Commit | Line | Data |
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a2fb1b05 ILT |
1 | // layout.cc -- lay out output file sections for gold |
2 | ||
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 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 ILT |
28 | #include <iostream> |
29 | #include <utility> | |
8ed814a9 ILT |
30 | #include <fcntl.h> |
31 | #include <unistd.h> | |
32 | #include "libiberty.h" | |
33 | #include "md5.h" | |
34 | #include "sha1.h" | |
a2fb1b05 | 35 | |
7e1edb90 | 36 | #include "parameters.h" |
14144f39 | 37 | #include "options.h" |
7d9e3d98 | 38 | #include "mapfile.h" |
a445fddf ILT |
39 | #include "script.h" |
40 | #include "script-sections.h" | |
a2fb1b05 | 41 | #include "output.h" |
f6ce93d6 | 42 | #include "symtab.h" |
a3ad94ed | 43 | #include "dynobj.h" |
3151305a | 44 | #include "ehframe.h" |
96803768 | 45 | #include "compressed_output.h" |
62b01cb5 | 46 | #include "reduced_debug_output.h" |
6a74a719 | 47 | #include "reloc.h" |
2a00e4fb | 48 | #include "descriptors.h" |
2756a258 | 49 | #include "plugin.h" |
3ce2c28e ILT |
50 | #include "incremental.h" |
51 | #include "layout.h" | |
a2fb1b05 ILT |
52 | |
53 | namespace gold | |
54 | { | |
55 | ||
20e6d0d6 DK |
56 | // Layout::Relaxation_debug_check methods. |
57 | ||
58 | // Check that sections and special data are in reset states. | |
59 | // We do not save states for Output_sections and special Output_data. | |
60 | // So we check that they have not assigned any addresses or offsets. | |
61 | // clean_up_after_relaxation simply resets their addresses and offsets. | |
62 | void | |
63 | Layout::Relaxation_debug_check::check_output_data_for_reset_values( | |
64 | const Layout::Section_list& sections, | |
65 | const Layout::Data_list& special_outputs) | |
66 | { | |
67 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
68 | p != sections.end(); | |
69 | ++p) | |
70 | gold_assert((*p)->address_and_file_offset_have_reset_values()); | |
71 | ||
72 | for(Layout::Data_list::const_iterator p = special_outputs.begin(); | |
73 | p != special_outputs.end(); | |
74 | ++p) | |
75 | gold_assert((*p)->address_and_file_offset_have_reset_values()); | |
76 | } | |
77 | ||
78 | // Save information of SECTIONS for checking later. | |
79 | ||
80 | void | |
81 | Layout::Relaxation_debug_check::read_sections( | |
82 | const Layout::Section_list& sections) | |
83 | { | |
84 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
85 | p != sections.end(); | |
86 | ++p) | |
87 | { | |
88 | Output_section* os = *p; | |
89 | Section_info info; | |
90 | info.output_section = os; | |
91 | info.address = os->is_address_valid() ? os->address() : 0; | |
92 | info.data_size = os->is_data_size_valid() ? os->data_size() : -1; | |
93 | info.offset = os->is_offset_valid()? os->offset() : -1 ; | |
94 | this->section_infos_.push_back(info); | |
95 | } | |
96 | } | |
97 | ||
98 | // Verify SECTIONS using previously recorded information. | |
99 | ||
100 | void | |
101 | Layout::Relaxation_debug_check::verify_sections( | |
102 | const Layout::Section_list& sections) | |
103 | { | |
104 | size_t i = 0; | |
105 | for(Layout::Section_list::const_iterator p = sections.begin(); | |
106 | p != sections.end(); | |
107 | ++p, ++i) | |
108 | { | |
109 | Output_section* os = *p; | |
110 | uint64_t address = os->is_address_valid() ? os->address() : 0; | |
111 | off_t data_size = os->is_data_size_valid() ? os->data_size() : -1; | |
112 | off_t offset = os->is_offset_valid()? os->offset() : -1 ; | |
113 | ||
114 | if (i >= this->section_infos_.size()) | |
115 | { | |
116 | gold_fatal("Section_info of %s missing.\n", os->name()); | |
117 | } | |
118 | const Section_info& info = this->section_infos_[i]; | |
119 | if (os != info.output_section) | |
120 | gold_fatal("Section order changed. Expecting %s but see %s\n", | |
121 | info.output_section->name(), os->name()); | |
122 | if (address != info.address | |
123 | || data_size != info.data_size | |
124 | || offset != info.offset) | |
125 | gold_fatal("Section %s changed.\n", os->name()); | |
126 | } | |
127 | } | |
128 | ||
92e059d8 | 129 | // Layout_task_runner methods. |
a2fb1b05 ILT |
130 | |
131 | // Lay out the sections. This is called after all the input objects | |
132 | // have been read. | |
133 | ||
134 | void | |
17a1d0a9 | 135 | Layout_task_runner::run(Workqueue* workqueue, const Task* task) |
a2fb1b05 | 136 | { |
12e14209 | 137 | off_t file_size = this->layout_->finalize(this->input_objects_, |
17a1d0a9 | 138 | this->symtab_, |
8851ecca | 139 | this->target_, |
17a1d0a9 | 140 | task); |
61ba1cf9 ILT |
141 | |
142 | // Now we know the final size of the output file and we know where | |
143 | // each piece of information goes. | |
7d9e3d98 ILT |
144 | |
145 | if (this->mapfile_ != NULL) | |
146 | { | |
147 | this->mapfile_->print_discarded_sections(this->input_objects_); | |
148 | this->layout_->print_to_mapfile(this->mapfile_); | |
149 | } | |
150 | ||
8851ecca | 151 | Output_file* of = new Output_file(parameters->options().output_file_name()); |
7cc619c3 | 152 | if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 | 153 | of->set_is_temporary(); |
61ba1cf9 ILT |
154 | of->open(file_size); |
155 | ||
156 | // Queue up the final set of tasks. | |
157 | gold::queue_final_tasks(this->options_, this->input_objects_, | |
12e14209 | 158 | this->symtab_, this->layout_, workqueue, of); |
a2fb1b05 ILT |
159 | } |
160 | ||
161 | // Layout methods. | |
162 | ||
e55bde5e ILT |
163 | Layout::Layout(int number_of_input_files, Script_options* script_options) |
164 | : number_of_input_files_(number_of_input_files), | |
d491d34e ILT |
165 | script_options_(script_options), |
166 | namepool_(), | |
167 | sympool_(), | |
168 | dynpool_(), | |
169 | signatures_(), | |
170 | section_name_map_(), | |
171 | segment_list_(), | |
172 | section_list_(), | |
173 | unattached_section_list_(), | |
d491d34e ILT |
174 | special_output_list_(), |
175 | section_headers_(NULL), | |
176 | tls_segment_(NULL), | |
9f1d377b | 177 | relro_segment_(NULL), |
d491d34e ILT |
178 | symtab_section_(NULL), |
179 | symtab_xindex_(NULL), | |
180 | dynsym_section_(NULL), | |
181 | dynsym_xindex_(NULL), | |
182 | dynamic_section_(NULL), | |
183 | dynamic_data_(NULL), | |
184 | eh_frame_section_(NULL), | |
185 | eh_frame_data_(NULL), | |
186 | added_eh_frame_data_(false), | |
187 | eh_frame_hdr_section_(NULL), | |
188 | build_id_note_(NULL), | |
62b01cb5 ILT |
189 | debug_abbrev_(NULL), |
190 | debug_info_(NULL), | |
d491d34e ILT |
191 | group_signatures_(), |
192 | output_file_size_(-1), | |
e55bde5e | 193 | sections_are_attached_(false), |
35cdfc9a ILT |
194 | input_requires_executable_stack_(false), |
195 | input_with_gnu_stack_note_(false), | |
535890bb | 196 | input_without_gnu_stack_note_(false), |
17a1d0a9 | 197 | has_static_tls_(false), |
e55bde5e | 198 | any_postprocessing_sections_(false), |
3ce2c28e | 199 | resized_signatures_(false), |
1518dc8f | 200 | have_stabstr_section_(false), |
20e6d0d6 DK |
201 | incremental_inputs_(NULL), |
202 | record_output_section_data_from_script_(false), | |
203 | script_output_section_data_list_(), | |
204 | segment_states_(NULL), | |
205 | relaxation_debug_check_(NULL) | |
54dc6425 ILT |
206 | { |
207 | // Make space for more than enough segments for a typical file. | |
208 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
209 | this->segment_list_.reserve(12); |
210 | ||
27bc2bce ILT |
211 | // We expect two unattached Output_data objects: the file header and |
212 | // the segment headers. | |
213 | this->special_output_list_.reserve(2); | |
3ce2c28e ILT |
214 | |
215 | // Initialize structure needed for an incremental build. | |
216 | if (parameters->options().incremental()) | |
217 | this->incremental_inputs_ = new Incremental_inputs; | |
f7c8a183 ILT |
218 | |
219 | // The section name pool is worth optimizing in all cases, because | |
220 | // it is small, but there are often overlaps due to .rel sections. | |
221 | this->namepool_.set_optimize(); | |
54dc6425 ILT |
222 | } |
223 | ||
a2fb1b05 ILT |
224 | // Hash a key we use to look up an output section mapping. |
225 | ||
226 | size_t | |
227 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
228 | { | |
f0641a0b | 229 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
230 | } |
231 | ||
02d2ba74 ILT |
232 | // Returns whether the given section is in the list of |
233 | // debug-sections-used-by-some-version-of-gdb. Currently, | |
234 | // we've checked versions of gdb up to and including 6.7.1. | |
235 | ||
236 | static const char* gdb_sections[] = | |
237 | { ".debug_abbrev", | |
238 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
239 | ".debug_frame", | |
240 | ".debug_info", | |
241 | ".debug_line", | |
242 | ".debug_loc", | |
243 | ".debug_macinfo", | |
244 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
245 | ".debug_ranges", | |
246 | ".debug_str", | |
247 | }; | |
248 | ||
62b01cb5 ILT |
249 | static const char* lines_only_debug_sections[] = |
250 | { ".debug_abbrev", | |
251 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
252 | // ".debug_frame", | |
253 | ".debug_info", | |
254 | ".debug_line", | |
255 | // ".debug_loc", | |
256 | // ".debug_macinfo", | |
257 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
258 | // ".debug_ranges", | |
259 | ".debug_str", | |
260 | }; | |
261 | ||
02d2ba74 ILT |
262 | static inline bool |
263 | is_gdb_debug_section(const char* str) | |
264 | { | |
265 | // We can do this faster: binary search or a hashtable. But why bother? | |
266 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) | |
267 | if (strcmp(str, gdb_sections[i]) == 0) | |
268 | return true; | |
269 | return false; | |
270 | } | |
271 | ||
62b01cb5 ILT |
272 | static inline bool |
273 | is_lines_only_debug_section(const char* str) | |
274 | { | |
275 | // We can do this faster: binary search or a hashtable. But why bother? | |
276 | for (size_t i = 0; | |
277 | i < sizeof(lines_only_debug_sections)/sizeof(*lines_only_debug_sections); | |
278 | ++i) | |
279 | if (strcmp(str, lines_only_debug_sections[i]) == 0) | |
280 | return true; | |
281 | return false; | |
282 | } | |
283 | ||
a2fb1b05 ILT |
284 | // Whether to include this section in the link. |
285 | ||
286 | template<int size, bool big_endian> | |
287 | bool | |
730cdc88 | 288 | Layout::include_section(Sized_relobj<size, big_endian>*, const char* name, |
a2fb1b05 ILT |
289 | const elfcpp::Shdr<size, big_endian>& shdr) |
290 | { | |
fd06b4aa CC |
291 | if (shdr.get_sh_flags() & elfcpp::SHF_EXCLUDE) |
292 | return false; | |
293 | ||
a2fb1b05 ILT |
294 | switch (shdr.get_sh_type()) |
295 | { | |
296 | case elfcpp::SHT_NULL: | |
297 | case elfcpp::SHT_SYMTAB: | |
298 | case elfcpp::SHT_DYNSYM: | |
a2fb1b05 ILT |
299 | case elfcpp::SHT_HASH: |
300 | case elfcpp::SHT_DYNAMIC: | |
301 | case elfcpp::SHT_SYMTAB_SHNDX: | |
302 | return false; | |
303 | ||
5cb66f97 ILT |
304 | case elfcpp::SHT_STRTAB: |
305 | // Discard the sections which have special meanings in the ELF | |
306 | // ABI. Keep others (e.g., .stabstr). We could also do this by | |
307 | // checking the sh_link fields of the appropriate sections. | |
308 | return (strcmp(name, ".dynstr") != 0 | |
309 | && strcmp(name, ".strtab") != 0 | |
310 | && strcmp(name, ".shstrtab") != 0); | |
311 | ||
a2fb1b05 ILT |
312 | case elfcpp::SHT_RELA: |
313 | case elfcpp::SHT_REL: | |
314 | case elfcpp::SHT_GROUP: | |
7019cd25 ILT |
315 | // If we are emitting relocations these should be handled |
316 | // elsewhere. | |
8851ecca ILT |
317 | gold_assert(!parameters->options().relocatable() |
318 | && !parameters->options().emit_relocs()); | |
6a74a719 | 319 | return false; |
a2fb1b05 | 320 | |
9e2dcb77 | 321 | case elfcpp::SHT_PROGBITS: |
8851ecca | 322 | if (parameters->options().strip_debug() |
9e2dcb77 ILT |
323 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
324 | { | |
e94cf127 | 325 | if (is_debug_info_section(name)) |
9e2dcb77 ILT |
326 | return false; |
327 | } | |
62b01cb5 ILT |
328 | if (parameters->options().strip_debug_non_line() |
329 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
330 | { | |
331 | // Debugging sections can only be recognized by name. | |
332 | if (is_prefix_of(".debug", name) | |
333 | && !is_lines_only_debug_section(name)) | |
334 | return false; | |
335 | } | |
8851ecca | 336 | if (parameters->options().strip_debug_gdb() |
02d2ba74 ILT |
337 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
338 | { | |
339 | // Debugging sections can only be recognized by name. | |
340 | if (is_prefix_of(".debug", name) | |
341 | && !is_gdb_debug_section(name)) | |
342 | return false; | |
343 | } | |
fd06b4aa CC |
344 | if (parameters->options().strip_lto_sections() |
345 | && !parameters->options().relocatable() | |
346 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
347 | { | |
348 | // Ignore LTO sections containing intermediate code. | |
349 | if (is_prefix_of(".gnu.lto_", name)) | |
350 | return false; | |
351 | } | |
9e2dcb77 ILT |
352 | return true; |
353 | ||
a2fb1b05 | 354 | default: |
a2fb1b05 ILT |
355 | return true; |
356 | } | |
357 | } | |
358 | ||
ead1e424 | 359 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 360 | |
a2fb1b05 | 361 | Output_section* |
ead1e424 | 362 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 363 | { |
a445fddf ILT |
364 | for (Section_list::const_iterator p = this->section_list_.begin(); |
365 | p != this->section_list_.end(); | |
ead1e424 | 366 | ++p) |
a445fddf ILT |
367 | if (strcmp((*p)->name(), name) == 0) |
368 | return *p; | |
ead1e424 ILT |
369 | return NULL; |
370 | } | |
a2fb1b05 | 371 | |
ead1e424 ILT |
372 | // Return an output segment of type TYPE, with segment flags SET set |
373 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 374 | |
ead1e424 ILT |
375 | Output_segment* |
376 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
377 | elfcpp::Elf_Word clear) const | |
378 | { | |
379 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
380 | p != this->segment_list_.end(); | |
381 | ++p) | |
382 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
383 | && ((*p)->flags() & set) == set | |
384 | && ((*p)->flags() & clear) == 0) | |
385 | return *p; | |
386 | return NULL; | |
387 | } | |
a2fb1b05 | 388 | |
ead1e424 | 389 | // Return the output section to use for section NAME with type TYPE |
a445fddf ILT |
390 | // and section flags FLAGS. NAME must be canonicalized in the string |
391 | // pool, and NAME_KEY is the key. | |
a2fb1b05 | 392 | |
ead1e424 | 393 | Output_section* |
f0641a0b ILT |
394 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
395 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags) | |
ead1e424 | 396 | { |
154e0e9a ILT |
397 | elfcpp::Elf_Xword lookup_flags = flags; |
398 | ||
399 | // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine | |
400 | // read-write with read-only sections. Some other ELF linkers do | |
401 | // not do this. FIXME: Perhaps there should be an option | |
402 | // controlling this. | |
403 | lookup_flags &= ~(elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
404 | ||
405 | const Key key(name_key, std::make_pair(type, lookup_flags)); | |
a2fb1b05 ILT |
406 | const std::pair<Key, Output_section*> v(key, NULL); |
407 | std::pair<Section_name_map::iterator, bool> ins( | |
408 | this->section_name_map_.insert(v)); | |
409 | ||
a2fb1b05 | 410 | if (!ins.second) |
ead1e424 | 411 | return ins.first->second; |
a2fb1b05 ILT |
412 | else |
413 | { | |
414 | // This is the first time we've seen this name/type/flags | |
4e2b1697 ILT |
415 | // combination. For compatibility with the GNU linker, we |
416 | // combine sections with contents and zero flags with sections | |
417 | // with non-zero flags. This is a workaround for cases where | |
418 | // assembler code forgets to set section flags. FIXME: Perhaps | |
419 | // there should be an option to control this. | |
15cf077e | 420 | Output_section* os = NULL; |
4e2b1697 ILT |
421 | |
422 | if (type == elfcpp::SHT_PROGBITS) | |
15cf077e | 423 | { |
4e2b1697 ILT |
424 | if (flags == 0) |
425 | { | |
426 | Output_section* same_name = this->find_output_section(name); | |
427 | if (same_name != NULL | |
428 | && same_name->type() == elfcpp::SHT_PROGBITS | |
429 | && (same_name->flags() & elfcpp::SHF_TLS) == 0) | |
430 | os = same_name; | |
431 | } | |
432 | else if ((flags & elfcpp::SHF_TLS) == 0) | |
433 | { | |
434 | elfcpp::Elf_Xword zero_flags = 0; | |
435 | const Key zero_key(name_key, std::make_pair(type, zero_flags)); | |
436 | Section_name_map::iterator p = | |
437 | this->section_name_map_.find(zero_key); | |
438 | if (p != this->section_name_map_.end()) | |
154e0e9a | 439 | os = p->second; |
4e2b1697 | 440 | } |
15cf077e | 441 | } |
4e2b1697 | 442 | |
15cf077e ILT |
443 | if (os == NULL) |
444 | os = this->make_output_section(name, type, flags); | |
a2fb1b05 | 445 | ins.first->second = os; |
ead1e424 | 446 | return os; |
a2fb1b05 | 447 | } |
ead1e424 ILT |
448 | } |
449 | ||
a445fddf ILT |
450 | // Pick the output section to use for section NAME, in input file |
451 | // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a | |
154e0e9a ILT |
452 | // linker created section. IS_INPUT_SECTION is true if we are |
453 | // choosing an output section for an input section found in a input | |
454 | // file. This will return NULL if the input section should be | |
455 | // discarded. | |
a445fddf ILT |
456 | |
457 | Output_section* | |
458 | Layout::choose_output_section(const Relobj* relobj, const char* name, | |
459 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
154e0e9a | 460 | bool is_input_section) |
a445fddf | 461 | { |
154e0e9a ILT |
462 | // We should not see any input sections after we have attached |
463 | // sections to segments. | |
464 | gold_assert(!is_input_section || !this->sections_are_attached_); | |
465 | ||
466 | // Some flags in the input section should not be automatically | |
467 | // copied to the output section. | |
a445fddf ILT |
468 | flags &= ~ (elfcpp::SHF_INFO_LINK |
469 | | elfcpp::SHF_LINK_ORDER | |
470 | | elfcpp::SHF_GROUP | |
471 | | elfcpp::SHF_MERGE | |
472 | | elfcpp::SHF_STRINGS); | |
473 | ||
474 | if (this->script_options_->saw_sections_clause()) | |
475 | { | |
476 | // We are using a SECTIONS clause, so the output section is | |
477 | // chosen based only on the name. | |
478 | ||
479 | Script_sections* ss = this->script_options_->script_sections(); | |
480 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
481 | Output_section** output_section_slot; | |
482 | name = ss->output_section_name(file_name, name, &output_section_slot); | |
483 | if (name == NULL) | |
484 | { | |
485 | // The SECTIONS clause says to discard this input section. | |
486 | return NULL; | |
487 | } | |
488 | ||
489 | // If this is an orphan section--one not mentioned in the linker | |
490 | // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the | |
491 | // default processing below. | |
492 | ||
493 | if (output_section_slot != NULL) | |
494 | { | |
495 | if (*output_section_slot != NULL) | |
9c547ec3 ILT |
496 | { |
497 | (*output_section_slot)->update_flags_for_input_section(flags); | |
498 | return *output_section_slot; | |
499 | } | |
a445fddf ILT |
500 | |
501 | // We don't put sections found in the linker script into | |
502 | // SECTION_NAME_MAP_. That keeps us from getting confused | |
503 | // if an orphan section is mapped to a section with the same | |
504 | // name as one in the linker script. | |
505 | ||
506 | name = this->namepool_.add(name, false, NULL); | |
507 | ||
508 | Output_section* os = this->make_output_section(name, type, flags); | |
509 | os->set_found_in_sections_clause(); | |
510 | *output_section_slot = os; | |
511 | return os; | |
512 | } | |
513 | } | |
514 | ||
