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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [gold/] [reloc.cc] - Blame information for rev 160

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// reloc.cc -- relocate input files for gold.
2
 
3
// Copyright 2006, 2007, 2008, 2009, 2010, 2011 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
 
23
#include "gold.h"
24
 
25
#include <algorithm>
26
 
27
#include "workqueue.h"
28
#include "layout.h"
29
#include "symtab.h"
30
#include "output.h"
31
#include "merge.h"
32
#include "object.h"
33
#include "target-reloc.h"
34
#include "reloc.h"
35
#include "icf.h"
36
#include "compressed_output.h"
37
#include "incremental.h"
38
 
39
namespace gold
40
{
41
 
42
// Read_relocs methods.
43
 
44
// These tasks just read the relocation information from the file.
45
// After reading it, the start another task to process the
46
// information.  These tasks requires access to the file.
47
 
48
Task_token*
49
Read_relocs::is_runnable()
50
{
51
  return this->object_->is_locked() ? this->object_->token() : NULL;
52
}
53
 
54
// Lock the file.
55
 
56
void
57
Read_relocs::locks(Task_locker* tl)
58
{
59
  Task_token* token = this->object_->token();
60
  if (token != NULL)
61
    tl->add(this, token);
62
}
63
 
64
// Read the relocations and then start a Scan_relocs_task.
65
 
66
void
67
Read_relocs::run(Workqueue* workqueue)
68
{
69
  Read_relocs_data* rd = new Read_relocs_data;
70
  this->object_->read_relocs(rd);
71
  this->object_->set_relocs_data(rd);
72
  this->object_->release();
73
 
74
  // If garbage collection or identical comdat folding is desired, we  
75
  // process the relocs first before scanning them.  Scanning of relocs is
76
  // done only after garbage or identical sections is identified.
77
  if (parameters->options().gc_sections()
78
      || parameters->options().icf_enabled())
79
    {
80
      workqueue->queue_next(new Gc_process_relocs(this->symtab_,
81
                                                  this->layout_,
82
                                                  this->object_, rd,
83
                                                  this->this_blocker_,
84
                                                  this->next_blocker_));
85
    }
86
  else
87
    {
88
      workqueue->queue_next(new Scan_relocs(this->symtab_, this->layout_,
89
                                            this->object_, rd,
90
                                            this->this_blocker_,
91
                                            this->next_blocker_));
92
    }
93
}
94
 
95
// Return a debugging name for the task.
96
 
97
std::string
98
Read_relocs::get_name() const
99
{
100
  return "Read_relocs " + this->object_->name();
101
}
102
 
103
// Gc_process_relocs methods.
104
 
105
Gc_process_relocs::~Gc_process_relocs()
106
{
107
  if (this->this_blocker_ != NULL)
108
    delete this->this_blocker_;
109
}
110
 
111
// These tasks process the relocations read by Read_relocs and
112
// determine which sections are referenced and which are garbage.
113
// This task is done only when --gc-sections is used.  This is blocked
114
// by THIS_BLOCKER_.  It unblocks NEXT_BLOCKER_.
115
 
116
Task_token*
117
Gc_process_relocs::is_runnable()
118
{
119
  if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
120
    return this->this_blocker_;
121
  if (this->object_->is_locked())
122
    return this->object_->token();
123
  return NULL;
124
}
125
 
126
void
127
Gc_process_relocs::locks(Task_locker* tl)
128
{
129
  tl->add(this, this->object_->token());
130
  tl->add(this, this->next_blocker_);
131
}
132
 
133
void
134
Gc_process_relocs::run(Workqueue*)
135
{
136
  this->object_->gc_process_relocs(this->symtab_, this->layout_, this->rd_);
137
  this->object_->release();
138
}
139
 
140
// Return a debugging name for the task.
141
 
142
std::string
143
Gc_process_relocs::get_name() const
144
{
145
  return "Gc_process_relocs " + this->object_->name();
146
}
147
 
148
// Scan_relocs methods.
149
 
150
Scan_relocs::~Scan_relocs()
151
{
152
  if (this->this_blocker_ != NULL)
153
    delete this->this_blocker_;
154
}
155
 
156
// These tasks scan the relocations read by Read_relocs and mark up
157
// the symbol table to indicate which relocations are required.  We
158
// use a lock on the symbol table to keep them from interfering with
159
// each other.
160
 
161
Task_token*
162
Scan_relocs::is_runnable()
163
{
164
  if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
165
    return this->this_blocker_;
166
  if (this->object_->is_locked())
167
    return this->object_->token();
168
  return NULL;
169
}
170
 
171
// Return the locks we hold: one on the file, one on the symbol table
172
// and one blocker.
173
 
174
void
175
Scan_relocs::locks(Task_locker* tl)
176
{
177
  Task_token* token = this->object_->token();
178
  if (token != NULL)
179
    tl->add(this, token);
180
  tl->add(this, this->next_blocker_);
181
}
182
 
183
// Scan the relocs.
184
 
185
void
186
Scan_relocs::run(Workqueue*)
187
{
188
  this->object_->scan_relocs(this->symtab_, this->layout_, this->rd_);
189
  delete this->rd_;
190
  this->rd_ = NULL;
191
  this->object_->release();
192
}
193
 
194
// Return a debugging name for the task.
195
 
196
std::string
197
Scan_relocs::get_name() const
198
{
199
  return "Scan_relocs " + this->object_->name();
200
}
201
 
202
// Relocate_task methods.
203
 
204
// We may have to wait for the output sections to be written.
205
 
206
Task_token*
207
Relocate_task::is_runnable()
208
{
209
  if (this->object_->relocs_must_follow_section_writes()
210
      && this->output_sections_blocker_->is_blocked())
211
    return this->output_sections_blocker_;
212
 
213
  if (this->object_->is_locked())
214
    return this->object_->token();
215
 
216
  return NULL;
217
}
218
 
219
// We want to lock the file while we run.  We want to unblock
220
// INPUT_SECTIONS_BLOCKER and FINAL_BLOCKER when we are done.
221
// INPUT_SECTIONS_BLOCKER may be NULL.
222
 
223
void
224
Relocate_task::locks(Task_locker* tl)
225
{
226
  if (this->input_sections_blocker_ != NULL)
227
    tl->add(this, this->input_sections_blocker_);
228
  tl->add(this, this->final_blocker_);
229
  Task_token* token = this->object_->token();
230
  if (token != NULL)
231
    tl->add(this, token);
232
}
233
 
234
// Run the task.
235
 
236
void
237
Relocate_task::run(Workqueue*)
238
{
239
  this->object_->relocate(this->symtab_, this->layout_, this->of_);
240
 
241
  // This is normally the last thing we will do with an object, so
242
  // uncache all views.
243
  this->object_->clear_view_cache_marks();
244
 
245
  this->object_->release();
246
}
247
 
248
// Return a debugging name for the task.
249
 
250
std::string
251
Relocate_task::get_name() const
252
{
253
  return "Relocate_task " + this->object_->name();
254
}
255
 
256
// Read the relocs and local symbols from the object file and store
257
// the information in RD.
258
 
259
template<int size, bool big_endian>
260
void
261
Sized_relobj_file<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
262
{
263
  rd->relocs.clear();
264
 
265
  unsigned int shnum = this->shnum();
266
  if (shnum == 0)
267
    return;
268
 
269
  rd->relocs.reserve(shnum / 2);
270
 
271
  const Output_sections& out_sections(this->output_sections());
272
  const std::vector<Address>& out_offsets(this->section_offsets());
273
 
274
  const unsigned char* pshdrs = this->get_view(this->elf_file_.shoff(),
275
                                               shnum * This::shdr_size,
276
                                               true, true);
277
  // Skip the first, dummy, section.
278
  const unsigned char* ps = pshdrs + This::shdr_size;
279
  for (unsigned int i = 1; i < shnum; ++i, ps += This::shdr_size)
280
    {
281
      typename This::Shdr shdr(ps);
282
 
283
      unsigned int sh_type = shdr.get_sh_type();
284
      if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
285
        continue;
286
 
287
      unsigned int shndx = this->adjust_shndx(shdr.get_sh_info());
288
      if (shndx >= shnum)
289
        {
290
          this->error(_("relocation section %u has bad info %u"),
291
                      i, shndx);
292
          continue;
293
        }
294
 
