Commit | Line | Data |
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a2fb1b05 ILT |
1 | // layout.cc -- lay out output file sections for gold |
2 | ||
219d1afa | 3 | // Copyright (C) 2006-2018 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" | |
b32e1756 IK |
37 | #ifdef __MINGW32__ |
38 | #include <windows.h> | |
39 | #include <rpcdce.h> | |
40 | #endif | |
a2fb1b05 | 41 | |
7e1edb90 | 42 | #include "parameters.h" |
14144f39 | 43 | #include "options.h" |
7d9e3d98 | 44 | #include "mapfile.h" |
a445fddf ILT |
45 | #include "script.h" |
46 | #include "script-sections.h" | |
a2fb1b05 | 47 | #include "output.h" |
f6ce93d6 | 48 | #include "symtab.h" |
a3ad94ed | 49 | #include "dynobj.h" |
3151305a | 50 | #include "ehframe.h" |
c1027032 | 51 | #include "gdb-index.h" |
96803768 | 52 | #include "compressed_output.h" |
62b01cb5 | 53 | #include "reduced_debug_output.h" |
487b39df | 54 | #include "object.h" |
6a74a719 | 55 | #include "reloc.h" |
2a00e4fb | 56 | #include "descriptors.h" |
2756a258 | 57 | #include "plugin.h" |
3ce2c28e ILT |
58 | #include "incremental.h" |
59 | #include "layout.h" | |
a2fb1b05 ILT |
60 | |
61 | namespace gold | |
62 | { | |
63 | ||
cdc29364 CC |
64 | // Class Free_list. |
65 | ||
66 | // The total number of free lists used. | |
67 | unsigned int Free_list::num_lists = 0; | |
68 | // The total number of free list nodes used. | |
69 | unsigned int Free_list::num_nodes = 0; | |
70 | // The total number of calls to Free_list::remove. | |
71 | unsigned int Free_list::num_removes = 0; | |
72 | // The total number of nodes visited during calls to Free_list::remove. | |
73 | unsigned int Free_list::num_remove_visits = 0; | |
74 | // The total number of calls to Free_list::allocate. | |
75 | unsigned int Free_list::num_allocates = 0; | |
76 | // The total number of nodes visited during calls to Free_list::allocate. | |
77 | unsigned int Free_list::num_allocate_visits = 0; | |
78 | ||
79 | // Initialize the free list. Creates a single free list node that | |
80 | // describes the entire region of length LEN. If EXTEND is true, | |
81 | // allocate() is allowed to extend the region beyond its initial | |
82 | // length. | |
83 | ||
84 | void | |
85 | Free_list::init(off_t len, bool extend) | |
86 | { | |
87 | this->list_.push_front(Free_list_node(0, len)); | |
88 | this->last_remove_ = this->list_.begin(); | |
89 | this->extend_ = extend; | |
90 | this->length_ = len; | |
91 | ++Free_list::num_lists; | |
92 | ++Free_list::num_nodes; | |
93 | } | |
94 | ||
95 | // Remove a chunk from the free list. Because we start with a single | |
96 | // node that covers the entire section, and remove chunks from it one | |
97 | // at a time, we do not need to coalesce chunks or handle cases that | |
98 | // span more than one free node. We expect to remove chunks from the | |
99 | // free list in order, and we expect to have only a few chunks of free | |
100 | // space left (corresponding to files that have changed since the last | |
101 | // incremental link), so a simple linear list should provide sufficient | |
102 | // performance. | |
103 | ||
104 | void | |
105 | Free_list::remove(off_t start, off_t end) | |
106 | { | |
107 | if (start == end) | |
108 | return; | |
109 | gold_assert(start < end); | |
110 | ||
111 | ++Free_list::num_removes; | |
112 | ||
113 | Iterator p = this->last_remove_; | |
114 | if (p->start_ > start) | |
115 | p = this->list_.begin(); | |
116 | ||
117 | for (; p != this->list_.end(); ++p) | |
118 | { | |
119 | ++Free_list::num_remove_visits; | |
120 | // Find a node that wholly contains the indicated region. | |
121 | if (p->start_ <= start && p->end_ >= end) | |
122 | { | |
123 | // Case 1: the indicated region spans the whole node. | |
124 | // Add some fuzz to avoid creating tiny free chunks. | |
125 | if (p->start_ + 3 >= start && p->end_ <= end + 3) | |
126 | p = this->list_.erase(p); | |
127 | // Case 2: remove a chunk from the start of the node. | |
128 | else if (p->start_ + 3 >= start) | |
129 | p->start_ = end; | |
130 | // Case 3: remove a chunk from the end of the node. | |
131 | else if (p->end_ <= end + 3) | |
132 | p->end_ = start; | |
133 | // Case 4: remove a chunk from the middle, and split | |
134 | // the node into two. | |
135 | else | |
136 | { | |
137 | Free_list_node newnode(p->start_, start); | |
138 | p->start_ = end; | |
139 | this->list_.insert(p, newnode); | |
140 | ++Free_list::num_nodes; | |
141 | } | |
142 | this->last_remove_ = p; | |
143 | return; | |
144 | } | |
145 | } | |
146 | ||
147 | // Did not find a node containing the given chunk. This could happen | |
148 | // because a small chunk was already removed due to the fuzz. | |
149 | gold_debug(DEBUG_INCREMENTAL, | |
150 | "Free_list::remove(%d,%d) not found", | |
151 | static_cast<int>(start), static_cast<int>(end)); | |
152 | } | |
153 | ||
154 | // Allocate a chunk of size LEN from the free list. Returns -1ULL | |
155 | // if a sufficiently large chunk of free space is not found. | |
156 | // We use a simple first-fit algorithm. | |
157 | ||
158 | off_t | |
159 | Free_list::allocate(off_t len, uint64_t align, off_t minoff) | |
160 | { | |
161 | gold_debug(DEBUG_INCREMENTAL, | |
2e702c99 RM |
162 | "Free_list::allocate(%08lx, %d, %08lx)", |
163 | static_cast<long>(len), static_cast<int>(align), | |
164 | static_cast<long>(minoff)); | |
cdc29364 CC |
165 | if (len == 0) |
166 | return align_address(minoff, align); | |
167 | ||
168 | ++Free_list::num_allocates; | |
169 | ||
8ea8cd50 CC |
170 | // We usually want to drop free chunks smaller than 4 bytes. |
171 | // If we need to guarantee a minimum hole size, though, we need | |
172 | // to keep track of all free chunks. | |
173 | const int fuzz = this->min_hole_ > 0 ? 0 : 3; | |
174 | ||
cdc29364 CC |
175 | for (Iterator p = this->list_.begin(); p != this->list_.end(); ++p) |
176 | { | |
177 | ++Free_list::num_allocate_visits; | |
178 | off_t start = p->start_ > minoff ? p->start_ : minoff; | |
179 | start = align_address(start, align); | |
180 | off_t end = start + len; | |
9fbd3822 CC |
181 | if (end > p->end_ && p->end_ == this->length_ && this->extend_) |
182 | { | |
183 | this->length_ = end; | |
184 | p->end_ = end; | |
185 | } | |
8ea8cd50 | 186 | if (end == p->end_ || (end <= p->end_ - this->min_hole_)) |
cdc29364 | 187 | { |
8ea8cd50 | 188 | if (p->start_ + fuzz >= start && p->end_ <= end + fuzz) |
cdc29364 | 189 | this->list_.erase(p); |
8ea8cd50 | 190 | else if (p->start_ + fuzz >= start) |
cdc29364 | 191 | p->start_ = end; |
8ea8cd50 | 192 | else if (p->end_ <= end + fuzz) |
cdc29364 CC |
193 | p->end_ = start; |
194 | else | |
195 | { | |
196 | Free_list_node newnode(p->start_, start); | |
197 | p->start_ = end; | |
198 | this->list_.insert(p, newnode); | |
199 | ++Free_list::num_nodes; | |
200 | } | |
201 | return start; | |
202 | } | |
203 | } | |
9fbd3822 CC |
204 | if (this->extend_) |
205 | { | |
206 | off_t start = align_address(this->length_, align); | |
207 | this->length_ = start + len; | |
208 | return start; | |
209 | } | |
cdc29364 CC |
210 | return -1; |
211 | } | |
212 | ||
213 | // Dump the free list (for debugging). | |
214 | void | |
215 | Free_list::dump() | |
216 | { | |
217 | gold_info("Free list:\n start end length\n"); | |
218 | for (Iterator p = this->list_.begin(); p != this->list_.end(); ++p) | |
219 | gold_info(" %08lx %08lx %08lx", static_cast<long>(p->start_), | |
220 | static_cast<long>(p->end_), | |
221 | static_cast<long>(p->end_ - p->start_)); | |
222 | } | |
223 | ||
224 | // Print the statistics for the free lists. | |
225 | void | |
226 | Free_list::print_stats() | |
227 | { | |
228 | fprintf(stderr, _("%s: total free lists: %u\n"), | |
2e702c99 | 229 | program_name, Free_list::num_lists); |
cdc29364 | 230 | fprintf(stderr, _("%s: total free list nodes: %u\n"), |
2e702c99 | 231 | program_name, Free_list::num_nodes); |
cdc29364 | 232 | fprintf(stderr, _("%s: calls to Free_list::remove: %u\n"), |
2e702c99 | 233 | program_name, Free_list::num_removes); |
cdc29364 | 234 | fprintf(stderr, _("%s: nodes visited: %u\n"), |
2e702c99 | 235 | program_name, Free_list::num_remove_visits); |
cdc29364 | 236 | fprintf(stderr, _("%s: calls to Free_list::allocate: %u\n"), |
2e702c99 | 237 | program_name, Free_list::num_allocates); |
cdc29364 | 238 | fprintf(stderr, _("%s: nodes visited: %u\n"), |
2e702c99 | 239 | program_name, Free_list::num_allocate_visits); |
cdc29364 CC |
240 | } |
241 | ||
e7c5ea40 | 242 | // A Hash_task computes the MD5 checksum of an array of char. |
e7c5ea40 CC |
243 | |
244 | class Hash_task : public Task | |
245 | { | |
246 | public: | |
9c7fe3c5 CC |
247 | Hash_task(Output_file* of, |
248 | size_t offset, | |
bbc5ae17 RM |
249 | size_t size, |
250 | unsigned char* dst, | |
bbc5ae17 | 251 | Task_token* final_blocker) |
9c7fe3c5 | 252 | : of_(of), offset_(offset), size_(size), dst_(dst), |
e7c5ea40 CC |
253 | final_blocker_(final_blocker) |
254 | { } | |
255 | ||
256 | void | |
257 | run(Workqueue*) | |
9c7fe3c5 CC |
258 | { |
259 | const unsigned char* iv = | |
260 | this->of_->get_input_view(this->offset_, this->size_); | |
261 | md5_buffer(reinterpret_cast<const char*>(iv), this->size_, this->dst_); | |
262 | this->of_->free_input_view(this->offset_, this->size_, iv); | |
263 | } | |
e7c5ea40 CC |
264 | |
265 | Task_token* | |
9c7fe3c5 CC |
266 | is_runnable() |
267 | { return NULL; } | |
e7c5ea40 CC |
268 | |
269 | // Unblock FINAL_BLOCKER_ when done. | |
270 | void | |
271 | locks(Task_locker* tl) | |
272 | { tl->add(this, this->final_blocker_); } | |
273 | ||
274 | std::string | |
275 | get_name() const | |
276 | { return "Hash_task"; } | |
277 | ||
278 | private: | |
9c7fe3c5 CC |
279 | Output_file* of_; |
280 | const size_t offset_; | |
e7c5ea40 CC |
281 | const size_t size_; |
282 | unsigned char* const dst_; | |
e7c5ea40 CC |
283 | Task_token* const final_blocker_; |
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), |
62b01cb5 ILT |
452 | debug_abbrev_(NULL), |
453 | debug_info_(NULL), | |
d491d34e ILT |
454 | group_signatures_(), |
455 | output_file_size_(-1), | |
d7bb5745 | 456 | have_added_input_section_(false), |
e55bde5e | 457 | sections_are_attached_(false), |
35cdfc9a ILT |
458 | input_requires_executable_stack_(false), |
459 | input_with_gnu_stack_note_(false), | |
535890bb | 460 | input_without_gnu_stack_note_(false), |
17a1d0a9 | 461 | has_static_tls_(false), |
e55bde5e | 462 | any_postprocessing_sections_(false), |
3ce2c28e | 463 | resized_signatures_(false), |
1518dc8f | 464 | have_stabstr_section_(false), |
e9552f7e | 465 | section_ordering_specified_(false), |
16164a6b | 466 | unique_segment_for_sections_specified_(false), |
20e6d0d6 DK |
467 | incremental_inputs_(NULL), |
468 | record_output_section_data_from_script_(false), | |
469 | script_output_section_data_list_(), | |
470 | segment_states_(NULL), | |
cdc29364 | 471 | relaxation_debug_check_(NULL), |
f0558624 | 472 | section_order_map_(), |
16164a6b | 473 | section_segment_map_(), |
e9552f7e ST |
474 | input_section_position_(), |
475 | input_section_glob_(), | |
cdc29364 CC |
476 | incremental_base_(NULL), |
477 | free_list_() | |
54dc6425 ILT |
478 | { |
479 | // Make space for more than enough segments for a typical file. | |
480 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
481 | this->segment_list_.reserve(12); |
482 | ||
27bc2bce ILT |
483 | // We expect two unattached Output_data objects: the file header and |
484 | // the segment headers. | |
485 | this->special_output_list_.reserve(2); | |
3ce2c28e ILT |
486 | |
487 | // Initialize structure needed for an incremental build. | |
8c21d9d3 | 488 | if (parameters->incremental()) |
3ce2c28e | 489 | this->incremental_inputs_ = new Incremental_inputs; |
f7c8a183 ILT |
490 | |
491 | // The section name pool is worth optimizing in all cases, because | |
492 | // it is small, but there are often overlaps due to .rel sections. | |
493 | this->namepool_.set_optimize(); | |
54dc6425 ILT |
494 | } |
495 | ||
cdc29364 CC |
496 | // For incremental links, record the base file to be modified. |
497 | ||
498 | void | |
499 | Layout::set_incremental_base(Incremental_binary* base) | |
500 | { | |
501 | this->incremental_base_ = base; | |
502 | this->free_list_.init(base->output_file()->filesize(), true); | |
503 | } | |
504 | ||
a2fb1b05 ILT |
505 | // Hash a key we use to look up an output section mapping. |
506 | ||
507 | size_t | |
508 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
509 | { | |
f0641a0b | 510 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
511 | } |
512 | ||
fb1b895d CC |
513 | // These are the debug sections that are actually used by gdb. |
514 | // Currently, we've checked versions of gdb up to and including 7.4. | |
515 | // We only check the part of the name that follows ".debug_" or | |
516 | // ".zdebug_". | |
02d2ba74 ILT |
517 | |
518 | static const char* gdb_sections[] = | |
fb1b895d CC |
519 | { |
520 | "abbrev", | |
521 | "addr", // Fission extension | |
522 | // "aranges", // not used by gdb as of 7.4 | |
523 | "frame", | |
982bbd97 | 524 | "gdb_scripts", |
fb1b895d CC |
525 | "info", |
526 | "types", | |
527 | "line", | |
528 | "loc", | |
529 | "macinfo", | |
530 | "macro", | |
531 | // "pubnames", // not used by gdb as of 7.4 | |
532 | // "pubtypes", // not used by gdb as of 7.4 | |
982bbd97 CC |
533 | // "gnu_pubnames", // Fission extension |
534 | // "gnu_pubtypes", // Fission extension | |
fb1b895d CC |
535 | "ranges", |
536 | "str", | |
982bbd97 | 537 | "str_offsets", |
02d2ba74 ILT |
538 | }; |
539 | ||
fb1b895d CC |
540 | // This is the minimum set of sections needed for line numbers. |
541 | ||
62b01cb5 | 542 | static const char* lines_only_debug_sections[] = |
fb1b895d CC |
543 | { |
544 | "abbrev", | |
545 | // "addr", // Fission extension | |
546 | // "aranges", // not used by gdb as of 7.4 | |
547 | // "frame", | |
982bbd97 | 548 | // "gdb_scripts", |
fb1b895d CC |
549 | "info", |
550 | // "types", | |
551 | "line", | |
552 | // "loc", | |
553 | // "macinfo", | |
554 | // "macro", | |
555 | // "pubnames", // not used by gdb as of 7.4 | |
556 | // "pubtypes", // not used by gdb as of 7.4 | |
982bbd97 CC |
557 | // "gnu_pubnames", // Fission extension |
558 | // "gnu_pubtypes", // Fission extension | |
fb1b895d CC |
559 | // "ranges", |
560 | "str", | |
982bbd97 | 561 | "str_offsets", // Fission extension |
fb1b895d CC |
562 | }; |
563 | ||
564 | // These sections are the DWARF fast-lookup tables, and are not needed | |
565 | // when building a .gdb_index section. | |
566 | ||
567 | static const char* gdb_fast_lookup_sections[] = | |
568 | { | |
569 | "aranges", | |
570 | "pubnames", | |
4320c691 | 571 | "gnu_pubnames", |
fb1b895d | 572 | "pubtypes", |
4320c691 | 573 | "gnu_pubtypes", |
62b01cb5 ILT |
574 | }; |
575 | ||
fb1b895d CC |
576 | // Returns whether the given debug section is in the list of |
577 | // debug-sections-used-by-some-version-of-gdb. SUFFIX is the | |
578 | // portion of the name following ".debug_" or ".zdebug_". | |
579 | ||
02d2ba74 | 580 | static inline bool |
fb1b895d | 581 | is_gdb_debug_section(const char* suffix) |
02d2ba74 ILT |
582 | { |
583 | // We can do this faster: binary search or a hashtable. But why bother? | |
584 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) | |
fb1b895d | 585 | if (strcmp(suffix, gdb_sections[i]) == 0) |
02d2ba74 ILT |
586 | return true; |
587 | return false; | |
588 | } | |
589 | ||
fb1b895d CC |
590 | // Returns whether the given section is needed for lines-only debugging. |
591 | ||
62b01cb5 | 592 | static inline bool |
fb1b895d | 593 | is_lines_only_debug_section(const char* suffix) |
62b01cb5 ILT |
594 | { |
595 | // We can do this faster: binary search or a hashtable. But why bother? | |
596 | for (size_t i = 0; | |
597 | i < sizeof(lines_only_debug_sections)/sizeof(*lines_only_debug_sections); | |
598 | ++i) | |
fb1b895d CC |
599 | if (strcmp(suffix, lines_only_debug_sections[i]) == 0) |
600 | return true; | |
601 | return false; | |
602 | } | |
603 | ||
604 | // Returns whether the given section is a fast-lookup section that | |
605 | // will not be needed when building a .gdb_index section. | |
606 | ||
607 | static inline bool | |
608 | is_gdb_fast_lookup_section(const char* suffix) | |
609 | { | |
610 | // We can do this faster: binary search or a hashtable. But why bother? | |
611 | for (size_t i = 0; | |
612 | i < sizeof(gdb_fast_lookup_sections)/sizeof(*gdb_fast_lookup_sections); | |
613 | ++i) | |
614 | if (strcmp(suffix, gdb_fast_lookup_sections[i]) == 0) | |
62b01cb5 ILT |
615 | return true; |
616 | return false; | |
617 | } | |
618 | ||
6fc6ea19 CC |
619 | // Sometimes we compress sections. This is typically done for |
620 | // sections that are not part of normal program execution (such as | |
621 | // .debug_* sections), and where the readers of these sections know | |
622 | // how to deal with compressed sections. This routine doesn't say for | |
623 | // certain whether we'll compress -- it depends on commandline options | |
624 | // as well -- just whether this section is a candidate for compression. | |
625 | // (The Output_compressed_section class decides whether to compress | |
626 | // a given section, and picks the name of the compressed section.) | |
627 | ||
628 | static bool | |
629 | is_compressible_debug_section(const char* secname) | |
630 | { | |
631 | return (is_prefix_of(".debug", secname)); | |
632 | } | |
633 | ||
634 | // We may see compressed debug sections in input files. Return TRUE | |
635 | // if this is the name of a compressed debug section. | |
636 | ||
637 | bool | |
638 | is_compressed_debug_section(const char* secname) | |
639 | { | |
640 | return (is_prefix_of(".zdebug", secname)); | |
641 | } | |
642 | ||
dd68f8fa CC |
643 | std::string |
644 | corresponding_uncompressed_section_name(std::string secname) | |
645 | { | |
646 | gold_assert(secname[0] == '.' && secname[1] == 'z'); | |
647 | std::string ret("."); | |
648 | ret.append(secname, 2, std::string::npos); | |
649 | return ret; | |
650 | } | |
651 | ||
a2fb1b05 ILT |
652 | // Whether to include this section in the link. |
653 | ||
654 | template<int size, bool big_endian> | |
655 | bool | |
6fa2a40b | 656 | Layout::include_section(Sized_relobj_file<size, big_endian>*, const char* name, |
a2fb1b05 ILT |
657 | const elfcpp::Shdr<size, big_endian>& shdr) |
658 | { | |
ae034989 ST |
659 | if (!parameters->options().relocatable() |
660 | && (shdr.get_sh_flags() & elfcpp::SHF_EXCLUDE)) | |
fd06b4aa CC |
661 | return false; |
662 | ||
99fd8cff CC |
663 | elfcpp::Elf_Word sh_type = shdr.get_sh_type(); |
664 | ||
665 | if ((sh_type >= elfcpp::SHT_LOOS && sh_type <= elfcpp::SHT_HIOS) | |
666 | || (sh_type >= elfcpp::SHT_LOPROC && sh_type <= elfcpp::SHT_HIPROC)) | |
667 | return parameters->target().should_include_section(sh_type); | |
668 | ||
669 | switch (sh_type) | |
a2fb1b05 ILT |
670 | { |
671 | case elfcpp::SHT_NULL: | |
672 | case elfcpp::SHT_SYMTAB: | |
673 | case elfcpp::SHT_DYNSYM: | |
a2fb1b05 ILT |
674 | case elfcpp::SHT_HASH: |
675 | case elfcpp::SHT_DYNAMIC: | |
676 | case elfcpp::SHT_SYMTAB_SHNDX: | |
677 | return false; | |
678 | ||
5cb66f97 ILT |
679 | case elfcpp::SHT_STRTAB: |
680 | // Discard the sections which have special meanings in the ELF | |
681 | // ABI. Keep others (e.g., .stabstr). We could also do this by | |
682 | // checking the sh_link fields of the appropriate sections. | |
683 | return (strcmp(name, ".dynstr") != 0 | |
684 | && strcmp(name, ".strtab") != 0 | |
685 | && strcmp(name, ".shstrtab") != 0); | |
686 | ||
a2fb1b05 ILT |
687 | case elfcpp::SHT_RELA: |
688 | case elfcpp::SHT_REL: | |
689 | case elfcpp::SHT_GROUP: | |
7019cd25 ILT |
690 | // If we are emitting relocations these should be handled |
691 | // elsewhere. | |
1e2bee4f | 692 | gold_assert(!parameters->options().relocatable()); |
6a74a719 | 693 | return false; |
a2fb1b05 | 694 | |
9e2dcb77 | 695 | case elfcpp::SHT_PROGBITS: |
8851ecca | 696 | if (parameters->options().strip_debug() |
9e2dcb77 ILT |
697 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
698 | { | |
e94cf127 | 699 | if (is_debug_info_section(name)) |
9e2dcb77 ILT |
700 | return false; |
701 | } | |
62b01cb5 ILT |
702 | if (parameters->options().strip_debug_non_line() |
703 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
704 | { | |
705 | // Debugging sections can only be recognized by name. | |
fb1b895d CC |
706 | if (is_prefix_of(".debug_", name) |
707 | && !is_lines_only_debug_section(name + 7)) | |
708 | return false; | |
709 | if (is_prefix_of(".zdebug_", name) | |
710 | && !is_lines_only_debug_section(name + 8)) | |
62b01cb5 ILT |
711 | return false; |
712 | } | |
8851ecca | 713 | if (parameters->options().strip_debug_gdb() |
02d2ba74 ILT |
714 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
715 | { | |
716 | // Debugging sections can only be recognized by name. | |
fb1b895d CC |
717 | if (is_prefix_of(".debug_", name) |
718 | && !is_gdb_debug_section(name + 7)) | |
719 | return false; | |
720 | if (is_prefix_of(".zdebug_", name) | |
721 | && !is_gdb_debug_section(name + 8)) | |
722 | return false; | |
723 | } | |
724 | if (parameters->options().gdb_index() | |
725 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
726 | { | |
727 | // When building .gdb_index, we can strip .debug_pubnames, | |
728 | // .debug_pubtypes, and .debug_aranges sections. | |
729 | if (is_prefix_of(".debug_", name) | |
730 | && is_gdb_fast_lookup_section(name + 7)) | |
731 | return false; | |
732 | if (is_prefix_of(".zdebug_", name) | |
733 | && is_gdb_fast_lookup_section(name + 8)) | |
02d2ba74 ILT |
734 | return false; |
735 | } | |
fd06b4aa | 736 | if (parameters->options().strip_lto_sections() |
2e702c99 RM |
737 | && !parameters->options().relocatable() |
738 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
739 | { | |
740 | // Ignore LTO sections containing intermediate code. | |
741 | if (is_prefix_of(".gnu.lto_", name)) | |
742 | return false; | |
743 | } | |
6b7dd3f3 ILT |
744 | // The GNU linker strips .gnu_debuglink sections, so we do too. |
745 | // This is a feature used to keep debugging information in | |
746 | // separate files. | |
747 | if (strcmp(name, ".gnu_debuglink") == 0) | |
748 | return false; | |
9e2dcb77 ILT |
749 | return true; |
750 | ||
a2fb1b05 | 751 | default: |
a2fb1b05 ILT |
752 | return true; |
753 | } | |
754 | } | |
755 | ||
ead1e424 | 756 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 757 | |
a2fb1b05 | 758 | Output_section* |
ead1e424 | 759 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 760 | { |
a445fddf ILT |
761 | for (Section_list::const_iterator p = this->section_list_.begin(); |
762 | p != this->section_list_.end(); | |
ead1e424 | 763 | ++p) |
a445fddf ILT |
764 | if (strcmp((*p)->name(), name) == 0) |
765 | return *p; | |
ead1e424 ILT |
766 | return NULL; |
767 | } | |
a2fb1b05 | 768 | |
ead1e424 ILT |
769 | // Return an output segment of type TYPE, with segment flags SET set |
770 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 771 | |
ead1e424 ILT |
772 | Output_segment* |
773 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
774 | elfcpp::Elf_Word clear) const | |
775 | { | |
776 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
777 | p != this->segment_list_.end(); | |
778 | ++p) | |
779 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
780 | && ((*p)->flags() & set) == set | |
781 | && ((*p)->flags() & clear) == 0) | |
782 | return *p; | |
783 | return NULL; | |
784 | } | |
a2fb1b05 | 785 | |
487b39df ILT |
786 | // When we put a .ctors or .dtors section with more than one word into |
787 | // a .init_array or .fini_array section, we need to reverse the words | |
788 | // in the .ctors/.dtors section. This is because .init_array executes | |
789 | // constructors front to back, where .ctors executes them back to | |
790 | // front, and vice-versa for .fini_array/.dtors. Although we do want | |
791 | // to remap .ctors/.dtors into .init_array/.fini_array because it can | |
792 | // be more efficient, we don't want to change the order in which | |
793 | // constructors/destructors are run. This set just keeps track of | |
794 | // these sections which need to be reversed. It is only changed by | |
795 | // Layout::layout. It should be a private member of Layout, but that | |
796 | // would require layout.h to #include object.h to get the definition | |
797 | // of Section_id. | |
798 | static Unordered_set<Section_id, Section_id_hash> ctors_sections_in_init_array; | |
799 | ||
800 | // Return whether OBJECT/SHNDX is a .ctors/.dtors section mapped to a | |
801 | // .init_array/.fini_array section. | |
802 | ||
803 | bool | |
804 | Layout::is_ctors_in_init_array(Relobj* relobj, unsigned int shndx) const | |
805 | { | |
806 | return (ctors_sections_in_init_array.find(Section_id(relobj, shndx)) | |
807 | != ctors_sections_in_init_array.end()); | |
808 | } | |
809 | ||
ead1e424 | 810 | // Return the output section to use for section NAME with type TYPE |
a445fddf | 811 | // and section flags FLAGS. NAME must be canonicalized in the string |
10b4f102 ILT |
812 | // pool, and NAME_KEY is the key. ORDER is where this should appear |
813 | // in the output sections. IS_RELRO is true for a relro section. | |
a2fb1b05 | 814 | |
ead1e424 | 815 | Output_section* |
f0641a0b | 816 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
f5c870d2 | 817 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, |
22f0da72 | 818 | Output_section_order order, bool is_relro) |
ead1e424 | 819 | { |
5393d741 ILT |
820 | elfcpp::Elf_Word lookup_type = type; |
821 | ||
822 | // For lookup purposes, treat INIT_ARRAY, FINI_ARRAY, and | |
823 | // PREINIT_ARRAY like PROGBITS. This ensures that we combine | |
824 | // .init_array, .fini_array, and .preinit_array sections by name | |
825 | // whatever their type in the input file. We do this because the | |
826 | // types are not always right in the input files. | |
827 | if (lookup_type == elfcpp::SHT_INIT_ARRAY | |
828 | || lookup_type == elfcpp::SHT_FINI_ARRAY | |
829 | || lookup_type == elfcpp::SHT_PREINIT_ARRAY) | |
830 | lookup_type = elfcpp::SHT_PROGBITS; | |
831 | ||
154e0e9a ILT |
832 | elfcpp::Elf_Xword lookup_flags = flags; |
833 | ||
834 | // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine | |
835 | // read-write with read-only sections. Some other ELF linkers do | |
836 | // not do this. FIXME: Perhaps there should be an option | |
837 | // controlling this. | |
838 | lookup_flags &= ~(elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
839 | ||
5393d741 | 840 | const Key key(name_key, std::make_pair(lookup_type, lookup_flags)); |
a2fb1b05 ILT |
841 | const std::pair<Key, Output_section*> v(key, NULL); |
842 | std::pair<Section_name_map::iterator, bool> ins( | |
843 | this->section_name_map_.insert(v)); | |
844 | ||
a2fb1b05 | 845 | if (!ins.second) |
ead1e424 | 846 | return ins.first->second; |
a2fb1b05 ILT |
847 | else |
848 | { | |
849 | // This is the first time we've seen this name/type/flags | |
4e2b1697 ILT |
850 | // combination. For compatibility with the GNU linker, we |
851 | // combine sections with contents and zero flags with sections | |
852 | // with non-zero flags. This is a workaround for cases where | |
853 | // assembler code forgets to set section flags. FIXME: Perhaps | |
854 | // there should be an option to control this. | |
15cf077e | 855 | Output_section* os = NULL; |
4e2b1697 | 856 | |
5393d741 | 857 | if (lookup_type == elfcpp::SHT_PROGBITS) |
15cf077e | 858 | { |
2e702c99 RM |
859 | if (flags == 0) |
860 | { | |
861 | Output_section* same_name = this->find_output_section(name); | |
862 | if (same_name != NULL | |
863 | && (same_name->type() == elfcpp::SHT_PROGBITS | |
5393d741 ILT |
864 | || same_name->type() == elfcpp::SHT_INIT_ARRAY |
865 | || same_name->type() == elfcpp::SHT_FINI_ARRAY | |
866 | || same_name->type() == elfcpp::SHT_PREINIT_ARRAY) | |
2e702c99 RM |
867 | && (same_name->flags() & elfcpp::SHF_TLS) == 0) |
868 | os = same_name; | |
869 | } | |
870 | else if ((flags & elfcpp::SHF_TLS) == 0) | |
871 | { | |
872 | elfcpp::Elf_Xword zero_flags = 0; | |
873 | const Key zero_key(name_key, std::make_pair(lookup_type, | |
5393d741 | 874 | zero_flags)); |
2e702c99 RM |
875 | Section_name_map::iterator p = |
876 | this->section_name_map_.find(zero_key); | |
877 | if (p != this->section_name_map_.end()) | |
154e0e9a | 878 | os = p->second; |
2e702c99 | 879 | } |
15cf077e | 880 | } |
4e2b1697 | 881 | |
15cf077e | 882 | if (os == NULL) |
22f0da72 ILT |
883 | os = this->make_output_section(name, type, flags, order, is_relro); |
884 | ||
a2fb1b05 | 885 | ins.first->second = os; |
ead1e424 | 886 | return os; |
a2fb1b05 | 887 | } |
ead1e424 ILT |
888 | } |
889 | ||
b9b2ae8b NC |
890 | // Returns TRUE iff NAME (an input section from RELOBJ) will |
891 | // be mapped to an output section that should be KEPT. | |
892 | ||
893 | bool | |
894 | Layout::keep_input_section(const Relobj* relobj, const char* name) | |
895 | { | |
896 | if (! this->script_options_->saw_sections_clause()) | |
897 | return false; | |
898 | ||
899 | Script_sections* ss = this->script_options_->script_sections(); | |
900 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
901 | Output_section** output_section_slot; | |
902 | Script_sections::Section_type script_section_type; | |
903 | bool keep; | |
904 | ||
905 | name = ss->output_section_name(file_name, name, &output_section_slot, | |
412ffd83 | 906 | &script_section_type, &keep, true); |
b9b2ae8b NC |
907 | return name != NULL && keep; |
908 | } | |
909 | ||
16164a6b ST |
910 | // Clear the input section flags that should not be copied to the |
911 | // output section. | |
912 | ||
913 | elfcpp::Elf_Xword | |
914 | Layout::get_output_section_flags(elfcpp::Elf_Xword input_section_flags) | |
915 | { | |
916 | // Some flags in the input section should not be automatically | |
917 | // copied to the output section. | |
918 | input_section_flags &= ~ (elfcpp::SHF_INFO_LINK | |
919 | | elfcpp::SHF_GROUP | |
48058663 | 920 | | elfcpp::SHF_COMPRESSED |
16164a6b ST |
921 | | elfcpp::SHF_MERGE |
922 | | elfcpp::SHF_STRINGS); | |
923 | ||
924 | // We only clear the SHF_LINK_ORDER flag in for | |
925 | // a non-relocatable link. | |
926 | if (!parameters->options().relocatable()) | |
927 | input_section_flags &= ~elfcpp::SHF_LINK_ORDER; | |
928 | ||
929 | return input_section_flags; | |
930 | } | |
931 | ||
a445fddf ILT |
932 | // Pick the output section to use for section NAME, in input file |
933 | // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a | |
154e0e9a ILT |
934 | // linker created section. IS_INPUT_SECTION is true if we are |
935 | // choosing an output section for an input section found in a input | |
10b4f102 ILT |
936 | // file. ORDER is where this section should appear in the output |
937 | // sections. IS_RELRO is true for a relro section. This will return | |
412ffd83 CC |
938 | // NULL if the input section should be discarded. MATCH_INPUT_SPEC |
939 | // is true if the section name should be matched against input specs | |
940 | // in a linker script. | |
a445fddf ILT |
941 | |
942 | Output_section* | |
