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14bfc3f5 | 1 | // target.h -- target support for gold -*- C++ -*- |
bae7f79e | 2 | |
6f2750fe | 3 | // Copyright (C) 2006-2016 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
bae7f79e ILT |
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. | |
27 | ||
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. | |
32 | ||
33 | #ifndef GOLD_TARGET_H | |
34 | #define GOLD_TARGET_H | |
35 | ||
14bfc3f5 | 36 | #include "elfcpp.h" |
8851ecca | 37 | #include "options.h" |
cd72c291 | 38 | #include "parameters.h" |
98ff9231 | 39 | #include "stringpool.h" |
20e6d0d6 | 40 | #include "debug.h" |
14bfc3f5 | 41 | |
bae7f79e ILT |
42 | namespace gold |
43 | { | |
44 | ||
14bfc3f5 | 45 | class Object; |
364c7fa5 | 46 | class Relobj; |
61ba1cf9 | 47 | template<int size, bool big_endian> |
f6ce93d6 | 48 | class Sized_relobj; |
6fa2a40b CC |
49 | template<int size, bool big_endian> |
50 | class Sized_relobj_file; | |
6a74a719 | 51 | class Relocatable_relocs; |
92e059d8 | 52 | template<int size, bool big_endian> |
2c54b4f4 | 53 | struct Relocate_info; |
364c7fa5 | 54 | class Reloc_symbol_changes; |
f6ce93d6 ILT |
55 | class Symbol; |
56 | template<int size> | |
57 | class Sized_symbol; | |
58 | class Symbol_table; | |
7223e9ca | 59 | class Output_data; |
dd74ae06 | 60 | class Output_data_got_base; |
730cdc88 | 61 | class Output_section; |
d5b40221 | 62 | class Input_objects; |
f625ae50 | 63 | class Task; |
dc3714f3 | 64 | struct Symbol_location; |
98ff9231 | 65 | class Versions; |
14bfc3f5 ILT |
66 | |
67 | // The abstract class for target specific handling. | |
68 | ||
bae7f79e ILT |
69 | class Target |
70 | { | |
71 | public: | |
14bfc3f5 ILT |
72 | virtual ~Target() |
73 | { } | |
74 | ||
75 | // Return the bit size that this target implements. This should | |
76 | // return 32 or 64. | |
77 | int | |
78 | get_size() const | |
75f65a3e | 79 | { return this->pti_->size; } |
14bfc3f5 ILT |
80 | |
81 | // Return whether this target is big-endian. | |
82 | bool | |
83 | is_big_endian() const | |
75f65a3e | 84 | { return this->pti_->is_big_endian; } |
14bfc3f5 | 85 | |
61ba1cf9 ILT |
86 | // Machine code to store in e_machine field of ELF header. |
87 | elfcpp::EM | |
88 | machine_code() const | |
89 | { return this->pti_->machine_code; } | |
90 | ||
d5b40221 DK |
91 | // Processor specific flags to store in e_flags field of ELF header. |
92 | elfcpp::Elf_Word | |
93 | processor_specific_flags() const | |
94 | { return this->processor_specific_flags_; } | |
95 | ||
96 | // Whether processor specific flags are set at least once. | |
97 | bool | |
98 | are_processor_specific_flags_set() const | |
99 | { return this->are_processor_specific_flags_set_; } | |
100 | ||
14bfc3f5 ILT |
101 | // Whether this target has a specific make_symbol function. |
102 | bool | |
103 | has_make_symbol() const | |
75f65a3e | 104 | { return this->pti_->has_make_symbol; } |
14bfc3f5 ILT |
105 | |
106 | // Whether this target has a specific resolve function. | |
107 | bool | |
108 | has_resolve() const | |
75f65a3e ILT |
109 | { return this->pti_->has_resolve; } |
110 | ||
c51e6221 ILT |
111 | // Whether this target has a specific code fill function. |
112 | bool | |
113 | has_code_fill() const | |
114 | { return this->pti_->has_code_fill; } | |
115 | ||
dbe717ef ILT |
116 | // Return the default name of the dynamic linker. |
117 | const char* | |
118 | dynamic_linker() const | |
119 | { return this->pti_->dynamic_linker; } | |
120 | ||
75f65a3e ILT |
121 | // Return the default address to use for the text segment. |
122 | uint64_t | |
0c5e9c22 ILT |
123 | default_text_segment_address() const |
124 | { return this->pti_->default_text_segment_address; } | |
75f65a3e ILT |
125 | |
126 | // Return the ABI specified page size. | |
127 | uint64_t | |
128 | abi_pagesize() const | |
cd72c291 | 129 | { |
8851ecca ILT |
130 | if (parameters->options().max_page_size() > 0) |
131 | return parameters->options().max_page_size(); | |
cd72c291 ILT |
132 | else |
133 | return this->pti_->abi_pagesize; | |
134 | } | |
75f65a3e ILT |
135 | |
136 | // Return the common page size used on actual systems. | |
137 | uint64_t | |
138 | common_pagesize() const | |
cd72c291 | 139 | { |
8851ecca ILT |
140 | if (parameters->options().common_page_size() > 0) |
141 | return std::min(parameters->options().common_page_size(), | |
cd72c291 ILT |
142 | this->abi_pagesize()); |
143 | else | |
144 | return std::min(this->pti_->common_pagesize, | |
145 | this->abi_pagesize()); | |
146 | } | |
14bfc3f5 | 147 | |
2e702c99 RM |
148 | // Return whether PF_X segments must contain nothing but the contents of |
149 | // SHF_EXECINSTR sections (no non-executable data, no headers). | |
150 | bool | |
151 | isolate_execinstr() const | |
152 | { return this->pti_->isolate_execinstr; } | |
153 | ||
154 | uint64_t | |
155 | rosegment_gap() const | |
156 | { return this->pti_->rosegment_gap; } | |
157 | ||
35cdfc9a ILT |
158 | // If we see some object files with .note.GNU-stack sections, and |
159 | // some objects files without them, this returns whether we should | |
160 | // consider the object files without them to imply that the stack | |
161 | // should be executable. | |
162 | bool | |
163 | is_default_stack_executable() const | |
164 | { return this->pti_->is_default_stack_executable; } | |
165 | ||
0864d551 ILT |
166 | // Return a character which may appear as a prefix for a wrap |
167 | // symbol. If this character appears, we strip it when checking for | |
168 | // wrapping and add it back when forming the final symbol name. | |
169 | // This should be '\0' if not special prefix is required, which is | |
170 | // the normal case. | |
171 | char | |
172 | wrap_char() const | |
173 | { return this->pti_->wrap_char; } | |
174 | ||
8a5e3e08 ILT |
175 | // Return the special section index which indicates a small common |
176 | // symbol. This will return SHN_UNDEF if there are no small common | |
177 | // symbols. | |
178 | elfcpp::Elf_Half | |
179 | small_common_shndx() const | |
180 | { return this->pti_->small_common_shndx; } | |
181 | ||
182 | // Return values to add to the section flags for the section holding | |
183 | // small common symbols. | |
184 | elfcpp::Elf_Xword | |
185 | small_common_section_flags() const | |
186 | { | |
