Commit | Line | Data |
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a2fb1b05 ILT |
1 | // layout.cc -- lay out output file sections for gold |
2 | ||
e5756efb | 3 | // Copyright 2006, 2007, 2008 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" |
a2fb1b05 ILT |
49 | #include "layout.h" |
50 | ||
51 | namespace gold | |
52 | { | |
53 | ||
92e059d8 | 54 | // Layout_task_runner methods. |
a2fb1b05 ILT |
55 | |
56 | // Lay out the sections. This is called after all the input objects | |
57 | // have been read. | |
58 | ||
59 | void | |
17a1d0a9 | 60 | Layout_task_runner::run(Workqueue* workqueue, const Task* task) |
a2fb1b05 | 61 | { |
12e14209 | 62 | off_t file_size = this->layout_->finalize(this->input_objects_, |
17a1d0a9 | 63 | this->symtab_, |
8851ecca | 64 | this->target_, |
17a1d0a9 | 65 | task); |
61ba1cf9 ILT |
66 | |
67 | // Now we know the final size of the output file and we know where | |
68 | // each piece of information goes. | |
7d9e3d98 ILT |
69 | |
70 | if (this->mapfile_ != NULL) | |
71 | { | |
72 | this->mapfile_->print_discarded_sections(this->input_objects_); | |
73 | this->layout_->print_to_mapfile(this->mapfile_); | |
74 | } | |
75 | ||
8851ecca | 76 | Output_file* of = new Output_file(parameters->options().output_file_name()); |
7cc619c3 | 77 | if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 | 78 | of->set_is_temporary(); |
61ba1cf9 ILT |
79 | of->open(file_size); |
80 | ||
81 | // Queue up the final set of tasks. | |
82 | gold::queue_final_tasks(this->options_, this->input_objects_, | |
12e14209 | 83 | this->symtab_, this->layout_, workqueue, of); |
a2fb1b05 ILT |
84 | } |
85 | ||
86 | // Layout methods. | |
87 | ||
e5756efb | 88 | Layout::Layout(const General_options& options, Script_options* script_options) |
d491d34e ILT |
89 | : options_(options), |
90 | script_options_(script_options), | |
91 | namepool_(), | |
92 | sympool_(), | |
93 | dynpool_(), | |
94 | signatures_(), | |
95 | section_name_map_(), | |
96 | segment_list_(), | |
97 | section_list_(), | |
98 | unattached_section_list_(), | |
99 | sections_are_attached_(false), | |
100 | special_output_list_(), | |
101 | section_headers_(NULL), | |
102 | tls_segment_(NULL), | |
9f1d377b | 103 | relro_segment_(NULL), |
d491d34e ILT |
104 | symtab_section_(NULL), |
105 | symtab_xindex_(NULL), | |
106 | dynsym_section_(NULL), | |
107 | dynsym_xindex_(NULL), | |
108 | dynamic_section_(NULL), | |
109 | dynamic_data_(NULL), | |
110 | eh_frame_section_(NULL), | |
111 | eh_frame_data_(NULL), | |
112 | added_eh_frame_data_(false), | |
113 | eh_frame_hdr_section_(NULL), | |
114 | build_id_note_(NULL), | |
62b01cb5 ILT |
115 | debug_abbrev_(NULL), |
116 | debug_info_(NULL), | |
d491d34e ILT |
117 | group_signatures_(), |
118 | output_file_size_(-1), | |
35cdfc9a ILT |
119 | input_requires_executable_stack_(false), |
120 | input_with_gnu_stack_note_(false), | |
535890bb | 121 | input_without_gnu_stack_note_(false), |
17a1d0a9 ILT |
122 | has_static_tls_(false), |
123 | any_postprocessing_sections_(false) | |
54dc6425 ILT |
124 | { |
125 | // Make space for more than enough segments for a typical file. | |
126 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
127 | this->segment_list_.reserve(12); |
128 | ||
27bc2bce ILT |
129 | // We expect two unattached Output_data objects: the file header and |
130 | // the segment headers. | |
131 | this->special_output_list_.reserve(2); | |
54dc6425 ILT |
132 | } |
133 | ||
a2fb1b05 ILT |
134 | // Hash a key we use to look up an output section mapping. |
135 | ||
136 | size_t | |
137 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
138 | { | |
f0641a0b | 139 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
140 | } |
141 | ||
9e2dcb77 ILT |
142 | // Return whether PREFIX is a prefix of STR. |
143 | ||
144 | static inline bool | |
145 | is_prefix_of(const char* prefix, const char* str) | |
146 | { | |
147 | return strncmp(prefix, str, strlen(prefix)) == 0; | |
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); | |
154e0e9a | 436 | if (is_input_section && !parameters->options().relocatable()) |
a445fddf ILT |
437 | name = Layout::output_section_name(name, &len); |
438 | ||
439 | Stringpool::Key name_key; | |
440 | name = this->namepool_.add_with_length(name, len, true, &name_key); | |
441 | ||
442 | // Find or make the output section. The output section is selected | |
443 | // based on the section name, type, and flags. | |
444 | return this->get_output_section(name, name_key, type, flags); | |
445 | } | |
446 | ||
ead1e424 | 447 | // Return the output section to use for input section SHNDX, with name |
730cdc88 ILT |
448 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
449 | // index of a relocation section which applies to this section, or 0 | |
450 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
451 | // relocation section if there is one. Set *OFF to the offset of this | |
452 | // input section without the output section. Return NULL if the | |
453 | // section should be discarded. Set *OFF to -1 if the section | |
454 | // contents should not be written directly to the output file, but | |
455 | // will instead receive special handling. | |
ead1e424 ILT |
456 | |
457 | template<int size, bool big_endian> | |
458 | Output_section* | |
730cdc88 ILT |
459 | Layout::layout(Sized_relobj<size, big_endian>* object, unsigned int shndx, |
460 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, | |
461 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 | 462 | { |
ef9beddf ILT |
463 | *off = 0; |
464 | ||
ead1e424 ILT |
465 | if (!this->include_section(object, name, shdr)) |
466 | return NULL; | |
467 | ||
6a74a719 ILT |
468 | Output_section* os; |
469 | ||
470 | // In a relocatable link a grouped section must not be combined with | |
471 | // any other sections. | |
8851ecca | 472 | if (parameters->options().relocatable() |
6a74a719 ILT |
473 | && (shdr.get_sh_flags() & elfcpp::SHF_GROUP) != 0) |
474 | { | |
475 | name = this->namepool_.add(name, true, NULL); | |
476 | os = this->make_output_section(name, shdr.get_sh_type(), | |
477 | shdr.get_sh_flags()); | |
478 | } | |
479 | else | |
480 | { | |
481 | os = this->choose_output_section(object, name, shdr.get_sh_type(), | |
482 | shdr.get_sh_flags(), true); | |
483 | if (os == NULL) | |
484 | return NULL; | |
485 | } | |
a2fb1b05 | 486 | |
2fd32231 ILT |
487 | // By default the GNU linker sorts input sections whose names match |
488 | // .ctor.*, .dtor.*, .init_array.*, or .fini_array.*. The sections | |
489 | // are sorted by name. This is used to implement constructor | |
490 | // priority ordering. We are compatible. | |
491 | if (!this->script_options_->saw_sections_clause() | |
492 | && (is_prefix_of(".ctors.", name) | |
493 | || is_prefix_of(".dtors.", name) | |
494 | || is_prefix_of(".init_array.", name) | |
495 | || is_prefix_of(".fini_array.", name))) | |
496 | os->set_must_sort_attached_input_sections(); | |
497 | ||
a2fb1b05 ILT |
498 | // FIXME: Handle SHF_LINK_ORDER somewhere. |
499 | ||
a445fddf ILT |
500 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx, |
501 | this->script_options_->saw_sections_clause()); | |
a2fb1b05 ILT |
502 | |
503 | return os; | |
504 | } | |
505 | ||
6a74a719 ILT |
506 | // Handle a relocation section when doing a relocatable link. |
507 | ||
508 | template<int size, bool big_endian> | |
509 | Output_section* | |
510 | Layout::layout_reloc(Sized_relobj<size, big_endian>* object, | |
511 | unsigned int, | |
512 | const elfcpp::Shdr<size, big_endian>& shdr, | |
513 | Output_section* data_section, | |
514 | Relocatable_relocs* rr) | |
515 | { | |
8851ecca ILT |
516 | gold_assert(parameters->options().relocatable() |
517 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
518 | |
519 | int sh_type = shdr.get_sh_type(); | |
520 | ||
521 | std::string name; | |
522 | if (sh_type == elfcpp::SHT_REL) | |
523 | name = ".rel"; | |
524 | else if (sh_type == elfcpp::SHT_RELA) | |
525 | name = ".rela"; | |
526 | else | |
527 | gold_unreachable(); | |
528 | name += data_section->name(); | |
529 | ||
530 | Output_section* os = this->choose_output_section(object, name.c_str(), | |
531 | sh_type, | |
532 | shdr.get_sh_flags(), | |
533 | false); | |
534 | ||
535 | os->set_should_link_to_symtab(); | |
536 | os->set_info_section(data_section); | |
537 | ||
538 | Output_section_data* posd; | |
539 | if (sh_type == elfcpp::SHT_REL) | |
540 | { | |
541 | os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); | |
542 | posd = new Output_relocatable_relocs<elfcpp::SHT_REL, | |
543 | size, | |
544 | big_endian>(rr); | |
545 | } | |
546 | else if (sh_type == elfcpp::SHT_RELA) | |
547 | { | |
548 | os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); | |
549 | posd = new Output_relocatable_relocs<elfcpp::SHT_RELA, | |
550 | size, | |
551 | big_endian>(rr); | |
552 | } | |
553 | else | |
554 | gold_unreachable(); | |
555 | ||
556 | os->add_output_section_data(posd); | |
557 | rr->set_output_data(posd); | |
558 | ||
559 | return os; | |
560 | } | |
561 | ||
562 | // Handle a group section when doing a relocatable link. | |
563 | ||
564 | template<int size, bool big_endian> | |
565 | void | |
566 | Layout::layout_group(Symbol_table* symtab, | |
567 | Sized_relobj<size, big_endian>* object, | |
568 | unsigned int, | |
569 | const char* group_section_name, | |
570 | const char* signature, | |
571 | const elfcpp::Shdr<size, big_endian>& shdr, | |
8825ac63 ILT |
572 | elfcpp::Elf_Word flags, |
573 | std::vector<unsigned int>* shndxes) | |
6a74a719 | 574 | { |
8851ecca | 575 | gold_assert(parameters->options().relocatable()); |
6a74a719 ILT |
576 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_GROUP); |
577 | group_section_name = this->namepool_.add(group_section_name, true, NULL); | |
578 | Output_section* os = this->make_output_section(group_section_name, | |
579 | elfcpp::SHT_GROUP, | |
580 | shdr.get_sh_flags()); | |
581 | ||
582 | // We need to find a symbol with the signature in the symbol table. | |
755ab8af | 583 | // If we don't find one now, we need to look again later. |
6a74a719 | 584 | Symbol* sym = symtab->lookup(signature, NULL); |
755ab8af ILT |
585 | if (sym != NULL) |
586 | os->set_info_symndx(sym); | |
587 | else | |
588 | { | |
589 | // We will wind up using a symbol whose name is the signature. | |
590 | // So just put the signature in the symbol name pool to save it. | |
591 | signature = symtab->canonicalize_name(signature); | |
592 | this->group_signatures_.push_back(Group_signature(os, signature)); | |
593 | } | |
6a74a719 ILT |
594 | |
595 | os->set_should_link_to_symtab(); | |
6a74a719 ILT |
596 | os->set_entsize(4); |
597 | ||
598 | section_size_type entry_count = | |
599 | convert_to_section_size_type(shdr.get_sh_size() / 4); | |
600 | Output_section_data* posd = | |
8825ac63 ILT |
601 | new Output_data_group<size, big_endian>(object, entry_count, flags, |
602 | shndxes); | |
6a74a719 ILT |
603 | os->add_output_section_data(posd); |
604 | } | |
605 | ||
730cdc88 ILT |
606 | // Special GNU handling of sections name .eh_frame. They will |
607 | // normally hold exception frame data as defined by the C++ ABI | |
608 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
609 | |
610 | template<int size, bool big_endian> | |
730cdc88 ILT |
611 | Output_section* |
612 | Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object, | |
613 | const unsigned char* symbols, | |
614 | off_t symbols_size, | |
615 | const unsigned char* symbol_names, | |
616 | off_t symbol_names_size, | |
3151305a | 617 | unsigned int shndx, |
3151305a | 618 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
619 | unsigned int reloc_shndx, unsigned int reloc_type, |
620 | off_t* off) | |
3151305a | 621 | { |
730cdc88 | 622 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS); |
1650c4ff | 623 | gold_assert((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 | 624 | |
a445fddf ILT |
625 | const char* const name = ".eh_frame"; |
626 | Output_section* os = this->choose_output_section(object, | |
627 | name, | |
628 | elfcpp::SHT_PROGBITS, | |
629 | elfcpp::SHF_ALLOC, | |
630 | false); | |
631 | if (os == NULL) | |
632 | return NULL; | |
730cdc88 | 633 | |
3151305a ILT |
634 | if (this->eh_frame_section_ == NULL) |
635 | { | |
636 | this->eh_frame_section_ = os; | |
730cdc88 | 637 | this->eh_frame_data_ = new Eh_frame(); |
3151305a | 638 | |
45aa233b | 639 | if (this->options_.eh_frame_hdr()) |
3151305a | 640 | { |
3151305a | 641 | Output_section* hdr_os = |
a445fddf ILT |
642 | this->choose_output_section(NULL, |
643 | ".eh_frame_hdr", | |
644 | elfcpp::SHT_PROGBITS, | |
645 | elfcpp::SHF_ALLOC, | |
646 | false); | |
3151305a | 647 | |
a445fddf ILT |
648 | if (hdr_os != NULL) |
649 | { | |
650 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, | |
651 | this->eh_frame_data_); | |
652 | hdr_os->add_output_section_data(hdr_posd); | |
3151305a | 653 | |
a445fddf | 654 | hdr_os->set_after_input_sections(); |
730cdc88 | 655 | |
1c4f3631 ILT |
656 | if (!this->script_options_->saw_phdrs_clause()) |
657 | { | |
658 | Output_segment* hdr_oseg; | |
659 | hdr_oseg = this->make_output_segment(elfcpp::PT_GNU_EH_FRAME, | |
660 | elfcpp::PF_R); | |
661 | hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R); | |
662 | } | |
730cdc88 | 663 | |
a445fddf ILT |
664 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); |
665 | } | |
3151305a ILT |
666 | } |
667 | } | |
668 | ||
669 | gold_assert(this->eh_frame_section_ == os); | |
670 | ||
730cdc88 ILT |
671 | if (this->eh_frame_data_->add_ehframe_input_section(object, |
672 | symbols, | |
673 | symbols_size, | |
674 | symbol_names, | |
675 | symbol_names_size, | |
676 | shndx, | |
677 | reloc_shndx, | |
678 | reloc_type)) | |
2c38906f | 679 | { |
154e0e9a ILT |
680 | os->update_flags_for_input_section(shdr.get_sh_flags()); |
681 | ||
2c38906f ILT |
682 | // We found a .eh_frame section we are going to optimize, so now |
683 | // we can add the set of optimized sections to the output | |
684 | // section. We need to postpone adding this until we've found a | |
685 | // section we can optimize so that the .eh_frame section in | |
686 | // crtbegin.o winds up at the start of the output section. | |
687 | if (!this->added_eh_frame_data_) | |
688 | { | |
689 | os->add_output_section_data(this->eh_frame_data_); | |
690 | this->added_eh_frame_data_ = true; | |
691 | } | |
692 | *off = -1; | |
693 | } | |
730cdc88 ILT |
694 | else |
695 | { | |
696 | // We couldn't handle this .eh_frame section for some reason. | |
697 | // Add it as a normal section. | |
a445fddf ILT |
698 | bool saw_sections_clause = this->script_options_->saw_sections_clause(); |
699 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx, | |
700 | saw_sections_clause); | |
730cdc88 ILT |
701 | } |
702 | ||
703 | return os; | |
3151305a ILT |
704 | } |
705 | ||
9f1d377b ILT |
706 | // Add POSD to an output section using NAME, TYPE, and FLAGS. Return |
707 | // the output section. | |
ead1e424 | 708 | |
9f1d377b | 709 | Output_section* |
ead1e424 ILT |
710 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, |
711 | elfcpp::Elf_Xword flags, | |
712 | Output_section_data* posd) | |
713 | { | |
a445fddf ILT |
714 | Output_section* os = this->choose_output_section(NULL, name, type, flags, |
715 | false); | |
716 | if (os != NULL) | |
717 | os->add_output_section_data(posd); | |
9f1d377b | 718 | return os; |
ead1e424 ILT |
719 | } |
720 | ||
a2fb1b05 ILT |
721 | // Map section flags to segment flags. |
722 | ||
723 | elfcpp::Elf_Word | |
724 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
725 | { | |
726 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
727 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
728 | ret |= elfcpp::PF_W; | |
729 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
730 | ret |= elfcpp::PF_X; | |
731 | return ret; | |
732 | } | |
733 | ||
96803768 ILT |
734 | // Sometimes we compress sections. This is typically done for |
735 | // sections that are not part of normal program execution (such as | |
736 | // .debug_* sections), and where the readers of these sections know | |
