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14bfc3f5 | 1 | // target.h -- target support for gold -*- C++ -*- |
bae7f79e | 2 | |
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 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" |
20e6d0d6 | 39 | #include "debug.h" |
14bfc3f5 | 40 | |
bae7f79e ILT |
41 | namespace gold |
42 | { | |
43 | ||
14bfc3f5 | 44 | class Object; |
364c7fa5 | 45 | class Relobj; |
61ba1cf9 | 46 | template<int size, bool big_endian> |
f6ce93d6 | 47 | class Sized_relobj; |
6a74a719 | 48 | class Relocatable_relocs; |
92e059d8 | 49 | template<int size, bool big_endian> |
730cdc88 | 50 | class Relocate_info; |
364c7fa5 | 51 | class Reloc_symbol_changes; |
f6ce93d6 ILT |
52 | class Symbol; |
53 | template<int size> | |
54 | class Sized_symbol; | |
55 | class Symbol_table; | |
730cdc88 | 56 | class Output_section; |
d5b40221 | 57 | class Input_objects; |
14bfc3f5 ILT |
58 | |
59 | // The abstract class for target specific handling. | |
60 | ||
bae7f79e ILT |
61 | class Target |
62 | { | |
63 | public: | |
14bfc3f5 ILT |
64 | virtual ~Target() |
65 | { } | |
66 | ||
67 | // Return the bit size that this target implements. This should | |
68 | // return 32 or 64. | |
69 | int | |
70 | get_size() const | |
75f65a3e | 71 | { return this->pti_->size; } |
14bfc3f5 ILT |
72 | |
73 | // Return whether this target is big-endian. | |
74 | bool | |
75 | is_big_endian() const | |
75f65a3e | 76 | { return this->pti_->is_big_endian; } |
14bfc3f5 | 77 | |
61ba1cf9 ILT |
78 | // Machine code to store in e_machine field of ELF header. |
79 | elfcpp::EM | |
80 | machine_code() const | |
81 | { return this->pti_->machine_code; } | |
82 | ||
d5b40221 DK |
83 | // Processor specific flags to store in e_flags field of ELF header. |
84 | elfcpp::Elf_Word | |
85 | processor_specific_flags() const | |
86 | { return this->processor_specific_flags_; } | |
87 | ||
88 | // Whether processor specific flags are set at least once. | |
89 | bool | |
90 | are_processor_specific_flags_set() const | |
91 | { return this->are_processor_specific_flags_set_; } | |
92 | ||
14bfc3f5 ILT |
93 | // Whether this target has a specific make_symbol function. |
94 | bool | |
95 | has_make_symbol() const | |
75f65a3e | 96 | { return this->pti_->has_make_symbol; } |
14bfc3f5 ILT |
97 | |
98 | // Whether this target has a specific resolve function. | |
99 | bool | |
100 | has_resolve() const | |
75f65a3e ILT |
101 | { return this->pti_->has_resolve; } |
102 | ||
c51e6221 ILT |
103 | // Whether this target has a specific code fill function. |
104 | bool | |
105 | has_code_fill() const | |
106 | { return this->pti_->has_code_fill; } | |
107 | ||
dbe717ef ILT |
108 | // Return the default name of the dynamic linker. |
109 | const char* | |
110 | dynamic_linker() const | |
111 | { return this->pti_->dynamic_linker; } | |
112 | ||
75f65a3e ILT |
113 | // Return the default address to use for the text segment. |
114 | uint64_t | |
0c5e9c22 ILT |
115 | default_text_segment_address() const |
116 | { return this->pti_->default_text_segment_address; } | |
75f65a3e ILT |
117 | |
118 | // Return the ABI specified page size. | |
119 | uint64_t | |
120 | abi_pagesize() const | |
cd72c291 | 121 | { |
8851ecca ILT |
122 | if (parameters->options().max_page_size() > 0) |
123 | return parameters->options().max_page_size(); | |
cd72c291 ILT |
124 | else |
125 | return this->pti_->abi_pagesize; | |
126 | } | |
75f65a3e ILT |
127 | |
128 | // Return the common page size used on actual systems. | |
129 | uint64_t | |
130 | common_pagesize() const | |
cd72c291 | 131 | { |
8851ecca ILT |
132 | if (parameters->options().common_page_size() > 0) |
133 | return std::min(parameters->options().common_page_size(), | |
cd72c291 ILT |
134 | this->abi_pagesize()); |
135 | else | |
136 | return std::min(this->pti_->common_pagesize, | |
137 | this->abi_pagesize()); | |
138 | } | |
14bfc3f5 | 139 | |
35cdfc9a ILT |
140 | // If we see some object files with .note.GNU-stack sections, and |