187 | gold_assert(this->pti_->small_common_shndx != elfcpp::SHN_UNDEF); | |
188 | return this->pti_->small_common_section_flags; | |
189 | } | |
190 | ||
191 | // Return the special section index which indicates a large common | |
192 | // symbol. This will return SHN_UNDEF if there are no large common | |
193 | // symbols. | |
194 | elfcpp::Elf_Half | |
195 | large_common_shndx() const | |
196 | { return this->pti_->large_common_shndx; } | |
197 | ||
198 | // Return values to add to the section flags for the section holding | |
199 | // large common symbols. | |
200 | elfcpp::Elf_Xword | |
201 | large_common_section_flags() const | |
202 | { | |
203 | gold_assert(this->pti_->large_common_shndx != elfcpp::SHN_UNDEF); | |
204 | return this->pti_->large_common_section_flags; | |
205 | } | |
206 | ||
207 | // This hook is called when an output section is created. | |
208 | void | |
209 | new_output_section(Output_section* os) const | |
210 | { this->do_new_output_section(os); } | |
211 | ||
5a6f7e2d ILT |
212 | // This is called to tell the target to complete any sections it is |
213 | // handling. After this all sections must have their final size. | |
214 | void | |
f59f41f3 DK |
215 | finalize_sections(Layout* layout, const Input_objects* input_objects, |
216 | Symbol_table* symtab) | |
217 | { return this->do_finalize_sections(layout, input_objects, symtab); } | |
5a6f7e2d | 218 | |
ab5c9e90 ILT |
219 | // Return the value to use for a global symbol which needs a special |
220 | // value in the dynamic symbol table. This will only be called if | |
221 | // the backend first calls symbol->set_needs_dynsym_value(). | |
222 | uint64_t | |
223 | dynsym_value(const Symbol* sym) const | |
224 | { return this->do_dynsym_value(sym); } | |
225 | ||
c51e6221 ILT |
226 | // Return a string to use to fill out a code section. This is |
227 | // basically one or more NOPS which must fill out the specified | |
228 | // length in bytes. | |
229 | std::string | |
8851ecca | 230 | code_fill(section_size_type length) const |
c51e6221 ILT |
231 | { return this->do_code_fill(length); } |
232 | ||
9a2d6984 ILT |
233 | // Return whether SYM is known to be defined by the ABI. This is |
234 | // used to avoid inappropriate warnings about undefined symbols. | |
235 | bool | |
9c2d0ef9 | 236 | is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
237 | { return this->do_is_defined_by_abi(sym); } |
238 | ||
36959681 ILT |
239 | // Adjust the output file header before it is written out. VIEW |
240 | // points to the header in external form. LEN is the length. | |
241 | void | |
cc84c10b | 242 | adjust_elf_header(unsigned char* view, int len) |
36959681 ILT |
243 | { return this->do_adjust_elf_header(view, len); } |
244 | ||
9d5781f8 AM |
245 | // Return address and size to plug into eh_frame FDEs associated with a PLT. |
246 | void | |
247 | plt_fde_location(const Output_data* plt, unsigned char* oview, | |
248 | uint64_t* address, off_t* len) const | |
249 | { return this->do_plt_fde_location(plt, oview, address, len); } | |
250 | ||
bb04269c DK |
251 | // Return whether NAME is a local label name. This is used to implement the |
252 | // --discard-locals options. | |
253 | bool | |
254 | is_local_label_name(const char* name) const | |
255 | { return this->do_is_local_label_name(name); } | |
256 | ||
e291e7b9 ILT |
257 | // Get the symbol index to use for a target specific reloc. |
258 | unsigned int | |
259 | reloc_symbol_index(void* arg, unsigned int type) const | |
260 | { return this->do_reloc_symbol_index(arg, type); } | |
261 | ||
262 | // Get the addend to use for a target specific reloc. | |
263 | uint64_t | |
264 | reloc_addend(void* arg, unsigned int type, uint64_t addend) const | |
265 | { return this->do_reloc_addend(arg, type, addend); } | |
266 | ||
19fec8c1 | 267 | // Return the PLT address to use for a global symbol. |
67181c72 ILT |
268 | uint64_t |
269 | plt_address_for_global(const Symbol* sym) const | |
270 | { return this->do_plt_address_for_global(sym); } | |
271 | ||
19fec8c1 | 272 | // Return the PLT address to use for a local symbol. |
67181c72 ILT |
273 | uint64_t |
274 | plt_address_for_local(const Relobj* object, unsigned int symndx) const | |
275 | { return this->do_plt_address_for_local(object, symndx); } | |
7223e9ca | 276 | |
bd73a62d AM |
277 | // Return the offset to use for the GOT_INDX'th got entry which is |
278 | // for a local tls symbol specified by OBJECT, SYMNDX. | |
279 | int64_t | |
280 | tls_offset_for_local(const Relobj* object, | |
281 | unsigned int symndx, | |
282 | unsigned int got_indx) const | |
283 | { return do_tls_offset_for_local(object, symndx, got_indx); } | |
284 | ||
285 | // Return the offset to use for the GOT_INDX'th got entry which is | |
286 | // for global tls symbol GSYM. | |
287 | int64_t | |
288 | tls_offset_for_global(Symbol* gsym, unsigned int got_indx) const | |
289 | { return do_tls_offset_for_global(gsym, got_indx); } | |
290 | ||
dc3714f3 AM |
291 | // For targets that use function descriptors, if LOC is the location |
292 | // of a function, modify it to point at the function entry location. | |
293 | void | |
294 | function_location(Symbol_location* loc) const | |
295 | { return do_function_location(loc); } | |
296 | ||
b3ce541e ILT |
297 | // Return whether this target can use relocation types to determine |
298 | // if a function's address is taken. | |
299 | bool | |
300 | can_check_for_function_pointers() const | |
301 | { return this->do_can_check_for_function_pointers(); } | |
302 | ||
303 | // Return whether a relocation to a merged section can be processed | |
304 | // to retrieve the contents. | |
305 | bool | |
306 | can_icf_inline_merge_sections () const | |
307 | { return this->pti_->can_icf_inline_merge_sections; } | |
308 | ||
309 | // Whether a section called SECTION_NAME may have function pointers to | |
310 | // sections not eligible for safe ICF folding. | |
311 | virtual bool | |
312 | section_may_have_icf_unsafe_pointers(const char* section_name) const | |
313 | { return this->do_section_may_have_icf_unsafe_pointers(section_name); } | |
314 | ||
02d7cd44 ILT |
315 | // Return the base to use for the PC value in an FDE when it is |
316 | // encoded using DW_EH_PE_datarel. This does not appear to be | |
317 | // documented anywhere, but it is target specific. Any use of | |