515 | // FIXME: Handle SHF_OS_NONCONFORMING somewhere. | |
516 | ||
517 | // Turn NAME from the name of the input section into the name of the | |
518 | // output section. | |
519 | ||
520 | size_t len = strlen(name); | |
401a9a73 CC |
521 | if (is_input_section |
522 | && !this->script_options_->saw_sections_clause() | |
523 | && !parameters->options().relocatable()) | |
a445fddf ILT |
524 | name = Layout::output_section_name(name, &len); |
525 | ||
526 | Stringpool::Key name_key; | |
527 | name = this->namepool_.add_with_length(name, len, true, &name_key); | |
528 | ||
529 | // Find or make the output section. The output section is selected | |
530 | // based on the section name, type, and flags. | |
531 | return this->get_output_section(name, name_key, type, flags); | |
532 | } | |
533 | ||
ead1e424 | 534 | // Return the output section to use for input section SHNDX, with name |
730cdc88 ILT |
535 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
536 | // index of a relocation section which applies to this section, or 0 | |
537 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
538 | // relocation section if there is one. Set *OFF to the offset of this | |
539 | // input section without the output section. Return NULL if the | |
540 | // section should be discarded. Set *OFF to -1 if the section | |
541 | // contents should not be written directly to the output file, but | |
542 | // will instead receive special handling. | |
ead1e424 ILT |
543 | |
544 | template<int size, bool big_endian> | |
545 | Output_section* | |
730cdc88 ILT |
546 | Layout::layout(Sized_relobj<size, big_endian>* object, unsigned int shndx, |
547 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, | |
548 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 | 549 | { |
ef9beddf ILT |
550 | *off = 0; |
551 | ||
ead1e424 ILT |
552 | if (!this->include_section(object, name, shdr)) |
553 | return NULL; | |
554 | ||
6a74a719 ILT |
555 | Output_section* os; |
556 | ||
557 | // In a relocatable link a grouped section must not be combined with | |
558 | // any other sections. | |
8851ecca | 559 | if (parameters->options().relocatable() |
6a74a719 ILT |
560 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
561 | { | |
562 | name = this->namepool_.add(name, true, NULL); | |
563 | os = this->make_output_section(name, shdr.get_sh_type(), | |
564 | shdr.get_sh_flags()); | |
565 | } | |
566 | else | |
567 | { | |
568 | os = this->choose_output_section(object, name, shdr.get_sh_type(), | |
569 | shdr.get_sh_flags(), true); | |
570 | if (os == NULL) | |
571 | return NULL; | |
572 | } | |
a2fb1b05 | 573 | |
2fd32231 ILT |
574 | // By default the GNU linker sorts input sections whose names match |
575 | // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*. The sections | |
576 | // are sorted by name. This is used to implement constructor | |
577 | // priority ordering. We are compatible. | |
578 | if (!this->script_options_->saw_sections_clause() | |
579 | && (is_prefix_of(".ctors.", name) | |
580 | || is_prefix_of(".dtors.", name) | |
581 | || is_prefix_of(".init_array.", name) | |
582 | || is_prefix_of(".fini_array.", name))) | |
583 | os->set_must_sort_attached_input_sections(); | |
584 | ||
a2fb1b05 ILT |
585 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
586 | ||
a445fddf ILT |
587 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx, |
588 | this->script_options_->saw_sections_clause()); | |
a2fb1b05 ILT |
589 | |
590 | return os; | |
591 | } | |
592 | ||
6a74a719 ILT |
593 | // Handle a relocation section when doing a relocatable link. |
594 | ||
595 | template<int size, bool big_endian> | |
596 | Output_section* | |
597 | Layout::layout_reloc(Sized_relobj<size, big_endian>* object, | |
598 | unsigned int, | |
599 | const elfcpp::Shdr<size, big_endian>& shdr, | |
600 | Output_section* data_section, | |
601 | Relocatable_relocs* rr) | |
602 | { | |
8851ecca ILT |
603 | gold_assert(parameters->options().relocatable() |
604 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
605 | |
606 | int sh_type = shdr.get_sh_type(); | |
607 | ||
608 | std::string name; | |
609 | if (sh_type == elfcpp::SHT_REL) | |
610 | name = ".rel"; | |
611 | else if (sh_type == elfcpp::SHT_RELA) | |
612 | name = ".rela"; | |
613 | else | |
614 | gold_unreachable(); | |
615 | name += data_section->name(); | |
616 | ||
617 | Output_section* os = this->choose_output_section(object, name.c_str(), | |
618 | sh_type, | |
619 | shdr.get_sh_flags(), | |
620 | false); | |
621 | ||
622 | os->set_should_link_to_symtab(); | |
623 | os->set_info_section(data_section); | |
624 | ||
625 | Output_section_data* posd; | |
626 | if (sh_type == elfcpp::SHT_REL) | |
627 | { | |
628 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); | |
629 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, | |
630 | size, | |
631 | big_endian>(rr); | |
632 | } | |
633 | else if (sh_type == elfcpp::SHT_RELA) | |
634 | { | |
635 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); | |
636 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, | |
637 | size, | |
638 | big_endian>(rr); | |
639 | } | |
640 | else | |
641 | gold_unreachable(); | |
642 | ||
643 | os->add_output_section_data(posd); | |
644 | rr->set_output_data(posd); | |
645 | ||
646 | return os; | |
647 | } | |
648 | ||
649 | // Handle a group section when doing a relocatable link. | |
650 | ||
651 | template<int size, bool big_endian> | |
652 | void | |
653 | Layout::layout_group(Symbol_table* symtab, | |
654 | Sized_relobj<size, big_endian>* object, | |
655 | unsigned int, | |
656 | const char* group_section_name, | |
657 | const char* signature, | |
658 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
659 | elfcpp::Elf_Word flags, |
660 | std::vector<unsigned int>* shndxes) | |
6a74a719 | 661 | { |
8851ecca | 662 | gold_assert(parameters->options().relocatable()); |
6a74a719 ILT |
663 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
664 | group_section_name = this->namepool_.add(group_section_name, true, NULL); | |
665 | Output_section* os = this->make_output_section(group_section_name, | |
666 | elfcpp::SHT_GROUP, | |
667 | shdr.get_sh_flags()); | |
668 | ||
669 | // We need to find a symbol with the signature in the symbol table. | |
755ab8af | 670 | // If we don't find one now, we need to look again later. |
6a74a719 | 671 | Symbol* sym = symtab->lookup(signature, NULL); |
755ab8af ILT |
672 | if (sym != NULL) |
673 | os->set_info_symndx(sym); | |
674 | else | |
675 | { | |
e55bde5e ILT |
676 | // Reserve some space to minimize reallocations. |
677 | if (this->group_signatures_.empty()) | |
678 | this->group_signatures_.reserve(this->number_of_input_files_ * 16); | |
679 | ||
755ab8af ILT |
680 | // We will wind up using a symbol whose name is the signature. |
681 | // So just put the signature in the symbol name pool to save it. | |
682 | signature = symtab->canonicalize_name(signature); | |
683 | this->group_signatures_.push_back(Group_signature(os, signature)); | |
684 | } | |
6a74a719 ILT |
685 | |
686 | os->set_should_link_to_symtab(); | |
6a74a719 ILT |
687 | os->set_entsize(4); |
688 | ||
689 | section_size_type entry_count = | |
690 | convert_to_section_size_type(shdr.get_sh_size() / 4); | |
691 | Output_section_data* posd = | |
8825ac63 ILT |
692 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
693 | shndxes); | |
6a74a719 ILT |
694 | os->add_output_section_data(posd); |
695 | } | |
696 | ||
730cdc88 ILT |
697 | // Special GNU handling of sections name .eh_frame. They will |
698 | // normally hold exception frame data as defined by the C++ ABI | |
699 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
700 | |
701 | template<int size, bool big_endian> | |
730cdc88 ILT |
702 | Output_section* |
703 | Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object, | |
704 | const unsigned char* symbols, | |
705 | off_t symbols_size, | |
706 | const unsigned char* symbol_names, | |
707 | off_t symbol_names_size, | |
3151305a | 708 | unsigned int shndx, |
3151305a | 709 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
710 | unsigned int reloc_shndx, unsigned int reloc_type, |
711 | off_t* off) | |
3151305a | 712 | { |
730cdc88 | 713 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS); |
1650c4ff | 714 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 | 715 | |
a445fddf ILT |
716 | const char* const name = ".eh_frame"; |
717 | Output_section* os = this->choose_output_section(object, | |
718 | name, | |
719 | elfcpp::SHT_PROGBITS, | |
720 | elfcpp::SHF_ALLOC, | |
721 | false); | |
722 | if (os == NULL) | |
723 | return NULL; | |
730cdc88 | 724 | |
3151305a ILT |
725 | if (this->eh_frame_section_ == NULL) |
726 | { | |
727 | this->eh_frame_section_ = os; | |
730cdc88 | 728 | this->eh_frame_data_ = new Eh_frame(); |
3151305a | 729 | |
e55bde5e | 730 | if (parameters->options().eh_frame_hdr()) |
3151305a | 731 | { |
3151305a | 732 | Output_section* hdr_os = |
a445fddf ILT |
733 | this->choose_output_section(NULL, |
734 | ".eh_frame_hdr", | |
735 | elfcpp::SHT_PROGBITS, | |
736 | elfcpp::SHF_ALLOC, | |
737 | false); | |
3151305a | 738 | |
a445fddf ILT |
739 | if (hdr_os != NULL) |
740 | { | |
741 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, | |
742 | this->eh_frame_data_); | |
743 | hdr_os->add_output_section_data(hdr_posd); | |
3151305a | 744 | |
a445fddf | 745 | hdr_os->set_after_input_sections(); |
730cdc88 | 746 | |
1c4f3631 ILT |
747 | if (!this->script_options_->saw_phdrs_clause()) |
748 | { | |
749 | Output_segment* hdr_oseg; | |
750 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, | |
751 | elfcpp::PF_R); | |
752 | hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R); | |
753 | } | |
730cdc88 | 754 | |
a445fddf ILT |
755 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); |
756 | } | |
3151305a ILT |
757 | } |
758 | } | |
759 | ||
760 | gold_assert(this->eh_frame_section_ == os); | |
761 | ||
730cdc88 ILT |
762 | if (this->eh_frame_data_->add_ehframe_input_section(object, |
763 | symbols, | |
764 | symbols_size, | |
765 | symbol_names, | |
766 | symbol_names_size, | |
767 | shndx, | |
768 | reloc_shndx, | |
769 | reloc_type)) | |
2c38906f | 770 | { |
154e0e9a ILT |
771 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
772 | ||
2c38906f ILT |
773 | // We found a .eh_frame section we are going to optimize, so now |
774 | // we can add the set of optimized sections to the output | |
775 | // section. We need to postpone adding this until we've found a | |
776 | // section we can optimize so that the .eh_frame section in | |
777 | // crtbegin.o winds up at the start of the output section. | |
778 | if (!this->added_eh_frame_data_) | |
779 | { | |
780 | os->add_output_section_data(this->eh_frame_data_); | |
781 | this->added_eh_frame_data_ = true; | |
782 | } | |
783 | *off = -1; | |
784 | } | |
730cdc88 ILT |
785 | else |
786 | { | |
787 | // We couldn't handle this .eh_frame section for some reason. | |
788 | // Add it as a normal section. | |
a445fddf ILT |
789 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); |
790 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx, | |
791 | saw_sections_clause); | |
730cdc88 ILT |
792 | } |
793 | ||
794 | return os; | |
3151305a ILT |
795 | } |
796 | ||
9f1d377b ILT |
797 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
798 | // the output section. | |
ead1e424 | 799 | |
9f1d377b | 800 | Output_section* |
ead1e424 ILT |
801 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
802 | elfcpp::Elf_Xword flags, | |
803 | Output_section_data* posd) | |
804 | { | |
a445fddf ILT |
805 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
806 | false); | |
807 | if (os != NULL) | |
808 | os->add_output_section_data(posd); | |
9f1d377b | 809 | return os; |
ead1e424 ILT |
810 | } |
811 | ||
a2fb1b05 ILT |
812 | // Map section flags to segment flags. |
813 | ||
814 | elfcpp::Elf_Word | |
815 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
816 | { | |
817 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
818 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
819 | ret |= elfcpp::PF_W; | |
820 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
821 | ret |= elfcpp::PF_X; | |
822 | return ret; | |
823 | } | |
824 | ||
96803768 ILT |
825 | // Sometimes we compress sections. This is typically done for |
826 | // sections that are not part of normal program execution (such as | |
827 | // .debug_* sections), and where the readers of these sections know | |
c3b65ac4 CD |
828 | // how to deal with compressed sections. This routine doesn't say for |
829 | // certain whether we'll compress -- it depends on commandline options | |
830 | // as well -- just whether this section is a candidate for compression. | |
831 | // (The Output_compressed_section class decides whether to compress | |
832 | // a given section, and picks the name of the compressed section.) | |
96803768 ILT |
833 | |
834 | static bool | |
835 | is_compressible_debug_section(const char* secname) | |
836 | { | |
837 | return (strncmp(secname, ".debug", sizeof(".debug") - 1) == 0); | |
838 | } | |
839 | ||
a2fb1b05 ILT |
840 | // Make a new Output_section, and attach it to segments as |
841 | // appropriate. | |
842 | ||
843 | Output_section* | |
844 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
845 | elfcpp::Elf_Xword flags) | |
846 | { | |
96803768 ILT |
847 | Output_section* os; |
848 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 849 | && strcmp(parameters->options().compress_debug_sections(), "none") != 0 |
96803768 | 850 | && is_compressible_debug_section(name)) |
e55bde5e ILT |
851 | os = new Output_compressed_section(¶meters->options(), name, type, |
852 | flags); | |
62b01cb5 ILT |
853 | |
854 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 855 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
856 | && strcmp(".debug_abbrev", name) == 0) |
857 | { | |
858 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( | |
859 | name, type, flags); | |
860 | if (this->debug_info_) | |
861 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
862 | } | |
863 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 864 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
865 | && strcmp(".debug_info", name) == 0) |
866 | { | |
867 | os = this->debug_info_ = new Output_reduced_debug_info_section( | |
868 | name, type, flags); | |
869 | if (this->debug_abbrev_) | |
870 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
871 | } | |
872 | else | |
c0a62865 DK |
873 | { |
874 | // FIXME: const_cast is ugly. | |
875 | Target* target = const_cast<Target*>(¶meters->target()); | |
876 | os = target->make_output_section(name, type, flags); | |
877 | } | |
96803768 | 878 | |
8a5e3e08 ILT |
879 | parameters->target().new_output_section(os); |
880 | ||
a3ad94ed | 881 | this->section_list_.push_back(os); |
a2fb1b05 | 882 | |
2fd32231 ILT |
883 | // The GNU linker by default sorts some sections by priority, so we |
884 | // do the same. We need to know that this might happen before we | |
885 | // attach any input sections. | |
886 | if (!this->script_options_->saw_sections_clause() | |
887 | && (strcmp(name, ".ctors") == 0 | |
888 | || strcmp(name, ".dtors") == 0 | |
889 | || strcmp(name, ".init_array") == 0 | |
890 | || strcmp(name, ".fini_array") == 0)) | |
891 | os->set_may_sort_attached_input_sections(); | |
892 | ||
9f1d377b ILT |
893 | // With -z relro, we have to recognize the special sections by name. |
894 | // There is no other way. | |
895 | if (!this->script_options_->saw_sections_clause() | |
896 | && parameters->options().relro() | |
897 | && type == elfcpp::SHT_PROGBITS | |
898 | && (flags & elfcpp::SHF_ALLOC) != 0 | |
899 | && (flags & elfcpp::SHF_WRITE) != 0) | |
900 | { | |
901 | if (strcmp(name, ".data.rel.ro") == 0) | |
902 | os->set_is_relro(); | |
903 | else if (strcmp(name, ".data.rel.ro.local") == 0) | |
904 | { | |
905 | os->set_is_relro(); | |
906 | os->set_is_relro_local(); | |
907 | } | |
908 | } | |
909 | ||
1518dc8f ILT |
910 | // Check for .stab*str sections, as .stab* sections need to link to |
911 | // them. | |
912 | if (type == elfcpp::SHT_STRTAB | |
913 | && !this->have_stabstr_section_ | |
914 | && strncmp(name, ".stab", 5) == 0 | |
915 | && strcmp(name + strlen(name) - 3, "str") == 0) | |
916 | this->have_stabstr_section_ = true; | |
917 | ||
154e0e9a ILT |
918 | // If we have already attached the sections to segments, then we |
919 | // need to attach this one now. This happens for sections created | |
920 | // directly by the linker. | |
921 | if (this->sections_are_attached_) | |
922 | this->attach_section_to_segment(os); | |
923 | ||
4e2b1697 ILT |
924 | return os; |
925 | } | |
a445fddf | 926 | |
154e0e9a ILT |
927 | // Attach output sections to segments. This is called after we have |
928 | // seen all the input sections. | |
929 | ||
930 | void | |
931 | Layout::attach_sections_to_segments() | |
932 | { | |
933 | for (Section_list::iterator p = this->section_list_.begin(); | |
934 | p != this->section_list_.end(); | |
935 | ++p) | |
936 | this->attach_section_to_segment(*p); | |
937 | ||
938 | this->sections_are_attached_ = true; | |
939 | } | |
940 | ||
941 | // Attach an output section to a segment. | |
942 | ||
943 | void | |
944 | Layout::attach_section_to_segment(Output_section* os) | |
945 | { | |
946 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
947 | this->unattached_section_list_.push_back(os); | |
948 | else | |
949 | this->attach_allocated_section_to_segment(os); | |
950 | } | |
951 | ||
4e2b1697 | 952 | // Attach an allocated output section to a segment. |
1c4f3631 | 953 | |
4e2b1697 | 954 | void |
154e0e9a | 955 | Layout::attach_allocated_section_to_segment(Output_section* os) |
4e2b1697 | 956 | { |
154e0e9a | 957 | elfcpp::Elf_Xword flags = os->flags(); |
4e2b1697 | 958 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
a2fb1b05 | 959 | |
4e2b1697 ILT |
960 | if (parameters->options().relocatable()) |
961 | return; | |
a2fb1b05 | 962 | |
4e2b1697 ILT |
963 | // If we have a SECTIONS clause, we can't handle the attachment to |
964 | // segments until after we've seen all the sections. | |
965 | if (this->script_options_->saw_sections_clause()) | |
966 | return; | |
a2fb1b05 | 967 | |
4e2b1697 | 968 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
756ac4a8 | 969 | |
4e2b1697 | 970 | // This output section goes into a PT_LOAD segment. |
a2fb1b05 | 971 | |
4e2b1697 | 972 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
a2fb1b05 | 973 | |
4e2b1697 ILT |
974 | // In general the only thing we really care about for PT_LOAD |
975 | // segments is whether or not they are writable, so that is how we | |
8a5e3e08 ILT |
976 | // search for them. Large data sections also go into their own |
977 | // PT_LOAD segment. People who need segments sorted on some other | |
4e2b1697 | 978 | // basis will have to use a linker script. |
a2fb1b05 | 979 | |
4e2b1697 ILT |
980 | Segment_list::const_iterator p; |
981 | for (p = this->segment_list_.begin(); | |
982 | p != this->segment_list_.end(); | |
983 | ++p) | |
984 | { | |
8a5e3e08 ILT |
985 | if ((*p)->type() != elfcpp::PT_LOAD) |
986 | continue; | |
987 | if (!parameters->options().omagic() | |
988 | && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W)) | |
989 | continue; | |
990 | // If -Tbss was specified, we need to separate the data and BSS | |
991 | // segments. | |
992 | if (parameters->options().user_set_Tbss()) | |
993 | { | |
994 | if ((os->type() == elfcpp::SHT_NOBITS) | |
995 | == (*p)->has_any_data_sections()) | |
996 | continue; | |
997 | } | |
998 | if (os->is_large_data_section() && !(*p)->is_large_data_segment()) | |
999 | continue; | |
4e2b1697 | 1000 | |
8a5e3e08 ILT |
1001 | (*p)->add_output_section(os, seg_flags); |
1002 | break; | |
4e2b1697 | 1003 | } |
