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bae7f79e ILT |
1 | // object.cc -- support for an object file for linking in gold |
2 | ||
dde3f402 | 3 | // Copyright 2006, 2007, 2008, 2009, 2010 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" |
bae7f79e ILT |
44 | |
45 | namespace gold | |
46 | { | |
47 | ||
00698fc5 CC |
48 | // Struct Read_symbols_data. |
49 | ||
50 | // Destroy any remaining File_view objects. | |
51 | ||
52 | Read_symbols_data::~Read_symbols_data() | |
53 | { | |
54 | if (this->section_headers != NULL) | |
55 | delete this->section_headers; | |
56 | if (this->section_names != NULL) | |
57 | delete this->section_names; | |
58 | if (this->symbols != NULL) | |
59 | delete this->symbols; | |
60 | if (this->symbol_names != NULL) | |
61 | delete this->symbol_names; | |
62 | if (this->versym != NULL) | |
63 | delete this->versym; | |
64 | if (this->verdef != NULL) | |
65 | delete this->verdef; | |
66 | if (this->verneed != NULL) | |
67 | delete this->verneed; | |
68 | } | |
69 | ||
d491d34e ILT |
70 | // Class Xindex. |
71 | ||
72 | // Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX | |
73 | // section and read it in. SYMTAB_SHNDX is the index of the symbol | |
74 | // table we care about. | |
75 | ||
76 | template<int size, bool big_endian> | |
77 | void | |
2ea97941 | 78 | Xindex::initialize_symtab_xindex(Object* object, unsigned int symtab_shndx) |
d491d34e ILT |
79 | { |
80 | if (!this->symtab_xindex_.empty()) | |
81 | return; | |
82 | ||
2ea97941 | 83 | gold_assert(symtab_shndx != 0); |
d491d34e ILT |
84 | |
85 | // Look through the sections in reverse order, on the theory that it | |
86 | // is more likely to be near the end than the beginning. | |
87 | unsigned int i = object->shnum(); | |
88 | while (i > 0) | |
89 | { | |
90 | --i; | |
91 | if (object->section_type(i) == elfcpp::SHT_SYMTAB_SHNDX | |
2ea97941 | 92 | && this->adjust_shndx(object->section_link(i)) == symtab_shndx) |
d491d34e ILT |
93 | { |
94 | this->read_symtab_xindex<size, big_endian>(object, i, NULL); | |
95 | return; | |
96 | } | |
97 | } | |
98 | ||
99 | object->error(_("missing SHT_SYMTAB_SHNDX section")); | |
100 | } | |
101 | ||
102 | // Read in the symtab_xindex_ array, given the section index of the | |
103 | // SHT_SYMTAB_SHNDX section. If PSHDRS is not NULL, it points at the | |
104 | // section headers. | |
105 | ||
106 | template<int size, bool big_endian> | |
107 | void | |
108 | Xindex::read_symtab_xindex(Object* object, unsigned int xindex_shndx, | |
109 | const unsigned char* pshdrs) | |
110 | { | |
111 | section_size_type bytecount; | |
112 | const unsigned char* contents; | |
113 | if (pshdrs == NULL) | |
114 | contents = object->section_contents(xindex_shndx, &bytecount, false); | |
115 | else | |
116 | { | |
117 | const unsigned char* p = (pshdrs | |
118 | + (xindex_shndx | |
119 | * elfcpp::Elf_sizes<size>::shdr_size)); | |
120 | typename elfcpp::Shdr<size, big_endian> shdr(p); | |
121 | bytecount = convert_to_section_size_type(shdr.get_sh_size()); | |
122 | contents = object->get_view(shdr.get_sh_offset(), bytecount, true, false); | |
123 | } | |
124 | ||
125 | gold_assert(this->symtab_xindex_.empty()); | |
126 | this->symtab_xindex_.reserve(bytecount / 4); | |
127 | for (section_size_type i = 0; i < bytecount; i += 4) | |
128 | { | |
129 | unsigned int shndx = elfcpp::Swap<32, big_endian>::readval(contents + i); | |
130 | // We preadjust the section indexes we save. | |
131 | this->symtab_xindex_.push_back(this->adjust_shndx(shndx)); | |
132 | } | |
133 | } | |
134 | ||
135 | // Symbol symndx has a section of SHN_XINDEX; return the real section | |
136 | // index. | |
137 | ||
138 | unsigned int | |
139 | Xindex::sym_xindex_to_shndx(Object* object, unsigned int symndx) | |
140 | { | |
141 | if (symndx >= this->symtab_xindex_.size()) | |
142 | { | |
143 | object->error(_("symbol %u out of range for SHT_SYMTAB_SHNDX section"), | |
144 | symndx); | |
145 | return elfcpp::SHN_UNDEF; | |
146 | } | |
147 | unsigned int shndx = this->symtab_xindex_[symndx]; | |
148 | if (shndx < elfcpp::SHN_LORESERVE || shndx >= object->shnum()) | |
149 | { | |
150 | object->error(_("extended index for symbol %u out of range: %u"), | |
151 | symndx, shndx); | |
152 | return elfcpp::SHN_UNDEF; | |
153 | } | |
154 | return shndx; | |
155 | } | |
156 | ||
645f8123 ILT |
157 | // Class Object. |
158 | ||
75f2446e ILT |
159 | // Report an error for this object file. This is used by the |
160 | // elfcpp::Elf_file interface, and also called by the Object code | |
161 | // itself. | |
645f8123 ILT |
162 | |
163 | void | |
75f2446e | 164 | Object::error(const char* format, ...) const |
645f8123 ILT |
165 | { |
166 | va_list args; | |
645f8123 | 167 | va_start(args, format); |
75f2446e ILT |
168 | char* buf = NULL; |
169 | if (vasprintf(&buf, format, args) < 0) | |
170 | gold_nomem(); | |
645f8123 | 171 | va_end(args); |
75f2446e ILT |
172 | gold_error(_("%s: %s"), this->name().c_str(), buf); |
173 | free(buf); | |
645f8123 ILT |
174 | } |
175 | ||
176 | // Return a view of the contents of a section. | |
177 | ||
178 | const unsigned char* | |
8383303e ILT |
179 | Object::section_contents(unsigned int shndx, section_size_type* plen, |
180 | bool cache) | |
645f8123 ILT |
181 | { |
182 | Location loc(this->do_section_contents(shndx)); | |
8383303e | 183 | *plen = convert_to_section_size_type(loc.data_size); |
8d63875c ILT |
184 | if (*plen == 0) |
185 | { | |
186 | static const unsigned char empty[1] = { '\0' }; | |
187 | return empty; | |
188 | } | |
39d0cb0e | 189 | return this->get_view(loc.file_offset, *plen, true, cache); |
645f8123 ILT |
190 | } |
191 | ||
dbe717ef ILT |
192 | // Read the section data into SD. This is code common to Sized_relobj |
193 | // and Sized_dynobj, so we put it into Object. | |
194 | ||
195 | template<int size, bool big_endian> | |
196 | void | |
197 | Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file, | |
198 | Read_symbols_data* sd) | |
199 | { | |
200 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
201 | ||
202 | // Read the section headers. | |
203 | const off_t shoff = elf_file->shoff(); | |
2ea97941 ILT |
204 | const unsigned int shnum = this->shnum(); |
205 | sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size, | |
39d0cb0e | 206 | true, true); |
dbe717ef ILT |
207 | |
208 | // Read the section names. | |
209 | const unsigned char* pshdrs = sd->section_headers->data(); | |
210 | const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size; | |
211 | typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames); | |
212 | ||
213 | if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB) | |
75f2446e ILT |
214 | this->error(_("section name section has wrong type: %u"), |
215 | static_cast<unsigned int>(shdrnames.get_sh_type())); | |
dbe717ef | 216 | |
8383303e ILT |
217 | sd->section_names_size = |
218 | convert_to_section_size_type(shdrnames.get_sh_size()); | |
dbe717ef | 219 | sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), |
39d0cb0e ILT |
220 | sd->section_names_size, false, |
221 | false); | |
dbe717ef ILT |
222 | } |
223 | ||
2ea97941 | 224 | // If NAME is the name of a special .gnu.warning section, arrange for |
dbe717ef ILT |
225 | // the warning to be issued. SHNDX is the section index. Return |
226 | // whether it is a warning section. | |
227 | ||
228 | bool | |
2ea97941 | 229 | Object::handle_gnu_warning_section(const char* name, unsigned int shndx, |
dbe717ef ILT |
230 | Symbol_table* symtab) |
231 | { | |
232 | const char warn_prefix[] = ".gnu.warning."; | |
233 | const int warn_prefix_len = sizeof warn_prefix - 1; | |
2ea97941 | 234 | if (strncmp(name, warn_prefix, warn_prefix_len) == 0) |
dbe717ef | 235 | { |
cb295612 ILT |
236 | // Read the section contents to get the warning text. It would |
237 | // be nicer if we only did this if we have to actually issue a | |
238 | // warning. Unfortunately, warnings are issued as we relocate | |
239 | // sections. That means that we can not lock the object then, | |
240 | // as we might try to issue the same warning multiple times | |
241 | // simultaneously. | |
242 | section_size_type len; | |
243 | const unsigned char* contents = this->section_contents(shndx, &len, | |
244 | false); | |
8d63875c ILT |
245 | if (len == 0) |
246 | { | |
2ea97941 | 247 | const char* warning = name + warn_prefix_len; |
8d63875c ILT |
248 | contents = reinterpret_cast<const unsigned char*>(warning); |
249 | len = strlen(warning); | |
250 | } | |
cb295612 | 251 | std::string warning(reinterpret_cast<const char*>(contents), len); |
2ea97941 | 252 | symtab->add_warning(name + warn_prefix_len, this, warning); |
dbe717ef ILT |
253 | return true; |
254 | } | |
255 | return false; | |
256 | } | |
257 | ||
2ea97941 | 258 | // If NAME is the name of the special section which indicates that |
364c7fa5 ILT |
259 | // this object was compiled with -fstack-split, mark it accordingly. |
260 | ||
261 | bool | |
2ea97941 | 262 | Object::handle_split_stack_section(const char* name) |
364c7fa5 | 263 | { |
2ea97941 | 264 | if (strcmp(name, ".note.GNU-split-stack") == 0) |
364c7fa5 ILT |
265 | { |
266 | this->uses_split_stack_ = true; | |
267 | return true; | |
268 | } | |
2ea97941 | 269 | if (strcmp(name, ".note.GNU-no-split-stack") == 0) |
364c7fa5 ILT |
270 | { |
271 | this->has_no_split_stack_ = true; | |
272 | return true; | |
273 | } | |
274 | return false; | |
275 | } | |
276 | ||
6d03d481 ST |
277 | // Class Relobj |
278 | ||
279 | // To copy the symbols data read from the file to a local data structure. | |
280 | // This function is called from do_layout only while doing garbage | |
281 | // collection. | |
282 | ||
283 | void | |
284 | Relobj::copy_symbols_data(Symbols_data* gc_sd, Read_symbols_data* sd, | |
285 | unsigned int section_header_size) | |
286 | { | |
287 | gc_sd->section_headers_data = | |
288 | new unsigned char[(section_header_size)]; | |
289 | memcpy(gc_sd->section_headers_data, sd->section_headers->data(), | |
290 | section_header_size); | |
291 | gc_sd->section_names_data = | |
292 | new unsigned char[sd->section_names_size]; | |
293 | memcpy(gc_sd->section_names_data, sd->section_names->data(), | |
294 | sd->section_names_size); | |
295 | gc_sd->section_names_size = sd->section_names_size; | |
296 | if (sd->symbols != NULL) | |
297 | { | |
298 | gc_sd->symbols_data = | |
299 | new unsigned char[sd->symbols_size]; | |
300 | memcpy(gc_sd->symbols_data, sd->symbols->data(), | |
301 | sd->symbols_size); | |
302 | } | |
303 | else | |
304 | { | |
305 | gc_sd->symbols_data = NULL; | |
306 | } | |
307 | gc_sd->symbols_size = sd->symbols_size; | |
308 | gc_sd->external_symbols_offset = sd->external_symbols_offset; | |
309 | if (sd->symbol_names != NULL) | |
310 | { | |
311 | gc_sd->symbol_names_data = | |
312 | new unsigned char[sd->symbol_names_size]; | |
313 | memcpy(gc_sd->symbol_names_data, sd->symbol_names->data(), | |
314 | sd->symbol_names_size); | |
315 | } | |
316 | else | |
317 | { | |
318 | gc_sd->symbol_names_data = NULL; | |
319 | } | |
320 | gc_sd->symbol_names_size = sd->symbol_names_size; | |
321 | } | |
322 | ||
323 | // This function determines if a particular section name must be included | |
324 | // in the link. This is used during garbage collection to determine the | |
325 | // roots of the worklist. | |
326 | ||
327 | bool | |
2ea97941 | 328 | Relobj::is_section_name_included(const char* name) |
6d03d481 | 329 | { |
2ea97941 ILT |
330 | if (is_prefix_of(".ctors", name) |
331 | || is_prefix_of(".dtors", name) | |
332 | || is_prefix_of(".note", name) | |
333 | || is_prefix_of(".init", name) | |
334 | || is_prefix_of(".fini", name) | |
335 | || is_prefix_of(".gcc_except_table", name) | |
336 | || is_prefix_of(".jcr", name) | |
337 | || is_prefix_of(".preinit_array", name) | |
338 | || (is_prefix_of(".text", name) | |
339 | && strstr(name, "personality")) | |
340 | || (is_prefix_of(".data", name) | |
341 | && strstr(name, "personality")) | |
fa618ee4 ILT |
342 | || (is_prefix_of(".gnu.linkonce.d", name) |
343 | && strstr(name, "personality"))) | |
6d03d481 ST |
344 | { |
345 | return true; | |
346 | } | |
347 | return false; | |
348 | } | |
349 | ||
09ec0418 CC |
350 | // Finalize the incremental relocation information. Allocates a block |
351 | // of relocation entries for each symbol, and sets the reloc_bases_ | |
352 | // array to point to the first entry in each block. Returns the next | |
353 | // available reloation index. | |
354 | ||
355 | void | |
356 | Relobj::finalize_incremental_relocs(Layout* layout) | |
357 | { | |
358 | unsigned int nsyms = this->get_global_symbols()->size(); | |
359 | this->reloc_bases_ = new unsigned int[nsyms]; | |
360 | ||
361 | gold_assert(this->reloc_bases_ != NULL); | |
362 | gold_assert(layout->incremental_inputs() != NULL); | |
363 | ||
364 | unsigned int rindex = layout->incremental_inputs()->get_reloc_count(); | |
365 | for (unsigned int i = 0; i < nsyms; ++i) | |
366 | { | |
367 | this->reloc_bases_[i] = rindex; | |
368 | rindex += this->reloc_counts_[i]; | |
369 | this->reloc_counts_[i] = 0; | |
370 | } | |
371 | layout->incremental_inputs()->set_reloc_count(rindex); | |
372 | } | |
373 | ||
f6ce93d6 | 374 | // Class Sized_relobj. |
bae7f79e ILT |
375 | |
376 | template<int size, bool big_endian> | |
f6ce93d6 | 377 | Sized_relobj<size, big_endian>::Sized_relobj( |
2ea97941 ILT |
378 | const std::string& name, |
379 | Input_file* input_file, | |
380 | off_t offset, | |
bae7f79e | 381 | const elfcpp::Ehdr<size, big_endian>& ehdr) |
2ea97941 | 382 | : Relobj(name, input_file, offset), |
645f8123 | 383 | elf_file_(this, ehdr), |
dbe717ef | 384 | symtab_shndx_(-1U), |
61ba1cf9 ILT |
385 | local_symbol_count_(0), |
386 | output_local_symbol_count_(0), | |
7bf1f802 | 387 | output_local_dynsym_count_(0), |
730cdc88 | 388 | symbols_(), |
92de84a6 | 389 | defined_count_(0), |
61ba1cf9 | 390 | local_symbol_offset_(0), |
7bf1f802 | 391 | local_dynsym_offset_(0), |
e727fa71 | 392 | local_values_(), |
730cdc88 | 393 | local_got_offsets_(), |
ef9beddf | 394 | kept_comdat_sections_(), |
805bb01c | 395 | has_eh_frame_(false), |
a2e47362 CC |
396 | discarded_eh_frame_shndx_(-1U), |
397 | deferred_layout_(), | |
398 | deferred_layout_relocs_(), | |
