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1 | // mips.cc -- mips target support for gold. |
2 | ||
3 | // Copyright (C) 2011-2014 Free Software Foundation, Inc. | |
4 | // Written by Sasa Stankovic <sasa.stankovic@imgtec.com> | |
5 | // and Aleksandar Simeonov <aleksandar.simeonov@rt-rk.com>. | |
6 | // This file contains borrowed and adapted code from bfd/elfxx-mips.c. | |
7 | ||
8 | // This file is part of gold. | |
9 | ||
10 | // This program is free software; you can redistribute it and/or modify | |
11 | // it under the terms of the GNU General Public License as published by | |
12 | // the Free Software Foundation; either version 3 of the License, or | |
13 | // (at your option) any later version. | |
14 | ||
15 | // This program is distributed in the hope that it will be useful, | |
16 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | // GNU General Public License for more details. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License | |
21 | // along with this program; if not, write to the Free Software | |
22 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
23 | // MA 02110-1301, USA. | |
24 | ||
25 | #include "gold.h" | |
26 | ||
27 | #include <algorithm> | |
28 | #include <set> | |
29 | #include <sstream> | |
30 | #include "demangle.h" | |
31 | ||
32 | #include "elfcpp.h" | |
33 | #include "parameters.h" | |
34 | #include "reloc.h" | |
35 | #include "mips.h" | |
36 | #include "object.h" | |
37 | #include "symtab.h" | |
38 | #include "layout.h" | |
39 | #include "output.h" | |
40 | #include "copy-relocs.h" | |
41 | #include "target.h" | |
42 | #include "target-reloc.h" | |
43 | #include "target-select.h" | |
44 | #include "tls.h" | |
45 | #include "errors.h" | |
46 | #include "gc.h" | |
47 | ||
48 | namespace | |
49 | { | |
50 | using namespace gold; | |
51 | ||
52 | template<int size, bool big_endian> | |
53 | class Mips_output_data_plt; | |
54 | ||
55 | template<int size, bool big_endian> | |
56 | class Mips_output_data_got; | |
57 | ||
58 | template<int size, bool big_endian> | |
59 | class Target_mips; | |
60 | ||
61 | template<int size, bool big_endian> | |
62 | class Mips_output_section_reginfo; | |
63 | ||
64 | template<int size, bool big_endian> | |
65 | class Mips_output_data_la25_stub; | |
66 | ||
67 | template<int size, bool big_endian> | |
68 | class Mips_output_data_mips_stubs; | |
69 | ||
70 | template<int size> | |
71 | class Mips_symbol; | |
72 | ||
73 | template<int size, bool big_endian> | |
74 | class Mips_got_info; | |
75 | ||
76 | template<int size, bool big_endian> | |
77 | class Mips_relobj; | |
78 | ||
79 | class Mips16_stub_section_base; | |
80 | ||
81 | template<int size, bool big_endian> | |
82 | class Mips16_stub_section; | |
83 | ||
84 | // The ABI says that every symbol used by dynamic relocations must have | |
85 | // a global GOT entry. Among other things, this provides the dynamic | |
86 | // linker with a free, directly-indexed cache. The GOT can therefore | |
87 | // contain symbols that are not referenced by GOT relocations themselves | |
88 | // (in other words, it may have symbols that are not referenced by things | |
89 | // like R_MIPS_GOT16 and R_MIPS_GOT_PAGE). | |
90 | ||
91 | // GOT relocations are less likely to overflow if we put the associated | |
92 | // GOT entries towards the beginning. We therefore divide the global | |
93 | // GOT entries into two areas: "normal" and "reloc-only". Entries in | |
94 | // the first area can be used for both dynamic relocations and GP-relative | |
95 | // accesses, while those in the "reloc-only" area are for dynamic | |
96 | // relocations only. | |
97 | ||
98 | // These GGA_* ("Global GOT Area") values are organised so that lower | |
99 | // values are more general than higher values. Also, non-GGA_NONE | |
100 | // values are ordered by the position of the area in the GOT. | |
101 | ||
102 | enum Global_got_area | |
103 | { | |
104 | GGA_NORMAL = 0, | |
105 | GGA_RELOC_ONLY = 1, | |
106 | GGA_NONE = 2 | |
107 | }; | |
108 | ||
109 | // The types of GOT entries needed for this platform. | |
110 | // These values are exposed to the ABI in an incremental link. | |
111 | // Do not renumber existing values without changing the version | |
112 | // number of the .gnu_incremental_inputs section. | |
113 | enum Got_type | |
114 | { | |
115 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
116 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
117 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
118 | ||
119 | // GOT entries for multi-GOT. We support up to 1024 GOTs in multi-GOT links. | |
120 | GOT_TYPE_STANDARD_MULTIGOT = 3, | |
121 | GOT_TYPE_TLS_OFFSET_MULTIGOT = GOT_TYPE_STANDARD_MULTIGOT + 1024, | |
122 | GOT_TYPE_TLS_PAIR_MULTIGOT = GOT_TYPE_TLS_OFFSET_MULTIGOT + 1024 | |
123 | }; | |
124 | ||
125 | // TLS type of GOT entry. | |
126 | enum Got_tls_type | |
127 | { | |
128 | GOT_TLS_NONE = 0, | |
129 | GOT_TLS_GD = 1, | |
130 | GOT_TLS_LDM = 2, | |
131 | GOT_TLS_IE = 4 | |
132 | }; | |
133 | ||
134 | // Return TRUE if a relocation of type R_TYPE from OBJECT might | |
135 | // require an la25 stub. See also local_pic_function, which determines | |
136 | // whether the destination function ever requires a stub. | |
137 | template<int size, bool big_endian> | |
138 | static inline bool | |
139 | relocation_needs_la25_stub(Mips_relobj<size, big_endian>* object, | |
140 | unsigned int r_type, bool target_is_16_bit_code) | |
141 | { | |
142 | // We specifically ignore branches and jumps from EF_PIC objects, | |
143 | // where the onus is on the compiler or programmer to perform any | |
144 | // necessary initialization of $25. Sometimes such initialization | |
145 | // is unnecessary; for example, -mno-shared functions do not use | |
146 | // the incoming value of $25, and may therefore be called directly. | |
147 | if (object->is_pic()) | |
148 | return false; | |
149 | ||
150 | switch (r_type) | |
151 | { | |
152 | case elfcpp::R_MIPS_26: | |
153 | case elfcpp::R_MIPS_PC16: | |
154 | case elfcpp::R_MICROMIPS_26_S1: | |
155 | case elfcpp::R_MICROMIPS_PC7_S1: | |
156 | case elfcpp::R_MICROMIPS_PC10_S1: | |
157 | case elfcpp::R_MICROMIPS_PC16_S1: | |
158 | case elfcpp::R_MICROMIPS_PC23_S2: | |
159 | return true; | |
160 | ||
161 | case elfcpp::R_MIPS16_26: | |
162 | return !target_is_16_bit_code; | |
163 | ||
164 | default: | |
165 | return false; | |
166 | } | |
167 | } | |
168 | ||
169 | // Return true if SYM is a locally-defined PIC function, in the sense | |
170 | // that it or its fn_stub might need $25 to be valid on entry. | |
171 | // Note that MIPS16 functions set up $gp using PC-relative instructions, | |
172 | // so they themselves never need $25 to be valid. Only non-MIPS16 | |
173 | // entry points are of interest here. | |
174 | template<int size, bool big_endian> | |
175 | static inline bool | |
176 | local_pic_function(Mips_symbol<size>* sym) | |
177 | { | |
178 | bool def_regular = (sym->source() == Symbol::FROM_OBJECT | |
179 | && !sym->object()->is_dynamic() | |
180 | && !sym->is_undefined()); | |
181 | ||
182 | if (sym->is_defined() && def_regular) | |
183 | { | |
184 | Mips_relobj<size, big_endian>* object = | |
185 | static_cast<Mips_relobj<size, big_endian>*>(sym->object()); | |
186 | ||
187 | if ((object->is_pic() || sym->is_pic()) | |
188 | && (!sym->is_mips16() | |
189 | || (sym->has_mips16_fn_stub() && sym->need_fn_stub()))) | |
190 | return true; | |
191 | } | |
192 | return false; | |
193 | } | |
194 | ||
195 | static inline bool | |
196 | hi16_reloc(int r_type) | |
197 | { | |
198 | return (r_type == elfcpp::R_MIPS_HI16 | |
199 | || r_type == elfcpp::R_MIPS16_HI16 | |
200 | || r_type == elfcpp::R_MICROMIPS_HI16); | |
201 | } | |
202 | ||
203 | static inline bool | |
204 | lo16_reloc(int r_type) | |
205 | { | |
206 | return (r_type == elfcpp::R_MIPS_LO16 | |
207 | || r_type == elfcpp::R_MIPS16_LO16 | |
208 | || r_type == elfcpp::R_MICROMIPS_LO16); | |
209 | } | |
210 | ||
211 | static inline bool | |
212 | got16_reloc(unsigned int r_type) | |
213 | { | |
214 | return (r_type == elfcpp::R_MIPS_GOT16 | |
215 | || r_type == elfcpp::R_MIPS16_GOT16 | |
216 | || r_type == elfcpp::R_MICROMIPS_GOT16); | |
217 | } | |
218 | ||
219 | static inline bool | |
220 | call_lo16_reloc(unsigned int r_type) | |
221 | { | |
222 | return (r_type == elfcpp::R_MIPS_CALL_LO16 | |
223 | || r_type == elfcpp::R_MICROMIPS_CALL_LO16); | |
224 | } | |
225 | ||
226 | static inline bool | |
227 | got_lo16_reloc(unsigned int r_type) | |
228 | { | |
229 | return (r_type == elfcpp::R_MIPS_GOT_LO16 | |
230 | || r_type == elfcpp::R_MICROMIPS_GOT_LO16); | |
231 | } | |
232 | ||
233 | static inline bool | |
234 | got_disp_reloc(unsigned int r_type) | |
235 | { | |
236 | return (r_type == elfcpp::R_MIPS_GOT_DISP | |
237 | || r_type == elfcpp::R_MICROMIPS_GOT_DISP); | |
238 | } | |
239 | ||
240 | static inline bool | |
241 | got_page_reloc(unsigned int r_type) | |
242 | { | |
243 | return (r_type == elfcpp::R_MIPS_GOT_PAGE | |
244 | || r_type == elfcpp::R_MICROMIPS_GOT_PAGE); | |
245 | } | |
246 | ||
247 | static inline bool | |
248 | tls_gd_reloc(unsigned int r_type) | |
249 | { | |
250 | return (r_type == elfcpp::R_MIPS_TLS_GD | |
251 | || r_type == elfcpp::R_MIPS16_TLS_GD | |
252 | || r_type == elfcpp::R_MICROMIPS_TLS_GD); | |
253 | } | |
254 | ||
255 | static inline bool | |
256 | tls_gottprel_reloc(unsigned int r_type) | |
257 | { | |
258 | return (r_type == elfcpp::R_MIPS_TLS_GOTTPREL | |
259 | || r_type == elfcpp::R_MIPS16_TLS_GOTTPREL | |
260 | || r_type == elfcpp::R_MICROMIPS_TLS_GOTTPREL); | |
261 | } | |
262 | ||
263 | static inline bool | |
264 | tls_ldm_reloc(unsigned int r_type) | |
265 | { | |
266 | return (r_type == elfcpp::R_MIPS_TLS_LDM | |
267 | || r_type == elfcpp::R_MIPS16_TLS_LDM | |
268 | || r_type == elfcpp::R_MICROMIPS_TLS_LDM); | |
269 | } | |
270 | ||
271 | static inline bool | |
272 | mips16_call_reloc(unsigned int r_type) | |
273 | { | |
274 | return (r_type == elfcpp::R_MIPS16_26 | |
275 | || r_type == elfcpp::R_MIPS16_CALL16); | |
276 | } | |
277 | ||
278 | static inline bool | |
279 | jal_reloc(unsigned int r_type) | |
280 | { | |
281 | return (r_type == elfcpp::R_MIPS_26 | |
282 | || r_type == elfcpp::R_MIPS16_26 | |
283 | || r_type == elfcpp::R_MICROMIPS_26_S1); | |
284 | } | |
285 | ||
286 | static inline bool | |
287 | micromips_branch_reloc(unsigned int r_type) | |
288 | { | |
289 | return (r_type == elfcpp::R_MICROMIPS_26_S1 | |
290 | || r_type == elfcpp::R_MICROMIPS_PC16_S1 | |
291 | || r_type == elfcpp::R_MICROMIPS_PC10_S1 | |
292 | || r_type == elfcpp::R_MICROMIPS_PC7_S1); | |
293 | } | |
294 | ||
295 | // Check if R_TYPE is a MIPS16 reloc. | |
296 | static inline bool | |
297 | mips16_reloc(unsigned int r_type) | |
298 | { | |
299 | switch (r_type) | |
300 | { | |
301 | case elfcpp::R_MIPS16_26: | |
302 | case elfcpp::R_MIPS16_GPREL: | |
303 | case elfcpp::R_MIPS16_GOT16: | |
304 | case elfcpp::R_MIPS16_CALL16: | |
305 | case elfcpp::R_MIPS16_HI16: | |
306 | case elfcpp::R_MIPS16_LO16: | |
307 | case elfcpp::R_MIPS16_TLS_GD: | |
308 | case elfcpp::R_MIPS16_TLS_LDM: | |
309 | case elfcpp::R_MIPS16_TLS_DTPREL_HI16: | |
310 | case elfcpp::R_MIPS16_TLS_DTPREL_LO16: | |
311 | case elfcpp::R_MIPS16_TLS_GOTTPREL: | |
312 | case elfcpp::R_MIPS16_TLS_TPREL_HI16: | |
313 | case elfcpp::R_MIPS16_TLS_TPREL_LO16: | |
314 | return true; | |
315 | ||
316 | default: | |
317 | return false; | |
318 | } | |
319 | } | |
320 | ||
321 | // Check if R_TYPE is a microMIPS reloc. | |
322 | static inline bool | |
323 | micromips_reloc(unsigned int r_type) | |
324 | { | |
325 | switch (r_type) | |
326 | { | |
327 | case elfcpp::R_MICROMIPS_26_S1: | |
328 | case elfcpp::R_MICROMIPS_HI16: | |
329 | case elfcpp::R_MICROMIPS_LO16: | |
330 | case elfcpp::R_MICROMIPS_GPREL16: | |
331 | case elfcpp::R_MICROMIPS_LITERAL: | |
332 | case elfcpp::R_MICROMIPS_GOT16: | |
333 | case elfcpp::R_MICROMIPS_PC7_S1: | |
334 | case elfcpp::R_MICROMIPS_PC10_S1: | |
335 | case elfcpp::R_MICROMIPS_PC16_S1: | |
336 | case elfcpp::R_MICROMIPS_CALL16: | |
337 | case elfcpp::R_MICROMIPS_GOT_DISP: | |
338 | case elfcpp::R_MICROMIPS_GOT_PAGE: | |
339 | case elfcpp::R_MICROMIPS_GOT_OFST: | |
340 | case elfcpp::R_MICROMIPS_GOT_HI16: | |
341 | case elfcpp::R_MICROMIPS_GOT_LO16: | |
342 | case elfcpp::R_MICROMIPS_SUB: | |
343 | case elfcpp::R_MICROMIPS_HIGHER: | |
344 | case elfcpp::R_MICROMIPS_HIGHEST: | |
345 | case elfcpp::R_MICROMIPS_CALL_HI16: | |
346 | case elfcpp::R_MICROMIPS_CALL_LO16: | |
347 | case elfcpp::R_MICROMIPS_SCN_DISP: | |
348 | case elfcpp::R_MICROMIPS_JALR: | |
349 | case elfcpp::R_MICROMIPS_HI0_LO16: | |
350 | case elfcpp::R_MICROMIPS_TLS_GD: | |
351 | case elfcpp::R_MICROMIPS_TLS_LDM: | |
352 | case elfcpp::R_MICROMIPS_TLS_DTPREL_HI16: | |
353 | case elfcpp::R_MICROMIPS_TLS_DTPREL_LO16: | |
354 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: | |
355 | case elfcpp::R_MICROMIPS_TLS_TPREL_HI16: | |
356 | case elfcpp::R_MICROMIPS_TLS_TPREL_LO16: | |
357 | case elfcpp::R_MICROMIPS_GPREL7_S2: | |
358 | case elfcpp::R_MICROMIPS_PC23_S2: | |
359 | return true; | |
360 | ||
361 | default: | |
362 | return false; | |
363 | } | |
364 | } | |
365 | ||
366 | static inline bool | |
367 | is_matching_lo16_reloc(unsigned int high_reloc, unsigned int lo16_reloc) | |
368 | { | |
369 | switch (high_reloc) | |
370 | { | |
371 | case elfcpp::R_MIPS_HI16: | |
372 | case elfcpp::R_MIPS_GOT16: | |
373 | return lo16_reloc == elfcpp::R_MIPS_LO16; | |
374 | case elfcpp::R_MIPS16_HI16: | |
375 | case elfcpp::R_MIPS16_GOT16: | |
376 | return lo16_reloc == elfcpp::R_MIPS16_LO16; | |
377 | case elfcpp::R_MICROMIPS_HI16: | |
378 | case elfcpp::R_MICROMIPS_GOT16: | |
379 | return lo16_reloc == elfcpp::R_MICROMIPS_LO16; | |
380 | default: | |
381 | return false; | |
382 | } | |
383 | } | |
384 | ||
385 | // This class is used to hold information about one GOT entry. | |
386 | // There are three types of entry: | |
387 | // | |
388 | // (1) a SYMBOL + OFFSET address, where SYMBOL is local to an input object | |
389 | // (object != NULL, symndx >= 0, tls_type != GOT_TLS_LDM) | |
390 | // (2) a SYMBOL address, where SYMBOL is not local to an input object | |
391 | // (object != NULL, symndx == -1) | |
392 | // (3) a TLS LDM slot | |
393 | // (object != NULL, symndx == 0, tls_type == GOT_TLS_LDM) | |
394 | ||
395 | template<int size, bool big_endian> | |
396 | class Mips_got_entry | |
397 | { | |
398 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
399 | ||
400 | public: | |
401 | Mips_got_entry(Mips_relobj<size, big_endian>* object, unsigned int symndx, | |
402 | Mips_address addend, unsigned char tls_type, | |
403 | unsigned int shndx) | |
404 | : object_(object), symndx_(symndx), tls_type_(tls_type), shndx_(shndx) | |
405 | { this->d.addend = addend; } | |
406 | ||
407 | Mips_got_entry(Mips_relobj<size, big_endian>* object, Mips_symbol<size>* sym, | |
408 | unsigned char tls_type) | |
409 | : object_(object), symndx_(-1U), tls_type_(tls_type), shndx_(-1U) | |
410 | { this->d.sym = sym; } | |
411 | ||
412 | // Return whether this entry is for a local symbol. | |
413 | bool | |
414 | is_for_local_symbol() const | |
415 | { return this->symndx_ != -1U; } | |
416 | ||
417 | // Return whether this entry is for a global symbol. | |
418 | bool | |
419 | is_for_global_symbol() const | |
420 | { return this->symndx_ == -1U; } | |
421 | ||
422 | // Return the hash of this entry. | |
423 | size_t | |
424 | hash() const | |
425 | { | |
426 | if (this->tls_type_ == GOT_TLS_LDM) | |
427 | return this->symndx_ + (1 << 18); | |
428 | if (this->symndx_ != -1U) | |
429 | { | |
430 | uintptr_t object_id = reinterpret_cast<uintptr_t>(this->object()); | |
431 | return this->symndx_ + object_id + this->d.addend; | |
432 | } | |
433 | else | |
434 | { | |
435 | uintptr_t sym_id = reinterpret_cast<uintptr_t>(this->d.sym); | |
436 | return this->symndx_ + sym_id; | |
437 | } | |
438 | } | |
439 | ||
440 | // Return whether this entry is equal to OTHER. | |
441 | bool | |
442 | equals(Mips_got_entry<size, big_endian>* other) const | |
443 | { | |
444 | if (this->symndx_ != other->symndx_ | |
445 | || this->tls_type_ != other->tls_type_) | |
446 | return false; | |
447 | if (this->tls_type_ == GOT_TLS_LDM) | |
448 | return true; | |
449 | if (this->symndx_ != -1U) | |
450 | return (this->object() == other->object() | |
451 | && this->d.addend == other->d.addend); | |
452 | else | |
453 | return this->d.sym == other->d.sym; | |
454 | } | |
455 | ||
456 | // Return input object that needs this GOT entry. | |
457 | Mips_relobj<size, big_endian>* | |
458 | object() const | |
459 | { | |
460 | gold_assert(this->object_ != NULL); | |
461 | return this->object_; | |
462 | } | |
463 | ||
464 | // Return local symbol index for local GOT entries. | |
465 | unsigned int | |
466 | symndx() const | |
467 | { | |
468 | gold_assert(this->symndx_ != -1U); | |
469 | return this->symndx_; | |
470 | } | |
471 | ||
472 | // Return the relocation addend for local GOT entries. | |
473 | Mips_address | |
474 | addend() const | |
475 | { | |
476 | gold_assert(this->symndx_ != -1U); | |
477 | return this->d.addend; | |
478 | } | |
479 | ||
480 | // Return global symbol for global GOT entries. | |
481 | Mips_symbol<size>* | |
482 | sym() const | |
483 | { | |
484 | gold_assert(this->symndx_ == -1U); | |
485 | return this->d.sym; | |
486 | } | |
487 | ||
488 | // Return whether this is a TLS GOT entry. | |
489 | bool | |
490 | is_tls_entry() const | |
491 | { return this->tls_type_ != GOT_TLS_NONE; } | |
492 | ||
493 | // Return TLS type of this GOT entry. | |
494 | unsigned char | |
495 | tls_type() const | |
496 | { return this->tls_type_; } | |
497 | ||
498 | // Return section index of the local symbol for local GOT entries. | |
499 | unsigned int | |
500 | shndx() const | |
501 | { return this->shndx_; } | |
502 | ||
503 | private: | |
504 | // The input object that needs the GOT entry. | |
505 | Mips_relobj<size, big_endian>* object_; | |
506 | // The index of the symbol if we have a local symbol; -1 otherwise. | |
507 | unsigned int symndx_; | |
508 | ||
509 | union | |
510 | { | |
511 | // If symndx != -1, the addend of the relocation that should be added to the | |
512 | // symbol value. | |
513 | Mips_address addend; | |
514 | // If symndx == -1, the global symbol corresponding to this GOT entry. The | |
515 | // symbol's entry is in the local area if mips_sym->global_got_area is | |
516 | // GGA_NONE, otherwise it is in the global area. | |
517 | Mips_symbol<size>* sym; | |
518 | } d; | |
519 | ||
520 | // The TLS type of this GOT entry. An LDM GOT entry will be a local | |
521 | // symbol entry with r_symndx == 0. | |
522 | unsigned char tls_type_; | |
523 | ||
524 | // For local GOT entries, section index of the local symbol. | |
525 | unsigned int shndx_; | |
526 | }; | |
527 | ||
528 | // Hash for Mips_got_entry. | |
529 | ||
530 | template<int size, bool big_endian> | |
531 | class Mips_got_entry_hash | |
532 | { | |
533 | public: | |
534 | size_t | |
535 | operator()(Mips_got_entry<size, big_endian>* entry) const | |
536 | { return entry->hash(); } | |
537 | }; | |
538 | ||
539 | // Equality for Mips_got_entry. | |
540 | ||
541 | template<int size, bool big_endian> | |
542 | class Mips_got_entry_eq | |
543 | { | |
544 | public: | |
545 | bool | |
546 | operator()(Mips_got_entry<size, big_endian>* e1, | |
547 | Mips_got_entry<size, big_endian>* e2) const | |
548 | { return e1->equals(e2); } | |
549 | }; | |
550 | ||
551 | // Got_page_range. This class describes a range of addends: [MIN_ADDEND, | |
552 | // MAX_ADDEND]. The instances form a non-overlapping list that is sorted by | |
553 | // increasing MIN_ADDEND. | |
554 | ||
555 | struct Got_page_range | |
556 | { | |
557 | Got_page_range() | |
558 | : next(NULL), min_addend(0), max_addend(0) | |
559 | { } | |
560 | ||
561 | Got_page_range* next; | |
562 | int min_addend; | |
563 | int max_addend; | |
564 | ||
565 | // Return the maximum number of GOT page entries required. | |
566 | int | |
567 | get_max_pages() | |
568 | { return (this->max_addend - this->min_addend + 0x1ffff) >> 16; } | |
569 | }; | |
570 | ||
571 | // Got_page_entry. This class describes the range of addends that are applied | |
572 | // to page relocations against a given symbol. | |
573 | ||
574 | struct Got_page_entry | |
575 | { | |
576 | Got_page_entry() | |
577 | : object(NULL), symndx(-1U), ranges(NULL), num_pages(0) | |
578 | { } | |
579 | ||
580 | Got_page_entry(Object* object_, unsigned int symndx_) | |
581 | : object(object_), symndx(symndx_), ranges(NULL), num_pages(0) | |
582 | { } | |
583 | ||
584 | // The input object that needs the GOT page entry. | |
585 | Object* object; | |
586 | // The index of the symbol, as stored in the relocation r_info. | |
587 | unsigned int symndx; | |
588 | // The ranges for this page entry. | |
589 | Got_page_range* ranges; | |
590 | // The maximum number of page entries needed for RANGES. | |
591 | unsigned int num_pages; | |
592 | }; | |
593 | ||
594 | // Hash for Got_page_entry. | |
595 | ||
596 | struct Got_page_entry_hash | |
597 | { | |
598 | size_t | |
599 | operator()(Got_page_entry* entry) const | |
600 | { return reinterpret_cast<uintptr_t>(entry->object) + entry->symndx; } | |
601 | }; | |
602 | ||
603 | // Equality for Got_page_entry. | |
604 | ||
605 | struct Got_page_entry_eq | |
606 | { | |
607 | bool | |
608 | operator()(Got_page_entry* entry1, Got_page_entry* entry2) const | |
609 | { | |
610 | return entry1->object == entry2->object && entry1->symndx == entry2->symndx; | |
611 | } | |
612 | }; | |
613 | ||
614 | // This class is used to hold .got information when linking. | |
615 | ||
616 | template<int size, bool big_endian> | |
617 | class Mips_got_info | |
618 | { | |
619 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
620 | typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> | |
621 | Reloc_section; | |
622 | typedef Unordered_map<unsigned int, unsigned int> Got_page_offsets; | |
623 | ||
624 | // Unordered set of GOT entries. | |
625 | typedef Unordered_set<Mips_got_entry<size, big_endian>*, | |
626 | Mips_got_entry_hash<size, big_endian>, | |
627 | Mips_got_entry_eq<size, big_endian> > Got_entry_set; | |
628 | ||
629 | // Unordered set of GOT page entries. | |
630 | typedef Unordered_set<Got_page_entry*, | |
631 | Got_page_entry_hash, Got_page_entry_eq> Got_page_entry_set; | |
632 | ||
633 | public: | |
634 | Mips_got_info() | |
635 | : local_gotno_(0), page_gotno_(0), global_gotno_(0), reloc_only_gotno_(0), | |
636 | tls_gotno_(0), tls_ldm_offset_(-1U), global_got_symbols_(), | |
637 | got_entries_(), got_page_entries_(), got_page_offset_start_(0), | |
638 | got_page_offset_next_(0), got_page_offsets_(), next_(NULL), index_(-1U), | |
639 | offset_(0) | |
640 | { } | |
641 | ||
642 | // Reserve GOT entry for a GOT relocation of type R_TYPE against symbol | |
643 | // SYMNDX + ADDEND, where SYMNDX is a local symbol in section SHNDX in OBJECT. | |
644 | void | |
645 | record_local_got_symbol(Mips_relobj<size, big_endian>* object, | |
646 | unsigned int symndx, Mips_address addend, | |
647 | unsigned int r_type, unsigned int shndx); | |
648 | ||
649 | // Reserve GOT entry for a GOT relocation of type R_TYPE against MIPS_SYM, | |
650 | // in OBJECT. FOR_CALL is true if the caller is only interested in | |
651 | // using the GOT entry for calls. DYN_RELOC is true if R_TYPE is a dynamic | |
652 | // relocation. | |
653 | void | |
654 | record_global_got_symbol(Mips_symbol<size>* mips_sym, | |
655 | Mips_relobj<size, big_endian>* object, | |
656 | unsigned int r_type, bool dyn_reloc, bool for_call); | |
657 | ||
658 | // Add ENTRY to master GOT and to OBJECT's GOT. | |
659 | void | |
660 | record_got_entry(Mips_got_entry<size, big_endian>* entry, | |
661 | Mips_relobj<size, big_endian>* object); | |
662 | ||
663 | // Record that OBJECT has a page relocation against symbol SYMNDX and | |
664 | // that ADDEND is the addend for that relocation. | |
665 | void | |
666 | record_got_page_entry(Mips_relobj<size, big_endian>* object, | |
667 | unsigned int symndx, int addend); | |
668 | ||
669 | // Create all entries that should be in the local part of the GOT. | |
670 | void | |
671 | add_local_entries(Target_mips<size, big_endian>* target, Layout* layout); | |
672 | ||
673 | // Create GOT page entries. | |
674 | void | |
675 | add_page_entries(Target_mips<size, big_endian>* target, Layout* layout); | |
676 | ||
677 | // Create global GOT entries, both GGA_NORMAL and GGA_RELOC_ONLY. | |
678 | void | |
679 | add_global_entries(Target_mips<size, big_endian>* target, Layout* layout, | |
680 | unsigned int non_reloc_only_global_gotno); | |
681 | ||
682 | // Create global GOT entries that should be in the GGA_RELOC_ONLY area. | |
683 | void | |
684 | add_reloc_only_entries(Mips_output_data_got<size, big_endian>* got); | |
685 | ||
686 | // Create TLS GOT entries. | |
687 | void | |
688 | add_tls_entries(Target_mips<size, big_endian>* target, Layout* layout); | |
689 | ||
690 | // Decide whether the symbol needs an entry in the global part of the primary | |
691 | // GOT, setting global_got_area accordingly. Count the number of global | |
692 | // symbols that are in the primary GOT only because they have dynamic | |
693 | // relocations R_MIPS_REL32 against them (reloc_only_gotno). | |
694 | void | |
695 | count_got_symbols(Symbol_table* symtab); | |
696 | ||
697 | // Return the offset of GOT page entry for VALUE. | |
698 | unsigned int | |
699 | get_got_page_offset(Mips_address value, | |
700 | Mips_output_data_got<size, big_endian>* got); | |
701 | ||
702 | // Count the number of GOT entries required. | |
703 | void | |
704 | count_got_entries(); | |
705 | ||
706 | // Count the number of GOT entries required by ENTRY. Accumulate the result. | |
707 | void | |
708 | count_got_entry(Mips_got_entry<size, big_endian>* entry); | |
709 | ||
710 | // Add FROM's GOT entries. | |
711 | void | |
712 | add_got_entries(Mips_got_info<size, big_endian>* from); | |
713 | ||
714 | // Add FROM's GOT page entries. | |
715 | void | |
716 | add_got_page_entries(Mips_got_info<size, big_endian>* from); | |
717 | ||
718 | // Return GOT size. | |
719 | unsigned int | |
720 | got_size() const | |
721 | { return ((2 + this->local_gotno_ + this->page_gotno_ + this->global_gotno_ | |
722 | + this->tls_gotno_) * size/8); | |
723 | } | |
724 | ||
725 | // Return the number of local GOT entries. | |
726 | unsigned int | |
727 | local_gotno() const | |
728 | { return this->local_gotno_; } | |
729 | ||
730 | // Return the maximum number of page GOT entries needed. | |
731 | unsigned int | |
732 | page_gotno() const | |
733 | { return this->page_gotno_; } | |
734 | ||
735 | // Return the number of global GOT entries. | |
736 | unsigned int | |
737 | global_gotno() const | |
738 | { return this->global_gotno_; } | |
739 | ||
740 | // Set the number of global GOT entries. | |
741 | void | |
742 | set_global_gotno(unsigned int global_gotno) | |
743 | { this->global_gotno_ = global_gotno; } | |
744 | ||
745 | // Return the number of GGA_RELOC_ONLY global GOT entries. | |
746 | unsigned int | |
747 | reloc_only_gotno() const | |
748 | { return this->reloc_only_gotno_; } | |
749 | ||
750 | // Return the number of TLS GOT entries. | |
751 | unsigned int | |
752 | tls_gotno() const | |
753 | { return this->tls_gotno_; } | |
754 | ||
755 | // Return the GOT type for this GOT. Used for multi-GOT links only. | |
756 | unsigned int | |
757 | multigot_got_type(unsigned int got_type) const | |
758 | { | |
759 | switch (got_type) | |
760 | { | |
761 | case GOT_TYPE_STANDARD: | |
762 | return GOT_TYPE_STANDARD_MULTIGOT + this->index_; | |
763 | case GOT_TYPE_TLS_OFFSET: | |
764 | return GOT_TYPE_TLS_OFFSET_MULTIGOT + this->index_; | |
765 | case GOT_TYPE_TLS_PAIR: | |
766 | return GOT_TYPE_TLS_PAIR_MULTIGOT + this->index_; | |
767 | default: | |
768 | gold_unreachable(); | |
769 | } | |
770 | } | |
771 | ||
772 | // Remove lazy-binding stubs for global symbols in this GOT. | |
773 | void | |
774 | remove_lazy_stubs(Target_mips<size, big_endian>* target); | |
775 | ||
776 | // Return offset of this GOT from the start of .got section. | |
777 | unsigned int | |
778 | offset() const | |
779 | { return this->offset_; } | |
780 | ||
781 | // Set offset of this GOT from the start of .got section. | |
782 | void | |
783 | set_offset(unsigned int offset) | |
784 | { this->offset_ = offset; } | |
785 | ||
786 | // Set index of this GOT in multi-GOT links. | |
787 | void | |
788 | set_index(unsigned int index) | |
789 | { this->index_ = index; } | |
790 | ||
791 | // Return next GOT in multi-GOT links. | |
792 | Mips_got_info<size, big_endian>* | |
793 | next() const | |
794 | { return this->next_; } | |
795 | ||
796 | // Set next GOT in multi-GOT links. | |
797 | void | |
798 | set_next(Mips_got_info<size, big_endian>* next) | |
799 | { this->next_ = next; } | |
800 | ||
801 | // Return the offset of TLS LDM entry for this GOT. | |
802 | unsigned int | |
803 | tls_ldm_offset() const | |
804 | { return this->tls_ldm_offset_; } | |
805 | ||
806 | // Set the offset of TLS LDM entry for this GOT. | |
807 | void | |
808 | set_tls_ldm_offset(unsigned int tls_ldm_offset) | |
809 | { this->tls_ldm_offset_ = tls_ldm_offset; } | |
810 | ||
811 | Unordered_set<Mips_symbol<size>*>& | |
812 | global_got_symbols() | |
813 | { return this->global_got_symbols_; } | |
814 | ||
815 | // Return the GOT_TLS_* type required by relocation type R_TYPE. | |
816 | static int | |
817 | mips_elf_reloc_tls_type(unsigned int r_type) | |
818 | { | |
819 | if (tls_gd_reloc(r_type)) | |
820 | return GOT_TLS_GD; | |
821 | ||
822 | if (tls_ldm_reloc(r_type)) | |
823 | return GOT_TLS_LDM; | |
824 | ||
825 | if (tls_gottprel_reloc(r_type)) | |
826 | return GOT_TLS_IE; | |
827 | ||
828 | return GOT_TLS_NONE; | |
829 | } | |
830 | ||
831 | // Return the number of GOT slots needed for GOT TLS type TYPE. | |
832 | static int | |
833 | mips_tls_got_entries(unsigned int type) | |
834 | { | |
835 | switch (type) | |
836 | { | |
837 | case GOT_TLS_GD: | |
838 | case GOT_TLS_LDM: | |
839 | return 2; | |
840 | ||
841 | case GOT_TLS_IE: | |
842 | return 1; | |
843 | ||
844 | case GOT_TLS_NONE: | |
845 | return 0; | |
846 | ||
847 | default: | |
848 | gold_unreachable(); | |
849 | } | |
850 | } | |
851 | ||
852 | private: | |
853 | // The number of local GOT entries. | |
854 | unsigned int local_gotno_; | |
855 | // The maximum number of page GOT entries needed. | |
856 | unsigned int page_gotno_; | |
857 | // The number of global GOT entries. | |
858 | unsigned int global_gotno_; | |
859 | // The number of global GOT entries that are in the GGA_RELOC_ONLY area. | |
860 | unsigned int reloc_only_gotno_; | |
861 | // The number of TLS GOT entries. | |
862 | unsigned int tls_gotno_; | |
863 | // The offset of TLS LDM entry for this GOT. | |
864 | unsigned int tls_ldm_offset_; | |
865 | // All symbols that have global GOT entry. | |
866 | Unordered_set<Mips_symbol<size>*> global_got_symbols_; | |
867 | // A hash table holding GOT entries. | |
868 | Got_entry_set got_entries_; | |
869 | // A hash table of GOT page entries. | |
870 | Got_page_entry_set got_page_entries_; | |
871 | // The offset of first GOT page entry for this GOT. | |
872 | unsigned int got_page_offset_start_; | |
873 | // The offset of next available GOT page entry for this GOT. | |
874 | unsigned int got_page_offset_next_; | |
875 | // A hash table that maps GOT page entry value to the GOT offset where | |
876 | // the entry is located. | |
877 | Got_page_offsets got_page_offsets_; | |
878 | // In multi-GOT links, a pointer to the next GOT. | |
879 | Mips_got_info<size, big_endian>* next_; | |
880 | // Index of this GOT in multi-GOT links. | |
881 | unsigned int index_; | |
882 | // The offset of this GOT in multi-GOT links. | |
883 | unsigned int offset_; | |
884 | }; | |
885 | ||
886 | // This is a helper class used during relocation scan. It records GOT16 addend. | |
887 | ||
888 | template<int size, bool big_endian> | |
889 | struct got16_addend | |
890 | { | |
891 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
892 | ||
893 | got16_addend(const Sized_relobj_file<size, big_endian>* _object, | |
894 | unsigned int _shndx, unsigned int _r_type, unsigned int _r_sym, | |
895 | Mips_address _addend) | |
896 | : object(_object), shndx(_shndx), r_type(_r_type), r_sym(_r_sym), | |
897 | addend(_addend) | |
898 | { } | |
899 | ||
900 | const Sized_relobj_file<size, big_endian>* object; | |
901 | unsigned int shndx; | |
902 | unsigned int r_type; | |
903 | unsigned int r_sym; | |
904 | Mips_address addend; | |
905 | }; | |
906 | ||
907 | // Mips_symbol class. Holds additional symbol information needed for Mips. | |
908 | ||
909 | template<int size> | |
910 | class Mips_symbol : public Sized_symbol<size> | |
911 | { | |
912 | public: | |
913 | Mips_symbol() | |
914 | : need_fn_stub_(false), has_nonpic_branches_(false), la25_stub_offset_(-1U), | |
915 | has_static_relocs_(false), no_lazy_stub_(false), lazy_stub_offset_(0), | |
916 | pointer_equality_needed_(false), global_got_area_(GGA_NONE), | |
917 | global_gotoffset_(-1U), got_only_for_calls_(true), has_lazy_stub_(false), | |
918 | needs_mips_plt_(false), needs_comp_plt_(false), mips_plt_offset_(-1U), | |
919 | comp_plt_offset_(-1U), mips16_fn_stub_(NULL), mips16_call_stub_(NULL), | |
920 | mips16_call_fp_stub_(NULL), applied_secondary_got_fixup_(false) | |
921 | { } | |
922 | ||
923 | // Return whether this is a MIPS16 symbol. | |
924 | bool | |
925 | is_mips16() const | |
926 | { | |
927 | // (st_other & STO_MIPS16) == STO_MIPS16 | |
928 | return ((this->nonvis() & (elfcpp::STO_MIPS16 >> 2)) | |
929 | == elfcpp::STO_MIPS16 >> 2); | |
930 | } | |
931 | ||
932 | // Return whether this is a microMIPS symbol. | |
933 | bool | |
934 | is_micromips() const | |
935 | { | |
936 | // (st_other & STO_MIPS_ISA) == STO_MICROMIPS | |
937 | return ((this->nonvis() & (elfcpp::STO_MIPS_ISA >> 2)) | |
938 | == elfcpp::STO_MICROMIPS >> 2); | |
939 | } | |
940 | ||
941 | // Return whether the symbol needs MIPS16 fn_stub. | |
942 | bool | |
943 | need_fn_stub() const | |
944 | { return this->need_fn_stub_; } | |
945 | ||
946 | // Set that the symbol needs MIPS16 fn_stub. | |
947 | void | |
948 | set_need_fn_stub() | |
949 | { this->need_fn_stub_ = true; } | |
950 | ||
951 | // Return whether this symbol is referenced by branch relocations from | |
952 | // any non-PIC input file. | |
953 | bool | |
954 | has_nonpic_branches() const | |
955 | { return this->has_nonpic_branches_; } | |
956 | ||
957 | // Set that this symbol is referenced by branch relocations from | |
958 | // any non-PIC input file. | |
959 | void | |
960 | set_has_nonpic_branches() | |
961 | { this->has_nonpic_branches_ = true; } | |
962 | ||
963 | // Return the offset of the la25 stub for this symbol from the start of the | |
964 | // la25 stub section. | |
965 | unsigned int | |
966 | la25_stub_offset() const | |
967 | { return this->la25_stub_offset_; } | |
968 | ||
969 | // Set the offset of the la25 stub for this symbol from the start of the | |
970 | // la25 stub section. | |
971 | void | |
972 | set_la25_stub_offset(unsigned int offset) | |
973 | { this->la25_stub_offset_ = offset; } | |
974 | ||
975 | // Return whether the symbol has la25 stub. This is true if this symbol is | |
976 | // for a PIC function, and there are non-PIC branches and jumps to it. | |
977 | bool | |
978 | has_la25_stub() const | |
979 | { return this->la25_stub_offset_ != -1U; } | |
980 | ||
981 | // Return whether there is a relocation against this symbol that must be | |
982 | // resolved by the static linker (that is, the relocation cannot possibly | |
983 | // be made dynamic). | |
984 | bool | |
985 | has_static_relocs() const | |
986 | { return this->has_static_relocs_; } | |
987 | ||
988 | // Set that there is a relocation against this symbol that must be resolved | |
989 | // by the static linker (that is, the relocation cannot possibly be made | |
990 | // dynamic). | |
991 | void | |
992 | set_has_static_relocs() | |
993 | { this->has_static_relocs_ = true; } | |
994 | ||
995 | // Return whether we must not create a lazy-binding stub for this symbol. | |
996 | bool | |
997 | no_lazy_stub() const | |
998 | { return this->no_lazy_stub_; } | |
999 | ||
1000 | // Set that we must not create a lazy-binding stub for this symbol. | |
1001 | void | |
1002 | set_no_lazy_stub() | |
1003 | { this->no_lazy_stub_ = true; } | |
1004 | ||
1005 | // Return the offset of the lazy-binding stub for this symbol from the start | |
1006 | // of .MIPS.stubs section. | |
1007 | unsigned int | |
1008 | lazy_stub_offset() const | |
1009 | { return this->lazy_stub_offset_; } | |
1010 | ||
1011 | // Set the offset of the lazy-binding stub for this symbol from the start | |
1012 | // of .MIPS.stubs section. | |
1013 | void | |
1014 | set_lazy_stub_offset(unsigned int offset) | |
1015 | { this->lazy_stub_offset_ = offset; } | |
1016 | ||
1017 | // Return whether there are any relocations for this symbol where | |
1018 | // pointer equality matters. | |
1019 | bool | |
1020 | pointer_equality_needed() const | |
1021 | { return this->pointer_equality_needed_; } | |
1022 | ||
1023 | // Set that there are relocations for this symbol where pointer equality | |
1024 | // matters. | |
1025 | void | |
1026 | set_pointer_equality_needed() | |
1027 | { this->pointer_equality_needed_ = true; } | |
1028 | ||
1029 | // Return global GOT area where this symbol in located. | |
1030 | Global_got_area | |
1031 | global_got_area() const | |
1032 | { return this->global_got_area_; } | |
1033 | ||
1034 | // Set global GOT area where this symbol in located. | |
1035 | void | |
1036 | set_global_got_area(Global_got_area global_got_area) | |
1037 | { this->global_got_area_ = global_got_area; } | |
1038 | ||
1039 | // Return the global GOT offset for this symbol. For multi-GOT links, this | |
1040 | // returns the offset from the start of .got section to the first GOT entry | |
1041 | // for the symbol. Note that in multi-GOT links the symbol can have entry | |
1042 | // in more than one GOT. | |
1043 | unsigned int | |
1044 | global_gotoffset() const | |
1045 | { return this->global_gotoffset_; } | |
1046 | ||
1047 | // Set the global GOT offset for this symbol. Note that in multi-GOT links | |
1048 | // the symbol can have entry in more than one GOT. This method will set | |
1049 | // the offset only if it is less than current offset. | |
1050 | void | |
1051 | set_global_gotoffset(unsigned int offset) | |
1052 | { | |
1053 | if (this->global_gotoffset_ == -1U || offset < this->global_gotoffset_) | |
1054 | this->global_gotoffset_ = offset; | |
1055 | } | |
1056 | ||
1057 | // Return whether all GOT relocations for this symbol are for calls. | |
1058 | bool | |
1059 | got_only_for_calls() const | |
1060 | { return this->got_only_for_calls_; } | |
1061 | ||
1062 | // Set that there is a GOT relocation for this symbol that is not for call. | |
1063 | void | |
1064 | set_got_not_only_for_calls() | |
1065 | { this->got_only_for_calls_ = false; } | |
1066 | ||
1067 | // Return whether this is a PIC symbol. | |
1068 | bool | |
1069 | is_pic() const | |
1070 | { | |
1071 | // (st_other & STO_MIPS_FLAGS) == STO_MIPS_PIC | |
1072 | return ((this->nonvis() & (elfcpp::STO_MIPS_FLAGS >> 2)) | |
1073 | == (elfcpp::STO_MIPS_PIC >> 2)); | |
1074 | } | |
1075 | ||
1076 | // Set the flag in st_other field that marks this symbol as PIC. | |
1077 | void | |
1078 | set_pic() | |
1079 | { | |
1080 | if (this->is_mips16()) | |
1081 | // (st_other & ~(STO_MIPS16 | STO_MIPS_FLAGS)) | STO_MIPS_PIC | |
1082 | this->set_nonvis((this->nonvis() | |
1083 | & ~((elfcpp::STO_MIPS16 >> 2) | |
1084 | | (elfcpp::STO_MIPS_FLAGS >> 2))) | |
1085 | | (elfcpp::STO_MIPS_PIC >> 2)); | |
1086 | else | |
1087 | // (other & ~STO_MIPS_FLAGS) | STO_MIPS_PIC | |
1088 | this->set_nonvis((this->nonvis() & ~(elfcpp::STO_MIPS_FLAGS >> 2)) | |
1089 | | (elfcpp::STO_MIPS_PIC >> 2)); | |
1090 | } | |
1091 | ||
1092 | // Set the flag in st_other field that marks this symbol as PLT. | |
1093 | void | |
1094 | set_mips_plt() | |
1095 | { | |
1096 | if (this->is_mips16()) | |
1097 | // (st_other & (STO_MIPS16 | ~STO_MIPS_FLAGS)) | STO_MIPS_PLT | |
1098 | this->set_nonvis((this->nonvis() | |
1099 | & ((elfcpp::STO_MIPS16 >> 2) | |
1100 | | ~(elfcpp::STO_MIPS_FLAGS >> 2))) | |
1101 | | (elfcpp::STO_MIPS_PLT >> 2)); | |
1102 | ||
1103 | else | |
1104 | // (st_other & ~STO_MIPS_FLAGS) | STO_MIPS_PLT | |
1105 | this->set_nonvis((this->nonvis() & ~(elfcpp::STO_MIPS_FLAGS >> 2)) | |
1106 | | (elfcpp::STO_MIPS_PLT >> 2)); | |
1107 | } | |
1108 | ||
1109 | // Downcast a base pointer to a Mips_symbol pointer. | |
1110 | static Mips_symbol<size>* | |
1111 | as_mips_sym(Symbol* sym) | |
1112 | { return static_cast<Mips_symbol<size>*>(sym); } | |
1113 | ||
1114 | // Downcast a base pointer to a Mips_symbol pointer. | |
1115 | static const Mips_symbol<size>* | |
1116 | as_mips_sym(const Symbol* sym) | |
1117 | { return static_cast<const Mips_symbol<size>*>(sym); } | |
1118 | ||
1119 | // Return whether the symbol has lazy-binding stub. | |
1120 | bool | |
1121 | has_lazy_stub() const | |
1122 | { return this->has_lazy_stub_; } | |
1123 | ||
1124 | // Set whether the symbol has lazy-binding stub. | |
1125 | void | |
1126 | set_has_lazy_stub(bool has_lazy_stub) | |
1127 | { this->has_lazy_stub_ = has_lazy_stub; } | |
1128 | ||
1129 | // Return whether the symbol needs a standard PLT entry. | |
1130 | bool | |
1131 | needs_mips_plt() const | |
1132 | { return this->needs_mips_plt_; } | |
1133 | ||
1134 | // Set whether the symbol needs a standard PLT entry. | |
1135 | void | |
1136 | set_needs_mips_plt(bool needs_mips_plt) | |
1137 | { this->needs_mips_plt_ = needs_mips_plt; } | |
1138 | ||
1139 | // Return whether the symbol needs a compressed (MIPS16 or microMIPS) PLT | |
1140 | // entry. | |
1141 | bool | |
1142 | needs_comp_plt() const | |
1143 | { return this->needs_comp_plt_; } | |
1144 | ||
1145 | // Set whether the symbol needs a compressed (MIPS16 or microMIPS) PLT entry. | |
1146 | void | |
1147 | set_needs_comp_plt(bool needs_comp_plt) | |
1148 | { this->needs_comp_plt_ = needs_comp_plt; } | |
1149 | ||
1150 | // Return standard PLT entry offset, or -1 if none. | |
1151 | unsigned int | |
1152 | mips_plt_offset() const | |
1153 | { return this->mips_plt_offset_; } | |
1154 | ||
1155 | // Set standard PLT entry offset. | |
1156 | void | |
1157 | set_mips_plt_offset(unsigned int mips_plt_offset) | |
1158 | { this->mips_plt_offset_ = mips_plt_offset; } | |
1159 | ||
1160 | // Return whether the symbol has standard PLT entry. | |
1161 | bool | |
1162 | has_mips_plt_offset() const | |
1163 | { return this->mips_plt_offset_ != -1U; } | |
1164 | ||
1165 | // Return compressed (MIPS16 or microMIPS) PLT entry offset, or -1 if none. | |
1166 | unsigned int | |
1167 | comp_plt_offset() const | |
1168 | { return this->comp_plt_offset_; } | |
1169 | ||
1170 | // Set compressed (MIPS16 or microMIPS) PLT entry offset. | |
1171 | void | |
1172 | set_comp_plt_offset(unsigned int comp_plt_offset) | |
1173 | { this->comp_plt_offset_ = comp_plt_offset; } | |
1174 | ||
1175 | // Return whether the symbol has compressed (MIPS16 or microMIPS) PLT entry. | |
1176 | bool | |
1177 | has_comp_plt_offset() const | |
1178 | { return this->comp_plt_offset_ != -1U; } | |
1179 | ||
1180 | // Return MIPS16 fn stub for a symbol. | |
1181 | template<bool big_endian> | |
1182 | Mips16_stub_section<size, big_endian>* | |
1183 | get_mips16_fn_stub() const | |
1184 | { | |
1185 | return static_cast<Mips16_stub_section<size, big_endian>*>(mips16_fn_stub_); | |
1186 | } | |
1187 | ||
1188 | // Set MIPS16 fn stub for a symbol. | |
1189 | void | |
1190 | set_mips16_fn_stub(Mips16_stub_section_base* stub) | |
1191 | { this->mips16_fn_stub_ = stub; } | |
1192 | ||
1193 | // Return whether symbol has MIPS16 fn stub. | |
1194 | bool | |
1195 | has_mips16_fn_stub() const | |
1196 | { return this->mips16_fn_stub_ != NULL; } | |
1197 | ||
1198 | // Return MIPS16 call stub for a symbol. | |
1199 | template<bool big_endian> | |
1200 | Mips16_stub_section<size, big_endian>* | |
1201 | get_mips16_call_stub() const | |
1202 | { | |
1203 | return static_cast<Mips16_stub_section<size, big_endian>*>( | |
1204 | mips16_call_stub_); | |
1205 | } | |
1206 | ||
1207 | // Set MIPS16 call stub for a symbol. | |
1208 | void | |
1209 | set_mips16_call_stub(Mips16_stub_section_base* stub) | |
1210 | { this->mips16_call_stub_ = stub; } | |
1211 | ||
1212 | // Return whether symbol has MIPS16 call stub. | |
1213 | bool | |
1214 | has_mips16_call_stub() const | |
1215 | { return this->mips16_call_stub_ != NULL; } | |
1216 | ||
1217 | // Return MIPS16 call_fp stub for a symbol. | |
1218 | template<bool big_endian> | |
1219 | Mips16_stub_section<size, big_endian>* | |
1220 | get_mips16_call_fp_stub() const | |
1221 | { | |
1222 | return static_cast<Mips16_stub_section<size, big_endian>*>( | |
1223 | mips16_call_fp_stub_); | |
1224 | } | |
1225 | ||
1226 | // Set MIPS16 call_fp stub for a symbol. | |
1227 | void | |
1228 | set_mips16_call_fp_stub(Mips16_stub_section_base* stub) | |
1229 | { this->mips16_call_fp_stub_ = stub; } | |
1230 | ||
1231 | // Return whether symbol has MIPS16 call_fp stub. | |
1232 | bool | |
1233 | has_mips16_call_fp_stub() const | |
1234 | { return this->mips16_call_fp_stub_ != NULL; } | |
1235 | ||
1236 | bool | |
1237 | get_applied_secondary_got_fixup() const | |
1238 | { return applied_secondary_got_fixup_; } | |
1239 | ||
1240 | void | |
1241 | set_applied_secondary_got_fixup() | |
1242 | { this->applied_secondary_got_fixup_ = true; } | |
1243 | ||
1244 | private: | |
1245 | // Whether the symbol needs MIPS16 fn_stub. This is true if this symbol | |
1246 | // appears in any relocs other than a 16 bit call. | |
1247 | bool need_fn_stub_; | |
1248 | ||
1249 | // True if this symbol is referenced by branch relocations from | |
1250 | // any non-PIC input file. This is used to determine whether an | |
1251 | // la25 stub is required. | |
1252 | bool has_nonpic_branches_; | |
1253 | ||
1254 | // The offset of the la25 stub for this symbol from the start of the | |
1255 | // la25 stub section. | |
1256 | unsigned int la25_stub_offset_; | |
1257 | ||
1258 | // True if there is a relocation against this symbol that must be | |
1259 | // resolved by the static linker (that is, the relocation cannot | |
1260 | // possibly be made dynamic). | |
1261 | bool has_static_relocs_; | |
1262 | ||
1263 | // Whether we must not create a lazy-binding stub for this symbol. | |
1264 | // This is true if the symbol has relocations related to taking the | |
1265 | // function's address. | |
1266 | bool no_lazy_stub_; | |
1267 | ||
1268 | // The offset of the lazy-binding stub for this symbol from the start of | |
1269 | // .MIPS.stubs section. | |
1270 | unsigned int lazy_stub_offset_; | |
1271 | ||
1272 | // True if there are any relocations for this symbol where pointer equality | |
1273 | // matters. | |
1274 | bool pointer_equality_needed_; | |
1275 | ||
1276 | // Global GOT area where this symbol in located, or GGA_NONE if symbol is not | |
1277 | // in the global part of the GOT. | |
1278 | Global_got_area global_got_area_; | |
1279 | ||
1280 | // The global GOT offset for this symbol. For multi-GOT links, this is offset | |
1281 | // from the start of .got section to the first GOT entry for the symbol. | |
1282 | // Note that in multi-GOT links the symbol can have entry in more than one GOT. | |
1283 | unsigned int global_gotoffset_; | |
1284 | ||
1285 | // Whether all GOT relocations for this symbol are for calls. | |
1286 | bool got_only_for_calls_; | |
1287 | // Whether the symbol has lazy-binding stub. | |
1288 | bool has_lazy_stub_; | |
1289 | // Whether the symbol needs a standard PLT entry. | |
1290 | bool needs_mips_plt_; | |
1291 | // Whether the symbol needs a compressed (MIPS16 or microMIPS) PLT entry. | |
1292 | bool needs_comp_plt_; | |
1293 | // Standard PLT entry offset, or -1 if none. | |
1294 | unsigned int mips_plt_offset_; | |
1295 | // Compressed (MIPS16 or microMIPS) PLT entry offset, or -1 if none. | |
1296 | unsigned int comp_plt_offset_; | |
1297 | // MIPS16 fn stub for a symbol. | |
1298 | Mips16_stub_section_base* mips16_fn_stub_; | |
1299 | // MIPS16 call stub for a symbol. | |
1300 | Mips16_stub_section_base* mips16_call_stub_; | |
1301 | // MIPS16 call_fp stub for a symbol. | |
1302 | Mips16_stub_section_base* mips16_call_fp_stub_; | |
1303 | ||
1304 | bool applied_secondary_got_fixup_; | |
1305 | }; | |
1306 | ||
1307 | // Mips16_stub_section class. | |
1308 | ||
1309 | // The mips16 compiler uses a couple of special sections to handle | |
1310 | // floating point arguments. | |
1311 | ||
1312 | // Section names that look like .mips16.fn.FNNAME contain stubs that | |
1313 | // copy floating point arguments from the fp regs to the gp regs and | |
1314 | // then jump to FNNAME. If any 32 bit function calls FNNAME, the | |
1315 | // call should be redirected to the stub instead. If no 32 bit | |
1316 | // function calls FNNAME, the stub should be discarded. We need to | |
1317 | // consider any reference to the function, not just a call, because | |
1318 | // if the address of the function is taken we will need the stub, | |
1319 | // since the address might be passed to a 32 bit function. | |
1320 | ||
1321 | // Section names that look like .mips16.call.FNNAME contain stubs | |
1322 | // that copy floating point arguments from the gp regs to the fp | |
1323 | // regs and then jump to FNNAME. If FNNAME is a 32 bit function, | |
1324 | // then any 16 bit function that calls FNNAME should be redirected | |
1325 | // to the stub instead. If FNNAME is not a 32 bit function, the | |
1326 | // stub should be discarded. | |
1327 | ||
1328 | // .mips16.call.fp.FNNAME sections are similar, but contain stubs | |
1329 | // which call FNNAME and then copy the return value from the fp regs | |
1330 | // to the gp regs. These stubs store the return address in $18 while | |
1331 | // calling FNNAME; any function which might call one of these stubs | |
1332 | // must arrange to save $18 around the call. (This case is not | |
1333 | // needed for 32 bit functions that call 16 bit functions, because | |
1334 | // 16 bit functions always return floating point values in both | |
1335 | // $f0/$f1 and $2/$3.) | |
1336 | ||
1337 | // Note that in all cases FNNAME might be defined statically. | |
1338 | // Therefore, FNNAME is not used literally. Instead, the relocation | |
1339 | // information will indicate which symbol the section is for. | |
1340 | ||
1341 | // We record any stubs that we find in the symbol table. | |
1342 | ||
1343 | // TODO(sasa): All mips16 stub sections should be emitted in the .text section. | |
1344 | ||
1345 | class Mips16_stub_section_base { }; | |
1346 | ||
1347 | template<int size, bool big_endian> | |
1348 | class Mips16_stub_section : public Mips16_stub_section_base | |
1349 | { | |
1350 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
1351 | ||
1352 | public: | |
1353 | Mips16_stub_section(Mips_relobj<size, big_endian>* object, unsigned int shndx) | |
1354 | : object_(object), shndx_(shndx), r_sym_(0), gsym_(NULL), | |
1355 | found_r_mips_none_(false) | |
1356 | { | |
1357 | gold_assert(object->is_mips16_fn_stub_section(shndx) | |
1358 | || object->is_mips16_call_stub_section(shndx) | |
1359 | || object->is_mips16_call_fp_stub_section(shndx)); | |
1360 | } | |
1361 | ||
1362 | // Return the object of this stub section. | |
1363 | Mips_relobj<size, big_endian>* | |
1364 | object() const | |
1365 | { return this->object_; } | |
1366 | ||
1367 | // Return the size of a section. | |
1368 | uint64_t | |
1369 | section_size() const | |
1370 | { return this->object_->section_size(this->shndx_); } | |
1371 | ||
1372 | // Return section index of this stub section. | |
1373 | unsigned int | |
1374 | shndx() const | |
1375 | { return this->shndx_; } | |
1376 | ||
1377 | // Return symbol index, if stub is for a local function. | |
1378 | unsigned int | |
1379 | r_sym() const | |
1380 | { return this->r_sym_; } | |
1381 | ||
1382 | // Return symbol, if stub is for a global function. | |
1383 | Mips_symbol<size>* | |
1384 | gsym() const | |
1385 | { return this->gsym_; } | |
1386 | ||
1387 | // Return whether stub is for a local function. | |
1388 | bool | |
1389 | is_for_local_function() const | |
1390 | { return this->gsym_ == NULL; } | |
1391 | ||
1392 | // This method is called when a new relocation R_TYPE for local symbol R_SYM | |
