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42cacb20 DE |
1 | // powerpc.cc -- powerpc target support for gold. |
2 | ||
0e70b911 | 3 | // Copyright 2008, 2009, 2010 Free Software Foundation, Inc. |
42cacb20 DE |
4 | // Written by David S. Miller <davem@davemloft.net> |
5 | // and David Edelsohn <edelsohn@gnu.org> | |
6 | ||
7 | // This file is part of gold. | |
8 | ||
9 | // This program is free software; you can redistribute it and/or modify | |
10 | // it under the terms of the GNU General Public License as published by | |
11 | // the Free Software Foundation; either version 3 of the License, or | |
12 | // (at your option) any later version. | |
13 | ||
14 | // This program is distributed in the hope that it will be useful, | |
15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | // GNU General Public License for more details. | |
18 | ||
19 | // You should have received a copy of the GNU General Public License | |
20 | // along with this program; if not, write to the Free Software | |
21 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | // MA 02110-1301, USA. | |
23 | ||
24 | #include "gold.h" | |
25 | ||
26 | #include "elfcpp.h" | |
27 | #include "parameters.h" | |
28 | #include "reloc.h" | |
29 | #include "powerpc.h" | |
30 | #include "object.h" | |
31 | #include "symtab.h" | |
32 | #include "layout.h" | |
33 | #include "output.h" | |
34 | #include "copy-relocs.h" | |
35 | #include "target.h" | |
36 | #include "target-reloc.h" | |
37 | #include "target-select.h" | |
38 | #include "tls.h" | |
39 | #include "errors.h" | |
f345227a | 40 | #include "gc.h" |
42cacb20 DE |
41 | |
42 | namespace | |
43 | { | |
44 | ||
45 | using namespace gold; | |
46 | ||
47 | template<int size, bool big_endian> | |
48 | class Output_data_plt_powerpc; | |
49 | ||
50 | template<int size, bool big_endian> | |
51 | class Target_powerpc : public Sized_target<size, big_endian> | |
52 | { | |
53 | public: | |
54 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section; | |
55 | ||
56 | Target_powerpc() | |
57 | : Sized_target<size, big_endian>(&powerpc_info), | |
58 | got_(NULL), got2_(NULL), toc_(NULL), | |
59 | plt_(NULL), rela_dyn_(NULL), | |
60 | copy_relocs_(elfcpp::R_POWERPC_COPY), | |
61 | dynbss_(NULL), got_mod_index_offset_(-1U) | |
62 | { | |
63 | } | |
64 | ||
6d03d481 ST |
65 | // Process the relocations to determine unreferenced sections for |
66 | // garbage collection. | |
67 | void | |
ad0f2072 | 68 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
69 | Layout* layout, |
70 | Sized_relobj<size, big_endian>* object, | |
71 | unsigned int data_shndx, | |
72 | unsigned int sh_type, | |
73 | const unsigned char* prelocs, | |
74 | size_t reloc_count, | |
75 | Output_section* output_section, | |
76 | bool needs_special_offset_handling, | |
77 | size_t local_symbol_count, | |
78 | const unsigned char* plocal_symbols); | |
79 | ||
42cacb20 DE |
80 | // Scan the relocations to look for symbol adjustments. |
81 | void | |
ad0f2072 | 82 | scan_relocs(Symbol_table* symtab, |
42cacb20 DE |
83 | Layout* layout, |
84 | Sized_relobj<size, big_endian>* object, | |
85 | unsigned int data_shndx, | |
86 | unsigned int sh_type, | |
87 | const unsigned char* prelocs, | |
88 | size_t reloc_count, | |
89 | Output_section* output_section, | |
90 | bool needs_special_offset_handling, | |
91 | size_t local_symbol_count, | |
92 | const unsigned char* plocal_symbols); | |
93 | // Finalize the sections. | |
94 | void | |
f59f41f3 | 95 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
42cacb20 DE |
96 | |
97 | // Return the value to use for a dynamic which requires special | |
98 | // treatment. | |
99 | uint64_t | |
100 | do_dynsym_value(const Symbol*) const; | |
101 | ||
102 | // Relocate a section. | |
103 | void | |
104 | relocate_section(const Relocate_info<size, big_endian>*, | |
105 | unsigned int sh_type, | |
106 | const unsigned char* prelocs, | |
107 | size_t reloc_count, | |
108 | Output_section* output_section, | |
109 | bool needs_special_offset_handling, | |
110 | unsigned char* view, | |
111 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
364c7fa5 ILT |
112 | section_size_type view_size, |
113 | const Reloc_symbol_changes*); | |
42cacb20 DE |
114 | |
115 | // Scan the relocs during a relocatable link. | |
116 | void | |
ad0f2072 | 117 | scan_relocatable_relocs(Symbol_table* symtab, |
42cacb20 DE |
118 | Layout* layout, |
119 | Sized_relobj<size, big_endian>* object, | |
120 | unsigned int data_shndx, | |
121 | unsigned int sh_type, | |
122 | const unsigned char* prelocs, | |
123 | size_t reloc_count, | |
124 | Output_section* output_section, | |
125 | bool needs_special_offset_handling, | |
126 | size_t local_symbol_count, | |
127 | const unsigned char* plocal_symbols, | |
128 | Relocatable_relocs*); | |
129 | ||
130 | // Relocate a section during a relocatable link. | |
131 | void | |
132 | relocate_for_relocatable(const Relocate_info<size, big_endian>*, | |
133 | unsigned int sh_type, | |
134 | const unsigned char* prelocs, | |
135 | size_t reloc_count, | |
136 | Output_section* output_section, | |
137 | off_t offset_in_output_section, | |
138 | const Relocatable_relocs*, | |
139 | unsigned char* view, | |
140 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
141 | section_size_type view_size, | |
142 | unsigned char* reloc_view, | |
143 | section_size_type reloc_view_size); | |
144 | ||
145 | // Return whether SYM is defined by the ABI. | |
146 | bool | |
9c2d0ef9 | 147 | do_is_defined_by_abi(const Symbol* sym) const |
42cacb20 DE |
148 | { |
149 | return strcmp(sym->name(), "___tls_get_addr") == 0; | |
150 | } | |
151 | ||
152 | // Return the size of the GOT section. | |
153 | section_size_type | |
0e70b911 | 154 | got_size() const |
42cacb20 DE |
155 | { |
156 | gold_assert(this->got_ != NULL); | |
157 | return this->got_->data_size(); | |
158 | } | |
159 | ||
0e70b911 CC |
160 | // Return the number of entries in the GOT. |
161 | unsigned int | |
162 | got_entry_count() const | |
163 | { | |
164 | if (this->got_ == NULL) | |
165 | return 0; | |
166 | return this->got_size() / (size / 8); | |
167 | } | |
168 | ||
169 | // Return the number of entries in the PLT. | |
170 | unsigned int | |
171 | plt_entry_count() const; | |
172 | ||
173 | // Return the offset of the first non-reserved PLT entry. | |
174 | unsigned int | |
175 | first_plt_entry_offset() const; | |
176 | ||
177 | // Return the size of each PLT entry. | |
178 | unsigned int | |
179 | plt_entry_size() const; | |
180 | ||
42cacb20 DE |
181 | private: |
182 | ||
183 | // The class which scans relocations. | |
184 | class Scan | |
185 | { | |
186 | public: | |
187 | Scan() | |
188 | : issued_non_pic_error_(false) | |
189 | { } | |
190 | ||
191 | inline void | |
ad0f2072 | 192 | local(Symbol_table* symtab, Layout* layout, Target_powerpc* target, |
42cacb20 DE |
193 | Sized_relobj<size, big_endian>* object, |
194 | unsigned int data_shndx, | |
195 | Output_section* output_section, | |
196 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, | |
197 | const elfcpp::Sym<size, big_endian>& lsym); | |
198 | ||
199 | inline void | |
ad0f2072 | 200 | global(Symbol_table* symtab, Layout* layout, Target_powerpc* target, |
42cacb20 DE |
201 | Sized_relobj<size, big_endian>* object, |
202 | unsigned int data_shndx, | |
203 | Output_section* output_section, | |
204 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, | |
205 | Symbol* gsym); | |
206 | ||
21bb3914 ST |
207 | inline bool |
208 | local_reloc_may_be_function_pointer(Symbol_table* , Layout* , | |
209 | Target_powerpc* , | |
210 | Sized_relobj<size, big_endian>* , | |
211 | unsigned int , | |
212 | Output_section* , | |
213 | const elfcpp::Rela<size, big_endian>& , | |
214 | unsigned int , | |
215 | const elfcpp::Sym<size, big_endian>&) | |
216 | { return false; } | |
217 | ||
218 | inline bool | |
219 | global_reloc_may_be_function_pointer(Symbol_table* , Layout* , | |
220 | Target_powerpc* , | |
221 | Sized_relobj<size, big_endian>* , | |
222 | unsigned int , | |
223 | Output_section* , | |
224 | const elfcpp::Rela<size, | |
225 | big_endian>& , | |
226 | unsigned int , Symbol*) | |
227 | { return false; } | |
228 | ||
42cacb20 DE |
229 | private: |
230 | static void | |
231 | unsupported_reloc_local(Sized_relobj<size, big_endian>*, | |
232 | unsigned int r_type); | |
233 | ||
234 | static void | |
235 | unsupported_reloc_global(Sized_relobj<size, big_endian>*, | |
236 | unsigned int r_type, Symbol*); | |
237 | ||
238 | static void | |
239 | generate_tls_call(Symbol_table* symtab, Layout* layout, | |
240 | Target_powerpc* target); | |
241 | ||
242 | void | |
243 | check_non_pic(Relobj*, unsigned int r_type); | |
244 | ||
245 | // Whether we have issued an error about a non-PIC compilation. | |
246 | bool issued_non_pic_error_; | |
247 | }; | |
248 | ||
249 | // The class which implements relocation. | |
250 | class Relocate | |
251 | { | |
252 | public: | |
253 | // Do a relocation. Return false if the caller should not issue | |
254 | // any warnings about this relocation. | |
255 | inline bool | |
256 | relocate(const Relocate_info<size, big_endian>*, Target_powerpc*, | |
031cdbed ILT |
257 | Output_section*, size_t relnum, |
258 | const elfcpp::Rela<size, big_endian>&, | |
42cacb20 DE |
259 | unsigned int r_type, const Sized_symbol<size>*, |
260 | const Symbol_value<size>*, | |
261 | unsigned char*, | |
262 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
263 | section_size_type); | |
264 | ||
265 | private: | |
266 | // Do a TLS relocation. | |
267 | inline void | |
268 | relocate_tls(const Relocate_info<size, big_endian>*, | |
269 | Target_powerpc* target, | |
270 | size_t relnum, const elfcpp::Rela<size, big_endian>&, | |