399 | compressed_sections_() | |
bae7f79e | 400 | { |
bae7f79e ILT |
401 | } |
402 | ||
403 | template<int size, bool big_endian> | |
f6ce93d6 | 404 | Sized_relobj<size, big_endian>::~Sized_relobj() |
bae7f79e ILT |
405 | { |
406 | } | |
407 | ||
645f8123 | 408 | // Set up an object file based on the file header. This sets up the |
029ba973 | 409 | // section information. |
bae7f79e ILT |
410 | |
411 | template<int size, bool big_endian> | |
412 | void | |
c0a62865 | 413 | Sized_relobj<size, big_endian>::do_setup() |
bae7f79e | 414 | { |
2ea97941 ILT |
415 | const unsigned int shnum = this->elf_file_.shnum(); |
416 | this->set_shnum(shnum); | |
dbe717ef | 417 | } |
12e14209 | 418 | |
dbe717ef ILT |
419 | // Find the SHT_SYMTAB section, given the section headers. The ELF |
420 | // standard says that maybe in the future there can be more than one | |
421 | // SHT_SYMTAB section. Until somebody figures out how that could | |
422 | // work, we assume there is only one. | |
12e14209 | 423 | |
dbe717ef ILT |
424 | template<int size, bool big_endian> |
425 | void | |
426 | Sized_relobj<size, big_endian>::find_symtab(const unsigned char* pshdrs) | |
427 | { | |
2ea97941 | 428 | const unsigned int shnum = this->shnum(); |
dbe717ef | 429 | this->symtab_shndx_ = 0; |
2ea97941 | 430 | if (shnum > 0) |
bae7f79e | 431 | { |
dbe717ef ILT |
432 | // Look through the sections in reverse order, since gas tends |
433 | // to put the symbol table at the end. | |
2ea97941 ILT |
434 | const unsigned char* p = pshdrs + shnum * This::shdr_size; |
435 | unsigned int i = shnum; | |
d491d34e ILT |
436 | unsigned int xindex_shndx = 0; |
437 | unsigned int xindex_link = 0; | |
dbe717ef | 438 | while (i > 0) |
bae7f79e | 439 | { |
dbe717ef ILT |
440 | --i; |
441 | p -= This::shdr_size; | |
442 | typename This::Shdr shdr(p); | |
443 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) | |
444 | { | |
445 | this->symtab_shndx_ = i; | |
d491d34e ILT |
446 | if (xindex_shndx > 0 && xindex_link == i) |
447 | { | |
448 | Xindex* xindex = | |
449 | new Xindex(this->elf_file_.large_shndx_offset()); | |
450 | xindex->read_symtab_xindex<size, big_endian>(this, | |
451 | xindex_shndx, | |
452 | pshdrs); | |
453 | this->set_xindex(xindex); | |
454 | } | |
dbe717ef ILT |
455 | break; |
456 | } | |
d491d34e ILT |
457 | |
458 | // Try to pick up the SHT_SYMTAB_SHNDX section, if there is | |
459 | // one. This will work if it follows the SHT_SYMTAB | |
460 | // section. | |
461 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB_SHNDX) | |
462 | { | |
463 | xindex_shndx = i; | |
464 | xindex_link = this->adjust_shndx(shdr.get_sh_link()); | |
465 | } | |
bae7f79e | 466 | } |
bae7f79e ILT |
467 | } |
468 | } | |
469 | ||
d491d34e ILT |
470 | // Return the Xindex structure to use for object with lots of |
471 | // sections. | |
472 | ||
473 | template<int size, bool big_endian> | |
474 | Xindex* | |
475 | Sized_relobj<size, big_endian>::do_initialize_xindex() | |
476 | { | |
477 | gold_assert(this->symtab_shndx_ != -1U); | |
478 | Xindex* xindex = new Xindex(this->elf_file_.large_shndx_offset()); | |
479 | xindex->initialize_symtab_xindex<size, big_endian>(this, this->symtab_shndx_); | |
480 | return xindex; | |
481 | } | |
482 | ||
730cdc88 ILT |
483 | // Return whether SHDR has the right type and flags to be a GNU |
484 | // .eh_frame section. | |
485 | ||
486 | template<int size, bool big_endian> | |
487 | bool | |
488 | Sized_relobj<size, big_endian>::check_eh_frame_flags( | |
489 | const elfcpp::Shdr<size, big_endian>* shdr) const | |
490 | { | |
2c38906f | 491 | return (shdr->get_sh_type() == elfcpp::SHT_PROGBITS |
1650c4ff | 492 | && (shdr->get_sh_flags() & elfcpp::SHF_ALLOC) != 0); |
730cdc88 ILT |
493 | } |
494 | ||
495 | // Return whether there is a GNU .eh_frame section, given the section | |
496 | // headers and the section names. | |
497 | ||
498 | template<int size, bool big_endian> | |
499 | bool | |
8383303e ILT |
500 | Sized_relobj<size, big_endian>::find_eh_frame( |
501 | const unsigned char* pshdrs, | |
502 | const char* names, | |
503 | section_size_type names_size) const | |
730cdc88 | 504 | { |
2ea97941 | 505 | const unsigned int shnum = this->shnum(); |
730cdc88 | 506 | const unsigned char* p = pshdrs + This::shdr_size; |
2ea97941 | 507 | for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size) |
730cdc88 ILT |
508 | { |
509 | typename This::Shdr shdr(p); | |
510 | if (this->check_eh_frame_flags(&shdr)) | |
511 | { | |
512 | if (shdr.get_sh_name() >= names_size) | |
513 | { | |
514 | this->error(_("bad section name offset for section %u: %lu"), | |
515 | i, static_cast<unsigned long>(shdr.get_sh_name())); | |
516 | continue; | |
517 | } | |
518 | ||
2ea97941 ILT |
519 | const char* name = names + shdr.get_sh_name(); |
520 | if (strcmp(name, ".eh_frame") == 0) | |
730cdc88 ILT |
521 | return true; |
522 | } | |
523 | } | |
524 | return false; | |
525 | } | |
526 | ||
a2e47362 CC |
527 | // Build a table for any compressed debug sections, mapping each section index |
528 | // to the uncompressed size. | |
529 | ||
530 | template<int size, bool big_endian> | |
531 | Compressed_section_map* | |
532 | build_compressed_section_map( | |
533 | const unsigned char* pshdrs, | |
534 | unsigned int shnum, | |
535 | const char* names, | |
536 | section_size_type names_size, | |
537 | Sized_relobj<size, big_endian>* obj) | |
538 | { | |
539 | Compressed_section_map* uncompressed_sizes = new Compressed_section_map(); | |
540 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
541 | const unsigned char* p = pshdrs + shdr_size; | |
542 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) | |
543 | { | |
544 | typename elfcpp::Shdr<size, big_endian> shdr(p); | |
545 | if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS | |
546 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
547 | { | |
548 | if (shdr.get_sh_name() >= names_size) | |
549 | { | |
550 | obj->error(_("bad section name offset for section %u: %lu"), | |
551 | i, static_cast<unsigned long>(shdr.get_sh_name())); | |
552 | continue; | |
553 | } | |
554 | ||
555 | const char* name = names + shdr.get_sh_name(); | |
556 | if (is_compressed_debug_section(name)) | |
557 | { | |
558 | section_size_type len; | |
559 | const unsigned char* contents = | |
560 | obj->section_contents(i, &len, false); | |
561 | uint64_t uncompressed_size = get_uncompressed_size(contents, len); | |
562 | if (uncompressed_size != -1ULL) | |
563 | (*uncompressed_sizes)[i] = | |
564 | convert_to_section_size_type(uncompressed_size); | |
565 | } | |
566 | } | |
567 | } | |
568 | return uncompressed_sizes; | |
569 | } | |
570 | ||
12e14209 | 571 | // Read the sections and symbols from an object file. |
bae7f79e ILT |
572 | |
573 | template<int size, bool big_endian> | |
12e14209 | 574 | void |
f6ce93d6 | 575 | Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
bae7f79e | 576 | { |
dbe717ef | 577 | this->read_section_data(&this->elf_file_, sd); |
12e14209 | 578 | |
dbe717ef ILT |
579 | const unsigned char* const pshdrs = sd->section_headers->data(); |
580 | ||
581 | this->find_symtab(pshdrs); | |
12e14209 | 582 | |
730cdc88 ILT |
583 | const unsigned char* namesu = sd->section_names->data(); |
584 | const char* names = reinterpret_cast<const char*>(namesu); | |
1650c4ff ILT |
585 | if (memmem(names, sd->section_names_size, ".eh_frame", 10) != NULL) |
586 | { | |
587 | if (this->find_eh_frame(pshdrs, names, sd->section_names_size)) | |
588 | this->has_eh_frame_ = true; | |
589 | } | |
a2e47362 CC |
590 | if (memmem(names, sd->section_names_size, ".zdebug_", 8) != NULL) |
591 | this->compressed_sections_ = | |
592 | build_compressed_section_map(pshdrs, this->shnum(), names, | |
593 | sd->section_names_size, this); | |
730cdc88 | 594 | |
75f2446e ILT |
595 | sd->symbols = NULL; |
596 | sd->symbols_size = 0; | |
730cdc88 | 597 | sd->external_symbols_offset = 0; |
75f2446e ILT |
598 | sd->symbol_names = NULL; |
599 | sd->symbol_names_size = 0; | |
600 | ||
645f8123 | 601 | if (this->symtab_shndx_ == 0) |
bae7f79e ILT |
602 | { |
603 | // No symbol table. Weird but legal. | |
12e14209 | 604 | return; |
bae7f79e ILT |
605 | } |
606 | ||
12e14209 ILT |
607 | // Get the symbol table section header. |
608 | typename This::Shdr symtabshdr(pshdrs | |
645f8123 | 609 | + this->symtab_shndx_ * This::shdr_size); |
a3ad94ed | 610 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
bae7f79e | 611 | |
730cdc88 ILT |
612 | // If this object has a .eh_frame section, we need all the symbols. |
613 | // Otherwise we only need the external symbols. While it would be | |
614 | // simpler to just always read all the symbols, I've seen object | |
615 | // files with well over 2000 local symbols, which for a 64-bit | |
616 | // object file format is over 5 pages that we don't need to read | |
617 | // now. | |
618 | ||
2ea97941 | 619 | const int sym_size = This::sym_size; |
92e059d8 ILT |
620 | const unsigned int loccount = symtabshdr.get_sh_info(); |
621 | this->local_symbol_count_ = loccount; | |
7bf1f802 | 622 | this->local_values_.resize(loccount); |
2ea97941 | 623 | section_offset_type locsize = loccount * sym_size; |
730cdc88 | 624 | off_t dataoff = symtabshdr.get_sh_offset(); |
8383303e ILT |
625 | section_size_type datasize = |
626 | convert_to_section_size_type(symtabshdr.get_sh_size()); | |
730cdc88 | 627 | off_t extoff = dataoff + locsize; |
8383303e | 628 | section_size_type extsize = datasize - locsize; |
75f65a3e | 629 | |
730cdc88 | 630 | off_t readoff = this->has_eh_frame_ ? dataoff : extoff; |
8383303e | 631 | section_size_type readsize = this->has_eh_frame_ ? datasize : extsize; |
730cdc88 | 632 | |
3f2e6a2d CC |
633 | if (readsize == 0) |
634 | { | |
635 | // No external symbols. Also weird but also legal. | |
636 | return; | |
637 | } | |
638 | ||
39d0cb0e | 639 | File_view* fvsymtab = this->get_lasting_view(readoff, readsize, true, false); |
bae7f79e ILT |
640 | |
641 | // Read the section header for the symbol names. | |
d491d34e | 642 | unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link()); |
dbe717ef | 643 | if (strtab_shndx >= this->shnum()) |
bae7f79e | 644 | { |
75f2446e ILT |
645 | this->error(_("invalid symbol table name index: %u"), strtab_shndx); |
646 | return; | |
bae7f79e | 647 | } |
dbe717ef | 648 | typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size); |
bae7f79e ILT |
649 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
650 | { | |
75f2446e ILT |
651 | this->error(_("symbol table name section has wrong type: %u"), |
652 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
653 | return; | |
bae7f79e ILT |
654 | } |
655 | ||
656 | // Read the symbol names. | |
657 | File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), | |
39d0cb0e ILT |
658 | strtabshdr.get_sh_size(), |
659 | false, true); | |
bae7f79e | 660 | |
12e14209 | 661 | sd->symbols = fvsymtab; |
730cdc88 ILT |
662 | sd->symbols_size = readsize; |
663 | sd->external_symbols_offset = this->has_eh_frame_ ? locsize : 0; | |
12e14209 | 664 | sd->symbol_names = fvstrtab; |
8383303e ILT |
665 | sd->symbol_names_size = |
666 | convert_to_section_size_type(strtabshdr.get_sh_size()); | |
a2fb1b05 ILT |
667 | } |
668 | ||
730cdc88 | 669 | // Return the section index of symbol SYM. Set *VALUE to its value in |
d491d34e ILT |
670 | // the object file. Set *IS_ORDINARY if this is an ordinary section |
671 | // index. not a special cod between SHN_LORESERVE and SHN_HIRESERVE. | |
672 | // Note that for a symbol which is not defined in this object file, | |
673 | // this will set *VALUE to 0 and return SHN_UNDEF; it will not return | |
674 | // the final value of the symbol in the link. | |
730cdc88 ILT |
675 | |
676 | template<int size, bool big_endian> | |
677 | unsigned int | |
678 | Sized_relobj<size, big_endian>::symbol_section_and_value(unsigned int sym, | |
d491d34e ILT |
679 | Address* value, |
680 | bool* is_ordinary) | |
730cdc88 | 681 | { |
8383303e | 682 | section_size_type symbols_size; |
730cdc88 ILT |
683 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, |
684 | &symbols_size, | |
685 | false); | |
686 | ||
687 | const size_t count = symbols_size / This::sym_size; | |
688 | gold_assert(sym < count); | |
689 | ||
690 | elfcpp::Sym<size, big_endian> elfsym(symbols + sym * This::sym_size); | |
691 | *value = elfsym.get_st_value(); | |
d491d34e ILT |
692 | |
693 | return this->adjust_sym_shndx(sym, elfsym.get_st_shndx(), is_ordinary); | |
730cdc88 ILT |
694 | } |
695 | ||
a2fb1b05 ILT |
696 | // Return whether to include a section group in the link. LAYOUT is |
697 | // used to keep track of which section groups we have already seen. | |
698 | // INDEX is the index of the section group and SHDR is the section | |
699 | // header. If we do not want to include this group, we set bits in | |
700 | // OMIT for each section which should be discarded. | |
701 | ||
702 | template<int size, bool big_endian> | |
703 | bool | |
f6ce93d6 | 704 | Sized_relobj<size, big_endian>::include_section_group( |
6a74a719 | 705 | Symbol_table* symtab, |
2ea97941 | 706 | Layout* layout, |
a2fb1b05 | 707 | unsigned int index, |
2ea97941 | 708 | const char* name, |
e94cf127 CC |
709 | const unsigned char* shdrs, |
710 | const char* section_names, | |
711 | section_size_type section_names_size, | |
a2fb1b05 ILT |
712 | std::vector<bool>* omit) |
713 | { | |
714 | // Read the section contents. | |
e94cf127 | 715 | typename This::Shdr shdr(shdrs + index * This::shdr_size); |
a2fb1b05 | 716 | const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), |
39d0cb0e | 717 | shdr.get_sh_size(), true, false); |
a2fb1b05 ILT |
718 | const elfcpp::Elf_Word* pword = |
719 | reinterpret_cast<const elfcpp::Elf_Word*>(pcon); | |
720 | ||
721 | // The first word contains flags. We only care about COMDAT section | |
722 | // groups. Other section groups are always included in the link | |
723 | // just like ordinary sections. | |
f6ce93d6 | 724 | elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword); |
a2fb1b05 ILT |
725 | |
726 | // Look up the group signature, which is the name of a symbol. This | |
727 | // is a lot of effort to go to to read a string. Why didn't they | |
6a74a719 ILT |