943 | Layout::choose_output_section(const Relobj* relobj, const char* name, | |
944 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
22f0da72 | 945 | bool is_input_section, Output_section_order order, |
412ffd83 CC |
946 | bool is_relro, bool is_reloc, |
947 | bool match_input_spec) | |
a445fddf | 948 | { |
154e0e9a ILT |
949 | // We should not see any input sections after we have attached |
950 | // sections to segments. | |
951 | gold_assert(!is_input_section || !this->sections_are_attached_); | |
952 | ||
16164a6b | 953 | flags = this->get_output_section_flags(flags); |
c9484ea5 | 954 | |
03fb64f8 | 955 | if (this->script_options_->saw_sections_clause() && !is_reloc) |
a445fddf ILT |
956 | { |
957 | // We are using a SECTIONS clause, so the output section is | |
958 | // chosen based only on the name. | |
959 | ||
960 | Script_sections* ss = this->script_options_->script_sections(); | |
961 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
962 | Output_section** output_section_slot; | |
1e5d2fb1 | 963 | Script_sections::Section_type script_section_type; |
7f8cd844 | 964 | const char* orig_name = name; |
b9b2ae8b | 965 | bool keep; |
1e5d2fb1 | 966 | name = ss->output_section_name(file_name, name, &output_section_slot, |
412ffd83 CC |
967 | &script_section_type, &keep, |
968 | match_input_spec); | |
b9b2ae8b | 969 | |
a445fddf ILT |
970 | if (name == NULL) |
971 | { | |
7f8cd844 NC |
972 | gold_debug(DEBUG_SCRIPT, _("Unable to create output section '%s' " |
973 | "because it is not allowed by the " | |
974 | "SECTIONS clause of the linker script"), | |
975 | orig_name); | |
a445fddf ILT |
976 | // The SECTIONS clause says to discard this input section. |
977 | return NULL; | |
978 | } | |
979 | ||
1e5d2fb1 DK |
980 | // We can only handle script section types ST_NONE and ST_NOLOAD. |
981 | switch (script_section_type) | |
982 | { | |
983 | case Script_sections::ST_NONE: | |
984 | break; | |
985 | case Script_sections::ST_NOLOAD: | |
986 | flags &= elfcpp::SHF_ALLOC; | |
987 | break; | |
988 | default: | |
989 | gold_unreachable(); | |
990 | } | |
991 | ||
a445fddf ILT |
992 | // If this is an orphan section--one not mentioned in the linker |
993 | // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the | |
994 | // default processing below. | |
995 | ||
996 | if (output_section_slot != NULL) | |
997 | { | |
998 | if (*output_section_slot != NULL) | |
9c547ec3 ILT |
999 | { |
1000 | (*output_section_slot)->update_flags_for_input_section(flags); | |
1001 | return *output_section_slot; | |
1002 | } | |
a445fddf ILT |
1003 | |
1004 | // We don't put sections found in the linker script into | |
1005 | // SECTION_NAME_MAP_. That keeps us from getting confused | |
1006 | // if an orphan section is mapped to a section with the same | |
1007 | // name as one in the linker script. | |
1008 | ||
1009 | name = this->namepool_.add(name, false, NULL); | |
1010 | ||
22f0da72 ILT |
1011 | Output_section* os = this->make_output_section(name, type, flags, |
1012 | order, is_relro); | |
1013 | ||
a445fddf | 1014 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
1015 | |
1016 | // Special handling for NOLOAD sections. | |
1017 | if (script_section_type == Script_sections::ST_NOLOAD) | |
1018 | { | |
1019 | os->set_is_noload(); | |
1020 | ||
1021 | // The constructor of Output_section sets addresses of non-ALLOC | |
1022 | // sections to 0 by default. We don't want that for NOLOAD | |
1023 | // sections even if they have no SHF_ALLOC flag. | |
1024 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0 | |
1025 | && os->is_address_valid()) | |
1026 | { | |
1027 | gold_assert(os->address() == 0 | |
1028 | && !os->is_offset_valid() | |
1029 | && !os->is_data_size_valid()); | |
1030 | os->reset_address_and_file_offset(); | |
1031 | } | |
1032 | } | |
1033 | ||
a445fddf ILT |
1034 | *output_section_slot = os; |
1035 | return os; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | // FIXME: Handle SHF_OS_NONCONFORMING somewhere. | |
1040 | ||
6fc6ea19 | 1041 | size_t len = strlen(name); |
dd68f8fa | 1042 | std::string uncompressed_name; |
6fc6ea19 CC |
1043 | |
1044 | // Compressed debug sections should be mapped to the corresponding | |
1045 | // uncompressed section. | |
1046 | if (is_compressed_debug_section(name)) | |
1047 | { | |
dd68f8fa CC |
1048 | uncompressed_name = |
1049 | corresponding_uncompressed_section_name(std::string(name, len)); | |
1050 | name = uncompressed_name.c_str(); | |
1051 | len = uncompressed_name.length(); | |
6fc6ea19 CC |
1052 | } |
1053 | ||
a445fddf ILT |
1054 | // Turn NAME from the name of the input section into the name of the |
1055 | // output section. | |
401a9a73 CC |
1056 | if (is_input_section |
1057 | && !this->script_options_->saw_sections_clause() | |
1058 | && !parameters->options().relocatable()) | |
921b5322 AM |
1059 | { |
1060 | const char *orig_name = name; | |
1061 | name = parameters->target().output_section_name(relobj, name, &len); | |
1062 | if (name == NULL) | |
1063 | name = Layout::output_section_name(relobj, orig_name, &len); | |
1064 | } | |
a445fddf ILT |
1065 | |
1066 | Stringpool::Key name_key; | |
1067 | name = this->namepool_.add_with_length(name, len, true, &name_key); | |
1068 | ||
1069 | // Find or make the output section. The output section is selected | |
1070 | // based on the section name, type, and flags. | |
22f0da72 | 1071 | return this->get_output_section(name, name_key, type, flags, order, is_relro); |
a445fddf ILT |
1072 | } |
1073 | ||
cdc29364 CC |
1074 | // For incremental links, record the initial fixed layout of a section |
1075 | // from the base file, and return a pointer to the Output_section. | |
1076 | ||
1077 | template<int size, bool big_endian> | |
1078 | Output_section* | |
1079 | Layout::init_fixed_output_section(const char* name, | |
1080 | elfcpp::Shdr<size, big_endian>& shdr) | |
1081 | { | |
1082 | unsigned int sh_type = shdr.get_sh_type(); | |
1083 | ||
aa06ae28 CC |
1084 | // We preserve the layout of PROGBITS, NOBITS, INIT_ARRAY, FINI_ARRAY, |
1085 | // PRE_INIT_ARRAY, and NOTE sections. | |
cdc29364 | 1086 | // All others will be created from scratch and reallocated. |
aa06ae28 | 1087 | if (!can_incremental_update(sh_type)) |
cdc29364 CC |
1088 | return NULL; |
1089 | ||
c1027032 CC |
1090 | // If we're generating a .gdb_index section, we need to regenerate |
1091 | // it from scratch. | |
1092 | if (parameters->options().gdb_index() | |
1093 | && sh_type == elfcpp::SHT_PROGBITS | |
1094 | && strcmp(name, ".gdb_index") == 0) | |
1095 | return NULL; | |
1096 | ||
cdc29364 CC |
1097 | typename elfcpp::Elf_types<size>::Elf_Addr sh_addr = shdr.get_sh_addr(); |
1098 | typename elfcpp::Elf_types<size>::Elf_Off sh_offset = shdr.get_sh_offset(); | |
1099 | typename elfcpp::Elf_types<size>::Elf_WXword sh_size = shdr.get_sh_size(); | |
1100 | typename elfcpp::Elf_types<size>::Elf_WXword sh_flags = shdr.get_sh_flags(); | |
1101 | typename elfcpp::Elf_types<size>::Elf_WXword sh_addralign = | |
1102 | shdr.get_sh_addralign(); | |
1103 | ||
1104 | // Make the output section. | |
1105 | Stringpool::Key name_key; | |
1106 | name = this->namepool_.add(name, true, &name_key); | |
1107 | Output_section* os = this->get_output_section(name, name_key, sh_type, | |
2e702c99 | 1108 | sh_flags, ORDER_INVALID, false); |
cdc29364 CC |
1109 | os->set_fixed_layout(sh_addr, sh_offset, sh_size, sh_addralign); |
1110 | if (sh_type != elfcpp::SHT_NOBITS) | |
1111 | this->free_list_.remove(sh_offset, sh_offset + sh_size); | |
1112 | return os; | |
1113 | } | |
1114 | ||
edcac0c1 ILT |
1115 | // Return the index by which an input section should be ordered. This |
1116 | // is used to sort some .text sections, for compatibility with GNU ld. | |
1117 | ||
1118 | int | |
1119 | Layout::special_ordering_of_input_section(const char* name) | |
1120 | { | |
1121 | // The GNU linker has some special handling for some sections that | |
1122 | // wind up in the .text section. Sections that start with these | |
1123 | // prefixes must appear first, and must appear in the order listed | |
1124 | // here. | |
bbc5ae17 | 1125 | static const char* const text_section_sort[] = |
edcac0c1 ILT |
1126 | { |
1127 | ".text.unlikely", | |
1128 | ".text.exit", | |
1129 | ".text.startup", | |
1130 | ".text.hot" | |
1131 | }; | |
1132 | ||
1133 | for (size_t i = 0; | |
1134 | i < sizeof(text_section_sort) / sizeof(text_section_sort[0]); | |
1135 | i++) | |
1136 | if (is_prefix_of(text_section_sort[i], name)) | |
1137 | return i; | |
1138 | ||
1139 | return -1; | |
1140 | } | |
1141 | ||
ead1e424 | 1142 | // Return the output section to use for input section SHNDX, with name |
730cdc88 ILT |
1143 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
1144 | // index of a relocation section which applies to this section, or 0 | |
1145 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
1146 | // relocation section if there is one. Set *OFF to the offset of this | |
1147 | // input section without the output section. Return NULL if the | |
1148 | // section should be discarded. Set *OFF to -1 if the section | |
1149 | // contents should not be written directly to the output file, but | |
1150 | // will instead receive special handling. | |
ead1e424 ILT |
1151 | |
1152 | template<int size, bool big_endian> | |
1153 | Output_section* | |
6fa2a40b | 1154 | Layout::layout(Sized_relobj_file<size, big_endian>* object, unsigned int shndx, |
730cdc88 ILT |
1155 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, |
1156 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 | 1157 | { |
ef9beddf ILT |
1158 | *off = 0; |
1159 | ||
ead1e424 ILT |
1160 | if (!this->include_section(object, name, shdr)) |
1161 | return NULL; | |
1162 | ||
2a0ff005 | 1163 | elfcpp::Elf_Word sh_type = shdr.get_sh_type(); |
2a0ff005 | 1164 | |
6a74a719 ILT |
1165 | // In a relocatable link a grouped section must not be combined with |
1166 | // any other sections. | |
5393d741 | 1167 | Output_section* os; |
8851ecca | 1168 | if (parameters->options().relocatable() |
6a74a719 ILT |
1169 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
1170 | { | |
f54f5e31 L |
1171 | // Some flags in the input section should not be automatically |
1172 | // copied to the output section. | |
1173 | elfcpp::Elf_Xword flags = (shdr.get_sh_flags() | |
1174 | & ~ elfcpp::SHF_COMPRESSED); | |
6a74a719 | 1175 | name = this->namepool_.add(name, true, NULL); |
f54f5e31 | 1176 | os = this->make_output_section(name, sh_type, flags, |
22f0da72 | 1177 | ORDER_INVALID, false); |
6a74a719 ILT |
1178 | } |
1179 | else | |
1180 | { | |
3b4190cc ST |
1181 | // All ".text.unlikely.*" sections can be moved to a unique |
1182 | // segment with --text-unlikely-segment option. | |
1183 | bool text_unlikely_segment | |
1184 | = (parameters->options().text_unlikely_segment() | |
1185 | && is_prefix_of(".text.unlikely", | |
1186 | object->section_name(shndx).c_str())); | |
1187 | if (text_unlikely_segment) | |
1188 | { | |
16164a6b ST |
1189 | elfcpp::Elf_Xword flags |
1190 | = this->get_output_section_flags(shdr.get_sh_flags()); | |
1191 | ||
16164a6b | 1192 | Stringpool::Key name_key; |
3b4190cc ST |
1193 | const char* os_name = this->namepool_.add(".text.unlikely", true, |
1194 | &name_key); | |
16164a6b ST |
1195 | os = this->get_output_section(os_name, name_key, sh_type, flags, |
1196 | ORDER_INVALID, false); | |
3b4190cc ST |
1197 | // Map this output section to a unique segment. This is done to |
1198 | // separate "text" that is not likely to be executed from "text" | |
1199 | // that is likely executed. | |
1200 | os->set_is_unique_segment(); | |
1201 | } | |
1202 | else | |
1203 | { | |
1204 | // Plugins can choose to place one or more subsets of sections in | |
1205 | // unique segments and this is done by mapping these section subsets | |
1206 | // to unique output sections. Check if this section needs to be | |
1207 | // remapped to a unique output section. | |
1208 | Section_segment_map::iterator it | |
1209 | = this->section_segment_map_.find(Const_section_id(object, shndx)); | |
1210 | if (it == this->section_segment_map_.end()) | |
16164a6b | 1211 | { |
3b4190cc ST |
1212 | os = this->choose_output_section(object, name, sh_type, |
1213 | shdr.get_sh_flags(), true, | |
1214 | ORDER_INVALID, false, false, | |
1215 | true); | |
16164a6b | 1216 | } |
3b4190cc ST |
1217 | else |
1218 | { | |
1219 | // We know the name of the output section, directly call | |
1220 | // get_output_section here by-passing choose_output_section. | |
1221 | elfcpp::Elf_Xword flags | |
1222 | = this->get_output_section_flags(shdr.get_sh_flags()); | |
1223 | ||
1224 | const char* os_name = it->second->name; | |
1225 | Stringpool::Key name_key; | |
1226 | os_name = this->namepool_.add(os_name, true, &name_key); | |
1227 | os = this->get_output_section(os_name, name_key, sh_type, flags, | |
1228 | ORDER_INVALID, false); | |
1229 | if (!os->is_unique_segment()) | |
1230 | { | |
1231 | os->set_is_unique_segment(); | |
1232 | os->set_extra_segment_flags(it->second->flags); | |
1233 | os->set_segment_alignment(it->second->align); | |
1234 | } | |
1235 | } | |
1236 | } | |
6a74a719 ILT |
1237 | if (os == NULL) |
1238 | return NULL; | |
1239 | } | |
a2fb1b05 | 1240 | |
2fd32231 | 1241 | // By default the GNU linker sorts input sections whose names match |
487b39df ILT |
1242 | // .ctors.*, .dtors.*, .init_array.*, or .fini_array.*. The |
1243 | // sections are sorted by name. This is used to implement | |
1244 | // constructor priority ordering. We are compatible. When we put | |
1245 | // .ctor sections in .init_array and .dtor sections in .fini_array, | |
1246 | // we must also sort plain .ctor and .dtor sections. | |
2fd32231 | 1247 | if (!this->script_options_->saw_sections_clause() |
5393d741 | 1248 | && !parameters->options().relocatable() |
2fd32231 ILT |
1249 | && (is_prefix_of(".ctors.", name) |
1250 | || is_prefix_of(".dtors.", name) | |
1251 | || is_prefix_of(".init_array.", name) | |
5393d741 ILT |
1252 | || is_prefix_of(".fini_array.", name) |
1253 | || (parameters->options().ctors_in_init_array() | |
1254 | && (strcmp(name, ".ctors") == 0 | |
1255 | || strcmp(name, ".dtors") == 0)))) | |
2fd32231 ILT |
1256 | os->set_must_sort_attached_input_sections(); |
1257 | ||
edcac0c1 ILT |
1258 | // By default the GNU linker sorts some special text sections ahead |
1259 | // of others. We are compatible. | |
c6ac678d ST |
1260 | if (parameters->options().text_reorder() |
1261 | && !this->script_options_->saw_sections_clause() | |
7c381248 | 1262 | && !this->is_section_ordering_specified() |
edcac0c1 ILT |
1263 | && !parameters->options().relocatable() |
1264 | && Layout::special_ordering_of_input_section(name) >= 0) | |
1265 | os->set_must_sort_attached_input_sections(); | |
1266 | ||
487b39df ILT |
1267 | // If this is a .ctors or .ctors.* section being mapped to a |
1268 | // .init_array section, or a .dtors or .dtors.* section being mapped | |
1269 | // to a .fini_array section, we will need to reverse the words if | |
1270 | // there is more than one. Record this section for later. See | |
1271 | // ctors_sections_in_init_array above. | |
1272 | if (!this->script_options_->saw_sections_clause() | |
1273 | && !parameters->options().relocatable() | |
1274 | && shdr.get_sh_size() > size / 8 | |
1275 | && (((strcmp(name, ".ctors") == 0 | |
1276 | || is_prefix_of(".ctors.", name)) | |
1277 | && strcmp(os->name(), ".init_array") == 0) | |
1278 | || ((strcmp(name, ".dtors") == 0 | |
1279 | || is_prefix_of(".dtors.", name)) | |
1280 | && strcmp(os->name(), ".fini_array") == 0))) | |
1281 | ctors_sections_in_init_array.insert(Section_id(object, shndx)); | |
1282 | ||
a2fb1b05 ILT |
1283 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
1284 | ||
5b7b7d6e ILT |
1285 | elfcpp::Elf_Xword orig_flags = os->flags(); |
1286 | ||
6e9ba2ca | 1287 | *off = os->add_input_section(this, object, shndx, name, shdr, reloc_shndx, |
a445fddf | 1288 | this->script_options_->saw_sections_clause()); |
5b7b7d6e ILT |
1289 | |
1290 | // If the flags changed, we may have to change the order. | |
1291 | if ((orig_flags & elfcpp::SHF_ALLOC) != 0) | |
1292 | { | |
1293 | orig_flags &= (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
1294 | elfcpp::Elf_Xword new_flags = | |
1295 | os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
1296 | if (orig_flags != new_flags) | |
1297 | os->set_order(this->default_section_order(os, false)); | |
1298 | } | |
1299 | ||
d7bb5745 | 1300 | this->have_added_input_section_ = true; |
a2fb1b05 ILT |
1301 | |
1302 | return os; | |
1303 | } | |
1304 | ||
16164a6b ST |
1305 | // Maps section SECN to SEGMENT s. |
1306 | void | |
1307 | Layout::insert_section_segment_map(Const_section_id secn, | |
1308 | Unique_segment_info *s) | |
1309 | { | |
bbc5ae17 | 1310 | gold_assert(this->unique_segment_for_sections_specified_); |
16164a6b ST |
1311 | this->section_segment_map_[secn] = s; |
1312 | } | |
1313 | ||
6a74a719 ILT |
1314 | // Handle a relocation section when doing a relocatable link. |
1315 | ||
1316 | template<int size, bool big_endian> | |
1317 | Output_section* | |
6fa2a40b | 1318 | Layout::layout_reloc(Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
1319 | unsigned int, |
1320 | const elfcpp::Shdr<size, big_endian>& shdr, | |
1321 | Output_section* data_section, | |
1322 | Relocatable_relocs* rr) | |
1323 | { | |
8851ecca ILT |
1324 | gold_assert(parameters->options().relocatable() |
1325 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
1326 | |
1327 | int sh_type = shdr.get_sh_type(); | |
1328 | ||
1329 | std::string name; | |
1330 | if (sh_type == elfcpp::SHT_REL) | |
1331 | name = ".rel"; | |
1332 | else if (sh_type == elfcpp::SHT_RELA) | |
1333 | name = ".rela"; | |
1334 | else | |
1335 | gold_unreachable(); | |
1336 | name += data_section->name(); | |
1337 | ||
bd288ea2 ILT |
1338 | // In a relocatable link relocs for a grouped section must not be |
1339 | // combined with other reloc sections. | |
1340 | Output_section* os; | |
1341 | if (!parameters->options().relocatable() | |
1342 | || (data_section->flags() & elfcpp::SHF_GROUP) == 0) | |
1343 | os = this->choose_output_section(object, name.c_str(), sh_type, | |
22f0da72 | 1344 | shdr.get_sh_flags(), false, |
412ffd83 | 1345 | ORDER_INVALID, false, true, false); |
bd288ea2 ILT |
1346 | else |
1347 | { | |
1348 | const char* n = this->namepool_.add(name.c_str(), true, NULL); | |
1349 | os = this->make_output_section(n, sh_type, shdr.get_sh_flags(), | |
22f0da72 | 1350 | ORDER_INVALID, false); |
bd288ea2 | 1351 | } |
6a74a719 ILT |
1352 | |
1353 | os->set_should_link_to_symtab(); | |
1354 | os->set_info_section(data_section); | |
1355 | ||
1356 | Output_section_data* posd; | |
1357 | if (sh_type == elfcpp::SHT_REL) | |
1358 | { | |
1359 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); | |
1360 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, | |
1361 | size, | |
1362 | big_endian>(rr); | |
1363 | } | |
1364 | else if (sh_type == elfcpp::SHT_RELA) | |
1365 | { | |
1366 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); | |
1367 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, | |
1368 | size, | |
1369 | big_endian>(rr); | |
1370 | } | |
1371 | else | |
1372 | gold_unreachable(); | |
1373 | ||
1374 | os->add_output_section_data(posd); | |
1375 | rr->set_output_data(posd); | |
1376 | ||
1377 | return os; | |
1378 | } | |
1379 | ||
1380 | // Handle a group section when doing a relocatable link. | |
1381 | ||
1382 | template<int size, bool big_endian> | |
1383 | void | |
1384 | Layout::layout_group(Symbol_table* symtab, | |
6fa2a40b | 1385 | Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
1386 | unsigned int, |
1387 | const char* group_section_name, | |
1388 | const char* signature, | |
1389 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
1390 | elfcpp::Elf_Word flags, |
1391 | std::vector<unsigned int>* shndxes) | |
6a74a719 | 1392 | { |
8851ecca | 1393 | gold_assert(parameters->options().relocatable()); |
6a74a719 ILT |
1394 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
1395 | group_section_name = this->namepool_.add(group_section_name, true, NULL); | |
1396 | Output_section* os = this->make_output_section(group_section_name, | |
1397 | elfcpp::SHT_GROUP, | |
f5c870d2 | 1398 | shdr.get_sh_flags(), |
22f0da72 | 1399 | ORDER_INVALID, false); |
6a74a719 ILT |
1400 | |
1401 | // We need to find a symbol with the signature in the symbol table. | |
755ab8af | 1402 | // If we don't find one now, we need to look again later. |
6a74a719 | 1403 | Symbol* sym = symtab->lookup(signature, NULL); |
755ab8af ILT |
1404 | if (sym != NULL) |
1405 | os->set_info_symndx(sym); | |
1406 | else | |
1407 | { | |
e55bde5e ILT |
1408 | // Reserve some space to minimize reallocations. |
1409 | if (this->group_signatures_.empty()) | |
1410 | this->group_signatures_.reserve(this->number_of_input_files_ * 16); | |
1411 | ||
755ab8af ILT |
1412 | // We will wind up using a symbol whose name is the signature. |
1413 | // So just put the signature in the symbol name pool to save it. | |
1414 | signature = symtab->canonicalize_name(signature); | |
1415 | this->group_signatures_.push_back(Group_signature(os, signature)); | |
1416 | } | |
6a74a719 ILT |
1417 | |
1418 | os->set_should_link_to_symtab(); | |
6a74a719 ILT |
1419 | os->set_entsize(4); |
1420 | ||
1421 | section_size_type entry_count = | |
1422 | convert_to_section_size_type(shdr.get_sh_size() / 4); | |
1423 | Output_section_data* posd = | |
8825ac63 ILT |
1424 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
1425 | shndxes); | |
6a74a719 ILT |
1426 | os->add_output_section_data(posd); |
1427 | } | |
1428 | ||
730cdc88 ILT |
1429 | // Special GNU handling of sections name .eh_frame. They will |
1430 | // normally hold exception frame data as defined by the C++ ABI | |
1431 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
1432 | |
1433 | template<int size, bool big_endian> | |
730cdc88 | 1434 | Output_section* |
6fa2a40b | 1435 | Layout::layout_eh_frame(Sized_relobj_file<size, big_endian>* object, |
730cdc88 ILT |
1436 | const unsigned char* symbols, |
1437 | off_t symbols_size, | |
1438 | const unsigned char* symbol_names, | |
1439 | off_t symbol_names_size, | |
3151305a | 1440 | unsigned int shndx, |
3151305a | 1441 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
1442 | unsigned int reloc_shndx, unsigned int reloc_type, |
1443 | off_t* off) | |
3151305a | 1444 | { |
4d5e4e62 ILT |
1445 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS |
1446 | || shdr.get_sh_type() == elfcpp::SHT_X86_64_UNWIND); | |
1650c4ff | 1447 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 | 1448 | |
07a60597 | 1449 | Output_section* os = this->make_eh_frame_section(object); |
a445fddf ILT |
1450 | if (os == NULL) |
1451 | return NULL; | |
730cdc88 | 1452 | |
3151305a ILT |
1453 | gold_assert(this->eh_frame_section_ == os); |
1454 | ||
911a5072 ILT |
1455 | elfcpp::Elf_Xword orig_flags = os->flags(); |
1456 | ||
e1663197 CC |
1457 | Eh_frame::Eh_frame_section_disposition disp = |
1458 | Eh_frame::EH_UNRECOGNIZED_SECTION; | |
1459 | if (!parameters->incremental()) | |
1460 | { | |
1461 | disp = this->eh_frame_data_->add_ehframe_input_section(object, | |
1462 | symbols, | |
1463 | symbols_size, | |
1464 | symbol_names, | |
1465 | symbol_names_size, | |
1466 | shndx, | |
1467 | reloc_shndx, | |
1468 | reloc_type); | |
1469 | } | |
1470 | ||
1471 | if (disp == Eh_frame::EH_OPTIMIZABLE_SECTION) | |
2c38906f | 1472 | { |
154e0e9a ILT |
1473 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
1474 | ||
3bb951e5 | 1475 | // A writable .eh_frame section is a RELRO section. |
911a5072 ILT |
1476 | if ((orig_flags & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR)) |
1477 | != (os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR))) | |
1478 | { | |
1479 | os->set_is_relro(); | |
1480 | os->set_order(ORDER_RELRO); | |
1481 | } | |
3bb951e5 | 1482 | |
2c38906f | 1483 | *off = -1; |
e1663197 | 1484 | return os; |
2c38906f | 1485 | } |
e1663197 CC |
1486 | |
1487 | if (disp == Eh_frame::EH_END_MARKER_SECTION && !this->added_eh_frame_data_) | |
730cdc88 | 1488 | { |
e1663197 CC |
1489 | // We found the end marker section, so now we can add the set of |
1490 | // optimized sections to the output section. We need to postpone | |
1491 | // adding this until we've found a section we can optimize so that | |
1492 | // the .eh_frame section in crtbeginT.o winds up at the start of | |
1493 | // the output section. | |
1494 | os->add_output_section_data(this->eh_frame_data_); | |
1495 | this->added_eh_frame_data_ = true; | |
1496 | } | |
1497 | ||
1498 | // We couldn't handle this .eh_frame section for some reason. | |
1499 | // Add it as a normal section. | |
1500 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); | |
1501 | *off = os->add_input_section(this, object, shndx, ".eh_frame", shdr, | |
1502 | reloc_shndx, saw_sections_clause); | |
1503 | this->have_added_input_section_ = true; | |
911a5072 | 1504 | |
e1663197 CC |
1505 | if ((orig_flags & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR)) |
1506 | != (os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR))) | |
1507 | os->set_order(this->default_section_order(os, false)); | |
730cdc88 ILT |
1508 | |
1509 | return os; | |
3151305a ILT |
1510 | } |
1511 | ||
e1663197 CC |
1512 | void |
1513 | Layout::finalize_eh_frame_section() | |
1514 | { | |
1515 | // If we never found an end marker section, we need to add the | |
1516 | // optimized eh sections to the output section now. | |
1517 | if (!parameters->incremental() | |
1518 | && this->eh_frame_section_ != NULL | |
1519 | && !this->added_eh_frame_data_) | |
1520 | { | |
1521 | this->eh_frame_section_->add_output_section_data(this->eh_frame_data_); | |
1522 | this->added_eh_frame_data_ = true; | |
1523 | } | |
1524 | } | |
1525 | ||
07a60597 ILT |
1526 | // Create and return the magic .eh_frame section. Create |
1527 | // .eh_frame_hdr also if appropriate. OBJECT is the object with the | |
1528 | // input .eh_frame section; it may be NULL. | |
1529 | ||
1530 | Output_section* | |
1531 | Layout::make_eh_frame_section(const Relobj* object) | |
1532 | { | |
1533 | // FIXME: On x86_64, this could use SHT_X86_64_UNWIND rather than | |
1534 | // SHT_PROGBITS. | |
1535 | Output_section* os = this->choose_output_section(object, ".eh_frame", | |
1536 | elfcpp::SHT_PROGBITS, | |
1537 | elfcpp::SHF_ALLOC, false, | |
412ffd83 CC |
1538 | ORDER_EHFRAME, false, false, |
1539 | false); | |
07a60597 ILT |
1540 | if (os == NULL) |
1541 | return NULL; | |
1542 | ||
1543 | if (this->eh_frame_section_ == NULL) | |
1544 | { | |
1545 | this->eh_frame_section_ = os; | |
1546 | this->eh_frame_data_ = new Eh_frame(); | |
1547 | ||
1548 | // For incremental linking, we do not optimize .eh_frame sections | |
1549 | // or create a .eh_frame_hdr section. | |
1550 | if (parameters->options().eh_frame_hdr() && !parameters->incremental()) | |
1551 | { | |
1552 | Output_section* hdr_os = | |
1553 | this->choose_output_section(NULL, ".eh_frame_hdr", | |
1554 | elfcpp::SHT_PROGBITS, | |
1555 | elfcpp::SHF_ALLOC, false, | |
412ffd83 CC |
1556 | ORDER_EHFRAME, false, false, |
1557 | false); | |
07a60597 ILT |
1558 | |
1559 | if (hdr_os != NULL) | |
1560 | { | |
1561 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, | |
1562 | this->eh_frame_data_); | |
1563 | hdr_os->add_output_section_data(hdr_posd); | |
1564 | ||
1565 | hdr_os->set_after_input_sections(); | |
1566 | ||
1567 | if (!this->script_options_->saw_phdrs_clause()) | |
1568 | { | |
1569 | Output_segment* hdr_oseg; | |
1570 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, | |
1571 | elfcpp::PF_R); | |
1572 | hdr_oseg->add_output_section_to_nonload(hdr_os, | |
1573 | elfcpp::PF_R); | |
1574 | } | |
1575 | ||
1576 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); | |
1577 | } | |
1578 | } | |
1579 | } | |
1580 | ||
1581 | return os; | |
1582 | } | |
1583 | ||
1584 | // Add an exception frame for a PLT. This is called from target code. | |
1585 | ||
1586 | void | |
1587 | Layout::add_eh_frame_for_plt(Output_data* plt, const unsigned char* cie_data, | |
1588 | size_t cie_length, const unsigned char* fde_data, | |
1589 | size_t fde_length) | |
1590 | { | |
1591 | if (parameters->incremental()) | |
1592 | { | |
1593 | // FIXME: Maybe this could work some day.... | |
1594 | return; | |
1595 | } | |
1596 | Output_section* os = this->make_eh_frame_section(NULL); | |
1597 | if (os == NULL) | |
1598 | return; | |
1599 | this->eh_frame_data_->add_ehframe_for_plt(plt, cie_data, cie_length, | |
1600 | fde_data, fde_length); | |
1601 | if (!this->added_eh_frame_data_) | |
1602 | { | |
1603 | os->add_output_section_data(this->eh_frame_data_); | |
1604 | this->added_eh_frame_data_ = true; | |
1605 | } | |
1606 | } | |
1607 | ||
be897fb7 AM |
1608 | // Remove .eh_frame information for a PLT. FDEs using the CIE must |
1609 | // be removed in reverse order to the order they were added. | |
1610 | ||
1611 | void | |
1612 | Layout::remove_eh_frame_for_plt(Output_data* plt, const unsigned char* cie_data, | |
1613 | size_t cie_length, const unsigned char* fde_data, | |
1614 | size_t fde_length) | |
1615 | { | |
1616 | if (parameters->incremental()) | |
1617 | { | |
1618 | // FIXME: Maybe this could work some day.... | |
1619 | return; | |
1620 | } | |
1621 | this->eh_frame_data_->remove_ehframe_for_plt(plt, cie_data, cie_length, | |
1622 | fde_data, fde_length); | |
1623 | } | |
1624 | ||
c1027032 CC |
1625 | // Scan a .debug_info or .debug_types section, and add summary |
1626 | // information to the .gdb_index section. | |
1627 | ||
1628 | template<int size, bool big_endian> | |
1629 | void | |
1630 | Layout::add_to_gdb_index(bool is_type_unit, | |
1631 | Sized_relobj<size, big_endian>* object, | |
1632 | const unsigned char* symbols, | |
1633 | off_t symbols_size, | |
1634 | unsigned int shndx, | |
1635 | unsigned int reloc_shndx, | |
1636 | unsigned int reloc_type) | |
1637 | { | |
1638 | if (this->gdb_index_data_ == NULL) | |
1639 | { | |
1640 | Output_section* os = this->choose_output_section(NULL, ".gdb_index", | |
1641 | elfcpp::SHT_PROGBITS, 0, | |
1642 | false, ORDER_INVALID, | |
412ffd83 | 1643 | false, false, false); |
c1027032 | 1644 | if (os == NULL) |
2e702c99 | 1645 | return; |
c1027032 CC |
1646 | |
1647 | this->gdb_index_data_ = new Gdb_index(os); | |
1648 | os->add_output_section_data(this->gdb_index_data_); | |
1649 | os->set_after_input_sections(); | |
1650 | } | |
1651 | ||
1652 | this->gdb_index_data_->scan_debug_info(is_type_unit, object, symbols, | |
1653 | symbols_size, shndx, reloc_shndx, | |
1654 | reloc_type); | |
1655 | } | |
1656 | ||
9f1d377b ILT |
1657 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
1658 | // the output section. | |
ead1e424 | 1659 | |
9f1d377b | 1660 | Output_section* |
ead1e424 ILT |
1661 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
1662 | elfcpp::Elf_Xword flags, | |
f5c870d2 | 1663 | Output_section_data* posd, |
22f0da72 | 1664 | Output_section_order order, bool is_relro) |
ead1e424 | 1665 | { |
