Commit | Line | Data |
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a2fb1b05 ILT |
1 | // layout.cc -- lay out output file sections for gold |
2 | ||
3bb951e5 | 3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
a2fb1b05 ILT |
23 | #include "gold.h" |
24 | ||
8ed814a9 | 25 | #include <cerrno> |
a2fb1b05 | 26 | #include <cstring> |
54dc6425 | 27 | #include <algorithm> |
a2fb1b05 | 28 | #include <iostream> |
6e9ba2ca | 29 | #include <fstream> |
a2fb1b05 | 30 | #include <utility> |
8ed814a9 | 31 | #include <fcntl.h> |
6e9ba2ca | 32 | #include <fnmatch.h> |
8ed814a9 ILT |
33 | #include <unistd.h> |
34 | #include "libiberty.h" | |
35 | #include "md5.h" | |
36 | #include "sha1.h" | |
a2fb1b05 | 37 | |
7e1edb90 | 38 | #include "parameters.h" |
14144f39 | 39 | #include "options.h" |
7d9e3d98 | 40 | #include "mapfile.h" |
a445fddf ILT |
41 | #include "script.h" |
42 | #include "script-sections.h" | |
a2fb1b05 | 43 | #include "output.h" |
f6ce93d6 | 44 | #include "symtab.h" |
a3ad94ed | 45 | #include "dynobj.h" |
3151305a | 46 | #include "ehframe.h" |
96803768 | 47 | #include "compressed_output.h" |
62b01cb5 | 48 | #include "reduced_debug_output.h" |
487b39df | 49 | #include "object.h" |
6a74a719 | 50 | #include "reloc.h" |
2a00e4fb | 51 | #include "descriptors.h" |
2756a258 | 52 | #include "plugin.h" |
3ce2c28e ILT |
53 | #include "incremental.h" |
54 | #include "layout.h" | |
a2fb1b05 ILT |
55 | |
56 | namespace gold | |
57 | { | |
58 | ||
cdc29364 CC |
59 | // Class Free_list. |
60 | ||
61 | // The total number of free lists used. | |
62 | unsigned int Free_list::num_lists = 0; | |
63 | // The total number of free list nodes used. | |
64 | unsigned int Free_list::num_nodes = 0; | |
65 | // The total number of calls to Free_list::remove. | |
66 | unsigned int Free_list::num_removes = 0; | |
67 | // The total number of nodes visited during calls to Free_list::remove. | |
68 | unsigned int Free_list::num_remove_visits = 0; | |
69 | // The total number of calls to Free_list::allocate. | |
70 | unsigned int Free_list::num_allocates = 0; | |
71 | // The total number of nodes visited during calls to Free_list::allocate. | |
72 | unsigned int Free_list::num_allocate_visits = 0; | |
73 | ||
74 | // Initialize the free list. Creates a single free list node that | |
75 | // describes the entire region of length LEN. If EXTEND is true, | |
76 | // allocate() is allowed to extend the region beyond its initial | |
77 | // length. | |
78 | ||
79 | void | |
80 | Free_list::init(off_t len, bool extend) | |
81 | { | |
82 | this->list_.push_front(Free_list_node(0, len)); | |
83 | this->last_remove_ = this->list_.begin(); | |
84 | this->extend_ = extend; | |
85 | this->length_ = len; | |
86 | ++Free_list::num_lists; | |
87 | ++Free_list::num_nodes; | |
88 | } | |
89 | ||
90 | // Remove a chunk from the free list. Because we start with a single | |
91 | // node that covers the entire section, and remove chunks from it one | |
92 | // at a time, we do not need to coalesce chunks or handle cases that | |
93 | // span more than one free node. We expect to remove chunks from the | |
94 | // free list in order, and we expect to have only a few chunks of free | |
95 | // space left (corresponding to files that have changed since the last | |
96 | // incremental link), so a simple linear list should provide sufficient | |
97 | // performance. | |
98 | ||
99 | void | |
100 | Free_list::remove(off_t start, off_t end) | |
101 | { | |
102 | if (start == end) | |
103 | return; | |
104 | gold_assert(start < end); | |
105 | ||
106 | ++Free_list::num_removes; | |
107 | ||
108 | Iterator p = this->last_remove_; | |
109 | if (p->start_ > start) | |
110 | p = this->list_.begin(); | |
111 | ||
112 | for (; p != this->list_.end(); ++p) | |
113 | { | |
114 | ++Free_list::num_remove_visits; | |
115 | // Find a node that wholly contains the indicated region. | |
116 | if (p->start_ <= start && p->end_ >= end) | |
117 | { | |
118 | // Case 1: the indicated region spans the whole node. | |
119 | // Add some fuzz to avoid creating tiny free chunks. | |
120 | if (p->start_ + 3 >= start && p->end_ <= end + 3) | |
121 | p = this->list_.erase(p); | |
122 | // Case 2: remove a chunk from the start of the node. | |
123 | else if (p->start_ + 3 >= start) | |
124 | p->start_ = end; | |
125 | // Case 3: remove a chunk from the end of the node. | |
126 | else if (p->end_ <= end + 3) | |
127 | p->end_ = start; | |
128 | // Case 4: remove a chunk from the middle, and split | |
129 | // the node into two. | |
130 | else | |
131 | { | |
132 | Free_list_node newnode(p->start_, start); | |
133 | p->start_ = end; | |
134 | this->list_.insert(p, newnode); | |
135 | ++Free_list::num_nodes; | |
136 | } | |
137 | this->last_remove_ = p; | |
138 | return; | |
139 | } | |
140 | } | |
141 | ||
142 | // Did not find a node containing the given chunk. This could happen | |
143 | // because a small chunk was already removed due to the fuzz. | |
144 | gold_debug(DEBUG_INCREMENTAL, | |
145 | "Free_list::remove(%d,%d) not found", | |
146 | static_cast<int>(start), static_cast<int>(end)); | |
147 | } | |
148 | ||
149 | // Allocate a chunk of size LEN from the free list. Returns -1ULL | |
150 | // if a sufficiently large chunk of free space is not found. | |
151 | // We use a simple first-fit algorithm. | |
152 | ||
153 | off_t | |
154 | Free_list::allocate(off_t len, uint64_t align, off_t minoff) | |
155 | { | |
156 | gold_debug(DEBUG_INCREMENTAL, | |
157 | "Free_list::allocate(%08lx, %d, %08lx)", | |
158 | static_cast<long>(len), static_cast<int>(align), | |
159 | static_cast<long>(minoff)); | |
160 | if (len == 0) | |
161 | return align_address(minoff, align); | |
162 | ||
163 | ++Free_list::num_allocates; | |
164 | ||
8ea8cd50 CC |
165 | // We usually want to drop free chunks smaller than 4 bytes. |
166 | // If we need to guarantee a minimum hole size, though, we need | |
167 | // to keep track of all free chunks. | |
168 | const int fuzz = this->min_hole_ > 0 ? 0 : 3; | |
169 | ||
cdc29364 CC |
170 | for (Iterator p = this->list_.begin(); p != this->list_.end(); ++p) |
171 | { | |
172 | ++Free_list::num_allocate_visits; | |
173 | off_t start = p->start_ > minoff ? p->start_ : minoff; | |
174 | start = align_address(start, align); | |
175 | off_t end = start + len; | |
9fbd3822 CC |
176 | if (end > p->end_ && p->end_ == this->length_ && this->extend_) |
177 | { | |
178 | this->length_ = end; | |
179 | p->end_ = end; | |
180 | } | |
8ea8cd50 | 181 | if (end == p->end_ || (end <= p->end_ - this->min_hole_)) |
cdc29364 | 182 | { |
8ea8cd50 | 183 | if (p->start_ + fuzz >= start && p->end_ <= end + fuzz) |
cdc29364 | 184 | this->list_.erase(p); |
8ea8cd50 | 185 | else if (p->start_ + fuzz >= start) |
cdc29364 | 186 | p->start_ = end; |
8ea8cd50 | 187 | else if (p->end_ <= end + fuzz) |
cdc29364 CC |
188 | p->end_ = start; |
189 | else | |
190 | { | |
191 | Free_list_node newnode(p->start_, start); | |
192 | p->start_ = end; | |
193 | this->list_.insert(p, newnode); | |
194 | ++Free_list::num_nodes; | |
195 | } | |
196 | return start; | |
197 | } | |
198 | } | |
9fbd3822 CC |
199 | if (this->extend_) |
200 | { | |
201 | off_t start = align_address(this->length_, align); | |
202 | this->length_ = start + len; | |
203 | return start; | |
204 | } | |
cdc29364 CC |
205 | return -1; |
206 | } | |
207 | ||
208 | // Dump the free list (for debugging). | |
209 | void | |
210 | Free_list::dump() | |
211 | { | |
212 | gold_info("Free list:\n start end length\n"); | |
213 | for (Iterator p = this->list_.begin(); p != this->list_.end(); ++p) | |
214 | gold_info(" %08lx %08lx %08lx", static_cast<long>(p->start_), | |
215 | static_cast<long>(p->end_), | |
216 | static_cast<long>(p->end_ - p->start_)); | |
217 | } | |
218 | ||
219 | // Print the statistics for the free lists. | |
220 | void | |
221 | Free_list::print_stats() | |
222 | { | |
223 | fprintf(stderr, _("%s: total free lists: %u\n"), | |
224 | program_name, Free_list::num_lists); | |
225 | fprintf(stderr, _("%s: total free list nodes: %u\n"), | |
226 | program_name, Free_list::num_nodes); | |
227 | fprintf(stderr, _("%s: calls to Free_list::remove: %u\n"), | |
228 | program_name, Free_list::num_removes); | |
229 | fprintf(stderr, _("%s: nodes visited: %u\n"), | |
230 | program_name, Free_list::num_remove_visits); | |
231 | fprintf(stderr, _("%s: calls to Free_list::allocate: %u\n"), | |
232 | program_name, Free_list::num_allocates); | |
233 | fprintf(stderr, _("%s: nodes visited: %u\n"), | |
234 | program_name, Free_list::num_allocate_visits); | |
235 | } | |
236 | ||
20e6d0d6 DK |
237 | // Layout::Relaxation_debug_check methods. |
238 | ||
239 | // Check that sections and special data are in reset states. | |
240 | // We do not save states for Output_sections and special Output_data. | |
241 | // So we check that they have not assigned any addresses or offsets. | |
242 | // clean_up_after_relaxation simply resets their addresses and offsets. | |
243 | void | |
244 | Layout::Relaxation_debug_check::check_output_data_for_reset_values( | |
245 | const Layout::Section_list& sections, | |
246 | const Layout::Data_list& special_outputs) | |
247 | { | |
248 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
249 | p != sections.end(); | |
250 | ++p) | |
251 | gold_assert((*p)->address_and_file_offset_have_reset_values()); | |
252 | ||
253 | for(Layout::Data_list::const_iterator p = special_outputs.begin(); | |
254 | p != special_outputs.end(); | |
255 | ++p) | |
256 | gold_assert((*p)->address_and_file_offset_have_reset_values()); | |
257 | } | |
258 | ||
259 | // Save information of SECTIONS for checking later. | |
260 | ||
261 | void | |
262 | Layout::Relaxation_debug_check::read_sections( | |
263 | const Layout::Section_list& sections) | |
264 | { | |
265 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
266 | p != sections.end(); | |
267 | ++p) | |
268 | { | |
269 | Output_section* os = *p; | |
270 | Section_info info; | |
271 | info.output_section = os; | |
272 | info.address = os->is_address_valid() ? os->address() : 0; | |
273 | info.data_size = os->is_data_size_valid() ? os->data_size() : -1; | |
274 | info.offset = os->is_offset_valid()? os->offset() : -1 ; | |
275 | this->section_infos_.push_back(info); | |
276 | } | |
277 | } | |
278 | ||
279 | // Verify SECTIONS using previously recorded information. | |
280 | ||
281 | void | |
282 | Layout::Relaxation_debug_check::verify_sections( | |
283 | const Layout::Section_list& sections) | |
284 | { | |
285 | size_t i = 0; | |
286 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
287 | p != sections.end(); | |
288 | ++p, ++i) | |
289 | { | |
290 | Output_section* os = *p; | |
291 | uint64_t address = os->is_address_valid() ? os->address() : 0; | |
292 | off_t data_size = os->is_data_size_valid() ? os->data_size() : -1; | |
293 | off_t offset = os->is_offset_valid()? os->offset() : -1 ; | |
294 | ||
295 | if (i >= this->section_infos_.size()) | |
296 | { | |
297 | gold_fatal("Section_info of %s missing.\n", os->name()); | |
298 | } | |
299 | const Section_info& info = this->section_infos_[i]; | |
300 | if (os != info.output_section) | |
301 | gold_fatal("Section order changed. Expecting %s but see %s\n", | |
302 | info.output_section->name(), os->name()); | |
303 | if (address != info.address | |
304 | || data_size != info.data_size | |
305 | || offset != info.offset) | |
306 | gold_fatal("Section %s changed.\n", os->name()); | |
307 | } | |
308 | } | |
309 | ||
92e059d8 | 310 | // Layout_task_runner methods. |
a2fb1b05 ILT |
311 | |
312 | // Lay out the sections. This is called after all the input objects | |
313 | // have been read. | |
314 | ||
315 | void | |
17a1d0a9 | 316 | Layout_task_runner::run(Workqueue* workqueue, const Task* task) |
a2fb1b05 | 317 | { |
94a3fc8b CC |
318 | Layout* layout = this->layout_; |
319 | off_t file_size = layout->finalize(this->input_objects_, | |
320 | this->symtab_, | |
321 | this->target_, | |
322 | task); | |
61ba1cf9 ILT |
323 | |
324 | // Now we know the final size of the output file and we know where | |
325 | // each piece of information goes. | |
7d9e3d98 ILT |
326 | |
327 | if (this->mapfile_ != NULL) | |
328 | { | |
329 | this->mapfile_->print_discarded_sections(this->input_objects_); | |
94a3fc8b | 330 | layout->print_to_mapfile(this->mapfile_); |
7d9e3d98 ILT |
331 | } |
332 | ||
cdc29364 | 333 | Output_file* of; |
94a3fc8b | 334 | if (layout->incremental_base() == NULL) |
cdc29364 CC |
335 | { |
336 | of = new Output_file(parameters->options().output_file_name()); | |
337 | if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF) | |
338 | of->set_is_temporary(); | |
339 | of->open(file_size); | |
340 | } | |
341 | else | |
342 | { | |
94a3fc8b CC |
343 | of = layout->incremental_base()->output_file(); |
344 | ||
345 | // Apply the incremental relocations for symbols whose values | |
346 | // have changed. We do this before we resize the file and start | |
347 | // writing anything else to it, so that we can read the old | |
348 | // incremental information from the file before (possibly) | |
349 | // overwriting it. | |
350 | if (parameters->incremental_update()) | |
351 | layout->incremental_base()->apply_incremental_relocs(this->symtab_, | |
352 | this->layout_, | |
353 | of); | |
354 | ||
cdc29364 CC |
355 | of->resize(file_size); |
356 | } | |
61ba1cf9 ILT |
357 | |
358 | // Queue up the final set of tasks. | |
359 | gold::queue_final_tasks(this->options_, this->input_objects_, | |
94a3fc8b | 360 | this->symtab_, layout, workqueue, of); |
a2fb1b05 ILT |
361 | } |
362 | ||
363 | // Layout methods. | |
364 | ||
2ea97941 | 365 | Layout::Layout(int number_of_input_files, Script_options* script_options) |
e55bde5e | 366 | : number_of_input_files_(number_of_input_files), |
2ea97941 | 367 | script_options_(script_options), |
d491d34e ILT |
368 | namepool_(), |
369 | sympool_(), | |
370 | dynpool_(), | |
371 | signatures_(), | |
372 | section_name_map_(), | |
373 | segment_list_(), | |
374 | section_list_(), | |
375 | unattached_section_list_(), | |
d491d34e ILT |
376 | special_output_list_(), |
377 | section_headers_(NULL), | |
378 | tls_segment_(NULL), | |
9f1d377b | 379 | relro_segment_(NULL), |
10b4f102 | 380 | interp_segment_(NULL), |
1a2dff53 | 381 | increase_relro_(0), |
d491d34e ILT |
382 | symtab_section_(NULL), |
383 | symtab_xindex_(NULL), | |
384 | dynsym_section_(NULL), | |
385 | dynsym_xindex_(NULL), | |
386 | dynamic_section_(NULL), | |
f0ba79e2 | 387 | dynamic_symbol_(NULL), |
d491d34e ILT |
388 | dynamic_data_(NULL), |
389 | eh_frame_section_(NULL), | |
390 | eh_frame_data_(NULL), | |
391 | added_eh_frame_data_(false), | |
392 | eh_frame_hdr_section_(NULL), | |
393 | build_id_note_(NULL), | |
62b01cb5 ILT |
394 | debug_abbrev_(NULL), |
395 | debug_info_(NULL), | |
d491d34e ILT |
396 | group_signatures_(), |
397 | output_file_size_(-1), | |
d7bb5745 | 398 | have_added_input_section_(false), |
e55bde5e | 399 | sections_are_attached_(false), |
35cdfc9a ILT |
400 | input_requires_executable_stack_(false), |
401 | input_with_gnu_stack_note_(false), | |
535890bb | 402 | input_without_gnu_stack_note_(false), |
17a1d0a9 | 403 | has_static_tls_(false), |
e55bde5e | 404 | any_postprocessing_sections_(false), |
3ce2c28e | 405 | resized_signatures_(false), |
1518dc8f | 406 | have_stabstr_section_(false), |
e9552f7e | 407 | section_ordering_specified_(false), |
20e6d0d6 DK |
408 | incremental_inputs_(NULL), |
409 | record_output_section_data_from_script_(false), | |
410 | script_output_section_data_list_(), | |
411 | segment_states_(NULL), | |
cdc29364 | 412 | relaxation_debug_check_(NULL), |
f0558624 | 413 | section_order_map_(), |
e9552f7e ST |
414 | input_section_position_(), |
415 | input_section_glob_(), | |
cdc29364 CC |
416 | incremental_base_(NULL), |
417 | free_list_() | |
54dc6425 ILT |
418 | { |
419 | // Make space for more than enough segments for a typical file. | |
420 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
421 | this->segment_list_.reserve(12); |
422 | ||
27bc2bce ILT |
423 | // We expect two unattached Output_data objects: the file header and |
424 | // the segment headers. | |
425 | this->special_output_list_.reserve(2); | |
3ce2c28e ILT |
426 | |
427 | // Initialize structure needed for an incremental build. | |
8c21d9d3 | 428 | if (parameters->incremental()) |
3ce2c28e | 429 | this->incremental_inputs_ = new Incremental_inputs; |
f7c8a183 ILT |
430 | |
431 | // The section name pool is worth optimizing in all cases, because | |
432 | // it is small, but there are often overlaps due to .rel sections. | |
433 | this->namepool_.set_optimize(); | |
54dc6425 ILT |
434 | } |
435 | ||
cdc29364 CC |
436 | // For incremental links, record the base file to be modified. |
437 | ||
438 | void | |
439 | Layout::set_incremental_base(Incremental_binary* base) | |
440 | { | |
441 | this->incremental_base_ = base; | |
442 | this->free_list_.init(base->output_file()->filesize(), true); | |
443 | } | |
444 | ||
a2fb1b05 ILT |
445 | // Hash a key we use to look up an output section mapping. |
446 | ||
447 | size_t | |
448 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
449 | { | |
f0641a0b | 450 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
451 | } |
452 | ||
02d2ba74 ILT |
453 | // Returns whether the given section is in the list of |
454 | // debug-sections-used-by-some-version-of-gdb. Currently, | |
455 | // we've checked versions of gdb up to and including 6.7.1. | |
456 | ||
457 | static const char* gdb_sections[] = | |
458 | { ".debug_abbrev", | |
459 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
460 | ".debug_frame", | |
461 | ".debug_info", | |
a0506cca | 462 | ".debug_types", |
02d2ba74 ILT |
463 | ".debug_line", |
464 | ".debug_loc", | |
465 | ".debug_macinfo", | |
466 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
467 | ".debug_ranges", | |
468 | ".debug_str", | |
469 | }; | |
470 | ||
62b01cb5 ILT |
471 | static const char* lines_only_debug_sections[] = |
472 | { ".debug_abbrev", | |
473 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
474 | // ".debug_frame", | |
475 | ".debug_info", | |
a0506cca | 476 | // ".debug_types", |
62b01cb5 ILT |
477 | ".debug_line", |
478 | // ".debug_loc", | |
479 | // ".debug_macinfo", | |
480 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
481 | // ".debug_ranges", | |
482 | ".debug_str", | |
483 | }; | |
484 | ||
02d2ba74 ILT |
485 | static inline bool |
486 | is_gdb_debug_section(const char* str) | |
487 | { | |
488 | // We can do this faster: binary search or a hashtable. But why bother? | |
489 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) | |
490 | if (strcmp(str, gdb_sections[i]) == 0) | |
491 | return true; | |
492 | return false; | |
493 | } | |
494 | ||
62b01cb5 ILT |
495 | static inline bool |
496 | is_lines_only_debug_section(const char* str) | |
497 | { | |
498 | // We can do this faster: binary search or a hashtable. But why bother? | |
499 | for (size_t i = 0; | |
500 | i < sizeof(lines_only_debug_sections)/sizeof(*lines_only_debug_sections); | |
501 | ++i) | |
502 | if (strcmp(str, lines_only_debug_sections[i]) == 0) | |
503 | return true; | |
504 | return false; | |
505 | } | |
506 | ||
6fc6ea19 CC |
507 | // Sometimes we compress sections. This is typically done for |
508 | // sections that are not part of normal program execution (such as | |
509 | // .debug_* sections), and where the readers of these sections know | |
510 | // how to deal with compressed sections. This routine doesn't say for | |
511 | // certain whether we'll compress -- it depends on commandline options | |
512 | // as well -- just whether this section is a candidate for compression. | |
513 | // (The Output_compressed_section class decides whether to compress | |
514 | // a given section, and picks the name of the compressed section.) | |
515 | ||
516 | static bool | |
517 | is_compressible_debug_section(const char* secname) | |
518 | { | |
519 | return (is_prefix_of(".debug", secname)); | |
520 | } | |
521 | ||
522 | // We may see compressed debug sections in input files. Return TRUE | |
523 | // if this is the name of a compressed debug section. | |
524 | ||
525 | bool | |
526 | is_compressed_debug_section(const char* secname) | |
527 | { | |
528 | return (is_prefix_of(".zdebug", secname)); | |
529 | } | |
530 | ||
a2fb1b05 ILT |
531 | // Whether to include this section in the link. |
532 | ||
533 | template<int size, bool big_endian> | |
534 | bool | |
6fa2a40b | 535 | Layout::include_section(Sized_relobj_file<size, big_endian>*, const char* name, |
a2fb1b05 ILT |
536 | const elfcpp::Shdr<size, big_endian>& shdr) |
537 | { | |
fd06b4aa CC |
538 | if (shdr.get_sh_flags() & elfcpp::SHF_EXCLUDE) |
539 | return false; | |
540 | ||
a2fb1b05 ILT |
541 | switch (shdr.get_sh_type()) |
542 | { | |
543 | case elfcpp::SHT_NULL: | |
544 | case elfcpp::SHT_SYMTAB: | |
545 | case elfcpp::SHT_DYNSYM: | |
a2fb1b05 ILT |
546 | case elfcpp::SHT_HASH: |
547 | case elfcpp::SHT_DYNAMIC: | |
548 | case elfcpp::SHT_SYMTAB_SHNDX: | |
549 | return false; | |
550 | ||
5cb66f97 ILT |
551 | case elfcpp::SHT_STRTAB: |
552 | // Discard the sections which have special meanings in the ELF | |
553 | // ABI. Keep others (e.g., .stabstr). We could also do this by | |
554 | // checking the sh_link fields of the appropriate sections. | |
555 | return (strcmp(name, ".dynstr") != 0 | |
556 | && strcmp(name, ".strtab") != 0 | |
557 | && strcmp(name, ".shstrtab") != 0); | |
558 | ||
a2fb1b05 ILT |
559 | case elfcpp::SHT_RELA: |
560 | case elfcpp::SHT_REL: | |
561 | case elfcpp::SHT_GROUP: | |
7019cd25 ILT |
562 | // If we are emitting relocations these should be handled |
563 | // elsewhere. | |
8851ecca ILT |
564 | gold_assert(!parameters->options().relocatable() |
565 | && !parameters->options().emit_relocs()); | |
6a74a719 | 566 | return false; |
a2fb1b05 | 567 | |
9e2dcb77 | 568 | case elfcpp::SHT_PROGBITS: |
8851ecca | 569 | if (parameters->options().strip_debug() |
9e2dcb77 ILT |
570 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
571 | { | |
e94cf127 | 572 | if (is_debug_info_section(name)) |
9e2dcb77 ILT |
573 | return false; |
574 | } | |
62b01cb5 ILT |
575 | if (parameters->options().strip_debug_non_line() |
576 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
577 | { | |
578 | // Debugging sections can only be recognized by name. | |
579 | if (is_prefix_of(".debug", name) | |
580 | && !is_lines_only_debug_section(name)) | |
581 | return false; | |
582 | } | |
8851ecca | 583 | if (parameters->options().strip_debug_gdb() |
02d2ba74 ILT |
584 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
585 | { | |
586 | // Debugging sections can only be recognized by name. | |
587 | if (is_prefix_of(".debug", name) | |
588 | && !is_gdb_debug_section(name)) | |
589 | return false; | |
590 | } | |
fd06b4aa CC |
591 | if (parameters->options().strip_lto_sections() |
592 | && !parameters->options().relocatable() | |
593 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
594 | { | |
595 | // Ignore LTO sections containing intermediate code. | |
596 | if (is_prefix_of(".gnu.lto_", name)) | |
597 | return false; | |
598 | } | |
6b7dd3f3 ILT |
599 | // The GNU linker strips .gnu_debuglink sections, so we do too. |
600 | // This is a feature used to keep debugging information in | |
601 | // separate files. | |
602 | if (strcmp(name, ".gnu_debuglink") == 0) | |
603 | return false; | |
9e2dcb77 ILT |
604 | return true; |
605 | ||
a2fb1b05 | 606 | default: |
a2fb1b05 ILT |
607 | return true; |
608 | } | |
609 | } | |
610 | ||
ead1e424 | 611 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 612 | |
a2fb1b05 | 613 | Output_section* |
ead1e424 | 614 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 615 | { |
a445fddf ILT |
616 | for (Section_list::const_iterator p = this->section_list_.begin(); |
617 | p != this->section_list_.end(); | |
ead1e424 | 618 | ++p) |
a445fddf ILT |
619 | if (strcmp((*p)->name(), name) == 0) |
620 | return *p; | |
ead1e424 ILT |
621 | return NULL; |
622 | } | |
a2fb1b05 | 623 | |
ead1e424 ILT |
624 | // Return an output segment of type TYPE, with segment flags SET set |
625 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 626 | |
ead1e424 ILT |
627 | Output_segment* |
628 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
629 | elfcpp::Elf_Word clear) const | |
630 | { | |
631 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
632 | p != this->segment_list_.end(); | |
633 | ++p) | |
634 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
635 | && ((*p)->flags() & set) == set | |
636 | && ((*p)->flags() & clear) == 0) | |
637 | return *p; | |
638 | return NULL; | |
639 | } | |
a2fb1b05 | 640 | |
487b39df ILT |
641 | // When we put a .ctors or .dtors section with more than one word into |
642 | // a .init_array or .fini_array section, we need to reverse the words | |
643 | // in the .ctors/.dtors section. This is because .init_array executes | |
644 | // constructors front to back, where .ctors executes them back to | |
645 | // front, and vice-versa for .fini_array/.dtors. Although we do want | |
646 | // to remap .ctors/.dtors into .init_array/.fini_array because it can | |
647 | // be more efficient, we don't want to change the order in which | |
648 | // constructors/destructors are run. This set just keeps track of | |
649 | // these sections which need to be reversed. It is only changed by | |
650 | // Layout::layout. It should be a private member of Layout, but that | |
651 | // would require layout.h to #include object.h to get the definition | |
652 | // of Section_id. | |
653 | static Unordered_set<Section_id, Section_id_hash> ctors_sections_in_init_array; | |
654 | ||
655 | // Return whether OBJECT/SHNDX is a .ctors/.dtors section mapped to a | |
656 | // .init_array/.fini_array section. | |
657 | ||
658 | bool | |
659 | Layout::is_ctors_in_init_array(Relobj* relobj, unsigned int shndx) const | |
660 | { | |
661 | return (ctors_sections_in_init_array.find(Section_id(relobj, shndx)) | |
662 | != ctors_sections_in_init_array.end()); | |
663 | } | |
664 | ||
ead1e424 | 665 | // Return the output section to use for section NAME with type TYPE |
a445fddf | 666 | // and section flags FLAGS. NAME must be canonicalized in the string |
10b4f102 ILT |
667 | // pool, and NAME_KEY is the key. ORDER is where this should appear |
668 | // in the output sections. IS_RELRO is true for a relro section. | |
a2fb1b05 | 669 | |
ead1e424 | 670 | Output_section* |
f0641a0b | 671 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
f5c870d2 | 672 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, |
22f0da72 | 673 | Output_section_order order, bool is_relro) |
ead1e424 | 674 | { |
5393d741 ILT |
675 | elfcpp::Elf_Word lookup_type = type; |
676 | ||
677 | // For lookup purposes, treat INIT_ARRAY, FINI_ARRAY, and | |
678 | // PREINIT_ARRAY like PROGBITS. This ensures that we combine | |
679 | // .init_array, .fini_array, and .preinit_array sections by name | |
680 | // whatever their type in the input file. We do this because the | |
681 | // types are not always right in the input files. | |
682 | if (lookup_type == elfcpp::SHT_INIT_ARRAY | |
683 | || lookup_type == elfcpp::SHT_FINI_ARRAY | |
