Commit | Line | Data |
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a2fb1b05 ILT |
1 | // layout.cc -- lay out output file sections for gold |
2 | ||
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
a2fb1b05 ILT |
23 | #include "gold.h" |
24 | ||
8ed814a9 | 25 | #include <cerrno> |
a2fb1b05 | 26 | #include <cstring> |
54dc6425 | 27 | #include <algorithm> |
a2fb1b05 ILT |
28 | #include <iostream> |
29 | #include <utility> | |
8ed814a9 ILT |
30 | #include <fcntl.h> |
31 | #include <unistd.h> | |
32 | #include "libiberty.h" | |
33 | #include "md5.h" | |
34 | #include "sha1.h" | |
a2fb1b05 | 35 | |
7e1edb90 | 36 | #include "parameters.h" |
14144f39 | 37 | #include "options.h" |
7d9e3d98 | 38 | #include "mapfile.h" |
a445fddf ILT |
39 | #include "script.h" |
40 | #include "script-sections.h" | |
a2fb1b05 | 41 | #include "output.h" |
f6ce93d6 | 42 | #include "symtab.h" |
a3ad94ed | 43 | #include "dynobj.h" |
3151305a | 44 | #include "ehframe.h" |
96803768 | 45 | #include "compressed_output.h" |
62b01cb5 | 46 | #include "reduced_debug_output.h" |
6a74a719 | 47 | #include "reloc.h" |
2a00e4fb | 48 | #include "descriptors.h" |
2756a258 | 49 | #include "plugin.h" |
3ce2c28e ILT |
50 | #include "incremental.h" |
51 | #include "layout.h" | |
a2fb1b05 ILT |
52 | |
53 | namespace gold | |
54 | { | |
55 | ||
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 ILT |
126 | resized_signatures_(false), |
127 | incremental_inputs_(NULL) | |
54dc6425 ILT |
128 | { |
129 | // Make space for more than enough segments for a typical file. | |
130 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
131 | this->segment_list_.reserve(12); |
132 | ||
27bc2bce ILT |
133 | // We expect two unattached Output_data objects: the file header and |
134 | // the segment headers. | |
135 | this->special_output_list_.reserve(2); | |
3ce2c28e ILT |
136 | |
137 | // Initialize structure needed for an incremental build. | |
138 | if (parameters->options().incremental()) | |
139 | this->incremental_inputs_ = new Incremental_inputs; | |
54dc6425 ILT |
140 | } |
141 | ||
a2fb1b05 ILT |
142 | // Hash a key we use to look up an output section mapping. |
143 | ||
144 | size_t | |
145 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
146 | { | |
f0641a0b | 147 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
148 | } |
149 | ||
02d2ba74 ILT |
150 | // Returns whether the given section is in the list of |
151 | // debug-sections-used-by-some-version-of-gdb. Currently, | |
152 | // we've checked versions of gdb up to and including 6.7.1. | |
153 | ||
154 | static const char* gdb_sections[] = | |
155 | { ".debug_abbrev", | |
156 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
157 | ".debug_frame", | |
158 | ".debug_info", | |
159 | ".debug_line", | |
160 | ".debug_loc", | |
161 | ".debug_macinfo", | |
162 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
163 | ".debug_ranges", | |
164 | ".debug_str", | |
165 | }; | |
166 | ||
62b01cb5 ILT |
167 | static const char* lines_only_debug_sections[] = |
168 | { ".debug_abbrev", | |
169 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
170 | // ".debug_frame", | |
171 | ".debug_info", | |
172 | ".debug_line", | |
173 | // ".debug_loc", | |
174 | // ".debug_macinfo", | |
175 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
176 | // ".debug_ranges", | |
177 | ".debug_str", | |
178 | }; | |
179 | ||
02d2ba74 ILT |
180 | static inline bool |
181 | is_gdb_debug_section(const char* str) | |
182 | { | |
183 | // We can do this faster: binary search or a hashtable. But why bother? | |
184 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) | |
185 | if (strcmp(str, gdb_sections[i]) == 0) | |
186 | return true; | |
187 | return false; | |
188 | } | |
189 | ||
62b01cb5 ILT |
190 | static inline bool |
191 | is_lines_only_debug_section(const char* str) | |
192 | { | |
193 | // We can do this faster: binary search or a hashtable. But why bother? | |
194 | for (size_t i = 0; | |
195 | i < sizeof(lines_only_debug_sections)/sizeof(*lines_only_debug_sections); | |
196 | ++i) | |
197 | if (strcmp(str, lines_only_debug_sections[i]) == 0) | |
198 | return true; | |
199 | return false; | |
200 | } | |
201 | ||
a2fb1b05 ILT |
202 | // Whether to include this section in the link. |
203 | ||
204 | template<int size, bool big_endian> | |
205 | bool | |
730cdc88 | 206 | Layout::include_section(Sized_relobj<size, big_endian>*, const char* name, |
a2fb1b05 ILT |
207 | const elfcpp::Shdr<size, big_endian>& shdr) |
208 | { | |
fd06b4aa CC |
209 | if (shdr.get_sh_flags() & elfcpp::SHF_EXCLUDE) |
210 | return false; | |
211 | ||
a2fb1b05 ILT |
212 | switch (shdr.get_sh_type()) |
213 | { | |
214 | case elfcpp::SHT_NULL: | |
215 | case elfcpp::SHT_SYMTAB: | |
216 | case elfcpp::SHT_DYNSYM: | |
a2fb1b05 ILT |
217 | case elfcpp::SHT_HASH: |
218 | case elfcpp::SHT_DYNAMIC: | |
219 | case elfcpp::SHT_SYMTAB_SHNDX: | |
220 | return false; | |
221 | ||
5cb66f97 ILT |
222 | case elfcpp::SHT_STRTAB: |
223 | // Discard the sections which have special meanings in the ELF | |
224 | // ABI. Keep others (e.g., .stabstr). We could also do this by | |
225 | // checking the sh_link fields of the appropriate sections. | |
226 | return (strcmp(name, ".dynstr") != 0 | |
227 | && strcmp(name, ".strtab") != 0 | |
228 | && strcmp(name, ".shstrtab") != 0); | |
229 | ||
a2fb1b05 ILT |
230 | case elfcpp::SHT_RELA: |
231 | case elfcpp::SHT_REL: | |
232 | case elfcpp::SHT_GROUP: | |
7019cd25 ILT |
233 | // If we are emitting relocations these should be handled |
234 | // elsewhere. | |
8851ecca ILT |
235 | gold_assert(!parameters->options().relocatable() |
236 | && !parameters->options().emit_relocs()); | |
6a74a719 | 237 | return false; |
a2fb1b05 | 238 | |
9e2dcb77 | 239 | case elfcpp::SHT_PROGBITS: |
8851ecca | 240 | if (parameters->options().strip_debug() |
9e2dcb77 ILT |
241 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
242 | { | |
e94cf127 | 243 | if (is_debug_info_section(name)) |
9e2dcb77 ILT |
244 | return false; |
245 | } | |
62b01cb5 ILT |
246 | if (parameters->options().strip_debug_non_line() |
247 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
248 | { | |
249 | // Debugging sections can only be recognized by name. | |
250 | if (is_prefix_of(".debug", name) | |
251 | && !is_lines_only_debug_section(name)) | |
252 | return false; | |
253 | } | |
8851ecca | 254 | if (parameters->options().strip_debug_gdb() |
02d2ba74 ILT |
255 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) |
256 | { | |
257 | // Debugging sections can only be recognized by name. | |
258 | if (is_prefix_of(".debug", name) | |
259 | && !is_gdb_debug_section(name)) | |
260 | return false; | |
261 | } | |
fd06b4aa CC |
262 | if (parameters->options().strip_lto_sections() |
263 | && !parameters->options().relocatable() | |
264 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
265 | { | |
266 | // Ignore LTO sections containing intermediate code. | |
267 | if (is_prefix_of(".gnu.lto_", name)) | |
268 | return false; | |
269 | } | |
9e2dcb77 ILT |
270 | return true; |
271 | ||
a2fb1b05 | 272 | default: |
a2fb1b05 ILT |
273 | return true; |
274 | } | |
275 | } | |
276 | ||
ead1e424 | 277 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 278 | |
a2fb1b05 | 279 | Output_section* |
ead1e424 | 280 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 281 | { |
a445fddf ILT |
282 | for (Section_list::const_iterator p = this->section_list_.begin(); |
283 | p != this->section_list_.end(); | |
ead1e424 | 284 | ++p) |
a445fddf ILT |
285 | if (strcmp((*p)->name(), name) == 0) |
286 | return *p; | |
ead1e424 ILT |
287 | return NULL; |
288 | } | |
a2fb1b05 | 289 | |
ead1e424 ILT |
290 | // Return an output segment of type TYPE, with segment flags SET set |
291 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 292 | |
ead1e424 ILT |
293 | Output_segment* |
294 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
295 | elfcpp::Elf_Word clear) const | |
296 | { | |
297 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
298 | p != this->segment_list_.end(); | |
299 | ++p) | |
300 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
301 | && ((*p)->flags() & set) == set | |
302 | && ((*p)->flags() & clear) == 0) | |
303 | return *p; | |
304 | return NULL; | |
305 | } | |
a2fb1b05 | 306 | |
ead1e424 | 307 | // Return the output section to use for section NAME with type TYPE |
a445fddf ILT |
308 | // and section flags FLAGS. NAME must be canonicalized in the string |
309 | // pool, and NAME_KEY is the key. | |
a2fb1b05 | 310 | |
ead1e424 | 311 | Output_section* |
f0641a0b ILT |
312 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
313 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags) | |
ead1e424 | 314 | { |
154e0e9a ILT |
315 | elfcpp::Elf_Xword lookup_flags = flags; |
316 | ||
317 | // Ignoring SHF_WRITE and SHF_EXECINSTR here means that we combine | |
318 | // read-write with read-only sections. Some other ELF linkers do | |
319 | // not do this. FIXME: Perhaps there should be an option | |
320 | // controlling this. | |
321 | lookup_flags &= ~(elfcpp::SHF_WRITE | elfcpp::SHF_EXECINSTR); | |
322 | ||
323 | const Key key(name_key, std::make_pair(type, lookup_flags)); | |
a2fb1b05 ILT |
324 | const std::pair<Key, Output_section*> v(key, NULL); |
325 | std::pair<Section_name_map::iterator, bool> ins( | |
326 | this->section_name_map_.insert(v)); | |
327 | ||
a2fb1b05 | 328 | if (!ins.second) |
ead1e424 | 329 | return ins.first->second; |
a2fb1b05 ILT |
330 | else |
331 | { | |
332 | // This is the first time we've seen this name/type/flags | |
4e2b1697 ILT |
333 | // combination. For compatibility with the GNU linker, we |
334 | // combine sections with contents and zero flags with sections | |
335 | // with non-zero flags. This is a workaround for cases where | |
336 | // assembler code forgets to set section flags. FIXME: Perhaps | |
337 | // there should be an option to control this. | |
15cf077e | 338 | Output_section* os = NULL; |
4e2b1697 ILT |
339 | |
340 | if (type == elfcpp::SHT_PROGBITS) | |
15cf077e | 341 | { |
4e2b1697 ILT |
342 | if (flags == 0) |
343 | { | |
344 | Output_section* same_name = this->find_output_section(name); | |
345 | if (same_name != NULL | |
346 | && same_name->type() == elfcpp::SHT_PROGBITS | |
347 | && (same_name->flags() & elfcpp::SHF_TLS) == 0) | |
348 | os = same_name; | |
349 | } | |
350 | else if ((flags & elfcpp::SHF_TLS) == 0) | |
351 | { | |
352 | elfcpp::Elf_Xword zero_flags = 0; | |
353 | const Key zero_key(name_key, std::make_pair(type, zero_flags)); | |
354 | Section_name_map::iterator p = | |
355 | this->section_name_map_.find(zero_key); | |
356 | if (p != this->section_name_map_.end()) | |
154e0e9a | 357 | os = p->second; |
4e2b1697 | 358 | } |
15cf077e | 359 | } |
4e2b1697 | 360 | |
15cf077e ILT |
361 | if (os == NULL) |
362 | os = this->make_output_section(name, type, flags); | |
a2fb1b05 | 363 | ins.first->second = os; |
ead1e424 | 364 | return os; |
a2fb1b05 | 365 | } |
ead1e424 ILT |
366 | } |
367 | ||
a445fddf ILT |
368 | // Pick the output section to use for section NAME, in input file |
369 | // RELOBJ, with type TYPE and flags FLAGS. RELOBJ may be NULL for a | |
154e0e9a ILT |
370 | // linker created section. IS_INPUT_SECTION is true if we are |
371 | // choosing an output section for an input section found in a input | |
372 | // file. This will return NULL if the input section should be | |
373 | // discarded. | |
a445fddf ILT |
374 | |
375 | Output_section* | |
376 | Layout::choose_output_section(const Relobj* relobj, const char* name, | |
377 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags, | |
154e0e9a | 378 | bool is_input_section) |
a445fddf | 379 | { |
154e0e9a ILT |
380 | // We should not see any input sections after we have attached |
381 | // sections to segments. | |
382 | gold_assert(!is_input_section || !this->sections_are_attached_); | |
383 | ||
384 | // Some flags in the input section should not be automatically | |
385 | // copied to the output section. | |
a445fddf ILT |
386 | flags &= ~ (elfcpp::SHF_INFO_LINK |
387 | | elfcpp::SHF_LINK_ORDER | |
388 | | elfcpp::SHF_GROUP | |
389 | | elfcpp::SHF_MERGE | |
390 | | elfcpp::SHF_STRINGS); | |
391 | ||
392 | if (this->script_options_->saw_sections_clause()) | |
393 | { | |
394 | // We are using a SECTIONS clause, so the output section is | |
395 | // chosen based only on the name. | |
396 | ||
397 | Script_sections* ss = this->script_options_->script_sections(); | |
398 | const char* file_name = relobj == NULL ? NULL : relobj->name().c_str(); | |
399 | Output_section** output_section_slot; | |
400 | name = ss->output_section_name(file_name, name, &output_section_slot); | |
401 | if (name == NULL) | |
402 | { | |
403 | // The SECTIONS clause says to discard this input section. | |
404 | return NULL; | |
405 | } | |
406 | ||
407 | // If this is an orphan section--one not mentioned in the linker | |
408 | // script--then OUTPUT_SECTION_SLOT will be NULL, and we do the | |
409 | // default processing below. | |
410 | ||
411 | if (output_section_slot != NULL) | |
412 | { | |
413 | if (*output_section_slot != NULL) | |
154e0e9a | 414 | return *output_section_slot; |
a445fddf ILT |
415 | |
416 | // We don't put sections found in the linker script into | |
417 | // SECTION_NAME_MAP_. That keeps us from getting confused | |
418 | // if an orphan section is mapped to a section with the same | |
419 | // name as one in the linker script. | |
420 | ||
421 | name = this->namepool_.add(name, false, NULL); | |
422 | ||
423 | Output_section* os = this->make_output_section(name, type, flags); | |
424 | os->set_found_in_sections_clause(); | |
425 | *output_section_slot = os; | |
426 | return os; | |
427 | } | |
428 | } | |
429 | ||
430 | // FIXME: Handle SHF_OS_NONCONFORMING somewhere. | |
431 | ||
432 | // Turn NAME from the name of the input section into the name of the | |
433 | // output section. | |
434 | ||
435 | size_t len = strlen(name); | |
401a9a73 CC |
436 | if (is_input_section |
437 | && !this->script_options_->saw_sections_clause() | |
438 | && !parameters->options().relocatable()) | |
a445fddf ILT |
439 | name = Layout::output_section_name(name, &len); |
440 | ||
441 | Stringpool::Key name_key; | |
442 | name = this->namepool_.add_with_length(name, len, true, &name_key); | |
443 | ||
444 | // Find or make the output section. The output section is selected | |
445 | // based on the section name, type, and flags. | |
446 | return this->get_output_section(name, name_key, type, flags); | |
447 | } | |
448 | ||
ead1e424 | 449 | // Return the output section to use for input section SHNDX, with name |
730cdc88 ILT |
450 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
451 | // index of a relocation section which applies to this section, or 0 | |
452 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
453 | // relocation section if there is one. Set *OFF to the offset of this | |
454 | // input section without the output section. Return NULL if the | |
455 | // section should be discarded. Set *OFF to -1 if the section | |
456 | // contents should not be written directly to the output file, but | |
457 | // will instead receive special handling. | |
ead1e424 ILT |
458 | |
459 | template<int size, bool big_endian> | |
460 | Output_section* | |
730cdc88 ILT |
461 | Layout::layout(Sized_relobj<size, big_endian>* object, unsigned int shndx, |
462 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, | |
463 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 | 464 | { |
ef9beddf ILT |
465 | *off = 0; |
466 | ||
ead1e424 ILT |
467 | if (!this->include_section(object, name, shdr)) |
468 | return NULL; | |
469 | ||
6a74a719 ILT |
470 | Output_section* os; |
471 | ||
472 | // In a relocatable link a grouped section must not be combined with | |
473 | // any other sections. | |
8851ecca | 474 | if (parameters->options().relocatable() |
6a74a719 ILT |
475 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
476 | { | |
477 | name = this->namepool_.add(name, true, NULL); | |
478 | os = this->make_output_section(name, shdr.get_sh_type(), | |
479 | shdr.get_sh_flags()); | |
480 | } | |
481 | else | |
482 | { | |
483 | os = this->choose_output_section(object, name, shdr.get_sh_type(), | |
484 | shdr.get_sh_flags(), true); | |
485 | if (os == NULL) | |
486 | return NULL; | |
487 | } | |
a2fb1b05 | 488 | |
2fd32231 ILT |
489 | // By default the GNU linker sorts input sections whose names match |
490 | // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*. The sections | |
491 | // are sorted by name. This is used to implement constructor | |
492 | // priority ordering. We are compatible. | |
493 | if (!this->script_options_->saw_sections_clause() | |
494 | && (is_prefix_of(".ctors.", name) | |
495 | || is_prefix_of(".dtors.", name) | |
496 | || is_prefix_of(".init_array.", name) | |
497 | || is_prefix_of(".fini_array.", name))) | |
498 | os->set_must_sort_attached_input_sections(); | |
499 | ||
a2fb1b05 ILT |
500 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
501 | ||
a445fddf ILT |
502 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx, |
503 | this->script_options_->saw_sections_clause()); | |
a2fb1b05 ILT |
504 | |
505 | return os; | |
506 | } | |
507 | ||
6a74a719 ILT |
508 | // Handle a relocation section when doing a relocatable link. |
509 | ||
510 | template<int size, bool big_endian> | |
511 | Output_section* | |
512 | Layout::layout_reloc(Sized_relobj<size, big_endian>* object, | |
513 | unsigned int, | |
514 | const elfcpp::Shdr<size, big_endian>& shdr, | |
515 | Output_section* data_section, | |
516 | Relocatable_relocs* rr) | |
517 | { | |
8851ecca ILT |
518 | gold_assert(parameters->options().relocatable() |
