1 // target.h -- target support for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
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.
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.
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.
23 // The abstract class Target is the interface for target specific
24 // support. It defines abstract methods which each target must
25 // implement. Typically there will be one target per processor, but
26 // in some cases it may be necessary to have subclasses.
28 // For speed and consistency we want to use inline functions to handle
29 // relocation processing. So besides implementations of the abstract
30 // methods, each target is expected to define a template
31 // specialization of the relocation functions.
38 #include "parameters.h"
46 template<int size
, bool big_endian
>
48 template<int size
, bool big_endian
>
49 class Sized_relobj_file
;
50 class Relocatable_relocs
;
51 template<int size
, bool big_endian
>
53 class Reloc_symbol_changes
;
59 template<int size
, bool big_endian
>
60 class Output_data_got
;
65 // The abstract class for target specific handling.
73 // Return the bit size that this target implements. This should
77 { return this->pti_
->size
; }
79 // Return whether this target is big-endian.
82 { return this->pti_
->is_big_endian
; }
84 // Machine code to store in e_machine field of ELF header.
87 { return this->pti_
->machine_code
; }
89 // Processor specific flags to store in e_flags field of ELF header.
91 processor_specific_flags() const
92 { return this->processor_specific_flags_
; }
94 // Whether processor specific flags are set at least once.
96 are_processor_specific_flags_set() const
97 { return this->are_processor_specific_flags_set_
; }
99 // Whether this target has a specific make_symbol function.
101 has_make_symbol() const
102 { return this->pti_
->has_make_symbol
; }
104 // Whether this target has a specific resolve function.
107 { return this->pti_
->has_resolve
; }
109 // Whether this target has a specific code fill function.
111 has_code_fill() const
112 { return this->pti_
->has_code_fill
; }
114 // Return the default name of the dynamic linker.
116 dynamic_linker() const
117 { return this->pti_
->dynamic_linker
; }
119 // Return the default address to use for the text segment.
121 default_text_segment_address() const
122 { return this->pti_
->default_text_segment_address
; }
124 // Return the ABI specified page size.
128 if (parameters
->options().max_page_size() > 0)
129 return parameters
->options().max_page_size();
131 return this->pti_
->abi_pagesize
;
134 // Return the common page size used on actual systems.
136 common_pagesize() const
138 if (parameters
->options().common_page_size() > 0)
139 return std::min(parameters
->options().common_page_size(),
140 this->abi_pagesize());
142 return std::min(this->pti_
->common_pagesize
,
143 this->abi_pagesize());
146 // If we see some object files with .note.GNU-stack sections, and
147 // some objects files without them, this returns whether we should
148 // consider the object files without them to imply that the stack
149 // should be executable.
151 is_default_stack_executable() const
152 { return this->pti_
->is_default_stack_executable
; }
154 // Return a character which may appear as a prefix for a wrap
155 // symbol. If this character appears, we strip it when checking for
156 // wrapping and add it back when forming the final symbol name.
157 // This should be '\0' if not special prefix is required, which is
161 { return this->pti_
->wrap_char
; }
163 // Return the special section index which indicates a small common
164 // symbol. This will return SHN_UNDEF if there are no small common
167 small_common_shndx() const
168 { return this->pti_
->small_common_shndx
; }
170 // Return values to add to the section flags for the section holding
171 // small common symbols.
173 small_common_section_flags() const
175 gold_assert(this->pti_
->small_common_shndx
!= elfcpp::SHN_UNDEF
);
176 return this->pti_
->small_common_section_flags
;
179 // Return the special section index which indicates a large common
180 // symbol. This will return SHN_UNDEF if there are no large common
183 large_common_shndx() const
184 { return this->pti_
->large_common_shndx
; }
186 // Return values to add to the section flags for the section holding
187 // large common symbols.
189 large_common_section_flags() const
191 gold_assert(this->pti_
->large_common_shndx
!= elfcpp::SHN_UNDEF
);
192 return this->pti_
->large_common_section_flags
;
195 // This hook is called when an output section is created.