271 | unsigned int r_type, const Sized_symbol<size>*, | |
272 | const Symbol_value<size>*, | |
273 | unsigned char*, | |
274 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
275 | section_size_type); | |
276 | }; | |
277 | ||
278 | // A class which returns the size required for a relocation type, | |
279 | // used while scanning relocs during a relocatable link. | |
280 | class Relocatable_size_for_reloc | |
281 | { | |
282 | public: | |
283 | unsigned int | |
284 | get_size_for_reloc(unsigned int, Relobj*); | |
285 | }; | |
286 | ||
287 | // Get the GOT section, creating it if necessary. | |
288 | Output_data_got<size, big_endian>* | |
289 | got_section(Symbol_table*, Layout*); | |
290 | ||
291 | Output_data_space* | |
292 | got2_section() const | |
293 | { | |
ca09d69a | 294 | gold_assert(this->got2_ != NULL); |
42cacb20 DE |
295 | return this->got2_; |
296 | } | |
297 | ||
298 | // Get the TOC section. | |
299 | Output_data_space* | |
300 | toc_section() const | |
301 | { | |
ca09d69a | 302 | gold_assert(this->toc_ != NULL); |
42cacb20 DE |
303 | return this->toc_; |
304 | } | |
305 | ||
306 | // Create a PLT entry for a global symbol. | |
307 | void | |
308 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
309 | ||
310 | // Create a GOT entry for the TLS module index. | |
311 | unsigned int | |
312 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
313 | Sized_relobj<size, big_endian>* object); | |
314 | ||
315 | // Get the PLT section. | |
316 | const Output_data_plt_powerpc<size, big_endian>* | |
317 | plt_section() const | |
318 | { | |
319 | gold_assert(this->plt_ != NULL); | |
320 | return this->plt_; | |
321 | } | |
322 | ||
323 | // Get the dynamic reloc section, creating it if necessary. | |
324 | Reloc_section* | |
325 | rela_dyn_section(Layout*); | |
326 | ||
42cacb20 DE |
327 | // Copy a relocation against a global symbol. |
328 | void | |
ef9beddf ILT |
329 | copy_reloc(Symbol_table* symtab, Layout* layout, |
330 | Sized_relobj<size, big_endian>* object, | |
42cacb20 DE |
331 | unsigned int shndx, Output_section* output_section, |
332 | Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) | |
333 | { | |
334 | this->copy_relocs_.copy_reloc(symtab, layout, | |
335 | symtab->get_sized_symbol<size>(sym), | |
336 | object, shndx, output_section, | |
337 | reloc, this->rela_dyn_section(layout)); | |
338 | } | |
339 | ||
340 | // Information about this specific target which we pass to the | |
341 | // general Target structure. | |
342 | static Target::Target_info powerpc_info; | |
343 | ||
344 | // The types of GOT entries needed for this platform. | |
0e70b911 CC |
345 | // These values are exposed to the ABI in an incremental link. |
346 | // Do not renumber existing values without changing the version | |
347 | // number of the .gnu_incremental_inputs section. | |
42cacb20 DE |
348 | enum Got_type |
349 | { | |
350 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
351 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
352 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
353 | }; | |
354 | ||
355 | // The GOT section. | |
356 | Output_data_got<size, big_endian>* got_; | |
357 | // The GOT2 section. | |
358 | Output_data_space* got2_; | |
359 | // The TOC section. | |
360 | Output_data_space* toc_; | |
361 | // The PLT section. | |
362 | Output_data_plt_powerpc<size, big_endian>* plt_; | |
363 | // The dynamic reloc section. | |
364 | Reloc_section* rela_dyn_; | |
365 | // Relocs saved to avoid a COPY reloc. | |
366 | Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; | |
367 | // Space for variables copied with a COPY reloc. | |
368 | Output_data_space* dynbss_; | |
369 | // Offset of the GOT entry for the TLS module index; | |
370 | unsigned int got_mod_index_offset_; | |
371 | }; | |
372 | ||
373 | template<> | |
374 | Target::Target_info Target_powerpc<32, true>::powerpc_info = | |
375 | { | |
376 | 32, // size | |
377 | true, // is_big_endian | |
378 | elfcpp::EM_PPC, // machine_code | |
379 | false, // has_make_symbol | |
380 | false, // has_resolve | |
381 | false, // has_code_fill | |
382 | true, // is_default_stack_executable | |
383 | '\0', // wrap_char | |
384 | "/usr/lib/ld.so.1", // dynamic_linker | |
385 | 0x10000000, // default_text_segment_address | |
386 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) | |
8a5e3e08 ILT |
387 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
388 | elfcpp::SHN_UNDEF, // small_common_shndx | |
389 | elfcpp::SHN_UNDEF, // large_common_shndx | |
390 | 0, // small_common_section_flags | |
05a352e6 DK |
391 | 0, // large_common_section_flags |
392 | NULL, // attributes_section | |
393 | NULL // attributes_vendor | |
42cacb20 DE |
394 | }; |
395 | ||
396 | template<> | |
397 | Target::Target_info Target_powerpc<32, false>::powerpc_info = | |
398 | { | |
399 | 32, // size | |
400 | false, // is_big_endian | |
401 | elfcpp::EM_PPC, // machine_code | |
402 | false, // has_make_symbol | |
403 | false, // has_resolve | |
404 | false, // has_code_fill | |
405 | true, // is_default_stack_executable | |
406 | '\0', // wrap_char | |
407 | "/usr/lib/ld.so.1", // dynamic_linker | |
408 | 0x10000000, // default_text_segment_address | |
409 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) | |
8a5e3e08 ILT |
410 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
411 | elfcpp::SHN_UNDEF, // small_common_shndx | |
412 | elfcpp::SHN_UNDEF, // large_common_shndx | |
413 | 0, // small_common_section_flags | |
05a352e6 DK |
414 | 0, // large_common_section_flags |
415 | NULL, // attributes_section | |
416 | NULL // attributes_vendor | |
42cacb20 DE |
417 | }; |
418 | ||
419 | template<> | |
420 | Target::Target_info Target_powerpc<64, true>::powerpc_info = | |
421 | { | |
422 | 64, // size | |
423 | true, // is_big_endian | |
424 | elfcpp::EM_PPC64, // machine_code | |
425 | false, // has_make_symbol | |
426 | false, // has_resolve | |
427 | false, // has_code_fill | |
428 | true, // is_default_stack_executable | |
429 | '\0', // wrap_char | |
430 | "/usr/lib/ld.so.1", // dynamic_linker | |
431 | 0x10000000, // default_text_segment_address | |
432 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) | |
8a5e3e08 ILT |
433 | 8 * 1024, // common_pagesize (overridable by -z common-page-size) |
434 | elfcpp::SHN_UNDEF, // small_common_shndx | |
435 | elfcpp::SHN_UNDEF, // large_common_shndx | |
436 | 0, // small_common_section_flags | |
05a352e6 DK |
437 | 0, // large_common_section_flags |
438 | NULL, // attributes_section | |
439 | NULL // attributes_vendor | |
42cacb20 DE |
440 | }; |
441 | ||
442 | template<> | |
443 | Target::Target_info Target_powerpc<64, false>::powerpc_info = | |
444 | { | |
445 | 64, // size | |
446 | false, // is_big_endian | |
447 | elfcpp::EM_PPC64, // machine_code | |
448 | false, // has_make_symbol | |
449 | false, // has_resolve | |
450 | false, // has_code_fill | |
451 | true, // is_default_stack_executable | |
452 | '\0', // wrap_char | |
453 | "/usr/lib/ld.so.1", // dynamic_linker | |
454 | 0x10000000, // default_text_segment_address | |
455 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) | |
8a5e3e08 ILT |
456 | 8 * 1024, // common_pagesize (overridable by -z common-page-size) |
457 | elfcpp::SHN_UNDEF, // small_common_shndx | |
458 | elfcpp::SHN_UNDEF, // large_common_shndx | |
459 | 0, // small_common_section_flags | |
05a352e6 DK |
460 | 0, // large_common_section_flags |
461 | NULL, // attributes_section | |
462 | NULL // attributes_vendor | |
42cacb20 DE |
463 | }; |
464 | ||
465 | template<int size, bool big_endian> | |
466 | class Powerpc_relocate_functions | |
467 | { | |
468 | private: | |
469 | // Do a simple relocation with the addend in the relocation. | |
470 | template<int valsize> | |
471 | static inline void | |
472 | rela(unsigned char* view, | |
473 | unsigned int right_shift, | |
474 | elfcpp::Elf_Xword dst_mask, | |
475 | typename elfcpp::Swap<size, big_endian>::Valtype value, | |
476 | typename elfcpp::Swap<size, big_endian>::Valtype addend) | |
477 | { | |
478 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
479 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
480 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
481 | Valtype reloc = ((value + addend) >> right_shift); | |
482 | ||
483 | val &= ~dst_mask; | |
484 | reloc &= dst_mask; | |
485 | ||
486 | elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc); | |
487 | } | |
488 | ||
489 | // Do a simple relocation using a symbol value with the addend in | |
490 | // the relocation. | |
491 | template<int valsize> | |
492 | static inline void | |
493 | rela(unsigned char* view, | |
494 | unsigned int right_shift, | |
495 | elfcpp::Elf_Xword dst_mask, | |
496 | const Sized_relobj<size, big_endian>* object, | |
497 | const Symbol_value<size>* psymval, | |
498 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
499 | { | |
500 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
501 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
502 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
503 | Valtype reloc = (psymval->value(object, addend) >> right_shift); | |
504 | ||
505 | val &= ~dst_mask; | |
506 | reloc &= dst_mask; | |
507 | ||
508 | elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc); | |
509 | } | |
510 | ||
511 | // Do a simple relocation using a symbol value with the addend in | |
512 | // the relocation, unaligned. | |
513 | template<int valsize> | |
514 | static inline void | |
515 | rela_ua(unsigned char* view, unsigned int right_shift, | |
516 | elfcpp::Elf_Xword dst_mask, | |
517 | const Sized_relobj<size, big_endian>* object, | |
518 | const Symbol_value<size>* psymval, | |
519 | typename elfcpp::Swap<size, big_endian>::Valtype addend) | |
