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a2fb1b05 ILT |
1 | // layout.cc -- lay out output file sections for gold |
2 | ||
6cb15b7f ILT |
3 | // Copyright 2006, 2007 Free Software Foundation, Inc. |
4 | // Written by Ian Lance Taylor <iant@google.com>. | |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
a2fb1b05 ILT |
23 | #include "gold.h" |
24 | ||
a2fb1b05 | 25 | #include <cstring> |
54dc6425 | 26 | #include <algorithm> |
a2fb1b05 ILT |
27 | #include <iostream> |
28 | #include <utility> | |
29 | ||
7e1edb90 | 30 | #include "parameters.h" |
a2fb1b05 | 31 | #include "output.h" |
f6ce93d6 | 32 | #include "symtab.h" |
a3ad94ed | 33 | #include "dynobj.h" |
3151305a | 34 | #include "ehframe.h" |
96803768 | 35 | #include "compressed_output.h" |
a2fb1b05 ILT |
36 | #include "layout.h" |
37 | ||
38 | namespace gold | |
39 | { | |
40 | ||
92e059d8 | 41 | // Layout_task_runner methods. |
a2fb1b05 ILT |
42 | |
43 | // Lay out the sections. This is called after all the input objects | |
44 | // have been read. | |
45 | ||
46 | void | |
92e059d8 | 47 | Layout_task_runner::run(Workqueue* workqueue) |
a2fb1b05 | 48 | { |
12e14209 ILT |
49 | off_t file_size = this->layout_->finalize(this->input_objects_, |
50 | this->symtab_); | |
61ba1cf9 ILT |
51 | |
52 | // Now we know the final size of the output file and we know where | |
53 | // each piece of information goes. | |
c51e6221 ILT |
54 | Output_file* of = new Output_file(this->options_, |
55 | this->input_objects_->target()); | |
61ba1cf9 ILT |
56 | of->open(file_size); |
57 | ||
58 | // Queue up the final set of tasks. | |
59 | gold::queue_final_tasks(this->options_, this->input_objects_, | |
12e14209 | 60 | this->symtab_, this->layout_, workqueue, of); |
a2fb1b05 ILT |
61 | } |
62 | ||
63 | // Layout methods. | |
64 | ||
54dc6425 | 65 | Layout::Layout(const General_options& options) |
a3ad94ed | 66 | : options_(options), namepool_(), sympool_(), dynpool_(), signatures_(), |
61ba1cf9 | 67 | section_name_map_(), segment_list_(), section_list_(), |
a3ad94ed | 68 | unattached_section_list_(), special_output_list_(), |
27bc2bce | 69 | section_headers_(NULL), tls_segment_(NULL), symtab_section_(NULL), |
3151305a | 70 | dynsym_section_(NULL), dynamic_section_(NULL), dynamic_data_(NULL), |
35cdfc9a ILT |
71 | eh_frame_section_(NULL), output_file_size_(-1), |
72 | input_requires_executable_stack_(false), | |
73 | input_with_gnu_stack_note_(false), | |
535890bb ILT |
74 | input_without_gnu_stack_note_(false), |
75 | has_static_tls_(false) | |
54dc6425 ILT |
76 | { |
77 | // Make space for more than enough segments for a typical file. | |
78 | // This is just for efficiency--it's OK if we wind up needing more. | |
a3ad94ed ILT |
79 | this->segment_list_.reserve(12); |
80 | ||
27bc2bce ILT |
81 | // We expect two unattached Output_data objects: the file header and |
82 | // the segment headers. | |
83 | this->special_output_list_.reserve(2); | |
54dc6425 ILT |
84 | } |
85 | ||
a2fb1b05 ILT |
86 | // Hash a key we use to look up an output section mapping. |
87 | ||
88 | size_t | |
89 | Layout::Hash_key::operator()(const Layout::Key& k) const | |
90 | { | |
f0641a0b | 91 | return k.first + k.second.first + k.second.second; |
a2fb1b05 ILT |
92 | } |
93 | ||
9e2dcb77 ILT |
94 | // Return whether PREFIX is a prefix of STR. |
95 | ||
96 | static inline bool | |
97 | is_prefix_of(const char* prefix, const char* str) | |
98 | { | |
99 | return strncmp(prefix, str, strlen(prefix)) == 0; | |
100 | } | |
101 | ||
02d2ba74 ILT |
102 | // Returns whether the given section is in the list of |
103 | // debug-sections-used-by-some-version-of-gdb. Currently, | |
104 | // we've checked versions of gdb up to and including 6.7.1. | |
105 | ||
106 | static const char* gdb_sections[] = | |
107 | { ".debug_abbrev", | |
108 | // ".debug_aranges", // not used by gdb as of 6.7.1 | |
109 | ".debug_frame", | |
110 | ".debug_info", | |
111 | ".debug_line", | |
112 | ".debug_loc", | |
113 | ".debug_macinfo", | |
114 | // ".debug_pubnames", // not used by gdb as of 6.7.1 | |
115 | ".debug_ranges", | |
116 | ".debug_str", | |
117 | }; | |
118 | ||
119 | static inline bool | |
120 | is_gdb_debug_section(const char* str) | |
121 | { | |
122 | // We can do this faster: binary search or a hashtable. But why bother? | |
123 | for (size_t i = 0; i < sizeof(gdb_sections)/sizeof(*gdb_sections); ++i) | |
124 | if (strcmp(str, gdb_sections[i]) == 0) | |
125 | return true; | |
126 | return false; | |
127 | } | |
128 | ||
a2fb1b05 ILT |
129 | // Whether to include this section in the link. |
130 | ||
131 | template<int size, bool big_endian> | |
132 | bool | |
730cdc88 | 133 | Layout::include_section(Sized_relobj<size, big_endian>*, const char* name, |
a2fb1b05 ILT |
134 | const elfcpp::Shdr<size, big_endian>& shdr) |
135 | { | |
136 | // Some section types are never linked. Some are only linked when | |
137 | // doing a relocateable link. | |
138 | switch (shdr.get_sh_type()) | |
139 | { | |
140 | case elfcpp::SHT_NULL: | |
141 | case elfcpp::SHT_SYMTAB: | |
142 | case elfcpp::SHT_DYNSYM: | |
143 | case elfcpp::SHT_STRTAB: | |
144 | case elfcpp::SHT_HASH: | |
145 | case elfcpp::SHT_DYNAMIC: | |
146 | case elfcpp::SHT_SYMTAB_SHNDX: | |
147 | return false; | |
148 | ||
149 | case elfcpp::SHT_RELA: | |
150 | case elfcpp::SHT_REL: | |
151 | case elfcpp::SHT_GROUP: | |
7e1edb90 | 152 | return parameters->output_is_object(); |
a2fb1b05 | 153 | |
9e2dcb77 ILT |
154 | case elfcpp::SHT_PROGBITS: |
155 | if (parameters->strip_debug() | |
156 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
157 | { | |
158 | // Debugging sections can only be recognized by name. | |
159 | if (is_prefix_of(".debug", name) | |
160 | || is_prefix_of(".gnu.linkonce.wi.", name) | |
161 | || is_prefix_of(".line", name) | |
162 | || is_prefix_of(".stab", name)) | |
163 | return false; | |
164 | } | |
02d2ba74 ILT |
165 | if (parameters->strip_debug_gdb() |
166 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
167 | { | |
168 | // Debugging sections can only be recognized by name. | |
169 | if (is_prefix_of(".debug", name) | |
170 | && !is_gdb_debug_section(name)) | |
171 | return false; | |
172 | } | |
9e2dcb77 ILT |
173 | return true; |
174 | ||
a2fb1b05 | 175 | default: |
a2fb1b05 ILT |
176 | return true; |
177 | } | |
178 | } | |
179 | ||
ead1e424 | 180 | // Return an output section named NAME, or NULL if there is none. |
a2fb1b05 | 181 | |
a2fb1b05 | 182 | Output_section* |
ead1e424 | 183 | Layout::find_output_section(const char* name) const |
a2fb1b05 | 184 | { |
ead1e424 ILT |
185 | for (Section_name_map::const_iterator p = this->section_name_map_.begin(); |
186 | p != this->section_name_map_.end(); | |
187 | ++p) | |
f0641a0b | 188 | if (strcmp(p->second->name(), name) == 0) |
ead1e424 ILT |
189 | return p->second; |
190 | return NULL; | |
191 | } | |
a2fb1b05 | 192 | |
ead1e424 ILT |
193 | // Return an output segment of type TYPE, with segment flags SET set |
194 | // and segment flags CLEAR clear. Return NULL if there is none. | |
a2fb1b05 | 195 | |
ead1e424 ILT |
196 | Output_segment* |
197 | Layout::find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set, | |
198 | elfcpp::Elf_Word clear) const | |
199 | { | |
200 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
201 | p != this->segment_list_.end(); | |
202 | ++p) | |
203 | if (static_cast<elfcpp::PT>((*p)->type()) == type | |
204 | && ((*p)->flags() & set) == set | |
205 | && ((*p)->flags() & clear) == 0) | |
206 | return *p; | |
207 | return NULL; | |
208 | } | |
a2fb1b05 | 209 | |
ead1e424 ILT |
210 | // Return the output section to use for section NAME with type TYPE |
211 | // and section flags FLAGS. | |
a2fb1b05 | 212 | |
ead1e424 | 213 | Output_section* |
f0641a0b ILT |
214 | Layout::get_output_section(const char* name, Stringpool::Key name_key, |
215 | elfcpp::Elf_Word type, elfcpp::Elf_Xword flags) | |
ead1e424 ILT |
216 | { |
217 | // We should ignore some flags. | |
218 | flags &= ~ (elfcpp::SHF_INFO_LINK | |
219 | | elfcpp::SHF_LINK_ORDER | |
b8e6aad9 ILT |
220 | | elfcpp::SHF_GROUP |
221 | | elfcpp::SHF_MERGE | |
222 | | elfcpp::SHF_STRINGS); | |
a2fb1b05 | 223 | |
f0641a0b | 224 | const Key key(name_key, std::make_pair(type, flags)); |
a2fb1b05 ILT |
225 | const std::pair<Key, Output_section*> v(key, NULL); |
226 | std::pair<Section_name_map::iterator, bool> ins( | |
227 | this->section_name_map_.insert(v)); | |
228 | ||
a2fb1b05 | 229 | if (!ins.second) |
ead1e424 | 230 | return ins.first->second; |
a2fb1b05 ILT |
231 | else |
232 | { | |
233 | // This is the first time we've seen this name/type/flags | |
234 | // combination. | |
ead1e424 | 235 | Output_section* os = this->make_output_section(name, type, flags); |
a2fb1b05 | 236 | ins.first->second = os; |
ead1e424 | 237 | return os; |
a2fb1b05 | 238 | } |
ead1e424 ILT |
239 | } |
240 | ||
241 | // Return the output section to use for input section SHNDX, with name | |
730cdc88 ILT |
242 | // NAME, with header HEADER, from object OBJECT. RELOC_SHNDX is the |
243 | // index of a relocation section which applies to this section, or 0 | |
244 | // if none, or -1U if more than one. RELOC_TYPE is the type of the | |
245 | // relocation section if there is one. Set *OFF to the offset of this | |
246 | // input section without the output section. Return NULL if the | |
247 | // section should be discarded. Set *OFF to -1 if the section | |
248 | // contents should not be written directly to the output file, but | |
249 | // will instead receive special handling. | |
ead1e424 ILT |
250 | |
251 | template<int size, bool big_endian> | |
252 | Output_section* | |
730cdc88 ILT |
253 | Layout::layout(Sized_relobj<size, big_endian>* object, unsigned int shndx, |
254 | const char* name, const elfcpp::Shdr<size, big_endian>& shdr, | |
255 | unsigned int reloc_shndx, unsigned int, off_t* off) | |
ead1e424 ILT |
256 | { |
257 | if (!this->include_section(object, name, shdr)) | |
258 | return NULL; | |
259 | ||
260 | // If we are not doing a relocateable link, choose the name to use | |
261 | // for the output section. | |
262 | size_t len = strlen(name); | |
7e1edb90 | 263 | if (!parameters->output_is_object()) |
ead1e424 ILT |
264 | name = Layout::output_section_name(name, &len); |
265 | ||
266 | // FIXME: Handle SHF_OS_NONCONFORMING here. | |
267 | ||
268 | // Canonicalize the section name. | |
f0641a0b | 269 | Stringpool::Key name_key; |
cfd73a4e | 270 | name = this->namepool_.add_prefix(name, len, &name_key); |
ead1e424 ILT |
271 | |
272 | // Find the output section. The output section is selected based on | |
273 | // the section name, type, and flags. | |
f0641a0b ILT |
274 | Output_section* os = this->get_output_section(name, name_key, |
275 | shdr.get_sh_type(), | |
ead1e424 | 276 | shdr.get_sh_flags()); |
a2fb1b05 ILT |
277 | |
278 | // FIXME: Handle SHF_LINK_ORDER somewhere. | |
279 | ||
730cdc88 | 280 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx); |
a2fb1b05 ILT |
281 | |
282 | return os; | |
283 | } | |
284 | ||
730cdc88 ILT |
285 | // Special GNU handling of sections name .eh_frame. They will |
286 | // normally hold exception frame data as defined by the C++ ABI | |
287 | // (http://codesourcery.com/cxx-abi/). | |
3151305a ILT |
288 | |
289 | template<int size, bool big_endian> | |
730cdc88 ILT |
290 | Output_section* |
291 | Layout::layout_eh_frame(Sized_relobj<size, big_endian>* object, | |
