Commit | Line | Data |
---|---|---|
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", | |
a0506cca | 246 | ".debug_types", |
02d2ba74 ILT |
247 | ".debug_line", |
248 | ".debug_loc", | |
249 | ".debug_macinfo", | |
250 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
251 | ".debug_ranges", | |
252 | ".debug_str", | |
253 | }; | |
254 | ||
62b01cb5 ILT |
255 | static const char* lines_only_debug_sections[] = |
256 | { ".debug_abbrev", | |
257 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
258 | // ".debug_frame", | |
259 | ".debug_info", | |
a0506cca | 260 | // ".debug_types", |
62b01cb5 ILT |
261 | ".debug_line", |
262 | // ".debug_loc", | |
263 | // ".debug_macinfo", | |
264 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
265 | // ".debug_ranges", | |
266 | ".debug_str", | |
267 | }; | |
268 | ||
02d2ba74 ILT |
269 | static inline bool |
270 | is_gdb_debug_section(const char* str) | |
271 | { | |
272 | // We can do this faster: binary search or a hashtable. But why bother? | |
273 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) | |
274 | if (strcmp(str, gdb_sections[i]) == 0) | |
275 | return true; | |
276 | return false; | |
277 | } | |
278 | ||
62b01cb5 ILT |
279 | static inline bool |
280 | is_lines_only_debug_section(const char* str) | |
281 | { | |
282 | // We can do this faster: binary search or a hashtable. But why bother? | |
283 | for (size_t i = 0; | |
284 | i < sizeof(lines_only_debug_sections)/sizeof(*lines_only_debug_sections); | |
285 | ++i) | |
286 | if (strcmp(str, lines_only_debug_sections[i]) == 0) | |
287 | return true; | |
288 | return false; | |
289 | } | |
290 | ||
a2fb1b05 ILT |
291 | // Whether to include this section in the link. |
292 | ||
293 | template<int size, bool big_endian> | |
294 | bool | |
730cdc88 | 295 | Layout::include_section(Sized_relobj<size, big_endian>*, const char* name, |
a2fb1b05 ILT |
296 | const elfcpp::Shdr<size, big_endian>& shdr) |
297 | { | |
fd06b4aa CC |
298 | if (shdr.get_sh_flags() & elfcpp::SHF_EXCLUDE) |
299 | return false; | |
300 | ||
a2fb1b05 ILT |
301 | switch (shdr.get_sh_type()) |
302 | { | |
303 | case elfcpp::SHT_NULL: | |
304 | case elfcpp::SHT_SYMTAB: | |
305 | case elfcpp::SHT_DYNSYM: | |
a2fb1b05 ILT |
306 | case elfcpp::SHT_HASH: |
307 | case elfcpp::SHT_DYNAMIC: | |
308 | case elfcpp::SHT_SYMTAB_SHNDX: | |
309 | return false; | |
310 | ||
5cb66f97 ILT |
311 | case elfcpp::SHT_STRTAB: |
312 | // Discard the sections which have special meanings in the ELF | |
313 | // ABI. Keep others (e.g., .stabstr). We could also do this by | |
314 | // checking the sh_link fields of the appropriate sections. | |
315 | return (strcmp(name, ".dynstr") != 0 | |
316 | && strcmp(name, ".strtab") != 0 | |
317 | && strcmp(name, ".shstrtab") != 0); | |
318 | ||
a2fb1b05 ILT |
319 | case elfcpp::SHT_RELA: |
320 | case elfcpp::SHT_REL: | |
321 | case elfcpp::SHT_GROUP: | |
7019cd25 ILT |
322 | // If we are emitting relocations these should be handled |
323 | // elsewhere. | |
8851ecca ILT |
324 | gold_assert(!parameters->options().relocatable() |
325 | && !parameters->options().emit_relocs()); | |
6a74a719 | 326 | return false; |
a2fb1b05 | 327 | |
9e2dcb77 | 328 | case elfcpp::SHT_PROGBITS: |
8851ecca | 329 | if (parameters->options().strip_debug() |
9e2dcb77 ILT |
330 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
331 | { | |
e94cf127 | 332 | if (is_debug_info_section(name)) |
9e2dcb77 ILT |
333 | return false; |
334 | } | |
62b01cb5 ILT |
335 | if (parameters->options().strip_debug_non_line() |
336 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
337 | { | |
338 | // Debugging sections can only be recognized by name. | |
339 | if (is_prefix_of(".debug", name) | |
340 | && !is_lines_only_debug_section(name)) | |
341 | return false; | |
342 | } | |
8851ecca | 343 | if (parameters->options().strip_debug_gdb() |
02d2ba74 ILT |
344 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
345 | { | |
346 | // Debugging sections can only be recognized by name. | |
347 | if (is_prefix_of(".debug", name) | |
348 | && !is_gdb_debug_section(name)) | |
349 | return false; | |
350 | } | |
fd06b4aa CC |
351 | if (parameters->options().strip_lto_sections() |
352 | && !parameters->options().relocatable() | |
353 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
354 | { | |
355 | // Ignore LTO sections containing intermediate code. | |
356 | if (is_prefix_of(".gnu.lto_", name)) | |
357 | return false; | |
358 | } | |
6b7dd3f3 ILT |
359 | // The GNU linker strips .gnu_debuglink sections, so we do too. |
360 | // This is a feature used to keep debugging information in | |
361 | // separate files. | |
362 | if (strcmp(name, ".gnu_debuglink") == 0) | |
363 | return false; | |
9e2dcb77 ILT |
364 | return true; |
365 | ||
a2fb1b05 | 366 | default: |
a2fb1b05 ILT |
367 | return true; |
368 | } | |
369 | } | |
370 | ||
ead1e424 | 371 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 372 | |
a2fb1b05 | 373 | Output_section* |
ead1e424 | 374 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 375 | { |
a445fddf ILT |
376 | for (Section_list::const_iterator p = this->section_list_.begin(); |
377 | p != this->section_list_.end(); | |
ead1e424 | 378 | ++p) |
a445fddf ILT |
379 | if (strcmp((*p)->name(), name) == 0) |
380 | return *p; | |
ead1e424 ILT |
381 | return NULL; |
382 | } | |
a2fb1b05 | 383 | |
ead1e424 ILT |
384 | // Return an output segment of type TYPE, with segment flags SET set |
385 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 386 | |
ead1e424 ILT |
387 | Output_segment* |
388 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
389 | elfcpp::Elf_Word clear) const | |
390 | { | |
391 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
392 | p != this->segment_list_.end(); | |
393 | ++p) | |
394 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
395 | && ((*p)->flags() & set) == set | |
396 | && ((*p)->flags() & clear) == 0) | |
397 | return *p; | |
398 | return NULL; | |
399 | } | |
a2fb1b05 | 400 | |
ead1e424 | 401 | // Return the output section to use for section NAME with type TYPE |
a445fddf | 402 | // and section flags FLAGS. NAME must be canonicalized in the string |
f5c870d2 ILT |
403 | // pool, and NAME_KEY is the key. IS_INTERP is true if this is the |
404 | // .interp section. IS_DYNAMIC_LINKER_SECTION is true if this section | |
1a2dff53 ILT |
405 | // is used by the dynamic linker. IS_RELRO is true for a relro |
406 | // section. IS_LAST_RELRO is true for the last relro section. | |
407 | // IS_FIRST_NON_RELRO is true for the first non-relro section. | |
a2fb1b05 | 408 | |
ead1e424 | 409 | Output_section* |
f0641a0b | 410 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
f5c870d2 | 411 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, |
22f0da72 | 412 | Output_section_order order, bool is_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) |
22f0da72 ILT |
461 | os = this->make_output_section(name, type, flags, order, is_relro); |
462 | ||
a2fb1b05 | 463 | ins.first->second = os; |
ead1e424 | 464 | return os; |
a2fb1b05 | 465 | } |
ead1e424 ILT |
466 | } |
467 | ||
a445fddf ILT |
468 | // Pick the output section to use for section NAME, in input file |
469 | // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a | |
154e0e9a ILT |
470 | // linker created section. IS_INPUT_SECTION is true if we are |
471 | // choosing an output section for an input section found in a input | |
f5c870d2 ILT |
472 | // file. IS_INTERP is true if this is the .interp section. |
473 | // IS_DYNAMIC_LINKER_SECTION is true if this section is used by the | |
1a2dff53 ILT |
474 | // dynamic linker. IS_RELRO is true for a relro section. |
475 | // IS_LAST_RELRO is true for the last relro section. | |
476 | // IS_FIRST_NON_RELRO is true for the first non-relro section. This | |
477 | // will return NULL if the input section should be discarded. | |
a445fddf ILT |
478 | |
479 | Output_section* | |
480 | Layout::choose_output_section(const Relobj* relobj, const char* name, | |
481 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
22f0da72 ILT |
482 | bool is_input_section, Output_section_order order, |
483 | bool is_relro) | |
a445fddf | 484 | { |
154e0e9a ILT |
485 | // We should not see any input sections after we have attached |
486 | // sections to segments. | |
487 | gold_assert(!is_input_section || !this->sections_are_attached_); | |
488 | ||
489 | // Some flags in the input section should not be automatically | |
490 | // copied to the output section. | |
a445fddf ILT |
491 | flags &= ~ (elfcpp::SHF_INFO_LINK |
492 | | elfcpp::SHF_LINK_ORDER | |
493 | | elfcpp::SHF_GROUP | |
494 | | elfcpp::SHF_MERGE | |
495 | | elfcpp::SHF_STRINGS); | |
496 | ||
497 | if (this->script_options_->saw_sections_clause()) | |
498 | { | |
499 | // We are using a SECTIONS clause, so the output section is | |
500 | // chosen based only on the name. | |
501 | ||
502 | Script_sections* ss = this->script_options_->script_sections(); | |
503 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
504 | Output_section** output_section_slot; | |
1e5d2fb1 DK |
505 | Script_sections::Section_type script_section_type; |
506 | name = ss->output_section_name(file_name, name, &output_section_slot, | |
507 | &script_section_type); | |
a445fddf ILT |
508 | if (name == NULL) |
509 | { | |
510 | // The SECTIONS clause says to discard this input section. | |
511 | return NULL; | |
512 | } | |
513 | ||
1e5d2fb1 DK |
514 | // We can only handle script section types ST_NONE and ST_NOLOAD. |
515 | switch (script_section_type) | |
516 | { | |
517 | case Script_sections::ST_NONE: | |
518 | break; | |
519 | case Script_sections::ST_NOLOAD: | |
520 | flags &= elfcpp::SHF_ALLOC; | |
521 | break; | |
522 | default: | |
523 | gold_unreachable(); | |
524 | } | |
525 | ||
a445fddf ILT |
526 | // If this is an orphan section--one not mentioned in the linker |
527 | // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the | |
528 | // default processing below. | |
529 | ||
530 | if (output_section_slot != NULL) | |
531 | { | |
532 | if (*output_section_slot != NULL) | |
9c547ec3 ILT |
533 | { |
534 | (*output_section_slot)->update_flags_for_input_section(flags); | |
535 | return *output_section_slot; | |
536 | } | |
a445fddf ILT |
537 | |
538 | // We don't put sections found in the linker script into | |
539 | // SECTION_NAME_MAP_. That keeps us from getting confused | |
540 | // if an orphan section is mapped to a section with the same | |
541 | // name as one in the linker script. | |
542 | ||
543 | name = this->namepool_.add(name, false, NULL); | |
544 | ||
22f0da72 ILT |
545 | Output_section* os = this->make_output_section(name, type, flags, |
546 | order, is_relro); | |
547 | ||
a445fddf | 548 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
549 | |
550 | // Special handling for NOLOAD sections. | |
551 | if (script_section_type == Script_sections::ST_NOLOAD) | |
552 | { | |
553 | os->set_is_noload(); | |
554 | ||
555 | // The constructor of Output_section sets addresses of non-ALLOC | |
556 | // sections to 0 by default. We don't want that for NOLOAD | |
557 | // sections even if they have no SHF_ALLOC flag. | |
558 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0 | |
559 | && os->is_address_valid()) | |
560 | { | |
561 | gold_assert(os->address() == 0 | |
562 | && !os->is_offset_valid() | |
563 | && !os->is_data_size_valid()); | |
564 | os->reset_address_and_file_offset(); | |
565 | } | |
566 | } | |
567 | ||
a445fddf ILT |
568 | *output_section_slot = os; |
569 | return os; | |
570 | } | |
571 | } | |
572 | ||
573 | // FIXME: Handle SHF_OS_NONCONFORMING somewhere. | |
574 | ||
575 | // Turn NAME from the name of the input section into the name of the | |
576 | // output section. | |
577 | ||
578 | size_t len = strlen(name); | |
401a9a73 CC |
579 | if (is_input_section |
580 | && !this->script_options_->saw_sections_clause() | |
581 | && !parameters->options().relocatable()) | |
a445fddf ILT |
582 | name = Layout::output_section_name(name, &len); |
583 | ||
584 | Stringpool::Key name_key; | |
585 | name = this->namepool_.add_with_length(name, len, true, &name_key); | |
586 | ||
587 | // Find or make the output section. The output section is selected | |
588 | // based on the section name, type, and flags. | |
22f0da72 | 589 | return this->get_output_section(name, name_key, type, flags, order, is_relro); |
a445fddf ILT |
590 | } |
591 | ||
ead1e424 | 592 | // Return the output section to use for input section SHNDX, with name |
730cdc88 ILT |
593 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
594 | // index of a relocation section which applies to this section, or 0 | |
595 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
596 | // relocation section if there is one. Set *OFF to the offset of this | |
597 | // input section without the output section. Return NULL if the | |
598 | // section should be discarded. Set *OFF to -1 if the section | |
599 | // contents should not be written directly to the output file, but | |
600 | // will instead receive special handling. | |
ead1e424 ILT |
601 | |
602 | template<int size, bool big_endian> | |
603 | Output_section* | |
730cdc88 ILT |
604 | Layout::layout(Sized_relobj<size, big_endian>* object, unsigned int shndx, |
605 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, | |
606 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 | 607 | { |
ef9beddf ILT |
608 | *off = 0; |
609 | ||
ead1e424 ILT |
610 | if (!this->include_section(object, name, shdr)) |
611 | return NULL; | |
612 | ||
6a74a719 ILT |
613 | Output_section* os; |
614 | ||
2a0ff005 DK |
615 | // Sometimes .init_array*, .preinit_array* and .fini_array* do not have |
616 | // correct section types. Force them here. | |
617 | elfcpp::Elf_Word sh_type = shdr.get_sh_type(); | |
618 | if (sh_type == elfcpp::SHT_PROGBITS) | |
619 | { | |
620 | static const char init_array_prefix[] = ".init_array"; | |
621 | static const char preinit_array_prefix[] = ".preinit_array"; | |
622 | static const char fini_array_prefix[] = ".fini_array"; | |
623 | static size_t init_array_prefix_size = sizeof(init_array_prefix) - 1; | |
624 | static size_t preinit_array_prefix_size = | |
625 | sizeof(preinit_array_prefix) - 1; | |
626 | static size_t fini_array_prefix_size = sizeof(fini_array_prefix) - 1; | |
627 | ||
628 | if (strncmp(name, init_array_prefix, init_array_prefix_size) == 0) | |
629 | sh_type = elfcpp::SHT_INIT_ARRAY; | |
630 | else if (strncmp(name, preinit_array_prefix, preinit_array_prefix_size) | |
631 | == 0) | |
632 | sh_type = elfcpp::SHT_PREINIT_ARRAY; | |
633 | else if (strncmp(name, fini_array_prefix, fini_array_prefix_size) == 0) | |
634 | sh_type = elfcpp::SHT_FINI_ARRAY; | |
635 | } | |
636 | ||
6a74a719 ILT |
637 | // In a relocatable link a grouped section must not be combined with |
638 | // any other sections. | |
8851ecca | 639 | if (parameters->options().relocatable() |
6a74a719 ILT |
640 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
641 | { | |
642 | name = this->namepool_.add(name, true, NULL); | |
22f0da72 ILT |
643 | os = this->make_output_section(name, sh_type, shdr.get_sh_flags(), |
644 | ORDER_INVALID, false); | |
6a74a719 ILT |
645 | } |
646 | else | |
647 | { | |
2a0ff005 | 648 | os = this->choose_output_section(object, name, sh_type, |
22f0da72 ILT |
649 | shdr.get_sh_flags(), true, |
650 | ORDER_INVALID, false); | |
6a74a719 ILT |
651 | if (os == NULL) |
652 | return NULL; | |
653 | } | |
a2fb1b05 | 654 | |
2fd32231 ILT |
655 | // By default the GNU linker sorts input sections whose names match |
656 | // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*. The sections | |
657 | // are sorted by name. This is used to implement constructor | |
658 | // priority ordering. We are compatible. | |
659 | if (!this->script_options_->saw_sections_clause() | |
660 | && (is_prefix_of(".ctors.", name) | |
661 | || is_prefix_of(".dtors.", name) | |
662 | || is_prefix_of(".init_array.", name) | |
663 | || is_prefix_of(".fini_array.", name))) | |
664 | os->set_must_sort_attached_input_sections(); | |
665 | ||
a2fb1b05 ILT |
666 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
667 | ||
6e9ba2ca | 668 | *off = os->add_input_section(this, object, shndx, name, shdr, reloc_shndx, |
a445fddf | 669 | this->script_options_->saw_sections_clause()); |
d7bb5745 | 670 | this->have_added_input_section_ = true; |
a2fb1b05 ILT |
671 | |
672 | return os; | |
673 | } | |
674 | ||
6a74a719 ILT |
675 | // Handle a relocation section when doing a relocatable link. |
676 | ||
677 | template<int size, bool big_endian> | |
678 | Output_section* | |
679 | Layout::layout_reloc(Sized_relobj<size, big_endian>* object, | |
680 | unsigned int, | |
681 | const elfcpp::Shdr<size, big_endian>& shdr, | |
682 | Output_section* data_section, | |
683 | Relocatable_relocs* rr) | |
684 | { | |
8851ecca ILT |
685 | gold_assert(parameters->options().relocatable() |
686 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
687 | |
688 | int sh_type = shdr.get_sh_type(); | |
689 | ||
690 | std::string name; | |
691 | if (sh_type == elfcpp::SHT_REL) | |
692 | name = ".rel"; | |
693 | else if (sh_type == elfcpp::SHT_RELA) | |
694 | name = ".rela"; | |
695 | else | |
696 | gold_unreachable(); | |
697 | name += data_section->name(); | |
698 | ||
bd288ea2 ILT |
699 | // In a relocatable link relocs for a grouped section must not be |
700 | // combined with other reloc sections. | |
701 | Output_section* os; | |
702 | if (!parameters->options().relocatable() | |
703 | || (data_section->flags() & elfcpp::SHF_GROUP) == 0) | |
704 | os = this->choose_output_section(object, name.c_str(), sh_type, | |
22f0da72 ILT |
705 | shdr.get_sh_flags(), false, |
706 | ORDER_INVALID, false); | |
bd288ea2 ILT |
707 | else |
708 | { | |
709 | const char* n = this->namepool_.add(name.c_str(), true, NULL); | |
710 | os = this->make_output_section(n, sh_type, shdr.get_sh_flags(), | |
22f0da72 | 711 | ORDER_INVALID, false); |
bd288ea2 | 712 | } |
6a74a719 ILT |
713 | |
714 | os->set_should_link_to_symtab(); | |
715 | os->set_info_section(data_section); | |
716 | ||
717 | Output_section_data* posd; | |
718 | if (sh_type == elfcpp::SHT_REL) | |
719 | { | |
720 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); | |
721 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, | |
722 | size, | |
723 | big_endian>(rr); | |
724 | } | |
725 | else if (sh_type == elfcpp::SHT_RELA) | |
726 | { | |
727 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); | |
728 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, | |
729 | size, | |
730 | big_endian>(rr); | |
731 | } | |
732 | else | |
733 | gold_unreachable(); | |
734 | ||
735 | os->add_output_section_data(posd); | |
736 | rr->set_output_data(posd); | |
737 | ||
738 | return os; | |
739 | } | |
740 | ||
741 | // Handle a group section when doing a relocatable link. | |
742 | ||
743 | template<int size, bool big_endian> | |
744 | void | |
745 | Layout::layout_group(Symbol_table* symtab, | |
746 | Sized_relobj<size, big_endian>* object, | |
747 | unsigned int, | |
748 | const char* group_section_name, | |
749 | const char* signature, | |
750 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
751 | elfcpp::Elf_Word flags, |
752 | std::vector<unsigned int>* shndxes) | |
6a74a719 | 753 | { |
8851ecca | 754 | gold_assert(parameters->options().relocatable()); |
6a74a719 ILT |
755 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
756 | group_section_name = this->namepool_.add(group_section_name, true, NULL); | |
757 | Output_section* os = this->make_output_section(group_section_name, | |
758 | elfcpp::SHT_GROUP, | |
f5c870d2 | 759 | shdr.get_sh_flags(), |
22f0da72 | 760 | ORDER_INVALID, false); |
6a74a719 ILT |
761 | |
762 | // We need to find a symbol with the signature in the symbol table. | |
755ab8af | 763 | // If we don't find one now, we need to look again later. |
6a74a719 | 764 | Symbol* sym = symtab->lookup(signature, NULL); |
755ab8af ILT |
765 | if (sym != NULL) |
766 | os->set_info_symndx(sym); | |
767 | else | |
768 | { | |
e55bde5e ILT |
769 | // Reserve some space to minimize reallocations. |
770 | if (this->group_signatures_.empty()) | |
771 | this->group_signatures_.reserve(this->number_of_input_files_ * 16); | |
772 | ||
755ab8af ILT |
773 | // We will wind up using a symbol whose name is the signature. |
774 | // So just put the signature in the symbol name pool to save it. | |
775 | signature = symtab->canonicalize_name(signature); | |
776 | this->group_signatures_.push_back(Group_signature(os, signature)); | |
777 | } | |
6a74a719 ILT |
778 | |
779 | os->set_should_link_to_symtab(); | |
6a74a719 ILT |
780 | os->set_entsize(4); |
781 | ||
782 | section_size_type entry_count = | |
783 | convert_to_section_size_type(shdr.get_sh_size() / 4); | |
784 | Output_section_data* posd = | |
8825ac63 ILT |
785 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
786 | shndxes); | |
6a74a719 ILT |
787 | os->add_output_section_data(posd); |
788 | } | |
789 | ||
730cdc88 ILT |
790 | // Special GNU handling of sections name .eh_frame. They will |
791 | // normally hold exception frame data as defined by the C++ ABI | |
792 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
793 | |
794 | template<int size, bool big_endian> | |
730cdc88 ILT |
795 | Output_section* |
796 | Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object, | |
