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bae7f79e ILT |
1 | // object.cc -- support for an object file for linking in gold |
2 | ||
b3adc24a | 3 | // Copyright (C) 2006-2020 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 | ||
bae7f79e ILT |
23 | #include "gold.h" |
24 | ||
25 | #include <cerrno> | |
26 | #include <cstring> | |
645f8123 | 27 | #include <cstdarg> |
a2b1aa12 | 28 | #include "demangle.h" |
9a2d6984 | 29 | #include "libiberty.h" |
bae7f79e | 30 | |
6d03d481 | 31 | #include "gc.h" |
14bfc3f5 | 32 | #include "target-select.h" |
5c2c6c95 | 33 | #include "dwarf_reader.h" |
a2fb1b05 | 34 | #include "layout.h" |
61ba1cf9 | 35 | #include "output.h" |
f6ce93d6 | 36 | #include "symtab.h" |
92de84a6 | 37 | #include "cref.h" |
4c50553d | 38 | #include "reloc.h" |
f6ce93d6 ILT |
39 | #include "object.h" |
40 | #include "dynobj.h" | |
5995b570 | 41 | #include "plugin.h" |
a2e47362 | 42 | #include "compressed_output.h" |
09ec0418 | 43 | #include "incremental.h" |
dbe40a88 | 44 | #include "merge.h" |
bae7f79e ILT |
45 | |
46 | namespace gold | |
47 | { | |
48 | ||
00698fc5 CC |
49 | // Struct Read_symbols_data. |
50 | ||
d2d60eef CC |
51 | // Destroy any remaining File_view objects and buffers of decompressed |
52 | // sections. | |
00698fc5 CC |
53 | |
54 | Read_symbols_data::~Read_symbols_data() | |
55 | { | |
56 | if (this->section_headers != NULL) | |
57 | delete this->section_headers; | |
58 | if (this->section_names != NULL) | |
59 | delete this->section_names; | |
60 | if (this->symbols != NULL) | |
61 | delete this->symbols; | |
62 | if (this->symbol_names != NULL) | |
63 | delete this->symbol_names; | |
64 | if (this->versym != NULL) | |
65 | delete this->versym; | |
66 | if (this->verdef != NULL) | |
67 | delete this->verdef; | |
68 | if (this->verneed != NULL) | |
69 | delete this->verneed; | |
70 | } | |
71 | ||
d491d34e ILT |
72 | // Class Xindex. |
73 | ||
74 | // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX | |
75 | // section and read it in. SYMTAB_SHNDX is the index of the symbol | |
76 | // table we care about. | |
77 | ||
78 | template<int size, bool big_endian> | |
79 | void | |
2ea97941 | 80 | Xindex::initialize_symtab_xindex(Object* object, unsigned int symtab_shndx) |
d491d34e ILT |
81 | { |
82 | if (!this->symtab_xindex_.empty()) | |
83 | return; | |
84 | ||
2ea97941 | 85 | gold_assert(symtab_shndx != 0); |
d491d34e ILT |
86 | |
87 | // Look through the sections in reverse order, on the theory that it | |
88 | // is more likely to be near the end than the beginning. | |
89 | unsigned int i = object->shnum(); | |
90 | while (i > 0) | |
91 | { | |
92 | --i; | |
93 | if (object->section_type(i) == elfcpp::SHT_SYMTAB_SHNDX | |
2ea97941 | 94 | && this->adjust_shndx(object->section_link(i)) == symtab_shndx) |
d491d34e ILT |
95 | { |
96 | this->read_symtab_xindex<size, big_endian>(object, i, NULL); | |
97 | return; | |
98 | } | |
99 | } | |
100 | ||
101 | object->error(_("missing SHT_SYMTAB_SHNDX section")); | |
102 | } | |
103 | ||
104 | // Read in the symtab_xindex_ array, given the section index of the | |
105 | // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the | |
106 | // section headers. | |
107 | ||
108 | template<int size, bool big_endian> | |
109 | void | |
110 | Xindex::read_symtab_xindex(Object* object, unsigned int xindex_shndx, | |
111 | const unsigned char* pshdrs) | |
112 | { | |
113 | section_size_type bytecount; | |
114 | const unsigned char* contents; | |
115 | if (pshdrs == NULL) | |
116 | contents = object->section_contents(xindex_shndx, &bytecount, false); | |
117 | else | |
118 | { | |
119 | const unsigned char* p = (pshdrs | |
120 | + (xindex_shndx | |
121 | * elfcpp::Elf_sizes<size>::shdr_size)); | |
122 | typename elfcpp::Shdr<size, big_endian> shdr(p); | |
123 | bytecount = convert_to_section_size_type(shdr.get_sh_size()); | |
124 | contents = object->get_view(shdr.get_sh_offset(), bytecount, true, false); | |
125 | } | |
126 | ||
127 | gold_assert(this->symtab_xindex_.empty()); | |
128 | this->symtab_xindex_.reserve(bytecount / 4); | |
129 | for (section_size_type i = 0; i < bytecount; i += 4) | |
130 | { | |
131 | unsigned int shndx = elfcpp::Swap<32, big_endian>::readval(contents + i); | |
132 | // We preadjust the section indexes we save. | |
133 | this->symtab_xindex_.push_back(this->adjust_shndx(shndx)); | |
134 | } | |
135 | } | |
136 | ||
137 | // Symbol symndx has a section of SHN_XINDEX; return the real section | |
138 | // index. | |
139 | ||
140 | unsigned int | |
141 | Xindex::sym_xindex_to_shndx(Object* object, unsigned int symndx) | |
142 | { | |
143 | if (symndx >= this->symtab_xindex_.size()) | |
144 | { | |
145 | object->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"), | |
146 | symndx); | |
147 | return elfcpp::SHN_UNDEF; | |
148 | } | |
149 | unsigned int shndx = this->symtab_xindex_[symndx]; | |
150 | if (shndx < elfcpp::SHN_LORESERVE || shndx >= object->shnum()) | |
151 | { | |
152 | object->error(_("extended index for symbol %u out of range: %u"), | |
153 | symndx, shndx); | |
154 | return elfcpp::SHN_UNDEF; | |
155 | } | |
156 | return shndx; | |
157 | } | |
158 | ||
645f8123 ILT |
159 | // Class Object. |
160 | ||
75f2446e ILT |
161 | // Report an error for this object file. This is used by the |
162 | // elfcpp::Elf_file interface, and also called by the Object code | |
163 | // itself. | |
645f8123 ILT |
164 | |
165 | void | |
75f2446e | 166 | Object::error(const char* format, ...) const |
645f8123 ILT |
167 | { |
168 | va_list args; | |
645f8123 | 169 | va_start(args, format); |
75f2446e ILT |
170 | char* buf = NULL; |
171 | if (vasprintf(&buf, format, args) < 0) | |
172 | gold_nomem(); | |
645f8123 | 173 | va_end(args); |
75f2446e ILT |
174 | gold_error(_("%s: %s"), this->name().c_str(), buf); |
175 | free(buf); | |
645f8123 ILT |
176 | } |
177 | ||
178 | // Return a view of the contents of a section. | |
179 | ||
180 | const unsigned char* | |
8383303e ILT |
181 | Object::section_contents(unsigned int shndx, section_size_type* plen, |
182 | bool cache) | |
c1027032 | 183 | { return this->do_section_contents(shndx, plen, cache); } |
645f8123 | 184 | |
6fa2a40b | 185 | // Read the section data into SD. This is code common to Sized_relobj_file |
dbe717ef ILT |
186 | // and Sized_dynobj, so we put it into Object. |
187 | ||
188 | template<int size, bool big_endian> | |
189 | void | |
190 | Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file, | |
191 | Read_symbols_data* sd) | |
192 | { | |
193 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
194 | ||
195 | // Read the section headers. | |
196 | const off_t shoff = elf_file->shoff(); | |
2ea97941 ILT |
197 | const unsigned int shnum = this->shnum(); |
198 | sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size, | |
39d0cb0e | 199 | true, true); |
dbe717ef ILT |
200 | |
201 | // Read the section names. | |
202 | const unsigned char* pshdrs = sd->section_headers->data(); | |
203 | const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size; | |
204 | typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames); | |
205 | ||
206 | if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB) | |
75f2446e ILT |
207 | this->error(_("section name section has wrong type: %u"), |
208 | static_cast<unsigned int>(shdrnames.get_sh_type())); | |
dbe717ef | 209 | |
8383303e ILT |
210 | sd->section_names_size = |
211 | convert_to_section_size_type(shdrnames.get_sh_size()); | |
dbe717ef | 212 | sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), |
39d0cb0e ILT |
213 | sd->section_names_size, false, |
214 | false); | |
dbe717ef ILT |
215 | } |
216 | ||
2ea97941 | 217 | // If NAME is the name of a special .gnu.warning section, arrange for |
dbe717ef ILT |
218 | // the warning to be issued. SHNDX is the section index. Return |
219 | // whether it is a warning section. | |
220 | ||
221 | bool | |
2ea97941 | 222 | Object::handle_gnu_warning_section(const char* name, unsigned int shndx, |
dbe717ef ILT |
223 | Symbol_table* symtab) |
224 | { | |
225 | const char warn_prefix[] = ".gnu.warning."; | |
226 | const int warn_prefix_len = sizeof warn_prefix - 1; | |
2ea97941 | 227 | if (strncmp(name, warn_prefix, warn_prefix_len) == 0) |
dbe717ef | 228 | { |
cb295612 ILT |
229 | // Read the section contents to get the warning text. It would |
230 | // be nicer if we only did this if we have to actually issue a | |
231 | // warning. Unfortunately, warnings are issued as we relocate | |
232 | // sections. That means that we can not lock the object then, | |
233 | // as we might try to issue the same warning multiple times | |
234 | // simultaneously. | |
235 | section_size_type len; | |
236 | const unsigned char* contents = this->section_contents(shndx, &len, | |
237 | false); | |
8d63875c ILT |
238 | if (len == 0) |
239 | { | |
2ea97941 | 240 | const char* warning = name + warn_prefix_len; |
8d63875c ILT |
241 | contents = reinterpret_cast<const unsigned char*>(warning); |
242 | len = strlen(warning); | |
243 | } | |
cb295612 | 244 | std::string warning(reinterpret_cast<const char*>(contents), len); |
2ea97941 | 245 | symtab->add_warning(name + warn_prefix_len, this, warning); |
dbe717ef ILT |
246 | return true; |
247 | } | |
248 | return false; | |
249 | } | |
250 | ||
2ea97941 | 251 | // If NAME is the name of the special section which indicates that |
9b547ce6 | 252 | // this object was compiled with -fsplit-stack, mark it accordingly. |
364c7fa5 ILT |
253 | |
254 | bool | |
2ea97941 | 255 | Object::handle_split_stack_section(const char* name) |
364c7fa5 | 256 | { |
2ea97941 | 257 | if (strcmp(name, ".note.GNU-split-stack") == 0) |
364c7fa5 ILT |
258 | { |
259 | this->uses_split_stack_ = true; | |
260 | return true; | |
261 | } | |
2ea97941 | 262 | if (strcmp(name, ".note.GNU-no-split-stack") == 0) |
364c7fa5 ILT |
263 | { |
264 | this->has_no_split_stack_ = true; | |
265 | return true; | |
266 | } | |
267 | return false; | |
268 | } | |
269 | ||
6d03d481 ST |
270 | // Class Relobj |
271 | ||
dbe40a88 RÁE |
272 | template<int size> |
273 | void | |
274 | Relobj::initialize_input_to_output_map(unsigned int shndx, | |
275 | typename elfcpp::Elf_types<size>::Elf_Addr starting_address, | |
276 | Unordered_map<section_offset_type, | |
277 | typename elfcpp::Elf_types<size>::Elf_Addr>* output_addresses) const { | |
278 | Object_merge_map *map = this->object_merge_map_; | |
279 | map->initialize_input_to_output_map<size>(shndx, starting_address, | |
280 | output_addresses); | |
281 | } | |
282 | ||
283 | void | |
284 | Relobj::add_merge_mapping(Output_section_data *output_data, | |
285 | unsigned int shndx, section_offset_type offset, | |
286 | section_size_type length, | |
287 | section_offset_type output_offset) { | |
0916f9e7 RÁE |
288 | Object_merge_map* object_merge_map = this->get_or_create_merge_map(); |
289 | object_merge_map->add_mapping(output_data, shndx, offset, length, output_offset); | |
dbe40a88 RÁE |
290 | } |
291 | ||
292 | bool | |
293 | Relobj::merge_output_offset(unsigned int shndx, section_offset_type offset, | |
294 | section_offset_type *poutput) const { | |
295 | Object_merge_map* object_merge_map = this->object_merge_map_; | |
296 | if (object_merge_map == NULL) | |
297 | return false; | |
298 | return object_merge_map->get_output_offset(shndx, offset, poutput); | |
299 | } | |
300 | ||
67f95b96 RÁE |
301 | const Output_section_data* |
302 | Relobj::find_merge_section(unsigned int shndx) const { | |
dbe40a88 RÁE |
303 | Object_merge_map* object_merge_map = this->object_merge_map_; |
304 | if (object_merge_map == NULL) | |
67f95b96 RÁE |
305 | return NULL; |
306 | return object_merge_map->find_merge_section(shndx); | |
dbe40a88 RÁE |
307 | } |
308 | ||
6d03d481 | 309 | // To copy the symbols data read from the file to a local data structure. |
2e702c99 | 310 | // This function is called from do_layout only while doing garbage |
6d03d481 ST |
311 | // collection. |
312 | ||
313 | void | |
2e702c99 RM |
314 | Relobj::copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, |
315 | unsigned int section_header_size) | |
6d03d481 | 316 | { |
2e702c99 RM |
317 | gc_sd->section_headers_data = |
318 | new unsigned char[(section_header_size)]; | |
6d03d481 | 319 | memcpy(gc_sd->section_headers_data, sd->section_headers->data(), |
2e702c99 RM |
320 | section_header_size); |
321 | gc_sd->section_names_data = | |
322 | new unsigned char[sd->section_names_size]; | |
6d03d481 | 323 | memcpy(gc_sd->section_names_data, sd->section_names->data(), |
2e702c99 | 324 | sd->section_names_size); |
6d03d481 ST |
325 | gc_sd->section_names_size = sd->section_names_size; |
326 | if (sd->symbols != NULL) | |
327 | { | |
2e702c99 RM |
328 | gc_sd->symbols_data = |
329 | new unsigned char[sd->symbols_size]; | |
6d03d481 | 330 | memcpy(gc_sd->symbols_data, sd->symbols->data(), |
2e702c99 | 331 | sd->symbols_size); |
6d03d481 ST |
332 | } |
333 | else | |
334 | { | |
335 | gc_sd->symbols_data = NULL; | |
336 | } | |
337 | gc_sd->symbols_size = sd->symbols_size; | |
338 | gc_sd->external_symbols_offset = sd->external_symbols_offset; | |
339 | if (sd->symbol_names != NULL) | |
340 | { | |
341 | gc_sd->symbol_names_data = | |
2e702c99 | 342 | new unsigned char[sd->symbol_names_size]; |
6d03d481 | 343 | memcpy(gc_sd->symbol_names_data, sd->symbol_names->data(), |
2e702c99 | 344 | sd->symbol_names_size); |
6d03d481 ST |
345 | } |
346 | else | |
347 | { | |
348 | gc_sd->symbol_names_data = NULL; | |
349 | } | |
350 | gc_sd->symbol_names_size = sd->symbol_names_size; | |
351 | } | |
352 | ||
353 | // This function determines if a particular section name must be included | |
354 | // in the link. This is used during garbage collection to determine the | |
355 | // roots of the worklist. | |
356 | ||
357 | bool | |
2ea97941 | 358 | Relobj::is_section_name_included(const char* name) |
6d03d481 | 359 | { |
2e702c99 RM |
360 | if (is_prefix_of(".ctors", name) |
361 | || is_prefix_of(".dtors", name) | |
362 | || is_prefix_of(".note", name) | |
363 | || is_prefix_of(".init", name) | |
364 | || is_prefix_of(".fini", name) | |
365 | || is_prefix_of(".gcc_except_table", name) | |
366 | || is_prefix_of(".jcr", name) | |
367 | || is_prefix_of(".preinit_array", name) | |
368 | || (is_prefix_of(".text", name) | |
369 | && strstr(name, "personality")) | |
370 | || (is_prefix_of(".data", name) | |
1698990d AM |
371 | && strstr(name, "personality")) |
372 | || (is_prefix_of(".sdata", name) | |
373 | && strstr(name, "personality")) | |
fa618ee4 | 374 | || (is_prefix_of(".gnu.linkonce.d", name) |
5ad9b0a7 ST |
375 | && strstr(name, "personality")) |
376 | || (is_prefix_of(".rodata", name) | |
377 | && strstr(name, "nptl_version"))) | |
6d03d481 | 378 | { |
2e702c99 | 379 | return true; |
6d03d481 ST |
380 | } |
381 | return false; | |
382 | } | |
383 | ||
09ec0418 CC |
384 | // Finalize the incremental relocation information. Allocates a block |
385 | // of relocation entries for each symbol, and sets the reloc_bases_ | |
cdc29364 CC |
386 | // array to point to the first entry in each block. If CLEAR_COUNTS |
387 | // is TRUE, also clear the per-symbol relocation counters. | |
09ec0418 CC |
388 | |
389 | void | |
cdc29364 | 390 | Relobj::finalize_incremental_relocs(Layout* layout, bool clear_counts) |
09ec0418 CC |
391 | { |
392 | unsigned int nsyms = this->get_global_symbols()->size(); | |
393 | this->reloc_bases_ = new unsigned int[nsyms]; | |
394 | ||
395 | gold_assert(this->reloc_bases_ != NULL); | |
396 | gold_assert(layout->incremental_inputs() != NULL); | |
397 | ||
398 | unsigned int rindex = layout->incremental_inputs()->get_reloc_count(); | |
399 | for (unsigned int i = 0; i < nsyms; ++i) | |
400 | { | |
401 | this->reloc_bases_[i] = rindex; | |
402 | rindex += this->reloc_counts_[i]; | |
cdc29364 CC |
403 | if (clear_counts) |
404 | this->reloc_counts_[i] = 0; | |
09ec0418 CC |
405 | } |
406 | layout->incremental_inputs()->set_reloc_count(rindex); | |
407 | } | |
408 | ||
0916f9e7 RÁE |
409 | Object_merge_map* |
410 | Relobj::get_or_create_merge_map() | |
411 | { | |
412 | if (!this->object_merge_map_) | |
413 | this->object_merge_map_ = new Object_merge_map(); | |
414 | return this->object_merge_map_; | |
415 | } | |
416 | ||
f6ce93d6 | 417 | // Class Sized_relobj. |
bae7f79e | 418 | |
6fa2a40b CC |
419 | // Iterate over local symbols, calling a visitor class V for each GOT offset |
420 | // associated with a local symbol. | |
421 | ||
bae7f79e | 422 | template<int size, bool big_endian> |
6fa2a40b CC |
423 | void |
424 | Sized_relobj<size, big_endian>::do_for_all_local_got_entries( | |
425 | Got_offset_list::Visitor* v) const | |
426 | { | |
427 | unsigned int nsyms = this->local_symbol_count(); | |
428 | for (unsigned int i = 0; i < nsyms; i++) | |
429 | { | |
7ef8ae7c VR |
430 | Local_got_entry_key key(i, 0); |
431 | Local_got_offsets::const_iterator p = this->local_got_offsets_.find(key); | |
6fa2a40b CC |
432 | if (p != this->local_got_offsets_.end()) |
433 | { | |
434 | const Got_offset_list* got_offsets = p->second; | |
435 | got_offsets->for_all_got_offsets(v); | |
436 | } | |
437 | } | |
438 | } | |
439 | ||
c6905c28 CC |
440 | // Get the address of an output section. |
441 | ||
442 | template<int size, bool big_endian> | |
443 | uint64_t | |
444 | Sized_relobj<size, big_endian>::do_output_section_address( | |
445 | unsigned int shndx) | |
446 | { | |
447 | // If the input file is linked as --just-symbols, the output | |
448 | // section address is the input section address. | |
449 | if (this->just_symbols()) | |
450 | return this->section_address(shndx); | |
451 | ||
452 | const Output_section* os = this->do_output_section(shndx); | |
453 | gold_assert(os != NULL); | |
454 | return os->address(); | |
455 | } | |
456 | ||
6fa2a40b CC |
457 | // Class Sized_relobj_file. |
458 | ||
459 | template<int size, bool big_endian> | |
460 | Sized_relobj_file<size, big_endian>::Sized_relobj_file( | |
2ea97941 ILT |
461 | const std::string& name, |
462 | Input_file* input_file, | |
463 | off_t offset, | |
bae7f79e | 464 | const elfcpp::Ehdr<size, big_endian>& ehdr) |
6fa2a40b | 465 | : Sized_relobj<size, big_endian>(name, input_file, offset), |
645f8123 | 466 | elf_file_(this, ehdr), |
dbe717ef | 467 | symtab_shndx_(-1U), |
61ba1cf9 ILT |
468 | local_symbol_count_(0), |
469 | output_local_symbol_count_(0), | |
7bf1f802 | 470 | output_local_dynsym_count_(0), |
730cdc88 | 471 | symbols_(), |
92de84a6 | 472 | defined_count_(0), |
61ba1cf9 | 473 | local_symbol_offset_(0), |
7bf1f802 | 474 | local_dynsym_offset_(0), |
e727fa71 | 475 | local_values_(), |
7223e9ca | 476 | local_plt_offsets_(), |
ef9beddf | 477 | kept_comdat_sections_(), |
805bb01c | 478 | has_eh_frame_(false), |
c924eb67 | 479 | is_deferred_layout_(false), |
a2e47362 | 480 | deferred_layout_(), |
6b2353a5 CC |
481 | deferred_layout_relocs_(), |
482 | output_views_(NULL) | |
bae7f79e | 483 | { |
9590bf25 | 484 | this->e_type_ = ehdr.get_e_type(); |
bae7f79e ILT |
485 | } |
486 | ||
487 | template<int size, bool big_endian> | |
6fa2a40b | 488 | Sized_relobj_file<size, big_endian>::~Sized_relobj_file() |
bae7f79e ILT |
489 | { |
490 | } | |
491 | ||
645f8123 | 492 | // Set up an object file based on the file header. This sets up the |
