Commit | Line | Data |
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a2fb1b05 ILT |
1 | // layout.cc -- lay out output file sections for gold |
2 | ||
2e702c99 RM |
3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
4 | // Free Software Foundation, Inc. | |
6cb15b7f ILT |
5 | // Written by Ian Lance Taylor <iant@google.com>. |
6 | ||
7 | // This file is part of gold. | |
8 | ||
9 | // This program is free software; you can redistribute it and/or modify | |
10 | // it under the terms of the GNU General Public License as published by | |
11 | // the Free Software Foundation; either version 3 of the License, or | |
12 | // (at your option) any later version. | |
13 | ||
14 | // This program is distributed in the hope that it will be useful, | |
15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | // GNU General Public License for more details. | |
18 | ||
19 | // You should have received a copy of the GNU General Public License | |
20 | // along with this program; if not, write to the Free Software | |
21 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | // MA 02110-1301, USA. | |
23 | ||
a2fb1b05 ILT |
24 | #include "gold.h" |
25 | ||
8ed814a9 | 26 | #include <cerrno> |
a2fb1b05 | 27 | #include <cstring> |
54dc6425 | 28 | #include <algorithm> |
a2fb1b05 | 29 | #include <iostream> |
6e9ba2ca | 30 | #include <fstream> |
a2fb1b05 | 31 | #include <utility> |
8ed814a9 | 32 | #include <fcntl.h> |
6e9ba2ca | 33 | #include <fnmatch.h> |
8ed814a9 ILT |
34 | #include <unistd.h> |
35 | #include "libiberty.h" | |
36 | #include "md5.h" | |
37 | #include "sha1.h" | |
a2fb1b05 | 38 | |
7e1edb90 | 39 | #include "parameters.h" |
14144f39 | 40 | #include "options.h" |
7d9e3d98 | 41 | #include "mapfile.h" |
a445fddf ILT |
42 | #include "script.h" |
43 | #include "script-sections.h" | |
a2fb1b05 | 44 | #include "output.h" |
f6ce93d6 | 45 | #include "symtab.h" |
a3ad94ed | 46 | #include "dynobj.h" |
3151305a | 47 | #include "ehframe.h" |
c1027032 | 48 | #include "gdb-index.h" |
96803768 | 49 | #include "compressed_output.h" |
62b01cb5 | 50 | #include "reduced_debug_output.h" |
487b39df | 51 | #include "object.h" |
6a74a719 | 52 | #include "reloc.h" |
2a00e4fb | 53 | #include "descriptors.h" |
2756a258 | 54 | #include "plugin.h" |
3ce2c28e ILT |
55 | #include "incremental.h" |
56 | #include "layout.h" | |
a2fb1b05 ILT |
57 | |
58 | namespace gold | |
59 | { | |
60 | ||
cdc29364 CC |
61 | // Class Free_list. |
62 | ||
63 | // The total number of free lists used. | |
64 | unsigned int Free_list::num_lists = 0; | |
65 | // The total number of free list nodes used. | |
66 | unsigned int Free_list::num_nodes = 0; | |
67 | // The total number of calls to Free_list::remove. | |
68 | unsigned int Free_list::num_removes = 0; | |
69 | // The total number of nodes visited during calls to Free_list::remove. | |
70 | unsigned int Free_list::num_remove_visits = 0; | |
71 | // The total number of calls to Free_list::allocate. | |
72 | unsigned int Free_list::num_allocates = 0; | |
73 | // The total number of nodes visited during calls to Free_list::allocate. | |
74 | unsigned int Free_list::num_allocate_visits = 0; | |
75 | ||
76 | // Initialize the free list. Creates a single free list node that | |
77 | // describes the entire region of length LEN. If EXTEND is true, | |
78 | // allocate() is allowed to extend the region beyond its initial | |
79 | // length. | |
80 | ||
81 | void | |
82 | Free_list::init(off_t len, bool extend) | |
83 | { | |
84 | this->list_.push_front(Free_list_node(0, len)); | |
85 | this->last_remove_ = this->list_.begin(); | |
86 | this->extend_ = extend; | |
87 | this->length_ = len; | |
88 | ++Free_list::num_lists; | |
89 | ++Free_list::num_nodes; | |
90 | } | |
91 | ||
92 | // Remove a chunk from the free list. Because we start with a single | |
93 | // node that covers the entire section, and remove chunks from it one | |
94 | // at a time, we do not need to coalesce chunks or handle cases that | |
95 | // span more than one free node. We expect to remove chunks from the | |
96 | // free list in order, and we expect to have only a few chunks of free | |
97 | // space left (corresponding to files that have changed since the last | |
98 | // incremental link), so a simple linear list should provide sufficient | |
99 | // performance. | |
100 | ||
101 | void | |
102 | Free_list::remove(off_t start, off_t end) | |
103 | { | |
104 | if (start == end) | |
105 | return; | |
106 | gold_assert(start < end); | |
107 | ||
108 | ++Free_list::num_removes; | |
109 | ||
110 | Iterator p = this->last_remove_; | |
111 | if (p->start_ > start) | |
112 | p = this->list_.begin(); | |
113 | ||
114 | for (; p != this->list_.end(); ++p) | |
115 | { | |
116 | ++Free_list::num_remove_visits; | |
117 | // Find a node that wholly contains the indicated region. | |
118 | if (p->start_ <= start && p->end_ >= end) | |
119 | { | |
120 | // Case 1: the indicated region spans the whole node. | |
121 | // Add some fuzz to avoid creating tiny free chunks. | |
122 | if (p->start_ + 3 >= start && p->end_ <= end + 3) | |
123 | p = this->list_.erase(p); | |
124 | // Case 2: remove a chunk from the start of the node. | |
125 | else if (p->start_ + 3 >= start) | |
126 | p->start_ = end; | |
127 | // Case 3: remove a chunk from the end of the node. | |
128 | else if (p->end_ <= end + 3) | |
129 | p->end_ = start; | |
130 | // Case 4: remove a chunk from the middle, and split | |
131 | // the node into two. | |
132 | else | |
133 | { | |
134 | Free_list_node newnode(p->start_, start); | |
135 | p->start_ = end; | |
136 | this->list_.insert(p, newnode); | |
137 | ++Free_list::num_nodes; | |
138 | } | |
139 | this->last_remove_ = p; | |
140 | return; | |
141 | } | |
142 | } | |
143 | ||
144 | // Did not find a node containing the given chunk. This could happen | |
145 | // because a small chunk was already removed due to the fuzz. | |
146 | gold_debug(DEBUG_INCREMENTAL, | |
147 | "Free_list::remove(%d,%d) not found", | |
148 | static_cast<int>(start), static_cast<int>(end)); | |
149 | } | |
150 | ||
151 | // Allocate a chunk of size LEN from the free list. Returns -1ULL | |
152 | // if a sufficiently large chunk of free space is not found. | |
153 | // We use a simple first-fit algorithm. | |
154 | ||
155 | off_t | |
156 | Free_list::allocate(off_t len, uint64_t align, off_t minoff) | |
157 | { | |
158 | gold_debug(DEBUG_INCREMENTAL, | |
2e702c99 RM |
159 | "Free_list::allocate(%08lx, %d, %08lx)", |
160 | static_cast<long>(len), static_cast<int>(align), | |
161 | static_cast<long>(minoff)); | |
cdc29364 CC |
162 | if (len == 0) |
163 | return align_address(minoff, align); | |
164 | ||
165 | ++Free_list::num_allocates; | |
166 | ||
8ea8cd50 CC |
167 | // We usually want to drop free chunks smaller than 4 bytes. |
168 | // If we need to guarantee a minimum hole size, though, we need | |
169 | // to keep track of all free chunks. | |
170 | const int fuzz = this->min_hole_ > 0 ? 0 : 3; | |
171 | ||
cdc29364 CC |
172 | for (Iterator p = this->list_.begin(); p != this->list_.end(); ++p) |
173 | { | |
174 | ++Free_list::num_allocate_visits; | |
175 | off_t start = p->start_ > minoff ? p->start_ : minoff; | |
176 | start = align_address(start, align); | |
177 | off_t end = start + len; | |
9fbd3822 CC |
178 | if (end > p->end_ && p->end_ == this->length_ && this->extend_) |
179 | { | |
180 | this->length_ = end; | |
181 | p->end_ = end; | |
182 | } | |
8ea8cd50 | 183 | if (end == p->end_ || (end <= p->end_ - this->min_hole_)) |
cdc29364 | 184 | { |
8ea8cd50 | 185 | if (p->start_ + fuzz >= start && p->end_ <= end + fuzz) |
cdc29364 | 186 | this->list_.erase(p); |
8ea8cd50 | 187 | else if (p->start_ + fuzz >= start) |
cdc29364 | 188 | p->start_ = end; |
8ea8cd50 | 189 | else if (p->end_ <= end + fuzz) |
cdc29364 CC |
190 | p->end_ = start; |
191 | else | |
192 | { | |
193 | Free_list_node newnode(p->start_, start); | |
194 | p->start_ = end; | |
195 | this->list_.insert(p, newnode); | |
196 | ++Free_list::num_nodes; | |
197 | } | |
198 | return start; | |
199 | } | |
200 | } | |
9fbd3822 CC |
201 | if (this->extend_) |
202 | { | |
203 | off_t start = align_address(this->length_, align); | |
204 | this->length_ = start + len; | |
205 | return start; | |
206 | } | |
cdc29364 CC |
207 | return -1; |
208 | } | |
209 | ||
210 | // Dump the free list (for debugging). | |
211 | void | |
212 | Free_list::dump() | |
213 | { | |
214 | gold_info("Free list:\n start end length\n"); | |
215 | for (Iterator p = this->list_.begin(); p != this->list_.end(); ++p) | |
216 | gold_info(" %08lx %08lx %08lx", static_cast<long>(p->start_), | |
217 | static_cast<long>(p->end_), | |
218 | static_cast<long>(p->end_ - p->start_)); | |
219 | } | |
220 | ||
221 | // Print the statistics for the free lists. | |
222 | void | |
223 | Free_list::print_stats() | |
224 | { | |
225 | fprintf(stderr, _("%s: total free lists: %u\n"), | |
2e702c99 | 226 | program_name, Free_list::num_lists); |
cdc29364 | 227 | fprintf(stderr, _("%s: total free list nodes: %u\n"), |
2e702c99 | 228 | program_name, Free_list::num_nodes); |
cdc29364 | 229 | fprintf(stderr, _("%s: calls to Free_list::remove: %u\n"), |
2e702c99 | 230 | program_name, Free_list::num_removes); |
cdc29364 | 231 | fprintf(stderr, _("%s: nodes visited: %u\n"), |
2e702c99 | 232 | program_name, Free_list::num_remove_visits); |
cdc29364 | 233 | fprintf(stderr, _("%s: calls to Free_list::allocate: %u\n"), |
2e702c99 | 234 | program_name, Free_list::num_allocates); |
cdc29364 | 235 | fprintf(stderr, _("%s: nodes visited: %u\n"), |
2e702c99 | 236 | program_name, Free_list::num_allocate_visits); |
cdc29364 CC |
237 | } |
238 | ||
20e6d0d6 DK |
239 | // Layout::Relaxation_debug_check methods. |
240 | ||
241 | // Check that sections and special data are in reset states. | |
242 | // We do not save states for Output_sections and special Output_data. | |
243 | // So we check that they have not assigned any addresses or offsets. | |
244 | // clean_up_after_relaxation simply resets their addresses and offsets. | |
245 | void | |
246 | Layout::Relaxation_debug_check::check_output_data_for_reset_values( | |
247 | const Layout::Section_list& sections, | |
248 | const Layout::Data_list& special_outputs) | |
249 | { | |
250 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
251 | p != sections.end(); | |
252 | ++p) | |
253 | gold_assert((*p)->address_and_file_offset_have_reset_values()); | |
254 | ||
255 | for(Layout::Data_list::const_iterator p = special_outputs.begin(); | |
256 | p != special_outputs.end(); | |
257 | ++p) | |
258 | gold_assert((*p)->address_and_file_offset_have_reset_values()); | |
259 | } | |
2e702c99 | 260 | |
20e6d0d6 DK |
261 | // Save information of SECTIONS for checking later. |
262 | ||
263 | void | |
264 | Layout::Relaxation_debug_check::read_sections( | |
265 | const Layout::Section_list& sections) | |
266 | { | |
267 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
268 | p != sections.end(); | |
269 | ++p) | |
270 | { | |
271 | Output_section* os = *p; | |
272 | Section_info info; | |
273 | info.output_section = os; | |
274 | info.address = os->is_address_valid() ? os->address() : 0; | |
275 | info.data_size = os->is_data_size_valid() ? os->data_size() : -1; | |
276 | info.offset = os->is_offset_valid()? os->offset() : -1 ; | |
277 | this->section_infos_.push_back(info); | |
278 | } | |
279 | } | |
280 | ||
281 | // Verify SECTIONS using previously recorded information. | |
282 | ||
283 | void | |
284 | Layout::Relaxation_debug_check::verify_sections( | |
285 | const Layout::Section_list& sections) | |
286 | { | |
287 | size_t i = 0; | |
288 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
289 | p != sections.end(); | |
290 | ++p, ++i) | |
291 | { | |
292 | Output_section* os = *p; | |
293 | uint64_t address = os->is_address_valid() ? os->address() : 0; | |
294 | off_t data_size = os->is_data_size_valid() ? os->data_size() : -1; | |
295 | off_t offset = os->is_offset_valid()? os->offset() : -1 ; | |
296 | ||
297 | if (i >= this->section_infos_.size()) | |
298 | { | |
299 | gold_fatal("Section_info of %s missing.\n", os->name()); | |
300 | } | |
301 | const Section_info& info = this->section_infos_[i]; | |
302 | if (os != info.output_section) | |
303 | gold_fatal("Section order changed. Expecting %s but see %s\n", | |
304 | info.output_section->name(), os->name()); | |
305 | if (address != info.address | |
306 | || data_size != info.data_size | |
307 | || offset != info.offset) | |
308 | gold_fatal("Section %s changed.\n", os->name()); | |
309 | } | |
310 | } | |
311 | ||
92e059d8 | 312 | // Layout_task_runner methods. |
a2fb1b05 ILT |
313 | |
314 | // Lay out the sections. This is called after all the input objects | |
315 | // have been read. | |
316 | ||
317 | void | |
17a1d0a9 | 318 | Layout_task_runner::run(Workqueue* workqueue, const Task* task) |
a2fb1b05 | 319 | { |
dc3714f3 AM |
320 | // See if any of the input definitions violate the One Definition Rule. |
321 | // TODO: if this is too slow, do this as a task, rather than inline. | |
322 | this->symtab_->detect_odr_violations(task, this->options_.output_file_name()); | |
323 | ||
94a3fc8b CC |
324 | Layout* layout = this->layout_; |
325 | off_t file_size = layout->finalize(this->input_objects_, | |
326 | this->symtab_, | |
2e702c99 | 327 | this->target_, |
94a3fc8b | 328 | task); |
61ba1cf9 ILT |
329 | |
330 | // Now we know the final size of the output file and we know where | |
331 | // each piece of information goes. | |
7d9e3d98 ILT |
332 | |
333 | if (this->mapfile_ != NULL) | |
334 | { | |
335 | this->mapfile_->print_discarded_sections(this->input_objects_); | |
94a3fc8b | 336 | layout->print_to_mapfile(this->mapfile_); |
7d9e3d98 ILT |
337 | } |
338 | ||
cdc29364 | 339 | Output_file* of; |
94a3fc8b | 340 | if (layout->incremental_base() == NULL) |
cdc29364 CC |
341 | { |
342 | of = new Output_file(parameters->options().output_file_name()); | |
343 | if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF) | |
344 | of->set_is_temporary(); | |
345 | of->open(file_size); | |
346 | } | |
347 | else | |
348 | { | |
94a3fc8b CC |
349 | of = layout->incremental_base()->output_file(); |
350 | ||
351 | // Apply the incremental relocations for symbols whose values | |
352 | // have changed. We do this before we resize the file and start | |
353 | // writing anything else to it, so that we can read the old | |
354 | // incremental information from the file before (possibly) | |
355 | // overwriting it. | |
356 | if (parameters->incremental_update()) | |
2e702c99 RM |
357 | layout->incremental_base()->apply_incremental_relocs(this->symtab_, |
358 | this->layout_, | |
94a3fc8b CC |
359 | of); |
360 | ||
cdc29364 CC |
361 | of->resize(file_size); |
362 | } | |
61ba1cf9 ILT |
363 | |
364 | // Queue up the final set of tasks. | |
365 | gold::queue_final_tasks(this->options_, this->input_objects_, | |
94a3fc8b | 366 | this->symtab_, layout, workqueue, of); |
a2fb1b05 ILT |
367 | } |
368 | ||
369 | // Layout methods. | |
370 | ||
2ea97941 | 371 | Layout::Layout(int number_of_input_files, Script_options* script_options) |
e55bde5e | 372 | : number_of_input_files_(number_of_input_files), |
2ea97941 | 373 | script_options_(script_options), |
d491d34e ILT |
374 | namepool_(), |
375 | sympool_(), | |
376 | dynpool_(), | |
377 | signatures_(), | |
378 | section_name_map_(), | |
379 | segment_list_(), | |
380 | section_list_(), | |
381 | unattached_section_list_(), | |
d491d34e ILT |
382 | special_output_list_(), |
383 | section_headers_(NULL), | |
384 | tls_segment_(NULL), | |
9f1d377b | 385 | relro_segment_(NULL), |
10b4f102 | 386 | interp_segment_(NULL), |
1a2dff53 | 387 | increase_relro_(0), |
d491d34e ILT |
388 | symtab_section_(NULL), |
389 | symtab_xindex_(NULL), | |
390 | dynsym_section_(NULL), | |
391 | dynsym_xindex_(NULL), | |
392 | dynamic_section_(NULL), | |
f0ba79e2 | 393 | dynamic_symbol_(NULL), |
d491d34e ILT |
394 | dynamic_data_(NULL), |
395 | eh_frame_section_(NULL), | |
396 | eh_frame_data_(NULL), | |
397 | added_eh_frame_data_(false), | |
398 | eh_frame_hdr_section_(NULL), | |
c1027032 | 399 | gdb_index_data_(NULL), |
d491d34e | 400 | build_id_note_(NULL), |
62b01cb5 ILT |
401 | debug_abbrev_(NULL), |
402 | debug_info_(NULL), | |
d491d34e ILT |
403 | group_signatures_(), |
404 | output_file_size_(-1), | |
d7bb5745 | 405 | have_added_input_section_(false), |
e55bde5e | 406 | sections_are_attached_(false), |
35cdfc9a ILT |
407 | input_requires_executable_stack_(false), |
408 | input_with_gnu_stack_note_(false), | |
535890bb | 409 | input_without_gnu_stack_note_(false), |
17a1d0a9 | 410 | has_static_tls_(false), |
e55bde5e | 411 | any_postprocessing_sections_(false), |
3ce2c28e | 412 | resized_signatures_(false), |
1518dc8f | 413 | have_stabstr_section_(false), |
e9552f7e | 414 | section_ordering_specified_(false), |
16164a6b | 415 | unique_segment_for_sections_specified_(false), |
20e6d0d6 DK |
416 | incremental_inputs_(NULL), |
417 | record_output_section_data_from_script_(false), | |
418 | script_output_section_data_list_(), | |
419 | segment_states_(NULL), | |
cdc29364 | 420 | relaxation_debug_check_(NULL), |
f0558624 | 421 | section_order_map_(), |
16164a6b | 422 | section_segment_map_(), |
e9552f7e ST |
423 | input_section_position_(), |
424 | input_section_glob_(), | |
cdc29364 CC |
425 | incremental_base_(NULL), |
426 | free_list_() | |
54dc6425 ILT |
427 | { |
428 | // Make space for more than enough segments for a typical file. | |
429 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
430 | this->segment_list_.reserve(12); |
431 | ||
27bc2bce ILT |
432 | // We expect two unattached Output_data objects: the file header and |
433 | // the segment headers. | |
434 | this->special_output_list_.reserve(2); | |
3ce2c28e ILT |
435 | |
436 | // Initialize structure needed for an incremental build. | |
8c21d9d3 | 437 | if (parameters->incremental()) |
3ce2c28e | 438 | this->incremental_inputs_ = new Incremental_inputs; |
f7c8a183 ILT |
439 | |
440 | // The section name pool is worth optimizing in all cases, because | |
441 | // it is small, but there are often overlaps due to .rel sections. | |
442 | this->namepool_.set_optimize(); | |
54dc6425 ILT |
443 | } |
444 | ||
cdc29364 CC |
445 | // For incremental links, record the base file to be modified. |
446 | ||
447 | void | |
448 | Layout::set_incremental_base(Incremental_binary* base) | |
449 | { | |
450 | this->incremental_base_ = base; | |
451 | this->free_list_.init(base->output_file()->filesize(), true); | |
452 | } | |
453 | ||
a2fb1b05 ILT |
454 | // Hash a key we use to look up an output section mapping. |
455 | ||
456 | size_t | |
457 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
458 | { | |
f0641a0b | 459 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
460 | } |
461 | ||
fb1b895d CC |
462 | // These are the debug sections that are actually used by gdb. |
463 | // Currently, we've checked versions of gdb up to and including 7.4. | |
464 | // We only check the part of the name that follows ".debug_" or | |
465 | // ".zdebug_". | |
02d2ba74 ILT |
466 | |
467 | static const char* gdb_sections[] = | |
fb1b895d CC |
468 | { |
469 | "abbrev", | |
470 | "addr", // Fission extension | |
471 | // "aranges", // not used by gdb as of 7.4 | |
472 | "frame", | |
473 | "info", | |
474 | "types", | |
475 | "line", | |
476 | "loc", | |
477 | "macinfo", | |
478 | "macro", | |
479 | // "pubnames", // not used by gdb as of 7.4 | |
480 | // "pubtypes", // not used by gdb as of 7.4 | |
481 | "ranges", | |
482 | "str", | |
02d2ba74 ILT |
483 | }; |
484 | ||
fb1b895d CC |
485 | // This is the minimum set of sections needed for line numbers. |
486 | ||
62b01cb5 | 487 | static const char* lines_only_debug_sections[] = |
fb1b895d CC |
488 | { |
489 | "abbrev", | |
490 | // "addr", // Fission extension | |
491 | // "aranges", // not used by gdb as of 7.4 | |
492 | // "frame", | |
493 | "info", | |
494 | // "types", | |
495 | "line", | |
496 | // "loc", | |
497 | // "macinfo", | |
498 | // "macro", | |
499 | // "pubnames", // not used by gdb as of 7.4 | |
500 | // "pubtypes", // not used by gdb as of 7.4 | |
501 | // "ranges", | |
502 | "str", | |
503 | }; | |
504 | ||
505 | // These sections are the DWARF fast-lookup tables, and are not needed | |
506 | // when building a .gdb_index section. | |
507 | ||
508 | static const char* gdb_fast_lookup_sections[] = | |
509 | { | |
510 | "aranges", | |
511 | "pubnames", | |
512 | "pubtypes", | |
62b01cb5 ILT |
513 | }; |
514 | ||
fb1b895d CC |
515 | // Returns whether the given debug section is in the list of |
516 | // debug-sections-used-by-some-version-of-gdb. SUFFIX is the | |
517 | // portion of the name following ".debug_" or ".zdebug_". | |
518 | ||
02d2ba74 | 519 | static inline bool |
fb1b895d | 520 | is_gdb_debug_section(const char* suffix) |
02d2ba74 ILT |
521 | { |
522 | // We can do this faster: binary search or a hashtable. But why bother? | |
523 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) | |
fb1b895d | 524 | if (strcmp(suffix, gdb_sections[i]) == 0) |
02d2ba74 ILT |
525 | return true; |
526 | return false; | |
527 | } | |
528 | ||
fb1b895d CC |
529 | // Returns whether the given section is needed for lines-only debugging. |
530 | ||
62b01cb5 | 531 | static inline bool |
fb1b895d | 532 | is_lines_only_debug_section(const char* suffix) |
62b01cb5 ILT |
533 | { |
534 | // We can do this faster: binary search or a hashtable. But why bother? | |
535 | for (size_t i = 0; | |
536 | i < sizeof(lines_only_debug_sections)/sizeof(*lines_only_debug_sections); | |
537 | ++i) | |
fb1b895d CC |
538 | if (strcmp(suffix, lines_only_debug_sections[i]) == 0) |
539 | return true; | |
540 | return false; | |
541 | } | |
542 | ||
543 | // Returns whether the given section is a fast-lookup section that | |
544 | // will not be needed when building a .gdb_index section. | |
545 | ||
546 | static inline bool | |
547 | is_gdb_fast_lookup_section(const char* suffix) | |
548 | { | |
549 | // We can do this faster: binary search or a hashtable. But why bother? | |
550 | for (size_t i = 0; | |
551 | i < sizeof(gdb_fast_lookup_sections)/sizeof(*gdb_fast_lookup_sections); | |
552 | ++i) | |
553 | if (strcmp(suffix, gdb_fast_lookup_sections[i]) == 0) | |
62b01cb5 ILT |
554 | return true; |
555 | return false; | |
556 | } | |
557 | ||
6fc6ea19 CC |
558 | // Sometimes we compress sections. This is typically done for |
559 | // sections that are not part of normal program execution (such as | |
560 | // .debug_* sections), and where the readers of these sections know | |
561 | // how to deal with compressed sections. This routine doesn't say for | |
562 | // certain whether we'll compress -- it depends on commandline options | |
563 | // as well -- just whether this section is a candidate for compression. | |
564 | // (The Output_compressed_section class decides whether to compress | |
565 | // a given section, and picks the name of the compressed section.) | |
566 | ||
567 | static bool | |
568 | is_compressible_debug_section(const char* secname) | |
569 | { | |
570 | return (is_prefix_of(".debug", secname)); | |
571 | } | |
572 | ||
573 | // We may see compressed debug sections in input files. Return TRUE | |
574 | // if this is the name of a compressed debug section. | |
575 | ||
576 | bool | |
577 | is_compressed_debug_section(const char* secname) | |
578 | { | |
579 | return (is_prefix_of(".zdebug", secname)); | |
580 | } | |
581 | ||
a2fb1b05 ILT |
582 | // Whether to include this section in the link. |
583 | ||
584 | template<int size, bool big_endian> | |
585 | bool | |
6fa2a40b | 586 | Layout::include_section(Sized_relobj_file<size, big_endian>*, const char* name, |
a2fb1b05 ILT |
587 | const elfcpp::Shdr<size, big_endian>& shdr) |
588 | { | |
ae034989 ST |
589 | if (!parameters->options().relocatable() |
590 | && (shdr.get_sh_flags() & elfcpp::SHF_EXCLUDE)) | |
fd06b4aa CC |
591 | return false; |
592 | ||
a2fb1b05 ILT |
593 | switch (shdr.get_sh_type()) |
594 | { | |
595 | case elfcpp::SHT_NULL: | |
596 | case elfcpp::SHT_SYMTAB: | |
597 | case elfcpp::SHT_DYNSYM: | |
a2fb1b05 ILT |
598 | case elfcpp::SHT_HASH: |
599 | case elfcpp::SHT_DYNAMIC: | |
600 | case elfcpp::SHT_SYMTAB_SHNDX: | |
601 | return false; | |
602 | ||
5cb66f97 ILT |
603 | case elfcpp::SHT_STRTAB: |
604 | // Discard the sections which have special meanings in the ELF | |
605 | // ABI. Keep others (e.g., .stabstr). We could also do this by | |
606 | // checking the sh_link fields of the appropriate sections. | |
607 | return (strcmp(name, ".dynstr") != 0 | |
608 | && strcmp(name, ".strtab") != 0 | |
609 | && strcmp(name, ".shstrtab") != 0); | |
610 | ||
a2fb1b05 ILT |
611 | case elfcpp::SHT_RELA: |
612 | case elfcpp::SHT_REL: | |
613 | case elfcpp::SHT_GROUP: | |
7019cd25 ILT |
614 | // If we are emitting relocations these should be handled |
615 | // elsewhere. | |
1e2bee4f | 616 | gold_assert(!parameters->options().relocatable()); |
6a74a719 | 617 | return false; |
a2fb1b05 | 618 | |
9e2dcb77 | 619 | case elfcpp::SHT_PROGBITS: |
8851ecca | 620 | if (parameters->options().strip_debug() |
9e2dcb77 ILT |
621 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
622 | { | |
e94cf127 | 623 | if (is_debug_info_section(name)) |
9e2dcb77 ILT |
624 | return false; |
625 | } | |
62b01cb5 ILT |
626 | if (parameters->options().strip_debug_non_line() |
627 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
628 | { | |
629 | // Debugging sections can only be recognized by name. | |
fb1b895d CC |
630 | if (is_prefix_of(".debug_", name) |
631 | && !is_lines_only_debug_section(name + 7)) | |
632 | return false; | |
633 | if (is_prefix_of(".zdebug_", name) | |
634 | && !is_lines_only_debug_section(name + 8)) | |
62b01cb5 ILT |
635 | return false; |
636 | } | |
8851ecca | 637 | if (parameters->options().strip_debug_gdb() |
02d2ba74 ILT |
638 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
639 | { | |
640 | // Debugging sections can only be recognized by name. | |
fb1b895d CC |
641 | if (is_prefix_of(".debug_", name) |
642 | && !is_gdb_debug_section(name + 7)) | |
643 | return false; | |
644 | if (is_prefix_of(".zdebug_", name) | |
645 | && !is_gdb_debug_section(name + 8)) | |
646 | return false; | |
647 | } | |
648 | if (parameters->options().gdb_index() | |
649 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
650 | { | |
651 | // When building .gdb_index, we can strip .debug_pubnames, | |
652 | // .debug_pubtypes, and .debug_aranges sections. | |
653 | if (is_prefix_of(".debug_", name) | |
654 | && is_gdb_fast_lookup_section(name + 7)) | |
655 | return false; | |
656 | if (is_prefix_of(".zdebug_", name) | |
657 | && is_gdb_fast_lookup_section(name + 8)) | |
02d2ba74 ILT |
658 | return false; |
659 | } | |
fd06b4aa | 660 | if (parameters->options().strip_lto_sections() |
2e702c99 RM |
661 | && !parameters->options().relocatable() |
662 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
663 | { | |
664 | // Ignore LTO sections containing intermediate code. | |
665 | if (is_prefix_of(".gnu.lto_", name)) | |
666 | return false; | |
667 | } | |
6b7dd3f3 ILT |
668 | // The GNU linker strips .gnu_debuglink sections, so we do too. |
669 | // This is a feature used to keep debugging information in | |
670 | // separate files. | |
671 | if (strcmp(name, ".gnu_debuglink") == 0) | |
672 | return false; | |
9e2dcb77 ILT |
673 | return true; |
674 | ||
a2fb1b05 | 675 | default: |
a2fb1b05 ILT |
676 | return true; |
677 | } | |
678 | } | |
679 | ||
ead1e424 | 680 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 681 | |
a2fb1b05 | 682 | Output_section* |
ead1e424 | 683 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 684 | { |
a445fddf ILT |
685 | for (Section_list::const_iterator p = this->section_list_.begin(); |
686 | p != this->section_list_.end(); | |
ead1e424 | 687 | ++p) |
a445fddf ILT |
688 | if (strcmp((*p)->name(), name) == 0) |
689 | return *p; | |
ead1e424 ILT |
690 | return NULL; |
691 | } | |
a2fb1b05 | 692 | |
ead1e424 ILT |
693 | // Return an output segment of type TYPE, with segment flags SET set |
694 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 695 | |
ead1e424 ILT |
696 | Output_segment* |
697 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
698 | elfcpp::Elf_Word clear) const | |
699 | { | |
700 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
701 | p != this->segment_list_.end(); | |
702 | ++p) | |
703 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
704 | && ((*p)->flags() & set) == set | |
705 | && ((*p)->flags() & clear) == 0) | |
706 | return *p; | |
707 | return NULL; | |
708 | } | |
a2fb1b05 | 709 | |
487b39df ILT |
710 | // When we put a .ctors or .dtors section with more than one word into |
711 | // a .init_array or .fini_array section, we need to reverse the words | |
712 | // in the .ctors/.dtors section. This is because .init_array executes | |
713 | // constructors front to back, where .ctors executes them back to | |
714 | // front, and vice-versa for .fini_array/.dtors. Although we do want | |
715 | // to remap .ctors/.dtors into .init_array/.fini_array because it can | |
716 | // be more efficient, we don't want to change the order in which | |
717 | // constructors/destructors are run. This set just keeps track of | |
718 | // these sections which need to be reversed. It is only changed by | |
719 | // Layout::layout. It should be a private member of Layout, but that | |
720 | // would require layout.h to #include object.h to get the definition | |
721 | // of Section_id. | |
722 | static Unordered_set<Section_id, Section_id_hash> ctors_sections_in_init_array; | |
723 | ||
