Commit | Line | Data |
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a2fb1b05 ILT |
1 | // layout.cc -- lay out output file sections for gold |
2 | ||
f1ec9ded | 3 | // Copyright 2006, 2007, 2008, 2009, 2010 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 | ||
20e6d0d6 DK |
58 | // Layout::Relaxation_debug_check methods. |
59 | ||
60 | // Check that sections and special data are in reset states. | |
61 | // We do not save states for Output_sections and special Output_data. | |
62 | // So we check that they have not assigned any addresses or offsets. | |
63 | // clean_up_after_relaxation simply resets their addresses and offsets. | |
64 | void | |
65 | Layout::Relaxation_debug_check::check_output_data_for_reset_values( | |
66 | const Layout::Section_list& sections, | |
67 | const Layout::Data_list& special_outputs) | |
68 | { | |
69 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
70 | p != sections.end(); | |
71 | ++p) | |
72 | gold_assert((*p)->address_and_file_offset_have_reset_values()); | |
73 | ||
74 | for(Layout::Data_list::const_iterator p = special_outputs.begin(); | |
75 | p != special_outputs.end(); | |
76 | ++p) | |
77 | gold_assert((*p)->address_and_file_offset_have_reset_values()); | |
78 | } | |
79 | ||
80 | // Save information of SECTIONS for checking later. | |
81 | ||
82 | void | |
83 | Layout::Relaxation_debug_check::read_sections( | |
84 | const Layout::Section_list& sections) | |
85 | { | |
86 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
87 | p != sections.end(); | |
88 | ++p) | |
89 | { | |
90 | Output_section* os = *p; | |
91 | Section_info info; | |
92 | info.output_section = os; | |
93 | info.address = os->is_address_valid() ? os->address() : 0; | |
94 | info.data_size = os->is_data_size_valid() ? os->data_size() : -1; | |
95 | info.offset = os->is_offset_valid()? os->offset() : -1 ; | |
96 | this->section_infos_.push_back(info); | |
97 | } | |
98 | } | |
99 | ||
100 | // Verify SECTIONS using previously recorded information. | |
101 | ||
102 | void | |
103 | Layout::Relaxation_debug_check::verify_sections( | |
104 | const Layout::Section_list& sections) | |
105 | { | |
106 | size_t i = 0; | |
107 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
108 | p != sections.end(); | |
109 | ++p, ++i) | |
110 | { | |
111 | Output_section* os = *p; | |
112 | uint64_t address = os->is_address_valid() ? os->address() : 0; | |
113 | off_t data_size = os->is_data_size_valid() ? os->data_size() : -1; | |
114 | off_t offset = os->is_offset_valid()? os->offset() : -1 ; | |
115 | ||
116 | if (i >= this->section_infos_.size()) | |
117 | { | |
118 | gold_fatal("Section_info of %s missing.\n", os->name()); | |
119 | } | |
120 | const Section_info& info = this->section_infos_[i]; | |
121 | if (os != info.output_section) | |
122 | gold_fatal("Section order changed. Expecting %s but see %s\n", | |
123 | info.output_section->name(), os->name()); | |
124 | if (address != info.address | |
125 | || data_size != info.data_size | |
126 | || offset != info.offset) | |
127 | gold_fatal("Section %s changed.\n", os->name()); | |
128 | } | |
129 | } | |
130 | ||
92e059d8 | 131 | // Layout_task_runner methods. |
a2fb1b05 ILT |
132 | |
133 | // Lay out the sections. This is called after all the input objects | |
134 | // have been read. | |
135 | ||
136 | void | |
17a1d0a9 | 137 | Layout_task_runner::run(Workqueue* workqueue, const Task* task) |
a2fb1b05 | 138 | { |
12e14209 | 139 | off_t file_size = this->layout_->finalize(this->input_objects_, |
17a1d0a9 | 140 | this->symtab_, |
8851ecca | 141 | this->target_, |
17a1d0a9 | 142 | task); |
61ba1cf9 ILT |
143 | |
144 | // Now we know the final size of the output file and we know where | |
145 | // each piece of information goes. | |
7d9e3d98 ILT |
146 | |
147 | if (this->mapfile_ != NULL) | |
148 | { | |
149 | this->mapfile_->print_discarded_sections(this->input_objects_); | |
150 | this->layout_->print_to_mapfile(this->mapfile_); | |
151 | } | |
152 | ||
8851ecca | 153 | Output_file* of = new Output_file(parameters->options().output_file_name()); |
7cc619c3 | 154 | if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 | 155 | of->set_is_temporary(); |
61ba1cf9 ILT |
156 | of->open(file_size); |
157 | ||
158 | // Queue up the final set of tasks. | |
159 | gold::queue_final_tasks(this->options_, this->input_objects_, | |
12e14209 | 160 | this->symtab_, this->layout_, workqueue, of); |
a2fb1b05 ILT |
161 | } |
162 | ||
163 | // Layout methods. | |
164 | ||
2ea97941 | 165 | Layout::Layout(int number_of_input_files, Script_options* script_options) |
e55bde5e | 166 | : number_of_input_files_(number_of_input_files), |
2ea97941 | 167 | script_options_(script_options), |
d491d34e ILT |
168 | namepool_(), |
169 | sympool_(), | |
170 | dynpool_(), | |
171 | signatures_(), | |
172 | section_name_map_(), | |
173 | segment_list_(), | |
174 | section_list_(), | |
175 | unattached_section_list_(), | |
d491d34e ILT |
176 | special_output_list_(), |
177 | section_headers_(NULL), | |
178 | tls_segment_(NULL), | |
9f1d377b | 179 | relro_segment_(NULL), |
1a2dff53 | 180 | increase_relro_(0), |
d491d34e ILT |
181 | symtab_section_(NULL), |
182 | symtab_xindex_(NULL), | |
183 | dynsym_section_(NULL), | |
184 | dynsym_xindex_(NULL), | |
185 | dynamic_section_(NULL), | |
f0ba79e2 | 186 | dynamic_symbol_(NULL), |
d491d34e ILT |
187 | dynamic_data_(NULL), |
188 | eh_frame_section_(NULL), | |
189 | eh_frame_data_(NULL), | |
190 | added_eh_frame_data_(false), | |
191 | eh_frame_hdr_section_(NULL), | |
192 | build_id_note_(NULL), | |
62b01cb5 ILT |
193 | debug_abbrev_(NULL), |
194 | debug_info_(NULL), | |
d491d34e ILT |
195 | group_signatures_(), |
196 | output_file_size_(-1), | |
d7bb5745 | 197 | have_added_input_section_(false), |
e55bde5e | 198 | sections_are_attached_(false), |
35cdfc9a ILT |
199 | input_requires_executable_stack_(false), |
200 | input_with_gnu_stack_note_(false), | |
535890bb | 201 | input_without_gnu_stack_note_(false), |
17a1d0a9 | 202 | has_static_tls_(false), |
e55bde5e | 203 | any_postprocessing_sections_(false), |
3ce2c28e | 204 | resized_signatures_(false), |
1518dc8f | 205 | have_stabstr_section_(false), |
20e6d0d6 DK |
206 | incremental_inputs_(NULL), |
207 | record_output_section_data_from_script_(false), | |
208 | script_output_section_data_list_(), | |
209 | segment_states_(NULL), | |
210 | relaxation_debug_check_(NULL) | |
54dc6425 ILT |
211 | { |
212 | // Make space for more than enough segments for a typical file. | |
213 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
214 | this->segment_list_.reserve(12); |
215 | ||
27bc2bce ILT |
216 | // We expect two unattached Output_data objects: the file header and |
217 | // the segment headers. | |
218 | this->special_output_list_.reserve(2); | |
3ce2c28e ILT |
219 | |
220 | // Initialize structure needed for an incremental build. | |
221 | if (parameters->options().incremental()) | |
222 | this->incremental_inputs_ = new Incremental_inputs; | |
f7c8a183 ILT |
223 | |
224 | // The section name pool is worth optimizing in all cases, because | |
225 | // it is small, but there are often overlaps due to .rel sections. | |
226 | this->namepool_.set_optimize(); | |
54dc6425 ILT |
227 | } |
228 | ||
a2fb1b05 ILT |
229 | // Hash a key we use to look up an output section mapping. |
230 | ||
231 | size_t | |
232 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
233 | { | |
f0641a0b | 234 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
235 | } |
236 | ||
02d2ba74 ILT |
237 | // Returns whether the given section is in the list of |
238 | // debug-sections-used-by-some-version-of-gdb. Currently, | |
239 | // we've checked versions of gdb up to and including 6.7.1. | |
240 | ||
241 | static const char* gdb_sections[] = | |
242 | { ".debug_abbrev", | |
243 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
244 | ".debug_frame", | |
245 | ".debug_info", | |
246 | ".debug_line", | |
247 | ".debug_loc", | |
248 | ".debug_macinfo", | |
249 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
250 | ".debug_ranges", | |
251 | ".debug_str", | |
252 | }; | |
253 | ||
62b01cb5 ILT |
254 | static const char* lines_only_debug_sections[] = |
255 | { ".debug_abbrev", | |
256 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
257 | // ".debug_frame", | |
258 | ".debug_info", | |
259 | ".debug_line", | |
260 | // ".debug_loc", | |
261 | // ".debug_macinfo", | |
262 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
263 | // ".debug_ranges", | |
264 | ".debug_str", | |
265 | }; | |
266 | ||
02d2ba74 ILT |
267 | static inline bool |
268 | is_gdb_debug_section(const char* str) | |
269 | { | |
270 | // We can do this faster: binary search or a hashtable. But why bother? | |
271 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) | |
272 | if (strcmp(str, gdb_sections[i]) == 0) | |
273 | return true; | |
274 | return false; | |
275 | } | |
276 | ||
62b01cb5 ILT |
277 | static inline bool |
278 | is_lines_only_debug_section(const char* str) | |
279 | { | |
280 | // We can do this faster: binary search or a hashtable. But why bother? | |
281 | for (size_t i = 0; | |
282 | i < sizeof(lines_only_debug_sections)/sizeof(*lines_only_debug_sections); | |
283 | ++i) | |
284 | if (strcmp(str, lines_only_debug_sections[i]) == 0) | |
285 | return true; | |
286 | return false; | |
287 | } | |
288 | ||
a2fb1b05 ILT |
289 | // Whether to include this section in the link. |
290 | ||
291 | template<int size, bool big_endian> | |
292 | bool | |
730cdc88 | 293 | Layout::include_section(Sized_relobj<size, big_endian>*, const char* name, |
a2fb1b05 ILT |
294 | const elfcpp::Shdr<size, big_endian>& shdr) |
295 | { | |
fd06b4aa CC |
296 | if (shdr.get_sh_flags() & elfcpp::SHF_EXCLUDE) |
297 | return false; | |
298 | ||
a2fb1b05 ILT |
299 | switch (shdr.get_sh_type()) |
300 | { | |
301 | case elfcpp::SHT_NULL: | |
302 | case elfcpp::SHT_SYMTAB: | |
303 | case elfcpp::SHT_DYNSYM: | |
a2fb1b05 ILT |
304 | case elfcpp::SHT_HASH: |
305 | case elfcpp::SHT_DYNAMIC: | |
306 | case elfcpp::SHT_SYMTAB_SHNDX: | |
307 | return false; | |
308 | ||
5cb66f97 ILT |
309 | case elfcpp::SHT_STRTAB: |
310 | // Discard the sections which have special meanings in the ELF | |
311 | // ABI. Keep others (e.g., .stabstr). We could also do this by | |
312 | // checking the sh_link fields of the appropriate sections. | |
313 | return (strcmp(name, ".dynstr") != 0 | |
314 | && strcmp(name, ".strtab") != 0 | |
315 | && strcmp(name, ".shstrtab") != 0); | |
316 | ||
a2fb1b05 ILT |
317 | case elfcpp::SHT_RELA: |
318 | case elfcpp::SHT_REL: | |
319 | case elfcpp::SHT_GROUP: | |
7019cd25 ILT |
320 | // If we are emitting relocations these should be handled |
321 | // elsewhere. | |
8851ecca ILT |
322 | gold_assert(!parameters->options().relocatable() |
323 | && !parameters->options().emit_relocs()); | |
6a74a719 | 324 | return false; |
a2fb1b05 | 325 | |
9e2dcb77 | 326 | case elfcpp::SHT_PROGBITS: |
8851ecca | 327 | if (parameters->options().strip_debug() |
9e2dcb77 ILT |
328 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
329 | { | |
e94cf127 | 330 | if (is_debug_info_section(name)) |
9e2dcb77 ILT |
331 | return false; |
332 | } | |
62b01cb5 ILT |
333 | if (parameters->options().strip_debug_non_line() |
334 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
335 | { | |
336 | // Debugging sections can only be recognized by name. | |
337 | if (is_prefix_of(".debug", name) | |
338 | && !is_lines_only_debug_section(name)) | |
339 | return false; | |
340 | } | |
8851ecca | 341 | if (parameters->options().strip_debug_gdb() |
02d2ba74 ILT |
342 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
343 | { | |
344 | // Debugging sections can only be recognized by name. | |
345 | if (is_prefix_of(".debug", name) | |
346 | && !is_gdb_debug_section(name)) | |
347 | return false; | |
348 | } | |
fd06b4aa CC |
349 | if (parameters->options().strip_lto_sections() |
350 | && !parameters->options().relocatable() | |
351 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
352 | { | |
353 | // Ignore LTO sections containing intermediate code. | |
354 | if (is_prefix_of(".gnu.lto_", name)) | |
355 | return false; | |
356 | } | |
6b7dd3f3 ILT |
357 | // The GNU linker strips .gnu_debuglink sections, so we do too. |
358 | // This is a feature used to keep debugging information in | |
359 | // separate files. | |
360 | if (strcmp(name, ".gnu_debuglink") == 0) | |
361 | return false; | |
9e2dcb77 ILT |
362 | return true; |
363 | ||
a2fb1b05 | 364 | default: |
a2fb1b05 ILT |
365 | return true; |
366 | } | |
367 | } | |
368 | ||
ead1e424 | 369 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 370 | |
a2fb1b05 | 371 | Output_section* |
ead1e424 | 372 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 373 | { |
a445fddf ILT |
374 | for (Section_list::const_iterator p = this->section_list_.begin(); |
375 | p != this->section_list_.end(); | |
ead1e424 | 376 | ++p) |
a445fddf ILT |
377 | if (strcmp((*p)->name(), name) == 0) |
378 | return *p; | |
ead1e424 ILT |
379 | return NULL; |
380 | } | |
a2fb1b05 | 381 | |
ead1e424 ILT |
382 | // Return an output segment of type TYPE, with segment flags SET set |
383 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 384 | |
ead1e424 ILT |
385 | Output_segment* |
386 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
387 | elfcpp::Elf_Word clear) const | |
388 | { | |
389 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
390 | p != this->segment_list_.end(); | |
391 | ++p) | |
392 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
393 | && ((*p)->flags() & set) == set | |
394 | && ((*p)->flags() & clear) == 0) | |
395 | return *p; | |
396 | return NULL; | |
397 | } | |
a2fb1b05 | 398 | |
ead1e424 | 399 | // Return the output section to use for section NAME with type TYPE |
a445fddf | 400 | // and section flags FLAGS. NAME must be canonicalized in the string |
f5c870d2 ILT |
401 | // pool, and NAME_KEY is the key. IS_INTERP is true if this is the |
402 | // .interp section. IS_DYNAMIC_LINKER_SECTION is true if this section | |
1a2dff53 ILT |
403 | // is used by the dynamic linker. IS_RELRO is true for a relro |
404 | // section. IS_LAST_RELRO is true for the last relro section. | |
405 | // IS_FIRST_NON_RELRO is true for the first non-relro section. | |
a2fb1b05 | 406 | |
ead1e424 | 407 | Output_section* |
f0641a0b | 408 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
f5c870d2 | 409 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, |
1a2dff53 ILT |
410 | bool is_interp, bool is_dynamic_linker_section, |
411 | bool is_relro, bool is_last_relro, | |
412 | bool is_first_non_relro) | |
ead1e424 | 413 | { |
154e0e9a ILT |
414 | elfcpp::Elf_Xword lookup_flags = flags; |
415 | ||
416 | // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine | |
417 | // read-write with read-only sections. Some other ELF linkers do | |
418 | // not do this. FIXME: Perhaps there should be an option | |
419 | // controlling this. | |
420 | lookup_flags &= ~(elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
421 | ||
422 | const Key key(name_key, std::make_pair(type, lookup_flags)); | |
a2fb1b05 ILT |
423 | const std::pair<Key, Output_section*> v(key, NULL); |
424 | std::pair<Section_name_map::iterator, bool> ins( | |
425 | this->section_name_map_.insert(v)); | |
426 | ||
a2fb1b05 | 427 | if (!ins.second) |
ead1e424 | 428 | return ins.first->second; |
a2fb1b05 ILT |
429 | else |
430 | { | |
431 | // This is the first time we've seen this name/type/flags | |
4e2b1697 ILT |
432 | // combination. For compatibility with the GNU linker, we |
433 | // combine sections with contents and zero flags with sections | |
434 | // with non-zero flags. This is a workaround for cases where | |
435 | // assembler code forgets to set section flags. FIXME: Perhaps | |
436 | // there should be an option to control this. | |
15cf077e | 437 | Output_section* os = NULL; |
4e2b1697 ILT |
438 | |
439 | if (type == elfcpp::SHT_PROGBITS) | |
15cf077e | 440 | { |
4e2b1697 ILT |
441 | if (flags == 0) |
442 | { | |
443 | Output_section* same_name = this->find_output_section(name); | |
444 | if (same_name != NULL | |
445 | && same_name->type() == elfcpp::SHT_PROGBITS | |
446 | && (same_name->flags() & elfcpp::SHF_TLS) == 0) | |
447 | os = same_name; | |
448 | } | |
449 | else if ((flags & elfcpp::SHF_TLS) == 0) | |
450 | { | |
451 | elfcpp::Elf_Xword zero_flags = 0; | |
452 | const Key zero_key(name_key, std::make_pair(type, zero_flags)); | |
453 | Section_name_map::iterator p = | |
454 | this->section_name_map_.find(zero_key); | |
455 | if (p != this->section_name_map_.end()) | |
154e0e9a | 456 | os = p->second; |
4e2b1697 | 457 | } |
15cf077e | 458 | } |
4e2b1697 | 459 | |
15cf077e | 460 | if (os == NULL) |
f5c870d2 | 461 | os = this->make_output_section(name, type, flags, is_interp, |
1a2dff53 ILT |
462 | is_dynamic_linker_section, is_relro, |
463 | is_last_relro, is_first_non_relro); | |
a2fb1b05 | 464 | ins.first->second = os; |
ead1e424 | 465 | return os; |
a2fb1b05 | 466 | } |
ead1e424 ILT |
467 | } |
468 | ||
a445fddf ILT |
469 | // Pick the output section to use for section NAME, in input file |
470 | // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a | |
154e0e9a ILT |
471 | // linker created section. IS_INPUT_SECTION is true if we are |
472 | // choosing an output section for an input section found in a input | |
f5c870d2 ILT |
473 | // file. IS_INTERP is true if this is the .interp section. |
474 | // IS_DYNAMIC_LINKER_SECTION is true if this section is used by the | |
1a2dff53 ILT |
475 | // dynamic linker. IS_RELRO is true for a relro section. |
476 | // IS_LAST_RELRO is true for the last relro section. | |
477 | // IS_FIRST_NON_RELRO is true for the first non-relro section. This | |
478 | // will return NULL if the input section should be discarded. | |
a445fddf ILT |
479 | |
480 | Output_section* | |
481 | Layout::choose_output_section(const Relobj* relobj, const char* name, | |
482 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
f5c870d2 | 483 | bool is_input_section, bool is_interp, |
1a2dff53 ILT |
484 | bool is_dynamic_linker_section, bool is_relro, |
485 | bool is_last_relro, bool is_first_non_relro) | |
a445fddf | 486 | { |
154e0e9a ILT |
487 | // We should not see any input sections after we have attached |
488 | // sections to segments. | |
489 | gold_assert(!is_input_section || !this->sections_are_attached_); | |
490 | ||
491 | // Some flags in the input section should not be automatically | |
492 | // copied to the output section. | |
a445fddf ILT |
493 | flags &= ~ (elfcpp::SHF_INFO_LINK |
494 | | elfcpp::SHF_LINK_ORDER | |
495 | | elfcpp::SHF_GROUP | |
496 | | elfcpp::SHF_MERGE | |
497 | | elfcpp::SHF_STRINGS); | |
498 | ||
499 | if (this->script_options_->saw_sections_clause()) | |
500 | { | |
501 | // We are using a SECTIONS clause, so the output section is | |
502 | // chosen based only on the name. | |
503 | ||
504 | Script_sections* ss = this->script_options_->script_sections(); | |
505 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
506 | Output_section** output_section_slot; | |
1e5d2fb1 DK |
507 | Script_sections::Section_type script_section_type; |
508 | name = ss->output_section_name(file_name, name, &output_section_slot, | |
509 | &script_section_type); | |
a445fddf ILT |
510 | if (name == NULL) |
511 | { | |
512 | // The SECTIONS clause says to discard this input section. | |
513 | return NULL; | |
514 | } | |
515 | ||
1e5d2fb1 DK |
516 | // We can only handle script section types ST_NONE and ST_NOLOAD. |
517 | switch (script_section_type) | |
518 | { | |
519 | case Script_sections::ST_NONE: | |
520 | break; | |
521 | case Script_sections::ST_NOLOAD: | |
522 | flags &= elfcpp::SHF_ALLOC; | |
523 | break; | |
524 | default: | |
525 | gold_unreachable(); | |
526 | } | |
527 | ||
a445fddf ILT |
528 | // If this is an orphan section--one not mentioned in the linker |
529 | // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the | |
530 | // default processing below. | |
531 | ||
532 | if (output_section_slot != NULL) | |
533 | { | |
534 | if (*output_section_slot != NULL) | |
9c547ec3 ILT |
535 | { |
536 | (*output_section_slot)->update_flags_for_input_section(flags); | |
537 | return *output_section_slot; | |
538 | } | |
a445fddf ILT |
539 | |
540 | // We don't put sections found in the linker script into | |
541 | // SECTION_NAME_MAP_. That keeps us from getting confused | |
542 | // if an orphan section is mapped to a section with the same | |
543 | // name as one in the linker script. | |
544 | ||
545 | name = this->namepool_.add(name, false, NULL); | |
546 | ||
f5c870d2 ILT |
547 | Output_section* os = |
548 | this->make_output_section(name, type, flags, is_interp, | |
1a2dff53 ILT |
549 | is_dynamic_linker_section, is_relro, |
550 | is_last_relro, is_first_non_relro); | |
a445fddf | 551 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
552 | |
553 | // Special handling for NOLOAD sections. | |
554 | if (script_section_type == Script_sections::ST_NOLOAD) | |
555 | { | |
556 | os->set_is_noload(); | |
557 | ||
558 | // The constructor of Output_section sets addresses of non-ALLOC | |
559 | // sections to 0 by default. We don't want that for NOLOAD | |
560 | // sections even if they have no SHF_ALLOC flag. | |
561 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0 | |
562 | && os->is_address_valid()) | |
563 | { | |
564 | gold_assert(os->address() == 0 | |
565 | && !os->is_offset_valid() | |
566 | && !os->is_data_size_valid()); | |
567 | os->reset_address_and_file_offset(); | |
568 | } | |
569 | } | |
570 | ||
a445fddf ILT |
571 | *output_section_slot = os; |
572 | return os; | |
573 | } | |
574 | } | |
575 | ||
576 | // FIXME: Handle SHF_OS_NONCONFORMING somewhere. | |
577 | ||
578 | // Turn NAME from the name of the input section into the name of the | |
579 | // output section. | |
580 | ||
581 | size_t len = strlen(name); | |
401a9a73 CC |
582 | if (is_input_section |
583 | && !this->script_options_->saw_sections_clause() | |
584 | && !parameters->options().relocatable()) | |
a445fddf ILT |
585 | name = Layout::output_section_name(name, &len); |
586 | ||
587 | Stringpool::Key name_key; | |
588 | name = this->namepool_.add_with_length(name, len, true, &name_key); | |
589 | ||