797 | const unsigned char* symbols, | |
798 | off_t symbols_size, | |
799 | const unsigned char* symbol_names, | |
800 | off_t symbol_names_size, | |
3151305a | 801 | unsigned int shndx, |
3151305a | 802 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
803 | unsigned int reloc_shndx, unsigned int reloc_type, |
804 | off_t* off) | |
3151305a | 805 | { |
730cdc88 | 806 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS); |
1650c4ff | 807 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 | 808 | |
a445fddf | 809 | const char* const name = ".eh_frame"; |
22f0da72 | 810 | Output_section* os = this->choose_output_section(object, name, |
a445fddf | 811 | elfcpp::SHT_PROGBITS, |
22f0da72 ILT |
812 | elfcpp::SHF_ALLOC, false, |
813 | ORDER_EHFRAME, false); | |
a445fddf ILT |
814 | if (os == NULL) |
815 | return NULL; | |
730cdc88 | 816 | |
3151305a ILT |
817 | if (this->eh_frame_section_ == NULL) |
818 | { | |
819 | this->eh_frame_section_ = os; | |
730cdc88 | 820 | this->eh_frame_data_ = new Eh_frame(); |
3151305a | 821 | |
e55bde5e | 822 | if (parameters->options().eh_frame_hdr()) |
3151305a | 823 | { |
3151305a | 824 | Output_section* hdr_os = |
22f0da72 | 825 | this->choose_output_section(NULL, ".eh_frame_hdr", |
a445fddf | 826 | elfcpp::SHT_PROGBITS, |
22f0da72 ILT |
827 | elfcpp::SHF_ALLOC, false, |
828 | ORDER_EHFRAME, false); | |
3151305a | 829 | |
a445fddf ILT |
830 | if (hdr_os != NULL) |
831 | { | |
832 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, | |
833 | this->eh_frame_data_); | |
834 | hdr_os->add_output_section_data(hdr_posd); | |
3151305a | 835 | |
a445fddf | 836 | hdr_os->set_after_input_sections(); |
730cdc88 | 837 | |
1c4f3631 ILT |
838 | if (!this->script_options_->saw_phdrs_clause()) |
839 | { | |
840 | Output_segment* hdr_oseg; | |
841 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, | |
842 | elfcpp::PF_R); | |
22f0da72 ILT |
843 | hdr_oseg->add_output_section_to_nonload(hdr_os, |
844 | elfcpp::PF_R); | |
1c4f3631 | 845 | } |
730cdc88 | 846 | |
a445fddf ILT |
847 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); |
848 | } | |
3151305a ILT |
849 | } |
850 | } | |
851 | ||
852 | gold_assert(this->eh_frame_section_ == os); | |
853 | ||
730cdc88 ILT |
854 | if (this->eh_frame_data_->add_ehframe_input_section(object, |
855 | symbols, | |
856 | symbols_size, | |
857 | symbol_names, | |
858 | symbol_names_size, | |
859 | shndx, | |
860 | reloc_shndx, | |
861 | reloc_type)) | |
2c38906f | 862 | { |
154e0e9a ILT |
863 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
864 | ||
2c38906f ILT |
865 | // We found a .eh_frame section we are going to optimize, so now |
866 | // we can add the set of optimized sections to the output | |
867 | // section. We need to postpone adding this until we've found a | |
868 | // section we can optimize so that the .eh_frame section in | |
869 | // crtbegin.o winds up at the start of the output section. | |
870 | if (!this->added_eh_frame_data_) | |
871 | { | |
872 | os->add_output_section_data(this->eh_frame_data_); | |
873 | this->added_eh_frame_data_ = true; | |
874 | } | |
875 | *off = -1; | |
876 | } | |
730cdc88 ILT |
877 | else |
878 | { | |
879 | // We couldn't handle this .eh_frame section for some reason. | |
880 | // Add it as a normal section. | |
a445fddf | 881 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); |
6e9ba2ca | 882 | *off = os->add_input_section(this, object, shndx, name, shdr, reloc_shndx, |
a445fddf | 883 | saw_sections_clause); |
d7bb5745 | 884 | this->have_added_input_section_ = true; |
730cdc88 ILT |
885 | } |
886 | ||
887 | return os; | |
3151305a ILT |
888 | } |
889 | ||
9f1d377b ILT |
890 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
891 | // the output section. | |
ead1e424 | 892 | |
9f1d377b | 893 | Output_section* |
ead1e424 ILT |
894 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
895 | elfcpp::Elf_Xword flags, | |
f5c870d2 | 896 | Output_section_data* posd, |
22f0da72 | 897 | Output_section_order order, bool is_relro) |
ead1e424 | 898 | { |
a445fddf | 899 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
22f0da72 | 900 | false, order, is_relro); |
a445fddf ILT |
901 | if (os != NULL) |
902 | os->add_output_section_data(posd); | |
9f1d377b | 903 | return os; |
ead1e424 ILT |
904 | } |
905 | ||
a2fb1b05 ILT |
906 | // Map section flags to segment flags. |
907 | ||
908 | elfcpp::Elf_Word | |
909 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
910 | { | |
911 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
912 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
913 | ret |= elfcpp::PF_W; | |
914 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
915 | ret |= elfcpp::PF_X; | |
916 | return ret; | |
917 | } | |
918 | ||
96803768 ILT |
919 | // Sometimes we compress sections. This is typically done for |
920 | // sections that are not part of normal program execution (such as | |
921 | // .debug_* sections), and where the readers of these sections know | |
c3b65ac4 CD |
922 | // how to deal with compressed sections. This routine doesn't say for |
923 | // certain whether we'll compress -- it depends on commandline options | |
924 | // as well -- just whether this section is a candidate for compression. | |
925 | // (The Output_compressed_section class decides whether to compress | |
926 | // a given section, and picks the name of the compressed section.) | |
96803768 ILT |
927 | |
928 | static bool | |
929 | is_compressible_debug_section(const char* secname) | |
930 | { | |
a2e47362 CC |
931 | return (is_prefix_of(".debug", secname)); |
932 | } | |
933 | ||
934 | // We may see compressed debug sections in input files. Return TRUE | |
935 | // if this is the name of a compressed debug section. | |
936 | ||
937 | bool | |
938 | is_compressed_debug_section(const char* secname) | |
939 | { | |
940 | return (is_prefix_of(".zdebug", secname)); | |
96803768 ILT |
941 | } |
942 | ||
a2fb1b05 | 943 | // Make a new Output_section, and attach it to segments as |
22f0da72 ILT |
944 | // appropriate. ORDER is the order in which this section should |
945 | // appear in the output segment. IS_RELRO is true if this is a relro | |
946 | // (read-only after relocations) section. | |
a2fb1b05 ILT |
947 | |
948 | Output_section* | |
949 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
22f0da72 ILT |
950 | elfcpp::Elf_Xword flags, |
951 | Output_section_order order, bool is_relro) | |
a2fb1b05 | 952 | { |
96803768 ILT |
953 | Output_section* os; |
954 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 955 | && strcmp(parameters->options().compress_debug_sections(), "none") != 0 |
96803768 | 956 | && is_compressible_debug_section(name)) |
e55bde5e ILT |
957 | os = new Output_compressed_section(¶meters->options(), name, type, |
958 | flags); | |
62b01cb5 | 959 | else if ((flags & elfcpp::SHF_ALLOC) == 0 |
e55bde5e | 960 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
961 | && strcmp(".debug_abbrev", name) == 0) |
962 | { | |
963 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( | |
964 | name, type, flags); | |
965 | if (this->debug_info_) | |
966 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
967 | } | |
968 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 969 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
970 | && strcmp(".debug_info", name) == 0) |
971 | { | |
972 | os = this->debug_info_ = new Output_reduced_debug_info_section( | |
973 | name, type, flags); | |
974 | if (this->debug_abbrev_) | |
975 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
976 | } | |
977 | else | |
c0a62865 DK |
978 | { |
979 | // FIXME: const_cast is ugly. | |
980 | Target* target = const_cast<Target*>(¶meters->target()); | |
981 | os = target->make_output_section(name, type, flags); | |
982 | } | |
96803768 | 983 | |
22f0da72 ILT |
984 | // With -z relro, we have to recognize the special sections by name. |
985 | // There is no other way. | |
986 | bool is_relro_local = false; | |
987 | if (!this->script_options_->saw_sections_clause() | |
988 | && parameters->options().relro() | |
989 | && type == elfcpp::SHT_PROGBITS | |
990 | && (flags & elfcpp::SHF_ALLOC) != 0 | |
991 | && (flags & elfcpp::SHF_WRITE) != 0) | |
992 | { | |
993 | if (strcmp(name, ".data.rel.ro") == 0) | |
994 | is_relro = true; | |
995 | else if (strcmp(name, ".data.rel.ro.local") == 0) | |
996 | { | |
997 | is_relro = true; | |
998 | is_relro_local = true; | |
999 | } | |
1000 | else if (type == elfcpp::SHT_INIT_ARRAY | |
1001 | || type == elfcpp::SHT_FINI_ARRAY | |
1002 | || type == elfcpp::SHT_PREINIT_ARRAY) | |
1003 | is_relro = true; | |
1004 | else if (strcmp(name, ".ctors") == 0 | |
1005 | || strcmp(name, ".dtors") == 0 | |
1006 | || strcmp(name, ".jcr") == 0) | |
1007 | is_relro = true; | |
1008 | } | |
1009 | ||
1a2dff53 ILT |
1010 | if (is_relro) |
1011 | os->set_is_relro(); | |
22f0da72 ILT |
1012 | |
1013 | if (order == ORDER_INVALID && (flags & elfcpp::SHF_ALLOC) != 0) | |
1014 | order = this->default_section_order(os, is_relro_local); | |
1015 | ||
1016 | os->set_order(order); | |
f5c870d2 | 1017 | |
8a5e3e08 ILT |
1018 | parameters->target().new_output_section(os); |
1019 | ||
a3ad94ed | 1020 | this->section_list_.push_back(os); |
a2fb1b05 | 1021 | |
2fd32231 ILT |
1022 | // The GNU linker by default sorts some sections by priority, so we |
1023 | // do the same. We need to know that this might happen before we | |
1024 | // attach any input sections. | |
1025 | if (!this->script_options_->saw_sections_clause() | |
1026 | && (strcmp(name, ".ctors") == 0 | |
1027 | || strcmp(name, ".dtors") == 0 | |
1028 | || strcmp(name, ".init_array") == 0 | |
1029 | || strcmp(name, ".fini_array") == 0)) | |
1030 | os->set_may_sort_attached_input_sections(); | |
1031 | ||
1518dc8f ILT |
1032 | // Check for .stab*str sections, as .stab* sections need to link to |
1033 | // them. | |
1034 | if (type == elfcpp::SHT_STRTAB | |
1035 | && !this->have_stabstr_section_ | |
1036 | && strncmp(name, ".stab", 5) == 0 | |
1037 | && strcmp(name + strlen(name) - 3, "str") == 0) | |
1038 | this->have_stabstr_section_ = true; | |
1039 | ||
154e0e9a ILT |
1040 | // If we have already attached the sections to segments, then we |
1041 | // need to attach this one now. This happens for sections created | |
1042 | // directly by the linker. | |
1043 | if (this->sections_are_attached_) | |
1044 | this->attach_section_to_segment(os); | |
1045 | ||
4e2b1697 ILT |
1046 | return os; |
1047 | } | |
a445fddf | 1048 | |
22f0da72 ILT |
1049 | // Return the default order in which a section should be placed in an |
1050 | // output segment. This function captures a lot of the ideas in | |
1051 | // ld/scripttempl/elf.sc in the GNU linker. Note that the order of a | |
1052 | // linker created section is normally set when the section is created; | |
1053 | // this function is used for input sections. | |
1054 | ||
1055 | Output_section_order | |
1056 | Layout::default_section_order(Output_section* os, bool is_relro_local) | |
1057 | { | |
1058 | gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0); | |
1059 | bool is_write = (os->flags() & elfcpp::SHF_WRITE) != 0; | |
1060 | bool is_execinstr = (os->flags() & elfcpp::SHF_EXECINSTR) != 0; | |
1061 | bool is_bss = false; | |
1062 | ||
1063 | switch (os->type()) | |
1064 | { | |
1065 | default: | |
1066 | case elfcpp::SHT_PROGBITS: | |
1067 | break; | |
1068 | case elfcpp::SHT_NOBITS: | |
1069 | is_bss = true; | |
1070 | break; | |
1071 | case elfcpp::SHT_RELA: | |
1072 | case elfcpp::SHT_REL: | |
1073 | if (!is_write) | |
1074 | return ORDER_DYNAMIC_RELOCS; | |
1075 | break; | |
1076 | case elfcpp::SHT_HASH: | |
1077 | case elfcpp::SHT_DYNAMIC: | |
1078 | case elfcpp::SHT_SHLIB: | |
1079 | case elfcpp::SHT_DYNSYM: | |
1080 | case elfcpp::SHT_GNU_HASH: | |
1081 | case elfcpp::SHT_GNU_verdef: | |
1082 | case elfcpp::SHT_GNU_verneed: | |
1083 | case elfcpp::SHT_GNU_versym: | |
1084 | if (!is_write) | |
1085 | return ORDER_DYNAMIC_LINKER; | |
1086 | break; | |
1087 | case elfcpp::SHT_NOTE: | |
1088 | return is_write ? ORDER_RW_NOTE : ORDER_RO_NOTE; | |
1089 | } | |
1090 | ||
1091 | if ((os->flags() & elfcpp::SHF_TLS) != 0) | |
1092 | return is_bss ? ORDER_TLS_BSS : ORDER_TLS_DATA; | |
1093 | ||
1094 | if (!is_bss && !is_write) | |
1095 | { | |
1096 | if (is_execinstr) | |
1097 | { | |
1098 | if (strcmp(os->name(), ".init") == 0) | |
1099 | return ORDER_INIT; | |
1100 | else if (strcmp(os->name(), ".fini") == 0) | |
1101 | return ORDER_FINI; | |
1102 | } | |
1103 | return is_execinstr ? ORDER_TEXT : ORDER_READONLY; | |
1104 | } | |
1105 | ||
1106 | if (os->is_relro()) | |
1107 | return is_relro_local ? ORDER_RELRO_LOCAL : ORDER_RELRO; | |
1108 | ||
1109 | if (os->is_small_section()) | |
1110 | return is_bss ? ORDER_SMALL_BSS : ORDER_SMALL_DATA; | |
1111 | if (os->is_large_section()) | |
1112 | return is_bss ? ORDER_LARGE_BSS : ORDER_LARGE_DATA; | |
1113 | ||
1114 | return is_bss ? ORDER_BSS : ORDER_DATA; | |
1115 | } | |
1116 | ||
154e0e9a ILT |
1117 | // Attach output sections to segments. This is called after we have |
1118 | // seen all the input sections. | |
1119 | ||
1120 | void | |
1121 | Layout::attach_sections_to_segments() | |
1122 | { | |
1123 | for (Section_list::iterator p = this->section_list_.begin(); | |
1124 | p != this->section_list_.end(); | |
1125 | ++p) | |
1126 | this->attach_section_to_segment(*p); | |
1127 | ||
1128 | this->sections_are_attached_ = true; | |
1129 | } | |
1130 | ||
1131 | // Attach an output section to a segment. | |
1132 | ||
1133 | void | |
1134 | Layout::attach_section_to_segment(Output_section* os) | |
1135 | { | |
1136 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
1137 | this->unattached_section_list_.push_back(os); | |
1138 | else | |
1139 | this->attach_allocated_section_to_segment(os); | |
1140 | } | |
1141 | ||
4e2b1697 | 1142 | // Attach an allocated output section to a segment. |
1c4f3631 | 1143 | |
4e2b1697 | 1144 | void |
154e0e9a | 1145 | Layout::attach_allocated_section_to_segment(Output_section* os) |
4e2b1697 | 1146 | { |
154e0e9a | 1147 | elfcpp::Elf_Xword flags = os->flags(); |
4e2b1697 | 1148 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
a2fb1b05 | 1149 | |
4e2b1697 ILT |
1150 | if (parameters->options().relocatable()) |
1151 | return; | |
a2fb1b05 | 1152 | |
4e2b1697 ILT |
1153 | // If we have a SECTIONS clause, we can't handle the attachment to |
1154 | // segments until after we've seen all the sections. | |
1155 | if (this->script_options_->saw_sections_clause()) | |
1156 | return; | |
a2fb1b05 | 1157 | |
4e2b1697 | 1158 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
756ac4a8 | 1159 | |
4e2b1697 | 1160 | // This output section goes into a PT_LOAD segment. |
a2fb1b05 | 1161 | |
4e2b1697 | 1162 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
a2fb1b05 | 1163 | |
a192ba05 ILT |
1164 | // Check for --section-start. |
1165 | uint64_t addr; | |
1166 | bool is_address_set = parameters->options().section_start(os->name(), &addr); | |
f5c870d2 | 1167 | |
4e2b1697 ILT |
1168 | // In general the only thing we really care about for PT_LOAD |
1169 | // segments is whether or not they are writable, so that is how we | |
8a5e3e08 ILT |
1170 | // search for them. Large data sections also go into their own |
1171 | // PT_LOAD segment. People who need segments sorted on some other | |
4e2b1697 | 1172 | // basis will have to use a linker script. |
a2fb1b05 | 1173 | |
4e2b1697 ILT |
1174 | Segment_list::const_iterator p; |
1175 | for (p = this->segment_list_.begin(); | |
1176 | p != this->segment_list_.end(); | |
1177 | ++p) | |
1178 | { | |
8a5e3e08 ILT |
1179 | if ((*p)->type() != elfcpp::PT_LOAD) |
1180 | continue; | |
1181 | if (!parameters->options().omagic() | |
1182 | && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W)) | |
1183 | continue; | |
1184 | // If -Tbss was specified, we need to separate the data and BSS | |
1185 | // segments. | |
1186 | if (parameters->options().user_set_Tbss()) | |
1187 | { | |
1188 | if ((os->type() == elfcpp::SHT_NOBITS) | |
1189 | == (*p)->has_any_data_sections()) | |
1190 | continue; | |
1191 | } | |
1192 | if (os->is_large_data_section() && !(*p)->is_large_data_segment()) | |
1193 | continue; | |
4e2b1697 | 1194 | |
a192ba05 ILT |
1195 | if (is_address_set) |
1196 | { | |
1197 | if ((*p)->are_addresses_set()) | |
1198 | continue; | |
1199 | ||
1200 | (*p)->add_initial_output_data(os); | |
1201 | (*p)->update_flags_for_output_section(seg_flags); | |
1202 | (*p)->set_addresses(addr, addr); | |
1203 | break; | |
1204 | } | |
1205 | ||
22f0da72 | 1206 | (*p)->add_output_section_to_load(this, os, seg_flags); |
8a5e3e08 | 1207 | break; |
4e2b1697 | 1208 | } |
54dc6425 | 1209 | |
4e2b1697 ILT |
1210 | if (p == this->segment_list_.end()) |
1211 | { | |
1212 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, | |
1213 | seg_flags); | |
8a5e3e08 ILT |
1214 | if (os->is_large_data_section()) |
1215 | oseg->set_is_large_data_segment(); | |
22f0da72 | 1216 | oseg->add_output_section_to_load(this, os, seg_flags); |
a192ba05 ILT |
1217 | if (is_address_set) |
1218 | oseg->set_addresses(addr, addr); | |
a2fb1b05 ILT |
1219 | } |
1220 | ||
4e2b1697 ILT |
1221 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
1222 | // segment. | |
1223 | if (os->type() == elfcpp::SHT_NOTE) | |
1224 | { | |
1225 | // See if we already have an equivalent PT_NOTE segment. | |
1226 | for (p = this->segment_list_.begin(); | |
1227 | p != segment_list_.end(); | |
1228 | ++p) | |
1229 | { | |
1230 | if ((*p)->type() == elfcpp::PT_NOTE | |
1231 | && (((*p)->flags() & elfcpp::PF_W) | |
1232 | == (seg_flags & elfcpp::PF_W))) | |
1233 | { | |
22f0da72 | 1234 | (*p)->add_output_section_to_nonload(os, seg_flags); |
4e2b1697 ILT |
1235 | break; |
1236 | } | |
1237 | } | |
1238 | ||
1239 | if (p == this->segment_list_.end()) | |
1240 | { | |
1241 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, | |
1242 | seg_flags); | |
22f0da72 | 1243 | oseg->add_output_section_to_nonload(os, seg_flags); |
4e2b1697 ILT |
1244 | } |
1245 | } | |
1246 | ||
1247 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
1248 | // segment. There can only be one such segment. | |
1249 | if ((flags & elfcpp::SHF_TLS) != 0) | |
1250 | { | |
1251 | if (this->tls_segment_ == NULL) | |
2d924fd9 | 1252 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
22f0da72 | 1253 | this->tls_segment_->add_output_section_to_nonload(os, seg_flags); |
4e2b1697 | 1254 | } |
9f1d377b ILT |
1255 | |
1256 | // If -z relro is in effect, and we see a relro section, we create a | |
1257 | // PT_GNU_RELRO segment. There can only be one such segment. | |
1258 | if (os->is_relro() && parameters->options().relro()) | |
1259 | { | |
1260 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); | |
1261 | if (this->relro_segment_ == NULL) | |
2d924fd9 | 1262 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
22f0da72 | 1263 | this->relro_segment_->add_output_section_to_nonload(os, seg_flags); |
9f1d377b | 1264 | } |
a2fb1b05 ILT |
1265 | } |
1266 | ||
919ed24c ILT |
1267 | // Make an output section for a script. |
1268 | ||
1269 | Output_section* | |
1e5d2fb1 DK |
1270 | Layout::make_output_section_for_script( |
1271 | const char* name, | |
1272 | Script_sections::Section_type section_type) | |
919ed24c ILT |
1273 | { |
1274 | name = this->namepool_.add(name, false, NULL); | |
1e5d2fb1 DK |
1275 | elfcpp::Elf_Xword sh_flags = elfcpp::SHF_ALLOC; |
1276 | if (section_type == Script_sections::ST_NOLOAD) | |
1277 | sh_flags = 0; | |
919ed24c | 1278 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, |
22f0da72 ILT |
1279 | sh_flags, ORDER_INVALID, |
1280 | false); | |
919ed24c | 1281 | os->set_found_in_sections_clause(); |
1e5d2fb1 DK |
1282 | if (section_type == Script_sections::ST_NOLOAD) |
1283 | os->set_is_noload(); | |
919ed24c ILT |
1284 | return os; |
1285 | } | |
1286 | ||
3802b2dd ILT |
1287 | // Return the number of segments we expect to see. |
1288 | ||
1289 | size_t | |
1290 | Layout::expected_segment_count() const | |
1291 | { | |
1292 | size_t ret = this->segment_list_.size(); | |
1293 | ||
1294 | // If we didn't see a SECTIONS clause in a linker script, we should | |
1295 | // already have the complete list of segments. Otherwise we ask the | |
1296 | // SECTIONS clause how many segments it expects, and add in the ones | |
1297 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) | |
1298 | ||
1299 | if (!this->script_options_->saw_sections_clause()) | |
1300 | return ret; | |
1301 | else | |
1302 | { | |
1303 | const Script_sections* ss = this->script_options_->script_sections(); | |
1304 | return ret + ss->expected_segment_count(this); | |
1305 | } | |
1306 | } | |
1307 | ||
35cdfc9a ILT |
1308 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
1309 | // is whether we saw a .note.GNU-stack section in the object file. | |
1310 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
1311 | // protection required for stack memory. We record this in an | |
1312 | // executable as a PT_GNU_STACK segment. If an object file does not | |
1313 | // have a .note.GNU-stack segment, we must assume that it is an old | |
1314 | // object. On some targets that will force an executable stack. | |
1315 | ||
1316 | void | |
1317 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags) | |
1318 | { | |
1319 | if (!seen_gnu_stack) | |
1320 | this->input_without_gnu_stack_note_ = true; | |