54dc6425 | 1004 | |
4e2b1697 ILT |
1005 | if (p == this->segment_list_.end()) |
1006 | { | |
1007 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, | |
1008 | seg_flags); | |
8a5e3e08 ILT |
1009 | if (os->is_large_data_section()) |
1010 | oseg->set_is_large_data_segment(); | |
4e2b1697 | 1011 | oseg->add_output_section(os, seg_flags); |
a2fb1b05 ILT |
1012 | } |
1013 | ||
4e2b1697 ILT |
1014 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
1015 | // segment. | |
1016 | if (os->type() == elfcpp::SHT_NOTE) | |
1017 | { | |
1018 | // See if we already have an equivalent PT_NOTE segment. | |
1019 | for (p = this->segment_list_.begin(); | |
1020 | p != segment_list_.end(); | |
1021 | ++p) | |
1022 | { | |
1023 | if ((*p)->type() == elfcpp::PT_NOTE | |
1024 | && (((*p)->flags() & elfcpp::PF_W) | |
1025 | == (seg_flags & elfcpp::PF_W))) | |
1026 | { | |
1027 | (*p)->add_output_section(os, seg_flags); | |
1028 | break; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | if (p == this->segment_list_.end()) | |
1033 | { | |
1034 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, | |
1035 | seg_flags); | |
1036 | oseg->add_output_section(os, seg_flags); | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
1041 | // segment. There can only be one such segment. | |
1042 | if ((flags & elfcpp::SHF_TLS) != 0) | |
1043 | { | |
1044 | if (this->tls_segment_ == NULL) | |
2d924fd9 | 1045 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
4e2b1697 ILT |
1046 | this->tls_segment_->add_output_section(os, seg_flags); |
1047 | } | |
9f1d377b ILT |
1048 | |
1049 | // If -z relro is in effect, and we see a relro section, we create a | |
1050 | // PT_GNU_RELRO segment. There can only be one such segment. | |
1051 | if (os->is_relro() && parameters->options().relro()) | |
1052 | { | |
1053 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); | |
1054 | if (this->relro_segment_ == NULL) | |
2d924fd9 | 1055 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
9f1d377b ILT |
1056 | this->relro_segment_->add_output_section(os, seg_flags); |
1057 | } | |
a2fb1b05 ILT |
1058 | } |
1059 | ||
919ed24c ILT |
1060 | // Make an output section for a script. |
1061 | ||
1062 | Output_section* | |
1063 | Layout::make_output_section_for_script(const char* name) | |
1064 | { | |
1065 | name = this->namepool_.add(name, false, NULL); | |
1066 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, | |
1067 | elfcpp::SHF_ALLOC); | |
1068 | os->set_found_in_sections_clause(); | |
1069 | return os; | |
1070 | } | |
1071 | ||
3802b2dd ILT |
1072 | // Return the number of segments we expect to see. |
1073 | ||
1074 | size_t | |
1075 | Layout::expected_segment_count() const | |
1076 | { | |
1077 | size_t ret = this->segment_list_.size(); | |
1078 | ||
1079 | // If we didn't see a SECTIONS clause in a linker script, we should | |
1080 | // already have the complete list of segments. Otherwise we ask the | |
1081 | // SECTIONS clause how many segments it expects, and add in the ones | |
1082 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) | |
1083 | ||
1084 | if (!this->script_options_->saw_sections_clause()) | |
1085 | return ret; | |
1086 | else | |
1087 | { | |
1088 | const Script_sections* ss = this->script_options_->script_sections(); | |
1089 | return ret + ss->expected_segment_count(this); | |
1090 | } | |
1091 | } | |
1092 | ||
35cdfc9a ILT |
1093 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
1094 | // is whether we saw a .note.GNU-stack section in the object file. | |
1095 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
1096 | // protection required for stack memory. We record this in an | |
1097 | // executable as a PT_GNU_STACK segment. If an object file does not | |
1098 | // have a .note.GNU-stack segment, we must assume that it is an old | |
1099 | // object. On some targets that will force an executable stack. | |
1100 | ||
1101 | void | |
1102 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags) | |
1103 | { | |
1104 | if (!seen_gnu_stack) | |
1105 | this->input_without_gnu_stack_note_ = true; | |
1106 | else | |
1107 | { | |
1108 | this->input_with_gnu_stack_note_ = true; | |
1109 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
1110 | this->input_requires_executable_stack_ = true; | |
1111 | } | |
1112 | } | |
1113 | ||
9c547ec3 ILT |
1114 | // Create automatic note sections. |
1115 | ||
1116 | void | |
1117 | Layout::create_notes() | |
1118 | { | |
1119 | this->create_gold_note(); | |
1120 | this->create_executable_stack_info(); | |
1121 | this->create_build_id(); | |
1122 | } | |
1123 | ||
a3ad94ed ILT |
1124 | // Create the dynamic sections which are needed before we read the |
1125 | // relocs. | |
1126 | ||
1127 | void | |
9b07f471 | 1128 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
a3ad94ed | 1129 | { |
436ca963 | 1130 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
1131 | return; |
1132 | ||
3802b2dd ILT |
1133 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
1134 | elfcpp::SHT_DYNAMIC, | |
1135 | (elfcpp::SHF_ALLOC | |
1136 | | elfcpp::SHF_WRITE), | |
1137 | false); | |
9f1d377b | 1138 | this->dynamic_section_->set_is_relro(); |
a3ad94ed | 1139 | |
9b07f471 | 1140 | symtab->define_in_output_data("_DYNAMIC", NULL, this->dynamic_section_, 0, 0, |
a3ad94ed ILT |
1141 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, |
1142 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 1143 | |
9025d29d | 1144 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 ILT |
1145 | |
1146 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); | |
a3ad94ed ILT |
1147 | } |
1148 | ||
bfd58944 ILT |
1149 | // For each output section whose name can be represented as C symbol, |
1150 | // define __start and __stop symbols for the section. This is a GNU | |
1151 | // extension. | |
1152 | ||
1153 | void | |
9b07f471 | 1154 | Layout::define_section_symbols(Symbol_table* symtab) |
bfd58944 ILT |
1155 | { |
1156 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1157 | p != this->section_list_.end(); | |
1158 | ++p) | |
1159 | { | |
1160 | const char* const name = (*p)->name(); | |
1161 | if (name[strspn(name, | |
1162 | ("0123456789" | |
1163 | "ABCDEFGHIJKLMNOPWRSTUVWXYZ" | |
1164 | "abcdefghijklmnopqrstuvwxyz" | |
1165 | "_"))] | |
1166 | == '\0') | |
1167 | { | |
1168 | const std::string name_string(name); | |
1169 | const std::string start_name("__start_" + name_string); | |
1170 | const std::string stop_name("__stop_" + name_string); | |
1171 | ||
9b07f471 | 1172 | symtab->define_in_output_data(start_name.c_str(), |
bfd58944 ILT |
1173 | NULL, // version |
1174 | *p, | |
1175 | 0, // value | |
1176 | 0, // symsize | |
1177 | elfcpp::STT_NOTYPE, | |
1178 | elfcpp::STB_GLOBAL, | |
1179 | elfcpp::STV_DEFAULT, | |
1180 | 0, // nonvis | |
1181 | false, // offset_is_from_end | |
a445fddf | 1182 | true); // only_if_ref |
bfd58944 | 1183 | |
9b07f471 | 1184 | symtab->define_in_output_data(stop_name.c_str(), |
bfd58944 ILT |
1185 | NULL, // version |
1186 | *p, | |
1187 | 0, // value | |
1188 | 0, // symsize | |
1189 | elfcpp::STT_NOTYPE, | |
1190 | elfcpp::STB_GLOBAL, | |
1191 | elfcpp::STV_DEFAULT, | |
1192 | 0, // nonvis | |
1193 | true, // offset_is_from_end | |
a445fddf | 1194 | true); // only_if_ref |
bfd58944 ILT |
1195 | } |
1196 | } | |
1197 | } | |
1198 | ||
755ab8af ILT |
1199 | // Define symbols for group signatures. |
1200 | ||
1201 | void | |
1202 | Layout::define_group_signatures(Symbol_table* symtab) | |
1203 | { | |
1204 | for (Group_signatures::iterator p = this->group_signatures_.begin(); | |
1205 | p != this->group_signatures_.end(); | |
1206 | ++p) | |
1207 | { | |
1208 | Symbol* sym = symtab->lookup(p->signature, NULL); | |
1209 | if (sym != NULL) | |
1210 | p->section->set_info_symndx(sym); | |
1211 | else | |
1212 | { | |
1213 | // Force the name of the group section to the group | |
1214 | // signature, and use the group's section symbol as the | |
1215 | // signature symbol. | |
1216 | if (strcmp(p->section->name(), p->signature) != 0) | |
1217 | { | |
1218 | const char* name = this->namepool_.add(p->signature, | |
1219 | true, NULL); | |
1220 | p->section->set_name(name); | |
1221 | } | |
1222 | p->section->set_needs_symtab_index(); | |
1223 | p->section->set_info_section_symndx(p->section); | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | this->group_signatures_.clear(); | |
1228 | } | |
1229 | ||
75f65a3e ILT |
1230 | // Find the first read-only PT_LOAD segment, creating one if |
1231 | // necessary. | |
54dc6425 | 1232 | |
75f65a3e ILT |
1233 | Output_segment* |
1234 | Layout::find_first_load_seg() | |
54dc6425 | 1235 | { |
75f65a3e ILT |
1236 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
1237 | p != this->segment_list_.end(); | |
1238 | ++p) | |
1239 | { | |
1240 | if ((*p)->type() == elfcpp::PT_LOAD | |
1241 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
af6156ef ILT |
1242 | && (parameters->options().omagic() |
1243 | || ((*p)->flags() & elfcpp::PF_W) == 0)) | |
75f65a3e ILT |
1244 | return *p; |
1245 | } | |
1246 | ||
1c4f3631 ILT |
1247 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
1248 | ||
3802b2dd ILT |
1249 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
1250 | elfcpp::PF_R); | |
75f65a3e | 1251 | return load_seg; |
54dc6425 ILT |
1252 | } |
1253 | ||
20e6d0d6 DK |
1254 | // Save states of all current output segments. Store saved states |
1255 | // in SEGMENT_STATES. | |
1256 | ||
1257 | void | |
1258 | Layout::save_segments(Segment_states* segment_states) | |
1259 | { | |
1260 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
1261 | p != this->segment_list_.end(); | |
1262 | ++p) | |
1263 | { | |
1264 | Output_segment* segment = *p; | |
1265 | // Shallow copy. | |
1266 | Output_segment* copy = new Output_segment(*segment); | |
1267 | (*segment_states)[segment] = copy; | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | // Restore states of output segments and delete any segment not found in | |
1272 | // SEGMENT_STATES. | |
1273 | ||
1274 | void | |
1275 | Layout::restore_segments(const Segment_states* segment_states) | |
1276 | { | |
1277 | // Go through the segment list and remove any segment added in the | |
1278 | // relaxation loop. | |
1279 | this->tls_segment_ = NULL; | |
1280 | this->relro_segment_ = NULL; | |
1281 | Segment_list::iterator list_iter = this->segment_list_.begin(); | |
1282 | while (list_iter != this->segment_list_.end()) | |
1283 | { | |
1284 | Output_segment* segment = *list_iter; | |
1285 | Segment_states::const_iterator states_iter = | |
1286 | segment_states->find(segment); | |
1287 | if (states_iter != segment_states->end()) | |
1288 | { | |
1289 | const Output_segment* copy = states_iter->second; | |
1290 | // Shallow copy to restore states. | |
1291 | *segment = *copy; | |
1292 | ||
1293 | // Also fix up TLS and RELRO segment pointers as appropriate. | |
1294 | if (segment->type() == elfcpp::PT_TLS) | |
1295 | this->tls_segment_ = segment; | |
1296 | else if (segment->type() == elfcpp::PT_GNU_RELRO) | |
1297 | this->relro_segment_ = segment; | |
1298 | ||
1299 | ++list_iter; | |
1300 | } | |
1301 | else | |
1302 | { | |
1303 | list_iter = this->segment_list_.erase(list_iter); | |
1304 | // This is a segment created during section layout. It should be | |
1305 | // safe to remove it since we should have removed all pointers to it. | |
1306 | delete segment; | |
1307 | } | |
1308 | } | |
1309 | } | |
1310 | ||
1311 | // Clean up after relaxation so that sections can be laid out again. | |
1312 | ||
1313 | void | |
1314 | Layout::clean_up_after_relaxation() | |
1315 | { | |
1316 | // Restore the segments to point state just prior to the relaxation loop. | |
1317 | Script_sections* script_section = this->script_options_->script_sections(); | |
1318 | script_section->release_segments(); | |
1319 | this->restore_segments(this->segment_states_); | |
1320 | ||
1321 | // Reset section addresses and file offsets | |
1322 | for (Section_list::iterator p = this->section_list_.begin(); | |
1323 | p != this->section_list_.end(); | |
1324 | ++p) | |
1325 | { | |
1326 | (*p)->reset_address_and_file_offset(); | |
1327 | (*p)->restore_states(); | |
1328 | } | |
1329 | ||
1330 | // Reset special output object address and file offsets. | |
1331 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
1332 | p != this->special_output_list_.end(); | |
1333 | ++p) | |
1334 | (*p)->reset_address_and_file_offset(); | |
1335 | ||
1336 | // A linker script may have created some output section data objects. | |
1337 | // They are useless now. | |
1338 | for (Output_section_data_list::const_iterator p = | |
1339 | this->script_output_section_data_list_.begin(); | |
1340 | p != this->script_output_section_data_list_.end(); | |
1341 | ++p) | |
1342 | delete *p; | |
1343 | this->script_output_section_data_list_.clear(); | |
1344 | } | |
1345 | ||
1346 | // Prepare for relaxation. | |
1347 | ||
1348 | void | |
1349 | Layout::prepare_for_relaxation() | |
1350 | { | |
1351 | // Create an relaxation debug check if in debugging mode. | |
1352 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
1353 | this->relaxation_debug_check_ = new Relaxation_debug_check(); | |
1354 | ||
1355 | // Save segment states. | |
1356 | this->segment_states_ = new Segment_states(); | |
1357 | this->save_segments(this->segment_states_); | |
1358 | ||
1359 | for(Section_list::const_iterator p = this->section_list_.begin(); | |
1360 | p != this->section_list_.end(); | |
1361 | ++p) | |
1362 | (*p)->save_states(); | |
1363 | ||
1364 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
1365 | this->relaxation_debug_check_->check_output_data_for_reset_values( | |
1366 | this->section_list_, this->special_output_list_); | |
1367 | ||
1368 | // Also enable recording of output section data from scripts. | |
1369 | this->record_output_section_data_from_script_ = true; | |
1370 | } | |
1371 | ||
1372 | // Relaxation loop body: If target has no relaxation, this runs only once | |
1373 | // Otherwise, the target relaxation hook is called at the end of | |
1374 | // each iteration. If the hook returns true, it means re-layout of | |
1375 | // section is required. | |
1376 | // | |
1377 | // The number of segments created by a linking script without a PHDRS | |
1378 | // clause may be affected by section sizes and alignments. There is | |
1379 | // a remote chance that relaxation causes different number of PT_LOAD | |
1380 | // segments are created and sections are attached to different segments. | |
1381 | // Therefore, we always throw away all segments created during section | |
1382 | // layout. In order to be able to restart the section layout, we keep | |
1383 | // a copy of the segment list right before the relaxation loop and use | |
1384 | // that to restore the segments. | |
1385 | // | |
1386 | // PASS is the current relaxation pass number. | |
1387 | // SYMTAB is a symbol table. | |
1388 | // PLOAD_SEG is the address of a pointer for the load segment. | |
1389 | // PHDR_SEG is a pointer to the PHDR segment. | |
1390 | // SEGMENT_HEADERS points to the output segment header. | |
1391 | // FILE_HEADER points to the output file header. | |
1392 | // PSHNDX is the address to store the output section index. | |
1393 | ||
1394 | off_t inline | |
1395 | Layout::relaxation_loop_body( | |
1396 | int pass, | |
1397 | Target* target, | |
1398 | Symbol_table* symtab, | |
1399 | Output_segment** pload_seg, | |
1400 | Output_segment* phdr_seg, | |
1401 | Output_segment_headers* segment_headers, | |
1402 | Output_file_header* file_header, | |
1403 | unsigned int* pshndx) | |
1404 | { | |
1405 | // If this is not the first iteration, we need to clean up after | |
1406 | // relaxation so that we can lay out the sections again. | |
1407 | if (pass != 0) | |
1408 | this->clean_up_after_relaxation(); | |
1409 | ||
1410 | // If there is a SECTIONS clause, put all the input sections into | |
1411 | // the required order. | |
1412 | Output_segment* load_seg; | |
1413 | if (this->script_options_->saw_sections_clause()) | |
1414 | load_seg = this->set_section_addresses_from_script(symtab); | |
1415 | else if (parameters->options().relocatable()) | |
1416 | load_seg = NULL; | |
1417 | else | |
1418 | load_seg = this->find_first_load_seg(); | |
1419 | ||
1420 | if (parameters->options().oformat_enum() | |
1421 | != General_options::OBJECT_FORMAT_ELF) | |
1422 | load_seg = NULL; | |
1423 | ||
1424 | gold_assert(phdr_seg == NULL || load_seg != NULL); | |
1425 | ||
1426 | // Lay out the segment headers. | |
1427 | if (!parameters->options().relocatable()) | |
1428 | { | |
1429 | gold_assert(segment_headers != NULL); | |
1430 | if (load_seg != NULL) | |
1431 | load_seg->add_initial_output_data(segment_headers); | |
1432 | if (phdr_seg != NULL) | |
1433 | phdr_seg->add_initial_output_data(segment_headers); | |
1434 | } | |
1435 | ||
1436 | // Lay out the file header. | |
1437 | if (load_seg != NULL) | |
1438 | load_seg->add_initial_output_data(file_header); | |
1439 | ||
1440 | if (this->script_options_->saw_phdrs_clause() | |
1441 | && !parameters->options().relocatable()) | |
1442 | { | |
1443 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS | |
1444 | // clause in a linker script. | |
1445 | Script_sections* ss = this->script_options_->script_sections(); | |
1446 | ss->put_headers_in_phdrs(file_header, segment_headers); | |
1447 | } | |
1448 | ||
1449 | // We set the output section indexes in set_segment_offsets and | |
1450 | // set_section_indexes. | |
1451 | *pshndx = 1; | |
1452 | ||
1453 | // Set the file offsets of all the segments, and all the sections | |
1454 | // they contain. | |
1455 | off_t off; | |
1456 | if (!parameters->options().relocatable()) | |
1457 | off = this->set_segment_offsets(target, load_seg, pshndx); | |
1458 | else | |
1459 | off = this->set_relocatable_section_offsets(file_header, pshndx); | |
1460 | ||
1461 | // Verify that the dummy relaxation does not change anything. | |
1462 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
1463 | { | |
1464 | if (pass == 0) | |
1465 | this->relaxation_debug_check_->read_sections(this->section_list_); | |
1466 | else | |
1467 | this->relaxation_debug_check_->verify_sections(this->section_list_); | |
1468 | } | |
1469 | ||
1470 | *pload_seg = load_seg; | |
1471 | return off; | |
1472 | } | |
1473 | ||
54dc6425 ILT |
1474 | // Finalize the layout. When this is called, we have created all the |
1475 | // output sections and all the output segments which are based on | |
1476 | // input sections. We have several things to do, and we have to do | |
1477 | // them in the right order, so that we get the right results correctly | |
1478 | // and efficiently. | |
1479 | ||
1480 | // 1) Finalize the list of output segments and create the segment | |
1481 | // table header. | |
1482 | ||
1483 | // 2) Finalize the dynamic symbol table and associated sections. | |
1484 | ||
1485 | // 3) Determine the final file offset of all the output segments. | |
1486 | ||
1487 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
1488 | // sections. | |
1489 | ||
75f65a3e ILT |
1490 | // 5) Create the symbol table sections and the section name table |
1491 | // section. | |
1492 | ||
1493 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
1494 | // value and make a final determination of which symbols are going |
1495 | // into the output symbol table. | |
1496 | ||
54dc6425 ILT |
1497 | // 7) Create the section table header. |
1498 | ||
1499 | // 8) Determine the final file offset of all the output sections which | |
1500 | // are not SHF_ALLOC, including the section table header. | |
1501 | ||
1502 | // 9) Finalize the ELF file header. | |
1503 | ||
75f65a3e ILT |
1504 | // This function returns the size of the output file. |
1505 | ||
1506 | off_t | |