a445fddf | 1666 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
03fb64f8 | 1667 | false, order, is_relro, |
412ffd83 | 1668 | false, false); |
a445fddf ILT |
1669 | if (os != NULL) |
1670 | os->add_output_section_data(posd); | |
9f1d377b | 1671 | return os; |
ead1e424 ILT |
1672 | } |
1673 | ||
a2fb1b05 ILT |
1674 | // Map section flags to segment flags. |
1675 | ||
1676 | elfcpp::Elf_Word | |
1677 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
1678 | { | |
1679 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
1680 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
1681 | ret |= elfcpp::PF_W; | |
1682 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
1683 | ret |= elfcpp::PF_X; | |
1684 | return ret; | |
1685 | } | |
1686 | ||
1687 | // Make a new Output_section, and attach it to segments as | |
22f0da72 ILT |
1688 | // appropriate. ORDER is the order in which this section should |
1689 | // appear in the output segment. IS_RELRO is true if this is a relro | |
1690 | // (read-only after relocations) section. | |
a2fb1b05 ILT |
1691 | |
1692 | Output_section* | |
1693 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
22f0da72 ILT |
1694 | elfcpp::Elf_Xword flags, |
1695 | Output_section_order order, bool is_relro) | |
a2fb1b05 | 1696 | { |
96803768 ILT |
1697 | Output_section* os; |
1698 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 1699 | && strcmp(parameters->options().compress_debug_sections(), "none") != 0 |
96803768 | 1700 | && is_compressible_debug_section(name)) |
e55bde5e ILT |
1701 | os = new Output_compressed_section(¶meters->options(), name, type, |
1702 | flags); | |
62b01cb5 | 1703 | else if ((flags & elfcpp::SHF_ALLOC) == 0 |
2e702c99 RM |
1704 | && parameters->options().strip_debug_non_line() |
1705 | && strcmp(".debug_abbrev", name) == 0) | |
62b01cb5 ILT |
1706 | { |
1707 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( | |
2e702c99 | 1708 | name, type, flags); |
62b01cb5 | 1709 | if (this->debug_info_) |
2e702c99 | 1710 | this->debug_info_->set_abbreviations(this->debug_abbrev_); |
62b01cb5 ILT |
1711 | } |
1712 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
2e702c99 RM |
1713 | && parameters->options().strip_debug_non_line() |
1714 | && strcmp(".debug_info", name) == 0) | |
62b01cb5 ILT |
1715 | { |
1716 | os = this->debug_info_ = new Output_reduced_debug_info_section( | |
2e702c99 | 1717 | name, type, flags); |
62b01cb5 | 1718 | if (this->debug_abbrev_) |
2e702c99 | 1719 | this->debug_info_->set_abbreviations(this->debug_abbrev_); |
62b01cb5 | 1720 | } |
09ec0418 | 1721 | else |
c0a62865 | 1722 | { |
5393d741 ILT |
1723 | // Sometimes .init_array*, .preinit_array* and .fini_array* do |
1724 | // not have correct section types. Force them here. | |
1725 | if (type == elfcpp::SHT_PROGBITS) | |
1726 | { | |
1727 | if (is_prefix_of(".init_array", name)) | |
1728 | type = elfcpp::SHT_INIT_ARRAY; | |
1729 | else if (is_prefix_of(".preinit_array", name)) | |
1730 | type = elfcpp::SHT_PREINIT_ARRAY; | |
1731 | else if (is_prefix_of(".fini_array", name)) | |
1732 | type = elfcpp::SHT_FINI_ARRAY; | |
1733 | } | |
1734 | ||
c0a62865 DK |
1735 | // FIXME: const_cast is ugly. |
1736 | Target* target = const_cast<Target*>(¶meters->target()); | |
1737 | os = target->make_output_section(name, type, flags); | |
1738 | } | |
96803768 | 1739 | |
22f0da72 ILT |
1740 | // With -z relro, we have to recognize the special sections by name. |
1741 | // There is no other way. | |
1742 | bool is_relro_local = false; | |
1743 | if (!this->script_options_->saw_sections_clause() | |
1744 | && parameters->options().relro() | |
22f0da72 ILT |
1745 | && (flags & elfcpp::SHF_ALLOC) != 0 |
1746 | && (flags & elfcpp::SHF_WRITE) != 0) | |
1747 | { | |
14dc9ef7 | 1748 | if (type == elfcpp::SHT_PROGBITS) |
22f0da72 | 1749 | { |
1007b503 CC |
1750 | if ((flags & elfcpp::SHF_TLS) != 0) |
1751 | is_relro = true; | |
1752 | else if (strcmp(name, ".data.rel.ro") == 0) | |
14dc9ef7 ILT |
1753 | is_relro = true; |
1754 | else if (strcmp(name, ".data.rel.ro.local") == 0) | |
1755 | { | |
1756 | is_relro = true; | |
1757 | is_relro_local = true; | |
1758 | } | |
1759 | else if (strcmp(name, ".ctors") == 0 | |
1760 | || strcmp(name, ".dtors") == 0 | |
1761 | || strcmp(name, ".jcr") == 0) | |
1762 | is_relro = true; | |
22f0da72 ILT |
1763 | } |
1764 | else if (type == elfcpp::SHT_INIT_ARRAY | |
1765 | || type == elfcpp::SHT_FINI_ARRAY | |
1766 | || type == elfcpp::SHT_PREINIT_ARRAY) | |
1767 | is_relro = true; | |
22f0da72 ILT |
1768 | } |
1769 | ||
1a2dff53 ILT |
1770 | if (is_relro) |
1771 | os->set_is_relro(); | |
22f0da72 ILT |
1772 | |
1773 | if (order == ORDER_INVALID && (flags & elfcpp::SHF_ALLOC) != 0) | |
1774 | order = this->default_section_order(os, is_relro_local); | |
1775 | ||
1776 | os->set_order(order); | |
f5c870d2 | 1777 | |
8a5e3e08 ILT |
1778 | parameters->target().new_output_section(os); |
1779 | ||
a3ad94ed | 1780 | this->section_list_.push_back(os); |
a2fb1b05 | 1781 | |
2fd32231 ILT |
1782 | // The GNU linker by default sorts some sections by priority, so we |
1783 | // do the same. We need to know that this might happen before we | |
1784 | // attach any input sections. | |
1785 | if (!this->script_options_->saw_sections_clause() | |
5393d741 ILT |
1786 | && !parameters->options().relocatable() |
1787 | && (strcmp(name, ".init_array") == 0 | |
1788 | || strcmp(name, ".fini_array") == 0 | |
1789 | || (!parameters->options().ctors_in_init_array() | |
1790 | && (strcmp(name, ".ctors") == 0 | |
1791 | || strcmp(name, ".dtors") == 0)))) | |
2fd32231 ILT |
1792 | os->set_may_sort_attached_input_sections(); |
1793 | ||
edcac0c1 ILT |
1794 | // The GNU linker by default sorts .text.{unlikely,exit,startup,hot} |
1795 | // sections before other .text sections. We are compatible. We | |
1796 | // need to know that this might happen before we attach any input | |
1797 | // sections. | |
c6ac678d ST |
1798 | if (parameters->options().text_reorder() |
1799 | && !this->script_options_->saw_sections_clause() | |
7c381248 | 1800 | && !this->is_section_ordering_specified() |
edcac0c1 ILT |
1801 | && !parameters->options().relocatable() |
1802 | && strcmp(name, ".text") == 0) | |
1803 | os->set_may_sort_attached_input_sections(); | |
1804 | ||
6934001a CC |
1805 | // GNU linker sorts section by name with --sort-section=name. |
1806 | if (strcmp(parameters->options().sort_section(), "name") == 0) | |
1807 | os->set_must_sort_attached_input_sections(); | |
1808 | ||
1518dc8f ILT |
1809 | // Check for .stab*str sections, as .stab* sections need to link to |
1810 | // them. | |
1811 | if (type == elfcpp::SHT_STRTAB | |
1812 | && !this->have_stabstr_section_ | |
1813 | && strncmp(name, ".stab", 5) == 0 | |
1814 | && strcmp(name + strlen(name) - 3, "str") == 0) | |
1815 | this->have_stabstr_section_ = true; | |
1816 | ||
9fbd3822 CC |
1817 | // During a full incremental link, we add patch space to most |
1818 | // PROGBITS and NOBITS sections. Flag those that may be | |
1819 | // arbitrarily padded. | |
1820 | if ((type == elfcpp::SHT_PROGBITS || type == elfcpp::SHT_NOBITS) | |
1821 | && order != ORDER_INTERP | |
1822 | && order != ORDER_INIT | |
1823 | && order != ORDER_PLT | |
1824 | && order != ORDER_FINI | |
1825 | && order != ORDER_RELRO_LAST | |
1826 | && order != ORDER_NON_RELRO_FIRST | |
aa06ae28 | 1827 | && strcmp(name, ".eh_frame") != 0 |
9fbd3822 CC |
1828 | && strcmp(name, ".ctors") != 0 |
1829 | && strcmp(name, ".dtors") != 0 | |
1830 | && strcmp(name, ".jcr") != 0) | |
8ea8cd50 CC |
1831 | { |
1832 | os->set_is_patch_space_allowed(); | |
1833 | ||
1834 | // Certain sections require "holes" to be filled with | |
1835 | // specific fill patterns. These fill patterns may have | |
1836 | // a minimum size, so we must prevent allocations from the | |
1837 | // free list that leave a hole smaller than the minimum. | |
1838 | if (strcmp(name, ".debug_info") == 0) | |
2e702c99 | 1839 | os->set_free_space_fill(new Output_fill_debug_info(false)); |
8ea8cd50 | 1840 | else if (strcmp(name, ".debug_types") == 0) |
2e702c99 | 1841 | os->set_free_space_fill(new Output_fill_debug_info(true)); |
8ea8cd50 | 1842 | else if (strcmp(name, ".debug_line") == 0) |
2e702c99 | 1843 | os->set_free_space_fill(new Output_fill_debug_line()); |
8ea8cd50 | 1844 | } |
9fbd3822 | 1845 | |
154e0e9a ILT |
1846 | // If we have already attached the sections to segments, then we |
1847 | // need to attach this one now. This happens for sections created | |
1848 | // directly by the linker. | |
1849 | if (this->sections_are_attached_) | |
2e702c99 | 1850 | this->attach_section_to_segment(¶meters->target(), os); |
154e0e9a | 1851 | |
4e2b1697 ILT |
1852 | return os; |
1853 | } | |
a445fddf | 1854 | |
22f0da72 ILT |
1855 | // Return the default order in which a section should be placed in an |
1856 | // output segment. This function captures a lot of the ideas in | |
1857 | // ld/scripttempl/elf.sc in the GNU linker. Note that the order of a | |
1858 | // linker created section is normally set when the section is created; | |
1859 | // this function is used for input sections. | |
1860 | ||
1861 | Output_section_order | |
1862 | Layout::default_section_order(Output_section* os, bool is_relro_local) | |
1863 | { | |
1864 | gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0); | |
1865 | bool is_write = (os->flags() & elfcpp::SHF_WRITE) != 0; | |
1866 | bool is_execinstr = (os->flags() & elfcpp::SHF_EXECINSTR) != 0; | |
1867 | bool is_bss = false; | |
1868 | ||
1869 | switch (os->type()) | |
1870 | { | |
1871 | default: | |
1872 | case elfcpp::SHT_PROGBITS: | |
1873 | break; | |
1874 | case elfcpp::SHT_NOBITS: | |
1875 | is_bss = true; | |
1876 | break; | |
1877 | case elfcpp::SHT_RELA: | |
1878 | case elfcpp::SHT_REL: | |
1879 | if (!is_write) | |
1880 | return ORDER_DYNAMIC_RELOCS; | |
1881 | break; | |
1882 | case elfcpp::SHT_HASH: | |
1883 | case elfcpp::SHT_DYNAMIC: | |
1884 | case elfcpp::SHT_SHLIB: | |
1885 | case elfcpp::SHT_DYNSYM: | |
1886 | case elfcpp::SHT_GNU_HASH: | |
1887 | case elfcpp::SHT_GNU_verdef: | |
1888 | case elfcpp::SHT_GNU_verneed: | |
1889 | case elfcpp::SHT_GNU_versym: | |
1890 | if (!is_write) | |
1891 | return ORDER_DYNAMIC_LINKER; | |
1892 | break; | |
1893 | case elfcpp::SHT_NOTE: | |
1894 | return is_write ? ORDER_RW_NOTE : ORDER_RO_NOTE; | |
1895 | } | |
1896 | ||
1897 | if ((os->flags() & elfcpp::SHF_TLS) != 0) | |
1898 | return is_bss ? ORDER_TLS_BSS : ORDER_TLS_DATA; | |
1899 | ||
1900 | if (!is_bss && !is_write) | |
1901 | { | |
1902 | if (is_execinstr) | |
1903 | { | |
1904 | if (strcmp(os->name(), ".init") == 0) | |
1905 | return ORDER_INIT; | |
1906 | else if (strcmp(os->name(), ".fini") == 0) | |
1907 | return ORDER_FINI; | |
779bdadb ST |
1908 | else if (parameters->options().keep_text_section_prefix()) |
1909 | { | |
1910 | // -z,keep-text-section-prefix introduces additional | |
1911 | // output sections. | |
1912 | if (strcmp(os->name(), ".text.hot") == 0) | |
1913 | return ORDER_TEXT_HOT; | |
1914 | else if (strcmp(os->name(), ".text.startup") == 0) | |
1915 | return ORDER_TEXT_STARTUP; | |
1916 | else if (strcmp(os->name(), ".text.exit") == 0) | |
1917 | return ORDER_TEXT_EXIT; | |
1918 | else if (strcmp(os->name(), ".text.unlikely") == 0) | |
1919 | return ORDER_TEXT_UNLIKELY; | |
1920 | } | |
22f0da72 ILT |
1921 | } |
1922 | return is_execinstr ? ORDER_TEXT : ORDER_READONLY; | |
1923 | } | |
1924 | ||
1925 | if (os->is_relro()) | |
1926 | return is_relro_local ? ORDER_RELRO_LOCAL : ORDER_RELRO; | |
1927 | ||
1928 | if (os->is_small_section()) | |
1929 | return is_bss ? ORDER_SMALL_BSS : ORDER_SMALL_DATA; | |
1930 | if (os->is_large_section()) | |
1931 | return is_bss ? ORDER_LARGE_BSS : ORDER_LARGE_DATA; | |
1932 | ||
1933 | return is_bss ? ORDER_BSS : ORDER_DATA; | |
1934 | } | |
1935 | ||
154e0e9a ILT |
1936 | // Attach output sections to segments. This is called after we have |
1937 | // seen all the input sections. | |
1938 | ||
1939 | void | |
2e702c99 | 1940 | Layout::attach_sections_to_segments(const Target* target) |
154e0e9a ILT |
1941 | { |
1942 | for (Section_list::iterator p = this->section_list_.begin(); | |
1943 | p != this->section_list_.end(); | |
1944 | ++p) | |
2e702c99 | 1945 | this->attach_section_to_segment(target, *p); |
154e0e9a ILT |
1946 | |
1947 | this->sections_are_attached_ = true; | |
1948 | } | |
1949 | ||
1950 | // Attach an output section to a segment. | |
1951 | ||
1952 | void | |
2e702c99 | 1953 | Layout::attach_section_to_segment(const Target* target, Output_section* os) |
154e0e9a ILT |
1954 | { |
1955 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
1956 | this->unattached_section_list_.push_back(os); | |
1957 | else | |
2e702c99 | 1958 | this->attach_allocated_section_to_segment(target, os); |
154e0e9a ILT |
1959 | } |
1960 | ||
4e2b1697 | 1961 | // Attach an allocated output section to a segment. |
1c4f3631 | 1962 | |
4e2b1697 | 1963 | void |
2e702c99 RM |
1964 | Layout::attach_allocated_section_to_segment(const Target* target, |
1965 | Output_section* os) | |
4e2b1697 | 1966 | { |
154e0e9a | 1967 | elfcpp::Elf_Xword flags = os->flags(); |
4e2b1697 | 1968 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
a2fb1b05 | 1969 | |
4e2b1697 ILT |
1970 | if (parameters->options().relocatable()) |
1971 | return; | |
a2fb1b05 | 1972 | |
4e2b1697 ILT |
1973 | // If we have a SECTIONS clause, we can't handle the attachment to |
1974 | // segments until after we've seen all the sections. | |
1975 | if (this->script_options_->saw_sections_clause()) | |
1976 | return; | |
a2fb1b05 | 1977 | |
4e2b1697 | 1978 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
756ac4a8 | 1979 | |
4e2b1697 | 1980 | // This output section goes into a PT_LOAD segment. |
a2fb1b05 | 1981 | |
4e2b1697 | 1982 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
a2fb1b05 | 1983 | |
16164a6b ST |
1984 | // If this output section's segment has extra flags that need to be set, |
1985 | // coming from a linker plugin, do that. | |
1986 | seg_flags |= os->extra_segment_flags(); | |
1987 | ||
a192ba05 ILT |
1988 | // Check for --section-start. |
1989 | uint64_t addr; | |
1990 | bool is_address_set = parameters->options().section_start(os->name(), &addr); | |
f5c870d2 | 1991 | |
4e2b1697 | 1992 | // In general the only thing we really care about for PT_LOAD |
0f72bf6f RÁE |
1993 | // segments is whether or not they are writable or executable, |
1994 | // so that is how we search for them. | |
1995 | // Large data sections also go into their own PT_LOAD segment. | |
1996 | // People who need segments sorted on some other basis will | |
1997 | // have to use a linker script. | |
a2fb1b05 | 1998 | |
4e2b1697 | 1999 | Segment_list::const_iterator p; |
16164a6b | 2000 | if (!os->is_unique_segment()) |
4e2b1697 | 2001 | { |
16164a6b | 2002 | for (p = this->segment_list_.begin(); |
bbc5ae17 | 2003 | p != this->segment_list_.end(); |
16164a6b | 2004 | ++p) |
a192ba05 | 2005 | { |
bbc5ae17 RM |
2006 | if ((*p)->type() != elfcpp::PT_LOAD) |
2007 | continue; | |
2008 | if ((*p)->is_unique_segment()) | |
2009 | continue; | |
2010 | if (!parameters->options().omagic() | |
2011 | && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W)) | |
2012 | continue; | |
2013 | if ((target->isolate_execinstr() || parameters->options().rosegment()) | |
2014 | && ((*p)->flags() & elfcpp::PF_X) != (seg_flags & elfcpp::PF_X)) | |
2015 | continue; | |
2016 | // If -Tbss was specified, we need to separate the data and BSS | |
2017 | // segments. | |
2018 | if (parameters->options().user_set_Tbss()) | |
2019 | { | |
2020 | if ((os->type() == elfcpp::SHT_NOBITS) | |
2021 | == (*p)->has_any_data_sections()) | |
2022 | continue; | |
2023 | } | |
2024 | if (os->is_large_data_section() && !(*p)->is_large_data_segment()) | |
2025 | continue; | |
2026 | ||
2027 | if (is_address_set) | |
2028 | { | |
2029 | if ((*p)->are_addresses_set()) | |
2030 | continue; | |
2031 | ||
2032 | (*p)->add_initial_output_data(os); | |
2033 | (*p)->update_flags_for_output_section(seg_flags); | |
2034 | (*p)->set_addresses(addr, addr); | |
2035 | break; | |
2036 | } | |
2037 | ||
2038 | (*p)->add_output_section_to_load(this, os, seg_flags); | |
2039 | break; | |
2040 | } | |
16164a6b ST |
2041 | } |
2042 | ||
2043 | if (p == this->segment_list_.end() | |
2044 | || os->is_unique_segment()) | |
4e2b1697 ILT |
2045 | { |
2046 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, | |
2e702c99 | 2047 | seg_flags); |
8a5e3e08 ILT |
2048 | if (os->is_large_data_section()) |
2049 | oseg->set_is_large_data_segment(); | |
22f0da72 | 2050 | oseg->add_output_section_to_load(this, os, seg_flags); |
a192ba05 ILT |
2051 | if (is_address_set) |
2052 | oseg->set_addresses(addr, addr); | |
16164a6b ST |
2053 | // Check if segment should be marked unique. For segments marked |
2054 | // unique by linker plugins, set the new alignment if specified. | |
2055 | if (os->is_unique_segment()) | |
2056 | { | |
2057 | oseg->set_is_unique_segment(); | |
2058 | if (os->segment_alignment() != 0) | |
2059 | oseg->set_minimum_p_align(os->segment_alignment()); | |
2060 | } | |
a2fb1b05 ILT |
2061 | } |
2062 | ||
4e2b1697 ILT |
2063 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
2064 | // segment. | |
2065 | if (os->type() == elfcpp::SHT_NOTE) | |
2066 | { | |
2067 | // See if we already have an equivalent PT_NOTE segment. | |
2068 | for (p = this->segment_list_.begin(); | |
2e702c99 RM |
2069 | p != segment_list_.end(); |
2070 | ++p) | |
2071 | { | |
2072 | if ((*p)->type() == elfcpp::PT_NOTE | |
2073 | && (((*p)->flags() & elfcpp::PF_W) | |
2074 | == (seg_flags & elfcpp::PF_W))) | |
2075 | { | |
2076 | (*p)->add_output_section_to_nonload(os, seg_flags); | |
2077 | break; | |
2078 | } | |
2079 | } | |
4e2b1697 ILT |
2080 | |
2081 | if (p == this->segment_list_.end()) | |
2e702c99 RM |
2082 | { |
2083 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, | |
2084 | seg_flags); | |
2085 | oseg->add_output_section_to_nonload(os, seg_flags); | |
2086 | } | |
4e2b1697 ILT |
2087 | } |
2088 | ||
2089 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
2090 | // segment. There can only be one such segment. | |
2091 | if ((flags & elfcpp::SHF_TLS) != 0) | |
2092 | { | |
2093 | if (this->tls_segment_ == NULL) | |
2d924fd9 | 2094 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
22f0da72 | 2095 | this->tls_segment_->add_output_section_to_nonload(os, seg_flags); |
4e2b1697 | 2096 | } |
9f1d377b ILT |
2097 | |
2098 | // If -z relro is in effect, and we see a relro section, we create a | |
2099 | // PT_GNU_RELRO segment. There can only be one such segment. | |
2100 | if (os->is_relro() && parameters->options().relro()) | |
2101 | { | |
2102 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); | |
2103 | if (this->relro_segment_ == NULL) | |
2d924fd9 | 2104 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
22f0da72 | 2105 | this->relro_segment_->add_output_section_to_nonload(os, seg_flags); |
9f1d377b | 2106 | } |
10b4f102 | 2107 | |
e1f74f98 ILT |
2108 | // If we see a section named .interp, put it into a PT_INTERP |
2109 | // segment. This seems broken to me, but this is what GNU ld does, | |
2110 | // and glibc expects it. | |
10b4f102 | 2111 | if (strcmp(os->name(), ".interp") == 0 |
e1f74f98 | 2112 | && !this->script_options_->saw_phdrs_clause()) |
10b4f102 ILT |
2113 | { |
2114 | if (this->interp_segment_ == NULL) | |
2115 | this->make_output_segment(elfcpp::PT_INTERP, seg_flags); | |
e1f74f98 ILT |
2116 | else |
2117 | gold_warning(_("multiple '.interp' sections in input files " | |
2118 | "may cause confusing PT_INTERP segment")); | |
10b4f102 ILT |
2119 | this->interp_segment_->add_output_section_to_nonload(os, seg_flags); |
2120 | } | |
a2fb1b05 ILT |
2121 | } |
2122 | ||
919ed24c ILT |
2123 | // Make an output section for a script. |
2124 | ||
2125 | Output_section* | |
1e5d2fb1 DK |
2126 | Layout::make_output_section_for_script( |
2127 | const char* name, | |
2128 | Script_sections::Section_type section_type) | |
919ed24c ILT |
2129 | { |
2130 | name = this->namepool_.add(name, false, NULL); | |
1e5d2fb1 DK |
2131 | elfcpp::Elf_Xword sh_flags = elfcpp::SHF_ALLOC; |
2132 | if (section_type == Script_sections::ST_NOLOAD) | |
2133 | sh_flags = 0; | |
919ed24c | 2134 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, |
22f0da72 ILT |
2135 | sh_flags, ORDER_INVALID, |
2136 | false); | |
919ed24c | 2137 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
2138 | if (section_type == Script_sections::ST_NOLOAD) |
2139 | os->set_is_noload(); | |
919ed24c ILT |
2140 | return os; |
2141 | } | |
2142 | ||
3802b2dd ILT |
2143 | // Return the number of segments we expect to see. |
2144 | ||
2145 | size_t | |
2146 | Layout::expected_segment_count() const | |
2147 | { | |
2148 | size_t ret = this->segment_list_.size(); | |
2149 | ||
2150 | // If we didn't see a SECTIONS clause in a linker script, we should | |
2151 | // already have the complete list of segments. Otherwise we ask the | |
2152 | // SECTIONS clause how many segments it expects, and add in the ones | |
2153 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) | |
2154 | ||
2155 | if (!this->script_options_->saw_sections_clause()) | |
2156 | return ret; | |
2157 | else | |
2158 | { | |
2159 | const Script_sections* ss = this->script_options_->script_sections(); | |
2160 | return ret + ss->expected_segment_count(this); | |
2161 | } | |
2162 | } | |
2163 | ||
35cdfc9a ILT |
2164 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
2165 | // is whether we saw a .note.GNU-stack section in the object file. | |
2166 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
2167 | // protection required for stack memory. We record this in an | |
2168 | // executable as a PT_GNU_STACK segment. If an object file does not | |
2169 | // have a .note.GNU-stack segment, we must assume that it is an old | |
2170 | // object. On some targets that will force an executable stack. | |
2171 | ||
2172 | void | |
83e17bd5 CC |
2173 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags, |
2174 | const Object* obj) | |
35cdfc9a ILT |
2175 | { |
2176 | if (!seen_gnu_stack) | |
83e17bd5 CC |
2177 | { |
2178 | this->input_without_gnu_stack_note_ = true; | |
2179 | if (parameters->options().warn_execstack() | |
2180 | && parameters->target().is_default_stack_executable()) | |
2181 | gold_warning(_("%s: missing .note.GNU-stack section" | |
2182 | " implies executable stack"), | |
2183 | obj->name().c_str()); | |
2184 | } | |
35cdfc9a ILT |
2185 | else |
2186 | { | |
2187 | this->input_with_gnu_stack_note_ = true; | |
2188 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
83e17bd5 CC |
2189 | { |
2190 | this->input_requires_executable_stack_ = true; | |
d8e60314 | 2191 | if (parameters->options().warn_execstack()) |
83e17bd5 CC |
2192 | gold_warning(_("%s: requires executable stack"), |
2193 | obj->name().c_str()); | |
2194 | } | |
35cdfc9a ILT |
2195 | } |
2196 | } | |
2197 | ||
9c547ec3 ILT |
2198 | // Create automatic note sections. |
2199 | ||
2200 | void | |
2201 | Layout::create_notes() | |
2202 | { | |
2203 | this->create_gold_note(); | |
1130c90e | 2204 | this->create_stack_segment(); |
9c547ec3 ILT |
2205 | this->create_build_id(); |
2206 | } | |
2207 | ||
a3ad94ed ILT |
2208 | // Create the dynamic sections which are needed before we read the |
2209 | // relocs. | |
2210 | ||
2211 | void | |
9b07f471 | 2212 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
a3ad94ed | 2213 | { |
436ca963 | 2214 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
2215 | return; |
2216 | ||
3802b2dd ILT |
2217 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
2218 | elfcpp::SHT_DYNAMIC, | |
2219 | (elfcpp::SHF_ALLOC | |
2220 | | elfcpp::SHF_WRITE), | |
22f0da72 | 2221 | false, ORDER_RELRO, |
412ffd83 | 2222 | true, false, false); |
a3ad94ed | 2223 | |
6daf5215 ILT |
2224 | // A linker script may discard .dynamic, so check for NULL. |
2225 | if (this->dynamic_section_ != NULL) | |
2226 | { | |
2227 | this->dynamic_symbol_ = | |
2228 | symtab->define_in_output_data("_DYNAMIC", NULL, | |
2229 | Symbol_table::PREDEFINED, | |
2230 | this->dynamic_section_, 0, 0, | |
2231 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, | |
2232 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 2233 | |
6daf5215 | 2234 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 | 2235 | |
6daf5215 ILT |
2236 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); |
2237 | } | |
a3ad94ed ILT |
2238 | } |
2239 | ||
bfd58944 ILT |
2240 | // For each output section whose name can be represented as C symbol, |
2241 | // define __start and __stop symbols for the section. This is a GNU | |
2242 | // extension. | |
2243 | ||
2244 | void | |
9b07f471 | 2245 | Layout::define_section_symbols(Symbol_table* symtab) |
bfd58944 ILT |
2246 | { |
2247 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
2248 | p != this->section_list_.end(); | |
2249 | ++p) | |
2250 | { | |
2251 | const char* const name = (*p)->name(); | |
f1ec9ded | 2252 | if (is_cident(name)) |
bfd58944 ILT |
2253 | { |
2254 | const std::string name_string(name); | |
f1ec9ded | 2255 | const std::string start_name(cident_section_start_prefix |
2e702c99 | 2256 | + name_string); |
f1ec9ded | 2257 | const std::string stop_name(cident_section_stop_prefix |
2e702c99 | 2258 | + name_string); |
bfd58944 | 2259 | |
9b07f471 | 2260 | symtab->define_in_output_data(start_name.c_str(), |
bfd58944 | 2261 | NULL, // version |
99fff23b | 2262 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
2263 | *p, |
2264 | 0, // value | |
2265 | 0, // symsize | |
2266 | elfcpp::STT_NOTYPE, | |
2267 | elfcpp::STB_GLOBAL, | |
dc8d2d90 | 2268 | elfcpp::STV_PROTECTED, |
bfd58944 ILT |
2269 | 0, // nonvis |
2270 | false, // offset_is_from_end | |
a445fddf | 2271 | true); // only_if_ref |
bfd58944 | 2272 | |
9b07f471 | 2273 | symtab->define_in_output_data(stop_name.c_str(), |
bfd58944 | 2274 | NULL, // version |
99fff23b | 2275 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
2276 | *p, |
2277 | 0, // value | |
2278 | 0, // symsize | |
2279 | elfcpp::STT_NOTYPE, | |
2280 | elfcpp::STB_GLOBAL, | |
dc8d2d90 | 2281 | elfcpp::STV_PROTECTED, |
bfd58944 ILT |
2282 | 0, // nonvis |
2283 | true, // offset_is_from_end | |
a445fddf | 2284 | true); // only_if_ref |
bfd58944 ILT |
2285 | } |
2286 | } | |
2287 | } | |
2288 | ||
755ab8af ILT |
2289 | // Define symbols for group signatures. |
2290 | ||
2291 | void | |
2292 | Layout::define_group_signatures(Symbol_table* symtab) | |
2293 | { | |
2294 | for (Group_signatures::iterator p = this->group_signatures_.begin(); | |
2295 | p != this->group_signatures_.end(); | |
2296 | ++p) | |
2297 | { | |
2298 | Symbol* sym = symtab->lookup(p->signature, NULL); | |
2299 | if (sym != NULL) | |
2300 | p->section->set_info_symndx(sym); | |
2301 | else | |
2302 | { | |
2303 | // Force the name of the group section to the group | |
2304 | // signature, and use the group's section symbol as the | |
2305 | // signature symbol. | |
2306 | if (strcmp(p->section->name(), p->signature) != 0) | |
2307 | { | |
2308 | const char* name = this->namepool_.add(p->signature, | |
2309 | true, NULL); | |
2310 | p->section->set_name(name); | |
2311 | } | |
2312 | p->section->set_needs_symtab_index(); | |
2313 | p->section->set_info_section_symndx(p->section); | |
2314 | } | |
2315 | } | |
2316 | ||
2317 | this->group_signatures_.clear(); | |
2318 | } | |
2319 | ||
75f65a3e ILT |
2320 | // Find the first read-only PT_LOAD segment, creating one if |
2321 | // necessary. | |
54dc6425 | 2322 | |
75f65a3e | 2323 | Output_segment* |
2e702c99 | 2324 | Layout::find_first_load_seg(const Target* target) |
54dc6425 | 2325 | { |
0f72bf6f | 2326 | Output_segment* best = NULL; |
75f65a3e ILT |
2327 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
2328 | p != this->segment_list_.end(); | |
2329 | ++p) | |
2330 | { | |
2331 | if ((*p)->type() == elfcpp::PT_LOAD | |
2332 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
af6156ef | 2333 | && (parameters->options().omagic() |
2e702c99 RM |
2334 | || ((*p)->flags() & elfcpp::PF_W) == 0) |
2335 | && (!target->isolate_execinstr() | |
2336 | || ((*p)->flags() & elfcpp::PF_X) == 0)) | |
2337 | { | |
2338 | if (best == NULL || this->segment_precedes(*p, best)) | |
2339 | best = *p; | |
2340 | } | |
75f65a3e | 2341 | } |
0f72bf6f RÁE |
2342 | if (best != NULL) |
2343 | return best; | |
75f65a3e | 2344 | |
1c4f3631 ILT |
2345 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
2346 | ||
3802b2dd ILT |
2347 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
2348 | elfcpp::PF_R); | |
75f65a3e | 2349 | return load_seg; |
54dc6425 ILT |
2350 | } |
2351 | ||
20e6d0d6 DK |
2352 | // Save states of all current output segments. Store saved states |
2353 | // in SEGMENT_STATES. | |
2354 | ||
2355 | void | |
2356 | Layout::save_segments(Segment_states* segment_states) | |
2357 | { | |
2358 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
2359 | p != this->segment_list_.end(); | |
2360 | ++p) | |
2361 | { | |
2362 | Output_segment* segment = *p; | |
2363 | // Shallow copy. | |
2364 | Output_segment* copy = new Output_segment(*segment); | |
2365 | (*segment_states)[segment] = copy; | |
2366 | } | |
2367 | } | |
2368 | ||
2369 | // Restore states of output segments and delete any segment not found in | |
2370 | // SEGMENT_STATES. | |
2371 | ||
2372 | void | |
2373 | Layout::restore_segments(const Segment_states* segment_states) | |
2374 | { | |
2375 | // Go through the segment list and remove any segment added in the | |
2376 | // relaxation loop. | |
2377 | this->tls_segment_ = NULL; | |
2378 | this->relro_segment_ = NULL; | |
2379 | Segment_list::iterator list_iter = this->segment_list_.begin(); | |
2380 | while (list_iter != this->segment_list_.end()) | |
2381 | { | |
2382 | Output_segment* segment = *list_iter; | |
2383 | Segment_states::const_iterator states_iter = | |
2384 | segment_states->find(segment); | |
2385 | if (states_iter != segment_states->end()) | |
2386 | { | |
2387 | const Output_segment* copy = states_iter->second; | |
2388 | // Shallow copy to restore states. | |
2389 | *segment = *copy; | |
2390 | ||
2391 | // Also fix up TLS and RELRO segment pointers as appropriate. | |
2392 | if (segment->type() == elfcpp::PT_TLS) | |
2393 | this->tls_segment_ = segment; | |
2394 | else if (segment->type() == elfcpp::PT_GNU_RELRO) | |
2395 | this->relro_segment_ = segment; | |
2396 | ||
2397 | ++list_iter; | |
2e702c99 | 2398 | } |
20e6d0d6 DK |
2399 | else |
2400 | { | |
2e702c99 | 2401 | list_iter = this->segment_list_.erase(list_iter); |
20e6d0d6 DK |
2402 | // This is a segment created during section layout. It should be |
2403 | // safe to remove it since we should have removed all pointers to it. | |
2404 | delete segment; | |
2405 | } | |
2406 | } | |
2407 | } | |
2408 | ||
2409 | // Clean up after relaxation so that sections can be laid out again. | |
2410 | ||
2411 | void | |
2412 | Layout::clean_up_after_relaxation() | |
2413 | { | |
2414 | // Restore the segments to point state just prior to the relaxation loop. | |
2415 | Script_sections* script_section = this->script_options_->script_sections(); | |