737 | // how to deal with compressed sections. (To make it easier for them, | |
738 | // we will rename the ouput section in such cases from .foo to | |
739 | // .foo.zlib.nnnn, where nnnn is the uncompressed size.) This routine | |
740 | // doesn't say for certain whether we'll compress -- it depends on | |
741 | // commandline options as well -- just whether this section is a | |
742 | // candidate for compression. | |
743 | ||
744 | static bool | |
745 | is_compressible_debug_section(const char* secname) | |
746 | { | |
747 | return (strncmp(secname, ".debug", sizeof(".debug") - 1) == 0); | |
748 | } | |
749 | ||
a2fb1b05 ILT |
750 | // Make a new Output_section, and attach it to segments as |
751 | // appropriate. | |
752 | ||
753 | Output_section* | |
754 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
755 | elfcpp::Elf_Xword flags) | |
756 | { | |
96803768 ILT |
757 | Output_section* os; |
758 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
ee1fe73e | 759 | && strcmp(this->options_.compress_debug_sections(), "none") != 0 |
96803768 ILT |
760 | && is_compressible_debug_section(name)) |
761 | os = new Output_compressed_section(&this->options_, name, type, flags); | |
62b01cb5 ILT |
762 | |
763 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
764 | && this->options_.strip_debug_non_line() | |
765 | && strcmp(".debug_abbrev", name) == 0) | |
766 | { | |
767 | os = this->debug_abbrev_ = new Output_reduced_debug_abbrev_section( | |
768 | name, type, flags); | |
769 | if (this->debug_info_) | |
770 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
771 | } | |
772 | else if ((flags & elfcpp::SHF_ALLOC) == 0 | |
773 | && this->options_.strip_debug_non_line() | |
774 | && strcmp(".debug_info", name) == 0) | |
775 | { | |
776 | os = this->debug_info_ = new Output_reduced_debug_info_section( | |
777 | name, type, flags); | |
778 | if (this->debug_abbrev_) | |
779 | this->debug_info_->set_abbreviations(this->debug_abbrev_); | |
780 | } | |
781 | else | |
96803768 ILT |
782 | os = new Output_section(name, type, flags); |
783 | ||
a3ad94ed | 784 | this->section_list_.push_back(os); |
a2fb1b05 | 785 | |
2fd32231 ILT |
786 | // The GNU linker by default sorts some sections by priority, so we |
787 | // do the same. We need to know that this might happen before we | |
788 | // attach any input sections. | |
789 | if (!this->script_options_->saw_sections_clause() | |
790 | && (strcmp(name, ".ctors") == 0 | |
791 | || strcmp(name, ".dtors") == 0 | |
792 | || strcmp(name, ".init_array") == 0 | |
793 | || strcmp(name, ".fini_array") == 0)) | |
794 | os->set_may_sort_attached_input_sections(); | |
795 | ||
9f1d377b ILT |
796 | // With -z relro, we have to recognize the special sections by name. |
797 | // There is no other way. | |
798 | if (!this->script_options_->saw_sections_clause() | |
799 | && parameters->options().relro() | |
800 | && type == elfcpp::SHT_PROGBITS | |
801 | && (flags & elfcpp::SHF_ALLOC) != 0 | |
802 | && (flags & elfcpp::SHF_WRITE) != 0) | |
803 | { | |
804 | if (strcmp(name, ".data.rel.ro") == 0) | |
805 | os->set_is_relro(); | |
806 | else if (strcmp(name, ".data.rel.ro.local") == 0) | |
807 | { | |
808 | os->set_is_relro(); | |
809 | os->set_is_relro_local(); | |
810 | } | |
811 | } | |
812 | ||
154e0e9a ILT |
813 | // If we have already attached the sections to segments, then we |
814 | // need to attach this one now. This happens for sections created | |
815 | // directly by the linker. | |
816 | if (this->sections_are_attached_) | |
817 | this->attach_section_to_segment(os); | |
818 | ||
4e2b1697 ILT |
819 | return os; |
820 | } | |
a445fddf | 821 | |
154e0e9a ILT |
822 | // Attach output sections to segments. This is called after we have |
823 | // seen all the input sections. | |
824 | ||
825 | void | |
826 | Layout::attach_sections_to_segments() | |
827 | { | |
828 | for (Section_list::iterator p = this->section_list_.begin(); | |
829 | p != this->section_list_.end(); | |
830 | ++p) | |
831 | this->attach_section_to_segment(*p); | |
832 | ||
833 | this->sections_are_attached_ = true; | |
834 | } | |
835 | ||
836 | // Attach an output section to a segment. | |
837 | ||
838 | void | |
839 | Layout::attach_section_to_segment(Output_section* os) | |
840 | { | |
841 | if ((os->flags() & elfcpp::SHF_ALLOC) == 0) | |
842 | this->unattached_section_list_.push_back(os); | |
843 | else | |
844 | this->attach_allocated_section_to_segment(os); | |
845 | } | |
846 | ||
4e2b1697 | 847 | // Attach an allocated output section to a segment. |
1c4f3631 | 848 | |
4e2b1697 | 849 | void |
154e0e9a | 850 | Layout::attach_allocated_section_to_segment(Output_section* os) |
4e2b1697 | 851 | { |
154e0e9a | 852 | elfcpp::Elf_Xword flags = os->flags(); |
4e2b1697 | 853 | gold_assert((flags & elfcpp::SHF_ALLOC) != 0); |
a2fb1b05 | 854 | |
4e2b1697 ILT |
855 | if (parameters->options().relocatable()) |
856 | return; | |
a2fb1b05 | 857 | |
4e2b1697 ILT |
858 | // If we have a SECTIONS clause, we can't handle the attachment to |
859 | // segments until after we've seen all the sections. | |
860 | if (this->script_options_->saw_sections_clause()) | |
861 | return; | |
a2fb1b05 | 862 | |
4e2b1697 | 863 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
756ac4a8 | 864 | |
4e2b1697 | 865 | // This output section goes into a PT_LOAD segment. |
a2fb1b05 | 866 | |
4e2b1697 | 867 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); |
a2fb1b05 | 868 | |
4e2b1697 ILT |
869 | // In general the only thing we really care about for PT_LOAD |
870 | // segments is whether or not they are writable, so that is how we | |
871 | // search for them. People who need segments sorted on some other | |
872 | // basis will have to use a linker script. | |
a2fb1b05 | 873 | |
4e2b1697 ILT |
874 | Segment_list::const_iterator p; |
875 | for (p = this->segment_list_.begin(); | |
876 | p != this->segment_list_.end(); | |
877 | ++p) | |
878 | { | |
879 | if ((*p)->type() == elfcpp::PT_LOAD | |
af6156ef ILT |
880 | && (parameters->options().omagic() |
881 | || ((*p)->flags() & elfcpp::PF_W) == (seg_flags & elfcpp::PF_W))) | |
4e2b1697 ILT |
882 | { |
883 | // If -Tbss was specified, we need to separate the data | |
884 | // and BSS segments. | |
885 | if (this->options_.user_set_Tbss()) | |
886 | { | |
887 | if ((os->type() == elfcpp::SHT_NOBITS) | |
888 | == (*p)->has_any_data_sections()) | |
889 | continue; | |
890 | } | |
891 | ||
892 | (*p)->add_output_section(os, seg_flags); | |
893 | break; | |
894 | } | |
895 | } | |
54dc6425 | 896 | |
4e2b1697 ILT |
897 | if (p == this->segment_list_.end()) |
898 | { | |
899 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_LOAD, | |
900 | seg_flags); | |
901 | oseg->add_output_section(os, seg_flags); | |
a2fb1b05 ILT |
902 | } |
903 | ||
4e2b1697 ILT |
904 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE |
905 | // segment. | |
906 | if (os->type() == elfcpp::SHT_NOTE) | |
907 | { | |
908 | // See if we already have an equivalent PT_NOTE segment. | |
909 | for (p = this->segment_list_.begin(); | |
910 | p != segment_list_.end(); | |
911 | ++p) | |
912 | { | |
913 | if ((*p)->type() == elfcpp::PT_NOTE | |
914 | && (((*p)->flags() & elfcpp::PF_W) | |
915 | == (seg_flags & elfcpp::PF_W))) | |
916 | { | |
917 | (*p)->add_output_section(os, seg_flags); | |
918 | break; | |
919 | } | |
920 | } | |
921 | ||
922 | if (p == this->segment_list_.end()) | |
923 | { | |
924 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_NOTE, | |
925 | seg_flags); | |
926 | oseg->add_output_section(os, seg_flags); | |
927 | } | |
928 | } | |
929 | ||
930 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
931 | // segment. There can only be one such segment. | |
932 | if ((flags & elfcpp::SHF_TLS) != 0) | |
933 | { | |
934 | if (this->tls_segment_ == NULL) | |
2d924fd9 | 935 | this->make_output_segment(elfcpp::PT_TLS, seg_flags); |
4e2b1697 ILT |
936 | this->tls_segment_->add_output_section(os, seg_flags); |
937 | } | |
9f1d377b ILT |
938 | |
939 | // If -z relro is in effect, and we see a relro section, we create a | |
940 | // PT_GNU_RELRO segment. There can only be one such segment. | |
941 | if (os->is_relro() && parameters->options().relro()) | |
942 | { | |
943 | gold_assert(seg_flags == (elfcpp::PF_R | elfcpp::PF_W)); | |
944 | if (this->relro_segment_ == NULL) | |
2d924fd9 | 945 | this->make_output_segment(elfcpp::PT_GNU_RELRO, seg_flags); |
9f1d377b ILT |
946 | this->relro_segment_->add_output_section(os, seg_flags); |
947 | } | |
a2fb1b05 ILT |
948 | } |
949 | ||
919ed24c ILT |
950 | // Make an output section for a script. |
951 | ||
952 | Output_section* | |
953 | Layout::make_output_section_for_script(const char* name) | |
954 | { | |
955 | name = this->namepool_.add(name, false, NULL); | |
956 | Output_section* os = this->make_output_section(name, elfcpp::SHT_PROGBITS, | |
957 | elfcpp::SHF_ALLOC); | |
958 | os->set_found_in_sections_clause(); | |
959 | return os; | |
960 | } | |
961 | ||
3802b2dd ILT |
962 | // Return the number of segments we expect to see. |
963 | ||
964 | size_t | |
965 | Layout::expected_segment_count() const | |
966 | { | |
967 | size_t ret = this->segment_list_.size(); | |
968 | ||
969 | // If we didn't see a SECTIONS clause in a linker script, we should | |
970 | // already have the complete list of segments. Otherwise we ask the | |
971 | // SECTIONS clause how many segments it expects, and add in the ones | |
972 | // we already have (PT_GNU_STACK, PT_GNU_EH_FRAME, etc.) | |
973 | ||
974 | if (!this->script_options_->saw_sections_clause()) | |
975 | return ret; | |
976 | else | |
977 | { | |
978 | const Script_sections* ss = this->script_options_->script_sections(); | |
979 | return ret + ss->expected_segment_count(this); | |
980 | } | |
981 | } | |
982 | ||
35cdfc9a ILT |
983 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
984 | // is whether we saw a .note.GNU-stack section in the object file. | |
985 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
986 | // protection required for stack memory. We record this in an | |
987 | // executable as a PT_GNU_STACK segment. If an object file does not | |
988 | // have a .note.GNU-stack segment, we must assume that it is an old | |
989 | // object. On some targets that will force an executable stack. | |
990 | ||
991 | void | |
992 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags) | |
993 | { | |
994 | if (!seen_gnu_stack) | |
995 | this->input_without_gnu_stack_note_ = true; | |
996 | else | |
997 | { | |
998 | this->input_with_gnu_stack_note_ = true; | |
999 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
1000 | this->input_requires_executable_stack_ = true; | |
1001 | } | |
1002 | } | |
1003 | ||
a3ad94ed ILT |
1004 | // Create the dynamic sections which are needed before we read the |
1005 | // relocs. | |
1006 | ||
1007 | void | |
9b07f471 | 1008 | Layout::create_initial_dynamic_sections(Symbol_table* symtab) |
a3ad94ed | 1009 | { |
436ca963 | 1010 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
1011 | return; |
1012 | ||
3802b2dd ILT |
1013 | this->dynamic_section_ = this->choose_output_section(NULL, ".dynamic", |
1014 | elfcpp::SHT_DYNAMIC, | |
1015 | (elfcpp::SHF_ALLOC | |
1016 | | elfcpp::SHF_WRITE), | |
1017 | false); | |
9f1d377b | 1018 | this->dynamic_section_->set_is_relro(); |
a3ad94ed | 1019 | |
9b07f471 | 1020 | symtab->define_in_output_data("_DYNAMIC", NULL, this->dynamic_section_, 0, 0, |
a3ad94ed ILT |
1021 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, |
1022 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 1023 | |
9025d29d | 1024 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 ILT |
1025 | |
1026 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); | |
a3ad94ed ILT |
1027 | } |
1028 | ||
bfd58944 ILT |
1029 | // For each output section whose name can be represented as C symbol, |
1030 | // define __start and __stop symbols for the section. This is a GNU | |
1031 | // extension. | |
1032 | ||
1033 | void | |
9b07f471 | 1034 | Layout::define_section_symbols(Symbol_table* symtab) |
bfd58944 ILT |
1035 | { |
1036 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1037 | p != this->section_list_.end(); | |
1038 | ++p) | |
1039 | { | |
1040 | const char* const name = (*p)->name(); | |
1041 | if (name[strspn(name, | |
1042 | ("0123456789" | |
1043 | "ABCDEFGHIJKLMNOPWRSTUVWXYZ" | |
1044 | "abcdefghijklmnopqrstuvwxyz" | |
1045 | "_"))] | |
1046 | == '\0') | |
1047 | { | |
1048 | const std::string name_string(name); | |
1049 | const std::string start_name("__start_" + name_string); | |
1050 | const std::string stop_name("__stop_" + name_string); | |
1051 | ||
9b07f471 | 1052 | symtab->define_in_output_data(start_name.c_str(), |
bfd58944 ILT |
1053 | NULL, // version |
1054 | *p, | |
1055 | 0, // value | |
1056 | 0, // symsize | |
1057 | elfcpp::STT_NOTYPE, | |
1058 | elfcpp::STB_GLOBAL, | |
1059 | elfcpp::STV_DEFAULT, | |
1060 | 0, // nonvis | |
1061 | false, // offset_is_from_end | |
a445fddf | 1062 | true); // only_if_ref |
bfd58944 | 1063 | |
9b07f471 | 1064 | symtab->define_in_output_data(stop_name.c_str(), |
bfd58944 ILT |
1065 | NULL, // version |
1066 | *p, | |
1067 | 0, // value | |
1068 | 0, // symsize | |
1069 | elfcpp::STT_NOTYPE, | |
1070 | elfcpp::STB_GLOBAL, | |
1071 | elfcpp::STV_DEFAULT, | |
1072 | 0, // nonvis | |
1073 | true, // offset_is_from_end | |
a445fddf | 1074 | true); // only_if_ref |
bfd58944 ILT |
1075 | } |
1076 | } | |
1077 | } | |
1078 | ||
755ab8af ILT |
1079 | // Define symbols for group signatures. |
1080 | ||
1081 | void | |
1082 | Layout::define_group_signatures(Symbol_table* symtab) | |
1083 | { | |
1084 | for (Group_signatures::iterator p = this->group_signatures_.begin(); | |
1085 | p != this->group_signatures_.end(); | |
1086 | ++p) | |
1087 | { | |
1088 | Symbol* sym = symtab->lookup(p->signature, NULL); | |
1089 | if (sym != NULL) | |
1090 | p->section->set_info_symndx(sym); | |
1091 | else | |
1092 | { | |
1093 | // Force the name of the group section to the group | |
1094 | // signature, and use the group's section symbol as the | |
1095 | // signature symbol. | |
1096 | if (strcmp(p->section->name(), p->signature) != 0) | |
1097 | { | |
1098 | const char* name = this->namepool_.add(p->signature, | |
1099 | true, NULL); | |
1100 | p->section->set_name(name); | |
1101 | } | |
1102 | p->section->set_needs_symtab_index(); | |
1103 | p->section->set_info_section_symndx(p->section); | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | this->group_signatures_.clear(); | |
1108 | } | |
1109 | ||
75f65a3e ILT |
1110 | // Find the first read-only PT_LOAD segment, creating one if |
1111 | // necessary. | |
54dc6425 | 1112 | |
75f65a3e ILT |
1113 | Output_segment* |
1114 | Layout::find_first_load_seg() | |
54dc6425 | 1115 | { |
75f65a3e ILT |
1116 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
1117 | p != this->segment_list_.end(); | |
1118 | ++p) | |
1119 | { | |
1120 | if ((*p)->type() == elfcpp::PT_LOAD | |
1121 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
af6156ef ILT |
1122 | && (parameters->options().omagic() |
1123 | || ((*p)->flags() & elfcpp::PF_W) == 0)) | |
75f65a3e ILT |
1124 | return *p; |
1125 | } | |
1126 | ||
1c4f3631 ILT |
1127 | gold_assert(!this->script_options_->saw_phdrs_clause()); |
1128 | ||
3802b2dd ILT |
1129 | Output_segment* load_seg = this->make_output_segment(elfcpp::PT_LOAD, |
1130 | elfcpp::PF_R); | |
75f65a3e | 1131 | return load_seg; |
54dc6425 ILT |
1132 | } |
1133 | ||
1134 | // Finalize the layout. When this is called, we have created all the | |
1135 | // output sections and all the output segments which are based on | |
1136 | // input sections. We have several things to do, and we have to do | |
1137 | // them in the right order, so that we get the right results correctly | |
1138 | // and efficiently. | |
1139 | ||
1140 | // 1) Finalize the list of output segments and create the segment | |
1141 | // table header. | |
1142 | ||
1143 | // 2) Finalize the dynamic symbol table and associated sections. | |
1144 | ||
1145 | // 3) Determine the final file offset of all the output segments. | |
1146 | ||
