |
5582 | this->layout_->symtab_xindex(), | |
d491d34e | 5583 | this->layout_->dynsym_xindex(), this->of_); |
61ba1cf9 ILT |
5584 | } |
5585 | ||
730cdc88 ILT |
5586 | // Write_after_input_sections_task methods. |
5587 | ||
5588 | // We can only run this task after the input sections have completed. | |
5589 | ||
17a1d0a9 ILT |
5590 | Task_token* |
5591 | Write_after_input_sections_task::is_runnable() | |
730cdc88 ILT |
5592 | { |
5593 | if (this->input_sections_blocker_->is_blocked()) | |
17a1d0a9 ILT |
5594 | return this->input_sections_blocker_; |
5595 | return NULL; | |
730cdc88 ILT |
5596 | } |
5597 | ||
5598 | // We need to unlock FINAL_BLOCKER when finished. | |
5599 | ||
17a1d0a9 ILT |
5600 | void |
5601 | Write_after_input_sections_task::locks(Task_locker* tl) | |
730cdc88 | 5602 | { |
17a1d0a9 | 5603 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
5604 | } |
5605 | ||
5606 | // Run the task. | |
5607 | ||
5608 | void | |
5609 | Write_after_input_sections_task::run(Workqueue*) | |
5610 | { | |
5611 | this->layout_->write_sections_after_input_sections(this->of_); | |
5612 | } | |
5613 | ||
92e059d8 | 5614 | // Close_task_runner methods. |
61ba1cf9 | 5615 | |
e7c5ea40 CC |
5616 | // Finish up the build ID computation, if necessary, and write a binary file, |
5617 | // if necessary. Then close the output file. | |
61ba1cf9 ILT |
5618 | |
5619 | void | |
17a1d0a9 | 5620 | Close_task_runner::run(Workqueue*, const Task*) |
61ba1cf9 | 5621 | { |
e7c5ea40 CC |
5622 | // At this point the multi-threaded part of the build ID computation, |
5623 | // if any, is done. See queue_build_id_tasks(). | |
8ed814a9 ILT |
5624 | this->layout_->write_build_id(this->of_); |
5625 | ||
516cb3d0 | 5626 | // If we've been asked to create a binary file, we do so here. |
7cc619c3 | 5627 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
5628 | this->layout_->write_binary(this->of_); |
5629 | ||
61ba1cf9 ILT |
5630 | this->of_->close(); |
5631 | } | |
5632 | ||
a2fb1b05 ILT |
5633 | // Instantiate the templates we need. We could use the configure |
5634 | // script to restrict this to only the ones for implemented targets. | |
5635 | ||
193a53d9 | 5636 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 | 5637 | template |
cdc29364 CC |
5638 | Output_section* |
5639 | Layout::init_fixed_output_section<32, false>( | |
5640 | const char* name, | |
5641 | elfcpp::Shdr<32, false>& shdr); | |
5642 | #endif | |
5643 | ||
5644 | #ifdef HAVE_TARGET_32_BIG | |
5645 | template | |
5646 | Output_section* | |
5647 | Layout::init_fixed_output_section<32, true>( | |
5648 | const char* name, | |
5649 | elfcpp::Shdr<32, true>& shdr); | |
5650 | #endif | |
5651 | ||
5652 | #ifdef HAVE_TARGET_64_LITTLE | |
5653 | template | |
5654 | Output_section* | |
5655 | Layout::init_fixed_output_section<64, false>( | |
5656 | const char* name, | |
5657 | elfcpp::Shdr<64, false>& shdr); | |
5658 | #endif | |
5659 | ||
5660 | #ifdef HAVE_TARGET_64_BIG | |
5661 | template | |
5662 | Output_section* | |
5663 | Layout::init_fixed_output_section<64, true>( | |
5664 | const char* name, | |
5665 | elfcpp::Shdr<64, true>& shdr); | |
5666 | #endif | |
5667 | ||
5668 | #ifdef HAVE_TARGET_32_LITTLE | |
5669 | template | |
a2fb1b05 | 5670 | Output_section* |
6fa2a40b CC |
5671 | Layout::layout<32, false>(Sized_relobj_file<32, false>* object, |
5672 | unsigned int shndx, | |
730cdc88 ILT |
5673 | const char* name, |
5674 | const elfcpp::Shdr<32, false>& shdr, | |
5675 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5676 | #endif |
a2fb1b05 | 5677 | |
193a53d9 | 5678 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
5679 | template |
5680 | Output_section* | |
6fa2a40b CC |
5681 | Layout::layout<32, true>(Sized_relobj_file<32, true>* object, |
5682 | unsigned int shndx, | |
730cdc88 ILT |
5683 | const char* name, |
5684 | const elfcpp::Shdr<32, true>& shdr, | |
5685 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5686 | #endif |
a2fb1b05 | 5687 | |
193a53d9 | 5688 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