519 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
520 | |
521 | int sh_type = shdr.get_sh_type(); | |
522 | ||
523 | std::string name; | |
524 | if (sh_type == elfcpp::SHT_REL) | |
525 | name = ".rel"; | |
526 | else if (sh_type == elfcpp::SHT_RELA) | |
527 | name = ".rela"; | |
528 | else | |
529 | gold_unreachable(); | |
530 | name += data_section->name(); | |
531 | ||
532 | Output_section* os = this->choose_output_section(object, name.c_str(), | |
533 | sh_type, | |
534 | shdr.get_sh_flags(), | |
535 | false); | |
536 | ||
537 | os->set_should_link_to_symtab(); | |
538 | os->set_info_section(data_section); | |
539 | ||
540 | Output_section_data* posd; | |
541 | if (sh_type == elfcpp::SHT_REL) | |
542 | { | |
543 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); | |
544 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, | |
545 | size, | |
546 | big_endian>(rr); | |
547 | } | |
548 | else if (sh_type == elfcpp::SHT_RELA) | |
549 | { | |
550 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); | |
551 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, | |
552 | size, | |
553 | big_endian>(rr); | |
554 | } | |
555 | else | |
556 | gold_unreachable(); | |
557 | ||
558 | os->add_output_section_data(posd); | |
559 | rr->set_output_data(posd); | |
560 | ||
561 | return os; | |
562 | } | |
563 | ||
564 | // Handle a group section when doing a relocatable link. | |
565 | ||
566 | template<int size, bool big_endian> | |
567 | void | |
568 | Layout::layout_group(Symbol_table* symtab, | |
569 | Sized_relobj<size, big_endian>* object, | |
570 | unsigned int, | |
571 | const char* group_section_name, | |
572 | const char* signature, | |
573 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
574 | elfcpp::Elf_Word flags, |
575 | std::vector<unsigned int>* shndxes) | |
6a74a719 | 576 | { |
8851ecca | 577 | gold_assert(parameters->options().relocatable()); |
6a74a719 ILT |
578 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
579 | group_section_name = this->namepool_.add(group_section_name, true, NULL); | |
580 | Output_section* os = this->make_output_section(group_section_name, | |
581 | elfcpp::SHT_GROUP, | |
582 | shdr.get_sh_flags()); | |
583 | ||
584 | // We need to find a symbol with the signature in the symbol table. | |
755ab8af | 585 | // If we don't find one now, we need to look again later. |
6a74a719 | 586 | Symbol* sym = symtab->lookup(signature, NULL); |
755ab8af ILT |
587 | if (sym != NULL) |
588 | os->set_info_symndx(sym); | |
589 | else | |
590 | { | |
e55bde5e ILT |
591 | // Reserve some space to minimize reallocations. |
592 | if (this->group_signatures_.empty()) | |
593 | this->group_signatures_.reserve(this->number_of_input_files_ * 16); | |
594 | ||
755ab8af ILT |
595 | // We will wind up using a symbol whose name is the signature. |
596 | // So just put the signature in the symbol name pool to save it. | |
597 | signature = symtab->canonicalize_name(signature); | |
598 | this->group_signatures_.push_back(Group_signature(os, signature)); | |
599 | } | |
6a74a719 ILT |
600 | |
601 | os->set_should_link_to_symtab(); | |
6a74a719 ILT |
602 | os->set_entsize(4); |
603 | ||
604 | section_size_type entry_count = | |
605 | convert_to_section_size_type(shdr.get_sh_size() / 4); | |
606 | Output_section_data* posd = | |
8825ac63 ILT |
607 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
608 | shndxes); | |
6a74a719 ILT |
609 | os->add_output_section_data(posd); |
610 | } | |
611 | ||
730cdc88 ILT |
612 | // Special GNU handling of sections name .eh_frame. They will |
613 | // normally hold exception frame data as defined by the C++ ABI | |
614 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
615 | |
616 | template<int size, bool big_endian> | |
730cdc88 ILT |
617 | Output_section* |
618 | Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object, | |
619 | const unsigned char* symbols, | |
620 | off_t symbols_size, | |
621 | const unsigned char* symbol_names, | |
622 | off_t symbol_names_size, | |
3151305a | 623 | unsigned int shndx, |
3151305a | 624 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
625 | unsigned int reloc_shndx, unsigned int reloc_type, |
626 | off_t* off) | |
3151305a | 627 | { |
730cdc88 | 628 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS); |
1650c4ff | 629 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 | 630 | |
a445fddf ILT |
631 | const char* const name = ".eh_frame"; |
632 | Output_section* os = this->choose_output_section(object, | |
633 | name, | |
634 | elfcpp::SHT_PROGBITS, | |
635 | elfcpp::SHF_ALLOC, | |
636 | false); | |
637 | if (os == NULL) | |
638 | return NULL; | |
730cdc88 | 639 | |
3151305a ILT |
640 | if (this->eh_frame_section_ == NULL) |
641 | { | |
642 | this->eh_frame_section_ = os; | |
730cdc88 | 643 | this->eh_frame_data_ = new Eh_frame(); |
3151305a | 644 | |
e55bde5e | 645 | if (parameters->options().eh_frame_hdr()) |
3151305a | 646 | { |
3151305a | 647 | Output_section* hdr_os = |
a445fddf ILT |
648 | this->choose_output_section(NULL, |
649 | ".eh_frame_hdr", | |
650 | elfcpp::SHT_PROGBITS, | |
651 | elfcpp::SHF_ALLOC, | |
652 | false); | |
3151305a | 653 | |
a445fddf ILT |
654 | if (hdr_os != NULL) |
655 | { | |
656 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, | |
657 | this->eh_frame_data_); | |
658 | hdr_os->add_output_section_data(hdr_posd); | |
3151305a | 659 | |
a445fddf | 660 | hdr_os->set_after_input_sections(); |
730cdc88 | 661 | |
1c4f3631 ILT |
662 | if (!this->script_options_->saw_phdrs_clause()) |
663 | { | |
664 | Output_segment* hdr_oseg; | |
665 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, | |
666 | elfcpp::PF_R); | |
667 | hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R); | |
668 | } | |
730cdc88 | 669 | |
a445fddf ILT |
670 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); |
671 | } | |
3151305a ILT |
672 | } |
673 | } | |
674 | ||
675 | gold_assert(this->eh_frame_section_ == os); | |
676 | ||
730cdc88 ILT |
677 | if (this->eh_frame_data_->add_ehframe_input_section(object, |
678 | symbols, | |
679 | symbols_size, | |
680 | symbol_names, | |
681 | symbol_names_size, | |
682 | shndx, | |
683 | reloc_shndx, | |
684 | reloc_type)) | |
2c38906f | 685 | { |
154e0e9a ILT |
686 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
687 | ||
2c38906f ILT |
688 | // We found a .eh_frame section we are going to optimize, so now |
689 | // we can add the set of optimized sections to the output | |
690 | // section. We need to postpone adding this until we've found a | |
691 | // section we can optimize so that the .eh_frame section in | |
692 | // crtbegin.o winds up at the start of the output section. | |
693 | if (!this->added_eh_frame_data_) | |
694 | { | |
695 | os->add_output_section_data(this->eh_frame_data_); | |
696 | this->added_eh_frame_data_ = true; | |
697 | } | |
698 | *off = -1; | |
699 | } | |
730cdc88 ILT |
700 | else |
701 | { | |
702 | // We couldn't handle this .eh_frame section for some reason. | |
703 | // Add it as a normal section. | |
a445fddf ILT |
704 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); |
705 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx, | |
706 | saw_sections_clause); | |
730cdc88 ILT |
707 | } |
708 | ||
709 | return os; | |
3151305a ILT |
710 | } |
711 | ||
9f1d377b ILT |
712 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
713 | // the output section. | |
ead1e424 | 714 | |
9f1d377b | 715 | Output_section* |
ead1e424 ILT |
716 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
717 | elfcpp::Elf_Xword flags, | |
718 | Output_section_data* posd) | |
719 | { | |
a445fddf ILT |
720 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
721 | false); | |
722 | if (os != NULL) | |
723 | os->add_output_section_data(posd); | |
9f1d377b | 724 | return os; |
ead1e424 ILT |
725 | } |
726 | ||
a2fb1b05 ILT |
727 | // Map section flags to segment flags. |
728 | ||
729 | elfcpp::Elf_Word | |
730 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
731 | { | |
732 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
733 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
734 | ret |= elfcpp::PF_W; | |
735 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
736 | ret |= elfcpp::PF_X; | |
737 | return ret; | |
738 | } | |
739 | ||
96803768 ILT |
740 | // Sometimes we compress sections. This is typically done for |
741 | // sections that are not part of normal program execution (such as | |
742 | // .debug_* sections), and where the readers of these sections know | |
743 | // how to deal with compressed sections. (To make it easier for them, | |
744 | // we will rename the ouput section in such cases from .foo to | |
745 | // .foo.zlib.nnnn, where nnnn is the uncompressed size.) This routine | |
746 | // doesn't say for certain whether we'll compress -- it depends on | |
747 | // commandline options as well -- just whether this section is a | |
748 | // candidate for compression. | |
749 | ||
750 | static bool | |
751 | is_compressible_debug_section(const char* secname) | |
752 | { | |
753 | return (strncmp(secname, ".debug", sizeof(".debug") - 1) == 0); | |
754 | } | |
755 | ||
a2fb1b05 ILT |
756 | // Make a new Output_section, and attach it to segments as |
757 | // appropriate. | |
758 | ||
759 | Output_section* | |
760 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
761 | elfcpp::Elf_Xword flags) | |
762 | { | |
96803768 ILT |
763 | Output_section* os; |
764 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 765 | && strcmp(parameters->options().compress_debug_sections(), "none") != 0 |
96803768 | 766 | && is_compressible_debug_section(name)) |
e55bde5e ILT |
767 | os = new Output_compressed_section(¶meters->options(), name, type, |
768 | flags); | |
62b01cb5 ILT |
769 | |
770 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 771 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
772 | && strcmp(".debug_abbrev", name) == 0) |
773 | { | |
774 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( | |
775 | name, type, flags); | |
776 | if (this->debug_info_) | |
777 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
778 | } | |
779 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
e55bde5e | 780 | && parameters->options().strip_debug_non_line() |
62b01cb5 ILT |
781 | && strcmp(".debug_info", name) == 0) |
782 | { | |
783 | os = this->debug_info_ = new Output_reduced_debug_info_section( | |
784 | name, type, flags); | |
785 | if (this->debug_abbrev_) | |
786 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
787 | } | |
788 | else | |
96803768 ILT |
789 | os = new Output_section(name, type, flags); |
790 | ||
a3ad94ed | 791 | this->section_list_.push_back(os); |
a2fb1b05 | 792 | |
2fd32231 ILT |
793 | // The GNU linker by default sorts some sections by priority, so we |
794 | // do the same. We need to know that this might happen before we | |
795 | // attach any input sections. | |
796 | if (!this->script_options_->saw_sections_clause() | |
797 | && (strcmp(name, ".ctors") == 0 | |
798 | || strcmp(name, ".dtors") == 0 | |
799 | || strcmp(name, ".init_array") == 0 | |
800 | || strcmp(name, ".fini_array") == 0)) | |
801 | os->set_may_sort_attached_input_sections(); | |
802 | ||
9f1d377b ILT |
803 | // With -z relro, we have to recognize the special sections by name. |
804 | // There is no other way. | |
805 | if (!this->script_options_->saw_sections_clause() | |
806 | && parameters->options().relro() | |
807 | && type == elfcpp::SHT_PROGBITS | |
808 | && (flags & elfcpp::SHF_ALLOC) != 0 | |
809 | && (flags & elfcpp::SHF_WRITE) != 0) | |
810 | { | |
811 | if (strcmp(name, ".data.rel.ro") == 0) | |
812 | os->set_is_relro(); | |
813 | else if (strcmp(name, ".data.rel.ro.local") == 0) | |
814 | { | |
815 | os->set_is_relro(); | |
816 | os->set_is_relro_local(); | |
817 | } | |
818 | } | |
819 | ||
154e0e9a ILT |
820 | // If we have already attached the sections to segments, then we |
821 | // need to attach this one now. This happens for sections created | |
822 | // directly by the linker. | |
823 | if (this->sections_are_attached_) | |
824 | this->attach_section_to_segment(os); | |
825 | ||
4e2b1697 ILT |
826 | return os; |
827 | } | |
a445fddf | 828 | |
154e0e9a ILT |
829 | // Attach output sections to segments. This is called after we have |
830 | // seen all the input sections. | |
831 | ||
832 | void | |
833 | Layout::attach_sections_to_segments() | |
834 | { | |
835 | for (Section_list::iterator p = this->section_list_.begin(); | |
836 | p != this->section_list_.end(); | |
837 | ++p) | |
838 | this->attach_section_to_segment(*p); | |
839 | ||
840 | this->sections_are_attached_ = true; | |
841 | } | |
842 | ||
843 | // Attach an output section to a segment. | |
844 | ||
845 | void | |
846 | Layout::attach_section_to_segment(Output_section* os) | |
847 | { | |
848 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
849 | this->unattached_section_list_.push_back(os); | |
850 | else | |
851 | this->attach_allocated_section_to_segment(os); | |
852 | } | |
853 | ||
4e2b1697 | 854 | // Attach an allocated output section to a segment. |
1c4f3631 | 855 | |
4e2b1697 | 856 | void |
154e0e9a | 857 | Layout::attach_allocated_section_to_segment(Output_section* os) |
4e2b1697 | 858 | { |
154e0e9a | 859 | elfcpp::Elf_Xword flags = os->flags(); |
4e2b1697 | 860 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
a2fb1b05 | 861 | |
4e2b1697 ILT |
862 | if (parameters->options().relocatable()) |
863 | return; | |
a2fb1b05 | 864 | |
4e2b1697 ILT |
865 | // If we have a SECTIONS clause, we can't handle the attachment to |
866 | // segments until after we've seen all the sections. | |
867 | if (this->script_options_->saw_sections_clause()) | |
868 | return; | |
a2fb1b05 | 869 | |
4e2b1697 | 870 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
756ac4a8 | 871 | |
4e2b1697 | 872 | // This output section goes into a PT_LOAD segment. |
a2fb1b05 | 873 | |
4e2b1697 | 874 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
a2fb1b05 | 875 | |
4e2b1697 ILT |
876 | // In general the only thing we really care about for PT_LOAD |
877 | // segments is whether or not they are writable, so that is how we | |
878 | // search for them. People who need segments sorted on some other | |
879 | // basis will have to use a linker script. | |
a2fb1b05 | 880 | |
4e2b1697 ILT |
881 | Segment_list::const_iterator p; |
882 | for (p = this->segment_list_.begin(); | |
883 | p != this->segment_list_.end(); | |
884 | ++p) | |
885 | { | |
886 | if ((*p)->type() == elfcpp::PT_LOAD | |
af6156ef ILT |
887 | && (parameters->options().omagic() |
888 | || ((*p)->flags() & elfcpp::PF_W) == (seg_flags & elfcpp::PF_W))) | |
4e2b1697 ILT |
889 | { |
890 | // If -Tbss was specified, we need to separate the data | |
891 | // and BSS segments. | |
e55bde5e | 892 | if (parameters->options().user_set_Tbss()) |
4e2b1697 ILT |
893 | { |
894 | if ((os->type() == elfcpp::SHT_NOBITS) | |
895 | == (*p)->has_any_data_sections()) | |
896 | continue; | |
897 | } | |
898 | ||
899 | (*p)->add_output_section(os, seg_flags); | |
900 | break; | |
901 | } | |
902 | } | |
54dc6425 | 903 | |
4e2b1697 ILT |
904 | if (p == this->segment_list_.end()) |
905 | { | |
906 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, | |
907 | seg_flags); | |
908 | oseg->add_output_section(os, seg_flags); | |
a2fb1b05 ILT |
909 | } |
910 | ||
4e2b1697 ILT |
911 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
912 | // segment. | |
913 | if (os->type() == elfcpp::SHT_NOTE) | |
914 | { | |
915 | // See if we already have an equivalent PT_NOTE segment. | |
916 | for (p = this->segment_list_.begin(); | |
917 | p != segment_list_.end(); | |
918 | ++p) | |
919 | { | |
920 | if ((*p)->type() == elfcpp::PT_NOTE | |
921 | && (((*p)->flags() & elfcpp::PF_W) | |
922 | == (seg_flags & elfcpp::PF_W))) | |
923 | { | |
924 | (*p)->add_output_section(os, seg_flags); | |
925 | break; | |
926 | } | |
927 | } | |
928 | ||
929 | if (p == this->segment_list_.end()) | |
930 | { | |
931 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, | |
932 | seg_flags); | |
933 | oseg->add_output_section(os, seg_flags); | |
934 | } | |
935 | } | |
936 | ||
937 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
938 | // segment. There can only be one such segment. | |
939 | if ((flags & elfcpp::SHF_TLS) != 0) | |
940 | { | |
941 | if (this->tls_segment_ == NULL) | |
2d924fd9 | 942 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
4e2b1697 ILT |
943 | this->tls_segment_->add_output_section(os, seg_flags); |
944 | } | |
9f1d377b ILT |
945 | |
946 | // If -z relro is in effect, and we see a relro section, we create a | |
947 | // PT_GNU_RELRO segment. There can only be one such segment. | |
948 | if (os->is_relro() && parameters->options().relro()) | |
949 | { | |
950 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); | |
951 | if (this->relro_segment_ == NULL) | |
2d924fd9 | 952 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
9f1d377b ILT |
953 | this->relro_segment_->add_output_section(os, seg_flags); |
954 | } | |
a2fb1b05 ILT |
955 | } |
956 | ||
919ed24c ILT |
957 | // Make an output section for a script. |
958 | ||
959 | Output_section* | |
960 | Layout::make_output_section_for_script(const char* name) | |
961 | { | |
962 | name = this->namepool_.add(name, false, NULL); | |
963 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, | |
964 | elfcpp::SHF_ALLOC); | |
965 | os->set_found_in_sections_clause(); | |
966 | return os; | |
967 | } | |
968 | ||
3802b2dd ILT |
969 | // Return the number of segments we expect to see. |
970 | ||
971 | size_t | |
972 | Layout::expected_segment_count() const | |
973 | { | |
974 | size_t ret = this->segment_list_.size(); | |
975 | ||