295
      Output_section* os = out_sections[shndx];
296
      if (os == NULL)
297
        continue;
298
 
299
      // We are scanning relocations in order to fill out the GOT and
300
      // PLT sections.  Relocations for sections which are not
301
      // allocated (typically debugging sections) should not add new
302
      // GOT and PLT entries.  So we skip them unless this is a
303
      // relocatable link or we need to emit relocations.  FIXME: What
304
      // should we do if a linker script maps a section with SHF_ALLOC
305
      // clear to a section with SHF_ALLOC set?
306
      typename This::Shdr secshdr(pshdrs + shndx * This::shdr_size);
307
      bool is_section_allocated = ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC)
308
                                   != 0);
309
      if (!is_section_allocated
310
          && !parameters->options().relocatable()
311
          && !parameters->options().emit_relocs()
312
          && !parameters->incremental())
313
        continue;
314
 
315
      if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx_)
316
        {
317
          this->error(_("relocation section %u uses unexpected "
318
                        "symbol table %u"),
319
                      i, this->adjust_shndx(shdr.get_sh_link()));
320
          continue;
321
        }
322
 
323
      off_t sh_size = shdr.get_sh_size();
324
 
325
      if (sh_size == 0)
326
        continue;
327
 
328
      unsigned int reloc_size;
329
      if (sh_type == elfcpp::SHT_REL)
330
        reloc_size = elfcpp::Elf_sizes<size>::rel_size;
331
      else
332
        reloc_size = elfcpp::Elf_sizes<size>::rela_size;
333
      if (reloc_size != shdr.get_sh_entsize())
334
        {
335
          this->error(_("unexpected entsize for reloc section %u: %lu != %u"),
336
                      i, static_cast<unsigned long>(shdr.get_sh_entsize()),
337
                      reloc_size);
338
          continue;
339
        }
340
 
341
      size_t reloc_count = sh_size / reloc_size;
342
      if (static_cast<off_t>(reloc_count * reloc_size) != sh_size)
343
        {
344
          this->error(_("reloc section %u size %lu uneven"),
345
                      i, static_cast<unsigned long>(sh_size));
346
          continue;
347
        }
348
 
349
      rd->relocs.push_back(Section_relocs());
350
      Section_relocs& sr(rd->relocs.back());
351
      sr.reloc_shndx = i;
352
      sr.data_shndx = shndx;
353
      sr.contents = this->get_lasting_view(shdr.get_sh_offset(), sh_size,
354
                                           true, true);
355
      sr.sh_type = sh_type;
356
      sr.reloc_count = reloc_count;
357
      sr.output_section = os;
358
      sr.needs_special_offset_handling = out_offsets[shndx] == invalid_address;
359
      sr.is_data_section_allocated = is_section_allocated;
360
    }
361
 
362
  // Read the local symbols.
363
  gold_assert(this->symtab_shndx_ != -1U);
364
  if (this->symtab_shndx_ == 0 || this->local_symbol_count_ == 0)
365
    rd->local_symbols = NULL;
366
  else
367
    {
368
      typename This::Shdr symtabshdr(pshdrs
369
                                     + this->symtab_shndx_ * This::shdr_size);
370
      gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
371
      const int sym_size = This::sym_size;
372
      const unsigned int loccount = this->local_symbol_count_;
373
      gold_assert(loccount == symtabshdr.get_sh_info());
374
      off_t locsize = loccount * sym_size;
375
      rd->local_symbols = this->get_lasting_view(symtabshdr.get_sh_offset(),
376
                                                 locsize, true, true);
377
    }
378
}
379
 
380
// Process the relocs to generate mappings from source sections to referenced
381
// sections.  This is used during garbage collection to determine garbage
382
// sections.
383
 
384
template<int size, bool big_endian>
385
void
386
Sized_relobj_file<size, big_endian>::do_gc_process_relocs(Symbol_table* symtab,
387
                                                          Layout* layout,
388
                                                          Read_relocs_data* rd)
389
{
390
  Sized_target<size, big_endian>* target =
391
    parameters->sized_target<size, big_endian>();
392
 
393
  const unsigned char* local_symbols;
394
  if (rd->local_symbols == NULL)
395
    local_symbols = NULL;
396
  else
397
    local_symbols = rd->local_symbols->data();
398
 
399
  for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
400
       p != rd->relocs.end();
401
       ++p)
402
    {
403
      if (!parameters->options().relocatable())
404
          {
405
            // As noted above, when not generating an object file, we
406
            // only scan allocated sections.  We may see a non-allocated
407
            // section here if we are emitting relocs.
408
            if (p->is_data_section_allocated)
409
              target->gc_process_relocs(symtab, layout, this,
410
                                        p->data_shndx, p->sh_type,
411
                                        p->contents->data(), p->reloc_count,
412
                                        p->output_section,
413
                                        p->needs_special_offset_handling,
414
                                        this->local_symbol_count_,
415
                                        local_symbols);
416
        }
417
    }
418
}
419
 
420
 
421
// Scan the relocs and adjust the symbol table.  This looks for
422
// relocations which require GOT/PLT/COPY relocations.
423
 
424
template<int size, bool big_endian>
425
void
426
Sized_relobj_file<size, big_endian>::do_scan_relocs(Symbol_table* symtab,
427
                                               Layout* layout,
428
                                               Read_relocs_data* rd)
429
{
430
  Sized_target<size, big_endian>* target =
431
    parameters->sized_target<size, big_endian>();
432
 
433
  const unsigned char* local_symbols;
434
  if (rd->local_symbols == NULL)
435
    local_symbols = NULL;
436
  else
437
    local_symbols = rd->local_symbols->data();
438
 
439
  // For incremental links, allocate the counters for incremental relocations.
440
  if (layout->incremental_inputs() != NULL)
441
    this->allocate_incremental_reloc_counts();
442
 
443
  for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
444
       p != rd->relocs.end();
445
       ++p)
446
    {
447
      // When garbage collection is on, unreferenced sections are not included
448
      // in the link that would have been included normally. This is known only
449
      // after Read_relocs hence this check has to be done again.
450
      if (parameters->options().gc_sections()
451
          || parameters->options().icf_enabled())
452
        {
453
          if (p->output_section == NULL)
454
            continue;
455
        }
456
      if (!parameters->options().relocatable())
457
        {
458
          // As noted above, when not generating an object file, we
459
          // only scan allocated sections.  We may see a non-allocated
460
          // section here if we are emitting relocs.
461
          if (p->is_data_section_allocated)
462
            target->scan_relocs(symtab, layout, this, p->data_shndx,
463
                                p->sh_type, p->contents->data(),
464
                                p->reloc_count, p->output_section,
465
                                p->needs_special_offset_handling,
466
                                this->local_symbol_count_,
467
                                local_symbols);
468
          if (parameters->options().emit_relocs())
469
            this->emit_relocs_scan(symtab, layout, local_symbols, p);
470
          if (layout->incremental_inputs() != NULL)
471
            this->incremental_relocs_scan(p);
472
        }
473
      else
474
        {
475
          Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
476
          gold_assert(rr != NULL);
477
          rr->set_reloc_count(p->reloc_count);
478
          target->scan_relocatable_relocs(symtab, layout, this,
479
                                          p->data_shndx, p->sh_type,
480
                                          p->contents->data(),
481
                                          p->reloc_count,
482
                                          p->output_section,
483
                                          p->needs_special_offset_handling,
484
                                          this->local_symbol_count_,
485
                                          local_symbols,
486
                                          rr);
487
        }
488
 
489
      delete p->contents;
490
      p->contents = NULL;
491
    }
492
 
493
  // For incremental links, finalize the allocation of relocations.
494
  if (layout->incremental_inputs() != NULL)
495
    this->finalize_incremental_relocs(layout, true);
496
 
497
  if (rd->local_symbols != NULL)
498
    {
499
      delete rd->local_symbols;
500
      rd->local_symbols = NULL;
501
    }
502
}
503
 
504
// This is a strategy class we use when scanning for --emit-relocs.
505
 
506
template<int sh_type>
507
class Emit_relocs_strategy
508
{
509
 public:
510
  // A local non-section symbol.
511
  inline Relocatable_relocs::Reloc_strategy
512
  local_non_section_strategy(unsigned int, Relobj*, unsigned int)
513
  { return Relocatable_relocs::RELOC_COPY; }
514
 
515
  // A local section symbol.
516
  inline Relocatable_relocs::Reloc_strategy
517
  local_section_strategy(unsigned int, Relobj*)
518
  {
519
    if (sh_type == elfcpp::SHT_RELA)
520
      return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
521
    else
522
      {
523
        // The addend is stored in the section contents.  Since this
524
        // is not a relocatable link, we are going to apply the
525
        // relocation contents to the section as usual.  This means
526
        // that we have no way to record the original addend.  If the
527
        // original addend is not zero, there is basically no way for
528
        // the user to handle this correctly.  Caveat emptor.
529
        return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0;
530
      }
531
  }
532
 
