Commit | Line | Data |
---|---|---|
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 | ||
92e059d8 | 56 | // Layout_task_runner methods. |
a2fb1b05 ILT |
57 | |
58 | // Lay out the sections. This is called after all the input objects | |
59 | // have been read. | |
60 | ||
61 | void | |
17a1d0a9 | 62 | Layout_task_runner::run(Workqueue* workqueue, const Task* task) |
a2fb1b05 | 63 | { |
12e14209 | 64 | off_t file_size = this->layout_->finalize(this->input_objects_, |
17a1d0a9 | 65 | this->symtab_, |
8851ecca | 66 | this->target_, |
17a1d0a9 | 67 | task); |
61ba1cf9 ILT |
68 | |
69 | // Now we know the final size of the output file and we know where | |
70 | // each piece of information goes. | |
7d9e3d98 ILT |
71 | |
72 | if (this->mapfile_ != NULL) | |
73 | { | |
74 | this->mapfile_->print_discarded_sections(this->input_objects_); | |
75 | this->layout_->print_to_mapfile(this->mapfile_); | |
76 | } | |
77 | ||
8851ecca | 78 | Output_file* of = new Output_file(parameters->options().output_file_name()); |
7cc619c3 | 79 | if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 | 80 | of->set_is_temporary(); |
61ba1cf9 ILT |
81 | of->open(file_size); |
82 | ||
83 | // Queue up the final set of tasks. | |
84 | gold::queue_final_tasks(this->options_, this->input_objects_, | |
12e14209 | 85 | this->symtab_, this->layout_, workqueue, of); |
a2fb1b05 ILT |
86 | } |
87 | ||
88 | // Layout methods. | |
89 | ||
e55bde5e ILT |
90 | Layout::Layout(int number_of_input_files, Script_options* script_options) |
91 | : number_of_input_files_(number_of_input_files), | |
d491d34e ILT |
92 | script_options_(script_options), |
93 | namepool_(), | |
94 | sympool_(), | |
95 | dynpool_(), | |
96 | signatures_(), | |
97 | section_name_map_(), | |
98 | segment_list_(), | |
99 | section_list_(), | |
100 | unattached_section_list_(), | |
d491d34e ILT |
101 | special_output_list_(), |
102 | section_headers_(NULL), | |
103 | tls_segment_(NULL), | |
9f1d377b | 104 | relro_segment_(NULL), |
d491d34e ILT |
105 | symtab_section_(NULL), |
106 | symtab_xindex_(NULL), | |
107 | dynsym_section_(NULL), | |
108 | dynsym_xindex_(NULL), | |
109 | dynamic_section_(NULL), | |
110 | dynamic_data_(NULL), | |
111 | eh_frame_section_(NULL), | |
112 | eh_frame_data_(NULL), | |
113 | added_eh_frame_data_(false), | |
114 | eh_frame_hdr_section_(NULL), | |
115 | build_id_note_(NULL), | |
62b01cb5 ILT |
116 | debug_abbrev_(NULL), |
117 | debug_info_(NULL), | |
d491d34e ILT |
118 | group_signatures_(), |
119 | output_file_size_(-1), | |
e55bde5e | 120 | sections_are_attached_(false), |
35cdfc9a ILT |
121 | input_requires_executable_stack_(false), |
122 | input_with_gnu_stack_note_(false), | |
535890bb | 123 | input_without_gnu_stack_note_(false), |
17a1d0a9 | 124 | has_static_tls_(false), |
e55bde5e | 125 | any_postprocessing_sections_(false), |
3ce2c28e | 126 | resized_signatures_(false), |
1518dc8f | 127 | have_stabstr_section_(false), |
3ce2c28e | 128 | incremental_inputs_(NULL) |
54dc6425 ILT |
129 | { |
130 | // Make space for more than enough segments for a typical file. | |
131 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
132 | this->segment_list_.reserve(12); |
133 | ||
27bc2bce ILT |
134 | // We expect two unattached Output_data objects: the file header and |
135 | // the segment headers. | |
136 | this->special_output_list_.reserve(2); | |
3ce2c28e ILT |
137 | |
138 | // Initialize structure needed for an incremental build. | |
139 | if (parameters->options().incremental()) | |
140 | this->incremental_inputs_ = new Incremental_inputs; | |
f7c8a183 ILT |
141 | |
142 | // The section name pool is worth optimizing in all cases, because | |
143 | // it is small, but there are often overlaps due to .rel sections. | |
144 | this->namepool_.set_optimize(); | |
54dc6425 ILT |
145 | } |
146 | ||
a2fb1b05 ILT |
147 | // Hash a key we use to look up an output section mapping. |
148 | ||
149 | size_t | |
150 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
151 | { | |
f0641a0b | 152 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
153 | } |
154 | ||
02d2ba74 ILT |
155 | // Returns whether the given section is in the list of |
156 | // debug-sections-used-by-some-version-of-gdb. Currently, | |
157 | // we've checked versions of gdb up to and including 6.7.1. | |
158 | ||
159 | static const char* gdb_sections[] = | |
160 | { ".debug_abbrev", | |
161 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
162 | ".debug_frame", | |
163 | ".debug_info", | |
164 | ".debug_line", | |
165 | ".debug_loc", | |
166 | ".debug_macinfo", | |
167 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
168 | ".debug_ranges", | |
169 | ".debug_str", | |
170 | }; | |
171 | ||
62b01cb5 ILT |
172 | static const char* lines_only_debug_sections[] = |
173 | { ".debug_abbrev", | |
174 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
175 | // ".debug_frame", | |
176 | ".debug_info", | |
177 | ".debug_line", | |
178 | // ".debug_loc", | |
179 | // ".debug_macinfo", | |
180 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
181 | // ".debug_ranges", | |
182 | ".debug_str", | |
183 | }; | |
184 | ||
02d2ba74 ILT |
185 | static inline bool |
186 | is_gdb_debug_section(const char* str) | |
187 | { | |
188 | // We can do this faster: binary search or a hashtable. But why bother? | |
189 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) | |
190 | if (strcmp(str, gdb_sections[i]) == 0) | |
191 | return true; | |
192 | return false; | |
193 | } | |
194 | ||
62b01cb5 ILT |
195 | static inline bool |
196 | is_lines_only_debug_section(const char* str) | |
197 | { | |
198 | // We can do this faster: binary search or a hashtable. But why bother? | |
199 | for (size_t i = 0; | |
200 | i < sizeof(lines_only_debug_sections)/sizeof(*lines_only_debug_sections); | |
201 | ++i) | |
202 | if (strcmp(str, lines_only_debug_sections[i]) == 0) | |
203 | return true; | |
204 | return false; | |
205 | } | |
206 | ||
a2fb1b05 ILT |
207 | // Whether to include this section in the link. |
208 | ||
209 | template<int size, bool big_endian> | |
210 | bool | |
730cdc88 | 211 | Layout::include_section(Sized_relobj<size, big_endian>*, const char* name, |
a2fb1b05 ILT |
212 | const elfcpp::Shdr<size, big_endian>& shdr) |
213 | { | |
fd06b4aa CC |
214 | if (shdr.get_sh_flags() & elfcpp::SHF_EXCLUDE) |
215 | return false; | |
216 | ||
a2fb1b05 ILT |
217 | switch (shdr.get_sh_type()) |
218 | { | |
219 | case elfcpp::SHT_NULL: | |
220 | case elfcpp::SHT_SYMTAB: | |
221 | case elfcpp::SHT_DYNSYM: | |
a2fb1b05 ILT |
222 | case elfcpp::SHT_HASH: |
223 | case elfcpp::SHT_DYNAMIC: | |
224 | case elfcpp::SHT_SYMTAB_SHNDX: | |
225 | return false; | |
226 | ||
5cb66f97 ILT |
227 | case elfcpp::SHT_STRTAB: |
228 | // Discard the sections which have special meanings in the ELF | |
229 | // ABI. Keep others (e.g., .stabstr). We could also do this by | |
230 | // checking the sh_link fields of the appropriate sections. | |
231 | return (strcmp(name, ".dynstr") != 0 | |
232 | && strcmp(name, ".strtab") != 0 | |
233 | && strcmp(name, ".shstrtab") != 0); | |
234 | ||
a2fb1b05 ILT |
235 | case elfcpp::SHT_RELA: |
236 | case elfcpp::SHT_REL: | |
237 | case elfcpp::SHT_GROUP: | |
7019cd25 ILT |
238 | // If we are emitting relocations these should be handled |
239 | // elsewhere. | |
8851ecca ILT |
240 | gold_assert(!parameters->options().relocatable() |
241 | && !parameters->options().emit_relocs()); | |
6a74a719 | 242 | return false; |
a2fb1b05 | 243 | |
9e2dcb77 | 244 | case elfcpp::SHT_PROGBITS: |
8851ecca | 245 | if (parameters->options().strip_debug() |
9e2dcb77 ILT |
246 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
247 | { | |
e94cf127 | 248 | if (is_debug_info_section(name)) |
9e2dcb77 ILT |
249 | return false; |
250 | } | |
62b01cb5 ILT |
251 | if (parameters->options().strip_debug_non_line() |
252 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
253 | { | |
254 | // Debugging sections can only be recognized by name. | |
255 | if (is_prefix_of(".debug", name) | |
256 | && !is_lines_only_debug_section(name)) | |
257 | return false; | |
258 | } | |
8851ecca | 259 | if (parameters->options().strip_debug_gdb() |
02d2ba74 ILT |
260 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
261 | { | |
262 | // Debugging sections can only be recognized by name. | |
263 | if (is_prefix_of(".debug", name) | |
264 | && !is_gdb_debug_section(name)) | |
265 | return false; | |
266 | } | |
fd06b4aa CC |
267 | if (parameters->options().strip_lto_sections() |
268 | && !parameters->options().relocatable() | |
269 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
270 | { | |
271 | // Ignore LTO sections containing intermediate code. | |
272 | if (is_prefix_of(".gnu.lto_", name)) | |
273 | return false; | |
274 | } | |
9e2dcb77 ILT |
275 | return true; |
276 | ||
a2fb1b05 | 277 | default: |
a2fb1b05 ILT |
278 | return true; |
279 | } | |
280 | } | |
281 | ||
ead1e424 | 282 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 283 | |
a2fb1b05 | 284 | Output_section* |
ead1e424 | 285 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 286 | { |
a445fddf ILT |
287 | for (Section_list::const_iterator p = this->section_list_.begin(); |
288 | p != this->section_list_.end(); | |
ead1e424 | 289 | ++p) |
a445fddf ILT |
290 | if (strcmp((*p)->name(), name) == 0) |
291 | return *p; | |
ead1e424 ILT |
292 | return NULL; |
293 | } | |
a2fb1b05 | 294 | |
ead1e424 ILT |
295 | // Return an output segment of type TYPE, with segment flags SET set |
296 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 297 | |
ead1e424 ILT |
298 | Output_segment* |
299 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
300 | elfcpp::Elf_Word clear) const | |
301 | { | |
302 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
303 | p != this->segment_list_.end(); | |
304 | ++p) | |
305 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
306 | && ((*p)->flags() & set) == set | |
307 | && ((*p)->flags() & clear) == 0) | |
308 | return *p; | |
309 | return NULL; | |
310 | } | |
a2fb1b05 | 311 | |
ead1e424 | 312 | // Return the output section to use for section NAME with type TYPE |
a445fddf ILT |
313 | // and section flags FLAGS. NAME must be canonicalized in the string |
314 | // pool, and NAME_KEY is the key. | |
a2fb1b05 | 315 | |
ead1e424 | 316 | Output_section* |
f0641a0b ILT |
317 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
318 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags) | |
ead1e424 | 319 | { |
154e0e9a ILT |
320 | elfcpp::Elf_Xword lookup_flags = flags; |
321 | ||
322 | // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine | |
323 | // read-write with read-only sections. Some other ELF linkers do | |
324 | // not do this. FIXME: Perhaps there should be an option | |
325 | // controlling this. | |
326 | lookup_flags &= ~(elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
327 | ||
328 | const Key key(name_key, std::make_pair(type, lookup_flags)); | |
a2fb1b05 ILT |
329 | const std::pair<Key, Output_section*> v(key, NULL); |
330 | std::pair<Section_name_map::iterator, bool> ins( | |
331 | this->section_name_map_.insert(v)); | |
332 | ||
a2fb1b05 | 333 | if (!ins.second) |
ead1e424 | 334 | return ins.first->second; |
a2fb1b05 ILT |
335 | else |
336 | { | |
337 | // This is the first time we've seen this name/type/flags | |
4e2b1697 ILT |
338 | // combination. For compatibility with the GNU linker, we |
339 | // combine sections with contents and zero flags with sections | |
340 | // with non-zero flags. This is a workaround for cases where | |
341 | // assembler code forgets to set section flags. FIXME: Perhaps | |
342 | // there should be an option to control this. | |
15cf077e | 343 | Output_section* os = NULL; |
4e2b1697 ILT |
344 | |
345 | if (type == elfcpp::SHT_PROGBITS) | |
15cf077e | 346 | { |
4e2b1697 ILT |
347 | if (flags == 0) |
348 | { | |
349 | Output_section* same_name = this->find_output_section(name); | |
350 | if (same_name != NULL | |
351 | && same_name->type() == elfcpp::SHT_PROGBITS | |
352 | && (same_name->flags() & elfcpp::SHF_TLS) == 0) | |
353 | os = same_name; | |
354 | } | |
355 | else if ((flags & elfcpp::SHF_TLS) == 0) | |
356 | { | |
357 | elfcpp::Elf_Xword zero_flags = 0; | |
358 | const Key zero_key(name_key, std::make_pair(type, zero_flags)); | |
359 | Section_name_map::iterator p = | |
360 | this->section_name_map_.find(zero_key); | |
361 | if (p != this->section_name_map_.end()) | |
154e0e9a | 362 | os = p->second; |
4e2b1697 | 363 | } |
15cf077e | 364 | } |
4e2b1697 | 365 | |
15cf077e ILT |
366 | if (os == NULL) |
367 | os = this->make_output_section(name, type, flags); | |
a2fb1b05 | 368 | ins.first->second = os; |
ead1e424 | 369 | return os; |
a2fb1b05 | 370 | } |
ead1e424 ILT |
371 | } |
372 | ||
a445fddf ILT |
373 | // Pick the output section to use for section NAME, in input file |
374 | // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a | |
154e0e9a ILT |
375 | // linker created section. IS_INPUT_SECTION is true if we are |
376 | // choosing an output section for an input section found in a input | |
377 | // file. This will return NULL if the input section should be | |
378 | // discarded. | |
a445fddf ILT |
379 | |
380 | Output_section* | |
381 | Layout::choose_output_section(const Relobj* relobj, const char* name, | |
382 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
154e0e9a | 383 | bool is_input_section) |
a445fddf | 384 | { |
154e0e9a ILT |
385 | // We should not see any input sections after we have attached |
386 | // sections to segments. | |
387 | gold_assert(!is_input_section || !this->sections_are_attached_); | |
388 | ||
389 | // Some flags in the input section should not be automatically | |
390 | // copied to the output section. | |
a445fddf ILT |
391 | flags &= ~ (elfcpp::SHF_INFO_LINK |
392 | | elfcpp::SHF_LINK_ORDER | |
393 | | elfcpp::SHF_GROUP | |
394 | | elfcpp::SHF_MERGE | |
395 | | elfcpp::SHF_STRINGS); | |
396 | ||
397 | if (this->script_options_->saw_sections_clause()) | |
398 | { | |
399 | // We are using a SECTIONS clause, so the output section is | |
400 | // chosen based only on the name. | |
401 | ||
402 | Script_sections* ss = this->script_options_->script_sections(); | |
403 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
404 | Output_section** output_section_slot; | |
405 | name = ss->output_section_name(file_name, name, &output_section_slot); | |
406 | if (name == NULL) | |
407 | { | |
408 | // The SECTIONS clause says to discard this input section. | |
409 | return NULL; | |
410 | } | |
411 | ||
412 | // If this is an orphan section--one not mentioned in the linker | |
413 | // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the | |
414 | // default processing below. | |
415 | ||
416 | if (output_section_slot != NULL) | |
417 | { | |
418 | if (*output_section_slot != NULL) | |
154e0e9a | 419 | return *output_section_slot; |
a445fddf ILT |
420 | |
421 | // We don't put sections found in the linker script into | |
422 | // SECTION_NAME_MAP_. That keeps us from getting confused | |
423 | // if an orphan section is mapped to a section with the same | |
424 | // name as one in the linker script. | |
425 | ||
426 | name = this->namepool_.add(name, false, NULL); | |
427 | ||
428 | Output_section* os = this->make_output_section(name, type, flags); | |
429 | os->set_found_in_sections_clause(); | |
430 | *output_section_slot = os; | |
431 | return os; | |
432 | } | |
433 | } | |
434 | ||
435 | // FIXME: Handle SHF_OS_NONCONFORMING somewhere. | |
436 | ||
437 | // Turn NAME from the name of the input section into the name of the | |
438 | // output section. | |
439 | ||
440 | size_t len = strlen(name); | |
401a9a73 CC |
441 | if (is_input_section |
442 | && !this->script_options_->saw_sections_clause() | |
443 | && !parameters->options().relocatable()) | |
a445fddf ILT |
444 | name = Layout::output_section_name(name, &len); |
445 | ||
446 | Stringpool::Key name_key; | |
447 | name = this->namepool_.add_with_length(name, len, true, &name_key); | |
448 | ||
449 | // Find or make the output section. The output section is selected | |
450 | // based on the section name, type, and flags. | |
451 | return this->get_output_section(name, name_key, type, flags); | |
452 | } | |
453 | ||
ead1e424 | 454 | // Return the output section to use for input section SHNDX, with name |
730cdc88 ILT |
455 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
456 | // index of a relocation section which applies to this section, or 0 | |
457 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
458 | // relocation section if there is one. Set *OFF to the offset of this | |
459 | // input section without the output section. Return NULL if the | |
460 | // section should be discarded. Set *OFF to -1 if the section | |
461 | // contents should not be written directly to the output file, but | |
462 | // will instead receive special handling. | |
ead1e424 ILT |
463 | |
464 | template<int size, bool big_endian> | |
465 | Output_section* | |
730cdc88 ILT |
466 | Layout::layout(Sized_relobj<size, big_endian>* object, unsigned int shndx, |
467 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, | |
468 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 | 469 | { |
ef9beddf ILT |
470 | *off = 0; |
471 | ||
ead1e424 ILT |
472 | if (!this->include_section(object, name, shdr)) |
473 | return NULL; | |
474 | ||
6a74a719 ILT |
475 | Output_section* os; |
476 | ||
477 | // In a relocatable link a grouped section must not be combined with | |
478 | // any other sections. | |
8851ecca | 479 | if (parameters->options().relocatable() |
6a74a719 ILT |
480 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
481 | { | |
482 | name = this->namepool_.add(name, true, NULL); | |
483 | os = this->make_output_section(name, shdr.get_sh_type(), | |
484 | shdr.get_sh_flags()); | |
485 | } | |
486 | else | |
487 | { | |
488 | os = this->choose_output_section(object, name, shdr.get_sh_type(), | |
489 | shdr.get_sh_flags(), true); | |
490 | if (os == NULL) | |
491 | return NULL; | |
492 | } | |
a2fb1b05 | 493 | |
2fd32231 ILT |
494 | // By default the GNU linker sorts input sections whose names match |
