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* target.c: Include "exec.h".
[deliverable/binutils-gdb.git] / gold / arm.cc
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4a657b0d
DK		 1// arm.cc -- arm target support for gold.
2
3// Copyright 2009 Free Software Foundation, Inc.
4// Written by Doug Kwan <dougkwan@google.com> based on the i386 code
5// by Ian Lance Taylor <iant@google.com>.
6
7// This file is part of gold.
8
9// This program is free software; you can redistribute it and/or modify
10// it under the terms of the GNU General Public License as published by
11// the Free Software Foundation; either version 3 of the License, or
12// (at your option) any later version.
13
14// This program is distributed in the hope that it will be useful,
15// but WITHOUT ANY WARRANTY; without even the implied warranty of
16// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17// GNU General Public License for more details.
18
19// You should have received a copy of the GNU General Public License
20// along with this program; if not, write to the Free Software
21// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22// MA 02110-1301, USA.
23
24#include "gold.h"
25
26#include <cstring>
27#include <limits>
28#include <cstdio>
29#include <string>
30
31#include "elfcpp.h"
32#include "parameters.h"
33#include "reloc.h"
34#include "arm.h"
35#include "object.h"
36#include "symtab.h"
37#include "layout.h"
38#include "output.h"
39#include "copy-relocs.h"
40#include "target.h"
41#include "target-reloc.h"
42#include "target-select.h"
43#include "tls.h"
44#include "defstd.h"
45
46namespace
47{
48
49using namespace gold;
50
94cdfcff
DK		 51template<bool big_endian>
52class Output_data_plt_arm;
53
4a657b0d
DK		 54// The arm target class.
55//
56// This is a very simple port of gold for ARM-EABI. It is intended for
57// supporting Android only for the time being. Only these relocation types
58// are supported.
59//
60// R_ARM_NONE
61// R_ARM_ABS32
62// R_ARM_REL32
63// R_ARM_THM_CALL
64// R_ARM_COPY
65// R_ARM_GLOB_DAT
66// R_ARM_BASE_PREL
67// R_ARM_JUMP_SLOT
68// R_ARM_RELATIVE
69// R_ARM_GOTOFF32
70// R_ARM_GOT_BREL
71// R_ARM_PLT32
72// R_ARM_CALL
73// R_ARM_JUMP24
74// R_ARM_TARGET1
75// R_ARM_PREL31
76//
77// Coming soon (pending patches):
4a657b0d
DK		 78// - Relocation
79// - Defining section symbols __exidx_start and __exidx_stop.
80// - Support interworking.
81// - Mergeing all .ARM.xxx.yyy sections into .ARM.xxx. Currently, they
82// are incorrectly merged into an .ARM section.
83//
84// TODOs:
85// - Create a PT_ARM_EXIDX program header for a shared object that
86// might throw an exception.
87// - Support more relocation types as needed.
94cdfcff
DK		 88// - Make PLTs more flexible for different architecture features like
89// Thumb-2 and BE8.
4a657b0d
DK		 90
91template<bool big_endian>
92class Target_arm : public Sized_target<32, big_endian>
93{
94 public:
95 typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian>
96 Reloc_section;
97
98 Target_arm()
94cdfcff
DK		 99 : Sized_target<32, big_endian>(&arm_info),
100 got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL),
101 copy_relocs_(elfcpp::R_ARM_COPY), dynbss_(NULL)
4a657b0d
DK		 102 { }
103
104 // Process the relocations to determine unreferenced sections for
105 // garbage collection.
106 void
107 gc_process_relocs(const General_options& options,
108 Symbol_table* symtab,
109 Layout* layout,
110 Sized_relobj<32, big_endian>* object,
111 unsigned int data_shndx,
112 unsigned int sh_type,
113 const unsigned char* prelocs,
114 size_t reloc_count,
115 Output_section* output_section,
116 bool needs_special_offset_handling,
117 size_t local_symbol_count,
118 const unsigned char* plocal_symbols);
119
120 // Scan the relocations to look for symbol adjustments.
121 void
122 scan_relocs(const General_options& options,
123 Symbol_table* symtab,
124 Layout* layout,
125 Sized_relobj<32, big_endian>* object,
126 unsigned int data_shndx,
127 unsigned int sh_type,
128 const unsigned char* prelocs,
129 size_t reloc_count,
130 Output_section* output_section,
131 bool needs_special_offset_handling,
132 size_t local_symbol_count,
133 const unsigned char* plocal_symbols);
134
135 // Finalize the sections.
136 void
137 do_finalize_sections(Layout*);
138
94cdfcff 139 // Return the value to use for a dynamic symbol which requires special
4a657b0d
DK		 140 // treatment.
141 uint64_t
142 do_dynsym_value(const Symbol*) const;
143
144 // Relocate a section.
145 void
146 relocate_section(const Relocate_info<32, big_endian>*,
147 unsigned int sh_type,
148 const unsigned char* prelocs,
149 size_t reloc_count,
150 Output_section* output_section,
151 bool needs_special_offset_handling,
152 unsigned char* view,
153 elfcpp::Elf_types<32>::Elf_Addr view_address,
154 section_size_type view_size);
155
156 // Scan the relocs during a relocatable link.
157 void
158 scan_relocatable_relocs(const General_options& options,
159 Symbol_table* symtab,
160 Layout* layout,
161 Sized_relobj<32, big_endian>* object,
162 unsigned int data_shndx,
163 unsigned int sh_type,
164 const unsigned char* prelocs,
165 size_t reloc_count,
166 Output_section* output_section,
167 bool needs_special_offset_handling,
168 size_t local_symbol_count,
169 const unsigned char* plocal_symbols,
170 Relocatable_relocs*);
171
172 // Relocate a section during a relocatable link.
173 void
174 relocate_for_relocatable(const Relocate_info<32, big_endian>*,
175 unsigned int sh_type,
176 const unsigned char* prelocs,
177 size_t reloc_count,
178 Output_section* output_section,
179 off_t offset_in_output_section,
180 const Relocatable_relocs*,
181 unsigned char* view,
182 elfcpp::Elf_types<32>::Elf_Addr view_address,
183 section_size_type view_size,
184 unsigned char* reloc_view,
185 section_size_type reloc_view_size);
186
187 // Return whether SYM is defined by the ABI.