141 | // some objects files without them, this returns whether we should | |
142 | // consider the object files without them to imply that the stack | |
143 | // should be executable. | |
144 | bool | |
145 | is_default_stack_executable() const | |
146 | { return this->pti_->is_default_stack_executable; } | |
147 | ||
0864d551 ILT |
148 | // Return a character which may appear as a prefix for a wrap |
149 | // symbol. If this character appears, we strip it when checking for | |
150 | // wrapping and add it back when forming the final symbol name. | |
151 | // This should be '\0' if not special prefix is required, which is | |
152 | // the normal case. | |
153 | char | |
154 | wrap_char() const | |
155 | { return this->pti_->wrap_char; } | |
156 | ||
8a5e3e08 ILT |
157 | // Return the special section index which indicates a small common |
158 | // symbol. This will return SHN_UNDEF if there are no small common | |
159 | // symbols. | |
160 | elfcpp::Elf_Half | |
161 | small_common_shndx() const | |
162 | { return this->pti_->small_common_shndx; } | |
163 | ||
164 | // Return values to add to the section flags for the section holding | |
165 | // small common symbols. | |
166 | elfcpp::Elf_Xword | |
167 | small_common_section_flags() const | |
168 | { | |
169 | gold_assert(this->pti_->small_common_shndx != elfcpp::SHN_UNDEF); | |
170 | return this->pti_->small_common_section_flags; | |
171 | } | |
172 | ||
173 | // Return the special section index which indicates a large common | |
174 | // symbol. This will return SHN_UNDEF if there are no large common | |
175 | // symbols. | |
176 | elfcpp::Elf_Half | |
177 | large_common_shndx() const | |
178 | { return this->pti_->large_common_shndx; } | |
179 | ||
180 | // Return values to add to the section flags for the section holding | |
181 | // large common symbols. | |
182 | elfcpp::Elf_Xword | |
183 | large_common_section_flags() const | |
184 | { | |
185 | gold_assert(this->pti_->large_common_shndx != elfcpp::SHN_UNDEF); | |
186 | return this->pti_->large_common_section_flags; | |
187 | } | |
188 | ||
189 | // This hook is called when an output section is created. | |
190 | void | |
191 | new_output_section(Output_section* os) const | |
192 | { this->do_new_output_section(os); } | |
193 | ||
5a6f7e2d ILT |
194 | // This is called to tell the target to complete any sections it is |
195 | // handling. After this all sections must have their final size. | |
196 | void | |
f59f41f3 DK |
197 | finalize_sections(Layout* layout, const Input_objects* input_objects, |
198 | Symbol_table* symtab) | |
199 | { return this->do_finalize_sections(layout, input_objects, symtab); } | |
5a6f7e2d | 200 | |
ab5c9e90 ILT |
201 | // Return the value to use for a global symbol which needs a special |
202 | // value in the dynamic symbol table. This will only be called if | |
203 | // the backend first calls symbol->set_needs_dynsym_value(). | |
204 | uint64_t | |
205 | dynsym_value(const Symbol* sym) const | |
206 | { return this->do_dynsym_value(sym); } | |
207 | ||
c51e6221 ILT |
208 | // Return a string to use to fill out a code section. This is |
209 | // basically one or more NOPS which must fill out the specified | |
210 | // length in bytes. | |
211 | std::string | |
8851ecca | 212 | code_fill(section_size_type length) const |
c51e6221 ILT |
213 | { return this->do_code_fill(length); } |
214 | ||
9a2d6984 ILT |
215 | // Return whether SYM is known to be defined by the ABI. This is |
216 | // used to avoid inappropriate warnings about undefined symbols. | |
217 | bool | |
9c2d0ef9 | 218 | is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
219 | { return this->do_is_defined_by_abi(sym); } |
220 | ||
36959681 ILT |
221 | // Adjust the output file header before it is written out. VIEW |
222 | // points to the header in external form. LEN is the length. | |
223 | void | |
224 | adjust_elf_header(unsigned char* view, int len) const | |
225 | { return this->do_adjust_elf_header(view, len); } | |
226 | ||
bb04269c DK |