17a1d0a9 | 1507 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
8851ecca | 1508 | Target* target, const Task* task) |
54dc6425 | 1509 | { |
7e1edb90 | 1510 | target->finalize_sections(this); |
5a6f7e2d | 1511 | |
17a1d0a9 | 1512 | this->count_local_symbols(task, input_objects); |
7bf1f802 | 1513 | |
1518dc8f | 1514 | this->link_stabs_sections(); |
4f211c8b | 1515 | |
3802b2dd | 1516 | Output_segment* phdr_seg = NULL; |
8851ecca | 1517 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
54dc6425 | 1518 | { |
dbe717ef ILT |
1519 | // There was a dynamic object in the link. We need to create |
1520 | // some information for the dynamic linker. | |
1521 | ||
3802b2dd ILT |
1522 | // Create the PT_PHDR segment which will hold the program |
1523 | // headers. | |
1c4f3631 ILT |
1524 | if (!this->script_options_->saw_phdrs_clause()) |
1525 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
3802b2dd | 1526 | |
14b31740 ILT |
1527 | // Create the dynamic symbol table, including the hash table. |
1528 | Output_section* dynstr; | |
1529 | std::vector<Symbol*> dynamic_symbols; | |
1530 | unsigned int local_dynamic_count; | |
a5dc0706 ILT |
1531 | Versions versions(*this->script_options()->version_script_info(), |
1532 | &this->dynpool_); | |
9b07f471 | 1533 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
14b31740 ILT |
1534 | &local_dynamic_count, &dynamic_symbols, |
1535 | &versions); | |
dbe717ef ILT |
1536 | |
1537 | // Create the .interp section to hold the name of the | |
1538 | // interpreter, and put it in a PT_INTERP segment. | |
8851ecca | 1539 | if (!parameters->options().shared()) |
96f2030e | 1540 | this->create_interp(target); |
a3ad94ed ILT |
1541 | |
1542 | // Finish the .dynamic section to hold the dynamic data, and put | |
1543 | // it in a PT_DYNAMIC segment. | |
16649710 | 1544 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
1545 | |
1546 | // We should have added everything we need to the dynamic string | |
1547 | // table. | |
1548 | this->dynpool_.set_string_offsets(); | |
1549 | ||
1550 | // Create the version sections. We can't do this until the | |
1551 | // dynamic string table is complete. | |
46fe1623 | 1552 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
14b31740 | 1553 | dynamic_symbols, dynstr); |
54dc6425 | 1554 | } |
3ce2c28e ILT |
1555 | |
1556 | if (this->incremental_inputs_) | |
1557 | { | |
1558 | this->incremental_inputs_->finalize(); | |
1559 | this->create_incremental_info_sections(); | |
1560 | } | |
54dc6425 | 1561 | |
20e6d0d6 DK |
1562 | // Create segment headers. |
1563 | Output_segment_headers* segment_headers = | |
1564 | (parameters->options().relocatable() | |
1565 | ? NULL | |
1566 | : new Output_segment_headers(this->segment_list_)); | |
75f65a3e ILT |
1567 | |
1568 | // Lay out the file header. | |
20e6d0d6 DK |
1569 | Output_file_header* file_header |
1570 | = new Output_file_header(target, symtab, segment_headers, | |
1571 | parameters->options().entry()); | |
a445fddf | 1572 | |
61ba1cf9 | 1573 | this->special_output_list_.push_back(file_header); |
6a74a719 ILT |
1574 | if (segment_headers != NULL) |
1575 | this->special_output_list_.push_back(segment_headers); | |
75f65a3e | 1576 | |
20e6d0d6 DK |
1577 | // Find approriate places for orphan output sections if we are using |
1578 | // a linker script. | |
1579 | if (this->script_options_->saw_sections_clause()) | |
1580 | this->place_orphan_sections_in_script(); | |
1581 | ||
1582 | Output_segment* load_seg; | |
1583 | off_t off; | |
1584 | unsigned int shndx; | |
1585 | int pass = 0; | |
1586 | ||
1587 | // Take a snapshot of the section layout as needed. | |
1588 | if (target->may_relax()) | |
1589 | this->prepare_for_relaxation(); | |
1590 | ||
1591 | // Run the relaxation loop to lay out sections. | |
1592 | do | |
1c4f3631 | 1593 | { |
20e6d0d6 DK |
1594 | off = this->relaxation_loop_body(pass, target, symtab, &load_seg, |
1595 | phdr_seg, segment_headers, file_header, | |
1596 | &shndx); | |
1597 | pass++; | |
1c4f3631 | 1598 | } |
c0a62865 DK |
1599 | while (target->may_relax() |
1600 | && target->relax(pass, input_objects, symtab, this)); | |
75f65a3e | 1601 | |
a9a60db6 ILT |
1602 | // Set the file offsets of all the non-data sections we've seen so |
1603 | // far which don't have to wait for the input sections. We need | |
1604 | // this in order to finalize local symbols in non-allocated | |
1605 | // sections. | |
1606 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); | |
1607 | ||
d491d34e ILT |
1608 | // Set the section indexes of all unallocated sections seen so far, |
1609 | // in case any of them are somehow referenced by a symbol. | |
1610 | shndx = this->set_section_indexes(shndx); | |
1611 | ||
75f65a3e | 1612 | // Create the symbol table sections. |
d491d34e | 1613 | this->create_symtab_sections(input_objects, symtab, shndx, &off); |
7bf1f802 ILT |
1614 | if (!parameters->doing_static_link()) |
1615 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e | 1616 | |
e5756efb ILT |
1617 | // Process any symbol assignments from a linker script. This must |
1618 | // be called after the symbol table has been finalized. | |
1619 | this->script_options_->finalize_symbols(symtab, this); | |
1620 | ||
75f65a3e ILT |
1621 | // Create the .shstrtab section. |
1622 | Output_section* shstrtab_section = this->create_shstrtab(); | |
1623 | ||
a9a60db6 ILT |
1624 | // Set the file offsets of the rest of the non-data sections which |
1625 | // don't have to wait for the input sections. | |
9a0910c3 | 1626 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 | 1627 | |
d491d34e ILT |
1628 | // Now that all sections have been created, set the section indexes |
1629 | // for any sections which haven't been done yet. | |
86887060 | 1630 | shndx = this->set_section_indexes(shndx); |
ead1e424 | 1631 | |
75f65a3e | 1632 | // Create the section table header. |
d491d34e | 1633 | this->create_shdrs(shstrtab_section, &off); |
75f65a3e | 1634 | |
17a1d0a9 ILT |
1635 | // If there are no sections which require postprocessing, we can |
1636 | // handle the section names now, and avoid a resize later. | |
1637 | if (!this->any_postprocessing_sections_) | |
1638 | off = this->set_section_offsets(off, | |
1639 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
1640 | ||
27bc2bce | 1641 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 1642 | |
27bc2bce ILT |
1643 | // Now we know exactly where everything goes in the output file |
1644 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 1645 | Output_data::layout_complete(); |
75f65a3e | 1646 | |
e44fcf3b ILT |
1647 | this->output_file_size_ = off; |
1648 | ||
75f65a3e ILT |
1649 | return off; |
1650 | } | |
1651 | ||
8ed814a9 | 1652 | // Create a note header following the format defined in the ELF ABI. |
ec3f783e ILT |
1653 | // NAME is the name, NOTE_TYPE is the type, SECTION_NAME is the name |
1654 | // of the section to create, DESCSZ is the size of the descriptor. | |
1655 | // ALLOCATE is true if the section should be allocated in memory. | |
1656 | // This returns the new note section. It sets *TRAILING_PADDING to | |
1657 | // the number of trailing zero bytes required. | |
4f211c8b | 1658 | |
8ed814a9 | 1659 | Output_section* |
ef4ab7a8 PP |
1660 | Layout::create_note(const char* name, int note_type, |
1661 | const char* section_name, size_t descsz, | |
8ed814a9 | 1662 | bool allocate, size_t* trailing_padding) |
4f211c8b | 1663 | { |
e2305dc0 ILT |
1664 | // Authorities all agree that the values in a .note field should |
1665 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
1666 | // they differ on what the alignment is for 64-bit binaries. | |
1667 | // The GABI says unambiguously they take 8-byte alignment: | |
1668 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
1669 | // Other documentation says alignment should always be 4 bytes: | |
1670 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
1671 | // GNU ld and GNU readelf both support the latter (at least as of | |
1672 | // version 2.16.91), and glibc always generates the latter for | |
1673 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
1674 | // here. | |
35cdfc9a | 1675 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
8851ecca | 1676 | const int size = parameters->target().get_size(); |
e2305dc0 ILT |
1677 | #else |
1678 | const int size = 32; | |
1679 | #endif | |
4f211c8b ILT |
1680 | |
1681 | // The contents of the .note section. | |
4f211c8b ILT |
1682 | size_t namesz = strlen(name) + 1; |
1683 | size_t aligned_namesz = align_address(namesz, size / 8); | |
4f211c8b | 1684 | size_t aligned_descsz = align_address(descsz, size / 8); |
4f211c8b | 1685 | |
8ed814a9 | 1686 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
4f211c8b | 1687 | |
8ed814a9 ILT |
1688 | unsigned char* buffer = new unsigned char[notehdrsz]; |
1689 | memset(buffer, 0, notehdrsz); | |
4f211c8b | 1690 | |
8851ecca | 1691 | bool is_big_endian = parameters->target().is_big_endian(); |
4f211c8b ILT |
1692 | |
1693 | if (size == 32) | |
1694 | { | |
1695 | if (!is_big_endian) | |
1696 | { | |
1697 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
1698 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
1699 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
1700 | } | |
1701 | else | |
1702 | { | |
1703 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
1704 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
1705 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
1706 | } | |
1707 | } | |
1708 | else if (size == 64) | |
1709 | { | |
1710 | if (!is_big_endian) | |
1711 | { | |
1712 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
1713 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
1714 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
1715 | } | |
1716 | else | |
1717 | { | |
1718 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
1719 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
1720 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
1721 | } | |
1722 | } | |
1723 | else | |
1724 | gold_unreachable(); | |
1725 | ||
1726 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
4f211c8b | 1727 | |
8ed814a9 ILT |
1728 | elfcpp::Elf_Xword flags = 0; |
1729 | if (allocate) | |
1730 | flags = elfcpp::SHF_ALLOC; | |
ec3f783e ILT |
1731 | Output_section* os = this->choose_output_section(NULL, section_name, |
1732 | elfcpp::SHT_NOTE, | |
1733 | flags, false); | |
9c547ec3 ILT |
1734 | if (os == NULL) |
1735 | return NULL; | |
1736 | ||
8ed814a9 | 1737 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, |
7d9e3d98 ILT |
1738 | size / 8, |
1739 | "** note header"); | |
8ed814a9 ILT |
1740 | os->add_output_section_data(posd); |
1741 | ||
1742 | *trailing_padding = aligned_descsz - descsz; | |
1743 | ||
1744 | return os; | |
1745 | } | |
1746 | ||
1747 | // For an executable or shared library, create a note to record the | |
1748 | // version of gold used to create the binary. | |
1749 | ||
1750 | void | |
1751 | Layout::create_gold_note() | |
1752 | { | |
1753 | if (parameters->options().relocatable()) | |
1754 | return; | |
1755 | ||
1756 | std::string desc = std::string("gold ") + gold::get_version_string(); | |
1757 | ||
1758 | size_t trailing_padding; | |
1759 | Output_section *os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, | |
ef4ab7a8 PP |
1760 | ".note.gnu.gold-version", desc.size(), |
1761 | false, &trailing_padding); | |
9c547ec3 ILT |
1762 | if (os == NULL) |
1763 | return; | |
8ed814a9 ILT |
1764 | |
1765 | Output_section_data* posd = new Output_data_const(desc, 4); | |
4f211c8b | 1766 | os->add_output_section_data(posd); |
8ed814a9 ILT |
1767 | |
1768 | if (trailing_padding > 0) | |
1769 | { | |
7d9e3d98 | 1770 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
1771 | os->add_output_section_data(posd); |
1772 | } | |
4f211c8b ILT |
1773 | } |
1774 | ||
35cdfc9a ILT |
1775 | // Record whether the stack should be executable. This can be set |
1776 | // from the command line using the -z execstack or -z noexecstack | |
1777 | // options. Otherwise, if any input file has a .note.GNU-stack | |
1778 | // section with the SHF_EXECINSTR flag set, the stack should be | |
1779 | // executable. Otherwise, if at least one input file a | |
1780 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
1781 | // section, we use the target default for whether the stack should be | |
1782 | // executable. Otherwise, we don't generate a stack note. When | |
1783 | // generating a object file, we create a .note.GNU-stack section with | |
1784 | // the appropriate marking. When generating an executable or shared | |
1785 | // library, we create a PT_GNU_STACK segment. | |
1786 | ||
1787 | void | |
9c547ec3 | 1788 | Layout::create_executable_stack_info() |
35cdfc9a ILT |
1789 | { |
1790 | bool is_stack_executable; | |
e55bde5e ILT |
1791 | if (parameters->options().is_execstack_set()) |
1792 | is_stack_executable = parameters->options().is_stack_executable(); | |
35cdfc9a ILT |
1793 | else if (!this->input_with_gnu_stack_note_) |
1794 | return; | |
1795 | else | |
1796 | { | |
1797 | if (this->input_requires_executable_stack_) | |
1798 | is_stack_executable = true; | |
1799 | else if (this->input_without_gnu_stack_note_) | |
9c547ec3 ILT |
1800 | is_stack_executable = |
1801 | parameters->target().is_default_stack_executable(); | |
35cdfc9a ILT |
1802 | else |
1803 | is_stack_executable = false; | |
1804 | } | |
1805 | ||
8851ecca | 1806 | if (parameters->options().relocatable()) |
35cdfc9a ILT |
1807 | { |
1808 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
1809 | elfcpp::Elf_Xword flags = 0; | |
1810 | if (is_stack_executable) | |
1811 | flags |= elfcpp::SHF_EXECINSTR; | |
1812 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags); | |
1813 | } | |
1814 | else | |
1815 | { | |
1c4f3631 ILT |
1816 | if (this->script_options_->saw_phdrs_clause()) |
1817 | return; | |
35cdfc9a ILT |
1818 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
1819 | if (is_stack_executable) | |
1820 | flags |= elfcpp::PF_X; | |
3802b2dd | 1821 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); |
35cdfc9a ILT |
1822 | } |
1823 | } | |
1824 | ||
8ed814a9 ILT |
1825 | // If --build-id was used, set up the build ID note. |
1826 | ||
1827 | void | |
1828 | Layout::create_build_id() | |
1829 | { | |
1830 | if (!parameters->options().user_set_build_id()) | |
1831 | return; | |
1832 | ||
1833 | const char* style = parameters->options().build_id(); | |
1834 | if (strcmp(style, "none") == 0) | |
1835 | return; | |
1836 | ||
1837 | // Set DESCSZ to the size of the note descriptor. When possible, | |
1838 | // set DESC to the note descriptor contents. | |
1839 | size_t descsz; | |
1840 | std::string desc; | |
1841 | if (strcmp(style, "md5") == 0) | |
1842 | descsz = 128 / 8; | |
1843 | else if (strcmp(style, "sha1") == 0) | |
1844 | descsz = 160 / 8; | |
1845 | else if (strcmp(style, "uuid") == 0) | |
1846 | { | |
1847 | const size_t uuidsz = 128 / 8; | |
1848 | ||
1849 | char buffer[uuidsz]; | |
1850 | memset(buffer, 0, uuidsz); | |
1851 | ||
2a00e4fb | 1852 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
8ed814a9 ILT |
1853 | if (descriptor < 0) |
1854 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), | |
1855 | strerror(errno)); | |
1856 | else | |
1857 | { | |
1858 | ssize_t got = ::read(descriptor, buffer, uuidsz); | |
2a00e4fb | 1859 | release_descriptor(descriptor, true); |
8ed814a9 ILT |
1860 | if (got < 0) |
1861 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); | |
1862 | else if (static_cast<size_t>(got) != uuidsz) | |
1863 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), | |
1864 | uuidsz, got); | |
1865 | } | |
1866 | ||
1867 | desc.assign(buffer, uuidsz); | |
1868 | descsz = uuidsz; | |
1869 | } | |
1870 | else if (strncmp(style, "0x", 2) == 0) | |
1871 | { | |
1872 | hex_init(); | |
1873 | const char* p = style + 2; | |
1874 | while (*p != '\0') | |
1875 | { | |
1876 | if (hex_p(p[0]) && hex_p(p[1])) | |
1877 | { | |
1878 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); | |
1879 | desc += c; | |
1880 | p += 2; | |
1881 | } | |
1882 | else if (*p == '-' || *p == ':') | |
1883 | ++p; | |
1884 | else | |
1885 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), | |
1886 | style); | |
1887 | } | |
1888 | descsz = desc.size(); | |
1889 | } | |
1890 | else | |
1891 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); | |
1892 | ||
1893 | // Create the note. | |
1894 | size_t trailing_padding; | |
1895 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, | |
ef4ab7a8 PP |
1896 | ".note.gnu.build-id", descsz, true, |
1897 | &trailing_padding); | |
9c547ec3 ILT |
1898 | if (os == NULL) |
1899 | return; | |
8ed814a9 ILT |
1900 | |
1901 | if (!desc.empty()) | |
1902 | { | |
1903 | // We know the value already, so we fill it in now. | |
1904 | gold_assert(desc.size() == descsz); | |
1905 | ||
1906 | Output_section_data* posd = new Output_data_const(desc, 4); | |
1907 | os->add_output_section_data(posd); | |
1908 | ||
1909 | if (trailing_padding != 0) | |
1910 | { | |
7d9e3d98 | 1911 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
1912 | os->add_output_section_data(posd); |
1913 | } | |
1914 | } | |
1915 | else | |
1916 | { | |
1917 | // We need to compute a checksum after we have completed the | |
1918 | // link. | |
1919 | gold_assert(trailing_padding == 0); | |
7d9e3d98 | 1920 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
8ed814a9 | 1921 | os->add_output_section_data(this->build_id_note_); |
8ed814a9 ILT |
1922 | } |
1923 | } | |
1924 | ||
1518dc8f ILT |
1925 | // If we have both .stabXX and .stabXXstr sections, then the sh_link |
1926 | // field of the former should point to the latter. I'm not sure who | |
1927 | // started this, but the GNU linker does it, and some tools depend | |
1928 | // upon it. | |
1929 | ||
1930 | void | |
1931 | Layout::link_stabs_sections() | |
1932 | { | |
1933 | if (!this->have_stabstr_section_) | |
1934 | return; | |
1935 | ||
1936 | for (Section_list::iterator p = this->section_list_.begin(); | |
1937 | p != this->section_list_.end(); | |
1938 | ++p) | |
1939 | { | |
1940 | if ((*p)->type() != elfcpp::SHT_STRTAB) | |
1941 | continue; | |
1942 | ||
1943 | const char* name = (*p)->name(); | |
1944 | if (strncmp(name, ".stab", 5) != 0) | |
1945 | continue; | |
1946 | ||
1947 | size_t len = strlen(name); | |
1948 | if (strcmp(name + len - 3, "str") != 0) | |
1949 | continue; | |
1950 | ||
1951 | std::string stab_name(name, len - 3); | |
1952 | Output_section* stab_sec; | |
1953 | stab_sec = this->find_output_section(stab_name.c_str()); | |
1954 | if (stab_sec != NULL) | |
1955 | stab_sec->set_link_section(*p); | |
1956 | } | |
1957 | } | |
1958 | ||
3ce2c28e ILT |
1959 | // Create .gnu_incremental_inputs and .gnu_incremental_strtab sections needed |
1960 | // for the next run of incremental linking to check what has changed. | |
1961 | ||
1962 | void | |
1963 | Layout::create_incremental_info_sections() | |
1964 | { | |
1965 | gold_assert(this->incremental_inputs_ != NULL); | |
1966 | ||
1967 | // Add the .gnu_incremental_inputs section. | |
1968 | const char *incremental_inputs_name = | |
1969 | this->namepool_.add(".gnu_incremental_inputs", false, NULL); | |
1970 | Output_section* inputs_os = | |
1971 | this->make_output_section(incremental_inputs_name, | |
1972 | elfcpp::SHT_GNU_INCREMENTAL_INPUTS, 0); | |
1973 | Output_section_data* posd = | |
1974 | this->incremental_inputs_->create_incremental_inputs_section_data(); | |
1975 | inputs_os->add_output_section_data(posd); | |
1976 | ||
1977 | // Add the .gnu_incremental_strtab section. | |
1978 | const char *incremental_strtab_name = | |
1979 | this->namepool_.add(".gnu_incremental_strtab", false, NULL); | |