533
  // A global symbol.
534
  inline Relocatable_relocs::Reloc_strategy
535
  global_strategy(unsigned int, Relobj*, unsigned int)
536
  { return Relocatable_relocs::RELOC_COPY; }
537
};
538
 
539
// Scan the input relocations for --emit-relocs.
540
 
541
template<int size, bool big_endian>
542
void
543
Sized_relobj_file<size, big_endian>::emit_relocs_scan(
544
    Symbol_table* symtab,
545
    Layout* layout,
546
    const unsigned char* plocal_syms,
547
    const Read_relocs_data::Relocs_list::iterator& p)
548
{
549
  Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
550
  gold_assert(rr != NULL);
551
  rr->set_reloc_count(p->reloc_count);
552
 
553
  if (p->sh_type == elfcpp::SHT_REL)
554
    this->emit_relocs_scan_reltype<elfcpp::SHT_REL>(symtab, layout,
555
                                                    plocal_syms, p, rr);
556
  else
557
    {
558
      gold_assert(p->sh_type == elfcpp::SHT_RELA);
559
      this->emit_relocs_scan_reltype<elfcpp::SHT_RELA>(symtab, layout,
560
                                                       plocal_syms, p, rr);
561
    }
562
}
563
 
564
// Scan the input relocation for --emit-relocs, templatized on the
565
// type of the relocation section.
566
 
567
template<int size, bool big_endian>
568
template<int sh_type>
569
void
570
Sized_relobj_file<size, big_endian>::emit_relocs_scan_reltype(
571
    Symbol_table* symtab,
572
    Layout* layout,
573
    const unsigned char* plocal_syms,
574
    const Read_relocs_data::Relocs_list::iterator& p,
575
    Relocatable_relocs* rr)
576
{
577
  scan_relocatable_relocs<size, big_endian, sh_type,
578
                          Emit_relocs_strategy<sh_type> >(
579
    symtab,
580
    layout,
581
    this,
582
    p->data_shndx,
583
    p->contents->data(),
584
    p->reloc_count,
585
    p->output_section,
586
    p->needs_special_offset_handling,
587
    this->local_symbol_count_,
588
    plocal_syms,
589
    rr);
590
}
591
 
592
// Scan the input relocations for --incremental.
593
 
594
template<int size, bool big_endian>
595
void
596
Sized_relobj_file<size, big_endian>::incremental_relocs_scan(
597
    const Read_relocs_data::Relocs_list::iterator& p)
598
{
599
  if (p->sh_type == elfcpp::SHT_REL)
600
    this->incremental_relocs_scan_reltype<elfcpp::SHT_REL>(p);
601
  else
602
    {
603
      gold_assert(p->sh_type == elfcpp::SHT_RELA);
604
      this->incremental_relocs_scan_reltype<elfcpp::SHT_RELA>(p);
605
    }
606
}
607
 
608
// Scan the input relocation for --incremental, templatized on the
609
// type of the relocation section.
610
 
611
template<int size, bool big_endian>
612
template<int sh_type>
613
void
614
Sized_relobj_file<size, big_endian>::incremental_relocs_scan_reltype(
615
    const Read_relocs_data::Relocs_list::iterator& p)
616
{
617
  typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
618
  const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
619
  const unsigned char* prelocs = p->contents->data();
620
  size_t reloc_count = p->reloc_count;
621
 
622
  for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
623
    {
624
      Reltype reloc(prelocs);
625
 
626
      if (p->needs_special_offset_handling
627
          && !p->output_section->is_input_address_mapped(this, p->data_shndx,
628
                                                         reloc.get_r_offset()))
629
        continue;
630
 
631
      typename elfcpp::Elf_types<size>::Elf_WXword r_info =
632
          reloc.get_r_info();
633
      const unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
634
 
635
      if (r_sym >= this->local_symbol_count_)
636
        this->count_incremental_reloc(r_sym - this->local_symbol_count_);
637
    }
638
}
639
 
640
// Relocate the input sections and write out the local symbols.
641
 
642
template<int size, bool big_endian>
643
void
644
Sized_relobj_file<size, big_endian>::do_relocate(const Symbol_table* symtab,
645
                                                 const Layout* layout,
646
                                                 Output_file* of)
647
{
648
  unsigned int shnum = this->shnum();
649
 
650
  // Read the section headers.
651
  const unsigned char* pshdrs = this->get_view(this->elf_file_.shoff(),
652
                                               shnum * This::shdr_size,
653
                                               true, true);
654
 
655
  Views views;
656
  views.resize(shnum);
657
 
658
  // Make two passes over the sections.  The first one copies the
659
  // section data to the output file.  The second one applies
660
  // relocations.
661
 
662 159 khays
  this->write_sections(layout, pshdrs, of, &views);
663 27 khays
 
664
  // To speed up relocations, we set up hash tables for fast lookup of
665
  // input offsets to output addresses.
666
  this->initialize_input_to_output_maps();
667
 
668
  // Apply relocations.
669
 
670
  this->relocate_sections(symtab, layout, pshdrs, of, &views);
671
 
672
  // After we've done the relocations, we release the hash tables,
673
  // since we no longer need them.
674
  this->free_input_to_output_maps();
675
 
676
  // Write out the accumulated views.
677
  for (unsigned int i = 1; i < shnum; ++i)
678
    {
679
      if (views[i].view != NULL)
680
        {
681 159 khays
          if (views[i].is_ctors_reverse_view)
682
            this->reverse_words(views[i].view, views[i].view_size);
683 27 khays
          if (!views[i].is_postprocessing_view)
684
            {
685
              if (views[i].is_input_output_view)
686
                of->write_input_output_view(views[i].offset,
687
                                            views[i].view_size,
688
                                            views[i].view);
689
              else
690
                of->write_output_view(views[i].offset, views[i].view_size,
691
                                      views[i].view);
692
            }
693
        }
694
    }
695
 
696
  // Write out the local symbols.
697
  this->write_local_symbols(of, layout->sympool(), layout->dynpool(),
698
                            layout->symtab_xindex(), layout->dynsym_xindex(),
699
                            layout->symtab_section_offset());
700
}
701
 
702
// Sort a Read_multiple vector by file offset.
703
struct Read_multiple_compare
704
{
705
  inline bool
706
  operator()(const File_read::Read_multiple_entry& rme1,
707
             const File_read::Read_multiple_entry& rme2) const
708
  { return rme1.file_offset < rme2.file_offset; }
709
};
710
 
711
// Write section data to the output file.  PSHDRS points to the
712
// section headers.  Record the views in *PVIEWS for use when
713
// relocating.
714
 
715
template<int size, bool big_endian>
716
void
717 159 khays
Sized_relobj_file<size, big_endian>::write_sections(const Layout* layout,
718
                                                    const unsigned char* pshdrs,
719 27 khays
                                                    Output_file* of,
720
                                                    Views* pviews)
721
{
722
  unsigned int shnum = this->shnum();
723
  const Output_sections& out_sections(this->output_sections());
724
  const std::vector<Address>& out_offsets(this->section_offsets());
725
 
726
  File_read::Read_multiple rm;
727
  bool is_sorted = true;
728
 
729
  const unsigned char* p = pshdrs + This::shdr_size;
730
  for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
731
    {
732
      View_size* pvs = &(*pviews)[i];
733
 
734
      pvs->view = NULL;
735
 
736
      const Output_section* os = out_sections[i];
737
      if (os == NULL)
738
        continue;
739
      Address output_offset = out_offsets[i];
740
 
741
      typename This::Shdr shdr(p);
742
 
743
      if (shdr.get_sh_type() == elfcpp::SHT_NOBITS)
744
        continue;
745
 
746
      if ((parameters->options().relocatable()
747
           || parameters->options().emit_relocs())
748
          && (shdr.get_sh_type() == elfcpp::SHT_REL
749
              || shdr.get_sh_type() == elfcpp::SHT_RELA)
750
          && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
751
        {
752
          // This is a reloc section in a relocatable link or when
753
          // emitting relocs.  We don't need to read the input file.
754
          // The size and file offset are stored in the
755
          // Relocatable_relocs structure.
756
          Relocatable_relocs* rr = this->relocatable_relocs(i);
757
          gold_assert(rr != NULL);
758
          Output_data* posd = rr->output_data();
759
          gold_assert(posd != NULL);
760
 