495 | // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*. The sections | |
496 | // are sorted by name. This is used to implement constructor | |
497 | // priority ordering. We are compatible. | |
498 | if (!this->script_options_->saw_sections_clause() | |
499 | && (is_prefix_of(".ctors.", name) | |
500 | || is_prefix_of(".dtors.", name) | |
501 | || is_prefix_of(".init_array.", name) | |
502 | || is_prefix_of(".fini_array.", name))) | |
503 | os->set_must_sort_attached_input_sections(); | |
504 | ||
a2fb1b05 ILT |
505 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
506 | ||
a445fddf ILT |
507 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx, |
508 | this->script_options_->saw_sections_clause()); | |
a2fb1b05 ILT |
509 | |
510 | return os; | |
511 | } | |
512 | ||
6a74a719 ILT |
513 | // Handle a relocation section when doing a relocatable link. |
514 | ||
515 | template<int size, bool big_endian> | |
516 | Output_section* | |
517 | Layout::layout_reloc(Sized_relobj<size, big_endian>* object, | |
518 | unsigned int, | |
519 | const elfcpp::Shdr<size, big_endian>& shdr, | |
520 | Output_section* data_section, | |
521 | Relocatable_relocs* rr) | |
522 | { | |
8851ecca ILT |
523 | gold_assert(parameters->options().relocatable() |
524 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
525 | |
526 | int sh_type = shdr.get_sh_type(); | |
527 | ||
528 | std::string name; | |
529 | if (sh_type == elfcpp::SHT_REL) | |
530 | name = ".rel"; | |
531 | else if (sh_type == elfcpp::SHT_RELA) | |
532 | name = ".rela"; | |
533 | else | |
534 | gold_unreachable(); | |
535 | name += data_section->name(); | |
536 | ||
537 | Output_section* os = this->choose_output_section(object, name.c_str(), | |
538 | sh_type, | |
539 | shdr.get_sh_flags(), | |
540 | false); | |
541 | ||
542 | os->set_should_link_to_symtab(); | |
543 | os->set_info_section(data_section); | |
544 | ||
545 | Output_section_data* posd; | |
546 | if (sh_type == elfcpp::SHT_REL) | |
547 | { | |
548 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); | |
549 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, | |
550 | size, | |
551 | big_endian>(rr); | |
552 | } | |
553 | else if (sh_type == elfcpp::SHT_RELA) | |
554 | { | |
555 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); | |
556 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, | |
557 | size, | |
558 | big_endian>(rr); | |
559 | } | |
560 | else | |
561 | gold_unreachable(); | |
562 | ||
563 | os->add_output_section_data(posd); | |
564 | rr->set_output_data(posd); | |
565 | ||
566 | return os; | |
567 | } | |
568 | ||
569 | // Handle a group section when doing a relocatable link. | |
570 | ||
571 | template<int size, bool big_endian> | |
572 | void | |
573 | Layout::layout_group(Symbol_table* symtab, | |
574 | Sized_relobj<size, big_endian>* object, | |
575 | unsigned int, | |
576 | const char* group_section_name, | |
577 | const char* signature, | |
578 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
579 | elfcpp::Elf_Word flags, |
580 | std::vector<unsigned int>* shndxes) | |
6a74a719 | 581 | { |
8851ecca | 582 | gold_assert(parameters->options().relocatable()); |
6a74a719 ILT |
583 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
584 | group_section_name = this->namepool_.add(group_section_name, true, NULL); | |
585 | Output_section* os = this->make_output_section(group_section_name, | |
586 | elfcpp::SHT_GROUP, | |
587 | shdr.get_sh_flags()); | |
588 | ||
589 | // We need to find a symbol with the signature in the symbol table. | |
755ab8af | 590 | // If we don't find one now, we need to look again later. |
6a74a719 | 591 | Symbol* sym = symtab->lookup(signature, NULL); |
755ab8af ILT |
592 | if (sym != NULL) |
593 | os->set_info_symndx(sym); | |
594 | else | |
595 | { | |
e55bde5e ILT |
596 | // Reserve some space to minimize reallocations. |
597 | if (this->group_signatures_.empty()) | |
598 | this->group_signatures_.reserve(this->number_of_input_files_ * 16); | |
599 | ||
755ab8af ILT |
600 | // We will wind up using a symbol whose name is the signature. |
601 | // So just put the signature in the symbol name pool to save it. | |
602 | signature = symtab->canonicalize_name(signature); | |
603 | this->group_signatures_.push_back(Group_signature(os, signature)); | |
604 | } | |
6a74a719 ILT |
605 | |
606 | os->set_should_link_to_symtab(); | |
6a74a719 ILT |
607 | os->set_entsize(4); |
608 | ||
609 | section_size_type entry_count = | |
610 | convert_to_section_size_type(shdr.get_sh_size() / 4); | |
611 | Output_section_data* posd = | |
8825ac63 ILT |
612 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
613 | shndxes); | |
6a74a719 ILT |
614 | os->add_output_section_data(posd); |
615 | } | |
616 | ||
730cdc88 ILT |
617 | // Special GNU handling of sections name .eh_frame. They will |
618 | // normally hold exception frame data as defined by the C++ ABI | |
619 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
620 | |
621 | template<int size, bool big_endian> | |
730cdc88 ILT |
622 | Output_section* |
623 | Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object, | |
624 | const unsigned char* symbols, | |
625 | off_t symbols_size, | |
626 | const unsigned char* symbol_names, | |
627 | off_t symbol_names_size, | |
3151305a | 628 | unsigned int shndx, |
3151305a | 629 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
630 | unsigned int reloc_shndx, unsigned int reloc_type, |
631 | off_t* off) | |
3151305a | 632 | { |
730cdc88 | 633 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS); |
1650c4ff | 634 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 | 635 | |
a445fddf ILT |
636 | const char* const name = ".eh_frame"; |
637 | Output_section* os = this->choose_output_section(object, | |
638 | name, | |
639 | elfcpp::SHT_PROGBITS, | |
640 | elfcpp::SHF_ALLOC, | |
641 | false); | |
642 | if (os == NULL) | |
643 | return NULL; | |
730cdc88 | 644 | |
3151305a ILT |
645 | if (this->eh_frame_section_ == NULL) |
646 | { | |
647 | this->eh_frame_section_ = os; | |
730cdc88 | 648 | this->eh_frame_data_ = new Eh_frame(); |
3151305a | 649 | |
e55bde5e | 650 | if (parameters->options().eh_frame_hdr()) |
3151305a | 651 | { |
3151305a | 652 | Output_section* hdr_os = |
a445fddf ILT |
653 | this->choose_output_section(NULL, |
654 | ".eh_frame_hdr", | |
655 | elfcpp::SHT_PROGBITS, | |
656 | elfcpp::SHF_ALLOC, | |
657 | false); | |
3151305a | 658 | |
a445fddf ILT |
659 | if (hdr_os != NULL) |
660 | { | |
661 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, | |
662 | this->eh_frame_data_); | |
663 | hdr_os->add_output_section_data(hdr_posd); | |
3151305a | 664 | |
a445fddf | 665 | hdr_os->set_after_input_sections(); |
730cdc88 | 666 | |
1c4f3631 ILT |
667 | if (!this->script_options_->saw_phdrs_clause()) |
668 | { | |
669 | Output_segment* hdr_oseg; | |
670 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, | |
671 | elfcpp::PF_R); | |
672 | hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R); | |
673 | } | |
730cdc88 | 674 | |
a445fddf ILT |
675 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); |
676 | } | |
3151305a ILT |
677 | } |
678 | } | |
679 | ||
680 | gold_assert(this->eh_frame_section_ == os); | |
681 | ||
730cdc88 ILT |
682 | if (this->eh_frame_data_->add_ehframe_input_section(object, |
683 | symbols, | |
684 | symbols_size, | |
685 | symbol_names, | |
686 | symbol_names_size, | |
687 | shndx, | |
688 | reloc_shndx, | |
689 | reloc_type)) | |
2c38906f | 690 | { |
154e0e9a ILT |
691 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
692 | ||
2c38906f ILT |
693 | // We found a .eh_frame section we are going to optimize, so now |
694 | // we can add the set of optimized sections to the output | |
695 | // section. We need to postpone adding this until we've found a | |
696 | // section we can optimize so that the .eh_frame section in | |
697 | // crtbegin.o winds up at the start of the output section. | |
698 | if (!this->added_eh_frame_data_) | |
699 | { | |
700 | os->add_output_section_data(this->eh_frame_data_); | |
701 | this->added_eh_frame_data_ = true; | |
702 | } | |
703 | *off = -1; | |
704 | } | |
730cdc88 ILT |
705 | else |
706 | { | |
707 | // We couldn't handle this .eh_frame section for some reason. | |
708 | // Add it as a normal section. | |
a445fddf ILT |
709 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); |
710 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx, | |
711 | saw_sections_clause); | |
730cdc88 ILT |
712 | } |
713 | ||
714 | return os; | |
3151305a ILT |
715 | } |
716 | ||
9f1d377b ILT |
717 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
718 | // the output section. | |
ead1e424 | 719 | |
9f1d377b | 720 | Output_section* |
ead1e424 ILT |
721 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
722 | elfcpp::Elf_Xword flags, | |
723 | Output_section_data* posd) | |
724 | { | |
a445fddf ILT |
725 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
726 | false); | |
727 | if (os != NULL) | |
728 | os->add_output_section_data(posd); | |
9f1d377b | 729 | return os; |
ead1e424 ILT |
730 | } |
731 | ||
a2fb1b05 ILT |
732 | // Map section flags to segment flags. |
733 | ||
734 | elfcpp::Elf_Word | |
735 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
736 | { | |
737 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
738 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
739 | ret |= elfcpp::PF_W; | |
740 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
741 | ret |= elfcpp::PF_X; | |
742 | return ret; | |
743 | } | |
744 | ||
96803768 ILT |
745 | // Sometimes we compress sections. This is typically done for |
746 | // sections that are not part of normal program execution (such as | |
747 | // .debug_* sections), and where the readers of these sections know | |
748 | // how to deal with compressed sections. (To make it easier for them, | |
749 | // we will rename the ouput section in such cases from .foo to | |
750 | // .foo.zlib.nnnn, where nnnn is the uncompressed size.) This routine | |
751 | // doesn't say for certain whether we'll compress -- it depends on | |
752 | // commandline options as well -- just whether this section is a | |
753 | // candidate for compression. | |
754 | ||
755 | static bool | |
756 | is_compressible_debug_section(const char* secname) | |
757 | { | |
758 | return (strncmp(secname, ".debug", sizeof(".debug") - 1) == 0); | |
759 | } | |
760 | ||
a2fb1b05 ILT |
761 | // Make a new Output_section, and attach it to segments as |
762 | // appropriate. | |
763 | ||
764 | Output_section* | |
765 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
766 | elfcpp::Elf_Xword flags) | |
767 | { | |
96803768 ILT |
768 | Output_section* os; |
769 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 770 | && strcmp(parameters->options().compress_debug_sections(), "none") != 0 |
96803768 | 771 | && is_compressible_debug_section(name)) |
e55bde5e ILT |
772 | os = new Output_compressed_section(¶meters->options(), name, type, |
773 | flags); | |
62b01cb5 ILT |
774 | |
775 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 776 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
777 | && strcmp(".debug_abbrev", name) == 0) |
778 | { | |
779 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( | |
780 | name, type, flags); | |
781 | if (this->debug_info_) | |
782 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
783 | } | |
784 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 785 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
786 | && strcmp(".debug_info", name) == 0) |
787 | { | |
788 | os = this->debug_info_ = new Output_reduced_debug_info_section( | |
789 | name, type, flags); | |
790 | if (this->debug_abbrev_) | |
791 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
792 | } | |
793 | else | |
96803768 ILT |
794 | os = new Output_section(name, type, flags); |
795 | ||
8a5e3e08 ILT |
796 | parameters->target().new_output_section(os); |
797 | ||
a3ad94ed | 798 | this->section_list_.push_back(os); |
a2fb1b05 | 799 | |
2fd32231 ILT |
800 | // The GNU linker by default sorts some sections by priority, so we |
801 | // do the same. We need to know that this might happen before we | |
802 | // attach any input sections. | |
803 | if (!this->script_options_->saw_sections_clause() | |
804 | && (strcmp(name, ".ctors") == 0 | |
805 | || strcmp(name, ".dtors") == 0 | |
806 | || strcmp(name, ".init_array") == 0 | |
807 | || strcmp(name, ".fini_array") == 0)) | |
808 | os->set_may_sort_attached_input_sections(); | |
809 | ||
9f1d377b ILT |
810 | // With -z relro, we have to recognize the special sections by name. |
811 | // There is no other way. | |
812 | if (!this->script_options_->saw_sections_clause() | |
813 | && parameters->options().relro() | |
814 | && type == elfcpp::SHT_PROGBITS | |
815 | && (flags & elfcpp::SHF_ALLOC) != 0 | |
816 | && (flags & elfcpp::SHF_WRITE) != 0) | |
817 | { | |
818 | if (strcmp(name, ".data.rel.ro") == 0) | |
819 | os->set_is_relro(); | |
820 | else if (strcmp(name, ".data.rel.ro.local") == 0) | |
821 | { | |
822 | os->set_is_relro(); | |
823 | os->set_is_relro_local(); | |
824 | } | |
825 | } | |
826 | ||
1518dc8f ILT |
827 | // Check for .stab*str sections, as .stab* sections need to link to |
828 | // them. | |
829 | if (type == elfcpp::SHT_STRTAB | |
830 | && !this->have_stabstr_section_ | |
831 | && strncmp(name, ".stab", 5) == 0 | |
832 | && strcmp(name + strlen(name) - 3, "str") == 0) | |
833 | this->have_stabstr_section_ = true; | |
834 | ||
154e0e9a ILT |
835 | // If we have already attached the sections to segments, then we |
836 | // need to attach this one now. This happens for sections created | |
837 | // directly by the linker. | |
838 | if (this->sections_are_attached_) | |
839 | this->attach_section_to_segment(os); | |
840 | ||
4e2b1697 ILT |
841 | return os; |
842 | } | |
a445fddf | 843 | |
154e0e9a ILT |
844 | // Attach output sections to segments. This is called after we have |
845 | // seen all the input sections. | |
846 | ||
847 | void | |
848 | Layout::attach_sections_to_segments() | |
849 | { | |
850 | for (Section_list::iterator p = this->section_list_.begin(); | |
851 | p != this->section_list_.end(); | |
852 | ++p) | |
853 | this->attach_section_to_segment(*p); | |
854 | ||
855 | this->sections_are_attached_ = true; | |
856 | } | |
857 | ||
858 | // Attach an output section to a segment. | |
859 | ||
860 | void | |
861 | Layout::attach_section_to_segment(Output_section* os) | |
862 | { | |
863 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
864 | this->unattached_section_list_.push_back(os); | |
865 | else | |
866 | this->attach_allocated_section_to_segment(os); | |
867 | } | |
868 | ||
4e2b1697 | 869 | // Attach an allocated output section to a segment. |
1c4f3631 | 870 | |
4e2b1697 | 871 | void |
154e0e9a | 872 | Layout::attach_allocated_section_to_segment(Output_section* os) |
4e2b1697 | 873 | { |
154e0e9a | 874 | elfcpp::Elf_Xword flags = os->flags(); |
4e2b1697 | 875 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
a2fb1b05 | 876 | |
4e2b1697 ILT |
877 | if (parameters->options().relocatable()) |
878 | return; | |
a2fb1b05 | 879 | |
4e2b1697 ILT |
880 | // If we have a SECTIONS clause, we can't handle the attachment to |
881 | // segments until after we've seen all the sections. | |
882 | if (this->script_options_->saw_sections_clause()) | |
883 | return; | |
a2fb1b05 | 884 | |
4e2b1697 | 885 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
756ac4a8 | 886 | |
4e2b1697 | 887 | // This output section goes into a PT_LOAD segment. |
a2fb1b05 | 888 | |
4e2b1697 | 889 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
a2fb1b05 | 890 | |
4e2b1697 ILT |
891 | // In general the only thing we really care about for PT_LOAD |
892 | // segments is whether or not they are writable, so that is how we | |
8a5e3e08 ILT |
893 | // search for them. Large data sections also go into their own |
894 | // PT_LOAD segment. People who need segments sorted on some other | |
4e2b1697 | 895 | // basis will have to use a linker script. |
a2fb1b05 | 896 | |
4e2b1697 ILT |
897 | Segment_list::const_iterator p; |
898 | for (p = this->segment_list_.begin(); | |
899 | p != this->segment_list_.end(); | |
900 | ++p) | |
901 | { | |
8a5e3e08 ILT |
902 | if ((*p)->type() != elfcpp::PT_LOAD) |
903 | continue; | |
904 | if (!parameters->options().omagic() | |
905 | && ((*p)->flags() & elfcpp::PF_W) != (seg_flags & elfcpp::PF_W)) | |
906 | continue; | |
907 | // If -Tbss was specified, we need to separate the data and BSS | |
908 | // segments. | |
909 | if (parameters->options().user_set_Tbss()) | |
910 | { | |
911 | if ((os->type() == elfcpp::SHT_NOBITS) | |
912 | == (*p)->has_any_data_sections()) | |
913 | continue; | |
914 | } | |
915 | if (os->is_large_data_section() && !(*p)->is_large_data_segment()) | |
916 | continue; | |
4e2b1697 | 917 | |
8a5e3e08 ILT |
918 | (*p)->add_output_section(os, seg_flags); |
919 | break; | |
4e2b1697 | 920 | } |
54dc6425 | 921 | |
4e2b1697 ILT |
922 | if (p == this->segment_list_.end()) |
923 | { | |
924 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, | |
925 | seg_flags); | |
8a5e3e08 ILT |
926 | if (os->is_large_data_section()) |
927 | oseg->set_is_large_data_segment(); | |
4e2b1697 | 928 | oseg->add_output_section(os, seg_flags); |
a2fb1b05 ILT |
929 | } |
930 | ||
4e2b1697 ILT |
931 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
932 | // segment. | |
933 | if (os->type() == elfcpp::SHT_NOTE) | |
934 | { | |
935 | // See if we already have an equivalent PT_NOTE segment. | |
936 | for (p = this->segment_list_.begin(); | |
937 | p != segment_list_.end(); | |
938 | ++p) | |
939 | { | |
940 | if ((*p)->type() == elfcpp::PT_NOTE | |
941 | && (((*p)->flags() & elfcpp::PF_W) | |
942 | == (seg_flags & elfcpp::PF_W))) | |
943 | { | |
944 | (*p)->add_output_section(os, seg_flags); | |
945 | break; | |
946 | } | |
947 | } | |
948 | ||
949 | if (p == this->segment_list_.end()) | |
950 | { | |
951 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, | |
952 | seg_flags); | |
953 | oseg->add_output_section(os, seg_flags); | |
954 | } | |
955 | } | |
956 | ||
957 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