197 new_output_section(Output_section
* os
) const
198 { this->do_new_output_section(os
); }
200 // This is called to tell the target to complete any sections it is
201 // handling. After this all sections must have their final size.
203 finalize_sections(Layout
* layout
, const Input_objects
* input_objects
,
204 Symbol_table
* symtab
)
205 { return this->do_finalize_sections(layout
, input_objects
, symtab
); }
207 // Return the value to use for a global symbol which needs a special
208 // value in the dynamic symbol table. This will only be called if
209 // the backend first calls symbol->set_needs_dynsym_value().
211 dynsym_value(const Symbol
* sym
) const
212 { return this->do_dynsym_value(sym
); }
214 // Return a string to use to fill out a code section. This is
215 // basically one or more NOPS which must fill out the specified
218 code_fill(section_size_type length
) const
219 { return this->do_code_fill(length
); }
221 // Return whether SYM is known to be defined by the ABI. This is
222 // used to avoid inappropriate warnings about undefined symbols.
224 is_defined_by_abi(const Symbol
* sym
) const
225 { return this->do_is_defined_by_abi(sym
); }
227 // Adjust the output file header before it is written out. VIEW
228 // points to the header in external form. LEN is the length.
230 adjust_elf_header(unsigned char* view
, int len
) const
231 { return this->do_adjust_elf_header(view
, len
); }
233 // Return whether NAME is a local label name. This is used to implement the
234 // --discard-locals options.
236 is_local_label_name(const char* name
) const
237 { return this->do_is_local_label_name(name
); }
239 // Get the symbol index to use for a target specific reloc.
241 reloc_symbol_index(void* arg
, unsigned int type
) const
242 { return this->do_reloc_symbol_index(arg
, type
); }
244 // Get the addend to use for a target specific reloc.
246 reloc_addend(void* arg
, unsigned int type
, uint64_t addend
) const
247 { return this->do_reloc_addend(arg
, type
, addend
); }
249 // Return the PLT section to use for a global symbol. This is used
250 // for STT_GNU_IFUNC symbols.
252 plt_section_for_global(const Symbol
* sym
) const
253 { return this->do_plt_section_for_global(sym
); }
255 // Return the PLT section to use for a local symbol. This is used
256 // for STT_GNU_IFUNC symbols.
258 plt_section_for_local(const Relobj
* object
, unsigned int symndx
) const
259 { return this->do_plt_section_for_local(object
, symndx
); }
261 // Return whether this target can use relocation types to determine
262 // if a function's address is taken.
264 can_check_for_function_pointers() const
265 { return this->do_can_check_for_function_pointers(); }
267 // Return whether a relocation to a merged section can be processed
268 // to retrieve the contents.
270 can_icf_inline_merge_sections () const
271 { return this->pti_
->can_icf_inline_merge_sections
; }
273 // Whether a section called SECTION_NAME may have function pointers to
274 // sections not eligible for safe ICF folding.
276 section_may_have_icf_unsafe_pointers(const char* section_name
) const
277 { return this->do_section_may_have_icf_unsafe_pointers(section_name
); }
279 // Return true if a reference to SYM from a reloc of type R_TYPE
280 // means that the current function may call an object compiled
281 // without -fsplit-stack. SYM is known to be defined in an object
282 // compiled without -fsplit-stack.
284 is_call_to_non_split(const Symbol
* sym
, unsigned int r_type
) const
285 { return this->do_is_call_to_non_split(sym
, r_type
); }
287 // A function starts at OFFSET in section SHNDX in OBJECT. That
288 // function was compiled with -fsplit-stack, but it refers to a
289 // function which was compiled without -fsplit-stack. VIEW is a
290 // modifiable view of the section; VIEW_SIZE is the size of the
291 // view. The target has to adjust the function so that it allocates
294 calls_non_split(Relobj
* object
, unsigned int shndx
,
295 section_offset_type fnoffset
, section_size_type fnsize
,
296 unsigned char* view
, section_size_type view_size
,
297 std::string
* from
, std::string
* to
) const
299 this->do_calls_non_split(object
, shndx
, fnoffset
, fnsize
, view
, view_size
,
303 // Make an ELF object.