292 | const unsigned char* symbols, | |
293 | off_t symbols_size, | |
294 | const unsigned char* symbol_names, | |
295 | off_t symbol_names_size, | |
3151305a | 296 | unsigned int shndx, |
3151305a | 297 | const elfcpp::Shdr<size, big_endian>& shdr, |
730cdc88 ILT |
298 | unsigned int reloc_shndx, unsigned int reloc_type, |
299 | off_t* off) | |
3151305a | 300 | { |
730cdc88 ILT |
301 | gold_assert(shdr.get_sh_type() == elfcpp::SHT_PROGBITS); |
302 | gold_assert(shdr.get_sh_flags() == elfcpp::SHF_ALLOC); | |
303 | ||
304 | Stringpool::Key name_key; | |
305 | const char* name = this->namepool_.add(".eh_frame", false, &name_key); | |
306 | ||
307 | Output_section* os = this->get_output_section(name, name_key, | |
308 | elfcpp::SHT_PROGBITS, | |
309 | elfcpp::SHF_ALLOC); | |
310 | ||
3151305a ILT |
311 | if (this->eh_frame_section_ == NULL) |
312 | { | |
313 | this->eh_frame_section_ = os; | |
730cdc88 ILT |
314 | this->eh_frame_data_ = new Eh_frame(); |
315 | os->add_output_section_data(this->eh_frame_data_); | |
3151305a ILT |
316 | |
317 | if (this->options_.create_eh_frame_hdr()) | |
318 | { | |
319 | Stringpool::Key hdr_name_key; | |
320 | const char* hdr_name = this->namepool_.add(".eh_frame_hdr", | |
cfd73a4e | 321 | false, |
3151305a ILT |
322 | &hdr_name_key); |
323 | Output_section* hdr_os = | |
324 | this->get_output_section(hdr_name, hdr_name_key, | |
325 | elfcpp::SHT_PROGBITS, | |
326 | elfcpp::SHF_ALLOC); | |
327 | ||
730cdc88 | 328 | Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(os, this->eh_frame_data_); |
3151305a ILT |
329 | hdr_os->add_output_section_data(hdr_posd); |
330 | ||
730cdc88 ILT |
331 | hdr_os->set_after_input_sections(); |
332 | ||
3151305a ILT |
333 | Output_segment* hdr_oseg = |
334 | new Output_segment(elfcpp::PT_GNU_EH_FRAME, elfcpp::PF_R); | |
335 | this->segment_list_.push_back(hdr_oseg); | |
336 | hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R); | |
730cdc88 ILT |
337 | |
338 | this->eh_frame_data_->set_eh_frame_hdr(hdr_posd); | |
3151305a ILT |
339 | } |
340 | } | |
341 | ||
342 | gold_assert(this->eh_frame_section_ == os); | |
343 | ||
730cdc88 ILT |
344 | if (this->eh_frame_data_->add_ehframe_input_section(object, |
345 | symbols, | |
346 | symbols_size, | |
347 | symbol_names, | |
348 | symbol_names_size, | |
349 | shndx, | |
350 | reloc_shndx, | |
351 | reloc_type)) | |
352 | *off = -1; | |
353 | else | |
354 | { | |
355 | // We couldn't handle this .eh_frame section for some reason. | |
356 | // Add it as a normal section. | |
357 | *off = os->add_input_section(object, shndx, name, shdr, reloc_shndx); | |
358 | } | |
359 | ||
360 | return os; | |
3151305a ILT |
361 | } |
362 | ||
ead1e424 ILT |
363 | // Add POSD to an output section using NAME, TYPE, and FLAGS. |
364 | ||
365 | void | |
366 | Layout::add_output_section_data(const char* name, elfcpp::Elf_Word type, | |
367 | elfcpp::Elf_Xword flags, | |
368 | Output_section_data* posd) | |
369 | { | |
370 | // Canonicalize the name. | |
f0641a0b | 371 | Stringpool::Key name_key; |
cfd73a4e | 372 | name = this->namepool_.add(name, true, &name_key); |
ead1e424 | 373 | |
f0641a0b | 374 | Output_section* os = this->get_output_section(name, name_key, type, flags); |
ead1e424 ILT |
375 | os->add_output_section_data(posd); |
376 | } | |
377 | ||
a2fb1b05 ILT |
378 | // Map section flags to segment flags. |
379 | ||
380 | elfcpp::Elf_Word | |
381 | Layout::section_flags_to_segment(elfcpp::Elf_Xword flags) | |
382 | { | |
383 | elfcpp::Elf_Word ret = elfcpp::PF_R; | |
384 | if ((flags & elfcpp::SHF_WRITE) != 0) | |
385 | ret |= elfcpp::PF_W; | |
386 | if ((flags & elfcpp::SHF_EXECINSTR) != 0) | |
387 | ret |= elfcpp::PF_X; | |
388 | return ret; | |
389 | } | |
390 | ||
96803768 ILT |
391 | // Sometimes we compress sections. This is typically done for |
392 | // sections that are not part of normal program execution (such as | |
393 | // .debug_* sections), and where the readers of these sections know | |
394 | // how to deal with compressed sections. (To make it easier for them, | |
395 | // we will rename the ouput section in such cases from .foo to | |
396 | // .foo.zlib.nnnn, where nnnn is the uncompressed size.) This routine | |
397 | // doesn't say for certain whether we'll compress -- it depends on | |
398 | // commandline options as well -- just whether this section is a | |
399 | // candidate for compression. | |
400 | ||
401 | static bool | |
402 | is_compressible_debug_section(const char* secname) | |
403 | { | |
404 | return (strncmp(secname, ".debug", sizeof(".debug") - 1) == 0); | |
405 | } | |
406 | ||
a2fb1b05 ILT |
407 | // Make a new Output_section, and attach it to segments as |
408 | // appropriate. | |
409 | ||
410 | Output_section* | |
411 | Layout::make_output_section(const char* name, elfcpp::Elf_Word type, | |
412 | elfcpp::Elf_Xword flags) | |
413 | { | |
96803768 ILT |
414 | Output_section* os; |
415 | if ((flags & elfcpp::SHF_ALLOC) == 0 | |
416 | && this->options_.compress_debug_sections() | |
417 | && is_compressible_debug_section(name)) | |
418 | os = new Output_compressed_section(&this->options_, name, type, flags); | |
419 | else | |
420 | os = new Output_section(name, type, flags); | |
421 | ||
a3ad94ed | 422 | this->section_list_.push_back(os); |
a2fb1b05 ILT |
423 | |
424 | if ((flags & elfcpp::SHF_ALLOC) == 0) | |
a3ad94ed | 425 | this->unattached_section_list_.push_back(os); |
a2fb1b05 ILT |
426 | else |
427 | { | |
428 | // This output section goes into a PT_LOAD segment. | |
429 | ||
430 | elfcpp::Elf_Word seg_flags = Layout::section_flags_to_segment(flags); | |
431 | ||
432 | // The only thing we really care about for PT_LOAD segments is | |
433 | // whether or not they are writable, so that is how we search | |
434 | // for them. People who need segments sorted on some other | |
435 | // basis will have to wait until we implement a mechanism for | |
436 | // them to describe the segments they want. | |
437 | ||
438 | Segment_list::const_iterator p; | |
439 | for (p = this->segment_list_.begin(); | |
440 | p != this->segment_list_.end(); | |
441 | ++p) | |
442 | { | |
443 | if ((*p)->type() == elfcpp::PT_LOAD | |
444 | && ((*p)->flags() & elfcpp::PF_W) == (seg_flags & elfcpp::PF_W)) | |
445 | { | |
75f65a3e | 446 | (*p)->add_output_section(os, seg_flags); |
a2fb1b05 ILT |
447 | break; |
448 | } | |
449 | } | |
450 | ||
451 | if (p == this->segment_list_.end()) | |
452 | { | |
453 | Output_segment* oseg = new Output_segment(elfcpp::PT_LOAD, | |
454 | seg_flags); | |
455 | this->segment_list_.push_back(oseg); | |
75f65a3e | 456 | oseg->add_output_section(os, seg_flags); |
a2fb1b05 ILT |
457 | } |
458 | ||
459 | // If we see a loadable SHT_NOTE section, we create a PT_NOTE | |
460 | // segment. | |
461 | if (type == elfcpp::SHT_NOTE) | |
462 | { | |
463 | // See if we already have an equivalent PT_NOTE segment. | |
464 | for (p = this->segment_list_.begin(); | |
465 | p != segment_list_.end(); | |
466 | ++p) | |
467 | { | |
468 | if ((*p)->type() == elfcpp::PT_NOTE | |
469 | && (((*p)->flags() & elfcpp::PF_W) | |
470 | == (seg_flags & elfcpp::PF_W))) | |
471 | { | |
75f65a3e | 472 | (*p)->add_output_section(os, seg_flags); |
a2fb1b05 ILT |
473 | break; |
474 | } | |
475 | } | |
476 | ||
477 | if (p == this->segment_list_.end()) | |
478 | { | |
479 | Output_segment* oseg = new Output_segment(elfcpp::PT_NOTE, | |
480 | seg_flags); | |
481 | this->segment_list_.push_back(oseg); | |
75f65a3e | 482 | oseg->add_output_section(os, seg_flags); |
a2fb1b05 ILT |
483 | } |
484 | } | |
54dc6425 ILT |
485 | |
486 | // If we see a loadable SHF_TLS section, we create a PT_TLS | |
92e059d8 | 487 | // segment. There can only be one such segment. |
54dc6425 ILT |
488 | if ((flags & elfcpp::SHF_TLS) != 0) |
489 | { | |
92e059d8 | 490 | if (this->tls_segment_ == NULL) |
54dc6425 | 491 | { |
92e059d8 ILT |
492 | this->tls_segment_ = new Output_segment(elfcpp::PT_TLS, |
493 | seg_flags); | |
494 | this->segment_list_.push_back(this->tls_segment_); | |
54dc6425 | 495 | } |
92e059d8 | 496 | this->tls_segment_->add_output_section(os, seg_flags); |
54dc6425 | 497 | } |
a2fb1b05 ILT |
498 | } |
499 | ||
500 | return os; | |
501 | } | |
502 | ||
35cdfc9a ILT |
503 | // Handle the .note.GNU-stack section at layout time. SEEN_GNU_STACK |
504 | // is whether we saw a .note.GNU-stack section in the object file. | |
505 | // GNU_STACK_FLAGS is the section flags. The flags give the | |
506 | // protection required for stack memory. We record this in an | |
507 | // executable as a PT_GNU_STACK segment. If an object file does not | |
508 | // have a .note.GNU-stack segment, we must assume that it is an old | |
509 | // object. On some targets that will force an executable stack. | |
510 | ||
511 | void | |
512 | Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags) | |
513 | { | |
514 | if (!seen_gnu_stack) | |
515 | this->input_without_gnu_stack_note_ = true; | |
516 | else | |
517 | { | |
518 | this->input_with_gnu_stack_note_ = true; | |
519 | if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0) | |
520 | this->input_requires_executable_stack_ = true; | |
521 | } | |
522 | } | |
523 | ||
a3ad94ed ILT |
524 | // Create the dynamic sections which are needed before we read the |
525 | // relocs. | |
526 | ||
527 | void | |
528 | Layout::create_initial_dynamic_sections(const Input_objects* input_objects, | |
529 | Symbol_table* symtab) | |
530 | { | |
436ca963 | 531 | if (parameters->doing_static_link()) |
a3ad94ed ILT |
532 | return; |
533 | ||
cfd73a4e | 534 | const char* dynamic_name = this->namepool_.add(".dynamic", false, NULL); |
a3ad94ed ILT |
535 | this->dynamic_section_ = this->make_output_section(dynamic_name, |
536 | elfcpp::SHT_DYNAMIC, | |
537 | (elfcpp::SHF_ALLOC | |
538 | | elfcpp::SHF_WRITE)); | |
539 | ||
14b31740 | 540 | symtab->define_in_output_data(input_objects->target(), "_DYNAMIC", NULL, |
a3ad94ed ILT |
541 | this->dynamic_section_, 0, 0, |
542 | elfcpp::STT_OBJECT, elfcpp::STB_LOCAL, | |
543 | elfcpp::STV_HIDDEN, 0, false, false); | |
16649710 | 544 | |
9025d29d | 545 | this->dynamic_data_ = new Output_data_dynamic(&this->dynpool_); |
16649710 ILT |
546 | |
547 | this->dynamic_section_->add_output_section_data(this->dynamic_data_); | |
a3ad94ed ILT |
548 | } |
549 | ||
bfd58944 ILT |
550 | // For each output section whose name can be represented as C symbol, |
551 | // define __start and __stop symbols for the section. This is a GNU | |
552 | // extension. | |
553 | ||
554 | void | |
555 | Layout::define_section_symbols(Symbol_table* symtab, const Target* target) | |
556 | { | |
557 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
558 | p != this->section_list_.end(); | |
559 | ++p) | |
560 | { | |
561 | const char* const name = (*p)->name(); | |
562 | if (name[strspn(name, | |
563 | ("0123456789" | |
564 | "ABCDEFGHIJKLMNOPWRSTUVWXYZ" | |
565 | "abcdefghijklmnopqrstuvwxyz" | |
566 | "_"))] | |
567 | == '\0') | |
568 | { | |
569 | const std::string name_string(name); | |
570 | const std::string start_name("__start_" + name_string); | |
571 | const std::string stop_name("__stop_" + name_string); | |
572 | ||
573 | symtab->define_in_output_data(target, | |
574 | start_name.c_str(), | |
575 | NULL, // version | |
576 | *p, | |
577 | 0, // value | |
578 | 0, // symsize | |
579 | elfcpp::STT_NOTYPE, | |
580 | elfcpp::STB_GLOBAL, | |
581 | elfcpp::STV_DEFAULT, | |