958 | // segment. There can only be one such segment. | |
959 | if ((flags & elfcpp::SHF_TLS) != 0) | |
960 | { | |
961 | if (this->tls_segment_ == NULL) | |
2d924fd9 | 962 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
4e2b1697 ILT |
963 | this->tls_segment_->add_output_section(os, seg_flags); |
964 | } | |
9f1d377b ILT |
965 | |
966 | // If -z relro is in effect, and we see a relro section, we create a | |
967 | // PT_GNU_RELRO segment. There can only be one such segment. | |
968 | if (os->is_relro() && parameters->options().relro()) | |
969 | { | |
970 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); | |
971 | if (this->relro_segment_ == NULL) | |
2d924fd9 | 972 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
9f1d377b ILT |
973 | this->relro_segment_->add_output_section(os, seg_flags); |
974 | } | |
a2fb1b05 ILT |
975 | } |
976 | ||
919ed24c ILT |
977 | // Make an output section for a script. |
978 | ||
979 | Output_section* | |
980 | Layout::make_output_section_for_script(const char* name) | |
981 | { | |
982 | name = this->namepool_.add(name, false, NULL); | |
983 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, | |
984 | elfcpp::SHF_ALLOC); | |
985 | os->set_found_in_sections_clause(); | |
986 | return os; | |
987 | } | |
988 | ||
3802b2dd ILT |
989 | // Return the number of segments we expect to see. |
990 | ||
991 | size_t | |
992 | Layout::expected_segment_count() const | |
993 | { | |
994 | size_t ret = this->segment_list_.size(); | |
995 | ||
996 | // If we didn't see a SECTIONS clause in a linker script, we should | |
997 | // already have the complete list of segments. Otherwise we ask the | |
998 | // SECTIONS clause how many segments it expects, and add in the ones | |
999 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) | |
1000 | ||
1001 | if (!this->script_options_->saw_sections_clause()) | |
1002 | return ret; | |
1003 | else | |
1004 | { | |
1005 | const Script_sections* ss = this->script_options_->script_sections(); | |
1006 | return ret + ss->expected_segment_count(this); | |
1007 | } | |
1008 | } | |
1009 | ||
35cdfc9a ILT |
1010 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
1011 | // is whether we saw a .note.GNU-stack section in the object file. | |
1012 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
1013 | // protection required for stack memory. We record this in an | |
1014 | // executable as a PT_GNU_STACK segment. If an object file does not | |
1015 | // have a .note.GNU-stack segment, we must assume that it is an old | |
1016 | // object. On some targets that will force an executable stack. | |
1017 | ||
1018 | void | |
1019 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags) | |
1020 | { | |
1021 | if (!seen_gnu_stack) | |
1022 | this->input_without_gnu_stack_note_ = true; | |
1023 | else | |
1024 | { | |
1025 | this->input_with_gnu_stack_note_ = true; | |
1026 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
1027 | this->input_requires_executable_stack_ = true; | |
1028 | } | |
1029 | } | |
1030 | ||
a3ad94ed ILT |
1031 | // Create the dynamic sections which are needed before we read the |
1032 | // relocs. | |
1033 | ||
1034 | void | |
9b07f471 | 1035 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
a3ad94ed | 1036 | { |
436ca963 | 1037 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
1038 | return; |
1039 | ||
3802b2dd ILT |
1040 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
1041 | elfcpp::SHT_DYNAMIC, | |
1042 | (elfcpp::SHF_ALLOC | |
1043 | | elfcpp::SHF_WRITE), | |
1044 | false); | |
9f1d377b | 1045 | this->dynamic_section_->set_is_relro(); |
a3ad94ed | 1046 | |
9b07f471 | 1047 | symtab->define_in_output_data("_DYNAMIC", NULL, this->dynamic_section_, 0, 0, |
a3ad94ed ILT |
1048 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, |
1049 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 1050 | |
9025d29d | 1051 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 ILT |
1052 | |
1053 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); | |
a3ad94ed ILT |
1054 | } |
1055 | ||
bfd58944 ILT |
1056 | // For each output section whose name can be represented as C symbol, |
1057 | // define __start and __stop symbols for the section. This is a GNU | |
1058 | // extension. | |
1059 | ||
1060 | void | |
9b07f471 | 1061 | Layout::define_section_symbols(Symbol_table* symtab) |
bfd58944 ILT |
1062 | { |
1063 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1064 | p != this->section_list_.end(); | |
1065 | ++p) | |
1066 | { | |
1067 | const char* const name = (*p)->name(); | |
1068 | if (name[strspn(name, | |
1069 | ("0123456789" | |
1070 | "ABCDEFGHIJKLMNOPWRSTUVWXYZ" | |
1071 | "abcdefghijklmnopqrstuvwxyz" | |
1072 | "_"))] | |
1073 | == '\0') | |
1074 | { | |
1075 | const std::string name_string(name); | |
1076 | const std::string start_name("__start_" + name_string); | |
1077 | const std::string stop_name("__stop_" + name_string); | |
1078 | ||
9b07f471 | 1079 | symtab->define_in_output_data(start_name.c_str(), |
bfd58944 ILT |
1080 | NULL, // version |
1081 | *p, | |
1082 | 0, // value | |
1083 | 0, // symsize | |
1084 | elfcpp::STT_NOTYPE, | |
1085 | elfcpp::STB_GLOBAL, | |
1086 | elfcpp::STV_DEFAULT, | |
1087 | 0, // nonvis | |
1088 | false, // offset_is_from_end | |
a445fddf | 1089 | true); // only_if_ref |
bfd58944 | 1090 | |
9b07f471 | 1091 | symtab->define_in_output_data(stop_name.c_str(), |
bfd58944 ILT |
1092 | NULL, // version |
1093 | *p, | |
1094 | 0, // value | |
1095 | 0, // symsize | |
1096 | elfcpp::STT_NOTYPE, | |
1097 | elfcpp::STB_GLOBAL, | |
1098 | elfcpp::STV_DEFAULT, | |
1099 | 0, // nonvis | |
1100 | true, // offset_is_from_end | |
a445fddf | 1101 | true); // only_if_ref |
bfd58944 ILT |
1102 | } |
1103 | } | |
1104 | } | |
1105 | ||
755ab8af ILT |
1106 | // Define symbols for group signatures. |
1107 | ||
1108 | void | |
1109 | Layout::define_group_signatures(Symbol_table* symtab) | |
1110 | { | |
1111 | for (Group_signatures::iterator p = this->group_signatures_.begin(); | |
1112 | p != this->group_signatures_.end(); | |
1113 | ++p) | |
1114 | { | |
1115 | Symbol* sym = symtab->lookup(p->signature, NULL); | |
1116 | if (sym != NULL) | |
1117 | p->section->set_info_symndx(sym); | |
1118 | else | |
1119 | { | |
1120 | // Force the name of the group section to the group | |
1121 | // signature, and use the group's section symbol as the | |
1122 | // signature symbol. | |
1123 | if (strcmp(p->section->name(), p->signature) != 0) | |
1124 | { | |
1125 | const char* name = this->namepool_.add(p->signature, | |
1126 | true, NULL); | |
1127 | p->section->set_name(name); | |
1128 | } | |
1129 | p->section->set_needs_symtab_index(); | |
1130 | p->section->set_info_section_symndx(p->section); | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | this->group_signatures_.clear(); | |
1135 | } | |
1136 | ||
75f65a3e ILT |
1137 | // Find the first read-only PT_LOAD segment, creating one if |
1138 | // necessary. | |
54dc6425 | 1139 | |
75f65a3e ILT |
1140 | Output_segment* |
1141 | Layout::find_first_load_seg() | |
54dc6425 | 1142 | { |
75f65a3e ILT |
1143 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
1144 | p != this->segment_list_.end(); | |
1145 | ++p) | |
1146 | { | |
1147 | if ((*p)->type() == elfcpp::PT_LOAD | |
1148 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
af6156ef ILT |
1149 | && (parameters->options().omagic() |
1150 | || ((*p)->flags() & elfcpp::PF_W) == 0)) | |
75f65a3e ILT |
1151 | return *p; |
1152 | } | |
1153 | ||
1c4f3631 ILT |
1154 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
1155 | ||
3802b2dd ILT |
1156 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
1157 | elfcpp::PF_R); | |
75f65a3e | 1158 | return load_seg; |
54dc6425 ILT |
1159 | } |
1160 | ||
1161 | // Finalize the layout. When this is called, we have created all the | |
1162 | // output sections and all the output segments which are based on | |
1163 | // input sections. We have several things to do, and we have to do | |
1164 | // them in the right order, so that we get the right results correctly | |
1165 | // and efficiently. | |
1166 | ||
1167 | // 1) Finalize the list of output segments and create the segment | |
1168 | // table header. | |
1169 | ||
1170 | // 2) Finalize the dynamic symbol table and associated sections. | |
1171 | ||
1172 | // 3) Determine the final file offset of all the output segments. | |
1173 | ||
1174 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
1175 | // sections. | |
1176 | ||
75f65a3e ILT |
1177 | // 5) Create the symbol table sections and the section name table |
1178 | // section. | |
1179 | ||
1180 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
1181 | // value and make a final determination of which symbols are going |
1182 | // into the output symbol table. | |
1183 | ||
54dc6425 ILT |
1184 | // 7) Create the section table header. |
1185 | ||
1186 | // 8) Determine the final file offset of all the output sections which | |
1187 | // are not SHF_ALLOC, including the section table header. | |
1188 | ||
1189 | // 9) Finalize the ELF file header. | |
1190 | ||
75f65a3e ILT |
1191 | // This function returns the size of the output file. |
1192 | ||
1193 | off_t | |
17a1d0a9 | 1194 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
8851ecca | 1195 | Target* target, const Task* task) |
54dc6425 | 1196 | { |
7e1edb90 | 1197 | target->finalize_sections(this); |
5a6f7e2d | 1198 | |
17a1d0a9 | 1199 | this->count_local_symbols(task, input_objects); |
7bf1f802 | 1200 | |
35cdfc9a ILT |
1201 | this->create_gold_note(); |
1202 | this->create_executable_stack_info(target); | |
8ed814a9 | 1203 | this->create_build_id(); |
1518dc8f | 1204 | this->link_stabs_sections(); |
4f211c8b | 1205 | |
3802b2dd | 1206 | Output_segment* phdr_seg = NULL; |
8851ecca | 1207 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
54dc6425 | 1208 | { |
dbe717ef ILT |
1209 | // There was a dynamic object in the link. We need to create |
1210 | // some information for the dynamic linker. | |
1211 | ||
3802b2dd ILT |
1212 | // Create the PT_PHDR segment which will hold the program |
1213 | // headers. | |
1c4f3631 ILT |
1214 | if (!this->script_options_->saw_phdrs_clause()) |
1215 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
3802b2dd | 1216 | |
14b31740 ILT |
1217 | // Create the dynamic symbol table, including the hash table. |
1218 | Output_section* dynstr; | |
1219 | std::vector<Symbol*> dynamic_symbols; | |
1220 | unsigned int local_dynamic_count; | |
a5dc0706 ILT |
1221 | Versions versions(*this->script_options()->version_script_info(), |
1222 | &this->dynpool_); | |
9b07f471 | 1223 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
14b31740 ILT |
1224 | &local_dynamic_count, &dynamic_symbols, |
1225 | &versions); | |
dbe717ef ILT |
1226 | |
1227 | // Create the .interp section to hold the name of the | |
1228 | // interpreter, and put it in a PT_INTERP segment. | |
8851ecca | 1229 | if (!parameters->options().shared()) |
96f2030e | 1230 | this->create_interp(target); |
a3ad94ed ILT |
1231 | |
1232 | // Finish the .dynamic section to hold the dynamic data, and put | |
1233 | // it in a PT_DYNAMIC segment. | |
16649710 | 1234 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
1235 | |
1236 | // We should have added everything we need to the dynamic string | |
1237 | // table. | |
1238 | this->dynpool_.set_string_offsets(); | |
1239 | ||
1240 | // Create the version sections. We can't do this until the | |
1241 | // dynamic string table is complete. | |
46fe1623 | 1242 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
14b31740 | 1243 | dynamic_symbols, dynstr); |
54dc6425 | 1244 | } |
3ce2c28e ILT |
1245 | |
1246 | if (this->incremental_inputs_) | |
1247 | { | |
1248 | this->incremental_inputs_->finalize(); | |
1249 | this->create_incremental_info_sections(); | |
1250 | } | |
54dc6425 | 1251 | |
a445fddf ILT |
1252 | // If there is a SECTIONS clause, put all the input sections into |
1253 | // the required order. | |
1254 | Output_segment* load_seg; | |
88dd47ac | 1255 | if (this->script_options_->saw_sections_clause()) |
a445fddf | 1256 | load_seg = this->set_section_addresses_from_script(symtab); |
8851ecca | 1257 | else if (parameters->options().relocatable()) |
88dd47ac | 1258 | load_seg = NULL; |
a445fddf ILT |
1259 | else |
1260 | load_seg = this->find_first_load_seg(); | |
54dc6425 | 1261 | |
e55bde5e ILT |
1262 | if (parameters->options().oformat_enum() |
1263 | != General_options::OBJECT_FORMAT_ELF) | |
516cb3d0 ILT |
1264 | load_seg = NULL; |
1265 | ||
3802b2dd | 1266 | gold_assert(phdr_seg == NULL || load_seg != NULL); |
75f65a3e ILT |
1267 | |
1268 | // Lay out the segment headers. | |
75f65a3e | 1269 | Output_segment_headers* segment_headers; |
8851ecca | 1270 | if (parameters->options().relocatable()) |
6a74a719 ILT |
1271 | segment_headers = NULL; |
1272 | else | |
1273 | { | |
1274 | segment_headers = new Output_segment_headers(this->segment_list_); | |
1275 | if (load_seg != NULL) | |
1276 | load_seg->add_initial_output_data(segment_headers); | |
1277 | if (phdr_seg != NULL) | |
1278 | phdr_seg->add_initial_output_data(segment_headers); | |
1279 | } | |
75f65a3e ILT |
1280 | |
1281 | // Lay out the file header. | |
1282 | Output_file_header* file_header; | |
d391083d | 1283 | file_header = new Output_file_header(target, symtab, segment_headers, |
e55bde5e | 1284 | parameters->options().entry()); |
a445fddf ILT |
1285 | if (load_seg != NULL) |
1286 | load_seg->add_initial_output_data(file_header); | |
1287 | ||
61ba1cf9 | 1288 | this->special_output_list_.push_back(file_header); |
6a74a719 ILT |
1289 | if (segment_headers != NULL) |
1290 | this->special_output_list_.push_back(segment_headers); | |
75f65a3e | 1291 | |
6a74a719 | 1292 | if (this->script_options_->saw_phdrs_clause() |
8851ecca | 1293 | && !parameters->options().relocatable()) |
1c4f3631 ILT |
1294 | { |
1295 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS | |
1296 | // clause in a linker script. | |
1297 | Script_sections* ss = this->script_options_->script_sections(); | |
1298 | ss->put_headers_in_phdrs(file_header, segment_headers); | |
1299 | } | |
1300 | ||
ead1e424 | 1301 | // We set the output section indexes in set_segment_offsets and |
27bc2bce | 1302 | // set_section_indexes. |
ead1e424 ILT |
1303 | unsigned int shndx = 1; |
1304 | ||
1305 | // Set the file offsets of all the segments, and all the sections | |
1306 | // they contain. | |
6a74a719 | 1307 | off_t off; |
8851ecca | 1308 | if (!parameters->options().relocatable()) |
6a74a719 ILT |
1309 | off = this->set_segment_offsets(target, load_seg, &shndx); |
1310 | else | |
1311 | off = this->set_relocatable_section_offsets(file_header, &shndx); | |
75f65a3e | 1312 | |
a9a60db6 ILT |
1313 | // Set the file offsets of all the non-data sections we've seen so |
1314 | // far which don't have to wait for the input sections. We need | |
1315 | // this in order to finalize local symbols in non-allocated | |
1316 | // sections. | |
1317 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); | |
1318 | ||
d491d34e ILT |
1319 | // Set the section indexes of all unallocated sections seen so far, |
1320 | // in case any of them are somehow referenced by a symbol. | |
1321 | shndx = this->set_section_indexes(shndx); | |
1322 | ||
75f65a3e | 1323 | // Create the symbol table sections. |
d491d34e | 1324 | this->create_symtab_sections(input_objects, symtab, shndx, &off); |
7bf1f802 ILT |
1325 | if (!parameters->doing_static_link()) |
1326 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e | 1327 | |
e5756efb ILT |
1328 | // Process any symbol assignments from a linker script. This must |
1329 | // be called after the symbol table has been finalized. | |
1330 | this->script_options_->finalize_symbols(symtab, this); | |
1331 | ||
75f65a3e ILT |
1332 | // Create the .shstrtab section. |
1333 | Output_section* shstrtab_section = this->create_shstrtab(); | |
1334 | ||
a9a60db6 ILT |
1335 | // Set the file offsets of the rest of the non-data sections which |
1336 | // don't have to wait for the input sections. | |
9a0910c3 | 1337 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 | 1338 | |
d491d34e ILT |
1339 | // Now that all sections have been created, set the section indexes |
1340 | // for any sections which haven't been done yet. | |
86887060 | 1341 | shndx = this->set_section_indexes(shndx); |
ead1e424 | 1342 | |
75f65a3e | 1343 | // Create the section table header. |
d491d34e | 1344 | this->create_shdrs(shstrtab_section, &off); |
75f65a3e | 1345 | |
17a1d0a9 ILT |
1346 | // If there are no sections which require postprocessing, we can |
1347 | // handle the section names now, and avoid a resize later. | |
1348 | if (!this->any_postprocessing_sections_) | |
1349 | off = this->set_section_offsets(off, | |
1350 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
1351 | ||
27bc2bce | 1352 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 1353 | |
27bc2bce ILT |
1354 | // Now we know exactly where everything goes in the output file |
1355 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 1356 | Output_data::layout_complete(); |
75f65a3e | 1357 | |
e44fcf3b ILT |
1358 | this->output_file_size_ = off; |
1359 | ||
75f65a3e ILT |
1360 | return off; |
1361 | } | |
1362 | ||
8ed814a9 | 1363 | // Create a note header following the format defined in the ELF ABI. |
ec3f783e ILT |
1364 | // NAME is the name, NOTE_TYPE is the type, SECTION_NAME is the name |
1365 | // of the section to create, DESCSZ is the size of the descriptor. | |
1366 | // ALLOCATE is true if the section should be allocated in memory. | |
1367 | // This returns the new note section. It sets *TRAILING_PADDING to | |
1368 | // the number of trailing zero bytes required. | |
4f211c8b | 1369 | |
8ed814a9 | 1370 | Output_section* |
ef4ab7a8 PP |
1371 | Layout::create_note(const char* name, int note_type, |
1372 | const char* section_name, size_t descsz, | |
8ed814a9 | 1373 | bool allocate, size_t* trailing_padding) |
4f211c8b | 1374 | { |
e2305dc0 ILT |
1375 | // Authorities all agree that the values in a .note field should |
1376 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