976 | // If we didn't see a SECTIONS clause in a linker script, we should | |
977 | // already have the complete list of segments. Otherwise we ask the | |
978 | // SECTIONS clause how many segments it expects, and add in the ones | |
979 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) | |
980 | ||
981 | if (!this->script_options_->saw_sections_clause()) | |
982 | return ret; | |
983 | else | |
984 | { | |
985 | const Script_sections* ss = this->script_options_->script_sections(); | |
986 | return ret + ss->expected_segment_count(this); | |
987 | } | |
988 | } | |
989 | ||
35cdfc9a ILT |
990 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
991 | // is whether we saw a .note.GNU-stack section in the object file. | |
992 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
993 | // protection required for stack memory. We record this in an | |
994 | // executable as a PT_GNU_STACK segment. If an object file does not | |
995 | // have a .note.GNU-stack segment, we must assume that it is an old | |
996 | // object. On some targets that will force an executable stack. | |
997 | ||
998 | void | |
999 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags) | |
1000 | { | |
1001 | if (!seen_gnu_stack) | |
1002 | this->input_without_gnu_stack_note_ = true; | |
1003 | else | |
1004 | { | |
1005 | this->input_with_gnu_stack_note_ = true; | |
1006 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
1007 | this->input_requires_executable_stack_ = true; | |
1008 | } | |
1009 | } | |
1010 | ||
a3ad94ed ILT |
1011 | // Create the dynamic sections which are needed before we read the |
1012 | // relocs. | |
1013 | ||
1014 | void | |
9b07f471 | 1015 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
a3ad94ed | 1016 | { |
436ca963 | 1017 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
1018 | return; |
1019 | ||
3802b2dd ILT |
1020 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
1021 | elfcpp::SHT_DYNAMIC, | |
1022 | (elfcpp::SHF_ALLOC | |
1023 | | elfcpp::SHF_WRITE), | |
1024 | false); | |
9f1d377b | 1025 | this->dynamic_section_->set_is_relro(); |
a3ad94ed | 1026 | |
9b07f471 | 1027 | symtab->define_in_output_data("_DYNAMIC", NULL, this->dynamic_section_, 0, 0, |
a3ad94ed ILT |
1028 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, |
1029 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 1030 | |
9025d29d | 1031 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 ILT |
1032 | |
1033 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); | |
a3ad94ed ILT |
1034 | } |
1035 | ||
bfd58944 ILT |
1036 | // For each output section whose name can be represented as C symbol, |
1037 | // define __start and __stop symbols for the section. This is a GNU | |
1038 | // extension. | |
1039 | ||
1040 | void | |
9b07f471 | 1041 | Layout::define_section_symbols(Symbol_table* symtab) |
bfd58944 ILT |
1042 | { |
1043 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1044 | p != this->section_list_.end(); | |
1045 | ++p) | |
1046 | { | |
1047 | const char* const name = (*p)->name(); | |
1048 | if (name[strspn(name, | |
1049 | ("0123456789" | |
1050 | "ABCDEFGHIJKLMNOPWRSTUVWXYZ" | |
1051 | "abcdefghijklmnopqrstuvwxyz" | |
1052 | "_"))] | |
1053 | == '\0') | |
1054 | { | |
1055 | const std::string name_string(name); | |
1056 | const std::string start_name("__start_" + name_string); | |
1057 | const std::string stop_name("__stop_" + name_string); | |
1058 | ||
9b07f471 | 1059 | symtab->define_in_output_data(start_name.c_str(), |
bfd58944 ILT |
1060 | NULL, // version |
1061 | *p, | |
1062 | 0, // value | |
1063 | 0, // symsize | |
1064 | elfcpp::STT_NOTYPE, | |
1065 | elfcpp::STB_GLOBAL, | |
1066 | elfcpp::STV_DEFAULT, | |
1067 | 0, // nonvis | |
1068 | false, // offset_is_from_end | |
a445fddf | 1069 | true); // only_if_ref |
bfd58944 | 1070 | |
9b07f471 | 1071 | symtab->define_in_output_data(stop_name.c_str(), |
bfd58944 ILT |
1072 | NULL, // version |
1073 | *p, | |
1074 | 0, // value | |
1075 | 0, // symsize | |
1076 | elfcpp::STT_NOTYPE, | |
1077 | elfcpp::STB_GLOBAL, | |
1078 | elfcpp::STV_DEFAULT, | |
1079 | 0, // nonvis | |
1080 | true, // offset_is_from_end | |
a445fddf | 1081 | true); // only_if_ref |
bfd58944 ILT |
1082 | } |
1083 | } | |
1084 | } | |
1085 | ||
755ab8af ILT |
1086 | // Define symbols for group signatures. |
1087 | ||
1088 | void | |
1089 | Layout::define_group_signatures(Symbol_table* symtab) | |
1090 | { | |
1091 | for (Group_signatures::iterator p = this->group_signatures_.begin(); | |
1092 | p != this->group_signatures_.end(); | |
1093 | ++p) | |
1094 | { | |
1095 | Symbol* sym = symtab->lookup(p->signature, NULL); | |
1096 | if (sym != NULL) | |
1097 | p->section->set_info_symndx(sym); | |
1098 | else | |
1099 | { | |
1100 | // Force the name of the group section to the group | |
1101 | // signature, and use the group's section symbol as the | |
1102 | // signature symbol. | |
1103 | if (strcmp(p->section->name(), p->signature) != 0) | |
1104 | { | |
1105 | const char* name = this->namepool_.add(p->signature, | |
1106 | true, NULL); | |
1107 | p->section->set_name(name); | |
1108 | } | |
1109 | p->section->set_needs_symtab_index(); | |
1110 | p->section->set_info_section_symndx(p->section); | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | this->group_signatures_.clear(); | |
1115 | } | |
1116 | ||
75f65a3e ILT |
1117 | // Find the first read-only PT_LOAD segment, creating one if |
1118 | // necessary. | |
54dc6425 | 1119 | |
75f65a3e ILT |
1120 | Output_segment* |
1121 | Layout::find_first_load_seg() | |
54dc6425 | 1122 | { |
75f65a3e ILT |
1123 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
1124 | p != this->segment_list_.end(); | |
1125 | ++p) | |
1126 | { | |
1127 | if ((*p)->type() == elfcpp::PT_LOAD | |
1128 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
af6156ef ILT |
1129 | && (parameters->options().omagic() |
1130 | || ((*p)->flags() & elfcpp::PF_W) == 0)) | |
75f65a3e ILT |
1131 | return *p; |
1132 | } | |
1133 | ||
1c4f3631 ILT |
1134 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
1135 | ||
3802b2dd ILT |
1136 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
1137 | elfcpp::PF_R); | |
75f65a3e | 1138 | return load_seg; |
54dc6425 ILT |
1139 | } |
1140 | ||
1141 | // Finalize the layout. When this is called, we have created all the | |
1142 | // output sections and all the output segments which are based on | |
1143 | // input sections. We have several things to do, and we have to do | |
1144 | // them in the right order, so that we get the right results correctly | |
1145 | // and efficiently. | |
1146 | ||
1147 | // 1) Finalize the list of output segments and create the segment | |
1148 | // table header. | |
1149 | ||
1150 | // 2) Finalize the dynamic symbol table and associated sections. | |
1151 | ||
1152 | // 3) Determine the final file offset of all the output segments. | |
1153 | ||
1154 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
1155 | // sections. | |
1156 | ||
75f65a3e ILT |
1157 | // 5) Create the symbol table sections and the section name table |
1158 | // section. | |
1159 | ||
1160 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
1161 | // value and make a final determination of which symbols are going |
1162 | // into the output symbol table. | |
1163 | ||
54dc6425 ILT |
1164 | // 7) Create the section table header. |
1165 | ||
1166 | // 8) Determine the final file offset of all the output sections which | |
1167 | // are not SHF_ALLOC, including the section table header. | |
1168 | ||
1169 | // 9) Finalize the ELF file header. | |
1170 | ||
75f65a3e ILT |
1171 | // This function returns the size of the output file. |
1172 | ||
1173 | off_t | |
17a1d0a9 | 1174 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
8851ecca | 1175 | Target* target, const Task* task) |
54dc6425 | 1176 | { |
7e1edb90 | 1177 | target->finalize_sections(this); |
5a6f7e2d | 1178 | |
17a1d0a9 | 1179 | this->count_local_symbols(task, input_objects); |
7bf1f802 | 1180 | |
35cdfc9a ILT |
1181 | this->create_gold_note(); |
1182 | this->create_executable_stack_info(target); | |
8ed814a9 | 1183 | this->create_build_id(); |
4f211c8b | 1184 | |
3802b2dd | 1185 | Output_segment* phdr_seg = NULL; |
8851ecca | 1186 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
54dc6425 | 1187 | { |
dbe717ef ILT |
1188 | // There was a dynamic object in the link. We need to create |
1189 | // some information for the dynamic linker. | |
1190 | ||
3802b2dd ILT |
1191 | // Create the PT_PHDR segment which will hold the program |
1192 | // headers. | |
1c4f3631 ILT |
1193 | if (!this->script_options_->saw_phdrs_clause()) |
1194 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
3802b2dd | 1195 | |
14b31740 ILT |
1196 | // Create the dynamic symbol table, including the hash table. |
1197 | Output_section* dynstr; | |
1198 | std::vector<Symbol*> dynamic_symbols; | |
1199 | unsigned int local_dynamic_count; | |
a5dc0706 ILT |
1200 | Versions versions(*this->script_options()->version_script_info(), |
1201 | &this->dynpool_); | |
9b07f471 | 1202 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
14b31740 ILT |
1203 | &local_dynamic_count, &dynamic_symbols, |
1204 | &versions); | |
dbe717ef ILT |
1205 | |
1206 | // Create the .interp section to hold the name of the | |
1207 | // interpreter, and put it in a PT_INTERP segment. | |
8851ecca | 1208 | if (!parameters->options().shared()) |
96f2030e | 1209 | this->create_interp(target); |
a3ad94ed ILT |
1210 | |
1211 | // Finish the .dynamic section to hold the dynamic data, and put | |
1212 | // it in a PT_DYNAMIC segment. | |
16649710 | 1213 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
1214 | |
1215 | // We should have added everything we need to the dynamic string | |
1216 | // table. | |
1217 | this->dynpool_.set_string_offsets(); | |
1218 | ||
1219 | // Create the version sections. We can't do this until the | |
1220 | // dynamic string table is complete. | |
46fe1623 | 1221 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
14b31740 | 1222 | dynamic_symbols, dynstr); |
54dc6425 | 1223 | } |
3ce2c28e ILT |
1224 | |
1225 | if (this->incremental_inputs_) | |
1226 | { | |
1227 | this->incremental_inputs_->finalize(); | |
1228 | this->create_incremental_info_sections(); | |
1229 | } | |
54dc6425 | 1230 | |
a445fddf ILT |
1231 | // If there is a SECTIONS clause, put all the input sections into |
1232 | // the required order. | |
1233 | Output_segment* load_seg; | |
88dd47ac | 1234 | if (this->script_options_->saw_sections_clause()) |
a445fddf | 1235 | load_seg = this->set_section_addresses_from_script(symtab); |
8851ecca | 1236 | else if (parameters->options().relocatable()) |
88dd47ac | 1237 | load_seg = NULL; |
a445fddf ILT |
1238 | else |
1239 | load_seg = this->find_first_load_seg(); | |
54dc6425 | 1240 | |
e55bde5e ILT |
1241 | if (parameters->options().oformat_enum() |
1242 | != General_options::OBJECT_FORMAT_ELF) | |
516cb3d0 ILT |
1243 | load_seg = NULL; |
1244 | ||
3802b2dd | 1245 | gold_assert(phdr_seg == NULL || load_seg != NULL); |
75f65a3e ILT |
1246 | |
1247 | // Lay out the segment headers. | |
75f65a3e | 1248 | Output_segment_headers* segment_headers; |
8851ecca | 1249 | if (parameters->options().relocatable()) |
6a74a719 ILT |
1250 | segment_headers = NULL; |
1251 | else | |
1252 | { | |
1253 | segment_headers = new Output_segment_headers(this->segment_list_); | |
1254 | if (load_seg != NULL) | |
1255 | load_seg->add_initial_output_data(segment_headers); | |
1256 | if (phdr_seg != NULL) | |
1257 | phdr_seg->add_initial_output_data(segment_headers); | |
1258 | } | |
75f65a3e ILT |
1259 | |
1260 | // Lay out the file header. | |
1261 | Output_file_header* file_header; | |
d391083d | 1262 | file_header = new Output_file_header(target, symtab, segment_headers, |
e55bde5e | 1263 | parameters->options().entry()); |
a445fddf ILT |
1264 | if (load_seg != NULL) |
1265 | load_seg->add_initial_output_data(file_header); | |
1266 | ||
61ba1cf9 | 1267 | this->special_output_list_.push_back(file_header); |
6a74a719 ILT |
1268 | if (segment_headers != NULL) |
1269 | this->special_output_list_.push_back(segment_headers); | |
75f65a3e | 1270 | |
6a74a719 | 1271 | if (this->script_options_->saw_phdrs_clause() |
8851ecca | 1272 | && !parameters->options().relocatable()) |
1c4f3631 ILT |
1273 | { |
1274 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS | |
1275 | // clause in a linker script. | |
1276 | Script_sections* ss = this->script_options_->script_sections(); | |
1277 | ss->put_headers_in_phdrs(file_header, segment_headers); | |
1278 | } | |
1279 | ||
ead1e424 | 1280 | // We set the output section indexes in set_segment_offsets and |
27bc2bce | 1281 | // set_section_indexes. |
ead1e424 ILT |
1282 | unsigned int shndx = 1; |
1283 | ||
1284 | // Set the file offsets of all the segments, and all the sections | |
1285 | // they contain. | |
6a74a719 | 1286 | off_t off; |
8851ecca | 1287 | if (!parameters->options().relocatable()) |
6a74a719 ILT |
1288 | off = this->set_segment_offsets(target, load_seg, &shndx); |
1289 | else | |
1290 | off = this->set_relocatable_section_offsets(file_header, &shndx); | |
75f65a3e | 1291 | |
a9a60db6 ILT |
1292 | // Set the file offsets of all the non-data sections we've seen so |
1293 | // far which don't have to wait for the input sections. We need | |
1294 | // this in order to finalize local symbols in non-allocated | |
1295 | // sections. | |
1296 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); | |
1297 | ||
d491d34e ILT |
1298 | // Set the section indexes of all unallocated sections seen so far, |
1299 | // in case any of them are somehow referenced by a symbol. | |
1300 | shndx = this->set_section_indexes(shndx); | |
1301 | ||
75f65a3e | 1302 | // Create the symbol table sections. |
d491d34e | 1303 | this->create_symtab_sections(input_objects, symtab, shndx, &off); |
7bf1f802 ILT |
1304 | if (!parameters->doing_static_link()) |
1305 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e | 1306 | |
e5756efb ILT |
1307 | // Process any symbol assignments from a linker script. This must |
1308 | // be called after the symbol table has been finalized. | |
1309 | this->script_options_->finalize_symbols(symtab, this); | |
1310 | ||
75f65a3e ILT |
1311 | // Create the .shstrtab section. |
1312 | Output_section* shstrtab_section = this->create_shstrtab(); | |
1313 | ||
a9a60db6 ILT |
1314 | // Set the file offsets of the rest of the non-data sections which |
1315 | // don't have to wait for the input sections. | |
9a0910c3 | 1316 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 | 1317 | |
d491d34e ILT |
1318 | // Now that all sections have been created, set the section indexes |
1319 | // for any sections which haven't been done yet. | |
86887060 | 1320 | shndx = this->set_section_indexes(shndx); |
ead1e424 | 1321 | |
75f65a3e | 1322 | // Create the section table header. |
d491d34e | 1323 | this->create_shdrs(shstrtab_section, &off); |
75f65a3e | 1324 | |
17a1d0a9 ILT |
1325 | // If there are no sections which require postprocessing, we can |
1326 | // handle the section names now, and avoid a resize later. | |
1327 | if (!this->any_postprocessing_sections_) | |
1328 | off = this->set_section_offsets(off, | |
1329 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
1330 | ||
27bc2bce | 1331 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 1332 | |
27bc2bce ILT |
1333 | // Now we know exactly where everything goes in the output file |
1334 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 1335 | Output_data::layout_complete(); |
75f65a3e | 1336 | |
e44fcf3b ILT |
1337 | this->output_file_size_ = off; |
1338 | ||
75f65a3e ILT |
1339 | return off; |
1340 | } | |
1341 | ||
8ed814a9 ILT |
1342 | // Create a note header following the format defined in the ELF ABI. |
1343 | // NAME is the name, NOTE_TYPE is the type, DESCSZ is the size of the | |
1344 | // descriptor. ALLOCATE is true if the section should be allocated in | |
1345 | // memory. This returns the new note section. It sets | |
1346 | // *TRAILING_PADDING to the number of trailing zero bytes required. | |
4f211c8b | 1347 | |
8ed814a9 | 1348 | Output_section* |
ef4ab7a8 PP |
1349 | Layout::create_note(const char* name, int note_type, |
1350 | const char* section_name, size_t descsz, | |
8ed814a9 | 1351 | bool allocate, size_t* trailing_padding) |
4f211c8b | 1352 | { |
e2305dc0 ILT |
1353 | // Authorities all agree that the values in a .note field should |
1354 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
1355 | // they differ on what the alignment is for 64-bit binaries. | |
1356 | // The GABI says unambiguously they take 8-byte alignment: | |
1357 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
1358 | // Other documentation says alignment should always be 4 bytes: | |
1359 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
1360 | // GNU ld and GNU readelf both support the latter (at least as of | |
1361 | // version 2.16.91), and glibc always generates the latter for | |
1362 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
1363 | // here. | |
35cdfc9a | 1364 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
8851ecca | 1365 | const int size = parameters->target().get_size(); |
e2305dc0 ILT |
1366 | #else |
1367 | const int size = 32; | |
1368 | #endif | |
4f211c8b ILT |
1369 | |
1370 | // The contents of the .note section. | |
4f211c8b ILT |
1371 | size_t namesz = strlen(name) + 1; |
1372 | size_t aligned_namesz = align_address(namesz, size / 8); | |
4f211c8b | 1373 | size_t aligned_descsz = align_address(descsz, size / 8); |
4f211c8b | 1374 | |
8ed814a9 | 1375 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
4f211c8b | 1376 | |
8ed814a9 ILT |
1377 | unsigned char* buffer = new unsigned char[notehdrsz]; |