1321 | else | |
1322 | { | |
1323 | this->input_with_gnu_stack_note_ = true; | |
1324 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
1325 | this->input_requires_executable_stack_ = true; | |
1326 | } | |
1327 | } | |
1328 | ||
9c547ec3 ILT |
1329 | // Create automatic note sections. |
1330 | ||
1331 | void | |
1332 | Layout::create_notes() | |
1333 | { | |
1334 | this->create_gold_note(); | |
1335 | this->create_executable_stack_info(); | |
1336 | this->create_build_id(); | |
1337 | } | |
1338 | ||
a3ad94ed ILT |
1339 | // Create the dynamic sections which are needed before we read the |
1340 | // relocs. | |
1341 | ||
1342 | void | |
9b07f471 | 1343 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
a3ad94ed | 1344 | { |
436ca963 | 1345 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
1346 | return; |
1347 | ||
3802b2dd ILT |
1348 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
1349 | elfcpp::SHT_DYNAMIC, | |
1350 | (elfcpp::SHF_ALLOC | |
1351 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
1352 | false, ORDER_RELRO, |
1353 | true); | |
a3ad94ed | 1354 | |
f0ba79e2 ILT |
1355 | this->dynamic_symbol_ = |
1356 | symtab->define_in_output_data("_DYNAMIC", NULL, Symbol_table::PREDEFINED, | |
1357 | this->dynamic_section_, 0, 0, | |
1358 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, | |
1359 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 1360 | |
9025d29d | 1361 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 ILT |
1362 | |
1363 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); | |
a3ad94ed ILT |
1364 | } |
1365 | ||
bfd58944 ILT |
1366 | // For each output section whose name can be represented as C symbol, |
1367 | // define __start and __stop symbols for the section. This is a GNU | |
1368 | // extension. | |
1369 | ||
1370 | void | |
9b07f471 | 1371 | Layout::define_section_symbols(Symbol_table* symtab) |
bfd58944 ILT |
1372 | { |
1373 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1374 | p != this->section_list_.end(); | |
1375 | ++p) | |
1376 | { | |
1377 | const char* const name = (*p)->name(); | |
f1ec9ded | 1378 | if (is_cident(name)) |
bfd58944 ILT |
1379 | { |
1380 | const std::string name_string(name); | |
f1ec9ded ST |
1381 | const std::string start_name(cident_section_start_prefix |
1382 | + name_string); | |
1383 | const std::string stop_name(cident_section_stop_prefix | |
1384 | + name_string); | |
bfd58944 | 1385 | |
9b07f471 | 1386 | symtab->define_in_output_data(start_name.c_str(), |
bfd58944 | 1387 | NULL, // version |
99fff23b | 1388 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
1389 | *p, |
1390 | 0, // value | |
1391 | 0, // symsize | |
1392 | elfcpp::STT_NOTYPE, | |
1393 | elfcpp::STB_GLOBAL, | |
1394 | elfcpp::STV_DEFAULT, | |
1395 | 0, // nonvis | |
1396 | false, // offset_is_from_end | |
a445fddf | 1397 | true); // only_if_ref |
bfd58944 | 1398 | |
9b07f471 | 1399 | symtab->define_in_output_data(stop_name.c_str(), |
bfd58944 | 1400 | NULL, // version |
99fff23b | 1401 | Symbol_table::PREDEFINED, |
bfd58944 ILT |
1402 | *p, |
1403 | 0, // value | |
1404 | 0, // symsize | |
1405 | elfcpp::STT_NOTYPE, | |
1406 | elfcpp::STB_GLOBAL, | |
1407 | elfcpp::STV_DEFAULT, | |
1408 | 0, // nonvis | |
1409 | true, // offset_is_from_end | |
a445fddf | 1410 | true); // only_if_ref |
bfd58944 ILT |
1411 | } |
1412 | } | |
1413 | } | |
1414 | ||
755ab8af ILT |
1415 | // Define symbols for group signatures. |
1416 | ||
1417 | void | |
1418 | Layout::define_group_signatures(Symbol_table* symtab) | |
1419 | { | |
1420 | for (Group_signatures::iterator p = this->group_signatures_.begin(); | |
1421 | p != this->group_signatures_.end(); | |
1422 | ++p) | |
1423 | { | |
1424 | Symbol* sym = symtab->lookup(p->signature, NULL); | |
1425 | if (sym != NULL) | |
1426 | p->section->set_info_symndx(sym); | |
1427 | else | |
1428 | { | |
1429 | // Force the name of the group section to the group | |
1430 | // signature, and use the group's section symbol as the | |
1431 | // signature symbol. | |
1432 | if (strcmp(p->section->name(), p->signature) != 0) | |
1433 | { | |
1434 | const char* name = this->namepool_.add(p->signature, | |
1435 | true, NULL); | |
1436 | p->section->set_name(name); | |
1437 | } | |
1438 | p->section->set_needs_symtab_index(); | |
1439 | p->section->set_info_section_symndx(p->section); | |
1440 | } | |
1441 | } | |
1442 | ||
1443 | this->group_signatures_.clear(); | |
1444 | } | |
1445 | ||
75f65a3e ILT |
1446 | // Find the first read-only PT_LOAD segment, creating one if |
1447 | // necessary. | |
54dc6425 | 1448 | |
75f65a3e ILT |
1449 | Output_segment* |
1450 | Layout::find_first_load_seg() | |
54dc6425 | 1451 | { |
75f65a3e ILT |
1452 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
1453 | p != this->segment_list_.end(); | |
1454 | ++p) | |
1455 | { | |
1456 | if ((*p)->type() == elfcpp::PT_LOAD | |
1457 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
af6156ef ILT |
1458 | && (parameters->options().omagic() |
1459 | || ((*p)->flags() & elfcpp::PF_W) == 0)) | |
75f65a3e ILT |
1460 | return *p; |
1461 | } | |
1462 | ||
1c4f3631 ILT |
1463 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
1464 | ||
3802b2dd ILT |
1465 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
1466 | elfcpp::PF_R); | |
75f65a3e | 1467 | return load_seg; |
54dc6425 ILT |
1468 | } |
1469 | ||
20e6d0d6 DK |
1470 | // Save states of all current output segments. Store saved states |
1471 | // in SEGMENT_STATES. | |
1472 | ||
1473 | void | |
1474 | Layout::save_segments(Segment_states* segment_states) | |
1475 | { | |
1476 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
1477 | p != this->segment_list_.end(); | |
1478 | ++p) | |
1479 | { | |
1480 | Output_segment* segment = *p; | |
1481 | // Shallow copy. | |
1482 | Output_segment* copy = new Output_segment(*segment); | |
1483 | (*segment_states)[segment] = copy; | |
1484 | } | |
1485 | } | |
1486 | ||
1487 | // Restore states of output segments and delete any segment not found in | |
1488 | // SEGMENT_STATES. | |
1489 | ||
1490 | void | |
1491 | Layout::restore_segments(const Segment_states* segment_states) | |
1492 | { | |
1493 | // Go through the segment list and remove any segment added in the | |
1494 | // relaxation loop. | |
1495 | this->tls_segment_ = NULL; | |
1496 | this->relro_segment_ = NULL; | |
1497 | Segment_list::iterator list_iter = this->segment_list_.begin(); | |
1498 | while (list_iter != this->segment_list_.end()) | |
1499 | { | |
1500 | Output_segment* segment = *list_iter; | |
1501 | Segment_states::const_iterator states_iter = | |
1502 | segment_states->find(segment); | |
1503 | if (states_iter != segment_states->end()) | |
1504 | { | |
1505 | const Output_segment* copy = states_iter->second; | |
1506 | // Shallow copy to restore states. | |
1507 | *segment = *copy; | |
1508 | ||
1509 | // Also fix up TLS and RELRO segment pointers as appropriate. | |
1510 | if (segment->type() == elfcpp::PT_TLS) | |
1511 | this->tls_segment_ = segment; | |
1512 | else if (segment->type() == elfcpp::PT_GNU_RELRO) | |
1513 | this->relro_segment_ = segment; | |
1514 | ||
1515 | ++list_iter; | |
1516 | } | |
1517 | else | |
1518 | { | |
1519 | list_iter = this->segment_list_.erase(list_iter); | |
1520 | // This is a segment created during section layout. It should be | |
1521 | // safe to remove it since we should have removed all pointers to it. | |
1522 | delete segment; | |
1523 | } | |
1524 | } | |
1525 | } | |
1526 | ||
1527 | // Clean up after relaxation so that sections can be laid out again. | |
1528 | ||
1529 | void | |
1530 | Layout::clean_up_after_relaxation() | |
1531 | { | |
1532 | // Restore the segments to point state just prior to the relaxation loop. | |
1533 | Script_sections* script_section = this->script_options_->script_sections(); | |
1534 | script_section->release_segments(); | |
1535 | this->restore_segments(this->segment_states_); | |
1536 | ||
1537 | // Reset section addresses and file offsets | |
1538 | for (Section_list::iterator p = this->section_list_.begin(); | |
1539 | p != this->section_list_.end(); | |
1540 | ++p) | |
1541 | { | |
20e6d0d6 | 1542 | (*p)->restore_states(); |
8923b24c DK |
1543 | |
1544 | // If an input section changes size because of relaxation, | |
1545 | // we need to adjust the section offsets of all input sections. | |
1546 | // after such a section. | |
1547 | if ((*p)->section_offsets_need_adjustment()) | |
1548 | (*p)->adjust_section_offsets(); | |
1549 | ||
1550 | (*p)->reset_address_and_file_offset(); | |
20e6d0d6 DK |
1551 | } |
1552 | ||
1553 | // Reset special output object address and file offsets. | |
1554 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
1555 | p != this->special_output_list_.end(); | |
1556 | ++p) | |
1557 | (*p)->reset_address_and_file_offset(); | |
1558 | ||
1559 | // A linker script may have created some output section data objects. | |
1560 | // They are useless now. | |
1561 | for (Output_section_data_list::const_iterator p = | |
1562 | this->script_output_section_data_list_.begin(); | |
1563 | p != this->script_output_section_data_list_.end(); | |
1564 | ++p) | |
1565 | delete *p; | |
1566 | this->script_output_section_data_list_.clear(); | |
1567 | } | |
1568 | ||
1569 | // Prepare for relaxation. | |
1570 | ||
1571 | void | |
1572 | Layout::prepare_for_relaxation() | |
1573 | { | |
1574 | // Create an relaxation debug check if in debugging mode. | |
1575 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
1576 | this->relaxation_debug_check_ = new Relaxation_debug_check(); | |
1577 | ||
1578 | // Save segment states. | |
1579 | this->segment_states_ = new Segment_states(); | |
1580 | this->save_segments(this->segment_states_); | |
1581 | ||
1582 | for(Section_list::const_iterator p = this->section_list_.begin(); | |
1583 | p != this->section_list_.end(); | |
1584 | ++p) | |
1585 | (*p)->save_states(); | |
1586 | ||
1587 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
1588 | this->relaxation_debug_check_->check_output_data_for_reset_values( | |
1589 | this->section_list_, this->special_output_list_); | |
1590 | ||
1591 | // Also enable recording of output section data from scripts. | |
1592 | this->record_output_section_data_from_script_ = true; | |
1593 | } | |
1594 | ||
1595 | // Relaxation loop body: If target has no relaxation, this runs only once | |
1596 | // Otherwise, the target relaxation hook is called at the end of | |
1597 | // each iteration. If the hook returns true, it means re-layout of | |
1598 | // section is required. | |
1599 | // | |
1600 | // The number of segments created by a linking script without a PHDRS | |
1601 | // clause may be affected by section sizes and alignments. There is | |
1602 | // a remote chance that relaxation causes different number of PT_LOAD | |
1603 | // segments are created and sections are attached to different segments. | |
1604 | // Therefore, we always throw away all segments created during section | |
1605 | // layout. In order to be able to restart the section layout, we keep | |
1606 | // a copy of the segment list right before the relaxation loop and use | |
1607 | // that to restore the segments. | |
1608 | // | |
1609 | // PASS is the current relaxation pass number. | |
1610 | // SYMTAB is a symbol table. | |
1611 | // PLOAD_SEG is the address of a pointer for the load segment. | |
1612 | // PHDR_SEG is a pointer to the PHDR segment. | |
1613 | // SEGMENT_HEADERS points to the output segment header. | |
1614 | // FILE_HEADER points to the output file header. | |
1615 | // PSHNDX is the address to store the output section index. | |
1616 | ||
1617 | off_t inline | |
1618 | Layout::relaxation_loop_body( | |
1619 | int pass, | |
1620 | Target* target, | |
1621 | Symbol_table* symtab, | |
1622 | Output_segment** pload_seg, | |
1623 | Output_segment* phdr_seg, | |
1624 | Output_segment_headers* segment_headers, | |
1625 | Output_file_header* file_header, | |
1626 | unsigned int* pshndx) | |
1627 | { | |
1628 | // If this is not the first iteration, we need to clean up after | |
1629 | // relaxation so that we can lay out the sections again. | |
1630 | if (pass != 0) | |
1631 | this->clean_up_after_relaxation(); | |
1632 | ||
1633 | // If there is a SECTIONS clause, put all the input sections into | |
1634 | // the required order. | |
1635 | Output_segment* load_seg; | |
1636 | if (this->script_options_->saw_sections_clause()) | |
1637 | load_seg = this->set_section_addresses_from_script(symtab); | |
1638 | else if (parameters->options().relocatable()) | |
1639 | load_seg = NULL; | |
1640 | else | |
1641 | load_seg = this->find_first_load_seg(); | |
1642 | ||
1643 | if (parameters->options().oformat_enum() | |
1644 | != General_options::OBJECT_FORMAT_ELF) | |
1645 | load_seg = NULL; | |
1646 | ||
403a15dd ILT |
1647 | // If the user set the address of the text segment, that may not be |
1648 | // compatible with putting the segment headers and file headers into | |
1649 | // that segment. | |
1650 | if (parameters->options().user_set_Ttext()) | |
1651 | load_seg = NULL; | |
1652 | ||
68b6574b ILT |
1653 | gold_assert(phdr_seg == NULL |
1654 | || load_seg != NULL | |
1655 | || this->script_options_->saw_sections_clause()); | |
20e6d0d6 | 1656 | |
a192ba05 ILT |
1657 | // If the address of the load segment we found has been set by |
1658 | // --section-start rather than by a script, then we don't want to | |
1659 | // use it for the file and segment headers. | |
1660 | if (load_seg != NULL | |
1661 | && load_seg->are_addresses_set() | |
1662 | && !this->script_options_->saw_sections_clause()) | |
1663 | load_seg = NULL; | |
1664 | ||
20e6d0d6 DK |
1665 | // Lay out the segment headers. |
1666 | if (!parameters->options().relocatable()) | |
1667 | { | |
1668 | gold_assert(segment_headers != NULL); | |
1669 | if (load_seg != NULL) | |
1670 | load_seg->add_initial_output_data(segment_headers); | |
1671 | if (phdr_seg != NULL) | |
1672 | phdr_seg->add_initial_output_data(segment_headers); | |
1673 | } | |
1674 | ||
1675 | // Lay out the file header. | |
1676 | if (load_seg != NULL) | |
1677 | load_seg->add_initial_output_data(file_header); | |
1678 | ||
1679 | if (this->script_options_->saw_phdrs_clause() | |
1680 | && !parameters->options().relocatable()) | |
1681 | { | |
1682 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS | |
1683 | // clause in a linker script. | |
1684 | Script_sections* ss = this->script_options_->script_sections(); | |
1685 | ss->put_headers_in_phdrs(file_header, segment_headers); | |
1686 | } | |
1687 | ||
1688 | // We set the output section indexes in set_segment_offsets and | |
1689 | // set_section_indexes. | |
1690 | *pshndx = 1; | |
1691 | ||
1692 | // Set the file offsets of all the segments, and all the sections | |
1693 | // they contain. | |
1694 | off_t off; | |
1695 | if (!parameters->options().relocatable()) | |
1696 | off = this->set_segment_offsets(target, load_seg, pshndx); | |
1697 | else | |
1698 | off = this->set_relocatable_section_offsets(file_header, pshndx); | |
1699 | ||
1700 | // Verify that the dummy relaxation does not change anything. | |
1701 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
1702 | { | |
1703 | if (pass == 0) | |
1704 | this->relaxation_debug_check_->read_sections(this->section_list_); | |
1705 | else | |
1706 | this->relaxation_debug_check_->verify_sections(this->section_list_); | |
1707 | } | |
1708 | ||
1709 | *pload_seg = load_seg; | |
1710 | return off; | |
1711 | } | |
1712 | ||
6e9ba2ca ST |
1713 | // Search the list of patterns and find the postion of the given section |
1714 | // name in the output section. If the section name matches a glob | |
1715 | // pattern and a non-glob name, then the non-glob position takes | |
1716 | // precedence. Return 0 if no match is found. | |
1717 | ||
1718 | unsigned int | |
1719 | Layout::find_section_order_index(const std::string& section_name) | |
1720 | { | |
1721 | Unordered_map<std::string, unsigned int>::iterator map_it; | |
1722 | map_it = this->input_section_position_.find(section_name); | |
1723 | if (map_it != this->input_section_position_.end()) | |
1724 | return map_it->second; | |
1725 | ||
1726 | // Absolute match failed. Linear search the glob patterns. | |
1727 | std::vector<std::string>::iterator it; | |
1728 | for (it = this->input_section_glob_.begin(); | |
1729 | it != this->input_section_glob_.end(); | |
1730 | ++it) | |
1731 | { | |
1732 | if (fnmatch((*it).c_str(), section_name.c_str(), FNM_NOESCAPE) == 0) | |
1733 | { | |
1734 | map_it = this->input_section_position_.find(*it); | |
1735 | gold_assert(map_it != this->input_section_position_.end()); | |
1736 | return map_it->second; | |
1737 | } | |
1738 | } | |
1739 | return 0; | |
1740 | } | |
1741 | ||
1742 | // Read the sequence of input sections from the file specified with | |
1743 | // --section-ordering-file. | |
1744 | ||
1745 | void | |
1746 | Layout::read_layout_from_file() | |
1747 | { | |
1748 | const char* filename = parameters->options().section_ordering_file(); | |
1749 | std::ifstream in; | |
1750 | std::string line; | |
1751 | ||
1752 | in.open(filename); | |
1753 | if (!in) | |
1754 | gold_fatal(_("unable to open --section-ordering-file file %s: %s"), | |
1755 | filename, strerror(errno)); | |
1756 | ||
1757 | std::getline(in, line); // this chops off the trailing \n, if any | |
1758 | unsigned int position = 1; | |
1759 | ||
1760 | while (in) | |
1761 | { | |
1762 | if (!line.empty() && line[line.length() - 1] == '\r') // Windows | |
1763 | line.resize(line.length() - 1); | |
1764 | // Ignore comments, beginning with '#' | |
1765 | if (line[0] == '#') | |
1766 | { | |
1767 | std::getline(in, line); | |
1768 | continue; | |
1769 | } | |
1770 | this->input_section_position_[line] = position; | |
1771 | // Store all glob patterns in a vector. | |
1772 | if (is_wildcard_string(line.c_str())) | |
1773 | this->input_section_glob_.push_back(line); | |
1774 | position++; | |
1775 | std::getline(in, line); | |
1776 | } | |
1777 | } | |
1778 | ||
54dc6425 ILT |
1779 | // Finalize the layout. When this is called, we have created all the |
1780 | // output sections and all the output segments which are based on | |
1781 | // input sections. We have several things to do, and we have to do | |
1782 | // them in the right order, so that we get the right results correctly | |
1783 | // and efficiently. | |
1784 | ||
1785 | // 1) Finalize the list of output segments and create the segment | |
1786 | // table header. | |
1787 | ||
1788 | // 2) Finalize the dynamic symbol table and associated sections. | |
1789 | ||
1790 | // 3) Determine the final file offset of all the output segments. | |
1791 | ||
1792 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
1793 | // sections. | |
1794 | ||
75f65a3e ILT |
1795 | // 5) Create the symbol table sections and the section name table |
1796 | // section. | |
1797 | ||
1798 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
1799 | // value and make a final determination of which symbols are going |
1800 | // into the output symbol table. | |
1801 | ||
54dc6425 ILT |
1802 | // 7) Create the section table header. |
1803 | ||
1804 | // 8) Determine the final file offset of all the output sections which | |
1805 | // are not SHF_ALLOC, including the section table header. | |
1806 | ||
1807 | // 9) Finalize the ELF file header. | |
1808 | ||
75f65a3e ILT |
1809 | // This function returns the size of the output file. |
1810 | ||
1811 | off_t | |
17a1d0a9 | 1812 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
8851ecca | 1813 | Target* target, const Task* task) |
54dc6425 | 1814 | { |
f59f41f3 | 1815 | target->finalize_sections(this, input_objects, symtab); |
5a6f7e2d | 1816 | |
17a1d0a9 | 1817 | this->count_local_symbols(task, input_objects); |
7bf1f802 | 1818 | |
1518dc8f | 1819 | this->link_stabs_sections(); |
4f211c8b | 1820 | |
3802b2dd | 1821 | Output_segment* phdr_seg = NULL; |
8851ecca | 1822 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
54dc6425 | 1823 | { |
dbe717ef ILT |
1824 | // There was a dynamic object in the link. We need to create |
1825 | // some information for the dynamic linker. | |
1826 | ||
3802b2dd ILT |
1827 | // Create the PT_PHDR segment which will hold the program |
1828 | // headers. | |
1c4f3631 ILT |
1829 | if (!this->script_options_->saw_phdrs_clause()) |
1830 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
3802b2dd | 1831 | |
14b31740 ILT |
1832 | // Create the dynamic symbol table, including the hash table. |
1833 | Output_section* dynstr; | |
1834 | std::vector<Symbol*> dynamic_symbols; | |
1835 | unsigned int local_dynamic_count; | |
a5dc0706 ILT |
1836 | Versions versions(*this->script_options()->version_script_info(), |
1837 | &this->dynpool_); | |
9b07f471 | 1838 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
14b31740 ILT |
1839 | &local_dynamic_count, &dynamic_symbols, |
1840 | &versions); | |
dbe717ef ILT |
1841 | |
1842 | // Create the .interp section to hold the name of the | |
1843 | // interpreter, and put it in a PT_INTERP segment. | |
8851ecca | 1844 | if (!parameters->options().shared()) |
96f2030e | 1845 | this->create_interp(target); |
a3ad94ed ILT |
1846 | |
1847 | // Finish the .dynamic section to hold the dynamic data, and put | |
1848 | // it in a PT_DYNAMIC segment. | |
16649710 | 1849 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
1850 | |