304 template<int size
, bool big_endian
>
306 make_elf_object(const std::string
& name
, Input_file
* input_file
,
307 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
308 { return this->do_make_elf_object(name
, input_file
, offset
, ehdr
); }
310 // Make an output section.
312 make_output_section(const char* name
, elfcpp::Elf_Word type
,
313 elfcpp::Elf_Xword flags
)
314 { return this->do_make_output_section(name
, type
, flags
); }
316 // Return true if target wants to perform relaxation.
320 // Run the dummy relaxation pass twice if relaxation debugging is enabled.
321 if (is_debugging_enabled(DEBUG_RELAXATION
))
324 return this->do_may_relax();
327 // Perform a relaxation pass. Return true if layout may be changed.
329 relax(int pass
, const Input_objects
* input_objects
, Symbol_table
* symtab
,
330 Layout
* layout
, const Task
* task
)
332 // Run the dummy relaxation pass twice if relaxation debugging is enabled.
333 if (is_debugging_enabled(DEBUG_RELAXATION
))
336 return this->do_relax(pass
, input_objects
, symtab
, layout
, task
);
339 // Return the target-specific name of attributes section. This is
340 // NULL if a target does not use attributes section or if it uses
341 // the default section name ".gnu.attributes".
343 attributes_section() const
344 { return this->pti_
->attributes_section
; }
346 // Return the vendor name of vendor attributes.
348 attributes_vendor() const
349 { return this->pti_
->attributes_vendor
; }
351 // Whether a section called NAME is an attribute section.
353 is_attributes_section(const char* name
) const
355 return ((this->pti_
->attributes_section
!= NULL
356 && strcmp(name
, this->pti_
->attributes_section
) == 0)
357 || strcmp(name
, ".gnu.attributes") == 0);
360 // Return a bit mask of argument types for attribute with TAG.
362 attribute_arg_type(int tag
) const
363 { return this->do_attribute_arg_type(tag
); }
365 // Return the attribute tag of the position NUM in the list of fixed
366 // attributes. Normally there is no reordering and
367 // attributes_order(NUM) == NUM.
369 attributes_order(int num
) const
370 { return this->do_attributes_order(num
); }
372 // When a target is selected as the default target, we call this method,
373 // which may be used for expensive, target-specific initialization.
375 select_as_default_target()
376 { this->do_select_as_default_target(); }
379 // This struct holds the constant information for a child class. We
380 // use a struct to avoid the overhead of virtual function calls for
381 // simple information.
384 // Address size (32 or 64).
386 // Whether the target is big endian.
388 // The code to store in the e_machine field of the ELF header.
389 elfcpp::EM machine_code
;
390 // Whether this target has a specific make_symbol function.
391 bool has_make_symbol
;
392 // Whether this target has a specific resolve function.
394 // Whether this target has a specific code fill function.
396 // Whether an object file with no .note.GNU-stack sections implies
397 // that the stack should be executable.
398 bool is_default_stack_executable
;
399 // Whether a relocation to a merged section can be processed to
400 // retrieve the contents.
401 bool can_icf_inline_merge_sections
;
402 // Prefix character to strip when checking for wrapping.
404 // The default dynamic linker name.
405 const char* dynamic_linker
;
406 // The default text segment address.
407 uint64_t default_text_segment_address
;
408 // The ABI specified page size.
409 uint64_t abi_pagesize
;
410 // The common page size used by actual implementations.
411 uint64_t common_pagesize
;
412 // The special section index for small common symbols; SHN_UNDEF
414 elfcpp::Elf_Half small_common_shndx
;
415 // The special section index for large common symbols; SHN_UNDEF
417 elfcpp::Elf_Half large_common_shndx
;
418 // Section flags for small common section.