582 | 0, // nonvis | |
583 | false, // offset_is_from_end | |
584 | false); // only_if_ref | |
585 | ||
586 | symtab->define_in_output_data(target, | |
587 | stop_name.c_str(), | |
588 | NULL, // version | |
589 | *p, | |
590 | 0, // value | |
591 | 0, // symsize | |
592 | elfcpp::STT_NOTYPE, | |
593 | elfcpp::STB_GLOBAL, | |
594 | elfcpp::STV_DEFAULT, | |
595 | 0, // nonvis | |
596 | true, // offset_is_from_end | |
597 | false); // only_if_ref | |
598 | } | |
599 | } | |
600 | } | |
601 | ||
75f65a3e ILT |
602 | // Find the first read-only PT_LOAD segment, creating one if |
603 | // necessary. | |
54dc6425 | 604 | |
75f65a3e ILT |
605 | Output_segment* |
606 | Layout::find_first_load_seg() | |
54dc6425 | 607 | { |
75f65a3e ILT |
608 | for (Segment_list::const_iterator p = this->segment_list_.begin(); |
609 | p != this->segment_list_.end(); | |
610 | ++p) | |
611 | { | |
612 | if ((*p)->type() == elfcpp::PT_LOAD | |
613 | && ((*p)->flags() & elfcpp::PF_R) != 0 | |
614 | && ((*p)->flags() & elfcpp::PF_W) == 0) | |
615 | return *p; | |
616 | } | |
617 | ||
618 | Output_segment* load_seg = new Output_segment(elfcpp::PT_LOAD, elfcpp::PF_R); | |
619 | this->segment_list_.push_back(load_seg); | |
620 | return load_seg; | |
54dc6425 ILT |
621 | } |
622 | ||
623 | // Finalize the layout. When this is called, we have created all the | |
624 | // output sections and all the output segments which are based on | |
625 | // input sections. We have several things to do, and we have to do | |
626 | // them in the right order, so that we get the right results correctly | |
627 | // and efficiently. | |
628 | ||
629 | // 1) Finalize the list of output segments and create the segment | |
630 | // table header. | |
631 | ||
632 | // 2) Finalize the dynamic symbol table and associated sections. | |
633 | ||
634 | // 3) Determine the final file offset of all the output segments. | |
635 | ||
636 | // 4) Determine the final file offset of all the SHF_ALLOC output | |
637 | // sections. | |
638 | ||
75f65a3e ILT |
639 | // 5) Create the symbol table sections and the section name table |
640 | // section. | |
641 | ||
642 | // 6) Finalize the symbol table: set symbol values to their final | |
54dc6425 ILT |
643 | // value and make a final determination of which symbols are going |
644 | // into the output symbol table. | |
645 | ||
54dc6425 ILT |
646 | // 7) Create the section table header. |
647 | ||
648 | // 8) Determine the final file offset of all the output sections which | |
649 | // are not SHF_ALLOC, including the section table header. | |
650 | ||
651 | // 9) Finalize the ELF file header. | |
652 | ||
75f65a3e ILT |
653 | // This function returns the size of the output file. |
654 | ||
655 | off_t | |
656 | Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab) | |
54dc6425 | 657 | { |
5a6f7e2d | 658 | Target* const target = input_objects->target(); |
dbe717ef | 659 | |
7e1edb90 | 660 | target->finalize_sections(this); |
5a6f7e2d | 661 | |
7bf1f802 ILT |
662 | this->count_local_symbols(input_objects); |
663 | ||
35cdfc9a ILT |
664 | this->create_gold_note(); |
665 | this->create_executable_stack_info(target); | |
4f211c8b | 666 | |
dbe717ef | 667 | Output_segment* phdr_seg = NULL; |
436ca963 | 668 | if (!parameters->doing_static_link()) |
54dc6425 | 669 | { |
dbe717ef ILT |
670 | // There was a dynamic object in the link. We need to create |
671 | // some information for the dynamic linker. | |
672 | ||
673 | // Create the PT_PHDR segment which will hold the program | |
674 | // headers. | |
675 | phdr_seg = new Output_segment(elfcpp::PT_PHDR, elfcpp::PF_R); | |
676 | this->segment_list_.push_back(phdr_seg); | |
677 | ||
14b31740 ILT |
678 | // Create the dynamic symbol table, including the hash table. |
679 | Output_section* dynstr; | |
680 | std::vector<Symbol*> dynamic_symbols; | |
681 | unsigned int local_dynamic_count; | |
682 | Versions versions; | |
7bf1f802 | 683 | this->create_dynamic_symtab(input_objects, target, symtab, &dynstr, |
14b31740 ILT |
684 | &local_dynamic_count, &dynamic_symbols, |
685 | &versions); | |
dbe717ef ILT |
686 | |
687 | // Create the .interp section to hold the name of the | |
688 | // interpreter, and put it in a PT_INTERP segment. | |
96f2030e ILT |
689 | if (!parameters->output_is_shared()) |
690 | this->create_interp(target); | |
a3ad94ed ILT |
691 | |
692 | // Finish the .dynamic section to hold the dynamic data, and put | |
693 | // it in a PT_DYNAMIC segment. | |
16649710 | 694 | this->finish_dynamic_section(input_objects, symtab); |
14b31740 ILT |
695 | |
696 | // We should have added everything we need to the dynamic string | |
697 | // table. | |
698 | this->dynpool_.set_string_offsets(); | |
699 | ||
700 | // Create the version sections. We can't do this until the | |
701 | // dynamic string table is complete. | |
46fe1623 | 702 | this->create_version_sections(&versions, symtab, local_dynamic_count, |
14b31740 | 703 | dynamic_symbols, dynstr); |
54dc6425 ILT |
704 | } |
705 | ||
706 | // FIXME: Handle PT_GNU_STACK. | |
707 | ||
75f65a3e ILT |
708 | Output_segment* load_seg = this->find_first_load_seg(); |
709 | ||
710 | // Lay out the segment headers. | |
75f65a3e | 711 | Output_segment_headers* segment_headers; |
9025d29d | 712 | segment_headers = new Output_segment_headers(this->segment_list_); |
75f65a3e | 713 | load_seg->add_initial_output_data(segment_headers); |
61ba1cf9 | 714 | this->special_output_list_.push_back(segment_headers); |
dbe717ef ILT |
715 | if (phdr_seg != NULL) |
716 | phdr_seg->add_initial_output_data(segment_headers); | |
75f65a3e ILT |
717 | |
718 | // Lay out the file header. | |
719 | Output_file_header* file_header; | |
9025d29d | 720 | file_header = new Output_file_header(target, symtab, segment_headers); |
75f65a3e | 721 | load_seg->add_initial_output_data(file_header); |
61ba1cf9 | 722 | this->special_output_list_.push_back(file_header); |
75f65a3e | 723 | |
ead1e424 | 724 | // We set the output section indexes in set_segment_offsets and |
27bc2bce | 725 | // set_section_indexes. |
ead1e424 ILT |
726 | unsigned int shndx = 1; |
727 | ||
728 | // Set the file offsets of all the segments, and all the sections | |
729 | // they contain. | |
a3ad94ed | 730 | off_t off = this->set_segment_offsets(target, load_seg, &shndx); |
75f65a3e ILT |
731 | |
732 | // Create the symbol table sections. | |
9025d29d | 733 | this->create_symtab_sections(input_objects, symtab, &off); |
7bf1f802 ILT |
734 | if (!parameters->doing_static_link()) |
735 | this->assign_local_dynsym_offsets(input_objects); | |
75f65a3e ILT |
736 | |
737 | // Create the .shstrtab section. | |
738 | Output_section* shstrtab_section = this->create_shstrtab(); | |
739 | ||
27bc2bce ILT |
740 | // Set the file offsets of all the non-data sections which don't |
741 | // have to wait for the input sections. | |
9a0910c3 | 742 | off = this->set_section_offsets(off, BEFORE_INPUT_SECTIONS_PASS); |
86887060 ILT |
743 | |
744 | // Now that all sections have been created, set the section indexes. | |
745 | shndx = this->set_section_indexes(shndx); | |
ead1e424 | 746 | |
75f65a3e | 747 | // Create the section table header. |
27bc2bce | 748 | this->create_shdrs(&off); |
75f65a3e | 749 | |
27bc2bce | 750 | file_header->set_section_info(this->section_headers_, shstrtab_section); |
75f65a3e | 751 | |
27bc2bce ILT |
752 | // Now we know exactly where everything goes in the output file |
753 | // (except for non-allocated sections which require postprocessing). | |
a3ad94ed | 754 | Output_data::layout_complete(); |
75f65a3e | 755 | |
e44fcf3b ILT |
756 | this->output_file_size_ = off; |
757 | ||
75f65a3e ILT |
758 | return off; |
759 | } | |
760 | ||
4f211c8b ILT |
761 | // Create a .note section for an executable or shared library. This |
762 | // records the version of gold used to create the binary. | |
763 | ||
764 | void | |
35cdfc9a | 765 | Layout::create_gold_note() |
4f211c8b ILT |
766 | { |
767 | if (parameters->output_is_object()) | |
768 | return; | |
769 | ||
e2305dc0 ILT |
770 | // Authorities all agree that the values in a .note field should |
771 | // be aligned on 4-byte boundaries for 32-bit binaries. However, | |
772 | // they differ on what the alignment is for 64-bit binaries. | |
773 | // The GABI says unambiguously they take 8-byte alignment: | |
774 | // http://sco.com/developers/gabi/latest/ch5.pheader.html#note_section | |
775 | // Other documentation says alignment should always be 4 bytes: | |
776 | // http://www.netbsd.org/docs/kernel/elf-notes.html#note-format | |
777 | // GNU ld and GNU readelf both support the latter (at least as of | |
778 | // version 2.16.91), and glibc always generates the latter for | |
779 | // .note.ABI-tag (as of version 1.6), so that's the one we go with | |
780 | // here. | |
35cdfc9a | 781 | #ifdef GABI_FORMAT_FOR_DOTNOTE_SECTION // This is not defined by default. |
4f211c8b | 782 | const int size = parameters->get_size(); |
e2305dc0 ILT |
783 | #else |
784 | const int size = 32; | |
785 | #endif | |
4f211c8b ILT |
786 | |
787 | // The contents of the .note section. | |
788 | const char* name = "GNU"; | |
789 | std::string desc(std::string("gold ") + gold::get_version_string()); | |
790 | size_t namesz = strlen(name) + 1; | |
791 | size_t aligned_namesz = align_address(namesz, size / 8); | |
792 | size_t descsz = desc.length() + 1; | |
793 | size_t aligned_descsz = align_address(descsz, size / 8); | |
794 | const int note_type = 4; | |
795 | ||
796 | size_t notesz = 3 * (size / 8) + aligned_namesz + aligned_descsz; | |
797 | ||
798 | unsigned char buffer[128]; | |
799 | gold_assert(sizeof buffer >= notesz); | |
800 | memset(buffer, 0, notesz); | |
801 | ||
802 | bool is_big_endian = parameters->is_big_endian(); | |
803 | ||
804 | if (size == 32) | |
805 | { | |
806 | if (!is_big_endian) | |
807 | { | |
808 | elfcpp::Swap<32, false>::writeval(buffer, namesz); | |
809 | elfcpp::Swap<32, false>::writeval(buffer + 4, descsz); | |
810 | elfcpp::Swap<32, false>::writeval(buffer + 8, note_type); | |
811 | } | |
812 | else | |
813 | { | |
814 | elfcpp::Swap<32, true>::writeval(buffer, namesz); | |
815 | elfcpp::Swap<32, true>::writeval(buffer + 4, descsz); | |
816 | elfcpp::Swap<32, true>::writeval(buffer + 8, note_type); | |
817 | } | |
818 | } | |
819 | else if (size == 64) | |
820 | { | |
821 | if (!is_big_endian) | |
822 | { | |
823 | elfcpp::Swap<64, false>::writeval(buffer, namesz); | |
824 | elfcpp::Swap<64, false>::writeval(buffer + 8, descsz); | |
825 | elfcpp::Swap<64, false>::writeval(buffer + 16, note_type); | |
826 | } | |
827 | else | |
828 | { | |
829 | elfcpp::Swap<64, true>::writeval(buffer, namesz); | |
830 | elfcpp::Swap<64, true>::writeval(buffer + 8, descsz); | |
831 | elfcpp::Swap<64, true>::writeval(buffer + 16, note_type); | |
832 | } | |
833 | } | |
834 | else | |
835 | gold_unreachable(); | |
836 | ||
837 | memcpy(buffer + 3 * (size / 8), name, namesz); | |
838 | memcpy(buffer + 3 * (size / 8) + aligned_namesz, desc.data(), descsz); | |
839 | ||
cfd73a4e | 840 | const char* note_name = this->namepool_.add(".note", false, NULL); |
4f211c8b ILT |
841 | Output_section* os = this->make_output_section(note_name, |
842 | elfcpp::SHT_NOTE, | |
843 | 0); | |
844 | Output_section_data* posd = new Output_data_const(buffer, notesz, | |
845 | size / 8); | |
846 | os->add_output_section_data(posd); | |
847 | } | |
848 | ||
35cdfc9a ILT |