761
          pvs->offset = posd->offset();
762
          pvs->view_size = posd->data_size();
763
          pvs->view = of->get_output_view(pvs->offset, pvs->view_size);
764
          pvs->address = posd->address();
765
          pvs->is_input_output_view = false;
766
          pvs->is_postprocessing_view = false;
767 159 khays
          pvs->is_ctors_reverse_view = false;
768 27 khays
 
769
          continue;
770
        }
771
 
772
      // In the normal case, this input section is simply mapped to
773
      // the output section at offset OUTPUT_OFFSET.
774
 
775
      // However, if OUTPUT_OFFSET == INVALID_ADDRESS, then input data is
776
      // handled specially--e.g., a .eh_frame section.  The relocation
777
      // routines need to check for each reloc where it should be
778
      // applied.  For this case, we need an input/output view for the
779
      // entire contents of the section in the output file.  We don't
780
      // want to copy the contents of the input section to the output
781
      // section; the output section contents were already written,
782
      // and we waited for them in Relocate_task::is_runnable because
783
      // relocs_must_follow_section_writes is set for the object.
784
 
785
      // Regardless of which of the above cases is true, we have to
786
      // check requires_postprocessing of the output section.  If that
787
      // is false, then we work with views of the output file
788
      // directly.  If it is true, then we work with a separate
789
      // buffer, and the output section is responsible for writing the
790
      // final data to the output file.
791
 
792
      off_t output_section_offset;
793
      Address output_section_size;
794
      if (!os->requires_postprocessing())
795
        {
796
          output_section_offset = os->offset();
797
          output_section_size = convert_types<Address, off_t>(os->data_size());
798
        }
799
      else
800
        {
801
          output_section_offset = 0;
802
          output_section_size =
803
              convert_types<Address, off_t>(os->postprocessing_buffer_size());
804
        }
805
 
806
      off_t view_start;
807
      section_size_type view_size;
808
      bool must_decompress = false;
809
      if (output_offset != invalid_address)
810
        {
811
          view_start = output_section_offset + output_offset;
812
          view_size = convert_to_section_size_type(shdr.get_sh_size());
813
          section_size_type uncompressed_size;
814
          if (this->section_is_compressed(i, &uncompressed_size))
815
            {
816
              view_size = uncompressed_size;
817
              must_decompress = true;
818
            }
819
        }
820
      else
821
        {
822
          view_start = output_section_offset;
823
          view_size = convert_to_section_size_type(output_section_size);
824
        }
825
 
826
      if (view_size == 0)
827
        continue;
828
 
829
      gold_assert(output_offset == invalid_address
830
                  || output_offset + view_size <= output_section_size);
831
 
832
      unsigned char* view;
833
      if (os->requires_postprocessing())
834
        {
835
          unsigned char* buffer = os->postprocessing_buffer();
836
          view = buffer + view_start;
837
          if (output_offset != invalid_address && !must_decompress)
838
            {
839
              off_t sh_offset = shdr.get_sh_offset();
840
              if (!rm.empty() && rm.back().file_offset > sh_offset)
841
                is_sorted = false;
842
              rm.push_back(File_read::Read_multiple_entry(sh_offset,
843
                                                          view_size, view));
844
            }
845
        }
846
      else
847
        {
848
          if (output_offset == invalid_address)
849
            view = of->get_input_output_view(view_start, view_size);
850
          else
851
            {
852
              view = of->get_output_view(view_start, view_size);
853
              if (!must_decompress)
854
                {
855
                  off_t sh_offset = shdr.get_sh_offset();
856
                  if (!rm.empty() && rm.back().file_offset > sh_offset)
857
                    is_sorted = false;
858
                  rm.push_back(File_read::Read_multiple_entry(sh_offset,
859
                                                              view_size, view));
860
                }
861
            }
862
        }
863
 
864
      if (must_decompress)
865
        {
866
          // Read and decompress the section.
867
          section_size_type len;
868
          const unsigned char* p = this->section_contents(i, &len, false);
869
          if (!decompress_input_section(p, len, view, view_size))
870
            this->error(_("could not decompress section %s"),
871
                        this->section_name(i).c_str());
872
        }
873
 
874
      pvs->view = view;
875
      pvs->address = os->address();
876
      if (output_offset != invalid_address)
877
        pvs->address += output_offset;
878
      pvs->offset = view_start;
879
      pvs->view_size = view_size;
880
      pvs->is_input_output_view = output_offset == invalid_address;
881
      pvs->is_postprocessing_view = os->requires_postprocessing();
882 159 khays
      pvs->is_ctors_reverse_view =
883
        (!parameters->options().relocatable()
884
         && view_size > size / 8
885
         && (strcmp(os->name(), ".init_array") == 0
886
             || strcmp(os->name(), ".fini_array") == 0)
887
         && layout->is_ctors_in_init_array(this, i));
888 27 khays
    }
889
 
890
  // Actually read the data.
891
  if (!rm.empty())
892
    {
893
      if (!is_sorted)
894
        std::sort(rm.begin(), rm.end(), Read_multiple_compare());
895
      this->read_multiple(rm);
896
    }
897
}
898
 
899
// Relocate section data.  VIEWS points to the section data as views
900
// in the output file.
901
 
902
template<int size, bool big_endian>
903
void
904
Sized_relobj_file<size, big_endian>::do_relocate_sections(
905
    const Symbol_table* symtab,
906
    const Layout* layout,
907
    const unsigned char* pshdrs,
908
    Output_file* of,
909
    Views* pviews)
910
{
911
  unsigned int shnum = this->shnum();
912
  Sized_target<size, big_endian>* target =
913
    parameters->sized_target<size, big_endian>();
914
 
915
  const Output_sections& out_sections(this->output_sections());
916
  const std::vector<Address>& out_offsets(this->section_offsets());
917
 
918
  Relocate_info<size, big_endian> relinfo;
919
  relinfo.symtab = symtab;
920
  relinfo.layout = layout;
921
  relinfo.object = this;
922
 
923
  const unsigned char* p = pshdrs + This::shdr_size;
924
  for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
925
    {
926
      typename This::Shdr shdr(p);
927
 
928
      unsigned int sh_type = shdr.get_sh_type();
929
      if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
930
        continue;
931
 
932
      off_t sh_size = shdr.get_sh_size();
933
      if (sh_size == 0)
934
        continue;
935
 
936
      unsigned int index = this->adjust_shndx(shdr.get_sh_info());
937
      if (index >= this->shnum())
938
        {
939
          this->error(_("relocation section %u has bad info %u"),
940
                      i, index);
941
          continue;
942
        }
943
 
944
      Output_section* os = out_sections[index];
945
      if (os == NULL)
946
        {
947
          // This relocation section is against a section which we
948
          // discarded.
949
          continue;
950
        }
951
      Address output_offset = out_offsets[index];
952
 
953
      gold_assert((*pviews)[index].view != NULL);
954
      if (parameters->options().relocatable())
955
        gold_assert((*pviews)[i].view != NULL);
956
 
957
      if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx_)
958
        {
959
          gold_error(_("relocation section %u uses unexpected "
960
                       "symbol table %u"),
961
                     i, this->adjust_shndx(shdr.get_sh_link()));
962
          continue;
963
        }
964
 
965
      const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
966
                                                    sh_size, true, false);
967
 
968
      unsigned int reloc_size;
969
      if (sh_type == elfcpp::SHT_REL)
970
        reloc_size = elfcpp::Elf_sizes<size>::rel_size;
971
      else
972
        reloc_size = elfcpp::Elf_sizes<size>::rela_size;
973
 
974
      if (reloc_size != shdr.get_sh_entsize())
975
        {
976
          gold_error(_("unexpected entsize for reloc section %u: %lu != %u"),
977
                     i, static_cast<unsigned long>(shdr.get_sh_entsize()),
978
                     reloc_size);
979
          continue;
980
        }
981
 
982
      size_t reloc_count = sh_size / reloc_size;
983
      if (static_cast<off_t>(reloc_count * reloc_size) != sh_size)
984
        {
985
          gold_error(_("reloc section %u size %lu uneven"),
986
                     i, static_cast<unsigned long>(sh_size));
987
          continue;
988
        }
989
 
990
      gold_assert(output_offset != invalid_address
991
                  || this->relocs_must_follow_section_writes());
992
 
993
      relinfo.reloc_shndx = i;
994
      relinfo.reloc_shdr = p;
995
      relinfo.data_shndx = index;
996
      relinfo.data_shdr = pshdrs + index * This::shdr_size;
997
      unsigned char* view = (*pviews)[index].view;
998
      Address address = (*pviews)[index].address;
999
      section_size_type view_size = (*pviews)[index].view_size;
1000
 