2416 | script_section->release_segments(); | |
2417 | this->restore_segments(this->segment_states_); | |
2418 | ||
2419 | // Reset section addresses and file offsets | |
2420 | for (Section_list::iterator p = this->section_list_.begin(); | |
2421 | p != this->section_list_.end(); | |
2422 | ++p) | |
2423 | { | |
20e6d0d6 | 2424 | (*p)->restore_states(); |
8923b24c DK |
2425 | |
2426 | // If an input section changes size because of relaxation, | |
2427 | // we need to adjust the section offsets of all input sections. | |
2428 | // after such a section. | |
2429 | if ((*p)->section_offsets_need_adjustment()) | |
2430 | (*p)->adjust_section_offsets(); | |
2431 | ||
2432 | (*p)->reset_address_and_file_offset(); | |
20e6d0d6 | 2433 | } |
2e702c99 | 2434 | |
20e6d0d6 DK |
2435 | // Reset special output object address and file offsets. |
2436 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
2437 | p != this->special_output_list_.end(); | |
2438 | ++p) | |
2439 | (*p)->reset_address_and_file_offset(); | |
2440 | ||
2441 | // A linker script may have created some output section data objects. | |
2442 | // They are useless now. | |
2443 | for (Output_section_data_list::const_iterator p = | |
2444 | this->script_output_section_data_list_.begin(); | |
2445 | p != this->script_output_section_data_list_.end(); | |
2446 | ++p) | |
2447 | delete *p; | |
2e702c99 | 2448 | this->script_output_section_data_list_.clear(); |
eb426534 RM |
2449 | |
2450 | // Special-case fill output objects are recreated each time through | |
2451 | // the relaxation loop. | |
2452 | this->reset_relax_output(); | |
2453 | } | |
2454 | ||
2455 | void | |
2456 | Layout::reset_relax_output() | |
2457 | { | |
2458 | for (Data_list::const_iterator p = this->relax_output_list_.begin(); | |
2459 | p != this->relax_output_list_.end(); | |
2460 | ++p) | |
2461 | delete *p; | |
2462 | this->relax_output_list_.clear(); | |
20e6d0d6 DK |
2463 | } |
2464 | ||
2465 | // Prepare for relaxation. | |
2466 | ||
2467 | void | |
2468 | Layout::prepare_for_relaxation() | |
2469 | { | |
2470 | // Create an relaxation debug check if in debugging mode. | |
2471 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2472 | this->relaxation_debug_check_ = new Relaxation_debug_check(); | |
2473 | ||
2474 | // Save segment states. | |
2475 | this->segment_states_ = new Segment_states(); | |
2476 | this->save_segments(this->segment_states_); | |
2477 | ||
2478 | for(Section_list::const_iterator p = this->section_list_.begin(); | |
2479 | p != this->section_list_.end(); | |
2480 | ++p) | |
2481 | (*p)->save_states(); | |
2482 | ||
2483 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2484 | this->relaxation_debug_check_->check_output_data_for_reset_values( | |
eb426534 RM |
2485 | this->section_list_, this->special_output_list_, |
2486 | this->relax_output_list_); | |
20e6d0d6 DK |
2487 | |
2488 | // Also enable recording of output section data from scripts. | |
2489 | this->record_output_section_data_from_script_ = true; | |
2490 | } | |
2491 | ||
a3ed37d8 RM |
2492 | // If the user set the address of the text segment, that may not be |
2493 | // compatible with putting the segment headers and file headers into | |
2494 | // that segment. For isolate_execinstr() targets, it's the rodata | |
2495 | // segment rather than text where we might put the headers. | |
2496 | static inline bool | |
2497 | load_seg_unusable_for_headers(const Target* target) | |
2498 | { | |
2499 | const General_options& options = parameters->options(); | |
2500 | if (target->isolate_execinstr()) | |
2501 | return (options.user_set_Trodata_segment() | |
2502 | && options.Trodata_segment() % target->abi_pagesize() != 0); | |
2503 | else | |
2504 | return (options.user_set_Ttext() | |
2505 | && options.Ttext() % target->abi_pagesize() != 0); | |
2506 | } | |
2507 | ||
20e6d0d6 DK |
2508 | // Relaxation loop body: If target has no relaxation, this runs only once |
2509 | // Otherwise, the target relaxation hook is called at the end of | |
2510 | // each iteration. If the hook returns true, it means re-layout of | |
2e702c99 | 2511 | // section is required. |
20e6d0d6 DK |
2512 | // |
2513 | // The number of segments created by a linking script without a PHDRS | |
2514 | // clause may be affected by section sizes and alignments. There is | |
2515 | // a remote chance that relaxation causes different number of PT_LOAD | |
2516 | // segments are created and sections are attached to different segments. | |
2517 | // Therefore, we always throw away all segments created during section | |
2518 | // layout. In order to be able to restart the section layout, we keep | |
2519 | // a copy of the segment list right before the relaxation loop and use | |
2520 | // that to restore the segments. | |
2e702c99 RM |
2521 | // |
2522 | // PASS is the current relaxation pass number. | |
20e6d0d6 DK |
2523 | // SYMTAB is a symbol table. |
2524 | // PLOAD_SEG is the address of a pointer for the load segment. | |
2525 | // PHDR_SEG is a pointer to the PHDR segment. | |
2526 | // SEGMENT_HEADERS points to the output segment header. | |
2527 | // FILE_HEADER points to the output file header. | |
2528 | // PSHNDX is the address to store the output section index. | |
2529 | ||
2530 | off_t inline | |
2531 | Layout::relaxation_loop_body( | |
2532 | int pass, | |
2533 | Target* target, | |
2534 | Symbol_table* symtab, | |
2535 | Output_segment** pload_seg, | |
2536 | Output_segment* phdr_seg, | |
2537 | Output_segment_headers* segment_headers, | |
2538 | Output_file_header* file_header, | |
2539 | unsigned int* pshndx) | |
2540 | { | |
2541 | // If this is not the first iteration, we need to clean up after | |
2542 | // relaxation so that we can lay out the sections again. | |
2543 | if (pass != 0) | |
2544 | this->clean_up_after_relaxation(); | |
2545 | ||
2546 | // If there is a SECTIONS clause, put all the input sections into | |
2547 | // the required order. | |
2548 | Output_segment* load_seg; | |
2549 | if (this->script_options_->saw_sections_clause()) | |
2550 | load_seg = this->set_section_addresses_from_script(symtab); | |
2551 | else if (parameters->options().relocatable()) | |
2552 | load_seg = NULL; | |
2553 | else | |
2e702c99 | 2554 | load_seg = this->find_first_load_seg(target); |
20e6d0d6 DK |
2555 | |
2556 | if (parameters->options().oformat_enum() | |
2557 | != General_options::OBJECT_FORMAT_ELF) | |
2558 | load_seg = NULL; | |
2559 | ||
a3ed37d8 | 2560 | if (load_seg_unusable_for_headers(target)) |
d12a5ea8 ILT |
2561 | { |
2562 | load_seg = NULL; | |
2563 | phdr_seg = NULL; | |
2564 | } | |
403a15dd | 2565 | |
68b6574b ILT |
2566 | gold_assert(phdr_seg == NULL |
2567 | || load_seg != NULL | |
2568 | || this->script_options_->saw_sections_clause()); | |
20e6d0d6 | 2569 | |
a192ba05 | 2570 | // If the address of the load segment we found has been set by |
1e3811b0 ILT |
2571 | // --section-start rather than by a script, then adjust the VMA and |
2572 | // LMA downward if possible to include the file and section headers. | |
2573 | uint64_t header_gap = 0; | |
a192ba05 ILT |
2574 | if (load_seg != NULL |
2575 | && load_seg->are_addresses_set() | |
1e3811b0 ILT |
2576 | && !this->script_options_->saw_sections_clause() |
2577 | && !parameters->options().relocatable()) | |
2578 | { | |
2579 | file_header->finalize_data_size(); | |
2580 | segment_headers->finalize_data_size(); | |
2581 | size_t sizeof_headers = (file_header->data_size() | |
2582 | + segment_headers->data_size()); | |
2583 | const uint64_t abi_pagesize = target->abi_pagesize(); | |
2584 | uint64_t hdr_paddr = load_seg->paddr() - sizeof_headers; | |
2585 | hdr_paddr &= ~(abi_pagesize - 1); | |
2586 | uint64_t subtract = load_seg->paddr() - hdr_paddr; | |
2587 | if (load_seg->paddr() < subtract || load_seg->vaddr() < subtract) | |
2588 | load_seg = NULL; | |
2589 | else | |
2590 | { | |
2591 | load_seg->set_addresses(load_seg->vaddr() - subtract, | |
2592 | load_seg->paddr() - subtract); | |
2593 | header_gap = subtract - sizeof_headers; | |
2594 | } | |
2595 | } | |
a192ba05 | 2596 | |
20e6d0d6 DK |
2597 | // Lay out the segment headers. |
2598 | if (!parameters->options().relocatable()) | |
2599 | { | |
2600 | gold_assert(segment_headers != NULL); | |
1e3811b0 ILT |
2601 | if (header_gap != 0 && load_seg != NULL) |
2602 | { | |
2603 | Output_data_zero_fill* z = new Output_data_zero_fill(header_gap, 1); | |
2604 | load_seg->add_initial_output_data(z); | |
2605 | } | |
20e6d0d6 | 2606 | if (load_seg != NULL) |
2e702c99 | 2607 | load_seg->add_initial_output_data(segment_headers); |
20e6d0d6 | 2608 | if (phdr_seg != NULL) |
2e702c99 | 2609 | phdr_seg->add_initial_output_data(segment_headers); |
20e6d0d6 DK |
2610 | } |
2611 | ||
2612 | // Lay out the file header. | |
2613 | if (load_seg != NULL) | |
2614 | load_seg->add_initial_output_data(file_header); | |
2615 | ||
2616 | if (this->script_options_->saw_phdrs_clause() | |
2617 | && !parameters->options().relocatable()) | |
2618 | { | |
2619 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS | |
2620 | // clause in a linker script. | |
2621 | Script_sections* ss = this->script_options_->script_sections(); | |
2622 | ss->put_headers_in_phdrs(file_header, segment_headers); | |
2623 | } | |
2624 | ||
2625 | // We set the output section indexes in set_segment_offsets and | |
2626 | // set_section_indexes. | |
2627 | *pshndx = 1; | |
2628 | ||
2629 | // Set the file offsets of all the segments, and all the sections | |
2630 | // they contain. | |
2631 | off_t off; | |
2632 | if (!parameters->options().relocatable()) | |
2633 | off = this->set_segment_offsets(target, load_seg, pshndx); | |
2634 | else | |
2635 | off = this->set_relocatable_section_offsets(file_header, pshndx); | |
2636 | ||
2637 | // Verify that the dummy relaxation does not change anything. | |
2638 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2639 | { | |
2640 | if (pass == 0) | |
2641 | this->relaxation_debug_check_->read_sections(this->section_list_); | |
2642 | else | |
2643 | this->relaxation_debug_check_->verify_sections(this->section_list_); | |
2644 | } | |
2645 | ||
2646 | *pload_seg = load_seg; | |
2647 | return off; | |
2648 | } | |
2649 | ||
5c3024d2 | 2650 | // Search the list of patterns and find the position of the given section |
6e9ba2ca ST |
2651 | // name in the output section. If the section name matches a glob |
2652 | // pattern and a non-glob name, then the non-glob position takes | |
2653 | // precedence. Return 0 if no match is found. | |
2654 | ||
2655 | unsigned int | |
2656 | Layout::find_section_order_index(const std::string& section_name) | |
2657 | { | |
2658 | Unordered_map<std::string, unsigned int>::iterator map_it; | |
2659 | map_it = this->input_section_position_.find(section_name); | |
2660 | if (map_it != this->input_section_position_.end()) | |
2661 | return map_it->second; | |
2662 | ||
2663 | // Absolute match failed. Linear search the glob patterns. | |
2664 | std::vector<std::string>::iterator it; | |
2665 | for (it = this->input_section_glob_.begin(); | |
2666 | it != this->input_section_glob_.end(); | |
2667 | ++it) | |
2668 | { | |
2669 | if (fnmatch((*it).c_str(), section_name.c_str(), FNM_NOESCAPE) == 0) | |
2e702c99 RM |
2670 | { |
2671 | map_it = this->input_section_position_.find(*it); | |
2672 | gold_assert(map_it != this->input_section_position_.end()); | |
2673 | return map_it->second; | |
2674 | } | |
6e9ba2ca ST |
2675 | } |
2676 | return 0; | |
2677 | } | |
2678 | ||
2679 | // Read the sequence of input sections from the file specified with | |
e9552f7e | 2680 | // option --section-ordering-file. |
6e9ba2ca ST |
2681 | |
2682 | void | |
2683 | Layout::read_layout_from_file() | |
2684 | { | |
2685 | const char* filename = parameters->options().section_ordering_file(); | |
2686 | std::ifstream in; | |
2687 | std::string line; | |
2688 | ||
2689 | in.open(filename); | |
2690 | if (!in) | |
2691 | gold_fatal(_("unable to open --section-ordering-file file %s: %s"), | |
2e702c99 | 2692 | filename, strerror(errno)); |
6e9ba2ca ST |
2693 | |
2694 | std::getline(in, line); // this chops off the trailing \n, if any | |
2695 | unsigned int position = 1; | |
e9552f7e | 2696 | this->set_section_ordering_specified(); |
6e9ba2ca ST |
2697 | |
2698 | while (in) | |
2699 | { | |
2700 | if (!line.empty() && line[line.length() - 1] == '\r') // Windows | |
2e702c99 | 2701 | line.resize(line.length() - 1); |
6e9ba2ca ST |
2702 | // Ignore comments, beginning with '#' |
2703 | if (line[0] == '#') | |
2e702c99 RM |
2704 | { |
2705 | std::getline(in, line); | |
2706 | continue; | |
2707 | } | |
6e9ba2ca ST |
2708 | this->input_section_position_[line] = position; |
2709 | // Store all glob patterns in a vector. | |
2710 | if (is_wildcard_string(line.c_str())) | |
2e702c99 | 2711 | this->input_section_glob_.push_back(line); |
6e9ba2ca ST |
2712 | position++; |
2713 | std::getline(in, line); | |
2714 | } | |
2715 | } | |
2716 | ||
54dc6425 ILT |
2717 | // Finalize the layout. When this is called, we have created all the |
2718 | // output sections and all the output segments which are based on | |
2719 | // input sections. We have several things to do, and we have to do | |
2720 | // them in the right order, so that we get the right results correctly | |
2721 | // and efficiently. | |
2722 | ||
2723 | // 1) Finalize the list of output segments and create the segment | |
2724 | // table header. | |
2725 | ||
2726 | // 2) Finalize the dynamic symbol table and associated sections. | |
2727 | ||
2728 | // 3) Determine the final file offset of all the output segments. | |
2729 | ||
2730 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
2731 | // sections. | |
2732 | ||
75f65a3e ILT |
2733 | // 5) Create the symbol table sections and the section name table |
2734 | // section. | |
2735 | ||
2736 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
2737 | // value and make a final determination of which symbols are going |
2738 | // into the output symbol table. | |
2739 | ||
54dc6425 ILT |
2740 | // 7) Create the section table header. |
2741 | ||
2742 | // 8) Determine the final file offset of all the output sections which | |
2743 | // are not SHF_ALLOC, including the section table header. | |
2744 | ||
2745 | // 9) Finalize the ELF file header. | |
2746 | ||
75f65a3e ILT |
2747 | // This function returns the size of the output file. |
2748 | ||
2749 | off_t | |
17a1d0a9 | 2750 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
8851ecca | 2751 | Target* target, const Task* task) |
54dc6425 | 2752 | { |
c4d5a762 CC |
2753 | unsigned int local_dynamic_count = 0; |
2754 | unsigned int forced_local_dynamic_count = 0; | |
2755 | ||
f59f41f3 | 2756 | target->finalize_sections(this, input_objects, symtab); |
5a6f7e2d | 2757 | |
17a1d0a9 | 2758 | this->count_local_symbols(task, input_objects); |
7bf1f802 | 2759 | |
1518dc8f | 2760 | this->link_stabs_sections(); |
4f211c8b | 2761 | |
3802b2dd | 2762 | Output_segment* phdr_seg = NULL; |
8851ecca | 2763 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
54dc6425 | 2764 | { |
dbe717ef ILT |
2765 | // There was a dynamic object in the link. We need to create |
2766 | // some information for the dynamic linker. | |
2767 | ||
3802b2dd ILT |
2768 | // Create the PT_PHDR segment which will hold the program |
2769 | // headers. | |
1c4f3631 ILT |
2770 | if (!this->script_options_->saw_phdrs_clause()) |
2771 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
3802b2dd | 2772 | |
14b31740 ILT |
2773 | // Create the dynamic symbol table, including the hash table. |
2774 | Output_section* dynstr; | |
2775 | std::vector<Symbol*> dynamic_symbols; | |
a5dc0706 | 2776 | Versions versions(*this->script_options()->version_script_info(), |
2e702c99 | 2777 | &this->dynpool_); |
9b07f471 | 2778 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
c4d5a762 CC |
2779 | &local_dynamic_count, |
2780 | &forced_local_dynamic_count, | |
2781 | &dynamic_symbols, | |
14b31740 | 2782 | &versions); |
dbe717ef ILT |
2783 | |
2784 | // Create the .interp section to hold the name of the | |
e1f74f98 ILT |
2785 | // interpreter, and put it in a PT_INTERP segment. Don't do it |
2786 | // if we saw a .interp section in an input file. | |
2787 | if ((!parameters->options().shared() | |
2788 | || parameters->options().dynamic_linker() != NULL) | |
2789 | && this->interp_segment_ == NULL) | |
2e702c99 | 2790 | this->create_interp(target); |
a3ad94ed ILT |
2791 | |
2792 | // Finish the .dynamic section to hold the dynamic data, and put | |
2793 | // it in a PT_DYNAMIC segment. | |
16649710 | 2794 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
2795 | |
2796 | // We should have added everything we need to the dynamic string | |
2797 | // table. | |
2798 | this->dynpool_.set_string_offsets(); | |
2799 | ||
2800 | // Create the version sections. We can't do this until the | |
2801 | // dynamic string table is complete. | |
c4d5a762 CC |
2802 | this->create_version_sections(&versions, symtab, |
2803 | (local_dynamic_count | |
2804 | + forced_local_dynamic_count), | |
14b31740 | 2805 | dynamic_symbols, dynstr); |
f0ba79e2 ILT |
2806 | |
2807 | // Set the size of the _DYNAMIC symbol. We can't do this until | |
2808 | // after we call create_version_sections. | |
2809 | this->set_dynamic_symbol_size(symtab); | |
54dc6425 | 2810 | } |
2e702c99 | 2811 | |
20e6d0d6 DK |
2812 | // Create segment headers. |
2813 | Output_segment_headers* segment_headers = | |
2814 | (parameters->options().relocatable() | |
2815 | ? NULL | |
2816 | : new Output_segment_headers(this->segment_list_)); | |
75f65a3e ILT |
2817 | |
2818 | // Lay out the file header. | |
a10ae760 ILT |
2819 | Output_file_header* file_header = new Output_file_header(target, symtab, |
2820 | segment_headers); | |
a445fddf | 2821 | |
61ba1cf9 | 2822 | this->special_output_list_.push_back(file_header); |
6a74a719 ILT |
2823 | if (segment_headers != NULL) |
2824 | this->special_output_list_.push_back(segment_headers); | |
75f65a3e | 2825 | |
20e6d0d6 DK |
2826 | // Find approriate places for orphan output sections if we are using |
2827 | // a linker script. | |
2828 | if (this->script_options_->saw_sections_clause()) | |
2829 | this->place_orphan_sections_in_script(); | |
2e702c99 | 2830 | |
20e6d0d6 DK |
2831 | Output_segment* load_seg; |
2832 | off_t off; | |
2833 | unsigned int shndx; | |
2834 | int pass = 0; | |
2835 | ||
2836 | // Take a snapshot of the section layout as needed. | |
2837 | if (target->may_relax()) | |
2838 | this->prepare_for_relaxation(); | |
2e702c99 | 2839 | |
20e6d0d6 DK |
2840 | // Run the relaxation loop to lay out sections. |
2841 | do | |
1c4f3631 | 2842 | { |
20e6d0d6 DK |
2843 | off = this->relaxation_loop_body(pass, target, symtab, &load_seg, |
2844 | phdr_seg, segment_headers, file_header, | |
2845 | &shndx); | |
2846 | pass++; | |
1c4f3631 | 2847 | } |
c0a62865 | 2848 | while (target->may_relax() |
f625ae50 | 2849 | && target->relax(pass, input_objects, symtab, this, task)); |
75f65a3e | 2850 | |
eabc84f4 RM |
2851 | // If there is a load segment that contains the file and program headers, |
2852 | // provide a symbol __ehdr_start pointing there. | |
2853 | // A program can use this to examine itself robustly. | |
d1bddd3c CC |
2854 | Symbol *ehdr_start = symtab->lookup("__ehdr_start"); |
2855 | if (ehdr_start != NULL && ehdr_start->is_predefined()) | |
2856 | { | |
2857 | if (load_seg != NULL) | |
2858 | ehdr_start->set_output_segment(load_seg, Symbol::SEGMENT_START); | |
2859 | else | |
1130c90e | 2860 | ehdr_start->set_undefined(); |
d1bddd3c | 2861 | } |
eabc84f4 | 2862 | |
a9a60db6 ILT |
2863 | // Set the file offsets of all the non-data sections we've seen so |
2864 | // far which don't have to wait for the input sections. We need | |
2865 | // this in order to finalize local symbols in non-allocated | |
2866 | // sections. | |
2867 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); | |
2868 | ||
d491d34e ILT |
2869 | // Set the section indexes of all unallocated sections seen so far, |
2870 | // in case any of them are somehow referenced by a symbol. | |
2871 | shndx = this->set_section_indexes(shndx); | |
2872 | ||
75f65a3e | 2873 | // Create the symbol table sections. |
c4d5a762 CC |
2874 | this->create_symtab_sections(input_objects, symtab, shndx, &off, |
2875 | local_dynamic_count); | |
7bf1f802 ILT |
2876 | if (!parameters->doing_static_link()) |
2877 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e | 2878 | |
e5756efb ILT |
2879 | // Process any symbol assignments from a linker script. This must |
2880 | // be called after the symbol table has been finalized. | |
2881 | this->script_options_->finalize_symbols(symtab, this); | |
2882 | ||
09ec0418 CC |
2883 | // Create the incremental inputs sections. |
2884 | if (this->incremental_inputs_) | |
2885 | { | |
2886 | this->incremental_inputs_->finalize(); | |
2887 | this->create_incremental_info_sections(symtab); | |
2888 | } | |
2889 | ||
75f65a3e ILT |
2890 | // Create the .shstrtab section. |
2891 | Output_section* shstrtab_section = this->create_shstrtab(); | |
2892 | ||
a9a60db6 ILT |
2893 | // Set the file offsets of the rest of the non-data sections which |
2894 | // don't have to wait for the input sections. | |
9a0910c3 | 2895 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 | 2896 | |
d491d34e ILT |
2897 | // Now that all sections have been created, set the section indexes |
2898 | // for any sections which haven't been done yet. | |
86887060 | 2899 | shndx = this->set_section_indexes(shndx); |
ead1e424 | 2900 | |
75f65a3e | 2901 | // Create the section table header. |
d491d34e | 2902 | this->create_shdrs(shstrtab_section, &off); |
75f65a3e | 2903 | |
17a1d0a9 ILT |
2904 | // If there are no sections which require postprocessing, we can |
2905 | // handle the section names now, and avoid a resize later. | |
2906 | if (!this->any_postprocessing_sections_) | |
09ec0418 CC |
2907 | { |
2908 | off = this->set_section_offsets(off, | |
2909 | POSTPROCESSING_SECTIONS_PASS); | |
2910 | off = | |
2911 | this->set_section_offsets(off, | |
17a1d0a9 | 2912 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); |
09ec0418 | 2913 | } |
17a1d0a9 | 2914 | |
27bc2bce | 2915 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 2916 | |
27bc2bce ILT |
2917 | // Now we know exactly where everything goes in the output file |
2918 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 2919 | Output_data::layout_complete(); |
75f65a3e | 2920 | |
e44fcf3b ILT |
2921 | this->output_file_size_ = off; |
2922 | ||
75f65a3e ILT |
2923 | return off; |
2924 | } | |
2925 | ||
8ed814a9 | 2926 | // Create a note header following the format defined in the ELF ABI. |
ec3f783e ILT |
2927 | // NAME is the name, NOTE_TYPE is the type, SECTION_NAME is the name |
2928 | // of the section to create, DESCSZ is the size of the descriptor. | |
2929 | // ALLOCATE is true if the section should be allocated in memory. | |
2930 | // This returns the new note section. It sets *TRAILING_PADDING to | |
2931 | // the number of trailing zero bytes required. | |
4f211c8b | 2932 | |
8ed814a9 | 2933 | Output_section* |
ef4ab7a8 PP |
2934 | Layout::create_note(const char* name, int note_type, |
2935 | const char* section_name, size_t descsz, | |
8ed814a9 | 2936 | bool allocate, size_t* trailing_padding) |
4f211c8b | 2937 | { |
e2305dc0 ILT |
2938 | // Authorities all agree that the values in a .note field should |
2939 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
2940 | // they differ on what the alignment is for 64-bit binaries. | |
2941 | // The GABI says unambiguously they take 8-byte alignment: | |
2942 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
2943 | // Other documentation says alignment should always be 4 bytes: | |
2944 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
2945 | // GNU ld and GNU readelf both support the latter (at least as of | |
2946 | // version 2.16.91), and glibc always generates the latter for | |
2947 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
2948 | // here. | |
35cdfc9a | 2949 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
8851ecca | 2950 | const int size = parameters->target().get_size(); |
e2305dc0 ILT |
2951 | #else |
2952 | const int size = 32; | |
2953 | #endif | |
4f211c8b ILT |
2954 | |
2955 | // The contents of the .note section. | |
4f211c8b ILT |
2956 | size_t namesz = strlen(name) + 1; |
2957 | size_t aligned_namesz = align_address(namesz, size / 8); | |
4f211c8b | 2958 | size_t aligned_descsz = align_address(descsz, size / 8); |
4f211c8b | 2959 | |
8ed814a9 | 2960 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
4f211c8b | 2961 | |
8ed814a9 ILT |
2962 | unsigned char* buffer = new unsigned char[notehdrsz]; |
2963 | memset(buffer, 0, notehdrsz); | |
4f211c8b | 2964 | |
8851ecca | 2965 | bool is_big_endian = parameters->target().is_big_endian(); |
4f211c8b ILT |
2966 | |
2967 | if (size == 32) | |
2968 | { | |
2969 | if (!is_big_endian) | |
2970 | { | |
2971 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
2972 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
2973 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
2974 | } | |
2975 | else | |
2976 | { | |
2977 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
2978 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
2979 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
2980 | } | |
2981 | } | |
2982 | else if (size == 64) | |
2983 | { | |
2984 | if (!is_big_endian) | |
2985 | { | |
2986 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
2987 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
2988 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
2989 | } | |
2990 | else | |
2991 | { | |
2992 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
2993 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
2994 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
2995 | } | |
2996 | } | |
2997 | else | |
2998 | gold_unreachable(); | |
2999 | ||
3000 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
4f211c8b | 3001 | |
8ed814a9 | 3002 | elfcpp::Elf_Xword flags = 0; |
22f0da72 | 3003 | Output_section_order order = ORDER_INVALID; |
8ed814a9 | 3004 | if (allocate) |
22f0da72 ILT |
3005 | { |
3006 | flags = elfcpp::SHF_ALLOC; | |
3007 | order = ORDER_RO_NOTE; | |
3008 | } | |
ec3f783e ILT |
3009 | Output_section* os = this->choose_output_section(NULL, section_name, |
3010 | elfcpp::SHT_NOTE, | |
03fb64f8 | 3011 | flags, false, order, false, |
412ffd83 | 3012 | false, true); |
9c547ec3 ILT |
3013 | if (os == NULL) |
3014 | return NULL; | |
3015 | ||
8ed814a9 | 3016 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, |
7d9e3d98 ILT |
3017 | size / 8, |
3018 | "** note header"); | |
8ed814a9 ILT |
3019 | os->add_output_section_data(posd); |
3020 | ||
3021 | *trailing_padding = aligned_descsz - descsz; | |
3022 | ||
3023 | return os; | |
3024 | } | |
3025 | ||
3026 | // For an executable or shared library, create a note to record the | |
3027 | // version of gold used to create the binary. | |
3028 | ||
3029 | void | |
3030 | Layout::create_gold_note() | |
3031 | { | |
cdc29364 CC |
3032 | if (parameters->options().relocatable() |
3033 | || parameters->incremental_update()) | |
8ed814a9 ILT |
3034 | return; |
3035 | ||
3036 | std::string desc = std::string("gold ") + gold::get_version_string(); | |
3037 | ||
3038 | size_t trailing_padding; | |
ca09d69a | 3039 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, |
ef4ab7a8 PP |
3040 | ".note.gnu.gold-version", desc.size(), |
3041 | false, &trailing_padding); | |
9c547ec3 ILT |
3042 | if (os == NULL) |
3043 | return; | |
8ed814a9 ILT |
3044 | |
3045 | Output_section_data* posd = new Output_data_const(desc, 4); | |
4f211c8b | 3046 | os->add_output_section_data(posd); |
8ed814a9 ILT |
3047 | |
3048 | if (trailing_padding > 0) | |
3049 | { | |
7d9e3d98 | 3050 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
3051 | os->add_output_section_data(posd); |
3052 | } | |
4f211c8b ILT |
3053 | } |
3054 | ||
35cdfc9a ILT |
3055 | // Record whether the stack should be executable. This can be set |
3056 | // from the command line using the -z execstack or -z noexecstack | |
3057 | // options. Otherwise, if any input file has a .note.GNU-stack | |
3058 | // section with the SHF_EXECINSTR flag set, the stack should be | |
3059 | // executable. Otherwise, if at least one input file a | |
3060 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
3061 | // section, we use the target default for whether the stack should be | |
1130c90e RM |
3062 | // executable. If -z stack-size was used to set a p_memsz value for |
3063 | // PT_GNU_STACK, we generate the segment regardless. Otherwise, we | |
3064 | // don't generate a stack note. When generating a object file, we | |
3065 | // create a .note.GNU-stack section with the appropriate marking. | |
3066 | // When generating an executable or shared library, we create a | |
3067 | // PT_GNU_STACK segment. | |
35cdfc9a ILT |
3068 | |
3069 | void | |
1130c90e | 3070 | Layout::create_stack_segment() |
35cdfc9a ILT |
3071 | { |
3072 | bool is_stack_executable; | |
e55bde5e | 3073 | if (parameters->options().is_execstack_set()) |
d8e60314 CC |
3074 | { |
3075 | is_stack_executable = parameters->options().is_stack_executable(); | |
3076 | if (!is_stack_executable | |
1130c90e RM |
3077 | && this->input_requires_executable_stack_ |
3078 | && parameters->options().warn_execstack()) | |
d8e60314 | 3079 | gold_warning(_("one or more inputs require executable stack, " |
1130c90e | 3080 | "but -z noexecstack was given")); |
d8e60314 | 3081 | } |
1130c90e RM |
3082 | else if (!this->input_with_gnu_stack_note_ |
3083 | && (!parameters->options().user_set_stack_size() | |
3084 | || parameters->options().relocatable())) | |
35cdfc9a ILT |
3085 | return; |
3086 | else | |
3087 | { | |
3088 | if (this->input_requires_executable_stack_) | |
3089 | is_stack_executable = true; | |
3090 | else if (this->input_without_gnu_stack_note_) | |
9c547ec3 ILT |
3091 | is_stack_executable = |
3092 | parameters->target().is_default_stack_executable(); | |
35cdfc9a ILT |
3093 | else |
3094 | is_stack_executable = false; | |
3095 | } | |
3096 | ||
8851ecca | 3097 | if (parameters->options().relocatable()) |
35cdfc9a ILT |
3098 | { |
3099 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
3100 | elfcpp::Elf_Xword flags = 0; | |
3101 | if (is_stack_executable) | |
3102 | flags |= elfcpp::SHF_EXECINSTR; | |
22f0da72 ILT |
3103 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags, |
3104 | ORDER_INVALID, false); | |
35cdfc9a ILT |
3105 | } |
3106 | else | |
3107 | { | |
1c4f3631 ILT |
3108 | if (this->script_options_->saw_phdrs_clause()) |
3109 | return; | |
35cdfc9a ILT |
3110 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
3111 | if (is_stack_executable) | |
3112 | flags |= elfcpp::PF_X; | |
1130c90e RM |
3113 | Output_segment* seg = |
3114 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); | |
3115 | seg->set_size(parameters->options().stack_size()); | |
3116 | // BFD lets targets override this default alignment, but the only | |