684 | || lookup_type == elfcpp::SHT_PREINIT_ARRAY) | |
685 | lookup_type = elfcpp::SHT_PROGBITS; | |
686 | ||
154e0e9a ILT |
687 | elfcpp::Elf_Xword lookup_flags = flags; |
688 | ||
689 | // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine | |
690 | // read-write with read-only sections. Some other ELF linkers do | |
691 | // not do this. FIXME: Perhaps there should be an option | |
692 | // controlling this. | |
693 | lookup_flags &= ~(elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
694 | ||
5393d741 | 695 | const Key key(name_key, std::make_pair(lookup_type, lookup_flags)); |
a2fb1b05 ILT |
696 | const std::pair<Key, Output_section*> v(key, NULL); |
697 | std::pair<Section_name_map::iterator, bool> ins( | |
698 | this->section_name_map_.insert(v)); | |
699 | ||
a2fb1b05 | 700 | if (!ins.second) |
ead1e424 | 701 | return ins.first->second; |
a2fb1b05 ILT |
702 | else |
703 | { | |
704 | // This is the first time we've seen this name/type/flags | |
4e2b1697 ILT |
705 | // combination. For compatibility with the GNU linker, we |
706 | // combine sections with contents and zero flags with sections | |
707 | // with non-zero flags. This is a workaround for cases where | |
708 | // assembler code forgets to set section flags. FIXME: Perhaps | |
709 | // there should be an option to control this. | |
15cf077e | 710 | Output_section* os = NULL; |
4e2b1697 | 711 | |
5393d741 | 712 | if (lookup_type == elfcpp::SHT_PROGBITS) |
15cf077e | 713 | { |
4e2b1697 ILT |
714 | if (flags == 0) |
715 | { | |
716 | Output_section* same_name = this->find_output_section(name); | |
717 | if (same_name != NULL | |
5393d741 ILT |
718 | && (same_name->type() == elfcpp::SHT_PROGBITS |
719 | || same_name->type() == elfcpp::SHT_INIT_ARRAY | |
720 | || same_name->type() == elfcpp::SHT_FINI_ARRAY | |
721 | || same_name->type() == elfcpp::SHT_PREINIT_ARRAY) | |
4e2b1697 ILT |
722 | && (same_name->flags() & elfcpp::SHF_TLS) == 0) |
723 | os = same_name; | |
724 | } | |
725 | else if ((flags & elfcpp::SHF_TLS) == 0) | |
726 | { | |
727 | elfcpp::Elf_Xword zero_flags = 0; | |
5393d741 ILT |
728 | const Key zero_key(name_key, std::make_pair(lookup_type, |
729 | zero_flags)); | |
4e2b1697 ILT |
730 | Section_name_map::iterator p = |
731 | this->section_name_map_.find(zero_key); | |
732 | if (p != this->section_name_map_.end()) | |
154e0e9a | 733 | os = p->second; |
4e2b1697 | 734 | } |
15cf077e | 735 | } |
4e2b1697 | 736 | |
15cf077e | 737 | if (os == NULL) |
22f0da72 ILT |
738 | os = this->make_output_section(name, type, flags, order, is_relro); |
739 | ||
a2fb1b05 | 740 | ins.first->second = os; |
ead1e424 | 741 | return os; |
a2fb1b05 | 742 | } |
ead1e424 ILT |
743 | } |
744 | ||
a445fddf ILT |
745 | // Pick the output section to use for section NAME, in input file |
746 | // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a | |
154e0e9a ILT |
747 | // linker created section. IS_INPUT_SECTION is true if we are |
748 | // choosing an output section for an input section found in a input | |
10b4f102 ILT |
749 | // file. ORDER is where this section should appear in the output |
750 | // sections. IS_RELRO is true for a relro section. This will return | |
751 | // NULL if the input section should be discarded. | |
a445fddf ILT |
752 | |
753 | Output_section* | |
754 | Layout::choose_output_section(const Relobj* relobj, const char* name, | |
755 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
22f0da72 ILT |
756 | bool is_input_section, Output_section_order order, |
757 | bool is_relro) | |
a445fddf | 758 | { |
154e0e9a ILT |
759 | // We should not see any input sections after we have attached |
760 | // sections to segments. | |
761 | gold_assert(!is_input_section || !this->sections_are_attached_); | |
762 | ||
763 | // Some flags in the input section should not be automatically | |
764 | // copied to the output section. | |
a445fddf | 765 | flags &= ~ (elfcpp::SHF_INFO_LINK |
a445fddf ILT |
766 | | elfcpp::SHF_GROUP |
767 | | elfcpp::SHF_MERGE | |
768 | | elfcpp::SHF_STRINGS); | |
769 | ||
c9484ea5 DK |
770 | // We only clear the SHF_LINK_ORDER flag in for |
771 | // a non-relocatable link. | |
772 | if (!parameters->options().relocatable()) | |
773 | flags &= ~elfcpp::SHF_LINK_ORDER; | |
774 | ||
a445fddf ILT |
775 | if (this->script_options_->saw_sections_clause()) |
776 | { | |
777 | // We are using a SECTIONS clause, so the output section is | |
778 | // chosen based only on the name. | |
779 | ||
780 | Script_sections* ss = this->script_options_->script_sections(); | |
781 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
782 | Output_section** output_section_slot; | |
1e5d2fb1 | 783 | Script_sections::Section_type script_section_type; |
7f8cd844 | 784 | const char* orig_name = name; |
1e5d2fb1 DK |
785 | name = ss->output_section_name(file_name, name, &output_section_slot, |
786 | &script_section_type); | |
a445fddf ILT |
787 | if (name == NULL) |
788 | { | |
7f8cd844 NC |
789 | gold_debug(DEBUG_SCRIPT, _("Unable to create output section '%s' " |
790 | "because it is not allowed by the " | |
791 | "SECTIONS clause of the linker script"), | |
792 | orig_name); | |
a445fddf ILT |
793 | // The SECTIONS clause says to discard this input section. |
794 | return NULL; | |
795 | } | |
796 | ||
1e5d2fb1 DK |
797 | // We can only handle script section types ST_NONE and ST_NOLOAD. |
798 | switch (script_section_type) | |
799 | { | |
800 | case Script_sections::ST_NONE: | |
801 | break; | |
802 | case Script_sections::ST_NOLOAD: | |
803 | flags &= elfcpp::SHF_ALLOC; | |
804 | break; | |
805 | default: | |
806 | gold_unreachable(); | |
807 | } | |
808 | ||
a445fddf ILT |
809 | // If this is an orphan section--one not mentioned in the linker |
810 | // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the | |
811 | // default processing below. | |
812 | ||
813 | if (output_section_slot != NULL) | |
814 | { | |
815 | if (*output_section_slot != NULL) | |
9c547ec3 ILT |
816 | { |
817 | (*output_section_slot)->update_flags_for_input_section(flags); | |
818 | return *output_section_slot; | |
819 | } | |
a445fddf ILT |
820 | |
821 | // We don't put sections found in the linker script into | |
822 | // SECTION_NAME_MAP_. That keeps us from getting confused | |
823 | // if an orphan section is mapped to a section with the same | |
824 | // name as one in the linker script. | |
825 | ||
826 | name = this->namepool_.add(name, false, NULL); | |
827 | ||
22f0da72 ILT |
828 | Output_section* os = this->make_output_section(name, type, flags, |
829 | order, is_relro); | |
830 | ||
a445fddf | 831 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
832 | |
833 | // Special handling for NOLOAD sections. | |
834 | if (script_section_type == Script_sections::ST_NOLOAD) | |
835 | { | |
836 | os->set_is_noload(); | |
837 | ||
838 | // The constructor of Output_section sets addresses of non-ALLOC | |
839 | // sections to 0 by default. We don't want that for NOLOAD | |
840 | // sections even if they have no SHF_ALLOC flag. | |
841 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0 | |
842 | && os->is_address_valid()) | |
843 | { | |
844 | gold_assert(os->address() == 0 | |
845 | && !os->is_offset_valid() | |
846 | && !os->is_data_size_valid()); | |
847 | os->reset_address_and_file_offset(); | |
848 | } | |
849 | } | |
850 | ||
a445fddf ILT |
851 | *output_section_slot = os; |
852 | return os; | |
853 | } | |
854 | } | |
855 | ||
856 | // FIXME: Handle SHF_OS_NONCONFORMING somewhere. | |
857 | ||
6fc6ea19 CC |
858 | size_t len = strlen(name); |
859 | char* uncompressed_name = NULL; | |
860 | ||
861 | // Compressed debug sections should be mapped to the corresponding | |
862 | // uncompressed section. | |
863 | if (is_compressed_debug_section(name)) | |
864 | { | |
865 | uncompressed_name = new char[len]; | |
866 | uncompressed_name[0] = '.'; | |
867 | gold_assert(name[0] == '.' && name[1] == 'z'); | |
868 | strncpy(&uncompressed_name[1], &name[2], len - 2); | |
869 | uncompressed_name[len - 1] = '\0'; | |
870 | len -= 1; | |
871 | name = uncompressed_name; | |
872 | } | |
873 | ||
a445fddf ILT |
874 | // Turn NAME from the name of the input section into the name of the |
875 | // output section. | |
401a9a73 CC |
876 | if (is_input_section |
877 | && !this->script_options_->saw_sections_clause() | |
878 | && !parameters->options().relocatable()) | |
5393d741 | 879 | name = Layout::output_section_name(relobj, name, &len); |
a445fddf ILT |
880 | |
881 | Stringpool::Key name_key; | |
882 | name = this->namepool_.add_with_length(name, len, true, &name_key); | |
883 | ||
6fc6ea19 CC |
884 | if (uncompressed_name != NULL) |
885 | delete[] uncompressed_name; | |
886 | ||
a445fddf ILT |
887 | // Find or make the output section. The output section is selected |
888 | // based on the section name, type, and flags. | |
22f0da72 | 889 | return this->get_output_section(name, name_key, type, flags, order, is_relro); |
a445fddf ILT |
890 | } |
891 | ||
cdc29364 CC |
892 | // For incremental links, record the initial fixed layout of a section |
893 | // from the base file, and return a pointer to the Output_section. | |
894 | ||
895 | template<int size, bool big_endian> | |
896 | Output_section* | |
897 | Layout::init_fixed_output_section(const char* name, | |
898 | elfcpp::Shdr<size, big_endian>& shdr) | |
899 | { | |
900 | unsigned int sh_type = shdr.get_sh_type(); | |
901 | ||
aa06ae28 CC |
902 | // We preserve the layout of PROGBITS, NOBITS, INIT_ARRAY, FINI_ARRAY, |
903 | // PRE_INIT_ARRAY, and NOTE sections. | |
cdc29364 | 904 | // All others will be created from scratch and reallocated. |
aa06ae28 | 905 | if (!can_incremental_update(sh_type)) |
cdc29364 CC |
906 | return NULL; |
907 | ||
908 | typename elfcpp::Elf_types<size>::Elf_Addr sh_addr = shdr.get_sh_addr(); | |
909 | typename elfcpp::Elf_types<size>::Elf_Off sh_offset = shdr.get_sh_offset(); | |
910 | typename elfcpp::Elf_types<size>::Elf_WXword sh_size = shdr.get_sh_size(); | |
911 | typename elfcpp::Elf_types<size>::Elf_WXword sh_flags = shdr.get_sh_flags(); | |
912 | typename elfcpp::Elf_types<size>::Elf_WXword sh_addralign = | |
913 | shdr.get_sh_addralign(); | |
914 | ||
915 | // Make the output section. | |
916 | Stringpool::Key name_key; | |
917 | name = this->namepool_.add(name, true, &name_key); | |
918 | Output_section* os = this->get_output_section(name, name_key, sh_type, | |
919 | sh_flags, ORDER_INVALID, false); | |
920 | os->set_fixed_layout(sh_addr, sh_offset, sh_size, sh_addralign); | |
921 | if (sh_type != elfcpp::SHT_NOBITS) | |
922 | this->free_list_.remove(sh_offset, sh_offset + sh_size); | |
923 | return os; | |
924 | } | |
925 | ||
ead1e424 | 926 | // Return the output section to use for input section SHNDX, with name |
730cdc88 ILT |
927 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
928 | // index of a relocation section which applies to this section, or 0 | |
929 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
930 | // relocation section if there is one. Set *OFF to the offset of this | |
931 | // input section without the output section. Return NULL if the | |
932 | // section should be discarded. Set *OFF to -1 if the section | |
933 | // contents should not be written directly to the output file, but | |
934 | // will instead receive special handling. | |
ead1e424 ILT |
935 | |
936 | template<int size, bool big_endian> | |
937 | Output_section* | |
6fa2a40b | 938 | Layout::layout(Sized_relobj_file<size, big_endian>* object, unsigned int shndx, |
730cdc88 ILT |
939 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, |
940 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 | 941 | { |
ef9beddf ILT |
942 | *off = 0; |
943 | ||
ead1e424 ILT |
944 | if (!this->include_section(object, name, shdr)) |
945 | return NULL; | |
946 | ||
2a0ff005 | 947 | elfcpp::Elf_Word sh_type = shdr.get_sh_type(); |
2a0ff005 | 948 | |
6a74a719 ILT |
949 | // In a relocatable link a grouped section must not be combined with |
950 | // any other sections. | |
5393d741 | 951 | Output_section* os; |
8851ecca | 952 | if (parameters->options().relocatable() |
6a74a719 ILT |
953 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
954 | { | |
955 | name = this->namepool_.add(name, true, NULL); | |
22f0da72 ILT |
956 | os = this->make_output_section(name, sh_type, shdr.get_sh_flags(), |
957 | ORDER_INVALID, false); | |
6a74a719 ILT |
958 | } |
959 | else | |
960 | { | |
2a0ff005 | 961 | os = this->choose_output_section(object, name, sh_type, |
22f0da72 ILT |
962 | shdr.get_sh_flags(), true, |
963 | ORDER_INVALID, false); | |
6a74a719 ILT |
964 | if (os == NULL) |
965 | return NULL; | |
966 | } | |
a2fb1b05 | 967 | |
2fd32231 | 968 | // By default the GNU linker sorts input sections whose names match |
487b39df ILT |
969 | // .ctors.*, .dtors.*, .init_array.*, or .fini_array.*. The |
970 | // sections are sorted by name. This is used to implement | |
971 | // constructor priority ordering. We are compatible. When we put | |
972 | // .ctor sections in .init_array and .dtor sections in .fini_array, | |
973 | // we must also sort plain .ctor and .dtor sections. | |
2fd32231 | 974 | if (!this->script_options_->saw_sections_clause() |
5393d741 | 975 | && !parameters->options().relocatable() |
2fd32231 ILT |
976 | && (is_prefix_of(".ctors.", name) |
977 | || is_prefix_of(".dtors.", name) | |
978 | || is_prefix_of(".init_array.", name) | |
5393d741 ILT |
979 | || is_prefix_of(".fini_array.", name) |
980 | || (parameters->options().ctors_in_init_array() | |
981 | && (strcmp(name, ".ctors") == 0 | |
982 | || strcmp(name, ".dtors") == 0)))) | |
2fd32231 ILT |
983 | os->set_must_sort_attached_input_sections(); |
984 | ||
487b39df ILT |
985 | // If this is a .ctors or .ctors.* section being mapped to a |
986 | // .init_array section, or a .dtors or .dtors.* section being mapped | |
987 | // to a .fini_array section, we will need to reverse the words if | |
988 | // there is more than one. Record this section for later. See | |
989 | // ctors_sections_in_init_array above. | |
990 | if (!this->script_options_->saw_sections_clause() | |
991 | && !parameters->options().relocatable() | |
992 | && shdr.get_sh_size() > size / 8 | |
993 | && (((strcmp(name, ".ctors") == 0 | |
994 | || is_prefix_of(".ctors.", name)) | |
995 | && strcmp(os->name(), ".init_array") == 0) | |
996 | || ((strcmp(name, ".dtors") == 0 | |
997 | || is_prefix_of(".dtors.", name)) | |
998 | && strcmp(os->name(), ".fini_array") == 0))) | |
999 | ctors_sections_in_init_array.insert(Section_id(object, shndx)); | |
1000 | ||
a2fb1b05 ILT |
1001 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
1002 | ||
5b7b7d6e ILT |
1003 | elfcpp::Elf_Xword orig_flags = os->flags(); |
1004 | ||
6e9ba2ca | 1005 | *off = os->add_input_section(this, object, shndx, name, shdr, reloc_shndx, |
a445fddf | 1006 | this->script_options_->saw_sections_clause()); |
5b7b7d6e ILT |
1007 | |
1008 | // If the flags changed, we may have to change the order. | |
1009 | if ((orig_flags & elfcpp::SHF_ALLOC) != 0) | |
1010 | { | |
1011 | orig_flags &= (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
1012 | elfcpp::Elf_Xword new_flags = | |
1013 | os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
1014 | if (orig_flags != new_flags) | |
1015 | os->set_order(this->default_section_order(os, false)); | |
1016 | } | |
1017 | ||
d7bb5745 | 1018 | this->have_added_input_section_ = true; |
a2fb1b05 ILT |
1019 | |
1020 | return os; | |
1021 | } | |
1022 | ||
6a74a719 ILT |
1023 | // Handle a relocation section when doing a relocatable link. |
1024 | ||
1025 | template<int size, bool big_endian> | |
1026 | Output_section* | |
6fa2a40b | 1027 | Layout::layout_reloc(Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
1028 | unsigned int, |
1029 | const elfcpp::Shdr<size, big_endian>& shdr, | |
1030 | Output_section* data_section, | |
1031 | Relocatable_relocs* rr) | |
1032 | { | |
8851ecca ILT |
1033 | gold_assert(parameters->options().relocatable() |
1034 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
1035 | |
1036 | int sh_type = shdr.get_sh_type(); | |
1037 | ||
1038 | std::string name; | |
1039 | if (sh_type == elfcpp::SHT_REL) | |
1040 | name = ".rel"; | |
1041 | else if (sh_type == elfcpp::SHT_RELA) | |
1042 | name = ".rela"; | |
1043 | else | |
1044 | gold_unreachable(); | |
1045 | name += data_section->name(); | |
1046 | ||
bd288ea2 ILT |
1047 | // In a relocatable link relocs for a grouped section must not be |
1048 | // combined with other reloc sections. | |
1049 | Output_section* os; | |
1050 | if (!parameters->options().relocatable() | |
1051 | || (data_section->flags() & elfcpp::SHF_GROUP) == 0) | |
1052 | os = this->choose_output_section(object, name.c_str(), sh_type, | |
22f0da72 ILT |
1053 | shdr.get_sh_flags(), false, |
1054 | ORDER_INVALID, false); | |
bd288ea2 ILT |
1055 | else |
1056 | { | |
1057 | const char* n = this->namepool_.add(name.c_str(), true, NULL); | |
1058 | os = this->make_output_section(n, sh_type, shdr.get_sh_flags(), | |
22f0da72 | 1059 | ORDER_INVALID, false); |
bd288ea2 | 1060 | } |
6a74a719 ILT |
1061 | |
1062 | os->set_should_link_to_symtab(); | |
1063 | os->set_info_section(data_section); | |
1064 | ||
1065 | Output_section_data* posd; | |
1066 | if (sh_type == elfcpp::SHT_REL) | |
1067 | { | |
1068 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); | |
1069 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, | |
1070 | size, | |
1071 | big_endian>(rr); | |
1072 | } | |
1073 | else if (sh_type == elfcpp::SHT_RELA) | |
1074 | { | |
1075 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); | |
1076 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, | |
1077 | size, | |
1078 | big_endian>(rr); | |
1079 | } | |
1080 | else | |
1081 | gold_unreachable(); | |
1082 | ||
1083 | os->add_output_section_data(posd); | |
1084 | rr->set_output_data(posd); | |
1085 | ||
1086 | return os; | |
1087 | } | |
1088 | ||
1089 | // Handle a group section when doing a relocatable link. | |
1090 | ||
1091 | template<int size, bool big_endian> | |
1092 | void | |
1093 | Layout::layout_group(Symbol_table* symtab, | |
6fa2a40b | 1094 | Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
1095 | unsigned int, |
1096 | const char* group_section_name, | |
1097 | const char* signature, | |
1098 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
1099 | elfcpp::Elf_Word flags, |
1100 | std::vector<unsigned int>* shndxes) | |
6a74a719 | 1101 | { |
8851ecca | 1102 | gold_assert(parameters->options().relocatable()); |
6a74a719 ILT |
1103 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
1104 | group_section_name = this->namepool_.add(group_section_name, true, NULL); | |
1105 | Output_section* os = this->make_output_section(group_section_name, | |
1106 | elfcpp::SHT_GROUP, | |
f5c870d2 | 1107 | shdr.get_sh_flags(), |
22f0da72 | 1108 | ORDER_INVALID, false); |
6a74a719 ILT |
1109 | |
1110 | // We need to find a symbol with the signature in the symbol table. | |
755ab8af | 1111 | // If we don't find one now, we need to look again later. |
6a74a719 | 1112 | Symbol* sym = symtab->lookup(signature, NULL); |
755ab8af ILT |
1113 | if (sym != NULL) |
1114 | os->set_info_symndx(sym); | |
1115 | else | |
1116 | { | |
e55bde5e ILT |
1117 | // Reserve some space to minimize reallocations. |
1118 | if (this->group_signatures_.empty()) | |
1119 | this->group_signatures_.reserve(this->number_of_input_files_ * 16); | |
1120 | ||
755ab8af ILT |
1121 | // We will wind up using a symbol whose name is the signature. |
1122 | // So just put the signature in the symbol name pool to save it. | |
1123 | signature = symtab->canonicalize_name(signature); | |
1124 | this->group_signatures_.push_back(Group_signature(os, signature)); | |
1125 | } | |
6a74a719 ILT |
1126 | |
1127 | os->set_should_link_to_symtab(); | |
6a74a719 ILT |
1128 | os->set_entsize(4); |
1129 | ||
1130 | section_size_type entry_count = | |
1131 | convert_to_section_size_type(shdr.get_sh_size() / 4); | |
1132 | Output_section_data* posd = | |
8825ac63 ILT |
1133 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
1134 | shndxes); | |
6a74a719 ILT |
1135 | os->add_output_section_data(posd); |
1136 | } | |
1137 | ||
730cdc88 ILT |
1138 | // Special GNU handling of sections name .eh_frame. They will |
1139 | // normally hold exception frame data as defined by the C++ ABI | |
1140 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
1141 | |
1142 | template<int size, bool big_endian> | |
730cdc88 | 1143 | Output_section* |
6fa2a40b | 1144 | Layout::layout_eh_frame(Sized_relobj_file<size, big_endian>* object, |
730cdc88 ILT |
1145 | const unsigned char* symbols, |
1146 | off_t symbols_size, | |
1147 | const unsigned char* symbol_names, | |
1148 | off_t symbol_names_size, | |
3151305a | 1149 | unsigned int shndx, |
3151305a | 1150 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
1151 | unsigned int reloc_shndx, unsigned int reloc_type, |
1152 | off_t* off) | |
3151305a | 1153 | { |
4d5e4e62 ILT |
1154 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS |
1155 | || shdr.get_sh_type() == elfcpp::SHT_X86_64_UNWIND); | |
1650c4ff | 1156 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 | 1157 | |
07a60597 | 1158 | Output_section* os = this->make_eh_frame_section(object); |
a445fddf ILT |
1159 | if (os == NULL) |
1160 | return NULL; | |
730cdc88 | 1161 | |
3151305a ILT |
1162 | gold_assert(this->eh_frame_section_ == os); |
1163 | ||
911a5072 ILT |
1164 | elfcpp::Elf_Xword orig_flags = os->flags(); |
1165 | ||
cdc29364 CC |
1166 | if (!parameters->incremental() |
1167 | && this->eh_frame_data_->add_ehframe_input_section(object, | |
1168 | symbols, | |
1169 | symbols_size, | |
1170 | symbol_names, | |
1171 | symbol_names_size, | |
1172 | shndx, | |
1173 | reloc_shndx, | |
1174 | reloc_type)) | |
2c38906f | 1175 | { |
154e0e9a ILT |
1176 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
1177 | ||
3bb951e5 | 1178 | // A writable .eh_frame section is a RELRO section. |
911a5072 ILT |
1179 | if ((orig_flags & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR)) |
1180 | != (os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR))) | |
1181 | { | |
1182 | os->set_is_relro(); | |
1183 | os->set_order(ORDER_RELRO); | |
1184 | } | |
3bb951e5 | 1185 | |
2c38906f ILT |
1186 | // We found a .eh_frame section we are going to optimize, so now |
1187 | // we can add the set of optimized sections to the output | |
1188 | // section. We need to postpone adding this until we've found a | |
1189 | // section we can optimize so that the .eh_frame section in | |
1190 | // crtbegin.o winds up at the start of the output section. | |
1191 | if (!this->added_eh_frame_data_) | |
1192 | { | |
1193 | os->add_output_section_data(this->eh_frame_data_); | |
1194 | this->added_eh_frame_data_ = true; | |
1195 | } | |
1196 | *off = -1; | |
1197 | } | |
730cdc88 ILT |
1198 | else |
1199 | { | |
1200 | // We couldn't handle this .eh_frame section for some reason. | |
1201 | // Add it as a normal section. | |
a445fddf | 1202 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); |
07a60597 ILT |
1203 | *off = os->add_input_section(this, object, shndx, ".eh_frame", shdr, |
1204 | reloc_shndx, saw_sections_clause); | |
d7bb5745 | 1205 | this->have_added_input_section_ = true; |
911a5072 ILT |
1206 | |
1207 | if ((orig_flags & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR)) | |
1208 | != (os->flags() & (elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR))) | |
1209 | os->set_order(this->default_section_order(os, false)); | |
730cdc88 ILT |
1210 | } |
1211 | ||
1212 | return os; | |
3151305a ILT |
1213 | } |
1214 | ||
07a60597 ILT |
1215 | // Create and return the magic .eh_frame section. Create |
1216 | // .eh_frame_hdr also if appropriate. OBJECT is the object with the | |
1217 | // input .eh_frame section; it may be NULL. | |
1218 | ||
1219 | Output_section* | |
1220 | Layout::make_eh_frame_section(const Relobj* object) | |
1221 | { | |
1222 | // FIXME: On x86_64, this could use SHT_X86_64_UNWIND rather than | |
1223 | // SHT_PROGBITS. | |
1224 | Output_section* os = this->choose_output_section(object, ".eh_frame", | |
1225 | elfcpp::SHT_PROGBITS, | |
1226 | elfcpp::SHF_ALLOC, false, | |
1227 | ORDER_EHFRAME, false); | |
1228 | if (os == NULL) | |
1229 | return NULL; | |
1230 | ||
1231 | if (this->eh_frame_section_ == NULL) | |
1232 | { | |
1233 | this->eh_frame_section_ = os; | |
1234 | this->eh_frame_data_ = new Eh_frame(); | |
1235 | ||
1236 | // For incremental linking, we do not optimize .eh_frame sections | |
1237 | // or create a .eh_frame_hdr section. | |
1238 | if (parameters->options().eh_frame_hdr() && !parameters->incremental()) | |
1239 | { | |
1240 | Output_section* hdr_os = | |
1241 | this->choose_output_section(NULL, ".eh_frame_hdr", | |
1242 | elfcpp::SHT_PROGBITS, | |
1243 | elfcpp::SHF_ALLOC, false, | |
1244 | ORDER_EHFRAME, false); | |
1245 | ||
1246 | if (hdr_os != NULL) | |
1247 | { | |
1248 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, | |
1249 | this->eh_frame_data_); | |
1250 | hdr_os->add_output_section_data(hdr_posd); | |
1251 | ||
1252 | hdr_os->set_after_input_sections(); | |
1253 | ||
1254 | if (!this->script_options_->saw_phdrs_clause()) | |
1255 | { | |
1256 | Output_segment* hdr_oseg; | |
1257 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, | |
1258 | elfcpp::PF_R); | |
1259 | hdr_oseg->add_output_section_to_nonload(hdr_os, | |
1260 | elfcpp::PF_R); | |
1261 | } | |
1262 | ||
1263 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); | |
1264 | } | |
1265 | } | |
1266 | } | |
1267 | ||
1268 | return os; | |
1269 | } | |
1270 | ||
1271 | // Add an exception frame for a PLT. This is called from target code. | |
1272 | ||
1273 | void | |
1274 | Layout::add_eh_frame_for_plt(Output_data* plt, const unsigned char* cie_data, | |
1275 | size_t cie_length, const unsigned char* fde_data, | |
1276 | size_t fde_length) | |
1277 | { | |
1278 | if (parameters->incremental()) | |
1279 | { | |
1280 | // FIXME: Maybe this could work some day.... | |
1281 | return; | |
1282 | } | |
1283 | Output_section* os = this->make_eh_frame_section(NULL); | |
1284 | if (os == NULL) | |
1285 | return; | |
1286 | this->eh_frame_data_->add_ehframe_for_plt(plt, cie_data, cie_length, | |
1287 | fde_data, fde_length); | |
1288 | if (!this->added_eh_frame_data_) | |
1289 | { | |
1290 | os->add_output_section_data(this->eh_frame_data_); | |
1291 | this->added_eh_frame_data_ = true; | |
1292 | } | |
1293 | } | |
1294 | ||
9f1d377b ILT |
1295 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
1296 | // the output section. | |
ead1e424 | 1297 | |
9f1d377b | 1298 | Output_section* |
ead1e424 ILT |
1299 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
1300 | elfcpp::Elf_Xword flags, | |
f5c870d2 | 1301 | Output_section_data* posd, |
22f0da72 | 1302 | Output_section_order order, bool is_relro) |
ead1e424 | 1303 | { |
a445fddf | 1304 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
22f0da72 | 1305 | false, order, is_relro); |
a445fddf ILT |
1306 | if (os != NULL) |
1307 | os->add_output_section_data(posd); | |
9f1d377b | 1308 | return os; |
ead1e424 ILT |
1309 | } |
1310 | ||
a2fb1b05 ILT |
1311 | // Map section flags to segment flags. |
