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053a4d68 JY |
1 | // aarch64.cc -- aarch64 target support for gold. |
2 | ||
b90efa5b | 3 | // Copyright (C) 2014-2015 Free Software Foundation, Inc. |
9363c7c3 | 4 | // Written by Jing Yu <jingyu@google.com> and Han Shen <shenhan@google.com>. |
053a4d68 JY |
5 | |
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
23 | #include "gold.h" | |
24 | ||
25 | #include <cstring> | |
5019d64a | 26 | #include <map> |
a48d0c12 | 27 | #include <set> |
053a4d68 JY |
28 | |
29 | #include "elfcpp.h" | |
30 | #include "dwarf.h" | |
31 | #include "parameters.h" | |
32 | #include "reloc.h" | |
33 | #include "aarch64.h" | |
34 | #include "object.h" | |
35 | #include "symtab.h" | |
36 | #include "layout.h" | |
37 | #include "output.h" | |
38 | #include "copy-relocs.h" | |
39 | #include "target.h" | |
40 | #include "target-reloc.h" | |
41 | #include "target-select.h" | |
42 | #include "tls.h" | |
43 | #include "freebsd.h" | |
44 | #include "nacl.h" | |
45 | #include "gc.h" | |
46 | #include "icf.h" | |
9363c7c3 | 47 | #include "aarch64-reloc-property.h" |
053a4d68 JY |
48 | |
49 | // The first three .got.plt entries are reserved. | |
50 | const int32_t AARCH64_GOTPLT_RESERVE_COUNT = 3; | |
51 | ||
83a01957 | 52 | |
053a4d68 JY |
53 | namespace |
54 | { | |
55 | ||
56 | using namespace gold; | |
57 | ||
58 | template<int size, bool big_endian> | |
59 | class Output_data_plt_aarch64; | |
60 | ||
61 | template<int size, bool big_endian> | |
62 | class Output_data_plt_aarch64_standard; | |
63 | ||
64 | template<int size, bool big_endian> | |
65 | class Target_aarch64; | |
66 | ||
9363c7c3 JY |
67 | template<int size, bool big_endian> |
68 | class AArch64_relocate_functions; | |
69 | ||
5019d64a HS |
70 | // Utility class dealing with insns. This is ported from macros in |
71 | // bfd/elfnn-aarch64.cc, but wrapped inside a class as static members. This | |
72 | // class is used in erratum sequence scanning. | |
73 | ||
74 | template<bool big_endian> | |
75 | class AArch64_insn_utilities | |
76 | { | |
77 | public: | |
78 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
79 | ||
2f0c79aa HS |
80 | static const int BYTES_PER_INSN; |
81 | ||
82 | // Zero register encoding - 31. | |
83 | static const unsigned int AARCH64_ZR; | |
5019d64a HS |
84 | |
85 | static unsigned int | |
86 | aarch64_bit(Insntype insn, int pos) | |
87 | { return ((1 << pos) & insn) >> pos; } | |
88 | ||
89 | static unsigned int | |
90 | aarch64_bits(Insntype insn, int pos, int l) | |
91 | { return (insn >> pos) & ((1 << l) - 1); } | |
92 | ||
2f0c79aa HS |
93 | // Get the encoding field "op31" of 3-source data processing insns. "op31" is |
94 | // the name defined in armv8 insn manual C3.5.9. | |
95 | static unsigned int | |
96 | aarch64_op31(Insntype insn) | |
97 | { return aarch64_bits(insn, 21, 3); } | |
98 | ||
99 | // Get the encoding field "ra" of 3-source data processing insns. "ra" is the | |
100 | // third source register. See armv8 insn manual C3.5.9. | |
101 | static unsigned int | |
102 | aarch64_ra(Insntype insn) | |
103 | { return aarch64_bits(insn, 10, 5); } | |
104 | ||
0ef3814f HS |
105 | static bool |
106 | is_adr(const Insntype insn) | |
107 | { return (insn & 0x9F000000) == 0x10000000; } | |
108 | ||
5019d64a HS |
109 | static bool |
110 | is_adrp(const Insntype insn) | |
111 | { return (insn & 0x9F000000) == 0x90000000; } | |
112 | ||
113 | static unsigned int | |
114 | aarch64_rm(const Insntype insn) | |
115 | { return aarch64_bits(insn, 16, 5); } | |
116 | ||
117 | static unsigned int | |
118 | aarch64_rn(const Insntype insn) | |
119 | { return aarch64_bits(insn, 5, 5); } | |
120 | ||
121 | static unsigned int | |
122 | aarch64_rd(const Insntype insn) | |
123 | { return aarch64_bits(insn, 0, 5); } | |
124 | ||
125 | static unsigned int | |
126 | aarch64_rt(const Insntype insn) | |
127 | { return aarch64_bits(insn, 0, 5); } | |
128 | ||
129 | static unsigned int | |
130 | aarch64_rt2(const Insntype insn) | |
131 | { return aarch64_bits(insn, 10, 5); } | |
132 | ||
0ef3814f HS |
133 | // Encode imm21 into adr. Signed imm21 is in the range of [-1M, 1M). |
134 | static Insntype | |
135 | aarch64_adr_encode_imm(Insntype adr, int imm21) | |
136 | { | |
137 | gold_assert(is_adr(adr)); | |
138 | gold_assert(-(1 << 20) <= imm21 && imm21 < (1 << 20)); | |
139 | const int mask19 = (1 << 19) - 1; | |
140 | const int mask2 = 3; | |
141 | adr &= ~((mask19 << 5) | (mask2 << 29)); | |
142 | adr |= ((imm21 & mask2) << 29) | (((imm21 >> 2) & mask19) << 5); | |
143 | return adr; | |
144 | } | |
145 | ||
146 | // Retrieve encoded adrp 33-bit signed imm value. This value is obtained by | |
147 | // 21-bit signed imm encoded in the insn multiplied by 4k (page size) and | |
148 | // 64-bit sign-extended, resulting in [-4G, 4G) with 12-lsb being 0. | |
149 | static int64_t | |
150 | aarch64_adrp_decode_imm(const Insntype adrp) | |
151 | { | |
152 | const int mask19 = (1 << 19) - 1; | |
153 | const int mask2 = 3; | |
154 | gold_assert(is_adrp(adrp)); | |
155 | // 21-bit imm encoded in adrp. | |
156 | uint64_t imm = ((adrp >> 29) & mask2) | (((adrp >> 5) & mask19) << 2); | |
157 | // Retrieve msb of 21-bit-signed imm for sign extension. | |
158 | uint64_t msbt = (imm >> 20) & 1; | |
159 | // Real value is imm multipled by 4k. Value now has 33-bit information. | |
160 | int64_t value = imm << 12; | |
161 | // Sign extend to 64-bit by repeating msbt 31 (64-33) times and merge it | |
162 | // with value. | |
163 | return ((((uint64_t)(1) << 32) - msbt) << 33) | value; | |
164 | } | |
165 | ||
5019d64a HS |
166 | static bool |
167 | aarch64_b(const Insntype insn) | |
168 | { return (insn & 0xFC000000) == 0x14000000; } | |
169 | ||
170 | static bool | |
171 | aarch64_bl(const Insntype insn) | |
172 | { return (insn & 0xFC000000) == 0x94000000; } | |
173 | ||
174 | static bool | |
175 | aarch64_blr(const Insntype insn) | |
176 | { return (insn & 0xFFFFFC1F) == 0xD63F0000; } | |
177 | ||
178 | static bool | |
179 | aarch64_br(const Insntype insn) | |
180 | { return (insn & 0xFFFFFC1F) == 0xD61F0000; } | |
181 | ||
182 | // All ld/st ops. See C4-182 of the ARM ARM. The encoding space for | |
183 | // LD_PCREL, LDST_RO, LDST_UI and LDST_UIMM cover prefetch ops. | |
184 | static bool | |
185 | aarch64_ld(Insntype insn) { return aarch64_bit(insn, 22) == 1; } | |
186 | ||
187 | static bool | |
188 | aarch64_ldst(Insntype insn) | |
189 | { return (insn & 0x0a000000) == 0x08000000; } | |
190 | ||
191 | static bool | |
192 | aarch64_ldst_ex(Insntype insn) | |
193 | { return (insn & 0x3f000000) == 0x08000000; } | |
194 | ||
195 | static bool | |
196 | aarch64_ldst_pcrel(Insntype insn) | |
197 | { return (insn & 0x3b000000) == 0x18000000; } | |
198 | ||
199 | static bool | |
200 | aarch64_ldst_nap(Insntype insn) | |
201 | { return (insn & 0x3b800000) == 0x28000000; } | |
202 | ||
203 | static bool | |
204 | aarch64_ldstp_pi(Insntype insn) | |
205 | { return (insn & 0x3b800000) == 0x28800000; } | |
206 | ||
207 | static bool | |
208 | aarch64_ldstp_o(Insntype insn) | |
209 | { return (insn & 0x3b800000) == 0x29000000; } | |
210 | ||
211 | static bool | |
212 | aarch64_ldstp_pre(Insntype insn) | |
213 | { return (insn & 0x3b800000) == 0x29800000; } | |
214 | ||
215 | static bool | |
216 | aarch64_ldst_ui(Insntype insn) | |
217 | { return (insn & 0x3b200c00) == 0x38000000; } | |
218 | ||
219 | static bool | |
220 | aarch64_ldst_piimm(Insntype insn) | |
221 | { return (insn & 0x3b200c00) == 0x38000400; } | |
222 | ||
223 | static bool | |
224 | aarch64_ldst_u(Insntype insn) | |
225 | { return (insn & 0x3b200c00) == 0x38000800; } | |
226 | ||
227 | static bool | |
228 | aarch64_ldst_preimm(Insntype insn) | |
229 | { return (insn & 0x3b200c00) == 0x38000c00; } | |
230 | ||
231 | static bool | |
232 | aarch64_ldst_ro(Insntype insn) | |
233 | { return (insn & 0x3b200c00) == 0x38200800; } | |
234 | ||
235 | static bool | |
236 | aarch64_ldst_uimm(Insntype insn) | |
237 | { return (insn & 0x3b000000) == 0x39000000; } | |
238 | ||
239 | static bool | |
240 | aarch64_ldst_simd_m(Insntype insn) | |
241 | { return (insn & 0xbfbf0000) == 0x0c000000; } | |
242 | ||
243 | static bool | |
244 | aarch64_ldst_simd_m_pi(Insntype insn) | |
245 | { return (insn & 0xbfa00000) == 0x0c800000; } | |
246 | ||
247 | static bool | |
248 | aarch64_ldst_simd_s(Insntype insn) | |
249 | { return (insn & 0xbf9f0000) == 0x0d000000; } | |
250 | ||
251 | static bool | |
252 | aarch64_ldst_simd_s_pi(Insntype insn) | |
253 | { return (insn & 0xbf800000) == 0x0d800000; } | |
254 | ||
255 | // Classify an INSN if it is indeed a load/store. Return true if INSN is a | |
256 | // LD/ST instruction otherwise return false. For scalar LD/ST instructions | |
257 | // PAIR is FALSE, RT is returned and RT2 is set equal to RT. For LD/ST pair | |
258 | // instructions PAIR is TRUE, RT and RT2 are returned. | |
259 | static bool | |
260 | aarch64_mem_op_p(Insntype insn, unsigned int *rt, unsigned int *rt2, | |
261 | bool *pair, bool *load) | |
262 | { | |
263 | uint32_t opcode; | |
264 | unsigned int r; | |
265 | uint32_t opc = 0; | |
266 | uint32_t v = 0; | |
267 | uint32_t opc_v = 0; | |
268 | ||
269 | /* Bail out quickly if INSN doesn't fall into the the load-store | |
270 | encoding space. */ | |
271 | if (!aarch64_ldst (insn)) | |
272 | return false; | |
273 | ||
274 | *pair = false; | |
275 | *load = false; | |
276 | if (aarch64_ldst_ex (insn)) | |
277 | { | |
278 | *rt = aarch64_rt (insn); | |
279 | *rt2 = *rt; | |
280 | if (aarch64_bit (insn, 21) == 1) | |
281 | { | |
282 | *pair = true; | |
283 | *rt2 = aarch64_rt2 (insn); | |
284 | } | |
285 | *load = aarch64_ld (insn); | |
286 | return true; | |
287 | } | |
288 | else if (aarch64_ldst_nap (insn) | |
289 | || aarch64_ldstp_pi (insn) | |
290 | || aarch64_ldstp_o (insn) | |
291 | || aarch64_ldstp_pre (insn)) | |
292 | { | |
293 | *pair = true; | |
294 | *rt = aarch64_rt (insn); | |
295 | *rt2 = aarch64_rt2 (insn); | |
296 | *load = aarch64_ld (insn); | |
297 | return true; | |
298 | } | |
299 | else if (aarch64_ldst_pcrel (insn) | |
300 | || aarch64_ldst_ui (insn) | |
301 | || aarch64_ldst_piimm (insn) | |
302 | || aarch64_ldst_u (insn) | |
303 | || aarch64_ldst_preimm (insn) | |
304 | || aarch64_ldst_ro (insn) | |
305 | || aarch64_ldst_uimm (insn)) | |
306 | { | |
307 | *rt = aarch64_rt (insn); | |
308 | *rt2 = *rt; | |
309 | if (aarch64_ldst_pcrel (insn)) | |
310 | *load = true; | |
311 | opc = aarch64_bits (insn, 22, 2); | |
312 | v = aarch64_bit (insn, 26); | |
313 | opc_v = opc | (v << 2); | |
314 | *load = (opc_v == 1 || opc_v == 2 || opc_v == 3 | |
315 | || opc_v == 5 || opc_v == 7); | |
316 | return true; | |
317 | } | |
318 | else if (aarch64_ldst_simd_m (insn) | |
319 | || aarch64_ldst_simd_m_pi (insn)) | |
320 | { | |
321 | *rt = aarch64_rt (insn); | |
322 | *load = aarch64_bit (insn, 22); | |
323 | opcode = (insn >> 12) & 0xf; | |
324 | switch (opcode) | |
325 | { | |
326 | case 0: | |
327 | case 2: | |
328 | *rt2 = *rt + 3; | |
329 | break; | |
330 | ||
331 | case 4: | |
332 | case 6: | |
333 | *rt2 = *rt + 2; | |
334 | break; | |
335 | ||
336 | case 7: | |
337 | *rt2 = *rt; | |
338 | break; | |
339 | ||
340 | case 8: | |
341 | case 10: | |
342 | *rt2 = *rt + 1; | |
343 | break; | |
344 | ||
345 | default: | |
346 | return false; | |
347 | } | |
348 | return true; | |
349 | } | |
350 | else if (aarch64_ldst_simd_s (insn) | |
351 | || aarch64_ldst_simd_s_pi (insn)) | |
352 | { | |
353 | *rt = aarch64_rt (insn); | |
354 | r = (insn >> 21) & 1; | |
355 | *load = aarch64_bit (insn, 22); | |
356 | opcode = (insn >> 13) & 0x7; | |
357 | switch (opcode) | |
358 | { | |
359 | case 0: | |
360 | case 2: | |
361 | case 4: | |
362 | *rt2 = *rt + r; | |
363 | break; | |
364 | ||
365 | case 1: | |
366 | case 3: | |
367 | case 5: | |
368 | *rt2 = *rt + (r == 0 ? 2 : 3); | |
369 | break; | |
370 | ||
371 | case 6: | |
372 | *rt2 = *rt + r; | |
373 | break; | |
374 | ||
375 | case 7: | |
376 | *rt2 = *rt + (r == 0 ? 2 : 3); | |
377 | break; | |
378 | ||
379 | default: | |
380 | return false; | |
381 | } | |
382 | return true; | |
383 | } | |
384 | return false; | |
2f0c79aa HS |
385 | } // End of "aarch64_mem_op_p". |
386 | ||
387 | // Return true if INSN is mac insn. | |
388 | static bool | |
389 | aarch64_mac(Insntype insn) | |
390 | { return (insn & 0xff000000) == 0x9b000000; } | |
391 | ||
392 | // Return true if INSN is multiply-accumulate. | |
393 | // (This is similar to implementaton in elfnn-aarch64.c.) | |
394 | static bool | |
395 | aarch64_mlxl(Insntype insn) | |
396 | { | |
397 | uint32_t op31 = aarch64_op31(insn); | |
398 | if (aarch64_mac(insn) | |
399 | && (op31 == 0 || op31 == 1 || op31 == 5) | |
400 | /* Exclude MUL instructions which are encoded as a multiple-accumulate | |
401 | with RA = XZR. */ | |
402 | && aarch64_ra(insn) != AARCH64_ZR) | |
403 | { | |
404 | return true; | |
405 | } | |
406 | return false; | |
5019d64a | 407 | } |
2f0c79aa HS |
408 | }; // End of "AArch64_insn_utilities". |
409 | ||
410 | ||
411 | // Insn length in byte. | |
412 | ||
413 | template<bool big_endian> | |
414 | const int AArch64_insn_utilities<big_endian>::BYTES_PER_INSN = 4; | |
415 | ||
416 | ||
417 | // Zero register encoding - 31. | |
418 | ||
419 | template<bool big_endian> | |
420 | const unsigned int AArch64_insn_utilities<big_endian>::AARCH64_ZR = 0x1f; | |
5019d64a HS |
421 | |
422 | ||
053a4d68 JY |
423 | // Output_data_got_aarch64 class. |
424 | ||
425 | template<int size, bool big_endian> | |
426 | class Output_data_got_aarch64 : public Output_data_got<size, big_endian> | |
427 | { | |
428 | public: | |
429 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; | |
430 | Output_data_got_aarch64(Symbol_table* symtab, Layout* layout) | |
9363c7c3 JY |
431 | : Output_data_got<size, big_endian>(), |
432 | symbol_table_(symtab), layout_(layout) | |
053a4d68 JY |
433 | { } |
434 | ||
8e33481e HS |
435 | // Add a static entry for the GOT entry at OFFSET. GSYM is a global |
436 | // symbol and R_TYPE is the code of a dynamic relocation that needs to be | |
437 | // applied in a static link. | |
438 | void | |
439 | add_static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym) | |
440 | { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); } | |
441 | ||
442 | ||
443 | // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object | |
444 | // defining a local symbol with INDEX. R_TYPE is the code of a dynamic | |
445 | // relocation that needs to be applied in a static link. | |
446 | void | |
447 | add_static_reloc(unsigned int got_offset, unsigned int r_type, | |
448 | Sized_relobj_file<size, big_endian>* relobj, | |
449 | unsigned int index) | |
450 | { | |
451 | this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj, | |
452 | index)); | |
453 | } | |
454 | ||
455 | ||
053a4d68 JY |
456 | protected: |