1393 | // is found in the stub section. Try to find stub target. | |
1394 | void | |
1395 | new_local_reloc_found(unsigned int r_type, unsigned int r_sym) | |
1396 | { | |
1397 | // To find target symbol for this stub, trust the first R_MIPS_NONE | |
1398 | // relocation, if any. Otherwise trust the first relocation, whatever | |
1399 | // its kind. | |
1400 | if (this->found_r_mips_none_) | |
1401 | return; | |
1402 | if (r_type == elfcpp::R_MIPS_NONE) | |
1403 | { | |
1404 | this->r_sym_ = r_sym; | |
1405 | this->gsym_ = NULL; | |
1406 | this->found_r_mips_none_ = true; | |
1407 | } | |
1408 | else if (!is_target_found()) | |
1409 | this->r_sym_ = r_sym; | |
1410 | } | |
1411 | ||
1412 | // This method is called when a new relocation R_TYPE for global symbol GSYM | |
1413 | // is found in the stub section. Try to find stub target. | |
1414 | void | |
1415 | new_global_reloc_found(unsigned int r_type, Mips_symbol<size>* gsym) | |
1416 | { | |
1417 | // To find target symbol for this stub, trust the first R_MIPS_NONE | |
1418 | // relocation, if any. Otherwise trust the first relocation, whatever | |
1419 | // its kind. | |
1420 | if (this->found_r_mips_none_) | |
1421 | return; | |
1422 | if (r_type == elfcpp::R_MIPS_NONE) | |
1423 | { | |
1424 | this->gsym_ = gsym; | |
1425 | this->r_sym_ = 0; | |
1426 | this->found_r_mips_none_ = true; | |
1427 | } | |
1428 | else if (!is_target_found()) | |
1429 | this->gsym_ = gsym; | |
1430 | } | |
1431 | ||
1432 | // Return whether we found the stub target. | |
1433 | bool | |
1434 | is_target_found() const | |
1435 | { return this->r_sym_ != 0 || this->gsym_ != NULL; } | |
1436 | ||
1437 | // Return whether this is a fn stub. | |
1438 | bool | |
1439 | is_fn_stub() const | |
1440 | { return this->object_->is_mips16_fn_stub_section(this->shndx_); } | |
1441 | ||
1442 | // Return whether this is a call stub. | |
1443 | bool | |
1444 | is_call_stub() const | |
1445 | { return this->object_->is_mips16_call_stub_section(this->shndx_); } | |
1446 | ||
1447 | // Return whether this is a call_fp stub. | |
1448 | bool | |
1449 | is_call_fp_stub() const | |
1450 | { return this->object_->is_mips16_call_fp_stub_section(this->shndx_); } | |
1451 | ||
1452 | // Return the output address. | |
1453 | Mips_address | |
1454 | output_address() const | |
1455 | { | |
1456 | return (this->object_->output_section(this->shndx_)->address() | |
1457 | + this->object_->output_section_offset(this->shndx_)); | |
1458 | } | |
1459 | ||
1460 | private: | |
1461 | // The object of this stub section. | |
1462 | Mips_relobj<size, big_endian>* object_; | |
1463 | // The section index of this stub section. | |
1464 | unsigned int shndx_; | |
1465 | // The symbol index, if stub is for a local function. | |
1466 | unsigned int r_sym_; | |
1467 | // The symbol, if stub is for a global function. | |
1468 | Mips_symbol<size>* gsym_; | |
1469 | // True if we found R_MIPS_NONE relocation in this stub. | |
1470 | bool found_r_mips_none_; | |
1471 | }; | |
1472 | ||
1473 | // Mips_relobj class. | |
1474 | ||
1475 | template<int size, bool big_endian> | |
1476 | class Mips_relobj : public Sized_relobj_file<size, big_endian> | |
1477 | { | |
1478 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
1479 | typedef std::map<unsigned int, Mips16_stub_section<size, big_endian>*> | |
1480 | Mips16_stubs_int_map; | |
1481 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; | |
1482 | ||
1483 | public: | |
1484 | Mips_relobj(const std::string& name, Input_file* input_file, off_t offset, | |
1485 | const typename elfcpp::Ehdr<size, big_endian>& ehdr) | |
1486 | : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr), | |
1487 | processor_specific_flags_(0), local_symbol_is_mips16_(), | |
1488 | local_symbol_is_micromips_(), mips16_stub_sections_(), | |
1489 | local_non_16bit_calls_(), local_16bit_calls_(), local_mips16_fn_stubs_(), | |
1490 | local_mips16_call_stubs_(), gp_(0), got_info_(NULL), | |
1491 | section_is_mips16_fn_stub_(), section_is_mips16_call_stub_(), | |
1492 | section_is_mips16_call_fp_stub_(), pdr_shndx_(-1U), gprmask_(0), | |
1493 | cprmask1_(0), cprmask2_(0), cprmask3_(0), cprmask4_(0) | |
1494 | { | |
1495 | this->is_pic_ = (ehdr.get_e_flags() & elfcpp::EF_MIPS_PIC) != 0; | |
1496 | this->is_n32_ = elfcpp::abi_n32(ehdr.get_e_flags()); | |
1497 | this->is_n64_ = elfcpp::abi_64(ehdr.get_e_ident()[elfcpp::EI_CLASS]); | |
1498 | } | |
1499 | ||
1500 | ~Mips_relobj() | |
1501 | { } | |
1502 | ||
1503 | // Downcast a base pointer to a Mips_relobj pointer. This is | |
1504 | // not type-safe but we only use Mips_relobj not the base class. | |
1505 | static Mips_relobj<size, big_endian>* | |
1506 | as_mips_relobj(Relobj* relobj) | |
1507 | { return static_cast<Mips_relobj<size, big_endian>*>(relobj); } | |
1508 | ||
1509 | // Downcast a base pointer to a Mips_relobj pointer. This is | |
1510 | // not type-safe but we only use Mips_relobj not the base class. | |
1511 | static const Mips_relobj<size, big_endian>* | |
1512 | as_mips_relobj(const Relobj* relobj) | |
1513 | { return static_cast<const Mips_relobj<size, big_endian>*>(relobj); } | |
1514 | ||
1515 | // Processor-specific flags in ELF file header. This is valid only after | |
1516 | // reading symbols. | |
1517 | elfcpp::Elf_Word | |
1518 | processor_specific_flags() const | |
1519 | { return this->processor_specific_flags_; } | |
1520 | ||
1521 | // Whether a local symbol is MIPS16 symbol. R_SYM is the symbol table | |
1522 | // index. This is only valid after do_count_local_symbol is called. | |
1523 | bool | |
1524 | local_symbol_is_mips16(unsigned int r_sym) const | |
1525 | { | |
1526 | gold_assert(r_sym < this->local_symbol_is_mips16_.size()); | |
1527 | return this->local_symbol_is_mips16_[r_sym]; | |
1528 | } | |
1529 | ||
1530 | // Whether a local symbol is microMIPS symbol. R_SYM is the symbol table | |
1531 | // index. This is only valid after do_count_local_symbol is called. | |
1532 | bool | |
1533 | local_symbol_is_micromips(unsigned int r_sym) const | |
1534 | { | |
1535 | gold_assert(r_sym < this->local_symbol_is_micromips_.size()); | |
1536 | return this->local_symbol_is_micromips_[r_sym]; | |
1537 | } | |
1538 | ||
1539 | // Get or create MIPS16 stub section. | |
1540 | Mips16_stub_section<size, big_endian>* | |
1541 | get_mips16_stub_section(unsigned int shndx) | |
1542 | { | |
1543 | typename Mips16_stubs_int_map::const_iterator it = | |
1544 | this->mips16_stub_sections_.find(shndx); | |
1545 | if (it != this->mips16_stub_sections_.end()) | |
1546 | return (*it).second; | |
1547 | ||
1548 | Mips16_stub_section<size, big_endian>* stub_section = | |
1549 | new Mips16_stub_section<size, big_endian>(this, shndx); | |
1550 | this->mips16_stub_sections_.insert( | |
1551 | std::pair<unsigned int, Mips16_stub_section<size, big_endian>*>( | |
1552 | stub_section->shndx(), stub_section)); | |
1553 | return stub_section; | |
1554 | } | |
1555 | ||
1556 | // Return MIPS16 fn stub section for local symbol R_SYM, or NULL if this | |
1557 | // object doesn't have fn stub for R_SYM. | |
1558 | Mips16_stub_section<size, big_endian>* | |
1559 | get_local_mips16_fn_stub(unsigned int r_sym) const | |
1560 | { | |
1561 | typename Mips16_stubs_int_map::const_iterator it = | |
1562 | this->local_mips16_fn_stubs_.find(r_sym); | |
1563 | if (it != this->local_mips16_fn_stubs_.end()) | |
1564 | return (*it).second; | |
1565 | return NULL; | |
1566 | } | |
1567 | ||
1568 | // Record that this object has MIPS16 fn stub for local symbol. This method | |
1569 | // is only called if we decided not to discard the stub. | |
1570 | void | |
1571 | add_local_mips16_fn_stub(Mips16_stub_section<size, big_endian>* stub) | |
1572 | { | |
1573 | gold_assert(stub->is_for_local_function()); | |
1574 | unsigned int r_sym = stub->r_sym(); | |
1575 | this->local_mips16_fn_stubs_.insert( | |
1576 | std::pair<unsigned int, Mips16_stub_section<size, big_endian>*>( | |
1577 | r_sym, stub)); | |
1578 | } | |
1579 | ||
1580 | // Return MIPS16 call stub section for local symbol R_SYM, or NULL if this | |
1581 | // object doesn't have call stub for R_SYM. | |
1582 | Mips16_stub_section<size, big_endian>* | |
1583 | get_local_mips16_call_stub(unsigned int r_sym) const | |
1584 | { | |
1585 | typename Mips16_stubs_int_map::const_iterator it = | |
1586 | this->local_mips16_call_stubs_.find(r_sym); | |
1587 | if (it != this->local_mips16_call_stubs_.end()) | |
1588 | return (*it).second; | |
1589 | return NULL; | |
1590 | } | |
1591 | ||
1592 | // Record that this object has MIPS16 call stub for local symbol. This method | |
1593 | // is only called if we decided not to discard the stub. | |
1594 | void | |
1595 | add_local_mips16_call_stub(Mips16_stub_section<size, big_endian>* stub) | |
1596 | { | |
1597 | gold_assert(stub->is_for_local_function()); | |
1598 | unsigned int r_sym = stub->r_sym(); | |
1599 | this->local_mips16_call_stubs_.insert( | |
1600 | std::pair<unsigned int, Mips16_stub_section<size, big_endian>*>( | |
1601 | r_sym, stub)); | |
1602 | } | |
1603 | ||
1604 | // Record that we found "non 16-bit" call relocation against local symbol | |
1605 | // SYMNDX. This reloc would need to refer to a MIPS16 fn stub, if there | |
1606 | // is one. | |
1607 | void | |
1608 | add_local_non_16bit_call(unsigned int symndx) | |
1609 | { this->local_non_16bit_calls_.insert(symndx); } | |
1610 | ||
1611 | // Return true if there is any "non 16-bit" call relocation against local | |
1612 | // symbol SYMNDX in this object. | |
1613 | bool | |
1614 | has_local_non_16bit_call_relocs(unsigned int symndx) | |
1615 | { | |
1616 | return (this->local_non_16bit_calls_.find(symndx) | |
1617 | != this->local_non_16bit_calls_.end()); | |
1618 | } | |
1619 | ||
1620 | // Record that we found 16-bit call relocation R_MIPS16_26 against local | |
1621 | // symbol SYMNDX. Local MIPS16 call or call_fp stubs will only be needed | |
1622 | // if there is some R_MIPS16_26 relocation that refers to the stub symbol. | |
1623 | void | |
1624 | add_local_16bit_call(unsigned int symndx) | |
1625 | { this->local_16bit_calls_.insert(symndx); } | |
1626 | ||
1627 | // Return true if there is any 16-bit call relocation R_MIPS16_26 against local | |
1628 | // symbol SYMNDX in this object. | |
1629 | bool | |
1630 | has_local_16bit_call_relocs(unsigned int symndx) | |
1631 | { | |
1632 | return (this->local_16bit_calls_.find(symndx) | |
1633 | != this->local_16bit_calls_.end()); | |
1634 | } | |
1635 | ||
1636 | // Get gp value that was used to create this object. | |
1637 | Mips_address | |
1638 | gp_value() const | |
1639 | { return this->gp_; } | |
1640 | ||
1641 | // Return whether the object is a PIC object. | |
1642 | bool | |
1643 | is_pic() const | |
1644 | { return this->is_pic_; } | |
1645 | ||
1646 | // Return whether the object uses N32 ABI. | |
1647 | bool | |
1648 | is_n32() const | |
1649 | { return this->is_n32_; } | |
1650 | ||
1651 | // Return whether the object uses N64 ABI. | |
1652 | bool | |
1653 | is_n64() const | |
1654 | { return this->is_n64_; } | |
1655 | ||
1656 | // Return whether the object uses NewABI conventions. | |
1657 | bool | |
1658 | is_newabi() const | |
1659 | { return this->is_n32_ || this->is_n64_; } | |
1660 | ||
1661 | // Return Mips_got_info for this object. | |
1662 | Mips_got_info<size, big_endian>* | |
1663 | get_got_info() const | |
1664 | { return this->got_info_; } | |
1665 | ||
1666 | // Return Mips_got_info for this object. Create new info if it doesn't exist. | |
1667 | Mips_got_info<size, big_endian>* | |
1668 | get_or_create_got_info() | |
1669 | { | |
1670 | if (!this->got_info_) | |
1671 | this->got_info_ = new Mips_got_info<size, big_endian>(); | |
1672 | return this->got_info_; | |
1673 | } | |
1674 | ||
1675 | // Set Mips_got_info for this object. | |
1676 | void | |
1677 | set_got_info(Mips_got_info<size, big_endian>* got_info) | |
1678 | { this->got_info_ = got_info; } | |
1679 | ||
1680 | // Whether a section SHDNX is a MIPS16 stub section. This is only valid | |
1681 | // after do_read_symbols is called. | |
1682 | bool | |
1683 | is_mips16_stub_section(unsigned int shndx) | |
1684 | { | |
1685 | return (is_mips16_fn_stub_section(shndx) | |
1686 | || is_mips16_call_stub_section(shndx) | |
1687 | || is_mips16_call_fp_stub_section(shndx)); | |
1688 | } | |
1689 | ||
1690 | // Return TRUE if relocations in section SHNDX can refer directly to a | |
1691 | // MIPS16 function rather than to a hard-float stub. This is only valid | |
1692 | // after do_read_symbols is called. | |
1693 | bool | |
1694 | section_allows_mips16_refs(unsigned int shndx) | |
1695 | { | |
1696 | return (this->is_mips16_stub_section(shndx) || shndx == this->pdr_shndx_); | |
1697 | } | |
1698 | ||
1699 | // Whether a section SHDNX is a MIPS16 fn stub section. This is only valid | |
1700 | // after do_read_symbols is called. | |
1701 | bool | |
1702 | is_mips16_fn_stub_section(unsigned int shndx) | |
1703 | { | |
1704 | gold_assert(shndx < this->section_is_mips16_fn_stub_.size()); | |
1705 | return this->section_is_mips16_fn_stub_[shndx]; | |
1706 | } | |
1707 | ||
1708 | // Whether a section SHDNX is a MIPS16 call stub section. This is only valid | |
1709 | // after do_read_symbols is called. | |
1710 | bool | |
1711 | is_mips16_call_stub_section(unsigned int shndx) | |
1712 | { | |
1713 | gold_assert(shndx < this->section_is_mips16_call_stub_.size()); | |
1714 | return this->section_is_mips16_call_stub_[shndx]; | |
1715 | } | |
1716 | ||
1717 | // Whether a section SHDNX is a MIPS16 call_fp stub section. This is only | |
1718 | // valid after do_read_symbols is called. | |
1719 | bool | |
1720 | is_mips16_call_fp_stub_section(unsigned int shndx) | |
1721 | { | |
1722 | gold_assert(shndx < this->section_is_mips16_call_fp_stub_.size()); | |
1723 | return this->section_is_mips16_call_fp_stub_[shndx]; | |
1724 | } | |
1725 | ||
1726 | // Discard MIPS16 stub secions that are not needed. | |
1727 | void | |
1728 | discard_mips16_stub_sections(Symbol_table* symtab); | |
1729 | ||
1730 | // Return gprmask from the .reginfo section of this object. | |
1731 | Valtype | |
1732 | gprmask() const | |
1733 | { return this->gprmask_; } | |
1734 | ||
1735 | // Return cprmask1 from the .reginfo section of this object. | |
1736 | Valtype | |
1737 | cprmask1() const | |
1738 | { return this->cprmask1_; } | |
1739 | ||
1740 | // Return cprmask2 from the .reginfo section of this object. | |
1741 | Valtype | |
1742 | cprmask2() const | |
1743 | { return this->cprmask2_; } | |
1744 | ||
1745 | // Return cprmask3 from the .reginfo section of this object. | |
1746 | Valtype | |
1747 | cprmask3() const | |
1748 | { return this->cprmask3_; } | |
1749 | ||
1750 | // Return cprmask4 from the .reginfo section of this object. | |
1751 | Valtype | |
1752 | cprmask4() const | |
1753 | { return this->cprmask4_; } | |
1754 | ||
1755 | protected: | |
1756 | // Count the local symbols. | |
1757 | void | |
1758 | do_count_local_symbols(Stringpool_template<char>*, | |
1759 | Stringpool_template<char>*); | |
1760 | ||
1761 | // Read the symbol information. | |
1762 | void | |
1763 | do_read_symbols(Read_symbols_data* sd); | |
1764 | ||
1765 | private: | |
1766 | // processor-specific flags in ELF file header. | |
1767 | elfcpp::Elf_Word processor_specific_flags_; | |
1768 | ||
1769 | // Bit vector to tell if a local symbol is a MIPS16 symbol or not. | |
1770 | // This is only valid after do_count_local_symbol is called. | |
1771 | std::vector<bool> local_symbol_is_mips16_; | |
1772 | ||
1773 | // Bit vector to tell if a local symbol is a microMIPS symbol or not. | |
1774 | // This is only valid after do_count_local_symbol is called. | |
1775 | std::vector<bool> local_symbol_is_micromips_; | |
1776 | ||
1777 | // Map from section index to the MIPS16 stub for that section. This contains | |
1778 | // all stubs found in this object. | |
1779 | Mips16_stubs_int_map mips16_stub_sections_; | |
1780 | ||
1781 | // Local symbols that have "non 16-bit" call relocation. This relocation | |
1782 | // would need to refer to a MIPS16 fn stub, if there is one. | |
1783 | std::set<unsigned int> local_non_16bit_calls_; | |
1784 | ||
1785 | // Local symbols that have 16-bit call relocation R_MIPS16_26. Local MIPS16 | |
1786 | // call or call_fp stubs will only be needed if there is some R_MIPS16_26 | |
1787 | // relocation that refers to the stub symbol. | |
1788 | std::set<unsigned int> local_16bit_calls_; | |
1789 | ||
1790 | // Map from local symbol index to the MIPS16 fn stub for that symbol. | |
1791 | // This contains only the stubs that we decided not to discard. | |
1792 | Mips16_stubs_int_map local_mips16_fn_stubs_; | |
1793 | ||
1794 | // Map from local symbol index to the MIPS16 call stub for that symbol. | |
1795 | // This contains only the stubs that we decided not to discard. | |
1796 | Mips16_stubs_int_map local_mips16_call_stubs_; | |
1797 | ||
1798 | // gp value that was used to create this object. | |
1799 | Mips_address gp_; | |
1800 | // Whether the object is a PIC object. | |
1801 | bool is_pic_ : 1; | |
1802 | // Whether the object uses N32 ABI. | |
1803 | bool is_n32_ : 1; | |
1804 | // Whether the object uses N64 ABI. | |
1805 | bool is_n64_ : 1; | |
1806 | // The Mips_got_info for this object. | |
1807 | Mips_got_info<size, big_endian>* got_info_; | |
1808 | ||
1809 | // Bit vector to tell if a section is a MIPS16 fn stub section or not. | |
1810 | // This is only valid after do_read_symbols is called. | |
1811 | std::vector<bool> section_is_mips16_fn_stub_; | |
1812 | ||
1813 | // Bit vector to tell if a section is a MIPS16 call stub section or not. | |
1814 | // This is only valid after do_read_symbols is called. | |
1815 | std::vector<bool> section_is_mips16_call_stub_; | |
1816 | ||
1817 | // Bit vector to tell if a section is a MIPS16 call_fp stub section or not. | |
1818 | // This is only valid after do_read_symbols is called. | |
1819 | std::vector<bool> section_is_mips16_call_fp_stub_; | |
1820 | ||
1821 | // .pdr section index. | |
1822 | unsigned int pdr_shndx_; | |
1823 | ||
1824 | // gprmask from the .reginfo section of this object. | |
1825 | Valtype gprmask_; | |
1826 | // cprmask1 from the .reginfo section of this object. | |
1827 | Valtype cprmask1_; | |
1828 | // cprmask2 from the .reginfo section of this object. | |
1829 | Valtype cprmask2_; | |
1830 | // cprmask3 from the .reginfo section of this object. | |
1831 | Valtype cprmask3_; | |
1832 | // cprmask4 from the .reginfo section of this object. | |
1833 | Valtype cprmask4_; | |
1834 | }; | |
1835 | ||
1836 | // Mips_output_data_got class. | |
1837 | ||
1838 | template<int size, bool big_endian> | |
1839 | class Mips_output_data_got : public Output_data_got<size, big_endian> | |
1840 | { | |
1841 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
1842 | typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> | |
1843 | Reloc_section; | |
1844 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; | |
1845 | ||
1846 | public: | |
1847 | Mips_output_data_got(Target_mips<size, big_endian>* target, | |
1848 | Symbol_table* symtab, Layout* layout) | |
1849 | : Output_data_got<size, big_endian>(), target_(target), | |
1850 | symbol_table_(symtab), layout_(layout), static_relocs_(), got_view_(NULL), | |
1851 | first_global_got_dynsym_index_(-1U), primary_got_(NULL), | |
1852 | secondary_got_relocs_() | |
1853 | { | |
1854 | this->master_got_info_ = new Mips_got_info<size, big_endian>(); | |
1855 | this->set_addralign(16); | |
1856 | } | |
1857 | ||
1858 | // Reserve GOT entry for a GOT relocation of type R_TYPE against symbol | |
1859 | // SYMNDX + ADDEND, where SYMNDX is a local symbol in section SHNDX in OBJECT. | |
1860 | void | |
1861 | record_local_got_symbol(Mips_relobj<size, big_endian>* object, | |
1862 | unsigned int symndx, Mips_address addend, | |
1863 | unsigned int r_type, unsigned int shndx) | |
1864 | { | |
1865 | this->master_got_info_->record_local_got_symbol(object, symndx, addend, | |
1866 | r_type, shndx); | |
1867 | } | |
1868 | ||
1869 | // Reserve GOT entry for a GOT relocation of type R_TYPE against MIPS_SYM, | |
1870 | // in OBJECT. FOR_CALL is true if the caller is only interested in | |
1871 | // using the GOT entry for calls. DYN_RELOC is true if R_TYPE is a dynamic | |
1872 | // relocation. | |
1873 | void | |
1874 | record_global_got_symbol(Mips_symbol<size>* mips_sym, | |
1875 | Mips_relobj<size, big_endian>* object, | |
1876 | unsigned int r_type, bool dyn_reloc, bool for_call) | |
1877 | { | |
1878 | this->master_got_info_->record_global_got_symbol(mips_sym, object, r_type, | |
1879 | dyn_reloc, for_call); | |
1880 | } | |
1881 | ||
1882 | // Record that OBJECT has a page relocation against symbol SYMNDX and | |
1883 | // that ADDEND is the addend for that relocation. | |
1884 | void | |
1885 | record_got_page_entry(Mips_relobj<size, big_endian>* object, | |
1886 | unsigned int symndx, int addend) | |
1887 | { this->master_got_info_->record_got_page_entry(object, symndx, addend); } | |
1888 | ||
1889 | // Add a static entry for the GOT entry at OFFSET. GSYM is a global | |
1890 | // symbol and R_TYPE is the code of a dynamic relocation that needs to be | |
1891 | // applied in a static link. | |
1892 | void | |
1893 | add_static_reloc(unsigned int got_offset, unsigned int r_type, | |
1894 | Mips_symbol<size>* gsym) | |
1895 | { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); } | |
1896 | ||
1897 | // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object | |
1898 | // defining a local symbol with INDEX. R_TYPE is the code of a dynamic | |
1899 | // relocation that needs to be applied in a static link. | |
1900 | void | |
1901 | add_static_reloc(unsigned int got_offset, unsigned int r_type, | |
1902 | Sized_relobj_file<size, big_endian>* relobj, | |
1903 | unsigned int index) | |
1904 | { | |
1905 | this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj, | |
1906 | index)); | |
1907 | } | |
1908 | ||
1909 | // Record that global symbol GSYM has R_TYPE dynamic relocation in the | |
1910 | // secondary GOT at OFFSET. | |
1911 | void | |
1912 | add_secondary_got_reloc(unsigned int got_offset, unsigned int r_type, | |
1913 | Mips_symbol<size>* gsym) | |
1914 | { | |
1915 | this->secondary_got_relocs_.push_back(Static_reloc(got_offset, | |
1916 | r_type, gsym)); | |
1917 | } | |
1918 | ||
1919 | // Update GOT entry at OFFSET with VALUE. | |
1920 | void | |
1921 | update_got_entry(unsigned int offset, Mips_address value) | |
1922 | { | |
1923 | elfcpp::Swap<size, big_endian>::writeval(this->got_view_ + offset, value); | |
1924 | } | |
1925 | ||
1926 | // Return the number of entries in local part of the GOT. This includes | |
1927 | // local entries, page entries and 2 reserved entries. | |
1928 | unsigned int | |
1929 | get_local_gotno() const | |
1930 | { | |
1931 | if (!this->multi_got()) | |
1932 | { | |
1933 | return (2 + this->master_got_info_->local_gotno() | |
1934 | + this->master_got_info_->page_gotno()); | |
1935 | } | |
1936 | else | |
1937 | return 2 + this->primary_got_->local_gotno() + this->primary_got_->page_gotno(); | |
1938 | } | |
1939 | ||
1940 | // Return dynamic symbol table index of the first symbol with global GOT | |
1941 | // entry. | |
1942 | unsigned int | |
1943 | first_global_got_dynsym_index() const | |
1944 | { return this->first_global_got_dynsym_index_; } | |
1945 | ||
1946 | // Set dynamic symbol table index of the first symbol with global GOT entry. | |
1947 | void | |
1948 | set_first_global_got_dynsym_index(unsigned int index) | |
1949 | { this->first_global_got_dynsym_index_ = index; } | |
1950 | ||
1951 | // Lay out the GOT. Add local, global and TLS entries. If GOT is | |
1952 | // larger than 64K, create multi-GOT. | |
1953 | void | |
1954 | lay_out_got(Layout* layout, Symbol_table* symtab, | |
1955 | const Input_objects* input_objects); | |
1956 | ||
1957 | // Create multi-GOT. For every GOT, add local, global and TLS entries. | |
1958 | void | |
1959 | lay_out_multi_got(Layout* layout, const Input_objects* input_objects); | |
1960 | ||
1961 | // Attempt to merge GOTs of different input objects. | |
1962 | void | |
1963 | merge_gots(const Input_objects* input_objects); | |
1964 | ||
1965 | // Consider merging FROM, which is OBJECT's GOT, into TO. Return false if | |
1966 | // this would lead to overflow, true if they were merged successfully. | |
1967 | bool | |
1968 | merge_got_with(Mips_got_info<size, big_endian>* from, | |
1969 | Mips_relobj<size, big_endian>* object, | |
1970 | Mips_got_info<size, big_endian>* to); | |
1971 | ||
1972 | // Return the offset of GOT page entry for VALUE. For multi-GOT links, | |
1973 | // use OBJECT's GOT. | |
1974 | unsigned int | |
1975 | get_got_page_offset(Mips_address value, | |
1976 | const Mips_relobj<size, big_endian>* object) | |
1977 | { | |
1978 | Mips_got_info<size, big_endian>* g = (!this->multi_got() | |
1979 | ? this->master_got_info_ | |
1980 | : object->get_got_info()); | |
1981 | gold_assert(g != NULL); | |
1982 | return g->get_got_page_offset(value, this); | |
1983 | } | |
1984 | ||
1985 | // Return the GOT offset of type GOT_TYPE of the global symbol | |
1986 | // GSYM. For multi-GOT links, use OBJECT's GOT. | |
1987 | unsigned int got_offset(const Symbol* gsym, unsigned int got_type, | |
1988 | Mips_relobj<size, big_endian>* object) const | |
1989 | { | |
1990 | if (!this->multi_got()) | |
1991 | return gsym->got_offset(got_type); | |
1992 | else | |
1993 | { | |
1994 | Mips_got_info<size, big_endian>* g = object->get_got_info(); | |
1995 | gold_assert(g != NULL); | |
1996 | return gsym->got_offset(g->multigot_got_type(got_type)); | |
1997 | } | |
1998 | } | |
1999 | ||
2000 | // Return the GOT offset of type GOT_TYPE of the local symbol | |
2001 | // SYMNDX. | |
2002 | unsigned int | |
2003 | got_offset(unsigned int symndx, unsigned int got_type, | |
2004 | Sized_relobj_file<size, big_endian>* object) const | |
2005 | { return object->local_got_offset(symndx, got_type); } | |
2006 | ||
2007 | // Return the offset of TLS LDM entry. For multi-GOT links, use OBJECT's GOT. | |
2008 | unsigned int | |
2009 | tls_ldm_offset(Mips_relobj<size, big_endian>* object) const | |
2010 | { | |
2011 | Mips_got_info<size, big_endian>* g = (!this->multi_got() | |
2012 | ? this->master_got_info_ | |
2013 | : object->get_got_info()); | |
2014 | gold_assert(g != NULL); | |
2015 | return g->tls_ldm_offset(); | |
2016 | } | |
2017 | ||
2018 | // Set the offset of TLS LDM entry. For multi-GOT links, use OBJECT's GOT. | |
2019 | void | |
2020 | set_tls_ldm_offset(unsigned int tls_ldm_offset, | |
2021 | Mips_relobj<size, big_endian>* object) | |
2022 | { | |
2023 | Mips_got_info<size, big_endian>* g = (!this->multi_got() | |
2024 | ? this->master_got_info_ | |
2025 | : object->get_got_info()); | |
2026 | gold_assert(g != NULL); | |
2027 | g->set_tls_ldm_offset(tls_ldm_offset); | |
2028 | } | |
2029 | ||
2030 | // Return true for multi-GOT links. | |
2031 | bool | |
2032 | multi_got() const | |
2033 | { return this->primary_got_ != NULL; } | |
2034 | ||
2035 | // Return the offset of OBJECT's GOT from the start of .got section. | |
2036 | unsigned int | |
2037 | get_got_offset(const Mips_relobj<size, big_endian>* object) | |
2038 | { | |
2039 | if (!this->multi_got()) | |
2040 | return 0; | |
2041 | else | |
2042 | { | |
2043 | Mips_got_info<size, big_endian>* g = object->get_got_info(); | |
2044 | return g != NULL ? g->offset() : 0; | |
2045 | } | |
2046 | } | |
2047 | ||
2048 | // Create global GOT entries that should be in the GGA_RELOC_ONLY area. | |
2049 | void | |
2050 | add_reloc_only_entries() | |
2051 | { this->master_got_info_->add_reloc_only_entries(this); } | |
2052 | ||
2053 | // Return offset of the primary GOT's entry for global symbol. | |
2054 | unsigned int | |
2055 | get_primary_got_offset(const Mips_symbol<size>* sym) const | |
2056 | { | |
2057 | gold_assert(sym->global_got_area() != GGA_NONE); | |
2058 | return (this->get_local_gotno() + sym->dynsym_index() | |
2059 | - this->first_global_got_dynsym_index()) * size/8; | |
2060 | } | |
2061 | ||
2062 | // For the entry at offset GOT_OFFSET, return its offset from the gp. | |
2063 | // Input argument GOT_OFFSET is always global offset from the start of | |
2064 | // .got section, for both single and multi-GOT links. | |
2065 | // For single GOT links, this returns GOT_OFFSET - 0x7FF0. For multi-GOT | |
2066 | // links, the return value is object_got_offset - 0x7FF0, where | |
2067 | // object_got_offset is offset in the OBJECT's GOT. | |
2068 | int | |
2069 | gp_offset(unsigned int got_offset, | |
2070 | const Mips_relobj<size, big_endian>* object) const | |
2071 | { | |
2072 | return (this->address() + got_offset | |
2073 | - this->target_->adjusted_gp_value(object)); | |
2074 | } | |
2075 | ||
2076 | protected: | |
2077 | // Write out the GOT table. | |
2078 | void | |
2079 | do_write(Output_file*); | |
2080 | ||
2081 | private: | |
2082 | ||
2083 | // This class represent dynamic relocations that need to be applied by | |
2084 | // gold because we are using TLS relocations in a static link. | |
2085 | class Static_reloc | |
2086 | { | |
2087 | public: | |
2088 | Static_reloc(unsigned int got_offset, unsigned int r_type, | |
2089 | Mips_symbol<size>* gsym) | |
2090 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true) | |
2091 | { this->u_.global.symbol = gsym; } | |
2092 | ||
2093 | Static_reloc(unsigned int got_offset, unsigned int r_type, | |
2094 | Sized_relobj_file<size, big_endian>* relobj, unsigned int index) | |
2095 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false) | |
2096 | { | |
2097 | this->u_.local.relobj = relobj; | |
2098 | this->u_.local.index = index; | |
2099 | } | |
2100 | ||
2101 | // Return the GOT offset. | |
2102 | unsigned int | |
2103 | got_offset() const | |
2104 | { return this->got_offset_; } | |
2105 | ||
2106 | // Relocation type. | |
2107 | unsigned int | |
2108 | r_type() const | |
2109 | { return this->r_type_; } | |
2110 | ||
2111 | // Whether the symbol is global or not. | |
2112 | bool | |
2113 | symbol_is_global() const | |
2114 | { return this->symbol_is_global_; } | |
2115 | ||
2116 | // For a relocation against a global symbol, the global symbol. | |
2117 | Mips_symbol<size>* | |
2118 | symbol() const | |
2119 | { | |
2120 | gold_assert(this->symbol_is_global_); | |
2121 | return this->u_.global.symbol; | |
2122 | } | |
2123 | ||
2124 | // For a relocation against a local symbol, the defining object. | |
2125 | Sized_relobj_file<size, big_endian>* | |
2126 | relobj() const | |
2127 | { | |
2128 | gold_assert(!this->symbol_is_global_); | |
2129 | return this->u_.local.relobj; | |
2130 | } | |
2131 | ||
2132 | // For a relocation against a local symbol, the local symbol index. | |
2133 | unsigned int | |
2134 | index() const | |
2135 | { | |
2136 | gold_assert(!this->symbol_is_global_); | |
2137 | return this->u_.local.index; | |
2138 | } | |
2139 | ||
2140 | private: | |
2141 | // GOT offset of the entry to which this relocation is applied. | |
2142 | unsigned int got_offset_; | |
2143 | // Type of relocation. | |
2144 | unsigned int r_type_; | |
2145 | // Whether this relocation is against a global symbol. | |
2146 | bool symbol_is_global_; | |
2147 | // A global or local symbol. | |
2148 | union | |
2149 | { | |
2150 | struct | |
2151 | { | |
2152 | // For a global symbol, the symbol itself. | |
2153 | Mips_symbol<size>* symbol; | |
2154 | } global; | |
2155 | struct | |
2156 | { | |
2157 | // For a local symbol, the object defining object. | |
2158 | Sized_relobj_file<size, big_endian>* relobj; | |
2159 | // For a local symbol, the symbol index. | |
2160 | unsigned int index; | |
2161 | } local; | |
2162 | } u_; | |
2163 | }; | |
2164 | ||
2165 | // The target. | |
2166 | Target_mips<size, big_endian>* target_; | |
2167 | // The symbol table. | |
2168 | Symbol_table* symbol_table_; | |
2169 | // The layout. | |
2170 | Layout* layout_; | |
2171 | // Static relocs to be applied to the GOT. | |
2172 | std::vector<Static_reloc> static_relocs_; | |
2173 | // .got section view. | |
2174 | unsigned char* got_view_; | |
2175 | // The dynamic symbol table index of the first symbol with global GOT entry. | |
2176 | unsigned int first_global_got_dynsym_index_; | |
2177 | // The master GOT information. | |
2178 | Mips_got_info<size, big_endian>* master_got_info_; | |
2179 | // The primary GOT information. | |
2180 | Mips_got_info<size, big_endian>* primary_got_; | |
2181 | // Secondary GOT fixups. | |
2182 | std::vector<Static_reloc> secondary_got_relocs_; | |
2183 | }; | |
2184 | ||
2185 | // A class to handle LA25 stubs - non-PIC interface to a PIC function. There are | |
2186 | // two ways of creating these interfaces. The first is to add: | |
2187 | // | |
2188 | // lui $25,%hi(func) | |
2189 | // j func | |
2190 | // addiu $25,$25,%lo(func) | |
2191 | // | |
2192 | // to a separate trampoline section. The second is to add: | |
2193 | // | |
2194 | // lui $25,%hi(func) | |
2195 | // addiu $25,$25,%lo(func) | |
2196 | // | |
2197 | // immediately before a PIC function "func", but only if a function is at the | |
2198 | // beginning of the section, and the section is not too heavily aligned (i.e we | |
2199 | // would need to add no more than 2 nops before the stub.) | |
2200 | // | |
2201 | // We only create stubs of the first type. | |
2202 | ||
2203 | template<int size, bool big_endian> | |
2204 | class Mips_output_data_la25_stub : public Output_section_data | |
2205 | { | |
2206 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
2207 | ||
2208 | public: | |
2209 | Mips_output_data_la25_stub() | |
2210 | : Output_section_data(size == 32 ? 4 : 8), symbols_() | |
2211 | { } | |
2212 | ||
2213 | // Create LA25 stub for a symbol. | |
2214 | void | |
2215 | create_la25_stub(Symbol_table* symtab, Target_mips<size, big_endian>* target, | |
2216 | Mips_symbol<size>* gsym); | |
2217 | ||
2218 | // Return output address of a stub. | |
2219 | Mips_address | |
2220 | stub_address(const Mips_symbol<size>* sym) const | |
2221 | { | |
2222 | gold_assert(sym->has_la25_stub()); | |
2223 | return this->address() + sym->la25_stub_offset(); | |
2224 | } | |
2225 | ||
2226 | protected: | |
2227 | void | |
2228 | do_adjust_output_section(Output_section* os) | |
2229 | { os->set_entsize(0); } | |
2230 | ||
2231 | private: | |
2232 | // Template for standard LA25 stub. | |
2233 | static const uint32_t la25_stub_entry[]; | |
2234 | // Template for microMIPS LA25 stub. | |
2235 | static const uint32_t la25_stub_micromips_entry[]; | |
2236 | ||
2237 | // Set the final size. | |
2238 | void | |
2239 | set_final_data_size() | |
2240 | { this->set_data_size(this->symbols_.size() * 16); } | |
2241 | ||
2242 | // Create a symbol for SYM stub's value and size, to help make the | |
2243 | // disassembly easier to read. | |
2244 | void | |
2245 | create_stub_symbol(Mips_symbol<size>* sym, Symbol_table* symtab, | |
2246 | Target_mips<size, big_endian>* target, uint64_t symsize); | |
2247 | ||
2248 | // Write out the LA25 stub section. | |
2249 | void | |
2250 | do_write(Output_file*); | |
2251 | ||
2252 | // Symbols that have LA25 stubs. | |
2253 | Unordered_set<Mips_symbol<size>*> symbols_; | |
2254 | }; | |
2255 | ||
2256 | // A class to handle the PLT data. | |
2257 | ||
2258 | template<int size, bool big_endian> | |
2259 | class Mips_output_data_plt : public Output_section_data | |
2260 | { | |
2261 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
2262 | typedef Output_data_reloc<elfcpp::SHT_REL, true, | |
2263 | size, big_endian> Reloc_section; | |
2264 | ||
2265 | public: | |
2266 | // Create the PLT section. The ordinary .got section is an argument, | |
2267 | // since we need to refer to the start. | |
2268 | Mips_output_data_plt(Layout* layout, Output_data_space* got_plt, | |
2269 | Target_mips<size, big_endian>* target) | |
2270 | : Output_section_data(size == 32 ? 4 : 8), got_plt_(got_plt), symbols_(), | |
2271 | plt_mips_offset_(0), plt_comp_offset_(0), plt_header_size_(0), | |
2272 | target_(target) | |
2273 | { | |
2274 | this->rel_ = new Reloc_section(false); | |
2275 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
2276 | elfcpp::SHF_ALLOC, this->rel_, | |
2277 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
2278 | } | |
2279 | ||
2280 | // Add an entry to the PLT for a symbol referenced by r_type relocation. | |
2281 | void | |
2282 | add_entry(Mips_symbol<size>* gsym, unsigned int r_type); | |
2283 | ||
2284 | // Return the .rel.plt section data. | |
2285 | const Reloc_section* | |
2286 | rel_plt() const | |
2287 | { return this->rel_; } | |
2288 | ||
2289 | // Return the number of PLT entries. | |
2290 | unsigned int | |
2291 | entry_count() const | |
2292 | { return this->symbols_.size(); } | |
2293 | ||
2294 | // Return the offset of the first non-reserved PLT entry. | |
2295 | unsigned int | |
2296 | first_plt_entry_offset() const | |
2297 | { return sizeof(plt0_entry_o32); } | |
2298 | ||
2299 | // Return the size of a PLT entry. | |
2300 | unsigned int | |
2301 | plt_entry_size() const | |
2302 | { return sizeof(plt_entry); } | |
2303 | ||
2304 | // Set final PLT offsets. For each symbol, determine whether standard or | |
2305 | // compressed (MIPS16 or microMIPS) PLT entry is used. | |
2306 | void | |
2307 | set_plt_offsets(); | |
2308 | ||
2309 | // Return the offset of the first standard PLT entry. | |
2310 | unsigned int | |
2311 | first_mips_plt_offset() const | |
2312 | { return this->plt_header_size_; } | |
2313 | ||
2314 | // Return the offset of the first compressed PLT entry. | |
2315 | unsigned int | |
2316 | first_comp_plt_offset() const | |
2317 | { return this->plt_header_size_ + this->plt_mips_offset_; } | |
2318 | ||
2319 | // Return whether there are any standard PLT entries. | |
2320 | bool | |
2321 | has_standard_entries() const | |
2322 | { return this->plt_mips_offset_ > 0; } | |
2323 | ||
2324 | // Return the output address of standard PLT entry. | |
2325 | Mips_address | |
2326 | mips_entry_address(const Mips_symbol<size>* sym) const | |
2327 | { | |
2328 | gold_assert (sym->has_mips_plt_offset()); | |
2329 | return (this->address() + this->first_mips_plt_offset() | |
2330 | + sym->mips_plt_offset()); | |
2331 | } | |
2332 | ||
2333 | // Return the output address of compressed (MIPS16 or microMIPS) PLT entry. | |
2334 | Mips_address | |
2335 | comp_entry_address(const Mips_symbol<size>* sym) const | |
2336 | { | |
2337 | gold_assert (sym->has_comp_plt_offset()); | |
2338 | return (this->address() + this->first_comp_plt_offset() | |
2339 | + sym->comp_plt_offset()); | |
2340 | } | |
2341 | ||
2342 | protected: | |
2343 | void | |
2344 | do_adjust_output_section(Output_section* os) | |
2345 | { os->set_entsize(0); } | |
2346 | ||
2347 | // Write to a map file. | |
2348 | void | |
2349 | do_print_to_mapfile(Mapfile* mapfile) const | |
2350 | { mapfile->print_output_data(this, _(".plt")); } | |
2351 | ||
2352 | private: | |
2353 | // Template for the first PLT entry. | |
2354 | static const uint32_t plt0_entry_o32[]; | |
2355 | static const uint32_t plt0_entry_n32[]; | |
2356 | static const uint32_t plt0_entry_n64[]; | |
2357 | static const uint32_t plt0_entry_micromips_o32[]; | |
2358 | static const uint32_t plt0_entry_micromips32_o32[]; | |
2359 | ||
2360 | // Template for subsequent PLT entries. | |
2361 | static const uint32_t plt_entry[]; | |
2362 | static const uint32_t plt_entry_mips16_o32[]; | |
2363 | static const uint32_t plt_entry_micromips_o32[]; | |
2364 | static const uint32_t plt_entry_micromips32_o32[]; | |
2365 | ||
2366 | // Set the final size. | |
2367 | void | |
2368 | set_final_data_size() | |
2369 | { | |
2370 | this->set_data_size(this->plt_header_size_ + this->plt_mips_offset_ | |
2371 | + this->plt_comp_offset_); | |
2372 | } | |
2373 | ||
2374 | // Write out the PLT data. | |
2375 | void | |
2376 | do_write(Output_file*); | |
2377 | ||
2378 | // Return whether the plt header contains microMIPS code. For the sake of | |
2379 | // cache alignment always use a standard header whenever any standard entries | |
2380 | // are present even if microMIPS entries are present as well. This also lets | |
2381 | // the microMIPS header rely on the value of $v0 only set by microMIPS | |
2382 | // entries, for a small size reduction. | |
2383 | bool | |
2384 | is_plt_header_compressed() const | |
2385 | { | |
2386 | gold_assert(this->plt_mips_offset_ + this->plt_comp_offset_ != 0); | |
2387 | return this->target_->is_output_micromips() && this->plt_mips_offset_ == 0; | |
2388 | } | |
2389 | ||
2390 | // Return the size of the PLT header. | |
2391 | unsigned int | |
2392 | get_plt_header_size() const | |
2393 | { | |
2394 | if (this->target_->is_output_n64()) | |
2395 | return 4 * sizeof(plt0_entry_n64) / sizeof(plt0_entry_n64[0]); | |
2396 | else if (this->target_->is_output_n32()) | |
2397 | return 4 * sizeof(plt0_entry_n32) / sizeof(plt0_entry_n32[0]); | |
2398 | else if (!this->is_plt_header_compressed()) | |
2399 | return 4 * sizeof(plt0_entry_o32) / sizeof(plt0_entry_o32[0]); | |
2400 | else if (this->target_->use_32bit_micromips_instructions()) | |
2401 | return (2 * sizeof(plt0_entry_micromips32_o32) | |
2402 | / sizeof(plt0_entry_micromips32_o32[0])); | |
2403 | else | |
2404 | return (2 * sizeof(plt0_entry_micromips_o32) | |
2405 | / sizeof(plt0_entry_micromips_o32[0])); | |
2406 | } | |
2407 | ||
2408 | // Return the PLT header entry. | |
2409 | const uint32_t* | |
2410 | get_plt_header_entry() const | |
2411 | { | |
2412 | if (this->target_->is_output_n64()) | |
2413 | return plt0_entry_n64; | |
2414 | else if (this->target_->is_output_n32()) | |
2415 | return plt0_entry_n32; | |
2416 | else if (!this->is_plt_header_compressed()) | |
2417 | return plt0_entry_o32; | |
2418 | else if (this->target_->use_32bit_micromips_instructions()) | |
2419 | return plt0_entry_micromips32_o32; | |
2420 | else | |
2421 | return plt0_entry_micromips_o32; | |
2422 | } | |
2423 | ||
2424 | // Return the size of the standard PLT entry. | |
2425 | unsigned int | |
2426 | standard_plt_entry_size() const | |
2427 | { return 4 * sizeof(plt_entry) / sizeof(plt_entry[0]); } | |
2428 | ||
2429 | // Return the size of the compressed PLT entry. | |
2430 | unsigned int | |
2431 | compressed_plt_entry_size() const | |
2432 | { | |
2433 | gold_assert(!this->target_->is_output_newabi()); | |
2434 | ||
2435 | if (!this->target_->is_output_micromips()) | |
2436 | return (2 * sizeof(plt_entry_mips16_o32) | |
2437 | / sizeof(plt_entry_mips16_o32[0])); | |
2438 | else if (this->target_->use_32bit_micromips_instructions()) | |
2439 | return (2 * sizeof(plt_entry_micromips32_o32) | |
2440 | / sizeof(plt_entry_micromips32_o32[0])); | |
2441 | else | |
2442 | return (2 * sizeof(plt_entry_micromips_o32) | |
2443 | / sizeof(plt_entry_micromips_o32[0])); | |
2444 | } | |
2445 | ||
2446 | // The reloc section. | |
2447 | Reloc_section* rel_; | |
2448 | // The .got.plt section. | |
2449 | Output_data_space* got_plt_; | |
2450 | // Symbols that have PLT entry. | |
2451 | std::vector<Mips_symbol<size>*> symbols_; | |
2452 | // The offset of the next standard PLT entry to create. | |
2453 | unsigned int plt_mips_offset_; | |
2454 | // The offset of the next compressed PLT entry to create. | |
2455 | unsigned int plt_comp_offset_; | |
2456 | // The size of the PLT header in bytes. | |
2457 | unsigned int plt_header_size_; | |
2458 | // The target. | |
2459 | Target_mips<size, big_endian>* target_; | |
2460 | }; | |
2461 | ||
2462 | // A class to handle the .MIPS.stubs data. | |
2463 | ||
2464 | template<int size, bool big_endian> | |
2465 | class Mips_output_data_mips_stubs : public Output_section_data | |
2466 | { | |
2467 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
2468 | ||
2469 | public: | |
2470 | Mips_output_data_mips_stubs(Target_mips<size, big_endian>* target) | |
2471 | : Output_section_data(size == 32 ? 4 : 8), symbols_(), dynsym_count_(-1U), | |
2472 | stub_offsets_are_set_(false), target_(target) | |
2473 | { } | |
2474 | ||
2475 | // Create entry for a symbol. | |
2476 | void | |
2477 | make_entry(Mips_symbol<size>*); | |
2478 | ||
2479 | // Remove entry for a symbol. | |
2480 | void | |
2481 | remove_entry(Mips_symbol<size>* gsym); | |
2482 | ||
2483 | // Set stub offsets for symbols. This method expects that the number of | |
2484 | // entries in dynamic symbol table is set. | |
2485 | void | |
2486 | set_lazy_stub_offsets(); | |
2487 | ||
2488 | void | |
2489 | set_needs_dynsym_value(); | |
2490 | ||
2491 | // Set the number of entries in dynamic symbol table. | |
2492 | void | |
2493 | set_dynsym_count(unsigned int dynsym_count) | |
2494 | { this->dynsym_count_ = dynsym_count; } | |
2495 | ||
2496 | // Return maximum size of the stub, ie. the stub size if the dynamic symbol | |
2497 | // count is greater than 0x10000. If the dynamic symbol count is less than | |
2498 | // 0x10000, the stub will be 4 bytes smaller. | |
2499 | // There's no disadvantage from using microMIPS code here, so for the sake of | |
2500 | // pure-microMIPS binaries we prefer it whenever there's any microMIPS code in | |
2501 | // output produced at all. This has a benefit of stubs being shorter by | |
2502 | // 4 bytes each too, unless in the insn32 mode. | |
2503 | unsigned int | |
2504 | stub_max_size() const | |
2505 | { | |
2506 | if (!this->target_->is_output_micromips() | |
2507 | || this->target_->use_32bit_micromips_instructions()) | |
2508 | return 20; | |
2509 | else | |
2510 | return 16; | |
2511 | } | |
2512 | ||
2513 | // Return the size of the stub. This method expects that the final dynsym | |
2514 | // count is set. | |
2515 | unsigned int | |
2516 | stub_size() const | |
2517 | { | |
2518 | gold_assert(this->dynsym_count_ != -1U); | |
2519 | if (this->dynsym_count_ > 0x10000) | |
2520 | return this->stub_max_size(); | |
2521 | else | |
2522 | return this->stub_max_size() - 4; | |
2523 | } | |
2524 | ||
2525 | // Return output address of a stub. | |
2526 | Mips_address | |
2527 | stub_address(const Mips_symbol<size>* sym) const | |
2528 | { | |
2529 | gold_assert(sym->has_lazy_stub()); | |
2530 | return this->address() + sym->lazy_stub_offset(); | |
2531 | } | |
2532 | ||
2533 | protected: | |
2534 | void | |
2535 | do_adjust_output_section(Output_section* os) | |
2536 | { os->set_entsize(0); } | |
2537 | ||
2538 | // Write to a map file. | |
2539 | void | |
2540 | do_print_to_mapfile(Mapfile* mapfile) const | |
2541 | { mapfile->print_output_data(this, _(".MIPS.stubs")); } | |
2542 | ||
2543 | private: | |
2544 | static const uint32_t lazy_stub_normal_1[]; | |
2545 | static const uint32_t lazy_stub_normal_1_n64[]; | |
2546 | static const uint32_t lazy_stub_normal_2[]; | |
2547 | static const uint32_t lazy_stub_normal_2_n64[]; | |
2548 | static const uint32_t lazy_stub_big[]; | |
2549 | static const uint32_t lazy_stub_big_n64[]; | |
2550 | ||
2551 | static const uint32_t lazy_stub_micromips_normal_1[]; | |
2552 | static const uint32_t lazy_stub_micromips_normal_1_n64[]; | |
2553 | static const uint32_t lazy_stub_micromips_normal_2[]; | |
2554 | static const uint32_t lazy_stub_micromips_normal_2_n64[]; | |
2555 | static const uint32_t lazy_stub_micromips_big[]; | |
2556 | static const uint32_t lazy_stub_micromips_big_n64[]; | |
2557 | ||
2558 | static const uint32_t lazy_stub_micromips32_normal_1[]; | |
2559 | static const uint32_t lazy_stub_micromips32_normal_1_n64[]; | |
2560 | static const uint32_t lazy_stub_micromips32_normal_2[]; | |
2561 | static const uint32_t lazy_stub_micromips32_normal_2_n64[]; | |
2562 | static const uint32_t lazy_stub_micromips32_big[]; | |
2563 | static const uint32_t lazy_stub_micromips32_big_n64[]; | |
2564 | ||
2565 | // Set the final size. | |
2566 | void | |
2567 | set_final_data_size() | |
2568 | { this->set_data_size(this->symbols_.size() * this->stub_max_size()); } | |
2569 | ||
2570 | // Write out the .MIPS.stubs data. | |
2571 | void | |
2572 | do_write(Output_file*); | |
2573 | ||
2574 | // .MIPS.stubs symbols | |
2575 | Unordered_set<Mips_symbol<size>*> symbols_; | |
2576 | // Number of entries in dynamic symbol table. | |
2577 | unsigned int dynsym_count_; | |
2578 | // Whether the stub offsets are set. | |
2579 | bool stub_offsets_are_set_; | |
2580 | // The target. | |
2581 | Target_mips<size, big_endian>* target_; | |
2582 | }; | |
2583 | ||
2584 | // This class handles Mips .reginfo output section. | |
2585 | ||
2586 | template<int size, bool big_endian> | |
2587 | class Mips_output_section_reginfo : public Output_section | |
2588 | { | |
2589 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; | |
2590 | ||
2591 | public: | |
2592 | Mips_output_section_reginfo(const char* name, elfcpp::Elf_Word type, | |
2593 | elfcpp::Elf_Xword flags, | |
2594 | Target_mips<size, big_endian>* target) | |
2595 | : Output_section(name, type, flags), target_(target), gprmask_(0), | |
2596 | cprmask1_(0), cprmask2_(0), cprmask3_(0), cprmask4_(0) | |
2597 | { } | |
2598 | ||
2599 | // Downcast a base pointer to a Mips_output_section_reginfo pointer. | |
2600 | static Mips_output_section_reginfo<size, big_endian>* | |
2601 | as_mips_output_section_reginfo(Output_section* os) | |
2602 | { return static_cast<Mips_output_section_reginfo<size, big_endian>*>(os); } | |
2603 | ||
2604 | // Set masks of the output .reginfo section. | |
2605 | void | |
2606 | set_masks(Valtype gprmask, Valtype cprmask1, Valtype cprmask2, | |
2607 | Valtype cprmask3, Valtype cprmask4) | |
2608 | { | |
2609 | this->gprmask_ = gprmask; | |
2610 | this->cprmask1_ = cprmask1; | |
2611 | this->cprmask2_ = cprmask2; | |
2612 | this->cprmask3_ = cprmask3; | |
2613 | this->cprmask4_ = cprmask4; | |
2614 | } | |
2615 | ||
2616 | protected: | |
2617 | // Set the final data size. | |
2618 | void | |
2619 | set_final_data_size() | |
2620 | { this->set_data_size(24); } | |
2621 | ||
2622 | // Write out reginfo section. | |
2623 | void | |
2624 | do_write(Output_file* of); | |
2625 | ||
2626 | private: | |
2627 | Target_mips<size, big_endian>* target_; | |
2628 | ||
2629 | // gprmask of the output .reginfo section. | |
2630 | Valtype gprmask_; | |
2631 | // cprmask1 of the output .reginfo section. | |
2632 | Valtype cprmask1_; | |
2633 | // cprmask2 of the output .reginfo section. | |
2634 | Valtype cprmask2_; | |
2635 | // cprmask3 of the output .reginfo section. | |
2636 | Valtype cprmask3_; | |
2637 | // cprmask4 of the output .reginfo section. | |
2638 | Valtype cprmask4_; | |
2639 | }; | |
2640 | ||
2641 | // The MIPS target has relocation types which default handling of relocatable | |
2642 | // relocation cannot process. So we have to extend the default code. | |
2643 | ||
2644 | template<bool big_endian, int sh_type, typename Classify_reloc> | |
2645 | class Mips_scan_relocatable_relocs : | |
2646 | public Default_scan_relocatable_relocs<sh_type, Classify_reloc> | |
2647 | { | |
2648 | public: | |
2649 | // Return the strategy to use for a local symbol which is a section | |
2650 | // symbol, given the relocation type. | |
2651 | inline Relocatable_relocs::Reloc_strategy | |
2652 | local_section_strategy(unsigned int r_type, Relobj* object) | |
2653 | { | |
2654 | if (sh_type == elfcpp::SHT_RELA) | |
2655 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA; | |
2656 | else | |
2657 | { | |
2658 | switch (r_type) | |
2659 | { | |
2660 | case elfcpp::R_MIPS_26: | |
2661 | return Relocatable_relocs::RELOC_SPECIAL; | |
2662 | ||
2663 | default: | |
2664 | return Default_scan_relocatable_relocs<sh_type, Classify_reloc>:: | |
2665 | local_section_strategy(r_type, object); | |
2666 | } | |
2667 | } | |
2668 | } | |
2669 | }; | |
2670 | ||
2671 | // Mips_copy_relocs class. The only difference from the base class is the | |
2672 | // method emit_mips, which should be called instead of Copy_reloc_entry::emit. | |
2673 | // Mips cannot convert all relocation types to dynamic relocs. If a reloc | |
2674 | // cannot be made dynamic, a COPY reloc is emitted. | |
2675 | ||
2676 | template<int sh_type, int size, bool big_endian> | |
2677 | class Mips_copy_relocs : public Copy_relocs<sh_type, size, big_endian> | |
2678 | { | |
2679 | public: | |
2680 | Mips_copy_relocs() | |
2681 | : Copy_relocs<sh_type, size, big_endian>(elfcpp::R_MIPS_COPY) | |
2682 | { } | |
2683 | ||
2684 | // Emit any saved relocations which turn out to be needed. This is | |
2685 | // called after all the relocs have been scanned. | |
2686 | void | |
2687 | emit_mips(Output_data_reloc<sh_type, true, size, big_endian>*, | |
2688 | Symbol_table*, Layout*, Target_mips<size, big_endian>*); | |
2689 | ||
2690 | private: | |