029ba973 | 493 | // section information. |
bae7f79e ILT |
494 | |
495 | template<int size, bool big_endian> | |
496 | void | |
6fa2a40b | 497 | Sized_relobj_file<size, big_endian>::do_setup() |
bae7f79e | 498 | { |
2ea97941 ILT |
499 | const unsigned int shnum = this->elf_file_.shnum(); |
500 | this->set_shnum(shnum); | |
dbe717ef | 501 | } |
12e14209 | 502 | |
dbe717ef ILT |
503 | // Find the SHT_SYMTAB section, given the section headers. The ELF |
504 | // standard says that maybe in the future there can be more than one | |
505 | // SHT_SYMTAB section. Until somebody figures out how that could | |
506 | // work, we assume there is only one. | |
12e14209 | 507 | |
dbe717ef ILT |
508 | template<int size, bool big_endian> |
509 | void | |
6fa2a40b | 510 | Sized_relobj_file<size, big_endian>::find_symtab(const unsigned char* pshdrs) |
dbe717ef | 511 | { |
2ea97941 | 512 | const unsigned int shnum = this->shnum(); |
dbe717ef | 513 | this->symtab_shndx_ = 0; |
2ea97941 | 514 | if (shnum > 0) |
bae7f79e | 515 | { |
dbe717ef ILT |
516 | // Look through the sections in reverse order, since gas tends |
517 | // to put the symbol table at the end. | |
2ea97941 ILT |
518 | const unsigned char* p = pshdrs + shnum * This::shdr_size; |
519 | unsigned int i = shnum; | |
d491d34e ILT |
520 | unsigned int xindex_shndx = 0; |
521 | unsigned int xindex_link = 0; | |
dbe717ef | 522 | while (i > 0) |
bae7f79e | 523 | { |
dbe717ef ILT |
524 | --i; |
525 | p -= This::shdr_size; | |
526 | typename This::Shdr shdr(p); | |
527 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) | |
528 | { | |
529 | this->symtab_shndx_ = i; | |
d491d34e ILT |
530 | if (xindex_shndx > 0 && xindex_link == i) |
531 | { | |
532 | Xindex* xindex = | |
533 | new Xindex(this->elf_file_.large_shndx_offset()); | |
534 | xindex->read_symtab_xindex<size, big_endian>(this, | |
535 | xindex_shndx, | |
536 | pshdrs); | |
537 | this->set_xindex(xindex); | |
538 | } | |
dbe717ef ILT |
539 | break; |
540 | } | |
d491d34e ILT |
541 | |
542 | // Try to pick up the SHT_SYMTAB_SHNDX section, if there is | |
543 | // one. This will work if it follows the SHT_SYMTAB | |
544 | // section. | |
545 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX) | |
546 | { | |
547 | xindex_shndx = i; | |
548 | xindex_link = this->adjust_shndx(shdr.get_sh_link()); | |
549 | } | |
bae7f79e | 550 | } |
bae7f79e ILT |
551 | } |
552 | } | |
553 | ||
d491d34e ILT |
554 | // Return the Xindex structure to use for object with lots of |
555 | // sections. | |
556 | ||
557 | template<int size, bool big_endian> | |
558 | Xindex* | |
6fa2a40b | 559 | Sized_relobj_file<size, big_endian>::do_initialize_xindex() |
d491d34e ILT |
560 | { |
561 | gold_assert(this->symtab_shndx_ != -1U); | |
562 | Xindex* xindex = new Xindex(this->elf_file_.large_shndx_offset()); | |
563 | xindex->initialize_symtab_xindex<size, big_endian>(this, this->symtab_shndx_); | |
564 | return xindex; | |
565 | } | |
566 | ||
730cdc88 ILT |
567 | // Return whether SHDR has the right type and flags to be a GNU |
568 | // .eh_frame section. | |
569 | ||
570 | template<int size, bool big_endian> | |
571 | bool | |
6fa2a40b | 572 | Sized_relobj_file<size, big_endian>::check_eh_frame_flags( |
730cdc88 ILT |
573 | const elfcpp::Shdr<size, big_endian>* shdr) const |
574 | { | |
4d5e4e62 ILT |
575 | elfcpp::Elf_Word sh_type = shdr->get_sh_type(); |
576 | return ((sh_type == elfcpp::SHT_PROGBITS | |
bce5a025 | 577 | || sh_type == parameters->target().unwind_section_type()) |
1650c4ff | 578 | && (shdr->get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 ILT |
579 | } |
580 | ||
cf43a2fe AM |
581 | // Find the section header with the given name. |
582 | ||
583 | template<int size, bool big_endian> | |
584 | const unsigned char* | |
dc3714f3 | 585 | Object::find_shdr( |
cf43a2fe AM |
586 | const unsigned char* pshdrs, |
587 | const char* name, | |
588 | const char* names, | |
589 | section_size_type names_size, | |
590 | const unsigned char* hdr) const | |
591 | { | |
dc3714f3 | 592 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
cf43a2fe | 593 | const unsigned int shnum = this->shnum(); |
dc3714f3 | 594 | const unsigned char* hdr_end = pshdrs + shdr_size * shnum; |
cf43a2fe AM |
595 | size_t sh_name = 0; |
596 | ||
597 | while (1) | |
598 | { | |
599 | if (hdr) | |
600 | { | |
601 | // We found HDR last time we were called, continue looking. | |
dc3714f3 | 602 | typename elfcpp::Shdr<size, big_endian> shdr(hdr); |
cf43a2fe AM |
603 | sh_name = shdr.get_sh_name(); |
604 | } | |
605 | else | |
606 | { | |
607 | // Look for the next occurrence of NAME in NAMES. | |
608 | // The fact that .shstrtab produced by current GNU tools is | |
609 | // string merged means we shouldn't have both .not.foo and | |
610 | // .foo in .shstrtab, and multiple .foo sections should all | |
611 | // have the same sh_name. However, this is not guaranteed | |
612 | // by the ELF spec and not all ELF object file producers may | |
613 | // be so clever. | |
614 | size_t len = strlen(name) + 1; | |
615 | const char *p = sh_name ? names + sh_name + len : names; | |
616 | p = reinterpret_cast<const char*>(memmem(p, names_size - (p - names), | |
617 | name, len)); | |
618 | if (p == NULL) | |
619 | return NULL; | |
620 | sh_name = p - names; | |
621 | hdr = pshdrs; | |
622 | if (sh_name == 0) | |
623 | return hdr; | |
624 | } | |
625 | ||
dc3714f3 | 626 | hdr += shdr_size; |
cf43a2fe AM |
627 | while (hdr < hdr_end) |
628 | { | |
dc3714f3 | 629 | typename elfcpp::Shdr<size, big_endian> shdr(hdr); |
cf43a2fe AM |
630 | if (shdr.get_sh_name() == sh_name) |
631 | return hdr; | |
dc3714f3 | 632 | hdr += shdr_size; |
cf43a2fe AM |
633 | } |
634 | hdr = NULL; | |
635 | if (sh_name == 0) | |
636 | return hdr; | |
637 | } | |
638 | } | |
639 | ||
730cdc88 ILT |
640 | // Return whether there is a GNU .eh_frame section, given the section |
641 | // headers and the section names. | |
642 | ||
643 | template<int size, bool big_endian> | |
644 | bool | |
6fa2a40b | 645 | Sized_relobj_file<size, big_endian>::find_eh_frame( |
8383303e ILT |
646 | const unsigned char* pshdrs, |
647 | const char* names, | |
648 | section_size_type names_size) const | |
730cdc88 | 649 | { |
cf43a2fe AM |
650 | const unsigned char* s = NULL; |
651 | ||
652 | while (1) | |
730cdc88 | 653 | { |
dc3714f3 AM |
654 | s = this->template find_shdr<size, big_endian>(pshdrs, ".eh_frame", |
655 | names, names_size, s); | |
cf43a2fe AM |
656 | if (s == NULL) |
657 | return false; | |
730cdc88 | 658 | |
cf43a2fe AM |
659 | typename This::Shdr shdr(s); |
660 | if (this->check_eh_frame_flags(&shdr)) | |
661 | return true; | |
730cdc88 | 662 | } |
730cdc88 ILT |
663 | } |
664 | ||
5dd8762a | 665 | // Return TRUE if this is a section whose contents will be needed in the |
c1027032 | 666 | // Add_symbols task. This function is only called for sections that have |
48058663 L |
667 | // already passed the test in is_compressed_debug_section() and the debug |
668 | // section name prefix, ".debug"/".zdebug", has been skipped. | |
5dd8762a CC |
669 | |
670 | static bool | |
671 | need_decompressed_section(const char* name) | |
672 | { | |
c1027032 CC |
673 | if (*name++ != '_') |
674 | return false; | |
675 | ||
676 | #ifdef ENABLE_THREADS | |
677 | // Decompressing these sections now will help only if we're | |
678 | // multithreaded. | |
679 | if (parameters->options().threads()) | |
680 | { | |
681 | // We will need .zdebug_str if this is not an incremental link | |
682 | // (i.e., we are processing string merge sections) or if we need | |
683 | // to build a gdb index. | |
684 | if ((!parameters->incremental() || parameters->options().gdb_index()) | |
685 | && strcmp(name, "str") == 0) | |
686 | return true; | |
687 | ||
688 | // We will need these other sections when building a gdb index. | |
689 | if (parameters->options().gdb_index() | |
690 | && (strcmp(name, "info") == 0 | |
691 | || strcmp(name, "types") == 0 | |
692 | || strcmp(name, "pubnames") == 0 | |
693 | || strcmp(name, "pubtypes") == 0 | |
694 | || strcmp(name, "ranges") == 0 | |
695 | || strcmp(name, "abbrev") == 0)) | |
696 | return true; | |
697 | } | |
698 | #endif | |
699 | ||
700 | // Even when single-threaded, we will need .zdebug_str if this is | |
701 | // not an incremental link and we are building a gdb index. | |
702 | // Otherwise, we would decompress the section twice: once for | |
703 | // string merge processing, and once for building the gdb index. | |
704 | if (!parameters->incremental() | |
705 | && parameters->options().gdb_index() | |
706 | && strcmp(name, "str") == 0) | |
5dd8762a CC |
707 | return true; |
708 | ||
709 | return false; | |
710 | } | |
711 | ||
a2e47362 | 712 | // Build a table for any compressed debug sections, mapping each section index |
5dd8762a | 713 | // to the uncompressed size and (if needed) the decompressed contents. |
a2e47362 CC |
714 | |
715 | template<int size, bool big_endian> | |
716 | Compressed_section_map* | |
717 | build_compressed_section_map( | |
718 | const unsigned char* pshdrs, | |
719 | unsigned int shnum, | |
720 | const char* names, | |
721 | section_size_type names_size, | |
0d5bbdb0 CC |
722 | Object* obj, |
723 | bool decompress_if_needed) | |
a2e47362 | 724 | { |
5dd8762a | 725 | Compressed_section_map* uncompressed_map = new Compressed_section_map(); |
a2e47362 CC |
726 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
727 | const unsigned char* p = pshdrs + shdr_size; | |
5dd8762a | 728 | |
a2e47362 CC |
729 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) |
730 | { | |
731 | typename elfcpp::Shdr<size, big_endian> shdr(p); | |
732 | if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS | |
733 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
734 | { | |
735 | if (shdr.get_sh_name() >= names_size) | |
736 | { | |
737 | obj->error(_("bad section name offset for section %u: %lu"), | |
738 | i, static_cast<unsigned long>(shdr.get_sh_name())); | |
739 | continue; | |
740 | } | |
741 | ||
742 | const char* name = names + shdr.get_sh_name(); | |
48058663 L |
743 | bool is_compressed = ((shdr.get_sh_flags() |
744 | & elfcpp::SHF_COMPRESSED) != 0); | |
745 | bool is_zcompressed = (!is_compressed | |
746 | && is_compressed_debug_section(name)); | |
747 | ||
748 | if (is_zcompressed || is_compressed) | |
a2e47362 CC |
749 | { |
750 | section_size_type len; | |
751 | const unsigned char* contents = | |
752 | obj->section_contents(i, &len, false); | |
48058663 | 753 | uint64_t uncompressed_size; |
5f6c22ae | 754 | Compressed_section_info info; |
48058663 L |
755 | if (is_zcompressed) |
756 | { | |
757 | // Skip over the ".zdebug" prefix. | |
758 | name += 7; | |
759 | uncompressed_size = get_uncompressed_size(contents, len); | |
5f6c22ae | 760 | info.addralign = shdr.get_sh_addralign(); |
48058663 L |
761 | } |
762 | else | |
763 | { | |
764 | // Skip over the ".debug" prefix. | |
765 | name += 6; | |
766 | elfcpp::Chdr<size, big_endian> chdr(contents); | |
767 | uncompressed_size = chdr.get_ch_size(); | |
5f6c22ae | 768 | info.addralign = chdr.get_ch_addralign(); |
48058663 | 769 | } |
c1027032 | 770 | info.size = convert_to_section_size_type(uncompressed_size); |
48058663 | 771 | info.flag = shdr.get_sh_flags(); |
c1027032 | 772 | info.contents = NULL; |
a2e47362 | 773 | if (uncompressed_size != -1ULL) |
5dd8762a | 774 | { |
c1027032 | 775 | unsigned char* uncompressed_data = NULL; |
0d5bbdb0 | 776 | if (decompress_if_needed && need_decompressed_section(name)) |
5dd8762a | 777 | { |
c1027032 CC |
778 | uncompressed_data = new unsigned char[uncompressed_size]; |
779 | if (decompress_input_section(contents, len, | |
780 | uncompressed_data, | |
48058663 L |
781 | uncompressed_size, |
782 | size, big_endian, | |
783 | shdr.get_sh_flags())) | |
c1027032 CC |
784 | info.contents = uncompressed_data; |
785 | else | |
786 | delete[] uncompressed_data; | |
5dd8762a | 787 | } |
5dd8762a CC |
788 | (*uncompressed_map)[i] = info; |
789 | } | |
a2e47362 CC |
790 | } |
791 | } | |
792 | } | |
5dd8762a | 793 | return uncompressed_map; |
a2e47362 CC |
794 | } |
795 | ||
cf43a2fe AM |
796 | // Stash away info for a number of special sections. |
797 | // Return true if any of the sections found require local symbols to be read. | |
798 | ||
799 | template<int size, bool big_endian> | |
800 | bool | |
801 | Sized_relobj_file<size, big_endian>::do_find_special_sections( | |
802 | Read_symbols_data* sd) | |
803 | { | |
804 | const unsigned char* const pshdrs = sd->section_headers->data(); | |
805 | const unsigned char* namesu = sd->section_names->data(); | |
806 | const char* names = reinterpret_cast<const char*>(namesu); | |
807 | ||
808 | if (this->find_eh_frame(pshdrs, names, sd->section_names_size)) | |
809 | this->has_eh_frame_ = true; | |
810 | ||
48058663 L |
811 | Compressed_section_map* compressed_sections = |
812 | build_compressed_section_map<size, big_endian>( | |
813 | pshdrs, this->shnum(), names, sd->section_names_size, this, true); | |
814 | if (compressed_sections != NULL) | |
815 | this->set_compressed_sections(compressed_sections); | |
0d5bbdb0 | 816 | |
cf43a2fe AM |
817 | return (this->has_eh_frame_ |
818 | || (!parameters->options().relocatable() | |
819 | && parameters->options().gdb_index() | |
08228b11 | 820 | && (memmem(names, sd->section_names_size, "debug_info", 11) != NULL |
aca5eec6 | 821 | || memmem(names, sd->section_names_size, |
08228b11 | 822 | "debug_types", 12) != NULL))); |
cf43a2fe AM |
823 | } |
824 | ||
12e14209 | 825 | // Read the sections and symbols from an object file. |
bae7f79e ILT |
826 | |
827 | template<int size, bool big_endian> | |
12e14209 | 828 | void |
6fa2a40b | 829 | Sized_relobj_file<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
f35c4853 CC |
830 | { |
831 | this->base_read_symbols(sd); | |
832 | } | |
833 | ||
834 | // Read the sections and symbols from an object file. This is common | |
835 | // code for all target-specific overrides of do_read_symbols(). | |
836 | ||
837 | template<int size, bool big_endian> | |
838 | void | |
839 | Sized_relobj_file<size, big_endian>::base_read_symbols(Read_symbols_data* sd) | |
bae7f79e | 840 | { |
dbe717ef | 841 | this->read_section_data(&this->elf_file_, sd); |
12e14209 | 842 | |
dbe717ef ILT |
843 | const unsigned char* const pshdrs = sd->section_headers->data(); |
844 | ||
845 | this->find_symtab(pshdrs); | |
12e14209 | 846 | |
cf43a2fe | 847 | bool need_local_symbols = this->do_find_special_sections(sd); |
c1027032 | 848 | |
75f2446e ILT |
849 | sd->symbols = NULL; |
850 | sd->symbols_size = 0; | |
730cdc88 | 851 | sd->external_symbols_offset = 0; |
75f2446e ILT |
852 | sd->symbol_names = NULL; |
853 | sd->symbol_names_size = 0; | |
854 | ||
645f8123 | 855 | if (this->symtab_shndx_ == 0) |
bae7f79e ILT |
856 | { |
857 | // No symbol table. Weird but legal. | |
12e14209 | 858 | return; |
bae7f79e ILT |
859 | } |
860 | ||
12e14209 ILT |
861 | // Get the symbol table section header. |
862 | typename This::Shdr symtabshdr(pshdrs | |
645f8123 | 863 | + this->symtab_shndx_ * This::shdr_size); |
a3ad94ed | 864 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
bae7f79e | 865 | |
c1027032 CC |
866 | // If this object has a .eh_frame section, or if building a .gdb_index |
867 | // section and there is debug info, we need all the symbols. | |
730cdc88 ILT |
868 | // Otherwise we only need the external symbols. While it would be |
869 | // simpler to just always read all the symbols, I've seen object | |
870 | // files with well over 2000 local symbols, which for a 64-bit | |
871 | // object file format is over 5 pages that we don't need to read | |
872 | // now. | |
873 | ||
2ea97941 | 874 | const int sym_size = This::sym_size; |
92e059d8 ILT |
875 | const unsigned int loccount = symtabshdr.get_sh_info(); |
876 | this->local_symbol_count_ = loccount; | |
7bf1f802 | 877 | this->local_values_.resize(loccount); |
2ea97941 | 878 | section_offset_type locsize = loccount * sym_size; |
730cdc88 | 879 | off_t dataoff = symtabshdr.get_sh_offset(); |
8383303e ILT |
880 | section_size_type datasize = |
881 | convert_to_section_size_type(symtabshdr.get_sh_size()); | |
730cdc88 | 882 | off_t extoff = dataoff + locsize; |
8383303e | 883 | section_size_type extsize = datasize - locsize; |
75f65a3e | 884 | |
c1027032 CC |
885 | off_t readoff = need_local_symbols ? dataoff : extoff; |
886 | section_size_type readsize = need_local_symbols ? datasize : extsize; | |
730cdc88 | 887 | |
3f2e6a2d CC |
888 | if (readsize == 0) |
889 | { | |
890 | // No external symbols. Also weird but also legal. | |
891 | return; | |
892 | } | |
893 | ||
39d0cb0e | 894 | File_view* fvsymtab = this->get_lasting_view(readoff, readsize, true, false); |
bae7f79e ILT |
895 | |
896 | // Read the section header for the symbol names. | |
d491d34e | 897 | unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link()); |
dbe717ef | 898 | if (strtab_shndx >= this->shnum()) |
bae7f79e | 899 | { |
75f2446e ILT |
900 | this->error(_("invalid symbol table name index: %u"), strtab_shndx); |
901 | return; | |
bae7f79e | 902 | } |
dbe717ef | 903 | typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size); |
bae7f79e ILT |
904 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
905 | { | |
75f2446e ILT |
906 | this->error(_("symbol table name section has wrong type: %u"), |
907 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
908 | return; | |
bae7f79e ILT |
909 | } |
910 | ||
911 | // Read the symbol names. | |
912 | File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), | |
39d0cb0e ILT |
913 | strtabshdr.get_sh_size(), |
914 | false, true); | |
bae7f79e | 915 | |
12e14209 | 916 | sd->symbols = fvsymtab; |
730cdc88 | 917 | sd->symbols_size = readsize; |
c1027032 | 918 | sd->external_symbols_offset = need_local_symbols ? locsize : 0; |
12e14209 | 919 | sd->symbol_names = fvstrtab; |
8383303e ILT |
920 | sd->symbol_names_size = |
921 | convert_to_section_size_type(strtabshdr.get_sh_size()); | |
a2fb1b05 ILT |
922 | } |
923 | ||
730cdc88 | 924 | // Return the section index of symbol SYM. Set *VALUE to its value in |
d491d34e | 925 | // the object file. Set *IS_ORDINARY if this is an ordinary section |
9b547ce6 | 926 | // index, not a special code between SHN_LORESERVE and SHN_HIRESERVE. |
d491d34e ILT |
927 | // Note that for a symbol which is not defined in this object file, |
928 | // this will set *VALUE to 0 and return SHN_UNDEF; it will not return | |
929 | // the final value of the symbol in the link. | |
730cdc88 ILT |
930 | |
931 | template<int size, bool big_endian> | |
932 | unsigned int | |
6fa2a40b CC |
933 | Sized_relobj_file<size, big_endian>::symbol_section_and_value(unsigned int sym, |
934 | Address* value, | |
935 | bool* is_ordinary) | |
730cdc88 | 936 | { |
8383303e | 937 | section_size_type symbols_size; |
730cdc88 ILT |
938 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, |
939 | &symbols_size, | |
940 | false); | |
941 | ||
942 | const size_t count = symbols_size / This::sym_size; | |
943 | gold_assert(sym < count); | |
944 | ||
945 | elfcpp::Sym<size, big_endian> elfsym(symbols + sym * This::sym_size); | |
946 | *value = elfsym.get_st_value(); | |
d491d34e ILT |
947 | |