318 | // DW_EH_PE_datarel in gcc requires defining a special macro | |
319 | // (ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX) to output the value. | |
320 | uint64_t | |
321 | ehframe_datarel_base() const | |
322 | { return this->do_ehframe_datarel_base(); } | |
323 | ||
4d625b70 | 324 | // Return true if a reference to SYM from a reloc at *PRELOC |
b6848d3c ILT |
325 | // means that the current function may call an object compiled |
326 | // without -fsplit-stack. SYM is known to be defined in an object | |
327 | // compiled without -fsplit-stack. | |
328 | bool | |
bd8d853f MK |
329 | is_call_to_non_split(const Symbol* sym, const unsigned char* preloc, |
330 | const unsigned char* view, | |
331 | section_size_type view_size) const | |
332 | { return this->do_is_call_to_non_split(sym, preloc, view, view_size); } | |
b6848d3c | 333 | |
364c7fa5 ILT |
334 | // A function starts at OFFSET in section SHNDX in OBJECT. That |
335 | // function was compiled with -fsplit-stack, but it refers to a | |
336 | // function which was compiled without -fsplit-stack. VIEW is a | |
337 | // modifiable view of the section; VIEW_SIZE is the size of the | |
338 | // view. The target has to adjust the function so that it allocates | |
339 | // enough stack. | |
340 | void | |
341 | calls_non_split(Relobj* object, unsigned int shndx, | |
342 | section_offset_type fnoffset, section_size_type fnsize, | |
6e0813d3 | 343 | const unsigned char* prelocs, size_t reloc_count, |
364c7fa5 ILT |
344 | unsigned char* view, section_size_type view_size, |
345 | std::string* from, std::string* to) const | |
346 | { | |
6e0813d3 CC |
347 | this->do_calls_non_split(object, shndx, fnoffset, fnsize, |
348 | prelocs, reloc_count, view, view_size, | |
364c7fa5 ILT |
349 | from, to); |
350 | } | |
351 | ||
f733487b DK |
352 | // Make an ELF object. |
353 | template<int size, bool big_endian> | |
354 | Object* | |
355 | make_elf_object(const std::string& name, Input_file* input_file, | |
356 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
357 | { return this->do_make_elf_object(name, input_file, offset, ehdr); } | |
358 | ||
c0a62865 DK |
359 | // Make an output section. |
360 | Output_section* | |
361 | make_output_section(const char* name, elfcpp::Elf_Word type, | |
362 | elfcpp::Elf_Xword flags) | |
363 | { return this->do_make_output_section(name, type, flags); } | |
364 | ||
20e6d0d6 DK |
365 | // Return true if target wants to perform relaxation. |
366 | bool | |
367 | may_relax() const | |
368 | { | |
369 | // Run the dummy relaxation pass twice if relaxation debugging is enabled. | |
370 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
371 | return true; | |
372 | ||
373 | return this->do_may_relax(); | |
374 | } | |
375 | ||
376 | // Perform a relaxation pass. Return true if layout may be changed. | |
377 | bool | |
c0a62865 | 378 | relax(int pass, const Input_objects* input_objects, Symbol_table* symtab, |
f625ae50 | 379 | Layout* layout, const Task* task) |
20e6d0d6 DK |
380 | { |
381 | // Run the dummy relaxation pass twice if relaxation debugging is enabled. | |
382 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
383 | return pass < 2; | |
384 | ||
f625ae50 | 385 | return this->do_relax(pass, input_objects, symtab, layout, task); |
2e702c99 | 386 | } |
20e6d0d6 | 387 | |
05a352e6 DK |
388 | // Return the target-specific name of attributes section. This is |
389 | // NULL if a target does not use attributes section or if it uses | |
390 | // the default section name ".gnu.attributes". | |
391 | const char* | |
392 | attributes_section() const | |
393 | { return this->pti_->attributes_section; } | |
394 | ||
395 | // Return the vendor name of vendor attributes. | |
396 | const char* | |
397 | attributes_vendor() const | |
398 | { return this->pti_->attributes_vendor; } | |
399 | ||
400 | // Whether a section called NAME is an attribute section. | |
401 | bool | |
402 | is_attributes_section(const char* name) const | |
403 | { | |
404 | return ((this->pti_->attributes_section != NULL | |
405 | && strcmp(name, this->pti_->attributes_section) == 0) | |
2e702c99 | 406 | || strcmp(name, ".gnu.attributes") == 0); |
05a352e6 DK |
407 | } |
408 | ||
409 | // Return a bit mask of argument types for attribute with TAG. | |
410 | int | |
411 | attribute_arg_type(int tag) const | |
412 | { return this->do_attribute_arg_type(tag); } | |
413 | ||
414 | // Return the attribute tag of the position NUM in the list of fixed | |
415 | // attributes. Normally there is no reordering and | |
416 | // attributes_order(NUM) == NUM. | |
417 | int | |
418 | attributes_order(int num) const | |
419 | { return this->do_attributes_order(num); } | |
420 | ||
0d31c79d DK |
421 | // When a target is selected as the default target, we call this method, |
422 | // which may be used for expensive, target-specific initialization. | |
423 | void | |
424 | select_as_default_target() | |
2e702c99 | 425 | { this->do_select_as_default_target(); } |
0d31c79d | 426 | |
200b2bb9 ILT |
427 | // Return the value to store in the EI_OSABI field in the ELF |
428 | // header. | |
429 | elfcpp::ELFOSABI | |
430 | osabi() const | |
431 | { return this->osabi_; } | |
432 | ||
433 | // Set the value to store in the EI_OSABI field in the ELF header. | |
434 | void | |
435 | set_osabi(elfcpp::ELFOSABI osabi) | |
436 | { this->osabi_ = osabi; } | |
437 | ||
647f1574 DK |
438 | // Define target-specific standard symbols. |
439 | void | |
440 | define_standard_symbols(Symbol_table* symtab, Layout* layout) | |
441 | { this->do_define_standard_symbols(symtab, layout); } | |
442 | ||
921b5322 AM |
443 | // Return the output section name to use given an input section |
444 | // name, or NULL if no target specific name mapping is required. | |
445 | // Set *PLEN to the length of the name if returning non-NULL. | |
446 | const char* | |
447 | output_section_name(const Relobj* relobj, | |
448 | const char* name, | |
449 | size_t* plen) const | |
450 | { return this->do_output_section_name(relobj, name, plen); } | |
451 | ||
e81fea4d AM |
452 | // Add any special sections for this symbol to the gc work list. |
453 | void | |
454 | gc_mark_symbol(Symbol_table* symtab, Symbol* sym) const | |
455 | { this->do_gc_mark_symbol(symtab, sym); } | |
456 | ||
a67858e0 CC |
457 | // Return the name of the entry point symbol. |