2691 | typedef typename Copy_relocs<sh_type, size, big_endian>::Copy_reloc_entry | |
2692 | Copy_reloc_entry; | |
2693 | ||
2694 | // Emit this reloc if appropriate. This is called after we have | |
2695 | // scanned all the relocations, so we know whether we emitted a | |
2696 | // COPY relocation for SYM_. | |
2697 | void | |
2698 | emit_entry(Copy_reloc_entry& entry, | |
2699 | Output_data_reloc<sh_type, true, size, big_endian>* reloc_section, | |
2700 | Symbol_table* symtab, Layout* layout, | |
2701 | Target_mips<size, big_endian>* target); | |
2702 | }; | |
2703 | ||
2704 | ||
2705 | // Return true if the symbol SYM should be considered to resolve local | |
2706 | // to the current module, and false otherwise. The logic is taken from | |
2707 | // GNU ld's method _bfd_elf_symbol_refs_local_p. | |
2708 | static bool | |
2709 | symbol_refs_local(const Symbol* sym, bool has_dynsym_entry, | |
2710 | bool local_protected) | |
2711 | { | |
2712 | // If it's a local sym, of course we resolve locally. | |
2713 | if (sym == NULL) | |
2714 | return true; | |
2715 | ||
2716 | // STV_HIDDEN or STV_INTERNAL ones must be local. | |
2717 | if (sym->visibility() == elfcpp::STV_HIDDEN | |
2718 | || sym->visibility() == elfcpp::STV_INTERNAL) | |
2719 | return true; | |
2720 | ||
2721 | // If we don't have a definition in a regular file, then we can't | |
2722 | // resolve locally. The sym is either undefined or dynamic. | |
2723 | if (sym->source() != Symbol::FROM_OBJECT || sym->object()->is_dynamic() | |
2724 | || sym->is_undefined()) | |
2725 | return false; | |
2726 | ||
2727 | // Forced local symbols resolve locally. | |
2728 | if (sym->is_forced_local()) | |
2729 | return true; | |
2730 | ||
2731 | // As do non-dynamic symbols. | |
2732 | if (!has_dynsym_entry) | |
2733 | return true; | |
2734 | ||
2735 | // At this point, we know the symbol is defined and dynamic. In an | |
2736 | // executable it must resolve locally, likewise when building symbolic | |
2737 | // shared libraries. | |
2738 | if (parameters->options().output_is_executable() | |
2739 | || parameters->options().Bsymbolic()) | |
2740 | return true; | |
2741 | ||
2742 | // Now deal with defined dynamic symbols in shared libraries. Ones | |
2743 | // with default visibility might not resolve locally. | |
2744 | if (sym->visibility() == elfcpp::STV_DEFAULT) | |
2745 | return false; | |
2746 | ||
2747 | // STV_PROTECTED non-function symbols are local. | |
2748 | if (sym->type() != elfcpp::STT_FUNC) | |
2749 | return true; | |
2750 | ||
2751 | // Function pointer equality tests may require that STV_PROTECTED | |
2752 | // symbols be treated as dynamic symbols. If the address of a | |
2753 | // function not defined in an executable is set to that function's | |
2754 | // plt entry in the executable, then the address of the function in | |
2755 | // a shared library must also be the plt entry in the executable. | |
2756 | return local_protected; | |
2757 | } | |
2758 | ||
2759 | // Return TRUE if references to this symbol always reference the symbol in this | |
2760 | // object. | |
2761 | static bool | |
2762 | symbol_references_local(const Symbol* sym, bool has_dynsym_entry) | |
2763 | { | |
2764 | return symbol_refs_local(sym, has_dynsym_entry, false); | |
2765 | } | |
2766 | ||
2767 | // Return TRUE if calls to this symbol always call the version in this object. | |
2768 | static bool | |
2769 | symbol_calls_local(const Symbol* sym, bool has_dynsym_entry) | |
2770 | { | |
2771 | return symbol_refs_local(sym, has_dynsym_entry, true); | |
2772 | } | |
2773 | ||
2774 | // Compare GOT offsets of two symbols. | |
2775 | ||
2776 | template<int size, bool big_endian> | |
2777 | static bool | |
2778 | got_offset_compare(Symbol* sym1, Symbol* sym2) | |
2779 | { | |
2780 | Mips_symbol<size>* mips_sym1 = Mips_symbol<size>::as_mips_sym(sym1); | |
2781 | Mips_symbol<size>* mips_sym2 = Mips_symbol<size>::as_mips_sym(sym2); | |
2782 | unsigned int area1 = mips_sym1->global_got_area(); | |
2783 | unsigned int area2 = mips_sym2->global_got_area(); | |
2784 | gold_assert(area1 != GGA_NONE && area1 != GGA_NONE); | |
2785 | ||
2786 | // GGA_NORMAL entries always come before GGA_RELOC_ONLY. | |
2787 | if (area1 != area2) | |
2788 | return area1 < area2; | |
2789 | ||
2790 | return mips_sym1->global_gotoffset() < mips_sym2->global_gotoffset(); | |
2791 | } | |
2792 | ||
2793 | // This method divides dynamic symbols into symbols that have GOT entry, and | |
2794 | // symbols that don't have GOT entry. It also sorts symbols with the GOT entry. | |
2795 | // Mips ABI requires that symbols with the GOT entry must be at the end of | |
2796 | // dynamic symbol table, and the order in dynamic symbol table must match the | |
2797 | // order in GOT. | |
2798 | ||
2799 | template<int size, bool big_endian> | |
2800 | static void | |
2801 | reorder_dyn_symbols(std::vector<Symbol*>* dyn_symbols, | |
2802 | std::vector<Symbol*>* non_got_symbols, | |
2803 | std::vector<Symbol*>* got_symbols) | |
2804 | { | |
2805 | for (std::vector<Symbol*>::iterator p = dyn_symbols->begin(); | |
2806 | p != dyn_symbols->end(); | |
2807 | ++p) | |
2808 | { | |
2809 | Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(*p); | |
2810 | if (mips_sym->global_got_area() == GGA_NORMAL | |
2811 | || mips_sym->global_got_area() == GGA_RELOC_ONLY) | |
2812 | got_symbols->push_back(mips_sym); | |
2813 | else | |
2814 | non_got_symbols->push_back(mips_sym); | |
2815 | } | |
2816 | ||
2817 | std::sort(got_symbols->begin(), got_symbols->end(), | |
2818 | got_offset_compare<size, big_endian>); | |
2819 | } | |
2820 | ||
2821 | // Functor class for processing the global symbol table. | |
2822 | ||
2823 | template<int size, bool big_endian> | |
2824 | class Symbol_visitor_check_symbols | |
2825 | { | |
2826 | public: | |
2827 | Symbol_visitor_check_symbols(Target_mips<size, big_endian>* target, | |
2828 | Layout* layout, Symbol_table* symtab) | |
2829 | : target_(target), layout_(layout), symtab_(symtab) | |
2830 | { } | |
2831 | ||
2832 | void | |
2833 | operator()(Sized_symbol<size>* sym) | |
2834 | { | |
2835 | Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(sym); | |
2836 | if (local_pic_function<size, big_endian>(mips_sym)) | |
2837 | { | |
2838 | // SYM is a function that might need $25 to be valid on entry. | |
2839 | // If we're creating a non-PIC relocatable object, mark SYM as | |
2840 | // being PIC. If we're creating a non-relocatable object with | |
2841 | // non-PIC branches and jumps to SYM, make sure that SYM has an la25 | |
2842 | // stub. | |
2843 | if (parameters->options().relocatable()) | |
2844 | { | |
2845 | if (!parameters->options().output_is_position_independent()) | |
2846 | mips_sym->set_pic(); | |
2847 | } | |
2848 | else if (mips_sym->has_nonpic_branches()) | |
2849 | { | |
2850 | this->target_->la25_stub_section(layout_) | |
2851 | ->create_la25_stub(this->symtab_, this->target_, mips_sym); | |
2852 | } | |
2853 | } | |
2854 | } | |
2855 | ||
2856 | private: | |
2857 | Target_mips<size, big_endian>* target_; | |
2858 | Layout* layout_; | |
2859 | Symbol_table* symtab_; | |
2860 | }; | |
2861 | ||
2862 | template<int size, bool big_endian> | |
2863 | class Target_mips : public Sized_target<size, big_endian> | |
2864 | { | |
2865 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
2866 | typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> | |
2867 | Reloc_section; | |
2868 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> | |
2869 | Reloca_section; | |
2870 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype32; | |
2871 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; | |
2872 | ||
2873 | public: | |
2874 | Target_mips(const Target::Target_info* info = &mips_info) | |
2875 | : Sized_target<size, big_endian>(info), got_(NULL), gp_(NULL), plt_(NULL), | |
2876 | got_plt_(NULL), rel_dyn_(NULL), copy_relocs_(), | |
2877 | dyn_relocs_(), la25_stub_(NULL), mips_mach_extensions_(), | |
2878 | mips_stubs_(NULL), ei_class_(0), mach_(0), layout_(NULL), | |
2879 | got16_addends_(), entry_symbol_is_compressed_(false), insn32_(false) | |
2880 | { | |
2881 | this->add_machine_extensions(); | |
2882 | } | |
2883 | ||
2884 | // The offset of $gp from the beginning of the .got section. | |
2885 | static const unsigned int MIPS_GP_OFFSET = 0x7ff0; | |
2886 | ||
2887 | // The maximum size of the GOT for it to be addressable using 16-bit | |
2888 | // offsets from $gp. | |
2889 | static const unsigned int MIPS_GOT_MAX_SIZE = MIPS_GP_OFFSET + 0x7fff; | |
2890 | ||
2891 | // Make a new symbol table entry for the Mips target. | |
2892 | Sized_symbol<size>* | |
2893 | make_symbol() const | |
2894 | { return new Mips_symbol<size>(); } | |
2895 | ||
2896 | // Process the relocations to determine unreferenced sections for | |
2897 | // garbage collection. | |
2898 | void | |
2899 | gc_process_relocs(Symbol_table* symtab, | |
2900 | Layout* layout, | |
2901 | Sized_relobj_file<size, big_endian>* object, | |
2902 | unsigned int data_shndx, | |
2903 | unsigned int sh_type, | |
2904 | const unsigned char* prelocs, | |
2905 | size_t reloc_count, | |
2906 | Output_section* output_section, | |
2907 | bool needs_special_offset_handling, | |
2908 | size_t local_symbol_count, | |
2909 | const unsigned char* plocal_symbols); | |
2910 | ||
2911 | // Scan the relocations to look for symbol adjustments. | |
2912 | void | |
2913 | scan_relocs(Symbol_table* symtab, | |
2914 | Layout* layout, | |
2915 | Sized_relobj_file<size, big_endian>* object, | |
2916 | unsigned int data_shndx, | |
2917 | unsigned int sh_type, | |
2918 | const unsigned char* prelocs, | |
2919 | size_t reloc_count, | |
2920 | Output_section* output_section, | |
2921 | bool needs_special_offset_handling, | |
2922 | size_t local_symbol_count, | |
2923 | const unsigned char* plocal_symbols); | |
2924 | ||
2925 | // Finalize the sections. | |
2926 | void | |
2927 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); | |
2928 | ||
2929 | // Relocate a section. | |
2930 | void | |
2931 | relocate_section(const Relocate_info<size, big_endian>*, | |
2932 | unsigned int sh_type, | |
2933 | const unsigned char* prelocs, | |
2934 | size_t reloc_count, | |
2935 | Output_section* output_section, | |
2936 | bool needs_special_offset_handling, | |
2937 | unsigned char* view, | |
2938 | Mips_address view_address, | |
2939 | section_size_type view_size, | |
2940 | const Reloc_symbol_changes*); | |
2941 | ||
2942 | // Scan the relocs during a relocatable link. | |
2943 | void | |
2944 | scan_relocatable_relocs(Symbol_table* symtab, | |
2945 | Layout* layout, | |
2946 | Sized_relobj_file<size, big_endian>* object, | |
2947 | unsigned int data_shndx, | |
2948 | unsigned int sh_type, | |
2949 | const unsigned char* prelocs, | |
2950 | size_t reloc_count, | |
2951 | Output_section* output_section, | |
2952 | bool needs_special_offset_handling, | |
2953 | size_t local_symbol_count, | |
2954 | const unsigned char* plocal_symbols, | |
2955 | Relocatable_relocs*); | |
2956 | ||
2957 | // Emit relocations for a section. | |
2958 | void | |
2959 | relocate_relocs(const Relocate_info<size, big_endian>*, | |
2960 | unsigned int sh_type, | |
2961 | const unsigned char* prelocs, | |
2962 | size_t reloc_count, | |
2963 | Output_section* output_section, | |
2964 | typename elfcpp::Elf_types<size>::Elf_Off | |
2965 | offset_in_output_section, | |
2966 | const Relocatable_relocs*, | |
2967 | unsigned char* view, | |
2968 | Mips_address view_address, | |
2969 | section_size_type view_size, | |
2970 | unsigned char* reloc_view, | |
2971 | section_size_type reloc_view_size); | |
2972 | ||
2973 | // Perform target-specific processing in a relocatable link. This is | |
2974 | // only used if we use the relocation strategy RELOC_SPECIAL. | |
2975 | void | |
2976 | relocate_special_relocatable(const Relocate_info<size, big_endian>* relinfo, | |
2977 | unsigned int sh_type, | |
2978 | const unsigned char* preloc_in, | |
2979 | size_t relnum, | |
2980 | Output_section* output_section, | |
2981 | typename elfcpp::Elf_types<size>::Elf_Off | |
2982 | offset_in_output_section, | |
2983 | unsigned char* view, | |
2984 | Mips_address view_address, | |
2985 | section_size_type view_size, | |
2986 | unsigned char* preloc_out); | |
2987 | ||
2988 | // Return whether SYM is defined by the ABI. | |
2989 | bool | |
2990 | do_is_defined_by_abi(const Symbol* sym) const | |
2991 | { | |
2992 | return ((strcmp(sym->name(), "__gnu_local_gp") == 0) | |
2993 | || (strcmp(sym->name(), "_gp_disp") == 0) | |
2994 | || (strcmp(sym->name(), "___tls_get_addr") == 0)); | |
2995 | } | |
2996 | ||
2997 | // Return the number of entries in the GOT. | |
2998 | unsigned int | |
2999 | got_entry_count() const | |
3000 | { | |
3001 | if (!this->has_got_section()) | |
3002 | return 0; | |
3003 | return this->got_size() / (size/8); | |
3004 | } | |
3005 | ||
3006 | // Return the number of entries in the PLT. | |
3007 | unsigned int | |
3008 | plt_entry_count() const | |
3009 | { | |
3010 | if (this->plt_ == NULL) | |
3011 | return 0; | |
3012 | return this->plt_->entry_count(); | |
3013 | } | |
3014 | ||
3015 | // Return the offset of the first non-reserved PLT entry. | |
3016 | unsigned int | |
3017 | first_plt_entry_offset() const | |
3018 | { return this->plt_->first_plt_entry_offset(); } | |
3019 | ||
3020 | // Return the size of each PLT entry. | |
3021 | unsigned int | |
3022 | plt_entry_size() const | |
3023 | { return this->plt_->plt_entry_size(); } | |
3024 | ||
3025 | // Get the GOT section, creating it if necessary. | |
3026 | Mips_output_data_got<size, big_endian>* | |
3027 | got_section(Symbol_table*, Layout*); | |
3028 | ||
3029 | // Get the GOT section. | |
3030 | Mips_output_data_got<size, big_endian>* | |
3031 | got_section() const | |
3032 | { | |
3033 | gold_assert(this->got_ != NULL); | |
3034 | return this->got_; | |
3035 | } | |
3036 | ||
3037 | // Get the .MIPS.stubs section, creating it if necessary. | |
3038 | Mips_output_data_mips_stubs<size, big_endian>* | |
3039 | mips_stubs_section(Layout* layout); | |
3040 | ||
3041 | // Get the .MIPS.stubs section. | |
3042 | Mips_output_data_mips_stubs<size, big_endian>* | |
3043 | mips_stubs_section() const | |
3044 | { | |
3045 | gold_assert(this->mips_stubs_ != NULL); | |
3046 | return this->mips_stubs_; | |
3047 | } | |
3048 | ||
3049 | // Get the LA25 stub section, creating it if necessary. | |
3050 | Mips_output_data_la25_stub<size, big_endian>* | |
3051 | la25_stub_section(Layout*); | |
3052 | ||
3053 | // Get the LA25 stub section. | |
3054 | Mips_output_data_la25_stub<size, big_endian>* | |
3055 | la25_stub_section() | |
3056 | { | |
3057 | gold_assert(this->la25_stub_ != NULL); | |
3058 | return this->la25_stub_; | |
3059 | } | |
3060 | ||
3061 | // Get gp value. It has the value of .got + 0x7FF0. | |
3062 | Mips_address | |
3063 | gp_value() const | |
3064 | { | |
3065 | if (this->gp_ != NULL) | |
3066 | return this->gp_->value(); | |
3067 | return 0; | |
3068 | } | |
3069 | ||
3070 | // Get gp value. It has the value of .got + 0x7FF0. Adjust it for | |
3071 | // multi-GOT links so that OBJECT's GOT + 0x7FF0 is returned. | |
3072 | Mips_address | |
3073 | adjusted_gp_value(const Mips_relobj<size, big_endian>* object) | |
3074 | { | |
3075 | if (this->gp_ == NULL) | |
3076 | return 0; | |
3077 | ||
3078 | bool multi_got = false; | |
3079 | if (this->has_got_section()) | |
3080 | multi_got = this->got_section()->multi_got(); | |
3081 | if (!multi_got) | |
3082 | return this->gp_->value(); | |
3083 | else | |
3084 | return this->gp_->value() + this->got_section()->get_got_offset(object); | |
3085 | } | |
3086 | ||
3087 | // Get the dynamic reloc section, creating it if necessary. | |
3088 | Reloc_section* | |
3089 | rel_dyn_section(Layout*); | |
3090 | ||
3091 | bool | |
3092 | do_has_custom_set_dynsym_indexes() const | |
3093 | { return true; } | |
3094 | ||
3095 | // Don't emit input .reginfo sections to output .reginfo. | |
3096 | bool | |
3097 | do_should_include_section(elfcpp::Elf_Word sh_type) const | |
3098 | { return sh_type != elfcpp::SHT_MIPS_REGINFO; } | |
3099 | ||
3100 | // Set the dynamic symbol indexes. INDEX is the index of the first | |
3101 | // global dynamic symbol. Pointers to the symbols are stored into the | |
3102 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
3103 | // updated dynamic symbol index. | |
3104 | unsigned int | |
3105 | do_set_dynsym_indexes(std::vector<Symbol*>* dyn_symbols, unsigned int index, | |
3106 | std::vector<Symbol*>* syms, Stringpool* dynpool, | |
3107 | Versions* versions, Symbol_table* symtab) const; | |
3108 | ||
3109 | // Remove .MIPS.stubs entry for a symbol. | |
3110 | void | |
3111 | remove_lazy_stub_entry(Mips_symbol<size>* sym) | |
3112 | { | |
3113 | if (this->mips_stubs_ != NULL) | |
3114 | this->mips_stubs_->remove_entry(sym); | |
3115 | } | |
3116 | ||
3117 | // The value to write into got[1] for SVR4 targets, to identify it is | |
3118 | // a GNU object. The dynamic linker can then use got[1] to store the | |
3119 | // module pointer. | |
3120 | uint64_t | |
3121 | mips_elf_gnu_got1_mask() | |
3122 | { | |
3123 | if (this->is_output_n64()) | |
3124 | return (uint64_t)1 << 63; | |
3125 | else | |
3126 | return 1 << 31; | |
3127 | } | |
3128 | ||
3129 | // Whether the output has microMIPS code. This is valid only after | |
3130 | // merge_processor_specific_flags() is called. | |
3131 | bool | |
3132 | is_output_micromips() const | |
3133 | { | |
3134 | gold_assert(this->are_processor_specific_flags_set()); | |
3135 | return elfcpp::is_micromips(this->processor_specific_flags()); | |
3136 | } | |
3137 | ||
3138 | // Whether the output uses N32 ABI. This is valid only after | |
3139 | // merge_processor_specific_flags() is called. | |
3140 | bool | |
3141 | is_output_n32() const | |
3142 | { | |
3143 | gold_assert(this->are_processor_specific_flags_set()); | |
3144 | return elfcpp::abi_n32(this->processor_specific_flags()); | |
3145 | } | |
3146 | ||
3147 | // Whether the output uses N64 ABI. This is valid only after | |
3148 | // merge_processor_specific_flags() is called. | |
3149 | bool | |
3150 | is_output_n64() const | |
3151 | { | |
3152 | gold_assert(this->are_processor_specific_flags_set()); | |
3153 | return elfcpp::abi_64(this->ei_class_); | |
3154 | } | |
3155 | ||
3156 | // Whether the output uses NEWABI. This is valid only after | |
3157 | // merge_processor_specific_flags() is called. | |
3158 | bool | |
3159 | is_output_newabi() const | |
3160 | { return this->is_output_n32() || this->is_output_n64(); } | |
3161 | ||
3162 | // Whether we can only use 32-bit microMIPS instructions. | |
3163 | bool | |
3164 | use_32bit_micromips_instructions() const | |
3165 | { return this->insn32_; } | |
3166 | ||
3167 | protected: | |
3168 | // Return the value to use for a dynamic symbol which requires special | |
3169 | // treatment. This is how we support equality comparisons of function | |
3170 | // pointers across shared library boundaries, as described in the | |
3171 | // processor specific ABI supplement. | |
3172 | uint64_t | |
3173 | do_dynsym_value(const Symbol* gsym) const; | |
3174 | ||
3175 | // Make an ELF object. | |
3176 | Object* | |
3177 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
3178 | const elfcpp::Ehdr<size, big_endian>& ehdr); | |
3179 | ||
3180 | Object* | |
3181 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
3182 | const elfcpp::Ehdr<size, !big_endian>&) | |
3183 | { gold_unreachable(); } | |
3184 | ||
3185 | // Make an output section. | |
3186 | Output_section* | |
3187 | do_make_output_section(const char* name, elfcpp::Elf_Word type, | |
3188 | elfcpp::Elf_Xword flags) | |
3189 | { | |
3190 | if (type == elfcpp::SHT_MIPS_REGINFO) | |
3191 | return new Mips_output_section_reginfo<size, big_endian>(name, type, | |
3192 | flags, this); | |
3193 | else | |
3194 | return new Output_section(name, type, flags); | |
3195 | } | |
3196 | ||
3197 | // Adjust ELF file header. | |
3198 | void | |
3199 | do_adjust_elf_header(unsigned char* view, int len); | |
3200 | ||
3201 | // Get the custom dynamic tag value. | |
3202 | unsigned int | |
3203 | do_dynamic_tag_custom_value(elfcpp::DT) const; | |
3204 | ||
3205 | // Adjust the value written to the dynamic symbol table. | |
3206 | virtual void | |
3207 | do_adjust_dyn_symbol(const Symbol* sym, unsigned char* view) const | |
3208 | { | |
3209 | elfcpp::Sym<size, big_endian> isym(view); | |
3210 | elfcpp::Sym_write<size, big_endian> osym(view); | |
3211 | const Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(sym); | |
3212 | ||
3213 | // Keep dynamic compressed symbols odd. This allows the dynamic linker | |
3214 | // to treat compressed symbols like any other. | |
3215 | Mips_address value = isym.get_st_value(); | |
3216 | if (mips_sym->is_mips16() && value != 0) | |
3217 | { | |
3218 | if (!mips_sym->has_mips16_fn_stub()) | |
3219 | value |= 1; | |
3220 | else | |
3221 | { | |
3222 | // If we have a MIPS16 function with a stub, the dynamic symbol | |
3223 | // must refer to the stub, since only the stub uses the standard | |
3224 | // calling conventions. Stub contains MIPS32 code, so don't add +1 | |
3225 | // in this case. | |
3226 | ||
3227 | // There is a code which does this in the method | |
3228 | // Target_mips::do_dynsym_value, but that code will only be | |
3229 | // executed if the symbol is from dynobj. | |
3230 | // TODO(sasa): GNU ld also changes the value in non-dynamic symbol | |
3231 | // table. | |
3232 | ||
3233 | Mips16_stub_section<size, big_endian>* fn_stub = | |
3234 | mips_sym->template get_mips16_fn_stub<big_endian>(); | |
3235 | value = fn_stub->output_address(); | |
3236 | osym.put_st_size(fn_stub->section_size()); | |
3237 | } | |
3238 | ||
3239 | osym.put_st_value(value); | |
3240 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), | |
3241 | mips_sym->nonvis() - (elfcpp::STO_MIPS16 >> 2))); | |
3242 | } | |
3243 | else if ((mips_sym->is_micromips() | |
3244 | // Stubs are always microMIPS if there is any microMIPS code in | |
3245 | // the output. | |
3246 | || (this->is_output_micromips() && mips_sym->has_lazy_stub())) | |
3247 | && value != 0) | |
3248 | { | |
3249 | osym.put_st_value(value | 1); | |
3250 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), | |
3251 | mips_sym->nonvis() - (elfcpp::STO_MICROMIPS >> 2))); | |
3252 | } | |
3253 | } | |
3254 | ||
3255 | private: | |
3256 | // The class which scans relocations. | |
3257 | class Scan | |
3258 | { | |
3259 | public: | |
3260 | Scan() | |
3261 | { } | |
3262 | ||
3263 | static inline int | |
3264 | get_reference_flags(unsigned int r_type); | |
3265 | ||
3266 | inline void | |
3267 | local(Symbol_table* symtab, Layout* layout, Target_mips* target, | |
3268 | Sized_relobj_file<size, big_endian>* object, | |
3269 | unsigned int data_shndx, | |
3270 | Output_section* output_section, | |
3271 | const elfcpp::Rel<size, big_endian>& reloc, unsigned int r_type, | |
3272 | const elfcpp::Sym<size, big_endian>& lsym, | |
3273 | bool is_discarded); | |
3274 | ||
3275 | inline void | |
3276 | local(Symbol_table* symtab, Layout* layout, Target_mips* target, | |
3277 | Sized_relobj_file<size, big_endian>* object, | |
3278 | unsigned int data_shndx, | |
3279 | Output_section* output_section, | |
3280 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, | |
3281 | const elfcpp::Sym<size, big_endian>& lsym, | |
3282 | bool is_discarded); | |
3283 | ||
3284 | inline void | |
3285 | local(Symbol_table* symtab, Layout* layout, Target_mips* target, | |
3286 | Sized_relobj_file<size, big_endian>* object, | |
3287 | unsigned int data_shndx, | |
3288 | Output_section* output_section, | |
3289 | const elfcpp::Rela<size, big_endian>* rela, | |
3290 | const elfcpp::Rel<size, big_endian>* rel, | |
3291 | unsigned int rel_type, | |
3292 | unsigned int r_type, | |
3293 | const elfcpp::Sym<size, big_endian>& lsym, | |
3294 | bool is_discarded); | |
3295 | ||
3296 | inline void | |
3297 | global(Symbol_table* symtab, Layout* layout, Target_mips* target, | |
3298 | Sized_relobj_file<size, big_endian>* object, | |
3299 | unsigned int data_shndx, | |
3300 | Output_section* output_section, | |
3301 | const elfcpp::Rel<size, big_endian>& reloc, unsigned int r_type, | |
3302 | Symbol* gsym); | |
3303 | ||
3304 | inline void | |
3305 | global(Symbol_table* symtab, Layout* layout, Target_mips* target, | |
3306 | Sized_relobj_file<size, big_endian>* object, | |
3307 | unsigned int data_shndx, | |
3308 | Output_section* output_section, | |
3309 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, | |
3310 | Symbol* gsym); | |
3311 | ||
3312 | inline void | |
3313 | global(Symbol_table* symtab, Layout* layout, Target_mips* target, | |
3314 | Sized_relobj_file<size, big_endian>* object, | |
3315 | unsigned int data_shndx, | |
3316 | Output_section* output_section, | |
3317 | const elfcpp::Rela<size, big_endian>* rela, | |
3318 | const elfcpp::Rel<size, big_endian>* rel, | |
3319 | unsigned int rel_type, | |
3320 | unsigned int r_type, | |
3321 | Symbol* gsym); | |
3322 | ||
3323 | inline bool | |
3324 | local_reloc_may_be_function_pointer(Symbol_table* , Layout*, | |
3325 | Target_mips*, | |
3326 | Sized_relobj_file<size, big_endian>*, | |
3327 | unsigned int, | |
3328 | Output_section*, | |
3329 | const elfcpp::Rel<size, big_endian>&, | |
3330 | unsigned int, | |
3331 | const elfcpp::Sym<size, big_endian>&) | |
3332 | { return false; } | |
3333 | ||
3334 | inline bool | |
3335 | global_reloc_may_be_function_pointer(Symbol_table*, Layout*, | |
3336 | Target_mips*, | |
3337 | Sized_relobj_file<size, big_endian>*, | |
3338 | unsigned int, | |
3339 | Output_section*, | |
3340 | const elfcpp::Rel<size, big_endian>&, | |
3341 | unsigned int, Symbol*) | |
3342 | { return false; } | |
3343 | ||
3344 | inline bool | |
3345 | local_reloc_may_be_function_pointer(Symbol_table*, Layout*, | |
3346 | Target_mips*, | |
3347 | Sized_relobj_file<size, big_endian>*, | |
3348 | unsigned int, | |
3349 | Output_section*, | |
3350 | const elfcpp::Rela<size, big_endian>&, | |
3351 | unsigned int, | |
3352 | const elfcpp::Sym<size, big_endian>&) | |
3353 | { return false; } | |
3354 | ||
3355 | inline bool | |
3356 | global_reloc_may_be_function_pointer(Symbol_table*, Layout*, | |
3357 | Target_mips*, | |
3358 | Sized_relobj_file<size, big_endian>*, | |
3359 | unsigned int, | |
3360 | Output_section*, | |
3361 | const elfcpp::Rela<size, big_endian>&, | |
3362 | unsigned int, Symbol*) | |
3363 | { return false; } | |
3364 | private: | |
3365 | static void | |
3366 | unsupported_reloc_local(Sized_relobj_file<size, big_endian>*, | |
3367 | unsigned int r_type); | |
3368 | ||
3369 | static void | |
3370 | unsupported_reloc_global(Sized_relobj_file<size, big_endian>*, | |
3371 | unsigned int r_type, Symbol*); | |
3372 | }; | |
3373 | ||
3374 | // The class which implements relocation. | |
3375 | class Relocate | |
3376 | { | |
3377 | public: | |
3378 | Relocate() | |
3379 | { } | |
3380 | ||
3381 | ~Relocate() | |
3382 | { } | |
3383 | ||
3384 | // Return whether the R_MIPS_32 relocation needs to be applied. | |
3385 | inline bool | |
3386 | should_apply_r_mips_32_reloc(const Mips_symbol<size>* gsym, | |
3387 | unsigned int r_type, | |
3388 | Output_section* output_section, | |
3389 | Target_mips* target); | |
3390 | ||
3391 | // Do a relocation. Return false if the caller should not issue | |
3392 | // any warnings about this relocation. | |
3393 | inline bool | |
3394 | relocate(const Relocate_info<size, big_endian>*, Target_mips*, | |
3395 | Output_section*, size_t relnum, | |
3396 | const elfcpp::Rela<size, big_endian>*, | |
3397 | const elfcpp::Rel<size, big_endian>*, | |
3398 | unsigned int, | |
3399 | unsigned int, const Sized_symbol<size>*, | |
3400 | const Symbol_value<size>*, | |
3401 | unsigned char*, | |
3402 | Mips_address, | |
3403 | section_size_type); | |
3404 | ||
3405 | inline bool | |
3406 | relocate(const Relocate_info<size, big_endian>*, Target_mips*, | |
3407 | Output_section*, size_t relnum, | |
3408 | const elfcpp::Rel<size, big_endian>&, | |
3409 | unsigned int, const Sized_symbol<size>*, | |
3410 | const Symbol_value<size>*, | |
3411 | unsigned char*, | |
3412 | Mips_address, | |
3413 | section_size_type); | |
3414 | ||
3415 | inline bool | |
3416 | relocate(const Relocate_info<size, big_endian>*, Target_mips*, | |
3417 | Output_section*, size_t relnum, | |
3418 | const elfcpp::Rela<size, big_endian>&, | |
3419 | unsigned int, const Sized_symbol<size>*, | |
3420 | const Symbol_value<size>*, | |
3421 | unsigned char*, | |
3422 | Mips_address, | |
3423 | section_size_type); | |
3424 | }; | |
3425 | ||
3426 | // A class which returns the size required for a relocation type, | |
3427 | // used while scanning relocs during a relocatable link. | |
3428 | class Relocatable_size_for_reloc | |
3429 | { | |
3430 | public: | |
3431 | unsigned int | |
3432 | get_size_for_reloc(unsigned int, Relobj*); | |
3433 | }; | |
3434 | ||
3435 | // This POD class holds the dynamic relocations that should be emitted instead | |
3436 | // of R_MIPS_32, R_MIPS_REL32 and R_MIPS_64 relocations. We will emit these | |
3437 | // relocations if it turns out that the symbol does not have static | |
3438 | // relocations. | |
3439 | class Dyn_reloc | |
3440 | { | |
3441 | public: | |
3442 | Dyn_reloc(Mips_symbol<size>* sym, unsigned int r_type, | |
3443 | Mips_relobj<size, big_endian>* relobj, unsigned int shndx, | |
3444 | Output_section* output_section, Mips_address r_offset) | |
3445 | : sym_(sym), r_type_(r_type), relobj_(relobj), | |
3446 | shndx_(shndx), output_section_(output_section), | |
3447 | r_offset_(r_offset) | |
3448 | { } | |
3449 | ||
3450 | // Emit this reloc if appropriate. This is called after we have | |
3451 | // scanned all the relocations, so we know whether the symbol has | |
3452 | // static relocations. | |
3453 | void | |
3454 | emit(Reloc_section* rel_dyn, Mips_output_data_got<size, big_endian>* got, | |
3455 | Symbol_table* symtab) | |
3456 | { | |
3457 | if (!this->sym_->has_static_relocs()) | |
3458 | { | |
3459 | got->record_global_got_symbol(this->sym_, this->relobj_, | |
3460 | this->r_type_, true, false); | |
3461 | if (!symbol_references_local(this->sym_, | |
3462 | this->sym_->should_add_dynsym_entry(symtab))) | |
3463 | rel_dyn->add_global(this->sym_, this->r_type_, | |
3464 | this->output_section_, this->relobj_, | |
3465 | this->shndx_, this->r_offset_); | |
3466 | else | |
3467 | rel_dyn->add_symbolless_global_addend(this->sym_, this->r_type_, | |
3468 | this->output_section_, this->relobj_, | |
3469 | this->shndx_, this->r_offset_); | |
3470 | } | |
3471 | } | |
3472 | ||
3473 | private: | |
3474 | Mips_symbol<size>* sym_; | |
3475 | unsigned int r_type_; | |
3476 | Mips_relobj<size, big_endian>* relobj_; | |
3477 | unsigned int shndx_; | |
3478 | Output_section* output_section_; | |
3479 | Mips_address r_offset_; | |
3480 | }; | |
3481 | ||
3482 | // Adjust TLS relocation type based on the options and whether this | |
3483 | // is a local symbol. | |
3484 | static tls::Tls_optimization | |
3485 | optimize_tls_reloc(bool is_final, int r_type); | |
3486 | ||
3487 | // Return whether there is a GOT section. | |
3488 | bool | |
3489 | has_got_section() const | |
3490 | { return this->got_ != NULL; } | |
3491 | ||
3492 | // Check whether the given ELF header flags describe a 32-bit binary. | |
3493 | bool | |
3494 | mips_32bit_flags(elfcpp::Elf_Word); | |
3495 | ||
3496 | enum Mips_mach { | |
3497 | mach_mips3000 = 3000, | |
3498 | mach_mips3900 = 3900, | |
3499 | mach_mips4000 = 4000, | |
3500 | mach_mips4010 = 4010, | |
3501 | mach_mips4100 = 4100, | |
3502 | mach_mips4111 = 4111, | |
3503 | mach_mips4120 = 4120, | |
3504 | mach_mips4300 = 4300, | |
3505 | mach_mips4400 = 4400, | |
3506 | mach_mips4600 = 4600, | |
3507 | mach_mips4650 = 4650, | |
3508 | mach_mips5000 = 5000, | |
3509 | mach_mips5400 = 5400, | |
3510 | mach_mips5500 = 5500, | |
3511 | mach_mips6000 = 6000, | |
3512 | mach_mips7000 = 7000, | |
3513 | mach_mips8000 = 8000, | |
3514 | mach_mips9000 = 9000, | |
3515 | mach_mips10000 = 10000, | |
3516 | mach_mips12000 = 12000, | |
3517 | mach_mips14000 = 14000, | |
3518 | mach_mips16000 = 16000, | |
3519 | mach_mips16 = 16, | |
3520 | mach_mips5 = 5, | |
3521 | mach_mips_loongson_2e = 3001, | |
3522 | mach_mips_loongson_2f = 3002, | |
3523 | mach_mips_loongson_3a = 3003, | |
3524 | mach_mips_sb1 = 12310201, // octal 'SB', 01 | |
3525 | mach_mips_octeon = 6501, | |
3526 | mach_mips_octeonp = 6601, | |
3527 | mach_mips_octeon2 = 6502, | |
3528 | mach_mips_xlr = 887682, // decimal 'XLR' | |
3529 | mach_mipsisa32 = 32, | |
3530 | mach_mipsisa32r2 = 33, | |
3531 | mach_mipsisa64 = 64, | |
3532 | mach_mipsisa64r2 = 65, | |
3533 | mach_mips_micromips = 96 | |
3534 | }; | |
3535 | ||
3536 | // Return the MACH for a MIPS e_flags value. | |
3537 | unsigned int | |
3538 | elf_mips_mach(elfcpp::Elf_Word); | |
3539 | ||
3540 | // Check whether machine EXTENSION is an extension of machine BASE. | |
3541 | bool | |
3542 | mips_mach_extends(unsigned int, unsigned int); | |
3543 | ||
3544 | // Merge processor specific flags. | |
3545 | void | |
3546 | merge_processor_specific_flags(const std::string&, elfcpp::Elf_Word, | |
3547 | unsigned char, bool); | |
3548 | ||
3549 | // True if we are linking for CPUs that are faster if JAL is converted to BAL. | |
3550 | static inline bool | |
3551 | jal_to_bal() | |
3552 | { return false; } | |
3553 | ||
3554 | // True if we are linking for CPUs that are faster if JALR is converted to | |
3555 | // BAL. This should be safe for all architectures. We enable this predicate | |
3556 | // for all CPUs. | |
3557 | static inline bool | |
3558 | jalr_to_bal() | |
3559 | { return true; } | |
3560 | ||
3561 | // True if we are linking for CPUs that are faster if JR is converted to B. | |
3562 | // This should be safe for all architectures. We enable this predicate for | |
3563 | // all CPUs. | |
3564 | static inline bool | |
3565 | jr_to_b() | |
3566 | { return true; } | |
3567 | ||
3568 | // Return the size of the GOT section. | |
3569 | section_size_type | |
3570 | got_size() const | |
3571 | { | |
3572 | gold_assert(this->got_ != NULL); | |
3573 | return this->got_->data_size(); | |
3574 | } | |
3575 | ||
3576 | // Create a PLT entry for a global symbol referenced by r_type relocation. | |
3577 | void | |
3578 | make_plt_entry(Symbol_table*, Layout*, Mips_symbol<size>*, | |
3579 | unsigned int r_type); | |
3580 | ||
3581 | // Get the PLT section. | |
3582 | Mips_output_data_plt<size, big_endian>* | |
3583 | plt_section() const | |
3584 | { | |
3585 | gold_assert(this->plt_ != NULL); | |
3586 | return this->plt_; | |
3587 | } | |
3588 | ||
3589 | // Get the GOT PLT section. | |
3590 | const Mips_output_data_plt<size, big_endian>* | |
3591 | got_plt_section() const | |
3592 | { | |
3593 | gold_assert(this->got_plt_ != NULL); | |
3594 | return this->got_plt_; | |
3595 | } | |
3596 | ||
3597 | // Copy a relocation against a global symbol. | |
3598 | void | |
3599 | copy_reloc(Symbol_table* symtab, Layout* layout, | |
3600 | Sized_relobj_file<size, big_endian>* object, | |
3601 | unsigned int shndx, Output_section* output_section, | |
3602 | Symbol* sym, const elfcpp::Rel<size, big_endian>& reloc) | |
3603 | { | |
3604 | this->copy_relocs_.copy_reloc(symtab, layout, | |
3605 | symtab->get_sized_symbol<size>(sym), | |
3606 | object, shndx, output_section, | |
3607 | reloc, this->rel_dyn_section(layout)); | |
3608 | } | |
3609 | ||
3610 | void | |
3611 | dynamic_reloc(Mips_symbol<size>* sym, unsigned int r_type, | |
3612 | Mips_relobj<size, big_endian>* relobj, | |
3613 | unsigned int shndx, Output_section* output_section, | |
3614 | Mips_address r_offset) | |
3615 | { | |
3616 | this->dyn_relocs_.push_back(Dyn_reloc(sym, r_type, relobj, shndx, | |
3617 | output_section, r_offset)); | |
3618 | } | |
3619 | ||
3620 | // Calculate value of _gp symbol. | |
3621 | void | |
3622 | set_gp(Layout*, Symbol_table*); | |
3623 | ||
3624 | const char* | |
3625 | elf_mips_abi_name(elfcpp::Elf_Word e_flags, unsigned char ei_class); | |
3626 | const char* | |
3627 | elf_mips_mach_name(elfcpp::Elf_Word e_flags); | |
3628 | ||
3629 | // Adds entries that describe how machines relate to one another. The entries | |
3630 | // are ordered topologically with MIPS I extensions listed last. First | |
3631 | // element is extension, second element is base. | |
3632 | void | |
3633 | add_machine_extensions() | |
3634 | { | |
3635 | // MIPS64r2 extensions. | |
3636 | this->add_extension(mach_mips_octeon2, mach_mips_octeonp); | |
3637 | this->add_extension(mach_mips_octeonp, mach_mips_octeon); | |
3638 | this->add_extension(mach_mips_octeon, mach_mipsisa64r2); | |
3639 | ||
3640 | // MIPS64 extensions. | |
3641 | this->add_extension(mach_mipsisa64r2, mach_mipsisa64); | |
3642 | this->add_extension(mach_mips_sb1, mach_mipsisa64); | |
3643 | this->add_extension(mach_mips_xlr, mach_mipsisa64); | |
3644 | this->add_extension(mach_mips_loongson_3a, mach_mipsisa64); | |
3645 | ||
3646 | // MIPS V extensions. | |
3647 | this->add_extension(mach_mipsisa64, mach_mips5); | |
3648 | ||
3649 | // R10000 extensions. | |
3650 | this->add_extension(mach_mips12000, mach_mips10000); | |
3651 | this->add_extension(mach_mips14000, mach_mips10000); | |
3652 | this->add_extension(mach_mips16000, mach_mips10000); | |
3653 | ||
3654 | // R5000 extensions. Note: the vr5500 ISA is an extension of the core | |
3655 | // vr5400 ISA, but doesn't include the multimedia stuff. It seems | |
3656 | // better to allow vr5400 and vr5500 code to be merged anyway, since | |
3657 | // many libraries will just use the core ISA. Perhaps we could add | |
3658 | // some sort of ASE flag if this ever proves a problem. | |
3659 | this->add_extension(mach_mips5500, mach_mips5400); | |
3660 | this->add_extension(mach_mips5400, mach_mips5000); | |
3661 | ||
3662 | // MIPS IV extensions. | |
3663 | this->add_extension(mach_mips5, mach_mips8000); | |
3664 | this->add_extension(mach_mips10000, mach_mips8000); | |
3665 | this->add_extension(mach_mips5000, mach_mips8000); | |
3666 | this->add_extension(mach_mips7000, mach_mips8000); | |
3667 | this->add_extension(mach_mips9000, mach_mips8000); | |
3668 | ||
3669 | // VR4100 extensions. | |
3670 | this->add_extension(mach_mips4120, mach_mips4100); | |
3671 | this->add_extension(mach_mips4111, mach_mips4100); | |
3672 | ||
3673 | // MIPS III extensions. | |
3674 | this->add_extension(mach_mips_loongson_2e, mach_mips4000); | |
3675 | this->add_extension(mach_mips_loongson_2f, mach_mips4000); | |
3676 | this->add_extension(mach_mips8000, mach_mips4000); | |
3677 | this->add_extension(mach_mips4650, mach_mips4000); | |
3678 | this->add_extension(mach_mips4600, mach_mips4000); | |
3679 | this->add_extension(mach_mips4400, mach_mips4000); | |
3680 | this->add_extension(mach_mips4300, mach_mips4000); | |
3681 | this->add_extension(mach_mips4100, mach_mips4000); | |
3682 | this->add_extension(mach_mips4010, mach_mips4000); | |
3683 | ||
3684 | // MIPS32 extensions. | |
3685 | this->add_extension(mach_mipsisa32r2, mach_mipsisa32); | |
3686 | ||
3687 | // MIPS II extensions. | |
3688 | this->add_extension(mach_mips4000, mach_mips6000); | |
3689 | this->add_extension(mach_mipsisa32, mach_mips6000); | |
3690 | ||
3691 | // MIPS I extensions. | |
3692 | this->add_extension(mach_mips6000, mach_mips3000); | |
3693 | this->add_extension(mach_mips3900, mach_mips3000); | |
3694 | } | |
3695 | ||
3696 | // Add value to MIPS extenstions. | |
3697 | void | |
3698 | add_extension(unsigned int base, unsigned int extension) | |
3699 | { | |
3700 | std::pair<unsigned int, unsigned int> ext(base, extension); | |
3701 | this->mips_mach_extensions_.push_back(ext); | |
3702 | } | |
3703 | ||
3704 | // Return the number of entries in the .dynsym section. | |
3705 | unsigned int get_dt_mips_symtabno() const | |
3706 | { | |
3707 | return ((unsigned int)(this->layout_->dynsym_section()->data_size() | |
3708 | / elfcpp::Elf_sizes<size>::sym_size)); | |
3709 | // TODO(sasa): Entry size is MIPS_ELF_SYM_SIZE. | |
3710 | } | |
3711 | ||
3712 | // Information about this specific target which we pass to the | |
3713 | // general Target structure. | |
3714 | static Target::Target_info mips_info; | |
3715 | // The GOT section. | |
3716 | Mips_output_data_got<size, big_endian>* got_; | |
3717 | // gp symbol. It has the value of .got + 0x7FF0. | |
3718 | Sized_symbol<size>* gp_; | |
3719 | // The PLT section. | |
3720 | Mips_output_data_plt<size, big_endian>* plt_; | |
3721 | // The GOT PLT section. | |
3722 | Output_data_space* got_plt_; | |
3723 | // The dynamic reloc section. | |
3724 | Reloc_section* rel_dyn_; | |
3725 | // Relocs saved to avoid a COPY reloc. | |
3726 | Mips_copy_relocs<elfcpp::SHT_REL, size, big_endian> copy_relocs_; | |
3727 | ||
3728 | // A list of dyn relocs to be saved. | |
3729 | std::vector<Dyn_reloc> dyn_relocs_; | |
3730 | ||
3731 | // The LA25 stub section. | |
3732 | Mips_output_data_la25_stub<size, big_endian>* la25_stub_; | |
3733 | // Architecture extensions. | |
3734 | std::vector<std::pair<unsigned int, unsigned int> > mips_mach_extensions_; | |
3735 | // .MIPS.stubs | |
3736 | Mips_output_data_mips_stubs<size, big_endian>* mips_stubs_; | |
3737 | ||
3738 | unsigned char ei_class_; | |
3739 | unsigned int mach_; | |
3740 | Layout* layout_; | |
3741 | ||
3742 | typename std::list<got16_addend<size, big_endian> > got16_addends_; | |
3743 | ||
3744 | // Whether the entry symbol is mips16 or micromips. | |
3745 | bool entry_symbol_is_compressed_; | |
3746 | ||
3747 | // Whether we can use only 32-bit microMIPS instructions. | |
3748 | // TODO(sasa): This should be a linker option. | |
3749 | bool insn32_; | |
3750 | }; | |
3751 | ||
3752 | ||
3753 | // Helper structure for R_MIPS*_HI16/LO16 and R_MIPS*_GOT16/LO16 relocations. | |
3754 | // It records high part of the relocation pair. | |
3755 | ||
3756 | template<int size, bool big_endian> | |
3757 | struct reloc_high | |
3758 | { | |
3759 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
3760 | ||
3761 | reloc_high(unsigned char* _view, const Mips_relobj<size, big_endian>* _object, | |
3762 | const Symbol_value<size>* _psymval, Mips_address _addend, | |
3763 | unsigned int _r_type, bool _extract_addend, | |
3764 | Mips_address _address = 0, bool _gp_disp = false) | |
3765 | : view(_view), object(_object), psymval(_psymval), addend(_addend), | |
3766 | r_type(_r_type), extract_addend(_extract_addend), address(_address), | |
3767 | gp_disp(_gp_disp) | |
3768 | { } | |
3769 | ||
3770 | unsigned char* view; | |
3771 | const Mips_relobj<size, big_endian>* object; | |
3772 | const Symbol_value<size>* psymval; | |
3773 | Mips_address addend; | |
3774 | unsigned int r_type; | |
3775 | bool extract_addend; | |
3776 | Mips_address address; | |
3777 | bool gp_disp; | |
3778 | }; | |
3779 | ||
3780 | template<int size, bool big_endian> | |
3781 | class Mips_relocate_functions : public Relocate_functions<size, big_endian> | |
3782 | { | |
3783 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; | |
3784 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype16; | |
3785 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype32; | |
3786 | ||
3787 | public: | |
3788 | typedef enum | |
3789 | { | |
3790 | STATUS_OKAY, // No error during relocation. | |
3791 | STATUS_OVERFLOW, // Relocation overflow. | |
3792 | STATUS_BAD_RELOC // Relocation cannot be applied. | |
3793 | } Status; | |
3794 | ||
3795 | private: | |
3796 | typedef Relocate_functions<size, big_endian> Base; | |
3797 | typedef Mips_relocate_functions<size, big_endian> This; | |
3798 | ||
3799 | static typename std::list<reloc_high<size, big_endian> > hi16_relocs; | |
3800 | static typename std::list<reloc_high<size, big_endian> > got16_relocs; | |
3801 | ||
3802 | // R_MIPS16_26 is used for the mips16 jal and jalx instructions. | |
3803 | // Most mips16 instructions are 16 bits, but these instructions | |
3804 | // are 32 bits. | |
3805 | // | |
3806 | // The format of these instructions is: | |
3807 | // | |
3808 | // +--------------+--------------------------------+ | |
3809 | // | JALX | X| Imm 20:16 | Imm 25:21 | | |
3810 | // +--------------+--------------------------------+ | |
3811 | // | Immediate 15:0 | | |
3812 | // +-----------------------------------------------+ | |
3813 | // | |
3814 | // JALX is the 5-bit value 00011. X is 0 for jal, 1 for jalx. | |
3815 | // Note that the immediate value in the first word is swapped. | |
3816 | // | |
3817 | // When producing a relocatable object file, R_MIPS16_26 is | |
3818 | // handled mostly like R_MIPS_26. In particular, the addend is | |
3819 | // stored as a straight 26-bit value in a 32-bit instruction. | |
3820 | // (gas makes life simpler for itself by never adjusting a | |
3821 | // R_MIPS16_26 reloc to be against a section, so the addend is | |
3822 | // always zero). However, the 32 bit instruction is stored as 2 | |
3823 | // 16-bit values, rather than a single 32-bit value. In a | |
3824 | // big-endian file, the result is the same; in a little-endian | |
3825 | // file, the two 16-bit halves of the 32 bit value are swapped. | |
3826 | // This is so that a disassembler can recognize the jal | |
3827 | // instruction. | |
3828 | // | |
3829 | // When doing a final link, R_MIPS16_26 is treated as a 32 bit | |
3830 | // instruction stored as two 16-bit values. The addend A is the | |
3831 | // contents of the targ26 field. The calculation is the same as | |
3832 | // R_MIPS_26. When storing the calculated value, reorder the | |
3833 | // immediate value as shown above, and don't forget to store the | |
3834 | // value as two 16-bit values. | |
3835 | // | |
3836 | // To put it in MIPS ABI terms, the relocation field is T-targ26-16, | |
3837 | // defined as | |
3838 | // | |
3839 | // big-endian: | |
3840 | // +--------+----------------------+ | |
3841 | // | | | | |
3842 | // | | targ26-16 | | |
3843 | // |31 26|25 0| | |
3844 | // +--------+----------------------+ | |
3845 | // | |
3846 | // little-endian: | |
3847 | // +----------+------+-------------+ | |
3848 | // | | | | | |
3849 | // | sub1 | | sub2 | | |
3850 | // |0 9|10 15|16 31| | |
3851 | // +----------+--------------------+ | |
3852 | // where targ26-16 is sub1 followed by sub2 (i.e., the addend field A is | |
3853 | // ((sub1 << 16) | sub2)). | |
3854 | // | |
3855 | // When producing a relocatable object file, the calculation is | |
3856 | // (((A < 2) | ((P + 4) & 0xf0000000) + S) >> 2) | |
3857 | // When producing a fully linked file, the calculation is | |
3858 | // let R = (((A < 2) | ((P + 4) & 0xf0000000) + S) >> 2) | |
3859 | // ((R & 0x1f0000) << 5) | ((R & 0x3e00000) >> 5) | (R & 0xffff) | |
3860 | // | |
3861 | // The table below lists the other MIPS16 instruction relocations. | |
3862 | // Each one is calculated in the same way as the non-MIPS16 relocation | |
3863 | // given on the right, but using the extended MIPS16 layout of 16-bit | |
3864 | // immediate fields: | |
3865 | // | |
3866 | // R_MIPS16_GPREL R_MIPS_GPREL16 | |
3867 | // R_MIPS16_GOT16 R_MIPS_GOT16 | |
3868 | // R_MIPS16_CALL16 R_MIPS_CALL16 | |
3869 | // R_MIPS16_HI16 R_MIPS_HI16 | |
3870 | // R_MIPS16_LO16 R_MIPS_LO16 | |
3871 | // | |
3872 | // A typical instruction will have a format like this: | |
3873 | // | |
3874 | // +--------------+--------------------------------+ | |
3875 | // | EXTEND | Imm 10:5 | Imm 15:11 | | |
3876 | // +--------------+--------------------------------+ | |
3877 | // | Major | rx | ry | Imm 4:0 | | |
3878 | // +--------------+--------------------------------+ | |
3879 | // | |
3880 | // EXTEND is the five bit value 11110. Major is the instruction | |
3881 | // opcode. | |
3882 | // | |
3883 | // All we need to do here is shuffle the bits appropriately. | |
3884 | // As above, the two 16-bit halves must be swapped on a | |
3885 | // little-endian system. | |
3886 | ||
3887 | // Similar to MIPS16, the two 16-bit halves in microMIPS must be swapped | |
3888 | // on a little-endian system. This does not apply to R_MICROMIPS_PC7_S1 | |
3889 | // and R_MICROMIPS_PC10_S1 relocs that apply to 16-bit instructions. | |
3890 | ||
3891 | static inline bool | |
3892 | should_shuffle_micromips_reloc(unsigned int r_type) | |
3893 | { | |
3894 | return (micromips_reloc(r_type) | |
3895 | && r_type != elfcpp::R_MICROMIPS_PC7_S1 | |
3896 | && r_type != elfcpp::R_MICROMIPS_PC10_S1); | |
3897 | } | |
3898 | ||
3899 | static void | |
3900 | mips_reloc_unshuffle(unsigned char* view, unsigned int r_type, | |
3901 | bool jal_shuffle) | |
3902 | { | |
3903 | if (!mips16_reloc(r_type) | |
3904 | && !should_shuffle_micromips_reloc(r_type)) | |
3905 | return; | |
3906 | ||
3907 | // Pick up the first and second halfwords of the instruction. | |
3908 | Valtype16 first = elfcpp::Swap<16, big_endian>::readval(view); | |
3909 | Valtype16 second = elfcpp::Swap<16, big_endian>::readval(view + 2); | |
3910 | Valtype32 val; | |
3911 | ||
3912 | if (micromips_reloc(r_type) | |
3913 | || (r_type == elfcpp::R_MIPS16_26 && !jal_shuffle)) | |
3914 | val = first << 16 | second; | |
3915 | else if (r_type != elfcpp::R_MIPS16_26) | |
3916 | val = (((first & 0xf800) << 16) | ((second & 0xffe0) << 11) | |
3917 | | ((first & 0x1f) << 11) | (first & 0x7e0) | (second & 0x1f)); | |
3918 | else | |
3919 | val = (((first & 0xfc00) << 16) | ((first & 0x3e0) << 11) | |
3920 | | ((first & 0x1f) << 21) | second); | |
3921 | ||
3922 | elfcpp::Swap<32, big_endian>::writeval(view, val); | |
3923 | } | |
3924 | ||
3925 | static void | |
3926 | mips_reloc_shuffle(unsigned char* view, unsigned int r_type, bool jal_shuffle) | |
3927 | { | |
3928 | if (!mips16_reloc(r_type) | |
3929 | && !should_shuffle_micromips_reloc(r_type)) | |
3930 | return; | |
3931 | ||
3932 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); | |
3933 | Valtype16 first, second; | |
3934 | ||
3935 | if (micromips_reloc(r_type) | |
3936 | || (r_type == elfcpp::R_MIPS16_26 && !jal_shuffle)) | |
3937 | { | |
3938 | second = val & 0xffff; | |
3939 | first = val >> 16; | |
3940 | } | |
3941 | else if (r_type != elfcpp::R_MIPS16_26) | |
3942 | { | |
3943 | second = ((val >> 11) & 0xffe0) | (val & 0x1f); | |
3944 | first = ((val >> 16) & 0xf800) | ((val >> 11) & 0x1f) | (val & 0x7e0); | |
3945 | } | |
3946 | else | |
3947 | { | |
3948 | second = val & 0xffff; | |
3949 | first = ((val >> 16) & 0xfc00) | ((val >> 11) & 0x3e0) | |
3950 | | ((val >> 21) & 0x1f); | |
3951 | } | |
3952 | ||
3953 | elfcpp::Swap<16, big_endian>::writeval(view + 2, second); | |
3954 | elfcpp::Swap<16, big_endian>::writeval(view, first); | |
3955 | } | |
3956 | ||
3957 | public: | |
3958 | // R_MIPS_16: S + sign-extend(A) | |
3959 | static inline typename This::Status | |
3960 | rel16(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
3961 | const Symbol_value<size>* psymval, Mips_address addend_a, | |
3962 | bool extract_addend, unsigned int r_type) | |
3963 | { | |
3964 | mips_reloc_unshuffle(view, r_type, false); | |
3965 | Valtype16* wv = reinterpret_cast<Valtype16*>(view); | |
3966 | Valtype16 val = elfcpp::Swap<16, big_endian>::readval(wv); | |
3967 | ||
3968 | Valtype32 addend = (extract_addend ? Bits<16>::sign_extend32(val) | |
3969 | : Bits<16>::sign_extend32(addend_a)); | |
3970 | ||
3971 | Valtype32 x = psymval->value(object, addend); | |
3972 | val = Bits<16>::bit_select32(val, x, 0xffffU); | |
3973 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
3974 | mips_reloc_shuffle(view, r_type, false); | |
3975 | return (Bits<16>::has_overflow32(x) | |
3976 | ? This::STATUS_OVERFLOW | |
3977 | : This::STATUS_OKAY); | |
3978 | } | |
3979 | ||
3980 | // R_MIPS_32: S + A | |
3981 | static inline typename This::Status | |
3982 | rel32(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
3983 | const Symbol_value<size>* psymval, Mips_address addend_a, | |
3984 | bool extract_addend, unsigned int r_type) | |
3985 | { | |
3986 | mips_reloc_unshuffle(view, r_type, false); | |
3987 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
3988 | Valtype32 addend = (extract_addend | |
3989 | ? elfcpp::Swap<32, big_endian>::readval(wv) | |
3990 | : Bits<32>::sign_extend32(addend_a)); | |
3991 | Valtype32 x = psymval->value(object, addend); | |
3992 | elfcpp::Swap<32, big_endian>::writeval(wv, x); | |
3993 | mips_reloc_shuffle(view, r_type, false); | |
3994 | return This::STATUS_OKAY; | |
3995 | } | |
3996 | ||
3997 | // R_MIPS_JALR, R_MICROMIPS_JALR | |
3998 | static inline typename This::Status | |
3999 | reljalr(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4000 | const Symbol_value<size>* psymval, Mips_address address, | |