1147 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
1148 | // sections. | |
1149 | ||
75f65a3e ILT |
1150 | // 5) Create the symbol table sections and the section name table |
1151 | // section. | |
1152 | ||
1153 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
1154 | // value and make a final determination of which symbols are going |
1155 | // into the output symbol table. | |
1156 | ||
54dc6425 ILT |
1157 | // 7) Create the section table header. |
1158 | ||
1159 | // 8) Determine the final file offset of all the output sections which | |
1160 | // are not SHF_ALLOC, including the section table header. | |
1161 | ||
1162 | // 9) Finalize the ELF file header. | |
1163 | ||
75f65a3e ILT |
1164 | // This function returns the size of the output file. |
1165 | ||
1166 | off_t | |
17a1d0a9 | 1167 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab, |
8851ecca | 1168 | Target* target, const Task* task) |
54dc6425 | 1169 | { |
7e1edb90 | 1170 | target->finalize_sections(this); |
5a6f7e2d | 1171 | |
17a1d0a9 | 1172 | this->count_local_symbols(task, input_objects); |
7bf1f802 | 1173 | |
35cdfc9a ILT |
1174 | this->create_gold_note(); |
1175 | this->create_executable_stack_info(target); | |
8ed814a9 | 1176 | this->create_build_id(); |
4f211c8b | 1177 | |
3802b2dd | 1178 | Output_segment* phdr_seg = NULL; |
8851ecca | 1179 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) |
54dc6425 | 1180 | { |
dbe717ef ILT |
1181 | // There was a dynamic object in the link. We need to create |
1182 | // some information for the dynamic linker. | |
1183 | ||
3802b2dd ILT |
1184 | // Create the PT_PHDR segment which will hold the program |
1185 | // headers. | |
1c4f3631 ILT |
1186 | if (!this->script_options_->saw_phdrs_clause()) |
1187 | phdr_seg = this->make_output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
3802b2dd | 1188 | |
14b31740 ILT |
1189 | // Create the dynamic symbol table, including the hash table. |
1190 | Output_section* dynstr; | |
1191 | std::vector<Symbol*> dynamic_symbols; | |
1192 | unsigned int local_dynamic_count; | |
a5dc0706 ILT |
1193 | Versions versions(*this->script_options()->version_script_info(), |
1194 | &this->dynpool_); | |
9b07f471 | 1195 | this->create_dynamic_symtab(input_objects, symtab, &dynstr, |
14b31740 ILT |
1196 | &local_dynamic_count, &dynamic_symbols, |
1197 | &versions); | |
dbe717ef ILT |
1198 | |
1199 | // Create the .interp section to hold the name of the | |
1200 | // interpreter, and put it in a PT_INTERP segment. | |
8851ecca | 1201 | if (!parameters->options().shared()) |
96f2030e | 1202 | this->create_interp(target); |
a3ad94ed ILT |
1203 | |
1204 | // Finish the .dynamic section to hold the dynamic data, and put | |
1205 | // it in a PT_DYNAMIC segment. | |
16649710 | 1206 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
1207 | |
1208 | // We should have added everything we need to the dynamic string | |
1209 | // table. | |
1210 | this->dynpool_.set_string_offsets(); | |
1211 | ||
1212 | // Create the version sections. We can't do this until the | |
1213 | // dynamic string table is complete. | |
46fe1623 | 1214 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
14b31740 | 1215 | dynamic_symbols, dynstr); |
54dc6425 ILT |
1216 | } |
1217 | ||
a445fddf ILT |
1218 | // If there is a SECTIONS clause, put all the input sections into |
1219 | // the required order. | |
1220 | Output_segment* load_seg; | |
88dd47ac | 1221 | if (this->script_options_->saw_sections_clause()) |
a445fddf | 1222 | load_seg = this->set_section_addresses_from_script(symtab); |
8851ecca | 1223 | else if (parameters->options().relocatable()) |
88dd47ac | 1224 | load_seg = NULL; |
a445fddf ILT |
1225 | else |
1226 | load_seg = this->find_first_load_seg(); | |
54dc6425 | 1227 | |
7cc619c3 | 1228 | if (this->options_.oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
1229 | load_seg = NULL; |
1230 | ||
3802b2dd | 1231 | gold_assert(phdr_seg == NULL || load_seg != NULL); |
75f65a3e ILT |
1232 | |
1233 | // Lay out the segment headers. | |
75f65a3e | 1234 | Output_segment_headers* segment_headers; |
8851ecca | 1235 | if (parameters->options().relocatable()) |
6a74a719 ILT |
1236 | segment_headers = NULL; |
1237 | else | |
1238 | { | |
1239 | segment_headers = new Output_segment_headers(this->segment_list_); | |
1240 | if (load_seg != NULL) | |
1241 | load_seg->add_initial_output_data(segment_headers); | |
1242 | if (phdr_seg != NULL) | |
1243 | phdr_seg->add_initial_output_data(segment_headers); | |
1244 | } | |
75f65a3e ILT |
1245 | |
1246 | // Lay out the file header. | |
1247 | Output_file_header* file_header; | |
d391083d | 1248 | file_header = new Output_file_header(target, symtab, segment_headers, |
a5dc0706 | 1249 | this->options_.entry()); |
a445fddf ILT |
1250 | if (load_seg != NULL) |
1251 | load_seg->add_initial_output_data(file_header); | |
1252 | ||
61ba1cf9 | 1253 | this->special_output_list_.push_back(file_header); |
6a74a719 ILT |
1254 | if (segment_headers != NULL) |
1255 | this->special_output_list_.push_back(segment_headers); | |
75f65a3e | 1256 | |
6a74a719 | 1257 | if (this->script_options_->saw_phdrs_clause() |
8851ecca | 1258 | && !parameters->options().relocatable()) |
1c4f3631 ILT |
1259 | { |
1260 | // Support use of FILEHDRS and PHDRS attachments in a PHDRS | |
1261 | // clause in a linker script. | |
1262 | Script_sections* ss = this->script_options_->script_sections(); | |
1263 | ss->put_headers_in_phdrs(file_header, segment_headers); | |
1264 | } | |
1265 | ||
ead1e424 | 1266 | // We set the output section indexes in set_segment_offsets and |
27bc2bce | 1267 | // set_section_indexes. |
ead1e424 ILT |
1268 | unsigned int shndx = 1; |
1269 | ||
1270 | // Set the file offsets of all the segments, and all the sections | |
1271 | // they contain. | |
6a74a719 | 1272 | off_t off; |
8851ecca | 1273 | if (!parameters->options().relocatable()) |
6a74a719 ILT |
1274 | off = this->set_segment_offsets(target, load_seg, &shndx); |
1275 | else | |
1276 | off = this->set_relocatable_section_offsets(file_header, &shndx); | |
75f65a3e | 1277 | |
a9a60db6 ILT |
1278 | // Set the file offsets of all the non-data sections we've seen so |
1279 | // far which don't have to wait for the input sections. We need | |
1280 | // this in order to finalize local symbols in non-allocated | |
1281 | // sections. | |
1282 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); | |
1283 | ||
d491d34e ILT |
1284 | // Set the section indexes of all unallocated sections seen so far, |
1285 | // in case any of them are somehow referenced by a symbol. | |
1286 | shndx = this->set_section_indexes(shndx); | |
1287 | ||
75f65a3e | 1288 | // Create the symbol table sections. |
d491d34e | 1289 | this->create_symtab_sections(input_objects, symtab, shndx, &off); |
7bf1f802 ILT |
1290 | if (!parameters->doing_static_link()) |
1291 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e | 1292 | |
e5756efb ILT |
1293 | // Process any symbol assignments from a linker script. This must |
1294 | // be called after the symbol table has been finalized. | |
1295 | this->script_options_->finalize_symbols(symtab, this); | |
1296 | ||
75f65a3e ILT |
1297 | // Create the .shstrtab section. |
1298 | Output_section* shstrtab_section = this->create_shstrtab(); | |
1299 | ||
a9a60db6 ILT |
1300 | // Set the file offsets of the rest of the non-data sections which |
1301 | // don't have to wait for the input sections. | |
9a0910c3 | 1302 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 | 1303 | |
d491d34e ILT |
1304 | // Now that all sections have been created, set the section indexes |
1305 | // for any sections which haven't been done yet. | |
86887060 | 1306 | shndx = this->set_section_indexes(shndx); |
ead1e424 | 1307 | |
75f65a3e | 1308 | // Create the section table header. |
d491d34e | 1309 | this->create_shdrs(shstrtab_section, &off); |
75f65a3e | 1310 | |
17a1d0a9 ILT |
1311 | // If there are no sections which require postprocessing, we can |
1312 | // handle the section names now, and avoid a resize later. | |
1313 | if (!this->any_postprocessing_sections_) | |
1314 | off = this->set_section_offsets(off, | |
1315 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
1316 | ||
27bc2bce | 1317 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 1318 | |
27bc2bce ILT |
1319 | // Now we know exactly where everything goes in the output file |
1320 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 1321 | Output_data::layout_complete(); |
75f65a3e | 1322 | |
e44fcf3b ILT |
1323 | this->output_file_size_ = off; |
1324 | ||
75f65a3e ILT |
1325 | return off; |
1326 | } | |
1327 | ||
8ed814a9 ILT |
1328 | // Create a note header following the format defined in the ELF ABI. |
1329 | // NAME is the name, NOTE_TYPE is the type, DESCSZ is the size of the | |
1330 | // descriptor. ALLOCATE is true if the section should be allocated in | |
1331 | // memory. This returns the new note section. It sets | |
1332 | // *TRAILING_PADDING to the number of trailing zero bytes required. | |
4f211c8b | 1333 | |
8ed814a9 ILT |
1334 | Output_section* |
1335 | Layout::create_note(const char* name, int note_type, size_t descsz, | |
1336 | bool allocate, size_t* trailing_padding) | |
4f211c8b | 1337 | { |
e2305dc0 ILT |
1338 | // Authorities all agree that the values in a .note field should |
1339 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
1340 | // they differ on what the alignment is for 64-bit binaries. | |
1341 | // The GABI says unambiguously they take 8-byte alignment: | |
1342 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
1343 | // Other documentation says alignment should always be 4 bytes: | |
1344 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
1345 | // GNU ld and GNU readelf both support the latter (at least as of | |
1346 | // version 2.16.91), and glibc always generates the latter for | |
1347 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
1348 | // here. | |
35cdfc9a | 1349 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
8851ecca | 1350 | const int size = parameters->target().get_size(); |
e2305dc0 ILT |
1351 | #else |
1352 | const int size = 32; | |
1353 | #endif | |
4f211c8b ILT |
1354 | |
1355 | // The contents of the .note section. | |
4f211c8b ILT |
1356 | size_t namesz = strlen(name) + 1; |
1357 | size_t aligned_namesz = align_address(namesz, size / 8); | |
4f211c8b | 1358 | size_t aligned_descsz = align_address(descsz, size / 8); |
4f211c8b | 1359 | |
8ed814a9 | 1360 | size_t notehdrsz = 3 * (size / 8) + aligned_namesz; |
4f211c8b | 1361 | |
8ed814a9 ILT |
1362 | unsigned char* buffer = new unsigned char[notehdrsz]; |
1363 | memset(buffer, 0, notehdrsz); | |
4f211c8b | 1364 | |
8851ecca | 1365 | bool is_big_endian = parameters->target().is_big_endian(); |
4f211c8b ILT |
1366 | |
1367 | if (size == 32) | |
1368 | { | |
1369 | if (!is_big_endian) | |
1370 | { | |
1371 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
1372 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
1373 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
1374 | } | |
1375 | else | |
1376 | { | |
1377 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
1378 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
1379 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
1380 | } | |
1381 | } | |
1382 | else if (size == 64) | |
1383 | { | |
1384 | if (!is_big_endian) | |
1385 | { | |
1386 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
1387 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
1388 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
1389 | } | |
1390 | else | |
1391 | { | |
1392 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
1393 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
1394 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
1395 | } | |
1396 | } | |
1397 | else | |
1398 | gold_unreachable(); | |
1399 | ||
1400 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
4f211c8b | 1401 | |
cfd73a4e | 1402 | const char* note_name = this->namepool_.add(".note", false, NULL); |
8ed814a9 ILT |
1403 | elfcpp::Elf_Xword flags = 0; |
1404 | if (allocate) | |
1405 | flags = elfcpp::SHF_ALLOC; | |
4f211c8b ILT |
1406 | Output_section* os = this->make_output_section(note_name, |
1407 | elfcpp::SHT_NOTE, | |
8ed814a9 ILT |
1408 | flags); |
1409 | Output_section_data* posd = new Output_data_const_buffer(buffer, notehdrsz, | |
7d9e3d98 ILT |
1410 | size / 8, |
1411 | "** note header"); | |
8ed814a9 ILT |
1412 | os->add_output_section_data(posd); |
1413 | ||
1414 | *trailing_padding = aligned_descsz - descsz; | |
1415 | ||
1416 | return os; | |
1417 | } | |
1418 | ||
1419 | // For an executable or shared library, create a note to record the | |
1420 | // version of gold used to create the binary. | |
1421 | ||
1422 | void | |
1423 | Layout::create_gold_note() | |
1424 | { | |
1425 | if (parameters->options().relocatable()) | |
1426 | return; | |
1427 | ||
1428 | std::string desc = std::string("gold ") + gold::get_version_string(); | |
1429 | ||
1430 | size_t trailing_padding; | |
1431 | Output_section *os = this->create_note("GNU", elfcpp::NT_GNU_GOLD_VERSION, | |
1432 | desc.size(), false, &trailing_padding); | |
1433 | ||
1434 | Output_section_data* posd = new Output_data_const(desc, 4); | |
4f211c8b | 1435 | os->add_output_section_data(posd); |
8ed814a9 ILT |
1436 | |
1437 | if (trailing_padding > 0) | |
1438 | { | |
7d9e3d98 | 1439 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
1440 | os->add_output_section_data(posd); |
1441 | } | |
4f211c8b ILT |
1442 | } |
1443 | ||
35cdfc9a ILT |
1444 | // Record whether the stack should be executable. This can be set |
1445 | // from the command line using the -z execstack or -z noexecstack | |
1446 | // options. Otherwise, if any input file has a .note.GNU-stack | |
1447 | // section with the SHF_EXECINSTR flag set, the stack should be | |
1448 | // executable. Otherwise, if at least one input file a | |
1449 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
1450 | // section, we use the target default for whether the stack should be | |
1451 | // executable. Otherwise, we don't generate a stack note. When | |
1452 | // generating a object file, we create a .note.GNU-stack section with | |
1453 | // the appropriate marking. When generating an executable or shared | |
1454 | // library, we create a PT_GNU_STACK segment. | |
1455 | ||
1456 | void | |
1457 | Layout::create_executable_stack_info(const Target* target) | |
1458 | { | |
1459 | bool is_stack_executable; | |
1460 | if (this->options_.is_execstack_set()) | |
1461 | is_stack_executable = this->options_.is_stack_executable(); | |
1462 | else if (!this->input_with_gnu_stack_note_) | |
1463 | return; | |
1464 | else | |
1465 | { | |
1466 | if (this->input_requires_executable_stack_) | |
1467 | is_stack_executable = true; | |
1468 | else if (this->input_without_gnu_stack_note_) | |
1469 | is_stack_executable = target->is_default_stack_executable(); | |
1470 | else | |
1471 | is_stack_executable = false; | |
1472 | } | |
1473 | ||
8851ecca | 1474 | if (parameters->options().relocatable()) |
35cdfc9a ILT |
1475 | { |
1476 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
1477 | elfcpp::Elf_Xword flags = 0; | |
1478 | if (is_stack_executable) | |
1479 | flags |= elfcpp::SHF_EXECINSTR; | |
1480 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags); | |
1481 | } | |
1482 | else | |
1483 | { | |
1c4f3631 ILT |
1484 | if (this->script_options_->saw_phdrs_clause()) |
1485 | return; | |
35cdfc9a ILT |
1486 | int flags = elfcpp::PF_R | elfcpp::PF_W; |
1487 | if (is_stack_executable) | |
1488 | flags |= elfcpp::PF_X; | |
3802b2dd | 1489 | this->make_output_segment(elfcpp::PT_GNU_STACK, flags); |
35cdfc9a ILT |
1490 | } |
1491 | } | |
1492 | ||
8ed814a9 ILT |
1493 | // If --build-id was used, set up the build ID note. |
1494 | ||
1495 | void | |
1496 | Layout::create_build_id() | |
1497 | { | |
1498 | if (!parameters->options().user_set_build_id()) | |
1499 | return; | |
1500 | ||
1501 | const char* style = parameters->options().build_id(); | |
1502 | if (strcmp(style, "none") == 0) | |
1503 | return; | |