458 | const char* | |
459 | entry_symbol_name() const | |
460 | { return this->pti_->entry_symbol_name; } | |
461 | ||
8d9743bd MK |
462 | // Return the size in bits of SHT_HASH entry. |
463 | int | |
464 | hash_entry_size() const | |
465 | { return this->pti_->hash_entry_size; } | |
466 | ||
98ff9231 CC |
467 | // Whether the target has a custom set_dynsym_indexes method. |
468 | bool | |
469 | has_custom_set_dynsym_indexes() const | |
470 | { return this->do_has_custom_set_dynsym_indexes(); } | |
471 | ||
472 | // Custom set_dynsym_indexes method for a target. | |
473 | unsigned int | |
474 | set_dynsym_indexes(std::vector<Symbol*>* dyn_symbols, unsigned int index, | |
475 | std::vector<Symbol*>* syms, Stringpool* dynpool, | |
476 | Versions* versions, Symbol_table* symtab) const | |
477 | { | |
478 | return this->do_set_dynsym_indexes(dyn_symbols, index, syms, dynpool, | |
479 | versions, symtab); | |
480 | } | |
481 | ||
918fc1f8 CC |
482 | // Get the custom dynamic tag value. |
483 | unsigned int | |
484 | dynamic_tag_custom_value(elfcpp::DT tag) const | |
485 | { return this->do_dynamic_tag_custom_value(tag); } | |
486 | ||
800d9823 CC |
487 | // Adjust the value written to the dynamic symbol table. |
488 | void | |
489 | adjust_dyn_symbol(const Symbol* sym, unsigned char* view) const | |
490 | { this->do_adjust_dyn_symbol(sym, view); } | |
491 | ||
99fd8cff CC |
492 | // Return whether to include the section in the link. |
493 | bool | |
494 | should_include_section(elfcpp::Elf_Word sh_type) const | |
495 | { return this->do_should_include_section(sh_type); } | |
496 | ||
14bfc3f5 | 497 | protected: |
75f65a3e ILT |
498 | // This struct holds the constant information for a child class. We |
499 | // use a struct to avoid the overhead of virtual function calls for | |
500 | // simple information. | |
501 | struct Target_info | |
502 | { | |
503 | // Address size (32 or 64). | |
504 | int size; | |
505 | // Whether the target is big endian. | |
506 | bool is_big_endian; | |
61ba1cf9 ILT |
507 | // The code to store in the e_machine field of the ELF header. |
508 | elfcpp::EM machine_code; | |
75f65a3e ILT |
509 | // Whether this target has a specific make_symbol function. |
510 | bool has_make_symbol; | |
511 | // Whether this target has a specific resolve function. | |
512 | bool has_resolve; | |
c51e6221 ILT |
513 | // Whether this target has a specific code fill function. |
514 | bool has_code_fill; | |
35cdfc9a ILT |
515 | // Whether an object file with no .note.GNU-stack sections implies |
516 | // that the stack should be executable. | |
517 | bool is_default_stack_executable; | |
b3ce541e ILT |
518 | // Whether a relocation to a merged section can be processed to |
519 | // retrieve the contents. | |
520 | bool can_icf_inline_merge_sections; | |
0864d551 ILT |
521 | // Prefix character to strip when checking for wrapping. |
522 | char wrap_char; | |
dbe717ef ILT |
523 | // The default dynamic linker name. |
524 | const char* dynamic_linker; | |
75f65a3e | 525 | // The default text segment address. |
0c5e9c22 | 526 | uint64_t default_text_segment_address; |
75f65a3e ILT |
527 | // The ABI specified page size. |
528 | uint64_t abi_pagesize; | |
529 | // The common page size used by actual implementations. | |
530 | uint64_t common_pagesize; | |
2e702c99 RM |
531 | // Whether PF_X segments must contain nothing but the contents of |
532 | // SHF_EXECINSTR sections (no non-executable data, no headers). | |
533 | bool isolate_execinstr; | |
534 | // If nonzero, distance from the text segment to the read-only segment. | |
535 | uint64_t rosegment_gap; | |
8a5e3e08 ILT |
536 | // The special section index for small common symbols; SHN_UNDEF |
537 | // if none. | |
538 | elfcpp::Elf_Half small_common_shndx; | |
539 | // The special section index for large common symbols; SHN_UNDEF | |
540 | // if none. | |
541 | elfcpp::Elf_Half large_common_shndx; | |
542 | // Section flags for small common section. | |
543 | elfcpp::Elf_Xword small_common_section_flags; | |
544 | // Section flags for large common section. | |
545 | elfcpp::Elf_Xword large_common_section_flags; | |
05a352e6 DK |
546 | // Name of attributes section if it is not ".gnu.attributes". |
547 | const char* attributes_section; | |
548 | // Vendor name of vendor attributes. | |
549 | const char* attributes_vendor; | |
a67858e0 CC |
550 | // Name of the main entry point to the program. |
551 | const char* entry_symbol_name; | |
8d9743bd MK |
552 | // Size (in bits) of SHT_HASH entry. Always equal to 32, except for |
553 | // 64-bit S/390. | |
554 | const int hash_entry_size; | |
75f65a3e ILT |
555 | }; |
556 | ||
557 | Target(const Target_info* pti) | |
d5b40221 | 558 | : pti_(pti), processor_specific_flags_(0), |
200b2bb9 | 559 | are_processor_specific_flags_set_(false), osabi_(elfcpp::ELFOSABI_NONE) |
14bfc3f5 ILT |
560 | { } |
561 | ||
8a5e3e08 ILT |
562 | // Virtual function which may be implemented by the child class. |
563 | virtual void | |
564 | do_new_output_section(Output_section*) const | |
565 | { } | |
566 | ||
5a6f7e2d ILT |
567 | // Virtual function which may be implemented by the child class. |
568 | virtual void | |
f59f41f3 | 569 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*) |
5a6f7e2d ILT |
570 | { } |
571 | ||
ab5c9e90 ILT |
572 | // Virtual function which may be implemented by the child class. |
573 | virtual uint64_t | |
574 | do_dynsym_value(const Symbol*) const | |
575 | { gold_unreachable(); } | |
576 | ||
c51e6221 ILT |
577 | // Virtual function which must be implemented by the child class if |
578 | // needed. | |
579 | virtual std::string | |
8851ecca | 580 | do_code_fill(section_size_type) const |
c51e6221 ILT |
581 | { gold_unreachable(); } |
582 | ||
9a2d6984 ILT |
583 | // Virtual function which may be implemented by the child class. |
584 | virtual bool | |
9c2d0ef9 | 585 | do_is_defined_by_abi(const Symbol*) const |
9a2d6984 ILT |
586 | { return false; } |
587 | ||
36959681 ILT |
588 | // Adjust the output file header before it is written out. VIEW |
589 | // points to the header in external form. LEN is the length, and | |
590 | // will be one of the values of elfcpp::Elf_sizes<size>::ehdr_size. | |
200b2bb9 ILT |
591 | // By default, we set the EI_OSABI field if requested (in |
592 | // Sized_target). | |