728 | // just have the group signature point into the string table, rather |
729 | // than indirect through a symbol? | |
a2fb1b05 ILT |
730 | |
731 | // Get the appropriate symbol table header (this will normally be | |
732 | // the single SHT_SYMTAB section, but in principle it need not be). | |
d491d34e | 733 | const unsigned int link = this->adjust_shndx(shdr.get_sh_link()); |
645f8123 | 734 | typename This::Shdr symshdr(this, this->elf_file_.section_header(link)); |
a2fb1b05 ILT |
735 | |
736 | // Read the symbol table entry. | |
d491d34e ILT |
737 | unsigned int symndx = shdr.get_sh_info(); |
738 | if (symndx >= symshdr.get_sh_size() / This::sym_size) | |
a2fb1b05 | 739 | { |
75f2446e | 740 | this->error(_("section group %u info %u out of range"), |
d491d34e | 741 | index, symndx); |
75f2446e | 742 | return false; |
a2fb1b05 | 743 | } |
d491d34e | 744 | off_t symoff = symshdr.get_sh_offset() + symndx * This::sym_size; |
39d0cb0e ILT |
745 | const unsigned char* psym = this->get_view(symoff, This::sym_size, true, |
746 | false); | |
a2fb1b05 ILT |
747 | elfcpp::Sym<size, big_endian> sym(psym); |
748 | ||
a2fb1b05 | 749 | // Read the symbol table names. |
8383303e | 750 | section_size_type symnamelen; |
645f8123 | 751 | const unsigned char* psymnamesu; |
d491d34e ILT |
752 | psymnamesu = this->section_contents(this->adjust_shndx(symshdr.get_sh_link()), |
753 | &symnamelen, true); | |
a2fb1b05 ILT |
754 | const char* psymnames = reinterpret_cast<const char*>(psymnamesu); |
755 | ||
756 | // Get the section group signature. | |
645f8123 | 757 | if (sym.get_st_name() >= symnamelen) |
a2fb1b05 | 758 | { |
75f2446e | 759 | this->error(_("symbol %u name offset %u out of range"), |
d491d34e | 760 | symndx, sym.get_st_name()); |
75f2446e | 761 | return false; |
a2fb1b05 ILT |
762 | } |
763 | ||
e94cf127 | 764 | std::string signature(psymnames + sym.get_st_name()); |
a2fb1b05 | 765 | |
ead1e424 ILT |
766 | // It seems that some versions of gas will create a section group |
767 | // associated with a section symbol, and then fail to give a name to | |
768 | // the section symbol. In such a case, use the name of the section. | |
645f8123 | 769 | if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION) |
ead1e424 | 770 | { |
d491d34e ILT |
771 | bool is_ordinary; |
772 | unsigned int sym_shndx = this->adjust_sym_shndx(symndx, | |
773 | sym.get_st_shndx(), | |
774 | &is_ordinary); | |
775 | if (!is_ordinary || sym_shndx >= this->shnum()) | |
776 | { | |
777 | this->error(_("symbol %u invalid section index %u"), | |
778 | symndx, sym_shndx); | |
779 | return false; | |
780 | } | |
e94cf127 CC |
781 | typename This::Shdr member_shdr(shdrs + sym_shndx * This::shdr_size); |
782 | if (member_shdr.get_sh_name() < section_names_size) | |
783 | signature = section_names + member_shdr.get_sh_name(); | |
ead1e424 ILT |
784 | } |
785 | ||
e94cf127 CC |
786 | // Record this section group in the layout, and see whether we've already |
787 | // seen one with the same signature. | |
8a4c0b0d | 788 | bool include_group; |
1ef4d87f ILT |
789 | bool is_comdat; |
790 | Kept_section* kept_section = NULL; | |
6a74a719 | 791 | |
8a4c0b0d | 792 | if ((flags & elfcpp::GRP_COMDAT) == 0) |
1ef4d87f ILT |
793 | { |
794 | include_group = true; | |
795 | is_comdat = false; | |
796 | } | |
8a4c0b0d | 797 | else |
e94cf127 | 798 | { |
2ea97941 ILT |
799 | include_group = layout->find_or_add_kept_section(signature, |
800 | this, index, true, | |
801 | true, &kept_section); | |
1ef4d87f | 802 | is_comdat = true; |
6a74a719 | 803 | } |
a2fb1b05 | 804 | |
a2fb1b05 | 805 | size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); |
8825ac63 ILT |
806 | |
807 | std::vector<unsigned int> shndxes; | |
808 | bool relocate_group = include_group && parameters->options().relocatable(); | |
809 | if (relocate_group) | |
810 | shndxes.reserve(count - 1); | |
811 | ||
a2fb1b05 ILT |
812 | for (size_t i = 1; i < count; ++i) |
813 | { | |
1ef4d87f | 814 | elfcpp::Elf_Word shndx = |
8825ac63 ILT |
815 | this->adjust_shndx(elfcpp::Swap<32, big_endian>::readval(pword + i)); |
816 | ||
817 | if (relocate_group) | |
1ef4d87f | 818 | shndxes.push_back(shndx); |
8825ac63 | 819 | |
1ef4d87f | 820 | if (shndx >= this->shnum()) |
a2fb1b05 | 821 | { |
75f2446e | 822 | this->error(_("section %u in section group %u out of range"), |
1ef4d87f | 823 | shndx, index); |
75f2446e | 824 | continue; |
a2fb1b05 | 825 | } |
55438702 ILT |
826 | |
827 | // Check for an earlier section number, since we're going to get | |
828 | // it wrong--we may have already decided to include the section. | |
1ef4d87f | 829 | if (shndx < index) |
55438702 | 830 | this->error(_("invalid section group %u refers to earlier section %u"), |
1ef4d87f | 831 | index, shndx); |
55438702 | 832 | |
e94cf127 | 833 | // Get the name of the member section. |
1ef4d87f | 834 | typename This::Shdr member_shdr(shdrs + shndx * This::shdr_size); |
e94cf127 CC |
835 | if (member_shdr.get_sh_name() >= section_names_size) |
836 | { | |
837 | // This is an error, but it will be diagnosed eventually | |
838 | // in do_layout, so we don't need to do anything here but | |
839 | // ignore it. | |
840 | continue; | |
841 | } | |
842 | std::string mname(section_names + member_shdr.get_sh_name()); | |
843 | ||
1ef4d87f ILT |
844 | if (include_group) |
845 | { | |
846 | if (is_comdat) | |
847 | kept_section->add_comdat_section(mname, shndx, | |
848 | member_shdr.get_sh_size()); | |
849 | } | |
850 | else | |
e94cf127 | 851 | { |
1ef4d87f ILT |
852 | (*omit)[shndx] = true; |
853 | ||
854 | if (is_comdat) | |
e94cf127 | 855 | { |
1ef4d87f ILT |
856 | Relobj* kept_object = kept_section->object(); |
857 | if (kept_section->is_comdat()) | |
858 | { | |
859 | // Find the corresponding kept section, and store | |
860 | // that info in the discarded section table. | |
861 | unsigned int kept_shndx; | |
862 | uint64_t kept_size; | |
863 | if (kept_section->find_comdat_section(mname, &kept_shndx, | |
864 | &kept_size)) | |
865 | { | |
866 | // We don't keep a mapping for this section if | |
867 | // it has a different size. The mapping is only | |
868 | // used for relocation processing, and we don't | |
869 | // want to treat the sections as similar if the | |
870 | // sizes are different. Checking the section | |
871 | // size is the approach used by the GNU linker. | |
872 | if (kept_size == member_shdr.get_sh_size()) | |
873 | this->set_kept_comdat_section(shndx, kept_object, | |
874 | kept_shndx); | |
875 | } | |
876 | } | |
877 | else | |
878 | { | |
879 | // The existing section is a linkonce section. Add | |
880 | // a mapping if there is exactly one section in the | |
881 | // group (which is true when COUNT == 2) and if it | |
882 | // is the same size. | |
883 | if (count == 2 | |
884 | && (kept_section->linkonce_size() | |
885 | == member_shdr.get_sh_size())) | |
886 | this->set_kept_comdat_section(shndx, kept_object, | |
887 | kept_section->shndx()); | |
888 | } | |
e94cf127 CC |
889 | } |
890 | } | |
a2fb1b05 ILT |
891 | } |
892 | ||
8825ac63 | 893 | if (relocate_group) |
2ea97941 ILT |
894 | layout->layout_group(symtab, this, index, name, signature.c_str(), |
895 | shdr, flags, &shndxes); | |
8825ac63 | 896 | |
e94cf127 | 897 | return include_group; |
a2fb1b05 ILT |
898 | } |
899 | ||
900 | // Whether to include a linkonce section in the link. NAME is the | |
901 | // name of the section and SHDR is the section header. | |
902 | ||
903 | // Linkonce sections are a GNU extension implemented in the original | |
904 | // GNU linker before section groups were defined. The semantics are | |
905 | // that we only include one linkonce section with a given name. The | |
906 | // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, | |
907 | // where T is the type of section and SYMNAME is the name of a symbol. | |
908 | // In an attempt to make linkonce sections interact well with section | |
909 | // groups, we try to identify SYMNAME and use it like a section group | |
910 | // signature. We want to block section groups with that signature, | |
911 | // but not other linkonce sections with that signature. We also use | |
912 | // the full name of the linkonce section as a normal section group | |
913 | // signature. | |
914 | ||
915 | template<int size, bool big_endian> | |
916 | bool | |
f6ce93d6 | 917 | Sized_relobj<size, big_endian>::include_linkonce_section( |
2ea97941 | 918 | Layout* layout, |
e94cf127 | 919 | unsigned int index, |
2ea97941 | 920 | const char* name, |
1ef4d87f | 921 | const elfcpp::Shdr<size, big_endian>& shdr) |
a2fb1b05 | 922 | { |
1ef4d87f | 923 | typename elfcpp::Elf_types<size>::Elf_WXword sh_size = shdr.get_sh_size(); |
ad435a24 ILT |
924 | // In general the symbol name we want will be the string following |
925 | // the last '.'. However, we have to handle the case of | |
926 | // .gnu.linkonce.t.__i686.get_pc_thunk.bx, which was generated by | |
927 | // some versions of gcc. So we use a heuristic: if the name starts | |
928 | // with ".gnu.linkonce.t.", we use everything after that. Otherwise | |
929 | // we look for the last '.'. We can't always simply skip | |
930 | // ".gnu.linkonce.X", because we have to deal with cases like | |
931 | // ".gnu.linkonce.d.rel.ro.local". | |
932 | const char* const linkonce_t = ".gnu.linkonce.t."; | |
933 | const char* symname; | |
2ea97941 ILT |
934 | if (strncmp(name, linkonce_t, strlen(linkonce_t)) == 0) |
935 | symname = name + strlen(linkonce_t); | |
ad435a24 | 936 | else |
2ea97941 | 937 | symname = strrchr(name, '.') + 1; |
e94cf127 | 938 | std::string sig1(symname); |
2ea97941 | 939 | std::string sig2(name); |
8a4c0b0d ILT |
940 | Kept_section* kept1; |
941 | Kept_section* kept2; | |
2ea97941 ILT |
942 | bool include1 = layout->find_or_add_kept_section(sig1, this, index, false, |
943 | false, &kept1); | |
944 | bool include2 = layout->find_or_add_kept_section(sig2, this, index, false, | |
945 | true, &kept2); | |
e94cf127 CC |
946 | |
947 | if (!include2) | |
948 | { | |
1ef4d87f ILT |
949 | // We are not including this section because we already saw the |
950 | // name of the section as a signature. This normally implies | |
951 | // that the kept section is another linkonce section. If it is | |
952 | // the same size, record it as the section which corresponds to | |
953 | // this one. | |
954 | if (kept2->object() != NULL | |
955 | && !kept2->is_comdat() | |
956 | && kept2->linkonce_size() == sh_size) | |
957 | this->set_kept_comdat_section(index, kept2->object(), kept2->shndx()); | |
e94cf127 CC |
958 | } |
959 | else if (!include1) | |
960 | { | |
961 | // The section is being discarded on the basis of its symbol | |
962 | // name. This means that the corresponding kept section was | |
963 | // part of a comdat group, and it will be difficult to identify | |
964 | // the specific section within that group that corresponds to | |
965 | // this linkonce section. We'll handle the simple case where | |
966 | // the group has only one member section. Otherwise, it's not | |
967 | // worth the effort. | |
1ef4d87f ILT |
968 | unsigned int kept_shndx; |
969 | uint64_t kept_size; | |
970 | if (kept1->object() != NULL | |
971 | && kept1->is_comdat() | |
972 | && kept1->find_single_comdat_section(&kept_shndx, &kept_size) | |
973 | && kept_size == sh_size) | |
974 | this->set_kept_comdat_section(index, kept1->object(), kept_shndx); | |
975 | } | |
976 | else | |
977 | { | |
978 | kept1->set_linkonce_size(sh_size); | |
979 | kept2->set_linkonce_size(sh_size); | |
e94cf127 CC |
980 | } |
981 | ||
a783673b | 982 | return include1 && include2; |
a2fb1b05 ILT |
983 | } |
984 | ||
5995b570 CC |
985 | // Layout an input section. |
986 | ||
987 | template<int size, bool big_endian> | |
988 | inline void | |
2ea97941 | 989 | Sized_relobj<size, big_endian>::layout_section(Layout* layout, |
5995b570 | 990 | unsigned int shndx, |
2ea97941 | 991 | const char* name, |
5995b570 CC |
992 | typename This::Shdr& shdr, |
993 | unsigned int reloc_shndx, | |
994 | unsigned int reloc_type) | |
995 | { | |
2ea97941 ILT |
996 | off_t offset; |
997 | Output_section* os = layout->layout(this, shndx, name, shdr, | |
998 | reloc_shndx, reloc_type, &offset); | |
5995b570 CC |
999 | |
1000 | this->output_sections()[shndx] = os; | |
2ea97941 | 1001 | if (offset == -1) |
5995b570 CC |
1002 | this->section_offsets_[shndx] = invalid_address; |
1003 | else | |
2ea97941 | 1004 | this->section_offsets_[shndx] = convert_types<Address, off_t>(offset); |
5995b570 CC |
1005 | |
1006 | // If this section requires special handling, and if there are | |
1007 | // relocs that apply to it, then we must do the special handling | |
1008 | // before we apply the relocs. | |
2ea97941 | 1009 | if (offset == -1 && reloc_shndx != 0) |
5995b570 CC |
1010 | this->set_relocs_must_follow_section_writes(); |
1011 | } | |
1012 | ||
a2fb1b05 ILT |
1013 | // Lay out the input sections. We walk through the sections and check |
1014 | // whether they should be included in the link. If they should, we | |
1015 | // pass them to the Layout object, which will return an output section | |
6d03d481 | 1016 | // and an offset. |
ef15dade ST |
1017 | // During garbage collection (--gc-sections) and identical code folding |
1018 | // (--icf), this function is called twice. When it is called the first | |
1019 | // time, it is for setting up some sections as roots to a work-list for | |
1020 | // --gc-sections and to do comdat processing. Actual layout happens the | |
1021 | // second time around after all the relevant sections have been determined. | |
1022 | // The first time, is_worklist_ready or is_icf_ready is false. It is then | |
1023 | // set to true after the garbage collection worklist or identical code | |
1024 | // folding is processed and the relevant sections to be kept are | |
1025 | // determined. Then, this function is called again to layout the sections. | |
a2fb1b05 ILT |
1026 | |
1027 | template<int size, bool big_endian> | |
1028 | void | |
7e1edb90 | 1029 | Sized_relobj<size, big_endian>::do_layout(Symbol_table* symtab, |
2ea97941 | 1030 | Layout* layout, |
12e14209 | 1031 | Read_symbols_data* sd) |
a2fb1b05 | 1032 | { |
2ea97941 | 1033 | const unsigned int shnum = this->shnum(); |
ef15dade ST |