724 | // Return whether OBJECT/SHNDX is a .ctors/.dtors section mapped to a | |
725 | // .init_array/.fini_array section. | |
726 | ||
727 | bool | |
728 | Layout::is_ctors_in_init_array(Relobj* relobj, unsigned int shndx) const | |
729 | { | |
730 | return (ctors_sections_in_init_array.find(Section_id(relobj, shndx)) | |
731 | != ctors_sections_in_init_array.end()); | |
732 | } | |
733 | ||
ead1e424 | 734 | // Return the output section to use for section NAME with type TYPE |
a445fddf | 735 | // and section flags FLAGS. NAME must be canonicalized in the string |
10b4f102 ILT |
736 | // pool, and NAME_KEY is the key. ORDER is where this should appear |
737 | // in the output sections. IS_RELRO is true for a relro section. | |
a2fb1b05 | 738 | |
ead1e424 | 739 | Output_section* |
f0641a0b | 740 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
f5c870d2 | 741 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, |
22f0da72 | 742 | Output_section_order order, bool is_relro) |
ead1e424 | 743 | { |
5393d741 ILT |
744 | elfcpp::Elf_Word lookup_type = type; |
745 | ||
746 | // For lookup purposes, treat INIT_ARRAY, FINI_ARRAY, and | |
747 | // PREINIT_ARRAY like PROGBITS. This ensures that we combine | |
748 | // .init_array, .fini_array, and .preinit_array sections by name | |
749 | // whatever their type in the input file. We do this because the | |
750 | // types are not always right in the input files. | |
751 | if (lookup_type == elfcpp::SHT_INIT_ARRAY | |
752 | || lookup_type == elfcpp::SHT_FINI_ARRAY | |
753 | || lookup_type == elfcpp::SHT_PREINIT_ARRAY) | |
754 | lookup_type = elfcpp::SHT_PROGBITS; | |
755 | ||
154e0e9a ILT |
756 | elfcpp::Elf_Xword lookup_flags = flags; |
757 | ||
758 | // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine | |
759 | // read-write with read-only sections. Some other ELF linkers do | |
760 | // not do this. FIXME: Perhaps there should be an option | |
761 | // controlling this. | |
762 | lookup_flags &= ~(elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
763 | ||
5393d741 | 764 | const Key key(name_key, std::make_pair(lookup_type, lookup_flags)); |
a2fb1b05 ILT |
765 | const std::pair<Key, Output_section*> v(key, NULL); |
766 | std::pair<Section_name_map::iterator, bool> ins( | |
767 | this->section_name_map_.insert(v)); | |
768 | ||
a2fb1b05 | 769 | if (!ins.second) |
ead1e424 | 770 | return ins.first->second; |
a2fb1b05 ILT |
771 | else |
772 | { | |
773 | // This is the first time we've seen this name/type/flags | |
4e2b1697 ILT |
774 | // combination. For compatibility with the GNU linker, we |
775 | // combine sections with contents and zero flags with sections | |
776 | // with non-zero flags. This is a workaround for cases where | |
777 | // assembler code forgets to set section flags. FIXME: Perhaps | |
778 | // there should be an option to control this. | |
15cf077e | 779 | Output_section* os = NULL; |
4e2b1697 | 780 | |
5393d741 | 781 | if (lookup_type == elfcpp::SHT_PROGBITS) |
15cf077e | 782 | { |
2e702c99 RM |
783 | if (flags == 0) |
784 | { | |
785 | Output_section* same_name = this->find_output_section(name); | |
786 | if (same_name != NULL | |
787 | && (same_name->type() == elfcpp::SHT_PROGBITS | |
5393d741 ILT |
788 | || same_name->type() == elfcpp::SHT_INIT_ARRAY |
789 | || same_name->type() == elfcpp::SHT_FINI_ARRAY | |
790 | || same_name->type() == elfcpp::SHT_PREINIT_ARRAY) | |
2e702c99 RM |
791 | && (same_name->flags() & elfcpp::SHF_TLS) == 0) |
792 | os = same_name; | |
793 | } | |
794 | else if ((flags & elfcpp::SHF_TLS) == 0) | |
795 | { | |
796 | elfcpp::Elf_Xword zero_flags = 0; | |
797 | const Key zero_key(name_key, std::make_pair(lookup_type, | |
5393d741 | 798 | zero_flags)); |
2e702c99 RM |
799 | Section_name_map::iterator p = |
800 | this->section_name_map_.find(zero_key); | |
801 | if (p != this->section_name_map_.end()) | |
154e0e9a | 802 | os = p->second; |
2e702c99 | 803 | } |
15cf077e | 804 | } |
4e2b1697 | 805 | |
15cf077e | 806 | if (os == NULL) |
22f0da72 ILT |
807 | os = this->make_output_section(name, type, flags, order, is_relro); |
808 | ||
a2fb1b05 | 809 | ins.first->second = os; |
ead1e424 | 810 | return os; |
a2fb1b05 | 811 | } |
ead1e424 ILT |
812 | } |
813 | ||
b9b2ae8b NC |
814 | // Returns TRUE iff NAME (an input section from RELOBJ) will |
815 | // be mapped to an output section that should be KEPT. | |
816 | ||
817 | bool | |
818 | Layout::keep_input_section(const Relobj* relobj, const char* name) | |
819 | { | |
820 | if (! this->script_options_->saw_sections_clause()) | |
821 | return false; | |
822 | ||
823 | Script_sections* ss = this->script_options_->script_sections(); | |
824 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
825 | Output_section** output_section_slot; | |
826 | Script_sections::Section_type script_section_type; | |
827 | bool keep; | |
828 | ||
829 | name = ss->output_section_name(file_name, name, &output_section_slot, | |
830 | &script_section_type, &keep); | |
831 | return name != NULL && keep; | |
832 | } | |
833 | ||
16164a6b ST |
834 | // Clear the input section flags that should not be copied to the |
835 | // output section. | |
836 | ||
837 | elfcpp::Elf_Xword | |
838 | Layout::get_output_section_flags(elfcpp::Elf_Xword input_section_flags) | |
839 | { | |
840 | // Some flags in the input section should not be automatically | |
841 | // copied to the output section. | |
842 | input_section_flags &= ~ (elfcpp::SHF_INFO_LINK | |
843 | | elfcpp::SHF_GROUP | |
844 | | elfcpp::SHF_MERGE | |
845 | | elfcpp::SHF_STRINGS); | |
846 | ||
847 | // We only clear the SHF_LINK_ORDER flag in for | |
848 | // a non-relocatable link. | |
849 | if (!parameters->options().relocatable()) | |
850 | input_section_flags &= ~elfcpp::SHF_LINK_ORDER; | |
851 | ||
852 | return input_section_flags; | |
853 | } | |
854 | ||
a445fddf ILT |
855 | // Pick the output section to use for section NAME, in input file |
856 | // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a | |
154e0e9a ILT |
857 | // linker created section. IS_INPUT_SECTION is true if we are |
858 | // choosing an output section for an input section found in a input | |
10b4f102 ILT |
859 | // file. ORDER is where this section should appear in the output |
860 | // sections. IS_RELRO is true for a relro section. This will return | |
861 | // NULL if the input section should be discarded. | |
a445fddf ILT |
862 | |
863 | Output_section* | |
864 | Layout::choose_output_section(const Relobj* relobj, const char* name, | |
865 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
22f0da72 ILT |
866 | bool is_input_section, Output_section_order order, |
867 | bool is_relro) | |
a445fddf | 868 | { |
154e0e9a ILT |
869 | // We should not see any input sections after we have attached |
870 | // sections to segments. | |
871 | gold_assert(!is_input_section || !this->sections_are_attached_); | |
872 | ||
16164a6b | 873 | flags = this->get_output_section_flags(flags); |
c9484ea5 | 874 | |
a445fddf ILT |
875 | if (this->script_options_->saw_sections_clause()) |
876 | { | |
877 | // We are using a SECTIONS clause, so the output section is | |
878 | // chosen based only on the name. | |
879 | ||
880 | Script_sections* ss = this->script_options_->script_sections(); | |
881 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
882 | Output_section** output_section_slot; | |
1e5d2fb1 | 883 | Script_sections::Section_type script_section_type; |
7f8cd844 | 884 | const char* orig_name = name; |
b9b2ae8b | 885 | bool keep; |
1e5d2fb1 | 886 | name = ss->output_section_name(file_name, name, &output_section_slot, |
b9b2ae8b NC |
887 | &script_section_type, &keep); |
888 | ||
a445fddf ILT |
889 | if (name == NULL) |
890 | { | |
7f8cd844 NC |
891 | gold_debug(DEBUG_SCRIPT, _("Unable to create output section '%s' " |
892 | "because it is not allowed by the " | |
893 | "SECTIONS clause of the linker script"), | |
894 | orig_name); | |
a445fddf ILT |
895 | // The SECTIONS clause says to discard this input section. |
896 | return NULL; | |
897 | } | |
898 | ||
1e5d2fb1 DK |
899 | // We can only handle script section types ST_NONE and ST_NOLOAD. |
900 | switch (script_section_type) | |
901 | { | |
902 | case Script_sections::ST_NONE: | |
903 | break; | |
904 | case Script_sections::ST_NOLOAD: | |
905 | flags &= elfcpp::SHF_ALLOC; | |
906 | break; | |
907 | default: | |
908 | gold_unreachable(); | |
909 | } | |
910 | ||
a445fddf ILT |
911 | // If this is an orphan section--one not mentioned in the linker |
912 | // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the | |
913 | // default processing below. | |
914 | ||
915 | if (output_section_slot != NULL) | |
916 | { | |
917 | if (*output_section_slot != NULL) | |
9c547ec3 ILT |
918 | { |
919 | (*output_section_slot)->update_flags_for_input_section(flags); | |
920 | return *output_section_slot; | |
921 | } | |
a445fddf ILT |
922 | |
923 | // We don't put sections found in the linker script into | |
924 | // SECTION_NAME_MAP_. That keeps us from getting confused | |
925 | // if an orphan section is mapped to a section with the same | |
926 | // name as one in the linker script. | |
927 | ||
928 | name = this->namepool_.add(name, false, NULL); | |
929 | ||
22f0da72 ILT |
930 | Output_section* os = this->make_output_section(name, type, flags, |
931 | order, is_relro); | |
932 | ||
a445fddf | 933 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
934 | |
935 | // Special handling for NOLOAD sections. | |
936 | if (script_section_type == Script_sections::ST_NOLOAD) | |
937 | { | |
938 | os->set_is_noload(); | |
939 | ||
940 | // The constructor of Output_section sets addresses of non-ALLOC | |
941 | // sections to 0 by default. We don't want that for NOLOAD | |
942 | // sections even if they have no SHF_ALLOC flag. | |
943 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0 | |
944 | && os->is_address_valid()) | |
945 | { | |
946 | gold_assert(os->address() == 0 | |
947 | && !os->is_offset_valid() | |
948 | && !os->is_data_size_valid()); | |
949 | os->reset_address_and_file_offset(); | |
950 | } | |
951 | } | |
952 | ||
a445fddf ILT |
953 | *output_section_slot = os; |
954 | return os; | |
955 | } | |
956 | } | |
957 | ||
958 | // FIXME: Handle SHF_OS_NONCONFORMING somewhere. | |
959 | ||
6fc6ea19 CC |
960 | size_t len = strlen(name); |
961 | char* uncompressed_name = NULL; | |
962 | ||
963 | // Compressed debug sections should be mapped to the corresponding | |
964 | // uncompressed section. | |
965 | if (is_compressed_debug_section(name)) | |
966 | { | |
967 | uncompressed_name = new char[len]; | |
968 | uncompressed_name[0] = '.'; | |
969 | gold_assert(name[0] == '.' && name[1] == 'z'); | |
970 | strncpy(&uncompressed_name[1], &name[2], len - 2); | |
971 | uncompressed_name[len - 1] = '\0'; | |
972 | len -= 1; | |
973 | name = uncompressed_name; | |
974 | } | |
975 | ||
a445fddf ILT |
976 | // Turn NAME from the name of the input section into the name of the |
977 | // output section. | |
401a9a73 CC |
978 | if (is_input_section |
979 | && !this->script_options_->saw_sections_clause() | |
980 | && !parameters->options().relocatable()) | |
921b5322 AM |
981 | { |
982 | const char *orig_name = name; | |
983 | name = parameters->target().output_section_name(relobj, name, &len); | |
984 | if (name == NULL) | |
985 | name = Layout::output_section_name(relobj, orig_name, &len); | |
986 | } | |
a445fddf ILT |
987 | |
988 | Stringpool::Key name_key; | |
989 | name = this->namepool_.add_with_length(name, len, true, &name_key); | |
990 | ||
6fc6ea19 CC |
991 | if (uncompressed_name != NULL) |
992 | delete[] uncompressed_name; | |
993 | ||
a445fddf ILT |
994 | // Find or make the output section. The output section is selected |
995 | // based on the section name, type, and flags. | |
22f0da72 | 996 | return this->get_output_section(name, name_key, type, flags, order, is_relro); |
a445fddf ILT |
997 | } |
998 | ||
cdc29364 CC |
999 | // For incremental links, record the initial fixed layout of a section |
1000 | // from the base file, and return a pointer to the Output_section. | |
1001 | ||
1002 | template<int size, bool big_endian> | |
1003 | Output_section* | |
1004 | Layout::init_fixed_output_section(const char* name, | |
1005 | elfcpp::Shdr<size, big_endian>& shdr) | |
1006 | { | |
1007 | unsigned int sh_type = shdr.get_sh_type(); | |
1008 | ||
aa06ae28 CC |
1009 | // We preserve the layout of PROGBITS, NOBITS, INIT_ARRAY, FINI_ARRAY, |
1010 | // PRE_INIT_ARRAY, and NOTE sections. | |
cdc29364 | 1011 | // All others will be created from scratch and reallocated. |
aa06ae28 | 1012 | if (!can_incremental_update(sh_type)) |
cdc29364 CC |
1013 | return NULL; |
1014 | ||
c1027032 CC |
1015 | // If we're generating a .gdb_index section, we need to regenerate |
1016 | // it from scratch. | |
1017 | if (parameters->options().gdb_index() | |
1018 | && sh_type == elfcpp::SHT_PROGBITS | |
1019 | && strcmp(name, ".gdb_index") == 0) | |
1020 | return NULL; | |
1021 | ||
cdc29364 CC |
1022 | typename elfcpp::Elf_types<size>::Elf_Addr sh_addr = shdr.get_sh_addr(); |
1023 | typename elfcpp::Elf_types<size>::Elf_Off sh_offset = shdr.get_sh_offset(); | |
1024 | typename elfcpp::Elf_types<size>::Elf_WXword sh_size = shdr.get_sh_size(); | |
1025 | typename elfcpp::Elf_types<size>::Elf_WXword sh_flags = shdr.get_sh_flags(); | |
1026 | typename elfcpp::Elf_types<size>::Elf_WXword sh_addralign = | |
1027 | shdr.get_sh_addralign(); | |
1028 | ||
1029 | // Make the output section. | |
1030 | Stringpool::Key name_key; | |
1031 | name = this->namepool_.add(name, true, &name_key); | |
1032 | Output_section* os = this->get_output_section(name, name_key, sh_type, | |
2e702c99 | 1033 | sh_flags, ORDER_INVALID, false); |
cdc29364 CC |
1034 | os->set_fixed_layout(sh_addr, sh_offset, sh_size, sh_addralign); |
1035 | if (sh_type != elfcpp::SHT_NOBITS) | |
1036 | this->free_list_.remove(sh_offset, sh_offset + sh_size); | |
1037 | return os; | |
1038 | } | |
1039 | ||
edcac0c1 ILT |
1040 | // Return the index by which an input section should be ordered. This |
1041 | // is used to sort some .text sections, for compatibility with GNU ld. | |
1042 | ||
1043 | int | |
1044 | Layout::special_ordering_of_input_section(const char* name) | |
1045 | { | |
1046 | // The GNU linker has some special handling for some sections that | |
1047 | // wind up in the .text section. Sections that start with these | |
1048 | // prefixes must appear first, and must appear in the order listed | |
1049 | // here. | |
1050 | static const char* const text_section_sort[] = | |
1051 | { | |
1052 | ".text.unlikely", | |
1053 | ".text.exit", | |
1054 | ".text.startup", | |
1055 | ".text.hot" | |
1056 | }; | |
1057 | ||
1058 | for (size_t i = 0; | |
1059 | i < sizeof(text_section_sort) / sizeof(text_section_sort[0]); | |
1060 | i++) | |
1061 | if (is_prefix_of(text_section_sort[i], name)) | |
1062 | return i; | |
1063 | ||
1064 | return -1; | |
1065 | } | |
1066 | ||
ead1e424 | 1067 | // Return the output section to use for input section SHNDX, with name |
730cdc88 ILT |
1068 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
1069 | // index of a relocation section which applies to this section, or 0 | |
1070 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
1071 | // relocation section if there is one. Set *OFF to the offset of this | |
1072 | // input section without the output section. Return NULL if the | |
1073 | // section should be discarded. Set *OFF to -1 if the section | |
1074 | // contents should not be written directly to the output file, but | |
1075 | // will instead receive special handling. | |
ead1e424 ILT |
1076 | |
1077 | template<int size, bool big_endian> | |
1078 | Output_section* | |
6fa2a40b | 1079 | Layout::layout(Sized_relobj_file<size, big_endian>* object, unsigned int shndx, |
730cdc88 ILT |
1080 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, |
1081 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 | 1082 | { |
ef9beddf ILT |
1083 | *off = 0; |
1084 | ||
ead1e424 ILT |
1085 | if (!this->include_section(object, name, shdr)) |
1086 | return NULL; | |
1087 | ||
2a0ff005 | 1088 | elfcpp::Elf_Word sh_type = shdr.get_sh_type(); |
2a0ff005 | 1089 | |
6a74a719 ILT |
1090 | // In a relocatable link a grouped section must not be combined with |
1091 | // any other sections. | |
5393d741 | 1092 | Output_section* os; |
8851ecca | 1093 | if (parameters->options().relocatable() |
6a74a719 ILT |
1094 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
1095 | { | |
1096 | name = this->namepool_.add(name, true, NULL); | |
22f0da72 ILT |
1097 | os = this->make_output_section(name, sh_type, shdr.get_sh_flags(), |
1098 | ORDER_INVALID, false); | |
6a74a719 ILT |
1099 | } |
1100 | else | |
1101 | { | |
16164a6b ST |
1102 | // Plugins can choose to place one or more subsets of sections in |
1103 | // unique segments and this is done by mapping these section subsets | |
1104 | // to unique output sections. Check if this section needs to be | |
1105 | // remapped to a unique output section. | |
1106 | Section_segment_map::iterator it | |
1107 | = this->section_segment_map_.find(Const_section_id(object, shndx)); | |
1108 | if (it == this->section_segment_map_.end()) | |
1109 | { | |
1110 | os = this->choose_output_section(object, name, sh_type, | |
1111 | shdr.get_sh_flags(), true, | |
1112 | ORDER_INVALID, false); | |
1113 | } | |
1114 | else | |
1115 | { | |
1116 | // We know the name of the output section, directly call | |
1117 | // get_output_section here by-passing choose_output_section. | |
1118 | elfcpp::Elf_Xword flags | |
1119 | = this->get_output_section_flags(shdr.get_sh_flags()); | |
1120 | ||
1121 | const char* os_name = it->second->name; | |
1122 | Stringpool::Key name_key; | |
1123 | os_name = this->namepool_.add(os_name, true, &name_key); | |
1124 | os = this->get_output_section(os_name, name_key, sh_type, flags, | |
1125 | ORDER_INVALID, false); | |
1126 | if (!os->is_unique_segment()) | |
1127 | { | |
1128 | os->set_is_unique_segment(); | |
1129 | os->set_extra_segment_flags(it->second->flags); | |
1130 | os->set_segment_alignment(it->second->align); | |
1131 | } | |
1132 | } | |
6a74a719 ILT |
1133 | if (os == NULL) |
1134 | return NULL; | |
1135 | } | |
a2fb1b05 | 1136 | |
2fd32231 | 1137 | // By default the GNU linker sorts input sections whose names match |
487b39df ILT |
1138 | // .ctors.*, .dtors.*, .init_array.*, or .fini_array.*. The |
1139 | // sections are sorted by name. This is used to implement | |
1140 | // constructor priority ordering. We are compatible. When we put | |
1141 | // .ctor sections in .init_array and .dtor sections in .fini_array, | |
1142 | // we must also sort plain .ctor and .dtor sections. | |
2fd32231 | 1143 | if (!this->script_options_->saw_sections_clause() |
5393d741 | 1144 | && !parameters->options().relocatable() |
2fd32231 ILT |
1145 | && (is_prefix_of(".ctors.", name) |
1146 | || is_prefix_of(".dtors.", name) | |
1147 | || is_prefix_of(".init_array.", name) | |
5393d741 ILT |
1148 | || is_prefix_of(".fini_array.", name) |
1149 | || (parameters->options().ctors_in_init_array() | |
1150 | && (strcmp(name, ".ctors") == 0 | |
1151 | || strcmp(name, ".dtors") == 0)))) | |
2fd32231 ILT |
1152 | os->set_must_sort_attached_input_sections(); |
1153 | ||
edcac0c1 ILT |
1154 | // By default the GNU linker sorts some special text sections ahead |
1155 | // of others. We are compatible. | |
c6ac678d ST |
1156 | if (parameters->options().text_reorder() |
1157 | && !this->script_options_->saw_sections_clause() | |
7c381248 | 1158 | && !this->is_section_ordering_specified() |
edcac0c1 ILT |
1159 | && !parameters->options().relocatable() |
1160 | && Layout::special_ordering_of_input_section(name) >= 0) | |
1161 | os->set_must_sort_attached_input_sections(); | |
1162 | ||
487b39df ILT |
1163 | // If this is a .ctors or .ctors.* section being mapped to a |
1164 | // .init_array section, or a .dtors or .dtors.* section being mapped | |
1165 | // to a .fini_array section, we will need to reverse the words if | |
1166 | // there is more than one. Record this section for later. See | |
1167 | // ctors_sections_in_init_array above. | |
1168 | if (!this->script_options_->saw_sections_clause() | |
1169 | && !parameters->options().relocatable() | |
1170 | && shdr.get_sh_size() > size / 8 | |
1171 | && (((strcmp(name, ".ctors") == 0 | |
1172 | || is_prefix_of(".ctors.", name)) | |
1173 | && strcmp(os->name(), ".init_array") == 0) | |
1174 | || ((strcmp(name, ".dtors") == 0 | |
1175 | || is_prefix_of(".dtors.", name)) | |
1176 | && strcmp(os->name(), ".fini_array") == 0))) | |
1177 | ctors_sections_in_init_array.insert(Section_id(object, shndx)); | |
1178 | ||
a2fb1b05 ILT |
1179 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
1180 | ||
5b7b7d6e ILT |
1181 | elfcpp::Elf_Xword orig_flags = os->flags(); |
1182 | ||
6e9ba2ca | 1183 | *off = os->add_input_section(this, object, shndx, name, shdr, reloc_shndx, |
a445fddf | 1184 | this->script_options_->saw_sections_clause()); |
5b7b7d6e ILT |
1185 | |
1186 | // If the flags changed, we may have to change the order. | |
1187 | if ((orig_flags & elfcpp::SHF_ALLOC) != 0) | |
1188 | { | |
1189 | orig_flags &= (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
1190 | elfcpp::Elf_Xword new_flags = | |
1191 | os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
1192 | if (orig_flags != new_flags) | |
1193 | os->set_order(this->default_section_order(os, false)); | |
1194 | } | |
1195 | ||
d7bb5745 | 1196 | this->have_added_input_section_ = true; |
a2fb1b05 ILT |
1197 | |
1198 | return os; | |
1199 | } | |
1200 | ||
16164a6b ST |
1201 | // Maps section SECN to SEGMENT s. |
1202 | void | |
1203 | Layout::insert_section_segment_map(Const_section_id secn, | |
1204 | Unique_segment_info *s) | |
1205 | { | |
1206 | gold_assert(this->unique_segment_for_sections_specified_); | |
1207 | this->section_segment_map_[secn] = s; | |
1208 | } | |
1209 | ||
6a74a719 ILT |
1210 | // Handle a relocation section when doing a relocatable link. |
1211 | ||
1212 | template<int size, bool big_endian> | |
1213 | Output_section* | |
6fa2a40b | 1214 | Layout::layout_reloc(Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
1215 | unsigned int, |
1216 | const elfcpp::Shdr<size, big_endian>& shdr, | |
1217 | Output_section* data_section, | |
1218 | Relocatable_relocs* rr) | |
1219 | { | |
8851ecca ILT |
1220 | gold_assert(parameters->options().relocatable() |
1221 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
1222 | |
1223 | int sh_type = shdr.get_sh_type(); | |
1224 | ||
1225 | std::string name; | |
1226 | if (sh_type == elfcpp::SHT_REL) | |
1227 | name = ".rel"; | |
1228 | else if (sh_type == elfcpp::SHT_RELA) | |
1229 | name = ".rela"; | |
1230 | else | |
1231 | gold_unreachable(); | |
1232 | name += data_section->name(); | |
1233 | ||
bd288ea2 ILT |
1234 | // In a relocatable link relocs for a grouped section must not be |
1235 | // combined with other reloc sections. | |
1236 | Output_section* os; | |
1237 | if (!parameters->options().relocatable() | |
1238 | || (data_section->flags() & elfcpp::SHF_GROUP) == 0) | |
1239 | os = this->choose_output_section(object, name.c_str(), sh_type, | |
22f0da72 ILT |
1240 | shdr.get_sh_flags(), false, |
1241 | ORDER_INVALID, false); | |
bd288ea2 ILT |
1242 | else |
1243 | { | |
1244 | const char* n = this->namepool_.add(name.c_str(), true, NULL); | |
1245 | os = this->make_output_section(n, sh_type, shdr.get_sh_flags(), | |
22f0da72 | 1246 | ORDER_INVALID, false); |
bd288ea2 | 1247 | } |
6a74a719 ILT |
1248 | |
1249 | os->set_should_link_to_symtab(); | |
1250 | os->set_info_section(data_section); | |
1251 | ||
1252 | Output_section_data* posd; | |
1253 | if (sh_type == elfcpp::SHT_REL) | |
1254 | { | |
1255 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); | |
1256 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, | |
1257 | size, | |
1258 | big_endian>(rr); | |
1259 | } | |
1260 | else if (sh_type == elfcpp::SHT_RELA) | |
1261 | { | |
1262 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); | |
1263 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, | |
1264 | size, | |
1265 | big_endian>(rr); | |
1266 | } | |
1267 | else | |
1268 | gold_unreachable(); | |
1269 | ||
1270 | os->add_output_section_data(posd); | |
1271 | rr->set_output_data(posd); | |
1272 | ||
1273 | return os; | |
1274 | } | |
1275 | ||
1276 | // Handle a group section when doing a relocatable link. | |
1277 | ||
1278 | template<int size, bool big_endian> | |
1279 | void | |
1280 | Layout::layout_group(Symbol_table* symtab, | |
6fa2a40b | 1281 | Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
1282 | unsigned int, |
1283 | const char* group_section_name, | |
1284 | const char* signature, | |
1285 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
1286 | elfcpp::Elf_Word flags, |
1287 | std::vector<unsigned int>* shndxes) | |
6a74a719 | 1288 | { |
8851ecca | 1289 | gold_assert(parameters->options().relocatable()); |
6a74a719 ILT |
1290 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
1291 | group_section_name = this->namepool_.add(group_section_name, true, NULL); | |
1292 | Output_section* os = this->make_output_section(group_section_name, | |
1293 | elfcpp::SHT_GROUP, | |
f5c870d2 | 1294 | shdr.get_sh_flags(), |
22f0da72 | 1295 | ORDER_INVALID, false); |
6a74a719 ILT |
1296 | |
1297 | // We need to find a symbol with the signature in the symbol table. | |
755ab8af | 1298 | // If we don't find one now, we need to look again later. |
6a74a719 | 1299 | Symbol* sym = symtab->lookup(signature, NULL); |
755ab8af ILT |
1300 | if (sym != NULL) |
1301 | os->set_info_symndx(sym); | |
1302 | else | |
1303 | { | |
e55bde5e ILT |
1304 | // Reserve some space to minimize reallocations. |
1305 | if (this->group_signatures_.empty()) | |
1306 | this->group_signatures_.reserve(this->number_of_input_files_ * 16); | |
1307 | ||
755ab8af ILT |
1308 | // We will wind up using a symbol whose name is the signature. |
1309 | // So just put the signature in the symbol name pool to save it. | |
1310 | signature = symtab->canonicalize_name(signature); | |
1311 | this->group_signatures_.push_back(Group_signature(os, signature)); | |
1312 | } | |
6a74a719 ILT |
1313 | |
1314 | os->set_should_link_to_symtab(); | |
6a74a719 ILT |
1315 | os->set_entsize(4); |
1316 | ||
1317 | section_size_type entry_count = | |
1318 | convert_to_section_size_type(shdr.get_sh_size() / 4); | |
1319 | Output_section_data* posd = | |
8825ac63 ILT |
1320 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
1321 | shndxes); | |
6a74a719 ILT |
1322 | os->add_output_section_data(posd); |
1323 | } | |
1324 | ||
730cdc88 ILT |
1325 | // Special GNU handling of sections name .eh_frame. They will |
1326 | // normally hold exception frame data as defined by the C++ ABI | |
1327 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
1328 | |
1329 | template<int size, bool big_endian> | |
730cdc88 | 1330 | Output_section* |
6fa2a40b | 1331 | Layout::layout_eh_frame(Sized_relobj_file<size, big_endian>* object, |
730cdc88 ILT |
1332 | const unsigned char* symbols, |
1333 | off_t symbols_size, | |
1334 | const unsigned char* symbol_names, | |
1335 | off_t symbol_names_size, | |
3151305a | 1336 | unsigned int shndx, |
3151305a | 1337 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
1338 | unsigned int reloc_shndx, unsigned int reloc_type, |
1339 | off_t* off) | |
3151305a | 1340 | { |
4d5e4e62 ILT |
1341 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS |
1342 | || shdr.get_sh_type() == elfcpp::SHT_X86_64_UNWIND); | |
1650c4ff | 1343 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 | 1344 | |
07a60597 | 1345 | Output_section* os = this->make_eh_frame_section(object); |
a445fddf ILT |
1346 | if (os == NULL) |
1347 | return NULL; | |
730cdc88 | 1348 | |
3151305a ILT |
1349 | gold_assert(this->eh_frame_section_ == os); |
1350 | ||
911a5072 ILT |
1351 | elfcpp::Elf_Xword orig_flags = os->flags(); |
1352 | ||
cdc29364 CC |
1353 | if (!parameters->incremental() |
1354 | && this->eh_frame_data_->add_ehframe_input_section(object, | |
1355 | symbols, | |
1356 | symbols_size, | |
1357 | symbol_names, | |
1358 | symbol_names_size, | |
1359 | shndx, | |
1360 | reloc_shndx, | |
1361 | reloc_type)) | |
2c38906f | 1362 | { |
154e0e9a ILT |
1363 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
1364 | ||
3bb951e5 | 1365 | // A writable .eh_frame section is a RELRO section. |
911a5072 ILT |
1366 | if ((orig_flags & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR)) |
1367 | != (os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR))) | |
1368 | { | |
1369 | os->set_is_relro(); | |
1370 | os->set_order(ORDER_RELRO); | |
1371 | } | |
3bb951e5 | 1372 | |
2c38906f ILT |
1373 | // We found a .eh_frame section we are going to optimize, so now |
1374 | // we can add the set of optimized sections to the output | |
1375 | // section. We need to postpone adding this until we've found a | |
1376 | // section we can optimize so that the .eh_frame section in | |
1377 | // crtbegin.o winds up at the start of the output section. | |
1378 | if (!this->added_eh_frame_data_) | |
1379 | { | |
1380 | os->add_output_section_data(this->eh_frame_data_); | |
1381 | this->added_eh_frame_data_ = true; | |
1382 | } | |
1383 | *off = -1; | |
1384 | } | |
730cdc88 ILT |
1385 | else |
1386 | { | |
1387 | // We couldn't handle this .eh_frame section for some reason. | |
1388 | // Add it as a normal section. | |
a445fddf | 1389 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); |
07a60597 ILT |
1390 | *off = os->add_input_section(this, object, shndx, ".eh_frame", shdr, |