1851 | // We should have added everything we need to the dynamic string | |
1852 | // table. | |
1853 | this->dynpool_.set_string_offsets(); | |
1854 | ||
1855 | // Create the version sections. We can't do this until the | |
1856 | // dynamic string table is complete. | |
46fe1623 | 1857 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
14b31740 | 1858 | dynamic_symbols, dynstr); |
f0ba79e2 ILT |
1859 | |
1860 | // Set the size of the _DYNAMIC symbol. We can't do this until | |
1861 | // after we call create_version_sections. | |
1862 | this->set_dynamic_symbol_size(symtab); | |
54dc6425 | 1863 | } |
3ce2c28e ILT |
1864 | |
1865 | if (this->incremental_inputs_) | |
1866 | { | |
1867 | this->incremental_inputs_->finalize(); | |
1868 | this->create_incremental_info_sections(); | |
1869 | } | |
54dc6425 | 1870 | |
20e6d0d6 DK |
1871 | // Create segment headers. |
1872 | Output_segment_headers* segment_headers = | |
1873 | (parameters->options().relocatable() | |
1874 | ? NULL | |
1875 | : new Output_segment_headers(this->segment_list_)); | |
75f65a3e ILT |
1876 | |
1877 | // Lay out the file header. | |
20e6d0d6 DK |
1878 | Output_file_header* file_header |
1879 | = new Output_file_header(target, symtab, segment_headers, | |
1880 | parameters->options().entry()); | |
a445fddf | 1881 | |
61ba1cf9 | 1882 | this->special_output_list_.push_back(file_header); |
6a74a719 ILT |
1883 | if (segment_headers != NULL) |
1884 | this->special_output_list_.push_back(segment_headers); | |
75f65a3e | 1885 | |
20e6d0d6 DK |
1886 | // Find approriate places for orphan output sections if we are using |
1887 | // a linker script. | |
1888 | if (this->script_options_->saw_sections_clause()) | |
1889 | this->place_orphan_sections_in_script(); | |
1890 | ||
1891 | Output_segment* load_seg; | |
1892 | off_t off; | |
1893 | unsigned int shndx; | |
1894 | int pass = 0; | |
1895 | ||
1896 | // Take a snapshot of the section layout as needed. | |
1897 | if (target->may_relax()) | |
1898 | this->prepare_for_relaxation(); | |
1899 | ||
1900 | // Run the relaxation loop to lay out sections. | |
1901 | do | |
1c4f3631 | 1902 | { |
20e6d0d6 DK |
1903 | off = this->relaxation_loop_body(pass, target, symtab, &load_seg, |
1904 | phdr_seg, segment_headers, file_header, | |
1905 | &shndx); | |
1906 | pass++; | |
1c4f3631 | 1907 | } |
c0a62865 DK |
1908 | while (target->may_relax() |
1909 | && target->relax(pass, input_objects, symtab, this)); | |
75f65a3e | 1910 | |
a9a60db6 ILT |
1911 | // Set the file offsets of all the non-data sections we've seen so |
1912 | // far which don't have to wait for the input sections. We need | |
1913 | // this in order to finalize local symbols in non-allocated | |
1914 | // sections. | |
1915 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); | |
1916 | ||
d491d34e ILT |
1917 | // Set the section indexes of all unallocated sections seen so far, |
1918 | // in case any of them are somehow referenced by a symbol. | |
1919 | shndx = this->set_section_indexes(shndx); | |
1920 | ||
75f65a3e | 1921 | // Create the symbol table sections. |
d491d34e | 1922 | this->create_symtab_sections(input_objects, symtab, shndx, &off); |
7bf1f802 ILT |
1923 | if (!parameters->doing_static_link()) |
1924 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e | 1925 | |
e5756efb ILT |
1926 | // Process any symbol assignments from a linker script. This must |
1927 | // be called after the symbol table has been finalized. | |
1928 | this->script_options_->finalize_symbols(symtab, this); | |
1929 | ||
75f65a3e ILT |
1930 | // Create the .shstrtab section. |
1931 | Output_section* shstrtab_section = this->create_shstrtab(); | |
1932 | ||
a9a60db6 ILT |
1933 | // Set the file offsets of the rest of the non-data sections which |
1934 | // don't have to wait for the input sections. | |
9a0910c3 | 1935 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 | 1936 | |
d491d34e ILT |
1937 | // Now that all sections have been created, set the section indexes |
1938 | // for any sections which haven't been done yet. | |
86887060 | 1939 | shndx = this->set_section_indexes(shndx); |
ead1e424 | 1940 | |
75f65a3e | 1941 | // Create the section table header. |
d491d34e | 1942 | this->create_shdrs(shstrtab_section, &off); |
75f65a3e | 1943 | |
17a1d0a9 ILT |
1944 | // If there are no sections which require postprocessing, we can |
1945 | // handle the section names now, and avoid a resize later. | |
1946 | if (!this->any_postprocessing_sections_) | |
1947 | off = this->set_section_offsets(off, | |
1948 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
1949 | ||
27bc2bce | 1950 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 1951 | |
27bc2bce ILT |
1952 | // Now we know exactly where everything goes in the output file |
1953 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 1954 | Output_data::layout_complete(); |
75f65a3e | 1955 | |
e44fcf3b ILT |
1956 | this->output_file_size_ = off; |
1957 | ||
75f65a3e ILT |
1958 | return off; |
1959 | } | |
1960 | ||
8ed814a9 | 1961 | // Create a note header following the format defined in the ELF ABI. |
ec3f783e ILT |
1962 | // NAME is the name, NOTE_TYPE is the type, SECTION_NAME is the name |
1963 | // of the section to create, DESCSZ is the size of the descriptor. | |
1964 | // ALLOCATE is true if the section should be allocated in memory. | |
1965 | // This returns the new note section. It sets *TRAILING_PADDING to | |
1966 | // the number of trailing zero bytes required. | |
4f211c8b | 1967 | |
8ed814a9 | 1968 | Output_section* |
ef4ab7a8 PP |
1969 | Layout::create_note(const char* name, int note_type, |
1970 | const char* section_name, size_t descsz, | |
8ed814a9 | 1971 | bool allocate, size_t* trailing_padding) |
4f211c8b | 1972 | { |
e2305dc0 ILT |
1973 | // Authorities all agree that the values in a .note field should |
1974 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
1975 | // they differ on what the alignment is for 64-bit binaries. | |
1976 | // The GABI says unambiguously they take 8-byte alignment: | |
1977 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
1978 | // Other documentation says alignment should always be 4 bytes: | |
1979 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
1980 | // GNU ld and GNU readelf both support the latter (at least as of | |
1981 | // version 2.16.91), and glibc always generates the latter for | |
1982 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
1983 | // here. | |
35cdfc9a | 1984 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
8851ecca | 1985 | const int size = parameters->target().get_size(); |
e2305dc0 ILT |
1986 | #else |
1987 | const int size = 32; | |
1988 | #endif | |
4f211c8b ILT |
1989 | |
1990 | // The contents of the .note section. | |
4f211c8b ILT |
1991 | size_t namesz = strlen(name) + 1; |
1992 | size_t aligned_namesz = align_address(namesz, size / 8); | |
4f211c8b | 1993 | size_t aligned_descsz = align_address(descsz, size / 8); |
4f211c8b | 1994 | |
8ed814a9 | 1995 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
4f211c8b | 1996 | |
8ed814a9 ILT |
1997 | unsigned char* buffer = new unsigned char[notehdrsz]; |
1998 | memset(buffer, 0, notehdrsz); | |
4f211c8b | 1999 | |
8851ecca | 2000 | bool is_big_endian = parameters->target().is_big_endian(); |
4f211c8b ILT |
2001 | |
2002 | if (size == 32) | |
2003 | { | |
2004 | if (!is_big_endian) | |
2005 | { | |
2006 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
2007 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
2008 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
2009 | } | |
2010 | else | |
2011 | { | |
2012 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
2013 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
2014 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
2015 | } | |
2016 | } | |
2017 | else if (size == 64) | |
2018 | { | |
2019 | if (!is_big_endian) | |
2020 | { | |
2021 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
2022 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
2023 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
2024 | } | |
2025 | else | |
2026 | { | |
2027 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
2028 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
2029 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
2030 | } | |
2031 | } | |
2032 | else | |
2033 | gold_unreachable(); | |
2034 | ||
2035 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
4f211c8b | 2036 | |
8ed814a9 | 2037 | elfcpp::Elf_Xword flags = 0; |
22f0da72 | 2038 | Output_section_order order = ORDER_INVALID; |
8ed814a9 | 2039 | if (allocate) |
22f0da72 ILT |
2040 | { |
2041 | flags = elfcpp::SHF_ALLOC; | |
2042 | order = ORDER_RO_NOTE; | |
2043 | } | |
ec3f783e ILT |
2044 | Output_section* os = this->choose_output_section(NULL, section_name, |
2045 | elfcpp::SHT_NOTE, | |
22f0da72 | 2046 | flags, false, order, false); |
9c547ec3 ILT |
2047 | if (os == NULL) |
2048 | return NULL; | |
2049 | ||
8ed814a9 | 2050 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, |
7d9e3d98 ILT |
2051 | size / 8, |
2052 | "** note header"); | |
8ed814a9 ILT |
2053 | os->add_output_section_data(posd); |
2054 | ||
2055 | *trailing_padding = aligned_descsz - descsz; | |
2056 | ||
2057 | return os; | |
2058 | } | |
2059 | ||
2060 | // For an executable or shared library, create a note to record the | |
2061 | // version of gold used to create the binary. | |
2062 | ||
2063 | void | |
2064 | Layout::create_gold_note() | |
2065 | { | |
2066 | if (parameters->options().relocatable()) | |
2067 | return; | |
2068 | ||
2069 | std::string desc = std::string("gold ") + gold::get_version_string(); | |
2070 | ||
2071 | size_t trailing_padding; | |
2072 | Output_section *os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, | |
ef4ab7a8 PP |
2073 | ".note.gnu.gold-version", desc.size(), |
2074 | false, &trailing_padding); | |
9c547ec3 ILT |
2075 | if (os == NULL) |
2076 | return; | |
8ed814a9 ILT |
2077 | |
2078 | Output_section_data* posd = new Output_data_const(desc, 4); | |
4f211c8b | 2079 | os->add_output_section_data(posd); |
8ed814a9 ILT |
2080 | |
2081 | if (trailing_padding > 0) | |
2082 | { | |
7d9e3d98 | 2083 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
2084 | os->add_output_section_data(posd); |
2085 | } | |
4f211c8b ILT |
2086 | } |
2087 | ||
35cdfc9a ILT |
2088 | // Record whether the stack should be executable. This can be set |
2089 | // from the command line using the -z execstack or -z noexecstack | |
2090 | // options. Otherwise, if any input file has a .note.GNU-stack | |
2091 | // section with the SHF_EXECINSTR flag set, the stack should be | |
2092 | // executable. Otherwise, if at least one input file a | |
2093 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
2094 | // section, we use the target default for whether the stack should be | |
2095 | // executable. Otherwise, we don't generate a stack note. When | |
2096 | // generating a object file, we create a .note.GNU-stack section with | |
2097 | // the appropriate marking. When generating an executable or shared | |
2098 | // library, we create a PT_GNU_STACK segment. | |
2099 | ||
2100 | void | |
9c547ec3 | 2101 | Layout::create_executable_stack_info() |
35cdfc9a ILT |
2102 | { |
2103 | bool is_stack_executable; | |
e55bde5e ILT |
2104 | if (parameters->options().is_execstack_set()) |
2105 | is_stack_executable = parameters->options().is_stack_executable(); | |
35cdfc9a ILT |
2106 | else if (!this->input_with_gnu_stack_note_) |
2107 | return; | |
2108 | else | |
2109 | { | |
2110 | if (this->input_requires_executable_stack_) | |
2111 | is_stack_executable = true; | |
2112 | else if (this->input_without_gnu_stack_note_) | |
9c547ec3 ILT |
2113 | is_stack_executable = |
2114 | parameters->target().is_default_stack_executable(); | |
35cdfc9a ILT |
2115 | else |
2116 | is_stack_executable = false; | |
2117 | } | |
2118 | ||
8851ecca | 2119 | if (parameters->options().relocatable()) |
35cdfc9a ILT |
2120 | { |
2121 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
2122 | elfcpp::Elf_Xword flags = 0; | |
2123 | if (is_stack_executable) | |
2124 | flags |= elfcpp::SHF_EXECINSTR; | |
22f0da72 ILT |
2125 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags, |
2126 | ORDER_INVALID, false); | |
35cdfc9a ILT |
2127 | } |
2128 | else | |
2129 | { | |
1c4f3631 ILT |
2130 | if (this->script_options_->saw_phdrs_clause()) |
2131 | return; | |
35cdfc9a ILT |
2132 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
2133 | if (is_stack_executable) | |
2134 | flags |= elfcpp::PF_X; | |
3802b2dd | 2135 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); |
35cdfc9a ILT |
2136 | } |
2137 | } | |
2138 | ||
8ed814a9 ILT |
2139 | // If --build-id was used, set up the build ID note. |
2140 | ||
2141 | void | |
2142 | Layout::create_build_id() | |
2143 | { | |
2144 | if (!parameters->options().user_set_build_id()) | |
2145 | return; | |
2146 | ||
2147 | const char* style = parameters->options().build_id(); | |
2148 | if (strcmp(style, "none") == 0) | |
2149 | return; | |
2150 | ||
2151 | // Set DESCSZ to the size of the note descriptor. When possible, | |
2152 | // set DESC to the note descriptor contents. | |
2153 | size_t descsz; | |
2154 | std::string desc; | |
2155 | if (strcmp(style, "md5") == 0) | |
2156 | descsz = 128 / 8; | |
2157 | else if (strcmp(style, "sha1") == 0) | |
2158 | descsz = 160 / 8; | |
2159 | else if (strcmp(style, "uuid") == 0) | |
2160 | { | |
2161 | const size_t uuidsz = 128 / 8; | |
2162 | ||
2163 | char buffer[uuidsz]; | |
2164 | memset(buffer, 0, uuidsz); | |
2165 | ||
2a00e4fb | 2166 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
8ed814a9 ILT |
2167 | if (descriptor < 0) |
2168 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), | |
2169 | strerror(errno)); | |
2170 | else | |
2171 | { | |
2172 | ssize_t got = ::read(descriptor, buffer, uuidsz); | |
2a00e4fb | 2173 | release_descriptor(descriptor, true); |
8ed814a9 ILT |
2174 | if (got < 0) |
2175 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); | |
2176 | else if (static_cast<size_t>(got) != uuidsz) | |
2177 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), | |
2178 | uuidsz, got); | |
2179 | } | |
2180 | ||
2181 | desc.assign(buffer, uuidsz); | |
2182 | descsz = uuidsz; | |
2183 | } | |
2184 | else if (strncmp(style, "0x", 2) == 0) | |
2185 | { | |
2186 | hex_init(); | |
2187 | const char* p = style + 2; | |
2188 | while (*p != '\0') | |
2189 | { | |
2190 | if (hex_p(p[0]) && hex_p(p[1])) | |
2191 | { | |
2192 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); | |
2193 | desc += c; | |
2194 | p += 2; | |
2195 | } | |
2196 | else if (*p == '-' || *p == ':') | |
2197 | ++p; | |
2198 | else | |
2199 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), | |
2200 | style); | |
2201 | } | |
2202 | descsz = desc.size(); | |
2203 | } | |
2204 | else | |
2205 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); | |
2206 | ||
2207 | // Create the note. | |
2208 | size_t trailing_padding; | |
2209 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, | |
ef4ab7a8 PP |
2210 | ".note.gnu.build-id", descsz, true, |
2211 | &trailing_padding); | |
9c547ec3 ILT |
2212 | if (os == NULL) |
2213 | return; | |
8ed814a9 ILT |
2214 | |
2215 | if (!desc.empty()) | |
2216 | { | |
2217 | // We know the value already, so we fill it in now. | |
2218 | gold_assert(desc.size() == descsz); | |
2219 | ||
2220 | Output_section_data* posd = new Output_data_const(desc, 4); | |
2221 | os->add_output_section_data(posd); | |
2222 | ||
2223 | if (trailing_padding != 0) | |
2224 | { | |
7d9e3d98 | 2225 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
2226 | os->add_output_section_data(posd); |
2227 | } | |
2228 | } | |
2229 | else | |
2230 | { | |
2231 | // We need to compute a checksum after we have completed the | |
2232 | // link. | |
2233 | gold_assert(trailing_padding == 0); | |
7d9e3d98 | 2234 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
8ed814a9 | 2235 | os->add_output_section_data(this->build_id_note_); |
8ed814a9 ILT |
2236 | } |
2237 | } | |
2238 | ||
1518dc8f ILT |
2239 | // If we have both .stabXX and .stabXXstr sections, then the sh_link |
2240 | // field of the former should point to the latter. I'm not sure who | |
2241 | // started this, but the GNU linker does it, and some tools depend | |
2242 | // upon it. | |
2243 | ||
2244 | void | |
2245 | Layout::link_stabs_sections() | |
2246 | { | |
2247 | if (!this->have_stabstr_section_) | |
2248 | return; | |
2249 | ||
2250 | for (Section_list::iterator p = this->section_list_.begin(); | |
2251 | p != this->section_list_.end(); | |
2252 | ++p) | |
2253 | { | |
2254 | if ((*p)->type() != elfcpp::SHT_STRTAB) | |
2255 | continue; | |
2256 | ||
2257 | const char* name = (*p)->name(); | |
2258 | if (strncmp(name, ".stab", 5) != 0) | |
2259 | continue; | |
2260 | ||
2261 | size_t len = strlen(name); | |
2262 | if (strcmp(name + len - 3, "str") != 0) | |
2263 | continue; | |
2264 | ||
2265 | std::string stab_name(name, len - 3); | |
2266 | Output_section* stab_sec; | |
2267 | stab_sec = this->find_output_section(stab_name.c_str()); | |
2268 | if (stab_sec != NULL) | |
2269 | stab_sec->set_link_section(*p); | |
2270 | } | |
2271 | } | |
2272 | ||
3ce2c28e ILT |
2273 | // Create .gnu_incremental_inputs and .gnu_incremental_strtab sections needed |
2274 | // for the next run of incremental linking to check what has changed. | |
2275 | ||
2276 | void | |
2277 | Layout::create_incremental_info_sections() | |
2278 | { | |
2279 | gold_assert(this->incremental_inputs_ != NULL); | |
2280 | ||
2281 | // Add the .gnu_incremental_inputs section. | |
2282 | const char *incremental_inputs_name = | |
2283 | this->namepool_.add(".gnu_incremental_inputs", false, NULL); | |
2284 | Output_section* inputs_os = | |
2285 | this->make_output_section(incremental_inputs_name, | |
f5c870d2 | 2286 | elfcpp::SHT_GNU_INCREMENTAL_INPUTS, 0, |
22f0da72 | 2287 | ORDER_INVALID, false); |
3ce2c28e ILT |
2288 | Output_section_data* posd = |
2289 | this->incremental_inputs_->create_incremental_inputs_section_data(); | |
2290 | inputs_os->add_output_section_data(posd); | |
2291 | ||
2292 | // Add the .gnu_incremental_strtab section. | |
2293 | const char *incremental_strtab_name = | |
2294 | this->namepool_.add(".gnu_incremental_strtab", false, NULL); | |
2295 | Output_section* strtab_os = this->make_output_section(incremental_strtab_name, | |
2296 | elfcpp::SHT_STRTAB, | |
22f0da72 ILT |
2297 | 0, ORDER_INVALID, |
2298 | false); | |
3ce2c28e ILT |
2299 | Output_data_strtab* strtab_data = |
2300 | new Output_data_strtab(this->incremental_inputs_->get_stringpool()); | |
2301 | strtab_os->add_output_section_data(strtab_data); | |
2302 | ||
2303 | inputs_os->set_link_section(strtab_data); | |
2304 | } | |
2305 | ||
75f65a3e ILT |
2306 | // Return whether SEG1 should be before SEG2 in the output file. This |
2307 | // is based entirely on the segment type and flags. When this is | |
2308 | // called the segment addresses has normally not yet been set. | |
2309 | ||
2310 | bool | |
2311 | Layout::segment_precedes(const Output_segment* seg1, | |
2312 | const Output_segment* seg2) | |
2313 | { | |
2314 | elfcpp::Elf_Word type1 = seg1->type(); | |
2315 | elfcpp::Elf_Word type2 = seg2->type(); | |
2316 | ||
2317 | // The single PT_PHDR segment is required to precede any loadable | |
2318 | // segment. We simply make it always first. | |
2319 | if (type1 == elfcpp::PT_PHDR) | |
2320 | { | |
a3ad94ed | 2321 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
2322 | return true; |
2323 | } | |
2324 | if (type2 == elfcpp::PT_PHDR) | |
2325 | return false; | |
2326 | ||
2327 | // The single PT_INTERP segment is required to precede any loadable | |
2328 | // segment. We simply make it always second. | |
2329 | if (type1 == elfcpp::PT_INTERP) | |
2330 | { | |
a3ad94ed | 2331 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
2332 | return true; |
2333 | } | |
2334 | if (type2 == elfcpp::PT_INTERP) | |
2335 | return false; | |
2336 | ||
2337 | // We then put PT_LOAD segments before any other segments. | |
2338 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
2339 | return true; | |
2340 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
2341 | return false; | |
2342 | ||
9f1d377b ILT |
2343 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
2344 | // segment, because that is where the dynamic linker expects to find | |
2345 | // it (this is just for efficiency; other positions would also work | |
2346 | // correctly). | |
2347 | if (type1 == elfcpp::PT_TLS | |
2348 | && type2 != elfcpp::PT_TLS | |
2349 | && type2 != elfcpp::PT_GNU_RELRO) | |
2350 | return false; | |
2351 | if (type2 == elfcpp::PT_TLS | |
2352 | && type1 != elfcpp::PT_TLS | |
2353 | && type1 != elfcpp::PT_GNU_RELRO) | |
2354 | return true; | |
2355 | ||
2356 | // We put the PT_GNU_RELRO segment last, because that is where the | |
2357 | // dynamic linker expects to find it (as with PT_TLS, this is just | |
2358 | // for efficiency). | |
2359 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) | |
92e059d8 | 2360 | return false; |
9f1d377b | 2361 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
92e059d8 ILT |
2362 | return true; |
2363 | ||
75f65a3e ILT |
2364 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
2365 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
2366 | ||