590 | // Find or make the output section. The output section is selected | |
591 | // based on the section name, type, and flags. | |
f5c870d2 | 592 | return this->get_output_section(name, name_key, type, flags, is_interp, |
1a2dff53 ILT |
593 | is_dynamic_linker_section, is_relro, |
594 | is_last_relro, is_first_non_relro); | |
a445fddf ILT |
595 | } |
596 | ||
ead1e424 | 597 | // Return the output section to use for input section SHNDX, with name |
730cdc88 ILT |
598 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
599 | // index of a relocation section which applies to this section, or 0 | |
600 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
601 | // relocation section if there is one. Set *OFF to the offset of this | |
602 | // input section without the output section. Return NULL if the | |
603 | // section should be discarded. Set *OFF to -1 if the section | |
604 | // contents should not be written directly to the output file, but | |
605 | // will instead receive special handling. | |
ead1e424 ILT |
606 | |
607 | template<int size, bool big_endian> | |
608 | Output_section* | |
730cdc88 ILT |
609 | Layout::layout(Sized_relobj<size, big_endian>* object, unsigned int shndx, |
610 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, | |
611 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 | 612 | { |
ef9beddf ILT |
613 | *off = 0; |
614 | ||
ead1e424 ILT |
615 | if (!this->include_section(object, name, shdr)) |
616 | return NULL; | |
617 | ||
6a74a719 ILT |
618 | Output_section* os; |
619 | ||
2a0ff005 DK |
620 | // Sometimes .init_array*, .preinit_array* and .fini_array* do not have |
621 | // correct section types. Force them here. | |
622 | elfcpp::Elf_Word sh_type = shdr.get_sh_type(); | |
623 | if (sh_type == elfcpp::SHT_PROGBITS) | |
624 | { | |
625 | static const char init_array_prefix[] = ".init_array"; | |
626 | static const char preinit_array_prefix[] = ".preinit_array"; | |
627 | static const char fini_array_prefix[] = ".fini_array"; | |
628 | static size_t init_array_prefix_size = sizeof(init_array_prefix) - 1; | |
629 | static size_t preinit_array_prefix_size = | |
630 | sizeof(preinit_array_prefix) - 1; | |
631 | static size_t fini_array_prefix_size = sizeof(fini_array_prefix) - 1; | |
632 | ||
633 | if (strncmp(name, init_array_prefix, init_array_prefix_size) == 0) | |
634 | sh_type = elfcpp::SHT_INIT_ARRAY; | |
635 | else if (strncmp(name, preinit_array_prefix, preinit_array_prefix_size) | |
636 | == 0) | |
637 | sh_type = elfcpp::SHT_PREINIT_ARRAY; | |
638 | else if (strncmp(name, fini_array_prefix, fini_array_prefix_size) == 0) | |
639 | sh_type = elfcpp::SHT_FINI_ARRAY; | |
640 | } | |
641 | ||
6a74a719 ILT |
642 | // In a relocatable link a grouped section must not be combined with |
643 | // any other sections. | |
8851ecca | 644 | if (parameters->options().relocatable() |
6a74a719 ILT |
645 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
646 | { | |
647 | name = this->namepool_.add(name, true, NULL); | |
2a0ff005 DK |
648 | os = this->make_output_section(name, sh_type, shdr.get_sh_flags(), false, |
649 | false, false, false, false); | |
6a74a719 ILT |
650 | } |
651 | else | |
652 | { | |
2a0ff005 | 653 | os = this->choose_output_section(object, name, sh_type, |
f5c870d2 | 654 | shdr.get_sh_flags(), true, false, |
1a2dff53 | 655 | false, false, false, false); |
6a74a719 ILT |
656 | if (os == NULL) |
657 | return NULL; | |
658 | } | |
a2fb1b05 | 659 | |
2fd32231 ILT |
660 | // By default the GNU linker sorts input sections whose names match |
661 | // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*. The sections | |
662 | // are sorted by name. This is used to implement constructor | |
663 | // priority ordering. We are compatible. | |
664 | if (!this->script_options_->saw_sections_clause() | |
665 | && (is_prefix_of(".ctors.", name) | |
666 | || is_prefix_of(".dtors.", name) | |
667 | || is_prefix_of(".init_array.", name) | |
668 | || is_prefix_of(".fini_array.", name))) | |
669 | os->set_must_sort_attached_input_sections(); | |
670 | ||
a2fb1b05 ILT |
671 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
672 | ||
6e9ba2ca | 673 | *off = os->add_input_section(this, object, shndx, name, shdr, reloc_shndx, |
a445fddf | 674 | this->script_options_->saw_sections_clause()); |
d7bb5745 | 675 | this->have_added_input_section_ = true; |
a2fb1b05 ILT |
676 | |
677 | return os; | |
678 | } | |
679 | ||
6a74a719 ILT |
680 | // Handle a relocation section when doing a relocatable link. |
681 | ||
682 | template<int size, bool big_endian> | |
683 | Output_section* | |
684 | Layout::layout_reloc(Sized_relobj<size, big_endian>* object, | |
685 | unsigned int, | |
686 | const elfcpp::Shdr<size, big_endian>& shdr, | |
687 | Output_section* data_section, | |
688 | Relocatable_relocs* rr) | |
689 | { | |
8851ecca ILT |
690 | gold_assert(parameters->options().relocatable() |
691 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
692 | |
693 | int sh_type = shdr.get_sh_type(); | |
694 | ||
695 | std::string name; | |
696 | if (sh_type == elfcpp::SHT_REL) | |
697 | name = ".rel"; | |
698 | else if (sh_type == elfcpp::SHT_RELA) | |
699 | name = ".rela"; | |
700 | else | |
701 | gold_unreachable(); | |
702 | name += data_section->name(); | |
703 | ||
bd288ea2 ILT |
704 | // In a relocatable link relocs for a grouped section must not be |
705 | // combined with other reloc sections. | |
706 | Output_section* os; | |
707 | if (!parameters->options().relocatable() | |
708 | || (data_section->flags() & elfcpp::SHF_GROUP) == 0) | |
709 | os = this->choose_output_section(object, name.c_str(), sh_type, | |
710 | shdr.get_sh_flags(), false, false, | |
711 | false, false, false, false); | |
712 | else | |
713 | { | |
714 | const char* n = this->namepool_.add(name.c_str(), true, NULL); | |
715 | os = this->make_output_section(n, sh_type, shdr.get_sh_flags(), | |
716 | false, false, false, false, false); | |
717 | } | |
6a74a719 ILT |
718 | |
719 | os->set_should_link_to_symtab(); | |
720 | os->set_info_section(data_section); | |
721 | ||
722 | Output_section_data* posd; | |
723 | if (sh_type == elfcpp::SHT_REL) | |
724 | { | |
725 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); | |
726 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, | |
727 | size, | |
728 | big_endian>(rr); | |
729 | } | |
730 | else if (sh_type == elfcpp::SHT_RELA) | |
731 | { | |
732 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); | |
733 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, | |
734 | size, | |
735 | big_endian>(rr); | |
736 | } | |
737 | else | |
738 | gold_unreachable(); | |
739 | ||
740 | os->add_output_section_data(posd); | |
741 | rr->set_output_data(posd); | |
742 | ||
743 | return os; | |
744 | } | |
745 | ||
746 | // Handle a group section when doing a relocatable link. | |
747 | ||
748 | template<int size, bool big_endian> | |
749 | void | |
750 | Layout::layout_group(Symbol_table* symtab, | |
751 | Sized_relobj<size, big_endian>* object, | |
752 | unsigned int, | |
753 | const char* group_section_name, | |
754 | const char* signature, | |
755 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
756 | elfcpp::Elf_Word flags, |
757 | std::vector<unsigned int>* shndxes) | |
6a74a719 | 758 | { |
8851ecca | 759 | gold_assert(parameters->options().relocatable()); |
6a74a719 ILT |
760 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
761 | group_section_name = this->namepool_.add(group_section_name, true, NULL); | |
762 | Output_section* os = this->make_output_section(group_section_name, | |
763 | elfcpp::SHT_GROUP, | |
f5c870d2 | 764 | shdr.get_sh_flags(), |
1a2dff53 | 765 | false, false, false, |
f5c870d2 | 766 | false, false); |
6a74a719 ILT |
767 | |
768 | // We need to find a symbol with the signature in the symbol table. | |
755ab8af | 769 | // If we don't find one now, we need to look again later. |
6a74a719 | 770 | Symbol* sym = symtab->lookup(signature, NULL); |
755ab8af ILT |
771 | if (sym != NULL) |
772 | os->set_info_symndx(sym); | |
773 | else | |
774 | { | |
e55bde5e ILT |
775 | // Reserve some space to minimize reallocations. |
776 | if (this->group_signatures_.empty()) | |
777 | this->group_signatures_.reserve(this->number_of_input_files_ * 16); | |
778 | ||
755ab8af ILT |
779 | // We will wind up using a symbol whose name is the signature. |
780 | // So just put the signature in the symbol name pool to save it. | |
781 | signature = symtab->canonicalize_name(signature); | |
782 | this->group_signatures_.push_back(Group_signature(os, signature)); | |
783 | } | |
6a74a719 ILT |
784 | |
785 | os->set_should_link_to_symtab(); | |
6a74a719 ILT |
786 | os->set_entsize(4); |
787 | ||
788 | section_size_type entry_count = | |
789 | convert_to_section_size_type(shdr.get_sh_size() / 4); | |
790 | Output_section_data* posd = | |
8825ac63 ILT |
791 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
792 | shndxes); | |
6a74a719 ILT |
793 | os->add_output_section_data(posd); |
794 | } | |
795 | ||
730cdc88 ILT |
796 | // Special GNU handling of sections name .eh_frame. They will |
797 | // normally hold exception frame data as defined by the C++ ABI | |
798 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
799 | |
800 | template<int size, bool big_endian> | |
730cdc88 ILT |
801 | Output_section* |
802 | Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object, | |
803 | const unsigned char* symbols, | |
804 | off_t symbols_size, | |
805 | const unsigned char* symbol_names, | |
806 | off_t symbol_names_size, | |
3151305a | 807 | unsigned int shndx, |
3151305a | 808 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
809 | unsigned int reloc_shndx, unsigned int reloc_type, |
810 | off_t* off) | |
3151305a | 811 | { |
730cdc88 | 812 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS); |
1650c4ff | 813 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 | 814 | |
a445fddf ILT |
815 | const char* const name = ".eh_frame"; |
816 | Output_section* os = this->choose_output_section(object, | |
817 | name, | |
818 | elfcpp::SHT_PROGBITS, | |
819 | elfcpp::SHF_ALLOC, | |
1a2dff53 | 820 | false, false, false, |
f5c870d2 | 821 | false, false, false); |
a445fddf ILT |
822 | if (os == NULL) |
823 | return NULL; | |
730cdc88 | 824 | |
3151305a ILT |
825 | if (this->eh_frame_section_ == NULL) |
826 | { | |
827 | this->eh_frame_section_ = os; | |
730cdc88 | 828 | this->eh_frame_data_ = new Eh_frame(); |
3151305a | 829 | |
e55bde5e | 830 | if (parameters->options().eh_frame_hdr()) |
3151305a | 831 | { |
3151305a | 832 | Output_section* hdr_os = |
a445fddf ILT |
833 | this->choose_output_section(NULL, |
834 | ".eh_frame_hdr", | |
835 | elfcpp::SHT_PROGBITS, | |
836 | elfcpp::SHF_ALLOC, | |
1a2dff53 | 837 | false, false, false, |
f5c870d2 | 838 | false, false, false); |
3151305a | 839 | |
a445fddf ILT |
840 | if (hdr_os != NULL) |
841 | { | |
842 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, | |
843 | this->eh_frame_data_); | |
844 | hdr_os->add_output_section_data(hdr_posd); | |
3151305a | 845 | |
a445fddf | 846 | hdr_os->set_after_input_sections(); |
730cdc88 | 847 | |
1c4f3631 ILT |
848 | if (!this->script_options_->saw_phdrs_clause()) |
849 | { | |
850 | Output_segment* hdr_oseg; | |
851 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, | |
852 | elfcpp::PF_R); | |
f5c870d2 | 853 | hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R, false); |
1c4f3631 | 854 | } |
730cdc88 | 855 | |
a445fddf ILT |
856 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); |
857 | } | |
3151305a ILT |
858 | } |
859 | } | |
860 | ||
861 | gold_assert(this->eh_frame_section_ == os); | |
862 | ||
730cdc88 ILT |
863 | if (this->eh_frame_data_->add_ehframe_input_section(object, |
864 | symbols, | |
865 | symbols_size, | |
866 | symbol_names, | |
867 | symbol_names_size, | |
868 | shndx, | |
869 | reloc_shndx, | |
870 | reloc_type)) | |
2c38906f | 871 | { |
154e0e9a ILT |
872 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
873 | ||
2c38906f ILT |
874 | // We found a .eh_frame section we are going to optimize, so now |
875 | // we can add the set of optimized sections to the output | |
876 | // section. We need to postpone adding this until we've found a | |
877 | // section we can optimize so that the .eh_frame section in | |
878 | // crtbegin.o winds up at the start of the output section. | |
879 | if (!this->added_eh_frame_data_) | |
880 | { | |
881 | os->add_output_section_data(this->eh_frame_data_); | |
882 | this->added_eh_frame_data_ = true; | |
883 | } | |
884 | *off = -1; | |
885 | } | |
730cdc88 ILT |
886 | else |
887 | { | |
888 | // We couldn't handle this .eh_frame section for some reason. | |
889 | // Add it as a normal section. | |
a445fddf | 890 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); |
6e9ba2ca | 891 | *off = os->add_input_section(this, object, shndx, name, shdr, reloc_shndx, |
a445fddf | 892 | saw_sections_clause); |
d7bb5745 | 893 | this->have_added_input_section_ = true; |
730cdc88 ILT |
894 | } |
895 | ||
896 | return os; | |
3151305a ILT |
897 | } |
898 | ||
9f1d377b ILT |
899 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
900 | // the output section. | |
ead1e424 | 901 | |
9f1d377b | 902 | Output_section* |
ead1e424 ILT |
903 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
904 | elfcpp::Elf_Xword flags, | |
f5c870d2 | 905 | Output_section_data* posd, |
1a2dff53 ILT |
906 | bool is_dynamic_linker_section, |
907 | bool is_relro, bool is_last_relro, | |
908 | bool is_first_non_relro) | |
ead1e424 | 909 | { |
a445fddf | 910 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
f5c870d2 | 911 | false, false, |
1a2dff53 ILT |
912 | is_dynamic_linker_section, |
913 | is_relro, is_last_relro, | |
914 | is_first_non_relro); | |
a445fddf ILT |
915 | if (os != NULL) |
916 | os->add_output_section_data(posd); | |
9f1d377b | 917 | return os; |
ead1e424 ILT |
918 | } |
919 | ||
a2fb1b05 ILT |
920 | // Map section flags to segment flags. |
921 | ||
922 | elfcpp::Elf_Word | |
923 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
924 | { | |
925 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
926 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
927 | ret |= elfcpp::PF_W; | |
928 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
929 | ret |= elfcpp::PF_X; | |
930 | return ret; | |
931 | } | |
932 | ||
96803768 ILT |
933 | // Sometimes we compress sections. This is typically done for |
934 | // sections that are not part of normal program execution (such as | |
935 | // .debug_* sections), and where the readers of these sections know | |
c3b65ac4 CD |
936 | // how to deal with compressed sections. This routine doesn't say for |
937 | // certain whether we'll compress -- it depends on commandline options | |
938 | // as well -- just whether this section is a candidate for compression. | |
939 | // (The Output_compressed_section class decides whether to compress | |
940 | // a given section, and picks the name of the compressed section.) | |
96803768 ILT |
941 | |
942 | static bool | |
943 | is_compressible_debug_section(const char* secname) | |
944 | { | |
945 | return (strncmp(secname, ".debug", sizeof(".debug") - 1) == 0); | |
946 | } | |
947 | ||
a2fb1b05 | 948 | // Make a new Output_section, and attach it to segments as |
f5c870d2 ILT |
949 | // appropriate. IS_INTERP is true if this is the .interp section. |
950 | // IS_DYNAMIC_LINKER_SECTION is true if this section is used by the | |
1a2dff53 ILT |
951 | // dynamic linker. IS_RELRO is true if this is a relro section. |
952 | // IS_LAST_RELRO is true if this is the last relro section. | |
953 | // IS_FIRST_NON_RELRO is true if this is the first non relro section. | |
a2fb1b05 ILT |
954 | |
955 | Output_section* | |
956 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
f5c870d2 | 957 | elfcpp::Elf_Xword flags, bool is_interp, |
1a2dff53 ILT |
958 | bool is_dynamic_linker_section, bool is_relro, |
959 | bool is_last_relro, bool is_first_non_relro) | |
a2fb1b05 | 960 | { |
96803768 ILT |
961 | Output_section* os; |
962 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 963 | && strcmp(parameters->options().compress_debug_sections(), "none") != 0 |
96803768 | 964 | && is_compressible_debug_section(name)) |
e55bde5e ILT |
965 | os = new Output_compressed_section(¶meters->options(), name, type, |
966 | flags); | |
62b01cb5 | 967 | else if ((flags & elfcpp::SHF_ALLOC) == 0 |
e55bde5e | 968 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
969 | && strcmp(".debug_abbrev", name) == 0) |
970 | { | |
971 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( | |
972 | name, type, flags); | |
973 | if (this->debug_info_) | |
974 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
975 | } | |
976 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 977 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
978 | && strcmp(".debug_info", name) == 0) |
979 | { | |
980 | os = this->debug_info_ = new Output_reduced_debug_info_section( | |
981 | name, type, flags); | |
982 | if (this->debug_abbrev_) | |
983 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
984 | } | |
985 | else | |
c0a62865 DK |
986 | { |
987 | // FIXME: const_cast is ugly. | |
988 | Target* target = const_cast<Target*>(¶meters->target()); | |
989 | os = target->make_output_section(name, type, flags); | |
990 | } | |
96803768 | 991 | |
f5c870d2 ILT |
992 | if (is_interp) |
993 | os->set_is_interp(); | |
994 | if (is_dynamic_linker_section) | |
995 | os->set_is_dynamic_linker_section(); | |
1a2dff53 ILT |
996 | if (is_relro) |
997 | os->set_is_relro(); | |
998 | if (is_last_relro) | |
999 | os->set_is_last_relro(); | |
1000 | if (is_first_non_relro) | |
1001 | os->set_is_first_non_relro(); | |
f5c870d2 | 1002 | |
8a5e3e08 ILT |
1003 | parameters->target().new_output_section(os); |
1004 | ||
a3ad94ed | 1005 | this->section_list_.push_back(os); |
a2fb1b05 | 1006 | |
2fd32231 ILT |
1007 | // The GNU linker by default sorts some sections by priority, so we |
1008 | // do the same. We need to know that this might happen before we | |
1009 | // attach any input sections. | |
1010 | if (!this->script_options_->saw_sections_clause() | |
1011 | && (strcmp(name, ".ctors") == 0 | |
1012 | || strcmp(name, ".dtors") == 0 | |
1013 | || strcmp(name, ".init_array") == 0 | |
1014 | || strcmp(name, ".fini_array") == 0)) | |
1015 | os->set_may_sort_attached_input_sections(); | |
1016 | ||
9f1d377b ILT |
1017 | // With -z relro, we have to recognize the special sections by name. |
1018 | // There is no other way. | |
1019 | if (!this->script_options_->saw_sections_clause() | |
1020 | && parameters->options().relro() | |
1021 | && type == elfcpp::SHT_PROGBITS | |
1022 | && (flags & elfcpp::SHF_ALLOC) != 0 | |
1023 | && (flags & elfcpp::SHF_WRITE) != 0) | |
1024 | { | |
1025 | if (strcmp(name, ".data.rel.ro") == 0) | |
1026 | os->set_is_relro(); | |
1027 | else if (strcmp(name, ".data.rel.ro.local") == 0) | |
1028 | { | |
1029 | os->set_is_relro(); | |
1030 | os->set_is_relro_local(); | |
1031 | } | |
1032 | } | |
1033 | ||
1518dc8f ILT |
1034 | // Check for .stab*str sections, as .stab* sections need to link to |
1035 | // them. | |
1036 | if (type == elfcpp::SHT_STRTAB | |
1037 | && !this->have_stabstr_section_ | |
1038 | && strncmp(name, ".stab", 5) == 0 | |
1039 | && strcmp(name + strlen(name) - 3, "str") == 0) | |
1040 | this->have_stabstr_section_ = true; | |
1041 | ||
154e0e9a ILT |
1042 | // If we have already attached the sections to segments, then we |
1043 | // need to attach this one now. This happens for sections created | |
1044 | // directly by the linker. | |
1045 | if (this->sections_are_attached_) | |
1046 | this->attach_section_to_segment(os); | |
1047 | ||
4e2b1697 ILT |
1048 | return os; |
1049 | } | |
a445fddf | 1050 | |
154e0e9a ILT |
1051 | // Attach output sections to segments. This is called after we have |
1052 | // seen all the input sections. | |
1053 | ||
1054 | void | |
1055 | Layout::attach_sections_to_segments() | |
1056 | { | |
1057 | for (Section_list::iterator p = this->section_list_.begin(); | |
1058 | p != this->section_list_.end(); | |
1059 | ++p) | |
1060 | this->attach_section_to_segment(*p); | |
1061 | ||
1062 | this->sections_are_attached_ = true; | |
1063 | } | |
1064 | ||
1065 | // Attach an output section to a segment. | |
1066 | ||
1067 | void | |
1068 | Layout::attach_section_to_segment(Output_section* os) | |
1069 | { | |
1070 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
1071 | this->unattached_section_list_.push_back(os); | |
1072 | else | |
1073 | this->attach_allocated_section_to_segment(os); | |
1074 | } | |
1075 | ||
4e2b1697 | 1076 | // Attach an allocated output section to a segment. |
1c4f3631 | 1077 | |
4e2b1697 | 1078 | void |
154e0e9a | 1079 | Layout::attach_allocated_section_to_segment(Output_section* os) |
4e2b1697 | 1080 | { |
154e0e9a | 1081 | elfcpp::Elf_Xword flags = os->flags(); |
4e2b1697 | 1082 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
a2fb1b05 | 1083 | |
4e2b1697 ILT |
1084 | if (parameters->options().relocatable()) |
1085 | return; | |
a2fb1b05 | 1086 | |
4e2b1697 ILT |
1087 | // If we have a SECTIONS clause, we can't handle the attachment to |
1088 | // segments until after we've seen all the sections. | |
1089 | if (this->script_options_->saw_sections_clause()) | |
1090 | return; | |
a2fb1b05 | 1091 | |
4e2b1697 | 1092 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
756ac4a8 | 1093 | |
4e2b1697 | 1094 | // This output section goes into a PT_LOAD segment. |
a2fb1b05 | 1095 | |
4e2b1697 | 1096 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
a2fb1b05 | 1097 | |
a192ba05 ILT |
1098 | // Check for --section-start. |
1099 | uint64_t addr; | |
1100 | bool is_address_set = parameters->options().section_start(os->name(), &addr); | |
f5c870d2 | 1101 | |
4e2b1697 ILT |
1102 | // In general the only thing we really care about for PT_LOAD |
1103 | // segments is whether or not they are writable, so that is how we | |
8a5e3e08 ILT |
1104 | // search for them. Large data sections also go into their own |
1105 | // PT_LOAD segment. People who need segments sorted on some other | |
4e2b1697 | 1106 | // basis will have to use a linker script. |
a2fb1b05 | 1107 | |
4e2b1697 ILT |
1108 | Segment_list::const_iterator p; |
1109 | for (p = this->segment_list_.begin(); | |