419 elfcpp::Elf_Xword small_common_section_flags
;
420 // Section flags for large common section.
421 elfcpp::Elf_Xword large_common_section_flags
;
422 // Name of attributes section if it is not ".gnu.attributes".
423 const char* attributes_section
;
424 // Vendor name of vendor attributes.
425 const char* attributes_vendor
;
428 Target(const Target_info
* pti
)
429 : pti_(pti
), processor_specific_flags_(0),
430 are_processor_specific_flags_set_(false)
433 // Virtual function which may be implemented by the child class.
435 do_new_output_section(Output_section
*) const
438 // Virtual function which may be implemented by the child class.
440 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*)
443 // Virtual function which may be implemented by the child class.
445 do_dynsym_value(const Symbol
*) const
446 { gold_unreachable(); }
448 // Virtual function which must be implemented by the child class if
451 do_code_fill(section_size_type
) const
452 { gold_unreachable(); }
454 // Virtual function which may be implemented by the child class.
456 do_is_defined_by_abi(const Symbol
*) const
459 // Adjust the output file header before it is written out. VIEW
460 // points to the header in external form. LEN is the length, and
461 // will be one of the values of elfcpp::Elf_sizes<size>::ehdr_size.
462 // By default, we do nothing.
464 do_adjust_elf_header(unsigned char*, int) const
467 // Virtual function which may be overridden by the child class.
469 do_is_local_label_name(const char*) const;
471 // Virtual function that must be overridden by a target which uses
472 // target specific relocations.
474 do_reloc_symbol_index(void*, unsigned int) const
475 { gold_unreachable(); }
477 // Virtual function that must be overridden by a target which uses
478 // target specific relocations.
480 do_reloc_addend(void*, unsigned int, uint64_t) const
481 { gold_unreachable(); }
483 // Virtual functions that must be overridden by a target that uses
484 // STT_GNU_IFUNC symbols.
486 do_plt_section_for_global(const Symbol
*) const
487 { gold_unreachable(); }
490 do_plt_section_for_local(const Relobj
*, unsigned int) const
491 { gold_unreachable(); }
493 // Virtual function which may be overriden by the child class.
495 do_can_check_for_function_pointers() const
498 // Virtual function which may be overridden by the child class. We
499 // recognize some default sections for which we don't care whether
500 // they have function pointers.
502 do_section_may_have_icf_unsafe_pointers(const char* section_name
) const
504 // We recognize sections for normal vtables, construction vtables and
506 return (!is_prefix_of(".rodata._ZTV", section_name
)
507 && !is_prefix_of(".data.rel.ro._ZTV", section_name
)
508 && !is_prefix_of(".rodata._ZTC", section_name
)
509 && !is_prefix_of(".data.rel.ro._ZTC", section_name
)
510 && !is_prefix_of(".eh_frame", section_name
));
513 // Virtual function which may be overridden by the child class. The
514 // default implementation is that any function not defined by the
515 // ABI is a call to a non-split function.
517 do_is_call_to_non_split(const Symbol
* sym
, unsigned int) const;
519 // Virtual function which may be overridden by the child class.
521 do_calls_non_split(Relobj
* object
, unsigned int, section_offset_type
,
522 section_size_type
, unsigned char*, section_size_type
,
523 std::string
*, std::string
*) const;
525 // make_elf_object hooks. There are four versions of these for
526 // different address sizes and endianness.
528 // Set processor specific flags.
530 set_processor_specific_flags(elfcpp::Elf_Word flags
)
532 this->processor_specific_flags_
= flags
;
533 this->are_processor_specific_flags_set_
= true;
536 #ifdef HAVE_TARGET_32_LITTLE
537 // Virtual functions which may be overridden by the child class.
539 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
540 const elfcpp::Ehdr
<32, false>&);
543 #ifdef HAVE_TARGET_32_BIG
544 // Virtual functions which may be overridden by the child class.
546 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
547 const elfcpp::Ehdr
<32, true>&);
550 #ifdef HAVE_TARGET_64_LITTLE
551 // Virtual functions which may be overridden by the child class.