1377 | // they differ on what the alignment is for 64-bit binaries. | |
1378 | // The GABI says unambiguously they take 8-byte alignment: | |
1379 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
1380 | // Other documentation says alignment should always be 4 bytes: | |
1381 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
1382 | // GNU ld and GNU readelf both support the latter (at least as of | |
1383 | // version 2.16.91), and glibc always generates the latter for | |
1384 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
1385 | // here. | |
35cdfc9a | 1386 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
8851ecca | 1387 | const int size = parameters->target().get_size(); |
e2305dc0 ILT |
1388 | #else |
1389 | const int size = 32; | |
1390 | #endif | |
4f211c8b ILT |
1391 | |
1392 | // The contents of the .note section. | |
4f211c8b ILT |
1393 | size_t namesz = strlen(name) + 1; |
1394 | size_t aligned_namesz = align_address(namesz, size / 8); | |
4f211c8b | 1395 | size_t aligned_descsz = align_address(descsz, size / 8); |
4f211c8b | 1396 | |
8ed814a9 | 1397 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
4f211c8b | 1398 | |
8ed814a9 ILT |
1399 | unsigned char* buffer = new unsigned char[notehdrsz]; |
1400 | memset(buffer, 0, notehdrsz); | |
4f211c8b | 1401 | |
8851ecca | 1402 | bool is_big_endian = parameters->target().is_big_endian(); |
4f211c8b ILT |
1403 | |
1404 | if (size == 32) | |
1405 | { | |
1406 | if (!is_big_endian) | |
1407 | { | |
1408 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
1409 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
1410 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
1411 | } | |
1412 | else | |
1413 | { | |
1414 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
1415 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
1416 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
1417 | } | |
1418 | } | |
1419 | else if (size == 64) | |
1420 | { | |
1421 | if (!is_big_endian) | |
1422 | { | |
1423 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
1424 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
1425 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
1426 | } | |
1427 | else | |
1428 | { | |
1429 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
1430 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
1431 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
1432 | } | |
1433 | } | |
1434 | else | |
1435 | gold_unreachable(); | |
1436 | ||
1437 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
4f211c8b | 1438 | |
8ed814a9 ILT |
1439 | elfcpp::Elf_Xword flags = 0; |
1440 | if (allocate) | |
1441 | flags = elfcpp::SHF_ALLOC; | |
ec3f783e ILT |
1442 | Output_section* os = this->choose_output_section(NULL, section_name, |
1443 | elfcpp::SHT_NOTE, | |
1444 | flags, false); | |
8ed814a9 | 1445 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, |
7d9e3d98 ILT |
1446 | size / 8, |
1447 | "** note header"); | |
8ed814a9 ILT |
1448 | os->add_output_section_data(posd); |
1449 | ||
1450 | *trailing_padding = aligned_descsz - descsz; | |
1451 | ||
1452 | return os; | |
1453 | } | |
1454 | ||
1455 | // For an executable or shared library, create a note to record the | |
1456 | // version of gold used to create the binary. | |
1457 | ||
1458 | void | |
1459 | Layout::create_gold_note() | |
1460 | { | |
1461 | if (parameters->options().relocatable()) | |
1462 | return; | |
1463 | ||
1464 | std::string desc = std::string("gold ") + gold::get_version_string(); | |
1465 | ||
1466 | size_t trailing_padding; | |
1467 | Output_section *os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, | |
ef4ab7a8 PP |
1468 | ".note.gnu.gold-version", desc.size(), |
1469 | false, &trailing_padding); | |
8ed814a9 ILT |
1470 | |
1471 | Output_section_data* posd = new Output_data_const(desc, 4); | |
4f211c8b | 1472 | os->add_output_section_data(posd); |
8ed814a9 ILT |
1473 | |
1474 | if (trailing_padding > 0) | |
1475 | { | |
7d9e3d98 | 1476 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
1477 | os->add_output_section_data(posd); |
1478 | } | |
4f211c8b ILT |
1479 | } |
1480 | ||
35cdfc9a ILT |
1481 | // Record whether the stack should be executable. This can be set |
1482 | // from the command line using the -z execstack or -z noexecstack | |
1483 | // options. Otherwise, if any input file has a .note.GNU-stack | |
1484 | // section with the SHF_EXECINSTR flag set, the stack should be | |
1485 | // executable. Otherwise, if at least one input file a | |
1486 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
1487 | // section, we use the target default for whether the stack should be | |
1488 | // executable. Otherwise, we don't generate a stack note. When | |
1489 | // generating a object file, we create a .note.GNU-stack section with | |
1490 | // the appropriate marking. When generating an executable or shared | |
1491 | // library, we create a PT_GNU_STACK segment. | |
1492 | ||
1493 | void | |
1494 | Layout::create_executable_stack_info(const Target* target) | |
1495 | { | |
1496 | bool is_stack_executable; | |
e55bde5e ILT |
1497 | if (parameters->options().is_execstack_set()) |
1498 | is_stack_executable = parameters->options().is_stack_executable(); | |
35cdfc9a ILT |
1499 | else if (!this->input_with_gnu_stack_note_) |
1500 | return; | |
1501 | else | |
1502 | { | |
1503 | if (this->input_requires_executable_stack_) | |
1504 | is_stack_executable = true; | |
1505 | else if (this->input_without_gnu_stack_note_) | |
1506 | is_stack_executable = target->is_default_stack_executable(); | |
1507 | else | |
1508 | is_stack_executable = false; | |
1509 | } | |
1510 | ||
8851ecca | 1511 | if (parameters->options().relocatable()) |
35cdfc9a ILT |
1512 | { |
1513 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
1514 | elfcpp::Elf_Xword flags = 0; | |
1515 | if (is_stack_executable) | |
1516 | flags |= elfcpp::SHF_EXECINSTR; | |
1517 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags); | |
1518 | } | |
1519 | else | |
1520 | { | |
1c4f3631 ILT |
1521 | if (this->script_options_->saw_phdrs_clause()) |
1522 | return; | |
35cdfc9a ILT |
1523 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
1524 | if (is_stack_executable) | |
1525 | flags |= elfcpp::PF_X; | |
3802b2dd | 1526 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); |
35cdfc9a ILT |
1527 | } |
1528 | } | |
1529 | ||
8ed814a9 ILT |
1530 | // If --build-id was used, set up the build ID note. |
1531 | ||
1532 | void | |
1533 | Layout::create_build_id() | |
1534 | { | |
1535 | if (!parameters->options().user_set_build_id()) | |
1536 | return; | |
1537 | ||
1538 | const char* style = parameters->options().build_id(); | |
1539 | if (strcmp(style, "none") == 0) | |
1540 | return; | |
1541 | ||
1542 | // Set DESCSZ to the size of the note descriptor. When possible, | |
1543 | // set DESC to the note descriptor contents. | |
1544 | size_t descsz; | |
1545 | std::string desc; | |
1546 | if (strcmp(style, "md5") == 0) | |
1547 | descsz = 128 / 8; | |
1548 | else if (strcmp(style, "sha1") == 0) | |
1549 | descsz = 160 / 8; | |
1550 | else if (strcmp(style, "uuid") == 0) | |
1551 | { | |
1552 | const size_t uuidsz = 128 / 8; | |
1553 | ||
1554 | char buffer[uuidsz]; | |
1555 | memset(buffer, 0, uuidsz); | |
1556 | ||
2a00e4fb | 1557 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
8ed814a9 ILT |
1558 | if (descriptor < 0) |
1559 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), | |
1560 | strerror(errno)); | |
1561 | else | |
1562 | { | |
1563 | ssize_t got = ::read(descriptor, buffer, uuidsz); | |
2a00e4fb | 1564 | release_descriptor(descriptor, true); |
8ed814a9 ILT |
1565 | if (got < 0) |
1566 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); | |
1567 | else if (static_cast<size_t>(got) != uuidsz) | |
1568 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), | |
1569 | uuidsz, got); | |
1570 | } | |
1571 | ||
1572 | desc.assign(buffer, uuidsz); | |
1573 | descsz = uuidsz; | |
1574 | } | |
1575 | else if (strncmp(style, "0x", 2) == 0) | |
1576 | { | |
1577 | hex_init(); | |
1578 | const char* p = style + 2; | |
1579 | while (*p != '\0') | |
1580 | { | |
1581 | if (hex_p(p[0]) && hex_p(p[1])) | |
1582 | { | |
1583 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); | |
1584 | desc += c; | |
1585 | p += 2; | |
1586 | } | |
1587 | else if (*p == '-' || *p == ':') | |
1588 | ++p; | |
1589 | else | |
1590 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), | |
1591 | style); | |
1592 | } | |
1593 | descsz = desc.size(); | |
1594 | } | |
1595 | else | |
1596 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); | |
1597 | ||
1598 | // Create the note. | |
1599 | size_t trailing_padding; | |
1600 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, | |
ef4ab7a8 PP |
1601 | ".note.gnu.build-id", descsz, true, |
1602 | &trailing_padding); | |
8ed814a9 ILT |
1603 | |
1604 | if (!desc.empty()) | |
1605 | { | |
1606 | // We know the value already, so we fill it in now. | |
1607 | gold_assert(desc.size() == descsz); | |
1608 | ||
1609 | Output_section_data* posd = new Output_data_const(desc, 4); | |
1610 | os->add_output_section_data(posd); | |
1611 | ||
1612 | if (trailing_padding != 0) | |
1613 | { | |
7d9e3d98 | 1614 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
1615 | os->add_output_section_data(posd); |
1616 | } | |
1617 | } | |
1618 | else | |
1619 | { | |
1620 | // We need to compute a checksum after we have completed the | |
1621 | // link. | |
1622 | gold_assert(trailing_padding == 0); | |
7d9e3d98 | 1623 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
8ed814a9 ILT |
1624 | os->add_output_section_data(this->build_id_note_); |
1625 | os->set_after_input_sections(); | |
1626 | } | |
1627 | } | |
1628 | ||
1518dc8f ILT |
1629 | // If we have both .stabXX and .stabXXstr sections, then the sh_link |
1630 | // field of the former should point to the latter. I'm not sure who | |
1631 | // started this, but the GNU linker does it, and some tools depend | |
1632 | // upon it. | |
1633 | ||
1634 | void | |
1635 | Layout::link_stabs_sections() | |
1636 | { | |
1637 | if (!this->have_stabstr_section_) | |
1638 | return; | |
1639 | ||
1640 | for (Section_list::iterator p = this->section_list_.begin(); | |
1641 | p != this->section_list_.end(); | |
1642 | ++p) | |
1643 | { | |
1644 | if ((*p)->type() != elfcpp::SHT_STRTAB) | |
1645 | continue; | |
1646 | ||
1647 | const char* name = (*p)->name(); | |
1648 | if (strncmp(name, ".stab", 5) != 0) | |
1649 | continue; | |
1650 | ||
1651 | size_t len = strlen(name); | |
1652 | if (strcmp(name + len - 3, "str") != 0) | |
1653 | continue; | |
1654 | ||
1655 | std::string stab_name(name, len - 3); | |
1656 | Output_section* stab_sec; | |
1657 | stab_sec = this->find_output_section(stab_name.c_str()); | |
1658 | if (stab_sec != NULL) | |
1659 | stab_sec->set_link_section(*p); | |
1660 | } | |
1661 | } | |
1662 | ||
3ce2c28e ILT |
1663 | // Create .gnu_incremental_inputs and .gnu_incremental_strtab sections needed |
1664 | // for the next run of incremental linking to check what has changed. | |
1665 | ||
1666 | void | |
1667 | Layout::create_incremental_info_sections() | |
1668 | { | |
1669 | gold_assert(this->incremental_inputs_ != NULL); | |
1670 | ||
1671 | // Add the .gnu_incremental_inputs section. | |
1672 | const char *incremental_inputs_name = | |
1673 | this->namepool_.add(".gnu_incremental_inputs", false, NULL); | |
1674 | Output_section* inputs_os = | |
1675 | this->make_output_section(incremental_inputs_name, | |
1676 | elfcpp::SHT_GNU_INCREMENTAL_INPUTS, 0); | |
1677 | Output_section_data* posd = | |
1678 | this->incremental_inputs_->create_incremental_inputs_section_data(); | |
1679 | inputs_os->add_output_section_data(posd); | |
1680 | ||
1681 | // Add the .gnu_incremental_strtab section. | |
1682 | const char *incremental_strtab_name = | |
1683 | this->namepool_.add(".gnu_incremental_strtab", false, NULL); | |
1684 | Output_section* strtab_os = this->make_output_section(incremental_strtab_name, | |
1685 | elfcpp::SHT_STRTAB, | |
1686 | 0); | |
1687 | Output_data_strtab* strtab_data = | |
1688 | new Output_data_strtab(this->incremental_inputs_->get_stringpool()); | |
1689 | strtab_os->add_output_section_data(strtab_data); | |
1690 | ||
1691 | inputs_os->set_link_section(strtab_data); | |
1692 | } | |
1693 | ||
75f65a3e ILT |
1694 | // Return whether SEG1 should be before SEG2 in the output file. This |
1695 | // is based entirely on the segment type and flags. When this is | |
1696 | // called the segment addresses has normally not yet been set. | |
1697 | ||
1698 | bool | |
1699 | Layout::segment_precedes(const Output_segment* seg1, | |
1700 | const Output_segment* seg2) | |
1701 | { | |
1702 | elfcpp::Elf_Word type1 = seg1->type(); | |
1703 | elfcpp::Elf_Word type2 = seg2->type(); | |
1704 | ||
1705 | // The single PT_PHDR segment is required to precede any loadable | |
1706 | // segment. We simply make it always first. | |
1707 | if (type1 == elfcpp::PT_PHDR) | |
1708 | { | |
a3ad94ed | 1709 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
1710 | return true; |
1711 | } | |
1712 | if (type2 == elfcpp::PT_PHDR) | |
1713 | return false; | |
1714 | ||
1715 | // The single PT_INTERP segment is required to precede any loadable | |
1716 | // segment. We simply make it always second. | |
1717 | if (type1 == elfcpp::PT_INTERP) | |
1718 | { | |
a3ad94ed | 1719 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
1720 | return true; |
1721 | } | |
1722 | if (type2 == elfcpp::PT_INTERP) | |
1723 | return false; | |
1724 | ||
1725 | // We then put PT_LOAD segments before any other segments. | |
1726 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
1727 | return true; | |
1728 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
1729 | return false; | |
1730 | ||
9f1d377b ILT |
1731 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
1732 | // segment, because that is where the dynamic linker expects to find | |
1733 | // it (this is just for efficiency; other positions would also work | |
1734 | // correctly). | |
1735 | if (type1 == elfcpp::PT_TLS | |
1736 | && type2 != elfcpp::PT_TLS | |
1737 | && type2 != elfcpp::PT_GNU_RELRO) | |
1738 | return false; | |
1739 | if (type2 == elfcpp::PT_TLS | |
1740 | && type1 != elfcpp::PT_TLS | |
1741 | && type1 != elfcpp::PT_GNU_RELRO) | |
1742 | return true; | |
1743 | ||
1744 | // We put the PT_GNU_RELRO segment last, because that is where the | |
1745 | // dynamic linker expects to find it (as with PT_TLS, this is just | |
1746 | // for efficiency). | |
1747 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) | |
92e059d8 | 1748 | return false; |
9f1d377b | 1749 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
92e059d8 ILT |
1750 | return true; |
1751 | ||
75f65a3e ILT |
1752 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
1753 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
1754 | ||
1755 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
1756 | // by the numeric segment type and flags values. There should not | |
1757 | // be more than one segment with the same type and flags. | |
1758 | if (type1 != elfcpp::PT_LOAD) | |
1759 | { | |
1760 | if (type1 != type2) | |
1761 | return type1 < type2; | |
a3ad94ed | 1762 | gold_assert(flags1 != flags2); |
75f65a3e ILT |
1763 | return flags1 < flags2; |
1764 | } | |
1765 | ||
a445fddf ILT |
1766 | // If the addresses are set already, sort by load address. |
1767 | if (seg1->are_addresses_set()) | |
1768 | { | |
1769 | if (!seg2->are_addresses_set()) | |
1770 | return true; | |
1771 | ||
1772 | unsigned int section_count1 = seg1->output_section_count(); | |
1773 | unsigned int section_count2 = seg2->output_section_count(); | |
1774 | if (section_count1 == 0 && section_count2 > 0) | |
1775 | return true; | |
1776 | if (section_count1 > 0 && section_count2 == 0) | |
1777 | return false; | |
1778 | ||
1779 | uint64_t paddr1 = seg1->first_section_load_address(); | |
1780 | uint64_t paddr2 = seg2->first_section_load_address(); | |
1781 | if (paddr1 != paddr2) | |
1782 | return paddr1 < paddr2; | |
1783 | } | |
1784 | else if (seg2->are_addresses_set()) | |
1785 | return false; | |
1786 | ||
8a5e3e08 ILT |
1787 | // A segment which holds large data comes after a segment which does |
1788 | // not hold large data. | |
1789 | if (seg1->is_large_data_segment()) | |
1790 | { | |
1791 | if (!seg2->is_large_data_segment()) | |
1792 | return false; | |
1793 | } | |
1794 | else if (seg2->is_large_data_segment()) | |
1795 | return true; | |
1796 | ||
1797 | // Otherwise, we sort PT_LOAD segments based on the flags. Readonly | |
1798 | // segments come before writable segments. Then writable segments | |
1799 | // with data come before writable segments without data. Then | |
1800 | // executable segments come before non-executable segments. Then | |
1801 | // the unlikely case of a non-readable segment comes before the | |
1802 | // normal case of a readable segment. If there are multiple | |
1803 | // segments with the same type and flags, we require that the | |
1804 | // address be set, and we sort by virtual address and then physical | |
1805 | // address. | |
75f65a3e ILT |
1806 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
1807 | return (flags1 & elfcpp::PF_W) == 0; | |
756ac4a8 ILT |
1808 | if ((flags1 & elfcpp::PF_W) != 0 |
1809 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) | |
1810 | return seg1->has_any_data_sections(); | |
75f65a3e ILT |
1811 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
1812 | return (flags1 & elfcpp::PF_X) != 0; | |
1813 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
1814 | return (flags1 & elfcpp::PF_R) == 0; | |
1815 | ||
a445fddf ILT |
1816 | // We shouldn't get here--we shouldn't create segments which we |
1817 | // can't distinguish. | |
1818 | gold_unreachable(); | |
75f65a3e ILT |
1819 | } |
1820 | ||
8a5e3e08 ILT |
1821 | // Increase OFF so that it is congruent to ADDR modulo ABI_PAGESIZE. |
1822 | ||
1823 | static off_t | |
1824 | align_file_offset(off_t off, uint64_t addr, uint64_t abi_pagesize) | |
1825 | { | |
1826 | uint64_t unsigned_off = off; | |
1827 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) | |