1504 | ||
1505 | // Set DESCSZ to the size of the note descriptor. When possible, | |
1506 | // set DESC to the note descriptor contents. | |
1507 | size_t descsz; | |
1508 | std::string desc; | |
1509 | if (strcmp(style, "md5") == 0) | |
1510 | descsz = 128 / 8; | |
1511 | else if (strcmp(style, "sha1") == 0) | |
1512 | descsz = 160 / 8; | |
1513 | else if (strcmp(style, "uuid") == 0) | |
1514 | { | |
1515 | const size_t uuidsz = 128 / 8; | |
1516 | ||
1517 | char buffer[uuidsz]; | |
1518 | memset(buffer, 0, uuidsz); | |
1519 | ||
2a00e4fb | 1520 | int descriptor = open_descriptor(-1, "/dev/urandom", O_RDONLY); |
8ed814a9 ILT |
1521 | if (descriptor < 0) |
1522 | gold_error(_("--build-id=uuid failed: could not open /dev/urandom: %s"), | |
1523 | strerror(errno)); | |
1524 | else | |
1525 | { | |
1526 | ssize_t got = ::read(descriptor, buffer, uuidsz); | |
2a00e4fb | 1527 | release_descriptor(descriptor, true); |
8ed814a9 ILT |
1528 | if (got < 0) |
1529 | gold_error(_("/dev/urandom: read failed: %s"), strerror(errno)); | |
1530 | else if (static_cast<size_t>(got) != uuidsz) | |
1531 | gold_error(_("/dev/urandom: expected %zu bytes, got %zd bytes"), | |
1532 | uuidsz, got); | |
1533 | } | |
1534 | ||
1535 | desc.assign(buffer, uuidsz); | |
1536 | descsz = uuidsz; | |
1537 | } | |
1538 | else if (strncmp(style, "0x", 2) == 0) | |
1539 | { | |
1540 | hex_init(); | |
1541 | const char* p = style + 2; | |
1542 | while (*p != '\0') | |
1543 | { | |
1544 | if (hex_p(p[0]) && hex_p(p[1])) | |
1545 | { | |
1546 | char c = (hex_value(p[0]) << 4) | hex_value(p[1]); | |
1547 | desc += c; | |
1548 | p += 2; | |
1549 | } | |
1550 | else if (*p == '-' || *p == ':') | |
1551 | ++p; | |
1552 | else | |
1553 | gold_fatal(_("--build-id argument '%s' not a valid hex number"), | |
1554 | style); | |
1555 | } | |
1556 | descsz = desc.size(); | |
1557 | } | |
1558 | else | |
1559 | gold_fatal(_("unrecognized --build-id argument '%s'"), style); | |
1560 | ||
1561 | // Create the note. | |
1562 | size_t trailing_padding; | |
1563 | Output_section* os = this->create_note("GNU", elfcpp::NT_GNU_BUILD_ID, | |
1564 | descsz, true, &trailing_padding); | |
1565 | ||
1566 | if (!desc.empty()) | |
1567 | { | |
1568 | // We know the value already, so we fill it in now. | |
1569 | gold_assert(desc.size() == descsz); | |
1570 | ||
1571 | Output_section_data* posd = new Output_data_const(desc, 4); | |
1572 | os->add_output_section_data(posd); | |
1573 | ||
1574 | if (trailing_padding != 0) | |
1575 | { | |
7d9e3d98 | 1576 | posd = new Output_data_zero_fill(trailing_padding, 0); |
8ed814a9 ILT |
1577 | os->add_output_section_data(posd); |
1578 | } | |
1579 | } | |
1580 | else | |
1581 | { | |
1582 | // We need to compute a checksum after we have completed the | |
1583 | // link. | |
1584 | gold_assert(trailing_padding == 0); | |
7d9e3d98 | 1585 | this->build_id_note_ = new Output_data_zero_fill(descsz, 4); |
8ed814a9 ILT |
1586 | os->add_output_section_data(this->build_id_note_); |
1587 | os->set_after_input_sections(); | |
1588 | } | |
1589 | } | |
1590 | ||
75f65a3e ILT |
1591 | // Return whether SEG1 should be before SEG2 in the output file. This |
1592 | // is based entirely on the segment type and flags. When this is | |
1593 | // called the segment addresses has normally not yet been set. | |
1594 | ||
1595 | bool | |
1596 | Layout::segment_precedes(const Output_segment* seg1, | |
1597 | const Output_segment* seg2) | |
1598 | { | |
1599 | elfcpp::Elf_Word type1 = seg1->type(); | |
1600 | elfcpp::Elf_Word type2 = seg2->type(); | |
1601 | ||
1602 | // The single PT_PHDR segment is required to precede any loadable | |
1603 | // segment. We simply make it always first. | |
1604 | if (type1 == elfcpp::PT_PHDR) | |
1605 | { | |
a3ad94ed | 1606 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
1607 | return true; |
1608 | } | |
1609 | if (type2 == elfcpp::PT_PHDR) | |
1610 | return false; | |
1611 | ||
1612 | // The single PT_INTERP segment is required to precede any loadable | |
1613 | // segment. We simply make it always second. | |
1614 | if (type1 == elfcpp::PT_INTERP) | |
1615 | { | |
a3ad94ed | 1616 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
1617 | return true; |
1618 | } | |
1619 | if (type2 == elfcpp::PT_INTERP) | |
1620 | return false; | |
1621 | ||
1622 | // We then put PT_LOAD segments before any other segments. | |
1623 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
1624 | return true; | |
1625 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
1626 | return false; | |
1627 | ||
9f1d377b ILT |
1628 | // We put the PT_TLS segment last except for the PT_GNU_RELRO |
1629 | // segment, because that is where the dynamic linker expects to find | |
1630 | // it (this is just for efficiency; other positions would also work | |
1631 | // correctly). | |
1632 | if (type1 == elfcpp::PT_TLS | |
1633 | && type2 != elfcpp::PT_TLS | |
1634 | && type2 != elfcpp::PT_GNU_RELRO) | |
1635 | return false; | |
1636 | if (type2 == elfcpp::PT_TLS | |
1637 | && type1 != elfcpp::PT_TLS | |
1638 | && type1 != elfcpp::PT_GNU_RELRO) | |
1639 | return true; | |
1640 | ||
1641 | // We put the PT_GNU_RELRO segment last, because that is where the | |
1642 | // dynamic linker expects to find it (as with PT_TLS, this is just | |
1643 | // for efficiency). | |
1644 | if (type1 == elfcpp::PT_GNU_RELRO && type2 != elfcpp::PT_GNU_RELRO) | |
92e059d8 | 1645 | return false; |
9f1d377b | 1646 | if (type2 == elfcpp::PT_GNU_RELRO && type1 != elfcpp::PT_GNU_RELRO) |
92e059d8 ILT |
1647 | return true; |
1648 | ||
75f65a3e ILT |
1649 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
1650 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
1651 | ||
1652 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
1653 | // by the numeric segment type and flags values. There should not | |
1654 | // be more than one segment with the same type and flags. | |
1655 | if (type1 != elfcpp::PT_LOAD) | |
1656 | { | |
1657 | if (type1 != type2) | |
1658 | return type1 < type2; | |
a3ad94ed | 1659 | gold_assert(flags1 != flags2); |
75f65a3e ILT |
1660 | return flags1 < flags2; |
1661 | } | |
1662 | ||
a445fddf ILT |
1663 | // If the addresses are set already, sort by load address. |
1664 | if (seg1->are_addresses_set()) | |
1665 | { | |
1666 | if (!seg2->are_addresses_set()) | |
1667 | return true; | |
1668 | ||
1669 | unsigned int section_count1 = seg1->output_section_count(); | |
1670 | unsigned int section_count2 = seg2->output_section_count(); | |
1671 | if (section_count1 == 0 && section_count2 > 0) | |
1672 | return true; | |
1673 | if (section_count1 > 0 && section_count2 == 0) | |
1674 | return false; | |
1675 | ||
1676 | uint64_t paddr1 = seg1->first_section_load_address(); | |
1677 | uint64_t paddr2 = seg2->first_section_load_address(); | |
1678 | if (paddr1 != paddr2) | |
1679 | return paddr1 < paddr2; | |
1680 | } | |
1681 | else if (seg2->are_addresses_set()) | |
1682 | return false; | |
1683 | ||
75f65a3e | 1684 | // We sort PT_LOAD segments based on the flags. Readonly segments |
756ac4a8 ILT |
1685 | // come before writable segments. Then writable segments with data |
1686 | // come before writable segments without data. Then executable | |
1687 | // segments come before non-executable segments. Then the unlikely | |
1688 | // case of a non-readable segment comes before the normal case of a | |
1689 | // readable segment. If there are multiple segments with the same | |
1690 | // type and flags, we require that the address be set, and we sort | |
1691 | // by virtual address and then physical address. | |
75f65a3e ILT |
1692 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) |
1693 | return (flags1 & elfcpp::PF_W) == 0; | |
756ac4a8 ILT |
1694 | if ((flags1 & elfcpp::PF_W) != 0 |
1695 | && seg1->has_any_data_sections() != seg2->has_any_data_sections()) | |
1696 | return seg1->has_any_data_sections(); | |
75f65a3e ILT |
1697 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) |
1698 | return (flags1 & elfcpp::PF_X) != 0; | |
1699 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
1700 | return (flags1 & elfcpp::PF_R) == 0; | |
1701 | ||
a445fddf ILT |
1702 | // We shouldn't get here--we shouldn't create segments which we |
1703 | // can't distinguish. | |
1704 | gold_unreachable(); | |
75f65a3e ILT |
1705 | } |
1706 | ||
ead1e424 ILT |
1707 | // Set the file offsets of all the segments, and all the sections they |
1708 | // contain. They have all been created. LOAD_SEG must be be laid out | |
1709 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
1710 | |
1711 | off_t | |
ead1e424 ILT |
1712 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
1713 | unsigned int *pshndx) | |
75f65a3e ILT |
1714 | { |
1715 | // Sort them into the final order. | |
54dc6425 ILT |
1716 | std::sort(this->segment_list_.begin(), this->segment_list_.end(), |
1717 | Layout::Compare_segments()); | |
1718 | ||
75f65a3e ILT |
1719 | // Find the PT_LOAD segments, and set their addresses and offsets |
1720 | // and their section's addresses and offsets. | |
0c5e9c22 | 1721 | uint64_t addr; |
45aa233b ILT |
1722 | if (this->options_.user_set_Ttext()) |
1723 | addr = this->options_.Ttext(); | |
8851ecca | 1724 | else if (parameters->options().shared()) |
a445fddf | 1725 | addr = 0; |
0c5e9c22 ILT |
1726 | else |
1727 | addr = target->default_text_segment_address(); | |
75f65a3e | 1728 | off_t off = 0; |
a445fddf ILT |
1729 | |
1730 | // If LOAD_SEG is NULL, then the file header and segment headers | |
1731 | // will not be loadable. But they still need to be at offset 0 in | |
1732 | // the file. Set their offsets now. | |
1733 | if (load_seg == NULL) | |
1734 | { | |
1735 | for (Data_list::iterator p = this->special_output_list_.begin(); | |
1736 | p != this->special_output_list_.end(); | |
1737 | ++p) | |
1738 | { | |
1739 | off = align_address(off, (*p)->addralign()); | |
1740 | (*p)->set_address_and_file_offset(0, off); | |
1741 | off += (*p)->data_size(); | |
1742 | } | |
1743 | } | |
1744 | ||
34810851 ILT |
1745 | const bool check_sections = parameters->options().check_sections(); |
1746 | Output_segment* last_load_segment = NULL; | |
1747 | ||
75f65a3e ILT |
1748 | bool was_readonly = false; |
1749 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
1750 | p != this->segment_list_.end(); | |
1751 | ++p) | |
1752 | { | |
1753 | if ((*p)->type() == elfcpp::PT_LOAD) | |
1754 | { | |
1755 | if (load_seg != NULL && load_seg != *p) | |
a3ad94ed | 1756 | gold_unreachable(); |
75f65a3e ILT |
1757 | load_seg = NULL; |
1758 | ||
756ac4a8 ILT |
1759 | bool are_addresses_set = (*p)->are_addresses_set(); |
1760 | if (are_addresses_set) | |
1761 | { | |
1762 | // When it comes to setting file offsets, we care about | |
1763 | // the physical address. | |
1764 | addr = (*p)->paddr(); | |
1765 | } | |
45aa233b | 1766 | else if (this->options_.user_set_Tdata() |
756ac4a8 | 1767 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
45aa233b | 1768 | && (!this->options_.user_set_Tbss() |
756ac4a8 ILT |
1769 | || (*p)->has_any_data_sections())) |
1770 | { | |
45aa233b | 1771 | addr = this->options_.Tdata(); |
756ac4a8 ILT |
1772 | are_addresses_set = true; |
1773 | } | |
45aa233b | 1774 | else if (this->options_.user_set_Tbss() |
756ac4a8 ILT |
1775 | && ((*p)->flags() & elfcpp::PF_W) != 0 |
1776 | && !(*p)->has_any_data_sections()) | |
1777 | { | |
45aa233b | 1778 | addr = this->options_.Tbss(); |
756ac4a8 ILT |
1779 | are_addresses_set = true; |
1780 | } | |
1781 | ||
75f65a3e ILT |
1782 | uint64_t orig_addr = addr; |
1783 | uint64_t orig_off = off; | |
1784 | ||
a445fddf | 1785 | uint64_t aligned_addr = 0; |
75f65a3e | 1786 | uint64_t abi_pagesize = target->abi_pagesize(); |
af6156ef | 1787 | uint64_t common_pagesize = target->common_pagesize(); |
0496d5e5 | 1788 | |
af6156ef ILT |
1789 | if (!parameters->options().nmagic() |
1790 | && !parameters->options().omagic()) | |
1791 | (*p)->set_minimum_p_align(common_pagesize); | |
0496d5e5 | 1792 | |
a445fddf | 1793 | if (are_addresses_set) |
75f65a3e | 1794 | { |
af6156ef ILT |
1795 | if (!parameters->options().nmagic() |
1796 | && !parameters->options().omagic()) | |
1797 | { | |
1798 | // Adjust the file offset to the same address modulo | |
1799 | // the page size. | |
1800 | uint64_t unsigned_off = off; | |
1801 | uint64_t aligned_off = ((unsigned_off & ~(abi_pagesize - 1)) | |
1802 | | (addr & (abi_pagesize - 1))); | |
1803 | if (aligned_off < unsigned_off) | |
1804 | aligned_off += abi_pagesize; | |
1805 | off = aligned_off; | |
1806 | } | |
a445fddf ILT |
1807 | } |
1808 | else | |
1809 | { | |
1810 | // If the last segment was readonly, and this one is | |
1811 | // not, then skip the address forward one page, | |
1812 | // maintaining the same position within the page. This | |
1813 | // lets us store both segments overlapping on a single | |
1814 | // page in the file, but the loader will put them on | |
1815 | // different pages in memory. | |
1816 | ||
1817 | addr = align_address(addr, (*p)->maximum_alignment()); | |
75f65a3e | 1818 | aligned_addr = addr; |
a445fddf ILT |
1819 | |
1820 | if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0) | |
1821 | { | |
1822 | if ((addr & (abi_pagesize - 1)) != 0) | |
1823 | addr = addr + abi_pagesize; | |
1824 | } | |
1825 | ||
1826 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); | |
75f65a3e ILT |
1827 | } |
1828 | ||
ead1e424 | 1829 | unsigned int shndx_hold = *pshndx; |
96a2b4e4 ILT |
1830 | uint64_t new_addr = (*p)->set_section_addresses(this, false, addr, |
1831 | &off, pshndx); | |
75f65a3e ILT |
1832 | |
1833 | // Now that we know the size of this segment, we may be able | |
1834 | // to save a page in memory, at the cost of wasting some | |
1835 | // file space, by instead aligning to the start of a new | |
1836 | // page. Here we use the real machine page size rather than | |
1837 | // the ABI mandated page size. | |
1838 | ||
a445fddf | 1839 | if (!are_addresses_set && aligned_addr != addr) |
75f65a3e | 1840 | { |
75f65a3e ILT |
1841 | uint64_t first_off = (common_pagesize |
1842 | - (aligned_addr | |
1843 | & (common_pagesize - 1))); | |
1844 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
1845 | if (first_off > 0 | |
1846 | && last_off > 0 | |
1847 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
1848 | != (new_addr & ~ (common_pagesize - 1))) | |
1849 | && first_off + last_off <= common_pagesize) | |
1850 | { | |
ead1e424 ILT |
1851 | *pshndx = shndx_hold; |
1852 | addr = align_address(aligned_addr, common_pagesize); | |
a445fddf | 1853 | addr = align_address(addr, (*p)->maximum_alignment()); |
75f65a3e | 1854 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
96a2b4e4 ILT |
1855 | new_addr = (*p)->set_section_addresses(this, true, addr, |
1856 | &off, pshndx); | |
75f65a3e ILT |
1857 | } |
1858 | } | |
1859 | ||
1860 | addr = new_addr; | |
1861 | ||
1862 | if (((*p)->flags() & elfcpp::PF_W) == 0) | |
1863 | was_readonly = true; | |
34810851 ILT |
1864 | |
1865 | // Implement --check-sections. We know that the segments | |
1866 | // are sorted by LMA. | |
1867 | if (check_sections && last_load_segment != NULL) | |
1868 | { | |
1869 | gold_assert(last_load_segment->paddr() <= (*p)->paddr()); | |
1870 | if (last_load_segment->paddr() + last_load_segment->memsz() | |
1871 | > (*p)->paddr()) | |
1872 | { | |
1873 | unsigned long long lb1 = last_load_segment->paddr(); | |
1874 | unsigned long long le1 = lb1 + last_load_segment->memsz(); | |
1875 | unsigned long long lb2 = (*p)->paddr(); | |
1876 | unsigned long long le2 = lb2 + (*p)->memsz(); | |
1877 | gold_error(_("load segment overlap [0x%llx -> 0x%llx] and " | |
1878 | "[0x%llx -> 0x%llx]"), | |
1879 | lb1, le1, lb2, le2); | |
1880 | } | |
1881 | } | |
1882 | last_load_segment = *p; | |
75f65a3e ILT |
1883 | } |
1884 | } | |
1885 | ||
1886 | // Handle the non-PT_LOAD segments, setting their offsets from their | |
1887 | // section's offsets. | |
1888 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
1889 | p != this->segment_list_.end(); | |
1890 | ++p) | |
1891 | { | |
1892 | if ((*p)->type() != elfcpp::PT_LOAD) | |