1034 | bool is_gc_pass_one = ((parameters->options().gc_sections() |
1035 | && !symtab->gc()->is_worklist_ready()) | |
032ce4e9 | 1036 | || (parameters->options().icf_enabled() |
ef15dade ST |
1037 | && !symtab->icf()->is_icf_ready())); |
1038 | ||
1039 | bool is_gc_pass_two = ((parameters->options().gc_sections() | |
1040 | && symtab->gc()->is_worklist_ready()) | |
032ce4e9 | 1041 | || (parameters->options().icf_enabled() |
ef15dade ST |
1042 | && symtab->icf()->is_icf_ready())); |
1043 | ||
1044 | bool is_gc_or_icf = (parameters->options().gc_sections() | |
032ce4e9 | 1045 | || parameters->options().icf_enabled()); |
ef15dade ST |
1046 | |
1047 | // Both is_gc_pass_one and is_gc_pass_two should not be true. | |
1048 | gold_assert(!(is_gc_pass_one && is_gc_pass_two)); | |
1049 | ||
2ea97941 | 1050 | if (shnum == 0) |
12e14209 | 1051 | return; |
e0ebcf42 | 1052 | Symbols_data* gc_sd = NULL; |
6d03d481 ST |
1053 | if (is_gc_pass_one) |
1054 | { | |
1055 | // During garbage collection save the symbols data to use it when | |
1056 | // re-entering this function. | |
1057 | gc_sd = new Symbols_data; | |
2ea97941 | 1058 | this->copy_symbols_data(gc_sd, sd, This::shdr_size * shnum); |
6d03d481 ST |
1059 | this->set_symbols_data(gc_sd); |
1060 | } | |
1061 | else if (is_gc_pass_two) | |
1062 | { | |
1063 | gc_sd = this->get_symbols_data(); | |
1064 | } | |
1065 | ||
1066 | const unsigned char* section_headers_data = NULL; | |
1067 | section_size_type section_names_size; | |
1068 | const unsigned char* symbols_data = NULL; | |
1069 | section_size_type symbols_size; | |
1070 | section_offset_type external_symbols_offset; | |
1071 | const unsigned char* symbol_names_data = NULL; | |
1072 | section_size_type symbol_names_size; | |
1073 | ||
ef15dade | 1074 | if (is_gc_or_icf) |
6d03d481 ST |
1075 | { |
1076 | section_headers_data = gc_sd->section_headers_data; | |
1077 | section_names_size = gc_sd->section_names_size; | |
1078 | symbols_data = gc_sd->symbols_data; | |
1079 | symbols_size = gc_sd->symbols_size; | |
1080 | external_symbols_offset = gc_sd->external_symbols_offset; | |
1081 | symbol_names_data = gc_sd->symbol_names_data; | |
1082 | symbol_names_size = gc_sd->symbol_names_size; | |
1083 | } | |
1084 | else | |
1085 | { | |
1086 | section_headers_data = sd->section_headers->data(); | |
1087 | section_names_size = sd->section_names_size; | |
1088 | if (sd->symbols != NULL) | |
1089 | symbols_data = sd->symbols->data(); | |
1090 | symbols_size = sd->symbols_size; | |
1091 | external_symbols_offset = sd->external_symbols_offset; | |
1092 | if (sd->symbol_names != NULL) | |
1093 | symbol_names_data = sd->symbol_names->data(); | |
1094 | symbol_names_size = sd->symbol_names_size; | |
1095 | } | |
a2fb1b05 ILT |
1096 | |
1097 | // Get the section headers. | |
6d03d481 | 1098 | const unsigned char* shdrs = section_headers_data; |
e94cf127 | 1099 | const unsigned char* pshdrs; |
a2fb1b05 ILT |
1100 | |
1101 | // Get the section names. | |
ef15dade ST |
1102 | const unsigned char* pnamesu = (is_gc_or_icf) |
1103 | ? gc_sd->section_names_data | |
1104 | : sd->section_names->data(); | |
1105 | ||
a2fb1b05 ILT |
1106 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
1107 | ||
5995b570 CC |
1108 | // If any input files have been claimed by plugins, we need to defer |
1109 | // actual layout until the replacement files have arrived. | |
1110 | const bool should_defer_layout = | |
1111 | (parameters->options().has_plugins() | |
1112 | && parameters->options().plugins()->should_defer_layout()); | |
1113 | unsigned int num_sections_to_defer = 0; | |
1114 | ||
730cdc88 ILT |
1115 | // For each section, record the index of the reloc section if any. |
1116 | // Use 0 to mean that there is no reloc section, -1U to mean that | |
1117 | // there is more than one. | |
2ea97941 ILT |
1118 | std::vector<unsigned int> reloc_shndx(shnum, 0); |
1119 | std::vector<unsigned int> reloc_type(shnum, elfcpp::SHT_NULL); | |
730cdc88 | 1120 | // Skip the first, dummy, section. |
e94cf127 | 1121 | pshdrs = shdrs + This::shdr_size; |
2ea97941 | 1122 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
730cdc88 ILT |
1123 | { |
1124 | typename This::Shdr shdr(pshdrs); | |
1125 | ||
5995b570 CC |
1126 | // Count the number of sections whose layout will be deferred. |
1127 | if (should_defer_layout && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) | |
1128 | ++num_sections_to_defer; | |
1129 | ||
730cdc88 ILT |
1130 | unsigned int sh_type = shdr.get_sh_type(); |
1131 | if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA) | |
1132 | { | |
d491d34e | 1133 | unsigned int target_shndx = this->adjust_shndx(shdr.get_sh_info()); |
2ea97941 | 1134 | if (target_shndx == 0 || target_shndx >= shnum) |
730cdc88 ILT |
1135 | { |
1136 | this->error(_("relocation section %u has bad info %u"), | |
1137 | i, target_shndx); | |
1138 | continue; | |
1139 | } | |
1140 | ||
1141 | if (reloc_shndx[target_shndx] != 0) | |
1142 | reloc_shndx[target_shndx] = -1U; | |
1143 | else | |
1144 | { | |
1145 | reloc_shndx[target_shndx] = i; | |
1146 | reloc_type[target_shndx] = sh_type; | |
1147 | } | |
1148 | } | |
1149 | } | |
1150 | ||
ef9beddf ILT |
1151 | Output_sections& out_sections(this->output_sections()); |
1152 | std::vector<Address>& out_section_offsets(this->section_offsets_); | |
1153 | ||
6d03d481 ST |
1154 | if (!is_gc_pass_two) |
1155 | { | |
2ea97941 ILT |
1156 | out_sections.resize(shnum); |
1157 | out_section_offsets.resize(shnum); | |
6d03d481 | 1158 | } |
a2fb1b05 | 1159 | |
88dd47ac ILT |
1160 | // If we are only linking for symbols, then there is nothing else to |
1161 | // do here. | |
1162 | if (this->input_file()->just_symbols()) | |
1163 | { | |
6d03d481 ST |
1164 | if (!is_gc_pass_two) |
1165 | { | |
1166 | delete sd->section_headers; | |
1167 | sd->section_headers = NULL; | |
1168 | delete sd->section_names; | |
1169 | sd->section_names = NULL; | |
1170 | } | |
88dd47ac ILT |
1171 | return; |
1172 | } | |
1173 | ||
5995b570 CC |
1174 | if (num_sections_to_defer > 0) |
1175 | { | |
1176 | parameters->options().plugins()->add_deferred_layout_object(this); | |
1177 | this->deferred_layout_.reserve(num_sections_to_defer); | |
1178 | } | |
1179 | ||
35cdfc9a ILT |
1180 | // Whether we've seen a .note.GNU-stack section. |
1181 | bool seen_gnu_stack = false; | |
1182 | // The flags of a .note.GNU-stack section. | |
1183 | uint64_t gnu_stack_flags = 0; | |
1184 | ||
a2fb1b05 | 1185 | // Keep track of which sections to omit. |
2ea97941 | 1186 | std::vector<bool> omit(shnum, false); |
a2fb1b05 | 1187 | |
7019cd25 | 1188 | // Keep track of reloc sections when emitting relocations. |
8851ecca | 1189 | const bool relocatable = parameters->options().relocatable(); |
2ea97941 ILT |
1190 | const bool emit_relocs = (relocatable |
1191 | || parameters->options().emit_relocs()); | |
6a74a719 ILT |
1192 | std::vector<unsigned int> reloc_sections; |
1193 | ||
730cdc88 ILT |
1194 | // Keep track of .eh_frame sections. |
1195 | std::vector<unsigned int> eh_frame_sections; | |
1196 | ||
f6ce93d6 | 1197 | // Skip the first, dummy, section. |
e94cf127 | 1198 | pshdrs = shdrs + This::shdr_size; |
2ea97941 | 1199 | for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
a2fb1b05 | 1200 | { |
75f65a3e | 1201 | typename This::Shdr shdr(pshdrs); |
a2fb1b05 | 1202 | |
6d03d481 | 1203 | if (shdr.get_sh_name() >= section_names_size) |
a2fb1b05 | 1204 | { |
75f2446e ILT |
1205 | this->error(_("bad section name offset for section %u: %lu"), |
1206 | i, static_cast<unsigned long>(shdr.get_sh_name())); | |
1207 | return; | |
a2fb1b05 ILT |
1208 | } |
1209 | ||
2ea97941 | 1210 | const char* name = pnames + shdr.get_sh_name(); |
a2fb1b05 | 1211 | |
6d03d481 ST |
1212 | if (!is_gc_pass_two) |
1213 | { | |
2ea97941 | 1214 | if (this->handle_gnu_warning_section(name, i, symtab)) |
6d03d481 ST |
1215 | { |
1216 | if (!relocatable) | |
1217 | omit[i] = true; | |
1218 | } | |
f6ce93d6 | 1219 | |
6d03d481 ST |
1220 | // The .note.GNU-stack section is special. It gives the |
1221 | // protection flags that this object file requires for the stack | |
1222 | // in memory. | |
2ea97941 | 1223 | if (strcmp(name, ".note.GNU-stack") == 0) |
6d03d481 ST |
1224 | { |
1225 | seen_gnu_stack = true; | |
1226 | gnu_stack_flags |= shdr.get_sh_flags(); | |
1227 | omit[i] = true; | |
1228 | } | |
35cdfc9a | 1229 | |
364c7fa5 ILT |
1230 | // The .note.GNU-split-stack section is also special. It |
1231 | // indicates that the object was compiled with | |
1232 | // -fsplit-stack. | |
2ea97941 | 1233 | if (this->handle_split_stack_section(name)) |
364c7fa5 ILT |
1234 | { |
1235 | if (!parameters->options().relocatable() | |
1236 | && !parameters->options().shared()) | |
1237 | omit[i] = true; | |
1238 | } | |
1239 | ||
05a352e6 | 1240 | // Skip attributes section. |
2ea97941 | 1241 | if (parameters->target().is_attributes_section(name)) |
05a352e6 DK |
1242 | { |
1243 | omit[i] = true; | |
1244 | } | |
1245 | ||
6d03d481 ST |
1246 | bool discard = omit[i]; |
1247 | if (!discard) | |
1248 | { | |
1249 | if (shdr.get_sh_type() == elfcpp::SHT_GROUP) | |
1250 | { | |
2ea97941 | 1251 | if (!this->include_section_group(symtab, layout, i, name, |
6d03d481 ST |
1252 | shdrs, pnames, |
1253 | section_names_size, | |
1254 | &omit)) | |
1255 | discard = true; | |
1256 | } | |
1257 | else if ((shdr.get_sh_flags() & elfcpp::SHF_GROUP) == 0 | |
2ea97941 | 1258 | && Layout::is_linkonce(name)) |
6d03d481 | 1259 | { |
2ea97941 | 1260 | if (!this->include_linkonce_section(layout, i, name, shdr)) |
6d03d481 ST |
1261 | discard = true; |
1262 | } | |
a2fb1b05 | 1263 | } |
a2fb1b05 | 1264 | |
09ec0418 CC |
1265 | // Add the section to the incremental inputs layout. |
1266 | Incremental_inputs* incremental_inputs = layout->incremental_inputs(); | |
1267 | if (incremental_inputs != NULL) | |
1268 | incremental_inputs->report_input_section(this, i, | |
1269 | discard ? NULL : name, | |
1270 | shdr.get_sh_size()); | |
1271 | ||
6d03d481 ST |
1272 | if (discard) |
1273 | { | |
1274 | // Do not include this section in the link. | |
1275 | out_sections[i] = NULL; | |
1276 | out_section_offsets[i] = invalid_address; | |
1277 | continue; | |
1278 | } | |
1279 | } | |
1280 | ||
ef15dade | 1281 | if (is_gc_pass_one && parameters->options().gc_sections()) |
6d03d481 | 1282 | { |
2ea97941 | 1283 | if (is_section_name_included(name) |
6d03d481 ST |
1284 | || shdr.get_sh_type() == elfcpp::SHT_INIT_ARRAY |
1285 | || shdr.get_sh_type() == elfcpp::SHT_FINI_ARRAY) | |
1286 | { | |
1287 | symtab->gc()->worklist().push(Section_id(this, i)); | |
1288 | } | |
f1ec9ded ST |
1289 | // If the section name XXX can be represented as a C identifier |
1290 | // it cannot be discarded if there are references to | |
1291 | // __start_XXX and __stop_XXX symbols. These need to be | |
1292 | // specially handled. | |
1293 | if (is_cident(name)) | |
1294 | { | |
1295 | symtab->gc()->add_cident_section(name, Section_id(this, i)); | |
1296 | } | |
6d03d481 | 1297 | } |
a2fb1b05 | 1298 | |
6a74a719 ILT |
1299 | // When doing a relocatable link we are going to copy input |
1300 | // reloc sections into the output. We only want to copy the | |
1301 | // ones associated with sections which are not being discarded. | |
1302 | // However, we don't know that yet for all sections. So save | |
6d03d481 ST |
1303 | // reloc sections and process them later. Garbage collection is |
1304 | // not triggered when relocatable code is desired. | |
2ea97941 | 1305 | if (emit_relocs |
6a74a719 ILT |
1306 | && (shdr.get_sh_type() == elfcpp::SHT_REL |
1307 | || shdr.get_sh_type() == elfcpp::SHT_RELA)) | |
1308 | { | |
1309 | reloc_sections.push_back(i); | |
1310 | continue; | |
1311 | } | |
1312 | ||
8851ecca | 1313 | if (relocatable && shdr.get_sh_type() == elfcpp::SHT_GROUP) |
6a74a719 ILT |
1314 | continue; |
1315 | ||
730cdc88 ILT |
1316 | // The .eh_frame section is special. It holds exception frame |
1317 | // information that we need to read in order to generate the | |
1318 | // exception frame header. We process these after all the other | |
1319 | // sections so that the exception frame reader can reliably | |
1320 | // determine which sections are being discarded, and discard the | |
1321 | // corresponding information. | |
8851ecca | 1322 | if (!relocatable |
2ea97941 | 1323 | && strcmp(name, ".eh_frame") == 0 |
6d03d481 ST |
1324 | && this->check_eh_frame_flags(&shdr)) |
1325 | { | |
1326 | if (is_gc_pass_one) | |
1327 | { | |
1328 | out_sections[i] = reinterpret_cast<Output_section*>(1); | |
1329 | out_section_offsets[i] = invalid_address; | |
1330 | } | |
1331 | else | |
1332 | eh_frame_sections.push_back(i); | |
1333 | continue; | |
1334 | } | |
730cdc88 | 1335 | |
ef15dade | 1336 | if (is_gc_pass_two && parameters->options().gc_sections()) |
6d03d481 ST |
1337 | { |
1338 | // This is executed during the second pass of garbage | |
1339 | // collection. do_layout has been called before and some | |
1340 | // sections have been already discarded. Simply ignore | |
1341 | // such sections this time around. | |
1342 | if (out_sections[i] == NULL) | |
1343 | { | |
1344 | gold_assert(out_section_offsets[i] == invalid_address); | |
1345 | continue; | |
1346 | } | |
ef15dade ST |
1347 | if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) |
1348 | && symtab->gc()->is_section_garbage(this, i)) | |
6d03d481 ST |
1349 | { |
1350 | if (parameters->options().print_gc_sections()) | |
89dd1680 | 1351 | gold_info(_("%s: removing unused section from '%s'" |
ef15dade | 1352 | " in file '%s'"), |
6d03d481 ST |
1353 | program_name, this->section_name(i).c_str(), |
1354 | this->name().c_str()); | |
1355 | out_sections[i] = NULL; | |
1356 | out_section_offsets[i] = invalid_address; | |
1357 | continue; | |
1358 | } | |
1359 | } | |
ef15dade | 1360 | |
032ce4e9 | 1361 | if (is_gc_pass_two && parameters->options().icf_enabled()) |
ef15dade ST |
1362 | { |
1363 | if (out_sections[i] == NULL) | |
1364 | { | |
1365 | gold_assert(out_section_offsets[i] == invalid_address); | |
1366 | continue; | |
1367 | } | |
1368 | if (((shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) | |
1369 | && symtab->icf()->is_section_folded(this, i)) | |
1370 | { | |
1371 | if (parameters->options().print_icf_sections()) | |