1110 | p != this->segment_list_.end(); | |
1111 | ++p) | |
1112 | { | |
8a5e3e08 ILT |
1113 | if ((*p)->type() != elfcpp::PT_LOAD) |
1114 | continue; | |
1115 | if (!parameters->options().omagic() | |
1116 | && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W)) | |
1117 | continue; | |
1118 | // If -Tbss was specified, we need to separate the data and BSS | |
1119 | // segments. | |
1120 | if (parameters->options().user_set_Tbss()) | |
1121 | { | |
1122 | if ((os->type() == elfcpp::SHT_NOBITS) | |
1123 | == (*p)->has_any_data_sections()) | |
1124 | continue; | |
1125 | } | |
1126 | if (os->is_large_data_section() && !(*p)->is_large_data_segment()) | |
1127 | continue; | |
4e2b1697 | 1128 | |
a192ba05 ILT |
1129 | if (is_address_set) |
1130 | { | |
1131 | if ((*p)->are_addresses_set()) | |
1132 | continue; | |
1133 | ||
1134 | (*p)->add_initial_output_data(os); | |
1135 | (*p)->update_flags_for_output_section(seg_flags); | |
1136 | (*p)->set_addresses(addr, addr); | |
1137 | break; | |
1138 | } | |
1139 | ||
1140 | (*p)->add_output_section(os, seg_flags, true); | |
8a5e3e08 | 1141 | break; |
4e2b1697 | 1142 | } |
54dc6425 | 1143 | |
4e2b1697 ILT |
1144 | if (p == this->segment_list_.end()) |
1145 | { | |
1146 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, | |
1147 | seg_flags); | |
8a5e3e08 ILT |
1148 | if (os->is_large_data_section()) |
1149 | oseg->set_is_large_data_segment(); | |
a192ba05 ILT |
1150 | oseg->add_output_section(os, seg_flags, true); |
1151 | if (is_address_set) | |
1152 | oseg->set_addresses(addr, addr); | |
a2fb1b05 ILT |
1153 | } |
1154 | ||
4e2b1697 ILT |
1155 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
1156 | // segment. | |
1157 | if (os->type() == elfcpp::SHT_NOTE) | |
1158 | { | |
1159 | // See if we already have an equivalent PT_NOTE segment. | |
1160 | for (p = this->segment_list_.begin(); | |
1161 | p != segment_list_.end(); | |
1162 | ++p) | |
1163 | { | |
1164 | if ((*p)->type() == elfcpp::PT_NOTE | |
1165 | && (((*p)->flags() & elfcpp::PF_W) | |
1166 | == (seg_flags & elfcpp::PF_W))) | |
1167 | { | |
f5c870d2 | 1168 | (*p)->add_output_section(os, seg_flags, false); |
4e2b1697 ILT |
1169 | break; |
1170 | } | |
1171 | } | |
1172 | ||
1173 | if (p == this->segment_list_.end()) | |
1174 | { | |
1175 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, | |
1176 | seg_flags); | |
f5c870d2 | 1177 | oseg->add_output_section(os, seg_flags, false); |
4e2b1697 ILT |
1178 | } |
1179 | } | |
1180 | ||
1181 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
1182 | // segment. There can only be one such segment. | |
1183 | if ((flags & elfcpp::SHF_TLS) != 0) | |
1184 | { | |
1185 | if (this->tls_segment_ == NULL) | |
2d924fd9 | 1186 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
f5c870d2 | 1187 | this->tls_segment_->add_output_section(os, seg_flags, false); |
4e2b1697 | 1188 | } |
9f1d377b ILT |
1189 | |
1190 | // If -z relro is in effect, and we see a relro section, we create a | |
1191 | // PT_GNU_RELRO segment. There can only be one such segment. | |
1192 | if (os->is_relro() && parameters->options().relro()) | |
1193 | { | |
1194 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); | |
1195 | if (this->relro_segment_ == NULL) | |
2d924fd9 | 1196 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
f5c870d2 | 1197 | this->relro_segment_->add_output_section(os, seg_flags, false); |
9f1d377b | 1198 | } |
a2fb1b05 ILT |
1199 | } |
1200 | ||
919ed24c ILT |
1201 | // Make an output section for a script. |
1202 | ||
1203 | Output_section* | |
1e5d2fb1 DK |
1204 | Layout::make_output_section_for_script( |
1205 | const char* name, | |
1206 | Script_sections::Section_type section_type) | |
919ed24c ILT |
1207 | { |
1208 | name = this->namepool_.add(name, false, NULL); | |
1e5d2fb1 DK |
1209 | elfcpp::Elf_Xword sh_flags = elfcpp::SHF_ALLOC; |
1210 | if (section_type == Script_sections::ST_NOLOAD) | |
1211 | sh_flags = 0; | |
919ed24c | 1212 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, |
1e5d2fb1 | 1213 | sh_flags, false, |
1a2dff53 | 1214 | false, false, false, false); |
919ed24c | 1215 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
1216 | if (section_type == Script_sections::ST_NOLOAD) |
1217 | os->set_is_noload(); | |
919ed24c ILT |
1218 | return os; |
1219 | } | |
1220 | ||
3802b2dd ILT |
1221 | // Return the number of segments we expect to see. |
1222 | ||
1223 | size_t | |
1224 | Layout::expected_segment_count() const | |
1225 | { | |
1226 | size_t ret = this->segment_list_.size(); | |
1227 | ||
1228 | // If we didn't see a SECTIONS clause in a linker script, we should | |
1229 | // already have the complete list of segments. Otherwise we ask the | |
1230 | // SECTIONS clause how many segments it expects, and add in the ones | |
1231 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) | |
1232 | ||
1233 | if (!this->script_options_->saw_sections_clause()) | |
1234 | return ret; | |
1235 | else | |
1236 | { | |
1237 | const Script_sections* ss = this->script_options_->script_sections(); | |
1238 | return ret + ss->expected_segment_count(this); | |
1239 | } | |
1240 | } | |
1241 | ||
35cdfc9a ILT |
1242 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
1243 | // is whether we saw a .note.GNU-stack section in the object file. | |
1244 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
1245 | // protection required for stack memory. We record this in an | |
1246 | // executable as a PT_GNU_STACK segment. If an object file does not | |
1247 | // have a .note.GNU-stack segment, we must assume that it is an old | |
1248 | // object. On some targets that will force an executable stack. | |
1249 | ||
1250 | void | |
1251 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags) | |
1252 | { | |
1253 | if (!seen_gnu_stack) | |
1254 | this->input_without_gnu_stack_note_ = true; | |
1255 | else | |
1256 | { | |
1257 | this->input_with_gnu_stack_note_ = true; | |
1258 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
1259 | this->input_requires_executable_stack_ = true; | |
1260 | } | |
1261 | } | |
1262 | ||
9c547ec3 ILT |
1263 | // Create automatic note sections. |
1264 | ||
1265 | void | |
1266 | Layout::create_notes() | |
1267 | { | |
1268 | this->create_gold_note(); | |
1269 | this->create_executable_stack_info(); | |
1270 | this->create_build_id(); | |
1271 | } | |
1272 | ||
a3ad94ed ILT |
1273 | // Create the dynamic sections which are needed before we read the |
1274 | // relocs. | |
1275 | ||
1276 | void | |
9b07f471 | 1277 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
a3ad94ed | 1278 | { |
436ca963 | 1279 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
1280 | return; |
1281 | ||
3802b2dd ILT |
1282 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
1283 | elfcpp::SHT_DYNAMIC, | |
1284 | (elfcpp::SHF_ALLOC | |
1285 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
1286 | false, false, true, |
1287 | true, false, false); | |
a3ad94ed | 1288 | |
f0ba79e2 ILT |
1289 | this->dynamic_symbol_ = |
1290 | symtab->define_in_output_data("_DYNAMIC", NULL, Symbol_table::PREDEFINED, | |
1291 | this->dynamic_section_, 0, 0, | |
1292 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, | |
1293 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 1294 | |
9025d29d | 1295 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 ILT |
1296 | |
1297 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); | |
a3ad94ed ILT |
1298 | } |
1299 | ||
bfd58944 ILT |
1300 | // For each output section whose name can be represented as C symbol, |
1301 | // define __start and __stop symbols for the section. This is a GNU | |
1302 | // extension. | |
1303 | ||
1304 | void | |
9b07f471 | 1305 | Layout::define_section_symbols(Symbol_table* symtab) |
bfd58944 ILT |
1306 | { |
1307 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1308 | p != this->section_list_.end(); | |
1309 | ++p) | |
1310 | { | |
1311 | const char* const name = (*p)->name(); | |
f1ec9ded | 1312 | if (is_cident(name)) |
bfd58944 ILT |
1313 | { |
1314 | const std::string name_string(name); | |
f1ec9ded ST |
1315 | const std::string start_name(cident_section_start_prefix |
1316 | + name_string); | |
1317 | const std::string stop_name(cident_section_stop_prefix | |
1318 | + name_string); | |
bfd58944 | 1319 | |
9b07f471 | 1320 | symtab->define_in_output_data(start_name.c_str(), |
bfd58944 | 1321 | NULL, // version |
99fff23b | 1322 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
1323 | *p, |
1324 | 0, // value | |
1325 | 0, // symsize | |
1326 | elfcpp::STT_NOTYPE, | |
1327 | elfcpp::STB_GLOBAL, | |
1328 | elfcpp::STV_DEFAULT, | |
1329 | 0, // nonvis | |
1330 | false, // offset_is_from_end | |
a445fddf | 1331 | true); // only_if_ref |
bfd58944 | 1332 | |
9b07f471 | 1333 | symtab->define_in_output_data(stop_name.c_str(), |
bfd58944 | 1334 | NULL, // version |
99fff23b | 1335 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
1336 | *p, |
1337 | 0, // value | |
1338 | 0, // symsize | |
1339 | elfcpp::STT_NOTYPE, | |
1340 | elfcpp::STB_GLOBAL, | |
1341 | elfcpp::STV_DEFAULT, | |
1342 | 0, // nonvis | |
1343 | true, // offset_is_from_end | |
a445fddf | 1344 | true); // only_if_ref |
bfd58944 ILT |
1345 | } |
1346 | } | |
1347 | } | |
1348 | ||
755ab8af ILT |
1349 | // Define symbols for group signatures. |
1350 | ||
1351 | void | |
1352 | Layout::define_group_signatures(Symbol_table* symtab) | |
1353 | { | |
1354 | for (Group_signatures::iterator p = this->group_signatures_.begin(); | |
1355 | p != this->group_signatures_.end(); | |
1356 | ++p) | |
1357 | { | |
1358 | Symbol* sym = symtab->lookup(p->signature, NULL); | |
1359 | if (sym != NULL) | |
1360 | p->section->set_info_symndx(sym); | |
1361 | else | |
1362 | { | |
1363 | // Force the name of the group section to the group | |
1364 | // signature, and use the group's section symbol as the | |
1365 | // signature symbol. | |
1366 | if (strcmp(p->section->name(), p->signature) != 0) | |
1367 | { | |
1368 | const char* name = this->namepool_.add(p->signature, | |
1369 | true, NULL); | |
1370 | p->section->set_name(name); | |
1371 | } | |
1372 | p->section->set_needs_symtab_index(); | |
1373 | p->section->set_info_section_symndx(p->section); | |
1374 | } | |
1375 | } | |
1376 | ||
1377 | this->group_signatures_.clear(); | |
1378 | } | |
1379 | ||
75f65a3e ILT |
1380 | // Find the first read-only PT_LOAD segment, creating one if |
1381 | // necessary. | |
54dc6425 | 1382 | |
75f65a3e ILT |
1383 | Output_segment* |
1384 | Layout::find_first_load_seg() | |
54dc6425 | 1385 | { |
75f65a3e ILT |
1386 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
1387 | p != this->segment_list_.end(); | |
1388 | ++p) | |
1389 | { | |
1390 | if ((*p)->type() == elfcpp::PT_LOAD | |
1391 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
af6156ef ILT |
1392 | && (parameters->options().omagic() |
1393 | || ((*p)->flags() & elfcpp::PF_W) == 0)) | |
75f65a3e ILT |
1394 | return *p; |
1395 | } | |
1396 | ||
1c4f3631 ILT |
1397 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
1398 | ||
3802b2dd ILT |
1399 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
1400 | elfcpp::PF_R); | |
75f65a3e | 1401 | return load_seg; |
54dc6425 ILT |
1402 | } |
1403 | ||
20e6d0d6 DK |
1404 | // Save states of all current output segments. Store saved states |
1405 | // in SEGMENT_STATES. | |
1406 | ||
1407 | void | |
1408 | Layout::save_segments(Segment_states* segment_states) | |
1409 | { | |
1410 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
1411 | p != this->segment_list_.end(); | |
1412 | ++p) | |
1413 | { | |
1414 | Output_segment* segment = *p; | |
1415 | // Shallow copy. | |
1416 | Output_segment* copy = new Output_segment(*segment); | |
1417 | (*segment_states)[segment] = copy; | |
1418 | } | |
1419 | } | |
1420 | ||
1421 | // Restore states of output segments and delete any segment not found in | |
1422 | // SEGMENT_STATES. | |
1423 | ||
1424 | void | |
1425 | Layout::restore_segments(const Segment_states* segment_states) | |
1426 | { | |
1427 | // Go through the segment list and remove any segment added in the | |
1428 | // relaxation loop. | |
1429 | this->tls_segment_ = NULL; | |
1430 | this->relro_segment_ = NULL; | |
1431 | Segment_list::iterator list_iter = this->segment_list_.begin(); | |
1432 | while (list_iter != this->segment_list_.end()) | |
1433 | { | |
1434 | Output_segment* segment = *list_iter; | |
1435 | Segment_states::const_iterator states_iter = | |
1436 | segment_states->find(segment); | |
1437 | if (states_iter != segment_states->end()) | |
1438 | { | |
1439 | const Output_segment* copy = states_iter->second; | |
1440 | // Shallow copy to restore states. | |
1441 | *segment = *copy; | |
1442 | ||
1443 | // Also fix up TLS and RELRO segment pointers as appropriate. | |
1444 | if (segment->type() == elfcpp::PT_TLS) | |
1445 | this->tls_segment_ = segment; | |
1446 | else if (segment->type() == elfcpp::PT_GNU_RELRO) | |
1447 | this->relro_segment_ = segment; | |
1448 | ||
1449 | ++list_iter; | |
1450 | } | |
1451 | else | |
1452 | { | |
1453 | list_iter = this->segment_list_.erase(list_iter); | |
1454 | // This is a segment created during section layout. It should be | |
1455 | // safe to remove it since we should have removed all pointers to it. | |
1456 | delete segment; | |
1457 | } | |
1458 | } | |
1459 | } | |
1460 | ||
1461 | // Clean up after relaxation so that sections can be laid out again. | |
1462 | ||
1463 | void | |
1464 | Layout::clean_up_after_relaxation() | |
1465 | { | |
1466 | // Restore the segments to point state just prior to the relaxation loop. | |
1467 | Script_sections* script_section = this->script_options_->script_sections(); | |
1468 | script_section->release_segments(); | |
1469 | this->restore_segments(this->segment_states_); | |
1470 | ||
1471 | // Reset section addresses and file offsets | |
1472 | for (Section_list::iterator p = this->section_list_.begin(); | |
1473 | p != this->section_list_.end(); | |
1474 | ++p) | |
1475 | { | |
20e6d0d6 | 1476 | (*p)->restore_states(); |
8923b24c DK |
1477 | |
1478 | // If an input section changes size because of relaxation, | |
1479 | // we need to adjust the section offsets of all input sections. | |
1480 | // after such a section. | |
1481 | if ((*p)->section_offsets_need_adjustment()) | |
1482 | (*p)->adjust_section_offsets(); | |
1483 | ||
1484 | (*p)->reset_address_and_file_offset(); | |
20e6d0d6 DK |
1485 | } |
1486 | ||
1487 | // Reset special output object address and file offsets. | |
1488 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
1489 | p != this->special_output_list_.end(); | |
1490 | ++p) | |
1491 | (*p)->reset_address_and_file_offset(); | |
1492 | ||
1493 | // A linker script may have created some output section data objects. | |
1494 | // They are useless now. | |
1495 | for (Output_section_data_list::const_iterator p = | |
1496 | this->script_output_section_data_list_.begin(); | |
1497 | p != this->script_output_section_data_list_.end(); | |
1498 | ++p) | |
1499 | delete *p; | |
1500 | this->script_output_section_data_list_.clear(); | |
1501 | } | |
1502 | ||
1503 | // Prepare for relaxation. | |
1504 | ||
1505 | void | |
1506 | Layout::prepare_for_relaxation() | |
1507 | { | |
1508 | // Create an relaxation debug check if in debugging mode. | |
1509 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
1510 | this->relaxation_debug_check_ = new Relaxation_debug_check(); | |
1511 | ||
1512 | // Save segment states. | |
1513 | this->segment_states_ = new Segment_states(); | |
1514 | this->save_segments(this->segment_states_); | |
1515 | ||
1516 | for(Section_list::const_iterator p = this->section_list_.begin(); | |
1517 | p != this->section_list_.end(); | |
1518 | ++p) | |
1519 | (*p)->save_states(); | |
1520 | ||
1521 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
1522 | this->relaxation_debug_check_->check_output_data_for_reset_values( | |
1523 | this->section_list_, this->special_output_list_); | |
1524 | ||
1525 | // Also enable recording of output section data from scripts. | |
1526 | this->record_output_section_data_from_script_ = true; | |
1527 | } | |
1528 | ||
1529 | // Relaxation loop body: If target has no relaxation, this runs only once | |
1530 | // Otherwise, the target relaxation hook is called at the end of | |
1531 | // each iteration. If the hook returns true, it means re-layout of | |
1532 | // section is required. | |
1533 | // | |
1534 | // The number of segments created by a linking script without a PHDRS | |
1535 | // clause may be affected by section sizes and alignments. There is | |
1536 | // a remote chance that relaxation causes different number of PT_LOAD | |
1537 | // segments are created and sections are attached to different segments. | |
1538 | // Therefore, we always throw away all segments created during section | |
1539 | // layout. In order to be able to restart the section layout, we keep | |
1540 | // a copy of the segment list right before the relaxation loop and use | |
1541 | // that to restore the segments. | |
1542 | // | |
1543 | // PASS is the current relaxation pass number. | |
1544 | // SYMTAB is a symbol table. | |
1545 | // PLOAD_SEG is the address of a pointer for the load segment. | |
1546 | // PHDR_SEG is a pointer to the PHDR segment. | |
1547 | // SEGMENT_HEADERS points to the output segment header. | |
1548 | // FILE_HEADER points to the output file header. | |
1549 | // PSHNDX is the address to store the output section index. | |
1550 | ||
1551 | off_t inline | |
1552 | Layout::relaxation_loop_body( | |
1553 | int pass, | |
1554 | Target* target, | |
1555 | Symbol_table* symtab, | |
1556 | Output_segment** pload_seg, | |
1557 | Output_segment* phdr_seg, | |
1558 | Output_segment_headers* segment_headers, | |
1559 | Output_file_header* file_header, | |
1560 | unsigned int* pshndx) | |
1561 | { | |
1562 | // If this is not the first iteration, we need to clean up after | |
1563 | // relaxation so that we can lay out the sections again. | |
1564 | if (pass != 0) | |
1565 | this->clean_up_after_relaxation(); | |
1566 | ||
1567 | // If there is a SECTIONS clause, put all the input sections into | |
1568 | // the required order. | |
1569 | Output_segment* load_seg; | |
1570 | if (this->script_options_->saw_sections_clause()) | |
1571 | load_seg = this->set_section_addresses_from_script(symtab); | |
1572 | else if (parameters->options().relocatable()) | |
1573 | load_seg = NULL; | |
1574 | else | |
1575 | load_seg = this->find_first_load_seg(); | |
1576 | ||
1577 | if (parameters->options().oformat_enum() | |
1578 | != General_options::OBJECT_FORMAT_ELF) | |
1579 | load_seg = NULL; | |
1580 | ||
403a15dd ILT |
1581 | // If the user set the address of the text segment, that may not be |
1582 | // compatible with putting the segment headers and file headers into | |
1583 | // that segment. | |
1584 | if (parameters->options().user_set_Ttext()) | |
1585 | load_seg = NULL; | |
1586 | ||
68b6574b ILT |
1587 | gold_assert(phdr_seg == NULL |
1588 | || load_seg != NULL | |
1589 | || this->script_options_->saw_sections_clause()); | |
20e6d0d6 | 1590 | |
a192ba05 ILT |
1591 | // If the address of the load segment we found has been set by |
1592 | // --section-start rather than by a script, then we don't want to | |
1593 | // use it for the file and segment headers. | |
1594 | if (load_seg != NULL | |
1595 | && load_seg->are_addresses_set() | |
1596 | && !this->script_options_->saw_sections_clause()) | |
1597 | load_seg = NULL; | |
1598 | ||
20e6d0d6 DK |
1599 | // Lay out the segment headers. |
1600 | if (!parameters->options().relocatable()) | |
1601 | { | |
1602 | gold_assert(segment_headers != NULL); | |
1603 | if (load_seg != NULL) | |
1604 | load_seg->add_initial_output_data(segment_headers); | |
1605 | if (phdr_seg != NULL) | |
1606 | phdr_seg->add_initial_output_data(segment_headers); | |
1607 | } | |
1608 | ||
1609 | // Lay out the file header. | |
1610 | if (load_seg != NULL) | |
1611 | load_seg->add_initial_output_data(file_header); | |
1612 | ||
1613 | if (this->script_options_->saw_phdrs_clause() | |
1614 | && !parameters->options().relocatable()) | |
1615 | { | |
1616 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS | |
1617 | // clause in a linker script. | |
1618 | Script_sections* ss = this->script_options_->script_sections(); | |
1619 | ss->put_headers_in_phdrs(file_header, segment_headers); | |
1620 | } | |
1621 | ||
1622 | // We set the output section indexes in set_segment_offsets and | |
1623 | // set_section_indexes. | |
1624 | *pshndx = 1; | |
1625 | ||
1626 | // Set the file offsets of all the segments, and all the sections | |
1627 | // they contain. | |
1628 | off_t off; | |
1629 | if (!parameters->options().relocatable()) | |
1630 | off = this->set_segment_offsets(target, load_seg, pshndx); | |
1631 | else | |
1632 | off = this->set_relocatable_section_offsets(file_header, pshndx); | |
1633 | ||
1634 | // Verify that the dummy relaxation does not change anything. | |
1635 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
1636 | { | |
1637 | if (pass == 0) | |
1638 | this->relaxation_debug_check_->read_sections(this->section_list_); | |
1639 | else | |
1640 | this->relaxation_debug_check_->verify_sections(this->section_list_); | |
1641 | } | |
1642 | ||
1643 | *pload_seg = load_seg; | |
1644 | return off; | |
1645 | } | |
1646 | ||
6e9ba2ca ST |
1647 | // Search the list of patterns and find the postion of the given section |
1648 | // name in the output section. If the section name matches a glob | |
1649 | // pattern and a non-glob name, then the non-glob position takes | |
1650 | // precedence. Return 0 if no match is found. | |
1651 | ||
1652 | unsigned int | |
1653 | Layout::find_section_order_index(const std::string& section_name) | |
1654 | { | |
1655 | Unordered_map<std::string, unsigned int>::iterator map_it; | |
1656 | map_it = this->input_section_position_.find(section_name); | |
1657 | if (map_it != this->input_section_position_.end()) | |
1658 | return map_it->second; | |
1659 | ||
1660 | // Absolute match failed. Linear search the glob patterns. | |
1661 | std::vector<std::string>::iterator it; | |
1662 | for (it = this->input_section_glob_.begin(); | |
1663 | it != this->input_section_glob_.end(); | |
1664 | ++it) | |