457 | // Write out the GOT table. | |
458 | void | |
459 | do_write(Output_file* of) { | |
460 | // The first entry in the GOT is the address of the .dynamic section. | |
461 | gold_assert(this->data_size() >= size / 8); | |
462 | Output_section* dynamic = this->layout_->dynamic_section(); | |
463 | Valtype dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
464 | this->replace_constant(0, dynamic_addr); | |
465 | Output_data_got<size, big_endian>::do_write(of); | |
8e33481e HS |
466 | |
467 | // Handling static relocs | |
468 | if (this->static_relocs_.empty()) | |
469 | return; | |
470 | ||
471 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
472 | ||
473 | gold_assert(parameters->doing_static_link()); | |
474 | const off_t offset = this->offset(); | |
475 | const section_size_type oview_size = | |
476 | convert_to_section_size_type(this->data_size()); | |
477 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
478 | ||
479 | Output_segment* tls_segment = this->layout_->tls_segment(); | |
480 | gold_assert(tls_segment != NULL); | |
481 | ||
482 | AArch64_address aligned_tcb_address = | |
83a01957 | 483 | align_address(Target_aarch64<size, big_endian>::TCB_SIZE, |
8e33481e HS |
484 | tls_segment->maximum_alignment()); |
485 | ||
486 | for (size_t i = 0; i < this->static_relocs_.size(); ++i) | |
487 | { | |
488 | Static_reloc& reloc(this->static_relocs_[i]); | |
489 | AArch64_address value; | |
490 | ||
491 | if (!reloc.symbol_is_global()) | |
492 | { | |
493 | Sized_relobj_file<size, big_endian>* object = reloc.relobj(); | |
494 | const Symbol_value<size>* psymval = | |
495 | reloc.relobj()->local_symbol(reloc.index()); | |
496 | ||
497 | // We are doing static linking. Issue an error and skip this | |
498 | // relocation if the symbol is undefined or in a discarded_section. | |
499 | bool is_ordinary; | |
500 | unsigned int shndx = psymval->input_shndx(&is_ordinary); | |
501 | if ((shndx == elfcpp::SHN_UNDEF) | |
502 | || (is_ordinary | |
503 | && shndx != elfcpp::SHN_UNDEF | |
504 | && !object->is_section_included(shndx) | |
505 | && !this->symbol_table_->is_section_folded(object, shndx))) | |
506 | { | |
507 | gold_error(_("undefined or discarded local symbol %u from " | |
508 | " object %s in GOT"), | |
509 | reloc.index(), reloc.relobj()->name().c_str()); | |
510 | continue; | |
511 | } | |
512 | value = psymval->value(object, 0); | |
513 | } | |
514 | else | |
515 | { | |
516 | const Symbol* gsym = reloc.symbol(); | |
517 | gold_assert(gsym != NULL); | |
518 | if (gsym->is_forwarder()) | |
519 | gsym = this->symbol_table_->resolve_forwards(gsym); | |
520 | ||
521 | // We are doing static linking. Issue an error and skip this | |
522 | // relocation if the symbol is undefined or in a discarded_section | |
523 | // unless it is a weakly_undefined symbol. | |
524 | if ((gsym->is_defined_in_discarded_section() | |
525 | || gsym->is_undefined()) | |
526 | && !gsym->is_weak_undefined()) | |
527 | { | |
528 | gold_error(_("undefined or discarded symbol %s in GOT"), | |
529 | gsym->name()); | |
530 | continue; | |
531 | } | |
532 | ||
533 | if (!gsym->is_weak_undefined()) | |
534 | { | |
535 | const Sized_symbol<size>* sym = | |
536 | static_cast<const Sized_symbol<size>*>(gsym); | |
537 | value = sym->value(); | |
538 | } | |
539 | else | |
540 | value = 0; | |
541 | } | |
542 | ||
543 | unsigned got_offset = reloc.got_offset(); | |
544 | gold_assert(got_offset < oview_size); | |
545 | ||
546 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; | |
547 | Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset); | |
548 | Valtype x; | |
549 | switch (reloc.r_type()) | |
550 | { | |
551 | case elfcpp::R_AARCH64_TLS_DTPREL64: | |
552 | x = value; | |
553 | break; | |
554 | case elfcpp::R_AARCH64_TLS_TPREL64: | |
555 | x = value + aligned_tcb_address; | |
556 | break; | |
557 | default: | |
558 | gold_unreachable(); | |
559 | } | |
560 | elfcpp::Swap<size, big_endian>::writeval(wv, x); | |
561 | } | |
562 | ||
563 | of->write_output_view(offset, oview_size, oview); | |
053a4d68 JY |
564 | } |
565 | ||
566 | private: | |
9363c7c3 JY |
567 | // Symbol table of the output object. |
568 | Symbol_table* symbol_table_; | |
053a4d68 JY |
569 | // A pointer to the Layout class, so that we can find the .dynamic |
570 | // section when we write out the GOT section. | |
571 | Layout* layout_; | |
8e33481e | 572 | |
8e33481e HS |
573 | // This class represent dynamic relocations that need to be applied by |
574 | // gold because we are using TLS relocations in a static link. | |
575 | class Static_reloc | |
576 | { | |
577 | public: | |
578 | Static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym) | |
579 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true) | |
580 | { this->u_.global.symbol = gsym; } | |
581 | ||
582 | Static_reloc(unsigned int got_offset, unsigned int r_type, | |
583 | Sized_relobj_file<size, big_endian>* relobj, unsigned int index) | |
584 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false) | |
585 | { | |
586 | this->u_.local.relobj = relobj; | |
587 | this->u_.local.index = index; | |
588 | } | |
589 | ||
590 | // Return the GOT offset. | |
591 | unsigned int | |
592 | got_offset() const | |
593 | { return this->got_offset_; } | |
594 | ||
595 | // Relocation type. | |
596 | unsigned int | |
597 | r_type() const | |
598 | { return this->r_type_; } | |
599 | ||
600 | // Whether the symbol is global or not. | |
601 | bool | |
602 | symbol_is_global() const | |
603 | { return this->symbol_is_global_; } | |
604 | ||
605 | // For a relocation against a global symbol, the global symbol. | |
606 | Symbol* | |
607 | symbol() const | |
608 | { | |
609 | gold_assert(this->symbol_is_global_); | |
610 | return this->u_.global.symbol; | |
611 | } | |
612 | ||
613 | // For a relocation against a local symbol, the defining object. | |
614 | Sized_relobj_file<size, big_endian>* | |
615 | relobj() const | |
616 | { | |
617 | gold_assert(!this->symbol_is_global_); | |
618 | return this->u_.local.relobj; | |
619 | } | |
620 | ||
621 | // For a relocation against a local symbol, the local symbol index. | |
622 | unsigned int | |
623 | index() const | |
624 | { | |
625 | gold_assert(!this->symbol_is_global_); | |
626 | return this->u_.local.index; | |
627 | } | |
628 | ||
629 | private: | |
630 | // GOT offset of the entry to which this relocation is applied. | |
631 | unsigned int got_offset_; | |
632 | // Type of relocation. | |
633 | unsigned int r_type_; | |
634 | // Whether this relocation is against a global symbol. | |
635 | bool symbol_is_global_; | |
636 | // A global or local symbol. | |
637 | union | |
638 | { | |
83a01957 HS |
639 | struct |
640 | { | |
641 | // For a global symbol, the symbol itself. | |
642 | Symbol* symbol; | |
643 | } global; | |
644 | struct | |
645 | { | |
646 | // For a local symbol, the object defining the symbol. | |
647 | Sized_relobj_file<size, big_endian>* relobj; | |
648 | // For a local symbol, the symbol index. | |
649 | unsigned int index; | |
650 | } local; | |
651 | } u_; | |
652 | }; // End of inner class Static_reloc | |
653 | ||
654 | std::vector<Static_reloc> static_relocs_; | |
655 | }; // End of Output_data_got_aarch64 | |
656 | ||
657 | ||
658 | template<int size, bool big_endian> | |
659 | class AArch64_input_section; | |
660 | ||
661 | ||
662 | template<int size, bool big_endian> | |
663 | class AArch64_output_section; | |
664 | ||
665 | ||
83a01957 | 666 | template<int size, bool big_endian> |
a48d0c12 HS |
667 | class AArch64_relobj; |
668 | ||
669 | ||
670 | // Stub type enum constants. | |
671 | ||
672 | enum | |
83a01957 | 673 | { |
a48d0c12 | 674 | ST_NONE = 0, |
83a01957 | 675 | |
a48d0c12 HS |
676 | // Using adrp/add pair, 4 insns (including alignment) without mem access, |
677 | // the fastest stub. This has a limited jump distance, which is tested by | |
678 | // aarch64_valid_for_adrp_p. | |
679 | ST_ADRP_BRANCH = 1, | |
83a01957 | 680 | |
a48d0c12 HS |
681 | // Using ldr-absolute-address/br-register, 4 insns with 1 mem access, |
682 | // unlimited in jump distance. | |
683 | ST_LONG_BRANCH_ABS = 2, | |
83a01957 | 684 | |
a48d0c12 HS |
685 | // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1 |
686 | // mem access, slowest one. Only used in position independent executables. | |
687 | ST_LONG_BRANCH_PCREL = 3, | |
83a01957 | 688 | |
a48d0c12 HS |
689 | // Stub for erratum 843419 handling. |
690 | ST_E_843419 = 4, | |
83a01957 | 691 | |
2f0c79aa HS |
692 | // Stub for erratum 835769 handling. |
693 | ST_E_835769 = 5, | |
694 | ||
a48d0c12 | 695 | // Number of total stub types. |
2f0c79aa | 696 | ST_NUMBER = 6 |
a48d0c12 | 697 | }; |
83a01957 | 698 | |
83a01957 | 699 | |
a48d0c12 HS |
700 | // Struct that wraps insns for a particular stub. All stub templates are |
701 | // created/initialized as constants by Stub_template_repertoire. | |
83a01957 | 702 | |
a48d0c12 HS |
703 | template<bool big_endian> |
704 | struct Stub_template | |
705 | { | |
706 | const typename AArch64_insn_utilities<big_endian>::Insntype* insns; | |
707 | const int insn_num; | |
708 | }; | |
83a01957 | 709 | |
83a01957 | 710 | |
a48d0c12 HS |
711 | // Simple singleton class that creates/initializes/stores all types of stub |
712 | // templates. | |
713 | ||
714 | template<bool big_endian> | |
715 | class Stub_template_repertoire | |
716 | { | |
717 | public: | |
718 | typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype; | |
719 | ||
720 | // Single static method to get stub template for a given stub type. | |
721 | static const Stub_template<big_endian>* | |
722 | get_stub_template(int type) | |
83a01957 | 723 | { |
a48d0c12 HS |
724 | static Stub_template_repertoire<big_endian> singleton; |
725 | return singleton.stub_templates_[type]; | |
83a01957 HS |
726 | } |
727 | ||
a48d0c12 HS |
728 | private: |
729 | // Constructor - creates/initializes all stub templates. | |
730 | Stub_template_repertoire(); | |
731 | ~Stub_template_repertoire() | |
83a01957 HS |
732 | { } |
733 | ||
a48d0c12 HS |
734 | // Disallowing copy ctor and copy assignment operator. |
735 | Stub_template_repertoire(Stub_template_repertoire&); | |
736 | Stub_template_repertoire& operator=(Stub_template_repertoire&); | |
83a01957 | 737 | |
a48d0c12 HS |
738 | // Data that stores all insn templates. |
739 | const Stub_template<big_endian>* stub_templates_[ST_NUMBER]; | |
740 | }; // End of "class Stub_template_repertoire". | |
741 | ||
742 | ||
743 | // Constructor - creates/initilizes all stub templates. | |
744 | ||
745 | template<bool big_endian> | |
746 | Stub_template_repertoire<big_endian>::Stub_template_repertoire() | |
747 | { | |
748 | // Insn array definitions. | |
749 | const static Insntype ST_NONE_INSNS[] = {}; | |
750 | ||
751 | const static Insntype ST_ADRP_BRANCH_INSNS[] = | |
752 | { | |
753 | 0x90000010, /* adrp ip0, X */ | |
754 | /* ADR_PREL_PG_HI21(X) */ | |
755 | 0x91000210, /* add ip0, ip0, :lo12:X */ | |
756 | /* ADD_ABS_LO12_NC(X) */ | |
757 | 0xd61f0200, /* br ip0 */ | |
758 | 0x00000000, /* alignment padding */ | |
759 | }; | |
760 | ||
761 | const static Insntype ST_LONG_BRANCH_ABS_INSNS[] = | |
762 | { | |
763 | 0x58000050, /* ldr ip0, 0x8 */ | |
764 | 0xd61f0200, /* br ip0 */ | |
765 | 0x00000000, /* address field */ | |
766 | 0x00000000, /* address fields */ | |
767 | }; | |
768 | ||
769 | const static Insntype ST_LONG_BRANCH_PCREL_INSNS[] = | |
770 | { | |
771 | 0x58000090, /* ldr ip0, 0x10 */ | |
772 | 0x10000011, /* adr ip1, #0 */ | |
773 | 0x8b110210, /* add ip0, ip0, ip1 */ | |
774 | 0xd61f0200, /* br ip0 */ | |
775 | 0x00000000, /* address field */ | |
776 | 0x00000000, /* address field */ | |
777 | 0x00000000, /* alignment padding */ | |
778 | 0x00000000, /* alignment padding */ | |
779 | }; | |
780 | ||
781 | const static Insntype ST_E_843419_INSNS[] = | |
782 | { | |
783 | 0x00000000, /* Placeholder for erratum insn. */ | |
784 | 0x14000000, /* b <label> */ | |
785 | }; | |
786 | ||
2f0c79aa HS |
787 | // ST_E_835769 has the same stub template as ST_E_843419. |
788 | const static Insntype* ST_E_835769_INSNS = ST_E_843419_INSNS; | |
789 | ||
a48d0c12 HS |
790 | #define install_insn_template(T) \ |
791 | const static Stub_template<big_endian> template_##T = { \ | |
792 | T##_INSNS, sizeof(T##_INSNS) / sizeof(T##_INSNS[0]) }; \ | |
793 | this->stub_templates_[T] = &template_##T | |
794 | ||
795 | install_insn_template(ST_NONE); | |
796 | install_insn_template(ST_ADRP_BRANCH); | |
797 | install_insn_template(ST_LONG_BRANCH_ABS); | |
798 | install_insn_template(ST_LONG_BRANCH_PCREL); | |
799 | install_insn_template(ST_E_843419); | |
2f0c79aa | 800 | install_insn_template(ST_E_835769); |
a48d0c12 HS |
801 | |
802 | #undef install_insn_template | |
803 | } | |
804 | ||
805 | ||
806 | // Base class for stubs. | |
807 | ||
808 | template<int size, bool big_endian> | |
809 | class Stub_base | |
810 | { | |
811 | public: | |
812 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
813 | typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype; | |
814 | ||
815 | static const AArch64_address invalid_address = | |
816 | static_cast<AArch64_address>(-1); | |
817 | ||
818 | static const section_offset_type invalid_offset = | |
819 | static_cast<section_offset_type>(-1); | |
820 | ||
821 | Stub_base(int type) | |
822 | : destination_address_(invalid_address), | |
823 | offset_(invalid_offset), | |
824 | type_(type) | |
825 | {} | |
826 | ||
827 | ~Stub_base() | |
828 | {} | |
829 | ||
830 | // Get stub type. | |
831 | int | |
832 | type() const | |
833 | { return this->type_; } | |
834 | ||
835 | // Get stub template that provides stub insn information. | |
836 | const Stub_template<big_endian>* | |
837 | stub_template() const | |
83a01957 | 838 | { |
a48d0c12 HS |
839 | return Stub_template_repertoire<big_endian>:: |
840 | get_stub_template(this->type()); | |
83a01957 HS |
841 | } |
842 | ||
a48d0c12 | 843 | // Get destination address. |
83a01957 HS |
844 | AArch64_address |
845 | destination_address() const | |
846 | { | |
847 | gold_assert(this->destination_address_ != this->invalid_address); | |
848 | return this->destination_address_; | |
849 | } | |
850 | ||
851 | // Set destination address. | |
852 | void | |
853 | set_destination_address(AArch64_address address) | |
854 | { | |
855 | gold_assert(address != this->invalid_address); | |
856 | this->destination_address_ = address; | |
857 | } | |
858 | ||
859 | // Reset the destination address. | |
860 | void | |
861 | reset_destination_address() | |
862 | { this->destination_address_ = this->invalid_address; } | |
863 | ||
a48d0c12 HS |
864 | // Get offset of code stub. For Reloc_stub, it is the offset from the |
865 | // beginning of its containing stub table; for Erratum_stub, it is the offset | |
866 | // from the end of reloc_stubs. | |
867 | section_offset_type | |
868 | offset() const | |
869 | { | |