1391 | reloc_shndx, saw_sections_clause); | |
d7bb5745 | 1392 | this->have_added_input_section_ = true; |
911a5072 ILT |
1393 | |
1394 | if ((orig_flags & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR)) | |
1395 | != (os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR))) | |
1396 | os->set_order(this->default_section_order(os, false)); | |
730cdc88 ILT |
1397 | } |
1398 | ||
1399 | return os; | |
3151305a ILT |
1400 | } |
1401 | ||
07a60597 ILT |
1402 | // Create and return the magic .eh_frame section. Create |
1403 | // .eh_frame_hdr also if appropriate. OBJECT is the object with the | |
1404 | // input .eh_frame section; it may be NULL. | |
1405 | ||
1406 | Output_section* | |
1407 | Layout::make_eh_frame_section(const Relobj* object) | |
1408 | { | |
1409 | // FIXME: On x86_64, this could use SHT_X86_64_UNWIND rather than | |
1410 | // SHT_PROGBITS. | |
1411 | Output_section* os = this->choose_output_section(object, ".eh_frame", | |
1412 | elfcpp::SHT_PROGBITS, | |
1413 | elfcpp::SHF_ALLOC, false, | |
1414 | ORDER_EHFRAME, false); | |
1415 | if (os == NULL) | |
1416 | return NULL; | |
1417 | ||
1418 | if (this->eh_frame_section_ == NULL) | |
1419 | { | |
1420 | this->eh_frame_section_ = os; | |
1421 | this->eh_frame_data_ = new Eh_frame(); | |
1422 | ||
1423 | // For incremental linking, we do not optimize .eh_frame sections | |
1424 | // or create a .eh_frame_hdr section. | |
1425 | if (parameters->options().eh_frame_hdr() && !parameters->incremental()) | |
1426 | { | |
1427 | Output_section* hdr_os = | |
1428 | this->choose_output_section(NULL, ".eh_frame_hdr", | |
1429 | elfcpp::SHT_PROGBITS, | |
1430 | elfcpp::SHF_ALLOC, false, | |
1431 | ORDER_EHFRAME, false); | |
1432 | ||
1433 | if (hdr_os != NULL) | |
1434 | { | |
1435 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, | |
1436 | this->eh_frame_data_); | |
1437 | hdr_os->add_output_section_data(hdr_posd); | |
1438 | ||
1439 | hdr_os->set_after_input_sections(); | |
1440 | ||
1441 | if (!this->script_options_->saw_phdrs_clause()) | |
1442 | { | |
1443 | Output_segment* hdr_oseg; | |
1444 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, | |
1445 | elfcpp::PF_R); | |
1446 | hdr_oseg->add_output_section_to_nonload(hdr_os, | |
1447 | elfcpp::PF_R); | |
1448 | } | |
1449 | ||
1450 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); | |
1451 | } | |
1452 | } | |
1453 | } | |
1454 | ||
1455 | return os; | |
1456 | } | |
1457 | ||
1458 | // Add an exception frame for a PLT. This is called from target code. | |
1459 | ||
1460 | void | |
1461 | Layout::add_eh_frame_for_plt(Output_data* plt, const unsigned char* cie_data, | |
1462 | size_t cie_length, const unsigned char* fde_data, | |
1463 | size_t fde_length) | |
1464 | { | |
1465 | if (parameters->incremental()) | |
1466 | { | |
1467 | // FIXME: Maybe this could work some day.... | |
1468 | return; | |
1469 | } | |
1470 | Output_section* os = this->make_eh_frame_section(NULL); | |
1471 | if (os == NULL) | |
1472 | return; | |
1473 | this->eh_frame_data_->add_ehframe_for_plt(plt, cie_data, cie_length, | |
1474 | fde_data, fde_length); | |
1475 | if (!this->added_eh_frame_data_) | |
1476 | { | |
1477 | os->add_output_section_data(this->eh_frame_data_); | |
1478 | this->added_eh_frame_data_ = true; | |
1479 | } | |
1480 | } | |
1481 | ||
c1027032 CC |
1482 | // Scan a .debug_info or .debug_types section, and add summary |
1483 | // information to the .gdb_index section. | |
1484 | ||
1485 | template<int size, bool big_endian> | |
1486 | void | |
1487 | Layout::add_to_gdb_index(bool is_type_unit, | |
1488 | Sized_relobj<size, big_endian>* object, | |
1489 | const unsigned char* symbols, | |
1490 | off_t symbols_size, | |
1491 | unsigned int shndx, | |
1492 | unsigned int reloc_shndx, | |
1493 | unsigned int reloc_type) | |
1494 | { | |
1495 | if (this->gdb_index_data_ == NULL) | |
1496 | { | |
1497 | Output_section* os = this->choose_output_section(NULL, ".gdb_index", | |
1498 | elfcpp::SHT_PROGBITS, 0, | |
1499 | false, ORDER_INVALID, | |
1500 | false); | |
1501 | if (os == NULL) | |
2e702c99 | 1502 | return; |
c1027032 CC |
1503 | |
1504 | this->gdb_index_data_ = new Gdb_index(os); | |
1505 | os->add_output_section_data(this->gdb_index_data_); | |
1506 | os->set_after_input_sections(); | |
1507 | } | |
1508 | ||
1509 | this->gdb_index_data_->scan_debug_info(is_type_unit, object, symbols, | |
1510 | symbols_size, shndx, reloc_shndx, | |
1511 | reloc_type); | |
1512 | } | |
1513 | ||
9f1d377b ILT |
1514 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
1515 | // the output section. | |
ead1e424 | 1516 | |
9f1d377b | 1517 | Output_section* |
ead1e424 ILT |
1518 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
1519 | elfcpp::Elf_Xword flags, | |
f5c870d2 | 1520 | Output_section_data* posd, |
22f0da72 | 1521 | Output_section_order order, bool is_relro) |
ead1e424 | 1522 | { |
a445fddf | 1523 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
22f0da72 | 1524 | false, order, is_relro); |
a445fddf ILT |
1525 | if (os != NULL) |
1526 | os->add_output_section_data(posd); | |
9f1d377b | 1527 | return os; |
ead1e424 ILT |
1528 | } |
1529 | ||
a2fb1b05 ILT |
1530 | // Map section flags to segment flags. |
1531 | ||
1532 | elfcpp::Elf_Word | |
1533 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
1534 | { | |
1535 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
1536 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
1537 | ret |= elfcpp::PF_W; | |
1538 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
1539 | ret |= elfcpp::PF_X; | |
1540 | return ret; | |
1541 | } | |
1542 | ||
1543 | // Make a new Output_section, and attach it to segments as | |
22f0da72 ILT |
1544 | // appropriate. ORDER is the order in which this section should |
1545 | // appear in the output segment. IS_RELRO is true if this is a relro | |
1546 | // (read-only after relocations) section. | |
a2fb1b05 ILT |
1547 | |
1548 | Output_section* | |
1549 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
22f0da72 ILT |
1550 | elfcpp::Elf_Xword flags, |
1551 | Output_section_order order, bool is_relro) | |
a2fb1b05 | 1552 | { |
96803768 ILT |
1553 | Output_section* os; |
1554 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 1555 | && strcmp(parameters->options().compress_debug_sections(), "none") != 0 |
96803768 | 1556 | && is_compressible_debug_section(name)) |
e55bde5e ILT |
1557 | os = new Output_compressed_section(¶meters->options(), name, type, |
1558 | flags); | |
62b01cb5 | 1559 | else if ((flags & elfcpp::SHF_ALLOC) == 0 |
2e702c99 RM |
1560 | && parameters->options().strip_debug_non_line() |
1561 | && strcmp(".debug_abbrev", name) == 0) | |
62b01cb5 ILT |
1562 | { |
1563 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( | |
2e702c99 | 1564 | name, type, flags); |
62b01cb5 | 1565 | if (this->debug_info_) |
2e702c99 | 1566 | this->debug_info_->set_abbreviations(this->debug_abbrev_); |
62b01cb5 ILT |
1567 | } |
1568 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
2e702c99 RM |
1569 | && parameters->options().strip_debug_non_line() |
1570 | && strcmp(".debug_info", name) == 0) | |
62b01cb5 ILT |
1571 | { |
1572 | os = this->debug_info_ = new Output_reduced_debug_info_section( | |
2e702c99 | 1573 | name, type, flags); |
62b01cb5 | 1574 | if (this->debug_abbrev_) |
2e702c99 | 1575 | this->debug_info_->set_abbreviations(this->debug_abbrev_); |
62b01cb5 | 1576 | } |
09ec0418 | 1577 | else |
c0a62865 | 1578 | { |
5393d741 ILT |
1579 | // Sometimes .init_array*, .preinit_array* and .fini_array* do |
1580 | // not have correct section types. Force them here. | |
1581 | if (type == elfcpp::SHT_PROGBITS) | |
1582 | { | |
1583 | if (is_prefix_of(".init_array", name)) | |
1584 | type = elfcpp::SHT_INIT_ARRAY; | |
1585 | else if (is_prefix_of(".preinit_array", name)) | |
1586 | type = elfcpp::SHT_PREINIT_ARRAY; | |
1587 | else if (is_prefix_of(".fini_array", name)) | |
1588 | type = elfcpp::SHT_FINI_ARRAY; | |
1589 | } | |
1590 | ||
c0a62865 DK |
1591 | // FIXME: const_cast is ugly. |
1592 | Target* target = const_cast<Target*>(¶meters->target()); | |
1593 | os = target->make_output_section(name, type, flags); | |
1594 | } | |
96803768 | 1595 | |
22f0da72 ILT |
1596 | // With -z relro, we have to recognize the special sections by name. |
1597 | // There is no other way. | |
1598 | bool is_relro_local = false; | |
1599 | if (!this->script_options_->saw_sections_clause() | |
1600 | && parameters->options().relro() | |
22f0da72 ILT |
1601 | && (flags & elfcpp::SHF_ALLOC) != 0 |
1602 | && (flags & elfcpp::SHF_WRITE) != 0) | |
1603 | { | |
14dc9ef7 | 1604 | if (type == elfcpp::SHT_PROGBITS) |
22f0da72 | 1605 | { |
1007b503 CC |
1606 | if ((flags & elfcpp::SHF_TLS) != 0) |
1607 | is_relro = true; | |
1608 | else if (strcmp(name, ".data.rel.ro") == 0) | |
14dc9ef7 ILT |
1609 | is_relro = true; |
1610 | else if (strcmp(name, ".data.rel.ro.local") == 0) | |
1611 | { | |
1612 | is_relro = true; | |
1613 | is_relro_local = true; | |
1614 | } | |
1615 | else if (strcmp(name, ".ctors") == 0 | |
1616 | || strcmp(name, ".dtors") == 0 | |
1617 | || strcmp(name, ".jcr") == 0) | |
1618 | is_relro = true; | |
22f0da72 ILT |
1619 | } |
1620 | else if (type == elfcpp::SHT_INIT_ARRAY | |
1621 | || type == elfcpp::SHT_FINI_ARRAY | |
1622 | || type == elfcpp::SHT_PREINIT_ARRAY) | |
1623 | is_relro = true; | |
22f0da72 ILT |
1624 | } |
1625 | ||
1a2dff53 ILT |
1626 | if (is_relro) |
1627 | os->set_is_relro(); | |
22f0da72 ILT |
1628 | |
1629 | if (order == ORDER_INVALID && (flags & elfcpp::SHF_ALLOC) != 0) | |
1630 | order = this->default_section_order(os, is_relro_local); | |
1631 | ||
1632 | os->set_order(order); | |
f5c870d2 | 1633 | |
8a5e3e08 ILT |
1634 | parameters->target().new_output_section(os); |
1635 | ||
a3ad94ed | 1636 | this->section_list_.push_back(os); |
a2fb1b05 | 1637 | |
2fd32231 ILT |
1638 | // The GNU linker by default sorts some sections by priority, so we |
1639 | // do the same. We need to know that this might happen before we | |
1640 | // attach any input sections. | |
1641 | if (!this->script_options_->saw_sections_clause() | |
5393d741 ILT |
1642 | && !parameters->options().relocatable() |
1643 | && (strcmp(name, ".init_array") == 0 | |
1644 | || strcmp(name, ".fini_array") == 0 | |
1645 | || (!parameters->options().ctors_in_init_array() | |
1646 | && (strcmp(name, ".ctors") == 0 | |
1647 | || strcmp(name, ".dtors") == 0)))) | |
2fd32231 ILT |
1648 | os->set_may_sort_attached_input_sections(); |
1649 | ||
edcac0c1 ILT |
1650 | // The GNU linker by default sorts .text.{unlikely,exit,startup,hot} |
1651 | // sections before other .text sections. We are compatible. We | |
1652 | // need to know that this might happen before we attach any input | |
1653 | // sections. | |
c6ac678d ST |
1654 | if (parameters->options().text_reorder() |
1655 | && !this->script_options_->saw_sections_clause() | |
7c381248 | 1656 | && !this->is_section_ordering_specified() |
edcac0c1 ILT |
1657 | && !parameters->options().relocatable() |
1658 | && strcmp(name, ".text") == 0) | |
1659 | os->set_may_sort_attached_input_sections(); | |
1660 | ||
1518dc8f ILT |
1661 | // Check for .stab*str sections, as .stab* sections need to link to |
1662 | // them. | |
1663 | if (type == elfcpp::SHT_STRTAB | |
1664 | && !this->have_stabstr_section_ | |
1665 | && strncmp(name, ".stab", 5) == 0 | |
1666 | && strcmp(name + strlen(name) - 3, "str") == 0) | |
1667 | this->have_stabstr_section_ = true; | |
1668 | ||
9fbd3822 CC |
1669 | // During a full incremental link, we add patch space to most |
1670 | // PROGBITS and NOBITS sections. Flag those that may be | |
1671 | // arbitrarily padded. | |
1672 | if ((type == elfcpp::SHT_PROGBITS || type == elfcpp::SHT_NOBITS) | |
1673 | && order != ORDER_INTERP | |
1674 | && order != ORDER_INIT | |
1675 | && order != ORDER_PLT | |
1676 | && order != ORDER_FINI | |
1677 | && order != ORDER_RELRO_LAST | |
1678 | && order != ORDER_NON_RELRO_FIRST | |
aa06ae28 | 1679 | && strcmp(name, ".eh_frame") != 0 |
9fbd3822 CC |
1680 | && strcmp(name, ".ctors") != 0 |
1681 | && strcmp(name, ".dtors") != 0 | |
1682 | && strcmp(name, ".jcr") != 0) | |
8ea8cd50 CC |
1683 | { |
1684 | os->set_is_patch_space_allowed(); | |
1685 | ||
1686 | // Certain sections require "holes" to be filled with | |
1687 | // specific fill patterns. These fill patterns may have | |
1688 | // a minimum size, so we must prevent allocations from the | |
1689 | // free list that leave a hole smaller than the minimum. | |
1690 | if (strcmp(name, ".debug_info") == 0) | |
2e702c99 | 1691 | os->set_free_space_fill(new Output_fill_debug_info(false)); |
8ea8cd50 | 1692 | else if (strcmp(name, ".debug_types") == 0) |
2e702c99 | 1693 | os->set_free_space_fill(new Output_fill_debug_info(true)); |
8ea8cd50 | 1694 | else if (strcmp(name, ".debug_line") == 0) |
2e702c99 | 1695 | os->set_free_space_fill(new Output_fill_debug_line()); |
8ea8cd50 | 1696 | } |
9fbd3822 | 1697 | |
154e0e9a ILT |
1698 | // If we have already attached the sections to segments, then we |
1699 | // need to attach this one now. This happens for sections created | |
1700 | // directly by the linker. | |
1701 | if (this->sections_are_attached_) | |
2e702c99 | 1702 | this->attach_section_to_segment(¶meters->target(), os); |
154e0e9a | 1703 | |
4e2b1697 ILT |
1704 | return os; |
1705 | } | |
a445fddf | 1706 | |
22f0da72 ILT |
1707 | // Return the default order in which a section should be placed in an |
1708 | // output segment. This function captures a lot of the ideas in | |
1709 | // ld/scripttempl/elf.sc in the GNU linker. Note that the order of a | |
1710 | // linker created section is normally set when the section is created; | |
1711 | // this function is used for input sections. | |
1712 | ||
1713 | Output_section_order | |
1714 | Layout::default_section_order(Output_section* os, bool is_relro_local) | |
1715 | { | |
1716 | gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0); | |
1717 | bool is_write = (os->flags() & elfcpp::SHF_WRITE) != 0; | |
1718 | bool is_execinstr = (os->flags() & elfcpp::SHF_EXECINSTR) != 0; | |
1719 | bool is_bss = false; | |
1720 | ||
1721 | switch (os->type()) | |
1722 | { | |
1723 | default: | |
1724 | case elfcpp::SHT_PROGBITS: | |
1725 | break; | |
1726 | case elfcpp::SHT_NOBITS: | |
1727 | is_bss = true; | |
1728 | break; | |
1729 | case elfcpp::SHT_RELA: | |
1730 | case elfcpp::SHT_REL: | |
1731 | if (!is_write) | |
1732 | return ORDER_DYNAMIC_RELOCS; | |
1733 | break; | |
1734 | case elfcpp::SHT_HASH: | |
1735 | case elfcpp::SHT_DYNAMIC: | |
1736 | case elfcpp::SHT_SHLIB: | |
1737 | case elfcpp::SHT_DYNSYM: | |
1738 | case elfcpp::SHT_GNU_HASH: | |
1739 | case elfcpp::SHT_GNU_verdef: | |
1740 | case elfcpp::SHT_GNU_verneed: | |
1741 | case elfcpp::SHT_GNU_versym: | |
1742 | if (!is_write) | |
1743 | return ORDER_DYNAMIC_LINKER; | |
1744 | break; | |
1745 | case elfcpp::SHT_NOTE: | |
1746 | return is_write ? ORDER_RW_NOTE : ORDER_RO_NOTE; | |
1747 | } | |
1748 | ||
1749 | if ((os->flags() & elfcpp::SHF_TLS) != 0) | |
1750 | return is_bss ? ORDER_TLS_BSS : ORDER_TLS_DATA; | |
1751 | ||
1752 | if (!is_bss && !is_write) | |
1753 | { | |
1754 | if (is_execinstr) | |
1755 | { | |
1756 | if (strcmp(os->name(), ".init") == 0) | |
1757 | return ORDER_INIT; | |
1758 | else if (strcmp(os->name(), ".fini") == 0) | |
1759 | return ORDER_FINI; | |
1760 | } | |
1761 | return is_execinstr ? ORDER_TEXT : ORDER_READONLY; | |
1762 | } | |
1763 | ||
1764 | if (os->is_relro()) | |
1765 | return is_relro_local ? ORDER_RELRO_LOCAL : ORDER_RELRO; | |
1766 | ||
1767 | if (os->is_small_section()) | |
1768 | return is_bss ? ORDER_SMALL_BSS : ORDER_SMALL_DATA; | |
1769 | if (os->is_large_section()) | |
1770 | return is_bss ? ORDER_LARGE_BSS : ORDER_LARGE_DATA; | |
1771 | ||
1772 | return is_bss ? ORDER_BSS : ORDER_DATA; | |
1773 | } | |
1774 | ||
154e0e9a ILT |
1775 | // Attach output sections to segments. This is called after we have |
1776 | // seen all the input sections. | |
1777 | ||
1778 | void | |
2e702c99 | 1779 | Layout::attach_sections_to_segments(const Target* target) |
154e0e9a ILT |
1780 | { |
1781 | for (Section_list::iterator p = this->section_list_.begin(); | |
1782 | p != this->section_list_.end(); | |
1783 | ++p) | |
2e702c99 | 1784 | this->attach_section_to_segment(target, *p); |
154e0e9a ILT |
1785 | |
1786 | this->sections_are_attached_ = true; | |
1787 | } | |
1788 | ||
1789 | // Attach an output section to a segment. | |
1790 | ||
1791 | void | |
2e702c99 | 1792 | Layout::attach_section_to_segment(const Target* target, Output_section* os) |
154e0e9a ILT |
1793 | { |
1794 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
1795 | this->unattached_section_list_.push_back(os); | |
1796 | else | |
2e702c99 | 1797 | this->attach_allocated_section_to_segment(target, os); |
154e0e9a ILT |
1798 | } |
1799 | ||
4e2b1697 | 1800 | // Attach an allocated output section to a segment. |
1c4f3631 | 1801 | |
4e2b1697 | 1802 | void |
2e702c99 RM |
1803 | Layout::attach_allocated_section_to_segment(const Target* target, |
1804 | Output_section* os) | |
4e2b1697 | 1805 | { |
154e0e9a | 1806 | elfcpp::Elf_Xword flags = os->flags(); |
4e2b1697 | 1807 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
a2fb1b05 | 1808 | |
4e2b1697 ILT |
1809 | if (parameters->options().relocatable()) |
1810 | return; | |
a2fb1b05 | 1811 | |
4e2b1697 ILT |
1812 | // If we have a SECTIONS clause, we can't handle the attachment to |
1813 | // segments until after we've seen all the sections. | |
1814 | if (this->script_options_->saw_sections_clause()) | |
1815 | return; | |
a2fb1b05 | 1816 | |
4e2b1697 | 1817 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
756ac4a8 | 1818 | |
4e2b1697 | 1819 | // This output section goes into a PT_LOAD segment. |
a2fb1b05 | 1820 | |
4e2b1697 | 1821 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
a2fb1b05 | 1822 | |
16164a6b ST |
1823 | // If this output section's segment has extra flags that need to be set, |
1824 | // coming from a linker plugin, do that. | |
1825 | seg_flags |= os->extra_segment_flags(); | |
1826 | ||
a192ba05 ILT |
1827 | // Check for --section-start. |
1828 | uint64_t addr; | |
1829 | bool is_address_set = parameters->options().section_start(os->name(), &addr); | |
f5c870d2 | 1830 | |
4e2b1697 | 1831 | // In general the only thing we really care about for PT_LOAD |
0f72bf6f RÁE |
1832 | // segments is whether or not they are writable or executable, |
1833 | // so that is how we search for them. | |
1834 | // Large data sections also go into their own PT_LOAD segment. | |
1835 | // People who need segments sorted on some other basis will | |
1836 | // have to use a linker script. | |
a2fb1b05 | 1837 | |
4e2b1697 | 1838 | Segment_list::const_iterator p; |
16164a6b | 1839 | if (!os->is_unique_segment()) |
4e2b1697 | 1840 | { |
16164a6b ST |
1841 | for (p = this->segment_list_.begin(); |
1842 | p != this->segment_list_.end(); | |
1843 | ++p) | |
a192ba05 | 1844 | { |
16164a6b ST |
1845 | if ((*p)->type() != elfcpp::PT_LOAD) |
1846 | continue; | |
1847 | if ((*p)->is_unique_segment()) | |
1848 | continue; | |
1849 | if (!parameters->options().omagic() | |
1850 | && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W)) | |
1851 | continue; | |
1852 | if ((target->isolate_execinstr() || parameters->options().rosegment()) | |
1853 | && ((*p)->flags() & elfcpp::PF_X) != (seg_flags & elfcpp::PF_X)) | |
1854 | continue; | |
1855 | // If -Tbss was specified, we need to separate the data and BSS | |
1856 | // segments. | |
1857 | if (parameters->options().user_set_Tbss()) | |
1858 | { | |
1859 | if ((os->type() == elfcpp::SHT_NOBITS) | |
1860 | == (*p)->has_any_data_sections()) | |
1861 | continue; | |
1862 | } | |
1863 | if (os->is_large_data_section() && !(*p)->is_large_data_segment()) | |
1864 | continue; | |
1865 | ||
1866 | if (is_address_set) | |
1867 | { | |
1868 | if ((*p)->are_addresses_set()) | |
1869 | continue; | |
1870 | ||
1871 | (*p)->add_initial_output_data(os); | |
1872 | (*p)->update_flags_for_output_section(seg_flags); | |
1873 | (*p)->set_addresses(addr, addr); | |
1874 | break; | |
1875 | } | |
1876 | ||
1877 | (*p)->add_output_section_to_load(this, os, seg_flags); | |
1878 | break; | |
1879 | } | |
1880 | } | |
1881 | ||
1882 | if (p == this->segment_list_.end() | |
1883 | || os->is_unique_segment()) | |
4e2b1697 ILT |
1884 | { |
1885 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, | |
2e702c99 | 1886 | seg_flags); |
8a5e3e08 ILT |
1887 | if (os->is_large_data_section()) |
1888 | oseg->set_is_large_data_segment(); | |
22f0da72 | 1889 | oseg->add_output_section_to_load(this, os, seg_flags); |
a192ba05 ILT |
1890 | if (is_address_set) |
1891 | oseg->set_addresses(addr, addr); | |
16164a6b ST |
1892 | // Check if segment should be marked unique. For segments marked |
1893 | // unique by linker plugins, set the new alignment if specified. | |
1894 | if (os->is_unique_segment()) | |
1895 | { | |
1896 | oseg->set_is_unique_segment(); | |
1897 | if (os->segment_alignment() != 0) | |
1898 | oseg->set_minimum_p_align(os->segment_alignment()); | |
1899 | } | |
a2fb1b05 ILT |
1900 | } |
1901 | ||
4e2b1697 ILT |
1902 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
1903 | // segment. | |
1904 | if (os->type() == elfcpp::SHT_NOTE) | |
1905 | { | |
1906 | // See if we already have an equivalent PT_NOTE segment. | |
1907 | for (p = this->segment_list_.begin(); | |
2e702c99 RM |
1908 | p != segment_list_.end(); |
1909 | ++p) | |
1910 | { | |
1911 | if ((*p)->type() == elfcpp::PT_NOTE | |
1912 | && (((*p)->flags() & elfcpp::PF_W) | |
1913 | == (seg_flags & elfcpp::PF_W))) | |
1914 | { | |
1915 | (*p)->add_output_section_to_nonload(os, seg_flags); | |
1916 | break; | |
1917 | } | |
1918 | } | |
4e2b1697 ILT |
1919 | |
1920 | if (p == this->segment_list_.end()) | |
2e702c99 RM |
1921 | { |
1922 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, | |
1923 | seg_flags); | |
1924 | oseg->add_output_section_to_nonload(os, seg_flags); | |
1925 | } | |
4e2b1697 ILT |
1926 | } |
1927 | ||
1928 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
1929 | // segment. There can only be one such segment. | |
1930 | if ((flags & elfcpp::SHF_TLS) != 0) | |
1931 | { | |
1932 | if (this->tls_segment_ == NULL) | |
2d924fd9 | 1933 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
22f0da72 | 1934 | this->tls_segment_->add_output_section_to_nonload(os, seg_flags); |
4e2b1697 | 1935 | } |
9f1d377b ILT |
1936 | |
1937 | // If -z relro is in effect, and we see a relro section, we create a | |
1938 | // PT_GNU_RELRO segment. There can only be one such segment. | |
1939 | if (os->is_relro() && parameters->options().relro()) | |
1940 | { | |
1941 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); | |
1942 | if (this->relro_segment_ == NULL) | |
2d924fd9 | 1943 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
22f0da72 | 1944 | this->relro_segment_->add_output_section_to_nonload(os, seg_flags); |
9f1d377b | 1945 | } |
10b4f102 | 1946 | |
e1f74f98 ILT |
1947 | // If we see a section named .interp, put it into a PT_INTERP |
1948 | // segment. This seems broken to me, but this is what GNU ld does, | |
1949 | // and glibc expects it. | |
10b4f102 | 1950 | if (strcmp(os->name(), ".interp") == 0 |
e1f74f98 | 1951 | && !this->script_options_->saw_phdrs_clause()) |
10b4f102 ILT |
1952 | { |
1953 | if (this->interp_segment_ == NULL) | |
1954 | this->make_output_segment(elfcpp::PT_INTERP, seg_flags); | |
e1f74f98 ILT |
1955 | else |
1956 | gold_warning(_("multiple '.interp' sections in input files " | |
1957 | "may cause confusing PT_INTERP segment")); | |
10b4f102 ILT |
1958 | this->interp_segment_->add_output_section_to_nonload(os, seg_flags); |
1959 | } | |
a2fb1b05 ILT |
1960 | } |
1961 | ||
919ed24c ILT |
1962 | // Make an output section for a script. |
1963 | ||
1964 | Output_section* | |
1e5d2fb1 DK |
1965 | Layout::make_output_section_for_script( |
1966 | const char* name, | |
1967 | Script_sections::Section_type section_type) | |
919ed24c ILT |
1968 | { |
1969 | name = this->namepool_.add(name, false, NULL); | |
1e5d2fb1 DK |
1970 | elfcpp::Elf_Xword sh_flags = elfcpp::SHF_ALLOC; |
1971 | if (section_type == Script_sections::ST_NOLOAD) | |
1972 | sh_flags = 0; | |
919ed24c | 1973 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, |
22f0da72 ILT |
1974 | sh_flags, ORDER_INVALID, |
1975 | false); | |
919ed24c | 1976 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
1977 | if (section_type == Script_sections::ST_NOLOAD) |
1978 | os->set_is_noload(); | |
919ed24c ILT |
1979 | return os; |
1980 | } | |
1981 | ||
3802b2dd ILT |
1982 | // Return the number of segments we expect to see. |
1983 | ||
1984 | size_t | |
1985 | Layout::expected_segment_count() const | |
1986 | { | |
1987 | size_t ret = this->segment_list_.size(); | |
1988 | ||
1989 | // If we didn't see a SECTIONS clause in a linker script, we should | |
1990 | // already have the complete list of segments. Otherwise we ask the | |
1991 | // SECTIONS clause how many segments it expects, and add in the ones | |
1992 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) | |
1993 | ||
1994 | if (!this->script_options_->saw_sections_clause()) | |
1995 | return ret; | |
1996 | else | |
1997 | { | |
1998 | const Script_sections* ss = this->script_options_->script_sections(); | |
1999 | return ret + ss->expected_segment_count(this); | |
2000 | } | |
2001 | } | |
2002 | ||
35cdfc9a ILT |
2003 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
2004 | // is whether we saw a .note.GNU-stack section in the object file. | |
2005 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
2006 | // protection required for stack memory. We record this in an | |
2007 | // executable as a PT_GNU_STACK segment. If an object file does not | |
2008 | // have a .note.GNU-stack segment, we must assume that it is an old | |
2009 | // object. On some targets that will force an executable stack. | |
2010 | ||
2011 | void | |
83e17bd5 CC |
2012 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags, |
2013 | const Object* obj) | |
35cdfc9a ILT |
2014 | { |
2015 | if (!seen_gnu_stack) | |
83e17bd5 CC |
2016 | { |
2017 | this->input_without_gnu_stack_note_ = true; | |
2018 | if (parameters->options().warn_execstack() | |
2019 | && parameters->target().is_default_stack_executable()) | |
2020 | gold_warning(_("%s: missing .note.GNU-stack section" | |
2021 | " implies executable stack"), | |
2022 | obj->name().c_str()); | |
2023 | } | |
35cdfc9a ILT |
2024 | else |
2025 | { | |
2026 | this->input_with_gnu_stack_note_ = true; | |
2027 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
83e17bd5 CC |
2028 | { |
2029 | this->input_requires_executable_stack_ = true; | |
2030 | if (parameters->options().warn_execstack() | |
2031 | || parameters->options().is_stack_executable()) | |
2032 | gold_warning(_("%s: requires executable stack"), | |
2033 | obj->name().c_str()); | |
2034 | } | |
35cdfc9a ILT |
2035 | } |
2036 | } | |
2037 | ||
9c547ec3 ILT |
2038 | // Create automatic note sections. |
2039 | ||
2040 | void | |
2041 | Layout::create_notes() | |
2042 | { | |
2043 | this->create_gold_note(); | |
2044 | this->create_executable_stack_info(); | |
2045 | this->create_build_id(); | |
2046 | } | |
2047 | ||
a3ad94ed ILT |
2048 | // Create the dynamic sections which are needed before we read the |
2049 | // relocs. | |
2050 | ||
2051 | void | |
9b07f471 | 2052 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
a3ad94ed | 2053 | { |
436ca963 | 2054 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
2055 | return; |
2056 | ||
3802b2dd ILT |
2057 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
2058 | elfcpp::SHT_DYNAMIC, | |
2059 | (elfcpp::SHF_ALLOC | |
2060 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
2061 | false, ORDER_RELRO, |
2062 | true); | |
a3ad94ed | 2063 | |
6daf5215 ILT |
2064 | // A linker script may discard .dynamic, so check for NULL. |
2065 | if (this->dynamic_section_ != NULL) | |
2066 | { | |
2067 | this->dynamic_symbol_ = | |
2068 | symtab->define_in_output_data("_DYNAMIC", NULL, | |
2069 | Symbol_table::PREDEFINED, | |
2070 | this->dynamic_section_, 0, 0, | |
2071 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, | |
2072 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 2073 | |
6daf5215 | 2074 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 | 2075 | |
6daf5215 ILT |
2076 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); |
2077 | } | |
a3ad94ed ILT |
2078 | } |
2079 | ||
bfd58944 ILT |
2080 | // For each output section whose name can be represented as C symbol, |
2081 | // define __start and __stop symbols for the section. This is a GNU | |
2082 | // extension. | |
2083 | ||
2084 | void | |
9b07f471 | 2085 | Layout::define_section_symbols(Symbol_table* symtab) |
bfd58944 ILT |
2086 | { |
2087 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
2088 | p != this->section_list_.end(); | |
2089 | ++p) | |
2090 | { | |
2091 | const char* const name = (*p)->name(); | |
f1ec9ded | 2092 | if (is_cident(name)) |
bfd58944 ILT |
2093 | { |
2094 | const std::string name_string(name); | |
f1ec9ded | 2095 | const std::string start_name(cident_section_start_prefix |
2e702c99 | 2096 | + name_string); |
f1ec9ded | 2097 | const std::string stop_name(cident_section_stop_prefix |
2e702c99 | 2098 | + name_string); |
bfd58944 | 2099 | |
9b07f471 | 2100 | symtab->define_in_output_data(start_name.c_str(), |
bfd58944 | 2101 | NULL, // version |
99fff23b | 2102 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
2103 | *p, |
2104 | 0, // value | |
2105 | 0, // symsize | |
2106 | elfcpp::STT_NOTYPE, | |