948 | return this->adjust_sym_shndx(sym, elfsym.get_st_shndx(), is_ordinary); | |
730cdc88 ILT |
949 | } |
950 | ||
a2fb1b05 ILT |
951 | // Return whether to include a section group in the link. LAYOUT is |
952 | // used to keep track of which section groups we have already seen. | |
953 | // INDEX is the index of the section group and SHDR is the section | |
954 | // header. If we do not want to include this group, we set bits in | |
955 | // OMIT for each section which should be discarded. | |
956 | ||
957 | template<int size, bool big_endian> | |
958 | bool | |
6fa2a40b | 959 | Sized_relobj_file<size, big_endian>::include_section_group( |
6a74a719 | 960 | Symbol_table* symtab, |
2ea97941 | 961 | Layout* layout, |
a2fb1b05 | 962 | unsigned int index, |
2ea97941 | 963 | const char* name, |
e94cf127 CC |
964 | const unsigned char* shdrs, |
965 | const char* section_names, | |
966 | section_size_type section_names_size, | |
a2fb1b05 ILT |
967 | std::vector<bool>* omit) |
968 | { | |
969 | // Read the section contents. | |
e94cf127 | 970 | typename This::Shdr shdr(shdrs + index * This::shdr_size); |
a2fb1b05 | 971 | const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), |
39d0cb0e | 972 | shdr.get_sh_size(), true, false); |
a2fb1b05 ILT |
973 | const elfcpp::Elf_Word* pword = |
974 | reinterpret_cast<const elfcpp::Elf_Word*>(pcon); | |
975 | ||
976 | // The first word contains flags. We only care about COMDAT section | |
977 | // groups. Other section groups are always included in the link | |
978 | // just like ordinary sections. | |
f6ce93d6 | 979 | elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword); |
a2fb1b05 | 980 | |
41f9cbbe ILT |
981 | // Look up the group signature, which is the name of a symbol. ELF |
982 | // uses a symbol name because some group signatures are long, and | |
983 | // the name is generally already in the symbol table, so it makes | |
984 | // sense to put the long string just once in .strtab rather than in | |
985 | // both .strtab and .shstrtab. | |
a2fb1b05 ILT |
986 | |
987 | // Get the appropriate symbol table header (this will normally be | |
988 | // the single SHT_SYMTAB section, but in principle it need not be). | |
d491d34e | 989 | const unsigned int link = this->adjust_shndx(shdr.get_sh_link()); |
645f8123 | 990 | typename This::Shdr symshdr(this, this->elf_file_.section_header(link)); |
a2fb1b05 ILT |
991 | |
992 | // Read the symbol table entry. | |
d491d34e ILT |
993 | unsigned int symndx = shdr.get_sh_info(); |
994 | if (symndx >= symshdr.get_sh_size() / This::sym_size) | |
a2fb1b05 | 995 | { |
75f2446e | 996 | this->error(_("section group %u info %u out of range"), |
d491d34e | 997 | index, symndx); |
75f2446e | 998 | return false; |
a2fb1b05 | 999 | } |
d491d34e | 1000 | off_t symoff = symshdr.get_sh_offset() + symndx * This::sym_size; |
39d0cb0e ILT |
1001 | const unsigned char* psym = this->get_view(symoff, This::sym_size, true, |
1002 | false); | |
a2fb1b05 ILT |
1003 | elfcpp::Sym<size, big_endian> sym(psym); |
1004 | ||
a2fb1b05 | 1005 | // Read the symbol table names. |
8383303e | 1006 | section_size_type symnamelen; |
645f8123 | 1007 | const unsigned char* psymnamesu; |
d491d34e ILT |
1008 | psymnamesu = this->section_contents(this->adjust_shndx(symshdr.get_sh_link()), |
1009 | &symnamelen, true); | |
a2fb1b05 ILT |
1010 | const char* psymnames = reinterpret_cast<const char*>(psymnamesu); |
1011 | ||
1012 | // Get the section group signature. | |
645f8123 | 1013 | if (sym.get_st_name() >= symnamelen) |
a2fb1b05 | 1014 | { |
75f2446e | 1015 | this->error(_("symbol %u name offset %u out of range"), |
d491d34e | 1016 | symndx, sym.get_st_name()); |
75f2446e | 1017 | return false; |
a2fb1b05 ILT |
1018 | } |
1019 | ||
e94cf127 | 1020 | std::string signature(psymnames + sym.get_st_name()); |
a2fb1b05 | 1021 | |
ead1e424 ILT |
1022 | // It seems that some versions of gas will create a section group |
1023 | // associated with a section symbol, and then fail to give a name to | |
1024 | // the section symbol. In such a case, use the name of the section. | |
645f8123 | 1025 | if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION) |
ead1e424 | 1026 | { |
d491d34e ILT |
1027 | bool is_ordinary; |
1028 | unsigned int sym_shndx = this->adjust_sym_shndx(symndx, | |
1029 | sym.get_st_shndx(), | |
1030 | &is_ordinary); | |
1031 | if (!is_ordinary || sym_shndx >= this->shnum()) | |
1032 | { | |
1033 | this->error(_("symbol %u invalid section index %u"), | |
1034 | symndx, sym_shndx); | |
1035 | return false; | |
1036 | } | |
e94cf127 CC |
1037 | typename This::Shdr member_shdr(shdrs + sym_shndx * This::shdr_size); |
1038 | if (member_shdr.get_sh_name() < section_names_size) | |
2e702c99 | 1039 | signature = section_names + member_shdr.get_sh_name(); |
ead1e424 ILT |
1040 | } |
1041 | ||
e94cf127 CC |
1042 | // Record this section group in the layout, and see whether we've already |
1043 | // seen one with the same signature. | |
8a4c0b0d | 1044 | bool include_group; |
1ef4d87f ILT |
1045 | bool is_comdat; |
1046 | Kept_section* kept_section = NULL; | |
6a74a719 | 1047 | |
8a4c0b0d | 1048 | if ((flags & elfcpp::GRP_COMDAT) == 0) |
1ef4d87f ILT |
1049 | { |
1050 | include_group = true; | |
1051 | is_comdat = false; | |
1052 | } | |
8a4c0b0d | 1053 | else |
e94cf127 | 1054 | { |
2ea97941 ILT |
1055 | include_group = layout->find_or_add_kept_section(signature, |
1056 | this, index, true, | |
1057 | true, &kept_section); | |
1ef4d87f | 1058 | is_comdat = true; |
6a74a719 | 1059 | } |
a2fb1b05 | 1060 | |
89d8a36b CC |
1061 | if (is_comdat && include_group) |
1062 | { | |
1063 | Incremental_inputs* incremental_inputs = layout->incremental_inputs(); | |
1064 | if (incremental_inputs != NULL) | |
1065 | incremental_inputs->report_comdat_group(this, signature.c_str()); | |
1066 | } | |
1067 | ||
a2fb1b05 | 1068 | size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); |
8825ac63 ILT |
1069 | |
1070 | std::vector<unsigned int> shndxes; | |
1071 | bool relocate_group = include_group && parameters->options().relocatable(); | |
1072 | if (relocate_group) | |
1073 | shndxes.reserve(count - 1); | |
1074 | ||
a2fb1b05 ILT |
1075 | for (size_t i = 1; i < count; ++i) |
1076 | { | |
1ef4d87f | 1077 | elfcpp::Elf_Word shndx = |
8825ac63 ILT |
1078 | this->adjust_shndx(elfcpp::Swap<32, big_endian>::readval(pword + i)); |
1079 | ||
1080 | if (relocate_group) | |
1ef4d87f | 1081 | shndxes.push_back(shndx); |
8825ac63 | 1082 | |
1ef4d87f | 1083 | if (shndx >= this->shnum()) |
a2fb1b05 | 1084 | { |
75f2446e | 1085 | this->error(_("section %u in section group %u out of range"), |
1ef4d87f | 1086 | shndx, index); |
75f2446e | 1087 | continue; |
a2fb1b05 | 1088 | } |
55438702 ILT |
1089 | |
1090 | // Check for an earlier section number, since we're going to get | |
1091 | // it wrong--we may have already decided to include the section. | |
1ef4d87f | 1092 | if (shndx < index) |
2e702c99 RM |
1093 | this->error(_("invalid section group %u refers to earlier section %u"), |
1094 | index, shndx); | |
55438702 | 1095 | |
e94cf127 | 1096 | // Get the name of the member section. |
1ef4d87f | 1097 | typename This::Shdr member_shdr(shdrs + shndx * This::shdr_size); |
e94cf127 | 1098 | if (member_shdr.get_sh_name() >= section_names_size) |
2e702c99 RM |
1099 | { |
1100 | // This is an error, but it will be diagnosed eventually | |
1101 | // in do_layout, so we don't need to do anything here but | |
1102 | // ignore it. | |
1103 | continue; | |
1104 | } | |
e94cf127 CC |
1105 | std::string mname(section_names + member_shdr.get_sh_name()); |
1106 | ||
1ef4d87f ILT |
1107 | if (include_group) |
1108 | { | |
1109 | if (is_comdat) | |
1110 | kept_section->add_comdat_section(mname, shndx, | |
1111 | member_shdr.get_sh_size()); | |
1112 | } | |
1113 | else | |
2e702c99 RM |
1114 | { |
1115 | (*omit)[shndx] = true; | |
1ef4d87f | 1116 | |
43193fe9 CC |
1117 | // Store a mapping from this section to the Kept_section |
1118 | // information for the group. This mapping is used for | |
1119 | // relocation processing and diagnostics. | |
1120 | // If the kept section is a linkonce section, we don't | |
1121 | // bother with it unless the comdat group contains just | |
1122 | // a single section, making it easy to match up. | |
1123 | if (is_comdat | |
1124 | && (kept_section->is_comdat() || count == 2)) | |
1125 | this->set_kept_comdat_section(shndx, true, symndx, | |
1126 | member_shdr.get_sh_size(), | |
1127 | kept_section); | |
2e702c99 | 1128 | } |
a2fb1b05 ILT |
1129 | } |
1130 | ||
8825ac63 | 1131 | if (relocate_group) |
2ea97941 ILT |
1132 | layout->layout_group(symtab, this, index, name, signature.c_str(), |
1133 | shdr, flags, &shndxes); | |
8825ac63 | 1134 | |
e94cf127 | 1135 | return include_group; |
a2fb1b05 ILT |
1136 | } |
1137 | ||
1138 | // Whether to include a linkonce section in the link. NAME is the | |
1139 | // name of the section and SHDR is the section header. | |
1140 | ||
1141 | // Linkonce sections are a GNU extension implemented in the original | |
1142 | // GNU linker before section groups were defined. The semantics are | |
1143 | // that we only include one linkonce section with a given name. The | |
1144 | // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, | |
1145 | // where T is the type of section and SYMNAME is the name of a symbol. | |
1146 | // In an attempt to make linkonce sections interact well with section | |
1147 | // groups, we try to identify SYMNAME and use it like a section group | |
1148 | // signature. We want to block section groups with that signature, | |
1149 | // but not other linkonce sections with that signature. We also use | |
1150 | // the full name of the linkonce section as a normal section group | |
1151 | // signature. | |
1152 | ||
1153 | template<int size, bool big_endian> | |
1154 | bool | |
6fa2a40b | 1155 | Sized_relobj_file<size, big_endian>::include_linkonce_section( |
2ea97941 | 1156 | Layout* layout, |
e94cf127 | 1157 | unsigned int index, |
2ea97941 | 1158 | const char* name, |
1ef4d87f | 1159 | const elfcpp::Shdr<size, big_endian>& shdr) |
a2fb1b05 | 1160 | { |
1ef4d87f | 1161 | typename elfcpp::Elf_types<size>::Elf_WXword sh_size = shdr.get_sh_size(); |
ad435a24 ILT |
1162 | // In general the symbol name we want will be the string following |
1163 | // the last '.'. However, we have to handle the case of | |
1164 | // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by | |
1165 | // some versions of gcc. So we use a heuristic: if the name starts | |
1166 | // with ".gnu.linkonce.t.", we use everything after that. Otherwise | |
1167 | // we look for the last '.'. We can't always simply skip | |
1168 | // ".gnu.linkonce.X", because we have to deal with cases like | |
1169 | // ".gnu.linkonce.d.rel.ro.local". | |
1170 | const char* const linkonce_t = ".gnu.linkonce.t."; | |
1171 | const char* symname; | |
2ea97941 ILT |
1172 | if (strncmp(name, linkonce_t, strlen(linkonce_t)) == 0) |
1173 | symname = name + strlen(linkonce_t); | |
ad435a24 | 1174 | else |
2ea97941 | 1175 | symname = strrchr(name, '.') + 1; |
e94cf127 | 1176 | std::string sig1(symname); |
2ea97941 | 1177 | std::string sig2(name); |
8a4c0b0d ILT |
1178 | Kept_section* kept1; |
1179 | Kept_section* kept2; | |
2ea97941 ILT |
1180 | bool include1 = layout->find_or_add_kept_section(sig1, this, index, false, |
1181 | false, &kept1); | |
1182 | bool include2 = layout->find_or_add_kept_section(sig2, this, index, false, | |
1183 | true, &kept2); | |
e94cf127 CC |
1184 | |
1185 | if (!include2) | |
1186 | { | |
1ef4d87f ILT |
1187 | // We are not including this section because we already saw the |
1188 | // name of the section as a signature. This normally implies | |
1189 | // that the kept section is another linkonce section. If it is | |
1190 | // the same size, record it as the section which corresponds to | |
1191 | // this one. | |
43193fe9 CC |
1192 | if (kept2->object() != NULL && !kept2->is_comdat()) |
1193 | this->set_kept_comdat_section(index, false, 0, sh_size, kept2); | |
e94cf127 CC |
1194 | } |
1195 | else if (!include1) | |
1196 | { | |
1197 | // The section is being discarded on the basis of its symbol | |
1198 | // name. This means that the corresponding kept section was | |
1199 | // part of a comdat group, and it will be difficult to identify | |
1200 | // the specific section within that group that corresponds to | |
1201 | // this linkonce section. We'll handle the simple case where | |
1202 | // the group has only one member section. Otherwise, it's not | |
1203 | // worth the effort. | |
43193fe9 CC |
1204 | if (kept1->object() != NULL && kept1->is_comdat()) |
1205 | this->set_kept_comdat_section(index, false, 0, sh_size, kept1); | |
1ef4d87f ILT |
1206 | } |
1207 | else | |
1208 | { | |
1209 | kept1->set_linkonce_size(sh_size); | |
1210 | kept2->set_linkonce_size(sh_size); | |
e94cf127 CC |
1211 | } |
1212 | ||
a783673b | 1213 | return include1 && include2; |
a2fb1b05 ILT |
1214 | } |
1215 | ||
5995b570 CC |
1216 | // Layout an input section. |
1217 | ||
1218 | template<int size, bool big_endian> | |
1219 | inline void | |
14788a3f ILT |
1220 | Sized_relobj_file<size, big_endian>::layout_section( |
1221 | Layout* layout, | |
1222 | unsigned int shndx, | |
1223 | const char* name, | |
1224 | const typename This::Shdr& shdr, | |
bce5a025 | 1225 | unsigned int sh_type, |
14788a3f ILT |
1226 | unsigned int reloc_shndx, |
1227 | unsigned int reloc_type) | |
5995b570 | 1228 | { |
2ea97941 | 1229 | off_t offset; |
bce5a025 CC |
1230 | Output_section* os = layout->layout(this, shndx, name, shdr, sh_type, |
1231 | reloc_shndx, reloc_type, &offset); | |
5995b570 CC |
1232 | |
1233 | this->output_sections()[shndx] = os; | |
2ea97941 | 1234 | if (offset == -1) |
6fa2a40b | 1235 | this->section_offsets()[shndx] = invalid_address; |
5995b570 | 1236 | else |
6fa2a40b | 1237 | this->section_offsets()[shndx] = convert_types<Address, off_t>(offset); |
5995b570 CC |
1238 | |
1239 | // If this section requires special handling, and if there are | |
1240 | // relocs that apply to it, then we must do the special handling | |
1241 | // before we apply the relocs. | |
2ea97941 | 1242 | if (offset == -1 && reloc_shndx != 0) |
5995b570 CC |
1243 | this->set_relocs_must_follow_section_writes(); |
1244 | } | |
1245 | ||
14788a3f ILT |
1246 | // Layout an input .eh_frame section. |
1247 | ||
1248 | template<int size, bool big_endian> | |
1249 | void | |
1250 | Sized_relobj_file<size, big_endian>::layout_eh_frame_section( | |
1251 | Layout* layout, | |
1252 | const unsigned char* symbols_data, | |
1253 | section_size_type symbols_size, | |
1254 | const unsigned char* symbol_names_data, | |
1255 | section_size_type symbol_names_size, | |
1256 | unsigned int shndx, | |
1257 | const typename This::Shdr& shdr, | |
1258 | unsigned int reloc_shndx, | |
1259 | unsigned int reloc_type) | |
1260 | { | |
1261 | gold_assert(this->has_eh_frame_); | |
1262 | ||
1263 | off_t offset; | |
1264 | Output_section* os = layout->layout_eh_frame(this, | |
1265 | symbols_data, | |
1266 | symbols_size, | |
1267 | symbol_names_data, | |
1268 | symbol_names_size, | |
1269 | shndx, | |
1270 | shdr, | |
1271 | reloc_shndx, | |
1272 | reloc_type, | |
1273 | &offset); | |
1274 | this->output_sections()[shndx] = os; | |
1275 | if (os == NULL || offset == -1) | |
8de0e07b | 1276 | this->section_offsets()[shndx] = invalid_address; |
14788a3f ILT |
1277 | else |
1278 | this->section_offsets()[shndx] = convert_types<Address, off_t>(offset); | |
1279 | ||
1280 | // If this section requires special handling, and if there are | |
1281 | // relocs that aply to it, then we must do the special handling | |
1282 | // before we apply the relocs. | |
1283 | if (os != NULL && offset == -1 && reloc_shndx != 0) | |
1284 | this->set_relocs_must_follow_section_writes(); | |
1285 | } | |
1286 | ||
6c04fd9b CC |
1287 | // Layout an input .note.gnu.property section. |
1288 | ||
1289 | // This note section has an *extremely* non-standard layout. | |
1290 | // The gABI spec says that ELF-64 files should have 8-byte fields and | |
1291 | // 8-byte alignment in the note section, but the Gnu tools generally | |
1292 | // use 4-byte fields and 4-byte alignment (see the comment for | |
1293 | // Layout::create_note). This section uses 4-byte fields (i.e., | |
1294 | // namesz, descsz, and type are always 4 bytes), the name field is | |
1295 | // padded to a multiple of 4 bytes, but the desc field is padded | |
1296 | // to a multiple of 4 or 8 bytes, depending on the ELF class. | |
1297 | // The individual properties within the desc field always use | |
1298 | // 4-byte pr_type and pr_datasz fields, but pr_data is padded to | |
1299 | // a multiple of 4 or 8 bytes, depending on the ELF class. | |
1300 | ||
1301 | template<int size, bool big_endian> | |
1302 | void | |
1303 | Sized_relobj_file<size, big_endian>::layout_gnu_property_section( | |
1304 | Layout* layout, | |
1305 | unsigned int shndx) | |
1306 | { | |
1307 | section_size_type contents_len; | |
1308 | const unsigned char* pcontents = this->section_contents(shndx, | |
1309 | &contents_len, | |
1310 | false); | |
1311 | const unsigned char* pcontents_end = pcontents + contents_len; | |
1312 | ||
1313 | // Loop over all the notes in this section. | |
1314 | while (pcontents < pcontents_end) | |
1315 | { | |
1316 | if (pcontents + 16 > pcontents_end) | |
1317 | { | |
1318 | gold_warning(_("%s: corrupt .note.gnu.property section " | |
1319 | "(note too short)"), | |
1320 | this->name().c_str()); | |
1321 | return; | |
1322 | } | |
1323 | ||
1324 | size_t namesz = elfcpp::Swap<32, big_endian>::readval(pcontents); | |
1325 | size_t descsz = elfcpp::Swap<32, big_endian>::readval(pcontents + 4); | |
1326 | unsigned int ntype = elfcpp::Swap<32, big_endian>::readval(pcontents + 8); | |
1327 | const unsigned char* pname = pcontents + 12; | |
1328 | ||
1329 | if (namesz != 4 || strcmp(reinterpret_cast<const char*>(pname), "GNU") != 0) | |
1330 | { | |
1331 | gold_warning(_("%s: corrupt .note.gnu.property section " | |
1332 | "(name is not 'GNU')"), | |
1333 | this->name().c_str()); | |
1334 | return; | |
1335 | } | |
1336 | ||
1337 | if (ntype != elfcpp::NT_GNU_PROPERTY_TYPE_0) | |
1338 | { | |
1339 | gold_warning(_("%s: unsupported note type %d " | |
1340 | "in .note.gnu.property section"), | |
1341 | this->name().c_str(), ntype); | |
1342 | return; | |
1343 | } | |
1344 | ||
1345 | size_t aligned_namesz = align_address(namesz, 4); | |
1346 | const unsigned char* pdesc = pname + aligned_namesz; | |
1347 | ||
1348 | if (pdesc + descsz > pcontents + contents_len) | |
1349 | { | |
1350 | gold_warning(_("%s: corrupt .note.gnu.property section"), | |
1351 | this->name().c_str()); | |
1352 | return; | |
1353 | } | |
1354 | ||
1355 | const unsigned char* pprop = pdesc; | |
1356 | ||
1357 | // Loop over the program properties in this note. | |
1358 | while (pprop < pdesc + descsz) | |
1359 | { | |
1360 | if (pprop + 8 > pdesc + descsz) | |
1361 | { | |
1362 | gold_warning(_("%s: corrupt .note.gnu.property section"), | |
1363 | this->name().c_str()); | |
1364 | return; | |
1365 | } | |
1366 | unsigned int pr_type = elfcpp::Swap<32, big_endian>::readval(pprop); | |
1367 | size_t pr_datasz = elfcpp::Swap<32, big_endian>::readval(pprop + 4); | |