1312 | ||
1313 | elfcpp::Elf_Word | |
1314 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
1315 | { | |
1316 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
1317 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
1318 | ret |= elfcpp::PF_W; | |
1319 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
1320 | ret |= elfcpp::PF_X; | |
1321 | return ret; | |
1322 | } | |
1323 | ||
1324 | // Make a new Output_section, and attach it to segments as | |
22f0da72 ILT |
1325 | // appropriate. ORDER is the order in which this section should |
1326 | // appear in the output segment. IS_RELRO is true if this is a relro | |
1327 | // (read-only after relocations) section. | |
a2fb1b05 ILT |
1328 | |
1329 | Output_section* | |
1330 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
22f0da72 ILT |
1331 | elfcpp::Elf_Xword flags, |
1332 | Output_section_order order, bool is_relro) | |
a2fb1b05 | 1333 | { |
96803768 ILT |
1334 | Output_section* os; |
1335 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 1336 | && strcmp(parameters->options().compress_debug_sections(), "none") != 0 |
96803768 | 1337 | && is_compressible_debug_section(name)) |
e55bde5e ILT |
1338 | os = new Output_compressed_section(¶meters->options(), name, type, |
1339 | flags); | |
62b01cb5 | 1340 | else if ((flags & elfcpp::SHF_ALLOC) == 0 |
e55bde5e | 1341 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
1342 | && strcmp(".debug_abbrev", name) == 0) |
1343 | { | |
1344 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( | |
1345 | name, type, flags); | |
1346 | if (this->debug_info_) | |
1347 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
1348 | } | |
1349 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 1350 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
1351 | && strcmp(".debug_info", name) == 0) |
1352 | { | |
1353 | os = this->debug_info_ = new Output_reduced_debug_info_section( | |
1354 | name, type, flags); | |
1355 | if (this->debug_abbrev_) | |
1356 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
1357 | } | |
09ec0418 | 1358 | else |
c0a62865 | 1359 | { |
5393d741 ILT |
1360 | // Sometimes .init_array*, .preinit_array* and .fini_array* do |
1361 | // not have correct section types. Force them here. | |
1362 | if (type == elfcpp::SHT_PROGBITS) | |
1363 | { | |
1364 | if (is_prefix_of(".init_array", name)) | |
1365 | type = elfcpp::SHT_INIT_ARRAY; | |
1366 | else if (is_prefix_of(".preinit_array", name)) | |
1367 | type = elfcpp::SHT_PREINIT_ARRAY; | |
1368 | else if (is_prefix_of(".fini_array", name)) | |
1369 | type = elfcpp::SHT_FINI_ARRAY; | |
1370 | } | |
1371 | ||
c0a62865 DK |
1372 | // FIXME: const_cast is ugly. |
1373 | Target* target = const_cast<Target*>(¶meters->target()); | |
1374 | os = target->make_output_section(name, type, flags); | |
1375 | } | |
96803768 | 1376 | |
22f0da72 ILT |
1377 | // With -z relro, we have to recognize the special sections by name. |
1378 | // There is no other way. | |
1379 | bool is_relro_local = false; | |
1380 | if (!this->script_options_->saw_sections_clause() | |
1381 | && parameters->options().relro() | |
22f0da72 ILT |
1382 | && (flags & elfcpp::SHF_ALLOC) != 0 |
1383 | && (flags & elfcpp::SHF_WRITE) != 0) | |
1384 | { | |
14dc9ef7 | 1385 | if (type == elfcpp::SHT_PROGBITS) |
22f0da72 | 1386 | { |
14dc9ef7 ILT |
1387 | if (strcmp(name, ".data.rel.ro") == 0) |
1388 | is_relro = true; | |
1389 | else if (strcmp(name, ".data.rel.ro.local") == 0) | |
1390 | { | |
1391 | is_relro = true; | |
1392 | is_relro_local = true; | |
1393 | } | |
1394 | else if (strcmp(name, ".ctors") == 0 | |
1395 | || strcmp(name, ".dtors") == 0 | |
1396 | || strcmp(name, ".jcr") == 0) | |
1397 | is_relro = true; | |
22f0da72 ILT |
1398 | } |
1399 | else if (type == elfcpp::SHT_INIT_ARRAY | |
1400 | || type == elfcpp::SHT_FINI_ARRAY | |
1401 | || type == elfcpp::SHT_PREINIT_ARRAY) | |
1402 | is_relro = true; | |
22f0da72 ILT |
1403 | } |
1404 | ||
1a2dff53 ILT |
1405 | if (is_relro) |
1406 | os->set_is_relro(); | |
22f0da72 ILT |
1407 | |
1408 | if (order == ORDER_INVALID && (flags & elfcpp::SHF_ALLOC) != 0) | |
1409 | order = this->default_section_order(os, is_relro_local); | |
1410 | ||
1411 | os->set_order(order); | |
f5c870d2 | 1412 | |
8a5e3e08 ILT |
1413 | parameters->target().new_output_section(os); |
1414 | ||
a3ad94ed | 1415 | this->section_list_.push_back(os); |
a2fb1b05 | 1416 | |
2fd32231 ILT |
1417 | // The GNU linker by default sorts some sections by priority, so we |
1418 | // do the same. We need to know that this might happen before we | |
1419 | // attach any input sections. | |
1420 | if (!this->script_options_->saw_sections_clause() | |
5393d741 ILT |
1421 | && !parameters->options().relocatable() |
1422 | && (strcmp(name, ".init_array") == 0 | |
1423 | || strcmp(name, ".fini_array") == 0 | |
1424 | || (!parameters->options().ctors_in_init_array() | |
1425 | && (strcmp(name, ".ctors") == 0 | |
1426 | || strcmp(name, ".dtors") == 0)))) | |
2fd32231 ILT |
1427 | os->set_may_sort_attached_input_sections(); |
1428 | ||
1518dc8f ILT |
1429 | // Check for .stab*str sections, as .stab* sections need to link to |
1430 | // them. | |
1431 | if (type == elfcpp::SHT_STRTAB | |
1432 | && !this->have_stabstr_section_ | |
1433 | && strncmp(name, ".stab", 5) == 0 | |
1434 | && strcmp(name + strlen(name) - 3, "str") == 0) | |
1435 | this->have_stabstr_section_ = true; | |
1436 | ||
9fbd3822 CC |
1437 | // During a full incremental link, we add patch space to most |
1438 | // PROGBITS and NOBITS sections. Flag those that may be | |
1439 | // arbitrarily padded. | |
1440 | if ((type == elfcpp::SHT_PROGBITS || type == elfcpp::SHT_NOBITS) | |
1441 | && order != ORDER_INTERP | |
1442 | && order != ORDER_INIT | |
1443 | && order != ORDER_PLT | |
1444 | && order != ORDER_FINI | |
1445 | && order != ORDER_RELRO_LAST | |
1446 | && order != ORDER_NON_RELRO_FIRST | |
aa06ae28 | 1447 | && strcmp(name, ".eh_frame") != 0 |
9fbd3822 CC |
1448 | && strcmp(name, ".ctors") != 0 |
1449 | && strcmp(name, ".dtors") != 0 | |
1450 | && strcmp(name, ".jcr") != 0) | |
8ea8cd50 CC |
1451 | { |
1452 | os->set_is_patch_space_allowed(); | |
1453 | ||
1454 | // Certain sections require "holes" to be filled with | |
1455 | // specific fill patterns. These fill patterns may have | |
1456 | // a minimum size, so we must prevent allocations from the | |
1457 | // free list that leave a hole smaller than the minimum. | |
1458 | if (strcmp(name, ".debug_info") == 0) | |
1459 | os->set_free_space_fill(new Output_fill_debug_info(false)); | |
1460 | else if (strcmp(name, ".debug_types") == 0) | |
1461 | os->set_free_space_fill(new Output_fill_debug_info(true)); | |
1462 | else if (strcmp(name, ".debug_line") == 0) | |
1463 | os->set_free_space_fill(new Output_fill_debug_line()); | |
1464 | } | |
9fbd3822 | 1465 | |
154e0e9a ILT |
1466 | // If we have already attached the sections to segments, then we |
1467 | // need to attach this one now. This happens for sections created | |
1468 | // directly by the linker. | |
1469 | if (this->sections_are_attached_) | |
1470 | this->attach_section_to_segment(os); | |
1471 | ||
4e2b1697 ILT |
1472 | return os; |
1473 | } | |
a445fddf | 1474 | |
22f0da72 ILT |
1475 | // Return the default order in which a section should be placed in an |
1476 | // output segment. This function captures a lot of the ideas in | |
1477 | // ld/scripttempl/elf.sc in the GNU linker. Note that the order of a | |
1478 | // linker created section is normally set when the section is created; | |
1479 | // this function is used for input sections. | |
1480 | ||
1481 | Output_section_order | |
1482 | Layout::default_section_order(Output_section* os, bool is_relro_local) | |
1483 | { | |
1484 | gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0); | |
1485 | bool is_write = (os->flags() & elfcpp::SHF_WRITE) != 0; | |
1486 | bool is_execinstr = (os->flags() & elfcpp::SHF_EXECINSTR) != 0; | |
1487 | bool is_bss = false; | |
1488 | ||
1489 | switch (os->type()) | |
1490 | { | |
1491 | default: | |
1492 | case elfcpp::SHT_PROGBITS: | |
1493 | break; | |
1494 | case elfcpp::SHT_NOBITS: | |
1495 | is_bss = true; | |
1496 | break; | |
1497 | case elfcpp::SHT_RELA: | |
1498 | case elfcpp::SHT_REL: | |
1499 | if (!is_write) | |
1500 | return ORDER_DYNAMIC_RELOCS; | |
1501 | break; | |
1502 | case elfcpp::SHT_HASH: | |
1503 | case elfcpp::SHT_DYNAMIC: | |
1504 | case elfcpp::SHT_SHLIB: | |
1505 | case elfcpp::SHT_DYNSYM: | |
1506 | case elfcpp::SHT_GNU_HASH: | |
1507 | case elfcpp::SHT_GNU_verdef: | |
1508 | case elfcpp::SHT_GNU_verneed: | |
1509 | case elfcpp::SHT_GNU_versym: | |
1510 | if (!is_write) | |
1511 | return ORDER_DYNAMIC_LINKER; | |
1512 | break; | |
1513 | case elfcpp::SHT_NOTE: | |
1514 | return is_write ? ORDER_RW_NOTE : ORDER_RO_NOTE; | |
1515 | } | |
1516 | ||
1517 | if ((os->flags() & elfcpp::SHF_TLS) != 0) | |
1518 | return is_bss ? ORDER_TLS_BSS : ORDER_TLS_DATA; | |
1519 | ||
1520 | if (!is_bss && !is_write) | |
1521 | { | |
1522 | if (is_execinstr) | |
1523 | { | |
1524 | if (strcmp(os->name(), ".init") == 0) | |
1525 | return ORDER_INIT; | |
1526 | else if (strcmp(os->name(), ".fini") == 0) | |
1527 | return ORDER_FINI; | |
1528 | } | |
1529 | return is_execinstr ? ORDER_TEXT : ORDER_READONLY; | |
1530 | } | |
1531 | ||
1532 | if (os->is_relro()) | |
1533 | return is_relro_local ? ORDER_RELRO_LOCAL : ORDER_RELRO; | |
1534 | ||
1535 | if (os->is_small_section()) | |
1536 | return is_bss ? ORDER_SMALL_BSS : ORDER_SMALL_DATA; | |
1537 | if (os->is_large_section()) | |
1538 | return is_bss ? ORDER_LARGE_BSS : ORDER_LARGE_DATA; | |
1539 | ||
1540 | return is_bss ? ORDER_BSS : ORDER_DATA; | |
1541 | } | |
1542 | ||
154e0e9a ILT |
1543 | // Attach output sections to segments. This is called after we have |
1544 | // seen all the input sections. | |
1545 | ||
1546 | void | |
1547 | Layout::attach_sections_to_segments() | |
1548 | { | |
1549 | for (Section_list::iterator p = this->section_list_.begin(); | |
1550 | p != this->section_list_.end(); | |
1551 | ++p) | |
1552 | this->attach_section_to_segment(*p); | |
1553 | ||
1554 | this->sections_are_attached_ = true; | |
1555 | } | |
1556 | ||
1557 | // Attach an output section to a segment. | |
1558 | ||
1559 | void | |
1560 | Layout::attach_section_to_segment(Output_section* os) | |
1561 | { | |
1562 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
1563 | this->unattached_section_list_.push_back(os); | |
1564 | else | |
1565 | this->attach_allocated_section_to_segment(os); | |
1566 | } | |
1567 | ||
4e2b1697 | 1568 | // Attach an allocated output section to a segment. |
1c4f3631 | 1569 | |
4e2b1697 | 1570 | void |
154e0e9a | 1571 | Layout::attach_allocated_section_to_segment(Output_section* os) |
4e2b1697 | 1572 | { |
154e0e9a | 1573 | elfcpp::Elf_Xword flags = os->flags(); |
4e2b1697 | 1574 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
a2fb1b05 | 1575 | |
4e2b1697 ILT |
1576 | if (parameters->options().relocatable()) |
1577 | return; | |
a2fb1b05 | 1578 | |
4e2b1697 ILT |
1579 | // If we have a SECTIONS clause, we can't handle the attachment to |
1580 | // segments until after we've seen all the sections. | |
1581 | if (this->script_options_->saw_sections_clause()) | |
1582 | return; | |
a2fb1b05 | 1583 | |
4e2b1697 | 1584 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
756ac4a8 | 1585 | |
4e2b1697 | 1586 | // This output section goes into a PT_LOAD segment. |
a2fb1b05 | 1587 | |
4e2b1697 | 1588 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
a2fb1b05 | 1589 | |
a192ba05 ILT |
1590 | // Check for --section-start. |
1591 | uint64_t addr; | |
1592 | bool is_address_set = parameters->options().section_start(os->name(), &addr); | |
f5c870d2 | 1593 | |
4e2b1697 | 1594 | // In general the only thing we really care about for PT_LOAD |
0f72bf6f RÁE |
1595 | // segments is whether or not they are writable or executable, |
1596 | // so that is how we search for them. | |
1597 | // Large data sections also go into their own PT_LOAD segment. | |
1598 | // People who need segments sorted on some other basis will | |
1599 | // have to use a linker script. | |
a2fb1b05 | 1600 | |
4e2b1697 ILT |
1601 | Segment_list::const_iterator p; |
1602 | for (p = this->segment_list_.begin(); | |
1603 | p != this->segment_list_.end(); | |
1604 | ++p) | |
1605 | { | |
8a5e3e08 ILT |
1606 | if ((*p)->type() != elfcpp::PT_LOAD) |
1607 | continue; | |
1608 | if (!parameters->options().omagic() | |
1609 | && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W)) | |
1610 | continue; | |
0f72bf6f RÁE |
1611 | if (parameters->options().rosegment() |
1612 | && ((*p)->flags() & elfcpp::PF_X) != (seg_flags & elfcpp::PF_X)) | |
1613 | continue; | |
8a5e3e08 ILT |
1614 | // If -Tbss was specified, we need to separate the data and BSS |
1615 | // segments. | |
1616 | if (parameters->options().user_set_Tbss()) | |
1617 | { | |
1618 | if ((os->type() == elfcpp::SHT_NOBITS) | |
1619 | == (*p)->has_any_data_sections()) | |
1620 | continue; | |
1621 | } | |
1622 | if (os->is_large_data_section() && !(*p)->is_large_data_segment()) | |
1623 | continue; | |
4e2b1697 | 1624 | |
a192ba05 ILT |
1625 | if (is_address_set) |
1626 | { | |
1627 | if ((*p)->are_addresses_set()) | |
1628 | continue; | |
1629 | ||
1630 | (*p)->add_initial_output_data(os); | |
1631 | (*p)->update_flags_for_output_section(seg_flags); | |
1632 | (*p)->set_addresses(addr, addr); | |
1633 | break; | |
1634 | } | |
1635 | ||
22f0da72 | 1636 | (*p)->add_output_section_to_load(this, os, seg_flags); |
8a5e3e08 | 1637 | break; |
4e2b1697 | 1638 | } |
54dc6425 | 1639 | |
4e2b1697 ILT |
1640 | if (p == this->segment_list_.end()) |
1641 | { | |
1642 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, | |
1643 | seg_flags); | |
8a5e3e08 ILT |
1644 | if (os->is_large_data_section()) |
1645 | oseg->set_is_large_data_segment(); | |
22f0da72 | 1646 | oseg->add_output_section_to_load(this, os, seg_flags); |
a192ba05 ILT |
1647 | if (is_address_set) |
1648 | oseg->set_addresses(addr, addr); | |
a2fb1b05 ILT |
1649 | } |
1650 | ||
4e2b1697 ILT |
1651 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
1652 | // segment. | |
1653 | if (os->type() == elfcpp::SHT_NOTE) | |
1654 | { | |
1655 | // See if we already have an equivalent PT_NOTE segment. | |
1656 | for (p = this->segment_list_.begin(); | |
1657 | p != segment_list_.end(); | |
1658 | ++p) | |
1659 | { | |
1660 | if ((*p)->type() == elfcpp::PT_NOTE | |
1661 | && (((*p)->flags() & elfcpp::PF_W) | |
1662 | == (seg_flags & elfcpp::PF_W))) | |
1663 | { | |
22f0da72 | 1664 | (*p)->add_output_section_to_nonload(os, seg_flags); |
4e2b1697 ILT |
1665 | break; |
1666 | } | |
1667 | } | |
1668 | ||
1669 | if (p == this->segment_list_.end()) | |
1670 | { | |
1671 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, | |
1672 | seg_flags); | |
22f0da72 | 1673 | oseg->add_output_section_to_nonload(os, seg_flags); |
4e2b1697 ILT |
1674 | } |
1675 | } | |
1676 | ||
1677 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
1678 | // segment. There can only be one such segment. | |
1679 | if ((flags & elfcpp::SHF_TLS) != 0) | |
1680 | { | |
1681 | if (this->tls_segment_ == NULL) | |
2d924fd9 | 1682 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
22f0da72 | 1683 | this->tls_segment_->add_output_section_to_nonload(os, seg_flags); |
4e2b1697 | 1684 | } |
9f1d377b ILT |
1685 | |
1686 | // If -z relro is in effect, and we see a relro section, we create a | |
1687 | // PT_GNU_RELRO segment. There can only be one such segment. | |
1688 | if (os->is_relro() && parameters->options().relro()) | |
1689 | { | |
1690 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); | |
1691 | if (this->relro_segment_ == NULL) | |
2d924fd9 | 1692 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
22f0da72 | 1693 | this->relro_segment_->add_output_section_to_nonload(os, seg_flags); |
9f1d377b | 1694 | } |
10b4f102 | 1695 | |
e1f74f98 ILT |
1696 | // If we see a section named .interp, put it into a PT_INTERP |
1697 | // segment. This seems broken to me, but this is what GNU ld does, | |
1698 | // and glibc expects it. | |
10b4f102 | 1699 | if (strcmp(os->name(), ".interp") == 0 |
e1f74f98 | 1700 | && !this->script_options_->saw_phdrs_clause()) |
10b4f102 ILT |
1701 | { |
1702 | if (this->interp_segment_ == NULL) | |
1703 | this->make_output_segment(elfcpp::PT_INTERP, seg_flags); | |
e1f74f98 ILT |
1704 | else |
1705 | gold_warning(_("multiple '.interp' sections in input files " | |
1706 | "may cause confusing PT_INTERP segment")); | |
10b4f102 ILT |
1707 | this->interp_segment_->add_output_section_to_nonload(os, seg_flags); |
1708 | } | |
a2fb1b05 ILT |
1709 | } |
1710 | ||
919ed24c ILT |
1711 | // Make an output section for a script. |
1712 | ||
1713 | Output_section* | |
1e5d2fb1 DK |
1714 | Layout::make_output_section_for_script( |
1715 | const char* name, | |
1716 | Script_sections::Section_type section_type) | |
919ed24c ILT |
1717 | { |
1718 | name = this->namepool_.add(name, false, NULL); | |
1e5d2fb1 DK |
1719 | elfcpp::Elf_Xword sh_flags = elfcpp::SHF_ALLOC; |
1720 | if (section_type == Script_sections::ST_NOLOAD) | |
1721 | sh_flags = 0; | |
919ed24c | 1722 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, |
22f0da72 ILT |
1723 | sh_flags, ORDER_INVALID, |
1724 | false); | |
919ed24c | 1725 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
1726 | if (section_type == Script_sections::ST_NOLOAD) |
1727 | os->set_is_noload(); | |
919ed24c ILT |
1728 | return os; |
1729 | } | |
1730 | ||
3802b2dd ILT |
1731 | // Return the number of segments we expect to see. |
1732 | ||
1733 | size_t | |
1734 | Layout::expected_segment_count() const | |
1735 | { | |
1736 | size_t ret = this->segment_list_.size(); | |
1737 | ||
1738 | // If we didn't see a SECTIONS clause in a linker script, we should | |
1739 | // already have the complete list of segments. Otherwise we ask the | |
1740 | // SECTIONS clause how many segments it expects, and add in the ones | |
1741 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) | |
1742 | ||
1743 | if (!this->script_options_->saw_sections_clause()) | |
1744 | return ret; | |
1745 | else | |
1746 | { | |
1747 | const Script_sections* ss = this->script_options_->script_sections(); | |
1748 | return ret + ss->expected_segment_count(this); | |
1749 | } | |
1750 | } | |
1751 | ||
35cdfc9a ILT |
1752 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
1753 | // is whether we saw a .note.GNU-stack section in the object file. | |
1754 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
1755 | // protection required for stack memory. We record this in an | |
1756 | // executable as a PT_GNU_STACK segment. If an object file does not | |
1757 | // have a .note.GNU-stack segment, we must assume that it is an old | |
1758 | // object. On some targets that will force an executable stack. | |
1759 | ||
1760 | void | |
83e17bd5 CC |
1761 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags, |
1762 | const Object* obj) | |
35cdfc9a ILT |
1763 | { |
1764 | if (!seen_gnu_stack) | |
83e17bd5 CC |
1765 | { |
1766 | this->input_without_gnu_stack_note_ = true; | |
1767 | if (parameters->options().warn_execstack() | |
1768 | && parameters->target().is_default_stack_executable()) | |
1769 | gold_warning(_("%s: missing .note.GNU-stack section" | |
1770 | " implies executable stack"), | |
1771 | obj->name().c_str()); | |
1772 | } | |
35cdfc9a ILT |
1773 | else |
1774 | { | |
1775 | this->input_with_gnu_stack_note_ = true; | |
1776 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
83e17bd5 CC |
1777 | { |
1778 | this->input_requires_executable_stack_ = true; | |
1779 | if (parameters->options().warn_execstack() | |
1780 | || parameters->options().is_stack_executable()) | |
1781 | gold_warning(_("%s: requires executable stack"), | |
1782 | obj->name().c_str()); | |
1783 | } | |
35cdfc9a ILT |
1784 | } |
1785 | } | |
1786 | ||
9c547ec3 ILT |
1787 | // Create automatic note sections. |
1788 | ||
1789 | void | |
1790 | Layout::create_notes() | |
1791 | { | |
1792 | this->create_gold_note(); | |
1793 | this->create_executable_stack_info(); | |
1794 | this->create_build_id(); | |
1795 | } | |
1796 | ||
a3ad94ed ILT |
1797 | // Create the dynamic sections which are needed before we read the |
1798 | // relocs. | |
1799 | ||
1800 | void | |
9b07f471 | 1801 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
a3ad94ed | 1802 | { |
436ca963 | 1803 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
1804 | return; |
1805 | ||
3802b2dd ILT |
1806 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
1807 | elfcpp::SHT_DYNAMIC, | |
1808 | (elfcpp::SHF_ALLOC | |
1809 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
1810 | false, ORDER_RELRO, |
1811 | true); | |
a3ad94ed | 1812 | |
6daf5215 ILT |
1813 | // A linker script may discard .dynamic, so check for NULL. |
1814 | if (this->dynamic_section_ != NULL) | |
1815 | { | |
1816 | this->dynamic_symbol_ = | |
1817 | symtab->define_in_output_data("_DYNAMIC", NULL, | |
1818 | Symbol_table::PREDEFINED, | |
1819 | this->dynamic_section_, 0, 0, | |
1820 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, | |
1821 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 1822 | |
6daf5215 | 1823 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 | 1824 | |
6daf5215 ILT |
1825 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); |
1826 | } | |
a3ad94ed ILT |
1827 | } |
1828 | ||
bfd58944 ILT |
1829 | // For each output section whose name can be represented as C symbol, |
1830 | // define __start and __stop symbols for the section. This is a GNU | |
1831 | // extension. | |
1832 | ||
1833 | void | |
9b07f471 | 1834 | Layout::define_section_symbols(Symbol_table* symtab) |
bfd58944 ILT |
1835 | { |
1836 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1837 | p != this->section_list_.end(); | |
1838 | ++p) | |
1839 | { | |
1840 | const char* const name = (*p)->name(); | |
f1ec9ded | 1841 | if (is_cident(name)) |
bfd58944 ILT |
1842 | { |
1843 | const std::string name_string(name); | |
f1ec9ded ST |
1844 | const std::string start_name(cident_section_start_prefix |
1845 | + name_string); | |
1846 | const std::string stop_name(cident_section_stop_prefix | |
1847 | + name_string); | |
bfd58944 | 1848 | |
9b07f471 | 1849 | symtab->define_in_output_data(start_name.c_str(), |
bfd58944 | 1850 | NULL, // version |
99fff23b | 1851 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
1852 | *p, |
1853 | 0, // value | |
1854 | 0, // symsize | |
1855 | elfcpp::STT_NOTYPE, | |
1856 | elfcpp::STB_GLOBAL, | |
1857 | elfcpp::STV_DEFAULT, | |
1858 | 0, // nonvis | |
1859 | false, // offset_is_from_end | |
a445fddf | 1860 | true); // only_if_ref |
bfd58944 | 1861 | |
9b07f471 | 1862 | symtab->define_in_output_data(stop_name.c_str(), |
bfd58944 | 1863 | NULL, // version |
99fff23b | 1864 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
1865 | *p, |
1866 | 0, // value | |
1867 | 0, // symsize | |
1868 | elfcpp::STT_NOTYPE, | |
1869 | elfcpp::STB_GLOBAL, | |
1870 | elfcpp::STV_DEFAULT, | |
1871 | 0, // nonvis | |
1872 | true, // offset_is_from_end | |
a445fddf | 1873 | true); // only_if_ref |
bfd58944 ILT |
1874 | } |
1875 | } | |
1876 | } | |
1877 | ||
755ab8af ILT |
1878 | // Define symbols for group signatures. |
1879 | ||
1880 | void | |
1881 | Layout::define_group_signatures(Symbol_table* symtab) | |
1882 | { | |
1883 | for (Group_signatures::iterator p = this->group_signatures_.begin(); | |
1884 | p != this->group_signatures_.end(); | |
1885 | ++p) | |
1886 | { | |
1887 | Symbol* sym = symtab->lookup(p->signature, NULL); | |
1888 | if (sym != NULL) | |
1889 | p->section->set_info_symndx(sym); | |
1890 | else | |
1891 | { | |
1892 | // Force the name of the group section to the group | |
1893 | // signature, and use the group's section symbol as the | |
1894 | // signature symbol. | |
1895 | if (strcmp(p->section->name(), p->signature) != 0) | |
1896 | { | |
1897 | const char* name = this->namepool_.add(p->signature, | |
1898 | true, NULL); | |
1899 | p->section->set_name(name); | |
1900 | } | |
1901 | p->section->set_needs_symtab_index(); | |
1902 | p->section->set_info_section_symndx(p->section); | |
1903 | } | |
1904 | } | |
1905 | ||
1906 | this->group_signatures_.clear(); | |
1907 | } | |
1908 | ||
75f65a3e ILT |
1909 | // Find the first read-only PT_LOAD segment, creating one if |
1910 | // necessary. | |
54dc6425 | 1911 | |
75f65a3e ILT |
1912 | Output_segment* |
1913 | Layout::find_first_load_seg() | |
54dc6425 | 1914 | { |
0f72bf6f | 1915 | Output_segment* best = NULL; |
75f65a3e ILT |
1916 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
1917 | p != this->segment_list_.end(); | |
1918 | ++p) | |
1919 | { | |
1920 | if ((*p)->type() == elfcpp::PT_LOAD | |
1921 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
af6156ef ILT |
1922 | && (parameters->options().omagic() |
1923 | || ((*p)->flags() & elfcpp::PF_W) == 0)) | |
0f72bf6f RÁE |
1924 | { |
1925 | if (best == NULL || this->segment_precedes(*p, best)) | |
1926 | best = *p; | |
1927 | } | |
75f65a3e | 1928 | } |
0f72bf6f RÁE |
1929 | if (best != NULL) |
1930 | return best; | |
75f65a3e | 1931 | |
1c4f3631 ILT |
1932 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
1933 | ||
3802b2dd ILT |
1934 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
1935 | elfcpp::PF_R); | |
75f65a3e | 1936 | return load_seg; |
54dc6425 ILT |
1937 | } |
1938 | ||
20e6d0d6 DK |
1939 | // Save states of all current output segments. Store saved states |
1940 | // in SEGMENT_STATES. | |
1941 | ||
1942 | void | |
1943 | Layout::save_segments(Segment_states* segment_states) | |
1944 | { | |
1945 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
1946 | p != this->segment_list_.end(); | |
1947 | ++p) | |
1948 | { | |
1949 | Output_segment* segment = *p; | |
1950 | // Shallow copy. | |
1951 | Output_segment* copy = new Output_segment(*segment); | |
1952 | (*segment_states)[segment] = copy; | |
1953 | } | |
1954 | } | |
1955 | ||
1956 | // Restore states of output segments and delete any segment not found in | |
1957 | // SEGMENT_STATES. | |
1958 | ||
1959 | void | |
1960 | Layout::restore_segments(const Segment_states* segment_states) | |
1961 | { | |
1962 | // Go through the segment list and remove any segment added in the | |
1963 | // relaxation loop. | |
1964 | this->tls_segment_ = NULL; | |
1965 | this->relro_segment_ = NULL; | |
1966 | Segment_list::iterator list_iter = this->segment_list_.begin(); | |
1967 | while (list_iter != this->segment_list_.end()) | |
1968 | { | |
1969 | Output_segment* segment = *list_iter; | |
1970 | Segment_states::const_iterator states_iter = | |
1971 | segment_states->find(segment); | |
1972 | if (states_iter != segment_states->end()) | |
1973 | { | |
1974 | const Output_segment* copy = states_iter->second; | |
1975 | // Shallow copy to restore states. | |
1976 | *segment = *copy; | |
1977 | ||
1978 | // Also fix up TLS and RELRO segment pointers as appropriate. | |
1979 | if (segment->type() == elfcpp::PT_TLS) | |
1980 | this->tls_segment_ = segment; | |
1981 | else if (segment->type() == elfcpp::PT_GNU_RELRO) | |
1982 | this->relro_segment_ = segment; | |
1983 | ||