520 | { | |
521 | typedef typename elfcpp::Swap_unaligned<valsize, | |
522 | big_endian>::Valtype Valtype; | |
523 | unsigned char* wv = view; | |
524 | Valtype val = elfcpp::Swap_unaligned<valsize, big_endian>::readval(wv); | |
525 | Valtype reloc = (psymval->value(object, addend) >> right_shift); | |
526 | ||
527 | val &= ~dst_mask; | |
528 | reloc &= dst_mask; | |
529 | ||
530 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, val | reloc); | |
531 | } | |
532 | ||
533 | // Do a simple PC relative relocation with a Symbol_value with the | |
534 | // addend in the relocation. | |
535 | template<int valsize> | |
536 | static inline void | |
537 | pcrela(unsigned char* view, unsigned int right_shift, | |
538 | elfcpp::Elf_Xword dst_mask, | |
539 | const Sized_relobj<size, big_endian>* object, | |
540 | const Symbol_value<size>* psymval, | |
541 | typename elfcpp::Swap<size, big_endian>::Valtype addend, | |
542 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
543 | { | |
544 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
545 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
546 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
547 | Valtype reloc = ((psymval->value(object, addend) - address) | |
548 | >> right_shift); | |
549 | ||
550 | val &= ~dst_mask; | |
551 | reloc &= dst_mask; | |
552 | ||
553 | elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc); | |
554 | } | |
555 | ||
556 | template<int valsize> | |
557 | static inline void | |
558 | pcrela_unaligned(unsigned char* view, | |
559 | const Sized_relobj<size, big_endian>* object, | |
560 | const Symbol_value<size>* psymval, | |
561 | typename elfcpp::Swap<size, big_endian>::Valtype addend, | |
562 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
563 | { | |
564 | typedef typename elfcpp::Swap_unaligned<valsize, | |
565 | big_endian>::Valtype Valtype; | |
566 | unsigned char* wv = view; | |
567 | Valtype reloc = (psymval->value(object, addend) - address); | |
568 | ||
569 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, reloc); | |
570 | } | |
571 | ||
572 | typedef Powerpc_relocate_functions<size, big_endian> This; | |
573 | typedef Relocate_functions<size, big_endian> This_reloc; | |
574 | public: | |
575 | // R_POWERPC_REL32: (Symbol + Addend - Address) | |
576 | static inline void | |
577 | rel32(unsigned char* view, | |
578 | const Sized_relobj<size, big_endian>* object, | |
579 | const Symbol_value<size>* psymval, | |
580 | typename elfcpp::Elf_types<size>::Elf_Addr addend, | |
581 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
582 | { This_reloc::pcrela32(view, object, psymval, addend, address); } | |
583 | ||
584 | // R_POWERPC_REL24: (Symbol + Addend - Address) & 0x3fffffc | |
585 | static inline void | |
586 | rel24(unsigned char* view, | |
587 | const Sized_relobj<size, big_endian>* object, | |
588 | const Symbol_value<size>* psymval, | |
589 | typename elfcpp::Elf_types<size>::Elf_Addr addend, | |
590 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
591 | { | |
592 | This::template pcrela<32>(view, 0, 0x03fffffc, object, | |
593 | psymval, addend, address); | |
594 | } | |
595 | ||
596 | // R_POWERPC_REL14: (Symbol + Addend - Address) & 0xfffc | |
597 | static inline void | |
598 | rel14(unsigned char* view, | |
599 | const Sized_relobj<size, big_endian>* object, | |
600 | const Symbol_value<size>* psymval, | |
601 | typename elfcpp::Elf_types<size>::Elf_Addr addend, | |
602 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
603 | { | |
604 | This::template pcrela<32>(view, 0, 0x0000fffc, object, | |
605 | psymval, addend, address); | |
606 | } | |
607 | ||
608 | // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff | |
609 | static inline void | |
610 | addr16(unsigned char* view, | |
611 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
612 | typename elfcpp::Elf_types<size>::Elf_Addr addend) | |
613 | { This_reloc::rela16(view, value, addend); } | |
614 | ||
615 | static inline void | |
616 | addr16(unsigned char* view, | |
617 | const Sized_relobj<size, big_endian>* object, | |
618 | const Symbol_value<size>* psymval, | |
619 | typename elfcpp::Elf_types<size>::Elf_Addr addend) | |
620 | { This_reloc::rela16(view, object, psymval, addend); } | |
621 | ||
622 | // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc | |
623 | static inline void | |
624 | addr16_ds(unsigned char* view, | |
625 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
626 | typename elfcpp::Elf_types<size>::Elf_Addr addend) | |
627 | { | |
628 | This::template rela<16>(view, 0, 0xfffc, value, addend); | |
629 | } | |
630 | ||
631 | // R_POWERPC_ADDR16_LO: (Symbol + Addend) & 0xffff | |
632 | static inline void | |
633 | addr16_lo(unsigned char* view, | |
634 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
635 | typename elfcpp::Elf_types<size>::Elf_Addr addend) | |
636 | { This_reloc::rela16(view, value, addend); } | |
637 | ||
638 | static inline void | |
639 | addr16_lo(unsigned char* view, | |
640 | const Sized_relobj<size, big_endian>* object, | |
641 | const Symbol_value<size>* psymval, | |
642 | typename elfcpp::Elf_types<size>::Elf_Addr addend) | |
643 | { This_reloc::rela16(view, object, psymval, addend); } | |
644 | ||
645 | // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff | |
646 | static inline void | |
647 | addr16_hi(unsigned char* view, | |
648 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
649 | typename elfcpp::Elf_types<size>::Elf_Addr addend) | |
650 | { | |
651 | This::template rela<16>(view, 16, 0xffff, value, addend); | |
652 | } | |
653 | ||
654 | static inline void | |
655 | addr16_hi(unsigned char* view, | |
656 | const Sized_relobj<size, big_endian>* object, | |
657 | const Symbol_value<size>* psymval, | |
658 | typename elfcpp::Elf_types<size>::Elf_Addr addend) | |
659 | { | |
660 | This::template rela<16>(view, 16, 0xffff, object, psymval, addend); | |
661 | } | |
662 | ||
663 | // R_POWERPC_ADDR16_HA: Same as R_POWERPC_ADDR16_HI except that if the | |
664 | // final value of the low 16 bits of the | |
665 | // relocation is negative, add one. | |
666 | static inline void | |
667 | addr16_ha(unsigned char* view, | |
668 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
669 | typename elfcpp::Elf_types<size>::Elf_Addr addend) | |
670 | { | |
42cacb20 DE |
671 | typename elfcpp::Elf_types<size>::Elf_Addr reloc; |
672 | ||
673 | reloc = value + addend; | |
674 | ||
675 | if (reloc & 0x8000) | |
676 | reloc += 0x10000; | |
677 | reloc >>= 16; | |
678 | ||
e6fde208 | 679 | elfcpp::Swap<16, big_endian>::writeval(view, reloc); |
42cacb20 DE |
680 | } |
681 | ||
682 | static inline void | |
683 | addr16_ha(unsigned char* view, | |
684 | const Sized_relobj<size, big_endian>* object, | |
685 | const Symbol_value<size>* psymval, | |
686 | typename elfcpp::Elf_types<size>::Elf_Addr addend) | |
687 | { | |
42cacb20 DE |
688 | typename elfcpp::Elf_types<size>::Elf_Addr reloc; |
689 | ||
690 | reloc = psymval->value(object, addend); | |
691 | ||
692 | if (reloc & 0x8000) | |
693 | reloc += 0x10000; | |
694 | reloc >>= 16; | |
695 | ||
e6fde208 | 696 | elfcpp::Swap<16, big_endian>::writeval(view, reloc); |
42cacb20 DE |
697 | } |
698 | ||
699 | // R_PPC_REL16: (Symbol + Addend - Address) & 0xffff | |
700 | static inline void | |
701 | rel16(unsigned char* view, | |
702 | const Sized_relobj<size, big_endian>* object, | |
703 | const Symbol_value<size>* psymval, | |
704 | typename elfcpp::Elf_types<size>::Elf_Addr addend, | |
705 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
706 | { This_reloc::pcrela16(view, object, psymval, addend, address); } | |
707 | ||
708 | // R_PPC_REL16_LO: (Symbol + Addend - Address) & 0xffff | |
709 | static inline void | |
710 | rel16_lo(unsigned char* view, | |
711 | const Sized_relobj<size, big_endian>* object, | |
712 | const Symbol_value<size>* psymval, | |
713 | typename elfcpp::Elf_types<size>::Elf_Addr addend, | |
714 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
715 | { This_reloc::pcrela16(view, object, psymval, addend, address); } | |
716 | ||
717 | // R_PPC_REL16_HI: ((Symbol + Addend - Address) >> 16) & 0xffff | |
718 | static inline void | |
719 | rel16_hi(unsigned char* view, | |
720 | const Sized_relobj<size, big_endian>* object, | |
721 | const Symbol_value<size>* psymval, | |
722 | typename elfcpp::Elf_types<size>::Elf_Addr addend, | |
723 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
724 | { | |
725 | This::template pcrela<16>(view, 16, 0xffff, object, | |
726 | psymval, addend, address); | |
727 | } | |
728 | ||
729 | // R_PPC_REL16_HA: Same as R_PPC_REL16_HI except that if the | |
730 | // final value of the low 16 bits of the | |
731 | // relocation is negative, add one. | |
732 | static inline void | |
733 | rel16_ha(unsigned char* view, | |
734 | const Sized_relobj<size, big_endian>* object, | |
735 | const Symbol_value<size>* psymval, | |
736 | typename elfcpp::Elf_types<size>::Elf_Addr addend, | |
737 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
738 | { | |
42cacb20 DE |
739 | typename elfcpp::Elf_types<size>::Elf_Addr reloc; |
740 | ||
741 | reloc = (psymval->value(object, addend) - address); | |
742 | if (reloc & 0x8000) | |
743 | reloc += 0x10000; | |
744 | reloc >>= 16; | |
745 | ||
83d22aa8 | 746 | elfcpp::Swap<16, big_endian>::writeval(view, reloc); |
42cacb20 DE |
747 | } |
748 | }; | |
749 | ||
750 | // Get the GOT section, creating it if necessary. | |
751 | ||
752 | template<int size, bool big_endian> | |
753 | Output_data_got<size, big_endian>* | |
754 | Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab, | |
755 | Layout* layout) | |
756 | { | |
757 | if (this->got_ == NULL) | |