1368 | pprop += 8; | |
1369 | if (pprop + pr_datasz > pdesc + descsz) | |
1370 | { | |
1371 | gold_warning(_("%s: corrupt .note.gnu.property section"), | |
1372 | this->name().c_str()); | |
1373 | return; | |
1374 | } | |
1375 | layout->layout_gnu_property(ntype, pr_type, pr_datasz, pprop, this); | |
1376 | pprop += align_address(pr_datasz, size / 8); | |
1377 | } | |
1378 | ||
1379 | pcontents = pdesc + align_address(descsz, size / 8); | |
1380 | } | |
1381 | } | |
1382 | ||
cc5277b1 ML |
1383 | // This a copy of lto_section defined in GCC (lto-streamer.h) |
1384 | ||
1385 | struct lto_section | |
1386 | { | |
1387 | int16_t major_version; | |
1388 | int16_t minor_version; | |
1389 | unsigned char slim_object; | |
1390 | ||
1391 | /* Flags is a private field that is not defined publicly. */ | |
1392 | uint16_t flags; | |
1393 | }; | |
1394 | ||
a2fb1b05 ILT |
1395 | // Lay out the input sections. We walk through the sections and check |
1396 | // whether they should be included in the link. If they should, we | |
1397 | // pass them to the Layout object, which will return an output section | |
2e702c99 | 1398 | // and an offset. |
16164a6b ST |
1399 | // This function is called twice sometimes, two passes, when mapping |
1400 | // of input sections to output sections must be delayed. | |
1401 | // This is true for the following : | |
1402 | // * Garbage collection (--gc-sections): Some input sections will be | |
1403 | // discarded and hence the assignment must wait until the second pass. | |
1404 | // In the first pass, it is for setting up some sections as roots to | |
1405 | // a work-list for --gc-sections and to do comdat processing. | |
1406 | // * Identical Code Folding (--icf=<safe,all>): Some input sections | |
1407 | // will be folded and hence the assignment must wait. | |
1408 | // * Using plugins to map some sections to unique segments: Mapping | |
1409 | // some sections to unique segments requires mapping them to unique | |
1410 | // output sections too. This can be done via plugins now and this | |
1411 | // information is not available in the first pass. | |
a2fb1b05 ILT |
1412 | |
1413 | template<int size, bool big_endian> | |
1414 | void | |
6fa2a40b CC |
1415 | Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab, |
1416 | Layout* layout, | |
1417 | Read_symbols_data* sd) | |
a2fb1b05 | 1418 | { |
bce5a025 CC |
1419 | const unsigned int unwind_section_type = |
1420 | parameters->target().unwind_section_type(); | |
2ea97941 | 1421 | const unsigned int shnum = this->shnum(); |
2e702c99 | 1422 | |
16164a6b ST |
1423 | /* Should this function be called twice? */ |
1424 | bool is_two_pass = (parameters->options().gc_sections() | |
1425 | || parameters->options().icf_enabled() | |
1426 | || layout->is_unique_segment_for_sections_specified()); | |
ef15dade | 1427 | |
16164a6b ST |
1428 | /* Only one of is_pass_one and is_pass_two is true. Both are false when |
1429 | a two-pass approach is not needed. */ | |
1430 | bool is_pass_one = false; | |
1431 | bool is_pass_two = false; | |
ef15dade | 1432 | |
16164a6b | 1433 | Symbols_data* gc_sd = NULL; |
ef15dade | 1434 | |
16164a6b ST |
1435 | /* Check if do_layout needs to be two-pass. If so, find out which pass |
1436 | should happen. In the first pass, the data in sd is saved to be used | |
1437 | later in the second pass. */ | |
1438 | if (is_two_pass) | |
1439 | { | |
1440 | gc_sd = this->get_symbols_data(); | |
1441 | if (gc_sd == NULL) | |
1442 | { | |
1443 | gold_assert(sd != NULL); | |
1444 | is_pass_one = true; | |
1445 | } | |
1446 | else | |
1447 | { | |
1448 | if (parameters->options().gc_sections()) | |
1449 | gold_assert(symtab->gc()->is_worklist_ready()); | |
1450 | if (parameters->options().icf_enabled()) | |
1451 | gold_assert(symtab->icf()->is_icf_ready()); | |
1452 | is_pass_two = true; | |
1453 | } | |
1454 | } | |
1455 | ||
2ea97941 | 1456 | if (shnum == 0) |
12e14209 | 1457 | return; |
16164a6b ST |
1458 | |
1459 | if (is_pass_one) | |
6d03d481 | 1460 | { |
2e702c99 RM |
1461 | // During garbage collection save the symbols data to use it when |
1462 | // re-entering this function. | |
6d03d481 | 1463 | gc_sd = new Symbols_data; |
2ea97941 | 1464 | this->copy_symbols_data(gc_sd, sd, This::shdr_size * shnum); |
6d03d481 ST |
1465 | this->set_symbols_data(gc_sd); |
1466 | } | |
6d03d481 ST |
1467 | |
1468 | const unsigned char* section_headers_data = NULL; | |
1469 | section_size_type section_names_size; | |
1470 | const unsigned char* symbols_data = NULL; | |
1471 | section_size_type symbols_size; | |
6d03d481 ST |
1472 | const unsigned char* symbol_names_data = NULL; |
1473 | section_size_type symbol_names_size; | |
2e702c99 | 1474 | |
16164a6b | 1475 | if (is_two_pass) |
6d03d481 ST |
1476 | { |
1477 | section_headers_data = gc_sd->section_headers_data; | |
1478 | section_names_size = gc_sd->section_names_size; | |
1479 | symbols_data = gc_sd->symbols_data; | |
1480 | symbols_size = gc_sd->symbols_size; | |
6d03d481 ST |
1481 | symbol_names_data = gc_sd->symbol_names_data; |
1482 | symbol_names_size = gc_sd->symbol_names_size; | |
1483 | } | |
1484 | else | |
1485 | { | |
1486 | section_headers_data = sd->section_headers->data(); | |
1487 | section_names_size = sd->section_names_size; | |
1488 | if (sd->symbols != NULL) | |
2e702c99 | 1489 | symbols_data = sd->symbols->data(); |
6d03d481 | 1490 | symbols_size = sd->symbols_size; |
6d03d481 | 1491 | if (sd->symbol_names != NULL) |
2e702c99 | 1492 | symbol_names_data = sd->symbol_names->data(); |
6d03d481 ST |
1493 | symbol_names_size = sd->symbol_names_size; |
1494 | } | |
a2fb1b05 ILT |
1495 | |
1496 | // Get the section headers. | |
6d03d481 | 1497 | const unsigned char* shdrs = section_headers_data; |
e94cf127 | 1498 | const unsigned char* pshdrs; |
a2fb1b05 ILT |
1499 | |
1500 | // Get the section names. | |
16164a6b ST |
1501 | const unsigned char* pnamesu = (is_two_pass |
1502 | ? gc_sd->section_names_data | |
1503 | : sd->section_names->data()); | |
ef15dade | 1504 | |
a2fb1b05 ILT |
1505 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
1506 | ||
5995b570 CC |
1507 | // If any input files have been claimed by plugins, we need to defer |
1508 | // actual layout until the replacement files have arrived. | |
1509 | const bool should_defer_layout = | |
1510 | (parameters->options().has_plugins() | |
1511 | && parameters->options().plugins()->should_defer_layout()); | |
1512 | unsigned int num_sections_to_defer = 0; | |
1513 | ||
730cdc88 ILT |
1514 | // For each section, record the index of the reloc section if any. |
1515 | // Use 0 to mean that there is no reloc section, -1U to mean that | |
1516 | // there is more than one. | |
2ea97941 ILT |
1517 | std::vector<unsigned int> reloc_shndx(shnum, 0); |
1518 | std::vector<unsigned int> reloc_type(shnum, elfcpp::SHT_NULL); | |
730cdc88 | 1519 | // Skip the first, dummy, section. |
e94cf127 | 1520 | pshdrs = shdrs + This::shdr_size; |
2ea97941 | 1521 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
730cdc88 ILT |
1522 | { |
1523 | typename This::Shdr shdr(pshdrs); | |
1524 | ||
5995b570 CC |
1525 | // Count the number of sections whose layout will be deferred. |
1526 | if (should_defer_layout && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) | |
2e702c99 | 1527 | ++num_sections_to_defer; |
5995b570 | 1528 | |
730cdc88 ILT |
1529 | unsigned int sh_type = shdr.get_sh_type(); |
1530 | if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA) | |
1531 | { | |
d491d34e | 1532 | unsigned int target_shndx = this->adjust_shndx(shdr.get_sh_info()); |
2ea97941 | 1533 | if (target_shndx == 0 || target_shndx >= shnum) |
730cdc88 ILT |
1534 | { |
1535 | this->error(_("relocation section %u has bad info %u"), | |
1536 | i, target_shndx); | |
1537 | continue; | |
1538 | } | |
1539 | ||
1540 | if (reloc_shndx[target_shndx] != 0) | |
1541 | reloc_shndx[target_shndx] = -1U; | |
1542 | else | |
1543 | { | |
1544 | reloc_shndx[target_shndx] = i; | |
1545 | reloc_type[target_shndx] = sh_type; | |
1546 | } | |
1547 | } | |
1548 | } | |
1549 | ||
ef9beddf | 1550 | Output_sections& out_sections(this->output_sections()); |
6fa2a40b | 1551 | std::vector<Address>& out_section_offsets(this->section_offsets()); |
ef9beddf | 1552 | |
16164a6b | 1553 | if (!is_pass_two) |
6d03d481 | 1554 | { |
2ea97941 ILT |
1555 | out_sections.resize(shnum); |
1556 | out_section_offsets.resize(shnum); | |
6d03d481 | 1557 | } |
a2fb1b05 | 1558 | |
88dd47ac ILT |
1559 | // If we are only linking for symbols, then there is nothing else to |
1560 | // do here. | |
1561 | if (this->input_file()->just_symbols()) | |
1562 | { | |
16164a6b | 1563 | if (!is_pass_two) |
2e702c99 RM |
1564 | { |
1565 | delete sd->section_headers; | |
1566 | sd->section_headers = NULL; | |
1567 | delete sd->section_names; | |
1568 | sd->section_names = NULL; | |
1569 | } | |
88dd47ac ILT |
1570 | return; |
1571 | } | |
1572 | ||
5995b570 CC |
1573 | if (num_sections_to_defer > 0) |
1574 | { | |
1575 | parameters->options().plugins()->add_deferred_layout_object(this); | |
1576 | this->deferred_layout_.reserve(num_sections_to_defer); | |
c924eb67 | 1577 | this->is_deferred_layout_ = true; |
5995b570 CC |
1578 | } |
1579 | ||
35cdfc9a ILT |
1580 | // Whether we've seen a .note.GNU-stack section. |
1581 | bool seen_gnu_stack = false; | |
1582 | // The flags of a .note.GNU-stack section. | |
1583 | uint64_t gnu_stack_flags = 0; | |
1584 | ||
a2fb1b05 | 1585 | // Keep track of which sections to omit. |
2ea97941 | 1586 | std::vector<bool> omit(shnum, false); |
a2fb1b05 | 1587 | |
7019cd25 | 1588 | // Keep track of reloc sections when emitting relocations. |
8851ecca | 1589 | const bool relocatable = parameters->options().relocatable(); |
2ea97941 ILT |
1590 | const bool emit_relocs = (relocatable |
1591 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
1592 | std::vector<unsigned int> reloc_sections; |
1593 | ||
730cdc88 ILT |
1594 | // Keep track of .eh_frame sections. |
1595 | std::vector<unsigned int> eh_frame_sections; | |
1596 | ||
c1027032 CC |
1597 | // Keep track of .debug_info and .debug_types sections. |
1598 | std::vector<unsigned int> debug_info_sections; | |
1599 | std::vector<unsigned int> debug_types_sections; | |
1600 | ||
f6ce93d6 | 1601 | // Skip the first, dummy, section. |
e94cf127 | 1602 | pshdrs = shdrs + This::shdr_size; |
2ea97941 | 1603 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
a2fb1b05 | 1604 | { |
75f65a3e | 1605 | typename This::Shdr shdr(pshdrs); |
bce5a025 CC |
1606 | const unsigned int sh_name = shdr.get_sh_name(); |
1607 | unsigned int sh_type = shdr.get_sh_type(); | |
a2fb1b05 | 1608 | |
bce5a025 | 1609 | if (sh_name >= section_names_size) |
a2fb1b05 | 1610 | { |
75f2446e | 1611 | this->error(_("bad section name offset for section %u: %lu"), |
bce5a025 | 1612 | i, static_cast<unsigned long>(sh_name)); |
75f2446e | 1613 | return; |
a2fb1b05 ILT |
1614 | } |
1615 | ||
bce5a025 | 1616 | const char* name = pnames + sh_name; |
a2fb1b05 | 1617 | |
16164a6b | 1618 | if (!is_pass_two) |
2e702c99 RM |
1619 | { |
1620 | if (this->handle_gnu_warning_section(name, i, symtab)) | |
1621 | { | |
1622 | if (!relocatable && !parameters->options().shared()) | |
1623 | omit[i] = true; | |
6d03d481 | 1624 | } |
f6ce93d6 | 1625 | |
2e702c99 RM |
1626 | // The .note.GNU-stack section is special. It gives the |
1627 | // protection flags that this object file requires for the stack | |
1628 | // in memory. | |
1629 | if (strcmp(name, ".note.GNU-stack") == 0) | |
1630 | { | |
6d03d481 ST |
1631 | seen_gnu_stack = true; |
1632 | gnu_stack_flags |= shdr.get_sh_flags(); | |
1633 | omit[i] = true; | |
2e702c99 | 1634 | } |
35cdfc9a | 1635 | |
364c7fa5 ILT |
1636 | // The .note.GNU-split-stack section is also special. It |
1637 | // indicates that the object was compiled with | |
1638 | // -fsplit-stack. | |
2ea97941 | 1639 | if (this->handle_split_stack_section(name)) |
364c7fa5 | 1640 | { |
e588ea8d | 1641 | if (!relocatable && !parameters->options().shared()) |
364c7fa5 ILT |
1642 | omit[i] = true; |
1643 | } | |
1644 | ||
05a352e6 | 1645 | // Skip attributes section. |
2ea97941 | 1646 | if (parameters->target().is_attributes_section(name)) |
05a352e6 DK |
1647 | { |
1648 | omit[i] = true; | |
6c04fd9b CC |
1649 | } |
1650 | ||
1651 | // Handle .note.gnu.property sections. | |
1652 | if (sh_type == elfcpp::SHT_NOTE | |
1653 | && strcmp(name, ".note.gnu.property") == 0) | |
1654 | { | |
1655 | this->layout_gnu_property_section(layout, i); | |
1656 | omit[i] = true; | |
05a352e6 DK |
1657 | } |
1658 | ||
2e702c99 RM |
1659 | bool discard = omit[i]; |
1660 | if (!discard) | |
1661 | { | |
bce5a025 | 1662 | if (sh_type == elfcpp::SHT_GROUP) |
2e702c99 RM |
1663 | { |
1664 | if (!this->include_section_group(symtab, layout, i, name, | |
1665 | shdrs, pnames, | |
1666 | section_names_size, | |
1667 | &omit)) | |
1668 | discard = true; | |
1669 | } | |
1670 | else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0 | |
1671 | && Layout::is_linkonce(name)) | |
1672 | { | |
1673 | if (!this->include_linkonce_section(layout, i, name, shdr)) | |
6d03d481 | 1674 | discard = true; |
2e702c99 | 1675 | } |
a2fb1b05 | 1676 | } |
a2fb1b05 | 1677 | |
09ec0418 CC |
1678 | // Add the section to the incremental inputs layout. |
1679 | Incremental_inputs* incremental_inputs = layout->incremental_inputs(); | |
cdc29364 CC |
1680 | if (incremental_inputs != NULL |
1681 | && !discard | |
bce5a025 | 1682 | && can_incremental_update(sh_type)) |
4fb3a1c3 CC |
1683 | { |
1684 | off_t sh_size = shdr.get_sh_size(); | |
1685 | section_size_type uncompressed_size; | |
1686 | if (this->section_is_compressed(i, &uncompressed_size)) | |
1687 | sh_size = uncompressed_size; | |
1688 | incremental_inputs->report_input_section(this, i, name, sh_size); | |
1689 | } | |
09ec0418 | 1690 | |
2e702c99 RM |
1691 | if (discard) |
1692 | { | |
6d03d481 ST |
1693 | // Do not include this section in the link. |
1694 | out_sections[i] = NULL; | |
2e702c99 | 1695 | out_section_offsets[i] = invalid_address; |
6d03d481 | 1696 | continue; |
2e702c99 RM |
1697 | } |
1698 | } | |
1699 | ||
16164a6b | 1700 | if (is_pass_one && parameters->options().gc_sections()) |
2e702c99 RM |
1701 | { |
1702 | if (this->is_section_name_included(name) | |
b9b2ae8b | 1703 | || layout->keep_input_section (this, name) |
bce5a025 CC |
1704 | || sh_type == elfcpp::SHT_INIT_ARRAY |
1705 | || sh_type == elfcpp::SHT_FINI_ARRAY) | |
2e702c99 | 1706 | { |
4277535c | 1707 | symtab->gc()->worklist().push_back(Section_id(this, i)); |
2e702c99 RM |
1708 | } |
1709 | // If the section name XXX can be represented as a C identifier | |
1710 | // it cannot be discarded if there are references to | |
1711 | // __start_XXX and __stop_XXX symbols. These need to be | |
1712 | // specially handled. | |
1713 | if (is_cident(name)) | |
1714 | { | |
1715 | symtab->gc()->add_cident_section(name, Section_id(this, i)); | |
1716 | } | |
1717 | } | |
a2fb1b05 | 1718 | |
6a74a719 ILT |
1719 | // When doing a relocatable link we are going to copy input |
1720 | // reloc sections into the output. We only want to copy the | |
1721 | // ones associated with sections which are not being discarded. | |
1722 | // However, we don't know that yet for all sections. So save | |
6d03d481 ST |
1723 | // reloc sections and process them later. Garbage collection is |
1724 | // not triggered when relocatable code is desired. | |
2ea97941 | 1725 | if (emit_relocs |
bce5a025 CC |
1726 | && (sh_type == elfcpp::SHT_REL |
1727 | || sh_type == elfcpp::SHT_RELA)) | |
6a74a719 ILT |
1728 | { |
1729 | reloc_sections.push_back(i); | |
1730 | continue; | |
1731 | } | |
1732 | ||
bce5a025 | 1733 | if (relocatable && sh_type == elfcpp::SHT_GROUP) |
6a74a719 ILT |
1734 | continue; |
1735 | ||
730cdc88 ILT |
1736 | // The .eh_frame section is special. It holds exception frame |
1737 | // information that we need to read in order to generate the | |
1738 | // exception frame header. We process these after all the other | |
1739 | // sections so that the exception frame reader can reliably | |
1740 | // determine which sections are being discarded, and discard the | |
1741 | // corresponding information. | |
bce5a025 CC |
1742 | if (this->check_eh_frame_flags(&shdr) |
1743 | && strcmp(name, ".eh_frame") == 0) | |
2e702c99 | 1744 | { |
bce5a025 CC |
1745 | // If the target has a special unwind section type, let's |
1746 | // canonicalize it here. | |
1747 | sh_type = unwind_section_type; | |
1748 | if (!relocatable) | |
2e702c99 | 1749 | { |
bce5a025 CC |
1750 | if (is_pass_one) |
1751 | { | |
1752 | if (this->is_deferred_layout()) | |
1753 | out_sections[i] = reinterpret_cast<Output_section*>(2); | |
1754 | else | |
1755 | out_sections[i] = reinterpret_cast<Output_section*>(1); | |
1756 | out_section_offsets[i] = invalid_address; | |
1757 | } | |
1758 | else if (this->is_deferred_layout()) | |
1074bc6d CC |
1759 | { |
1760 | out_sections[i] = reinterpret_cast<Output_section*>(2); | |
1761 | out_section_offsets[i] = invalid_address; | |
1762 | this->deferred_layout_.push_back( | |
1763 | Deferred_layout(i, name, sh_type, pshdrs, | |
1764 | reloc_shndx[i], reloc_type[i])); | |
1765 | } | |
c924eb67 | 1766 | else |
bce5a025 CC |
1767 | eh_frame_sections.push_back(i); |
1768 | continue; | |
2e702c99 | 1769 | } |
2e702c99 | 1770 | } |
730cdc88 | 1771 | |
16164a6b | 1772 | if (is_pass_two && parameters->options().gc_sections()) |
2e702c99 RM |
1773 | { |
1774 | // This is executed during the second pass of garbage | |
1775 | // collection. do_layout has been called before and some | |
1776 | // sections have been already discarded. Simply ignore | |
1777 | // such sections this time around. | |
1778 | if (out_sections[i] == NULL) | |
1779 | { | |
1780 | gold_assert(out_section_offsets[i] == invalid_address); | |
1781 | continue; | |
1782 | } | |
1783 | if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) | |
1784 | && symtab->gc()->is_section_garbage(this, i)) | |
1785 | { | |
1786 | if (parameters->options().print_gc_sections()) | |
1787 | gold_info(_("%s: removing unused section from '%s'" | |
1788 | " in file '%s'"), | |
1789 | program_name, this->section_name(i).c_str(), | |
1790 | this->name().c_str()); | |
1791 | out_sections[i] = NULL; | |
1792 | out_section_offsets[i] = invalid_address; | |
1793 | continue; | |
1794 | } | |
1795 | } | |
ef15dade | 1796 | |
16164a6b | 1797 | if (is_pass_two && parameters->options().icf_enabled()) |
2e702c99 RM |
1798 | { |
1799 | if (out_sections[i] == NULL) | |
1800 | { | |
1801 | gold_assert(out_section_offsets[i] == invalid_address); | |
1802 | continue; | |
1803 | } | |
1804 | if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) | |
1805 | && symtab->icf()->is_section_folded(this, i)) | |
1806 | { | |
1807 | if (parameters->options().print_icf_sections()) | |
1808 | { | |
1809 | Section_id folded = | |
1810 | symtab->icf()->get_folded_section(this, i); | |
1811 | Relobj* folded_obj = | |
1812 | reinterpret_cast<Relobj*>(folded.first); | |
53c66605 | 1813 | gold_info(_("%s: ICF folding section '%s' in file '%s' " |
2e702c99 RM |
1814 | "into '%s' in file '%s'"), |
1815 | program_name, this->section_name(i).c_str(), | |
1816 | this->name().c_str(), | |