2367 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
2368 | // by the numeric segment type and flags values. There should not | |
2369 | // be more than one segment with the same type and flags. | |
2370 | if (type1 != elfcpp::PT_LOAD) | |
2371 | { | |
2372 | if (type1 != type2) | |
2373 | return type1 < type2; | |
a3ad94ed | 2374 | gold_assert(flags1 != flags2); |
75f65a3e ILT |
2375 | return flags1 < flags2; |
2376 | } | |
2377 | ||
a445fddf ILT |
2378 | // If the addresses are set already, sort by load address. |
2379 | if (seg1->are_addresses_set()) | |
2380 | { | |
2381 | if (!seg2->are_addresses_set()) | |
2382 | return true; | |
2383 | ||
2384 | unsigned int section_count1 = seg1->output_section_count(); | |
2385 | unsigned int section_count2 = seg2->output_section_count(); | |
2386 | if (section_count1 == 0 && section_count2 > 0) | |
2387 | return true; | |
2388 | if (section_count1 > 0 && section_count2 == 0) | |
2389 | return false; | |
2390 | ||
2391 | uint64_t paddr1 = seg1->first_section_load_address(); | |
2392 | uint64_t paddr2 = seg2->first_section_load_address(); | |
2393 | if (paddr1 != paddr2) | |
2394 | return paddr1 < paddr2; | |
2395 | } | |
2396 | else if (seg2->are_addresses_set()) | |
2397 | return false; | |
2398 | ||
8a5e3e08 ILT |
2399 | // A segment which holds large data comes after a segment which does |
2400 | // not hold large data. | |
2401 | if (seg1->is_large_data_segment()) | |
2402 | { | |
2403 | if (!seg2->is_large_data_segment()) | |
2404 | return false; | |
2405 | } | |
2406 | else if (seg2->is_large_data_segment()) | |
2407 | return true; | |
2408 | ||
2409 | // Otherwise, we sort PT_LOAD segments based on the flags. Readonly | |
2410 | // segments come before writable segments. Then writable segments | |
2411 | // with data come before writable segments without data. Then | |
2412 | // executable segments come before non-executable segments. Then | |
2413 | // the unlikely case of a non-readable segment comes before the | |
2414 | // normal case of a readable segment. If there are multiple | |
2415 | // segments with the same type and flags, we require that the | |
2416 | // address be set, and we sort by virtual address and then physical | |
2417 | // address. | |
75f65a3e ILT |
2418 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
2419 | return (flags1 & elfcpp::PF_W) == 0; | |
756ac4a8 ILT |
2420 | if ((flags1 & elfcpp::PF_W) != 0 |
2421 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) | |
2422 | return seg1->has_any_data_sections(); | |
75f65a3e ILT |
2423 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
2424 | return (flags1 & elfcpp::PF_X) != 0; | |
2425 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
2426 | return (flags1 & elfcpp::PF_R) == 0; | |
2427 | ||
a445fddf ILT |
2428 | // We shouldn't get here--we shouldn't create segments which we |
2429 | // can't distinguish. | |
2430 | gold_unreachable(); | |
75f65a3e ILT |
2431 | } |
2432 | ||
8a5e3e08 ILT |
2433 | // Increase OFF so that it is congruent to ADDR modulo ABI_PAGESIZE. |
2434 | ||
2435 | static off_t | |
2436 | align_file_offset(off_t off, uint64_t addr, uint64_t abi_pagesize) | |
2437 | { | |
2438 | uint64_t unsigned_off = off; | |
2439 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) | |
2440 | | (addr & (abi_pagesize - 1))); | |
2441 | if (aligned_off < unsigned_off) | |
2442 | aligned_off += abi_pagesize; | |
2443 | return aligned_off; | |
2444 | } | |
2445 | ||
ead1e424 ILT |
2446 | // Set the file offsets of all the segments, and all the sections they |
2447 | // contain. They have all been created. LOAD_SEG must be be laid out | |
2448 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
2449 | |
2450 | off_t | |
ead1e424 ILT |
2451 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
2452 | unsigned int *pshndx) | |
75f65a3e ILT |
2453 | { |
2454 | // Sort them into the final order. | |
54dc6425 ILT |
2455 | std::sort(this->segment_list_.begin(), this->segment_list_.end(), |
2456 | Layout::Compare_segments()); | |
2457 | ||
75f65a3e ILT |
2458 | // Find the PT_LOAD segments, and set their addresses and offsets |
2459 | // and their section's addresses and offsets. | |
0c5e9c22 | 2460 | uint64_t addr; |
e55bde5e ILT |
2461 | if (parameters->options().user_set_Ttext()) |
2462 | addr = parameters->options().Ttext(); | |
374ad285 | 2463 | else if (parameters->options().output_is_position_independent()) |
a445fddf | 2464 | addr = 0; |
0c5e9c22 ILT |
2465 | else |
2466 | addr = target->default_text_segment_address(); | |
75f65a3e | 2467 | off_t off = 0; |
a445fddf ILT |
2468 | |
2469 | // If LOAD_SEG is NULL, then the file header and segment headers | |
2470 | // will not be loadable. But they still need to be at offset 0 in | |
2471 | // the file. Set their offsets now. | |
2472 | if (load_seg == NULL) | |
2473 | { | |
2474 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
2475 | p != this->special_output_list_.end(); | |
2476 | ++p) | |
2477 | { | |
2478 | off = align_address(off, (*p)->addralign()); | |
2479 | (*p)->set_address_and_file_offset(0, off); | |
2480 | off += (*p)->data_size(); | |
2481 | } | |
2482 | } | |
2483 | ||
1a2dff53 ILT |
2484 | unsigned int increase_relro = this->increase_relro_; |
2485 | if (this->script_options_->saw_sections_clause()) | |
2486 | increase_relro = 0; | |
2487 | ||
34810851 ILT |
2488 | const bool check_sections = parameters->options().check_sections(); |
2489 | Output_segment* last_load_segment = NULL; | |
2490 | ||
75f65a3e ILT |
2491 | bool was_readonly = false; |
2492 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
2493 | p != this->segment_list_.end(); | |
2494 | ++p) | |
2495 | { | |
2496 | if ((*p)->type() == elfcpp::PT_LOAD) | |
2497 | { | |
2498 | if (load_seg != NULL && load_seg != *p) | |
a3ad94ed | 2499 | gold_unreachable(); |
75f65a3e ILT |
2500 | load_seg = NULL; |
2501 | ||
756ac4a8 ILT |
2502 | bool are_addresses_set = (*p)->are_addresses_set(); |
2503 | if (are_addresses_set) | |
2504 | { | |
2505 | // When it comes to setting file offsets, we care about | |
2506 | // the physical address. | |
2507 | addr = (*p)->paddr(); | |
2508 | } | |
e55bde5e | 2509 | else if (parameters->options().user_set_Tdata() |
756ac4a8 | 2510 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
e55bde5e | 2511 | && (!parameters->options().user_set_Tbss() |
756ac4a8 ILT |
2512 | || (*p)->has_any_data_sections())) |
2513 | { | |
e55bde5e | 2514 | addr = parameters->options().Tdata(); |
756ac4a8 ILT |
2515 | are_addresses_set = true; |
2516 | } | |
e55bde5e | 2517 | else if (parameters->options().user_set_Tbss() |
756ac4a8 ILT |
2518 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
2519 | && !(*p)->has_any_data_sections()) | |
2520 | { | |
e55bde5e | 2521 | addr = parameters->options().Tbss(); |
756ac4a8 ILT |
2522 | are_addresses_set = true; |
2523 | } | |
2524 | ||
75f65a3e ILT |
2525 | uint64_t orig_addr = addr; |
2526 | uint64_t orig_off = off; | |
2527 | ||
a445fddf | 2528 | uint64_t aligned_addr = 0; |
75f65a3e | 2529 | uint64_t abi_pagesize = target->abi_pagesize(); |
af6156ef | 2530 | uint64_t common_pagesize = target->common_pagesize(); |
0496d5e5 | 2531 | |
af6156ef ILT |
2532 | if (!parameters->options().nmagic() |
2533 | && !parameters->options().omagic()) | |
2534 | (*p)->set_minimum_p_align(common_pagesize); | |
0496d5e5 | 2535 | |
8a5e3e08 | 2536 | if (!are_addresses_set) |
a445fddf ILT |
2537 | { |
2538 | // If the last segment was readonly, and this one is | |
2539 | // not, then skip the address forward one page, | |
2540 | // maintaining the same position within the page. This | |
2541 | // lets us store both segments overlapping on a single | |
2542 | // page in the file, but the loader will put them on | |
2543 | // different pages in memory. | |
2544 | ||
2545 | addr = align_address(addr, (*p)->maximum_alignment()); | |
75f65a3e | 2546 | aligned_addr = addr; |
a445fddf ILT |
2547 | |
2548 | if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0) | |
2549 | { | |
2550 | if ((addr & (abi_pagesize - 1)) != 0) | |
2551 | addr = addr + abi_pagesize; | |
2552 | } | |
2553 | ||
2554 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); | |
75f65a3e ILT |
2555 | } |
2556 | ||
8a5e3e08 ILT |
2557 | if (!parameters->options().nmagic() |
2558 | && !parameters->options().omagic()) | |
2559 | off = align_file_offset(off, addr, abi_pagesize); | |
661be1e2 ILT |
2560 | else if (load_seg == NULL) |
2561 | { | |
2562 | // This is -N or -n with a section script which prevents | |
2563 | // us from using a load segment. We need to ensure that | |
2564 | // the file offset is aligned to the alignment of the | |
2565 | // segment. This is because the linker script | |
2566 | // implicitly assumed a zero offset. If we don't align | |
2567 | // here, then the alignment of the sections in the | |
2568 | // linker script may not match the alignment of the | |
2569 | // sections in the set_section_addresses call below, | |
2570 | // causing an error about dot moving backward. | |
2571 | off = align_address(off, (*p)->maximum_alignment()); | |
2572 | } | |
8a5e3e08 | 2573 | |
ead1e424 | 2574 | unsigned int shndx_hold = *pshndx; |
96a2b4e4 | 2575 | uint64_t new_addr = (*p)->set_section_addresses(this, false, addr, |
1a2dff53 | 2576 | increase_relro, |
96a2b4e4 | 2577 | &off, pshndx); |
75f65a3e ILT |
2578 | |
2579 | // Now that we know the size of this segment, we may be able | |
2580 | // to save a page in memory, at the cost of wasting some | |
2581 | // file space, by instead aligning to the start of a new | |
2582 | // page. Here we use the real machine page size rather than | |
2583 | // the ABI mandated page size. | |
2584 | ||
a445fddf | 2585 | if (!are_addresses_set && aligned_addr != addr) |
75f65a3e | 2586 | { |
75f65a3e ILT |
2587 | uint64_t first_off = (common_pagesize |
2588 | - (aligned_addr | |
2589 | & (common_pagesize - 1))); | |
2590 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
2591 | if (first_off > 0 | |
2592 | && last_off > 0 | |
2593 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
2594 | != (new_addr & ~ (common_pagesize - 1))) | |
2595 | && first_off + last_off <= common_pagesize) | |
2596 | { | |
ead1e424 ILT |
2597 | *pshndx = shndx_hold; |
2598 | addr = align_address(aligned_addr, common_pagesize); | |
a445fddf | 2599 | addr = align_address(addr, (*p)->maximum_alignment()); |
75f65a3e | 2600 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
8a5e3e08 | 2601 | off = align_file_offset(off, addr, abi_pagesize); |
96a2b4e4 | 2602 | new_addr = (*p)->set_section_addresses(this, true, addr, |
1a2dff53 | 2603 | increase_relro, |
96a2b4e4 | 2604 | &off, pshndx); |
75f65a3e ILT |
2605 | } |
2606 | } | |
2607 | ||
2608 | addr = new_addr; | |
2609 | ||
2610 | if (((*p)->flags() & elfcpp::PF_W) == 0) | |
2611 | was_readonly = true; | |
34810851 ILT |
2612 | |
2613 | // Implement --check-sections. We know that the segments | |
2614 | // are sorted by LMA. | |
2615 | if (check_sections && last_load_segment != NULL) | |
2616 | { | |
2617 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); | |
2618 | if (last_load_segment->paddr() + last_load_segment->memsz() | |
2619 | > (*p)->paddr()) | |
2620 | { | |
2621 | unsigned long long lb1 = last_load_segment->paddr(); | |
2622 | unsigned long long le1 = lb1 + last_load_segment->memsz(); | |
2623 | unsigned long long lb2 = (*p)->paddr(); | |
2624 | unsigned long long le2 = lb2 + (*p)->memsz(); | |
2625 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " | |
2626 | "[0x%llx -> 0x%llx]"), | |
2627 | lb1, le1, lb2, le2); | |
2628 | } | |
2629 | } | |
2630 | last_load_segment = *p; | |
75f65a3e ILT |
2631 | } |
2632 | } | |
2633 | ||
2634 | // Handle the non-PT_LOAD segments, setting their offsets from their | |
2635 | // section's offsets. | |
2636 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
2637 | p != this->segment_list_.end(); | |
2638 | ++p) | |
2639 | { | |
2640 | if ((*p)->type() != elfcpp::PT_LOAD) | |
1a2dff53 ILT |
2641 | (*p)->set_offset((*p)->type() == elfcpp::PT_GNU_RELRO |
2642 | ? increase_relro | |
2643 | : 0); | |
75f65a3e ILT |
2644 | } |
2645 | ||
7bf1f802 ILT |
2646 | // Set the TLS offsets for each section in the PT_TLS segment. |
2647 | if (this->tls_segment_ != NULL) | |
2648 | this->tls_segment_->set_tls_offsets(); | |
2649 | ||
75f65a3e ILT |
2650 | return off; |
2651 | } | |
2652 | ||
6a74a719 ILT |
2653 | // Set the offsets of all the allocated sections when doing a |
2654 | // relocatable link. This does the same jobs as set_segment_offsets, | |
2655 | // only for a relocatable link. | |
2656 | ||
2657 | off_t | |
2658 | Layout::set_relocatable_section_offsets(Output_data* file_header, | |
2659 | unsigned int *pshndx) | |
2660 | { | |
2661 | off_t off = 0; | |
2662 | ||
2663 | file_header->set_address_and_file_offset(0, 0); | |
2664 | off += file_header->data_size(); | |
2665 | ||
2666 | for (Section_list::iterator p = this->section_list_.begin(); | |
2667 | p != this->section_list_.end(); | |
2668 | ++p) | |
2669 | { | |
2670 | // We skip unallocated sections here, except that group sections | |
2671 | // have to come first. | |
2672 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 | |
2673 | && (*p)->type() != elfcpp::SHT_GROUP) | |
2674 | continue; | |
2675 | ||
2676 | off = align_address(off, (*p)->addralign()); | |
2677 | ||
2678 | // The linker script might have set the address. | |
2679 | if (!(*p)->is_address_valid()) | |
2680 | (*p)->set_address(0); | |
2681 | (*p)->set_file_offset(off); | |
2682 | (*p)->finalize_data_size(); | |
2683 | off += (*p)->data_size(); | |
2684 | ||
2685 | (*p)->set_out_shndx(*pshndx); | |
2686 | ++*pshndx; | |
2687 | } | |
2688 | ||
2689 | return off; | |
2690 | } | |
2691 | ||
75f65a3e ILT |
2692 | // Set the file offset of all the sections not associated with a |
2693 | // segment. | |
2694 | ||
2695 | off_t | |
9a0910c3 | 2696 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 2697 | { |
a3ad94ed ILT |
2698 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
2699 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
2700 | ++p) |
2701 | { | |
27bc2bce ILT |
2702 | // The symtab section is handled in create_symtab_sections. |
2703 | if (*p == this->symtab_section_) | |
61ba1cf9 | 2704 | continue; |
27bc2bce | 2705 | |
a9a60db6 ILT |
2706 | // If we've already set the data size, don't set it again. |
2707 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) | |
2708 | continue; | |
2709 | ||
96803768 ILT |
2710 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2711 | && (*p)->requires_postprocessing()) | |
17a1d0a9 ILT |
2712 | { |
2713 | (*p)->create_postprocessing_buffer(); | |
2714 | this->any_postprocessing_sections_ = true; | |
2715 | } | |
96803768 | 2716 | |
9a0910c3 ILT |
2717 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2718 | && (*p)->after_input_sections()) | |
2719 | continue; | |
17a1d0a9 | 2720 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
2721 | && (!(*p)->after_input_sections() |
2722 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
2723 | continue; | |
17a1d0a9 | 2724 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
2725 | && (!(*p)->after_input_sections() |
2726 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
2727 | continue; | |
27bc2bce | 2728 | |
ead1e424 | 2729 | off = align_address(off, (*p)->addralign()); |
27bc2bce ILT |
2730 | (*p)->set_file_offset(off); |
2731 | (*p)->finalize_data_size(); | |
75f65a3e | 2732 | off += (*p)->data_size(); |
96803768 ILT |
2733 | |
2734 | // At this point the name must be set. | |
17a1d0a9 | 2735 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
96803768 | 2736 | this->namepool_.add((*p)->name(), false, NULL); |
75f65a3e ILT |
2737 | } |
2738 | return off; | |
2739 | } | |
2740 | ||
86887060 ILT |
2741 | // Set the section indexes of all the sections not associated with a |
2742 | // segment. | |
2743 | ||
2744 | unsigned int | |
2745 | Layout::set_section_indexes(unsigned int shndx) | |
2746 | { | |
2747 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
2748 | p != this->unattached_section_list_.end(); | |
2749 | ++p) | |
2750 | { | |
d491d34e ILT |
2751 | if (!(*p)->has_out_shndx()) |
2752 | { | |
2753 | (*p)->set_out_shndx(shndx); | |
2754 | ++shndx; | |
2755 | } | |
86887060 ILT |
2756 | } |
2757 | return shndx; | |
2758 | } | |
2759 | ||
a445fddf ILT |
2760 | // Set the section addresses according to the linker script. This is |
2761 | // only called when we see a SECTIONS clause. This returns the | |
2762 | // program segment which should hold the file header and segment | |
2763 | // headers, if any. It will return NULL if they should not be in a | |
2764 | // segment. | |
2765 | ||
2766 | Output_segment* | |
2767 | Layout::set_section_addresses_from_script(Symbol_table* symtab) | |
20e6d0d6 DK |
2768 | { |
2769 | Script_sections* ss = this->script_options_->script_sections(); | |
2770 | gold_assert(ss->saw_sections_clause()); | |
2771 | return this->script_options_->set_section_addresses(symtab, this); | |
2772 | } | |
2773 | ||
2774 | // Place the orphan sections in the linker script. | |
2775 | ||
2776 | void | |
2777 | Layout::place_orphan_sections_in_script() | |
a445fddf ILT |
2778 | { |
2779 | Script_sections* ss = this->script_options_->script_sections(); | |
2780 | gold_assert(ss->saw_sections_clause()); | |
2781 | ||
2782 | // Place each orphaned output section in the script. | |
2783 | for (Section_list::iterator p = this->section_list_.begin(); | |
2784 | p != this->section_list_.end(); | |
2785 | ++p) | |
2786 | { | |
2787 | if (!(*p)->found_in_sections_clause()) | |
2788 | ss->place_orphan(*p); | |
2789 | } | |
a445fddf ILT |
2790 | } |
2791 | ||
7bf1f802 ILT |
2792 | // Count the local symbols in the regular symbol table and the dynamic |
2793 | // symbol table, and build the respective string pools. | |
2794 | ||
2795 | void | |
17a1d0a9 ILT |
2796 | Layout::count_local_symbols(const Task* task, |
2797 | const Input_objects* input_objects) | |
7bf1f802 | 2798 | { |
6d013333 ILT |
2799 | // First, figure out an upper bound on the number of symbols we'll |
2800 | // be inserting into each pool. This helps us create the pools with | |
2801 | // the right size, to avoid unnecessary hashtable resizing. | |
2802 | unsigned int symbol_count = 0; | |
2803 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2804 | p != input_objects->relobj_end(); | |
2805 | ++p) | |
2806 | symbol_count += (*p)->local_symbol_count(); | |
2807 | ||
2808 | // Go from "upper bound" to "estimate." We overcount for two | |
2809 | // reasons: we double-count symbols that occur in more than one | |
2810 | // object file, and we count symbols that are dropped from the | |
2811 | // output. Add it all together and assume we overcount by 100%. | |
2812 | symbol_count /= 2; | |
2813 | ||
2814 | // We assume all symbols will go into both the sympool and dynpool. | |
2815 | this->sympool_.reserve(symbol_count); | |
2816 | this->dynpool_.reserve(symbol_count); | |
2817 | ||
7bf1f802 ILT |
2818 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2819 | p != input_objects->relobj_end(); | |
2820 | ++p) | |
2821 | { | |
17a1d0a9 | 2822 | Task_lock_obj<Object> tlo(task, *p); |
7bf1f802 ILT |
2823 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
2824 | } | |
2825 | } | |
2826 | ||
b8e6aad9 ILT |
2827 | // Create the symbol table sections. Here we also set the final |
2828 | // values of the symbols. At this point all the loadable sections are | |
d491d34e | 2829 | // fully laid out. SHNUM is the number of sections so far. |
75f65a3e ILT |
2830 | |
2831 | void | |
9025d29d | 2832 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 2833 | Symbol_table* symtab, |
d491d34e | 2834 | unsigned int shnum, |
16649710 | 2835 | off_t* poff) |
75f65a3e | 2836 | { |
61ba1cf9 ILT |
2837 | int symsize; |
2838 | unsigned int align; | |
8851ecca | 2839 | if (parameters->target().get_size() == 32) |
61ba1cf9 ILT |
2840 | { |
2841 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
2842 | align = 4; | |
2843 | } | |
8851ecca | 2844 | else if (parameters->target().get_size() == 64) |
61ba1cf9 ILT |
2845 | { |
2846 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
2847 | align = 8; | |
2848 | } | |
2849 | else | |
a3ad94ed | 2850 | gold_unreachable(); |
61ba1cf9 ILT |
2851 | |
2852 | off_t off = *poff; | |
ead1e424 | 2853 | off = align_address(off, align); |
61ba1cf9 ILT |
2854 | off_t startoff = off; |
2855 | ||
2856 | // Save space for the dummy symbol at the start of the section. We | |
2857 | // never bother to write this out--it will just be left as zero. | |
2858 | off += symsize; | |
c06b7b0b | 2859 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 2860 | |
a3ad94ed ILT |
2861 | // Add STT_SECTION symbols for each Output section which needs one. |
2862 | for (Section_list::iterator p = this->section_list_.begin(); | |
2863 | p != this->section_list_.end(); | |
2864 | ++p) | |
2865 | { | |
2866 | if (!(*p)->needs_symtab_index()) | |
2867 | (*p)->set_symtab_index(-1U); | |
2868 | else | |
2869 | { | |
2870 | (*p)->set_symtab_index(local_symbol_index); | |
2871 | ++local_symbol_index; | |
2872 | off += symsize; | |
2873 | } | |
2874 | } | |
2875 | ||
f6ce93d6 ILT |
2876 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2877 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
2878 | ++p) |
2879 | { | |