758 | { | |
759 | gold_assert(symtab != NULL && layout != NULL); | |
760 | ||
761 | this->got_ = new Output_data_got<size, big_endian>(); | |
762 | ||
763 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
764 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
22f0da72 | 765 | this->got_, ORDER_DATA, false); |
42cacb20 DE |
766 | |
767 | // Create the GOT2 or TOC in the .got section. | |
768 | if (size == 32) | |
769 | { | |
770 | this->got2_ = new Output_data_space(4, "** GOT2"); | |
771 | layout->add_output_section_data(".got2", elfcpp::SHT_PROGBITS, | |
772 | elfcpp::SHF_ALLOC | |
773 | | elfcpp::SHF_WRITE, | |
22f0da72 | 774 | this->got2_, ORDER_DATA, false); |
42cacb20 DE |
775 | } |
776 | else | |
777 | { | |
778 | this->toc_ = new Output_data_space(8, "** TOC"); | |
779 | layout->add_output_section_data(".toc", elfcpp::SHT_PROGBITS, | |
780 | elfcpp::SHF_ALLOC | |
781 | | elfcpp::SHF_WRITE, | |
22f0da72 | 782 | this->toc_, ORDER_DATA, false); |
42cacb20 DE |
783 | } |
784 | ||
785 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section. | |
786 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
99fff23b | 787 | Symbol_table::PREDEFINED, |
42cacb20 DE |
788 | this->got_, |
789 | 0, 0, elfcpp::STT_OBJECT, | |
790 | elfcpp::STB_LOCAL, | |
791 | elfcpp::STV_HIDDEN, 0, | |
792 | false, false); | |
793 | } | |
794 | ||
795 | return this->got_; | |
796 | } | |
797 | ||
798 | // Get the dynamic reloc section, creating it if necessary. | |
799 | ||
800 | template<int size, bool big_endian> | |
801 | typename Target_powerpc<size, big_endian>::Reloc_section* | |
802 | Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout) | |
803 | { | |
804 | if (this->rela_dyn_ == NULL) | |
805 | { | |
806 | gold_assert(layout != NULL); | |
807 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); | |
808 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
22f0da72 ILT |
809 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
810 | ORDER_DYNAMIC_RELOCS, false); | |
42cacb20 DE |
811 | } |
812 | return this->rela_dyn_; | |
813 | } | |
814 | ||
815 | // A class to handle the PLT data. | |
816 | ||
817 | template<int size, bool big_endian> | |
818 | class Output_data_plt_powerpc : public Output_section_data | |
819 | { | |
820 | public: | |
821 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, | |
822 | size, big_endian> Reloc_section; | |
823 | ||
824 | Output_data_plt_powerpc(Layout*); | |
825 | ||
826 | // Add an entry to the PLT. | |
827 | void add_entry(Symbol* gsym); | |
828 | ||
829 | // Return the .rela.plt section data. | |
830 | const Reloc_section* rel_plt() const | |
831 | { | |
832 | return this->rel_; | |
833 | } | |
834 | ||
0e70b911 CC |
835 | // Return the number of PLT entries. |
836 | unsigned int | |
837 | entry_count() const | |
838 | { return this->count_; } | |
839 | ||
840 | // Return the offset of the first non-reserved PLT entry. | |
841 | static unsigned int | |
842 | first_plt_entry_offset() | |
843 | { return 4 * base_plt_entry_size; } | |
844 | ||
845 | // Return the size of a PLT entry. | |
846 | static unsigned int | |
847 | get_plt_entry_size() | |
848 | { return base_plt_entry_size; } | |
849 | ||
42cacb20 DE |
850 | protected: |
851 | void do_adjust_output_section(Output_section* os); | |
852 | ||
853 | private: | |
854 | // The size of an entry in the PLT. | |
855 | static const int base_plt_entry_size = (size == 32 ? 16 : 24); | |
856 | ||
857 | // Set the final size. | |
858 | void | |
859 | set_final_data_size() | |
860 | { | |
861 | unsigned int full_count = this->count_ + 4; | |
862 | ||
863 | this->set_data_size(full_count * base_plt_entry_size); | |
864 | } | |
865 | ||
866 | // Write out the PLT data. | |
867 | void | |
868 | do_write(Output_file*); | |
869 | ||
870 | // The reloc section. | |
871 | Reloc_section* rel_; | |
872 | // The number of PLT entries. | |
873 | unsigned int count_; | |
874 | }; | |
875 | ||
876 | // Create the PLT section. The ordinary .got section is an argument, | |
877 | // since we need to refer to the start. | |
878 | ||
879 | template<int size, bool big_endian> | |
880 | Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(Layout* layout) | |
881 | : Output_section_data(size == 32 ? 4 : 8), count_(0) | |
882 | { | |
883 | this->rel_ = new Reloc_section(false); | |
884 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
22f0da72 ILT |
885 | elfcpp::SHF_ALLOC, this->rel_, |
886 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
42cacb20 DE |
887 | } |
888 | ||
889 | template<int size, bool big_endian> | |
890 | void | |
891 | Output_data_plt_powerpc<size, big_endian>::do_adjust_output_section(Output_section* os) | |
892 | { | |
893 | os->set_entsize(0); | |
894 | } | |
895 | ||
896 | // Add an entry to the PLT. | |
897 | ||
898 | template<int size, bool big_endian> | |
899 | void | |
900 | Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym) | |
901 | { | |
902 | gold_assert(!gsym->has_plt_offset()); | |
903 | unsigned int index = this->count_+ + 4; | |
904 | section_offset_type plt_offset; | |
905 | ||
906 | if (index < 8192) | |
907 | plt_offset = index * base_plt_entry_size; | |
908 | else | |
909 | gold_unreachable(); | |
910 | ||
911 | gsym->set_plt_offset(plt_offset); | |
912 | ||
913 | ++this->count_; | |
914 | ||
915 | gsym->set_needs_dynsym_entry(); | |
916 | this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this, | |
917 | plt_offset, 0); | |
918 | } | |
919 | ||
920 | static const unsigned int addis_11_11 = 0x3d6b0000; | |
921 | static const unsigned int addis_11_30 = 0x3d7e0000; | |
922 | static const unsigned int addis_12_12 = 0x3d8c0000; | |
923 | static const unsigned int addi_11_11 = 0x396b0000; | |
924 | static const unsigned int add_0_11_11 = 0x7c0b5a14; | |
925 | static const unsigned int add_11_0_11 = 0x7d605a14; | |
926 | static const unsigned int b = 0x48000000; | |
927 | static const unsigned int bcl_20_31 = 0x429f0005; | |
928 | static const unsigned int bctr = 0x4e800420; | |
929 | static const unsigned int lis_11 = 0x3d600000; | |
930 | static const unsigned int lis_12 = 0x3d800000; | |
931 | static const unsigned int lwzu_0_12 = 0x840c0000; | |
932 | static const unsigned int lwz_0_12 = 0x800c0000; | |
933 | static const unsigned int lwz_11_11 = 0x816b0000; | |
934 | static const unsigned int lwz_11_30 = 0x817e0000; | |
935 | static const unsigned int lwz_12_12 = 0x818c0000; | |
936 | static const unsigned int mflr_0 = 0x7c0802a6; | |
937 | static const unsigned int mflr_12 = 0x7d8802a6; | |
938 | static const unsigned int mtctr_0 = 0x7c0903a6; | |
939 | static const unsigned int mtctr_11 = 0x7d6903a6; | |
940 | static const unsigned int mtlr_0 = 0x7c0803a6; | |
941 | static const unsigned int nop = 0x60000000; | |
942 | static const unsigned int sub_11_11_12 = 0x7d6c5850; | |
943 | ||
944 | static const unsigned int addis_r12_r2 = 0x3d820000; /* addis %r12,%r2,xxx@ha */ | |
945 | static const unsigned int std_r2_40r1 = 0xf8410028; /* std %r2,40(%r1) */ | |
946 | static const unsigned int ld_r11_0r12 = 0xe96c0000; /* ld %r11,xxx+0@l(%r12) */ | |
947 | static const unsigned int ld_r2_0r12 = 0xe84c0000; /* ld %r2,xxx+8@l(%r12) */ | |
948 | /* ld %r11,xxx+16@l(%r12) */ | |
949 | ||
950 | ||
951 | // Write out the PLT. | |
952 | ||
953 | template<int size, bool big_endian> | |
954 | void | |
955 | Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of) | |
956 | { | |
2ea97941 | 957 | const off_t offset = this->offset(); |
42cacb20 DE |
958 | const section_size_type oview_size = |
959 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 960 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
42cacb20 DE |
961 | unsigned char* pov = oview; |
962 | ||
963 | memset(pov, 0, base_plt_entry_size * 4); | |
964 | pov += base_plt_entry_size * 4; | |
965 | ||
966 | unsigned int plt_offset = base_plt_entry_size * 4; | |
967 | const unsigned int count = this->count_; | |
968 | ||
969 | if (size == 64) | |
970 | { | |
971 | for (unsigned int i = 0; i < count; i++) | |
972 | { | |
973 | } | |
974 | } | |
975 | else | |
976 | { | |
977 | for (unsigned int i = 0; i < count; i++) | |
978 | { | |
979 | elfcpp::Swap<32, true>::writeval(pov + 0x00, | |
980 | lwz_11_30 + plt_offset); | |
981 | elfcpp::Swap<32, true>::writeval(pov + 0x04, mtctr_11); | |
982 | elfcpp::Swap<32, true>::writeval(pov + 0x08, bctr); | |
ce3ac18a | 983 | elfcpp::Swap<32, true>::writeval(pov + 0x0c, nop); |
42cacb20 DE |
984 | pov += base_plt_entry_size; |
985 | plt_offset += base_plt_entry_size; | |
986 | } | |
987 | } | |
988 | ||
989 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); | |
990 | ||
2ea97941 | 991 | of->write_output_view(offset, oview_size, oview); |
42cacb20 DE |
992 | } |
993 | ||
994 | // Create a PLT entry for a global symbol. | |
995 | ||
996 | template<int size, bool big_endian> | |
997 | void | |
998 | Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab, | |
999 | Layout* layout, | |
1000 | Symbol* gsym) | |
1001 | { | |
1002 | if (gsym->has_plt_offset()) | |
1003 | return; | |
1004 | ||
1005 | if (this->plt_ == NULL) | |
1006 | { | |
1007 | // Create the GOT section first. | |
1008 | this->got_section(symtab, layout); | |
1009 | ||
612a8d3d DM |
1010 | // Ensure that .rela.dyn always appears before .rela.plt This is |
1011 | // necessary due to how, on PowerPC and some other targets, .rela.dyn | |
1012 | // needs to include .rela.plt in it's range. | |
1013 | this->rela_dyn_section(layout); | |
1014 | ||
42cacb20 DE |
1015 | this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout); |
1016 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
1017 | (elfcpp::SHF_ALLOC | |
1018 | | elfcpp::SHF_EXECINSTR | |
1019 | | elfcpp::SHF_WRITE), | |