188 bool
189 do_is_defined_by_abi(Symbol* sym) const
190 { return strcmp(sym->name(), "__tls_get_addr") == 0; }
191
94cdfcff
DK		 192 // Return the size of the GOT section.
193 section_size_type
194 got_size()
195 {
196 gold_assert(this->got_ != NULL);
197 return this->got_->data_size();
198 }
199
4a657b0d
DK		 200 // Map platform-specific reloc types
201 static unsigned int
202 get_real_reloc_type (unsigned int r_type);
203
204 private:
205 // The class which scans relocations.
206 class Scan
207 {
208 public:
209 Scan()
bec53400 210 : issued_non_pic_error_(false)
4a657b0d
DK		 211 { }
212
213 inline void
214 local(const General_options& options, Symbol_table* symtab,
215 Layout* layout, Target_arm* target,
216 Sized_relobj<32, big_endian>* object,
217 unsigned int data_shndx,
218 Output_section* output_section,
219 const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type,
220 const elfcpp::Sym<32, big_endian>& lsym);
221
222 inline void
223 global(const General_options& options, Symbol_table* symtab,
224 Layout* layout, Target_arm* target,
225 Sized_relobj<32, big_endian>* object,
226 unsigned int data_shndx,
227 Output_section* output_section,
228 const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type,
229 Symbol* gsym);
230
231 private:
232 static void
233 unsupported_reloc_local(Sized_relobj<32, big_endian>*,
234 unsigned int r_type);
235
236 static void
237 unsupported_reloc_global(Sized_relobj<32, big_endian>*,
238 unsigned int r_type, Symbol*);
bec53400
DK		 239
240 void
241 check_non_pic(Relobj*, unsigned int r_type);
242
243 // Almost identical to Symbol::needs_plt_entry except that it also
244 // handles STT_ARM_TFUNC.
245 static bool
246 symbol_needs_plt_entry(const Symbol* sym)
247 {
248 // An undefined symbol from an executable does not need a PLT entry.
249 if (sym->is_undefined() && !parameters->options().shared())
250 return false;
251
252 return (!parameters->doing_static_link()
253 && (sym->type() == elfcpp::STT_FUNC
254 || sym->type() == elfcpp::STT_ARM_TFUNC)
255 && (sym->is_from_dynobj()
256 || sym->is_undefined()
257 || sym->is_preemptible()));
258 }
259
260 // Whether we have issued an error about a non-PIC compilation.
261 bool issued_non_pic_error_;
4a657b0d
DK		 262 };
263
264 // The class which implements relocation.
265 class Relocate
266 {
267 public:
268 Relocate()
269 { }
270
271 ~Relocate()
272 { }
273
bec53400
DK		 274 // Return whether the static relocation needs to be applied.
275 inline bool
276 should_apply_static_reloc(const Sized_symbol<32>* gsym,
277 int ref_flags,
278 bool is_32bit,
279 Output_section* output_section);
280
4a657b0d
DK		 281 // Do a relocation. Return false if the caller should not issue
282 // any warnings about this relocation.
283 inline bool
284 relocate(const Relocate_info<32, big_endian>*, Target_arm*,
285 Output_section*, size_t relnum,
286 const elfcpp::Rel<32, big_endian>&,
287 unsigned int r_type, const Sized_symbol<32>*,
288 const Symbol_value<32>*,
289 unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
290 section_size_type);
291 };
292
293 // A class which returns the size required for a relocation type,
294 // used while scanning relocs during a relocatable link.
295 class Relocatable_size_for_reloc
296 {
297 public:
298 unsigned int
299 get_size_for_reloc(unsigned int, Relobj*);
300 };
301
94cdfcff
DK		 302 // Get the GOT section, creating it if necessary.
303 Output_data_got<32, big_endian>*
304 got_section(Symbol_table*, Layout*);
305
306 // Get the GOT PLT section.
307 Output_data_space*
308 got_plt_section() const
309 {
310 gold_assert(this->got_plt_ != NULL);
311 return this->got_plt_;
312 }
313
314 // Create a PLT entry for a global symbol.
315 void
316 make_plt_entry(Symbol_table*, Layout*, Symbol*);
317
318 // Get the PLT section.
319 const Output_data_plt_arm<big_endian>*
320 plt_section() const
321 {
322 gold_assert(this->plt_ != NULL);
323 return this->plt_;
324 }
325
326 // Get the dynamic reloc section, creating it if necessary.
327 Reloc_section*
328 rel_dyn_section(Layout*);
329
330 // Return true if the symbol may need a COPY relocation.
331 // References from an executable object to non-function symbols
332 // defined in a dynamic object may need a COPY relocation.
333 bool
334 may_need_copy_reloc(Symbol* gsym)
335 {
336 return (!parameters->options().shared()
337 && gsym->is_from_dynobj()
bec53400
DK		 338 && gsym->type() != elfcpp::STT_FUNC
339 && gsym->type() != elfcpp::STT_ARM_TFUNC);
94cdfcff
DK		 340 }
341
342 // Add a potential copy relocation.
343 void
344 copy_reloc(Symbol_table* symtab, Layout* layout,
345 Sized_relobj<32, big_endian>* object,
346 unsigned int shndx, Output_section* output_section,
347 Symbol* sym, const elfcpp::Rel<32, big_endian>& reloc)
348 {
349 this->copy_relocs_.copy_reloc(symtab, layout,
350 symtab->get_sized_symbol<32>(sym),
351 object, shndx, output_section, reloc,
352 this->rel_dyn_section(layout));
353 }
354
4a657b0d
DK		 355 // Information about this specific target which we pass to the
356 // general Target structure.
357 static const Target::Target_info arm_info;
94cdfcff
DK		 358
359 // The types of GOT entries needed for this platform.
360 enum Got_type
361 {
362 GOT_TYPE_STANDARD = 0 // GOT entry for a regular symbol
363 };
364
365 // The GOT section.
366 Output_data_got<32, big_endian>* got_;
367 // The PLT section.
368 Output_data_plt_arm<big_endian>* plt_;
369 // The GOT PLT section.
370 Output_data_space* got_plt_;
371 // The dynamic reloc section.
372 Reloc_section* rel_dyn_;
373 // Relocs saved to avoid a COPY reloc.