5689 | template |
5690 | Output_section* | |
6fa2a40b CC |
5691 | Layout::layout<64, false>(Sized_relobj_file<64, false>* object, |
5692 | unsigned int shndx, | |
730cdc88 ILT |
5693 | const char* name, |
5694 | const elfcpp::Shdr<64, false>& shdr, | |
5695 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5696 | #endif |
a2fb1b05 | 5697 | |
193a53d9 | 5698 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
5699 | template |
5700 | Output_section* | |
6fa2a40b CC |
5701 | Layout::layout<64, true>(Sized_relobj_file<64, true>* object, |
5702 | unsigned int shndx, | |
730cdc88 ILT |
5703 | const char* name, |
5704 | const elfcpp::Shdr<64, true>& shdr, | |
5705 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5706 | #endif |
a2fb1b05 | 5707 | |
6a74a719 ILT |
5708 | #ifdef HAVE_TARGET_32_LITTLE |
5709 | template | |
5710 | Output_section* | |
6fa2a40b | 5711 | Layout::layout_reloc<32, false>(Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
5712 | unsigned int reloc_shndx, |
5713 | const elfcpp::Shdr<32, false>& shdr, | |
5714 | Output_section* data_section, | |
5715 | Relocatable_relocs* rr); | |
5716 | #endif | |
5717 | ||
5718 | #ifdef HAVE_TARGET_32_BIG | |
5719 | template | |
5720 | Output_section* | |
6fa2a40b | 5721 | Layout::layout_reloc<32, true>(Sized_relobj_file<32, true>* object, |
6a74a719 ILT |
5722 | unsigned int reloc_shndx, |
5723 | const elfcpp::Shdr<32, true>& shdr, | |
5724 | Output_section* data_section, | |
5725 | Relocatable_relocs* rr); | |
5726 | #endif | |
5727 | ||
5728 | #ifdef HAVE_TARGET_64_LITTLE | |
5729 | template | |
5730 | Output_section* | |
6fa2a40b | 5731 | Layout::layout_reloc<64, false>(Sized_relobj_file<64, false>* object, |
6a74a719 ILT |
5732 | unsigned int reloc_shndx, |
5733 | const elfcpp::Shdr<64, false>& shdr, | |
5734 | Output_section* data_section, | |
5735 | Relocatable_relocs* rr); | |
5736 | #endif | |
5737 | ||
5738 | #ifdef HAVE_TARGET_64_BIG | |
5739 | template | |
5740 | Output_section* | |
6fa2a40b | 5741 | Layout::layout_reloc<64, true>(Sized_relobj_file<64, true>* object, |
6a74a719 ILT |
5742 | unsigned int reloc_shndx, |
5743 | const elfcpp::Shdr<64, true>& shdr, | |
5744 | Output_section* data_section, | |
5745 | Relocatable_relocs* rr); | |
5746 | #endif | |
5747 | ||
5748 | #ifdef HAVE_TARGET_32_LITTLE | |
5749 | template | |
5750 | void | |
5751 | Layout::layout_group<32, false>(Symbol_table* symtab, | |
6fa2a40b | 5752 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
5753 | unsigned int, |
5754 | const char* group_section_name, | |
5755 | const char* signature, | |
5756 | const elfcpp::Shdr<32, false>& shdr, | |
8825ac63 ILT |
5757 | elfcpp::Elf_Word flags, |
5758 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5759 | #endif |
5760 | ||
5761 | #ifdef HAVE_TARGET_32_BIG | |
5762 | template | |
5763 | void | |
5764 | Layout::layout_group<32, true>(Symbol_table* symtab, | |
6fa2a40b | 5765 | Sized_relobj_file<32, true>* object, |
6a74a719 ILT |
5766 | unsigned int, |
5767 | const char* group_section_name, | |
5768 | const char* signature, | |
5769 | const elfcpp::Shdr<32, true>& shdr, | |
8825ac63 ILT |
5770 | elfcpp::Elf_Word flags, |
5771 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5772 | #endif |
5773 | ||
5774 | #ifdef HAVE_TARGET_64_LITTLE | |
5775 | template | |
5776 | void | |
5777 | Layout::layout_group<64, false>(Symbol_table* symtab, | |
6fa2a40b | 5778 | Sized_relobj_file<64, false>* object, |
6a74a719 ILT |
5779 | unsigned int, |
5780 | const char* group_section_name, | |
5781 | const char* signature, | |
5782 | const elfcpp::Shdr<64, false>& shdr, | |
8825ac63 ILT |
5783 | elfcpp::Elf_Word flags, |
5784 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5785 | #endif |
5786 | ||
5787 | #ifdef HAVE_TARGET_64_BIG | |
5788 | template | |
5789 | void | |
5790 | Layout::layout_group<64, true>(Symbol_table* symtab, | |
6fa2a40b | 5791 | Sized_relobj_file<64, true>* object, |
6a74a719 ILT |
5792 | unsigned int, |