1372 | { | |
1373 | Section_id folded = | |
1374 | symtab->icf()->get_folded_section(this, i); | |
1375 | Relobj* folded_obj = | |
1376 | reinterpret_cast<Relobj*>(folded.first); | |
1377 | gold_info(_("%s: ICF folding section '%s' in file '%s'" | |
1378 | "into '%s' in file '%s'"), | |
1379 | program_name, this->section_name(i).c_str(), | |
1380 | this->name().c_str(), | |
1381 | folded_obj->section_name(folded.second).c_str(), | |
1382 | folded_obj->name().c_str()); | |
1383 | } | |
1384 | out_sections[i] = NULL; | |
1385 | out_section_offsets[i] = invalid_address; | |
1386 | continue; | |
1387 | } | |
1388 | } | |
1389 | ||
6d03d481 ST |
1390 | // Defer layout here if input files are claimed by plugins. When gc |
1391 | // is turned on this function is called twice. For the second call | |
1392 | // should_defer_layout should be false. | |
5995b570 CC |
1393 | if (should_defer_layout && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) |
1394 | { | |
6d03d481 | 1395 | gold_assert(!is_gc_pass_two); |
2ea97941 | 1396 | this->deferred_layout_.push_back(Deferred_layout(i, name, |
6d03d481 | 1397 | pshdrs, |
5995b570 CC |
1398 | reloc_shndx[i], |
1399 | reloc_type[i])); | |
5995b570 CC |
1400 | // Put dummy values here; real values will be supplied by |
1401 | // do_layout_deferred_sections. | |
6d03d481 ST |
1402 | out_sections[i] = reinterpret_cast<Output_section*>(2); |
1403 | out_section_offsets[i] = invalid_address; | |
1404 | continue; | |
ef15dade ST |
1405 | } |
1406 | ||
6d03d481 ST |
1407 | // During gc_pass_two if a section that was previously deferred is |
1408 | // found, do not layout the section as layout_deferred_sections will | |
1409 | // do it later from gold.cc. | |
1410 | if (is_gc_pass_two | |
1411 | && (out_sections[i] == reinterpret_cast<Output_section*>(2))) | |
1412 | continue; | |
1413 | ||
1414 | if (is_gc_pass_one) | |
1415 | { | |
1416 | // This is during garbage collection. The out_sections are | |
1417 | // assigned in the second call to this function. | |
5995b570 CC |
1418 | out_sections[i] = reinterpret_cast<Output_section*>(1); |
1419 | out_section_offsets[i] = invalid_address; | |
1420 | } | |
ef9beddf | 1421 | else |
5995b570 | 1422 | { |
6d03d481 ST |
1423 | // When garbage collection is switched on the actual layout |
1424 | // only happens in the second call. | |
2ea97941 | 1425 | this->layout_section(layout, i, name, shdr, reloc_shndx[i], |
5995b570 CC |
1426 | reloc_type[i]); |
1427 | } | |
12e14209 ILT |
1428 | } |
1429 | ||
459e9b03 | 1430 | if (!is_gc_pass_two) |
2ea97941 | 1431 | layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags); |
35cdfc9a | 1432 | |
6a74a719 | 1433 | // When doing a relocatable link handle the reloc sections at the |
ef15dade ST |
1434 | // end. Garbage collection and Identical Code Folding is not |
1435 | // turned on for relocatable code. | |
2ea97941 | 1436 | if (emit_relocs) |
6a74a719 | 1437 | this->size_relocatable_relocs(); |
ef15dade ST |
1438 | |
1439 | gold_assert(!(is_gc_or_icf) || reloc_sections.empty()); | |
1440 | ||
6a74a719 ILT |
1441 | for (std::vector<unsigned int>::const_iterator p = reloc_sections.begin(); |
1442 | p != reloc_sections.end(); | |
1443 | ++p) | |
1444 | { | |
1445 | unsigned int i = *p; | |
1446 | const unsigned char* pshdr; | |
6d03d481 | 1447 | pshdr = section_headers_data + i * This::shdr_size; |
6a74a719 ILT |
1448 | typename This::Shdr shdr(pshdr); |
1449 | ||
d491d34e | 1450 | unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info()); |
2ea97941 | 1451 | if (data_shndx >= shnum) |
6a74a719 ILT |
1452 | { |
1453 | // We already warned about this above. | |
1454 | continue; | |
1455 | } | |
1456 | ||
ef9beddf | 1457 | Output_section* data_section = out_sections[data_shndx]; |
f3a2388f CC |
1458 | if (data_section == reinterpret_cast<Output_section*>(2)) |
1459 | { | |
1460 | // The layout for the data section was deferred, so we need | |
1461 | // to defer the relocation section, too. | |
1462 | const char* name = pnames + shdr.get_sh_name(); | |
1463 | this->deferred_layout_relocs_.push_back( | |
1464 | Deferred_layout(i, name, pshdr, 0, elfcpp::SHT_NULL)); | |
1465 | out_sections[i] = reinterpret_cast<Output_section*>(2); | |
1466 | out_section_offsets[i] = invalid_address; | |
1467 | continue; | |
1468 | } | |
6a74a719 ILT |
1469 | if (data_section == NULL) |
1470 | { | |
ef9beddf | 1471 | out_sections[i] = NULL; |
eff45813 | 1472 | out_section_offsets[i] = invalid_address; |
6a74a719 ILT |
1473 | continue; |
1474 | } | |
1475 | ||
1476 | Relocatable_relocs* rr = new Relocatable_relocs(); | |
1477 | this->set_relocatable_relocs(i, rr); | |
1478 | ||
2ea97941 ILT |
1479 | Output_section* os = layout->layout_reloc(this, i, shdr, data_section, |
1480 | rr); | |
ef9beddf | 1481 | out_sections[i] = os; |
eff45813 | 1482 | out_section_offsets[i] = invalid_address; |
6a74a719 ILT |
1483 | } |
1484 | ||
730cdc88 | 1485 | // Handle the .eh_frame sections at the end. |
6d03d481 | 1486 | gold_assert(!is_gc_pass_one || eh_frame_sections.empty()); |
730cdc88 ILT |
1487 | for (std::vector<unsigned int>::const_iterator p = eh_frame_sections.begin(); |
1488 | p != eh_frame_sections.end(); | |
1489 | ++p) | |
1490 | { | |
1491 | gold_assert(this->has_eh_frame_); | |
6d03d481 | 1492 | gold_assert(external_symbols_offset != 0); |
730cdc88 ILT |
1493 | |
1494 | unsigned int i = *p; | |
1495 | const unsigned char *pshdr; | |
6d03d481 | 1496 | pshdr = section_headers_data + i * This::shdr_size; |
730cdc88 ILT |
1497 | typename This::Shdr shdr(pshdr); |
1498 | ||
2ea97941 ILT |
1499 | off_t offset; |
1500 | Output_section* os = layout->layout_eh_frame(this, | |
1501 | symbols_data, | |
1502 | symbols_size, | |
1503 | symbol_names_data, | |
1504 | symbol_names_size, | |
1505 | i, shdr, | |
1506 | reloc_shndx[i], | |
1507 | reloc_type[i], | |
1508 | &offset); | |
ef9beddf | 1509 | out_sections[i] = os; |
339d40a3 | 1510 | if (os == NULL || offset == -1) |
805bb01c DK |
1511 | { |
1512 | // An object can contain at most one section holding exception | |
1513 | // frame information. | |
1514 | gold_assert(this->discarded_eh_frame_shndx_ == -1U); | |
1515 | this->discarded_eh_frame_shndx_ = i; | |
1516 | out_section_offsets[i] = invalid_address; | |
1517 | } | |
ef9beddf | 1518 | else |
2ea97941 | 1519 | out_section_offsets[i] = convert_types<Address, off_t>(offset); |
730cdc88 ILT |
1520 | |
1521 | // If this section requires special handling, and if there are | |
1522 | // relocs that apply to it, then we must do the special handling | |
1523 | // before we apply the relocs. | |
339d40a3 | 1524 | if (os != NULL && offset == -1 && reloc_shndx[i] != 0) |
730cdc88 ILT |
1525 | this->set_relocs_must_follow_section_writes(); |
1526 | } | |
1527 | ||
6d03d481 ST |
1528 | if (is_gc_pass_two) |
1529 | { | |
1530 | delete[] gc_sd->section_headers_data; | |
1531 | delete[] gc_sd->section_names_data; | |
1532 | delete[] gc_sd->symbols_data; | |
1533 | delete[] gc_sd->symbol_names_data; | |
ef15dade | 1534 | this->set_symbols_data(NULL); |
6d03d481 ST |
1535 | } |
1536 | else | |
1537 | { | |
1538 | delete sd->section_headers; | |
1539 | sd->section_headers = NULL; | |
1540 | delete sd->section_names; | |
1541 | sd->section_names = NULL; | |
1542 | } | |
12e14209 ILT |
1543 | } |
1544 | ||
5995b570 CC |
1545 | // Layout sections whose layout was deferred while waiting for |
1546 | // input files from a plugin. | |
1547 | ||
1548 | template<int size, bool big_endian> | |
1549 | void | |
2ea97941 | 1550 | Sized_relobj<size, big_endian>::do_layout_deferred_sections(Layout* layout) |
5995b570 CC |
1551 | { |
1552 | typename std::vector<Deferred_layout>::iterator deferred; | |
1553 | ||
1554 | for (deferred = this->deferred_layout_.begin(); | |
1555 | deferred != this->deferred_layout_.end(); | |
1556 | ++deferred) | |
1557 | { | |
1558 | typename This::Shdr shdr(deferred->shdr_data_); | |
5e0f337e RÁE |
1559 | // If the section is not included, it is because the garbage collector |
1560 | // decided it is not needed. Avoid reverting that decision. | |
1561 | if (!this->is_section_included(deferred->shndx_)) | |
1562 | continue; | |
1563 | ||
2ea97941 | 1564 | this->layout_section(layout, deferred->shndx_, deferred->name_.c_str(), |
5995b570 CC |
1565 | shdr, deferred->reloc_shndx_, deferred->reloc_type_); |
1566 | } | |
1567 | ||
1568 | this->deferred_layout_.clear(); | |
f3a2388f CC |
1569 | |
1570 | // Now handle the deferred relocation sections. | |
1571 | ||
1572 | Output_sections& out_sections(this->output_sections()); | |
1573 | std::vector<Address>& out_section_offsets(this->section_offsets_); | |
1574 | ||
1575 | for (deferred = this->deferred_layout_relocs_.begin(); | |
1576 | deferred != this->deferred_layout_relocs_.end(); | |
1577 | ++deferred) | |
1578 | { | |
1579 | unsigned int shndx = deferred->shndx_; | |
1580 | typename This::Shdr shdr(deferred->shdr_data_); | |
1581 | unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info()); | |
1582 | ||
1583 | Output_section* data_section = out_sections[data_shndx]; | |
1584 | if (data_section == NULL) | |
1585 | { | |
1586 | out_sections[shndx] = NULL; | |
1587 | out_section_offsets[shndx] = invalid_address; | |
1588 | continue; | |
1589 | } | |
1590 | ||
1591 | Relocatable_relocs* rr = new Relocatable_relocs(); | |
1592 | this->set_relocatable_relocs(shndx, rr); | |
1593 | ||
1594 | Output_section* os = layout->layout_reloc(this, shndx, shdr, | |
1595 | data_section, rr); | |
1596 | out_sections[shndx] = os; | |
1597 | out_section_offsets[shndx] = invalid_address; | |
1598 | } | |
5995b570 CC |
1599 | } |
1600 | ||
12e14209 ILT |
1601 | // Add the symbols to the symbol table. |
1602 | ||
1603 | template<int size, bool big_endian> | |
1604 | void | |
f6ce93d6 | 1605 | Sized_relobj<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
f488e4b0 CC |
1606 | Read_symbols_data* sd, |
1607 | Layout*) | |
12e14209 ILT |
1608 | { |
1609 | if (sd->symbols == NULL) | |
1610 | { | |
a3ad94ed | 1611 | gold_assert(sd->symbol_names == NULL); |
12e14209 ILT |
1612 | return; |
1613 | } | |
a2fb1b05 | 1614 | |
2ea97941 | 1615 | const int sym_size = This::sym_size; |
730cdc88 | 1616 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) |
2ea97941 ILT |
1617 | / sym_size); |
1618 | if (symcount * sym_size != sd->symbols_size - sd->external_symbols_offset) | |
12e14209 | 1619 | { |
75f2446e ILT |
1620 | this->error(_("size of symbols is not multiple of symbol size")); |
1621 | return; | |
a2fb1b05 | 1622 | } |
12e14209 | 1623 | |
730cdc88 | 1624 | this->symbols_.resize(symcount); |
12e14209 | 1625 | |
12e14209 ILT |
1626 | const char* sym_names = |
1627 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
730cdc88 ILT |
1628 | symtab->add_from_relobj(this, |
1629 | sd->symbols->data() + sd->external_symbols_offset, | |
7fcd3aa9 | 1630 | symcount, this->local_symbol_count_, |
d491d34e | 1631 | sym_names, sd->symbol_names_size, |
92de84a6 ILT |
1632 | &this->symbols_, |
1633 | &this->defined_count_); | |
12e14209 ILT |
1634 | |
1635 | delete sd->symbols; | |
1636 | sd->symbols = NULL; | |
1637 | delete sd->symbol_names; | |
1638 | sd->symbol_names = NULL; | |
bae7f79e ILT |
1639 | } |
1640 | ||
b0193076 RÁE |
1641 | // Find out if this object, that is a member of a lib group, should be included |
1642 | // in the link. We check every symbol defined by this object. If the symbol | |
1643 | // table has a strong undefined reference to that symbol, we have to include | |
1644 | // the object. | |
1645 | ||
1646 | template<int size, bool big_endian> | |
1647 | Archive::Should_include | |
1648 | Sized_relobj<size, big_endian>::do_should_include_member(Symbol_table* symtab, | |
88a4108b | 1649 | Layout* layout, |
b0193076 RÁE |
1650 | Read_symbols_data* sd, |
1651 | std::string* why) | |
1652 | { | |
1653 | char* tmpbuf = NULL; | |
1654 | size_t tmpbuflen = 0; | |
1655 | const char* sym_names = | |
1656 | reinterpret_cast<const char*>(sd->symbol_names->data()); | |
1657 | const unsigned char* syms = | |
1658 | sd->symbols->data() + sd->external_symbols_offset; | |
1659 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
1660 | size_t symcount = ((sd->symbols_size - sd->external_symbols_offset) | |
1661 | / sym_size); | |
1662 | ||
1663 | const unsigned char* p = syms; | |
1664 | ||
1665 | for (size_t i = 0; i < symcount; ++i, p += sym_size) | |
1666 | { | |
1667 | elfcpp::Sym<size, big_endian> sym(p); | |
1668 | unsigned int st_shndx = sym.get_st_shndx(); | |
1669 | if (st_shndx == elfcpp::SHN_UNDEF) | |
1670 | continue; | |
1671 | ||
1672 | unsigned int st_name = sym.get_st_name(); | |
1673 | const char* name = sym_names + st_name; | |
1674 | Symbol* symbol; | |
88a4108b ILT |
1675 | Archive::Should_include t = Archive::should_include_member(symtab, |
1676 | layout, | |
1677 | name, | |
b0193076 RÁE |
1678 | &symbol, why, |
1679 | &tmpbuf, | |
1680 | &tmpbuflen); | |
1681 | if (t == Archive::SHOULD_INCLUDE_YES) | |
1682 | { | |
1683 | if (tmpbuf != NULL) | |
1684 | free(tmpbuf); | |
1685 | return t; | |
1686 | } | |
1687 | } | |
1688 | if (tmpbuf != NULL) | |
1689 | free(tmpbuf); | |
1690 | return Archive::SHOULD_INCLUDE_UNKNOWN; | |
1691 | } | |
1692 | ||
cb295612 ILT |
1693 | // First pass over the local symbols. Here we add their names to |
1694 | // *POOL and *DYNPOOL, and we store the symbol value in | |
1695 | // THIS->LOCAL_VALUES_. This function is always called from a | |
1696 | // singleton thread. This is followed by a call to | |
1697 | // finalize_local_symbols. | |
75f65a3e ILT |
1698 | |
1699 | template<int size, bool big_endian> | |
7bf1f802 ILT |
1700 | void |
1701 | Sized_relobj<size, big_endian>::do_count_local_symbols(Stringpool* pool, | |
1702 | Stringpool* dynpool) | |
75f65a3e | 1703 | { |
a3ad94ed | 1704 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 1705 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
1706 | { |
1707 | // This object has no symbols. Weird but legal. | |
7bf1f802 | 1708 | return; |
61ba1cf9 ILT |
1709 | } |
1710 | ||
75f65a3e | 1711 | // Read the symbol table section header. |
2ea97941 | 1712 | const unsigned int symtab_shndx = this->symtab_shndx_; |
645f8123 | 1713 | typename This::Shdr symtabshdr(this, |