227 | // Return whether NAME is a local label name. This is used to implement the |
228 | // --discard-locals options. | |
229 | bool | |
230 | is_local_label_name(const char* name) const | |
231 | { return this->do_is_local_label_name(name); } | |
232 | ||
e291e7b9 ILT |
233 | // Get the symbol index to use for a target specific reloc. |
234 | unsigned int | |
235 | reloc_symbol_index(void* arg, unsigned int type) const | |
236 | { return this->do_reloc_symbol_index(arg, type); } | |
237 | ||
238 | // Get the addend to use for a target specific reloc. | |
239 | uint64_t | |
240 | reloc_addend(void* arg, unsigned int type, uint64_t addend) const | |
241 | { return this->do_reloc_addend(arg, type, addend); } | |
242 | ||
364c7fa5 ILT |
243 | // A function starts at OFFSET in section SHNDX in OBJECT. That |
244 | // function was compiled with -fsplit-stack, but it refers to a | |
245 | // function which was compiled without -fsplit-stack. VIEW is a | |
246 | // modifiable view of the section; VIEW_SIZE is the size of the | |
247 | // view. The target has to adjust the function so that it allocates | |
248 | // enough stack. | |
249 | void | |
250 | calls_non_split(Relobj* object, unsigned int shndx, | |
251 | section_offset_type fnoffset, section_size_type fnsize, | |
252 | unsigned char* view, section_size_type view_size, | |
253 | std::string* from, std::string* to) const | |
254 | { | |
255 | this->do_calls_non_split(object, shndx, fnoffset, fnsize, view, view_size, | |
256 | from, to); | |
257 | } | |
258 | ||
f733487b DK |
259 | // Make an ELF object. |
260 | template<int size, bool big_endian> | |
261 | Object* | |
262 | make_elf_object(const std::string& name, Input_file* input_file, | |
263 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
264 | { return this->do_make_elf_object(name, input_file, offset, ehdr); } | |
265 | ||
c0a62865 DK |
266 | // Make an output section. |
267 | Output_section* | |
268 | make_output_section(const char* name, elfcpp::Elf_Word type, | |
269 | elfcpp::Elf_Xword flags) | |
270 | { return this->do_make_output_section(name, type, flags); } | |
271 | ||
20e6d0d6 DK |
272 | // Return true if target wants to perform relaxation. |
273 | bool | |
274 | may_relax() const | |
275 | { | |
276 | // Run the dummy relaxation pass twice if relaxation debugging is enabled. | |
277 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
278 | return true; | |
279 | ||
280 | return this->do_may_relax(); | |
281 | } | |
282 | ||
283 | // Perform a relaxation pass. Return true if layout may be changed. | |
284 | bool | |
c0a62865 DK |
285 | relax(int pass, const Input_objects* input_objects, Symbol_table* symtab, |
286 | Layout* layout) | |
20e6d0d6 DK |
287 | { |
288 | // Run the dummy relaxation pass twice if relaxation debugging is enabled. | |
289 | if (is_debugging_enabled(DEBUG_RELAXATION)) | |
290 | return pass < 2; | |
291 | ||
c0a62865 DK |
292 | return this->do_relax(pass, input_objects, symtab, layout); |
293 | } | |
20e6d0d6 | 294 | |
05a352e6 DK |
295 | // Return the target-specific name of attributes section. This is |
296 | // NULL if a target does not use attributes section or if it uses | |
297 | // the default section name ".gnu.attributes". | |
298 | const char* | |
299 | attributes_section() const | |
300 | { return this->pti_->attributes_section; } | |
301 | ||
302 | // Return the vendor name of vendor attributes. | |
303 | const char* | |
304 | attributes_vendor() const | |
305 | { return this->pti_->attributes_vendor; } | |
306 | ||
307 | // Whether a section called NAME is an attribute section. | |
308 | bool | |
309 | is_attributes_section(const char* name) const | |
310 | { | |
311 | return ((this->pti_->attributes_section != NULL | |
312 | && strcmp(name, this->pti_->attributes_section) == 0) | |
313 | || strcmp(name, ".gnu.attributes") == 0); | |
314 | } | |
315 | ||
316 | // Return a bit mask of argument types for attribute with TAG. | |
317 | int | |
318 | attribute_arg_type(int tag) const | |
319 | { return this->do_attribute_arg_type(tag); } | |
320 | ||