1001
      Reloc_symbol_changes* reloc_map = NULL;
1002
      if (this->uses_split_stack() && output_offset != invalid_address)
1003
        {
1004
          typename This::Shdr data_shdr(pshdrs + index * This::shdr_size);
1005
          if ((data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0)
1006
            this->split_stack_adjust(symtab, pshdrs, sh_type, index,
1007
                                     prelocs, reloc_count, view, view_size,
1008
                                     &reloc_map);
1009
        }
1010
 
1011
      if (!parameters->options().relocatable())
1012
        {
1013
          target->relocate_section(&relinfo, sh_type, prelocs, reloc_count, os,
1014
                                   output_offset == invalid_address,
1015
                                   view, address, view_size, reloc_map);
1016
          if (parameters->options().emit_relocs())
1017
            this->emit_relocs(&relinfo, i, sh_type, prelocs, reloc_count,
1018
                              os, output_offset, view, address, view_size,
1019
                              (*pviews)[i].view, (*pviews)[i].view_size);
1020
          if (parameters->incremental())
1021
            this->incremental_relocs_write(&relinfo, sh_type, prelocs,
1022
                                           reloc_count, os, output_offset, of);
1023
        }
1024
      else
1025
        {
1026
          Relocatable_relocs* rr = this->relocatable_relocs(i);
1027
          target->relocate_for_relocatable(&relinfo, sh_type, prelocs,
1028
                                           reloc_count, os, output_offset, rr,
1029
                                           view, address, view_size,
1030
                                           (*pviews)[i].view,
1031
                                           (*pviews)[i].view_size);
1032
        }
1033
    }
1034
}
1035
 
1036
// Emit the relocs for --emit-relocs.
1037
 
1038
template<int size, bool big_endian>
1039
void
1040
Sized_relobj_file<size, big_endian>::emit_relocs(
1041
    const Relocate_info<size, big_endian>* relinfo,
1042
    unsigned int i,
1043
    unsigned int sh_type,
1044
    const unsigned char* prelocs,
1045
    size_t reloc_count,
1046
    Output_section* output_section,
1047
    typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section,
1048
    unsigned char* view,
1049
    typename elfcpp::Elf_types<size>::Elf_Addr address,
1050
    section_size_type view_size,
1051
    unsigned char* reloc_view,
1052
    section_size_type reloc_view_size)
1053
{
1054
  if (sh_type == elfcpp::SHT_REL)
1055
    this->emit_relocs_reltype<elfcpp::SHT_REL>(relinfo, i, prelocs,
1056
                                               reloc_count, output_section,
1057
                                               offset_in_output_section,
1058
                                               view, address, view_size,
1059
                                               reloc_view, reloc_view_size);
1060
  else
1061
    {
1062
      gold_assert(sh_type == elfcpp::SHT_RELA);
1063
      this->emit_relocs_reltype<elfcpp::SHT_RELA>(relinfo, i, prelocs,
1064
                                                  reloc_count, output_section,
1065
                                                  offset_in_output_section,
1066
                                                  view, address, view_size,
1067
                                                  reloc_view, reloc_view_size);
1068
    }
1069
}
1070
 
1071
// Emit the relocs for --emit-relocs, templatized on the type of the
1072
// relocation section.
1073
 
1074
template<int size, bool big_endian>
1075
template<int sh_type>
1076
void
1077
Sized_relobj_file<size, big_endian>::emit_relocs_reltype(
1078
    const Relocate_info<size, big_endian>* relinfo,
1079
    unsigned int i,
1080
    const unsigned char* prelocs,
1081
    size_t reloc_count,
1082
    Output_section* output_section,
1083
    typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section,
1084
    unsigned char* view,
1085
    typename elfcpp::Elf_types<size>::Elf_Addr address,
1086
    section_size_type view_size,
1087
    unsigned char* reloc_view,
1088
    section_size_type reloc_view_size)
1089
{
1090
  const Relocatable_relocs* rr = this->relocatable_relocs(i);
1091
  relocate_for_relocatable<size, big_endian, sh_type>(
1092
    relinfo,
1093
    prelocs,
1094
    reloc_count,
1095
    output_section,
1096
    offset_in_output_section,
1097
    rr,
1098
    view,
1099
    address,
1100
    view_size,
1101
    reloc_view,
1102
    reloc_view_size);
1103
}
1104
 
1105
// Write the incremental relocs.
1106
 
1107
template<int size, bool big_endian>
1108
void
1109
Sized_relobj_file<size, big_endian>::incremental_relocs_write(
1110
    const Relocate_info<size, big_endian>* relinfo,
1111
    unsigned int sh_type,
1112
    const unsigned char* prelocs,
1113
    size_t reloc_count,
1114
    Output_section* output_section,
1115
    Address output_offset,
1116
    Output_file* of)
1117
{
1118
  if (sh_type == elfcpp::SHT_REL)
1119
    this->incremental_relocs_write_reltype<elfcpp::SHT_REL>(
1120
        relinfo,
1121
        prelocs,
1122
        reloc_count,
1123
        output_section,
1124
        output_offset,
1125
        of);
1126
  else
1127
    {
1128
      gold_assert(sh_type == elfcpp::SHT_RELA);
1129
      this->incremental_relocs_write_reltype<elfcpp::SHT_RELA>(
1130
          relinfo,
1131
          prelocs,
1132
          reloc_count,
1133
          output_section,
1134
          output_offset,
1135
          of);
1136
    }
1137
}
1138
 
1139
// Write the incremental relocs, templatized on the type of the
1140
// relocation section.
1141
 
1142
template<int size, bool big_endian>
1143
template<int sh_type>
1144
void
1145
Sized_relobj_file<size, big_endian>::incremental_relocs_write_reltype(
1146
    const Relocate_info<size, big_endian>* relinfo,
1147
    const unsigned char* prelocs,
1148
    size_t reloc_count,
1149
    Output_section* output_section,
1150
    Address output_offset,
1151
    Output_file* of)
1152
{
1153
  typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reloc;
1154
  const unsigned int reloc_size =
1155
      Reloc_types<sh_type, size, big_endian>::reloc_size;
1156
  const unsigned int sizeof_addr = size / 8;
1157
  const unsigned int incr_reloc_size =
1158
      Incremental_relocs_reader<size, big_endian>::reloc_size;
1159
 
1160
  unsigned int out_shndx = output_section->out_shndx();
1161
 
1162
  // Get a view for the .gnu_incremental_relocs section.
1163
 
1164
  Incremental_inputs* inputs = relinfo->layout->incremental_inputs();
1165
  gold_assert(inputs != NULL);
1166
  const off_t relocs_off = inputs->relocs_section()->offset();
1167
  const off_t relocs_size = inputs->relocs_section()->data_size();
1168
  unsigned char* const view = of->get_output_view(relocs_off, relocs_size);
1169
 
1170
  for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
1171
    {
1172
      Reloc reloc(prelocs);
1173
 
1174
      typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
1175
      const unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
1176
      const unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
1177
 
1178
      if (r_sym < this->local_symbol_count_)
1179
        continue;
1180
 
1181
      // Get the new offset--the location in the output section where
1182
      // this relocation should be applied.
1183
 
1184
      Address offset = reloc.get_r_offset();
1185
      if (output_offset != invalid_address)
1186
        offset += output_offset;
1187
      else
1188
        {
1189
          section_offset_type sot_offset =
1190
              convert_types<section_offset_type, Address>(offset);
1191
          section_offset_type new_sot_offset =
1192
              output_section->output_offset(relinfo->object,
1193
                                            relinfo->data_shndx,
1194
                                            sot_offset);
1195
          gold_assert(new_sot_offset != -1);
1196
          offset += new_sot_offset;
1197
        }
1198
 
1199
      // Get the addend.
1200
      typename elfcpp::Elf_types<size>::Elf_Swxword addend;
1201
      if (sh_type == elfcpp::SHT_RELA)
1202
        addend =
1203
            Reloc_types<sh_type, size, big_endian>::get_reloc_addend(&reloc);
1204
      else
1205
        {
1206
          // FIXME: Get the addend for SHT_REL.
1207
          addend = 0;
1208
        }
1209
 
1210
      // Get the index of the output relocation.
1211
 
1212
      unsigned int reloc_index =
1213
          this->next_incremental_reloc_index(r_sym - this->local_symbol_count_);
1214
 