553 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
554 const elfcpp::Ehdr
<64, false>& ehdr
);
557 #ifdef HAVE_TARGET_64_BIG
558 // Virtual functions which may be overridden by the child class.
560 do_make_elf_object(const std::string
& name
, Input_file
* input_file
,
561 off_t offset
, const elfcpp::Ehdr
<64, true>& ehdr
);
564 // Virtual functions which may be overridden by the child class.
565 virtual Output_section
*
566 do_make_output_section(const char* name
, elfcpp::Elf_Word type
,
567 elfcpp::Elf_Xword flags
);
569 // Virtual function which may be overridden by the child class.
572 { return parameters
->options().relax(); }
574 // Virtual function which may be overridden by the child class.
576 do_relax(int, const Input_objects
*, Symbol_table
*, Layout
*, const Task
*)
579 // A function for targets to call. Return whether BYTES/LEN matches
580 // VIEW/VIEW_SIZE at OFFSET.
582 match_view(const unsigned char* view
, section_size_type view_size
,
583 section_offset_type offset
, const char* bytes
, size_t len
) const;
585 // Set the contents of a VIEW/VIEW_SIZE to nops starting at OFFSET
588 set_view_to_nop(unsigned char* view
, section_size_type view_size
,
589 section_offset_type offset
, size_t len
) const;
591 // This must be overridden by the child class if it has target-specific
592 // attributes subsection in the attribute section.
594 do_attribute_arg_type(int) const
595 { gold_unreachable(); }
597 // This may be overridden by the child class.
599 do_attributes_order(int num
) const
602 // This may be overridden by the child class.
604 do_select_as_default_target()
608 // The implementations of the four do_make_elf_object virtual functions are
609 // almost identical except for their sizes and endianness. We use a template.
610 // for their implementations.
611 template<int size
, bool big_endian
>
613 do_make_elf_object_implementation(const std::string
&, Input_file
*, off_t
,
614 const elfcpp::Ehdr
<size
, big_endian
>&);
616 Target(const Target
&);
617 Target
& operator=(const Target
&);
619 // The target information.
620 const Target_info
* pti_
;
621 // Processor-specific flags.
622 elfcpp::Elf_Word processor_specific_flags_
;
623 // Whether the processor-specific flags are set at least once.
624 bool are_processor_specific_flags_set_
;
627 // The abstract class for a specific size and endianness of target.
628 // Each actual target implementation class should derive from an
629 // instantiation of Sized_target.
631 template<int size
, bool big_endian
>
632 class Sized_target
: public Target
635 // Make a new symbol table entry for the target. This should be
636 // overridden by a target which needs additional information in the
637 // symbol table. This will only be called if has_make_symbol()
639 virtual Sized_symbol
<size
>*
641 { gold_unreachable(); }
643 // Resolve a symbol for the target. This should be overridden by a
644 // target which needs to take special action. TO is the
645 // pre-existing symbol. SYM is the new symbol, seen in OBJECT.
646 // VERSION is the version of SYM. This will only be called if
647 // has_resolve() returns true.
649 resolve(Symbol
*, const elfcpp::Sym
<size
, big_endian
>&, Object
*,
651 { gold_unreachable(); }
653 // Process the relocs for a section, and record information of the
654 // mapping from source to destination sections. This mapping is later
655 // used to determine unreferenced garbage sections. This procedure is
656 // only called during garbage collection.
658 gc_process_relocs(Symbol_table
* symtab
,
660 Sized_relobj_file
<size
, big_endian
>* object
,
661 unsigned int data_shndx
,
662 unsigned int sh_type
,
663 const unsigned char* prelocs
,
665 Output_section
* output_section
,
666 bool needs_special_offset_handling
,
667 size_t local_symbol_count
,
668 const unsigned char* plocal_symbols
) = 0;
670 // Scan the relocs for a section, and record any information
671 // required for the symbol. SYMTAB is the symbol table. OBJECT is
672 // the object in which the section appears. DATA_SHNDX is the
673 // section index that these relocs apply to. SH_TYPE is the type of
674 // the relocation section, SHT_REL or SHT_RELA. PRELOCS points to
675 // the relocation data. RELOC_COUNT is the number of relocs.