374 Copy_relocs<elfcpp::SHT_REL, 32, big_endian> copy_relocs_;
375 // Space for variables copied with a COPY reloc.
376 Output_data_space* dynbss_;
4a657b0d
DK		 377};
378
379template<bool big_endian>
380const Target::Target_info Target_arm<big_endian>::arm_info =
381{
382 32, // size
383 big_endian, // is_big_endian
384 elfcpp::EM_ARM, // machine_code
385 false, // has_make_symbol
386 false, // has_resolve
387 false, // has_code_fill
388 true, // is_default_stack_executable
389 '\0', // wrap_char
390 "/usr/lib/libc.so.1", // dynamic_linker
391 0x8000, // default_text_segment_address
392 0x1000, // abi_pagesize (overridable by -z max-page-size)
393 0x1000 // common_pagesize (overridable by -z common-page-size)
394};
395
94cdfcff
DK		 396// Get the GOT section, creating it if necessary.
397
398template<bool big_endian>
399Output_data_got<32, big_endian>*
400Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout)
401{
402 if (this->got_ == NULL)
403 {
404 gold_assert(symtab != NULL && layout != NULL);
405
406 this->got_ = new Output_data_got<32, big_endian>();
407
408 Output_section* os;
409 os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
410 (elfcpp::SHF_ALLOC
411 | elfcpp::SHF_WRITE),
412 this->got_);
413 os->set_is_relro();
414
415 // The old GNU linker creates a .got.plt section. We just
416 // create another set of data in the .got section. Note that we
417 // always create a PLT if we create a GOT, although the PLT
418 // might be empty.
419 this->got_plt_ = new Output_data_space(4, "** GOT PLT");
420 os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
421 (elfcpp::SHF_ALLOC
422 | elfcpp::SHF_WRITE),
423 this->got_plt_);
424 os->set_is_relro();
425
426 // The first three entries are reserved.
427 this->got_plt_->set_current_data_size(3 * 4);
428
429 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
430 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
431 this->got_plt_,
432 0, 0, elfcpp::STT_OBJECT,
433 elfcpp::STB_LOCAL,
434 elfcpp::STV_HIDDEN, 0,
435 false, false);
436 }
437 return this->got_;
438}
439
440// Get the dynamic reloc section, creating it if necessary.
441
442template<bool big_endian>
443typename Target_arm<big_endian>::Reloc_section*
444Target_arm<big_endian>::rel_dyn_section(Layout* layout)
445{
446 if (this->rel_dyn_ == NULL)
447 {
448 gold_assert(layout != NULL);
449 this->rel_dyn_ = new Reloc_section(parameters->options().combreloc());
450 layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
451 elfcpp::SHF_ALLOC, this->rel_dyn_);
452 }
453 return this->rel_dyn_;
454}
455
456// A class to handle the PLT data.
457
458template<bool big_endian>
459class Output_data_plt_arm : public Output_section_data
460{
461 public:
462 typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian>
463 Reloc_section;
464
465 Output_data_plt_arm(Layout*, Output_data_space*);
466
467 // Add an entry to the PLT.
468 void
469 add_entry(Symbol* gsym);
470
471 // Return the .rel.plt section data.
472 const Reloc_section*
473 rel_plt() const
474 { return this->rel_; }
475
476 protected:
477 void
478 do_adjust_output_section(Output_section* os);
479
480 // Write to a map file.
481 void
482 do_print_to_mapfile(Mapfile* mapfile) const
483 { mapfile->print_output_data(this, _("** PLT")); }
484
485 private:
486 // Template for the first PLT entry.
487 static const uint32_t first_plt_entry[5];
488
489 // Template for subsequent PLT entries.
490 static const uint32_t plt_entry[3];
491
492 // Set the final size.
493 void
494 set_final_data_size()
495 {
496 this->set_data_size(sizeof(first_plt_entry)
497 + this->count_ * sizeof(plt_entry));
498 }
499
500 // Write out the PLT data.
501 void
502 do_write(Output_file*);
503
504 // The reloc section.
505 Reloc_section* rel_;
506 // The .got.plt section.
507 Output_data_space* got_plt_;
508 // The number of PLT entries.
509 unsigned int count_;
510};
511
512// Create the PLT section. The ordinary .got section is an argument,
513// since we need to refer to the start. We also create our own .got
514// section just for PLT entries.
515
516template<bool big_endian>
517Output_data_plt_arm<big_endian>::Output_data_plt_arm(Layout* layout,
518 Output_data_space* got_plt)
519 : Output_section_data(4), got_plt_(got_plt), count_(0)
520{
521 this->rel_ = new Reloc_section(false);
522 layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
523 elfcpp::SHF_ALLOC, this->rel_);
524}
525
526template<bool big_endian>
527void
528Output_data_plt_arm<big_endian>::do_adjust_output_section(Output_section* os)
529{
530 os->set_entsize(0);
531}
532
533// Add an entry to the PLT.
534
535template<bool big_endian>
536void
537Output_data_plt_arm<big_endian>::add_entry(Symbol* gsym)
538{
539 gold_assert(!gsym->has_plt_offset());
540
541 // Note that when setting the PLT offset we skip the initial
542 // reserved PLT entry.
543 gsym->set_plt_offset((this->count_) * sizeof(plt_entry)
544 + sizeof(first_plt_entry));
545
546 ++this->count_;
547
548 section_offset_type got_offset = this->got_plt_->current_data_size();
549
550 // Every PLT entry needs a GOT entry which points back to the PLT
551 // entry (this will be changed by the dynamic linker, normally
552 // lazily when the function is called).
553 this->got_plt_->set_current_data_size(got_offset + 4);
554
555 // Every PLT entry needs a reloc.
556 gsym->set_needs_dynsym_entry();
557 this->rel_->add_global(gsym, elfcpp::R_ARM_JUMP_SLOT, this->got_plt_,
558 got_offset);
559
560 // Note that we don't need to save the symbol. The contents of the
561 // PLT are independent of which symbols are used. The symbols only
562 // appear in the relocations.
563}
564
565// ARM PLTs.
566// FIXME: This is not very flexible. Right now this has only been tested
567// on armv5te. If we are to support additional architecture features like
568// Thumb-2 or BE8, we need to make this more flexible like GNU ld.