3117 | // targets that do so are ones that Gold does not support so far. | |
3118 | seg->set_minimum_p_align(16); | |
35cdfc9a ILT |
3119 | } |
3120 | } | |
3121 | ||
8ed814a9 ILT |
3122 | // If --build-id was used, set up the build ID note. |
3123 | ||
3124 | void | |
3125 | Layout::create_build_id() | |
3126 | { | |
3127 | if (!parameters->options().user_set_build_id()) | |
3128 | return; | |
3129 | ||
3130 | const char* style = parameters->options().build_id(); | |
3131 | if (strcmp(style, "none") == 0) | |
3132 | return; | |
3133 | ||
3134 | // Set DESCSZ to the size of the note descriptor. When possible, | |
3135 | // set DESC to the note descriptor contents. | |
3136 | size_t descsz; | |
3137 | std::string desc; | |
3138 | if (strcmp(style, "md5") == 0) | |
3139 | descsz = 128 / 8; | |
e7c5ea40 | 3140 | else if ((strcmp(style, "sha1") == 0) || (strcmp(style, "tree") == 0)) |
8ed814a9 ILT |
3141 | descsz = 160 / 8; |
3142 | else if (strcmp(style, "uuid") == 0) | |
3143 | { | |
b32e1756 | 3144 | #ifndef __MINGW32__ |
8ed814a9 ILT |
3145 | const size_t uuidsz = 128 / 8; |
3146 | ||
3147 | char buffer[uuidsz]; | |
3148 | memset(buffer, 0, uuidsz); | |
3149 | ||
2a00e4fb | 3150 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
8ed814a9 ILT |
3151 | if (descriptor < 0) |
3152 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), | |
3153 | strerror(errno)); | |
3154 | else | |
3155 | { | |
3156 | ssize_t got = ::read(descriptor, buffer, uuidsz); | |
2a00e4fb | 3157 | release_descriptor(descriptor, true); |
8ed814a9 ILT |
3158 | if (got < 0) |
3159 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); | |
3160 | else if (static_cast<size_t>(got) != uuidsz) | |
3161 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), | |
3162 | uuidsz, got); | |
3163 | } | |
3164 | ||
3165 | desc.assign(buffer, uuidsz); | |
3166 | descsz = uuidsz; | |
b32e1756 IK |
3167 | #else // __MINGW32__ |
3168 | UUID uuid; | |
3169 | typedef RPC_STATUS (RPC_ENTRY *UuidCreateFn)(UUID *Uuid); | |
3170 | ||
3171 | HMODULE rpc_library = LoadLibrary("rpcrt4.dll"); | |
3172 | if (!rpc_library) | |
3173 | gold_error(_("--build-id=uuid failed: could not load rpcrt4.dll")); | |
3174 | else | |
3175 | { | |
3176 | UuidCreateFn uuid_create = reinterpret_cast<UuidCreateFn>( | |
3177 | GetProcAddress(rpc_library, "UuidCreate")); | |
3178 | if (!uuid_create) | |
3179 | gold_error(_("--build-id=uuid failed: could not find UuidCreate")); | |
3180 | else if (uuid_create(&uuid) != RPC_S_OK) | |
3181 | gold_error(_("__build_id=uuid failed: call UuidCreate() failed")); | |
3182 | FreeLibrary(rpc_library); | |
3183 | } | |
3184 | desc.assign(reinterpret_cast<const char *>(&uuid), sizeof(UUID)); | |
3185 | descsz = sizeof(UUID); | |
3186 | #endif // __MINGW32__ | |
8ed814a9 ILT |
3187 | } |
3188 | else if (strncmp(style, "0x", 2) == 0) | |
3189 | { | |
3190 | hex_init(); | |
3191 | const char* p = style + 2; | |
3192 | while (*p != '\0') | |
3193 | { | |
3194 | if (hex_p(p[0]) && hex_p(p[1])) | |
3195 | { | |
3196 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); | |
3197 | desc += c; | |
3198 | p += 2; | |
3199 | } | |
3200 | else if (*p == '-' || *p == ':') | |
3201 | ++p; | |
3202 | else | |
3203 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), | |
3204 | style); | |
3205 | } | |
3206 | descsz = desc.size(); | |
3207 | } | |
3208 | else | |
3209 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); | |
3210 | ||
3211 | // Create the note. | |
3212 | size_t trailing_padding; | |
3213 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, | |
ef4ab7a8 PP |
3214 | ".note.gnu.build-id", descsz, true, |
3215 | &trailing_padding); | |
9c547ec3 ILT |
3216 | if (os == NULL) |
3217 | return; | |
8ed814a9 ILT |
3218 | |
3219 | if (!desc.empty()) | |
3220 | { | |
3221 | // We know the value already, so we fill it in now. | |
3222 | gold_assert(desc.size() == descsz); | |
3223 | ||
3224 | Output_section_data* posd = new Output_data_const(desc, 4); | |
3225 | os->add_output_section_data(posd); | |
3226 | ||
3227 | if (trailing_padding != 0) | |
3228 | { | |
7d9e3d98 | 3229 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
3230 | os->add_output_section_data(posd); |
3231 | } | |
3232 | } | |
3233 | else | |
3234 | { | |
3235 | // We need to compute a checksum after we have completed the | |
3236 | // link. | |
3237 | gold_assert(trailing_padding == 0); | |
7d9e3d98 | 3238 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
8ed814a9 | 3239 | os->add_output_section_data(this->build_id_note_); |
8ed814a9 ILT |
3240 | } |
3241 | } | |
3242 | ||
1518dc8f ILT |
3243 | // If we have both .stabXX and .stabXXstr sections, then the sh_link |
3244 | // field of the former should point to the latter. I'm not sure who | |
3245 | // started this, but the GNU linker does it, and some tools depend | |
3246 | // upon it. | |
3247 | ||
3248 | void | |
3249 | Layout::link_stabs_sections() | |
3250 | { | |
3251 | if (!this->have_stabstr_section_) | |
3252 | return; | |
3253 | ||
3254 | for (Section_list::iterator p = this->section_list_.begin(); | |
3255 | p != this->section_list_.end(); | |
3256 | ++p) | |
3257 | { | |
3258 | if ((*p)->type() != elfcpp::SHT_STRTAB) | |
3259 | continue; | |
3260 | ||
3261 | const char* name = (*p)->name(); | |
3262 | if (strncmp(name, ".stab", 5) != 0) | |
3263 | continue; | |
3264 | ||
3265 | size_t len = strlen(name); | |
3266 | if (strcmp(name + len - 3, "str") != 0) | |
3267 | continue; | |
3268 | ||
3269 | std::string stab_name(name, len - 3); | |
3270 | Output_section* stab_sec; | |
3271 | stab_sec = this->find_output_section(stab_name.c_str()); | |
3272 | if (stab_sec != NULL) | |
3273 | stab_sec->set_link_section(*p); | |
3274 | } | |
3275 | } | |
3276 | ||
09ec0418 | 3277 | // Create .gnu_incremental_inputs and related sections needed |
3ce2c28e ILT |
3278 | // for the next run of incremental linking to check what has changed. |
3279 | ||
3280 | void | |
09ec0418 | 3281 | Layout::create_incremental_info_sections(Symbol_table* symtab) |
3ce2c28e | 3282 | { |
09ec0418 CC |
3283 | Incremental_inputs* incr = this->incremental_inputs_; |
3284 | ||
3285 | gold_assert(incr != NULL); | |
3286 | ||
3287 | // Create the .gnu_incremental_inputs, _symtab, and _relocs input sections. | |
3288 | incr->create_data_sections(symtab); | |
3ce2c28e ILT |
3289 | |
3290 | // Add the .gnu_incremental_inputs section. | |
ca09d69a | 3291 | const char* incremental_inputs_name = |
3ce2c28e | 3292 | this->namepool_.add(".gnu_incremental_inputs", false, NULL); |
09ec0418 | 3293 | Output_section* incremental_inputs_os = |
3ce2c28e | 3294 | this->make_output_section(incremental_inputs_name, |
f5c870d2 | 3295 | elfcpp::SHT_GNU_INCREMENTAL_INPUTS, 0, |
22f0da72 | 3296 | ORDER_INVALID, false); |
09ec0418 CC |
3297 | incremental_inputs_os->add_output_section_data(incr->inputs_section()); |
3298 | ||
3299 | // Add the .gnu_incremental_symtab section. | |
ca09d69a | 3300 | const char* incremental_symtab_name = |
09ec0418 CC |
3301 | this->namepool_.add(".gnu_incremental_symtab", false, NULL); |
3302 | Output_section* incremental_symtab_os = | |
3303 | this->make_output_section(incremental_symtab_name, | |
3304 | elfcpp::SHT_GNU_INCREMENTAL_SYMTAB, 0, | |
3305 | ORDER_INVALID, false); | |
3306 | incremental_symtab_os->add_output_section_data(incr->symtab_section()); | |
3307 | incremental_symtab_os->set_entsize(4); | |
3308 | ||
3309 | // Add the .gnu_incremental_relocs section. | |
ca09d69a | 3310 | const char* incremental_relocs_name = |
09ec0418 CC |
3311 | this->namepool_.add(".gnu_incremental_relocs", false, NULL); |
3312 | Output_section* incremental_relocs_os = | |
3313 | this->make_output_section(incremental_relocs_name, | |
3314 | elfcpp::SHT_GNU_INCREMENTAL_RELOCS, 0, | |
3315 | ORDER_INVALID, false); | |
3316 | incremental_relocs_os->add_output_section_data(incr->relocs_section()); | |
3317 | incremental_relocs_os->set_entsize(incr->relocs_entsize()); | |
3318 | ||
0e70b911 | 3319 | // Add the .gnu_incremental_got_plt section. |
ca09d69a | 3320 | const char* incremental_got_plt_name = |
0e70b911 CC |
3321 | this->namepool_.add(".gnu_incremental_got_plt", false, NULL); |
3322 | Output_section* incremental_got_plt_os = | |
3323 | this->make_output_section(incremental_got_plt_name, | |
3324 | elfcpp::SHT_GNU_INCREMENTAL_GOT_PLT, 0, | |
3325 | ORDER_INVALID, false); | |
3326 | incremental_got_plt_os->add_output_section_data(incr->got_plt_section()); | |
3327 | ||
3ce2c28e | 3328 | // Add the .gnu_incremental_strtab section. |
ca09d69a | 3329 | const char* incremental_strtab_name = |
3ce2c28e | 3330 | this->namepool_.add(".gnu_incremental_strtab", false, NULL); |
09ec0418 | 3331 | Output_section* incremental_strtab_os = this->make_output_section(incremental_strtab_name, |
2e702c99 RM |
3332 | elfcpp::SHT_STRTAB, 0, |
3333 | ORDER_INVALID, false); | |
3ce2c28e | 3334 | Output_data_strtab* strtab_data = |
09ec0418 CC |
3335 | new Output_data_strtab(incr->get_stringpool()); |
3336 | incremental_strtab_os->add_output_section_data(strtab_data); | |
3337 | ||
3338 | incremental_inputs_os->set_after_input_sections(); | |
3339 | incremental_symtab_os->set_after_input_sections(); | |
3340 | incremental_relocs_os->set_after_input_sections(); | |
0e70b911 | 3341 | incremental_got_plt_os->set_after_input_sections(); |
09ec0418 CC |
3342 | |
3343 | incremental_inputs_os->set_link_section(incremental_strtab_os); | |
3344 | incremental_symtab_os->set_link_section(incremental_inputs_os); | |
3345 | incremental_relocs_os->set_link_section(incremental_inputs_os); | |
0e70b911 | 3346 | incremental_got_plt_os->set_link_section(incremental_inputs_os); |
3ce2c28e ILT |
3347 | } |
3348 | ||
75f65a3e ILT |
3349 | // Return whether SEG1 should be before SEG2 in the output file. This |
3350 | // is based entirely on the segment type and flags. When this is | |
aecf301f | 3351 | // called the segment addresses have normally not yet been set. |
75f65a3e ILT |
3352 | |
3353 | bool | |
3354 | Layout::segment_precedes(const Output_segment* seg1, | |
3355 | const Output_segment* seg2) | |
3356 | { | |
0c38a3d1 EC |
3357 | // In order to produce a stable ordering if we're called with the same pointer |
3358 | // return false. | |
3359 | if (seg1 == seg2) | |
3360 | return false; | |
3361 | ||
75f65a3e ILT |
3362 | elfcpp::Elf_Word type1 = seg1->type(); |
3363 | elfcpp::Elf_Word type2 = seg2->type(); | |
3364 | ||
3365 | // The single PT_PHDR segment is required to precede any loadable | |
3366 | // segment. We simply make it always first. | |
3367 | if (type1 == elfcpp::PT_PHDR) | |
3368 | { | |
a3ad94ed | 3369 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
3370 | return true; |
3371 | } | |
3372 | if (type2 == elfcpp::PT_PHDR) | |
3373 | return false; | |
3374 | ||
3375 | // The single PT_INTERP segment is required to precede any loadable | |
3376 | // segment. We simply make it always second. | |
3377 | if (type1 == elfcpp::PT_INTERP) | |
3378 | { | |
a3ad94ed | 3379 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
3380 | return true; |
3381 | } | |
3382 | if (type2 == elfcpp::PT_INTERP) | |
3383 | return false; | |
3384 | ||
3385 | // We then put PT_LOAD segments before any other segments. | |
3386 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
3387 | return true; | |
3388 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
3389 | return false; | |
3390 | ||
9f1d377b ILT |
3391 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
3392 | // segment, because that is where the dynamic linker expects to find | |
3393 | // it (this is just for efficiency; other positions would also work | |
3394 | // correctly). | |
3395 | if (type1 == elfcpp::PT_TLS | |
3396 | && type2 != elfcpp::PT_TLS | |
3397 | && type2 != elfcpp::PT_GNU_RELRO) | |
3398 | return false; | |
3399 | if (type2 == elfcpp::PT_TLS | |
3400 | && type1 != elfcpp::PT_TLS | |
3401 | && type1 != elfcpp::PT_GNU_RELRO) | |
3402 | return true; | |
3403 | ||
3404 | // We put the PT_GNU_RELRO segment last, because that is where the | |
3405 | // dynamic linker expects to find it (as with PT_TLS, this is just | |
3406 | // for efficiency). | |
3407 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) | |
92e059d8 | 3408 | return false; |
9f1d377b | 3409 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
92e059d8 ILT |
3410 | return true; |
3411 | ||
75f65a3e ILT |
3412 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
3413 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
3414 | ||
3415 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
3416 | // by the numeric segment type and flags values. There should not | |
a4034750 AM |
3417 | // be more than one segment with the same type and flags, except |
3418 | // when a linker script specifies such. | |
75f65a3e ILT |
3419 | if (type1 != elfcpp::PT_LOAD) |
3420 | { | |
3421 | if (type1 != type2) | |
3422 | return type1 < type2; | |
a4034750 AM |
3423 | gold_assert(flags1 != flags2 |
3424 | || this->script_options_->saw_phdrs_clause()); | |
75f65a3e ILT |
3425 | return flags1 < flags2; |
3426 | } | |
3427 | ||
a445fddf ILT |
3428 | // If the addresses are set already, sort by load address. |
3429 | if (seg1->are_addresses_set()) | |
3430 | { | |
3431 | if (!seg2->are_addresses_set()) | |
3432 | return true; | |
3433 | ||
3434 | unsigned int section_count1 = seg1->output_section_count(); | |
3435 | unsigned int section_count2 = seg2->output_section_count(); | |
3436 | if (section_count1 == 0 && section_count2 > 0) | |
3437 | return true; | |
3438 | if (section_count1 > 0 && section_count2 == 0) | |
3439 | return false; | |
3440 | ||
b8fa8750 NC |
3441 | uint64_t paddr1 = (seg1->are_addresses_set() |
3442 | ? seg1->paddr() | |
3443 | : seg1->first_section_load_address()); | |
3444 | uint64_t paddr2 = (seg2->are_addresses_set() | |
3445 | ? seg2->paddr() | |
3446 | : seg2->first_section_load_address()); | |
3447 | ||
a445fddf ILT |
3448 | if (paddr1 != paddr2) |
3449 | return paddr1 < paddr2; | |
3450 | } | |
3451 | else if (seg2->are_addresses_set()) | |
3452 | return false; | |
3453 | ||
8a5e3e08 ILT |
3454 | // A segment which holds large data comes after a segment which does |
3455 | // not hold large data. | |
3456 | if (seg1->is_large_data_segment()) | |
3457 | { | |
3458 | if (!seg2->is_large_data_segment()) | |
3459 | return false; | |
3460 | } | |
3461 | else if (seg2->is_large_data_segment()) | |
3462 | return true; | |
3463 | ||
3464 | // Otherwise, we sort PT_LOAD segments based on the flags. Readonly | |
3465 | // segments come before writable segments. Then writable segments | |
3466 | // with data come before writable segments without data. Then | |
3467 | // executable segments come before non-executable segments. Then | |
3468 | // the unlikely case of a non-readable segment comes before the | |
3469 | // normal case of a readable segment. If there are multiple | |
3470 | // segments with the same type and flags, we require that the | |
3471 | // address be set, and we sort by virtual address and then physical | |
3472 | // address. | |
75f65a3e ILT |
3473 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
3474 | return (flags1 & elfcpp::PF_W) == 0; | |
756ac4a8 ILT |
3475 | if ((flags1 & elfcpp::PF_W) != 0 |
3476 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) | |
3477 | return seg1->has_any_data_sections(); | |
75f65a3e ILT |
3478 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
3479 | return (flags1 & elfcpp::PF_X) != 0; | |
3480 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
3481 | return (flags1 & elfcpp::PF_R) == 0; | |
3482 | ||
a445fddf | 3483 | // We shouldn't get here--we shouldn't create segments which we |
aecf301f | 3484 | // can't distinguish. Unless of course we are using a weird linker |
16164a6b ST |
3485 | // script or overlapping --section-start options. We could also get |
3486 | // here if plugins want unique segments for subsets of sections. | |
ea0d8c47 | 3487 | gold_assert(this->script_options_->saw_phdrs_clause() |
16164a6b | 3488 | || parameters->options().any_section_start() |
3b4190cc ST |
3489 | || this->is_unique_segment_for_sections_specified() |
3490 | || parameters->options().text_unlikely_segment()); | |
aecf301f | 3491 | return false; |
75f65a3e ILT |
3492 | } |
3493 | ||
8a5e3e08 ILT |
3494 | // Increase OFF so that it is congruent to ADDR modulo ABI_PAGESIZE. |
3495 | ||
3496 | static off_t | |
3497 | align_file_offset(off_t off, uint64_t addr, uint64_t abi_pagesize) | |
3498 | { | |
3499 | uint64_t unsigned_off = off; | |
3500 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) | |
3501 | | (addr & (abi_pagesize - 1))); | |
3502 | if (aligned_off < unsigned_off) | |
3503 | aligned_off += abi_pagesize; | |
3504 | return aligned_off; | |
3505 | } | |
3506 | ||
a3ed37d8 RM |
3507 | // On targets where the text segment contains only executable code, |
3508 | // a non-executable segment is never the text segment. | |
3509 | ||
3510 | static inline bool | |
3511 | is_text_segment(const Target* target, const Output_segment* seg) | |
3512 | { | |
3513 | elfcpp::Elf_Xword flags = seg->flags(); | |
3514 | if ((flags & elfcpp::PF_W) != 0) | |
3515 | return false; | |
3516 | if ((flags & elfcpp::PF_X) == 0) | |
3517 | return !target->isolate_execinstr(); | |
3518 | return true; | |
3519 | } | |
3520 | ||
ead1e424 | 3521 | // Set the file offsets of all the segments, and all the sections they |
de194d85 | 3522 | // contain. They have all been created. LOAD_SEG must be laid out |
ead1e424 | 3523 | // first. Return the offset of the data to follow. |
75f65a3e ILT |
3524 | |
3525 | off_t | |
ead1e424 | 3526 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
ca09d69a | 3527 | unsigned int* pshndx) |
75f65a3e | 3528 | { |
aecf301f ILT |
3529 | // Sort them into the final order. We use a stable sort so that we |
3530 | // don't randomize the order of indistinguishable segments created | |
3531 | // by linker scripts. | |
3532 | std::stable_sort(this->segment_list_.begin(), this->segment_list_.end(), | |
3533 | Layout::Compare_segments(this)); | |
54dc6425 | 3534 | |
75f65a3e ILT |
3535 | // Find the PT_LOAD segments, and set their addresses and offsets |
3536 | // and their section's addresses and offsets. | |
2e702c99 | 3537 | uint64_t start_addr; |
e55bde5e | 3538 | if (parameters->options().user_set_Ttext()) |
2e702c99 | 3539 | start_addr = parameters->options().Ttext(); |
374ad285 | 3540 | else if (parameters->options().output_is_position_independent()) |
2e702c99 | 3541 | start_addr = 0; |
0c5e9c22 | 3542 | else |
2e702c99 RM |
3543 | start_addr = target->default_text_segment_address(); |
3544 | ||
3545 | uint64_t addr = start_addr; | |
75f65a3e | 3546 | off_t off = 0; |
a445fddf ILT |
3547 | |
3548 | // If LOAD_SEG is NULL, then the file header and segment headers | |
3549 | // will not be loadable. But they still need to be at offset 0 in | |
3550 | // the file. Set their offsets now. | |
3551 | if (load_seg == NULL) | |
3552 | { | |
3553 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
3554 | p != this->special_output_list_.end(); | |
3555 | ++p) | |
3556 | { | |
3557 | off = align_address(off, (*p)->addralign()); | |
3558 | (*p)->set_address_and_file_offset(0, off); | |
3559 | off += (*p)->data_size(); | |
3560 | } | |
3561 | } | |
3562 | ||
1a2dff53 ILT |
3563 | unsigned int increase_relro = this->increase_relro_; |
3564 | if (this->script_options_->saw_sections_clause()) | |
3565 | increase_relro = 0; | |
3566 | ||
34810851 ILT |
3567 | const bool check_sections = parameters->options().check_sections(); |
3568 | Output_segment* last_load_segment = NULL; | |
3569 | ||
2e702c99 RM |
3570 | unsigned int shndx_begin = *pshndx; |
3571 | unsigned int shndx_load_seg = *pshndx; | |
3572 | ||
75f65a3e ILT |
3573 | for (Segment_list::iterator p = this->segment_list_.begin(); |
3574 | p != this->segment_list_.end(); | |
3575 | ++p) | |
3576 | { | |
3577 | if ((*p)->type() == elfcpp::PT_LOAD) | |
3578 | { | |
2e702c99 RM |
3579 | if (target->isolate_execinstr()) |
3580 | { | |
3581 | // When we hit the segment that should contain the | |
3582 | // file headers, reset the file offset so we place | |
3583 | // it and subsequent segments appropriately. | |
3584 | // We'll fix up the preceding segments below. | |
3585 | if (load_seg == *p) | |
3586 | { | |
3587 | if (off == 0) | |
3588 | load_seg = NULL; | |
3589 | else | |
3590 | { | |
3591 | off = 0; | |
3592 | shndx_load_seg = *pshndx; | |
3593 | } | |
3594 | } | |
3595 | } | |
3596 | else | |
3597 | { | |
3598 | // Verify that the file headers fall into the first segment. | |
3599 | if (load_seg != NULL && load_seg != *p) | |
3600 | gold_unreachable(); | |
3601 | load_seg = NULL; | |
3602 | } | |
75f65a3e | 3603 | |
756ac4a8 ILT |
3604 | bool are_addresses_set = (*p)->are_addresses_set(); |
3605 | if (are_addresses_set) | |
3606 | { | |
3607 | // When it comes to setting file offsets, we care about | |
3608 | // the physical address. | |
3609 | addr = (*p)->paddr(); | |
3610 | } | |
9590bf25 | 3611 | else if (parameters->options().user_set_Ttext() |
ebacd51e | 3612 | && (parameters->options().omagic() |
a3ed37d8 RM |
3613 | || is_text_segment(target, *p))) |
3614 | { | |
3615 | are_addresses_set = true; | |
3616 | } | |
3617 | else if (parameters->options().user_set_Trodata_segment() | |
3618 | && ((*p)->flags() & (elfcpp::PF_W | elfcpp::PF_X)) == 0) | |
9590bf25 | 3619 | { |
a3ed37d8 | 3620 | addr = parameters->options().Trodata_segment(); |
9590bf25 CC |
3621 | are_addresses_set = true; |
3622 | } | |
e55bde5e | 3623 | else if (parameters->options().user_set_Tdata() |
756ac4a8 | 3624 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
e55bde5e | 3625 | && (!parameters->options().user_set_Tbss() |
756ac4a8 ILT |
3626 | || (*p)->has_any_data_sections())) |
3627 | { | |
e55bde5e | 3628 | addr = parameters->options().Tdata(); |
756ac4a8 ILT |
3629 | are_addresses_set = true; |
3630 | } | |
e55bde5e | 3631 | else if (parameters->options().user_set_Tbss() |
756ac4a8 ILT |
3632 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
3633 | && !(*p)->has_any_data_sections()) | |
3634 | { | |
e55bde5e | 3635 | addr = parameters->options().Tbss(); |
756ac4a8 ILT |
3636 | are_addresses_set = true; |
3637 | } | |
3638 | ||
75f65a3e ILT |
3639 | uint64_t orig_addr = addr; |
3640 | uint64_t orig_off = off; | |
3641 | ||
a445fddf | 3642 | uint64_t aligned_addr = 0; |
75f65a3e | 3643 | uint64_t abi_pagesize = target->abi_pagesize(); |
af6156ef | 3644 | uint64_t common_pagesize = target->common_pagesize(); |
0496d5e5 | 3645 | |
af6156ef ILT |
3646 | if (!parameters->options().nmagic() |
3647 | && !parameters->options().omagic()) | |
a1373b60 | 3648 | (*p)->set_minimum_p_align(abi_pagesize); |
0496d5e5 | 3649 | |
8a5e3e08 | 3650 | if (!are_addresses_set) |
a445fddf | 3651 | { |
a6577478 RÁE |
3652 | // Skip the address forward one page, maintaining the same |
3653 | // position within the page. This lets us store both segments | |
3654 | // overlapping on a single page in the file, but the loader will | |
3655 | // put them on different pages in memory. We will revisit this | |
3656 | // decision once we know the size of the segment. | |
a445fddf | 3657 | |
a5cd8f05 CC |
3658 | uint64_t max_align = (*p)->maximum_alignment(); |
3659 | if (max_align > abi_pagesize) | |
3660 | addr = align_address(addr, max_align); | |
75f65a3e | 3661 | aligned_addr = addr; |
a445fddf | 3662 | |
2e702c99 RM |
3663 | if (load_seg == *p) |
3664 | { | |
3665 | // This is the segment that will contain the file | |
3666 | // headers, so its offset will have to be exactly zero. | |
3667 | gold_assert(orig_off == 0); | |
3668 | ||
3669 | // If the target wants a fixed minimum distance from the | |
3670 | // text segment to the read-only segment, move up now. | |
bbc5ae17 RM |
3671 | uint64_t min_addr = |
3672 | start_addr + (parameters->options().user_set_rosegment_gap() | |
3673 | ? parameters->options().rosegment_gap() | |
3674 | : target->rosegment_gap()); | |
2e702c99 RM |
3675 | if (addr < min_addr) |
3676 | addr = min_addr; | |
3677 | ||
3678 | // But this is not the first segment! To make its | |
3679 | // address congruent with its offset, that address better | |
3680 | // be aligned to the ABI-mandated page size. | |
3681 | addr = align_address(addr, abi_pagesize); | |
3682 | aligned_addr = addr; | |
3683 | } | |
3684 | else | |
3685 | { | |
3686 | if ((addr & (abi_pagesize - 1)) != 0) | |
3687 | addr = addr + abi_pagesize; | |
a445fddf | 3688 | |
2e702c99 RM |
3689 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
3690 | } | |
75f65a3e ILT |
3691 | } |
3692 | ||
8a5e3e08 ILT |
3693 | if (!parameters->options().nmagic() |
3694 | && !parameters->options().omagic()) | |
7fb47cc9 CC |
3695 | { |
3696 | // Here we are also taking care of the case when | |
3697 | // the maximum segment alignment is larger than the page size. | |
3698 | off = align_file_offset(off, addr, | |
3699 | std::max(abi_pagesize, | |
3700 | (*p)->maximum_alignment())); | |
3701 | } | |
2e702c99 | 3702 | else |
661be1e2 ILT |
3703 | { |
3704 | // This is -N or -n with a section script which prevents | |
3705 | // us from using a load segment. We need to ensure that | |
3706 | // the file offset is aligned to the alignment of the | |
3707 | // segment. This is because the linker script | |
3708 | // implicitly assumed a zero offset. If we don't align | |
3709 | // here, then the alignment of the sections in the | |
3710 | // linker script may not match the alignment of the | |
3711 | // sections in the set_section_addresses call below, | |
3712 | // causing an error about dot moving backward. | |
3713 | off = align_address(off, (*p)->maximum_alignment()); | |
3714 | } | |
8a5e3e08 | 3715 | |
ead1e424 | 3716 | unsigned int shndx_hold = *pshndx; |
fc497986 | 3717 | bool has_relro = false; |
eb426534 RM |
3718 | uint64_t new_addr = (*p)->set_section_addresses(target, this, |
3719 | false, addr, | |
fd064a5b | 3720 | &increase_relro, |
fc497986 | 3721 | &has_relro, |
2e702c99 | 3722 | &off, pshndx); |
75f65a3e ILT |
3723 | |
3724 | // Now that we know the size of this segment, we may be able | |
3725 | // to save a page in memory, at the cost of wasting some | |
3726 | // file space, by instead aligning to the start of a new | |
3727 | // page. Here we use the real machine page size rather than | |
fc497986 CC |
3728 | // the ABI mandated page size. If the segment has been |
3729 | // aligned so that the relro data ends at a page boundary, | |
3730 | // we do not try to realign it. | |
75f65a3e | 3731 | |
cdc29364 CC |
3732 | if (!are_addresses_set |
3733 | && !has_relro | |
3734 | && aligned_addr != addr | |
fb0e076f | 3735 | && !parameters->incremental()) |
75f65a3e | 3736 | { |
75f65a3e ILT |
3737 | uint64_t first_off = (common_pagesize |
3738 | - (aligned_addr | |
3739 | & (common_pagesize - 1))); | |
3740 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
3741 | if (first_off > 0 | |
3742 | && last_off > 0 | |
3743 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
3744 | != (new_addr & ~ (common_pagesize - 1))) | |
3745 | && first_off + last_off <= common_pagesize) | |
3746 | { | |
ead1e424 ILT |
3747 | *pshndx = shndx_hold; |
3748 | addr = align_address(aligned_addr, common_pagesize); | |
a445fddf | 3749 | addr = align_address(addr, (*p)->maximum_alignment()); |
815a1205 AM |
3750 | if ((addr & (abi_pagesize - 1)) != 0) |
3751 | addr = addr + abi_pagesize; | |
75f65a3e | 3752 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
8a5e3e08 | 3753 | off = align_file_offset(off, addr, abi_pagesize); |
3bb951e5 ILT |
3754 | |
3755 | increase_relro = this->increase_relro_; | |
3756 | if (this->script_options_->saw_sections_clause()) | |
3757 | increase_relro = 0; | |
3758 | has_relro = false; | |
3759 | ||
eb426534 RM |
3760 | new_addr = (*p)->set_section_addresses(target, this, |
3761 | true, addr, | |
fd064a5b | 3762 | &increase_relro, |
fc497986 | 3763 | &has_relro, |
2e702c99 | 3764 | &off, pshndx); |
75f65a3e ILT |
3765 | } |
3766 | } | |
3767 | ||
3768 | addr = new_addr; | |
3769 | ||
34810851 ILT |
3770 | // Implement --check-sections. We know that the segments |
3771 | // are sorted by LMA. | |
3772 | if (check_sections && last_load_segment != NULL) | |
3773 | { | |
3774 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); | |
3775 | if (last_load_segment->paddr() + last_load_segment->memsz() | |
3776 | > (*p)->paddr()) | |
3777 | { | |
3778 | unsigned long long lb1 = last_load_segment->paddr(); | |
3779 | unsigned long long le1 = lb1 + last_load_segment->memsz(); | |
3780 | unsigned long long lb2 = (*p)->paddr(); | |
3781 | unsigned long long le2 = lb2 + (*p)->memsz(); | |
3782 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " | |
3783 | "[0x%llx -> 0x%llx]"), | |
3784 | lb1, le1, lb2, le2); | |
3785 | } | |
3786 | } | |
3787 | last_load_segment = *p; | |
75f65a3e ILT |
3788 | } |
3789 | } | |
3790 | ||
2e702c99 RM |
3791 | if (load_seg != NULL && target->isolate_execinstr()) |
3792 | { | |
3793 | // Process the early segments again, setting their file offsets | |
3794 | // so they land after the segments starting at LOAD_SEG. | |
3795 | off = align_file_offset(off, 0, target->abi_pagesize()); | |
3796 | ||
eb426534 RM |
3797 | this->reset_relax_output(); |
3798 | ||
2e702c99 RM |
3799 | for (Segment_list::iterator p = this->segment_list_.begin(); |
3800 | *p != load_seg; | |
3801 | ++p) | |
3802 | { | |
3803 | if ((*p)->type() == elfcpp::PT_LOAD) | |
3804 | { | |
3805 | // We repeat the whole job of assigning addresses and | |
3806 | // offsets, but we really only want to change the offsets and | |
3807 | // must ensure that the addresses all come out the same as | |
3808 | // they did the first time through. | |
3809 | bool has_relro = false; | |
3810 | const uint64_t old_addr = (*p)->vaddr(); | |
3811 | const uint64_t old_end = old_addr + (*p)->memsz(); | |
eb426534 RM |
3812 | uint64_t new_addr = (*p)->set_section_addresses(target, this, |
3813 | true, old_addr, | |
2e702c99 RM |
3814 | &increase_relro, |
3815 | &has_relro, | |
3816 | &off, | |
3817 | &shndx_begin); | |
3818 | gold_assert(new_addr == old_end); | |
3819 | } | |
3820 | } | |
3821 | ||
3822 | gold_assert(shndx_begin == shndx_load_seg); | |
3823 | } | |
3824 | ||
75f65a3e ILT |
3825 | // Handle the non-PT_LOAD segments, setting their offsets from their |
3826 | // section's offsets. | |
3827 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
3828 | p != this->segment_list_.end(); | |
3829 | ++p) | |
3830 | { | |
1130c90e RM |
3831 | // PT_GNU_STACK was set up correctly when it was created. |
3832 | if ((*p)->type() != elfcpp::PT_LOAD | |
3833 | && (*p)->type() != elfcpp::PT_GNU_STACK) | |
1a2dff53 ILT |
3834 | (*p)->set_offset((*p)->type() == elfcpp::PT_GNU_RELRO |
3835 | ? increase_relro | |
3836 | : 0); | |
75f65a3e ILT |
3837 | } |
3838 | ||
7bf1f802 ILT |
3839 | // Set the TLS offsets for each section in the PT_TLS segment. |
3840 | if (this->tls_segment_ != NULL) | |
3841 | this->tls_segment_->set_tls_offsets(); | |
3842 | ||
75f65a3e ILT |
3843 | return off; |
3844 | } | |
3845 | ||
6a74a719 ILT |
3846 | // Set the offsets of all the allocated sections when doing a |