321 | // Return the attribute tag of the position NUM in the list of fixed | |
322 | // attributes. Normally there is no reordering and | |
323 | // attributes_order(NUM) == NUM. | |
324 | int | |
325 | attributes_order(int num) const | |
326 | { return this->do_attributes_order(num); } | |
327 | ||
14bfc3f5 | 328 | protected: |
75f65a3e ILT |
329 | // This struct holds the constant information for a child class. We |
330 | // use a struct to avoid the overhead of virtual function calls for | |
331 | // simple information. | |
332 | struct Target_info | |
333 | { | |
334 | // Address size (32 or 64). | |
335 | int size; | |
336 | // Whether the target is big endian. | |
337 | bool is_big_endian; | |
61ba1cf9 ILT |
338 | // The code to store in the e_machine field of the ELF header. |
339 | elfcpp::EM machine_code; | |
75f65a3e ILT |
340 | // Whether this target has a specific make_symbol function. |
341 | bool has_make_symbol; | |
342 | // Whether this target has a specific resolve function. | |
343 | bool has_resolve; | |
c51e6221 ILT |
344 | // Whether this target has a specific code fill function. |
345 | bool has_code_fill; | |
35cdfc9a ILT |
346 | // Whether an object file with no .note.GNU-stack sections implies |
347 | // that the stack should be executable. | |
348 | bool is_default_stack_executable; | |
0864d551 ILT |
349 | // Prefix character to strip when checking for wrapping. |
350 | char wrap_char; | |
dbe717ef ILT |
351 | // The default dynamic linker name. |
352 | const char* dynamic_linker; | |
75f65a3e | 353 | // The default text segment address. |
0c5e9c22 | 354 | uint64_t default_text_segment_address; |
75f65a3e ILT |
355 | // The ABI specified page size. |
356 | uint64_t abi_pagesize; | |
357 | // The common page size used by actual implementations. | |
358 | uint64_t common_pagesize; | |
8a5e3e08 ILT |
359 | // The special section index for small common symbols; SHN_UNDEF |
360 | // if none. | |
361 | elfcpp::Elf_Half small_common_shndx; | |
362 | // The special section index for large common symbols; SHN_UNDEF | |
363 | // if none. | |
364 | elfcpp::Elf_Half large_common_shndx; | |
365 | // Section flags for small common section. | |
366 | elfcpp::Elf_Xword small_common_section_flags; | |
367 | // Section flags for large common section. | |
368 | elfcpp::Elf_Xword large_common_section_flags; | |
05a352e6 DK |
369 | // Name of attributes section if it is not ".gnu.attributes". |
370 | const char* attributes_section; | |
371 | // Vendor name of vendor attributes. | |
372 | const char* attributes_vendor; | |
75f65a3e ILT |
373 | }; |
374 | ||
375 | Target(const Target_info* pti) | |
d5b40221 DK |
376 | : pti_(pti), processor_specific_flags_(0), |
377 | are_processor_specific_flags_set_(false) | |
14bfc3f5 ILT |
378 | { } |
379 | ||
8a5e3e08 ILT |
380 | // Virtual function which may be implemented by the child class. |
381 | virtual void | |
382 | do_new_output_section(Output_section*) const | |
383 | { } | |
384 | ||
5a6f7e2d ILT |
385 | // Virtual function which may be implemented by the child class. |
386 | virtual void | |
f59f41f3 | 387 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*) |
5a6f7e2d ILT |
388 | { } |
389 | ||
ab5c9e90 ILT |
390 | // Virtual function which may be implemented by the child class. |
391 | virtual uint64_t | |
392 | do_dynsym_value(const Symbol*) const | |
393 | { gold_unreachable(); } | |
394 | ||
c51e6221 ILT |
395 | // Virtual function which must be implemented by the child class if |
396 | // needed. | |
397 | virtual std::string | |
8851ecca | 398 | do_code_fill(section_size_type) const |
c51e6221 ILT |
399 | { gold_unreachable(); } |
400 | ||
9a2d6984 ILT |
401 | // Virtual function which may be implemented by the child class. |
402 | virtual bool | |
9c2d0ef9 | 403 | do_is_defined_by_abi(const Symbol*) const |
9a2d6984 ILT |
404 | { return false; } |
405 | ||
36959681 ILT |
406 | // Adjust the output file header before it is written out. VIEW |
407 | // points to the header in external form. LEN is the length, and | |