1828 | | (addr & (abi_pagesize - 1))); | |
1829 | if (aligned_off < unsigned_off) | |
1830 | aligned_off += abi_pagesize; | |
1831 | return aligned_off; | |
1832 | } | |
1833 | ||
ead1e424 ILT |
1834 | // Set the file offsets of all the segments, and all the sections they |
1835 | // contain. They have all been created. LOAD_SEG must be be laid out | |
1836 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
1837 | |
1838 | off_t | |
ead1e424 ILT |
1839 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
1840 | unsigned int *pshndx) | |
75f65a3e ILT |
1841 | { |
1842 | // Sort them into the final order. | |
54dc6425 ILT |
1843 | std::sort(this->segment_list_.begin(), this->segment_list_.end(), |
1844 | Layout::Compare_segments()); | |
1845 | ||
75f65a3e ILT |
1846 | // Find the PT_LOAD segments, and set their addresses and offsets |
1847 | // and their section's addresses and offsets. | |
0c5e9c22 | 1848 | uint64_t addr; |
e55bde5e ILT |
1849 | if (parameters->options().user_set_Ttext()) |
1850 | addr = parameters->options().Ttext(); | |
8851ecca | 1851 | else if (parameters->options().shared()) |
a445fddf | 1852 | addr = 0; |
0c5e9c22 ILT |
1853 | else |
1854 | addr = target->default_text_segment_address(); | |
75f65a3e | 1855 | off_t off = 0; |
a445fddf ILT |
1856 | |
1857 | // If LOAD_SEG is NULL, then the file header and segment headers | |
1858 | // will not be loadable. But they still need to be at offset 0 in | |
1859 | // the file. Set their offsets now. | |
1860 | if (load_seg == NULL) | |
1861 | { | |
1862 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
1863 | p != this->special_output_list_.end(); | |
1864 | ++p) | |
1865 | { | |
1866 | off = align_address(off, (*p)->addralign()); | |
1867 | (*p)->set_address_and_file_offset(0, off); | |
1868 | off += (*p)->data_size(); | |
1869 | } | |
1870 | } | |
1871 | ||
34810851 ILT |
1872 | const bool check_sections = parameters->options().check_sections(); |
1873 | Output_segment* last_load_segment = NULL; | |
1874 | ||
75f65a3e ILT |
1875 | bool was_readonly = false; |
1876 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
1877 | p != this->segment_list_.end(); | |
1878 | ++p) | |
1879 | { | |
1880 | if ((*p)->type() == elfcpp::PT_LOAD) | |
1881 | { | |
1882 | if (load_seg != NULL && load_seg != *p) | |
a3ad94ed | 1883 | gold_unreachable(); |
75f65a3e ILT |
1884 | load_seg = NULL; |
1885 | ||
756ac4a8 ILT |
1886 | bool are_addresses_set = (*p)->are_addresses_set(); |
1887 | if (are_addresses_set) | |
1888 | { | |
1889 | // When it comes to setting file offsets, we care about | |
1890 | // the physical address. | |
1891 | addr = (*p)->paddr(); | |
1892 | } | |
e55bde5e | 1893 | else if (parameters->options().user_set_Tdata() |
756ac4a8 | 1894 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
e55bde5e | 1895 | && (!parameters->options().user_set_Tbss() |
756ac4a8 ILT |
1896 | || (*p)->has_any_data_sections())) |
1897 | { | |
e55bde5e | 1898 | addr = parameters->options().Tdata(); |
756ac4a8 ILT |
1899 | are_addresses_set = true; |
1900 | } | |
e55bde5e | 1901 | else if (parameters->options().user_set_Tbss() |
756ac4a8 ILT |
1902 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
1903 | && !(*p)->has_any_data_sections()) | |
1904 | { | |
e55bde5e | 1905 | addr = parameters->options().Tbss(); |
756ac4a8 ILT |
1906 | are_addresses_set = true; |
1907 | } | |
1908 | ||
75f65a3e ILT |
1909 | uint64_t orig_addr = addr; |
1910 | uint64_t orig_off = off; | |
1911 | ||
a445fddf | 1912 | uint64_t aligned_addr = 0; |
75f65a3e | 1913 | uint64_t abi_pagesize = target->abi_pagesize(); |
af6156ef | 1914 | uint64_t common_pagesize = target->common_pagesize(); |
0496d5e5 | 1915 | |
af6156ef ILT |
1916 | if (!parameters->options().nmagic() |
1917 | && !parameters->options().omagic()) | |
1918 | (*p)->set_minimum_p_align(common_pagesize); | |
0496d5e5 | 1919 | |
8a5e3e08 | 1920 | if (!are_addresses_set) |
a445fddf ILT |
1921 | { |
1922 | // If the last segment was readonly, and this one is | |
1923 | // not, then skip the address forward one page, | |
1924 | // maintaining the same position within the page. This | |
1925 | // lets us store both segments overlapping on a single | |
1926 | // page in the file, but the loader will put them on | |
1927 | // different pages in memory. | |
1928 | ||
1929 | addr = align_address(addr, (*p)->maximum_alignment()); | |
75f65a3e | 1930 | aligned_addr = addr; |
a445fddf ILT |
1931 | |
1932 | if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0) | |
1933 | { | |
1934 | if ((addr & (abi_pagesize - 1)) != 0) | |
1935 | addr = addr + abi_pagesize; | |
1936 | } | |
1937 | ||
1938 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); | |
75f65a3e ILT |
1939 | } |
1940 | ||
8a5e3e08 ILT |
1941 | if (!parameters->options().nmagic() |
1942 | && !parameters->options().omagic()) | |
1943 | off = align_file_offset(off, addr, abi_pagesize); | |
1944 | ||
ead1e424 | 1945 | unsigned int shndx_hold = *pshndx; |
96a2b4e4 ILT |
1946 | uint64_t new_addr = (*p)->set_section_addresses(this, false, addr, |
1947 | &off, pshndx); | |
75f65a3e ILT |
1948 | |
1949 | // Now that we know the size of this segment, we may be able | |
1950 | // to save a page in memory, at the cost of wasting some | |
1951 | // file space, by instead aligning to the start of a new | |
1952 | // page. Here we use the real machine page size rather than | |
1953 | // the ABI mandated page size. | |
1954 | ||
a445fddf | 1955 | if (!are_addresses_set && aligned_addr != addr) |
75f65a3e | 1956 | { |
75f65a3e ILT |
1957 | uint64_t first_off = (common_pagesize |
1958 | - (aligned_addr | |
1959 | & (common_pagesize - 1))); | |
1960 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
1961 | if (first_off > 0 | |
1962 | && last_off > 0 | |
1963 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
1964 | != (new_addr & ~ (common_pagesize - 1))) | |
1965 | && first_off + last_off <= common_pagesize) | |
1966 | { | |
ead1e424 ILT |
1967 | *pshndx = shndx_hold; |
1968 | addr = align_address(aligned_addr, common_pagesize); | |
a445fddf | 1969 | addr = align_address(addr, (*p)->maximum_alignment()); |
75f65a3e | 1970 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
8a5e3e08 | 1971 | off = align_file_offset(off, addr, abi_pagesize); |
96a2b4e4 ILT |
1972 | new_addr = (*p)->set_section_addresses(this, true, addr, |
1973 | &off, pshndx); | |
75f65a3e ILT |
1974 | } |
1975 | } | |
1976 | ||
1977 | addr = new_addr; | |
1978 | ||
1979 | if (((*p)->flags() & elfcpp::PF_W) == 0) | |
1980 | was_readonly = true; | |
34810851 ILT |
1981 | |
1982 | // Implement --check-sections. We know that the segments | |
1983 | // are sorted by LMA. | |
1984 | if (check_sections && last_load_segment != NULL) | |
1985 | { | |
1986 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); | |
1987 | if (last_load_segment->paddr() + last_load_segment->memsz() | |
1988 | > (*p)->paddr()) | |
1989 | { | |
1990 | unsigned long long lb1 = last_load_segment->paddr(); | |
1991 | unsigned long long le1 = lb1 + last_load_segment->memsz(); | |
1992 | unsigned long long lb2 = (*p)->paddr(); | |
1993 | unsigned long long le2 = lb2 + (*p)->memsz(); | |
1994 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " | |
1995 | "[0x%llx -> 0x%llx]"), | |
1996 | lb1, le1, lb2, le2); | |
1997 | } | |
1998 | } | |
1999 | last_load_segment = *p; | |
75f65a3e ILT |
2000 | } |
2001 | } | |
2002 | ||
2003 | // Handle the non-PT_LOAD segments, setting their offsets from their | |
2004 | // section's offsets. | |
2005 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
2006 | p != this->segment_list_.end(); | |
2007 | ++p) | |
2008 | { | |
2009 | if ((*p)->type() != elfcpp::PT_LOAD) | |
2010 | (*p)->set_offset(); | |
2011 | } | |
2012 | ||
7bf1f802 ILT |
2013 | // Set the TLS offsets for each section in the PT_TLS segment. |
2014 | if (this->tls_segment_ != NULL) | |
2015 | this->tls_segment_->set_tls_offsets(); | |
2016 | ||
75f65a3e ILT |
2017 | return off; |
2018 | } | |
2019 | ||
6a74a719 ILT |
2020 | // Set the offsets of all the allocated sections when doing a |
2021 | // relocatable link. This does the same jobs as set_segment_offsets, | |
2022 | // only for a relocatable link. | |
2023 | ||
2024 | off_t | |
2025 | Layout::set_relocatable_section_offsets(Output_data* file_header, | |
2026 | unsigned int *pshndx) | |
2027 | { | |
2028 | off_t off = 0; | |
2029 | ||
2030 | file_header->set_address_and_file_offset(0, 0); | |
2031 | off += file_header->data_size(); | |
2032 | ||
2033 | for (Section_list::iterator p = this->section_list_.begin(); | |
2034 | p != this->section_list_.end(); | |
2035 | ++p) | |
2036 | { | |
2037 | // We skip unallocated sections here, except that group sections | |
2038 | // have to come first. | |
2039 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 | |
2040 | && (*p)->type() != elfcpp::SHT_GROUP) | |
2041 | continue; | |
2042 | ||
2043 | off = align_address(off, (*p)->addralign()); | |
2044 | ||
2045 | // The linker script might have set the address. | |
2046 | if (!(*p)->is_address_valid()) | |
2047 | (*p)->set_address(0); | |
2048 | (*p)->set_file_offset(off); | |
2049 | (*p)->finalize_data_size(); | |
2050 | off += (*p)->data_size(); | |
2051 | ||
2052 | (*p)->set_out_shndx(*pshndx); | |
2053 | ++*pshndx; | |
2054 | } | |
2055 | ||
2056 | return off; | |
2057 | } | |
2058 | ||
75f65a3e ILT |
2059 | // Set the file offset of all the sections not associated with a |
2060 | // segment. | |
2061 | ||
2062 | off_t | |
9a0910c3 | 2063 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 2064 | { |
a3ad94ed ILT |
2065 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
2066 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
2067 | ++p) |
2068 | { | |
27bc2bce ILT |
2069 | // The symtab section is handled in create_symtab_sections. |
2070 | if (*p == this->symtab_section_) | |
61ba1cf9 | 2071 | continue; |
27bc2bce | 2072 | |
a9a60db6 ILT |
2073 | // If we've already set the data size, don't set it again. |
2074 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) | |
2075 | continue; | |
2076 | ||
96803768 ILT |
2077 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2078 | && (*p)->requires_postprocessing()) | |
17a1d0a9 ILT |
2079 | { |
2080 | (*p)->create_postprocessing_buffer(); | |
2081 | this->any_postprocessing_sections_ = true; | |
2082 | } | |
96803768 | 2083 | |
9a0910c3 ILT |
2084 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2085 | && (*p)->after_input_sections()) | |
2086 | continue; | |
17a1d0a9 | 2087 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
2088 | && (!(*p)->after_input_sections() |
2089 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
2090 | continue; | |
17a1d0a9 | 2091 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
2092 | && (!(*p)->after_input_sections() |
2093 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
2094 | continue; | |
27bc2bce | 2095 | |
ead1e424 | 2096 | off = align_address(off, (*p)->addralign()); |
27bc2bce ILT |
2097 | (*p)->set_file_offset(off); |
2098 | (*p)->finalize_data_size(); | |
75f65a3e | 2099 | off += (*p)->data_size(); |
96803768 ILT |
2100 | |
2101 | // At this point the name must be set. | |
17a1d0a9 | 2102 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
96803768 | 2103 | this->namepool_.add((*p)->name(), false, NULL); |
75f65a3e ILT |
2104 | } |
2105 | return off; | |
2106 | } | |
2107 | ||
86887060 ILT |
2108 | // Set the section indexes of all the sections not associated with a |
2109 | // segment. | |
2110 | ||
2111 | unsigned int | |
2112 | Layout::set_section_indexes(unsigned int shndx) | |
2113 | { | |
2114 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
2115 | p != this->unattached_section_list_.end(); | |
2116 | ++p) | |
2117 | { | |
d491d34e ILT |
2118 | if (!(*p)->has_out_shndx()) |
2119 | { | |
2120 | (*p)->set_out_shndx(shndx); | |
2121 | ++shndx; | |
2122 | } | |
86887060 ILT |
2123 | } |
2124 | return shndx; | |
2125 | } | |
2126 | ||
a445fddf ILT |
2127 | // Set the section addresses according to the linker script. This is |
2128 | // only called when we see a SECTIONS clause. This returns the | |
2129 | // program segment which should hold the file header and segment | |
2130 | // headers, if any. It will return NULL if they should not be in a | |
2131 | // segment. | |
2132 | ||
2133 | Output_segment* | |
2134 | Layout::set_section_addresses_from_script(Symbol_table* symtab) | |
2135 | { | |
2136 | Script_sections* ss = this->script_options_->script_sections(); | |
2137 | gold_assert(ss->saw_sections_clause()); | |
2138 | ||
2139 | // Place each orphaned output section in the script. | |
2140 | for (Section_list::iterator p = this->section_list_.begin(); | |
2141 | p != this->section_list_.end(); | |
2142 | ++p) | |
2143 | { | |
2144 | if (!(*p)->found_in_sections_clause()) | |
2145 | ss->place_orphan(*p); | |
2146 | } | |
2147 | ||
2148 | return this->script_options_->set_section_addresses(symtab, this); | |
2149 | } | |
2150 | ||
7bf1f802 ILT |
2151 | // Count the local symbols in the regular symbol table and the dynamic |
2152 | // symbol table, and build the respective string pools. | |
2153 | ||
2154 | void | |
17a1d0a9 ILT |
2155 | Layout::count_local_symbols(const Task* task, |
2156 | const Input_objects* input_objects) | |
7bf1f802 | 2157 | { |
6d013333 ILT |
2158 | // First, figure out an upper bound on the number of symbols we'll |
2159 | // be inserting into each pool. This helps us create the pools with | |
2160 | // the right size, to avoid unnecessary hashtable resizing. | |
2161 | unsigned int symbol_count = 0; | |
2162 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2163 | p != input_objects->relobj_end(); | |
2164 | ++p) | |
2165 | symbol_count += (*p)->local_symbol_count(); | |
2166 | ||
2167 | // Go from "upper bound" to "estimate." We overcount for two | |
2168 | // reasons: we double-count symbols that occur in more than one | |
2169 | // object file, and we count symbols that are dropped from the | |
2170 | // output. Add it all together and assume we overcount by 100%. | |
2171 | symbol_count /= 2; | |
2172 | ||
2173 | // We assume all symbols will go into both the sympool and dynpool. | |
2174 | this->sympool_.reserve(symbol_count); | |
2175 | this->dynpool_.reserve(symbol_count); | |
2176 | ||
7bf1f802 ILT |
2177 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2178 | p != input_objects->relobj_end(); | |
2179 | ++p) | |
2180 | { | |
17a1d0a9 | 2181 | Task_lock_obj<Object> tlo(task, *p); |
7bf1f802 ILT |
2182 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
2183 | } | |
2184 | } | |
2185 | ||
b8e6aad9 ILT |
2186 | // Create the symbol table sections. Here we also set the final |
2187 | // values of the symbols. At this point all the loadable sections are | |
d491d34e | 2188 | // fully laid out. SHNUM is the number of sections so far. |
75f65a3e ILT |
2189 | |
2190 | void | |
9025d29d | 2191 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 2192 | Symbol_table* symtab, |
d491d34e | 2193 | unsigned int shnum, |
16649710 | 2194 | off_t* poff) |
75f65a3e | 2195 | { |
61ba1cf9 ILT |
2196 | int symsize; |
2197 | unsigned int align; | |
8851ecca | 2198 | if (parameters->target().get_size() == 32) |
61ba1cf9 ILT |
2199 | { |
2200 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
2201 | align = 4; | |
2202 | } | |
8851ecca | 2203 | else if (parameters->target().get_size() == 64) |
61ba1cf9 ILT |
2204 | { |
2205 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
2206 | align = 8; | |
2207 | } | |
2208 | else | |
a3ad94ed | 2209 | gold_unreachable(); |
61ba1cf9 ILT |
2210 | |
2211 | off_t off = *poff; | |
ead1e424 | 2212 | off = align_address(off, align); |
61ba1cf9 ILT |
2213 | off_t startoff = off; |
2214 | ||
2215 | // Save space for the dummy symbol at the start of the section. We | |
2216 | // never bother to write this out--it will just be left as zero. | |
2217 | off += symsize; | |
c06b7b0b | 2218 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 2219 | |
a3ad94ed ILT |
2220 | // Add STT_SECTION symbols for each Output section which needs one. |
2221 | for (Section_list::iterator p = this->section_list_.begin(); | |
2222 | p != this->section_list_.end(); | |
2223 | ++p) | |
2224 | { | |
2225 | if (!(*p)->needs_symtab_index()) | |
2226 | (*p)->set_symtab_index(-1U); | |
2227 | else | |
2228 | { | |
2229 | (*p)->set_symtab_index(local_symbol_index); | |
2230 | ++local_symbol_index; | |
2231 | off += symsize; | |
2232 | } | |
2233 | } | |
2234 | ||
f6ce93d6 ILT |
2235 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2236 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
2237 | ++p) |
2238 | { | |
c06b7b0b | 2239 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
7bf1f802 | 2240 | off); |
c06b7b0b ILT |
2241 | off += (index - local_symbol_index) * symsize; |
2242 | local_symbol_index = index; | |
75f65a3e ILT |
2243 | } |
2244 | ||
c06b7b0b | 2245 | unsigned int local_symcount = local_symbol_index; |
a3ad94ed | 2246 | gold_assert(local_symcount * symsize == off - startoff); |
61ba1cf9 | 2247 | |
16649710 ILT |
2248 | off_t dynoff; |
2249 | size_t dyn_global_index; | |
2250 | size_t dyncount; | |
2251 | if (this->dynsym_section_ == NULL) | |
2252 | { | |
2253 | dynoff = 0; | |
2254 | dyn_global_index = 0; | |
2255 | dyncount = 0; | |
2256 | } | |
2257 | else | |
2258 | { | |
2259 | dyn_global_index = this->dynsym_section_->info(); | |
2260 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); | |
2261 | dynoff = this->dynsym_section_->offset() + locsize; | |
2262 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 2263 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
2264 | == this->dynsym_section_->data_size() - locsize); |
2265 | } | |
2266 | ||
55a93433 ILT |
2267 | off = symtab->finalize(off, dynoff, dyn_global_index, dyncount, |
2268 | &this->sympool_, &local_symcount); | |
75f65a3e | 2269 | |
8851ecca | 2270 | if (!parameters->options().strip_all()) |
9e2dcb77 ILT |
2271 | { |
2272 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 2273 | |
cfd73a4e | 2274 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