4001 | Mips_address addend_a, bool extract_addend, bool cross_mode_jump, | |
4002 | unsigned int r_type, bool jalr_to_bal, bool jr_to_b) | |
4003 | { | |
4004 | mips_reloc_unshuffle(view, r_type, false); | |
4005 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4006 | Valtype32 addend = extract_addend ? 0 : addend_a; | |
4007 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4008 | ||
4009 | // Try converting J(AL)R to B(AL), if the target is in range. | |
4010 | if (!parameters->options().relocatable() | |
4011 | && r_type == elfcpp::R_MIPS_JALR | |
4012 | && !cross_mode_jump | |
4013 | && ((jalr_to_bal && val == 0x0320f809) // jalr t9 | |
4014 | || (jr_to_b && val == 0x03200008))) // jr t9 | |
4015 | { | |
4016 | int offset = psymval->value(object, addend) - (address + 4); | |
4017 | if (!Bits<18>::has_overflow32(offset)) | |
4018 | { | |
4019 | if (val == 0x03200008) // jr t9 | |
4020 | val = 0x10000000 | (((Valtype32)offset >> 2) & 0xffff); // b addr | |
4021 | else | |
4022 | val = 0x04110000 | (((Valtype32)offset >> 2) & 0xffff); //bal addr | |
4023 | } | |
4024 | } | |
4025 | ||
4026 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4027 | mips_reloc_shuffle(view, r_type, false); | |
4028 | return This::STATUS_OKAY; | |
4029 | } | |
4030 | ||
4031 | // R_MIPS_PC32: S + A - P | |
4032 | static inline typename This::Status | |
4033 | relpc32(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4034 | const Symbol_value<size>* psymval, Mips_address address, | |
4035 | Mips_address addend_a, bool extract_addend, unsigned int r_type) | |
4036 | { | |
4037 | mips_reloc_unshuffle(view, r_type, false); | |
4038 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4039 | Valtype32 addend = (extract_addend | |
4040 | ? elfcpp::Swap<32, big_endian>::readval(wv) | |
4041 | : Bits<32>::sign_extend32(addend_a)); | |
4042 | Valtype32 x = psymval->value(object, addend) - address; | |
4043 | elfcpp::Swap<32, big_endian>::writeval(wv, x); | |
4044 | mips_reloc_shuffle(view, r_type, false); | |
4045 | return This::STATUS_OKAY; | |
4046 | } | |
4047 | ||
4048 | // R_MIPS_26, R_MIPS16_26, R_MICROMIPS_26_S1 | |
4049 | static inline typename This::Status | |
4050 | rel26(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4051 | const Symbol_value<size>* psymval, Mips_address address, | |
4052 | bool local, Mips_address addend_a, bool extract_addend, | |
4053 | const Symbol* gsym, bool cross_mode_jump, unsigned int r_type, | |
4054 | bool jal_to_bal) | |
4055 | { | |
4056 | mips_reloc_unshuffle(view, r_type, false); | |
4057 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4058 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4059 | ||
4060 | Valtype32 addend; | |
4061 | if (extract_addend) | |
4062 | { | |
4063 | if (r_type == elfcpp::R_MICROMIPS_26_S1) | |
4064 | addend = (val & 0x03ffffff) << 1; | |
4065 | else | |
4066 | addend = (val & 0x03ffffff) << 2; | |
4067 | } | |
4068 | else | |
4069 | addend = addend_a; | |
4070 | ||
4071 | // Make sure the target of JALX is word-aligned. Bit 0 must be | |
4072 | // the correct ISA mode selector and bit 1 must be 0. | |
4073 | if (cross_mode_jump | |
4074 | && (psymval->value(object, 0) & 3) != (r_type == elfcpp::R_MIPS_26)) | |
4075 | { | |
4076 | gold_warning(_("JALX to a non-word-aligned address")); | |
4077 | mips_reloc_shuffle(view, r_type, !parameters->options().relocatable()); | |
4078 | return This::STATUS_BAD_RELOC; | |
4079 | } | |
4080 | ||
4081 | // Shift is 2, unusually, for microMIPS JALX. | |
4082 | unsigned int shift = | |
4083 | (!cross_mode_jump && r_type == elfcpp::R_MICROMIPS_26_S1) ? 1 : 2; | |
4084 | ||
4085 | Valtype32 x; | |
4086 | if (local) | |
4087 | x = addend | ((address + 4) & (0xfc000000 << shift)); | |
4088 | else | |
4089 | { | |
4090 | if (shift == 1) | |
4091 | x = Bits<27>::sign_extend32(addend); | |
4092 | else | |
4093 | x = Bits<28>::sign_extend32(addend); | |
4094 | } | |
4095 | x = psymval->value(object, x) >> shift; | |
4096 | ||
4097 | if (!local && !gsym->is_weak_undefined()) | |
4098 | { | |
4099 | if ((x >> 26) != ((address + 4) >> (26 + shift))) | |
4100 | { | |
4101 | gold_error(_("relocation truncated to fit: %u against '%s'"), | |
4102 | r_type, gsym->name()); | |
4103 | return This::STATUS_OVERFLOW; | |
4104 | } | |
4105 | } | |
4106 | ||
4107 | val = Bits<32>::bit_select32(val, x, 0x03ffffff); | |
4108 | ||
4109 | // If required, turn JAL into JALX. | |
4110 | if (cross_mode_jump) | |
4111 | { | |
4112 | bool ok; | |
4113 | Valtype32 opcode = val >> 26; | |
4114 | Valtype32 jalx_opcode; | |
4115 | ||
4116 | // Check to see if the opcode is already JAL or JALX. | |
4117 | if (r_type == elfcpp::R_MIPS16_26) | |
4118 | { | |
4119 | ok = (opcode == 0x6) || (opcode == 0x7); | |
4120 | jalx_opcode = 0x7; | |
4121 | } | |
4122 | else if (r_type == elfcpp::R_MICROMIPS_26_S1) | |
4123 | { | |
4124 | ok = (opcode == 0x3d) || (opcode == 0x3c); | |
4125 | jalx_opcode = 0x3c; | |
4126 | } | |
4127 | else | |
4128 | { | |
4129 | ok = (opcode == 0x3) || (opcode == 0x1d); | |
4130 | jalx_opcode = 0x1d; | |
4131 | } | |
4132 | ||
4133 | // If the opcode is not JAL or JALX, there's a problem. We cannot | |
4134 | // convert J or JALS to JALX. | |
4135 | if (!ok) | |
4136 | { | |
4137 | gold_error(_("Unsupported jump between ISA modes; consider " | |
4138 | "recompiling with interlinking enabled.")); | |
4139 | return This::STATUS_BAD_RELOC; | |
4140 | } | |
4141 | ||
4142 | // Make this the JALX opcode. | |
4143 | val = (val & ~(0x3f << 26)) | (jalx_opcode << 26); | |
4144 | } | |
4145 | ||
4146 | // Try converting JAL to BAL, if the target is in range. | |
4147 | if (!parameters->options().relocatable() | |
4148 | && !cross_mode_jump | |
4149 | && ((jal_to_bal | |
4150 | && r_type == elfcpp::R_MIPS_26 | |
4151 | && (val >> 26) == 0x3))) // jal addr | |
4152 | { | |
4153 | Valtype32 dest = (x << 2) | (((address + 4) >> 28) << 28); | |
4154 | int offset = dest - (address + 4); | |
4155 | if (!Bits<18>::has_overflow32(offset)) | |
4156 | { | |
4157 | if (val == 0x03200008) // jr t9 | |
4158 | val = 0x10000000 | (((Valtype32)offset >> 2) & 0xffff); // b addr | |
4159 | else | |
4160 | val = 0x04110000 | (((Valtype32)offset >> 2) & 0xffff); //bal addr | |
4161 | } | |
4162 | } | |
4163 | ||
4164 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4165 | mips_reloc_shuffle(view, r_type, !parameters->options().relocatable()); | |
4166 | return This::STATUS_OKAY; | |
4167 | } | |
4168 | ||
4169 | // R_MIPS_PC16 | |
4170 | static inline typename This::Status | |
4171 | relpc16(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4172 | const Symbol_value<size>* psymval, Mips_address address, | |
4173 | Mips_address addend_a, bool extract_addend, unsigned int r_type) | |
4174 | { | |
4175 | mips_reloc_unshuffle(view, r_type, false); | |
4176 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4177 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4178 | ||
4179 | Valtype32 addend = extract_addend ? (val & 0xffff) << 2 : addend_a; | |
4180 | addend = Bits<18>::sign_extend32(addend); | |
4181 | ||
4182 | Valtype32 x = psymval->value(object, addend) - address; | |
4183 | val = Bits<16>::bit_select32(val, x >> 2, 0xffff); | |
4184 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4185 | mips_reloc_shuffle(view, r_type, false); | |
4186 | return (Bits<18>::has_overflow32(x) | |
4187 | ? This::STATUS_OVERFLOW | |
4188 | : This::STATUS_OKAY); | |
4189 | } | |
4190 | ||
4191 | // R_MICROMIPS_PC7_S1 | |
4192 | static inline typename This::Status | |
4193 | relmicromips_pc7_s1(unsigned char* view, | |
4194 | const Mips_relobj<size, big_endian>* object, | |
4195 | const Symbol_value<size>* psymval, Mips_address address, | |
4196 | Mips_address addend_a, bool extract_addend, | |
4197 | unsigned int r_type) | |
4198 | { | |
4199 | mips_reloc_unshuffle(view, r_type, false); | |
4200 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4201 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4202 | ||
4203 | Valtype32 addend = extract_addend ? (val & 0x7f) << 1 : addend_a; | |
4204 | addend = Bits<8>::sign_extend32(addend); | |
4205 | ||
4206 | Valtype32 x = psymval->value(object, addend) - address; | |
4207 | val = Bits<16>::bit_select32(val, x >> 1, 0x7f); | |
4208 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4209 | mips_reloc_shuffle(view, r_type, false); | |
4210 | return (Bits<8>::has_overflow32(x) | |
4211 | ? This::STATUS_OVERFLOW | |
4212 | : This::STATUS_OKAY); | |
4213 | } | |
4214 | ||
4215 | // R_MICROMIPS_PC10_S1 | |
4216 | static inline typename This::Status | |
4217 | relmicromips_pc10_s1(unsigned char* view, | |
4218 | const Mips_relobj<size, big_endian>* object, | |
4219 | const Symbol_value<size>* psymval, Mips_address address, | |
4220 | Mips_address addend_a, bool extract_addend, | |
4221 | unsigned int r_type) | |
4222 | { | |
4223 | mips_reloc_unshuffle(view, r_type, false); | |
4224 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4225 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4226 | ||
4227 | Valtype32 addend = extract_addend ? (val & 0x3ff) << 1 : addend_a; | |
4228 | addend = Bits<11>::sign_extend32(addend); | |
4229 | ||
4230 | Valtype32 x = psymval->value(object, addend) - address; | |
4231 | val = Bits<16>::bit_select32(val, x >> 1, 0x3ff); | |
4232 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4233 | mips_reloc_shuffle(view, r_type, false); | |
4234 | return (Bits<11>::has_overflow32(x) | |
4235 | ? This::STATUS_OVERFLOW | |
4236 | : This::STATUS_OKAY); | |
4237 | } | |
4238 | ||
4239 | // R_MICROMIPS_PC16_S1 | |
4240 | static inline typename This::Status | |
4241 | relmicromips_pc16_s1(unsigned char* view, | |
4242 | const Mips_relobj<size, big_endian>* object, | |
4243 | const Symbol_value<size>* psymval, Mips_address address, | |
4244 | Mips_address addend_a, bool extract_addend, | |
4245 | unsigned int r_type) | |
4246 | { | |
4247 | mips_reloc_unshuffle(view, r_type, false); | |
4248 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4249 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4250 | ||
4251 | Valtype32 addend = extract_addend ? (val & 0xffff) << 1 : addend_a; | |
4252 | addend = Bits<17>::sign_extend32(addend); | |
4253 | ||
4254 | Valtype32 x = psymval->value(object, addend) - address; | |
4255 | val = Bits<16>::bit_select32(val, x >> 1, 0xffff); | |
4256 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4257 | mips_reloc_shuffle(view, r_type, false); | |
4258 | return (Bits<17>::has_overflow32(x) | |
4259 | ? This::STATUS_OVERFLOW | |
4260 | : This::STATUS_OKAY); | |
4261 | } | |
4262 | ||
4263 | // R_MIPS_HI16, R_MIPS16_HI16, R_MICROMIPS_HI16, | |
4264 | static inline typename This::Status | |
4265 | relhi16(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4266 | const Symbol_value<size>* psymval, Mips_address addend, | |
4267 | Mips_address address, bool gp_disp, unsigned int r_type, | |
4268 | bool extract_addend) | |
4269 | { | |
4270 | // Record the relocation. It will be resolved when we find lo16 part. | |
4271 | hi16_relocs.push_back(reloc_high<size, big_endian>(view, object, psymval, | |
4272 | addend, r_type, extract_addend, address, gp_disp)); | |
4273 | return This::STATUS_OKAY; | |
4274 | } | |
4275 | ||
4276 | // R_MIPS_HI16, R_MIPS16_HI16, R_MICROMIPS_HI16, | |
4277 | static inline typename This::Status | |
4278 | do_relhi16(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4279 | const Symbol_value<size>* psymval, Mips_address addend_hi, | |
4280 | Mips_address address, bool is_gp_disp, unsigned int r_type, | |
4281 | bool extract_addend, Valtype32 addend_lo, | |
4282 | Target_mips<size, big_endian>* target) | |
4283 | { | |
4284 | mips_reloc_unshuffle(view, r_type, false); | |
4285 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4286 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4287 | ||
4288 | Valtype32 addend = (extract_addend ? ((val & 0xffff) << 16) + addend_lo | |
4289 | : addend_hi); | |
4290 | ||
4291 | Valtype32 value; | |
4292 | if (!is_gp_disp) | |
4293 | value = psymval->value(object, addend); | |
4294 | else | |
4295 | { | |
4296 | // For MIPS16 ABI code we generate this sequence | |
4297 | // 0: li $v0,%hi(_gp_disp) | |
4298 | // 4: addiupc $v1,%lo(_gp_disp) | |
4299 | // 8: sll $v0,16 | |
4300 | // 12: addu $v0,$v1 | |
4301 | // 14: move $gp,$v0 | |
4302 | // So the offsets of hi and lo relocs are the same, but the | |
4303 | // base $pc is that used by the ADDIUPC instruction at $t9 + 4. | |
4304 | // ADDIUPC clears the low two bits of the instruction address, | |
4305 | // so the base is ($t9 + 4) & ~3. | |
4306 | Valtype32 gp_disp; | |
4307 | if (r_type == elfcpp::R_MIPS16_HI16) | |
4308 | gp_disp = (target->adjusted_gp_value(object) | |
4309 | - ((address + 4) & ~0x3)); | |
4310 | // The microMIPS .cpload sequence uses the same assembly | |
4311 | // instructions as the traditional psABI version, but the | |
4312 | // incoming $t9 has the low bit set. | |
4313 | else if (r_type == elfcpp::R_MICROMIPS_HI16) | |
4314 | gp_disp = target->adjusted_gp_value(object) - address - 1; | |
4315 | else | |
4316 | gp_disp = target->adjusted_gp_value(object) - address; | |
4317 | value = gp_disp + addend; | |
4318 | } | |
4319 | Valtype32 x = ((value + 0x8000) >> 16) & 0xffff; | |
4320 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4321 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4322 | mips_reloc_shuffle(view, r_type, false); | |
4323 | return (is_gp_disp && Bits<16>::has_overflow32(x) | |
4324 | ? This::STATUS_OVERFLOW | |
4325 | : This::STATUS_OKAY); | |
4326 | } | |
4327 | ||
4328 | // R_MIPS_GOT16, R_MIPS16_GOT16, R_MICROMIPS_GOT16 | |
4329 | static inline typename This::Status | |
4330 | relgot16_local(unsigned char* view, | |
4331 | const Mips_relobj<size, big_endian>* object, | |
4332 | const Symbol_value<size>* psymval, Mips_address addend_a, | |
4333 | bool extract_addend, unsigned int r_type) | |
4334 | { | |
4335 | // Record the relocation. It will be resolved when we find lo16 part. | |
4336 | got16_relocs.push_back(reloc_high<size, big_endian>(view, object, psymval, | |
4337 | addend_a, r_type, extract_addend)); | |
4338 | return This::STATUS_OKAY; | |
4339 | } | |
4340 | ||
4341 | // R_MIPS_GOT16, R_MIPS16_GOT16, R_MICROMIPS_GOT16 | |
4342 | static inline typename This::Status | |
4343 | do_relgot16_local(unsigned char* view, | |
4344 | const Mips_relobj<size, big_endian>* object, | |
4345 | const Symbol_value<size>* psymval, Mips_address addend_hi, | |
4346 | unsigned int r_type, bool extract_addend, | |
4347 | Valtype32 addend_lo, Target_mips<size, big_endian>* target) | |
4348 | { | |
4349 | mips_reloc_unshuffle(view, r_type, false); | |
4350 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4351 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4352 | ||
4353 | Valtype32 addend = (extract_addend ? ((val & 0xffff) << 16) + addend_lo | |
4354 | : addend_hi); | |
4355 | ||
4356 | // Find GOT page entry. | |
4357 | Mips_address value = ((psymval->value(object, addend) + 0x8000) >> 16) | |
4358 | & 0xffff; | |
4359 | value <<= 16; | |
4360 | unsigned int got_offset = | |
4361 | target->got_section()->get_got_page_offset(value, object); | |
4362 | ||
4363 | // Resolve the relocation. | |
4364 | Valtype32 x = target->got_section()->gp_offset(got_offset, object); | |
4365 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4366 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4367 | mips_reloc_shuffle(view, r_type, false); | |
4368 | return (Bits<16>::has_overflow32(x) | |
4369 | ? This::STATUS_OVERFLOW | |
4370 | : This::STATUS_OKAY); | |
4371 | } | |
4372 | ||
4373 | // R_MIPS_LO16, R_MIPS16_LO16, R_MICROMIPS_LO16, R_MICROMIPS_HI0_LO16 | |
4374 | static inline typename This::Status | |
4375 | rello16(Target_mips<size, big_endian>* target, unsigned char* view, | |
4376 | const Mips_relobj<size, big_endian>* object, | |
4377 | const Symbol_value<size>* psymval, Mips_address addend_a, | |
4378 | bool extract_addend, Mips_address address, bool is_gp_disp, | |
4379 | unsigned int r_type) | |
4380 | { | |
4381 | mips_reloc_unshuffle(view, r_type, false); | |
4382 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4383 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4384 | ||
4385 | Valtype32 addend = (extract_addend ? Bits<16>::sign_extend32(val & 0xffff) | |
4386 | : addend_a); | |
4387 | ||
4388 | // Resolve pending R_MIPS_HI16 relocations. | |
4389 | typename std::list<reloc_high<size, big_endian> >::iterator it = | |
4390 | hi16_relocs.begin(); | |
4391 | while (it != hi16_relocs.end()) | |
4392 | { | |
4393 | reloc_high<size, big_endian> hi16 = *it; | |
4394 | if (hi16.psymval->value(hi16.object, 0) == psymval->value(object, 0)) | |
4395 | { | |
4396 | if (do_relhi16(hi16.view, hi16.object, hi16.psymval, hi16.addend, | |
4397 | hi16.address, hi16.gp_disp, hi16.r_type, | |
4398 | hi16.extract_addend, addend, target) | |
4399 | == This::STATUS_OVERFLOW) | |
4400 | return This::STATUS_OVERFLOW; | |
4401 | it = hi16_relocs.erase(it); | |
4402 | } | |
4403 | else | |
4404 | ++it; | |
4405 | } | |
4406 | ||
4407 | // Resolve pending local R_MIPS_GOT16 relocations. | |
4408 | typename std::list<reloc_high<size, big_endian> >::iterator it2 = | |
4409 | got16_relocs.begin(); | |
4410 | while (it2 != got16_relocs.end()) | |
4411 | { | |
4412 | reloc_high<size, big_endian> got16 = *it2; | |
4413 | if (got16.psymval->value(got16.object, 0) == psymval->value(object, 0)) | |
4414 | { | |
4415 | if (do_relgot16_local(got16.view, got16.object, got16.psymval, | |
4416 | got16.addend, got16.r_type, | |
4417 | got16.extract_addend, addend, | |
4418 | target) == This::STATUS_OVERFLOW) | |
4419 | return This::STATUS_OVERFLOW; | |
4420 | it2 = got16_relocs.erase(it2); | |
4421 | } | |
4422 | else | |
4423 | ++it2; | |
4424 | } | |
4425 | ||
4426 | // Resolve R_MIPS_LO16 relocation. | |
4427 | Valtype32 x; | |
4428 | if (!is_gp_disp) | |
4429 | x = psymval->value(object, addend); | |
4430 | else | |
4431 | { | |
4432 | // See the comment for R_MIPS16_HI16 above for the reason | |
4433 | // for this conditional. | |
4434 | Valtype32 gp_disp; | |
4435 | if (r_type == elfcpp::R_MIPS16_LO16) | |
4436 | gp_disp = target->adjusted_gp_value(object) - (address & ~0x3); | |
4437 | else if (r_type == elfcpp::R_MICROMIPS_LO16 | |
4438 | || r_type == elfcpp::R_MICROMIPS_HI0_LO16) | |
4439 | gp_disp = target->adjusted_gp_value(object) - address + 3; | |
4440 | else | |
4441 | gp_disp = target->adjusted_gp_value(object) - address + 4; | |
4442 | // The MIPS ABI requires checking the R_MIPS_LO16 relocation | |
4443 | // for overflow. Relocations against _gp_disp are normally | |
4444 | // generated from the .cpload pseudo-op. It generates code | |
4445 | // that normally looks like this: | |
4446 | ||
4447 | // lui $gp,%hi(_gp_disp) | |
4448 | // addiu $gp,$gp,%lo(_gp_disp) | |
4449 | // addu $gp,$gp,$t9 | |
4450 | ||
4451 | // Here $t9 holds the address of the function being called, | |
4452 | // as required by the MIPS ELF ABI. The R_MIPS_LO16 | |
4453 | // relocation can easily overflow in this situation, but the | |
4454 | // R_MIPS_HI16 relocation will handle the overflow. | |
4455 | // Therefore, we consider this a bug in the MIPS ABI, and do | |
4456 | // not check for overflow here. | |
4457 | x = gp_disp + addend; | |
4458 | } | |
4459 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4460 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4461 | mips_reloc_shuffle(view, r_type, false); | |
4462 | return This::STATUS_OKAY; | |
4463 | } | |
4464 | ||
4465 | // R_MIPS_CALL16, R_MIPS16_CALL16, R_MICROMIPS_CALL16 | |
4466 | // R_MIPS_GOT16, R_MIPS16_GOT16, R_MICROMIPS_GOT16 | |
4467 | // R_MIPS_TLS_GD, R_MIPS16_TLS_GD, R_MICROMIPS_TLS_GD | |
4468 | // R_MIPS_TLS_GOTTPREL, R_MIPS16_TLS_GOTTPREL, R_MICROMIPS_TLS_GOTTPREL | |
4469 | // R_MIPS_TLS_LDM, R_MIPS16_TLS_LDM, R_MICROMIPS_TLS_LDM | |
4470 | // R_MIPS_GOT_DISP, R_MICROMIPS_GOT_DISP | |
4471 | static inline typename This::Status | |
4472 | relgot(unsigned char* view, int gp_offset, unsigned int r_type) | |
4473 | { | |
4474 | mips_reloc_unshuffle(view, r_type, false); | |
4475 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4476 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4477 | Valtype32 x = gp_offset; | |
4478 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4479 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4480 | mips_reloc_shuffle(view, r_type, false); | |
4481 | return (Bits<16>::has_overflow32(x) | |
4482 | ? This::STATUS_OVERFLOW | |
4483 | : This::STATUS_OKAY); | |
4484 | } | |
4485 | ||
4486 | // R_MIPS_GOT_PAGE, R_MICROMIPS_GOT_PAGE | |
4487 | static inline typename This::Status | |
4488 | relgotpage(Target_mips<size, big_endian>* target, unsigned char* view, | |
4489 | const Mips_relobj<size, big_endian>* object, | |
4490 | const Symbol_value<size>* psymval, Mips_address addend_a, | |
4491 | bool extract_addend, unsigned int r_type) | |
4492 | { | |
4493 | mips_reloc_unshuffle(view, r_type, false); | |
4494 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4495 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); | |
4496 | Valtype32 addend = extract_addend ? val & 0xffff : addend_a; | |
4497 | ||
4498 | // Find a GOT page entry that points to within 32KB of symbol + addend. | |
4499 | Mips_address value = (psymval->value(object, addend) + 0x8000) & ~0xffff; | |
4500 | unsigned int got_offset = | |
4501 | target->got_section()->get_got_page_offset(value, object); | |
4502 | ||
4503 | Valtype32 x = target->got_section()->gp_offset(got_offset, object); | |
4504 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4505 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4506 | mips_reloc_shuffle(view, r_type, false); | |
4507 | return (Bits<16>::has_overflow32(x) | |
4508 | ? This::STATUS_OVERFLOW | |
4509 | : This::STATUS_OKAY); | |
4510 | } | |
4511 | ||
4512 | // R_MIPS_GOT_OFST, R_MICROMIPS_GOT_OFST | |
4513 | static inline typename This::Status | |
4514 | relgotofst(Target_mips<size, big_endian>* target, unsigned char* view, | |
4515 | const Mips_relobj<size, big_endian>* object, | |
4516 | const Symbol_value<size>* psymval, Mips_address addend_a, | |
4517 | bool extract_addend, bool local, unsigned int r_type) | |
4518 | { | |
4519 | mips_reloc_unshuffle(view, r_type, false); | |
4520 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4521 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); | |
4522 | Valtype32 addend = extract_addend ? val & 0xffff : addend_a; | |
4523 | ||
4524 | // For a local symbol, find a GOT page entry that points to within 32KB of | |
4525 | // symbol + addend. Relocation value is the offset of the GOT page entry's | |
4526 | // value from symbol + addend. | |
4527 | // For a global symbol, relocation value is addend. | |
4528 | Valtype32 x; | |
4529 | if (local) | |
4530 | { | |
4531 | // Find GOT page entry. | |
4532 | Mips_address value = ((psymval->value(object, addend) + 0x8000) | |
4533 | & ~0xffff); | |
4534 | target->got_section()->get_got_page_offset(value, object); | |
4535 | ||
4536 | x = psymval->value(object, addend) - value; | |
4537 | } | |
4538 | else | |
4539 | x = addend; | |
4540 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4541 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4542 | mips_reloc_shuffle(view, r_type, false); | |
4543 | return (Bits<16>::has_overflow32(x) | |
4544 | ? This::STATUS_OVERFLOW | |
4545 | : This::STATUS_OKAY); | |
4546 | } | |
4547 | ||
4548 | // R_MIPS_GOT_HI16, R_MIPS_CALL_HI16, | |
4549 | // R_MICROMIPS_GOT_HI16, R_MICROMIPS_CALL_HI16 | |
4550 | static inline typename This::Status | |
4551 | relgot_hi16(unsigned char* view, int gp_offset, unsigned int r_type) | |
4552 | { | |
4553 | mips_reloc_unshuffle(view, r_type, false); | |
4554 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4555 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4556 | Valtype32 x = gp_offset; | |
4557 | x = ((x + 0x8000) >> 16) & 0xffff; | |
4558 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4559 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4560 | mips_reloc_shuffle(view, r_type, false); | |
4561 | return This::STATUS_OKAY; | |
4562 | } | |
4563 | ||
4564 | // R_MIPS_GOT_LO16, R_MIPS_CALL_LO16, | |
4565 | // R_MICROMIPS_GOT_LO16, R_MICROMIPS_CALL_LO16 | |
4566 | static inline typename This::Status | |
4567 | relgot_lo16(unsigned char* view, int gp_offset, unsigned int r_type) | |
4568 | { | |
4569 | mips_reloc_unshuffle(view, r_type, false); | |
4570 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4571 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4572 | Valtype32 x = gp_offset; | |
4573 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4574 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4575 | mips_reloc_shuffle(view, r_type, false); | |
4576 | return This::STATUS_OKAY; | |
4577 | } | |
4578 | ||
4579 | // R_MIPS_GPREL16, R_MIPS16_GPREL, R_MIPS_LITERAL, R_MICROMIPS_LITERAL | |
4580 | // R_MICROMIPS_GPREL7_S2, R_MICROMIPS_GPREL16 | |
4581 | static inline typename This::Status | |
4582 | relgprel(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4583 | const Symbol_value<size>* psymval, Mips_address gp, | |
4584 | Mips_address addend_a, bool extract_addend, bool local, | |
4585 | unsigned int r_type) | |
4586 | { | |
4587 | mips_reloc_unshuffle(view, r_type, false); | |
4588 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4589 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4590 | ||
4591 | Valtype32 addend; | |
4592 | if (extract_addend) | |
4593 | { | |
4594 | if (r_type == elfcpp::R_MICROMIPS_GPREL7_S2) | |
4595 | addend = (val & 0x7f) << 2; | |
4596 | else | |
4597 | addend = val & 0xffff; | |
4598 | // Only sign-extend the addend if it was extracted from the | |
4599 | // instruction. If the addend was separate, leave it alone, | |
4600 | // otherwise we may lose significant bits. | |
4601 | addend = Bits<16>::sign_extend32(addend); | |
4602 | } | |
4603 | else | |
4604 | addend = addend_a; | |
4605 | ||
4606 | Valtype32 x = psymval->value(object, addend) - gp; | |
4607 | ||
4608 | // If the symbol was local, any earlier relocatable links will | |
4609 | // have adjusted its addend with the gp offset, so compensate | |
4610 | // for that now. Don't do it for symbols forced local in this | |
4611 | // link, though, since they won't have had the gp offset applied | |
4612 | // to them before. | |
4613 | if (local) | |
4614 | x += object->gp_value(); | |
4615 | ||
4616 | if (r_type == elfcpp::R_MICROMIPS_GPREL7_S2) | |
4617 | val = Bits<32>::bit_select32(val, x, 0x7f); | |
4618 | else | |
4619 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4620 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4621 | mips_reloc_shuffle(view, r_type, false); | |
4622 | if (Bits<16>::has_overflow32(x)) | |
4623 | { | |
4624 | gold_error(_("small-data section exceeds 64KB; lower small-data size " | |
4625 | "limit (see option -G)")); | |
4626 | return This::STATUS_OVERFLOW; | |
4627 | } | |
4628 | return This::STATUS_OKAY; | |
4629 | } | |
4630 | ||
4631 | // R_MIPS_GPREL32 | |
4632 | static inline typename This::Status | |
4633 | relgprel32(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4634 | const Symbol_value<size>* psymval, Mips_address gp, | |
4635 | Mips_address addend_a, bool extract_addend, unsigned int r_type) | |
4636 | { | |
4637 | mips_reloc_unshuffle(view, r_type, false); | |
4638 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4639 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4640 | Valtype32 addend = extract_addend ? val : addend_a; | |
4641 | ||
4642 | // R_MIPS_GPREL32 relocations are defined for local symbols only. | |
4643 | Valtype32 x = psymval->value(object, addend) + object->gp_value() - gp; | |
4644 | elfcpp::Swap<32, big_endian>::writeval(wv, x); | |
4645 | mips_reloc_shuffle(view, r_type, false); | |
4646 | return This::STATUS_OKAY; | |
4647 | } | |
4648 | ||
4649 | // R_MIPS_TLS_TPREL_HI16, R_MIPS16_TLS_TPREL_HI16, R_MICROMIPS_TLS_TPREL_HI16 | |
4650 | // R_MIPS_TLS_DTPREL_HI16, R_MIPS16_TLS_DTPREL_HI16, | |
4651 | // R_MICROMIPS_TLS_DTPREL_HI16 | |
4652 | static inline typename This::Status | |
4653 | tlsrelhi16(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4654 | const Symbol_value<size>* psymval, Valtype32 tp_offset, | |
4655 | Mips_address addend_a, bool extract_addend, unsigned int r_type) | |
4656 | { | |
4657 | mips_reloc_unshuffle(view, r_type, false); | |
4658 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4659 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4660 | Valtype32 addend = extract_addend ? val & 0xffff : addend_a; | |
4661 | ||
4662 | // tls symbol values are relative to tls_segment()->vaddr() | |
4663 | Valtype32 x = ((psymval->value(object, addend) - tp_offset) + 0x8000) >> 16; | |
4664 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4665 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4666 | mips_reloc_shuffle(view, r_type, false); | |
4667 | return This::STATUS_OKAY; | |
4668 | } | |
4669 | ||
4670 | // R_MIPS_TLS_TPREL_LO16, R_MIPS16_TLS_TPREL_LO16, R_MICROMIPS_TLS_TPREL_LO16, | |
4671 | // R_MIPS_TLS_DTPREL_LO16, R_MIPS16_TLS_DTPREL_LO16, | |
4672 | // R_MICROMIPS_TLS_DTPREL_LO16, | |
4673 | static inline typename This::Status | |
4674 | tlsrello16(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4675 | const Symbol_value<size>* psymval, Valtype32 tp_offset, | |
4676 | Mips_address addend_a, bool extract_addend, unsigned int r_type) | |
4677 | { | |
4678 | mips_reloc_unshuffle(view, r_type, false); | |
4679 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4680 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4681 | Valtype32 addend = extract_addend ? val & 0xffff : addend_a; | |
4682 | ||
4683 | // tls symbol values are relative to tls_segment()->vaddr() | |
4684 | Valtype32 x = psymval->value(object, addend) - tp_offset; | |
4685 | val = Bits<32>::bit_select32(val, x, 0xffff); | |
4686 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
4687 | mips_reloc_shuffle(view, r_type, false); | |
4688 | return This::STATUS_OKAY; | |
4689 | } | |
4690 | ||
4691 | // R_MIPS_TLS_TPREL32, R_MIPS_TLS_TPREL64, | |
4692 | // R_MIPS_TLS_DTPREL32, R_MIPS_TLS_DTPREL64 | |
4693 | static inline typename This::Status | |
4694 | tlsrel32(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4695 | const Symbol_value<size>* psymval, Valtype32 tp_offset, | |
4696 | Mips_address addend_a, bool extract_addend, unsigned int r_type) | |
4697 | { | |
4698 | mips_reloc_unshuffle(view, r_type, false); | |
4699 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4700 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4701 | Valtype32 addend = extract_addend ? val : addend_a; | |
4702 | ||
4703 | // tls symbol values are relative to tls_segment()->vaddr() | |
4704 | Valtype32 x = psymval->value(object, addend) - tp_offset; | |
4705 | elfcpp::Swap<32, big_endian>::writeval(wv, x); | |
4706 | mips_reloc_shuffle(view, r_type, false); | |
4707 | return This::STATUS_OKAY; | |
4708 | } | |
4709 | ||
4710 | // R_MIPS_SUB, R_MICROMIPS_SUB | |
4711 | static inline typename This::Status | |
4712 | relsub(unsigned char* view, const Mips_relobj<size, big_endian>* object, | |
4713 | const Symbol_value<size>* psymval, Mips_address addend_a, | |
4714 | bool extract_addend, unsigned int r_type) | |
4715 | { | |
4716 | mips_reloc_unshuffle(view, r_type, false); | |
4717 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); | |
4718 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4719 | Valtype32 addend = extract_addend ? val : addend_a; | |
4720 | ||
4721 | Valtype32 x = psymval->value(object, -addend); | |
4722 | elfcpp::Swap<32, big_endian>::writeval(wv, x); | |
4723 | mips_reloc_shuffle(view, r_type, false); | |
4724 | return This::STATUS_OKAY; | |
4725 | } | |
4726 | }; | |
4727 | ||
4728 | template<int size, bool big_endian> | |
4729 | typename std::list<reloc_high<size, big_endian> > | |
4730 | Mips_relocate_functions<size, big_endian>::hi16_relocs; | |
4731 | ||
4732 | template<int size, bool big_endian> | |
4733 | typename std::list<reloc_high<size, big_endian> > | |
4734 | Mips_relocate_functions<size, big_endian>::got16_relocs; | |
4735 | ||
4736 | // Mips_got_info methods. | |
4737 | ||
4738 | // Reserve GOT entry for a GOT relocation of type R_TYPE against symbol | |
4739 | // SYMNDX + ADDEND, where SYMNDX is a local symbol in section SHNDX in OBJECT. | |
4740 | ||
4741 | template<int size, bool big_endian> | |
4742 | void | |
4743 | Mips_got_info<size, big_endian>::record_local_got_symbol( | |
4744 | Mips_relobj<size, big_endian>* object, unsigned int symndx, | |
4745 | Mips_address addend, unsigned int r_type, unsigned int shndx) | |
4746 | { | |
4747 | Mips_got_entry<size, big_endian>* entry = | |
4748 | new Mips_got_entry<size, big_endian>(object, symndx, addend, | |
4749 | mips_elf_reloc_tls_type(r_type), | |
4750 | shndx); | |
4751 | this->record_got_entry(entry, object); | |
4752 | } | |
4753 | ||
4754 | // Reserve GOT entry for a GOT relocation of type R_TYPE against MIPS_SYM, | |
4755 | // in OBJECT. FOR_CALL is true if the caller is only interested in | |
4756 | // using the GOT entry for calls. DYN_RELOC is true if R_TYPE is a dynamic | |
4757 | // relocation. | |
4758 | ||
4759 | template<int size, bool big_endian> | |
4760 | void | |
4761 | Mips_got_info<size, big_endian>::record_global_got_symbol( | |
4762 | Mips_symbol<size>* mips_sym, Mips_relobj<size, big_endian>* object, | |
4763 | unsigned int r_type, bool dyn_reloc, bool for_call) | |
4764 | { | |
4765 | if (!for_call) | |
4766 | mips_sym->set_got_not_only_for_calls(); | |
4767 | ||
4768 | // A global symbol in the GOT must also be in the dynamic symbol table. | |
4769 | if (!mips_sym->needs_dynsym_entry()) | |
4770 | { | |
4771 | switch (mips_sym->visibility()) | |
4772 | { | |
4773 | case elfcpp::STV_INTERNAL: | |
4774 | case elfcpp::STV_HIDDEN: | |
4775 | mips_sym->set_is_forced_local(); | |
4776 | break; | |
4777 | default: | |
4778 | mips_sym->set_needs_dynsym_entry(); | |
4779 | break; | |
4780 | } | |
4781 | } | |
4782 | ||
4783 | unsigned char tls_type = mips_elf_reloc_tls_type(r_type); | |
4784 | if (tls_type == GOT_TLS_NONE) | |
4785 | this->global_got_symbols_.insert(mips_sym); | |
4786 | ||
4787 | if (dyn_reloc) | |
4788 | { | |
4789 | if (mips_sym->global_got_area() == GGA_NONE) | |
4790 | mips_sym->set_global_got_area(GGA_RELOC_ONLY); | |
4791 | return; | |
4792 | } | |
4793 | ||
4794 | Mips_got_entry<size, big_endian>* entry = | |
4795 | new Mips_got_entry<size, big_endian>(object, mips_sym, tls_type); | |
4796 | ||
4797 | this->record_got_entry(entry, object); | |
4798 | } | |
4799 | ||
4800 | // Add ENTRY to master GOT and to OBJECT's GOT. | |
4801 | ||
4802 | template<int size, bool big_endian> | |
4803 | void | |
4804 | Mips_got_info<size, big_endian>::record_got_entry( | |
4805 | Mips_got_entry<size, big_endian>* entry, | |
4806 | Mips_relobj<size, big_endian>* object) | |
4807 | { | |
4808 | if (this->got_entries_.find(entry) == this->got_entries_.end()) | |
4809 | this->got_entries_.insert(entry); | |
4810 | ||
4811 | // Create the GOT entry for the OBJECT's GOT. | |
4812 | Mips_got_info<size, big_endian>* g = object->get_or_create_got_info(); | |
4813 | Mips_got_entry<size, big_endian>* entry2 = | |
4814 | new Mips_got_entry<size, big_endian>(*entry); | |
4815 | ||
4816 | if (g->got_entries_.find(entry2) == g->got_entries_.end()) | |
4817 | g->got_entries_.insert(entry2); | |
4818 | } | |
4819 | ||
4820 | // Record that OBJECT has a page relocation against symbol SYMNDX and | |
4821 | // that ADDEND is the addend for that relocation. | |
4822 | // This function creates an upper bound on the number of GOT slots | |
4823 | // required; no attempt is made to combine references to non-overridable | |
4824 | // global symbols across multiple input files. | |
4825 | ||
4826 | template<int size, bool big_endian> | |
4827 | void | |
4828 | Mips_got_info<size, big_endian>::record_got_page_entry( | |
4829 | Mips_relobj<size, big_endian>* object, unsigned int symndx, int addend) | |
4830 | { | |
4831 | struct Got_page_range **range_ptr, *range; | |
4832 | int old_pages, new_pages; | |
4833 | ||
4834 | // Find the Got_page_entry for this symbol. | |
4835 | Got_page_entry* entry = new Got_page_entry(object, symndx); | |
4836 | typename Got_page_entry_set::iterator it = | |
4837 | this->got_page_entries_.find(entry); | |
4838 | if (it != this->got_page_entries_.end()) | |
4839 | entry = *it; | |
4840 | else | |
4841 | this->got_page_entries_.insert(entry); | |
4842 | ||
4843 | // Add the same entry to the OBJECT's GOT. | |
4844 | Got_page_entry* entry2 = NULL; | |
4845 | Mips_got_info<size, big_endian>* g2 = object->get_or_create_got_info(); | |
4846 | if (g2->got_page_entries_.find(entry) == g2->got_page_entries_.end()) | |
4847 | { | |
4848 | entry2 = new Got_page_entry(*entry); | |
4849 | g2->got_page_entries_.insert(entry2); | |
4850 | } | |
4851 | ||
4852 | // Skip over ranges whose maximum extent cannot share a page entry | |
4853 | // with ADDEND. | |
4854 | range_ptr = &entry->ranges; | |
4855 | while (*range_ptr && addend > (*range_ptr)->max_addend + 0xffff) | |
4856 | range_ptr = &(*range_ptr)->next; | |
4857 | ||
4858 | // If we scanned to the end of the list, or found a range whose | |
4859 | // minimum extent cannot share a page entry with ADDEND, create | |
4860 | // a new singleton range. | |
4861 | range = *range_ptr; | |
4862 | if (!range || addend < range->min_addend - 0xffff) | |
4863 | { | |
4864 | range = new Got_page_range(); | |
4865 | range->next = *range_ptr; | |
4866 | range->min_addend = addend; | |
4867 | range->max_addend = addend; | |
4868 | ||
4869 | *range_ptr = range; | |
4870 | ++entry->num_pages; | |
4871 | if (entry2 != NULL) | |
4872 | ++entry2->num_pages; | |
4873 | ++this->page_gotno_; | |
4874 | ++g2->page_gotno_; | |
4875 | return; | |
4876 | } | |
4877 | ||
4878 | // Remember how many pages the old range contributed. | |
4879 | old_pages = range->get_max_pages(); | |
4880 | ||
4881 | // Update the ranges. | |
4882 | if (addend < range->min_addend) | |
4883 | range->min_addend = addend; | |
4884 | else if (addend > range->max_addend) | |
4885 | { | |
4886 | if (range->next && addend >= range->next->min_addend - 0xffff) | |
4887 | { | |
4888 | old_pages += range->next->get_max_pages(); | |
4889 | range->max_addend = range->next->max_addend; | |
4890 | range->next = range->next->next; | |
4891 | } | |
4892 | else | |
4893 | range->max_addend = addend; | |
4894 | } | |
4895 | ||
4896 | // Record any change in the total estimate. | |
4897 | new_pages = range->get_max_pages(); | |
4898 | if (old_pages != new_pages) | |
4899 | { | |
4900 | entry->num_pages += new_pages - old_pages; | |
4901 | if (entry2 != NULL) | |
4902 | entry2->num_pages += new_pages - old_pages; | |
4903 | this->page_gotno_ += new_pages - old_pages; | |
4904 | g2->page_gotno_ += new_pages - old_pages; | |
4905 | } | |
4906 | } | |
4907 | ||
4908 | // Create all entries that should be in the local part of the GOT. | |
4909 | ||
4910 | template<int size, bool big_endian> | |
4911 | void | |
4912 | Mips_got_info<size, big_endian>::add_local_entries( | |
4913 | Target_mips<size, big_endian>* target, Layout* layout) | |
4914 | { | |
4915 | Mips_output_data_got<size, big_endian>* got = target->got_section(); | |
4916 | // First two GOT entries are reserved. The first entry will be filled at | |
4917 | // runtime. The second entry will be used by some runtime loaders. | |
4918 | got->add_constant(0); | |
4919 | got->add_constant(target->mips_elf_gnu_got1_mask()); | |
4920 | ||
4921 | for (typename Got_entry_set::iterator | |
4922 | p = this->got_entries_.begin(); | |
4923 | p != this->got_entries_.end(); | |
4924 | ++p) | |
4925 | { | |
4926 | Mips_got_entry<size, big_endian>* entry = *p; | |
4927 | if (entry->is_for_local_symbol() && !entry->is_tls_entry()) | |
4928 | { | |
4929 | got->add_local(entry->object(), entry->symndx(), | |
4930 | GOT_TYPE_STANDARD); | |
4931 | unsigned int got_offset = entry->object()->local_got_offset( | |
4932 | entry->symndx(), GOT_TYPE_STANDARD); | |
4933 | if (got->multi_got() && this->index_ > 0 | |
4934 | && parameters->options().output_is_position_independent()) | |
4935 | target->rel_dyn_section(layout)->add_local(entry->object(), | |
4936 | entry->symndx(), elfcpp::R_MIPS_REL32, got, got_offset); | |
4937 | } | |
4938 | } | |
4939 | ||
4940 | this->add_page_entries(target, layout); | |
4941 | ||
4942 | // Add global entries that should be in the local area. | |
4943 | for (typename Got_entry_set::iterator | |
4944 | p = this->got_entries_.begin(); | |
4945 | p != this->got_entries_.end(); | |
4946 | ++p) | |
4947 | { | |
4948 | Mips_got_entry<size, big_endian>* entry = *p; | |
4949 | if (!entry->is_for_global_symbol()) | |
4950 | continue; | |
4951 | ||
4952 | Mips_symbol<size>* mips_sym = entry->sym(); | |
4953 | if (mips_sym->global_got_area() == GGA_NONE && !entry->is_tls_entry()) | |
4954 | { | |
4955 | unsigned int got_type; | |
4956 | if (!got->multi_got()) | |
4957 | got_type = GOT_TYPE_STANDARD; | |
4958 | else | |
4959 | got_type = GOT_TYPE_STANDARD_MULTIGOT + this->index_; | |
4960 | if (got->add_global(mips_sym, got_type)) | |
4961 | { | |
4962 | mips_sym->set_global_gotoffset(mips_sym->got_offset(got_type)); | |
4963 | if (got->multi_got() && this->index_ > 0 | |
4964 | && parameters->options().output_is_position_independent()) | |
4965 | target->rel_dyn_section(layout)->add_symbolless_global_addend( | |
4966 | mips_sym, elfcpp::R_MIPS_REL32, got, | |
4967 | mips_sym->got_offset(got_type)); | |
4968 | } | |
4969 | } | |
4970 | } | |
4971 | } | |
4972 | ||
4973 | // Create GOT page entries. | |
4974 | ||
4975 | template<int size, bool big_endian> | |
4976 | void | |
4977 | Mips_got_info<size, big_endian>::add_page_entries( | |
4978 | Target_mips<size, big_endian>* target, Layout* layout) | |
4979 | { | |
4980 | if (this->page_gotno_ == 0) | |
4981 | return; | |
4982 | ||
4983 | Mips_output_data_got<size, big_endian>* got = target->got_section(); | |
4984 | this->got_page_offset_start_ = got->add_constant(0); | |
4985 | if (got->multi_got() && this->index_ > 0 | |
4986 | && parameters->options().output_is_position_independent()) | |
4987 | target->rel_dyn_section(layout)->add_absolute(elfcpp::R_MIPS_REL32, got, | |
4988 | this->got_page_offset_start_); | |
4989 | int num_entries = this->page_gotno_; | |
4990 | unsigned int prev_offset = this->got_page_offset_start_; | |
4991 | while (--num_entries > 0) | |
4992 | { | |
4993 | unsigned int next_offset = got->add_constant(0); | |
4994 | if (got->multi_got() && this->index_ > 0 | |
4995 | && parameters->options().output_is_position_independent()) | |
4996 | target->rel_dyn_section(layout)->add_absolute(elfcpp::R_MIPS_REL32, got, | |
4997 | next_offset); | |
4998 | gold_assert(next_offset == prev_offset + size/8); | |
4999 | prev_offset = next_offset; | |
5000 | } | |
5001 | this->got_page_offset_next_ = this->got_page_offset_start_; | |
5002 | } | |
5003 | ||
5004 | // Create global GOT entries, both GGA_NORMAL and GGA_RELOC_ONLY. | |
5005 | ||
5006 | template<int size, bool big_endian> | |
5007 | void | |
5008 | Mips_got_info<size, big_endian>::add_global_entries( | |
5009 | Target_mips<size, big_endian>* target, Layout* layout, | |
5010 | unsigned int non_reloc_only_global_gotno) | |
5011 | { | |
5012 | Mips_output_data_got<size, big_endian>* got = target->got_section(); | |
5013 | // Add GGA_NORMAL entries. | |
5014 | unsigned int count = 0; | |
5015 | for (typename Got_entry_set::iterator | |
5016 | p = this->got_entries_.begin(); | |
5017 | p != this->got_entries_.end(); | |
5018 | ++p) | |
5019 | { | |
5020 | Mips_got_entry<size, big_endian>* entry = *p; | |
5021 | if (!entry->is_for_global_symbol()) | |
5022 | continue; | |
5023 | ||
5024 | Mips_symbol<size>* mips_sym = entry->sym(); | |
5025 | if (mips_sym->global_got_area() != GGA_NORMAL) | |
5026 | continue; | |
5027 | ||
5028 | unsigned int got_type; | |
5029 | if (!got->multi_got()) | |
5030 | got_type = GOT_TYPE_STANDARD; | |
5031 | else | |
5032 | // In multi-GOT links, global symbol can be in both primary and | |
5033 | // secondary GOT(s). By creating custom GOT type | |
5034 | // (GOT_TYPE_STANDARD_MULTIGOT + got_index) we ensure that symbol | |
5035 | // is added to secondary GOT(s). | |
5036 | got_type = GOT_TYPE_STANDARD_MULTIGOT + this->index_; | |
5037 | if (!got->add_global(mips_sym, got_type)) | |
5038 | continue; | |
5039 | ||
5040 | mips_sym->set_global_gotoffset(mips_sym->got_offset(got_type)); | |
5041 | if (got->multi_got() && this->index_ == 0) | |
5042 | count++; | |
5043 | if (got->multi_got() && this->index_ > 0) | |
5044 | { | |
5045 | if (parameters->options().output_is_position_independent() | |
5046 | || (!parameters->doing_static_link() | |
5047 | && mips_sym->is_from_dynobj() && !mips_sym->is_undefined())) | |
5048 | { | |
5049 | target->rel_dyn_section(layout)->add_global( | |
5050 | mips_sym, elfcpp::R_MIPS_REL32, got, | |
5051 | mips_sym->got_offset(got_type)); | |
5052 | got->add_secondary_got_reloc(mips_sym->got_offset(got_type), | |
5053 | elfcpp::R_MIPS_REL32, mips_sym); | |
5054 | } | |
5055 | } | |
5056 | } | |
5057 | ||
5058 | if (!got->multi_got() || this->index_ == 0) | |
5059 | { | |
5060 | if (got->multi_got()) | |
5061 | { | |
5062 | // We need to allocate space in the primary GOT for GGA_NORMAL entries | |
5063 | // of secondary GOTs, to ensure that GOT offsets of GGA_RELOC_ONLY | |
5064 | // entries correspond to dynamic symbol indexes. | |
5065 | while (count < non_reloc_only_global_gotno) | |
5066 | { | |
5067 | got->add_constant(0); | |
5068 | ++count; | |
5069 | } | |
5070 | } | |
5071 | ||
5072 | // Add GGA_RELOC_ONLY entries. | |
5073 | got->add_reloc_only_entries(); | |
5074 | } | |
5075 | } | |
5076 | ||
5077 | // Create global GOT entries that should be in the GGA_RELOC_ONLY area. | |
5078 | ||
5079 | template<int size, bool big_endian> | |
5080 | void | |
5081 | Mips_got_info<size, big_endian>::add_reloc_only_entries( | |
5082 | Mips_output_data_got<size, big_endian>* got) | |
5083 | { | |
5084 | for (typename Unordered_set<Mips_symbol<size>*>::iterator | |
5085 | p = this->global_got_symbols_.begin(); | |
5086 | p != this->global_got_symbols_.end(); | |
5087 | ++p) | |
5088 | { | |
5089 | Mips_symbol<size>* mips_sym = *p; | |
5090 | if (mips_sym->global_got_area() == GGA_RELOC_ONLY) | |
5091 | { | |
5092 | unsigned int got_type; | |
5093 | if (!got->multi_got()) | |
5094 | got_type = GOT_TYPE_STANDARD; | |
5095 | else | |
5096 | got_type = GOT_TYPE_STANDARD_MULTIGOT; | |
5097 | if (got->add_global(mips_sym, got_type)) | |
5098 | mips_sym->set_global_gotoffset(mips_sym->got_offset(got_type)); | |
5099 | } | |
5100 | } | |
5101 | } | |
5102 | ||
5103 | // Create TLS GOT entries. | |
5104 | ||
5105 | template<int size, bool big_endian> | |
5106 | void | |
5107 | Mips_got_info<size, big_endian>::add_tls_entries( | |
5108 | Target_mips<size, big_endian>* target, Layout* layout) | |
5109 | { | |
5110 | Mips_output_data_got<size, big_endian>* got = target->got_section(); | |
5111 | // Add local tls entries. | |
5112 | for (typename Got_entry_set::iterator | |
5113 | p = this->got_entries_.begin(); | |
5114 | p != this->got_entries_.end(); | |
5115 | ++p) | |
5116 | { | |
5117 | Mips_got_entry<size, big_endian>* entry = *p; | |
5118 | if (!entry->is_tls_entry() || !entry->is_for_local_symbol()) | |
5119 | continue; | |
5120 | ||
5121 | if (entry->tls_type() == GOT_TLS_GD) | |
5122 | { | |
5123 | unsigned int got_type = GOT_TYPE_TLS_PAIR; | |
5124 | unsigned int r_type1 = (size == 32 ? elfcpp::R_MIPS_TLS_DTPMOD32 | |
5125 | : elfcpp::R_MIPS_TLS_DTPMOD64); | |
5126 | unsigned int r_type2 = (size == 32 ? elfcpp::R_MIPS_TLS_DTPREL32 | |
5127 | : elfcpp::R_MIPS_TLS_DTPREL64); | |
5128 | ||
5129 | if (!parameters->doing_static_link()) | |
5130 | { | |
5131 | got->add_local_pair_with_rel(entry->object(), entry->symndx(), | |
5132 | entry->shndx(), got_type, | |
5133 | target->rel_dyn_section(layout), | |
5134 | r_type1); | |
5135 | unsigned int got_offset = | |
5136 | entry->object()->local_got_offset(entry->symndx(), got_type); | |
5137 | got->add_static_reloc(got_offset + size/8, r_type2, | |
5138 | entry->object(), entry->symndx()); | |
5139 | } | |
5140 | else | |
5141 | { | |
5142 | // We are doing a static link. Mark it as belong to module 1, | |
5143 | // the executable. | |
5144 | unsigned int got_offset = got->add_constant(1); | |
5145 | entry->object()->set_local_got_offset(entry->symndx(), got_type, | |
5146 | got_offset); | |
5147 | got->add_constant(0); | |
5148 | got->add_static_reloc(got_offset + size/8, r_type2, | |
5149 | entry->object(), entry->symndx()); | |
5150 | } | |
5151 | } | |
5152 | else if (entry->tls_type() == GOT_TLS_IE) | |
5153 | { | |
5154 | unsigned int got_type = GOT_TYPE_TLS_OFFSET; | |
5155 | unsigned int r_type = (size == 32 ? elfcpp::R_MIPS_TLS_TPREL32 | |
5156 | : elfcpp::R_MIPS_TLS_TPREL64); | |
5157 | if (!parameters->doing_static_link()) | |
5158 | got->add_local_with_rel(entry->object(), entry->symndx(), got_type, | |
5159 | target->rel_dyn_section(layout), r_type); | |
5160 | else | |
5161 | { | |
5162 | got->add_local(entry->object(), entry->symndx(), got_type); | |
5163 | unsigned int got_offset = | |
5164 | entry->object()->local_got_offset(entry->symndx(), got_type); | |
5165 | got->add_static_reloc(got_offset, r_type, entry->object(), | |
5166 | entry->symndx()); | |
5167 | } | |
5168 | } | |
5169 | else if (entry->tls_type() == GOT_TLS_LDM) | |
5170 | { | |
5171 | unsigned int r_type = (size == 32 ? elfcpp::R_MIPS_TLS_DTPMOD32 | |
5172 | : elfcpp::R_MIPS_TLS_DTPMOD64); | |
5173 | unsigned int got_offset; | |
5174 | if (!parameters->doing_static_link()) | |
5175 | { | |
5176 | got_offset = got->add_constant(0); | |
5177 | target->rel_dyn_section(layout)->add_local( | |
5178 | entry->object(), 0, r_type, got, got_offset); | |
5179 | } | |
5180 | else | |
5181 | // We are doing a static link. Just mark it as belong to module 1, | |
5182 | // the executable. | |
5183 | got_offset = got->add_constant(1); | |
5184 | ||
5185 | got->add_constant(0); | |
5186 | got->set_tls_ldm_offset(got_offset, entry->object()); | |
5187 | } | |
5188 | else | |
5189 | gold_unreachable(); | |
5190 | } | |
5191 | ||
5192 | // Add global tls entries. | |
5193 | for (typename Got_entry_set::iterator | |
5194 | p = this->got_entries_.begin(); | |
5195 | p != this->got_entries_.end(); | |
5196 | ++p) | |
5197 | { | |
5198 | Mips_got_entry<size, big_endian>* entry = *p; | |
5199 | if (!entry->is_tls_entry() || !entry->is_for_global_symbol()) | |
5200 | continue; | |
5201 | ||
5202 | Mips_symbol<size>* mips_sym = entry->sym(); | |
5203 | if (entry->tls_type() == GOT_TLS_GD) | |
5204 | { | |
5205 | unsigned int got_type; | |
5206 | if (!got->multi_got()) | |
5207 | got_type = GOT_TYPE_TLS_PAIR; | |
5208 | else | |
5209 | got_type = GOT_TYPE_TLS_PAIR_MULTIGOT + this->index_; | |
5210 | unsigned int r_type1 = (size == 32 ? elfcpp::R_MIPS_TLS_DTPMOD32 | |
5211 | : elfcpp::R_MIPS_TLS_DTPMOD64); | |
5212 | unsigned int r_type2 = (size == 32 ? elfcpp::R_MIPS_TLS_DTPREL32 | |
5213 | : elfcpp::R_MIPS_TLS_DTPREL64); | |
5214 | if (!parameters->doing_static_link()) | |
5215 | got->add_global_pair_with_rel(mips_sym, got_type, | |
5216 | target->rel_dyn_section(layout), r_type1, r_type2); | |
5217 | else | |
5218 | { | |
5219 | // Add a GOT pair for for R_MIPS_TLS_GD. The creates a pair of | |
5220 | // GOT entries. The first one is initialized to be 1, which is the | |
5221 | // module index for the main executable and the second one 0. A | |
5222 | // reloc of the type R_MIPS_TLS_DTPREL32/64 will be created for | |
5223 | // the second GOT entry and will be applied by gold. | |
5224 | unsigned int got_offset = got->add_constant(1); | |
5225 | mips_sym->set_got_offset(got_type, got_offset); | |
5226 | got->add_constant(0); | |
5227 | got->add_static_reloc(got_offset + size/8, r_type2, mips_sym); | |
5228 | } | |
5229 | } | |
5230 | else if (entry->tls_type() == GOT_TLS_IE) | |
5231 | { | |
5232 | unsigned int got_type; | |
5233 | if (!got->multi_got()) | |
5234 | got_type = GOT_TYPE_TLS_OFFSET; | |
5235 | else | |
5236 | got_type = GOT_TYPE_TLS_OFFSET_MULTIGOT + this->index_; | |
5237 | unsigned int r_type = (size == 32 ? elfcpp::R_MIPS_TLS_TPREL32 | |
5238 | : elfcpp::R_MIPS_TLS_TPREL64); | |
5239 | if (!parameters->doing_static_link()) | |