2ea97941 | 1714 | this->elf_file_.section_header(symtab_shndx)); |
a3ad94ed | 1715 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
75f65a3e ILT |
1716 | |
1717 | // Read the local symbols. | |
2ea97941 | 1718 | const int sym_size = This::sym_size; |
92e059d8 | 1719 | const unsigned int loccount = this->local_symbol_count_; |
a3ad94ed | 1720 | gold_assert(loccount == symtabshdr.get_sh_info()); |
2ea97941 | 1721 | off_t locsize = loccount * sym_size; |
75f65a3e | 1722 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
39d0cb0e | 1723 | locsize, true, true); |
75f65a3e | 1724 | |
75f65a3e | 1725 | // Read the symbol names. |
d491d34e ILT |
1726 | const unsigned int strtab_shndx = |
1727 | this->adjust_shndx(symtabshdr.get_sh_link()); | |
8383303e | 1728 | section_size_type strtab_size; |
645f8123 | 1729 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
9eb9fa57 ILT |
1730 | &strtab_size, |
1731 | true); | |
75f65a3e ILT |
1732 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
1733 | ||
1734 | // Loop over the local symbols. | |
1735 | ||
ef9beddf | 1736 | const Output_sections& out_sections(this->output_sections()); |
2ea97941 | 1737 | unsigned int shnum = this->shnum(); |
61ba1cf9 | 1738 | unsigned int count = 0; |
7bf1f802 | 1739 | unsigned int dyncount = 0; |
75f65a3e | 1740 | // Skip the first, dummy, symbol. |
2ea97941 | 1741 | psyms += sym_size; |
ebcc8304 | 1742 | bool discard_all = parameters->options().discard_all(); |
bb04269c | 1743 | bool discard_locals = parameters->options().discard_locals(); |
2ea97941 | 1744 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
75f65a3e ILT |
1745 | { |
1746 | elfcpp::Sym<size, big_endian> sym(psyms); | |
1747 | ||
b8e6aad9 ILT |
1748 | Symbol_value<size>& lv(this->local_values_[i]); |
1749 | ||
d491d34e ILT |
1750 | bool is_ordinary; |
1751 | unsigned int shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(), | |
1752 | &is_ordinary); | |
1753 | lv.set_input_shndx(shndx, is_ordinary); | |
75f65a3e | 1754 | |
063f12a8 ILT |
1755 | if (sym.get_st_type() == elfcpp::STT_SECTION) |
1756 | lv.set_is_section_symbol(); | |
7bf1f802 ILT |
1757 | else if (sym.get_st_type() == elfcpp::STT_TLS) |
1758 | lv.set_is_tls_symbol(); | |
1759 | ||
1760 | // Save the input symbol value for use in do_finalize_local_symbols(). | |
1761 | lv.set_input_value(sym.get_st_value()); | |
1762 | ||
1763 | // Decide whether this symbol should go into the output file. | |
063f12a8 | 1764 | |
2ea97941 | 1765 | if ((shndx < shnum && out_sections[shndx] == NULL) |
ebcc8304 | 1766 | || shndx == this->discarded_eh_frame_shndx_) |
7bf1f802 ILT |
1767 | { |
1768 | lv.set_no_output_symtab_entry(); | |
dceae3c1 | 1769 | gold_assert(!lv.needs_output_dynsym_entry()); |
7bf1f802 ILT |
1770 | continue; |
1771 | } | |
1772 | ||
1773 | if (sym.get_st_type() == elfcpp::STT_SECTION) | |
1774 | { | |
1775 | lv.set_no_output_symtab_entry(); | |
dceae3c1 | 1776 | gold_assert(!lv.needs_output_dynsym_entry()); |
7bf1f802 ILT |
1777 | continue; |
1778 | } | |
1779 | ||
1780 | if (sym.get_st_name() >= strtab_size) | |
1781 | { | |
1782 | this->error(_("local symbol %u section name out of range: %u >= %u"), | |
1783 | i, sym.get_st_name(), | |
1784 | static_cast<unsigned int>(strtab_size)); | |
1785 | lv.set_no_output_symtab_entry(); | |
1786 | continue; | |
1787 | } | |
1788 | ||
ebcc8304 ILT |
1789 | const char* name = pnames + sym.get_st_name(); |
1790 | ||
1791 | // If needed, add the symbol to the dynamic symbol table string pool. | |
1792 | if (lv.needs_output_dynsym_entry()) | |
1793 | { | |
1794 | dynpool->add(name, true, NULL); | |
1795 | ++dyncount; | |
1796 | } | |
1797 | ||
d3bbad62 | 1798 | if (discard_all && lv.may_be_discarded_from_output_symtab()) |
ebcc8304 ILT |
1799 | { |
1800 | lv.set_no_output_symtab_entry(); | |
1801 | continue; | |
1802 | } | |
1803 | ||
bb04269c DK |
1804 | // If --discard-locals option is used, discard all temporary local |
1805 | // symbols. These symbols start with system-specific local label | |
1806 | // prefixes, typically .L for ELF system. We want to be compatible | |
1807 | // with GNU ld so here we essentially use the same check in | |
1808 | // bfd_is_local_label(). The code is different because we already | |
1809 | // know that: | |
1810 | // | |
1811 | // - the symbol is local and thus cannot have global or weak binding. | |
1812 | // - the symbol is not a section symbol. | |
1813 | // - the symbol has a name. | |
1814 | // | |
1815 | // We do not discard a symbol if it needs a dynamic symbol entry. | |
bb04269c DK |
1816 | if (discard_locals |
1817 | && sym.get_st_type() != elfcpp::STT_FILE | |
1818 | && !lv.needs_output_dynsym_entry() | |
d3bbad62 | 1819 | && lv.may_be_discarded_from_output_symtab() |
2ea97941 | 1820 | && parameters->target().is_local_label_name(name)) |
bb04269c DK |
1821 | { |
1822 | lv.set_no_output_symtab_entry(); | |
1823 | continue; | |
1824 | } | |
1825 | ||
8c604651 CS |
1826 | // Discard the local symbol if -retain_symbols_file is specified |
1827 | // and the local symbol is not in that file. | |
2ea97941 | 1828 | if (!parameters->options().should_retain_symbol(name)) |
8c604651 CS |
1829 | { |
1830 | lv.set_no_output_symtab_entry(); | |
1831 | continue; | |
1832 | } | |
1833 | ||
bb04269c | 1834 | // Add the symbol to the symbol table string pool. |
2ea97941 | 1835 | pool->add(name, true, NULL); |
7bf1f802 | 1836 | ++count; |
7bf1f802 ILT |
1837 | } |
1838 | ||
1839 | this->output_local_symbol_count_ = count; | |
1840 | this->output_local_dynsym_count_ = dyncount; | |
1841 | } | |
1842 | ||
cb295612 | 1843 | // Finalize the local symbols. Here we set the final value in |
7bf1f802 | 1844 | // THIS->LOCAL_VALUES_ and set their output symbol table indexes. |
17a1d0a9 | 1845 | // This function is always called from a singleton thread. The actual |
7bf1f802 ILT |
1846 | // output of the local symbols will occur in a separate task. |
1847 | ||
1848 | template<int size, bool big_endian> | |
1849 | unsigned int | |
1850 | Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index, | |
ef15dade ST |
1851 | off_t off, |
1852 | Symbol_table* symtab) | |
7bf1f802 ILT |
1853 | { |
1854 | gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); | |
1855 | ||
1856 | const unsigned int loccount = this->local_symbol_count_; | |
1857 | this->local_symbol_offset_ = off; | |
1858 | ||
b4ecf66b | 1859 | const bool relocatable = parameters->options().relocatable(); |
ef9beddf ILT |
1860 | const Output_sections& out_sections(this->output_sections()); |
1861 | const std::vector<Address>& out_offsets(this->section_offsets_); | |
2ea97941 | 1862 | unsigned int shnum = this->shnum(); |
7bf1f802 ILT |
1863 | |
1864 | for (unsigned int i = 1; i < loccount; ++i) | |
1865 | { | |
1866 | Symbol_value<size>& lv(this->local_values_[i]); | |
1867 | ||
d491d34e ILT |
1868 | bool is_ordinary; |
1869 | unsigned int shndx = lv.input_shndx(&is_ordinary); | |
7bf1f802 ILT |
1870 | |
1871 | // Set the output symbol value. | |
ef9beddf | 1872 | |
d491d34e | 1873 | if (!is_ordinary) |
75f65a3e | 1874 | { |
8a5e3e08 | 1875 | if (shndx == elfcpp::SHN_ABS || Symbol::is_common_shndx(shndx)) |
7bf1f802 | 1876 | lv.set_output_value(lv.input_value()); |
61ba1cf9 | 1877 | else |
75f65a3e | 1878 | { |
75f2446e ILT |
1879 | this->error(_("unknown section index %u for local symbol %u"), |
1880 | shndx, i); | |
1881 | lv.set_output_value(0); | |
75f65a3e | 1882 | } |
75f65a3e ILT |
1883 | } |
1884 | else | |
1885 | { | |
2ea97941 | 1886 | if (shndx >= shnum) |
75f65a3e | 1887 | { |
75f2446e ILT |
1888 | this->error(_("local symbol %u section index %u out of range"), |
1889 | i, shndx); | |
1890 | shndx = 0; | |
75f65a3e ILT |
1891 | } |
1892 | ||
ef9beddf | 1893 | Output_section* os = out_sections[shndx]; |
ef15dade ST |
1894 | Address secoffset = out_offsets[shndx]; |
1895 | if (symtab->is_section_folded(this, shndx)) | |
1896 | { | |
1897 | gold_assert (os == NULL && secoffset == invalid_address); | |
1898 | // Get the os of the section it is folded onto. | |
1899 | Section_id folded = symtab->icf()->get_folded_section(this, | |
1900 | shndx); | |
1901 | gold_assert(folded.first != NULL); | |
1902 | Sized_relobj<size, big_endian>* folded_obj = reinterpret_cast | |
1903 | <Sized_relobj<size, big_endian>*>(folded.first); | |
1904 | os = folded_obj->output_section(folded.second); | |
1905 | gold_assert(os != NULL); | |
1906 | secoffset = folded_obj->get_output_section_offset(folded.second); | |
d6344fb5 DK |
1907 | |
1908 | // This could be a relaxed input section. | |
1909 | if (secoffset == invalid_address) | |
1910 | { | |
1911 | const Output_relaxed_input_section* relaxed_section = | |
1912 | os->find_relaxed_input_section(folded_obj, folded.second); | |
1913 | gold_assert(relaxed_section != NULL); | |
1914 | secoffset = relaxed_section->address() - os->address(); | |
1915 | } | |
ef15dade | 1916 | } |
b8e6aad9 ILT |
1917 | |
1918 | if (os == NULL) | |
61ba1cf9 | 1919 | { |
e94cf127 CC |
1920 | // This local symbol belongs to a section we are discarding. |
1921 | // In some cases when applying relocations later, we will | |
1922 | // attempt to match it to the corresponding kept section, | |
1923 | // so we leave the input value unchanged here. | |
61ba1cf9 ILT |
1924 | continue; |
1925 | } | |
ef15dade | 1926 | else if (secoffset == invalid_address) |
7bf1f802 | 1927 | { |
e29e076a ILT |
1928 | uint64_t start; |
1929 | ||
a9a60db6 | 1930 | // This is a SHF_MERGE section or one which otherwise |
e29e076a | 1931 | // requires special handling. |
805bb01c DK |
1932 | if (shndx == this->discarded_eh_frame_shndx_) |
1933 | { | |
1934 | // This local symbol belongs to a discarded .eh_frame | |
1935 | // section. Just treat it like the case in which | |
1936 | // os == NULL above. | |
1937 | gold_assert(this->has_eh_frame_); | |
1938 | continue; | |
1939 | } | |
1940 | else if (!lv.is_section_symbol()) | |
e29e076a ILT |
1941 | { |
1942 | // This is not a section symbol. We can determine | |
1943 | // the final value now. | |
1944 | lv.set_output_value(os->output_address(this, shndx, | |
1945 | lv.input_value())); | |
1946 | } | |
1947 | else if (!os->find_starting_output_address(this, shndx, &start)) | |
1948 | { | |
6c172549 DK |
1949 | // This is a section symbol, but apparently not one in a |
1950 | // merged section. First check to see if this is a relaxed | |
1951 | // input section. If so, use its address. Otherwise just | |
1952 | // use the start of the output section. This happens with | |
1953 | // relocatable links when the input object has section | |
1954 | // symbols for arbitrary non-merge sections. | |
1955 | const Output_section_data* posd = | |
1956 | os->find_relaxed_input_section(this, shndx); | |
1957 | if (posd != NULL) | |
29e11421 DK |
1958 | { |
1959 | Address relocatable_link_adjustment = | |
1960 | relocatable ? os->address() : 0; | |
1961 | lv.set_output_value(posd->address() | |
1962 | - relocatable_link_adjustment); | |
1963 | } | |
6c172549 DK |
1964 | else |
1965 | lv.set_output_value(os->address()); | |
e29e076a | 1966 | } |
a9a60db6 ILT |
1967 | else |
1968 | { | |
e29e076a ILT |
1969 | // We have to consider the addend to determine the |
1970 | // value to use in a relocation. START is the start | |
29e11421 DK |
1971 | // of this input section. If we are doing a relocatable |
1972 | // link, use offset from start output section instead of | |
1973 | // address. | |
1974 | Address adjusted_start = | |
1975 | relocatable ? start - os->address() : start; | |
a9a60db6 | 1976 | Merged_symbol_value<size>* msv = |
29e11421 DK |
1977 | new Merged_symbol_value<size>(lv.input_value(), |
1978 | adjusted_start); | |
a9a60db6 ILT |
1979 | lv.set_merged_symbol_value(msv); |
1980 | } | |
7bf1f802 ILT |
1981 | } |
1982 | else if (lv.is_tls_symbol()) | |
a9a60db6 | 1983 | lv.set_output_value(os->tls_offset() |
ef15dade | 1984 | + secoffset |
7bf1f802 | 1985 | + lv.input_value()); |
b8e6aad9 | 1986 | else |
b4ecf66b | 1987 | lv.set_output_value((relocatable ? 0 : os->address()) |
ef15dade | 1988 | + secoffset |
7bf1f802 | 1989 | + lv.input_value()); |
75f65a3e ILT |
1990 | } |
1991 | ||
d3bbad62 | 1992 | if (!lv.is_output_symtab_index_set()) |
7bf1f802 ILT |
1993 | { |
1994 | lv.set_output_symtab_index(index); | |
1995 | ++index; | |
1996 | } | |
1997 | } | |
1998 | return index; | |
1999 | } | |
645f8123 | 2000 | |
7bf1f802 | 2001 | // Set the output dynamic symbol table indexes for the local variables. |
c06b7b0b | 2002 | |
7bf1f802 ILT |
2003 | template<int size, bool big_endian> |
2004 | unsigned int | |
2005 | Sized_relobj<size, big_endian>::do_set_local_dynsym_indexes(unsigned int index) | |
2006 | { | |
2007 | const unsigned int loccount = this->local_symbol_count_; | |
2008 | for (unsigned int i = 1; i < loccount; ++i) | |
2009 | { | |
2010 | Symbol_value<size>& lv(this->local_values_[i]); | |
2011 | if (lv.needs_output_dynsym_entry()) | |
2012 | { | |
2013 | lv.set_output_dynsym_index(index); | |
2014 | ++index; | |
2015 | } | |
75f65a3e | 2016 | } |
7bf1f802 ILT |
2017 | return index; |
2018 | } | |
75f65a3e | 2019 | |
7bf1f802 ILT |
2020 | // Set the offset where local dynamic symbol information will be stored. |
2021 | // Returns the count of local symbols contributed to the symbol table by | |
2022 | // this object. | |
61ba1cf9 | 2023 | |
7bf1f802 ILT |
2024 | template<int size, bool big_endian> |
2025 | unsigned int | |
2026 | Sized_relobj<size, big_endian>::do_set_local_dynsym_offset(off_t off) | |
2027 | { | |
2028 | gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); | |
2029 | this->local_dynsym_offset_ = off; | |
2030 | return this->output_local_dynsym_count_; | |
75f65a3e ILT |
2031 | } |
2032 | ||
ef15dade ST |
2033 | // If Symbols_data is not NULL get the section flags from here otherwise |
2034 | // get it from the file. | |
2035 | ||
2036 | template<int size, bool big_endian> | |
2037 | uint64_t | |
2038 | Sized_relobj<size, big_endian>::do_section_flags(unsigned int shndx) | |
2039 | { | |
2040 | Symbols_data* sd = this->get_symbols_data(); | |
2041 | if (sd != NULL) | |
2042 | { | |
2043 | const unsigned char* pshdrs = sd->section_headers_data | |
2044 | + This::shdr_size * shndx; | |
2045 | typename This::Shdr shdr(pshdrs); | |