22f0da72 | 1020 | this->plt_, ORDER_PLT, false); |
42cacb20 DE |
1021 | |
1022 | // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section. | |
1023 | symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL, | |
99fff23b | 1024 | Symbol_table::PREDEFINED, |
42cacb20 DE |
1025 | this->plt_, |
1026 | 0, 0, elfcpp::STT_OBJECT, | |
1027 | elfcpp::STB_LOCAL, | |
1028 | elfcpp::STV_HIDDEN, 0, | |
1029 | false, false); | |
1030 | } | |
1031 | ||
1032 | this->plt_->add_entry(gsym); | |
1033 | } | |
1034 | ||
0e70b911 CC |
1035 | // Return the number of entries in the PLT. |
1036 | ||
1037 | template<int size, bool big_endian> | |
1038 | unsigned int | |
1039 | Target_powerpc<size, big_endian>::plt_entry_count() const | |
1040 | { | |
1041 | if (this->plt_ == NULL) | |
1042 | return 0; | |
1043 | return this->plt_->entry_count(); | |
1044 | } | |
1045 | ||
1046 | // Return the offset of the first non-reserved PLT entry. | |
1047 | ||
1048 | template<int size, bool big_endian> | |
1049 | unsigned int | |
1050 | Target_powerpc<size, big_endian>::first_plt_entry_offset() const | |
1051 | { | |
1052 | return Output_data_plt_powerpc<size, big_endian>::first_plt_entry_offset(); | |
1053 | } | |
1054 | ||
1055 | // Return the size of each PLT entry. | |
1056 | ||
1057 | template<int size, bool big_endian> | |
1058 | unsigned int | |
1059 | Target_powerpc<size, big_endian>::plt_entry_size() const | |
1060 | { | |
1061 | return Output_data_plt_powerpc<size, big_endian>::get_plt_entry_size(); | |
1062 | } | |
1063 | ||
42cacb20 DE |
1064 | // Create a GOT entry for the TLS module index. |
1065 | ||
1066 | template<int size, bool big_endian> | |
1067 | unsigned int | |
1068 | Target_powerpc<size, big_endian>::got_mod_index_entry(Symbol_table* symtab, | |
1069 | Layout* layout, | |
1070 | Sized_relobj<size, big_endian>* object) | |
1071 | { | |
1072 | if (this->got_mod_index_offset_ == -1U) | |
1073 | { | |
1074 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1075 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
1076 | Output_data_got<size, big_endian>* got; | |
1077 | unsigned int got_offset; | |
1078 | ||
1079 | got = this->got_section(symtab, layout); | |
1080 | got_offset = got->add_constant(0); | |
1081 | rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got, | |
1082 | got_offset, 0); | |
1083 | got->add_constant(0); | |
1084 | this->got_mod_index_offset_ = got_offset; | |
1085 | } | |
1086 | return this->got_mod_index_offset_; | |
1087 | } | |
1088 | ||
1089 | // Optimize the TLS relocation type based on what we know about the | |
1090 | // symbol. IS_FINAL is true if the final address of this symbol is | |
1091 | // known at link time. | |
1092 | ||
1093 | static tls::Tls_optimization | |
1094 | optimize_tls_reloc(bool /* is_final */, int r_type) | |
1095 | { | |
1096 | // If we are generating a shared library, then we can't do anything | |
1097 | // in the linker. | |
1098 | if (parameters->options().shared()) | |
1099 | return tls::TLSOPT_NONE; | |
1100 | switch (r_type) | |
1101 | { | |
1102 | // XXX | |
1103 | default: | |
1104 | gold_unreachable(); | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | // Report an unsupported relocation against a local symbol. | |
1109 | ||
1110 | template<int size, bool big_endian> | |
1111 | void | |
1112 | Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local( | |
1113 | Sized_relobj<size, big_endian>* object, | |
1114 | unsigned int r_type) | |
1115 | { | |
1116 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
1117 | object->name().c_str(), r_type); | |
1118 | } | |
1119 | ||
1120 | // We are about to emit a dynamic relocation of type R_TYPE. If the | |
1121 | // dynamic linker does not support it, issue an error. | |
1122 | ||
1123 | template<int size, bool big_endian> | |
1124 | void | |
1125 | Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object, | |
1126 | unsigned int r_type) | |
1127 | { | |
1128 | gold_assert(r_type != elfcpp::R_POWERPC_NONE); | |
1129 | ||
1130 | // These are the relocation types supported by glibc for both 32-bit | |
1131 | // and 64-bit powerpc. | |
1132 | switch (r_type) | |
1133 | { | |
1134 | case elfcpp::R_POWERPC_RELATIVE: | |
1135 | case elfcpp::R_POWERPC_GLOB_DAT: | |
1136 | case elfcpp::R_POWERPC_DTPMOD: | |
1137 | case elfcpp::R_POWERPC_DTPREL: | |
1138 | case elfcpp::R_POWERPC_TPREL: | |
1139 | case elfcpp::R_POWERPC_JMP_SLOT: | |
1140 | case elfcpp::R_POWERPC_COPY: | |
1141 | case elfcpp::R_POWERPC_ADDR32: | |
1142 | case elfcpp::R_POWERPC_ADDR24: | |
1143 | case elfcpp::R_POWERPC_REL24: | |
1144 | return; | |
1145 | ||
1146 | default: | |
1147 | break; | |
1148 | } | |
1149 | ||
1150 | if (size == 64) | |
1151 | { | |
1152 | switch (r_type) | |
1153 | { | |
1154 | // These are the relocation types supported only on 64-bit. | |
1155 | case elfcpp::R_PPC64_ADDR64: | |
1156 | case elfcpp::R_PPC64_TPREL16_LO_DS: | |
1157 | case elfcpp::R_PPC64_TPREL16_DS: | |
1158 | case elfcpp::R_POWERPC_TPREL16: | |
1159 | case elfcpp::R_POWERPC_TPREL16_LO: | |
1160 | case elfcpp::R_POWERPC_TPREL16_HI: | |
1161 | case elfcpp::R_POWERPC_TPREL16_HA: | |
1162 | case elfcpp::R_PPC64_TPREL16_HIGHER: | |
1163 | case elfcpp::R_PPC64_TPREL16_HIGHEST: | |
1164 | case elfcpp::R_PPC64_TPREL16_HIGHERA: | |
1165 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: | |
1166 | case elfcpp::R_PPC64_ADDR16_LO_DS: | |
1167 | case elfcpp::R_POWERPC_ADDR16_LO: | |
1168 | case elfcpp::R_POWERPC_ADDR16_HI: | |
1169 | case elfcpp::R_POWERPC_ADDR16_HA: | |
1170 | case elfcpp::R_POWERPC_ADDR30: | |
1171 | case elfcpp::R_PPC64_UADDR64: | |
1172 | case elfcpp::R_POWERPC_UADDR32: | |
1173 | case elfcpp::R_POWERPC_ADDR16: | |
1174 | case elfcpp::R_POWERPC_UADDR16: | |
1175 | case elfcpp::R_PPC64_ADDR16_DS: | |
1176 | case elfcpp::R_PPC64_ADDR16_HIGHER: | |
1177 | case elfcpp::R_PPC64_ADDR16_HIGHEST: | |
1178 | case elfcpp::R_PPC64_ADDR16_HIGHERA: | |
1179 | case elfcpp::R_PPC64_ADDR16_HIGHESTA: | |
1180 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: | |
1181 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: | |
1182 | case elfcpp::R_POWERPC_REL32: | |
1183 | case elfcpp::R_PPC64_REL64: | |
1184 | return; | |
1185 | ||
1186 | default: | |
1187 | break; | |
1188 | } | |
1189 | } | |
1190 | else | |
1191 | { | |
1192 | switch (r_type) | |
1193 | { | |
1194 | // These are the relocation types supported only on 32-bit. | |
1195 | ||
1196 | default: | |
1197 | break; | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | // This prevents us from issuing more than one error per reloc | |
1202 | // section. But we can still wind up issuing more than one | |
1203 | // error per object file. | |
1204 | if (this->issued_non_pic_error_) | |
1205 | return; | |
33aea2fd | 1206 | gold_assert(parameters->options().output_is_position_independent()); |
42cacb20 DE |
1207 | object->error(_("requires unsupported dynamic reloc; " |
1208 | "recompile with -fPIC")); | |
1209 | this->issued_non_pic_error_ = true; | |
1210 | return; | |
1211 | } | |
1212 | ||
1213 | // Scan a relocation for a local symbol. | |
1214 | ||
1215 | template<int size, bool big_endian> | |
1216 | inline void | |
1217 | Target_powerpc<size, big_endian>::Scan::local( | |
42cacb20 DE |
1218 | Symbol_table* symtab, |
1219 | Layout* layout, | |
1220 | Target_powerpc<size, big_endian>* target, | |
1221 | Sized_relobj<size, big_endian>* object, | |
1222 | unsigned int data_shndx, | |
1223 | Output_section* output_section, | |
1224 | const elfcpp::Rela<size, big_endian>& reloc, | |
1225 | unsigned int r_type, | |
1226 | const elfcpp::Sym<size, big_endian>& lsym) | |
1227 | { | |
1228 | switch (r_type) | |
1229 | { | |
1230 | case elfcpp::R_POWERPC_NONE: | |
1231 | case elfcpp::R_POWERPC_GNU_VTINHERIT: | |
1232 | case elfcpp::R_POWERPC_GNU_VTENTRY: | |
1233 | break; | |
1234 | ||
1235 | case elfcpp::R_PPC64_ADDR64: | |
1236 | case elfcpp::R_POWERPC_ADDR32: | |
1237 | case elfcpp::R_POWERPC_ADDR16_HA: | |
1238 | case elfcpp::R_POWERPC_ADDR16_LO: | |
1239 | // If building a shared library (or a position-independent | |
1240 | // executable), we need to create a dynamic relocation for | |
1241 | // this location. | |
1242 | if (parameters->options().output_is_position_independent()) | |
1243 | { | |
1244 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
1245 | ||
1246 | check_non_pic(object, r_type); | |
1247 | if (lsym.get_st_type() != elfcpp::STT_SECTION) | |
1248 | { | |
1249 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
1250 | rela_dyn->add_local(object, r_sym, r_type, output_section, | |
1251 | data_shndx, reloc.get_r_offset(), | |
1252 | reloc.get_r_addend()); | |
1253 | } | |
1254 | else | |
1255 | { | |
1256 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
1257 | gold_assert(lsym.get_st_value() == 0); | |
1258 | rela_dyn->add_local_relative(object, r_sym, r_type, | |
1259 | output_section, data_shndx, | |
1260 | reloc.get_r_offset(), | |
1261 | reloc.get_r_addend()); | |
1262 | } | |
1263 | } | |
1264 | break; | |
1265 | ||
1266 | case elfcpp::R_POWERPC_REL24: | |
1267 | case elfcpp::R_PPC_LOCAL24PC: | |
1268 | case elfcpp::R_POWERPC_REL32: | |
1269 | case elfcpp::R_PPC_REL16_LO: | |
1270 | case elfcpp::R_PPC_REL16_HA: | |
1271 | break; | |
1272 | ||
1273 | case elfcpp::R_POWERPC_GOT16: | |
1274 | case elfcpp::R_POWERPC_GOT16_LO: | |
1275 | case elfcpp::R_POWERPC_GOT16_HI: | |
1276 | case elfcpp::R_POWERPC_GOT16_HA: | |
1277 | case elfcpp::R_PPC64_TOC16: | |
1278 | case elfcpp::R_PPC64_TOC16_LO: | |
1279 | case elfcpp::R_PPC64_TOC16_HI: | |
1280 | case elfcpp::R_PPC64_TOC16_HA: | |
1281 | case elfcpp::R_PPC64_TOC16_DS: | |
1282 | case elfcpp::R_PPC64_TOC16_LO_DS: | |
1283 | { | |
1284 | // The symbol requires a GOT entry. | |