1817 | folded_obj->section_name(folded.second).c_str(), | |
1818 | folded_obj->name().c_str()); | |
1819 | } | |
1820 | out_sections[i] = NULL; | |
1821 | out_section_offsets[i] = invalid_address; | |
1822 | continue; | |
1823 | } | |
1824 | } | |
ef15dade | 1825 | |
6d03d481 | 1826 | // Defer layout here if input files are claimed by plugins. When gc |
c924eb67 CC |
1827 | // is turned on this function is called twice; we only want to do this |
1828 | // on the first pass. | |
1829 | if (!is_pass_two | |
1830 | && this->is_deferred_layout() | |
1831 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) | |
2e702c99 | 1832 | { |
bce5a025 | 1833 | this->deferred_layout_.push_back(Deferred_layout(i, name, sh_type, |
2e702c99 RM |
1834 | pshdrs, |
1835 | reloc_shndx[i], | |
1836 | reloc_type[i])); | |
1837 | // Put dummy values here; real values will be supplied by | |
1838 | // do_layout_deferred_sections. | |
1839 | out_sections[i] = reinterpret_cast<Output_section*>(2); | |
1840 | out_section_offsets[i] = invalid_address; | |
1841 | continue; | |
1842 | } | |
ef15dade | 1843 | |
6d03d481 ST |
1844 | // During gc_pass_two if a section that was previously deferred is |
1845 | // found, do not layout the section as layout_deferred_sections will | |
1846 | // do it later from gold.cc. | |
16164a6b | 1847 | if (is_pass_two |
2e702c99 RM |
1848 | && (out_sections[i] == reinterpret_cast<Output_section*>(2))) |
1849 | continue; | |
6d03d481 | 1850 | |
16164a6b | 1851 | if (is_pass_one) |
2e702c99 RM |
1852 | { |
1853 | // This is during garbage collection. The out_sections are | |
1854 | // assigned in the second call to this function. | |
1855 | out_sections[i] = reinterpret_cast<Output_section*>(1); | |
1856 | out_section_offsets[i] = invalid_address; | |
1857 | } | |
ef9beddf | 1858 | else |
2e702c99 RM |
1859 | { |
1860 | // When garbage collection is switched on the actual layout | |
1861 | // only happens in the second call. | |
bce5a025 | 1862 | this->layout_section(layout, i, name, shdr, sh_type, reloc_shndx[i], |
2e702c99 | 1863 | reloc_type[i]); |
c1027032 CC |
1864 | |
1865 | // When generating a .gdb_index section, we do additional | |
1866 | // processing of .debug_info and .debug_types sections after all | |
1867 | // the other sections for the same reason as above. | |
1868 | if (!relocatable | |
1869 | && parameters->options().gdb_index() | |
1870 | && !(shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) | |
1871 | { | |
1872 | if (strcmp(name, ".debug_info") == 0 | |
1873 | || strcmp(name, ".zdebug_info") == 0) | |
1874 | debug_info_sections.push_back(i); | |
1875 | else if (strcmp(name, ".debug_types") == 0 | |
1876 | || strcmp(name, ".zdebug_types") == 0) | |
1877 | debug_types_sections.push_back(i); | |
1878 | } | |
2e702c99 | 1879 | } |
cc5277b1 ML |
1880 | |
1881 | /* GCC uses .gnu.lto_.lto.<some_hash> as a LTO bytecode information | |
1882 | section. */ | |
1883 | const char *lto_section_name = ".gnu.lto_.lto."; | |
1884 | if (strncmp (name, lto_section_name, strlen (lto_section_name)) == 0) | |
1885 | { | |
1886 | section_size_type contents_len; | |
4c51daca AM |
1887 | const unsigned char* pcontents |
1888 | = this->section_contents(i, &contents_len, false); | |
1889 | if (contents_len >= sizeof(lto_section)) | |
1890 | { | |
1891 | const lto_section* lsection | |
1892 | = reinterpret_cast<const lto_section*>(pcontents); | |
1893 | if (lsection->slim_object) | |
1894 | layout->set_lto_slim_object(); | |
1895 | } | |
cc5277b1 | 1896 | } |
12e14209 ILT |
1897 | } |
1898 | ||
16164a6b | 1899 | if (!is_pass_two) |
a2575bec CC |
1900 | { |
1901 | layout->merge_gnu_properties(this); | |
1902 | layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags, this); | |
1903 | } | |
35cdfc9a | 1904 | |
1d946cb3 CC |
1905 | // Handle the .eh_frame sections after the other sections. |
1906 | gold_assert(!is_pass_one || eh_frame_sections.empty()); | |
1907 | for (std::vector<unsigned int>::const_iterator p = eh_frame_sections.begin(); | |
1908 | p != eh_frame_sections.end(); | |
1909 | ++p) | |
1910 | { | |
1911 | unsigned int i = *p; | |
1912 | const unsigned char* pshdr; | |
1913 | pshdr = section_headers_data + i * This::shdr_size; | |
1914 | typename This::Shdr shdr(pshdr); | |
1915 | ||
1916 | this->layout_eh_frame_section(layout, | |
1917 | symbols_data, | |
1918 | symbols_size, | |
1919 | symbol_names_data, | |
1920 | symbol_names_size, | |
1921 | i, | |
1922 | shdr, | |
1923 | reloc_shndx[i], | |
1924 | reloc_type[i]); | |
1925 | } | |
1926 | ||
6a74a719 | 1927 | // When doing a relocatable link handle the reloc sections at the |
2e702c99 RM |
1928 | // end. Garbage collection and Identical Code Folding is not |
1929 | // turned on for relocatable code. | |
2ea97941 | 1930 | if (emit_relocs) |
6a74a719 | 1931 | this->size_relocatable_relocs(); |
ef15dade | 1932 | |
16164a6b | 1933 | gold_assert(!is_two_pass || reloc_sections.empty()); |
ef15dade | 1934 | |
6a74a719 ILT |
1935 | for (std::vector<unsigned int>::const_iterator p = reloc_sections.begin(); |
1936 | p != reloc_sections.end(); | |
1937 | ++p) | |
1938 | { | |
1939 | unsigned int i = *p; | |
1940 | const unsigned char* pshdr; | |
6d03d481 | 1941 | pshdr = section_headers_data + i * This::shdr_size; |
6a74a719 ILT |
1942 | typename This::Shdr shdr(pshdr); |
1943 | ||
d491d34e | 1944 | unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info()); |
2ea97941 | 1945 | if (data_shndx >= shnum) |
6a74a719 ILT |
1946 | { |
1947 | // We already warned about this above. | |
1948 | continue; | |
1949 | } | |
1950 | ||
ef9beddf | 1951 | Output_section* data_section = out_sections[data_shndx]; |
f3a2388f | 1952 | if (data_section == reinterpret_cast<Output_section*>(2)) |
2e702c99 | 1953 | { |
c924eb67 CC |
1954 | if (is_pass_two) |
1955 | continue; | |
2e702c99 RM |
1956 | // The layout for the data section was deferred, so we need |
1957 | // to defer the relocation section, too. | |
f3a2388f | 1958 | const char* name = pnames + shdr.get_sh_name(); |
2e702c99 | 1959 | this->deferred_layout_relocs_.push_back( |
bce5a025 CC |
1960 | Deferred_layout(i, name, shdr.get_sh_type(), pshdr, 0, |
1961 | elfcpp::SHT_NULL)); | |
f3a2388f | 1962 | out_sections[i] = reinterpret_cast<Output_section*>(2); |
2e702c99 RM |
1963 | out_section_offsets[i] = invalid_address; |
1964 | continue; | |
1965 | } | |
6a74a719 ILT |
1966 | if (data_section == NULL) |
1967 | { | |
ef9beddf | 1968 | out_sections[i] = NULL; |
2e702c99 | 1969 | out_section_offsets[i] = invalid_address; |
6a74a719 ILT |
1970 | continue; |
1971 | } | |
1972 | ||
1973 | Relocatable_relocs* rr = new Relocatable_relocs(); | |
1974 | this->set_relocatable_relocs(i, rr); | |
1975 | ||
2ea97941 ILT |
1976 | Output_section* os = layout->layout_reloc(this, i, shdr, data_section, |
1977 | rr); | |
ef9beddf | 1978 | out_sections[i] = os; |
eff45813 | 1979 | out_section_offsets[i] = invalid_address; |
6a74a719 ILT |
1980 | } |
1981 | ||
c1027032 CC |
1982 | // When building a .gdb_index section, scan the .debug_info and |
1983 | // .debug_types sections. | |
16164a6b | 1984 | gold_assert(!is_pass_one |
c1027032 CC |
1985 | || (debug_info_sections.empty() && debug_types_sections.empty())); |
1986 | for (std::vector<unsigned int>::const_iterator p | |
1987 | = debug_info_sections.begin(); | |
1988 | p != debug_info_sections.end(); | |
1989 | ++p) | |
1990 | { | |
1991 | unsigned int i = *p; | |
1992 | layout->add_to_gdb_index(false, this, symbols_data, symbols_size, | |
1993 | i, reloc_shndx[i], reloc_type[i]); | |
1994 | } | |
1995 | for (std::vector<unsigned int>::const_iterator p | |
1996 | = debug_types_sections.begin(); | |
1997 | p != debug_types_sections.end(); | |
1998 | ++p) | |
1999 | { | |
2000 | unsigned int i = *p; | |
2001 | layout->add_to_gdb_index(true, this, symbols_data, symbols_size, | |
2002 | i, reloc_shndx[i], reloc_type[i]); | |
2003 | } | |
2004 | ||
16164a6b | 2005 | if (is_pass_two) |
6d03d481 ST |
2006 | { |
2007 | delete[] gc_sd->section_headers_data; | |
2008 | delete[] gc_sd->section_names_data; | |
2009 | delete[] gc_sd->symbols_data; | |
2010 | delete[] gc_sd->symbol_names_data; | |
ef15dade | 2011 | this->set_symbols_data(NULL); |
6d03d481 ST |
2012 | } |
2013 | else | |
2014 | { | |
2015 | delete sd->section_headers; | |
2016 | sd->section_headers = NULL; | |
2017 | delete sd->section_names; | |
2018 | sd->section_names = NULL; | |
2019 | } | |
12e14209 ILT |
2020 | } |
2021 | ||
5995b570 CC |
2022 | // Layout sections whose layout was deferred while waiting for |
2023 | // input files from a plugin. | |
2024 | ||
2025 | template<int size, bool big_endian> | |
2026 | void | |
6fa2a40b | 2027 | Sized_relobj_file<size, big_endian>::do_layout_deferred_sections(Layout* layout) |
5995b570 CC |
2028 | { |
2029 | typename std::vector<Deferred_layout>::iterator deferred; | |
2030 | ||
2031 | for (deferred = this->deferred_layout_.begin(); | |
2032 | deferred != this->deferred_layout_.end(); | |
2033 | ++deferred) | |
2034 | { | |
2035 | typename This::Shdr shdr(deferred->shdr_data_); | |
5e0f337e | 2036 | |
54a3d865 ILT |
2037 | if (!parameters->options().relocatable() |
2038 | && deferred->name_ == ".eh_frame" | |
2039 | && this->check_eh_frame_flags(&shdr)) | |
14788a3f | 2040 | { |
54a3d865 ILT |
2041 | // Checking is_section_included is not reliable for |
2042 | // .eh_frame sections, because they do not have an output | |
2043 | // section. This is not a problem normally because we call | |
2044 | // layout_eh_frame_section unconditionally, but when | |
2045 | // deferring sections that is not true. We don't want to | |
2046 | // keep all .eh_frame sections because that will cause us to | |
2047 | // keep all sections that they refer to, which is the wrong | |
2048 | // way around. Instead, the eh_frame code will discard | |
2049 | // .eh_frame sections that refer to discarded sections. | |
2050 | ||
14788a3f ILT |
2051 | // Reading the symbols again here may be slow. |
2052 | Read_symbols_data sd; | |
f35c4853 | 2053 | this->base_read_symbols(&sd); |
14788a3f ILT |
2054 | this->layout_eh_frame_section(layout, |
2055 | sd.symbols->data(), | |
2056 | sd.symbols_size, | |
2057 | sd.symbol_names->data(), | |
2058 | sd.symbol_names_size, | |
2059 | deferred->shndx_, | |
2060 | shdr, | |
2061 | deferred->reloc_shndx_, | |
2062 | deferred->reloc_type_); | |
54a3d865 | 2063 | continue; |
14788a3f | 2064 | } |
54a3d865 ILT |
2065 | |
2066 | // If the section is not included, it is because the garbage collector | |
2067 | // decided it is not needed. Avoid reverting that decision. | |
2068 | if (!this->is_section_included(deferred->shndx_)) | |
2069 | continue; | |
2070 | ||
2071 | this->layout_section(layout, deferred->shndx_, deferred->name_.c_str(), | |
bce5a025 | 2072 | shdr, shdr.get_sh_type(), deferred->reloc_shndx_, |
54a3d865 | 2073 | deferred->reloc_type_); |
5995b570 CC |
2074 | } |
2075 | ||
2076 | this->deferred_layout_.clear(); | |
f3a2388f CC |
2077 | |
2078 | // Now handle the deferred relocation sections. | |
2079 | ||
2080 | Output_sections& out_sections(this->output_sections()); | |
6fa2a40b | 2081 | std::vector<Address>& out_section_offsets(this->section_offsets()); |
f3a2388f CC |
2082 | |
2083 | for (deferred = this->deferred_layout_relocs_.begin(); | |
2084 | deferred != this->deferred_layout_relocs_.end(); | |
2085 | ++deferred) | |
2086 | { | |
2087 | unsigned int shndx = deferred->shndx_; | |
2088 | typename This::Shdr shdr(deferred->shdr_data_); | |
2089 | unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info()); | |
2090 | ||
2091 | Output_section* data_section = out_sections[data_shndx]; | |
2092 | if (data_section == NULL) | |
2093 | { | |
2094 | out_sections[shndx] = NULL; | |
2e702c99 | 2095 | out_section_offsets[shndx] = invalid_address; |
f3a2388f CC |
2096 | continue; |
2097 | } | |
2098 | ||
2099 | Relocatable_relocs* rr = new Relocatable_relocs(); | |
2100 | this->set_relocatable_relocs(shndx, rr); | |
2101 | ||
2102 | Output_section* os = layout->layout_reloc(this, shndx, shdr, | |
2103 | data_section, rr); | |
2104 | out_sections[shndx] = os; | |
2105 | out_section_offsets[shndx] = invalid_address; | |
2106 | } | |
5995b570 CC |
2107 | } |
2108 | ||
12e14209 ILT |
2109 | // Add the symbols to the symbol table. |
2110 | ||
2111 | template<int size, bool big_endian> | |
2112 | void | |
6fa2a40b CC |
2113 | Sized_relobj_file<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
2114 | Read_symbols_data* sd, | |
cc5277b1 | 2115 | Layout* layout) |
12e14209 ILT |
2116 | { |
2117 | if (sd->symbols == NULL) | |
2118 | { | |
a3ad94ed | 2119 | gold_assert(sd->symbol_names == NULL); |
12e14209 ILT |
2120 | return; |
2121 | } | |
a2fb1b05 | 2122 | |
2ea97941 | 2123 | const int sym_size = This::sym_size; |
730cdc88 | 2124 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) |
2ea97941 ILT |
2125 | / sym_size); |
2126 | if (symcount * sym_size != sd->symbols_size - sd->external_symbols_offset) | |
12e14209 | 2127 | { |
75f2446e ILT |
2128 | this->error(_("size of symbols is not multiple of symbol size")); |
2129 | return; | |
a2fb1b05 | 2130 | } |
12e14209 | 2131 | |
730cdc88 | 2132 | this->symbols_.resize(symcount); |
12e14209 | 2133 | |
b4c555cf ML |
2134 | if (!parameters->options().relocatable() |
2135 | && layout->is_lto_slim_object ()) | |
cc5277b1 ML |
2136 | gold_info(_("%s: plugin needed to handle lto object"), |
2137 | this->name().c_str()); | |
2138 | ||
12e14209 ILT |
2139 | const char* sym_names = |
2140 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
730cdc88 ILT |
2141 | symtab->add_from_relobj(this, |
2142 | sd->symbols->data() + sd->external_symbols_offset, | |
7fcd3aa9 | 2143 | symcount, this->local_symbol_count_, |
d491d34e | 2144 | sym_names, sd->symbol_names_size, |
92de84a6 ILT |
2145 | &this->symbols_, |
2146 | &this->defined_count_); | |
12e14209 ILT |
2147 | |
2148 | delete sd->symbols; | |
2149 | sd->symbols = NULL; | |
2150 | delete sd->symbol_names; | |
2151 | sd->symbol_names = NULL; | |
bae7f79e ILT |
2152 | } |
2153 | ||
b0193076 RÁE |
2154 | // Find out if this object, that is a member of a lib group, should be included |
2155 | // in the link. We check every symbol defined by this object. If the symbol | |
2156 | // table has a strong undefined reference to that symbol, we have to include | |
2157 | // the object. | |
2158 | ||
2159 | template<int size, bool big_endian> | |
2160 | Archive::Should_include | |
6fa2a40b CC |
2161 | Sized_relobj_file<size, big_endian>::do_should_include_member( |
2162 | Symbol_table* symtab, | |
2163 | Layout* layout, | |
2164 | Read_symbols_data* sd, | |
2165 | std::string* why) | |
b0193076 RÁE |
2166 | { |
2167 | char* tmpbuf = NULL; | |
2168 | size_t tmpbuflen = 0; | |
2169 | const char* sym_names = | |
2170 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
2171 | const unsigned char* syms = | |
2172 | sd->symbols->data() + sd->external_symbols_offset; | |
2173 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
2174 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) | |
2e702c99 | 2175 | / sym_size); |
b0193076 RÁE |
2176 | |
2177 | const unsigned char* p = syms; | |
2178 | ||
2179 | for (size_t i = 0; i < symcount; ++i, p += sym_size) | |
2180 | { | |
2181 | elfcpp::Sym<size, big_endian> sym(p); | |
2182 | unsigned int st_shndx = sym.get_st_shndx(); | |
2183 | if (st_shndx == elfcpp::SHN_UNDEF) | |
2184 | continue; | |
2185 | ||
2186 | unsigned int st_name = sym.get_st_name(); | |
2187 | const char* name = sym_names + st_name; | |
2188 | Symbol* symbol; | |
88a4108b ILT |
2189 | Archive::Should_include t = Archive::should_include_member(symtab, |
2190 | layout, | |
2191 | name, | |
b0193076 RÁE |
2192 | &symbol, why, |
2193 | &tmpbuf, | |
2194 | &tmpbuflen); | |
2195 | if (t == Archive::SHOULD_INCLUDE_YES) | |
2196 | { | |
2197 | if (tmpbuf != NULL) | |
2198 | free(tmpbuf); | |
2199 | return t; | |
2200 | } | |
2201 | } | |
2202 | if (tmpbuf != NULL) | |
2203 | free(tmpbuf); | |
2204 | return Archive::SHOULD_INCLUDE_UNKNOWN; | |
2205 | } | |
2206 | ||
e0c52780 CC |
2207 | // Iterate over global defined symbols, calling a visitor class V for each. |
2208 | ||
2209 | template<int size, bool big_endian> | |
2210 | void | |
6fa2a40b | 2211 | Sized_relobj_file<size, big_endian>::do_for_all_global_symbols( |
e0c52780 CC |
2212 | Read_symbols_data* sd, |
2213 | Library_base::Symbol_visitor_base* v) | |
2214 | { | |
2215 | const char* sym_names = | |
2216 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
2217 | const unsigned char* syms = | |
2218 | sd->symbols->data() + sd->external_symbols_offset; | |
2219 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
2220 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) | |
2e702c99 | 2221 | / sym_size); |
e0c52780 CC |
2222 | const unsigned char* p = syms; |
2223 | ||
2224 | for (size_t i = 0; i < symcount; ++i, p += sym_size) | |
2225 | { | |
2226 | elfcpp::Sym<size, big_endian> sym(p); | |
2227 | if (sym.get_st_shndx() != elfcpp::SHN_UNDEF) | |
2228 | v->visit(sym_names + sym.get_st_name()); | |
2229 | } | |
2230 | } | |
2231 | ||
7223e9ca ILT |
2232 | // Return whether the local symbol SYMNDX has a PLT offset. |
2233 | ||
2234 | template<int size, bool big_endian> | |
2235 | bool | |
6fa2a40b CC |
2236 | Sized_relobj_file<size, big_endian>::local_has_plt_offset( |
2237 | unsigned int symndx) const | |
7223e9ca ILT |
2238 | { |
2239 | typename Local_plt_offsets::const_iterator p = | |
2240 | this->local_plt_offsets_.find(symndx); | |
2241 | return p != this->local_plt_offsets_.end(); | |
2242 | } | |
2243 | ||
2244 | // Get the PLT offset of a local symbol. | |
2245 | ||
2246 | template<int size, bool big_endian> | |
2247 | unsigned int | |
83896202 ILT |
2248 | Sized_relobj_file<size, big_endian>::do_local_plt_offset( |
2249 | unsigned int symndx) const | |
7223e9ca ILT |
2250 | { |
2251 | typename Local_plt_offsets::const_iterator p = | |
2252 | this->local_plt_offsets_.find(symndx); | |
2253 | gold_assert(p != this->local_plt_offsets_.end()); | |
2254 | return p->second; | |
2255 | } | |
2256 | ||
2257 | // Set the PLT offset of a local symbol. | |
2258 | ||
2259 | template<int size, bool big_endian> | |
2260 | void | |
6fa2a40b CC |
2261 | Sized_relobj_file<size, big_endian>::set_local_plt_offset( |
2262 | unsigned int symndx, unsigned int plt_offset) | |
7223e9ca ILT |
2263 | { |
2264 | std::pair<typename Local_plt_offsets::iterator, bool> ins = | |
2265 | this->local_plt_offsets_.insert(std::make_pair(symndx, plt_offset)); | |
2266 | gold_assert(ins.second); | |
2267 | } | |
2268 | ||
cb295612 ILT |
2269 | // First pass over the local symbols. Here we add their names to |
2270 | // *POOL and *DYNPOOL, and we store the symbol value in | |
2271 | // THIS->LOCAL_VALUES_. This function is always called from a | |
2272 | // singleton thread. This is followed by a call to | |
2273 | // finalize_local_symbols. | |
75f65a3e ILT |
2274 | |
2275 | template<int size, bool big_endian> | |
7bf1f802 | 2276 | void |
6fa2a40b CC |
2277 | Sized_relobj_file<size, big_endian>::do_count_local_symbols(Stringpool* pool, |
2278 | Stringpool* dynpool) | |
75f65a3e | 2279 | { |