1378 | memset(buffer, 0, notehdrsz); | |
4f211c8b | 1379 | |
8851ecca | 1380 | bool is_big_endian = parameters->target().is_big_endian(); |
4f211c8b ILT |
1381 | |
1382 | if (size == 32) | |
1383 | { | |
1384 | if (!is_big_endian) | |
1385 | { | |
1386 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
1387 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
1388 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
1389 | } | |
1390 | else | |
1391 | { | |
1392 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
1393 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
1394 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
1395 | } | |
1396 | } | |
1397 | else if (size == 64) | |
1398 | { | |
1399 | if (!is_big_endian) | |
1400 | { | |
1401 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
1402 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
1403 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
1404 | } | |
1405 | else | |
1406 | { | |
1407 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
1408 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
1409 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
1410 | } | |
1411 | } | |
1412 | else | |
1413 | gold_unreachable(); | |
1414 | ||
1415 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
4f211c8b | 1416 | |
ef4ab7a8 | 1417 | const char *note_name = this->namepool_.add(section_name, false, NULL); |
8ed814a9 ILT |
1418 | elfcpp::Elf_Xword flags = 0; |
1419 | if (allocate) | |
1420 | flags = elfcpp::SHF_ALLOC; | |
4f211c8b ILT |
1421 | Output_section* os = this->make_output_section(note_name, |
1422 | elfcpp::SHT_NOTE, | |
8ed814a9 ILT |
1423 | flags); |
1424 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, | |
7d9e3d98 ILT |
1425 | size / 8, |
1426 | "** note header"); | |
8ed814a9 ILT |
1427 | os->add_output_section_data(posd); |
1428 | ||
1429 | *trailing_padding = aligned_descsz - descsz; | |
1430 | ||
1431 | return os; | |
1432 | } | |
1433 | ||
1434 | // For an executable or shared library, create a note to record the | |
1435 | // version of gold used to create the binary. | |
1436 | ||
1437 | void | |
1438 | Layout::create_gold_note() | |
1439 | { | |
1440 | if (parameters->options().relocatable()) | |
1441 | return; | |
1442 | ||
1443 | std::string desc = std::string("gold ") + gold::get_version_string(); | |
1444 | ||
1445 | size_t trailing_padding; | |
1446 | Output_section *os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, | |
ef4ab7a8 PP |
1447 | ".note.gnu.gold-version", desc.size(), |
1448 | false, &trailing_padding); | |
8ed814a9 ILT |
1449 | |
1450 | Output_section_data* posd = new Output_data_const(desc, 4); | |
4f211c8b | 1451 | os->add_output_section_data(posd); |
8ed814a9 ILT |
1452 | |
1453 | if (trailing_padding > 0) | |
1454 | { | |
7d9e3d98 | 1455 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
1456 | os->add_output_section_data(posd); |
1457 | } | |
4f211c8b ILT |
1458 | } |
1459 | ||
35cdfc9a ILT |
1460 | // Record whether the stack should be executable. This can be set |
1461 | // from the command line using the -z execstack or -z noexecstack | |
1462 | // options. Otherwise, if any input file has a .note.GNU-stack | |
1463 | // section with the SHF_EXECINSTR flag set, the stack should be | |
1464 | // executable. Otherwise, if at least one input file a | |
1465 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
1466 | // section, we use the target default for whether the stack should be | |
1467 | // executable. Otherwise, we don't generate a stack note. When | |
1468 | // generating a object file, we create a .note.GNU-stack section with | |
1469 | // the appropriate marking. When generating an executable or shared | |
1470 | // library, we create a PT_GNU_STACK segment. | |
1471 | ||
1472 | void | |
1473 | Layout::create_executable_stack_info(const Target* target) | |
1474 | { | |
1475 | bool is_stack_executable; | |
e55bde5e ILT |
1476 | if (parameters->options().is_execstack_set()) |
1477 | is_stack_executable = parameters->options().is_stack_executable(); | |
35cdfc9a ILT |
1478 | else if (!this->input_with_gnu_stack_note_) |
1479 | return; | |
1480 | else | |
1481 | { | |
1482 | if (this->input_requires_executable_stack_) | |
1483 | is_stack_executable = true; | |
1484 | else if (this->input_without_gnu_stack_note_) | |
1485 | is_stack_executable = target->is_default_stack_executable(); | |
1486 | else | |
1487 | is_stack_executable = false; | |
1488 | } | |
1489 | ||
8851ecca | 1490 | if (parameters->options().relocatable()) |
35cdfc9a ILT |
1491 | { |
1492 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
1493 | elfcpp::Elf_Xword flags = 0; | |
1494 | if (is_stack_executable) | |
1495 | flags |= elfcpp::SHF_EXECINSTR; | |
1496 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags); | |
1497 | } | |
1498 | else | |
1499 | { | |
1c4f3631 ILT |
1500 | if (this->script_options_->saw_phdrs_clause()) |
1501 | return; | |
35cdfc9a ILT |
1502 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
1503 | if (is_stack_executable) | |
1504 | flags |= elfcpp::PF_X; | |
3802b2dd | 1505 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); |
35cdfc9a ILT |
1506 | } |
1507 | } | |
1508 | ||
8ed814a9 ILT |
1509 | // If --build-id was used, set up the build ID note. |
1510 | ||
1511 | void | |
1512 | Layout::create_build_id() | |
1513 | { | |
1514 | if (!parameters->options().user_set_build_id()) | |
1515 | return; | |
1516 | ||
1517 | const char* style = parameters->options().build_id(); | |
1518 | if (strcmp(style, "none") == 0) | |
1519 | return; | |
1520 | ||
1521 | // Set DESCSZ to the size of the note descriptor. When possible, | |
1522 | // set DESC to the note descriptor contents. | |
1523 | size_t descsz; | |
1524 | std::string desc; | |
1525 | if (strcmp(style, "md5") == 0) | |
1526 | descsz = 128 / 8; | |
1527 | else if (strcmp(style, "sha1") == 0) | |
1528 | descsz = 160 / 8; | |
1529 | else if (strcmp(style, "uuid") == 0) | |
1530 | { | |
1531 | const size_t uuidsz = 128 / 8; | |
1532 | ||
1533 | char buffer[uuidsz]; | |
1534 | memset(buffer, 0, uuidsz); | |
1535 | ||
2a00e4fb | 1536 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
8ed814a9 ILT |
1537 | if (descriptor < 0) |
1538 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), | |
1539 | strerror(errno)); | |
1540 | else | |
1541 | { | |
1542 | ssize_t got = ::read(descriptor, buffer, uuidsz); | |
2a00e4fb | 1543 | release_descriptor(descriptor, true); |
8ed814a9 ILT |
1544 | if (got < 0) |
1545 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); | |
1546 | else if (static_cast<size_t>(got) != uuidsz) | |
1547 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), | |
1548 | uuidsz, got); | |
1549 | } | |
1550 | ||
1551 | desc.assign(buffer, uuidsz); | |
1552 | descsz = uuidsz; | |
1553 | } | |
1554 | else if (strncmp(style, "0x", 2) == 0) | |
1555 | { | |
1556 | hex_init(); | |
1557 | const char* p = style + 2; | |
1558 | while (*p != '\0') | |
1559 | { | |
1560 | if (hex_p(p[0]) && hex_p(p[1])) | |
1561 | { | |
1562 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); | |
1563 | desc += c; | |
1564 | p += 2; | |
1565 | } | |
1566 | else if (*p == '-' || *p == ':') | |
1567 | ++p; | |
1568 | else | |
1569 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), | |
1570 | style); | |
1571 | } | |
1572 | descsz = desc.size(); | |
1573 | } | |
1574 | else | |
1575 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); | |
1576 | ||
1577 | // Create the note. | |
1578 | size_t trailing_padding; | |
1579 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, | |
ef4ab7a8 PP |
1580 | ".note.gnu.build-id", descsz, true, |
1581 | &trailing_padding); | |
8ed814a9 ILT |
1582 | |
1583 | if (!desc.empty()) | |
1584 | { | |
1585 | // We know the value already, so we fill it in now. | |
1586 | gold_assert(desc.size() == descsz); | |
1587 | ||
1588 | Output_section_data* posd = new Output_data_const(desc, 4); | |
1589 | os->add_output_section_data(posd); | |
1590 | ||
1591 | if (trailing_padding != 0) | |
1592 | { | |
7d9e3d98 | 1593 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
1594 | os->add_output_section_data(posd); |
1595 | } | |
1596 | } | |
1597 | else | |
1598 | { | |
1599 | // We need to compute a checksum after we have completed the | |
1600 | // link. | |
1601 | gold_assert(trailing_padding == 0); | |
7d9e3d98 | 1602 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
8ed814a9 ILT |
1603 | os->add_output_section_data(this->build_id_note_); |
1604 | os->set_after_input_sections(); | |
1605 | } | |
1606 | } | |
1607 | ||
3ce2c28e ILT |
1608 | // Create .gnu_incremental_inputs and .gnu_incremental_strtab sections needed |
1609 | // for the next run of incremental linking to check what has changed. | |
1610 | ||
1611 | void | |
1612 | Layout::create_incremental_info_sections() | |
1613 | { | |
1614 | gold_assert(this->incremental_inputs_ != NULL); | |
1615 | ||
1616 | // Add the .gnu_incremental_inputs section. | |
1617 | const char *incremental_inputs_name = | |
1618 | this->namepool_.add(".gnu_incremental_inputs", false, NULL); | |
1619 | Output_section* inputs_os = | |
1620 | this->make_output_section(incremental_inputs_name, | |
1621 | elfcpp::SHT_GNU_INCREMENTAL_INPUTS, 0); | |
1622 | Output_section_data* posd = | |
1623 | this->incremental_inputs_->create_incremental_inputs_section_data(); | |
1624 | inputs_os->add_output_section_data(posd); | |
1625 | ||
1626 | // Add the .gnu_incremental_strtab section. | |
1627 | const char *incremental_strtab_name = | |
1628 | this->namepool_.add(".gnu_incremental_strtab", false, NULL); | |
1629 | Output_section* strtab_os = this->make_output_section(incremental_strtab_name, | |
1630 | elfcpp::SHT_STRTAB, | |
1631 | 0); | |
1632 | Output_data_strtab* strtab_data = | |
1633 | new Output_data_strtab(this->incremental_inputs_->get_stringpool()); | |
1634 | strtab_os->add_output_section_data(strtab_data); | |
1635 | ||
1636 | inputs_os->set_link_section(strtab_data); | |
1637 | } | |
1638 | ||
75f65a3e ILT |
1639 | // Return whether SEG1 should be before SEG2 in the output file. This |
1640 | // is based entirely on the segment type and flags. When this is | |
1641 | // called the segment addresses has normally not yet been set. | |
1642 | ||
1643 | bool | |
1644 | Layout::segment_precedes(const Output_segment* seg1, | |
1645 | const Output_segment* seg2) | |
1646 | { | |
1647 | elfcpp::Elf_Word type1 = seg1->type(); | |
1648 | elfcpp::Elf_Word type2 = seg2->type(); | |
1649 | ||
1650 | // The single PT_PHDR segment is required to precede any loadable | |
1651 | // segment. We simply make it always first. | |
1652 | if (type1 == elfcpp::PT_PHDR) | |
1653 | { | |
a3ad94ed | 1654 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
1655 | return true; |
1656 | } | |
1657 | if (type2 == elfcpp::PT_PHDR) | |
1658 | return false; | |
1659 | ||
1660 | // The single PT_INTERP segment is required to precede any loadable | |
1661 | // segment. We simply make it always second. | |
1662 | if (type1 == elfcpp::PT_INTERP) | |
1663 | { | |
a3ad94ed | 1664 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
1665 | return true; |
1666 | } | |
1667 | if (type2 == elfcpp::PT_INTERP) | |
1668 | return false; | |
1669 | ||
1670 | // We then put PT_LOAD segments before any other segments. | |
1671 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
1672 | return true; | |
1673 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
1674 | return false; | |
1675 | ||
9f1d377b ILT |
1676 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
1677 | // segment, because that is where the dynamic linker expects to find | |
1678 | // it (this is just for efficiency; other positions would also work | |
1679 | // correctly). | |
1680 | if (type1 == elfcpp::PT_TLS | |
1681 | && type2 != elfcpp::PT_TLS | |
1682 | && type2 != elfcpp::PT_GNU_RELRO) | |
1683 | return false; | |
1684 | if (type2 == elfcpp::PT_TLS | |
1685 | && type1 != elfcpp::PT_TLS | |
1686 | && type1 != elfcpp::PT_GNU_RELRO) | |
1687 | return true; | |
1688 | ||
1689 | // We put the PT_GNU_RELRO segment last, because that is where the | |
1690 | // dynamic linker expects to find it (as with PT_TLS, this is just | |
1691 | // for efficiency). | |
1692 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) | |
92e059d8 | 1693 | return false; |
9f1d377b | 1694 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
92e059d8 ILT |
1695 | return true; |
1696 | ||
75f65a3e ILT |
1697 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
1698 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
1699 | ||
1700 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
1701 | // by the numeric segment type and flags values. There should not | |
1702 | // be more than one segment with the same type and flags. | |
1703 | if (type1 != elfcpp::PT_LOAD) | |
1704 | { | |
1705 | if (type1 != type2) | |
1706 | return type1 < type2; | |
a3ad94ed | 1707 | gold_assert(flags1 != flags2); |
75f65a3e ILT |
1708 | return flags1 < flags2; |
1709 | } | |
1710 | ||
a445fddf ILT |
1711 | // If the addresses are set already, sort by load address. |
1712 | if (seg1->are_addresses_set()) | |
1713 | { | |
1714 | if (!seg2->are_addresses_set()) | |
1715 | return true; | |
1716 | ||
1717 | unsigned int section_count1 = seg1->output_section_count(); | |
1718 | unsigned int section_count2 = seg2->output_section_count(); | |
1719 | if (section_count1 == 0 && section_count2 > 0) | |
1720 | return true; | |
1721 | if (section_count1 > 0 && section_count2 == 0) | |
1722 | return false; | |
1723 | ||
1724 | uint64_t paddr1 = seg1->first_section_load_address(); | |
1725 | uint64_t paddr2 = seg2->first_section_load_address(); | |
1726 | if (paddr1 != paddr2) | |
1727 | return paddr1 < paddr2; | |
1728 | } | |
1729 | else if (seg2->are_addresses_set()) | |
1730 | return false; | |
1731 | ||
75f65a3e | 1732 | // We sort PT_LOAD segments based on the flags. Readonly segments |
756ac4a8 ILT |
1733 | // come before writable segments. Then writable segments with data |
1734 | // come before writable segments without data. Then executable | |
1735 | // segments come before non-executable segments. Then the unlikely | |
1736 | // case of a non-readable segment comes before the normal case of a | |
1737 | // readable segment. If there are multiple segments with the same | |
1738 | // type and flags, we require that the address be set, and we sort | |
1739 | // by virtual address and then physical address. | |
75f65a3e ILT |
1740 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
1741 | return (flags1 & elfcpp::PF_W) == 0; | |
756ac4a8 ILT |
1742 | if ((flags1 & elfcpp::PF_W) != 0 |
1743 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) | |
1744 | return seg1->has_any_data_sections(); | |
75f65a3e ILT |
1745 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
1746 | return (flags1 & elfcpp::PF_X) != 0; | |
1747 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
1748 | return (flags1 & elfcpp::PF_R) == 0; | |
1749 | ||
a445fddf ILT |
1750 | // We shouldn't get here--we shouldn't create segments which we |
1751 | // can't distinguish. | |
1752 | gold_unreachable(); | |
75f65a3e ILT |
1753 | } |
1754 | ||
ead1e424 ILT |
1755 | // Set the file offsets of all the segments, and all the sections they |
1756 | // contain. They have all been created. LOAD_SEG must be be laid out | |
1757 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
1758 | |
1759 | off_t | |
ead1e424 ILT |
1760 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
1761 | unsigned int *pshndx) | |
75f65a3e ILT |
1762 | { |
1763 | // Sort them into the final order. | |
54dc6425 ILT |
1764 | std::sort(this->segment_list_.begin(), this->segment_list_.end(), |
1765 | Layout::Compare_segments()); | |
1766 | ||
75f65a3e ILT |
1767 | // Find the PT_LOAD segments, and set their addresses and offsets |
1768 | // and their section's addresses and offsets. | |
0c5e9c22 | 1769 | uint64_t addr; |
e55bde5e ILT |
1770 | if (parameters->options().user_set_Ttext()) |
1771 | addr = parameters->options().Ttext(); | |
8851ecca | 1772 | else if (parameters->options().shared()) |
a445fddf | 1773 | addr = 0; |
0c5e9c22 ILT |
1774 | else |
1775 | addr = target->default_text_segment_address(); | |
75f65a3e | 1776 | off_t off = 0; |
a445fddf ILT |
1777 | |
1778 | // If LOAD_SEG is NULL, then the file header and segment headers | |
1779 | // will not be loadable. But they still need to be at offset 0 in | |
1780 | // the file. Set their offsets now. | |
1781 | if (load_seg == NULL) | |
1782 | { | |
1783 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
1784 | p != this->special_output_list_.end(); | |
1785 | ++p) | |
1786 | { | |
1787 | off = align_address(off, (*p)->addralign()); | |
1788 | (*p)->set_address_and_file_offset(0, off); | |
1789 | off += (*p)->data_size(); | |
1790 | } | |
1791 | } | |
1792 | ||
34810851 ILT |
1793 | const bool check_sections = parameters->options().check_sections(); |
1794 | Output_segment* last_load_segment = NULL; | |
1795 | ||
75f65a3e ILT |
1796 | bool was_readonly = false; |
1797 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
1798 | p != this->segment_list_.end(); | |
1799 | ++p) | |
1800 | { | |
1801 | if ((*p)->type() == elfcpp::PT_LOAD) | |
1802 | { | |
1803 | if (load_seg != NULL && load_seg != *p) | |
a3ad94ed | 1804 | gold_unreachable(); |
75f65a3e ILT |
1805 | load_seg = NULL; |
1806 | ||
756ac4a8 ILT |
1807 | bool are_addresses_set = (*p)->are_addresses_set(); |
1808 | if (are_addresses_set) | |
1809 | { | |
1810 | // When it comes to setting file offsets, we care about | |
1811 | // the physical address. | |
1812 | addr = (*p)->paddr(); | |
1813 | } | |