2107 | elfcpp::STB_GLOBAL, | |
2108 | elfcpp::STV_DEFAULT, | |
2109 | 0, // nonvis | |
2110 | false, // offset_is_from_end | |
a445fddf | 2111 | true); // only_if_ref |
bfd58944 | 2112 | |
9b07f471 | 2113 | symtab->define_in_output_data(stop_name.c_str(), |
bfd58944 | 2114 | NULL, // version |
99fff23b | 2115 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
2116 | *p, |
2117 | 0, // value | |
2118 | 0, // symsize | |
2119 | elfcpp::STT_NOTYPE, | |
2120 | elfcpp::STB_GLOBAL, | |
2121 | elfcpp::STV_DEFAULT, | |
2122 | 0, // nonvis | |
2123 | true, // offset_is_from_end | |
a445fddf | 2124 | true); // only_if_ref |
bfd58944 ILT |
2125 | } |
2126 | } | |
2127 | } | |
2128 | ||
755ab8af ILT |
2129 | // Define symbols for group signatures. |
2130 | ||
2131 | void | |
2132 | Layout::define_group_signatures(Symbol_table* symtab) | |
2133 | { | |
2134 | for (Group_signatures::iterator p = this->group_signatures_.begin(); | |
2135 | p != this->group_signatures_.end(); | |
2136 | ++p) | |
2137 | { | |
2138 | Symbol* sym = symtab->lookup(p->signature, NULL); | |
2139 | if (sym != NULL) | |
2140 | p->section->set_info_symndx(sym); | |
2141 | else | |
2142 | { | |
2143 | // Force the name of the group section to the group | |
2144 | // signature, and use the group's section symbol as the | |
2145 | // signature symbol. | |
2146 | if (strcmp(p->section->name(), p->signature) != 0) | |
2147 | { | |
2148 | const char* name = this->namepool_.add(p->signature, | |
2149 | true, NULL); | |
2150 | p->section->set_name(name); | |
2151 | } | |
2152 | p->section->set_needs_symtab_index(); | |
2153 | p->section->set_info_section_symndx(p->section); | |
2154 | } | |
2155 | } | |
2156 | ||
2157 | this->group_signatures_.clear(); | |
2158 | } | |
2159 | ||
75f65a3e ILT |
2160 | // Find the first read-only PT_LOAD segment, creating one if |
2161 | // necessary. | |
54dc6425 | 2162 | |
75f65a3e | 2163 | Output_segment* |
2e702c99 | 2164 | Layout::find_first_load_seg(const Target* target) |
54dc6425 | 2165 | { |
0f72bf6f | 2166 | Output_segment* best = NULL; |
75f65a3e ILT |
2167 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
2168 | p != this->segment_list_.end(); | |
2169 | ++p) | |
2170 | { | |
2171 | if ((*p)->type() == elfcpp::PT_LOAD | |
2172 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
af6156ef | 2173 | && (parameters->options().omagic() |
2e702c99 RM |
2174 | || ((*p)->flags() & elfcpp::PF_W) == 0) |
2175 | && (!target->isolate_execinstr() | |
2176 | || ((*p)->flags() & elfcpp::PF_X) == 0)) | |
2177 | { | |
2178 | if (best == NULL || this->segment_precedes(*p, best)) | |
2179 | best = *p; | |
2180 | } | |
75f65a3e | 2181 | } |
0f72bf6f RÁE |
2182 | if (best != NULL) |
2183 | return best; | |
75f65a3e | 2184 | |
1c4f3631 ILT |
2185 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
2186 | ||
3802b2dd ILT |
2187 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
2188 | elfcpp::PF_R); | |
75f65a3e | 2189 | return load_seg; |
54dc6425 ILT |
2190 | } |
2191 | ||
20e6d0d6 DK |
2192 | // Save states of all current output segments. Store saved states |
2193 | // in SEGMENT_STATES. | |
2194 | ||
2195 | void | |
2196 | Layout::save_segments(Segment_states* segment_states) | |
2197 | { | |
2198 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
2199 | p != this->segment_list_.end(); | |
2200 | ++p) | |
2201 | { | |
2202 | Output_segment* segment = *p; | |
2203 | // Shallow copy. | |
2204 | Output_segment* copy = new Output_segment(*segment); | |
2205 | (*segment_states)[segment] = copy; | |
2206 | } | |
2207 | } | |
2208 | ||
2209 | // Restore states of output segments and delete any segment not found in | |
2210 | // SEGMENT_STATES. | |
2211 | ||
2212 | void | |
2213 | Layout::restore_segments(const Segment_states* segment_states) | |
2214 | { | |
2215 | // Go through the segment list and remove any segment added in the | |
2216 | // relaxation loop. | |
2217 | this->tls_segment_ = NULL; | |
2218 | this->relro_segment_ = NULL; | |
2219 | Segment_list::iterator list_iter = this->segment_list_.begin(); | |
2220 | while (list_iter != this->segment_list_.end()) | |
2221 | { | |
2222 | Output_segment* segment = *list_iter; | |
2223 | Segment_states::const_iterator states_iter = | |
2224 | segment_states->find(segment); | |
2225 | if (states_iter != segment_states->end()) | |
2226 | { | |
2227 | const Output_segment* copy = states_iter->second; | |
2228 | // Shallow copy to restore states. | |
2229 | *segment = *copy; | |
2230 | ||
2231 | // Also fix up TLS and RELRO segment pointers as appropriate. | |
2232 | if (segment->type() == elfcpp::PT_TLS) | |
2233 | this->tls_segment_ = segment; | |
2234 | else if (segment->type() == elfcpp::PT_GNU_RELRO) | |
2235 | this->relro_segment_ = segment; | |
2236 | ||
2237 | ++list_iter; | |
2e702c99 | 2238 | } |
20e6d0d6 DK |
2239 | else |
2240 | { | |
2e702c99 | 2241 | list_iter = this->segment_list_.erase(list_iter); |
20e6d0d6 DK |
2242 | // This is a segment created during section layout. It should be |
2243 | // safe to remove it since we should have removed all pointers to it. | |
2244 | delete segment; | |
2245 | } | |
2246 | } | |
2247 | } | |
2248 | ||
2249 | // Clean up after relaxation so that sections can be laid out again. | |
2250 | ||
2251 | void | |
2252 | Layout::clean_up_after_relaxation() | |
2253 | { | |
2254 | // Restore the segments to point state just prior to the relaxation loop. | |
2255 | Script_sections* script_section = this->script_options_->script_sections(); | |
2256 | script_section->release_segments(); | |
2257 | this->restore_segments(this->segment_states_); | |
2258 | ||
2259 | // Reset section addresses and file offsets | |
2260 | for (Section_list::iterator p = this->section_list_.begin(); | |
2261 | p != this->section_list_.end(); | |
2262 | ++p) | |
2263 | { | |
20e6d0d6 | 2264 | (*p)->restore_states(); |
8923b24c DK |
2265 | |
2266 | // If an input section changes size because of relaxation, | |
2267 | // we need to adjust the section offsets of all input sections. | |
2268 | // after such a section. | |
2269 | if ((*p)->section_offsets_need_adjustment()) | |
2270 | (*p)->adjust_section_offsets(); | |
2271 | ||
2272 | (*p)->reset_address_and_file_offset(); | |
20e6d0d6 | 2273 | } |
2e702c99 | 2274 | |
20e6d0d6 DK |
2275 | // Reset special output object address and file offsets. |
2276 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
2277 | p != this->special_output_list_.end(); | |
2278 | ++p) | |
2279 | (*p)->reset_address_and_file_offset(); | |
2280 | ||
2281 | // A linker script may have created some output section data objects. | |
2282 | // They are useless now. | |
2283 | for (Output_section_data_list::const_iterator p = | |
2284 | this->script_output_section_data_list_.begin(); | |
2285 | p != this->script_output_section_data_list_.end(); | |
2286 | ++p) | |
2287 | delete *p; | |
2e702c99 | 2288 | this->script_output_section_data_list_.clear(); |
20e6d0d6 DK |
2289 | } |
2290 | ||
2291 | // Prepare for relaxation. | |
2292 | ||
2293 | void | |
2294 | Layout::prepare_for_relaxation() | |
2295 | { | |
2296 | // Create an relaxation debug check if in debugging mode. | |
2297 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2298 | this->relaxation_debug_check_ = new Relaxation_debug_check(); | |
2299 | ||
2300 | // Save segment states. | |
2301 | this->segment_states_ = new Segment_states(); | |
2302 | this->save_segments(this->segment_states_); | |
2303 | ||
2304 | for(Section_list::const_iterator p = this->section_list_.begin(); | |
2305 | p != this->section_list_.end(); | |
2306 | ++p) | |
2307 | (*p)->save_states(); | |
2308 | ||
2309 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2310 | this->relaxation_debug_check_->check_output_data_for_reset_values( | |
2e702c99 | 2311 | this->section_list_, this->special_output_list_); |
20e6d0d6 DK |
2312 | |
2313 | // Also enable recording of output section data from scripts. | |
2314 | this->record_output_section_data_from_script_ = true; | |
2315 | } | |
2316 | ||
2317 | // Relaxation loop body: If target has no relaxation, this runs only once | |
2318 | // Otherwise, the target relaxation hook is called at the end of | |
2319 | // each iteration. If the hook returns true, it means re-layout of | |
2e702c99 | 2320 | // section is required. |
20e6d0d6 DK |
2321 | // |
2322 | // The number of segments created by a linking script without a PHDRS | |
2323 | // clause may be affected by section sizes and alignments. There is | |
2324 | // a remote chance that relaxation causes different number of PT_LOAD | |
2325 | // segments are created and sections are attached to different segments. | |
2326 | // Therefore, we always throw away all segments created during section | |
2327 | // layout. In order to be able to restart the section layout, we keep | |
2328 | // a copy of the segment list right before the relaxation loop and use | |
2329 | // that to restore the segments. | |
2e702c99 RM |
2330 | // |
2331 | // PASS is the current relaxation pass number. | |
20e6d0d6 DK |
2332 | // SYMTAB is a symbol table. |
2333 | // PLOAD_SEG is the address of a pointer for the load segment. | |
2334 | // PHDR_SEG is a pointer to the PHDR segment. | |
2335 | // SEGMENT_HEADERS points to the output segment header. | |
2336 | // FILE_HEADER points to the output file header. | |
2337 | // PSHNDX is the address to store the output section index. | |
2338 | ||
2339 | off_t inline | |
2340 | Layout::relaxation_loop_body( | |
2341 | int pass, | |
2342 | Target* target, | |
2343 | Symbol_table* symtab, | |
2344 | Output_segment** pload_seg, | |
2345 | Output_segment* phdr_seg, | |
2346 | Output_segment_headers* segment_headers, | |
2347 | Output_file_header* file_header, | |
2348 | unsigned int* pshndx) | |
2349 | { | |
2350 | // If this is not the first iteration, we need to clean up after | |
2351 | // relaxation so that we can lay out the sections again. | |
2352 | if (pass != 0) | |
2353 | this->clean_up_after_relaxation(); | |
2354 | ||
2355 | // If there is a SECTIONS clause, put all the input sections into | |
2356 | // the required order. | |
2357 | Output_segment* load_seg; | |
2358 | if (this->script_options_->saw_sections_clause()) | |
2359 | load_seg = this->set_section_addresses_from_script(symtab); | |
2360 | else if (parameters->options().relocatable()) | |
2361 | load_seg = NULL; | |
2362 | else | |
2e702c99 | 2363 | load_seg = this->find_first_load_seg(target); |
20e6d0d6 DK |
2364 | |
2365 | if (parameters->options().oformat_enum() | |
2366 | != General_options::OBJECT_FORMAT_ELF) | |
2367 | load_seg = NULL; | |
2368 | ||
403a15dd ILT |
2369 | // If the user set the address of the text segment, that may not be |
2370 | // compatible with putting the segment headers and file headers into | |
2371 | // that segment. | |
d12a5ea8 | 2372 | if (parameters->options().user_set_Ttext() |
a1373b60 | 2373 | && parameters->options().Ttext() % target->abi_pagesize() != 0) |
d12a5ea8 ILT |
2374 | { |
2375 | load_seg = NULL; | |
2376 | phdr_seg = NULL; | |
2377 | } | |
403a15dd | 2378 | |
68b6574b ILT |
2379 | gold_assert(phdr_seg == NULL |
2380 | || load_seg != NULL | |
2381 | || this->script_options_->saw_sections_clause()); | |
20e6d0d6 | 2382 | |
a192ba05 | 2383 | // If the address of the load segment we found has been set by |
1e3811b0 ILT |
2384 | // --section-start rather than by a script, then adjust the VMA and |
2385 | // LMA downward if possible to include the file and section headers. | |
2386 | uint64_t header_gap = 0; | |
a192ba05 ILT |
2387 | if (load_seg != NULL |
2388 | && load_seg->are_addresses_set() | |
1e3811b0 ILT |
2389 | && !this->script_options_->saw_sections_clause() |
2390 | && !parameters->options().relocatable()) | |
2391 | { | |
2392 | file_header->finalize_data_size(); | |
2393 | segment_headers->finalize_data_size(); | |
2394 | size_t sizeof_headers = (file_header->data_size() | |
2395 | + segment_headers->data_size()); | |
2396 | const uint64_t abi_pagesize = target->abi_pagesize(); | |
2397 | uint64_t hdr_paddr = load_seg->paddr() - sizeof_headers; | |
2398 | hdr_paddr &= ~(abi_pagesize - 1); | |
2399 | uint64_t subtract = load_seg->paddr() - hdr_paddr; | |
2400 | if (load_seg->paddr() < subtract || load_seg->vaddr() < subtract) | |
2401 | load_seg = NULL; | |
2402 | else | |
2403 | { | |
2404 | load_seg->set_addresses(load_seg->vaddr() - subtract, | |
2405 | load_seg->paddr() - subtract); | |
2406 | header_gap = subtract - sizeof_headers; | |
2407 | } | |
2408 | } | |
a192ba05 | 2409 | |
20e6d0d6 DK |
2410 | // Lay out the segment headers. |
2411 | if (!parameters->options().relocatable()) | |
2412 | { | |
2413 | gold_assert(segment_headers != NULL); | |
1e3811b0 ILT |
2414 | if (header_gap != 0 && load_seg != NULL) |
2415 | { | |
2416 | Output_data_zero_fill* z = new Output_data_zero_fill(header_gap, 1); | |
2417 | load_seg->add_initial_output_data(z); | |
2418 | } | |
20e6d0d6 | 2419 | if (load_seg != NULL) |
2e702c99 | 2420 | load_seg->add_initial_output_data(segment_headers); |
20e6d0d6 | 2421 | if (phdr_seg != NULL) |
2e702c99 | 2422 | phdr_seg->add_initial_output_data(segment_headers); |
20e6d0d6 DK |
2423 | } |
2424 | ||
2425 | // Lay out the file header. | |
2426 | if (load_seg != NULL) | |
2427 | load_seg->add_initial_output_data(file_header); | |
2428 | ||
2429 | if (this->script_options_->saw_phdrs_clause() | |
2430 | && !parameters->options().relocatable()) | |
2431 | { | |
2432 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS | |
2433 | // clause in a linker script. | |
2434 | Script_sections* ss = this->script_options_->script_sections(); | |
2435 | ss->put_headers_in_phdrs(file_header, segment_headers); | |
2436 | } | |
2437 | ||
2438 | // We set the output section indexes in set_segment_offsets and | |
2439 | // set_section_indexes. | |
2440 | *pshndx = 1; | |
2441 | ||
2442 | // Set the file offsets of all the segments, and all the sections | |
2443 | // they contain. | |
2444 | off_t off; | |
2445 | if (!parameters->options().relocatable()) | |
2446 | off = this->set_segment_offsets(target, load_seg, pshndx); | |
2447 | else | |
2448 | off = this->set_relocatable_section_offsets(file_header, pshndx); | |
2449 | ||
2450 | // Verify that the dummy relaxation does not change anything. | |
2451 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2452 | { | |
2453 | if (pass == 0) | |
2454 | this->relaxation_debug_check_->read_sections(this->section_list_); | |
2455 | else | |
2456 | this->relaxation_debug_check_->verify_sections(this->section_list_); | |
2457 | } | |
2458 | ||
2459 | *pload_seg = load_seg; | |
2460 | return off; | |
2461 | } | |
2462 | ||
6e9ba2ca ST |
2463 | // Search the list of patterns and find the postion of the given section |
2464 | // name in the output section. If the section name matches a glob | |
2465 | // pattern and a non-glob name, then the non-glob position takes | |
2466 | // precedence. Return 0 if no match is found. | |
2467 | ||
2468 | unsigned int | |
2469 | Layout::find_section_order_index(const std::string& section_name) | |
2470 | { | |
2471 | Unordered_map<std::string, unsigned int>::iterator map_it; | |
2472 | map_it = this->input_section_position_.find(section_name); | |
2473 | if (map_it != this->input_section_position_.end()) | |
2474 | return map_it->second; | |
2475 | ||
2476 | // Absolute match failed. Linear search the glob patterns. | |
2477 | std::vector<std::string>::iterator it; | |
2478 | for (it = this->input_section_glob_.begin(); | |
2479 | it != this->input_section_glob_.end(); | |
2480 | ++it) | |
2481 | { | |
2482 | if (fnmatch((*it).c_str(), section_name.c_str(), FNM_NOESCAPE) == 0) | |
2e702c99 RM |
2483 | { |
2484 | map_it = this->input_section_position_.find(*it); | |
2485 | gold_assert(map_it != this->input_section_position_.end()); | |
2486 | return map_it->second; | |
2487 | } | |
6e9ba2ca ST |
2488 | } |
2489 | return 0; | |
2490 | } | |
2491 | ||
2492 | // Read the sequence of input sections from the file specified with | |
e9552f7e | 2493 | // option --section-ordering-file. |
6e9ba2ca ST |
2494 | |
2495 | void | |
2496 | Layout::read_layout_from_file() | |
2497 | { | |
2498 | const char* filename = parameters->options().section_ordering_file(); | |
2499 | std::ifstream in; | |
2500 | std::string line; | |
2501 | ||
2502 | in.open(filename); | |
2503 | if (!in) | |
2504 | gold_fatal(_("unable to open --section-ordering-file file %s: %s"), | |
2e702c99 | 2505 | filename, strerror(errno)); |
6e9ba2ca ST |
2506 | |
2507 | std::getline(in, line); // this chops off the trailing \n, if any | |
2508 | unsigned int position = 1; | |
e9552f7e | 2509 | this->set_section_ordering_specified(); |
6e9ba2ca ST |
2510 | |
2511 | while (in) | |
2512 | { | |
2513 | if (!line.empty() && line[line.length() - 1] == '\r') // Windows | |
2e702c99 | 2514 | line.resize(line.length() - 1); |
6e9ba2ca ST |
2515 | // Ignore comments, beginning with '#' |
2516 | if (line[0] == '#') | |
2e702c99 RM |
2517 | { |
2518 | std::getline(in, line); | |
2519 | continue; | |
2520 | } | |
6e9ba2ca ST |
2521 | this->input_section_position_[line] = position; |
2522 | // Store all glob patterns in a vector. | |
2523 | if (is_wildcard_string(line.c_str())) | |
2e702c99 | 2524 | this->input_section_glob_.push_back(line); |
6e9ba2ca ST |
2525 | position++; |
2526 | std::getline(in, line); | |
2527 | } | |
2528 | } | |
2529 | ||
54dc6425 ILT |
2530 | // Finalize the layout. When this is called, we have created all the |
2531 | // output sections and all the output segments which are based on | |
2532 | // input sections. We have several things to do, and we have to do | |
2533 | // them in the right order, so that we get the right results correctly | |
2534 | // and efficiently. | |
2535 | ||
2536 | // 1) Finalize the list of output segments and create the segment | |
2537 | // table header. | |
2538 | ||
2539 | // 2) Finalize the dynamic symbol table and associated sections. | |
2540 | ||
2541 | // 3) Determine the final file offset of all the output segments. | |
2542 | ||
2543 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
2544 | // sections. | |
2545 | ||
75f65a3e ILT |
2546 | // 5) Create the symbol table sections and the section name table |
2547 | // section. | |
2548 | ||
2549 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
2550 | // value and make a final determination of which symbols are going |
2551 | // into the output symbol table. | |
2552 | ||
54dc6425 ILT |
2553 | // 7) Create the section table header. |
2554 | ||
2555 | // 8) Determine the final file offset of all the output sections which | |
2556 | // are not SHF_ALLOC, including the section table header. | |
2557 | ||
2558 | // 9) Finalize the ELF file header. | |
2559 | ||
75f65a3e ILT |
2560 | // This function returns the size of the output file. |
2561 | ||
2562 | off_t | |
17a1d0a9 | 2563 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
8851ecca | 2564 | Target* target, const Task* task) |
54dc6425 | 2565 | { |
f59f41f3 | 2566 | target->finalize_sections(this, input_objects, symtab); |
5a6f7e2d | 2567 | |
17a1d0a9 | 2568 | this->count_local_symbols(task, input_objects); |
7bf1f802 | 2569 | |
1518dc8f | 2570 | this->link_stabs_sections(); |
4f211c8b | 2571 | |
3802b2dd | 2572 | Output_segment* phdr_seg = NULL; |
8851ecca | 2573 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
54dc6425 | 2574 | { |
dbe717ef ILT |
2575 | // There was a dynamic object in the link. We need to create |
2576 | // some information for the dynamic linker. | |
2577 | ||
3802b2dd ILT |
2578 | // Create the PT_PHDR segment which will hold the program |
2579 | // headers. | |
1c4f3631 ILT |
2580 | if (!this->script_options_->saw_phdrs_clause()) |
2581 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
3802b2dd | 2582 | |
14b31740 ILT |
2583 | // Create the dynamic symbol table, including the hash table. |
2584 | Output_section* dynstr; | |
2585 | std::vector<Symbol*> dynamic_symbols; | |
2586 | unsigned int local_dynamic_count; | |
a5dc0706 | 2587 | Versions versions(*this->script_options()->version_script_info(), |
2e702c99 | 2588 | &this->dynpool_); |
9b07f471 | 2589 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
14b31740 ILT |
2590 | &local_dynamic_count, &dynamic_symbols, |
2591 | &versions); | |
dbe717ef ILT |
2592 | |
2593 | // Create the .interp section to hold the name of the | |
e1f74f98 ILT |
2594 | // interpreter, and put it in a PT_INTERP segment. Don't do it |
2595 | // if we saw a .interp section in an input file. | |
2596 | if ((!parameters->options().shared() | |
2597 | || parameters->options().dynamic_linker() != NULL) | |
2598 | && this->interp_segment_ == NULL) | |
2e702c99 | 2599 | this->create_interp(target); |
a3ad94ed ILT |
2600 | |
2601 | // Finish the .dynamic section to hold the dynamic data, and put | |
2602 | // it in a PT_DYNAMIC segment. | |
16649710 | 2603 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
2604 | |
2605 | // We should have added everything we need to the dynamic string | |
2606 | // table. | |
2607 | this->dynpool_.set_string_offsets(); | |
2608 | ||
2609 | // Create the version sections. We can't do this until the | |
2610 | // dynamic string table is complete. | |
46fe1623 | 2611 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
14b31740 | 2612 | dynamic_symbols, dynstr); |
f0ba79e2 ILT |
2613 | |
2614 | // Set the size of the _DYNAMIC symbol. We can't do this until | |
2615 | // after we call create_version_sections. | |
2616 | this->set_dynamic_symbol_size(symtab); | |
54dc6425 | 2617 | } |
2e702c99 | 2618 | |
20e6d0d6 DK |
2619 | // Create segment headers. |
2620 | Output_segment_headers* segment_headers = | |
2621 | (parameters->options().relocatable() | |
2622 | ? NULL | |
2623 | : new Output_segment_headers(this->segment_list_)); | |
75f65a3e ILT |
2624 | |
2625 | // Lay out the file header. | |
a10ae760 ILT |
2626 | Output_file_header* file_header = new Output_file_header(target, symtab, |
2627 | segment_headers); | |
a445fddf | 2628 | |
61ba1cf9 | 2629 | this->special_output_list_.push_back(file_header); |
6a74a719 ILT |
2630 | if (segment_headers != NULL) |
2631 | this->special_output_list_.push_back(segment_headers); | |
75f65a3e | 2632 | |
20e6d0d6 DK |
2633 | // Find approriate places for orphan output sections if we are using |
2634 | // a linker script. | |
2635 | if (this->script_options_->saw_sections_clause()) | |
2636 | this->place_orphan_sections_in_script(); | |
2e702c99 | 2637 | |
20e6d0d6 DK |
2638 | Output_segment* load_seg; |
2639 | off_t off; | |
2640 | unsigned int shndx; | |
2641 | int pass = 0; | |
2642 | ||
2643 | // Take a snapshot of the section layout as needed. | |
2644 | if (target->may_relax()) | |
2645 | this->prepare_for_relaxation(); | |
2e702c99 | 2646 | |
20e6d0d6 DK |
2647 | // Run the relaxation loop to lay out sections. |
2648 | do | |
1c4f3631 | 2649 | { |
20e6d0d6 DK |
2650 | off = this->relaxation_loop_body(pass, target, symtab, &load_seg, |
2651 | phdr_seg, segment_headers, file_header, | |
2652 | &shndx); | |
2653 | pass++; | |
1c4f3631 | 2654 | } |
c0a62865 | 2655 | while (target->may_relax() |
f625ae50 | 2656 | && target->relax(pass, input_objects, symtab, this, task)); |
75f65a3e | 2657 | |
eabc84f4 RM |
2658 | // If there is a load segment that contains the file and program headers, |
2659 | // provide a symbol __ehdr_start pointing there. | |
2660 | // A program can use this to examine itself robustly. | |
2661 | if (load_seg != NULL) | |
2662 | symtab->define_in_output_segment("__ehdr_start", NULL, | |
2663 | Symbol_table::PREDEFINED, load_seg, 0, 0, | |
2664 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
2665 | elfcpp::STV_DEFAULT, 0, | |
2666 | Symbol::SEGMENT_START, true); | |
2667 | ||
a9a60db6 ILT |
2668 | // Set the file offsets of all the non-data sections we've seen so |
2669 | // far which don't have to wait for the input sections. We need | |
2670 | // this in order to finalize local symbols in non-allocated | |
2671 | // sections. | |
2672 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); | |
2673 | ||
d491d34e ILT |
2674 | // Set the section indexes of all unallocated sections seen so far, |
2675 | // in case any of them are somehow referenced by a symbol. | |
2676 | shndx = this->set_section_indexes(shndx); | |
2677 | ||
75f65a3e | 2678 | // Create the symbol table sections. |
d491d34e | 2679 | this->create_symtab_sections(input_objects, symtab, shndx, &off); |
7bf1f802 ILT |
2680 | if (!parameters->doing_static_link()) |
2681 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e | 2682 | |
e5756efb ILT |
2683 | // Process any symbol assignments from a linker script. This must |
2684 | // be called after the symbol table has been finalized. | |
2685 | this->script_options_->finalize_symbols(symtab, this); | |
2686 | ||
09ec0418 CC |
2687 | // Create the incremental inputs sections. |
2688 | if (this->incremental_inputs_) | |
2689 | { | |
2690 | this->incremental_inputs_->finalize(); | |
2691 | this->create_incremental_info_sections(symtab); | |
2692 | } | |
2693 | ||
75f65a3e ILT |
2694 | // Create the .shstrtab section. |
2695 | Output_section* shstrtab_section = this->create_shstrtab(); | |
2696 | ||
a9a60db6 ILT |
2697 | // Set the file offsets of the rest of the non-data sections which |
2698 | // don't have to wait for the input sections. | |
9a0910c3 | 2699 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 | 2700 | |
d491d34e ILT |
2701 | // Now that all sections have been created, set the section indexes |
2702 | // for any sections which haven't been done yet. | |
86887060 | 2703 | shndx = this->set_section_indexes(shndx); |
ead1e424 | 2704 | |
75f65a3e | 2705 | // Create the section table header. |
d491d34e | 2706 | this->create_shdrs(shstrtab_section, &off); |
75f65a3e | 2707 | |
17a1d0a9 ILT |
2708 | // If there are no sections which require postprocessing, we can |
2709 | // handle the section names now, and avoid a resize later. | |
2710 | if (!this->any_postprocessing_sections_) | |
09ec0418 CC |
2711 | { |
2712 | off = this->set_section_offsets(off, | |
2713 | POSTPROCESSING_SECTIONS_PASS); | |
2714 | off = | |
2715 | this->set_section_offsets(off, | |
17a1d0a9 | 2716 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); |
09ec0418 | 2717 | } |
17a1d0a9 | 2718 | |
27bc2bce | 2719 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 2720 | |
27bc2bce ILT |
2721 | // Now we know exactly where everything goes in the output file |
2722 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 2723 | Output_data::layout_complete(); |
75f65a3e | 2724 | |
e44fcf3b ILT |
2725 | this->output_file_size_ = off; |
2726 | ||
75f65a3e ILT |
2727 | return off; |
2728 | } | |
2729 | ||
8ed814a9 | 2730 | // Create a note header following the format defined in the ELF ABI. |
ec3f783e ILT |
2731 | // NAME is the name, NOTE_TYPE is the type, SECTION_NAME is the name |
2732 | // of the section to create, DESCSZ is the size of the descriptor. | |
2733 | // ALLOCATE is true if the section should be allocated in memory. | |
2734 | // This returns the new note section. It sets *TRAILING_PADDING to | |
2735 | // the number of trailing zero bytes required. | |
4f211c8b | 2736 | |
8ed814a9 | 2737 | Output_section* |
ef4ab7a8 PP |
2738 | Layout::create_note(const char* name, int note_type, |
2739 | const char* section_name, size_t descsz, | |
8ed814a9 | 2740 | bool allocate, size_t* trailing_padding) |
4f211c8b | 2741 | { |
e2305dc0 ILT |
2742 | // Authorities all agree that the values in a .note field should |
2743 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
2744 | // they differ on what the alignment is for 64-bit binaries. | |
2745 | // The GABI says unambiguously they take 8-byte alignment: | |
2746 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
2747 | // Other documentation says alignment should always be 4 bytes: | |
2748 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
2749 | // GNU ld and GNU readelf both support the latter (at least as of | |
2750 | // version 2.16.91), and glibc always generates the latter for | |
2751 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
2752 | // here. | |
35cdfc9a | 2753 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
8851ecca | 2754 | const int size = parameters->target().get_size(); |
e2305dc0 ILT |
2755 | #else |
2756 | const int size = 32; | |
2757 | #endif | |
4f211c8b ILT |
2758 | |
2759 | // The contents of the .note section. | |
4f211c8b ILT |
2760 | size_t namesz = strlen(name) + 1; |
2761 | size_t aligned_namesz = align_address(namesz, size / 8); | |
4f211c8b | 2762 | size_t aligned_descsz = align_address(descsz, size / 8); |
4f211c8b | 2763 | |
8ed814a9 | 2764 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
4f211c8b | 2765 | |
8ed814a9 ILT |
2766 | unsigned char* buffer = new unsigned char[notehdrsz]; |
2767 | memset(buffer, 0, notehdrsz); | |
4f211c8b | 2768 | |
8851ecca | 2769 | bool is_big_endian = parameters->target().is_big_endian(); |
4f211c8b ILT |
2770 | |
2771 | if (size == 32) | |
2772 | { | |
2773 | if (!is_big_endian) | |
2774 | { | |
2775 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
2776 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
2777 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
2778 | } | |
2779 | else | |
2780 | { | |
2781 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
2782 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
2783 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
2784 | } | |
2785 | } | |
2786 | else if (size == 64) | |
2787 | { | |
2788 | if (!is_big_endian) | |
2789 | { | |