1665 | { | |
1666 | if (fnmatch((*it).c_str(), section_name.c_str(), FNM_NOESCAPE) == 0) | |
1667 | { | |
1668 | map_it = this->input_section_position_.find(*it); | |
1669 | gold_assert(map_it != this->input_section_position_.end()); | |
1670 | return map_it->second; | |
1671 | } | |
1672 | } | |
1673 | return 0; | |
1674 | } | |
1675 | ||
1676 | // Read the sequence of input sections from the file specified with | |
1677 | // --section-ordering-file. | |
1678 | ||
1679 | void | |
1680 | Layout::read_layout_from_file() | |
1681 | { | |
1682 | const char* filename = parameters->options().section_ordering_file(); | |
1683 | std::ifstream in; | |
1684 | std::string line; | |
1685 | ||
1686 | in.open(filename); | |
1687 | if (!in) | |
1688 | gold_fatal(_("unable to open --section-ordering-file file %s: %s"), | |
1689 | filename, strerror(errno)); | |
1690 | ||
1691 | std::getline(in, line); // this chops off the trailing \n, if any | |
1692 | unsigned int position = 1; | |
1693 | ||
1694 | while (in) | |
1695 | { | |
1696 | if (!line.empty() && line[line.length() - 1] == '\r') // Windows | |
1697 | line.resize(line.length() - 1); | |
1698 | // Ignore comments, beginning with '#' | |
1699 | if (line[0] == '#') | |
1700 | { | |
1701 | std::getline(in, line); | |
1702 | continue; | |
1703 | } | |
1704 | this->input_section_position_[line] = position; | |
1705 | // Store all glob patterns in a vector. | |
1706 | if (is_wildcard_string(line.c_str())) | |
1707 | this->input_section_glob_.push_back(line); | |
1708 | position++; | |
1709 | std::getline(in, line); | |
1710 | } | |
1711 | } | |
1712 | ||
54dc6425 ILT |
1713 | // Finalize the layout. When this is called, we have created all the |
1714 | // output sections and all the output segments which are based on | |
1715 | // input sections. We have several things to do, and we have to do | |
1716 | // them in the right order, so that we get the right results correctly | |
1717 | // and efficiently. | |
1718 | ||
1719 | // 1) Finalize the list of output segments and create the segment | |
1720 | // table header. | |
1721 | ||
1722 | // 2) Finalize the dynamic symbol table and associated sections. | |
1723 | ||
1724 | // 3) Determine the final file offset of all the output segments. | |
1725 | ||
1726 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
1727 | // sections. | |
1728 | ||
75f65a3e ILT |
1729 | // 5) Create the symbol table sections and the section name table |
1730 | // section. | |
1731 | ||
1732 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
1733 | // value and make a final determination of which symbols are going |
1734 | // into the output symbol table. | |
1735 | ||
54dc6425 ILT |
1736 | // 7) Create the section table header. |
1737 | ||
1738 | // 8) Determine the final file offset of all the output sections which | |
1739 | // are not SHF_ALLOC, including the section table header. | |
1740 | ||
1741 | // 9) Finalize the ELF file header. | |
1742 | ||
75f65a3e ILT |
1743 | // This function returns the size of the output file. |
1744 | ||
1745 | off_t | |
17a1d0a9 | 1746 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
8851ecca | 1747 | Target* target, const Task* task) |
54dc6425 | 1748 | { |
f59f41f3 | 1749 | target->finalize_sections(this, input_objects, symtab); |
5a6f7e2d | 1750 | |
17a1d0a9 | 1751 | this->count_local_symbols(task, input_objects); |
7bf1f802 | 1752 | |
1518dc8f | 1753 | this->link_stabs_sections(); |
4f211c8b | 1754 | |
3802b2dd | 1755 | Output_segment* phdr_seg = NULL; |
8851ecca | 1756 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
54dc6425 | 1757 | { |
dbe717ef ILT |
1758 | // There was a dynamic object in the link. We need to create |
1759 | // some information for the dynamic linker. | |
1760 | ||
3802b2dd ILT |
1761 | // Create the PT_PHDR segment which will hold the program |
1762 | // headers. | |
1c4f3631 ILT |
1763 | if (!this->script_options_->saw_phdrs_clause()) |
1764 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
3802b2dd | 1765 | |
14b31740 ILT |
1766 | // Create the dynamic symbol table, including the hash table. |
1767 | Output_section* dynstr; | |
1768 | std::vector<Symbol*> dynamic_symbols; | |
1769 | unsigned int local_dynamic_count; | |
a5dc0706 ILT |
1770 | Versions versions(*this->script_options()->version_script_info(), |
1771 | &this->dynpool_); | |
9b07f471 | 1772 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
14b31740 ILT |
1773 | &local_dynamic_count, &dynamic_symbols, |
1774 | &versions); | |
dbe717ef ILT |
1775 | |
1776 | // Create the .interp section to hold the name of the | |
1777 | // interpreter, and put it in a PT_INTERP segment. | |
8851ecca | 1778 | if (!parameters->options().shared()) |
96f2030e | 1779 | this->create_interp(target); |
a3ad94ed ILT |
1780 | |
1781 | // Finish the .dynamic section to hold the dynamic data, and put | |
1782 | // it in a PT_DYNAMIC segment. | |
16649710 | 1783 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
1784 | |
1785 | // We should have added everything we need to the dynamic string | |
1786 | // table. | |
1787 | this->dynpool_.set_string_offsets(); | |
1788 | ||
1789 | // Create the version sections. We can't do this until the | |
1790 | // dynamic string table is complete. | |
46fe1623 | 1791 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
14b31740 | 1792 | dynamic_symbols, dynstr); |
f0ba79e2 ILT |
1793 | |
1794 | // Set the size of the _DYNAMIC symbol. We can't do this until | |
1795 | // after we call create_version_sections. | |
1796 | this->set_dynamic_symbol_size(symtab); | |
54dc6425 | 1797 | } |
3ce2c28e ILT |
1798 | |
1799 | if (this->incremental_inputs_) | |
1800 | { | |
1801 | this->incremental_inputs_->finalize(); | |
1802 | this->create_incremental_info_sections(); | |
1803 | } | |
54dc6425 | 1804 | |
20e6d0d6 DK |
1805 | // Create segment headers. |
1806 | Output_segment_headers* segment_headers = | |
1807 | (parameters->options().relocatable() | |
1808 | ? NULL | |
1809 | : new Output_segment_headers(this->segment_list_)); | |
75f65a3e ILT |
1810 | |
1811 | // Lay out the file header. | |
20e6d0d6 DK |
1812 | Output_file_header* file_header |
1813 | = new Output_file_header(target, symtab, segment_headers, | |
1814 | parameters->options().entry()); | |
a445fddf | 1815 | |
61ba1cf9 | 1816 | this->special_output_list_.push_back(file_header); |
6a74a719 ILT |
1817 | if (segment_headers != NULL) |
1818 | this->special_output_list_.push_back(segment_headers); | |
75f65a3e | 1819 | |
20e6d0d6 DK |
1820 | // Find approriate places for orphan output sections if we are using |
1821 | // a linker script. | |
1822 | if (this->script_options_->saw_sections_clause()) | |
1823 | this->place_orphan_sections_in_script(); | |
1824 | ||
1825 | Output_segment* load_seg; | |
1826 | off_t off; | |
1827 | unsigned int shndx; | |
1828 | int pass = 0; | |
1829 | ||
1830 | // Take a snapshot of the section layout as needed. | |
1831 | if (target->may_relax()) | |
1832 | this->prepare_for_relaxation(); | |
1833 | ||
1834 | // Run the relaxation loop to lay out sections. | |
1835 | do | |
1c4f3631 | 1836 | { |
20e6d0d6 DK |
1837 | off = this->relaxation_loop_body(pass, target, symtab, &load_seg, |
1838 | phdr_seg, segment_headers, file_header, | |
1839 | &shndx); | |
1840 | pass++; | |
1c4f3631 | 1841 | } |
c0a62865 DK |
1842 | while (target->may_relax() |
1843 | && target->relax(pass, input_objects, symtab, this)); | |
75f65a3e | 1844 | |
a9a60db6 ILT |
1845 | // Set the file offsets of all the non-data sections we've seen so |
1846 | // far which don't have to wait for the input sections. We need | |
1847 | // this in order to finalize local symbols in non-allocated | |
1848 | // sections. | |
1849 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); | |
1850 | ||
d491d34e ILT |
1851 | // Set the section indexes of all unallocated sections seen so far, |
1852 | // in case any of them are somehow referenced by a symbol. | |
1853 | shndx = this->set_section_indexes(shndx); | |
1854 | ||
75f65a3e | 1855 | // Create the symbol table sections. |
d491d34e | 1856 | this->create_symtab_sections(input_objects, symtab, shndx, &off); |
7bf1f802 ILT |
1857 | if (!parameters->doing_static_link()) |
1858 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e | 1859 | |
e5756efb ILT |
1860 | // Process any symbol assignments from a linker script. This must |
1861 | // be called after the symbol table has been finalized. | |
1862 | this->script_options_->finalize_symbols(symtab, this); | |
1863 | ||
75f65a3e ILT |
1864 | // Create the .shstrtab section. |
1865 | Output_section* shstrtab_section = this->create_shstrtab(); | |
1866 | ||
a9a60db6 ILT |
1867 | // Set the file offsets of the rest of the non-data sections which |
1868 | // don't have to wait for the input sections. | |
9a0910c3 | 1869 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 | 1870 | |
d491d34e ILT |
1871 | // Now that all sections have been created, set the section indexes |
1872 | // for any sections which haven't been done yet. | |
86887060 | 1873 | shndx = this->set_section_indexes(shndx); |
ead1e424 | 1874 | |
75f65a3e | 1875 | // Create the section table header. |
d491d34e | 1876 | this->create_shdrs(shstrtab_section, &off); |
75f65a3e | 1877 | |
17a1d0a9 ILT |
1878 | // If there are no sections which require postprocessing, we can |
1879 | // handle the section names now, and avoid a resize later. | |
1880 | if (!this->any_postprocessing_sections_) | |
1881 | off = this->set_section_offsets(off, | |
1882 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
1883 | ||
27bc2bce | 1884 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 1885 | |
27bc2bce ILT |
1886 | // Now we know exactly where everything goes in the output file |
1887 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 1888 | Output_data::layout_complete(); |
75f65a3e | 1889 | |
e44fcf3b ILT |
1890 | this->output_file_size_ = off; |
1891 | ||
75f65a3e ILT |
1892 | return off; |
1893 | } | |
1894 | ||
8ed814a9 | 1895 | // Create a note header following the format defined in the ELF ABI. |
ec3f783e ILT |
1896 | // NAME is the name, NOTE_TYPE is the type, SECTION_NAME is the name |
1897 | // of the section to create, DESCSZ is the size of the descriptor. | |
1898 | // ALLOCATE is true if the section should be allocated in memory. | |
1899 | // This returns the new note section. It sets *TRAILING_PADDING to | |
1900 | // the number of trailing zero bytes required. | |
4f211c8b | 1901 | |
8ed814a9 | 1902 | Output_section* |
ef4ab7a8 PP |
1903 | Layout::create_note(const char* name, int note_type, |
1904 | const char* section_name, size_t descsz, | |
8ed814a9 | 1905 | bool allocate, size_t* trailing_padding) |
4f211c8b | 1906 | { |
e2305dc0 ILT |
1907 | // Authorities all agree that the values in a .note field should |
1908 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
1909 | // they differ on what the alignment is for 64-bit binaries. | |
1910 | // The GABI says unambiguously they take 8-byte alignment: | |
1911 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
1912 | // Other documentation says alignment should always be 4 bytes: | |
1913 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
1914 | // GNU ld and GNU readelf both support the latter (at least as of | |
1915 | // version 2.16.91), and glibc always generates the latter for | |
1916 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
1917 | // here. | |
35cdfc9a | 1918 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
8851ecca | 1919 | const int size = parameters->target().get_size(); |
e2305dc0 ILT |
1920 | #else |
1921 | const int size = 32; | |
1922 | #endif | |
4f211c8b ILT |
1923 | |
1924 | // The contents of the .note section. | |
4f211c8b ILT |
1925 | size_t namesz = strlen(name) + 1; |
1926 | size_t aligned_namesz = align_address(namesz, size / 8); | |
4f211c8b | 1927 | size_t aligned_descsz = align_address(descsz, size / 8); |
4f211c8b | 1928 | |
8ed814a9 | 1929 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
4f211c8b | 1930 | |
8ed814a9 ILT |
1931 | unsigned char* buffer = new unsigned char[notehdrsz]; |
1932 | memset(buffer, 0, notehdrsz); | |
4f211c8b | 1933 | |
8851ecca | 1934 | bool is_big_endian = parameters->target().is_big_endian(); |
4f211c8b ILT |
1935 | |
1936 | if (size == 32) | |
1937 | { | |
1938 | if (!is_big_endian) | |
1939 | { | |
1940 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
1941 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
1942 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
1943 | } | |
1944 | else | |
1945 | { | |
1946 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
1947 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
1948 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
1949 | } | |
1950 | } | |
1951 | else if (size == 64) | |
1952 | { | |
1953 | if (!is_big_endian) | |
1954 | { | |
1955 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
1956 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
1957 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
1958 | } | |
1959 | else | |
1960 | { | |
1961 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
1962 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
1963 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
1964 | } | |
1965 | } | |
1966 | else | |
1967 | gold_unreachable(); | |
1968 | ||
1969 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
4f211c8b | 1970 | |
8ed814a9 ILT |
1971 | elfcpp::Elf_Xword flags = 0; |
1972 | if (allocate) | |
1973 | flags = elfcpp::SHF_ALLOC; | |
ec3f783e ILT |
1974 | Output_section* os = this->choose_output_section(NULL, section_name, |
1975 | elfcpp::SHT_NOTE, | |
f5c870d2 | 1976 | flags, false, false, |
1a2dff53 | 1977 | false, false, false, false); |
9c547ec3 ILT |
1978 | if (os == NULL) |
1979 | return NULL; | |
1980 | ||
8ed814a9 | 1981 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, |
7d9e3d98 ILT |
1982 | size / 8, |
1983 | "** note header"); | |
8ed814a9 ILT |
1984 | os->add_output_section_data(posd); |
1985 | ||
1986 | *trailing_padding = aligned_descsz - descsz; | |
1987 | ||
1988 | return os; | |
1989 | } | |
1990 | ||
1991 | // For an executable or shared library, create a note to record the | |
1992 | // version of gold used to create the binary. | |
1993 | ||
1994 | void | |
1995 | Layout::create_gold_note() | |
1996 | { | |
1997 | if (parameters->options().relocatable()) | |
1998 | return; | |
1999 | ||
2000 | std::string desc = std::string("gold ") + gold::get_version_string(); | |
2001 | ||
2002 | size_t trailing_padding; | |
2003 | Output_section *os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, | |
ef4ab7a8 PP |
2004 | ".note.gnu.gold-version", desc.size(), |
2005 | false, &trailing_padding); | |
9c547ec3 ILT |
2006 | if (os == NULL) |
2007 | return; | |
8ed814a9 ILT |
2008 | |
2009 | Output_section_data* posd = new Output_data_const(desc, 4); | |
4f211c8b | 2010 | os->add_output_section_data(posd); |
8ed814a9 ILT |
2011 | |
2012 | if (trailing_padding > 0) | |
2013 | { | |
7d9e3d98 | 2014 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
2015 | os->add_output_section_data(posd); |
2016 | } | |
4f211c8b ILT |
2017 | } |
2018 | ||
35cdfc9a ILT |
2019 | // Record whether the stack should be executable. This can be set |
2020 | // from the command line using the -z execstack or -z noexecstack | |
2021 | // options. Otherwise, if any input file has a .note.GNU-stack | |
2022 | // section with the SHF_EXECINSTR flag set, the stack should be | |
2023 | // executable. Otherwise, if at least one input file a | |
2024 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
2025 | // section, we use the target default for whether the stack should be | |
2026 | // executable. Otherwise, we don't generate a stack note. When | |
2027 | // generating a object file, we create a .note.GNU-stack section with | |
2028 | // the appropriate marking. When generating an executable or shared | |
2029 | // library, we create a PT_GNU_STACK segment. | |
2030 | ||
2031 | void | |
9c547ec3 | 2032 | Layout::create_executable_stack_info() |
35cdfc9a ILT |
2033 | { |
2034 | bool is_stack_executable; | |
e55bde5e ILT |
2035 | if (parameters->options().is_execstack_set()) |
2036 | is_stack_executable = parameters->options().is_stack_executable(); | |
35cdfc9a ILT |
2037 | else if (!this->input_with_gnu_stack_note_) |
2038 | return; | |
2039 | else | |
2040 | { | |
2041 | if (this->input_requires_executable_stack_) | |
2042 | is_stack_executable = true; | |
2043 | else if (this->input_without_gnu_stack_note_) | |
9c547ec3 ILT |
2044 | is_stack_executable = |
2045 | parameters->target().is_default_stack_executable(); | |
35cdfc9a ILT |
2046 | else |
2047 | is_stack_executable = false; | |
2048 | } | |
2049 | ||
8851ecca | 2050 | if (parameters->options().relocatable()) |
35cdfc9a ILT |
2051 | { |
2052 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
2053 | elfcpp::Elf_Xword flags = 0; | |
2054 | if (is_stack_executable) | |
2055 | flags |= elfcpp::SHF_EXECINSTR; | |
f5c870d2 | 2056 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags, false, |
1a2dff53 | 2057 | false, false, false, false); |
35cdfc9a ILT |
2058 | } |
2059 | else | |
2060 | { | |
1c4f3631 ILT |
2061 | if (this->script_options_->saw_phdrs_clause()) |
2062 | return; | |
35cdfc9a ILT |
2063 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
2064 | if (is_stack_executable) | |
2065 | flags |= elfcpp::PF_X; | |
3802b2dd | 2066 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); |
35cdfc9a ILT |
2067 | } |
2068 | } | |
2069 | ||
8ed814a9 ILT |
2070 | // If --build-id was used, set up the build ID note. |
2071 | ||
2072 | void | |
2073 | Layout::create_build_id() | |
2074 | { | |
2075 | if (!parameters->options().user_set_build_id()) | |
2076 | return; | |
2077 | ||
2078 | const char* style = parameters->options().build_id(); | |
2079 | if (strcmp(style, "none") == 0) | |
2080 | return; | |
2081 | ||
2082 | // Set DESCSZ to the size of the note descriptor. When possible, | |
2083 | // set DESC to the note descriptor contents. | |
2084 | size_t descsz; | |
2085 | std::string desc; | |
2086 | if (strcmp(style, "md5") == 0) | |
2087 | descsz = 128 / 8; | |
2088 | else if (strcmp(style, "sha1") == 0) | |
2089 | descsz = 160 / 8; | |
2090 | else if (strcmp(style, "uuid") == 0) | |
2091 | { | |
2092 | const size_t uuidsz = 128 / 8; | |
2093 | ||
2094 | char buffer[uuidsz]; | |
2095 | memset(buffer, 0, uuidsz); | |
2096 | ||
2a00e4fb | 2097 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
8ed814a9 ILT |
2098 | if (descriptor < 0) |
2099 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), | |
2100 | strerror(errno)); | |
2101 | else | |
2102 | { | |
2103 | ssize_t got = ::read(descriptor, buffer, uuidsz); | |
2a00e4fb | 2104 | release_descriptor(descriptor, true); |
8ed814a9 ILT |
2105 | if (got < 0) |
2106 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); | |
2107 | else if (static_cast<size_t>(got) != uuidsz) | |
2108 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), | |
2109 | uuidsz, got); | |
2110 | } | |
2111 | ||
2112 | desc.assign(buffer, uuidsz); | |
2113 | descsz = uuidsz; | |
2114 | } | |
2115 | else if (strncmp(style, "0x", 2) == 0) | |
2116 | { | |
2117 | hex_init(); | |
2118 | const char* p = style + 2; | |
2119 | while (*p != '\0') | |
2120 | { | |
2121 | if (hex_p(p[0]) && hex_p(p[1])) | |
2122 | { | |
2123 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); | |
2124 | desc += c; | |
2125 | p += 2; | |
2126 | } | |
2127 | else if (*p == '-' || *p == ':') | |
2128 | ++p; | |
2129 | else | |
2130 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), | |
2131 | style); | |
2132 | } | |
2133 | descsz = desc.size(); | |
2134 | } | |
2135 | else | |
2136 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); | |
2137 | ||
2138 | // Create the note. | |
2139 | size_t trailing_padding; | |
2140 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, | |
ef4ab7a8 PP |
2141 | ".note.gnu.build-id", descsz, true, |
2142 | &trailing_padding); | |
9c547ec3 ILT |
2143 | if (os == NULL) |
2144 | return; | |
8ed814a9 ILT |
2145 | |
2146 | if (!desc.empty()) | |
2147 | { | |
2148 | // We know the value already, so we fill it in now. | |
2149 | gold_assert(desc.size() == descsz); | |
2150 | ||
2151 | Output_section_data* posd = new Output_data_const(desc, 4); | |
2152 | os->add_output_section_data(posd); | |
2153 | ||
2154 | if (trailing_padding != 0) | |
2155 | { | |
7d9e3d98 | 2156 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
2157 | os->add_output_section_data(posd); |
2158 | } | |
2159 | } | |
2160 | else | |
2161 | { | |
2162 | // We need to compute a checksum after we have completed the | |
2163 | // link. | |
2164 | gold_assert(trailing_padding == 0); | |
7d9e3d98 | 2165 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
8ed814a9 | 2166 | os->add_output_section_data(this->build_id_note_); |
8ed814a9 ILT |
2167 | } |
2168 | } | |
2169 | ||
1518dc8f ILT |
2170 | // If we have both .stabXX and .stabXXstr sections, then the sh_link |
2171 | // field of the former should point to the latter. I'm not sure who | |
2172 | // started this, but the GNU linker does it, and some tools depend | |
2173 | // upon it. | |
2174 | ||
2175 | void | |
2176 | Layout::link_stabs_sections() | |
2177 | { | |
2178 | if (!this->have_stabstr_section_) | |
2179 | return; | |
2180 | ||
2181 | for (Section_list::iterator p = this->section_list_.begin(); | |
2182 | p != this->section_list_.end(); | |
2183 | ++p) | |
2184 | { | |
2185 | if ((*p)->type() != elfcpp::SHT_STRTAB) | |
2186 | continue; | |
2187 | ||
2188 | const char* name = (*p)->name(); | |
2189 | if (strncmp(name, ".stab", 5) != 0) | |
2190 | continue; | |
2191 | ||
2192 | size_t len = strlen(name); | |
2193 | if (strcmp(name + len - 3, "str") != 0) | |
2194 | continue; | |
2195 | ||
2196 | std::string stab_name(name, len - 3); | |
2197 | Output_section* stab_sec; | |
2198 | stab_sec = this->find_output_section(stab_name.c_str()); | |
2199 | if (stab_sec != NULL) | |
2200 | stab_sec->set_link_section(*p); | |
2201 | } | |
2202 | } | |
2203 | ||
3ce2c28e ILT |
2204 | // Create .gnu_incremental_inputs and .gnu_incremental_strtab sections needed |
2205 | // for the next run of incremental linking to check what has changed. | |