2046 | return shdr.get_sh_flags(); | |
2047 | } | |
2048 | // If sd is NULL, read the section header from the file. | |
2049 | return this->elf_file_.section_flags(shndx); | |
2050 | } | |
2051 | ||
2052 | // Get the section's ent size from Symbols_data. Called by get_section_contents | |
2053 | // in icf.cc | |
2054 | ||
2055 | template<int size, bool big_endian> | |
2056 | uint64_t | |
2057 | Sized_relobj<size, big_endian>::do_section_entsize(unsigned int shndx) | |
2058 | { | |
2059 | Symbols_data* sd = this->get_symbols_data(); | |
2060 | gold_assert (sd != NULL); | |
2061 | ||
2062 | const unsigned char* pshdrs = sd->section_headers_data | |
2063 | + This::shdr_size * shndx; | |
2064 | typename This::Shdr shdr(pshdrs); | |
2065 | return shdr.get_sh_entsize(); | |
2066 | } | |
2067 | ||
2068 | ||
61ba1cf9 ILT |
2069 | // Write out the local symbols. |
2070 | ||
2071 | template<int size, bool big_endian> | |
2072 | void | |
17a1d0a9 ILT |
2073 | Sized_relobj<size, big_endian>::write_local_symbols( |
2074 | Output_file* of, | |
2075 | const Stringpool* sympool, | |
d491d34e ILT |
2076 | const Stringpool* dynpool, |
2077 | Output_symtab_xindex* symtab_xindex, | |
2078 | Output_symtab_xindex* dynsym_xindex) | |
61ba1cf9 | 2079 | { |
99e9a495 ILT |
2080 | const bool strip_all = parameters->options().strip_all(); |
2081 | if (strip_all) | |
2082 | { | |
2083 | if (this->output_local_dynsym_count_ == 0) | |
2084 | return; | |
2085 | this->output_local_symbol_count_ = 0; | |
2086 | } | |
9e2dcb77 | 2087 | |
a3ad94ed | 2088 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 2089 | if (this->symtab_shndx_ == 0) |
61ba1cf9 ILT |
2090 | { |
2091 | // This object has no symbols. Weird but legal. | |
2092 | return; | |
2093 | } | |
2094 | ||
2095 | // Read the symbol table section header. | |
2ea97941 | 2096 | const unsigned int symtab_shndx = this->symtab_shndx_; |
645f8123 | 2097 | typename This::Shdr symtabshdr(this, |
2ea97941 | 2098 | this->elf_file_.section_header(symtab_shndx)); |
a3ad94ed | 2099 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
92e059d8 | 2100 | const unsigned int loccount = this->local_symbol_count_; |
a3ad94ed | 2101 | gold_assert(loccount == symtabshdr.get_sh_info()); |
61ba1cf9 ILT |
2102 | |
2103 | // Read the local symbols. | |
2ea97941 ILT |
2104 | const int sym_size = This::sym_size; |
2105 | off_t locsize = loccount * sym_size; | |
61ba1cf9 | 2106 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
39d0cb0e | 2107 | locsize, true, false); |
61ba1cf9 | 2108 | |
61ba1cf9 | 2109 | // Read the symbol names. |
d491d34e ILT |
2110 | const unsigned int strtab_shndx = |
2111 | this->adjust_shndx(symtabshdr.get_sh_link()); | |
8383303e | 2112 | section_size_type strtab_size; |
645f8123 | 2113 | const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
9eb9fa57 | 2114 | &strtab_size, |
cb295612 | 2115 | false); |
61ba1cf9 ILT |
2116 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
2117 | ||
7bf1f802 ILT |
2118 | // Get views into the output file for the portions of the symbol table |
2119 | // and the dynamic symbol table that we will be writing. | |
2ea97941 | 2120 | off_t output_size = this->output_local_symbol_count_ * sym_size; |
f2619d6c | 2121 | unsigned char* oview = NULL; |
7bf1f802 ILT |
2122 | if (output_size > 0) |
2123 | oview = of->get_output_view(this->local_symbol_offset_, output_size); | |
2124 | ||
2ea97941 | 2125 | off_t dyn_output_size = this->output_local_dynsym_count_ * sym_size; |
7bf1f802 ILT |
2126 | unsigned char* dyn_oview = NULL; |
2127 | if (dyn_output_size > 0) | |
2128 | dyn_oview = of->get_output_view(this->local_dynsym_offset_, | |
2129 | dyn_output_size); | |
61ba1cf9 | 2130 | |
ef9beddf | 2131 | const Output_sections out_sections(this->output_sections()); |
c06b7b0b | 2132 | |
a3ad94ed | 2133 | gold_assert(this->local_values_.size() == loccount); |
61ba1cf9 | 2134 | |
61ba1cf9 | 2135 | unsigned char* ov = oview; |
7bf1f802 | 2136 | unsigned char* dyn_ov = dyn_oview; |
2ea97941 ILT |
2137 | psyms += sym_size; |
2138 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) | |
61ba1cf9 ILT |
2139 | { |
2140 | elfcpp::Sym<size, big_endian> isym(psyms); | |
f6ce93d6 | 2141 | |
d491d34e ILT |
2142 | Symbol_value<size>& lv(this->local_values_[i]); |
2143 | ||
2144 | bool is_ordinary; | |
2145 | unsigned int st_shndx = this->adjust_sym_shndx(i, isym.get_st_shndx(), | |
2146 | &is_ordinary); | |
2147 | if (is_ordinary) | |
61ba1cf9 | 2148 | { |
ef9beddf ILT |
2149 | gold_assert(st_shndx < out_sections.size()); |
2150 | if (out_sections[st_shndx] == NULL) | |
61ba1cf9 | 2151 | continue; |
ef9beddf | 2152 | st_shndx = out_sections[st_shndx]->out_shndx(); |
d491d34e ILT |
2153 | if (st_shndx >= elfcpp::SHN_LORESERVE) |
2154 | { | |
d3bbad62 | 2155 | if (lv.has_output_symtab_entry()) |
d491d34e | 2156 | symtab_xindex->add(lv.output_symtab_index(), st_shndx); |
d3bbad62 | 2157 | if (lv.has_output_dynsym_entry()) |
d491d34e ILT |
2158 | dynsym_xindex->add(lv.output_dynsym_index(), st_shndx); |
2159 | st_shndx = elfcpp::SHN_XINDEX; | |
2160 | } | |
61ba1cf9 ILT |
2161 | } |
2162 | ||
7bf1f802 | 2163 | // Write the symbol to the output symbol table. |
d3bbad62 | 2164 | if (lv.has_output_symtab_entry()) |
7bf1f802 ILT |
2165 | { |
2166 | elfcpp::Sym_write<size, big_endian> osym(ov); | |
2167 | ||
2168 | gold_assert(isym.get_st_name() < strtab_size); | |
2ea97941 ILT |
2169 | const char* name = pnames + isym.get_st_name(); |
2170 | osym.put_st_name(sympool->get_offset(name)); | |
7bf1f802 ILT |
2171 | osym.put_st_value(this->local_values_[i].value(this, 0)); |
2172 | osym.put_st_size(isym.get_st_size()); | |
2173 | osym.put_st_info(isym.get_st_info()); | |
2174 | osym.put_st_other(isym.get_st_other()); | |
2175 | osym.put_st_shndx(st_shndx); | |
2176 | ||
2ea97941 | 2177 | ov += sym_size; |
7bf1f802 ILT |
2178 | } |
2179 | ||
2180 | // Write the symbol to the output dynamic symbol table. | |
d3bbad62 | 2181 | if (lv.has_output_dynsym_entry()) |
7bf1f802 ILT |
2182 | { |
2183 | gold_assert(dyn_ov < dyn_oview + dyn_output_size); | |
2184 | elfcpp::Sym_write<size, big_endian> osym(dyn_ov); | |
2185 | ||
2186 | gold_assert(isym.get_st_name() < strtab_size); | |
2ea97941 ILT |
2187 | const char* name = pnames + isym.get_st_name(); |
2188 | osym.put_st_name(dynpool->get_offset(name)); | |
7bf1f802 ILT |
2189 | osym.put_st_value(this->local_values_[i].value(this, 0)); |
2190 | osym.put_st_size(isym.get_st_size()); | |
2191 | osym.put_st_info(isym.get_st_info()); | |
2192 | osym.put_st_other(isym.get_st_other()); | |
2193 | osym.put_st_shndx(st_shndx); | |
2194 | ||
2ea97941 | 2195 | dyn_ov += sym_size; |
7bf1f802 ILT |
2196 | } |
2197 | } | |
f6ce93d6 | 2198 | |
61ba1cf9 | 2199 | |
7bf1f802 ILT |
2200 | if (output_size > 0) |
2201 | { | |
2202 | gold_assert(ov - oview == output_size); | |
2203 | of->write_output_view(this->local_symbol_offset_, output_size, oview); | |
61ba1cf9 ILT |
2204 | } |
2205 | ||
7bf1f802 ILT |
2206 | if (dyn_output_size > 0) |
2207 | { | |
2208 | gold_assert(dyn_ov - dyn_oview == dyn_output_size); | |
2209 | of->write_output_view(this->local_dynsym_offset_, dyn_output_size, | |
2210 | dyn_oview); | |
2211 | } | |
61ba1cf9 ILT |
2212 | } |
2213 | ||
f7e2ee48 ILT |
2214 | // Set *INFO to symbolic information about the offset OFFSET in the |
2215 | // section SHNDX. Return true if we found something, false if we | |
2216 | // found nothing. | |
2217 | ||
2218 | template<int size, bool big_endian> | |
2219 | bool | |
2220 | Sized_relobj<size, big_endian>::get_symbol_location_info( | |
2221 | unsigned int shndx, | |
2ea97941 | 2222 | off_t offset, |
f7e2ee48 ILT |
2223 | Symbol_location_info* info) |
2224 | { | |
2225 | if (this->symtab_shndx_ == 0) | |
2226 | return false; | |
2227 | ||
8383303e | 2228 | section_size_type symbols_size; |
f7e2ee48 ILT |
2229 | const unsigned char* symbols = this->section_contents(this->symtab_shndx_, |
2230 | &symbols_size, | |
2231 | false); | |
2232 | ||
d491d34e ILT |
2233 | unsigned int symbol_names_shndx = |
2234 | this->adjust_shndx(this->section_link(this->symtab_shndx_)); | |
8383303e | 2235 | section_size_type names_size; |
f7e2ee48 ILT |
2236 | const unsigned char* symbol_names_u = |
2237 | this->section_contents(symbol_names_shndx, &names_size, false); | |
2238 | const char* symbol_names = reinterpret_cast<const char*>(symbol_names_u); | |
2239 | ||
2ea97941 ILT |
2240 | const int sym_size = This::sym_size; |
2241 | const size_t count = symbols_size / sym_size; | |
f7e2ee48 ILT |
2242 | |
2243 | const unsigned char* p = symbols; | |
2ea97941 | 2244 | for (size_t i = 0; i < count; ++i, p += sym_size) |
f7e2ee48 ILT |
2245 | { |
2246 | elfcpp::Sym<size, big_endian> sym(p); | |
2247 | ||
2248 | if (sym.get_st_type() == elfcpp::STT_FILE) | |
2249 | { | |
2250 | if (sym.get_st_name() >= names_size) | |
2251 | info->source_file = "(invalid)"; | |
2252 | else | |
2253 | info->source_file = symbol_names + sym.get_st_name(); | |
d491d34e | 2254 | continue; |
f7e2ee48 | 2255 | } |
d491d34e ILT |
2256 | |
2257 | bool is_ordinary; | |
2258 | unsigned int st_shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(), | |
2259 | &is_ordinary); | |
2260 | if (is_ordinary | |
2261 | && st_shndx == shndx | |
2ea97941 | 2262 | && static_cast<off_t>(sym.get_st_value()) <= offset |
d491d34e | 2263 | && (static_cast<off_t>(sym.get_st_value() + sym.get_st_size()) |
2ea97941 | 2264 | > offset)) |
f7e2ee48 ILT |
2265 | { |
2266 | if (sym.get_st_name() > names_size) | |
2267 | info->enclosing_symbol_name = "(invalid)"; | |
2268 | else | |
a2b1aa12 ILT |
2269 | { |
2270 | info->enclosing_symbol_name = symbol_names + sym.get_st_name(); | |
086a1841 | 2271 | if (parameters->options().do_demangle()) |
a2b1aa12 ILT |
2272 | { |
2273 | char* demangled_name = cplus_demangle( | |
2274 | info->enclosing_symbol_name.c_str(), | |
2275 | DMGL_ANSI | DMGL_PARAMS); | |
2276 | if (demangled_name != NULL) | |
2277 | { | |
2278 | info->enclosing_symbol_name.assign(demangled_name); | |
2279 | free(demangled_name); | |
2280 | } | |
2281 | } | |
2282 | } | |
f7e2ee48 ILT |
2283 | return true; |
2284 | } | |
2285 | } | |
2286 | ||
2287 | return false; | |
2288 | } | |
2289 | ||
e94cf127 CC |
2290 | // Look for a kept section corresponding to the given discarded section, |
2291 | // and return its output address. This is used only for relocations in | |
2292 | // debugging sections. If we can't find the kept section, return 0. | |
2293 | ||
2294 | template<int size, bool big_endian> | |
2295 | typename Sized_relobj<size, big_endian>::Address | |
2296 | Sized_relobj<size, big_endian>::map_to_kept_section( | |
2297 | unsigned int shndx, | |
2298 | bool* found) const | |
2299 | { | |
1ef4d87f ILT |
2300 | Relobj* kept_object; |
2301 | unsigned int kept_shndx; | |
2302 | if (this->get_kept_comdat_section(shndx, &kept_object, &kept_shndx)) | |
e94cf127 | 2303 | { |
1ef4d87f ILT |
2304 | Sized_relobj<size, big_endian>* kept_relobj = |
2305 | static_cast<Sized_relobj<size, big_endian>*>(kept_object); | |
2306 | Output_section* os = kept_relobj->output_section(kept_shndx); | |
2ea97941 ILT |
2307 | Address offset = kept_relobj->get_output_section_offset(kept_shndx); |
2308 | if (os != NULL && offset != invalid_address) | |
1ef4d87f ILT |
2309 | { |
2310 | *found = true; | |
2ea97941 | 2311 | return os->address() + offset; |
1ef4d87f | 2312 | } |
e94cf127 CC |
2313 | } |
2314 | *found = false; | |
2315 | return 0; | |
2316 | } | |
2317 | ||
92de84a6 ILT |
2318 | // Get symbol counts. |
2319 | ||
2320 | template<int size, bool big_endian> | |
2321 | void | |
2322 | Sized_relobj<size, big_endian>::do_get_global_symbol_counts( | |
2323 | const Symbol_table*, | |
2324 | size_t* defined, | |
2325 | size_t* used) const | |
2326 | { | |
2327 | *defined = this->defined_count_; | |
2328 | size_t count = 0; | |
2329 | for (Symbols::const_iterator p = this->symbols_.begin(); | |
2330 | p != this->symbols_.end(); | |
2331 | ++p) | |
2332 | if (*p != NULL | |
2333 | && (*p)->source() == Symbol::FROM_OBJECT | |
2334 | && (*p)->object() == this | |
2335 | && (*p)->is_defined()) | |
2336 | ++count; | |
2337 | *used = count; | |
2338 | } | |
2339 | ||
54dc6425 ILT |
2340 | // Input_objects methods. |
2341 | ||
008db82e ILT |
2342 | // Add a regular relocatable object to the list. Return false if this |
2343 | // object should be ignored. | |
f6ce93d6 | 2344 | |
008db82e | 2345 | bool |
54dc6425 ILT |
2346 | Input_objects::add_object(Object* obj) |
2347 | { | |
c5818ff1 CC |
2348 | // Print the filename if the -t/--trace option is selected. |
2349 | if (parameters->options().trace()) | |
2350 | gold_info("%s", obj->name().c_str()); | |
2351 | ||
008db82e | 2352 | if (!obj->is_dynamic()) |
f6ce93d6 | 2353 | this->relobj_list_.push_back(static_cast<Relobj*>(obj)); |
008db82e ILT |
2354 | else |
2355 | { | |
2356 | // See if this is a duplicate SONAME. | |
2357 | Dynobj* dynobj = static_cast<Dynobj*>(obj); | |
9a2d6984 | 2358 | const char* soname = dynobj->soname(); |
008db82e ILT |
2359 | |
2360 | std::pair<Unordered_set<std::string>::iterator, bool> ins = | |
9a2d6984 | 2361 | this->sonames_.insert(soname); |
008db82e ILT |
2362 | if (!ins.second) |
2363 | { | |
2364 | // We have already seen a dynamic object with this soname. | |
2365 | return false; | |
2366 | } | |
2367 | ||
2368 | this->dynobj_list_.push_back(dynobj); | |
2369 | } | |
75f65a3e | 2370 | |
92de84a6 | 2371 | // Add this object to the cross-referencer if requested. |
dde3f402 ILT |
2372 | if (parameters->options().user_set_print_symbol_counts() |
2373 | || parameters->options().cref()) | |
92de84a6 ILT |
2374 | { |
2375 | if (this->cref_ == NULL) | |
2376 | this->cref_ = new Cref(); | |
2377 | this->cref_->add_object(obj); | |
2378 | } | |
2379 | ||
008db82e | 2380 | return true; |
54dc6425 ILT |
2381 | } |
2382 | ||
e2827e5f ILT |
2383 | // For each dynamic object, record whether we've seen all of its |
2384 | // explicit dependencies. | |
2385 | ||
2386 | void | |
2387 | Input_objects::check_dynamic_dependencies() const | |
2388 | { | |
7eaea549 | 2389 | bool issued_copy_dt_needed_error = false; |
e2827e5f ILT |
2390 | for (Dynobj_list::const_iterator p = this->dynobj_list_.begin(); |