1980 | Output_section* strtab_os = this->make_output_section(incremental_strtab_name, | |
1981 | elfcpp::SHT_STRTAB, | |
1982 | 0); | |
1983 | Output_data_strtab* strtab_data = | |
1984 | new Output_data_strtab(this->incremental_inputs_->get_stringpool()); | |
1985 | strtab_os->add_output_section_data(strtab_data); | |
1986 | ||
1987 | inputs_os->set_link_section(strtab_data); | |
1988 | } | |
1989 | ||
75f65a3e ILT |
1990 | // Return whether SEG1 should be before SEG2 in the output file. This |
1991 | // is based entirely on the segment type and flags. When this is | |
1992 | // called the segment addresses has normally not yet been set. | |
1993 | ||
1994 | bool | |
1995 | Layout::segment_precedes(const Output_segment* seg1, | |
1996 | const Output_segment* seg2) | |
1997 | { | |
1998 | elfcpp::Elf_Word type1 = seg1->type(); | |
1999 | elfcpp::Elf_Word type2 = seg2->type(); | |
2000 | ||
2001 | // The single PT_PHDR segment is required to precede any loadable | |
2002 | // segment. We simply make it always first. | |
2003 | if (type1 == elfcpp::PT_PHDR) | |
2004 | { | |
a3ad94ed | 2005 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
2006 | return true; |
2007 | } | |
2008 | if (type2 == elfcpp::PT_PHDR) | |
2009 | return false; | |
2010 | ||
2011 | // The single PT_INTERP segment is required to precede any loadable | |
2012 | // segment. We simply make it always second. | |
2013 | if (type1 == elfcpp::PT_INTERP) | |
2014 | { | |
a3ad94ed | 2015 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
2016 | return true; |
2017 | } | |
2018 | if (type2 == elfcpp::PT_INTERP) | |
2019 | return false; | |
2020 | ||
2021 | // We then put PT_LOAD segments before any other segments. | |
2022 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
2023 | return true; | |
2024 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
2025 | return false; | |
2026 | ||
9f1d377b ILT |
2027 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
2028 | // segment, because that is where the dynamic linker expects to find | |
2029 | // it (this is just for efficiency; other positions would also work | |
2030 | // correctly). | |
2031 | if (type1 == elfcpp::PT_TLS | |
2032 | && type2 != elfcpp::PT_TLS | |
2033 | && type2 != elfcpp::PT_GNU_RELRO) | |
2034 | return false; | |
2035 | if (type2 == elfcpp::PT_TLS | |
2036 | && type1 != elfcpp::PT_TLS | |
2037 | && type1 != elfcpp::PT_GNU_RELRO) | |
2038 | return true; | |
2039 | ||
2040 | // We put the PT_GNU_RELRO segment last, because that is where the | |
2041 | // dynamic linker expects to find it (as with PT_TLS, this is just | |
2042 | // for efficiency). | |
2043 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) | |
92e059d8 | 2044 | return false; |
9f1d377b | 2045 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
92e059d8 ILT |
2046 | return true; |
2047 | ||
75f65a3e ILT |
2048 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
2049 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
2050 | ||
2051 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
2052 | // by the numeric segment type and flags values. There should not | |
2053 | // be more than one segment with the same type and flags. | |
2054 | if (type1 != elfcpp::PT_LOAD) | |
2055 | { | |
2056 | if (type1 != type2) | |
2057 | return type1 < type2; | |
a3ad94ed | 2058 | gold_assert(flags1 != flags2); |
75f65a3e ILT |
2059 | return flags1 < flags2; |
2060 | } | |
2061 | ||
a445fddf ILT |
2062 | // If the addresses are set already, sort by load address. |
2063 | if (seg1->are_addresses_set()) | |
2064 | { | |
2065 | if (!seg2->are_addresses_set()) | |
2066 | return true; | |
2067 | ||
2068 | unsigned int section_count1 = seg1->output_section_count(); | |
2069 | unsigned int section_count2 = seg2->output_section_count(); | |
2070 | if (section_count1 == 0 && section_count2 > 0) | |
2071 | return true; | |
2072 | if (section_count1 > 0 && section_count2 == 0) | |
2073 | return false; | |
2074 | ||
2075 | uint64_t paddr1 = seg1->first_section_load_address(); | |
2076 | uint64_t paddr2 = seg2->first_section_load_address(); | |
2077 | if (paddr1 != paddr2) | |
2078 | return paddr1 < paddr2; | |
2079 | } | |
2080 | else if (seg2->are_addresses_set()) | |
2081 | return false; | |
2082 | ||
8a5e3e08 ILT |
2083 | // A segment which holds large data comes after a segment which does |
2084 | // not hold large data. | |
2085 | if (seg1->is_large_data_segment()) | |
2086 | { | |
2087 | if (!seg2->is_large_data_segment()) | |
2088 | return false; | |
2089 | } | |
2090 | else if (seg2->is_large_data_segment()) | |
2091 | return true; | |
2092 | ||
2093 | // Otherwise, we sort PT_LOAD segments based on the flags. Readonly | |
2094 | // segments come before writable segments. Then writable segments | |
2095 | // with data come before writable segments without data. Then | |
2096 | // executable segments come before non-executable segments. Then | |
2097 | // the unlikely case of a non-readable segment comes before the | |
2098 | // normal case of a readable segment. If there are multiple | |
2099 | // segments with the same type and flags, we require that the | |
2100 | // address be set, and we sort by virtual address and then physical | |
2101 | // address. | |
75f65a3e ILT |
2102 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
2103 | return (flags1 & elfcpp::PF_W) == 0; | |
756ac4a8 ILT |
2104 | if ((flags1 & elfcpp::PF_W) != 0 |
2105 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) | |
2106 | return seg1->has_any_data_sections(); | |
75f65a3e ILT |
2107 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
2108 | return (flags1 & elfcpp::PF_X) != 0; | |
2109 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
2110 | return (flags1 & elfcpp::PF_R) == 0; | |
2111 | ||
a445fddf ILT |
2112 | // We shouldn't get here--we shouldn't create segments which we |
2113 | // can't distinguish. | |
2114 | gold_unreachable(); | |
75f65a3e ILT |
2115 | } |
2116 | ||
8a5e3e08 ILT |
2117 | // Increase OFF so that it is congruent to ADDR modulo ABI_PAGESIZE. |
2118 | ||
2119 | static off_t | |
2120 | align_file_offset(off_t off, uint64_t addr, uint64_t abi_pagesize) | |
2121 | { | |
2122 | uint64_t unsigned_off = off; | |
2123 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) | |
2124 | | (addr & (abi_pagesize - 1))); | |
2125 | if (aligned_off < unsigned_off) | |
2126 | aligned_off += abi_pagesize; | |
2127 | return aligned_off; | |
2128 | } | |
2129 | ||
ead1e424 ILT |
2130 | // Set the file offsets of all the segments, and all the sections they |
2131 | // contain. They have all been created. LOAD_SEG must be be laid out | |
2132 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
2133 | |
2134 | off_t | |
ead1e424 ILT |
2135 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
2136 | unsigned int *pshndx) | |
75f65a3e ILT |
2137 | { |
2138 | // Sort them into the final order. | |
54dc6425 ILT |
2139 | std::sort(this->segment_list_.begin(), this->segment_list_.end(), |
2140 | Layout::Compare_segments()); | |
2141 | ||
75f65a3e ILT |
2142 | // Find the PT_LOAD segments, and set their addresses and offsets |
2143 | // and their section's addresses and offsets. | |
0c5e9c22 | 2144 | uint64_t addr; |
e55bde5e ILT |
2145 | if (parameters->options().user_set_Ttext()) |
2146 | addr = parameters->options().Ttext(); | |
8851ecca | 2147 | else if (parameters->options().shared()) |
a445fddf | 2148 | addr = 0; |
0c5e9c22 ILT |
2149 | else |
2150 | addr = target->default_text_segment_address(); | |
75f65a3e | 2151 | off_t off = 0; |
a445fddf ILT |
2152 | |
2153 | // If LOAD_SEG is NULL, then the file header and segment headers | |
2154 | // will not be loadable. But they still need to be at offset 0 in | |
2155 | // the file. Set their offsets now. | |
2156 | if (load_seg == NULL) | |
2157 | { | |
2158 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
2159 | p != this->special_output_list_.end(); | |
2160 | ++p) | |
2161 | { | |
2162 | off = align_address(off, (*p)->addralign()); | |
2163 | (*p)->set_address_and_file_offset(0, off); | |
2164 | off += (*p)->data_size(); | |
2165 | } | |
2166 | } | |
2167 | ||
34810851 ILT |
2168 | const bool check_sections = parameters->options().check_sections(); |
2169 | Output_segment* last_load_segment = NULL; | |
2170 | ||
75f65a3e ILT |
2171 | bool was_readonly = false; |
2172 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
2173 | p != this->segment_list_.end(); | |
2174 | ++p) | |
2175 | { | |
2176 | if ((*p)->type() == elfcpp::PT_LOAD) | |
2177 | { | |
2178 | if (load_seg != NULL && load_seg != *p) | |
a3ad94ed | 2179 | gold_unreachable(); |
75f65a3e ILT |
2180 | load_seg = NULL; |
2181 | ||
756ac4a8 ILT |
2182 | bool are_addresses_set = (*p)->are_addresses_set(); |
2183 | if (are_addresses_set) | |
2184 | { | |
2185 | // When it comes to setting file offsets, we care about | |
2186 | // the physical address. | |
2187 | addr = (*p)->paddr(); | |
2188 | } | |
e55bde5e | 2189 | else if (parameters->options().user_set_Tdata() |
756ac4a8 | 2190 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
e55bde5e | 2191 | && (!parameters->options().user_set_Tbss() |
756ac4a8 ILT |
2192 | || (*p)->has_any_data_sections())) |
2193 | { | |
e55bde5e | 2194 | addr = parameters->options().Tdata(); |
756ac4a8 ILT |
2195 | are_addresses_set = true; |
2196 | } | |
e55bde5e | 2197 | else if (parameters->options().user_set_Tbss() |
756ac4a8 ILT |
2198 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
2199 | && !(*p)->has_any_data_sections()) | |
2200 | { | |
e55bde5e | 2201 | addr = parameters->options().Tbss(); |
756ac4a8 ILT |
2202 | are_addresses_set = true; |
2203 | } | |
2204 | ||
75f65a3e ILT |
2205 | uint64_t orig_addr = addr; |
2206 | uint64_t orig_off = off; | |
2207 | ||
a445fddf | 2208 | uint64_t aligned_addr = 0; |
75f65a3e | 2209 | uint64_t abi_pagesize = target->abi_pagesize(); |
af6156ef | 2210 | uint64_t common_pagesize = target->common_pagesize(); |
0496d5e5 | 2211 | |
af6156ef ILT |
2212 | if (!parameters->options().nmagic() |
2213 | && !parameters->options().omagic()) | |
2214 | (*p)->set_minimum_p_align(common_pagesize); | |
0496d5e5 | 2215 | |
8a5e3e08 | 2216 | if (!are_addresses_set) |
a445fddf ILT |
2217 | { |
2218 | // If the last segment was readonly, and this one is | |
2219 | // not, then skip the address forward one page, | |
2220 | // maintaining the same position within the page. This | |
2221 | // lets us store both segments overlapping on a single | |
2222 | // page in the file, but the loader will put them on | |
2223 | // different pages in memory. | |
2224 | ||
2225 | addr = align_address(addr, (*p)->maximum_alignment()); | |
75f65a3e | 2226 | aligned_addr = addr; |
a445fddf ILT |
2227 | |
2228 | if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0) | |
2229 | { | |
2230 | if ((addr & (abi_pagesize - 1)) != 0) | |
2231 | addr = addr + abi_pagesize; | |
2232 | } | |
2233 | ||
2234 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); | |
75f65a3e ILT |
2235 | } |
2236 | ||
8a5e3e08 ILT |
2237 | if (!parameters->options().nmagic() |
2238 | && !parameters->options().omagic()) | |
2239 | off = align_file_offset(off, addr, abi_pagesize); | |
2240 | ||
ead1e424 | 2241 | unsigned int shndx_hold = *pshndx; |
96a2b4e4 ILT |
2242 | uint64_t new_addr = (*p)->set_section_addresses(this, false, addr, |
2243 | &off, pshndx); | |
75f65a3e ILT |
2244 | |
2245 | // Now that we know the size of this segment, we may be able | |
2246 | // to save a page in memory, at the cost of wasting some | |
2247 | // file space, by instead aligning to the start of a new | |
2248 | // page. Here we use the real machine page size rather than | |
2249 | // the ABI mandated page size. | |
2250 | ||
a445fddf | 2251 | if (!are_addresses_set && aligned_addr != addr) |
75f65a3e | 2252 | { |
75f65a3e ILT |
2253 | uint64_t first_off = (common_pagesize |
2254 | - (aligned_addr | |
2255 | & (common_pagesize - 1))); | |
2256 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
2257 | if (first_off > 0 | |
2258 | && last_off > 0 | |
2259 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
2260 | != (new_addr & ~ (common_pagesize - 1))) | |
2261 | && first_off + last_off <= common_pagesize) | |
2262 | { | |
ead1e424 ILT |
2263 | *pshndx = shndx_hold; |
2264 | addr = align_address(aligned_addr, common_pagesize); | |
a445fddf | 2265 | addr = align_address(addr, (*p)->maximum_alignment()); |
75f65a3e | 2266 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
8a5e3e08 | 2267 | off = align_file_offset(off, addr, abi_pagesize); |
96a2b4e4 ILT |
2268 | new_addr = (*p)->set_section_addresses(this, true, addr, |
2269 | &off, pshndx); | |
75f65a3e ILT |
2270 | } |
2271 | } | |
2272 | ||
2273 | addr = new_addr; | |
2274 | ||
2275 | if (((*p)->flags() & elfcpp::PF_W) == 0) | |
2276 | was_readonly = true; | |
34810851 ILT |
2277 | |
2278 | // Implement --check-sections. We know that the segments | |
2279 | // are sorted by LMA. | |
2280 | if (check_sections && last_load_segment != NULL) | |
2281 | { | |
2282 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); | |
2283 | if (last_load_segment->paddr() + last_load_segment->memsz() | |
2284 | > (*p)->paddr()) | |
2285 | { | |
2286 | unsigned long long lb1 = last_load_segment->paddr(); | |
2287 | unsigned long long le1 = lb1 + last_load_segment->memsz(); | |
2288 | unsigned long long lb2 = (*p)->paddr(); | |
2289 | unsigned long long le2 = lb2 + (*p)->memsz(); | |
2290 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " | |
2291 | "[0x%llx -> 0x%llx]"), | |
2292 | lb1, le1, lb2, le2); | |
2293 | } | |
2294 | } | |
2295 | last_load_segment = *p; | |
75f65a3e ILT |
2296 | } |
2297 | } | |
2298 | ||
2299 | // Handle the non-PT_LOAD segments, setting their offsets from their | |
2300 | // section's offsets. | |
2301 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
2302 | p != this->segment_list_.end(); | |
2303 | ++p) | |
2304 | { | |
2305 | if ((*p)->type() != elfcpp::PT_LOAD) | |
2306 | (*p)->set_offset(); | |
2307 | } | |
2308 | ||
7bf1f802 ILT |
2309 | // Set the TLS offsets for each section in the PT_TLS segment. |
2310 | if (this->tls_segment_ != NULL) | |
2311 | this->tls_segment_->set_tls_offsets(); | |
2312 | ||
75f65a3e ILT |
2313 | return off; |
2314 | } | |
2315 | ||
6a74a719 ILT |
2316 | // Set the offsets of all the allocated sections when doing a |
2317 | // relocatable link. This does the same jobs as set_segment_offsets, | |
2318 | // only for a relocatable link. | |
2319 | ||
2320 | off_t | |
2321 | Layout::set_relocatable_section_offsets(Output_data* file_header, | |
2322 | unsigned int *pshndx) | |
2323 | { | |
2324 | off_t off = 0; | |
2325 | ||
2326 | file_header->set_address_and_file_offset(0, 0); | |
2327 | off += file_header->data_size(); | |
2328 | ||
2329 | for (Section_list::iterator p = this->section_list_.begin(); | |
2330 | p != this->section_list_.end(); | |
2331 | ++p) | |
2332 | { | |
2333 | // We skip unallocated sections here, except that group sections | |
2334 | // have to come first. | |
2335 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 | |
2336 | && (*p)->type() != elfcpp::SHT_GROUP) | |
2337 | continue; | |
2338 | ||
2339 | off = align_address(off, (*p)->addralign()); | |
2340 | ||
2341 | // The linker script might have set the address. | |
2342 | if (!(*p)->is_address_valid()) | |
2343 | (*p)->set_address(0); | |
2344 | (*p)->set_file_offset(off); | |
2345 | (*p)->finalize_data_size(); | |
2346 | off += (*p)->data_size(); | |
2347 | ||
2348 | (*p)->set_out_shndx(*pshndx); | |
2349 | ++*pshndx; | |
2350 | } | |
2351 | ||
2352 | return off; | |
2353 | } | |
2354 | ||
75f65a3e ILT |
2355 | // Set the file offset of all the sections not associated with a |
2356 | // segment. | |
2357 | ||
2358 | off_t | |
9a0910c3 | 2359 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 2360 | { |
a3ad94ed ILT |
2361 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
2362 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
2363 | ++p) |
2364 | { | |
27bc2bce ILT |
2365 | // The symtab section is handled in create_symtab_sections. |
2366 | if (*p == this->symtab_section_) | |
61ba1cf9 | 2367 | continue; |
27bc2bce | 2368 | |
a9a60db6 ILT |
2369 | // If we've already set the data size, don't set it again. |
2370 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) | |
2371 | continue; | |
2372 | ||
96803768 ILT |
2373 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2374 | && (*p)->requires_postprocessing()) | |
17a1d0a9 ILT |
2375 | { |
2376 | (*p)->create_postprocessing_buffer(); | |
2377 | this->any_postprocessing_sections_ = true; | |
2378 | } | |
96803768 | 2379 | |
9a0910c3 ILT |
2380 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2381 | && (*p)->after_input_sections()) | |
2382 | continue; | |
17a1d0a9 | 2383 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
2384 | && (!(*p)->after_input_sections() |
2385 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
2386 | continue; | |
17a1d0a9 | 2387 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
2388 | && (!(*p)->after_input_sections() |
2389 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
2390 | continue; | |
27bc2bce | 2391 | |
ead1e424 | 2392 | off = align_address(off, (*p)->addralign()); |
27bc2bce ILT |
2393 | (*p)->set_file_offset(off); |
2394 | (*p)->finalize_data_size(); | |
75f65a3e | 2395 | off += (*p)->data_size(); |
96803768 ILT |
2396 | |
2397 | // At this point the name must be set. | |
17a1d0a9 | 2398 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
96803768 | 2399 | this->namepool_.add((*p)->name(), false, NULL); |
75f65a3e ILT |
2400 | } |
2401 | return off; | |
2402 | } | |
2403 | ||
86887060 ILT |
2404 | // Set the section indexes of all the sections not associated with a |
2405 | // segment. | |
2406 | ||
2407 | unsigned int | |
2408 | Layout::set_section_indexes(unsigned int shndx) | |
2409 | { | |
2410 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
2411 | p != this->unattached_section_list_.end(); | |
2412 | ++p) | |
2413 | { | |
d491d34e ILT |
2414 | if (!(*p)->has_out_shndx()) |
2415 | { | |
2416 | (*p)->set_out_shndx(shndx); | |
2417 | ++shndx; | |
2418 | } | |
86887060 ILT |
2419 | } |
2420 | return shndx; | |
2421 | } | |
2422 | ||
a445fddf ILT |
2423 | // Set the section addresses according to the linker script. This is |
2424 | // only called when we see a SECTIONS clause. This returns the | |
2425 | // program segment which should hold the file header and segment | |
2426 | // headers, if any. It will return NULL if they should not be in a | |
2427 | // segment. | |
2428 | ||
2429 | Output_segment* | |
2430 | Layout::set_section_addresses_from_script(Symbol_table* symtab) | |
20e6d0d6 DK |
2431 | { |
2432 | Script_sections* ss = this->script_options_->script_sections(); | |
2433 | gold_assert(ss->saw_sections_clause()); | |
2434 | return this->script_options_->set_section_addresses(symtab, this); | |
2435 | } | |
2436 | ||
2437 | // Place the orphan sections in the linker script. | |
2438 | ||
2439 | void | |
2440 | Layout::place_orphan_sections_in_script() | |
a445fddf ILT |
2441 | { |
2442 | Script_sections* ss = this->script_options_->script_sections(); | |
2443 | gold_assert(ss->saw_sections_clause()); | |
2444 | ||
2445 | // Place each orphaned output section in the script. | |
2446 | for (Section_list::iterator p = this->section_list_.begin(); | |
2447 | p != this->section_list_.end(); | |
2448 | ++p) | |
2449 | { | |
2450 | if (!(*p)->found_in_sections_clause()) | |
2451 | ss->place_orphan(*p); | |
2452 | } | |
a445fddf ILT |
2453 | } |
2454 | ||
7bf1f802 ILT |
2455 | // Count the local symbols in the regular symbol table and the dynamic |
2456 | // symbol table, and build the respective string pools. | |
2457 | ||
2458 | void | |
17a1d0a9 ILT |