870 | gold_assert(this->offset_ != this->invalid_offset); | |
871 | return this->offset_; | |
872 | } | |
83a01957 | 873 | |
a48d0c12 HS |
874 | // Set stub offset. |
875 | void | |
876 | set_offset(section_offset_type offset) | |
877 | { this->offset_ = offset; } | |
83a01957 | 878 | |
a48d0c12 HS |
879 | // Return the stub insn. |
880 | const Insntype* | |
881 | insns() const | |
882 | { return this->stub_template()->insns; } | |
83a01957 | 883 | |
a48d0c12 HS |
884 | // Return num of stub insns. |
885 | unsigned int | |
886 | insn_num() const | |
887 | { return this->stub_template()->insn_num; } | |
888 | ||
889 | // Get size of the stub. | |
890 | int | |
891 | stub_size() const | |
892 | { | |
893 | return this->insn_num() * | |
894 | AArch64_insn_utilities<big_endian>::BYTES_PER_INSN; | |
895 | } | |
83a01957 HS |
896 | |
897 | // Write stub to output file. | |
898 | void | |
899 | write(unsigned char* view, section_size_type view_size) | |
900 | { this->do_write(view, view_size); } | |
901 | ||
a48d0c12 HS |
902 | protected: |
903 | // Abstract method to be implemented by sub-classes. | |
904 | virtual void | |
905 | do_write(unsigned char*, section_size_type) = 0; | |
906 | ||
907 | private: | |
908 | // The last insn of a stub is a jump to destination insn. This field records | |
909 | // the destination address. | |
910 | AArch64_address destination_address_; | |
911 | // The stub offset. Note this has difference interpretations between an | |
912 | // Reloc_stub and an Erratum_stub. For Reloc_stub this is the offset from the | |
913 | // beginning of the containing stub_table, whereas for Erratum_stub, this is | |
914 | // the offset from the end of reloc_stubs. | |
915 | section_offset_type offset_; | |
916 | // Stub type. | |
917 | const int type_; | |
918 | }; // End of "Stub_base". | |
919 | ||
920 | ||
921 | // Erratum stub class. An erratum stub differs from a reloc stub in that for | |
922 | // each erratum occurrence, we generate an erratum stub. We never share erratum | |
923 | // stubs, whereas for reloc stubs, different branches insns share a single reloc | |
924 | // stub as long as the branch targets are the same. (More to the point, reloc | |
925 | // stubs can be shared because they're used to reach a specific target, whereas | |
926 | // erratum stubs branch back to the original control flow.) | |
927 | ||
928 | template<int size, bool big_endian> | |
929 | class Erratum_stub : public Stub_base<size, big_endian> | |
930 | { | |
931 | public: | |
932 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; | |
933 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
56b06706 | 934 | typedef AArch64_insn_utilities<big_endian> Insn_utilities; |
a48d0c12 HS |
935 | typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype; |
936 | ||
5d7908e0 | 937 | static const int STUB_ADDR_ALIGN; |
a48d0c12 HS |
938 | |
939 | static const Insntype invalid_insn = static_cast<Insntype>(-1); | |
940 | ||
941 | Erratum_stub(The_aarch64_relobj* relobj, int type, | |
942 | unsigned shndx, unsigned int sh_offset) | |
943 | : Stub_base<size, big_endian>(type), relobj_(relobj), | |
944 | shndx_(shndx), sh_offset_(sh_offset), | |
945 | erratum_insn_(invalid_insn), | |
946 | erratum_address_(this->invalid_address) | |
947 | {} | |
948 | ||
949 | ~Erratum_stub() {} | |
950 | ||
951 | // Return the object that contains the erratum. | |
952 | The_aarch64_relobj* | |
953 | relobj() | |
954 | { return this->relobj_; } | |
955 | ||
956 | // Get section index of the erratum. | |
957 | unsigned int | |
958 | shndx() const | |
959 | { return this->shndx_; } | |
960 | ||
961 | // Get section offset of the erratum. | |
962 | unsigned int | |
963 | sh_offset() const | |
964 | { return this->sh_offset_; } | |
965 | ||
966 | // Get the erratum insn. This is the insn located at erratum_insn_address. | |
967 | Insntype | |
968 | erratum_insn() const | |
969 | { | |
970 | gold_assert(this->erratum_insn_ != this->invalid_insn); | |
971 | return this->erratum_insn_; | |
972 | } | |
973 | ||
974 | // Set the insn that the erratum happens to. | |
975 | void | |
976 | set_erratum_insn(Insntype insn) | |
977 | { this->erratum_insn_ = insn; } | |
978 | ||
56b06706 HS |
979 | // For 843419, the erratum insn is ld/st xt, [xn, #uimm], which may be a |
980 | // relocation spot, in this case, the erratum_insn_ recorded at scanning phase | |
981 | // is no longer the one we want to write out to the stub, update erratum_insn_ | |
982 | // with relocated version. Also note that in this case xn must not be "PC", so | |
983 | // it is safe to move the erratum insn from the origin place to the stub. For | |
984 | // 835769, the erratum insn is multiply-accumulate insn, which could not be a | |
985 | // relocation spot (assertion added though). | |
986 | void | |
987 | update_erratum_insn(Insntype insn) | |
988 | { | |
989 | gold_assert(this->erratum_insn_ != this->invalid_insn); | |
990 | switch (this->type()) | |
991 | { | |
992 | case ST_E_843419: | |
993 | gold_assert(Insn_utilities::aarch64_ldst_uimm(insn)); | |
994 | gold_assert(Insn_utilities::aarch64_ldst_uimm(this->erratum_insn())); | |
995 | gold_assert(Insn_utilities::aarch64_rd(insn) == | |
996 | Insn_utilities::aarch64_rd(this->erratum_insn())); | |
997 | gold_assert(Insn_utilities::aarch64_rn(insn) == | |
998 | Insn_utilities::aarch64_rn(this->erratum_insn())); | |
999 | // Update plain ld/st insn with relocated insn. | |
1000 | this->erratum_insn_ = insn; | |
1001 | break; | |
1002 | case ST_E_835769: | |
1003 | gold_assert(insn == this->erratum_insn()); | |
1004 | break; | |
1005 | default: | |
1006 | gold_unreachable(); | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | ||
a48d0c12 HS |
1011 | // Return the address where an erratum must be done. |
1012 | AArch64_address | |
1013 | erratum_address() const | |
1014 | { | |
1015 | gold_assert(this->erratum_address_ != this->invalid_address); | |
1016 | return this->erratum_address_; | |
1017 | } | |
1018 | ||
1019 | // Set the address where an erratum must be done. | |
1020 | void | |
1021 | set_erratum_address(AArch64_address addr) | |
1022 | { this->erratum_address_ = addr; } | |
1023 | ||
1024 | // Comparator used to group Erratum_stubs in a set by (obj, shndx, | |
1025 | // sh_offset). We do not include 'type' in the calculation, becuase there is | |
1026 | // at most one stub type at (obj, shndx, sh_offset). | |
1027 | bool | |
1028 | operator<(const Erratum_stub<size, big_endian>& k) const | |
1029 | { | |
1030 | if (this == &k) | |
1031 | return false; | |
1032 | // We group stubs by relobj. | |
1033 | if (this->relobj_ != k.relobj_) | |
1034 | return this->relobj_ < k.relobj_; | |
1035 | // Then by section index. | |
1036 | if (this->shndx_ != k.shndx_) | |
1037 | return this->shndx_ < k.shndx_; | |
1038 | // Lastly by section offset. | |
1039 | return this->sh_offset_ < k.sh_offset_; | |
1040 | } | |
1041 | ||
1042 | protected: | |
1043 | virtual void | |
1044 | do_write(unsigned char*, section_size_type); | |
1045 | ||
1046 | private: | |
1047 | // The object that needs to be fixed. | |
1048 | The_aarch64_relobj* relobj_; | |
1049 | // The shndx in the object that needs to be fixed. | |
1050 | const unsigned int shndx_; | |
1051 | // The section offset in the obejct that needs to be fixed. | |
1052 | const unsigned int sh_offset_; | |
1053 | // The insn to be fixed. | |
1054 | Insntype erratum_insn_; | |
1055 | // The address of the above insn. | |
1056 | AArch64_address erratum_address_; | |
1057 | }; // End of "Erratum_stub". | |
1058 | ||
0ef3814f HS |
1059 | |
1060 | // Erratum sub class to wrap additional info needed by 843419. In fixing this | |
1061 | // erratum, we may choose to replace 'adrp' with 'adr', in this case, we need | |
1062 | // adrp's code position (two or three insns before erratum insn itself). | |
1063 | ||
1064 | template<int size, bool big_endian> | |
1065 | class E843419_stub : public Erratum_stub<size, big_endian> | |
1066 | { | |
1067 | public: | |
1068 | typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype; | |
1069 | ||
1070 | E843419_stub(AArch64_relobj<size, big_endian>* relobj, | |
1071 | unsigned int shndx, unsigned int sh_offset, | |
1072 | unsigned int adrp_sh_offset) | |
1073 | : Erratum_stub<size, big_endian>(relobj, ST_E_843419, shndx, sh_offset), | |
1074 | adrp_sh_offset_(adrp_sh_offset) | |
1075 | {} | |
1076 | ||
1077 | unsigned int | |
1078 | adrp_sh_offset() const | |
1079 | { return this->adrp_sh_offset_; } | |
1080 | ||
1081 | private: | |
1082 | // Section offset of "adrp". (We do not need a "adrp_shndx_" field, because we | |
1083 | // can can obtain it from its parent.) | |
1084 | const unsigned int adrp_sh_offset_; | |
1085 | }; | |
1086 | ||
1087 | ||
5d7908e0 CC |
1088 | template<int size, bool big_endian> |
1089 | const int Erratum_stub<size, big_endian>::STUB_ADDR_ALIGN = 4; | |
a48d0c12 HS |
1090 | |
1091 | // Comparator used in set definition. | |
1092 | template<int size, bool big_endian> | |
1093 | struct Erratum_stub_less | |
1094 | { | |
1095 | bool | |
1096 | operator()(const Erratum_stub<size, big_endian>* s1, | |
1097 | const Erratum_stub<size, big_endian>* s2) const | |
1098 | { return *s1 < *s2; } | |
1099 | }; | |
1100 | ||
1101 | // Erratum_stub implementation for writing stub to output file. | |
1102 | ||
1103 | template<int size, bool big_endian> | |
1104 | void | |
1105 | Erratum_stub<size, big_endian>::do_write(unsigned char* view, section_size_type) | |
1106 | { | |
1107 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
1108 | const Insntype* insns = this->insns(); | |
1109 | uint32_t num_insns = this->insn_num(); | |
1110 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
2f0c79aa HS |
1111 | // For current implemented erratum 843419 and 835769, the first insn in the |
1112 | // stub is always a copy of the problematic insn (in 843419, the mem access | |
1113 | // insn, in 835769, the mac insn), followed by a jump-back. | |
a48d0c12 HS |
1114 | elfcpp::Swap<32, big_endian>::writeval(ip, this->erratum_insn()); |
1115 | for (uint32_t i = 1; i < num_insns; ++i) | |
1116 | elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]); | |
1117 | } | |
1118 | ||
1119 | ||
1120 | // Reloc stub class. | |
1121 | ||
1122 | template<int size, bool big_endian> | |
1123 | class Reloc_stub : public Stub_base<size, big_endian> | |
1124 | { | |
1125 | public: | |
1126 | typedef Reloc_stub<size, big_endian> This; | |
1127 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
1128 | ||
1129 | // Branch range. This is used to calculate the section group size, as well as | |
1130 | // determine whether a stub is needed. | |
1131 | static const int MAX_BRANCH_OFFSET = ((1 << 25) - 1) << 2; | |
1132 | static const int MIN_BRANCH_OFFSET = -((1 << 25) << 2); | |
1133 | ||
1134 | // Constant used to determine if an offset fits in the adrp instruction | |
1135 | // encoding. | |
1136 | static const int MAX_ADRP_IMM = (1 << 20) - 1; | |
1137 | static const int MIN_ADRP_IMM = -(1 << 20); | |
1138 | ||
1139 | static const int BYTES_PER_INSN = 4; | |
5d7908e0 | 1140 | static const int STUB_ADDR_ALIGN; |
a48d0c12 HS |
1141 | |
1142 | // Determine whether the offset fits in the jump/branch instruction. | |
1143 | static bool | |
1144 | aarch64_valid_branch_offset_p(int64_t offset) | |
1145 | { return offset >= MIN_BRANCH_OFFSET && offset <= MAX_BRANCH_OFFSET; } | |
1146 | ||
1147 | // Determine whether the offset fits in the adrp immediate field. | |
1148 | static bool | |
1149 | aarch64_valid_for_adrp_p(AArch64_address location, AArch64_address dest) | |
1150 | { | |
1151 | typedef AArch64_relocate_functions<size, big_endian> Reloc; | |
1152 | int64_t adrp_imm = (Reloc::Page(dest) - Reloc::Page(location)) >> 12; | |
1153 | return adrp_imm >= MIN_ADRP_IMM && adrp_imm <= MAX_ADRP_IMM; | |
1154 | } | |
1155 | ||
1156 | // Determine the stub type for a certain relocation or ST_NONE, if no stub is | |
1157 | // needed. | |
1158 | static int | |
1159 | stub_type_for_reloc(unsigned int r_type, AArch64_address address, | |
1160 | AArch64_address target); | |
1161 | ||
1162 | Reloc_stub(int type) | |
1163 | : Stub_base<size, big_endian>(type) | |
1164 | { } | |
1165 | ||
1166 | ~Reloc_stub() | |
1167 | { } | |
1168 | ||
83a01957 HS |
1169 | // The key class used to index the stub instance in the stub table's stub map. |
1170 | class Key | |
1171 | { | |
1172 | public: | |
a48d0c12 | 1173 | Key(int type, const Symbol* symbol, const Relobj* relobj, |
83a01957 | 1174 | unsigned int r_sym, int32_t addend) |
a48d0c12 | 1175 | : type_(type), addend_(addend) |
83a01957 HS |
1176 | { |
1177 | if (symbol != NULL) | |
1178 | { | |
1179 | this->r_sym_ = Reloc_stub::invalid_index; | |
1180 | this->u_.symbol = symbol; | |
1181 | } | |
1182 | else | |
1183 | { | |
1184 | gold_assert(relobj != NULL && r_sym != invalid_index); | |
1185 | this->r_sym_ = r_sym; | |
1186 | this->u_.relobj = relobj; | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | ~Key() | |
1191 | { } | |
1192 | ||
1193 | // Return stub type. | |
a48d0c12 HS |
1194 | int |
1195 | type() const | |
1196 | { return this->type_; } | |
83a01957 HS |
1197 | |
1198 | // Return the local symbol index or invalid_index. | |
1199 | unsigned int | |
1200 | r_sym() const | |
1201 | { return this->r_sym_; } | |
1202 | ||
1203 | // Return the symbol if there is one. | |
1204 | const Symbol* | |
1205 | symbol() const | |
1206 | { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; } | |
1207 | ||
1208 | // Return the relobj if there is one. | |
1209 | const Relobj* | |
1210 | relobj() const | |
1211 | { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; } | |
1212 | ||
1213 | // Whether this equals to another key k. | |
1214 | bool | |
1215 | eq(const Key& k) const | |
1216 | { | |
a48d0c12 | 1217 | return ((this->type_ == k.type_) |
83a01957 HS |
1218 | && (this->r_sym_ == k.r_sym_) |
1219 | && ((this->r_sym_ != Reloc_stub::invalid_index) | |
1220 | ? (this->u_.relobj == k.u_.relobj) | |
1221 | : (this->u_.symbol == k.u_.symbol)) | |
1222 | && (this->addend_ == k.addend_)); | |
1223 | } | |
1224 | ||
1225 | // Return a hash value. | |
1226 | size_t | |
1227 | hash_value() const | |
1228 | { | |
1229 | size_t name_hash_value = gold::string_hash<char>( | |
1230 | (this->r_sym_ != Reloc_stub::invalid_index) | |
1231 | ? this->u_.relobj->name().c_str() | |
1232 | : this->u_.symbol->name()); | |
1233 | // We only have 4 stub types. | |
a48d0c12 | 1234 | size_t stub_type_hash_value = 0x03 & this->type_; |
83a01957 HS |
1235 | return (name_hash_value |
1236 | ^ stub_type_hash_value | |
1237 | ^ ((this->r_sym_ & 0x3fff) << 2) | |
1238 | ^ ((this->addend_ & 0xffff) << 16)); | |
1239 | } | |
1240 | ||
1241 | // Functors for STL associative containers. | |
1242 | struct hash | |
1243 | { | |
1244 | size_t | |
1245 | operator()(const Key& k) const | |