2790 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
2791 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
2792 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
2793 | } | |
2794 | else | |
2795 | { | |
2796 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
2797 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
2798 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
2799 | } | |
2800 | } | |
2801 | else | |
2802 | gold_unreachable(); | |
2803 | ||
2804 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
4f211c8b | 2805 | |
8ed814a9 | 2806 | elfcpp::Elf_Xword flags = 0; |
22f0da72 | 2807 | Output_section_order order = ORDER_INVALID; |
8ed814a9 | 2808 | if (allocate) |
22f0da72 ILT |
2809 | { |
2810 | flags = elfcpp::SHF_ALLOC; | |
2811 | order = ORDER_RO_NOTE; | |
2812 | } | |
ec3f783e ILT |
2813 | Output_section* os = this->choose_output_section(NULL, section_name, |
2814 | elfcpp::SHT_NOTE, | |
22f0da72 | 2815 | flags, false, order, false); |
9c547ec3 ILT |
2816 | if (os == NULL) |
2817 | return NULL; | |
2818 | ||
8ed814a9 | 2819 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, |
7d9e3d98 ILT |
2820 | size / 8, |
2821 | "** note header"); | |
8ed814a9 ILT |
2822 | os->add_output_section_data(posd); |
2823 | ||
2824 | *trailing_padding = aligned_descsz - descsz; | |
2825 | ||
2826 | return os; | |
2827 | } | |
2828 | ||
2829 | // For an executable or shared library, create a note to record the | |
2830 | // version of gold used to create the binary. | |
2831 | ||
2832 | void | |
2833 | Layout::create_gold_note() | |
2834 | { | |
cdc29364 CC |
2835 | if (parameters->options().relocatable() |
2836 | || parameters->incremental_update()) | |
8ed814a9 ILT |
2837 | return; |
2838 | ||
2839 | std::string desc = std::string("gold ") + gold::get_version_string(); | |
2840 | ||
2841 | size_t trailing_padding; | |
ca09d69a | 2842 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, |
ef4ab7a8 PP |
2843 | ".note.gnu.gold-version", desc.size(), |
2844 | false, &trailing_padding); | |
9c547ec3 ILT |
2845 | if (os == NULL) |
2846 | return; | |
8ed814a9 ILT |
2847 | |
2848 | Output_section_data* posd = new Output_data_const(desc, 4); | |
4f211c8b | 2849 | os->add_output_section_data(posd); |
8ed814a9 ILT |
2850 | |
2851 | if (trailing_padding > 0) | |
2852 | { | |
7d9e3d98 | 2853 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
2854 | os->add_output_section_data(posd); |
2855 | } | |
4f211c8b ILT |
2856 | } |
2857 | ||
35cdfc9a ILT |
2858 | // Record whether the stack should be executable. This can be set |
2859 | // from the command line using the -z execstack or -z noexecstack | |
2860 | // options. Otherwise, if any input file has a .note.GNU-stack | |
2861 | // section with the SHF_EXECINSTR flag set, the stack should be | |
2862 | // executable. Otherwise, if at least one input file a | |
2863 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
2864 | // section, we use the target default for whether the stack should be | |
2865 | // executable. Otherwise, we don't generate a stack note. When | |
2866 | // generating a object file, we create a .note.GNU-stack section with | |
2867 | // the appropriate marking. When generating an executable or shared | |
2868 | // library, we create a PT_GNU_STACK segment. | |
2869 | ||
2870 | void | |
9c547ec3 | 2871 | Layout::create_executable_stack_info() |
35cdfc9a ILT |
2872 | { |
2873 | bool is_stack_executable; | |
e55bde5e ILT |
2874 | if (parameters->options().is_execstack_set()) |
2875 | is_stack_executable = parameters->options().is_stack_executable(); | |
35cdfc9a ILT |
2876 | else if (!this->input_with_gnu_stack_note_) |
2877 | return; | |
2878 | else | |
2879 | { | |
2880 | if (this->input_requires_executable_stack_) | |
2881 | is_stack_executable = true; | |
2882 | else if (this->input_without_gnu_stack_note_) | |
9c547ec3 ILT |
2883 | is_stack_executable = |
2884 | parameters->target().is_default_stack_executable(); | |
35cdfc9a ILT |
2885 | else |
2886 | is_stack_executable = false; | |
2887 | } | |
2888 | ||
8851ecca | 2889 | if (parameters->options().relocatable()) |
35cdfc9a ILT |
2890 | { |
2891 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
2892 | elfcpp::Elf_Xword flags = 0; | |
2893 | if (is_stack_executable) | |
2894 | flags |= elfcpp::SHF_EXECINSTR; | |
22f0da72 ILT |
2895 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags, |
2896 | ORDER_INVALID, false); | |
35cdfc9a ILT |
2897 | } |
2898 | else | |
2899 | { | |
1c4f3631 ILT |
2900 | if (this->script_options_->saw_phdrs_clause()) |
2901 | return; | |
35cdfc9a ILT |
2902 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
2903 | if (is_stack_executable) | |
2904 | flags |= elfcpp::PF_X; | |
3802b2dd | 2905 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); |
35cdfc9a ILT |
2906 | } |
2907 | } | |
2908 | ||
8ed814a9 ILT |
2909 | // If --build-id was used, set up the build ID note. |
2910 | ||
2911 | void | |
2912 | Layout::create_build_id() | |
2913 | { | |
2914 | if (!parameters->options().user_set_build_id()) | |
2915 | return; | |
2916 | ||
2917 | const char* style = parameters->options().build_id(); | |
2918 | if (strcmp(style, "none") == 0) | |
2919 | return; | |
2920 | ||
2921 | // Set DESCSZ to the size of the note descriptor. When possible, | |
2922 | // set DESC to the note descriptor contents. | |
2923 | size_t descsz; | |
2924 | std::string desc; | |
2925 | if (strcmp(style, "md5") == 0) | |
2926 | descsz = 128 / 8; | |
2927 | else if (strcmp(style, "sha1") == 0) | |
2928 | descsz = 160 / 8; | |
2929 | else if (strcmp(style, "uuid") == 0) | |
2930 | { | |
2931 | const size_t uuidsz = 128 / 8; | |
2932 | ||
2933 | char buffer[uuidsz]; | |
2934 | memset(buffer, 0, uuidsz); | |
2935 | ||
2a00e4fb | 2936 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
8ed814a9 ILT |
2937 | if (descriptor < 0) |
2938 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), | |
2939 | strerror(errno)); | |
2940 | else | |
2941 | { | |
2942 | ssize_t got = ::read(descriptor, buffer, uuidsz); | |
2a00e4fb | 2943 | release_descriptor(descriptor, true); |
8ed814a9 ILT |
2944 | if (got < 0) |
2945 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); | |
2946 | else if (static_cast<size_t>(got) != uuidsz) | |
2947 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), | |
2948 | uuidsz, got); | |
2949 | } | |
2950 | ||
2951 | desc.assign(buffer, uuidsz); | |
2952 | descsz = uuidsz; | |
2953 | } | |
2954 | else if (strncmp(style, "0x", 2) == 0) | |
2955 | { | |
2956 | hex_init(); | |
2957 | const char* p = style + 2; | |
2958 | while (*p != '\0') | |
2959 | { | |
2960 | if (hex_p(p[0]) && hex_p(p[1])) | |
2961 | { | |
2962 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); | |
2963 | desc += c; | |
2964 | p += 2; | |
2965 | } | |
2966 | else if (*p == '-' || *p == ':') | |
2967 | ++p; | |
2968 | else | |
2969 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), | |
2970 | style); | |
2971 | } | |
2972 | descsz = desc.size(); | |
2973 | } | |
2974 | else | |
2975 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); | |
2976 | ||
2977 | // Create the note. | |
2978 | size_t trailing_padding; | |
2979 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, | |
ef4ab7a8 PP |
2980 | ".note.gnu.build-id", descsz, true, |
2981 | &trailing_padding); | |
9c547ec3 ILT |
2982 | if (os == NULL) |
2983 | return; | |
8ed814a9 ILT |
2984 | |
2985 | if (!desc.empty()) | |
2986 | { | |
2987 | // We know the value already, so we fill it in now. | |
2988 | gold_assert(desc.size() == descsz); | |
2989 | ||
2990 | Output_section_data* posd = new Output_data_const(desc, 4); | |
2991 | os->add_output_section_data(posd); | |
2992 | ||
2993 | if (trailing_padding != 0) | |
2994 | { | |
7d9e3d98 | 2995 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
2996 | os->add_output_section_data(posd); |
2997 | } | |
2998 | } | |
2999 | else | |
3000 | { | |
3001 | // We need to compute a checksum after we have completed the | |
3002 | // link. | |
3003 | gold_assert(trailing_padding == 0); | |
7d9e3d98 | 3004 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
8ed814a9 | 3005 | os->add_output_section_data(this->build_id_note_); |
8ed814a9 ILT |
3006 | } |
3007 | } | |
3008 | ||
1518dc8f ILT |
3009 | // If we have both .stabXX and .stabXXstr sections, then the sh_link |
3010 | // field of the former should point to the latter. I'm not sure who | |
3011 | // started this, but the GNU linker does it, and some tools depend | |
3012 | // upon it. | |
3013 | ||
3014 | void | |
3015 | Layout::link_stabs_sections() | |
3016 | { | |
3017 | if (!this->have_stabstr_section_) | |
3018 | return; | |
3019 | ||
3020 | for (Section_list::iterator p = this->section_list_.begin(); | |
3021 | p != this->section_list_.end(); | |
3022 | ++p) | |
3023 | { | |
3024 | if ((*p)->type() != elfcpp::SHT_STRTAB) | |
3025 | continue; | |
3026 | ||
3027 | const char* name = (*p)->name(); | |
3028 | if (strncmp(name, ".stab", 5) != 0) | |
3029 | continue; | |
3030 | ||
3031 | size_t len = strlen(name); | |
3032 | if (strcmp(name + len - 3, "str") != 0) | |
3033 | continue; | |
3034 | ||
3035 | std::string stab_name(name, len - 3); | |
3036 | Output_section* stab_sec; | |
3037 | stab_sec = this->find_output_section(stab_name.c_str()); | |
3038 | if (stab_sec != NULL) | |
3039 | stab_sec->set_link_section(*p); | |
3040 | } | |
3041 | } | |
3042 | ||
09ec0418 | 3043 | // Create .gnu_incremental_inputs and related sections needed |
3ce2c28e ILT |
3044 | // for the next run of incremental linking to check what has changed. |
3045 | ||
3046 | void | |
09ec0418 | 3047 | Layout::create_incremental_info_sections(Symbol_table* symtab) |
3ce2c28e | 3048 | { |
09ec0418 CC |
3049 | Incremental_inputs* incr = this->incremental_inputs_; |
3050 | ||
3051 | gold_assert(incr != NULL); | |
3052 | ||
3053 | // Create the .gnu_incremental_inputs, _symtab, and _relocs input sections. | |
3054 | incr->create_data_sections(symtab); | |
3ce2c28e ILT |
3055 | |
3056 | // Add the .gnu_incremental_inputs section. | |
ca09d69a | 3057 | const char* incremental_inputs_name = |
3ce2c28e | 3058 | this->namepool_.add(".gnu_incremental_inputs", false, NULL); |
09ec0418 | 3059 | Output_section* incremental_inputs_os = |
3ce2c28e | 3060 | this->make_output_section(incremental_inputs_name, |
f5c870d2 | 3061 | elfcpp::SHT_GNU_INCREMENTAL_INPUTS, 0, |
22f0da72 | 3062 | ORDER_INVALID, false); |
09ec0418 CC |
3063 | incremental_inputs_os->add_output_section_data(incr->inputs_section()); |
3064 | ||
3065 | // Add the .gnu_incremental_symtab section. | |
ca09d69a | 3066 | const char* incremental_symtab_name = |
09ec0418 CC |
3067 | this->namepool_.add(".gnu_incremental_symtab", false, NULL); |
3068 | Output_section* incremental_symtab_os = | |
3069 | this->make_output_section(incremental_symtab_name, | |
3070 | elfcpp::SHT_GNU_INCREMENTAL_SYMTAB, 0, | |
3071 | ORDER_INVALID, false); | |
3072 | incremental_symtab_os->add_output_section_data(incr->symtab_section()); | |
3073 | incremental_symtab_os->set_entsize(4); | |
3074 | ||
3075 | // Add the .gnu_incremental_relocs section. | |
ca09d69a | 3076 | const char* incremental_relocs_name = |
09ec0418 CC |
3077 | this->namepool_.add(".gnu_incremental_relocs", false, NULL); |
3078 | Output_section* incremental_relocs_os = | |
3079 | this->make_output_section(incremental_relocs_name, | |
3080 | elfcpp::SHT_GNU_INCREMENTAL_RELOCS, 0, | |
3081 | ORDER_INVALID, false); | |
3082 | incremental_relocs_os->add_output_section_data(incr->relocs_section()); | |
3083 | incremental_relocs_os->set_entsize(incr->relocs_entsize()); | |
3084 | ||
0e70b911 | 3085 | // Add the .gnu_incremental_got_plt section. |
ca09d69a | 3086 | const char* incremental_got_plt_name = |
0e70b911 CC |
3087 | this->namepool_.add(".gnu_incremental_got_plt", false, NULL); |
3088 | Output_section* incremental_got_plt_os = | |
3089 | this->make_output_section(incremental_got_plt_name, | |
3090 | elfcpp::SHT_GNU_INCREMENTAL_GOT_PLT, 0, | |
3091 | ORDER_INVALID, false); | |
3092 | incremental_got_plt_os->add_output_section_data(incr->got_plt_section()); | |
3093 | ||
3ce2c28e | 3094 | // Add the .gnu_incremental_strtab section. |
ca09d69a | 3095 | const char* incremental_strtab_name = |
3ce2c28e | 3096 | this->namepool_.add(".gnu_incremental_strtab", false, NULL); |
09ec0418 | 3097 | Output_section* incremental_strtab_os = this->make_output_section(incremental_strtab_name, |
2e702c99 RM |
3098 | elfcpp::SHT_STRTAB, 0, |
3099 | ORDER_INVALID, false); | |
3ce2c28e | 3100 | Output_data_strtab* strtab_data = |
09ec0418 CC |
3101 | new Output_data_strtab(incr->get_stringpool()); |
3102 | incremental_strtab_os->add_output_section_data(strtab_data); | |
3103 | ||
3104 | incremental_inputs_os->set_after_input_sections(); | |
3105 | incremental_symtab_os->set_after_input_sections(); | |
3106 | incremental_relocs_os->set_after_input_sections(); | |
0e70b911 | 3107 | incremental_got_plt_os->set_after_input_sections(); |
09ec0418 CC |
3108 | |
3109 | incremental_inputs_os->set_link_section(incremental_strtab_os); | |
3110 | incremental_symtab_os->set_link_section(incremental_inputs_os); | |
3111 | incremental_relocs_os->set_link_section(incremental_inputs_os); | |
0e70b911 | 3112 | incremental_got_plt_os->set_link_section(incremental_inputs_os); |
3ce2c28e ILT |
3113 | } |
3114 | ||
75f65a3e ILT |
3115 | // Return whether SEG1 should be before SEG2 in the output file. This |
3116 | // is based entirely on the segment type and flags. When this is | |
aecf301f | 3117 | // called the segment addresses have normally not yet been set. |
75f65a3e ILT |
3118 | |
3119 | bool | |
3120 | Layout::segment_precedes(const Output_segment* seg1, | |
3121 | const Output_segment* seg2) | |
3122 | { | |
3123 | elfcpp::Elf_Word type1 = seg1->type(); | |
3124 | elfcpp::Elf_Word type2 = seg2->type(); | |
3125 | ||
3126 | // The single PT_PHDR segment is required to precede any loadable | |
3127 | // segment. We simply make it always first. | |
3128 | if (type1 == elfcpp::PT_PHDR) | |
3129 | { | |
a3ad94ed | 3130 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
3131 | return true; |
3132 | } | |
3133 | if (type2 == elfcpp::PT_PHDR) | |
3134 | return false; | |
3135 | ||
3136 | // The single PT_INTERP segment is required to precede any loadable | |
3137 | // segment. We simply make it always second. | |
3138 | if (type1 == elfcpp::PT_INTERP) | |
3139 | { | |
a3ad94ed | 3140 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
3141 | return true; |
3142 | } | |
3143 | if (type2 == elfcpp::PT_INTERP) | |
3144 | return false; | |
3145 | ||
3146 | // We then put PT_LOAD segments before any other segments. | |
3147 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
3148 | return true; | |
3149 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
3150 | return false; | |
3151 | ||
9f1d377b ILT |
3152 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
3153 | // segment, because that is where the dynamic linker expects to find | |
3154 | // it (this is just for efficiency; other positions would also work | |
3155 | // correctly). | |
3156 | if (type1 == elfcpp::PT_TLS | |
3157 | && type2 != elfcpp::PT_TLS | |
3158 | && type2 != elfcpp::PT_GNU_RELRO) | |
3159 | return false; | |
3160 | if (type2 == elfcpp::PT_TLS | |
3161 | && type1 != elfcpp::PT_TLS | |
3162 | && type1 != elfcpp::PT_GNU_RELRO) | |
3163 | return true; | |
3164 | ||
3165 | // We put the PT_GNU_RELRO segment last, because that is where the | |
3166 | // dynamic linker expects to find it (as with PT_TLS, this is just | |
3167 | // for efficiency). | |
3168 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) | |
92e059d8 | 3169 | return false; |
9f1d377b | 3170 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
92e059d8 ILT |
3171 | return true; |
3172 | ||
75f65a3e ILT |
3173 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
3174 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
3175 | ||
3176 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
3177 | // by the numeric segment type and flags values. There should not | |
3178 | // be more than one segment with the same type and flags. | |
3179 | if (type1 != elfcpp::PT_LOAD) | |
3180 | { | |
3181 | if (type1 != type2) | |
3182 | return type1 < type2; | |
a3ad94ed | 3183 | gold_assert(flags1 != flags2); |
75f65a3e ILT |
3184 | return flags1 < flags2; |
3185 | } | |
3186 | ||
a445fddf ILT |
3187 | // If the addresses are set already, sort by load address. |
3188 | if (seg1->are_addresses_set()) | |
3189 | { | |
3190 | if (!seg2->are_addresses_set()) | |
3191 | return true; | |
3192 | ||
3193 | unsigned int section_count1 = seg1->output_section_count(); | |
3194 | unsigned int section_count2 = seg2->output_section_count(); | |
3195 | if (section_count1 == 0 && section_count2 > 0) | |
3196 | return true; | |
3197 | if (section_count1 > 0 && section_count2 == 0) | |
3198 | return false; | |
3199 | ||
b8fa8750 NC |
3200 | uint64_t paddr1 = (seg1->are_addresses_set() |
3201 | ? seg1->paddr() | |
3202 | : seg1->first_section_load_address()); | |
3203 | uint64_t paddr2 = (seg2->are_addresses_set() | |
3204 | ? seg2->paddr() | |
3205 | : seg2->first_section_load_address()); | |
3206 | ||
a445fddf ILT |
3207 | if (paddr1 != paddr2) |
3208 | return paddr1 < paddr2; | |
3209 | } | |
3210 | else if (seg2->are_addresses_set()) | |
3211 | return false; | |
3212 | ||
8a5e3e08 ILT |
3213 | // A segment which holds large data comes after a segment which does |
3214 | // not hold large data. | |
3215 | if (seg1->is_large_data_segment()) | |
3216 | { | |
3217 | if (!seg2->is_large_data_segment()) | |
3218 | return false; | |
3219 | } | |
3220 | else if (seg2->is_large_data_segment()) | |
3221 | return true; | |
3222 | ||
3223 | // Otherwise, we sort PT_LOAD segments based on the flags. Readonly | |
3224 | // segments come before writable segments. Then writable segments | |
3225 | // with data come before writable segments without data. Then | |
3226 | // executable segments come before non-executable segments. Then | |
3227 | // the unlikely case of a non-readable segment comes before the | |
3228 | // normal case of a readable segment. If there are multiple | |
3229 | // segments with the same type and flags, we require that the | |
3230 | // address be set, and we sort by virtual address and then physical | |
3231 | // address. | |
75f65a3e ILT |
3232 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
3233 | return (flags1 & elfcpp::PF_W) == 0; | |
756ac4a8 ILT |
3234 | if ((flags1 & elfcpp::PF_W) != 0 |
3235 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) | |
3236 | return seg1->has_any_data_sections(); | |
75f65a3e ILT |
3237 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
3238 | return (flags1 & elfcpp::PF_X) != 0; | |
3239 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
3240 | return (flags1 & elfcpp::PF_R) == 0; | |
3241 | ||
a445fddf | 3242 | // We shouldn't get here--we shouldn't create segments which we |
aecf301f | 3243 | // can't distinguish. Unless of course we are using a weird linker |
16164a6b ST |
3244 | // script or overlapping --section-start options. We could also get |
3245 | // here if plugins want unique segments for subsets of sections. | |
ea0d8c47 | 3246 | gold_assert(this->script_options_->saw_phdrs_clause() |
16164a6b ST |
3247 | || parameters->options().any_section_start() |
3248 | || this->is_unique_segment_for_sections_specified()); | |
aecf301f | 3249 | return false; |
75f65a3e ILT |
3250 | } |
3251 | ||
8a5e3e08 ILT |
3252 | // Increase OFF so that it is congruent to ADDR modulo ABI_PAGESIZE. |
3253 | ||
3254 | static off_t | |
3255 | align_file_offset(off_t off, uint64_t addr, uint64_t abi_pagesize) | |
3256 | { | |
3257 | uint64_t unsigned_off = off; | |
3258 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) | |
3259 | | (addr & (abi_pagesize - 1))); | |
3260 | if (aligned_off < unsigned_off) | |
3261 | aligned_off += abi_pagesize; | |
3262 | return aligned_off; | |
3263 | } | |
3264 | ||
ead1e424 ILT |
3265 | // Set the file offsets of all the segments, and all the sections they |
3266 | // contain. They have all been created. LOAD_SEG must be be laid out | |
3267 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
3268 | |
3269 | off_t | |
ead1e424 | 3270 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
ca09d69a | 3271 | unsigned int* pshndx) |
75f65a3e | 3272 | { |
aecf301f ILT |
3273 | // Sort them into the final order. We use a stable sort so that we |
3274 | // don't randomize the order of indistinguishable segments created | |
3275 | // by linker scripts. | |
3276 | std::stable_sort(this->segment_list_.begin(), this->segment_list_.end(), | |
3277 | Layout::Compare_segments(this)); | |
54dc6425 | 3278 | |
75f65a3e ILT |
3279 | // Find the PT_LOAD segments, and set their addresses and offsets |
3280 | // and their section's addresses and offsets. | |
2e702c99 | 3281 | uint64_t start_addr; |
e55bde5e | 3282 | if (parameters->options().user_set_Ttext()) |
2e702c99 | 3283 | start_addr = parameters->options().Ttext(); |
374ad285 | 3284 | else if (parameters->options().output_is_position_independent()) |
2e702c99 | 3285 | start_addr = 0; |
0c5e9c22 | 3286 | else |
2e702c99 RM |
3287 | start_addr = target->default_text_segment_address(); |
3288 | ||
3289 | uint64_t addr = start_addr; | |
75f65a3e | 3290 | off_t off = 0; |
a445fddf ILT |
3291 | |
3292 | // If LOAD_SEG is NULL, then the file header and segment headers | |
3293 | // will not be loadable. But they still need to be at offset 0 in | |
3294 | // the file. Set their offsets now. | |
3295 | if (load_seg == NULL) | |
3296 | { | |
3297 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
3298 | p != this->special_output_list_.end(); | |
3299 | ++p) | |
3300 | { | |
3301 | off = align_address(off, (*p)->addralign()); | |
3302 | (*p)->set_address_and_file_offset(0, off); | |
3303 | off += (*p)->data_size(); | |
3304 | } | |
3305 | } | |
3306 | ||
1a2dff53 ILT |
3307 | unsigned int increase_relro = this->increase_relro_; |
3308 | if (this->script_options_->saw_sections_clause()) | |
3309 | increase_relro = 0; | |
3310 | ||
34810851 ILT |
3311 | const bool check_sections = parameters->options().check_sections(); |
3312 | Output_segment* last_load_segment = NULL; | |
3313 | ||
2e702c99 RM |
3314 | unsigned int shndx_begin = *pshndx; |
3315 | unsigned int shndx_load_seg = *pshndx; | |
3316 | ||
75f65a3e ILT |
3317 | for (Segment_list::iterator p = this->segment_list_.begin(); |
3318 | p != this->segment_list_.end(); | |
3319 | ++p) | |
3320 | { | |
3321 | if ((*p)->type() == elfcpp::PT_LOAD) | |
3322 | { | |
2e702c99 RM |
3323 | if (target->isolate_execinstr()) |
3324 | { | |
3325 | // When we hit the segment that should contain the | |
3326 | // file headers, reset the file offset so we place | |
3327 | // it and subsequent segments appropriately. | |
3328 | // We'll fix up the preceding segments below. | |
3329 | if (load_seg == *p) | |
3330 | { | |
3331 | if (off == 0) | |
3332 | load_seg = NULL; | |
3333 | else | |
3334 | { | |
3335 | off = 0; | |
3336 | shndx_load_seg = *pshndx; | |
3337 | } | |
3338 | } | |
3339 | } | |
3340 | else | |
3341 | { | |
3342 | // Verify that the file headers fall into the first segment. | |
3343 | if (load_seg != NULL && load_seg != *p) | |
3344 | gold_unreachable(); | |
3345 | load_seg = NULL; | |
3346 | } | |
75f65a3e | 3347 | |
756ac4a8 ILT |
3348 | bool are_addresses_set = (*p)->are_addresses_set(); |
3349 | if (are_addresses_set) | |
3350 | { | |
3351 | // When it comes to setting file offsets, we care about | |
3352 | // the physical address. | |
3353 | addr = (*p)->paddr(); | |
3354 | } | |
9590bf25 | 3355 | else if (parameters->options().user_set_Ttext() |
ebacd51e AM |
3356 | && (parameters->options().omagic() |
3357 | || ((*p)->flags() & elfcpp::PF_W) == 0)) | |
9590bf25 CC |
3358 | { |
3359 | are_addresses_set = true; | |
3360 | } | |
e55bde5e | 3361 | else if (parameters->options().user_set_Tdata() |
756ac4a8 | 3362 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
e55bde5e | 3363 | && (!parameters->options().user_set_Tbss() |
756ac4a8 ILT |
3364 | || (*p)->has_any_data_sections())) |
3365 | { | |
e55bde5e | 3366 | addr = parameters->options().Tdata(); |
756ac4a8 ILT |
3367 | are_addresses_set = true; |
3368 | } | |
e55bde5e | 3369 | else if (parameters->options().user_set_Tbss() |
756ac4a8 ILT |
3370 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
3371 | && !(*p)->has_any_data_sections()) | |
3372 | { | |
e55bde5e | 3373 | addr = parameters->options().Tbss(); |
756ac4a8 ILT |
3374 | are_addresses_set = true; |
3375 | } | |
3376 | ||
75f65a3e ILT |
3377 | uint64_t orig_addr = addr; |
3378 | uint64_t orig_off = off; | |
3379 | ||
a445fddf | 3380 | uint64_t aligned_addr = 0; |
75f65a3e | 3381 | uint64_t abi_pagesize = target->abi_pagesize(); |
af6156ef | 3382 | uint64_t common_pagesize = target->common_pagesize(); |
0496d5e5 | 3383 | |
af6156ef ILT |
3384 | if (!parameters->options().nmagic() |
3385 | && !parameters->options().omagic()) | |
a1373b60 | 3386 | (*p)->set_minimum_p_align(abi_pagesize); |
0496d5e5 | 3387 | |
8a5e3e08 | 3388 | if (!are_addresses_set) |
a445fddf | 3389 | { |
a6577478 RÁE |
3390 | // Skip the address forward one page, maintaining the same |
3391 | // position within the page. This lets us store both segments | |
3392 | // overlapping on a single page in the file, but the loader will | |
3393 | // put them on different pages in memory. We will revisit this | |
3394 | // decision once we know the size of the segment. | |
a445fddf ILT |
3395 | |
3396 | addr = align_address(addr, (*p)->maximum_alignment()); | |
75f65a3e | 3397 | aligned_addr = addr; |
a445fddf | 3398 | |
2e702c99 RM |
3399 | if (load_seg == *p) |
3400 | { | |
3401 | // This is the segment that will contain the file | |
3402 | // headers, so its offset will have to be exactly zero. | |
3403 | gold_assert(orig_off == 0); | |
3404 | ||
3405 | // If the target wants a fixed minimum distance from the | |
3406 | // text segment to the read-only segment, move up now. | |
3407 | uint64_t min_addr = start_addr + target->rosegment_gap(); | |
3408 | if (addr < min_addr) | |
3409 | addr = min_addr; | |
3410 | ||
3411 | // But this is not the first segment! To make its | |
3412 | // address congruent with its offset, that address better | |
3413 | // be aligned to the ABI-mandated page size. | |
3414 | addr = align_address(addr, abi_pagesize); | |
3415 | aligned_addr = addr; | |
3416 | } | |
3417 | else | |
3418 | { | |
3419 | if ((addr & (abi_pagesize - 1)) != 0) | |
3420 | addr = addr + abi_pagesize; | |
a445fddf | 3421 | |
2e702c99 RM |
3422 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
3423 | } | |
75f65a3e ILT |
3424 | } |
3425 | ||
8a5e3e08 ILT |
3426 | if (!parameters->options().nmagic() |
3427 | && !parameters->options().omagic()) | |
3428 | off = align_file_offset(off, addr, abi_pagesize); | |
2e702c99 | 3429 | else |
661be1e2 ILT |
3430 | { |
3431 | // This is -N or -n with a section script which prevents | |
3432 | // us from using a load segment. We need to ensure that | |
3433 | // the file offset is aligned to the alignment of the | |
3434 | // segment. This is because the linker script | |
3435 | // implicitly assumed a zero offset. If we don't align | |
3436 | // here, then the alignment of the sections in the | |
3437 | // linker script may not match the alignment of the | |
3438 | // sections in the set_section_addresses call below, | |
3439 | // causing an error about dot moving backward. | |
3440 | off = align_address(off, (*p)->maximum_alignment()); | |
3441 | } | |
8a5e3e08 | 3442 | |
ead1e424 | 3443 | unsigned int shndx_hold = *pshndx; |
fc497986 | 3444 | bool has_relro = false; |
96a2b4e4 | 3445 | uint64_t new_addr = (*p)->set_section_addresses(this, false, addr, |
fd064a5b | 3446 | &increase_relro, |
fc497986 | 3447 | &has_relro, |
2e702c99 | 3448 | &off, pshndx); |
75f65a3e ILT |
3449 | |
3450 | // Now that we know the size of this segment, we may be able | |
3451 | // to save a page in memory, at the cost of wasting some | |
3452 | // file space, by instead aligning to the start of a new | |
3453 | // page. Here we use the real machine page size rather than | |
fc497986 CC |
3454 | // the ABI mandated page size. If the segment has been |
3455 | // aligned so that the relro data ends at a page boundary, | |
3456 | // we do not try to realign it. | |
75f65a3e | 3457 | |
cdc29364 CC |
3458 | if (!are_addresses_set |
3459 | && !has_relro | |
3460 | && aligned_addr != addr | |
fb0e076f | 3461 | && !parameters->incremental()) |
75f65a3e | 3462 | { |
75f65a3e ILT |
3463 | uint64_t first_off = (common_pagesize |
3464 | - (aligned_addr | |
3465 | & (common_pagesize - 1))); | |
3466 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
3467 | if (first_off > 0 | |
3468 | && last_off > 0 | |
3469 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
3470 | != (new_addr & ~ (common_pagesize - 1))) | |
3471 | && first_off + last_off <= common_pagesize) | |
3472 | { | |
ead1e424 ILT |
3473 | *pshndx = shndx_hold; |
3474 | addr = align_address(aligned_addr, common_pagesize); | |
a445fddf | 3475 | addr = align_address(addr, (*p)->maximum_alignment()); |
815a1205 AM |
3476 | if ((addr & (abi_pagesize - 1)) != 0) |
3477 | addr = addr + abi_pagesize; | |
75f65a3e | 3478 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
8a5e3e08 | 3479 | off = align_file_offset(off, addr, abi_pagesize); |
3bb951e5 ILT |
3480 | |
3481 | increase_relro = this->increase_relro_; | |
3482 | if (this->script_options_->saw_sections_clause()) | |
3483 | increase_relro = 0; | |