3847 | // relocatable link. This does the same jobs as set_segment_offsets, | |
3848 | // only for a relocatable link. | |
3849 | ||
3850 | off_t | |
3851 | Layout::set_relocatable_section_offsets(Output_data* file_header, | |
ca09d69a | 3852 | unsigned int* pshndx) |
6a74a719 ILT |
3853 | { |
3854 | off_t off = 0; | |
3855 | ||
3856 | file_header->set_address_and_file_offset(0, 0); | |
3857 | off += file_header->data_size(); | |
3858 | ||
3859 | for (Section_list::iterator p = this->section_list_.begin(); | |
3860 | p != this->section_list_.end(); | |
3861 | ++p) | |
3862 | { | |
3863 | // We skip unallocated sections here, except that group sections | |
3864 | // have to come first. | |
3865 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 | |
3866 | && (*p)->type() != elfcpp::SHT_GROUP) | |
3867 | continue; | |
3868 | ||
3869 | off = align_address(off, (*p)->addralign()); | |
3870 | ||
3871 | // The linker script might have set the address. | |
3872 | if (!(*p)->is_address_valid()) | |
3873 | (*p)->set_address(0); | |
3874 | (*p)->set_file_offset(off); | |
3875 | (*p)->finalize_data_size(); | |
e79c84aa CC |
3876 | if ((*p)->type() != elfcpp::SHT_NOBITS) |
3877 | off += (*p)->data_size(); | |
6a74a719 ILT |
3878 | |
3879 | (*p)->set_out_shndx(*pshndx); | |
3880 | ++*pshndx; | |
3881 | } | |
3882 | ||
3883 | return off; | |
3884 | } | |
3885 | ||
75f65a3e ILT |
3886 | // Set the file offset of all the sections not associated with a |
3887 | // segment. | |
3888 | ||
3889 | off_t | |
9a0910c3 | 3890 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 3891 | { |
cdc29364 CC |
3892 | off_t startoff = off; |
3893 | off_t maxoff = off; | |
3894 | ||
a3ad94ed ILT |
3895 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
3896 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
3897 | ++p) |
3898 | { | |
27bc2bce ILT |
3899 | // The symtab section is handled in create_symtab_sections. |
3900 | if (*p == this->symtab_section_) | |
61ba1cf9 | 3901 | continue; |
27bc2bce | 3902 | |
a9a60db6 ILT |
3903 | // If we've already set the data size, don't set it again. |
3904 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) | |
3905 | continue; | |
3906 | ||
96803768 ILT |
3907 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
3908 | && (*p)->requires_postprocessing()) | |
17a1d0a9 ILT |
3909 | { |
3910 | (*p)->create_postprocessing_buffer(); | |
3911 | this->any_postprocessing_sections_ = true; | |
3912 | } | |
96803768 | 3913 | |
9a0910c3 | 3914 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2e702c99 RM |
3915 | && (*p)->after_input_sections()) |
3916 | continue; | |
17a1d0a9 | 3917 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
2e702c99 RM |
3918 | && (!(*p)->after_input_sections() |
3919 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
3920 | continue; | |
17a1d0a9 | 3921 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
2e702c99 RM |
3922 | && (!(*p)->after_input_sections() |
3923 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
3924 | continue; | |
27bc2bce | 3925 | |
cdc29364 CC |
3926 | if (!parameters->incremental_update()) |
3927 | { | |
3928 | off = align_address(off, (*p)->addralign()); | |
3929 | (*p)->set_file_offset(off); | |
3930 | (*p)->finalize_data_size(); | |
3931 | } | |
3932 | else | |
3933 | { | |
3934 | // Incremental update: allocate file space from free list. | |
3935 | (*p)->pre_finalize_data_size(); | |
3936 | off_t current_size = (*p)->current_data_size(); | |
3937 | off = this->allocate(current_size, (*p)->addralign(), startoff); | |
3938 | if (off == -1) | |
3939 | { | |
3940 | if (is_debugging_enabled(DEBUG_INCREMENTAL)) | |
2e702c99 | 3941 | this->free_list_.dump(); |
cdc29364 | 3942 | gold_assert((*p)->output_section() != NULL); |
e6455dfb CC |
3943 | gold_fallback(_("out of patch space for section %s; " |
3944 | "relink with --incremental-full"), | |
3945 | (*p)->output_section()->name()); | |
cdc29364 CC |
3946 | } |
3947 | (*p)->set_file_offset(off); | |
3948 | (*p)->finalize_data_size(); | |
3949 | if ((*p)->data_size() > current_size) | |
3950 | { | |
3951 | gold_assert((*p)->output_section() != NULL); | |
e6455dfb CC |
3952 | gold_fallback(_("%s: section changed size; " |
3953 | "relink with --incremental-full"), | |
3954 | (*p)->output_section()->name()); | |
cdc29364 CC |
3955 | } |
3956 | gold_debug(DEBUG_INCREMENTAL, | |
3957 | "set_section_offsets: %08lx %08lx %s", | |
3958 | static_cast<long>(off), | |
3959 | static_cast<long>((*p)->data_size()), | |
3960 | ((*p)->output_section() != NULL | |
3961 | ? (*p)->output_section()->name() : "(special)")); | |
3962 | } | |
3963 | ||
75f65a3e | 3964 | off += (*p)->data_size(); |
cdc29364 | 3965 | if (off > maxoff) |
2e702c99 | 3966 | maxoff = off; |
96803768 ILT |
3967 | |
3968 | // At this point the name must be set. | |
17a1d0a9 | 3969 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
96803768 | 3970 | this->namepool_.add((*p)->name(), false, NULL); |
75f65a3e | 3971 | } |
cdc29364 | 3972 | return maxoff; |
75f65a3e ILT |
3973 | } |
3974 | ||
86887060 ILT |
3975 | // Set the section indexes of all the sections not associated with a |
3976 | // segment. | |
3977 | ||
3978 | unsigned int | |
3979 | Layout::set_section_indexes(unsigned int shndx) | |
3980 | { | |
3981 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
3982 | p != this->unattached_section_list_.end(); | |
3983 | ++p) | |
3984 | { | |
d491d34e ILT |
3985 | if (!(*p)->has_out_shndx()) |
3986 | { | |
3987 | (*p)->set_out_shndx(shndx); | |
3988 | ++shndx; | |
3989 | } | |
86887060 ILT |
3990 | } |
3991 | return shndx; | |
3992 | } | |
3993 | ||
a445fddf ILT |
3994 | // Set the section addresses according to the linker script. This is |
3995 | // only called when we see a SECTIONS clause. This returns the | |
3996 | // program segment which should hold the file header and segment | |
3997 | // headers, if any. It will return NULL if they should not be in a | |
3998 | // segment. | |
3999 | ||
4000 | Output_segment* | |
4001 | Layout::set_section_addresses_from_script(Symbol_table* symtab) | |
20e6d0d6 DK |
4002 | { |
4003 | Script_sections* ss = this->script_options_->script_sections(); | |
4004 | gold_assert(ss->saw_sections_clause()); | |
4005 | return this->script_options_->set_section_addresses(symtab, this); | |
4006 | } | |
4007 | ||
4008 | // Place the orphan sections in the linker script. | |
4009 | ||
4010 | void | |
4011 | Layout::place_orphan_sections_in_script() | |
a445fddf ILT |
4012 | { |
4013 | Script_sections* ss = this->script_options_->script_sections(); | |
4014 | gold_assert(ss->saw_sections_clause()); | |
4015 | ||
4016 | // Place each orphaned output section in the script. | |
4017 | for (Section_list::iterator p = this->section_list_.begin(); | |
4018 | p != this->section_list_.end(); | |
4019 | ++p) | |
4020 | { | |
4021 | if (!(*p)->found_in_sections_clause()) | |
4022 | ss->place_orphan(*p); | |
4023 | } | |
a445fddf ILT |
4024 | } |
4025 | ||
7bf1f802 ILT |
4026 | // Count the local symbols in the regular symbol table and the dynamic |
4027 | // symbol table, and build the respective string pools. | |
4028 | ||
4029 | void | |
17a1d0a9 ILT |
4030 | Layout::count_local_symbols(const Task* task, |
4031 | const Input_objects* input_objects) | |
7bf1f802 | 4032 | { |
6d013333 ILT |
4033 | // First, figure out an upper bound on the number of symbols we'll |
4034 | // be inserting into each pool. This helps us create the pools with | |
4035 | // the right size, to avoid unnecessary hashtable resizing. | |
4036 | unsigned int symbol_count = 0; | |
4037 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
4038 | p != input_objects->relobj_end(); | |
4039 | ++p) | |
4040 | symbol_count += (*p)->local_symbol_count(); | |
4041 | ||
4042 | // Go from "upper bound" to "estimate." We overcount for two | |
4043 | // reasons: we double-count symbols that occur in more than one | |
4044 | // object file, and we count symbols that are dropped from the | |
4045 | // output. Add it all together and assume we overcount by 100%. | |
4046 | symbol_count /= 2; | |
4047 | ||
4048 | // We assume all symbols will go into both the sympool and dynpool. | |
4049 | this->sympool_.reserve(symbol_count); | |
4050 | this->dynpool_.reserve(symbol_count); | |
4051 | ||
7bf1f802 ILT |
4052 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
4053 | p != input_objects->relobj_end(); | |
4054 | ++p) | |
4055 | { | |
17a1d0a9 | 4056 | Task_lock_obj<Object> tlo(task, *p); |
7bf1f802 ILT |
4057 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
4058 | } | |
4059 | } | |
4060 | ||
b8e6aad9 ILT |
4061 | // Create the symbol table sections. Here we also set the final |
4062 | // values of the symbols. At this point all the loadable sections are | |
d491d34e | 4063 | // fully laid out. SHNUM is the number of sections so far. |
75f65a3e ILT |
4064 | |
4065 | void | |
9025d29d | 4066 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 4067 | Symbol_table* symtab, |
d491d34e | 4068 | unsigned int shnum, |
c4d5a762 CC |
4069 | off_t* poff, |
4070 | unsigned int local_dynamic_count) | |
75f65a3e | 4071 | { |
61ba1cf9 ILT |
4072 | int symsize; |
4073 | unsigned int align; | |
8851ecca | 4074 | if (parameters->target().get_size() == 32) |
61ba1cf9 ILT |
4075 | { |
4076 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
4077 | align = 4; | |
4078 | } | |
8851ecca | 4079 | else if (parameters->target().get_size() == 64) |
61ba1cf9 ILT |
4080 | { |
4081 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
4082 | align = 8; | |
4083 | } | |
4084 | else | |
a3ad94ed | 4085 | gold_unreachable(); |
61ba1cf9 | 4086 | |
cdc29364 CC |
4087 | // Compute file offsets relative to the start of the symtab section. |
4088 | off_t off = 0; | |
61ba1cf9 ILT |
4089 | |
4090 | // Save space for the dummy symbol at the start of the section. We | |
4091 | // never bother to write this out--it will just be left as zero. | |
4092 | off += symsize; | |
c06b7b0b | 4093 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 4094 | |
a3ad94ed ILT |
4095 | // Add STT_SECTION symbols for each Output section which needs one. |
4096 | for (Section_list::iterator p = this->section_list_.begin(); | |
4097 | p != this->section_list_.end(); | |
4098 | ++p) | |
4099 | { | |
4100 | if (!(*p)->needs_symtab_index()) | |
4101 | (*p)->set_symtab_index(-1U); | |
4102 | else | |
4103 | { | |
4104 | (*p)->set_symtab_index(local_symbol_index); | |
4105 | ++local_symbol_index; | |
4106 | off += symsize; | |
4107 | } | |
4108 | } | |
4109 | ||
f6ce93d6 ILT |
4110 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
4111 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
4112 | ++p) |
4113 | { | |
c06b7b0b | 4114 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
2e702c99 | 4115 | off, symtab); |
c06b7b0b ILT |
4116 | off += (index - local_symbol_index) * symsize; |
4117 | local_symbol_index = index; | |
75f65a3e ILT |
4118 | } |
4119 | ||
c06b7b0b | 4120 | unsigned int local_symcount = local_symbol_index; |
cdc29364 | 4121 | gold_assert(static_cast<off_t>(local_symcount * symsize) == off); |
61ba1cf9 | 4122 | |
16649710 | 4123 | off_t dynoff; |
16649710 ILT |
4124 | size_t dyncount; |
4125 | if (this->dynsym_section_ == NULL) | |
4126 | { | |
4127 | dynoff = 0; | |
16649710 ILT |
4128 | dyncount = 0; |
4129 | } | |
4130 | else | |
4131 | { | |
c4d5a762 | 4132 | off_t locsize = local_dynamic_count * this->dynsym_section_->entsize(); |
16649710 ILT |
4133 | dynoff = this->dynsym_section_->offset() + locsize; |
4134 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 4135 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
4136 | == this->dynsym_section_->data_size() - locsize); |
4137 | } | |
4138 | ||
cdc29364 | 4139 | off_t global_off = off; |
c4d5a762 | 4140 | off = symtab->finalize(off, dynoff, local_dynamic_count, dyncount, |
55a93433 | 4141 | &this->sympool_, &local_symcount); |
75f65a3e | 4142 | |
8851ecca | 4143 | if (!parameters->options().strip_all()) |
9e2dcb77 ILT |
4144 | { |
4145 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 4146 | |
cfd73a4e | 4147 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
4148 | Output_section* osymtab = this->make_output_section(symtab_name, |
4149 | elfcpp::SHT_SYMTAB, | |
22f0da72 ILT |
4150 | 0, ORDER_INVALID, |
4151 | false); | |
9e2dcb77 | 4152 | this->symtab_section_ = osymtab; |
a3ad94ed | 4153 | |
cdc29364 | 4154 | Output_section_data* pos = new Output_data_fixed_space(off, align, |
7d9e3d98 | 4155 | "** symtab"); |
9e2dcb77 | 4156 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 4157 | |
d491d34e ILT |
4158 | // We generate a .symtab_shndx section if we have more than |
4159 | // SHN_LORESERVE sections. Technically it is possible that we | |
4160 | // don't need one, because it is possible that there are no | |
4161 | // symbols in any of sections with indexes larger than | |
4162 | // SHN_LORESERVE. That is probably unusual, though, and it is | |
4163 | // easier to always create one than to compute section indexes | |
4164 | // twice (once here, once when writing out the symbols). | |
4165 | if (shnum >= elfcpp::SHN_LORESERVE) | |
4166 | { | |
4167 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", | |
4168 | false, NULL); | |
4169 | Output_section* osymtab_xindex = | |
4170 | this->make_output_section(symtab_xindex_name, | |
22f0da72 ILT |
4171 | elfcpp::SHT_SYMTAB_SHNDX, 0, |
4172 | ORDER_INVALID, false); | |
d491d34e | 4173 | |
cdc29364 | 4174 | size_t symcount = off / symsize; |
d491d34e ILT |
4175 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); |
4176 | ||
4177 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); | |
4178 | ||
4179 | osymtab_xindex->set_link_section(osymtab); | |
4180 | osymtab_xindex->set_addralign(4); | |
4181 | osymtab_xindex->set_entsize(4); | |
4182 | ||
4183 | osymtab_xindex->set_after_input_sections(); | |
4184 | ||
4185 | // This tells the driver code to wait until the symbol table | |
4186 | // has written out before writing out the postprocessing | |
4187 | // sections, including the .symtab_shndx section. | |
4188 | this->any_postprocessing_sections_ = true; | |
4189 | } | |
4190 | ||
cfd73a4e | 4191 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
4192 | Output_section* ostrtab = this->make_output_section(strtab_name, |
4193 | elfcpp::SHT_STRTAB, | |
22f0da72 ILT |
4194 | 0, ORDER_INVALID, |
4195 | false); | |
a3ad94ed | 4196 | |
9e2dcb77 ILT |
4197 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
4198 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 4199 | |
cdc29364 CC |
4200 | off_t symtab_off; |
4201 | if (!parameters->incremental_update()) | |
4202 | symtab_off = align_address(*poff, align); | |
4203 | else | |
4204 | { | |
4205 | symtab_off = this->allocate(off, align, *poff); | |
2e702c99 | 4206 | if (off == -1) |
e6455dfb CC |
4207 | gold_fallback(_("out of patch space for symbol table; " |
4208 | "relink with --incremental-full")); | |
cdc29364 CC |
4209 | gold_debug(DEBUG_INCREMENTAL, |
4210 | "create_symtab_sections: %08lx %08lx .symtab", | |
4211 | static_cast<long>(symtab_off), | |
4212 | static_cast<long>(off)); | |
4213 | } | |
4214 | ||
4215 | symtab->set_file_offset(symtab_off + global_off); | |
4216 | osymtab->set_file_offset(symtab_off); | |
27bc2bce | 4217 | osymtab->finalize_data_size(); |
9e2dcb77 ILT |
4218 | osymtab->set_link_section(ostrtab); |
4219 | osymtab->set_info(local_symcount); | |
4220 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 4221 | |
cdc29364 CC |
4222 | if (symtab_off + off > *poff) |
4223 | *poff = symtab_off + off; | |
9e2dcb77 | 4224 | } |
75f65a3e ILT |
4225 | } |
4226 | ||
4227 | // Create the .shstrtab section, which holds the names of the | |
4228 | // sections. At the time this is called, we have created all the | |
4229 | // output sections except .shstrtab itself. | |
4230 | ||
4231 | Output_section* | |
4232 | Layout::create_shstrtab() | |
4233 | { | |
4234 | // FIXME: We don't need to create a .shstrtab section if we are | |
4235 | // stripping everything. | |
4236 | ||
cfd73a4e | 4237 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 4238 | |
f5c870d2 | 4239 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0, |
22f0da72 | 4240 | ORDER_INVALID, false); |
75f65a3e | 4241 | |
0e0d5469 ILT |
4242 | if (strcmp(parameters->options().compress_debug_sections(), "none") != 0) |
4243 | { | |
4244 | // We can't write out this section until we've set all the | |
4245 | // section names, and we don't set the names of compressed | |
4246 | // output sections until relocations are complete. FIXME: With | |
4247 | // the current names we use, this is unnecessary. | |
4248 | os->set_after_input_sections(); | |
4249 | } | |
27bc2bce | 4250 | |
a3ad94ed ILT |
4251 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
4252 | os->add_output_section_data(posd); | |
75f65a3e ILT |
4253 | |
4254 | return os; | |
4255 | } | |
4256 | ||
4257 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
4258 | // offset. | |
4259 | ||
27bc2bce | 4260 | void |
d491d34e | 4261 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
75f65a3e ILT |
4262 | { |
4263 | Output_section_headers* oshdrs; | |
9025d29d | 4264 | oshdrs = new Output_section_headers(this, |
16649710 | 4265 | &this->segment_list_, |
6a74a719 | 4266 | &this->section_list_, |
16649710 | 4267 | &this->unattached_section_list_, |
d491d34e ILT |
4268 | &this->namepool_, |
4269 | shstrtab_section); | |
cdc29364 CC |
4270 | off_t off; |
4271 | if (!parameters->incremental_update()) | |
4272 | off = align_address(*poff, oshdrs->addralign()); | |
4273 | else | |
4274 | { | |
4275 | oshdrs->pre_finalize_data_size(); | |
4276 | off = this->allocate(oshdrs->data_size(), oshdrs->addralign(), *poff); | |
4277 | if (off == -1) | |
e6455dfb CC |
4278 | gold_fallback(_("out of patch space for section header table; " |
4279 | "relink with --incremental-full")); | |
cdc29364 CC |
4280 | gold_debug(DEBUG_INCREMENTAL, |
4281 | "create_shdrs: %08lx %08lx (section header table)", | |
4282 | static_cast<long>(off), | |
4283 | static_cast<long>(off + oshdrs->data_size())); | |
4284 | } | |
27bc2bce | 4285 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 | 4286 | off += oshdrs->data_size(); |
cdc29364 CC |
4287 | if (off > *poff) |
4288 | *poff = off; | |
27bc2bce | 4289 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
4290 | } |
4291 | ||
d491d34e ILT |
4292 | // Count the allocated sections. |
4293 | ||
4294 | size_t | |
4295 | Layout::allocated_output_section_count() const | |
4296 | { | |
4297 | size_t section_count = 0; | |
4298 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4299 | p != this->segment_list_.end(); | |
4300 | ++p) | |
4301 | section_count += (*p)->output_section_count(); | |
4302 | return section_count; | |
4303 | } | |
4304 | ||
dbe717ef | 4305 | // Create the dynamic symbol table. |
c4d5a762 CC |
4306 | // *PLOCAL_DYNAMIC_COUNT will be set to the number of local symbols |
4307 | // from input objects, and *PFORCED_LOCAL_DYNAMIC_COUNT will be set | |
4308 | // to the number of global symbols that have been forced local. | |
4309 | // We need to remember the former because the forced-local symbols are | |
4310 | // written along with the global symbols in Symtab::write_globals(). | |
dbe717ef ILT |
4311 | |
4312 | void | |
7bf1f802 | 4313 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
2e702c99 | 4314 | Symbol_table* symtab, |
ca09d69a | 4315 | Output_section** pdynstr, |
14b31740 | 4316 | unsigned int* plocal_dynamic_count, |
c4d5a762 | 4317 | unsigned int* pforced_local_dynamic_count, |
14b31740 ILT |
4318 | std::vector<Symbol*>* pdynamic_symbols, |
4319 | Versions* pversions) | |
dbe717ef | 4320 | { |
a3ad94ed ILT |
4321 | // Count all the symbols in the dynamic symbol table, and set the |
4322 | // dynamic symbol indexes. | |
dbe717ef | 4323 | |
a3ad94ed ILT |
4324 | // Skip symbol 0, which is always all zeroes. |
4325 | unsigned int index = 1; | |
dbe717ef | 4326 | |
a3ad94ed ILT |
4327 | // Add STT_SECTION symbols for each Output section which needs one. |
4328 | for (Section_list::iterator p = this->section_list_.begin(); | |
4329 | p != this->section_list_.end(); | |
4330 | ++p) | |
4331 | { | |
4332 | if (!(*p)->needs_dynsym_index()) | |
4333 | (*p)->set_dynsym_index(-1U); | |
4334 | else | |
4335 | { | |
4336 | (*p)->set_dynsym_index(index); | |
4337 | ++index; | |
4338 | } | |
4339 | } | |
4340 | ||
7bf1f802 ILT |
4341 | // Count the local symbols that need to go in the dynamic symbol table, |
4342 | // and set the dynamic symbol indexes. | |
4343 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
4344 | p != input_objects->relobj_end(); | |
4345 | ++p) | |
4346 | { | |
4347 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
4348 | index = new_index; | |
4349 | } | |
a3ad94ed ILT |
4350 | |
4351 | unsigned int local_symcount = index; | |
c4d5a762 | 4352 | unsigned int forced_local_count = 0; |
a3ad94ed | 4353 | |
c4d5a762 CC |
4354 | index = symtab->set_dynsym_indexes(index, &forced_local_count, |
4355 | pdynamic_symbols, &this->dynpool_, | |
4356 | pversions); | |
4357 | ||
4358 | *plocal_dynamic_count = local_symcount; | |
4359 | *pforced_local_dynamic_count = forced_local_count; | |
a3ad94ed ILT |
4360 | |
4361 | int symsize; | |
4362 | unsigned int align; | |
8851ecca | 4363 | const int size = parameters->target().get_size(); |
a3ad94ed ILT |
4364 | if (size == 32) |
4365 | { | |
4366 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
4367 | align = 4; | |
4368 | } | |
4369 | else if (size == 64) | |
4370 | { | |
4371 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
4372 | align = 8; | |
4373 | } | |
4374 | else | |
4375 | gold_unreachable(); | |
4376 | ||
14b31740 ILT |
4377 | // Create the dynamic symbol table section. |
4378 | ||
3802b2dd ILT |
4379 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
4380 | elfcpp::SHT_DYNSYM, | |
4381 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
4382 | false, |
4383 | ORDER_DYNAMIC_LINKER, | |
412ffd83 | 4384 | false, false, false); |
a3ad94ed | 4385 | |
6daf5215 ILT |
4386 | // Check for NULL as a linker script may discard .dynsym. |
4387 | if (dynsym != NULL) | |
4388 | { | |
4389 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, | |
4390 | align, | |
4391 | "** dynsym"); | |
4392 | dynsym->add_output_section_data(odata); | |
a3ad94ed | 4393 | |
c4d5a762 | 4394 | dynsym->set_info(local_symcount + forced_local_count); |
6daf5215 ILT |
4395 | dynsym->set_entsize(symsize); |
4396 | dynsym->set_addralign(align); | |
a3ad94ed | 4397 | |
6daf5215 ILT |
4398 | this->dynsym_section_ = dynsym; |
4399 | } | |
a3ad94ed | 4400 | |
16649710 | 4401 | Output_data_dynamic* const odyn = this->dynamic_data_; |
6daf5215 ILT |
4402 | if (odyn != NULL) |
4403 | { | |
4404 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); | |
4405 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
4406 | } | |
a3ad94ed | 4407 | |
d491d34e ILT |
4408 | // If there are more than SHN_LORESERVE allocated sections, we |
4409 | // create a .dynsym_shndx section. It is possible that we don't | |
4410 | // need one, because it is possible that there are no dynamic | |
4411 | // symbols in any of the sections with indexes larger than | |
4412 | // SHN_LORESERVE. This is probably unusual, though, and at this | |
4413 | // time we don't know the actual section indexes so it is | |
4414 | // inconvenient to check. | |
4415 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) | |
4416 | { | |
2ea97941 | 4417 | Output_section* dynsym_xindex = |
d491d34e ILT |
4418 | this->choose_output_section(NULL, ".dynsym_shndx", |
4419 | elfcpp::SHT_SYMTAB_SHNDX, | |
4420 | elfcpp::SHF_ALLOC, | |
412ffd83 CC |
4421 | false, ORDER_DYNAMIC_LINKER, false, false, |
4422 | false); | |
d491d34e | 4423 | |
6daf5215 ILT |
4424 | if (dynsym_xindex != NULL) |
4425 | { | |
4426 | this->dynsym_xindex_ = new Output_symtab_xindex(index); | |
d491d34e | 4427 | |
6daf5215 | 4428 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); |
d491d34e | 4429 | |
6daf5215 ILT |
4430 | dynsym_xindex->set_link_section(dynsym); |
4431 | dynsym_xindex->set_addralign(4); | |
4432 | dynsym_xindex->set_entsize(4); | |
d491d34e | 4433 | |
6daf5215 | 4434 | dynsym_xindex->set_after_input_sections(); |
d491d34e | 4435 | |
6daf5215 ILT |
4436 | // This tells the driver code to wait until the symbol table |
4437 | // has written out before writing out the postprocessing | |
4438 | // sections, including the .dynsym_shndx section. | |
4439 | this->any_postprocessing_sections_ = true; | |
4440 | } | |
d491d34e ILT |
4441 | } |
4442 | ||
14b31740 ILT |
4443 | // Create the dynamic string table section. |
4444 | ||
3802b2dd ILT |
4445 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
4446 | elfcpp::SHT_STRTAB, | |
4447 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
4448 | false, |
4449 | ORDER_DYNAMIC_LINKER, | |
412ffd83 | 4450 | false, false, false); |
117be58f | 4451 | *pdynstr = dynstr; |
6daf5215 ILT |
4452 | if (dynstr != NULL) |
4453 | { | |
4454 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
4455 | dynstr->add_output_section_data(strdata); | |
a3ad94ed | 4456 | |
6daf5215 ILT |
4457 | if (dynsym != NULL) |
4458 | dynsym->set_link_section(dynstr); | |
4459 | if (this->dynamic_section_ != NULL) | |
4460 | this->dynamic_section_->set_link_section(dynstr); | |
16649710 | 4461 | |
6daf5215 ILT |
4462 | if (odyn != NULL) |
4463 | { | |
4464 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); | |
4465 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
4466 | } | |
6daf5215 | 4467 | } |
14b31740 | 4468 | |
cd6da036 KC |
4469 | // Create the hash tables. The Gnu-style hash table must be |
4470 | // built first, because it changes the order of the symbols | |
4471 | // in the dynamic symbol table. | |
14b31740 | 4472 | |
cd6da036 | 4473 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 |
13670ee6 ILT |
4474 | || strcmp(parameters->options().hash_style(), "both") == 0) |
4475 | { | |
4476 | unsigned char* phash; | |
4477 | unsigned int hashlen; | |
c4d5a762 CC |
4478 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, |
4479 | local_symcount + forced_local_count, | |
13670ee6 ILT |
4480 | &phash, &hashlen); |
4481 | ||
22f0da72 | 4482 | Output_section* hashsec = |
cd6da036 | 4483 | this->choose_output_section(NULL, ".gnu.hash", elfcpp::SHT_GNU_HASH, |
22f0da72 | 4484 | elfcpp::SHF_ALLOC, false, |
412ffd83 CC |
4485 | ORDER_DYNAMIC_LINKER, false, false, |
4486 | false); | |
13670ee6 ILT |
4487 | |
4488 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
4489 | hashlen, | |
7d9e3d98 ILT |
4490 | align, |
4491 | "** hash"); | |
6daf5215 ILT |
4492 | if (hashsec != NULL && hashdata != NULL) |
4493 | hashsec->add_output_section_data(hashdata); | |
13670ee6 | 4494 | |
6daf5215 ILT |
4495 | if (hashsec != NULL) |
4496 | { | |
4497 | if (dynsym != NULL) | |
4498 | hashsec->set_link_section(dynsym); | |
a3ad94ed | 4499 | |
cd6da036 KC |
4500 | // For a 64-bit target, the entries in .gnu.hash do not have |
4501 | // a uniform size, so we only set the entry size for a | |
4502 | // 32-bit target. | |
4503 | if (parameters->target().get_size() == 32) | |
4504 | hashsec->set_entsize(4); | |
4505 | ||
4506 | if (odyn != NULL) | |
4507 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); | |
4508 | } | |
13670ee6 ILT |
4509 | } |
4510 | ||
cd6da036 | 4511 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
13670ee6 ILT |
4512 | || strcmp(parameters->options().hash_style(), "both") == 0) |
4513 | { | |
4514 | unsigned char* phash; | |
4515 | unsigned int hashlen; | |
c4d5a762 CC |
4516 | Dynobj::create_elf_hash_table(*pdynamic_symbols, |
4517 | local_symcount + forced_local_count, | |
13670ee6 | 4518 | &phash, &hashlen); |
a3ad94ed | 4519 | |
22f0da72 | 4520 | Output_section* hashsec = |
cd6da036 | 4521 | this->choose_output_section(NULL, ".hash", elfcpp::SHT_HASH, |
22f0da72 | 4522 | elfcpp::SHF_ALLOC, false, |
412ffd83 CC |
4523 | ORDER_DYNAMIC_LINKER, false, false, |
4524 | false); | |
a3ad94ed | 4525 | |
13670ee6 ILT |
4526 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
4527 | hashlen, | |
7d9e3d98 ILT |
4528 | align, |
4529 | "** hash"); | |
6daf5215 ILT |
4530 | if (hashsec != NULL && hashdata != NULL) |
4531 | hashsec->add_output_section_data(hashdata); | |
a3ad94ed | 4532 | |
6daf5215 ILT |
4533 | if (hashsec != NULL) |
4534 | { | |
4535 | if (dynsym != NULL) | |
4536 | hashsec->set_link_section(dynsym); | |
8d9743bd | 4537 | hashsec->set_entsize(parameters->target().hash_entry_size() / 8); |
6daf5215 | 4538 | } |
cd6da036 KC |
4539 | |
4540 | if (odyn != NULL) | |
4541 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); | |
13670ee6 | 4542 | } |
dbe717ef ILT |
4543 | } |
4544 | ||
7bf1f802 ILT |
4545 | // Assign offsets to each local portion of the dynamic symbol table. |
4546 | ||
4547 | void | |
4548 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
4549 | { | |
4550 | Output_section* dynsym = this->dynsym_section_; | |
6daf5215 ILT |
4551 | if (dynsym == NULL) |
4552 | return; | |
7bf1f802 ILT |
4553 | |
4554 | off_t off = dynsym->offset(); | |
4555 | ||
4556 | // Skip the dummy symbol at the start of the section. | |
4557 | off += dynsym->entsize(); | |
4558 | ||
4559 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
4560 | p != input_objects->relobj_end(); | |
4561 | ++p) | |
4562 | { | |
4563 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
4564 | off += count * dynsym->entsize(); | |
4565 | } | |
4566 | } | |
4567 | ||
14b31740 ILT |
4568 | // Create the version sections. |
4569 | ||
4570 | void | |
9025d29d | 4571 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 4572 | const Symbol_table* symtab, |
14b31740 ILT |
4573 | unsigned int local_symcount, |
4574 | const std::vector<Symbol*>& dynamic_symbols, | |
4575 | const Output_section* dynstr) | |
4576 | { | |
4577 | if (!versions->any_defs() && !versions->any_needs()) | |
4578 | return; | |
4579 | ||
8851ecca | 4580 | switch (parameters->size_and_endianness()) |
14b31740 | 4581 | { |
193a53d9 | 4582 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 4583 | case Parameters::TARGET_32_LITTLE: |
7d1a9ebb ILT |
4584 | this->sized_create_version_sections<32, false>(versions, symtab, |
4585 | local_symcount, | |
4586 | dynamic_symbols, dynstr); | |
8851ecca | 4587 | break; |
193a53d9 | 4588 | #endif |
8851ecca ILT |
4589 | #ifdef HAVE_TARGET_32_BIG |
4590 | case Parameters::TARGET_32_BIG: | |
7d1a9ebb ILT |
4591 | this->sized_create_version_sections<32, true>(versions, symtab, |
4592 | local_symcount, | |
4593 | dynamic_symbols, dynstr); | |
8851ecca | 4594 | break; |
193a53d9 | 4595 | #endif |
193a53d9 | 4596 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 4597 | case Parameters::TARGET_64_LITTLE: |
7d1a9ebb ILT |
4598 | this->sized_create_version_sections<64, false>(versions, symtab, |
4599 | local_symcount, | |
4600 | dynamic_symbols, dynstr); | |
8851ecca | 4601 | break; |
193a53d9 | 4602 | #endif |
8851ecca ILT |
4603 | #ifdef HAVE_TARGET_64_BIG |
4604 | case Parameters::TARGET_64_BIG: | |
7d1a9ebb ILT |