1285 | Output_data_got<size, big_endian>* got; | |
1286 | unsigned int r_sym; | |
1287 | ||
1288 | got = target->got_section(symtab, layout); | |
1289 | r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
1290 | ||
1291 | // If we are generating a shared object, we need to add a | |
1292 | // dynamic relocation for this symbol's GOT entry. | |
1293 | if (parameters->options().output_is_position_independent()) | |
1294 | { | |
1295 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)) | |
1296 | { | |
1297 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
1298 | unsigned int off; | |
1299 | ||
1300 | off = got->add_constant(0); | |
1301 | object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off); | |
1302 | rela_dyn->add_local_relative(object, r_sym, | |
1303 | elfcpp::R_POWERPC_RELATIVE, | |
1304 | got, off, 0); | |
1305 | } | |
1306 | } | |
1307 | else | |
1308 | got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1309 | } | |
1310 | break; | |
1311 | ||
1312 | case elfcpp::R_PPC64_TOC: | |
1313 | // We need a GOT section. | |
1314 | target->got_section(symtab, layout); | |
1315 | break; | |
1316 | ||
1317 | // These are relocations which should only be seen by the | |
1318 | // dynamic linker, and should never be seen here. | |
1319 | case elfcpp::R_POWERPC_COPY: | |
1320 | case elfcpp::R_POWERPC_GLOB_DAT: | |
1321 | case elfcpp::R_POWERPC_JMP_SLOT: | |
1322 | case elfcpp::R_POWERPC_RELATIVE: | |
1323 | case elfcpp::R_POWERPC_DTPMOD: | |
1324 | gold_error(_("%s: unexpected reloc %u in object file"), | |
1325 | object->name().c_str(), r_type); | |
1326 | break; | |
1327 | ||
1328 | default: | |
1329 | unsupported_reloc_local(object, r_type); | |
1330 | break; | |
1331 | } | |
1332 | } | |
1333 | ||
1334 | // Report an unsupported relocation against a global symbol. | |
1335 | ||
1336 | template<int size, bool big_endian> | |
1337 | void | |
1338 | Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global( | |
1339 | Sized_relobj<size, big_endian>* object, | |
1340 | unsigned int r_type, | |
1341 | Symbol* gsym) | |
1342 | { | |
1343 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), | |
1344 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); | |
1345 | } | |
1346 | ||
1347 | // Scan a relocation for a global symbol. | |
1348 | ||
1349 | template<int size, bool big_endian> | |
1350 | inline void | |
1351 | Target_powerpc<size, big_endian>::Scan::global( | |
42cacb20 DE |
1352 | Symbol_table* symtab, |
1353 | Layout* layout, | |
1354 | Target_powerpc<size, big_endian>* target, | |
1355 | Sized_relobj<size, big_endian>* object, | |
1356 | unsigned int data_shndx, | |
1357 | Output_section* output_section, | |
1358 | const elfcpp::Rela<size, big_endian>& reloc, | |
1359 | unsigned int r_type, | |
1360 | Symbol* gsym) | |
1361 | { | |
1362 | switch (r_type) | |
1363 | { | |
1364 | case elfcpp::R_POWERPC_NONE: | |
1365 | case elfcpp::R_POWERPC_GNU_VTINHERIT: | |
1366 | case elfcpp::R_POWERPC_GNU_VTENTRY: | |
1367 | break; | |
1368 | ||
1369 | case elfcpp::R_PPC_PLTREL24: | |
1370 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1371 | // Otherwise we need a PLT entry. | |
1372 | if (gsym->final_value_is_known()) | |
1373 | break; | |
1374 | // If building a shared library, we can also skip the PLT entry | |
1375 | // if the symbol is defined in the output file and is protected | |
1376 | // or hidden. | |
1377 | if (gsym->is_defined() | |
1378 | && !gsym->is_from_dynobj() | |
1379 | && !gsym->is_preemptible()) | |
1380 | break; | |
1381 | target->make_plt_entry(symtab, layout, gsym); | |
1382 | break; | |
1383 | ||
1384 | case elfcpp::R_POWERPC_ADDR16: | |
1385 | case elfcpp::R_POWERPC_ADDR16_LO: | |
1386 | case elfcpp::R_POWERPC_ADDR16_HI: | |
1387 | case elfcpp::R_POWERPC_ADDR16_HA: | |
1388 | case elfcpp::R_POWERPC_ADDR32: | |
1389 | case elfcpp::R_PPC64_ADDR64: | |
1390 | { | |
1391 | // Make a PLT entry if necessary. | |
1392 | if (gsym->needs_plt_entry()) | |
1393 | { | |
1394 | target->make_plt_entry(symtab, layout, gsym); | |
1395 | // Since this is not a PC-relative relocation, we may be | |
1396 | // taking the address of a function. In that case we need to | |
1397 | // set the entry in the dynamic symbol table to the address of | |
1398 | // the PLT entry. | |
1399 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
1400 | gsym->set_needs_dynsym_value(); | |
1401 | } | |
1402 | // Make a dynamic relocation if necessary. | |
1403 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) | |
1404 | { | |
966d4097 | 1405 | if (gsym->may_need_copy_reloc()) |
42cacb20 DE |
1406 | { |
1407 | target->copy_reloc(symtab, layout, object, | |
1408 | data_shndx, output_section, gsym, reloc); | |
1409 | } | |
1410 | else if ((r_type == elfcpp::R_POWERPC_ADDR32 | |
1411 | || r_type == elfcpp::R_PPC64_ADDR64) | |
1412 | && gsym->can_use_relative_reloc(false)) | |
1413 | { | |
1414 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
1415 | rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE, | |
1416 | output_section, object, | |
1417 | data_shndx, reloc.get_r_offset(), | |
1418 | reloc.get_r_addend()); | |
1419 | } | |
1420 | else | |
1421 | { | |
1422 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
1423 | ||
1424 | check_non_pic(object, r_type); | |
1425 | if (gsym->is_from_dynobj() | |
1426 | || gsym->is_undefined() | |
1427 | || gsym->is_preemptible()) | |
1428 | rela_dyn->add_global(gsym, r_type, output_section, | |
1429 | object, data_shndx, | |
1430 | reloc.get_r_offset(), | |
1431 | reloc.get_r_addend()); | |
1432 | else | |
1433 | rela_dyn->add_global_relative(gsym, r_type, | |
1434 | output_section, object, | |
1435 | data_shndx, | |
1436 | reloc.get_r_offset(), | |
1437 | reloc.get_r_addend()); | |
1438 | } | |
1439 | } | |
1440 | } | |
1441 | break; | |
1442 | ||
1443 | case elfcpp::R_POWERPC_REL24: | |
1444 | case elfcpp::R_PPC_LOCAL24PC: | |
1445 | case elfcpp::R_PPC_REL16: | |
1446 | case elfcpp::R_PPC_REL16_LO: | |
1447 | case elfcpp::R_PPC_REL16_HI: | |
1448 | case elfcpp::R_PPC_REL16_HA: | |
1449 | { | |
1450 | if (gsym->needs_plt_entry()) | |
1451 | target->make_plt_entry(symtab, layout, gsym); | |
1452 | // Make a dynamic relocation if necessary. | |
1453 | int flags = Symbol::NON_PIC_REF; | |
1454 | if (gsym->type() == elfcpp::STT_FUNC) | |
1455 | flags |= Symbol::FUNCTION_CALL; | |
1456 | if (gsym->needs_dynamic_reloc(flags)) | |
1457 | { | |
966d4097 | 1458 | if (gsym->may_need_copy_reloc()) |
42cacb20 DE |
1459 | { |
1460 | target->copy_reloc(symtab, layout, object, | |
1461 | data_shndx, output_section, gsym, | |
1462 | reloc); | |
1463 | } | |
1464 | else | |
1465 | { | |
1466 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
1467 | check_non_pic(object, r_type); | |
1468 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
1469 | data_shndx, reloc.get_r_offset(), | |
1470 | reloc.get_r_addend()); | |
1471 | } | |
1472 | } | |
1473 | } | |
1474 | break; | |
1475 | ||
1476 | case elfcpp::R_POWERPC_GOT16: | |
1477 | case elfcpp::R_POWERPC_GOT16_LO: | |
1478 | case elfcpp::R_POWERPC_GOT16_HI: | |
1479 | case elfcpp::R_POWERPC_GOT16_HA: | |
1480 | case elfcpp::R_PPC64_TOC16: | |
1481 | case elfcpp::R_PPC64_TOC16_LO: | |
1482 | case elfcpp::R_PPC64_TOC16_HI: | |
1483 | case elfcpp::R_PPC64_TOC16_HA: | |
1484 | case elfcpp::R_PPC64_TOC16_DS: | |
1485 | case elfcpp::R_PPC64_TOC16_LO_DS: | |
1486 | { | |
1487 | // The symbol requires a GOT entry. | |
1488 | Output_data_got<size, big_endian>* got; | |
1489 | ||
1490 | got = target->got_section(symtab, layout); | |
1491 | if (gsym->final_value_is_known()) | |
1492 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
1493 | else | |
1494 | { | |
1495 | // If this symbol is not fully resolved, we need to add a | |
1496 | // dynamic relocation for it. | |
1497 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
1498 | if (gsym->is_from_dynobj() | |
1499 | || gsym->is_undefined() | |
1500 | || gsym->is_preemptible()) | |
1501 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, | |
1502 | elfcpp::R_POWERPC_GLOB_DAT); | |
1503 | else if (!gsym->has_got_offset(GOT_TYPE_STANDARD)) | |
1504 | { | |
1505 | unsigned int off = got->add_constant(0); | |
1506 | ||
1507 | gsym->set_got_offset(GOT_TYPE_STANDARD, off); | |
1508 | rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE, | |
1509 | got, off, 0); | |
1510 | } | |
1511 | } | |
1512 | } | |
1513 | break; | |
1514 | ||
1515 | case elfcpp::R_PPC64_TOC: | |
1516 | // We need a GOT section. | |
1517 | target->got_section(symtab, layout); | |
1518 | break; | |
1519 | ||
1520 | case elfcpp::R_POWERPC_GOT_TPREL16: | |
1521 | case elfcpp::R_POWERPC_TLS: | |
1522 | // XXX TLS | |
1523 | break; | |
1524 | ||
1525 | // These are relocations which should only be seen by the | |
1526 | // dynamic linker, and should never be seen here. | |
1527 | case elfcpp::R_POWERPC_COPY: | |
1528 | case elfcpp::R_POWERPC_GLOB_DAT: | |
1529 | case elfcpp::R_POWERPC_JMP_SLOT: | |
1530 | case elfcpp::R_POWERPC_RELATIVE: | |
1531 | case elfcpp::R_POWERPC_DTPMOD: | |
1532 | gold_error(_("%s: unexpected reloc %u in object file"), | |
1533 | object->name().c_str(), r_type); | |
1534 | break; | |
1535 | ||
1536 | default: | |
1537 | unsupported_reloc_global(object, r_type, gsym); | |
1538 | break; | |
1539 | } | |
1540 | } | |
1541 | ||
6d03d481 ST |
1542 | // Process relocations for gc. |
1543 | ||
1544 | template<int size, bool big_endian> | |
1545 | void | |
1546 | Target_powerpc<size, big_endian>::gc_process_relocs( | |
6d03d481 ST |
1547 | Symbol_table* symtab, |
1548 | Layout* layout, | |
1549 | Sized_relobj<size, big_endian>* object, | |
1550 | unsigned int data_shndx, | |
1551 | unsigned int, | |
1552 | const unsigned char* prelocs, | |