36959681 | 593 | virtual void |
cc84c10b | 594 | do_adjust_elf_header(unsigned char*, int) = 0; |
36959681 | 595 | |
9d5781f8 AM |
596 | // Return address and size to plug into eh_frame FDEs associated with a PLT. |
597 | virtual void | |
598 | do_plt_fde_location(const Output_data* plt, unsigned char* oview, | |
599 | uint64_t* address, off_t* len) const; | |
600 | ||
9b547ce6 | 601 | // Virtual function which may be overridden by the child class. |
bb04269c DK |
602 | virtual bool |
603 | do_is_local_label_name(const char*) const; | |
604 | ||
e291e7b9 ILT |
605 | // Virtual function that must be overridden by a target which uses |
606 | // target specific relocations. | |
607 | virtual unsigned int | |
608 | do_reloc_symbol_index(void*, unsigned int) const | |
609 | { gold_unreachable(); } | |
610 | ||
9b547ce6 | 611 | // Virtual function that must be overridden by a target which uses |
e291e7b9 ILT |
612 | // target specific relocations. |
613 | virtual uint64_t | |
614 | do_reloc_addend(void*, unsigned int, uint64_t) const | |
615 | { gold_unreachable(); } | |
616 | ||
7223e9ca ILT |
617 | // Virtual functions that must be overridden by a target that uses |
618 | // STT_GNU_IFUNC symbols. | |
67181c72 ILT |
619 | virtual uint64_t |
620 | do_plt_address_for_global(const Symbol*) const | |
7223e9ca ILT |
621 | { gold_unreachable(); } |
622 | ||
67181c72 ILT |
623 | virtual uint64_t |
624 | do_plt_address_for_local(const Relobj*, unsigned int) const | |
7223e9ca ILT |
625 | { gold_unreachable(); } |
626 | ||
bd73a62d AM |
627 | virtual int64_t |
628 | do_tls_offset_for_local(const Relobj*, unsigned int, unsigned int) const | |
629 | { gold_unreachable(); } | |
630 | ||
631 | virtual int64_t | |
632 | do_tls_offset_for_global(Symbol*, unsigned int) const | |
633 | { gold_unreachable(); } | |
634 | ||
dc3714f3 AM |
635 | virtual void |
636 | do_function_location(Symbol_location*) const = 0; | |
637 | ||
b3ce541e ILT |
638 | // Virtual function which may be overriden by the child class. |
639 | virtual bool | |
640 | do_can_check_for_function_pointers() const | |
641 | { return false; } | |
642 | ||
643 | // Virtual function which may be overridden by the child class. We | |
644 | // recognize some default sections for which we don't care whether | |
645 | // they have function pointers. | |
646 | virtual bool | |
647 | do_section_may_have_icf_unsafe_pointers(const char* section_name) const | |
648 | { | |
649 | // We recognize sections for normal vtables, construction vtables and | |
650 | // EH frames. | |
651 | return (!is_prefix_of(".rodata._ZTV", section_name) | |
652 | && !is_prefix_of(".data.rel.ro._ZTV", section_name) | |
653 | && !is_prefix_of(".rodata._ZTC", section_name) | |
654 | && !is_prefix_of(".data.rel.ro._ZTC", section_name) | |
655 | && !is_prefix_of(".eh_frame", section_name)); | |
656 | } | |
657 | ||
02d7cd44 ILT |
658 | virtual uint64_t |
659 | do_ehframe_datarel_base() const | |
660 | { gold_unreachable(); } | |
661 | ||
b6848d3c ILT |
662 | // Virtual function which may be overridden by the child class. The |
663 | // default implementation is that any function not defined by the | |
664 | // ABI is a call to a non-split function. | |
665 | virtual bool | |
bd8d853f MK |
666 | do_is_call_to_non_split(const Symbol* sym, const unsigned char*, |
667 | const unsigned char*, section_size_type) const; | |
b6848d3c | 668 | |
364c7fa5 ILT |
669 | // Virtual function which may be overridden by the child class. |
670 | virtual void | |
671 | do_calls_non_split(Relobj* object, unsigned int, section_offset_type, | |
6e0813d3 CC |
672 | section_size_type, const unsigned char*, size_t, |
673 | unsigned char*, section_size_type, | |
364c7fa5 ILT |
674 | std::string*, std::string*) const; |
675 | ||
f733487b | 676 | // make_elf_object hooks. There are four versions of these for |
7296d933 | 677 | // different address sizes and endianness. |
364c7fa5 | 678 | |
d5b40221 DK |
679 | // Set processor specific flags. |
680 | void | |
681 | set_processor_specific_flags(elfcpp::Elf_Word flags) | |
682 | { | |
683 | this->processor_specific_flags_ = flags; | |
684 | this->are_processor_specific_flags_set_ = true; | |
685 | } | |
2e702c99 | 686 | |
f733487b | 687 | #ifdef HAVE_TARGET_32_LITTLE |
9b547ce6 | 688 | // Virtual functions which may be overridden by the child class. |
f733487b DK |
689 | virtual Object* |
690 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
691 | const elfcpp::Ehdr<32, false>&); | |
692 | #endif | |
693 | ||
694 | #ifdef HAVE_TARGET_32_BIG | |
9b547ce6 | 695 | // Virtual functions which may be overridden by the child class. |
f733487b DK |
696 | virtual Object* |
697 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
698 | const elfcpp::Ehdr<32, true>&); | |
699 | #endif | |
700 | ||
701 | #ifdef HAVE_TARGET_64_LITTLE | |
9b547ce6 | 702 | // Virtual functions which may be overridden by the child class. |
f733487b DK |
703 | virtual Object* |
704 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
705 | const elfcpp::Ehdr<64, false>& ehdr); | |
706 | #endif | |
707 | ||
708 | #ifdef HAVE_TARGET_64_BIG | |
9b547ce6 | 709 | // Virtual functions which may be overridden by the child class. |
f733487b DK |
710 | virtual Object* |
711 | do_make_elf_object(const std::string& name, Input_file* input_file, | |
712 | off_t offset, const elfcpp::Ehdr<64, true>& ehdr); | |
713 | #endif | |
714 | ||
9b547ce6 | 715 | // Virtual functions which may be overridden by the child class. |
c0a62865 DK |
716 | virtual Output_section* |
717 | do_make_output_section(const char* name, elfcpp::Elf_Word type, | |
718 | elfcpp::Elf_Xword flags); | |
719 | ||
9b547ce6 | 720 | // Virtual function which may be overridden by the child class. |
20e6d0d6 DK |
721 | virtual bool |
722 | do_may_relax() const | |
723 | { return parameters->options().relax(); } | |
724 | ||
9b547ce6 | 725 | // Virtual function which may be overridden by the child class. |
20e6d0d6 | 726 | virtual bool |
f625ae50 | 727 | do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*) |
20e6d0d6 DK |
728 | { return false; } |
729 | ||
364c7fa5 ILT |
730 | // A function for targets to call. Return whether BYTES/LEN matches |
731 | // VIEW/VIEW_SIZE at OFFSET. | |
732 | bool | |
733 | match_view(const unsigned char* view, section_size_type view_size, | |