1984 | ++list_iter; | |
1985 | } | |
1986 | else | |
1987 | { | |
1988 | list_iter = this->segment_list_.erase(list_iter); | |
1989 | // This is a segment created during section layout. It should be | |
1990 | // safe to remove it since we should have removed all pointers to it. | |
1991 | delete segment; | |
1992 | } | |
1993 | } | |
1994 | } | |
1995 | ||
1996 | // Clean up after relaxation so that sections can be laid out again. | |
1997 | ||
1998 | void | |
1999 | Layout::clean_up_after_relaxation() | |
2000 | { | |
2001 | // Restore the segments to point state just prior to the relaxation loop. | |
2002 | Script_sections* script_section = this->script_options_->script_sections(); | |
2003 | script_section->release_segments(); | |
2004 | this->restore_segments(this->segment_states_); | |
2005 | ||
2006 | // Reset section addresses and file offsets | |
2007 | for (Section_list::iterator p = this->section_list_.begin(); | |
2008 | p != this->section_list_.end(); | |
2009 | ++p) | |
2010 | { | |
20e6d0d6 | 2011 | (*p)->restore_states(); |
8923b24c DK |
2012 | |
2013 | // If an input section changes size because of relaxation, | |
2014 | // we need to adjust the section offsets of all input sections. | |
2015 | // after such a section. | |
2016 | if ((*p)->section_offsets_need_adjustment()) | |
2017 | (*p)->adjust_section_offsets(); | |
2018 | ||
2019 | (*p)->reset_address_and_file_offset(); | |
20e6d0d6 DK |
2020 | } |
2021 | ||
2022 | // Reset special output object address and file offsets. | |
2023 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
2024 | p != this->special_output_list_.end(); | |
2025 | ++p) | |
2026 | (*p)->reset_address_and_file_offset(); | |
2027 | ||
2028 | // A linker script may have created some output section data objects. | |
2029 | // They are useless now. | |
2030 | for (Output_section_data_list::const_iterator p = | |
2031 | this->script_output_section_data_list_.begin(); | |
2032 | p != this->script_output_section_data_list_.end(); | |
2033 | ++p) | |
2034 | delete *p; | |
2035 | this->script_output_section_data_list_.clear(); | |
2036 | } | |
2037 | ||
2038 | // Prepare for relaxation. | |
2039 | ||
2040 | void | |
2041 | Layout::prepare_for_relaxation() | |
2042 | { | |
2043 | // Create an relaxation debug check if in debugging mode. | |
2044 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2045 | this->relaxation_debug_check_ = new Relaxation_debug_check(); | |
2046 | ||
2047 | // Save segment states. | |
2048 | this->segment_states_ = new Segment_states(); | |
2049 | this->save_segments(this->segment_states_); | |
2050 | ||
2051 | for(Section_list::const_iterator p = this->section_list_.begin(); | |
2052 | p != this->section_list_.end(); | |
2053 | ++p) | |
2054 | (*p)->save_states(); | |
2055 | ||
2056 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2057 | this->relaxation_debug_check_->check_output_data_for_reset_values( | |
2058 | this->section_list_, this->special_output_list_); | |
2059 | ||
2060 | // Also enable recording of output section data from scripts. | |
2061 | this->record_output_section_data_from_script_ = true; | |
2062 | } | |
2063 | ||
2064 | // Relaxation loop body: If target has no relaxation, this runs only once | |
2065 | // Otherwise, the target relaxation hook is called at the end of | |
2066 | // each iteration. If the hook returns true, it means re-layout of | |
2067 | // section is required. | |
2068 | // | |
2069 | // The number of segments created by a linking script without a PHDRS | |
2070 | // clause may be affected by section sizes and alignments. There is | |
2071 | // a remote chance that relaxation causes different number of PT_LOAD | |
2072 | // segments are created and sections are attached to different segments. | |
2073 | // Therefore, we always throw away all segments created during section | |
2074 | // layout. In order to be able to restart the section layout, we keep | |
2075 | // a copy of the segment list right before the relaxation loop and use | |
2076 | // that to restore the segments. | |
2077 | // | |
2078 | // PASS is the current relaxation pass number. | |
2079 | // SYMTAB is a symbol table. | |
2080 | // PLOAD_SEG is the address of a pointer for the load segment. | |
2081 | // PHDR_SEG is a pointer to the PHDR segment. | |
2082 | // SEGMENT_HEADERS points to the output segment header. | |
2083 | // FILE_HEADER points to the output file header. | |
2084 | // PSHNDX is the address to store the output section index. | |
2085 | ||
2086 | off_t inline | |
2087 | Layout::relaxation_loop_body( | |
2088 | int pass, | |
2089 | Target* target, | |
2090 | Symbol_table* symtab, | |
2091 | Output_segment** pload_seg, | |
2092 | Output_segment* phdr_seg, | |
2093 | Output_segment_headers* segment_headers, | |
2094 | Output_file_header* file_header, | |
2095 | unsigned int* pshndx) | |
2096 | { | |
2097 | // If this is not the first iteration, we need to clean up after | |
2098 | // relaxation so that we can lay out the sections again. | |
2099 | if (pass != 0) | |
2100 | this->clean_up_after_relaxation(); | |
2101 | ||
2102 | // If there is a SECTIONS clause, put all the input sections into | |
2103 | // the required order. | |
2104 | Output_segment* load_seg; | |
2105 | if (this->script_options_->saw_sections_clause()) | |
2106 | load_seg = this->set_section_addresses_from_script(symtab); | |
2107 | else if (parameters->options().relocatable()) | |
2108 | load_seg = NULL; | |
2109 | else | |
2110 | load_seg = this->find_first_load_seg(); | |
2111 | ||
2112 | if (parameters->options().oformat_enum() | |
2113 | != General_options::OBJECT_FORMAT_ELF) | |
2114 | load_seg = NULL; | |
2115 | ||
403a15dd ILT |
2116 | // If the user set the address of the text segment, that may not be |
2117 | // compatible with putting the segment headers and file headers into | |
2118 | // that segment. | |
d12a5ea8 ILT |
2119 | if (parameters->options().user_set_Ttext() |
2120 | && parameters->options().Ttext() % target->common_pagesize() != 0) | |
2121 | { | |
2122 | load_seg = NULL; | |
2123 | phdr_seg = NULL; | |
2124 | } | |
403a15dd | 2125 | |
68b6574b ILT |
2126 | gold_assert(phdr_seg == NULL |
2127 | || load_seg != NULL | |
2128 | || this->script_options_->saw_sections_clause()); | |
20e6d0d6 | 2129 | |
a192ba05 | 2130 | // If the address of the load segment we found has been set by |
1e3811b0 ILT |
2131 | // --section-start rather than by a script, then adjust the VMA and |
2132 | // LMA downward if possible to include the file and section headers. | |
2133 | uint64_t header_gap = 0; | |
a192ba05 ILT |
2134 | if (load_seg != NULL |
2135 | && load_seg->are_addresses_set() | |
1e3811b0 ILT |
2136 | && !this->script_options_->saw_sections_clause() |
2137 | && !parameters->options().relocatable()) | |
2138 | { | |
2139 | file_header->finalize_data_size(); | |
2140 | segment_headers->finalize_data_size(); | |
2141 | size_t sizeof_headers = (file_header->data_size() | |
2142 | + segment_headers->data_size()); | |
2143 | const uint64_t abi_pagesize = target->abi_pagesize(); | |
2144 | uint64_t hdr_paddr = load_seg->paddr() - sizeof_headers; | |
2145 | hdr_paddr &= ~(abi_pagesize - 1); | |
2146 | uint64_t subtract = load_seg->paddr() - hdr_paddr; | |
2147 | if (load_seg->paddr() < subtract || load_seg->vaddr() < subtract) | |
2148 | load_seg = NULL; | |
2149 | else | |
2150 | { | |
2151 | load_seg->set_addresses(load_seg->vaddr() - subtract, | |
2152 | load_seg->paddr() - subtract); | |
2153 | header_gap = subtract - sizeof_headers; | |
2154 | } | |
2155 | } | |
a192ba05 | 2156 | |
20e6d0d6 DK |
2157 | // Lay out the segment headers. |
2158 | if (!parameters->options().relocatable()) | |
2159 | { | |
2160 | gold_assert(segment_headers != NULL); | |
1e3811b0 ILT |
2161 | if (header_gap != 0 && load_seg != NULL) |
2162 | { | |
2163 | Output_data_zero_fill* z = new Output_data_zero_fill(header_gap, 1); | |
2164 | load_seg->add_initial_output_data(z); | |
2165 | } | |
20e6d0d6 DK |
2166 | if (load_seg != NULL) |
2167 | load_seg->add_initial_output_data(segment_headers); | |
2168 | if (phdr_seg != NULL) | |
2169 | phdr_seg->add_initial_output_data(segment_headers); | |
2170 | } | |
2171 | ||
2172 | // Lay out the file header. | |
2173 | if (load_seg != NULL) | |
2174 | load_seg->add_initial_output_data(file_header); | |
2175 | ||
2176 | if (this->script_options_->saw_phdrs_clause() | |
2177 | && !parameters->options().relocatable()) | |
2178 | { | |
2179 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS | |
2180 | // clause in a linker script. | |
2181 | Script_sections* ss = this->script_options_->script_sections(); | |
2182 | ss->put_headers_in_phdrs(file_header, segment_headers); | |
2183 | } | |
2184 | ||
2185 | // We set the output section indexes in set_segment_offsets and | |
2186 | // set_section_indexes. | |
2187 | *pshndx = 1; | |
2188 | ||
2189 | // Set the file offsets of all the segments, and all the sections | |
2190 | // they contain. | |
2191 | off_t off; | |
2192 | if (!parameters->options().relocatable()) | |
2193 | off = this->set_segment_offsets(target, load_seg, pshndx); | |
2194 | else | |
2195 | off = this->set_relocatable_section_offsets(file_header, pshndx); | |
2196 | ||
2197 | // Verify that the dummy relaxation does not change anything. | |
2198 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
2199 | { | |
2200 | if (pass == 0) | |
2201 | this->relaxation_debug_check_->read_sections(this->section_list_); | |
2202 | else | |
2203 | this->relaxation_debug_check_->verify_sections(this->section_list_); | |
2204 | } | |
2205 | ||
2206 | *pload_seg = load_seg; | |
2207 | return off; | |
2208 | } | |
2209 | ||
6e9ba2ca ST |
2210 | // Search the list of patterns and find the postion of the given section |
2211 | // name in the output section. If the section name matches a glob | |
2212 | // pattern and a non-glob name, then the non-glob position takes | |
2213 | // precedence. Return 0 if no match is found. | |
2214 | ||
2215 | unsigned int | |
2216 | Layout::find_section_order_index(const std::string& section_name) | |
2217 | { | |
2218 | Unordered_map<std::string, unsigned int>::iterator map_it; | |
2219 | map_it = this->input_section_position_.find(section_name); | |
2220 | if (map_it != this->input_section_position_.end()) | |
2221 | return map_it->second; | |
2222 | ||
2223 | // Absolute match failed. Linear search the glob patterns. | |
2224 | std::vector<std::string>::iterator it; | |
2225 | for (it = this->input_section_glob_.begin(); | |
2226 | it != this->input_section_glob_.end(); | |
2227 | ++it) | |
2228 | { | |
2229 | if (fnmatch((*it).c_str(), section_name.c_str(), FNM_NOESCAPE) == 0) | |
2230 | { | |
2231 | map_it = this->input_section_position_.find(*it); | |
2232 | gold_assert(map_it != this->input_section_position_.end()); | |
2233 | return map_it->second; | |
2234 | } | |
2235 | } | |
2236 | return 0; | |
2237 | } | |
2238 | ||
2239 | // Read the sequence of input sections from the file specified with | |
e9552f7e | 2240 | // option --section-ordering-file. |
6e9ba2ca ST |
2241 | |
2242 | void | |
2243 | Layout::read_layout_from_file() | |
2244 | { | |
2245 | const char* filename = parameters->options().section_ordering_file(); | |
2246 | std::ifstream in; | |
2247 | std::string line; | |
2248 | ||
2249 | in.open(filename); | |
2250 | if (!in) | |
2251 | gold_fatal(_("unable to open --section-ordering-file file %s: %s"), | |
2252 | filename, strerror(errno)); | |
2253 | ||
2254 | std::getline(in, line); // this chops off the trailing \n, if any | |
2255 | unsigned int position = 1; | |
e9552f7e | 2256 | this->set_section_ordering_specified(); |
6e9ba2ca ST |
2257 | |
2258 | while (in) | |
2259 | { | |
2260 | if (!line.empty() && line[line.length() - 1] == '\r') // Windows | |
2261 | line.resize(line.length() - 1); | |
2262 | // Ignore comments, beginning with '#' | |
2263 | if (line[0] == '#') | |
2264 | { | |
2265 | std::getline(in, line); | |
2266 | continue; | |
2267 | } | |
2268 | this->input_section_position_[line] = position; | |
2269 | // Store all glob patterns in a vector. | |
2270 | if (is_wildcard_string(line.c_str())) | |
2271 | this->input_section_glob_.push_back(line); | |
2272 | position++; | |
2273 | std::getline(in, line); | |
2274 | } | |
2275 | } | |
2276 | ||
54dc6425 ILT |
2277 | // Finalize the layout. When this is called, we have created all the |
2278 | // output sections and all the output segments which are based on | |
2279 | // input sections. We have several things to do, and we have to do | |
2280 | // them in the right order, so that we get the right results correctly | |
2281 | // and efficiently. | |
2282 | ||
2283 | // 1) Finalize the list of output segments and create the segment | |
2284 | // table header. | |
2285 | ||
2286 | // 2) Finalize the dynamic symbol table and associated sections. | |
2287 | ||
2288 | // 3) Determine the final file offset of all the output segments. | |
2289 | ||
2290 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
2291 | // sections. | |
2292 | ||
75f65a3e ILT |
2293 | // 5) Create the symbol table sections and the section name table |
2294 | // section. | |
2295 | ||
2296 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
2297 | // value and make a final determination of which symbols are going |
2298 | // into the output symbol table. | |
2299 | ||
54dc6425 ILT |
2300 | // 7) Create the section table header. |
2301 | ||
2302 | // 8) Determine the final file offset of all the output sections which | |
2303 | // are not SHF_ALLOC, including the section table header. | |
2304 | ||
2305 | // 9) Finalize the ELF file header. | |
2306 | ||
75f65a3e ILT |
2307 | // This function returns the size of the output file. |
2308 | ||
2309 | off_t | |
17a1d0a9 | 2310 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
8851ecca | 2311 | Target* target, const Task* task) |
54dc6425 | 2312 | { |
f59f41f3 | 2313 | target->finalize_sections(this, input_objects, symtab); |
5a6f7e2d | 2314 | |
17a1d0a9 | 2315 | this->count_local_symbols(task, input_objects); |
7bf1f802 | 2316 | |
1518dc8f | 2317 | this->link_stabs_sections(); |
4f211c8b | 2318 | |
3802b2dd | 2319 | Output_segment* phdr_seg = NULL; |
8851ecca | 2320 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
54dc6425 | 2321 | { |
dbe717ef ILT |
2322 | // There was a dynamic object in the link. We need to create |
2323 | // some information for the dynamic linker. | |
2324 | ||
3802b2dd ILT |
2325 | // Create the PT_PHDR segment which will hold the program |
2326 | // headers. | |
1c4f3631 ILT |
2327 | if (!this->script_options_->saw_phdrs_clause()) |
2328 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
3802b2dd | 2329 | |
14b31740 ILT |
2330 | // Create the dynamic symbol table, including the hash table. |
2331 | Output_section* dynstr; | |
2332 | std::vector<Symbol*> dynamic_symbols; | |
2333 | unsigned int local_dynamic_count; | |
a5dc0706 ILT |
2334 | Versions versions(*this->script_options()->version_script_info(), |
2335 | &this->dynpool_); | |
9b07f471 | 2336 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
14b31740 ILT |
2337 | &local_dynamic_count, &dynamic_symbols, |
2338 | &versions); | |
dbe717ef ILT |
2339 | |
2340 | // Create the .interp section to hold the name of the | |
e1f74f98 ILT |
2341 | // interpreter, and put it in a PT_INTERP segment. Don't do it |
2342 | // if we saw a .interp section in an input file. | |
2343 | if ((!parameters->options().shared() | |
2344 | || parameters->options().dynamic_linker() != NULL) | |
2345 | && this->interp_segment_ == NULL) | |
96f2030e | 2346 | this->create_interp(target); |
a3ad94ed ILT |
2347 | |
2348 | // Finish the .dynamic section to hold the dynamic data, and put | |
2349 | // it in a PT_DYNAMIC segment. | |
16649710 | 2350 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
2351 | |
2352 | // We should have added everything we need to the dynamic string | |
2353 | // table. | |
2354 | this->dynpool_.set_string_offsets(); | |
2355 | ||
2356 | // Create the version sections. We can't do this until the | |
2357 | // dynamic string table is complete. | |
46fe1623 | 2358 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
14b31740 | 2359 | dynamic_symbols, dynstr); |
f0ba79e2 ILT |
2360 | |
2361 | // Set the size of the _DYNAMIC symbol. We can't do this until | |
2362 | // after we call create_version_sections. | |
2363 | this->set_dynamic_symbol_size(symtab); | |
54dc6425 | 2364 | } |
3ce2c28e | 2365 | |
20e6d0d6 DK |
2366 | // Create segment headers. |
2367 | Output_segment_headers* segment_headers = | |
2368 | (parameters->options().relocatable() | |
2369 | ? NULL | |
2370 | : new Output_segment_headers(this->segment_list_)); | |
75f65a3e ILT |
2371 | |
2372 | // Lay out the file header. | |
a10ae760 ILT |
2373 | Output_file_header* file_header = new Output_file_header(target, symtab, |
2374 | segment_headers); | |
a445fddf | 2375 | |
61ba1cf9 | 2376 | this->special_output_list_.push_back(file_header); |
6a74a719 ILT |
2377 | if (segment_headers != NULL) |
2378 | this->special_output_list_.push_back(segment_headers); | |
75f65a3e | 2379 | |
20e6d0d6 DK |
2380 | // Find approriate places for orphan output sections if we are using |
2381 | // a linker script. | |
2382 | if (this->script_options_->saw_sections_clause()) | |
2383 | this->place_orphan_sections_in_script(); | |
2384 | ||
2385 | Output_segment* load_seg; | |
2386 | off_t off; | |
2387 | unsigned int shndx; | |
2388 | int pass = 0; | |
2389 | ||
2390 | // Take a snapshot of the section layout as needed. | |
2391 | if (target->may_relax()) | |
2392 | this->prepare_for_relaxation(); | |
2393 | ||
2394 | // Run the relaxation loop to lay out sections. | |
2395 | do | |
1c4f3631 | 2396 | { |
20e6d0d6 DK |
2397 | off = this->relaxation_loop_body(pass, target, symtab, &load_seg, |
2398 | phdr_seg, segment_headers, file_header, | |
2399 | &shndx); | |
2400 | pass++; | |
1c4f3631 | 2401 | } |
c0a62865 | 2402 | while (target->may_relax() |
f625ae50 | 2403 | && target->relax(pass, input_objects, symtab, this, task)); |
75f65a3e | 2404 | |
a9a60db6 ILT |
2405 | // Set the file offsets of all the non-data sections we've seen so |
2406 | // far which don't have to wait for the input sections. We need | |
2407 | // this in order to finalize local symbols in non-allocated | |
2408 | // sections. | |
2409 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); | |
2410 | ||
d491d34e ILT |
2411 | // Set the section indexes of all unallocated sections seen so far, |
2412 | // in case any of them are somehow referenced by a symbol. | |
2413 | shndx = this->set_section_indexes(shndx); | |
2414 | ||
75f65a3e | 2415 | // Create the symbol table sections. |
d491d34e | 2416 | this->create_symtab_sections(input_objects, symtab, shndx, &off); |
7bf1f802 ILT |
2417 | if (!parameters->doing_static_link()) |
2418 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e | 2419 | |
e5756efb ILT |
2420 | // Process any symbol assignments from a linker script. This must |
2421 | // be called after the symbol table has been finalized. | |
2422 | this->script_options_->finalize_symbols(symtab, this); | |
2423 | ||
09ec0418 CC |
2424 | // Create the incremental inputs sections. |
2425 | if (this->incremental_inputs_) | |
2426 | { | |
2427 | this->incremental_inputs_->finalize(); | |
2428 | this->create_incremental_info_sections(symtab); | |
2429 | } | |
2430 | ||
75f65a3e ILT |
2431 | // Create the .shstrtab section. |
2432 | Output_section* shstrtab_section = this->create_shstrtab(); | |
2433 | ||
a9a60db6 ILT |
2434 | // Set the file offsets of the rest of the non-data sections which |
2435 | // don't have to wait for the input sections. | |
9a0910c3 | 2436 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 | 2437 | |
d491d34e ILT |
2438 | // Now that all sections have been created, set the section indexes |
2439 | // for any sections which haven't been done yet. | |
86887060 | 2440 | shndx = this->set_section_indexes(shndx); |
ead1e424 | 2441 | |
75f65a3e | 2442 | // Create the section table header. |
d491d34e | 2443 | this->create_shdrs(shstrtab_section, &off); |
75f65a3e | 2444 | |
17a1d0a9 ILT |
2445 | // If there are no sections which require postprocessing, we can |
2446 | // handle the section names now, and avoid a resize later. | |
2447 | if (!this->any_postprocessing_sections_) | |
09ec0418 CC |
2448 | { |
2449 | off = this->set_section_offsets(off, | |
2450 | POSTPROCESSING_SECTIONS_PASS); | |
2451 | off = | |
2452 | this->set_section_offsets(off, | |
17a1d0a9 | 2453 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); |
09ec0418 | 2454 | } |
17a1d0a9 | 2455 | |
27bc2bce | 2456 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 2457 | |
27bc2bce ILT |
2458 | // Now we know exactly where everything goes in the output file |
2459 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 2460 | Output_data::layout_complete(); |
75f65a3e | 2461 | |
e44fcf3b ILT |
2462 | this->output_file_size_ = off; |
2463 | ||
75f65a3e ILT |
2464 | return off; |
2465 | } | |
2466 | ||
8ed814a9 | 2467 | // Create a note header following the format defined in the ELF ABI. |
ec3f783e ILT |
2468 | // NAME is the name, NOTE_TYPE is the type, SECTION_NAME is the name |
2469 | // of the section to create, DESCSZ is the size of the descriptor. | |
2470 | // ALLOCATE is true if the section should be allocated in memory. | |
2471 | // This returns the new note section. It sets *TRAILING_PADDING to | |
2472 | // the number of trailing zero bytes required. | |
4f211c8b | 2473 | |
8ed814a9 | 2474 | Output_section* |
ef4ab7a8 PP |
2475 | Layout::create_note(const char* name, int note_type, |
2476 | const char* section_name, size_t descsz, | |
8ed814a9 | 2477 | bool allocate, size_t* trailing_padding) |
4f211c8b | 2478 | { |
e2305dc0 ILT |
2479 | // Authorities all agree that the values in a .note field should |
2480 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
2481 | // they differ on what the alignment is for 64-bit binaries. | |
2482 | // The GABI says unambiguously they take 8-byte alignment: | |
2483 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
2484 | // Other documentation says alignment should always be 4 bytes: | |
2485 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
2486 | // GNU ld and GNU readelf both support the latter (at least as of | |
2487 | // version 2.16.91), and glibc always generates the latter for | |
2488 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
2489 | // here. | |
35cdfc9a | 2490 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
8851ecca | 2491 | const int size = parameters->target().get_size(); |
e2305dc0 ILT |
2492 | #else |
2493 | const int size = 32; | |
2494 | #endif | |
4f211c8b ILT |
2495 | |
2496 | // The contents of the .note section. | |
4f211c8b ILT |
2497 | size_t namesz = strlen(name) + 1; |
2498 | size_t aligned_namesz = align_address(namesz, size / 8); | |
4f211c8b | 2499 | size_t aligned_descsz = align_address(descsz, size / 8); |
4f211c8b | 2500 | |
8ed814a9 | 2501 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
4f211c8b | 2502 | |
8ed814a9 ILT |
2503 | unsigned char* buffer = new unsigned char[notehdrsz]; |
2504 | memset(buffer, 0, notehdrsz); | |
4f211c8b | 2505 | |
8851ecca | 2506 | bool is_big_endian = parameters->target().is_big_endian(); |
4f211c8b ILT |
2507 | |
2508 | if (size == 32) | |
2509 | { | |
2510 | if (!is_big_endian) | |
2511 | { | |
2512 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
2513 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
2514 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
2515 | } | |
2516 | else | |
2517 | { | |
2518 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
2519 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
2520 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
2521 | } | |
2522 | } | |
2523 | else if (size == 64) | |
2524 | { | |
2525 | if (!is_big_endian) | |
2526 | { | |
2527 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
2528 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
2529 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
2530 | } | |
2531 | else | |
2532 | { | |
2533 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
2534 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
2535 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
2536 | } | |
2537 | } | |
2538 | else | |
2539 | gold_unreachable(); | |
2540 | ||
2541 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
4f211c8b | 2542 | |
8ed814a9 | 2543 | elfcpp::Elf_Xword flags = 0; |
22f0da72 | 2544 | Output_section_order order = ORDER_INVALID; |
8ed814a9 | 2545 | if (allocate) |
22f0da72 ILT |
2546 | { |
2547 | flags = elfcpp::SHF_ALLOC; | |
2548 | order = ORDER_RO_NOTE; | |
2549 | } | |
ec3f783e ILT |
2550 | Output_section* os = this->choose_output_section(NULL, section_name, |
2551 | elfcpp::SHT_NOTE, | |
22f0da72 | 2552 | flags, false, order, false); |
9c547ec3 ILT |
2553 | if (os == NULL) |
2554 | return NULL; | |
2555 | ||
8ed814a9 | 2556 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, |
7d9e3d98 ILT |
2557 | size / 8, |
2558 | "** note header"); | |
8ed814a9 ILT |
2559 | os->add_output_section_data(posd); |
2560 | ||
2561 | *trailing_padding = aligned_descsz - descsz; | |
2562 | ||
2563 | return os; | |
2564 | } | |
2565 | ||
2566 | // For an executable or shared library, create a note to record the | |
2567 | // version of gold used to create the binary. | |
2568 | ||
2569 | void | |
2570 | Layout::create_gold_note() | |
2571 | { | |
cdc29364 CC |
2572 | if (parameters->options().relocatable() |
2573 | || parameters->incremental_update()) | |
8ed814a9 ILT |
2574 | return; |
2575 | ||
2576 | std::string desc = std::string("gold ") + gold::get_version_string(); | |
2577 | ||
2578 | size_t trailing_padding; | |
ca09d69a | 2579 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, |
ef4ab7a8 PP |
2580 | ".note.gnu.gold-version", desc.size(), |
2581 | false, &trailing_padding); | |
9c547ec3 ILT |
2582 | if (os == NULL) |
2583 | return; | |
8ed814a9 ILT |
2584 | |
2585 | Output_section_data* posd = new Output_data_const(desc, 4); | |
4f211c8b | 2586 | os->add_output_section_data(posd); |
8ed814a9 ILT |
2587 | |
2588 | if (trailing_padding > 0) | |
2589 | { | |
7d9e3d98 | 2590 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
2591 | os->add_output_section_data(posd); |
2592 | } | |
4f211c8b ILT |
2593 | } |
2594 | ||
35cdfc9a ILT |
2595 | // Record whether the stack should be executable. This can be set |
2596 | // from the command line using the -z execstack or -z noexecstack | |
2597 | // options. Otherwise, if any input file has a .note.GNU-stack | |
2598 | // section with the SHF_EXECINSTR flag set, the stack should be | |
2599 | // executable. Otherwise, if at least one input file a | |
2600 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
2601 | // section, we use the target default for whether the stack should be | |
2602 | // executable. Otherwise, we don't generate a stack note. When | |
2603 | // generating a object file, we create a .note.GNU-stack section with | |
2604 | // the appropriate marking. When generating an executable or shared | |