408 | // will be one of the values of elfcpp::Elf_sizes<size>::ehdr_size. | |
409 | // By default, we do nothing. | |
410 | virtual void | |
411 | do_adjust_elf_header(unsigned char*, int) const | |
412 | { } | |
413 | ||
bb04269c DK |
414 | // Virtual function which may be overriden by the child class. |
415 | virtual bool | |
416 | do_is_local_label_name(const char*) const; | |
417 | ||
e291e7b9 ILT |
418 | // Virtual function that must be overridden by a target which uses |
419 | // target specific relocations. | |
420 | virtual unsigned int | |
421 | do_reloc_symbol_index(void*, unsigned int) const | |
422 | { gold_unreachable(); } | |
423 | ||
424 | // Virtual function that must be overidden by a target which uses | |
425 | // target specific relocations. | |
426 | virtual uint64_t | |
427 | do_reloc_addend(void*, unsigned int, uint64_t) const | |
428 | { gold_unreachable(); } | |
429 | ||
364c7fa5 ILT |
430 | // Virtual function which may be overridden by the child class. |
431 | virtual void | |
432 | do_calls_non_split(Relobj* object, unsigned int, section_offset_type, | |
433 | section_size_type, unsigned char*, section_size_type, | |
434 | std::string*, std::string*) const; | |
435 | ||
f733487b DK |
436 | // make_elf_object hooks. There are four versions of these for |
437 | // different address sizes and endianities. | |
364c7fa5 | 438 | |
d5b40221 DK |
439 | // Set processor specific flags. |
440 | void | |
441 | set_processor_specific_flags(elfcpp::Elf_Word flags) | |
442 | { | |
443 | this->processor_specific_flags_ = flags; | |
444 | this->are_processor_specific_flags_set_ = true; | |
445 | } | |
446 | ||
f733487b DK |
447 | #ifdef HAVE_TARGET_32_LITTLE |
448 | // Virtual functions which may be overriden by the child class. | |
449 | virtual Object* | |
450 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
451 | const elfcpp::Ehdr<32, false>&); | |
452 | #endif | |
453 | ||
454 | #ifdef HAVE_TARGET_32_BIG | |
455 | // Virtual functions which may be overriden by the child class. | |
456 | virtual Object* | |
457 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
458 | const elfcpp::Ehdr<32, true>&); | |
459 | #endif | |
460 | ||
461 | #ifdef HAVE_TARGET_64_LITTLE | |
462 | // Virtual functions which may be overriden by the child class. | |
463 | virtual Object* | |
464 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
465 | const elfcpp::Ehdr<64, false>& ehdr); | |
466 | #endif | |
467 | ||
468 | #ifdef HAVE_TARGET_64_BIG | |
469 | // Virtual functions which may be overriden by the child class. | |
470 | virtual Object* | |
471 | do_make_elf_object(const std::string& name, Input_file* input_file, | |
472 | off_t offset, const elfcpp::Ehdr<64, true>& ehdr); | |
473 | #endif | |
474 | ||
c0a62865 DK |
475 | // Virtual functions which may be overriden by the child class. |
476 | virtual Output_section* | |
477 | do_make_output_section(const char* name, elfcpp::Elf_Word type, | |
478 | elfcpp::Elf_Xword flags); | |
479 | ||
20e6d0d6 DK |
480 | // Virtual function which may be overriden by the child class. |
481 | virtual bool | |
482 | do_may_relax() const | |
483 | { return parameters->options().relax(); } | |
484 | ||
485 | // Virtual function which may be overriden by the child class. | |
486 | virtual bool | |
c0a62865 | 487 | do_relax(int, const Input_objects*, Symbol_table*, Layout*) |
20e6d0d6 DK |
488 | { return false; } |
489 | ||
364c7fa5 ILT |
490 | // A function for targets to call. Return whether BYTES/LEN matches |
491 | // VIEW/VIEW_SIZE at OFFSET. | |
492 | bool | |
493 | match_view(const unsigned char* view, section_size_type view_size, | |
494 | section_offset_type offset, const char* bytes, size_t len) const; | |
495 | ||
496 | // Set the contents of a VIEW/VIEW_SIZE to nops starting at OFFSET | |
497 | // for LEN bytes. | |
498 | void | |
499 | set_view_to_nop(unsigned char* view, section_size_type view_size, | |
500 | section_offset_type offset, size_t len) const; | |
501 | ||
05a352e6 DK |