1893 | (*p)->set_offset(); | |
1894 | } | |
1895 | ||
7bf1f802 ILT |
1896 | // Set the TLS offsets for each section in the PT_TLS segment. |
1897 | if (this->tls_segment_ != NULL) | |
1898 | this->tls_segment_->set_tls_offsets(); | |
1899 | ||
75f65a3e ILT |
1900 | return off; |
1901 | } | |
1902 | ||
6a74a719 ILT |
1903 | // Set the offsets of all the allocated sections when doing a |
1904 | // relocatable link. This does the same jobs as set_segment_offsets, | |
1905 | // only for a relocatable link. | |
1906 | ||
1907 | off_t | |
1908 | Layout::set_relocatable_section_offsets(Output_data* file_header, | |
1909 | unsigned int *pshndx) | |
1910 | { | |
1911 | off_t off = 0; | |
1912 | ||
1913 | file_header->set_address_and_file_offset(0, 0); | |
1914 | off += file_header->data_size(); | |
1915 | ||
1916 | for (Section_list::iterator p = this->section_list_.begin(); | |
1917 | p != this->section_list_.end(); | |
1918 | ++p) | |
1919 | { | |
1920 | // We skip unallocated sections here, except that group sections | |
1921 | // have to come first. | |
1922 | if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0 | |
1923 | && (*p)->type() != elfcpp::SHT_GROUP) | |
1924 | continue; | |
1925 | ||
1926 | off = align_address(off, (*p)->addralign()); | |
1927 | ||
1928 | // The linker script might have set the address. | |
1929 | if (!(*p)->is_address_valid()) | |
1930 | (*p)->set_address(0); | |
1931 | (*p)->set_file_offset(off); | |
1932 | (*p)->finalize_data_size(); | |
1933 | off += (*p)->data_size(); | |
1934 | ||
1935 | (*p)->set_out_shndx(*pshndx); | |
1936 | ++*pshndx; | |
1937 | } | |
1938 | ||
1939 | return off; | |
1940 | } | |
1941 | ||
75f65a3e ILT |
1942 | // Set the file offset of all the sections not associated with a |
1943 | // segment. | |
1944 | ||
1945 | off_t | |
9a0910c3 | 1946 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 1947 | { |
a3ad94ed ILT |
1948 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
1949 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
1950 | ++p) |
1951 | { | |
27bc2bce ILT |
1952 | // The symtab section is handled in create_symtab_sections. |
1953 | if (*p == this->symtab_section_) | |
61ba1cf9 | 1954 | continue; |
27bc2bce | 1955 | |
a9a60db6 ILT |
1956 | // If we've already set the data size, don't set it again. |
1957 | if ((*p)->is_offset_valid() && (*p)->is_data_size_valid()) | |
1958 | continue; | |
1959 | ||
96803768 ILT |
1960 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
1961 | && (*p)->requires_postprocessing()) | |
17a1d0a9 ILT |
1962 | { |
1963 | (*p)->create_postprocessing_buffer(); | |
1964 | this->any_postprocessing_sections_ = true; | |
1965 | } | |
96803768 | 1966 | |
9a0910c3 ILT |
1967 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
1968 | && (*p)->after_input_sections()) | |
1969 | continue; | |
17a1d0a9 | 1970 | else if (pass == POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
1971 | && (!(*p)->after_input_sections() |
1972 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
1973 | continue; | |
17a1d0a9 | 1974 | else if (pass == STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS |
9a0910c3 ILT |
1975 | && (!(*p)->after_input_sections() |
1976 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
1977 | continue; | |
27bc2bce | 1978 | |
ead1e424 | 1979 | off = align_address(off, (*p)->addralign()); |
27bc2bce ILT |
1980 | (*p)->set_file_offset(off); |
1981 | (*p)->finalize_data_size(); | |
75f65a3e | 1982 | off += (*p)->data_size(); |
96803768 ILT |
1983 | |
1984 | // At this point the name must be set. | |
17a1d0a9 | 1985 | if (pass != STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS) |
96803768 | 1986 | this->namepool_.add((*p)->name(), false, NULL); |
75f65a3e ILT |
1987 | } |
1988 | return off; | |
1989 | } | |
1990 | ||
86887060 ILT |
1991 | // Set the section indexes of all the sections not associated with a |
1992 | // segment. | |
1993 | ||
1994 | unsigned int | |
1995 | Layout::set_section_indexes(unsigned int shndx) | |
1996 | { | |
1997 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
1998 | p != this->unattached_section_list_.end(); | |
1999 | ++p) | |
2000 | { | |
d491d34e ILT |
2001 | if (!(*p)->has_out_shndx()) |
2002 | { | |
2003 | (*p)->set_out_shndx(shndx); | |
2004 | ++shndx; | |
2005 | } | |
86887060 ILT |
2006 | } |
2007 | return shndx; | |
2008 | } | |
2009 | ||
a445fddf ILT |
2010 | // Set the section addresses according to the linker script. This is |
2011 | // only called when we see a SECTIONS clause. This returns the | |
2012 | // program segment which should hold the file header and segment | |
2013 | // headers, if any. It will return NULL if they should not be in a | |
2014 | // segment. | |
2015 | ||
2016 | Output_segment* | |
2017 | Layout::set_section_addresses_from_script(Symbol_table* symtab) | |
2018 | { | |
2019 | Script_sections* ss = this->script_options_->script_sections(); | |
2020 | gold_assert(ss->saw_sections_clause()); | |
2021 | ||
2022 | // Place each orphaned output section in the script. | |
2023 | for (Section_list::iterator p = this->section_list_.begin(); | |
2024 | p != this->section_list_.end(); | |
2025 | ++p) | |
2026 | { | |
2027 | if (!(*p)->found_in_sections_clause()) | |
2028 | ss->place_orphan(*p); | |
2029 | } | |
2030 | ||
2031 | return this->script_options_->set_section_addresses(symtab, this); | |
2032 | } | |
2033 | ||
7bf1f802 ILT |
2034 | // Count the local symbols in the regular symbol table and the dynamic |
2035 | // symbol table, and build the respective string pools. | |
2036 | ||
2037 | void | |
17a1d0a9 ILT |
2038 | Layout::count_local_symbols(const Task* task, |
2039 | const Input_objects* input_objects) | |
7bf1f802 | 2040 | { |
6d013333 ILT |
2041 | // First, figure out an upper bound on the number of symbols we'll |
2042 | // be inserting into each pool. This helps us create the pools with | |
2043 | // the right size, to avoid unnecessary hashtable resizing. | |
2044 | unsigned int symbol_count = 0; | |
2045 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2046 | p != input_objects->relobj_end(); | |
2047 | ++p) | |
2048 | symbol_count += (*p)->local_symbol_count(); | |
2049 | ||
2050 | // Go from "upper bound" to "estimate." We overcount for two | |
2051 | // reasons: we double-count symbols that occur in more than one | |
2052 | // object file, and we count symbols that are dropped from the | |
2053 | // output. Add it all together and assume we overcount by 100%. | |
2054 | symbol_count /= 2; | |
2055 | ||
2056 | // We assume all symbols will go into both the sympool and dynpool. | |
2057 | this->sympool_.reserve(symbol_count); | |
2058 | this->dynpool_.reserve(symbol_count); | |
2059 | ||
7bf1f802 ILT |
2060 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2061 | p != input_objects->relobj_end(); | |
2062 | ++p) | |
2063 | { | |
17a1d0a9 | 2064 | Task_lock_obj<Object> tlo(task, *p); |
7bf1f802 ILT |
2065 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); |
2066 | } | |
2067 | } | |
2068 | ||
b8e6aad9 ILT |
2069 | // Create the symbol table sections. Here we also set the final |
2070 | // values of the symbols. At this point all the loadable sections are | |
d491d34e | 2071 | // fully laid out. SHNUM is the number of sections so far. |
75f65a3e ILT |
2072 | |
2073 | void | |
9025d29d | 2074 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 2075 | Symbol_table* symtab, |
d491d34e | 2076 | unsigned int shnum, |
16649710 | 2077 | off_t* poff) |
75f65a3e | 2078 | { |
61ba1cf9 ILT |
2079 | int symsize; |
2080 | unsigned int align; | |
8851ecca | 2081 | if (parameters->target().get_size() == 32) |
61ba1cf9 ILT |
2082 | { |
2083 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
2084 | align = 4; | |
2085 | } | |
8851ecca | 2086 | else if (parameters->target().get_size() == 64) |
61ba1cf9 ILT |
2087 | { |
2088 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
2089 | align = 8; | |
2090 | } | |
2091 | else | |
a3ad94ed | 2092 | gold_unreachable(); |
61ba1cf9 ILT |
2093 | |
2094 | off_t off = *poff; | |
ead1e424 | 2095 | off = align_address(off, align); |
61ba1cf9 ILT |
2096 | off_t startoff = off; |
2097 | ||
2098 | // Save space for the dummy symbol at the start of the section. We | |
2099 | // never bother to write this out--it will just be left as zero. | |
2100 | off += symsize; | |
c06b7b0b | 2101 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 2102 | |
a3ad94ed ILT |
2103 | // Add STT_SECTION symbols for each Output section which needs one. |
2104 | for (Section_list::iterator p = this->section_list_.begin(); | |
2105 | p != this->section_list_.end(); | |
2106 | ++p) | |
2107 | { | |
2108 | if (!(*p)->needs_symtab_index()) | |
2109 | (*p)->set_symtab_index(-1U); | |
2110 | else | |
2111 | { | |
2112 | (*p)->set_symtab_index(local_symbol_index); | |
2113 | ++local_symbol_index; | |
2114 | off += symsize; | |
2115 | } | |
2116 | } | |
2117 | ||
f6ce93d6 ILT |
2118 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
2119 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
2120 | ++p) |
2121 | { | |
c06b7b0b | 2122 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
7bf1f802 | 2123 | off); |
c06b7b0b ILT |
2124 | off += (index - local_symbol_index) * symsize; |
2125 | local_symbol_index = index; | |
75f65a3e ILT |
2126 | } |
2127 | ||
c06b7b0b | 2128 | unsigned int local_symcount = local_symbol_index; |
a3ad94ed | 2129 | gold_assert(local_symcount * symsize == off - startoff); |
61ba1cf9 | 2130 | |
16649710 ILT |
2131 | off_t dynoff; |
2132 | size_t dyn_global_index; | |
2133 | size_t dyncount; | |
2134 | if (this->dynsym_section_ == NULL) | |
2135 | { | |
2136 | dynoff = 0; | |
2137 | dyn_global_index = 0; | |
2138 | dyncount = 0; | |
2139 | } | |
2140 | else | |
2141 | { | |
2142 | dyn_global_index = this->dynsym_section_->info(); | |
2143 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); | |
2144 | dynoff = this->dynsym_section_->offset() + locsize; | |
2145 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 2146 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
2147 | == this->dynsym_section_->data_size() - locsize); |
2148 | } | |
2149 | ||
55a93433 ILT |
2150 | off = symtab->finalize(off, dynoff, dyn_global_index, dyncount, |
2151 | &this->sympool_, &local_symcount); | |
75f65a3e | 2152 | |
8851ecca | 2153 | if (!parameters->options().strip_all()) |
9e2dcb77 ILT |
2154 | { |
2155 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 2156 | |
cfd73a4e | 2157 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
2158 | Output_section* osymtab = this->make_output_section(symtab_name, |
2159 | elfcpp::SHT_SYMTAB, | |
2160 | 0); | |
2161 | this->symtab_section_ = osymtab; | |
a3ad94ed | 2162 | |
27bc2bce | 2163 | Output_section_data* pos = new Output_data_fixed_space(off - startoff, |
7d9e3d98 ILT |
2164 | align, |
2165 | "** symtab"); | |
9e2dcb77 | 2166 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 2167 | |
d491d34e ILT |
2168 | // We generate a .symtab_shndx section if we have more than |
2169 | // SHN_LORESERVE sections. Technically it is possible that we | |
2170 | // don't need one, because it is possible that there are no | |
2171 | // symbols in any of sections with indexes larger than | |
2172 | // SHN_LORESERVE. That is probably unusual, though, and it is | |
2173 | // easier to always create one than to compute section indexes | |
2174 | // twice (once here, once when writing out the symbols). | |
2175 | if (shnum >= elfcpp::SHN_LORESERVE) | |
2176 | { | |
2177 | const char* symtab_xindex_name = this->namepool_.add(".symtab_shndx", | |
2178 | false, NULL); | |
2179 | Output_section* osymtab_xindex = | |
2180 | this->make_output_section(symtab_xindex_name, | |
2181 | elfcpp::SHT_SYMTAB_SHNDX, 0); | |
2182 | ||
2183 | size_t symcount = (off - startoff) / symsize; | |
2184 | this->symtab_xindex_ = new Output_symtab_xindex(symcount); | |
2185 | ||
2186 | osymtab_xindex->add_output_section_data(this->symtab_xindex_); | |
2187 | ||
2188 | osymtab_xindex->set_link_section(osymtab); | |
2189 | osymtab_xindex->set_addralign(4); | |
2190 | osymtab_xindex->set_entsize(4); | |
2191 | ||
2192 | osymtab_xindex->set_after_input_sections(); | |
2193 | ||
2194 | // This tells the driver code to wait until the symbol table | |
2195 | // has written out before writing out the postprocessing | |
2196 | // sections, including the .symtab_shndx section. | |
2197 | this->any_postprocessing_sections_ = true; | |
2198 | } | |
2199 | ||
cfd73a4e | 2200 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
2201 | Output_section* ostrtab = this->make_output_section(strtab_name, |
2202 | elfcpp::SHT_STRTAB, | |
2203 | 0); | |
a3ad94ed | 2204 | |
9e2dcb77 ILT |
2205 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
2206 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 2207 | |
27bc2bce ILT |
2208 | osymtab->set_file_offset(startoff); |
2209 | osymtab->finalize_data_size(); | |
9e2dcb77 ILT |
2210 | osymtab->set_link_section(ostrtab); |
2211 | osymtab->set_info(local_symcount); | |
2212 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 2213 | |
9e2dcb77 ILT |
2214 | *poff = off; |
2215 | } | |
75f65a3e ILT |
2216 | } |
2217 | ||
2218 | // Create the .shstrtab section, which holds the names of the | |
2219 | // sections. At the time this is called, we have created all the | |
2220 | // output sections except .shstrtab itself. | |
2221 | ||
2222 | Output_section* | |
2223 | Layout::create_shstrtab() | |
2224 | { | |
2225 | // FIXME: We don't need to create a .shstrtab section if we are | |
2226 | // stripping everything. | |
2227 | ||
cfd73a4e | 2228 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 2229 | |
a3ad94ed | 2230 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0); |
75f65a3e | 2231 | |
27bc2bce ILT |
2232 | // We can't write out this section until we've set all the section |
2233 | // names, and we don't set the names of compressed output sections | |
2234 | // until relocations are complete. | |
2235 | os->set_after_input_sections(); | |
2236 | ||
a3ad94ed ILT |
2237 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
2238 | os->add_output_section_data(posd); | |
75f65a3e ILT |
2239 | |
2240 | return os; | |
2241 | } | |
2242 | ||
2243 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
2244 | // offset. | |
2245 | ||
27bc2bce | 2246 | void |
d491d34e | 2247 | Layout::create_shdrs(const Output_section* shstrtab_section, off_t* poff) |
75f65a3e ILT |
2248 | { |
2249 | Output_section_headers* oshdrs; | |
9025d29d | 2250 | oshdrs = new Output_section_headers(this, |
16649710 | 2251 | &this->segment_list_, |
6a74a719 | 2252 | &this->section_list_, |
16649710 | 2253 | &this->unattached_section_list_, |
d491d34e ILT |
2254 | &this->namepool_, |
2255 | shstrtab_section); | |
ead1e424 | 2256 | off_t off = align_address(*poff, oshdrs->addralign()); |
27bc2bce | 2257 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 ILT |
2258 | off += oshdrs->data_size(); |
2259 | *poff = off; | |
27bc2bce | 2260 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
2261 | } |
2262 | ||
d491d34e ILT |
2263 | // Count the allocated sections. |
2264 | ||
2265 | size_t | |
2266 | Layout::allocated_output_section_count() const | |
2267 | { | |
2268 | size_t section_count = 0; | |
2269 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
2270 | p != this->segment_list_.end(); | |
2271 | ++p) | |
2272 | section_count += (*p)->output_section_count(); | |
2273 | return section_count; | |
2274 | } | |
2275 | ||
dbe717ef ILT |
2276 | // Create the dynamic symbol table. |
2277 | ||
2278 | void | |
7bf1f802 | 2279 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
9b07f471 | 2280 | Symbol_table* symtab, |
14b31740 ILT |
2281 | Output_section **pdynstr, |
2282 | unsigned int* plocal_dynamic_count, | |
2283 | std::vector<Symbol*>* pdynamic_symbols, | |
2284 | Versions* pversions) | |
dbe717ef | 2285 | { |
a3ad94ed ILT |
2286 | // Count all the symbols in the dynamic symbol table, and set the |
2287 | // dynamic symbol indexes. | |
dbe717ef | 2288 | |
a3ad94ed ILT |
2289 | // Skip symbol 0, which is always all zeroes. |