5240 | got->add_global_with_rel(mips_sym, got_type, | |
5241 | target->rel_dyn_section(layout), r_type); | |
5242 | else | |
5243 | { | |
5244 | got->add_global(mips_sym, got_type); | |
5245 | unsigned int got_offset = mips_sym->got_offset(got_type); | |
5246 | got->add_static_reloc(got_offset, r_type, mips_sym); | |
5247 | } | |
5248 | } | |
5249 | else | |
5250 | gold_unreachable(); | |
5251 | } | |
5252 | } | |
5253 | ||
5254 | // Decide whether the symbol needs an entry in the global part of the primary | |
5255 | // GOT, setting global_got_area accordingly. Count the number of global | |
5256 | // symbols that are in the primary GOT only because they have dynamic | |
5257 | // relocations R_MIPS_REL32 against them (reloc_only_gotno). | |
5258 | ||
5259 | template<int size, bool big_endian> | |
5260 | void | |
5261 | Mips_got_info<size, big_endian>::count_got_symbols(Symbol_table* symtab) | |
5262 | { | |
5263 | for (typename Unordered_set<Mips_symbol<size>*>::iterator | |
5264 | p = this->global_got_symbols_.begin(); | |
5265 | p != this->global_got_symbols_.end(); | |
5266 | ++p) | |
5267 | { | |
5268 | Mips_symbol<size>* sym = *p; | |
5269 | // Make a final decision about whether the symbol belongs in the | |
5270 | // local or global GOT. Symbols that bind locally can (and in the | |
5271 | // case of forced-local symbols, must) live in the local GOT. | |
5272 | // Those that are aren't in the dynamic symbol table must also | |
5273 | // live in the local GOT. | |
5274 | ||
5275 | if (!sym->should_add_dynsym_entry(symtab) | |
5276 | || (sym->got_only_for_calls() | |
5277 | ? symbol_calls_local(sym, sym->should_add_dynsym_entry(symtab)) | |
5278 | : symbol_references_local(sym, | |
5279 | sym->should_add_dynsym_entry(symtab)))) | |
5280 | // The symbol belongs in the local GOT. We no longer need this | |
5281 | // entry if it was only used for relocations; those relocations | |
5282 | // will be against the null or section symbol instead. | |
5283 | sym->set_global_got_area(GGA_NONE); | |
5284 | else if (sym->global_got_area() == GGA_RELOC_ONLY) | |
5285 | { | |
5286 | ++this->reloc_only_gotno_; | |
5287 | ++this->global_gotno_ ; | |
5288 | } | |
5289 | } | |
5290 | } | |
5291 | ||
5292 | // Return the offset of GOT page entry for VALUE. Initialize the entry with | |
5293 | // VALUE if it is not initialized. | |
5294 | ||
5295 | template<int size, bool big_endian> | |
5296 | unsigned int | |
5297 | Mips_got_info<size, big_endian>::get_got_page_offset(Mips_address value, | |
5298 | Mips_output_data_got<size, big_endian>* got) | |
5299 | { | |
5300 | typename Got_page_offsets::iterator it = this->got_page_offsets_.find(value); | |
5301 | if (it != this->got_page_offsets_.end()) | |
5302 | return it->second; | |
5303 | ||
5304 | gold_assert(this->got_page_offset_next_ < this->got_page_offset_start_ | |
5305 | + (size/8) * this->page_gotno_); | |
5306 | ||
5307 | unsigned int got_offset = this->got_page_offset_next_; | |
5308 | this->got_page_offsets_[value] = got_offset; | |
5309 | this->got_page_offset_next_ += size/8; | |
5310 | got->update_got_entry(got_offset, value); | |
5311 | return got_offset; | |
5312 | } | |
5313 | ||
5314 | // Remove lazy-binding stubs for global symbols in this GOT. | |
5315 | ||
5316 | template<int size, bool big_endian> | |
5317 | void | |
5318 | Mips_got_info<size, big_endian>::remove_lazy_stubs( | |
5319 | Target_mips<size, big_endian>* target) | |
5320 | { | |
5321 | for (typename Got_entry_set::iterator | |
5322 | p = this->got_entries_.begin(); | |
5323 | p != this->got_entries_.end(); | |
5324 | ++p) | |
5325 | { | |
5326 | Mips_got_entry<size, big_endian>* entry = *p; | |
5327 | if (entry->is_for_global_symbol()) | |
5328 | target->remove_lazy_stub_entry(entry->sym()); | |
5329 | } | |
5330 | } | |
5331 | ||
5332 | // Count the number of GOT entries required. | |
5333 | ||
5334 | template<int size, bool big_endian> | |
5335 | void | |
5336 | Mips_got_info<size, big_endian>::count_got_entries() | |
5337 | { | |
5338 | for (typename Got_entry_set::iterator | |
5339 | p = this->got_entries_.begin(); | |
5340 | p != this->got_entries_.end(); | |
5341 | ++p) | |
5342 | { | |
5343 | this->count_got_entry(*p); | |
5344 | } | |
5345 | } | |
5346 | ||
5347 | // Count the number of GOT entries required by ENTRY. Accumulate the result. | |
5348 | ||
5349 | template<int size, bool big_endian> | |
5350 | void | |
5351 | Mips_got_info<size, big_endian>::count_got_entry( | |
5352 | Mips_got_entry<size, big_endian>* entry) | |
5353 | { | |
5354 | if (entry->is_tls_entry()) | |
5355 | this->tls_gotno_ += mips_tls_got_entries(entry->tls_type()); | |
5356 | else if (entry->is_for_local_symbol() | |
5357 | || entry->sym()->global_got_area() == GGA_NONE) | |
5358 | ++this->local_gotno_; | |
5359 | else | |
5360 | ++this->global_gotno_; | |
5361 | } | |
5362 | ||
5363 | // Add FROM's GOT entries. | |
5364 | ||
5365 | template<int size, bool big_endian> | |
5366 | void | |
5367 | Mips_got_info<size, big_endian>::add_got_entries( | |
5368 | Mips_got_info<size, big_endian>* from) | |
5369 | { | |
5370 | for (typename Got_entry_set::iterator | |
5371 | p = from->got_entries_.begin(); | |
5372 | p != from->got_entries_.end(); | |
5373 | ++p) | |
5374 | { | |
5375 | Mips_got_entry<size, big_endian>* entry = *p; | |
5376 | if (this->got_entries_.find(entry) == this->got_entries_.end()) | |
5377 | { | |
5378 | Mips_got_entry<size, big_endian>* entry2 = | |
5379 | new Mips_got_entry<size, big_endian>(*entry); | |
5380 | this->got_entries_.insert(entry2); | |
5381 | this->count_got_entry(entry); | |
5382 | } | |
5383 | } | |
5384 | } | |
5385 | ||
5386 | // Add FROM's GOT page entries. | |
5387 | ||
5388 | template<int size, bool big_endian> | |
5389 | void | |
5390 | Mips_got_info<size, big_endian>::add_got_page_entries( | |
5391 | Mips_got_info<size, big_endian>* from) | |
5392 | { | |
5393 | for (typename Got_page_entry_set::iterator | |
5394 | p = from->got_page_entries_.begin(); | |
5395 | p != from->got_page_entries_.end(); | |
5396 | ++p) | |
5397 | { | |
5398 | Got_page_entry* entry = *p; | |
5399 | if (this->got_page_entries_.find(entry) == this->got_page_entries_.end()) | |
5400 | { | |
5401 | Got_page_entry* entry2 = new Got_page_entry(*entry); | |
5402 | this->got_page_entries_.insert(entry2); | |
5403 | this->page_gotno_ += entry->num_pages; | |
5404 | } | |
5405 | } | |
5406 | } | |
5407 | ||
5408 | // Mips_output_data_got methods. | |
5409 | ||
5410 | // Lay out the GOT. Add local, global and TLS entries. If GOT is | |
5411 | // larger than 64K, create multi-GOT. | |
5412 | ||
5413 | template<int size, bool big_endian> | |
5414 | void | |
5415 | Mips_output_data_got<size, big_endian>::lay_out_got(Layout* layout, | |
5416 | Symbol_table* symtab, const Input_objects* input_objects) | |
5417 | { | |
5418 | // Decide which symbols need to go in the global part of the GOT and | |
5419 | // count the number of reloc-only GOT symbols. | |
5420 | this->master_got_info_->count_got_symbols(symtab); | |
5421 | ||
5422 | // Count the number of GOT entries. | |
5423 | this->master_got_info_->count_got_entries(); | |
5424 | ||
5425 | unsigned int got_size = this->master_got_info_->got_size(); | |
5426 | if (got_size > Target_mips<size, big_endian>::MIPS_GOT_MAX_SIZE) | |
5427 | this->lay_out_multi_got(layout, input_objects); | |
5428 | else | |
5429 | { | |
5430 | // Record that all objects use single GOT. | |
5431 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
5432 | p != input_objects->relobj_end(); | |
5433 | ++p) | |
5434 | { | |
5435 | Mips_relobj<size, big_endian>* object = | |
5436 | Mips_relobj<size, big_endian>::as_mips_relobj(*p); | |
5437 | if (object->get_got_info() != NULL) | |
5438 | object->set_got_info(this->master_got_info_); | |
5439 | } | |
5440 | ||
5441 | this->master_got_info_->add_local_entries(this->target_, layout); | |
5442 | this->master_got_info_->add_global_entries(this->target_, layout, | |
5443 | /*not used*/-1U); | |
5444 | this->master_got_info_->add_tls_entries(this->target_, layout); | |
5445 | } | |
5446 | } | |
5447 | ||
5448 | // Create multi-GOT. For every GOT, add local, global and TLS entries. | |
5449 | ||
5450 | template<int size, bool big_endian> | |
5451 | void | |
5452 | Mips_output_data_got<size, big_endian>::lay_out_multi_got(Layout* layout, | |
5453 | const Input_objects* input_objects) | |
5454 | { | |
5455 | // Try to merge the GOTs of input objects together, as long as they | |
5456 | // don't seem to exceed the maximum GOT size, choosing one of them | |
5457 | // to be the primary GOT. | |
5458 | this->merge_gots(input_objects); | |
5459 | ||
5460 | // Every symbol that is referenced in a dynamic relocation must be | |
5461 | // present in the primary GOT. | |
5462 | this->primary_got_->set_global_gotno(this->master_got_info_->global_gotno()); | |
5463 | ||
5464 | // Add GOT entries. | |
5465 | unsigned int i = 0; | |
5466 | unsigned int offset = 0; | |
5467 | Mips_got_info<size, big_endian>* g = this->primary_got_; | |
5468 | do | |
5469 | { | |
5470 | g->set_index(i); | |
5471 | g->set_offset(offset); | |
5472 | ||
5473 | g->add_local_entries(this->target_, layout); | |
5474 | if (i == 0) | |
5475 | g->add_global_entries(this->target_, layout, | |
5476 | (this->master_got_info_->global_gotno() | |
5477 | - this->master_got_info_->reloc_only_gotno())); | |
5478 | else | |
5479 | g->add_global_entries(this->target_, layout, /*not used*/-1U); | |
5480 | g->add_tls_entries(this->target_, layout); | |
5481 | ||
5482 | // Forbid global symbols in every non-primary GOT from having | |
5483 | // lazy-binding stubs. | |
5484 | if (i > 0) | |
5485 | g->remove_lazy_stubs(this->target_); | |
5486 | ||
5487 | ++i; | |
5488 | offset += g->got_size(); | |
5489 | g = g->next(); | |
5490 | } | |
5491 | while (g); | |
5492 | } | |
5493 | ||
5494 | // Attempt to merge GOTs of different input objects. Try to use as much as | |
5495 | // possible of the primary GOT, since it doesn't require explicit dynamic | |
5496 | // relocations, but don't use objects that would reference global symbols | |
5497 | // out of the addressable range. Failing the primary GOT, attempt to merge | |
5498 | // with the current GOT, or finish the current GOT and then make make the new | |
5499 | // GOT current. | |
5500 | ||
5501 | template<int size, bool big_endian> | |
5502 | void | |
5503 | Mips_output_data_got<size, big_endian>::merge_gots( | |
5504 | const Input_objects* input_objects) | |
5505 | { | |
5506 | gold_assert(this->primary_got_ == NULL); | |
5507 | Mips_got_info<size, big_endian>* current = NULL; | |
5508 | ||
5509 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
5510 | p != input_objects->relobj_end(); | |
5511 | ++p) | |
5512 | { | |
5513 | Mips_relobj<size, big_endian>* object = | |
5514 | Mips_relobj<size, big_endian>::as_mips_relobj(*p); | |
5515 | ||
5516 | Mips_got_info<size, big_endian>* g = object->get_got_info(); | |
5517 | if (g == NULL) | |
5518 | continue; | |
5519 | ||
5520 | g->count_got_entries(); | |
5521 | ||
5522 | // Work out the number of page, local and TLS entries. | |
5523 | unsigned int estimate = this->master_got_info_->page_gotno(); | |
5524 | if (estimate > g->page_gotno()) | |
5525 | estimate = g->page_gotno(); | |
5526 | estimate += g->local_gotno() + g->tls_gotno(); | |
5527 | ||
5528 | // We place TLS GOT entries after both locals and globals. The globals | |
5529 | // for the primary GOT may overflow the normal GOT size limit, so be | |
5530 | // sure not to merge a GOT which requires TLS with the primary GOT in that | |
5531 | // case. This doesn't affect non-primary GOTs. | |
5532 | estimate += (g->tls_gotno() > 0 ? this->master_got_info_->global_gotno() | |
5533 | : g->global_gotno()); | |
5534 | ||
5535 | unsigned int max_count = | |
5536 | Target_mips<size, big_endian>::MIPS_GOT_MAX_SIZE / (size/8) - 2; | |
5537 | if (estimate <= max_count) | |
5538 | { | |
5539 | // If we don't have a primary GOT, use it as | |
5540 | // a starting point for the primary GOT. | |
5541 | if (!this->primary_got_) | |
5542 | { | |
5543 | this->primary_got_ = g; | |
5544 | continue; | |
5545 | } | |
5546 | ||
5547 | // Try merging with the primary GOT. | |
5548 | if (this->merge_got_with(g, object, this->primary_got_)) | |
5549 | continue; | |
5550 | } | |
5551 | ||
5552 | // If we can merge with the last-created GOT, do it. | |
5553 | if (current && this->merge_got_with(g, object, current)) | |
5554 | continue; | |
5555 | ||
5556 | // Well, we couldn't merge, so create a new GOT. Don't check if it | |
5557 | // fits; if it turns out that it doesn't, we'll get relocation | |
5558 | // overflows anyway. | |
5559 | g->set_next(current); | |
5560 | current = g; | |
5561 | } | |
5562 | ||
5563 | // If we do not find any suitable primary GOT, create an empty one. | |
5564 | if (this->primary_got_ == NULL) | |
5565 | this->primary_got_ = new Mips_got_info<size, big_endian>(); | |
5566 | ||
5567 | // Link primary GOT with secondary GOTs. | |
5568 | this->primary_got_->set_next(current); | |
5569 | } | |
5570 | ||
5571 | // Consider merging FROM, which is OBJECT's GOT, into TO. Return false if | |
5572 | // this would lead to overflow, true if they were merged successfully. | |
5573 | ||
5574 | template<int size, bool big_endian> | |
5575 | bool | |
5576 | Mips_output_data_got<size, big_endian>::merge_got_with( | |
5577 | Mips_got_info<size, big_endian>* from, | |
5578 | Mips_relobj<size, big_endian>* object, | |
5579 | Mips_got_info<size, big_endian>* to) | |
5580 | { | |
5581 | // Work out how many page entries we would need for the combined GOT. | |
5582 | unsigned int estimate = this->master_got_info_->page_gotno(); | |
5583 | if (estimate >= from->page_gotno() + to->page_gotno()) | |
5584 | estimate = from->page_gotno() + to->page_gotno(); | |
5585 | ||
5586 | // Conservatively estimate how many local and TLS entries would be needed. | |
5587 | estimate += from->local_gotno() + to->local_gotno(); | |
5588 | estimate += from->tls_gotno() + to->tls_gotno(); | |
5589 | ||
5590 | // If we're merging with the primary got, any TLS relocations will | |
5591 | // come after the full set of global entries. Otherwise estimate those | |
5592 | // conservatively as well. | |
5593 | if (to == this->primary_got_ && (from->tls_gotno() + to->tls_gotno()) > 0) | |
5594 | estimate += this->master_got_info_->global_gotno(); | |
5595 | else | |
5596 | estimate += from->global_gotno() + to->global_gotno(); | |
5597 | ||
5598 | // Bail out if the combined GOT might be too big. | |
5599 | unsigned int max_count = | |
5600 | Target_mips<size, big_endian>::MIPS_GOT_MAX_SIZE / (size/8) - 2; | |
5601 | if (estimate > max_count) | |
5602 | return false; | |
5603 | ||
5604 | // Transfer the object's GOT information from FROM to TO. | |
5605 | to->add_got_entries(from); | |
5606 | to->add_got_page_entries(from); | |
5607 | ||
5608 | // Record that OBJECT should use output GOT TO. | |
5609 | object->set_got_info(to); | |
5610 | ||
5611 | return true; | |
5612 | } | |
5613 | ||
5614 | // Write out the GOT. | |
5615 | ||
5616 | template<int size, bool big_endian> | |
5617 | void | |
5618 | Mips_output_data_got<size, big_endian>::do_write(Output_file* of) | |
5619 | { | |
5620 | // Call parent to write out GOT. | |
5621 | Output_data_got<size, big_endian>::do_write(of); | |
5622 | ||
5623 | const off_t offset = this->offset(); | |
5624 | const section_size_type oview_size = | |
5625 | convert_to_section_size_type(this->data_size()); | |
5626 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
5627 | ||
5628 | // Needed for fixing values of .got section. | |
5629 | this->got_view_ = oview; | |
5630 | ||
5631 | // Write lazy stub addresses. | |
5632 | for (typename Unordered_set<Mips_symbol<size>*>::iterator | |
5633 | p = this->master_got_info_->global_got_symbols().begin(); | |
5634 | p != this->master_got_info_->global_got_symbols().end(); | |
5635 | ++p) | |
5636 | { | |
5637 | Mips_symbol<size>* mips_sym = *p; | |
5638 | if (mips_sym->has_lazy_stub()) | |
5639 | { | |
5640 | Valtype* wv = reinterpret_cast<Valtype*>( | |
5641 | oview + this->get_primary_got_offset(mips_sym)); | |
5642 | Valtype value = | |
5643 | this->target_->mips_stubs_section()->stub_address(mips_sym); | |
5644 | elfcpp::Swap<size, big_endian>::writeval(wv, value); | |
5645 | } | |
5646 | } | |
5647 | ||
5648 | // Add +1 to GGA_NONE nonzero MIPS16 and microMIPS entries. | |
5649 | for (typename Unordered_set<Mips_symbol<size>*>::iterator | |
5650 | p = this->master_got_info_->global_got_symbols().begin(); | |
5651 | p != this->master_got_info_->global_got_symbols().end(); | |
5652 | ++p) | |
5653 | { | |
5654 | Mips_symbol<size>* mips_sym = *p; | |
5655 | if (!this->multi_got() | |
5656 | && (mips_sym->is_mips16() || mips_sym->is_micromips()) | |
5657 | && mips_sym->global_got_area() == GGA_NONE | |
5658 | && mips_sym->has_got_offset(GOT_TYPE_STANDARD)) | |
5659 | { | |
5660 | Valtype* wv = reinterpret_cast<Valtype*>( | |
5661 | oview + mips_sym->got_offset(GOT_TYPE_STANDARD)); | |
5662 | Valtype value = elfcpp::Swap<size, big_endian>::readval(wv); | |
5663 | if (value != 0) | |
5664 | { | |
5665 | value |= 1; | |
5666 | elfcpp::Swap<size, big_endian>::writeval(wv, value); | |
5667 | } | |
5668 | } | |
5669 | } | |
5670 | ||
5671 | if (!this->secondary_got_relocs_.empty()) | |
5672 | { | |
5673 | // Fixup for the secondary GOT R_MIPS_REL32 relocs. For global | |
5674 | // secondary GOT entries with non-zero initial value copy the value | |
5675 | // to the corresponding primary GOT entry, and set the secondary GOT | |
5676 | // entry to zero. | |
5677 | // TODO(sasa): This is workaround. It needs to be investigated further. | |
5678 | ||
5679 | for (size_t i = 0; i < this->secondary_got_relocs_.size(); ++i) | |
5680 | { | |
5681 | Static_reloc& reloc(this->secondary_got_relocs_[i]); | |
5682 | if (reloc.symbol_is_global()) | |
5683 | { | |
5684 | Mips_symbol<size>* gsym = reloc.symbol(); | |
5685 | gold_assert(gsym != NULL); | |
5686 | ||
5687 | unsigned got_offset = reloc.got_offset(); | |
5688 | gold_assert(got_offset < oview_size); | |
5689 | ||
5690 | // Find primary GOT entry. | |
5691 | Valtype* wv_prim = reinterpret_cast<Valtype*>( | |
5692 | oview + this->get_primary_got_offset(gsym)); | |
5693 | ||
5694 | // Find secondary GOT entry. | |
5695 | Valtype* wv_sec = reinterpret_cast<Valtype*>(oview + got_offset); | |
5696 | ||
5697 | Valtype value = elfcpp::Swap<size, big_endian>::readval(wv_sec); | |
5698 | if (value != 0) | |
5699 | { | |
5700 | elfcpp::Swap<size, big_endian>::writeval(wv_prim, value); | |
5701 | elfcpp::Swap<size, big_endian>::writeval(wv_sec, 0); | |
5702 | gsym->set_applied_secondary_got_fixup(); | |
5703 | } | |
5704 | } | |
5705 | } | |
5706 | ||
5707 | of->write_output_view(offset, oview_size, oview); | |
5708 | } | |
5709 | ||
5710 | // We are done if there is no fix up. | |
5711 | if (this->static_relocs_.empty()) | |
5712 | return; | |
5713 | ||
5714 | Output_segment* tls_segment = this->layout_->tls_segment(); | |
5715 | gold_assert(tls_segment != NULL); | |
5716 | ||
5717 | for (size_t i = 0; i < this->static_relocs_.size(); ++i) | |
5718 | { | |
5719 | Static_reloc& reloc(this->static_relocs_[i]); | |
5720 | ||
5721 | Mips_address value; | |
5722 | if (!reloc.symbol_is_global()) | |
5723 | { | |
5724 | Sized_relobj_file<size, big_endian>* object = reloc.relobj(); | |
5725 | const Symbol_value<size>* psymval = | |
5726 | object->local_symbol(reloc.index()); | |
5727 | ||
5728 | // We are doing static linking. Issue an error and skip this | |
5729 | // relocation if the symbol is undefined or in a discarded_section. | |
5730 | bool is_ordinary; | |
5731 | unsigned int shndx = psymval->input_shndx(&is_ordinary); | |
5732 | if ((shndx == elfcpp::SHN_UNDEF) | |
5733 | || (is_ordinary | |
5734 | && shndx != elfcpp::SHN_UNDEF | |
5735 | && !object->is_section_included(shndx) | |
5736 | && !this->symbol_table_->is_section_folded(object, shndx))) | |
5737 | { | |
5738 | gold_error(_("undefined or discarded local symbol %u from " | |
5739 | " object %s in GOT"), | |
5740 | reloc.index(), reloc.relobj()->name().c_str()); | |
5741 | continue; | |
5742 | } | |
5743 | ||
5744 | value = psymval->value(object, 0); | |
5745 | } | |
5746 | else | |
5747 | { | |
5748 | const Mips_symbol<size>* gsym = reloc.symbol(); | |
5749 | gold_assert(gsym != NULL); | |
5750 | ||
5751 | // We are doing static linking. Issue an error and skip this | |
5752 | // relocation if the symbol is undefined or in a discarded_section | |
5753 | // unless it is a weakly_undefined symbol. | |
5754 | if ((gsym->is_defined_in_discarded_section() || gsym->is_undefined()) | |
5755 | && !gsym->is_weak_undefined()) | |
5756 | { | |
5757 | gold_error(_("undefined or discarded symbol %s in GOT"), | |
5758 | gsym->name()); | |
5759 | continue; | |
5760 | } | |
5761 | ||
5762 | if (!gsym->is_weak_undefined()) | |
5763 | value = gsym->value(); | |
5764 | else | |
5765 | value = 0; | |
5766 | } | |
5767 | ||
5768 | unsigned got_offset = reloc.got_offset(); | |
5769 | gold_assert(got_offset < oview_size); | |
5770 | ||
5771 | Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset); | |
5772 | Valtype x; | |
5773 | ||
5774 | switch (reloc.r_type()) | |
5775 | { | |
5776 | case elfcpp::R_MIPS_TLS_DTPMOD32: | |
5777 | case elfcpp::R_MIPS_TLS_DTPMOD64: | |
5778 | x = value; | |
5779 | break; | |
5780 | case elfcpp::R_MIPS_TLS_DTPREL32: | |
5781 | case elfcpp::R_MIPS_TLS_DTPREL64: | |
5782 | x = value - elfcpp::DTP_OFFSET; | |
5783 | break; | |
5784 | case elfcpp::R_MIPS_TLS_TPREL32: | |
5785 | case elfcpp::R_MIPS_TLS_TPREL64: | |
5786 | x = value - elfcpp::TP_OFFSET; | |
5787 | break; | |
5788 | default: | |
5789 | gold_unreachable(); | |
5790 | break; | |
5791 | } | |
5792 | ||
5793 | elfcpp::Swap<size, big_endian>::writeval(wv, x); | |
5794 | } | |
5795 | ||
5796 | of->write_output_view(offset, oview_size, oview); | |
5797 | } | |
5798 | ||
5799 | // Mips_relobj methods. | |
5800 | ||
5801 | // Count the local symbols. The Mips backend needs to know if a symbol | |
5802 | // is a MIPS16 or microMIPS function or not. For global symbols, it is easy | |
5803 | // because the Symbol object keeps the ELF symbol type and st_other field. | |
5804 | // For local symbol it is harder because we cannot access this information. | |
5805 | // So we override the do_count_local_symbol in parent and scan local symbols to | |
5806 | // mark MIPS16 and microMIPS functions. This is not the most efficient way but | |
5807 | // I do not want to slow down other ports by calling a per symbol target hook | |
5808 | // inside Sized_relobj_file<size, big_endian>::do_count_local_symbols. | |
5809 | ||
5810 | template<int size, bool big_endian> | |
5811 | void | |
5812 | Mips_relobj<size, big_endian>::do_count_local_symbols( | |
5813 | Stringpool_template<char>* pool, | |
5814 | Stringpool_template<char>* dynpool) | |
5815 | { | |
5816 | // Ask parent to count the local symbols. | |
5817 | Sized_relobj_file<size, big_endian>::do_count_local_symbols(pool, dynpool); | |
5818 | const unsigned int loccount = this->local_symbol_count(); | |
5819 | if (loccount == 0) | |
5820 | return; | |
5821 | ||
5822 | // Initialize the mips16 and micromips function bit-vector. | |
5823 | this->local_symbol_is_mips16_.resize(loccount, false); | |
5824 | this->local_symbol_is_micromips_.resize(loccount, false); | |
5825 | ||
5826 | // Read the symbol table section header. | |
5827 | const unsigned int symtab_shndx = this->symtab_shndx(); | |
5828 | elfcpp::Shdr<size, big_endian> | |
5829 | symtabshdr(this, this->elf_file()->section_header(symtab_shndx)); | |
5830 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); | |
5831 | ||
5832 | // Read the local symbols. | |
5833 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
5834 | gold_assert(loccount == symtabshdr.get_sh_info()); | |
5835 | off_t locsize = loccount * sym_size; | |
5836 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), | |
5837 | locsize, true, true); | |
5838 | ||
5839 | // Loop over the local symbols and mark any MIPS16 or microMIPS local symbols. | |
5840 | ||
5841 | // Skip the first dummy symbol. | |
5842 | psyms += sym_size; | |
5843 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) | |
5844 | { | |
5845 | elfcpp::Sym<size, big_endian> sym(psyms); | |
5846 | unsigned char st_other = sym.get_st_other(); | |
5847 | this->local_symbol_is_mips16_[i] = elfcpp::elf_st_is_mips16(st_other); | |
5848 | this->local_symbol_is_micromips_[i] = | |
5849 | elfcpp::elf_st_is_micromips(st_other); | |
5850 | } | |
5851 | } | |
5852 | ||
5853 | // Read the symbol information. | |
5854 | ||
5855 | template<int size, bool big_endian> | |
5856 | void | |
5857 | Mips_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) | |
5858 | { | |
5859 | // Call parent class to read symbol information. | |
f35c4853 | 5860 | this->base_read_symbols(sd); |
9810d34d SS |
5861 | |
5862 | // Read processor-specific flags in ELF file header. | |
5863 | const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset, | |
5864 | elfcpp::Elf_sizes<size>::ehdr_size, | |
5865 | true, false); | |
5866 | elfcpp::Ehdr<size, big_endian> ehdr(pehdr); | |
5867 | this->processor_specific_flags_ = ehdr.get_e_flags(); | |
5868 | ||
5869 | // Get the section names. | |
5870 | const unsigned char* pnamesu = sd->section_names->data(); | |
5871 | const char* pnames = reinterpret_cast<const char*>(pnamesu); | |
5872 | ||
5873 | // Initialize the mips16 stub section bit-vectors. | |
5874 | this->section_is_mips16_fn_stub_.resize(this->shnum(), false); | |
5875 | this->section_is_mips16_call_stub_.resize(this->shnum(), false); | |
5876 | this->section_is_mips16_call_fp_stub_.resize(this->shnum(), false); | |
5877 | ||
5878 | const size_t shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
5879 | const unsigned char* pshdrs = sd->section_headers->data(); | |
5880 | const unsigned char* ps = pshdrs + shdr_size; | |
5881 | for (unsigned int i = 1; i < this->shnum(); ++i, ps += shdr_size) | |
5882 | { | |
5883 | elfcpp::Shdr<size, big_endian> shdr(ps); | |
5884 | ||
5885 | if (shdr.get_sh_type() == elfcpp::SHT_MIPS_REGINFO) | |
5886 | { | |
5887 | // Read the gp value that was used to create this object. We need the | |
5888 | // gp value while processing relocs. The .reginfo section is not used | |
5889 | // in the 64-bit MIPS ELF ABI. | |
5890 | section_offset_type section_offset = shdr.get_sh_offset(); | |
5891 | section_size_type section_size = | |
5892 | convert_to_section_size_type(shdr.get_sh_size()); | |
5893 | const unsigned char* view = | |
5894 | this->get_view(section_offset, section_size, true, false); | |
5895 | ||
5896 | this->gp_ = elfcpp::Swap<size, big_endian>::readval(view + 20); | |
5897 | ||
5898 | // Read the rest of .reginfo. | |
5899 | this->gprmask_ = elfcpp::Swap<size, big_endian>::readval(view); | |
5900 | this->cprmask1_ = elfcpp::Swap<size, big_endian>::readval(view + 4); | |
5901 | this->cprmask2_ = elfcpp::Swap<size, big_endian>::readval(view + 8); | |
5902 | this->cprmask3_ = elfcpp::Swap<size, big_endian>::readval(view + 12); | |
5903 | this->cprmask4_ = elfcpp::Swap<size, big_endian>::readval(view + 16); | |
5904 | } | |
5905 | ||
5906 | const char* name = pnames + shdr.get_sh_name(); | |
5907 | this->section_is_mips16_fn_stub_[i] = is_prefix_of(".mips16.fn", name); | |
5908 | this->section_is_mips16_call_stub_[i] = | |
5909 | is_prefix_of(".mips16.call.", name); | |
5910 | this->section_is_mips16_call_fp_stub_[i] = | |
5911 | is_prefix_of(".mips16.call.fp.", name); | |
5912 | ||
5913 | if (strcmp(name, ".pdr") == 0) | |
5914 | { | |
5915 | gold_assert(this->pdr_shndx_ == -1U); | |
5916 | this->pdr_shndx_ = i; | |
5917 | } | |
5918 | } | |
5919 | } | |
5920 | ||
5921 | // Discard MIPS16 stub secions that are not needed. | |
5922 | ||
5923 | template<int size, bool big_endian> | |
5924 | void | |
5925 | Mips_relobj<size, big_endian>::discard_mips16_stub_sections(Symbol_table* symtab) | |
5926 | { | |
5927 | for (typename Mips16_stubs_int_map::const_iterator | |
5928 | it = this->mips16_stub_sections_.begin(); | |
5929 | it != this->mips16_stub_sections_.end(); ++it) | |
5930 | { | |
5931 | Mips16_stub_section<size, big_endian>* stub_section = it->second; | |
5932 | if (!stub_section->is_target_found()) | |
5933 | { | |
5934 | gold_error(_("no relocation found in mips16 stub section '%s'"), | |
5935 | stub_section->object() | |
5936 | ->section_name(stub_section->shndx()).c_str()); | |
5937 | } | |
5938 | ||
5939 | bool discard = false; | |
5940 | if (stub_section->is_for_local_function()) | |
5941 | { | |
5942 | if (stub_section->is_fn_stub()) | |
5943 | { | |
5944 | // This stub is for a local symbol. This stub will only | |
5945 | // be needed if there is some relocation in this object, | |
5946 | // other than a 16 bit function call, which refers to this | |
5947 | // symbol. | |
5948 | if (!this->has_local_non_16bit_call_relocs(stub_section->r_sym())) | |
5949 | discard = true; | |
5950 | else | |
5951 | this->add_local_mips16_fn_stub(stub_section); | |
5952 | } | |
5953 | else | |
5954 | { | |
5955 | // This stub is for a local symbol. This stub will only | |
5956 | // be needed if there is some relocation (R_MIPS16_26) in | |
5957 | // this object that refers to this symbol. | |
5958 | gold_assert(stub_section->is_call_stub() | |
5959 | || stub_section->is_call_fp_stub()); | |
5960 | if (!this->has_local_16bit_call_relocs(stub_section->r_sym())) | |
5961 | discard = true; | |
5962 | else | |
5963 | this->add_local_mips16_call_stub(stub_section); | |
5964 | } | |
5965 | } | |
5966 | else | |
5967 | { | |
5968 | Mips_symbol<size>* gsym = stub_section->gsym(); | |
5969 | if (stub_section->is_fn_stub()) | |
5970 | { | |
5971 | if (gsym->has_mips16_fn_stub()) | |
5972 | // We already have a stub for this function. | |
5973 | discard = true; | |
5974 | else | |
5975 | { | |
5976 | gsym->set_mips16_fn_stub(stub_section); | |
5977 | if (gsym->should_add_dynsym_entry(symtab)) | |
5978 | { | |
5979 | // If we have a MIPS16 function with a stub, the | |
5980 | // dynamic symbol must refer to the stub, since only | |
5981 | // the stub uses the standard calling conventions. | |
5982 | gsym->set_need_fn_stub(); | |
5983 | if (gsym->is_from_dynobj()) | |
5984 | gsym->set_needs_dynsym_value(); | |
5985 | } | |
5986 | } | |
5987 | if (!gsym->need_fn_stub()) | |
5988 | discard = true; | |
5989 | } | |
5990 | else if (stub_section->is_call_stub()) | |
5991 | { | |
5992 | if (gsym->is_mips16()) | |
5993 | // We don't need the call_stub; this is a 16 bit | |
5994 | // function, so calls from other 16 bit functions are | |
5995 | // OK. | |
5996 | discard = true; | |
5997 | else if (gsym->has_mips16_call_stub()) | |
5998 | // We already have a stub for this function. | |
5999 | discard = true; | |
6000 | else | |
6001 | gsym->set_mips16_call_stub(stub_section); | |
6002 | } | |
6003 | else | |
6004 | { | |
6005 | gold_assert(stub_section->is_call_fp_stub()); | |
6006 | if (gsym->is_mips16()) | |
6007 | // We don't need the call_stub; this is a 16 bit | |
6008 | // function, so calls from other 16 bit functions are | |
6009 | // OK. | |
6010 | discard = true; | |
6011 | else if (gsym->has_mips16_call_fp_stub()) | |
6012 | // We already have a stub for this function. | |
6013 | discard = true; | |
6014 | else | |
6015 | gsym->set_mips16_call_fp_stub(stub_section); | |
6016 | } | |
6017 | } | |
6018 | if (discard) | |
6019 | this->set_output_section(stub_section->shndx(), NULL); | |
6020 | } | |
6021 | } | |
6022 | ||
6023 | // Mips_output_data_la25_stub methods. | |
6024 | ||
6025 | // Template for standard LA25 stub. | |
6026 | template<int size, bool big_endian> | |
6027 | const uint32_t | |
6028 | Mips_output_data_la25_stub<size, big_endian>::la25_stub_entry[] = | |
6029 | { | |
6030 | 0x3c190000, // lui $25,%hi(func) | |
6031 | 0x08000000, // j func | |
6032 | 0x27390000, // add $25,$25,%lo(func) | |
6033 | 0x00000000 // nop | |
6034 | }; | |
6035 | ||
6036 | // Template for microMIPS LA25 stub. | |
6037 | template<int size, bool big_endian> | |
6038 | const uint32_t | |
6039 | Mips_output_data_la25_stub<size, big_endian>::la25_stub_micromips_entry[] = | |
6040 | { | |
6041 | 0x41b9, 0x0000, // lui t9,%hi(func) | |
6042 | 0xd400, 0x0000, // j func | |
6043 | 0x3339, 0x0000, // addiu t9,t9,%lo(func) | |
6044 | 0x0000, 0x0000 // nop | |
6045 | }; | |
6046 | ||
6047 | // Create la25 stub for a symbol. | |
6048 | ||
6049 | template<int size, bool big_endian> | |
6050 | void | |
6051 | Mips_output_data_la25_stub<size, big_endian>::create_la25_stub( | |
6052 | Symbol_table* symtab, Target_mips<size, big_endian>* target, | |
6053 | Mips_symbol<size>* gsym) | |
6054 | { | |
6055 | if (!gsym->has_la25_stub()) | |
6056 | { | |
6057 | gsym->set_la25_stub_offset(this->symbols_.size() * 16); | |
6058 | this->symbols_.insert(gsym); | |
6059 | this->create_stub_symbol(gsym, symtab, target, 16); | |
6060 | } | |
6061 | } | |
6062 | ||
6063 | // Create a symbol for SYM stub's value and size, to help make the disassembly | |
6064 | // easier to read. | |
6065 | ||
6066 | template<int size, bool big_endian> | |
6067 | void | |
6068 | Mips_output_data_la25_stub<size, big_endian>::create_stub_symbol( | |
6069 | Mips_symbol<size>* sym, Symbol_table* symtab, | |
6070 | Target_mips<size, big_endian>* target, uint64_t symsize) | |
6071 | { | |
6072 | std::string name(".pic."); | |
6073 | name += sym->name(); | |
6074 | ||
6075 | unsigned int offset = sym->la25_stub_offset(); | |
6076 | if (sym->is_micromips()) | |
6077 | offset |= 1; | |
6078 | ||
6079 | // Make it a local function. | |
6080 | Symbol* new_sym = symtab->define_in_output_data(name.c_str(), NULL, | |
6081 | Symbol_table::PREDEFINED, | |
6082 | target->la25_stub_section(), | |
6083 | offset, symsize, elfcpp::STT_FUNC, | |
6084 | elfcpp::STB_LOCAL, | |
6085 | elfcpp::STV_DEFAULT, 0, | |
6086 | false, false); | |
6087 | new_sym->set_is_forced_local(); | |
6088 | } | |
6089 | ||
6090 | // Write out la25 stubs. This uses the hand-coded instructions above, | |
6091 | // and adjusts them as needed. | |
6092 | ||
6093 | template<int size, bool big_endian> | |
6094 | void | |
6095 | Mips_output_data_la25_stub<size, big_endian>::do_write(Output_file* of) | |
6096 | { | |
6097 | const off_t offset = this->offset(); | |
6098 | const section_size_type oview_size = | |
6099 | convert_to_section_size_type(this->data_size()); | |
6100 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
6101 | ||
6102 | for (typename Unordered_set<Mips_symbol<size>*>::iterator | |
6103 | p = this->symbols_.begin(); | |
6104 | p != this->symbols_.end(); | |
6105 | ++p) | |
6106 | { | |
6107 | Mips_symbol<size>* sym = *p; | |
6108 | unsigned char* pov = oview + sym->la25_stub_offset(); | |
6109 | ||
6110 | Mips_address target = sym->value(); | |
6111 | if (!sym->is_micromips()) | |
6112 | { | |
6113 | elfcpp::Swap<32, big_endian>::writeval(pov, | |
6114 | la25_stub_entry[0] | (((target + 0x8000) >> 16) & 0xffff)); | |
6115 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, | |
6116 | la25_stub_entry[1] | ((target >> 2) & 0x3ffffff)); | |
6117 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, | |
6118 | la25_stub_entry[2] | (target & 0xffff)); | |
6119 | elfcpp::Swap<32, big_endian>::writeval(pov + 12, la25_stub_entry[3]); | |
6120 | } | |
6121 | else | |
6122 | { | |
6123 | target |= 1; | |
6124 | // First stub instruction. Paste high 16-bits of the target. | |
6125 | elfcpp::Swap<16, big_endian>::writeval(pov, | |
6126 | la25_stub_micromips_entry[0]); | |
6127 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, | |
6128 | ((target + 0x8000) >> 16) & 0xffff); | |
6129 | // Second stub instruction. Paste low 26-bits of the target, shifted | |
6130 | // right by 1. | |
6131 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, | |
6132 | la25_stub_micromips_entry[2] | ((target >> 17) & 0x3ff)); | |
6133 | elfcpp::Swap<16, big_endian>::writeval(pov + 6, | |
6134 | la25_stub_micromips_entry[3] | ((target >> 1) & 0xffff)); | |
6135 | // Third stub instruction. Paste low 16-bits of the target. | |
6136 | elfcpp::Swap<16, big_endian>::writeval(pov + 8, | |
6137 | la25_stub_micromips_entry[4]); | |
6138 | elfcpp::Swap<16, big_endian>::writeval(pov + 10, target & 0xffff); | |
6139 | // Fourth stub instruction. | |
6140 | elfcpp::Swap<16, big_endian>::writeval(pov + 12, | |
6141 | la25_stub_micromips_entry[6]); | |
6142 | elfcpp::Swap<16, big_endian>::writeval(pov + 14, | |
6143 | la25_stub_micromips_entry[7]); | |
6144 | } | |
6145 | } | |
6146 | ||
6147 | of->write_output_view(offset, oview_size, oview); | |
6148 | } | |
6149 | ||
6150 | // Mips_output_data_plt methods. | |
6151 | ||
6152 | // The format of the first PLT entry in an O32 executable. | |
6153 | template<int size, bool big_endian> | |
6154 | const uint32_t Mips_output_data_plt<size, big_endian>::plt0_entry_o32[] = | |
6155 | { | |
6156 | 0x3c1c0000, // lui $28, %hi(&GOTPLT[0]) | |
6157 | 0x8f990000, // lw $25, %lo(&GOTPLT[0])($28) | |
6158 | 0x279c0000, // addiu $28, $28, %lo(&GOTPLT[0]) | |
6159 | 0x031cc023, // subu $24, $24, $28 | |
6160 | 0x03e07821, // move $15, $31 # 32-bit move (addu) | |
6161 | 0x0018c082, // srl $24, $24, 2 | |
6162 | 0x0320f809, // jalr $25 | |
6163 | 0x2718fffe // subu $24, $24, 2 | |
6164 | }; | |
6165 | ||
6166 | // The format of the first PLT entry in an N32 executable. Different | |
6167 | // because gp ($28) is not available; we use t2 ($14) instead. | |
6168 | template<int size, bool big_endian> | |
6169 | const uint32_t Mips_output_data_plt<size, big_endian>::plt0_entry_n32[] = | |
6170 | { | |
6171 | 0x3c0e0000, // lui $14, %hi(&GOTPLT[0]) | |
6172 | 0x8dd90000, // lw $25, %lo(&GOTPLT[0])($14) | |
6173 | 0x25ce0000, // addiu $14, $14, %lo(&GOTPLT[0]) | |
6174 | 0x030ec023, // subu $24, $24, $14 | |
6175 | 0x03e07821, // move $15, $31 # 32-bit move (addu) | |
6176 | 0x0018c082, // srl $24, $24, 2 | |
6177 | 0x0320f809, // jalr $25 | |
6178 | 0x2718fffe // subu $24, $24, 2 | |
6179 | }; | |
6180 | ||
6181 | // The format of the first PLT entry in an N64 executable. Different | |
6182 | // from N32 because of the increased size of GOT entries. | |
6183 | template<int size, bool big_endian> | |
6184 | const uint32_t Mips_output_data_plt<size, big_endian>::plt0_entry_n64[] = | |
6185 | { | |
6186 | 0x3c0e0000, // lui $14, %hi(&GOTPLT[0]) | |
6187 | 0xddd90000, // ld $25, %lo(&GOTPLT[0])($14) | |
6188 | 0x25ce0000, // addiu $14, $14, %lo(&GOTPLT[0]) | |
6189 | 0x030ec023, // subu $24, $24, $14 | |
6190 | 0x03e07821, // move $15, $31 # 64-bit move (daddu) | |
6191 | 0x0018c0c2, // srl $24, $24, 3 | |
6192 | 0x0320f809, // jalr $25 | |
6193 | 0x2718fffe // subu $24, $24, 2 | |
6194 | }; | |
6195 | ||
6196 | // The format of the microMIPS first PLT entry in an O32 executable. | |
6197 | // We rely on v0 ($2) rather than t8 ($24) to contain the address | |
6198 | // of the GOTPLT entry handled, so this stub may only be used when | |
6199 | // all the subsequent PLT entries are microMIPS code too. | |
6200 | // | |
6201 | // The trailing NOP is for alignment and correct disassembly only. | |
6202 | template<int size, bool big_endian> | |
6203 | const uint32_t Mips_output_data_plt<size, big_endian>:: | |
6204 | plt0_entry_micromips_o32[] = | |
6205 | { | |
6206 | 0x7980, 0x0000, // addiupc $3, (&GOTPLT[0]) - . | |
6207 | 0xff23, 0x0000, // lw $25, 0($3) | |
6208 | 0x0535, // subu $2, $2, $3 | |
6209 | 0x2525, // srl $2, $2, 2 | |
6210 | 0x3302, 0xfffe, // subu $24, $2, 2 | |
6211 | 0x0dff, // move $15, $31 | |
6212 | 0x45f9, // jalrs $25 | |
6213 | 0x0f83, // move $28, $3 | |
6214 | 0x0c00 // nop | |
6215 | }; | |
6216 | ||
6217 | // The format of the microMIPS first PLT entry in an O32 executable | |
6218 | // in the insn32 mode. | |
6219 | template<int size, bool big_endian> | |
6220 | const uint32_t Mips_output_data_plt<size, big_endian>:: | |
6221 | plt0_entry_micromips32_o32[] = | |
6222 | { | |
6223 | 0x41bc, 0x0000, // lui $28, %hi(&GOTPLT[0]) | |
6224 | 0xff3c, 0x0000, // lw $25, %lo(&GOTPLT[0])($28) | |
6225 | 0x339c, 0x0000, // addiu $28, $28, %lo(&GOTPLT[0]) | |
6226 | 0x0398, 0xc1d0, // subu $24, $24, $28 | |
6227 | 0x001f, 0x7950, // move $15, $31 | |
6228 | 0x0318, 0x1040, // srl $24, $24, 2 | |
6229 | 0x03f9, 0x0f3c, // jalr $25 | |
6230 | 0x3318, 0xfffe // subu $24, $24, 2 | |
6231 | }; | |
6232 | ||
6233 | // The format of subsequent standard entries in the PLT. | |
6234 | template<int size, bool big_endian> | |
6235 | const uint32_t Mips_output_data_plt<size, big_endian>::plt_entry[] = | |
6236 | { | |
6237 | 0x3c0f0000, // lui $15, %hi(.got.plt entry) | |
6238 | 0x8df90000, // l[wd] $25, %lo(.got.plt entry)($15) | |
6239 | 0x03200008, // jr $25 | |
6240 | 0x25f80000 // addiu $24, $15, %lo(.got.plt entry) | |
6241 | }; | |
6242 | ||
6243 | // The format of subsequent MIPS16 o32 PLT entries. We use v1 ($3) as a | |
6244 | // temporary because t8 ($24) and t9 ($25) are not directly addressable. | |
6245 | // Note that this differs from the GNU ld which uses both v0 ($2) and v1 ($3). | |
6246 | // We cannot use v0 because MIPS16 call stubs from the CS toolchain expect | |
6247 | // target function address in register v0. | |
6248 | template<int size, bool big_endian> | |
6249 | const uint32_t Mips_output_data_plt<size, big_endian>::plt_entry_mips16_o32[] = | |
6250 | { | |
6251 | 0xb303, // lw $3, 12($pc) | |
6252 | 0x651b, // move $24, $3 | |
6253 | 0x9b60, // lw $3, 0($3) | |
6254 | 0xeb00, // jr $3 | |
6255 | 0x653b, // move $25, $3 | |
6256 | 0x6500, // nop | |
6257 | 0x0000, 0x0000 // .word (.got.plt entry) | |
6258 | }; | |
6259 | ||
6260 | // The format of subsequent microMIPS o32 PLT entries. We use v0 ($2) | |
6261 | // as a temporary because t8 ($24) is not addressable with ADDIUPC. | |
6262 | template<int size, bool big_endian> | |
6263 | const uint32_t Mips_output_data_plt<size, big_endian>:: | |
6264 | plt_entry_micromips_o32[] = | |
6265 | { | |
6266 | 0x7900, 0x0000, // addiupc $2, (.got.plt entry) - . | |
6267 | 0xff22, 0x0000, // lw $25, 0($2) | |
6268 | 0x4599, // jr $25 | |
6269 | 0x0f02 // move $24, $2 | |
6270 | }; | |
6271 | ||
6272 | // The format of subsequent microMIPS o32 PLT entries in the insn32 mode. | |
6273 | template<int size, bool big_endian> | |
6274 | const uint32_t Mips_output_data_plt<size, big_endian>:: | |
6275 | plt_entry_micromips32_o32[] = | |
6276 | { | |
6277 | 0x41af, 0x0000, // lui $15, %hi(.got.plt entry) | |
6278 | 0xff2f, 0x0000, // lw $25, %lo(.got.plt entry)($15) | |
6279 | 0x0019, 0x0f3c, // jr $25 | |
6280 | 0x330f, 0x0000 // addiu $24, $15, %lo(.got.plt entry) | |
6281 | }; | |
6282 | ||
6283 | // Add an entry to the PLT for a symbol referenced by r_type relocation. | |
6284 | ||
6285 | template<int size, bool big_endian> | |
6286 | void | |
6287 | Mips_output_data_plt<size, big_endian>::add_entry(Mips_symbol<size>* gsym, | |
6288 | unsigned int r_type) | |
6289 | { | |
6290 | gold_assert(!gsym->has_plt_offset()); | |
6291 | ||
6292 | // Final PLT offset for a symbol will be set in method set_plt_offsets(). | |
6293 | gsym->set_plt_offset(this->entry_count() * sizeof(plt_entry) | |
6294 | + sizeof(plt0_entry_o32)); | |
6295 | this->symbols_.push_back(gsym); | |
6296 | ||
6297 | // Record whether the relocation requires a standard MIPS | |
6298 | // or a compressed code entry. | |
6299 | if (jal_reloc(r_type)) | |
6300 | { | |
6301 | if (r_type == elfcpp::R_MIPS_26) | |
6302 | gsym->set_needs_mips_plt(true); | |
6303 | else | |
6304 | gsym->set_needs_comp_plt(true); | |
6305 | } | |
6306 | ||
6307 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
6308 | ||
6309 | // Every PLT entry needs a GOT entry which points back to the PLT | |
6310 | // entry (this will be changed by the dynamic linker, normally | |
6311 | // lazily when the function is called). | |
6312 | this->got_plt_->set_current_data_size(got_offset + size/8); | |
6313 | ||
6314 | gsym->set_needs_dynsym_entry(); | |
6315 | this->rel_->add_global(gsym, elfcpp::R_MIPS_JUMP_SLOT, this->got_plt_, | |
6316 | got_offset); | |
6317 | } | |
6318 | ||
6319 | // Set final PLT offsets. For each symbol, determine whether standard or | |
6320 | // compressed (MIPS16 or microMIPS) PLT entry is used. | |
6321 | ||
6322 | template<int size, bool big_endian> | |
6323 | void | |
6324 | Mips_output_data_plt<size, big_endian>::set_plt_offsets() | |
6325 | { | |
6326 | // The sizes of individual PLT entries. | |
6327 | unsigned int plt_mips_entry_size = this->standard_plt_entry_size(); | |
6328 | unsigned int plt_comp_entry_size = (!this->target_->is_output_newabi() | |
6329 | ? this->compressed_plt_entry_size() : 0); | |
6330 | ||
6331 | for (typename std::vector<Mips_symbol<size>*>::const_iterator | |
6332 | p = this->symbols_.begin(); p != this->symbols_.end(); ++p) | |
6333 | { | |
6334 | Mips_symbol<size>* mips_sym = *p; | |
6335 | ||
6336 | // There are no defined MIPS16 or microMIPS PLT entries for n32 or n64, | |
6337 | // so always use a standard entry there. | |
6338 | // | |
6339 | // If the symbol has a MIPS16 call stub and gets a PLT entry, then | |
6340 | // all MIPS16 calls will go via that stub, and there is no benefit | |
6341 | // to having a MIPS16 entry. And in the case of call_stub a | |
6342 | // standard entry actually has to be used as the stub ends with a J | |
6343 | // instruction. | |
6344 | if (this->target_->is_output_newabi() | |
6345 | || mips_sym->has_mips16_call_stub() | |
6346 | || mips_sym->has_mips16_call_fp_stub()) | |
6347 | { | |
6348 | mips_sym->set_needs_mips_plt(true); | |
6349 | mips_sym->set_needs_comp_plt(false); | |
6350 | } | |
6351 | ||
6352 | // Otherwise, if there are no direct calls to the function, we | |
6353 | // have a free choice of whether to use standard or compressed | |
6354 | // entries. Prefer microMIPS entries if the object is known to | |
6355 | // contain microMIPS code, so that it becomes possible to create | |
6356 | // pure microMIPS binaries. Prefer standard entries otherwise, | |
6357 | // because MIPS16 ones are no smaller and are usually slower. | |
6358 | if (!mips_sym->needs_mips_plt() && !mips_sym->needs_comp_plt()) | |
6359 | { | |
6360 | if (this->target_->is_output_micromips()) | |
6361 | mips_sym->set_needs_comp_plt(true); | |
6362 | else | |
6363 | mips_sym->set_needs_mips_plt(true); | |
6364 | } | |
6365 | ||
6366 | if (mips_sym->needs_mips_plt()) | |
6367 | { | |
6368 | mips_sym->set_mips_plt_offset(this->plt_mips_offset_); | |
6369 | this->plt_mips_offset_ += plt_mips_entry_size; | |
6370 | } | |
6371 | if (mips_sym->needs_comp_plt()) | |
6372 | { | |
6373 | mips_sym->set_comp_plt_offset(this->plt_comp_offset_); | |
6374 | this->plt_comp_offset_ += plt_comp_entry_size; | |
6375 | } | |
6376 | } | |
6377 | ||
6378 | // Figure out the size of the PLT header if we know that we are using it. | |
6379 | if (this->plt_mips_offset_ + this->plt_comp_offset_ != 0) | |
6380 | this->plt_header_size_ = this->get_plt_header_size(); | |
6381 | } | |
6382 | ||
6383 | // Write out the PLT. This uses the hand-coded instructions above, | |
6384 | // and adjusts them as needed. | |
6385 | ||
6386 | template<int size, bool big_endian> | |
6387 | void | |
6388 | Mips_output_data_plt<size, big_endian>::do_write(Output_file* of) | |
6389 | { | |
6390 | const off_t offset = this->offset(); | |
6391 | const section_size_type oview_size = | |
6392 | convert_to_section_size_type(this->data_size()); | |
6393 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
6394 | ||
6395 | const off_t gotplt_file_offset = this->got_plt_->offset(); | |
6396 | const section_size_type gotplt_size = | |
6397 | convert_to_section_size_type(this->got_plt_->data_size()); | |
6398 | unsigned char* const gotplt_view = of->get_output_view(gotplt_file_offset, | |
6399 | gotplt_size); | |
6400 | unsigned char* pov = oview; | |
6401 | ||
6402 | Mips_address plt_address = this->address(); | |
6403 | ||
6404 | // Calculate the address of .got.plt. | |
6405 | Mips_address gotplt_addr = this->got_plt_->address(); | |
6406 | Mips_address gotplt_addr_high = ((gotplt_addr + 0x8000) >> 16) & 0xffff; | |
6407 | Mips_address gotplt_addr_low = gotplt_addr & 0xffff; | |
6408 | ||
6409 | // The PLT sequence is not safe for N64 if .got.plt's address can | |
6410 | // not be loaded in two instructions. | |
6411 | gold_assert((gotplt_addr & ~(Mips_address) 0x7fffffff) == 0 | |
6412 | || ~(gotplt_addr | 0x7fffffff) == 0); | |
6413 | ||
6414 | // Write the PLT header. | |
6415 | const uint32_t* plt0_entry = this->get_plt_header_entry(); | |
6416 | if (plt0_entry == plt0_entry_micromips_o32) | |
6417 | { | |
6418 | // Write microMIPS PLT header. | |
6419 | gold_assert(gotplt_addr % 4 == 0); | |
6420 | ||
6421 | Mips_address gotpc_offset = gotplt_addr - ((plt_address | 3) ^ 3); | |
6422 | ||
6423 | // ADDIUPC has a span of +/-16MB, check we're in range. | |
6424 | if (gotpc_offset + 0x1000000 >= 0x2000000) | |
6425 | { | |
6426 | gold_error(_(".got.plt offset of %ld from .plt beyond the range of " | |
6427 | "ADDIUPC"), (long)gotpc_offset); | |
6428 | return; | |
6429 | } | |
6430 | ||
6431 | elfcpp::Swap<16, big_endian>::writeval(pov, | |
6432 | plt0_entry[0] | ((gotpc_offset >> 18) & 0x7f)); | |
6433 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, | |
6434 | (gotpc_offset >> 2) & 0xffff); | |
6435 | pov += 4; | |
6436 | for (unsigned int i = 2; | |
6437 | i < (sizeof(plt0_entry_micromips_o32) | |
6438 | / sizeof(plt0_entry_micromips_o32[0])); | |
6439 | i++) | |
6440 | { | |
6441 | elfcpp::Swap<16, big_endian>::writeval(pov, plt0_entry[i]); | |
6442 | pov += 2; | |
6443 | } | |
6444 | } | |
6445 | else if (plt0_entry == plt0_entry_micromips32_o32) | |
6446 | { | |
6447 | // Write microMIPS PLT header in insn32 mode. | |
6448 | elfcpp::Swap<16, big_endian>::writeval(pov, plt0_entry[0]); | |
6449 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, gotplt_addr_high); | |
6450 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, plt0_entry[2]); | |
6451 | elfcpp::Swap<16, big_endian>::writeval(pov + 6, gotplt_addr_low); | |
6452 | elfcpp::Swap<16, big_endian>::writeval(pov + 8, plt0_entry[4]); | |
6453 | elfcpp::Swap<16, big_endian>::writeval(pov + 10, gotplt_addr_low); | |
6454 | pov += 12; | |
6455 | for (unsigned int i = 6; | |
6456 | i < (sizeof(plt0_entry_micromips32_o32) | |
6457 | / sizeof(plt0_entry_micromips32_o32[0])); | |
6458 | i++) | |
6459 | { | |
6460 | elfcpp::Swap<16, big_endian>::writeval(pov, plt0_entry[i]); | |
6461 | pov += 2; | |
6462 | } | |
6463 | } | |
6464 | else | |
6465 | { | |
6466 | // Write standard PLT header. | |
6467 | elfcpp::Swap<32, big_endian>::writeval(pov, | |
6468 | plt0_entry[0] | gotplt_addr_high); | |
6469 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, | |
6470 | plt0_entry[1] | gotplt_addr_low); | |
6471 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, | |
6472 | plt0_entry[2] | gotplt_addr_low); | |
6473 | pov += 12; | |
6474 | for (int i = 3; i < 8; i++) | |
6475 | { | |
6476 | elfcpp::Swap<32, big_endian>::writeval(pov, plt0_entry[i]); | |
6477 | pov += 4; | |
6478 | } | |
6479 | } | |
6480 | ||
6481 | ||
6482 | unsigned char* gotplt_pov = gotplt_view; | |
6483 | unsigned int got_entry_size = size/8; // TODO(sasa): MIPS_ELF_GOT_SIZE | |
6484 | ||
6485 | // The first two entries in .got.plt are reserved. | |
6486 | elfcpp::Swap<size, big_endian>::writeval(gotplt_pov, 0); | |
6487 | elfcpp::Swap<size, big_endian>::writeval(gotplt_pov + got_entry_size, 0); | |
6488 | ||
6489 | unsigned int gotplt_offset = 2 * got_entry_size; | |
6490 | gotplt_pov += 2 * got_entry_size; | |
6491 | ||
6492 | // Calculate the address of the PLT header. | |
6493 | Mips_address header_address = (plt_address | |
6494 | + (this->is_plt_header_compressed() ? 1 : 0)); | |
6495 | ||
6496 | // Initialize compressed PLT area view. | |
6497 | unsigned char* pov2 = pov + this->plt_mips_offset_; | |
6498 | ||
6499 | // Write the PLT entries. | |
6500 | for (typename std::vector<Mips_symbol<size>*>::const_iterator | |
6501 | p = this->symbols_.begin(); | |
6502 | p != this->symbols_.end(); | |
6503 | ++p, gotplt_pov += got_entry_size, gotplt_offset += got_entry_size) | |
6504 | { | |
6505 | Mips_symbol<size>* mips_sym = *p; | |
6506 | ||
6507 | // Calculate the address of the .got.plt entry. | |
6508 | uint32_t gotplt_entry_addr = (gotplt_addr + gotplt_offset); | |
6509 | uint32_t gotplt_entry_addr_hi = (((gotplt_entry_addr + 0x8000) >> 16) | |
6510 | & 0xffff); | |
6511 | uint32_t gotplt_entry_addr_lo = gotplt_entry_addr & 0xffff; | |
6512 | ||