2459 | Layout::count_local_symbols(const Task* task, |
2460 | const Input_objects* input_objects) | |
7bf1f802 | 2461 | { |
6d013333 ILT |
2462 | // First, figure out an upper bound on the number of symbols we'll |
2463 | // be inserting into each pool. This helps us create the pools with | |
2464 | // the right size, to avoid unnecessary hashtable resizing. | |
2465 | unsigned int symbol_count = 0; | |
2466 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2467 | p != input_objects->relobj_end(); | |
2468 | ++p) | |
2469 | symbol_count += (*p)->local_symbol_count(); | |
2470 | ||
2471 | // Go from "upper bound" to "estimate." We overcount for two | |
2472 | // reasons: we double-count symbols that occur in more than one | |
2473 | // object file, and we count symbols that are dropped from the | |
2474 | // output. Add it all together and assume we overcount by 100%. | |
2475 | symbol_count /= 2; | |
2476 | ||
2477 | // We assume all symbols will go into both the sympool and dynpool. | |
2478 | this->sympool_.reserve(symbol_count); | |
2479 | this->dynpool_.reserve(symbol_count); | |
2480 | ||
7bf1f802 ILT |
2481 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2482 | p != input_objects->relobj_end(); | |
2483 | ++p) | |
2484 | { | |
17a1d0a9 | 2485 | Task_lock_obj<Object> tlo(task, *p); |
7bf1f802 ILT |
2486 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
2487 | } | |
2488 | } | |
2489 | ||
b8e6aad9 ILT |
2490 | // Create the symbol table sections. Here we also set the final |
2491 | // values of the symbols. At this point all the loadable sections are | |
d491d34e | 2492 | // fully laid out. SHNUM is the number of sections so far. |
75f65a3e ILT |
2493 | |
2494 | void | |
9025d29d | 2495 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 2496 | Symbol_table* symtab, |
d491d34e | 2497 | unsigned int shnum, |
16649710 | 2498 | off_t* poff) |
75f65a3e | 2499 | { |
61ba1cf9 ILT |
2500 | int symsize; |
2501 | unsigned int align; | |
8851ecca | 2502 | if (parameters->target().get_size() == 32) |
61ba1cf9 ILT |
2503 | { |
2504 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
2505 | align = 4; | |
2506 | } | |
8851ecca | 2507 | else if (parameters->target().get_size() == 64) |
61ba1cf9 ILT |
2508 | { |
2509 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
2510 | align = 8; | |
2511 | } | |
2512 | else | |
a3ad94ed | 2513 | gold_unreachable(); |
61ba1cf9 ILT |
2514 | |
2515 | off_t off = *poff; | |
ead1e424 | 2516 | off = align_address(off, align); |
61ba1cf9 ILT |
2517 | off_t startoff = off; |
2518 | ||
2519 | // Save space for the dummy symbol at the start of the section. We | |
2520 | // never bother to write this out--it will just be left as zero. | |
2521 | off += symsize; | |
c06b7b0b | 2522 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 2523 | |
a3ad94ed ILT |
2524 | // Add STT_SECTION symbols for each Output section which needs one. |
2525 | for (Section_list::iterator p = this->section_list_.begin(); | |
2526 | p != this->section_list_.end(); | |
2527 | ++p) | |
2528 | { | |
2529 | if (!(*p)->needs_symtab_index()) | |
2530 | (*p)->set_symtab_index(-1U); | |
2531 | else | |
2532 | { | |
2533 | (*p)->set_symtab_index(local_symbol_index); | |
2534 | ++local_symbol_index; | |
2535 | off += symsize; | |
2536 | } | |
2537 | } | |
2538 | ||
f6ce93d6 ILT |
2539 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2540 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
2541 | ++p) |
2542 | { | |
c06b7b0b | 2543 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
ef15dade | 2544 | off, symtab); |
c06b7b0b ILT |
2545 | off += (index - local_symbol_index) * symsize; |
2546 | local_symbol_index = index; | |
75f65a3e ILT |
2547 | } |
2548 | ||
c06b7b0b | 2549 | unsigned int local_symcount = local_symbol_index; |
75aea3d0 | 2550 | gold_assert(static_cast<off_t>(local_symcount * symsize) == off - startoff); |
61ba1cf9 | 2551 | |
16649710 ILT |
2552 | off_t dynoff; |
2553 | size_t dyn_global_index; | |
2554 | size_t dyncount; | |
2555 | if (this->dynsym_section_ == NULL) | |
2556 | { | |
2557 | dynoff = 0; | |
2558 | dyn_global_index = 0; | |
2559 | dyncount = 0; | |
2560 | } | |
2561 | else | |
2562 | { | |
2563 | dyn_global_index = this->dynsym_section_->info(); | |
2564 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); | |
2565 | dynoff = this->dynsym_section_->offset() + locsize; | |
2566 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 2567 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
2568 | == this->dynsym_section_->data_size() - locsize); |
2569 | } | |
2570 | ||
55a93433 ILT |
2571 | off = symtab->finalize(off, dynoff, dyn_global_index, dyncount, |
2572 | &this->sympool_, &local_symcount); | |
75f65a3e | 2573 | |
8851ecca | 2574 | if (!parameters->options().strip_all()) |
9e2dcb77 ILT |
2575 | { |
2576 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 2577 | |
cfd73a4e | 2578 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
2579 | Output_section* osymtab = this->make_output_section(symtab_name, |
2580 | elfcpp::SHT_SYMTAB, | |
2581 | 0); | |
2582 | this->symtab_section_ = osymtab; | |
a3ad94ed | 2583 | |
27bc2bce | 2584 | Output_section_data* pos = new Output_data_fixed_space(off - startoff, |
7d9e3d98 ILT |
2585 | align, |
2586 | "** symtab"); | |
9e2dcb77 | 2587 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 2588 | |
d491d34e ILT |
2589 | // We generate a .symtab_shndx section if we have more than |
2590 | // SHN_LORESERVE sections. Technically it is possible that we | |
2591 | // don't need one, because it is possible that there are no | |
2592 | // symbols in any of sections with indexes larger than | |
2593 | // SHN_LORESERVE. That is probably unusual, though, and it is | |
2594 | // easier to always create one than to compute section indexes | |
2595 | // twice (once here, once when writing out the symbols). | |
2596 | if (shnum >= elfcpp::SHN_LORESERVE) | |
2597 | { | |
2598 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", | |
2599 | false, NULL); | |
2600 | Output_section* osymtab_xindex = | |
2601 | this->make_output_section(symtab_xindex_name, | |
2602 | elfcpp::SHT_SYMTAB_SHNDX, 0); | |
2603 | ||
2604 | size_t symcount = (off - startoff) / symsize; | |
2605 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); | |
2606 | ||
2607 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); | |
2608 | ||
2609 | osymtab_xindex->set_link_section(osymtab); | |
2610 | osymtab_xindex->set_addralign(4); | |
2611 | osymtab_xindex->set_entsize(4); | |
2612 | ||
2613 | osymtab_xindex->set_after_input_sections(); | |
2614 | ||
2615 | // This tells the driver code to wait until the symbol table | |
2616 | // has written out before writing out the postprocessing | |
2617 | // sections, including the .symtab_shndx section. | |
2618 | this->any_postprocessing_sections_ = true; | |
2619 | } | |
2620 | ||
cfd73a4e | 2621 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
2622 | Output_section* ostrtab = this->make_output_section(strtab_name, |
2623 | elfcpp::SHT_STRTAB, | |
2624 | 0); | |
a3ad94ed | 2625 | |
9e2dcb77 ILT |
2626 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
2627 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 2628 | |
27bc2bce ILT |
2629 | osymtab->set_file_offset(startoff); |
2630 | osymtab->finalize_data_size(); | |
9e2dcb77 ILT |
2631 | osymtab->set_link_section(ostrtab); |
2632 | osymtab->set_info(local_symcount); | |
2633 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 2634 | |
9e2dcb77 ILT |
2635 | *poff = off; |
2636 | } | |
75f65a3e ILT |
2637 | } |
2638 | ||
2639 | // Create the .shstrtab section, which holds the names of the | |
2640 | // sections. At the time this is called, we have created all the | |
2641 | // output sections except .shstrtab itself. | |
2642 | ||
2643 | Output_section* | |
2644 | Layout::create_shstrtab() | |
2645 | { | |
2646 | // FIXME: We don't need to create a .shstrtab section if we are | |
2647 | // stripping everything. | |
2648 | ||
cfd73a4e | 2649 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 2650 | |
a3ad94ed | 2651 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0); |
75f65a3e | 2652 | |
27bc2bce ILT |
2653 | // We can't write out this section until we've set all the section |
2654 | // names, and we don't set the names of compressed output sections | |
2655 | // until relocations are complete. | |
2656 | os->set_after_input_sections(); | |
2657 | ||
a3ad94ed ILT |
2658 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
2659 | os->add_output_section_data(posd); | |
75f65a3e ILT |
2660 | |
2661 | return os; | |
2662 | } | |
2663 | ||
2664 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
2665 | // offset. | |
2666 | ||
27bc2bce | 2667 | void |
d491d34e | 2668 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
75f65a3e ILT |
2669 | { |
2670 | Output_section_headers* oshdrs; | |
9025d29d | 2671 | oshdrs = new Output_section_headers(this, |
16649710 | 2672 | &this->segment_list_, |
6a74a719 | 2673 | &this->section_list_, |
16649710 | 2674 | &this->unattached_section_list_, |
d491d34e ILT |
2675 | &this->namepool_, |
2676 | shstrtab_section); | |
ead1e424 | 2677 | off_t off = align_address(*poff, oshdrs->addralign()); |
27bc2bce | 2678 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 ILT |
2679 | off += oshdrs->data_size(); |
2680 | *poff = off; | |
27bc2bce | 2681 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
2682 | } |
2683 | ||
d491d34e ILT |
2684 | // Count the allocated sections. |
2685 | ||
2686 | size_t | |
2687 | Layout::allocated_output_section_count() const | |
2688 | { | |
2689 | size_t section_count = 0; | |
2690 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
2691 | p != this->segment_list_.end(); | |
2692 | ++p) | |
2693 | section_count += (*p)->output_section_count(); | |
2694 | return section_count; | |
2695 | } | |
2696 | ||
dbe717ef ILT |
2697 | // Create the dynamic symbol table. |
2698 | ||
2699 | void | |
7bf1f802 | 2700 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
9b07f471 | 2701 | Symbol_table* symtab, |
14b31740 ILT |
2702 | Output_section **pdynstr, |
2703 | unsigned int* plocal_dynamic_count, | |
2704 | std::vector<Symbol*>* pdynamic_symbols, | |
2705 | Versions* pversions) | |
dbe717ef | 2706 | { |
a3ad94ed ILT |
2707 | // Count all the symbols in the dynamic symbol table, and set the |
2708 | // dynamic symbol indexes. | |
dbe717ef | 2709 | |
a3ad94ed ILT |
2710 | // Skip symbol 0, which is always all zeroes. |
2711 | unsigned int index = 1; | |
dbe717ef | 2712 | |
a3ad94ed ILT |
2713 | // Add STT_SECTION symbols for each Output section which needs one. |
2714 | for (Section_list::iterator p = this->section_list_.begin(); | |
2715 | p != this->section_list_.end(); | |
2716 | ++p) | |
2717 | { | |
2718 | if (!(*p)->needs_dynsym_index()) | |
2719 | (*p)->set_dynsym_index(-1U); | |
2720 | else | |
2721 | { | |
2722 | (*p)->set_dynsym_index(index); | |
2723 | ++index; | |
2724 | } | |
2725 | } | |
2726 | ||
7bf1f802 ILT |
2727 | // Count the local symbols that need to go in the dynamic symbol table, |
2728 | // and set the dynamic symbol indexes. | |
2729 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2730 | p != input_objects->relobj_end(); | |
2731 | ++p) | |
2732 | { | |
2733 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
2734 | index = new_index; | |
2735 | } | |
a3ad94ed ILT |
2736 | |
2737 | unsigned int local_symcount = index; | |
14b31740 | 2738 | *plocal_dynamic_count = local_symcount; |
a3ad94ed | 2739 | |
9b07f471 | 2740 | index = symtab->set_dynsym_indexes(index, pdynamic_symbols, |
35cdfc9a | 2741 | &this->dynpool_, pversions); |
a3ad94ed ILT |
2742 | |
2743 | int symsize; | |
2744 | unsigned int align; | |
8851ecca | 2745 | const int size = parameters->target().get_size(); |
a3ad94ed ILT |
2746 | if (size == 32) |
2747 | { | |
2748 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
2749 | align = 4; | |
2750 | } | |
2751 | else if (size == 64) | |
2752 | { | |
2753 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
2754 | align = 8; | |
2755 | } | |
2756 | else | |
2757 | gold_unreachable(); | |
2758 | ||
14b31740 ILT |
2759 | // Create the dynamic symbol table section. |
2760 | ||
3802b2dd ILT |
2761 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
2762 | elfcpp::SHT_DYNSYM, | |
2763 | elfcpp::SHF_ALLOC, | |
2764 | false); | |
a3ad94ed | 2765 | |
27bc2bce | 2766 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, |
7d9e3d98 ILT |
2767 | align, |
2768 | "** dynsym"); | |
a3ad94ed ILT |
2769 | dynsym->add_output_section_data(odata); |
2770 | ||
2771 | dynsym->set_info(local_symcount); | |
2772 | dynsym->set_entsize(symsize); | |
2773 | dynsym->set_addralign(align); | |
2774 | ||
2775 | this->dynsym_section_ = dynsym; | |
2776 | ||
16649710 | 2777 | Output_data_dynamic* const odyn = this->dynamic_data_; |
a3ad94ed ILT |
2778 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); |
2779 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
2780 | ||
d491d34e ILT |
2781 | // If there are more than SHN_LORESERVE allocated sections, we |
2782 | // create a .dynsym_shndx section. It is possible that we don't | |
2783 | // need one, because it is possible that there are no dynamic | |
2784 | // symbols in any of the sections with indexes larger than | |
2785 | // SHN_LORESERVE. This is probably unusual, though, and at this | |
2786 | // time we don't know the actual section indexes so it is | |
2787 | // inconvenient to check. | |
2788 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) | |
2789 | { | |
2790 | Output_section* dynsym_xindex = | |
2791 | this->choose_output_section(NULL, ".dynsym_shndx", | |
2792 | elfcpp::SHT_SYMTAB_SHNDX, | |
2793 | elfcpp::SHF_ALLOC, | |
2794 | false); | |
2795 | ||
2796 | this->dynsym_xindex_ = new Output_symtab_xindex(index); | |
2797 | ||
2798 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); | |
2799 | ||
2800 | dynsym_xindex->set_link_section(dynsym); | |
2801 | dynsym_xindex->set_addralign(4); | |
2802 | dynsym_xindex->set_entsize(4); | |
2803 | ||
2804 | dynsym_xindex->set_after_input_sections(); | |
2805 | ||
2806 | // This tells the driver code to wait until the symbol table has | |
2807 | // written out before writing out the postprocessing sections, | |
2808 | // including the .dynsym_shndx section. | |
2809 | this->any_postprocessing_sections_ = true; | |
2810 | } | |
2811 | ||
14b31740 ILT |
2812 | // Create the dynamic string table section. |
2813 | ||
3802b2dd ILT |
2814 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
2815 | elfcpp::SHT_STRTAB, | |
2816 | elfcpp::SHF_ALLOC, | |
2817 | false); | |
a3ad94ed ILT |
2818 | |
2819 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
2820 | dynstr->add_output_section_data(strdata); | |
2821 | ||
16649710 ILT |
2822 | dynsym->set_link_section(dynstr); |
2823 | this->dynamic_section_->set_link_section(dynstr); | |
2824 | ||
a3ad94ed ILT |
2825 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); |
2826 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
2827 | ||
14b31740 ILT |
2828 | *pdynstr = dynstr; |
2829 | ||
2830 | // Create the hash tables. | |
2831 | ||
13670ee6 ILT |
2832 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
2833 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
2834 | { | |
2835 | unsigned char* phash; | |
2836 | unsigned int hashlen; | |
2837 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, | |
2838 | &phash, &hashlen); | |
2839 | ||
2840 | Output_section* hashsec = this->choose_output_section(NULL, ".hash", | |
2841 | elfcpp::SHT_HASH, | |
2842 | elfcpp::SHF_ALLOC, | |
2843 | false); | |
2844 | ||
2845 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
2846 | hashlen, | |
7d9e3d98 ILT |
2847 | align, |
2848 | "** hash"); | |
13670ee6 ILT |
2849 | hashsec->add_output_section_data(hashdata); |
2850 | ||
2851 | hashsec->set_link_section(dynsym); | |
2852 | hashsec->set_entsize(4); | |
a3ad94ed | 2853 | |
13670ee6 ILT |
2854 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); |
2855 | } | |
2856 | ||
2857 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 | |
2858 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
2859 | { | |
2860 | unsigned char* phash; | |
2861 | unsigned int hashlen; | |
2862 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, local_symcount, | |
2863 | &phash, &hashlen); | |
a3ad94ed | 2864 | |
13670ee6 ILT |
2865 | Output_section* hashsec = this->choose_output_section(NULL, ".gnu.hash", |
2866 | elfcpp::SHT_GNU_HASH, | |
2867 | elfcpp::SHF_ALLOC, | |
2868 | false); | |
a3ad94ed | 2869 | |
13670ee6 ILT |
2870 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
2871 | hashlen, | |
7d9e3d98 ILT |
2872 | align, |
2873 | "** hash"); | |
13670ee6 | 2874 | hashsec->add_output_section_data(hashdata); |
a3ad94ed | 2875 | |
13670ee6 ILT |
2876 | hashsec->set_link_section(dynsym); |
2877 | hashsec->set_entsize(4); | |
a3ad94ed | 2878 | |
13670ee6 ILT |
2879 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); |
2880 | } | |
dbe717ef ILT |
2881 | } |
2882 | ||
7bf1f802 ILT |
2883 | // Assign offsets to each local portion of the dynamic symbol table. |
2884 | ||
2885 | void | |
2886 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
2887 | { | |
2888 | Output_section* dynsym = this->dynsym_section_; | |
2889 | gold_assert(dynsym != NULL); | |
2890 | ||
2891 | off_t off = dynsym->offset(); | |
2892 | ||
2893 | // Skip the dummy symbol at the start of the section. | |
2894 | off += dynsym->entsize(); | |
2895 | ||
2896 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2897 | p != input_objects->relobj_end(); | |
2898 | ++p) | |
2899 | { | |
2900 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
2901 | off += count * dynsym->entsize(); | |
2902 | } | |
2903 | } | |
2904 | ||
14b31740 ILT |
2905 | // Create the version sections. |
2906 | ||
2907 | void | |
9025d29d | 2908 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 2909 | const Symbol_table* symtab, |
14b31740 ILT |
2910 | unsigned int local_symcount, |
2911 | const std::vector<Symbol*>& dynamic_symbols, | |
2912 | const Output_section* dynstr) | |
2913 | { | |
2914 | if (!versions->any_defs() && !versions->any_needs()) | |
2915 | return; | |
2916 | ||
8851ecca | 2917 | switch (parameters->size_and_endianness()) |
14b31740 | 2918 | { |
193a53d9 | 2919 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2920 | case Parameters::TARGET_32_LITTLE: |
7d1a9ebb ILT |
2921 | this->sized_create_version_sections<32, false>(versions, symtab, |
2922 | local_symcount, | |
2923 | dynamic_symbols, dynstr); | |
8851ecca | 2924 | break; |
193a53d9 | 2925 | #endif |
8851ecca ILT |
2926 | #ifdef HAVE_TARGET_32_BIG |
2927 | case Parameters::TARGET_32_BIG: | |
7d1a9ebb ILT |
2928 | this->sized_create_version_sections<32, true>(versions, symtab, |
2929 | local_symcount, | |
2930 | dynamic_symbols, dynstr); | |
8851ecca | 2931 | break; |
193a53d9 | 2932 | #endif |
193a53d9 | 2933 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2934 | case Parameters::TARGET_64_LITTLE: |
7d1a9ebb ILT |
2935 | this->sized_create_version_sections<64, false>(versions, symtab, |
2936 | local_symcount, | |
2937 | dynamic_symbols, dynstr); | |
8851ecca | 2938 | break; |
193a53d9 | 2939 | #endif |
8851ecca ILT |
2940 | #ifdef HAVE_TARGET_64_BIG |
2941 | case Parameters::TARGET_64_BIG: | |
7d1a9ebb ILT |
2942 | this->sized_create_version_sections<64, true>(versions, symtab, |
2943 | local_symcount, | |
2944 | dynamic_symbols, dynstr); | |
8851ecca ILT |
2945 | break; |
2946 | #endif | |
2947 | default: | |
2948 | gold_unreachable(); | |
14b31740 | 2949 | } |
14b31740 ILT |
2950 | } |
2951 | ||
2952 | // Create the version sections, sized version. | |
2953 | ||
2954 | template<int size, bool big_endian> | |
2955 | void | |