2206 | ||
2207 | void | |
2208 | Layout::create_incremental_info_sections() | |
2209 | { | |
2210 | gold_assert(this->incremental_inputs_ != NULL); | |
2211 | ||
2212 | // Add the .gnu_incremental_inputs section. | |
2213 | const char *incremental_inputs_name = | |
2214 | this->namepool_.add(".gnu_incremental_inputs", false, NULL); | |
2215 | Output_section* inputs_os = | |
2216 | this->make_output_section(incremental_inputs_name, | |
f5c870d2 | 2217 | elfcpp::SHT_GNU_INCREMENTAL_INPUTS, 0, |
1a2dff53 | 2218 | false, false, false, false, false); |
3ce2c28e ILT |
2219 | Output_section_data* posd = |
2220 | this->incremental_inputs_->create_incremental_inputs_section_data(); | |
2221 | inputs_os->add_output_section_data(posd); | |
2222 | ||
2223 | // Add the .gnu_incremental_strtab section. | |
2224 | const char *incremental_strtab_name = | |
2225 | this->namepool_.add(".gnu_incremental_strtab", false, NULL); | |
2226 | Output_section* strtab_os = this->make_output_section(incremental_strtab_name, | |
2227 | elfcpp::SHT_STRTAB, | |
1a2dff53 ILT |
2228 | 0, false, false, |
2229 | false, false, false); | |
3ce2c28e ILT |
2230 | Output_data_strtab* strtab_data = |
2231 | new Output_data_strtab(this->incremental_inputs_->get_stringpool()); | |
2232 | strtab_os->add_output_section_data(strtab_data); | |
2233 | ||
2234 | inputs_os->set_link_section(strtab_data); | |
2235 | } | |
2236 | ||
75f65a3e ILT |
2237 | // Return whether SEG1 should be before SEG2 in the output file. This |
2238 | // is based entirely on the segment type and flags. When this is | |
2239 | // called the segment addresses has normally not yet been set. | |
2240 | ||
2241 | bool | |
2242 | Layout::segment_precedes(const Output_segment* seg1, | |
2243 | const Output_segment* seg2) | |
2244 | { | |
2245 | elfcpp::Elf_Word type1 = seg1->type(); | |
2246 | elfcpp::Elf_Word type2 = seg2->type(); | |
2247 | ||
2248 | // The single PT_PHDR segment is required to precede any loadable | |
2249 | // segment. We simply make it always first. | |
2250 | if (type1 == elfcpp::PT_PHDR) | |
2251 | { | |
a3ad94ed | 2252 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
2253 | return true; |
2254 | } | |
2255 | if (type2 == elfcpp::PT_PHDR) | |
2256 | return false; | |
2257 | ||
2258 | // The single PT_INTERP segment is required to precede any loadable | |
2259 | // segment. We simply make it always second. | |
2260 | if (type1 == elfcpp::PT_INTERP) | |
2261 | { | |
a3ad94ed | 2262 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
2263 | return true; |
2264 | } | |
2265 | if (type2 == elfcpp::PT_INTERP) | |
2266 | return false; | |
2267 | ||
2268 | // We then put PT_LOAD segments before any other segments. | |
2269 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
2270 | return true; | |
2271 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
2272 | return false; | |
2273 | ||
9f1d377b ILT |
2274 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
2275 | // segment, because that is where the dynamic linker expects to find | |
2276 | // it (this is just for efficiency; other positions would also work | |
2277 | // correctly). | |
2278 | if (type1 == elfcpp::PT_TLS | |
2279 | && type2 != elfcpp::PT_TLS | |
2280 | && type2 != elfcpp::PT_GNU_RELRO) | |
2281 | return false; | |
2282 | if (type2 == elfcpp::PT_TLS | |
2283 | && type1 != elfcpp::PT_TLS | |
2284 | && type1 != elfcpp::PT_GNU_RELRO) | |
2285 | return true; | |
2286 | ||
2287 | // We put the PT_GNU_RELRO segment last, because that is where the | |
2288 | // dynamic linker expects to find it (as with PT_TLS, this is just | |
2289 | // for efficiency). | |
2290 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) | |
92e059d8 | 2291 | return false; |
9f1d377b | 2292 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
92e059d8 ILT |
2293 | return true; |
2294 | ||
75f65a3e ILT |
2295 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
2296 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
2297 | ||
2298 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
2299 | // by the numeric segment type and flags values. There should not | |
2300 | // be more than one segment with the same type and flags. | |
2301 | if (type1 != elfcpp::PT_LOAD) | |
2302 | { | |
2303 | if (type1 != type2) | |
2304 | return type1 < type2; | |
a3ad94ed | 2305 | gold_assert(flags1 != flags2); |
75f65a3e ILT |
2306 | return flags1 < flags2; |
2307 | } | |
2308 | ||
a445fddf ILT |
2309 | // If the addresses are set already, sort by load address. |
2310 | if (seg1->are_addresses_set()) | |
2311 | { | |
2312 | if (!seg2->are_addresses_set()) | |
2313 | return true; | |
2314 | ||
2315 | unsigned int section_count1 = seg1->output_section_count(); | |
2316 | unsigned int section_count2 = seg2->output_section_count(); | |
2317 | if (section_count1 == 0 && section_count2 > 0) | |
2318 | return true; | |
2319 | if (section_count1 > 0 && section_count2 == 0) | |
2320 | return false; | |
2321 | ||
2322 | uint64_t paddr1 = seg1->first_section_load_address(); | |
2323 | uint64_t paddr2 = seg2->first_section_load_address(); | |
2324 | if (paddr1 != paddr2) | |
2325 | return paddr1 < paddr2; | |
2326 | } | |
2327 | else if (seg2->are_addresses_set()) | |
2328 | return false; | |
2329 | ||
8a5e3e08 ILT |
2330 | // A segment which holds large data comes after a segment which does |
2331 | // not hold large data. | |
2332 | if (seg1->is_large_data_segment()) | |
2333 | { | |
2334 | if (!seg2->is_large_data_segment()) | |
2335 | return false; | |
2336 | } | |
2337 | else if (seg2->is_large_data_segment()) | |
2338 | return true; | |
2339 | ||
2340 | // Otherwise, we sort PT_LOAD segments based on the flags. Readonly | |
2341 | // segments come before writable segments. Then writable segments | |
2342 | // with data come before writable segments without data. Then | |
2343 | // executable segments come before non-executable segments. Then | |
2344 | // the unlikely case of a non-readable segment comes before the | |
2345 | // normal case of a readable segment. If there are multiple | |
2346 | // segments with the same type and flags, we require that the | |
2347 | // address be set, and we sort by virtual address and then physical | |
2348 | // address. | |
75f65a3e ILT |
2349 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
2350 | return (flags1 & elfcpp::PF_W) == 0; | |
756ac4a8 ILT |
2351 | if ((flags1 & elfcpp::PF_W) != 0 |
2352 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) | |
2353 | return seg1->has_any_data_sections(); | |
75f65a3e ILT |
2354 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
2355 | return (flags1 & elfcpp::PF_X) != 0; | |
2356 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
2357 | return (flags1 & elfcpp::PF_R) == 0; | |
2358 | ||
a445fddf ILT |
2359 | // We shouldn't get here--we shouldn't create segments which we |
2360 | // can't distinguish. | |
2361 | gold_unreachable(); | |
75f65a3e ILT |
2362 | } |
2363 | ||
8a5e3e08 ILT |
2364 | // Increase OFF so that it is congruent to ADDR modulo ABI_PAGESIZE. |
2365 | ||
2366 | static off_t | |
2367 | align_file_offset(off_t off, uint64_t addr, uint64_t abi_pagesize) | |
2368 | { | |
2369 | uint64_t unsigned_off = off; | |
2370 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) | |
2371 | | (addr & (abi_pagesize - 1))); | |
2372 | if (aligned_off < unsigned_off) | |
2373 | aligned_off += abi_pagesize; | |
2374 | return aligned_off; | |
2375 | } | |
2376 | ||
ead1e424 ILT |
2377 | // Set the file offsets of all the segments, and all the sections they |
2378 | // contain. They have all been created. LOAD_SEG must be be laid out | |
2379 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
2380 | |
2381 | off_t | |
ead1e424 ILT |
2382 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
2383 | unsigned int *pshndx) | |
75f65a3e ILT |
2384 | { |
2385 | // Sort them into the final order. | |
54dc6425 ILT |
2386 | std::sort(this->segment_list_.begin(), this->segment_list_.end(), |
2387 | Layout::Compare_segments()); | |
2388 | ||
75f65a3e ILT |
2389 | // Find the PT_LOAD segments, and set their addresses and offsets |
2390 | // and their section's addresses and offsets. | |
0c5e9c22 | 2391 | uint64_t addr; |
e55bde5e ILT |
2392 | if (parameters->options().user_set_Ttext()) |
2393 | addr = parameters->options().Ttext(); | |
374ad285 | 2394 | else if (parameters->options().output_is_position_independent()) |
a445fddf | 2395 | addr = 0; |
0c5e9c22 ILT |
2396 | else |
2397 | addr = target->default_text_segment_address(); | |
75f65a3e | 2398 | off_t off = 0; |
a445fddf ILT |
2399 | |
2400 | // If LOAD_SEG is NULL, then the file header and segment headers | |
2401 | // will not be loadable. But they still need to be at offset 0 in | |
2402 | // the file. Set their offsets now. | |
2403 | if (load_seg == NULL) | |
2404 | { | |
2405 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
2406 | p != this->special_output_list_.end(); | |
2407 | ++p) | |
2408 | { | |
2409 | off = align_address(off, (*p)->addralign()); | |
2410 | (*p)->set_address_and_file_offset(0, off); | |
2411 | off += (*p)->data_size(); | |
2412 | } | |
2413 | } | |
2414 | ||
1a2dff53 ILT |
2415 | unsigned int increase_relro = this->increase_relro_; |
2416 | if (this->script_options_->saw_sections_clause()) | |
2417 | increase_relro = 0; | |
2418 | ||
34810851 ILT |
2419 | const bool check_sections = parameters->options().check_sections(); |
2420 | Output_segment* last_load_segment = NULL; | |
2421 | ||
75f65a3e ILT |
2422 | bool was_readonly = false; |
2423 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
2424 | p != this->segment_list_.end(); | |
2425 | ++p) | |
2426 | { | |
2427 | if ((*p)->type() == elfcpp::PT_LOAD) | |
2428 | { | |
2429 | if (load_seg != NULL && load_seg != *p) | |
a3ad94ed | 2430 | gold_unreachable(); |
75f65a3e ILT |
2431 | load_seg = NULL; |
2432 | ||
756ac4a8 ILT |
2433 | bool are_addresses_set = (*p)->are_addresses_set(); |
2434 | if (are_addresses_set) | |
2435 | { | |
2436 | // When it comes to setting file offsets, we care about | |
2437 | // the physical address. | |
2438 | addr = (*p)->paddr(); | |
2439 | } | |
e55bde5e | 2440 | else if (parameters->options().user_set_Tdata() |
756ac4a8 | 2441 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
e55bde5e | 2442 | && (!parameters->options().user_set_Tbss() |
756ac4a8 ILT |
2443 | || (*p)->has_any_data_sections())) |
2444 | { | |
e55bde5e | 2445 | addr = parameters->options().Tdata(); |
756ac4a8 ILT |
2446 | are_addresses_set = true; |
2447 | } | |
e55bde5e | 2448 | else if (parameters->options().user_set_Tbss() |
756ac4a8 ILT |
2449 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
2450 | && !(*p)->has_any_data_sections()) | |
2451 | { | |
e55bde5e | 2452 | addr = parameters->options().Tbss(); |
756ac4a8 ILT |
2453 | are_addresses_set = true; |
2454 | } | |
2455 | ||
75f65a3e ILT |
2456 | uint64_t orig_addr = addr; |
2457 | uint64_t orig_off = off; | |
2458 | ||
a445fddf | 2459 | uint64_t aligned_addr = 0; |
75f65a3e | 2460 | uint64_t abi_pagesize = target->abi_pagesize(); |
af6156ef | 2461 | uint64_t common_pagesize = target->common_pagesize(); |
0496d5e5 | 2462 | |
af6156ef ILT |
2463 | if (!parameters->options().nmagic() |
2464 | && !parameters->options().omagic()) | |
2465 | (*p)->set_minimum_p_align(common_pagesize); | |
0496d5e5 | 2466 | |
8a5e3e08 | 2467 | if (!are_addresses_set) |
a445fddf ILT |
2468 | { |
2469 | // If the last segment was readonly, and this one is | |
2470 | // not, then skip the address forward one page, | |
2471 | // maintaining the same position within the page. This | |
2472 | // lets us store both segments overlapping on a single | |
2473 | // page in the file, but the loader will put them on | |
2474 | // different pages in memory. | |
2475 | ||
2476 | addr = align_address(addr, (*p)->maximum_alignment()); | |
75f65a3e | 2477 | aligned_addr = addr; |
a445fddf ILT |
2478 | |
2479 | if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0) | |
2480 | { | |
2481 | if ((addr & (abi_pagesize - 1)) != 0) | |
2482 | addr = addr + abi_pagesize; | |
2483 | } | |
2484 | ||
2485 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); | |
75f65a3e ILT |
2486 | } |
2487 | ||
8a5e3e08 ILT |
2488 | if (!parameters->options().nmagic() |
2489 | && !parameters->options().omagic()) | |
2490 | off = align_file_offset(off, addr, abi_pagesize); | |
661be1e2 ILT |
2491 | else if (load_seg == NULL) |
2492 | { | |
2493 | // This is -N or -n with a section script which prevents | |
2494 | // us from using a load segment. We need to ensure that | |
2495 | // the file offset is aligned to the alignment of the | |
2496 | // segment. This is because the linker script | |
2497 | // implicitly assumed a zero offset. If we don't align | |
2498 | // here, then the alignment of the sections in the | |
2499 | // linker script may not match the alignment of the | |
2500 | // sections in the set_section_addresses call below, | |
2501 | // causing an error about dot moving backward. | |
2502 | off = align_address(off, (*p)->maximum_alignment()); | |
2503 | } | |
8a5e3e08 | 2504 | |
ead1e424 | 2505 | unsigned int shndx_hold = *pshndx; |
96a2b4e4 | 2506 | uint64_t new_addr = (*p)->set_section_addresses(this, false, addr, |
1a2dff53 | 2507 | increase_relro, |
96a2b4e4 | 2508 | &off, pshndx); |
75f65a3e ILT |
2509 | |
2510 | // Now that we know the size of this segment, we may be able | |
2511 | // to save a page in memory, at the cost of wasting some | |
2512 | // file space, by instead aligning to the start of a new | |
2513 | // page. Here we use the real machine page size rather than | |
2514 | // the ABI mandated page size. | |
2515 | ||
a445fddf | 2516 | if (!are_addresses_set && aligned_addr != addr) |
75f65a3e | 2517 | { |
75f65a3e ILT |
2518 | uint64_t first_off = (common_pagesize |
2519 | - (aligned_addr | |
2520 | & (common_pagesize - 1))); | |
2521 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
2522 | if (first_off > 0 | |
2523 | && last_off > 0 | |
2524 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
2525 | != (new_addr & ~ (common_pagesize - 1))) | |
2526 | && first_off + last_off <= common_pagesize) | |
2527 | { | |
ead1e424 ILT |
2528 | *pshndx = shndx_hold; |
2529 | addr = align_address(aligned_addr, common_pagesize); | |
a445fddf | 2530 | addr = align_address(addr, (*p)->maximum_alignment()); |
75f65a3e | 2531 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
8a5e3e08 | 2532 | off = align_file_offset(off, addr, abi_pagesize); |
96a2b4e4 | 2533 | new_addr = (*p)->set_section_addresses(this, true, addr, |
1a2dff53 | 2534 | increase_relro, |
96a2b4e4 | 2535 | &off, pshndx); |
75f65a3e ILT |
2536 | } |
2537 | } | |
2538 | ||
2539 | addr = new_addr; | |
2540 | ||
2541 | if (((*p)->flags() & elfcpp::PF_W) == 0) | |
2542 | was_readonly = true; | |
34810851 ILT |
2543 | |
2544 | // Implement --check-sections. We know that the segments | |
2545 | // are sorted by LMA. | |
2546 | if (check_sections && last_load_segment != NULL) | |
2547 | { | |
2548 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); | |
2549 | if (last_load_segment->paddr() + last_load_segment->memsz() | |
2550 | > (*p)->paddr()) | |
2551 | { | |
2552 | unsigned long long lb1 = last_load_segment->paddr(); | |
2553 | unsigned long long le1 = lb1 + last_load_segment->memsz(); | |
2554 | unsigned long long lb2 = (*p)->paddr(); | |
2555 | unsigned long long le2 = lb2 + (*p)->memsz(); | |
2556 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " | |
2557 | "[0x%llx -> 0x%llx]"), | |
2558 | lb1, le1, lb2, le2); | |
2559 | } | |
2560 | } | |
2561 | last_load_segment = *p; | |
75f65a3e ILT |
2562 | } |
2563 | } | |
2564 | ||
2565 | // Handle the non-PT_LOAD segments, setting their offsets from their | |
2566 | // section's offsets. | |
2567 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
2568 | p != this->segment_list_.end(); | |
2569 | ++p) | |
2570 | { | |
2571 | if ((*p)->type() != elfcpp::PT_LOAD) | |
1a2dff53 ILT |
2572 | (*p)->set_offset((*p)->type() == elfcpp::PT_GNU_RELRO |
2573 | ? increase_relro | |
2574 | : 0); | |
75f65a3e ILT |
2575 | } |
2576 | ||
7bf1f802 ILT |
2577 | // Set the TLS offsets for each section in the PT_TLS segment. |
2578 | if (this->tls_segment_ != NULL) | |
2579 | this->tls_segment_->set_tls_offsets(); | |
2580 | ||
75f65a3e ILT |
2581 | return off; |
2582 | } | |
2583 | ||
6a74a719 ILT |
2584 | // Set the offsets of all the allocated sections when doing a |
2585 | // relocatable link. This does the same jobs as set_segment_offsets, | |
2586 | // only for a relocatable link. | |
2587 | ||
2588 | off_t | |
2589 | Layout::set_relocatable_section_offsets(Output_data* file_header, | |
2590 | unsigned int *pshndx) | |
2591 | { | |
2592 | off_t off = 0; | |
2593 | ||
2594 | file_header->set_address_and_file_offset(0, 0); | |
2595 | off += file_header->data_size(); | |
2596 | ||
2597 | for (Section_list::iterator p = this->section_list_.begin(); | |
2598 | p != this->section_list_.end(); | |
2599 | ++p) | |
2600 | { | |
2601 | // We skip unallocated sections here, except that group sections | |
2602 | // have to come first. | |
2603 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 | |
2604 | && (*p)->type() != elfcpp::SHT_GROUP) | |
2605 | continue; | |
2606 | ||
2607 | off = align_address(off, (*p)->addralign()); | |
2608 | ||
2609 | // The linker script might have set the address. | |
2610 | if (!(*p)->is_address_valid()) | |
2611 | (*p)->set_address(0); | |
2612 | (*p)->set_file_offset(off); | |
2613 | (*p)->finalize_data_size(); | |
2614 | off += (*p)->data_size(); | |
2615 | ||
2616 | (*p)->set_out_shndx(*pshndx); | |
2617 | ++*pshndx; | |
2618 | } | |
2619 | ||
2620 | return off; | |
2621 | } | |
2622 | ||
75f65a3e ILT |
2623 | // Set the file offset of all the sections not associated with a |
2624 | // segment. | |
2625 | ||
2626 | off_t | |
9a0910c3 | 2627 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 2628 | { |
a3ad94ed ILT |
2629 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
2630 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
2631 | ++p) |
2632 | { | |
27bc2bce ILT |
2633 | // The symtab section is handled in create_symtab_sections. |
2634 | if (*p == this->symtab_section_) | |
61ba1cf9 | 2635 | continue; |
27bc2bce | 2636 | |
a9a60db6 ILT |
2637 | // If we've already set the data size, don't set it again. |
2638 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) | |
2639 | continue; | |
2640 | ||
96803768 ILT |
2641 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2642 | && (*p)->requires_postprocessing()) | |
17a1d0a9 ILT |
2643 | { |
2644 | (*p)->create_postprocessing_buffer(); | |
2645 | this->any_postprocessing_sections_ = true; | |
2646 | } | |
96803768 | 2647 | |
9a0910c3 ILT |
2648 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2649 | && (*p)->after_input_sections()) | |
2650 | continue; | |
17a1d0a9 | 2651 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
2652 | && (!(*p)->after_input_sections() |
2653 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
2654 | continue; | |
17a1d0a9 | 2655 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
2656 | && (!(*p)->after_input_sections() |
2657 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
2658 | continue; | |
27bc2bce | 2659 | |
ead1e424 | 2660 | off = align_address(off, (*p)->addralign()); |
27bc2bce ILT |
2661 | (*p)->set_file_offset(off); |
2662 | (*p)->finalize_data_size(); | |
75f65a3e | 2663 | off += (*p)->data_size(); |
96803768 ILT |
2664 | |
2665 | // At this point the name must be set. | |
17a1d0a9 | 2666 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
96803768 | 2667 | this->namepool_.add((*p)->name(), false, NULL); |
75f65a3e ILT |
2668 | } |
2669 | return off; | |
2670 | } | |
2671 | ||
86887060 ILT |
2672 | // Set the section indexes of all the sections not associated with a |
2673 | // segment. | |
2674 | ||
2675 | unsigned int | |
2676 | Layout::set_section_indexes(unsigned int shndx) | |
2677 | { | |
2678 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
2679 | p != this->unattached_section_list_.end(); | |
2680 | ++p) | |
2681 | { | |
d491d34e ILT |
2682 | if (!(*p)->has_out_shndx()) |
2683 | { | |
2684 | (*p)->set_out_shndx(shndx); | |
2685 | ++shndx; | |
2686 | } | |
86887060 ILT |
2687 | } |
2688 | return shndx; | |
2689 | } | |
2690 | ||
a445fddf ILT |
2691 | // Set the section addresses according to the linker script. This is |
2692 | // only called when we see a SECTIONS clause. This returns the | |
2693 | // program segment which should hold the file header and segment | |
2694 | // headers, if any. It will return NULL if they should not be in a | |
2695 | // segment. | |
2696 | ||
2697 | Output_segment* | |
2698 | Layout::set_section_addresses_from_script(Symbol_table* symtab) | |
20e6d0d6 DK |
2699 | { |
2700 | Script_sections* ss = this->script_options_->script_sections(); | |
2701 | gold_assert(ss->saw_sections_clause()); | |
2702 | return this->script_options_->set_section_addresses(symtab, this); | |
2703 | } | |
2704 | ||
2705 | // Place the orphan sections in the linker script. | |
2706 | ||
2707 | void | |
2708 | Layout::place_orphan_sections_in_script() | |
a445fddf ILT |
2709 | { |
2710 | Script_sections* ss = this->script_options_->script_sections(); | |
2711 | gold_assert(ss->saw_sections_clause()); | |
2712 | ||
2713 | // Place each orphaned output section in the script. | |
2714 | for (Section_list::iterator p = this->section_list_.begin(); | |
2715 | p != this->section_list_.end(); | |
2716 | ++p) | |
2717 | { | |
2718 | if (!(*p)->found_in_sections_clause()) | |
2719 | ss->place_orphan(*p); | |
2720 | } | |
a445fddf ILT |
2721 | } |
2722 | ||
7bf1f802 ILT |
2723 | // Count the local symbols in the regular symbol table and the dynamic |
2724 | // symbol table, and build the respective string pools. | |
2725 | ||
2726 | void | |
17a1d0a9 ILT |
2727 | Layout::count_local_symbols(const Task* task, |
2728 | const Input_objects* input_objects) | |
7bf1f802 | 2729 | { |
6d013333 ILT |
2730 | // First, figure out an upper bound on the number of symbols we'll |
2731 | // be inserting into each pool. This helps us create the pools with | |
2732 | // the right size, to avoid unnecessary hashtable resizing. | |