2605 | // library, we create a PT_GNU_STACK segment. | |
2606 | ||
2607 | void | |
9c547ec3 | 2608 | Layout::create_executable_stack_info() |
35cdfc9a ILT |
2609 | { |
2610 | bool is_stack_executable; | |
e55bde5e ILT |
2611 | if (parameters->options().is_execstack_set()) |
2612 | is_stack_executable = parameters->options().is_stack_executable(); | |
35cdfc9a ILT |
2613 | else if (!this->input_with_gnu_stack_note_) |
2614 | return; | |
2615 | else | |
2616 | { | |
2617 | if (this->input_requires_executable_stack_) | |
2618 | is_stack_executable = true; | |
2619 | else if (this->input_without_gnu_stack_note_) | |
9c547ec3 ILT |
2620 | is_stack_executable = |
2621 | parameters->target().is_default_stack_executable(); | |
35cdfc9a ILT |
2622 | else |
2623 | is_stack_executable = false; | |
2624 | } | |
2625 | ||
8851ecca | 2626 | if (parameters->options().relocatable()) |
35cdfc9a ILT |
2627 | { |
2628 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
2629 | elfcpp::Elf_Xword flags = 0; | |
2630 | if (is_stack_executable) | |
2631 | flags |= elfcpp::SHF_EXECINSTR; | |
22f0da72 ILT |
2632 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags, |
2633 | ORDER_INVALID, false); | |
35cdfc9a ILT |
2634 | } |
2635 | else | |
2636 | { | |
1c4f3631 ILT |
2637 | if (this->script_options_->saw_phdrs_clause()) |
2638 | return; | |
35cdfc9a ILT |
2639 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
2640 | if (is_stack_executable) | |
2641 | flags |= elfcpp::PF_X; | |
3802b2dd | 2642 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); |
35cdfc9a ILT |
2643 | } |
2644 | } | |
2645 | ||
8ed814a9 ILT |
2646 | // If --build-id was used, set up the build ID note. |
2647 | ||
2648 | void | |
2649 | Layout::create_build_id() | |
2650 | { | |
2651 | if (!parameters->options().user_set_build_id()) | |
2652 | return; | |
2653 | ||
2654 | const char* style = parameters->options().build_id(); | |
2655 | if (strcmp(style, "none") == 0) | |
2656 | return; | |
2657 | ||
2658 | // Set DESCSZ to the size of the note descriptor. When possible, | |
2659 | // set DESC to the note descriptor contents. | |
2660 | size_t descsz; | |
2661 | std::string desc; | |
2662 | if (strcmp(style, "md5") == 0) | |
2663 | descsz = 128 / 8; | |
2664 | else if (strcmp(style, "sha1") == 0) | |
2665 | descsz = 160 / 8; | |
2666 | else if (strcmp(style, "uuid") == 0) | |
2667 | { | |
2668 | const size_t uuidsz = 128 / 8; | |
2669 | ||
2670 | char buffer[uuidsz]; | |
2671 | memset(buffer, 0, uuidsz); | |
2672 | ||
2a00e4fb | 2673 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
8ed814a9 ILT |
2674 | if (descriptor < 0) |
2675 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), | |
2676 | strerror(errno)); | |
2677 | else | |
2678 | { | |
2679 | ssize_t got = ::read(descriptor, buffer, uuidsz); | |
2a00e4fb | 2680 | release_descriptor(descriptor, true); |
8ed814a9 ILT |
2681 | if (got < 0) |
2682 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); | |
2683 | else if (static_cast<size_t>(got) != uuidsz) | |
2684 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), | |
2685 | uuidsz, got); | |
2686 | } | |
2687 | ||
2688 | desc.assign(buffer, uuidsz); | |
2689 | descsz = uuidsz; | |
2690 | } | |
2691 | else if (strncmp(style, "0x", 2) == 0) | |
2692 | { | |
2693 | hex_init(); | |
2694 | const char* p = style + 2; | |
2695 | while (*p != '\0') | |
2696 | { | |
2697 | if (hex_p(p[0]) && hex_p(p[1])) | |
2698 | { | |
2699 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); | |
2700 | desc += c; | |
2701 | p += 2; | |
2702 | } | |
2703 | else if (*p == '-' || *p == ':') | |
2704 | ++p; | |
2705 | else | |
2706 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), | |
2707 | style); | |
2708 | } | |
2709 | descsz = desc.size(); | |
2710 | } | |
2711 | else | |
2712 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); | |
2713 | ||
2714 | // Create the note. | |
2715 | size_t trailing_padding; | |
2716 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, | |
ef4ab7a8 PP |
2717 | ".note.gnu.build-id", descsz, true, |
2718 | &trailing_padding); | |
9c547ec3 ILT |
2719 | if (os == NULL) |
2720 | return; | |
8ed814a9 ILT |
2721 | |
2722 | if (!desc.empty()) | |
2723 | { | |
2724 | // We know the value already, so we fill it in now. | |
2725 | gold_assert(desc.size() == descsz); | |
2726 | ||
2727 | Output_section_data* posd = new Output_data_const(desc, 4); | |
2728 | os->add_output_section_data(posd); | |
2729 | ||
2730 | if (trailing_padding != 0) | |
2731 | { | |
7d9e3d98 | 2732 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
2733 | os->add_output_section_data(posd); |
2734 | } | |
2735 | } | |
2736 | else | |
2737 | { | |
2738 | // We need to compute a checksum after we have completed the | |
2739 | // link. | |
2740 | gold_assert(trailing_padding == 0); | |
7d9e3d98 | 2741 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
8ed814a9 | 2742 | os->add_output_section_data(this->build_id_note_); |
8ed814a9 ILT |
2743 | } |
2744 | } | |
2745 | ||
1518dc8f ILT |
2746 | // If we have both .stabXX and .stabXXstr sections, then the sh_link |
2747 | // field of the former should point to the latter. I'm not sure who | |
2748 | // started this, but the GNU linker does it, and some tools depend | |
2749 | // upon it. | |
2750 | ||
2751 | void | |
2752 | Layout::link_stabs_sections() | |
2753 | { | |
2754 | if (!this->have_stabstr_section_) | |
2755 | return; | |
2756 | ||
2757 | for (Section_list::iterator p = this->section_list_.begin(); | |
2758 | p != this->section_list_.end(); | |
2759 | ++p) | |
2760 | { | |
2761 | if ((*p)->type() != elfcpp::SHT_STRTAB) | |
2762 | continue; | |
2763 | ||
2764 | const char* name = (*p)->name(); | |
2765 | if (strncmp(name, ".stab", 5) != 0) | |
2766 | continue; | |
2767 | ||
2768 | size_t len = strlen(name); | |
2769 | if (strcmp(name + len - 3, "str") != 0) | |
2770 | continue; | |
2771 | ||
2772 | std::string stab_name(name, len - 3); | |
2773 | Output_section* stab_sec; | |
2774 | stab_sec = this->find_output_section(stab_name.c_str()); | |
2775 | if (stab_sec != NULL) | |
2776 | stab_sec->set_link_section(*p); | |
2777 | } | |
2778 | } | |
2779 | ||
09ec0418 | 2780 | // Create .gnu_incremental_inputs and related sections needed |
3ce2c28e ILT |
2781 | // for the next run of incremental linking to check what has changed. |
2782 | ||
2783 | void | |
09ec0418 | 2784 | Layout::create_incremental_info_sections(Symbol_table* symtab) |
3ce2c28e | 2785 | { |
09ec0418 CC |
2786 | Incremental_inputs* incr = this->incremental_inputs_; |
2787 | ||
2788 | gold_assert(incr != NULL); | |
2789 | ||
2790 | // Create the .gnu_incremental_inputs, _symtab, and _relocs input sections. | |
2791 | incr->create_data_sections(symtab); | |
3ce2c28e ILT |
2792 | |
2793 | // Add the .gnu_incremental_inputs section. | |
ca09d69a | 2794 | const char* incremental_inputs_name = |
3ce2c28e | 2795 | this->namepool_.add(".gnu_incremental_inputs", false, NULL); |
09ec0418 | 2796 | Output_section* incremental_inputs_os = |
3ce2c28e | 2797 | this->make_output_section(incremental_inputs_name, |
f5c870d2 | 2798 | elfcpp::SHT_GNU_INCREMENTAL_INPUTS, 0, |
22f0da72 | 2799 | ORDER_INVALID, false); |
09ec0418 CC |
2800 | incremental_inputs_os->add_output_section_data(incr->inputs_section()); |
2801 | ||
2802 | // Add the .gnu_incremental_symtab section. | |
ca09d69a | 2803 | const char* incremental_symtab_name = |
09ec0418 CC |
2804 | this->namepool_.add(".gnu_incremental_symtab", false, NULL); |
2805 | Output_section* incremental_symtab_os = | |
2806 | this->make_output_section(incremental_symtab_name, | |
2807 | elfcpp::SHT_GNU_INCREMENTAL_SYMTAB, 0, | |
2808 | ORDER_INVALID, false); | |
2809 | incremental_symtab_os->add_output_section_data(incr->symtab_section()); | |
2810 | incremental_symtab_os->set_entsize(4); | |
2811 | ||
2812 | // Add the .gnu_incremental_relocs section. | |
ca09d69a | 2813 | const char* incremental_relocs_name = |
09ec0418 CC |
2814 | this->namepool_.add(".gnu_incremental_relocs", false, NULL); |
2815 | Output_section* incremental_relocs_os = | |
2816 | this->make_output_section(incremental_relocs_name, | |
2817 | elfcpp::SHT_GNU_INCREMENTAL_RELOCS, 0, | |
2818 | ORDER_INVALID, false); | |
2819 | incremental_relocs_os->add_output_section_data(incr->relocs_section()); | |
2820 | incremental_relocs_os->set_entsize(incr->relocs_entsize()); | |
2821 | ||
0e70b911 | 2822 | // Add the .gnu_incremental_got_plt section. |
ca09d69a | 2823 | const char* incremental_got_plt_name = |
0e70b911 CC |
2824 | this->namepool_.add(".gnu_incremental_got_plt", false, NULL); |
2825 | Output_section* incremental_got_plt_os = | |
2826 | this->make_output_section(incremental_got_plt_name, | |
2827 | elfcpp::SHT_GNU_INCREMENTAL_GOT_PLT, 0, | |
2828 | ORDER_INVALID, false); | |
2829 | incremental_got_plt_os->add_output_section_data(incr->got_plt_section()); | |
2830 | ||
3ce2c28e | 2831 | // Add the .gnu_incremental_strtab section. |
ca09d69a | 2832 | const char* incremental_strtab_name = |
3ce2c28e | 2833 | this->namepool_.add(".gnu_incremental_strtab", false, NULL); |
09ec0418 CC |
2834 | Output_section* incremental_strtab_os = this->make_output_section(incremental_strtab_name, |
2835 | elfcpp::SHT_STRTAB, 0, | |
2836 | ORDER_INVALID, false); | |
3ce2c28e | 2837 | Output_data_strtab* strtab_data = |
09ec0418 CC |
2838 | new Output_data_strtab(incr->get_stringpool()); |
2839 | incremental_strtab_os->add_output_section_data(strtab_data); | |
2840 | ||
2841 | incremental_inputs_os->set_after_input_sections(); | |
2842 | incremental_symtab_os->set_after_input_sections(); | |
2843 | incremental_relocs_os->set_after_input_sections(); | |
0e70b911 | 2844 | incremental_got_plt_os->set_after_input_sections(); |
09ec0418 CC |
2845 | |
2846 | incremental_inputs_os->set_link_section(incremental_strtab_os); | |
2847 | incremental_symtab_os->set_link_section(incremental_inputs_os); | |
2848 | incremental_relocs_os->set_link_section(incremental_inputs_os); | |
0e70b911 | 2849 | incremental_got_plt_os->set_link_section(incremental_inputs_os); |
3ce2c28e ILT |
2850 | } |
2851 | ||
75f65a3e ILT |
2852 | // Return whether SEG1 should be before SEG2 in the output file. This |
2853 | // is based entirely on the segment type and flags. When this is | |
aecf301f | 2854 | // called the segment addresses have normally not yet been set. |
75f65a3e ILT |
2855 | |
2856 | bool | |
2857 | Layout::segment_precedes(const Output_segment* seg1, | |
2858 | const Output_segment* seg2) | |
2859 | { | |
2860 | elfcpp::Elf_Word type1 = seg1->type(); | |
2861 | elfcpp::Elf_Word type2 = seg2->type(); | |
2862 | ||
2863 | // The single PT_PHDR segment is required to precede any loadable | |
2864 | // segment. We simply make it always first. | |
2865 | if (type1 == elfcpp::PT_PHDR) | |
2866 | { | |
a3ad94ed | 2867 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
2868 | return true; |
2869 | } | |
2870 | if (type2 == elfcpp::PT_PHDR) | |
2871 | return false; | |
2872 | ||
2873 | // The single PT_INTERP segment is required to precede any loadable | |
2874 | // segment. We simply make it always second. | |
2875 | if (type1 == elfcpp::PT_INTERP) | |
2876 | { | |
a3ad94ed | 2877 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
2878 | return true; |
2879 | } | |
2880 | if (type2 == elfcpp::PT_INTERP) | |
2881 | return false; | |
2882 | ||
2883 | // We then put PT_LOAD segments before any other segments. | |
2884 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
2885 | return true; | |
2886 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
2887 | return false; | |
2888 | ||
9f1d377b ILT |
2889 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
2890 | // segment, because that is where the dynamic linker expects to find | |
2891 | // it (this is just for efficiency; other positions would also work | |
2892 | // correctly). | |
2893 | if (type1 == elfcpp::PT_TLS | |
2894 | && type2 != elfcpp::PT_TLS | |
2895 | && type2 != elfcpp::PT_GNU_RELRO) | |
2896 | return false; | |
2897 | if (type2 == elfcpp::PT_TLS | |
2898 | && type1 != elfcpp::PT_TLS | |
2899 | && type1 != elfcpp::PT_GNU_RELRO) | |
2900 | return true; | |
2901 | ||
2902 | // We put the PT_GNU_RELRO segment last, because that is where the | |
2903 | // dynamic linker expects to find it (as with PT_TLS, this is just | |
2904 | // for efficiency). | |
2905 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) | |
92e059d8 | 2906 | return false; |
9f1d377b | 2907 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
92e059d8 ILT |
2908 | return true; |
2909 | ||
75f65a3e ILT |
2910 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
2911 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
2912 | ||
2913 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
2914 | // by the numeric segment type and flags values. There should not | |
2915 | // be more than one segment with the same type and flags. | |
2916 | if (type1 != elfcpp::PT_LOAD) | |
2917 | { | |
2918 | if (type1 != type2) | |
2919 | return type1 < type2; | |
a3ad94ed | 2920 | gold_assert(flags1 != flags2); |
75f65a3e ILT |
2921 | return flags1 < flags2; |
2922 | } | |
2923 | ||
a445fddf ILT |
2924 | // If the addresses are set already, sort by load address. |
2925 | if (seg1->are_addresses_set()) | |
2926 | { | |
2927 | if (!seg2->are_addresses_set()) | |
2928 | return true; | |
2929 | ||
2930 | unsigned int section_count1 = seg1->output_section_count(); | |
2931 | unsigned int section_count2 = seg2->output_section_count(); | |
2932 | if (section_count1 == 0 && section_count2 > 0) | |
2933 | return true; | |
2934 | if (section_count1 > 0 && section_count2 == 0) | |
2935 | return false; | |
2936 | ||
b8fa8750 NC |
2937 | uint64_t paddr1 = (seg1->are_addresses_set() |
2938 | ? seg1->paddr() | |
2939 | : seg1->first_section_load_address()); | |
2940 | uint64_t paddr2 = (seg2->are_addresses_set() | |
2941 | ? seg2->paddr() | |
2942 | : seg2->first_section_load_address()); | |
2943 | ||
a445fddf ILT |
2944 | if (paddr1 != paddr2) |
2945 | return paddr1 < paddr2; | |
2946 | } | |
2947 | else if (seg2->are_addresses_set()) | |
2948 | return false; | |
2949 | ||
8a5e3e08 ILT |
2950 | // A segment which holds large data comes after a segment which does |
2951 | // not hold large data. | |
2952 | if (seg1->is_large_data_segment()) | |
2953 | { | |
2954 | if (!seg2->is_large_data_segment()) | |
2955 | return false; | |
2956 | } | |
2957 | else if (seg2->is_large_data_segment()) | |
2958 | return true; | |
2959 | ||
2960 | // Otherwise, we sort PT_LOAD segments based on the flags. Readonly | |
2961 | // segments come before writable segments. Then writable segments | |
2962 | // with data come before writable segments without data. Then | |
2963 | // executable segments come before non-executable segments. Then | |
2964 | // the unlikely case of a non-readable segment comes before the | |
2965 | // normal case of a readable segment. If there are multiple | |
2966 | // segments with the same type and flags, we require that the | |
2967 | // address be set, and we sort by virtual address and then physical | |
2968 | // address. | |
75f65a3e ILT |
2969 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
2970 | return (flags1 & elfcpp::PF_W) == 0; | |
756ac4a8 ILT |
2971 | if ((flags1 & elfcpp::PF_W) != 0 |
2972 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) | |
2973 | return seg1->has_any_data_sections(); | |
75f65a3e ILT |
2974 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
2975 | return (flags1 & elfcpp::PF_X) != 0; | |
2976 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
2977 | return (flags1 & elfcpp::PF_R) == 0; | |
2978 | ||
a445fddf | 2979 | // We shouldn't get here--we shouldn't create segments which we |
aecf301f | 2980 | // can't distinguish. Unless of course we are using a weird linker |
ea0d8c47 ILT |
2981 | // script or overlapping --section-start options. |
2982 | gold_assert(this->script_options_->saw_phdrs_clause() | |
2983 | || parameters->options().any_section_start()); | |
aecf301f | 2984 | return false; |
75f65a3e ILT |
2985 | } |
2986 | ||
8a5e3e08 ILT |
2987 | // Increase OFF so that it is congruent to ADDR modulo ABI_PAGESIZE. |
2988 | ||
2989 | static off_t | |
2990 | align_file_offset(off_t off, uint64_t addr, uint64_t abi_pagesize) | |
2991 | { | |
2992 | uint64_t unsigned_off = off; | |
2993 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) | |
2994 | | (addr & (abi_pagesize - 1))); | |
2995 | if (aligned_off < unsigned_off) | |
2996 | aligned_off += abi_pagesize; | |
2997 | return aligned_off; | |
2998 | } | |
2999 | ||
ead1e424 ILT |
3000 | // Set the file offsets of all the segments, and all the sections they |
3001 | // contain. They have all been created. LOAD_SEG must be be laid out | |
3002 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
3003 | |
3004 | off_t | |
ead1e424 | 3005 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
ca09d69a | 3006 | unsigned int* pshndx) |
75f65a3e | 3007 | { |
aecf301f ILT |
3008 | // Sort them into the final order. We use a stable sort so that we |
3009 | // don't randomize the order of indistinguishable segments created | |
3010 | // by linker scripts. | |
3011 | std::stable_sort(this->segment_list_.begin(), this->segment_list_.end(), | |
3012 | Layout::Compare_segments(this)); | |
54dc6425 | 3013 | |
75f65a3e ILT |
3014 | // Find the PT_LOAD segments, and set their addresses and offsets |
3015 | // and their section's addresses and offsets. | |
0c5e9c22 | 3016 | uint64_t addr; |
e55bde5e ILT |
3017 | if (parameters->options().user_set_Ttext()) |
3018 | addr = parameters->options().Ttext(); | |
374ad285 | 3019 | else if (parameters->options().output_is_position_independent()) |
a445fddf | 3020 | addr = 0; |
0c5e9c22 ILT |
3021 | else |
3022 | addr = target->default_text_segment_address(); | |
75f65a3e | 3023 | off_t off = 0; |
a445fddf ILT |
3024 | |
3025 | // If LOAD_SEG is NULL, then the file header and segment headers | |
3026 | // will not be loadable. But they still need to be at offset 0 in | |
3027 | // the file. Set their offsets now. | |
3028 | if (load_seg == NULL) | |
3029 | { | |
3030 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
3031 | p != this->special_output_list_.end(); | |
3032 | ++p) | |
3033 | { | |
3034 | off = align_address(off, (*p)->addralign()); | |
3035 | (*p)->set_address_and_file_offset(0, off); | |
3036 | off += (*p)->data_size(); | |
3037 | } | |
3038 | } | |
3039 | ||
1a2dff53 ILT |
3040 | unsigned int increase_relro = this->increase_relro_; |
3041 | if (this->script_options_->saw_sections_clause()) | |
3042 | increase_relro = 0; | |
3043 | ||
34810851 ILT |
3044 | const bool check_sections = parameters->options().check_sections(); |
3045 | Output_segment* last_load_segment = NULL; | |
3046 | ||
75f65a3e ILT |
3047 | for (Segment_list::iterator p = this->segment_list_.begin(); |
3048 | p != this->segment_list_.end(); | |
3049 | ++p) | |
3050 | { | |
3051 | if ((*p)->type() == elfcpp::PT_LOAD) | |
3052 | { | |
3053 | if (load_seg != NULL && load_seg != *p) | |
a3ad94ed | 3054 | gold_unreachable(); |
75f65a3e ILT |
3055 | load_seg = NULL; |
3056 | ||
756ac4a8 ILT |
3057 | bool are_addresses_set = (*p)->are_addresses_set(); |
3058 | if (are_addresses_set) | |
3059 | { | |
3060 | // When it comes to setting file offsets, we care about | |
3061 | // the physical address. | |
3062 | addr = (*p)->paddr(); | |
3063 | } | |
9590bf25 CC |
3064 | else if (parameters->options().user_set_Ttext() |
3065 | && ((*p)->flags() & elfcpp::PF_W) == 0) | |
3066 | { | |
3067 | are_addresses_set = true; | |
3068 | } | |
e55bde5e | 3069 | else if (parameters->options().user_set_Tdata() |
756ac4a8 | 3070 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
e55bde5e | 3071 | && (!parameters->options().user_set_Tbss() |
756ac4a8 ILT |
3072 | || (*p)->has_any_data_sections())) |
3073 | { | |
e55bde5e | 3074 | addr = parameters->options().Tdata(); |
756ac4a8 ILT |
3075 | are_addresses_set = true; |
3076 | } | |
e55bde5e | 3077 | else if (parameters->options().user_set_Tbss() |
756ac4a8 ILT |
3078 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
3079 | && !(*p)->has_any_data_sections()) | |
3080 | { | |
e55bde5e | 3081 | addr = parameters->options().Tbss(); |
756ac4a8 ILT |
3082 | are_addresses_set = true; |
3083 | } | |
3084 | ||
75f65a3e ILT |
3085 | uint64_t orig_addr = addr; |
3086 | uint64_t orig_off = off; | |
3087 | ||
a445fddf | 3088 | uint64_t aligned_addr = 0; |
75f65a3e | 3089 | uint64_t abi_pagesize = target->abi_pagesize(); |
af6156ef | 3090 | uint64_t common_pagesize = target->common_pagesize(); |
0496d5e5 | 3091 | |
af6156ef ILT |
3092 | if (!parameters->options().nmagic() |
3093 | && !parameters->options().omagic()) | |
3094 | (*p)->set_minimum_p_align(common_pagesize); | |
0496d5e5 | 3095 | |
8a5e3e08 | 3096 | if (!are_addresses_set) |
a445fddf | 3097 | { |
a6577478 RÁE |
3098 | // Skip the address forward one page, maintaining the same |
3099 | // position within the page. This lets us store both segments | |
3100 | // overlapping on a single page in the file, but the loader will | |
3101 | // put them on different pages in memory. We will revisit this | |
3102 | // decision once we know the size of the segment. | |
a445fddf ILT |
3103 | |
3104 | addr = align_address(addr, (*p)->maximum_alignment()); | |
75f65a3e | 3105 | aligned_addr = addr; |
a445fddf | 3106 | |
a6577478 RÁE |
3107 | if ((addr & (abi_pagesize - 1)) != 0) |
3108 | addr = addr + abi_pagesize; | |
a445fddf ILT |
3109 | |
3110 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); | |
75f65a3e ILT |
3111 | } |
3112 | ||
8a5e3e08 ILT |
3113 | if (!parameters->options().nmagic() |
3114 | && !parameters->options().omagic()) | |
3115 | off = align_file_offset(off, addr, abi_pagesize); | |
661be1e2 ILT |
3116 | else if (load_seg == NULL) |
3117 | { | |
3118 | // This is -N or -n with a section script which prevents | |
3119 | // us from using a load segment. We need to ensure that | |
3120 | // the file offset is aligned to the alignment of the | |
3121 | // segment. This is because the linker script | |
3122 | // implicitly assumed a zero offset. If we don't align | |
3123 | // here, then the alignment of the sections in the | |
3124 | // linker script may not match the alignment of the | |
3125 | // sections in the set_section_addresses call below, | |
3126 | // causing an error about dot moving backward. | |
3127 | off = align_address(off, (*p)->maximum_alignment()); | |
3128 | } | |
8a5e3e08 | 3129 | |
ead1e424 | 3130 | unsigned int shndx_hold = *pshndx; |
fc497986 | 3131 | bool has_relro = false; |
96a2b4e4 | 3132 | uint64_t new_addr = (*p)->set_section_addresses(this, false, addr, |
fd064a5b | 3133 | &increase_relro, |
fc497986 | 3134 | &has_relro, |
96a2b4e4 | 3135 | &off, pshndx); |
75f65a3e ILT |
3136 | |
3137 | // Now that we know the size of this segment, we may be able | |
3138 | // to save a page in memory, at the cost of wasting some | |
3139 | // file space, by instead aligning to the start of a new | |
3140 | // page. Here we use the real machine page size rather than | |
fc497986 CC |
3141 | // the ABI mandated page size. If the segment has been |
3142 | // aligned so that the relro data ends at a page boundary, | |
3143 | // we do not try to realign it. | |
75f65a3e | 3144 | |
cdc29364 CC |
3145 | if (!are_addresses_set |
3146 | && !has_relro | |
3147 | && aligned_addr != addr | |
fb0e076f | 3148 | && !parameters->incremental()) |
75f65a3e | 3149 | { |
75f65a3e ILT |
3150 | uint64_t first_off = (common_pagesize |
3151 | - (aligned_addr | |
3152 | & (common_pagesize - 1))); | |
3153 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
3154 | if (first_off > 0 | |
3155 | && last_off > 0 | |
3156 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
3157 | != (new_addr & ~ (common_pagesize - 1))) | |
3158 | && first_off + last_off <= common_pagesize) | |
3159 | { | |
ead1e424 ILT |
3160 | *pshndx = shndx_hold; |
3161 | addr = align_address(aligned_addr, common_pagesize); | |
a445fddf | 3162 | addr = align_address(addr, (*p)->maximum_alignment()); |
75f65a3e | 3163 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
8a5e3e08 | 3164 | off = align_file_offset(off, addr, abi_pagesize); |
3bb951e5 ILT |
3165 | |
3166 | increase_relro = this->increase_relro_; | |
3167 | if (this->script_options_->saw_sections_clause()) | |
3168 | increase_relro = 0; | |
3169 | has_relro = false; | |
3170 | ||
96a2b4e4 | 3171 | new_addr = (*p)->set_section_addresses(this, true, addr, |
fd064a5b | 3172 | &increase_relro, |
fc497986 | 3173 | &has_relro, |
96a2b4e4 | 3174 | &off, pshndx); |
75f65a3e ILT |
3175 | } |
3176 | } | |
3177 | ||
3178 | addr = new_addr; | |
3179 | ||
34810851 ILT |
3180 | // Implement --check-sections. We know that the segments |
3181 | // are sorted by LMA. | |
3182 | if (check_sections && last_load_segment != NULL) | |
3183 | { | |
3184 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); | |
3185 | if (last_load_segment->paddr() + last_load_segment->memsz() | |
3186 | > (*p)->paddr()) | |
3187 | { | |
3188 | unsigned long long lb1 = last_load_segment->paddr(); | |
3189 | unsigned long long le1 = lb1 + last_load_segment->memsz(); | |
3190 | unsigned long long lb2 = (*p)->paddr(); | |
3191 | unsigned long long le2 = lb2 + (*p)->memsz(); | |
3192 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " | |
3193 | "[0x%llx -> 0x%llx]"), | |
3194 | lb1, le1, lb2, le2); | |
3195 | } | |
3196 | } | |
3197 | last_load_segment = *p; | |
75f65a3e ILT |
3198 | } |
3199 | } | |
3200 | ||
3201 | // Handle the non-PT_LOAD segments, setting their offsets from their | |
3202 | // section's offsets. | |
3203 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
3204 | p != this->segment_list_.end(); | |
3205 | ++p) | |
3206 | { | |
3207 | if ((*p)->type() != elfcpp::PT_LOAD) | |
1a2dff53 ILT |
3208 | (*p)->set_offset((*p)->type() == elfcpp::PT_GNU_RELRO |
3209 | ? increase_relro | |
3210 | : 0); | |
75f65a3e ILT |
3211 | } |
3212 | ||
7bf1f802 ILT |
3213 | // Set the TLS offsets for each section in the PT_TLS segment. |
3214 | if (this->tls_segment_ != NULL) | |
3215 | this->tls_segment_->set_tls_offsets(); | |
3216 | ||
75f65a3e ILT |
3217 | return off; |
3218 | } | |
3219 | ||
6a74a719 ILT |
3220 | // Set the offsets of all the allocated sections when doing a |
3221 | // relocatable link. This does the same jobs as set_segment_offsets, | |
3222 | // only for a relocatable link. | |
3223 | ||
3224 | off_t | |
3225 | Layout::set_relocatable_section_offsets(Output_data* file_header, | |
ca09d69a | 3226 | unsigned int* pshndx) |
6a74a719 ILT |
3227 | { |
3228 | off_t off = 0; | |
3229 | ||
3230 | file_header->set_address_and_file_offset(0, 0); | |
3231 | off += file_header->data_size(); | |
3232 | ||
3233 | for (Section_list::iterator p = this->section_list_.begin(); | |
3234 | p != this->section_list_.end(); | |
3235 | ++p) | |
3236 | { | |
3237 | // We skip unallocated sections here, except that group sections | |
3238 | // have to come first. | |
3239 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 | |
3240 | && (*p)->type() != elfcpp::SHT_GROUP) | |
3241 | continue; | |
3242 | ||
3243 | off = align_address(off, (*p)->addralign()); | |
