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