a3ad94ed | 2280 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 2281 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
2282 | { |
2283 | // This object has no symbols. Weird but legal. | |
7bf1f802 | 2284 | return; |
61ba1cf9 ILT |
2285 | } |
2286 | ||
75f65a3e | 2287 | // Read the symbol table section header. |
2ea97941 | 2288 | const unsigned int symtab_shndx = this->symtab_shndx_; |
645f8123 | 2289 | typename This::Shdr symtabshdr(this, |
2ea97941 | 2290 | this->elf_file_.section_header(symtab_shndx)); |
a3ad94ed | 2291 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
75f65a3e ILT |
2292 | |
2293 | // Read the local symbols. | |
2ea97941 | 2294 | const int sym_size = This::sym_size; |
92e059d8 | 2295 | const unsigned int loccount = this->local_symbol_count_; |
a3ad94ed | 2296 | gold_assert(loccount == symtabshdr.get_sh_info()); |
2ea97941 | 2297 | off_t locsize = loccount * sym_size; |
75f65a3e | 2298 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
39d0cb0e | 2299 | locsize, true, true); |
75f65a3e | 2300 | |
75f65a3e | 2301 | // Read the symbol names. |
d491d34e ILT |
2302 | const unsigned int strtab_shndx = |
2303 | this->adjust_shndx(symtabshdr.get_sh_link()); | |
8383303e | 2304 | section_size_type strtab_size; |
645f8123 | 2305 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
9eb9fa57 ILT |
2306 | &strtab_size, |
2307 | true); | |
75f65a3e ILT |
2308 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
2309 | ||
2310 | // Loop over the local symbols. | |
2311 | ||
ef9beddf | 2312 | const Output_sections& out_sections(this->output_sections()); |
cd3c333f | 2313 | std::vector<Address>& out_section_offsets(this->section_offsets()); |
2ea97941 | 2314 | unsigned int shnum = this->shnum(); |
61ba1cf9 | 2315 | unsigned int count = 0; |
7bf1f802 | 2316 | unsigned int dyncount = 0; |
75f65a3e | 2317 | // Skip the first, dummy, symbol. |
2ea97941 | 2318 | psyms += sym_size; |
403676b5 | 2319 | bool strip_all = parameters->options().strip_all(); |
ebcc8304 | 2320 | bool discard_all = parameters->options().discard_all(); |
bb04269c | 2321 | bool discard_locals = parameters->options().discard_locals(); |
cd3c333f | 2322 | bool discard_sec_merge = parameters->options().discard_sec_merge(); |
2ea97941 | 2323 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
75f65a3e ILT |
2324 | { |
2325 | elfcpp::Sym<size, big_endian> sym(psyms); | |
2326 | ||
b8e6aad9 ILT |
2327 | Symbol_value<size>& lv(this->local_values_[i]); |
2328 | ||
d491d34e ILT |
2329 | bool is_ordinary; |
2330 | unsigned int shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(), | |
2331 | &is_ordinary); | |
2332 | lv.set_input_shndx(shndx, is_ordinary); | |
75f65a3e | 2333 | |
063f12a8 ILT |
2334 | if (sym.get_st_type() == elfcpp::STT_SECTION) |
2335 | lv.set_is_section_symbol(); | |
7bf1f802 ILT |
2336 | else if (sym.get_st_type() == elfcpp::STT_TLS) |
2337 | lv.set_is_tls_symbol(); | |
7223e9ca ILT |
2338 | else if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC) |
2339 | lv.set_is_ifunc_symbol(); | |
7bf1f802 ILT |
2340 | |
2341 | // Save the input symbol value for use in do_finalize_local_symbols(). | |
2342 | lv.set_input_value(sym.get_st_value()); | |
2343 | ||
2344 | // Decide whether this symbol should go into the output file. | |
063f12a8 | 2345 | |
82d93790 | 2346 | if (is_ordinary |
8de0e07b CC |
2347 | && shndx < shnum |
2348 | && (out_sections[shndx] == NULL | |
2349 | || (out_sections[shndx]->order() == ORDER_EHFRAME | |
2350 | && out_section_offsets[shndx] == invalid_address))) | |
2e702c99 | 2351 | { |
8de0e07b CC |
2352 | // This is either a discarded section or an optimized .eh_frame |
2353 | // section. | |
7bf1f802 | 2354 | lv.set_no_output_symtab_entry(); |
2e702c99 RM |
2355 | gold_assert(!lv.needs_output_dynsym_entry()); |
2356 | continue; | |
2357 | } | |
7bf1f802 | 2358 | |
ec4dbad3 AM |
2359 | if (sym.get_st_type() == elfcpp::STT_SECTION |
2360 | || !this->adjust_local_symbol(&lv)) | |
7bf1f802 ILT |
2361 | { |
2362 | lv.set_no_output_symtab_entry(); | |
2e702c99 | 2363 | gold_assert(!lv.needs_output_dynsym_entry()); |
7bf1f802 ILT |
2364 | continue; |
2365 | } | |
2366 | ||
2367 | if (sym.get_st_name() >= strtab_size) | |
2368 | { | |
2369 | this->error(_("local symbol %u section name out of range: %u >= %u"), | |
2370 | i, sym.get_st_name(), | |
2371 | static_cast<unsigned int>(strtab_size)); | |
2372 | lv.set_no_output_symtab_entry(); | |
2373 | continue; | |
2374 | } | |
2375 | ||
ebcc8304 ILT |
2376 | const char* name = pnames + sym.get_st_name(); |
2377 | ||
2378 | // If needed, add the symbol to the dynamic symbol table string pool. | |
2379 | if (lv.needs_output_dynsym_entry()) | |
2e702c99 RM |
2380 | { |
2381 | dynpool->add(name, true, NULL); | |
2382 | ++dyncount; | |
2383 | } | |
ebcc8304 | 2384 | |
403676b5 CC |
2385 | if (strip_all |
2386 | || (discard_all && lv.may_be_discarded_from_output_symtab())) | |
ebcc8304 ILT |
2387 | { |
2388 | lv.set_no_output_symtab_entry(); | |
2389 | continue; | |
2390 | } | |
2391 | ||
cd3c333f | 2392 | // By default, discard temporary local symbols in merge sections. |
bb04269c DK |
2393 | // If --discard-locals option is used, discard all temporary local |
2394 | // symbols. These symbols start with system-specific local label | |
2395 | // prefixes, typically .L for ELF system. We want to be compatible | |
2396 | // with GNU ld so here we essentially use the same check in | |
2397 | // bfd_is_local_label(). The code is different because we already | |
2398 | // know that: | |
2399 | // | |
2400 | // - the symbol is local and thus cannot have global or weak binding. | |
2401 | // - the symbol is not a section symbol. | |
2402 | // - the symbol has a name. | |
2403 | // | |
2404 | // We do not discard a symbol if it needs a dynamic symbol entry. | |
cd3c333f CC |
2405 | if ((discard_locals |
2406 | || (discard_sec_merge | |
2407 | && is_ordinary | |
2408 | && out_section_offsets[shndx] == invalid_address)) | |
bb04269c DK |
2409 | && sym.get_st_type() != elfcpp::STT_FILE |
2410 | && !lv.needs_output_dynsym_entry() | |
d3bbad62 | 2411 | && lv.may_be_discarded_from_output_symtab() |
2ea97941 | 2412 | && parameters->target().is_local_label_name(name)) |
bb04269c DK |
2413 | { |
2414 | lv.set_no_output_symtab_entry(); | |
2415 | continue; | |
2416 | } | |
2417 | ||
8c604651 CS |
2418 | // Discard the local symbol if -retain_symbols_file is specified |
2419 | // and the local symbol is not in that file. | |
2ea97941 | 2420 | if (!parameters->options().should_retain_symbol(name)) |
2e702c99 RM |
2421 | { |
2422 | lv.set_no_output_symtab_entry(); | |
2423 | continue; | |
2424 | } | |
8c604651 | 2425 | |
bb04269c | 2426 | // Add the symbol to the symbol table string pool. |
2ea97941 | 2427 | pool->add(name, true, NULL); |
7bf1f802 | 2428 | ++count; |
7bf1f802 ILT |
2429 | } |
2430 | ||
2431 | this->output_local_symbol_count_ = count; | |
2432 | this->output_local_dynsym_count_ = dyncount; | |
2433 | } | |
2434 | ||
aa98ff75 DK |
2435 | // Compute the final value of a local symbol. |
2436 | ||
2437 | template<int size, bool big_endian> | |
6fa2a40b CC |
2438 | typename Sized_relobj_file<size, big_endian>::Compute_final_local_value_status |
2439 | Sized_relobj_file<size, big_endian>::compute_final_local_value_internal( | |
aa98ff75 DK |
2440 | unsigned int r_sym, |
2441 | const Symbol_value<size>* lv_in, | |
2442 | Symbol_value<size>* lv_out, | |
033bfb73 | 2443 | bool relocatable, |
aa98ff75 DK |
2444 | const Output_sections& out_sections, |
2445 | const std::vector<Address>& out_offsets, | |
2446 | const Symbol_table* symtab) | |
2447 | { | |
2448 | // We are going to overwrite *LV_OUT, if it has a merged symbol value, | |
2449 | // we may have a memory leak. | |
2450 | gold_assert(lv_out->has_output_value()); | |
2451 | ||
2452 | bool is_ordinary; | |
2453 | unsigned int shndx = lv_in->input_shndx(&is_ordinary); | |
2e702c99 | 2454 | |
aa98ff75 | 2455 | // Set the output symbol value. |
2e702c99 | 2456 | |
aa98ff75 DK |
2457 | if (!is_ordinary) |
2458 | { | |
2459 | if (shndx == elfcpp::SHN_ABS || Symbol::is_common_shndx(shndx)) | |
2460 | lv_out->set_output_value(lv_in->input_value()); | |
2461 | else | |
2462 | { | |
2463 | this->error(_("unknown section index %u for local symbol %u"), | |
2464 | shndx, r_sym); | |
2465 | lv_out->set_output_value(0); | |
2466 | return This::CFLV_ERROR; | |
2467 | } | |
2468 | } | |
2469 | else | |
2470 | { | |
2471 | if (shndx >= this->shnum()) | |
2472 | { | |
2473 | this->error(_("local symbol %u section index %u out of range"), | |
2474 | r_sym, shndx); | |
2475 | lv_out->set_output_value(0); | |
2476 | return This::CFLV_ERROR; | |
2477 | } | |
2e702c99 | 2478 | |
aa98ff75 DK |
2479 | Output_section* os = out_sections[shndx]; |
2480 | Address secoffset = out_offsets[shndx]; | |
2481 | if (symtab->is_section_folded(this, shndx)) | |
2482 | { | |
2483 | gold_assert(os == NULL && secoffset == invalid_address); | |
2484 | // Get the os of the section it is folded onto. | |
2485 | Section_id folded = symtab->icf()->get_folded_section(this, | |
2486 | shndx); | |
2487 | gold_assert(folded.first != NULL); | |
6fa2a40b CC |
2488 | Sized_relobj_file<size, big_endian>* folded_obj = reinterpret_cast |
2489 | <Sized_relobj_file<size, big_endian>*>(folded.first); | |
aa98ff75 DK |
2490 | os = folded_obj->output_section(folded.second); |
2491 | gold_assert(os != NULL); | |
2492 | secoffset = folded_obj->get_output_section_offset(folded.second); | |
2e702c99 | 2493 | |
aa98ff75 DK |
2494 | // This could be a relaxed input section. |
2495 | if (secoffset == invalid_address) | |
2496 | { | |
2497 | const Output_relaxed_input_section* relaxed_section = | |
2498 | os->find_relaxed_input_section(folded_obj, folded.second); | |
2499 | gold_assert(relaxed_section != NULL); | |
2500 | secoffset = relaxed_section->address() - os->address(); | |
2501 | } | |
2502 | } | |
2e702c99 | 2503 | |
aa98ff75 DK |
2504 | if (os == NULL) |
2505 | { | |
2506 | // This local symbol belongs to a section we are discarding. | |
2507 | // In some cases when applying relocations later, we will | |
2508 | // attempt to match it to the corresponding kept section, | |
2509 | // so we leave the input value unchanged here. | |
2510 | return This::CFLV_DISCARDED; | |
2511 | } | |
2512 | else if (secoffset == invalid_address) | |
2513 | { | |
2514 | uint64_t start; | |
2e702c99 | 2515 | |
aa98ff75 DK |
2516 | // This is a SHF_MERGE section or one which otherwise |
2517 | // requires special handling. | |
8de0e07b | 2518 | if (os->order() == ORDER_EHFRAME) |
aa98ff75 | 2519 | { |
8de0e07b CC |
2520 | // This local symbol belongs to a discarded or optimized |
2521 | // .eh_frame section. Just treat it like the case in which | |
aa98ff75 DK |
2522 | // os == NULL above. |
2523 | gold_assert(this->has_eh_frame_); | |
2524 | return This::CFLV_DISCARDED; | |
2525 | } | |
2526 | else if (!lv_in->is_section_symbol()) | |
2527 | { | |
2528 | // This is not a section symbol. We can determine | |
2529 | // the final value now. | |
033bfb73 CC |
2530 | uint64_t value = |
2531 | os->output_address(this, shndx, lv_in->input_value()); | |
2532 | if (relocatable) | |
2533 | value -= os->address(); | |
2534 | lv_out->set_output_value(value); | |
aa98ff75 DK |
2535 | } |
2536 | else if (!os->find_starting_output_address(this, shndx, &start)) | |
2537 | { | |
2538 | // This is a section symbol, but apparently not one in a | |
2539 | // merged section. First check to see if this is a relaxed | |
2540 | // input section. If so, use its address. Otherwise just | |
2541 | // use the start of the output section. This happens with | |
2542 | // relocatable links when the input object has section | |
2543 | // symbols for arbitrary non-merge sections. | |
2544 | const Output_section_data* posd = | |
2545 | os->find_relaxed_input_section(this, shndx); | |
2546 | if (posd != NULL) | |
2547 | { | |
033bfb73 CC |
2548 | uint64_t value = posd->address(); |
2549 | if (relocatable) | |
2550 | value -= os->address(); | |
2551 | lv_out->set_output_value(value); | |
aa98ff75 DK |
2552 | } |
2553 | else | |
2554 | lv_out->set_output_value(os->address()); | |
2555 | } | |
2556 | else | |
2557 | { | |
2558 | // We have to consider the addend to determine the | |
2559 | // value to use in a relocation. START is the start | |
033bfb73 CC |
2560 | // of this input section. If we are doing a relocatable |
2561 | // link, use offset from start output section instead of | |
2562 | // address. | |
2563 | Address adjusted_start = | |
2564 | relocatable ? start - os->address() : start; | |
aa98ff75 DK |
2565 | Merged_symbol_value<size>* msv = |
2566 | new Merged_symbol_value<size>(lv_in->input_value(), | |
033bfb73 | 2567 | adjusted_start); |
aa98ff75 DK |
2568 | lv_out->set_merged_symbol_value(msv); |
2569 | } | |
2570 | } | |
5efeedf6 CC |
2571 | else if (lv_in->is_tls_symbol() |
2572 | || (lv_in->is_section_symbol() | |
2573 | && (os->flags() & elfcpp::SHF_TLS))) | |
aa98ff75 DK |
2574 | lv_out->set_output_value(os->tls_offset() |
2575 | + secoffset | |
2576 | + lv_in->input_value()); | |
2577 | else | |
033bfb73 | 2578 | lv_out->set_output_value((relocatable ? 0 : os->address()) |
aa98ff75 DK |
2579 | + secoffset |
2580 | + lv_in->input_value()); | |
2581 | } | |
2582 | return This::CFLV_OK; | |
2583 | } | |
2584 | ||
2585 | // Compute final local symbol value. R_SYM is the index of a local | |
2586 | // symbol in symbol table. LV points to a symbol value, which is | |
2587 | // expected to hold the input value and to be over-written by the | |
2588 | // final value. SYMTAB points to a symbol table. Some targets may want | |
2589 | // to know would-be-finalized local symbol values in relaxation. | |
2590 | // Hence we provide this method. Since this method updates *LV, a | |
2591 | // callee should make a copy of the original local symbol value and | |
2592 | // use the copy instead of modifying an object's local symbols before | |
2593 | // everything is finalized. The caller should also free up any allocated | |
2594 | // memory in the return value in *LV. | |
2595 | template<int size, bool big_endian> | |
6fa2a40b CC |
2596 | typename Sized_relobj_file<size, big_endian>::Compute_final_local_value_status |
2597 | Sized_relobj_file<size, big_endian>::compute_final_local_value( | |
aa98ff75 DK |
2598 | unsigned int r_sym, |
2599 | const Symbol_value<size>* lv_in, | |
2600 | Symbol_value<size>* lv_out, | |
2601 | const Symbol_table* symtab) | |
2602 | { | |
2603 | // This is just a wrapper of compute_final_local_value_internal. | |
033bfb73 | 2604 | const bool relocatable = parameters->options().relocatable(); |
aa98ff75 | 2605 | const Output_sections& out_sections(this->output_sections()); |
6fa2a40b | 2606 | const std::vector<Address>& out_offsets(this->section_offsets()); |
aa98ff75 | 2607 | return this->compute_final_local_value_internal(r_sym, lv_in, lv_out, |
033bfb73 CC |
2608 | relocatable, out_sections, |
2609 | out_offsets, symtab); | |
aa98ff75 DK |
2610 | } |
2611 | ||
cb295612 | 2612 | // Finalize the local symbols. Here we set the final value in |
7bf1f802 | 2613 | // THIS->LOCAL_VALUES_ and set their output symbol table indexes. |
17a1d0a9 | 2614 | // This function is always called from a singleton thread. The actual |
7bf1f802 ILT |
2615 | // output of the local symbols will occur in a separate task. |
2616 | ||
2617 | template<int size, bool big_endian> | |
2618 | unsigned int | |
6fa2a40b CC |
2619 | Sized_relobj_file<size, big_endian>::do_finalize_local_symbols( |
2620 | unsigned int index, | |
2621 | off_t off, | |
2622 | Symbol_table* symtab) | |
7bf1f802 ILT |
2623 | { |
2624 | gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); | |
2625 | ||
2626 | const unsigned int loccount = this->local_symbol_count_; | |
2627 | this->local_symbol_offset_ = off; | |
2628 | ||
033bfb73 | 2629 | const bool relocatable = parameters->options().relocatable(); |
ef9beddf | 2630 | const Output_sections& out_sections(this->output_sections()); |
6fa2a40b | 2631 | const std::vector<Address>& out_offsets(this->section_offsets()); |
7bf1f802 ILT |
2632 | |
2633 | for (unsigned int i = 1; i < loccount; ++i) | |
2634 | { | |
aa98ff75 | 2635 | Symbol_value<size>* lv = &this->local_values_[i]; |
7bf1f802 | 2636 | |
6695e4b3 | 2637 | Compute_final_local_value_status cflv_status = |
033bfb73 CC |
2638 | this->compute_final_local_value_internal(i, lv, lv, relocatable, |
2639 | out_sections, out_offsets, | |
2640 | symtab); | |
aa98ff75 | 2641 | switch (cflv_status) |
75f65a3e | 2642 | { |
aa98ff75 DK |
2643 | case CFLV_OK: |
2644 | if (!lv->is_output_symtab_index_set()) | |
75f65a3e | 2645 | { |
aa98ff75 DK |
2646 | lv->set_output_symtab_index(index); |
2647 | ++index; | |
75f65a3e | 2648 | } |
aa465b19 AM |
2649 | if (lv->is_ifunc_symbol() |
2650 | && (lv->has_output_symtab_entry() | |
2651 | || lv->needs_output_dynsym_entry())) | |
2652 | symtab->set_has_gnu_output(); | |
aa98ff75 DK |
2653 | break; |
2654 | case CFLV_DISCARDED: | |
2655 | case CFLV_ERROR: | |
2656 | // Do nothing. | |
2657 | break; | |
2658 | default: | |
2659 | gold_unreachable(); | |
75f65a3e | 2660 | } |
7bf1f802 ILT |
2661 | } |
2662 | return index; | |
2663 | } | |
645f8123 | 2664 | |
7bf1f802 | 2665 | // Set the output dynamic symbol table indexes for the local variables. |
c06b7b0b | 2666 | |
7bf1f802 ILT |
2667 | template<int size, bool big_endian> |
2668 | unsigned int | |
6fa2a40b CC |
2669 | Sized_relobj_file<size, big_endian>::do_set_local_dynsym_indexes( |
2670 | unsigned int index) | |
7bf1f802 ILT |
2671 | { |
2672 | const unsigned int loccount = this->local_symbol_count_; | |
2673 | for (unsigned int i = 1; i < loccount; ++i) | |
2674 | { | |
2675 | Symbol_value<size>& lv(this->local_values_[i]); | |
2676 | if (lv.needs_output_dynsym_entry()) | |
2e702c99 RM |
2677 | { |
2678 | lv.set_output_dynsym_index(index); | |
2679 | ++index; | |
2680 | } | |
75f65a3e | 2681 | } |
7bf1f802 ILT |
2682 | return index; |
2683 | } | |
75f65a3e | 2684 | |
7bf1f802 ILT |
2685 | // Set the offset where local dynamic symbol information will be stored. |
2686 | // Returns the count of local symbols contributed to the symbol table by | |
2687 | // this object. | |
61ba1cf9 | 2688 | |
7bf1f802 ILT |
2689 | template<int size, bool big_endian> |
2690 | unsigned int | |
6fa2a40b | 2691 | Sized_relobj_file<size, big_endian>::do_set_local_dynsym_offset(off_t off) |
7bf1f802 ILT |
2692 | { |
2693 | gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); | |
2694 | this->local_dynsym_offset_ = off; | |
2695 | return this->output_local_dynsym_count_; | |
75f65a3e ILT |
2696 | } |
2697 | ||
ef15dade ST |
2698 | // If Symbols_data is not NULL get the section flags from here otherwise |
2699 | // get it from the file. | |
2700 | ||
2701 | template<int size, bool big_endian> | |
2702 | uint64_t | |
6fa2a40b | 2703 | Sized_relobj_file<size, big_endian>::do_section_flags(unsigned int shndx) |
ef15dade ST |
2704 | { |
2705 | Symbols_data* sd = this->get_symbols_data(); | |
2706 | if (sd != NULL) | |
2707 | { | |
2708 | const unsigned char* pshdrs = sd->section_headers_data | |
2e702c99 | 2709 | + This::shdr_size * shndx; |
ef15dade | 2710 | typename This::Shdr shdr(pshdrs); |
2e702c99 | 2711 | return shdr.get_sh_flags(); |