569
570// The first entry in the PLT.
571template<bool big_endian>
572const uint32_t Output_data_plt_arm<big_endian>::first_plt_entry[5] =
573{
574 0xe52de004, // str lr, [sp, #-4]!
575 0xe59fe004, // ldr lr, [pc, #4]
576 0xe08fe00e, // add lr, pc, lr
577 0xe5bef008, // ldr pc, [lr, #8]!
578 0x00000000, // &GOT[0] - .
579};
580
581// Subsequent entries in the PLT.
582
583template<bool big_endian>
584const uint32_t Output_data_plt_arm<big_endian>::plt_entry[3] =
585{
586 0xe28fc600, // add ip, pc, #0xNN00000
587 0xe28cca00, // add ip, ip, #0xNN000
588 0xe5bcf000, // ldr pc, [ip, #0xNNN]!
589};
590
591// Write out the PLT. This uses the hand-coded instructions above,
592// and adjusts them as needed. This is all specified by the arm ELF
593// Processor Supplement.
594
595template<bool big_endian>
596void
597Output_data_plt_arm<big_endian>::do_write(Output_file* of)
598{
599 const off_t offset = this->offset();
600 const section_size_type oview_size =
601 convert_to_section_size_type(this->data_size());
602 unsigned char* const oview = of->get_output_view(offset, oview_size);
603
604 const off_t got_file_offset = this->got_plt_->offset();
605 const section_size_type got_size =
606 convert_to_section_size_type(this->got_plt_->data_size());
607 unsigned char* const got_view = of->get_output_view(got_file_offset,
608 got_size);
609 unsigned char* pov = oview;
610
611 elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address();
612 elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address();
613
614 // Write first PLT entry. All but the last word are constants.
615 const size_t num_first_plt_words = (sizeof(first_plt_entry)
616 / sizeof(plt_entry[0]));
617 for (size_t i = 0; i < num_first_plt_words - 1; i++)
618 elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]);
619 // Last word in first PLT entry is &GOT[0] - .
620 elfcpp::Swap<32, big_endian>::writeval(pov + 16,
621 got_address - (plt_address + 16));
622 pov += sizeof(first_plt_entry);
623
624 unsigned char* got_pov = got_view;
625
626 memset(got_pov, 0, 12);
627 got_pov += 12;
628
629 const int rel_size = elfcpp::Elf_sizes<32>::rel_size;
630 unsigned int plt_offset = sizeof(first_plt_entry);
631 unsigned int plt_rel_offset = 0;
632 unsigned int got_offset = 12;
633 const unsigned int count = this->count_;
634 for (unsigned int i = 0;
635 i < count;
636 ++i,
637 pov += sizeof(plt_entry),
638 got_pov += 4,
639 plt_offset += sizeof(plt_entry),
640 plt_rel_offset += rel_size,
641 got_offset += 4)
642 {
643 // Set and adjust the PLT entry itself.
644 int32_t offset = ((got_address + got_offset)
645 - (plt_address + plt_offset + 8));
646
647 gold_assert(offset >= 0 && offset < 0x0fffffff);
648 uint32_t plt_insn0 = plt_entry[0] | ((offset >> 20) & 0xff);
649 elfcpp::Swap<32, big_endian>::writeval(pov, plt_insn0);
650 uint32_t plt_insn1 = plt_entry[1] | ((offset >> 12) & 0xff);
651 elfcpp::Swap<32, big_endian>::writeval(pov + 4, plt_insn1);
652 uint32_t plt_insn2 = plt_entry[2] | (offset & 0xfff);
653 elfcpp::Swap<32, big_endian>::writeval(pov + 8, plt_insn2);
654
655 // Set the entry in the GOT.
656 elfcpp::Swap<32, big_endian>::writeval(got_pov, plt_address);
657 }
658
659 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
660 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
661
662 of->write_output_view(offset, oview_size, oview);
663 of->write_output_view(got_file_offset, got_size, got_view);
664}
665
666// Create a PLT entry for a global symbol.
667
668template<bool big_endian>
669void
670Target_arm<big_endian>::make_plt_entry(Symbol_table* symtab, Layout* layout,
671 Symbol* gsym)
672{
673 if (gsym->has_plt_offset())
674 return;
675
676 if (this->plt_ == NULL)
677 {
678 // Create the GOT sections first.
679 this->got_section(symtab, layout);
680
681 this->plt_ = new Output_data_plt_arm<big_endian>(layout, this->got_plt_);
682 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
683 (elfcpp::SHF_ALLOC
684 | elfcpp::SHF_EXECINSTR),
685 this->plt_);
686 }
687 this->plt_->add_entry(gsym);
688}
689
4a657b0d
DK		 690// Report an unsupported relocation against a local symbol.
691
692template<bool big_endian>
693void
694Target_arm<big_endian>::Scan::unsupported_reloc_local(
695 Sized_relobj<32, big_endian>* object,
696 unsigned int r_type)
697{
698 gold_error(_("%s: unsupported reloc %u against local symbol"),
699 object->name().c_str(), r_type);
700}
701
bec53400
DK		 702// We are about to emit a dynamic relocation of type R_TYPE. If the
703// dynamic linker does not support it, issue an error. The GNU linker
704// only issues a non-PIC error for an allocated read-only section.
705// Here we know the section is allocated, but we don't know that it is
706// read-only. But we check for all the relocation types which the
707// glibc dynamic linker supports, so it seems appropriate to issue an
708// error even if the section is not read-only.
709
710template<bool big_endian>
711void
712Target_arm<big_endian>::Scan::check_non_pic(Relobj* object,
713 unsigned int r_type)
714{
715 switch (r_type)
716 {
717 // These are the relocation types supported by glibc for ARM.
718 case elfcpp::R_ARM_RELATIVE:
719 case elfcpp::R_ARM_COPY:
720 case elfcpp::R_ARM_GLOB_DAT:
721 case elfcpp::R_ARM_JUMP_SLOT:
722 case elfcpp::R_ARM_ABS32:
723 case elfcpp::R_ARM_PC24:
724 // FIXME: The following 3 types are not supported by Android's dynamic
725 // linker.