e55bde5e | 1814 | else if (parameters->options().user_set_Tdata() |
756ac4a8 | 1815 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
e55bde5e | 1816 | && (!parameters->options().user_set_Tbss() |
756ac4a8 ILT |
1817 | || (*p)->has_any_data_sections())) |
1818 | { | |
e55bde5e | 1819 | addr = parameters->options().Tdata(); |
756ac4a8 ILT |
1820 | are_addresses_set = true; |
1821 | } | |
e55bde5e | 1822 | else if (parameters->options().user_set_Tbss() |
756ac4a8 ILT |
1823 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
1824 | && !(*p)->has_any_data_sections()) | |
1825 | { | |
e55bde5e | 1826 | addr = parameters->options().Tbss(); |
756ac4a8 ILT |
1827 | are_addresses_set = true; |
1828 | } | |
1829 | ||
75f65a3e ILT |
1830 | uint64_t orig_addr = addr; |
1831 | uint64_t orig_off = off; | |
1832 | ||
a445fddf | 1833 | uint64_t aligned_addr = 0; |
75f65a3e | 1834 | uint64_t abi_pagesize = target->abi_pagesize(); |
af6156ef | 1835 | uint64_t common_pagesize = target->common_pagesize(); |
0496d5e5 | 1836 | |
af6156ef ILT |
1837 | if (!parameters->options().nmagic() |
1838 | && !parameters->options().omagic()) | |
1839 | (*p)->set_minimum_p_align(common_pagesize); | |
0496d5e5 | 1840 | |
a445fddf | 1841 | if (are_addresses_set) |
75f65a3e | 1842 | { |
af6156ef ILT |
1843 | if (!parameters->options().nmagic() |
1844 | && !parameters->options().omagic()) | |
1845 | { | |
1846 | // Adjust the file offset to the same address modulo | |
1847 | // the page size. | |
1848 | uint64_t unsigned_off = off; | |
1849 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) | |
1850 | | (addr & (abi_pagesize - 1))); | |
1851 | if (aligned_off < unsigned_off) | |
1852 | aligned_off += abi_pagesize; | |
1853 | off = aligned_off; | |
1854 | } | |
a445fddf ILT |
1855 | } |
1856 | else | |
1857 | { | |
1858 | // If the last segment was readonly, and this one is | |
1859 | // not, then skip the address forward one page, | |
1860 | // maintaining the same position within the page. This | |
1861 | // lets us store both segments overlapping on a single | |
1862 | // page in the file, but the loader will put them on | |
1863 | // different pages in memory. | |
1864 | ||
1865 | addr = align_address(addr, (*p)->maximum_alignment()); | |
75f65a3e | 1866 | aligned_addr = addr; |
a445fddf ILT |
1867 | |
1868 | if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0) | |
1869 | { | |
1870 | if ((addr & (abi_pagesize - 1)) != 0) | |
1871 | addr = addr + abi_pagesize; | |
1872 | } | |
1873 | ||
1874 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); | |
75f65a3e ILT |
1875 | } |
1876 | ||
ead1e424 | 1877 | unsigned int shndx_hold = *pshndx; |
96a2b4e4 ILT |
1878 | uint64_t new_addr = (*p)->set_section_addresses(this, false, addr, |
1879 | &off, pshndx); | |
75f65a3e ILT |
1880 | |
1881 | // Now that we know the size of this segment, we may be able | |
1882 | // to save a page in memory, at the cost of wasting some | |
1883 | // file space, by instead aligning to the start of a new | |
1884 | // page. Here we use the real machine page size rather than | |
1885 | // the ABI mandated page size. | |
1886 | ||
a445fddf | 1887 | if (!are_addresses_set && aligned_addr != addr) |
75f65a3e | 1888 | { |
75f65a3e ILT |
1889 | uint64_t first_off = (common_pagesize |
1890 | - (aligned_addr | |
1891 | & (common_pagesize - 1))); | |
1892 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
1893 | if (first_off > 0 | |
1894 | && last_off > 0 | |
1895 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
1896 | != (new_addr & ~ (common_pagesize - 1))) | |
1897 | && first_off + last_off <= common_pagesize) | |
1898 | { | |
ead1e424 ILT |
1899 | *pshndx = shndx_hold; |
1900 | addr = align_address(aligned_addr, common_pagesize); | |
a445fddf | 1901 | addr = align_address(addr, (*p)->maximum_alignment()); |
75f65a3e | 1902 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
96a2b4e4 ILT |
1903 | new_addr = (*p)->set_section_addresses(this, true, addr, |
1904 | &off, pshndx); | |
75f65a3e ILT |
1905 | } |
1906 | } | |
1907 | ||
1908 | addr = new_addr; | |
1909 | ||
1910 | if (((*p)->flags() & elfcpp::PF_W) == 0) | |
1911 | was_readonly = true; | |
34810851 ILT |
1912 | |
1913 | // Implement --check-sections. We know that the segments | |
1914 | // are sorted by LMA. | |
1915 | if (check_sections && last_load_segment != NULL) | |
1916 | { | |
1917 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); | |
1918 | if (last_load_segment->paddr() + last_load_segment->memsz() | |
1919 | > (*p)->paddr()) | |
1920 | { | |
1921 | unsigned long long lb1 = last_load_segment->paddr(); | |
1922 | unsigned long long le1 = lb1 + last_load_segment->memsz(); | |
1923 | unsigned long long lb2 = (*p)->paddr(); | |
1924 | unsigned long long le2 = lb2 + (*p)->memsz(); | |
1925 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " | |
1926 | "[0x%llx -> 0x%llx]"), | |
1927 | lb1, le1, lb2, le2); | |
1928 | } | |
1929 | } | |
1930 | last_load_segment = *p; | |
75f65a3e ILT |
1931 | } |
1932 | } | |
1933 | ||
1934 | // Handle the non-PT_LOAD segments, setting their offsets from their | |
1935 | // section's offsets. | |
1936 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
1937 | p != this->segment_list_.end(); | |
1938 | ++p) | |
1939 | { | |
1940 | if ((*p)->type() != elfcpp::PT_LOAD) | |
1941 | (*p)->set_offset(); | |
1942 | } | |
1943 | ||
7bf1f802 ILT |
1944 | // Set the TLS offsets for each section in the PT_TLS segment. |
1945 | if (this->tls_segment_ != NULL) | |
1946 | this->tls_segment_->set_tls_offsets(); | |
1947 | ||
75f65a3e ILT |
1948 | return off; |
1949 | } | |
1950 | ||
6a74a719 ILT |
1951 | // Set the offsets of all the allocated sections when doing a |
1952 | // relocatable link. This does the same jobs as set_segment_offsets, | |
1953 | // only for a relocatable link. | |
1954 | ||
1955 | off_t | |
1956 | Layout::set_relocatable_section_offsets(Output_data* file_header, | |
1957 | unsigned int *pshndx) | |
1958 | { | |
1959 | off_t off = 0; | |
1960 | ||
1961 | file_header->set_address_and_file_offset(0, 0); | |
1962 | off += file_header->data_size(); | |
1963 | ||
1964 | for (Section_list::iterator p = this->section_list_.begin(); | |
1965 | p != this->section_list_.end(); | |
1966 | ++p) | |
1967 | { | |
1968 | // We skip unallocated sections here, except that group sections | |
1969 | // have to come first. | |
1970 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 | |
1971 | && (*p)->type() != elfcpp::SHT_GROUP) | |
1972 | continue; | |
1973 | ||
1974 | off = align_address(off, (*p)->addralign()); | |
1975 | ||
1976 | // The linker script might have set the address. | |
1977 | if (!(*p)->is_address_valid()) | |
1978 | (*p)->set_address(0); | |
1979 | (*p)->set_file_offset(off); | |
1980 | (*p)->finalize_data_size(); | |
1981 | off += (*p)->data_size(); | |
1982 | ||
1983 | (*p)->set_out_shndx(*pshndx); | |
1984 | ++*pshndx; | |
1985 | } | |
1986 | ||
1987 | return off; | |
1988 | } | |
1989 | ||
75f65a3e ILT |
1990 | // Set the file offset of all the sections not associated with a |
1991 | // segment. | |
1992 | ||
1993 | off_t | |
9a0910c3 | 1994 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 1995 | { |
a3ad94ed ILT |
1996 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
1997 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
1998 | ++p) |
1999 | { | |
27bc2bce ILT |
2000 | // The symtab section is handled in create_symtab_sections. |
2001 | if (*p == this->symtab_section_) | |
61ba1cf9 | 2002 | continue; |
27bc2bce | 2003 | |
a9a60db6 ILT |
2004 | // If we've already set the data size, don't set it again. |
2005 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) | |
2006 | continue; | |
2007 | ||
96803768 ILT |
2008 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2009 | && (*p)->requires_postprocessing()) | |
17a1d0a9 ILT |
2010 | { |
2011 | (*p)->create_postprocessing_buffer(); | |
2012 | this->any_postprocessing_sections_ = true; | |
2013 | } | |
96803768 | 2014 | |
9a0910c3 ILT |
2015 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
2016 | && (*p)->after_input_sections()) | |
2017 | continue; | |
17a1d0a9 | 2018 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
2019 | && (!(*p)->after_input_sections() |
2020 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
2021 | continue; | |
17a1d0a9 | 2022 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
2023 | && (!(*p)->after_input_sections() |
2024 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
2025 | continue; | |
27bc2bce | 2026 | |
ead1e424 | 2027 | off = align_address(off, (*p)->addralign()); |
27bc2bce ILT |
2028 | (*p)->set_file_offset(off); |
2029 | (*p)->finalize_data_size(); | |
75f65a3e | 2030 | off += (*p)->data_size(); |
96803768 ILT |
2031 | |
2032 | // At this point the name must be set. | |
17a1d0a9 | 2033 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
96803768 | 2034 | this->namepool_.add((*p)->name(), false, NULL); |
75f65a3e ILT |
2035 | } |
2036 | return off; | |
2037 | } | |
2038 | ||
86887060 ILT |
2039 | // Set the section indexes of all the sections not associated with a |
2040 | // segment. | |
2041 | ||
2042 | unsigned int | |
2043 | Layout::set_section_indexes(unsigned int shndx) | |
2044 | { | |
2045 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
2046 | p != this->unattached_section_list_.end(); | |
2047 | ++p) | |
2048 | { | |
d491d34e ILT |
2049 | if (!(*p)->has_out_shndx()) |
2050 | { | |
2051 | (*p)->set_out_shndx(shndx); | |
2052 | ++shndx; | |
2053 | } | |
86887060 ILT |
2054 | } |
2055 | return shndx; | |
2056 | } | |
2057 | ||
a445fddf ILT |
2058 | // Set the section addresses according to the linker script. This is |
2059 | // only called when we see a SECTIONS clause. This returns the | |
2060 | // program segment which should hold the file header and segment | |
2061 | // headers, if any. It will return NULL if they should not be in a | |
2062 | // segment. | |
2063 | ||
2064 | Output_segment* | |
2065 | Layout::set_section_addresses_from_script(Symbol_table* symtab) | |
2066 | { | |
2067 | Script_sections* ss = this->script_options_->script_sections(); | |
2068 | gold_assert(ss->saw_sections_clause()); | |
2069 | ||
2070 | // Place each orphaned output section in the script. | |
2071 | for (Section_list::iterator p = this->section_list_.begin(); | |
2072 | p != this->section_list_.end(); | |
2073 | ++p) | |
2074 | { | |
2075 | if (!(*p)->found_in_sections_clause()) | |
2076 | ss->place_orphan(*p); | |
2077 | } | |
2078 | ||
2079 | return this->script_options_->set_section_addresses(symtab, this); | |
2080 | } | |
2081 | ||
7bf1f802 ILT |
2082 | // Count the local symbols in the regular symbol table and the dynamic |
2083 | // symbol table, and build the respective string pools. | |
2084 | ||
2085 | void | |
17a1d0a9 ILT |
2086 | Layout::count_local_symbols(const Task* task, |
2087 | const Input_objects* input_objects) | |
7bf1f802 | 2088 | { |
6d013333 ILT |
2089 | // First, figure out an upper bound on the number of symbols we'll |
2090 | // be inserting into each pool. This helps us create the pools with | |
2091 | // the right size, to avoid unnecessary hashtable resizing. | |
2092 | unsigned int symbol_count = 0; | |
2093 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2094 | p != input_objects->relobj_end(); | |
2095 | ++p) | |
2096 | symbol_count += (*p)->local_symbol_count(); | |
2097 | ||
2098 | // Go from "upper bound" to "estimate." We overcount for two | |
2099 | // reasons: we double-count symbols that occur in more than one | |
2100 | // object file, and we count symbols that are dropped from the | |
2101 | // output. Add it all together and assume we overcount by 100%. | |
2102 | symbol_count /= 2; | |
2103 | ||
2104 | // We assume all symbols will go into both the sympool and dynpool. | |
2105 | this->sympool_.reserve(symbol_count); | |
2106 | this->dynpool_.reserve(symbol_count); | |
2107 | ||
7bf1f802 ILT |
2108 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2109 | p != input_objects->relobj_end(); | |
2110 | ++p) | |
2111 | { | |
17a1d0a9 | 2112 | Task_lock_obj<Object> tlo(task, *p); |
7bf1f802 ILT |
2113 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
2114 | } | |
2115 | } | |
2116 | ||
b8e6aad9 ILT |
2117 | // Create the symbol table sections. Here we also set the final |
2118 | // values of the symbols. At this point all the loadable sections are | |
d491d34e | 2119 | // fully laid out. SHNUM is the number of sections so far. |
75f65a3e ILT |
2120 | |
2121 | void | |
9025d29d | 2122 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 2123 | Symbol_table* symtab, |
d491d34e | 2124 | unsigned int shnum, |
16649710 | 2125 | off_t* poff) |
75f65a3e | 2126 | { |
61ba1cf9 ILT |
2127 | int symsize; |
2128 | unsigned int align; | |
8851ecca | 2129 | if (parameters->target().get_size() == 32) |
61ba1cf9 ILT |
2130 | { |
2131 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
2132 | align = 4; | |
2133 | } | |
8851ecca | 2134 | else if (parameters->target().get_size() == 64) |
61ba1cf9 ILT |
2135 | { |
2136 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
2137 | align = 8; | |
2138 | } | |
2139 | else | |
a3ad94ed | 2140 | gold_unreachable(); |
61ba1cf9 ILT |
2141 | |
2142 | off_t off = *poff; | |
ead1e424 | 2143 | off = align_address(off, align); |
61ba1cf9 ILT |
2144 | off_t startoff = off; |
2145 | ||
2146 | // Save space for the dummy symbol at the start of the section. We | |
2147 | // never bother to write this out--it will just be left as zero. | |
2148 | off += symsize; | |
c06b7b0b | 2149 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 2150 | |
a3ad94ed ILT |
2151 | // Add STT_SECTION symbols for each Output section which needs one. |
2152 | for (Section_list::iterator p = this->section_list_.begin(); | |
2153 | p != this->section_list_.end(); | |
2154 | ++p) | |
2155 | { | |
2156 | if (!(*p)->needs_symtab_index()) | |
2157 | (*p)->set_symtab_index(-1U); | |
2158 | else | |
2159 | { | |
2160 | (*p)->set_symtab_index(local_symbol_index); | |
2161 | ++local_symbol_index; | |
2162 | off += symsize; | |
2163 | } | |
2164 | } | |
2165 | ||
f6ce93d6 ILT |
2166 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2167 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
2168 | ++p) |
2169 | { | |
c06b7b0b | 2170 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
7bf1f802 | 2171 | off); |
c06b7b0b ILT |
2172 | off += (index - local_symbol_index) * symsize; |
2173 | local_symbol_index = index; | |
75f65a3e ILT |
2174 | } |
2175 | ||
c06b7b0b | 2176 | unsigned int local_symcount = local_symbol_index; |
a3ad94ed | 2177 | gold_assert(local_symcount * symsize == off - startoff); |
61ba1cf9 | 2178 | |
16649710 ILT |
2179 | off_t dynoff; |
2180 | size_t dyn_global_index; | |
2181 | size_t dyncount; | |
2182 | if (this->dynsym_section_ == NULL) | |
2183 | { | |
2184 | dynoff = 0; | |
2185 | dyn_global_index = 0; | |
2186 | dyncount = 0; | |
2187 | } | |
2188 | else | |
2189 | { | |
2190 | dyn_global_index = this->dynsym_section_->info(); | |
2191 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); | |
2192 | dynoff = this->dynsym_section_->offset() + locsize; | |
2193 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 2194 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
2195 | == this->dynsym_section_->data_size() - locsize); |
2196 | } | |
2197 | ||
55a93433 ILT |
2198 | off = symtab->finalize(off, dynoff, dyn_global_index, dyncount, |
2199 | &this->sympool_, &local_symcount); | |
75f65a3e | 2200 | |
8851ecca | 2201 | if (!parameters->options().strip_all()) |
9e2dcb77 ILT |
2202 | { |
2203 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 2204 | |
cfd73a4e | 2205 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
2206 | Output_section* osymtab = this->make_output_section(symtab_name, |
2207 | elfcpp::SHT_SYMTAB, | |
2208 | 0); | |
2209 | this->symtab_section_ = osymtab; | |
a3ad94ed | 2210 | |
27bc2bce | 2211 | Output_section_data* pos = new Output_data_fixed_space(off - startoff, |
7d9e3d98 ILT |
2212 | align, |
2213 | "** symtab"); | |
9e2dcb77 | 2214 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 2215 | |
d491d34e ILT |
2216 | // We generate a .symtab_shndx section if we have more than |
2217 | // SHN_LORESERVE sections. Technically it is possible that we | |
2218 | // don't need one, because it is possible that there are no | |
2219 | // symbols in any of sections with indexes larger than | |
2220 | // SHN_LORESERVE. That is probably unusual, though, and it is | |
2221 | // easier to always create one than to compute section indexes | |
2222 | // twice (once here, once when writing out the symbols). | |
2223 | if (shnum >= elfcpp::SHN_LORESERVE) | |
2224 | { | |
2225 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", | |
2226 | false, NULL); | |
2227 | Output_section* osymtab_xindex = | |
2228 | this->make_output_section(symtab_xindex_name, | |
2229 | elfcpp::SHT_SYMTAB_SHNDX, 0); | |
2230 | ||
2231 | size_t symcount = (off - startoff) / symsize; | |
2232 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); | |
2233 | ||
2234 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); | |
2235 | ||
2236 | osymtab_xindex->set_link_section(osymtab); | |
2237 | osymtab_xindex->set_addralign(4); | |
2238 | osymtab_xindex->set_entsize(4); | |
2239 | ||
2240 | osymtab_xindex->set_after_input_sections(); | |
2241 | ||
2242 | // This tells the driver code to wait until the symbol table | |
2243 | // has written out before writing out the postprocessing | |
2244 | // sections, including the .symtab_shndx section. | |
2245 | this->any_postprocessing_sections_ = true; | |
2246 | } | |
2247 | ||
cfd73a4e | 2248 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