502 | // This must be overriden by the child class if it has target-specific |
503 | // attributes subsection in the attribute section. | |
504 | virtual int | |
505 | do_attribute_arg_type(int) const | |
506 | { gold_unreachable(); } | |
507 | ||
508 | // This may be overridden by the child class. | |
509 | virtual int | |
510 | do_attributes_order(int num) const | |
511 | { return num; } | |
512 | ||
14bfc3f5 | 513 | private: |
f733487b DK |
514 | // The implementations of the four do_make_elf_object virtual functions are |
515 | // almost identical except for their sizes and endianity. We use a template. | |
516 | // for their implementations. | |
517 | template<int size, bool big_endian> | |
518 | inline Object* | |
519 | do_make_elf_object_implementation(const std::string&, Input_file*, off_t, | |
520 | const elfcpp::Ehdr<size, big_endian>&); | |
521 | ||
14bfc3f5 ILT |
522 | Target(const Target&); |
523 | Target& operator=(const Target&); | |
524 | ||
75f65a3e ILT |
525 | // The target information. |
526 | const Target_info* pti_; | |
d5b40221 DK |
527 | // Processor-specific flags. |
528 | elfcpp::Elf_Word processor_specific_flags_; | |
529 | // Whether the processor-specific flags are set at least once. | |
530 | bool are_processor_specific_flags_set_; | |
bae7f79e ILT |
531 | }; |
532 | ||
14bfc3f5 ILT |
533 | // The abstract class for a specific size and endianness of target. |
534 | // Each actual target implementation class should derive from an | |
535 | // instantiation of Sized_target. | |
536 | ||
537 | template<int size, bool big_endian> | |
538 | class Sized_target : public Target | |
539 | { | |
540 | public: | |
541 | // Make a new symbol table entry for the target. This should be | |
542 | // overridden by a target which needs additional information in the | |
543 | // symbol table. This will only be called if has_make_symbol() | |
544 | // returns true. | |
545 | virtual Sized_symbol<size>* | |
14b31740 | 546 | make_symbol() const |
a3ad94ed | 547 | { gold_unreachable(); } |
14bfc3f5 ILT |
548 | |
549 | // Resolve a symbol for the target. This should be overridden by a | |
550 | // target which needs to take special action. TO is the | |
551 | // pre-existing symbol. SYM is the new symbol, seen in OBJECT. | |
14b31740 ILT |
552 | // VERSION is the version of SYM. This will only be called if |
553 | // has_resolve() returns true. | |
14bfc3f5 | 554 | virtual void |
14b31740 ILT |
555 | resolve(Symbol*, const elfcpp::Sym<size, big_endian>&, Object*, |
556 | const char*) | |
a3ad94ed | 557 | { gold_unreachable(); } |
14bfc3f5 | 558 | |
6d03d481 ST |
559 | // Process the relocs for a section, and record information of the |
560 | // mapping from source to destination sections. This mapping is later | |
561 | // used to determine unreferenced garbage sections. This procedure is | |
562 | // only called during garbage collection. | |
563 | virtual void | |
ad0f2072 ILT |
564 | gc_process_relocs(Symbol_table* symtab, |
565 | Layout* layout, | |
566 | Sized_relobj<size, big_endian>* object, | |
567 | unsigned int data_shndx, | |
568 | unsigned int sh_type, | |
569 | const unsigned char* prelocs, | |
570 | size_t reloc_count, | |
571 | Output_section* output_section, | |
572 | bool needs_special_offset_handling, | |
573 | size_t local_symbol_count, | |
574 | const unsigned char* plocal_symbols) = 0; | |
6d03d481 | 575 | |
92e059d8 | 576 | // Scan the relocs for a section, and record any information |
ad0f2072 ILT |
577 | // required for the symbol. SYMTAB is the symbol table. OBJECT is |
578 | // the object in which the section appears. DATA_SHNDX is the | |
579 | // section index that these relocs apply to. SH_TYPE is the type of | |
580 | // the relocation section, SHT_REL or SHT_RELA. PRELOCS points to | |
581 | // the relocation data. RELOC_COUNT is the number of relocs. | |
582 | // LOCAL_SYMBOL_COUNT is the number of local symbols. | |
583 | // OUTPUT_SECTION is the output section. | |
730cdc88 ILT |
584 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if offsets to the output |