4605 | this->sized_create_version_sections<64, true>(versions, symtab, |
4606 | local_symcount, | |
4607 | dynamic_symbols, dynstr); | |
8851ecca ILT |
4608 | break; |
4609 | #endif | |
4610 | default: | |
4611 | gold_unreachable(); | |
14b31740 | 4612 | } |
14b31740 ILT |
4613 | } |
4614 | ||
4615 | // Create the version sections, sized version. | |
4616 | ||
4617 | template<int size, bool big_endian> | |
4618 | void | |
4619 | Layout::sized_create_version_sections( | |
4620 | const Versions* versions, | |
46fe1623 | 4621 | const Symbol_table* symtab, |
14b31740 ILT |
4622 | unsigned int local_symcount, |
4623 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 4624 | const Output_section* dynstr) |
14b31740 | 4625 | { |
3802b2dd ILT |
4626 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
4627 | elfcpp::SHT_GNU_versym, | |
4628 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
4629 | false, |
4630 | ORDER_DYNAMIC_LINKER, | |
412ffd83 | 4631 | false, false, false); |
14b31740 | 4632 | |
6daf5215 ILT |
4633 | // Check for NULL since a linker script may discard this section. |
4634 | if (vsec != NULL) | |
4635 | { | |
4636 | unsigned char* vbuf; | |
4637 | unsigned int vsize; | |
4638 | versions->symbol_section_contents<size, big_endian>(symtab, | |
4639 | &this->dynpool_, | |
4640 | local_symcount, | |
4641 | dynamic_symbols, | |
4642 | &vbuf, &vsize); | |
4643 | ||
4644 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, | |
4645 | "** versions"); | |
4646 | ||
4647 | vsec->add_output_section_data(vdata); | |
4648 | vsec->set_entsize(2); | |
4649 | vsec->set_link_section(this->dynsym_section_); | |
4650 | } | |
14b31740 ILT |
4651 | |
4652 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
6daf5215 ILT |
4653 | if (odyn != NULL && vsec != NULL) |
4654 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
14b31740 ILT |
4655 | |
4656 | if (versions->any_defs()) | |
4657 | { | |
3802b2dd | 4658 | Output_section* vdsec; |
6daf5215 ILT |
4659 | vdsec = this->choose_output_section(NULL, ".gnu.version_d", |
4660 | elfcpp::SHT_GNU_verdef, | |
4661 | elfcpp::SHF_ALLOC, | |
03fb64f8 | 4662 | false, ORDER_DYNAMIC_LINKER, false, |
412ffd83 | 4663 | false, false); |
6daf5215 ILT |
4664 | |
4665 | if (vdsec != NULL) | |
4666 | { | |
4667 | unsigned char* vdbuf; | |
4668 | unsigned int vdsize; | |
4669 | unsigned int vdentries; | |
4670 | versions->def_section_contents<size, big_endian>(&this->dynpool_, | |
4671 | &vdbuf, &vdsize, | |
4672 | &vdentries); | |
4673 | ||
4674 | Output_section_data* vddata = | |
4675 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); | |
4676 | ||
4677 | vdsec->add_output_section_data(vddata); | |
4678 | vdsec->set_link_section(dynstr); | |
4679 | vdsec->set_info(vdentries); | |
4680 | ||
4681 | if (odyn != NULL) | |
4682 | { | |
4683 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
4684 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
4685 | } | |
4686 | } | |
14b31740 ILT |
4687 | } |
4688 | ||
4689 | if (versions->any_needs()) | |
4690 | { | |
14b31740 | 4691 | Output_section* vnsec; |
3802b2dd ILT |
4692 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
4693 | elfcpp::SHT_GNU_verneed, | |
4694 | elfcpp::SHF_ALLOC, | |
03fb64f8 | 4695 | false, ORDER_DYNAMIC_LINKER, false, |
412ffd83 | 4696 | false, false); |
14b31740 | 4697 | |
6daf5215 ILT |
4698 | if (vnsec != NULL) |
4699 | { | |
4700 | unsigned char* vnbuf; | |
4701 | unsigned int vnsize; | |
4702 | unsigned int vnentries; | |
4703 | versions->need_section_contents<size, big_endian>(&this->dynpool_, | |
4704 | &vnbuf, &vnsize, | |
4705 | &vnentries); | |
14b31740 | 4706 | |
6daf5215 ILT |
4707 | Output_section_data* vndata = |
4708 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); | |
14b31740 | 4709 | |
6daf5215 ILT |
4710 | vnsec->add_output_section_data(vndata); |
4711 | vnsec->set_link_section(dynstr); | |
4712 | vnsec->set_info(vnentries); | |
14b31740 | 4713 | |
6daf5215 ILT |
4714 | if (odyn != NULL) |
4715 | { | |
4716 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
4717 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
4718 | } | |
4719 | } | |
14b31740 ILT |
4720 | } |
4721 | } | |
4722 | ||
dbe717ef ILT |
4723 | // Create the .interp section and PT_INTERP segment. |
4724 | ||
4725 | void | |
4726 | Layout::create_interp(const Target* target) | |
4727 | { | |
10b4f102 ILT |
4728 | gold_assert(this->interp_segment_ == NULL); |
4729 | ||
e55bde5e | 4730 | const char* interp = parameters->options().dynamic_linker(); |
dbe717ef ILT |
4731 | if (interp == NULL) |
4732 | { | |
4733 | interp = target->dynamic_linker(); | |
a3ad94ed | 4734 | gold_assert(interp != NULL); |
dbe717ef ILT |
4735 | } |
4736 | ||
4737 | size_t len = strlen(interp) + 1; | |
4738 | ||
4739 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
4740 | ||
e1f74f98 ILT |
4741 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
4742 | elfcpp::SHT_PROGBITS, | |
4743 | elfcpp::SHF_ALLOC, | |
4744 | false, ORDER_INTERP, | |
412ffd83 | 4745 | false, false, false); |
6daf5215 ILT |
4746 | if (osec != NULL) |
4747 | osec->add_output_section_data(odata); | |
dbe717ef ILT |
4748 | } |
4749 | ||
ea715a34 ILT |
4750 | // Add dynamic tags for the PLT and the dynamic relocs. This is |
4751 | // called by the target-specific code. This does nothing if not doing | |
4752 | // a dynamic link. | |
4753 | ||
4754 | // USE_REL is true for REL relocs rather than RELA relocs. | |
4755 | ||
4756 | // If PLT_GOT is not NULL, then DT_PLTGOT points to it. | |
4757 | ||
4758 | // If PLT_REL is not NULL, it is used for DT_PLTRELSZ, and DT_JMPREL, | |
e291e7b9 ILT |
4759 | // and we also set DT_PLTREL. We use PLT_REL's output section, since |
4760 | // some targets have multiple reloc sections in PLT_REL. | |
ea715a34 ILT |
4761 | |
4762 | // If DYN_REL is not NULL, it is used for DT_REL/DT_RELA, | |
67181c72 ILT |
4763 | // DT_RELSZ/DT_RELASZ, DT_RELENT/DT_RELAENT. Again we use the output |
4764 | // section. | |
ea715a34 ILT |
4765 | |
4766 | // If ADD_DEBUG is true, we add a DT_DEBUG entry when generating an | |
4767 | // executable. | |
4768 | ||
4769 | void | |
4770 | Layout::add_target_dynamic_tags(bool use_rel, const Output_data* plt_got, | |
4771 | const Output_data* plt_rel, | |
3a44184e | 4772 | const Output_data_reloc_generic* dyn_rel, |
612a8d3d | 4773 | bool add_debug, bool dynrel_includes_plt) |
ea715a34 ILT |
4774 | { |
4775 | Output_data_dynamic* odyn = this->dynamic_data_; | |
4776 | if (odyn == NULL) | |
4777 | return; | |
4778 | ||
4779 | if (plt_got != NULL && plt_got->output_section() != NULL) | |
4780 | odyn->add_section_address(elfcpp::DT_PLTGOT, plt_got); | |
4781 | ||
4782 | if (plt_rel != NULL && plt_rel->output_section() != NULL) | |
4783 | { | |
e291e7b9 ILT |
4784 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, plt_rel->output_section()); |
4785 | odyn->add_section_address(elfcpp::DT_JMPREL, plt_rel->output_section()); | |
ea715a34 ILT |
4786 | odyn->add_constant(elfcpp::DT_PLTREL, |
4787 | use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA); | |
4788 | } | |
4789 | ||
82435b3b ILT |
4790 | if ((dyn_rel != NULL && dyn_rel->output_section() != NULL) |
4791 | || (dynrel_includes_plt | |
4792 | && plt_rel != NULL | |
4793 | && plt_rel->output_section() != NULL)) | |
ea715a34 | 4794 | { |
82435b3b ILT |
4795 | bool have_dyn_rel = dyn_rel != NULL && dyn_rel->output_section() != NULL; |
4796 | bool have_plt_rel = plt_rel != NULL && plt_rel->output_section() != NULL; | |
ea715a34 | 4797 | odyn->add_section_address(use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA, |
82435b3b ILT |
4798 | (have_dyn_rel |
4799 | ? dyn_rel->output_section() | |
4800 | : plt_rel->output_section())); | |
4801 | elfcpp::DT size_tag = use_rel ? elfcpp::DT_RELSZ : elfcpp::DT_RELASZ; | |
4802 | if (have_dyn_rel && have_plt_rel && dynrel_includes_plt) | |
4803 | odyn->add_section_size(size_tag, | |
67181c72 ILT |
4804 | dyn_rel->output_section(), |
4805 | plt_rel->output_section()); | |
82435b3b ILT |
4806 | else if (have_dyn_rel) |
4807 | odyn->add_section_size(size_tag, dyn_rel->output_section()); | |
612a8d3d | 4808 | else |
82435b3b | 4809 | odyn->add_section_size(size_tag, plt_rel->output_section()); |
ea715a34 ILT |
4810 | const int size = parameters->target().get_size(); |
4811 | elfcpp::DT rel_tag; | |
4812 | int rel_size; | |
4813 | if (use_rel) | |
4814 | { | |
4815 | rel_tag = elfcpp::DT_RELENT; | |
4816 | if (size == 32) | |
4817 | rel_size = Reloc_types<elfcpp::SHT_REL, 32, false>::reloc_size; | |
4818 | else if (size == 64) | |
4819 | rel_size = Reloc_types<elfcpp::SHT_REL, 64, false>::reloc_size; | |
4820 | else | |
4821 | gold_unreachable(); | |
4822 | } | |
4823 | else | |
4824 | { | |
4825 | rel_tag = elfcpp::DT_RELAENT; | |
4826 | if (size == 32) | |
4827 | rel_size = Reloc_types<elfcpp::SHT_RELA, 32, false>::reloc_size; | |
4828 | else if (size == 64) | |
4829 | rel_size = Reloc_types<elfcpp::SHT_RELA, 64, false>::reloc_size; | |
4830 | else | |
4831 | gold_unreachable(); | |
4832 | } | |
4833 | odyn->add_constant(rel_tag, rel_size); | |
3a44184e | 4834 | |
82435b3b | 4835 | if (parameters->options().combreloc() && have_dyn_rel) |
3a44184e ILT |
4836 | { |
4837 | size_t c = dyn_rel->relative_reloc_count(); | |
4838 | if (c > 0) | |
4839 | odyn->add_constant((use_rel | |
4840 | ? elfcpp::DT_RELCOUNT | |
4841 | : elfcpp::DT_RELACOUNT), | |
4842 | c); | |
4843 | } | |
ea715a34 ILT |
4844 | } |
4845 | ||
4846 | if (add_debug && !parameters->options().shared()) | |
4847 | { | |
4848 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
4849 | // linker at run time, and used by the debugger. | |
4850 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
4851 | } | |
4852 | } | |
4853 | ||
dc1c8a16 CC |
4854 | void |
4855 | Layout::add_target_specific_dynamic_tag(elfcpp::DT tag, unsigned int val) | |
4856 | { | |
4857 | Output_data_dynamic* odyn = this->dynamic_data_; | |
4858 | if (odyn == NULL) | |
4859 | return; | |
4860 | odyn->add_constant(tag, val); | |
4861 | } | |
4862 | ||
a3ad94ed ILT |
4863 | // Finish the .dynamic section and PT_DYNAMIC segment. |
4864 | ||
4865 | void | |
4866 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 4867 | const Symbol_table* symtab) |
a3ad94ed | 4868 | { |
6daf5215 ILT |
4869 | if (!this->script_options_->saw_phdrs_clause() |
4870 | && this->dynamic_section_ != NULL) | |
1c4f3631 ILT |
4871 | { |
4872 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, | |
4873 | (elfcpp::PF_R | |
4874 | | elfcpp::PF_W)); | |
22f0da72 ILT |
4875 | oseg->add_output_section_to_nonload(this->dynamic_section_, |
4876 | elfcpp::PF_R | elfcpp::PF_W); | |
1c4f3631 | 4877 | } |
a3ad94ed | 4878 | |
16649710 | 4879 | Output_data_dynamic* const odyn = this->dynamic_data_; |
6daf5215 ILT |
4880 | if (odyn == NULL) |
4881 | return; | |
16649710 | 4882 | |
a3ad94ed ILT |
4883 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
4884 | p != input_objects->dynobj_end(); | |
4885 | ++p) | |
4886 | { | |
0f1c85a6 | 4887 | if (!(*p)->is_needed() && (*p)->as_needed()) |
594c8e5e ILT |
4888 | { |
4889 | // This dynamic object was linked with --as-needed, but it | |
4890 | // is not needed. | |
4891 | continue; | |
4892 | } | |
4893 | ||
a3ad94ed ILT |
4894 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); |
4895 | } | |
4896 | ||
8851ecca | 4897 | if (parameters->options().shared()) |
fced7afd | 4898 | { |
e55bde5e | 4899 | const char* soname = parameters->options().soname(); |
fced7afd ILT |
4900 | if (soname != NULL) |
4901 | odyn->add_string(elfcpp::DT_SONAME, soname); | |
4902 | } | |
4903 | ||
c6585162 | 4904 | Symbol* sym = symtab->lookup(parameters->options().init()); |
14b31740 | 4905 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
4906 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
4907 | ||
c6585162 | 4908 | sym = symtab->lookup(parameters->options().fini()); |
14b31740 | 4909 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
4910 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
4911 | ||
f15f61a7 DK |
4912 | // Look for .init_array, .preinit_array and .fini_array by checking |
4913 | // section types. | |
4914 | for(Layout::Section_list::const_iterator p = this->section_list_.begin(); | |
4915 | p != this->section_list_.end(); | |
4916 | ++p) | |
4917 | switch((*p)->type()) | |
4918 | { | |
4919 | case elfcpp::SHT_FINI_ARRAY: | |
4920 | odyn->add_section_address(elfcpp::DT_FINI_ARRAY, *p); | |
2e702c99 | 4921 | odyn->add_section_size(elfcpp::DT_FINI_ARRAYSZ, *p); |
f15f61a7 DK |
4922 | break; |
4923 | case elfcpp::SHT_INIT_ARRAY: | |
4924 | odyn->add_section_address(elfcpp::DT_INIT_ARRAY, *p); | |
2e702c99 | 4925 | odyn->add_section_size(elfcpp::DT_INIT_ARRAYSZ, *p); |
f15f61a7 DK |
4926 | break; |
4927 | case elfcpp::SHT_PREINIT_ARRAY: | |
4928 | odyn->add_section_address(elfcpp::DT_PREINIT_ARRAY, *p); | |
2e702c99 | 4929 | odyn->add_section_size(elfcpp::DT_PREINIT_ARRAYSZ, *p); |
f15f61a7 DK |
4930 | break; |
4931 | default: | |
4932 | break; | |
4933 | } | |
2e702c99 | 4934 | |
41f542e7 | 4935 | // Add a DT_RPATH entry if needed. |
e55bde5e | 4936 | const General_options::Dir_list& rpath(parameters->options().rpath()); |
41f542e7 ILT |
4937 | if (!rpath.empty()) |
4938 | { | |
4939 | std::string rpath_val; | |
4940 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
2e702c99 RM |
4941 | p != rpath.end(); |
4942 | ++p) | |
4943 | { | |
4944 | if (rpath_val.empty()) | |
4945 | rpath_val = p->name(); | |
4946 | else | |
4947 | { | |
4948 | // Eliminate duplicates. | |
4949 | General_options::Dir_list::const_iterator q; | |
4950 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 4951 | if (q->name() == p->name()) |
2e702c99 RM |
4952 | break; |
4953 | if (q == p) | |
4954 | { | |
4955 | rpath_val += ':'; | |
4956 | rpath_val += p->name(); | |
4957 | } | |
4958 | } | |
4959 | } | |
41f542e7 | 4960 | |
b1b00fcc MF |
4961 | if (!parameters->options().enable_new_dtags()) |
4962 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
4963 | else | |
7c414435 | 4964 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); |
41f542e7 | 4965 | } |
4f4c5f80 ILT |
4966 | |
4967 | // Look for text segments that have dynamic relocations. | |
4968 | bool have_textrel = false; | |
4e8fe71f | 4969 | if (!this->script_options_->saw_sections_clause()) |
4f4c5f80 | 4970 | { |
4e8fe71f | 4971 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
2e702c99 RM |
4972 | p != this->segment_list_.end(); |
4973 | ++p) | |
4974 | { | |
4975 | if ((*p)->type() == elfcpp::PT_LOAD | |
766f91bb | 4976 | && ((*p)->flags() & elfcpp::PF_W) == 0 |
2e702c99 RM |
4977 | && (*p)->has_dynamic_reloc()) |
4978 | { | |
4979 | have_textrel = true; | |
4980 | break; | |
4981 | } | |
4982 | } | |
4e8fe71f ILT |
4983 | } |
4984 | else | |
4985 | { | |
4986 | // We don't know the section -> segment mapping, so we are | |
4987 | // conservative and just look for readonly sections with | |
4988 | // relocations. If those sections wind up in writable segments, | |
4989 | // then we have created an unnecessary DT_TEXTREL entry. | |
4990 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
2e702c99 RM |
4991 | p != this->section_list_.end(); |
4992 | ++p) | |
4993 | { | |
4994 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 | |
4995 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 | |
4996 | && (*p)->has_dynamic_reloc()) | |
4997 | { | |
4998 | have_textrel = true; | |
4999 | break; | |
5000 | } | |
5001 | } | |
4f4c5f80 ILT |
5002 | } |
5003 | ||
886288f1 ILT |
5004 | if (parameters->options().filter() != NULL) |
5005 | odyn->add_string(elfcpp::DT_FILTER, parameters->options().filter()); | |
5006 | if (parameters->options().any_auxiliary()) | |
5007 | { | |
5008 | for (options::String_set::const_iterator p = | |
5009 | parameters->options().auxiliary_begin(); | |
5010 | p != parameters->options().auxiliary_end(); | |
5011 | ++p) | |
5012 | odyn->add_string(elfcpp::DT_AUXILIARY, *p); | |
5013 | } | |
5014 | ||
5015 | // Add a DT_FLAGS entry if necessary. | |
4f4c5f80 ILT |
5016 | unsigned int flags = 0; |
5017 | if (have_textrel) | |
6a41d30b ILT |
5018 | { |
5019 | // Add a DT_TEXTREL for compatibility with older loaders. | |
5020 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
5021 | flags |= elfcpp::DF_TEXTREL; | |
b9674e17 | 5022 | |
ffeef7df ILT |
5023 | if (parameters->options().text()) |
5024 | gold_error(_("read-only segment has dynamic relocations")); | |
5025 | else if (parameters->options().warn_shared_textrel() | |
5026 | && parameters->options().shared()) | |
b9674e17 | 5027 | gold_warning(_("shared library text segment is not shareable")); |
6a41d30b | 5028 | } |
8851ecca | 5029 | if (parameters->options().shared() && this->has_static_tls()) |
535890bb | 5030 | flags |= elfcpp::DF_STATIC_TLS; |
7be8330a CD |
5031 | if (parameters->options().origin()) |
5032 | flags |= elfcpp::DF_ORIGIN; | |
e9c1bdad CC |
5033 | if (parameters->options().Bsymbolic() |
5034 | && !parameters->options().have_dynamic_list()) | |
f15f61a7 DK |
5035 | { |
5036 | flags |= elfcpp::DF_SYMBOLIC; | |
5037 | // Add DT_SYMBOLIC for compatibility with older loaders. | |
5038 | odyn->add_constant(elfcpp::DT_SYMBOLIC, 0); | |
5039 | } | |
e1c74d60 ILT |
5040 | if (parameters->options().now()) |
5041 | flags |= elfcpp::DF_BIND_NOW; | |
0d212c3a ILT |
5042 | if (flags != 0) |
5043 | odyn->add_constant(elfcpp::DT_FLAGS, flags); | |
7c414435 DM |
5044 | |
5045 | flags = 0; | |
fb257835 DI |
5046 | if (parameters->options().global()) |
5047 | flags |= elfcpp::DF_1_GLOBAL; | |
7c414435 DM |
5048 | if (parameters->options().initfirst()) |
5049 | flags |= elfcpp::DF_1_INITFIRST; | |
5050 | if (parameters->options().interpose()) | |
5051 | flags |= elfcpp::DF_1_INTERPOSE; | |
5052 | if (parameters->options().loadfltr()) | |
5053 | flags |= elfcpp::DF_1_LOADFLTR; | |
5054 | if (parameters->options().nodefaultlib()) | |
5055 | flags |= elfcpp::DF_1_NODEFLIB; | |
5056 | if (parameters->options().nodelete()) | |
5057 | flags |= elfcpp::DF_1_NODELETE; | |
5058 | if (parameters->options().nodlopen()) | |
5059 | flags |= elfcpp::DF_1_NOOPEN; | |
5060 | if (parameters->options().nodump()) | |
5061 | flags |= elfcpp::DF_1_NODUMP; | |
5062 | if (!parameters->options().shared()) | |
5063 | flags &= ~(elfcpp::DF_1_INITFIRST | |
5064 | | elfcpp::DF_1_NODELETE | |
5065 | | elfcpp::DF_1_NOOPEN); | |
7be8330a CD |
5066 | if (parameters->options().origin()) |
5067 | flags |= elfcpp::DF_1_ORIGIN; | |
e1c74d60 ILT |
5068 | if (parameters->options().now()) |
5069 | flags |= elfcpp::DF_1_NOW; | |
e2153196 ILT |
5070 | if (parameters->options().Bgroup()) |
5071 | flags |= elfcpp::DF_1_GROUP; | |
0d212c3a | 5072 | if (flags != 0) |
7c414435 | 5073 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); |
a3ad94ed ILT |
5074 | } |
5075 | ||
f0ba79e2 ILT |
5076 | // Set the size of the _DYNAMIC symbol table to be the size of the |
5077 | // dynamic data. | |
5078 | ||
5079 | void | |
5080 | Layout::set_dynamic_symbol_size(const Symbol_table* symtab) | |
5081 | { | |
5082 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
6daf5215 ILT |
5083 | if (odyn == NULL) |
5084 | return; | |
f0ba79e2 | 5085 | odyn->finalize_data_size(); |
6daf5215 ILT |
5086 | if (this->dynamic_symbol_ == NULL) |
5087 | return; | |
f0ba79e2 ILT |
5088 | off_t data_size = odyn->data_size(); |
5089 | const int size = parameters->target().get_size(); | |
5090 | if (size == 32) | |
5091 | symtab->get_sized_symbol<32>(this->dynamic_symbol_)->set_symsize(data_size); | |
5092 | else if (size == 64) | |
5093 | symtab->get_sized_symbol<64>(this->dynamic_symbol_)->set_symsize(data_size); | |
5094 | else | |
5095 | gold_unreachable(); | |
5096 | } | |
5097 | ||
dff16297 ILT |
5098 | // The mapping of input section name prefixes to output section names. |
5099 | // In some cases one prefix is itself a prefix of another prefix; in | |
5100 | // such a case the longer prefix must come first. These prefixes are | |
5101 | // based on the GNU linker default ELF linker script. | |
a2fb1b05 | 5102 | |
ead1e424 | 5103 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
1be75daa | 5104 | #define MAPPING_INIT_EXACT(f, t) { f, 0, t, sizeof(t) - 1 } |
dff16297 | 5105 | const Layout::Section_name_mapping Layout::section_name_mapping[] = |
a2fb1b05 | 5106 | { |
dff16297 | 5107 | MAPPING_INIT(".text.", ".text"), |
dff16297 | 5108 | MAPPING_INIT(".rodata.", ".rodata"), |
9b689de0 | 5109 | MAPPING_INIT(".data.rel.ro.local.", ".data.rel.ro.local"), |
1be75daa | 5110 | MAPPING_INIT_EXACT(".data.rel.ro.local", ".data.rel.ro.local"), |
9b689de0 | 5111 | MAPPING_INIT(".data.rel.ro.", ".data.rel.ro"), |
1be75daa | 5112 | MAPPING_INIT_EXACT(".data.rel.ro", ".data.rel.ro"), |
dff16297 ILT |
5113 | MAPPING_INIT(".data.", ".data"), |
5114 | MAPPING_INIT(".bss.", ".bss"), | |
5115 | MAPPING_INIT(".tdata.", ".tdata"), | |
5116 | MAPPING_INIT(".tbss.", ".tbss"), | |
5117 | MAPPING_INIT(".init_array.", ".init_array"), | |
5118 | MAPPING_INIT(".fini_array.", ".fini_array"), | |
5119 | MAPPING_INIT(".sdata.", ".sdata"), | |
5120 | MAPPING_INIT(".sbss.", ".sbss"), | |
5121 | // FIXME: In the GNU linker, .sbss2 and .sdata2 are handled | |
5122 | // differently depending on whether it is creating a shared library. | |
5123 | MAPPING_INIT(".sdata2.", ".sdata"), | |
5124 | MAPPING_INIT(".sbss2.", ".sbss"), | |
5125 | MAPPING_INIT(".lrodata.", ".lrodata"), | |
5126 | MAPPING_INIT(".ldata.", ".ldata"), | |
5127 | MAPPING_INIT(".lbss.", ".lbss"), | |
5128 | MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"), | |
5129 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"), | |
5130 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"), | |
5131 | MAPPING_INIT(".gnu.linkonce.t.", ".text"), | |
5132 | MAPPING_INIT(".gnu.linkonce.r.", ".rodata"), | |
5133 | MAPPING_INIT(".gnu.linkonce.d.", ".data"), | |
5134 | MAPPING_INIT(".gnu.linkonce.b.", ".bss"), | |
5135 | MAPPING_INIT(".gnu.linkonce.s.", ".sdata"), | |
5136 | MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"), | |
5137 | MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"), | |
5138 | MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"), | |
5139 | MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"), | |
5140 | MAPPING_INIT(".gnu.linkonce.td.", ".tdata"), | |
5141 | MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"), | |
5142 | MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"), | |
5143 | MAPPING_INIT(".gnu.linkonce.l.", ".ldata"), | |
5144 | MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"), | |
4a54abbb | 5145 | MAPPING_INIT(".ARM.extab", ".ARM.extab"), |
1dcd334d | 5146 | MAPPING_INIT(".gnu.linkonce.armextab.", ".ARM.extab"), |
4a54abbb | 5147 | MAPPING_INIT(".ARM.exidx", ".ARM.exidx"), |
1dcd334d | 5148 | MAPPING_INIT(".gnu.linkonce.armexidx.", ".ARM.exidx"), |
a2fb1b05 | 5149 | }; |
779bdadb ST |
5150 | |
5151 | // Mapping for ".text" section prefixes with -z,keep-text-section-prefix. | |
5152 | const Layout::Section_name_mapping Layout::text_section_name_mapping[] = | |
5153 | { | |
5154 | MAPPING_INIT(".text.hot.", ".text.hot"), | |
5155 | MAPPING_INIT_EXACT(".text.hot", ".text.hot"), | |
5156 | MAPPING_INIT(".text.unlikely.", ".text.unlikely"), | |
5157 | MAPPING_INIT_EXACT(".text.unlikely", ".text.unlikely"), | |
5158 | MAPPING_INIT(".text.startup.", ".text.startup"), | |
5159 | MAPPING_INIT_EXACT(".text.startup", ".text.startup"), | |
5160 | MAPPING_INIT(".text.exit.", ".text.exit"), | |
5161 | MAPPING_INIT_EXACT(".text.exit", ".text.exit"), | |
5162 | MAPPING_INIT(".text.", ".text"), | |
5163 | }; | |
a2fb1b05 | 5164 | #undef MAPPING_INIT |
1be75daa | 5165 | #undef MAPPING_INIT_EXACT |
a2fb1b05 | 5166 | |
dff16297 ILT |
5167 | const int Layout::section_name_mapping_count = |
5168 | (sizeof(Layout::section_name_mapping) | |
5169 | / sizeof(Layout::section_name_mapping[0])); | |
a2fb1b05 | 5170 | |
779bdadb ST |
5171 | const int Layout::text_section_name_mapping_count = |
5172 | (sizeof(Layout::text_section_name_mapping) | |
5173 | / sizeof(Layout::text_section_name_mapping[0])); | |
5174 | ||
5175 | // Find section name NAME in PSNM and return the mapped name if found | |
5176 | // with the length set in PLEN. | |
5177 | const char * | |
5178 | Layout::match_section_name(const Layout::Section_name_mapping* psnm, | |
5179 | const int count, | |
5180 | const char* name, size_t* plen) | |
5181 | { | |
5182 | for (int i = 0; i < count; ++i, ++psnm) | |
5183 | { | |
5184 | if (psnm->fromlen > 0) | |
5185 | { | |
5186 | if (strncmp(name, psnm->from, psnm->fromlen) == 0) | |
5187 | { | |
5188 | *plen = psnm->tolen; | |
5189 | return psnm->to; | |
5190 | } | |
5191 | } | |
5192 | else | |
5193 | { | |
5194 | if (strcmp(name, psnm->from) == 0) | |
5195 | { | |
5196 | *plen = psnm->tolen; | |
5197 | return psnm->to; | |
5198 | } | |
5199 | } | |
5200 | } | |
5201 | return NULL; | |
5202 | } | |
5203 | ||
ead1e424 ILT |
5204 | // Choose the output section name to use given an input section name. |
5205 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
5206 | // length of NAME. | |
5207 | ||
5208 | const char* | |
5393d741 ILT |
5209 | Layout::output_section_name(const Relobj* relobj, const char* name, |
5210 | size_t* plen) | |
ead1e424 | 5211 | { |
af4a8a83 ILT |
5212 | // gcc 4.3 generates the following sorts of section names when it |
5213 | // needs a section name specific to a function: | |
5214 | // .text.FN | |
5215 | // .rodata.FN | |
5216 | // .sdata2.FN | |
5217 | // .data.FN | |
5218 | // .data.rel.FN | |
5219 | // .data.rel.local.FN | |
5220 | // .data.rel.ro.FN | |
5221 | // .data.rel.ro.local.FN | |
5222 | // .sdata.FN | |
5223 | // .bss.FN | |
5224 | // .sbss.FN | |
5225 | // .tdata.FN | |
5226 | // .tbss.FN | |
5227 | ||
5228 | // The GNU linker maps all of those to the part before the .FN, | |
5229 | // except that .data.rel.local.FN is mapped to .data, and | |
5230 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
5231 | // beginning with .data.rel.ro.local are grouped together. | |
5232 | ||
5233 | // For an anonymous namespace, the string FN can contain a '.'. | |
5234 | ||
5235 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
5236 | // GNU linker maps to .rodata. | |
5237 | ||
dff16297 ILT |
5238 | // The .data.rel.ro sections are used with -z relro. The sections |
5239 | // are recognized by name. We use the same names that the GNU | |
5240 | // linker does for these sections. | |
af4a8a83 | 5241 | |
dff16297 ILT |
5242 | // It is hard to handle this in a principled way, so we don't even |
5243 | // try. We use a table of mappings. If the input section name is | |
5244 | // not found in the table, we simply use it as the output section | |
5245 | // name. | |
af4a8a83 | 5246 | |
779bdadb ST |
5247 | if (parameters->options().keep_text_section_prefix() |
5248 | && is_prefix_of(".text", name)) | |
ead1e424 | 5249 | { |
779bdadb ST |
5250 | const char* match = match_section_name(text_section_name_mapping, |
5251 | text_section_name_mapping_count, | |
5252 | name, plen); | |
5253 | if (match != NULL) | |
5254 | return match; | |
ead1e424 ILT |
5255 | } |
5256 | ||
779bdadb ST |
5257 | const char* match = match_section_name(section_name_mapping, |
5258 | section_name_mapping_count, name, plen); | |
5259 | if (match != NULL) | |
5260 | return match; | |
5261 | ||
5393d741 ILT |
5262 | // As an additional complication, .ctors sections are output in |
5263 | // either .ctors or .init_array sections, and .dtors sections are | |
5264 | // output in either .dtors or .fini_array sections. | |
5265 | if (is_prefix_of(".ctors.", name) || is_prefix_of(".dtors.", name)) | |
5266 | { | |
5267 | if (parameters->options().ctors_in_init_array()) | |
5268 | { | |
5269 | *plen = 11; | |
5270 | return name[1] == 'c' ? ".init_array" : ".fini_array"; | |
5271 | } | |
5272 | else | |
5273 | { | |
5274 | *plen = 6; | |
5275 | return name[1] == 'c' ? ".ctors" : ".dtors"; | |
5276 | } | |
5277 | } | |
5278 | if (parameters->options().ctors_in_init_array() | |
5279 | && (strcmp(name, ".ctors") == 0 || strcmp(name, ".dtors") == 0)) | |
5280 | { | |
5281 | // To make .init_array/.fini_array work with gcc we must exclude | |
5282 | // .ctors and .dtors sections from the crtbegin and crtend | |
5283 | // files. | |
5284 | if (relobj == NULL | |
5285 | || (!Layout::match_file_name(relobj, "crtbegin") | |
5286 | && !Layout::match_file_name(relobj, "crtend"))) | |
5287 | { | |
5288 | *plen = 11; | |
5289 | return name[1] == 'c' ? ".init_array" : ".fini_array"; | |
5290 | } | |
5291 | } | |
5292 | ||
ead1e424 ILT |
5293 | return name; |
5294 | } | |
5295 | ||
5393d741 ILT |
5296 | // Return true if RELOBJ is an input file whose base name matches |
5297 | // FILE_NAME. The base name must have an extension of ".o", and must | |
5298 | // be exactly FILE_NAME.o or FILE_NAME, one character, ".o". This is | |
5299 | // to match crtbegin.o as well as crtbeginS.o without getting confused | |
5300 | // by other possibilities. Overall matching the file name this way is | |
5301 | // a dreadful hack, but the GNU linker does it in order to better | |
5302 | // support gcc, and we need to be compatible. | |
5303 | ||
5304 | bool | |
5305 | Layout::match_file_name(const Relobj* relobj, const char* match) | |
5306 | { | |
5307 | const std::string& file_name(relobj->name()); | |
5308 | const char* base_name = lbasename(file_name.c_str()); | |
5309 | size_t match_len = strlen(match); | |
5310 | if (strncmp(base_name, match, match_len) != 0) | |
5311 | return false; | |
5312 | size_t base_len = strlen(base_name); | |
5313 | if (base_len != match_len + 2 && base_len != match_len + 3) | |
5314 | return false; | |
5315 | return memcmp(base_name + base_len - 2, ".o", 2) == 0; | |
5316 | } | |
5317 | ||
8a4c0b0d ILT |
5318 | // Check if a comdat group or .gnu.linkonce section with the given |
5319 | // NAME is selected for the link. If there is already a section, | |
1ef4d87f ILT |
5320 | // *KEPT_SECTION is set to point to the existing section and the |
5321 | // function returns false. Otherwise, OBJECT, SHNDX, IS_COMDAT, and | |
5322 | // IS_GROUP_NAME are recorded for this NAME in the layout object, | |
5323 | // *KEPT_SECTION is set to the internal copy and the function returns | |
5324 | // true. | |
a2fb1b05 ILT |
5325 | |
5326 | bool | |
e55bde5e | 5327 | Layout::find_or_add_kept_section(const std::string& name, |
1ef4d87f ILT |
5328 | Relobj* object, |
5329 | unsigned int shndx, | |
5330 | bool is_comdat, | |
5331 | bool is_group_name, | |
2e702c99 | 5332 | Kept_section** kept_section) |
a2fb1b05 | 5333 | { |
e55bde5e ILT |
5334 | // It's normal to see a couple of entries here, for the x86 thunk |
5335 | // sections. If we see more than a few, we're linking a C++ | |
5336 | // program, and we resize to get more space to minimize rehashing. | |
5337 | if (this->signatures_.size() > 4 | |
5338 | && !this->resized_signatures_) | |
5339 | { | |
5340 | reserve_unordered_map(&this->signatures_, | |
5341 | this->number_of_input_files_ * 64); | |
5342 | this->resized_signatures_ = true; | |
5343 | } | |
5344 | ||
1ef4d87f ILT |
5345 | Kept_section candidate; |