2249 | Output_section* ostrtab = this->make_output_section(strtab_name, |
2250 | elfcpp::SHT_STRTAB, | |
2251 | 0); | |
a3ad94ed | 2252 | |
9e2dcb77 ILT |
2253 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
2254 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 2255 | |
27bc2bce ILT |
2256 | osymtab->set_file_offset(startoff); |
2257 | osymtab->finalize_data_size(); | |
9e2dcb77 ILT |
2258 | osymtab->set_link_section(ostrtab); |
2259 | osymtab->set_info(local_symcount); | |
2260 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 2261 | |
9e2dcb77 ILT |
2262 | *poff = off; |
2263 | } | |
75f65a3e ILT |
2264 | } |
2265 | ||
2266 | // Create the .shstrtab section, which holds the names of the | |
2267 | // sections. At the time this is called, we have created all the | |
2268 | // output sections except .shstrtab itself. | |
2269 | ||
2270 | Output_section* | |
2271 | Layout::create_shstrtab() | |
2272 | { | |
2273 | // FIXME: We don't need to create a .shstrtab section if we are | |
2274 | // stripping everything. | |
2275 | ||
cfd73a4e | 2276 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 2277 | |
a3ad94ed | 2278 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0); |
75f65a3e | 2279 | |
27bc2bce ILT |
2280 | // We can't write out this section until we've set all the section |
2281 | // names, and we don't set the names of compressed output sections | |
2282 | // until relocations are complete. | |
2283 | os->set_after_input_sections(); | |
2284 | ||
a3ad94ed ILT |
2285 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
2286 | os->add_output_section_data(posd); | |
75f65a3e ILT |
2287 | |
2288 | return os; | |
2289 | } | |
2290 | ||
2291 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
2292 | // offset. | |
2293 | ||
27bc2bce | 2294 | void |
d491d34e | 2295 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
75f65a3e ILT |
2296 | { |
2297 | Output_section_headers* oshdrs; | |
9025d29d | 2298 | oshdrs = new Output_section_headers(this, |
16649710 | 2299 | &this->segment_list_, |
6a74a719 | 2300 | &this->section_list_, |
16649710 | 2301 | &this->unattached_section_list_, |
d491d34e ILT |
2302 | &this->namepool_, |
2303 | shstrtab_section); | |
ead1e424 | 2304 | off_t off = align_address(*poff, oshdrs->addralign()); |
27bc2bce | 2305 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 ILT |
2306 | off += oshdrs->data_size(); |
2307 | *poff = off; | |
27bc2bce | 2308 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
2309 | } |
2310 | ||
d491d34e ILT |
2311 | // Count the allocated sections. |
2312 | ||
2313 | size_t | |
2314 | Layout::allocated_output_section_count() const | |
2315 | { | |
2316 | size_t section_count = 0; | |
2317 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
2318 | p != this->segment_list_.end(); | |
2319 | ++p) | |
2320 | section_count += (*p)->output_section_count(); | |
2321 | return section_count; | |
2322 | } | |
2323 | ||
dbe717ef ILT |
2324 | // Create the dynamic symbol table. |
2325 | ||
2326 | void | |
7bf1f802 | 2327 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
9b07f471 | 2328 | Symbol_table* symtab, |
14b31740 ILT |
2329 | Output_section **pdynstr, |
2330 | unsigned int* plocal_dynamic_count, | |
2331 | std::vector<Symbol*>* pdynamic_symbols, | |
2332 | Versions* pversions) | |
dbe717ef | 2333 | { |
a3ad94ed ILT |
2334 | // Count all the symbols in the dynamic symbol table, and set the |
2335 | // dynamic symbol indexes. | |
dbe717ef | 2336 | |
a3ad94ed ILT |
2337 | // Skip symbol 0, which is always all zeroes. |
2338 | unsigned int index = 1; | |
dbe717ef | 2339 | |
a3ad94ed ILT |
2340 | // Add STT_SECTION symbols for each Output section which needs one. |
2341 | for (Section_list::iterator p = this->section_list_.begin(); | |
2342 | p != this->section_list_.end(); | |
2343 | ++p) | |
2344 | { | |
2345 | if (!(*p)->needs_dynsym_index()) | |
2346 | (*p)->set_dynsym_index(-1U); | |
2347 | else | |
2348 | { | |
2349 | (*p)->set_dynsym_index(index); | |
2350 | ++index; | |
2351 | } | |
2352 | } | |
2353 | ||
7bf1f802 ILT |
2354 | // Count the local symbols that need to go in the dynamic symbol table, |
2355 | // and set the dynamic symbol indexes. | |
2356 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2357 | p != input_objects->relobj_end(); | |
2358 | ++p) | |
2359 | { | |
2360 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
2361 | index = new_index; | |
2362 | } | |
a3ad94ed ILT |
2363 | |
2364 | unsigned int local_symcount = index; | |
14b31740 | 2365 | *plocal_dynamic_count = local_symcount; |
a3ad94ed | 2366 | |
9b07f471 | 2367 | index = symtab->set_dynsym_indexes(index, pdynamic_symbols, |
35cdfc9a | 2368 | &this->dynpool_, pversions); |
a3ad94ed ILT |
2369 | |
2370 | int symsize; | |
2371 | unsigned int align; | |
8851ecca | 2372 | const int size = parameters->target().get_size(); |
a3ad94ed ILT |
2373 | if (size == 32) |
2374 | { | |
2375 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
2376 | align = 4; | |
2377 | } | |
2378 | else if (size == 64) | |
2379 | { | |
2380 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
2381 | align = 8; | |
2382 | } | |
2383 | else | |
2384 | gold_unreachable(); | |
2385 | ||
14b31740 ILT |
2386 | // Create the dynamic symbol table section. |
2387 | ||
3802b2dd ILT |
2388 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
2389 | elfcpp::SHT_DYNSYM, | |
2390 | elfcpp::SHF_ALLOC, | |
2391 | false); | |
a3ad94ed | 2392 | |
27bc2bce | 2393 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, |
7d9e3d98 ILT |
2394 | align, |
2395 | "** dynsym"); | |
a3ad94ed ILT |
2396 | dynsym->add_output_section_data(odata); |
2397 | ||
2398 | dynsym->set_info(local_symcount); | |
2399 | dynsym->set_entsize(symsize); | |
2400 | dynsym->set_addralign(align); | |
2401 | ||
2402 | this->dynsym_section_ = dynsym; | |
2403 | ||
16649710 | 2404 | Output_data_dynamic* const odyn = this->dynamic_data_; |
a3ad94ed ILT |
2405 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); |
2406 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
2407 | ||
d491d34e ILT |
2408 | // If there are more than SHN_LORESERVE allocated sections, we |
2409 | // create a .dynsym_shndx section. It is possible that we don't | |
2410 | // need one, because it is possible that there are no dynamic | |
2411 | // symbols in any of the sections with indexes larger than | |
2412 | // SHN_LORESERVE. This is probably unusual, though, and at this | |
2413 | // time we don't know the actual section indexes so it is | |
2414 | // inconvenient to check. | |
2415 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) | |
2416 | { | |
2417 | Output_section* dynsym_xindex = | |
2418 | this->choose_output_section(NULL, ".dynsym_shndx", | |
2419 | elfcpp::SHT_SYMTAB_SHNDX, | |
2420 | elfcpp::SHF_ALLOC, | |
2421 | false); | |
2422 | ||
2423 | this->dynsym_xindex_ = new Output_symtab_xindex(index); | |
2424 | ||
2425 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); | |
2426 | ||
2427 | dynsym_xindex->set_link_section(dynsym); | |
2428 | dynsym_xindex->set_addralign(4); | |
2429 | dynsym_xindex->set_entsize(4); | |
2430 | ||
2431 | dynsym_xindex->set_after_input_sections(); | |
2432 | ||
2433 | // This tells the driver code to wait until the symbol table has | |
2434 | // written out before writing out the postprocessing sections, | |
2435 | // including the .dynsym_shndx section. | |
2436 | this->any_postprocessing_sections_ = true; | |
2437 | } | |
2438 | ||
14b31740 ILT |
2439 | // Create the dynamic string table section. |
2440 | ||
3802b2dd ILT |
2441 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
2442 | elfcpp::SHT_STRTAB, | |
2443 | elfcpp::SHF_ALLOC, | |
2444 | false); | |
a3ad94ed ILT |
2445 | |
2446 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
2447 | dynstr->add_output_section_data(strdata); | |
2448 | ||
16649710 ILT |
2449 | dynsym->set_link_section(dynstr); |
2450 | this->dynamic_section_->set_link_section(dynstr); | |
2451 | ||
a3ad94ed ILT |
2452 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); |
2453 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
2454 | ||
14b31740 ILT |
2455 | *pdynstr = dynstr; |
2456 | ||
2457 | // Create the hash tables. | |
2458 | ||
13670ee6 ILT |
2459 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
2460 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
2461 | { | |
2462 | unsigned char* phash; | |
2463 | unsigned int hashlen; | |
2464 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, | |
2465 | &phash, &hashlen); | |
2466 | ||
2467 | Output_section* hashsec = this->choose_output_section(NULL, ".hash", | |
2468 | elfcpp::SHT_HASH, | |
2469 | elfcpp::SHF_ALLOC, | |
2470 | false); | |
2471 | ||
2472 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
2473 | hashlen, | |
7d9e3d98 ILT |
2474 | align, |
2475 | "** hash"); | |
13670ee6 ILT |
2476 | hashsec->add_output_section_data(hashdata); |
2477 | ||
2478 | hashsec->set_link_section(dynsym); | |
2479 | hashsec->set_entsize(4); | |
a3ad94ed | 2480 | |
13670ee6 ILT |
2481 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); |
2482 | } | |
2483 | ||
2484 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 | |
2485 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
2486 | { | |
2487 | unsigned char* phash; | |
2488 | unsigned int hashlen; | |
2489 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, local_symcount, | |
2490 | &phash, &hashlen); | |
a3ad94ed | 2491 | |
13670ee6 ILT |
2492 | Output_section* hashsec = this->choose_output_section(NULL, ".gnu.hash", |
2493 | elfcpp::SHT_GNU_HASH, | |
2494 | elfcpp::SHF_ALLOC, | |
2495 | false); | |
a3ad94ed | 2496 | |
13670ee6 ILT |
2497 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
2498 | hashlen, | |
7d9e3d98 ILT |
2499 | align, |
2500 | "** hash"); | |
13670ee6 | 2501 | hashsec->add_output_section_data(hashdata); |
a3ad94ed | 2502 | |
13670ee6 ILT |
2503 | hashsec->set_link_section(dynsym); |
2504 | hashsec->set_entsize(4); | |
a3ad94ed | 2505 | |
13670ee6 ILT |
2506 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); |
2507 | } | |
dbe717ef ILT |
2508 | } |
2509 | ||
7bf1f802 ILT |
2510 | // Assign offsets to each local portion of the dynamic symbol table. |
2511 | ||
2512 | void | |
2513 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
2514 | { | |
2515 | Output_section* dynsym = this->dynsym_section_; | |
2516 | gold_assert(dynsym != NULL); | |
2517 | ||
2518 | off_t off = dynsym->offset(); | |
2519 | ||
2520 | // Skip the dummy symbol at the start of the section. | |
2521 | off += dynsym->entsize(); | |
2522 | ||
2523 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2524 | p != input_objects->relobj_end(); | |
2525 | ++p) | |
2526 | { | |
2527 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
2528 | off += count * dynsym->entsize(); | |
2529 | } | |
2530 | } | |
2531 | ||
14b31740 ILT |
2532 | // Create the version sections. |
2533 | ||
2534 | void | |
9025d29d | 2535 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 2536 | const Symbol_table* symtab, |
14b31740 ILT |
2537 | unsigned int local_symcount, |
2538 | const std::vector<Symbol*>& dynamic_symbols, | |
2539 | const Output_section* dynstr) | |
2540 | { | |
2541 | if (!versions->any_defs() && !versions->any_needs()) | |
2542 | return; | |
2543 | ||
8851ecca | 2544 | switch (parameters->size_and_endianness()) |
14b31740 | 2545 | { |
193a53d9 | 2546 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2547 | case Parameters::TARGET_32_LITTLE: |
7d1a9ebb ILT |
2548 | this->sized_create_version_sections<32, false>(versions, symtab, |
2549 | local_symcount, | |
2550 | dynamic_symbols, dynstr); | |
8851ecca | 2551 | break; |
193a53d9 | 2552 | #endif |
8851ecca ILT |
2553 | #ifdef HAVE_TARGET_32_BIG |
2554 | case Parameters::TARGET_32_BIG: | |
7d1a9ebb ILT |
2555 | this->sized_create_version_sections<32, true>(versions, symtab, |
2556 | local_symcount, | |
2557 | dynamic_symbols, dynstr); | |
8851ecca | 2558 | break; |
193a53d9 | 2559 | #endif |
193a53d9 | 2560 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2561 | case Parameters::TARGET_64_LITTLE: |
7d1a9ebb ILT |
2562 | this->sized_create_version_sections<64, false>(versions, symtab, |
2563 | local_symcount, | |
2564 | dynamic_symbols, dynstr); | |
8851ecca | 2565 | break; |
193a53d9 | 2566 | #endif |
8851ecca ILT |
2567 | #ifdef HAVE_TARGET_64_BIG |
2568 | case Parameters::TARGET_64_BIG: | |
7d1a9ebb ILT |
2569 | this->sized_create_version_sections<64, true>(versions, symtab, |
2570 | local_symcount, | |
2571 | dynamic_symbols, dynstr); | |
8851ecca ILT |
2572 | break; |
2573 | #endif | |
2574 | default: | |
2575 | gold_unreachable(); | |
14b31740 | 2576 | } |
14b31740 ILT |
2577 | } |
2578 | ||
2579 | // Create the version sections, sized version. | |
2580 | ||
2581 | template<int size, bool big_endian> | |
2582 | void | |
2583 | Layout::sized_create_version_sections( | |
2584 | const Versions* versions, | |
46fe1623 | 2585 | const Symbol_table* symtab, |
14b31740 ILT |
2586 | unsigned int local_symcount, |
2587 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 2588 | const Output_section* dynstr) |
14b31740 | 2589 | { |
3802b2dd ILT |
2590 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
2591 | elfcpp::SHT_GNU_versym, | |
2592 | elfcpp::SHF_ALLOC, | |
2593 | false); | |
14b31740 ILT |
2594 | |
2595 | unsigned char* vbuf; | |
2596 | unsigned int vsize; | |
7d1a9ebb ILT |
2597 | versions->symbol_section_contents<size, big_endian>(symtab, &this->dynpool_, |
2598 | local_symcount, | |
2599 | dynamic_symbols, | |
2600 | &vbuf, &vsize); | |
14b31740 | 2601 | |
7d9e3d98 ILT |
2602 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, |
2603 | "** versions"); | |
14b31740 ILT |
2604 | |
2605 | vsec->add_output_section_data(vdata); | |
2606 | vsec->set_entsize(2); | |
2607 | vsec->set_link_section(this->dynsym_section_); | |
2608 | ||
2609 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
2610 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
2611 | ||
2612 | if (versions->any_defs()) | |
2613 | { | |
3802b2dd ILT |
2614 | Output_section* vdsec; |
2615 | vdsec= this->choose_output_section(NULL, ".gnu.version_d", | |
2616 | elfcpp::SHT_GNU_verdef, | |
2617 | elfcpp::SHF_ALLOC, | |
2618 | false); | |
14b31740 ILT |
2619 | |
2620 | unsigned char* vdbuf; | |
2621 | unsigned int vdsize; | |
2622 | unsigned int vdentries; | |
7d1a9ebb ILT |
2623 | versions->def_section_contents<size, big_endian>(&this->dynpool_, &vdbuf, |
2624 | &vdsize, &vdentries); | |
14b31740 | 2625 | |
7d9e3d98 ILT |
2626 | Output_section_data* vddata = |
2627 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); | |
14b31740 ILT |
2628 | |
2629 | vdsec->add_output_section_data(vddata); | |
2630 | vdsec->set_link_section(dynstr); | |
2631 | vdsec->set_info(vdentries); | |
2632 | ||
2633 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
2634 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
2635 | } | |
2636 | ||
2637 | if (versions->any_needs()) | |
2638 | { | |
14b31740 | 2639 | Output_section* vnsec; |
3802b2dd ILT |
2640 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
2641 | elfcpp::SHT_GNU_verneed, | |
2642 | elfcpp::SHF_ALLOC, | |
2643 | false); | |
14b31740 ILT |
2644 | |
2645 | unsigned char* vnbuf; | |
2646 | unsigned int vnsize; | |
2647 | unsigned int vnentries; | |
7d1a9ebb ILT |
2648 | versions->need_section_contents<size, big_endian>(&this->dynpool_, |
2649 | &vnbuf, &vnsize, | |
2650 | &vnentries); | |
14b31740 | 2651 | |
7d9e3d98 ILT |
2652 | Output_section_data* vndata = |
2653 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); | |
14b31740 ILT |
2654 | |
2655 | vnsec->add_output_section_data(vndata); | |
2656 | vnsec->set_link_section(dynstr); | |
2657 | vnsec->set_info(vnentries); | |
2658 | ||
2659 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
2660 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
2661 | } | |
2662 | } | |
2663 | ||
dbe717ef ILT |
2664 | // Create the .interp section and PT_INTERP segment. |
2665 | ||
2666 | void | |
2667 | Layout::create_interp(const Target* target) | |
2668 | { | |
e55bde5e | 2669 | const char* interp = parameters->options().dynamic_linker(); |
dbe717ef ILT |
2670 | if (interp == NULL) |
2671 | { | |
2672 | interp = target->dynamic_linker(); | |
a3ad94ed | 2673 | gold_assert(interp != NULL); |
dbe717ef ILT |
2674 | } |
2675 | ||
2676 | size_t len = strlen(interp) + 1; | |
2677 | ||
2678 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
2679 | ||
3802b2dd ILT |
2680 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
2681 | elfcpp::SHT_PROGBITS, | |
2682 | elfcpp::SHF_ALLOC, | |
2683 | false); | |
dbe717ef ILT |
2684 | osec->add_output_section_data(odata); |
2685 | ||
1c4f3631 ILT |
2686 | if (!this->script_options_->saw_phdrs_clause()) |
2687 | { | |
2688 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_INTERP, | |
2689 | elfcpp::PF_R); | |
01676dcd | 2690 | oseg->add_output_section(osec, elfcpp::PF_R); |
1c4f3631 | 2691 | } |
dbe717ef ILT |
2692 | } |
2693 | ||
a3ad94ed ILT |
2694 | // Finish the .dynamic section and PT_DYNAMIC segment. |
2695 | ||
2696 | void | |
2697 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 2698 | const Symbol_table* symtab) |
a3ad94ed | 2699 | { |
1c4f3631 ILT |
2700 | if (!this->script_options_->saw_phdrs_clause()) |
2701 | { | |
2702 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, | |
2703 | (elfcpp::PF_R | |
2704 | | elfcpp::PF_W)); | |
01676dcd ILT |
2705 | oseg->add_output_section(this->dynamic_section_, |
2706 | elfcpp::PF_R | elfcpp::PF_W); | |
1c4f3631 | 2707 | } |
a3ad94ed | 2708 | |
16649710 ILT |
2709 | Output_data_dynamic* const odyn = this->dynamic_data_; |
2710 | ||
a3ad94ed ILT |