1246 | { return k.hash_value(); } | |
1247 | }; | |
1248 | ||
1249 | struct equal_to | |
1250 | { | |
1251 | bool | |
1252 | operator()(const Key& k1, const Key& k2) const | |
1253 | { return k1.eq(k2); } | |
1254 | }; | |
1255 | ||
9726c3c1 | 1256 | private: |
83a01957 | 1257 | // Stub type. |
a48d0c12 | 1258 | const int type_; |
83a01957 HS |
1259 | // If this is a local symbol, this is the index in the defining object. |
1260 | // Otherwise, it is invalid_index for a global symbol. | |
1261 | unsigned int r_sym_; | |
1262 | // If r_sym_ is an invalid index, this points to a global symbol. | |
1263 | // Otherwise, it points to a relobj. We used the unsized and target | |
1264 | // independent Symbol and Relobj classes instead of Sized_symbol<32> and | |
1265 | // Arm_relobj, in order to avoid making the stub class a template | |
1266 | // as most of the stub machinery is endianness-neutral. However, it | |
1267 | // may require a bit of casting done by users of this class. | |
1268 | union | |
1269 | { | |
1270 | const Symbol* symbol; | |
1271 | const Relobj* relobj; | |
1272 | } u_; | |
1273 | // Addend associated with a reloc. | |
1274 | int32_t addend_; | |
1275 | }; // End of inner class Reloc_stub::Key | |
1276 | ||
1277 | protected: | |
1278 | // This may be overridden in the child class. | |
1279 | virtual void | |
1280 | do_write(unsigned char*, section_size_type); | |
1281 | ||
1282 | private: | |
83a01957 | 1283 | static const unsigned int invalid_index = static_cast<unsigned int>(-1); |
83a01957 HS |
1284 | }; // End of Reloc_stub |
1285 | ||
5d7908e0 CC |
1286 | template<int size, bool big_endian> |
1287 | const int Reloc_stub<size, big_endian>::STUB_ADDR_ALIGN = 4; | |
83a01957 HS |
1288 | |
1289 | // Write data to output file. | |
1290 | ||
1291 | template<int size, bool big_endian> | |
1292 | void | |
1293 | Reloc_stub<size, big_endian>:: | |
1294 | do_write(unsigned char* view, section_size_type) | |
1295 | { | |
1296 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
a48d0c12 HS |
1297 | const uint32_t* insns = this->insns(); |
1298 | uint32_t num_insns = this->insn_num(); | |
83a01957 | 1299 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
a48d0c12 HS |
1300 | for (uint32_t i = 0; i < num_insns; ++i) |
1301 | elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]); | |
83a01957 HS |
1302 | } |
1303 | ||
1304 | ||
83a01957 HS |
1305 | // Determine the stub type for a certain relocation or ST_NONE, if no stub is |
1306 | // needed. | |
1307 | ||
1308 | template<int size, bool big_endian> | |
a48d0c12 | 1309 | inline int |
83a01957 HS |
1310 | Reloc_stub<size, big_endian>::stub_type_for_reloc( |
1311 | unsigned int r_type, AArch64_address location, AArch64_address dest) | |
1312 | { | |
1313 | int64_t branch_offset = 0; | |
1314 | switch(r_type) | |
1315 | { | |
1316 | case elfcpp::R_AARCH64_CALL26: | |
1317 | case elfcpp::R_AARCH64_JUMP26: | |
1318 | branch_offset = dest - location; | |
1319 | break; | |
1320 | default: | |
9726c3c1 | 1321 | gold_unreachable(); |
83a01957 HS |
1322 | } |
1323 | ||
1324 | if (aarch64_valid_branch_offset_p(branch_offset)) | |
1325 | return ST_NONE; | |
1326 | ||
1327 | if (aarch64_valid_for_adrp_p(location, dest)) | |
1328 | return ST_ADRP_BRANCH; | |
1329 | ||
1330 | if (parameters->options().output_is_position_independent() | |
1331 | && parameters->options().output_is_executable()) | |
1332 | return ST_LONG_BRANCH_PCREL; | |
1333 | ||
1334 | return ST_LONG_BRANCH_ABS; | |
1335 | } | |
1336 | ||
1337 | // A class to hold stubs for the ARM target. | |
1338 | ||
1339 | template<int size, bool big_endian> | |
1340 | class Stub_table : public Output_data | |
1341 | { | |
1342 | public: | |
1343 | typedef Target_aarch64<size, big_endian> The_target_aarch64; | |
1344 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
a48d0c12 | 1345 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
83a01957 HS |
1346 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; |
1347 | typedef Reloc_stub<size, big_endian> The_reloc_stub; | |
1348 | typedef typename The_reloc_stub::Key The_reloc_stub_key; | |
a48d0c12 HS |
1349 | typedef Erratum_stub<size, big_endian> The_erratum_stub; |
1350 | typedef Erratum_stub_less<size, big_endian> The_erratum_stub_less; | |
83a01957 HS |
1351 | typedef typename The_reloc_stub_key::hash The_reloc_stub_key_hash; |
1352 | typedef typename The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to; | |
1353 | typedef Stub_table<size, big_endian> The_stub_table; | |
1354 | typedef Unordered_map<The_reloc_stub_key, The_reloc_stub*, | |
1355 | The_reloc_stub_key_hash, The_reloc_stub_key_equal_to> | |
1356 | Reloc_stub_map; | |
1357 | typedef typename Reloc_stub_map::const_iterator Reloc_stub_map_const_iter; | |
1358 | typedef Relocate_info<size, big_endian> The_relocate_info; | |
1359 | ||
a48d0c12 HS |
1360 | typedef std::set<The_erratum_stub*, The_erratum_stub_less> Erratum_stub_set; |
1361 | typedef typename Erratum_stub_set::iterator Erratum_stub_set_iter; | |
1362 | ||
83a01957 | 1363 | Stub_table(The_aarch64_input_section* owner) |
a48d0c12 HS |
1364 | : Output_data(), owner_(owner), reloc_stubs_size_(0), |
1365 | erratum_stubs_size_(0), prev_data_size_(0) | |
83a01957 HS |
1366 | { } |
1367 | ||
1368 | ~Stub_table() | |
1369 | { } | |
1370 | ||
1371 | The_aarch64_input_section* | |
1372 | owner() const | |
1373 | { return owner_; } | |
1374 | ||
1375 | // Whether this stub table is empty. | |
1376 | bool | |
1377 | empty() const | |
a48d0c12 | 1378 | { return reloc_stubs_.empty() && erratum_stubs_.empty(); } |
83a01957 HS |
1379 | |
1380 | // Return the current data size. | |
1381 | off_t | |
1382 | current_data_size() const | |
1383 | { return this->current_data_size_for_child(); } | |
1384 | ||
1385 | // Add a STUB using KEY. The caller is responsible for avoiding addition | |
1386 | // if a STUB with the same key has already been added. | |
1387 | void | |
1388 | add_reloc_stub(The_reloc_stub* stub, const The_reloc_stub_key& key); | |
1389 | ||
a48d0c12 HS |
1390 | // Add an erratum stub into the erratum stub set. The set is ordered by |
1391 | // (relobj, shndx, sh_offset). | |
1392 | void | |
1393 | add_erratum_stub(The_erratum_stub* stub); | |
1394 | ||
1395 | // Find if such erratum exists for any given (obj, shndx, sh_offset). | |
1396 | The_erratum_stub* | |
1397 | find_erratum_stub(The_aarch64_relobj* a64relobj, | |
1398 | unsigned int shndx, unsigned int sh_offset); | |
1399 | ||
1400 | // Find all the erratums for a given input section. The return value is a pair | |
1401 | // of iterators [begin, end). | |
1402 | std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter> | |
1403 | find_erratum_stubs_for_input_section(The_aarch64_relobj* a64relobj, | |
1404 | unsigned int shndx); | |
1405 | ||
1406 | // Compute the erratum stub address. | |
1407 | AArch64_address | |
1408 | erratum_stub_address(The_erratum_stub* stub) const | |
1409 | { | |
1410 | AArch64_address r = align_address(this->address() + this->reloc_stubs_size_, | |
1411 | The_erratum_stub::STUB_ADDR_ALIGN); | |
1412 | r += stub->offset(); | |
1413 | return r; | |
1414 | } | |
1415 | ||
83a01957 HS |
1416 | // Finalize stubs. No-op here, just for completeness. |
1417 | void | |
1418 | finalize_stubs() | |
1419 | { } | |
1420 | ||
1421 | // Look up a relocation stub using KEY. Return NULL if there is none. | |
1422 | The_reloc_stub* | |
1423 | find_reloc_stub(The_reloc_stub_key& key) | |
1424 | { | |
1425 | Reloc_stub_map_const_iter p = this->reloc_stubs_.find(key); | |
1426 | return (p != this->reloc_stubs_.end()) ? p->second : NULL; | |
1427 | } | |
1428 | ||
1429 | // Relocate stubs in this stub table. | |
1430 | void | |
1431 | relocate_stubs(const The_relocate_info*, | |
1432 | The_target_aarch64*, | |
1433 | Output_section*, | |
1434 | unsigned char*, | |
1435 | AArch64_address, | |
1436 | section_size_type); | |
1437 | ||
1438 | // Update data size at the end of a relaxation pass. Return true if data size | |
1439 | // is different from that of the previous relaxation pass. | |
1440 | bool | |
1441 | update_data_size_changed_p() | |
1442 | { | |
1443 | // No addralign changed here. | |
a48d0c12 HS |
1444 | off_t s = align_address(this->reloc_stubs_size_, |
1445 | The_erratum_stub::STUB_ADDR_ALIGN) | |
1446 | + this->erratum_stubs_size_; | |
83a01957 HS |
1447 | bool changed = (s != this->prev_data_size_); |
1448 | this->prev_data_size_ = s; | |
1449 | return changed; | |
1450 | } | |
1451 | ||
1452 | protected: | |
1453 | // Write out section contents. | |
1454 | void | |
1455 | do_write(Output_file*); | |
1456 | ||
1457 | // Return the required alignment. | |
1458 | uint64_t | |
1459 | do_addralign() const | |
a48d0c12 HS |
1460 | { |
1461 | return std::max(The_reloc_stub::STUB_ADDR_ALIGN, | |
1462 | The_erratum_stub::STUB_ADDR_ALIGN); | |
1463 | } | |
83a01957 HS |
1464 | |
1465 | // Reset address and file offset. | |
1466 | void | |
1467 | do_reset_address_and_file_offset() | |
1468 | { this->set_current_data_size_for_child(this->prev_data_size_); } | |
1469 | ||
1470 | // Set final data size. | |
1471 | void | |
1472 | set_final_data_size() | |
1473 | { this->set_data_size(this->current_data_size()); } | |
1474 | ||
1475 | private: | |
1476 | // Relocate one stub. | |
1477 | void | |
1478 | relocate_stub(The_reloc_stub*, | |
1479 | const The_relocate_info*, | |
1480 | The_target_aarch64*, | |
1481 | Output_section*, | |
1482 | unsigned char*, | |
1483 | AArch64_address, | |
1484 | section_size_type); | |
1485 | ||
1486 | private: | |
1487 | // Owner of this stub table. | |
1488 | The_aarch64_input_section* owner_; | |
1489 | // The relocation stubs. | |
1490 | Reloc_stub_map reloc_stubs_; | |
a48d0c12 HS |
1491 | // The erratum stubs. |
1492 | Erratum_stub_set erratum_stubs_; | |
83a01957 HS |
1493 | // Size of reloc stubs. |
1494 | off_t reloc_stubs_size_; | |
a48d0c12 HS |
1495 | // Size of erratum stubs. |
1496 | off_t erratum_stubs_size_; | |
83a01957 HS |
1497 | // data size of this in the previous pass. |
1498 | off_t prev_data_size_; | |
1499 | }; // End of Stub_table | |
1500 | ||
1501 | ||
a48d0c12 HS |
1502 | // Add an erratum stub into the erratum stub set. The set is ordered by |
1503 | // (relobj, shndx, sh_offset). | |
1504 | ||
1505 | template<int size, bool big_endian> | |
1506 | void | |
1507 | Stub_table<size, big_endian>::add_erratum_stub(The_erratum_stub* stub) | |
1508 | { | |
1509 | std::pair<Erratum_stub_set_iter, bool> ret = | |
1510 | this->erratum_stubs_.insert(stub); | |
1511 | gold_assert(ret.second); | |
1512 | this->erratum_stubs_size_ = align_address( | |
1513 | this->erratum_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN); | |
1514 | stub->set_offset(this->erratum_stubs_size_); | |
1515 | this->erratum_stubs_size_ += stub->stub_size(); | |
1516 | } | |
1517 | ||
1518 | ||
56b06706 | 1519 | // Find if such erratum exists for given (obj, shndx, sh_offset). |
a48d0c12 HS |
1520 | |
1521 | template<int size, bool big_endian> | |
1522 | Erratum_stub<size, big_endian>* | |
1523 | Stub_table<size, big_endian>::find_erratum_stub( | |
1524 | The_aarch64_relobj* a64relobj, unsigned int shndx, unsigned int sh_offset) | |
1525 | { | |
1526 | // A dummy object used as key to search in the set. | |
1527 | The_erratum_stub key(a64relobj, ST_NONE, | |
1528 | shndx, sh_offset); | |
1529 | Erratum_stub_set_iter i = this->erratum_stubs_.find(&key); | |
1530 | if (i != this->erratum_stubs_.end()) | |
1531 | { | |
1532 | The_erratum_stub* stub(*i); | |
1533 | gold_assert(stub->erratum_insn() != 0); | |
1534 | return stub; | |
1535 | } | |
1536 | return NULL; | |
1537 | } | |
1538 | ||
1539 | ||
1540 | // Find all the errata for a given input section. The return value is a pair of | |
1541 | // iterators [begin, end). | |
1542 | ||
1543 | template<int size, bool big_endian> | |
1544 | std::pair<typename Stub_table<size, big_endian>::Erratum_stub_set_iter, | |
1545 | typename Stub_table<size, big_endian>::Erratum_stub_set_iter> | |
1546 | Stub_table<size, big_endian>::find_erratum_stubs_for_input_section( | |
1547 | The_aarch64_relobj* a64relobj, unsigned int shndx) | |
1548 | { | |
1549 | typedef std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter> Result_pair; | |
1550 | Erratum_stub_set_iter start, end; | |
1551 | The_erratum_stub low_key(a64relobj, ST_NONE, shndx, 0); | |
1552 | start = this->erratum_stubs_.lower_bound(&low_key); | |
1553 | if (start == this->erratum_stubs_.end()) | |
1554 | return Result_pair(this->erratum_stubs_.end(), | |
1555 | this->erratum_stubs_.end()); | |
1556 | end = start; | |
1557 | while (end != this->erratum_stubs_.end() && | |
1558 | (*end)->relobj() == a64relobj && (*end)->shndx() == shndx) | |
1559 | ++end; | |
1560 | return Result_pair(start, end); | |
1561 | } | |
1562 | ||
1563 | ||
83a01957 HS |
1564 | // Add a STUB using KEY. The caller is responsible for avoiding addition |
1565 | // if a STUB with the same key has already been added. | |
1566 | ||
1567 | template<int size, bool big_endian> | |
1568 | void | |
1569 | Stub_table<size, big_endian>::add_reloc_stub( | |
1570 | The_reloc_stub* stub, const The_reloc_stub_key& key) | |
1571 | { | |
a48d0c12 | 1572 | gold_assert(stub->type() == key.type()); |
83a01957 HS |
1573 | this->reloc_stubs_[key] = stub; |
1574 | ||
1575 | // Assign stub offset early. We can do this because we never remove | |
1576 | // reloc stubs and they are in the beginning of the stub table. | |
1577 | this->reloc_stubs_size_ = align_address(this->reloc_stubs_size_, | |
1578 | The_reloc_stub::STUB_ADDR_ALIGN); | |
1579 | stub->set_offset(this->reloc_stubs_size_); | |
1580 | this->reloc_stubs_size_ += stub->stub_size(); | |
1581 | } | |
1582 | ||
1583 | ||
1584 | // Relocate all stubs in this stub table. | |
1585 | ||
1586 | template<int size, bool big_endian> | |
1587 | void | |
1588 | Stub_table<size, big_endian>:: | |
1589 | relocate_stubs(const The_relocate_info* relinfo, | |
1590 | The_target_aarch64* target_aarch64, | |
1591 | Output_section* output_section, | |
1592 | unsigned char* view, | |
1593 | AArch64_address address, | |
1594 | section_size_type view_size) | |
1595 | { | |
1596 | // "view_size" is the total size of the stub_table. | |
1597 | gold_assert(address == this->address() && | |
1598 | view_size == static_cast<section_size_type>(this->data_size())); | |
1599 | for(Reloc_stub_map_const_iter p = this->reloc_stubs_.begin(); | |
1600 | p != this->reloc_stubs_.end(); ++p) | |
1601 | relocate_stub(p->second, relinfo, target_aarch64, output_section, | |
1602 | view, address, view_size); | |
a48d0c12 HS |
1603 | |
1604 | // Just for convenience. | |
1605 | const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN; | |
1606 | ||
1607 | // Now 'relocate' erratum stubs. | |
1608 | for(Erratum_stub_set_iter i = this->erratum_stubs_.begin(); | |