2290 | unsigned int index = 1; | |
dbe717ef | 2291 | |
a3ad94ed ILT |
2292 | // Add STT_SECTION symbols for each Output section which needs one. |
2293 | for (Section_list::iterator p = this->section_list_.begin(); | |
2294 | p != this->section_list_.end(); | |
2295 | ++p) | |
2296 | { | |
2297 | if (!(*p)->needs_dynsym_index()) | |
2298 | (*p)->set_dynsym_index(-1U); | |
2299 | else | |
2300 | { | |
2301 | (*p)->set_dynsym_index(index); | |
2302 | ++index; | |
2303 | } | |
2304 | } | |
2305 | ||
7bf1f802 ILT |
2306 | // Count the local symbols that need to go in the dynamic symbol table, |
2307 | // and set the dynamic symbol indexes. | |
2308 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2309 | p != input_objects->relobj_end(); | |
2310 | ++p) | |
2311 | { | |
2312 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
2313 | index = new_index; | |
2314 | } | |
a3ad94ed ILT |
2315 | |
2316 | unsigned int local_symcount = index; | |
14b31740 | 2317 | *plocal_dynamic_count = local_symcount; |
a3ad94ed | 2318 | |
9b07f471 | 2319 | index = symtab->set_dynsym_indexes(index, pdynamic_symbols, |
35cdfc9a | 2320 | &this->dynpool_, pversions); |
a3ad94ed ILT |
2321 | |
2322 | int symsize; | |
2323 | unsigned int align; | |
8851ecca | 2324 | const int size = parameters->target().get_size(); |
a3ad94ed ILT |
2325 | if (size == 32) |
2326 | { | |
2327 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
2328 | align = 4; | |
2329 | } | |
2330 | else if (size == 64) | |
2331 | { | |
2332 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
2333 | align = 8; | |
2334 | } | |
2335 | else | |
2336 | gold_unreachable(); | |
2337 | ||
14b31740 ILT |
2338 | // Create the dynamic symbol table section. |
2339 | ||
3802b2dd ILT |
2340 | Output_section* dynsym = this->choose_output_section(NULL, ".dynsym", |
2341 | elfcpp::SHT_DYNSYM, | |
2342 | elfcpp::SHF_ALLOC, | |
2343 | false); | |
a3ad94ed | 2344 | |
27bc2bce | 2345 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, |
7d9e3d98 ILT |
2346 | align, |
2347 | "** dynsym"); | |
a3ad94ed ILT |
2348 | dynsym->add_output_section_data(odata); |
2349 | ||
2350 | dynsym->set_info(local_symcount); | |
2351 | dynsym->set_entsize(symsize); | |
2352 | dynsym->set_addralign(align); | |
2353 | ||
2354 | this->dynsym_section_ = dynsym; | |
2355 | ||
16649710 | 2356 | Output_data_dynamic* const odyn = this->dynamic_data_; |
a3ad94ed ILT |
2357 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); |
2358 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
2359 | ||
d491d34e ILT |
2360 | // If there are more than SHN_LORESERVE allocated sections, we |
2361 | // create a .dynsym_shndx section. It is possible that we don't | |
2362 | // need one, because it is possible that there are no dynamic | |
2363 | // symbols in any of the sections with indexes larger than | |
2364 | // SHN_LORESERVE. This is probably unusual, though, and at this | |
2365 | // time we don't know the actual section indexes so it is | |
2366 | // inconvenient to check. | |
2367 | if (this->allocated_output_section_count() >= elfcpp::SHN_LORESERVE) | |
2368 | { | |
2369 | Output_section* dynsym_xindex = | |
2370 | this->choose_output_section(NULL, ".dynsym_shndx", | |
2371 | elfcpp::SHT_SYMTAB_SHNDX, | |
2372 | elfcpp::SHF_ALLOC, | |
2373 | false); | |
2374 | ||
2375 | this->dynsym_xindex_ = new Output_symtab_xindex(index); | |
2376 | ||
2377 | dynsym_xindex->add_output_section_data(this->dynsym_xindex_); | |
2378 | ||
2379 | dynsym_xindex->set_link_section(dynsym); | |
2380 | dynsym_xindex->set_addralign(4); | |
2381 | dynsym_xindex->set_entsize(4); | |
2382 | ||
2383 | dynsym_xindex->set_after_input_sections(); | |
2384 | ||
2385 | // This tells the driver code to wait until the symbol table has | |
2386 | // written out before writing out the postprocessing sections, | |
2387 | // including the .dynsym_shndx section. | |
2388 | this->any_postprocessing_sections_ = true; | |
2389 | } | |
2390 | ||
14b31740 ILT |
2391 | // Create the dynamic string table section. |
2392 | ||
3802b2dd ILT |
2393 | Output_section* dynstr = this->choose_output_section(NULL, ".dynstr", |
2394 | elfcpp::SHT_STRTAB, | |
2395 | elfcpp::SHF_ALLOC, | |
2396 | false); | |
a3ad94ed ILT |
2397 | |
2398 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
2399 | dynstr->add_output_section_data(strdata); | |
2400 | ||
16649710 ILT |
2401 | dynsym->set_link_section(dynstr); |
2402 | this->dynamic_section_->set_link_section(dynstr); | |
2403 | ||
a3ad94ed ILT |
2404 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); |
2405 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
2406 | ||
14b31740 ILT |
2407 | *pdynstr = dynstr; |
2408 | ||
2409 | // Create the hash tables. | |
2410 | ||
13670ee6 ILT |
2411 | if (strcmp(parameters->options().hash_style(), "sysv") == 0 |
2412 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
2413 | { | |
2414 | unsigned char* phash; | |
2415 | unsigned int hashlen; | |
2416 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, | |
2417 | &phash, &hashlen); | |
2418 | ||
2419 | Output_section* hashsec = this->choose_output_section(NULL, ".hash", | |
2420 | elfcpp::SHT_HASH, | |
2421 | elfcpp::SHF_ALLOC, | |
2422 | false); | |
2423 | ||
2424 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
2425 | hashlen, | |
7d9e3d98 ILT |
2426 | align, |
2427 | "** hash"); | |
13670ee6 ILT |
2428 | hashsec->add_output_section_data(hashdata); |
2429 | ||
2430 | hashsec->set_link_section(dynsym); | |
2431 | hashsec->set_entsize(4); | |
a3ad94ed | 2432 | |
13670ee6 ILT |
2433 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); |
2434 | } | |
2435 | ||
2436 | if (strcmp(parameters->options().hash_style(), "gnu") == 0 | |
2437 | || strcmp(parameters->options().hash_style(), "both") == 0) | |
2438 | { | |
2439 | unsigned char* phash; | |
2440 | unsigned int hashlen; | |
2441 | Dynobj::create_gnu_hash_table(*pdynamic_symbols, local_symcount, | |
2442 | &phash, &hashlen); | |
a3ad94ed | 2443 | |
13670ee6 ILT |
2444 | Output_section* hashsec = this->choose_output_section(NULL, ".gnu.hash", |
2445 | elfcpp::SHT_GNU_HASH, | |
2446 | elfcpp::SHF_ALLOC, | |
2447 | false); | |
a3ad94ed | 2448 | |
13670ee6 ILT |
2449 | Output_section_data* hashdata = new Output_data_const_buffer(phash, |
2450 | hashlen, | |
7d9e3d98 ILT |
2451 | align, |
2452 | "** hash"); | |
13670ee6 | 2453 | hashsec->add_output_section_data(hashdata); |
a3ad94ed | 2454 | |
13670ee6 ILT |
2455 | hashsec->set_link_section(dynsym); |
2456 | hashsec->set_entsize(4); | |
a3ad94ed | 2457 | |
13670ee6 ILT |
2458 | odyn->add_section_address(elfcpp::DT_GNU_HASH, hashsec); |
2459 | } | |
dbe717ef ILT |
2460 | } |
2461 | ||
7bf1f802 ILT |
2462 | // Assign offsets to each local portion of the dynamic symbol table. |
2463 | ||
2464 | void | |
2465 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
2466 | { | |
2467 | Output_section* dynsym = this->dynsym_section_; | |
2468 | gold_assert(dynsym != NULL); | |
2469 | ||
2470 | off_t off = dynsym->offset(); | |
2471 | ||
2472 | // Skip the dummy symbol at the start of the section. | |
2473 | off += dynsym->entsize(); | |
2474 | ||
2475 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
2476 | p != input_objects->relobj_end(); | |
2477 | ++p) | |
2478 | { | |
2479 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
2480 | off += count * dynsym->entsize(); | |
2481 | } | |
2482 | } | |
2483 | ||
14b31740 ILT |
2484 | // Create the version sections. |
2485 | ||
2486 | void | |
9025d29d | 2487 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 2488 | const Symbol_table* symtab, |
14b31740 ILT |
2489 | unsigned int local_symcount, |
2490 | const std::vector<Symbol*>& dynamic_symbols, | |
2491 | const Output_section* dynstr) | |
2492 | { | |
2493 | if (!versions->any_defs() && !versions->any_needs()) | |
2494 | return; | |
2495 | ||
8851ecca | 2496 | switch (parameters->size_and_endianness()) |
14b31740 | 2497 | { |
193a53d9 | 2498 | #ifdef HAVE_TARGET_32_LITTLE |
8851ecca | 2499 | case Parameters::TARGET_32_LITTLE: |
7d1a9ebb ILT |
2500 | this->sized_create_version_sections<32, false>(versions, symtab, |
2501 | local_symcount, | |
2502 | dynamic_symbols, dynstr); | |
8851ecca | 2503 | break; |
193a53d9 | 2504 | #endif |
8851ecca ILT |
2505 | #ifdef HAVE_TARGET_32_BIG |
2506 | case Parameters::TARGET_32_BIG: | |
7d1a9ebb ILT |
2507 | this->sized_create_version_sections<32, true>(versions, symtab, |
2508 | local_symcount, | |
2509 | dynamic_symbols, dynstr); | |
8851ecca | 2510 | break; |
193a53d9 | 2511 | #endif |
193a53d9 | 2512 | #ifdef HAVE_TARGET_64_LITTLE |
8851ecca | 2513 | case Parameters::TARGET_64_LITTLE: |
7d1a9ebb ILT |
2514 | this->sized_create_version_sections<64, false>(versions, symtab, |
2515 | local_symcount, | |
2516 | dynamic_symbols, dynstr); | |
8851ecca | 2517 | break; |
193a53d9 | 2518 | #endif |
8851ecca ILT |
2519 | #ifdef HAVE_TARGET_64_BIG |
2520 | case Parameters::TARGET_64_BIG: | |
7d1a9ebb ILT |
2521 | this->sized_create_version_sections<64, true>(versions, symtab, |
2522 | local_symcount, | |
2523 | dynamic_symbols, dynstr); | |
8851ecca ILT |
2524 | break; |
2525 | #endif | |
2526 | default: | |
2527 | gold_unreachable(); | |
14b31740 | 2528 | } |
14b31740 ILT |
2529 | } |
2530 | ||
2531 | // Create the version sections, sized version. | |
2532 | ||
2533 | template<int size, bool big_endian> | |
2534 | void | |
2535 | Layout::sized_create_version_sections( | |
2536 | const Versions* versions, | |
46fe1623 | 2537 | const Symbol_table* symtab, |
14b31740 ILT |
2538 | unsigned int local_symcount, |
2539 | const std::vector<Symbol*>& dynamic_symbols, | |
7d1a9ebb | 2540 | const Output_section* dynstr) |
14b31740 | 2541 | { |
3802b2dd ILT |
2542 | Output_section* vsec = this->choose_output_section(NULL, ".gnu.version", |
2543 | elfcpp::SHT_GNU_versym, | |
2544 | elfcpp::SHF_ALLOC, | |
2545 | false); | |
14b31740 ILT |
2546 | |
2547 | unsigned char* vbuf; | |
2548 | unsigned int vsize; | |
7d1a9ebb ILT |
2549 | versions->symbol_section_contents<size, big_endian>(symtab, &this->dynpool_, |
2550 | local_symcount, | |
2551 | dynamic_symbols, | |
2552 | &vbuf, &vsize); | |
14b31740 | 2553 | |
7d9e3d98 ILT |
2554 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2, |
2555 | "** versions"); | |
14b31740 ILT |
2556 | |
2557 | vsec->add_output_section_data(vdata); | |
2558 | vsec->set_entsize(2); | |
2559 | vsec->set_link_section(this->dynsym_section_); | |
2560 | ||
2561 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
2562 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
2563 | ||
2564 | if (versions->any_defs()) | |
2565 | { | |
3802b2dd ILT |
2566 | Output_section* vdsec; |
2567 | vdsec= this->choose_output_section(NULL, ".gnu.version_d", | |
2568 | elfcpp::SHT_GNU_verdef, | |
2569 | elfcpp::SHF_ALLOC, | |
2570 | false); | |
14b31740 ILT |
2571 | |
2572 | unsigned char* vdbuf; | |
2573 | unsigned int vdsize; | |
2574 | unsigned int vdentries; | |
7d1a9ebb ILT |
2575 | versions->def_section_contents<size, big_endian>(&this->dynpool_, &vdbuf, |
2576 | &vdsize, &vdentries); | |
14b31740 | 2577 | |
7d9e3d98 ILT |
2578 | Output_section_data* vddata = |
2579 | new Output_data_const_buffer(vdbuf, vdsize, 4, "** version defs"); | |
14b31740 ILT |
2580 | |
2581 | vdsec->add_output_section_data(vddata); | |
2582 | vdsec->set_link_section(dynstr); | |
2583 | vdsec->set_info(vdentries); | |
2584 | ||
2585 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
2586 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
2587 | } | |
2588 | ||
2589 | if (versions->any_needs()) | |
2590 | { | |
14b31740 | 2591 | Output_section* vnsec; |
3802b2dd ILT |
2592 | vnsec = this->choose_output_section(NULL, ".gnu.version_r", |
2593 | elfcpp::SHT_GNU_verneed, | |
2594 | elfcpp::SHF_ALLOC, | |
2595 | false); | |
14b31740 ILT |
2596 | |
2597 | unsigned char* vnbuf; | |
2598 | unsigned int vnsize; | |
2599 | unsigned int vnentries; | |
7d1a9ebb ILT |
2600 | versions->need_section_contents<size, big_endian>(&this->dynpool_, |
2601 | &vnbuf, &vnsize, | |
2602 | &vnentries); | |
14b31740 | 2603 | |
7d9e3d98 ILT |
2604 | Output_section_data* vndata = |
2605 | new Output_data_const_buffer(vnbuf, vnsize, 4, "** version refs"); | |
14b31740 ILT |
2606 | |
2607 | vnsec->add_output_section_data(vndata); | |
2608 | vnsec->set_link_section(dynstr); | |
2609 | vnsec->set_info(vnentries); | |
2610 | ||
2611 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
2612 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
2613 | } | |
2614 | } | |
2615 | ||
dbe717ef ILT |
2616 | // Create the .interp section and PT_INTERP segment. |
2617 | ||
2618 | void | |
2619 | Layout::create_interp(const Target* target) | |
2620 | { | |
2621 | const char* interp = this->options_.dynamic_linker(); | |
2622 | if (interp == NULL) | |
2623 | { | |
2624 | interp = target->dynamic_linker(); | |
a3ad94ed | 2625 | gold_assert(interp != NULL); |
dbe717ef ILT |
2626 | } |
2627 | ||
2628 | size_t len = strlen(interp) + 1; | |
2629 | ||
2630 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
2631 | ||
3802b2dd ILT |
2632 | Output_section* osec = this->choose_output_section(NULL, ".interp", |
2633 | elfcpp::SHT_PROGBITS, | |
2634 | elfcpp::SHF_ALLOC, | |
2635 | false); | |
dbe717ef ILT |
2636 | osec->add_output_section_data(odata); |
2637 | ||
1c4f3631 ILT |
2638 | if (!this->script_options_->saw_phdrs_clause()) |
2639 | { | |
2640 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_INTERP, | |
2641 | elfcpp::PF_R); | |
01676dcd | 2642 | oseg->add_output_section(osec, elfcpp::PF_R); |
1c4f3631 | 2643 | } |
dbe717ef ILT |
2644 | } |
2645 | ||
a3ad94ed ILT |
2646 | // Finish the .dynamic section and PT_DYNAMIC segment. |
2647 | ||
2648 | void | |
2649 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 2650 | const Symbol_table* symtab) |
a3ad94ed | 2651 | { |
1c4f3631 ILT |
2652 | if (!this->script_options_->saw_phdrs_clause()) |
2653 | { | |
2654 | Output_segment* oseg = this->make_output_segment(elfcpp::PT_DYNAMIC, | |
2655 | (elfcpp::PF_R | |
2656 | | elfcpp::PF_W)); | |
01676dcd ILT |
2657 | oseg->add_output_section(this->dynamic_section_, |
2658 | elfcpp::PF_R | elfcpp::PF_W); | |
1c4f3631 | 2659 | } |
a3ad94ed | 2660 | |
16649710 ILT |
2661 | Output_data_dynamic* const odyn = this->dynamic_data_; |
2662 | ||
a3ad94ed ILT |
2663 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
2664 | p != input_objects->dynobj_end(); | |
2665 | ++p) | |
2666 | { | |
2667 | // FIXME: Handle --as-needed. | |
2668 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); | |
2669 | } | |
2670 | ||
8851ecca | 2671 | if (parameters->options().shared()) |
fced7afd ILT |
2672 | { |
2673 | const char* soname = this->options_.soname(); | |
2674 | if (soname != NULL) | |
2675 | odyn->add_string(elfcpp::DT_SONAME, soname); | |
2676 | } | |
2677 | ||
a3ad94ed ILT |
2678 | // FIXME: Support --init and --fini. |
2679 | Symbol* sym = symtab->lookup("_init"); | |
14b31740 | 2680 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
2681 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
2682 | ||
2683 | sym = symtab->lookup("_fini"); | |
14b31740 | 2684 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
2685 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
2686 | ||
2687 | // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY. | |
41f542e7 ILT |
2688 | |
2689 | // Add a DT_RPATH entry if needed. | |
2690 | const General_options::Dir_list& rpath(this->options_.rpath()); | |
2691 | if (!rpath.empty()) | |
2692 | { | |
2693 | std::string rpath_val; | |
2694 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
2695 | p != rpath.end(); | |
2696 | ++p) | |
2697 | { | |
2698 | if (rpath_val.empty()) | |
ad2d6943 | 2699 | rpath_val = p->name(); |
41f542e7 ILT |
2700 | else |
2701 | { | |
2702 | // Eliminate duplicates. | |
2703 | General_options::Dir_list::const_iterator q; | |
2704 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 2705 | if (q->name() == p->name()) |
41f542e7 ILT |
2706 | break; |
2707 | if (q == p) | |
2708 | { | |
2709 | rpath_val += ':'; | |
ad2d6943 | 2710 | rpath_val += p->name(); |