1215
      // Write the relocation.
1216
 
1217
      unsigned char* pov = view + reloc_index * incr_reloc_size;
1218
      elfcpp::Swap<32, big_endian>::writeval(pov, r_type);
1219
      elfcpp::Swap<32, big_endian>::writeval(pov + 4, out_shndx);
1220
      elfcpp::Swap<size, big_endian>::writeval(pov + 8, offset);
1221
      elfcpp::Swap<size, big_endian>::writeval(pov + 8 + sizeof_addr, addend);
1222
      of->write_output_view(pov - view, incr_reloc_size, view);
1223
    }
1224
}
1225
 
1226
// Create merge hash tables for the local symbols.  These are used to
1227
// speed up relocations.
1228
 
1229
template<int size, bool big_endian>
1230
void
1231
Sized_relobj_file<size, big_endian>::initialize_input_to_output_maps()
1232
{
1233
  const unsigned int loccount = this->local_symbol_count_;
1234
  for (unsigned int i = 1; i < loccount; ++i)
1235
    {
1236
      Symbol_value<size>& lv(this->local_values_[i]);
1237
      lv.initialize_input_to_output_map(this);
1238
    }
1239
}
1240
 
1241
// Free merge hash tables for the local symbols.
1242
 
1243
template<int size, bool big_endian>
1244
void
1245
Sized_relobj_file<size, big_endian>::free_input_to_output_maps()
1246
{
1247
  const unsigned int loccount = this->local_symbol_count_;
1248
  for (unsigned int i = 1; i < loccount; ++i)
1249
    {
1250
      Symbol_value<size>& lv(this->local_values_[i]);
1251
      lv.free_input_to_output_map();
1252
    }
1253
}
1254
 
1255
// If an object was compiled with -fsplit-stack, this is called to
1256
// check whether any relocations refer to functions defined in objects
1257
// which were not compiled with -fsplit-stack.  If they were, then we
1258
// need to apply some target-specific adjustments to request
1259
// additional stack space.
1260
 
1261
template<int size, bool big_endian>
1262
void
1263
Sized_relobj_file<size, big_endian>::split_stack_adjust(
1264
    const Symbol_table* symtab,
1265
    const unsigned char* pshdrs,
1266
    unsigned int sh_type,
1267
    unsigned int shndx,
1268
    const unsigned char* prelocs,
1269
    size_t reloc_count,
1270
    unsigned char* view,
1271
    section_size_type view_size,
1272
    Reloc_symbol_changes** reloc_map)
1273
{
1274
  if (sh_type == elfcpp::SHT_REL)
1275
    this->split_stack_adjust_reltype<elfcpp::SHT_REL>(symtab, pshdrs, shndx,
1276
                                                      prelocs, reloc_count,
1277
                                                      view, view_size,
1278
                                                      reloc_map);
1279
  else
1280
    {
1281
      gold_assert(sh_type == elfcpp::SHT_RELA);
1282
      this->split_stack_adjust_reltype<elfcpp::SHT_RELA>(symtab, pshdrs, shndx,
1283
                                                         prelocs, reloc_count,
1284
                                                         view, view_size,
1285
                                                         reloc_map);
1286
    }
1287
}
1288
 
1289
// Adjust for -fsplit-stack, templatized on the type of the relocation
1290
// section.
1291
 
1292
template<int size, bool big_endian>
1293
template<int sh_type>
1294
void
1295
Sized_relobj_file<size, big_endian>::split_stack_adjust_reltype(
1296
    const Symbol_table* symtab,
1297
    const unsigned char* pshdrs,
1298
    unsigned int shndx,
1299
    const unsigned char* prelocs,
1300
    size_t reloc_count,
1301
    unsigned char* view,
1302
    section_size_type view_size,
1303
    Reloc_symbol_changes** reloc_map)
1304
{
1305
  typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
1306
  const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
1307
 
1308
  size_t local_count = this->local_symbol_count();
1309
 
1310
  std::vector<section_offset_type> non_split_refs;
1311
 
1312
  const unsigned char* pr = prelocs;
1313
  for (size_t i = 0; i < reloc_count; ++i, pr += reloc_size)
1314
    {
1315
      Reltype reloc(pr);
1316
 
1317
      typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
1318
      unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
1319
      if (r_sym < local_count)
1320
        continue;
1321
 
1322
      const Symbol* gsym = this->global_symbol(r_sym);
1323
      gold_assert(gsym != NULL);
1324
      if (gsym->is_forwarder())
1325
        gsym = symtab->resolve_forwards(gsym);
1326
 
1327
      // See if this relocation refers to a function defined in an
1328
      // object compiled without -fsplit-stack.  Note that we don't
1329
      // care about the type of relocation--this means that in some
1330
      // cases we will ask for a large stack unnecessarily, but this
1331
      // is not fatal.  FIXME: Some targets have symbols which are
1332
      // functions but are not type STT_FUNC, e.g., STT_ARM_TFUNC.
1333
      if (!gsym->is_undefined()
1334
          && gsym->source() == Symbol::FROM_OBJECT
1335
          && !gsym->object()->uses_split_stack())
1336
        {
1337
          unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
1338
          if (parameters->target().is_call_to_non_split(gsym, r_type))
1339
            {
1340
              section_offset_type offset =
1341
                convert_to_section_size_type(reloc.get_r_offset());
1342
              non_split_refs.push_back(offset);
1343
            }
1344
        }
1345
    }
1346
 
1347
  if (non_split_refs.empty())
1348
    return;
1349
 
1350
  // At this point, every entry in NON_SPLIT_REFS indicates a
1351
  // relocation which refers to a function in an object compiled
1352
  // without -fsplit-stack.  We now have to convert that list into a
1353
  // set of offsets to functions.  First, we find all the functions.
1354
 
1355
  Function_offsets function_offsets;
1356
  this->find_functions(pshdrs, shndx, &function_offsets);
1357
  if (function_offsets.empty())
1358
    return;
1359
 
1360
  // Now get a list of the function with references to non split-stack
1361
  // code.
1362
 
1363
  Function_offsets calls_non_split;
1364
  for (std::vector<section_offset_type>::const_iterator p
1365
         = non_split_refs.begin();
1366
       p != non_split_refs.end();
1367
       ++p)
1368
    {
1369
      Function_offsets::const_iterator low = function_offsets.lower_bound(*p);
1370
      if (low == function_offsets.end())
1371
        --low;
1372
      else if (low->first == *p)
1373
        ;
1374
      else if (low == function_offsets.begin())
1375
        continue;
1376
      else
1377
        --low;
1378
 
1379
      calls_non_split.insert(*low);
1380
    }
1381
  if (calls_non_split.empty())
1382
    return;
1383
 
1384
  // Now we have a set of functions to adjust.  The adjustments are
1385
  // target specific.  Besides changing the output section view
1386
  // however, it likes, the target may request a relocation change
1387
  // from one global symbol name to another.
1388
 
1389
  for (Function_offsets::const_iterator p = calls_non_split.begin();
1390
       p != calls_non_split.end();
1391
       ++p)
1392
    {
1393
      std::string from;
1394
      std::string to;
1395
      parameters->target().calls_non_split(this, shndx, p->first, p->second,
1396
                                           view, view_size, &from, &to);
1397
      if (!from.empty())
1398
        {
1399
          gold_assert(!to.empty());
1400
          Symbol* tosym = NULL;
1401
 
1402
          // Find relocations in the relevant function which are for
1403
          // FROM.
1404
          pr = prelocs;
1405
          for (size_t i = 0; i < reloc_count; ++i, pr += reloc_size)
1406
            {
1407
              Reltype reloc(pr);
1408
 
1409
              typename elfcpp::Elf_types<size>::Elf_WXword r_info =
1410
                reloc.get_r_info();
1411
              unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
1412
              if (r_sym < local_count)
1413
                continue;
1414
 
1415
              section_offset_type offset =
1416
                convert_to_section_size_type(reloc.get_r_offset());
1417
              if (offset < p->first
1418
                  || (offset
1419
                      >= (p->first
1420
                          + static_cast<section_offset_type>(p->second))))
1421
                continue;
1422
 
1423
              const Symbol* gsym = this->global_symbol(r_sym);
1424
              if (from == gsym->name())
1425
                {
1426
                  if (tosym == NULL)
1427
                    {
1428
                      tosym = symtab->lookup(to.c_str());
1429
                      if (tosym == NULL)
1430
                        {
1431
                          this->error(_("could not convert call "
1432
                                        "to '%s' to '%s'"),
1433
                                      from.c_str(), to.c_str());
1434
                          break;
1435
                        }
1436
                    }
1437
 