3244 | ||
3245 | // The linker script might have set the address. | |
3246 | if (!(*p)->is_address_valid()) | |
3247 | (*p)->set_address(0); | |
3248 | (*p)->set_file_offset(off); | |
3249 | (*p)->finalize_data_size(); | |
3250 | off += (*p)->data_size(); | |
3251 | ||
3252 | (*p)->set_out_shndx(*pshndx); | |
3253 | ++*pshndx; | |
3254 | } | |
3255 | ||
3256 | return off; | |
3257 | } | |
3258 | ||
75f65a3e ILT |
3259 | // Set the file offset of all the sections not associated with a |
3260 | // segment. | |
3261 | ||
3262 | off_t | |
9a0910c3 | 3263 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 3264 | { |
cdc29364 CC |
3265 | off_t startoff = off; |
3266 | off_t maxoff = off; | |
3267 | ||
a3ad94ed ILT |
3268 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
3269 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
3270 | ++p) |
3271 | { | |
27bc2bce ILT |
3272 | // The symtab section is handled in create_symtab_sections. |
3273 | if (*p == this->symtab_section_) | |
61ba1cf9 | 3274 | continue; |
27bc2bce | 3275 | |
a9a60db6 ILT |
3276 | // If we've already set the data size, don't set it again. |
3277 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) | |
3278 | continue; | |
3279 | ||
96803768 ILT |
3280 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
3281 | && (*p)->requires_postprocessing()) | |
17a1d0a9 ILT |
3282 | { |
3283 | (*p)->create_postprocessing_buffer(); | |
3284 | this->any_postprocessing_sections_ = true; | |
3285 | } | |
96803768 | 3286 | |
9a0910c3 ILT |
3287 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
3288 | && (*p)->after_input_sections()) | |
3289 | continue; | |
17a1d0a9 | 3290 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
3291 | && (!(*p)->after_input_sections() |
3292 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
3293 | continue; | |
17a1d0a9 | 3294 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
3295 | && (!(*p)->after_input_sections() |
3296 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
3297 | continue; | |
27bc2bce | 3298 | |
cdc29364 CC |
3299 | if (!parameters->incremental_update()) |
3300 | { | |
3301 | off = align_address(off, (*p)->addralign()); | |
3302 | (*p)->set_file_offset(off); | |
3303 | (*p)->finalize_data_size(); | |
3304 | } | |
3305 | else | |
3306 | { | |
3307 | // Incremental update: allocate file space from free list. | |
3308 | (*p)->pre_finalize_data_size(); | |
3309 | off_t current_size = (*p)->current_data_size(); | |
3310 | off = this->allocate(current_size, (*p)->addralign(), startoff); | |
3311 | if (off == -1) | |
3312 | { | |
3313 | if (is_debugging_enabled(DEBUG_INCREMENTAL)) | |
3314 | this->free_list_.dump(); | |
3315 | gold_assert((*p)->output_section() != NULL); | |
e6455dfb CC |
3316 | gold_fallback(_("out of patch space for section %s; " |
3317 | "relink with --incremental-full"), | |
3318 | (*p)->output_section()->name()); | |
cdc29364 CC |
3319 | } |
3320 | (*p)->set_file_offset(off); | |
3321 | (*p)->finalize_data_size(); | |
3322 | if ((*p)->data_size() > current_size) | |
3323 | { | |
3324 | gold_assert((*p)->output_section() != NULL); | |
e6455dfb CC |
3325 | gold_fallback(_("%s: section changed size; " |
3326 | "relink with --incremental-full"), | |
3327 | (*p)->output_section()->name()); | |
cdc29364 CC |
3328 | } |
3329 | gold_debug(DEBUG_INCREMENTAL, | |
3330 | "set_section_offsets: %08lx %08lx %s", | |
3331 | static_cast<long>(off), | |
3332 | static_cast<long>((*p)->data_size()), | |
3333 | ((*p)->output_section() != NULL | |
3334 | ? (*p)->output_section()->name() : "(special)")); | |
3335 | } | |
3336 | ||
75f65a3e | 3337 | off += (*p)->data_size(); |
cdc29364 CC |
3338 | if (off > maxoff) |
3339 | maxoff = off; | |
96803768 ILT |
3340 | |
3341 | // At this point the name must be set. | |
17a1d0a9 | 3342 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
96803768 | 3343 | this->namepool_.add((*p)->name(), false, NULL); |
75f65a3e | 3344 | } |
cdc29364 | 3345 | return maxoff; |
75f65a3e ILT |
3346 | } |
3347 | ||
86887060 ILT |
3348 | // Set the section indexes of all the sections not associated with a |
3349 | // segment. | |
3350 | ||
3351 | unsigned int | |
3352 | Layout::set_section_indexes(unsigned int shndx) | |
3353 | { | |
3354 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
3355 | p != this->unattached_section_list_.end(); | |
3356 | ++p) | |
3357 | { | |
d491d34e ILT |
3358 | if (!(*p)->has_out_shndx()) |
3359 | { | |
3360 | (*p)->set_out_shndx(shndx); | |
3361 | ++shndx; | |
3362 | } | |
86887060 ILT |
3363 | } |
3364 | return shndx; | |
3365 | } | |
3366 | ||
a445fddf ILT |
3367 | // Set the section addresses according to the linker script. This is |
3368 | // only called when we see a SECTIONS clause. This returns the | |
3369 | // program segment which should hold the file header and segment | |
3370 | // headers, if any. It will return NULL if they should not be in a | |
3371 | // segment. | |
3372 | ||
3373 | Output_segment* | |
3374 | Layout::set_section_addresses_from_script(Symbol_table* symtab) | |
20e6d0d6 DK |
3375 | { |
3376 | Script_sections* ss = this->script_options_->script_sections(); | |
3377 | gold_assert(ss->saw_sections_clause()); | |
3378 | return this->script_options_->set_section_addresses(symtab, this); | |
3379 | } | |
3380 | ||
3381 | // Place the orphan sections in the linker script. | |
3382 | ||
3383 | void | |
3384 | Layout::place_orphan_sections_in_script() | |
a445fddf ILT |
3385 | { |
3386 | Script_sections* ss = this->script_options_->script_sections(); | |
3387 | gold_assert(ss->saw_sections_clause()); | |
3388 | ||
3389 | // Place each orphaned output section in the script. | |
3390 | for (Section_list::iterator p = this->section_list_.begin(); | |
3391 | p != this->section_list_.end(); | |
3392 | ++p) | |
3393 | { | |
3394 | if (!(*p)->found_in_sections_clause()) | |
3395 | ss->place_orphan(*p); | |
3396 | } | |
a445fddf ILT |
3397 | } |
3398 | ||
7bf1f802 ILT |
3399 | // Count the local symbols in the regular symbol table and the dynamic |
3400 | // symbol table, and build the respective string pools. | |
3401 | ||
3402 | void | |
17a1d0a9 ILT |
3403 | Layout::count_local_symbols(const Task* task, |
3404 | const Input_objects* input_objects) | |
7bf1f802 | 3405 | { |
6d013333 ILT |
3406 | // First, figure out an upper bound on the number of symbols we'll |
3407 | // be inserting into each pool. This helps us create the pools with | |
3408 | // the right size, to avoid unnecessary hashtable resizing. | |
3409 | unsigned int symbol_count = 0; | |
3410 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
3411 | p != input_objects->relobj_end(); | |
3412 | ++p) | |
3413 | symbol_count += (*p)->local_symbol_count(); | |
3414 | ||
3415 | // Go from "upper bound" to "estimate." We overcount for two | |
3416 | // reasons: we double-count symbols that occur in more than one | |
3417 | // object file, and we count symbols that are dropped from the | |
3418 | // output. Add it all together and assume we overcount by 100%. | |
3419 | symbol_count /= 2; | |
3420 | ||
3421 | // We assume all symbols will go into both the sympool and dynpool. | |
3422 | this->sympool_.reserve(symbol_count); | |
3423 | this->dynpool_.reserve(symbol_count); | |
3424 | ||
7bf1f802 ILT |
3425 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
3426 | p != input_objects->relobj_end(); | |
3427 | ++p) | |
3428 | { | |
17a1d0a9 | 3429 | Task_lock_obj<Object> tlo(task, *p); |
7bf1f802 ILT |
3430 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
3431 | } | |
3432 | } | |
3433 | ||
b8e6aad9 ILT |
3434 | // Create the symbol table sections. Here we also set the final |
3435 | // values of the symbols. At this point all the loadable sections are | |
d491d34e | 3436 | // fully laid out. SHNUM is the number of sections so far. |
75f65a3e ILT |
3437 | |
3438 | void | |
9025d29d | 3439 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 3440 | Symbol_table* symtab, |
d491d34e | 3441 | unsigned int shnum, |
16649710 | 3442 | off_t* poff) |
75f65a3e | 3443 | { |
61ba1cf9 ILT |
3444 | int symsize; |
3445 | unsigned int align; | |
8851ecca | 3446 | if (parameters->target().get_size() == 32) |
61ba1cf9 ILT |
3447 | { |
3448 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
3449 | align = 4; | |
3450 | } | |
8851ecca | 3451 | else if (parameters->target().get_size() == 64) |
61ba1cf9 ILT |
3452 | { |
3453 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
3454 | align = 8; | |
3455 | } | |
3456 | else | |
a3ad94ed | 3457 | gold_unreachable(); |
61ba1cf9 | 3458 | |
cdc29364 CC |
3459 | // Compute file offsets relative to the start of the symtab section. |
3460 | off_t off = 0; | |
61ba1cf9 ILT |
3461 | |
3462 | // Save space for the dummy symbol at the start of the section. We | |
3463 | // never bother to write this out--it will just be left as zero. | |
3464 | off += symsize; | |
c06b7b0b | 3465 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 3466 | |
a3ad94ed ILT |
3467 | // Add STT_SECTION symbols for each Output section which needs one. |
3468 | for (Section_list::iterator p = this->section_list_.begin(); | |
3469 | p != this->section_list_.end(); | |
3470 | ++p) | |
3471 | { | |
3472 | if (!(*p)->needs_symtab_index()) | |
3473 | (*p)->set_symtab_index(-1U); | |
3474 | else | |
3475 | { | |
3476 | (*p)->set_symtab_index(local_symbol_index); | |
3477 | ++local_symbol_index; | |
3478 | off += symsize; | |
3479 | } | |
3480 | } | |
3481 | ||
f6ce93d6 ILT |
3482 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
3483 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
3484 | ++p) |
3485 | { | |
c06b7b0b | 3486 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
ef15dade | 3487 | off, symtab); |
c06b7b0b ILT |
3488 | off += (index - local_symbol_index) * symsize; |
3489 | local_symbol_index = index; | |
75f65a3e ILT |
3490 | } |
3491 | ||
c06b7b0b | 3492 | unsigned int local_symcount = local_symbol_index; |
cdc29364 | 3493 | gold_assert(static_cast<off_t>(local_symcount * symsize) == off); |
61ba1cf9 | 3494 | |
16649710 ILT |
3495 | off_t dynoff; |
3496 | size_t dyn_global_index; | |
3497 | size_t dyncount; | |
3498 | if (this->dynsym_section_ == NULL) | |
3499 | { | |
3500 | dynoff = 0; | |
3501 | dyn_global_index = 0; | |
3502 | dyncount = 0; | |
3503 | } | |
3504 | else | |
3505 | { | |
3506 | dyn_global_index = this->dynsym_section_->info(); | |
3507 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); | |
3508 | dynoff = this->dynsym_section_->offset() + locsize; | |
3509 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 3510 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
3511 | == this->dynsym_section_->data_size() - locsize); |
3512 | } | |
3513 | ||
cdc29364 | 3514 | off_t global_off = off; |
55a93433 ILT |
3515 | off = symtab->finalize(off, dynoff, dyn_global_index, dyncount, |
3516 | &this->sympool_, &local_symcount); | |
75f65a3e | 3517 | |
8851ecca | 3518 | if (!parameters->options().strip_all()) |
9e2dcb77 ILT |
3519 | { |
3520 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 3521 | |
cfd73a4e | 3522 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
3523 | Output_section* osymtab = this->make_output_section(symtab_name, |
3524 | elfcpp::SHT_SYMTAB, | |
22f0da72 ILT |
3525 | 0, ORDER_INVALID, |
3526 | false); | |
9e2dcb77 | 3527 | this->symtab_section_ = osymtab; |
a3ad94ed | 3528 | |
cdc29364 | 3529 | Output_section_data* pos = new Output_data_fixed_space(off, align, |
7d9e3d98 | 3530 | "** symtab"); |
9e2dcb77 | 3531 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 3532 | |
d491d34e ILT |
3533 | // We generate a .symtab_shndx section if we have more than |
3534 | // SHN_LORESERVE sections. Technically it is possible that we | |
3535 | // don't need one, because it is possible that there are no | |
3536 | // symbols in any of sections with indexes larger than | |
3537 | // SHN_LORESERVE. That is probably unusual, though, and it is | |
3538 | // easier to always create one than to compute section indexes | |
3539 | // twice (once here, once when writing out the symbols). | |
3540 | if (shnum >= elfcpp::SHN_LORESERVE) | |
3541 | { | |
3542 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", | |
3543 | false, NULL); | |
3544 | Output_section* osymtab_xindex = | |
3545 | this->make_output_section(symtab_xindex_name, | |
22f0da72 ILT |
3546 | elfcpp::SHT_SYMTAB_SHNDX, 0, |
3547 | ORDER_INVALID, false); | |
d491d34e | 3548 | |
cdc29364 | 3549 | size_t symcount = off / symsize; |
d491d34e ILT |
3550 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); |
3551 | ||
3552 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); | |
3553 | ||
3554 | osymtab_xindex->set_link_section(osymtab); | |
3555 | osymtab_xindex->set_addralign(4); | |
3556 | osymtab_xindex->set_entsize(4); | |
3557 | ||
3558 | osymtab_xindex->set_after_input_sections(); | |
3559 | ||
3560 | // This tells the driver code to wait until the symbol table | |
3561 | // has written out before writing out the postprocessing | |
3562 | // sections, including the .symtab_shndx section. | |
3563 | this->any_postprocessing_sections_ = true; | |
3564 | } | |
3565 | ||
cfd73a4e | 3566 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
3567 | Output_section* ostrtab = this->make_output_section(strtab_name, |
3568 | elfcpp::SHT_STRTAB, | |
22f0da72 ILT |
3569 | 0, ORDER_INVALID, |
3570 | false); | |
a3ad94ed | 3571 | |
9e2dcb77 ILT |
3572 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
3573 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 3574 | |
cdc29364 CC |
3575 | off_t symtab_off; |
3576 | if (!parameters->incremental_update()) | |
3577 | symtab_off = align_address(*poff, align); | |
3578 | else | |
3579 | { | |
3580 | symtab_off = this->allocate(off, align, *poff); | |
3581 | if (off == -1) | |
e6455dfb CC |
3582 | gold_fallback(_("out of patch space for symbol table; " |
3583 | "relink with --incremental-full")); | |
cdc29364 CC |
3584 | gold_debug(DEBUG_INCREMENTAL, |
3585 | "create_symtab_sections: %08lx %08lx .symtab", | |
3586 | static_cast<long>(symtab_off), | |
3587 | static_cast<long>(off)); | |
3588 | } | |
3589 | ||
3590 | symtab->set_file_offset(symtab_off + global_off); | |
3591 | osymtab->set_file_offset(symtab_off); | |
27bc2bce | 3592 | osymtab->finalize_data_size(); |
9e2dcb77 ILT |
3593 | osymtab->set_link_section(ostrtab); |
3594 | osymtab->set_info(local_symcount); | |
3595 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 3596 | |
cdc29364 CC |
3597 | if (symtab_off + off > *poff) |
3598 | *poff = symtab_off + off; | |
9e2dcb77 | 3599 | } |
75f65a3e ILT |
3600 | } |
3601 | ||
3602 | // Create the .shstrtab section, which holds the names of the | |
3603 | // sections. At the time this is called, we have created all the | |
3604 | // output sections except .shstrtab itself. | |
3605 | ||
3606 | Output_section* | |
3607 | Layout::create_shstrtab() | |
3608 | { | |
3609 | // FIXME: We don't need to create a .shstrtab section if we are | |
3610 | // stripping everything. | |
3611 | ||
cfd73a4e | 3612 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 3613 | |
f5c870d2 | 3614 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0, |
22f0da72 | 3615 | ORDER_INVALID, false); |
75f65a3e | 3616 | |
0e0d5469 ILT |
3617 | if (strcmp(parameters->options().compress_debug_sections(), "none") != 0) |
3618 | { | |
3619 | // We can't write out this section until we've set all the | |
3620 | // section names, and we don't set the names of compressed | |
3621 | // output sections until relocations are complete. FIXME: With | |
3622 | // the current names we use, this is unnecessary. | |
3623 | os->set_after_input_sections(); | |
3624 | } | |
27bc2bce | 3625 | |
a3ad94ed ILT |
3626 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
3627 | os->add_output_section_data(posd); | |
75f65a3e ILT |
3628 | |
3629 | return os; | |
3630 | } | |
3631 | ||
3632 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
3633 | // offset. | |
3634 | ||
27bc2bce | 3635 | void |
d491d34e | 3636 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
75f65a3e ILT |
3637 | { |
3638 | Output_section_headers* oshdrs; | |
9025d29d | 3639 | oshdrs = new Output_section_headers(this, |
16649710 | 3640 | &this->segment_list_, |
6a74a719 | 3641 | &this->section_list_, |
16649710 | 3642 | &this->unattached_section_list_, |
d491d34e ILT |
3643 | &this->namepool_, |
3644 | shstrtab_section); | |
cdc29364 CC |
3645 | off_t off; |
3646 | if (!parameters->incremental_update()) | |
3647 | off = align_address(*poff, oshdrs->addralign()); | |
3648 | else | |
3649 | { | |
3650 | oshdrs->pre_finalize_data_size(); | |
3651 | off = this->allocate(oshdrs->data_size(), oshdrs->addralign(), *poff); | |
3652 | if (off == -1) | |
e6455dfb CC |
3653 | gold_fallback(_("out of patch space for section header table; " |
3654 | "relink with --incremental-full")); | |
cdc29364 CC |
3655 | gold_debug(DEBUG_INCREMENTAL, |
3656 | "create_shdrs: %08lx %08lx (section header table)", | |
3657 | static_cast<long>(off), | |
3658 | static_cast<long>(off + oshdrs->data_size())); | |
3659 | } | |
27bc2bce | 3660 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 | 3661 | off += oshdrs->data_size(); |
cdc29364 CC |
3662 | if (off > *poff) |
3663 | *poff = off; | |
27bc2bce | 3664 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
3665 | } |
3666 | ||
d491d34e ILT |
3667 | // Count the allocated sections. |
3668 | ||
3669 | size_t | |
3670 | Layout::allocated_output_section_count() const | |
3671 | { | |
3672 | size_t section_count = 0; | |
3673 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3674 | p != this->segment_list_.end(); | |
3675 | ++p) | |
3676 | section_count += (*p)->output_section_count(); | |
3677 | return section_count; | |
3678 | } | |
3679 | ||
dbe717ef ILT |
3680 | // Create the dynamic symbol table. |
3681 | ||
3682 | void | |
7bf1f802 | 3683 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
9b07f471 | 3684 | Symbol_table* symtab, |
ca09d69a | 3685 | Output_section** pdynstr, |
14b31740 ILT |
3686 | unsigned int* plocal_dynamic_count, |
3687 | std::vector<Symbol*>* pdynamic_symbols, | |
3688 | Versions* pversions) | |
dbe717ef | 3689 | { |
a3ad94ed ILT |
3690 | // Count all the symbols in the dynamic symbol table, and set the |
3691 | // dynamic symbol indexes. | |
dbe717ef | 3692 | |
a3ad94ed ILT |
3693 | // Skip symbol 0, which is always all zeroes. |
3694 | unsigned int index = 1; | |
dbe717ef | 3695 | |
a3ad94ed ILT |
3696 | // Add STT_SECTION symbols for each Output section which needs one. |
3697 | for (Section_list::iterator p = this->section_list_.begin(); | |
3698 | p != this->section_list_.end(); | |
3699 | ++p) | |
3700 | { | |
3701 | if (!(*p)->needs_dynsym_index()) | |
3702 | (*p)->set_dynsym_index(-1U); | |
3703 | else | |
3704 | { | |
3705 | (*p)->set_dynsym_index(index); | |
3706 | ++index; | |
3707 | } | |
3708 | } | |
3709 | ||
7bf1f802 ILT |
3710 | // Count the local symbols that need to go in the dynamic symbol table, |
3711 | // and set the dynamic symbol indexes. | |
3712 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
3713 | p != input_objects->relobj_end(); | |
3714 | ++p) | |
3715 | { | |
3716 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
3717 | index = new_index; | |
3718 | } | |
a3ad94ed ILT |
3719 | |
3720 | unsigned int local_symcount = index; | |
14b31740 | 3721 | *plocal_dynamic_count = local_symcount; |
a3ad94ed | 3722 | |
9b07f471 | 3723 | index = symtab->set_dynsym_indexes(index, pdynamic_symbols, |
35cdfc9a | 3724 | &this->dynpool_, pversions); |
a3ad94ed ILT |
3725 | |
3726 | int symsize; | |
3727 | unsigned int align; | |
8851ecca | 3728 | const int size = parameters->target().get_size(); |
a3ad94ed ILT |
3729 | if (size == 32) |
3730 | { | |
3731 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
3732 | align = 4; | |
3733 | } | |
3734 | else if (size == 64) | |
3735 | { | |
3736 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
3737 | align = 8; | |
3738 | } | |
3739 | else | |
3740 | gold_unreachable(); | |
3741 | ||
14b31740 ILT |
3742 | // Create the dynamic symbol table section. |
3743 | ||
3802b2dd ILT |
3744 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
3745 | elfcpp::SHT_DYNSYM, | |
3746 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
3747 | false, |
3748 | ORDER_DYNAMIC_LINKER, | |
3749 | false); | |
a3ad94ed | 3750 | |
6daf5215 ILT |
3751 | // Check for NULL as a linker script may discard .dynsym. |
3752 | if (dynsym != NULL) | |
3753 | { | |
3754 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, | |
3755 | align, | |
3756 | "** dynsym"); | |
3757 | dynsym->add_output_section_data(odata); | |
a3ad94ed | 3758 | |
6daf5215 ILT |
3759 | dynsym->set_info(local_symcount); |
3760 | dynsym->set_entsize(symsize); | |
3761 | dynsym->set_addralign(align); | |
a3ad94ed | 3762 | |
6daf5215 ILT |
3763 | this->dynsym_section_ = dynsym; |
3764 | } | |
a3ad94ed | 3765 | |
16649710 | 3766 | Output_data_dynamic* const odyn = this->dynamic_data_; |
6daf5215 ILT |
3767 | if (odyn != NULL) |
3768 | { | |
3769 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); | |
3770 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
3771 | } | |
a3ad94ed | 3772 | |
d491d34e ILT |
3773 | // If there are more than SHN_LORESERVE allocated sections, we |
3774 | // create a .dynsym_shndx section. It is possible that we don't | |
3775 | // need one, because it is possible that there are no dynamic | |
3776 | // symbols in any of the sections with indexes larger than | |
3777 | // SHN_LORESERVE. This is probably unusual, though, and at this | |
3778 | // time we don't know the actual section indexes so it is | |
3779 | // inconvenient to check. | |
3780 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) | |
3781 | { | |
2ea97941 | 3782 | Output_section* dynsym_xindex = |
d491d34e ILT |
3783 | this->choose_output_section(NULL, ".dynsym_shndx", |
3784 | elfcpp::SHT_SYMTAB_SHNDX, | |
3785 | elfcpp::SHF_ALLOC, | |
22f0da72 | 3786 | false, ORDER_DYNAMIC_LINKER, false); |
d491d34e | 3787 | |
6daf5215 ILT |
3788 | if (dynsym_xindex != NULL) |
3789 | { | |
3790 | this->dynsym_xindex_ = new Output_symtab_xindex(index); | |
d491d34e | 3791 | |
6daf5215 | 3792 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); |
d491d34e | 3793 | |
6daf5215 ILT |
3794 | dynsym_xindex->set_link_section(dynsym); |
3795 | dynsym_xindex->set_addralign(4); | |
3796 | dynsym_xindex->set_entsize(4); | |
d491d34e | 3797 | |
6daf5215 | 3798 | dynsym_xindex->set_after_input_sections(); |
d491d34e | 3799 | |
6daf5215 ILT |
3800 | // This tells the driver code to wait until the symbol table |
3801 | // has written out before writing out the postprocessing | |
3802 | // sections, including the .dynsym_shndx section. | |
3803 | this->any_postprocessing_sections_ = true; | |
3804 | } | |
d491d34e ILT |
3805 | } |
3806 | ||
14b31740 ILT |
3807 | // Create the dynamic string table section. |
3808 | ||
3802b2dd ILT |
3809 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
3810 | elfcpp::SHT_STRTAB, | |
3811 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
3812 | false, |
3813 | ORDER_DYNAMIC_LINKER, | |
3814 | false); | |
a3ad94ed | 3815 | |
6daf5215 ILT |
3816 | if (dynstr != NULL) |
3817 | { | |
3818 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
3819 | dynstr->add_output_section_data(strdata); | |
a3ad94ed | 3820 | |
6daf5215 ILT |
3821 | if (dynsym != NULL) |
3822 | dynsym->set_link_section(dynstr); | |
3823 | if (this->dynamic_section_ != NULL) | |
3824 | this->dynamic_section_->set_link_section(dynstr); | |
16649710 | 3825 | |
6daf5215 ILT |
3826 | if (odyn != NULL) |
3827 | { | |
3828 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); | |
3829 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
3830 | } | |
a3ad94ed | 3831 | |
6daf5215 ILT |
3832 | *pdynstr = dynstr; |
3833 | } | |
14b31740 ILT |
3834 | |
3835 | // Create the hash tables. | |
3836 | ||
13670ee6 ILT |
3837 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
3838 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
3839 | { | |
3840 | unsigned char* phash; | |
3841 | unsigned int hashlen; | |
3842 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, | |
3843 | &phash, &hashlen); | |
3844 | ||
22f0da72 ILT |
3845 | Output_section* hashsec = |
3846 | this->choose_output_section(NULL, ".hash", elfcpp::SHT_HASH, | |
3847 | elfcpp::SHF_ALLOC, false, | |
3848 | ORDER_DYNAMIC_LINKER, false); | |
13670ee6 ILT |
3849 | |
3850 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
3851 | hashlen, | |
7d9e3d98 ILT |
3852 | align, |
3853 | "** hash"); | |
6daf5215 ILT |
3854 | if (hashsec != NULL && hashdata != NULL) |
3855 | hashsec->add_output_section_data(hashdata); | |
13670ee6 | 3856 | |
6daf5215 ILT |
3857 | if (hashsec != NULL) |
3858 | { | |
3859 | if (dynsym != NULL) | |
3860 | hashsec->set_link_section(dynsym); | |
3861 | hashsec->set_entsize(4); | |
3862 | } | |
a3ad94ed | 3863 | |
6daf5215 ILT |
3864 | if (odyn != NULL) |
3865 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); | |
13670ee6 ILT |
3866 | } |
3867 | ||
3868 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 | |
3869 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
3870 | { | |
3871 | unsigned char* phash; | |
3872 | unsigned int hashlen; | |
3873 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, local_symcount, | |
3874 | &phash, &hashlen); | |
a3ad94ed | 3875 | |
22f0da72 ILT |
3876 | Output_section* hashsec = |
3877 | this->choose_output_section(NULL, ".gnu.hash", elfcpp::SHT_GNU_HASH, | |
3878 | elfcpp::SHF_ALLOC, false, | |
3879 | ORDER_DYNAMIC_LINKER, false); | |
a3ad94ed | 3880 | |
13670ee6 ILT |
3881 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
3882 | hashlen, | |
7d9e3d98 ILT |
3883 | align, |
3884 | "** hash"); | |
6daf5215 ILT |
3885 | if (hashsec != NULL && hashdata != NULL) |
3886 | hashsec->add_output_section_data(hashdata); | |
a3ad94ed | 3887 | |
6daf5215 ILT |
3888 | if (hashsec != NULL) |
3889 | { | |
3890 | if (dynsym != NULL) | |
3891 | hashsec->set_link_section(dynsym); | |
1b81fb71 | 3892 | |
6daf5215 ILT |
3893 | // For a 64-bit target, the entries in .gnu.hash do not have |
3894 | // a uniform size, so we only set the entry size for a | |
3895 | // 32-bit target. | |
3896 | if (parameters->target().get_size() == 32) | |
3897 | hashsec->set_entsize(4); | |
a3ad94ed | 3898 | |
6daf5215 ILT |
3899 | if (odyn != NULL) |
3900 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); | |
3901 | } | |
13670ee6 | 3902 | } |
dbe717ef ILT |
3903 | } |
3904 | ||
7bf1f802 ILT |
3905 | // Assign offsets to each local portion of the dynamic symbol table. |
3906 | ||
3907 | void | |
3908 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
3909 | { | |
3910 | Output_section* dynsym = this->dynsym_section_; | |
6daf5215 ILT |
3911 | if (dynsym == NULL) |
3912 | return; | |
7bf1f802 ILT |
3913 | |
3914 | off_t off = dynsym->offset(); | |
3915 | ||
3916 | // Skip the dummy symbol at the start of the section. | |
3917 | off += dynsym->entsize(); | |
3918 | ||
3919 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
3920 | p != input_objects->relobj_end(); | |
3921 | ++p) | |
3922 | { | |