2956 | Layout::sized_create_version_sections( | |
2957 | const Versions* versions, | |
46fe1623 | 2958 | const Symbol_table* symtab, |
14b31740 ILT |
2959 | unsigned int local_symcount, |
2960 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 2961 | const Output_section* dynstr) |
14b31740 | 2962 | { |
3802b2dd ILT |
2963 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
2964 | elfcpp::SHT_GNU_versym, | |
2965 | elfcpp::SHF_ALLOC, | |
2966 | false); | |
14b31740 ILT |
2967 | |
2968 | unsigned char* vbuf; | |
2969 | unsigned int vsize; | |
7d1a9ebb ILT |
2970 | versions->symbol_section_contents<size, big_endian>(symtab, &this->dynpool_, |
2971 | local_symcount, | |
2972 | dynamic_symbols, | |
2973 | &vbuf, &vsize); | |
14b31740 | 2974 | |
7d9e3d98 ILT |
2975 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, |
2976 | "** versions"); | |
14b31740 ILT |
2977 | |
2978 | vsec->add_output_section_data(vdata); | |
2979 | vsec->set_entsize(2); | |
2980 | vsec->set_link_section(this->dynsym_section_); | |
2981 | ||
2982 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
2983 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
2984 | ||
2985 | if (versions->any_defs()) | |
2986 | { | |
3802b2dd ILT |
2987 | Output_section* vdsec; |
2988 | vdsec= this->choose_output_section(NULL, ".gnu.version_d", | |
2989 | elfcpp::SHT_GNU_verdef, | |
2990 | elfcpp::SHF_ALLOC, | |
2991 | false); | |
14b31740 ILT |
2992 | |
2993 | unsigned char* vdbuf; | |
2994 | unsigned int vdsize; | |
2995 | unsigned int vdentries; | |
7d1a9ebb ILT |
2996 | versions->def_section_contents<size, big_endian>(&this->dynpool_, &vdbuf, |
2997 | &vdsize, &vdentries); | |
14b31740 | 2998 | |
7d9e3d98 ILT |
2999 | Output_section_data* vddata = |
3000 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); | |
14b31740 ILT |
3001 | |
3002 | vdsec->add_output_section_data(vddata); | |
3003 | vdsec->set_link_section(dynstr); | |
3004 | vdsec->set_info(vdentries); | |
3005 | ||
3006 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
3007 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
3008 | } | |
3009 | ||
3010 | if (versions->any_needs()) | |
3011 | { | |
14b31740 | 3012 | Output_section* vnsec; |
3802b2dd ILT |
3013 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
3014 | elfcpp::SHT_GNU_verneed, | |
3015 | elfcpp::SHF_ALLOC, | |
3016 | false); | |
14b31740 ILT |
3017 | |
3018 | unsigned char* vnbuf; | |
3019 | unsigned int vnsize; | |
3020 | unsigned int vnentries; | |
7d1a9ebb ILT |
3021 | versions->need_section_contents<size, big_endian>(&this->dynpool_, |
3022 | &vnbuf, &vnsize, | |
3023 | &vnentries); | |
14b31740 | 3024 | |
7d9e3d98 ILT |
3025 | Output_section_data* vndata = |
3026 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); | |
14b31740 ILT |
3027 | |
3028 | vnsec->add_output_section_data(vndata); | |
3029 | vnsec->set_link_section(dynstr); | |
3030 | vnsec->set_info(vnentries); | |
3031 | ||
3032 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
3033 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
3034 | } | |
3035 | } | |
3036 | ||
dbe717ef ILT |
3037 | // Create the .interp section and PT_INTERP segment. |
3038 | ||
3039 | void | |
3040 | Layout::create_interp(const Target* target) | |
3041 | { | |
e55bde5e | 3042 | const char* interp = parameters->options().dynamic_linker(); |
dbe717ef ILT |
3043 | if (interp == NULL) |
3044 | { | |
3045 | interp = target->dynamic_linker(); | |
a3ad94ed | 3046 | gold_assert(interp != NULL); |
dbe717ef ILT |
3047 | } |
3048 | ||
3049 | size_t len = strlen(interp) + 1; | |
3050 | ||
3051 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
3052 | ||
3802b2dd ILT |
3053 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
3054 | elfcpp::SHT_PROGBITS, | |
3055 | elfcpp::SHF_ALLOC, | |
3056 | false); | |
dbe717ef ILT |
3057 | osec->add_output_section_data(odata); |
3058 | ||
1c4f3631 ILT |
3059 | if (!this->script_options_->saw_phdrs_clause()) |
3060 | { | |
3061 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_INTERP, | |
3062 | elfcpp::PF_R); | |
01676dcd | 3063 | oseg->add_output_section(osec, elfcpp::PF_R); |
1c4f3631 | 3064 | } |
dbe717ef ILT |
3065 | } |
3066 | ||
a3ad94ed ILT |
3067 | // Finish the .dynamic section and PT_DYNAMIC segment. |
3068 | ||
3069 | void | |
3070 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 3071 | const Symbol_table* symtab) |
a3ad94ed | 3072 | { |
1c4f3631 ILT |
3073 | if (!this->script_options_->saw_phdrs_clause()) |
3074 | { | |
3075 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, | |
3076 | (elfcpp::PF_R | |
3077 | | elfcpp::PF_W)); | |
01676dcd ILT |
3078 | oseg->add_output_section(this->dynamic_section_, |
3079 | elfcpp::PF_R | elfcpp::PF_W); | |
1c4f3631 | 3080 | } |
a3ad94ed | 3081 | |
16649710 ILT |
3082 | Output_data_dynamic* const odyn = this->dynamic_data_; |
3083 | ||
a3ad94ed ILT |
3084 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
3085 | p != input_objects->dynobj_end(); | |
3086 | ++p) | |
3087 | { | |
3088 | // FIXME: Handle --as-needed. | |
3089 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); | |
3090 | } | |
3091 | ||
8851ecca | 3092 | if (parameters->options().shared()) |
fced7afd | 3093 | { |
e55bde5e | 3094 | const char* soname = parameters->options().soname(); |
fced7afd ILT |
3095 | if (soname != NULL) |
3096 | odyn->add_string(elfcpp::DT_SONAME, soname); | |
3097 | } | |
3098 | ||
a3ad94ed ILT |
3099 | // FIXME: Support --init and --fini. |
3100 | Symbol* sym = symtab->lookup("_init"); | |
14b31740 | 3101 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
3102 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
3103 | ||
3104 | sym = symtab->lookup("_fini"); | |
14b31740 | 3105 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
3106 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
3107 | ||
3108 | // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY. | |
41f542e7 ILT |
3109 | |
3110 | // Add a DT_RPATH entry if needed. | |
e55bde5e | 3111 | const General_options::Dir_list& rpath(parameters->options().rpath()); |
41f542e7 ILT |
3112 | if (!rpath.empty()) |
3113 | { | |
3114 | std::string rpath_val; | |
3115 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
3116 | p != rpath.end(); | |
3117 | ++p) | |
3118 | { | |
3119 | if (rpath_val.empty()) | |
ad2d6943 | 3120 | rpath_val = p->name(); |
41f542e7 ILT |
3121 | else |
3122 | { | |
3123 | // Eliminate duplicates. | |
3124 | General_options::Dir_list::const_iterator q; | |
3125 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 3126 | if (q->name() == p->name()) |
41f542e7 ILT |
3127 | break; |
3128 | if (q == p) | |
3129 | { | |
3130 | rpath_val += ':'; | |
ad2d6943 | 3131 | rpath_val += p->name(); |
41f542e7 ILT |
3132 | } |
3133 | } | |
3134 | } | |
3135 | ||
3136 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
7c414435 DM |
3137 | if (parameters->options().enable_new_dtags()) |
3138 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); | |
41f542e7 | 3139 | } |
4f4c5f80 ILT |
3140 | |
3141 | // Look for text segments that have dynamic relocations. | |
3142 | bool have_textrel = false; | |
4e8fe71f | 3143 | if (!this->script_options_->saw_sections_clause()) |
4f4c5f80 | 3144 | { |
4e8fe71f ILT |
3145 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
3146 | p != this->segment_list_.end(); | |
3147 | ++p) | |
3148 | { | |
3149 | if (((*p)->flags() & elfcpp::PF_W) == 0 | |
3150 | && (*p)->dynamic_reloc_count() > 0) | |
3151 | { | |
3152 | have_textrel = true; | |
3153 | break; | |
3154 | } | |
3155 | } | |
3156 | } | |
3157 | else | |
3158 | { | |
3159 | // We don't know the section -> segment mapping, so we are | |
3160 | // conservative and just look for readonly sections with | |
3161 | // relocations. If those sections wind up in writable segments, | |
3162 | // then we have created an unnecessary DT_TEXTREL entry. | |
3163 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3164 | p != this->section_list_.end(); | |
3165 | ++p) | |
3166 | { | |
3167 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 | |
3168 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 | |
3169 | && ((*p)->dynamic_reloc_count() > 0)) | |
3170 | { | |
3171 | have_textrel = true; | |
3172 | break; | |
3173 | } | |
3174 | } | |
4f4c5f80 ILT |
3175 | } |
3176 | ||
3177 | // Add a DT_FLAGS entry. We add it even if no flags are set so that | |
3178 | // post-link tools can easily modify these flags if desired. | |
3179 | unsigned int flags = 0; | |
3180 | if (have_textrel) | |
6a41d30b ILT |
3181 | { |
3182 | // Add a DT_TEXTREL for compatibility with older loaders. | |
3183 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
3184 | flags |= elfcpp::DF_TEXTREL; | |
3185 | } | |
8851ecca | 3186 | if (parameters->options().shared() && this->has_static_tls()) |
535890bb | 3187 | flags |= elfcpp::DF_STATIC_TLS; |
7be8330a CD |
3188 | if (parameters->options().origin()) |
3189 | flags |= elfcpp::DF_ORIGIN; | |
e1c74d60 ILT |
3190 | if (parameters->options().now()) |
3191 | flags |= elfcpp::DF_BIND_NOW; | |
4f4c5f80 | 3192 | odyn->add_constant(elfcpp::DT_FLAGS, flags); |
7c414435 DM |
3193 | |
3194 | flags = 0; | |
3195 | if (parameters->options().initfirst()) | |
3196 | flags |= elfcpp::DF_1_INITFIRST; | |
3197 | if (parameters->options().interpose()) | |
3198 | flags |= elfcpp::DF_1_INTERPOSE; | |
3199 | if (parameters->options().loadfltr()) | |
3200 | flags |= elfcpp::DF_1_LOADFLTR; | |
3201 | if (parameters->options().nodefaultlib()) | |
3202 | flags |= elfcpp::DF_1_NODEFLIB; | |
3203 | if (parameters->options().nodelete()) | |
3204 | flags |= elfcpp::DF_1_NODELETE; | |
3205 | if (parameters->options().nodlopen()) | |
3206 | flags |= elfcpp::DF_1_NOOPEN; | |
3207 | if (parameters->options().nodump()) | |
3208 | flags |= elfcpp::DF_1_NODUMP; | |
3209 | if (!parameters->options().shared()) | |
3210 | flags &= ~(elfcpp::DF_1_INITFIRST | |
3211 | | elfcpp::DF_1_NODELETE | |
3212 | | elfcpp::DF_1_NOOPEN); | |
7be8330a CD |
3213 | if (parameters->options().origin()) |
3214 | flags |= elfcpp::DF_1_ORIGIN; | |
e1c74d60 ILT |
3215 | if (parameters->options().now()) |
3216 | flags |= elfcpp::DF_1_NOW; | |
7c414435 DM |
3217 | if (flags) |
3218 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); | |
a3ad94ed ILT |
3219 | } |
3220 | ||
dff16297 ILT |
3221 | // The mapping of input section name prefixes to output section names. |
3222 | // In some cases one prefix is itself a prefix of another prefix; in | |
3223 | // such a case the longer prefix must come first. These prefixes are | |
3224 | // based on the GNU linker default ELF linker script. | |
a2fb1b05 | 3225 | |
ead1e424 | 3226 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
dff16297 | 3227 | const Layout::Section_name_mapping Layout::section_name_mapping[] = |
a2fb1b05 | 3228 | { |
dff16297 ILT |
3229 | MAPPING_INIT(".text.", ".text"), |
3230 | MAPPING_INIT(".ctors.", ".ctors"), | |
3231 | MAPPING_INIT(".dtors.", ".dtors"), | |
3232 | MAPPING_INIT(".rodata.", ".rodata"), | |
3233 | MAPPING_INIT(".data.rel.ro.local", ".data.rel.ro.local"), | |
3234 | MAPPING_INIT(".data.rel.ro", ".data.rel.ro"), | |
3235 | MAPPING_INIT(".data.", ".data"), | |
3236 | MAPPING_INIT(".bss.", ".bss"), | |
3237 | MAPPING_INIT(".tdata.", ".tdata"), | |
3238 | MAPPING_INIT(".tbss.", ".tbss"), | |
3239 | MAPPING_INIT(".init_array.", ".init_array"), | |
3240 | MAPPING_INIT(".fini_array.", ".fini_array"), | |
3241 | MAPPING_INIT(".sdata.", ".sdata"), | |
3242 | MAPPING_INIT(".sbss.", ".sbss"), | |
3243 | // FIXME: In the GNU linker, .sbss2 and .sdata2 are handled | |
3244 | // differently depending on whether it is creating a shared library. | |
3245 | MAPPING_INIT(".sdata2.", ".sdata"), | |
3246 | MAPPING_INIT(".sbss2.", ".sbss"), | |
3247 | MAPPING_INIT(".lrodata.", ".lrodata"), | |
3248 | MAPPING_INIT(".ldata.", ".ldata"), | |
3249 | MAPPING_INIT(".lbss.", ".lbss"), | |
3250 | MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"), | |
3251 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"), | |
3252 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"), | |
3253 | MAPPING_INIT(".gnu.linkonce.t.", ".text"), | |
3254 | MAPPING_INIT(".gnu.linkonce.r.", ".rodata"), | |
3255 | MAPPING_INIT(".gnu.linkonce.d.", ".data"), | |
3256 | MAPPING_INIT(".gnu.linkonce.b.", ".bss"), | |
3257 | MAPPING_INIT(".gnu.linkonce.s.", ".sdata"), | |
3258 | MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"), | |
3259 | MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"), | |
3260 | MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"), | |
3261 | MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"), | |
3262 | MAPPING_INIT(".gnu.linkonce.td.", ".tdata"), | |
3263 | MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"), | |
3264 | MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"), | |
3265 | MAPPING_INIT(".gnu.linkonce.l.", ".ldata"), | |
3266 | MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"), | |
1dcd334d DK |
3267 | MAPPING_INIT(".ARM.extab.", ".ARM.extab"), |
3268 | MAPPING_INIT(".gnu.linkonce.armextab.", ".ARM.extab"), | |
3269 | MAPPING_INIT(".ARM.exidx.", ".ARM.exidx"), | |
3270 | MAPPING_INIT(".gnu.linkonce.armexidx.", ".ARM.exidx"), | |
a2fb1b05 ILT |
3271 | }; |
3272 | #undef MAPPING_INIT | |
3273 | ||
dff16297 ILT |
3274 | const int Layout::section_name_mapping_count = |
3275 | (sizeof(Layout::section_name_mapping) | |
3276 | / sizeof(Layout::section_name_mapping[0])); | |
a2fb1b05 | 3277 | |
ead1e424 ILT |
3278 | // Choose the output section name to use given an input section name. |
3279 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
3280 | // length of NAME. | |
3281 | ||
3282 | const char* | |
3283 | Layout::output_section_name(const char* name, size_t* plen) | |
3284 | { | |
af4a8a83 ILT |
3285 | // gcc 4.3 generates the following sorts of section names when it |
3286 | // needs a section name specific to a function: | |
3287 | // .text.FN | |
3288 | // .rodata.FN | |
3289 | // .sdata2.FN | |
3290 | // .data.FN | |
3291 | // .data.rel.FN | |
3292 | // .data.rel.local.FN | |
3293 | // .data.rel.ro.FN | |
3294 | // .data.rel.ro.local.FN | |
3295 | // .sdata.FN | |
3296 | // .bss.FN | |
3297 | // .sbss.FN | |
3298 | // .tdata.FN | |
3299 | // .tbss.FN | |
3300 | ||
3301 | // The GNU linker maps all of those to the part before the .FN, | |
3302 | // except that .data.rel.local.FN is mapped to .data, and | |
3303 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
3304 | // beginning with .data.rel.ro.local are grouped together. | |
3305 | ||
3306 | // For an anonymous namespace, the string FN can contain a '.'. | |
3307 | ||
3308 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
3309 | // GNU linker maps to .rodata. | |
3310 | ||
dff16297 ILT |
3311 | // The .data.rel.ro sections are used with -z relro. The sections |
3312 | // are recognized by name. We use the same names that the GNU | |
3313 | // linker does for these sections. | |
af4a8a83 | 3314 | |
dff16297 ILT |
3315 | // It is hard to handle this in a principled way, so we don't even |
3316 | // try. We use a table of mappings. If the input section name is | |
3317 | // not found in the table, we simply use it as the output section | |
3318 | // name. | |
af4a8a83 | 3319 | |
dff16297 ILT |
3320 | const Section_name_mapping* psnm = section_name_mapping; |
3321 | for (int i = 0; i < section_name_mapping_count; ++i, ++psnm) | |
ead1e424 | 3322 | { |
dff16297 ILT |
3323 | if (strncmp(name, psnm->from, psnm->fromlen) == 0) |
3324 | { | |
3325 | *plen = psnm->tolen; | |
3326 | return psnm->to; | |
3327 | } | |
ead1e424 ILT |
3328 | } |
3329 | ||
ead1e424 ILT |
3330 | return name; |
3331 | } | |
3332 | ||
8a4c0b0d ILT |
3333 | // Check if a comdat group or .gnu.linkonce section with the given |
3334 | // NAME is selected for the link. If there is already a section, | |
1ef4d87f ILT |
3335 | // *KEPT_SECTION is set to point to the existing section and the |
3336 | // function returns false. Otherwise, OBJECT, SHNDX, IS_COMDAT, and | |
3337 | // IS_GROUP_NAME are recorded for this NAME in the layout object, | |
3338 | // *KEPT_SECTION is set to the internal copy and the function returns | |
3339 | // true. | |
a2fb1b05 ILT |
3340 | |
3341 | bool | |
e55bde5e | 3342 | Layout::find_or_add_kept_section(const std::string& name, |
1ef4d87f ILT |
3343 | Relobj* object, |
3344 | unsigned int shndx, | |
3345 | bool is_comdat, | |
3346 | bool is_group_name, | |
8a4c0b0d | 3347 | Kept_section** kept_section) |
a2fb1b05 | 3348 | { |
e55bde5e ILT |
3349 | // It's normal to see a couple of entries here, for the x86 thunk |
3350 | // sections. If we see more than a few, we're linking a C++ | |
3351 | // program, and we resize to get more space to minimize rehashing. | |
3352 | if (this->signatures_.size() > 4 | |
3353 | && !this->resized_signatures_) | |
3354 | { | |
3355 | reserve_unordered_map(&this->signatures_, | |
3356 | this->number_of_input_files_ * 64); | |
3357 | this->resized_signatures_ = true; | |
3358 | } | |
3359 | ||
1ef4d87f ILT |
3360 | Kept_section candidate; |
3361 | std::pair<Signatures::iterator, bool> ins = | |
3362 | this->signatures_.insert(std::make_pair(name, candidate)); | |
a2fb1b05 | 3363 | |
1ef4d87f | 3364 | if (kept_section != NULL) |
8a4c0b0d | 3365 | *kept_section = &ins.first->second; |
a2fb1b05 ILT |
3366 | if (ins.second) |
3367 | { | |
3368 | // This is the first time we've seen this signature. | |
1ef4d87f ILT |
3369 | ins.first->second.set_object(object); |
3370 | ins.first->second.set_shndx(shndx); | |
3371 | if (is_comdat) | |
3372 | ins.first->second.set_is_comdat(); | |
3373 | if (is_group_name) | |
3374 | ins.first->second.set_is_group_name(); | |
a2fb1b05 ILT |
3375 | return true; |
3376 | } | |
3377 | ||
1ef4d87f ILT |
3378 | // We have already seen this signature. |
3379 | ||
3380 | if (ins.first->second.is_group_name()) | |
a2fb1b05 ILT |
3381 | { |
3382 | // We've already seen a real section group with this signature. | |
1ef4d87f ILT |
3383 | // If the kept group is from a plugin object, and we're in the |
3384 | // replacement phase, accept the new one as a replacement. | |
3385 | if (ins.first->second.object() == NULL | |
2756a258 CC |
3386 | && parameters->options().plugins()->in_replacement_phase()) |
3387 | { | |
1ef4d87f ILT |
3388 | ins.first->second.set_object(object); |
3389 | ins.first->second.set_shndx(shndx); | |
2756a258 CC |
3390 | return true; |
3391 | } | |
a2fb1b05 ILT |
3392 | return false; |
3393 | } | |
1ef4d87f | 3394 | else if (is_group_name) |
a2fb1b05 ILT |
3395 | { |
3396 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 3397 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 | 3398 | // a section group, and don't include this section group. |
1ef4d87f | 3399 | ins.first->second.set_is_group_name(); |
a2fb1b05 ILT |
3400 | return false; |
3401 | } | |
3402 | else | |
3403 | { | |
3404 | // We've already seen a linkonce section and this is a linkonce | |
3405 | // section. These don't block each other--this may be the same | |
3406 | // symbol name with different section types. | |
3407 | return true; | |
3408 | } | |
3409 | } | |
3410 | ||
a445fddf ILT |
3411 | // Store the allocated sections into the section list. |
3412 | ||
3413 | void | |
3414 | Layout::get_allocated_sections(Section_list* section_list) const | |
3415 | { | |
3416 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3417 | p != this->section_list_.end(); | |
3418 | ++p) | |
3419 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) | |
3420 | section_list->push_back(*p); | |
3421 | } | |
3422 | ||
3423 | // Create an output segment. | |
3424 | ||
3425 | Output_segment* | |
3426 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
3427 | { | |
8851ecca | 3428 | gold_assert(!parameters->options().relocatable()); |