1553 | size_t reloc_count, | |
1554 | Output_section* output_section, | |
1555 | bool needs_special_offset_handling, | |
1556 | size_t local_symbol_count, | |
1557 | const unsigned char* plocal_symbols) | |
1558 | { | |
1559 | typedef Target_powerpc<size, big_endian> Powerpc; | |
2ea97941 | 1560 | typedef typename Target_powerpc<size, big_endian>::Scan Scan; |
6d03d481 | 1561 | |
41cbeecc | 1562 | gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan, |
3ff2ccb0 | 1563 | typename Target_powerpc::Relocatable_size_for_reloc>( |
6d03d481 ST |
1564 | symtab, |
1565 | layout, | |
1566 | this, | |
1567 | object, | |
1568 | data_shndx, | |
1569 | prelocs, | |
1570 | reloc_count, | |
1571 | output_section, | |
1572 | needs_special_offset_handling, | |
1573 | local_symbol_count, | |
1574 | plocal_symbols); | |
1575 | } | |
1576 | ||
42cacb20 DE |
1577 | // Scan relocations for a section. |
1578 | ||
1579 | template<int size, bool big_endian> | |
1580 | void | |
1581 | Target_powerpc<size, big_endian>::scan_relocs( | |
42cacb20 DE |
1582 | Symbol_table* symtab, |
1583 | Layout* layout, | |
1584 | Sized_relobj<size, big_endian>* object, | |
1585 | unsigned int data_shndx, | |
1586 | unsigned int sh_type, | |
1587 | const unsigned char* prelocs, | |
1588 | size_t reloc_count, | |
1589 | Output_section* output_section, | |
1590 | bool needs_special_offset_handling, | |
1591 | size_t local_symbol_count, | |
1592 | const unsigned char* plocal_symbols) | |
1593 | { | |
1594 | typedef Target_powerpc<size, big_endian> Powerpc; | |
2ea97941 | 1595 | typedef typename Target_powerpc<size, big_endian>::Scan Scan; |
42cacb20 DE |
1596 | static Output_data_space* sdata; |
1597 | ||
1598 | if (sh_type == elfcpp::SHT_REL) | |
1599 | { | |
1600 | gold_error(_("%s: unsupported REL reloc section"), | |
1601 | object->name().c_str()); | |
1602 | return; | |
1603 | } | |
1604 | ||
1605 | // Define _SDA_BASE_ at the start of the .sdata section. | |
1606 | if (sdata == NULL) | |
1607 | { | |
1608 | // layout->find_output_section(".sdata") == NULL | |
1609 | sdata = new Output_data_space(4, "** sdata"); | |
1610 | Output_section* os = layout->add_output_section_data(".sdata", 0, | |
1611 | elfcpp::SHF_ALLOC | |
1612 | | elfcpp::SHF_WRITE, | |
22f0da72 ILT |
1613 | sdata, |
1614 | ORDER_SMALL_DATA, | |
1615 | false); | |
42cacb20 | 1616 | symtab->define_in_output_data("_SDA_BASE_", NULL, |
99fff23b | 1617 | Symbol_table::PREDEFINED, |
42cacb20 DE |
1618 | os, |
1619 | 32768, 0, | |
1620 | elfcpp::STT_OBJECT, | |
1621 | elfcpp::STB_LOCAL, | |
1622 | elfcpp::STV_HIDDEN, 0, | |
1623 | false, false); | |
1624 | } | |
1625 | ||
2ea97941 | 1626 | gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>( |
42cacb20 DE |
1627 | symtab, |
1628 | layout, | |
1629 | this, | |
1630 | object, | |
1631 | data_shndx, | |
1632 | prelocs, | |
1633 | reloc_count, | |
1634 | output_section, | |
1635 | needs_special_offset_handling, | |
1636 | local_symbol_count, | |
1637 | plocal_symbols); | |
1638 | } | |
1639 | ||
1640 | // Finalize the sections. | |
1641 | ||
1642 | template<int size, bool big_endian> | |
1643 | void | |
d5b40221 DK |
1644 | Target_powerpc<size, big_endian>::do_finalize_sections( |
1645 | Layout* layout, | |
f59f41f3 DK |
1646 | const Input_objects*, |
1647 | Symbol_table*) | |
42cacb20 DE |
1648 | { |
1649 | // Fill in some more dynamic tags. | |
ea715a34 ILT |
1650 | const Reloc_section* rel_plt = (this->plt_ == NULL |
1651 | ? NULL | |
1652 | : this->plt_->rel_plt()); | |
1653 | layout->add_target_dynamic_tags(false, this->plt_, rel_plt, | |
612a8d3d | 1654 | this->rela_dyn_, true, size == 32); |
42cacb20 DE |
1655 | |
1656 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1657 | // relocs. | |
1658 | if (this->copy_relocs_.any_saved_relocs()) | |
1659 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
1660 | } | |
1661 | ||
1662 | // Perform a relocation. | |
1663 | ||
1664 | template<int size, bool big_endian> | |
1665 | inline bool | |
1666 | Target_powerpc<size, big_endian>::Relocate::relocate( | |
1667 | const Relocate_info<size, big_endian>* relinfo, | |
1668 | Target_powerpc* target, | |
031cdbed | 1669 | Output_section*, |
42cacb20 DE |
1670 | size_t relnum, |
1671 | const elfcpp::Rela<size, big_endian>& rela, | |
1672 | unsigned int r_type, | |
1673 | const Sized_symbol<size>* gsym, | |
1674 | const Symbol_value<size>* psymval, | |
1675 | unsigned char* view, | |
1676 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
1677 | section_size_type /* view_size */) | |
1678 | { | |
1679 | const unsigned int toc_base_offset = 0x8000; | |
1680 | typedef Powerpc_relocate_functions<size, big_endian> Reloc; | |
1681 | ||
1682 | // Pick the value to use for symbols defined in shared objects. | |
1683 | Symbol_value<size> symval; | |
1684 | if (gsym != NULL | |
de4c45bd ILT |
1685 | && gsym->use_plt_offset(r_type == elfcpp::R_POWERPC_REL24 |
1686 | || r_type == elfcpp::R_PPC_LOCAL24PC | |
1687 | || r_type == elfcpp::R_PPC_REL16 | |
1688 | || r_type == elfcpp::R_PPC_REL16_LO | |
1689 | || r_type == elfcpp::R_PPC_REL16_HI | |
1690 | || r_type == elfcpp::R_PPC_REL16_HA)) | |
42cacb20 DE |
1691 | { |
1692 | elfcpp::Elf_Xword value; | |
1693 | ||
1694 | value = target->plt_section()->address() + gsym->plt_offset(); | |
1695 | ||
1696 | symval.set_output_value(value); | |
1697 | ||
1698 | psymval = &symval; | |
1699 | } | |
1700 | ||
1701 | const Sized_relobj<size, big_endian>* object = relinfo->object; | |
1702 | elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
1703 | ||
1704 | // Get the GOT offset if needed. Unlike i386 and x86_64, our GOT | |
1705 | // pointer points to the beginning, not the end, of the table. | |
1706 | // So we just use the plain offset. | |
42cacb20 DE |
1707 | unsigned int got_offset = 0; |
1708 | unsigned int got2_offset = 0; | |
1709 | switch (r_type) | |
1710 | { | |
1711 | case elfcpp::R_PPC64_TOC16: | |
1712 | case elfcpp::R_PPC64_TOC16_LO: | |
1713 | case elfcpp::R_PPC64_TOC16_HI: | |
1714 | case elfcpp::R_PPC64_TOC16_HA: | |
1715 | case elfcpp::R_PPC64_TOC16_DS: | |
1716 | case elfcpp::R_PPC64_TOC16_LO_DS: | |
1717 | // Subtract the TOC base address. | |
1718 | addend -= target->toc_section()->address() + toc_base_offset; | |
1719 | /* FALLTHRU */ | |
1720 | ||
1721 | case elfcpp::R_POWERPC_GOT16: | |
1722 | case elfcpp::R_POWERPC_GOT16_LO: | |
1723 | case elfcpp::R_POWERPC_GOT16_HI: | |
1724 | case elfcpp::R_POWERPC_GOT16_HA: | |
1725 | case elfcpp::R_PPC64_GOT16_DS: | |
1726 | case elfcpp::R_PPC64_GOT16_LO_DS: | |
1727 | if (gsym != NULL) | |
1728 | { | |
1729 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
1730 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD); | |
1731 | } | |
1732 | else | |
1733 | { | |
1734 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
1735 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
1736 | got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1737 | } | |
42cacb20 DE |
1738 | break; |
1739 | ||
1740 | // R_PPC_PLTREL24 is rather special. If non-zero, | |
1741 | // the addend specifies the GOT pointer offset within .got2. | |
1742 | case elfcpp::R_PPC_PLTREL24: | |
1743 | if (addend >= 32768) | |
1744 | { | |
1745 | Output_data_space* got2; | |
1746 | got2 = target->got2_section(); | |
1747 | got2_offset = got2->offset(); | |
1748 | addend += got2_offset; | |
1749 | } | |
42cacb20 DE |
1750 | break; |
1751 | ||
1752 | default: | |
1753 | break; | |
1754 | } | |
1755 | ||
1756 | switch (r_type) | |
1757 | { | |
1758 | case elfcpp::R_POWERPC_NONE: | |
1759 | case elfcpp::R_POWERPC_GNU_VTINHERIT: | |
1760 | case elfcpp::R_POWERPC_GNU_VTENTRY: | |
1761 | break; | |
1762 | ||
1763 | case elfcpp::R_POWERPC_REL32: | |
1764 | Reloc::rel32(view, object, psymval, addend, address); | |
1765 | break; | |
1766 | ||
1767 | case elfcpp::R_POWERPC_REL24: | |
1768 | Reloc::rel24(view, object, psymval, addend, address); | |
1769 | break; | |
1770 | ||
1771 | case elfcpp::R_POWERPC_REL14: | |
1772 | Reloc::rel14(view, object, psymval, addend, address); | |
1773 | break; | |
1774 | ||
1775 | case elfcpp::R_PPC_PLTREL24: | |
1776 | Reloc::rel24(view, object, psymval, addend, address); | |
1777 | break; | |
1778 | ||
1779 | case elfcpp::R_PPC_LOCAL24PC: | |
1780 | Reloc::rel24(view, object, psymval, addend, address); | |
1781 | break; | |
1782 | ||
1783 | case elfcpp::R_PPC64_ADDR64: | |
1784 | if (!parameters->options().output_is_position_independent()) | |
1785 | Relocate_functions<size, big_endian>::rela64(view, object, | |
1786 | psymval, addend); | |
1787 | break; | |
1788 | ||
1789 | case elfcpp::R_POWERPC_ADDR32: | |
1790 | if (!parameters->options().output_is_position_independent()) | |
1791 | Relocate_functions<size, big_endian>::rela32(view, object, | |
1792 | psymval, addend); | |
1793 | break; | |
1794 | ||
1795 | case elfcpp::R_POWERPC_ADDR16_LO: | |
1796 | Reloc::addr16_lo(view, object, psymval, addend); | |
1797 | break; | |
1798 | ||
1799 | case elfcpp::R_POWERPC_ADDR16_HI: | |
1800 | Reloc::addr16_hi(view, object, psymval, addend); | |
1801 | break; | |
1802 | ||
1803 | case elfcpp::R_POWERPC_ADDR16_HA: | |
1804 | Reloc::addr16_ha(view, object, psymval, addend); | |
1805 | break; | |
1806 | ||
1807 | case elfcpp::R_PPC_REL16_LO: | |
1808 | Reloc::rel16_lo(view, object, psymval, addend, address); | |
1809 | break; | |
1810 | ||
1811 | case elfcpp::R_PPC_REL16_HI: | |
1812 | Reloc::rel16_lo(view, object, psymval, addend, address); | |
1813 | break; | |
1814 | ||
1815 | case elfcpp::R_PPC_REL16_HA: | |
83d22aa8 | 1816 | Reloc::rel16_ha(view, object, psymval, addend, address); |
42cacb20 DE |
1817 | break; |
1818 | ||
1819 | case elfcpp::R_POWERPC_GOT16: | |
1820 | Reloc::addr16(view, got_offset, addend); | |