726 case elfcpp::R_ARM_TLS_DTPMOD32:
727 case elfcpp::R_ARM_TLS_DTPOFF32:
728 case elfcpp::R_ARM_TLS_TPOFF32:
729 return;
730
731 default:
732 // This prevents us from issuing more than one error per reloc
733 // section. But we can still wind up issuing more than one
734 // error per object file.
735 if (this->issued_non_pic_error_)
736 return;
737 object->error(_("requires unsupported dynamic reloc; "
738 "recompile with -fPIC"));
739 this->issued_non_pic_error_ = true;
740 return;
741
742 case elfcpp::R_ARM_NONE:
743 gold_unreachable();
744 }
745}
746
4a657b0d 747// Scan a relocation for a local symbol.
bec53400
DK		 748// FIXME: This only handles a subset of relocation types used by Android
749// on ARM v5te devices.
4a657b0d
DK		 750
751template<bool big_endian>
752inline void
753Target_arm<big_endian>::Scan::local(const General_options&,
bec53400
DK		 754 Symbol_table* symtab,
755 Layout* layout,
756 Target_arm* target,
4a657b0d 757 Sized_relobj<32, big_endian>* object,
bec53400
DK		 758 unsigned int data_shndx,
759 Output_section* output_section,
760 const elfcpp::Rel<32, big_endian>& reloc,
4a657b0d
DK		 761 unsigned int r_type,
762 const elfcpp::Sym<32, big_endian>&)
763{
764 r_type = get_real_reloc_type(r_type);
765 switch (r_type)
766 {
767 case elfcpp::R_ARM_NONE:
768 break;
769
bec53400
DK		 770 case elfcpp::R_ARM_ABS32:
771 // If building a shared library (or a position-independent
772 // executable), we need to create a dynamic relocation for
773 // this location. The relocation applied at link time will
774 // apply the link-time value, so we flag the location with
775 // an R_ARM_RELATIVE relocation so the dynamic loader can
776 // relocate it easily.
777 if (parameters->options().output_is_position_independent())
778 {
779 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
780 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
781 // If we are to add more other reloc types than R_ARM_ABS32,
782 // we need to add check_non_pic(object, r_type) here.
783 rel_dyn->add_local_relative(object, r_sym, elfcpp::R_ARM_RELATIVE,
784 output_section, data_shndx,
785 reloc.get_r_offset());
786 }
787 break;
788
789 case elfcpp::R_ARM_REL32:
790 case elfcpp::R_ARM_THM_CALL:
791 case elfcpp::R_ARM_CALL:
792 case elfcpp::R_ARM_PREL31:
793 case elfcpp::R_ARM_JUMP24:
794 case elfcpp::R_ARM_PLT32:
795 break;
796
797 case elfcpp::R_ARM_GOTOFF32:
798 // We need a GOT section:
799 target->got_section(symtab, layout);
800 break;
801
802 case elfcpp::R_ARM_BASE_PREL:
803 // FIXME: What about this?
804 break;
805
806 case elfcpp::R_ARM_GOT_BREL:
807 {
808 // The symbol requires a GOT entry.
809 Output_data_got<32, big_endian>* got =
810 target->got_section(symtab, layout);
811 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
812 if (got->add_local(object, r_sym, GOT_TYPE_STANDARD))
813 {
814 // If we are generating a shared object, we need to add a
815 // dynamic RELATIVE relocation for this symbol's GOT entry.
816 if (parameters->options().output_is_position_independent())
817 {
818 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
819 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
820 rel_dyn->add_local_relative(
821 object, r_sym, elfcpp::R_ARM_RELATIVE, got,
822 object->local_got_offset(r_sym, GOT_TYPE_STANDARD));
823 }
824 }
825 }
826 break;
827
828 case elfcpp::R_ARM_TARGET1:
829 // This should have been mapped to another type already.
830 // Fall through.
831 case elfcpp::R_ARM_COPY:
832 case elfcpp::R_ARM_GLOB_DAT:
833 case elfcpp::R_ARM_JUMP_SLOT:
834 case elfcpp::R_ARM_RELATIVE:
835 // These are relocations which should only be seen by the
836 // dynamic linker, and should never be seen here.
837 gold_error(_("%s: unexpected reloc %u in object file"),
838 object->name().c_str(), r_type);
839 break;
840
4a657b0d
DK		 841 default:
842 unsupported_reloc_local(object, r_type);
843 break;
844 }
845}
846
847// Report an unsupported relocation against a global symbol.
848
849template<bool big_endian>
850void
851Target_arm<big_endian>::Scan::unsupported_reloc_global(
852 Sized_relobj<32, big_endian>* object,
853 unsigned int r_type,
854 Symbol* gsym)
855{
856 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
857 object->name().c_str(), r_type, gsym->demangled_name().c_str());
858}
859
860// Scan a relocation for a global symbol.
bec53400
DK		 861// FIXME: This only handles a subset of relocation types used by Android
862// on ARM v5te devices.
4a657b0d
DK		 863
864template<bool big_endian>
865inline void
866Target_arm<big_endian>::Scan::global(const General_options&,
bec53400
DK		 867 Symbol_table* symtab,
868 Layout* layout,
869 Target_arm* target,
4a657b0d 870 Sized_relobj<32, big_endian>* object,
bec53400
DK		 871 unsigned int data_shndx,
872 Output_section* output_section,
873 const elfcpp::Rel<32, big_endian>& reloc,
4a657b0d
DK		 874 unsigned int r_type,
875 Symbol* gsym)
876{
877 r_type = get_real_reloc_type(r_type);
878 switch (r_type)
879 {
880 case elfcpp::R_ARM_NONE:
881 break;
882
bec53400
DK		 883 case elfcpp::R_ARM_ABS32:
884 {
885 // Make a dynamic relocation if necessary.
886 if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF))
887 {
888 if (target->may_need_copy_reloc(gsym))
889 {
890 target->copy_reloc(symtab, layout, object,
891 data_shndx, output_section, gsym, reloc);
892 }
893 else if (gsym->can_use_relative_reloc(false))
894 {
895 // If we are to add more other reloc types than R_ARM_ABS32,
896 // we need to add check_non_pic(object, r_type) here.