734 | section_offset_type offset, const char* bytes, size_t len) const; | |
735 | ||
736 | // Set the contents of a VIEW/VIEW_SIZE to nops starting at OFFSET | |
737 | // for LEN bytes. | |
738 | void | |
739 | set_view_to_nop(unsigned char* view, section_size_type view_size, | |
740 | section_offset_type offset, size_t len) const; | |
741 | ||
9b547ce6 | 742 | // This must be overridden by the child class if it has target-specific |
2e702c99 | 743 | // attributes subsection in the attribute section. |
05a352e6 DK |
744 | virtual int |
745 | do_attribute_arg_type(int) const | |
746 | { gold_unreachable(); } | |
747 | ||
748 | // This may be overridden by the child class. | |
749 | virtual int | |
750 | do_attributes_order(int num) const | |
751 | { return num; } | |
752 | ||
0d31c79d DK |
753 | // This may be overridden by the child class. |
754 | virtual void | |
755 | do_select_as_default_target() | |
756 | { } | |
757 | ||
647f1574 DK |
758 | // This may be overridden by the child class. |
759 | virtual void | |
760 | do_define_standard_symbols(Symbol_table*, Layout*) | |
761 | { } | |
762 | ||
921b5322 AM |
763 | // This may be overridden by the child class. |
764 | virtual const char* | |
765 | do_output_section_name(const Relobj*, const char*, size_t*) const | |
766 | { return NULL; } | |
767 | ||
e81fea4d AM |
768 | // This may be overridden by the child class. |
769 | virtual void | |
770 | do_gc_mark_symbol(Symbol_table*, Symbol*) const | |
771 | { } | |
772 | ||
98ff9231 CC |
773 | // This may be overridden by the child class. |
774 | virtual bool | |
775 | do_has_custom_set_dynsym_indexes() const | |
776 | { return false; } | |
777 | ||
778 | // This may be overridden by the child class. | |
779 | virtual unsigned int | |
780 | do_set_dynsym_indexes(std::vector<Symbol*>*, unsigned int, | |
781 | std::vector<Symbol*>*, Stringpool*, Versions*, | |
782 | Symbol_table*) const | |
783 | { gold_unreachable(); } | |
784 | ||
918fc1f8 CC |
785 | // This may be overridden by the child class. |
786 | virtual unsigned int | |
787 | do_dynamic_tag_custom_value(elfcpp::DT) const | |
788 | { gold_unreachable(); } | |
789 | ||
800d9823 CC |
790 | // This may be overridden by the child class. |
791 | virtual void | |
792 | do_adjust_dyn_symbol(const Symbol*, unsigned char*) const | |
793 | { } | |
794 | ||
99fd8cff CC |
795 | // This may be overridden by the child class. |
796 | virtual bool | |
797 | do_should_include_section(elfcpp::Elf_Word) const | |
798 | { return true; } | |
799 | ||
14bfc3f5 | 800 | private: |
f733487b | 801 | // The implementations of the four do_make_elf_object virtual functions are |
7296d933 | 802 | // almost identical except for their sizes and endianness. We use a template. |
f733487b DK |
803 | // for their implementations. |
804 | template<int size, bool big_endian> | |
805 | inline Object* | |
806 | do_make_elf_object_implementation(const std::string&, Input_file*, off_t, | |
807 | const elfcpp::Ehdr<size, big_endian>&); | |
808 | ||
14bfc3f5 ILT |
809 | Target(const Target&); |
810 | Target& operator=(const Target&); | |
811 | ||
75f65a3e ILT |
812 | // The target information. |
813 | const Target_info* pti_; | |
d5b40221 DK |
814 | // Processor-specific flags. |
815 | elfcpp::Elf_Word processor_specific_flags_; | |
816 | // Whether the processor-specific flags are set at least once. | |
817 | bool are_processor_specific_flags_set_; | |
200b2bb9 ILT |
818 | // If not ELFOSABI_NONE, the value to put in the EI_OSABI field of |
819 | // the ELF header. This is handled at this level because it is | |
820 | // OS-specific rather than processor-specific. | |
821 | elfcpp::ELFOSABI osabi_; | |
bae7f79e ILT |
822 | }; |
823 | ||
14bfc3f5 ILT |
824 | // The abstract class for a specific size and endianness of target. |
825 | // Each actual target implementation class should derive from an | |
826 | // instantiation of Sized_target. | |
827 | ||
828 | template<int size, bool big_endian> | |
829 | class Sized_target : public Target | |
830 | { | |
831 | public: | |
832 | // Make a new symbol table entry for the target. This should be | |
833 | // overridden by a target which needs additional information in the | |
834 | // symbol table. This will only be called if has_make_symbol() | |
835 | // returns true. | |
836 | virtual Sized_symbol<size>* | |
dc1c8a16 | 837 | make_symbol(const char*, elfcpp::STT, Object*, unsigned int, uint64_t) |
a3ad94ed | 838 | { gold_unreachable(); } |
14bfc3f5 ILT |
839 | |
840 | // Resolve a symbol for the target. This should be overridden by a | |
841 | // target which needs to take special action. TO is the | |
842 | // pre-existing symbol. SYM is the new symbol, seen in OBJECT. | |
14b31740 ILT |
843 | // VERSION is the version of SYM. This will only be called if |
844 | // has_resolve() returns true. | |
14bfc3f5 | 845 | virtual void |
14b31740 ILT |
846 | resolve(Symbol*, const elfcpp::Sym<size, big_endian>&, Object*, |
847 | const char*) | |
a3ad94ed | 848 | { gold_unreachable(); } |
14bfc3f5 | 849 | |
6d03d481 ST |
850 | // Process the relocs for a section, and record information of the |
851 | // mapping from source to destination sections. This mapping is later | |
852 | // used to determine unreferenced garbage sections. This procedure is | |
853 | // only called during garbage collection. | |
854 | virtual void | |
ad0f2072 ILT |
855 | gc_process_relocs(Symbol_table* symtab, |
856 | Layout* layout, | |
6fa2a40b | 857 | Sized_relobj_file<size, big_endian>* object, |
ad0f2072 ILT |
858 | unsigned int data_shndx, |
859 | unsigned int sh_type, | |
860 | const unsigned char* prelocs, | |
861 | size_t reloc_count, | |
862 | Output_section* output_section, | |
863 | bool needs_special_offset_handling, | |
864 | size_t local_symbol_count, | |
865 | const unsigned char* plocal_symbols) = 0; | |
6d03d481 | 866 | |
92e059d8 | 867 | // Scan the relocs for a section, and record any information |
ad0f2072 ILT |
868 | // required for the symbol. SYMTAB is the symbol table. OBJECT is |
869 | // the object in which the section appears. DATA_SHNDX is the | |
870 | // section index that these relocs apply to. SH_TYPE is the type of | |
871 | // the relocation section, SHT_REL or SHT_RELA. PRELOCS points to | |
872 | // the relocation data. RELOC_COUNT is the number of relocs. | |