3923 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
3924 | off += count * dynsym->entsize(); | |
3925 | } | |
3926 | } | |
3927 | ||
14b31740 ILT |
3928 | // Create the version sections. |
3929 | ||
3930 | void | |
9025d29d | 3931 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 3932 | const Symbol_table* symtab, |
14b31740 ILT |
3933 | unsigned int local_symcount, |
3934 | const std::vector<Symbol*>& dynamic_symbols, | |
3935 | const Output_section* dynstr) | |
3936 | { | |
3937 | if (!versions->any_defs() && !versions->any_needs()) | |
3938 | return; | |
3939 | ||
8851ecca | 3940 | switch (parameters->size_and_endianness()) |
14b31740 | 3941 | { |
193a53d9 | 3942 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 3943 | case Parameters::TARGET_32_LITTLE: |
7d1a9ebb ILT |
3944 | this->sized_create_version_sections<32, false>(versions, symtab, |
3945 | local_symcount, | |
3946 | dynamic_symbols, dynstr); | |
8851ecca | 3947 | break; |
193a53d9 | 3948 | #endif |
8851ecca ILT |
3949 | #ifdef HAVE_TARGET_32_BIG |
3950 | case Parameters::TARGET_32_BIG: | |
7d1a9ebb ILT |
3951 | this->sized_create_version_sections<32, true>(versions, symtab, |
3952 | local_symcount, | |
3953 | dynamic_symbols, dynstr); | |
8851ecca | 3954 | break; |
193a53d9 | 3955 | #endif |
193a53d9 | 3956 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 3957 | case Parameters::TARGET_64_LITTLE: |
7d1a9ebb ILT |
3958 | this->sized_create_version_sections<64, false>(versions, symtab, |
3959 | local_symcount, | |
3960 | dynamic_symbols, dynstr); | |
8851ecca | 3961 | break; |
193a53d9 | 3962 | #endif |
8851ecca ILT |
3963 | #ifdef HAVE_TARGET_64_BIG |
3964 | case Parameters::TARGET_64_BIG: | |
7d1a9ebb ILT |
3965 | this->sized_create_version_sections<64, true>(versions, symtab, |
3966 | local_symcount, | |
3967 | dynamic_symbols, dynstr); | |
8851ecca ILT |
3968 | break; |
3969 | #endif | |
3970 | default: | |
3971 | gold_unreachable(); | |
14b31740 | 3972 | } |
14b31740 ILT |
3973 | } |
3974 | ||
3975 | // Create the version sections, sized version. | |
3976 | ||
3977 | template<int size, bool big_endian> | |
3978 | void | |
3979 | Layout::sized_create_version_sections( | |
3980 | const Versions* versions, | |
46fe1623 | 3981 | const Symbol_table* symtab, |
14b31740 ILT |
3982 | unsigned int local_symcount, |
3983 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 3984 | const Output_section* dynstr) |
14b31740 | 3985 | { |
3802b2dd ILT |
3986 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
3987 | elfcpp::SHT_GNU_versym, | |
3988 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
3989 | false, |
3990 | ORDER_DYNAMIC_LINKER, | |
3991 | false); | |
14b31740 | 3992 | |
6daf5215 ILT |
3993 | // Check for NULL since a linker script may discard this section. |
3994 | if (vsec != NULL) | |
3995 | { | |
3996 | unsigned char* vbuf; | |
3997 | unsigned int vsize; | |
3998 | versions->symbol_section_contents<size, big_endian>(symtab, | |
3999 | &this->dynpool_, | |
4000 | local_symcount, | |
4001 | dynamic_symbols, | |
4002 | &vbuf, &vsize); | |
4003 | ||
4004 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, | |
4005 | "** versions"); | |
4006 | ||
4007 | vsec->add_output_section_data(vdata); | |
4008 | vsec->set_entsize(2); | |
4009 | vsec->set_link_section(this->dynsym_section_); | |
4010 | } | |
14b31740 ILT |
4011 | |
4012 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
6daf5215 ILT |
4013 | if (odyn != NULL && vsec != NULL) |
4014 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
14b31740 ILT |
4015 | |
4016 | if (versions->any_defs()) | |
4017 | { | |
3802b2dd | 4018 | Output_section* vdsec; |
6daf5215 ILT |
4019 | vdsec = this->choose_output_section(NULL, ".gnu.version_d", |
4020 | elfcpp::SHT_GNU_verdef, | |
4021 | elfcpp::SHF_ALLOC, | |
4022 | false, ORDER_DYNAMIC_LINKER, false); | |
4023 | ||
4024 | if (vdsec != NULL) | |
4025 | { | |
4026 | unsigned char* vdbuf; | |
4027 | unsigned int vdsize; | |
4028 | unsigned int vdentries; | |
4029 | versions->def_section_contents<size, big_endian>(&this->dynpool_, | |
4030 | &vdbuf, &vdsize, | |
4031 | &vdentries); | |
4032 | ||
4033 | Output_section_data* vddata = | |
4034 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); | |
4035 | ||
4036 | vdsec->add_output_section_data(vddata); | |
4037 | vdsec->set_link_section(dynstr); | |
4038 | vdsec->set_info(vdentries); | |
4039 | ||
4040 | if (odyn != NULL) | |
4041 | { | |
4042 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
4043 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
4044 | } | |
4045 | } | |
14b31740 ILT |
4046 | } |
4047 | ||
4048 | if (versions->any_needs()) | |
4049 | { | |
14b31740 | 4050 | Output_section* vnsec; |
3802b2dd ILT |
4051 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
4052 | elfcpp::SHT_GNU_verneed, | |
4053 | elfcpp::SHF_ALLOC, | |
22f0da72 | 4054 | false, ORDER_DYNAMIC_LINKER, false); |
14b31740 | 4055 | |
6daf5215 ILT |
4056 | if (vnsec != NULL) |
4057 | { | |
4058 | unsigned char* vnbuf; | |
4059 | unsigned int vnsize; | |
4060 | unsigned int vnentries; | |
4061 | versions->need_section_contents<size, big_endian>(&this->dynpool_, | |
4062 | &vnbuf, &vnsize, | |
4063 | &vnentries); | |
14b31740 | 4064 | |
6daf5215 ILT |
4065 | Output_section_data* vndata = |
4066 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); | |
14b31740 | 4067 | |
6daf5215 ILT |
4068 | vnsec->add_output_section_data(vndata); |
4069 | vnsec->set_link_section(dynstr); | |
4070 | vnsec->set_info(vnentries); | |
14b31740 | 4071 | |
6daf5215 ILT |
4072 | if (odyn != NULL) |
4073 | { | |
4074 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
4075 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
4076 | } | |
4077 | } | |
14b31740 ILT |
4078 | } |
4079 | } | |
4080 | ||
dbe717ef ILT |
4081 | // Create the .interp section and PT_INTERP segment. |
4082 | ||
4083 | void | |
4084 | Layout::create_interp(const Target* target) | |
4085 | { | |
10b4f102 ILT |
4086 | gold_assert(this->interp_segment_ == NULL); |
4087 | ||
e55bde5e | 4088 | const char* interp = parameters->options().dynamic_linker(); |
dbe717ef ILT |
4089 | if (interp == NULL) |
4090 | { | |
4091 | interp = target->dynamic_linker(); | |
a3ad94ed | 4092 | gold_assert(interp != NULL); |
dbe717ef ILT |
4093 | } |
4094 | ||
4095 | size_t len = strlen(interp) + 1; | |
4096 | ||
4097 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
4098 | ||
e1f74f98 ILT |
4099 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
4100 | elfcpp::SHT_PROGBITS, | |
4101 | elfcpp::SHF_ALLOC, | |
4102 | false, ORDER_INTERP, | |
4103 | false); | |
6daf5215 ILT |
4104 | if (osec != NULL) |
4105 | osec->add_output_section_data(odata); | |
dbe717ef ILT |
4106 | } |
4107 | ||
ea715a34 ILT |
4108 | // Add dynamic tags for the PLT and the dynamic relocs. This is |
4109 | // called by the target-specific code. This does nothing if not doing | |
4110 | // a dynamic link. | |
4111 | ||
4112 | // USE_REL is true for REL relocs rather than RELA relocs. | |
4113 | ||
4114 | // If PLT_GOT is not NULL, then DT_PLTGOT points to it. | |
4115 | ||
4116 | // If PLT_REL is not NULL, it is used for DT_PLTRELSZ, and DT_JMPREL, | |
e291e7b9 ILT |
4117 | // and we also set DT_PLTREL. We use PLT_REL's output section, since |
4118 | // some targets have multiple reloc sections in PLT_REL. | |
ea715a34 ILT |
4119 | |
4120 | // If DYN_REL is not NULL, it is used for DT_REL/DT_RELA, | |
67181c72 ILT |
4121 | // DT_RELSZ/DT_RELASZ, DT_RELENT/DT_RELAENT. Again we use the output |
4122 | // section. | |
ea715a34 ILT |
4123 | |
4124 | // If ADD_DEBUG is true, we add a DT_DEBUG entry when generating an | |
4125 | // executable. | |
4126 | ||
4127 | void | |
4128 | Layout::add_target_dynamic_tags(bool use_rel, const Output_data* plt_got, | |
4129 | const Output_data* plt_rel, | |
3a44184e | 4130 | const Output_data_reloc_generic* dyn_rel, |
612a8d3d | 4131 | bool add_debug, bool dynrel_includes_plt) |
ea715a34 ILT |
4132 | { |
4133 | Output_data_dynamic* odyn = this->dynamic_data_; | |
4134 | if (odyn == NULL) | |
4135 | return; | |
4136 | ||
4137 | if (plt_got != NULL && plt_got->output_section() != NULL) | |
4138 | odyn->add_section_address(elfcpp::DT_PLTGOT, plt_got); | |
4139 | ||
4140 | if (plt_rel != NULL && plt_rel->output_section() != NULL) | |
4141 | { | |
e291e7b9 ILT |
4142 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, plt_rel->output_section()); |
4143 | odyn->add_section_address(elfcpp::DT_JMPREL, plt_rel->output_section()); | |
ea715a34 ILT |
4144 | odyn->add_constant(elfcpp::DT_PLTREL, |
4145 | use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA); | |
4146 | } | |
4147 | ||
4148 | if (dyn_rel != NULL && dyn_rel->output_section() != NULL) | |
4149 | { | |
4150 | odyn->add_section_address(use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA, | |
67181c72 ILT |
4151 | dyn_rel->output_section()); |
4152 | if (plt_rel != NULL | |
4153 | && plt_rel->output_section() != NULL | |
4154 | && dynrel_includes_plt) | |
612a8d3d | 4155 | odyn->add_section_size(use_rel ? elfcpp::DT_RELSZ : elfcpp::DT_RELASZ, |
67181c72 ILT |
4156 | dyn_rel->output_section(), |
4157 | plt_rel->output_section()); | |
612a8d3d DM |
4158 | else |
4159 | odyn->add_section_size(use_rel ? elfcpp::DT_RELSZ : elfcpp::DT_RELASZ, | |
67181c72 | 4160 | dyn_rel->output_section()); |
ea715a34 ILT |
4161 | const int size = parameters->target().get_size(); |
4162 | elfcpp::DT rel_tag; | |
4163 | int rel_size; | |
4164 | if (use_rel) | |
4165 | { | |
4166 | rel_tag = elfcpp::DT_RELENT; | |
4167 | if (size == 32) | |
4168 | rel_size = Reloc_types<elfcpp::SHT_REL, 32, false>::reloc_size; | |
4169 | else if (size == 64) | |
4170 | rel_size = Reloc_types<elfcpp::SHT_REL, 64, false>::reloc_size; | |
4171 | else | |
4172 | gold_unreachable(); | |
4173 | } | |
4174 | else | |
4175 | { | |
4176 | rel_tag = elfcpp::DT_RELAENT; | |
4177 | if (size == 32) | |
4178 | rel_size = Reloc_types<elfcpp::SHT_RELA, 32, false>::reloc_size; | |
4179 | else if (size == 64) | |
4180 | rel_size = Reloc_types<elfcpp::SHT_RELA, 64, false>::reloc_size; | |
4181 | else | |
4182 | gold_unreachable(); | |
4183 | } | |
4184 | odyn->add_constant(rel_tag, rel_size); | |
3a44184e ILT |
4185 | |
4186 | if (parameters->options().combreloc()) | |
4187 | { | |
4188 | size_t c = dyn_rel->relative_reloc_count(); | |
4189 | if (c > 0) | |
4190 | odyn->add_constant((use_rel | |
4191 | ? elfcpp::DT_RELCOUNT | |
4192 | : elfcpp::DT_RELACOUNT), | |
4193 | c); | |
4194 | } | |
ea715a34 ILT |
4195 | } |
4196 | ||
4197 | if (add_debug && !parameters->options().shared()) | |
4198 | { | |
4199 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
4200 | // linker at run time, and used by the debugger. | |
4201 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
4202 | } | |
4203 | } | |
4204 | ||
a3ad94ed ILT |
4205 | // Finish the .dynamic section and PT_DYNAMIC segment. |
4206 | ||
4207 | void | |
4208 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 4209 | const Symbol_table* symtab) |
a3ad94ed | 4210 | { |
6daf5215 ILT |
4211 | if (!this->script_options_->saw_phdrs_clause() |
4212 | && this->dynamic_section_ != NULL) | |
1c4f3631 ILT |
4213 | { |
4214 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, | |
4215 | (elfcpp::PF_R | |
4216 | | elfcpp::PF_W)); | |
22f0da72 ILT |
4217 | oseg->add_output_section_to_nonload(this->dynamic_section_, |
4218 | elfcpp::PF_R | elfcpp::PF_W); | |
1c4f3631 | 4219 | } |
a3ad94ed | 4220 | |
16649710 | 4221 | Output_data_dynamic* const odyn = this->dynamic_data_; |
6daf5215 ILT |
4222 | if (odyn == NULL) |
4223 | return; | |
16649710 | 4224 | |
a3ad94ed ILT |
4225 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
4226 | p != input_objects->dynobj_end(); | |
4227 | ++p) | |
4228 | { | |
0f1c85a6 | 4229 | if (!(*p)->is_needed() && (*p)->as_needed()) |
594c8e5e ILT |
4230 | { |
4231 | // This dynamic object was linked with --as-needed, but it | |
4232 | // is not needed. | |
4233 | continue; | |
4234 | } | |
4235 | ||
a3ad94ed ILT |
4236 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); |
4237 | } | |
4238 | ||
8851ecca | 4239 | if (parameters->options().shared()) |
fced7afd | 4240 | { |
e55bde5e | 4241 | const char* soname = parameters->options().soname(); |
fced7afd ILT |
4242 | if (soname != NULL) |
4243 | odyn->add_string(elfcpp::DT_SONAME, soname); | |
4244 | } | |
4245 | ||
c6585162 | 4246 | Symbol* sym = symtab->lookup(parameters->options().init()); |
14b31740 | 4247 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
4248 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
4249 | ||
c6585162 | 4250 | sym = symtab->lookup(parameters->options().fini()); |
14b31740 | 4251 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
4252 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
4253 | ||
f15f61a7 DK |
4254 | // Look for .init_array, .preinit_array and .fini_array by checking |
4255 | // section types. | |
4256 | for(Layout::Section_list::const_iterator p = this->section_list_.begin(); | |
4257 | p != this->section_list_.end(); | |
4258 | ++p) | |
4259 | switch((*p)->type()) | |
4260 | { | |
4261 | case elfcpp::SHT_FINI_ARRAY: | |
4262 | odyn->add_section_address(elfcpp::DT_FINI_ARRAY, *p); | |
4263 | odyn->add_section_size(elfcpp::DT_FINI_ARRAYSZ, *p); | |
4264 | break; | |
4265 | case elfcpp::SHT_INIT_ARRAY: | |
4266 | odyn->add_section_address(elfcpp::DT_INIT_ARRAY, *p); | |
4267 | odyn->add_section_size(elfcpp::DT_INIT_ARRAYSZ, *p); | |
4268 | break; | |
4269 | case elfcpp::SHT_PREINIT_ARRAY: | |
4270 | odyn->add_section_address(elfcpp::DT_PREINIT_ARRAY, *p); | |
4271 | odyn->add_section_size(elfcpp::DT_PREINIT_ARRAYSZ, *p); | |
4272 | break; | |
4273 | default: | |
4274 | break; | |
4275 | } | |
4276 | ||
41f542e7 | 4277 | // Add a DT_RPATH entry if needed. |
e55bde5e | 4278 | const General_options::Dir_list& rpath(parameters->options().rpath()); |
41f542e7 ILT |
4279 | if (!rpath.empty()) |
4280 | { | |
4281 | std::string rpath_val; | |
4282 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
4283 | p != rpath.end(); | |
4284 | ++p) | |
4285 | { | |
4286 | if (rpath_val.empty()) | |
ad2d6943 | 4287 | rpath_val = p->name(); |
41f542e7 ILT |
4288 | else |
4289 | { | |
4290 | // Eliminate duplicates. | |
4291 | General_options::Dir_list::const_iterator q; | |
4292 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 4293 | if (q->name() == p->name()) |
41f542e7 ILT |
4294 | break; |
4295 | if (q == p) | |
4296 | { | |
4297 | rpath_val += ':'; | |
ad2d6943 | 4298 | rpath_val += p->name(); |
41f542e7 ILT |
4299 | } |
4300 | } | |
4301 | } | |
4302 | ||
4303 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
7c414435 DM |
4304 | if (parameters->options().enable_new_dtags()) |
4305 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); | |
41f542e7 | 4306 | } |
4f4c5f80 ILT |
4307 | |
4308 | // Look for text segments that have dynamic relocations. | |
4309 | bool have_textrel = false; | |
4e8fe71f | 4310 | if (!this->script_options_->saw_sections_clause()) |
4f4c5f80 | 4311 | { |
4e8fe71f ILT |
4312 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
4313 | p != this->segment_list_.end(); | |
4314 | ++p) | |
4315 | { | |
766f91bb ILT |
4316 | if ((*p)->type() == elfcpp::PT_LOAD |
4317 | && ((*p)->flags() & elfcpp::PF_W) == 0 | |
22f0da72 | 4318 | && (*p)->has_dynamic_reloc()) |
4e8fe71f ILT |
4319 | { |
4320 | have_textrel = true; | |
4321 | break; | |
4322 | } | |
4323 | } | |
4324 | } | |
4325 | else | |
4326 | { | |
4327 | // We don't know the section -> segment mapping, so we are | |
4328 | // conservative and just look for readonly sections with | |
4329 | // relocations. If those sections wind up in writable segments, | |
4330 | // then we have created an unnecessary DT_TEXTREL entry. | |
4331 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
4332 | p != this->section_list_.end(); | |
4333 | ++p) | |
4334 | { | |
4335 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 | |
4336 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 | |
766f91bb | 4337 | && (*p)->has_dynamic_reloc()) |
4e8fe71f ILT |
4338 | { |
4339 | have_textrel = true; | |
4340 | break; | |
4341 | } | |
4342 | } | |
4f4c5f80 ILT |
4343 | } |
4344 | ||
886288f1 ILT |
4345 | if (parameters->options().filter() != NULL) |
4346 | odyn->add_string(elfcpp::DT_FILTER, parameters->options().filter()); | |
4347 | if (parameters->options().any_auxiliary()) | |
4348 | { | |
4349 | for (options::String_set::const_iterator p = | |
4350 | parameters->options().auxiliary_begin(); | |
4351 | p != parameters->options().auxiliary_end(); | |
4352 | ++p) | |
4353 | odyn->add_string(elfcpp::DT_AUXILIARY, *p); | |
4354 | } | |
4355 | ||
4356 | // Add a DT_FLAGS entry if necessary. | |
4f4c5f80 ILT |
4357 | unsigned int flags = 0; |
4358 | if (have_textrel) | |
6a41d30b ILT |
4359 | { |
4360 | // Add a DT_TEXTREL for compatibility with older loaders. | |
4361 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
4362 | flags |= elfcpp::DF_TEXTREL; | |
b9674e17 | 4363 | |
ffeef7df ILT |
4364 | if (parameters->options().text()) |
4365 | gold_error(_("read-only segment has dynamic relocations")); | |
4366 | else if (parameters->options().warn_shared_textrel() | |
4367 | && parameters->options().shared()) | |
b9674e17 | 4368 | gold_warning(_("shared library text segment is not shareable")); |
6a41d30b | 4369 | } |
8851ecca | 4370 | if (parameters->options().shared() && this->has_static_tls()) |
535890bb | 4371 | flags |= elfcpp::DF_STATIC_TLS; |
7be8330a CD |
4372 | if (parameters->options().origin()) |
4373 | flags |= elfcpp::DF_ORIGIN; | |
f15f61a7 DK |
4374 | if (parameters->options().Bsymbolic()) |
4375 | { | |
4376 | flags |= elfcpp::DF_SYMBOLIC; | |
4377 | // Add DT_SYMBOLIC for compatibility with older loaders. | |
4378 | odyn->add_constant(elfcpp::DT_SYMBOLIC, 0); | |
4379 | } | |
e1c74d60 ILT |
4380 | if (parameters->options().now()) |
4381 | flags |= elfcpp::DF_BIND_NOW; | |
0d212c3a ILT |
4382 | if (flags != 0) |
4383 | odyn->add_constant(elfcpp::DT_FLAGS, flags); | |
7c414435 DM |
4384 | |
4385 | flags = 0; | |
4386 | if (parameters->options().initfirst()) | |
4387 | flags |= elfcpp::DF_1_INITFIRST; | |
4388 | if (parameters->options().interpose()) | |
4389 | flags |= elfcpp::DF_1_INTERPOSE; | |
4390 | if (parameters->options().loadfltr()) | |
4391 | flags |= elfcpp::DF_1_LOADFLTR; | |
4392 | if (parameters->options().nodefaultlib()) | |
4393 | flags |= elfcpp::DF_1_NODEFLIB; | |
4394 | if (parameters->options().nodelete()) | |
4395 | flags |= elfcpp::DF_1_NODELETE; | |
4396 | if (parameters->options().nodlopen()) | |
4397 | flags |= elfcpp::DF_1_NOOPEN; | |
4398 | if (parameters->options().nodump()) | |
4399 | flags |= elfcpp::DF_1_NODUMP; | |
4400 | if (!parameters->options().shared()) | |
4401 | flags &= ~(elfcpp::DF_1_INITFIRST | |
4402 | | elfcpp::DF_1_NODELETE | |
4403 | | elfcpp::DF_1_NOOPEN); | |
7be8330a CD |
4404 | if (parameters->options().origin()) |
4405 | flags |= elfcpp::DF_1_ORIGIN; | |
e1c74d60 ILT |
4406 | if (parameters->options().now()) |
4407 | flags |= elfcpp::DF_1_NOW; | |
e2153196 ILT |
4408 | if (parameters->options().Bgroup()) |
4409 | flags |= elfcpp::DF_1_GROUP; | |
0d212c3a | 4410 | if (flags != 0) |
7c414435 | 4411 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); |
a3ad94ed ILT |
4412 | } |
4413 | ||
f0ba79e2 ILT |
4414 | // Set the size of the _DYNAMIC symbol table to be the size of the |
4415 | // dynamic data. | |
4416 | ||
4417 | void | |
4418 | Layout::set_dynamic_symbol_size(const Symbol_table* symtab) | |
4419 | { | |
4420 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
6daf5215 ILT |
4421 | if (odyn == NULL) |
4422 | return; | |
f0ba79e2 | 4423 | odyn->finalize_data_size(); |
6daf5215 ILT |
4424 | if (this->dynamic_symbol_ == NULL) |
4425 | return; | |
f0ba79e2 ILT |
4426 | off_t data_size = odyn->data_size(); |
4427 | const int size = parameters->target().get_size(); | |
4428 | if (size == 32) | |
4429 | symtab->get_sized_symbol<32>(this->dynamic_symbol_)->set_symsize(data_size); | |
4430 | else if (size == 64) | |
4431 | symtab->get_sized_symbol<64>(this->dynamic_symbol_)->set_symsize(data_size); | |
4432 | else | |
4433 | gold_unreachable(); | |
4434 | } | |
4435 | ||
dff16297 ILT |
4436 | // The mapping of input section name prefixes to output section names. |
4437 | // In some cases one prefix is itself a prefix of another prefix; in | |
4438 | // such a case the longer prefix must come first. These prefixes are | |
4439 | // based on the GNU linker default ELF linker script. | |
a2fb1b05 | 4440 | |
ead1e424 | 4441 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
dff16297 | 4442 | const Layout::Section_name_mapping Layout::section_name_mapping[] = |
a2fb1b05 | 4443 | { |
dff16297 | 4444 | MAPPING_INIT(".text.", ".text"), |
dff16297 ILT |
4445 | MAPPING_INIT(".rodata.", ".rodata"), |
4446 | MAPPING_INIT(".data.rel.ro.local", ".data.rel.ro.local"), | |
4447 | MAPPING_INIT(".data.rel.ro", ".data.rel.ro"), | |
4448 | MAPPING_INIT(".data.", ".data"), | |
4449 | MAPPING_INIT(".bss.", ".bss"), | |
4450 | MAPPING_INIT(".tdata.", ".tdata"), | |
4451 | MAPPING_INIT(".tbss.", ".tbss"), | |
4452 | MAPPING_INIT(".init_array.", ".init_array"), | |
4453 | MAPPING_INIT(".fini_array.", ".fini_array"), | |
4454 | MAPPING_INIT(".sdata.", ".sdata"), | |
4455 | MAPPING_INIT(".sbss.", ".sbss"), | |
4456 | // FIXME: In the GNU linker, .sbss2 and .sdata2 are handled | |
4457 | // differently depending on whether it is creating a shared library. | |
4458 | MAPPING_INIT(".sdata2.", ".sdata"), | |
4459 | MAPPING_INIT(".sbss2.", ".sbss"), | |
4460 | MAPPING_INIT(".lrodata.", ".lrodata"), | |
4461 | MAPPING_INIT(".ldata.", ".ldata"), | |
4462 | MAPPING_INIT(".lbss.", ".lbss"), | |
4463 | MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"), | |
4464 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"), | |
4465 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"), | |
4466 | MAPPING_INIT(".gnu.linkonce.t.", ".text"), | |
4467 | MAPPING_INIT(".gnu.linkonce.r.", ".rodata"), | |
4468 | MAPPING_INIT(".gnu.linkonce.d.", ".data"), | |
4469 | MAPPING_INIT(".gnu.linkonce.b.", ".bss"), | |
4470 | MAPPING_INIT(".gnu.linkonce.s.", ".sdata"), | |
4471 | MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"), | |
4472 | MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"), | |
4473 | MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"), | |
4474 | MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"), | |
4475 | MAPPING_INIT(".gnu.linkonce.td.", ".tdata"), | |
4476 | MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"), | |
4477 | MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"), | |
4478 | MAPPING_INIT(".gnu.linkonce.l.", ".ldata"), | |
4479 | MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"), | |
4a54abbb | 4480 | MAPPING_INIT(".ARM.extab", ".ARM.extab"), |
1dcd334d | 4481 | MAPPING_INIT(".gnu.linkonce.armextab.", ".ARM.extab"), |
4a54abbb | 4482 | MAPPING_INIT(".ARM.exidx", ".ARM.exidx"), |
1dcd334d | 4483 | MAPPING_INIT(".gnu.linkonce.armexidx.", ".ARM.exidx"), |
a2fb1b05 ILT |
4484 | }; |
4485 | #undef MAPPING_INIT | |
4486 | ||
dff16297 ILT |
4487 | const int Layout::section_name_mapping_count = |
4488 | (sizeof(Layout::section_name_mapping) | |
4489 | / sizeof(Layout::section_name_mapping[0])); | |
a2fb1b05 | 4490 | |
ead1e424 ILT |
4491 | // Choose the output section name to use given an input section name. |
4492 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
4493 | // length of NAME. | |
4494 | ||
4495 | const char* | |
5393d741 ILT |
4496 | Layout::output_section_name(const Relobj* relobj, const char* name, |
4497 | size_t* plen) | |
ead1e424 | 4498 | { |
af4a8a83 ILT |
4499 | // gcc 4.3 generates the following sorts of section names when it |
4500 | // needs a section name specific to a function: | |
4501 | // .text.FN | |
4502 | // .rodata.FN | |
4503 | // .sdata2.FN | |
4504 | // .data.FN | |
4505 | // .data.rel.FN | |
4506 | // .data.rel.local.FN | |
4507 | // .data.rel.ro.FN | |
4508 | // .data.rel.ro.local.FN | |
4509 | // .sdata.FN | |
4510 | // .bss.FN | |
4511 | // .sbss.FN | |
4512 | // .tdata.FN | |
4513 | // .tbss.FN | |
4514 | ||
4515 | // The GNU linker maps all of those to the part before the .FN, | |
4516 | // except that .data.rel.local.FN is mapped to .data, and | |
4517 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
4518 | // beginning with .data.rel.ro.local are grouped together. | |
4519 | ||
4520 | // For an anonymous namespace, the string FN can contain a '.'. | |
4521 | ||
4522 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
4523 | // GNU linker maps to .rodata. | |
4524 | ||
dff16297 ILT |
4525 | // The .data.rel.ro sections are used with -z relro. The sections |
4526 | // are recognized by name. We use the same names that the GNU | |
4527 | // linker does for these sections. | |
af4a8a83 | 4528 | |
dff16297 ILT |
4529 | // It is hard to handle this in a principled way, so we don't even |
4530 | // try. We use a table of mappings. If the input section name is | |
4531 | // not found in the table, we simply use it as the output section | |
4532 | // name. | |
af4a8a83 | 4533 | |
dff16297 ILT |
4534 | const Section_name_mapping* psnm = section_name_mapping; |
4535 | for (int i = 0; i < section_name_mapping_count; ++i, ++psnm) | |
ead1e424 | 4536 | { |
dff16297 ILT |
4537 | if (strncmp(name, psnm->from, psnm->fromlen) == 0) |
4538 | { | |
4539 | *plen = psnm->tolen; | |
4540 | return psnm->to; | |
4541 | } | |
ead1e424 ILT |
4542 | } |
4543 | ||
5393d741 ILT |
4544 | // As an additional complication, .ctors sections are output in |
4545 | // either .ctors or .init_array sections, and .dtors sections are | |
4546 | // output in either .dtors or .fini_array sections. | |
4547 | if (is_prefix_of(".ctors.", name) || is_prefix_of(".dtors.", name)) | |
4548 | { | |
4549 | if (parameters->options().ctors_in_init_array()) | |
4550 | { | |
4551 | *plen = 11; | |
4552 | return name[1] == 'c' ? ".init_array" : ".fini_array"; | |
4553 | } | |
4554 | else | |
4555 | { | |
4556 | *plen = 6; | |
4557 | return name[1] == 'c' ? ".ctors" : ".dtors"; | |
4558 | } | |
4559 | } | |
4560 | if (parameters->options().ctors_in_init_array() | |
4561 | && (strcmp(name, ".ctors") == 0 || strcmp(name, ".dtors") == 0)) | |
4562 | { | |
4563 | // To make .init_array/.fini_array work with gcc we must exclude | |
4564 | // .ctors and .dtors sections from the crtbegin and crtend | |
4565 | // files. | |
4566 | if (relobj == NULL | |
4567 | || (!Layout::match_file_name(relobj, "crtbegin") | |
4568 | && !Layout::match_file_name(relobj, "crtend"))) | |
4569 | { | |
4570 | *plen = 11; | |
4571 | return name[1] == 'c' ? ".init_array" : ".fini_array"; | |
4572 | } | |
4573 | } | |
4574 | ||
ead1e424 ILT |
4575 | return name; |
4576 | } | |
4577 | ||
5393d741 ILT |
4578 | // Return true if RELOBJ is an input file whose base name matches |
4579 | // FILE_NAME. The base name must have an extension of ".o", and must | |
4580 | // be exactly FILE_NAME.o or FILE_NAME, one character, ".o". This is | |
4581 | // to match crtbegin.o as well as crtbeginS.o without getting confused | |