849 | // Record whether the stack should be executable. This can be set |
850 | // from the command line using the -z execstack or -z noexecstack | |
851 | // options. Otherwise, if any input file has a .note.GNU-stack | |
852 | // section with the SHF_EXECINSTR flag set, the stack should be | |
853 | // executable. Otherwise, if at least one input file a | |
854 | // .note.GNU-stack section, and some input file has no .note.GNU-stack | |
855 | // section, we use the target default for whether the stack should be | |
856 | // executable. Otherwise, we don't generate a stack note. When | |
857 | // generating a object file, we create a .note.GNU-stack section with | |
858 | // the appropriate marking. When generating an executable or shared | |
859 | // library, we create a PT_GNU_STACK segment. | |
860 | ||
861 | void | |
862 | Layout::create_executable_stack_info(const Target* target) | |
863 | { | |
864 | bool is_stack_executable; | |
865 | if (this->options_.is_execstack_set()) | |
866 | is_stack_executable = this->options_.is_stack_executable(); | |
867 | else if (!this->input_with_gnu_stack_note_) | |
868 | return; | |
869 | else | |
870 | { | |
871 | if (this->input_requires_executable_stack_) | |
872 | is_stack_executable = true; | |
873 | else if (this->input_without_gnu_stack_note_) | |
874 | is_stack_executable = target->is_default_stack_executable(); | |
875 | else | |
876 | is_stack_executable = false; | |
877 | } | |
878 | ||
879 | if (parameters->output_is_object()) | |
880 | { | |
881 | const char* name = this->namepool_.add(".note.GNU-stack", false, NULL); | |
882 | elfcpp::Elf_Xword flags = 0; | |
883 | if (is_stack_executable) | |
884 | flags |= elfcpp::SHF_EXECINSTR; | |
885 | this->make_output_section(name, elfcpp::SHT_PROGBITS, flags); | |
886 | } | |
887 | else | |
888 | { | |
889 | int flags = elfcpp::PF_R | elfcpp::PF_W; | |
890 | if (is_stack_executable) | |
891 | flags |= elfcpp::PF_X; | |
892 | Output_segment* oseg = new Output_segment(elfcpp::PT_GNU_STACK, flags); | |
893 | this->segment_list_.push_back(oseg); | |
894 | } | |
895 | } | |
896 | ||
75f65a3e ILT |
897 | // Return whether SEG1 should be before SEG2 in the output file. This |
898 | // is based entirely on the segment type and flags. When this is | |
899 | // called the segment addresses has normally not yet been set. | |
900 | ||
901 | bool | |
902 | Layout::segment_precedes(const Output_segment* seg1, | |
903 | const Output_segment* seg2) | |
904 | { | |
905 | elfcpp::Elf_Word type1 = seg1->type(); | |
906 | elfcpp::Elf_Word type2 = seg2->type(); | |
907 | ||
908 | // The single PT_PHDR segment is required to precede any loadable | |
909 | // segment. We simply make it always first. | |
910 | if (type1 == elfcpp::PT_PHDR) | |
911 | { | |
a3ad94ed | 912 | gold_assert(type2 != elfcpp::PT_PHDR); |
75f65a3e ILT |
913 | return true; |
914 | } | |
915 | if (type2 == elfcpp::PT_PHDR) | |
916 | return false; | |
917 | ||
918 | // The single PT_INTERP segment is required to precede any loadable | |
919 | // segment. We simply make it always second. | |
920 | if (type1 == elfcpp::PT_INTERP) | |
921 | { | |
a3ad94ed | 922 | gold_assert(type2 != elfcpp::PT_INTERP); |
75f65a3e ILT |
923 | return true; |
924 | } | |
925 | if (type2 == elfcpp::PT_INTERP) | |
926 | return false; | |
927 | ||
928 | // We then put PT_LOAD segments before any other segments. | |
929 | if (type1 == elfcpp::PT_LOAD && type2 != elfcpp::PT_LOAD) | |
930 | return true; | |
931 | if (type2 == elfcpp::PT_LOAD && type1 != elfcpp::PT_LOAD) | |
932 | return false; | |
933 | ||
92e059d8 ILT |
934 | // We put the PT_TLS segment last, because that is where the dynamic |
935 | // linker expects to find it (this is just for efficiency; other | |
936 | // positions would also work correctly). | |
937 | if (type1 == elfcpp::PT_TLS && type2 != elfcpp::PT_TLS) | |
938 | return false; | |
939 | if (type2 == elfcpp::PT_TLS && type1 != elfcpp::PT_TLS) | |
940 | return true; | |
941 | ||
75f65a3e ILT |
942 | const elfcpp::Elf_Word flags1 = seg1->flags(); |
943 | const elfcpp::Elf_Word flags2 = seg2->flags(); | |
944 | ||
945 | // The order of non-PT_LOAD segments is unimportant. We simply sort | |
946 | // by the numeric segment type and flags values. There should not | |
947 | // be more than one segment with the same type and flags. | |
948 | if (type1 != elfcpp::PT_LOAD) | |
949 | { | |
950 | if (type1 != type2) | |
951 | return type1 < type2; | |
a3ad94ed | 952 | gold_assert(flags1 != flags2); |
75f65a3e ILT |
953 | return flags1 < flags2; |
954 | } | |
955 | ||
956 | // We sort PT_LOAD segments based on the flags. Readonly segments | |
957 | // come before writable segments. Then executable segments come | |
958 | // before non-executable segments. Then the unlikely case of a | |
959 | // non-readable segment comes before the normal case of a readable | |
960 | // segment. If there are multiple segments with the same type and | |
961 | // flags, we require that the address be set, and we sort by | |
962 | // virtual address and then physical address. | |
963 | if ((flags1 & elfcpp::PF_W) != (flags2 & elfcpp::PF_W)) | |
964 | return (flags1 & elfcpp::PF_W) == 0; | |
965 | if ((flags1 & elfcpp::PF_X) != (flags2 & elfcpp::PF_X)) | |
966 | return (flags1 & elfcpp::PF_X) != 0; | |
967 | if ((flags1 & elfcpp::PF_R) != (flags2 & elfcpp::PF_R)) | |
968 | return (flags1 & elfcpp::PF_R) == 0; | |
969 | ||
970 | uint64_t vaddr1 = seg1->vaddr(); | |
971 | uint64_t vaddr2 = seg2->vaddr(); | |
972 | if (vaddr1 != vaddr2) | |
973 | return vaddr1 < vaddr2; | |
974 | ||
975 | uint64_t paddr1 = seg1->paddr(); | |
976 | uint64_t paddr2 = seg2->paddr(); | |
a3ad94ed | 977 | gold_assert(paddr1 != paddr2); |
75f65a3e ILT |
978 | return paddr1 < paddr2; |
979 | } | |
980 | ||
ead1e424 ILT |
981 | // Set the file offsets of all the segments, and all the sections they |
982 | // contain. They have all been created. LOAD_SEG must be be laid out | |
983 | // first. Return the offset of the data to follow. | |
75f65a3e ILT |
984 | |
985 | off_t | |
ead1e424 ILT |
986 | Layout::set_segment_offsets(const Target* target, Output_segment* load_seg, |
987 | unsigned int *pshndx) | |
75f65a3e ILT |
988 | { |
989 | // Sort them into the final order. | |
54dc6425 ILT |
990 | std::sort(this->segment_list_.begin(), this->segment_list_.end(), |
991 | Layout::Compare_segments()); | |
992 | ||
75f65a3e ILT |
993 | // Find the PT_LOAD segments, and set their addresses and offsets |
994 | // and their section's addresses and offsets. | |
0c5e9c22 | 995 | uint64_t addr; |
4117d768 ILT |
996 | if (parameters->output_is_shared()) |
997 | addr = 0; | |
998 | else if (options_.user_set_text_segment_address()) | |
0c5e9c22 ILT |
999 | addr = options_.text_segment_address(); |
1000 | else | |
1001 | addr = target->default_text_segment_address(); | |
75f65a3e ILT |
1002 | off_t off = 0; |
1003 | bool was_readonly = false; | |
1004 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
1005 | p != this->segment_list_.end(); | |
1006 | ++p) | |
1007 | { | |
1008 | if ((*p)->type() == elfcpp::PT_LOAD) | |
1009 | { | |
1010 | if (load_seg != NULL && load_seg != *p) | |
a3ad94ed | 1011 | gold_unreachable(); |
75f65a3e ILT |
1012 | load_seg = NULL; |
1013 | ||
1014 | // If the last segment was readonly, and this one is not, | |
1015 | // then skip the address forward one page, maintaining the | |
1016 | // same position within the page. This lets us store both | |
1017 | // segments overlapping on a single page in the file, but | |
1018 | // the loader will put them on different pages in memory. | |
1019 | ||
1020 | uint64_t orig_addr = addr; | |
1021 | uint64_t orig_off = off; | |
1022 | ||
1023 | uint64_t aligned_addr = addr; | |
1024 | uint64_t abi_pagesize = target->abi_pagesize(); | |
0496d5e5 ILT |
1025 | |
1026 | // FIXME: This should depend on the -n and -N options. | |
1027 | (*p)->set_minimum_addralign(target->common_pagesize()); | |
1028 | ||
75f65a3e ILT |
1029 | if (was_readonly && ((*p)->flags() & elfcpp::PF_W) != 0) |
1030 | { | |
ead1e424 | 1031 | uint64_t align = (*p)->addralign(); |
75f65a3e | 1032 | |
ead1e424 | 1033 | addr = align_address(addr, align); |
75f65a3e ILT |
1034 | aligned_addr = addr; |
1035 | if ((addr & (abi_pagesize - 1)) != 0) | |
1036 | addr = addr + abi_pagesize; | |
1037 | } | |
1038 | ||
ead1e424 | 1039 | unsigned int shndx_hold = *pshndx; |
75f65a3e | 1040 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
ead1e424 | 1041 | uint64_t new_addr = (*p)->set_section_addresses(addr, &off, pshndx); |
75f65a3e ILT |
1042 | |
1043 | // Now that we know the size of this segment, we may be able | |
1044 | // to save a page in memory, at the cost of wasting some | |
1045 | // file space, by instead aligning to the start of a new | |
1046 | // page. Here we use the real machine page size rather than | |
1047 | // the ABI mandated page size. | |
1048 | ||
1049 | if (aligned_addr != addr) | |
1050 | { | |
1051 | uint64_t common_pagesize = target->common_pagesize(); | |
1052 | uint64_t first_off = (common_pagesize | |
1053 | - (aligned_addr | |
1054 | & (common_pagesize - 1))); | |
1055 | uint64_t last_off = new_addr & (common_pagesize - 1); | |
1056 | if (first_off > 0 | |
1057 | && last_off > 0 | |
1058 | && ((aligned_addr & ~ (common_pagesize - 1)) | |
1059 | != (new_addr & ~ (common_pagesize - 1))) | |
1060 | && first_off + last_off <= common_pagesize) | |
1061 | { | |
ead1e424 ILT |
1062 | *pshndx = shndx_hold; |
1063 | addr = align_address(aligned_addr, common_pagesize); | |
75f65a3e | 1064 | off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1)); |
ead1e424 | 1065 | new_addr = (*p)->set_section_addresses(addr, &off, pshndx); |
75f65a3e ILT |
1066 | } |
1067 | } | |
1068 | ||
1069 | addr = new_addr; | |
1070 | ||
1071 | if (((*p)->flags() & elfcpp::PF_W) == 0) | |
1072 | was_readonly = true; | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | // Handle the non-PT_LOAD segments, setting their offsets from their | |
1077 | // section's offsets. | |
1078 | for (Segment_list::iterator p = this->segment_list_.begin(); | |
1079 | p != this->segment_list_.end(); | |
1080 | ++p) | |
1081 | { | |
1082 | if ((*p)->type() != elfcpp::PT_LOAD) | |
1083 | (*p)->set_offset(); | |
1084 | } | |
1085 | ||
7bf1f802 ILT |
1086 | // Set the TLS offsets for each section in the PT_TLS segment. |
1087 | if (this->tls_segment_ != NULL) | |
1088 | this->tls_segment_->set_tls_offsets(); | |
1089 | ||
75f65a3e ILT |
1090 | return off; |
1091 | } | |
1092 | ||
1093 | // Set the file offset of all the sections not associated with a | |
1094 | // segment. | |
1095 | ||
1096 | off_t | |
9a0910c3 | 1097 | Layout::set_section_offsets(off_t off, Layout::Section_offset_pass pass) |
75f65a3e | 1098 | { |
a3ad94ed ILT |
1099 | for (Section_list::iterator p = this->unattached_section_list_.begin(); |
1100 | p != this->unattached_section_list_.end(); | |
75f65a3e ILT |
1101 | ++p) |
1102 | { | |
27bc2bce ILT |
1103 | // The symtab section is handled in create_symtab_sections. |
1104 | if (*p == this->symtab_section_) | |
61ba1cf9 | 1105 | continue; |
27bc2bce | 1106 | |
96803768 ILT |
1107 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
1108 | && (*p)->requires_postprocessing()) | |
1109 | (*p)->create_postprocessing_buffer(); | |
1110 | ||
9a0910c3 ILT |
1111 | if (pass == BEFORE_INPUT_SECTIONS_PASS |
1112 | && (*p)->after_input_sections()) | |