1609 | i != this->erratum_stubs_.end(); ++i) | |
1610 | { | |
1611 | AArch64_address stub_address = this->erratum_stub_address(*i); | |
1612 | // The address of "b" in the stub that is to be "relocated". | |
1613 | AArch64_address stub_b_insn_address; | |
1614 | // Branch offset that is to be filled in "b" insn. | |
1615 | int b_offset = 0; | |
1616 | switch ((*i)->type()) | |
1617 | { | |
1618 | case ST_E_843419: | |
2f0c79aa | 1619 | case ST_E_835769: |
56b06706 HS |
1620 | // The 1st insn of the erratum could be a relocation spot, |
1621 | // in this case we need to fix it with | |
1622 | // "(*i)->erratum_insn()". | |
1623 | elfcpp::Swap<32, big_endian>::writeval( | |
1624 | view + (stub_address - this->address()), | |
1625 | (*i)->erratum_insn()); | |
a48d0c12 HS |
1626 | // For the erratum, the 2nd insn is a b-insn to be patched |
1627 | // (relocated). | |
1628 | stub_b_insn_address = stub_address + 1 * BPI; | |
1629 | b_offset = (*i)->destination_address() - stub_b_insn_address; | |
1630 | AArch64_relocate_functions<size, big_endian>::construct_b( | |
1631 | view + (stub_b_insn_address - this->address()), | |
1632 | ((unsigned int)(b_offset)) & 0xfffffff); | |
1633 | break; | |
1634 | default: | |
1635 | gold_unreachable(); | |
1636 | break; | |
1637 | } | |
1638 | } | |
83a01957 HS |
1639 | } |
1640 | ||
1641 | ||
1642 | // Relocate one stub. This is a helper for Stub_table::relocate_stubs(). | |
1643 | ||
1644 | template<int size, bool big_endian> | |
1645 | void | |
1646 | Stub_table<size, big_endian>:: | |
1647 | relocate_stub(The_reloc_stub* stub, | |
1648 | const The_relocate_info* relinfo, | |
1649 | The_target_aarch64* target_aarch64, | |
1650 | Output_section* output_section, | |
1651 | unsigned char* view, | |
1652 | AArch64_address address, | |
1653 | section_size_type view_size) | |
1654 | { | |
1655 | // "offset" is the offset from the beginning of the stub_table. | |
1656 | section_size_type offset = stub->offset(); | |
1657 | section_size_type stub_size = stub->stub_size(); | |
1658 | // "view_size" is the total size of the stub_table. | |
1659 | gold_assert(offset + stub_size <= view_size); | |
1660 | ||
1661 | target_aarch64->relocate_stub(stub, relinfo, output_section, | |
1662 | view + offset, address + offset, view_size); | |
1663 | } | |
1664 | ||
1665 | ||
1666 | // Write out the stubs to file. | |
1667 | ||
1668 | template<int size, bool big_endian> | |
1669 | void | |
1670 | Stub_table<size, big_endian>::do_write(Output_file* of) | |
1671 | { | |
1672 | off_t offset = this->offset(); | |
1673 | const section_size_type oview_size = | |
1674 | convert_to_section_size_type(this->data_size()); | |
1675 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
1676 | ||
1677 | // Write relocation stubs. | |
1678 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
1679 | p != this->reloc_stubs_.end(); ++p) | |
1680 | { | |
1681 | The_reloc_stub* stub = p->second; | |
1682 | AArch64_address address = this->address() + stub->offset(); | |
1683 | gold_assert(address == | |
1684 | align_address(address, The_reloc_stub::STUB_ADDR_ALIGN)); | |
1685 | stub->write(oview + stub->offset(), stub->stub_size()); | |
1686 | } | |
1687 | ||
a48d0c12 HS |
1688 | // Write erratum stubs. |
1689 | unsigned int erratum_stub_start_offset = | |
1690 | align_address(this->reloc_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN); | |
1691 | for (typename Erratum_stub_set::iterator p = this->erratum_stubs_.begin(); | |
1692 | p != this->erratum_stubs_.end(); ++p) | |
1693 | { | |
1694 | The_erratum_stub* stub(*p); | |
1695 | stub->write(oview + erratum_stub_start_offset + stub->offset(), | |
1696 | stub->stub_size()); | |
1697 | } | |
1698 | ||
83a01957 HS |
1699 | of->write_output_view(this->offset(), oview_size, oview); |
1700 | } | |
1701 | ||
1702 | ||
1703 | // AArch64_relobj class. | |
1704 | ||
1705 | template<int size, bool big_endian> | |
1706 | class AArch64_relobj : public Sized_relobj_file<size, big_endian> | |
1707 | { | |
1708 | public: | |
1709 | typedef AArch64_relobj<size, big_endian> This; | |
1710 | typedef Target_aarch64<size, big_endian> The_target_aarch64; | |
1711 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; | |
1712 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
1713 | typedef Stub_table<size, big_endian> The_stub_table; | |
a48d0c12 HS |
1714 | typedef Erratum_stub<size, big_endian> The_erratum_stub; |
1715 | typedef typename The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter; | |
83a01957 HS |
1716 | typedef std::vector<The_stub_table*> Stub_table_list; |
1717 | static const AArch64_address invalid_address = | |
1718 | static_cast<AArch64_address>(-1); | |
1719 | ||
1720 | AArch64_relobj(const std::string& name, Input_file* input_file, off_t offset, | |
1721 | const typename elfcpp::Ehdr<size, big_endian>& ehdr) | |
1722 | : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr), | |
1723 | stub_tables_() | |
1724 | { } | |
1725 | ||
1726 | ~AArch64_relobj() | |
1727 | { } | |
1728 | ||
1729 | // Return the stub table of the SHNDX-th section if there is one. | |
1730 | The_stub_table* | |
1731 | stub_table(unsigned int shndx) const | |
1732 | { | |
1733 | gold_assert(shndx < this->stub_tables_.size()); | |
1734 | return this->stub_tables_[shndx]; | |
1735 | } | |
1736 | ||
1737 | // Set STUB_TABLE to be the stub_table of the SHNDX-th section. | |
1738 | void | |
1739 | set_stub_table(unsigned int shndx, The_stub_table* stub_table) | |
1740 | { | |
1741 | gold_assert(shndx < this->stub_tables_.size()); | |
1742 | this->stub_tables_[shndx] = stub_table; | |
1743 | } | |
1744 | ||
2f0c79aa | 1745 | // Entrance to errata scanning. |
5019d64a | 1746 | void |
2f0c79aa HS |
1747 | scan_errata(unsigned int shndx, |
1748 | const elfcpp::Shdr<size, big_endian>&, | |
1749 | Output_section*, const Symbol_table*, | |
1750 | The_target_aarch64*); | |
5019d64a HS |
1751 | |
1752 | // Scan all relocation sections for stub generation. | |
83a01957 HS |
1753 | void |
1754 | scan_sections_for_stubs(The_target_aarch64*, const Symbol_table*, | |
1755 | const Layout*); | |
1756 | ||
1757 | // Whether a section is a scannable text section. | |
1758 | bool | |
1759 | text_section_is_scannable(const elfcpp::Shdr<size, big_endian>&, unsigned int, | |
1760 | const Output_section*, const Symbol_table*); | |
1761 | ||
1762 | // Convert regular input section with index SHNDX to a relaxed section. | |
1763 | void | |
1764 | convert_input_section_to_relaxed_section(unsigned /* shndx */) | |
1765 | { | |
1766 | // The stubs have relocations and we need to process them after writing | |
1767 | // out the stubs. So relocation now must follow section write. | |
1768 | this->set_relocs_must_follow_section_writes(); | |
1769 | } | |
1770 | ||
5019d64a HS |
1771 | // Structure for mapping symbol position. |
1772 | struct Mapping_symbol_position | |
1773 | { | |
1774 | Mapping_symbol_position(unsigned int shndx, AArch64_address offset): | |
1775 | shndx_(shndx), offset_(offset) | |
1776 | {} | |
1777 | ||
1778 | // "<" comparator used in ordered_map container. | |
1779 | bool | |
1780 | operator<(const Mapping_symbol_position& p) const | |
1781 | { | |
1782 | return (this->shndx_ < p.shndx_ | |
1783 | || (this->shndx_ == p.shndx_ && this->offset_ < p.offset_)); | |
1784 | } | |
1785 | ||
1786 | // Section index. | |
1787 | unsigned int shndx_; | |
1788 | ||
1789 | // Section offset. | |
1790 | AArch64_address offset_; | |
1791 | }; | |
1792 | ||
1793 | typedef std::map<Mapping_symbol_position, char> Mapping_symbol_info; | |
1794 | ||
83a01957 HS |
1795 | protected: |
1796 | // Post constructor setup. | |
1797 | void | |
1798 | do_setup() | |
1799 | { | |
1800 | // Call parent's setup method. | |
1801 | Sized_relobj_file<size, big_endian>::do_setup(); | |
1802 | ||
1803 | // Initialize look-up tables. | |
1804 | this->stub_tables_.resize(this->shnum()); | |
1805 | } | |
1806 | ||
1807 | virtual void | |
1808 | do_relocate_sections( | |
1809 | const Symbol_table* symtab, const Layout* layout, | |
1810 | const unsigned char* pshdrs, Output_file* of, | |
1811 | typename Sized_relobj_file<size, big_endian>::Views* pviews); | |
1812 | ||
5019d64a HS |
1813 | // Count local symbols and (optionally) record mapping info. |
1814 | virtual void | |
1815 | do_count_local_symbols(Stringpool_template<char>*, | |
1816 | Stringpool_template<char>*); | |
1817 | ||
83a01957 | 1818 | private: |
a48d0c12 HS |
1819 | // Fix all errata in the object. |
1820 | void | |
1821 | fix_errata(typename Sized_relobj_file<size, big_endian>::Views* pviews); | |
1822 | ||
0ef3814f HS |
1823 | // Try to fix erratum 843419 in an optimized way. Return true if patch is |
1824 | // applied. | |
1825 | bool | |
1826 | try_fix_erratum_843419_optimized( | |
1827 | The_erratum_stub*, | |
1828 | typename Sized_relobj_file<size, big_endian>::View_size&); | |
1829 | ||
83a01957 HS |
1830 | // Whether a section needs to be scanned for relocation stubs. |
1831 | bool | |
1832 | section_needs_reloc_stub_scanning(const elfcpp::Shdr<size, big_endian>&, | |
1833 | const Relobj::Output_sections&, | |
1834 | const Symbol_table*, const unsigned char*); | |
1835 | ||
1836 | // List of stub tables. | |
1837 | Stub_table_list stub_tables_; | |
5019d64a HS |
1838 | |
1839 | // Mapping symbol information sorted by (section index, section_offset). | |
1840 | Mapping_symbol_info mapping_symbol_info_; | |
83a01957 HS |
1841 | }; // End of AArch64_relobj |
1842 | ||
1843 | ||
5019d64a HS |
1844 | // Override to record mapping symbol information. |
1845 | template<int size, bool big_endian> | |
1846 | void | |
1847 | AArch64_relobj<size, big_endian>::do_count_local_symbols( | |
1848 | Stringpool_template<char>* pool, Stringpool_template<char>* dynpool) | |
1849 | { | |
1850 | Sized_relobj_file<size, big_endian>::do_count_local_symbols(pool, dynpool); | |
1851 | ||
1852 | // Only erratum-fixing work needs mapping symbols, so skip this time consuming | |
1853 | // processing if not fixing erratum. | |
2f0c79aa HS |
1854 | if (!parameters->options().fix_cortex_a53_843419() |
1855 | && !parameters->options().fix_cortex_a53_835769()) | |
5019d64a HS |
1856 | return; |
1857 | ||
1858 | const unsigned int loccount = this->local_symbol_count(); | |
1859 | if (loccount == 0) | |
1860 | return; | |
1861 | ||
1862 | // Read the symbol table section header. | |
1863 | const unsigned int symtab_shndx = this->symtab_shndx(); | |
1864 | elfcpp::Shdr<size, big_endian> | |
1865 | symtabshdr(this, this->elf_file()->section_header(symtab_shndx)); | |
1866 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); | |
1867 | ||
1868 | // Read the local symbols. | |
1869 | const int sym_size =elfcpp::Elf_sizes<size>::sym_size; | |
1870 | gold_assert(loccount == symtabshdr.get_sh_info()); | |
1871 | off_t locsize = loccount * sym_size; | |
1872 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), | |
1873 | locsize, true, true); | |
1874 | ||
1875 | // For mapping symbol processing, we need to read the symbol names. | |
1876 | unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link()); | |
1877 | if (strtab_shndx >= this->shnum()) | |
1878 | { | |
1879 | this->error(_("invalid symbol table name index: %u"), strtab_shndx); | |
1880 | return; | |
1881 | } | |
1882 | ||
1883 | elfcpp::Shdr<size, big_endian> | |
1884 | strtabshdr(this, this->elf_file()->section_header(strtab_shndx)); | |
1885 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) | |
1886 | { | |
1887 | this->error(_("symbol table name section has wrong type: %u"), | |
1888 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
1889 | return; | |
1890 | } | |
1891 | ||
1892 | const char* pnames = | |
1893 | reinterpret_cast<const char*>(this->get_view(strtabshdr.get_sh_offset(), | |
1894 | strtabshdr.get_sh_size(), | |
1895 | false, false)); | |
1896 | ||
1897 | // Skip the first dummy symbol. | |
1898 | psyms += sym_size; | |
1899 | typename Sized_relobj_file<size, big_endian>::Local_values* | |
1900 | plocal_values = this->local_values(); | |
1901 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) | |
1902 | { | |
1903 | elfcpp::Sym<size, big_endian> sym(psyms); | |
1904 | Symbol_value<size>& lv((*plocal_values)[i]); | |
1905 | AArch64_address input_value = lv.input_value(); | |
1906 | ||
b91deca9 HS |
1907 | // Check to see if this is a mapping symbol. AArch64 mapping symbols are |
1908 | // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping | |
1909 | // symbols. | |
1910 | // Mapping symbols could be one of the following 4 forms - | |
1911 | // a) $x | |
1912 | // b) $x.<any...> | |
1913 | // c) $d | |
1914 | // d) $d.<any...> | |
5019d64a HS |
1915 | const char* sym_name = pnames + sym.get_st_name(); |
1916 | if (sym_name[0] == '$' && (sym_name[1] == 'x' || sym_name[1] == 'd') | |
b91deca9 | 1917 | && (sym_name[2] == '\0' || sym_name[2] == '.')) |
5019d64a HS |
1918 | { |
1919 | bool is_ordinary; | |
1920 | unsigned int input_shndx = | |
1921 | this->adjust_sym_shndx(i, sym.get_st_shndx(), &is_ordinary); | |
1922 | gold_assert(is_ordinary); | |
1923 | ||
1924 | Mapping_symbol_position msp(input_shndx, input_value); | |
1925 | // Insert mapping_symbol_info into map whose ordering is defined by | |
1926 | // (shndx, offset_within_section). | |
1927 | this->mapping_symbol_info_[msp] = sym_name[1]; | |
1928 | } | |
1929 | } | |
1930 | } | |
1931 | ||
1932 | ||
a48d0c12 HS |
1933 | // Fix all errata in the object. |
1934 | ||
1935 | template<int size, bool big_endian> | |
1936 | void | |
1937 | AArch64_relobj<size, big_endian>::fix_errata( | |
1938 | typename Sized_relobj_file<size, big_endian>::Views* pviews) | |
1939 | { | |
1940 | typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype; | |
1941 | unsigned int shnum = this->shnum(); | |
1942 | for (unsigned int i = 1; i < shnum; ++i) | |
1943 | { | |
1944 | The_stub_table* stub_table = this->stub_table(i); | |
1945 | if (!stub_table) | |
1946 | continue; | |
1947 | std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter> | |
1948 | ipair(stub_table->find_erratum_stubs_for_input_section(this, i)); | |
1949 | Erratum_stub_set_iter p = ipair.first, end = ipair.second; | |
1950 | while (p != end) | |
1951 | { | |
1952 | The_erratum_stub* stub = *p; | |
1953 | typename Sized_relobj_file<size, big_endian>::View_size& | |
1954 | pview((*pviews)[i]); | |
1955 | ||
1956 | // Double check data before fix. | |
56b06706 HS |
1957 | gold_assert(pview.address + stub->sh_offset() |
1958 | == stub->erratum_address()); | |
1959 | ||
1960 | // Update previously recorded erratum insn with relocated | |
1961 | // version. | |
a48d0c12 HS |
1962 | Insntype* ip = |
1963 | reinterpret_cast<Insntype*>(pview.view + stub->sh_offset()); | |
1964 | Insntype insn_to_fix = ip[0]; | |
56b06706 | 1965 | stub->update_erratum_insn(insn_to_fix); |
a48d0c12 | 1966 | |
0ef3814f HS |