2275 | Output_section* osymtab = this->make_output_section(symtab_name, |
2276 | elfcpp::SHT_SYMTAB, | |
2277 | 0); | |
2278 | this->symtab_section_ = osymtab; | |
a3ad94ed | 2279 | |
27bc2bce | 2280 | Output_section_data* pos = new Output_data_fixed_space(off - startoff, |
7d9e3d98 ILT |
2281 | align, |
2282 | "** symtab"); | |
9e2dcb77 | 2283 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 2284 | |
d491d34e ILT |
2285 | // We generate a .symtab_shndx section if we have more than |
2286 | // SHN_LORESERVE sections. Technically it is possible that we | |
2287 | // don't need one, because it is possible that there are no | |
2288 | // symbols in any of sections with indexes larger than | |
2289 | // SHN_LORESERVE. That is probably unusual, though, and it is | |
2290 | // easier to always create one than to compute section indexes | |
2291 | // twice (once here, once when writing out the symbols). | |
2292 | if (shnum >= elfcpp::SHN_LORESERVE) | |
2293 | { | |
2294 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", | |
2295 | false, NULL); | |
2296 | Output_section* osymtab_xindex = | |
2297 | this->make_output_section(symtab_xindex_name, | |
2298 | elfcpp::SHT_SYMTAB_SHNDX, 0); | |
2299 | ||
2300 | size_t symcount = (off - startoff) / symsize; | |
2301 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); | |
2302 | ||
2303 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); | |
2304 | ||
2305 | osymtab_xindex->set_link_section(osymtab); | |
2306 | osymtab_xindex->set_addralign(4); | |
2307 | osymtab_xindex->set_entsize(4); | |
2308 | ||
2309 | osymtab_xindex->set_after_input_sections(); | |
2310 | ||
2311 | // This tells the driver code to wait until the symbol table | |
2312 | // has written out before writing out the postprocessing | |
2313 | // sections, including the .symtab_shndx section. | |
2314 | this->any_postprocessing_sections_ = true; | |
2315 | } | |
2316 | ||
cfd73a4e | 2317 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
2318 | Output_section* ostrtab = this->make_output_section(strtab_name, |
2319 | elfcpp::SHT_STRTAB, | |
2320 | 0); | |
a3ad94ed | 2321 | |
9e2dcb77 ILT |
2322 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
2323 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 2324 | |
27bc2bce ILT |
2325 | osymtab->set_file_offset(startoff); |
2326 | osymtab->finalize_data_size(); | |
9e2dcb77 ILT |
2327 | osymtab->set_link_section(ostrtab); |
2328 | osymtab->set_info(local_symcount); | |
2329 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 2330 | |
9e2dcb77 ILT |
2331 | *poff = off; |
2332 | } | |
75f65a3e ILT |
2333 | } |
2334 | ||
2335 | // Create the .shstrtab section, which holds the names of the | |
2336 | // sections. At the time this is called, we have created all the | |
2337 | // output sections except .shstrtab itself. | |
2338 | ||
2339 | Output_section* | |
2340 | Layout::create_shstrtab() | |
2341 | { | |
2342 | // FIXME: We don't need to create a .shstrtab section if we are | |
2343 | // stripping everything. | |
2344 | ||
cfd73a4e | 2345 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 2346 | |
a3ad94ed | 2347 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0); |
75f65a3e | 2348 | |
27bc2bce ILT |
2349 | // We can't write out this section until we've set all the section |
2350 | // names, and we don't set the names of compressed output sections | |
2351 | // until relocations are complete. | |
2352 | os->set_after_input_sections(); | |
2353 | ||
a3ad94ed ILT |
2354 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
2355 | os->add_output_section_data(posd); | |
75f65a3e ILT |
2356 | |
2357 | return os; | |
2358 | } | |
2359 | ||
2360 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
2361 | // offset. | |
2362 | ||
27bc2bce | 2363 | void |
d491d34e | 2364 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
75f65a3e ILT |
2365 | { |
2366 | Output_section_headers* oshdrs; | |
9025d29d | 2367 | oshdrs = new Output_section_headers(this, |
16649710 | 2368 | &this->segment_list_, |
6a74a719 | 2369 | &this->section_list_, |
16649710 | 2370 | &this->unattached_section_list_, |
d491d34e ILT |
2371 | &this->namepool_, |
2372 | shstrtab_section); | |
ead1e424 | 2373 | off_t off = align_address(*poff, oshdrs->addralign()); |
27bc2bce | 2374 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 ILT |
2375 | off += oshdrs->data_size(); |
2376 | *poff = off; | |
27bc2bce | 2377 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
2378 | } |
2379 | ||
d491d34e ILT |
2380 | // Count the allocated sections. |
2381 | ||
2382 | size_t | |
2383 | Layout::allocated_output_section_count() const | |
2384 | { | |
2385 | size_t section_count = 0; | |
2386 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
2387 | p != this->segment_list_.end(); | |
2388 | ++p) | |
2389 | section_count += (*p)->output_section_count(); | |
2390 | return section_count; | |
2391 | } | |
2392 | ||
dbe717ef ILT |
2393 | // Create the dynamic symbol table. |
2394 | ||
2395 | void | |
7bf1f802 | 2396 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
9b07f471 | 2397 | Symbol_table* symtab, |
14b31740 ILT |
2398 | Output_section **pdynstr, |
2399 | unsigned int* plocal_dynamic_count, | |
2400 | std::vector<Symbol*>* pdynamic_symbols, | |
2401 | Versions* pversions) | |
dbe717ef | 2402 | { |
a3ad94ed ILT |
2403 | // Count all the symbols in the dynamic symbol table, and set the |
2404 | // dynamic symbol indexes. | |
dbe717ef | 2405 | |
a3ad94ed ILT |
2406 | // Skip symbol 0, which is always all zeroes. |
2407 | unsigned int index = 1; | |
dbe717ef | 2408 | |
a3ad94ed ILT |
2409 | // Add STT_SECTION symbols for each Output section which needs one. |
2410 | for (Section_list::iterator p = this->section_list_.begin(); | |
2411 | p != this->section_list_.end(); | |
2412 | ++p) | |
2413 | { | |
2414 | if (!(*p)->needs_dynsym_index()) | |
2415 | (*p)->set_dynsym_index(-1U); | |
2416 | else | |
2417 | { | |
2418 | (*p)->set_dynsym_index(index); | |
2419 | ++index; | |
2420 | } | |
2421 | } | |
2422 | ||
7bf1f802 ILT |
2423 | // Count the local symbols that need to go in the dynamic symbol table, |
2424 | // and set the dynamic symbol indexes. | |
2425 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2426 | p != input_objects->relobj_end(); | |
2427 | ++p) | |
2428 | { | |
2429 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
2430 | index = new_index; | |
2431 | } | |
a3ad94ed ILT |
2432 | |
2433 | unsigned int local_symcount = index; | |
14b31740 | 2434 | *plocal_dynamic_count = local_symcount; |
a3ad94ed | 2435 | |
9b07f471 | 2436 | index = symtab->set_dynsym_indexes(index, pdynamic_symbols, |
35cdfc9a | 2437 | &this->dynpool_, pversions); |
a3ad94ed ILT |
2438 | |
2439 | int symsize; | |
2440 | unsigned int align; | |
8851ecca | 2441 | const int size = parameters->target().get_size(); |
a3ad94ed ILT |
2442 | if (size == 32) |
2443 | { | |
2444 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
2445 | align = 4; | |
2446 | } | |
2447 | else if (size == 64) | |
2448 | { | |
2449 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
2450 | align = 8; | |
2451 | } | |
2452 | else | |
2453 | gold_unreachable(); | |
2454 | ||
14b31740 ILT |
2455 | // Create the dynamic symbol table section. |
2456 | ||
3802b2dd ILT |
2457 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
2458 | elfcpp::SHT_DYNSYM, | |
2459 | elfcpp::SHF_ALLOC, | |
2460 | false); | |
a3ad94ed | 2461 | |
27bc2bce | 2462 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, |
7d9e3d98 ILT |
2463 | align, |
2464 | "** dynsym"); | |
a3ad94ed ILT |
2465 | dynsym->add_output_section_data(odata); |
2466 | ||
2467 | dynsym->set_info(local_symcount); | |
2468 | dynsym->set_entsize(symsize); | |
2469 | dynsym->set_addralign(align); | |
2470 | ||
2471 | this->dynsym_section_ = dynsym; | |
2472 | ||
16649710 | 2473 | Output_data_dynamic* const odyn = this->dynamic_data_; |
a3ad94ed ILT |
2474 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); |
2475 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
2476 | ||
d491d34e ILT |
2477 | // If there are more than SHN_LORESERVE allocated sections, we |
2478 | // create a .dynsym_shndx section. It is possible that we don't | |
2479 | // need one, because it is possible that there are no dynamic | |
2480 | // symbols in any of the sections with indexes larger than | |
2481 | // SHN_LORESERVE. This is probably unusual, though, and at this | |
2482 | // time we don't know the actual section indexes so it is | |
2483 | // inconvenient to check. | |
2484 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) | |
2485 | { | |
2486 | Output_section* dynsym_xindex = | |
2487 | this->choose_output_section(NULL, ".dynsym_shndx", | |
2488 | elfcpp::SHT_SYMTAB_SHNDX, | |
2489 | elfcpp::SHF_ALLOC, | |
2490 | false); | |
2491 | ||
2492 | this->dynsym_xindex_ = new Output_symtab_xindex(index); | |
2493 | ||
2494 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); | |
2495 | ||
2496 | dynsym_xindex->set_link_section(dynsym); | |
2497 | dynsym_xindex->set_addralign(4); | |
2498 | dynsym_xindex->set_entsize(4); | |
2499 | ||
2500 | dynsym_xindex->set_after_input_sections(); | |
2501 | ||
2502 | // This tells the driver code to wait until the symbol table has | |
2503 | // written out before writing out the postprocessing sections, | |
2504 | // including the .dynsym_shndx section. | |
2505 | this->any_postprocessing_sections_ = true; | |
2506 | } | |
2507 | ||
14b31740 ILT |
2508 | // Create the dynamic string table section. |
2509 | ||
3802b2dd ILT |
2510 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
2511 | elfcpp::SHT_STRTAB, | |
2512 | elfcpp::SHF_ALLOC, | |
2513 | false); | |
a3ad94ed ILT |
2514 | |
2515 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
2516 | dynstr->add_output_section_data(strdata); | |
2517 | ||
16649710 ILT |
2518 | dynsym->set_link_section(dynstr); |
2519 | this->dynamic_section_->set_link_section(dynstr); | |
2520 | ||
a3ad94ed ILT |
2521 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); |
2522 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
2523 | ||
14b31740 ILT |
2524 | *pdynstr = dynstr; |
2525 | ||
2526 | // Create the hash tables. | |
2527 | ||
13670ee6 ILT |
2528 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
2529 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
2530 | { | |
2531 | unsigned char* phash; | |
2532 | unsigned int hashlen; | |
2533 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, | |
2534 | &phash, &hashlen); | |
2535 | ||
2536 | Output_section* hashsec = this->choose_output_section(NULL, ".hash", | |
2537 | elfcpp::SHT_HASH, | |
2538 | elfcpp::SHF_ALLOC, | |
2539 | false); | |
2540 | ||
2541 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
2542 | hashlen, | |
7d9e3d98 ILT |
2543 | align, |
2544 | "** hash"); | |
13670ee6 ILT |
2545 | hashsec->add_output_section_data(hashdata); |
2546 | ||
2547 | hashsec->set_link_section(dynsym); | |
2548 | hashsec->set_entsize(4); | |
a3ad94ed | 2549 | |
13670ee6 ILT |
2550 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); |
2551 | } | |
2552 | ||
2553 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 | |
2554 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
2555 | { | |
2556 | unsigned char* phash; | |
2557 | unsigned int hashlen; | |
2558 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, local_symcount, | |
2559 | &phash, &hashlen); | |
a3ad94ed | 2560 | |
13670ee6 ILT |
2561 | Output_section* hashsec = this->choose_output_section(NULL, ".gnu.hash", |
2562 | elfcpp::SHT_GNU_HASH, | |
2563 | elfcpp::SHF_ALLOC, | |
2564 | false); | |
a3ad94ed | 2565 | |
13670ee6 ILT |
2566 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
2567 | hashlen, | |
7d9e3d98 ILT |
2568 | align, |
2569 | "** hash"); | |
13670ee6 | 2570 | hashsec->add_output_section_data(hashdata); |
a3ad94ed | 2571 | |
13670ee6 ILT |
2572 | hashsec->set_link_section(dynsym); |
2573 | hashsec->set_entsize(4); | |
a3ad94ed | 2574 | |
13670ee6 ILT |
2575 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); |
2576 | } | |
dbe717ef ILT |
2577 | } |
2578 | ||
7bf1f802 ILT |
2579 | // Assign offsets to each local portion of the dynamic symbol table. |
2580 | ||
2581 | void | |
2582 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
2583 | { | |
2584 | Output_section* dynsym = this->dynsym_section_; | |
2585 | gold_assert(dynsym != NULL); | |
2586 | ||
2587 | off_t off = dynsym->offset(); | |
2588 | ||
2589 | // Skip the dummy symbol at the start of the section. | |
2590 | off += dynsym->entsize(); | |
2591 | ||
2592 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2593 | p != input_objects->relobj_end(); | |
2594 | ++p) | |
2595 | { | |
2596 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
2597 | off += count * dynsym->entsize(); | |
2598 | } | |
2599 | } | |
2600 | ||
14b31740 ILT |
2601 | // Create the version sections. |
2602 | ||
2603 | void | |
9025d29d | 2604 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 2605 | const Symbol_table* symtab, |
14b31740 ILT |
2606 | unsigned int local_symcount, |
2607 | const std::vector<Symbol*>& dynamic_symbols, | |
2608 | const Output_section* dynstr) | |
2609 | { | |
2610 | if (!versions->any_defs() && !versions->any_needs()) | |
2611 | return; | |
2612 | ||
8851ecca | 2613 | switch (parameters->size_and_endianness()) |
14b31740 | 2614 | { |
193a53d9 | 2615 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2616 | case Parameters::TARGET_32_LITTLE: |
7d1a9ebb ILT |
2617 | this->sized_create_version_sections<32, false>(versions, symtab, |
2618 | local_symcount, | |
2619 | dynamic_symbols, dynstr); | |
8851ecca | 2620 | break; |
193a53d9 | 2621 | #endif |
8851ecca ILT |
2622 | #ifdef HAVE_TARGET_32_BIG |
2623 | case Parameters::TARGET_32_BIG: | |
7d1a9ebb ILT |
2624 | this->sized_create_version_sections<32, true>(versions, symtab, |
2625 | local_symcount, | |
2626 | dynamic_symbols, dynstr); | |
8851ecca | 2627 | break; |
193a53d9 | 2628 | #endif |
193a53d9 | 2629 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2630 | case Parameters::TARGET_64_LITTLE: |
7d1a9ebb ILT |
2631 | this->sized_create_version_sections<64, false>(versions, symtab, |
2632 | local_symcount, | |
2633 | dynamic_symbols, dynstr); | |
8851ecca | 2634 | break; |
193a53d9 | 2635 | #endif |
8851ecca ILT |
2636 | #ifdef HAVE_TARGET_64_BIG |
2637 | case Parameters::TARGET_64_BIG: | |
7d1a9ebb ILT |
2638 | this->sized_create_version_sections<64, true>(versions, symtab, |
2639 | local_symcount, | |
2640 | dynamic_symbols, dynstr); | |
8851ecca ILT |
2641 | break; |
2642 | #endif | |
2643 | default: | |
2644 | gold_unreachable(); | |
14b31740 | 2645 | } |
14b31740 ILT |
2646 | } |
2647 | ||
2648 | // Create the version sections, sized version. | |
2649 | ||
2650 | template<int size, bool big_endian> | |
2651 | void | |
2652 | Layout::sized_create_version_sections( | |
2653 | const Versions* versions, | |
46fe1623 | 2654 | const Symbol_table* symtab, |
14b31740 ILT |
2655 | unsigned int local_symcount, |
2656 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 2657 | const Output_section* dynstr) |
14b31740 | 2658 | { |
3802b2dd ILT |
2659 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
2660 | elfcpp::SHT_GNU_versym, | |
2661 | elfcpp::SHF_ALLOC, | |
2662 | false); | |
14b31740 ILT |
2663 | |
2664 | unsigned char* vbuf; | |
2665 | unsigned int vsize; | |
7d1a9ebb ILT |
2666 | versions->symbol_section_contents<size, big_endian>(symtab, &this->dynpool_, |
2667 | local_symcount, | |
2668 | dynamic_symbols, | |
2669 | &vbuf, &vsize); | |
14b31740 | 2670 | |
7d9e3d98 ILT |
2671 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, |
2672 | "** versions"); | |
14b31740 ILT |
2673 | |
2674 | vsec->add_output_section_data(vdata); | |
2675 | vsec->set_entsize(2); | |
2676 | vsec->set_link_section(this->dynsym_section_); | |
2677 | ||
2678 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
2679 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
2680 | ||
2681 | if (versions->any_defs()) | |
2682 | { | |
3802b2dd ILT |
2683 | Output_section* vdsec; |
2684 | vdsec= this->choose_output_section(NULL, ".gnu.version_d", | |
2685 | elfcpp::SHT_GNU_verdef, | |
2686 | elfcpp::SHF_ALLOC, | |
2687 | false); | |
14b31740 ILT |
2688 | |
2689 | unsigned char* vdbuf; | |
2690 | unsigned int vdsize; | |
2691 | unsigned int vdentries; | |
7d1a9ebb ILT |
2692 | versions->def_section_contents<size, big_endian>(&this->dynpool_, &vdbuf, |
2693 | &vdsize, &vdentries); | |
14b31740 | 2694 | |
7d9e3d98 ILT |
2695 | Output_section_data* vddata = |
2696 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); | |
14b31740 ILT |
2697 | |
2698 | vdsec->add_output_section_data(vddata); | |
2699 | vdsec->set_link_section(dynstr); | |
2700 | vdsec->set_info(vdentries); | |
2701 | ||
2702 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
2703 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
2704 | } | |
2705 | ||
2706 | if (versions->any_needs()) | |
2707 | { | |
14b31740 | 2708 | Output_section* vnsec; |
3802b2dd ILT |
2709 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
2710 | elfcpp::SHT_GNU_verneed, | |
2711 | elfcpp::SHF_ALLOC, | |
2712 | false); | |
14b31740 ILT |
2713 | |
2714 | unsigned char* vnbuf; | |
2715 | unsigned int vnsize; | |
2716 | unsigned int vnentries; | |
7d1a9ebb ILT |
2717 | versions->need_section_contents<size, big_endian>(&this->dynpool_, |
2718 | &vnbuf, &vnsize, | |
2719 | &vnentries); | |
14b31740 | 2720 | |
7d9e3d98 ILT |
2721 | Output_section_data* vndata = |
2722 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); | |
14b31740 ILT |
2723 | |
2724 | vnsec->add_output_section_data(vndata); | |
2725 | vnsec->set_link_section(dynstr); | |
2726 | vnsec->set_info(vnentries); | |
2727 | ||
2728 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
2729 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
2730 | } | |
2731 | } | |
2732 | ||
dbe717ef ILT |
2733 | // Create the .interp section and PT_INTERP segment. |
2734 | ||
2735 | void | |
2736 | Layout::create_interp(const Target* target) | |
2737 | { | |
e55bde5e | 2738 | const char* interp = parameters->options().dynamic_linker(); |