3484 | has_relro = false; | |
3485 | ||
96a2b4e4 | 3486 | new_addr = (*p)->set_section_addresses(this, true, addr, |
fd064a5b | 3487 | &increase_relro, |
fc497986 | 3488 | &has_relro, |
2e702c99 | 3489 | &off, pshndx); |
75f65a3e ILT |
3490 | } |
3491 | } | |
3492 | ||
3493 | addr = new_addr; | |
3494 | ||
34810851 ILT |
3495 | // Implement --check-sections. We know that the segments |
3496 | // are sorted by LMA. | |
3497 | if (check_sections && last_load_segment != NULL) | |
3498 | { | |
3499 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); | |
3500 | if (last_load_segment->paddr() + last_load_segment->memsz() | |
3501 | > (*p)->paddr()) | |
3502 | { | |
3503 | unsigned long long lb1 = last_load_segment->paddr(); | |
3504 | unsigned long long le1 = lb1 + last_load_segment->memsz(); | |
3505 | unsigned long long lb2 = (*p)->paddr(); | |
3506 | unsigned long long le2 = lb2 + (*p)->memsz(); | |
3507 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " | |
3508 | "[0x%llx -> 0x%llx]"), | |
3509 | lb1, le1, lb2, le2); | |
3510 | } | |
3511 | } | |
3512 | last_load_segment = *p; | |
75f65a3e ILT |
3513 | } |
3514 | } | |
3515 | ||
2e702c99 RM |
3516 | if (load_seg != NULL && target->isolate_execinstr()) |
3517 | { | |
3518 | // Process the early segments again, setting their file offsets | |
3519 | // so they land after the segments starting at LOAD_SEG. | |
3520 | off = align_file_offset(off, 0, target->abi_pagesize()); | |
3521 | ||
3522 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
3523 | *p != load_seg; | |
3524 | ++p) | |
3525 | { | |
3526 | if ((*p)->type() == elfcpp::PT_LOAD) | |
3527 | { | |
3528 | // We repeat the whole job of assigning addresses and | |
3529 | // offsets, but we really only want to change the offsets and | |
3530 | // must ensure that the addresses all come out the same as | |
3531 | // they did the first time through. | |
3532 | bool has_relro = false; | |
3533 | const uint64_t old_addr = (*p)->vaddr(); | |
3534 | const uint64_t old_end = old_addr + (*p)->memsz(); | |
3535 | uint64_t new_addr = (*p)->set_section_addresses(this, true, | |
3536 | old_addr, | |
3537 | &increase_relro, | |
3538 | &has_relro, | |
3539 | &off, | |
3540 | &shndx_begin); | |
3541 | gold_assert(new_addr == old_end); | |
3542 | } | |
3543 | } | |
3544 | ||
3545 | gold_assert(shndx_begin == shndx_load_seg); | |
3546 | } | |
3547 | ||
75f65a3e ILT |
3548 | // Handle the non-PT_LOAD segments, setting their offsets from their |
3549 | // section's offsets. | |
3550 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
3551 | p != this->segment_list_.end(); | |
3552 | ++p) | |
3553 | { | |
3554 | if ((*p)->type() != elfcpp::PT_LOAD) | |
1a2dff53 ILT |
3555 | (*p)->set_offset((*p)->type() == elfcpp::PT_GNU_RELRO |
3556 | ? increase_relro | |
3557 | : 0); | |
75f65a3e ILT |
3558 | } |
3559 | ||
7bf1f802 ILT |
3560 | // Set the TLS offsets for each section in the PT_TLS segment. |
3561 | if (this->tls_segment_ != NULL) | |
3562 | this->tls_segment_->set_tls_offsets(); | |
3563 | ||
75f65a3e ILT |
3564 | return off; |
3565 | } | |
3566 | ||
6a74a719 ILT |
3567 | // Set the offsets of all the allocated sections when doing a |
3568 | // relocatable link. This does the same jobs as set_segment_offsets, | |
3569 | // only for a relocatable link. | |
3570 | ||
3571 | off_t | |
3572 | Layout::set_relocatable_section_offsets(Output_data* file_header, | |
ca09d69a | 3573 | unsigned int* pshndx) |
6a74a719 ILT |
3574 | { |
3575 | off_t off = 0; | |
3576 | ||
3577 | file_header->set_address_and_file_offset(0, 0); | |
3578 | off += file_header->data_size(); | |
3579 | ||
3580 | for (Section_list::iterator p = this->section_list_.begin(); | |
3581 | p != this->section_list_.end(); | |
3582 | ++p) | |
3583 | { | |
3584 | // We skip unallocated sections here, except that group sections | |
3585 | // have to come first. | |
3586 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 | |
3587 | && (*p)->type() != elfcpp::SHT_GROUP) | |
3588 | continue; | |
3589 | ||
3590 | off = align_address(off, (*p)->addralign()); | |
3591 | ||
3592 | // The linker script might have set the address. | |
3593 | if (!(*p)->is_address_valid()) | |
3594 | (*p)->set_address(0); | |
3595 | (*p)->set_file_offset(off); | |
3596 | (*p)->finalize_data_size(); | |
3597 | off += (*p)->data_size(); | |
3598 | ||
3599 | (*p)->set_out_shndx(*pshndx); | |
3600 | ++*pshndx; | |
3601 | } | |
3602 | ||
3603 | return off; | |
3604 | } | |
3605 | ||
75f65a3e ILT |
3606 | // Set the file offset of all the sections not associated with a |
3607 | // segment. | |
3608 | ||
3609 | off_t | |
9a0910c3 | 3610 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 3611 | { |
cdc29364 CC |
3612 | off_t startoff = off; |
3613 | off_t maxoff = off; | |
3614 | ||
a3ad94ed ILT |
3615 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
3616 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
3617 | ++p) |
3618 | { | |
27bc2bce ILT |
3619 | // The symtab section is handled in create_symtab_sections. |
3620 | if (*p == this->symtab_section_) | |
61ba1cf9 | 3621 | continue; |
27bc2bce | 3622 | |
a9a60db6 ILT |
3623 | // If we've already set the data size, don't set it again. |
3624 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) | |
3625 | continue; | |
3626 | ||
96803768 ILT |
3627 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
3628 | && (*p)->requires_postprocessing()) | |
17a1d0a9 ILT |
3629 | { |
3630 | (*p)->create_postprocessing_buffer(); | |
3631 | this->any_postprocessing_sections_ = true; | |
3632 | } | |
96803768 | 3633 | |
9a0910c3 | 3634 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2e702c99 RM |
3635 | && (*p)->after_input_sections()) |
3636 | continue; | |
17a1d0a9 | 3637 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
2e702c99 RM |
3638 | && (!(*p)->after_input_sections() |
3639 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
3640 | continue; | |
17a1d0a9 | 3641 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
2e702c99 RM |
3642 | && (!(*p)->after_input_sections() |
3643 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
3644 | continue; | |
27bc2bce | 3645 | |
cdc29364 CC |
3646 | if (!parameters->incremental_update()) |
3647 | { | |
3648 | off = align_address(off, (*p)->addralign()); | |
3649 | (*p)->set_file_offset(off); | |
3650 | (*p)->finalize_data_size(); | |
3651 | } | |
3652 | else | |
3653 | { | |
3654 | // Incremental update: allocate file space from free list. | |
3655 | (*p)->pre_finalize_data_size(); | |
3656 | off_t current_size = (*p)->current_data_size(); | |
3657 | off = this->allocate(current_size, (*p)->addralign(), startoff); | |
3658 | if (off == -1) | |
3659 | { | |
3660 | if (is_debugging_enabled(DEBUG_INCREMENTAL)) | |
2e702c99 | 3661 | this->free_list_.dump(); |
cdc29364 | 3662 | gold_assert((*p)->output_section() != NULL); |
e6455dfb CC |
3663 | gold_fallback(_("out of patch space for section %s; " |
3664 | "relink with --incremental-full"), | |
3665 | (*p)->output_section()->name()); | |
cdc29364 CC |
3666 | } |
3667 | (*p)->set_file_offset(off); | |
3668 | (*p)->finalize_data_size(); | |
3669 | if ((*p)->data_size() > current_size) | |
3670 | { | |
3671 | gold_assert((*p)->output_section() != NULL); | |
e6455dfb CC |
3672 | gold_fallback(_("%s: section changed size; " |
3673 | "relink with --incremental-full"), | |
3674 | (*p)->output_section()->name()); | |
cdc29364 CC |
3675 | } |
3676 | gold_debug(DEBUG_INCREMENTAL, | |
3677 | "set_section_offsets: %08lx %08lx %s", | |
3678 | static_cast<long>(off), | |
3679 | static_cast<long>((*p)->data_size()), | |
3680 | ((*p)->output_section() != NULL | |
3681 | ? (*p)->output_section()->name() : "(special)")); | |
3682 | } | |
3683 | ||
75f65a3e | 3684 | off += (*p)->data_size(); |
cdc29364 | 3685 | if (off > maxoff) |
2e702c99 | 3686 | maxoff = off; |
96803768 ILT |
3687 | |
3688 | // At this point the name must be set. | |
17a1d0a9 | 3689 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
96803768 | 3690 | this->namepool_.add((*p)->name(), false, NULL); |
75f65a3e | 3691 | } |
cdc29364 | 3692 | return maxoff; |
75f65a3e ILT |
3693 | } |
3694 | ||
86887060 ILT |
3695 | // Set the section indexes of all the sections not associated with a |
3696 | // segment. | |
3697 | ||
3698 | unsigned int | |
3699 | Layout::set_section_indexes(unsigned int shndx) | |
3700 | { | |
3701 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
3702 | p != this->unattached_section_list_.end(); | |
3703 | ++p) | |
3704 | { | |
d491d34e ILT |
3705 | if (!(*p)->has_out_shndx()) |
3706 | { | |
3707 | (*p)->set_out_shndx(shndx); | |
3708 | ++shndx; | |
3709 | } | |
86887060 ILT |
3710 | } |
3711 | return shndx; | |
3712 | } | |
3713 | ||
a445fddf ILT |
3714 | // Set the section addresses according to the linker script. This is |
3715 | // only called when we see a SECTIONS clause. This returns the | |
3716 | // program segment which should hold the file header and segment | |
3717 | // headers, if any. It will return NULL if they should not be in a | |
3718 | // segment. | |
3719 | ||
3720 | Output_segment* | |
3721 | Layout::set_section_addresses_from_script(Symbol_table* symtab) | |
20e6d0d6 DK |
3722 | { |
3723 | Script_sections* ss = this->script_options_->script_sections(); | |
3724 | gold_assert(ss->saw_sections_clause()); | |
3725 | return this->script_options_->set_section_addresses(symtab, this); | |
3726 | } | |
3727 | ||
3728 | // Place the orphan sections in the linker script. | |
3729 | ||
3730 | void | |
3731 | Layout::place_orphan_sections_in_script() | |
a445fddf ILT |
3732 | { |
3733 | Script_sections* ss = this->script_options_->script_sections(); | |
3734 | gold_assert(ss->saw_sections_clause()); | |
3735 | ||
3736 | // Place each orphaned output section in the script. | |
3737 | for (Section_list::iterator p = this->section_list_.begin(); | |
3738 | p != this->section_list_.end(); | |
3739 | ++p) | |
3740 | { | |
3741 | if (!(*p)->found_in_sections_clause()) | |
3742 | ss->place_orphan(*p); | |
3743 | } | |
a445fddf ILT |
3744 | } |
3745 | ||
7bf1f802 ILT |
3746 | // Count the local symbols in the regular symbol table and the dynamic |
3747 | // symbol table, and build the respective string pools. | |
3748 | ||
3749 | void | |
17a1d0a9 ILT |
3750 | Layout::count_local_symbols(const Task* task, |
3751 | const Input_objects* input_objects) | |
7bf1f802 | 3752 | { |
6d013333 ILT |
3753 | // First, figure out an upper bound on the number of symbols we'll |
3754 | // be inserting into each pool. This helps us create the pools with | |
3755 | // the right size, to avoid unnecessary hashtable resizing. | |
3756 | unsigned int symbol_count = 0; | |
3757 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
3758 | p != input_objects->relobj_end(); | |
3759 | ++p) | |
3760 | symbol_count += (*p)->local_symbol_count(); | |
3761 | ||
3762 | // Go from "upper bound" to "estimate." We overcount for two | |
3763 | // reasons: we double-count symbols that occur in more than one | |
3764 | // object file, and we count symbols that are dropped from the | |
3765 | // output. Add it all together and assume we overcount by 100%. | |
3766 | symbol_count /= 2; | |
3767 | ||
3768 | // We assume all symbols will go into both the sympool and dynpool. | |
3769 | this->sympool_.reserve(symbol_count); | |
3770 | this->dynpool_.reserve(symbol_count); | |
3771 | ||
7bf1f802 ILT |
3772 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
3773 | p != input_objects->relobj_end(); | |
3774 | ++p) | |
3775 | { | |
17a1d0a9 | 3776 | Task_lock_obj<Object> tlo(task, *p); |
7bf1f802 ILT |
3777 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
3778 | } | |
3779 | } | |
3780 | ||
b8e6aad9 ILT |
3781 | // Create the symbol table sections. Here we also set the final |
3782 | // values of the symbols. At this point all the loadable sections are | |
d491d34e | 3783 | // fully laid out. SHNUM is the number of sections so far. |
75f65a3e ILT |
3784 | |
3785 | void | |
9025d29d | 3786 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 3787 | Symbol_table* symtab, |
d491d34e | 3788 | unsigned int shnum, |
16649710 | 3789 | off_t* poff) |
75f65a3e | 3790 | { |
61ba1cf9 ILT |
3791 | int symsize; |
3792 | unsigned int align; | |
8851ecca | 3793 | if (parameters->target().get_size() == 32) |
61ba1cf9 ILT |
3794 | { |
3795 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
3796 | align = 4; | |
3797 | } | |
8851ecca | 3798 | else if (parameters->target().get_size() == 64) |
61ba1cf9 ILT |
3799 | { |
3800 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
3801 | align = 8; | |
3802 | } | |
3803 | else | |
a3ad94ed | 3804 | gold_unreachable(); |
61ba1cf9 | 3805 | |
cdc29364 CC |
3806 | // Compute file offsets relative to the start of the symtab section. |
3807 | off_t off = 0; | |
61ba1cf9 ILT |
3808 | |
3809 | // Save space for the dummy symbol at the start of the section. We | |
3810 | // never bother to write this out--it will just be left as zero. | |
3811 | off += symsize; | |
c06b7b0b | 3812 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 3813 | |
a3ad94ed ILT |
3814 | // Add STT_SECTION symbols for each Output section which needs one. |
3815 | for (Section_list::iterator p = this->section_list_.begin(); | |
3816 | p != this->section_list_.end(); | |
3817 | ++p) | |
3818 | { | |
3819 | if (!(*p)->needs_symtab_index()) | |
3820 | (*p)->set_symtab_index(-1U); | |
3821 | else | |
3822 | { | |
3823 | (*p)->set_symtab_index(local_symbol_index); | |
3824 | ++local_symbol_index; | |
3825 | off += symsize; | |
3826 | } | |
3827 | } | |
3828 | ||
f6ce93d6 ILT |
3829 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
3830 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
3831 | ++p) |
3832 | { | |
c06b7b0b | 3833 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
2e702c99 | 3834 | off, symtab); |
c06b7b0b ILT |
3835 | off += (index - local_symbol_index) * symsize; |
3836 | local_symbol_index = index; | |
75f65a3e ILT |
3837 | } |
3838 | ||
c06b7b0b | 3839 | unsigned int local_symcount = local_symbol_index; |
cdc29364 | 3840 | gold_assert(static_cast<off_t>(local_symcount * symsize) == off); |
61ba1cf9 | 3841 | |
16649710 ILT |
3842 | off_t dynoff; |
3843 | size_t dyn_global_index; | |
3844 | size_t dyncount; | |
3845 | if (this->dynsym_section_ == NULL) | |
3846 | { | |
3847 | dynoff = 0; | |
3848 | dyn_global_index = 0; | |
3849 | dyncount = 0; | |
3850 | } | |
3851 | else | |
3852 | { | |
3853 | dyn_global_index = this->dynsym_section_->info(); | |
3854 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); | |
3855 | dynoff = this->dynsym_section_->offset() + locsize; | |
3856 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 3857 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
3858 | == this->dynsym_section_->data_size() - locsize); |
3859 | } | |
3860 | ||
cdc29364 | 3861 | off_t global_off = off; |
55a93433 ILT |
3862 | off = symtab->finalize(off, dynoff, dyn_global_index, dyncount, |
3863 | &this->sympool_, &local_symcount); | |
75f65a3e | 3864 | |
8851ecca | 3865 | if (!parameters->options().strip_all()) |
9e2dcb77 ILT |
3866 | { |
3867 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 3868 | |
cfd73a4e | 3869 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
3870 | Output_section* osymtab = this->make_output_section(symtab_name, |
3871 | elfcpp::SHT_SYMTAB, | |
22f0da72 ILT |
3872 | 0, ORDER_INVALID, |
3873 | false); | |
9e2dcb77 | 3874 | this->symtab_section_ = osymtab; |
a3ad94ed | 3875 | |
cdc29364 | 3876 | Output_section_data* pos = new Output_data_fixed_space(off, align, |
7d9e3d98 | 3877 | "** symtab"); |
9e2dcb77 | 3878 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 3879 | |
d491d34e ILT |
3880 | // We generate a .symtab_shndx section if we have more than |
3881 | // SHN_LORESERVE sections. Technically it is possible that we | |
3882 | // don't need one, because it is possible that there are no | |
3883 | // symbols in any of sections with indexes larger than | |
3884 | // SHN_LORESERVE. That is probably unusual, though, and it is | |
3885 | // easier to always create one than to compute section indexes | |
3886 | // twice (once here, once when writing out the symbols). | |
3887 | if (shnum >= elfcpp::SHN_LORESERVE) | |
3888 | { | |
3889 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", | |
3890 | false, NULL); | |
3891 | Output_section* osymtab_xindex = | |
3892 | this->make_output_section(symtab_xindex_name, | |
22f0da72 ILT |
3893 | elfcpp::SHT_SYMTAB_SHNDX, 0, |
3894 | ORDER_INVALID, false); | |
d491d34e | 3895 | |
cdc29364 | 3896 | size_t symcount = off / symsize; |
d491d34e ILT |
3897 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); |
3898 | ||
3899 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); | |
3900 | ||
3901 | osymtab_xindex->set_link_section(osymtab); | |
3902 | osymtab_xindex->set_addralign(4); | |
3903 | osymtab_xindex->set_entsize(4); | |
3904 | ||
3905 | osymtab_xindex->set_after_input_sections(); | |
3906 | ||
3907 | // This tells the driver code to wait until the symbol table | |
3908 | // has written out before writing out the postprocessing | |
3909 | // sections, including the .symtab_shndx section. | |
3910 | this->any_postprocessing_sections_ = true; | |
3911 | } | |
3912 | ||
cfd73a4e | 3913 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
3914 | Output_section* ostrtab = this->make_output_section(strtab_name, |
3915 | elfcpp::SHT_STRTAB, | |
22f0da72 ILT |
3916 | 0, ORDER_INVALID, |
3917 | false); | |
a3ad94ed | 3918 | |
9e2dcb77 ILT |
3919 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
3920 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 3921 | |
cdc29364 CC |
3922 | off_t symtab_off; |
3923 | if (!parameters->incremental_update()) | |
3924 | symtab_off = align_address(*poff, align); | |
3925 | else | |
3926 | { | |
3927 | symtab_off = this->allocate(off, align, *poff); | |
2e702c99 | 3928 | if (off == -1) |
e6455dfb CC |
3929 | gold_fallback(_("out of patch space for symbol table; " |
3930 | "relink with --incremental-full")); | |
cdc29364 CC |
3931 | gold_debug(DEBUG_INCREMENTAL, |
3932 | "create_symtab_sections: %08lx %08lx .symtab", | |
3933 | static_cast<long>(symtab_off), | |
3934 | static_cast<long>(off)); | |
3935 | } | |
3936 | ||
3937 | symtab->set_file_offset(symtab_off + global_off); | |
3938 | osymtab->set_file_offset(symtab_off); | |
27bc2bce | 3939 | osymtab->finalize_data_size(); |
9e2dcb77 ILT |
3940 | osymtab->set_link_section(ostrtab); |
3941 | osymtab->set_info(local_symcount); | |
3942 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 3943 | |
cdc29364 CC |
3944 | if (symtab_off + off > *poff) |
3945 | *poff = symtab_off + off; | |
9e2dcb77 | 3946 | } |
75f65a3e ILT |
3947 | } |
3948 | ||
3949 | // Create the .shstrtab section, which holds the names of the | |
3950 | // sections. At the time this is called, we have created all the | |
3951 | // output sections except .shstrtab itself. | |
3952 | ||
3953 | Output_section* | |
3954 | Layout::create_shstrtab() | |
3955 | { | |
3956 | // FIXME: We don't need to create a .shstrtab section if we are | |
3957 | // stripping everything. | |
3958 | ||
cfd73a4e | 3959 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 3960 | |
f5c870d2 | 3961 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0, |
22f0da72 | 3962 | ORDER_INVALID, false); |
75f65a3e | 3963 | |
0e0d5469 ILT |
3964 | if (strcmp(parameters->options().compress_debug_sections(), "none") != 0) |
3965 | { | |
3966 | // We can't write out this section until we've set all the | |
3967 | // section names, and we don't set the names of compressed | |
3968 | // output sections until relocations are complete. FIXME: With | |
3969 | // the current names we use, this is unnecessary. | |
3970 | os->set_after_input_sections(); | |
3971 | } | |
27bc2bce | 3972 | |
a3ad94ed ILT |
3973 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
3974 | os->add_output_section_data(posd); | |
75f65a3e ILT |
3975 | |
3976 | return os; | |
3977 | } | |
3978 | ||
3979 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
3980 | // offset. | |
3981 | ||
27bc2bce | 3982 | void |
d491d34e | 3983 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
75f65a3e ILT |
3984 | { |
3985 | Output_section_headers* oshdrs; | |
9025d29d | 3986 | oshdrs = new Output_section_headers(this, |
16649710 | 3987 | &this->segment_list_, |
6a74a719 | 3988 | &this->section_list_, |
16649710 | 3989 | &this->unattached_section_list_, |
d491d34e ILT |
3990 | &this->namepool_, |
3991 | shstrtab_section); | |
cdc29364 CC |
3992 | off_t off; |
3993 | if (!parameters->incremental_update()) | |
3994 | off = align_address(*poff, oshdrs->addralign()); | |
3995 | else | |
3996 | { | |
3997 | oshdrs->pre_finalize_data_size(); | |
3998 | off = this->allocate(oshdrs->data_size(), oshdrs->addralign(), *poff); | |
3999 | if (off == -1) | |
e6455dfb CC |
4000 | gold_fallback(_("out of patch space for section header table; " |
4001 | "relink with --incremental-full")); | |
cdc29364 CC |
4002 | gold_debug(DEBUG_INCREMENTAL, |
4003 | "create_shdrs: %08lx %08lx (section header table)", | |
4004 | static_cast<long>(off), | |
4005 | static_cast<long>(off + oshdrs->data_size())); | |
4006 | } | |
27bc2bce | 4007 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 | 4008 | off += oshdrs->data_size(); |
cdc29364 CC |
4009 | if (off > *poff) |
4010 | *poff = off; | |
27bc2bce | 4011 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
4012 | } |
4013 | ||
d491d34e ILT |
4014 | // Count the allocated sections. |
4015 | ||
4016 | size_t | |
4017 | Layout::allocated_output_section_count() const | |
4018 | { | |
4019 | size_t section_count = 0; | |
4020 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4021 | p != this->segment_list_.end(); | |
4022 | ++p) | |
4023 | section_count += (*p)->output_section_count(); | |
4024 | return section_count; | |
4025 | } | |
4026 | ||
dbe717ef ILT |
4027 | // Create the dynamic symbol table. |
4028 | ||
4029 | void | |
7bf1f802 | 4030 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
2e702c99 | 4031 | Symbol_table* symtab, |
ca09d69a | 4032 | Output_section** pdynstr, |
14b31740 ILT |
4033 | unsigned int* plocal_dynamic_count, |
4034 | std::vector<Symbol*>* pdynamic_symbols, | |
4035 | Versions* pversions) | |
dbe717ef | 4036 | { |
a3ad94ed ILT |
4037 | // Count all the symbols in the dynamic symbol table, and set the |
4038 | // dynamic symbol indexes. | |
dbe717ef | 4039 | |
a3ad94ed ILT |
4040 | // Skip symbol 0, which is always all zeroes. |
4041 | unsigned int index = 1; | |
dbe717ef | 4042 | |
a3ad94ed ILT |
4043 | // Add STT_SECTION symbols for each Output section which needs one. |
4044 | for (Section_list::iterator p = this->section_list_.begin(); | |
4045 | p != this->section_list_.end(); | |
4046 | ++p) | |
4047 | { | |
4048 | if (!(*p)->needs_dynsym_index()) | |
4049 | (*p)->set_dynsym_index(-1U); | |
4050 | else | |
4051 | { | |
4052 | (*p)->set_dynsym_index(index); | |
4053 | ++index; | |
4054 | } | |
4055 | } | |
4056 | ||
7bf1f802 ILT |
4057 | // Count the local symbols that need to go in the dynamic symbol table, |
4058 | // and set the dynamic symbol indexes. | |
4059 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
4060 | p != input_objects->relobj_end(); | |
4061 | ++p) | |
4062 | { | |
4063 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
4064 | index = new_index; | |
4065 | } | |
a3ad94ed ILT |
4066 | |
4067 | unsigned int local_symcount = index; | |
14b31740 | 4068 | *plocal_dynamic_count = local_symcount; |
a3ad94ed | 4069 | |
9b07f471 | 4070 | index = symtab->set_dynsym_indexes(index, pdynamic_symbols, |
35cdfc9a | 4071 | &this->dynpool_, pversions); |
a3ad94ed ILT |
4072 | |
4073 | int symsize; | |
4074 | unsigned int align; | |
8851ecca | 4075 | const int size = parameters->target().get_size(); |
a3ad94ed ILT |
4076 | if (size == 32) |
4077 | { | |
4078 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
4079 | align = 4; | |
4080 | } | |
4081 | else if (size == 64) | |
4082 | { | |
4083 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
4084 | align = 8; | |
4085 | } | |
4086 | else | |
4087 | gold_unreachable(); | |
4088 | ||
14b31740 ILT |
4089 | // Create the dynamic symbol table section. |
4090 | ||
3802b2dd ILT |
4091 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
4092 | elfcpp::SHT_DYNSYM, | |
4093 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
4094 | false, |
4095 | ORDER_DYNAMIC_LINKER, | |
4096 | false); | |
a3ad94ed | 4097 | |
6daf5215 ILT |
4098 | // Check for NULL as a linker script may discard .dynsym. |
4099 | if (dynsym != NULL) | |
4100 | { | |
4101 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, | |
4102 | align, | |
4103 | "** dynsym"); | |
4104 | dynsym->add_output_section_data(odata); | |
a3ad94ed | 4105 | |
6daf5215 ILT |
4106 | dynsym->set_info(local_symcount); |
4107 | dynsym->set_entsize(symsize); | |
4108 | dynsym->set_addralign(align); | |
a3ad94ed | 4109 | |
6daf5215 ILT |
4110 | this->dynsym_section_ = dynsym; |
4111 | } | |
a3ad94ed | 4112 | |
16649710 | 4113 | Output_data_dynamic* const odyn = this->dynamic_data_; |
6daf5215 ILT |
4114 | if (odyn != NULL) |
4115 | { | |
4116 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); | |
4117 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
4118 | } | |
a3ad94ed | 4119 | |
d491d34e ILT |
4120 | // If there are more than SHN_LORESERVE allocated sections, we |
4121 | // create a .dynsym_shndx section. It is possible that we don't | |
4122 | // need one, because it is possible that there are no dynamic | |
4123 | // symbols in any of the sections with indexes larger than | |
4124 | // SHN_LORESERVE. This is probably unusual, though, and at this | |
4125 | // time we don't know the actual section indexes so it is | |
4126 | // inconvenient to check. | |
4127 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) | |
4128 | { | |
2ea97941 | 4129 | Output_section* dynsym_xindex = |
d491d34e ILT |
4130 | this->choose_output_section(NULL, ".dynsym_shndx", |
4131 | elfcpp::SHT_SYMTAB_SHNDX, | |
4132 | elfcpp::SHF_ALLOC, | |
22f0da72 | 4133 | false, ORDER_DYNAMIC_LINKER, false); |
d491d34e | 4134 | |
6daf5215 ILT |
4135 | if (dynsym_xindex != NULL) |
4136 | { | |
4137 | this->dynsym_xindex_ = new Output_symtab_xindex(index); | |
d491d34e | 4138 | |
6daf5215 | 4139 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); |
d491d34e | 4140 | |
6daf5215 ILT |
4141 | dynsym_xindex->set_link_section(dynsym); |
4142 | dynsym_xindex->set_addralign(4); | |
4143 | dynsym_xindex->set_entsize(4); | |
d491d34e | 4144 | |
6daf5215 | 4145 | dynsym_xindex->set_after_input_sections(); |
d491d34e | 4146 | |
6daf5215 ILT |
4147 | // This tells the driver code to wait until the symbol table |
4148 | // has written out before writing out the postprocessing | |
4149 | // sections, including the .dynsym_shndx section. | |
4150 | this->any_postprocessing_sections_ = true; | |
4151 | } | |
d491d34e ILT |
4152 | } |
4153 | ||
14b31740 ILT |
4154 | // Create the dynamic string table section. |
4155 | ||
3802b2dd ILT |
4156 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
4157 | elfcpp::SHT_STRTAB, | |
4158 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
4159 | false, |
4160 | ORDER_DYNAMIC_LINKER, | |
4161 | false); | |
117be58f | 4162 | *pdynstr = dynstr; |
6daf5215 ILT |
4163 | if (dynstr != NULL) |
4164 | { | |
4165 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
4166 | dynstr->add_output_section_data(strdata); | |
a3ad94ed | 4167 | |
6daf5215 ILT |
4168 | if (dynsym != NULL) |
4169 | dynsym->set_link_section(dynstr); | |
4170 | if (this->dynamic_section_ != NULL) | |
4171 | this->dynamic_section_->set_link_section(dynstr); | |
16649710 | 4172 | |
6daf5215 ILT |
4173 | if (odyn != NULL) |
4174 | { | |
4175 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); | |
4176 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
4177 | } | |
6daf5215 | 4178 | } |
14b31740 ILT |
4179 | |
4180 | // Create the hash tables. | |
4181 | ||
13670ee6 ILT |
4182 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
4183 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
4184 | { | |
4185 | unsigned char* phash; | |
4186 | unsigned int hashlen; | |
4187 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, | |
4188 | &phash, &hashlen); | |
4189 | ||
22f0da72 ILT |
4190 | Output_section* hashsec = |
4191 | this->choose_output_section(NULL, ".hash", elfcpp::SHT_HASH, | |
4192 | elfcpp::SHF_ALLOC, false, | |
4193 | ORDER_DYNAMIC_LINKER, false); | |
13670ee6 ILT |
4194 | |
4195 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
4196 | hashlen, | |
7d9e3d98 ILT |
4197 | align, |
4198 | "** hash"); | |
6daf5215 ILT |
4199 | if (hashsec != NULL && hashdata != NULL) |
4200 | hashsec->add_output_section_data(hashdata); | |
13670ee6 | 4201 | |
6daf5215 ILT |
4202 | if (hashsec != NULL) |
4203 | { | |
4204 | if (dynsym != NULL) | |
4205 | hashsec->set_link_section(dynsym); | |
4206 | hashsec->set_entsize(4); | |
4207 | } | |
a3ad94ed | 4208 | |
6daf5215 ILT |
4209 | if (odyn != NULL) |
4210 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); | |
13670ee6 ILT |
4211 | } |
4212 | ||
4213 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 | |
4214 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
4215 | { | |
4216 | unsigned char* phash; | |
4217 | unsigned int hashlen; | |
4218 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, local_symcount, | |
4219 | &phash, &hashlen); | |
a3ad94ed | 4220 | |
22f0da72 ILT |
4221 | Output_section* hashsec = |
4222 | this->choose_output_section(NULL, ".gnu.hash", elfcpp::SHT_GNU_HASH, | |