1967 | // First try to see if erratum is 843419 and if it can be fixed |
1968 | // without using branch-to-stub. | |
1969 | if (!try_fix_erratum_843419_optimized(stub, pview)) | |
1970 | { | |
1971 | // Replace the erratum insn with a branch-to-stub. | |
1972 | AArch64_address stub_address = | |
1973 | stub_table->erratum_stub_address(stub); | |
1974 | unsigned int b_offset = stub_address - stub->erratum_address(); | |
1975 | AArch64_relocate_functions<size, big_endian>::construct_b( | |
1976 | pview.view + stub->sh_offset(), b_offset & 0xfffffff); | |
1977 | } | |
a48d0c12 HS |
1978 | ++p; |
1979 | } | |
1980 | } | |
1981 | } | |
1982 | ||
1983 | ||
0ef3814f HS |
1984 | // This is an optimization for 843419. This erratum requires the sequence begin |
1985 | // with 'adrp', when final value calculated by adrp fits in adr, we can just | |
1986 | // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however, | |
1987 | // in this case, we do not delete the erratum stub (too late to do so), it is | |
1988 | // merely generated without ever being called.) | |
1989 | ||
1990 | template<int size, bool big_endian> | |
1991 | bool | |
1992 | AArch64_relobj<size, big_endian>::try_fix_erratum_843419_optimized( | |
1993 | The_erratum_stub* stub, | |
1994 | typename Sized_relobj_file<size, big_endian>::View_size& pview) | |
1995 | { | |
1996 | if (stub->type() != ST_E_843419) | |
1997 | return false; | |
1998 | ||
1999 | typedef AArch64_insn_utilities<big_endian> Insn_utilities; | |
2000 | typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype; | |
2001 | E843419_stub<size, big_endian>* e843419_stub = | |
2002 | reinterpret_cast<E843419_stub<size, big_endian>*>(stub); | |
2003 | AArch64_address pc = pview.address + e843419_stub->adrp_sh_offset(); | |
2004 | Insntype* adrp_view = reinterpret_cast<Insntype*>( | |
2005 | pview.view + e843419_stub->adrp_sh_offset()); | |
2006 | Insntype adrp_insn = adrp_view[0]; | |
2007 | gold_assert(Insn_utilities::is_adrp(adrp_insn)); | |
2008 | // Get adrp 33-bit signed imm value. | |
2009 | int64_t adrp_imm = Insn_utilities:: | |
2010 | aarch64_adrp_decode_imm(adrp_insn); | |
2011 | // adrp - final value transferred to target register is calculated as: | |
2012 | // PC[11:0] = Zeros(12) | |
2013 | // adrp_dest_value = PC + adrp_imm; | |
2014 | int64_t adrp_dest_value = (pc & ~((1 << 12) - 1)) + adrp_imm; | |
2015 | // adr -final value transferred to target register is calucalted as: | |
2016 | // PC + adr_imm | |
2017 | // So we have: | |
2018 | // PC + adr_imm = adrp_dest_value | |
2019 | // ==> | |
2020 | // adr_imm = adrp_dest_value - PC | |
2021 | int64_t adr_imm = adrp_dest_value - pc; | |
2022 | // Check if imm fits in adr (21-bit signed). | |
2023 | if (-(1 << 20) <= adr_imm && adr_imm < (1 << 20)) | |
2024 | { | |
2025 | // Convert 'adrp' into 'adr'. | |
f945ba50 | 2026 | Insntype adr_insn = adrp_insn & ((1u << 31) - 1); |
0ef3814f HS |
2027 | adr_insn = Insn_utilities:: |
2028 | aarch64_adr_encode_imm(adr_insn, adr_imm); | |
2029 | elfcpp::Swap<32, big_endian>::writeval(adrp_view, adr_insn); | |
2030 | return true; | |
2031 | } | |
2032 | return false; | |
2033 | } | |
2034 | ||
2035 | ||
83a01957 HS |
2036 | // Relocate sections. |
2037 | ||
2038 | template<int size, bool big_endian> | |
2039 | void | |
2040 | AArch64_relobj<size, big_endian>::do_relocate_sections( | |
2041 | const Symbol_table* symtab, const Layout* layout, | |
2042 | const unsigned char* pshdrs, Output_file* of, | |
2043 | typename Sized_relobj_file<size, big_endian>::Views* pviews) | |
2044 | { | |
2045 | // Call parent to relocate sections. | |
2046 | Sized_relobj_file<size, big_endian>::do_relocate_sections(symtab, layout, | |
2047 | pshdrs, of, pviews); | |
2048 | ||
2049 | // We do not generate stubs if doing a relocatable link. | |
2050 | if (parameters->options().relocatable()) | |
2051 | return; | |
2052 | ||
2f0c79aa HS |
2053 | if (parameters->options().fix_cortex_a53_843419() |
2054 | || parameters->options().fix_cortex_a53_835769()) | |
a48d0c12 HS |
2055 | this->fix_errata(pviews); |
2056 | ||
83a01957 HS |
2057 | Relocate_info<size, big_endian> relinfo; |
2058 | relinfo.symtab = symtab; | |
2059 | relinfo.layout = layout; | |
2060 | relinfo.object = this; | |
2061 | ||
2062 | // Relocate stub tables. | |
2063 | unsigned int shnum = this->shnum(); | |
2064 | The_target_aarch64* target = The_target_aarch64::current_target(); | |
2065 | ||
2066 | for (unsigned int i = 1; i < shnum; ++i) | |
2067 | { | |
2068 | The_aarch64_input_section* aarch64_input_section = | |
2069 | target->find_aarch64_input_section(this, i); | |
2070 | if (aarch64_input_section != NULL | |
2071 | && aarch64_input_section->is_stub_table_owner() | |
2072 | && !aarch64_input_section->stub_table()->empty()) | |
2073 | { | |
2074 | Output_section* os = this->output_section(i); | |
2075 | gold_assert(os != NULL); | |
2076 | ||
2077 | relinfo.reloc_shndx = elfcpp::SHN_UNDEF; | |
2078 | relinfo.reloc_shdr = NULL; | |
2079 | relinfo.data_shndx = i; | |
2080 | relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<size>::shdr_size; | |
2081 | ||
2082 | typename Sized_relobj_file<size, big_endian>::View_size& | |
2083 | view_struct = (*pviews)[i]; | |
2084 | gold_assert(view_struct.view != NULL); | |
2085 | ||
2086 | The_stub_table* stub_table = aarch64_input_section->stub_table(); | |
2087 | off_t offset = stub_table->address() - view_struct.address; | |
2088 | unsigned char* view = view_struct.view + offset; | |
2089 | AArch64_address address = stub_table->address(); | |
2090 | section_size_type view_size = stub_table->data_size(); | |
2091 | stub_table->relocate_stubs(&relinfo, target, os, view, address, | |
2092 | view_size); | |
2093 | } | |
2094 | } | |
2095 | } | |
2096 | ||
2097 | ||
2098 | // Determine if an input section is scannable for stub processing. SHDR is | |
2099 | // the header of the section and SHNDX is the section index. OS is the output | |
2100 | // section for the input section and SYMTAB is the global symbol table used to | |
2101 | // look up ICF information. | |
2102 | ||
2103 | template<int size, bool big_endian> | |
2104 | bool | |
2105 | AArch64_relobj<size, big_endian>::text_section_is_scannable( | |
2106 | const elfcpp::Shdr<size, big_endian>& text_shdr, | |
2107 | unsigned int text_shndx, | |
2108 | const Output_section* os, | |
2109 | const Symbol_table* symtab) | |
2110 | { | |
2111 | // Skip any empty sections, unallocated sections or sections whose | |
2112 | // type are not SHT_PROGBITS. | |
2113 | if (text_shdr.get_sh_size() == 0 | |
2114 | || (text_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0 | |
2115 | || text_shdr.get_sh_type() != elfcpp::SHT_PROGBITS) | |
2116 | return false; | |
2117 | ||
2118 | // Skip any discarded or ICF'ed sections. | |
2119 | if (os == NULL || symtab->is_section_folded(this, text_shndx)) | |
2120 | return false; | |
2121 | ||
2122 | // Skip exception frame. | |
2123 | if (strcmp(os->name(), ".eh_frame") == 0) | |
2124 | return false ; | |
2125 | ||
2126 | gold_assert(!this->is_output_section_offset_invalid(text_shndx) || | |
2127 | os->find_relaxed_input_section(this, text_shndx) != NULL); | |
2128 | ||
2129 | return true; | |
2130 | } | |
2131 | ||
2132 | ||
2133 | // Determine if we want to scan the SHNDX-th section for relocation stubs. | |
2134 | // This is a helper for AArch64_relobj::scan_sections_for_stubs(). | |
2135 | ||
2136 | template<int size, bool big_endian> | |
2137 | bool | |
2138 | AArch64_relobj<size, big_endian>::section_needs_reloc_stub_scanning( | |
2139 | const elfcpp::Shdr<size, big_endian>& shdr, | |
2140 | const Relobj::Output_sections& out_sections, | |
2141 | const Symbol_table* symtab, | |
2142 | const unsigned char* pshdrs) | |
2143 | { | |
2144 | unsigned int sh_type = shdr.get_sh_type(); | |
2145 | if (sh_type != elfcpp::SHT_RELA) | |
2146 | return false; | |
2147 | ||
2148 | // Ignore empty section. | |
2149 | off_t sh_size = shdr.get_sh_size(); | |
2150 | if (sh_size == 0) | |
2151 | return false; | |
2152 | ||
2153 | // Ignore reloc section with unexpected symbol table. The | |
2154 | // error will be reported in the final link. | |
2155 | if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx()) | |
2156 | return false; | |
2157 | ||
2158 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2159 | unsigned int reloc_size = elfcpp::Elf_sizes<size>::rela_size; | |
2160 | ||
2161 | // Ignore reloc section with unexpected entsize or uneven size. | |
2162 | // The error will be reported in the final link. | |
2163 | if (reloc_size != shdr.get_sh_entsize() || sh_size % reloc_size != 0) | |
2164 | return false; | |
2165 | ||
2166 | // Ignore reloc section with bad info. This error will be | |
2167 | // reported in the final link. | |
2168 | unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_info()); | |
2169 | if (text_shndx >= this->shnum()) | |
2170 | return false; | |
2171 | ||
2172 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
2173 | const elfcpp::Shdr<size, big_endian> text_shdr(pshdrs + | |
2174 | text_shndx * shdr_size); | |
2175 | return this->text_section_is_scannable(text_shdr, text_shndx, | |
2176 | out_sections[text_shndx], symtab); | |
2177 | } | |
2178 | ||
2179 | ||
2f0c79aa | 2180 | // Scan section SHNDX for erratum 843419 and 835769. |
5019d64a HS |
2181 | |
2182 | template<int size, bool big_endian> | |
2183 | void | |
2f0c79aa | 2184 | AArch64_relobj<size, big_endian>::scan_errata( |
5019d64a HS |
2185 | unsigned int shndx, const elfcpp::Shdr<size, big_endian>& shdr, |
2186 | Output_section* os, const Symbol_table* symtab, | |
2187 | The_target_aarch64* target) | |
2188 | { | |
2189 | if (shdr.get_sh_size() == 0 | |
2190 | || (shdr.get_sh_flags() & | |
2191 | (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) == 0 | |
2192 | || shdr.get_sh_type() != elfcpp::SHT_PROGBITS) | |
2193 | return; | |
2194 | ||
2195 | if (!os || symtab->is_section_folded(this, shndx)) return; | |
2196 | ||
2197 | AArch64_address output_offset = this->get_output_section_offset(shndx); | |
2198 | AArch64_address output_address; | |
2199 | if (output_offset != invalid_address) | |
2200 | output_address = os->address() + output_offset; | |
2201 | else | |
2202 | { | |
2203 | const Output_relaxed_input_section* poris = | |
2204 | os->find_relaxed_input_section(this, shndx); | |
2205 | if (!poris) return; | |
2206 | output_address = poris->address(); | |
2207 | } | |
2208 | ||
2209 | section_size_type input_view_size = 0; | |
2210 | const unsigned char* input_view = | |
2211 | this->section_contents(shndx, &input_view_size, false); | |
2212 | ||
2213 | Mapping_symbol_position section_start(shndx, 0); | |
2214 | // Find the first mapping symbol record within section shndx. | |
2215 | typename Mapping_symbol_info::const_iterator p = | |
2216 | this->mapping_symbol_info_.lower_bound(section_start); | |
5019d64a HS |
2217 | while (p != this->mapping_symbol_info_.end() && |
2218 | p->first.shndx_ == shndx) | |
2219 | { | |
2220 | typename Mapping_symbol_info::const_iterator prev = p; | |
2221 | ++p; | |
2222 | if (prev->second == 'x') | |
2223 | { | |
2224 | section_size_type span_start = | |
2225 | convert_to_section_size_type(prev->first.offset_); | |
2226 | section_size_type span_end; | |
2227 | if (p != this->mapping_symbol_info_.end() | |
2228 | && p->first.shndx_ == shndx) | |
2229 | span_end = convert_to_section_size_type(p->first.offset_); | |
2230 | else | |
2231 | span_end = convert_to_section_size_type(shdr.get_sh_size()); | |
2f0c79aa HS |
2232 | |
2233 | // Here we do not share the scanning code of both errata. For 843419, | |
2234 | // only the last few insns of each page are examined, which is fast, | |
2235 | // whereas, for 835769, every insn pair needs to be checked. | |
2236 | ||
2237 | if (parameters->options().fix_cortex_a53_843419()) | |
2238 | target->scan_erratum_843419_span( | |
2239 | this, shndx, span_start, span_end, | |
2240 | const_cast<unsigned char*>(input_view), output_address); | |
2241 | ||
2242 | if (parameters->options().fix_cortex_a53_835769()) | |
2243 | target->scan_erratum_835769_span( | |
5019d64a HS |
2244 | this, shndx, span_start, span_end, |
2245 | const_cast<unsigned char*>(input_view), output_address); | |
2246 | } | |
2247 | } | |
2248 | } | |
2249 | ||
2250 | ||
83a01957 HS |
2251 | // Scan relocations for stub generation. |
2252 | ||
2253 | template<int size, bool big_endian> | |
2254 | void | |
2255 | AArch64_relobj<size, big_endian>::scan_sections_for_stubs( | |
2256 | The_target_aarch64* target, | |
2257 | const Symbol_table* symtab, | |
2258 | const Layout* layout) | |
2259 | { | |
2260 | unsigned int shnum = this->shnum(); | |
2261 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
2262 | ||
2263 | // Read the section headers. | |
2264 | const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(), | |
2265 | shnum * shdr_size, | |
2266 | true, true); | |
2267 | ||
2268 | // To speed up processing, we set up hash tables for fast lookup of | |
2269 | // input offsets to output addresses. | |
2270 | this->initialize_input_to_output_maps(); | |
2271 | ||
2272 | const Relobj::Output_sections& out_sections(this->output_sections()); | |
2273 | ||
2274 | Relocate_info<size, big_endian> relinfo; | |
2275 | relinfo.symtab = symtab; | |
2276 | relinfo.layout = layout; | |
2277 | relinfo.object = this; | |
2278 | ||
2279 | // Do relocation stubs scanning. | |
2280 | const unsigned char* p = pshdrs + shdr_size; | |
2281 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) | |
2282 | { | |
2283 | const elfcpp::Shdr<size, big_endian> shdr(p); | |
2f0c79aa HS |
2284 | if (parameters->options().fix_cortex_a53_843419() |
2285 | || parameters->options().fix_cortex_a53_835769()) | |
2286 | scan_errata(i, shdr, out_sections[i], symtab, target); | |
83a01957 HS |
2287 | if (this->section_needs_reloc_stub_scanning(shdr, out_sections, symtab, |
2288 | pshdrs)) | |
2289 | { | |
2290 | unsigned int index = this->adjust_shndx(shdr.get_sh_info()); | |
2291 | AArch64_address output_offset = | |
2292 | this->get_output_section_offset(index); | |
2293 | AArch64_address output_address; | |
2294 | if (output_offset != invalid_address) | |
2295 | { | |
2296 | output_address = out_sections[index]->address() + output_offset; | |
2297 | } | |
2298 | else | |
2299 | { | |
2300 | // Currently this only happens for a relaxed section. | |
2301 | const Output_relaxed_input_section* poris = | |
2302 | out_sections[index]->find_relaxed_input_section(this, index); | |
2303 | gold_assert(poris != NULL); | |
2304 | output_address = poris->address(); | |
2305 | } | |
2306 | ||
2307 | // Get the relocations. | |
2308 | const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(), | |
2309 | shdr.get_sh_size(), | |
2310 | true, false); | |
2311 | ||
2312 | // Get the section contents. | |
2313 | section_size_type input_view_size = 0; | |