585 | // sections are not mapped as usual. PLOCAL_SYMBOLS points to the | |
586 | // local symbol data from OBJECT. GLOBAL_SYMBOLS is the array of | |
587 | // pointers to the global symbol table from OBJECT. | |
61ba1cf9 | 588 | virtual void |
ad0f2072 | 589 | scan_relocs(Symbol_table* symtab, |
ead1e424 | 590 | Layout* layout, |
f6ce93d6 | 591 | Sized_relobj<size, big_endian>* object, |
a3ad94ed | 592 | unsigned int data_shndx, |
92e059d8 ILT |
593 | unsigned int sh_type, |
594 | const unsigned char* prelocs, | |
595 | size_t reloc_count, | |
730cdc88 ILT |
596 | Output_section* output_section, |
597 | bool needs_special_offset_handling, | |
92e059d8 | 598 | size_t local_symbol_count, |
730cdc88 | 599 | const unsigned char* plocal_symbols) = 0; |
92e059d8 ILT |
600 | |
601 | // Relocate section data. SH_TYPE is the type of the relocation | |
602 | // section, SHT_REL or SHT_RELA. PRELOCS points to the relocation | |
730cdc88 ILT |
603 | // information. RELOC_COUNT is the number of relocs. |
604 | // OUTPUT_SECTION is the output section. | |
605 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if offsets must be mapped | |
606 | // to correspond to the output section. VIEW is a view into the | |
607 | // output file holding the section contents, VIEW_ADDRESS is the | |
608 | // virtual address of the view, and VIEW_SIZE is the size of the | |
609 | // view. If NEEDS_SPECIAL_OFFSET_HANDLING is true, the VIEW_xx | |
610 | // parameters refer to the complete output section data, not just | |
611 | // the input section data. | |
92e059d8 ILT |
612 | virtual void |
613 | relocate_section(const Relocate_info<size, big_endian>*, | |
614 | unsigned int sh_type, | |
615 | const unsigned char* prelocs, | |
616 | size_t reloc_count, | |
730cdc88 ILT |
617 | Output_section* output_section, |
618 | bool needs_special_offset_handling, | |
92e059d8 ILT |
619 | unsigned char* view, |
620 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
364c7fa5 ILT |
621 | section_size_type view_size, |
622 | const Reloc_symbol_changes*) = 0; | |
61ba1cf9 | 623 | |
6a74a719 ILT |
624 | // Scan the relocs during a relocatable link. The parameters are |
625 | // like scan_relocs, with an additional Relocatable_relocs | |
626 | // parameter, used to record the disposition of the relocs. | |
627 | virtual void | |
ad0f2072 | 628 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
629 | Layout* layout, |
630 | Sized_relobj<size, big_endian>* object, | |
631 | unsigned int data_shndx, | |
632 | unsigned int sh_type, | |
633 | const unsigned char* prelocs, | |
634 | size_t reloc_count, | |
635 | Output_section* output_section, | |
636 | bool needs_special_offset_handling, | |
637 | size_t local_symbol_count, | |
638 | const unsigned char* plocal_symbols, | |
639 | Relocatable_relocs*) = 0; | |
640 | ||
641 | // Relocate a section during a relocatable link. The parameters are | |
642 | // like relocate_section, with additional parameters for the view of | |
643 | // the output reloc section. | |
644 | virtual void | |
645 | relocate_for_relocatable(const Relocate_info<size, big_endian>*, | |
646 | unsigned int sh_type, | |
647 | const unsigned char* prelocs, | |
648 | size_t reloc_count, | |
649 | Output_section* output_section, | |
650 | off_t offset_in_output_section, | |
651 | const Relocatable_relocs*, | |
652 | unsigned char* view, | |
653 | typename elfcpp::Elf_types<size>::Elf_Addr | |
654 | view_address, | |
655 | section_size_type view_size, | |
656 | unsigned char* reloc_view, | |
657 | section_size_type reloc_view_size) = 0; | |
658 | ||
14bfc3f5 | 659 | protected: |
75f65a3e ILT |
660 | Sized_target(const Target::Target_info* pti) |
661 | : Target(pti) | |
662 | { | |
a3ad94ed ILT |
663 | gold_assert(pti->size == size); |
664 | gold_assert(pti->is_big_endian ? big_endian : !big_endian); | |
75f65a3e | 665 | } |
14bfc3f5 | 666 | }; |
bae7f79e ILT |
667 | |
668 | } // End namespace gold. | |
669 | ||
670 | #endif // !defined(GOLD_TARGET_H) |