4582 | // by other possibilities. Overall matching the file name this way is | |
4583 | // a dreadful hack, but the GNU linker does it in order to better | |
4584 | // support gcc, and we need to be compatible. | |
4585 | ||
4586 | bool | |
4587 | Layout::match_file_name(const Relobj* relobj, const char* match) | |
4588 | { | |
4589 | const std::string& file_name(relobj->name()); | |
4590 | const char* base_name = lbasename(file_name.c_str()); | |
4591 | size_t match_len = strlen(match); | |
4592 | if (strncmp(base_name, match, match_len) != 0) | |
4593 | return false; | |
4594 | size_t base_len = strlen(base_name); | |
4595 | if (base_len != match_len + 2 && base_len != match_len + 3) | |
4596 | return false; | |
4597 | return memcmp(base_name + base_len - 2, ".o", 2) == 0; | |
4598 | } | |
4599 | ||
8a4c0b0d ILT |
4600 | // Check if a comdat group or .gnu.linkonce section with the given |
4601 | // NAME is selected for the link. If there is already a section, | |
1ef4d87f ILT |
4602 | // *KEPT_SECTION is set to point to the existing section and the |
4603 | // function returns false. Otherwise, OBJECT, SHNDX, IS_COMDAT, and | |
4604 | // IS_GROUP_NAME are recorded for this NAME in the layout object, | |
4605 | // *KEPT_SECTION is set to the internal copy and the function returns | |
4606 | // true. | |
a2fb1b05 ILT |
4607 | |
4608 | bool | |
e55bde5e | 4609 | Layout::find_or_add_kept_section(const std::string& name, |
1ef4d87f ILT |
4610 | Relobj* object, |
4611 | unsigned int shndx, | |
4612 | bool is_comdat, | |
4613 | bool is_group_name, | |
8a4c0b0d | 4614 | Kept_section** kept_section) |
a2fb1b05 | 4615 | { |
e55bde5e ILT |
4616 | // It's normal to see a couple of entries here, for the x86 thunk |
4617 | // sections. If we see more than a few, we're linking a C++ | |
4618 | // program, and we resize to get more space to minimize rehashing. | |
4619 | if (this->signatures_.size() > 4 | |
4620 | && !this->resized_signatures_) | |
4621 | { | |
4622 | reserve_unordered_map(&this->signatures_, | |
4623 | this->number_of_input_files_ * 64); | |
4624 | this->resized_signatures_ = true; | |
4625 | } | |
4626 | ||
1ef4d87f ILT |
4627 | Kept_section candidate; |
4628 | std::pair<Signatures::iterator, bool> ins = | |
4629 | this->signatures_.insert(std::make_pair(name, candidate)); | |
a2fb1b05 | 4630 | |
1ef4d87f | 4631 | if (kept_section != NULL) |
8a4c0b0d | 4632 | *kept_section = &ins.first->second; |
a2fb1b05 ILT |
4633 | if (ins.second) |
4634 | { | |
4635 | // This is the first time we've seen this signature. | |
1ef4d87f ILT |
4636 | ins.first->second.set_object(object); |
4637 | ins.first->second.set_shndx(shndx); | |
4638 | if (is_comdat) | |
4639 | ins.first->second.set_is_comdat(); | |
4640 | if (is_group_name) | |
4641 | ins.first->second.set_is_group_name(); | |
a2fb1b05 ILT |
4642 | return true; |
4643 | } | |
4644 | ||
1ef4d87f ILT |
4645 | // We have already seen this signature. |
4646 | ||
4647 | if (ins.first->second.is_group_name()) | |
a2fb1b05 ILT |
4648 | { |
4649 | // We've already seen a real section group with this signature. | |
1ef4d87f ILT |
4650 | // If the kept group is from a plugin object, and we're in the |
4651 | // replacement phase, accept the new one as a replacement. | |
4652 | if (ins.first->second.object() == NULL | |
2756a258 CC |
4653 | && parameters->options().plugins()->in_replacement_phase()) |
4654 | { | |
1ef4d87f ILT |
4655 | ins.first->second.set_object(object); |
4656 | ins.first->second.set_shndx(shndx); | |
2756a258 CC |
4657 | return true; |
4658 | } | |
a2fb1b05 ILT |
4659 | return false; |
4660 | } | |
1ef4d87f | 4661 | else if (is_group_name) |
a2fb1b05 ILT |
4662 | { |
4663 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 4664 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 | 4665 | // a section group, and don't include this section group. |
1ef4d87f | 4666 | ins.first->second.set_is_group_name(); |
a2fb1b05 ILT |
4667 | return false; |
4668 | } | |
4669 | else | |
4670 | { | |
4671 | // We've already seen a linkonce section and this is a linkonce | |
4672 | // section. These don't block each other--this may be the same | |
4673 | // symbol name with different section types. | |
4674 | return true; | |
4675 | } | |
4676 | } | |
4677 | ||
a445fddf ILT |
4678 | // Store the allocated sections into the section list. |
4679 | ||
4680 | void | |
2ea97941 | 4681 | Layout::get_allocated_sections(Section_list* section_list) const |
a445fddf ILT |
4682 | { |
4683 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
4684 | p != this->section_list_.end(); | |
4685 | ++p) | |
4686 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) | |
2ea97941 | 4687 | section_list->push_back(*p); |
a445fddf ILT |
4688 | } |
4689 | ||
4690 | // Create an output segment. | |
4691 | ||
4692 | Output_segment* | |
4693 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
4694 | { | |
8851ecca | 4695 | gold_assert(!parameters->options().relocatable()); |
a445fddf ILT |
4696 | Output_segment* oseg = new Output_segment(type, flags); |
4697 | this->segment_list_.push_back(oseg); | |
2d924fd9 ILT |
4698 | |
4699 | if (type == elfcpp::PT_TLS) | |
4700 | this->tls_segment_ = oseg; | |
4701 | else if (type == elfcpp::PT_GNU_RELRO) | |
4702 | this->relro_segment_ = oseg; | |
10b4f102 ILT |
4703 | else if (type == elfcpp::PT_INTERP) |
4704 | this->interp_segment_ = oseg; | |
2d924fd9 | 4705 | |
a445fddf ILT |
4706 | return oseg; |
4707 | } | |
4708 | ||
bec5b579 CC |
4709 | // Return the file offset of the normal symbol table. |
4710 | ||
4711 | off_t | |
4712 | Layout::symtab_section_offset() const | |
4713 | { | |
4714 | if (this->symtab_section_ != NULL) | |
4715 | return this->symtab_section_->offset(); | |
4716 | return 0; | |
4717 | } | |
4718 | ||
886f533a ILT |
4719 | // Return the section index of the normal symbol table. It may have |
4720 | // been stripped by the -s/--strip-all option. | |
4721 | ||
4722 | unsigned int | |
4723 | Layout::symtab_section_shndx() const | |
4724 | { | |
4725 | if (this->symtab_section_ != NULL) | |
4726 | return this->symtab_section_->out_shndx(); | |
4727 | return 0; | |
4728 | } | |
4729 | ||
730cdc88 ILT |
4730 | // Write out the Output_sections. Most won't have anything to write, |
4731 | // since most of the data will come from input sections which are | |
4732 | // handled elsewhere. But some Output_sections do have Output_data. | |
4733 | ||
4734 | void | |
4735 | Layout::write_output_sections(Output_file* of) const | |
4736 | { | |
4737 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
4738 | p != this->section_list_.end(); | |
4739 | ++p) | |
4740 | { | |
4741 | if (!(*p)->after_input_sections()) | |
4742 | (*p)->write(of); | |
4743 | } | |
4744 | } | |
4745 | ||
61ba1cf9 ILT |
4746 | // Write out data not associated with a section or the symbol table. |
4747 | ||
4748 | void | |
9025d29d | 4749 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 4750 | { |
8851ecca | 4751 | if (!parameters->options().strip_all()) |
a3ad94ed | 4752 | { |
2ea97941 | 4753 | const Output_section* symtab_section = this->symtab_section_; |
9e2dcb77 ILT |
4754 | for (Section_list::const_iterator p = this->section_list_.begin(); |
4755 | p != this->section_list_.end(); | |
4756 | ++p) | |
a3ad94ed | 4757 | { |
9e2dcb77 ILT |
4758 | if ((*p)->needs_symtab_index()) |
4759 | { | |
2ea97941 | 4760 | gold_assert(symtab_section != NULL); |
9e2dcb77 ILT |
4761 | unsigned int index = (*p)->symtab_index(); |
4762 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
4763 | off_t off = (symtab_section->offset() |
4764 | + index * symtab_section->entsize()); | |
d491d34e | 4765 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
9e2dcb77 | 4766 | } |
a3ad94ed ILT |
4767 | } |
4768 | } | |
4769 | ||
2ea97941 | 4770 | const Output_section* dynsym_section = this->dynsym_section_; |
a3ad94ed ILT |
4771 | for (Section_list::const_iterator p = this->section_list_.begin(); |
4772 | p != this->section_list_.end(); | |
4773 | ++p) | |
4774 | { | |
4775 | if ((*p)->needs_dynsym_index()) | |
4776 | { | |
2ea97941 | 4777 | gold_assert(dynsym_section != NULL); |
a3ad94ed ILT |
4778 | unsigned int index = (*p)->dynsym_index(); |
4779 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
4780 | off_t off = (dynsym_section->offset() |
4781 | + index * dynsym_section->entsize()); | |
d491d34e | 4782 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
a3ad94ed ILT |
4783 | } |
4784 | } | |
4785 | ||
a3ad94ed | 4786 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
4787 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
4788 | p != this->special_output_list_.end(); | |
4789 | ++p) | |
4790 | (*p)->write(of); | |
4791 | } | |
4792 | ||
730cdc88 ILT |
4793 | // Write out the Output_sections which can only be written after the |
4794 | // input sections are complete. | |
4795 | ||
4796 | void | |
27bc2bce | 4797 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 4798 | { |
27bc2bce | 4799 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
4800 | // file size. Note we finalize the .shstrab last, to allow the |
4801 | // after_input_section sections to modify their section-names before | |
4802 | // writing. | |
17a1d0a9 | 4803 | if (this->any_postprocessing_sections_) |
27bc2bce | 4804 | { |
17a1d0a9 ILT |
4805 | off_t off = this->output_file_size_; |
4806 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); | |
8a4c0b0d | 4807 | |
17a1d0a9 ILT |
4808 | // Now that we've finalized the names, we can finalize the shstrab. |
4809 | off = | |
4810 | this->set_section_offsets(off, | |
4811 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
4812 | ||
4813 | if (off > this->output_file_size_) | |
4814 | { | |
4815 | of->resize(off); | |
4816 | this->output_file_size_ = off; | |
4817 | } | |
27bc2bce ILT |
4818 | } |
4819 | ||
730cdc88 ILT |
4820 | for (Section_list::const_iterator p = this->section_list_.begin(); |
4821 | p != this->section_list_.end(); | |
4822 | ++p) | |
4823 | { | |
4824 | if ((*p)->after_input_sections()) | |
4825 | (*p)->write(of); | |
4826 | } | |
27bc2bce | 4827 | |
27bc2bce | 4828 | this->section_headers_->write(of); |
730cdc88 ILT |
4829 | } |
4830 | ||
8ed814a9 ILT |
4831 | // If the build ID requires computing a checksum, do so here, and |
4832 | // write it out. We compute a checksum over the entire file because | |
4833 | // that is simplest. | |
4834 | ||
4835 | void | |
4836 | Layout::write_build_id(Output_file* of) const | |
4837 | { | |
4838 | if (this->build_id_note_ == NULL) | |
4839 | return; | |
4840 | ||
4841 | const unsigned char* iv = of->get_input_view(0, this->output_file_size_); | |
4842 | ||
4843 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), | |
4844 | this->build_id_note_->data_size()); | |
4845 | ||
4846 | const char* style = parameters->options().build_id(); | |
4847 | if (strcmp(style, "sha1") == 0) | |
4848 | { | |
4849 | sha1_ctx ctx; | |
4850 | sha1_init_ctx(&ctx); | |
4851 | sha1_process_bytes(iv, this->output_file_size_, &ctx); | |
4852 | sha1_finish_ctx(&ctx, ov); | |
4853 | } | |
4854 | else if (strcmp(style, "md5") == 0) | |
4855 | { | |
4856 | md5_ctx ctx; | |
4857 | md5_init_ctx(&ctx); | |
4858 | md5_process_bytes(iv, this->output_file_size_, &ctx); | |
4859 | md5_finish_ctx(&ctx, ov); | |
4860 | } | |
4861 | else | |
4862 | gold_unreachable(); | |
4863 | ||
4864 | of->write_output_view(this->build_id_note_->offset(), | |
4865 | this->build_id_note_->data_size(), | |
4866 | ov); | |
4867 | ||
4868 | of->free_input_view(0, this->output_file_size_, iv); | |
4869 | } | |
4870 | ||
516cb3d0 ILT |
4871 | // Write out a binary file. This is called after the link is |
4872 | // complete. IN is the temporary output file we used to generate the | |
4873 | // ELF code. We simply walk through the segments, read them from | |
4874 | // their file offset in IN, and write them to their load address in | |
4875 | // the output file. FIXME: with a bit more work, we could support | |
4876 | // S-records and/or Intel hex format here. | |
4877 | ||
4878 | void | |
4879 | Layout::write_binary(Output_file* in) const | |
4880 | { | |
e55bde5e | 4881 | gold_assert(parameters->options().oformat_enum() |
bc644c6c | 4882 | == General_options::OBJECT_FORMAT_BINARY); |
516cb3d0 ILT |
4883 | |
4884 | // Get the size of the binary file. | |
4885 | uint64_t max_load_address = 0; | |
4886 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4887 | p != this->segment_list_.end(); | |
4888 | ++p) | |
4889 | { | |
4890 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
4891 | { | |
4892 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); | |
4893 | if (max_paddr > max_load_address) | |
4894 | max_load_address = max_paddr; | |
4895 | } | |
4896 | } | |
4897 | ||
8851ecca | 4898 | Output_file out(parameters->options().output_file_name()); |
516cb3d0 ILT |
4899 | out.open(max_load_address); |
4900 | ||
4901 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4902 | p != this->segment_list_.end(); | |
4903 | ++p) | |
4904 | { | |
4905 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
4906 | { | |
4907 | const unsigned char* vin = in->get_input_view((*p)->offset(), | |
4908 | (*p)->filesz()); | |
4909 | unsigned char* vout = out.get_output_view((*p)->paddr(), | |
4910 | (*p)->filesz()); | |
4911 | memcpy(vout, vin, (*p)->filesz()); | |
4912 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); | |
4913 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); | |
4914 | } | |
4915 | } | |
4916 | ||
4917 | out.close(); | |
4918 | } | |
4919 | ||
7d9e3d98 ILT |
4920 | // Print the output sections to the map file. |
4921 | ||
4922 | void | |
4923 | Layout::print_to_mapfile(Mapfile* mapfile) const | |
4924 | { | |
4925 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4926 | p != this->segment_list_.end(); | |
4927 | ++p) | |
4928 | (*p)->print_sections_to_mapfile(mapfile); | |
4929 | } | |
4930 | ||
ad8f37d1 ILT |
4931 | // Print statistical information to stderr. This is used for --stats. |
4932 | ||
4933 | void | |
4934 | Layout::print_stats() const | |
4935 | { | |
4936 | this->namepool_.print_stats("section name pool"); | |
4937 | this->sympool_.print_stats("output symbol name pool"); | |
4938 | this->dynpool_.print_stats("dynamic name pool"); | |
38c5e8b4 ILT |
4939 | |
4940 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
4941 | p != this->section_list_.end(); | |
4942 | ++p) | |
4943 | (*p)->print_merge_stats(); | |
ad8f37d1 ILT |
4944 | } |
4945 | ||
730cdc88 ILT |
4946 | // Write_sections_task methods. |
4947 | ||
4948 | // We can always run this task. | |
4949 | ||
17a1d0a9 ILT |
4950 | Task_token* |
4951 | Write_sections_task::is_runnable() | |
730cdc88 | 4952 | { |
17a1d0a9 | 4953 | return NULL; |
730cdc88 ILT |
4954 | } |
4955 | ||
4956 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
4957 | // when finished. | |
4958 | ||
17a1d0a9 ILT |
4959 | void |
4960 | Write_sections_task::locks(Task_locker* tl) | |
730cdc88 | 4961 | { |
17a1d0a9 ILT |
4962 | tl->add(this, this->output_sections_blocker_); |
4963 | tl->add(this, this->final_blocker_); | |
730cdc88 ILT |
4964 | } |
4965 | ||
4966 | // Run the task--write out the data. | |
4967 | ||
4968 | void | |
4969 | Write_sections_task::run(Workqueue*) | |
4970 | { | |
4971 | this->layout_->write_output_sections(this->of_); | |
4972 | } | |
4973 | ||
61ba1cf9 ILT |
4974 | // Write_data_task methods. |
4975 | ||
4976 | // We can always run this task. | |
4977 | ||
17a1d0a9 ILT |
4978 | Task_token* |
4979 | Write_data_task::is_runnable() | |
61ba1cf9 | 4980 | { |
17a1d0a9 | 4981 | return NULL; |
61ba1cf9 ILT |
4982 | } |
4983 | ||
4984 | // We need to unlock FINAL_BLOCKER when finished. | |
4985 | ||
17a1d0a9 ILT |
4986 | void |
4987 | Write_data_task::locks(Task_locker* tl) | |
61ba1cf9 | 4988 | { |
17a1d0a9 | 4989 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
4990 | } |
4991 | ||
4992 | // Run the task--write out the data. | |
4993 | ||
4994 | void | |
4995 | Write_data_task::run(Workqueue*) | |
4996 | { | |
9025d29d | 4997 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
4998 | } |
4999 | ||
5000 | // Write_symbols_task methods. | |
5001 | ||
5002 | // We can always run this task. | |
5003 | ||
17a1d0a9 ILT |
5004 | Task_token* |
5005 | Write_symbols_task::is_runnable() | |
61ba1cf9 | 5006 | { |
17a1d0a9 | 5007 | return NULL; |
61ba1cf9 ILT |
5008 | } |
5009 | ||
5010 | // We need to unlock FINAL_BLOCKER when finished. | |
5011 | ||
17a1d0a9 ILT |
5012 | void |
5013 | Write_symbols_task::locks(Task_locker* tl) | |
61ba1cf9 | 5014 | { |
17a1d0a9 | 5015 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
5016 | } |
5017 | ||
5018 | // Run the task--write out the symbols. | |
5019 | ||
5020 | void | |
5021 | Write_symbols_task::run(Workqueue*) | |
5022 | { | |
fd9d194f ILT |
5023 | this->symtab_->write_globals(this->sympool_, this->dynpool_, |
5024 | this->layout_->symtab_xindex(), | |
d491d34e | 5025 | this->layout_->dynsym_xindex(), this->of_); |
61ba1cf9 ILT |
5026 | } |
5027 | ||
730cdc88 ILT |
5028 | // Write_after_input_sections_task methods. |
5029 | ||
5030 | // We can only run this task after the input sections have completed. | |
5031 | ||
17a1d0a9 ILT |
5032 | Task_token* |
5033 | Write_after_input_sections_task::is_runnable() | |
730cdc88 ILT |
5034 | { |
5035 | if (this->input_sections_blocker_->is_blocked()) | |
17a1d0a9 ILT |
5036 | return this->input_sections_blocker_; |
5037 | return NULL; | |
730cdc88 ILT |
5038 | } |
5039 | ||
5040 | // We need to unlock FINAL_BLOCKER when finished. | |
5041 | ||
17a1d0a9 ILT |
5042 | void |
5043 | Write_after_input_sections_task::locks(Task_locker* tl) | |
730cdc88 | 5044 | { |
17a1d0a9 | 5045 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
5046 | } |
5047 | ||
5048 | // Run the task. | |
5049 | ||
5050 | void | |
5051 | Write_after_input_sections_task::run(Workqueue*) | |
5052 | { | |
5053 | this->layout_->write_sections_after_input_sections(this->of_); | |
5054 | } | |
5055 | ||
92e059d8 | 5056 | // Close_task_runner methods. |
61ba1cf9 ILT |
5057 | |
5058 | // Run the task--close the file. | |
5059 | ||
5060 | void | |
17a1d0a9 | 5061 | Close_task_runner::run(Workqueue*, const Task*) |
61ba1cf9 | 5062 | { |
8ed814a9 ILT |
5063 | // If we need to compute a checksum for the BUILD if, we do so here. |
5064 | this->layout_->write_build_id(this->of_); | |
5065 | ||
516cb3d0 | 5066 | // If we've been asked to create a binary file, we do so here. |
7cc619c3 | 5067 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
5068 | this->layout_->write_binary(this->of_); |
5069 | ||
61ba1cf9 ILT |
5070 | this->of_->close(); |
5071 | } | |
5072 | ||
a2fb1b05 ILT |
5073 | // Instantiate the templates we need. We could use the configure |
5074 | // script to restrict this to only the ones for implemented targets. | |
5075 | ||
193a53d9 | 5076 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 | 5077 | template |
cdc29364 CC |
5078 | Output_section* |
5079 | Layout::init_fixed_output_section<32, false>( | |
5080 | const char* name, | |
5081 | elfcpp::Shdr<32, false>& shdr); | |
5082 | #endif | |
5083 | ||
5084 | #ifdef HAVE_TARGET_32_BIG | |
5085 | template | |
5086 | Output_section* | |
5087 | Layout::init_fixed_output_section<32, true>( | |
5088 | const char* name, | |
5089 | elfcpp::Shdr<32, true>& shdr); | |
5090 | #endif | |
5091 | ||
5092 | #ifdef HAVE_TARGET_64_LITTLE | |
5093 | template | |
5094 | Output_section* | |
5095 | Layout::init_fixed_output_section<64, false>( | |
5096 | const char* name, | |
5097 | elfcpp::Shdr<64, false>& shdr); | |
5098 | #endif | |
5099 | ||
5100 | #ifdef HAVE_TARGET_64_BIG | |
5101 | template | |
5102 | Output_section* | |
5103 | Layout::init_fixed_output_section<64, true>( | |
5104 | const char* name, | |
5105 | elfcpp::Shdr<64, true>& shdr); | |
5106 | #endif | |
5107 | ||
5108 | #ifdef HAVE_TARGET_32_LITTLE | |
5109 | template | |
a2fb1b05 | 5110 | Output_section* |
6fa2a40b CC |
5111 | Layout::layout<32, false>(Sized_relobj_file<32, false>* object, |
5112 | unsigned int shndx, | |
730cdc88 ILT |
5113 | const char* name, |
5114 | const elfcpp::Shdr<32, false>& shdr, | |
5115 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5116 | #endif |
a2fb1b05 | 5117 | |
193a53d9 | 5118 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
5119 | template |
5120 | Output_section* | |
6fa2a40b CC |
5121 | Layout::layout<32, true>(Sized_relobj_file<32, true>* object, |
5122 | unsigned int shndx, | |
730cdc88 ILT |
5123 | const char* name, |
5124 | const elfcpp::Shdr<32, true>& shdr, | |
5125 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5126 | #endif |
a2fb1b05 | 5127 | |
193a53d9 | 5128 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
5129 | template |
5130 | Output_section* | |
6fa2a40b CC |
5131 | Layout::layout<64, false>(Sized_relobj_file<64, false>* object, |
5132 | unsigned int shndx, | |
730cdc88 ILT |
5133 | const char* name, |
5134 | const elfcpp::Shdr<64, false>& shdr, | |
5135 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5136 | #endif |
a2fb1b05 | 5137 | |
193a53d9 | 5138 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
5139 | template |
5140 | Output_section* | |
6fa2a40b CC |
5141 | Layout::layout<64, true>(Sized_relobj_file<64, true>* object, |
5142 | unsigned int shndx, | |
730cdc88 ILT |
5143 | const char* name, |
5144 | const elfcpp::Shdr<64, true>& shdr, | |
5145 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 5146 | #endif |
a2fb1b05 | 5147 | |
6a74a719 ILT |
5148 | #ifdef HAVE_TARGET_32_LITTLE |
5149 | template | |
5150 | Output_section* | |
6fa2a40b | 5151 | Layout::layout_reloc<32, false>(Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
5152 | unsigned int reloc_shndx, |
5153 | const elfcpp::Shdr<32, false>& shdr, | |
5154 | Output_section* data_section, | |
5155 | Relocatable_relocs* rr); | |
5156 | #endif | |
5157 | ||
5158 | #ifdef HAVE_TARGET_32_BIG | |
5159 | template | |
5160 | Output_section* | |
6fa2a40b | 5161 | Layout::layout_reloc<32, true>(Sized_relobj_file<32, true>* object, |
6a74a719 ILT |
5162 | unsigned int reloc_shndx, |
5163 | const elfcpp::Shdr<32, true>& shdr, | |
5164 | Output_section* data_section, | |
5165 | Relocatable_relocs* rr); | |
5166 | #endif | |
5167 | ||
5168 | #ifdef HAVE_TARGET_64_LITTLE | |
5169 | template | |
5170 | Output_section* | |
6fa2a40b | 5171 | Layout::layout_reloc<64, false>(Sized_relobj_file<64, false>* object, |
6a74a719 ILT |
5172 | unsigned int reloc_shndx, |
5173 | const elfcpp::Shdr<64, false>& shdr, | |
5174 | Output_section* data_section, | |
5175 | Relocatable_relocs* rr); | |
5176 | #endif | |
5177 | ||
5178 | #ifdef HAVE_TARGET_64_BIG | |
5179 | template | |
5180 | Output_section* | |
6fa2a40b | 5181 | Layout::layout_reloc<64, true>(Sized_relobj_file<64, true>* object, |
6a74a719 ILT |
5182 | unsigned int reloc_shndx, |
5183 | const elfcpp::Shdr<64, true>& shdr, | |
5184 | Output_section* data_section, | |
5185 | Relocatable_relocs* rr); | |
5186 | #endif | |
5187 | ||
5188 | #ifdef HAVE_TARGET_32_LITTLE | |
5189 | template | |
5190 | void | |
5191 | Layout::layout_group<32, false>(Symbol_table* symtab, | |
6fa2a40b | 5192 | Sized_relobj_file<32, false>* object, |
6a74a719 ILT |
5193 | unsigned int, |
5194 | const char* group_section_name, | |
5195 | const char* signature, | |
5196 | const elfcpp::Shdr<32, false>& shdr, | |
8825ac63 ILT |
5197 | elfcpp::Elf_Word flags, |
5198 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5199 | #endif |
5200 | ||
5201 | #ifdef HAVE_TARGET_32_BIG | |
5202 | template | |
5203 | void | |
5204 | Layout::layout_group<32, true>(Symbol_table* symtab, | |
6fa2a40b | 5205 | Sized_relobj_file<32, true>* object, |
6a74a719 ILT |
5206 | unsigned int, |
5207 | const char* group_section_name, | |
5208 | const char* signature, | |
5209 | const elfcpp::Shdr<32, true>& shdr, | |
8825ac63 ILT |
5210 | elfcpp::Elf_Word flags, |
5211 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5212 | #endif |
5213 | ||
5214 | #ifdef HAVE_TARGET_64_LITTLE | |
5215 | template | |
5216 | void | |
5217 | Layout::layout_group<64, false>(Symbol_table* symtab, | |
6fa2a40b | 5218 | Sized_relobj_file<64, false>* object, |
6a74a719 ILT |
5219 | unsigned int, |
5220 | const char* group_section_name, | |
5221 | const char* signature, | |
5222 | const elfcpp::Shdr<64, false>& shdr, | |
8825ac63 ILT |
5223 | elfcpp::Elf_Word flags, |
5224 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5225 | #endif |
5226 | ||
5227 | #ifdef HAVE_TARGET_64_BIG | |
5228 | template | |
5229 | void | |
5230 | Layout::layout_group<64, true>(Symbol_table* symtab, | |
6fa2a40b | 5231 | Sized_relobj_file<64, true>* object, |
6a74a719 ILT |
5232 | unsigned int, |
5233 | const char* group_section_name, | |
5234 | const char* signature, | |
5235 | const elfcpp::Shdr<64, true>& shdr, | |
8825ac63 ILT |
5236 | elfcpp::Elf_Word flags, |
5237 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
5238 | #endif |
5239 | ||
730cdc88 ILT |
5240 | #ifdef HAVE_TARGET_32_LITTLE |
5241 | template | |
5242 | Output_section* | |
6fa2a40b | 5243 | Layout::layout_eh_frame<32, false>(Sized_relobj_file<32, false>* object, |
730cdc88 ILT |
5244 | const unsigned char* symbols, |
5245 | off_t symbols_size, | |
5246 | const unsigned char* symbol_names, | |
5247 | off_t symbol_names_size, | |
5248 | unsigned int shndx, | |
5249 | const elfcpp::Shdr<32, false>& shdr, | |
5250 | unsigned int reloc_shndx, | |
5251 | unsigned int reloc_type, | |
5252 | off_t* off); | |
5253 | #endif | |
5254 | ||
5255 | #ifdef HAVE_TARGET_32_BIG | |
5256 | template | |
5257 | Output_section* | |
6fa2a40b CC |
5258 | Layout::layout_eh_frame<32, true>(Sized_relobj_file<32, true>* object, |
5259 | const unsigned char* symbols, | |
5260 | off_t symbols_size, | |
730cdc88 ILT |
5261 | const unsigned char* symbol_names, |
5262 | off_t symbol_names_size, | |
5263 | unsigned int shndx, | |
5264 | const elfcpp::Shdr<32, true>& shdr, | |
5265 | unsigned int reloc_shndx, | |
5266 | unsigned int reloc_type, | |
5267 | off_t* off); | |
5268 | #endif | |
5269 | ||
5270 | #ifdef HAVE_TARGET_64_LITTLE | |
5271 | template | |
5272 | Output_section* | |
6fa2a40b | 5273 | Layout::layout_eh_frame<64, false>(Sized_relobj_file<64, false>* object, |
730cdc88 ILT |
5274 | const unsigned char* symbols, |
5275 | off_t symbols_size, | |
5276 | const unsigned char* symbol_names, | |
5277 | off_t symbol_names_size, | |
5278 | unsigned int shndx, | |
5279 | const elfcpp::Shdr<64, false>& shdr, | |
5280 | unsigned int reloc_shndx, | |
5281 | unsigned int reloc_type, | |
5282 | off_t* off); | |
5283 | #endif | |
5284 | ||
5285 | #ifdef HAVE_TARGET_64_BIG | |
5286 | template | |
5287 | Output_section* | |
6fa2a40b CC |
5288 | Layout::layout_eh_frame<64, true>(Sized_relobj_file<64, true>* object, |
5289 | const unsigned char* symbols, | |
5290 | off_t symbols_size, | |
730cdc88 ILT |
5291 | const unsigned char* symbol_names, |
5292 | off_t symbol_names_size, | |
5293 | unsigned int shndx, | |
5294 | const elfcpp::Shdr<64, true>& shdr, | |
5295 | unsigned int reloc_shndx, | |
5296 | unsigned int reloc_type, | |
5297 | off_t* off); | |
5298 | #endif | |
a2fb1b05 ILT |
5299 | |
5300 | } // End namespace gold. |