c06b7b0b | 2880 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
ef15dade | 2881 | off, symtab); |
c06b7b0b ILT |
2882 | off += (index - local_symbol_index) * symsize; |
2883 | local_symbol_index = index; | |
75f65a3e ILT |
2884 | } |
2885 | ||
c06b7b0b | 2886 | unsigned int local_symcount = local_symbol_index; |
75aea3d0 | 2887 | gold_assert(static_cast<off_t>(local_symcount * symsize) == off - startoff); |
61ba1cf9 | 2888 | |
16649710 ILT |
2889 | off_t dynoff; |
2890 | size_t dyn_global_index; | |
2891 | size_t dyncount; | |
2892 | if (this->dynsym_section_ == NULL) | |
2893 | { | |
2894 | dynoff = 0; | |
2895 | dyn_global_index = 0; | |
2896 | dyncount = 0; | |
2897 | } | |
2898 | else | |
2899 | { | |
2900 | dyn_global_index = this->dynsym_section_->info(); | |
2901 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); | |
2902 | dynoff = this->dynsym_section_->offset() + locsize; | |
2903 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 2904 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
2905 | == this->dynsym_section_->data_size() - locsize); |
2906 | } | |
2907 | ||
55a93433 ILT |
2908 | off = symtab->finalize(off, dynoff, dyn_global_index, dyncount, |
2909 | &this->sympool_, &local_symcount); | |
75f65a3e | 2910 | |
8851ecca | 2911 | if (!parameters->options().strip_all()) |
9e2dcb77 ILT |
2912 | { |
2913 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 2914 | |
cfd73a4e | 2915 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
2916 | Output_section* osymtab = this->make_output_section(symtab_name, |
2917 | elfcpp::SHT_SYMTAB, | |
22f0da72 ILT |
2918 | 0, ORDER_INVALID, |
2919 | false); | |
9e2dcb77 | 2920 | this->symtab_section_ = osymtab; |
a3ad94ed | 2921 | |
27bc2bce | 2922 | Output_section_data* pos = new Output_data_fixed_space(off - startoff, |
7d9e3d98 ILT |
2923 | align, |
2924 | "** symtab"); | |
9e2dcb77 | 2925 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 2926 | |
d491d34e ILT |
2927 | // We generate a .symtab_shndx section if we have more than |
2928 | // SHN_LORESERVE sections. Technically it is possible that we | |
2929 | // don't need one, because it is possible that there are no | |
2930 | // symbols in any of sections with indexes larger than | |
2931 | // SHN_LORESERVE. That is probably unusual, though, and it is | |
2932 | // easier to always create one than to compute section indexes | |
2933 | // twice (once here, once when writing out the symbols). | |
2934 | if (shnum >= elfcpp::SHN_LORESERVE) | |
2935 | { | |
2936 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", | |
2937 | false, NULL); | |
2938 | Output_section* osymtab_xindex = | |
2939 | this->make_output_section(symtab_xindex_name, | |
22f0da72 ILT |
2940 | elfcpp::SHT_SYMTAB_SHNDX, 0, |
2941 | ORDER_INVALID, false); | |
d491d34e ILT |
2942 | |
2943 | size_t symcount = (off - startoff) / symsize; | |
2944 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); | |
2945 | ||
2946 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); | |
2947 | ||
2948 | osymtab_xindex->set_link_section(osymtab); | |
2949 | osymtab_xindex->set_addralign(4); | |
2950 | osymtab_xindex->set_entsize(4); | |
2951 | ||
2952 | osymtab_xindex->set_after_input_sections(); | |
2953 | ||
2954 | // This tells the driver code to wait until the symbol table | |
2955 | // has written out before writing out the postprocessing | |
2956 | // sections, including the .symtab_shndx section. | |
2957 | this->any_postprocessing_sections_ = true; | |
2958 | } | |
2959 | ||
cfd73a4e | 2960 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
2961 | Output_section* ostrtab = this->make_output_section(strtab_name, |
2962 | elfcpp::SHT_STRTAB, | |
22f0da72 ILT |
2963 | 0, ORDER_INVALID, |
2964 | false); | |
a3ad94ed | 2965 | |
9e2dcb77 ILT |
2966 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
2967 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 2968 | |
27bc2bce ILT |
2969 | osymtab->set_file_offset(startoff); |
2970 | osymtab->finalize_data_size(); | |
9e2dcb77 ILT |
2971 | osymtab->set_link_section(ostrtab); |
2972 | osymtab->set_info(local_symcount); | |
2973 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 2974 | |
9e2dcb77 ILT |
2975 | *poff = off; |
2976 | } | |
75f65a3e ILT |
2977 | } |
2978 | ||
2979 | // Create the .shstrtab section, which holds the names of the | |
2980 | // sections. At the time this is called, we have created all the | |
2981 | // output sections except .shstrtab itself. | |
2982 | ||
2983 | Output_section* | |
2984 | Layout::create_shstrtab() | |
2985 | { | |
2986 | // FIXME: We don't need to create a .shstrtab section if we are | |
2987 | // stripping everything. | |
2988 | ||
cfd73a4e | 2989 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 2990 | |
f5c870d2 | 2991 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0, |
22f0da72 | 2992 | ORDER_INVALID, false); |
75f65a3e | 2993 | |
0e0d5469 ILT |
2994 | if (strcmp(parameters->options().compress_debug_sections(), "none") != 0) |
2995 | { | |
2996 | // We can't write out this section until we've set all the | |
2997 | // section names, and we don't set the names of compressed | |
2998 | // output sections until relocations are complete. FIXME: With | |
2999 | // the current names we use, this is unnecessary. | |
3000 | os->set_after_input_sections(); | |
3001 | } | |
27bc2bce | 3002 | |
a3ad94ed ILT |
3003 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
3004 | os->add_output_section_data(posd); | |
75f65a3e ILT |
3005 | |
3006 | return os; | |
3007 | } | |
3008 | ||
3009 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
3010 | // offset. | |
3011 | ||
27bc2bce | 3012 | void |
d491d34e | 3013 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
75f65a3e ILT |
3014 | { |
3015 | Output_section_headers* oshdrs; | |
9025d29d | 3016 | oshdrs = new Output_section_headers(this, |
16649710 | 3017 | &this->segment_list_, |
6a74a719 | 3018 | &this->section_list_, |
16649710 | 3019 | &this->unattached_section_list_, |
d491d34e ILT |
3020 | &this->namepool_, |
3021 | shstrtab_section); | |
ead1e424 | 3022 | off_t off = align_address(*poff, oshdrs->addralign()); |
27bc2bce | 3023 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 ILT |
3024 | off += oshdrs->data_size(); |
3025 | *poff = off; | |
27bc2bce | 3026 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
3027 | } |
3028 | ||
d491d34e ILT |
3029 | // Count the allocated sections. |
3030 | ||
3031 | size_t | |
3032 | Layout::allocated_output_section_count() const | |
3033 | { | |
3034 | size_t section_count = 0; | |
3035 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3036 | p != this->segment_list_.end(); | |
3037 | ++p) | |
3038 | section_count += (*p)->output_section_count(); | |
3039 | return section_count; | |
3040 | } | |
3041 | ||
dbe717ef ILT |
3042 | // Create the dynamic symbol table. |
3043 | ||
3044 | void | |
7bf1f802 | 3045 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
9b07f471 | 3046 | Symbol_table* symtab, |
14b31740 ILT |
3047 | Output_section **pdynstr, |
3048 | unsigned int* plocal_dynamic_count, | |
3049 | std::vector<Symbol*>* pdynamic_symbols, | |
3050 | Versions* pversions) | |
dbe717ef | 3051 | { |
a3ad94ed ILT |
3052 | // Count all the symbols in the dynamic symbol table, and set the |
3053 | // dynamic symbol indexes. | |
dbe717ef | 3054 | |
a3ad94ed ILT |
3055 | // Skip symbol 0, which is always all zeroes. |
3056 | unsigned int index = 1; | |
dbe717ef | 3057 | |
a3ad94ed ILT |
3058 | // Add STT_SECTION symbols for each Output section which needs one. |
3059 | for (Section_list::iterator p = this->section_list_.begin(); | |
3060 | p != this->section_list_.end(); | |
3061 | ++p) | |
3062 | { | |
3063 | if (!(*p)->needs_dynsym_index()) | |
3064 | (*p)->set_dynsym_index(-1U); | |
3065 | else | |
3066 | { | |
3067 | (*p)->set_dynsym_index(index); | |
3068 | ++index; | |
3069 | } | |
3070 | } | |
3071 | ||
7bf1f802 ILT |
3072 | // Count the local symbols that need to go in the dynamic symbol table, |
3073 | // and set the dynamic symbol indexes. | |
3074 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
3075 | p != input_objects->relobj_end(); | |
3076 | ++p) | |
3077 | { | |
3078 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
3079 | index = new_index; | |
3080 | } | |
a3ad94ed ILT |
3081 | |
3082 | unsigned int local_symcount = index; | |
14b31740 | 3083 | *plocal_dynamic_count = local_symcount; |
a3ad94ed | 3084 | |
9b07f471 | 3085 | index = symtab->set_dynsym_indexes(index, pdynamic_symbols, |
35cdfc9a | 3086 | &this->dynpool_, pversions); |
a3ad94ed ILT |
3087 | |
3088 | int symsize; | |
3089 | unsigned int align; | |
8851ecca | 3090 | const int size = parameters->target().get_size(); |
a3ad94ed ILT |
3091 | if (size == 32) |
3092 | { | |
3093 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
3094 | align = 4; | |
3095 | } | |
3096 | else if (size == 64) | |
3097 | { | |
3098 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
3099 | align = 8; | |
3100 | } | |
3101 | else | |
3102 | gold_unreachable(); | |
3103 | ||
14b31740 ILT |
3104 | // Create the dynamic symbol table section. |
3105 | ||
3802b2dd ILT |
3106 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
3107 | elfcpp::SHT_DYNSYM, | |
3108 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
3109 | false, |
3110 | ORDER_DYNAMIC_LINKER, | |
3111 | false); | |
a3ad94ed | 3112 | |
27bc2bce | 3113 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, |
7d9e3d98 ILT |
3114 | align, |
3115 | "** dynsym"); | |
a3ad94ed ILT |
3116 | dynsym->add_output_section_data(odata); |
3117 | ||
3118 | dynsym->set_info(local_symcount); | |
3119 | dynsym->set_entsize(symsize); | |
3120 | dynsym->set_addralign(align); | |
3121 | ||
3122 | this->dynsym_section_ = dynsym; | |
3123 | ||
16649710 | 3124 | Output_data_dynamic* const odyn = this->dynamic_data_; |
a3ad94ed ILT |
3125 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); |
3126 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
3127 | ||
d491d34e ILT |
3128 | // If there are more than SHN_LORESERVE allocated sections, we |
3129 | // create a .dynsym_shndx section. It is possible that we don't | |
3130 | // need one, because it is possible that there are no dynamic | |
3131 | // symbols in any of the sections with indexes larger than | |
3132 | // SHN_LORESERVE. This is probably unusual, though, and at this | |
3133 | // time we don't know the actual section indexes so it is | |
3134 | // inconvenient to check. | |
3135 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) | |
3136 | { | |
2ea97941 | 3137 | Output_section* dynsym_xindex = |
d491d34e ILT |
3138 | this->choose_output_section(NULL, ".dynsym_shndx", |
3139 | elfcpp::SHT_SYMTAB_SHNDX, | |
3140 | elfcpp::SHF_ALLOC, | |
22f0da72 | 3141 | false, ORDER_DYNAMIC_LINKER, false); |
d491d34e ILT |
3142 | |
3143 | this->dynsym_xindex_ = new Output_symtab_xindex(index); | |
3144 | ||
2ea97941 | 3145 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); |
d491d34e | 3146 | |
2ea97941 ILT |
3147 | dynsym_xindex->set_link_section(dynsym); |
3148 | dynsym_xindex->set_addralign(4); | |
3149 | dynsym_xindex->set_entsize(4); | |
d491d34e | 3150 | |
2ea97941 | 3151 | dynsym_xindex->set_after_input_sections(); |
d491d34e ILT |
3152 | |
3153 | // This tells the driver code to wait until the symbol table has | |
3154 | // written out before writing out the postprocessing sections, | |
3155 | // including the .dynsym_shndx section. | |
3156 | this->any_postprocessing_sections_ = true; | |
3157 | } | |
3158 | ||
14b31740 ILT |
3159 | // Create the dynamic string table section. |
3160 | ||
3802b2dd ILT |
3161 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
3162 | elfcpp::SHT_STRTAB, | |
3163 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
3164 | false, |
3165 | ORDER_DYNAMIC_LINKER, | |
3166 | false); | |
a3ad94ed ILT |
3167 | |
3168 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
3169 | dynstr->add_output_section_data(strdata); | |
3170 | ||
16649710 ILT |
3171 | dynsym->set_link_section(dynstr); |
3172 | this->dynamic_section_->set_link_section(dynstr); | |
3173 | ||
a3ad94ed ILT |
3174 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); |
3175 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
3176 | ||
14b31740 ILT |
3177 | *pdynstr = dynstr; |
3178 | ||
3179 | // Create the hash tables. | |
3180 | ||
13670ee6 ILT |
3181 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
3182 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
3183 | { | |
3184 | unsigned char* phash; | |
3185 | unsigned int hashlen; | |
3186 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, | |
3187 | &phash, &hashlen); | |
3188 | ||
22f0da72 ILT |
3189 | Output_section* hashsec = |
3190 | this->choose_output_section(NULL, ".hash", elfcpp::SHT_HASH, | |
3191 | elfcpp::SHF_ALLOC, false, | |
3192 | ORDER_DYNAMIC_LINKER, false); | |
13670ee6 ILT |
3193 | |
3194 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
3195 | hashlen, | |
7d9e3d98 ILT |
3196 | align, |
3197 | "** hash"); | |
13670ee6 ILT |
3198 | hashsec->add_output_section_data(hashdata); |
3199 | ||
3200 | hashsec->set_link_section(dynsym); | |
3201 | hashsec->set_entsize(4); | |
a3ad94ed | 3202 | |
13670ee6 ILT |
3203 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); |
3204 | } | |
3205 | ||
3206 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 | |
3207 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
3208 | { | |
3209 | unsigned char* phash; | |
3210 | unsigned int hashlen; | |
3211 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, local_symcount, | |
3212 | &phash, &hashlen); | |
a3ad94ed | 3213 | |
22f0da72 ILT |
3214 | Output_section* hashsec = |
3215 | this->choose_output_section(NULL, ".gnu.hash", elfcpp::SHT_GNU_HASH, | |
3216 | elfcpp::SHF_ALLOC, false, | |
3217 | ORDER_DYNAMIC_LINKER, false); | |
a3ad94ed | 3218 | |
13670ee6 ILT |
3219 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
3220 | hashlen, | |
7d9e3d98 ILT |
3221 | align, |
3222 | "** hash"); | |
13670ee6 | 3223 | hashsec->add_output_section_data(hashdata); |
a3ad94ed | 3224 | |
13670ee6 | 3225 | hashsec->set_link_section(dynsym); |
1b81fb71 ILT |
3226 | |
3227 | // For a 64-bit target, the entries in .gnu.hash do not have a | |
3228 | // uniform size, so we only set the entry size for a 32-bit | |
3229 | // target. | |
3230 | if (parameters->target().get_size() == 32) | |
3231 | hashsec->set_entsize(4); | |
a3ad94ed | 3232 | |
13670ee6 ILT |
3233 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); |
3234 | } | |
dbe717ef ILT |
3235 | } |
3236 | ||
7bf1f802 ILT |
3237 | // Assign offsets to each local portion of the dynamic symbol table. |
3238 | ||
3239 | void | |
3240 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
3241 | { | |
3242 | Output_section* dynsym = this->dynsym_section_; | |
3243 | gold_assert(dynsym != NULL); | |
3244 | ||
3245 | off_t off = dynsym->offset(); | |
3246 | ||
3247 | // Skip the dummy symbol at the start of the section. | |
3248 | off += dynsym->entsize(); | |
3249 | ||
3250 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
3251 | p != input_objects->relobj_end(); | |
3252 | ++p) | |
3253 | { | |
3254 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
3255 | off += count * dynsym->entsize(); | |
3256 | } | |
3257 | } | |
3258 | ||
14b31740 ILT |
3259 | // Create the version sections. |
3260 | ||
3261 | void | |
9025d29d | 3262 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 3263 | const Symbol_table* symtab, |
14b31740 ILT |
3264 | unsigned int local_symcount, |
3265 | const std::vector<Symbol*>& dynamic_symbols, | |
3266 | const Output_section* dynstr) | |
3267 | { | |
3268 | if (!versions->any_defs() && !versions->any_needs()) | |
3269 | return; | |
3270 | ||
8851ecca | 3271 | switch (parameters->size_and_endianness()) |
14b31740 | 3272 | { |
193a53d9 | 3273 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 3274 | case Parameters::TARGET_32_LITTLE: |
7d1a9ebb ILT |
3275 | this->sized_create_version_sections<32, false>(versions, symtab, |
3276 | local_symcount, | |
3277 | dynamic_symbols, dynstr); | |
8851ecca | 3278 | break; |
193a53d9 | 3279 | #endif |
8851ecca ILT |
3280 | #ifdef HAVE_TARGET_32_BIG |
3281 | case Parameters::TARGET_32_BIG: | |
7d1a9ebb ILT |
3282 | this->sized_create_version_sections<32, true>(versions, symtab, |
3283 | local_symcount, | |
3284 | dynamic_symbols, dynstr); | |
8851ecca | 3285 | break; |
193a53d9 | 3286 | #endif |
193a53d9 | 3287 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 3288 | case Parameters::TARGET_64_LITTLE: |
7d1a9ebb ILT |
3289 | this->sized_create_version_sections<64, false>(versions, symtab, |
3290 | local_symcount, | |
3291 | dynamic_symbols, dynstr); | |
8851ecca | 3292 | break; |
193a53d9 | 3293 | #endif |
8851ecca ILT |
3294 | #ifdef HAVE_TARGET_64_BIG |
3295 | case Parameters::TARGET_64_BIG: | |
7d1a9ebb ILT |
3296 | this->sized_create_version_sections<64, true>(versions, symtab, |
3297 | local_symcount, | |
3298 | dynamic_symbols, dynstr); | |
8851ecca ILT |
3299 | break; |
3300 | #endif | |
3301 | default: | |
3302 | gold_unreachable(); | |
14b31740 | 3303 | } |
14b31740 ILT |
3304 | } |
3305 | ||
3306 | // Create the version sections, sized version. | |
3307 | ||
3308 | template<int size, bool big_endian> | |
3309 | void | |
3310 | Layout::sized_create_version_sections( | |
3311 | const Versions* versions, | |
46fe1623 | 3312 | const Symbol_table* symtab, |
14b31740 ILT |
3313 | unsigned int local_symcount, |
3314 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 3315 | const Output_section* dynstr) |
14b31740 | 3316 | { |
3802b2dd ILT |
3317 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
3318 | elfcpp::SHT_GNU_versym, | |
3319 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
3320 | false, |
3321 | ORDER_DYNAMIC_LINKER, | |
3322 | false); | |
14b31740 ILT |
3323 | |
3324 | unsigned char* vbuf; | |
3325 | unsigned int vsize; | |
7d1a9ebb ILT |
3326 | versions->symbol_section_contents<size, big_endian>(symtab, &this->dynpool_, |
3327 | local_symcount, | |
3328 | dynamic_symbols, | |
3329 | &vbuf, &vsize); | |
14b31740 | 3330 | |
7d9e3d98 ILT |
3331 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, |
3332 | "** versions"); | |
14b31740 ILT |
3333 | |
3334 | vsec->add_output_section_data(vdata); | |
3335 | vsec->set_entsize(2); | |
3336 | vsec->set_link_section(this->dynsym_section_); | |
3337 | ||
3338 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
3339 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
3340 | ||
3341 | if (versions->any_defs()) | |
3342 | { | |
3802b2dd ILT |
3343 | Output_section* vdsec; |
3344 | vdsec= this->choose_output_section(NULL, ".gnu.version_d", | |
3345 | elfcpp::SHT_GNU_verdef, | |
3346 | elfcpp::SHF_ALLOC, | |
22f0da72 | 3347 | false, ORDER_DYNAMIC_LINKER, false); |
14b31740 ILT |
3348 | |
3349 | unsigned char* vdbuf; | |
3350 | unsigned int vdsize; | |
3351 | unsigned int vdentries; | |
7d1a9ebb ILT |
3352 | versions->def_section_contents<size, big_endian>(&this->dynpool_, &vdbuf, |
3353 | &vdsize, &vdentries); | |
14b31740 | 3354 | |
7d9e3d98 ILT |
3355 | Output_section_data* vddata = |
3356 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); | |
14b31740 ILT |
3357 | |
3358 | vdsec->add_output_section_data(vddata); | |
3359 | vdsec->set_link_section(dynstr); | |
3360 | vdsec->set_info(vdentries); | |
3361 | ||
3362 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
3363 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
3364 | } | |
3365 | ||
3366 | if (versions->any_needs()) | |
3367 | { | |
14b31740 | 3368 | Output_section* vnsec; |
3802b2dd ILT |
3369 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
3370 | elfcpp::SHT_GNU_verneed, | |
3371 | elfcpp::SHF_ALLOC, | |
22f0da72 | 3372 | false, ORDER_DYNAMIC_LINKER, false); |
14b31740 ILT |
3373 | |
3374 | unsigned char* vnbuf; | |
3375 | unsigned int vnsize; | |
3376 | unsigned int vnentries; | |
7d1a9ebb ILT |
3377 | versions->need_section_contents<size, big_endian>(&this->dynpool_, |
3378 | &vnbuf, &vnsize, | |
3379 | &vnentries); | |
14b31740 | 3380 | |
7d9e3d98 ILT |
3381 | Output_section_data* vndata = |
3382 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); | |
14b31740 ILT |
3383 | |
3384 | vnsec->add_output_section_data(vndata); | |
3385 | vnsec->set_link_section(dynstr); | |
3386 | vnsec->set_info(vnentries); | |
3387 | ||
3388 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
3389 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
3390 | } | |
3391 | } | |
3392 | ||
dbe717ef ILT |
3393 | // Create the .interp section and PT_INTERP segment. |
3394 | ||
3395 | void | |
3396 | Layout::create_interp(const Target* target) | |
3397 | { | |
e55bde5e | 3398 | const char* interp = parameters->options().dynamic_linker(); |
dbe717ef ILT |
3399 | if (interp == NULL) |
3400 | { | |
3401 | interp = target->dynamic_linker(); | |
a3ad94ed | 3402 | gold_assert(interp != NULL); |
dbe717ef ILT |
3403 | } |
3404 | ||
3405 | size_t len = strlen(interp) + 1; | |
3406 | ||
3407 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
3408 | ||
3802b2dd ILT |
3409 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
3410 | elfcpp::SHT_PROGBITS, | |
3411 | elfcpp::SHF_ALLOC, | |
22f0da72 ILT |
3412 | false, ORDER_INTERP, |
3413 | false); | |
dbe717ef ILT |
3414 | osec->add_output_section_data(odata); |