897 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
898 rel_dyn->add_global_relative(gsym, elfcpp::R_ARM_RELATIVE,
899 output_section, object,
900 data_shndx, reloc.get_r_offset());
901 }
902 else
903 {
904 // If we are to add more other reloc types than R_ARM_ABS32,
905 // we need to add check_non_pic(object, r_type) here.
906 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
907 rel_dyn->add_global(gsym, r_type, output_section, object,
908 data_shndx, reloc.get_r_offset());
909 }
910 }
911 }
912 break;
913
914 case elfcpp::R_ARM_REL32:
915 case elfcpp::R_ARM_PREL31:
916 {
917 // Make a dynamic relocation if necessary.
918 int flags = Symbol::NON_PIC_REF;
919 if (gsym->needs_dynamic_reloc(flags))
920 {
921 if (target->may_need_copy_reloc(gsym))
922 {
923 target->copy_reloc(symtab, layout, object,
924 data_shndx, output_section, gsym, reloc);
925 }
926 else
927 {
928 check_non_pic(object, r_type);
929 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
930 rel_dyn->add_global(gsym, r_type, output_section, object,
931 data_shndx, reloc.get_r_offset());
932 }
933 }
934 }
935 break;
936
937 case elfcpp::R_ARM_JUMP24:
938 case elfcpp::R_ARM_THM_CALL:
939 case elfcpp::R_ARM_CALL:
940 {
941 if (Target_arm<big_endian>::Scan::symbol_needs_plt_entry(gsym))
942 target->make_plt_entry(symtab, layout, gsym);
943 // Make a dynamic relocation if necessary.
944 int flags = Symbol::NON_PIC_REF;
945 if (gsym->type() == elfcpp::STT_FUNC
07800fab 946 || gsym->type() == elfcpp::STT_ARM_TFUNC)
bec53400
DK		 947 flags |= Symbol::FUNCTION_CALL;
948 if (gsym->needs_dynamic_reloc(flags))
949 {
950 if (target->may_need_copy_reloc(gsym))
951 {
952 target->copy_reloc(symtab, layout, object,
953 data_shndx, output_section, gsym,
954 reloc);
955 }
956 else
957 {
958 check_non_pic(object, r_type);
959 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
960 rel_dyn->add_global(gsym, r_type, output_section, object,
961 data_shndx, reloc.get_r_offset());
962 }
963 }
964 }
965 break;
966
967 case elfcpp::R_ARM_PLT32:
968 // If the symbol is fully resolved, this is just a relative
969 // local reloc. Otherwise we need a PLT entry.
970 if (gsym->final_value_is_known())
971 break;
972 // If building a shared library, we can also skip the PLT entry
973 // if the symbol is defined in the output file and is protected
974 // or hidden.
975 if (gsym->is_defined()
976 && !gsym->is_from_dynobj()
977 && !gsym->is_preemptible())
978 break;
979 target->make_plt_entry(symtab, layout, gsym);
980 break;
981
982 case elfcpp::R_ARM_GOTOFF32:
983 // We need a GOT section.
984 target->got_section(symtab, layout);
985 break;
986
987 case elfcpp::R_ARM_BASE_PREL:
988 // FIXME: What about this?
989 break;
990
991 case elfcpp::R_ARM_GOT_BREL:
992 {
993 // The symbol requires a GOT entry.
994 Output_data_got<32, big_endian>* got =
995 target->got_section(symtab, layout);
996 if (gsym->final_value_is_known())
997 got->add_global(gsym, GOT_TYPE_STANDARD);
998 else
999 {
1000 // If this symbol is not fully resolved, we need to add a
1001 // GOT entry with a dynamic relocation.
1002 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1003 if (gsym->is_from_dynobj()
1004 || gsym->is_undefined()
1005 || gsym->is_preemptible())
1006 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
1007 rel_dyn, elfcpp::R_ARM_GLOB_DAT);
1008 else
1009 {
1010 if (got->add_global(gsym, GOT_TYPE_STANDARD))
1011 rel_dyn->add_global_relative(
1012 gsym, elfcpp::R_ARM_RELATIVE, got,
1013 gsym->got_offset(GOT_TYPE_STANDARD));
1014 }
1015 }
1016 }
1017 break;
1018
1019 case elfcpp::R_ARM_TARGET1:
1020 // This should have been mapped to another type already.
1021 // Fall through.
1022 case elfcpp::R_ARM_COPY:
1023 case elfcpp::R_ARM_GLOB_DAT:
1024 case elfcpp::R_ARM_JUMP_SLOT:
1025 case elfcpp::R_ARM_RELATIVE:
1026 // These are relocations which should only be seen by the
1027 // dynamic linker, and should never be seen here.
1028 gold_error(_("%s: unexpected reloc %u in object file"),
1029 object->name().c_str(), r_type);
1030 break;
1031
4a657b0d
DK		 1032 default:
1033 unsupported_reloc_global(object, r_type, gsym);
1034 break;
1035 }
1036}
1037
1038// Process relocations for gc.
1039
1040template<bool big_endian>
1041void
1042Target_arm<big_endian>::gc_process_relocs(const General_options& options,
1043 Symbol_table* symtab,
1044 Layout* layout,
1045 Sized_relobj<32, big_endian>* object,
1046 unsigned int data_shndx,
1047 unsigned int,
1048 const unsigned char* prelocs,
1049 size_t reloc_count,
1050 Output_section* output_section,
1051 bool needs_special_offset_handling,
1052 size_t local_symbol_count,
1053 const unsigned char* plocal_symbols)
1054{
1055 typedef Target_arm<big_endian> Arm;
1056 typedef typename Target_arm<big_endian>::Scan Scan;
1057
1058 gold::gc_process_relocs<32, big_endian, Arm, elfcpp::SHT_REL, Scan>(
1059 options,
1060 symtab,
1061 layout,
1062 this,
1063 object,
1064 data_shndx,
1065 prelocs,
1066 reloc_count,
1067 output_section,
1068 needs_special_offset_handling,
1069 local_symbol_count,
1070 plocal_symbols);
1071}
1072
1073// Scan relocations for a section.