4223 | elfcpp::SHF_ALLOC, false, | |
4224 | ORDER_DYNAMIC_LINKER, false); | |
a3ad94ed | 4225 | |
13670ee6 ILT |
4226 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
4227 | hashlen, | |
7d9e3d98 ILT |
4228 | align, |
4229 | "** hash"); | |
6daf5215 ILT |
4230 | if (hashsec != NULL && hashdata != NULL) |
4231 | hashsec->add_output_section_data(hashdata); | |
a3ad94ed | 4232 | |
6daf5215 ILT |
4233 | if (hashsec != NULL) |
4234 | { | |
4235 | if (dynsym != NULL) | |
4236 | hashsec->set_link_section(dynsym); | |
1b81fb71 | 4237 | |
6daf5215 ILT |
4238 | // For a 64-bit target, the entries in .gnu.hash do not have |
4239 | // a uniform size, so we only set the entry size for a | |
4240 | // 32-bit target. | |
4241 | if (parameters->target().get_size() == 32) | |
4242 | hashsec->set_entsize(4); | |
a3ad94ed | 4243 | |
6daf5215 ILT |
4244 | if (odyn != NULL) |
4245 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); | |
4246 | } | |
13670ee6 | 4247 | } |
dbe717ef ILT |
4248 | } |
4249 | ||
7bf1f802 ILT |
4250 | // Assign offsets to each local portion of the dynamic symbol table. |
4251 | ||
4252 | void | |
4253 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
4254 | { | |
4255 | Output_section* dynsym = this->dynsym_section_; | |
6daf5215 ILT |
4256 | if (dynsym == NULL) |
4257 | return; | |
7bf1f802 ILT |
4258 | |
4259 | off_t off = dynsym->offset(); | |
4260 | ||
4261 | // Skip the dummy symbol at the start of the section. | |
4262 | off += dynsym->entsize(); | |
4263 | ||
4264 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
4265 | p != input_objects->relobj_end(); | |
4266 | ++p) | |
4267 | { | |
4268 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
4269 | off += count * dynsym->entsize(); | |
4270 | } | |
4271 | } | |
4272 | ||
14b31740 ILT |
4273 | // Create the version sections. |
4274 | ||
4275 | void | |
9025d29d | 4276 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 4277 | const Symbol_table* symtab, |
14b31740 ILT |
4278 | unsigned int local_symcount, |
4279 | const std::vector<Symbol*>& dynamic_symbols, | |
4280 | const Output_section* dynstr) | |
4281 | { | |
4282 | if (!versions->any_defs() && !versions->any_needs()) | |
4283 | return; | |
4284 | ||
8851ecca | 4285 | switch (parameters->size_and_endianness()) |
14b31740 | 4286 | { |
193a53d9 | 4287 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 4288 | case Parameters::TARGET_32_LITTLE: |
7d1a9ebb ILT |
4289 | this->sized_create_version_sections<32, false>(versions, symtab, |
4290 | local_symcount, | |
4291 | dynamic_symbols, dynstr); | |
8851ecca | 4292 | break; |
193a53d9 | 4293 | #endif |
8851ecca ILT |
4294 | #ifdef HAVE_TARGET_32_BIG |
4295 | case Parameters::TARGET_32_BIG: | |
7d1a9ebb ILT |
4296 | this->sized_create_version_sections<32, true>(versions, symtab, |
4297 | local_symcount, | |
4298 | dynamic_symbols, dynstr); | |
8851ecca | 4299 | break; |
193a53d9 | 4300 | #endif |
193a53d9 | 4301 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 4302 | case Parameters::TARGET_64_LITTLE: |
7d1a9ebb ILT |
4303 | this->sized_create_version_sections<64, false>(versions, symtab, |
4304 | local_symcount, | |
4305 | dynamic_symbols, dynstr); | |
8851ecca | 4306 | break; |
193a53d9 | 4307 | #endif |
8851ecca ILT |
4308 | #ifdef HAVE_TARGET_64_BIG |
4309 | case Parameters::TARGET_64_BIG: | |
7d1a9ebb ILT |
4310 | this->sized_create_version_sections<64, true>(versions, symtab, |
4311 | local_symcount, | |
4312 | dynamic_symbols, dynstr); | |
8851ecca ILT |
4313 | break; |
4314 | #endif | |
4315 | default: | |
4316 | gold_unreachable(); | |
14b31740 | 4317 | } |
14b31740 ILT |
4318 | } |
4319 | ||
4320 | // Create the version sections, sized version. | |
4321 | ||
4322 | template<int size, bool big_endian> | |
4323 | void | |
4324 | Layout::sized_create_version_sections( | |
4325 | const Versions* versions, | |
46fe1623 | 4326 | const Symbol_table* symtab, |
14b31740 ILT |
4327 | unsigned int local_symcount, |
4328 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 4329 | const Output_section* dynstr) |
14b31740 | 4330 | { |
3802b2dd ILT |
4331 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
4332 | elfcpp::SHT_GNU_versym, | |
4333 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
4334 | false, |
4335 | ORDER_DYNAMIC_LINKER, | |
4336 | false); | |
14b31740 | 4337 | |
6daf5215 ILT |
4338 | // Check for NULL since a linker script may discard this section. |
4339 | if (vsec != NULL) | |
4340 | { | |
4341 | unsigned char* vbuf; | |
4342 | unsigned int vsize; | |
4343 | versions->symbol_section_contents<size, big_endian>(symtab, | |
4344 | &this->dynpool_, | |
4345 | local_symcount, | |
4346 | dynamic_symbols, | |
4347 | &vbuf, &vsize); | |
4348 | ||
4349 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, | |
4350 | "** versions"); | |
4351 | ||
4352 | vsec->add_output_section_data(vdata); | |
4353 | vsec->set_entsize(2); | |
4354 | vsec->set_link_section(this->dynsym_section_); | |
4355 | } | |
14b31740 ILT |
4356 | |
4357 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
6daf5215 ILT |
4358 | if (odyn != NULL && vsec != NULL) |
4359 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
14b31740 ILT |
4360 | |
4361 | if (versions->any_defs()) | |
4362 | { | |
3802b2dd | 4363 | Output_section* vdsec; |
6daf5215 ILT |
4364 | vdsec = this->choose_output_section(NULL, ".gnu.version_d", |
4365 | elfcpp::SHT_GNU_verdef, | |
4366 | elfcpp::SHF_ALLOC, | |
4367 | false, ORDER_DYNAMIC_LINKER, false); | |
4368 | ||
4369 | if (vdsec != NULL) | |
4370 | { | |
4371 | unsigned char* vdbuf; | |
4372 | unsigned int vdsize; | |
4373 | unsigned int vdentries; | |
4374 | versions->def_section_contents<size, big_endian>(&this->dynpool_, | |
4375 | &vdbuf, &vdsize, | |
4376 | &vdentries); | |
4377 | ||
4378 | Output_section_data* vddata = | |
4379 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); | |
4380 | ||
4381 | vdsec->add_output_section_data(vddata); | |
4382 | vdsec->set_link_section(dynstr); | |
4383 | vdsec->set_info(vdentries); | |
4384 | ||
4385 | if (odyn != NULL) | |
4386 | { | |
4387 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
4388 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
4389 | } | |
4390 | } | |
14b31740 ILT |
4391 | } |
4392 | ||
4393 | if (versions->any_needs()) | |
4394 | { | |
14b31740 | 4395 | Output_section* vnsec; |
3802b2dd ILT |
4396 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
4397 | elfcpp::SHT_GNU_verneed, | |
4398 | elfcpp::SHF_ALLOC, | |
22f0da72 | 4399 | false, ORDER_DYNAMIC_LINKER, false); |
14b31740 | 4400 | |
6daf5215 ILT |
4401 | if (vnsec != NULL) |
4402 | { | |
4403 | unsigned char* vnbuf; | |
4404 | unsigned int vnsize; | |
4405 | unsigned int vnentries; | |
4406 | versions->need_section_contents<size, big_endian>(&this->dynpool_, | |
4407 | &vnbuf, &vnsize, | |
4408 | &vnentries); | |
14b31740 | 4409 | |
6daf5215 ILT |
4410 | Output_section_data* vndata = |
4411 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); | |
14b31740 | 4412 | |
6daf5215 ILT |
4413 | vnsec->add_output_section_data(vndata); |
4414 | vnsec->set_link_section(dynstr); | |
4415 | vnsec->set_info(vnentries); | |
14b31740 | 4416 | |
6daf5215 ILT |
4417 | if (odyn != NULL) |
4418 | { | |
4419 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
4420 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
4421 | } | |
4422 | } | |
14b31740 ILT |
4423 | } |
4424 | } | |
4425 | ||
dbe717ef ILT |
4426 | // Create the .interp section and PT_INTERP segment. |
4427 | ||
4428 | void | |
4429 | Layout::create_interp(const Target* target) | |
4430 | { | |
10b4f102 ILT |
4431 | gold_assert(this->interp_segment_ == NULL); |
4432 | ||
e55bde5e | 4433 | const char* interp = parameters->options().dynamic_linker(); |
dbe717ef ILT |
4434 | if (interp == NULL) |
4435 | { | |
4436 | interp = target->dynamic_linker(); | |
a3ad94ed | 4437 | gold_assert(interp != NULL); |
dbe717ef ILT |
4438 | } |
4439 | ||
4440 | size_t len = strlen(interp) + 1; | |
4441 | ||
4442 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
4443 | ||
e1f74f98 ILT |
4444 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
4445 | elfcpp::SHT_PROGBITS, | |
4446 | elfcpp::SHF_ALLOC, | |
4447 | false, ORDER_INTERP, | |
4448 | false); | |
6daf5215 ILT |
4449 | if (osec != NULL) |
4450 | osec->add_output_section_data(odata); | |
dbe717ef ILT |
4451 | } |
4452 | ||
ea715a34 ILT |
4453 | // Add dynamic tags for the PLT and the dynamic relocs. This is |
4454 | // called by the target-specific code. This does nothing if not doing | |
4455 | // a dynamic link. | |
4456 | ||
4457 | // USE_REL is true for REL relocs rather than RELA relocs. | |
4458 | ||
4459 | // If PLT_GOT is not NULL, then DT_PLTGOT points to it. | |
4460 | ||
4461 | // If PLT_REL is not NULL, it is used for DT_PLTRELSZ, and DT_JMPREL, | |
e291e7b9 ILT |
4462 | // and we also set DT_PLTREL. We use PLT_REL's output section, since |
4463 | // some targets have multiple reloc sections in PLT_REL. | |
ea715a34 ILT |
4464 | |
4465 | // If DYN_REL is not NULL, it is used for DT_REL/DT_RELA, | |
67181c72 ILT |
4466 | // DT_RELSZ/DT_RELASZ, DT_RELENT/DT_RELAENT. Again we use the output |
4467 | // section. | |
ea715a34 ILT |
4468 | |
4469 | // If ADD_DEBUG is true, we add a DT_DEBUG entry when generating an | |
4470 | // executable. | |
4471 | ||
4472 | void | |
4473 | Layout::add_target_dynamic_tags(bool use_rel, const Output_data* plt_got, | |
4474 | const Output_data* plt_rel, | |
3a44184e | 4475 | const Output_data_reloc_generic* dyn_rel, |
612a8d3d | 4476 | bool add_debug, bool dynrel_includes_plt) |
ea715a34 ILT |
4477 | { |
4478 | Output_data_dynamic* odyn = this->dynamic_data_; | |
4479 | if (odyn == NULL) | |
4480 | return; | |
4481 | ||
4482 | if (plt_got != NULL && plt_got->output_section() != NULL) | |
4483 | odyn->add_section_address(elfcpp::DT_PLTGOT, plt_got); | |
4484 | ||
4485 | if (plt_rel != NULL && plt_rel->output_section() != NULL) | |
4486 | { | |
e291e7b9 ILT |
4487 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, plt_rel->output_section()); |
4488 | odyn->add_section_address(elfcpp::DT_JMPREL, plt_rel->output_section()); | |
ea715a34 ILT |
4489 | odyn->add_constant(elfcpp::DT_PLTREL, |
4490 | use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA); | |
4491 | } | |
4492 | ||
82435b3b ILT |
4493 | if ((dyn_rel != NULL && dyn_rel->output_section() != NULL) |
4494 | || (dynrel_includes_plt | |
4495 | && plt_rel != NULL | |
4496 | && plt_rel->output_section() != NULL)) | |
ea715a34 | 4497 | { |
82435b3b ILT |
4498 | bool have_dyn_rel = dyn_rel != NULL && dyn_rel->output_section() != NULL; |
4499 | bool have_plt_rel = plt_rel != NULL && plt_rel->output_section() != NULL; | |
ea715a34 | 4500 | odyn->add_section_address(use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA, |
82435b3b ILT |
4501 | (have_dyn_rel |
4502 | ? dyn_rel->output_section() | |
4503 | : plt_rel->output_section())); | |
4504 | elfcpp::DT size_tag = use_rel ? elfcpp::DT_RELSZ : elfcpp::DT_RELASZ; | |
4505 | if (have_dyn_rel && have_plt_rel && dynrel_includes_plt) | |
4506 | odyn->add_section_size(size_tag, | |
67181c72 ILT |
4507 | dyn_rel->output_section(), |
4508 | plt_rel->output_section()); | |
82435b3b ILT |
4509 | else if (have_dyn_rel) |
4510 | odyn->add_section_size(size_tag, dyn_rel->output_section()); | |
612a8d3d | 4511 | else |
82435b3b | 4512 | odyn->add_section_size(size_tag, plt_rel->output_section()); |
ea715a34 ILT |
4513 | const int size = parameters->target().get_size(); |
4514 | elfcpp::DT rel_tag; | |
4515 | int rel_size; | |
4516 | if (use_rel) | |
4517 | { | |
4518 | rel_tag = elfcpp::DT_RELENT; | |
4519 | if (size == 32) | |
4520 | rel_size = Reloc_types<elfcpp::SHT_REL, 32, false>::reloc_size; | |
4521 | else if (size == 64) | |
4522 | rel_size = Reloc_types<elfcpp::SHT_REL, 64, false>::reloc_size; | |
4523 | else | |
4524 | gold_unreachable(); | |
4525 | } | |
4526 | else | |
4527 | { | |
4528 | rel_tag = elfcpp::DT_RELAENT; | |
4529 | if (size == 32) | |
4530 | rel_size = Reloc_types<elfcpp::SHT_RELA, 32, false>::reloc_size; | |
4531 | else if (size == 64) | |
4532 | rel_size = Reloc_types<elfcpp::SHT_RELA, 64, false>::reloc_size; | |
4533 | else | |
4534 | gold_unreachable(); | |
4535 | } | |
4536 | odyn->add_constant(rel_tag, rel_size); | |
3a44184e | 4537 | |
82435b3b | 4538 | if (parameters->options().combreloc() && have_dyn_rel) |
3a44184e ILT |
4539 | { |
4540 | size_t c = dyn_rel->relative_reloc_count(); | |
4541 | if (c > 0) | |
4542 | odyn->add_constant((use_rel | |
4543 | ? elfcpp::DT_RELCOUNT | |
4544 | : elfcpp::DT_RELACOUNT), | |
4545 | c); | |
4546 | } | |
ea715a34 ILT |
4547 | } |
4548 | ||
4549 | if (add_debug && !parameters->options().shared()) | |
4550 | { | |
4551 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
4552 | // linker at run time, and used by the debugger. | |
4553 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
4554 | } | |
4555 | } | |
4556 | ||
a3ad94ed ILT |
4557 | // Finish the .dynamic section and PT_DYNAMIC segment. |
4558 | ||
4559 | void | |
4560 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 4561 | const Symbol_table* symtab) |
a3ad94ed | 4562 | { |
6daf5215 ILT |
4563 | if (!this->script_options_->saw_phdrs_clause() |
4564 | && this->dynamic_section_ != NULL) | |
1c4f3631 ILT |
4565 | { |
4566 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, | |
4567 | (elfcpp::PF_R | |
4568 | | elfcpp::PF_W)); | |
22f0da72 ILT |
4569 | oseg->add_output_section_to_nonload(this->dynamic_section_, |
4570 | elfcpp::PF_R | elfcpp::PF_W); | |
1c4f3631 | 4571 | } |
a3ad94ed | 4572 | |
16649710 | 4573 | Output_data_dynamic* const odyn = this->dynamic_data_; |
6daf5215 ILT |
4574 | if (odyn == NULL) |
4575 | return; | |
16649710 | 4576 | |
a3ad94ed ILT |
4577 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
4578 | p != input_objects->dynobj_end(); | |
4579 | ++p) | |
4580 | { | |
0f1c85a6 | 4581 | if (!(*p)->is_needed() && (*p)->as_needed()) |
594c8e5e ILT |
4582 | { |
4583 | // This dynamic object was linked with --as-needed, but it | |
4584 | // is not needed. | |
4585 | continue; | |
4586 | } | |
4587 | ||
a3ad94ed ILT |
4588 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); |
4589 | } | |
4590 | ||
8851ecca | 4591 | if (parameters->options().shared()) |
fced7afd | 4592 | { |
e55bde5e | 4593 | const char* soname = parameters->options().soname(); |
fced7afd ILT |
4594 | if (soname != NULL) |
4595 | odyn->add_string(elfcpp::DT_SONAME, soname); | |
4596 | } | |
4597 | ||
c6585162 | 4598 | Symbol* sym = symtab->lookup(parameters->options().init()); |
14b31740 | 4599 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
4600 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
4601 | ||
c6585162 | 4602 | sym = symtab->lookup(parameters->options().fini()); |
14b31740 | 4603 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
4604 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
4605 | ||
f15f61a7 DK |
4606 | // Look for .init_array, .preinit_array and .fini_array by checking |
4607 | // section types. | |
4608 | for(Layout::Section_list::const_iterator p = this->section_list_.begin(); | |
4609 | p != this->section_list_.end(); | |
4610 | ++p) | |
4611 | switch((*p)->type()) | |
4612 | { | |
4613 | case elfcpp::SHT_FINI_ARRAY: | |
4614 | odyn->add_section_address(elfcpp::DT_FINI_ARRAY, *p); | |
2e702c99 | 4615 | odyn->add_section_size(elfcpp::DT_FINI_ARRAYSZ, *p); |
f15f61a7 DK |
4616 | break; |
4617 | case elfcpp::SHT_INIT_ARRAY: | |
4618 | odyn->add_section_address(elfcpp::DT_INIT_ARRAY, *p); | |
2e702c99 | 4619 | odyn->add_section_size(elfcpp::DT_INIT_ARRAYSZ, *p); |
f15f61a7 DK |
4620 | break; |
4621 | case elfcpp::SHT_PREINIT_ARRAY: | |
4622 | odyn->add_section_address(elfcpp::DT_PREINIT_ARRAY, *p); | |
2e702c99 | 4623 | odyn->add_section_size(elfcpp::DT_PREINIT_ARRAYSZ, *p); |
f15f61a7 DK |
4624 | break; |
4625 | default: | |
4626 | break; | |
4627 | } | |
2e702c99 | 4628 | |
41f542e7 | 4629 | // Add a DT_RPATH entry if needed. |
e55bde5e | 4630 | const General_options::Dir_list& rpath(parameters->options().rpath()); |
41f542e7 ILT |
4631 | if (!rpath.empty()) |
4632 | { | |
4633 | std::string rpath_val; | |
4634 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
2e702c99 RM |
4635 | p != rpath.end(); |
4636 | ++p) | |
4637 | { | |
4638 | if (rpath_val.empty()) | |
4639 | rpath_val = p->name(); | |
4640 | else | |
4641 | { | |
4642 | // Eliminate duplicates. | |
4643 | General_options::Dir_list::const_iterator q; | |
4644 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 4645 | if (q->name() == p->name()) |
2e702c99 RM |
4646 | break; |
4647 | if (q == p) | |
4648 | { | |
4649 | rpath_val += ':'; | |
4650 | rpath_val += p->name(); | |
4651 | } | |
4652 | } | |
4653 | } | |
41f542e7 | 4654 | |
b1b00fcc MF |
4655 | if (!parameters->options().enable_new_dtags()) |
4656 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
4657 | else | |
7c414435 | 4658 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); |
41f542e7 | 4659 | } |
4f4c5f80 ILT |
4660 | |
4661 | // Look for text segments that have dynamic relocations. | |
4662 | bool have_textrel = false; | |
4e8fe71f | 4663 | if (!this->script_options_->saw_sections_clause()) |
4f4c5f80 | 4664 | { |
4e8fe71f | 4665 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
2e702c99 RM |
4666 | p != this->segment_list_.end(); |
4667 | ++p) | |
4668 | { | |
4669 | if ((*p)->type() == elfcpp::PT_LOAD | |
766f91bb | 4670 | && ((*p)->flags() & elfcpp::PF_W) == 0 |
2e702c99 RM |
4671 | && (*p)->has_dynamic_reloc()) |
4672 | { | |
4673 | have_textrel = true; | |
4674 | break; | |
4675 | } | |
4676 | } | |
4e8fe71f ILT |
4677 | } |
4678 | else | |
4679 | { | |
4680 | // We don't know the section -> segment mapping, so we are | |
4681 | // conservative and just look for readonly sections with | |
4682 | // relocations. If those sections wind up in writable segments, | |
4683 | // then we have created an unnecessary DT_TEXTREL entry. | |
4684 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
2e702c99 RM |
4685 | p != this->section_list_.end(); |
4686 | ++p) | |
4687 | { | |
4688 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 | |
4689 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 | |
4690 | && (*p)->has_dynamic_reloc()) | |
4691 | { | |
4692 | have_textrel = true; | |
4693 | break; | |
4694 | } | |
4695 | } | |
4f4c5f80 ILT |
4696 | } |
4697 | ||
886288f1 ILT |
4698 | if (parameters->options().filter() != NULL) |
4699 | odyn->add_string(elfcpp::DT_FILTER, parameters->options().filter()); | |
4700 | if (parameters->options().any_auxiliary()) | |
4701 | { | |
4702 | for (options::String_set::const_iterator p = | |
4703 | parameters->options().auxiliary_begin(); | |
4704 | p != parameters->options().auxiliary_end(); | |
4705 | ++p) | |
4706 | odyn->add_string(elfcpp::DT_AUXILIARY, *p); | |
4707 | } | |
4708 | ||
4709 | // Add a DT_FLAGS entry if necessary. | |
4f4c5f80 ILT |
4710 | unsigned int flags = 0; |
4711 | if (have_textrel) | |
6a41d30b ILT |
4712 | { |
4713 | // Add a DT_TEXTREL for compatibility with older loaders. | |
4714 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
4715 | flags |= elfcpp::DF_TEXTREL; | |
b9674e17 | 4716 | |
ffeef7df ILT |
4717 | if (parameters->options().text()) |
4718 | gold_error(_("read-only segment has dynamic relocations")); | |
4719 | else if (parameters->options().warn_shared_textrel() | |
4720 | && parameters->options().shared()) | |
b9674e17 | 4721 | gold_warning(_("shared library text segment is not shareable")); |
6a41d30b | 4722 | } |
8851ecca | 4723 | if (parameters->options().shared() && this->has_static_tls()) |
535890bb | 4724 | flags |= elfcpp::DF_STATIC_TLS; |
7be8330a CD |
4725 | if (parameters->options().origin()) |
4726 | flags |= elfcpp::DF_ORIGIN; | |
f15f61a7 DK |
4727 | if (parameters->options().Bsymbolic()) |
4728 | { | |
4729 | flags |= elfcpp::DF_SYMBOLIC; | |
4730 | // Add DT_SYMBOLIC for compatibility with older loaders. | |
4731 | odyn->add_constant(elfcpp::DT_SYMBOLIC, 0); | |
4732 | } | |
e1c74d60 ILT |
4733 | if (parameters->options().now()) |
4734 | flags |= elfcpp::DF_BIND_NOW; | |
0d212c3a ILT |
4735 | if (flags != 0) |
4736 | odyn->add_constant(elfcpp::DT_FLAGS, flags); | |
7c414435 DM |
4737 | |
4738 | flags = 0; | |
4739 | if (parameters->options().initfirst()) | |
4740 | flags |= elfcpp::DF_1_INITFIRST; | |
4741 | if (parameters->options().interpose()) | |
4742 | flags |= elfcpp::DF_1_INTERPOSE; | |
4743 | if (parameters->options().loadfltr()) | |
4744 | flags |= elfcpp::DF_1_LOADFLTR; | |
4745 | if (parameters->options().nodefaultlib()) | |
4746 | flags |= elfcpp::DF_1_NODEFLIB; | |
4747 | if (parameters->options().nodelete()) | |
4748 | flags |= elfcpp::DF_1_NODELETE; | |
4749 | if (parameters->options().nodlopen()) | |
4750 | flags |= elfcpp::DF_1_NOOPEN; | |
4751 | if (parameters->options().nodump()) | |
4752 | flags |= elfcpp::DF_1_NODUMP; | |
4753 | if (!parameters->options().shared()) | |
4754 | flags &= ~(elfcpp::DF_1_INITFIRST | |
4755 | | elfcpp::DF_1_NODELETE | |
4756 | | elfcpp::DF_1_NOOPEN); | |
7be8330a CD |
4757 | if (parameters->options().origin()) |
4758 | flags |= elfcpp::DF_1_ORIGIN; | |
e1c74d60 ILT |
4759 | if (parameters->options().now()) |
4760 | flags |= elfcpp::DF_1_NOW; | |
e2153196 ILT |
4761 | if (parameters->options().Bgroup()) |
4762 | flags |= elfcpp::DF_1_GROUP; | |
0d212c3a | 4763 | if (flags != 0) |
7c414435 | 4764 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); |
a3ad94ed ILT |
4765 | } |
4766 | ||
f0ba79e2 ILT |
4767 | // Set the size of the _DYNAMIC symbol table to be the size of the |
4768 | // dynamic data. | |
4769 | ||
4770 | void | |
4771 | Layout::set_dynamic_symbol_size(const Symbol_table* symtab) | |
4772 | { | |
4773 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
6daf5215 ILT |
4774 | if (odyn == NULL) |
4775 | return; | |
f0ba79e2 | 4776 | odyn->finalize_data_size(); |
6daf5215 ILT |
4777 | if (this->dynamic_symbol_ == NULL) |
4778 | return; | |
f0ba79e2 ILT |
4779 | off_t data_size = odyn->data_size(); |
4780 | const int size = parameters->target().get_size(); | |
4781 | if (size == 32) | |
4782 | symtab->get_sized_symbol<32>(this->dynamic_symbol_)->set_symsize(data_size); | |
4783 | else if (size == 64) | |
4784 | symtab->get_sized_symbol<64>(this->dynamic_symbol_)->set_symsize(data_size); | |
4785 | else | |
4786 | gold_unreachable(); | |
4787 | } | |
4788 | ||
dff16297 ILT |
4789 | // The mapping of input section name prefixes to output section names. |
4790 | // In some cases one prefix is itself a prefix of another prefix; in | |
4791 | // such a case the longer prefix must come first. These prefixes are | |
4792 | // based on the GNU linker default ELF linker script. | |
a2fb1b05 | 4793 | |
ead1e424 | 4794 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
1be75daa | 4795 | #define MAPPING_INIT_EXACT(f, t) { f, 0, t, sizeof(t) - 1 } |
dff16297 | 4796 | const Layout::Section_name_mapping Layout::section_name_mapping[] = |
a2fb1b05 | 4797 | { |
dff16297 | 4798 | MAPPING_INIT(".text.", ".text"), |
dff16297 | 4799 | MAPPING_INIT(".rodata.", ".rodata"), |
9b689de0 | 4800 | MAPPING_INIT(".data.rel.ro.local.", ".data.rel.ro.local"), |
1be75daa | 4801 | MAPPING_INIT_EXACT(".data.rel.ro.local", ".data.rel.ro.local"), |
9b689de0 | 4802 | MAPPING_INIT(".data.rel.ro.", ".data.rel.ro"), |
1be75daa | 4803 | MAPPING_INIT_EXACT(".data.rel.ro", ".data.rel.ro"), |
dff16297 ILT |
4804 | MAPPING_INIT(".data.", ".data"), |
4805 | MAPPING_INIT(".bss.", ".bss"), | |
4806 | MAPPING_INIT(".tdata.", ".tdata"), | |
4807 | MAPPING_INIT(".tbss.", ".tbss"), | |
4808 | MAPPING_INIT(".init_array.", ".init_array"), | |
4809 | MAPPING_INIT(".fini_array.", ".fini_array"), | |
4810 | MAPPING_INIT(".sdata.", ".sdata"), | |
4811 | MAPPING_INIT(".sbss.", ".sbss"), | |
4812 | // FIXME: In the GNU linker, .sbss2 and .sdata2 are handled | |
4813 | // differently depending on whether it is creating a shared library. | |
4814 | MAPPING_INIT(".sdata2.", ".sdata"), | |
4815 | MAPPING_INIT(".sbss2.", ".sbss"), | |
4816 | MAPPING_INIT(".lrodata.", ".lrodata"), | |
4817 | MAPPING_INIT(".ldata.", ".ldata"), | |
4818 | MAPPING_INIT(".lbss.", ".lbss"), | |
4819 | MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"), | |
4820 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"), | |
4821 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"), | |
4822 | MAPPING_INIT(".gnu.linkonce.t.", ".text"), | |
4823 | MAPPING_INIT(".gnu.linkonce.r.", ".rodata"), | |
4824 | MAPPING_INIT(".gnu.linkonce.d.", ".data"), | |
4825 | MAPPING_INIT(".gnu.linkonce.b.", ".bss"), | |
4826 | MAPPING_INIT(".gnu.linkonce.s.", ".sdata"), | |
4827 | MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"), | |
4828 | MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"), | |
4829 | MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"), | |
4830 | MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"), | |
4831 | MAPPING_INIT(".gnu.linkonce.td.", ".tdata"), | |
4832 | MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"), | |
4833 | MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"), | |
4834 | MAPPING_INIT(".gnu.linkonce.l.", ".ldata"), | |
4835 | MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"), | |
4a54abbb | 4836 | MAPPING_INIT(".ARM.extab", ".ARM.extab"), |
1dcd334d | 4837 | MAPPING_INIT(".gnu.linkonce.armextab.", ".ARM.extab"), |
4a54abbb | 4838 | MAPPING_INIT(".ARM.exidx", ".ARM.exidx"), |
1dcd334d | 4839 | MAPPING_INIT(".gnu.linkonce.armexidx.", ".ARM.exidx"), |
a2fb1b05 ILT |
4840 | }; |
4841 | #undef MAPPING_INIT | |
1be75daa | 4842 | #undef MAPPING_INIT_EXACT |
a2fb1b05 | 4843 | |
dff16297 ILT |
4844 | const int Layout::section_name_mapping_count = |
4845 | (sizeof(Layout::section_name_mapping) | |
4846 | / sizeof(Layout::section_name_mapping[0])); | |
a2fb1b05 | 4847 | |
ead1e424 ILT |
4848 | // Choose the output section name to use given an input section name. |
4849 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
4850 | // length of NAME. | |
4851 | ||
4852 | const char* | |
5393d741 ILT |
4853 | Layout::output_section_name(const Relobj* relobj, const char* name, |
4854 | size_t* plen) | |
ead1e424 | 4855 | { |
af4a8a83 ILT |
4856 | // gcc 4.3 generates the following sorts of section names when it |
4857 | // needs a section name specific to a function: | |
4858 | // .text.FN | |
4859 | // .rodata.FN | |
4860 | // .sdata2.FN | |
4861 | // .data.FN | |
4862 | // .data.rel.FN | |
4863 | // .data.rel.local.FN | |
4864 | // .data.rel.ro.FN | |
4865 | // .data.rel.ro.local.FN | |
4866 | // .sdata.FN | |
4867 | // .bss.FN | |
4868 | // .sbss.FN | |
4869 | // .tdata.FN | |
4870 | // .tbss.FN | |
4871 | ||
4872 | // The GNU linker maps all of those to the part before the .FN, | |
4873 | // except that .data.rel.local.FN is mapped to .data, and | |
4874 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
4875 | // beginning with .data.rel.ro.local are grouped together. | |
4876 | ||
4877 | // For an anonymous namespace, the string FN can contain a '.'. | |
4878 | ||
4879 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
4880 | // GNU linker maps to .rodata. | |
4881 | ||
dff16297 ILT |
4882 | // The .data.rel.ro sections are used with -z relro. The sections |
4883 | // are recognized by name. We use the same names that the GNU | |
4884 | // linker does for these sections. | |
af4a8a83 | 4885 | |
dff16297 ILT |
4886 | // It is hard to handle this in a principled way, so we don't even |
4887 | // try. We use a table of mappings. If the input section name is | |
4888 | // not found in the table, we simply use it as the output section | |
4889 | // name. | |
af4a8a83 | 4890 | |
dff16297 ILT |
4891 | const Section_name_mapping* psnm = section_name_mapping; |
4892 | for (int i = 0; i < section_name_mapping_count; ++i, ++psnm) | |
ead1e424 | 4893 | { |
1be75daa | 4894 | if (psnm->fromlen > 0) |
dff16297 | 4895 | { |
1be75daa CC |
4896 | if (strncmp(name, psnm->from, psnm->fromlen) == 0) |
4897 | { | |
4898 | *plen = psnm->tolen; | |
4899 | return psnm->to; | |
4900 | } | |
4901 | } | |
4902 | else | |
4903 | { | |
4904 | if (strcmp(name, psnm->from) == 0) | |
4905 | { | |
4906 | *plen = psnm->tolen; | |
4907 | return psnm->to; | |
4908 | } | |
dff16297 | 4909 | } |
ead1e424 ILT |
4910 | } |
4911 | ||
5393d741 ILT |
4912 | // As an additional complication, .ctors sections are output in |
4913 | // either .ctors or .init_array sections, and .dtors sections are | |
4914 | // output in either .dtors or .fini_array sections. | |
4915 | if (is_prefix_of(".ctors.", name) || is_prefix_of(".dtors.", name)) | |
4916 | { | |
4917 | if (parameters->options().ctors_in_init_array()) | |
4918 | { | |
4919 | *plen = 11; | |
4920 | return name[1] == 'c' ? ".init_array" : ".fini_array"; | |
4921 | } | |
4922 | else | |
4923 | { | |
4924 | *plen = 6; | |
4925 | return name[1] == 'c' ? ".ctors" : ".dtors"; | |
4926 | } | |
4927 | } | |
4928 | if (parameters->options().ctors_in_init_array() | |
4929 | && (strcmp(name, ".ctors") == 0 || strcmp(name, ".dtors") == 0)) | |
4930 | { | |
4931 | // To make .init_array/.fini_array work with gcc we must exclude | |
4932 | // .ctors and .dtors sections from the crtbegin and crtend | |
4933 | // files. | |
4934 | if (relobj == NULL | |
4935 | || (!Layout::match_file_name(relobj, "crtbegin") | |
4936 | && !Layout::match_file_name(relobj, "crtend"))) | |
4937 | { | |
4938 | *plen = 11; | |
4939 | return name[1] == 'c' ? ".init_array" : ".fini_array"; | |
4940 | } | |
4941 | } | |
4942 | ||
ead1e424 ILT |
4943 | return name; |