1113 | continue; | |
1114 | else if (pass == AFTER_INPUT_SECTIONS_PASS | |
1115 | && (!(*p)->after_input_sections() | |
1116 | || (*p)->type() == elfcpp::SHT_STRTAB)) | |
1117 | continue; | |
1118 | else if (pass == STRTAB_AFTER_INPUT_SECTIONS_PASS | |
1119 | && (!(*p)->after_input_sections() | |
1120 | || (*p)->type() != elfcpp::SHT_STRTAB)) | |
1121 | continue; | |
27bc2bce | 1122 | |
ead1e424 | 1123 | off = align_address(off, (*p)->addralign()); |
27bc2bce ILT |
1124 | (*p)->set_file_offset(off); |
1125 | (*p)->finalize_data_size(); | |
75f65a3e | 1126 | off += (*p)->data_size(); |
96803768 ILT |
1127 | |
1128 | // At this point the name must be set. | |
1129 | if (pass != STRTAB_AFTER_INPUT_SECTIONS_PASS) | |
1130 | this->namepool_.add((*p)->name(), false, NULL); | |
75f65a3e ILT |
1131 | } |
1132 | return off; | |
1133 | } | |
1134 | ||
86887060 ILT |
1135 | // Set the section indexes of all the sections not associated with a |
1136 | // segment. | |
1137 | ||
1138 | unsigned int | |
1139 | Layout::set_section_indexes(unsigned int shndx) | |
1140 | { | |
1141 | for (Section_list::iterator p = this->unattached_section_list_.begin(); | |
1142 | p != this->unattached_section_list_.end(); | |
1143 | ++p) | |
1144 | { | |
1145 | (*p)->set_out_shndx(shndx); | |
1146 | ++shndx; | |
1147 | } | |
1148 | return shndx; | |
1149 | } | |
1150 | ||
7bf1f802 ILT |
1151 | // Count the local symbols in the regular symbol table and the dynamic |
1152 | // symbol table, and build the respective string pools. | |
1153 | ||
1154 | void | |
1155 | Layout::count_local_symbols(const Input_objects* input_objects) | |
1156 | { | |
6d013333 ILT |
1157 | // First, figure out an upper bound on the number of symbols we'll |
1158 | // be inserting into each pool. This helps us create the pools with | |
1159 | // the right size, to avoid unnecessary hashtable resizing. | |
1160 | unsigned int symbol_count = 0; | |
1161 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
1162 | p != input_objects->relobj_end(); | |
1163 | ++p) | |
1164 | symbol_count += (*p)->local_symbol_count(); | |
1165 | ||
1166 | // Go from "upper bound" to "estimate." We overcount for two | |
1167 | // reasons: we double-count symbols that occur in more than one | |
1168 | // object file, and we count symbols that are dropped from the | |
1169 | // output. Add it all together and assume we overcount by 100%. | |
1170 | symbol_count /= 2; | |
1171 | ||
1172 | // We assume all symbols will go into both the sympool and dynpool. | |
1173 | this->sympool_.reserve(symbol_count); | |
1174 | this->dynpool_.reserve(symbol_count); | |
1175 | ||
7bf1f802 ILT |
1176 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
1177 | p != input_objects->relobj_end(); | |
1178 | ++p) | |
1179 | { | |
1180 | Task_lock_obj<Object> tlo(**p); | |
1181 | (*p)->count_local_symbols(&this->sympool_, &this->dynpool_); | |
1182 | } | |
1183 | } | |
1184 | ||
b8e6aad9 ILT |
1185 | // Create the symbol table sections. Here we also set the final |
1186 | // values of the symbols. At this point all the loadable sections are | |
1187 | // fully laid out. | |
75f65a3e ILT |
1188 | |
1189 | void | |
9025d29d | 1190 | Layout::create_symtab_sections(const Input_objects* input_objects, |
75f65a3e | 1191 | Symbol_table* symtab, |
16649710 | 1192 | off_t* poff) |
75f65a3e | 1193 | { |
61ba1cf9 ILT |
1194 | int symsize; |
1195 | unsigned int align; | |
9025d29d | 1196 | if (parameters->get_size() == 32) |
61ba1cf9 ILT |
1197 | { |
1198 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
1199 | align = 4; | |
1200 | } | |
9025d29d | 1201 | else if (parameters->get_size() == 64) |
61ba1cf9 ILT |
1202 | { |
1203 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
1204 | align = 8; | |
1205 | } | |
1206 | else | |
a3ad94ed | 1207 | gold_unreachable(); |
61ba1cf9 ILT |
1208 | |
1209 | off_t off = *poff; | |
ead1e424 | 1210 | off = align_address(off, align); |
61ba1cf9 ILT |
1211 | off_t startoff = off; |
1212 | ||
1213 | // Save space for the dummy symbol at the start of the section. We | |
1214 | // never bother to write this out--it will just be left as zero. | |
1215 | off += symsize; | |
c06b7b0b | 1216 | unsigned int local_symbol_index = 1; |
61ba1cf9 | 1217 | |
a3ad94ed ILT |
1218 | // Add STT_SECTION symbols for each Output section which needs one. |
1219 | for (Section_list::iterator p = this->section_list_.begin(); | |
1220 | p != this->section_list_.end(); | |
1221 | ++p) | |
1222 | { | |
1223 | if (!(*p)->needs_symtab_index()) | |
1224 | (*p)->set_symtab_index(-1U); | |
1225 | else | |
1226 | { | |
1227 | (*p)->set_symtab_index(local_symbol_index); | |
1228 | ++local_symbol_index; | |
1229 | off += symsize; | |
1230 | } | |
1231 | } | |
1232 | ||
f6ce93d6 ILT |
1233 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
1234 | p != input_objects->relobj_end(); | |
75f65a3e ILT |
1235 | ++p) |
1236 | { | |
c06b7b0b | 1237 | unsigned int index = (*p)->finalize_local_symbols(local_symbol_index, |
7bf1f802 | 1238 | off); |
c06b7b0b ILT |
1239 | off += (index - local_symbol_index) * symsize; |
1240 | local_symbol_index = index; | |
75f65a3e ILT |
1241 | } |
1242 | ||
c06b7b0b | 1243 | unsigned int local_symcount = local_symbol_index; |
a3ad94ed | 1244 | gold_assert(local_symcount * symsize == off - startoff); |
61ba1cf9 | 1245 | |
16649710 ILT |
1246 | off_t dynoff; |
1247 | size_t dyn_global_index; | |
1248 | size_t dyncount; | |
1249 | if (this->dynsym_section_ == NULL) | |
1250 | { | |
1251 | dynoff = 0; | |
1252 | dyn_global_index = 0; | |
1253 | dyncount = 0; | |
1254 | } | |
1255 | else | |
1256 | { | |
1257 | dyn_global_index = this->dynsym_section_->info(); | |
1258 | off_t locsize = dyn_global_index * this->dynsym_section_->entsize(); | |
1259 | dynoff = this->dynsym_section_->offset() + locsize; | |
1260 | dyncount = (this->dynsym_section_->data_size() - locsize) / symsize; | |
f5c3f225 | 1261 | gold_assert(static_cast<off_t>(dyncount * symsize) |
16649710 ILT |
1262 | == this->dynsym_section_->data_size() - locsize); |
1263 | } | |
1264 | ||
1265 | off = symtab->finalize(local_symcount, off, dynoff, dyn_global_index, | |
1266 | dyncount, &this->sympool_); | |
75f65a3e | 1267 | |
9e2dcb77 ILT |
1268 | if (!parameters->strip_all()) |
1269 | { | |
1270 | this->sympool_.set_string_offsets(); | |
61ba1cf9 | 1271 | |
cfd73a4e | 1272 | const char* symtab_name = this->namepool_.add(".symtab", false, NULL); |
9e2dcb77 ILT |
1273 | Output_section* osymtab = this->make_output_section(symtab_name, |
1274 | elfcpp::SHT_SYMTAB, | |
1275 | 0); | |
1276 | this->symtab_section_ = osymtab; | |
a3ad94ed | 1277 | |
27bc2bce ILT |
1278 | Output_section_data* pos = new Output_data_fixed_space(off - startoff, |
1279 | align); | |
9e2dcb77 | 1280 | osymtab->add_output_section_data(pos); |
61ba1cf9 | 1281 | |
cfd73a4e | 1282 | const char* strtab_name = this->namepool_.add(".strtab", false, NULL); |
9e2dcb77 ILT |
1283 | Output_section* ostrtab = this->make_output_section(strtab_name, |
1284 | elfcpp::SHT_STRTAB, | |
1285 | 0); | |
a3ad94ed | 1286 | |
9e2dcb77 ILT |
1287 | Output_section_data* pstr = new Output_data_strtab(&this->sympool_); |
1288 | ostrtab->add_output_section_data(pstr); | |
61ba1cf9 | 1289 | |
27bc2bce ILT |
1290 | osymtab->set_file_offset(startoff); |
1291 | osymtab->finalize_data_size(); | |
9e2dcb77 ILT |
1292 | osymtab->set_link_section(ostrtab); |
1293 | osymtab->set_info(local_symcount); | |
1294 | osymtab->set_entsize(symsize); | |
61ba1cf9 | 1295 | |
9e2dcb77 ILT |
1296 | *poff = off; |
1297 | } | |
75f65a3e ILT |
1298 | } |
1299 | ||
1300 | // Create the .shstrtab section, which holds the names of the | |
1301 | // sections. At the time this is called, we have created all the | |
1302 | // output sections except .shstrtab itself. | |
1303 | ||
1304 | Output_section* | |
1305 | Layout::create_shstrtab() | |
1306 | { | |
1307 | // FIXME: We don't need to create a .shstrtab section if we are | |
1308 | // stripping everything. | |
1309 | ||
cfd73a4e | 1310 | const char* name = this->namepool_.add(".shstrtab", false, NULL); |
75f65a3e | 1311 | |
a3ad94ed | 1312 | Output_section* os = this->make_output_section(name, elfcpp::SHT_STRTAB, 0); |
75f65a3e | 1313 | |
27bc2bce ILT |
1314 | // We can't write out this section until we've set all the section |
1315 | // names, and we don't set the names of compressed output sections | |
1316 | // until relocations are complete. | |
1317 | os->set_after_input_sections(); | |
1318 | ||
a3ad94ed ILT |
1319 | Output_section_data* posd = new Output_data_strtab(&this->namepool_); |
1320 | os->add_output_section_data(posd); | |
75f65a3e ILT |
1321 | |
1322 | return os; | |
1323 | } | |
1324 | ||
1325 | // Create the section headers. SIZE is 32 or 64. OFF is the file | |
1326 | // offset. | |
1327 | ||
27bc2bce | 1328 | void |
9025d29d | 1329 | Layout::create_shdrs(off_t* poff) |
75f65a3e ILT |
1330 | { |
1331 | Output_section_headers* oshdrs; | |
9025d29d | 1332 | oshdrs = new Output_section_headers(this, |
16649710 ILT |
1333 | &this->segment_list_, |
1334 | &this->unattached_section_list_, | |
61ba1cf9 | 1335 | &this->namepool_); |
ead1e424 | 1336 | off_t off = align_address(*poff, oshdrs->addralign()); |
27bc2bce | 1337 | oshdrs->set_address_and_file_offset(0, off); |
61ba1cf9 ILT |
1338 | off += oshdrs->data_size(); |
1339 | *poff = off; | |
27bc2bce | 1340 | this->section_headers_ = oshdrs; |
54dc6425 ILT |
1341 | } |
1342 | ||
dbe717ef ILT |
1343 | // Create the dynamic symbol table. |
1344 | ||
1345 | void | |
7bf1f802 ILT |
1346 | Layout::create_dynamic_symtab(const Input_objects* input_objects, |
1347 | const Target* target, Symbol_table* symtab, | |
14b31740 ILT |
1348 | Output_section **pdynstr, |
1349 | unsigned int* plocal_dynamic_count, | |
1350 | std::vector<Symbol*>* pdynamic_symbols, | |
1351 | Versions* pversions) | |
dbe717ef | 1352 | { |
a3ad94ed ILT |
1353 | // Count all the symbols in the dynamic symbol table, and set the |
1354 | // dynamic symbol indexes. | |
dbe717ef | 1355 | |
a3ad94ed ILT |
1356 | // Skip symbol 0, which is always all zeroes. |
1357 | unsigned int index = 1; | |
dbe717ef | 1358 | |
a3ad94ed ILT |
1359 | // Add STT_SECTION symbols for each Output section which needs one. |
1360 | for (Section_list::iterator p = this->section_list_.begin(); | |
1361 | p != this->section_list_.end(); | |
1362 | ++p) | |
1363 | { | |
1364 | if (!(*p)->needs_dynsym_index()) | |
1365 | (*p)->set_dynsym_index(-1U); | |
1366 | else | |
1367 | { | |
1368 | (*p)->set_dynsym_index(index); | |
1369 | ++index; | |
1370 | } | |
1371 | } | |
1372 | ||
7bf1f802 ILT |
1373 | // Count the local symbols that need to go in the dynamic symbol table, |
1374 | // and set the dynamic symbol indexes. | |
1375 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
1376 | p != input_objects->relobj_end(); | |
1377 | ++p) | |
1378 | { | |
1379 | unsigned int new_index = (*p)->set_local_dynsym_indexes(index); | |
1380 | index = new_index; | |
1381 | } | |
a3ad94ed ILT |
1382 | |
1383 | unsigned int local_symcount = index; | |
14b31740 | 1384 | *plocal_dynamic_count = local_symcount; |
a3ad94ed ILT |
1385 | |
1386 | // FIXME: We have to tell set_dynsym_indexes whether the | |
1387 | // -E/--export-dynamic option was used. | |
35cdfc9a ILT |
1388 | index = symtab->set_dynsym_indexes(target, index, pdynamic_symbols, |
1389 | &this->dynpool_, pversions); | |