3415 | ||
1c4f3631 ILT |
3416 | if (!this->script_options_->saw_phdrs_clause()) |
3417 | { | |
3418 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_INTERP, | |
3419 | elfcpp::PF_R); | |
22f0da72 | 3420 | oseg->add_output_section_to_nonload(osec, elfcpp::PF_R); |
1c4f3631 | 3421 | } |
dbe717ef ILT |
3422 | } |
3423 | ||
ea715a34 ILT |
3424 | // Add dynamic tags for the PLT and the dynamic relocs. This is |
3425 | // called by the target-specific code. This does nothing if not doing | |
3426 | // a dynamic link. | |
3427 | ||
3428 | // USE_REL is true for REL relocs rather than RELA relocs. | |
3429 | ||
3430 | // If PLT_GOT is not NULL, then DT_PLTGOT points to it. | |
3431 | ||
3432 | // If PLT_REL is not NULL, it is used for DT_PLTRELSZ, and DT_JMPREL, | |
e291e7b9 ILT |
3433 | // and we also set DT_PLTREL. We use PLT_REL's output section, since |
3434 | // some targets have multiple reloc sections in PLT_REL. | |
ea715a34 ILT |
3435 | |
3436 | // If DYN_REL is not NULL, it is used for DT_REL/DT_RELA, | |
3437 | // DT_RELSZ/DT_RELASZ, DT_RELENT/DT_RELAENT. | |
3438 | ||
3439 | // If ADD_DEBUG is true, we add a DT_DEBUG entry when generating an | |
3440 | // executable. | |
3441 | ||
3442 | void | |
3443 | Layout::add_target_dynamic_tags(bool use_rel, const Output_data* plt_got, | |
3444 | const Output_data* plt_rel, | |
3a44184e | 3445 | const Output_data_reloc_generic* dyn_rel, |
612a8d3d | 3446 | bool add_debug, bool dynrel_includes_plt) |
ea715a34 ILT |
3447 | { |
3448 | Output_data_dynamic* odyn = this->dynamic_data_; | |
3449 | if (odyn == NULL) | |
3450 | return; | |
3451 | ||
3452 | if (plt_got != NULL && plt_got->output_section() != NULL) | |
3453 | odyn->add_section_address(elfcpp::DT_PLTGOT, plt_got); | |
3454 | ||
3455 | if (plt_rel != NULL && plt_rel->output_section() != NULL) | |
3456 | { | |
e291e7b9 ILT |
3457 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, plt_rel->output_section()); |
3458 | odyn->add_section_address(elfcpp::DT_JMPREL, plt_rel->output_section()); | |
ea715a34 ILT |
3459 | odyn->add_constant(elfcpp::DT_PLTREL, |
3460 | use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA); | |
3461 | } | |
3462 | ||
3463 | if (dyn_rel != NULL && dyn_rel->output_section() != NULL) | |
3464 | { | |
3465 | odyn->add_section_address(use_rel ? elfcpp::DT_REL : elfcpp::DT_RELA, | |
3466 | dyn_rel); | |
612a8d3d DM |
3467 | if (plt_rel != NULL && dynrel_includes_plt) |
3468 | odyn->add_section_size(use_rel ? elfcpp::DT_RELSZ : elfcpp::DT_RELASZ, | |
3469 | dyn_rel, plt_rel); | |
3470 | else | |
3471 | odyn->add_section_size(use_rel ? elfcpp::DT_RELSZ : elfcpp::DT_RELASZ, | |
3472 | dyn_rel); | |
ea715a34 ILT |
3473 | const int size = parameters->target().get_size(); |
3474 | elfcpp::DT rel_tag; | |
3475 | int rel_size; | |
3476 | if (use_rel) | |
3477 | { | |
3478 | rel_tag = elfcpp::DT_RELENT; | |
3479 | if (size == 32) | |
3480 | rel_size = Reloc_types<elfcpp::SHT_REL, 32, false>::reloc_size; | |
3481 | else if (size == 64) | |
3482 | rel_size = Reloc_types<elfcpp::SHT_REL, 64, false>::reloc_size; | |
3483 | else | |
3484 | gold_unreachable(); | |
3485 | } | |
3486 | else | |
3487 | { | |
3488 | rel_tag = elfcpp::DT_RELAENT; | |
3489 | if (size == 32) | |
3490 | rel_size = Reloc_types<elfcpp::SHT_RELA, 32, false>::reloc_size; | |
3491 | else if (size == 64) | |
3492 | rel_size = Reloc_types<elfcpp::SHT_RELA, 64, false>::reloc_size; | |
3493 | else | |
3494 | gold_unreachable(); | |
3495 | } | |
3496 | odyn->add_constant(rel_tag, rel_size); | |
3a44184e ILT |
3497 | |
3498 | if (parameters->options().combreloc()) | |
3499 | { | |
3500 | size_t c = dyn_rel->relative_reloc_count(); | |
3501 | if (c > 0) | |
3502 | odyn->add_constant((use_rel | |
3503 | ? elfcpp::DT_RELCOUNT | |
3504 | : elfcpp::DT_RELACOUNT), | |
3505 | c); | |
3506 | } | |
ea715a34 ILT |
3507 | } |
3508 | ||
3509 | if (add_debug && !parameters->options().shared()) | |
3510 | { | |
3511 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
3512 | // linker at run time, and used by the debugger. | |
3513 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
3514 | } | |
3515 | } | |
3516 | ||
a3ad94ed ILT |
3517 | // Finish the .dynamic section and PT_DYNAMIC segment. |
3518 | ||
3519 | void | |
3520 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 3521 | const Symbol_table* symtab) |
a3ad94ed | 3522 | { |
1c4f3631 ILT |
3523 | if (!this->script_options_->saw_phdrs_clause()) |
3524 | { | |
3525 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, | |
3526 | (elfcpp::PF_R | |
3527 | | elfcpp::PF_W)); | |
22f0da72 ILT |
3528 | oseg->add_output_section_to_nonload(this->dynamic_section_, |
3529 | elfcpp::PF_R | elfcpp::PF_W); | |
1c4f3631 | 3530 | } |
a3ad94ed | 3531 | |
16649710 ILT |
3532 | Output_data_dynamic* const odyn = this->dynamic_data_; |
3533 | ||
a3ad94ed ILT |
3534 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
3535 | p != input_objects->dynobj_end(); | |
3536 | ++p) | |
3537 | { | |
594c8e5e ILT |
3538 | if (!(*p)->is_needed() |
3539 | && (*p)->input_file()->options().as_needed()) | |
3540 | { | |
3541 | // This dynamic object was linked with --as-needed, but it | |
3542 | // is not needed. | |
3543 | continue; | |
3544 | } | |
3545 | ||
a3ad94ed ILT |
3546 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); |
3547 | } | |
3548 | ||
8851ecca | 3549 | if (parameters->options().shared()) |
fced7afd | 3550 | { |
e55bde5e | 3551 | const char* soname = parameters->options().soname(); |
fced7afd ILT |
3552 | if (soname != NULL) |
3553 | odyn->add_string(elfcpp::DT_SONAME, soname); | |
3554 | } | |
3555 | ||
c6585162 | 3556 | Symbol* sym = symtab->lookup(parameters->options().init()); |
14b31740 | 3557 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
3558 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
3559 | ||
c6585162 | 3560 | sym = symtab->lookup(parameters->options().fini()); |
14b31740 | 3561 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
3562 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
3563 | ||
f15f61a7 DK |
3564 | // Look for .init_array, .preinit_array and .fini_array by checking |
3565 | // section types. | |
3566 | for(Layout::Section_list::const_iterator p = this->section_list_.begin(); | |
3567 | p != this->section_list_.end(); | |
3568 | ++p) | |
3569 | switch((*p)->type()) | |
3570 | { | |
3571 | case elfcpp::SHT_FINI_ARRAY: | |
3572 | odyn->add_section_address(elfcpp::DT_FINI_ARRAY, *p); | |
3573 | odyn->add_section_size(elfcpp::DT_FINI_ARRAYSZ, *p); | |
3574 | break; | |
3575 | case elfcpp::SHT_INIT_ARRAY: | |
3576 | odyn->add_section_address(elfcpp::DT_INIT_ARRAY, *p); | |
3577 | odyn->add_section_size(elfcpp::DT_INIT_ARRAYSZ, *p); | |
3578 | break; | |
3579 | case elfcpp::SHT_PREINIT_ARRAY: | |
3580 | odyn->add_section_address(elfcpp::DT_PREINIT_ARRAY, *p); | |
3581 | odyn->add_section_size(elfcpp::DT_PREINIT_ARRAYSZ, *p); | |
3582 | break; | |
3583 | default: | |
3584 | break; | |
3585 | } | |
3586 | ||
41f542e7 | 3587 | // Add a DT_RPATH entry if needed. |
e55bde5e | 3588 | const General_options::Dir_list& rpath(parameters->options().rpath()); |
41f542e7 ILT |
3589 | if (!rpath.empty()) |
3590 | { | |
3591 | std::string rpath_val; | |
3592 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
3593 | p != rpath.end(); | |
3594 | ++p) | |
3595 | { | |
3596 | if (rpath_val.empty()) | |
ad2d6943 | 3597 | rpath_val = p->name(); |
41f542e7 ILT |
3598 | else |
3599 | { | |
3600 | // Eliminate duplicates. | |
3601 | General_options::Dir_list::const_iterator q; | |
3602 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 3603 | if (q->name() == p->name()) |
41f542e7 ILT |
3604 | break; |
3605 | if (q == p) | |
3606 | { | |
3607 | rpath_val += ':'; | |
ad2d6943 | 3608 | rpath_val += p->name(); |
41f542e7 ILT |
3609 | } |
3610 | } | |
3611 | } | |
3612 | ||
3613 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
7c414435 DM |
3614 | if (parameters->options().enable_new_dtags()) |
3615 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); | |
41f542e7 | 3616 | } |
4f4c5f80 ILT |
3617 | |
3618 | // Look for text segments that have dynamic relocations. | |
3619 | bool have_textrel = false; | |
4e8fe71f | 3620 | if (!this->script_options_->saw_sections_clause()) |
4f4c5f80 | 3621 | { |
4e8fe71f ILT |
3622 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
3623 | p != this->segment_list_.end(); | |
3624 | ++p) | |
3625 | { | |
3626 | if (((*p)->flags() & elfcpp::PF_W) == 0 | |
22f0da72 | 3627 | && (*p)->has_dynamic_reloc()) |
4e8fe71f ILT |
3628 | { |
3629 | have_textrel = true; | |
3630 | break; | |
3631 | } | |
3632 | } | |
3633 | } | |
3634 | else | |
3635 | { | |
3636 | // We don't know the section -> segment mapping, so we are | |
3637 | // conservative and just look for readonly sections with | |
3638 | // relocations. If those sections wind up in writable segments, | |
3639 | // then we have created an unnecessary DT_TEXTREL entry. | |
3640 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3641 | p != this->section_list_.end(); | |
3642 | ++p) | |
3643 | { | |
3644 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 | |
3645 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 | |
22f0da72 | 3646 | && ((*p)->has_dynamic_reloc())) |
4e8fe71f ILT |
3647 | { |
3648 | have_textrel = true; | |
3649 | break; | |
3650 | } | |
3651 | } | |
4f4c5f80 ILT |
3652 | } |
3653 | ||
3654 | // Add a DT_FLAGS entry. We add it even if no flags are set so that | |
3655 | // post-link tools can easily modify these flags if desired. | |
3656 | unsigned int flags = 0; | |
3657 | if (have_textrel) | |
6a41d30b ILT |
3658 | { |
3659 | // Add a DT_TEXTREL for compatibility with older loaders. | |
3660 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
3661 | flags |= elfcpp::DF_TEXTREL; | |
b9674e17 | 3662 | |
ffeef7df ILT |
3663 | if (parameters->options().text()) |
3664 | gold_error(_("read-only segment has dynamic relocations")); | |
3665 | else if (parameters->options().warn_shared_textrel() | |
3666 | && parameters->options().shared()) | |
b9674e17 | 3667 | gold_warning(_("shared library text segment is not shareable")); |
6a41d30b | 3668 | } |
8851ecca | 3669 | if (parameters->options().shared() && this->has_static_tls()) |
535890bb | 3670 | flags |= elfcpp::DF_STATIC_TLS; |
7be8330a CD |
3671 | if (parameters->options().origin()) |
3672 | flags |= elfcpp::DF_ORIGIN; | |
f15f61a7 DK |
3673 | if (parameters->options().Bsymbolic()) |
3674 | { | |
3675 | flags |= elfcpp::DF_SYMBOLIC; | |
3676 | // Add DT_SYMBOLIC for compatibility with older loaders. | |
3677 | odyn->add_constant(elfcpp::DT_SYMBOLIC, 0); | |
3678 | } | |
e1c74d60 ILT |
3679 | if (parameters->options().now()) |
3680 | flags |= elfcpp::DF_BIND_NOW; | |
4f4c5f80 | 3681 | odyn->add_constant(elfcpp::DT_FLAGS, flags); |
7c414435 DM |
3682 | |
3683 | flags = 0; | |
3684 | if (parameters->options().initfirst()) | |
3685 | flags |= elfcpp::DF_1_INITFIRST; | |
3686 | if (parameters->options().interpose()) | |
3687 | flags |= elfcpp::DF_1_INTERPOSE; | |
3688 | if (parameters->options().loadfltr()) | |
3689 | flags |= elfcpp::DF_1_LOADFLTR; | |
3690 | if (parameters->options().nodefaultlib()) | |
3691 | flags |= elfcpp::DF_1_NODEFLIB; | |
3692 | if (parameters->options().nodelete()) | |
3693 | flags |= elfcpp::DF_1_NODELETE; | |
3694 | if (parameters->options().nodlopen()) | |
3695 | flags |= elfcpp::DF_1_NOOPEN; | |
3696 | if (parameters->options().nodump()) | |
3697 | flags |= elfcpp::DF_1_NODUMP; | |
3698 | if (!parameters->options().shared()) | |
3699 | flags &= ~(elfcpp::DF_1_INITFIRST | |
3700 | | elfcpp::DF_1_NODELETE | |
3701 | | elfcpp::DF_1_NOOPEN); | |
7be8330a CD |
3702 | if (parameters->options().origin()) |
3703 | flags |= elfcpp::DF_1_ORIGIN; | |
e1c74d60 ILT |
3704 | if (parameters->options().now()) |
3705 | flags |= elfcpp::DF_1_NOW; | |
7c414435 DM |
3706 | if (flags) |
3707 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); | |
a3ad94ed ILT |
3708 | } |
3709 | ||
f0ba79e2 ILT |
3710 | // Set the size of the _DYNAMIC symbol table to be the size of the |
3711 | // dynamic data. | |
3712 | ||
3713 | void | |
3714 | Layout::set_dynamic_symbol_size(const Symbol_table* symtab) | |
3715 | { | |
3716 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
3717 | odyn->finalize_data_size(); | |
3718 | off_t data_size = odyn->data_size(); | |
3719 | const int size = parameters->target().get_size(); | |
3720 | if (size == 32) | |
3721 | symtab->get_sized_symbol<32>(this->dynamic_symbol_)->set_symsize(data_size); | |
3722 | else if (size == 64) | |
3723 | symtab->get_sized_symbol<64>(this->dynamic_symbol_)->set_symsize(data_size); | |
3724 | else | |
3725 | gold_unreachable(); | |
3726 | } | |
3727 | ||
dff16297 ILT |
3728 | // The mapping of input section name prefixes to output section names. |
3729 | // In some cases one prefix is itself a prefix of another prefix; in | |
3730 | // such a case the longer prefix must come first. These prefixes are | |
3731 | // based on the GNU linker default ELF linker script. | |
a2fb1b05 | 3732 | |
ead1e424 | 3733 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
dff16297 | 3734 | const Layout::Section_name_mapping Layout::section_name_mapping[] = |
a2fb1b05 | 3735 | { |
dff16297 ILT |
3736 | MAPPING_INIT(".text.", ".text"), |
3737 | MAPPING_INIT(".ctors.", ".ctors"), | |
3738 | MAPPING_INIT(".dtors.", ".dtors"), | |
3739 | MAPPING_INIT(".rodata.", ".rodata"), | |
3740 | MAPPING_INIT(".data.rel.ro.local", ".data.rel.ro.local"), | |
3741 | MAPPING_INIT(".data.rel.ro", ".data.rel.ro"), | |
3742 | MAPPING_INIT(".data.", ".data"), | |
3743 | MAPPING_INIT(".bss.", ".bss"), | |
3744 | MAPPING_INIT(".tdata.", ".tdata"), | |
3745 | MAPPING_INIT(".tbss.", ".tbss"), | |
3746 | MAPPING_INIT(".init_array.", ".init_array"), | |
3747 | MAPPING_INIT(".fini_array.", ".fini_array"), | |
3748 | MAPPING_INIT(".sdata.", ".sdata"), | |
3749 | MAPPING_INIT(".sbss.", ".sbss"), | |
3750 | // FIXME: In the GNU linker, .sbss2 and .sdata2 are handled | |
3751 | // differently depending on whether it is creating a shared library. | |
3752 | MAPPING_INIT(".sdata2.", ".sdata"), | |
3753 | MAPPING_INIT(".sbss2.", ".sbss"), | |
3754 | MAPPING_INIT(".lrodata.", ".lrodata"), | |
3755 | MAPPING_INIT(".ldata.", ".ldata"), | |
3756 | MAPPING_INIT(".lbss.", ".lbss"), | |
3757 | MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"), | |
3758 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"), | |
3759 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"), | |
3760 | MAPPING_INIT(".gnu.linkonce.t.", ".text"), | |
3761 | MAPPING_INIT(".gnu.linkonce.r.", ".rodata"), | |
3762 | MAPPING_INIT(".gnu.linkonce.d.", ".data"), | |
3763 | MAPPING_INIT(".gnu.linkonce.b.", ".bss"), | |
3764 | MAPPING_INIT(".gnu.linkonce.s.", ".sdata"), | |
3765 | MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"), | |
3766 | MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"), | |
3767 | MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"), | |
3768 | MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"), | |
3769 | MAPPING_INIT(".gnu.linkonce.td.", ".tdata"), | |
3770 | MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"), | |
3771 | MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"), | |
3772 | MAPPING_INIT(".gnu.linkonce.l.", ".ldata"), | |
3773 | MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"), | |
4a54abbb | 3774 | MAPPING_INIT(".ARM.extab", ".ARM.extab"), |
1dcd334d | 3775 | MAPPING_INIT(".gnu.linkonce.armextab.", ".ARM.extab"), |
4a54abbb | 3776 | MAPPING_INIT(".ARM.exidx", ".ARM.exidx"), |
1dcd334d | 3777 | MAPPING_INIT(".gnu.linkonce.armexidx.", ".ARM.exidx"), |
a2fb1b05 ILT |
3778 | }; |
3779 | #undef MAPPING_INIT | |
3780 | ||
dff16297 ILT |
3781 | const int Layout::section_name_mapping_count = |
3782 | (sizeof(Layout::section_name_mapping) | |
3783 | / sizeof(Layout::section_name_mapping[0])); | |
a2fb1b05 | 3784 | |
ead1e424 ILT |
3785 | // Choose the output section name to use given an input section name. |
3786 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
3787 | // length of NAME. | |
3788 | ||
3789 | const char* | |
3790 | Layout::output_section_name(const char* name, size_t* plen) | |
3791 | { | |
af4a8a83 ILT |
3792 | // gcc 4.3 generates the following sorts of section names when it |
3793 | // needs a section name specific to a function: | |
3794 | // .text.FN | |
3795 | // .rodata.FN | |
3796 | // .sdata2.FN | |
3797 | // .data.FN | |
3798 | // .data.rel.FN | |
3799 | // .data.rel.local.FN | |
3800 | // .data.rel.ro.FN | |
3801 | // .data.rel.ro.local.FN | |
3802 | // .sdata.FN | |
3803 | // .bss.FN | |
3804 | // .sbss.FN | |
3805 | // .tdata.FN | |
3806 | // .tbss.FN | |
3807 | ||
3808 | // The GNU linker maps all of those to the part before the .FN, | |
3809 | // except that .data.rel.local.FN is mapped to .data, and | |
3810 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
3811 | // beginning with .data.rel.ro.local are grouped together. | |
3812 | ||
3813 | // For an anonymous namespace, the string FN can contain a '.'. | |
3814 | ||
3815 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
3816 | // GNU linker maps to .rodata. | |
3817 | ||
dff16297 ILT |
3818 | // The .data.rel.ro sections are used with -z relro. The sections |
3819 | // are recognized by name. We use the same names that the GNU | |
3820 | // linker does for these sections. | |
af4a8a83 | 3821 | |
dff16297 ILT |
3822 | // It is hard to handle this in a principled way, so we don't even |
3823 | // try. We use a table of mappings. If the input section name is | |
3824 | // not found in the table, we simply use it as the output section | |
3825 | // name. | |
af4a8a83 | 3826 | |
dff16297 ILT |
3827 | const Section_name_mapping* psnm = section_name_mapping; |
3828 | for (int i = 0; i < section_name_mapping_count; ++i, ++psnm) | |
ead1e424 | 3829 | { |
dff16297 ILT |
3830 | if (strncmp(name, psnm->from, psnm->fromlen) == 0) |
3831 | { | |
3832 | *plen = psnm->tolen; | |
3833 | return psnm->to; | |
3834 | } | |
ead1e424 ILT |
3835 | } |
3836 | ||
a2e47362 CC |
3837 | // Compressed debug sections should be mapped to the corresponding |
3838 | // uncompressed section. | |
3839 | if (is_compressed_debug_section(name)) | |
3840 | { | |
3841 | size_t len = strlen(name); | |
3842 | char *uncompressed_name = new char[len]; | |
3843 | uncompressed_name[0] = '.'; | |
3844 | gold_assert(name[0] == '.' && name[1] == 'z'); | |
3845 | strncpy(&uncompressed_name[1], &name[2], len - 2); | |
3846 | uncompressed_name[len - 1] = '\0'; | |
3847 | *plen = len - 1; | |
3848 | return uncompressed_name; | |
3849 | } | |
3850 | ||
ead1e424 ILT |
3851 | return name; |
3852 | } | |
3853 | ||
8a4c0b0d ILT |
3854 | // Check if a comdat group or .gnu.linkonce section with the given |
3855 | // NAME is selected for the link. If there is already a section, | |
1ef4d87f ILT |
3856 | // *KEPT_SECTION is set to point to the existing section and the |
3857 | // function returns false. Otherwise, OBJECT, SHNDX, IS_COMDAT, and | |
3858 | // IS_GROUP_NAME are recorded for this NAME in the layout object, | |
3859 | // *KEPT_SECTION is set to the internal copy and the function returns | |
3860 | // true. | |
a2fb1b05 ILT |
3861 | |
3862 | bool | |
e55bde5e | 3863 | Layout::find_or_add_kept_section(const std::string& name, |
1ef4d87f ILT |
3864 | Relobj* object, |
3865 | unsigned int shndx, | |
3866 | bool is_comdat, | |
3867 | bool is_group_name, | |
8a4c0b0d | 3868 | Kept_section** kept_section) |
a2fb1b05 | 3869 | { |
e55bde5e ILT |
3870 | // It's normal to see a couple of entries here, for the x86 thunk |
3871 | // sections. If we see more than a few, we're linking a C++ | |
3872 | // program, and we resize to get more space to minimize rehashing. | |
3873 | if (this->signatures_.size() > 4 | |
3874 | && !this->resized_signatures_) | |
3875 | { | |
3876 | reserve_unordered_map(&this->signatures_, | |
3877 | this->number_of_input_files_ * 64); | |
3878 | this->resized_signatures_ = true; | |
3879 | } | |
3880 | ||
1ef4d87f ILT |
3881 | Kept_section candidate; |
3882 | std::pair<Signatures::iterator, bool> ins = | |
3883 | this->signatures_.insert(std::make_pair(name, candidate)); | |
a2fb1b05 | 3884 | |
1ef4d87f | 3885 | if (kept_section != NULL) |
8a4c0b0d | 3886 | *kept_section = &ins.first->second; |
a2fb1b05 ILT |
3887 | if (ins.second) |
3888 | { | |
3889 | // This is the first time we've seen this signature. | |
1ef4d87f ILT |
3890 | ins.first->second.set_object(object); |
3891 | ins.first->second.set_shndx(shndx); | |
3892 | if (is_comdat) | |
3893 | ins.first->second.set_is_comdat(); | |
3894 | if (is_group_name) | |
3895 | ins.first->second.set_is_group_name(); | |
a2fb1b05 ILT |
3896 | return true; |
3897 | } | |
3898 | ||
1ef4d87f ILT |
3899 | // We have already seen this signature. |
3900 | ||
3901 | if (ins.first->second.is_group_name()) | |
a2fb1b05 ILT |
3902 | { |
3903 | // We've already seen a real section group with this signature. | |
1ef4d87f ILT |
3904 | // If the kept group is from a plugin object, and we're in the |
3905 | // replacement phase, accept the new one as a replacement. | |
3906 | if (ins.first->second.object() == NULL | |
2756a258 CC |
3907 | && parameters->options().plugins()->in_replacement_phase()) |
3908 | { | |
1ef4d87f ILT |
3909 | ins.first->second.set_object(object); |
3910 | ins.first->second.set_shndx(shndx); | |