6513 | // Initially point the .got.plt entry at the PLT header. | |
6514 | if (this->target_->is_output_n64()) | |
6515 | elfcpp::Swap<64, big_endian>::writeval(gotplt_pov, header_address); | |
6516 | else | |
6517 | elfcpp::Swap<32, big_endian>::writeval(gotplt_pov, header_address); | |
6518 | ||
6519 | // Now handle the PLT itself. First the standard entry. | |
6520 | if (mips_sym->has_mips_plt_offset()) | |
6521 | { | |
6522 | // Pick the load opcode (LW or LD). | |
6523 | uint64_t load = this->target_->is_output_n64() ? 0xdc000000 | |
6524 | : 0x8c000000; | |
6525 | ||
6526 | // Fill in the PLT entry itself. | |
6527 | elfcpp::Swap<32, big_endian>::writeval(pov, | |
6528 | plt_entry[0] | gotplt_entry_addr_hi); | |
6529 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, | |
6530 | plt_entry[1] | gotplt_entry_addr_lo | load); | |
6531 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, plt_entry[2]); | |
6532 | elfcpp::Swap<32, big_endian>::writeval(pov + 12, | |
6533 | plt_entry[3] | gotplt_entry_addr_lo); | |
6534 | pov += 16; | |
6535 | } | |
6536 | ||
6537 | // Now the compressed entry. They come after any standard ones. | |
6538 | if (mips_sym->has_comp_plt_offset()) | |
6539 | { | |
6540 | if (!this->target_->is_output_micromips()) | |
6541 | { | |
6542 | // Write MIPS16 PLT entry. | |
6543 | const uint32_t* plt_entry = plt_entry_mips16_o32; | |
6544 | ||
6545 | elfcpp::Swap<16, big_endian>::writeval(pov2, plt_entry[0]); | |
6546 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 2, plt_entry[1]); | |
6547 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 4, plt_entry[2]); | |
6548 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 6, plt_entry[3]); | |
6549 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 8, plt_entry[4]); | |
6550 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 10, plt_entry[5]); | |
6551 | elfcpp::Swap<32, big_endian>::writeval(pov2 + 12, | |
6552 | gotplt_entry_addr); | |
6553 | pov2 += 16; | |
6554 | } | |
6555 | else if (this->target_->use_32bit_micromips_instructions()) | |
6556 | { | |
6557 | // Write microMIPS PLT entry in insn32 mode. | |
6558 | const uint32_t* plt_entry = plt_entry_micromips32_o32; | |
6559 | ||
6560 | elfcpp::Swap<16, big_endian>::writeval(pov2, plt_entry[0]); | |
6561 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 2, | |
6562 | gotplt_entry_addr_hi); | |
6563 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 4, plt_entry[2]); | |
6564 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 6, | |
6565 | gotplt_entry_addr_lo); | |
6566 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 8, plt_entry[4]); | |
6567 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 10, plt_entry[5]); | |
6568 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 12, plt_entry[6]); | |
6569 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 14, | |
6570 | gotplt_entry_addr_lo); | |
6571 | pov2 += 16; | |
6572 | } | |
6573 | else | |
6574 | { | |
6575 | // Write microMIPS PLT entry. | |
6576 | const uint32_t* plt_entry = plt_entry_micromips_o32; | |
6577 | ||
6578 | gold_assert(gotplt_entry_addr % 4 == 0); | |
6579 | ||
6580 | Mips_address loc_address = plt_address + pov2 - oview; | |
6581 | int gotpc_offset = gotplt_entry_addr - ((loc_address | 3) ^ 3); | |
6582 | ||
6583 | // ADDIUPC has a span of +/-16MB, check we're in range. | |
6584 | if (gotpc_offset + 0x1000000 >= 0x2000000) | |
6585 | { | |
6586 | gold_error(_(".got.plt offset of %ld from .plt beyond the " | |
6587 | "range of ADDIUPC"), (long)gotpc_offset); | |
6588 | return; | |
6589 | } | |
6590 | ||
6591 | elfcpp::Swap<16, big_endian>::writeval(pov2, | |
6592 | plt_entry[0] | ((gotpc_offset >> 18) & 0x7f)); | |
6593 | elfcpp::Swap<16, big_endian>::writeval( | |
6594 | pov2 + 2, (gotpc_offset >> 2) & 0xffff); | |
6595 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 4, plt_entry[2]); | |
6596 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 6, plt_entry[3]); | |
6597 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 8, plt_entry[4]); | |
6598 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 10, plt_entry[5]); | |
6599 | pov2 += 12; | |
6600 | } | |
6601 | } | |
6602 | } | |
6603 | ||
6604 | // Check the number of bytes written for standard entries. | |
6605 | gold_assert(static_cast<section_size_type>( | |
6606 | pov - oview - this->plt_header_size_) == this->plt_mips_offset_); | |
6607 | // Check the number of bytes written for compressed entries. | |
6608 | gold_assert((static_cast<section_size_type>(pov2 - pov) | |
6609 | == this->plt_comp_offset_)); | |
6610 | // Check the total number of bytes written. | |
6611 | gold_assert(static_cast<section_size_type>(pov2 - oview) == oview_size); | |
6612 | ||
6613 | gold_assert(static_cast<section_size_type>(gotplt_pov - gotplt_view) | |
6614 | == gotplt_size); | |
6615 | ||
6616 | of->write_output_view(offset, oview_size, oview); | |
6617 | of->write_output_view(gotplt_file_offset, gotplt_size, gotplt_view); | |
6618 | } | |
6619 | ||
6620 | // Mips_output_data_mips_stubs methods. | |
6621 | ||
6622 | // The format of the lazy binding stub when dynamic symbol count is less than | |
6623 | // 64K, dynamic symbol index is less than 32K, and ABI is not N64. | |
6624 | template<int size, bool big_endian> | |
6625 | const uint32_t | |
6626 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_normal_1[4] = | |
6627 | { | |
6628 | 0x8f998010, // lw t9,0x8010(gp) | |
6629 | 0x03e07821, // addu t7,ra,zero | |
6630 | 0x0320f809, // jalr t9,ra | |
6631 | 0x24180000 // addiu t8,zero,DYN_INDEX sign extended | |
6632 | }; | |
6633 | ||
6634 | // The format of the lazy binding stub when dynamic symbol count is less than | |
6635 | // 64K, dynamic symbol index is less than 32K, and ABI is N64. | |
6636 | template<int size, bool big_endian> | |
6637 | const uint32_t | |
6638 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_normal_1_n64[4] = | |
6639 | { | |
6640 | 0xdf998010, // ld t9,0x8010(gp) | |
6641 | 0x03e0782d, // daddu t7,ra,zero | |
6642 | 0x0320f809, // jalr t9,ra | |
6643 | 0x64180000 // daddiu t8,zero,DYN_INDEX sign extended | |
6644 | }; | |
6645 | ||
6646 | // The format of the lazy binding stub when dynamic symbol count is less than | |
6647 | // 64K, dynamic symbol index is between 32K and 64K, and ABI is not N64. | |
6648 | template<int size, bool big_endian> | |
6649 | const uint32_t | |
6650 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_normal_2[4] = | |
6651 | { | |
6652 | 0x8f998010, // lw t9,0x8010(gp) | |
6653 | 0x03e07821, // addu t7,ra,zero | |
6654 | 0x0320f809, // jalr t9,ra | |
6655 | 0x34180000 // ori t8,zero,DYN_INDEX unsigned | |
6656 | }; | |
6657 | ||
6658 | // The format of the lazy binding stub when dynamic symbol count is less than | |
6659 | // 64K, dynamic symbol index is between 32K and 64K, and ABI is N64. | |
6660 | template<int size, bool big_endian> | |
6661 | const uint32_t | |
6662 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_normal_2_n64[4] = | |
6663 | { | |
6664 | 0xdf998010, // ld t9,0x8010(gp) | |
6665 | 0x03e0782d, // daddu t7,ra,zero | |
6666 | 0x0320f809, // jalr t9,ra | |
6667 | 0x34180000 // ori t8,zero,DYN_INDEX unsigned | |
6668 | }; | |
6669 | ||
6670 | // The format of the lazy binding stub when dynamic symbol count is greater than | |
6671 | // 64K, and ABI is not N64. | |
6672 | template<int size, bool big_endian> | |
6673 | const uint32_t Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_big[5] = | |
6674 | { | |
6675 | 0x8f998010, // lw t9,0x8010(gp) | |
6676 | 0x03e07821, // addu t7,ra,zero | |
6677 | 0x3c180000, // lui t8,DYN_INDEX | |
6678 | 0x0320f809, // jalr t9,ra | |
6679 | 0x37180000 // ori t8,t8,DYN_INDEX | |
6680 | }; | |
6681 | ||
6682 | // The format of the lazy binding stub when dynamic symbol count is greater than | |
6683 | // 64K, and ABI is N64. | |
6684 | template<int size, bool big_endian> | |
6685 | const uint32_t | |
6686 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_big_n64[5] = | |
6687 | { | |
6688 | 0xdf998010, // ld t9,0x8010(gp) | |
6689 | 0x03e0782d, // daddu t7,ra,zero | |
6690 | 0x3c180000, // lui t8,DYN_INDEX | |
6691 | 0x0320f809, // jalr t9,ra | |
6692 | 0x37180000 // ori t8,t8,DYN_INDEX | |
6693 | }; | |
6694 | ||
6695 | // microMIPS stubs. | |
6696 | ||
6697 | // The format of the microMIPS lazy binding stub when dynamic symbol count is | |
6698 | // less than 64K, dynamic symbol index is less than 32K, and ABI is not N64. | |
6699 | template<int size, bool big_endian> | |
6700 | const uint32_t | |
6701 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips_normal_1[] = | |
6702 | { | |
6703 | 0xff3c, 0x8010, // lw t9,0x8010(gp) | |
6704 | 0x0dff, // move t7,ra | |
6705 | 0x45d9, // jalr t9 | |
6706 | 0x3300, 0x0000 // addiu t8,zero,DYN_INDEX sign extended | |
6707 | }; | |
6708 | ||
6709 | // The format of the microMIPS lazy binding stub when dynamic symbol count is | |
6710 | // less than 64K, dynamic symbol index is less than 32K, and ABI is N64. | |
6711 | template<int size, bool big_endian> | |
6712 | const uint32_t | |
6713 | Mips_output_data_mips_stubs<size, big_endian>:: | |
6714 | lazy_stub_micromips_normal_1_n64[] = | |
6715 | { | |
6716 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) | |
6717 | 0x0dff, // move t7,ra | |
6718 | 0x45d9, // jalr t9 | |
6719 | 0x5f00, 0x0000 // daddiu t8,zero,DYN_INDEX sign extended | |
6720 | }; | |
6721 | ||
6722 | // The format of the microMIPS lazy binding stub when dynamic symbol | |
6723 | // count is less than 64K, dynamic symbol index is between 32K and 64K, | |
6724 | // and ABI is not N64. | |
6725 | template<int size, bool big_endian> | |
6726 | const uint32_t | |
6727 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips_normal_2[] = | |
6728 | { | |
6729 | 0xff3c, 0x8010, // lw t9,0x8010(gp) | |
6730 | 0x0dff, // move t7,ra | |
6731 | 0x45d9, // jalr t9 | |
6732 | 0x5300, 0x0000 // ori t8,zero,DYN_INDEX unsigned | |
6733 | }; | |
6734 | ||
6735 | // The format of the microMIPS lazy binding stub when dynamic symbol | |
6736 | // count is less than 64K, dynamic symbol index is between 32K and 64K, | |
6737 | // and ABI is N64. | |
6738 | template<int size, bool big_endian> | |
6739 | const uint32_t | |
6740 | Mips_output_data_mips_stubs<size, big_endian>:: | |
6741 | lazy_stub_micromips_normal_2_n64[] = | |
6742 | { | |
6743 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) | |
6744 | 0x0dff, // move t7,ra | |
6745 | 0x45d9, // jalr t9 | |
6746 | 0x5300, 0x0000 // ori t8,zero,DYN_INDEX unsigned | |
6747 | }; | |
6748 | ||
6749 | // The format of the microMIPS lazy binding stub when dynamic symbol count is | |
6750 | // greater than 64K, and ABI is not N64. | |
6751 | template<int size, bool big_endian> | |
6752 | const uint32_t | |
6753 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips_big[] = | |
6754 | { | |
6755 | 0xff3c, 0x8010, // lw t9,0x8010(gp) | |
6756 | 0x0dff, // move t7,ra | |
6757 | 0x41b8, 0x0000, // lui t8,DYN_INDEX | |
6758 | 0x45d9, // jalr t9 | |
6759 | 0x5318, 0x0000 // ori t8,t8,DYN_INDEX | |
6760 | }; | |
6761 | ||
6762 | // The format of the microMIPS lazy binding stub when dynamic symbol count is | |
6763 | // greater than 64K, and ABI is N64. | |
6764 | template<int size, bool big_endian> | |
6765 | const uint32_t | |
6766 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips_big_n64[] = | |
6767 | { | |
6768 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) | |
6769 | 0x0dff, // move t7,ra | |
6770 | 0x41b8, 0x0000, // lui t8,DYN_INDEX | |
6771 | 0x45d9, // jalr t9 | |
6772 | 0x5318, 0x0000 // ori t8,t8,DYN_INDEX | |
6773 | }; | |
6774 | ||
6775 | // 32-bit microMIPS stubs. | |
6776 | ||
6777 | // The format of the microMIPS lazy binding stub when dynamic symbol count is | |
6778 | // less than 64K, dynamic symbol index is less than 32K, ABI is not N64, and we | |
6779 | // can use only 32-bit instructions. | |
6780 | template<int size, bool big_endian> | |
6781 | const uint32_t | |
6782 | Mips_output_data_mips_stubs<size, big_endian>:: | |
6783 | lazy_stub_micromips32_normal_1[] = | |
6784 | { | |
6785 | 0xff3c, 0x8010, // lw t9,0x8010(gp) | |
6786 | 0x001f, 0x7950, // addu t7,ra,zero | |
6787 | 0x03f9, 0x0f3c, // jalr ra,t9 | |
6788 | 0x3300, 0x0000 // addiu t8,zero,DYN_INDEX sign extended | |
6789 | }; | |
6790 | ||
6791 | // The format of the microMIPS lazy binding stub when dynamic symbol count is | |
6792 | // less than 64K, dynamic symbol index is less than 32K, ABI is N64, and we can | |
6793 | // use only 32-bit instructions. | |
6794 | template<int size, bool big_endian> | |
6795 | const uint32_t | |
6796 | Mips_output_data_mips_stubs<size, big_endian>:: | |
6797 | lazy_stub_micromips32_normal_1_n64[] = | |
6798 | { | |
6799 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) | |
6800 | 0x581f, 0x7950, // daddu t7,ra,zero | |
6801 | 0x03f9, 0x0f3c, // jalr ra,t9 | |
6802 | 0x5f00, 0x0000 // daddiu t8,zero,DYN_INDEX sign extended | |
6803 | }; | |
6804 | ||
6805 | // The format of the microMIPS lazy binding stub when dynamic symbol | |
6806 | // count is less than 64K, dynamic symbol index is between 32K and 64K, | |
6807 | // ABI is not N64, and we can use only 32-bit instructions. | |
6808 | template<int size, bool big_endian> | |
6809 | const uint32_t | |
6810 | Mips_output_data_mips_stubs<size, big_endian>:: | |
6811 | lazy_stub_micromips32_normal_2[] = | |
6812 | { | |
6813 | 0xff3c, 0x8010, // lw t9,0x8010(gp) | |
6814 | 0x001f, 0x7950, // addu t7,ra,zero | |
6815 | 0x03f9, 0x0f3c, // jalr ra,t9 | |
6816 | 0x5300, 0x0000 // ori t8,zero,DYN_INDEX unsigned | |
6817 | }; | |
6818 | ||
6819 | // The format of the microMIPS lazy binding stub when dynamic symbol | |
6820 | // count is less than 64K, dynamic symbol index is between 32K and 64K, | |
6821 | // ABI is N64, and we can use only 32-bit instructions. | |
6822 | template<int size, bool big_endian> | |
6823 | const uint32_t | |
6824 | Mips_output_data_mips_stubs<size, big_endian>:: | |
6825 | lazy_stub_micromips32_normal_2_n64[] = | |
6826 | { | |
6827 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) | |
6828 | 0x581f, 0x7950, // daddu t7,ra,zero | |
6829 | 0x03f9, 0x0f3c, // jalr ra,t9 | |
6830 | 0x5300, 0x0000 // ori t8,zero,DYN_INDEX unsigned | |
6831 | }; | |
6832 | ||
6833 | // The format of the microMIPS lazy binding stub when dynamic symbol count is | |
6834 | // greater than 64K, ABI is not N64, and we can use only 32-bit instructions. | |
6835 | template<int size, bool big_endian> | |
6836 | const uint32_t | |
6837 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips32_big[] = | |
6838 | { | |
6839 | 0xff3c, 0x8010, // lw t9,0x8010(gp) | |
6840 | 0x001f, 0x7950, // addu t7,ra,zero | |
6841 | 0x41b8, 0x0000, // lui t8,DYN_INDEX | |
6842 | 0x03f9, 0x0f3c, // jalr ra,t9 | |
6843 | 0x5318, 0x0000 // ori t8,t8,DYN_INDEX | |
6844 | }; | |
6845 | ||
6846 | // The format of the microMIPS lazy binding stub when dynamic symbol count is | |
6847 | // greater than 64K, ABI is N64, and we can use only 32-bit instructions. | |
6848 | template<int size, bool big_endian> | |
6849 | const uint32_t | |
6850 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips32_big_n64[] = | |
6851 | { | |
6852 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) | |
6853 | 0x581f, 0x7950, // daddu t7,ra,zero | |
6854 | 0x41b8, 0x0000, // lui t8,DYN_INDEX | |
6855 | 0x03f9, 0x0f3c, // jalr ra,t9 | |
6856 | 0x5318, 0x0000 // ori t8,t8,DYN_INDEX | |
6857 | }; | |
6858 | ||
6859 | // Create entry for a symbol. | |
6860 | ||
6861 | template<int size, bool big_endian> | |
6862 | void | |
6863 | Mips_output_data_mips_stubs<size, big_endian>::make_entry( | |
6864 | Mips_symbol<size>* gsym) | |
6865 | { | |
6866 | if (!gsym->has_lazy_stub() && !gsym->has_plt_offset()) | |
6867 | { | |
6868 | this->symbols_.insert(gsym); | |
6869 | gsym->set_has_lazy_stub(true); | |
6870 | } | |
6871 | } | |
6872 | ||
6873 | // Remove entry for a symbol. | |
6874 | ||
6875 | template<int size, bool big_endian> | |
6876 | void | |
6877 | Mips_output_data_mips_stubs<size, big_endian>::remove_entry( | |
6878 | Mips_symbol<size>* gsym) | |
6879 | { | |
6880 | if (gsym->has_lazy_stub()) | |
6881 | { | |
6882 | this->symbols_.erase(gsym); | |
6883 | gsym->set_has_lazy_stub(false); | |
6884 | } | |
6885 | } | |
6886 | ||
6887 | // Set stub offsets for symbols. This method expects that the number of | |
6888 | // entries in dynamic symbol table is set. | |
6889 | ||
6890 | template<int size, bool big_endian> | |
6891 | void | |
6892 | Mips_output_data_mips_stubs<size, big_endian>::set_lazy_stub_offsets() | |
6893 | { | |
6894 | gold_assert(this->dynsym_count_ != -1U); | |
6895 | ||
6896 | if (this->stub_offsets_are_set_) | |
6897 | return; | |
6898 | ||
6899 | unsigned int stub_size = this->stub_size(); | |
6900 | unsigned int offset = 0; | |
6901 | for (typename Unordered_set<Mips_symbol<size>*>::const_iterator | |
6902 | p = this->symbols_.begin(); | |
6903 | p != this->symbols_.end(); | |
6904 | ++p, offset += stub_size) | |
6905 | { | |
6906 | Mips_symbol<size>* mips_sym = *p; | |
6907 | mips_sym->set_lazy_stub_offset(offset); | |
6908 | } | |
6909 | this->stub_offsets_are_set_ = true; | |
6910 | } | |
6911 | ||
6912 | template<int size, bool big_endian> | |
6913 | void | |
6914 | Mips_output_data_mips_stubs<size, big_endian>::set_needs_dynsym_value() | |
6915 | { | |
6916 | for (typename Unordered_set<Mips_symbol<size>*>::const_iterator | |
6917 | p = this->symbols_.begin(); p != this->symbols_.end(); ++p) | |
6918 | { | |
6919 | Mips_symbol<size>* sym = *p; | |
6920 | if (sym->is_from_dynobj()) | |
6921 | sym->set_needs_dynsym_value(); | |
6922 | } | |
6923 | } | |
6924 | ||
6925 | // Write out the .MIPS.stubs. This uses the hand-coded instructions and | |
6926 | // adjusts them as needed. | |
6927 | ||
6928 | template<int size, bool big_endian> | |
6929 | void | |
6930 | Mips_output_data_mips_stubs<size, big_endian>::do_write(Output_file* of) | |
6931 | { | |
6932 | const off_t offset = this->offset(); | |
6933 | const section_size_type oview_size = | |
6934 | convert_to_section_size_type(this->data_size()); | |
6935 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
6936 | ||
6937 | bool big_stub = this->dynsym_count_ > 0x10000; | |
6938 | ||
6939 | unsigned char* pov = oview; | |
6940 | for (typename Unordered_set<Mips_symbol<size>*>::const_iterator | |
6941 | p = this->symbols_.begin(); p != this->symbols_.end(); ++p) | |
6942 | { | |
6943 | Mips_symbol<size>* sym = *p; | |
6944 | const uint32_t* lazy_stub; | |
6945 | bool n64 = this->target_->is_output_n64(); | |
6946 | ||
6947 | if (!this->target_->is_output_micromips()) | |
6948 | { | |
6949 | // Write standard (non-microMIPS) stub. | |
6950 | if (!big_stub) | |
6951 | { | |
6952 | if (sym->dynsym_index() & ~0x7fff) | |
6953 | // Dynsym index is between 32K and 64K. | |
6954 | lazy_stub = n64 ? lazy_stub_normal_2_n64 : lazy_stub_normal_2; | |
6955 | else | |
6956 | // Dynsym index is less than 32K. | |
6957 | lazy_stub = n64 ? lazy_stub_normal_1_n64 : lazy_stub_normal_1; | |
6958 | } | |
6959 | else | |
6960 | lazy_stub = n64 ? lazy_stub_big_n64 : lazy_stub_big; | |
6961 | ||
6962 | unsigned int i = 0; | |
6963 | elfcpp::Swap<32, big_endian>::writeval(pov, lazy_stub[i]); | |
6964 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, lazy_stub[i + 1]); | |
6965 | pov += 8; | |
6966 | ||
6967 | i += 2; | |
6968 | if (big_stub) | |
6969 | { | |
6970 | // LUI instruction of the big stub. Paste high 16 bits of the | |
6971 | // dynsym index. | |
6972 | elfcpp::Swap<32, big_endian>::writeval(pov, | |
6973 | lazy_stub[i] | ((sym->dynsym_index() >> 16) & 0x7fff)); | |
6974 | pov += 4; | |
6975 | i += 1; | |
6976 | } | |
6977 | elfcpp::Swap<32, big_endian>::writeval(pov, lazy_stub[i]); | |
6978 | // Last stub instruction. Paste low 16 bits of the dynsym index. | |
6979 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, | |
6980 | lazy_stub[i + 1] | (sym->dynsym_index() & 0xffff)); | |
6981 | pov += 8; | |
6982 | } | |
6983 | else if (this->target_->use_32bit_micromips_instructions()) | |
6984 | { | |
6985 | // Write microMIPS stub in insn32 mode. | |
6986 | if (!big_stub) | |
6987 | { | |
6988 | if (sym->dynsym_index() & ~0x7fff) | |
6989 | // Dynsym index is between 32K and 64K. | |
6990 | lazy_stub = n64 ? lazy_stub_micromips32_normal_2_n64 | |
6991 | : lazy_stub_micromips32_normal_2; | |
6992 | else | |
6993 | // Dynsym index is less than 32K. | |
6994 | lazy_stub = n64 ? lazy_stub_micromips32_normal_1_n64 | |
6995 | : lazy_stub_micromips32_normal_1; | |
6996 | } | |
6997 | else | |
6998 | lazy_stub = n64 ? lazy_stub_micromips32_big_n64 | |
6999 | : lazy_stub_micromips32_big; | |
7000 | ||
7001 | unsigned int i = 0; | |
7002 | // First stub instruction. We emit 32-bit microMIPS instructions by | |
7003 | // emitting two 16-bit parts because on microMIPS the 16-bit part of | |
7004 | // the instruction where the opcode is must always come first, for | |
7005 | // both little and big endian. | |
7006 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); | |
7007 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lazy_stub[i + 1]); | |
7008 | // Second stub instruction. | |
7009 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, lazy_stub[i + 2]); | |
7010 | elfcpp::Swap<16, big_endian>::writeval(pov + 6, lazy_stub[i + 3]); | |
7011 | pov += 8; | |
7012 | i += 4; | |
7013 | if (big_stub) | |
7014 | { | |
7015 | // LUI instruction of the big stub. Paste high 16 bits of the | |
7016 | // dynsym index. | |
7017 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); | |
7018 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, | |
7019 | (sym->dynsym_index() >> 16) & 0x7fff); | |
7020 | pov += 4; | |
7021 | i += 2; | |
7022 | } | |
7023 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); | |
7024 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lazy_stub[i + 1]); | |
7025 | // Last stub instruction. Paste low 16 bits of the dynsym index. | |
7026 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, lazy_stub[i + 2]); | |
7027 | elfcpp::Swap<16, big_endian>::writeval(pov + 6, | |
7028 | sym->dynsym_index() & 0xffff); | |
7029 | pov += 8; | |
7030 | } | |
7031 | else | |
7032 | { | |
7033 | // Write microMIPS stub. | |
7034 | if (!big_stub) | |
7035 | { | |
7036 | if (sym->dynsym_index() & ~0x7fff) | |
7037 | // Dynsym index is between 32K and 64K. | |
7038 | lazy_stub = n64 ? lazy_stub_micromips_normal_2_n64 | |
7039 | : lazy_stub_micromips_normal_2; | |
7040 | else | |
7041 | // Dynsym index is less than 32K. | |
7042 | lazy_stub = n64 ? lazy_stub_micromips_normal_1_n64 | |
7043 | : lazy_stub_micromips_normal_1; | |
7044 | } | |
7045 | else | |
7046 | lazy_stub = n64 ? lazy_stub_micromips_big_n64 | |
7047 | : lazy_stub_micromips_big; | |
7048 | ||
7049 | unsigned int i = 0; | |
7050 | // First stub instruction. We emit 32-bit microMIPS instructions by | |
7051 | // emitting two 16-bit parts because on microMIPS the 16-bit part of | |
7052 | // the instruction where the opcode is must always come first, for | |
7053 | // both little and big endian. | |
7054 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); | |
7055 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lazy_stub[i + 1]); | |
7056 | // Second stub instruction. | |
7057 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, lazy_stub[i + 2]); | |
7058 | pov += 6; | |
7059 | i += 3; | |
7060 | if (big_stub) | |
7061 | { | |
7062 | // LUI instruction of the big stub. Paste high 16 bits of the | |
7063 | // dynsym index. | |
7064 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); | |
7065 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, | |
7066 | (sym->dynsym_index() >> 16) & 0x7fff); | |
7067 | pov += 4; | |
7068 | i += 2; | |
7069 | } | |
7070 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); | |
7071 | // Last stub instruction. Paste low 16 bits of the dynsym index. | |
7072 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lazy_stub[i + 1]); | |
7073 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, | |
7074 | sym->dynsym_index() & 0xffff); | |
7075 | pov += 6; | |
7076 | } | |
7077 | } | |
7078 | ||
7079 | // We always allocate 20 bytes for every stub, because final dynsym count is | |
7080 | // not known in method do_finalize_sections. There are 4 unused bytes per | |
7081 | // stub if final dynsym count is less than 0x10000. | |
7082 | unsigned int used = pov - oview; | |
7083 | unsigned int unused = big_stub ? 0 : this->symbols_.size() * 4; | |
7084 | gold_assert(static_cast<section_size_type>(used + unused) == oview_size); | |
7085 | ||
7086 | // Fill the unused space with zeroes. | |
7087 | // TODO(sasa): Can we strip unused bytes during the relaxation? | |
7088 | if (unused > 0) | |
7089 | memset(pov, 0, unused); | |
7090 | ||
7091 | of->write_output_view(offset, oview_size, oview); | |
7092 | } | |
7093 | ||
7094 | // Mips_output_section_reginfo methods. | |
7095 | ||
7096 | template<int size, bool big_endian> | |
7097 | void | |
7098 | Mips_output_section_reginfo<size, big_endian>::do_write(Output_file* of) | |
7099 | { | |
7100 | off_t offset = this->offset(); | |
7101 | off_t data_size = this->data_size(); | |
7102 | ||
7103 | unsigned char* view = of->get_output_view(offset, data_size); | |
7104 | elfcpp::Swap<size, big_endian>::writeval(view, this->gprmask_); | |
7105 | elfcpp::Swap<size, big_endian>::writeval(view + 4, this->cprmask1_); | |
7106 | elfcpp::Swap<size, big_endian>::writeval(view + 8, this->cprmask2_); | |
7107 | elfcpp::Swap<size, big_endian>::writeval(view + 12, this->cprmask3_); | |
7108 | elfcpp::Swap<size, big_endian>::writeval(view + 16, this->cprmask4_); | |
7109 | // Write the gp value. | |
7110 | elfcpp::Swap<size, big_endian>::writeval(view + 20, | |
7111 | this->target_->gp_value()); | |
7112 | ||
7113 | of->write_output_view(offset, data_size, view); | |
7114 | } | |
7115 | ||
7116 | // Mips_copy_relocs methods. | |
7117 | ||
7118 | // Emit any saved relocs. | |
7119 | ||
7120 | template<int sh_type, int size, bool big_endian> | |
7121 | void | |
7122 | Mips_copy_relocs<sh_type, size, big_endian>::emit_mips( | |
7123 | Output_data_reloc<sh_type, true, size, big_endian>* reloc_section, | |
7124 | Symbol_table* symtab, Layout* layout, Target_mips<size, big_endian>* target) | |
7125 | { | |
7126 | for (typename Copy_relocs<sh_type, size, big_endian>:: | |
7127 | Copy_reloc_entries::iterator p = this->entries_.begin(); | |
7128 | p != this->entries_.end(); | |
7129 | ++p) | |
7130 | emit_entry(*p, reloc_section, symtab, layout, target); | |
7131 | ||
7132 | // We no longer need the saved information. | |
7133 | this->entries_.clear(); | |
7134 | } | |
7135 | ||
7136 | // Emit the reloc if appropriate. | |
7137 | ||
7138 | template<int sh_type, int size, bool big_endian> | |
7139 | void | |
7140 | Mips_copy_relocs<sh_type, size, big_endian>::emit_entry( | |
7141 | Copy_reloc_entry& entry, | |
7142 | Output_data_reloc<sh_type, true, size, big_endian>* reloc_section, | |
7143 | Symbol_table* symtab, Layout* layout, Target_mips<size, big_endian>* target) | |
7144 | { | |
7145 | // If the symbol is no longer defined in a dynamic object, then we | |
7146 | // emitted a COPY relocation, and we do not want to emit this | |
7147 | // dynamic relocation. | |
7148 | if (!entry.sym_->is_from_dynobj()) | |
7149 | return; | |
7150 | ||
7151 | bool can_make_dynamic = (entry.reloc_type_ == elfcpp::R_MIPS_32 | |
7152 | || entry.reloc_type_ == elfcpp::R_MIPS_REL32 | |
7153 | || entry.reloc_type_ == elfcpp::R_MIPS_64); | |
7154 | ||
7155 | Mips_symbol<size>* sym = Mips_symbol<size>::as_mips_sym(entry.sym_); | |
7156 | if (can_make_dynamic && !sym->has_static_relocs()) | |
7157 | { | |
7158 | Mips_relobj<size, big_endian>* object = | |
7159 | Mips_relobj<size, big_endian>::as_mips_relobj(entry.relobj_); | |
7160 | target->got_section(symtab, layout)->record_global_got_symbol( | |
7161 | sym, object, entry.reloc_type_, true, false); | |
7162 | if (!symbol_references_local(sym, sym->should_add_dynsym_entry(symtab))) | |
7163 | target->rel_dyn_section(layout)->add_global(sym, elfcpp::R_MIPS_REL32, | |
7164 | entry.output_section_, entry.relobj_, entry.shndx_, entry.address_); | |
7165 | else | |
7166 | target->rel_dyn_section(layout)->add_symbolless_global_addend( | |
7167 | sym, elfcpp::R_MIPS_REL32, entry.output_section_, entry.relobj_, | |
7168 | entry.shndx_, entry.address_); | |
7169 | } | |
7170 | else | |
7171 | this->make_copy_reloc(symtab, layout, | |
7172 | static_cast<Sized_symbol<size>*>(entry.sym_), | |
7173 | reloc_section); | |
7174 | } | |
7175 | ||
7176 | // Target_mips methods. | |
7177 | ||
7178 | // Return the value to use for a dynamic symbol which requires special | |
7179 | // treatment. This is how we support equality comparisons of function | |
7180 | // pointers across shared library boundaries, as described in the | |
7181 | // processor specific ABI supplement. | |
7182 | ||
7183 | template<int size, bool big_endian> | |
7184 | uint64_t | |
7185 | Target_mips<size, big_endian>::do_dynsym_value(const Symbol* gsym) const | |
7186 | { | |
7187 | uint64_t value = 0; | |
7188 | const Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(gsym); | |
7189 | ||
7190 | if (!mips_sym->has_lazy_stub()) | |
7191 | { | |
7192 | if (mips_sym->has_plt_offset()) | |
7193 | { | |
7194 | // We distinguish between PLT entries and lazy-binding stubs by | |
7195 | // giving the former an st_other value of STO_MIPS_PLT. Set the | |
7196 | // value to the stub address if there are any relocations in the | |
7197 | // binary where pointer equality matters. | |
7198 | if (mips_sym->pointer_equality_needed()) | |
7199 | { | |
7200 | // Prefer a standard MIPS PLT entry. | |
7201 | if (mips_sym->has_mips_plt_offset()) | |
7202 | value = this->plt_section()->mips_entry_address(mips_sym); | |
7203 | else | |
7204 | value = this->plt_section()->comp_entry_address(mips_sym) + 1; | |
7205 | } | |
7206 | else | |
7207 | value = 0; | |
7208 | } | |
7209 | } | |
7210 | else | |
7211 | { | |
7212 | // First, set stub offsets for symbols. This method expects that the | |
7213 | // number of entries in dynamic symbol table is set. | |
7214 | this->mips_stubs_section()->set_lazy_stub_offsets(); | |
7215 | ||
7216 | // The run-time linker uses the st_value field of the symbol | |
7217 | // to reset the global offset table entry for this external | |
7218 | // to its stub address when unlinking a shared object. | |
7219 | value = this->mips_stubs_section()->stub_address(mips_sym); | |
7220 | } | |
7221 | ||
7222 | if (mips_sym->has_mips16_fn_stub()) | |
7223 | { | |
7224 | // If we have a MIPS16 function with a stub, the dynamic symbol must | |
7225 | // refer to the stub, since only the stub uses the standard calling | |
7226 | // conventions. | |
7227 | value = mips_sym->template | |
7228 | get_mips16_fn_stub<big_endian>()->output_address(); | |
7229 | } | |
7230 | ||
7231 | return value; | |
7232 | } | |
7233 | ||
7234 | // Get the dynamic reloc section, creating it if necessary. It's always | |
7235 | // .rel.dyn, even for MIPS64. | |
7236 | ||
7237 | template<int size, bool big_endian> | |
7238 | typename Target_mips<size, big_endian>::Reloc_section* | |
7239 | Target_mips<size, big_endian>::rel_dyn_section(Layout* layout) | |
7240 | { | |
7241 | if (this->rel_dyn_ == NULL) | |
7242 | { | |
7243 | gold_assert(layout != NULL); | |
7244 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); | |
7245 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
7246 | elfcpp::SHF_ALLOC, this->rel_dyn_, | |
7247 | ORDER_DYNAMIC_RELOCS, false); | |
7248 | ||
7249 | // First entry in .rel.dyn has to be null. | |
7250 | // This is hack - we define dummy output data and set its address to 0, | |
7251 | // and define absolute R_MIPS_NONE relocation with offset 0 against it. | |
7252 | // This ensures that the entry is null. | |
7253 | Output_data* od = new Output_data_zero_fill(0, 0); | |
7254 | od->set_address(0); | |
7255 | this->rel_dyn_->add_absolute(elfcpp::R_MIPS_NONE, od, 0); | |
7256 | } | |
7257 | return this->rel_dyn_; | |
7258 | } | |
7259 | ||
7260 | // Get the GOT section, creating it if necessary. | |
7261 | ||
7262 | template<int size, bool big_endian> | |
7263 | Mips_output_data_got<size, big_endian>* | |
7264 | Target_mips<size, big_endian>::got_section(Symbol_table* symtab, | |
7265 | Layout* layout) | |
7266 | { | |
7267 | if (this->got_ == NULL) | |
7268 | { | |
7269 | gold_assert(symtab != NULL && layout != NULL); | |
7270 | ||
7271 | this->got_ = new Mips_output_data_got<size, big_endian>(this, symtab, | |
7272 | layout); | |
7273 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
7274 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE | | |
7275 | elfcpp::SHF_MIPS_GPREL), | |
7276 | this->got_, ORDER_DATA, false); | |
7277 | ||
7278 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section. | |
7279 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
7280 | Symbol_table::PREDEFINED, | |
7281 | this->got_, | |
7282 | 0, 0, elfcpp::STT_OBJECT, | |
7283 | elfcpp::STB_GLOBAL, | |
7284 | elfcpp::STV_DEFAULT, 0, | |
7285 | false, false); | |
7286 | } | |
7287 | ||
7288 | return this->got_; | |
7289 | } | |
7290 | ||
7291 | // Calculate value of _gp symbol. | |
7292 | ||
7293 | template<int size, bool big_endian> | |
7294 | void | |
7295 | Target_mips<size, big_endian>::set_gp(Layout* layout, Symbol_table* symtab) | |
7296 | { | |
7297 | if (this->gp_ != NULL) | |
7298 | return; | |
7299 | ||
7300 | Output_data* section = layout->find_output_section(".got"); | |
7301 | if (section == NULL) | |
7302 | { | |
7303 | // If there is no .got section, gp should be based on .sdata. | |
7304 | // TODO(sasa): This is probably not needed. This was needed for older | |
7305 | // MIPS architectures which accessed both GOT and .sdata section using | |
7306 | // gp-relative addressing. Modern Mips Linux ELF architectures don't | |
7307 | // access .sdata using gp-relative addressing. | |
7308 | for (Layout::Section_list::const_iterator | |
7309 | p = layout->section_list().begin(); | |
7310 | p != layout->section_list().end(); | |
7311 | ++p) | |
7312 | { | |
7313 | if (strcmp((*p)->name(), ".sdata") == 0) | |
7314 | { | |
7315 | section = *p; | |
7316 | break; | |
7317 | } | |
7318 | } | |
7319 | } | |
7320 | ||
7321 | Sized_symbol<size>* gp = | |
7322 | static_cast<Sized_symbol<size>*>(symtab->lookup("_gp")); | |
7323 | if (gp != NULL) | |
7324 | { | |
7325 | if (gp->source() != Symbol::IS_CONSTANT && section != NULL) | |
7326 | gp->init_output_data(gp->name(), NULL, section, MIPS_GP_OFFSET, 0, | |
7327 | elfcpp::STT_OBJECT, | |
7328 | elfcpp::STB_GLOBAL, | |
7329 | elfcpp::STV_DEFAULT, 0, | |
7330 | false, false); | |
7331 | this->gp_ = gp; | |
7332 | } | |
7333 | else if (section != NULL) | |
7334 | { | |
7335 | gp = static_cast<Sized_symbol<size>*>(symtab->define_in_output_data( | |
7336 | "_gp", NULL, Symbol_table::PREDEFINED, | |
7337 | section, MIPS_GP_OFFSET, 0, | |
7338 | elfcpp::STT_OBJECT, | |
7339 | elfcpp::STB_GLOBAL, | |
7340 | elfcpp::STV_DEFAULT, | |
7341 | 0, false, false)); | |
7342 | this->gp_ = gp; | |
7343 | } | |
7344 | } | |
7345 | ||
7346 | // Set the dynamic symbol indexes. INDEX is the index of the first | |
7347 | // global dynamic symbol. Pointers to the symbols are stored into the | |
7348 | // vector SYMS. The names are added to DYNPOOL. This returns an | |
7349 | // updated dynamic symbol index. | |
7350 | ||
7351 | template<int size, bool big_endian> | |
7352 | unsigned int | |
7353 | Target_mips<size, big_endian>::do_set_dynsym_indexes( | |
7354 | std::vector<Symbol*>* dyn_symbols, unsigned int index, | |
7355 | std::vector<Symbol*>* syms, Stringpool* dynpool, | |
7356 | Versions* versions, Symbol_table* symtab) const | |
7357 | { | |
7358 | std::vector<Symbol*> non_got_symbols; | |
7359 | std::vector<Symbol*> got_symbols; | |
7360 | ||
7361 | reorder_dyn_symbols<size, big_endian>(dyn_symbols, &non_got_symbols, | |
7362 | &got_symbols); | |
7363 | ||
7364 | for (std::vector<Symbol*>::iterator p = non_got_symbols.begin(); | |
7365 | p != non_got_symbols.end(); | |
7366 | ++p) | |
7367 | { | |
7368 | Symbol* sym = *p; | |
7369 | ||
7370 | // Note that SYM may already have a dynamic symbol index, since | |
7371 | // some symbols appear more than once in the symbol table, with | |
7372 | // and without a version. | |
7373 | ||
7374 | if (!sym->has_dynsym_index()) | |
7375 | { | |
7376 | sym->set_dynsym_index(index); | |
7377 | ++index; | |
7378 | syms->push_back(sym); | |
7379 | dynpool->add(sym->name(), false, NULL); | |
7380 | ||
7381 | // Record any version information. | |
7382 | if (sym->version() != NULL) | |
7383 | versions->record_version(symtab, dynpool, sym); | |
7384 | ||
7385 | // If the symbol is defined in a dynamic object and is | |
7386 | // referenced in a regular object, then mark the dynamic | |
7387 | // object as needed. This is used to implement --as-needed. | |
7388 | if (sym->is_from_dynobj() && sym->in_reg()) | |
7389 | sym->object()->set_is_needed(); | |
7390 | } | |
7391 | } | |
7392 | ||
7393 | for (std::vector<Symbol*>::iterator p = got_symbols.begin(); | |
7394 | p != got_symbols.end(); | |
7395 | ++p) | |
7396 | { | |
7397 | Symbol* sym = *p; | |
7398 | if (!sym->has_dynsym_index()) | |
7399 | { | |
7400 | // Record any version information. | |
7401 | if (sym->version() != NULL) | |
7402 | versions->record_version(symtab, dynpool, sym); | |
7403 | } | |
7404 | } | |
7405 | ||
7406 | index = versions->finalize(symtab, index, syms); | |
7407 | ||
7408 | int got_sym_count = 0; | |
7409 | for (std::vector<Symbol*>::iterator p = got_symbols.begin(); | |
7410 | p != got_symbols.end(); | |
7411 | ++p) | |
7412 | { | |
7413 | Symbol* sym = *p; | |
7414 | ||
7415 | if (!sym->has_dynsym_index()) | |
7416 | { | |
7417 | ++got_sym_count; | |
7418 | sym->set_dynsym_index(index); | |
7419 | ++index; | |
7420 | syms->push_back(sym); | |
7421 | dynpool->add(sym->name(), false, NULL); | |
7422 | ||
7423 | // If the symbol is defined in a dynamic object and is | |
7424 | // referenced in a regular object, then mark the dynamic | |
7425 | // object as needed. This is used to implement --as-needed. | |
7426 | if (sym->is_from_dynobj() && sym->in_reg()) | |
7427 | sym->object()->set_is_needed(); | |
7428 | } | |
7429 | } | |
7430 | ||
7431 | // Set index of the first symbol that has .got entry. | |
7432 | this->got_->set_first_global_got_dynsym_index( | |
7433 | got_sym_count > 0 ? index - got_sym_count : -1U); | |
7434 | ||
7435 | if (this->mips_stubs_ != NULL) | |
7436 | this->mips_stubs_->set_dynsym_count(index); | |
7437 | ||
7438 | return index; | |
7439 | } | |
7440 | ||
7441 | // Create a PLT entry for a global symbol referenced by r_type relocation. | |
7442 | ||
7443 | template<int size, bool big_endian> | |
7444 | void | |
7445 | Target_mips<size, big_endian>::make_plt_entry(Symbol_table* symtab, | |
7446 | Layout* layout, | |
7447 | Mips_symbol<size>* gsym, | |
7448 | unsigned int r_type) | |
7449 | { | |
7450 | if (gsym->has_lazy_stub() || gsym->has_plt_offset()) | |
7451 | return; | |
7452 | ||
7453 | if (this->plt_ == NULL) | |
7454 | { | |
7455 | // Create the GOT section first. | |
7456 | this->got_section(symtab, layout); | |
7457 | ||
7458 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); | |
7459 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
7460 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), | |
7461 | this->got_plt_, ORDER_DATA, false); | |
7462 | ||
7463 | // The first two entries are reserved. | |
7464 | this->got_plt_->set_current_data_size(2 * size/8); | |
7465 | ||
7466 | this->plt_ = new Mips_output_data_plt<size, big_endian>(layout, | |
7467 | this->got_plt_, | |
7468 | this); | |
7469 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
7470 | (elfcpp::SHF_ALLOC | |
7471 | | elfcpp::SHF_EXECINSTR), | |
7472 | this->plt_, ORDER_PLT, false); | |
7473 | } | |
7474 | ||
7475 | this->plt_->add_entry(gsym, r_type); | |
7476 | } | |
7477 | ||
7478 | ||
7479 | // Get the .MIPS.stubs section, creating it if necessary. | |
7480 | ||
7481 | template<int size, bool big_endian> | |
7482 | Mips_output_data_mips_stubs<size, big_endian>* | |
7483 | Target_mips<size, big_endian>::mips_stubs_section(Layout* layout) | |
7484 | { | |
7485 | if (this->mips_stubs_ == NULL) | |
7486 | { | |
7487 | this->mips_stubs_ = | |
7488 | new Mips_output_data_mips_stubs<size, big_endian>(this); | |
7489 | layout->add_output_section_data(".MIPS.stubs", elfcpp::SHT_PROGBITS, | |
7490 | (elfcpp::SHF_ALLOC | |
7491 | | elfcpp::SHF_EXECINSTR), | |
7492 | this->mips_stubs_, ORDER_PLT, false); | |
7493 | } | |
7494 | return this->mips_stubs_; | |
7495 | } | |
7496 | ||
7497 | // Get the LA25 stub section, creating it if necessary. | |
7498 | ||
7499 | template<int size, bool big_endian> | |
7500 | Mips_output_data_la25_stub<size, big_endian>* | |
7501 | Target_mips<size, big_endian>::la25_stub_section(Layout* layout) | |
7502 | { | |
7503 | if (this->la25_stub_ == NULL) | |
7504 | { | |
7505 | this->la25_stub_ = new Mips_output_data_la25_stub<size, big_endian>(); | |
7506 | layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS, | |
7507 | (elfcpp::SHF_ALLOC | |
7508 | | elfcpp::SHF_EXECINSTR), | |
7509 | this->la25_stub_, ORDER_TEXT, false); | |
7510 | } | |
7511 | return this->la25_stub_; | |
7512 | } | |
7513 | ||
7514 | // Process the relocations to determine unreferenced sections for | |
7515 | // garbage collection. | |
7516 | ||
7517 | template<int size, bool big_endian> | |
7518 | void | |
7519 | Target_mips<size, big_endian>::gc_process_relocs( | |
7520 | Symbol_table* symtab, | |
7521 | Layout* layout, | |
7522 | Sized_relobj_file<size, big_endian>* object, | |
7523 | unsigned int data_shndx, | |
7524 | unsigned int, | |
7525 | const unsigned char* prelocs, | |
7526 | size_t reloc_count, | |
7527 | Output_section* output_section, | |
7528 | bool needs_special_offset_handling, | |
7529 | size_t local_symbol_count, | |
7530 | const unsigned char* plocal_symbols) | |
7531 | { | |
7532 | typedef Target_mips<size, big_endian> Mips; | |
7533 | typedef typename Target_mips<size, big_endian>::Scan Scan; | |
7534 | ||
7535 | gold::gc_process_relocs<size, big_endian, Mips, elfcpp::SHT_REL, Scan, | |
7536 | typename Target_mips::Relocatable_size_for_reloc>( | |
7537 | symtab, | |
7538 | layout, | |
7539 | this, | |
7540 | object, | |
7541 | data_shndx, | |
7542 | prelocs, | |
7543 | reloc_count, | |
7544 | output_section, | |
7545 | needs_special_offset_handling, | |
7546 | local_symbol_count, | |
7547 | plocal_symbols); | |
7548 | } | |
7549 | ||
7550 | // Scan relocations for a section. | |
7551 | ||
7552 | template<int size, bool big_endian> | |
7553 | void | |
7554 | Target_mips<size, big_endian>::scan_relocs( | |
7555 | Symbol_table* symtab, | |
7556 | Layout* layout, | |
7557 | Sized_relobj_file<size, big_endian>* object, | |
7558 | unsigned int data_shndx, | |
7559 | unsigned int sh_type, | |
7560 | const unsigned char* prelocs, | |
7561 | size_t reloc_count, | |
7562 | Output_section* output_section, | |
7563 | bool needs_special_offset_handling, | |
7564 | size_t local_symbol_count, | |
7565 | const unsigned char* plocal_symbols) | |
7566 | { | |
7567 | typedef Target_mips<size, big_endian> Mips; | |
7568 | typedef typename Target_mips<size, big_endian>::Scan Scan; | |
7569 | ||
7570 | if (sh_type == elfcpp::SHT_REL) | |
7571 | gold::scan_relocs<size, big_endian, Mips, elfcpp::SHT_REL, Scan>( | |
7572 | symtab, | |
7573 | layout, | |
7574 | this, | |
7575 | object, | |
7576 | data_shndx, | |
7577 | prelocs, | |
7578 | reloc_count, | |
7579 | output_section, | |
7580 | needs_special_offset_handling, | |
7581 | local_symbol_count, | |
7582 | plocal_symbols); | |
7583 | else if (sh_type == elfcpp::SHT_RELA) | |
7584 | gold::scan_relocs<size, big_endian, Mips, elfcpp::SHT_RELA, Scan>( | |
7585 | symtab, | |
7586 | layout, | |
7587 | this, | |
7588 | object, | |
7589 | data_shndx, | |
7590 | prelocs, | |
7591 | reloc_count, | |
7592 | output_section, | |
7593 | needs_special_offset_handling, | |
7594 | local_symbol_count, | |
7595 | plocal_symbols); | |
7596 | } | |
7597 | ||
7598 | template<int size, bool big_endian> | |
7599 | bool | |
7600 | Target_mips<size, big_endian>::mips_32bit_flags(elfcpp::Elf_Word flags) | |
7601 | { | |
7602 | return ((flags & elfcpp::EF_MIPS_32BITMODE) != 0 | |
7603 | || (flags & elfcpp::EF_MIPS_ABI) == elfcpp::E_MIPS_ABI_O32 | |
7604 | || (flags & elfcpp::EF_MIPS_ABI) == elfcpp::E_MIPS_ABI_EABI32 | |
7605 | || (flags & elfcpp::EF_MIPS_ARCH) == elfcpp::E_MIPS_ARCH_1 | |
7606 | || (flags & elfcpp::EF_MIPS_ARCH) == elfcpp::E_MIPS_ARCH_2 | |
7607 | || (flags & elfcpp::EF_MIPS_ARCH) == elfcpp::E_MIPS_ARCH_32 | |
7608 | || (flags & elfcpp::EF_MIPS_ARCH) == elfcpp::E_MIPS_ARCH_32R2); | |
7609 | } | |
7610 | ||
7611 | // Return the MACH for a MIPS e_flags value. | |
7612 | template<int size, bool big_endian> | |
7613 | unsigned int | |
7614 | Target_mips<size, big_endian>::elf_mips_mach(elfcpp::Elf_Word flags) | |
7615 | { | |
7616 | switch (flags & elfcpp::EF_MIPS_MACH) | |
7617 | { | |
7618 | case elfcpp::E_MIPS_MACH_3900: | |
7619 | return mach_mips3900; | |
7620 | ||
7621 | case elfcpp::E_MIPS_MACH_4010: | |
7622 | return mach_mips4010; | |
7623 | ||
7624 | case elfcpp::E_MIPS_MACH_4100: | |
7625 | return mach_mips4100; | |
7626 | ||
7627 | case elfcpp::E_MIPS_MACH_4111: | |
7628 | return mach_mips4111; | |
7629 | ||
7630 | case elfcpp::E_MIPS_MACH_4120: | |
7631 | return mach_mips4120; | |
7632 | ||
7633 | case elfcpp::E_MIPS_MACH_4650: | |
7634 | return mach_mips4650; | |
7635 | ||
7636 | case elfcpp::E_MIPS_MACH_5400: | |
7637 | return mach_mips5400; | |
7638 | ||
7639 | case elfcpp::E_MIPS_MACH_5500: | |
7640 | return mach_mips5500; | |
7641 | ||
7642 | case elfcpp::E_MIPS_MACH_9000: | |
7643 | return mach_mips9000; | |
7644 | ||
7645 | case elfcpp::E_MIPS_MACH_SB1: | |
7646 | return mach_mips_sb1; | |
7647 | ||
7648 | case elfcpp::E_MIPS_MACH_LS2E: | |
7649 | return mach_mips_loongson_2e; | |
7650 | ||
7651 | case elfcpp::E_MIPS_MACH_LS2F: | |
7652 | return mach_mips_loongson_2f; | |
7653 | ||
7654 | case elfcpp::E_MIPS_MACH_LS3A: | |
7655 | return mach_mips_loongson_3a; | |
7656 | ||
7657 | case elfcpp::E_MIPS_MACH_OCTEON2: | |
7658 | return mach_mips_octeon2; | |
7659 | ||
7660 | case elfcpp::E_MIPS_MACH_OCTEON: | |
7661 | return mach_mips_octeon; | |
7662 | ||
7663 | case elfcpp::E_MIPS_MACH_XLR: | |
7664 | return mach_mips_xlr; | |
7665 | ||
7666 | default: | |
7667 | switch (flags & elfcpp::EF_MIPS_ARCH) | |
7668 | { | |
7669 | default: | |
7670 | case elfcpp::E_MIPS_ARCH_1: | |
7671 | return mach_mips3000; | |
7672 | ||
7673 | case elfcpp::E_MIPS_ARCH_2: | |
7674 | return mach_mips6000; | |
7675 | ||
7676 | case elfcpp::E_MIPS_ARCH_3: | |
7677 | return mach_mips4000; | |
7678 | ||
7679 | case elfcpp::E_MIPS_ARCH_4: | |
7680 | return mach_mips8000; | |
7681 | ||
7682 | case elfcpp::E_MIPS_ARCH_5: | |
7683 | return mach_mips5; | |
7684 | ||
7685 | case elfcpp::E_MIPS_ARCH_32: | |
7686 | return mach_mipsisa32; | |
7687 | ||
7688 | case elfcpp::E_MIPS_ARCH_64: | |
7689 | return mach_mipsisa64; | |
7690 | ||
7691 | case elfcpp::E_MIPS_ARCH_32R2: | |
7692 | return mach_mipsisa32r2; | |
7693 | ||
7694 | case elfcpp::E_MIPS_ARCH_64R2: | |
7695 | return mach_mipsisa64r2; | |
7696 | } | |
7697 | } | |
7698 | ||
7699 | return 0; | |
7700 | } | |
7701 | ||
7702 | // Check whether machine EXTENSION is an extension of machine BASE. | |
7703 | template<int size, bool big_endian> | |
7704 | bool | |
7705 | Target_mips<size, big_endian>::mips_mach_extends(unsigned int base, | |
7706 | unsigned int extension) | |
7707 | { | |
7708 | if (extension == base) | |
7709 | return true; | |
7710 | ||
7711 | if ((base == mach_mipsisa32) | |
7712 | && this->mips_mach_extends(mach_mipsisa64, extension)) | |
7713 | return true; | |
7714 | ||
7715 | if ((base == mach_mipsisa32r2) | |
7716 | && this->mips_mach_extends(mach_mipsisa64r2, extension)) | |
7717 | return true; | |
7718 | ||
7719 | for (unsigned int i = 0; i < this->mips_mach_extensions_.size(); ++i) | |
7720 | if (extension == this->mips_mach_extensions_[i].first) | |
7721 | { | |
7722 | extension = this->mips_mach_extensions_[i].second; | |
7723 | if (extension == base) | |
7724 | return true; | |
7725 | } | |
7726 | ||
7727 | return false; | |
7728 | } | |
7729 | ||
7730 | template<int size, bool big_endian> | |
7731 | void | |
7732 | Target_mips<size, big_endian>::merge_processor_specific_flags( | |
7733 | const std::string& name, elfcpp::Elf_Word in_flags, | |
7734 | unsigned char in_ei_class, bool dyn_obj) | |
7735 | { | |
7736 | // If flags are not set yet, just copy them. | |
7737 | if (!this->are_processor_specific_flags_set()) | |
7738 | { | |
7739 | this->set_processor_specific_flags(in_flags); | |
7740 | this->ei_class_ = in_ei_class; | |
7741 | this->mach_ = this->elf_mips_mach(in_flags); | |
7742 | return; | |
7743 | } | |
7744 | ||
7745 | elfcpp::Elf_Word new_flags = in_flags; | |
7746 | elfcpp::Elf_Word old_flags = this->processor_specific_flags(); | |
7747 | elfcpp::Elf_Word merged_flags = this->processor_specific_flags(); | |
7748 | merged_flags |= new_flags & elfcpp::EF_MIPS_NOREORDER; | |
7749 | ||
7750 | // Check flag compatibility. | |
7751 | new_flags &= ~elfcpp::EF_MIPS_NOREORDER; | |
7752 | old_flags &= ~elfcpp::EF_MIPS_NOREORDER; | |
7753 | ||
7754 | // Some IRIX 6 BSD-compatibility objects have this bit set. It | |
7755 | // doesn't seem to matter. | |
7756 | new_flags &= ~elfcpp::EF_MIPS_XGOT; | |
7757 | old_flags &= ~elfcpp::EF_MIPS_XGOT; | |
7758 | ||
7759 | // MIPSpro generates ucode info in n64 objects. Again, we should | |
7760 | // just be able to ignore this. | |
7761 | new_flags &= ~elfcpp::EF_MIPS_UCODE; | |
7762 | old_flags &= ~elfcpp::EF_MIPS_UCODE; | |
7763 | ||
7764 | // DSOs should only be linked with CPIC code. | |
7765 | if (dyn_obj) | |
7766 | new_flags |= elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC; | |
7767 | ||
7768 | if (new_flags == old_flags) | |
7769 | { | |
7770 | this->set_processor_specific_flags(merged_flags); | |
7771 | return; | |
7772 | } | |
7773 | ||
7774 | if (((new_flags & (elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC)) != 0) | |
7775 | != ((old_flags & (elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC)) != 0)) | |
7776 | gold_warning(_("%s: linking abicalls files with non-abicalls files"), | |
7777 | name.c_str()); | |
7778 | ||
7779 | if (new_flags & (elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC)) | |
7780 | merged_flags |= elfcpp::EF_MIPS_CPIC; | |
7781 | if (!(new_flags & elfcpp::EF_MIPS_PIC)) | |
7782 | merged_flags &= ~elfcpp::EF_MIPS_PIC; | |
7783 | ||
7784 | new_flags &= ~(elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC); | |
7785 | old_flags &= ~(elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC); | |
7786 | ||
7787 | // Compare the ISAs. | |
7788 | if (mips_32bit_flags(old_flags) != mips_32bit_flags(new_flags)) | |
7789 | gold_error(_("%s: linking 32-bit code with 64-bit code"), name.c_str()); | |
7790 | else if (!this->mips_mach_extends(this->elf_mips_mach(in_flags), this->mach_)) | |
7791 | { | |
7792 | // Output ISA isn't the same as, or an extension of, input ISA. | |
7793 | if (this->mips_mach_extends(this->mach_, this->elf_mips_mach(in_flags))) | |
7794 | { | |
7795 | // Copy the architecture info from input object to output. Also copy | |
7796 | // the 32-bit flag (if set) so that we continue to recognise | |
7797 | // output as a 32-bit binary. | |
7798 | this->mach_ = this->elf_mips_mach(in_flags); | |
7799 | merged_flags &= ~(elfcpp::EF_MIPS_ARCH | elfcpp::EF_MIPS_MACH); | |
7800 | merged_flags |= (new_flags & (elfcpp::EF_MIPS_ARCH | |
7801 | | elfcpp::EF_MIPS_MACH | elfcpp::EF_MIPS_32BITMODE)); | |
7802 | ||
7803 | // Copy across the ABI flags if output doesn't use them | |
7804 | // and if that was what caused us to treat input object as 32-bit. | |
7805 | if ((old_flags & elfcpp::EF_MIPS_ABI) == 0 | |
7806 | && this->mips_32bit_flags(new_flags) | |
7807 | && !this->mips_32bit_flags(new_flags & ~elfcpp::EF_MIPS_ABI)) | |
7808 | merged_flags |= new_flags & elfcpp::EF_MIPS_ABI; | |
7809 | } | |
7810 | else | |
7811 | // The ISAs aren't compatible. | |
7812 | gold_error(_("%s: linking %s module with previous %s modules"), | |
7813 | name.c_str(), this->elf_mips_mach_name(in_flags), | |
7814 | this->elf_mips_mach_name(merged_flags)); | |
7815 | } | |
7816 | ||
7817 | new_flags &= (~(elfcpp::EF_MIPS_ARCH | elfcpp::EF_MIPS_MACH | |