a3ad94ed ILT |
1390 | |
1391 | int symsize; | |
1392 | unsigned int align; | |
9025d29d | 1393 | const int size = parameters->get_size(); |
a3ad94ed ILT |
1394 | if (size == 32) |
1395 | { | |
1396 | symsize = elfcpp::Elf_sizes<32>::sym_size; | |
1397 | align = 4; | |
1398 | } | |
1399 | else if (size == 64) | |
1400 | { | |
1401 | symsize = elfcpp::Elf_sizes<64>::sym_size; | |
1402 | align = 8; | |
1403 | } | |
1404 | else | |
1405 | gold_unreachable(); | |
1406 | ||
14b31740 ILT |
1407 | // Create the dynamic symbol table section. |
1408 | ||
cfd73a4e | 1409 | const char* dynsym_name = this->namepool_.add(".dynsym", false, NULL); |
a3ad94ed ILT |
1410 | Output_section* dynsym = this->make_output_section(dynsym_name, |
1411 | elfcpp::SHT_DYNSYM, | |
1412 | elfcpp::SHF_ALLOC); | |
1413 | ||
27bc2bce ILT |
1414 | Output_section_data* odata = new Output_data_fixed_space(index * symsize, |
1415 | align); | |
a3ad94ed ILT |
1416 | dynsym->add_output_section_data(odata); |
1417 | ||
1418 | dynsym->set_info(local_symcount); | |
1419 | dynsym->set_entsize(symsize); | |
1420 | dynsym->set_addralign(align); | |
1421 | ||
1422 | this->dynsym_section_ = dynsym; | |
1423 | ||
16649710 | 1424 | Output_data_dynamic* const odyn = this->dynamic_data_; |
a3ad94ed ILT |
1425 | odyn->add_section_address(elfcpp::DT_SYMTAB, dynsym); |
1426 | odyn->add_constant(elfcpp::DT_SYMENT, symsize); | |
1427 | ||
14b31740 ILT |
1428 | // Create the dynamic string table section. |
1429 | ||
cfd73a4e | 1430 | const char* dynstr_name = this->namepool_.add(".dynstr", false, NULL); |
a3ad94ed ILT |
1431 | Output_section* dynstr = this->make_output_section(dynstr_name, |
1432 | elfcpp::SHT_STRTAB, | |
1433 | elfcpp::SHF_ALLOC); | |
1434 | ||
1435 | Output_section_data* strdata = new Output_data_strtab(&this->dynpool_); | |
1436 | dynstr->add_output_section_data(strdata); | |
1437 | ||
16649710 ILT |
1438 | dynsym->set_link_section(dynstr); |
1439 | this->dynamic_section_->set_link_section(dynstr); | |
1440 | ||
a3ad94ed ILT |
1441 | odyn->add_section_address(elfcpp::DT_STRTAB, dynstr); |
1442 | odyn->add_section_size(elfcpp::DT_STRSZ, dynstr); | |
1443 | ||
14b31740 ILT |
1444 | *pdynstr = dynstr; |
1445 | ||
1446 | // Create the hash tables. | |
1447 | ||
a3ad94ed ILT |
1448 | // FIXME: We need an option to create a GNU hash table. |
1449 | ||
1450 | unsigned char* phash; | |
1451 | unsigned int hashlen; | |
9025d29d | 1452 | Dynobj::create_elf_hash_table(*pdynamic_symbols, local_symcount, |
a3ad94ed ILT |
1453 | &phash, &hashlen); |
1454 | ||
cfd73a4e | 1455 | const char* hash_name = this->namepool_.add(".hash", false, NULL); |
a3ad94ed ILT |
1456 | Output_section* hashsec = this->make_output_section(hash_name, |
1457 | elfcpp::SHT_HASH, | |
1458 | elfcpp::SHF_ALLOC); | |
1459 | ||
1460 | Output_section_data* hashdata = new Output_data_const_buffer(phash, | |
1461 | hashlen, | |
1462 | align); | |
1463 | hashsec->add_output_section_data(hashdata); | |
1464 | ||
16649710 | 1465 | hashsec->set_link_section(dynsym); |
a3ad94ed | 1466 | hashsec->set_entsize(4); |
a3ad94ed ILT |
1467 | |
1468 | odyn->add_section_address(elfcpp::DT_HASH, hashsec); | |
dbe717ef ILT |
1469 | } |
1470 | ||
7bf1f802 ILT |
1471 | // Assign offsets to each local portion of the dynamic symbol table. |
1472 | ||
1473 | void | |
1474 | Layout::assign_local_dynsym_offsets(const Input_objects* input_objects) | |
1475 | { | |
1476 | Output_section* dynsym = this->dynsym_section_; | |
1477 | gold_assert(dynsym != NULL); | |
1478 | ||
1479 | off_t off = dynsym->offset(); | |
1480 | ||
1481 | // Skip the dummy symbol at the start of the section. | |
1482 | off += dynsym->entsize(); | |
1483 | ||
1484 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
1485 | p != input_objects->relobj_end(); | |
1486 | ++p) | |
1487 | { | |
1488 | unsigned int count = (*p)->set_local_dynsym_offset(off); | |
1489 | off += count * dynsym->entsize(); | |
1490 | } | |
1491 | } | |
1492 | ||
14b31740 ILT |
1493 | // Create the version sections. |
1494 | ||
1495 | void | |
9025d29d | 1496 | Layout::create_version_sections(const Versions* versions, |
46fe1623 | 1497 | const Symbol_table* symtab, |
14b31740 ILT |
1498 | unsigned int local_symcount, |
1499 | const std::vector<Symbol*>& dynamic_symbols, | |
1500 | const Output_section* dynstr) | |
1501 | { | |
1502 | if (!versions->any_defs() && !versions->any_needs()) | |
1503 | return; | |
1504 | ||
9025d29d | 1505 | if (parameters->get_size() == 32) |
14b31740 | 1506 | { |
9025d29d | 1507 | if (parameters->is_big_endian()) |
193a53d9 ILT |
1508 | { |
1509 | #ifdef HAVE_TARGET_32_BIG | |
1510 | this->sized_create_version_sections | |
1511 | SELECT_SIZE_ENDIAN_NAME(32, true)( | |
46fe1623 | 1512 | versions, symtab, local_symcount, dynamic_symbols, dynstr |
193a53d9 ILT |
1513 | SELECT_SIZE_ENDIAN(32, true)); |
1514 | #else | |
1515 | gold_unreachable(); | |
1516 | #endif | |
1517 | } | |
14b31740 | 1518 | else |
193a53d9 ILT |
1519 | { |
1520 | #ifdef HAVE_TARGET_32_LITTLE | |
1521 | this->sized_create_version_sections | |
1522 | SELECT_SIZE_ENDIAN_NAME(32, false)( | |
46fe1623 | 1523 | versions, symtab, local_symcount, dynamic_symbols, dynstr |
193a53d9 ILT |
1524 | SELECT_SIZE_ENDIAN(32, false)); |
1525 | #else | |
1526 | gold_unreachable(); | |
1527 | #endif | |
1528 | } | |
14b31740 | 1529 | } |
9025d29d | 1530 | else if (parameters->get_size() == 64) |
14b31740 | 1531 | { |
9025d29d | 1532 | if (parameters->is_big_endian()) |
193a53d9 ILT |
1533 | { |
1534 | #ifdef HAVE_TARGET_64_BIG | |
1535 | this->sized_create_version_sections | |
1536 | SELECT_SIZE_ENDIAN_NAME(64, true)( | |
46fe1623 | 1537 | versions, symtab, local_symcount, dynamic_symbols, dynstr |
193a53d9 ILT |
1538 | SELECT_SIZE_ENDIAN(64, true)); |
1539 | #else | |
1540 | gold_unreachable(); | |
1541 | #endif | |
1542 | } | |
14b31740 | 1543 | else |
193a53d9 ILT |
1544 | { |
1545 | #ifdef HAVE_TARGET_64_LITTLE | |
1546 | this->sized_create_version_sections | |
1547 | SELECT_SIZE_ENDIAN_NAME(64, false)( | |
46fe1623 | 1548 | versions, symtab, local_symcount, dynamic_symbols, dynstr |
193a53d9 ILT |
1549 | SELECT_SIZE_ENDIAN(64, false)); |
1550 | #else | |
1551 | gold_unreachable(); | |
1552 | #endif | |
1553 | } | |
14b31740 ILT |
1554 | } |
1555 | else | |
1556 | gold_unreachable(); | |
1557 | } | |
1558 | ||
1559 | // Create the version sections, sized version. | |
1560 | ||
1561 | template<int size, bool big_endian> | |
1562 | void | |
1563 | Layout::sized_create_version_sections( | |
1564 | const Versions* versions, | |
46fe1623 | 1565 | const Symbol_table* symtab, |
14b31740 ILT |
1566 | unsigned int local_symcount, |
1567 | const std::vector<Symbol*>& dynamic_symbols, | |
91da9340 ILT |
1568 | const Output_section* dynstr |
1569 | ACCEPT_SIZE_ENDIAN) | |
14b31740 | 1570 | { |
cfd73a4e | 1571 | const char* vname = this->namepool_.add(".gnu.version", false, NULL); |
14b31740 ILT |
1572 | Output_section* vsec = this->make_output_section(vname, |
1573 | elfcpp::SHT_GNU_versym, | |
1574 | elfcpp::SHF_ALLOC); | |
1575 | ||
1576 | unsigned char* vbuf; | |
1577 | unsigned int vsize; | |
91da9340 | 1578 | versions->symbol_section_contents SELECT_SIZE_ENDIAN_NAME(size, big_endian)( |
46fe1623 | 1579 | symtab, &this->dynpool_, local_symcount, dynamic_symbols, &vbuf, &vsize |
7e1edb90 | 1580 | SELECT_SIZE_ENDIAN(size, big_endian)); |
14b31740 ILT |
1581 | |
1582 | Output_section_data* vdata = new Output_data_const_buffer(vbuf, vsize, 2); | |
1583 | ||
1584 | vsec->add_output_section_data(vdata); | |
1585 | vsec->set_entsize(2); | |
1586 | vsec->set_link_section(this->dynsym_section_); | |
1587 | ||
1588 | Output_data_dynamic* const odyn = this->dynamic_data_; | |
1589 | odyn->add_section_address(elfcpp::DT_VERSYM, vsec); | |
1590 | ||
1591 | if (versions->any_defs()) | |
1592 | { | |
cfd73a4e | 1593 | const char* vdname = this->namepool_.add(".gnu.version_d", false, NULL); |
14b31740 ILT |
1594 | Output_section *vdsec; |
1595 | vdsec = this->make_output_section(vdname, elfcpp::SHT_GNU_verdef, | |
1596 | elfcpp::SHF_ALLOC); | |
1597 | ||
1598 | unsigned char* vdbuf; | |
1599 | unsigned int vdsize; | |
1600 | unsigned int vdentries; | |
91da9340 ILT |
1601 | versions->def_section_contents SELECT_SIZE_ENDIAN_NAME(size, big_endian)( |
1602 | &this->dynpool_, &vdbuf, &vdsize, &vdentries | |
1603 | SELECT_SIZE_ENDIAN(size, big_endian)); | |
14b31740 ILT |
1604 | |
1605 | Output_section_data* vddata = new Output_data_const_buffer(vdbuf, | |
1606 | vdsize, | |
1607 | 4); | |
1608 | ||
1609 | vdsec->add_output_section_data(vddata); | |
1610 | vdsec->set_link_section(dynstr); | |
1611 | vdsec->set_info(vdentries); | |
1612 | ||
1613 | odyn->add_section_address(elfcpp::DT_VERDEF, vdsec); | |
1614 | odyn->add_constant(elfcpp::DT_VERDEFNUM, vdentries); | |
1615 | } | |
1616 | ||
1617 | if (versions->any_needs()) | |
1618 | { | |
cfd73a4e | 1619 | const char* vnname = this->namepool_.add(".gnu.version_r", false, NULL); |
14b31740 ILT |
1620 | Output_section* vnsec; |
1621 | vnsec = this->make_output_section(vnname, elfcpp::SHT_GNU_verneed, | |
1622 | elfcpp::SHF_ALLOC); | |
1623 | ||
1624 | unsigned char* vnbuf; | |
1625 | unsigned int vnsize; | |
1626 | unsigned int vnentries; | |
91da9340 ILT |
1627 | versions->need_section_contents SELECT_SIZE_ENDIAN_NAME(size, big_endian) |
1628 | (&this->dynpool_, &vnbuf, &vnsize, &vnentries | |
1629 | SELECT_SIZE_ENDIAN(size, big_endian)); | |
14b31740 ILT |
1630 | |
1631 | Output_section_data* vndata = new Output_data_const_buffer(vnbuf, | |
1632 | vnsize, | |
1633 | 4); | |
1634 | ||
1635 | vnsec->add_output_section_data(vndata); | |
1636 | vnsec->set_link_section(dynstr); | |
1637 | vnsec->set_info(vnentries); | |
1638 | ||
1639 | odyn->add_section_address(elfcpp::DT_VERNEED, vnsec); | |
1640 | odyn->add_constant(elfcpp::DT_VERNEEDNUM, vnentries); | |
1641 | } | |
1642 | } | |
1643 | ||
dbe717ef ILT |
1644 | // Create the .interp section and PT_INTERP segment. |
1645 | ||
1646 | void | |
1647 | Layout::create_interp(const Target* target) | |
1648 | { | |
1649 | const char* interp = this->options_.dynamic_linker(); | |
1650 | if (interp == NULL) | |
1651 | { | |
1652 | interp = target->dynamic_linker(); | |
a3ad94ed | 1653 | gold_assert(interp != NULL); |
dbe717ef ILT |
1654 | } |
1655 | ||
1656 | size_t len = strlen(interp) + 1; | |
1657 | ||
1658 | Output_section_data* odata = new Output_data_const(interp, len, 1); | |
1659 | ||
cfd73a4e | 1660 | const char* interp_name = this->namepool_.add(".interp", false, NULL); |
dbe717ef ILT |
1661 | Output_section* osec = this->make_output_section(interp_name, |
1662 | elfcpp::SHT_PROGBITS, | |
1663 | elfcpp::SHF_ALLOC); | |
1664 | osec->add_output_section_data(odata); | |
1665 | ||
1666 | Output_segment* oseg = new Output_segment(elfcpp::PT_INTERP, elfcpp::PF_R); | |
1667 | this->segment_list_.push_back(oseg); | |
1668 | oseg->add_initial_output_section(osec, elfcpp::PF_R); | |
1669 | } | |
1670 | ||
a3ad94ed ILT |
1671 | // Finish the .dynamic section and PT_DYNAMIC segment. |
1672 | ||
1673 | void | |
1674 | Layout::finish_dynamic_section(const Input_objects* input_objects, | |
16649710 | 1675 | const Symbol_table* symtab) |
a3ad94ed | 1676 | { |
a3ad94ed ILT |
1677 | Output_segment* oseg = new Output_segment(elfcpp::PT_DYNAMIC, |
1678 | elfcpp::PF_R | elfcpp::PF_W); | |
1679 | this->segment_list_.push_back(oseg); | |
