1 // target-reloc.h -- target specific relocation support -*- C++ -*-
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
4 // Free Software Foundation, Inc.
5 // Written by Ian Lance Taylor <iant@google.com>.
7 // This file is part of gold.
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.
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.
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.
24 #ifndef GOLD_TARGET_RELOC_H
25 #define GOLD_TARGET_RELOC_H
31 #include "reloc-types.h"
36 // This function implements the generic part of reloc scanning. The
37 // template parameter Scan must be a class type which provides two
38 // functions: local() and global(). Those functions implement the
39 // machine specific part of scanning. We do it this way to
40 // avoid making a function call for each relocation, and to avoid
41 // repeating the generic code for each target.
43 template<int size
, bool big_endian
, typename Target_type
, int sh_type
,
50 Sized_relobj_file
<size
, big_endian
>* object
,
51 unsigned int data_shndx
,
52 const unsigned char* prelocs
,
54 Output_section
* output_section
,
55 bool needs_special_offset_handling
,
57 const unsigned char* plocal_syms
)
59 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
60 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
61 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
64 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
66 Reltype
reloc(prelocs
);
68 if (needs_special_offset_handling
69 && !output_section
->is_input_address_mapped(object
, data_shndx
,
70 reloc
.get_r_offset()))
73 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
74 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
75 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
77 if (r_sym
< local_count
)
79 gold_assert(plocal_syms
!= NULL
);
80 typename
elfcpp::Sym
<size
, big_endian
> lsym(plocal_syms
82 unsigned int shndx
= lsym
.get_st_shndx();
84 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
85 // If RELOC is a relocation against a local symbol in a
86 // section we are discarding then we can ignore it. It will
87 // eventually become a reloc against the value zero.
89 // FIXME: We should issue a warning if this is an
90 // allocated section; is this the best place to do it?
92 // FIXME: The old GNU linker would in some cases look
93 // for the linkonce section which caused this section to
94 // be discarded, and, if the other section was the same
95 // size, change the reloc to refer to the other section.
96 // That seems risky and weird to me, and I don't know of
97 // any case where it is actually required.
98 bool is_discarded
= (is_ordinary
99 && shndx
!= elfcpp::SHN_UNDEF
100 && !object
->is_section_included(shndx
)
101 && !symtab
->is_section_folded(object
, shndx
));
102 scan
.local(symtab
, layout
, target
, object
, data_shndx
,
103 output_section
, reloc
, r_type
, lsym
, is_discarded
);
107 Symbol
* gsym
= object
->global_symbol(r_sym
);
108 gold_assert(gsym
!= NULL
);
109 if (gsym
->is_forwarder())
110 gsym
= symtab
->resolve_forwards(gsym
);
112 scan
.global(symtab
, layout
, target
, object
, data_shndx
,
113 output_section
, reloc
, r_type
, gsym
);
118 // Behavior for relocations to discarded comdat sections.
122 CB_UNDETERMINED
, // Not yet determined -- need to look at section name.
123 CB_PRETEND
, // Attempt to map to the corresponding kept section.
124 CB_IGNORE
, // Ignore the relocation.
125 CB_WARNING
// Print a warning.
128 class Default_comdat_behavior
131 // Decide what the linker should do for relocations that refer to
132 // discarded comdat sections. This decision is based on the name of
133 // the section being relocated.
135 inline Comdat_behavior
136 get(const char* name
)
138 if (Layout::is_debug_info_section(name
))
140 if (strcmp(name
, ".eh_frame") == 0
141 || strcmp(name
, ".gcc_except_table") == 0)
147 // Give an error for a symbol with non-default visibility which is not
151 visibility_error(const Symbol
* sym
)
154 switch (sym
->visibility())
156 case elfcpp::STV_INTERNAL
:
159 case elfcpp::STV_HIDDEN
:
162 case elfcpp::STV_PROTECTED
:
168 gold_error(_("%s symbol '%s' is not defined locally"),
172 // Return true if we are should issue an error saying that SYM is an
173 // undefined symbol. This is called if there is a relocation against
177 issue_undefined_symbol_error(const Symbol
* sym
)
179 // We only report global symbols.
183 // We only report undefined symbols.
184 if (!sym
->is_undefined() && !sym
->is_placeholder())
187 // We don't report weak symbols.
188 if (sym
->binding() == elfcpp::STB_WEAK
)
191 // We don't report symbols defined in discarded sections.
192 if (sym
->is_defined_in_discarded_section())
195 // If the target defines this symbol, don't report it here.