1074
1075template<bool big_endian>
1076void
1077Target_arm<big_endian>::scan_relocs(const General_options& options,
1078 Symbol_table* symtab,
1079 Layout* layout,
1080 Sized_relobj<32, big_endian>* object,
1081 unsigned int data_shndx,
1082 unsigned int sh_type,
1083 const unsigned char* prelocs,
1084 size_t reloc_count,
1085 Output_section* output_section,
1086 bool needs_special_offset_handling,
1087 size_t local_symbol_count,
1088 const unsigned char* plocal_symbols)
1089{
1090 typedef typename Target_arm<big_endian>::Scan Scan;
1091 if (sh_type == elfcpp::SHT_RELA)
1092 {
1093 gold_error(_("%s: unsupported RELA reloc section"),
1094 object->name().c_str());
1095 return;
1096 }
1097
1098 gold::scan_relocs<32, big_endian, Target_arm, elfcpp::SHT_REL, Scan>(
1099 options,
1100 symtab,
1101 layout,
1102 this,
1103 object,
1104 data_shndx,
1105 prelocs,
1106 reloc_count,
1107 output_section,
1108 needs_special_offset_handling,
1109 local_symbol_count,
1110 plocal_symbols);
1111}
1112
1113// Finalize the sections.
1114
1115template<bool big_endian>
1116void
94cdfcff 1117Target_arm<big_endian>::do_finalize_sections(Layout* layout)
4a657b0d 1118{
94cdfcff
DK		 1119 // Fill in some more dynamic tags.
1120 Output_data_dynamic* const odyn = layout->dynamic_data();
1121 if (odyn != NULL)
1122 {
1123 if (this->got_plt_ != NULL)
1124 odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_);
1125
1126 if (this->plt_ != NULL)
1127 {
1128 const Output_data* od = this->plt_->rel_plt();
1129 odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
1130 odyn->add_section_address(elfcpp::DT_JMPREL, od);
1131 odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL);
1132 }
1133
1134 if (this->rel_dyn_ != NULL)
1135 {
1136 const Output_data* od = this->rel_dyn_;
1137 odyn->add_section_address(elfcpp::DT_REL, od);
1138 odyn->add_section_size(elfcpp::DT_RELSZ, od);
1139 odyn->add_constant(elfcpp::DT_RELENT,
1140 elfcpp::Elf_sizes<32>::rel_size);
1141 }
1142
1143 if (!parameters->options().shared())
1144 {
1145 // The value of the DT_DEBUG tag is filled in by the dynamic
1146 // linker at run time, and used by the debugger.
1147 odyn->add_constant(elfcpp::DT_DEBUG, 0);
1148 }
1149 }
1150
1151 // Emit any relocs we saved in an attempt to avoid generating COPY
1152 // relocs.
1153 if (this->copy_relocs_.any_saved_relocs())
1154 this->copy_relocs_.emit(this->rel_dyn_section(layout));
4a657b0d
DK		 1155}
1156
bec53400
DK		 1157// Return whether a direct absolute static relocation needs to be applied.
1158// In cases where Scan::local() or Scan::global() has created
1159// a dynamic relocation other than R_ARM_RELATIVE, the addend
1160// of the relocation is carried in the data, and we must not
1161// apply the static relocation.
1162
1163template<bool big_endian>
1164inline bool
1165Target_arm<big_endian>::Relocate::should_apply_static_reloc(
1166 const Sized_symbol<32>* gsym,
1167 int ref_flags,
1168 bool is_32bit,
1169 Output_section* output_section)
1170{
1171 // If the output section is not allocated, then we didn't call
1172 // scan_relocs, we didn't create a dynamic reloc, and we must apply
1173 // the reloc here.
1174 if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0)
1175 return true;
1176
1177 // For local symbols, we will have created a non-RELATIVE dynamic
1178 // relocation only if (a) the output is position independent,
1179 // (b) the relocation is absolute (not pc- or segment-relative), and
1180 // (c) the relocation is not 32 bits wide.
1181 if (gsym == NULL)
1182 return !(parameters->options().output_is_position_independent()
1183 && (ref_flags & Symbol::ABSOLUTE_REF)
1184 && !is_32bit);
1185
1186 // For global symbols, we use the same helper routines used in the
1187 // scan pass. If we did not create a dynamic relocation, or if we
1188 // created a RELATIVE dynamic relocation, we should apply the static
1189 // relocation.
1190 bool has_dyn = gsym->needs_dynamic_reloc(ref_flags);
1191 bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF)
1192 && gsym->can_use_relative_reloc(ref_flags
1193 & Symbol::FUNCTION_CALL);
1194 return !has_dyn || is_rel;
1195}
1196
4a657b0d
DK		 1197// Perform a relocation.
1198
1199template<bool big_endian>
1200inline bool
1201Target_arm<big_endian>::Relocate::relocate(
1202 const Relocate_info<32, big_endian>* /* relinfo */,
1203 Target_arm* /* target */,
1204 Output_section* /* output_section */,
1205 size_t /* relnum */,
1206 const elfcpp::Rel<32, big_endian>& /* rel */,
1207 unsigned int r_type,
1208 const Sized_symbol<32>* /* gsym */,
1209 const Symbol_value<32>* /* psymval */,
1210 unsigned char* /* view */,
1211 elfcpp::Elf_types<32>::Elf_Addr /* address */,
1212 section_size_type /* view_size */ )
1213{
1214 switch (r_type)
1215 {
1216 case elfcpp::R_ARM_NONE:
1217 break;
1218
1219 default:
1220 gold_unreachable();
1221 }
1222
1223 return true;
1224}
1225
1226// Relocate section data.
1227
1228template<bool big_endian>
1229void
1230Target_arm<big_endian>::relocate_section(
1231 const Relocate_info<32, big_endian>* relinfo,
1232 unsigned int sh_type,
1233 const unsigned char* prelocs,
1234 size_t reloc_count,
1235 Output_section* output_section,
1236 bool needs_special_offset_handling,
1237 unsigned char* view,
1238 elfcpp::Elf_types<32>::Elf_Addr address,
1239 section_size_type view_size)
1240{
1241 typedef typename Target_arm<big_endian>::Relocate Arm_relocate;
1242 gold_assert(sh_type == elfcpp::SHT_REL);
1243
1244 gold::relocate_section<32, big_endian, Target_arm, elfcpp::SHT_REL,
1245 Arm_relocate>(
1246 relinfo,
1247 this,
1248 prelocs,
1249 reloc_count,
1250 output_section,
1251 needs_special_offset_handling,
1252 view,
1253 address,
1254 view_size);
1255}
1256
1257// Return the size of a relocation while scanning during a relocatable
1258// link.