41f542e7 ILT |
2711 | } |
2712 | } | |
2713 | } | |
2714 | ||
2715 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
7c414435 DM |
2716 | if (parameters->options().enable_new_dtags()) |
2717 | odyn->add_string(elfcpp::DT_RUNPATH, rpath_val); | |
41f542e7 | 2718 | } |
4f4c5f80 ILT |
2719 | |
2720 | // Look for text segments that have dynamic relocations. | |
2721 | bool have_textrel = false; | |
4e8fe71f | 2722 | if (!this->script_options_->saw_sections_clause()) |
4f4c5f80 | 2723 | { |
4e8fe71f ILT |
2724 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
2725 | p != this->segment_list_.end(); | |
2726 | ++p) | |
2727 | { | |
2728 | if (((*p)->flags() & elfcpp::PF_W) == 0 | |
2729 | && (*p)->dynamic_reloc_count() > 0) | |
2730 | { | |
2731 | have_textrel = true; | |
2732 | break; | |
2733 | } | |
2734 | } | |
2735 | } | |
2736 | else | |
2737 | { | |
2738 | // We don't know the section -> segment mapping, so we are | |
2739 | // conservative and just look for readonly sections with | |
2740 | // relocations. If those sections wind up in writable segments, | |
2741 | // then we have created an unnecessary DT_TEXTREL entry. | |
2742 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
2743 | p != this->section_list_.end(); | |
2744 | ++p) | |
2745 | { | |
2746 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0 | |
2747 | && ((*p)->flags() & elfcpp::SHF_WRITE) == 0 | |
2748 | && ((*p)->dynamic_reloc_count() > 0)) | |
2749 | { | |
2750 | have_textrel = true; | |
2751 | break; | |
2752 | } | |
2753 | } | |
4f4c5f80 ILT |
2754 | } |
2755 | ||
2756 | // Add a DT_FLAGS entry. We add it even if no flags are set so that | |
2757 | // post-link tools can easily modify these flags if desired. | |
2758 | unsigned int flags = 0; | |
2759 | if (have_textrel) | |
6a41d30b ILT |
2760 | { |
2761 | // Add a DT_TEXTREL for compatibility with older loaders. | |
2762 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
2763 | flags |= elfcpp::DF_TEXTREL; | |
2764 | } | |
8851ecca | 2765 | if (parameters->options().shared() && this->has_static_tls()) |
535890bb | 2766 | flags |= elfcpp::DF_STATIC_TLS; |
7be8330a CD |
2767 | if (parameters->options().origin()) |
2768 | flags |= elfcpp::DF_ORIGIN; | |
4f4c5f80 | 2769 | odyn->add_constant(elfcpp::DT_FLAGS, flags); |
7c414435 DM |
2770 | |
2771 | flags = 0; | |
2772 | if (parameters->options().initfirst()) | |
2773 | flags |= elfcpp::DF_1_INITFIRST; | |
2774 | if (parameters->options().interpose()) | |
2775 | flags |= elfcpp::DF_1_INTERPOSE; | |
2776 | if (parameters->options().loadfltr()) | |
2777 | flags |= elfcpp::DF_1_LOADFLTR; | |
2778 | if (parameters->options().nodefaultlib()) | |
2779 | flags |= elfcpp::DF_1_NODEFLIB; | |
2780 | if (parameters->options().nodelete()) | |
2781 | flags |= elfcpp::DF_1_NODELETE; | |
2782 | if (parameters->options().nodlopen()) | |
2783 | flags |= elfcpp::DF_1_NOOPEN; | |
2784 | if (parameters->options().nodump()) | |
2785 | flags |= elfcpp::DF_1_NODUMP; | |
2786 | if (!parameters->options().shared()) | |
2787 | flags &= ~(elfcpp::DF_1_INITFIRST | |
2788 | | elfcpp::DF_1_NODELETE | |
2789 | | elfcpp::DF_1_NOOPEN); | |
7be8330a CD |
2790 | if (parameters->options().origin()) |
2791 | flags |= elfcpp::DF_1_ORIGIN; | |
7c414435 DM |
2792 | if (flags) |
2793 | odyn->add_constant(elfcpp::DT_FLAGS_1, flags); | |
a3ad94ed ILT |
2794 | } |
2795 | ||
a2fb1b05 ILT |
2796 | // The mapping of .gnu.linkonce section names to real section names. |
2797 | ||
ead1e424 | 2798 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
a2fb1b05 ILT |
2799 | const Layout::Linkonce_mapping Layout::linkonce_mapping[] = |
2800 | { | |
9f1d377b ILT |
2801 | MAPPING_INIT("d.rel.ro.local", ".data.rel.ro.local"), // Before "d.rel.ro". |
2802 | MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Before "d". | |
a2fb1b05 ILT |
2803 | MAPPING_INIT("t", ".text"), |
2804 | MAPPING_INIT("r", ".rodata"), | |
2805 | MAPPING_INIT("d", ".data"), | |
2806 | MAPPING_INIT("b", ".bss"), | |
2807 | MAPPING_INIT("s", ".sdata"), | |
2808 | MAPPING_INIT("sb", ".sbss"), | |
2809 | MAPPING_INIT("s2", ".sdata2"), | |
2810 | MAPPING_INIT("sb2", ".sbss2"), | |
2811 | MAPPING_INIT("wi", ".debug_info"), | |
2812 | MAPPING_INIT("td", ".tdata"), | |
2813 | MAPPING_INIT("tb", ".tbss"), | |
2814 | MAPPING_INIT("lr", ".lrodata"), | |
2815 | MAPPING_INIT("l", ".ldata"), | |
2816 | MAPPING_INIT("lb", ".lbss"), | |
2817 | }; | |
2818 | #undef MAPPING_INIT | |
2819 | ||
2820 | const int Layout::linkonce_mapping_count = | |
2821 | sizeof(Layout::linkonce_mapping) / sizeof(Layout::linkonce_mapping[0]); | |
2822 | ||
2823 | // Return the name of the output section to use for a .gnu.linkonce | |
2824 | // section. This is based on the default ELF linker script of the old | |
2825 | // GNU linker. For example, we map a name like ".gnu.linkonce.t.foo" | |
ead1e424 ILT |
2826 | // to ".text". Set *PLEN to the length of the name. *PLEN is |
2827 | // initialized to the length of NAME. | |
a2fb1b05 ILT |
2828 | |
2829 | const char* | |
ead1e424 | 2830 | Layout::linkonce_output_name(const char* name, size_t *plen) |
a2fb1b05 ILT |
2831 | { |
2832 | const char* s = name + sizeof(".gnu.linkonce") - 1; | |
2833 | if (*s != '.') | |
2834 | return name; | |
2835 | ++s; | |
2836 | const Linkonce_mapping* plm = linkonce_mapping; | |
2837 | for (int i = 0; i < linkonce_mapping_count; ++i, ++plm) | |
2838 | { | |
2839 | if (strncmp(s, plm->from, plm->fromlen) == 0 && s[plm->fromlen] == '.') | |
ead1e424 ILT |
2840 | { |
2841 | *plen = plm->tolen; | |
2842 | return plm->to; | |
2843 | } | |
a2fb1b05 ILT |
2844 | } |
2845 | return name; | |
2846 | } | |
2847 | ||
ead1e424 ILT |
2848 | // Choose the output section name to use given an input section name. |
2849 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
2850 | // length of NAME. | |
2851 | ||
2852 | const char* | |
2853 | Layout::output_section_name(const char* name, size_t* plen) | |
2854 | { | |
2855 | if (Layout::is_linkonce(name)) | |
2856 | { | |
2857 | // .gnu.linkonce sections are laid out as though they were named | |
2858 | // for the sections are placed into. | |
2859 | return Layout::linkonce_output_name(name, plen); | |
2860 | } | |
2861 | ||
af4a8a83 ILT |
2862 | // gcc 4.3 generates the following sorts of section names when it |
2863 | // needs a section name specific to a function: | |
2864 | // .text.FN | |
2865 | // .rodata.FN | |
2866 | // .sdata2.FN | |
2867 | // .data.FN | |
2868 | // .data.rel.FN | |
2869 | // .data.rel.local.FN | |
2870 | // .data.rel.ro.FN | |
2871 | // .data.rel.ro.local.FN | |
2872 | // .sdata.FN | |
2873 | // .bss.FN | |
2874 | // .sbss.FN | |
2875 | // .tdata.FN | |
2876 | // .tbss.FN | |
2877 | ||
2878 | // The GNU linker maps all of those to the part before the .FN, | |
2879 | // except that .data.rel.local.FN is mapped to .data, and | |
2880 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
2881 | // beginning with .data.rel.ro.local are grouped together. | |
2882 | ||
2883 | // For an anonymous namespace, the string FN can contain a '.'. | |
2884 | ||
2885 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
2886 | // GNU linker maps to .rodata. | |
2887 | ||
2888 | // The .data.rel.ro sections enable a security feature triggered by | |
2889 | // the -z relro option. Section which need to be relocated at | |
2890 | // program startup time but which may be readonly after startup are | |
2891 | // grouped into .data.rel.ro. They are then put into a PT_GNU_RELRO | |
2892 | // segment. The dynamic linker will make that segment writable, | |
2893 | // perform relocations, and then make it read-only. FIXME: We do | |
2894 | // not yet implement this optimization. | |
2895 | ||
2896 | // It is hard to handle this in a principled way. | |
2897 | ||
2898 | // These are the rules we follow: | |
2899 | ||
2900 | // If the section name has no initial '.', or no dot other than an | |
2901 | // initial '.', we use the name unchanged (i.e., "mysection" and | |
2902 | // ".text" are unchanged). | |
2903 | ||
9f1d377b ILT |
2904 | // If the name starts with ".data.rel.ro.local" we use |
2905 | // ".data.rel.ro.local". | |
2906 | ||
af4a8a83 ILT |
2907 | // If the name starts with ".data.rel.ro" we use ".data.rel.ro". |
2908 | ||
2909 | // Otherwise, we drop the second '.' and everything that comes after | |
2910 | // it (i.e., ".text.XXX" becomes ".text"). | |
ead1e424 ILT |
2911 | |
2912 | const char* s = name; | |
af4a8a83 ILT |
2913 | if (*s != '.') |
2914 | return name; | |
2915 | ++s; | |
ead1e424 ILT |
2916 | const char* sdot = strchr(s, '.'); |
2917 | if (sdot == NULL) | |
2918 | return name; | |
2919 | ||
9f1d377b ILT |
2920 | const char* const data_rel_ro_local = ".data.rel.ro.local"; |
2921 | if (strncmp(name, data_rel_ro_local, strlen(data_rel_ro_local)) == 0) | |
2922 | { | |
2923 | *plen = strlen(data_rel_ro_local); | |
2924 | return data_rel_ro_local; | |
2925 | } | |
2926 | ||
af4a8a83 ILT |
2927 | const char* const data_rel_ro = ".data.rel.ro"; |
2928 | if (strncmp(name, data_rel_ro, strlen(data_rel_ro)) == 0) | |
ead1e424 | 2929 | { |
af4a8a83 ILT |
2930 | *plen = strlen(data_rel_ro); |
2931 | return data_rel_ro; | |
ead1e424 ILT |
2932 | } |
2933 | ||
ead1e424 ILT |
2934 | *plen = sdot - name; |
2935 | return name; | |
2936 | } | |
2937 | ||
a2fb1b05 ILT |
2938 | // Record the signature of a comdat section, and return whether to |
2939 | // include it in the link. If GROUP is true, this is a regular | |
2940 | // section group. If GROUP is false, this is a group signature | |
2941 | // derived from the name of a linkonce section. We want linkonce | |
2942 | // signatures and group signatures to block each other, but we don't | |
2943 | // want a linkonce signature to block another linkonce signature. | |
2944 | ||
2945 | bool | |
e94cf127 CC |
2946 | Layout::add_comdat(Relobj* object, unsigned int shndx, |
2947 | const std::string& signature, bool group) | |
a2fb1b05 | 2948 | { |
e94cf127 | 2949 | Kept_section kept(object, shndx, group); |
a2fb1b05 | 2950 | std::pair<Signatures::iterator, bool> ins( |
e94cf127 | 2951 | this->signatures_.insert(std::make_pair(signature, kept))); |
a2fb1b05 ILT |
2952 | |
2953 | if (ins.second) | |
2954 | { | |
2955 | // This is the first time we've seen this signature. | |
2956 | return true; | |
2957 | } | |
2958 | ||
e94cf127 | 2959 | if (ins.first->second.group_) |
a2fb1b05 ILT |
2960 | { |
2961 | // We've already seen a real section group with this signature. | |
2962 | return false; | |
2963 | } | |
2964 | else if (group) | |
2965 | { | |
2966 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 2967 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 | 2968 | // a section group, and don't include this section group. |
e94cf127 | 2969 | ins.first->second.group_ = true; |
a2fb1b05 ILT |
2970 | return false; |
2971 | } | |
2972 | else | |
2973 | { | |
2974 | // We've already seen a linkonce section and this is a linkonce | |
2975 | // section. These don't block each other--this may be the same | |
2976 | // symbol name with different section types. | |
2977 | return true; | |
2978 | } | |
2979 | } | |
2980 | ||
e94cf127 CC |
2981 | // Find the given comdat signature, and return the object and section |
2982 | // index of the kept group. | |
2983 | Relobj* | |
2984 | Layout::find_kept_object(const std::string& signature, | |
2985 | unsigned int* pshndx) const | |
2986 | { | |
2987 | Signatures::const_iterator p = this->signatures_.find(signature); | |
2988 | if (p == this->signatures_.end()) | |
2989 | return NULL; | |
2990 | if (pshndx != NULL) | |
2991 | *pshndx = p->second.shndx_; | |
2992 | return p->second.object_; | |
2993 | } | |
2994 | ||
a445fddf ILT |
2995 | // Store the allocated sections into the section list. |
2996 | ||
2997 | void | |
2998 | Layout::get_allocated_sections(Section_list* section_list) const | |
2999 | { | |
3000 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3001 | p != this->section_list_.end(); | |
3002 | ++p) | |
3003 | if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0) | |
3004 | section_list->push_back(*p); | |
3005 | } | |
3006 | ||
3007 | // Create an output segment. | |
3008 | ||
3009 | Output_segment* | |
3010 | Layout::make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
3011 | { | |
8851ecca | 3012 | gold_assert(!parameters->options().relocatable()); |
a445fddf ILT |
3013 | Output_segment* oseg = new Output_segment(type, flags); |
3014 | this->segment_list_.push_back(oseg); | |
2d924fd9 ILT |
3015 | |
3016 | if (type == elfcpp::PT_TLS) | |
3017 | this->tls_segment_ = oseg; | |
3018 | else if (type == elfcpp::PT_GNU_RELRO) | |
3019 | this->relro_segment_ = oseg; | |
3020 | ||
a445fddf ILT |
3021 | return oseg; |
3022 | } | |
3023 | ||
730cdc88 ILT |
3024 | // Write out the Output_sections. Most won't have anything to write, |
3025 | // since most of the data will come from input sections which are | |
3026 | // handled elsewhere. But some Output_sections do have Output_data. | |
3027 | ||
3028 | void | |
3029 | Layout::write_output_sections(Output_file* of) const | |
3030 | { | |
3031 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3032 | p != this->section_list_.end(); | |
3033 | ++p) | |
3034 | { | |
3035 | if (!(*p)->after_input_sections()) | |
3036 | (*p)->write(of); | |
3037 | } | |
3038 | } | |
3039 | ||
61ba1cf9 ILT |
3040 | // Write out data not associated with a section or the symbol table. |
3041 | ||
3042 | void | |
9025d29d | 3043 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 3044 | { |
8851ecca | 3045 | if (!parameters->options().strip_all()) |
a3ad94ed | 3046 | { |
9e2dcb77 ILT |
3047 | const Output_section* symtab_section = this->symtab_section_; |
3048 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3049 | p != this->section_list_.end(); | |
3050 | ++p) | |
a3ad94ed | 3051 | { |
9e2dcb77 ILT |
3052 | if ((*p)->needs_symtab_index()) |
3053 | { | |
3054 | gold_assert(symtab_section != NULL); | |
3055 | unsigned int index = (*p)->symtab_index(); | |
3056 | gold_assert(index > 0 && index != -1U); | |
3057 | off_t off = (symtab_section->offset() | |
3058 | + index * symtab_section->entsize()); | |
d491d34e | 3059 | symtab->write_section_symbol(*p, this->symtab_xindex_, of, off); |
9e2dcb77 | 3060 | } |
a3ad94ed ILT |
3061 | } |
3062 | } | |
3063 | ||
3064 | const Output_section* dynsym_section = this->dynsym_section_; | |
3065 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3066 | p != this->section_list_.end(); | |
3067 | ++p) | |
3068 | { | |
3069 | if ((*p)->needs_dynsym_index()) | |
3070 | { | |
3071 | gold_assert(dynsym_section != NULL); | |
3072 | unsigned int index = (*p)->dynsym_index(); | |
3073 | gold_assert(index > 0 && index != -1U); | |
3074 | off_t off = (dynsym_section->offset() | |
3075 | + index * dynsym_section->entsize()); | |
d491d34e | 3076 | symtab->write_section_symbol(*p, this->dynsym_xindex_, of, off); |
a3ad94ed ILT |
3077 | } |
3078 | } | |
3079 | ||
a3ad94ed | 3080 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
3081 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
3082 | p != this->special_output_list_.end(); | |
3083 | ++p) | |
3084 | (*p)->write(of); | |
3085 | } | |
3086 | ||
730cdc88 ILT |
3087 | // Write out the Output_sections which can only be written after the |
3088 | // input sections are complete. | |
3089 | ||
3090 | void | |
27bc2bce | 3091 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 3092 | { |
27bc2bce | 3093 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
3094 | // file size. Note we finalize the .shstrab last, to allow the |
3095 | // after_input_section sections to modify their section-names before | |
3096 | // writing. | |
17a1d0a9 | 3097 | if (this->any_postprocessing_sections_) |
27bc2bce | 3098 | { |
17a1d0a9 ILT |
3099 | off_t off = this->output_file_size_; |
3100 | off = this->set_section_offsets(off, POSTPROCESSING_SECTIONS_PASS); | |
3101 | ||
3102 | // Now that we've finalized the names, we can finalize the shstrab. | |
3103 | off = | |
3104 | this->set_section_offsets(off, | |
3105 | STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS); | |