676 // LOCAL_SYMBOL_COUNT is the number of local symbols.
677 // OUTPUT_SECTION is the output section.
678 // NEEDS_SPECIAL_OFFSET_HANDLING is true if offsets to the output
679 // sections are not mapped as usual. PLOCAL_SYMBOLS points to the
680 // local symbol data from OBJECT. GLOBAL_SYMBOLS is the array of
681 // pointers to the global symbol table from OBJECT.
683 scan_relocs(Symbol_table
* symtab
,
685 Sized_relobj_file
<size
, big_endian
>* object
,
686 unsigned int data_shndx
,
687 unsigned int sh_type
,
688 const unsigned char* prelocs
,
690 Output_section
* output_section
,
691 bool needs_special_offset_handling
,
692 size_t local_symbol_count
,
693 const unsigned char* plocal_symbols
) = 0;
695 // Relocate section data. SH_TYPE is the type of the relocation
696 // section, SHT_REL or SHT_RELA. PRELOCS points to the relocation
697 // information. RELOC_COUNT is the number of relocs.
698 // OUTPUT_SECTION is the output section.
699 // NEEDS_SPECIAL_OFFSET_HANDLING is true if offsets must be mapped
700 // to correspond to the output section. VIEW is a view into the
701 // output file holding the section contents, VIEW_ADDRESS is the
702 // virtual address of the view, and VIEW_SIZE is the size of the
703 // view. If NEEDS_SPECIAL_OFFSET_HANDLING is true, the VIEW_xx
704 // parameters refer to the complete output section data, not just
705 // the input section data.
707 relocate_section(const Relocate_info
<size
, big_endian
>*,
708 unsigned int sh_type
,
709 const unsigned char* prelocs
,
711 Output_section
* output_section
,
712 bool needs_special_offset_handling
,
714 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
715 section_size_type view_size
,
716 const Reloc_symbol_changes
*) = 0;
718 // Scan the relocs during a relocatable link. The parameters are
719 // like scan_relocs, with an additional Relocatable_relocs
720 // parameter, used to record the disposition of the relocs.
722 scan_relocatable_relocs(Symbol_table
* symtab
,
724 Sized_relobj_file
<size
, big_endian
>* object
,
725 unsigned int data_shndx
,
726 unsigned int sh_type
,
727 const unsigned char* prelocs
,
729 Output_section
* output_section
,
730 bool needs_special_offset_handling
,
731 size_t local_symbol_count
,
732 const unsigned char* plocal_symbols
,
733 Relocatable_relocs
*) = 0;
735 // Relocate a section during a relocatable link. The parameters are
736 // like relocate_section, with additional parameters for the view of
737 // the output reloc section.
739 relocate_for_relocatable(const Relocate_info
<size
, big_endian
>*,
740 unsigned int sh_type
,
741 const unsigned char* prelocs
,
743 Output_section
* output_section
,
744 off_t offset_in_output_section
,
745 const Relocatable_relocs
*,
747 typename
elfcpp::Elf_types
<size
>::Elf_Addr
749 section_size_type view_size
,
750 unsigned char* reloc_view
,
751 section_size_type reloc_view_size
) = 0;
753 // Perform target-specific processing in a relocatable link. This is
754 // only used if we use the relocation strategy RELOC_SPECIAL.
755 // RELINFO points to a Relocation_info structure. SH_TYPE is the relocation
756 // section type. PRELOC_IN points to the original relocation. RELNUM is
757 // the index number of the relocation in the relocation section.
758 // OUTPUT_SECTION is the output section to which the relocation is applied.