7818 | | elfcpp::EF_MIPS_32BITMODE)); | |
7819 | old_flags &= (~(elfcpp::EF_MIPS_ARCH | elfcpp::EF_MIPS_MACH | |
7820 | | elfcpp::EF_MIPS_32BITMODE)); | |
7821 | ||
7822 | // Compare ABIs. The 64-bit ABI does not use EF_MIPS_ABI. But, it does set | |
7823 | // EI_CLASS differently from any 32-bit ABI. | |
7824 | if ((new_flags & elfcpp::EF_MIPS_ABI) != (old_flags & elfcpp::EF_MIPS_ABI) | |
7825 | || (in_ei_class != this->ei_class_)) | |
7826 | { | |
7827 | // Only error if both are set (to different values). | |
7828 | if (((new_flags & elfcpp::EF_MIPS_ABI) | |
7829 | && (old_flags & elfcpp::EF_MIPS_ABI)) | |
7830 | || (in_ei_class != this->ei_class_)) | |
7831 | gold_error(_("%s: ABI mismatch: linking %s module with " | |
7832 | "previous %s modules"), name.c_str(), | |
7833 | this->elf_mips_abi_name(in_flags, in_ei_class), | |
7834 | this->elf_mips_abi_name(merged_flags, this->ei_class_)); | |
7835 | ||
7836 | new_flags &= ~elfcpp::EF_MIPS_ABI; | |
7837 | old_flags &= ~elfcpp::EF_MIPS_ABI; | |
7838 | } | |
7839 | ||
7840 | // Compare ASEs. Forbid linking MIPS16 and microMIPS ASE modules together | |
7841 | // and allow arbitrary mixing of the remaining ASEs (retain the union). | |
7842 | if ((new_flags & elfcpp::EF_MIPS_ARCH_ASE) | |
7843 | != (old_flags & elfcpp::EF_MIPS_ARCH_ASE)) | |
7844 | { | |
7845 | int old_micro = old_flags & elfcpp::EF_MIPS_ARCH_ASE_MICROMIPS; | |
7846 | int new_micro = new_flags & elfcpp::EF_MIPS_ARCH_ASE_MICROMIPS; | |
7847 | int old_m16 = old_flags & elfcpp::EF_MIPS_ARCH_ASE_M16; | |
7848 | int new_m16 = new_flags & elfcpp::EF_MIPS_ARCH_ASE_M16; | |
7849 | int micro_mis = old_m16 && new_micro; | |
7850 | int m16_mis = old_micro && new_m16; | |
7851 | ||
7852 | if (m16_mis || micro_mis) | |
7853 | gold_error(_("%s: ASE mismatch: linking %s module with " | |
7854 | "previous %s modules"), name.c_str(), | |
7855 | m16_mis ? "MIPS16" : "microMIPS", | |
7856 | m16_mis ? "microMIPS" : "MIPS16"); | |
7857 | ||
7858 | merged_flags |= new_flags & elfcpp::EF_MIPS_ARCH_ASE; | |
7859 | ||
7860 | new_flags &= ~ elfcpp::EF_MIPS_ARCH_ASE; | |
7861 | old_flags &= ~ elfcpp::EF_MIPS_ARCH_ASE; | |
7862 | } | |
7863 | ||
7864 | // Warn about any other mismatches. | |
7865 | if (new_flags != old_flags) | |
7866 | gold_error(_("%s: uses different e_flags (0x%x) fields than previous " | |
7867 | "modules (0x%x)"), name.c_str(), new_flags, old_flags); | |
7868 | ||
7869 | this->set_processor_specific_flags(merged_flags); | |
7870 | } | |
7871 | ||
7872 | // Adjust ELF file header. | |
7873 | ||
7874 | template<int size, bool big_endian> | |
7875 | void | |
7876 | Target_mips<size, big_endian>::do_adjust_elf_header( | |
7877 | unsigned char* view, | |
7878 | int len) | |
7879 | { | |
7880 | gold_assert(len == elfcpp::Elf_sizes<size>::ehdr_size); | |
7881 | ||
7882 | elfcpp::Ehdr<size, big_endian> ehdr(view); | |
7883 | unsigned char e_ident[elfcpp::EI_NIDENT]; | |
7884 | memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT); | |
7885 | ||
7886 | e_ident[elfcpp::EI_CLASS] = this->ei_class_; | |
7887 | ||
7888 | elfcpp::Ehdr_write<size, big_endian> oehdr(view); | |
7889 | oehdr.put_e_ident(e_ident); | |
7890 | if (this->entry_symbol_is_compressed_) | |
7891 | oehdr.put_e_entry(ehdr.get_e_entry() + 1); | |
7892 | } | |
7893 | ||
7894 | // do_make_elf_object to override the same function in the base class. | |
7895 | // We need to use a target-specific sub-class of | |
7896 | // Sized_relobj_file<size, big_endian> to store Mips specific information. | |
7897 | // Hence we need to have our own ELF object creation. | |
7898 | ||
7899 | template<int size, bool big_endian> | |
7900 | Object* | |
7901 | Target_mips<size, big_endian>::do_make_elf_object( | |
7902 | const std::string& name, | |
7903 | Input_file* input_file, | |
7904 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
7905 | { | |
7906 | int et = ehdr.get_e_type(); | |
7907 | // ET_EXEC files are valid input for --just-symbols/-R, | |
7908 | // and we treat them as relocatable objects. | |
7909 | if (et == elfcpp::ET_REL | |
7910 | || (et == elfcpp::ET_EXEC && input_file->just_symbols())) | |
7911 | { | |
7912 | Mips_relobj<size, big_endian>* obj = | |
7913 | new Mips_relobj<size, big_endian>(name, input_file, offset, ehdr); | |
7914 | obj->setup(); | |
7915 | return obj; | |
7916 | } | |
7917 | else if (et == elfcpp::ET_DYN) | |
7918 | { | |
7919 | // TODO(sasa): Should we create Mips_dynobj? | |
7920 | return Target::do_make_elf_object(name, input_file, offset, ehdr); | |
7921 | } | |
7922 | else | |
7923 | { | |
7924 | gold_error(_("%s: unsupported ELF file type %d"), | |
7925 | name.c_str(), et); | |
7926 | return NULL; | |
7927 | } | |
7928 | } | |
7929 | ||
7930 | // Finalize the sections. | |
7931 | ||
7932 | template <int size, bool big_endian> | |
7933 | void | |
7934 | Target_mips<size, big_endian>::do_finalize_sections(Layout* layout, | |
7935 | const Input_objects* input_objects, | |
7936 | Symbol_table* symtab) | |
7937 | { | |
7938 | // Add +1 to MIPS16 and microMIPS init_ and _fini symbols so that DT_INIT and | |
7939 | // DT_FINI have correct values. | |
7940 | Mips_symbol<size>* init = static_cast<Mips_symbol<size>*>( | |
7941 | symtab->lookup(parameters->options().init())); | |
7942 | if (init != NULL && (init->is_mips16() || init->is_micromips())) | |
7943 | init->set_value(init->value() | 1); | |
7944 | Mips_symbol<size>* fini = static_cast<Mips_symbol<size>*>( | |
7945 | symtab->lookup(parameters->options().fini())); | |
7946 | if (fini != NULL && (fini->is_mips16() || fini->is_micromips())) | |
7947 | fini->set_value(fini->value() | 1); | |
7948 | ||
7949 | // Check whether the entry symbol is mips16 or micromips. This is needed to | |
7950 | // adjust entry address in ELF header. | |
7951 | Mips_symbol<size>* entry = | |
7952 | static_cast<Mips_symbol<size>*>(symtab->lookup(this->entry_symbol_name())); | |
7953 | this->entry_symbol_is_compressed_ = (entry != NULL && (entry->is_mips16() | |
7954 | || entry->is_micromips())); | |
7955 | ||
7956 | if (!parameters->doing_static_link() | |
7957 | && (strcmp(parameters->options().hash_style(), "gnu") == 0 | |
7958 | || strcmp(parameters->options().hash_style(), "both") == 0)) | |
7959 | { | |
7960 | // .gnu.hash and the MIPS ABI require .dynsym to be sorted in different | |
7961 | // ways. .gnu.hash needs symbols to be grouped by hash code whereas the | |
7962 | // MIPS ABI requires a mapping between the GOT and the symbol table. | |
7963 | gold_error(".gnu.hash is incompatible with the MIPS ABI"); | |
7964 | } | |
7965 | ||
7966 | // Check whether the final section that was scanned has HI16 or GOT16 | |
7967 | // relocations without the corresponding LO16 part. | |
7968 | if (this->got16_addends_.size() > 0) | |
7969 | gold_error("Can't find matching LO16 reloc"); | |
7970 | ||
7971 | // Set _gp value. | |
7972 | this->set_gp(layout, symtab); | |
7973 | ||
7974 | // Check for any mips16 stub sections that we can discard. | |
7975 | if (!parameters->options().relocatable()) | |
7976 | { | |
7977 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
7978 | p != input_objects->relobj_end(); | |
7979 | ++p) | |
7980 | { | |
7981 | Mips_relobj<size, big_endian>* object = | |
7982 | Mips_relobj<size, big_endian>::as_mips_relobj(*p); | |
7983 | object->discard_mips16_stub_sections(symtab); | |
7984 | } | |
7985 | } | |
7986 | ||
7987 | // Merge processor-specific flags. | |
7988 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
7989 | p != input_objects->relobj_end(); | |
7990 | ++p) | |
7991 | { | |
7992 | Mips_relobj<size, big_endian>* relobj = | |
7993 | Mips_relobj<size, big_endian>::as_mips_relobj(*p); | |
7994 | ||
7995 | Input_file::Format format = relobj->input_file()->format(); | |
7996 | if (format == Input_file::FORMAT_ELF) | |
7997 | { | |
7998 | // Read processor-specific flags in ELF file header. | |
7999 | const unsigned char* pehdr = relobj->get_view( | |
8000 | elfcpp::file_header_offset, | |
8001 | elfcpp::Elf_sizes<size>::ehdr_size, | |
8002 | true, false); | |
8003 | ||
8004 | elfcpp::Ehdr<size, big_endian> ehdr(pehdr); | |
8005 | elfcpp::Elf_Word in_flags = ehdr.get_e_flags(); | |
8006 | unsigned char ei_class = ehdr.get_e_ident()[elfcpp::EI_CLASS]; | |
8007 | ||
8008 | this->merge_processor_specific_flags(relobj->name(), in_flags, | |
8009 | ei_class, false); | |
8010 | } | |
8011 | } | |
8012 | ||
8013 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); | |
8014 | p != input_objects->dynobj_end(); | |
8015 | ++p) | |
8016 | { | |
8017 | Sized_dynobj<size, big_endian>* dynobj = | |
8018 | static_cast<Sized_dynobj<size, big_endian>*>(*p); | |
8019 | ||
8020 | // Read processor-specific flags. | |
8021 | const unsigned char* pehdr = dynobj->get_view(elfcpp::file_header_offset, | |
8022 | elfcpp::Elf_sizes<size>::ehdr_size, | |
8023 | true, false); | |
8024 | ||
8025 | elfcpp::Ehdr<size, big_endian> ehdr(pehdr); | |
8026 | elfcpp::Elf_Word in_flags = ehdr.get_e_flags(); | |
8027 | unsigned char ei_class = ehdr.get_e_ident()[elfcpp::EI_CLASS]; | |
8028 | ||
8029 | this->merge_processor_specific_flags(dynobj->name(), in_flags, ei_class, | |
8030 | true); | |
8031 | } | |
8032 | ||
8033 | // Merge .reginfo contents of input objects. | |
8034 | Valtype gprmask = 0; | |
8035 | Valtype cprmask1 = 0; | |
8036 | Valtype cprmask2 = 0; | |
8037 | Valtype cprmask3 = 0; | |
8038 | Valtype cprmask4 = 0; | |
8039 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
8040 | p != input_objects->relobj_end(); | |
8041 | ++p) | |
8042 | { | |
8043 | Mips_relobj<size, big_endian>* relobj = | |
8044 | Mips_relobj<size, big_endian>::as_mips_relobj(*p); | |
8045 | ||
8046 | gprmask |= relobj->gprmask(); | |
8047 | cprmask1 |= relobj->cprmask1(); | |
8048 | cprmask2 |= relobj->cprmask2(); | |
8049 | cprmask3 |= relobj->cprmask3(); | |
8050 | cprmask4 |= relobj->cprmask4(); | |
8051 | } | |
8052 | ||
8053 | if (this->plt_ != NULL) | |
8054 | { | |
8055 | // Set final PLT offsets for symbols. | |
8056 | this->plt_section()->set_plt_offsets(); | |
8057 | ||
8058 | // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section. | |
8059 | // Set STO_MICROMIPS flag if the output has microMIPS code, but only if | |
8060 | // there are no standard PLT entries present. | |
8061 | unsigned char nonvis = 0; | |
8062 | if (this->is_output_micromips() | |
8063 | && !this->plt_section()->has_standard_entries()) | |
8064 | nonvis = elfcpp::STO_MICROMIPS >> 2; | |
8065 | symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL, | |
8066 | Symbol_table::PREDEFINED, | |
8067 | this->plt_, | |
8068 | 0, 0, elfcpp::STT_FUNC, | |
8069 | elfcpp::STB_LOCAL, | |
8070 | elfcpp::STV_DEFAULT, nonvis, | |
8071 | false, false); | |
8072 | } | |
8073 | ||
8074 | if (this->mips_stubs_ != NULL) | |
8075 | { | |
8076 | // Define _MIPS_STUBS_ at the start of the .MIPS.stubs section. | |
8077 | unsigned char nonvis = 0; | |
8078 | if (this->is_output_micromips()) | |
8079 | nonvis = elfcpp::STO_MICROMIPS >> 2; | |
8080 | symtab->define_in_output_data("_MIPS_STUBS_", NULL, | |
8081 | Symbol_table::PREDEFINED, | |
8082 | this->mips_stubs_, | |
8083 | 0, 0, elfcpp::STT_FUNC, | |
8084 | elfcpp::STB_LOCAL, | |
8085 | elfcpp::STV_DEFAULT, nonvis, | |
8086 | false, false); | |
8087 | } | |
8088 | ||
8089 | if (!parameters->options().relocatable() && !parameters->doing_static_link()) | |
8090 | // In case there is no .got section, create one. | |
8091 | this->got_section(symtab, layout); | |
8092 | ||
8093 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
8094 | // relocs. | |
8095 | if (this->copy_relocs_.any_saved_relocs()) | |
8096 | this->copy_relocs_.emit_mips(this->rel_dyn_section(layout), symtab, layout, | |
8097 | this); | |
8098 | ||
8099 | // Emit dynamic relocs. | |
8100 | for (typename std::vector<Dyn_reloc>::iterator p = this->dyn_relocs_.begin(); | |
8101 | p != this->dyn_relocs_.end(); | |
8102 | ++p) | |
8103 | p->emit(this->rel_dyn_section(layout), this->got_section(), symtab); | |
8104 | ||
8105 | if (this->has_got_section()) | |
8106 | this->got_section()->lay_out_got(layout, symtab, input_objects); | |
8107 | ||
8108 | if (this->mips_stubs_ != NULL) | |
8109 | this->mips_stubs_->set_needs_dynsym_value(); | |
8110 | ||
8111 | // Check for functions that might need $25 to be valid on entry. | |
8112 | // TODO(sasa): Can we do this without iterating over all symbols? | |
8113 | typedef Symbol_visitor_check_symbols<size, big_endian> Symbol_visitor; | |
8114 | symtab->for_all_symbols<size, Symbol_visitor>(Symbol_visitor(this, layout, | |
8115 | symtab)); | |
8116 | ||
8117 | // Add NULL segment. | |
8118 | if (!parameters->options().relocatable()) | |
8119 | layout->make_output_segment(elfcpp::PT_NULL, 0); | |
8120 | ||
8121 | for (Layout::Section_list::const_iterator p = layout->section_list().begin(); | |
8122 | p != layout->section_list().end(); | |
8123 | ++p) | |
8124 | { | |
8125 | if ((*p)->type() == elfcpp::SHT_MIPS_REGINFO) | |
8126 | { | |
8127 | Mips_output_section_reginfo<size, big_endian>* reginfo = | |
8128 | Mips_output_section_reginfo<size, big_endian>:: | |
8129 | as_mips_output_section_reginfo(*p); | |
8130 | ||
8131 | reginfo->set_masks(gprmask, cprmask1, cprmask2, cprmask3, cprmask4); | |
8132 | ||
8133 | if (!parameters->options().relocatable()) | |
8134 | { | |
8135 | Output_segment* reginfo_segment = | |
8136 | layout->make_output_segment(elfcpp::PT_MIPS_REGINFO, | |
8137 | elfcpp::PF_R); | |
8138 | reginfo_segment->add_output_section_to_nonload(reginfo, | |
8139 | elfcpp::PF_R); | |
8140 | } | |
8141 | } | |
8142 | } | |
8143 | ||
8144 | // Fill in some more dynamic tags. | |
8145 | // TODO(sasa): Add more dynamic tags. | |
8146 | const Reloc_section* rel_plt = (this->plt_ == NULL | |
8147 | ? NULL : this->plt_->rel_plt()); | |
8148 | layout->add_target_dynamic_tags(true, this->got_, rel_plt, | |
8149 | this->rel_dyn_, true, false); | |
8150 | ||
8151 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
8152 | if (odyn != NULL | |
8153 | && !parameters->options().relocatable() | |
8154 | && !parameters->doing_static_link()) | |
8155 | { | |
8156 | unsigned int d_val; | |
8157 | // This element holds a 32-bit version id for the Runtime | |
8158 | // Linker Interface. This will start at integer value 1. | |
8159 | d_val = 0x01; | |
8160 | odyn->add_constant(elfcpp::DT_MIPS_RLD_VERSION, d_val); | |
8161 | ||
8162 | // Dynamic flags | |
8163 | d_val = elfcpp::RHF_NOTPOT; | |
8164 | odyn->add_constant(elfcpp::DT_MIPS_FLAGS, d_val); | |
8165 | ||
8166 | // Save layout for using when emiting custom dynamic tags. | |
8167 | this->layout_ = layout; | |
8168 | ||
8169 | // This member holds the base address of the segment. | |
8170 | odyn->add_custom(elfcpp::DT_MIPS_BASE_ADDRESS); | |
8171 | ||
8172 | // This member holds the number of entries in the .dynsym section. | |
8173 | odyn->add_custom(elfcpp::DT_MIPS_SYMTABNO); | |
8174 | ||
8175 | // This member holds the index of the first dynamic symbol | |
8176 | // table entry that corresponds to an entry in the global offset table. | |
8177 | odyn->add_custom(elfcpp::DT_MIPS_GOTSYM); | |
8178 | ||
8179 | // This member holds the number of local GOT entries. | |
8180 | odyn->add_constant(elfcpp::DT_MIPS_LOCAL_GOTNO, | |
8181 | this->got_->get_local_gotno()); | |
8182 | ||
8183 | if (this->plt_ != NULL) | |
8184 | // DT_MIPS_PLTGOT dynamic tag | |
8185 | odyn->add_section_address(elfcpp::DT_MIPS_PLTGOT, this->got_plt_); | |
8186 | } | |
8187 | } | |
8188 | ||
8189 | // Get the custom dynamic tag value. | |
8190 | template<int size, bool big_endian> | |
8191 | unsigned int | |
8192 | Target_mips<size, big_endian>::do_dynamic_tag_custom_value(elfcpp::DT tag) const | |
8193 | { | |
8194 | switch (tag) | |
8195 | { | |
8196 | case elfcpp::DT_MIPS_BASE_ADDRESS: | |
8197 | { | |
8198 | // The base address of the segment. | |
8199 | // At this point, the segment list has been sorted into final order, | |
8200 | // so just return vaddr of the first readable PT_LOAD segment. | |
8201 | Output_segment* seg = | |
8202 | this->layout_->find_output_segment(elfcpp::PT_LOAD, elfcpp::PF_R, 0); | |
8203 | gold_assert(seg != NULL); | |
8204 | return seg->vaddr(); | |
8205 | } | |
8206 | ||
8207 | case elfcpp::DT_MIPS_SYMTABNO: | |
8208 | // The number of entries in the .dynsym section. | |
8209 | return this->get_dt_mips_symtabno(); | |
8210 | ||
8211 | case elfcpp::DT_MIPS_GOTSYM: | |
8212 | { | |
8213 | // The index of the first dynamic symbol table entry that corresponds | |
8214 | // to an entry in the GOT. | |
8215 | if (this->got_->first_global_got_dynsym_index() != -1U) | |
8216 | return this->got_->first_global_got_dynsym_index(); | |
8217 | else | |
8218 | // In case if we don't have global GOT symbols we default to setting | |
8219 | // DT_MIPS_GOTSYM to the same value as DT_MIPS_SYMTABNO. | |
8220 | return this->get_dt_mips_symtabno(); | |
8221 | } | |
8222 | ||
8223 | default: | |
8224 | gold_error(_("Unknown dynamic tag 0x%x"), (unsigned int)tag); | |
8225 | } | |
8226 | ||
8227 | return (unsigned int)-1; | |
8228 | } | |
8229 | ||
8230 | // Relocate section data. | |
8231 | ||
8232 | template<int size, bool big_endian> | |
8233 | void | |
8234 | Target_mips<size, big_endian>::relocate_section( | |
8235 | const Relocate_info<size, big_endian>* relinfo, | |
8236 | unsigned int sh_type, | |
8237 | const unsigned char* prelocs, | |
8238 | size_t reloc_count, | |
8239 | Output_section* output_section, | |
8240 | bool needs_special_offset_handling, | |
8241 | unsigned char* view, | |
8242 | Mips_address address, | |
8243 | section_size_type view_size, | |
8244 | const Reloc_symbol_changes* reloc_symbol_changes) | |
8245 | { | |
8246 | typedef Target_mips<size, big_endian> Mips; | |
8247 | typedef typename Target_mips<size, big_endian>::Relocate Mips_relocate; | |
8248 | ||
8249 | if (sh_type == elfcpp::SHT_REL) | |
8250 | gold::relocate_section<size, big_endian, Mips, elfcpp::SHT_REL, | |
8251 | Mips_relocate, gold::Default_comdat_behavior>( | |
8252 | relinfo, | |
8253 | this, | |
8254 | prelocs, | |
8255 | reloc_count, | |
8256 | output_section, | |
8257 | needs_special_offset_handling, | |
8258 | view, | |
8259 | address, | |
8260 | view_size, | |
8261 | reloc_symbol_changes); | |
8262 | else if (sh_type == elfcpp::SHT_RELA) | |
8263 | gold::relocate_section<size, big_endian, Mips, elfcpp::SHT_RELA, | |
8264 | Mips_relocate, gold::Default_comdat_behavior>( | |
8265 | relinfo, | |
8266 | this, | |
8267 | prelocs, | |
8268 | reloc_count, | |
8269 | output_section, | |
8270 | needs_special_offset_handling, | |
8271 | view, | |
8272 | address, | |
8273 | view_size, | |
8274 | reloc_symbol_changes); | |
8275 | } | |
8276 | ||
8277 | // Return the size of a relocation while scanning during a relocatable | |
8278 | // link. | |
8279 | ||
8280 | template<int size, bool big_endian> | |
8281 | unsigned int | |
8282 | Target_mips<size, big_endian>::Relocatable_size_for_reloc::get_size_for_reloc( | |
8283 | unsigned int r_type, | |
8284 | Relobj* object) | |
8285 | { | |
8286 | switch (r_type) | |
8287 | { | |
8288 | case elfcpp::R_MIPS_NONE: | |
8289 | case elfcpp::R_MIPS_TLS_DTPMOD64: | |
8290 | case elfcpp::R_MIPS_TLS_DTPREL64: | |
8291 | case elfcpp::R_MIPS_TLS_TPREL64: | |
8292 | return 0; | |
8293 | ||
8294 | case elfcpp::R_MIPS_32: | |
8295 | case elfcpp::R_MIPS_TLS_DTPMOD32: | |
8296 | case elfcpp::R_MIPS_TLS_DTPREL32: | |
8297 | case elfcpp::R_MIPS_TLS_TPREL32: | |
8298 | case elfcpp::R_MIPS_REL32: | |
8299 | case elfcpp::R_MIPS_PC32: | |
8300 | case elfcpp::R_MIPS_GPREL32: | |
8301 | case elfcpp::R_MIPS_JALR: | |
8302 | return 4; | |
8303 | ||
8304 | case elfcpp::R_MIPS_16: | |
8305 | case elfcpp::R_MIPS_HI16: | |
8306 | case elfcpp::R_MIPS_LO16: | |
8307 | case elfcpp::R_MIPS_GPREL16: | |
8308 | case elfcpp::R_MIPS16_HI16: | |
8309 | case elfcpp::R_MIPS16_LO16: | |
8310 | case elfcpp::R_MIPS_PC16: | |
8311 | case elfcpp::R_MIPS_GOT16: | |
8312 | case elfcpp::R_MIPS16_GOT16: | |
8313 | case elfcpp::R_MIPS_CALL16: | |
8314 | case elfcpp::R_MIPS16_CALL16: | |
8315 | case elfcpp::R_MIPS_GOT_HI16: | |
8316 | case elfcpp::R_MIPS_CALL_HI16: | |
8317 | case elfcpp::R_MIPS_GOT_LO16: | |
8318 | case elfcpp::R_MIPS_CALL_LO16: | |
8319 | case elfcpp::R_MIPS_TLS_DTPREL_HI16: | |
8320 | case elfcpp::R_MIPS_TLS_DTPREL_LO16: | |
8321 | case elfcpp::R_MIPS_TLS_TPREL_HI16: | |
8322 | case elfcpp::R_MIPS_TLS_TPREL_LO16: | |
8323 | case elfcpp::R_MIPS16_GPREL: | |
8324 | case elfcpp::R_MIPS_GOT_DISP: | |
8325 | case elfcpp::R_MIPS_LITERAL: | |
8326 | case elfcpp::R_MIPS_GOT_PAGE: | |
8327 | case elfcpp::R_MIPS_GOT_OFST: | |
8328 | case elfcpp::R_MIPS_TLS_GD: | |
8329 | case elfcpp::R_MIPS_TLS_LDM: | |
8330 | case elfcpp::R_MIPS_TLS_GOTTPREL: | |
8331 | return 2; | |
8332 | ||
8333 | // These relocations are not byte sized | |
8334 | case elfcpp::R_MIPS_26: | |
8335 | case elfcpp::R_MIPS16_26: | |
8336 | return 4; | |
8337 | ||
8338 | case elfcpp::R_MIPS_COPY: | |
8339 | case elfcpp::R_MIPS_JUMP_SLOT: | |
8340 | object->error(_("unexpected reloc %u in object file"), r_type); | |
8341 | return 0; | |
8342 | ||
8343 | default: | |
8344 | object->error(_("unsupported reloc %u in object file"), r_type); | |
8345 | return 0; | |
8346 | } | |
8347 | } | |
8348 | ||
8349 | // Scan the relocs during a relocatable link. | |
8350 | ||
8351 | template<int size, bool big_endian> | |
8352 | void | |
8353 | Target_mips<size, big_endian>::scan_relocatable_relocs( | |
8354 | Symbol_table* symtab, | |
8355 | Layout* layout, | |
8356 | Sized_relobj_file<size, big_endian>* object, | |
8357 | unsigned int data_shndx, | |
8358 | unsigned int sh_type, | |
8359 | const unsigned char* prelocs, | |
8360 | size_t reloc_count, | |
8361 | Output_section* output_section, | |
8362 | bool needs_special_offset_handling, | |
8363 | size_t local_symbol_count, | |
8364 | const unsigned char* plocal_symbols, | |
8365 | Relocatable_relocs* rr) | |
8366 | { | |
8367 | gold_assert(sh_type == elfcpp::SHT_REL); | |
8368 | ||
8369 | typedef Mips_scan_relocatable_relocs<big_endian, elfcpp::SHT_REL, | |
8370 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
8371 | ||
8372 | gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_REL, | |
8373 | Scan_relocatable_relocs>( | |
8374 | symtab, | |
8375 | layout, | |
8376 | object, | |
8377 | data_shndx, | |
8378 | prelocs, | |
8379 | reloc_count, | |
8380 | output_section, | |
8381 | needs_special_offset_handling, | |
8382 | local_symbol_count, | |
8383 | plocal_symbols, | |
8384 | rr); | |
8385 | } | |
8386 | ||
8387 | // Emit relocations for a section. | |
8388 | ||
8389 | template<int size, bool big_endian> | |
8390 | void | |
8391 | Target_mips<size, big_endian>::relocate_relocs( | |
8392 | const Relocate_info<size, big_endian>* relinfo, | |
8393 | unsigned int sh_type, | |
8394 | const unsigned char* prelocs, | |
8395 | size_t reloc_count, | |
8396 | Output_section* output_section, | |
8397 | typename elfcpp::Elf_types<size>::Elf_Off | |
8398 | offset_in_output_section, | |
8399 | const Relocatable_relocs* rr, | |
8400 | unsigned char* view, | |
8401 | Mips_address view_address, | |
8402 | section_size_type view_size, | |
8403 | unsigned char* reloc_view, | |
8404 | section_size_type reloc_view_size) | |
8405 | { | |
8406 | gold_assert(sh_type == elfcpp::SHT_REL); | |
8407 | ||
8408 | gold::relocate_relocs<size, big_endian, elfcpp::SHT_REL>( | |
8409 | relinfo, | |
8410 | prelocs, | |
8411 | reloc_count, | |
8412 | output_section, | |
8413 | offset_in_output_section, | |
8414 | rr, | |
8415 | view, | |
8416 | view_address, | |
8417 | view_size, | |
8418 | reloc_view, | |
8419 | reloc_view_size); | |
8420 | } | |
8421 | ||
8422 | // Perform target-specific processing in a relocatable link. This is | |
8423 | // only used if we use the relocation strategy RELOC_SPECIAL. | |
8424 | ||
8425 | template<int size, bool big_endian> | |
8426 | void | |
8427 | Target_mips<size, big_endian>::relocate_special_relocatable( | |
8428 | const Relocate_info<size, big_endian>* relinfo, | |
8429 | unsigned int sh_type, | |
8430 | const unsigned char* preloc_in, | |
8431 | size_t relnum, | |
8432 | Output_section* output_section, | |
8433 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, | |
8434 | unsigned char* view, | |
8435 | Mips_address view_address, | |
8436 | section_size_type, | |
8437 | unsigned char* preloc_out) | |
8438 | { | |
8439 | // We can only handle REL type relocation sections. | |
8440 | gold_assert(sh_type == elfcpp::SHT_REL); | |
8441 | ||
8442 | typedef typename Reloc_types<elfcpp::SHT_REL, size, big_endian>::Reloc | |
8443 | Reltype; | |
8444 | typedef typename Reloc_types<elfcpp::SHT_REL, size, big_endian>::Reloc_write | |
8445 | Reltype_write; | |
8446 | ||
8447 | typedef Mips_relocate_functions<size, big_endian> Reloc_funcs; | |
8448 | ||
8449 | const Mips_address invalid_address = static_cast<Mips_address>(0) - 1; | |
8450 | ||
8451 | Mips_relobj<size, big_endian>* object = | |
8452 | Mips_relobj<size, big_endian>::as_mips_relobj(relinfo->object); | |
8453 | const unsigned int local_count = object->local_symbol_count(); | |
8454 | ||
8455 | Reltype reloc(preloc_in); | |
8456 | Reltype_write reloc_write(preloc_out); | |
8457 | ||
8458 | elfcpp::Elf_types<32>::Elf_WXword r_info = reloc.get_r_info(); | |
8459 | const unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
8460 | const unsigned int r_type = elfcpp::elf_r_type<size>(r_info); | |
8461 | ||
8462 | // Get the new symbol index. | |
8463 | // We only use RELOC_SPECIAL strategy in local relocations. | |
8464 | gold_assert(r_sym < local_count); | |
8465 | ||
8466 | // We are adjusting a section symbol. We need to find | |
8467 | // the symbol table index of the section symbol for | |
8468 | // the output section corresponding to input section | |
8469 | // in which this symbol is defined. | |
8470 | bool is_ordinary; | |
8471 | unsigned int shndx = object->local_symbol_input_shndx(r_sym, &is_ordinary); | |
8472 | gold_assert(is_ordinary); | |
8473 | Output_section* os = object->output_section(shndx); | |
8474 | gold_assert(os != NULL); | |
8475 | gold_assert(os->needs_symtab_index()); | |
8476 | unsigned int new_symndx = os->symtab_index(); | |
8477 | ||
8478 | // Get the new offset--the location in the output section where | |
8479 | // this relocation should be applied. | |
8480 | ||
8481 | Mips_address offset = reloc.get_r_offset(); | |
8482 | Mips_address new_offset; | |
8483 | if (offset_in_output_section != invalid_address) | |
8484 | new_offset = offset + offset_in_output_section; | |
8485 | else | |
8486 | { | |
8487 | section_offset_type sot_offset = | |
8488 | convert_types<section_offset_type, Mips_address>(offset); | |
8489 | section_offset_type new_sot_offset = | |
8490 | output_section->output_offset(object, relinfo->data_shndx, | |
8491 | sot_offset); | |
8492 | gold_assert(new_sot_offset != -1); | |
8493 | new_offset = new_sot_offset; | |
8494 | } | |
8495 | ||
8496 | // In an object file, r_offset is an offset within the section. | |
8497 | // In an executable or dynamic object, generated by | |
8498 | // --emit-relocs, r_offset is an absolute address. | |
8499 | if (!parameters->options().relocatable()) | |
8500 | { | |
8501 | new_offset += view_address; | |
8502 | if (offset_in_output_section != invalid_address) | |
8503 | new_offset -= offset_in_output_section; | |
8504 | } | |
8505 | ||
8506 | reloc_write.put_r_offset(new_offset); | |
8507 | reloc_write.put_r_info(elfcpp::elf_r_info<32>(new_symndx, r_type)); | |
8508 | ||
8509 | // Handle the reloc addend. | |
8510 | // The relocation uses a section symbol in the input file. | |
8511 | // We are adjusting it to use a section symbol in the output | |
8512 | // file. The input section symbol refers to some address in | |
8513 | // the input section. We need the relocation in the output | |
8514 | // file to refer to that same address. This adjustment to | |
8515 | // the addend is the same calculation we use for a simple | |
8516 | // absolute relocation for the input section symbol. | |
8517 | ||
8518 | const Symbol_value<size>* psymval = object->local_symbol(r_sym); | |
8519 | ||
8520 | unsigned char* paddend = view + offset; | |
8521 | typename Reloc_funcs::Status reloc_status = Reloc_funcs::STATUS_OKAY; | |
8522 | switch (r_type) | |
8523 | { | |
8524 | case elfcpp::R_MIPS_26: | |
8525 | reloc_status = Reloc_funcs::rel26(paddend, object, psymval, | |
8526 | offset_in_output_section, true, 0, sh_type == elfcpp::SHT_REL, NULL, | |
8527 | false /*TODO(sasa): cross mode jump*/, r_type, this->jal_to_bal()); | |
8528 | break; | |
8529 | ||
8530 | default: | |
8531 | gold_unreachable(); | |
8532 | } | |
8533 | ||
8534 | // Report any errors. | |
8535 | switch (reloc_status) | |
8536 | { | |
8537 | case Reloc_funcs::STATUS_OKAY: | |
8538 | break; | |
8539 | case Reloc_funcs::STATUS_OVERFLOW: | |
8540 | gold_error_at_location(relinfo, relnum, reloc.get_r_offset(), | |
8541 | _("relocation overflow")); | |
8542 | break; | |
8543 | case Reloc_funcs::STATUS_BAD_RELOC: | |
8544 | gold_error_at_location(relinfo, relnum, reloc.get_r_offset(), | |
8545 | _("unexpected opcode while processing relocation")); | |
8546 | break; | |
8547 | default: | |
8548 | gold_unreachable(); | |
8549 | } | |
8550 | } | |
8551 | ||
8552 | // Optimize the TLS relocation type based on what we know about the | |
8553 | // symbol. IS_FINAL is true if the final address of this symbol is | |
8554 | // known at link time. | |
8555 | ||
8556 | template<int size, bool big_endian> | |
8557 | tls::Tls_optimization | |
8558 | Target_mips<size, big_endian>::optimize_tls_reloc(bool, int) | |
8559 | { | |
8560 | // FIXME: Currently we do not do any TLS optimization. | |
8561 | return tls::TLSOPT_NONE; | |
8562 | } | |
8563 | ||
8564 | // Scan a relocation for a local symbol. | |
8565 | ||
8566 | template<int size, bool big_endian> | |
8567 | inline void | |
8568 | Target_mips<size, big_endian>::Scan::local( | |
8569 | Symbol_table* symtab, | |
8570 | Layout* layout, | |
8571 | Target_mips<size, big_endian>* target, | |
8572 | Sized_relobj_file<size, big_endian>* object, | |
8573 | unsigned int data_shndx, | |
8574 | Output_section* output_section, | |
8575 | const elfcpp::Rela<size, big_endian>* rela, | |
8576 | const elfcpp::Rel<size, big_endian>* rel, | |
8577 | unsigned int rel_type, | |
8578 | unsigned int r_type, | |
8579 | const elfcpp::Sym<size, big_endian>& lsym, | |
8580 | bool is_discarded) | |
8581 | { | |
8582 | if (is_discarded) | |
8583 | return; | |
8584 | ||
8585 | Mips_address r_offset; | |
8586 | typename elfcpp::Elf_types<size>::Elf_WXword r_info; | |
8587 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend; | |
8588 | ||
8589 | if (rel_type == elfcpp::SHT_RELA) | |
8590 | { | |
8591 | r_offset = rela->get_r_offset(); | |
8592 | r_info = rela->get_r_info(); | |
8593 | r_addend = rela->get_r_addend(); | |
8594 | } | |
8595 | else | |
8596 | { | |
8597 | r_offset = rel->get_r_offset(); | |
8598 | r_info = rel->get_r_info(); | |
8599 | r_addend = 0; | |
8600 | } | |
8601 | ||
8602 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
8603 | Mips_relobj<size, big_endian>* mips_obj = | |
8604 | Mips_relobj<size, big_endian>::as_mips_relobj(object); | |
8605 | ||
8606 | if (mips_obj->is_mips16_stub_section(data_shndx)) | |
8607 | { | |
8608 | mips_obj->get_mips16_stub_section(data_shndx) | |
8609 | ->new_local_reloc_found(r_type, r_sym); | |
8610 | } | |
8611 | ||
8612 | if (r_type == elfcpp::R_MIPS_NONE) | |
8613 | // R_MIPS_NONE is used in mips16 stub sections, to define the target of the | |
8614 | // mips16 stub. | |
8615 | return; | |
8616 | ||
8617 | if (!mips16_call_reloc(r_type) | |
8618 | && !mips_obj->section_allows_mips16_refs(data_shndx)) | |
8619 | // This reloc would need to refer to a MIPS16 hard-float stub, if | |
8620 | // there is one. We ignore MIPS16 stub sections and .pdr section when | |
8621 | // looking for relocs that would need to refer to MIPS16 stubs. | |
8622 | mips_obj->add_local_non_16bit_call(r_sym); | |
8623 | ||
8624 | if (r_type == elfcpp::R_MIPS16_26 | |
8625 | && !mips_obj->section_allows_mips16_refs(data_shndx)) | |
8626 | mips_obj->add_local_16bit_call(r_sym); | |
8627 | ||
8628 | switch (r_type) | |
8629 | { | |
8630 | case elfcpp::R_MIPS_GOT16: | |
8631 | case elfcpp::R_MIPS_CALL16: | |
8632 | case elfcpp::R_MIPS_CALL_HI16: | |
8633 | case elfcpp::R_MIPS_CALL_LO16: | |
8634 | case elfcpp::R_MIPS_GOT_HI16: | |
8635 | case elfcpp::R_MIPS_GOT_LO16: | |
8636 | case elfcpp::R_MIPS_GOT_PAGE: | |
8637 | case elfcpp::R_MIPS_GOT_OFST: | |
8638 | case elfcpp::R_MIPS_GOT_DISP: | |
8639 | case elfcpp::R_MIPS_TLS_GOTTPREL: | |
8640 | case elfcpp::R_MIPS_TLS_GD: | |
8641 | case elfcpp::R_MIPS_TLS_LDM: | |
8642 | case elfcpp::R_MIPS16_GOT16: | |
8643 | case elfcpp::R_MIPS16_CALL16: | |
8644 | case elfcpp::R_MIPS16_TLS_GOTTPREL: | |
8645 | case elfcpp::R_MIPS16_TLS_GD: | |
8646 | case elfcpp::R_MIPS16_TLS_LDM: | |
8647 | case elfcpp::R_MICROMIPS_GOT16: | |
8648 | case elfcpp::R_MICROMIPS_CALL16: | |
8649 | case elfcpp::R_MICROMIPS_CALL_HI16: | |
8650 | case elfcpp::R_MICROMIPS_CALL_LO16: | |
8651 | case elfcpp::R_MICROMIPS_GOT_HI16: | |
8652 | case elfcpp::R_MICROMIPS_GOT_LO16: | |
8653 | case elfcpp::R_MICROMIPS_GOT_PAGE: | |
8654 | case elfcpp::R_MICROMIPS_GOT_OFST: | |
8655 | case elfcpp::R_MICROMIPS_GOT_DISP: | |
8656 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: | |
8657 | case elfcpp::R_MICROMIPS_TLS_GD: | |
8658 | case elfcpp::R_MICROMIPS_TLS_LDM: | |
8659 | // We need a GOT section. | |
8660 | target->got_section(symtab, layout); | |
8661 | break; | |
8662 | ||
8663 | default: | |
8664 | break; | |
8665 | } | |
8666 | ||
8667 | if (call_lo16_reloc(r_type) | |
8668 | || got_lo16_reloc(r_type) | |
8669 | || got_disp_reloc(r_type)) | |
8670 | { | |
8671 | // We may need a local GOT entry for this relocation. We | |
8672 | // don't count R_MIPS_GOT_PAGE because we can estimate the | |
8673 | // maximum number of pages needed by looking at the size of | |
8674 | // the segment. Similar comments apply to R_MIPS*_GOT16 and | |
8675 | // R_MIPS*_CALL16. We don't count R_MIPS_GOT_HI16, or | |
8676 | // R_MIPS_CALL_HI16 because these are always followed by an | |
8677 | // R_MIPS_GOT_LO16 or R_MIPS_CALL_LO16. | |
8678 | Mips_output_data_got<size, big_endian>* got = | |
8679 | target->got_section(symtab, layout); | |
8680 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
8681 | got->record_local_got_symbol(mips_obj, r_sym, r_addend, r_type, -1U); | |
8682 | } | |
8683 | ||
8684 | switch (r_type) | |
8685 | { | |
8686 | case elfcpp::R_MIPS_CALL16: | |
8687 | case elfcpp::R_MIPS16_CALL16: | |
8688 | case elfcpp::R_MICROMIPS_CALL16: | |
8689 | gold_error(_("CALL16 reloc at 0x%lx not against global symbol "), | |
8690 | (unsigned long)r_offset); | |
8691 | return; | |
8692 | ||
8693 | case elfcpp::R_MIPS_GOT_PAGE: | |
8694 | case elfcpp::R_MICROMIPS_GOT_PAGE: | |
8695 | case elfcpp::R_MIPS16_GOT16: | |
8696 | case elfcpp::R_MIPS_GOT16: | |
8697 | case elfcpp::R_MIPS_GOT_HI16: | |
8698 | case elfcpp::R_MIPS_GOT_LO16: | |
8699 | case elfcpp::R_MICROMIPS_GOT16: | |
8700 | case elfcpp::R_MICROMIPS_GOT_HI16: | |
8701 | case elfcpp::R_MICROMIPS_GOT_LO16: | |
8702 | { | |
8703 | // This relocation needs a page entry in the GOT. | |
8704 | // Get the section contents. | |
8705 | section_size_type view_size = 0; | |
8706 | const unsigned char* view = object->section_contents(data_shndx, | |
8707 | &view_size, false); | |
8708 | view += r_offset; | |
8709 | ||
8710 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); | |
8711 | Valtype32 addend = (rel_type == elfcpp::SHT_REL ? val & 0xffff | |
8712 | : r_addend); | |
8713 | ||
8714 | if (rel_type == elfcpp::SHT_REL && got16_reloc(r_type)) | |
8715 | target->got16_addends_.push_back(got16_addend<size, big_endian>( | |
8716 | object, data_shndx, r_type, r_sym, addend)); | |
8717 | else | |
8718 | target->got_section()->record_got_page_entry(mips_obj, r_sym, addend); | |
8719 | break; | |
8720 | } | |
8721 | ||
8722 | case elfcpp::R_MIPS_HI16: | |
8723 | case elfcpp::R_MIPS16_HI16: | |
8724 | case elfcpp::R_MICROMIPS_HI16: | |
8725 | // Record the reloc so that we can check whether the corresponding LO16 | |
8726 | // part exists. | |
8727 | if (rel_type == elfcpp::SHT_REL) | |
8728 | target->got16_addends_.push_back(got16_addend<size, big_endian>( | |
8729 | object, data_shndx, r_type, r_sym, 0)); | |
8730 | break; | |
8731 | ||
8732 | case elfcpp::R_MIPS_LO16: | |
8733 | case elfcpp::R_MIPS16_LO16: | |
8734 | case elfcpp::R_MICROMIPS_LO16: | |
8735 | { | |
8736 | if (rel_type != elfcpp::SHT_REL) | |
8737 | break; | |
8738 | ||
8739 | // Find corresponding GOT16/HI16 relocation. | |
8740 | ||
8741 | // According to the MIPS ELF ABI, the R_MIPS_LO16 relocation must | |
8742 | // be immediately following. However, for the IRIX6 ABI, the next | |
8743 | // relocation may be a composed relocation consisting of several | |
8744 | // relocations for the same address. In that case, the R_MIPS_LO16 | |
8745 | // relocation may occur as one of these. We permit a similar | |
8746 | // extension in general, as that is useful for GCC. | |
8747 | ||
8748 | // In some cases GCC dead code elimination removes the LO16 but | |
8749 | // keeps the corresponding HI16. This is strictly speaking a | |
8750 | // violation of the ABI but not immediately harmful. | |
8751 | ||
8752 | typename std::list<got16_addend<size, big_endian> >::iterator it = | |
8753 | target->got16_addends_.begin(); | |
8754 | while (it != target->got16_addends_.end()) | |
8755 | { | |
8756 | got16_addend<size, big_endian> _got16_addend = *it; | |
8757 | ||
8758 | // TODO(sasa): Split got16_addends_ list into two lists - one for | |
8759 | // GOT16 relocs and the other for HI16 relocs. | |
8760 | ||
8761 | // Report an error if we find HI16 or GOT16 reloc from the | |
8762 | // previous section without the matching LO16 part. | |
8763 | if (_got16_addend.object != object | |
8764 | || _got16_addend.shndx != data_shndx) | |
8765 | { | |
8766 | gold_error("Can't find matching LO16 reloc"); | |
8767 | break; | |
8768 | } | |
8769 | ||
8770 | if (_got16_addend.r_sym != r_sym | |
8771 | || !is_matching_lo16_reloc(_got16_addend.r_type, r_type)) | |
8772 | { | |
8773 | ++it; | |
8774 | continue; | |
8775 | } | |
8776 | ||
8777 | // We found a matching HI16 or GOT16 reloc for this LO16 reloc. | |
8778 | // For GOT16, we need to calculate combined addend and record GOT page | |
8779 | // entry. | |
8780 | if (got16_reloc(_got16_addend.r_type)) | |
8781 | { | |
8782 | ||
8783 | section_size_type view_size = 0; | |
8784 | const unsigned char* view = object->section_contents(data_shndx, | |
8785 | &view_size, | |
8786 | false); | |
8787 | view += r_offset; | |
8788 | ||
8789 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); | |
8790 | int32_t addend = Bits<16>::sign_extend32(val & 0xffff); | |
8791 | ||
8792 | addend = (_got16_addend.addend << 16) + addend; | |
8793 | target->got_section()->record_got_page_entry(mips_obj, r_sym, | |
8794 | addend); | |
8795 | } | |
8796 | ||
8797 | it = target->got16_addends_.erase(it); | |
8798 | } | |
8799 | break; | |
8800 | } | |
8801 | } | |
8802 | ||
8803 | switch (r_type) | |
8804 | { | |
8805 | case elfcpp::R_MIPS_32: | |
8806 | case elfcpp::R_MIPS_REL32: | |
8807 | case elfcpp::R_MIPS_64: | |
8808 | { | |
8809 | if (parameters->options().output_is_position_independent()) | |
8810 | { | |
8811 | // If building a shared library (or a position-independent | |
8812 | // executable), we need to create a dynamic relocation for | |
8813 | // this location. | |
8814 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
8815 | unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info); | |
8816 | rel_dyn->add_symbolless_local_addend(object, r_sym, | |
8817 | elfcpp::R_MIPS_REL32, | |
8818 | output_section, data_shndx, | |
8819 | r_offset); | |
8820 | } | |
8821 | break; | |
8822 | } | |
8823 | ||
8824 | case elfcpp::R_MIPS_TLS_GOTTPREL: | |
8825 | case elfcpp::R_MIPS16_TLS_GOTTPREL: | |
8826 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: | |
8827 | case elfcpp::R_MIPS_TLS_LDM: | |
8828 | case elfcpp::R_MIPS16_TLS_LDM: | |
8829 | case elfcpp::R_MICROMIPS_TLS_LDM: | |
8830 | case elfcpp::R_MIPS_TLS_GD: | |
8831 | case elfcpp::R_MIPS16_TLS_GD: | |
8832 | case elfcpp::R_MICROMIPS_TLS_GD: | |
8833 | { | |
8834 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
8835 | bool output_is_shared = parameters->options().shared(); | |
8836 | const tls::Tls_optimization optimized_type | |
8837 | = Target_mips<size, big_endian>::optimize_tls_reloc( | |
8838 | !output_is_shared, r_type); | |
8839 | switch (r_type) | |
8840 | { | |
8841 | case elfcpp::R_MIPS_TLS_GD: | |
8842 | case elfcpp::R_MIPS16_TLS_GD: | |
8843 | case elfcpp::R_MICROMIPS_TLS_GD: | |
8844 | if (optimized_type == tls::TLSOPT_NONE) | |
8845 | { | |
8846 | // Create a pair of GOT entries for the module index and | |
8847 | // dtv-relative offset. | |
8848 | Mips_output_data_got<size, big_endian>* got = | |
8849 | target->got_section(symtab, layout); | |
8850 | unsigned int shndx = lsym.get_st_shndx(); | |
8851 | bool is_ordinary; | |
8852 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
8853 | if (!is_ordinary) | |
8854 | { | |
8855 | object->error(_("local symbol %u has bad shndx %u"), | |
8856 | r_sym, shndx); | |
8857 | break; | |
8858 | } | |
8859 | got->record_local_got_symbol(mips_obj, r_sym, r_addend, r_type, | |
8860 | shndx); | |
8861 | } | |
8862 | else | |
8863 | { | |
8864 | // FIXME: TLS optimization not supported yet. | |
8865 | gold_unreachable(); | |
8866 | } | |
8867 | break; | |
8868 | ||
8869 | case elfcpp::R_MIPS_TLS_LDM: | |
8870 | case elfcpp::R_MIPS16_TLS_LDM: | |
8871 | case elfcpp::R_MICROMIPS_TLS_LDM: | |
8872 | if (optimized_type == tls::TLSOPT_NONE) | |
8873 | { | |
8874 | // We always record LDM symbols as local with index 0. | |
8875 | target->got_section()->record_local_got_symbol(mips_obj, 0, | |
8876 | r_addend, r_type, | |
8877 | -1U); | |
8878 | } | |
8879 | else | |
8880 | { | |
8881 | // FIXME: TLS optimization not supported yet. | |
8882 | gold_unreachable(); | |
8883 | } | |
8884 | break; | |
8885 | case elfcpp::R_MIPS_TLS_GOTTPREL: | |
8886 | case elfcpp::R_MIPS16_TLS_GOTTPREL: | |
8887 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: | |
8888 | layout->set_has_static_tls(); | |
8889 | if (optimized_type == tls::TLSOPT_NONE) | |
8890 | { | |
8891 | // Create a GOT entry for the tp-relative offset. | |
8892 | Mips_output_data_got<size, big_endian>* got = | |
8893 | target->got_section(symtab, layout); | |
8894 | got->record_local_got_symbol(mips_obj, r_sym, r_addend, r_type, | |
8895 | -1U); | |
8896 | } | |
8897 | else | |
8898 | { | |
8899 | // FIXME: TLS optimization not supported yet. | |
8900 | gold_unreachable(); | |
8901 | } | |
8902 | break; | |
8903 | ||
8904 | default: | |
8905 | gold_unreachable(); | |
8906 | } | |
8907 | } | |
8908 | break; | |
8909 | ||
8910 | default: | |
8911 | break; | |
8912 | } | |
8913 | ||
8914 | // Refuse some position-dependent relocations when creating a | |
8915 | // shared library. Do not refuse R_MIPS_32 / R_MIPS_64; they're | |
8916 | // not PIC, but we can create dynamic relocations and the result | |
8917 | // will be fine. Also do not refuse R_MIPS_LO16, which can be | |
8918 | // combined with R_MIPS_GOT16. | |
8919 | if (parameters->options().shared()) | |
8920 | { | |
8921 | switch (r_type) | |
8922 | { | |
8923 | case elfcpp::R_MIPS16_HI16: | |
8924 | case elfcpp::R_MIPS_HI16: | |
8925 | case elfcpp::R_MICROMIPS_HI16: | |
8926 | // Don't refuse a high part relocation if it's against | |
8927 | // no symbol (e.g. part of a compound relocation). | |
8928 | if (r_sym == 0) | |
8929 | break; | |
8930 | ||
8931 | // FALLTHROUGH | |
8932 | ||
8933 | case elfcpp::R_MIPS16_26: | |
8934 | case elfcpp::R_MIPS_26: | |
8935 | case elfcpp::R_MICROMIPS_26_S1: | |
8936 | gold_error(_("%s: relocation %u against `%s' can not be used when " | |
8937 | "making a shared object; recompile with -fPIC"), | |
8938 | object->name().c_str(), r_type, "a local symbol"); | |
8939 | default: | |
8940 | break; | |
8941 | } | |
8942 | } | |
8943 | } | |
8944 | ||
8945 | template<int size, bool big_endian> | |
8946 | inline void | |
8947 | Target_mips<size, big_endian>::Scan::local( | |
8948 | Symbol_table* symtab, | |
8949 | Layout* layout, | |
8950 | Target_mips<size, big_endian>* target, | |
8951 | Sized_relobj_file<size, big_endian>* object, | |
8952 | unsigned int data_shndx, | |
8953 | Output_section* output_section, | |
8954 | const elfcpp::Rel<size, big_endian>& reloc, | |
8955 | unsigned int r_type, | |
8956 | const elfcpp::Sym<size, big_endian>& lsym, | |
8957 | bool is_discarded) | |
8958 | { | |
8959 | if (is_discarded) | |
8960 | return; | |
8961 | ||
8962 | local( | |
8963 | symtab, | |
8964 | layout, | |
8965 | target, | |
8966 | object, | |
8967 | data_shndx, | |
8968 | output_section, | |
8969 | (const elfcpp::Rela<size, big_endian>*) NULL, | |
8970 | &reloc, | |
8971 | elfcpp::SHT_REL, | |
8972 | r_type, | |
8973 | lsym, is_discarded); | |
8974 | } | |
8975 | ||
8976 | ||
8977 | template<int size, bool big_endian> | |
8978 | inline void | |
8979 | Target_mips<size, big_endian>::Scan::local( | |
8980 | Symbol_table* symtab, | |
8981 | Layout* layout, | |
8982 | Target_mips<size, big_endian>* target, | |
8983 | Sized_relobj_file<size, big_endian>* object, | |
8984 | unsigned int data_shndx, | |
8985 | Output_section* output_section, | |
8986 | const elfcpp::Rela<size, big_endian>& reloc, | |
8987 | unsigned int r_type, | |
8988 | const elfcpp::Sym<size, big_endian>& lsym, | |
8989 | bool is_discarded) | |
8990 | { | |
8991 | if (is_discarded) | |
8992 | return; | |
8993 | ||
8994 | local( | |
8995 | symtab, | |
8996 | layout, | |
8997 | target, | |
8998 | object, | |
8999 | data_shndx, | |
9000 | output_section, | |
9001 | &reloc, | |
9002 | (const elfcpp::Rel<size, big_endian>*) NULL, | |
9003 | elfcpp::SHT_RELA, | |
9004 | r_type, | |
9005 | lsym, is_discarded); | |
9006 | } | |
9007 | ||
9008 | // Scan a relocation for a global symbol. | |
9009 | ||
9010 | template<int size, bool big_endian> | |
9011 | inline void | |
9012 | Target_mips<size, big_endian>::Scan::global( | |
9013 | Symbol_table* symtab, | |
9014 | Layout* layout, | |
9015 | Target_mips<size, big_endian>* target, | |
9016 | Sized_relobj_file<size, big_endian>* object, | |
9017 | unsigned int data_shndx, | |
9018 | Output_section* output_section, | |
9019 | const elfcpp::Rela<size, big_endian>* rela, | |
9020 | const elfcpp::Rel<size, big_endian>* rel, | |
9021 | unsigned int rel_type, | |
9022 | unsigned int r_type, | |
9023 | Symbol* gsym) | |
9024 | { | |
9025 | Mips_address r_offset; | |
9026 | typename elfcpp::Elf_types<size>::Elf_WXword r_info; | |
9027 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend; | |
9028 | ||
9029 | if (rel_type == elfcpp::SHT_RELA) | |
9030 | { | |
9031 | r_offset = rela->get_r_offset(); | |
9032 | r_info = rela->get_r_info(); | |
9033 | r_addend = rela->get_r_addend(); | |
9034 | } | |
9035 | else | |
9036 | { | |
9037 | r_offset = rel->get_r_offset(); | |
9038 | r_info = rel->get_r_info(); | |
9039 | r_addend = 0; | |
9040 | } | |
9041 | ||
9042 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
9043 | Mips_relobj<size, big_endian>* mips_obj = | |
9044 | Mips_relobj<size, big_endian>::as_mips_relobj(object); | |
9045 | Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(gsym); | |
9046 | ||
9047 | if (mips_obj->is_mips16_stub_section(data_shndx)) | |
9048 | { | |
9049 | mips_obj->get_mips16_stub_section(data_shndx) | |
9050 | ->new_global_reloc_found(r_type, mips_sym); | |
9051 | } | |
9052 | ||
9053 | if (r_type == elfcpp::R_MIPS_NONE) | |
9054 | // R_MIPS_NONE is used in mips16 stub sections, to define the target of the | |
9055 | // mips16 stub. | |
9056 | return; | |
9057 | ||
9058 | if (!mips16_call_reloc(r_type) | |
9059 | && !mips_obj->section_allows_mips16_refs(data_shndx)) | |
9060 | // This reloc would need to refer to a MIPS16 hard-float stub, if | |
9061 | // there is one. We ignore MIPS16 stub sections and .pdr section when | |
9062 | // looking for relocs that would need to refer to MIPS16 stubs. | |
9063 | mips_sym->set_need_fn_stub(); | |
9064 | ||
9065 | // A reference to _GLOBAL_OFFSET_TABLE_ implies that we need a got | |
9066 | // section. We check here to avoid creating a dynamic reloc against | |
9067 | // _GLOBAL_OFFSET_TABLE_. | |
9068 | if (!target->has_got_section() | |
9069 | && strcmp(gsym->name(), "_GLOBAL_OFFSET_TABLE_") == 0) | |
9070 | target->got_section(symtab, layout); | |
9071 | ||
9072 | // We need PLT entries if there are static-only relocations against | |
9073 | // an externally-defined function. This can technically occur for | |
9074 | // shared libraries if there are branches to the symbol, although it | |
9075 | // is unlikely that this will be used in practice due to the short | |
9076 | // ranges involved. It can occur for any relative or absolute relocation | |
9077 | // in executables; in that case, the PLT entry becomes the function's | |
9078 | // canonical address. | |
9079 | bool static_reloc = false; | |
9080 | ||
9081 | // Set CAN_MAKE_DYNAMIC to true if we can convert this | |
9082 | // relocation into a dynamic one. | |
9083 | bool can_make_dynamic = false; | |
9084 | switch (r_type) | |
9085 | { | |
9086 | case elfcpp::R_MIPS_GOT16: | |
9087 | case elfcpp::R_MIPS_CALL16: | |
9088 | case elfcpp::R_MIPS_CALL_HI16: | |
9089 | case elfcpp::R_MIPS_CALL_LO16: | |
9090 | case elfcpp::R_MIPS_GOT_HI16: | |
9091 | case elfcpp::R_MIPS_GOT_LO16: | |
9092 | case elfcpp::R_MIPS_GOT_PAGE: | |
9093 | case elfcpp::R_MIPS_GOT_OFST: | |
9094 | case elfcpp::R_MIPS_GOT_DISP: | |
9095 | case elfcpp::R_MIPS_TLS_GOTTPREL: | |
9096 | case elfcpp::R_MIPS_TLS_GD: | |
9097 | case elfcpp::R_MIPS_TLS_LDM: | |
9098 | case elfcpp::R_MIPS16_GOT16: | |
9099 | case elfcpp::R_MIPS16_CALL16: | |
9100 | case elfcpp::R_MIPS16_TLS_GOTTPREL: | |
9101 | case elfcpp::R_MIPS16_TLS_GD: | |
9102 | case elfcpp::R_MIPS16_TLS_LDM: | |
9103 | case elfcpp::R_MICROMIPS_GOT16: | |
9104 | case elfcpp::R_MICROMIPS_CALL16: | |
9105 | case elfcpp::R_MICROMIPS_CALL_HI16: | |
9106 | case elfcpp::R_MICROMIPS_CALL_LO16: | |
9107 | case elfcpp::R_MICROMIPS_GOT_HI16: | |
9108 | case elfcpp::R_MICROMIPS_GOT_LO16: | |
9109 | case elfcpp::R_MICROMIPS_GOT_PAGE: | |
9110 | case elfcpp::R_MICROMIPS_GOT_OFST: | |
9111 | case elfcpp::R_MICROMIPS_GOT_DISP: | |
9112 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: | |
9113 | case elfcpp::R_MICROMIPS_TLS_GD: | |
9114 | case elfcpp::R_MICROMIPS_TLS_LDM: | |
9115 | // We need a GOT section. | |
9116 | target->got_section(symtab, layout); | |
9117 | break; | |
9118 | ||
9119 | // This is just a hint; it can safely be ignored. Don't set | |
9120 | // has_static_relocs for the corresponding symbol. | |
9121 | case elfcpp::R_MIPS_JALR: | |
9122 | case elfcpp::R_MICROMIPS_JALR: | |
9123 | break; | |
9124 | ||
9125 | case elfcpp::R_MIPS_GPREL16: | |
9126 | case elfcpp::R_MIPS_GPREL32: | |
9127 | case elfcpp::R_MIPS16_GPREL: | |
9128 | case elfcpp::R_MICROMIPS_GPREL16: | |
9129 | // TODO(sasa) | |
9130 | // GP-relative relocations always resolve to a definition in a | |
9131 | // regular input file, ignoring the one-definition rule. This is | |
9132 | // important for the GP setup sequence in NewABI code, which | |
9133 | // always resolves to a local function even if other relocations | |
9134 | // against the symbol wouldn't. | |
9135 | //constrain_symbol_p = FALSE; | |
9136 | break; | |
9137 | ||
9138 | case elfcpp::R_MIPS_32: | |
9139 | case elfcpp::R_MIPS_REL32: | |
9140 | case elfcpp::R_MIPS_64: | |
9141 | if (parameters->options().shared() | |
9142 | || strcmp(gsym->name(), "__gnu_local_gp") != 0) | |
9143 | { | |
9144 | if (r_type != elfcpp::R_MIPS_REL32) | |
9145 | { | |
9146 | static_reloc = true; | |
9147 | mips_sym->set_pointer_equality_needed(); | |
9148 | } | |
9149 | can_make_dynamic = true; | |
9150 | break; | |
9151 | } | |
9152 | // Fall through. | |
9153 | ||
9154 | default: | |
9155 | // Most static relocations require pointer equality, except | |
9156 | // for branches. | |
9157 | mips_sym->set_pointer_equality_needed(); | |
9158 | ||
9159 | // Fall through. | |
9160 | ||
9161 | case elfcpp::R_MIPS_26: | |
9162 | case elfcpp::R_MIPS_PC16: | |
9163 | case elfcpp::R_MIPS16_26: | |
9164 | case elfcpp::R_MICROMIPS_26_S1: | |
9165 | case elfcpp::R_MICROMIPS_PC7_S1: | |
9166 | case elfcpp::R_MICROMIPS_PC10_S1: | |
9167 | case elfcpp::R_MICROMIPS_PC16_S1: | |