196 if (parameters
->target().is_defined_by_abi(sym
))
199 // See if we've been told to ignore whether this symbol is
201 const char* const u
= parameters
->options().unresolved_symbols();
204 if (strcmp(u
, "ignore-all") == 0)
206 if (strcmp(u
, "report-all") == 0)
208 if (strcmp(u
, "ignore-in-object-files") == 0 && !sym
->in_dyn())
210 if (strcmp(u
, "ignore-in-shared-libs") == 0 && !sym
->in_reg())
214 // When creating a shared library, only report unresolved symbols if
216 if (parameters
->options().shared() && !parameters
->options().defs())
219 // Otherwise issue a warning.
223 // This function implements the generic part of relocation processing.
224 // The template parameter Relocate must be a class type which provides
225 // a single function, relocate(), which implements the machine
226 // specific part of a relocation.
228 // The template parameter Relocate_comdat_behavior is a class type
229 // which provides a single function, get(), which determines what the
230 // linker should do for relocations that refer to discarded comdat
233 // SIZE is the ELF size: 32 or 64. BIG_ENDIAN is the endianness of
234 // the data. SH_TYPE is the section type: SHT_REL or SHT_RELA.
235 // RELOCATE implements operator() to do a relocation.
237 // PRELOCS points to the relocation data. RELOC_COUNT is the number
238 // of relocs. OUTPUT_SECTION is the output section.
239 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
240 // mapped to output offsets.
242 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
243 // VIEW_SIZE is the size. These refer to the input section, unless
244 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
245 // the output section.
247 // RELOC_SYMBOL_CHANGES is used for -fsplit-stack support. If it is
248 // not NULL, it is a vector indexed by relocation index. If that
249 // entry is not NULL, it points to a global symbol which used as the
250 // symbol for the relocation, ignoring the symbol index in the
253 template<int size
, bool big_endian
, typename Target_type
, int sh_type
,
255 typename Relocate_comdat_behavior
>
258 const Relocate_info
<size
, big_endian
>* relinfo
,
260 const unsigned char* prelocs
,
262 Output_section
* output_section
,
263 bool needs_special_offset_handling
,
265 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
266 section_size_type view_size
,
267 const Reloc_symbol_changes
* reloc_symbol_changes
)
269 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
270 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
272 Relocate_comdat_behavior relocate_comdat_behavior
;
274 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
275 unsigned int local_count
= object
->local_symbol_count();
277 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
279 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
281 Reltype
reloc(prelocs
);
283 section_offset_type offset
=
284 convert_to_section_size_type(reloc
.get_r_offset());
286 if (needs_special_offset_handling
)
288 offset
= output_section
->output_offset(relinfo
->object
,
295 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
296 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
297 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
299 const Sized_symbol
<size
>* sym
;
301 Symbol_value
<size
> symval
;
302 const Symbol_value
<size
> *psymval
;
303 bool is_defined_in_discarded_section
;
305 if (r_sym
< local_count
306 && (reloc_symbol_changes
== NULL
307 || (*reloc_symbol_changes
)[i
] == NULL
))
310 psymval
= object
->local_symbol(r_sym
);
312 // If the local symbol belongs to a section we are discarding,
313 // and that section is a debug section, try to find the
314 // corresponding kept section and map this symbol to its
315 // counterpart in the kept section. The symbol must not
316 // correspond to a section we are folding.
318 shndx
= psymval
->input_shndx(&is_ordinary
);
319 is_defined_in_discarded_section
=
321 && shndx
!= elfcpp::SHN_UNDEF
322 && !object
->is_section_included(shndx
)
323 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
328 if (reloc_symbol_changes
!= NULL
329 && (*reloc_symbol_changes
)[i
] != NULL
)
330 gsym
= (*reloc_symbol_changes
)[i
];
333 gsym
= object
->global_symbol(r_sym
);
334 gold_assert(gsym
!= NULL
);
335 if (gsym
->is_forwarder())
336 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
339 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
340 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
341 symval
.set_output_symtab_index(sym
->symtab_index());
343 symval
.set_no_output_symtab_entry();
344 symval
.set_output_value(sym
->value());
345 if (gsym
->type() == elfcpp::STT_TLS
)
346 symval
.set_is_tls_symbol();
347 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
348 symval
.set_is_ifunc_symbol();
351 is_defined_in_discarded_section
=
352 (gsym
->is_defined_in_discarded_section()
353 && gsym
->is_undefined());
357 Symbol_value
<size
> symval2
;
358 if (is_defined_in_discarded_section
)
360 if (comdat_behavior
== CB_UNDETERMINED
)
362 std::string name
= object
->section_name(relinfo
->data_shndx
);
363 comdat_behavior
= relocate_comdat_behavior
.get(name
.c_str());
365 if (comdat_behavior
== CB_PRETEND
)
367 // FIXME: This case does not work for global symbols.