5346 | std::pair<Signatures::iterator, bool> ins = | |
5347 | this->signatures_.insert(std::make_pair(name, candidate)); | |
a2fb1b05 | 5348 | |
1ef4d87f | 5349 | if (kept_section != NULL) |
8a4c0b0d | 5350 | *kept_section = &ins.first->second; |
a2fb1b05 ILT |
5351 | if (ins.second) |
5352 | { | |
5353 | // This is the first time we've seen this signature. | |
1ef4d87f ILT |
5354 | ins.first->second.set_object(object); |
5355 | ins.first->second.set_shndx(shndx); | |
5356 | if (is_comdat) | |
5357 | ins.first->second.set_is_comdat(); | |
5358 | if (is_group_name) | |
5359 | ins.first->second.set_is_group_name(); | |
a2fb1b05 ILT |
5360 | return true; |
5361 | } | |
5362 | ||
1ef4d87f ILT |
5363 | // We have already seen this signature. |
5364 | ||
5365 | if (ins.first->second.is_group_name()) | |
a2fb1b05 ILT |
5366 | { |
5367 | // We've already seen a real section group with this signature. | |
1ef4d87f ILT |
5368 | // If the kept group is from a plugin object, and we're in the |
5369 | // replacement phase, accept the new one as a replacement. | |
5370 | if (ins.first->second.object() == NULL | |
2e702c99 RM |
5371 | && parameters->options().plugins()->in_replacement_phase()) |
5372 | { | |
1ef4d87f ILT |
5373 | ins.first->second.set_object(object); |
5374 | ins.first->second.set_shndx(shndx); | |
2e702c99 RM |
5375 | return true; |
5376 | } | |
a2fb1b05 ILT |
5377 | return false; |
5378 | } | |
1ef4d87f | 5379 | else if (is_group_name) |
a2fb1b05 ILT |
5380 | { |
5381 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 5382 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 | 5383 | // a section group, and don't include this section group. |
1ef4d87f | 5384 | ins.first->second.set_is_group_name(); |
a2fb1b05 ILT |
5385 | return false; |
5386 | } | |
5387 | else | |
5388 | { | |
5389 | // We've already seen a linkonce section and this is a linkonce | |
5390 | // section. These don't block each other--this may be the same | |
5391 | // symbol name with different section types. | |
5392 | return true; | |
5393 | } | |
5394 | } | |
5395 | ||
a445fddf ILT |
5396 | // Store the allocated sections into the section list. |
5397 | ||
5398 | void | |
2ea97941 | 5399 | Layout::get_allocated_sections(Section_list* section_list) const |
a445fddf ILT |
5400 | { |
5401 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5402 | p != this->section_list_.end(); | |
5403 | ++p) | |
5404 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) | |
2ea97941 | 5405 | section_list->push_back(*p); |
a445fddf ILT |
5406 | } |
5407 | ||
ec661b9d AM |
5408 | // Store the executable sections into the section list. |
5409 | ||
5410 | void | |
5411 | Layout::get_executable_sections(Section_list* section_list) const | |
5412 | { | |
5413 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5414 | p != this->section_list_.end(); | |
5415 | ++p) | |
5416 | if (((*p)->flags() & (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) | |
5417 | == (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) | |
5418 | section_list->push_back(*p); | |
5419 | } | |
5420 | ||
a445fddf ILT |
5421 | // Create an output segment. |
5422 | ||
5423 | Output_segment* | |
5424 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
5425 | { | |
8851ecca | 5426 | gold_assert(!parameters->options().relocatable()); |
a445fddf ILT |
5427 | Output_segment* oseg = new Output_segment(type, flags); |
5428 | this->segment_list_.push_back(oseg); | |
2d924fd9 ILT |
5429 | |
5430 | if (type == elfcpp::PT_TLS) | |
5431 | this->tls_segment_ = oseg; | |
5432 | else if (type == elfcpp::PT_GNU_RELRO) | |
5433 | this->relro_segment_ = oseg; | |
10b4f102 ILT |
5434 | else if (type == elfcpp::PT_INTERP) |
5435 | this->interp_segment_ = oseg; | |
2d924fd9 | 5436 | |
a445fddf ILT |
5437 | return oseg; |
5438 | } | |
5439 | ||
bec5b579 CC |
5440 | // Return the file offset of the normal symbol table. |
5441 | ||
5442 | off_t | |
5443 | Layout::symtab_section_offset() const | |
5444 | { | |
5445 | if (this->symtab_section_ != NULL) | |
5446 | return this->symtab_section_->offset(); | |
5447 | return 0; | |
5448 | } | |
5449 | ||
886f533a ILT |
5450 | // Return the section index of the normal symbol table. It may have |
5451 | // been stripped by the -s/--strip-all option. | |
5452 | ||
5453 | unsigned int | |
5454 | Layout::symtab_section_shndx() const | |
5455 | { | |
5456 | if (this->symtab_section_ != NULL) | |
5457 | return this->symtab_section_->out_shndx(); | |
5458 | return 0; | |
5459 | } | |
5460 | ||
730cdc88 ILT |
5461 | // Write out the Output_sections. Most won't have anything to write, |
5462 | // since most of the data will come from input sections which are | |
5463 | // handled elsewhere. But some Output_sections do have Output_data. | |
5464 | ||
5465 | void | |
5466 | Layout::write_output_sections(Output_file* of) const | |
5467 | { | |
5468 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5469 | p != this->section_list_.end(); | |
5470 | ++p) | |
5471 | { | |
5472 | if (!(*p)->after_input_sections()) | |
5473 | (*p)->write(of); | |
5474 | } | |
5475 | } | |
5476 | ||
61ba1cf9 ILT |
5477 | // Write out data not associated with a section or the symbol table. |
5478 | ||
5479 | void | |
9025d29d | 5480 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 5481 | { |
8851ecca | 5482 | if (!parameters->options().strip_all()) |
a3ad94ed | 5483 | { |
2ea97941 | 5484 | const Output_section* symtab_section = this->symtab_section_; |
9e2dcb77 ILT |
5485 | for (Section_list::const_iterator p = this->section_list_.begin(); |
5486 | p != this->section_list_.end(); | |
5487 | ++p) | |
a3ad94ed | 5488 | { |
9e2dcb77 ILT |
5489 | if ((*p)->needs_symtab_index()) |
5490 | { | |
2ea97941 | 5491 | gold_assert(symtab_section != NULL); |
9e2dcb77 ILT |
5492 | unsigned int index = (*p)->symtab_index(); |
5493 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
5494 | off_t off = (symtab_section->offset() |
5495 | + index * symtab_section->entsize()); | |
d491d34e | 5496 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
9e2dcb77 | 5497 | } |
a3ad94ed ILT |
5498 | } |
5499 | } | |
5500 | ||
2ea97941 | 5501 | const Output_section* dynsym_section = this->dynsym_section_; |
a3ad94ed ILT |
5502 | for (Section_list::const_iterator p = this->section_list_.begin(); |
5503 | p != this->section_list_.end(); | |
5504 | ++p) | |
5505 | { | |
5506 | if ((*p)->needs_dynsym_index()) | |
5507 | { | |
2ea97941 | 5508 | gold_assert(dynsym_section != NULL); |
a3ad94ed ILT |
5509 | unsigned int index = (*p)->dynsym_index(); |
5510 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
5511 | off_t off = (dynsym_section->offset() |
5512 | + index * dynsym_section->entsize()); | |
d491d34e | 5513 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
a3ad94ed ILT |
5514 | } |
5515 | } | |
5516 | ||
a3ad94ed | 5517 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
5518 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
5519 | p != this->special_output_list_.end(); | |
5520 | ++p) | |
5521 | (*p)->write(of); | |
eb426534 RM |
5522 | |
5523 | // Write out the Output_data which are not in an Output_section | |
5524 | // and are regenerated in each iteration of relaxation. | |
5525 | for (Data_list::const_iterator p = this->relax_output_list_.begin(); | |
5526 | p != this->relax_output_list_.end(); | |
5527 | ++p) | |
5528 | (*p)->write(of); | |
61ba1cf9 ILT |
5529 | } |
5530 | ||
730cdc88 ILT |
5531 | // Write out the Output_sections which can only be written after the |
5532 | // input sections are complete. | |
5533 | ||
5534 | void | |
27bc2bce | 5535 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 5536 | { |
27bc2bce | 5537 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
5538 | // file size. Note we finalize the .shstrab last, to allow the |
5539 | // after_input_section sections to modify their section-names before | |
5540 | // writing. | |
17a1d0a9 | 5541 | if (this->any_postprocessing_sections_) |
27bc2bce | 5542 | { |
17a1d0a9 ILT |
5543 | off_t off = this->output_file_size_; |
5544 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); | |
8a4c0b0d | 5545 | |
17a1d0a9 ILT |
5546 | // Now that we've finalized the names, we can finalize the shstrab. |
5547 | off = | |
5548 | this->set_section_offsets(off, | |
5549 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
5550 | ||
5551 | if (off > this->output_file_size_) | |
5552 | { | |
5553 | of->resize(off); | |
5554 | this->output_file_size_ = off; | |
5555 | } | |
27bc2bce ILT |
5556 | } |
5557 | ||
730cdc88 ILT |
5558 | for (Section_list::const_iterator p = this->section_list_.begin(); |
5559 | p != this->section_list_.end(); | |
5560 | ++p) | |
5561 | { | |
5562 | if ((*p)->after_input_sections()) | |
5563 | (*p)->write(of); | |
5564 | } | |
27bc2bce | 5565 | |
27bc2bce | 5566 | this->section_headers_->write(of); |
730cdc88 ILT |
5567 | } |
5568 | ||
e7c5ea40 CC |
5569 | // If a tree-style build ID was requested, the parallel part of that computation |
5570 | // is already done, and the final hash-of-hashes is computed here. For other | |
5571 | // types of build IDs, all the work is done here. | |
8ed814a9 ILT |
5572 | |
5573 | void | |
9c7fe3c5 CC |
5574 | Layout::write_build_id(Output_file* of, unsigned char* array_of_hashes, |
5575 | size_t size_of_hashes) const | |
8ed814a9 ILT |
5576 | { |
5577 | if (this->build_id_note_ == NULL) | |
5578 | return; | |
5579 | ||
8ed814a9 | 5580 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), |
bbc5ae17 | 5581 | this->build_id_note_->data_size()); |
8ed814a9 | 5582 | |
9c7fe3c5 | 5583 | if (array_of_hashes == NULL) |
8ed814a9 | 5584 | { |
e7c5ea40 CC |
5585 | const size_t output_file_size = this->output_file_size(); |
5586 | const unsigned char* iv = of->get_input_view(0, output_file_size); | |
5587 | const char* style = parameters->options().build_id(); | |
5588 | ||
5589 | // If we get here with style == "tree" then the output must be | |
5590 | // too small for chunking, and we use SHA-1 in that case. | |
5591 | if ((strcmp(style, "sha1") == 0) || (strcmp(style, "tree") == 0)) | |
bbc5ae17 | 5592 | sha1_buffer(reinterpret_cast<const char*>(iv), output_file_size, ov); |
e7c5ea40 | 5593 | else if (strcmp(style, "md5") == 0) |
bbc5ae17 | 5594 | md5_buffer(reinterpret_cast<const char*>(iv), output_file_size, ov); |
e7c5ea40 | 5595 | else |
bbc5ae17 | 5596 | gold_unreachable(); |
e7c5ea40 CC |
5597 | |
5598 | of->free_input_view(0, output_file_size, iv); | |
8ed814a9 | 5599 | } |
e7c5ea40 | 5600 | else |
8ed814a9 | 5601 | { |
e7c5ea40 CC |
5602 | // Non-overlapping substrings of the output file have been hashed. |
5603 | // Compute SHA-1 hash of the hashes. | |
9c7fe3c5 CC |
5604 | sha1_buffer(reinterpret_cast<const char*>(array_of_hashes), |
5605 | size_of_hashes, ov); | |
5606 | delete[] array_of_hashes; | |
8ed814a9 | 5607 | } |
8ed814a9 ILT |
5608 | |
5609 | of->write_output_view(this->build_id_note_->offset(), | |
5610 | this->build_id_note_->data_size(), | |
5611 | ov); | |
8ed814a9 ILT |
5612 | } |
5613 | ||
516cb3d0 ILT |
5614 | // Write out a binary file. This is called after the link is |
5615 | // complete. IN is the temporary output file we used to generate the | |
5616 | // ELF code. We simply walk through the segments, read them from | |
5617 | // their file offset in IN, and write them to their load address in | |
5618 | // the output file. FIXME: with a bit more work, we could support | |
5619 | // S-records and/or Intel hex format here. | |
5620 | ||
5621 | void | |
5622 | Layout::write_binary(Output_file* in) const | |
5623 | { | |
e55bde5e | 5624 | gold_assert(parameters->options().oformat_enum() |
bc644c6c | 5625 | == General_options::OBJECT_FORMAT_BINARY); |
516cb3d0 ILT |
5626 | |
5627 | // Get the size of the binary file. | |
5628 | uint64_t max_load_address = 0; | |
5629 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
5630 | p != this->segment_list_.end(); | |
5631 | ++p) | |
5632 | { | |
5633 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
5634 | { | |
5635 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); | |
5636 | if (max_paddr > max_load_address) | |
5637 | max_load_address = max_paddr; | |
5638 | } | |
5639 | } | |
5640 | ||
8851ecca | 5641 | Output_file out(parameters->options().output_file_name()); |
516cb3d0 ILT |
5642 | out.open(max_load_address); |
5643 | ||
5644 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
5645 | p != this->segment_list_.end(); | |
5646 | ++p) | |
5647 | { | |
5648 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
5649 | { | |
5650 | const unsigned char* vin = in->get_input_view((*p)->offset(), | |
5651 | (*p)->filesz()); | |
5652 | unsigned char* vout = out.get_output_view((*p)->paddr(), | |
5653 | (*p)->filesz()); | |
5654 | memcpy(vout, vin, (*p)->filesz()); | |
5655 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); | |
5656 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); | |
5657 | } | |
5658 | } | |
5659 | ||
5660 | out.close(); | |
5661 | } | |
5662 | ||
7d9e3d98 ILT |
5663 | // Print the output sections to the map file. |
5664 | ||
5665 | void | |
5666 | Layout::print_to_mapfile(Mapfile* mapfile) const | |
5667 | { | |
5668 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
5669 | p != this->segment_list_.end(); | |
5670 | ++p) | |
5671 | (*p)->print_sections_to_mapfile(mapfile); | |
8f89af0a CC |
5672 | for (Section_list::const_iterator p = this->unattached_section_list_.begin(); |
5673 | p != this->unattached_section_list_.end(); | |
5674 | ++p) | |
5675 | (*p)->print_to_mapfile(mapfile); | |
7d9e3d98 ILT |
5676 | } |
5677 | ||
ad8f37d1 ILT |
5678 | // Print statistical information to stderr. This is used for --stats. |
5679 | ||
5680 | void | |
5681 | Layout::print_stats() const | |
5682 | { | |
5683 | this->namepool_.print_stats("section name pool"); | |
5684 | this->sympool_.print_stats("output symbol name pool"); | |
5685 | this->dynpool_.print_stats("dynamic name pool"); | |
38c5e8b4 ILT |
5686 | |
5687 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5688 | p != this->section_list_.end(); | |
5689 | ++p) | |
5690 | (*p)->print_merge_stats(); | |
ad8f37d1 ILT |
5691 | } |
5692 | ||
730cdc88 ILT |
5693 | // Write_sections_task methods. |
5694 | ||
5695 | // We can always run this task. | |
5696 | ||
17a1d0a9 ILT |
5697 | Task_token* |
5698 | Write_sections_task::is_runnable() | |
730cdc88 | 5699 | { |
17a1d0a9 | 5700 | return NULL; |
730cdc88 ILT |
5701 | } |
5702 | ||
5703 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
5704 | // when finished. | |
5705 | ||
17a1d0a9 ILT |
5706 | void |
5707 | Write_sections_task::locks(Task_locker* tl) | |
730cdc88 | 5708 | { |
17a1d0a9 | 5709 | tl->add(this, this->output_sections_blocker_); |
635aa30e CC |
5710 | if (this->input_sections_blocker_ != NULL) |
5711 | tl->add(this, this->input_sections_blocker_); | |
17a1d0a9 | 5712 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
5713 | } |
5714 | ||
5715 | // Run the task--write out the data. | |
5716 | ||
5717 | void | |
5718 | Write_sections_task::run(Workqueue*) | |
5719 | { | |
5720 | this->layout_->write_output_sections(this->of_); | |
5721 | } | |
5722 | ||
61ba1cf9 ILT |
5723 | // Write_data_task methods. |
5724 | ||
5725 | // We can always run this task. | |
5726 | ||
17a1d0a9 ILT |
5727 | Task_token* |
5728 | Write_data_task::is_runnable() | |
61ba1cf9 | 5729 | { |
17a1d0a9 | 5730 | return NULL; |
61ba1cf9 ILT |
5731 | } |
5732 | ||
5733 | // We need to unlock FINAL_BLOCKER when finished. | |
5734 | ||
17a1d0a9 ILT |
5735 | void |
5736 | Write_data_task::locks(Task_locker* tl) | |
61ba1cf9 | 5737 | { |
17a1d0a9 | 5738 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
5739 | } |
5740 | ||
5741 | // Run the task--write out the data. | |
5742 | ||
5743 | void | |
5744 | Write_data_task::run(Workqueue*) | |
5745 | { | |
9025d29d | 5746 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
5747 | } |
5748 | ||
5749 | // Write_symbols_task methods. | |
5750 | ||
5751 | // We can always run this task. | |
5752 | ||
17a1d0a9 ILT |
5753 | Task_token* |
5754 | Write_symbols_task::is_runnable() | |
61ba1cf9 | 5755 | { |
17a1d0a9 | 5756 | return NULL; |
61ba1cf9 ILT |
5757 | } |
5758 | ||
5759 | // We need to unlock FINAL_BLOCKER when finished. | |
5760 | ||
17a1d0a9 ILT |
5761 | void |
5762 | Write_symbols_task::locks(Task_locker* tl) | |
61ba1cf9 | 5763 | { |
17a1d0a9 | 5764 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
5765 | } |
5766 | ||
5767 | // Run the task--write out the symbols. | |
5768 | ||
5769 | void | |
5770 | Write_symbols_task::run(Workqueue*) | |
5771 | { | |
fd9d194f ILT |
5772 | this->symtab_->write_globals(this->sympool_, this->dynpool_, |
5773 | this->layout_->symtab_xindex(), | |
d491d34e | 5774 | this->layout_->dynsym_xindex(), this->of_); |
61ba1cf9 ILT |
5775 | } |
5776 | ||
730cdc88 ILT |
5777 | // Write_after_input_sections_task methods. |
5778 | ||
5779 | // We can only run this task after the input sections have completed. | |
5780 | ||
17a1d0a9 ILT |
5781 | Task_token* |
5782 | Write_after_input_sections_task::is_runnable() | |
730cdc88 ILT |
5783 | { |
5784 | if (this->input_sections_blocker_->is_blocked()) | |
17a1d0a9 ILT |
5785 | return this->input_sections_blocker_; |
5786 | return NULL; | |
730cdc88 ILT |
5787 | } |
5788 | ||
5789 | // We need to unlock FINAL_BLOCKER when finished. | |
5790 | ||
17a1d0a9 ILT |
5791 | void |
5792 | Write_after_input_sections_task::locks(Task_locker* tl) | |
730cdc88 | 5793 | { |
17a1d0a9 | 5794 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
5795 | } |
5796 | ||
5797 | // Run the task. | |
5798 | ||
5799 | void | |
5800 | Write_after_input_sections_task::run(Workqueue*) | |
5801 | { | |
5802 | this->layout_->write_sections_after_input_sections(this->of_); | |
5803 | } | |
5804 | ||
9c7fe3c5 CC |
5805 | // Build IDs can be computed as a "flat" sha1 or md5 of a string of bytes, |
5806 | // or as a "tree" where each chunk of the string is hashed and then those | |
5807 | // hashes are put into a (much smaller) string which is hashed with sha1. | |
5808 | // We compute a checksum over the entire file because that is simplest. | |
5809 | ||
5810 | void | |
5811 | Build_id_task_runner::run(Workqueue* workqueue, const Task*) | |
5812 | { | |
5813 | Task_token* post_hash_tasks_blocker = new Task_token(true); | |
5814 | const Layout* layout = this->layout_; | |
5815 | Output_file* of = this->of_; | |
5816 | const size_t filesize = (layout->output_file_size() <= 0 ? 0 | |
5817 | : static_cast<size_t>(layout->output_file_size())); | |
5818 | unsigned char* array_of_hashes = NULL; | |
5819 | size_t size_of_hashes = 0; | |
5820 | ||
5821 | if (strcmp(this->options_->build_id(), "tree") == 0 | |
5822 | && this->options_->build_id_chunk_size_for_treehash() > 0 | |
5823 | && filesize > 0 | |
5824 | && (filesize >= this->options_->build_id_min_file_size_for_treehash())) | |
5825 | { | |
5826 | static const size_t MD5_OUTPUT_SIZE_IN_BYTES = 16; | |
5827 | const size_t chunk_size = | |
5828 | this->options_->build_id_chunk_size_for_treehash(); | |
5829 | const size_t num_hashes = ((filesize - 1) / chunk_size) + 1; | |
5830 | post_hash_tasks_blocker->add_blockers(num_hashes); | |
5831 | size_of_hashes = num_hashes * MD5_OUTPUT_SIZE_IN_BYTES; | |
5832 | array_of_hashes = new unsigned char[size_of_hashes]; | |
5833 | unsigned char *dst = array_of_hashes; | |
5834 | for (size_t i = 0, src_offset = 0; i < num_hashes; | |
5835 | i++, dst += MD5_OUTPUT_SIZE_IN_BYTES, src_offset += chunk_size) | |
5836 | { | |
5837 | size_t size = std::min(chunk_size, filesize - src_offset); | |
5838 | workqueue->queue(new Hash_task(of, | |
5839 | src_offset, | |
5840 | size, | |
5841 | dst, | |
5842 | post_hash_tasks_blocker)); | |
5843 | } | |
5844 | } | |
5845 | ||
5846 | // Queue the final task to write the build id and close the output file. | |
5847 | workqueue->queue(new Task_function(new Close_task_runner(this->options_, | |
5848 | layout, | |
5849 | of, | |
5850 | array_of_hashes, | |
5851 | size_of_hashes), | |
5852 | post_hash_tasks_blocker, | |
5853 | "Task_function Close_task_runner")); | |
5854 | } | |
5855 | ||
92e059d8 | 5856 | // Close_task_runner methods. |
61ba1cf9 | 5857 | |
e7c5ea40 CC |
5858 | // Finish up the build ID computation, if necessary, and write a binary file, |
5859 | // if necessary. Then close the output file. | |
61ba1cf9 ILT |
5860 | |
5861 | void | |
17a1d0a9 | 5862 | Close_task_runner::run(Workqueue*, const Task*) |
61ba1cf9 | 5863 | { |
e7c5ea40 | 5864 | // At this point the multi-threaded part of the build ID computation, |
9c7fe3c5 CC |
5865 | // if any, is done. See Build_id_task_runner. |
5866 | this->layout_->write_build_id(this->of_, this->array_of_hashes_, | |
5867 | this->size_of_hashes_); | |
8ed814a9 | 5868 | |
516cb3d0 | 5869 | // If we've been asked to create a binary file, we do so here. |
7cc619c3 | 5870 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
5871 | this->layout_->write_binary(this->of_); |
5872 | ||
61ba1cf9 ILT |
5873 | this->of_->close(); |
5874 | } | |
5875 | ||
a2fb1b05 ILT |
5876 | // Instantiate the templates we need. We could use the configure |
5877 | // script to restrict this to only the ones for implemented targets. | |
5878 | ||
193a53d9 | 5879 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 | 5880 | template |
cdc29364 CC |
5881 | Output_section* |
5882 | Layout::init_fixed_output_section<32, false>( | |
5883 | const char* name, | |
5884 | elfcpp::Shdr<32, false>& shdr); | |
5885 | #endif | |
5886 | ||
5887 | #ifdef HAVE_TARGET_32_BIG | |
5888 | template | |
5889 | Output_section* | |
5890 | Layout::init_fixed_output_section<32, true>( | |
5891 | const char* name, | |
5892 | elfcpp::Shdr<32, true>& shdr); | |
5893 | #endif | |
5894 | ||
5895 | #ifdef HAVE_TARGET_64_LITTLE | |
5896 | template | |
5897 | Output_section* | |
5898 | Layout::init_fixed_output_section<64, false>( | |
5899 | const char* name, | |
5900 | elfcpp::Shdr<64, false>& shdr); | |
5901 | #endif | |
5902 | ||
5903 | #ifdef HAVE_TARGET_64_BIG | |
5904 | template | |
5905 | Output_section* | |
5906 | Layout::init_fixed_output_section<64, true>( | |
5907 | const char* name, | |
5908 | elfcpp::Shdr<64, true>& shdr); | |
5909 | #endif | |
5910 | ||
5911 | #ifdef HAVE_TARGET_32_LITTLE | |
5912 | template | |
a2fb1b05 | 5913 | Output_section* |
6fa2a40b CC |
5914 | Layout::layout<32, false>(Sized_relobj_file<32, false>* object, |
5915 | unsigned int shndx, | |
730cdc88 ILT |
5916 | const char* name, |
5917 | const elfcpp::Shdr<32, false>& shdr, | |
5918 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5919 | #endif |
a2fb1b05 | 5920 | |
193a53d9 | 5921 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
5922 | template |
5923 | Output_section* | |
6fa2a40b CC |
5924 | Layout::layout<32, true>(Sized_relobj_file<32, true>* object, |
5925 | unsigned int shndx, | |
730cdc88 ILT |
5926 | const char* name, |
5927 | const elfcpp::Shdr<32, true>& shdr, | |
5928 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5929 | #endif |
a2fb1b05 | 5930 | |
193a53d9 | 5931 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
5932 | template |
5933 | Output_section* | |
6fa2a40b CC |
5934 | Layout::layout<64, false>(Sized_relobj_file<64, false>* object, |
5935 | unsigned int shndx, | |
730cdc88 ILT |
5936 | const char* name, |
5937 | const elfcpp::Shdr<64, false>& shdr, | |
5938 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5939 | #endif |
a2fb1b05 | 5940 | |
193a53d9 | 5941 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
5942 | template |
5943 | Output_section* | |
6fa2a40b CC |
5944 | Layout::layout<64, true>(Sized_relobj_file<64, true>* object, |
5945 | unsigned int shndx, | |
730cdc88 ILT |
5946 | const char* name, |
5947 | const elfcpp::Shdr<64, true>& shdr, | |
5948 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5949 | #endif |
a2fb1b05 | 5950 | |
6a74a719 ILT |
5951 | #ifdef HAVE_TARGET_32_LITTLE |
5952 | template | |
5953 | Output_section* | |
6fa2a40b | 5954 | Layout::layout_reloc<32, false>(Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
5955 | unsigned int reloc_shndx, |
5956 | const elfcpp::Shdr<32, false>& shdr, | |
5957 | Output_section* data_section, | |
5958 | Relocatable_relocs* rr); | |
5959 | #endif | |
5960 | ||
5961 | #ifdef HAVE_TARGET_32_BIG | |
5962 | template | |
5963 | Output_section* | |
6fa2a40b | 5964 | Layout::layout_reloc<32, true>(Sized_relobj_file<32, true>* object, |
6a74a719 ILT |
5965 | unsigned int reloc_shndx, |
5966 | const elfcpp::Shdr<32, true>& shdr, | |
5967 | Output_section* data_section, | |
5968 | Relocatable_relocs* rr); | |
5969 | #endif | |
5970 | ||
5971 | #ifdef HAVE_TARGET_64_LITTLE | |
5972 | template | |
5973 | Output_section* | |
6fa2a40b | 5974 | Layout::layout_reloc<64, false>(Sized_relobj_file<64, false>* object, |
6a74a719 ILT |
5975 | unsigned int reloc_shndx, |
5976 | const elfcpp::Shdr<64, false>& shdr, | |
5977 | Output_section* data_section, | |
5978 | Relocatable_relocs* rr); | |
5979 | #endif | |
5980 | ||
5981 | #ifdef HAVE_TARGET_64_BIG | |
5982 | template | |
5983 | Output_section* | |
6fa2a40b | 5984 | Layout::layout_reloc<64, true>(Sized_relobj_file<64, true>* object, |
6a74a719 ILT |
5985 | unsigned int reloc_shndx, |
5986 | const elfcpp::Shdr<64, true>& shdr, | |
5987 | Output_section* data_section, | |
5988 | Relocatable_relocs* rr); | |
5989 | #endif | |
5990 | ||
5991 | #ifdef HAVE_TARGET_32_LITTLE | |
5992 | template | |
5993 | void | |
5994 | Layout::layout_group<32, false>(Symbol_table* symtab, | |
6fa2a40b | 5995 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
5996 | unsigned int, |
5997 | const char* group_section_name, | |
5998 | const char* signature, | |
5999 | const elfcpp::Shdr<32, false>& shdr, | |
8825ac63 ILT |
6000 | elfcpp::Elf_Word flags, |
6001 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
6002 | #endif |
6003 | ||
6004 | #ifdef HAVE_TARGET_32_BIG | |
6005 | template | |
6006 | void | |
6007 | Layout::layout_group<32, true>(Symbol_table* symtab, | |
6fa2a40b | 6008 | Sized_relobj_file<32, true>* object, |
6a74a719 ILT |
6009 | unsigned int, |
6010 | const char* group_section_name, | |
6011 | const char* signature, | |
6012 | const elfcpp::Shdr<32, true>& shdr, | |
8825ac63 ILT |
6013 | elfcpp::Elf_Word flags, |
6014 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
6015 | #endif |
6016 | ||
6017 | #ifdef HAVE_TARGET_64_LITTLE | |
6018 | template | |
6019 | void | |
6020 | Layout::layout_group<64, false>(Symbol_table* symtab, | |
6fa2a40b | 6021 | Sized_relobj_file<64, false>* object, |
6a74a719 ILT |
6022 | unsigned int, |
6023 | const char* group_section_name, | |
6024 | const char* signature, | |
6025 | const elfcpp::Shdr<64, false>& shdr, | |
8825ac63 ILT |
6026 | elfcpp::Elf_Word flags, |
6027 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
6028 | #endif |
6029 | ||
6030 | #ifdef HAVE_TARGET_64_BIG | |
6031 | template | |
6032 | void | |
6033 | Layout::layout_group<64, true>(Symbol_table* symtab, | |
6fa2a40b | 6034 | Sized_relobj_file<64, true>* object, |
6a74a719 ILT |
6035 | unsigned int, |
6036 | const char* group_section_name, | |
6037 | const char* signature, | |
6038 | const elfcpp::Shdr<64, true>& shdr, | |
8825ac63 ILT |
6039 | elfcpp::Elf_Word flags, |
6040 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
6041 | #endif |
6042 | ||
730cdc88 ILT |
6043 | #ifdef HAVE_TARGET_32_LITTLE |
6044 | template | |
6045 | Output_section* | |
6fa2a40b | 6046 | Layout::layout_eh_frame<32, false>(Sized_relobj_file<32, false>* object, |
730cdc88 ILT |
6047 | const unsigned char* symbols, |
6048 | off_t symbols_size, | |
6049 | const unsigned char* symbol_names, | |
6050 | off_t symbol_names_size, | |
6051 | unsigned int shndx, | |
6052 | const elfcpp::Shdr<32, false>& shdr, | |
6053 | unsigned int reloc_shndx, | |
6054 | unsigned int reloc_type, | |
6055 | off_t* off); | |
6056 | #endif | |
6057 | ||
6058 | #ifdef HAVE_TARGET_32_BIG | |
6059 | template | |
6060 | Output_section* | |
6fa2a40b CC |
6061 | Layout::layout_eh_frame<32, true>(Sized_relobj_file<32, true>* object, |
6062 | const unsigned char* symbols, | |
6063 | off_t symbols_size, | |
730cdc88 ILT |
6064 | const unsigned char* symbol_names, |
6065 | off_t symbol_names_size, | |
6066 | unsigned int shndx, | |
6067 | const elfcpp::Shdr<32, true>& shdr, | |
6068 | unsigned int reloc_shndx, | |
6069 | unsigned int reloc_type, | |
6070 | off_t* off); | |
6071 | #endif | |
6072 | ||
6073 | #ifdef HAVE_TARGET_64_LITTLE | |
6074 | template | |
6075 | Output_section* | |
6fa2a40b | 6076 | Layout::layout_eh_frame<64, false>(Sized_relobj_file<64, false>* object, |
730cdc88 ILT |
6077 | const unsigned char* symbols, |
6078 | off_t symbols_size, | |
6079 | const unsigned char* symbol_names, | |
6080 | off_t symbol_names_size, | |
6081 | unsigned int shndx, | |
6082 | const elfcpp::Shdr<64, false>& shdr, | |
6083 | unsigned int reloc_shndx, | |
6084 | unsigned int reloc_type, | |
6085 | off_t* off); | |
6086 | #endif | |
6087 | ||
6088 | #ifdef HAVE_TARGET_64_BIG | |
6089 | template | |
6090 | Output_section* | |
6fa2a40b CC |
6091 | Layout::layout_eh_frame<64, true>(Sized_relobj_file<64, true>* object, |
6092 | const unsigned char* symbols, | |
6093 | off_t symbols_size, | |
730cdc88 ILT |
6094 | const unsigned char* symbol_names, |
6095 | off_t symbol_names_size, | |
6096 | unsigned int shndx, | |
6097 | const elfcpp::Shdr<64, true>& shdr, | |
6098 | unsigned int reloc_shndx, | |
6099 | unsigned int reloc_type, | |
6100 | off_t* off); | |
6101 | #endif | |
a2fb1b05 | 6102 | |
c1027032 CC |
6103 | #ifdef HAVE_TARGET_32_LITTLE |
6104 | template | |
6105 | void | |
6106 | Layout::add_to_gdb_index(bool is_type_unit, | |
6107 | Sized_relobj<32, false>* object, | |
6108 | const unsigned char* symbols, | |
6109 | off_t symbols_size, | |
6110 | unsigned int shndx, | |
6111 | unsigned int reloc_shndx, | |
6112 | unsigned int reloc_type); | |
6113 | #endif | |
6114 | ||
6115 | #ifdef HAVE_TARGET_32_BIG | |
6116 | template | |
6117 | void | |
6118 | Layout::add_to_gdb_index(bool is_type_unit, | |
6119 | Sized_relobj<32, true>* object, | |
6120 | const unsigned char* symbols, | |
6121 | off_t symbols_size, | |
6122 | unsigned int shndx, | |
6123 | unsigned int reloc_shndx, | |
6124 | unsigned int reloc_type); | |
6125 | #endif | |
6126 | ||
6127 | #ifdef HAVE_TARGET_64_LITTLE | |
6128 | template | |
6129 | void | |
6130 | Layout::add_to_gdb_index(bool is_type_unit, | |
6131 | Sized_relobj<64, false>* object, | |
6132 | const unsigned char* symbols, | |
6133 | off_t symbols_size, | |
6134 | unsigned int shndx, | |
6135 | unsigned int reloc_shndx, | |
6136 | unsigned int reloc_type); | |
6137 | #endif | |
6138 | ||
6139 | #ifdef HAVE_TARGET_64_BIG | |
6140 | template | |
6141 | void | |
6142 | Layout::add_to_gdb_index(bool is_type_unit, | |
6143 | Sized_relobj<64, true>* object, | |
6144 | const unsigned char* symbols, | |
6145 | off_t symbols_size, | |
6146 | unsigned int shndx, | |
6147 | unsigned int reloc_shndx, | |
6148 | unsigned int reloc_type); | |
6149 | #endif | |
6150 | ||
a2fb1b05 | 6151 | } // End namespace gold. |