5793 | const char* group_section_name, | |
5794 | const char* signature, | |
5795 | const elfcpp::Shdr<64, true>& shdr, | |
8825ac63 ILT |
5796 | elfcpp::Elf_Word flags, |
5797 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5798 | #endif |
5799 | ||
730cdc88 ILT |
5800 | #ifdef HAVE_TARGET_32_LITTLE |
5801 | template | |
5802 | Output_section* | |
6fa2a40b | 5803 | Layout::layout_eh_frame<32, false>(Sized_relobj_file<32, false>* object, |
730cdc88 ILT |
5804 | const unsigned char* symbols, |
5805 | off_t symbols_size, | |
5806 | const unsigned char* symbol_names, | |
5807 | off_t symbol_names_size, | |
5808 | unsigned int shndx, | |
5809 | const elfcpp::Shdr<32, false>& shdr, | |
5810 | unsigned int reloc_shndx, | |
5811 | unsigned int reloc_type, | |
5812 | off_t* off); | |
5813 | #endif | |
5814 | ||
5815 | #ifdef HAVE_TARGET_32_BIG | |
5816 | template | |
5817 | Output_section* | |
6fa2a40b CC |
5818 | Layout::layout_eh_frame<32, true>(Sized_relobj_file<32, true>* object, |
5819 | const unsigned char* symbols, | |
5820 | off_t symbols_size, | |
730cdc88 ILT |
5821 | const unsigned char* symbol_names, |
5822 | off_t symbol_names_size, | |
5823 | unsigned int shndx, | |
5824 | const elfcpp::Shdr<32, true>& shdr, | |
5825 | unsigned int reloc_shndx, | |
5826 | unsigned int reloc_type, | |
5827 | off_t* off); | |
5828 | #endif | |
5829 | ||
5830 | #ifdef HAVE_TARGET_64_LITTLE | |
5831 | template | |
5832 | Output_section* | |
6fa2a40b | 5833 | Layout::layout_eh_frame<64, false>(Sized_relobj_file<64, false>* object, |
730cdc88 ILT |
5834 | const unsigned char* symbols, |
5835 | off_t symbols_size, | |
5836 | const unsigned char* symbol_names, | |
5837 | off_t symbol_names_size, | |
5838 | unsigned int shndx, | |
5839 | const elfcpp::Shdr<64, false>& shdr, | |
5840 | unsigned int reloc_shndx, | |
5841 | unsigned int reloc_type, | |
5842 | off_t* off); | |
5843 | #endif | |
5844 | ||
5845 | #ifdef HAVE_TARGET_64_BIG | |
5846 | template | |
5847 | Output_section* | |
6fa2a40b CC |
5848 | Layout::layout_eh_frame<64, true>(Sized_relobj_file<64, true>* object, |
5849 | const unsigned char* symbols, | |
5850 | off_t symbols_size, | |
730cdc88 ILT |
5851 | const unsigned char* symbol_names, |
5852 | off_t symbol_names_size, | |
5853 | unsigned int shndx, | |
5854 | const elfcpp::Shdr<64, true>& shdr, | |
5855 | unsigned int reloc_shndx, | |
5856 | unsigned int reloc_type, | |
5857 | off_t* off); | |
5858 | #endif | |
a2fb1b05 | 5859 | |
c1027032 CC |
5860 | #ifdef HAVE_TARGET_32_LITTLE |
5861 | template | |
5862 | void | |
5863 | Layout::add_to_gdb_index(bool is_type_unit, | |
5864 | Sized_relobj<32, false>* object, | |
5865 | const unsigned char* symbols, | |
5866 | off_t symbols_size, | |
5867 | unsigned int shndx, | |
5868 | unsigned int reloc_shndx, | |
5869 | unsigned int reloc_type); | |
5870 | #endif | |
5871 | ||
5872 | #ifdef HAVE_TARGET_32_BIG | |
5873 | template | |
5874 | void | |
5875 | Layout::add_to_gdb_index(bool is_type_unit, | |
5876 | Sized_relobj<32, true>* object, | |
5877 | const unsigned char* symbols, | |
5878 | off_t symbols_size, | |
5879 | unsigned int shndx, | |
5880 | unsigned int reloc_shndx, | |
5881 | unsigned int reloc_type); | |
5882 | #endif | |
5883 | ||
5884 | #ifdef HAVE_TARGET_64_LITTLE | |
5885 | template | |
5886 | void | |
5887 | Layout::add_to_gdb_index(bool is_type_unit, | |
5888 | Sized_relobj<64, false>* object, | |
5889 | const unsigned char* symbols, | |
5890 | off_t symbols_size, | |
5891 | unsigned int shndx, | |
5892 | unsigned int reloc_shndx, | |
5893 | unsigned int reloc_type); | |
5894 | #endif | |
5895 | ||
5896 | #ifdef HAVE_TARGET_64_BIG | |
5897 | template | |
5898 | void | |
5899 | Layout::add_to_gdb_index(bool is_type_unit, | |
5900 | Sized_relobj<64, true>* object, | |
5901 | const unsigned char* symbols, | |
5902 | off_t symbols_size, | |
5903 | unsigned int shndx, | |
5904 | unsigned int reloc_shndx, | |
5905 | unsigned int reloc_type); | |
5906 | #endif | |
5907 | ||
a2fb1b05 | 5908 | } // End namespace gold. |