a445fddf ILT |
3429 | Output_segment* oseg = new Output_segment(type, flags); |
3430 | this->segment_list_.push_back(oseg); | |
2d924fd9 ILT |
3431 | |
3432 | if (type == elfcpp::PT_TLS) | |
3433 | this->tls_segment_ = oseg; | |
3434 | else if (type == elfcpp::PT_GNU_RELRO) | |
3435 | this->relro_segment_ = oseg; | |
3436 | ||
a445fddf ILT |
3437 | return oseg; |
3438 | } | |
3439 | ||
730cdc88 ILT |
3440 | // Write out the Output_sections. Most won't have anything to write, |
3441 | // since most of the data will come from input sections which are | |
3442 | // handled elsewhere. But some Output_sections do have Output_data. | |
3443 | ||
3444 | void | |
3445 | Layout::write_output_sections(Output_file* of) const | |
3446 | { | |
3447 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3448 | p != this->section_list_.end(); | |
3449 | ++p) | |
3450 | { | |
3451 | if (!(*p)->after_input_sections()) | |
3452 | (*p)->write(of); | |
3453 | } | |
3454 | } | |
3455 | ||
61ba1cf9 ILT |
3456 | // Write out data not associated with a section or the symbol table. |
3457 | ||
3458 | void | |
9025d29d | 3459 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 3460 | { |
8851ecca | 3461 | if (!parameters->options().strip_all()) |
a3ad94ed | 3462 | { |
9e2dcb77 ILT |
3463 | const Output_section* symtab_section = this->symtab_section_; |
3464 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3465 | p != this->section_list_.end(); | |
3466 | ++p) | |
a3ad94ed | 3467 | { |
9e2dcb77 ILT |
3468 | if ((*p)->needs_symtab_index()) |
3469 | { | |
3470 | gold_assert(symtab_section != NULL); | |
3471 | unsigned int index = (*p)->symtab_index(); | |
3472 | gold_assert(index > 0 && index != -1U); | |
3473 | off_t off = (symtab_section->offset() | |
3474 | + index * symtab_section->entsize()); | |
d491d34e | 3475 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
9e2dcb77 | 3476 | } |
a3ad94ed ILT |
3477 | } |
3478 | } | |
3479 | ||
3480 | const Output_section* dynsym_section = this->dynsym_section_; | |
3481 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3482 | p != this->section_list_.end(); | |
3483 | ++p) | |
3484 | { | |
3485 | if ((*p)->needs_dynsym_index()) | |
3486 | { | |
3487 | gold_assert(dynsym_section != NULL); | |
3488 | unsigned int index = (*p)->dynsym_index(); | |
3489 | gold_assert(index > 0 && index != -1U); | |
3490 | off_t off = (dynsym_section->offset() | |
3491 | + index * dynsym_section->entsize()); | |
d491d34e | 3492 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
a3ad94ed ILT |
3493 | } |
3494 | } | |
3495 | ||
a3ad94ed | 3496 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
3497 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
3498 | p != this->special_output_list_.end(); | |
3499 | ++p) | |
3500 | (*p)->write(of); | |
3501 | } | |
3502 | ||
730cdc88 ILT |
3503 | // Write out the Output_sections which can only be written after the |
3504 | // input sections are complete. | |
3505 | ||
3506 | void | |
27bc2bce | 3507 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 3508 | { |
27bc2bce | 3509 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
3510 | // file size. Note we finalize the .shstrab last, to allow the |
3511 | // after_input_section sections to modify their section-names before | |
3512 | // writing. | |
17a1d0a9 | 3513 | if (this->any_postprocessing_sections_) |
27bc2bce | 3514 | { |
17a1d0a9 ILT |
3515 | off_t off = this->output_file_size_; |
3516 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); | |
8a4c0b0d | 3517 | |
17a1d0a9 ILT |
3518 | // Now that we've finalized the names, we can finalize the shstrab. |
3519 | off = | |
3520 | this->set_section_offsets(off, | |
3521 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
3522 | ||
3523 | if (off > this->output_file_size_) | |
3524 | { | |
3525 | of->resize(off); | |
3526 | this->output_file_size_ = off; | |
3527 | } | |
27bc2bce ILT |
3528 | } |
3529 | ||
730cdc88 ILT |
3530 | for (Section_list::const_iterator p = this->section_list_.begin(); |
3531 | p != this->section_list_.end(); | |
3532 | ++p) | |
3533 | { | |
3534 | if ((*p)->after_input_sections()) | |
3535 | (*p)->write(of); | |
3536 | } | |
27bc2bce | 3537 | |
27bc2bce | 3538 | this->section_headers_->write(of); |
730cdc88 ILT |
3539 | } |
3540 | ||
8ed814a9 ILT |
3541 | // If the build ID requires computing a checksum, do so here, and |
3542 | // write it out. We compute a checksum over the entire file because | |
3543 | // that is simplest. | |
3544 | ||
3545 | void | |
3546 | Layout::write_build_id(Output_file* of) const | |
3547 | { | |
3548 | if (this->build_id_note_ == NULL) | |
3549 | return; | |
3550 | ||
3551 | const unsigned char* iv = of->get_input_view(0, this->output_file_size_); | |
3552 | ||
3553 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), | |
3554 | this->build_id_note_->data_size()); | |
3555 | ||
3556 | const char* style = parameters->options().build_id(); | |
3557 | if (strcmp(style, "sha1") == 0) | |
3558 | { | |
3559 | sha1_ctx ctx; | |
3560 | sha1_init_ctx(&ctx); | |
3561 | sha1_process_bytes(iv, this->output_file_size_, &ctx); | |
3562 | sha1_finish_ctx(&ctx, ov); | |
3563 | } | |
3564 | else if (strcmp(style, "md5") == 0) | |
3565 | { | |
3566 | md5_ctx ctx; | |
3567 | md5_init_ctx(&ctx); | |
3568 | md5_process_bytes(iv, this->output_file_size_, &ctx); | |
3569 | md5_finish_ctx(&ctx, ov); | |
3570 | } | |
3571 | else | |
3572 | gold_unreachable(); | |
3573 | ||
3574 | of->write_output_view(this->build_id_note_->offset(), | |
3575 | this->build_id_note_->data_size(), | |
3576 | ov); | |
3577 | ||
3578 | of->free_input_view(0, this->output_file_size_, iv); | |
3579 | } | |
3580 | ||
516cb3d0 ILT |
3581 | // Write out a binary file. This is called after the link is |
3582 | // complete. IN is the temporary output file we used to generate the | |
3583 | // ELF code. We simply walk through the segments, read them from | |
3584 | // their file offset in IN, and write them to their load address in | |
3585 | // the output file. FIXME: with a bit more work, we could support | |
3586 | // S-records and/or Intel hex format here. | |
3587 | ||
3588 | void | |
3589 | Layout::write_binary(Output_file* in) const | |
3590 | { | |
e55bde5e | 3591 | gold_assert(parameters->options().oformat_enum() |
bc644c6c | 3592 | == General_options::OBJECT_FORMAT_BINARY); |
516cb3d0 ILT |
3593 | |
3594 | // Get the size of the binary file. | |
3595 | uint64_t max_load_address = 0; | |
3596 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3597 | p != this->segment_list_.end(); | |
3598 | ++p) | |
3599 | { | |
3600 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
3601 | { | |
3602 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); | |
3603 | if (max_paddr > max_load_address) | |
3604 | max_load_address = max_paddr; | |
3605 | } | |
3606 | } | |
3607 | ||
8851ecca | 3608 | Output_file out(parameters->options().output_file_name()); |
516cb3d0 ILT |
3609 | out.open(max_load_address); |
3610 | ||
3611 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3612 | p != this->segment_list_.end(); | |
3613 | ++p) | |
3614 | { | |
3615 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
3616 | { | |
3617 | const unsigned char* vin = in->get_input_view((*p)->offset(), | |
3618 | (*p)->filesz()); | |
3619 | unsigned char* vout = out.get_output_view((*p)->paddr(), | |
3620 | (*p)->filesz()); | |
3621 | memcpy(vout, vin, (*p)->filesz()); | |
3622 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); | |
3623 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); | |
3624 | } | |
3625 | } | |
3626 | ||
3627 | out.close(); | |
3628 | } | |
3629 | ||
7d9e3d98 ILT |
3630 | // Print the output sections to the map file. |
3631 | ||
3632 | void | |
3633 | Layout::print_to_mapfile(Mapfile* mapfile) const | |
3634 | { | |
3635 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3636 | p != this->segment_list_.end(); | |
3637 | ++p) | |
3638 | (*p)->print_sections_to_mapfile(mapfile); | |
3639 | } | |
3640 | ||
ad8f37d1 ILT |
3641 | // Print statistical information to stderr. This is used for --stats. |
3642 | ||
3643 | void | |
3644 | Layout::print_stats() const | |
3645 | { | |
3646 | this->namepool_.print_stats("section name pool"); | |
3647 | this->sympool_.print_stats("output symbol name pool"); | |
3648 | this->dynpool_.print_stats("dynamic name pool"); | |
38c5e8b4 ILT |
3649 | |
3650 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3651 | p != this->section_list_.end(); | |
3652 | ++p) | |
3653 | (*p)->print_merge_stats(); | |
ad8f37d1 ILT |
3654 | } |
3655 | ||
730cdc88 ILT |
3656 | // Write_sections_task methods. |
3657 | ||
3658 | // We can always run this task. | |
3659 | ||
17a1d0a9 ILT |
3660 | Task_token* |
3661 | Write_sections_task::is_runnable() | |
730cdc88 | 3662 | { |
17a1d0a9 | 3663 | return NULL; |
730cdc88 ILT |
3664 | } |
3665 | ||
3666 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
3667 | // when finished. | |
3668 | ||
17a1d0a9 ILT |
3669 | void |
3670 | Write_sections_task::locks(Task_locker* tl) | |
730cdc88 | 3671 | { |
17a1d0a9 ILT |
3672 | tl->add(this, this->output_sections_blocker_); |
3673 | tl->add(this, this->final_blocker_); | |
730cdc88 ILT |
3674 | } |
3675 | ||
3676 | // Run the task--write out the data. | |
3677 | ||
3678 | void | |
3679 | Write_sections_task::run(Workqueue*) | |
3680 | { | |
3681 | this->layout_->write_output_sections(this->of_); | |
3682 | } | |
3683 | ||
61ba1cf9 ILT |
3684 | // Write_data_task methods. |
3685 | ||
3686 | // We can always run this task. | |
3687 | ||
17a1d0a9 ILT |
3688 | Task_token* |
3689 | Write_data_task::is_runnable() | |
61ba1cf9 | 3690 | { |
17a1d0a9 | 3691 | return NULL; |
61ba1cf9 ILT |
3692 | } |
3693 | ||
3694 | // We need to unlock FINAL_BLOCKER when finished. | |
3695 | ||
17a1d0a9 ILT |
3696 | void |
3697 | Write_data_task::locks(Task_locker* tl) | |
61ba1cf9 | 3698 | { |
17a1d0a9 | 3699 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
3700 | } |
3701 | ||
3702 | // Run the task--write out the data. | |
3703 | ||
3704 | void | |
3705 | Write_data_task::run(Workqueue*) | |
3706 | { | |
9025d29d | 3707 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
3708 | } |
3709 | ||
3710 | // Write_symbols_task methods. | |
3711 | ||
3712 | // We can always run this task. | |
3713 | ||
17a1d0a9 ILT |
3714 | Task_token* |
3715 | Write_symbols_task::is_runnable() | |
61ba1cf9 | 3716 | { |
17a1d0a9 | 3717 | return NULL; |
61ba1cf9 ILT |
3718 | } |
3719 | ||
3720 | // We need to unlock FINAL_BLOCKER when finished. | |
3721 | ||
17a1d0a9 ILT |
3722 | void |
3723 | Write_symbols_task::locks(Task_locker* tl) | |
61ba1cf9 | 3724 | { |
17a1d0a9 | 3725 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
3726 | } |
3727 | ||
3728 | // Run the task--write out the symbols. | |
3729 | ||
3730 | void | |
3731 | Write_symbols_task::run(Workqueue*) | |
3732 | { | |
fd9d194f ILT |
3733 | this->symtab_->write_globals(this->sympool_, this->dynpool_, |
3734 | this->layout_->symtab_xindex(), | |
d491d34e | 3735 | this->layout_->dynsym_xindex(), this->of_); |
61ba1cf9 ILT |
3736 | } |
3737 | ||
730cdc88 ILT |
3738 | // Write_after_input_sections_task methods. |
3739 | ||
3740 | // We can only run this task after the input sections have completed. | |
3741 | ||
17a1d0a9 ILT |
3742 | Task_token* |
3743 | Write_after_input_sections_task::is_runnable() | |
730cdc88 ILT |
3744 | { |
3745 | if (this->input_sections_blocker_->is_blocked()) | |
17a1d0a9 ILT |
3746 | return this->input_sections_blocker_; |
3747 | return NULL; | |
730cdc88 ILT |
3748 | } |
3749 | ||
3750 | // We need to unlock FINAL_BLOCKER when finished. | |
3751 | ||
17a1d0a9 ILT |
3752 | void |
3753 | Write_after_input_sections_task::locks(Task_locker* tl) | |
730cdc88 | 3754 | { |
17a1d0a9 | 3755 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
3756 | } |
3757 | ||
3758 | // Run the task. | |
3759 | ||
3760 | void | |
3761 | Write_after_input_sections_task::run(Workqueue*) | |
3762 | { | |
3763 | this->layout_->write_sections_after_input_sections(this->of_); | |
3764 | } | |
3765 | ||
92e059d8 | 3766 | // Close_task_runner methods. |
61ba1cf9 ILT |
3767 | |
3768 | // Run the task--close the file. | |
3769 | ||
3770 | void | |
17a1d0a9 | 3771 | Close_task_runner::run(Workqueue*, const Task*) |
61ba1cf9 | 3772 | { |
8ed814a9 ILT |
3773 | // If we need to compute a checksum for the BUILD if, we do so here. |
3774 | this->layout_->write_build_id(this->of_); | |
3775 | ||
516cb3d0 | 3776 | // If we've been asked to create a binary file, we do so here. |
7cc619c3 | 3777 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
3778 | this->layout_->write_binary(this->of_); |
3779 | ||
61ba1cf9 ILT |
3780 | this->of_->close(); |
3781 | } | |
3782 | ||
a2fb1b05 ILT |
3783 | // Instantiate the templates we need. We could use the configure |
3784 | // script to restrict this to only the ones for implemented targets. | |
3785 | ||
193a53d9 | 3786 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 ILT |
3787 | template |
3788 | Output_section* | |
730cdc88 ILT |
3789 | Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx, |
3790 | const char* name, | |
3791 | const elfcpp::Shdr<32, false>& shdr, | |
3792 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3793 | #endif |
a2fb1b05 | 3794 | |
193a53d9 | 3795 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
3796 | template |
3797 | Output_section* | |
730cdc88 ILT |
3798 | Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx, |
3799 | const char* name, | |
3800 | const elfcpp::Shdr<32, true>& shdr, | |
3801 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3802 | #endif |
a2fb1b05 | 3803 | |
193a53d9 | 3804 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
3805 | template |
3806 | Output_section* | |
730cdc88 ILT |
3807 | Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx, |
3808 | const char* name, | |
3809 | const elfcpp::Shdr<64, false>& shdr, | |
3810 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3811 | #endif |
a2fb1b05 | 3812 | |
193a53d9 | 3813 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
3814 | template |
3815 | Output_section* | |
730cdc88 ILT |
3816 | Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx, |
3817 | const char* name, | |
3818 | const elfcpp::Shdr<64, true>& shdr, | |
3819 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3820 | #endif |
a2fb1b05 | 3821 | |
6a74a719 ILT |
3822 | #ifdef HAVE_TARGET_32_LITTLE |
3823 | template | |
3824 | Output_section* | |
3825 | Layout::layout_reloc<32, false>(Sized_relobj<32, false>* object, | |
3826 | unsigned int reloc_shndx, | |
3827 | const elfcpp::Shdr<32, false>& shdr, | |
3828 | Output_section* data_section, | |
3829 | Relocatable_relocs* rr); | |
3830 | #endif | |
3831 | ||
3832 | #ifdef HAVE_TARGET_32_BIG | |
3833 | template | |
3834 | Output_section* | |
3835 | Layout::layout_reloc<32, true>(Sized_relobj<32, true>* object, | |
3836 | unsigned int reloc_shndx, | |
3837 | const elfcpp::Shdr<32, true>& shdr, | |
3838 | Output_section* data_section, | |
3839 | Relocatable_relocs* rr); | |
3840 | #endif | |
3841 | ||
3842 | #ifdef HAVE_TARGET_64_LITTLE | |
3843 | template | |
3844 | Output_section* | |
3845 | Layout::layout_reloc<64, false>(Sized_relobj<64, false>* object, | |
3846 | unsigned int reloc_shndx, | |
3847 | const elfcpp::Shdr<64, false>& shdr, | |
3848 | Output_section* data_section, | |
3849 | Relocatable_relocs* rr); | |
3850 | #endif | |
3851 | ||
3852 | #ifdef HAVE_TARGET_64_BIG | |
3853 | template | |
3854 | Output_section* | |
3855 | Layout::layout_reloc<64, true>(Sized_relobj<64, true>* object, | |
3856 | unsigned int reloc_shndx, | |
3857 | const elfcpp::Shdr<64, true>& shdr, | |
3858 | Output_section* data_section, | |
3859 | Relocatable_relocs* rr); | |
3860 | #endif | |
3861 | ||
3862 | #ifdef HAVE_TARGET_32_LITTLE | |
3863 | template | |
3864 | void | |
3865 | Layout::layout_group<32, false>(Symbol_table* symtab, | |
3866 | Sized_relobj<32, false>* object, | |
3867 | unsigned int, | |
3868 | const char* group_section_name, | |
3869 | const char* signature, | |
3870 | const elfcpp::Shdr<32, false>& shdr, | |
8825ac63 ILT |
3871 | elfcpp::Elf_Word flags, |
3872 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3873 | #endif |
3874 | ||
3875 | #ifdef HAVE_TARGET_32_BIG | |
3876 | template | |
3877 | void | |
3878 | Layout::layout_group<32, true>(Symbol_table* symtab, | |
3879 | Sized_relobj<32, true>* object, | |
3880 | unsigned int, | |
3881 | const char* group_section_name, | |
3882 | const char* signature, | |
3883 | const elfcpp::Shdr<32, true>& shdr, | |
8825ac63 ILT |
3884 | elfcpp::Elf_Word flags, |
3885 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3886 | #endif |
3887 | ||
3888 | #ifdef HAVE_TARGET_64_LITTLE | |
3889 | template | |
3890 | void | |
3891 | Layout::layout_group<64, false>(Symbol_table* symtab, | |
3892 | Sized_relobj<64, false>* object, | |
3893 | unsigned int, | |
3894 | const char* group_section_name, | |
3895 | const char* signature, | |
3896 | const elfcpp::Shdr<64, false>& shdr, | |
8825ac63 ILT |
3897 | elfcpp::Elf_Word flags, |
3898 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3899 | #endif |
3900 | ||
3901 | #ifdef HAVE_TARGET_64_BIG | |
3902 | template | |
3903 | void | |
3904 | Layout::layout_group<64, true>(Symbol_table* symtab, | |
3905 | Sized_relobj<64, true>* object, | |
3906 | unsigned int, | |
3907 | const char* group_section_name, | |
3908 | const char* signature, | |
3909 | const elfcpp::Shdr<64, true>& shdr, | |
8825ac63 ILT |
3910 | elfcpp::Elf_Word flags, |
3911 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3912 | #endif |
3913 | ||
730cdc88 ILT |
3914 | #ifdef HAVE_TARGET_32_LITTLE |
3915 | template | |
3916 | Output_section* | |
3917 | Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object, | |
3918 | const unsigned char* symbols, | |
3919 | off_t symbols_size, | |
3920 | const unsigned char* symbol_names, | |
3921 | off_t symbol_names_size, | |
3922 | unsigned int shndx, | |
3923 | const elfcpp::Shdr<32, false>& shdr, | |
3924 | unsigned int reloc_shndx, | |
3925 | unsigned int reloc_type, | |
3926 | off_t* off); | |
3927 | #endif | |
3928 | ||
3929 | #ifdef HAVE_TARGET_32_BIG | |
3930 | template | |
3931 | Output_section* | |
3932 | Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object, | |
3933 | const unsigned char* symbols, | |
3934 | off_t symbols_size, | |
3935 | const unsigned char* symbol_names, | |
3936 | off_t symbol_names_size, | |
3937 | unsigned int shndx, | |
3938 | const elfcpp::Shdr<32, true>& shdr, | |
3939 | unsigned int reloc_shndx, | |
3940 | unsigned int reloc_type, | |
3941 | off_t* off); | |
3942 | #endif | |
3943 | ||
3944 | #ifdef HAVE_TARGET_64_LITTLE | |
3945 | template | |
3946 | Output_section* | |
3947 | Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object, | |
3948 | const unsigned char* symbols, | |
3949 | off_t symbols_size, | |
3950 | const unsigned char* symbol_names, | |
3951 | off_t symbol_names_size, | |
3952 | unsigned int shndx, | |
3953 | const elfcpp::Shdr<64, false>& shdr, | |
3954 | unsigned int reloc_shndx, | |
3955 | unsigned int reloc_type, | |
3956 | off_t* off); | |
3957 | #endif | |
3958 | ||
3959 | #ifdef HAVE_TARGET_64_BIG | |
3960 | template | |
3961 | Output_section* | |
3962 | Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object, | |
3963 | const unsigned char* symbols, | |
3964 | off_t symbols_size, | |
3965 | const unsigned char* symbol_names, | |
3966 | off_t symbol_names_size, | |
3967 | unsigned int shndx, | |
3968 | const elfcpp::Shdr<64, true>& shdr, | |
3969 | unsigned int reloc_shndx, | |
3970 | unsigned int reloc_type, | |
3971 | off_t* off); | |
3972 | #endif | |
a2fb1b05 ILT |
3973 | |
3974 | } // End namespace gold. |