2711 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
2712 | p != input_objects->dynobj_end(); | |
2713 | ++p) | |
2714 | { | |
2715 | // FIXME: Handle --as-needed. | |
2716 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); | |
2717 | } | |
2718 | ||
8851ecca | 2719 | if (parameters->options().shared()) |
fced7afd | 2720 | { |
e55bde5e | 2721 | const char* soname = parameters->options().soname(); |
fced7afd ILT |
2722 | if (soname != NULL) |
2723 | odyn->add_string(elfcpp::DT_SONAME, soname); | |
2724 | } | |
2725 | ||
a3ad94ed ILT |
2726 | // FIXME: Support --init and --fini. |
2727 | Symbol* sym = symtab->lookup("_init"); | |
14b31740 | 2728 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
2729 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
2730 | ||
2731 | sym = symtab->lookup("_fini"); | |
14b31740 | 2732 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
2733 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
2734 | ||
2735 | // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY. | |
41f542e7 ILT |
2736 | |
2737 | // Add a DT_RPATH entry if needed. | |
e55bde5e | 2738 | const General_options::Dir_list& rpath(parameters->options().rpath()); |
41f542e7 ILT |
2739 | if (!rpath.empty()) |
2740 | { | |
2741 | std::string rpath_val; | |
2742 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
2743 | p != rpath.end(); | |
2744 | ++p) | |
2745 | { | |
2746 | if (rpath_val.empty()) | |
ad2d6943 | 2747 | rpath_val = p->name(); |
41f542e7 ILT |
2748 | else |
2749 | { | |
2750 | // Eliminate duplicates. | |
2751 | General_options::Dir_list::const_iterator q; | |
2752 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 2753 | if (q->name() == p->name()) |
41f542e7 ILT |
2754 | break; |
2755 | if (q == p) | |
2756 | { | |
2757 | rpath_val += ':'; | |
ad2d6943 | 2758 | rpath_val += p->name(); |
41f542e7 ILT |
2759 | } |
2760 | } | |
2761 | } | |
2762 | ||
2763 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
7c414435 DM |
2764 | if (parameters->options().enable_new_dtags()) |
2765 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); | |
41f542e7 | 2766 | } |
4f4c5f80 ILT |
2767 | |
2768 | // Look for text segments that have dynamic relocations. | |
2769 | bool have_textrel = false; | |
4e8fe71f | 2770 | if (!this->script_options_->saw_sections_clause()) |
4f4c5f80 | 2771 | { |
4e8fe71f ILT |
2772 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
2773 | p != this->segment_list_.end(); | |
2774 | ++p) | |
2775 | { | |
2776 | if (((*p)->flags() & elfcpp::PF_W) == 0 | |
2777 | && (*p)->dynamic_reloc_count() > 0) | |
2778 | { | |
2779 | have_textrel = true; | |
2780 | break; | |
2781 | } | |
2782 | } | |
2783 | } | |
2784 | else | |
2785 | { | |
2786 | // We don't know the section -> segment mapping, so we are | |
2787 | // conservative and just look for readonly sections with | |
2788 | // relocations. If those sections wind up in writable segments, | |
2789 | // then we have created an unnecessary DT_TEXTREL entry. | |
2790 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
2791 | p != this->section_list_.end(); | |
2792 | ++p) | |
2793 | { | |
2794 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 | |
2795 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 | |
2796 | && ((*p)->dynamic_reloc_count() > 0)) | |
2797 | { | |
2798 | have_textrel = true; | |
2799 | break; | |
2800 | } | |
2801 | } | |
4f4c5f80 ILT |
2802 | } |
2803 | ||
2804 | // Add a DT_FLAGS entry. We add it even if no flags are set so that | |
2805 | // post-link tools can easily modify these flags if desired. | |
2806 | unsigned int flags = 0; | |
2807 | if (have_textrel) | |
6a41d30b ILT |
2808 | { |
2809 | // Add a DT_TEXTREL for compatibility with older loaders. | |
2810 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
2811 | flags |= elfcpp::DF_TEXTREL; | |
2812 | } | |
8851ecca | 2813 | if (parameters->options().shared() && this->has_static_tls()) |
535890bb | 2814 | flags |= elfcpp::DF_STATIC_TLS; |
7be8330a CD |
2815 | if (parameters->options().origin()) |
2816 | flags |= elfcpp::DF_ORIGIN; | |
4f4c5f80 | 2817 | odyn->add_constant(elfcpp::DT_FLAGS, flags); |
7c414435 DM |
2818 | |
2819 | flags = 0; | |
2820 | if (parameters->options().initfirst()) | |
2821 | flags |= elfcpp::DF_1_INITFIRST; | |
2822 | if (parameters->options().interpose()) | |
2823 | flags |= elfcpp::DF_1_INTERPOSE; | |
2824 | if (parameters->options().loadfltr()) | |
2825 | flags |= elfcpp::DF_1_LOADFLTR; | |
2826 | if (parameters->options().nodefaultlib()) | |
2827 | flags |= elfcpp::DF_1_NODEFLIB; | |
2828 | if (parameters->options().nodelete()) | |
2829 | flags |= elfcpp::DF_1_NODELETE; | |
2830 | if (parameters->options().nodlopen()) | |
2831 | flags |= elfcpp::DF_1_NOOPEN; | |
2832 | if (parameters->options().nodump()) | |
2833 | flags |= elfcpp::DF_1_NODUMP; | |
2834 | if (!parameters->options().shared()) | |
2835 | flags &= ~(elfcpp::DF_1_INITFIRST | |
2836 | | elfcpp::DF_1_NODELETE | |
2837 | | elfcpp::DF_1_NOOPEN); | |
7be8330a CD |
2838 | if (parameters->options().origin()) |
2839 | flags |= elfcpp::DF_1_ORIGIN; | |
7c414435 DM |
2840 | if (flags) |
2841 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); | |
a3ad94ed ILT |
2842 | } |
2843 | ||
a2fb1b05 ILT |
2844 | // The mapping of .gnu.linkonce section names to real section names. |
2845 | ||
ead1e424 | 2846 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
a2fb1b05 ILT |
2847 | const Layout::Linkonce_mapping Layout::linkonce_mapping[] = |
2848 | { | |
9f1d377b ILT |
2849 | MAPPING_INIT("d.rel.ro.local", ".data.rel.ro.local"), // Before "d.rel.ro". |
2850 | MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Before "d". | |
a2fb1b05 ILT |
2851 | MAPPING_INIT("t", ".text"), |
2852 | MAPPING_INIT("r", ".rodata"), | |
2853 | MAPPING_INIT("d", ".data"), | |
2854 | MAPPING_INIT("b", ".bss"), | |
2855 | MAPPING_INIT("s", ".sdata"), | |
2856 | MAPPING_INIT("sb", ".sbss"), | |
2857 | MAPPING_INIT("s2", ".sdata2"), | |
2858 | MAPPING_INIT("sb2", ".sbss2"), | |
2859 | MAPPING_INIT("wi", ".debug_info"), | |
2860 | MAPPING_INIT("td", ".tdata"), | |
2861 | MAPPING_INIT("tb", ".tbss"), | |
2862 | MAPPING_INIT("lr", ".lrodata"), | |
2863 | MAPPING_INIT("l", ".ldata"), | |
2864 | MAPPING_INIT("lb", ".lbss"), | |
2865 | }; | |
2866 | #undef MAPPING_INIT | |
2867 | ||
2868 | const int Layout::linkonce_mapping_count = | |
2869 | sizeof(Layout::linkonce_mapping) / sizeof(Layout::linkonce_mapping[0]); | |
2870 | ||
2871 | // Return the name of the output section to use for a .gnu.linkonce | |
2872 | // section. This is based on the default ELF linker script of the old | |
2873 | // GNU linker. For example, we map a name like ".gnu.linkonce.t.foo" | |
ead1e424 ILT |
2874 | // to ".text". Set *PLEN to the length of the name. *PLEN is |
2875 | // initialized to the length of NAME. | |
a2fb1b05 ILT |
2876 | |
2877 | const char* | |
ead1e424 | 2878 | Layout::linkonce_output_name(const char* name, size_t *plen) |
a2fb1b05 ILT |
2879 | { |
2880 | const char* s = name + sizeof(".gnu.linkonce") - 1; | |
2881 | if (*s != '.') | |
2882 | return name; | |
2883 | ++s; | |
2884 | const Linkonce_mapping* plm = linkonce_mapping; | |
2885 | for (int i = 0; i < linkonce_mapping_count; ++i, ++plm) | |
2886 | { | |
2887 | if (strncmp(s, plm->from, plm->fromlen) == 0 && s[plm->fromlen] == '.') | |
ead1e424 ILT |
2888 | { |
2889 | *plen = plm->tolen; | |
2890 | return plm->to; | |
2891 | } | |
a2fb1b05 ILT |
2892 | } |
2893 | return name; | |
2894 | } | |
2895 | ||
ead1e424 ILT |
2896 | // Choose the output section name to use given an input section name. |
2897 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
2898 | // length of NAME. | |
2899 | ||
2900 | const char* | |
2901 | Layout::output_section_name(const char* name, size_t* plen) | |
2902 | { | |
2903 | if (Layout::is_linkonce(name)) | |
2904 | { | |
2905 | // .gnu.linkonce sections are laid out as though they were named | |
2906 | // for the sections are placed into. | |
2907 | return Layout::linkonce_output_name(name, plen); | |
2908 | } | |
2909 | ||
af4a8a83 ILT |
2910 | // gcc 4.3 generates the following sorts of section names when it |
2911 | // needs a section name specific to a function: | |
2912 | // .text.FN | |
2913 | // .rodata.FN | |
2914 | // .sdata2.FN | |
2915 | // .data.FN | |
2916 | // .data.rel.FN | |
2917 | // .data.rel.local.FN | |
2918 | // .data.rel.ro.FN | |
2919 | // .data.rel.ro.local.FN | |
2920 | // .sdata.FN | |
2921 | // .bss.FN | |
2922 | // .sbss.FN | |
2923 | // .tdata.FN | |
2924 | // .tbss.FN | |
2925 | ||
2926 | // The GNU linker maps all of those to the part before the .FN, | |
2927 | // except that .data.rel.local.FN is mapped to .data, and | |
2928 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
2929 | // beginning with .data.rel.ro.local are grouped together. | |
2930 | ||
2931 | // For an anonymous namespace, the string FN can contain a '.'. | |
2932 | ||
2933 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
2934 | // GNU linker maps to .rodata. | |
2935 | ||
2936 | // The .data.rel.ro sections enable a security feature triggered by | |
2937 | // the -z relro option. Section which need to be relocated at | |
2938 | // program startup time but which may be readonly after startup are | |
2939 | // grouped into .data.rel.ro. They are then put into a PT_GNU_RELRO | |
2940 | // segment. The dynamic linker will make that segment writable, | |
2941 | // perform relocations, and then make it read-only. FIXME: We do | |
2942 | // not yet implement this optimization. | |
2943 | ||
2944 | // It is hard to handle this in a principled way. | |
2945 | ||
2946 | // These are the rules we follow: | |
2947 | ||
2948 | // If the section name has no initial '.', or no dot other than an | |
2949 | // initial '.', we use the name unchanged (i.e., "mysection" and | |
2950 | // ".text" are unchanged). | |
2951 | ||
41105937 PP |
2952 | // If the name starts with '.note', we keep it unchanged (e.g. to |
2953 | // avoid truncating '.note.ABI-tag' to '.note'). | |
2954 | ||
9f1d377b ILT |
2955 | // If the name starts with ".data.rel.ro.local" we use |
2956 | // ".data.rel.ro.local". | |
2957 | ||
af4a8a83 ILT |
2958 | // If the name starts with ".data.rel.ro" we use ".data.rel.ro". |
2959 | ||
2960 | // Otherwise, we drop the second '.' and everything that comes after | |
2961 | // it (i.e., ".text.XXX" becomes ".text"). | |
ead1e424 ILT |
2962 | |
2963 | const char* s = name; | |
af4a8a83 ILT |
2964 | if (*s != '.') |
2965 | return name; | |
2966 | ++s; | |
ead1e424 ILT |
2967 | const char* sdot = strchr(s, '.'); |
2968 | if (sdot == NULL) | |
2969 | return name; | |
41105937 PP |
2970 | if (strncmp(name, ".note.", 6) == 0) |
2971 | return name; | |
ead1e424 | 2972 | |
9f1d377b ILT |
2973 | const char* const data_rel_ro_local = ".data.rel.ro.local"; |
2974 | if (strncmp(name, data_rel_ro_local, strlen(data_rel_ro_local)) == 0) | |
2975 | { | |
2976 | *plen = strlen(data_rel_ro_local); | |
2977 | return data_rel_ro_local; | |
2978 | } | |
2979 | ||
af4a8a83 ILT |
2980 | const char* const data_rel_ro = ".data.rel.ro"; |
2981 | if (strncmp(name, data_rel_ro, strlen(data_rel_ro)) == 0) | |
ead1e424 | 2982 | { |
af4a8a83 ILT |
2983 | *plen = strlen(data_rel_ro); |
2984 | return data_rel_ro; | |
ead1e424 ILT |
2985 | } |
2986 | ||
ead1e424 ILT |
2987 | *plen = sdot - name; |
2988 | return name; | |
2989 | } | |
2990 | ||
8a4c0b0d ILT |
2991 | // Check if a comdat group or .gnu.linkonce section with the given |
2992 | // NAME is selected for the link. If there is already a section, | |
2993 | // *KEPT_SECTION is set to point to the signature and the function | |
2994 | // returns false. Otherwise, the CANDIDATE signature is recorded for | |
2995 | // this NAME in the layout object, *KEPT_SECTION is set to the | |
2996 | // internal copy and the function return false. In some cases, with | |
2997 | // CANDIDATE->GROUP_ being false, KEPT_SECTION can point back to | |
2998 | // CANDIDATE. | |
a2fb1b05 ILT |
2999 | |
3000 | bool | |
e55bde5e | 3001 | Layout::find_or_add_kept_section(const std::string& name, |
8a4c0b0d ILT |
3002 | Kept_section* candidate, |
3003 | Kept_section** kept_section) | |
a2fb1b05 | 3004 | { |
e55bde5e ILT |
3005 | // It's normal to see a couple of entries here, for the x86 thunk |
3006 | // sections. If we see more than a few, we're linking a C++ | |
3007 | // program, and we resize to get more space to minimize rehashing. | |
3008 | if (this->signatures_.size() > 4 | |
3009 | && !this->resized_signatures_) | |
3010 | { | |
3011 | reserve_unordered_map(&this->signatures_, | |
3012 | this->number_of_input_files_ * 64); | |
3013 | this->resized_signatures_ = true; | |
3014 | } | |
3015 | ||
a2fb1b05 | 3016 | std::pair<Signatures::iterator, bool> ins( |
8a4c0b0d | 3017 | this->signatures_.insert(std::make_pair(name, *candidate))); |
a2fb1b05 | 3018 | |
8a4c0b0d ILT |
3019 | if (kept_section) |
3020 | *kept_section = &ins.first->second; | |
a2fb1b05 ILT |
3021 | if (ins.second) |
3022 | { | |
3023 | // This is the first time we've seen this signature. | |
3024 | return true; | |
3025 | } | |
3026 | ||
8a4c0b0d | 3027 | if (ins.first->second.is_group) |
a2fb1b05 ILT |
3028 | { |
3029 | // We've already seen a real section group with this signature. | |
2756a258 CC |
3030 | // If the kept group is from a plugin object, and we're in |
3031 | // the replacement phase, accept the new one as a replacement. | |
8a4c0b0d | 3032 | if (ins.first->second.object == NULL |
2756a258 CC |
3033 | && parameters->options().plugins()->in_replacement_phase()) |
3034 | { | |
8a4c0b0d | 3035 | ins.first->second = *candidate; |
2756a258 CC |
3036 | return true; |
3037 | } | |
a2fb1b05 ILT |
3038 | return false; |
3039 | } | |
8a4c0b0d | 3040 | else if (candidate->is_group) |
a2fb1b05 ILT |
3041 | { |
3042 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 3043 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 | 3044 | // a section group, and don't include this section group. |
8a4c0b0d | 3045 | ins.first->second.is_group = true; |
a2fb1b05 ILT |
3046 | return false; |
3047 | } | |
3048 | else | |
3049 | { | |
3050 | // We've already seen a linkonce section and this is a linkonce | |
3051 | // section. These don't block each other--this may be the same | |
3052 | // symbol name with different section types. | |
8a4c0b0d | 3053 | *kept_section = candidate; |
a2fb1b05 ILT |
3054 | return true; |
3055 | } | |
3056 | } | |
3057 | ||
e94cf127 CC |
3058 | // Find the given comdat signature, and return the object and section |
3059 | // index of the kept group. | |
3060 | Relobj* | |
3061 | Layout::find_kept_object(const std::string& signature, | |
3062 | unsigned int* pshndx) const | |
3063 | { | |
3064 | Signatures::const_iterator p = this->signatures_.find(signature); | |
3065 | if (p == this->signatures_.end()) | |
3066 | return NULL; | |
3067 | if (pshndx != NULL) | |
8a4c0b0d ILT |
3068 | *pshndx = p->second.shndx; |
3069 | return p->second.object; | |
e94cf127 CC |
3070 | } |
3071 | ||
a445fddf ILT |
3072 | // Store the allocated sections into the section list. |
3073 | ||
3074 | void | |
3075 | Layout::get_allocated_sections(Section_list* section_list) const | |
3076 | { | |
3077 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3078 | p != this->section_list_.end(); | |
3079 | ++p) | |
3080 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) | |
3081 | section_list->push_back(*p); | |
3082 | } | |
3083 | ||
3084 | // Create an output segment. | |
3085 | ||
3086 | Output_segment* | |
3087 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
3088 | { | |
8851ecca | 3089 | gold_assert(!parameters->options().relocatable()); |
a445fddf ILT |
3090 | Output_segment* oseg = new Output_segment(type, flags); |
3091 | this->segment_list_.push_back(oseg); | |
2d924fd9 ILT |
3092 | |
3093 | if (type == elfcpp::PT_TLS) | |
3094 | this->tls_segment_ = oseg; | |
3095 | else if (type == elfcpp::PT_GNU_RELRO) | |
3096 | this->relro_segment_ = oseg; | |
3097 | ||
a445fddf ILT |
3098 | return oseg; |
3099 | } | |
3100 | ||
730cdc88 ILT |
3101 | // Write out the Output_sections. Most won't have anything to write, |
3102 | // since most of the data will come from input sections which are | |
3103 | // handled elsewhere. But some Output_sections do have Output_data. | |
3104 | ||
3105 | void | |
3106 | Layout::write_output_sections(Output_file* of) const | |
3107 | { | |
3108 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3109 | p != this->section_list_.end(); | |
3110 | ++p) | |
3111 | { | |
3112 | if (!(*p)->after_input_sections()) | |
3113 | (*p)->write(of); | |
3114 | } | |
3115 | } | |
3116 | ||
61ba1cf9 ILT |
3117 | // Write out data not associated with a section or the symbol table. |
3118 | ||
3119 | void | |
9025d29d | 3120 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 3121 | { |
8851ecca | 3122 | if (!parameters->options().strip_all()) |
a3ad94ed | 3123 | { |
9e2dcb77 ILT |
3124 | const Output_section* symtab_section = this->symtab_section_; |
3125 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3126 | p != this->section_list_.end(); | |
3127 | ++p) | |
a3ad94ed | 3128 | { |
9e2dcb77 ILT |
3129 | if ((*p)->needs_symtab_index()) |
3130 | { | |
3131 | gold_assert(symtab_section != NULL); | |
3132 | unsigned int index = (*p)->symtab_index(); | |
3133 | gold_assert(index > 0 && index != -1U); | |
3134 | off_t off = (symtab_section->offset() | |
3135 | + index * symtab_section->entsize()); | |
d491d34e | 3136 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
9e2dcb77 | 3137 | } |
a3ad94ed ILT |
3138 | } |
3139 | } | |
3140 | ||
3141 | const Output_section* dynsym_section = this->dynsym_section_; | |