4944 | } | |
4945 | ||
5393d741 ILT |
4946 | // Return true if RELOBJ is an input file whose base name matches |
4947 | // FILE_NAME. The base name must have an extension of ".o", and must | |
4948 | // be exactly FILE_NAME.o or FILE_NAME, one character, ".o". This is | |
4949 | // to match crtbegin.o as well as crtbeginS.o without getting confused | |
4950 | // by other possibilities. Overall matching the file name this way is | |
4951 | // a dreadful hack, but the GNU linker does it in order to better | |
4952 | // support gcc, and we need to be compatible. | |
4953 | ||
4954 | bool | |
4955 | Layout::match_file_name(const Relobj* relobj, const char* match) | |
4956 | { | |
4957 | const std::string& file_name(relobj->name()); | |
4958 | const char* base_name = lbasename(file_name.c_str()); | |
4959 | size_t match_len = strlen(match); | |
4960 | if (strncmp(base_name, match, match_len) != 0) | |
4961 | return false; | |
4962 | size_t base_len = strlen(base_name); | |
4963 | if (base_len != match_len + 2 && base_len != match_len + 3) | |
4964 | return false; | |
4965 | return memcmp(base_name + base_len - 2, ".o", 2) == 0; | |
4966 | } | |
4967 | ||
8a4c0b0d ILT |
4968 | // Check if a comdat group or .gnu.linkonce section with the given |
4969 | // NAME is selected for the link. If there is already a section, | |
1ef4d87f ILT |
4970 | // *KEPT_SECTION is set to point to the existing section and the |
4971 | // function returns false. Otherwise, OBJECT, SHNDX, IS_COMDAT, and | |
4972 | // IS_GROUP_NAME are recorded for this NAME in the layout object, | |
4973 | // *KEPT_SECTION is set to the internal copy and the function returns | |
4974 | // true. | |
a2fb1b05 ILT |
4975 | |
4976 | bool | |
e55bde5e | 4977 | Layout::find_or_add_kept_section(const std::string& name, |
1ef4d87f ILT |
4978 | Relobj* object, |
4979 | unsigned int shndx, | |
4980 | bool is_comdat, | |
4981 | bool is_group_name, | |
2e702c99 | 4982 | Kept_section** kept_section) |
a2fb1b05 | 4983 | { |
e55bde5e ILT |
4984 | // It's normal to see a couple of entries here, for the x86 thunk |
4985 | // sections. If we see more than a few, we're linking a C++ | |
4986 | // program, and we resize to get more space to minimize rehashing. | |
4987 | if (this->signatures_.size() > 4 | |
4988 | && !this->resized_signatures_) | |
4989 | { | |
4990 | reserve_unordered_map(&this->signatures_, | |
4991 | this->number_of_input_files_ * 64); | |
4992 | this->resized_signatures_ = true; | |
4993 | } | |
4994 | ||
1ef4d87f ILT |
4995 | Kept_section candidate; |
4996 | std::pair<Signatures::iterator, bool> ins = | |
4997 | this->signatures_.insert(std::make_pair(name, candidate)); | |
a2fb1b05 | 4998 | |
1ef4d87f | 4999 | if (kept_section != NULL) |
8a4c0b0d | 5000 | *kept_section = &ins.first->second; |
a2fb1b05 ILT |
5001 | if (ins.second) |
5002 | { | |
5003 | // This is the first time we've seen this signature. | |
1ef4d87f ILT |
5004 | ins.first->second.set_object(object); |
5005 | ins.first->second.set_shndx(shndx); | |
5006 | if (is_comdat) | |
5007 | ins.first->second.set_is_comdat(); | |
5008 | if (is_group_name) | |
5009 | ins.first->second.set_is_group_name(); | |
a2fb1b05 ILT |
5010 | return true; |
5011 | } | |
5012 | ||
1ef4d87f ILT |
5013 | // We have already seen this signature. |
5014 | ||
5015 | if (ins.first->second.is_group_name()) | |
a2fb1b05 ILT |
5016 | { |
5017 | // We've already seen a real section group with this signature. | |
1ef4d87f ILT |
5018 | // If the kept group is from a plugin object, and we're in the |
5019 | // replacement phase, accept the new one as a replacement. | |
5020 | if (ins.first->second.object() == NULL | |
2e702c99 RM |
5021 | && parameters->options().plugins()->in_replacement_phase()) |
5022 | { | |
1ef4d87f ILT |
5023 | ins.first->second.set_object(object); |
5024 | ins.first->second.set_shndx(shndx); | |
2e702c99 RM |
5025 | return true; |
5026 | } | |
a2fb1b05 ILT |
5027 | return false; |
5028 | } | |
1ef4d87f | 5029 | else if (is_group_name) |
a2fb1b05 ILT |
5030 | { |
5031 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 5032 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 | 5033 | // a section group, and don't include this section group. |
1ef4d87f | 5034 | ins.first->second.set_is_group_name(); |
a2fb1b05 ILT |
5035 | return false; |
5036 | } | |
5037 | else | |
5038 | { | |
5039 | // We've already seen a linkonce section and this is a linkonce | |
5040 | // section. These don't block each other--this may be the same | |
5041 | // symbol name with different section types. | |
5042 | return true; | |
5043 | } | |
5044 | } | |
5045 | ||
a445fddf ILT |
5046 | // Store the allocated sections into the section list. |
5047 | ||
5048 | void | |
2ea97941 | 5049 | Layout::get_allocated_sections(Section_list* section_list) const |
a445fddf ILT |
5050 | { |
5051 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5052 | p != this->section_list_.end(); | |
5053 | ++p) | |
5054 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) | |
2ea97941 | 5055 | section_list->push_back(*p); |
a445fddf ILT |
5056 | } |
5057 | ||
ec661b9d AM |
5058 | // Store the executable sections into the section list. |
5059 | ||
5060 | void | |
5061 | Layout::get_executable_sections(Section_list* section_list) const | |
5062 | { | |
5063 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5064 | p != this->section_list_.end(); | |
5065 | ++p) | |
5066 | if (((*p)->flags() & (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) | |
5067 | == (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) | |
5068 | section_list->push_back(*p); | |
5069 | } | |
5070 | ||
a445fddf ILT |
5071 | // Create an output segment. |
5072 | ||
5073 | Output_segment* | |
5074 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
5075 | { | |
8851ecca | 5076 | gold_assert(!parameters->options().relocatable()); |
a445fddf ILT |
5077 | Output_segment* oseg = new Output_segment(type, flags); |
5078 | this->segment_list_.push_back(oseg); | |
2d924fd9 ILT |
5079 | |
5080 | if (type == elfcpp::PT_TLS) | |
5081 | this->tls_segment_ = oseg; | |
5082 | else if (type == elfcpp::PT_GNU_RELRO) | |
5083 | this->relro_segment_ = oseg; | |
10b4f102 ILT |
5084 | else if (type == elfcpp::PT_INTERP) |
5085 | this->interp_segment_ = oseg; | |
2d924fd9 | 5086 | |
a445fddf ILT |
5087 | return oseg; |
5088 | } | |
5089 | ||
bec5b579 CC |
5090 | // Return the file offset of the normal symbol table. |
5091 | ||
5092 | off_t | |
5093 | Layout::symtab_section_offset() const | |
5094 | { | |
5095 | if (this->symtab_section_ != NULL) | |
5096 | return this->symtab_section_->offset(); | |
5097 | return 0; | |
5098 | } | |
5099 | ||
886f533a ILT |
5100 | // Return the section index of the normal symbol table. It may have |
5101 | // been stripped by the -s/--strip-all option. | |
5102 | ||
5103 | unsigned int | |
5104 | Layout::symtab_section_shndx() const | |
5105 | { | |
5106 | if (this->symtab_section_ != NULL) | |
5107 | return this->symtab_section_->out_shndx(); | |
5108 | return 0; | |
5109 | } | |
5110 | ||
730cdc88 ILT |
5111 | // Write out the Output_sections. Most won't have anything to write, |
5112 | // since most of the data will come from input sections which are | |
5113 | // handled elsewhere. But some Output_sections do have Output_data. | |
5114 | ||
5115 | void | |
5116 | Layout::write_output_sections(Output_file* of) const | |
5117 | { | |
5118 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5119 | p != this->section_list_.end(); | |
5120 | ++p) | |
5121 | { | |
5122 | if (!(*p)->after_input_sections()) | |
5123 | (*p)->write(of); | |
5124 | } | |
5125 | } | |
5126 | ||
61ba1cf9 ILT |
5127 | // Write out data not associated with a section or the symbol table. |
5128 | ||
5129 | void | |
9025d29d | 5130 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 5131 | { |
8851ecca | 5132 | if (!parameters->options().strip_all()) |
a3ad94ed | 5133 | { |
2ea97941 | 5134 | const Output_section* symtab_section = this->symtab_section_; |
9e2dcb77 ILT |
5135 | for (Section_list::const_iterator p = this->section_list_.begin(); |
5136 | p != this->section_list_.end(); | |
5137 | ++p) | |
a3ad94ed | 5138 | { |
9e2dcb77 ILT |
5139 | if ((*p)->needs_symtab_index()) |
5140 | { | |
2ea97941 | 5141 | gold_assert(symtab_section != NULL); |
9e2dcb77 ILT |
5142 | unsigned int index = (*p)->symtab_index(); |
5143 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
5144 | off_t off = (symtab_section->offset() |
5145 | + index * symtab_section->entsize()); | |
d491d34e | 5146 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
9e2dcb77 | 5147 | } |
a3ad94ed ILT |
5148 | } |
5149 | } | |
5150 | ||
2ea97941 | 5151 | const Output_section* dynsym_section = this->dynsym_section_; |
a3ad94ed ILT |
5152 | for (Section_list::const_iterator p = this->section_list_.begin(); |
5153 | p != this->section_list_.end(); | |
5154 | ++p) | |
5155 | { | |
5156 | if ((*p)->needs_dynsym_index()) | |
5157 | { | |
2ea97941 | 5158 | gold_assert(dynsym_section != NULL); |
a3ad94ed ILT |
5159 | unsigned int index = (*p)->dynsym_index(); |
5160 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
5161 | off_t off = (dynsym_section->offset() |
5162 | + index * dynsym_section->entsize()); | |
d491d34e | 5163 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
a3ad94ed ILT |
5164 | } |
5165 | } | |
5166 | ||
a3ad94ed | 5167 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
5168 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
5169 | p != this->special_output_list_.end(); | |
5170 | ++p) | |
5171 | (*p)->write(of); | |
5172 | } | |
5173 | ||
730cdc88 ILT |
5174 | // Write out the Output_sections which can only be written after the |
5175 | // input sections are complete. | |
5176 | ||
5177 | void | |
27bc2bce | 5178 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 5179 | { |
27bc2bce | 5180 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
5181 | // file size. Note we finalize the .shstrab last, to allow the |
5182 | // after_input_section sections to modify their section-names before | |
5183 | // writing. | |
17a1d0a9 | 5184 | if (this->any_postprocessing_sections_) |
27bc2bce | 5185 | { |
17a1d0a9 ILT |
5186 | off_t off = this->output_file_size_; |
5187 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); | |
8a4c0b0d | 5188 | |
17a1d0a9 ILT |
5189 | // Now that we've finalized the names, we can finalize the shstrab. |
5190 | off = | |
5191 | this->set_section_offsets(off, | |
5192 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
5193 | ||
5194 | if (off > this->output_file_size_) | |
5195 | { | |
5196 | of->resize(off); | |
5197 | this->output_file_size_ = off; | |
5198 | } | |
27bc2bce ILT |
5199 | } |
5200 | ||
730cdc88 ILT |
5201 | for (Section_list::const_iterator p = this->section_list_.begin(); |
5202 | p != this->section_list_.end(); | |
5203 | ++p) | |
5204 | { | |
5205 | if ((*p)->after_input_sections()) | |
5206 | (*p)->write(of); | |
5207 | } | |
27bc2bce | 5208 | |
27bc2bce | 5209 | this->section_headers_->write(of); |
730cdc88 ILT |
5210 | } |
5211 | ||
8ed814a9 ILT |
5212 | // If the build ID requires computing a checksum, do so here, and |
5213 | // write it out. We compute a checksum over the entire file because | |
5214 | // that is simplest. | |
5215 | ||
5216 | void | |
5217 | Layout::write_build_id(Output_file* of) const | |
5218 | { | |
5219 | if (this->build_id_note_ == NULL) | |
5220 | return; | |
5221 | ||
5222 | const unsigned char* iv = of->get_input_view(0, this->output_file_size_); | |
5223 | ||
5224 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), | |
5225 | this->build_id_note_->data_size()); | |
5226 | ||
5227 | const char* style = parameters->options().build_id(); | |
5228 | if (strcmp(style, "sha1") == 0) | |
5229 | { | |
5230 | sha1_ctx ctx; | |
5231 | sha1_init_ctx(&ctx); | |
5232 | sha1_process_bytes(iv, this->output_file_size_, &ctx); | |
5233 | sha1_finish_ctx(&ctx, ov); | |
5234 | } | |
5235 | else if (strcmp(style, "md5") == 0) | |
5236 | { | |
5237 | md5_ctx ctx; | |
5238 | md5_init_ctx(&ctx); | |
5239 | md5_process_bytes(iv, this->output_file_size_, &ctx); | |
5240 | md5_finish_ctx(&ctx, ov); | |
5241 | } | |
5242 | else | |
5243 | gold_unreachable(); | |
5244 | ||
5245 | of->write_output_view(this->build_id_note_->offset(), | |
5246 | this->build_id_note_->data_size(), | |
5247 | ov); | |
5248 | ||
5249 | of->free_input_view(0, this->output_file_size_, iv); | |
5250 | } | |
5251 | ||
516cb3d0 ILT |
5252 | // Write out a binary file. This is called after the link is |
5253 | // complete. IN is the temporary output file we used to generate the | |
5254 | // ELF code. We simply walk through the segments, read them from | |
5255 | // their file offset in IN, and write them to their load address in | |
5256 | // the output file. FIXME: with a bit more work, we could support | |
5257 | // S-records and/or Intel hex format here. | |
5258 | ||
5259 | void | |
5260 | Layout::write_binary(Output_file* in) const | |
5261 | { | |
e55bde5e | 5262 | gold_assert(parameters->options().oformat_enum() |
bc644c6c | 5263 | == General_options::OBJECT_FORMAT_BINARY); |
516cb3d0 ILT |
5264 | |
5265 | // Get the size of the binary file. | |
5266 | uint64_t max_load_address = 0; | |
5267 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
5268 | p != this->segment_list_.end(); | |
5269 | ++p) | |
5270 | { | |
5271 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
5272 | { | |
5273 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); | |
5274 | if (max_paddr > max_load_address) | |
5275 | max_load_address = max_paddr; | |
5276 | } | |
5277 | } | |
5278 | ||
8851ecca | 5279 | Output_file out(parameters->options().output_file_name()); |
516cb3d0 ILT |
5280 | out.open(max_load_address); |
5281 | ||
5282 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
5283 | p != this->segment_list_.end(); | |
5284 | ++p) | |
5285 | { | |
5286 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
5287 | { | |
5288 | const unsigned char* vin = in->get_input_view((*p)->offset(), | |
5289 | (*p)->filesz()); | |
5290 | unsigned char* vout = out.get_output_view((*p)->paddr(), | |
5291 | (*p)->filesz()); | |
5292 | memcpy(vout, vin, (*p)->filesz()); | |
5293 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); | |
5294 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); | |
5295 | } | |
5296 | } | |
5297 | ||
5298 | out.close(); | |
5299 | } | |
5300 | ||
7d9e3d98 ILT |
5301 | // Print the output sections to the map file. |
5302 | ||
5303 | void | |
5304 | Layout::print_to_mapfile(Mapfile* mapfile) const | |
5305 | { | |
5306 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
5307 | p != this->segment_list_.end(); | |
5308 | ++p) | |
5309 | (*p)->print_sections_to_mapfile(mapfile); | |
5310 | } | |
5311 | ||
ad8f37d1 ILT |
5312 | // Print statistical information to stderr. This is used for --stats. |
5313 | ||
5314 | void | |
5315 | Layout::print_stats() const | |
5316 | { | |
5317 | this->namepool_.print_stats("section name pool"); | |
5318 | this->sympool_.print_stats("output symbol name pool"); | |
5319 | this->dynpool_.print_stats("dynamic name pool"); | |
38c5e8b4 ILT |
5320 | |
5321 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
5322 | p != this->section_list_.end(); | |
5323 | ++p) | |
5324 | (*p)->print_merge_stats(); | |
ad8f37d1 ILT |
5325 | } |
5326 | ||
730cdc88 ILT |
5327 | // Write_sections_task methods. |
5328 | ||
5329 | // We can always run this task. | |
5330 | ||
17a1d0a9 ILT |
5331 | Task_token* |
5332 | Write_sections_task::is_runnable() | |
730cdc88 | 5333 | { |
17a1d0a9 | 5334 | return NULL; |
730cdc88 ILT |
5335 | } |
5336 | ||
5337 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
5338 | // when finished. | |
5339 | ||
17a1d0a9 ILT |
5340 | void |
5341 | Write_sections_task::locks(Task_locker* tl) | |
730cdc88 | 5342 | { |
17a1d0a9 ILT |
5343 | tl->add(this, this->output_sections_blocker_); |
5344 | tl->add(this, this->final_blocker_); | |
730cdc88 ILT |
5345 | } |
5346 | ||
5347 | // Run the task--write out the data. | |
5348 | ||
5349 | void | |
5350 | Write_sections_task::run(Workqueue*) | |
5351 | { | |
5352 | this->layout_->write_output_sections(this->of_); | |
5353 | } | |
5354 | ||
61ba1cf9 ILT |
5355 | // Write_data_task methods. |
5356 | ||
5357 | // We can always run this task. | |
5358 | ||
17a1d0a9 ILT |
5359 | Task_token* |
5360 | Write_data_task::is_runnable() | |
61ba1cf9 | 5361 | { |
17a1d0a9 | 5362 | return NULL; |
61ba1cf9 ILT |
5363 | } |
5364 | ||
5365 | // We need to unlock FINAL_BLOCKER when finished. | |
5366 | ||
17a1d0a9 ILT |
5367 | void |
5368 | Write_data_task::locks(Task_locker* tl) | |
61ba1cf9 | 5369 | { |
17a1d0a9 | 5370 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
5371 | } |
5372 | ||
5373 | // Run the task--write out the data. | |
5374 | ||
5375 | void | |
5376 | Write_data_task::run(Workqueue*) | |
5377 | { | |
9025d29d | 5378 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
5379 | } |
5380 | ||
5381 | // Write_symbols_task methods. | |
5382 | ||
5383 | // We can always run this task. | |
5384 | ||
17a1d0a9 ILT |
5385 | Task_token* |
5386 | Write_symbols_task::is_runnable() | |
61ba1cf9 | 5387 | { |
17a1d0a9 | 5388 | return NULL; |
61ba1cf9 ILT |
5389 | } |
5390 | ||
5391 | // We need to unlock FINAL_BLOCKER when finished. | |
5392 | ||
17a1d0a9 ILT |
5393 | void |
5394 | Write_symbols_task::locks(Task_locker* tl) | |
61ba1cf9 | 5395 | { |
17a1d0a9 | 5396 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
5397 | } |
5398 | ||
5399 | // Run the task--write out the symbols. | |
5400 | ||
5401 | void | |
5402 | Write_symbols_task::run(Workqueue*) | |
5403 | { | |
fd9d194f ILT |
5404 | this->symtab_->write_globals(this->sympool_, this->dynpool_, |
5405 | this->layout_->symtab_xindex(), | |
d491d34e | 5406 | this->layout_->dynsym_xindex(), this->of_); |
61ba1cf9 ILT |
5407 | } |
5408 | ||
730cdc88 ILT |
5409 | // Write_after_input_sections_task methods. |
5410 | ||
5411 | // We can only run this task after the input sections have completed. | |
5412 | ||
17a1d0a9 ILT |
5413 | Task_token* |
5414 | Write_after_input_sections_task::is_runnable() | |
730cdc88 ILT |
5415 | { |
5416 | if (this->input_sections_blocker_->is_blocked()) | |
17a1d0a9 ILT |
5417 | return this->input_sections_blocker_; |
5418 | return NULL; | |
730cdc88 ILT |
5419 | } |
5420 | ||
5421 | // We need to unlock FINAL_BLOCKER when finished. | |
5422 | ||
17a1d0a9 ILT |
5423 | void |
5424 | Write_after_input_sections_task::locks(Task_locker* tl) | |
730cdc88 | 5425 | { |
17a1d0a9 | 5426 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
5427 | } |
5428 | ||
5429 | // Run the task. | |
5430 | ||
5431 | void | |
5432 | Write_after_input_sections_task::run(Workqueue*) | |
5433 | { | |
5434 | this->layout_->write_sections_after_input_sections(this->of_); | |
5435 | } | |
5436 | ||
92e059d8 | 5437 | // Close_task_runner methods. |
61ba1cf9 ILT |
5438 | |
5439 | // Run the task--close the file. | |
5440 | ||
5441 | void | |
17a1d0a9 | 5442 | Close_task_runner::run(Workqueue*, const Task*) |
61ba1cf9 | 5443 | { |
8ed814a9 ILT |
5444 | // If we need to compute a checksum for the BUILD if, we do so here. |
5445 | this->layout_->write_build_id(this->of_); | |
5446 | ||
516cb3d0 | 5447 | // If we've been asked to create a binary file, we do so here. |
7cc619c3 | 5448 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
5449 | this->layout_->write_binary(this->of_); |
5450 | ||
61ba1cf9 ILT |
5451 | this->of_->close(); |
5452 | } | |
5453 | ||
a2fb1b05 ILT |
5454 | // Instantiate the templates we need. We could use the configure |
5455 | // script to restrict this to only the ones for implemented targets. | |
5456 | ||
193a53d9 | 5457 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 | 5458 | template |
cdc29364 CC |
5459 | Output_section* |
5460 | Layout::init_fixed_output_section<32, false>( | |
5461 | const char* name, | |
5462 | elfcpp::Shdr<32, false>& shdr); | |
5463 | #endif | |
5464 | ||
5465 | #ifdef HAVE_TARGET_32_BIG | |
5466 | template | |
5467 | Output_section* | |
5468 | Layout::init_fixed_output_section<32, true>( | |
5469 | const char* name, | |
5470 | elfcpp::Shdr<32, true>& shdr); | |
5471 | #endif | |
5472 | ||
5473 | #ifdef HAVE_TARGET_64_LITTLE | |
5474 | template | |
5475 | Output_section* | |
5476 | Layout::init_fixed_output_section<64, false>( | |
5477 | const char* name, | |
5478 | elfcpp::Shdr<64, false>& shdr); | |
5479 | #endif | |
5480 | ||
5481 | #ifdef HAVE_TARGET_64_BIG | |
5482 | template | |
5483 | Output_section* | |
5484 | Layout::init_fixed_output_section<64, true>( | |
5485 | const char* name, | |
5486 | elfcpp::Shdr<64, true>& shdr); | |
5487 | #endif | |
5488 | ||
5489 | #ifdef HAVE_TARGET_32_LITTLE | |
5490 | template | |
a2fb1b05 | 5491 | Output_section* |
6fa2a40b CC |
5492 | Layout::layout<32, false>(Sized_relobj_file<32, false>* object, |
5493 | unsigned int shndx, | |
730cdc88 ILT |
5494 | const char* name, |
5495 | const elfcpp::Shdr<32, false>& shdr, | |
5496 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5497 | #endif |
a2fb1b05 | 5498 | |
193a53d9 | 5499 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
5500 | template |
5501 | Output_section* | |
6fa2a40b CC |
5502 | Layout::layout<32, true>(Sized_relobj_file<32, true>* object, |
5503 | unsigned int shndx, | |
730cdc88 ILT |
5504 | const char* name, |
5505 | const elfcpp::Shdr<32, true>& shdr, | |
5506 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5507 | #endif |
a2fb1b05 | 5508 | |
193a53d9 | 5509 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
5510 | template |
5511 | Output_section* | |
6fa2a40b CC |
5512 | Layout::layout<64, false>(Sized_relobj_file<64, false>* object, |
5513 | unsigned int shndx, | |
730cdc88 ILT |
5514 | const char* name, |
5515 | const elfcpp::Shdr<64, false>& shdr, | |
5516 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5517 | #endif |
a2fb1b05 | 5518 | |
193a53d9 | 5519 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
5520 | template |
5521 | Output_section* | |
6fa2a40b CC |
5522 | Layout::layout<64, true>(Sized_relobj_file<64, true>* object, |
5523 | unsigned int shndx, | |
730cdc88 ILT |
5524 | const char* name, |
5525 | const elfcpp::Shdr<64, true>& shdr, | |
5526 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5527 | #endif |
a2fb1b05 | 5528 | |
6a74a719 ILT |
5529 | #ifdef HAVE_TARGET_32_LITTLE |
5530 | template | |
5531 | Output_section* | |
6fa2a40b | 5532 | Layout::layout_reloc<32, false>(Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
5533 | unsigned int reloc_shndx, |
5534 | const elfcpp::Shdr<32, false>& shdr, | |
5535 | Output_section* data_section, | |
5536 | Relocatable_relocs* rr); | |
5537 | #endif | |
5538 | ||
5539 | #ifdef HAVE_TARGET_32_BIG | |
5540 | template | |
5541 | Output_section* | |
6fa2a40b | 5542 | Layout::layout_reloc<32, true>(Sized_relobj_file<32, true>* object, |
6a74a719 ILT |
5543 | unsigned int reloc_shndx, |
5544 | const elfcpp::Shdr<32, true>& shdr, | |
5545 | Output_section* data_section, | |
5546 | Relocatable_relocs* rr); | |
5547 | #endif | |
5548 | ||
5549 | #ifdef HAVE_TARGET_64_LITTLE | |
5550 | template | |
5551 | Output_section* | |
6fa2a40b | 5552 | Layout::layout_reloc<64, false>(Sized_relobj_file<64, false>* object, |
6a74a719 ILT |
5553 | unsigned int reloc_shndx, |
5554 | const elfcpp::Shdr<64, false>& shdr, | |
5555 | Output_section* data_section, | |
5556 | Relocatable_relocs* rr); | |
5557 | #endif | |
5558 | ||
5559 | #ifdef HAVE_TARGET_64_BIG | |
5560 | template | |
5561 | Output_section* | |
6fa2a40b | 5562 | Layout::layout_reloc<64, true>(Sized_relobj_file<64, true>* object, |
6a74a719 ILT |
5563 | unsigned int reloc_shndx, |
5564 | const elfcpp::Shdr<64, true>& shdr, | |
5565 | Output_section* data_section, | |
5566 | Relocatable_relocs* rr); | |
5567 | #endif | |
5568 | ||
5569 | #ifdef HAVE_TARGET_32_LITTLE | |
5570 | template | |
5571 | void | |
5572 | Layout::layout_group<32, false>(Symbol_table* symtab, | |
6fa2a40b | 5573 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
5574 | unsigned int, |
5575 | const char* group_section_name, | |
5576 | const char* signature, | |
5577 | const elfcpp::Shdr<32, false>& shdr, | |
8825ac63 ILT |
5578 | elfcpp::Elf_Word flags, |
5579 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5580 | #endif |
5581 | ||
5582 | #ifdef HAVE_TARGET_32_BIG | |
5583 | template | |
5584 | void | |
5585 | Layout::layout_group<32, true>(Symbol_table* symtab, | |
6fa2a40b | 5586 | Sized_relobj_file<32, true>* object, |
6a74a719 ILT |
5587 | unsigned int, |
5588 | const char* group_section_name, | |
5589 | const char* signature, | |
5590 | const elfcpp::Shdr<32, true>& shdr, | |
8825ac63 ILT |
5591 | elfcpp::Elf_Word flags, |
5592 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5593 | #endif |
5594 | ||
5595 | #ifdef HAVE_TARGET_64_LITTLE | |
5596 | template | |
5597 | void | |
5598 | Layout::layout_group<64, false>(Symbol_table* symtab, | |
6fa2a40b | 5599 | Sized_relobj_file<64, false>* object, |
6a74a719 ILT |
5600 | unsigned int, |
5601 | const char* group_section_name, | |
5602 | const char* signature, | |
5603 | const elfcpp::Shdr<64, false>& shdr, | |
8825ac63 ILT |
5604 | elfcpp::Elf_Word flags, |
5605 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5606 | #endif |
5607 | ||
5608 | #ifdef HAVE_TARGET_64_BIG | |
5609 | template | |
5610 | void | |
5611 | Layout::layout_group<64, true>(Symbol_table* symtab, | |
6fa2a40b | 5612 | Sized_relobj_file<64, true>* object, |
6a74a719 ILT |
5613 | unsigned int, |
5614 | const char* group_section_name, | |
5615 | const char* signature, | |
5616 | const elfcpp::Shdr<64, true>& shdr, | |
8825ac63 ILT |
5617 | elfcpp::Elf_Word flags, |
5618 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5619 | #endif |
5620 | ||
730cdc88 ILT |
5621 | #ifdef HAVE_TARGET_32_LITTLE |
5622 | template | |
5623 | Output_section* | |
6fa2a40b | 5624 | Layout::layout_eh_frame<32, false>(Sized_relobj_file<32, false>* object, |
730cdc88 ILT |
5625 | const unsigned char* symbols, |
5626 | off_t symbols_size, | |
5627 | const unsigned char* symbol_names, | |
5628 | off_t symbol_names_size, | |
5629 | unsigned int shndx, | |
5630 | const elfcpp::Shdr<32, false>& shdr, | |
5631 | unsigned int reloc_shndx, | |
5632 | unsigned int reloc_type, | |
5633 | off_t* off); | |
5634 | #endif | |
5635 | ||
5636 | #ifdef HAVE_TARGET_32_BIG | |
5637 | template | |
5638 | Output_section* | |
6fa2a40b CC |
5639 | Layout::layout_eh_frame<32, true>(Sized_relobj_file<32, true>* object, |
5640 | const unsigned char* symbols, | |
5641 | off_t symbols_size, | |
730cdc88 ILT |
5642 | const unsigned char* symbol_names, |
5643 | off_t symbol_names_size, | |
5644 | unsigned int shndx, | |
5645 | const elfcpp::Shdr<32, true>& shdr, | |
5646 | unsigned int reloc_shndx, | |
5647 | unsigned int reloc_type, | |
5648 | off_t* off); | |
5649 | #endif | |
5650 | ||
5651 | #ifdef HAVE_TARGET_64_LITTLE | |
5652 | template | |
5653 | Output_section* | |
6fa2a40b | 5654 | Layout::layout_eh_frame<64, false>(Sized_relobj_file<64, false>* object, |
730cdc88 ILT |
5655 | const unsigned char* symbols, |
5656 | off_t symbols_size, | |
5657 | const unsigned char* symbol_names, | |
5658 | off_t symbol_names_size, | |
5659 | unsigned int shndx, | |
5660 | const elfcpp::Shdr<64, false>& shdr, | |
5661 | unsigned int reloc_shndx, | |
5662 | unsigned int reloc_type, | |
5663 | off_t* off); | |
5664 | #endif | |
5665 | ||
5666 | #ifdef HAVE_TARGET_64_BIG | |
5667 | template | |
5668 | Output_section* | |
6fa2a40b CC |
5669 | Layout::layout_eh_frame<64, true>(Sized_relobj_file<64, true>* object, |
5670 | const unsigned char* symbols, | |
5671 | off_t symbols_size, | |
730cdc88 ILT |
5672 | const unsigned char* symbol_names, |
5673 | off_t symbol_names_size, | |
5674 | unsigned int shndx, | |
5675 | const elfcpp::Shdr<64, true>& shdr, | |
5676 | unsigned int reloc_shndx, | |
5677 | unsigned int reloc_type, | |
5678 | off_t* off); | |
5679 | #endif | |
a2fb1b05 | 5680 | |
c1027032 CC |
5681 | #ifdef HAVE_TARGET_32_LITTLE |
5682 | template | |
5683 | void | |
5684 | Layout::add_to_gdb_index(bool is_type_unit, | |
5685 | Sized_relobj<32, false>* object, | |
5686 | const unsigned char* symbols, | |
5687 | off_t symbols_size, | |
5688 | unsigned int shndx, | |
5689 | unsigned int reloc_shndx, | |
5690 | unsigned int reloc_type); | |
5691 | #endif | |
5692 | ||
5693 | #ifdef HAVE_TARGET_32_BIG | |
5694 | template | |
5695 | void | |
5696 | Layout::add_to_gdb_index(bool is_type_unit, | |
5697 | Sized_relobj<32, true>* object, | |
5698 | const unsigned char* symbols, | |
5699 | off_t symbols_size, | |
5700 | unsigned int shndx, | |
5701 | unsigned int reloc_shndx, | |
5702 | unsigned int reloc_type); | |
5703 | #endif | |
5704 | ||
5705 | #ifdef HAVE_TARGET_64_LITTLE | |
5706 | template | |
5707 | void | |
5708 | Layout::add_to_gdb_index(bool is_type_unit, | |
5709 | Sized_relobj<64, false>* object, | |
5710 | const unsigned char* symbols, | |
5711 | off_t symbols_size, | |
5712 | unsigned int shndx, | |
5713 | unsigned int reloc_shndx, | |
5714 | unsigned int reloc_type); | |
5715 | #endif | |
5716 | ||
5717 | #ifdef HAVE_TARGET_64_BIG | |
5718 | template | |
5719 | void | |
5720 | Layout::add_to_gdb_index(bool is_type_unit, | |
5721 | Sized_relobj<64, true>* object, | |
5722 | const unsigned char* symbols, | |
5723 | off_t symbols_size, | |
5724 | unsigned int shndx, | |
5725 | unsigned int reloc_shndx, | |
5726 | unsigned int reloc_type); | |
5727 | #endif | |
5728 | ||
a2fb1b05 | 5729 | } // End namespace gold. |