2733 | unsigned int symbol_count = 0; | |
2734 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2735 | p != input_objects->relobj_end(); | |
2736 | ++p) | |
2737 | symbol_count += (*p)->local_symbol_count(); | |
2738 | ||
2739 | // Go from "upper bound" to "estimate." We overcount for two | |
2740 | // reasons: we double-count symbols that occur in more than one | |
2741 | // object file, and we count symbols that are dropped from the | |
2742 | // output. Add it all together and assume we overcount by 100%. | |
2743 | symbol_count /= 2; | |
2744 | ||
2745 | // We assume all symbols will go into both the sympool and dynpool. | |
2746 | this->sympool_.reserve(symbol_count); | |
2747 | this->dynpool_.reserve(symbol_count); | |
2748 | ||
7bf1f802 ILT |
2749 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2750 | p != input_objects->relobj_end(); | |
2751 | ++p) | |
2752 | { | |
17a1d0a9 | 2753 | Task_lock_obj<Object> tlo(task, *p); |
7bf1f802 ILT |
2754 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
2755 | } | |
2756 | } | |
2757 | ||
b8e6aad9 ILT |
2758 | // Create the symbol table sections. Here we also set the final |
2759 | // values of the symbols. At this point all the loadable sections are | |
d491d34e | 2760 | // fully laid out. SHNUM is the number of sections so far. |
75f65a3e ILT |
2761 | |
2762 | void | |
9025d29d | 2763 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 2764 | Symbol_table* symtab, |
d491d34e | 2765 | unsigned int shnum, |
16649710 | 2766 | off_t* poff) |
75f65a3e | 2767 | { |
61ba1cf9 ILT |
2768 | int symsize; |
2769 | unsigned int align; | |
8851ecca | 2770 | if (parameters->target().get_size() == 32) |
61ba1cf9 ILT |
2771 | { |
2772 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
2773 | align = 4; | |
2774 | } | |
8851ecca | 2775 | else if (parameters->target().get_size() == 64) |
61ba1cf9 ILT |
2776 | { |
2777 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
2778 | align = 8; | |
2779 | } | |
2780 | else | |
a3ad94ed | 2781 | gold_unreachable(); |
61ba1cf9 ILT |
2782 | |
2783 | off_t off = *poff; | |
ead1e424 | 2784 | off = align_address(off, align); |
61ba1cf9 ILT |
2785 | off_t startoff = off; |
2786 | ||
2787 | // Save space for the dummy symbol at the start of the section. We | |
2788 | // never bother to write this out--it will just be left as zero. | |
2789 | off += symsize; | |
c06b7b0b | 2790 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 2791 | |
a3ad94ed ILT |
2792 | // Add STT_SECTION symbols for each Output section which needs one. |
2793 | for (Section_list::iterator p = this->section_list_.begin(); | |
2794 | p != this->section_list_.end(); | |
2795 | ++p) | |
2796 | { | |
2797 | if (!(*p)->needs_symtab_index()) | |
2798 | (*p)->set_symtab_index(-1U); | |
2799 | else | |
2800 | { | |
2801 | (*p)->set_symtab_index(local_symbol_index); | |
2802 | ++local_symbol_index; | |
2803 | off += symsize; | |
2804 | } | |
2805 | } | |
2806 | ||
f6ce93d6 ILT |
2807 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2808 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
2809 | ++p) |
2810 | { | |
c06b7b0b | 2811 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
ef15dade | 2812 | off, symtab); |
c06b7b0b ILT |
2813 | off += (index - local_symbol_index) * symsize; |
2814 | local_symbol_index = index; | |
75f65a3e ILT |
2815 | } |
2816 | ||
c06b7b0b | 2817 | unsigned int local_symcount = local_symbol_index; |
75aea3d0 | 2818 | gold_assert(static_cast<off_t>(local_symcount * symsize) == off - startoff); |
61ba1cf9 | 2819 | |
16649710 ILT |
2820 | off_t dynoff; |
2821 | size_t dyn_global_index; | |
2822 | size_t dyncount; | |
2823 | if (this->dynsym_section_ == NULL) | |
2824 | { | |
2825 | dynoff = 0; | |
2826 | dyn_global_index = 0; | |
2827 | dyncount = 0; | |
2828 | } | |
2829 | else | |
2830 | { | |
2831 | dyn_global_index = this->dynsym_section_->info(); | |
2832 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); | |
2833 | dynoff = this->dynsym_section_->offset() + locsize; | |
2834 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 2835 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
2836 | == this->dynsym_section_->data_size() - locsize); |
2837 | } | |
2838 | ||
55a93433 ILT |
2839 | off = symtab->finalize(off, dynoff, dyn_global_index, dyncount, |
2840 | &this->sympool_, &local_symcount); | |
75f65a3e | 2841 | |
8851ecca | 2842 | if (!parameters->options().strip_all()) |
9e2dcb77 ILT |
2843 | { |
2844 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 2845 | |
cfd73a4e | 2846 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
2847 | Output_section* osymtab = this->make_output_section(symtab_name, |
2848 | elfcpp::SHT_SYMTAB, | |
1a2dff53 ILT |
2849 | 0, false, false, |
2850 | false, false, false); | |
9e2dcb77 | 2851 | this->symtab_section_ = osymtab; |
a3ad94ed | 2852 | |
27bc2bce | 2853 | Output_section_data* pos = new Output_data_fixed_space(off - startoff, |
7d9e3d98 ILT |
2854 | align, |
2855 | "** symtab"); | |
9e2dcb77 | 2856 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 2857 | |
d491d34e ILT |
2858 | // We generate a .symtab_shndx section if we have more than |
2859 | // SHN_LORESERVE sections. Technically it is possible that we | |
2860 | // don't need one, because it is possible that there are no | |
2861 | // symbols in any of sections with indexes larger than | |
2862 | // SHN_LORESERVE. That is probably unusual, though, and it is | |
2863 | // easier to always create one than to compute section indexes | |
2864 | // twice (once here, once when writing out the symbols). | |
2865 | if (shnum >= elfcpp::SHN_LORESERVE) | |
2866 | { | |
2867 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", | |
2868 | false, NULL); | |
2869 | Output_section* osymtab_xindex = | |
2870 | this->make_output_section(symtab_xindex_name, | |
f5c870d2 | 2871 | elfcpp::SHT_SYMTAB_SHNDX, 0, false, |
1a2dff53 | 2872 | false, false, false, false); |
d491d34e ILT |
2873 | |
2874 | size_t symcount = (off - startoff) / symsize; | |
2875 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); | |
2876 | ||
2877 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); | |
2878 | ||
2879 | osymtab_xindex->set_link_section(osymtab); | |
2880 | osymtab_xindex->set_addralign(4); | |
2881 | osymtab_xindex->set_entsize(4); | |
2882 | ||
2883 | osymtab_xindex->set_after_input_sections(); | |
2884 | ||
2885 | // This tells the driver code to wait until the symbol table | |
2886 | // has written out before writing out the postprocessing | |
2887 | // sections, including the .symtab_shndx section. | |
2888 | this->any_postprocessing_sections_ = true; | |
2889 | } | |
2890 | ||
cfd73a4e | 2891 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
2892 | Output_section* ostrtab = this->make_output_section(strtab_name, |
2893 | elfcpp::SHT_STRTAB, | |
1a2dff53 ILT |
2894 | 0, false, false, |
2895 | false, false, false); | |
a3ad94ed | 2896 | |
9e2dcb77 ILT |
2897 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
2898 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 2899 | |
27bc2bce ILT |
2900 | osymtab->set_file_offset(startoff); |
2901 | osymtab->finalize_data_size(); | |
9e2dcb77 ILT |
2902 | osymtab->set_link_section(ostrtab); |
2903 | osymtab->set_info(local_symcount); | |
2904 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 2905 | |
9e2dcb77 ILT |
2906 | *poff = off; |
2907 | } | |
75f65a3e ILT |
2908 | } |
2909 | ||
2910 | // Create the .shstrtab section, which holds the names of the | |
2911 | // sections. At the time this is called, we have created all the | |
2912 | // output sections except .shstrtab itself. | |
2913 | ||
2914 | Output_section* | |
2915 | Layout::create_shstrtab() | |
2916 | { | |
2917 | // FIXME: We don't need to create a .shstrtab section if we are | |
2918 | // stripping everything. | |
2919 | ||
cfd73a4e | 2920 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 2921 | |
f5c870d2 | 2922 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0, |
1a2dff53 ILT |
2923 | false, false, false, false, |
2924 | false); | |
75f65a3e | 2925 | |
0e0d5469 ILT |
2926 | if (strcmp(parameters->options().compress_debug_sections(), "none") != 0) |
2927 | { | |
2928 | // We can't write out this section until we've set all the | |
2929 | // section names, and we don't set the names of compressed | |
2930 | // output sections until relocations are complete. FIXME: With | |
2931 | // the current names we use, this is unnecessary. | |
2932 | os->set_after_input_sections(); | |
2933 | } | |
27bc2bce | 2934 | |
a3ad94ed ILT |
2935 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
2936 | os->add_output_section_data(posd); | |
75f65a3e ILT |
2937 | |
2938 | return os; | |
2939 | } | |
2940 | ||
2941 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
2942 | // offset. | |
2943 | ||
27bc2bce | 2944 | void |
d491d34e | 2945 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
75f65a3e ILT |
2946 | { |
2947 | Output_section_headers* oshdrs; | |
9025d29d | 2948 | oshdrs = new Output_section_headers(this, |
16649710 | 2949 | &this->segment_list_, |
6a74a719 | 2950 | &this->section_list_, |
16649710 | 2951 | &this->unattached_section_list_, |
d491d34e ILT |
2952 | &this->namepool_, |
2953 | shstrtab_section); | |
ead1e424 | 2954 | off_t off = align_address(*poff, oshdrs->addralign()); |
27bc2bce | 2955 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 ILT |
2956 | off += oshdrs->data_size(); |
2957 | *poff = off; | |
27bc2bce | 2958 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
2959 | } |
2960 | ||
d491d34e ILT |
2961 | // Count the allocated sections. |
2962 | ||
2963 | size_t | |
2964 | Layout::allocated_output_section_count() const | |
2965 | { | |
2966 | size_t section_count = 0; | |
2967 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
2968 | p != this->segment_list_.end(); | |
2969 | ++p) | |
2970 | section_count += (*p)->output_section_count(); | |
2971 | return section_count; | |
2972 | } | |
2973 | ||
dbe717ef ILT |
2974 | // Create the dynamic symbol table. |
2975 | ||
2976 | void | |
7bf1f802 | 2977 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
9b07f471 | 2978 | Symbol_table* symtab, |
14b31740 ILT |
2979 | Output_section **pdynstr, |
2980 | unsigned int* plocal_dynamic_count, | |
2981 | std::vector<Symbol*>* pdynamic_symbols, | |
2982 | Versions* pversions) | |
dbe717ef | 2983 | { |
a3ad94ed ILT |
2984 | // Count all the symbols in the dynamic symbol table, and set the |
2985 | // dynamic symbol indexes. | |
dbe717ef | 2986 | |
a3ad94ed ILT |
2987 | // Skip symbol 0, which is always all zeroes. |
2988 | unsigned int index = 1; | |
dbe717ef | 2989 | |
a3ad94ed ILT |
2990 | // Add STT_SECTION symbols for each Output section which needs one. |
2991 | for (Section_list::iterator p = this->section_list_.begin(); | |
2992 | p != this->section_list_.end(); | |
2993 | ++p) | |
2994 | { | |
2995 | if (!(*p)->needs_dynsym_index()) | |
2996 | (*p)->set_dynsym_index(-1U); | |
2997 | else | |
2998 | { | |
2999 | (*p)->set_dynsym_index(index); | |
3000 | ++index; | |
3001 | } | |
3002 | } | |
3003 | ||
7bf1f802 ILT |
3004 | // Count the local symbols that need to go in the dynamic symbol table, |
3005 | // and set the dynamic symbol indexes. | |
3006 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
3007 | p != input_objects->relobj_end(); | |
3008 | ++p) | |
3009 | { | |
3010 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
3011 | index = new_index; | |
3012 | } | |
a3ad94ed ILT |
3013 | |
3014 | unsigned int local_symcount = index; | |
14b31740 | 3015 | *plocal_dynamic_count = local_symcount; |
a3ad94ed | 3016 | |
9b07f471 | 3017 | index = symtab->set_dynsym_indexes(index, pdynamic_symbols, |
35cdfc9a | 3018 | &this->dynpool_, pversions); |
a3ad94ed ILT |
3019 | |
3020 | int symsize; | |
3021 | unsigned int align; | |
8851ecca | 3022 | const int size = parameters->target().get_size(); |
a3ad94ed ILT |
3023 | if (size == 32) |
3024 | { | |
3025 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
3026 | align = 4; | |
3027 | } | |
3028 | else if (size == 64) | |
3029 | { | |
3030 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
3031 | align = 8; | |
3032 | } | |
3033 | else | |
3034 | gold_unreachable(); | |
3035 | ||
14b31740 ILT |
3036 | // Create the dynamic symbol table section. |
3037 | ||
3802b2dd ILT |
3038 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
3039 | elfcpp::SHT_DYNSYM, | |
3040 | elfcpp::SHF_ALLOC, | |
1a2dff53 ILT |
3041 | false, false, true, |
3042 | false, false, false); | |
a3ad94ed | 3043 | |
27bc2bce | 3044 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, |
7d9e3d98 ILT |
3045 | align, |
3046 | "** dynsym"); | |
a3ad94ed ILT |
3047 | dynsym->add_output_section_data(odata); |
3048 | ||
3049 | dynsym->set_info(local_symcount); | |
3050 | dynsym->set_entsize(symsize); | |
3051 | dynsym->set_addralign(align); | |
3052 | ||
3053 | this->dynsym_section_ = dynsym; | |
3054 | ||
16649710 | 3055 | Output_data_dynamic* const odyn = this->dynamic_data_; |
a3ad94ed ILT |
3056 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); |
3057 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
3058 | ||
d491d34e ILT |
3059 | // If there are more than SHN_LORESERVE allocated sections, we |
3060 | // create a .dynsym_shndx section. It is possible that we don't | |
3061 | // need one, because it is possible that there are no dynamic | |
3062 | // symbols in any of the sections with indexes larger than | |
3063 | // SHN_LORESERVE. This is probably unusual, though, and at this | |
3064 | // time we don't know the actual section indexes so it is | |
3065 | // inconvenient to check. | |
3066 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) | |
3067 | { | |
2ea97941 | 3068 | Output_section* dynsym_xindex = |
d491d34e ILT |
3069 | this->choose_output_section(NULL, ".dynsym_shndx", |
3070 | elfcpp::SHT_SYMTAB_SHNDX, | |
3071 | elfcpp::SHF_ALLOC, | |
1a2dff53 | 3072 | false, false, true, false, false, false); |
d491d34e ILT |
3073 | |
3074 | this->dynsym_xindex_ = new Output_symtab_xindex(index); | |
3075 | ||
2ea97941 | 3076 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); |
d491d34e | 3077 | |
2ea97941 ILT |
3078 | dynsym_xindex->set_link_section(dynsym); |
3079 | dynsym_xindex->set_addralign(4); | |
3080 | dynsym_xindex->set_entsize(4); | |
d491d34e | 3081 | |
2ea97941 | 3082 | dynsym_xindex->set_after_input_sections(); |
d491d34e ILT |
3083 | |
3084 | // This tells the driver code to wait until the symbol table has | |
3085 | // written out before writing out the postprocessing sections, | |
3086 | // including the .dynsym_shndx section. | |
3087 | this->any_postprocessing_sections_ = true; | |
3088 | } | |
3089 | ||
14b31740 ILT |
3090 | // Create the dynamic string table section. |
3091 | ||
3802b2dd ILT |
3092 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
3093 | elfcpp::SHT_STRTAB, | |
3094 | elfcpp::SHF_ALLOC, | |
1a2dff53 ILT |
3095 | false, false, true, |
3096 | false, false, false); | |
a3ad94ed ILT |
3097 | |
3098 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
3099 | dynstr->add_output_section_data(strdata); | |
3100 | ||
16649710 ILT |
3101 | dynsym->set_link_section(dynstr); |
3102 | this->dynamic_section_->set_link_section(dynstr); | |
3103 | ||
a3ad94ed ILT |
3104 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); |
3105 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
3106 | ||
14b31740 ILT |
3107 | *pdynstr = dynstr; |
3108 | ||
3109 | // Create the hash tables. | |
3110 | ||
13670ee6 ILT |
3111 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
3112 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
3113 | { | |
3114 | unsigned char* phash; | |
3115 | unsigned int hashlen; | |
3116 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, | |
3117 | &phash, &hashlen); | |
3118 | ||
3119 | Output_section* hashsec = this->choose_output_section(NULL, ".hash", | |
3120 | elfcpp::SHT_HASH, | |
3121 | elfcpp::SHF_ALLOC, | |
1a2dff53 ILT |
3122 | false, false, true, |
3123 | false, false, | |
3124 | false); | |
13670ee6 ILT |
3125 | |
3126 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
3127 | hashlen, | |
7d9e3d98 ILT |
3128 | align, |
3129 | "** hash"); | |
13670ee6 ILT |
3130 | hashsec->add_output_section_data(hashdata); |
3131 | ||
3132 | hashsec->set_link_section(dynsym); | |
3133 | hashsec->set_entsize(4); | |
a3ad94ed | 3134 | |
13670ee6 ILT |
3135 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); |
3136 | } | |
3137 | ||
3138 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 | |
3139 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
3140 | { | |
3141 | unsigned char* phash; | |
3142 | unsigned int hashlen; | |
3143 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, local_symcount, | |
3144 | &phash, &hashlen); | |
a3ad94ed | 3145 | |
13670ee6 ILT |
3146 | Output_section* hashsec = this->choose_output_section(NULL, ".gnu.hash", |
3147 | elfcpp::SHT_GNU_HASH, | |
3148 | elfcpp::SHF_ALLOC, | |
1a2dff53 ILT |
3149 | false, false, true, |
3150 | false, false, | |
3151 | false); | |
a3ad94ed | 3152 | |
13670ee6 ILT |
3153 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
3154 | hashlen, | |
7d9e3d98 ILT |
3155 | align, |
3156 | "** hash"); | |
13670ee6 | 3157 | hashsec->add_output_section_data(hashdata); |
a3ad94ed | 3158 | |
13670ee6 | 3159 | hashsec->set_link_section(dynsym); |
1b81fb71 ILT |
3160 | |
3161 | // For a 64-bit target, the entries in .gnu.hash do not have a | |
3162 | // uniform size, so we only set the entry size for a 32-bit | |
3163 | // target. | |
3164 | if (parameters->target().get_size() == 32) | |
3165 | hashsec->set_entsize(4); | |
a3ad94ed | 3166 | |
13670ee6 ILT |
3167 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); |
3168 | } | |
dbe717ef ILT |
3169 | } |
3170 | ||
7bf1f802 ILT |
3171 | // Assign offsets to each local portion of the dynamic symbol table. |
3172 | ||
3173 | void | |
3174 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
3175 | { | |
3176 | Output_section* dynsym = this->dynsym_section_; | |
3177 | gold_assert(dynsym != NULL); | |
3178 | ||
3179 | off_t off = dynsym->offset(); | |
3180 | ||
3181 | // Skip the dummy symbol at the start of the section. | |
3182 | off += dynsym->entsize(); | |
3183 | ||
3184 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
3185 | p != input_objects->relobj_end(); | |
3186 | ++p) | |
3187 | { | |
3188 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
3189 | off += count * dynsym->entsize(); | |
3190 | } | |
3191 | } | |
3192 | ||
14b31740 ILT |
3193 | // Create the version sections. |
3194 | ||
3195 | void | |
9025d29d | 3196 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 3197 | const Symbol_table* symtab, |
14b31740 ILT |
3198 | unsigned int local_symcount, |
3199 | const std::vector<Symbol*>& dynamic_symbols, | |
3200 | const Output_section* dynstr) | |
3201 | { | |
3202 | if (!versions->any_defs() && !versions->any_needs()) | |
3203 | return; | |
3204 | ||
8851ecca | 3205 | switch (parameters->size_and_endianness()) |
14b31740 | 3206 | { |
193a53d9 | 3207 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 3208 | case Parameters::TARGET_32_LITTLE: |
7d1a9ebb ILT |
3209 | this->sized_create_version_sections<32, false>(versions, symtab, |
3210 | local_symcount, | |
3211 | dynamic_symbols, dynstr); | |
8851ecca | 3212 | break; |
193a53d9 | 3213 | #endif |
8851ecca ILT |
3214 | #ifdef HAVE_TARGET_32_BIG |
3215 | case Parameters::TARGET_32_BIG: | |
7d1a9ebb ILT |
3216 | this->sized_create_version_sections<32, true>(versions, symtab, |
3217 | local_symcount, | |
3218 | dynamic_symbols, dynstr); | |
8851ecca | 3219 | break; |
193a53d9 | 3220 | #endif |
193a53d9 | 3221 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 3222 | case Parameters::TARGET_64_LITTLE: |
7d1a9ebb ILT |
3223 | this->sized_create_version_sections<64, false>(versions, symtab, |
3224 | local_symcount, | |
3225 | dynamic_symbols, dynstr); | |
8851ecca | 3226 | break; |
193a53d9 | 3227 | #endif |
8851ecca ILT |
3228 | #ifdef HAVE_TARGET_64_BIG |
3229 | case Parameters::TARGET_64_BIG: | |
7d1a9ebb ILT |
3230 | this->sized_create_version_sections<64, true>(versions, symtab, |
3231 | local_symcount, | |
3232 | dynamic_symbols, dynstr); | |
8851ecca ILT |
3233 | break; |
3234 | #endif | |
3235 | default: | |
3236 | gold_unreachable(); | |
14b31740 | 3237 | } |
14b31740 ILT |
3238 | } |
3239 | ||
3240 | // Create the version sections, sized version. | |
3241 | ||
3242 | template<int size, bool big_endian> | |
3243 | void | |
3244 | Layout::sized_create_version_sections( | |
3245 | const Versions* versions, | |
46fe1623 | 3246 | const Symbol_table* symtab, |
14b31740 ILT |
3247 | unsigned int local_symcount, |
3248 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 3249 | const Output_section* dynstr) |
14b31740 | 3250 | { |
3802b2dd ILT |
3251 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
3252 | elfcpp::SHT_GNU_versym, | |
3253 | elfcpp::SHF_ALLOC, | |
1a2dff53 ILT |
3254 | false, false, true, |
3255 | false, false, false); | |
14b31740 ILT |
3256 | |
3257 | unsigned char* vbuf; | |
3258 | unsigned int vsize; | |
7d1a9ebb ILT |
3259 | versions->symbol_section_contents<size, big_endian>(symtab, &this->dynpool_, |
3260 | local_symcount, | |
3261 | dynamic_symbols, | |
3262 | &vbuf, &vsize); | |
14b31740 | 3263 | |
7d9e3d98 ILT |
3264 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, |
3265 | "** versions"); | |
14b31740 ILT |
3266 | |
3267 | vsec->add_output_section_data(vdata); | |
3268 | vsec->set_entsize(2); | |
3269 | vsec->set_link_section(this->dynsym_section_); | |
3270 | ||
3271 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
3272 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
3273 | ||
3274 | if (versions->any_defs()) | |
3275 | { | |
3802b2dd ILT |
3276 | Output_section* vdsec; |
3277 | vdsec= this->choose_output_section(NULL, ".gnu.version_d", | |
3278 | elfcpp::SHT_GNU_verdef, | |
3279 | elfcpp::SHF_ALLOC, | |
1a2dff53 ILT |
3280 | false, false, true, false, false, |
3281 | false); | |
14b31740 ILT |
3282 | |
3283 | unsigned char* vdbuf; | |
3284 | unsigned int vdsize; | |
3285 | unsigned int vdentries; | |
7d1a9ebb ILT |
3286 | versions->def_section_contents<size, big_endian>(&this->dynpool_, &vdbuf, |