1680 | oseg->add_initial_output_section(this->dynamic_section_, | |
1681 | elfcpp::PF_R | elfcpp::PF_W); | |
1682 | ||
16649710 ILT |
1683 | Output_data_dynamic* const odyn = this->dynamic_data_; |
1684 | ||
a3ad94ed ILT |
1685 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); |
1686 | p != input_objects->dynobj_end(); | |
1687 | ++p) | |
1688 | { | |
1689 | // FIXME: Handle --as-needed. | |
1690 | odyn->add_string(elfcpp::DT_NEEDED, (*p)->soname()); | |
1691 | } | |
1692 | ||
1693 | // FIXME: Support --init and --fini. | |
1694 | Symbol* sym = symtab->lookup("_init"); | |
14b31740 | 1695 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
1696 | odyn->add_symbol(elfcpp::DT_INIT, sym); |
1697 | ||
1698 | sym = symtab->lookup("_fini"); | |
14b31740 | 1699 | if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) |
a3ad94ed ILT |
1700 | odyn->add_symbol(elfcpp::DT_FINI, sym); |
1701 | ||
1702 | // FIXME: Support DT_INIT_ARRAY and DT_FINI_ARRAY. | |
41f542e7 ILT |
1703 | |
1704 | // Add a DT_RPATH entry if needed. | |
1705 | const General_options::Dir_list& rpath(this->options_.rpath()); | |
1706 | if (!rpath.empty()) | |
1707 | { | |
1708 | std::string rpath_val; | |
1709 | for (General_options::Dir_list::const_iterator p = rpath.begin(); | |
1710 | p != rpath.end(); | |
1711 | ++p) | |
1712 | { | |
1713 | if (rpath_val.empty()) | |
ad2d6943 | 1714 | rpath_val = p->name(); |
41f542e7 ILT |
1715 | else |
1716 | { | |
1717 | // Eliminate duplicates. | |
1718 | General_options::Dir_list::const_iterator q; | |
1719 | for (q = rpath.begin(); q != p; ++q) | |
ad2d6943 | 1720 | if (q->name() == p->name()) |
41f542e7 ILT |
1721 | break; |
1722 | if (q == p) | |
1723 | { | |
1724 | rpath_val += ':'; | |
ad2d6943 | 1725 | rpath_val += p->name(); |
41f542e7 ILT |
1726 | } |
1727 | } | |
1728 | } | |
1729 | ||
1730 | odyn->add_string(elfcpp::DT_RPATH, rpath_val); | |
1731 | } | |
4f4c5f80 ILT |
1732 | |
1733 | // Look for text segments that have dynamic relocations. | |
1734 | bool have_textrel = false; | |
1735 | for (Segment_list::const_iterator p = this->segment_list_.begin(); | |
1736 | p != this->segment_list_.end(); | |
1737 | ++p) | |
1738 | { | |
1739 | if (((*p)->flags() & elfcpp::PF_W) == 0 | |
1740 | && (*p)->dynamic_reloc_count() > 0) | |
1741 | { | |
1742 | have_textrel = true; | |
1743 | break; | |
1744 | } | |
1745 | } | |
1746 | ||
1747 | // Add a DT_FLAGS entry. We add it even if no flags are set so that | |
1748 | // post-link tools can easily modify these flags if desired. | |
1749 | unsigned int flags = 0; | |
1750 | if (have_textrel) | |
6a41d30b ILT |
1751 | { |
1752 | // Add a DT_TEXTREL for compatibility with older loaders. | |
1753 | odyn->add_constant(elfcpp::DT_TEXTREL, 0); | |
1754 | flags |= elfcpp::DF_TEXTREL; | |
1755 | } | |
535890bb ILT |
1756 | if (parameters->output_is_shared() && this->has_static_tls()) |
1757 | flags |= elfcpp::DF_STATIC_TLS; | |
4f4c5f80 | 1758 | odyn->add_constant(elfcpp::DT_FLAGS, flags); |
a3ad94ed ILT |
1759 | } |
1760 | ||
a2fb1b05 ILT |
1761 | // The mapping of .gnu.linkonce section names to real section names. |
1762 | ||
ead1e424 | 1763 | #define MAPPING_INIT(f, t) { f, sizeof(f) - 1, t, sizeof(t) - 1 } |
a2fb1b05 ILT |
1764 | const Layout::Linkonce_mapping Layout::linkonce_mapping[] = |
1765 | { | |
1766 | MAPPING_INIT("d.rel.ro", ".data.rel.ro"), // Must be before "d". | |
1767 | MAPPING_INIT("t", ".text"), | |
1768 | MAPPING_INIT("r", ".rodata"), | |
1769 | MAPPING_INIT("d", ".data"), | |
1770 | MAPPING_INIT("b", ".bss"), | |
1771 | MAPPING_INIT("s", ".sdata"), | |
1772 | MAPPING_INIT("sb", ".sbss"), | |
1773 | MAPPING_INIT("s2", ".sdata2"), | |
1774 | MAPPING_INIT("sb2", ".sbss2"), | |
1775 | MAPPING_INIT("wi", ".debug_info"), | |
1776 | MAPPING_INIT("td", ".tdata"), | |
1777 | MAPPING_INIT("tb", ".tbss"), | |
1778 | MAPPING_INIT("lr", ".lrodata"), | |
1779 | MAPPING_INIT("l", ".ldata"), | |
1780 | MAPPING_INIT("lb", ".lbss"), | |
1781 | }; | |
1782 | #undef MAPPING_INIT | |
1783 | ||
1784 | const int Layout::linkonce_mapping_count = | |
1785 | sizeof(Layout::linkonce_mapping) / sizeof(Layout::linkonce_mapping[0]); | |
1786 | ||
1787 | // Return the name of the output section to use for a .gnu.linkonce | |
1788 | // section. This is based on the default ELF linker script of the old | |
1789 | // GNU linker. For example, we map a name like ".gnu.linkonce.t.foo" | |
ead1e424 ILT |
1790 | // to ".text". Set *PLEN to the length of the name. *PLEN is |
1791 | // initialized to the length of NAME. | |
a2fb1b05 ILT |
1792 | |
1793 | const char* | |
ead1e424 | 1794 | Layout::linkonce_output_name(const char* name, size_t *plen) |
a2fb1b05 ILT |
1795 | { |
1796 | const char* s = name + sizeof(".gnu.linkonce") - 1; | |
1797 | if (*s != '.') | |
1798 | return name; | |
1799 | ++s; | |
1800 | const Linkonce_mapping* plm = linkonce_mapping; | |
1801 | for (int i = 0; i < linkonce_mapping_count; ++i, ++plm) | |
1802 | { | |
1803 | if (strncmp(s, plm->from, plm->fromlen) == 0 && s[plm->fromlen] == '.') | |
ead1e424 ILT |
1804 | { |
1805 | *plen = plm->tolen; | |
1806 | return plm->to; | |
1807 | } | |
a2fb1b05 ILT |
1808 | } |
1809 | return name; | |
1810 | } | |
1811 | ||
ead1e424 ILT |
1812 | // Choose the output section name to use given an input section name. |
1813 | // Set *PLEN to the length of the name. *PLEN is initialized to the | |
1814 | // length of NAME. | |
1815 | ||
1816 | const char* | |
1817 | Layout::output_section_name(const char* name, size_t* plen) | |
1818 | { | |
1819 | if (Layout::is_linkonce(name)) | |
1820 | { | |
1821 | // .gnu.linkonce sections are laid out as though they were named | |
1822 | // for the sections are placed into. | |
1823 | return Layout::linkonce_output_name(name, plen); | |
1824 | } | |
1825 | ||
af4a8a83 ILT |
1826 | // gcc 4.3 generates the following sorts of section names when it |
1827 | // needs a section name specific to a function: | |
1828 | // .text.FN | |
1829 | // .rodata.FN | |
1830 | // .sdata2.FN | |
1831 | // .data.FN | |
1832 | // .data.rel.FN | |
1833 | // .data.rel.local.FN | |
1834 | // .data.rel.ro.FN | |
1835 | // .data.rel.ro.local.FN | |
1836 | // .sdata.FN | |
1837 | // .bss.FN | |
1838 | // .sbss.FN | |
1839 | // .tdata.FN | |
1840 | // .tbss.FN | |
1841 | ||
1842 | // The GNU linker maps all of those to the part before the .FN, | |
1843 | // except that .data.rel.local.FN is mapped to .data, and | |
1844 | // .data.rel.ro.local.FN is mapped to .data.rel.ro. The sections | |
1845 | // beginning with .data.rel.ro.local are grouped together. | |
1846 | ||
1847 | // For an anonymous namespace, the string FN can contain a '.'. | |
1848 | ||
1849 | // Also of interest: .rodata.strN.N, .rodata.cstN, both of which the | |
1850 | // GNU linker maps to .rodata. | |
1851 | ||
1852 | // The .data.rel.ro sections enable a security feature triggered by | |
1853 | // the -z relro option. Section which need to be relocated at | |
1854 | // program startup time but which may be readonly after startup are | |
1855 | // grouped into .data.rel.ro. They are then put into a PT_GNU_RELRO | |
1856 | // segment. The dynamic linker will make that segment writable, | |
1857 | // perform relocations, and then make it read-only. FIXME: We do | |
1858 | // not yet implement this optimization. | |
1859 | ||
1860 | // It is hard to handle this in a principled way. | |
1861 | ||
1862 | // These are the rules we follow: | |
1863 | ||
1864 | // If the section name has no initial '.', or no dot other than an | |
1865 | // initial '.', we use the name unchanged (i.e., "mysection" and | |
1866 | // ".text" are unchanged). | |
1867 | ||
1868 | // If the name starts with ".data.rel.ro" we use ".data.rel.ro". | |
1869 | ||
1870 | // Otherwise, we drop the second '.' and everything that comes after | |
1871 | // it (i.e., ".text.XXX" becomes ".text"). | |
ead1e424 ILT |
1872 | |
1873 | const char* s = name; | |
af4a8a83 ILT |
1874 | if (*s != '.') |
1875 | return name; | |
1876 | ++s; | |
ead1e424 ILT |
1877 | const char* sdot = strchr(s, '.'); |
1878 | if (sdot == NULL) | |
1879 | return name; | |
1880 | ||
af4a8a83 ILT |
1881 | const char* const data_rel_ro = ".data.rel.ro"; |
1882 | if (strncmp(name, data_rel_ro, strlen(data_rel_ro)) == 0) | |
ead1e424 | 1883 | { |
af4a8a83 ILT |
1884 | *plen = strlen(data_rel_ro); |
1885 | return data_rel_ro; | |
ead1e424 ILT |
1886 | } |
1887 | ||
ead1e424 ILT |
1888 | *plen = sdot - name; |
1889 | return name; | |
1890 | } | |
1891 | ||
a2fb1b05 ILT |
1892 | // Record the signature of a comdat section, and return whether to |
1893 | // include it in the link. If GROUP is true, this is a regular | |
1894 | // section group. If GROUP is false, this is a group signature | |
1895 | // derived from the name of a linkonce section. We want linkonce | |
1896 | // signatures and group signatures to block each other, but we don't | |
1897 | // want a linkonce signature to block another linkonce signature. | |
1898 | ||
1899 | bool | |
1900 | Layout::add_comdat(const char* signature, bool group) | |
1901 | { | |
1902 | std::string sig(signature); | |
1903 | std::pair<Signatures::iterator, bool> ins( | |
ead1e424 | 1904 | this->signatures_.insert(std::make_pair(sig, group))); |
a2fb1b05 ILT |
1905 | |
1906 | if (ins.second) | |
1907 | { | |
1908 | // This is the first time we've seen this signature. | |
1909 | return true; | |
1910 | } | |
1911 | ||
1912 | if (ins.first->second) | |
1913 | { | |
1914 | // We've already seen a real section group with this signature. | |
1915 | return false; | |
1916 | } | |
1917 | else if (group) | |
1918 | { | |
1919 | // This is a real section group, and we've already seen a | |
a0fa0c07 | 1920 | // linkonce section with this signature. Record that we've seen |
a2fb1b05 ILT |
1921 | // a section group, and don't include this section group. |
1922 | ins.first->second = true; | |
1923 | return false; | |
1924 | } | |
1925 | else | |
1926 | { | |
1927 | // We've already seen a linkonce section and this is a linkonce | |
1928 | // section. These don't block each other--this may be the same | |
1929 | // symbol name with different section types. | |
1930 | return true; | |
1931 | } | |
1932 | } | |
1933 | ||
730cdc88 ILT |
1934 | // Write out the Output_sections. Most won't have anything to write, |
1935 | // since most of the data will come from input sections which are | |
1936 | // handled elsewhere. But some Output_sections do have Output_data. | |
1937 | ||
1938 | void | |
1939 | Layout::write_output_sections(Output_file* of) const | |
1940 | { | |
1941 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1942 | p != this->section_list_.end(); | |
1943 | ++p) | |
1944 | { | |
1945 | if (!(*p)->after_input_sections()) | |
1946 | (*p)->write(of); | |
1947 | } | |
1948 | } | |
1949 | ||
61ba1cf9 ILT |
1950 | // Write out data not associated with a section or the symbol table. |
1951 | ||
1952 | void | |
9025d29d | 1953 | Layout::write_data(const Symbol_table* symtab, Output_file* of) const |
61ba1cf9 | 1954 | { |
9e2dcb77 | 1955 | if (!parameters->strip_all()) |
a3ad94ed | 1956 | { |
9e2dcb77 ILT |
1957 | const Output_section* symtab_section = this->symtab_section_; |
1958 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1959 | p != this->section_list_.end(); | |
1960 | ++p) | |
a3ad94ed | 1961 | { |
9e2dcb77 ILT |
1962 | if ((*p)->needs_symtab_index()) |