3142 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3143 | p != this->section_list_.end(); | |
3144 | ++p) | |
3145 | { | |
3146 | if ((*p)->needs_dynsym_index()) | |
3147 | { | |
3148 | gold_assert(dynsym_section != NULL); | |
3149 | unsigned int index = (*p)->dynsym_index(); | |
3150 | gold_assert(index > 0 && index != -1U); | |
3151 | off_t off = (dynsym_section->offset() | |
3152 | + index * dynsym_section->entsize()); | |
d491d34e | 3153 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
a3ad94ed ILT |
3154 | } |
3155 | } | |
3156 | ||
a3ad94ed | 3157 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
3158 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
3159 | p != this->special_output_list_.end(); | |
3160 | ++p) | |
3161 | (*p)->write(of); | |
3162 | } | |
3163 | ||
730cdc88 ILT |
3164 | // Write out the Output_sections which can only be written after the |
3165 | // input sections are complete. | |
3166 | ||
3167 | void | |
27bc2bce | 3168 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 3169 | { |
27bc2bce | 3170 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
3171 | // file size. Note we finalize the .shstrab last, to allow the |
3172 | // after_input_section sections to modify their section-names before | |
3173 | // writing. | |
17a1d0a9 | 3174 | if (this->any_postprocessing_sections_) |
27bc2bce | 3175 | { |
17a1d0a9 ILT |
3176 | off_t off = this->output_file_size_; |
3177 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); | |
8a4c0b0d | 3178 | |
17a1d0a9 ILT |
3179 | // Now that we've finalized the names, we can finalize the shstrab. |
3180 | off = | |
3181 | this->set_section_offsets(off, | |
3182 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
3183 | ||
3184 | if (off > this->output_file_size_) | |
3185 | { | |
3186 | of->resize(off); | |
3187 | this->output_file_size_ = off; | |
3188 | } | |
27bc2bce ILT |
3189 | } |
3190 | ||
730cdc88 ILT |
3191 | for (Section_list::const_iterator p = this->section_list_.begin(); |
3192 | p != this->section_list_.end(); | |
3193 | ++p) | |
3194 | { | |
3195 | if ((*p)->after_input_sections()) | |
3196 | (*p)->write(of); | |
3197 | } | |
27bc2bce | 3198 | |
27bc2bce | 3199 | this->section_headers_->write(of); |
730cdc88 ILT |
3200 | } |
3201 | ||
8ed814a9 ILT |
3202 | // If the build ID requires computing a checksum, do so here, and |
3203 | // write it out. We compute a checksum over the entire file because | |
3204 | // that is simplest. | |
3205 | ||
3206 | void | |
3207 | Layout::write_build_id(Output_file* of) const | |
3208 | { | |
3209 | if (this->build_id_note_ == NULL) | |
3210 | return; | |
3211 | ||
3212 | const unsigned char* iv = of->get_input_view(0, this->output_file_size_); | |
3213 | ||
3214 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), | |
3215 | this->build_id_note_->data_size()); | |
3216 | ||
3217 | const char* style = parameters->options().build_id(); | |
3218 | if (strcmp(style, "sha1") == 0) | |
3219 | { | |
3220 | sha1_ctx ctx; | |
3221 | sha1_init_ctx(&ctx); | |
3222 | sha1_process_bytes(iv, this->output_file_size_, &ctx); | |
3223 | sha1_finish_ctx(&ctx, ov); | |
3224 | } | |
3225 | else if (strcmp(style, "md5") == 0) | |
3226 | { | |
3227 | md5_ctx ctx; | |
3228 | md5_init_ctx(&ctx); | |
3229 | md5_process_bytes(iv, this->output_file_size_, &ctx); | |
3230 | md5_finish_ctx(&ctx, ov); | |
3231 | } | |
3232 | else | |
3233 | gold_unreachable(); | |
3234 | ||
3235 | of->write_output_view(this->build_id_note_->offset(), | |
3236 | this->build_id_note_->data_size(), | |
3237 | ov); | |
3238 | ||
3239 | of->free_input_view(0, this->output_file_size_, iv); | |
3240 | } | |
3241 | ||
516cb3d0 ILT |
3242 | // Write out a binary file. This is called after the link is |
3243 | // complete. IN is the temporary output file we used to generate the | |
3244 | // ELF code. We simply walk through the segments, read them from | |
3245 | // their file offset in IN, and write them to their load address in | |
3246 | // the output file. FIXME: with a bit more work, we could support | |
3247 | // S-records and/or Intel hex format here. | |
3248 | ||
3249 | void | |
3250 | Layout::write_binary(Output_file* in) const | |
3251 | { | |
e55bde5e | 3252 | gold_assert(parameters->options().oformat_enum() |
bc644c6c | 3253 | == General_options::OBJECT_FORMAT_BINARY); |
516cb3d0 ILT |
3254 | |
3255 | // Get the size of the binary file. | |
3256 | uint64_t max_load_address = 0; | |
3257 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3258 | p != this->segment_list_.end(); | |
3259 | ++p) | |
3260 | { | |
3261 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
3262 | { | |
3263 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); | |
3264 | if (max_paddr > max_load_address) | |
3265 | max_load_address = max_paddr; | |
3266 | } | |
3267 | } | |
3268 | ||
8851ecca | 3269 | Output_file out(parameters->options().output_file_name()); |
516cb3d0 ILT |
3270 | out.open(max_load_address); |
3271 | ||
3272 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3273 | p != this->segment_list_.end(); | |
3274 | ++p) | |
3275 | { | |
3276 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
3277 | { | |
3278 | const unsigned char* vin = in->get_input_view((*p)->offset(), | |
3279 | (*p)->filesz()); | |
3280 | unsigned char* vout = out.get_output_view((*p)->paddr(), | |
3281 | (*p)->filesz()); | |
3282 | memcpy(vout, vin, (*p)->filesz()); | |
3283 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); | |
3284 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); | |
3285 | } | |
3286 | } | |
3287 | ||
3288 | out.close(); | |
3289 | } | |
3290 | ||
7d9e3d98 ILT |
3291 | // Print the output sections to the map file. |
3292 | ||
3293 | void | |
3294 | Layout::print_to_mapfile(Mapfile* mapfile) const | |
3295 | { | |
3296 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3297 | p != this->segment_list_.end(); | |
3298 | ++p) | |
3299 | (*p)->print_sections_to_mapfile(mapfile); | |
3300 | } | |
3301 | ||
ad8f37d1 ILT |
3302 | // Print statistical information to stderr. This is used for --stats. |
3303 | ||
3304 | void | |
3305 | Layout::print_stats() const | |
3306 | { | |
3307 | this->namepool_.print_stats("section name pool"); | |
3308 | this->sympool_.print_stats("output symbol name pool"); | |
3309 | this->dynpool_.print_stats("dynamic name pool"); | |
38c5e8b4 ILT |
3310 | |
3311 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3312 | p != this->section_list_.end(); | |
3313 | ++p) | |
3314 | (*p)->print_merge_stats(); | |
ad8f37d1 ILT |
3315 | } |
3316 | ||
730cdc88 ILT |
3317 | // Write_sections_task methods. |
3318 | ||
3319 | // We can always run this task. | |
3320 | ||
17a1d0a9 ILT |
3321 | Task_token* |
3322 | Write_sections_task::is_runnable() | |
730cdc88 | 3323 | { |
17a1d0a9 | 3324 | return NULL; |
730cdc88 ILT |
3325 | } |
3326 | ||
3327 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
3328 | // when finished. | |
3329 | ||
17a1d0a9 ILT |
3330 | void |
3331 | Write_sections_task::locks(Task_locker* tl) | |
730cdc88 | 3332 | { |
17a1d0a9 ILT |
3333 | tl->add(this, this->output_sections_blocker_); |
3334 | tl->add(this, this->final_blocker_); | |
730cdc88 ILT |
3335 | } |
3336 | ||
3337 | // Run the task--write out the data. | |
3338 | ||
3339 | void | |
3340 | Write_sections_task::run(Workqueue*) | |
3341 | { | |
3342 | this->layout_->write_output_sections(this->of_); | |
3343 | } | |
3344 | ||
61ba1cf9 ILT |
3345 | // Write_data_task methods. |
3346 | ||
3347 | // We can always run this task. | |
3348 | ||
17a1d0a9 ILT |
3349 | Task_token* |
3350 | Write_data_task::is_runnable() | |
61ba1cf9 | 3351 | { |
17a1d0a9 | 3352 | return NULL; |
61ba1cf9 ILT |
3353 | } |
3354 | ||
3355 | // We need to unlock FINAL_BLOCKER when finished. | |
3356 | ||
17a1d0a9 ILT |
3357 | void |
3358 | Write_data_task::locks(Task_locker* tl) | |
61ba1cf9 | 3359 | { |
17a1d0a9 | 3360 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
3361 | } |
3362 | ||
3363 | // Run the task--write out the data. | |
3364 | ||
3365 | void | |
3366 | Write_data_task::run(Workqueue*) | |
3367 | { | |
9025d29d | 3368 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
3369 | } |
3370 | ||
3371 | // Write_symbols_task methods. | |
3372 | ||
3373 | // We can always run this task. | |
3374 | ||
17a1d0a9 ILT |
3375 | Task_token* |
3376 | Write_symbols_task::is_runnable() | |
61ba1cf9 | 3377 | { |
17a1d0a9 | 3378 | return NULL; |
61ba1cf9 ILT |
3379 | } |
3380 | ||
3381 | // We need to unlock FINAL_BLOCKER when finished. | |
3382 | ||
17a1d0a9 ILT |
3383 | void |
3384 | Write_symbols_task::locks(Task_locker* tl) | |
61ba1cf9 | 3385 | { |
17a1d0a9 | 3386 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
3387 | } |
3388 | ||
3389 | // Run the task--write out the symbols. | |
3390 | ||
3391 | void | |
3392 | Write_symbols_task::run(Workqueue*) | |
3393 | { | |
fd9d194f ILT |
3394 | this->symtab_->write_globals(this->sympool_, this->dynpool_, |
3395 | this->layout_->symtab_xindex(), | |
d491d34e | 3396 | this->layout_->dynsym_xindex(), this->of_); |
61ba1cf9 ILT |
3397 | } |
3398 | ||
730cdc88 ILT |
3399 | // Write_after_input_sections_task methods. |
3400 | ||
3401 | // We can only run this task after the input sections have completed. | |
3402 | ||
17a1d0a9 ILT |
3403 | Task_token* |
3404 | Write_after_input_sections_task::is_runnable() | |
730cdc88 ILT |
3405 | { |
3406 | if (this->input_sections_blocker_->is_blocked()) | |
17a1d0a9 ILT |
3407 | return this->input_sections_blocker_; |
3408 | return NULL; | |
730cdc88 ILT |
3409 | } |
3410 | ||
3411 | // We need to unlock FINAL_BLOCKER when finished. | |
3412 | ||
17a1d0a9 ILT |
3413 | void |
3414 | Write_after_input_sections_task::locks(Task_locker* tl) | |
730cdc88 | 3415 | { |
17a1d0a9 | 3416 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
3417 | } |
3418 | ||
3419 | // Run the task. | |
3420 | ||
3421 | void | |
3422 | Write_after_input_sections_task::run(Workqueue*) | |
3423 | { | |
3424 | this->layout_->write_sections_after_input_sections(this->of_); | |
3425 | } | |
3426 | ||
92e059d8 | 3427 | // Close_task_runner methods. |
61ba1cf9 ILT |
3428 | |
3429 | // Run the task--close the file. | |
3430 | ||
3431 | void | |
17a1d0a9 | 3432 | Close_task_runner::run(Workqueue*, const Task*) |
61ba1cf9 | 3433 | { |
8ed814a9 ILT |
3434 | // If we need to compute a checksum for the BUILD if, we do so here. |
3435 | this->layout_->write_build_id(this->of_); | |
3436 | ||
516cb3d0 | 3437 | // If we've been asked to create a binary file, we do so here. |
7cc619c3 | 3438 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
3439 | this->layout_->write_binary(this->of_); |
3440 | ||
61ba1cf9 ILT |
3441 | this->of_->close(); |
3442 | } | |
3443 | ||
a2fb1b05 ILT |
3444 | // Instantiate the templates we need. We could use the configure |
3445 | // script to restrict this to only the ones for implemented targets. | |
3446 | ||
193a53d9 | 3447 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 ILT |
3448 | template |
3449 | Output_section* | |
730cdc88 ILT |
3450 | Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx, |
3451 | const char* name, | |
3452 | const elfcpp::Shdr<32, false>& shdr, | |
3453 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3454 | #endif |
a2fb1b05 | 3455 | |
193a53d9 | 3456 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
3457 | template |
3458 | Output_section* | |
730cdc88 ILT |
3459 | Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx, |
3460 | const char* name, | |
3461 | const elfcpp::Shdr<32, true>& shdr, | |
3462 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3463 | #endif |
a2fb1b05 | 3464 | |
193a53d9 | 3465 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
3466 | template |
3467 | Output_section* | |
730cdc88 ILT |
3468 | Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx, |
3469 | const char* name, | |
3470 | const elfcpp::Shdr<64, false>& shdr, | |
3471 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3472 | #endif |
a2fb1b05 | 3473 | |
193a53d9 | 3474 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
3475 | template |
3476 | Output_section* | |
730cdc88 ILT |
3477 | Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx, |
3478 | const char* name, | |
3479 | const elfcpp::Shdr<64, true>& shdr, | |
3480 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3481 | #endif |
a2fb1b05 | 3482 | |
6a74a719 ILT |
3483 | #ifdef HAVE_TARGET_32_LITTLE |
3484 | template | |
3485 | Output_section* | |
3486 | Layout::layout_reloc<32, false>(Sized_relobj<32, false>* object, | |
3487 | unsigned int reloc_shndx, | |
3488 | const elfcpp::Shdr<32, false>& shdr, | |
3489 | Output_section* data_section, | |
3490 | Relocatable_relocs* rr); | |
3491 | #endif | |
3492 | ||
3493 | #ifdef HAVE_TARGET_32_BIG | |
3494 | template | |
3495 | Output_section* | |
3496 | Layout::layout_reloc<32, true>(Sized_relobj<32, true>* object, | |
3497 | unsigned int reloc_shndx, | |
3498 | const elfcpp::Shdr<32, true>& shdr, | |
3499 | Output_section* data_section, | |
3500 | Relocatable_relocs* rr); | |
3501 | #endif | |
3502 | ||
3503 | #ifdef HAVE_TARGET_64_LITTLE | |
3504 | template | |
3505 | Output_section* | |
3506 | Layout::layout_reloc<64, false>(Sized_relobj<64, false>* object, | |
3507 | unsigned int reloc_shndx, | |
3508 | const elfcpp::Shdr<64, false>& shdr, | |
3509 | Output_section* data_section, | |
3510 | Relocatable_relocs* rr); | |
3511 | #endif | |
3512 | ||
3513 | #ifdef HAVE_TARGET_64_BIG | |
3514 | template | |
3515 | Output_section* | |
3516 | Layout::layout_reloc<64, true>(Sized_relobj<64, true>* object, | |
3517 | unsigned int reloc_shndx, | |
3518 | const elfcpp::Shdr<64, true>& shdr, | |
3519 | Output_section* data_section, | |
3520 | Relocatable_relocs* rr); | |
3521 | #endif | |
3522 | ||
3523 | #ifdef HAVE_TARGET_32_LITTLE | |
3524 | template | |
3525 | void | |
3526 | Layout::layout_group<32, false>(Symbol_table* symtab, | |
3527 | Sized_relobj<32, false>* object, | |
3528 | unsigned int, | |
3529 | const char* group_section_name, | |
3530 | const char* signature, | |
3531 | const elfcpp::Shdr<32, false>& shdr, | |
8825ac63 ILT |
3532 | elfcpp::Elf_Word flags, |
3533 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3534 | #endif |
3535 | ||
3536 | #ifdef HAVE_TARGET_32_BIG | |
3537 | template | |
3538 | void | |
3539 | Layout::layout_group<32, true>(Symbol_table* symtab, | |
3540 | Sized_relobj<32, true>* object, | |
3541 | unsigned int, | |
3542 | const char* group_section_name, | |
3543 | const char* signature, | |
3544 | const elfcpp::Shdr<32, true>& shdr, | |
8825ac63 ILT |
3545 | elfcpp::Elf_Word flags, |
3546 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3547 | #endif |
3548 | ||
3549 | #ifdef HAVE_TARGET_64_LITTLE | |
3550 | template | |
3551 | void | |
3552 | Layout::layout_group<64, false>(Symbol_table* symtab, | |
3553 | Sized_relobj<64, false>* object, | |
3554 | unsigned int, | |
3555 | const char* group_section_name, | |
3556 | const char* signature, | |
3557 | const elfcpp::Shdr<64, false>& shdr, | |
8825ac63 ILT |
3558 | elfcpp::Elf_Word flags, |
3559 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3560 | #endif |
3561 | ||
3562 | #ifdef HAVE_TARGET_64_BIG | |
3563 | template | |
3564 | void | |
3565 | Layout::layout_group<64, true>(Symbol_table* symtab, | |
3566 | Sized_relobj<64, true>* object, | |
3567 | unsigned int, | |
3568 | const char* group_section_name, | |
3569 | const char* signature, | |
3570 | const elfcpp::Shdr<64, true>& shdr, | |
8825ac63 ILT |
3571 | elfcpp::Elf_Word flags, |
3572 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3573 | #endif |
3574 | ||
730cdc88 ILT |
3575 | #ifdef HAVE_TARGET_32_LITTLE |
3576 | template | |
3577 | Output_section* | |
3578 | Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object, | |
3579 | const unsigned char* symbols, | |
3580 | off_t symbols_size, | |
3581 | const unsigned char* symbol_names, | |
3582 | off_t symbol_names_size, | |
3583 | unsigned int shndx, | |
3584 | const elfcpp::Shdr<32, false>& shdr, | |
3585 | unsigned int reloc_shndx, | |
3586 | unsigned int reloc_type, | |
3587 | off_t* off); | |
3588 | #endif | |
3589 | ||
3590 | #ifdef HAVE_TARGET_32_BIG | |
3591 | template | |
3592 | Output_section* | |
3593 | Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object, | |
3594 | const unsigned char* symbols, | |
3595 | off_t symbols_size, | |
3596 | const unsigned char* symbol_names, | |
3597 | off_t symbol_names_size, | |
3598 | unsigned int shndx, | |
3599 | const elfcpp::Shdr<32, true>& shdr, | |
3600 | unsigned int reloc_shndx, | |
3601 | unsigned int reloc_type, | |
3602 | off_t* off); | |
3603 | #endif | |
3604 | ||
3605 | #ifdef HAVE_TARGET_64_LITTLE | |
3606 | template | |
3607 | Output_section* | |
3608 | Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object, | |
3609 | const unsigned char* symbols, | |
3610 | off_t symbols_size, | |
3611 | const unsigned char* symbol_names, | |
3612 | off_t symbol_names_size, | |
3613 | unsigned int shndx, | |
3614 | const elfcpp::Shdr<64, false>& shdr, | |
3615 | unsigned int reloc_shndx, | |
3616 | unsigned int reloc_type, | |
3617 | off_t* off); | |
3618 | #endif | |
3619 | ||
3620 | #ifdef HAVE_TARGET_64_BIG | |
3621 | template | |
3622 | Output_section* | |
3623 | Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object, | |
3624 | const unsigned char* symbols, | |
3625 | off_t symbols_size, | |
3626 | const unsigned char* symbol_names, | |
3627 | off_t symbol_names_size, | |
3628 | unsigned int shndx, | |
3629 | const elfcpp::Shdr<64, true>& shdr, | |
3630 | unsigned int reloc_shndx, | |
3631 | unsigned int reloc_type, | |
3632 | off_t* off); | |
3633 | #endif | |
a2fb1b05 ILT |
3634 | |
3635 | } // End namespace gold. |