1259
1260template<bool big_endian>
1261unsigned int
1262Target_arm<big_endian>::Relocatable_size_for_reloc::get_size_for_reloc(
1263 unsigned int r_type,
1264 Relobj* object)
1265{
1266 r_type = get_real_reloc_type(r_type);
1267 switch (r_type)
1268 {
1269 case elfcpp::R_ARM_NONE:
1270 return 0;
1271
1272 case elfcpp::R_ARM_ABS32:
1273 case elfcpp::R_ARM_REL32:
1274 case elfcpp::R_ARM_THM_CALL:
1275 case elfcpp::R_ARM_GOTOFF32:
1276 case elfcpp::R_ARM_BASE_PREL:
1277 case elfcpp::R_ARM_GOT_BREL:
1278 case elfcpp::R_ARM_PLT32:
1279 case elfcpp::R_ARM_CALL:
1280 case elfcpp::R_ARM_JUMP24:
1281 case elfcpp::R_ARM_PREL31:
1282 return 4;
1283
1284 case elfcpp::R_ARM_TARGET1:
1285 // This should have been mapped to another type already.
1286 // Fall through.
1287 case elfcpp::R_ARM_COPY:
1288 case elfcpp::R_ARM_GLOB_DAT:
1289 case elfcpp::R_ARM_JUMP_SLOT:
1290 case elfcpp::R_ARM_RELATIVE:
1291 // These are relocations which should only be seen by the
1292 // dynamic linker, and should never be seen here.
1293 gold_error(_("%s: unexpected reloc %u in object file"),
1294 object->name().c_str(), r_type);
1295 return 0;
1296
1297 default:
1298 object->error(_("unsupported reloc %u in object file"), r_type);
1299 return 0;
1300 }
1301}
1302
1303// Scan the relocs during a relocatable link.
1304
1305template<bool big_endian>
1306void
1307Target_arm<big_endian>::scan_relocatable_relocs(
1308 const General_options& options,
1309 Symbol_table* symtab,
1310 Layout* layout,
1311 Sized_relobj<32, big_endian>* object,
1312 unsigned int data_shndx,
1313 unsigned int sh_type,
1314 const unsigned char* prelocs,
1315 size_t reloc_count,
1316 Output_section* output_section,
1317 bool needs_special_offset_handling,
1318 size_t local_symbol_count,
1319 const unsigned char* plocal_symbols,
1320 Relocatable_relocs* rr)
1321{
1322 gold_assert(sh_type == elfcpp::SHT_REL);
1323
1324 typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL,
1325 Relocatable_size_for_reloc> Scan_relocatable_relocs;
1326
1327 gold::scan_relocatable_relocs<32, big_endian, elfcpp::SHT_REL,
1328 Scan_relocatable_relocs>(
1329 options,
1330 symtab,
1331 layout,
1332 object,
1333 data_shndx,
1334 prelocs,
1335 reloc_count,
1336 output_section,
1337 needs_special_offset_handling,
1338 local_symbol_count,
1339 plocal_symbols,
1340 rr);
1341}
1342
1343// Relocate a section during a relocatable link.
1344
1345template<bool big_endian>
1346void
1347Target_arm<big_endian>::relocate_for_relocatable(
1348 const Relocate_info<32, big_endian>* relinfo,
1349 unsigned int sh_type,
1350 const unsigned char* prelocs,
1351 size_t reloc_count,
1352 Output_section* output_section,
1353 off_t offset_in_output_section,
1354 const Relocatable_relocs* rr,
1355 unsigned char* view,
1356 elfcpp::Elf_types<32>::Elf_Addr view_address,
1357 section_size_type view_size,
1358 unsigned char* reloc_view,
1359 section_size_type reloc_view_size)
1360{
1361 gold_assert(sh_type == elfcpp::SHT_REL);
1362
1363 gold::relocate_for_relocatable<32, big_endian, elfcpp::SHT_REL>(
1364 relinfo,
1365 prelocs,
1366 reloc_count,
1367 output_section,
1368 offset_in_output_section,
1369 rr,
1370 view,
1371 view_address,
1372 view_size,
1373 reloc_view,
1374 reloc_view_size);
1375}
1376
94cdfcff
DK		 1377// Return the value to use for a dynamic symbol which requires special
1378// treatment. This is how we support equality comparisons of function
1379// pointers across shared library boundaries, as described in the
1380// processor specific ABI supplement.
1381
4a657b0d
DK		 1382template<bool big_endian>
1383uint64_t
94cdfcff 1384Target_arm<big_endian>::do_dynsym_value(const Symbol* gsym) const
4a657b0d 1385{
94cdfcff
DK		 1386 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
1387 return this->plt_section()->address() + gsym->plt_offset();
4a657b0d
DK		 1388}
1389
1390// Map platform-specific relocs to real relocs
1391//
1392template<bool big_endian>
1393unsigned int
1394Target_arm<big_endian>::get_real_reloc_type (unsigned int r_type)
1395{
1396 switch (r_type)
1397 {
1398 case elfcpp::R_ARM_TARGET1:
1399 // This is either R_ARM_ABS32 or R_ARM_REL32;
1400 return elfcpp::R_ARM_ABS32;
1401
1402 case elfcpp::R_ARM_TARGET2:
1403 // This can be any reloc type but ususally is R_ARM_GOT_PREL
1404 return elfcpp::R_ARM_GOT_PREL;
1405
1406 default:
1407 return r_type;
1408 }
1409}
1410
1411// The selector for arm object files.
1412
1413template<bool big_endian>
1414class Target_selector_arm : public Target_selector
1415{
1416 public:
1417 Target_selector_arm()
1418 : Target_selector(elfcpp::EM_ARM, 32, big_endian,
1419 (big_endian ? "elf32-bigarm" : "elf32-littlearm"))
1420 { }
1421
1422 Target*
1423 do_instantiate_target()
1424 { return new Target_arm<big_endian>(); }
1425};
1426
1427Target_selector_arm<false> target_selector_arm;
1428Target_selector_arm<true> target_selector_armbe;
1429
1430} // End anonymous namespace.
GDB Binutils - Deliverables
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