368 // We have no place to store the original section index.
369 // Fortunately this does not matter for comdat sections,
370 // only for sections explicitly discarded by a linker
373 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
374 object
->map_to_kept_section(shndx
, &found
);
376 symval2
.set_output_value(value
+ psymval
->input_value());
378 symval2
.set_output_value(0);
382 if (comdat_behavior
== CB_WARNING
)
383 gold_warning_at_location(relinfo
, i
, offset
,
384 _("relocation refers to discarded "
386 symval2
.set_output_value(0);
388 symval2
.set_no_output_symtab_entry();
392 // If OFFSET is out of range, still let the target decide to
393 // ignore the relocation. Pass in NULL as the VIEW argument so
394 // that it can return quickly without trashing an invalid memory
396 unsigned char *v
= view
+ offset
;
397 if (offset
< 0 || static_cast<section_size_type
>(offset
) >= view_size
)
400 if (!relocate
.relocate(relinfo
, target
, output_section
, i
, reloc
,
401 r_type
, sym
, psymval
, v
, view_address
+ offset
,
407 gold_error_at_location(relinfo
, i
, offset
,
408 _("reloc has bad offset %zu"),
409 static_cast<size_t>(offset
));
413 if (issue_undefined_symbol_error(sym
))
414 gold_undefined_symbol_at_location(sym
, relinfo
, i
, offset
);
416 && sym
->visibility() != elfcpp::STV_DEFAULT
417 && (sym
->is_undefined() || sym
->is_from_dynobj()))
418 visibility_error(sym
);
420 if (sym
!= NULL
&& sym
->has_warning())
421 relinfo
->symtab
->issue_warning(sym
, relinfo
, i
, offset
);
425 // Apply an incremental relocation.
427 template<int size
, bool big_endian
, typename Target_type
,
430 apply_relocation(const Relocate_info
<size
, big_endian
>* relinfo
,
432 typename
elfcpp::Elf_types
<size
>::Elf_Addr r_offset
,
434 typename
elfcpp::Elf_types
<size
>::Elf_Swxword r_addend
,
437 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
438 section_size_type view_size
)
440 // Construct the ELF relocation in a temporary buffer.
441 const int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
442 unsigned char relbuf
[reloc_size
];
443 elfcpp::Rela
<size
, big_endian
> rel(relbuf
);
444 elfcpp::Rela_write
<size
, big_endian
> orel(relbuf
);
445 orel
.put_r_offset(r_offset
);
446 orel
.put_r_info(elfcpp::elf_r_info
<size
>(0, r_type
));
447 orel
.put_r_addend(r_addend
);
449 // Setup a Symbol_value for the global symbol.
450 const Sized_symbol
<size
>* sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
451 Symbol_value
<size
> symval
;
452 gold_assert(sym
->has_symtab_index() && sym
->symtab_index() != -1U);
453 symval
.set_output_symtab_index(sym
->symtab_index());
454 symval
.set_output_value(sym
->value());
455 if (gsym
->type() == elfcpp::STT_TLS
)
456 symval
.set_is_tls_symbol();
457 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
458 symval
.set_is_ifunc_symbol();
461 relocate
.relocate(relinfo
, target
, NULL
, -1U, rel
, r_type
, sym
, &symval
,
462 view
+ r_offset
, address
+ r_offset
, view_size
);
465 // This class may be used as a typical class for the
466 // Scan_relocatable_reloc parameter to scan_relocatable_relocs. The
467 // template parameter Classify_reloc must be a class type which
468 // provides a function get_size_for_reloc which returns the number of
469 // bytes to which a reloc applies. This class is intended to capture
470 // the most typical target behaviour, while still permitting targets
471 // to define their own independent class for Scan_relocatable_reloc.
473 template<int sh_type
, typename Classify_reloc
>
474 class Default_scan_relocatable_relocs
477 // Return the strategy to use for a local symbol which is not a
478 // section symbol, given the relocation type.
479 inline Relocatable_relocs::Reloc_strategy
480 local_non_section_strategy(unsigned int r_type
, Relobj
*, unsigned int r_sym
)
482 // We assume that relocation type 0 is NONE. Targets which are
483 // different must override.
484 if (r_type
== 0 && r_sym
== 0)
485 return Relocatable_relocs::RELOC_DISCARD
;
486 return Relocatable_relocs::RELOC_COPY
;
489 // Return the strategy to use for a local symbol which is a section
490 // symbol, given the relocation type.