1821 | break; | |
1822 | ||
1823 | case elfcpp::R_POWERPC_GOT16_LO: | |
1824 | Reloc::addr16_lo(view, got_offset, addend); | |
1825 | break; | |
1826 | ||
1827 | case elfcpp::R_POWERPC_GOT16_HI: | |
1828 | Reloc::addr16_hi(view, got_offset, addend); | |
1829 | break; | |
1830 | ||
1831 | case elfcpp::R_POWERPC_GOT16_HA: | |
1832 | Reloc::addr16_ha(view, got_offset, addend); | |
1833 | break; | |
1834 | ||
1835 | case elfcpp::R_PPC64_TOC16: | |
1836 | Reloc::addr16(view, got_offset, addend); | |
1837 | break; | |
1838 | ||
1839 | case elfcpp::R_PPC64_TOC16_LO: | |
1840 | Reloc::addr16_lo(view, got_offset, addend); | |
1841 | break; | |
1842 | ||
1843 | case elfcpp::R_PPC64_TOC16_HI: | |
1844 | Reloc::addr16_hi(view, got_offset, addend); | |
1845 | break; | |
1846 | ||
1847 | case elfcpp::R_PPC64_TOC16_HA: | |
1848 | Reloc::addr16_ha(view, got_offset, addend); | |
1849 | break; | |
1850 | ||
1851 | case elfcpp::R_PPC64_TOC16_DS: | |
1852 | case elfcpp::R_PPC64_TOC16_LO_DS: | |
1853 | Reloc::addr16_ds(view, got_offset, addend); | |
1854 | break; | |
1855 | ||
1856 | case elfcpp::R_PPC64_TOC: | |
1857 | { | |
1858 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1859 | value = target->toc_section()->address() + toc_base_offset; | |
1860 | Relocate_functions<64, false>::rela64(view, value, addend); | |
1861 | } | |
1862 | break; | |
1863 | ||
1864 | case elfcpp::R_POWERPC_COPY: | |
1865 | case elfcpp::R_POWERPC_GLOB_DAT: | |
1866 | case elfcpp::R_POWERPC_JMP_SLOT: | |
1867 | case elfcpp::R_POWERPC_RELATIVE: | |
1868 | // This is an outstanding tls reloc, which is unexpected when | |
1869 | // linking. | |
1870 | case elfcpp::R_POWERPC_DTPMOD: | |
1871 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
1872 | _("unexpected reloc %u in object file"), | |
1873 | r_type); | |
1874 | break; | |
1875 | ||
1876 | default: | |
1877 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
1878 | _("unsupported reloc %u"), | |
1879 | r_type); | |
1880 | break; | |
1881 | } | |
1882 | ||
1883 | return true; | |
1884 | } | |
1885 | ||
1886 | // Perform a TLS relocation. | |
1887 | ||
1888 | template<int size, bool big_endian> | |
1889 | inline void | |
1890 | Target_powerpc<size, big_endian>::Relocate::relocate_tls( | |
1891 | const Relocate_info<size, big_endian>* relinfo, | |
1892 | Target_powerpc<size, big_endian>* target, | |
1893 | size_t relnum, | |
1894 | const elfcpp::Rela<size, big_endian>& rela, | |
1895 | unsigned int r_type, | |
1896 | const Sized_symbol<size>* gsym, | |
1897 | const Symbol_value<size>* psymval, | |
1898 | unsigned char* view, | |
1899 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
1900 | section_size_type) | |
1901 | { | |
1902 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
1903 | typedef Powerpc_relocate_functions<size, big_endian> Reloc; | |
1904 | const Sized_relobj<size, big_endian>* object = relinfo->object; | |
1905 | ||
1906 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
1907 | typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(object, 0); | |
1908 | ||
1909 | const bool is_final = | |
1910 | (gsym == NULL | |
1911 | ? !parameters->options().output_is_position_independent() | |
1912 | : gsym->final_value_is_known()); | |
1913 | const tls::Tls_optimization optimized_type | |
1914 | = optimize_tls_reloc(is_final, r_type); | |
1915 | ||
1916 | switch (r_type) | |
1917 | { | |
1918 | // XXX | |
1919 | } | |
1920 | } | |
1921 | ||
1922 | // Relocate section data. | |
1923 | ||
1924 | template<int size, bool big_endian> | |
1925 | void | |
1926 | Target_powerpc<size, big_endian>::relocate_section( | |
1927 | const Relocate_info<size, big_endian>* relinfo, | |
1928 | unsigned int sh_type, | |
1929 | const unsigned char* prelocs, | |
1930 | size_t reloc_count, | |
1931 | Output_section* output_section, | |
1932 | bool needs_special_offset_handling, | |
1933 | unsigned char* view, | |
1934 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
364c7fa5 ILT |
1935 | section_size_type view_size, |
1936 | const Reloc_symbol_changes* reloc_symbol_changes) | |
42cacb20 DE |
1937 | { |
1938 | typedef Target_powerpc<size, big_endian> Powerpc; | |
1939 | typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate; | |
1940 | ||
1941 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
1942 | ||
1943 | gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA, | |
1944 | Powerpc_relocate>( | |
1945 | relinfo, | |
1946 | this, | |
1947 | prelocs, | |
1948 | reloc_count, | |
1949 | output_section, | |
1950 | needs_special_offset_handling, | |
1951 | view, | |
1952 | address, | |
364c7fa5 ILT |
1953 | view_size, |
1954 | reloc_symbol_changes); | |
42cacb20 DE |
1955 | } |
1956 | ||
1957 | // Return the size of a relocation while scanning during a relocatable | |
1958 | // link. | |
1959 | ||
1960 | template<int size, bool big_endian> | |
1961 | unsigned int | |
1962 | Target_powerpc<size, big_endian>::Relocatable_size_for_reloc::get_size_for_reloc( | |
1963 | unsigned int, | |
1964 | Relobj*) | |
1965 | { | |
1966 | // We are always SHT_RELA, so we should never get here. | |
1967 | gold_unreachable(); | |
1968 | return 0; | |
1969 | } | |
1970 | ||
1971 | // Scan the relocs during a relocatable link. | |
1972 | ||
1973 | template<int size, bool big_endian> | |
1974 | void | |
1975 | Target_powerpc<size, big_endian>::scan_relocatable_relocs( | |
42cacb20 DE |
1976 | Symbol_table* symtab, |
1977 | Layout* layout, | |
1978 | Sized_relobj<size, big_endian>* object, | |
1979 | unsigned int data_shndx, | |
1980 | unsigned int sh_type, | |
1981 | const unsigned char* prelocs, | |
1982 | size_t reloc_count, | |
1983 | Output_section* output_section, | |
1984 | bool needs_special_offset_handling, | |
1985 | size_t local_symbol_count, | |
1986 | const unsigned char* plocal_symbols, | |
1987 | Relocatable_relocs* rr) | |
1988 | { | |
1989 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
1990 | ||
1991 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
1992 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
1993 | ||
1994 | gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA, | |
1995 | Scan_relocatable_relocs>( | |
42cacb20 DE |
1996 | symtab, |
1997 | layout, | |
1998 | object, | |
1999 | data_shndx, | |
2000 | prelocs, | |
2001 | reloc_count, | |
2002 | output_section, | |
2003 | needs_special_offset_handling, | |
2004 | local_symbol_count, | |
2005 | plocal_symbols, | |
2006 | rr); | |
2007 | } | |
2008 | ||
2009 | // Relocate a section during a relocatable link. | |
2010 | ||
2011 | template<int size, bool big_endian> | |
2012 | void | |
2013 | Target_powerpc<size, big_endian>::relocate_for_relocatable( | |
2014 | const Relocate_info<size, big_endian>* relinfo, | |
2015 | unsigned int sh_type, | |
2016 | const unsigned char* prelocs, | |
2017 | size_t reloc_count, | |
2018 | Output_section* output_section, | |
2019 | off_t offset_in_output_section, | |
2020 | const Relocatable_relocs* rr, | |
2021 | unsigned char* view, | |
2022 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
2023 | section_size_type view_size, | |
2024 | unsigned char* reloc_view, | |
2025 | section_size_type reloc_view_size) | |
2026 | { | |
2027 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2028 | ||
2029 | gold::relocate_for_relocatable<size, big_endian, elfcpp::SHT_RELA>( | |
2030 | relinfo, | |
2031 | prelocs, | |
2032 | reloc_count, | |
2033 | output_section, | |
2034 | offset_in_output_section, | |
2035 | rr, | |
2036 | view, | |
2037 | view_address, | |
2038 | view_size, | |
2039 | reloc_view, | |
2040 | reloc_view_size); | |
2041 | } | |
2042 | ||
2043 | // Return the value to use for a dynamic which requires special | |
2044 | // treatment. This is how we support equality comparisons of function | |
2045 | // pointers across shared library boundaries, as described in the | |
2046 | // processor specific ABI supplement. | |
2047 | ||
2048 | template<int size, bool big_endian> | |
2049 | uint64_t | |
2050 | Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const | |
2051 | { | |
2052 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2053 | return this->plt_section()->address() + gsym->plt_offset(); | |
2054 | } | |
2055 | ||
2056 | // The selector for powerpc object files. | |
2057 | ||
2058 | template<int size, bool big_endian> | |
2059 | class Target_selector_powerpc : public Target_selector | |
2060 | { | |
2061 | public: | |
2062 | Target_selector_powerpc() | |
2063 | : Target_selector(elfcpp::EM_NONE, size, big_endian, | |
2064 | (size == 64 ? | |
2065 | (big_endian ? "elf64-powerpc" : "elf64-powerpcle") : | |
2066 | (big_endian ? "elf32-powerpc" : "elf32-powerpcle"))) | |
2067 | { } | |
2068 | ||
2ea97941 | 2069 | Target* do_recognize(int machine, int, int) |
42cacb20 DE |
2070 | { |
2071 | switch (size) | |
2072 | { | |
2073 | case 64: | |
2ea97941 | 2074 | if (machine != elfcpp::EM_PPC64) |
42cacb20 DE |
2075 | return NULL; |
2076 | break; | |
2077 | ||
2078 | case 32: | |
2ea97941 | 2079 | if (machine != elfcpp::EM_PPC) |
42cacb20 DE |
2080 | return NULL; |
2081 | break; | |
2082 | ||
2083 | default: | |
2084 | return NULL; | |
2085 | } | |
2086 | ||
7f055c20 | 2087 | return this->instantiate_target(); |
42cacb20 DE |
2088 | } |
2089 | ||
2090 | Target* do_instantiate_target() | |
7f055c20 | 2091 | { return new Target_powerpc<size, big_endian>(); } |
42cacb20 DE |
2092 | }; |
2093 | ||
2094 | Target_selector_powerpc<32, true> target_selector_ppc32; | |
2095 | Target_selector_powerpc<32, false> target_selector_ppc32le; | |
2096 | Target_selector_powerpc<64, true> target_selector_ppc64; | |
2097 | Target_selector_powerpc<64, false> target_selector_ppc64le; | |
2098 | ||
2099 | } // End anonymous namespace. |