2756a258 CC |
3911 | return true; |
3912 | } | |
a2fb1b05 ILT |
3913 | return false; |
3914 | } | |
1ef4d87f | 3915 | else if (is_group_name) |
a2fb1b05 ILT |
3916 | { |
3917 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 3918 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 | 3919 | // a section group, and don't include this section group. |
1ef4d87f | 3920 | ins.first->second.set_is_group_name(); |
a2fb1b05 ILT |
3921 | return false; |
3922 | } | |
3923 | else | |
3924 | { | |
3925 | // We've already seen a linkonce section and this is a linkonce | |
3926 | // section. These don't block each other--this may be the same | |
3927 | // symbol name with different section types. | |
3928 | return true; | |
3929 | } | |
3930 | } | |
3931 | ||
a445fddf ILT |
3932 | // Store the allocated sections into the section list. |
3933 | ||
3934 | void | |
2ea97941 | 3935 | Layout::get_allocated_sections(Section_list* section_list) const |
a445fddf ILT |
3936 | { |
3937 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3938 | p != this->section_list_.end(); | |
3939 | ++p) | |
3940 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) | |
2ea97941 | 3941 | section_list->push_back(*p); |
a445fddf ILT |
3942 | } |
3943 | ||
3944 | // Create an output segment. | |
3945 | ||
3946 | Output_segment* | |
3947 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
3948 | { | |
8851ecca | 3949 | gold_assert(!parameters->options().relocatable()); |
a445fddf ILT |
3950 | Output_segment* oseg = new Output_segment(type, flags); |
3951 | this->segment_list_.push_back(oseg); | |
2d924fd9 ILT |
3952 | |
3953 | if (type == elfcpp::PT_TLS) | |
3954 | this->tls_segment_ = oseg; | |
3955 | else if (type == elfcpp::PT_GNU_RELRO) | |
3956 | this->relro_segment_ = oseg; | |
3957 | ||
a445fddf ILT |
3958 | return oseg; |
3959 | } | |
3960 | ||
730cdc88 ILT |
3961 | // Write out the Output_sections. Most won't have anything to write, |
3962 | // since most of the data will come from input sections which are | |
3963 | // handled elsewhere. But some Output_sections do have Output_data. | |
3964 | ||
3965 | void | |
3966 | Layout::write_output_sections(Output_file* of) const | |
3967 | { | |
3968 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3969 | p != this->section_list_.end(); | |
3970 | ++p) | |
3971 | { | |
3972 | if (!(*p)->after_input_sections()) | |
3973 | (*p)->write(of); | |
3974 | } | |
3975 | } | |
3976 | ||
61ba1cf9 ILT |
3977 | // Write out data not associated with a section or the symbol table. |
3978 | ||
3979 | void | |
9025d29d | 3980 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 3981 | { |
8851ecca | 3982 | if (!parameters->options().strip_all()) |
a3ad94ed | 3983 | { |
2ea97941 | 3984 | const Output_section* symtab_section = this->symtab_section_; |
9e2dcb77 ILT |
3985 | for (Section_list::const_iterator p = this->section_list_.begin(); |
3986 | p != this->section_list_.end(); | |
3987 | ++p) | |
a3ad94ed | 3988 | { |
9e2dcb77 ILT |
3989 | if ((*p)->needs_symtab_index()) |
3990 | { | |
2ea97941 | 3991 | gold_assert(symtab_section != NULL); |
9e2dcb77 ILT |
3992 | unsigned int index = (*p)->symtab_index(); |
3993 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
3994 | off_t off = (symtab_section->offset() |
3995 | + index * symtab_section->entsize()); | |
d491d34e | 3996 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
9e2dcb77 | 3997 | } |
a3ad94ed ILT |
3998 | } |
3999 | } | |
4000 | ||
2ea97941 | 4001 | const Output_section* dynsym_section = this->dynsym_section_; |
a3ad94ed ILT |
4002 | for (Section_list::const_iterator p = this->section_list_.begin(); |
4003 | p != this->section_list_.end(); | |
4004 | ++p) | |
4005 | { | |
4006 | if ((*p)->needs_dynsym_index()) | |
4007 | { | |
2ea97941 | 4008 | gold_assert(dynsym_section != NULL); |
a3ad94ed ILT |
4009 | unsigned int index = (*p)->dynsym_index(); |
4010 | gold_assert(index > 0 && index != -1U); | |
2ea97941 ILT |
4011 | off_t off = (dynsym_section->offset() |
4012 | + index * dynsym_section->entsize()); | |
d491d34e | 4013 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
a3ad94ed ILT |
4014 | } |
4015 | } | |
4016 | ||
a3ad94ed | 4017 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
4018 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
4019 | p != this->special_output_list_.end(); | |
4020 | ++p) | |
4021 | (*p)->write(of); | |
4022 | } | |
4023 | ||
730cdc88 ILT |
4024 | // Write out the Output_sections which can only be written after the |
4025 | // input sections are complete. | |
4026 | ||
4027 | void | |
27bc2bce | 4028 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 4029 | { |
27bc2bce | 4030 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
4031 | // file size. Note we finalize the .shstrab last, to allow the |
4032 | // after_input_section sections to modify their section-names before | |
4033 | // writing. | |
17a1d0a9 | 4034 | if (this->any_postprocessing_sections_) |
27bc2bce | 4035 | { |
17a1d0a9 ILT |
4036 | off_t off = this->output_file_size_; |
4037 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); | |
8a4c0b0d | 4038 | |
17a1d0a9 ILT |
4039 | // Now that we've finalized the names, we can finalize the shstrab. |
4040 | off = | |
4041 | this->set_section_offsets(off, | |
4042 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
4043 | ||
4044 | if (off > this->output_file_size_) | |
4045 | { | |
4046 | of->resize(off); | |
4047 | this->output_file_size_ = off; | |
4048 | } | |
27bc2bce ILT |
4049 | } |
4050 | ||
730cdc88 ILT |
4051 | for (Section_list::const_iterator p = this->section_list_.begin(); |
4052 | p != this->section_list_.end(); | |
4053 | ++p) | |
4054 | { | |
4055 | if ((*p)->after_input_sections()) | |
4056 | (*p)->write(of); | |
4057 | } | |
27bc2bce | 4058 | |
27bc2bce | 4059 | this->section_headers_->write(of); |
730cdc88 ILT |
4060 | } |
4061 | ||
8ed814a9 ILT |
4062 | // If the build ID requires computing a checksum, do so here, and |
4063 | // write it out. We compute a checksum over the entire file because | |
4064 | // that is simplest. | |
4065 | ||
4066 | void | |
4067 | Layout::write_build_id(Output_file* of) const | |
4068 | { | |
4069 | if (this->build_id_note_ == NULL) | |
4070 | return; | |
4071 | ||
4072 | const unsigned char* iv = of->get_input_view(0, this->output_file_size_); | |
4073 | ||
4074 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), | |
4075 | this->build_id_note_->data_size()); | |
4076 | ||
4077 | const char* style = parameters->options().build_id(); | |
4078 | if (strcmp(style, "sha1") == 0) | |
4079 | { | |
4080 | sha1_ctx ctx; | |
4081 | sha1_init_ctx(&ctx); | |
4082 | sha1_process_bytes(iv, this->output_file_size_, &ctx); | |
4083 | sha1_finish_ctx(&ctx, ov); | |
4084 | } | |
4085 | else if (strcmp(style, "md5") == 0) | |
4086 | { | |
4087 | md5_ctx ctx; | |
4088 | md5_init_ctx(&ctx); | |
4089 | md5_process_bytes(iv, this->output_file_size_, &ctx); | |
4090 | md5_finish_ctx(&ctx, ov); | |
4091 | } | |
4092 | else | |
4093 | gold_unreachable(); | |
4094 | ||
4095 | of->write_output_view(this->build_id_note_->offset(), | |
4096 | this->build_id_note_->data_size(), | |
4097 | ov); | |
4098 | ||
4099 | of->free_input_view(0, this->output_file_size_, iv); | |
4100 | } | |
4101 | ||
516cb3d0 ILT |
4102 | // Write out a binary file. This is called after the link is |
4103 | // complete. IN is the temporary output file we used to generate the | |
4104 | // ELF code. We simply walk through the segments, read them from | |
4105 | // their file offset in IN, and write them to their load address in | |
4106 | // the output file. FIXME: with a bit more work, we could support | |
4107 | // S-records and/or Intel hex format here. | |
4108 | ||
4109 | void | |
4110 | Layout::write_binary(Output_file* in) const | |
4111 | { | |
e55bde5e | 4112 | gold_assert(parameters->options().oformat_enum() |
bc644c6c | 4113 | == General_options::OBJECT_FORMAT_BINARY); |
516cb3d0 ILT |
4114 | |
4115 | // Get the size of the binary file. | |
4116 | uint64_t max_load_address = 0; | |
4117 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4118 | p != this->segment_list_.end(); | |
4119 | ++p) | |
4120 | { | |
4121 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
4122 | { | |
4123 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); | |
4124 | if (max_paddr > max_load_address) | |
4125 | max_load_address = max_paddr; | |
4126 | } | |
4127 | } | |
4128 | ||
8851ecca | 4129 | Output_file out(parameters->options().output_file_name()); |
516cb3d0 ILT |
4130 | out.open(max_load_address); |
4131 | ||
4132 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4133 | p != this->segment_list_.end(); | |
4134 | ++p) | |
4135 | { | |
4136 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
4137 | { | |
4138 | const unsigned char* vin = in->get_input_view((*p)->offset(), | |
4139 | (*p)->filesz()); | |
4140 | unsigned char* vout = out.get_output_view((*p)->paddr(), | |
4141 | (*p)->filesz()); | |
4142 | memcpy(vout, vin, (*p)->filesz()); | |
4143 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); | |
4144 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); | |
4145 | } | |
4146 | } | |
4147 | ||
4148 | out.close(); | |
4149 | } | |
4150 | ||
7d9e3d98 ILT |
4151 | // Print the output sections to the map file. |
4152 | ||
4153 | void | |
4154 | Layout::print_to_mapfile(Mapfile* mapfile) const | |
4155 | { | |
4156 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
4157 | p != this->segment_list_.end(); | |
4158 | ++p) | |
4159 | (*p)->print_sections_to_mapfile(mapfile); | |
4160 | } | |
4161 | ||
ad8f37d1 ILT |
4162 | // Print statistical information to stderr. This is used for --stats. |
4163 | ||
4164 | void | |
4165 | Layout::print_stats() const | |
4166 | { | |
4167 | this->namepool_.print_stats("section name pool"); | |
4168 | this->sympool_.print_stats("output symbol name pool"); | |
4169 | this->dynpool_.print_stats("dynamic name pool"); | |
38c5e8b4 ILT |
4170 | |
4171 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
4172 | p != this->section_list_.end(); | |
4173 | ++p) | |
4174 | (*p)->print_merge_stats(); | |
ad8f37d1 ILT |
4175 | } |
4176 | ||
730cdc88 ILT |
4177 | // Write_sections_task methods. |
4178 | ||
4179 | // We can always run this task. | |
4180 | ||
17a1d0a9 ILT |
4181 | Task_token* |
4182 | Write_sections_task::is_runnable() | |
730cdc88 | 4183 | { |
17a1d0a9 | 4184 | return NULL; |
730cdc88 ILT |
4185 | } |
4186 | ||
4187 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
4188 | // when finished. | |
4189 | ||
17a1d0a9 ILT |
4190 | void |
4191 | Write_sections_task::locks(Task_locker* tl) | |
730cdc88 | 4192 | { |
17a1d0a9 ILT |
4193 | tl->add(this, this->output_sections_blocker_); |
4194 | tl->add(this, this->final_blocker_); | |
730cdc88 ILT |
4195 | } |
4196 | ||
4197 | // Run the task--write out the data. | |
4198 | ||
4199 | void | |
4200 | Write_sections_task::run(Workqueue*) | |
4201 | { | |
4202 | this->layout_->write_output_sections(this->of_); | |
4203 | } | |
4204 | ||
61ba1cf9 ILT |
4205 | // Write_data_task methods. |
4206 | ||
4207 | // We can always run this task. | |
4208 | ||
17a1d0a9 ILT |
4209 | Task_token* |
4210 | Write_data_task::is_runnable() | |
61ba1cf9 | 4211 | { |
17a1d0a9 | 4212 | return NULL; |
61ba1cf9 ILT |
4213 | } |
4214 | ||
4215 | // We need to unlock FINAL_BLOCKER when finished. | |
4216 | ||
17a1d0a9 ILT |
4217 | void |
4218 | Write_data_task::locks(Task_locker* tl) | |
61ba1cf9 | 4219 | { |
17a1d0a9 | 4220 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
4221 | } |
4222 | ||
4223 | // Run the task--write out the data. | |
4224 | ||
4225 | void | |
4226 | Write_data_task::run(Workqueue*) | |
4227 | { | |
9025d29d | 4228 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
4229 | } |
4230 | ||
4231 | // Write_symbols_task methods. | |
4232 | ||
4233 | // We can always run this task. | |
4234 | ||
17a1d0a9 ILT |
4235 | Task_token* |
4236 | Write_symbols_task::is_runnable() | |
61ba1cf9 | 4237 | { |
17a1d0a9 | 4238 | return NULL; |
61ba1cf9 ILT |
4239 | } |
4240 | ||
4241 | // We need to unlock FINAL_BLOCKER when finished. | |
4242 | ||
17a1d0a9 ILT |
4243 | void |
4244 | Write_symbols_task::locks(Task_locker* tl) | |
61ba1cf9 | 4245 | { |
17a1d0a9 | 4246 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
4247 | } |
4248 | ||
4249 | // Run the task--write out the symbols. | |
4250 | ||
4251 | void | |
4252 | Write_symbols_task::run(Workqueue*) | |
4253 | { | |
fd9d194f ILT |
4254 | this->symtab_->write_globals(this->sympool_, this->dynpool_, |
4255 | this->layout_->symtab_xindex(), | |
d491d34e | 4256 | this->layout_->dynsym_xindex(), this->of_); |
61ba1cf9 ILT |
4257 | } |
4258 | ||
730cdc88 ILT |
4259 | // Write_after_input_sections_task methods. |
4260 | ||
4261 | // We can only run this task after the input sections have completed. | |
4262 | ||
17a1d0a9 ILT |
4263 | Task_token* |
4264 | Write_after_input_sections_task::is_runnable() | |
730cdc88 ILT |
4265 | { |
4266 | if (this->input_sections_blocker_->is_blocked()) | |
17a1d0a9 ILT |
4267 | return this->input_sections_blocker_; |
4268 | return NULL; | |
730cdc88 ILT |
4269 | } |
4270 | ||
4271 | // We need to unlock FINAL_BLOCKER when finished. | |
4272 | ||
17a1d0a9 ILT |
4273 | void |
4274 | Write_after_input_sections_task::locks(Task_locker* tl) | |
730cdc88 | 4275 | { |
17a1d0a9 | 4276 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
4277 | } |
4278 | ||
4279 | // Run the task. | |
4280 | ||
4281 | void | |
4282 | Write_after_input_sections_task::run(Workqueue*) | |
4283 | { | |
4284 | this->layout_->write_sections_after_input_sections(this->of_); | |
4285 | } | |
4286 | ||
92e059d8 | 4287 | // Close_task_runner methods. |
61ba1cf9 ILT |
4288 | |
4289 | // Run the task--close the file. | |
4290 | ||
4291 | void | |
17a1d0a9 | 4292 | Close_task_runner::run(Workqueue*, const Task*) |
61ba1cf9 | 4293 | { |
8ed814a9 ILT |
4294 | // If we need to compute a checksum for the BUILD if, we do so here. |
4295 | this->layout_->write_build_id(this->of_); | |
4296 | ||
516cb3d0 | 4297 | // If we've been asked to create a binary file, we do so here. |
7cc619c3 | 4298 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
4299 | this->layout_->write_binary(this->of_); |
4300 | ||
61ba1cf9 ILT |
4301 | this->of_->close(); |
4302 | } | |
4303 | ||
a2fb1b05 ILT |
4304 | // Instantiate the templates we need. We could use the configure |
4305 | // script to restrict this to only the ones for implemented targets. | |
4306 | ||
193a53d9 | 4307 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 ILT |
4308 | template |
4309 | Output_section* | |
730cdc88 ILT |
4310 | Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx, |
4311 | const char* name, | |
4312 | const elfcpp::Shdr<32, false>& shdr, | |
4313 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 4314 | #endif |
a2fb1b05 | 4315 | |
193a53d9 | 4316 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
4317 | template |
4318 | Output_section* | |
730cdc88 ILT |
4319 | Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx, |
4320 | const char* name, | |
4321 | const elfcpp::Shdr<32, true>& shdr, | |
4322 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 4323 | #endif |
a2fb1b05 | 4324 | |
193a53d9 | 4325 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
4326 | template |
4327 | Output_section* | |
730cdc88 ILT |
4328 | Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx, |
4329 | const char* name, | |
4330 | const elfcpp::Shdr<64, false>& shdr, | |
4331 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 4332 | #endif |
a2fb1b05 | 4333 | |
193a53d9 | 4334 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
4335 | template |
4336 | Output_section* | |
730cdc88 ILT |
4337 | Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx, |
4338 | const char* name, | |
4339 | const elfcpp::Shdr<64, true>& shdr, | |
4340 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 4341 | #endif |
a2fb1b05 | 4342 | |
6a74a719 ILT |
4343 | #ifdef HAVE_TARGET_32_LITTLE |
4344 | template | |
4345 | Output_section* | |
4346 | Layout::layout_reloc<32, false>(Sized_relobj<32, false>* object, | |
4347 | unsigned int reloc_shndx, | |
4348 | const elfcpp::Shdr<32, false>& shdr, | |
4349 | Output_section* data_section, | |
4350 | Relocatable_relocs* rr); | |
4351 | #endif | |
4352 | ||
4353 | #ifdef HAVE_TARGET_32_BIG | |
4354 | template | |
4355 | Output_section* | |
4356 | Layout::layout_reloc<32, true>(Sized_relobj<32, true>* object, | |
4357 | unsigned int reloc_shndx, | |
4358 | const elfcpp::Shdr<32, true>& shdr, | |
4359 | Output_section* data_section, | |
4360 | Relocatable_relocs* rr); | |
4361 | #endif | |
4362 | ||
4363 | #ifdef HAVE_TARGET_64_LITTLE | |
4364 | template | |
4365 | Output_section* | |
4366 | Layout::layout_reloc<64, false>(Sized_relobj<64, false>* object, | |
4367 | unsigned int reloc_shndx, | |
4368 | const elfcpp::Shdr<64, false>& shdr, | |
4369 | Output_section* data_section, | |
4370 | Relocatable_relocs* rr); | |
4371 | #endif | |
4372 | ||
4373 | #ifdef HAVE_TARGET_64_BIG | |
4374 | template | |
4375 | Output_section* | |
4376 | Layout::layout_reloc<64, true>(Sized_relobj<64, true>* object, | |
4377 | unsigned int reloc_shndx, | |
4378 | const elfcpp::Shdr<64, true>& shdr, | |
4379 | Output_section* data_section, | |
4380 | Relocatable_relocs* rr); | |
4381 | #endif | |
4382 | ||
4383 | #ifdef HAVE_TARGET_32_LITTLE | |
4384 | template | |
4385 | void | |
4386 | Layout::layout_group<32, false>(Symbol_table* symtab, | |
4387 | Sized_relobj<32, false>* object, | |
4388 | unsigned int, | |
4389 | const char* group_section_name, | |
4390 | const char* signature, | |
4391 | const elfcpp::Shdr<32, false>& shdr, | |
8825ac63 ILT |
4392 | elfcpp::Elf_Word flags, |
4393 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
4394 | #endif |
4395 | ||
4396 | #ifdef HAVE_TARGET_32_BIG | |
4397 | template | |
4398 | void | |
4399 | Layout::layout_group<32, true>(Symbol_table* symtab, | |
4400 | Sized_relobj<32, true>* object, | |
4401 | unsigned int, | |
4402 | const char* group_section_name, | |
4403 | const char* signature, | |
4404 | const elfcpp::Shdr<32, true>& shdr, | |
8825ac63 ILT |
4405 | elfcpp::Elf_Word flags, |
4406 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
4407 | #endif |
4408 | ||
4409 | #ifdef HAVE_TARGET_64_LITTLE | |
4410 | template | |
4411 | void | |
4412 | Layout::layout_group<64, false>(Symbol_table* symtab, | |
4413 | Sized_relobj<64, false>* object, | |
4414 | unsigned int, | |
4415 | const char* group_section_name, | |
4416 | const char* signature, | |
4417 | const elfcpp::Shdr<64, false>& shdr, | |
8825ac63 ILT |
4418 | elfcpp::Elf_Word flags, |
4419 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
4420 | #endif |
4421 | ||
4422 | #ifdef HAVE_TARGET_64_BIG | |
4423 | template | |
4424 | void | |
4425 | Layout::layout_group<64, true>(Symbol_table* symtab, | |
4426 | Sized_relobj<64, true>* object, | |
4427 | unsigned int, | |
4428 | const char* group_section_name, | |
4429 | const char* signature, | |
4430 | const elfcpp::Shdr<64, true>& shdr, | |
8825ac63 ILT |
4431 | elfcpp::Elf_Word flags, |
4432 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
4433 | #endif |
4434 | ||
730cdc88 ILT |
4435 | #ifdef HAVE_TARGET_32_LITTLE |
4436 | template | |
4437 | Output_section* | |
4438 | Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object, | |
4439 | const unsigned char* symbols, | |
4440 | off_t symbols_size, | |
4441 | const unsigned char* symbol_names, | |
4442 | off_t symbol_names_size, | |
4443 | unsigned int shndx, | |
4444 | const elfcpp::Shdr<32, false>& shdr, | |
4445 | unsigned int reloc_shndx, | |
4446 | unsigned int reloc_type, | |
4447 | off_t* off); | |
4448 | #endif | |
4449 | ||
4450 | #ifdef HAVE_TARGET_32_BIG | |
4451 | template | |
4452 | Output_section* | |
4453 | Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object, | |
4454 | const unsigned char* symbols, | |
4455 | off_t symbols_size, | |
4456 | const unsigned char* symbol_names, | |
4457 | off_t symbol_names_size, | |
4458 | unsigned int shndx, | |
4459 | const elfcpp::Shdr<32, true>& shdr, | |
4460 | unsigned int reloc_shndx, | |
4461 | unsigned int reloc_type, | |
4462 | off_t* off); | |
4463 | #endif | |
4464 | ||
4465 | #ifdef HAVE_TARGET_64_LITTLE | |
4466 | template | |
4467 | Output_section* | |
4468 | Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object, | |
4469 | const unsigned char* symbols, | |
4470 | off_t symbols_size, | |
4471 | const unsigned char* symbol_names, | |
4472 | off_t symbol_names_size, | |
4473 | unsigned int shndx, | |
4474 | const elfcpp::Shdr<64, false>& shdr, | |
4475 | unsigned int reloc_shndx, | |
4476 | unsigned int reloc_type, | |
4477 | off_t* off); | |
4478 | #endif | |
4479 | ||
4480 | #ifdef HAVE_TARGET_64_BIG | |
4481 | template | |
4482 | Output_section* | |
4483 | Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object, | |
4484 | const unsigned char* symbols, | |
4485 | off_t symbols_size, | |
4486 | const unsigned char* symbol_names, | |
4487 | off_t symbol_names_size, | |
4488 | unsigned int shndx, | |
4489 | const elfcpp::Shdr<64, true>& shdr, | |
4490 | unsigned int reloc_shndx, | |
4491 | unsigned int reloc_type, | |
4492 | off_t* off); | |
4493 | #endif | |
a2fb1b05 ILT |
4494 | |
4495 | } // End namespace gold. |