2314 | const unsigned char* input_view = | |
2315 | this->section_contents(index, &input_view_size, false); | |
2316 | ||
2317 | relinfo.reloc_shndx = i; | |
2318 | relinfo.data_shndx = index; | |
2319 | unsigned int sh_type = shdr.get_sh_type(); | |
2320 | unsigned int reloc_size; | |
2321 | gold_assert (sh_type == elfcpp::SHT_RELA); | |
2322 | reloc_size = elfcpp::Elf_sizes<size>::rela_size; | |
2323 | ||
2324 | Output_section* os = out_sections[index]; | |
2325 | target->scan_section_for_stubs(&relinfo, sh_type, prelocs, | |
2326 | shdr.get_sh_size() / reloc_size, | |
2327 | os, | |
2328 | output_offset == invalid_address, | |
2329 | input_view, output_address, | |
2330 | input_view_size); | |
2331 | } | |
2332 | } | |
2333 | } | |
2334 | ||
2335 | ||
2336 | // A class to wrap an ordinary input section containing executable code. | |
2337 | ||
2338 | template<int size, bool big_endian> | |
2339 | class AArch64_input_section : public Output_relaxed_input_section | |
2340 | { | |
2341 | public: | |
2342 | typedef Stub_table<size, big_endian> The_stub_table; | |
2343 | ||
2344 | AArch64_input_section(Relobj* relobj, unsigned int shndx) | |
2345 | : Output_relaxed_input_section(relobj, shndx, 1), | |
2346 | stub_table_(NULL), | |
2347 | original_contents_(NULL), original_size_(0), | |
2348 | original_addralign_(1) | |
2349 | { } | |
2350 | ||
2351 | ~AArch64_input_section() | |
2352 | { delete[] this->original_contents_; } | |
2353 | ||
2354 | // Initialize. | |
2355 | void | |
2356 | init(); | |
2357 | ||
2358 | // Set the stub_table. | |
2359 | void | |
2360 | set_stub_table(The_stub_table* st) | |
2361 | { this->stub_table_ = st; } | |
2362 | ||
2363 | // Whether this is a stub table owner. | |
2364 | bool | |
2365 | is_stub_table_owner() const | |
2366 | { return this->stub_table_ != NULL && this->stub_table_->owner() == this; } | |
2367 | ||
2368 | // Return the original size of the section. | |
2369 | uint32_t | |
2370 | original_size() const | |
2371 | { return this->original_size_; } | |
2372 | ||
2373 | // Return the stub table. | |
2374 | The_stub_table* | |
2375 | stub_table() | |
2376 | { return stub_table_; } | |
2377 | ||
2378 | protected: | |
2379 | // Write out this input section. | |
2380 | void | |
2381 | do_write(Output_file*); | |
2382 | ||
2383 | // Return required alignment of this. | |
2384 | uint64_t | |
2385 | do_addralign() const | |
2386 | { | |
2387 | if (this->is_stub_table_owner()) | |
2388 | return std::max(this->stub_table_->addralign(), | |
2389 | static_cast<uint64_t>(this->original_addralign_)); | |
2390 | else | |
2391 | return this->original_addralign_; | |
2392 | } | |
2393 | ||
2394 | // Finalize data size. | |
2395 | void | |
2396 | set_final_data_size(); | |
2397 | ||
2398 | // Reset address and file offset. | |
2399 | void | |
2400 | do_reset_address_and_file_offset(); | |
2401 | ||
2402 | // Output offset. | |
2403 | bool | |
2404 | do_output_offset(const Relobj* object, unsigned int shndx, | |
2405 | section_offset_type offset, | |
2406 | section_offset_type* poutput) const | |
2407 | { | |
2408 | if ((object == this->relobj()) | |
2409 | && (shndx == this->shndx()) | |
2410 | && (offset >= 0) | |
2411 | && (offset <= | |
2412 | convert_types<section_offset_type, uint32_t>(this->original_size_))) | |
2413 | { | |
2414 | *poutput = offset; | |
2415 | return true; | |
2416 | } | |
2417 | else | |
2418 | return false; | |
2419 | } | |
2420 | ||
2421 | private: | |
2422 | // Copying is not allowed. | |
2423 | AArch64_input_section(const AArch64_input_section&); | |
2424 | AArch64_input_section& operator=(const AArch64_input_section&); | |
2425 | ||
2426 | // The relocation stubs. | |
2427 | The_stub_table* stub_table_; | |
2428 | // Original section contents. We have to make a copy here since the file | |
2429 | // containing the original section may not be locked when we need to access | |
2430 | // the contents. | |
2431 | unsigned char* original_contents_; | |
2432 | // Section size of the original input section. | |
2433 | uint32_t original_size_; | |
2434 | // Address alignment of the original input section. | |
2435 | uint32_t original_addralign_; | |
2436 | }; // End of AArch64_input_section | |
2437 | ||
2438 | ||
2439 | // Finalize data size. | |
2440 | ||
2441 | template<int size, bool big_endian> | |
2442 | void | |
2443 | AArch64_input_section<size, big_endian>::set_final_data_size() | |
2444 | { | |
2445 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); | |
2446 | ||
2447 | if (this->is_stub_table_owner()) | |
2448 | { | |
2449 | this->stub_table_->finalize_data_size(); | |
2450 | off = align_address(off, this->stub_table_->addralign()); | |
2451 | off += this->stub_table_->data_size(); | |
2452 | } | |
2453 | this->set_data_size(off); | |
2454 | } | |
2455 | ||
2456 | ||
2457 | // Reset address and file offset. | |
2458 | ||
2459 | template<int size, bool big_endian> | |
2460 | void | |
2461 | AArch64_input_section<size, big_endian>::do_reset_address_and_file_offset() | |
2462 | { | |
2463 | // Size of the original input section contents. | |
2464 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); | |
2465 | ||
2466 | // If this is a stub table owner, account for the stub table size. | |
2467 | if (this->is_stub_table_owner()) | |
2468 | { | |
2469 | The_stub_table* stub_table = this->stub_table_; | |
2470 | ||
2471 | // Reset the stub table's address and file offset. The | |
2472 | // current data size for child will be updated after that. | |
2473 | stub_table_->reset_address_and_file_offset(); | |
2474 | off = align_address(off, stub_table_->addralign()); | |
2475 | off += stub_table->current_data_size(); | |
2476 | } | |
2477 | ||
2478 | this->set_current_data_size(off); | |
2479 | } | |
2480 | ||
2481 | ||
2482 | // Initialize an Arm_input_section. | |
2483 | ||
2484 | template<int size, bool big_endian> | |
2485 | void | |
2486 | AArch64_input_section<size, big_endian>::init() | |
2487 | { | |
2488 | Relobj* relobj = this->relobj(); | |
2489 | unsigned int shndx = this->shndx(); | |
2490 | ||
2491 | // We have to cache original size, alignment and contents to avoid locking | |
2492 | // the original file. | |
2493 | this->original_addralign_ = | |
2494 | convert_types<uint32_t, uint64_t>(relobj->section_addralign(shndx)); | |
2495 | ||
2496 | // This is not efficient but we expect only a small number of relaxed | |
2497 | // input sections for stubs. | |
2498 | section_size_type section_size; | |
2499 | const unsigned char* section_contents = | |
2500 | relobj->section_contents(shndx, §ion_size, false); | |
2501 | this->original_size_ = | |
2502 | convert_types<uint32_t, uint64_t>(relobj->section_size(shndx)); | |
2503 | ||
2504 | gold_assert(this->original_contents_ == NULL); | |
2505 | this->original_contents_ = new unsigned char[section_size]; | |
2506 | memcpy(this->original_contents_, section_contents, section_size); | |
2507 | ||
2508 | // We want to make this look like the original input section after | |
2509 | // output sections are finalized. | |
2510 | Output_section* os = relobj->output_section(shndx); | |
2511 | off_t offset = relobj->output_section_offset(shndx); | |
2512 | gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx)); | |
2513 | this->set_address(os->address() + offset); | |
2514 | this->set_file_offset(os->offset() + offset); | |
2515 | this->set_current_data_size(this->original_size_); | |
2516 | this->finalize_data_size(); | |
2517 | } | |
2518 | ||
2519 | ||
2520 | // Write data to output file. | |
2521 | ||
2522 | template<int size, bool big_endian> | |
2523 | void | |
2524 | AArch64_input_section<size, big_endian>::do_write(Output_file* of) | |
2525 | { | |
2526 | // We have to write out the original section content. | |
2527 | gold_assert(this->original_contents_ != NULL); | |
2528 | of->write(this->offset(), this->original_contents_, | |
2529 | this->original_size_); | |
2530 | ||
2531 | // If this owns a stub table and it is not empty, write it. | |
2532 | if (this->is_stub_table_owner() && !this->stub_table_->empty()) | |
2533 | this->stub_table_->write(of); | |
2534 | } | |
2535 | ||
2536 | ||
2537 | // Arm output section class. This is defined mainly to add a number of stub | |
2538 | // generation methods. | |
2539 | ||
2540 | template<int size, bool big_endian> | |
2541 | class AArch64_output_section : public Output_section | |
2542 | { | |
2543 | public: | |
2544 | typedef Target_aarch64<size, big_endian> The_target_aarch64; | |
2545 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; | |
2546 | typedef Stub_table<size, big_endian> The_stub_table; | |
2547 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; | |
2548 | ||
2549 | public: | |
2550 | AArch64_output_section(const char* name, elfcpp::Elf_Word type, | |
2551 | elfcpp::Elf_Xword flags) | |
2552 | : Output_section(name, type, flags) | |
2553 | { } | |
2554 | ||
2555 | ~AArch64_output_section() {} | |
2556 | ||
2557 | // Group input sections for stub generation. | |
2558 | void | |
2559 | group_sections(section_size_type, bool, Target_aarch64<size, big_endian>*, | |
2560 | const Task*); | |
2561 | ||
2562 | private: | |
2563 | typedef Output_section::Input_section Input_section; | |
2564 | typedef Output_section::Input_section_list Input_section_list; | |
2565 | ||
2566 | // Create a stub group. | |
2567 | void | |
2568 | create_stub_group(Input_section_list::const_iterator, | |
2569 | Input_section_list::const_iterator, | |
2570 | Input_section_list::const_iterator, | |
2571 | The_target_aarch64*, | |
2572 | std::vector<Output_relaxed_input_section*>&, | |
2573 | const Task*); | |
2574 | }; // End of AArch64_output_section | |
2575 | ||
2576 | ||
2577 | // Create a stub group for input sections from FIRST to LAST. OWNER points to | |
2578 | // the input section that will be the owner of the stub table. | |
2579 | ||
2580 | template<int size, bool big_endian> void | |
2581 | AArch64_output_section<size, big_endian>::create_stub_group( | |
2582 | Input_section_list::const_iterator first, | |
2583 | Input_section_list::const_iterator last, | |
2584 | Input_section_list::const_iterator owner, | |
2585 | The_target_aarch64* target, | |
2586 | std::vector<Output_relaxed_input_section*>& new_relaxed_sections, | |
2587 | const Task* task) | |
2588 | { | |
2589 | // Currently we convert ordinary input sections into relaxed sections only | |
2590 | // at this point. | |
2591 | The_aarch64_input_section* input_section; | |
2592 | if (owner->is_relaxed_input_section()) | |
2593 | gold_unreachable(); | |
2594 | else | |
2595 | { | |
2596 | gold_assert(owner->is_input_section()); | |
2597 | // Create a new relaxed input section. We need to lock the original | |
2598 | // file. | |
2599 | Task_lock_obj<Object> tl(task, owner->relobj()); | |
2600 | input_section = | |
2601 | target->new_aarch64_input_section(owner->relobj(), owner->shndx()); | |
2602 | new_relaxed_sections.push_back(input_section); | |
2603 | } | |
2604 | ||
2605 | // Create a stub table. | |
2606 | The_stub_table* stub_table = | |
2607 | target->new_stub_table(input_section); | |
2608 | ||
2609 | input_section->set_stub_table(stub_table); | |
2610 | ||
2611 | Input_section_list::const_iterator p = first; | |
2612 | // Look for input sections or relaxed input sections in [first ... last]. | |
2613 | do | |
2614 | { | |
2615 | if (p->is_input_section() || p->is_relaxed_input_section()) | |
2616 | { | |
2617 | // The stub table information for input sections live | |
2618 | // in their objects. | |
2619 | The_aarch64_relobj* aarch64_relobj = | |
2620 | static_cast<The_aarch64_relobj*>(p->relobj()); | |
2621 | aarch64_relobj->set_stub_table(p->shndx(), stub_table); | |
2622 | } | |
2623 | } | |
2624 | while (p++ != last); | |
2625 | } | |
2626 | ||
2627 | ||
2628 | // Group input sections for stub generation. GROUP_SIZE is roughly the limit of | |
2629 | // stub groups. We grow a stub group by adding input section until the size is | |
2630 | // just below GROUP_SIZE. The last input section will be converted into a stub | |
2631 | // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond | |
2632 | // after the stub table, effectively doubling the group size. | |
2633 | // | |
2634 | // This is similar to the group_sections() function in elf32-arm.c but is | |
2635 | // implemented differently. | |
2636 | ||
2637 | template<int size, bool big_endian> | |
2638 | void AArch64_output_section<size, big_endian>::group_sections( | |
2639 | section_size_type group_size, | |
2640 | bool stubs_always_after_branch, | |
2641 | Target_aarch64<size, big_endian>* target, | |
2642 | const Task* task) | |
2643 | { | |
2644 | typedef enum | |
2645 | { | |
2646 | NO_GROUP, | |
2647 | FINDING_STUB_SECTION, | |
2648 | HAS_STUB_SECTION | |
2649 | } State; | |
2650 | ||
2651 | std::vector<Output_relaxed_input_section*> new_relaxed_sections; | |
2652 | ||
2653 | State state = NO_GROUP; | |
2654 | section_size_type off = 0; | |
2655 | section_size_type group_begin_offset = 0; | |
2656 | section_size_type group_end_offset = 0; | |
2657 | section_size_type stub_table_end_offset = 0; | |
2658 | Input_section_list::const_iterator group_begin = | |
2659 | this->input_sections().end(); | |
2660 | Input_section_list::const_iterator stub_table = | |
2661 | this->input_sections().end(); | |
2662 | Input_section_list::const_iterator group_end = this->input_sections().end(); | |
2663 | for (Input_section_list::const_iterator p = this->input_sections().begin(); | |
2664 | p != this->input_sections().end(); | |
2665 | ++p) | |
2666 | { | |
2667 | section_size_type section_begin_offset = | |
2668 | align_address(off, p->addralign()); | |
2669 | section_size_type section_end_offset = | |
2670 | section_begin_offset + p->data_size(); | |
2671 | ||
2672 | // Check to see if we should group the previously seen sections. | |
2673 | switch (state) | |
2674 | { | |
2675 | case NO_GROUP: | |
2676 | break; | |
2677 | ||
2678 | case FINDING_STUB_SECTION: | |
2679 | // Adding this section makes the group larger than GROUP_SIZE. | |
2680 | if (section_end_offset - group_begin_offset >= group_size) | |
2681 | { | |
2682 | if (stubs_always_after_branch) | |
2683 | { | |
2684 | gold_assert(group_end != this->input_sections().end()); | |
2685 | this->create_stub_group(group_begin, group_end, group_end, | |
2686 | target, new_relaxed_sections, | |
2687 | task); | |
2688 | state = NO_GROUP; | |
2689 | } | |
2690 | else | |
2691 | { | |
2692 | // Input sections up to stub_group_size bytes after the stub | |
2693 | // table can be handled by it too. | |
2694 | state = HAS_STUB_SECTION; | |
2695 | stub_table = group_end; | |
2696 | stub_table_end_offset = group_end_offset; | |
2697 | } | |
2698 | } | |
2699 | break; | |
2700 | ||
2701 | case HAS_STUB_SECTION: | |
2702 | // Adding this section makes the post stub-section group larger | |