dbe717ef ILT |
2739 | if (interp == NULL) |
2740 | { | |
2741 | interp = target->dynamic_linker(); | |
a3ad94ed | 2742 | gold_assert(interp != NULL); |
dbe717ef ILT |
2743 | } |
2744 | ||
2745 | size_t len = strlen(interp) + 1; | |
2746 | ||
2747 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
2748 | ||
3802b2dd ILT |
2749 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
2750 | elfcpp::SHT_PROGBITS, | |
2751 | elfcpp::SHF_ALLOC, | |
2752 | false); | |
dbe717ef ILT |
2753 | osec->add_output_section_data(odata); |
2754 | ||
1c4f3631 ILT |
2755 | if (!this->script_options_->saw_phdrs_clause()) |
2756 | { | |
2757 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_INTERP, | |
2758 | elfcpp::PF_R); | |
01676dcd | 2759 | oseg->add_output_section(osec, elfcpp::PF_R); |
1c4f3631 | 2760 | } |
dbe717ef ILT |
2761 | } |
2762 | ||
a3ad94ed ILT |
2763 | // Finish the .dynamic section and PT_DYNAMIC segment. |
2764 | ||
2765 | void | |
2766 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 2767 | const Symbol_table* symtab) |
a3ad94ed | 2768 | { |
1c4f3631 ILT |
2769 | if (!this->script_options_->saw_phdrs_clause()) |
2770 | { | |
2771 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, | |
2772 | (elfcpp::PF_R | |
2773 | | elfcpp::PF_W)); | |
01676dcd ILT |
2774 | oseg->add_output_section(this->dynamic_section_, |
2775 | elfcpp::PF_R | elfcpp::PF_W); | |
1c4f3631 | 2776 | } |
a3ad94ed | 2777 | |
16649710 ILT |
2778 | Output_data_dynamic* const odyn = this->dynamic_data_; |
2779 | ||
a3ad94ed ILT |
2780 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
2781 | p != input_objects->dynobj_end(); | |
2782 | ++p) | |
2783 | { | |
2784 | // FIXME: Handle --as-needed. | |
2785 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); | |
2786 | } | |
2787 | ||
8851ecca | 2788 | if (parameters->options().shared()) |
fced7afd | 2789 | { |
e55bde5e | 2790 | const char* soname = parameters->options().soname(); |
fced7afd ILT |
2791 | if (soname != NULL) |
2792 | odyn->add_string(elfcpp::DT_SONAME, soname); | |
2793 | } | |
2794 | ||
a3ad94ed ILT |
2795 | // FIXME: Support --init and --fini. |
2796 | Symbol* sym = symtab->lookup("_init"); | |
14b31740 | 2797 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
2798 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
2799 | ||
2800 | sym = symtab->lookup("_fini"); | |
14b31740 | 2801 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
2802 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
2803 | ||
2804 | // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY. | |
41f542e7 ILT |
2805 | |
2806 | // Add a DT_RPATH entry if needed. | |
e55bde5e | 2807 | const General_options::Dir_list& rpath(parameters->options().rpath()); |
41f542e7 ILT |
2808 | if (!rpath.empty()) |
2809 | { | |
2810 | std::string rpath_val; | |
2811 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
2812 | p != rpath.end(); | |
2813 | ++p) | |
2814 | { | |
2815 | if (rpath_val.empty()) | |
ad2d6943 | 2816 | rpath_val = p->name(); |
41f542e7 ILT |
2817 | else |
2818 | { | |
2819 | // Eliminate duplicates. | |
2820 | General_options::Dir_list::const_iterator q; | |
2821 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 2822 | if (q->name() == p->name()) |
41f542e7 ILT |
2823 | break; |
2824 | if (q == p) | |
2825 | { | |
2826 | rpath_val += ':'; | |
ad2d6943 | 2827 | rpath_val += p->name(); |
41f542e7 ILT |
2828 | } |
2829 | } | |
2830 | } | |
2831 | ||
2832 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
7c414435 DM |
2833 | if (parameters->options().enable_new_dtags()) |
2834 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); | |
41f542e7 | 2835 | } |
4f4c5f80 ILT |
2836 | |
2837 | // Look for text segments that have dynamic relocations. | |
2838 | bool have_textrel = false; | |
4e8fe71f | 2839 | if (!this->script_options_->saw_sections_clause()) |
4f4c5f80 | 2840 | { |
4e8fe71f ILT |
2841 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
2842 | p != this->segment_list_.end(); | |
2843 | ++p) | |
2844 | { | |
2845 | if (((*p)->flags() & elfcpp::PF_W) == 0 | |
2846 | && (*p)->dynamic_reloc_count() > 0) | |
2847 | { | |
2848 | have_textrel = true; | |
2849 | break; | |
2850 | } | |
2851 | } | |
2852 | } | |
2853 | else | |
2854 | { | |
2855 | // We don't know the section -> segment mapping, so we are | |
2856 | // conservative and just look for readonly sections with | |
2857 | // relocations. If those sections wind up in writable segments, | |
2858 | // then we have created an unnecessary DT_TEXTREL entry. | |
2859 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
2860 | p != this->section_list_.end(); | |
2861 | ++p) | |
2862 | { | |
2863 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 | |
2864 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 | |
2865 | && ((*p)->dynamic_reloc_count() > 0)) | |
2866 | { | |
2867 | have_textrel = true; | |
2868 | break; | |
2869 | } | |
2870 | } | |
4f4c5f80 ILT |
2871 | } |
2872 | ||
2873 | // Add a DT_FLAGS entry. We add it even if no flags are set so that | |
2874 | // post-link tools can easily modify these flags if desired. | |
2875 | unsigned int flags = 0; | |
2876 | if (have_textrel) | |
6a41d30b ILT |
2877 | { |
2878 | // Add a DT_TEXTREL for compatibility with older loaders. | |
2879 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
2880 | flags |= elfcpp::DF_TEXTREL; | |
2881 | } | |
8851ecca | 2882 | if (parameters->options().shared() && this->has_static_tls()) |
535890bb | 2883 | flags |= elfcpp::DF_STATIC_TLS; |
7be8330a CD |
2884 | if (parameters->options().origin()) |
2885 | flags |= elfcpp::DF_ORIGIN; | |
e1c74d60 ILT |
2886 | if (parameters->options().now()) |
2887 | flags |= elfcpp::DF_BIND_NOW; | |
4f4c5f80 | 2888 | odyn->add_constant(elfcpp::DT_FLAGS, flags); |
7c414435 DM |
2889 | |
2890 | flags = 0; | |
2891 | if (parameters->options().initfirst()) | |
2892 | flags |= elfcpp::DF_1_INITFIRST; | |
2893 | if (parameters->options().interpose()) | |
2894 | flags |= elfcpp::DF_1_INTERPOSE; | |
2895 | if (parameters->options().loadfltr()) | |
2896 | flags |= elfcpp::DF_1_LOADFLTR; | |
2897 | if (parameters->options().nodefaultlib()) | |
2898 | flags |= elfcpp::DF_1_NODEFLIB; | |
2899 | if (parameters->options().nodelete()) | |
2900 | flags |= elfcpp::DF_1_NODELETE; | |
2901 | if (parameters->options().nodlopen()) | |
2902 | flags |= elfcpp::DF_1_NOOPEN; | |
2903 | if (parameters->options().nodump()) | |
2904 | flags |= elfcpp::DF_1_NODUMP; | |
2905 | if (!parameters->options().shared()) | |
2906 | flags &= ~(elfcpp::DF_1_INITFIRST | |
2907 | | elfcpp::DF_1_NODELETE | |
2908 | | elfcpp::DF_1_NOOPEN); | |
7be8330a CD |
2909 | if (parameters->options().origin()) |
2910 | flags |= elfcpp::DF_1_ORIGIN; | |
e1c74d60 ILT |
2911 | if (parameters->options().now()) |
2912 | flags |= elfcpp::DF_1_NOW; | |
7c414435 DM |
2913 | if (flags) |
2914 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); | |
a3ad94ed ILT |
2915 | } |
2916 | ||
dff16297 ILT |
2917 | // The mapping of input section name prefixes to output section names. |
2918 | // In some cases one prefix is itself a prefix of another prefix; in | |
2919 | // such a case the longer prefix must come first. These prefixes are | |
2920 | // based on the GNU linker default ELF linker script. | |
a2fb1b05 | 2921 | |
ead1e424 | 2922 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
dff16297 | 2923 | const Layout::Section_name_mapping Layout::section_name_mapping[] = |
a2fb1b05 | 2924 | { |
dff16297 ILT |
2925 | MAPPING_INIT(".text.", ".text"), |
2926 | MAPPING_INIT(".ctors.", ".ctors"), | |
2927 | MAPPING_INIT(".dtors.", ".dtors"), | |
2928 | MAPPING_INIT(".rodata.", ".rodata"), | |
2929 | MAPPING_INIT(".data.rel.ro.local", ".data.rel.ro.local"), | |
2930 | MAPPING_INIT(".data.rel.ro", ".data.rel.ro"), | |
2931 | MAPPING_INIT(".data.", ".data"), | |
2932 | MAPPING_INIT(".bss.", ".bss"), | |
2933 | MAPPING_INIT(".tdata.", ".tdata"), | |
2934 | MAPPING_INIT(".tbss.", ".tbss"), | |
2935 | MAPPING_INIT(".init_array.", ".init_array"), | |
2936 | MAPPING_INIT(".fini_array.", ".fini_array"), | |
2937 | MAPPING_INIT(".sdata.", ".sdata"), | |
2938 | MAPPING_INIT(".sbss.", ".sbss"), | |
2939 | // FIXME: In the GNU linker, .sbss2 and .sdata2 are handled | |
2940 | // differently depending on whether it is creating a shared library. | |
2941 | MAPPING_INIT(".sdata2.", ".sdata"), | |
2942 | MAPPING_INIT(".sbss2.", ".sbss"), | |
2943 | MAPPING_INIT(".lrodata.", ".lrodata"), | |
2944 | MAPPING_INIT(".ldata.", ".ldata"), | |
2945 | MAPPING_INIT(".lbss.", ".lbss"), | |
2946 | MAPPING_INIT(".gcc_except_table.", ".gcc_except_table"), | |
2947 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.local.", ".data.rel.ro.local"), | |
2948 | MAPPING_INIT(".gnu.linkonce.d.rel.ro.", ".data.rel.ro"), | |
2949 | MAPPING_INIT(".gnu.linkonce.t.", ".text"), | |
2950 | MAPPING_INIT(".gnu.linkonce.r.", ".rodata"), | |
2951 | MAPPING_INIT(".gnu.linkonce.d.", ".data"), | |
2952 | MAPPING_INIT(".gnu.linkonce.b.", ".bss"), | |
2953 | MAPPING_INIT(".gnu.linkonce.s.", ".sdata"), | |
2954 | MAPPING_INIT(".gnu.linkonce.sb.", ".sbss"), | |
2955 | MAPPING_INIT(".gnu.linkonce.s2.", ".sdata"), | |
2956 | MAPPING_INIT(".gnu.linkonce.sb2.", ".sbss"), | |
2957 | MAPPING_INIT(".gnu.linkonce.wi.", ".debug_info"), | |
2958 | MAPPING_INIT(".gnu.linkonce.td.", ".tdata"), | |
2959 | MAPPING_INIT(".gnu.linkonce.tb.", ".tbss"), | |
2960 | MAPPING_INIT(".gnu.linkonce.lr.", ".lrodata"), | |
2961 | MAPPING_INIT(".gnu.linkonce.l.", ".ldata"), | |
2962 | MAPPING_INIT(".gnu.linkonce.lb.", ".lbss"), | |
1dcd334d DK |
2963 | MAPPING_INIT(".ARM.extab.", ".ARM.extab"), |
2964 | MAPPING_INIT(".gnu.linkonce.armextab.", ".ARM.extab"), | |
2965 | MAPPING_INIT(".ARM.exidx.", ".ARM.exidx"), | |
2966 | MAPPING_INIT(".gnu.linkonce.armexidx.", ".ARM.exidx"), | |
a2fb1b05 ILT |
2967 | }; |
2968 | #undef MAPPING_INIT | |
2969 | ||
dff16297 ILT |
2970 | const int Layout::section_name_mapping_count = |
2971 | (sizeof(Layout::section_name_mapping) | |
2972 | / sizeof(Layout::section_name_mapping[0])); | |
a2fb1b05 | 2973 | |
ead1e424 ILT |
2974 | // Choose the output section name to use given an input section name. |
2975 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
2976 | // length of NAME. | |
2977 | ||
2978 | const char* | |
2979 | Layout::output_section_name(const char* name, size_t* plen) | |
2980 | { | |
af4a8a83 ILT |
2981 | // gcc 4.3 generates the following sorts of section names when it |
2982 | // needs a section name specific to a function: | |
2983 | // .text.FN | |
2984 | // .rodata.FN | |
2985 | // .sdata2.FN | |
2986 | // .data.FN | |
2987 | // .data.rel.FN | |
2988 | // .data.rel.local.FN | |
2989 | // .data.rel.ro.FN | |
2990 | // .data.rel.ro.local.FN | |
2991 | // .sdata.FN | |
2992 | // .bss.FN | |
2993 | // .sbss.FN | |
2994 | // .tdata.FN | |
2995 | // .tbss.FN | |
2996 | ||
2997 | // The GNU linker maps all of those to the part before the .FN, | |
2998 | // except that .data.rel.local.FN is mapped to .data, and | |
2999 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
3000 | // beginning with .data.rel.ro.local are grouped together. | |
3001 | ||
3002 | // For an anonymous namespace, the string FN can contain a '.'. | |
3003 | ||
3004 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
3005 | // GNU linker maps to .rodata. | |
3006 | ||
dff16297 ILT |
3007 | // The .data.rel.ro sections are used with -z relro. The sections |
3008 | // are recognized by name. We use the same names that the GNU | |
3009 | // linker does for these sections. | |
af4a8a83 | 3010 | |
dff16297 ILT |
3011 | // It is hard to handle this in a principled way, so we don't even |
3012 | // try. We use a table of mappings. If the input section name is | |
3013 | // not found in the table, we simply use it as the output section | |
3014 | // name. | |
af4a8a83 | 3015 | |
dff16297 ILT |
3016 | const Section_name_mapping* psnm = section_name_mapping; |
3017 | for (int i = 0; i < section_name_mapping_count; ++i, ++psnm) | |
ead1e424 | 3018 | { |
dff16297 ILT |
3019 | if (strncmp(name, psnm->from, psnm->fromlen) == 0) |
3020 | { | |
3021 | *plen = psnm->tolen; | |
3022 | return psnm->to; | |
3023 | } | |
ead1e424 ILT |
3024 | } |
3025 | ||
ead1e424 ILT |
3026 | return name; |
3027 | } | |
3028 | ||
8a4c0b0d ILT |
3029 | // Check if a comdat group or .gnu.linkonce section with the given |
3030 | // NAME is selected for the link. If there is already a section, | |
3031 | // *KEPT_SECTION is set to point to the signature and the function | |
3032 | // returns false. Otherwise, the CANDIDATE signature is recorded for | |
3033 | // this NAME in the layout object, *KEPT_SECTION is set to the | |
3034 | // internal copy and the function return false. In some cases, with | |
3035 | // CANDIDATE->GROUP_ being false, KEPT_SECTION can point back to | |
3036 | // CANDIDATE. | |
a2fb1b05 ILT |
3037 | |
3038 | bool | |
e55bde5e | 3039 | Layout::find_or_add_kept_section(const std::string& name, |
8a4c0b0d ILT |
3040 | Kept_section* candidate, |
3041 | Kept_section** kept_section) | |
a2fb1b05 | 3042 | { |
e55bde5e ILT |
3043 | // It's normal to see a couple of entries here, for the x86 thunk |
3044 | // sections. If we see more than a few, we're linking a C++ | |
3045 | // program, and we resize to get more space to minimize rehashing. | |
3046 | if (this->signatures_.size() > 4 | |
3047 | && !this->resized_signatures_) | |
3048 | { | |
3049 | reserve_unordered_map(&this->signatures_, | |
3050 | this->number_of_input_files_ * 64); | |
3051 | this->resized_signatures_ = true; | |
3052 | } | |
3053 | ||
a2fb1b05 | 3054 | std::pair<Signatures::iterator, bool> ins( |
8a4c0b0d | 3055 | this->signatures_.insert(std::make_pair(name, *candidate))); |
a2fb1b05 | 3056 | |
8a4c0b0d ILT |
3057 | if (kept_section) |
3058 | *kept_section = &ins.first->second; | |
a2fb1b05 ILT |
3059 | if (ins.second) |
3060 | { | |
3061 | // This is the first time we've seen this signature. | |
3062 | return true; | |
3063 | } | |
3064 | ||
8a4c0b0d | 3065 | if (ins.first->second.is_group) |
a2fb1b05 ILT |
3066 | { |
3067 | // We've already seen a real section group with this signature. | |
2756a258 CC |
3068 | // If the kept group is from a plugin object, and we're in |
3069 | // the replacement phase, accept the new one as a replacement. | |
8a4c0b0d | 3070 | if (ins.first->second.object == NULL |
2756a258 CC |
3071 | && parameters->options().plugins()->in_replacement_phase()) |
3072 | { | |
8a4c0b0d | 3073 | ins.first->second = *candidate; |
2756a258 CC |
3074 | return true; |
3075 | } | |
a2fb1b05 ILT |
3076 | return false; |
3077 | } | |
8a4c0b0d | 3078 | else if (candidate->is_group) |
a2fb1b05 ILT |
3079 | { |
3080 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 3081 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 | 3082 | // a section group, and don't include this section group. |
8a4c0b0d | 3083 | ins.first->second.is_group = true; |
a2fb1b05 ILT |
3084 | return false; |
3085 | } | |
3086 | else | |
3087 | { | |
3088 | // We've already seen a linkonce section and this is a linkonce | |
3089 | // section. These don't block each other--this may be the same | |
3090 | // symbol name with different section types. | |
8a4c0b0d | 3091 | *kept_section = candidate; |
a2fb1b05 ILT |
3092 | return true; |
3093 | } | |
3094 | } | |
3095 | ||
e94cf127 CC |
3096 | // Find the given comdat signature, and return the object and section |
3097 | // index of the kept group. | |
3098 | Relobj* | |
3099 | Layout::find_kept_object(const std::string& signature, | |
3100 | unsigned int* pshndx) const | |
3101 | { | |
3102 | Signatures::const_iterator p = this->signatures_.find(signature); | |
3103 | if (p == this->signatures_.end()) | |
3104 | return NULL; | |
3105 | if (pshndx != NULL) | |
8a4c0b0d ILT |
3106 | *pshndx = p->second.shndx; |
3107 | return p->second.object; | |
e94cf127 CC |
3108 | } |
3109 | ||
a445fddf ILT |
3110 | // Store the allocated sections into the section list. |
3111 | ||
3112 | void | |
3113 | Layout::get_allocated_sections(Section_list* section_list) const | |
3114 | { | |
3115 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3116 | p != this->section_list_.end(); | |
3117 | ++p) | |
3118 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) | |
3119 | section_list->push_back(*p); | |
3120 | } | |
3121 | ||
3122 | // Create an output segment. | |
3123 | ||
3124 | Output_segment* | |
3125 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
3126 | { | |
8851ecca | 3127 | gold_assert(!parameters->options().relocatable()); |
a445fddf ILT |
3128 | Output_segment* oseg = new Output_segment(type, flags); |
3129 | this->segment_list_.push_back(oseg); | |
2d924fd9 ILT |
3130 | |
3131 | if (type == elfcpp::PT_TLS) | |
3132 | this->tls_segment_ = oseg; | |
3133 | else if (type == elfcpp::PT_GNU_RELRO) | |
3134 | this->relro_segment_ = oseg; | |
3135 | ||
a445fddf ILT |
3136 | return oseg; |
3137 | } | |
3138 | ||
730cdc88 ILT |
3139 | // Write out the Output_sections. Most won't have anything to write, |
3140 | // since most of the data will come from input sections which are | |
3141 | // handled elsewhere. But some Output_sections do have Output_data. | |
3142 | ||
3143 | void | |
3144 | Layout::write_output_sections(Output_file* of) const | |
3145 | { | |
3146 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3147 | p != this->section_list_.end(); | |
3148 | ++p) | |
3149 | { | |
3150 | if (!(*p)->after_input_sections()) | |
3151 | (*p)->write(of); | |
3152 | } | |
3153 | } | |
3154 | ||
61ba1cf9 ILT |
3155 | // Write out data not associated with a section or the symbol table. |
3156 | ||
3157 | void | |
9025d29d | 3158 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 3159 | { |
8851ecca | 3160 | if (!parameters->options().strip_all()) |
a3ad94ed | 3161 | { |
9e2dcb77 ILT |
3162 | const Output_section* symtab_section = this->symtab_section_; |
3163 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3164 | p != this->section_list_.end(); | |
3165 | ++p) | |
a3ad94ed | 3166 | { |
9e2dcb77 ILT |
3167 | if ((*p)->needs_symtab_index()) |
3168 | { | |
3169 | gold_assert(symtab_section != NULL); | |