491 inline Relocatable_relocs::Reloc_strategy
492 local_section_strategy(unsigned int r_type
, Relobj
* object
)
494 if (sh_type
== elfcpp::SHT_RELA
)
495 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
;
498 Classify_reloc classify
;
499 switch (classify
.get_size_for_reloc(r_type
, object
))
502 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
;
504 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1
;
506 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2
;
508 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4
;
510 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8
;
517 // Return the strategy to use for a global symbol, given the
518 // relocation type, the object, and the symbol index.
519 inline Relocatable_relocs::Reloc_strategy
520 global_strategy(unsigned int, Relobj
*, unsigned int)
521 { return Relocatable_relocs::RELOC_COPY
; }
524 // Scan relocs during a relocatable link. This is a default
525 // definition which should work for most targets.
526 // Scan_relocatable_reloc must name a class type which provides three
527 // functions which return a Relocatable_relocs::Reloc_strategy code:
528 // global_strategy, local_non_section_strategy, and
529 // local_section_strategy. Most targets should be able to use
530 // Default_scan_relocatable_relocs as this class.
532 template<int size
, bool big_endian
, int sh_type
,
533 typename Scan_relocatable_reloc
>
535 scan_relocatable_relocs(
538 Sized_relobj_file
<size
, big_endian
>* object
,
539 unsigned int data_shndx
,
540 const unsigned char* prelocs
,
542 Output_section
* output_section
,
543 bool needs_special_offset_handling
,
544 size_t local_symbol_count
,
545 const unsigned char* plocal_syms
,
546 Relocatable_relocs
* rr
)
548 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
549 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
550 const int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
551 Scan_relocatable_reloc scan
;
553 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
555 Reltype
reloc(prelocs
);
557 Relocatable_relocs::Reloc_strategy strategy
;
559 if (needs_special_offset_handling
560 && !output_section
->is_input_address_mapped(object
, data_shndx
,
561 reloc
.get_r_offset()))
562 strategy
= Relocatable_relocs::RELOC_DISCARD
;
565 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
=
567 const unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
568 const unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
570 if (r_sym
>= local_symbol_count
)
571 strategy
= scan
.global_strategy(r_type
, object
, r_sym
);
574 gold_assert(plocal_syms
!= NULL
);
575 typename
elfcpp::Sym
<size
, big_endian
> lsym(plocal_syms
577 unsigned int shndx
= lsym
.get_st_shndx();
579 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
581 && shndx
!= elfcpp::SHN_UNDEF
582 && !object
->is_section_included(shndx
))
584 // RELOC is a relocation against a local symbol
585 // defined in a section we are discarding. Discard
586 // the reloc. FIXME: Should we issue a warning?
587 strategy
= Relocatable_relocs::RELOC_DISCARD
;
589 else if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
590 strategy
= scan
.local_non_section_strategy(r_type
, object
,
594 strategy
= scan
.local_section_strategy(r_type
, object
);
595 if (strategy
!= Relocatable_relocs::RELOC_DISCARD
)
596 object
->output_section(shndx
)->set_needs_symtab_index();
599 if (strategy
== Relocatable_relocs::RELOC_COPY
)
600 object
->set_must_have_output_symtab_entry(r_sym
);
604 rr
->set_next_reloc_strategy(strategy
);
608 // Relocate relocs. Called for a relocatable link, and for --emit-relocs.
609 // This is a default definition which should work for most targets.
611 template<int size
, bool big_endian
, int sh_type
>
614 const Relocate_info
<size
, big_endian
>* relinfo
,
615 const unsigned char* prelocs
,
617 Output_section
* output_section
,
618 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
619 const Relocatable_relocs
* rr
,
621 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
622 section_size_type view_size
,
623 unsigned char* reloc_view
,
624 section_size_type reloc_view_size
)
626 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
627 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc Reltype
;
628 typedef typename Reloc_types
<sh_type
, size
, big_endian
>::Reloc_write
630 const int reloc_size
= Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
631 const Address invalid_address
= static_cast<Address
>(0) - 1;
633 Sized_relobj_file
<size
, big_endian
>* const object
= relinfo
->object
;
634 const unsigned int local_count
= object
->local_symbol_count();
636 unsigned char* pwrite
= reloc_view
;
638 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
640 Relocatable_relocs::Reloc_strategy strategy
= rr
->strategy(i
);
641 if (strategy
== Relocatable_relocs::RELOC_DISCARD
)
644 if (strategy
== Relocatable_relocs::RELOC_SPECIAL
)
646 // Target wants to handle this relocation.