ef15dade ST |
2712 | } |
2713 | // If sd is NULL, read the section header from the file. | |
2e702c99 | 2714 | return this->elf_file_.section_flags(shndx); |
ef15dade ST |
2715 | } |
2716 | ||
2717 | // Get the section's ent size from Symbols_data. Called by get_section_contents | |
2718 | // in icf.cc | |
2719 | ||
2720 | template<int size, bool big_endian> | |
2721 | uint64_t | |
6fa2a40b | 2722 | Sized_relobj_file<size, big_endian>::do_section_entsize(unsigned int shndx) |
ef15dade ST |
2723 | { |
2724 | Symbols_data* sd = this->get_symbols_data(); | |
ca09d69a | 2725 | gold_assert(sd != NULL); |
ef15dade ST |
2726 | |
2727 | const unsigned char* pshdrs = sd->section_headers_data | |
2e702c99 | 2728 | + This::shdr_size * shndx; |
ef15dade | 2729 | typename This::Shdr shdr(pshdrs); |
2e702c99 | 2730 | return shdr.get_sh_entsize(); |
ef15dade ST |
2731 | } |
2732 | ||
61ba1cf9 ILT |
2733 | // Write out the local symbols. |
2734 | ||
2735 | template<int size, bool big_endian> | |
2736 | void | |
6fa2a40b | 2737 | Sized_relobj_file<size, big_endian>::write_local_symbols( |
17a1d0a9 ILT |
2738 | Output_file* of, |
2739 | const Stringpool* sympool, | |
d491d34e ILT |
2740 | const Stringpool* dynpool, |
2741 | Output_symtab_xindex* symtab_xindex, | |
cdc29364 CC |
2742 | Output_symtab_xindex* dynsym_xindex, |
2743 | off_t symtab_off) | |
61ba1cf9 | 2744 | { |
99e9a495 ILT |
2745 | const bool strip_all = parameters->options().strip_all(); |
2746 | if (strip_all) | |
2747 | { | |
2748 | if (this->output_local_dynsym_count_ == 0) | |
2749 | return; | |
2750 | this->output_local_symbol_count_ = 0; | |
2751 | } | |
9e2dcb77 | 2752 | |
a3ad94ed | 2753 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 2754 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
2755 | { |
2756 | // This object has no symbols. Weird but legal. | |
2757 | return; | |
2758 | } | |
2759 | ||
2760 | // Read the symbol table section header. | |
2ea97941 | 2761 | const unsigned int symtab_shndx = this->symtab_shndx_; |
645f8123 | 2762 | typename This::Shdr symtabshdr(this, |
2ea97941 | 2763 | this->elf_file_.section_header(symtab_shndx)); |
a3ad94ed | 2764 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
92e059d8 | 2765 | const unsigned int loccount = this->local_symbol_count_; |
a3ad94ed | 2766 | gold_assert(loccount == symtabshdr.get_sh_info()); |
61ba1cf9 ILT |
2767 | |
2768 | // Read the local symbols. | |
2ea97941 ILT |
2769 | const int sym_size = This::sym_size; |
2770 | off_t locsize = loccount * sym_size; | |
61ba1cf9 | 2771 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
39d0cb0e | 2772 | locsize, true, false); |
61ba1cf9 | 2773 | |
61ba1cf9 | 2774 | // Read the symbol names. |
d491d34e ILT |
2775 | const unsigned int strtab_shndx = |
2776 | this->adjust_shndx(symtabshdr.get_sh_link()); | |
8383303e | 2777 | section_size_type strtab_size; |
645f8123 | 2778 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
9eb9fa57 | 2779 | &strtab_size, |
cb295612 | 2780 | false); |
61ba1cf9 ILT |
2781 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
2782 | ||
7bf1f802 ILT |
2783 | // Get views into the output file for the portions of the symbol table |
2784 | // and the dynamic symbol table that we will be writing. | |
2ea97941 | 2785 | off_t output_size = this->output_local_symbol_count_ * sym_size; |
f2619d6c | 2786 | unsigned char* oview = NULL; |
7bf1f802 | 2787 | if (output_size > 0) |
cdc29364 CC |
2788 | oview = of->get_output_view(symtab_off + this->local_symbol_offset_, |
2789 | output_size); | |
7bf1f802 | 2790 | |
2ea97941 | 2791 | off_t dyn_output_size = this->output_local_dynsym_count_ * sym_size; |
7bf1f802 ILT |
2792 | unsigned char* dyn_oview = NULL; |
2793 | if (dyn_output_size > 0) | |
2794 | dyn_oview = of->get_output_view(this->local_dynsym_offset_, | |
2e702c99 | 2795 | dyn_output_size); |
61ba1cf9 | 2796 | |
e0a1e121 | 2797 | const Output_sections& out_sections(this->output_sections()); |
c06b7b0b | 2798 | |
a3ad94ed | 2799 | gold_assert(this->local_values_.size() == loccount); |
61ba1cf9 | 2800 | |
61ba1cf9 | 2801 | unsigned char* ov = oview; |
7bf1f802 | 2802 | unsigned char* dyn_ov = dyn_oview; |
2ea97941 ILT |
2803 | psyms += sym_size; |
2804 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) | |
61ba1cf9 ILT |
2805 | { |
2806 | elfcpp::Sym<size, big_endian> isym(psyms); | |
f6ce93d6 | 2807 | |
d491d34e ILT |
2808 | Symbol_value<size>& lv(this->local_values_[i]); |
2809 | ||
2810 | bool is_ordinary; | |
2811 | unsigned int st_shndx = this->adjust_sym_shndx(i, isym.get_st_shndx(), | |
2812 | &is_ordinary); | |
2813 | if (is_ordinary) | |
61ba1cf9 | 2814 | { |
ef9beddf ILT |
2815 | gold_assert(st_shndx < out_sections.size()); |
2816 | if (out_sections[st_shndx] == NULL) | |
61ba1cf9 | 2817 | continue; |
ef9beddf | 2818 | st_shndx = out_sections[st_shndx]->out_shndx(); |
d491d34e ILT |
2819 | if (st_shndx >= elfcpp::SHN_LORESERVE) |
2820 | { | |
d3bbad62 | 2821 | if (lv.has_output_symtab_entry()) |
d491d34e | 2822 | symtab_xindex->add(lv.output_symtab_index(), st_shndx); |
d3bbad62 | 2823 | if (lv.has_output_dynsym_entry()) |
d491d34e ILT |
2824 | dynsym_xindex->add(lv.output_dynsym_index(), st_shndx); |
2825 | st_shndx = elfcpp::SHN_XINDEX; | |
2826 | } | |
61ba1cf9 ILT |
2827 | } |
2828 | ||
7bf1f802 | 2829 | // Write the symbol to the output symbol table. |
d3bbad62 | 2830 | if (lv.has_output_symtab_entry()) |
2e702c99 RM |
2831 | { |
2832 | elfcpp::Sym_write<size, big_endian> osym(ov); | |
2833 | ||
2834 | gold_assert(isym.get_st_name() < strtab_size); | |
2835 | const char* name = pnames + isym.get_st_name(); | |
2836 | osym.put_st_name(sympool->get_offset(name)); | |
033bfb73 | 2837 | osym.put_st_value(lv.value(this, 0)); |
2e702c99 RM |
2838 | osym.put_st_size(isym.get_st_size()); |
2839 | osym.put_st_info(isym.get_st_info()); | |
2840 | osym.put_st_other(isym.get_st_other()); | |
2841 | osym.put_st_shndx(st_shndx); | |
2842 | ||
2843 | ov += sym_size; | |
2844 | } | |
7bf1f802 ILT |
2845 | |
2846 | // Write the symbol to the output dynamic symbol table. | |
d3bbad62 | 2847 | if (lv.has_output_dynsym_entry()) |
2e702c99 RM |
2848 | { |
2849 | gold_assert(dyn_ov < dyn_oview + dyn_output_size); | |
2850 | elfcpp::Sym_write<size, big_endian> osym(dyn_ov); | |
2851 | ||
2852 | gold_assert(isym.get_st_name() < strtab_size); | |
2853 | const char* name = pnames + isym.get_st_name(); | |
2854 | osym.put_st_name(dynpool->get_offset(name)); | |
033bfb73 | 2855 | osym.put_st_value(lv.value(this, 0)); |
2e702c99 RM |
2856 | osym.put_st_size(isym.get_st_size()); |
2857 | osym.put_st_info(isym.get_st_info()); | |
2858 | osym.put_st_other(isym.get_st_other()); | |
2859 | osym.put_st_shndx(st_shndx); | |
2860 | ||
2861 | dyn_ov += sym_size; | |
2862 | } | |
7bf1f802 | 2863 | } |
f6ce93d6 | 2864 | |
61ba1cf9 | 2865 | |
7bf1f802 ILT |
2866 | if (output_size > 0) |
2867 | { | |
2868 | gold_assert(ov - oview == output_size); | |
cdc29364 CC |
2869 | of->write_output_view(symtab_off + this->local_symbol_offset_, |
2870 | output_size, oview); | |
61ba1cf9 ILT |
2871 | } |
2872 | ||
7bf1f802 ILT |
2873 | if (dyn_output_size > 0) |
2874 | { | |
2875 | gold_assert(dyn_ov - dyn_oview == dyn_output_size); | |
2876 | of->write_output_view(this->local_dynsym_offset_, dyn_output_size, | |
2e702c99 | 2877 | dyn_oview); |
7bf1f802 | 2878 | } |
61ba1cf9 ILT |
2879 | } |
2880 | ||
f7e2ee48 ILT |
2881 | // Set *INFO to symbolic information about the offset OFFSET in the |
2882 | // section SHNDX. Return true if we found something, false if we | |
2883 | // found nothing. | |
2884 | ||
2885 | template<int size, bool big_endian> | |
2886 | bool | |
6fa2a40b | 2887 | Sized_relobj_file<size, big_endian>::get_symbol_location_info( |
f7e2ee48 | 2888 | unsigned int shndx, |
2ea97941 | 2889 | off_t offset, |
f7e2ee48 ILT |
2890 | Symbol_location_info* info) |
2891 | { | |
2892 | if (this->symtab_shndx_ == 0) | |
2893 | return false; | |
2894 | ||
8383303e | 2895 | section_size_type symbols_size; |
f7e2ee48 ILT |
2896 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, |
2897 | &symbols_size, | |
2898 | false); | |
2899 | ||
d491d34e ILT |
2900 | unsigned int symbol_names_shndx = |
2901 | this->adjust_shndx(this->section_link(this->symtab_shndx_)); | |
8383303e | 2902 | section_size_type names_size; |
f7e2ee48 ILT |
2903 | const unsigned char* symbol_names_u = |
2904 | this->section_contents(symbol_names_shndx, &names_size, false); | |
2905 | const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u); | |
2906 | ||
2ea97941 ILT |
2907 | const int sym_size = This::sym_size; |
2908 | const size_t count = symbols_size / sym_size; | |
f7e2ee48 ILT |
2909 | |
2910 | const unsigned char* p = symbols; | |
2ea97941 | 2911 | for (size_t i = 0; i < count; ++i, p += sym_size) |
f7e2ee48 ILT |
2912 | { |
2913 | elfcpp::Sym<size, big_endian> sym(p); | |
2914 | ||
2915 | if (sym.get_st_type() == elfcpp::STT_FILE) | |
2916 | { | |
2917 | if (sym.get_st_name() >= names_size) | |
2918 | info->source_file = "(invalid)"; | |
2919 | else | |
2920 | info->source_file = symbol_names + sym.get_st_name(); | |
d491d34e | 2921 | continue; |
f7e2ee48 | 2922 | } |
d491d34e ILT |
2923 | |
2924 | bool is_ordinary; | |
2925 | unsigned int st_shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(), | |
2926 | &is_ordinary); | |
2927 | if (is_ordinary | |
2928 | && st_shndx == shndx | |
2ea97941 | 2929 | && static_cast<off_t>(sym.get_st_value()) <= offset |
d491d34e | 2930 | && (static_cast<off_t>(sym.get_st_value() + sym.get_st_size()) |
2ea97941 | 2931 | > offset)) |
2e702c99 | 2932 | { |
60e8b3fc | 2933 | info->enclosing_symbol_type = sym.get_st_type(); |
2e702c99 | 2934 | if (sym.get_st_name() > names_size) |
f7e2ee48 ILT |
2935 | info->enclosing_symbol_name = "(invalid)"; |
2936 | else | |
2e702c99 RM |
2937 | { |
2938 | info->enclosing_symbol_name = symbol_names + sym.get_st_name(); | |
2939 | if (parameters->options().do_demangle()) | |
2940 | { | |
2941 | char* demangled_name = cplus_demangle( | |
2942 | info->enclosing_symbol_name.c_str(), | |
2943 | DMGL_ANSI | DMGL_PARAMS); | |
2944 | if (demangled_name != NULL) | |
2945 | { | |
2946 | info->enclosing_symbol_name.assign(demangled_name); | |
2947 | free(demangled_name); | |
2948 | } | |
2949 | } | |
2950 | } | |
f7e2ee48 | 2951 | return true; |
2e702c99 | 2952 | } |
f7e2ee48 ILT |
2953 | } |
2954 | ||
2955 | return false; | |
2956 | } | |
2957 | ||
e94cf127 CC |
2958 | // Look for a kept section corresponding to the given discarded section, |
2959 | // and return its output address. This is used only for relocations in | |
2960 | // debugging sections. If we can't find the kept section, return 0. | |
2961 | ||
2962 | template<int size, bool big_endian> | |
6fa2a40b CC |
2963 | typename Sized_relobj_file<size, big_endian>::Address |
2964 | Sized_relobj_file<size, big_endian>::map_to_kept_section( | |
e94cf127 | 2965 | unsigned int shndx, |
43193fe9 CC |
2966 | std::string& section_name, |
2967 | bool* pfound) const | |
e94cf127 | 2968 | { |
43193fe9 CC |
2969 | Kept_section* kept_section; |
2970 | bool is_comdat; | |
2971 | uint64_t sh_size; | |
2972 | unsigned int symndx; | |
2973 | bool found = false; | |
2974 | ||
2975 | if (this->get_kept_comdat_section(shndx, &is_comdat, &symndx, &sh_size, | |
2976 | &kept_section)) | |
2977 | { | |
2978 | Relobj* kept_object = kept_section->object(); | |
2979 | unsigned int kept_shndx = 0; | |
2980 | if (!kept_section->is_comdat()) | |
2981 | { | |
2982 | // The kept section is a linkonce section. | |
2983 | if (sh_size == kept_section->linkonce_size()) | |
2984 | found = true; | |
2985 | } | |
2986 | else | |
2987 | { | |
2988 | if (is_comdat) | |
2989 | { | |
2990 | // Find the corresponding kept section. | |
2991 | // Since we're using this mapping for relocation processing, | |
2992 | // we don't want to match sections unless they have the same | |
2993 | // size. | |
f6f9ed01 | 2994 | uint64_t kept_size = 0; |
43193fe9 CC |
2995 | if (kept_section->find_comdat_section(section_name, &kept_shndx, |
2996 | &kept_size)) | |
2997 | { | |
2998 | if (sh_size == kept_size) | |
2999 | found = true; | |
3000 | } | |
3001 | } | |
3002 | else | |
3003 | { | |
f6f9ed01 | 3004 | uint64_t kept_size = 0; |
43193fe9 CC |
3005 | if (kept_section->find_single_comdat_section(&kept_shndx, |
3006 | &kept_size) | |
3007 | && sh_size == kept_size) | |
3008 | found = true; | |
3009 | } | |
3010 | } | |
3011 | ||
3012 | if (found) | |
1ef4d87f | 3013 | { |
43193fe9 CC |
3014 | Sized_relobj_file<size, big_endian>* kept_relobj = |
3015 | static_cast<Sized_relobj_file<size, big_endian>*>(kept_object); | |
3016 | Output_section* os = kept_relobj->output_section(kept_shndx); | |
3017 | Address offset = kept_relobj->get_output_section_offset(kept_shndx); | |
3018 | if (os != NULL && offset != invalid_address) | |
3019 | { | |
3020 | *pfound = true; | |
3021 | return os->address() + offset; | |
3022 | } | |
1ef4d87f | 3023 | } |
e94cf127 | 3024 | } |
43193fe9 | 3025 | *pfound = false; |
e94cf127 CC |
3026 | return 0; |
3027 | } | |
3028 | ||
43193fe9 CC |
3029 | // Look for a kept section corresponding to the given discarded section, |
3030 | // and return its object file. | |
3031 | ||
3032 | template<int size, bool big_endian> | |
3033 | Relobj* | |
3034 | Sized_relobj_file<size, big_endian>::find_kept_section_object( | |
3035 | unsigned int shndx, unsigned int *symndx_p) const | |
3036 | { | |
3037 | Kept_section* kept_section; | |
3038 | bool is_comdat; | |
3039 | uint64_t sh_size; | |
3040 | if (this->get_kept_comdat_section(shndx, &is_comdat, symndx_p, &sh_size, | |
3041 | &kept_section)) | |
3042 | return kept_section->object(); | |
3043 | return NULL; | |
3044 | } | |
3045 | ||
3046 | // Return the name of symbol SYMNDX. | |
3047 | ||
3048 | template<int size, bool big_endian> | |
3049 | const char* | |
3050 | Sized_relobj_file<size, big_endian>::get_symbol_name(unsigned int symndx) | |
3051 | { | |
3052 | if (this->symtab_shndx_ == 0) | |
3053 | return NULL; | |
3054 | ||
3055 | section_size_type symbols_size; | |
3056 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, | |
3057 | &symbols_size, | |
3058 | false); | |
3059 | ||
3060 | unsigned int symbol_names_shndx = | |
3061 | this->adjust_shndx(this->section_link(this->symtab_shndx_)); | |
3062 | section_size_type names_size; | |
3063 | const unsigned char* symbol_names_u = | |
3064 | this->section_contents(symbol_names_shndx, &names_size, false); | |
3065 | const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u); | |
3066 | ||
3067 | const unsigned char* p = symbols + symndx * This::sym_size; | |
3068 | ||
3069 | if (p >= symbols + symbols_size) | |
3070 | return NULL; | |
3071 | ||
3072 | elfcpp::Sym<size, big_endian> sym(p); | |
3073 | ||
3074 | return symbol_names + sym.get_st_name(); | |
3075 | } | |
3076 | ||
92de84a6 ILT |
3077 | // Get symbol counts. |
3078 | ||
3079 | template<int size, bool big_endian> | |
3080 | void | |
6fa2a40b | 3081 | Sized_relobj_file<size, big_endian>::do_get_global_symbol_counts( |
92de84a6 ILT |
3082 | const Symbol_table*, |
3083 | size_t* defined, | |
3084 | size_t* used) const | |
3085 | { | |
3086 | *defined = this->defined_count_; | |
3087 | size_t count = 0; | |
cdc29364 | 3088 | for (typename Symbols::const_iterator p = this->symbols_.begin(); |
92de84a6 ILT |
3089 | p != this->symbols_.end(); |
3090 | ++p) | |
3091 | if (*p != NULL | |
3092 | && (*p)->source() == Symbol::FROM_OBJECT | |
3093 | && (*p)->object() == this | |
3094 | && (*p)->is_defined()) | |
3095 | ++count; | |
3096 | *used = count; | |
3097 | } | |
3098 | ||
5dd8762a CC |
3099 | // Return a view of the decompressed contents of a section. Set *PLEN |
3100 | // to the size. Set *IS_NEW to true if the contents need to be freed | |
3101 | // by the caller. | |
3102 | ||
5dd8762a | 3103 | const unsigned char* |
0d5bbdb0 | 3104 | Object::decompressed_section_contents( |
5dd8762a CC |
3105 | unsigned int shndx, |
3106 | section_size_type* plen, | |
5f6c22ae L |
3107 | bool* is_new, |
3108 | uint64_t* palign) | |
5dd8762a CC |
3109 | { |
3110 | section_size_type buffer_size; | |
c1027032 CC |
3111 | const unsigned char* buffer = this->do_section_contents(shndx, &buffer_size, |
3112 | false); | |
5dd8762a CC |
3113 | |
3114 | if (this->compressed_sections_ == NULL) | |
3115 | { | |
3116 | *plen = buffer_size; | |
3117 | *is_new = false; | |
3118 | return buffer; | |
3119 | } | |
3120 | ||
3121 | Compressed_section_map::const_iterator p = | |
3122 | this->compressed_sections_->find(shndx); | |
3123 | if (p == this->compressed_sections_->end()) | |
3124 | { | |
3125 | *plen = buffer_size; | |
3126 | *is_new = false; | |
3127 | return buffer; | |
3128 | } | |
3129 | ||
3130 | section_size_type uncompressed_size = p->second.size; | |
3131 | if (p->second.contents != NULL) | |
3132 | { | |
3133 | *plen = uncompressed_size; | |
3134 | *is_new = false; | |
5f6c22ae L |
3135 | if (palign != NULL) |
3136 | *palign = p->second.addralign; | |
5dd8762a CC |
3137 | return p->second.contents; |
3138 | } | |
3139 | ||
3140 | unsigned char* uncompressed_data = new unsigned char[uncompressed_size]; | |
3141 | if (!decompress_input_section(buffer, | |
3142 | buffer_size, | |
3143 | uncompressed_data, | |
48058663 L |
3144 | uncompressed_size, |
3145 | elfsize(), | |
3146 | is_big_endian(), | |
3147 | p->second.flag)) | |
5dd8762a CC |
3148 | this->error(_("could not decompress section %s"), |
3149 | this->do_section_name(shndx).c_str()); | |
3150 | ||
3151 | // We could cache the results in p->second.contents and store | |
3152 | // false in *IS_NEW, but build_compressed_section_map() would | |
3153 | // have done so if it had expected it to be profitable. If | |
3154 | // we reach this point, we expect to need the contents only | |
3155 | // once in this pass. | |
3156 | *plen = uncompressed_size; | |
3157 | *is_new = true; | |
5f6c22ae L |
3158 | if (palign != NULL) |
3159 | *palign = p->second.addralign; | |
5dd8762a CC |
3160 | return uncompressed_data; |
3161 | } | |
3162 | ||
3163 | // Discard any buffers of uncompressed sections. This is done | |
3164 | // at the end of the Add_symbols task. | |
3165 | ||
5dd8762a | 3166 | void |
0d5bbdb0 | 3167 | Object::discard_decompressed_sections() |
5dd8762a CC |
3168 | { |
3169 | if (this->compressed_sections_ == NULL) | |
3170 | return; | |
3171 | ||
3172 | for (Compressed_section_map::iterator p = this->compressed_sections_->begin(); | |
3173 | p != this->compressed_sections_->end(); | |
3174 | ++p) | |
3175 | { | |
3176 | if (p->second.contents != NULL) | |
2e702c99 RM |
3177 | { |
3178 | delete[] p->second.contents; | |
3179 | p->second.contents = NULL; | |
3180 | } | |
5dd8762a CC |
3181 | } |
3182 | } | |
3183 | ||
54dc6425 ILT |
3184 | // Input_objects methods. |
3185 | ||
008db82e ILT |
3186 | // Add a regular relocatable object to the list. Return false if this |
3187 | // object should be ignored. | |
f6ce93d6 | 3188 | |
008db82e | 3189 | bool |
54dc6425 ILT |
3190 | Input_objects::add_object(Object* obj) |
3191 | { | |
c5818ff1 CC |
3192 | // Print the filename if the -t/--trace option is selected. |
3193 | if (parameters->options().trace()) | |
3194 | gold_info("%s", obj->name().c_str()); | |