2391 | p != this->dynobj_list_.end(); | |
2392 | ++p) | |
2393 | { | |
2394 | const Dynobj::Needed& needed((*p)->needed()); | |
2395 | bool found_all = true; | |
7eaea549 ILT |
2396 | Dynobj::Needed::const_iterator pneeded; |
2397 | for (pneeded = needed.begin(); pneeded != needed.end(); ++pneeded) | |
e2827e5f ILT |
2398 | { |
2399 | if (this->sonames_.find(*pneeded) == this->sonames_.end()) | |
2400 | { | |
2401 | found_all = false; | |
2402 | break; | |
2403 | } | |
2404 | } | |
2405 | (*p)->set_has_unknown_needed_entries(!found_all); | |
7eaea549 ILT |
2406 | |
2407 | // --copy-dt-needed-entries aka --add-needed is a GNU ld option | |
612bdda1 ILT |
2408 | // that gold does not support. However, they cause no trouble |
2409 | // unless there is a DT_NEEDED entry that we don't know about; | |
2410 | // warn only in that case. | |
7eaea549 ILT |
2411 | if (!found_all |
2412 | && !issued_copy_dt_needed_error | |
2413 | && (parameters->options().copy_dt_needed_entries() | |
2414 | || parameters->options().add_needed())) | |
2415 | { | |
2416 | const char* optname; | |
2417 | if (parameters->options().copy_dt_needed_entries()) | |
2418 | optname = "--copy-dt-needed-entries"; | |
2419 | else | |
2420 | optname = "--add-needed"; | |
2421 | gold_error(_("%s is not supported but is required for %s in %s"), | |
2422 | optname, (*pneeded).c_str(), (*p)->name().c_str()); | |
2423 | issued_copy_dt_needed_error = true; | |
2424 | } | |
e2827e5f ILT |
2425 | } |
2426 | } | |
2427 | ||
92de84a6 ILT |
2428 | // Start processing an archive. |
2429 | ||
2430 | void | |
2431 | Input_objects::archive_start(Archive* archive) | |
2432 | { | |
dde3f402 ILT |
2433 | if (parameters->options().user_set_print_symbol_counts() |
2434 | || parameters->options().cref()) | |
92de84a6 ILT |
2435 | { |
2436 | if (this->cref_ == NULL) | |
2437 | this->cref_ = new Cref(); | |
2438 | this->cref_->add_archive_start(archive); | |
2439 | } | |
2440 | } | |
2441 | ||
2442 | // Stop processing an archive. | |
2443 | ||
2444 | void | |
2445 | Input_objects::archive_stop(Archive* archive) | |
2446 | { | |
dde3f402 ILT |
2447 | if (parameters->options().user_set_print_symbol_counts() |
2448 | || parameters->options().cref()) | |
92de84a6 ILT |
2449 | this->cref_->add_archive_stop(archive); |
2450 | } | |
2451 | ||
2452 | // Print symbol counts | |
2453 | ||
2454 | void | |
2455 | Input_objects::print_symbol_counts(const Symbol_table* symtab) const | |
2456 | { | |
2457 | if (parameters->options().user_set_print_symbol_counts() | |
2458 | && this->cref_ != NULL) | |
2459 | this->cref_->print_symbol_counts(symtab); | |
2460 | } | |
2461 | ||
dde3f402 ILT |
2462 | // Print a cross reference table. |
2463 | ||
2464 | void | |
2465 | Input_objects::print_cref(const Symbol_table* symtab, FILE* f) const | |
2466 | { | |
2467 | if (parameters->options().cref() && this->cref_ != NULL) | |
2468 | this->cref_->print_cref(symtab, f); | |
2469 | } | |
2470 | ||
92e059d8 ILT |
2471 | // Relocate_info methods. |
2472 | ||
2473 | // Return a string describing the location of a relocation. This is | |
2474 | // only used in error messages. | |
2475 | ||
2476 | template<int size, bool big_endian> | |
2477 | std::string | |
f7e2ee48 | 2478 | Relocate_info<size, big_endian>::location(size_t, off_t offset) const |
92e059d8 | 2479 | { |
5c2c6c95 ILT |
2480 | // See if we can get line-number information from debugging sections. |
2481 | std::string filename; | |
2482 | std::string file_and_lineno; // Better than filename-only, if available. | |
4c50553d | 2483 | |
a55ce7fe | 2484 | Sized_dwarf_line_info<size, big_endian> line_info(this->object); |
24badc65 ILT |
2485 | // This will be "" if we failed to parse the debug info for any reason. |
2486 | file_and_lineno = line_info.addr2line(this->data_shndx, offset); | |
4c50553d | 2487 | |
92e059d8 | 2488 | std::string ret(this->object->name()); |
f7e2ee48 ILT |
2489 | ret += ':'; |
2490 | Symbol_location_info info; | |
2491 | if (this->object->get_symbol_location_info(this->data_shndx, offset, &info)) | |
2492 | { | |
2493 | ret += " in function "; | |
2494 | ret += info.enclosing_symbol_name; | |
2495 | ret += ":"; | |
5c2c6c95 ILT |
2496 | filename = info.source_file; |
2497 | } | |
2498 | ||
2499 | if (!file_and_lineno.empty()) | |
2500 | ret += file_and_lineno; | |
2501 | else | |
2502 | { | |
2503 | if (!filename.empty()) | |
2504 | ret += filename; | |
2505 | ret += "("; | |
2506 | ret += this->object->section_name(this->data_shndx); | |
2507 | char buf[100]; | |
2508 | // Offsets into sections have to be positive. | |
2509 | snprintf(buf, sizeof(buf), "+0x%lx", static_cast<long>(offset)); | |
2510 | ret += buf; | |
2511 | ret += ")"; | |
f7e2ee48 | 2512 | } |
92e059d8 ILT |
2513 | return ret; |
2514 | } | |
2515 | ||
bae7f79e ILT |
2516 | } // End namespace gold. |
2517 | ||
2518 | namespace | |
2519 | { | |
2520 | ||
2521 | using namespace gold; | |
2522 | ||
2523 | // Read an ELF file with the header and return the appropriate | |
2524 | // instance of Object. | |
2525 | ||
2526 | template<int size, bool big_endian> | |
2527 | Object* | |
2528 | make_elf_sized_object(const std::string& name, Input_file* input_file, | |
029ba973 ILT |
2529 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr, |
2530 | bool* punconfigured) | |
bae7f79e | 2531 | { |
f733487b DK |
2532 | Target* target = select_target(ehdr.get_e_machine(), size, big_endian, |
2533 | ehdr.get_e_ident()[elfcpp::EI_OSABI], | |
2534 | ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); | |
2535 | if (target == NULL) | |
2536 | gold_fatal(_("%s: unsupported ELF machine number %d"), | |
2537 | name.c_str(), ehdr.get_e_machine()); | |
029ba973 ILT |
2538 | |
2539 | if (!parameters->target_valid()) | |
2540 | set_parameters_target(target); | |
2541 | else if (target != ¶meters->target()) | |
2542 | { | |
2543 | if (punconfigured != NULL) | |
2544 | *punconfigured = true; | |
2545 | else | |
2546 | gold_error(_("%s: incompatible target"), name.c_str()); | |
2547 | return NULL; | |
2548 | } | |
2549 | ||
f733487b DK |
2550 | return target->make_elf_object<size, big_endian>(name, input_file, offset, |
2551 | ehdr); | |
bae7f79e ILT |
2552 | } |
2553 | ||
2554 | } // End anonymous namespace. | |
2555 | ||
2556 | namespace gold | |
2557 | { | |
2558 | ||
f6060a4d ILT |
2559 | // Return whether INPUT_FILE is an ELF object. |
2560 | ||
2561 | bool | |
2562 | is_elf_object(Input_file* input_file, off_t offset, | |
2563 | const unsigned char** start, int *read_size) | |
2564 | { | |
2565 | off_t filesize = input_file->file().filesize(); | |
c549a694 | 2566 | int want = elfcpp::Elf_recognizer::max_header_size; |
f6060a4d ILT |
2567 | if (filesize - offset < want) |
2568 | want = filesize - offset; | |
2569 | ||
2570 | const unsigned char* p = input_file->file().get_view(offset, 0, want, | |
2571 | true, false); | |
2572 | *start = p; | |
2573 | *read_size = want; | |
2574 | ||
c549a694 | 2575 | return elfcpp::Elf_recognizer::is_elf_file(p, want); |
f6060a4d ILT |
2576 | } |
2577 | ||
bae7f79e ILT |
2578 | // Read an ELF file and return the appropriate instance of Object. |
2579 | ||
2580 | Object* | |
2581 | make_elf_object(const std::string& name, Input_file* input_file, off_t offset, | |
15f8229b ILT |
2582 | const unsigned char* p, section_offset_type bytes, |
2583 | bool* punconfigured) | |
bae7f79e | 2584 | { |
15f8229b ILT |
2585 | if (punconfigured != NULL) |
2586 | *punconfigured = false; | |
2587 | ||
c549a694 | 2588 | std::string error; |
ac33a407 DK |
2589 | bool big_endian = false; |
2590 | int size = 0; | |
c549a694 ILT |
2591 | if (!elfcpp::Elf_recognizer::is_valid_header(p, bytes, &size, |
2592 | &big_endian, &error)) | |
bae7f79e | 2593 | { |
c549a694 | 2594 | gold_error(_("%s: %s"), name.c_str(), error.c_str()); |
75f2446e | 2595 | return NULL; |
bae7f79e ILT |
2596 | } |
2597 | ||
c549a694 | 2598 | if (size == 32) |
bae7f79e | 2599 | { |
bae7f79e ILT |
2600 | if (big_endian) |
2601 | { | |
193a53d9 | 2602 | #ifdef HAVE_TARGET_32_BIG |
bae7f79e ILT |
2603 | elfcpp::Ehdr<32, true> ehdr(p); |
2604 | return make_elf_sized_object<32, true>(name, input_file, | |
029ba973 | 2605 | offset, ehdr, punconfigured); |
193a53d9 | 2606 | #else |
15f8229b ILT |
2607 | if (punconfigured != NULL) |
2608 | *punconfigured = true; | |
2609 | else | |
2610 | gold_error(_("%s: not configured to support " | |
2611 | "32-bit big-endian object"), | |
2612 | name.c_str()); | |
75f2446e | 2613 | return NULL; |
193a53d9 | 2614 | #endif |
bae7f79e ILT |
2615 | } |
2616 | else | |
2617 | { | |
193a53d9 | 2618 | #ifdef HAVE_TARGET_32_LITTLE |
bae7f79e ILT |
2619 | elfcpp::Ehdr<32, false> ehdr(p); |
2620 | return make_elf_sized_object<32, false>(name, input_file, | |
029ba973 | 2621 | offset, ehdr, punconfigured); |
193a53d9 | 2622 | #else |
15f8229b ILT |
2623 | if (punconfigured != NULL) |
2624 | *punconfigured = true; | |
2625 | else | |
2626 | gold_error(_("%s: not configured to support " | |
2627 | "32-bit little-endian object"), | |
2628 | name.c_str()); | |
75f2446e | 2629 | return NULL; |
193a53d9 | 2630 | #endif |
bae7f79e ILT |
2631 | } |
2632 | } | |
c549a694 | 2633 | else if (size == 64) |
bae7f79e | 2634 | { |
bae7f79e ILT |
2635 | if (big_endian) |
2636 | { | |
193a53d9 | 2637 | #ifdef HAVE_TARGET_64_BIG |
bae7f79e ILT |
2638 | elfcpp::Ehdr<64, true> ehdr(p); |
2639 | return make_elf_sized_object<64, true>(name, input_file, | |
029ba973 | 2640 | offset, ehdr, punconfigured); |
193a53d9 | 2641 | #else |
15f8229b ILT |
2642 | if (punconfigured != NULL) |
2643 | *punconfigured = true; | |
2644 | else | |
2645 | gold_error(_("%s: not configured to support " | |
2646 | "64-bit big-endian object"), | |
2647 | name.c_str()); | |
75f2446e | 2648 | return NULL; |
193a53d9 | 2649 | #endif |
bae7f79e ILT |
2650 | } |
2651 | else | |
2652 | { | |
193a53d9 | 2653 | #ifdef HAVE_TARGET_64_LITTLE |
bae7f79e ILT |
2654 | elfcpp::Ehdr<64, false> ehdr(p); |
2655 | return make_elf_sized_object<64, false>(name, input_file, | |
029ba973 | 2656 | offset, ehdr, punconfigured); |
193a53d9 | 2657 | #else |
15f8229b ILT |
2658 | if (punconfigured != NULL) |
2659 | *punconfigured = true; | |
2660 | else | |
2661 | gold_error(_("%s: not configured to support " | |
2662 | "64-bit little-endian object"), | |
2663 | name.c_str()); | |
75f2446e | 2664 | return NULL; |
193a53d9 | 2665 | #endif |
bae7f79e ILT |
2666 | } |
2667 | } | |
c549a694 ILT |
2668 | else |
2669 | gold_unreachable(); | |
bae7f79e ILT |
2670 | } |
2671 | ||
04bf7072 ILT |
2672 | // Instantiate the templates we need. |
2673 | ||
2674 | #ifdef HAVE_TARGET_32_LITTLE | |
2675 | template | |
2676 | void | |
2677 | Object::read_section_data<32, false>(elfcpp::Elf_file<32, false, Object>*, | |
2678 | Read_symbols_data*); | |
2679 | #endif | |
2680 | ||
2681 | #ifdef HAVE_TARGET_32_BIG | |
2682 | template | |
2683 | void | |
2684 | Object::read_section_data<32, true>(elfcpp::Elf_file<32, true, Object>*, | |
2685 | Read_symbols_data*); | |
2686 | #endif | |
2687 | ||
2688 | #ifdef HAVE_TARGET_64_LITTLE | |
2689 | template | |
2690 | void | |
2691 | Object::read_section_data<64, false>(elfcpp::Elf_file<64, false, Object>*, | |
2692 | Read_symbols_data*); | |
2693 | #endif | |
2694 | ||
2695 | #ifdef HAVE_TARGET_64_BIG | |
2696 | template | |
2697 | void | |
2698 | Object::read_section_data<64, true>(elfcpp::Elf_file<64, true, Object>*, | |
2699 | Read_symbols_data*); | |
2700 | #endif | |
bae7f79e | 2701 | |
193a53d9 | 2702 | #ifdef HAVE_TARGET_32_LITTLE |
bae7f79e | 2703 | template |
f6ce93d6 | 2704 | class Sized_relobj<32, false>; |
193a53d9 | 2705 | #endif |
bae7f79e | 2706 | |
193a53d9 | 2707 | #ifdef HAVE_TARGET_32_BIG |
bae7f79e | 2708 | template |
f6ce93d6 | 2709 | class Sized_relobj<32, true>; |
193a53d9 | 2710 | #endif |
bae7f79e | 2711 | |
193a53d9 | 2712 | #ifdef HAVE_TARGET_64_LITTLE |
bae7f79e | 2713 | template |
f6ce93d6 | 2714 | class Sized_relobj<64, false>; |
193a53d9 | 2715 | #endif |
bae7f79e | 2716 | |
193a53d9 | 2717 | #ifdef HAVE_TARGET_64_BIG |
bae7f79e | 2718 | template |
f6ce93d6 | 2719 | class Sized_relobj<64, true>; |
193a53d9 | 2720 | #endif |
bae7f79e | 2721 | |
193a53d9 | 2722 | #ifdef HAVE_TARGET_32_LITTLE |
92e059d8 ILT |
2723 | template |
2724 | struct Relocate_info<32, false>; | |
193a53d9 | 2725 | #endif |
92e059d8 | 2726 | |
193a53d9 | 2727 | #ifdef HAVE_TARGET_32_BIG |
92e059d8 ILT |
2728 | template |
2729 | struct Relocate_info<32, true>; | |
193a53d9 | 2730 | #endif |
92e059d8 | 2731 | |
193a53d9 | 2732 | #ifdef HAVE_TARGET_64_LITTLE |
92e059d8 ILT |
2733 | template |
2734 | struct Relocate_info<64, false>; | |
193a53d9 | 2735 | #endif |
92e059d8 | 2736 | |
193a53d9 | 2737 | #ifdef HAVE_TARGET_64_BIG |
92e059d8 ILT |
2738 | template |
2739 | struct Relocate_info<64, true>; | |
193a53d9 | 2740 | #endif |
92e059d8 | 2741 | |
9d3b86f6 ILT |
2742 | #ifdef HAVE_TARGET_32_LITTLE |
2743 | template | |
2744 | void | |
2745 | Xindex::initialize_symtab_xindex<32, false>(Object*, unsigned int); | |
2746 | ||
2747 | template | |
2748 | void | |
2749 | Xindex::read_symtab_xindex<32, false>(Object*, unsigned int, | |
2750 | const unsigned char*); | |
2751 | #endif | |
2752 | ||
2753 | #ifdef HAVE_TARGET_32_BIG | |
2754 | template | |
2755 | void | |
2756 | Xindex::initialize_symtab_xindex<32, true>(Object*, unsigned int); | |
2757 | ||
2758 | template | |
2759 | void | |
2760 | Xindex::read_symtab_xindex<32, true>(Object*, unsigned int, | |
2761 | const unsigned char*); | |
2762 | #endif | |
2763 | ||
2764 | #ifdef HAVE_TARGET_64_LITTLE | |
2765 | template | |
2766 | void | |
2767 | Xindex::initialize_symtab_xindex<64, false>(Object*, unsigned int); | |
2768 | ||
2769 | template | |
2770 | void | |
2771 | Xindex::read_symtab_xindex<64, false>(Object*, unsigned int, | |
2772 | const unsigned char*); | |
2773 | #endif | |
2774 | ||
2775 | #ifdef HAVE_TARGET_64_BIG | |
2776 | template | |
2777 | void | |
2778 | Xindex::initialize_symtab_xindex<64, true>(Object*, unsigned int); | |
2779 | ||
2780 | template | |
2781 | void | |
2782 | Xindex::read_symtab_xindex<64, true>(Object*, unsigned int, | |
2783 | const unsigned char*); | |
2784 | #endif | |
2785 | ||
bae7f79e | 2786 | } // End namespace gold. |