647 Sized_target
<size
, big_endian
>* target
=
648 parameters
->sized_target
<size
, big_endian
>();
649 target
->relocate_special_relocatable(relinfo
, sh_type
, prelocs
,
651 offset_in_output_section
,
654 pwrite
+= reloc_size
;
657 Reltype
reloc(prelocs
);
658 Reltype_write
reloc_write(pwrite
);
660 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
661 const unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
662 const unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
664 // Get the new symbol index.
666 unsigned int new_symndx
;
667 if (r_sym
< local_count
)
671 case Relocatable_relocs::RELOC_COPY
:
676 new_symndx
= object
->symtab_index(r_sym
);
677 gold_assert(new_symndx
!= -1U);
681 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
:
682 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
:
683 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1
:
684 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2
:
685 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4
:
686 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8
:
687 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4_UNALIGNED
:
689 // We are adjusting a section symbol. We need to find
690 // the symbol table index of the section symbol for
691 // the output section corresponding to input section
692 // in which this symbol is defined.
693 gold_assert(r_sym
< local_count
);
696 object
->local_symbol_input_shndx(r_sym
, &is_ordinary
);
697 gold_assert(is_ordinary
);
698 Output_section
* os
= object
->output_section(shndx
);
699 gold_assert(os
!= NULL
);
700 gold_assert(os
->needs_symtab_index());
701 new_symndx
= os
->symtab_index();
711 const Symbol
* gsym
= object
->global_symbol(r_sym
);
712 gold_assert(gsym
!= NULL
);
713 if (gsym
->is_forwarder())
714 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
716 gold_assert(gsym
->has_symtab_index());
717 new_symndx
= gsym
->symtab_index();
720 // Get the new offset--the location in the output section where
721 // this relocation should be applied.
723 Address offset
= reloc
.get_r_offset();
725 if (offset_in_output_section
!= invalid_address
)
726 new_offset
= offset
+ offset_in_output_section
;
729 section_offset_type sot_offset
=
730 convert_types
<section_offset_type
, Address
>(offset
);
731 section_offset_type new_sot_offset
=
732 output_section
->output_offset(object
, relinfo
->data_shndx
,
734 gold_assert(new_sot_offset
!= -1);
735 new_offset
= new_sot_offset
;
738 // In an object file, r_offset is an offset within the section.
739 // In an executable or dynamic object, generated by
740 // --emit-relocs, r_offset is an absolute address.
741 if (!parameters
->options().relocatable())
743 new_offset
+= view_address
;
744 if (offset_in_output_section
!= invalid_address
)
745 new_offset
-= offset_in_output_section
;
748 reloc_write
.put_r_offset(new_offset
);
749 reloc_write
.put_r_info(elfcpp::elf_r_info
<size
>(new_symndx
, r_type
));
751 // Handle the reloc addend based on the strategy.
753 if (strategy
== Relocatable_relocs::RELOC_COPY
)
755 if (sh_type
== elfcpp::SHT_RELA
)
756 Reloc_types
<sh_type
, size
, big_endian
>::
757 copy_reloc_addend(&reloc_write
,
762 // The relocation uses a section symbol in the input file.
763 // We are adjusting it to use a section symbol in the output
764 // file. The input section symbol refers to some address in
765 // the input section. We need the relocation in the output
766 // file to refer to that same address. This adjustment to
767 // the addend is the same calculation we use for a simple
768 // absolute relocation for the input section symbol.
770 const Symbol_value
<size
>* psymval
= object
->local_symbol(r_sym
);
772 unsigned char* padd
= view
+ offset
;
775 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA
:
777 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
;
778 addend
= Reloc_types
<sh_type
, size
, big_endian
>::
779 get_reloc_addend(&reloc
);
780 addend
= psymval
->value(object
, addend
);
781 Reloc_types
<sh_type
, size
, big_endian
>::
782 set_reloc_addend(&reloc_write
, addend
);
786 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0
:
789 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1
:
790 Relocate_functions
<size
, big_endian
>::rel8(padd
, object
,
794 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2
:
795 Relocate_functions
<size
, big_endian
>::rel16(padd
, object
,
799 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4
:
800 Relocate_functions
<size
, big_endian
>::rel32(padd
, object
,
804 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8
:
805 Relocate_functions
<size
, big_endian
>::rel64(padd
, object
,
809 case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4_UNALIGNED
:
810 Relocate_functions
<size
, big_endian
>::rel32_unaligned(padd
,
820 pwrite
+= reloc_size
;
823 gold_assert(static_cast<section_size_type
>(pwrite
- reloc_view
)
827 } // End namespace gold.
829 #endif // !defined(GOLD_TARGET_RELOC_H)