1438
                  if (*reloc_map == NULL)
1439
                    *reloc_map = new Reloc_symbol_changes(reloc_count);
1440
                  (*reloc_map)->set(i, tosym);
1441
                }
1442
            }
1443
        }
1444
    }
1445
}
1446
 
1447
// Find all the function in this object defined in section SHNDX.
1448
// Store their offsets in the section in FUNCTION_OFFSETS.
1449
 
1450
template<int size, bool big_endian>
1451
void
1452
Sized_relobj_file<size, big_endian>::find_functions(
1453
    const unsigned char* pshdrs,
1454
    unsigned int shndx,
1455
    Sized_relobj_file<size, big_endian>::Function_offsets* function_offsets)
1456
{
1457
  // We need to read the symbols to find the functions.  If we wanted
1458
  // to, we could cache reading the symbols across all sections in the
1459
  // object.
1460
  const unsigned int symtab_shndx = this->symtab_shndx_;
1461
  typename This::Shdr symtabshdr(pshdrs + symtab_shndx * This::shdr_size);
1462
  gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
1463
 
1464
  typename elfcpp::Elf_types<size>::Elf_WXword sh_size =
1465
    symtabshdr.get_sh_size();
1466
  const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
1467
                                              sh_size, true, true);
1468
 
1469
  const int sym_size = This::sym_size;
1470
  const unsigned int symcount = sh_size / sym_size;
1471
  for (unsigned int i = 0; i < symcount; ++i, psyms += sym_size)
1472
    {
1473
      typename elfcpp::Sym<size, big_endian> isym(psyms);
1474
 
1475
      // FIXME: Some targets can have functions which do not have type
1476
      // STT_FUNC, e.g., STT_ARM_TFUNC.
1477
      if (isym.get_st_type() != elfcpp::STT_FUNC
1478
          || isym.get_st_size() == 0)
1479
        continue;
1480
 
1481
      bool is_ordinary;
1482
      unsigned int sym_shndx = this->adjust_sym_shndx(i, isym.get_st_shndx(),
1483
                                                      &is_ordinary);
1484
      if (!is_ordinary || sym_shndx != shndx)
1485
        continue;
1486
 
1487
      section_offset_type value =
1488
        convert_to_section_size_type(isym.get_st_value());
1489
      section_size_type fnsize =
1490
        convert_to_section_size_type(isym.get_st_size());
1491
 
1492
      (*function_offsets)[value] = fnsize;
1493
    }
1494
}
1495
 
1496 159 khays
// Reverse the words in a section.  Used for .ctors sections mapped to
1497
// .init_array sections.  See ctors_sections_in_init_array in
1498
// layout.cc.
1499
 
1500
template<int size, bool big_endian>
1501
void
1502
Sized_relobj_file<size, big_endian>::reverse_words(unsigned char* view,
1503
                                                   section_size_type view_size)
1504
{
1505
  typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype;
1506
  Valtype* vview = reinterpret_cast<Valtype*>(view);
1507
  section_size_type vview_size = view_size / (size / 8);
1508
  for (section_size_type i = 0; i < vview_size / 2; ++i)
1509
    {
1510
      Valtype tmp = vview[i];
1511
      vview[i] = vview[vview_size - 1 - i];
1512
      vview[vview_size - 1 - i] = tmp;
1513
    }
1514
}
1515
 
1516 27 khays
// Class Merged_symbol_value.
1517
 
1518
template<int size>
1519
void
1520
Merged_symbol_value<size>::initialize_input_to_output_map(
1521
    const Relobj* object,
1522
    unsigned int input_shndx)
1523
{
1524
  Object_merge_map* map = object->merge_map();
1525
  map->initialize_input_to_output_map<size>(input_shndx,
1526
                                            this->output_start_address_,
1527
                                            &this->output_addresses_);
1528
}
1529
 
1530
// Get the output value corresponding to an input offset if we
1531
// couldn't find it in the hash table.
1532
 
1533
template<int size>
1534
typename elfcpp::Elf_types<size>::Elf_Addr
1535
Merged_symbol_value<size>::value_from_output_section(
1536
    const Relobj* object,
1537
    unsigned int input_shndx,
1538
    typename elfcpp::Elf_types<size>::Elf_Addr input_offset) const
1539
{
1540
  section_offset_type output_offset;
1541
  bool found = object->merge_map()->get_output_offset(NULL, input_shndx,
1542
                                                      input_offset,
1543
                                                      &output_offset);
1544
 
1545
  // If this assertion fails, it means that some relocation was
1546
  // against a portion of an input merge section which we didn't map
1547
  // to the output file and we didn't explicitly discard.  We should
1548
  // always map all portions of input merge sections.
1549
  gold_assert(found);
1550
 
1551
  if (output_offset == -1)
1552
    return 0;
1553
  else
1554
    return this->output_start_address_ + output_offset;
1555
}
1556
 
1557
// Track_relocs methods.
1558
 
1559
// Initialize the class to track the relocs.  This gets the object,
1560
// the reloc section index, and the type of the relocs.  This returns
1561
// false if something goes wrong.
1562
 
1563
template<int size, bool big_endian>
1564
bool
1565
Track_relocs<size, big_endian>::initialize(
1566
    Object* object,
1567
    unsigned int reloc_shndx,
1568
    unsigned int reloc_type)
1569
{
1570
  // If RELOC_SHNDX is -1U, it means there is more than one reloc
1571
  // section for the .eh_frame section.  We can't handle that case.
1572
  if (reloc_shndx == -1U)
1573
    return false;
1574
 
1575
  // If RELOC_SHNDX is 0, there is no reloc section.
1576
  if (reloc_shndx == 0)
1577
    return true;
1578
 
1579
  // Get the contents of the reloc section.
1580
  this->prelocs_ = object->section_contents(reloc_shndx, &this->len_, false);
1581
 
1582
  if (reloc_type == elfcpp::SHT_REL)
1583
    this->reloc_size_ = elfcpp::Elf_sizes<size>::rel_size;
1584
  else if (reloc_type == elfcpp::SHT_RELA)
1585
    this->reloc_size_ = elfcpp::Elf_sizes<size>::rela_size;
1586
  else
1587
    gold_unreachable();
1588
 
1589
  if (this->len_ % this->reloc_size_ != 0)
1590
    {
1591
      object->error(_("reloc section size %zu is not a multiple of "
1592
                      "reloc size %d\n"),
1593
                    static_cast<size_t>(this->len_),
1594
                    this->reloc_size_);
1595
      return false;
1596
    }
1597
 
1598
  return true;
1599
}
1600
 
1601
// Return the offset of the next reloc, or -1 if there isn't one.
1602
 
1603
template<int size, bool big_endian>
1604
off_t
1605
Track_relocs<size, big_endian>::next_offset() const
1606
{
1607
  if (this->pos_ >= this->len_)
1608
    return -1;
1609
 
1610
  // Rel and Rela start out the same, so we can always use Rel to find
1611
  // the r_offset value.
1612
  elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_);
1613
  return rel.get_r_offset();
1614
}
1615
 
1616
// Return the index of the symbol referenced by the next reloc, or -1U
1617
// if there aren't any more relocs.
1618
 
1619
template<int size, bool big_endian>
1620
unsigned int
1621
Track_relocs<size, big_endian>::next_symndx() const
1622
{
1623
  if (this->pos_ >= this->len_)
1624
    return -1U;
1625
 
1626
  // Rel and Rela start out the same, so we can use Rel to find the
1627
  // symbol index.
1628
  elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_);
1629
  return elfcpp::elf_r_sym<size>(rel.get_r_info());
1630
}
1631
 
1632
// Return the addend of the next reloc, or 0 if there isn't one.
1633
 
1634
template<int size, bool big_endian>
1635
uint64_t
1636
Track_relocs<size, big_endian>::next_addend() const
1637
{
1638
  if (this->pos_ >= this->len_)
1639
    return 0;
1640
  if (this->reloc_size_ == elfcpp::Elf_sizes<size>::rel_size)
1641
    return 0;
1642
  elfcpp::Rela<size, big_endian> rela(this->prelocs_ + this->pos_);
1643
  return rela.get_r_addend();
1644
}
1645
 
1646
// Advance to the next reloc whose r_offset is greater than or equal
1647
// to OFFSET.  Return the number of relocs we skip.
1648
 