3287 | &vdsize, &vdentries); | |
14b31740 | 3288 | |
7d9e3d98 ILT |
3289 | Output_section_data* vddata = |
3290 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); | |
14b31740 ILT |
3291 | |
3292 | vdsec->add_output_section_data(vddata); | |
3293 | vdsec->set_link_section(dynstr); | |
3294 | vdsec->set_info(vdentries); | |
3295 | ||
3296 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
3297 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
3298 | } | |
3299 | ||
3300 | if (versions->any_needs()) | |
3301 | { | |
14b31740 | 3302 | Output_section* vnsec; |
3802b2dd ILT |
3303 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
3304 | elfcpp::SHT_GNU_verneed, | |
3305 | elfcpp::SHF_ALLOC, | |
1a2dff53 ILT |
3306 | false, false, true, false, false, |
3307 | false); | |
14b31740 ILT |
3308 | |
3309 | unsigned char* vnbuf; | |
3310 | unsigned int vnsize; | |
3311 | unsigned int vnentries; | |
7d1a9ebb ILT |
3312 | versions->need_section_contents<size, big_endian>(&this->dynpool_, |
3313 | &vnbuf, &vnsize, | |
3314 | &vnentries); | |
14b31740 | 3315 | |
7d9e3d98 ILT |
3316 | Output_section_data* vndata = |
3317 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); | |
14b31740 ILT |
3318 | |
3319 | vnsec->add_output_section_data(vndata); | |
3320 | vnsec->set_link_section(dynstr); | |
3321 | vnsec->set_info(vnentries); | |
3322 | ||
3323 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
3324 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
3325 | } | |
3326 | } | |
3327 | ||
dbe717ef ILT |
3328 | // Create the .interp section and PT_INTERP segment. |
3329 | ||
3330 | void | |
3331 | Layout::create_interp(const Target* target) | |
3332 | { | |
e55bde5e | 3333 | const char* interp = parameters->options().dynamic_linker(); |
dbe717ef ILT |
3334 | if (interp == NULL) |
3335 | { | |
3336 | interp = target->dynamic_linker(); | |
a3ad94ed | 3337 | gold_assert(interp != NULL); |
dbe717ef ILT |
3338 | } |
3339 | ||
3340 | size_t len = strlen(interp) + 1; | |
3341 | ||
3342 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
3343 | ||
3802b2dd ILT |
3344 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
3345 | elfcpp::SHT_PROGBITS, | |
3346 | elfcpp::SHF_ALLOC, | |
1a2dff53 ILT |
3347 | false, true, true, |
3348 | false, false, false); | |
dbe717ef ILT |
3349 | osec->add_output_section_data(odata); |
3350 | ||
1c4f3631 ILT |
3351 | if (!this->script_options_->saw_phdrs_clause()) |
3352 | { | |
3353 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_INTERP, | |
3354 | elfcpp::PF_R); | |
f5c870d2 | 3355 | oseg->add_output_section(osec, elfcpp::PF_R, false); |
1c4f3631 | 3356 | } |
dbe717ef ILT |
3357 | } |
3358 | ||
ea715a34 ILT |
3359 | // Add dynamic tags for the PLT and the dynamic relocs. This is |
3360 | // called by the target-specific code. This does nothing if not doing | |
3361 | // a dynamic link. | |
3362 | ||
3363 | // USE_REL is true for REL relocs rather than RELA relocs. | |
3364 | ||
3365 | // If PLT_GOT is not NULL, then DT_PLTGOT points to it. | |
3366 | ||
3367 | // If PLT_REL is not NULL, it is used for DT_PLTRELSZ, and DT_JMPREL, | |
e291e7b9 ILT |
3368 | // and we also set DT_PLTREL. We use PLT_REL's output section, since |
3369 | // some targets have multiple reloc sections in PLT_REL. | |
ea715a34 ILT |
3370 | |
3371 | // If DYN_REL is not NULL, it is used for DT_REL/DT_RELA, | |
3372 | // DT_RELSZ/DT_RELASZ, DT_RELENT/DT_RELAENT. | |
3373 | ||
3374 | // If ADD_DEBUG is true, we add a DT_DEBUG entry when generating an | |
3375 | // executable. | |
3376 | ||
3377 | void | |
3378 | Layout::add_target_dynamic_tags(bool use_rel, const Output_data* plt_got, | |
3379 | const Output_data* plt_rel, | |
3a44184e | 3380 | const Output_data_reloc_generic* dyn_rel, |
612a8d3d | 3381 | bool add_debug, bool dynrel_includes_plt) |
ea715a34 ILT |
3382 | { |
3383 | Output_data_dynamic* odyn = this->dynamic_data_; | |
3384 | if (odyn == NULL) | |
3385 | return; | |
3386 | ||
3387 | if (plt_got != NULL && plt_got->output_section() != NULL) | |
3388 | odyn->add_section_address(elfcpp::DT_PLTGOT, plt_got); | |
3389 | ||
3390 | if (plt_rel != NULL && plt_rel->output_section() != NULL) | |
3391 | { | |
e291e7b9 ILT |
3392 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, plt_rel->output_section()); |
3393 | odyn->add_section_address(elfcpp::DT_JMPREL, plt_rel->output_section()); | |
ea715a34 ILT |
3394 | odyn->add_constant(elfcpp::DT_PLTREL, |
3395 | use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA); | |
3396 | } | |
3397 | ||
3398 | if (dyn_rel != NULL && dyn_rel->output_section() != NULL) | |
3399 | { | |
3400 | odyn->add_section_address(use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA, | |
3401 | dyn_rel); | |
612a8d3d DM |
3402 | if (plt_rel != NULL && dynrel_includes_plt) |
3403 | odyn->add_section_size(use_rel ? elfcpp::DT_RELSZ : elfcpp::DT_RELASZ, | |
3404 | dyn_rel, plt_rel); | |
3405 | else | |
3406 | odyn->add_section_size(use_rel ? elfcpp::DT_RELSZ : elfcpp::DT_RELASZ, | |
3407 | dyn_rel); | |
ea715a34 ILT |
3408 | const int size = parameters->target().get_size(); |
3409 | elfcpp::DT rel_tag; | |
3410 | int rel_size; | |
3411 | if (use_rel) | |
3412 | { | |
3413 | rel_tag = elfcpp::DT_RELENT; | |
3414 | if (size == 32) | |
3415 | rel_size = Reloc_types<elfcpp::SHT_REL, 32, false>::reloc_size; | |
3416 | else if (size == 64) | |
3417 | rel_size = Reloc_types<elfcpp::SHT_REL, 64, false>::reloc_size; | |
3418 | else | |
3419 | gold_unreachable(); | |
3420 | } | |
3421 | else | |
3422 | { | |
3423 | rel_tag = elfcpp::DT_RELAENT; | |
3424 | if (size == 32) | |
3425 | rel_size = Reloc_types<elfcpp::SHT_RELA, 32, false>::reloc_size; | |
3426 | else if (size == 64) | |
3427 | rel_size = Reloc_types<elfcpp::SHT_RELA, 64, false>::reloc_size; | |
3428 | else | |
3429 | gold_unreachable(); | |
3430 | } | |
3431 | odyn->add_constant(rel_tag, rel_size); | |
3a44184e ILT |
3432 | |
3433 | if (parameters->options().combreloc()) | |
3434 | { | |
3435 | size_t c = dyn_rel->relative_reloc_count(); | |
3436 | if (c > 0) | |
3437 | odyn->add_constant((use_rel | |
3438 | ? elfcpp::DT_RELCOUNT | |
3439 | : elfcpp::DT_RELACOUNT), | |
3440 | c); | |
3441 | } | |
ea715a34 ILT |
3442 | } |
3443 | ||
3444 | if (add_debug && !parameters->options().shared()) | |
3445 | { | |
3446 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
3447 | // linker at run time, and used by the debugger. | |
3448 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
3449 | } | |
3450 | } | |
3451 | ||
a3ad94ed ILT |
3452 | // Finish the .dynamic section and PT_DYNAMIC segment. |
3453 | ||
3454 | void | |
3455 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 3456 | const Symbol_table* symtab) |
a3ad94ed | 3457 | { |
1c4f3631 ILT |
3458 | if (!this->script_options_->saw_phdrs_clause()) |
3459 | { | |
3460 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, | |
3461 | (elfcpp::PF_R | |
3462 | | elfcpp::PF_W)); | |
01676dcd | 3463 | oseg->add_output_section(this->dynamic_section_, |
f5c870d2 ILT |
3464 | elfcpp::PF_R | elfcpp::PF_W, |
3465 | false); | |
1c4f3631 | 3466 | } |
a3ad94ed | 3467 | |
16649710 ILT |
3468 | Output_data_dynamic* const odyn = this->dynamic_data_; |
3469 | ||
a3ad94ed ILT |
3470 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
3471 | p != input_objects->dynobj_end(); | |
3472 | ++p) | |
3473 | { | |
594c8e5e ILT |
3474 | if (!(*p)->is_needed() |
3475 | && (*p)->input_file()->options().as_needed()) | |
3476 | { | |
3477 | // This dynamic object was linked with --as-needed, but it | |
3478 | // is not needed. | |
3479 | continue; | |
3480 | } | |
3481 | ||
a3ad94ed ILT |
3482 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); |
3483 | } | |
3484 | ||
8851ecca | 3485 | if (parameters->options().shared()) |
fced7afd | 3486 | { |
e55bde5e | 3487 | const char* soname = parameters->options().soname(); |
fced7afd ILT |
3488 | if (soname != NULL) |
3489 | odyn->add_string(elfcpp::DT_SONAME, soname); | |
3490 | } | |
3491 | ||
c6585162 | 3492 | Symbol* sym = symtab->lookup(parameters->options().init()); |
14b31740 | 3493 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
3494 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
3495 | ||
c6585162 | 3496 | sym = symtab->lookup(parameters->options().fini()); |
14b31740 | 3497 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
3498 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
3499 | ||
f15f61a7 DK |
3500 | // Look for .init_array, .preinit_array and .fini_array by checking |
3501 | // section types. | |
3502 | for(Layout::Section_list::const_iterator p = this->section_list_.begin(); | |
3503 | p != this->section_list_.end(); | |
3504 | ++p) | |
3505 | switch((*p)->type()) | |
3506 | { | |
3507 | case elfcpp::SHT_FINI_ARRAY: | |
3508 | odyn->add_section_address(elfcpp::DT_FINI_ARRAY, *p); | |
3509 | odyn->add_section_size(elfcpp::DT_FINI_ARRAYSZ, *p); | |
3510 | break; | |
3511 | case elfcpp::SHT_INIT_ARRAY: | |
3512 | odyn->add_section_address(elfcpp::DT_INIT_ARRAY, *p); | |
3513 | odyn->add_section_size(elfcpp::DT_INIT_ARRAYSZ, *p); | |
3514 | break; | |
3515 | case elfcpp::SHT_PREINIT_ARRAY: | |
3516 | odyn->add_section_address(elfcpp::DT_PREINIT_ARRAY, *p); | |
3517 | odyn->add_section_size(elfcpp::DT_PREINIT_ARRAYSZ, *p); | |
3518 | break; | |
3519 | default: | |
3520 | break; | |
3521 | } | |
3522 | ||
41f542e7 | 3523 | // Add a DT_RPATH entry if needed. |
e55bde5e | 3524 | const General_options::Dir_list& rpath(parameters->options().rpath()); |
41f542e7 ILT |
3525 | if (!rpath.empty()) |
3526 | { | |
3527 | std::string rpath_val; | |
3528 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
3529 | p != rpath.end(); | |
3530 | ++p) | |
3531 | { | |
3532 | if (rpath_val.empty()) | |
ad2d6943 | 3533 | rpath_val = p->name(); |
41f542e7 ILT |
3534 | else |
3535 | { | |
3536 | // Eliminate duplicates. | |
3537 | General_options::Dir_list::const_iterator q; | |
3538 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 3539 | if (q->name() == p->name()) |
41f542e7 ILT |
3540 | break; |
3541 | if (q == p) | |
3542 | { | |
3543 | rpath_val += ':'; | |
ad2d6943 | 3544 | rpath_val += p->name(); |
41f542e7 ILT |
3545 | } |
3546 | } | |
3547 | } | |
3548 | ||
3549 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
7c414435 DM |
3550 | if (parameters->options().enable_new_dtags()) |
3551 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); | |
41f542e7 | 3552 | } |
4f4c5f80 ILT |
3553 | |
3554 | // Look for text segments that have dynamic relocations. | |
3555 | bool have_textrel = false; | |
4e8fe71f | 3556 | if (!this->script_options_->saw_sections_clause()) |
4f4c5f80 | 3557 | { |
4e8fe71f ILT |
3558 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
3559 | p != this->segment_list_.end(); | |
3560 | ++p) | |
3561 | { | |
3562 | if (((*p)->flags() & elfcpp::PF_W) == 0 | |
3563 | && (*p)->dynamic_reloc_count() > 0) | |
3564 | { | |
3565 | have_textrel = true; | |
3566 | break; | |
3567 | } | |
3568 | } | |
3569 | } | |
3570 | else | |
3571 | { | |
3572 | // We don't know the section -> segment mapping, so we are | |
3573 | // conservative and just look for readonly sections with | |
3574 | // relocations. If those sections wind up in writable segments, | |
3575 | // then we have created an unnecessary DT_TEXTREL entry. | |
3576 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3577 | p != this->section_list_.end(); | |
3578 | ++p) | |
3579 | { | |
3580 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 | |
3581 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 | |
3582 | && ((*p)->dynamic_reloc_count() > 0)) | |
3583 | { | |
3584 | have_textrel = true; | |
3585 | break; | |
3586 | } | |
3587 | } | |
4f4c5f80 ILT |
3588 | } |
3589 | ||
3590 | // Add a DT_FLAGS entry. We add it even if no flags are set so that | |
3591 | // post-link tools can easily modify these flags if desired. | |
3592 | unsigned int flags = 0; | |
3593 | if (have_textrel) | |
6a41d30b ILT |
3594 | { |
3595 | // Add a DT_TEXTREL for compatibility with older loaders. | |
3596 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
3597 | flags |= elfcpp::DF_TEXTREL; | |
b9674e17 | 3598 | |
ffeef7df ILT |
3599 | if (parameters->options().text()) |
3600 | gold_error(_("read-only segment has dynamic relocations")); | |
3601 | else if (parameters->options().warn_shared_textrel() | |
3602 | && parameters->options().shared()) | |
b9674e17 | 3603 | gold_warning(_("shared library text segment is not shareable")); |
6a41d30b | 3604 | } |
8851ecca | 3605 | if (parameters->options().shared() && this->has_static_tls()) |
535890bb | 3606 | flags |= elfcpp::DF_STATIC_TLS; |
7be8330a CD |
3607 | if (parameters->options().origin()) |
3608 | flags |= elfcpp::DF_ORIGIN; | |
f15f61a7 DK |
3609 | if (parameters->options().Bsymbolic()) |
3610 | { | |
3611 | flags |= elfcpp::DF_SYMBOLIC; | |
3612 | // Add DT_SYMBOLIC for compatibility with older loaders. | |
3613 | odyn->add_constant(elfcpp::DT_SYMBOLIC, 0); | |
3614 | } | |
e1c74d60 ILT |
3615 | if (parameters->options().now()) |
3616 | flags |= elfcpp::DF_BIND_NOW; | |
4f4c5f80 | 3617 | odyn->add_constant(elfcpp::DT_FLAGS, flags); |
7c414435 DM |
3618 | |
3619 | flags = 0; | |
3620 | if (parameters->options().initfirst()) | |
3621 | flags |= elfcpp::DF_1_INITFIRST; | |
3622 | if (parameters->options().interpose()) | |
3623 | flags |= elfcpp::DF_1_INTERPOSE; | |
3624 | if (parameters->options().loadfltr()) | |
3625 | flags |= elfcpp::DF_1_LOADFLTR; | |
3626 | if (parameters->options().nodefaultlib()) | |
3627 | flags |= elfcpp::DF_1_NODEFLIB; | |
3628 | if (parameters->options().nodelete()) | |
3629 | flags |= elfcpp::DF_1_NODELETE; | |
3630 | if (parameters->options().nodlopen()) | |
3631 | flags |= elfcpp::DF_1_NOOPEN; | |
3632 | if (parameters->options().nodump()) | |
3633 | flags |= elfcpp::DF_1_NODUMP; | |
3634 | if (!parameters->options().shared()) | |
3635 | flags &= ~(elfcpp::DF_1_INITFIRST | |
3636 | | elfcpp::DF_1_NODELETE | |
3637 | | elfcpp::DF_1_NOOPEN); | |
7be8330a CD |
3638 | if (parameters->options().origin()) |
3639 | flags |= elfcpp::DF_1_ORIGIN; | |
e1c74d60 ILT |
3640 | if (parameters->options().now()) |
3641 | flags |= elfcpp::DF_1_NOW; | |
7c414435 DM |
3642 | if (flags) |
3643 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); | |
a3ad94ed ILT |
3644 | } |
3645 | ||
f0ba79e2 ILT |
3646 | // Set the size of the _DYNAMIC symbol table to be the size of the |
3647 | // dynamic data. | |
3648 | ||
3649 | void | |
3650 | Layout::set_dynamic_symbol_size(const Symbol_table* symtab) | |
3651 | { | |
3652 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
3653 | odyn->finalize_data_size(); | |
3654 | off_t data_size = odyn->data_size(); | |
3655 | const int size = parameters->target().get_size(); | |
3656 | if (size == 32) | |
3657 | symtab->get_sized_symbol<32>(this->dynamic_symbol_)->set_symsize(data_size); | |
3658 | else if (size == 64) | |
3659 | symtab->get_sized_symbol<64>(this->dynamic_symbol_)->set_symsize(data_size); | |
3660 | else | |
3661 | gold_unreachable(); | |
3662 | } | |
3663 | ||
dff16297 ILT |
3664 | // The mapping of input section name prefixes to output section names. |
3665 | // In some cases one prefix is itself a prefix of another prefix; in | |
3666 | // such a case the longer prefix must come first. These prefixes are | |
3667 | // based on the GNU linker default ELF linker script. | |
a2fb1b05 | 3668 | |
ead1e424 | 3669 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
dff16297 | 3670 | const Layout::Section_name_mapping Layout::section_name_mapping[] = |
a2fb1b05 | 3671 | { |
dff16297 ILT |
3672 | MAPPING_INIT(".text.", ".text"), |
3673 | MAPPING_INIT(".ctors.", ".ctors"), | |
3674 | MAPPING_INIT(".dtors.", ".dtors"), | |
3675 | MAPPING_INIT(".rodata.", ".rodata"), | |
3676 | MAPPING_INIT(".data.rel.ro.local", ".data.rel.ro.local"), | |
3677 | MAPPING_INIT(".data.rel.ro", ".data.rel.ro"), | |
3678 | MAPPING_INIT(".data.", ".data"), | |
3679 | MAPPING_INIT(".bss.", ".bss"), | |
3680 | MAPPING_INIT(".tdata.", ".tdata"), | |
3681 | MAPPING_INIT(".tbss.", ".tbss"), | |
3682 | MAPPING_INIT(".init_array.", ".init_array"), | |
3683 | MAPPING_INIT(".fini_array.", ".fini_array"), | |
3684 | MAPPING_INIT(".sdata.", ".sdata"), | |
3685 | MAPPING_INIT(".sbss.", ".sbss"), | |
3686 | // FIXME: In the GNU linker, .sbss2 and .sdata2 are handled | |
3687 | // differently depending on whether it is creating a shared library. | |
3688 | MAPPING_INIT(".sdata2.", ".sdata"), | |
3689 | MAPPING_INIT(".sbss2.", ".sbss"), | |
3690 | MAPPING_INIT(".lrodata.", ".lrodata"), | |
3691 | MAPPING_INIT(".ldata.", ".ldata"), | |
3692 | MAPPING_INIT(".lbss.", ".lbss"), | |
3693 | MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"), | |
3694 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"), | |
3695 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"), | |
3696 | MAPPING_INIT(".gnu.linkonce.t.", ".text"), | |
3697 | MAPPING_INIT(".gnu.linkonce.r.", ".rodata"), | |
3698 | MAPPING_INIT(".gnu.linkonce.d.", ".data"), | |
3699 | MAPPING_INIT(".gnu.linkonce.b.", ".bss"), | |
3700 | MAPPING_INIT(".gnu.linkonce.s.", ".sdata"), | |
3701 | MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"), | |
3702 | MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"), | |
3703 | MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"), | |
3704 | MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"), | |
3705 | MAPPING_INIT(".gnu.linkonce.td.", ".tdata"), | |
3706 | MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"), | |
3707 | MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"), | |
3708 | MAPPING_INIT(".gnu.linkonce.l.", ".ldata"), | |
3709 | MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"), | |
4a54abbb | 3710 | MAPPING_INIT(".ARM.extab", ".ARM.extab"), |
1dcd334d | 3711 | MAPPING_INIT(".gnu.linkonce.armextab.", ".ARM.extab"), |
4a54abbb | 3712 | MAPPING_INIT(".ARM.exidx", ".ARM.exidx"), |
1dcd334d | 3713 | MAPPING_INIT(".gnu.linkonce.armexidx.", ".ARM.exidx"), |
a2fb1b05 ILT |
3714 | }; |
3715 | #undef MAPPING_INIT | |
3716 | ||
dff16297 ILT |
3717 | const int Layout::section_name_mapping_count = |
3718 | (sizeof(Layout::section_name_mapping) | |
3719 | / sizeof(Layout::section_name_mapping[0])); | |
a2fb1b05 | 3720 | |
ead1e424 ILT |
3721 | // Choose the output section name to use given an input section name. |
3722 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
3723 | // length of NAME. | |
3724 | ||
3725 | const char* | |
3726 | Layout::output_section_name(const char* name, size_t* plen) | |
3727 | { | |
af4a8a83 ILT |
3728 | // gcc 4.3 generates the following sorts of section names when it |
3729 | // needs a section name specific to a function: | |
3730 | // .text.FN | |
3731 | // .rodata.FN | |
3732 | // .sdata2.FN | |
3733 | // .data.FN | |
3734 | // .data.rel.FN | |
3735 | // .data.rel.local.FN | |
3736 | // .data.rel.ro.FN | |
3737 | // .data.rel.ro.local.FN | |
3738 | // .sdata.FN | |
3739 | // .bss.FN | |
3740 | // .sbss.FN | |
3741 | // .tdata.FN | |
3742 | // .tbss.FN | |
3743 | ||
3744 | // The GNU linker maps all of those to the part before the .FN, | |
3745 | // except that .data.rel.local.FN is mapped to .data, and | |
3746 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
3747 | // beginning with .data.rel.ro.local are grouped together. | |
3748 | ||
3749 | // For an anonymous namespace, the string FN can contain a '.'. | |
3750 | ||
3751 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
3752 | // GNU linker maps to .rodata. | |
3753 | ||
dff16297 ILT |
3754 | // The .data.rel.ro sections are used with -z relro. The sections |
3755 | // are recognized by name. We use the same names that the GNU | |
3756 | // linker does for these sections. | |
af4a8a83 | 3757 | |
dff16297 ILT |
3758 | // It is hard to handle this in a principled way, so we don't even |
3759 | // try. We use a table of mappings. If the input section name is | |
3760 | // not found in the table, we simply use it as the output section | |
3761 | // name. | |
af4a8a83 | 3762 | |
dff16297 ILT |
3763 | const Section_name_mapping* psnm = section_name_mapping; |
3764 | for (int i = 0; i < section_name_mapping_count; ++i, ++psnm) | |
ead1e424 | 3765 | { |
dff16297 ILT |
3766 | if (strncmp(name, psnm->from, psnm->fromlen) == 0) |
3767 | { | |
3768 | *plen = psnm->tolen; | |
3769 | return psnm->to; | |
3770 | } | |
ead1e424 ILT |
3771 | } |
3772 | ||
ead1e424 ILT |
3773 | return name; |
3774 | } | |
3775 | ||
8a4c0b0d ILT |
3776 | // Check if a comdat group or .gnu.linkonce section with the given |
3777 | // NAME is selected for the link. If there is already a section, | |
1ef4d87f ILT |
3778 | // *KEPT_SECTION is set to point to the existing section and the |
3779 | // function returns false. Otherwise, OBJECT, SHNDX, IS_COMDAT, and | |
3780 | // IS_GROUP_NAME are recorded for this NAME in the layout object, | |
3781 | // *KEPT_SECTION is set to the internal copy and the function returns | |
3782 | // true. | |
a2fb1b05 ILT |
3783 | |
3784 | bool | |
e55bde5e | 3785 | Layout::find_or_add_kept_section(const std::string& name, |
1ef4d87f ILT |
3786 | Relobj* object, |
3787 | unsigned int shndx, | |
3788 | bool is_comdat, | |
3789 | bool is_group_name, | |
8a4c0b0d | 3790 | Kept_section** kept_section) |
a2fb1b05 | 3791 | { |
e55bde5e ILT |
3792 | // It's normal to see a couple of entries here, for the x86 thunk |
3793 | // sections. If we see more than a few, we're linking a C++ | |
3794 | // program, and we resize to get more space to minimize rehashing. | |
3795 | if (this->signatures_.size() > 4 | |
3796 | && !this->resized_signatures_) | |
3797 | { | |
3798 | reserve_unordered_map(&this->signatures_, | |
3799 | this->number_of_input_files_ * 64); | |
3800 | this->resized_signatures_ = true; | |
3801 | } | |
3802 | ||
1ef4d87f ILT |
3803 | Kept_section candidate; |
3804 | std::pair<Signatures::iterator, bool> ins = | |
3805 | this->signatures_.insert(std::make_pair(name, candidate)); | |
a2fb1b05 | 3806 | |
1ef4d87f | 3807 | if (kept_section != NULL) |
8a4c0b0d | 3808 | *kept_section = &ins.first->second; |
a2fb1b05 ILT |
3809 | if (ins.second) |
3810 | { | |
3811 | // This is the first time we've seen this signature. | |
1ef4d87f ILT |