3106 | ||
3107 | if (off > this->output_file_size_) | |
3108 | { | |
3109 | of->resize(off); | |
3110 | this->output_file_size_ = off; | |
3111 | } | |
27bc2bce ILT |
3112 | } |
3113 | ||
730cdc88 ILT |
3114 | for (Section_list::const_iterator p = this->section_list_.begin(); |
3115 | p != this->section_list_.end(); | |
3116 | ++p) | |
3117 | { | |
3118 | if ((*p)->after_input_sections()) | |
3119 | (*p)->write(of); | |
3120 | } | |
27bc2bce | 3121 | |
27bc2bce | 3122 | this->section_headers_->write(of); |
730cdc88 ILT |
3123 | } |
3124 | ||
8ed814a9 ILT |
3125 | // If the build ID requires computing a checksum, do so here, and |
3126 | // write it out. We compute a checksum over the entire file because | |
3127 | // that is simplest. | |
3128 | ||
3129 | void | |
3130 | Layout::write_build_id(Output_file* of) const | |
3131 | { | |
3132 | if (this->build_id_note_ == NULL) | |
3133 | return; | |
3134 | ||
3135 | const unsigned char* iv = of->get_input_view(0, this->output_file_size_); | |
3136 | ||
3137 | unsigned char* ov = of->get_output_view(this->build_id_note_->offset(), | |
3138 | this->build_id_note_->data_size()); | |
3139 | ||
3140 | const char* style = parameters->options().build_id(); | |
3141 | if (strcmp(style, "sha1") == 0) | |
3142 | { | |
3143 | sha1_ctx ctx; | |
3144 | sha1_init_ctx(&ctx); | |
3145 | sha1_process_bytes(iv, this->output_file_size_, &ctx); | |
3146 | sha1_finish_ctx(&ctx, ov); | |
3147 | } | |
3148 | else if (strcmp(style, "md5") == 0) | |
3149 | { | |
3150 | md5_ctx ctx; | |
3151 | md5_init_ctx(&ctx); | |
3152 | md5_process_bytes(iv, this->output_file_size_, &ctx); | |
3153 | md5_finish_ctx(&ctx, ov); | |
3154 | } | |
3155 | else | |
3156 | gold_unreachable(); | |
3157 | ||
3158 | of->write_output_view(this->build_id_note_->offset(), | |
3159 | this->build_id_note_->data_size(), | |
3160 | ov); | |
3161 | ||
3162 | of->free_input_view(0, this->output_file_size_, iv); | |
3163 | } | |
3164 | ||
516cb3d0 ILT |
3165 | // Write out a binary file. This is called after the link is |
3166 | // complete. IN is the temporary output file we used to generate the | |
3167 | // ELF code. We simply walk through the segments, read them from | |
3168 | // their file offset in IN, and write them to their load address in | |
3169 | // the output file. FIXME: with a bit more work, we could support | |
3170 | // S-records and/or Intel hex format here. | |
3171 | ||
3172 | void | |
3173 | Layout::write_binary(Output_file* in) const | |
3174 | { | |
7cc619c3 | 3175 | gold_assert(this->options_.oformat_enum() |
bc644c6c | 3176 | == General_options::OBJECT_FORMAT_BINARY); |
516cb3d0 ILT |
3177 | |
3178 | // Get the size of the binary file. | |
3179 | uint64_t max_load_address = 0; | |
3180 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3181 | p != this->segment_list_.end(); | |
3182 | ++p) | |
3183 | { | |
3184 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
3185 | { | |
3186 | uint64_t max_paddr = (*p)->paddr() + (*p)->filesz(); | |
3187 | if (max_paddr > max_load_address) | |
3188 | max_load_address = max_paddr; | |
3189 | } | |
3190 | } | |
3191 | ||
8851ecca | 3192 | Output_file out(parameters->options().output_file_name()); |
516cb3d0 ILT |
3193 | out.open(max_load_address); |
3194 | ||
3195 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3196 | p != this->segment_list_.end(); | |
3197 | ++p) | |
3198 | { | |
3199 | if ((*p)->type() == elfcpp::PT_LOAD && (*p)->filesz() > 0) | |
3200 | { | |
3201 | const unsigned char* vin = in->get_input_view((*p)->offset(), | |
3202 | (*p)->filesz()); | |
3203 | unsigned char* vout = out.get_output_view((*p)->paddr(), | |
3204 | (*p)->filesz()); | |
3205 | memcpy(vout, vin, (*p)->filesz()); | |
3206 | out.write_output_view((*p)->paddr(), (*p)->filesz(), vout); | |
3207 | in->free_input_view((*p)->offset(), (*p)->filesz(), vin); | |
3208 | } | |
3209 | } | |
3210 | ||
3211 | out.close(); | |
3212 | } | |
3213 | ||
7d9e3d98 ILT |
3214 | // Print the output sections to the map file. |
3215 | ||
3216 | void | |
3217 | Layout::print_to_mapfile(Mapfile* mapfile) const | |
3218 | { | |
3219 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
3220 | p != this->segment_list_.end(); | |
3221 | ++p) | |
3222 | (*p)->print_sections_to_mapfile(mapfile); | |
3223 | } | |
3224 | ||
ad8f37d1 ILT |
3225 | // Print statistical information to stderr. This is used for --stats. |
3226 | ||
3227 | void | |
3228 | Layout::print_stats() const | |
3229 | { | |
3230 | this->namepool_.print_stats("section name pool"); | |
3231 | this->sympool_.print_stats("output symbol name pool"); | |
3232 | this->dynpool_.print_stats("dynamic name pool"); | |
38c5e8b4 ILT |
3233 | |
3234 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
3235 | p != this->section_list_.end(); | |
3236 | ++p) | |
3237 | (*p)->print_merge_stats(); | |
ad8f37d1 ILT |
3238 | } |
3239 | ||
730cdc88 ILT |
3240 | // Write_sections_task methods. |
3241 | ||
3242 | // We can always run this task. | |
3243 | ||
17a1d0a9 ILT |
3244 | Task_token* |
3245 | Write_sections_task::is_runnable() | |
730cdc88 | 3246 | { |
17a1d0a9 | 3247 | return NULL; |
730cdc88 ILT |
3248 | } |
3249 | ||
3250 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
3251 | // when finished. | |
3252 | ||
17a1d0a9 ILT |
3253 | void |
3254 | Write_sections_task::locks(Task_locker* tl) | |
730cdc88 | 3255 | { |
17a1d0a9 ILT |
3256 | tl->add(this, this->output_sections_blocker_); |
3257 | tl->add(this, this->final_blocker_); | |
730cdc88 ILT |
3258 | } |
3259 | ||
3260 | // Run the task--write out the data. | |
3261 | ||
3262 | void | |
3263 | Write_sections_task::run(Workqueue*) | |
3264 | { | |
3265 | this->layout_->write_output_sections(this->of_); | |
3266 | } | |
3267 | ||
61ba1cf9 ILT |
3268 | // Write_data_task methods. |
3269 | ||
3270 | // We can always run this task. | |
3271 | ||
17a1d0a9 ILT |
3272 | Task_token* |
3273 | Write_data_task::is_runnable() | |
61ba1cf9 | 3274 | { |
17a1d0a9 | 3275 | return NULL; |
61ba1cf9 ILT |
3276 | } |
3277 | ||
3278 | // We need to unlock FINAL_BLOCKER when finished. | |
3279 | ||
17a1d0a9 ILT |
3280 | void |
3281 | Write_data_task::locks(Task_locker* tl) | |
61ba1cf9 | 3282 | { |
17a1d0a9 | 3283 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
3284 | } |
3285 | ||
3286 | // Run the task--write out the data. | |
3287 | ||
3288 | void | |
3289 | Write_data_task::run(Workqueue*) | |
3290 | { | |
9025d29d | 3291 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
3292 | } |
3293 | ||
3294 | // Write_symbols_task methods. | |
3295 | ||
3296 | // We can always run this task. | |
3297 | ||
17a1d0a9 ILT |
3298 | Task_token* |
3299 | Write_symbols_task::is_runnable() | |
61ba1cf9 | 3300 | { |
17a1d0a9 | 3301 | return NULL; |
61ba1cf9 ILT |
3302 | } |
3303 | ||
3304 | // We need to unlock FINAL_BLOCKER when finished. | |
3305 | ||
17a1d0a9 ILT |
3306 | void |
3307 | Write_symbols_task::locks(Task_locker* tl) | |
61ba1cf9 | 3308 | { |
17a1d0a9 | 3309 | tl->add(this, this->final_blocker_); |
61ba1cf9 ILT |
3310 | } |
3311 | ||
3312 | // Run the task--write out the symbols. | |
3313 | ||
3314 | void | |
3315 | Write_symbols_task::run(Workqueue*) | |
3316 | { | |
9a2d6984 | 3317 | this->symtab_->write_globals(this->input_objects_, this->sympool_, |
d491d34e ILT |
3318 | this->dynpool_, this->layout_->symtab_xindex(), |
3319 | this->layout_->dynsym_xindex(), this->of_); | |
61ba1cf9 ILT |
3320 | } |
3321 | ||
730cdc88 ILT |
3322 | // Write_after_input_sections_task methods. |
3323 | ||
3324 | // We can only run this task after the input sections have completed. | |
3325 | ||
17a1d0a9 ILT |
3326 | Task_token* |
3327 | Write_after_input_sections_task::is_runnable() | |
730cdc88 ILT |
3328 | { |
3329 | if (this->input_sections_blocker_->is_blocked()) | |
17a1d0a9 ILT |
3330 | return this->input_sections_blocker_; |
3331 | return NULL; | |
730cdc88 ILT |
3332 | } |
3333 | ||
3334 | // We need to unlock FINAL_BLOCKER when finished. | |
3335 | ||
17a1d0a9 ILT |
3336 | void |
3337 | Write_after_input_sections_task::locks(Task_locker* tl) | |
730cdc88 | 3338 | { |
17a1d0a9 | 3339 | tl->add(this, this->final_blocker_); |
730cdc88 ILT |
3340 | } |
3341 | ||
3342 | // Run the task. | |
3343 | ||
3344 | void | |
3345 | Write_after_input_sections_task::run(Workqueue*) | |
3346 | { | |
3347 | this->layout_->write_sections_after_input_sections(this->of_); | |
3348 | } | |
3349 | ||
92e059d8 | 3350 | // Close_task_runner methods. |
61ba1cf9 ILT |
3351 | |
3352 | // Run the task--close the file. | |
3353 | ||
3354 | void | |
17a1d0a9 | 3355 | Close_task_runner::run(Workqueue*, const Task*) |
61ba1cf9 | 3356 | { |
8ed814a9 ILT |
3357 | // If we need to compute a checksum for the BUILD if, we do so here. |
3358 | this->layout_->write_build_id(this->of_); | |
3359 | ||
516cb3d0 | 3360 | // If we've been asked to create a binary file, we do so here. |
7cc619c3 | 3361 | if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF) |
516cb3d0 ILT |
3362 | this->layout_->write_binary(this->of_); |
3363 | ||
61ba1cf9 ILT |
3364 | this->of_->close(); |
3365 | } | |
3366 | ||
a2fb1b05 ILT |
3367 | // Instantiate the templates we need. We could use the configure |
3368 | // script to restrict this to only the ones for implemented targets. | |
3369 | ||
193a53d9 | 3370 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 ILT |
3371 | template |
3372 | Output_section* | |
730cdc88 ILT |
3373 | Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx, |
3374 | const char* name, | |
3375 | const elfcpp::Shdr<32, false>& shdr, | |
3376 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3377 | #endif |
a2fb1b05 | 3378 | |
193a53d9 | 3379 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
3380 | template |
3381 | Output_section* | |
730cdc88 ILT |
3382 | Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx, |
3383 | const char* name, | |
3384 | const elfcpp::Shdr<32, true>& shdr, | |
3385 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3386 | #endif |
a2fb1b05 | 3387 | |
193a53d9 | 3388 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
3389 | template |
3390 | Output_section* | |
730cdc88 ILT |
3391 | Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx, |
3392 | const char* name, | |
3393 | const elfcpp::Shdr<64, false>& shdr, | |
3394 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3395 | #endif |
a2fb1b05 | 3396 | |
193a53d9 | 3397 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
3398 | template |
3399 | Output_section* | |
730cdc88 ILT |
3400 | Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx, |
3401 | const char* name, | |
3402 | const elfcpp::Shdr<64, true>& shdr, | |
3403 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 3404 | #endif |
a2fb1b05 | 3405 | |
6a74a719 ILT |
3406 | #ifdef HAVE_TARGET_32_LITTLE |
3407 | template | |
3408 | Output_section* | |
3409 | Layout::layout_reloc<32, false>(Sized_relobj<32, false>* object, | |
3410 | unsigned int reloc_shndx, | |
3411 | const elfcpp::Shdr<32, false>& shdr, | |
3412 | Output_section* data_section, | |
3413 | Relocatable_relocs* rr); | |
3414 | #endif | |
3415 | ||
3416 | #ifdef HAVE_TARGET_32_BIG | |
3417 | template | |
3418 | Output_section* | |
3419 | Layout::layout_reloc<32, true>(Sized_relobj<32, true>* object, | |
3420 | unsigned int reloc_shndx, | |
3421 | const elfcpp::Shdr<32, true>& shdr, | |
3422 | Output_section* data_section, | |
3423 | Relocatable_relocs* rr); | |
3424 | #endif | |
3425 | ||
3426 | #ifdef HAVE_TARGET_64_LITTLE | |
3427 | template | |
3428 | Output_section* | |
3429 | Layout::layout_reloc<64, false>(Sized_relobj<64, false>* object, | |
3430 | unsigned int reloc_shndx, | |
3431 | const elfcpp::Shdr<64, false>& shdr, | |
3432 | Output_section* data_section, | |
3433 | Relocatable_relocs* rr); | |
3434 | #endif | |
3435 | ||
3436 | #ifdef HAVE_TARGET_64_BIG | |
3437 | template | |
3438 | Output_section* | |
3439 | Layout::layout_reloc<64, true>(Sized_relobj<64, true>* object, | |
3440 | unsigned int reloc_shndx, | |
3441 | const elfcpp::Shdr<64, true>& shdr, | |
3442 | Output_section* data_section, | |
3443 | Relocatable_relocs* rr); | |
3444 | #endif | |
3445 | ||
3446 | #ifdef HAVE_TARGET_32_LITTLE | |
3447 | template | |
3448 | void | |
3449 | Layout::layout_group<32, false>(Symbol_table* symtab, | |
3450 | Sized_relobj<32, false>* object, | |
3451 | unsigned int, | |
3452 | const char* group_section_name, | |
3453 | const char* signature, | |
3454 | const elfcpp::Shdr<32, false>& shdr, | |
8825ac63 ILT |
3455 | elfcpp::Elf_Word flags, |
3456 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3457 | #endif |
3458 | ||
3459 | #ifdef HAVE_TARGET_32_BIG | |
3460 | template | |
3461 | void | |
3462 | Layout::layout_group<32, true>(Symbol_table* symtab, | |
3463 | Sized_relobj<32, true>* object, | |
3464 | unsigned int, | |
3465 | const char* group_section_name, | |
3466 | const char* signature, | |
3467 | const elfcpp::Shdr<32, true>& shdr, | |
8825ac63 ILT |
3468 | elfcpp::Elf_Word flags, |
3469 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3470 | #endif |
3471 | ||
3472 | #ifdef HAVE_TARGET_64_LITTLE | |
3473 | template | |
3474 | void | |
3475 | Layout::layout_group<64, false>(Symbol_table* symtab, | |
3476 | Sized_relobj<64, false>* object, | |
3477 | unsigned int, | |
3478 | const char* group_section_name, | |
3479 | const char* signature, | |
3480 | const elfcpp::Shdr<64, false>& shdr, | |
8825ac63 ILT |
3481 | elfcpp::Elf_Word flags, |
3482 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3483 | #endif |
3484 | ||
3485 | #ifdef HAVE_TARGET_64_BIG | |
3486 | template | |
3487 | void | |
3488 | Layout::layout_group<64, true>(Symbol_table* symtab, | |
3489 | Sized_relobj<64, true>* object, | |
3490 | unsigned int, | |
3491 | const char* group_section_name, | |
3492 | const char* signature, | |
3493 | const elfcpp::Shdr<64, true>& shdr, | |
8825ac63 ILT |
3494 | elfcpp::Elf_Word flags, |
3495 | std::vector<unsigned int>* shndxes); | |
6a74a719 ILT |
3496 | #endif |
3497 | ||
730cdc88 ILT |
3498 | #ifdef HAVE_TARGET_32_LITTLE |
3499 | template | |
3500 | Output_section* | |
3501 | Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object, | |
3502 | const unsigned char* symbols, | |
3503 | off_t symbols_size, | |
3504 | const unsigned char* symbol_names, | |
3505 | off_t symbol_names_size, | |
3506 | unsigned int shndx, | |
3507 | const elfcpp::Shdr<32, false>& shdr, | |
3508 | unsigned int reloc_shndx, | |
3509 | unsigned int reloc_type, | |
3510 | off_t* off); | |
3511 | #endif | |
3512 | ||
3513 | #ifdef HAVE_TARGET_32_BIG | |
3514 | template | |
3515 | Output_section* | |
3516 | Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object, | |
3517 | const unsigned char* symbols, | |
3518 | off_t symbols_size, | |
3519 | const unsigned char* symbol_names, | |
3520 | off_t symbol_names_size, | |
3521 | unsigned int shndx, | |
3522 | const elfcpp::Shdr<32, true>& shdr, | |
3523 | unsigned int reloc_shndx, | |
3524 | unsigned int reloc_type, | |
3525 | off_t* off); | |
3526 | #endif | |
3527 | ||
3528 | #ifdef HAVE_TARGET_64_LITTLE | |
3529 | template | |
3530 | Output_section* | |
3531 | Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object, | |
3532 | const unsigned char* symbols, | |
3533 | off_t symbols_size, | |
3534 | const unsigned char* symbol_names, | |
3535 | off_t symbol_names_size, | |
3536 | unsigned int shndx, | |
3537 | const elfcpp::Shdr<64, false>& shdr, | |
3538 | unsigned int reloc_shndx, | |
3539 | unsigned int reloc_type, | |
3540 | off_t* off); | |
3541 | #endif | |
3542 | ||
3543 | #ifdef HAVE_TARGET_64_BIG | |
3544 | template | |
3545 | Output_section* | |
3546 | Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object, | |
3547 | const unsigned char* symbols, | |
3548 | off_t symbols_size, | |
3549 | const unsigned char* symbol_names, | |
3550 | off_t symbol_names_size, | |
3551 | unsigned int shndx, | |
3552 | const elfcpp::Shdr<64, true>& shdr, | |
3553 | unsigned int reloc_shndx, | |
3554 | unsigned int reloc_type, | |
3555 | off_t* off); | |
3556 | #endif | |
a2fb1b05 ILT |
3557 | |
3558 | } // End namespace gold. |