1963 | { | |
1964 | gold_assert(symtab_section != NULL); | |
1965 | unsigned int index = (*p)->symtab_index(); | |
1966 | gold_assert(index > 0 && index != -1U); | |
1967 | off_t off = (symtab_section->offset() | |
1968 | + index * symtab_section->entsize()); | |
1969 | symtab->write_section_symbol(*p, of, off); | |
1970 | } | |
a3ad94ed ILT |
1971 | } |
1972 | } | |
1973 | ||
1974 | const Output_section* dynsym_section = this->dynsym_section_; | |
1975 | for (Section_list::const_iterator p = this->section_list_.begin(); | |
1976 | p != this->section_list_.end(); | |
1977 | ++p) | |
1978 | { | |
1979 | if ((*p)->needs_dynsym_index()) | |
1980 | { | |
1981 | gold_assert(dynsym_section != NULL); | |
1982 | unsigned int index = (*p)->dynsym_index(); | |
1983 | gold_assert(index > 0 && index != -1U); | |
1984 | off_t off = (dynsym_section->offset() | |
1985 | + index * dynsym_section->entsize()); | |
9025d29d | 1986 | symtab->write_section_symbol(*p, of, off); |
a3ad94ed ILT |
1987 | } |
1988 | } | |
1989 | ||
a3ad94ed | 1990 | // Write out the Output_data which are not in an Output_section. |
61ba1cf9 ILT |
1991 | for (Data_list::const_iterator p = this->special_output_list_.begin(); |
1992 | p != this->special_output_list_.end(); | |
1993 | ++p) | |
1994 | (*p)->write(of); | |
1995 | } | |
1996 | ||
730cdc88 ILT |
1997 | // Write out the Output_sections which can only be written after the |
1998 | // input sections are complete. | |
1999 | ||
2000 | void | |
27bc2bce | 2001 | Layout::write_sections_after_input_sections(Output_file* of) |
730cdc88 | 2002 | { |
27bc2bce | 2003 | // Determine the final section offsets, and thus the final output |
9a0910c3 ILT |
2004 | // file size. Note we finalize the .shstrab last, to allow the |
2005 | // after_input_section sections to modify their section-names before | |
2006 | // writing. | |
27bc2bce | 2007 | off_t off = this->output_file_size_; |
9a0910c3 ILT |
2008 | off = this->set_section_offsets(off, AFTER_INPUT_SECTIONS_PASS); |
2009 | ||
9a0910c3 ILT |
2010 | // Now that we've finalized the names, we can finalize the shstrab. |
2011 | off = this->set_section_offsets(off, STRTAB_AFTER_INPUT_SECTIONS_PASS); | |
2012 | ||
27bc2bce ILT |
2013 | if (off > this->output_file_size_) |
2014 | { | |
2015 | of->resize(off); | |
2016 | this->output_file_size_ = off; | |
2017 | } | |
2018 | ||
730cdc88 ILT |
2019 | for (Section_list::const_iterator p = this->section_list_.begin(); |
2020 | p != this->section_list_.end(); | |
2021 | ++p) | |
2022 | { | |
2023 | if ((*p)->after_input_sections()) | |
2024 | (*p)->write(of); | |
2025 | } | |
27bc2bce ILT |
2026 | |
2027 | for (Section_list::const_iterator p = this->unattached_section_list_.begin(); | |
2028 | p != this->unattached_section_list_.end(); | |
2029 | ++p) | |
2030 | { | |
2031 | if ((*p)->after_input_sections()) | |
2032 | (*p)->write(of); | |
2033 | } | |
2034 | ||
2035 | this->section_headers_->write(of); | |
730cdc88 ILT |
2036 | } |
2037 | ||
ad8f37d1 ILT |
2038 | // Print statistical information to stderr. This is used for --stats. |
2039 | ||
2040 | void | |
2041 | Layout::print_stats() const | |
2042 | { | |
2043 | this->namepool_.print_stats("section name pool"); | |
2044 | this->sympool_.print_stats("output symbol name pool"); | |
2045 | this->dynpool_.print_stats("dynamic name pool"); | |
2046 | } | |
2047 | ||
730cdc88 ILT |
2048 | // Write_sections_task methods. |
2049 | ||
2050 | // We can always run this task. | |
2051 | ||
2052 | Task::Is_runnable_type | |
2053 | Write_sections_task::is_runnable(Workqueue*) | |
2054 | { | |
2055 | return IS_RUNNABLE; | |
2056 | } | |
2057 | ||
2058 | // We need to unlock both OUTPUT_SECTIONS_BLOCKER and FINAL_BLOCKER | |
2059 | // when finished. | |
2060 | ||
2061 | class Write_sections_task::Write_sections_locker : public Task_locker | |
2062 | { | |
2063 | public: | |
2064 | Write_sections_locker(Task_token& output_sections_blocker, | |
2065 | Task_token& final_blocker, | |
2066 | Workqueue* workqueue) | |
2067 | : output_sections_block_(output_sections_blocker, workqueue), | |
2068 | final_block_(final_blocker, workqueue) | |
2069 | { } | |
2070 | ||
2071 | private: | |
2072 | Task_block_token output_sections_block_; | |
2073 | Task_block_token final_block_; | |
2074 | }; | |
2075 | ||
2076 | Task_locker* | |
2077 | Write_sections_task::locks(Workqueue* workqueue) | |
2078 | { | |
2079 | return new Write_sections_locker(*this->output_sections_blocker_, | |
2080 | *this->final_blocker_, | |
2081 | workqueue); | |
2082 | } | |
2083 | ||
2084 | // Run the task--write out the data. | |
2085 | ||
2086 | void | |
2087 | Write_sections_task::run(Workqueue*) | |
2088 | { | |
2089 | this->layout_->write_output_sections(this->of_); | |
2090 | } | |
2091 | ||
61ba1cf9 ILT |
2092 | // Write_data_task methods. |
2093 | ||
2094 | // We can always run this task. | |
2095 | ||
2096 | Task::Is_runnable_type | |
2097 | Write_data_task::is_runnable(Workqueue*) | |
2098 | { | |
2099 | return IS_RUNNABLE; | |
2100 | } | |
2101 | ||
2102 | // We need to unlock FINAL_BLOCKER when finished. | |
2103 | ||
2104 | Task_locker* | |
2105 | Write_data_task::locks(Workqueue* workqueue) | |
2106 | { | |
2107 | return new Task_locker_block(*this->final_blocker_, workqueue); | |
2108 | } | |
2109 | ||
2110 | // Run the task--write out the data. | |
2111 | ||
2112 | void | |
2113 | Write_data_task::run(Workqueue*) | |
2114 | { | |
9025d29d | 2115 | this->layout_->write_data(this->symtab_, this->of_); |
61ba1cf9 ILT |
2116 | } |
2117 | ||
2118 | // Write_symbols_task methods. | |
2119 | ||
2120 | // We can always run this task. | |
2121 | ||
2122 | Task::Is_runnable_type | |
2123 | Write_symbols_task::is_runnable(Workqueue*) | |
2124 | { | |
2125 | return IS_RUNNABLE; | |
2126 | } | |
2127 | ||
2128 | // We need to unlock FINAL_BLOCKER when finished. | |
2129 | ||
2130 | Task_locker* | |
2131 | Write_symbols_task::locks(Workqueue* workqueue) | |
2132 | { | |
2133 | return new Task_locker_block(*this->final_blocker_, workqueue); | |
2134 | } | |
2135 | ||
2136 | // Run the task--write out the symbols. | |
2137 | ||
2138 | void | |
2139 | Write_symbols_task::run(Workqueue*) | |
2140 | { | |
9a2d6984 ILT |
2141 | this->symtab_->write_globals(this->input_objects_, this->sympool_, |
2142 | this->dynpool_, this->of_); | |
61ba1cf9 ILT |
2143 | } |
2144 | ||
730cdc88 ILT |
2145 | // Write_after_input_sections_task methods. |
2146 | ||
2147 | // We can only run this task after the input sections have completed. | |
2148 | ||
2149 | Task::Is_runnable_type | |
2150 | Write_after_input_sections_task::is_runnable(Workqueue*) | |
2151 | { | |
2152 | if (this->input_sections_blocker_->is_blocked()) | |
2153 | return IS_BLOCKED; | |
2154 | return IS_RUNNABLE; | |
2155 | } | |
2156 | ||
2157 | // We need to unlock FINAL_BLOCKER when finished. | |
2158 | ||
2159 | Task_locker* | |
2160 | Write_after_input_sections_task::locks(Workqueue* workqueue) | |
2161 | { | |
2162 | return new Task_locker_block(*this->final_blocker_, workqueue); | |
2163 | } | |
2164 | ||
2165 | // Run the task. | |
2166 | ||
2167 | void | |
2168 | Write_after_input_sections_task::run(Workqueue*) | |
2169 | { | |
2170 | this->layout_->write_sections_after_input_sections(this->of_); | |
2171 | } | |
2172 | ||
92e059d8 | 2173 | // Close_task_runner methods. |
61ba1cf9 ILT |
2174 | |
2175 | // Run the task--close the file. | |
2176 | ||
2177 | void | |
92e059d8 | 2178 | Close_task_runner::run(Workqueue*) |
61ba1cf9 ILT |
2179 | { |
2180 | this->of_->close(); | |
2181 | } | |
2182 | ||
a2fb1b05 ILT |
2183 | // Instantiate the templates we need. We could use the configure |
2184 | // script to restrict this to only the ones for implemented targets. | |
2185 | ||
193a53d9 | 2186 | #ifdef HAVE_TARGET_32_LITTLE |
a2fb1b05 ILT |
2187 | template |
2188 | Output_section* | |
730cdc88 ILT |
2189 | Layout::layout<32, false>(Sized_relobj<32, false>* object, unsigned int shndx, |
2190 | const char* name, | |
2191 | const elfcpp::Shdr<32, false>& shdr, | |
2192 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 2193 | #endif |
a2fb1b05 | 2194 | |
193a53d9 | 2195 | #ifdef HAVE_TARGET_32_BIG |
a2fb1b05 ILT |
2196 | template |
2197 | Output_section* | |
730cdc88 ILT |
2198 | Layout::layout<32, true>(Sized_relobj<32, true>* object, unsigned int shndx, |
2199 | const char* name, | |
2200 | const elfcpp::Shdr<32, true>& shdr, | |
2201 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 2202 | #endif |
a2fb1b05 | 2203 | |
193a53d9 | 2204 | #ifdef HAVE_TARGET_64_LITTLE |
a2fb1b05 ILT |
2205 | template |
2206 | Output_section* | |
730cdc88 ILT |
2207 | Layout::layout<64, false>(Sized_relobj<64, false>* object, unsigned int shndx, |
2208 | const char* name, | |
2209 | const elfcpp::Shdr<64, false>& shdr, | |
2210 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 2211 | #endif |
a2fb1b05 | 2212 | |
193a53d9 | 2213 | #ifdef HAVE_TARGET_64_BIG |
a2fb1b05 ILT |
2214 | template |
2215 | Output_section* | |
730cdc88 ILT |
2216 | Layout::layout<64, true>(Sized_relobj<64, true>* object, unsigned int shndx, |
2217 | const char* name, | |
2218 | const elfcpp::Shdr<64, true>& shdr, | |
2219 | unsigned int, unsigned int, off_t*); | |
193a53d9 | 2220 | #endif |
a2fb1b05 | 2221 | |
730cdc88 ILT |
2222 | #ifdef HAVE_TARGET_32_LITTLE |
2223 | template | |
2224 | Output_section* | |
2225 | Layout::layout_eh_frame<32, false>(Sized_relobj<32, false>* object, | |
2226 | const unsigned char* symbols, | |
2227 | off_t symbols_size, | |
2228 | const unsigned char* symbol_names, | |
2229 | off_t symbol_names_size, | |
2230 | unsigned int shndx, | |
2231 | const elfcpp::Shdr<32, false>& shdr, | |
2232 | unsigned int reloc_shndx, | |
2233 | unsigned int reloc_type, | |
2234 | off_t* off); | |
2235 | #endif | |
2236 | ||
2237 | #ifdef HAVE_TARGET_32_BIG | |
2238 | template | |
2239 | Output_section* | |
2240 | Layout::layout_eh_frame<32, true>(Sized_relobj<32, true>* object, | |
2241 | const unsigned char* symbols, | |
2242 | off_t symbols_size, | |
2243 | const unsigned char* symbol_names, | |
2244 | off_t symbol_names_size, | |
2245 | unsigned int shndx, | |
2246 | const elfcpp::Shdr<32, true>& shdr, | |
2247 | unsigned int reloc_shndx, | |
2248 | unsigned int reloc_type, | |
2249 | off_t* off); | |
2250 | #endif | |
2251 | ||
2252 | #ifdef HAVE_TARGET_64_LITTLE | |
2253 | template | |
2254 | Output_section* | |
2255 | Layout::layout_eh_frame<64, false>(Sized_relobj<64, false>* object, | |
2256 | const unsigned char* symbols, | |
2257 | off_t symbols_size, | |
2258 | const unsigned char* symbol_names, | |
2259 | off_t symbol_names_size, | |
2260 | unsigned int shndx, | |
2261 | const elfcpp::Shdr<64, false>& shdr, | |
2262 | unsigned int reloc_shndx, | |
2263 | unsigned int reloc_type, | |
2264 | off_t* off); | |
2265 | #endif | |
2266 | ||
2267 | #ifdef HAVE_TARGET_64_BIG | |
2268 | template | |
2269 | Output_section* | |
2270 | Layout::layout_eh_frame<64, true>(Sized_relobj<64, true>* object, | |
2271 | const unsigned char* symbols, | |
2272 | off_t symbols_size, | |
2273 | const unsigned char* symbol_names, | |
2274 | off_t symbol_names_size, | |
2275 | unsigned int shndx, | |
2276 | const elfcpp::Shdr<64, true>& shdr, | |
2277 | unsigned int reloc_shndx, | |
2278 | unsigned int reloc_type, | |
2279 | off_t* off); | |
2280 | #endif | |
a2fb1b05 ILT |
2281 | |
2282 | } // End namespace gold. |