873 | // LOCAL_SYMBOL_COUNT is the number of local symbols. | |
874 | // OUTPUT_SECTION is the output section. | |
730cdc88 ILT |
875 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if offsets to the output |
876 | // sections are not mapped as usual. PLOCAL_SYMBOLS points to the | |
877 | // local symbol data from OBJECT. GLOBAL_SYMBOLS is the array of | |
878 | // pointers to the global symbol table from OBJECT. | |
61ba1cf9 | 879 | virtual void |
ad0f2072 | 880 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 881 | Layout* layout, |
6fa2a40b | 882 | Sized_relobj_file<size, big_endian>* object, |
a3ad94ed | 883 | unsigned int data_shndx, |
92e059d8 ILT |
884 | unsigned int sh_type, |
885 | const unsigned char* prelocs, | |
886 | size_t reloc_count, | |
730cdc88 ILT |
887 | Output_section* output_section, |
888 | bool needs_special_offset_handling, | |
92e059d8 | 889 | size_t local_symbol_count, |
730cdc88 | 890 | const unsigned char* plocal_symbols) = 0; |
92e059d8 ILT |
891 | |
892 | // Relocate section data. SH_TYPE is the type of the relocation | |
893 | // section, SHT_REL or SHT_RELA. PRELOCS points to the relocation | |
730cdc88 ILT |
894 | // information. RELOC_COUNT is the number of relocs. |
895 | // OUTPUT_SECTION is the output section. | |
896 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if offsets must be mapped | |
897 | // to correspond to the output section. VIEW is a view into the | |
898 | // output file holding the section contents, VIEW_ADDRESS is the | |
899 | // virtual address of the view, and VIEW_SIZE is the size of the | |
900 | // view. If NEEDS_SPECIAL_OFFSET_HANDLING is true, the VIEW_xx | |
901 | // parameters refer to the complete output section data, not just | |
902 | // the input section data. | |
92e059d8 ILT |
903 | virtual void |
904 | relocate_section(const Relocate_info<size, big_endian>*, | |
905 | unsigned int sh_type, | |
906 | const unsigned char* prelocs, | |
907 | size_t reloc_count, | |
730cdc88 ILT |
908 | Output_section* output_section, |
909 | bool needs_special_offset_handling, | |
92e059d8 ILT |
910 | unsigned char* view, |
911 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
364c7fa5 ILT |
912 | section_size_type view_size, |
913 | const Reloc_symbol_changes*) = 0; | |
61ba1cf9 | 914 | |
6a74a719 ILT |
915 | // Scan the relocs during a relocatable link. The parameters are |
916 | // like scan_relocs, with an additional Relocatable_relocs | |
917 | // parameter, used to record the disposition of the relocs. | |
918 | virtual void | |
ad0f2072 | 919 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 920 | Layout* layout, |
6fa2a40b | 921 | Sized_relobj_file<size, big_endian>* object, |
6a74a719 ILT |
922 | unsigned int data_shndx, |
923 | unsigned int sh_type, | |
924 | const unsigned char* prelocs, | |
925 | size_t reloc_count, | |
926 | Output_section* output_section, | |
927 | bool needs_special_offset_handling, | |
928 | size_t local_symbol_count, | |
929 | const unsigned char* plocal_symbols, | |
930 | Relocatable_relocs*) = 0; | |
931 | ||
4d625b70 CC |
932 | // Scan the relocs for --emit-relocs. The parameters are |
933 | // like scan_relocatable_relocs. | |
934 | virtual void | |
935 | emit_relocs_scan(Symbol_table* symtab, | |
936 | Layout* layout, | |
937 | Sized_relobj_file<size, big_endian>* object, | |
938 | unsigned int data_shndx, | |
939 | unsigned int sh_type, | |
940 | const unsigned char* prelocs, | |
941 | size_t reloc_count, | |
942 | Output_section* output_section, | |
943 | bool needs_special_offset_handling, | |
944 | size_t local_symbol_count, | |
945 | const unsigned char* plocal_syms, | |
946 | Relocatable_relocs* rr) = 0; | |
947 | ||
7404fe1b AM |
948 | // Emit relocations for a section during a relocatable link, and for |
949 | // --emit-relocs. The parameters are like relocate_section, with | |
950 | // additional parameters for the view of the output reloc section. | |
6a74a719 | 951 | virtual void |
7404fe1b AM |
952 | relocate_relocs(const Relocate_info<size, big_endian>*, |
953 | unsigned int sh_type, | |
954 | const unsigned char* prelocs, | |
955 | size_t reloc_count, | |
956 | Output_section* output_section, | |
62fe925a RM |
957 | typename elfcpp::Elf_types<size>::Elf_Off |
958 | offset_in_output_section, | |
7404fe1b AM |
959 | unsigned char* view, |
960 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
961 | section_size_type view_size, | |
962 | unsigned char* reloc_view, | |
963 | section_size_type reloc_view_size) = 0; | |
2e702c99 | 964 | |
5c388529 DK |
965 | // Perform target-specific processing in a relocatable link. This is |
966 | // only used if we use the relocation strategy RELOC_SPECIAL. | |
967 | // RELINFO points to a Relocation_info structure. SH_TYPE is the relocation | |
968 | // section type. PRELOC_IN points to the original relocation. RELNUM is | |
969 | // the index number of the relocation in the relocation section. | |
970 | // OUTPUT_SECTION is the output section to which the relocation is applied. | |
971 | // OFFSET_IN_OUTPUT_SECTION is the offset of the relocation input section | |
972 | // within the output section. VIEW points to the output view of the | |
973 | // output section. VIEW_ADDRESS is output address of the view. VIEW_SIZE | |
974 | // is the size of the output view and PRELOC_OUT points to the new | |
975 | // relocation in the output object. | |
976 | // | |
977 | // A target only needs to override this if the generic code in | |
978 | // target-reloc.h cannot handle some relocation types. | |
6a74a719 | 979 | |
5c388529 DK |
980 | virtual void |
981 | relocate_special_relocatable(const Relocate_info<size, big_endian>* | |
982 | /*relinfo */, | |
983 | unsigned int /* sh_type */, | |
984 | const unsigned char* /* preloc_in */, | |
985 | size_t /* relnum */, | |
986 | Output_section* /* output_section */, | |
62fe925a RM |
987 | typename elfcpp::Elf_types<size>::Elf_Off |
988 | /* offset_in_output_section */, | |
5c388529 DK |
989 | unsigned char* /* view */, |
990 | typename elfcpp::Elf_types<size>::Elf_Addr | |
991 | /* view_address */, | |
992 | section_size_type /* view_size */, | |
993 | unsigned char* /* preloc_out*/) | |
994 | { gold_unreachable(); } | |
2e702c99 | 995 | |
0e70b911 CC |
996 | // Return the number of entries in the GOT. This is only used for |