3170 | unsigned int index = (*p)->symtab_index(); | |
3171 | gold_assert(index > 0 && index != -1U); | |
3172 | off_t off = (symtab_section->offset() | |
3173 | + index * symtab_section->entsize()); | |
d491d34e | 3174 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
9e2dcb77 | 3175 | } |
a3ad94ed ILT |
3176 | } |
3177 | } | |
3178 | ||
3179 | const Output_section* dynsym_section = this->dynsym_section_; | |
3180 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3181 | p != this->section_list_.end(); | |
3182 | ++p) | |
3183 | { | |
3184 | if ((*p)->needs_dynsym_index()) | |
3185 | { | |
3186 | gold_assert(dynsym_section != NULL); | |
3187 | unsigned int index = (*p)->dynsym_index(); | |
3188 | gold_assert(index > 0 && index != -1U); | |
3189 | off_t off = (dynsym_section->offset() | |
3190 | + index * dynsym_section->entsize()); | |
d491d34e | 3191 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
a3ad94ed ILT |
3192 | } |
3193 | } | |
3194 | ||
a3ad94ed | 3195 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
3196 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
3197 | p != this->special_output_list_.end(); | |
3198 | ++p) | |
3199 | (*p)->write(of); | |
3200 | } | |
3201 | ||
730cdc88 ILT |
3202 | // Write out the Output_sections which can only be written after the |
3203 | // input sections are complete. | |
3204 | ||
3205 | void | |
27bc2bce | 3206 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 3207 | { |
27bc2bce | 3208 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
3209 | // file size. Note we finalize the .shstrab last, to allow the |
3210 | // after_input_section sections to modify their section-names before | |
3211 | // writing. | |
17a1d0a9 | 3212 | if (this->any_postprocessing_sections_) |
27bc2bce | 3213 | { |
17a1d0a9 ILT |
3214 | off_t off = this->output_file_size_; |
3215 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); | |
8a4c0b0d | 3216 | |
17a1d0a9 ILT |
3217 | // Now that we've finalized the names, we can finalize the shstrab. |
3218 | off = | |
3219 | this->set_section_offsets(off, | |
3220 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
3221 | ||
3222 | if (off > this->output_file_size_) | |
3223 | { | |
3224 | of->resize(off); | |
3225 | this->output_file_size_ = off; | |
3226 | } | |
27bc2bce ILT |
3227 | } |
3228 | ||
730cdc88 ILT |
3229 | for (Section_list::const_iterator p = this->section_list_.begin(); |
3230 | p != this->section_list_.end(); | |
3231 | ++p) | |
3232 | { | |
3233 | if ((*p)->after_input_sections()) | |
3234 | (*p)->write(of); | |
3235 | } | |
27bc2bce | 3236 | |
27bc2bce | 3237 | this->section_headers_->write(of); |
730cdc88 ILT |
3238 | } |
3239 | ||
8ed814a9 ILT |
3240 | // If the build ID requires computing a checksum, do so here, and |
3241 | // write it out. We compute a checksum over the entire file because | |
3242 | // that is simplest. | |
3243 | ||
3244 | void | |
3245 | Layout::write_build_id(Output_file* of) const | |
3246 | { | |
3247 | if (this->build_id_note_ == NULL) | |
3248 | return; | |
3249 | ||
3250 | const unsigned char* iv = of->get_input_view(0, this->output_file_size_); | |
3251 | ||
3252 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), | |
3253 | this->build_id_note_->data_size()); | |
3254 | ||
3255 | const char* style = parameters->options().build_id(); | |
3256 | if (strcmp(style, "sha1") == 0) | |
3257 | { | |
3258 | sha1_ctx ctx; | |
3259 | sha1_init_ctx(&ctx); | |
3260 | sha1_process_bytes(iv, this->output_file_size_, &ctx); | |
3261 | sha1_finish_ctx(&ctx, ov); | |
3262 | } | |
3263 | else if (strcmp(style, "md5") == 0) | |
3264 | { | |
3265 | md5_ctx ctx; | |
3266 | md5_init_ctx(&ctx); | |
3267 | md5_process_bytes(iv, this->output_file_size_, &ctx); | |
3268 | md5_finish_ctx(&ctx, ov); | |
3269 | } | |
3270 | else | |
3271 | gold_unreachable(); | |
3272 | ||
3273 | of->write_output_view(this->build_id_note_->offset(), | |
3274 | this->build_id_note_->data_size(), | |
3275 | ov); | |
3276 | ||
3277 | of->free_input_view(0, this->output_file_size_, iv); | |
3278 | } | |
3279 | ||
516cb3d0 ILT |
3280 | // Write out a binary file. This is called after the link is |
3281 | // complete. IN is the temporary output file we used to generate the | |
3282 | // ELF code. We simply walk through the segments, read them from | |
3283 | // their file offset in IN, and write them to their load address in | |
3284 | // the output file. FIXME: with a bit more work, we could support | |
3285 | // S-records and/or Intel hex format here. | |
3286 | ||
3287 | void | |
3288 | Layout::write_binary(Output_file* in) const | |
3289 | { | |
e55bde5e | 3290 | gold_assert(parameters->options().oformat_enum() |
bc644c6c | 3291 | == General_options::OBJECT_FORMAT_BINARY); |
516cb3d0 ILT |
3292 | |
3293 | // Get the size of the binary file. | |
3294 | uint64_t max_load_address = 0; | |
3295 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3296 | p != this->segment_list_.end(); | |
3297 | ++p) | |
3298 | { | |
3299 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
3300 | { | |
3301 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); | |
3302 | if (max_paddr > max_load_address) | |
3303 | max_load_address = max_paddr; | |
3304 | } | |
3305 | } | |
3306 | ||
8851ecca | 3307 | Output_file out(parameters->options().output_file_name()); |
516cb3d0 ILT |
3308 | out.open(max_load_address); |
3309 | ||
3310 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3311 | p != this->segment_list_.end(); | |
3312 | ++p) | |
3313 | { | |
3314 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
3315 | { | |
3316 | const unsigned char* vin = in->get_input_view((*p)->offset(), | |
3317 | (*p)->filesz()); | |
3318 | unsigned char* vout = out.get_output_view((*p)->paddr(), | |
3319 | (*p)->filesz()); | |
3320 | memcpy(vout, vin, (*p)->filesz()); | |
3321 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); | |
3322 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); | |
3323 | } | |
3324 | } | |
3325 | ||
3326 | out.close(); | |
3327 | } | |
3328 | ||
7d9e3d98 ILT |
3329 | // Print the output sections to the map file. |
3330 | ||
3331 | void | |
3332 | Layout::print_to_mapfile(Mapfile* mapfile) const | |
3333 | { | |
3334 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3335 | p != this->segment_list_.end(); | |
3336 | ++p) | |
3337 | (*p)->print_sections_to_mapfile(mapfile); | |
3338 | } | |
3339 | ||
ad8f37d1 ILT |
3340 | // Print statistical information to stderr. This is used for --stats. |
3341 | ||
3342 | void | |
3343 | Layout::print_stats() const | |
3344 | { | |
3345 | this->namepool_.print_stats("section name pool"); | |
3346 | this->sympool_.print_stats("output symbol name pool"); | |
3347 | this->dynpool_.print_stats("dynamic name pool"); | |
38c5e8b4 ILT |
3348 | |
3349 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3350 | p != this->section_list_.end(); | |
3351 | ++p) | |
3352 | (*p)->print_merge_stats(); | |
ad8f37d1 ILT |
3353 | } |
3354 | ||
730cdc88 ILT |
3355 | // Write_sections_task methods. |
3356 | ||
3357 | // We can always run this task. | |
3358 | ||
17a1d0a9 ILT |
3359 | Task_token* |
3360 | Write_sections_task::is_runnable() | |
730cdc88 | 3361 | { |
17a1d0a9 | 3362 | return NULL; |
730cdc88 ILT |
3363 | } |
3364 | ||
3365 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
3366 | // when finished. | |
3367 | ||
17a1d0a9 ILT |
3368 | void |
3369 | Write_sections_task::locks(Task_locker* tl) | |
730cdc88 | 3370 | { |
17a1d0a9 ILT |
3371 | tl->add(this, this->output_sections_blocker_); |
3372 | tl->add(this, this->final_blocker_); | |
730cdc88 ILT |
3373 | } |
3374 | ||
3375 | // Run the task--write out the data. | |
3376 | ||
3377 | void | |
3378 | Write_sections_task::run(Workqueue*) | |
3379 | { | |
3380 | this->layout_->write_output_sections(this->of_); | |
3381 | } | |
3382 | ||
61ba1cf9 ILT |
3383 | // Write_data_task methods. |
3384 | ||
3385 | // We can always run this task. | |
3386 | ||
17a1d0a9 ILT |
3387 | Task_token* |
3388 | Write_data_task::is_runnable() | |
61ba1cf9 | 3389 | { |
17a1d0a9 | 3390 | return NULL; |
61ba1cf9 ILT |
3391 | } |
3392 | ||
3393 | // We need to unlock FINAL_BLOCKER when finished. | |
3394 | ||
17a1d0a9 ILT |
3395 | void |
3396 | Write_data_task::locks(Task_locker* tl) | |
61ba1cf9 | 3397 | { |
17a1d0a9 | 3398 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
3399 | } |
3400 | ||
3401 | // Run the task--write out the data. | |
3402 | ||
3403 | void | |
3404 | Write_data_task::run(Workqueue*) | |
3405 | { | |
9025d29d | 3406 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
3407 | } |
3408 | ||
3409 | // Write_symbols_task methods. | |
3410 | ||
3411 | // We can always run this task. | |
3412 | ||
17a1d0a9 ILT |
3413 | Task_token* |
3414 | Write_symbols_task::is_runnable() | |
61ba1cf9 | 3415 | { |
17a1d0a9 | 3416 | return NULL; |
61ba1cf9 ILT |
3417 | } |
3418 | ||
3419 | // We need to unlock FINAL_BLOCKER when finished. | |
3420 | ||
17a1d0a9 ILT |
3421 | void |
3422 | Write_symbols_task::locks(Task_locker* tl) | |
61ba1cf9 | 3423 | { |
17a1d0a9 | 3424 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
3425 | } |
3426 | ||
3427 | // Run the task--write out the symbols. | |
3428 | ||
3429 | void | |
3430 | Write_symbols_task::run(Workqueue*) | |
3431 | { | |
fd9d194f ILT |
3432 | this->symtab_->write_globals(this->sympool_, this->dynpool_, |
3433 | this->layout_->symtab_xindex(), | |
d491d34e | 3434 | this->layout_->dynsym_xindex(), this->of_); |
61ba1cf9 ILT |
3435 | } |
3436 | ||
730cdc88 ILT |
3437 | // Write_after_input_sections_task methods. |
3438 | ||
3439 | // We can only run this task after the input sections have completed. | |
3440 | ||
17a1d0a9 ILT |
3441 | Task_token* |
3442 | Write_after_input_sections_task::is_runnable() | |
730cdc88 ILT |
3443 | { |
3444 | if (this->input_sections_blocker_->is_blocked()) | |
17a1d0a9 ILT |
3445 | return this->input_sections_blocker_; |
3446 | return NULL; | |
730cdc88 ILT |
3447 | } |
3448 | ||
3449 | // We need to unlock FINAL_BLOCKER when finished. | |
3450 | ||
17a1d0a9 ILT |
3451 | void |
3452 | Write_after_input_sections_task::locks(Task_locker* tl) | |
730cdc88 | 3453 | { |
17a1d0a9 | 3454 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
3455 | } |
3456 | ||
3457 | // Run the task. | |
3458 | ||
3459 | void | |
3460 | Write_after_input_sections_task::run(Workqueue*) | |
3461 | { | |
3462 | this->layout_->write_sections_after_input_sections(this->of_); | |
3463 | } | |
3464 | ||
92e059d8 | 3465 | // Close_task_runner methods. |
61ba1cf9 ILT |
3466 | |
3467 | // Run the task--close the file. | |
3468 | ||
3469 | void | |
17a1d0a9 | 3470 | Close_task_runner::run(Workqueue*, const Task*) |
61ba1cf9 | 3471 | { |
8ed814a9 ILT |
3472 | // If we need to compute a checksum for the BUILD if, we do so here. |
3473 | this->layout_->write_build_id(this->of_); | |
3474 | ||
516cb3d0 | 3475 | // If we've been asked to create a binary file, we do so here. |
7cc619c3 | 3476 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
3477 | this->layout_->write_binary(this->of_); |
3478 | ||
61ba1cf9 ILT |
3479 | this->of_->close(); |
3480 | } | |
3481 | ||
a2fb1b05 ILT |
3482 | // Instantiate the templates we need. We could use the configure |
3483 | // script to restrict this to only the ones for implemented targets. | |
3484 | ||
193a53d9 | 3485 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 ILT |
3486 | template |
3487 | Output_section* | |
730cdc88 ILT |
3488 | Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx, |
3489 | const char* name, | |
3490 | const elfcpp::Shdr<32, false>& shdr, | |
3491 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3492 | #endif |
a2fb1b05 | 3493 | |
193a53d9 | 3494 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
3495 | template |
3496 | Output_section* | |
730cdc88 ILT |
3497 | Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx, |
3498 | const char* name, | |
3499 | const elfcpp::Shdr<32, true>& shdr, | |
3500 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3501 | #endif |
a2fb1b05 | 3502 | |
193a53d9 | 3503 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
3504 | template |
3505 | Output_section* | |
730cdc88 ILT |
3506 | Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx, |
3507 | const char* name, | |
3508 | const elfcpp::Shdr<64, false>& shdr, | |
3509 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3510 | #endif |
a2fb1b05 | 3511 | |
193a53d9 | 3512 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
3513 | template |
3514 | Output_section* | |
730cdc88 ILT |
3515 | Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx, |
3516 | const char* name, | |
3517 | const elfcpp::Shdr<64, true>& shdr, | |
3518 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3519 | #endif |
a2fb1b05 | 3520 | |
6a74a719 ILT |
3521 | #ifdef HAVE_TARGET_32_LITTLE |
3522 | template | |
3523 | Output_section* | |
3524 | Layout::layout_reloc<32, false>(Sized_relobj<32, false>* object, | |
3525 | unsigned int reloc_shndx, | |
3526 | const elfcpp::Shdr<32, false>& shdr, | |
3527 | Output_section* data_section, | |
3528 | Relocatable_relocs* rr); | |
3529 | #endif | |
3530 | ||
3531 | #ifdef HAVE_TARGET_32_BIG | |
3532 | template | |
3533 | Output_section* | |
3534 | Layout::layout_reloc<32, true>(Sized_relobj<32, true>* object, | |
3535 | unsigned int reloc_shndx, | |
3536 | const elfcpp::Shdr<32, true>& shdr, | |
3537 | Output_section* data_section, | |
3538 | Relocatable_relocs* rr); | |
3539 | #endif | |
3540 | ||
3541 | #ifdef HAVE_TARGET_64_LITTLE | |
3542 | template | |
3543 | Output_section* | |
3544 | Layout::layout_reloc<64, false>(Sized_relobj<64, false>* object, | |
3545 | unsigned int reloc_shndx, | |
3546 | const elfcpp::Shdr<64, false>& shdr, | |
3547 | Output_section* data_section, | |
3548 | Relocatable_relocs* rr); | |
3549 | #endif | |
3550 | ||
3551 | #ifdef HAVE_TARGET_64_BIG | |
3552 | template | |
3553 | Output_section* | |
3554 | Layout::layout_reloc<64, true>(Sized_relobj<64, true>* object, | |
3555 | unsigned int reloc_shndx, | |
3556 | const elfcpp::Shdr<64, true>& shdr, | |
3557 | Output_section* data_section, | |
3558 | Relocatable_relocs* rr); | |
3559 | #endif | |
3560 | ||
3561 | #ifdef HAVE_TARGET_32_LITTLE | |
3562 | template | |
3563 | void | |
3564 | Layout::layout_group<32, false>(Symbol_table* symtab, | |
3565 | Sized_relobj<32, false>* object, | |
3566 | unsigned int, | |
3567 | const char* group_section_name, | |
3568 | const char* signature, | |
3569 | const elfcpp::Shdr<32, false>& shdr, | |
8825ac63 ILT |
3570 | elfcpp::Elf_Word flags, |
3571 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3572 | #endif |
3573 | ||
3574 | #ifdef HAVE_TARGET_32_BIG | |
3575 | template | |
3576 | void | |
3577 | Layout::layout_group<32, true>(Symbol_table* symtab, | |
3578 | Sized_relobj<32, true>* object, | |
3579 | unsigned int, | |
3580 | const char* group_section_name, | |
3581 | const char* signature, | |
3582 | const elfcpp::Shdr<32, true>& shdr, | |
8825ac63 ILT |
3583 | elfcpp::Elf_Word flags, |
3584 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3585 | #endif |
3586 | ||
3587 | #ifdef HAVE_TARGET_64_LITTLE | |
3588 | template | |
3589 | void | |
3590 | Layout::layout_group<64, false>(Symbol_table* symtab, | |
3591 | Sized_relobj<64, false>* object, | |
3592 | unsigned int, | |
3593 | const char* group_section_name, | |
3594 | const char* signature, | |
3595 | const elfcpp::Shdr<64, false>& shdr, | |
8825ac63 ILT |
3596 | elfcpp::Elf_Word flags, |
3597 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3598 | #endif |
3599 | ||
3600 | #ifdef HAVE_TARGET_64_BIG | |
3601 | template | |
3602 | void | |
3603 | Layout::layout_group<64, true>(Symbol_table* symtab, | |
3604 | Sized_relobj<64, true>* object, | |
3605 | unsigned int, | |
3606 | const char* group_section_name, | |
3607 | const char* signature, | |
3608 | const elfcpp::Shdr<64, true>& shdr, | |
8825ac63 ILT |
3609 | elfcpp::Elf_Word flags, |
3610 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3611 | #endif |
3612 | ||
730cdc88 ILT |
3613 | #ifdef HAVE_TARGET_32_LITTLE |
3614 | template | |
3615 | Output_section* | |
3616 | Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object, | |
3617 | const unsigned char* symbols, | |
3618 | off_t symbols_size, | |
3619 | const unsigned char* symbol_names, | |
3620 | off_t symbol_names_size, | |
3621 | unsigned int shndx, | |
3622 | const elfcpp::Shdr<32, false>& shdr, | |
3623 | unsigned int reloc_shndx, | |
3624 | unsigned int reloc_type, | |
3625 | off_t* off); | |
3626 | #endif | |
3627 | ||
3628 | #ifdef HAVE_TARGET_32_BIG | |
3629 | template | |
3630 | Output_section* | |
3631 | Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object, | |
3632 | const unsigned char* symbols, | |
3633 | off_t symbols_size, | |
3634 | const unsigned char* symbol_names, | |
3635 | off_t symbol_names_size, | |
3636 | unsigned int shndx, | |
3637 | const elfcpp::Shdr<32, true>& shdr, | |
3638 | unsigned int reloc_shndx, | |
3639 | unsigned int reloc_type, | |
3640 | off_t* off); | |
3641 | #endif | |
3642 | ||
3643 | #ifdef HAVE_TARGET_64_LITTLE | |
3644 | template | |
3645 | Output_section* | |
3646 | Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object, | |
3647 | const unsigned char* symbols, | |
3648 | off_t symbols_size, | |
3649 | const unsigned char* symbol_names, | |
3650 | off_t symbol_names_size, | |
3651 | unsigned int shndx, | |
3652 | const elfcpp::Shdr<64, false>& shdr, | |
3653 | unsigned int reloc_shndx, | |
3654 | unsigned int reloc_type, | |
3655 | off_t* off); | |
3656 | #endif | |
3657 | ||
3658 | #ifdef HAVE_TARGET_64_BIG | |
3659 | template | |
3660 | Output_section* | |
3661 | Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object, | |
3662 | const unsigned char* symbols, | |
3663 | off_t symbols_size, | |
3664 | const unsigned char* symbol_names, | |
3665 | off_t symbol_names_size, | |
3666 | unsigned int shndx, | |
3667 | const elfcpp::Shdr<64, true>& shdr, | |
3668 | unsigned int reloc_shndx, | |
3669 | unsigned int reloc_type, | |
3670 | off_t* off); | |
3671 | #endif | |
a2fb1b05 ILT |
3672 | |
3673 | } // End namespace gold. |