759 // OFFSET_IN_OUTPUT_SECTION is the offset of the relocation input section
760 // within the output section. VIEW points to the output view of the
761 // output section. VIEW_ADDRESS is output address of the view. VIEW_SIZE
762 // is the size of the output view and PRELOC_OUT points to the new
763 // relocation in the output object.
765 // A target only needs to override this if the generic code in
766 // target-reloc.h cannot handle some relocation types.
769 relocate_special_relocatable(const Relocate_info
<size
, big_endian
>*
771 unsigned int /* sh_type */,
772 const unsigned char* /* preloc_in */,
774 Output_section
* /* output_section */,
775 off_t
/* offset_in_output_section */,
776 unsigned char* /* view */,
777 typename
elfcpp::Elf_types
<size
>::Elf_Addr
779 section_size_type
/* view_size */,
780 unsigned char* /* preloc_out*/)
781 { gold_unreachable(); }
783 // Return the number of entries in the GOT. This is only used for
784 // laying out the incremental link info sections. A target needs
785 // to implement this to support incremental linking.
788 got_entry_count() const
789 { gold_unreachable(); }
791 // Return the number of entries in the PLT. This is only used for
792 // laying out the incremental link info sections. A target needs
793 // to implement this to support incremental linking.
796 plt_entry_count() const
797 { gold_unreachable(); }
799 // Return the offset of the first non-reserved PLT entry. This is
800 // only used for laying out the incremental link info sections.
801 // A target needs to implement this to support incremental linking.
804 first_plt_entry_offset() const
805 { gold_unreachable(); }
807 // Return the size of each PLT entry. This is only used for
808 // laying out the incremental link info sections. A target needs
809 // to implement this to support incremental linking.
812 plt_entry_size() const
813 { gold_unreachable(); }
815 // Create the GOT and PLT sections for an incremental update.
816 // A target needs to implement this to support incremental linking.
818 virtual Output_data_got
<size
, big_endian
>*
819 init_got_plt_for_update(Symbol_table
*,
821 unsigned int /* got_count */,
822 unsigned int /* plt_count */)
823 { gold_unreachable(); }
825 // Reserve a GOT entry for a local symbol, and regenerate any
826 // necessary dynamic relocations.
828 reserve_local_got_entry(unsigned int /* got_index */,
829 Sized_relobj
<size
, big_endian
>* /* obj */,
830 unsigned int /* r_sym */,
831 unsigned int /* got_type */)
832 { gold_unreachable(); }
834 // Reserve a GOT entry for a global symbol, and regenerate any
835 // necessary dynamic relocations.
837 reserve_global_got_entry(unsigned int /* got_index */, Symbol
* /* gsym */,
838 unsigned int /* got_type */)
839 { gold_unreachable(); }
841 // Register an existing PLT entry for a global symbol.
842 // A target needs to implement this to support incremental linking.
845 register_global_plt_entry(unsigned int /* plt_index */,
847 { gold_unreachable(); }
849 // Force a COPY relocation for a given symbol.
850 // A target needs to implement this to support incremental linking.
853 emit_copy_reloc(Symbol_table
*, Symbol
*, Output_section
*, off_t
)
854 { gold_unreachable(); }
856 // Apply an incremental relocation.
859 apply_relocation(const Relocate_info
<size
, big_endian
>* /* relinfo */,
860 typename
elfcpp::Elf_types
<size
>::Elf_Addr
/* r_offset */,
861 unsigned int /* r_type */,
862 typename
elfcpp::Elf_types
<size
>::Elf_Swxword
/* r_addend */,
863 const Symbol
* /* gsym */,
864 unsigned char* /* view */,
865 typename
elfcpp::Elf_types
<size
>::Elf_Addr
/* address */,
866 section_size_type
/* view_size */)
867 { gold_unreachable(); }
870 Sized_target(const Target::Target_info
* pti
)
873 gold_assert(pti
->size
== size
);
874 gold_assert(pti
->is_big_endian
? big_endian
: !big_endian
);
878 } // End namespace gold.
880 #endif // !defined(GOLD_TARGET_H)