997 | // laying out the incremental link info sections. A target needs | |
998 | // to implement this to support incremental linking. | |
999 | ||
1000 | virtual unsigned int | |
1001 | got_entry_count() const | |
1002 | { gold_unreachable(); } | |
1003 | ||
1004 | // Return the number of entries in the PLT. This is only used for | |
1005 | // laying out the incremental link info sections. A target needs | |
1006 | // to implement this to support incremental linking. | |
1007 | ||
1008 | virtual unsigned int | |
1009 | plt_entry_count() const | |
1010 | { gold_unreachable(); } | |
1011 | ||
1012 | // Return the offset of the first non-reserved PLT entry. This is | |
1013 | // only used for laying out the incremental link info sections. | |
1014 | // A target needs to implement this to support incremental linking. | |
1015 | ||
1016 | virtual unsigned int | |
1017 | first_plt_entry_offset() const | |
1018 | { gold_unreachable(); } | |
1019 | ||
1020 | // Return the size of each PLT entry. This is only used for | |
1021 | // laying out the incremental link info sections. A target needs | |
1022 | // to implement this to support incremental linking. | |
1023 | ||
1024 | virtual unsigned int | |
1025 | plt_entry_size() const | |
1026 | { gold_unreachable(); } | |
1027 | ||
41e83f2b L |
1028 | // Return the size of each GOT entry. This is only used for |
1029 | // laying out the incremental link info sections. A target needs | |
1030 | // to implement this if its GOT size is different. | |
1031 | ||
1032 | virtual unsigned int | |
1033 | got_entry_size() const | |
1034 | { return size / 8; } | |
1035 | ||
4829d394 CC |
1036 | // Create the GOT and PLT sections for an incremental update. |
1037 | // A target needs to implement this to support incremental linking. | |
1038 | ||
dd74ae06 | 1039 | virtual Output_data_got_base* |
4829d394 CC |
1040 | init_got_plt_for_update(Symbol_table*, |
1041 | Layout*, | |
1042 | unsigned int /* got_count */, | |
1043 | unsigned int /* plt_count */) | |
1044 | { gold_unreachable(); } | |
1045 | ||
6fa2a40b CC |
1046 | // Reserve a GOT entry for a local symbol, and regenerate any |
1047 | // necessary dynamic relocations. | |
1048 | virtual void | |
1049 | reserve_local_got_entry(unsigned int /* got_index */, | |
1050 | Sized_relobj<size, big_endian>* /* obj */, | |
1051 | unsigned int /* r_sym */, | |
1052 | unsigned int /* got_type */) | |
1053 | { gold_unreachable(); } | |
1054 | ||
1055 | // Reserve a GOT entry for a global symbol, and regenerate any | |
1056 | // necessary dynamic relocations. | |
1057 | virtual void | |
1058 | reserve_global_got_entry(unsigned int /* got_index */, Symbol* /* gsym */, | |
1059 | unsigned int /* got_type */) | |
1060 | { gold_unreachable(); } | |
1061 | ||
4829d394 CC |
1062 | // Register an existing PLT entry for a global symbol. |
1063 | // A target needs to implement this to support incremental linking. | |
1064 | ||
1065 | virtual void | |
67181c72 ILT |
1066 | register_global_plt_entry(Symbol_table*, Layout*, |
1067 | unsigned int /* plt_index */, | |
4829d394 CC |
1068 | Symbol*) |
1069 | { gold_unreachable(); } | |
1070 | ||
26d3c67d CC |
1071 | // Force a COPY relocation for a given symbol. |
1072 | // A target needs to implement this to support incremental linking. | |
1073 | ||
1074 | virtual void | |
1075 | emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t) | |
1076 | { gold_unreachable(); } | |
1077 | ||
94a3fc8b CC |
1078 | // Apply an incremental relocation. |
1079 | ||
1080 | virtual void | |
1081 | apply_relocation(const Relocate_info<size, big_endian>* /* relinfo */, | |
1082 | typename elfcpp::Elf_types<size>::Elf_Addr /* r_offset */, | |
1083 | unsigned int /* r_type */, | |
1084 | typename elfcpp::Elf_types<size>::Elf_Swxword /* r_addend */, | |
1085 | const Symbol* /* gsym */, | |
1086 | unsigned char* /* view */, | |
1087 | typename elfcpp::Elf_types<size>::Elf_Addr /* address */, | |
1088 | section_size_type /* view_size */) | |
1089 | { gold_unreachable(); } | |
1090 | ||
e81fea4d AM |
1091 | // Handle target specific gc actions when adding a gc reference from |
1092 | // SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX | |
1093 | // and DST_OFF. | |
1094 | void | |
1095 | gc_add_reference(Symbol_table* symtab, | |
efc6fa12 | 1096 | Relobj* src_obj, |
e81fea4d | 1097 | unsigned int src_shndx, |
efc6fa12 | 1098 | Relobj* dst_obj, |
e81fea4d AM |
1099 | unsigned int dst_shndx, |
1100 | typename elfcpp::Elf_types<size>::Elf_Addr dst_off) const | |
1101 | { | |
1102 | this->do_gc_add_reference(symtab, src_obj, src_shndx, | |
1103 | dst_obj, dst_shndx, dst_off); | |
1104 | } | |
1105 | ||
4d625b70 CC |
1106 | // Return the r_sym field from a relocation. |
1107 | // Most targets can use the default version of this routine, | |
1108 | // but some targets have a non-standard r_info field, and will | |
1109 | // need to provide a target-specific version. | |
1110 | virtual unsigned int | |
1111 | get_r_sym(const unsigned char* preloc) const | |
1112 | { | |
1113 | // Since REL and RELA relocs share the same structure through | |
1114 | // the r_info field, we can just use REL here. | |
1115 | elfcpp::Rel<size, big_endian> rel(preloc); | |
1116 | return elfcpp::elf_r_sym<size>(rel.get_r_info()); | |
1117 | } | |
1118 | ||
14bfc3f5 | 1119 | protected: |
75f65a3e ILT |
1120 | Sized_target(const Target::Target_info* pti) |
1121 | : Target(pti) | |
1122 | { | |
a3ad94ed ILT |
1123 | gold_assert(pti->size == size); |
1124 | gold_assert(pti->is_big_endian ? big_endian : !big_endian); | |
75f65a3e | 1125 | } |
200b2bb9 ILT |
1126 | |
1127 | // Set the EI_OSABI field if requested. | |
1128 | virtual void | |
cc84c10b | 1129 | do_adjust_elf_header(unsigned char*, int); |
e81fea4d AM |
1130 | |
1131 | // Handle target specific gc actions when adding a gc reference. | |
1132 | virtual void | |
efc6fa12 CC |
1133 | do_gc_add_reference(Symbol_table*, Relobj*, unsigned int, |
1134 | Relobj*, unsigned int, | |
e81fea4d AM |
1135 | typename elfcpp::Elf_types<size>::Elf_Addr) const |
1136 | { } | |
dc3714f3 AM |
1137 | |
1138 | virtual void | |
1139 | do_function_location(Symbol_location*) const | |
1140 | { } | |
14bfc3f5 | 1141 | }; |
bae7f79e ILT |
1142 | |
1143 | } // End namespace gold. | |
1144 | ||
1145 | #endif // !defined(GOLD_TARGET_H) |