1649
template<int size, bool big_endian>
1650
int
1651
Track_relocs<size, big_endian>::advance(off_t offset)
1652
{
1653
  int ret = 0;
1654
  while (this->pos_ < this->len_)
1655
    {
1656
      // Rel and Rela start out the same, so we can always use Rel to
1657
      // find the r_offset value.
1658
      elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_);
1659
      if (static_cast<off_t>(rel.get_r_offset()) >= offset)
1660
        break;
1661
      ++ret;
1662
      this->pos_ += this->reloc_size_;
1663
    }
1664
  return ret;
1665
}
1666
 
1667
// Instantiate the templates we need.
1668
 
1669
#ifdef HAVE_TARGET_32_LITTLE
1670
template
1671
void
1672
Sized_relobj_file<32, false>::do_read_relocs(Read_relocs_data* rd);
1673
#endif
1674
 
1675
#ifdef HAVE_TARGET_32_BIG
1676
template
1677
void
1678
Sized_relobj_file<32, true>::do_read_relocs(Read_relocs_data* rd);
1679
#endif
1680
 
1681
#ifdef HAVE_TARGET_64_LITTLE
1682
template
1683
void
1684
Sized_relobj_file<64, false>::do_read_relocs(Read_relocs_data* rd);
1685
#endif
1686
 
1687
#ifdef HAVE_TARGET_64_BIG
1688
template
1689
void
1690
Sized_relobj_file<64, true>::do_read_relocs(Read_relocs_data* rd);
1691
#endif
1692
 
1693
#ifdef HAVE_TARGET_32_LITTLE
1694
template
1695
void
1696
Sized_relobj_file<32, false>::do_gc_process_relocs(Symbol_table* symtab,
1697
                                                   Layout* layout,
1698
                                                   Read_relocs_data* rd);
1699
#endif
1700
 
1701
#ifdef HAVE_TARGET_32_BIG
1702
template
1703
void
1704
Sized_relobj_file<32, true>::do_gc_process_relocs(Symbol_table* symtab,
1705
                                                  Layout* layout,
1706
                                                  Read_relocs_data* rd);
1707
#endif
1708
 
1709
#ifdef HAVE_TARGET_64_LITTLE
1710
template
1711
void
1712
Sized_relobj_file<64, false>::do_gc_process_relocs(Symbol_table* symtab,
1713
                                                   Layout* layout,
1714
                                                   Read_relocs_data* rd);
1715
#endif
1716
 
1717
#ifdef HAVE_TARGET_64_BIG
1718
template
1719
void
1720
Sized_relobj_file<64, true>::do_gc_process_relocs(Symbol_table* symtab,
1721
                                                  Layout* layout,
1722
                                                  Read_relocs_data* rd);
1723
#endif
1724
 
1725
#ifdef HAVE_TARGET_32_LITTLE
1726
template
1727
void
1728
Sized_relobj_file<32, false>::do_scan_relocs(Symbol_table* symtab,
1729
                                             Layout* layout,
1730
                                             Read_relocs_data* rd);
1731
#endif
1732
 
1733
#ifdef HAVE_TARGET_32_BIG
1734
template
1735
void
1736
Sized_relobj_file<32, true>::do_scan_relocs(Symbol_table* symtab,
1737
                                            Layout* layout,
1738
                                            Read_relocs_data* rd);
1739
#endif
1740
 
1741
#ifdef HAVE_TARGET_64_LITTLE
1742
template
1743
void
1744
Sized_relobj_file<64, false>::do_scan_relocs(Symbol_table* symtab,
1745
                                             Layout* layout,
1746
                                             Read_relocs_data* rd);
1747
#endif
1748
 
1749
#ifdef HAVE_TARGET_64_BIG
1750
template
1751
void
1752
Sized_relobj_file<64, true>::do_scan_relocs(Symbol_table* symtab,
1753
                                            Layout* layout,
1754
                                            Read_relocs_data* rd);
1755
#endif
1756
 
1757
#ifdef HAVE_TARGET_32_LITTLE
1758
template
1759
void
1760
Sized_relobj_file<32, false>::do_relocate(const Symbol_table* symtab,
1761
                                          const Layout* layout,
1762
                                          Output_file* of);
1763
#endif
1764
 
1765
#ifdef HAVE_TARGET_32_BIG
1766
template
1767
void
1768
Sized_relobj_file<32, true>::do_relocate(const Symbol_table* symtab,
1769
                                         const Layout* layout,
1770
                                         Output_file* of);
1771
#endif
1772
 
1773
#ifdef HAVE_TARGET_64_LITTLE
1774
template
1775
void
1776
Sized_relobj_file<64, false>::do_relocate(const Symbol_table* symtab,
1777
                                          const Layout* layout,
1778
                                          Output_file* of);
1779
#endif
1780
 
1781
#ifdef HAVE_TARGET_64_BIG
1782
template
1783
void
1784
Sized_relobj_file<64, true>::do_relocate(const Symbol_table* symtab,
1785
                                         const Layout* layout,
1786
                                         Output_file* of);
1787
#endif
1788
 
1789
#ifdef HAVE_TARGET_32_LITTLE
1790
template
1791
void
1792
Sized_relobj_file<32, false>::do_relocate_sections(
1793
    const Symbol_table* symtab,
1794
    const Layout* layout,
1795
    const unsigned char* pshdrs,
1796
    Output_file* of,
1797
    Views* pviews);
1798
#endif
1799
 
1800
#ifdef HAVE_TARGET_32_BIG
1801
template
1802
void
1803
Sized_relobj_file<32, true>::do_relocate_sections(
1804
    const Symbol_table* symtab,
1805
    const Layout* layout,
1806
    const unsigned char* pshdrs,
1807
    Output_file* of,
1808
    Views* pviews);
1809
#endif
1810
 
1811
#ifdef HAVE_TARGET_64_LITTLE
1812
template
1813
void
1814
Sized_relobj_file<64, false>::do_relocate_sections(
1815
    const Symbol_table* symtab,
1816
    const Layout* layout,
1817
    const unsigned char* pshdrs,
1818
    Output_file* of,
1819
    Views* pviews);
1820
#endif
1821
 
1822
#ifdef HAVE_TARGET_64_BIG
1823
template
1824
void
1825
Sized_relobj_file<64, true>::do_relocate_sections(
1826
    const Symbol_table* symtab,
1827
    const Layout* layout,
1828
    const unsigned char* pshdrs,
1829
    Output_file* of,
1830
    Views* pviews);
1831
#endif
1832
 
1833
#ifdef HAVE_TARGET_32_LITTLE
1834
template
1835
void
1836
Sized_relobj_file<32, false>::initialize_input_to_output_maps();
1837
 
1838
template
1839
void
1840
Sized_relobj_file<32, false>::free_input_to_output_maps();
1841
#endif
1842
 
1843
#ifdef HAVE_TARGET_32_BIG
1844
template
1845
void
1846
Sized_relobj_file<32, true>::initialize_input_to_output_maps();
1847
 
1848
template
1849
void
1850
Sized_relobj_file<32, true>::free_input_to_output_maps();
1851
#endif
1852
 
1853
#ifdef HAVE_TARGET_64_LITTLE
1854
template
1855
void
1856
Sized_relobj_file<64, false>::initialize_input_to_output_maps();
1857
 
1858
template
1859
void
1860
Sized_relobj_file<64, false>::free_input_to_output_maps();
1861
#endif
1862
 
1863
#ifdef HAVE_TARGET_64_BIG
1864
template
1865
void
1866
Sized_relobj_file<64, true>::initialize_input_to_output_maps();
1867
 
1868
template
1869
void
1870
Sized_relobj_file<64, true>::free_input_to_output_maps();
1871
#endif
1872
 
1873
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1874
template
1875
class Merged_symbol_value<32>;
1876
#endif
1877
 
1878
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1879
template
1880
class Merged_symbol_value<64>;
1881
#endif
1882
 
1883
#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1884
template
1885
class Symbol_value<32>;
1886
#endif
1887
 
1888
#if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1889
template
1890
class Symbol_value<64>;
1891
#endif
1892
 
1893
#ifdef HAVE_TARGET_32_LITTLE
1894
template
1895
class Track_relocs<32, false>;
1896
#endif
1897
 
1898
#ifdef HAVE_TARGET_32_BIG
1899
template
1900
class Track_relocs<32, true>;
1901
#endif
1902
 
1903
#ifdef HAVE_TARGET_64_LITTLE
1904
template
1905
class Track_relocs<64, false>;
1906
#endif
1907
 
1908
#ifdef HAVE_TARGET_64_BIG
1909
template
1910
class Track_relocs<64, true>;
1911
#endif
1912
 
1913
} // End namespace gold.

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