3812 | ins.first->second.set_object(object); |
3813 | ins.first->second.set_shndx(shndx); | |
3814 | if (is_comdat) | |
3815 | ins.first->second.set_is_comdat(); | |
3816 | if (is_group_name) | |
3817 | ins.first->second.set_is_group_name(); | |
a2fb1b05 ILT |
3818 | return true; |
3819 | } | |
3820 | ||
1ef4d87f ILT |
3821 | // We have already seen this signature. |
3822 | ||
3823 | if (ins.first->second.is_group_name()) | |
a2fb1b05 ILT |
3824 | { |
3825 | // We've already seen a real section group with this signature. | |
1ef4d87f ILT |
3826 | // If the kept group is from a plugin object, and we're in the |
3827 | // replacement phase, accept the new one as a replacement. | |
3828 | if (ins.first->second.object() == NULL | |
2756a258 CC |
3829 | && parameters->options().plugins()->in_replacement_phase()) |
3830 | { | |
1ef4d87f ILT |
3831 | ins.first->second.set_object(object); |
3832 | ins.first->second.set_shndx(shndx); | |
2756a258 CC |
3833 | return true; |
3834 | } | |
a2fb1b05 ILT |
3835 | return false; |
3836 | } | |
1ef4d87f | 3837 | else if (is_group_name) |
a2fb1b05 ILT |
3838 | { |
3839 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 3840 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 | 3841 | // a section group, and don't include this section group. |
1ef4d87f | 3842 | ins.first->second.set_is_group_name(); |
a2fb1b05 ILT |
3843 | return false; |
3844 | } | |
3845 | else | |
3846 | { | |
3847 | // We've already seen a linkonce section and this is a linkonce | |
3848 | // section. These don't block each other--this may be the same | |
3849 | // symbol name with different section types. | |
3850 | return true; | |
3851 | } | |
3852 | } | |
3853 | ||
a445fddf ILT |
3854 | // Store the allocated sections into the section list. |
3855 | ||
3856 | void | |
2ea97941 | 3857 | Layout::get_allocated_sections(Section_list* section_list) const |
a445fddf ILT |
3858 | { |
3859 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3860 | p != this->section_list_.end(); | |
3861 | ++p) | |
3862 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) | |
2ea97941 | 3863 | section_list->push_back(*p); |
a445fddf ILT |
3864 | } |
3865 | ||
3866 | // Create an output segment. | |
3867 | ||
3868 | Output_segment* | |
3869 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
3870 | { | |
8851ecca | 3871 | gold_assert(!parameters->options().relocatable()); |
a445fddf ILT |
3872 | Output_segment* oseg = new Output_segment(type, flags); |
3873 | this->segment_list_.push_back(oseg); | |
2d924fd9 ILT |
3874 | |
3875 | if (type == elfcpp::PT_TLS) | |
3876 | this->tls_segment_ = oseg; | |
3877 | else if (type == elfcpp::PT_GNU_RELRO) | |
3878 | this->relro_segment_ = oseg; | |
3879 | ||
a445fddf ILT |
3880 | return oseg; |
3881 | } | |
3882 | ||
730cdc88 ILT |
3883 | // Write out the Output_sections. Most won't have anything to write, |
3884 | // since most of the data will come from input sections which are | |
3885 | // handled elsewhere. But some Output_sections do have Output_data. | |
3886 | ||
3887 | void | |
3888 | Layout::write_output_sections(Output_file* of) const | |
3889 | { | |
3890 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3891 | p != this->section_list_.end(); | |
3892 | ++p) | |
3893 | { | |
3894 | if (!(*p)->after_input_sections()) | |
3895 | (*p)->write(of); | |
3896 | } | |
3897 | } | |
3898 | ||
61ba1cf9 ILT |
3899 | // Write out data not associated with a section or the symbol table. |
3900 | ||
3901 | void | |
9025d29d | 3902 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 3903 | { |
8851ecca | 3904 | if (!parameters->options().strip_all()) |
a3ad94ed | 3905 | { |
2ea97941 | 3906 | const Output_section* symtab_section = this->symtab_section_; |
9e2dcb77 ILT |
3907 | for (Section_list::const_iterator p = this->section_list_.begin(); |
3908 | p != this->section_list_.end(); | |
3909 | ++p) | |
a3ad94ed | 3910 | { |
9e2dcb77 ILT |
3911 | if ((*p)->needs_symtab_index()) |
3912 | { | |
2ea97941 | 3913 | gold_assert(symtab_section != NULL); |
9e2dcb77 ILT |
3914 | unsigned int index = (*p)->symtab_index(); |
3915 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
3916 | off_t off = (symtab_section->offset() |
3917 | + index * symtab_section->entsize()); | |
d491d34e | 3918 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
9e2dcb77 | 3919 | } |
a3ad94ed ILT |
3920 | } |
3921 | } | |
3922 | ||
2ea97941 | 3923 | const Output_section* dynsym_section = this->dynsym_section_; |
a3ad94ed ILT |
3924 | for (Section_list::const_iterator p = this->section_list_.begin(); |
3925 | p != this->section_list_.end(); | |
3926 | ++p) | |
3927 | { | |
3928 | if ((*p)->needs_dynsym_index()) | |
3929 | { | |
2ea97941 | 3930 | gold_assert(dynsym_section != NULL); |
a3ad94ed ILT |
3931 | unsigned int index = (*p)->dynsym_index(); |
3932 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
3933 | off_t off = (dynsym_section->offset() |
3934 | + index * dynsym_section->entsize()); | |
d491d34e | 3935 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
a3ad94ed ILT |
3936 | } |
3937 | } | |
3938 | ||
a3ad94ed | 3939 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
3940 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
3941 | p != this->special_output_list_.end(); | |
3942 | ++p) | |
3943 | (*p)->write(of); | |
3944 | } | |
3945 | ||
730cdc88 ILT |
3946 | // Write out the Output_sections which can only be written after the |
3947 | // input sections are complete. | |
3948 | ||
3949 | void | |
27bc2bce | 3950 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 3951 | { |
27bc2bce | 3952 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
3953 | // file size. Note we finalize the .shstrab last, to allow the |
3954 | // after_input_section sections to modify their section-names before | |
3955 | // writing. | |
17a1d0a9 | 3956 | if (this->any_postprocessing_sections_) |
27bc2bce | 3957 | { |
17a1d0a9 ILT |
3958 | off_t off = this->output_file_size_; |
3959 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); | |
8a4c0b0d | 3960 | |
17a1d0a9 ILT |
3961 | // Now that we've finalized the names, we can finalize the shstrab. |
3962 | off = | |
3963 | this->set_section_offsets(off, | |
3964 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
3965 | ||
3966 | if (off > this->output_file_size_) | |
3967 | { | |
3968 | of->resize(off); | |
3969 | this->output_file_size_ = off; | |
3970 | } | |
27bc2bce ILT |
3971 | } |
3972 | ||
730cdc88 ILT |
3973 | for (Section_list::const_iterator p = this->section_list_.begin(); |
3974 | p != this->section_list_.end(); | |
3975 | ++p) | |
3976 | { | |
3977 | if ((*p)->after_input_sections()) | |
3978 | (*p)->write(of); | |
3979 | } | |
27bc2bce | 3980 | |
27bc2bce | 3981 | this->section_headers_->write(of); |
730cdc88 ILT |
3982 | } |
3983 | ||
8ed814a9 ILT |
3984 | // If the build ID requires computing a checksum, do so here, and |
3985 | // write it out. We compute a checksum over the entire file because | |
3986 | // that is simplest. | |
3987 | ||
3988 | void | |
3989 | Layout::write_build_id(Output_file* of) const | |
3990 | { | |
3991 | if (this->build_id_note_ == NULL) | |
3992 | return; | |
3993 | ||
3994 | const unsigned char* iv = of->get_input_view(0, this->output_file_size_); | |
3995 | ||
3996 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), | |
3997 | this->build_id_note_->data_size()); | |
3998 | ||
3999 | const char* style = parameters->options().build_id(); | |
4000 | if (strcmp(style, "sha1") == 0) | |
4001 | { | |
4002 | sha1_ctx ctx; | |
4003 | sha1_init_ctx(&ctx); | |
4004 | sha1_process_bytes(iv, this->output_file_size_, &ctx); | |
4005 | sha1_finish_ctx(&ctx, ov); | |
4006 | } | |
4007 | else if (strcmp(style, "md5") == 0) | |
4008 | { | |
4009 | md5_ctx ctx; | |
4010 | md5_init_ctx(&ctx); | |
4011 | md5_process_bytes(iv, this->output_file_size_, &ctx); | |
4012 | md5_finish_ctx(&ctx, ov); | |
4013 | } | |
4014 | else | |
4015 | gold_unreachable(); | |
4016 | ||
4017 | of->write_output_view(this->build_id_note_->offset(), | |
4018 | this->build_id_note_->data_size(), | |
4019 | ov); | |
4020 | ||
4021 | of->free_input_view(0, this->output_file_size_, iv); | |
4022 | } | |
4023 | ||
516cb3d0 ILT |
4024 | // Write out a binary file. This is called after the link is |
4025 | // complete. IN is the temporary output file we used to generate the | |
4026 | // ELF code. We simply walk through the segments, read them from | |
4027 | // their file offset in IN, and write them to their load address in | |
4028 | // the output file. FIXME: with a bit more work, we could support | |
4029 | // S-records and/or Intel hex format here. | |
4030 | ||
4031 | void | |
4032 | Layout::write_binary(Output_file* in) const | |
4033 | { | |
e55bde5e | 4034 | gold_assert(parameters->options().oformat_enum() |
bc644c6c | 4035 | == General_options::OBJECT_FORMAT_BINARY); |
516cb3d0 ILT |
4036 | |
4037 | // Get the size of the binary file. | |
4038 | uint64_t max_load_address = 0; | |
4039 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4040 | p != this->segment_list_.end(); | |
4041 | ++p) | |
4042 | { | |
4043 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
4044 | { | |
4045 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); | |
4046 | if (max_paddr > max_load_address) | |
4047 | max_load_address = max_paddr; | |
4048 | } | |
4049 | } | |
4050 | ||
8851ecca | 4051 | Output_file out(parameters->options().output_file_name()); |
516cb3d0 ILT |
4052 | out.open(max_load_address); |
4053 | ||
4054 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4055 | p != this->segment_list_.end(); | |
4056 | ++p) | |
4057 | { | |
4058 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
4059 | { | |
4060 | const unsigned char* vin = in->get_input_view((*p)->offset(), | |
4061 | (*p)->filesz()); | |
4062 | unsigned char* vout = out.get_output_view((*p)->paddr(), | |
4063 | (*p)->filesz()); | |
4064 | memcpy(vout, vin, (*p)->filesz()); | |
4065 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); | |
4066 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); | |
4067 | } | |
4068 | } | |
4069 | ||
4070 | out.close(); | |
4071 | } | |
4072 | ||
7d9e3d98 ILT |
4073 | // Print the output sections to the map file. |
4074 | ||
4075 | void | |
4076 | Layout::print_to_mapfile(Mapfile* mapfile) const | |
4077 | { | |
4078 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4079 | p != this->segment_list_.end(); | |
4080 | ++p) | |
4081 | (*p)->print_sections_to_mapfile(mapfile); | |
4082 | } | |
4083 | ||
ad8f37d1 ILT |
4084 | // Print statistical information to stderr. This is used for --stats. |
4085 | ||
4086 | void | |
4087 | Layout::print_stats() const | |
4088 | { | |
4089 | this->namepool_.print_stats("section name pool"); | |
4090 | this->sympool_.print_stats("output symbol name pool"); | |
4091 | this->dynpool_.print_stats("dynamic name pool"); | |
38c5e8b4 ILT |
4092 | |
4093 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
4094 | p != this->section_list_.end(); | |
4095 | ++p) | |
4096 | (*p)->print_merge_stats(); | |
ad8f37d1 ILT |
4097 | } |
4098 | ||
730cdc88 ILT |
4099 | // Write_sections_task methods. |
4100 | ||
4101 | // We can always run this task. | |
4102 | ||
17a1d0a9 ILT |
4103 | Task_token* |
4104 | Write_sections_task::is_runnable() | |
730cdc88 | 4105 | { |
17a1d0a9 | 4106 | return NULL; |
730cdc88 ILT |
4107 | } |
4108 | ||
4109 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
4110 | // when finished. | |
4111 | ||
17a1d0a9 ILT |
4112 | void |
4113 | Write_sections_task::locks(Task_locker* tl) | |
730cdc88 | 4114 | { |
17a1d0a9 ILT |
4115 | tl->add(this, this->output_sections_blocker_); |
4116 | tl->add(this, this->final_blocker_); | |
730cdc88 ILT |
4117 | } |
4118 | ||
4119 | // Run the task--write out the data. | |
4120 | ||
4121 | void | |
4122 | Write_sections_task::run(Workqueue*) | |
4123 | { | |
4124 | this->layout_->write_output_sections(this->of_); | |
4125 | } | |
4126 | ||
61ba1cf9 ILT |
4127 | // Write_data_task methods. |
4128 | ||
4129 | // We can always run this task. | |
4130 | ||
17a1d0a9 ILT |
4131 | Task_token* |
4132 | Write_data_task::is_runnable() | |
61ba1cf9 | 4133 | { |
17a1d0a9 | 4134 | return NULL; |
61ba1cf9 ILT |
4135 | } |
4136 | ||
4137 | // We need to unlock FINAL_BLOCKER when finished. | |
4138 | ||
17a1d0a9 ILT |
4139 | void |
4140 | Write_data_task::locks(Task_locker* tl) | |
61ba1cf9 | 4141 | { |
17a1d0a9 | 4142 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
4143 | } |
4144 | ||
4145 | // Run the task--write out the data. | |
4146 | ||
4147 | void | |
4148 | Write_data_task::run(Workqueue*) | |
4149 | { | |
9025d29d | 4150 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
4151 | } |
4152 | ||
4153 | // Write_symbols_task methods. | |
4154 | ||
4155 | // We can always run this task. | |
4156 | ||
17a1d0a9 ILT |
4157 | Task_token* |
4158 | Write_symbols_task::is_runnable() | |
61ba1cf9 | 4159 | { |
17a1d0a9 | 4160 | return NULL; |
61ba1cf9 ILT |
4161 | } |
4162 | ||
4163 | // We need to unlock FINAL_BLOCKER when finished. | |
4164 | ||
17a1d0a9 ILT |
4165 | void |
4166 | Write_symbols_task::locks(Task_locker* tl) | |
61ba1cf9 | 4167 | { |
17a1d0a9 | 4168 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
4169 | } |
4170 | ||
4171 | // Run the task--write out the symbols. | |
4172 | ||
4173 | void | |
4174 | Write_symbols_task::run(Workqueue*) | |
4175 | { | |
fd9d194f ILT |
4176 | this->symtab_->write_globals(this->sympool_, this->dynpool_, |
4177 | this->layout_->symtab_xindex(), | |
d491d34e | 4178 | this->layout_->dynsym_xindex(), this->of_); |
61ba1cf9 ILT |
4179 | } |
4180 | ||
730cdc88 ILT |
4181 | // Write_after_input_sections_task methods. |
4182 | ||
4183 | // We can only run this task after the input sections have completed. | |
4184 | ||
17a1d0a9 ILT |
4185 | Task_token* |
4186 | Write_after_input_sections_task::is_runnable() | |
730cdc88 ILT |
4187 | { |
4188 | if (this->input_sections_blocker_->is_blocked()) | |
17a1d0a9 ILT |
4189 | return this->input_sections_blocker_; |
4190 | return NULL; | |
730cdc88 ILT |
4191 | } |
4192 | ||
4193 | // We need to unlock FINAL_BLOCKER when finished. | |
4194 | ||
17a1d0a9 ILT |
4195 | void |
4196 | Write_after_input_sections_task::locks(Task_locker* tl) | |
730cdc88 | 4197 | { |
17a1d0a9 | 4198 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
4199 | } |
4200 | ||
4201 | // Run the task. | |
4202 | ||
4203 | void | |
4204 | Write_after_input_sections_task::run(Workqueue*) | |
4205 | { | |
4206 | this->layout_->write_sections_after_input_sections(this->of_); | |
4207 | } | |
4208 | ||
92e059d8 | 4209 | // Close_task_runner methods. |
61ba1cf9 ILT |
4210 | |
4211 | // Run the task--close the file. | |
4212 | ||
4213 | void | |
17a1d0a9 | 4214 | Close_task_runner::run(Workqueue*, const Task*) |
61ba1cf9 | 4215 | { |
8ed814a9 ILT |
4216 | // If we need to compute a checksum for the BUILD if, we do so here. |
4217 | this->layout_->write_build_id(this->of_); | |
4218 | ||
516cb3d0 | 4219 | // If we've been asked to create a binary file, we do so here. |
7cc619c3 | 4220 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
4221 | this->layout_->write_binary(this->of_); |
4222 | ||
61ba1cf9 ILT |
4223 | this->of_->close(); |
4224 | } | |
4225 | ||
a2fb1b05 ILT |
4226 | // Instantiate the templates we need. We could use the configure |
4227 | // script to restrict this to only the ones for implemented targets. | |
4228 | ||
193a53d9 | 4229 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 ILT |
4230 | template |
4231 | Output_section* | |
730cdc88 ILT |
4232 | Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx, |
4233 | const char* name, | |
4234 | const elfcpp::Shdr<32, false>& shdr, | |
4235 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 4236 | #endif |
a2fb1b05 | 4237 | |
193a53d9 | 4238 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
4239 | template |
4240 | Output_section* | |
730cdc88 ILT |
4241 | Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx, |
4242 | const char* name, | |
4243 | const elfcpp::Shdr<32, true>& shdr, | |
4244 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 4245 | #endif |
a2fb1b05 | 4246 | |
193a53d9 | 4247 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
4248 | template |
4249 | Output_section* | |
730cdc88 ILT |
4250 | Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx, |
4251 | const char* name, | |
4252 | const elfcpp::Shdr<64, false>& shdr, | |
4253 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 4254 | #endif |
a2fb1b05 | 4255 | |
193a53d9 | 4256 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
4257 | template |
4258 | Output_section* | |
730cdc88 ILT |
4259 | Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx, |
4260 | const char* name, | |
4261 | const elfcpp::Shdr<64, true>& shdr, | |
4262 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 4263 | #endif |
a2fb1b05 | 4264 | |
6a74a719 ILT |
4265 | #ifdef HAVE_TARGET_32_LITTLE |
4266 | template | |
4267 | Output_section* | |
4268 | Layout::layout_reloc<32, false>(Sized_relobj<32, false>* object, | |
4269 | unsigned int reloc_shndx, | |
4270 | const elfcpp::Shdr<32, false>& shdr, | |
4271 | Output_section* data_section, | |
4272 | Relocatable_relocs* rr); | |
4273 | #endif | |
4274 | ||
4275 | #ifdef HAVE_TARGET_32_BIG | |
4276 | template | |
4277 | Output_section* | |
4278 | Layout::layout_reloc<32, true>(Sized_relobj<32, true>* object, | |
4279 | unsigned int reloc_shndx, | |
4280 | const elfcpp::Shdr<32, true>& shdr, | |
4281 | Output_section* data_section, | |
4282 | Relocatable_relocs* rr); | |
4283 | #endif | |
4284 | ||
4285 | #ifdef HAVE_TARGET_64_LITTLE | |
4286 | template | |
4287 | Output_section* | |
4288 | Layout::layout_reloc<64, false>(Sized_relobj<64, false>* object, | |
4289 | unsigned int reloc_shndx, | |
4290 | const elfcpp::Shdr<64, false>& shdr, | |
4291 | Output_section* data_section, | |
4292 | Relocatable_relocs* rr); | |
4293 | #endif | |
4294 | ||
4295 | #ifdef HAVE_TARGET_64_BIG | |
4296 | template | |
4297 | Output_section* | |
4298 | Layout::layout_reloc<64, true>(Sized_relobj<64, true>* object, | |
4299 | unsigned int reloc_shndx, | |
4300 | const elfcpp::Shdr<64, true>& shdr, | |
4301 | Output_section* data_section, | |
4302 | Relocatable_relocs* rr); | |
4303 | #endif | |
4304 | ||
4305 | #ifdef HAVE_TARGET_32_LITTLE | |
4306 | template | |
4307 | void | |
4308 | Layout::layout_group<32, false>(Symbol_table* symtab, | |
4309 | Sized_relobj<32, false>* object, | |
4310 | unsigned int, | |
4311 | const char* group_section_name, | |
4312 | const char* signature, | |
4313 | const elfcpp::Shdr<32, false>& shdr, | |
8825ac63 ILT |
4314 | elfcpp::Elf_Word flags, |
4315 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
4316 | #endif |
4317 | ||
4318 | #ifdef HAVE_TARGET_32_BIG | |
4319 | template | |
4320 | void | |
4321 | Layout::layout_group<32, true>(Symbol_table* symtab, | |
4322 | Sized_relobj<32, true>* object, | |
4323 | unsigned int, | |
4324 | const char* group_section_name, | |
4325 | const char* signature, | |
4326 | const elfcpp::Shdr<32, true>& shdr, | |
8825ac63 ILT |
4327 | elfcpp::Elf_Word flags, |
4328 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
4329 | #endif |
4330 | ||
4331 | #ifdef HAVE_TARGET_64_LITTLE | |
4332 | template | |
4333 | void | |
4334 | Layout::layout_group<64, false>(Symbol_table* symtab, | |
4335 | Sized_relobj<64, false>* object, | |
4336 | unsigned int, | |
4337 | const char* group_section_name, | |
4338 | const char* signature, | |
4339 | const elfcpp::Shdr<64, false>& shdr, | |
8825ac63 ILT |
4340 | elfcpp::Elf_Word flags, |
4341 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
4342 | #endif |
4343 | ||
4344 | #ifdef HAVE_TARGET_64_BIG | |
4345 | template | |
4346 | void | |
4347 | Layout::layout_group<64, true>(Symbol_table* symtab, | |
4348 | Sized_relobj<64, true>* object, | |
4349 | unsigned int, | |
4350 | const char* group_section_name, | |
4351 | const char* signature, | |
4352 | const elfcpp::Shdr<64, true>& shdr, | |
8825ac63 ILT |
4353 | elfcpp::Elf_Word flags, |
4354 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
4355 | #endif |
4356 | ||
730cdc88 ILT |
4357 | #ifdef HAVE_TARGET_32_LITTLE |
4358 | template | |
4359 | Output_section* | |
4360 | Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object, | |
4361 | const unsigned char* symbols, | |
4362 | off_t symbols_size, | |
4363 | const unsigned char* symbol_names, | |
4364 | off_t symbol_names_size, | |
4365 | unsigned int shndx, | |
4366 | const elfcpp::Shdr<32, false>& shdr, | |
4367 | unsigned int reloc_shndx, | |
4368 | unsigned int reloc_type, | |
4369 | off_t* off); | |
4370 | #endif | |
4371 | ||
4372 | #ifdef HAVE_TARGET_32_BIG | |
4373 | template | |
4374 | Output_section* | |
4375 | Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object, | |
4376 | const unsigned char* symbols, | |
4377 | off_t symbols_size, | |
4378 | const unsigned char* symbol_names, | |
4379 | off_t symbol_names_size, | |
4380 | unsigned int shndx, | |
4381 | const elfcpp::Shdr<32, true>& shdr, | |
4382 | unsigned int reloc_shndx, | |
4383 | unsigned int reloc_type, | |
4384 | off_t* off); | |
4385 | #endif | |
4386 | ||
4387 | #ifdef HAVE_TARGET_64_LITTLE | |
4388 | template | |
4389 | Output_section* | |
4390 | Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object, | |
4391 | const unsigned char* symbols, | |
4392 | off_t symbols_size, | |
4393 | const unsigned char* symbol_names, | |
4394 | off_t symbol_names_size, | |
4395 | unsigned int shndx, | |
4396 | const elfcpp::Shdr<64, false>& shdr, | |
4397 | unsigned int reloc_shndx, | |
4398 | unsigned int reloc_type, | |
4399 | off_t* off); | |
4400 | #endif | |
4401 | ||
4402 | #ifdef HAVE_TARGET_64_BIG | |
4403 | template | |
4404 | Output_section* | |
4405 | Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object, | |
4406 | const unsigned char* symbols, | |
4407 | off_t symbols_size, | |
4408 | const unsigned char* symbol_names, | |
4409 | off_t symbol_names_size, | |
4410 | unsigned int shndx, | |
4411 | const elfcpp::Shdr<64, true>& shdr, | |
4412 | unsigned int reloc_shndx, | |
4413 | unsigned int reloc_type, | |
4414 | off_t* off); | |
4415 | #endif | |
a2fb1b05 ILT |
4416 | |
4417 | } // End namespace gold. |