3195 | ||
008db82e | 3196 | if (!obj->is_dynamic()) |
f6ce93d6 | 3197 | this->relobj_list_.push_back(static_cast<Relobj*>(obj)); |
008db82e ILT |
3198 | else |
3199 | { | |
3200 | // See if this is a duplicate SONAME. | |
3201 | Dynobj* dynobj = static_cast<Dynobj*>(obj); | |
9a2d6984 | 3202 | const char* soname = dynobj->soname(); |
008db82e | 3203 | |
4bfacfd3 CC |
3204 | Unordered_map<std::string, Object*>::value_type val(soname, obj); |
3205 | std::pair<Unordered_map<std::string, Object*>::iterator, bool> ins = | |
3206 | this->sonames_.insert(val); | |
008db82e ILT |
3207 | if (!ins.second) |
3208 | { | |
3209 | // We have already seen a dynamic object with this soname. | |
4bfacfd3 CC |
3210 | // If any instances of this object on the command line have |
3211 | // the --no-as-needed flag, make sure the one we keep is | |
3212 | // marked so. | |
3213 | if (!obj->as_needed()) | |
3214 | { | |
3215 | gold_assert(ins.first->second != NULL); | |
3216 | ins.first->second->clear_as_needed(); | |
3217 | } | |
008db82e ILT |
3218 | return false; |
3219 | } | |
3220 | ||
3221 | this->dynobj_list_.push_back(dynobj); | |
3222 | } | |
75f65a3e | 3223 | |
92de84a6 | 3224 | // Add this object to the cross-referencer if requested. |
dde3f402 ILT |
3225 | if (parameters->options().user_set_print_symbol_counts() |
3226 | || parameters->options().cref()) | |
92de84a6 ILT |
3227 | { |
3228 | if (this->cref_ == NULL) | |
3229 | this->cref_ = new Cref(); | |
3230 | this->cref_->add_object(obj); | |
3231 | } | |
3232 | ||
008db82e | 3233 | return true; |
54dc6425 ILT |
3234 | } |
3235 | ||
e2827e5f ILT |
3236 | // For each dynamic object, record whether we've seen all of its |
3237 | // explicit dependencies. | |
3238 | ||
3239 | void | |
3240 | Input_objects::check_dynamic_dependencies() const | |
3241 | { | |
7eaea549 | 3242 | bool issued_copy_dt_needed_error = false; |
e2827e5f ILT |
3243 | for (Dynobj_list::const_iterator p = this->dynobj_list_.begin(); |
3244 | p != this->dynobj_list_.end(); | |
3245 | ++p) | |
3246 | { | |
3247 | const Dynobj::Needed& needed((*p)->needed()); | |
3248 | bool found_all = true; | |
7eaea549 ILT |
3249 | Dynobj::Needed::const_iterator pneeded; |
3250 | for (pneeded = needed.begin(); pneeded != needed.end(); ++pneeded) | |
e2827e5f ILT |
3251 | { |
3252 | if (this->sonames_.find(*pneeded) == this->sonames_.end()) | |
3253 | { | |
3254 | found_all = false; | |
3255 | break; | |
3256 | } | |
3257 | } | |
3258 | (*p)->set_has_unknown_needed_entries(!found_all); | |
7eaea549 ILT |
3259 | |
3260 | // --copy-dt-needed-entries aka --add-needed is a GNU ld option | |
612bdda1 ILT |
3261 | // that gold does not support. However, they cause no trouble |
3262 | // unless there is a DT_NEEDED entry that we don't know about; | |
3263 | // warn only in that case. | |
7eaea549 ILT |
3264 | if (!found_all |
3265 | && !issued_copy_dt_needed_error | |
3266 | && (parameters->options().copy_dt_needed_entries() | |
3267 | || parameters->options().add_needed())) | |
3268 | { | |
3269 | const char* optname; | |
3270 | if (parameters->options().copy_dt_needed_entries()) | |
3271 | optname = "--copy-dt-needed-entries"; | |
3272 | else | |
3273 | optname = "--add-needed"; | |
3274 | gold_error(_("%s is not supported but is required for %s in %s"), | |
3275 | optname, (*pneeded).c_str(), (*p)->name().c_str()); | |
3276 | issued_copy_dt_needed_error = true; | |
3277 | } | |
e2827e5f ILT |
3278 | } |
3279 | } | |
3280 | ||
92de84a6 ILT |
3281 | // Start processing an archive. |
3282 | ||
3283 | void | |
3284 | Input_objects::archive_start(Archive* archive) | |
3285 | { | |
dde3f402 ILT |
3286 | if (parameters->options().user_set_print_symbol_counts() |
3287 | || parameters->options().cref()) | |
92de84a6 ILT |
3288 | { |
3289 | if (this->cref_ == NULL) | |
3290 | this->cref_ = new Cref(); | |
3291 | this->cref_->add_archive_start(archive); | |
3292 | } | |
3293 | } | |
3294 | ||
3295 | // Stop processing an archive. | |
3296 | ||
3297 | void | |
3298 | Input_objects::archive_stop(Archive* archive) | |
3299 | { | |
dde3f402 ILT |
3300 | if (parameters->options().user_set_print_symbol_counts() |
3301 | || parameters->options().cref()) | |
92de84a6 ILT |
3302 | this->cref_->add_archive_stop(archive); |
3303 | } | |
3304 | ||
3305 | // Print symbol counts | |
3306 | ||
3307 | void | |
3308 | Input_objects::print_symbol_counts(const Symbol_table* symtab) const | |
3309 | { | |
3310 | if (parameters->options().user_set_print_symbol_counts() | |
3311 | && this->cref_ != NULL) | |
3312 | this->cref_->print_symbol_counts(symtab); | |
3313 | } | |
3314 | ||
dde3f402 ILT |
3315 | // Print a cross reference table. |
3316 | ||
3317 | void | |
3318 | Input_objects::print_cref(const Symbol_table* symtab, FILE* f) const | |
3319 | { | |
3320 | if (parameters->options().cref() && this->cref_ != NULL) | |
3321 | this->cref_->print_cref(symtab, f); | |
3322 | } | |
3323 | ||
92e059d8 ILT |
3324 | // Relocate_info methods. |
3325 | ||
308ecdc7 ILT |
3326 | // Return a string describing the location of a relocation when file |
3327 | // and lineno information is not available. This is only used in | |
3328 | // error messages. | |
92e059d8 ILT |
3329 | |
3330 | template<int size, bool big_endian> | |
3331 | std::string | |
f7e2ee48 | 3332 | Relocate_info<size, big_endian>::location(size_t, off_t offset) const |
92e059d8 | 3333 | { |
a55ce7fe | 3334 | Sized_dwarf_line_info<size, big_endian> line_info(this->object); |
308ecdc7 ILT |
3335 | std::string ret = line_info.addr2line(this->data_shndx, offset, NULL); |
3336 | if (!ret.empty()) | |
3337 | return ret; | |
3338 | ||
3339 | ret = this->object->name(); | |
4c50553d | 3340 | |
f7e2ee48 ILT |
3341 | Symbol_location_info info; |
3342 | if (this->object->get_symbol_location_info(this->data_shndx, offset, &info)) | |
3343 | { | |
308ecdc7 ILT |
3344 | if (!info.source_file.empty()) |
3345 | { | |
3346 | ret += ":"; | |
3347 | ret += info.source_file; | |
3348 | } | |
60e8b3fc CC |
3349 | ret += ":"; |
3350 | if (info.enclosing_symbol_type == elfcpp::STT_FUNC) | |
3351 | ret += _("function "); | |
3352 | ret += info.enclosing_symbol_name; | |
308ecdc7 | 3353 | return ret; |
f7e2ee48 | 3354 | } |
308ecdc7 ILT |
3355 | |
3356 | ret += "("; | |
3357 | ret += this->object->section_name(this->data_shndx); | |
3358 | char buf[100]; | |
3359 | snprintf(buf, sizeof buf, "+0x%lx)", static_cast<long>(offset)); | |
3360 | ret += buf; | |
92e059d8 ILT |
3361 | return ret; |
3362 | } | |
3363 | ||
bae7f79e ILT |
3364 | } // End namespace gold. |
3365 | ||
3366 | namespace | |
3367 | { | |
3368 | ||
3369 | using namespace gold; | |
3370 | ||
3371 | // Read an ELF file with the header and return the appropriate | |
3372 | // instance of Object. | |
3373 | ||
3374 | template<int size, bool big_endian> | |
3375 | Object* | |
3376 | make_elf_sized_object(const std::string& name, Input_file* input_file, | |
029ba973 ILT |
3377 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr, |
3378 | bool* punconfigured) | |
bae7f79e | 3379 | { |
2e702c99 RM |
3380 | Target* target = select_target(input_file, offset, |
3381 | ehdr.get_e_machine(), size, big_endian, | |
f733487b DK |
3382 | ehdr.get_e_ident()[elfcpp::EI_OSABI], |
3383 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); | |
3384 | if (target == NULL) | |
3385 | gold_fatal(_("%s: unsupported ELF machine number %d"), | |
3386 | name.c_str(), ehdr.get_e_machine()); | |
029ba973 ILT |
3387 | |
3388 | if (!parameters->target_valid()) | |
3389 | set_parameters_target(target); | |
3390 | else if (target != ¶meters->target()) | |
3391 | { | |
3392 | if (punconfigured != NULL) | |
3393 | *punconfigured = true; | |
3394 | else | |
3395 | gold_error(_("%s: incompatible target"), name.c_str()); | |
3396 | return NULL; | |
3397 | } | |
3398 | ||
f733487b DK |
3399 | return target->make_elf_object<size, big_endian>(name, input_file, offset, |
3400 | ehdr); | |
bae7f79e ILT |
3401 | } |
3402 | ||
3403 | } // End anonymous namespace. | |
3404 | ||
3405 | namespace gold | |
3406 | { | |
3407 | ||
f6060a4d ILT |
3408 | // Return whether INPUT_FILE is an ELF object. |
3409 | ||
3410 | bool | |
3411 | is_elf_object(Input_file* input_file, off_t offset, | |
ca09d69a | 3412 | const unsigned char** start, int* read_size) |
f6060a4d ILT |
3413 | { |
3414 | off_t filesize = input_file->file().filesize(); | |
c549a694 | 3415 | int want = elfcpp::Elf_recognizer::max_header_size; |
f6060a4d ILT |
3416 | if (filesize - offset < want) |
3417 | want = filesize - offset; | |
3418 | ||
3419 | const unsigned char* p = input_file->file().get_view(offset, 0, want, | |
3420 | true, false); | |
3421 | *start = p; | |
3422 | *read_size = want; | |
3423 | ||
c549a694 | 3424 | return elfcpp::Elf_recognizer::is_elf_file(p, want); |
f6060a4d ILT |
3425 | } |
3426 | ||
bae7f79e ILT |
3427 | // Read an ELF file and return the appropriate instance of Object. |
3428 | ||
3429 | Object* | |
3430 | make_elf_object(const std::string& name, Input_file* input_file, off_t offset, | |
15f8229b ILT |
3431 | const unsigned char* p, section_offset_type bytes, |
3432 | bool* punconfigured) | |
bae7f79e | 3433 | { |
15f8229b ILT |
3434 | if (punconfigured != NULL) |
3435 | *punconfigured = false; | |
3436 | ||
c549a694 | 3437 | std::string error; |
ac33a407 DK |
3438 | bool big_endian = false; |
3439 | int size = 0; | |
c549a694 | 3440 | if (!elfcpp::Elf_recognizer::is_valid_header(p, bytes, &size, |
2e702c99 | 3441 | &big_endian, &error)) |
bae7f79e | 3442 | { |
c549a694 | 3443 | gold_error(_("%s: %s"), name.c_str(), error.c_str()); |
75f2446e | 3444 | return NULL; |
bae7f79e ILT |
3445 | } |
3446 | ||
c549a694 | 3447 | if (size == 32) |
bae7f79e | 3448 | { |
bae7f79e ILT |
3449 | if (big_endian) |
3450 | { | |
193a53d9 | 3451 | #ifdef HAVE_TARGET_32_BIG |
bae7f79e ILT |
3452 | elfcpp::Ehdr<32, true> ehdr(p); |
3453 | return make_elf_sized_object<32, true>(name, input_file, | |
029ba973 | 3454 | offset, ehdr, punconfigured); |
193a53d9 | 3455 | #else |
15f8229b ILT |
3456 | if (punconfigured != NULL) |
3457 | *punconfigured = true; | |
3458 | else | |
3459 | gold_error(_("%s: not configured to support " | |
3460 | "32-bit big-endian object"), | |
3461 | name.c_str()); | |
75f2446e | 3462 | return NULL; |
193a53d9 | 3463 | #endif |
bae7f79e ILT |
3464 | } |
3465 | else | |
3466 | { | |
193a53d9 | 3467 | #ifdef HAVE_TARGET_32_LITTLE |
bae7f79e ILT |
3468 | elfcpp::Ehdr<32, false> ehdr(p); |
3469 | return make_elf_sized_object<32, false>(name, input_file, | |
029ba973 | 3470 | offset, ehdr, punconfigured); |
193a53d9 | 3471 | #else |
15f8229b ILT |
3472 | if (punconfigured != NULL) |
3473 | *punconfigured = true; | |
3474 | else | |
3475 | gold_error(_("%s: not configured to support " | |
3476 | "32-bit little-endian object"), | |
3477 | name.c_str()); | |
75f2446e | 3478 | return NULL; |
193a53d9 | 3479 | #endif |
bae7f79e ILT |
3480 | } |
3481 | } | |
c549a694 | 3482 | else if (size == 64) |
bae7f79e | 3483 | { |
bae7f79e ILT |
3484 | if (big_endian) |
3485 | { | |
193a53d9 | 3486 | #ifdef HAVE_TARGET_64_BIG |
bae7f79e ILT |
3487 | elfcpp::Ehdr<64, true> ehdr(p); |
3488 | return make_elf_sized_object<64, true>(name, input_file, | |
029ba973 | 3489 | offset, ehdr, punconfigured); |
193a53d9 | 3490 | #else |
15f8229b ILT |
3491 | if (punconfigured != NULL) |
3492 | *punconfigured = true; | |
3493 | else | |
3494 | gold_error(_("%s: not configured to support " | |
3495 | "64-bit big-endian object"), | |
3496 | name.c_str()); | |
75f2446e | 3497 | return NULL; |
193a53d9 | 3498 | #endif |
bae7f79e ILT |
3499 | } |
3500 | else | |
3501 | { | |
193a53d9 | 3502 | #ifdef HAVE_TARGET_64_LITTLE |
bae7f79e ILT |
3503 | elfcpp::Ehdr<64, false> ehdr(p); |
3504 | return make_elf_sized_object<64, false>(name, input_file, | |
029ba973 | 3505 | offset, ehdr, punconfigured); |
193a53d9 | 3506 | #else |
15f8229b ILT |
3507 | if (punconfigured != NULL) |
3508 | *punconfigured = true; | |
3509 | else | |
3510 | gold_error(_("%s: not configured to support " | |
3511 | "64-bit little-endian object"), | |
3512 | name.c_str()); | |
75f2446e | 3513 | return NULL; |
193a53d9 | 3514 | #endif |
bae7f79e ILT |
3515 | } |
3516 | } | |
c549a694 ILT |
3517 | else |
3518 | gold_unreachable(); | |
bae7f79e ILT |
3519 | } |
3520 | ||
04bf7072 ILT |
3521 | // Instantiate the templates we need. |
3522 | ||
dbe40a88 RÁE |
3523 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) |
3524 | template | |
3525 | void | |
3526 | Relobj::initialize_input_to_output_map<64>(unsigned int shndx, | |
beb8418f | 3527 | elfcpp::Elf_types<64>::Elf_Addr starting_address, |
dbe40a88 | 3528 | Unordered_map<section_offset_type, |
beb8418f | 3529 | elfcpp::Elf_types<64>::Elf_Addr>* output_addresses) const; |
dbe40a88 RÁE |
3530 | #endif |
3531 | ||
3532 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
3533 | template | |
3534 | void | |
3535 | Relobj::initialize_input_to_output_map<32>(unsigned int shndx, | |
beb8418f | 3536 | elfcpp::Elf_types<32>::Elf_Addr starting_address, |
dbe40a88 | 3537 | Unordered_map<section_offset_type, |
beb8418f | 3538 | elfcpp::Elf_types<32>::Elf_Addr>* output_addresses) const; |
dbe40a88 RÁE |
3539 | #endif |
3540 | ||
04bf7072 ILT |
3541 | #ifdef HAVE_TARGET_32_LITTLE |
3542 | template | |
3543 | void | |
3544 | Object::read_section_data<32, false>(elfcpp::Elf_file<32, false, Object>*, | |
3545 | Read_symbols_data*); | |
dc3714f3 AM |
3546 | template |
3547 | const unsigned char* | |
3548 | Object::find_shdr<32,false>(const unsigned char*, const char*, const char*, | |
3549 | section_size_type, const unsigned char*) const; | |
04bf7072 ILT |
3550 | #endif |
3551 | ||
3552 | #ifdef HAVE_TARGET_32_BIG | |
3553 | template | |
3554 | void | |
3555 | Object::read_section_data<32, true>(elfcpp::Elf_file<32, true, Object>*, | |
3556 | Read_symbols_data*); | |
dc3714f3 AM |
3557 | template |
3558 | const unsigned char* | |
3559 | Object::find_shdr<32,true>(const unsigned char*, const char*, const char*, | |
3560 | section_size_type, const unsigned char*) const; | |
04bf7072 ILT |
3561 | #endif |
3562 | ||
3563 | #ifdef HAVE_TARGET_64_LITTLE | |
3564 | template | |
3565 | void | |
3566 | Object::read_section_data<64, false>(elfcpp::Elf_file<64, false, Object>*, | |
3567 | Read_symbols_data*); | |
dc3714f3 AM |
3568 | template |
3569 | const unsigned char* | |
3570 | Object::find_shdr<64,false>(const unsigned char*, const char*, const char*, | |
3571 | section_size_type, const unsigned char*) const; | |
04bf7072 ILT |
3572 | #endif |
3573 | ||
3574 | #ifdef HAVE_TARGET_64_BIG | |
3575 | template | |
3576 | void | |
3577 | Object::read_section_data<64, true>(elfcpp::Elf_file<64, true, Object>*, | |
3578 | Read_symbols_data*); | |
dc3714f3 AM |
3579 | template |
3580 | const unsigned char* | |
3581 | Object::find_shdr<64,true>(const unsigned char*, const char*, const char*, | |
3582 | section_size_type, const unsigned char*) const; | |
04bf7072 | 3583 | #endif |
bae7f79e | 3584 | |
193a53d9 | 3585 | #ifdef HAVE_TARGET_32_LITTLE |
c6905c28 CC |
3586 | template |
3587 | class Sized_relobj<32, false>; | |
3588 | ||
bae7f79e | 3589 | template |
6fa2a40b | 3590 | class Sized_relobj_file<32, false>; |
193a53d9 | 3591 | #endif |
bae7f79e | 3592 | |
193a53d9 | 3593 | #ifdef HAVE_TARGET_32_BIG |
c6905c28 CC |
3594 | template |
3595 | class Sized_relobj<32, true>; | |
3596 | ||
bae7f79e | 3597 | template |
6fa2a40b | 3598 | class Sized_relobj_file<32, true>; |
193a53d9 | 3599 | #endif |
bae7f79e | 3600 | |
193a53d9 | 3601 | #ifdef HAVE_TARGET_64_LITTLE |
c6905c28 CC |
3602 | template |
3603 | class Sized_relobj<64, false>; | |
3604 | ||
bae7f79e | 3605 | template |
6fa2a40b | 3606 | class Sized_relobj_file<64, false>; |
193a53d9 | 3607 | #endif |
bae7f79e | 3608 | |
193a53d9 | 3609 | #ifdef HAVE_TARGET_64_BIG |
c6905c28 CC |
3610 | template |
3611 | class Sized_relobj<64, true>; | |
3612 | ||
bae7f79e | 3613 | template |
6fa2a40b | 3614 | class Sized_relobj_file<64, true>; |
193a53d9 | 3615 | #endif |
bae7f79e | 3616 | |
193a53d9 | 3617 | #ifdef HAVE_TARGET_32_LITTLE |
92e059d8 ILT |
3618 | template |
3619 | struct Relocate_info<32, false>; | |
193a53d9 | 3620 | #endif |
92e059d8 | 3621 | |
193a53d9 | 3622 | #ifdef HAVE_TARGET_32_BIG |
92e059d8 ILT |
3623 | template |
3624 | struct Relocate_info<32, true>; | |
193a53d9 | 3625 | #endif |
92e059d8 | 3626 | |
193a53d9 | 3627 | #ifdef HAVE_TARGET_64_LITTLE |
92e059d8 ILT |
3628 | template |
3629 | struct Relocate_info<64, false>; | |
193a53d9 | 3630 | #endif |
92e059d8 | 3631 | |
193a53d9 | 3632 | #ifdef HAVE_TARGET_64_BIG |
92e059d8 ILT |
3633 | template |
3634 | struct Relocate_info<64, true>; | |
193a53d9 | 3635 | #endif |
92e059d8 | 3636 | |
9d3b86f6 ILT |
3637 | #ifdef HAVE_TARGET_32_LITTLE |
3638 | template | |
3639 | void | |
3640 | Xindex::initialize_symtab_xindex<32, false>(Object*, unsigned int); | |
3641 | ||
3642 | template | |
3643 | void | |
3644 | Xindex::read_symtab_xindex<32, false>(Object*, unsigned int, | |
3645 | const unsigned char*); | |
3646 | #endif | |
3647 | ||
3648 | #ifdef HAVE_TARGET_32_BIG | |
3649 | template | |
3650 | void | |
3651 | Xindex::initialize_symtab_xindex<32, true>(Object*, unsigned int); | |
3652 | ||
3653 | template | |
3654 | void | |
3655 | Xindex::read_symtab_xindex<32, true>(Object*, unsigned int, | |
3656 | const unsigned char*); | |
3657 | #endif | |
3658 | ||
3659 | #ifdef HAVE_TARGET_64_LITTLE | |
3660 | template | |
3661 | void | |
3662 | Xindex::initialize_symtab_xindex<64, false>(Object*, unsigned int); | |
3663 | ||
3664 | template | |
3665 | void | |
3666 | Xindex::read_symtab_xindex<64, false>(Object*, unsigned int, | |
3667 | const unsigned char*); | |
3668 | #endif | |
3669 | ||
3670 | #ifdef HAVE_TARGET_64_BIG | |
3671 | template | |
3672 | void | |
3673 | Xindex::initialize_symtab_xindex<64, true>(Object*, unsigned int); | |
3674 | ||
3675 | template | |
3676 | void | |
3677 | Xindex::read_symtab_xindex<64, true>(Object*, unsigned int, | |
3678 | const unsigned char*); | |
3679 | #endif | |
3680 | ||
265d97f7 CC |
3681 | #ifdef HAVE_TARGET_32_LITTLE |
3682 | template | |
3683 | Compressed_section_map* | |
3684 | build_compressed_section_map<32, false>(const unsigned char*, unsigned int, | |
3685 | const char*, section_size_type, | |
3686 | Object*, bool); | |
3687 | #endif | |
3688 | ||
3689 | #ifdef HAVE_TARGET_32_BIG | |
3690 | template | |
3691 | Compressed_section_map* | |
3692 | build_compressed_section_map<32, true>(const unsigned char*, unsigned int, | |
3693 | const char*, section_size_type, | |
3694 | Object*, bool); | |
3695 | #endif | |
3696 | ||
3697 | #ifdef HAVE_TARGET_64_LITTLE | |
3698 | template | |
3699 | Compressed_section_map* | |
3700 | build_compressed_section_map<64, false>(const unsigned char*, unsigned int, | |
3701 | const char*, section_size_type, | |
3702 | Object*, bool); | |
3703 | #endif | |
3704 | ||
3705 | #ifdef HAVE_TARGET_64_BIG | |
3706 | template | |
3707 | Compressed_section_map* | |
3708 | build_compressed_section_map<64, true>(const unsigned char*, unsigned int, | |
3709 | const char*, section_size_type, | |
3710 | Object*, bool); | |
3711 | #endif | |
3712 | ||
bae7f79e | 3713 | } // End namespace gold. |