9168 | case elfcpp::R_MICROMIPS_PC23_S2: | |
9169 | static_reloc = true; | |
9170 | mips_sym->set_has_static_relocs(); | |
9171 | break; | |
9172 | } | |
9173 | ||
9174 | // If there are call relocations against an externally-defined symbol, | |
9175 | // see whether we can create a MIPS lazy-binding stub for it. We can | |
9176 | // only do this if all references to the function are through call | |
9177 | // relocations, and in that case, the traditional lazy-binding stubs | |
9178 | // are much more efficient than PLT entries. | |
9179 | switch (r_type) | |
9180 | { | |
9181 | case elfcpp::R_MIPS16_CALL16: | |
9182 | case elfcpp::R_MIPS_CALL16: | |
9183 | case elfcpp::R_MIPS_CALL_HI16: | |
9184 | case elfcpp::R_MIPS_CALL_LO16: | |
9185 | case elfcpp::R_MIPS_JALR: | |
9186 | case elfcpp::R_MICROMIPS_CALL16: | |
9187 | case elfcpp::R_MICROMIPS_CALL_HI16: | |
9188 | case elfcpp::R_MICROMIPS_CALL_LO16: | |
9189 | case elfcpp::R_MICROMIPS_JALR: | |
9190 | if (!mips_sym->no_lazy_stub()) | |
9191 | { | |
9192 | if ((mips_sym->needs_plt_entry() && mips_sym->is_from_dynobj()) | |
9193 | // Calls from shared objects to undefined symbols of type | |
9194 | // STT_NOTYPE need lazy-binding stub. | |
9195 | || (mips_sym->is_undefined() && parameters->options().shared())) | |
9196 | target->mips_stubs_section(layout)->make_entry(mips_sym); | |
9197 | } | |
9198 | break; | |
9199 | default: | |
9200 | { | |
9201 | // We must not create a stub for a symbol that has relocations | |
9202 | // related to taking the function's address. | |
9203 | mips_sym->set_no_lazy_stub(); | |
9204 | target->remove_lazy_stub_entry(mips_sym); | |
9205 | break; | |
9206 | } | |
9207 | } | |
9208 | ||
9209 | if (relocation_needs_la25_stub<size, big_endian>(mips_obj, r_type, | |
9210 | mips_sym->is_mips16())) | |
9211 | mips_sym->set_has_nonpic_branches(); | |
9212 | ||
9213 | // R_MIPS_HI16 against _gp_disp is used for $gp setup, | |
9214 | // and has a special meaning. | |
9215 | bool gp_disp_against_hi16 = (!mips_obj->is_newabi() | |
9216 | && strcmp(gsym->name(), "_gp_disp") == 0 | |
9217 | && (hi16_reloc(r_type) || lo16_reloc(r_type))); | |
9218 | if (static_reloc && gsym->needs_plt_entry()) | |
9219 | { | |
9220 | target->make_plt_entry(symtab, layout, mips_sym, r_type); | |
9221 | ||
9222 | // Since this is not a PC-relative relocation, we may be | |
9223 | // taking the address of a function. In that case we need to | |
9224 | // set the entry in the dynamic symbol table to the address of | |
9225 | // the PLT entry. | |
9226 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
9227 | { | |
9228 | gsym->set_needs_dynsym_value(); | |
9229 | // We distinguish between PLT entries and lazy-binding stubs by | |
9230 | // giving the former an st_other value of STO_MIPS_PLT. Set the | |
9231 | // flag if there are any relocations in the binary where pointer | |
9232 | // equality matters. | |
9233 | if (mips_sym->pointer_equality_needed()) | |
9234 | mips_sym->set_mips_plt(); | |
9235 | } | |
9236 | } | |
9237 | if ((static_reloc || can_make_dynamic) && !gp_disp_against_hi16) | |
9238 | { | |
9239 | // Absolute addressing relocations. | |
9240 | // Make a dynamic relocation if necessary. | |
9241 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
9242 | { | |
9243 | if (gsym->may_need_copy_reloc()) | |
9244 | { | |
9245 | target->copy_reloc(symtab, layout, object, | |
9246 | data_shndx, output_section, gsym, *rel); | |
9247 | } | |
9248 | else if (can_make_dynamic) | |
9249 | { | |
9250 | // Create .rel.dyn section. | |
9251 | target->rel_dyn_section(layout); | |
9252 | target->dynamic_reloc(mips_sym, elfcpp::R_MIPS_REL32, mips_obj, | |
9253 | data_shndx, output_section, r_offset); | |
9254 | } | |
9255 | else | |
9256 | gold_error(_("non-dynamic relocations refer to dynamic symbol %s"), | |
9257 | gsym->name()); | |
9258 | } | |
9259 | } | |
9260 | ||
9261 | bool for_call = false; | |
9262 | switch (r_type) | |
9263 | { | |
9264 | case elfcpp::R_MIPS_CALL16: | |
9265 | case elfcpp::R_MIPS16_CALL16: | |
9266 | case elfcpp::R_MICROMIPS_CALL16: | |
9267 | case elfcpp::R_MIPS_CALL_HI16: | |
9268 | case elfcpp::R_MIPS_CALL_LO16: | |
9269 | case elfcpp::R_MICROMIPS_CALL_HI16: | |
9270 | case elfcpp::R_MICROMIPS_CALL_LO16: | |
9271 | for_call = true; | |
9272 | // Fall through. | |
9273 | ||
9274 | case elfcpp::R_MIPS16_GOT16: | |
9275 | case elfcpp::R_MIPS_GOT16: | |
9276 | case elfcpp::R_MIPS_GOT_HI16: | |
9277 | case elfcpp::R_MIPS_GOT_LO16: | |
9278 | case elfcpp::R_MICROMIPS_GOT16: | |
9279 | case elfcpp::R_MICROMIPS_GOT_HI16: | |
9280 | case elfcpp::R_MICROMIPS_GOT_LO16: | |
9281 | case elfcpp::R_MIPS_GOT_DISP: | |
9282 | case elfcpp::R_MICROMIPS_GOT_DISP: | |
9283 | { | |
9284 | // The symbol requires a GOT entry. | |
9285 | Mips_output_data_got<size, big_endian>* got = | |
9286 | target->got_section(symtab, layout); | |
9287 | got->record_global_got_symbol(mips_sym, mips_obj, r_type, false, | |
9288 | for_call); | |
9289 | mips_sym->set_global_got_area(GGA_NORMAL); | |
9290 | } | |
9291 | break; | |
9292 | ||
9293 | case elfcpp::R_MIPS_GOT_PAGE: | |
9294 | case elfcpp::R_MICROMIPS_GOT_PAGE: | |
9295 | { | |
9296 | // This relocation needs a page entry in the GOT. | |
9297 | // Get the section contents. | |
9298 | section_size_type view_size = 0; | |
9299 | const unsigned char* view = | |
9300 | object->section_contents(data_shndx, &view_size, false); | |
9301 | view += r_offset; | |
9302 | ||
9303 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); | |
9304 | Valtype32 addend = (rel_type == elfcpp::SHT_REL ? val & 0xffff | |
9305 | : r_addend); | |
9306 | Mips_output_data_got<size, big_endian>* got = | |
9307 | target->got_section(symtab, layout); | |
9308 | got->record_got_page_entry(mips_obj, r_sym, addend); | |
9309 | ||
9310 | // If this is a global, overridable symbol, GOT_PAGE will | |
9311 | // decay to GOT_DISP, so we'll need a GOT entry for it. | |
9312 | bool def_regular = (mips_sym->source() == Symbol::FROM_OBJECT | |
9313 | && !mips_sym->object()->is_dynamic() | |
9314 | && !mips_sym->is_undefined()); | |
9315 | if (!def_regular | |
9316 | || (parameters->options().output_is_position_independent() | |
9317 | && !parameters->options().Bsymbolic() | |
9318 | && !mips_sym->is_forced_local())) | |
9319 | { | |
9320 | got->record_global_got_symbol(mips_sym, mips_obj, r_type, false, | |
9321 | for_call); | |
9322 | mips_sym->set_global_got_area(GGA_NORMAL); | |
9323 | } | |
9324 | } | |
9325 | break; | |
9326 | ||
9327 | case elfcpp::R_MIPS_TLS_GOTTPREL: | |
9328 | case elfcpp::R_MIPS16_TLS_GOTTPREL: | |
9329 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: | |
9330 | case elfcpp::R_MIPS_TLS_LDM: | |
9331 | case elfcpp::R_MIPS16_TLS_LDM: | |
9332 | case elfcpp::R_MICROMIPS_TLS_LDM: | |
9333 | case elfcpp::R_MIPS_TLS_GD: | |
9334 | case elfcpp::R_MIPS16_TLS_GD: | |
9335 | case elfcpp::R_MICROMIPS_TLS_GD: | |
9336 | { | |
9337 | const bool is_final = gsym->final_value_is_known(); | |
9338 | const tls::Tls_optimization optimized_type = | |
9339 | Target_mips<size, big_endian>::optimize_tls_reloc(is_final, r_type); | |
9340 | ||
9341 | switch (r_type) | |
9342 | { | |
9343 | case elfcpp::R_MIPS_TLS_GD: | |
9344 | case elfcpp::R_MIPS16_TLS_GD: | |
9345 | case elfcpp::R_MICROMIPS_TLS_GD: | |
9346 | if (optimized_type == tls::TLSOPT_NONE) | |
9347 | { | |
9348 | // Create a pair of GOT entries for the module index and | |
9349 | // dtv-relative offset. | |
9350 | Mips_output_data_got<size, big_endian>* got = | |
9351 | target->got_section(symtab, layout); | |
9352 | got->record_global_got_symbol(mips_sym, mips_obj, r_type, false, | |
9353 | false); | |
9354 | } | |
9355 | else | |
9356 | { | |
9357 | // FIXME: TLS optimization not supported yet. | |
9358 | gold_unreachable(); | |
9359 | } | |
9360 | break; | |
9361 | ||
9362 | case elfcpp::R_MIPS_TLS_LDM: | |
9363 | case elfcpp::R_MIPS16_TLS_LDM: | |
9364 | case elfcpp::R_MICROMIPS_TLS_LDM: | |
9365 | if (optimized_type == tls::TLSOPT_NONE) | |
9366 | { | |
9367 | // We always record LDM symbols as local with index 0. | |
9368 | target->got_section()->record_local_got_symbol(mips_obj, 0, | |
9369 | r_addend, r_type, | |
9370 | -1U); | |
9371 | } | |
9372 | else | |
9373 | { | |
9374 | // FIXME: TLS optimization not supported yet. | |
9375 | gold_unreachable(); | |
9376 | } | |
9377 | break; | |
9378 | case elfcpp::R_MIPS_TLS_GOTTPREL: | |
9379 | case elfcpp::R_MIPS16_TLS_GOTTPREL: | |
9380 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: | |
9381 | layout->set_has_static_tls(); | |
9382 | if (optimized_type == tls::TLSOPT_NONE) | |
9383 | { | |
9384 | // Create a GOT entry for the tp-relative offset. | |
9385 | Mips_output_data_got<size, big_endian>* got = | |
9386 | target->got_section(symtab, layout); | |
9387 | got->record_global_got_symbol(mips_sym, mips_obj, r_type, false, | |
9388 | false); | |
9389 | } | |
9390 | else | |
9391 | { | |
9392 | // FIXME: TLS optimization not supported yet. | |
9393 | gold_unreachable(); | |
9394 | } | |
9395 | break; | |
9396 | ||
9397 | default: | |
9398 | gold_unreachable(); | |
9399 | } | |
9400 | } | |
9401 | break; | |
9402 | case elfcpp::R_MIPS_COPY: | |
9403 | case elfcpp::R_MIPS_JUMP_SLOT: | |
9404 | // These are relocations which should only be seen by the | |
9405 | // dynamic linker, and should never be seen here. | |
9406 | gold_error(_("%s: unexpected reloc %u in object file"), | |
9407 | object->name().c_str(), r_type); | |
9408 | break; | |
9409 | ||
9410 | default: | |
9411 | break; | |
9412 | } | |
9413 | ||
9414 | // Refuse some position-dependent relocations when creating a | |
9415 | // shared library. Do not refuse R_MIPS_32 / R_MIPS_64; they're | |
9416 | // not PIC, but we can create dynamic relocations and the result | |
9417 | // will be fine. Also do not refuse R_MIPS_LO16, which can be | |
9418 | // combined with R_MIPS_GOT16. | |
9419 | if (parameters->options().shared()) | |
9420 | { | |
9421 | switch (r_type) | |
9422 | { | |
9423 | case elfcpp::R_MIPS16_HI16: | |
9424 | case elfcpp::R_MIPS_HI16: | |
9425 | case elfcpp::R_MICROMIPS_HI16: | |
9426 | // Don't refuse a high part relocation if it's against | |
9427 | // no symbol (e.g. part of a compound relocation). | |
9428 | if (r_sym == 0) | |
9429 | break; | |
9430 | ||
9431 | // R_MIPS_HI16 against _gp_disp is used for $gp setup, | |
9432 | // and has a special meaning. | |
9433 | if (!mips_obj->is_newabi() && strcmp(gsym->name(), "_gp_disp") == 0) | |
9434 | break; | |
9435 | ||
9436 | // FALLTHROUGH | |
9437 | ||
9438 | case elfcpp::R_MIPS16_26: | |
9439 | case elfcpp::R_MIPS_26: | |
9440 | case elfcpp::R_MICROMIPS_26_S1: | |
9441 | gold_error(_("%s: relocation %u against `%s' can not be used when " | |
9442 | "making a shared object; recompile with -fPIC"), | |
9443 | object->name().c_str(), r_type, gsym->name()); | |
9444 | default: | |
9445 | break; | |
9446 | } | |
9447 | } | |
9448 | } | |
9449 | ||
9450 | template<int size, bool big_endian> | |
9451 | inline void | |
9452 | Target_mips<size, big_endian>::Scan::global( | |
9453 | Symbol_table* symtab, | |
9454 | Layout* layout, | |
9455 | Target_mips<size, big_endian>* target, | |
9456 | Sized_relobj_file<size, big_endian>* object, | |
9457 | unsigned int data_shndx, | |
9458 | Output_section* output_section, | |
9459 | const elfcpp::Rela<size, big_endian>& reloc, | |
9460 | unsigned int r_type, | |
9461 | Symbol* gsym) | |
9462 | { | |
9463 | global( | |
9464 | symtab, | |
9465 | layout, | |
9466 | target, | |
9467 | object, | |
9468 | data_shndx, | |
9469 | output_section, | |
9470 | &reloc, | |
9471 | (const elfcpp::Rel<size, big_endian>*) NULL, | |
9472 | elfcpp::SHT_RELA, | |
9473 | r_type, | |
9474 | gsym); | |
9475 | } | |
9476 | ||
9477 | template<int size, bool big_endian> | |
9478 | inline void | |
9479 | Target_mips<size, big_endian>::Scan::global( | |
9480 | Symbol_table* symtab, | |
9481 | Layout* layout, | |
9482 | Target_mips<size, big_endian>* target, | |
9483 | Sized_relobj_file<size, big_endian>* object, | |
9484 | unsigned int data_shndx, | |
9485 | Output_section* output_section, | |
9486 | const elfcpp::Rel<size, big_endian>& reloc, | |
9487 | unsigned int r_type, | |
9488 | Symbol* gsym) | |
9489 | { | |
9490 | global( | |
9491 | symtab, | |
9492 | layout, | |
9493 | target, | |
9494 | object, | |
9495 | data_shndx, | |
9496 | output_section, | |
9497 | (const elfcpp::Rela<size, big_endian>*) NULL, | |
9498 | &reloc, | |
9499 | elfcpp::SHT_REL, | |
9500 | r_type, | |
9501 | gsym); | |
9502 | } | |
9503 | ||
9504 | // Return whether a R_MIPS_32 relocation needs to be applied. | |
9505 | ||
9506 | template<int size, bool big_endian> | |
9507 | inline bool | |
9508 | Target_mips<size, big_endian>::Relocate::should_apply_r_mips_32_reloc( | |
9509 | const Mips_symbol<size>* gsym, | |
9510 | unsigned int r_type, | |
9511 | Output_section* output_section, | |
9512 | Target_mips* target) | |
9513 | { | |
9514 | // If the output section is not allocated, then we didn't call | |
9515 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
9516 | // the reloc here. | |
9517 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
9518 | return true; | |
9519 | ||
9520 | if (gsym == NULL) | |
9521 | return true; | |
9522 | else | |
9523 | { | |
9524 | // For global symbols, we use the same helper routines used in the | |
9525 | // scan pass. | |
9526 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) | |
9527 | && !gsym->may_need_copy_reloc()) | |
9528 | { | |
9529 | // We have generated dynamic reloc (R_MIPS_REL32). | |
9530 | ||
9531 | bool multi_got = false; | |
9532 | if (target->has_got_section()) | |
9533 | multi_got = target->got_section()->multi_got(); | |
9534 | bool has_got_offset; | |
9535 | if (!multi_got) | |
9536 | has_got_offset = gsym->has_got_offset(GOT_TYPE_STANDARD); | |
9537 | else | |
9538 | has_got_offset = gsym->global_gotoffset() != -1U; | |
9539 | if (!has_got_offset) | |
9540 | return true; | |
9541 | else | |
9542 | // Apply the relocation only if the symbol is in the local got. | |
9543 | // Do not apply the relocation if the symbol is in the global | |
9544 | // got. | |
9545 | return symbol_references_local(gsym, gsym->has_dynsym_index()); | |
9546 | } | |
9547 | else | |
9548 | // We have not generated dynamic reloc. | |
9549 | return true; | |
9550 | } | |
9551 | } | |
9552 | ||
9553 | // Perform a relocation. | |
9554 | ||
9555 | template<int size, bool big_endian> | |
9556 | inline bool | |
9557 | Target_mips<size, big_endian>::Relocate::relocate( | |
9558 | const Relocate_info<size, big_endian>* relinfo, | |
9559 | Target_mips* target, | |
9560 | Output_section* output_section, | |
9561 | size_t relnum, | |
9562 | const elfcpp::Rela<size, big_endian>* rela, | |
9563 | const elfcpp::Rel<size, big_endian>* rel, | |
9564 | unsigned int rel_type, | |
9565 | unsigned int r_type, | |
9566 | const Sized_symbol<size>* gsym, | |
9567 | const Symbol_value<size>* psymval, | |
9568 | unsigned char* view, | |
9569 | Mips_address address, | |
9570 | section_size_type) | |
9571 | { | |
9572 | Mips_address r_offset; | |
9573 | typename elfcpp::Elf_types<size>::Elf_WXword r_info; | |
9574 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend; | |
9575 | ||
9576 | if (rel_type == elfcpp::SHT_RELA) | |
9577 | { | |
9578 | r_offset = rela->get_r_offset(); | |
9579 | r_info = rela->get_r_info(); | |
9580 | r_addend = rela->get_r_addend(); | |
9581 | } | |
9582 | else | |
9583 | { | |
9584 | r_offset = rel->get_r_offset(); | |
9585 | r_info = rel->get_r_info(); | |
9586 | r_addend = 0; | |
9587 | } | |
9588 | ||
9589 | typedef Mips_relocate_functions<size, big_endian> Reloc_funcs; | |
9590 | typename Reloc_funcs::Status reloc_status = Reloc_funcs::STATUS_OKAY; | |
9591 | ||
9592 | Mips_relobj<size, big_endian>* object = | |
9593 | Mips_relobj<size, big_endian>::as_mips_relobj(relinfo->object); | |
9594 | ||
9595 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
9596 | bool target_is_16_bit_code = false; | |
9597 | bool target_is_micromips_code = false; | |
9598 | bool cross_mode_jump; | |
9599 | ||
9600 | Symbol_value<size> symval; | |
9601 | ||
9602 | const Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(gsym); | |
9603 | ||
9604 | bool changed_symbol_value = false; | |
9605 | if (gsym == NULL) | |
9606 | { | |
9607 | target_is_16_bit_code = object->local_symbol_is_mips16(r_sym); | |
9608 | target_is_micromips_code = object->local_symbol_is_micromips(r_sym); | |
9609 | if (target_is_16_bit_code || target_is_micromips_code) | |
9610 | { | |
9611 | // MIPS16/microMIPS text labels should be treated as odd. | |
9612 | symval.set_output_value(psymval->value(object, 1)); | |
9613 | psymval = &symval; | |
9614 | changed_symbol_value = true; | |
9615 | } | |
9616 | } | |
9617 | else | |
9618 | { | |
9619 | target_is_16_bit_code = mips_sym->is_mips16(); | |
9620 | target_is_micromips_code = mips_sym->is_micromips(); | |
9621 | ||
9622 | // If this is a mips16/microMIPS text symbol, add 1 to the value to make | |
9623 | // it odd. This will cause something like .word SYM to come up with | |
9624 | // the right value when it is loaded into the PC. | |
9625 | ||
9626 | if ((mips_sym->is_mips16() || mips_sym->is_micromips()) | |
9627 | && psymval->value(object, 0) != 0) | |
9628 | { | |
9629 | symval.set_output_value(psymval->value(object, 0) | 1); | |
9630 | psymval = &symval; | |
9631 | changed_symbol_value = true; | |
9632 | } | |
9633 | ||
9634 | // Pick the value to use for symbols defined in shared objects. | |
9635 | if (mips_sym->use_plt_offset(Scan::get_reference_flags(r_type)) | |
9636 | || mips_sym->has_lazy_stub()) | |
9637 | { | |
9638 | Mips_address value; | |
9639 | if (!mips_sym->has_lazy_stub()) | |
9640 | { | |
9641 | // Prefer a standard MIPS PLT entry. | |
9642 | if (mips_sym->has_mips_plt_offset()) | |
9643 | { | |
9644 | value = target->plt_section()->mips_entry_address(mips_sym); | |
9645 | target_is_micromips_code = false; | |
9646 | target_is_16_bit_code = false; | |
9647 | } | |
9648 | else | |
9649 | { | |
9650 | value = (target->plt_section()->comp_entry_address(mips_sym) | |
9651 | + 1); | |
9652 | if (target->is_output_micromips()) | |
9653 | target_is_micromips_code = true; | |
9654 | else | |
9655 | target_is_16_bit_code = true; | |
9656 | } | |
9657 | } | |
9658 | else | |
9659 | value = target->mips_stubs_section()->stub_address(mips_sym); | |
9660 | ||
9661 | symval.set_output_value(value); | |
9662 | psymval = &symval; | |
9663 | } | |
9664 | } | |
9665 | ||
9666 | // TRUE if the symbol referred to by this relocation is "_gp_disp". | |
9667 | // Note that such a symbol must always be a global symbol. | |
9668 | bool gp_disp = (gsym != NULL && (strcmp(gsym->name(), "_gp_disp") == 0) | |
9669 | && !object->is_newabi()); | |
9670 | ||
9671 | // TRUE if the symbol referred to by this relocation is "__gnu_local_gp". | |
9672 | // Note that such a symbol must always be a global symbol. | |
9673 | bool gnu_local_gp = gsym && (strcmp(gsym->name(), "__gnu_local_gp") == 0); | |
9674 | ||
9675 | ||
9676 | if (gp_disp) | |
9677 | { | |
9678 | if (!hi16_reloc(r_type) && !lo16_reloc(r_type)) | |
9679 | gold_error_at_location(relinfo, relnum, r_offset, | |
9680 | _("relocations against _gp_disp are permitted only" | |
9681 | " with R_MIPS_HI16 and R_MIPS_LO16 relocations.")); | |
9682 | } | |
9683 | else if (gnu_local_gp) | |
9684 | { | |
9685 | // __gnu_local_gp is _gp symbol. | |
9686 | symval.set_output_value(target->adjusted_gp_value(object)); | |
9687 | psymval = &symval; | |
9688 | } | |
9689 | ||
9690 | // If this is a reference to a 16-bit function with a stub, we need | |
9691 | // to redirect the relocation to the stub unless: | |
9692 | // | |
9693 | // (a) the relocation is for a MIPS16 JAL; | |
9694 | // | |
9695 | // (b) the relocation is for a MIPS16 PIC call, and there are no | |
9696 | // non-MIPS16 uses of the GOT slot; or | |
9697 | // | |
9698 | // (c) the section allows direct references to MIPS16 functions. | |
9699 | if (r_type != elfcpp::R_MIPS16_26 | |
9700 | && !parameters->options().relocatable() | |
9701 | && ((mips_sym != NULL | |
9702 | && mips_sym->has_mips16_fn_stub() | |
9703 | && (r_type != elfcpp::R_MIPS16_CALL16 || mips_sym->need_fn_stub())) | |
9704 | || (mips_sym == NULL | |
9705 | && object->get_local_mips16_fn_stub(r_sym) != NULL)) | |
9706 | && !object->section_allows_mips16_refs(relinfo->data_shndx)) | |
9707 | { | |
9708 | // This is a 32- or 64-bit call to a 16-bit function. We should | |
9709 | // have already noticed that we were going to need the | |
9710 | // stub. | |
9711 | Mips_address value; | |
9712 | if (mips_sym == NULL) | |
9713 | value = object->get_local_mips16_fn_stub(r_sym)->output_address(); | |
9714 | else | |
9715 | { | |
9716 | gold_assert(mips_sym->need_fn_stub()); | |
9717 | if (mips_sym->has_la25_stub()) | |
9718 | value = target->la25_stub_section()->stub_address(mips_sym); | |
9719 | else | |
9720 | { | |
9721 | value = mips_sym->template | |
9722 | get_mips16_fn_stub<big_endian>()->output_address(); | |
9723 | } | |
9724 | } | |
9725 | symval.set_output_value(value); | |
9726 | psymval = &symval; | |
9727 | changed_symbol_value = true; | |
9728 | ||
9729 | // The target is 16-bit, but the stub isn't. | |
9730 | target_is_16_bit_code = false; | |
9731 | } | |
9732 | // If this is a MIPS16 call with a stub, that is made through the PLT or | |
9733 | // to a standard MIPS function, we need to redirect the call to the stub. | |
9734 | // Note that we specifically exclude R_MIPS16_CALL16 from this behavior; | |
9735 | // indirect calls should use an indirect stub instead. | |
9736 | else if (r_type == elfcpp::R_MIPS16_26 && !parameters->options().relocatable() | |
9737 | && ((mips_sym != NULL | |
9738 | && (mips_sym->has_mips16_call_stub() | |
9739 | || mips_sym->has_mips16_call_fp_stub())) | |
9740 | || (mips_sym == NULL | |
9741 | && object->get_local_mips16_call_stub(r_sym) != NULL)) | |
9742 | && ((mips_sym != NULL && mips_sym->has_plt_offset()) | |
9743 | || !target_is_16_bit_code)) | |
9744 | { | |
9745 | Mips16_stub_section<size, big_endian>* call_stub; | |
9746 | if (mips_sym == NULL) | |
9747 | call_stub = object->get_local_mips16_call_stub(r_sym); | |
9748 | else | |
9749 | { | |
9750 | // If both call_stub and call_fp_stub are defined, we can figure | |
9751 | // out which one to use by checking which one appears in the input | |
9752 | // file. | |
9753 | if (mips_sym->has_mips16_call_stub() | |
9754 | && mips_sym->has_mips16_call_fp_stub()) | |
9755 | { | |
9756 | call_stub = NULL; | |
9757 | for (unsigned int i = 1; i < object->shnum(); ++i) | |
9758 | { | |
9759 | if (object->is_mips16_call_fp_stub_section(i)) | |
9760 | { | |
9761 | call_stub = mips_sym->template | |
9762 | get_mips16_call_fp_stub<big_endian>(); | |
9763 | break; | |
9764 | } | |
9765 | ||
9766 | } | |
9767 | if (call_stub == NULL) | |
9768 | call_stub = | |
9769 | mips_sym->template get_mips16_call_stub<big_endian>(); | |
9770 | } | |
9771 | else if (mips_sym->has_mips16_call_stub()) | |
9772 | call_stub = mips_sym->template get_mips16_call_stub<big_endian>(); | |
9773 | else | |
9774 | call_stub = mips_sym->template get_mips16_call_fp_stub<big_endian>(); | |
9775 | } | |
9776 | ||
9777 | symval.set_output_value(call_stub->output_address()); | |
9778 | psymval = &symval; | |
9779 | changed_symbol_value = true; | |
9780 | } | |
9781 | // If this is a direct call to a PIC function, redirect to the | |
9782 | // non-PIC stub. | |
9783 | else if (mips_sym != NULL | |
9784 | && mips_sym->has_la25_stub() | |
9785 | && relocation_needs_la25_stub<size, big_endian>( | |
9786 | object, r_type, target_is_16_bit_code)) | |
9787 | { | |
9788 | Mips_address value = target->la25_stub_section()->stub_address(mips_sym); | |
9789 | if (mips_sym->is_micromips()) | |
9790 | value += 1; | |
9791 | symval.set_output_value(value); | |
9792 | psymval = &symval; | |
9793 | } | |
9794 | // For direct MIPS16 and microMIPS calls make sure the compressed PLT | |
9795 | // entry is used if a standard PLT entry has also been made. | |
9796 | else if ((r_type == elfcpp::R_MIPS16_26 | |
9797 | || r_type == elfcpp::R_MICROMIPS_26_S1) | |
9798 | && !parameters->options().relocatable() | |
9799 | && mips_sym != NULL | |
9800 | && mips_sym->has_plt_offset() | |
9801 | && mips_sym->has_comp_plt_offset() | |
9802 | && mips_sym->has_mips_plt_offset()) | |
9803 | { | |
9804 | Mips_address value = (target->plt_section()->comp_entry_address(mips_sym) | |
9805 | + 1); | |
9806 | symval.set_output_value(value); | |
9807 | psymval = &symval; | |
9808 | ||
9809 | target_is_16_bit_code = !target->is_output_micromips(); | |
9810 | target_is_micromips_code = target->is_output_micromips(); | |
9811 | } | |
9812 | ||
9813 | // Make sure MIPS16 and microMIPS are not used together. | |
9814 | if ((r_type == elfcpp::R_MIPS16_26 && target_is_micromips_code) | |
9815 | || (micromips_branch_reloc(r_type) && target_is_16_bit_code)) | |
9816 | { | |
9817 | gold_error(_("MIPS16 and microMIPS functions cannot call each other")); | |
9818 | } | |
9819 | ||
9820 | // Calls from 16-bit code to 32-bit code and vice versa require the | |
9821 | // mode change. However, we can ignore calls to undefined weak symbols, | |
9822 | // which should never be executed at runtime. This exception is important | |
9823 | // because the assembly writer may have "known" that any definition of the | |
9824 | // symbol would be 16-bit code, and that direct jumps were therefore | |
9825 | // acceptable. | |
9826 | cross_mode_jump = | |
9827 | (!parameters->options().relocatable() | |
9828 | && !(gsym != NULL && gsym->is_weak_undefined()) | |
9829 | && ((r_type == elfcpp::R_MIPS16_26 && !target_is_16_bit_code) | |
9830 | || (r_type == elfcpp::R_MICROMIPS_26_S1 && !target_is_micromips_code) | |
9831 | || ((r_type == elfcpp::R_MIPS_26 || r_type == elfcpp::R_MIPS_JALR) | |
9832 | && (target_is_16_bit_code || target_is_micromips_code)))); | |
9833 | ||
9834 | bool local = (mips_sym == NULL | |
9835 | || (mips_sym->got_only_for_calls() | |
9836 | ? symbol_calls_local(mips_sym, mips_sym->has_dynsym_index()) | |
9837 | : symbol_references_local(mips_sym, | |
9838 | mips_sym->has_dynsym_index()))); | |
9839 | ||
9840 | // Global R_MIPS_GOT_PAGE/R_MICROMIPS_GOT_PAGE relocations are equivalent | |
9841 | // to R_MIPS_GOT_DISP/R_MICROMIPS_GOT_DISP. The addend is applied by the | |
9842 | // corresponding R_MIPS_GOT_OFST/R_MICROMIPS_GOT_OFST. | |
9843 | if (got_page_reloc(r_type) && !local) | |
9844 | r_type = (micromips_reloc(r_type) ? elfcpp::R_MICROMIPS_GOT_DISP | |
9845 | : elfcpp::R_MIPS_GOT_DISP); | |
9846 | ||
9847 | unsigned int got_offset = 0; | |
9848 | int gp_offset = 0; | |
9849 | ||
9850 | bool update_got_entry = false; | |
9851 | bool extract_addend = rel_type == elfcpp::SHT_REL; | |
9852 | switch (r_type) | |
9853 | { | |
9854 | case elfcpp::R_MIPS_NONE: | |
9855 | break; | |
9856 | case elfcpp::R_MIPS_16: | |
9857 | reloc_status = Reloc_funcs::rel16(view, object, psymval, r_addend, | |
9858 | extract_addend, r_type); | |
9859 | break; | |
9860 | ||
9861 | case elfcpp::R_MIPS_32: | |
9862 | if (should_apply_r_mips_32_reloc(mips_sym, r_type, output_section, | |
9863 | target)) | |
9864 | reloc_status = Reloc_funcs::rel32(view, object, psymval, r_addend, | |
9865 | extract_addend, r_type); | |
9866 | if (mips_sym != NULL | |
9867 | && (mips_sym->is_mips16() || mips_sym->is_micromips()) | |
9868 | && mips_sym->global_got_area() == GGA_RELOC_ONLY) | |
9869 | { | |
9870 | // If mips_sym->has_mips16_fn_stub() is false, symbol value is | |
9871 | // already updated by adding +1. | |
9872 | if (mips_sym->has_mips16_fn_stub()) | |
9873 | { | |
9874 | gold_assert(mips_sym->need_fn_stub()); | |
9875 | Mips16_stub_section<size, big_endian>* fn_stub = | |
9876 | mips_sym->template get_mips16_fn_stub<big_endian>(); | |
9877 | ||
9878 | symval.set_output_value(fn_stub->output_address()); | |
9879 | psymval = &symval; | |
9880 | } | |
9881 | got_offset = mips_sym->global_gotoffset(); | |
9882 | update_got_entry = true; | |
9883 | } | |
9884 | break; | |
9885 | ||
9886 | case elfcpp::R_MIPS_REL32: | |
9887 | gold_unreachable(); | |
9888 | ||
9889 | case elfcpp::R_MIPS_PC32: | |
9890 | reloc_status = Reloc_funcs::relpc32(view, object, psymval, address, | |
9891 | r_addend, extract_addend, r_type); | |
9892 | break; | |
9893 | ||
9894 | case elfcpp::R_MIPS16_26: | |
9895 | // The calculation for R_MIPS16_26 is just the same as for an | |
9896 | // R_MIPS_26. It's only the storage of the relocated field into | |
9897 | // the output file that's different. So, we just fall through to the | |
9898 | // R_MIPS_26 case here. | |
9899 | case elfcpp::R_MIPS_26: | |
9900 | case elfcpp::R_MICROMIPS_26_S1: | |
9901 | reloc_status = Reloc_funcs::rel26(view, object, psymval, address, | |
9902 | gsym == NULL, r_addend, extract_addend, gsym, cross_mode_jump, r_type, | |
9903 | target->jal_to_bal()); | |
9904 | break; | |
9905 | ||
9906 | case elfcpp::R_MIPS_HI16: | |
9907 | case elfcpp::R_MIPS16_HI16: | |
9908 | case elfcpp::R_MICROMIPS_HI16: | |
9909 | reloc_status = Reloc_funcs::relhi16(view, object, psymval, r_addend, | |
9910 | address, gp_disp, r_type, | |
9911 | extract_addend); | |
9912 | break; | |
9913 | ||
9914 | case elfcpp::R_MIPS_LO16: | |
9915 | case elfcpp::R_MIPS16_LO16: | |
9916 | case elfcpp::R_MICROMIPS_LO16: | |
9917 | case elfcpp::R_MICROMIPS_HI0_LO16: | |
9918 | reloc_status = Reloc_funcs::rello16(target, view, object, psymval, | |
9919 | r_addend, extract_addend, address, | |
9920 | gp_disp, r_type); | |
9921 | break; | |
9922 | ||
9923 | case elfcpp::R_MIPS_LITERAL: | |
9924 | case elfcpp::R_MICROMIPS_LITERAL: | |
9925 | // Because we don't merge literal sections, we can handle this | |
9926 | // just like R_MIPS_GPREL16. In the long run, we should merge | |
9927 | // shared literals, and then we will need to additional work | |
9928 | // here. | |
9929 | ||
9930 | // Fall through. | |
9931 | ||
9932 | case elfcpp::R_MIPS_GPREL16: | |
9933 | case elfcpp::R_MIPS16_GPREL: | |
9934 | case elfcpp::R_MICROMIPS_GPREL7_S2: | |
9935 | case elfcpp::R_MICROMIPS_GPREL16: | |
9936 | reloc_status = Reloc_funcs::relgprel(view, object, psymval, | |
9937 | target->adjusted_gp_value(object), | |
9938 | r_addend, extract_addend, | |
9939 | gsym == NULL, r_type); | |
9940 | break; | |
9941 | ||
9942 | case elfcpp::R_MIPS_PC16: | |
9943 | reloc_status = Reloc_funcs::relpc16(view, object, psymval, address, | |
9944 | r_addend, extract_addend, r_type); | |
9945 | break; | |
9946 | case elfcpp::R_MICROMIPS_PC7_S1: | |
9947 | reloc_status = Reloc_funcs::relmicromips_pc7_s1(view, object, psymval, | |
9948 | address, r_addend, | |
9949 | extract_addend, r_type); | |
9950 | break; | |
9951 | case elfcpp::R_MICROMIPS_PC10_S1: | |
9952 | reloc_status = Reloc_funcs::relmicromips_pc10_s1(view, object, psymval, | |
9953 | address, r_addend, | |
9954 | extract_addend, r_type); | |
9955 | break; | |
9956 | case elfcpp::R_MICROMIPS_PC16_S1: | |
9957 | reloc_status = Reloc_funcs::relmicromips_pc16_s1(view, object, psymval, | |
9958 | address, r_addend, | |
9959 | extract_addend, r_type); | |
9960 | break; | |
9961 | case elfcpp::R_MIPS_GPREL32: | |
9962 | reloc_status = Reloc_funcs::relgprel32(view, object, psymval, | |
9963 | target->adjusted_gp_value(object), | |
9964 | r_addend, extract_addend, r_type); | |
9965 | break; | |
9966 | case elfcpp::R_MIPS_GOT_HI16: | |
9967 | case elfcpp::R_MIPS_CALL_HI16: | |
9968 | case elfcpp::R_MICROMIPS_GOT_HI16: | |
9969 | case elfcpp::R_MICROMIPS_CALL_HI16: | |
9970 | if (gsym != NULL) | |
9971 | got_offset = target->got_section()->got_offset(gsym, GOT_TYPE_STANDARD, | |
9972 | object); | |
9973 | else | |
9974 | got_offset = target->got_section()->got_offset(r_sym, GOT_TYPE_STANDARD, | |
9975 | object); | |
9976 | gp_offset = target->got_section()->gp_offset(got_offset, object); | |
9977 | reloc_status = Reloc_funcs::relgot_hi16(view, gp_offset, r_type); | |
9978 | update_got_entry = changed_symbol_value; | |
9979 | break; | |
9980 | ||
9981 | case elfcpp::R_MIPS_GOT_LO16: | |
9982 | case elfcpp::R_MIPS_CALL_LO16: | |
9983 | case elfcpp::R_MICROMIPS_GOT_LO16: | |
9984 | case elfcpp::R_MICROMIPS_CALL_LO16: | |
9985 | if (gsym != NULL) | |
9986 | got_offset = target->got_section()->got_offset(gsym, GOT_TYPE_STANDARD, | |
9987 | object); | |
9988 | else | |
9989 | got_offset = target->got_section()->got_offset(r_sym, GOT_TYPE_STANDARD, | |
9990 | object); | |
9991 | gp_offset = target->got_section()->gp_offset(got_offset, object); | |
9992 | reloc_status = Reloc_funcs::relgot_lo16(view, gp_offset, r_type); | |
9993 | update_got_entry = changed_symbol_value; | |
9994 | break; | |
9995 | ||
9996 | case elfcpp::R_MIPS_GOT_DISP: | |
9997 | case elfcpp::R_MICROMIPS_GOT_DISP: | |
9998 | if (gsym != NULL) | |
9999 | got_offset = target->got_section()->got_offset(gsym, GOT_TYPE_STANDARD, | |
10000 | object); | |
10001 | else | |
10002 | got_offset = target->got_section()->got_offset(r_sym, GOT_TYPE_STANDARD, | |
10003 | object); | |
10004 | gp_offset = target->got_section()->gp_offset(got_offset, object); | |
10005 | reloc_status = Reloc_funcs::relgot(view, gp_offset, r_type); | |
10006 | break; | |
10007 | ||
10008 | case elfcpp::R_MIPS_CALL16: | |
10009 | case elfcpp::R_MIPS16_CALL16: | |
10010 | case elfcpp::R_MICROMIPS_CALL16: | |
10011 | gold_assert(gsym != NULL); | |
10012 | got_offset = target->got_section()->got_offset(gsym, GOT_TYPE_STANDARD, | |
10013 | object); | |
10014 | gp_offset = target->got_section()->gp_offset(got_offset, object); | |
10015 | reloc_status = Reloc_funcs::relgot(view, gp_offset, r_type); | |
10016 | // TODO(sasa): We should also initialize update_got_entry in other places | |
10017 | // where relgot is called. | |
10018 | update_got_entry = changed_symbol_value; | |
10019 | break; | |
10020 | ||
10021 | case elfcpp::R_MIPS_GOT16: | |
10022 | case elfcpp::R_MIPS16_GOT16: | |
10023 | case elfcpp::R_MICROMIPS_GOT16: | |
10024 | if (gsym != NULL) | |
10025 | { | |
10026 | got_offset = target->got_section()->got_offset(gsym, | |
10027 | GOT_TYPE_STANDARD, | |
10028 | object); | |
10029 | gp_offset = target->got_section()->gp_offset(got_offset, object); | |
10030 | reloc_status = Reloc_funcs::relgot(view, gp_offset, r_type); | |
10031 | } | |
10032 | else | |
10033 | reloc_status = Reloc_funcs::relgot16_local(view, object, psymval, | |
10034 | r_addend, extract_addend, | |
10035 | r_type); | |
10036 | update_got_entry = changed_symbol_value; | |
10037 | break; | |
10038 | ||
10039 | case elfcpp::R_MIPS_TLS_GD: | |
10040 | case elfcpp::R_MIPS16_TLS_GD: | |
10041 | case elfcpp::R_MICROMIPS_TLS_GD: | |
10042 | if (gsym != NULL) | |
10043 | got_offset = target->got_section()->got_offset(gsym, GOT_TYPE_TLS_PAIR, | |
10044 | object); | |
10045 | else | |
10046 | got_offset = target->got_section()->got_offset(r_sym, GOT_TYPE_TLS_PAIR, | |
10047 | object); | |
10048 | gp_offset = target->got_section()->gp_offset(got_offset, object); | |
10049 | reloc_status = Reloc_funcs::relgot(view, gp_offset, r_type); | |
10050 | break; | |
10051 | ||
10052 | case elfcpp::R_MIPS_TLS_GOTTPREL: | |
10053 | case elfcpp::R_MIPS16_TLS_GOTTPREL: | |
10054 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: | |
10055 | if (gsym != NULL) | |
10056 | got_offset = target->got_section()->got_offset(gsym, | |
10057 | GOT_TYPE_TLS_OFFSET, | |
10058 | object); | |
10059 | else | |
10060 | got_offset = target->got_section()->got_offset(r_sym, | |
10061 | GOT_TYPE_TLS_OFFSET, | |
10062 | object); | |
10063 | gp_offset = target->got_section()->gp_offset(got_offset, object); | |
10064 | reloc_status = Reloc_funcs::relgot(view, gp_offset, r_type); | |
10065 | break; | |
10066 | ||
10067 | case elfcpp::R_MIPS_TLS_LDM: | |
10068 | case elfcpp::R_MIPS16_TLS_LDM: | |
10069 | case elfcpp::R_MICROMIPS_TLS_LDM: | |
10070 | // Relocate the field with the offset of the GOT entry for | |
10071 | // the module index. | |
10072 | got_offset = target->got_section()->tls_ldm_offset(object); | |
10073 | gp_offset = target->got_section()->gp_offset(got_offset, object); | |
10074 | reloc_status = Reloc_funcs::relgot(view, gp_offset, r_type); | |
10075 | break; | |
10076 | ||
10077 | case elfcpp::R_MIPS_GOT_PAGE: | |
10078 | case elfcpp::R_MICROMIPS_GOT_PAGE: | |
10079 | reloc_status = Reloc_funcs::relgotpage(target, view, object, psymval, | |
10080 | r_addend, extract_addend, r_type); | |
10081 | break; | |
10082 | ||
10083 | case elfcpp::R_MIPS_GOT_OFST: | |
10084 | case elfcpp::R_MICROMIPS_GOT_OFST: | |
10085 | reloc_status = Reloc_funcs::relgotofst(target, view, object, psymval, | |
10086 | r_addend, extract_addend, local, | |
10087 | r_type); | |
10088 | break; | |
10089 | ||
10090 | case elfcpp::R_MIPS_JALR: | |
10091 | case elfcpp::R_MICROMIPS_JALR: | |
10092 | // This relocation is only a hint. In some cases, we optimize | |
10093 | // it into a bal instruction. But we don't try to optimize | |
10094 | // when the symbol does not resolve locally. | |
10095 | if (gsym == NULL || symbol_calls_local(gsym, gsym->has_dynsym_index())) | |
10096 | reloc_status = Reloc_funcs::reljalr(view, object, psymval, address, | |
10097 | r_addend, extract_addend, | |
10098 | cross_mode_jump, r_type, | |
10099 | target->jalr_to_bal(), | |
10100 | target->jr_to_b()); | |
10101 | break; | |
10102 | ||
10103 | case elfcpp::R_MIPS_TLS_DTPREL_HI16: | |
10104 | case elfcpp::R_MIPS16_TLS_DTPREL_HI16: | |
10105 | case elfcpp::R_MICROMIPS_TLS_DTPREL_HI16: | |
10106 | reloc_status = Reloc_funcs::tlsrelhi16(view, object, psymval, | |
10107 | elfcpp::DTP_OFFSET, r_addend, | |
10108 | extract_addend, r_type); | |
10109 | break; | |
10110 | case elfcpp::R_MIPS_TLS_DTPREL_LO16: | |
10111 | case elfcpp::R_MIPS16_TLS_DTPREL_LO16: | |
10112 | case elfcpp::R_MICROMIPS_TLS_DTPREL_LO16: | |
10113 | reloc_status = Reloc_funcs::tlsrello16(view, object, psymval, | |
10114 | elfcpp::DTP_OFFSET, r_addend, | |
10115 | extract_addend, r_type); | |
10116 | break; | |
10117 | case elfcpp::R_MIPS_TLS_DTPREL32: | |
10118 | case elfcpp::R_MIPS_TLS_DTPREL64: | |
10119 | reloc_status = Reloc_funcs::tlsrel32(view, object, psymval, | |
10120 | elfcpp::DTP_OFFSET, r_addend, | |
10121 | extract_addend, r_type); | |
10122 | break; | |
10123 | case elfcpp::R_MIPS_TLS_TPREL_HI16: | |
10124 | case elfcpp::R_MIPS16_TLS_TPREL_HI16: | |
10125 | case elfcpp::R_MICROMIPS_TLS_TPREL_HI16: | |
10126 | reloc_status = Reloc_funcs::tlsrelhi16(view, object, psymval, | |
10127 | elfcpp::TP_OFFSET, r_addend, | |
10128 | extract_addend, r_type); | |
10129 | break; | |
10130 | case elfcpp::R_MIPS_TLS_TPREL_LO16: | |
10131 | case elfcpp::R_MIPS16_TLS_TPREL_LO16: | |
10132 | case elfcpp::R_MICROMIPS_TLS_TPREL_LO16: | |
10133 | reloc_status = Reloc_funcs::tlsrello16(view, object, psymval, | |
10134 | elfcpp::TP_OFFSET, r_addend, | |
10135 | extract_addend, r_type); | |
10136 | break; | |
10137 | case elfcpp::R_MIPS_TLS_TPREL32: | |
10138 | case elfcpp::R_MIPS_TLS_TPREL64: | |
10139 | reloc_status = Reloc_funcs::tlsrel32(view, object, psymval, | |
10140 | elfcpp::TP_OFFSET, r_addend, | |
10141 | extract_addend, r_type); | |
10142 | break; | |
10143 | case elfcpp::R_MIPS_SUB: | |
10144 | case elfcpp::R_MICROMIPS_SUB: | |
10145 | reloc_status = Reloc_funcs::relsub(view, object, psymval, r_addend, | |
10146 | extract_addend, r_type); | |
10147 | break; | |
10148 | default: | |
10149 | gold_error_at_location(relinfo, relnum, r_offset, | |
10150 | _("unsupported reloc %u"), r_type); | |
10151 | break; | |
10152 | } | |
10153 | ||
10154 | if (update_got_entry) | |
10155 | { | |
10156 | Mips_output_data_got<size, big_endian>* got = target->got_section(); | |
10157 | if (mips_sym != NULL && mips_sym->get_applied_secondary_got_fixup()) | |
10158 | got->update_got_entry(got->get_primary_got_offset(mips_sym), | |
10159 | psymval->value(object, 0)); | |
10160 | else | |
10161 | got->update_got_entry(got_offset, psymval->value(object, 0)); | |
10162 | } | |
10163 | ||
10164 | // Report any errors. | |
10165 | switch (reloc_status) | |
10166 | { | |
10167 | case Reloc_funcs::STATUS_OKAY: | |
10168 | break; | |
10169 | case Reloc_funcs::STATUS_OVERFLOW: | |
10170 | gold_error_at_location(relinfo, relnum, r_offset, | |
10171 | _("relocation overflow")); | |
10172 | break; | |
10173 | case Reloc_funcs::STATUS_BAD_RELOC: | |
10174 | gold_error_at_location(relinfo, relnum, r_offset, | |
10175 | _("unexpected opcode while processing relocation")); | |
10176 | break; | |
10177 | default: | |
10178 | gold_unreachable(); | |
10179 | } | |
10180 | ||
10181 | return true; | |
10182 | } | |
10183 | ||
10184 | template<int size, bool big_endian> | |
10185 | inline bool | |
10186 | Target_mips<size, big_endian>::Relocate::relocate( | |
10187 | const Relocate_info<size, big_endian>* relinfo, | |
10188 | Target_mips* target, | |
10189 | Output_section* output_section, | |
10190 | size_t relnum, | |
10191 | const elfcpp::Rela<size, big_endian>& reloc, | |
10192 | unsigned int r_type, | |
10193 | const Sized_symbol<size>* gsym, | |
10194 | const Symbol_value<size>* psymval, | |
10195 | unsigned char* view, | |
10196 | Mips_address address, | |
10197 | section_size_type view_size) | |
10198 | { | |
10199 | return relocate( | |
10200 | relinfo, | |
10201 | target, | |
10202 | output_section, | |
10203 | relnum, | |
10204 | &reloc, | |
10205 | (const elfcpp::Rel<size, big_endian>*) NULL, | |
10206 | elfcpp::SHT_RELA, | |
10207 | r_type, | |
10208 | gsym, | |
10209 | psymval, | |
10210 | view, | |
10211 | address, | |
10212 | view_size); | |
10213 | } | |
10214 | ||
10215 | template<int size, bool big_endian> | |
10216 | inline bool | |
10217 | Target_mips<size, big_endian>::Relocate::relocate( | |
10218 | const Relocate_info<size, big_endian>* relinfo, | |
10219 | Target_mips* target, | |
10220 | Output_section* output_section, | |
10221 | size_t relnum, | |
10222 | const elfcpp::Rel<size, big_endian>& reloc, | |
10223 | unsigned int r_type, | |
10224 | const Sized_symbol<size>* gsym, | |
10225 | const Symbol_value<size>* psymval, | |
10226 | unsigned char* view, | |
10227 | Mips_address address, | |
10228 | section_size_type view_size) | |
10229 | { | |
10230 | return relocate( | |
10231 | relinfo, | |
10232 | target, | |
10233 | output_section, | |
10234 | relnum, | |
10235 | (const elfcpp::Rela<size, big_endian>*) NULL, | |
10236 | &reloc, | |
10237 | elfcpp::SHT_REL, | |
10238 | r_type, | |
10239 | gsym, | |
10240 | psymval, | |
10241 | view, | |
10242 | address, | |
10243 | view_size); | |
10244 | } | |
10245 | ||
10246 | // Get the Reference_flags for a particular relocation. | |
10247 | ||
10248 | template<int size, bool big_endian> | |
10249 | int | |
10250 | Target_mips<size, big_endian>::Scan::get_reference_flags( | |
10251 | unsigned int r_type) | |
10252 | { | |
10253 | switch (r_type) | |
10254 | { | |
10255 | case elfcpp::R_MIPS_NONE: | |
10256 | // No symbol reference. | |
10257 | return 0; | |
10258 | ||
10259 | case elfcpp::R_MIPS_16: | |
10260 | case elfcpp::R_MIPS_32: | |
10261 | case elfcpp::R_MIPS_64: | |
10262 | case elfcpp::R_MIPS_HI16: | |
10263 | case elfcpp::R_MIPS_LO16: | |
10264 | case elfcpp::R_MIPS16_HI16: | |
10265 | case elfcpp::R_MIPS16_LO16: | |
10266 | case elfcpp::R_MICROMIPS_HI16: | |
10267 | case elfcpp::R_MICROMIPS_LO16: | |
10268 | return Symbol::ABSOLUTE_REF; | |
10269 | ||
10270 | case elfcpp::R_MIPS_26: | |
10271 | case elfcpp::R_MIPS16_26: | |
10272 | case elfcpp::R_MICROMIPS_26_S1: | |
10273 | return Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF; | |
10274 | ||
10275 | case elfcpp::R_MIPS_GPREL32: | |
10276 | case elfcpp::R_MIPS_GPREL16: | |
10277 | case elfcpp::R_MIPS_REL32: | |
10278 | case elfcpp::R_MIPS16_GPREL: | |
10279 | return Symbol::RELATIVE_REF; | |
10280 | ||
10281 | case elfcpp::R_MIPS_PC16: | |
10282 | case elfcpp::R_MIPS_PC32: | |
10283 | case elfcpp::R_MIPS_JALR: | |
10284 | case elfcpp::R_MICROMIPS_JALR: | |
10285 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
10286 | ||
10287 | case elfcpp::R_MIPS_GOT16: | |
10288 | case elfcpp::R_MIPS_CALL16: | |
10289 | case elfcpp::R_MIPS_GOT_DISP: | |
10290 | case elfcpp::R_MIPS_GOT_HI16: | |
10291 | case elfcpp::R_MIPS_GOT_LO16: | |
10292 | case elfcpp::R_MIPS_CALL_HI16: | |
10293 | case elfcpp::R_MIPS_CALL_LO16: | |
10294 | case elfcpp::R_MIPS_LITERAL: | |
10295 | case elfcpp::R_MIPS_GOT_PAGE: | |
10296 | case elfcpp::R_MIPS_GOT_OFST: | |
10297 | case elfcpp::R_MIPS16_GOT16: | |
10298 | case elfcpp::R_MIPS16_CALL16: | |
10299 | case elfcpp::R_MICROMIPS_GOT16: | |
10300 | case elfcpp::R_MICROMIPS_CALL16: | |
10301 | case elfcpp::R_MICROMIPS_GOT_HI16: | |
10302 | case elfcpp::R_MICROMIPS_GOT_LO16: | |
10303 | case elfcpp::R_MICROMIPS_CALL_HI16: | |
10304 | case elfcpp::R_MICROMIPS_CALL_LO16: | |
10305 | // Absolute in GOT. | |
10306 | return Symbol::RELATIVE_REF; | |
10307 | ||
10308 | case elfcpp::R_MIPS_TLS_DTPMOD32: | |
10309 | case elfcpp::R_MIPS_TLS_DTPREL32: | |
10310 | case elfcpp::R_MIPS_TLS_DTPMOD64: | |
10311 | case elfcpp::R_MIPS_TLS_DTPREL64: | |
10312 | case elfcpp::R_MIPS_TLS_GD: | |
10313 | case elfcpp::R_MIPS_TLS_LDM: | |
10314 | case elfcpp::R_MIPS_TLS_DTPREL_HI16: | |
10315 | case elfcpp::R_MIPS_TLS_DTPREL_LO16: | |
10316 | case elfcpp::R_MIPS_TLS_GOTTPREL: | |
10317 | case elfcpp::R_MIPS_TLS_TPREL32: | |
10318 | case elfcpp::R_MIPS_TLS_TPREL64: | |
10319 | case elfcpp::R_MIPS_TLS_TPREL_HI16: | |
10320 | case elfcpp::R_MIPS_TLS_TPREL_LO16: | |
10321 | case elfcpp::R_MIPS16_TLS_GD: | |
10322 | case elfcpp::R_MIPS16_TLS_GOTTPREL: | |
10323 | case elfcpp::R_MICROMIPS_TLS_GD: | |
10324 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: | |
10325 | case elfcpp::R_MICROMIPS_TLS_TPREL_HI16: | |
10326 | case elfcpp::R_MICROMIPS_TLS_TPREL_LO16: | |
10327 | return Symbol::TLS_REF; | |
10328 | ||
10329 | case elfcpp::R_MIPS_COPY: | |
10330 | case elfcpp::R_MIPS_JUMP_SLOT: | |
10331 | default: | |
10332 | gold_unreachable(); | |
10333 | // Not expected. We will give an error later. | |
10334 | return 0; | |
10335 | } | |
10336 | } | |
10337 | ||
10338 | // Report an unsupported relocation against a local symbol. | |
10339 | ||
10340 | template<int size, bool big_endian> | |
10341 | void | |
10342 | Target_mips<size, big_endian>::Scan::unsupported_reloc_local( | |
10343 | Sized_relobj_file<size, big_endian>* object, | |
10344 | unsigned int r_type) | |
10345 | { | |
10346 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
10347 | object->name().c_str(), r_type); | |
10348 | } | |
10349 | ||
10350 | // Report an unsupported relocation against a global symbol. | |
10351 | ||
10352 | template<int size, bool big_endian> | |
10353 | void | |
10354 | Target_mips<size, big_endian>::Scan::unsupported_reloc_global( | |
10355 | Sized_relobj_file<size, big_endian>* object, | |
10356 | unsigned int r_type, | |
10357 | Symbol* gsym) | |
10358 | { | |
10359 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), | |
10360 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); | |
10361 | } | |
10362 | ||
10363 | // Return printable name for ABI. | |
10364 | template<int size, bool big_endian> | |
10365 | const char* | |
10366 | Target_mips<size, big_endian>::elf_mips_abi_name(elfcpp::Elf_Word e_flags, | |
10367 | unsigned char ei_class) | |
10368 | { | |
10369 | switch (e_flags & elfcpp::EF_MIPS_ABI) | |
10370 | { | |
10371 | case 0: | |
10372 | if ((e_flags & elfcpp::EF_MIPS_ABI2) != 0) | |
10373 | return "N32"; | |
10374 | else if (elfcpp::abi_64(ei_class)) | |
10375 | return "64"; | |
10376 | else | |
10377 | return "none"; | |
10378 | case elfcpp::E_MIPS_ABI_O32: | |
10379 | return "O32"; | |
10380 | case elfcpp::E_MIPS_ABI_O64: | |
10381 | return "O64"; | |
10382 | case elfcpp::E_MIPS_ABI_EABI32: | |
10383 | return "EABI32"; | |
10384 | case elfcpp::E_MIPS_ABI_EABI64: | |
10385 | return "EABI64"; | |
10386 | default: | |
10387 | return "unknown abi"; | |
10388 | } | |
10389 | } | |
10390 | ||
10391 | template<int size, bool big_endian> | |
10392 | const char* | |
10393 | Target_mips<size, big_endian>::elf_mips_mach_name(elfcpp::Elf_Word e_flags) | |
10394 | { | |
10395 | switch (e_flags & elfcpp::EF_MIPS_MACH) | |
10396 | { | |
10397 | case elfcpp::E_MIPS_MACH_3900: | |
10398 | return "mips:3900"; | |
10399 | case elfcpp::E_MIPS_MACH_4010: | |
10400 | return "mips:4010"; | |
10401 | case elfcpp::E_MIPS_MACH_4100: | |
10402 | return "mips:4100"; | |
10403 | case elfcpp::E_MIPS_MACH_4111: | |
10404 | return "mips:4111"; | |
10405 | case elfcpp::E_MIPS_MACH_4120: | |
10406 | return "mips:4120"; | |
10407 | case elfcpp::E_MIPS_MACH_4650: | |
10408 | return "mips:4650"; | |
10409 | case elfcpp::E_MIPS_MACH_5400: | |
10410 | return "mips:5400"; | |
10411 | case elfcpp::E_MIPS_MACH_5500: | |
10412 | return "mips:5500"; | |
10413 | case elfcpp::E_MIPS_MACH_SB1: | |
10414 | return "mips:sb1"; | |
10415 | case elfcpp::E_MIPS_MACH_9000: | |
10416 | return "mips:9000"; | |
10417 | case elfcpp::E_MIPS_MACH_LS2E: | |
10418 | return "mips:loongson-2e"; | |
10419 | case elfcpp::E_MIPS_MACH_LS2F: | |
10420 | return "mips:loongson-2f"; | |
10421 | case elfcpp::E_MIPS_MACH_LS3A: | |
10422 | return "mips:loongson-3a"; | |
10423 | case elfcpp::E_MIPS_MACH_OCTEON: | |
10424 | return "mips:octeon"; | |
10425 | case elfcpp::E_MIPS_MACH_OCTEON2: | |
10426 | return "mips:octeon2"; | |
10427 | case elfcpp::E_MIPS_MACH_XLR: | |
10428 | return "mips:xlr"; | |
10429 | default: | |
10430 | switch (e_flags & elfcpp::EF_MIPS_ARCH) | |
10431 | { | |
10432 | default: | |
10433 | case elfcpp::E_MIPS_ARCH_1: | |
10434 | return "mips:3000"; | |
10435 | ||
10436 | case elfcpp::E_MIPS_ARCH_2: | |
10437 | return "mips:6000"; | |
10438 | ||
10439 | case elfcpp::E_MIPS_ARCH_3: | |
10440 | return "mips:4000"; | |
10441 | ||
10442 | case elfcpp::E_MIPS_ARCH_4: | |
10443 | return "mips:8000"; | |
10444 | ||
10445 | case elfcpp::E_MIPS_ARCH_5: | |
10446 | return "mips:mips5"; | |
10447 | ||
10448 | case elfcpp::E_MIPS_ARCH_32: | |
10449 | return "mips:isa32"; | |
10450 | ||
10451 | case elfcpp::E_MIPS_ARCH_64: | |
10452 | return "mips:isa64"; | |
10453 | ||
10454 | case elfcpp::E_MIPS_ARCH_32R2: | |
10455 | return "mips:isa32r2"; | |
10456 | ||
10457 | case elfcpp::E_MIPS_ARCH_64R2: | |
10458 | return "mips:isa64r2"; | |
10459 | } | |
10460 | } | |
10461 | return "unknown CPU"; | |
10462 | } | |
10463 | ||
10464 | template<int size, bool big_endian> | |
10465 | Target::Target_info Target_mips<size, big_endian>::mips_info = | |
10466 | { | |
10467 | size, // size | |
10468 | big_endian, // is_big_endian | |
10469 | elfcpp::EM_MIPS, // machine_code | |
10470 | true, // has_make_symbol | |
10471 | false, // has_resolve | |
10472 | false, // has_code_fill | |
10473 | true, // is_default_stack_executable | |
10474 | false, // can_icf_inline_merge_sections | |
10475 | '\0', // wrap_char | |
10476 | "/lib/ld.so.1", // dynamic_linker | |
10477 | 0x400000, // default_text_segment_address | |
10478 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) | |
10479 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) | |
10480 | false, // isolate_execinstr | |
10481 | 0, // rosegment_gap | |
10482 | elfcpp::SHN_UNDEF, // small_common_shndx | |
10483 | elfcpp::SHN_UNDEF, // large_common_shndx | |
10484 | 0, // small_common_section_flags | |
10485 | 0, // large_common_section_flags | |
10486 | NULL, // attributes_section | |
10487 | NULL, // attributes_vendor | |
10488 | "__start" // entry_symbol_name | |
10489 | }; | |
10490 | ||
10491 | // The selector for mips object files. | |
10492 | ||
10493 | template<int size, bool big_endian> | |
10494 | class Target_selector_mips : public Target_selector | |
10495 | { | |
10496 | public: | |
10497 | Target_selector_mips() | |
10498 | : Target_selector(elfcpp::EM_MIPS, size, big_endian, | |
10499 | (size == 64 ? | |
10500 | (big_endian ? "elf64-tradbigmips" : "elf64-tradlittlemips") : | |
10501 | (big_endian ? "elf32-tradbigmips" : "elf32-tradlittlemips")), | |
10502 | (size == 64 ? | |
10503 | (big_endian ? "elf64-tradbigmips" : "elf64-tradlittlemips") : | |
10504 | (big_endian ? "elf32-tradbigmips" : "elf32-tradlittlemips"))) | |
10505 | { } | |
10506 | ||
10507 | Target* do_instantiate_target() | |
10508 | { return new Target_mips<size, big_endian>(); } | |
10509 | }; | |
10510 | ||
10511 | Target_selector_mips<32, true> target_selector_mips32be; | |
10512 | Target_selector_mips<32, false> target_selector_mips32; | |
10513 | Target_selector_mips<64, true> target_selector_mips64be; | |
10514 | Target_selector_mips<64, false> target_selector_mips64; | |
10515 | ||
10516 | ||
10517 | } // End anonymous namespace. |