2703 | // than GROUP_SIZE. | |
2704 | gold_unreachable(); | |
2705 | // NOT SUPPORTED YET. For completeness only. | |
2706 | if (section_end_offset - stub_table_end_offset >= group_size) | |
2707 | { | |
2708 | gold_assert(group_end != this->input_sections().end()); | |
2709 | this->create_stub_group(group_begin, group_end, stub_table, | |
2710 | target, new_relaxed_sections, task); | |
2711 | state = NO_GROUP; | |
2712 | } | |
2713 | break; | |
2714 | ||
2715 | default: | |
2716 | gold_unreachable(); | |
2717 | } | |
2718 | ||
2719 | // If we see an input section and currently there is no group, start | |
2720 | // a new one. Skip any empty sections. We look at the data size | |
2721 | // instead of calling p->relobj()->section_size() to avoid locking. | |
2722 | if ((p->is_input_section() || p->is_relaxed_input_section()) | |
2723 | && (p->data_size() != 0)) | |
2724 | { | |
2725 | if (state == NO_GROUP) | |
2726 | { | |
2727 | state = FINDING_STUB_SECTION; | |
2728 | group_begin = p; | |
2729 | group_begin_offset = section_begin_offset; | |
2730 | } | |
2731 | ||
2732 | // Keep track of the last input section seen. | |
2733 | group_end = p; | |
2734 | group_end_offset = section_end_offset; | |
2735 | } | |
2736 | ||
2737 | off = section_end_offset; | |
2738 | } | |
2739 | ||
2740 | // Create a stub group for any ungrouped sections. | |
2741 | if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION) | |
2742 | { | |
2743 | gold_assert(group_end != this->input_sections().end()); | |
2744 | this->create_stub_group(group_begin, group_end, | |
2745 | (state == FINDING_STUB_SECTION | |
2746 | ? group_end | |
2747 | : stub_table), | |
2748 | target, new_relaxed_sections, task); | |
2749 | } | |
8e33481e | 2750 | |
83a01957 HS |
2751 | if (!new_relaxed_sections.empty()) |
2752 | this->convert_input_sections_to_relaxed_sections(new_relaxed_sections); | |
2753 | ||
2754 | // Update the section offsets | |
2755 | for (size_t i = 0; i < new_relaxed_sections.size(); ++i) | |
2756 | { | |
2757 | The_aarch64_relobj* relobj = static_cast<The_aarch64_relobj*>( | |
2758 | new_relaxed_sections[i]->relobj()); | |
2759 | unsigned int shndx = new_relaxed_sections[i]->shndx(); | |
2760 | // Tell AArch64_relobj that this input section is converted. | |
2761 | relobj->convert_input_section_to_relaxed_section(shndx); | |
2762 | } | |
2763 | } // End of AArch64_output_section::group_sections | |
3a531937 | 2764 | |
053a4d68 | 2765 | |
9363c7c3 JY |
2766 | AArch64_reloc_property_table* aarch64_reloc_property_table = NULL; |
2767 | ||
3a531937 | 2768 | |
053a4d68 JY |
2769 | // The aarch64 target class. |
2770 | // See the ABI at | |
2771 | // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf | |
2772 | template<int size, bool big_endian> | |
2773 | class Target_aarch64 : public Sized_target<size, big_endian> | |
2774 | { | |
2775 | public: | |
83a01957 | 2776 | typedef Target_aarch64<size, big_endian> This; |
053a4d68 JY |
2777 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
2778 | Reloc_section; | |
83a01957 | 2779 | typedef Relocate_info<size, big_endian> The_relocate_info; |
053a4d68 | 2780 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
83a01957 HS |
2781 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
2782 | typedef Reloc_stub<size, big_endian> The_reloc_stub; | |
a48d0c12 | 2783 | typedef Erratum_stub<size, big_endian> The_erratum_stub; |
83a01957 HS |
2784 | typedef typename Reloc_stub<size, big_endian>::Key The_reloc_stub_key; |
2785 | typedef Stub_table<size, big_endian> The_stub_table; | |
2786 | typedef std::vector<The_stub_table*> Stub_table_list; | |
2787 | typedef typename Stub_table_list::iterator Stub_table_iterator; | |
2788 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; | |
2789 | typedef AArch64_output_section<size, big_endian> The_aarch64_output_section; | |
2790 | typedef Unordered_map<Section_id, | |
2791 | AArch64_input_section<size, big_endian>*, | |
2792 | Section_id_hash> AArch64_input_section_map; | |
5019d64a | 2793 | typedef AArch64_insn_utilities<big_endian> Insn_utilities; |
8e33481e | 2794 | const static int TCB_SIZE = size / 8 * 2; |
053a4d68 JY |
2795 | |
2796 | Target_aarch64(const Target::Target_info* info = &aarch64_info) | |
2797 | : Sized_target<size, big_endian>(info), | |
3a531937 JY |
2798 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
2799 | got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), | |
2800 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_AARCH64_COPY), | |
83a01957 HS |
2801 | got_mod_index_offset_(-1U), |
2802 | tlsdesc_reloc_info_(), tls_base_symbol_defined_(false), | |
0bf32ea9 | 2803 | stub_tables_(), stub_group_size_(0), aarch64_input_section_map_() |
053a4d68 JY |
2804 | { } |
2805 | ||
2806 | // Scan the relocations to determine unreferenced sections for | |
2807 | // garbage collection. | |
2808 | void | |
2809 | gc_process_relocs(Symbol_table* symtab, | |
2810 | Layout* layout, | |
2811 | Sized_relobj_file<size, big_endian>* object, | |
2812 | unsigned int data_shndx, | |
2813 | unsigned int sh_type, | |
2814 | const unsigned char* prelocs, | |
2815 | size_t reloc_count, | |
2816 | Output_section* output_section, | |
2817 | bool needs_special_offset_handling, | |
2818 | size_t local_symbol_count, | |
2819 | const unsigned char* plocal_symbols); | |
2820 | ||
2821 | // Scan the relocations to look for symbol adjustments. | |
2822 | void | |
2823 | scan_relocs(Symbol_table* symtab, | |
2824 | Layout* layout, | |
2825 | Sized_relobj_file<size, big_endian>* object, | |
2826 | unsigned int data_shndx, | |
2827 | unsigned int sh_type, | |
2828 | const unsigned char* prelocs, | |
2829 | size_t reloc_count, | |
2830 | Output_section* output_section, | |
2831 | bool needs_special_offset_handling, | |
2832 | size_t local_symbol_count, | |
2833 | const unsigned char* plocal_symbols); | |
2834 | ||
2835 | // Finalize the sections. | |
2836 | void | |
2837 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); | |
2838 | ||
3a531937 JY |
2839 | // Return the value to use for a dynamic which requires special |
2840 | // treatment. | |
2841 | uint64_t | |
2842 | do_dynsym_value(const Symbol*) const; | |
2843 | ||
053a4d68 JY |
2844 | // Relocate a section. |
2845 | void | |
2846 | relocate_section(const Relocate_info<size, big_endian>*, | |
2847 | unsigned int sh_type, | |
2848 | const unsigned char* prelocs, | |
2849 | size_t reloc_count, | |
2850 | Output_section* output_section, | |
2851 | bool needs_special_offset_handling, | |
2852 | unsigned char* view, | |
2853 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
2854 | section_size_type view_size, | |
2855 | const Reloc_symbol_changes*); | |
2856 | ||
2857 | // Scan the relocs during a relocatable link. | |
2858 | void | |
2859 | scan_relocatable_relocs(Symbol_table* symtab, | |
2860 | Layout* layout, | |
2861 | Sized_relobj_file<size, big_endian>* object, | |
2862 | unsigned int data_shndx, | |
2863 | unsigned int sh_type, | |
2864 | const unsigned char* prelocs, | |
2865 | size_t reloc_count, | |
2866 | Output_section* output_section, | |
2867 | bool needs_special_offset_handling, | |
2868 | size_t local_symbol_count, | |
2869 | const unsigned char* plocal_symbols, | |
2870 | Relocatable_relocs*); | |
2871 | ||
2872 | // Relocate a section during a relocatable link. | |
2873 | void | |
2874 | relocate_relocs( | |
2875 | const Relocate_info<size, big_endian>*, | |
2876 | unsigned int sh_type, | |
2877 | const unsigned char* prelocs, | |
2878 | size_t reloc_count, | |
2879 | Output_section* output_section, | |
2880 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, | |
053a4d68 JY |
2881 | unsigned char* view, |
2882 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
2883 | section_size_type view_size, | |
2884 | unsigned char* reloc_view, | |
2885 | section_size_type reloc_view_size); | |
2886 | ||
3a531937 JY |
2887 | // Return the symbol index to use for a target specific relocation. |
2888 | // The only target specific relocation is R_AARCH64_TLSDESC for a | |
2889 | // local symbol, which is an absolute reloc. | |
2890 | unsigned int | |
2891 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
2892 | { | |
2893 | gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC); | |
2894 | return 0; | |
2895 | } | |
2896 | ||
2897 | // Return the addend to use for a target specific relocation. | |
7fa5525f RÁE |
2898 | uint64_t |
2899 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
3a531937 | 2900 | |
9363c7c3 JY |
2901 | // Return the PLT section. |
2902 | uint64_t | |
2903 | do_plt_address_for_global(const Symbol* gsym) const | |
2904 | { return this->plt_section()->address_for_global(gsym); } | |
2905 | ||
2906 | uint64_t | |
2907 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
2908 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
2909 | ||
9726c3c1 HS |
2910 | // This function should be defined in targets that can use relocation |
2911 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
2912 | // and global_reloc_may_be_function_pointer) | |
2913 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
2914 | // fold those functions whose pointer is defintely not taken. | |
2915 | bool | |
2916 | do_can_check_for_function_pointers() const | |
2917 | { return true; } | |
2918 | ||
053a4d68 JY |
2919 | // Return the number of entries in the PLT. |
2920 | unsigned int | |
2921 | plt_entry_count() const; | |
2922 | ||
2923 | //Return the offset of the first non-reserved PLT entry. | |
2924 | unsigned int | |
2925 | first_plt_entry_offset() const; | |
2926 | ||
2927 | // Return the size of each PLT entry. | |
2928 | unsigned int | |
2929 | plt_entry_size() const; | |
2930 | ||
83a01957 HS |
2931 | // Create a stub table. |
2932 | The_stub_table* | |
2933 | new_stub_table(The_aarch64_input_section*); | |
2934 | ||
2935 | // Create an aarch64 input section. | |
2936 | The_aarch64_input_section* | |
2937 | new_aarch64_input_section(Relobj*, unsigned int); | |
2938 | ||
2939 | // Find an aarch64 input section instance for a given OBJ and SHNDX. | |
2940 | The_aarch64_input_section* | |
2941 | find_aarch64_input_section(Relobj*, unsigned int) const; | |
2942 | ||
2943 | // Return the thread control block size. | |
8e33481e HS |
2944 | unsigned int |
2945 | tcb_size() const { return This::TCB_SIZE; } | |
2946 | ||
83a01957 HS |
2947 | // Scan a section for stub generation. |
2948 | void | |
2949 | scan_section_for_stubs(const Relocate_info<size, big_endian>*, unsigned int, | |
2950 | const unsigned char*, size_t, Output_section*, | |
2951 | bool, const unsigned char*, | |
2952 | Address, | |
2953 | section_size_type); | |
2954 | ||
2955 | // Scan a relocation section for stub. | |
2956 | template<int sh_type> | |
2957 | void | |
2958 | scan_reloc_section_for_stubs( | |
2959 | const The_relocate_info* relinfo, | |
2960 | const unsigned char* prelocs, | |
2961 | size_t reloc_count, | |
2962 | Output_section* output_section, | |
2963 | bool needs_special_offset_handling, | |
2964 | const unsigned char* view, | |
2965 | Address view_address, | |
2966 | section_size_type); | |
2967 | ||
2968 | // Relocate a single stub. | |
2969 | void | |
2970 | relocate_stub(The_reloc_stub*, const Relocate_info<size, big_endian>*, | |
2971 | Output_section*, unsigned char*, Address, | |
2972 | section_size_type); | |
2973 | ||
2974 | // Get the default AArch64 target. | |
2975 | static This* | |
2976 | current_target() | |
2977 | { | |
2978 | gold_assert(parameters->target().machine_code() == elfcpp::EM_AARCH64 | |
2979 | && parameters->target().get_size() == size | |
2980 | && parameters->target().is_big_endian() == big_endian); | |
2981 | return static_cast<This*>(parameters->sized_target<size, big_endian>()); | |
2982 | } | |
2983 | ||
5019d64a | 2984 | |
2f0c79aa | 2985 | // Scan erratum 843419 for a part of a section. |
5019d64a HS |
2986 | void |
2987 | scan_erratum_843419_span( | |
2988 | AArch64_relobj<size, big_endian>*, | |
2f0c79aa HS |
2989 | unsigned int, |
2990 | const section_size_type, | |
2991 | const section_size_type, | |
2992 | unsigned char*, | |
2993 | Address); | |
2994 | ||
2995 | // Scan erratum 835769 for a part of a section. | |
2996 | void | |
2997 | scan_erratum_835769_span( | |
2998 | AArch64_relobj<size, big_endian>*, | |
2999 | unsigned int, | |
5019d64a HS |
3000 | const section_size_type, |
3001 | const section_size_type, | |
3002 | unsigned char*, | |
3003 | Address); | |
3004 | ||
9363c7c3 JY |
3005 | protected: |
3006 | void | |
3007 | do_select_as_default_target() | |
3008 | { | |
3009 | gold_assert(aarch64_reloc_property_table == NULL); | |
3010 | aarch64_reloc_property_table = new AArch64_reloc_property_table(); | |
3011 | } | |
3012 | ||
3a531937 JY |
3013 | // Add a new reloc argument, returning the index in the vector. |
3014 | size_t | |
3015 | add_tlsdesc_info(Sized_relobj_file<size, big_endian>* object, | |
3016 | unsigned int r_sym) | |
3017 | { | |
3018 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
3019 | return this->tlsdesc_reloc_info_.size() - 1; | |
3020 | } | |
3021 | ||
9363c7c3 | 3022 | virtual Output_data_plt_aarch64<size, big_endian>* |
3a531937 JY |
3023 | do_make_data_plt(Layout* layout, |
3024 | Output_data_got_aarch64<size, big_endian>* got, | |
3025 | Output_data_space* got_plt, | |
3026 | Output_data_space* got_irelative) | |
9363c7c3 | 3027 | { |
3a531937 JY |
3028 | return new Output_data_plt_aarch64_standard<size, big_endian>( |
3029 | layout, got, got_plt, got_irelative); | |
9363c7c3 JY |
3030 | } |
3031 | ||
83a01957 HS |
3032 | |
3033 | // do_make_elf_object to override the same function in the base class. | |
3034 | Object* | |
3035 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
3036 | const elfcpp::Ehdr<size, big_endian>&); | |
3037 | ||
9363c7c3 | 3038 | Output_data_plt_aarch64<size, big_endian>* |
3a531937 JY |
3039 | make_data_plt(Layout* layout, |
3040 | Output_data_got_aarch64<size, big_endian>* got, | |
3041 | Output_data_space* got_plt, | |
3042 | Output_data_space* got_irelative) | |
9363c7c3 | 3043 | { |
3a531937 | 3044 | return this->do_make_data_plt(layout, got, got_plt, got_irelative); |
9363c7c3 JY |
3045 | } |
3046 | ||
83a01957 HS |
3047 | // We only need to generate stubs, and hence perform relaxation if we are |
3048 | // not doing relocatable linking. | |
3049 | virtual bool | |
3050 | do_may_relax() const | |
3051 | { return !parameters->options().relocatable(); } | |
3052 | ||
3053 | // Relaxation hook. This is where we do stub generation. | |
3054 | virtual bool | |
3055 | do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*); | |
3056 | ||
3057 | void | |
3058 | group_sections(Layout* layout, | |
3059 | section_size_type group_size, | |
3060 | bool stubs_always_after_branch, | |
3061 | const Task* task); | |
3062 | ||
3063 | void | |
3064 | scan_reloc_for_stub(const The_relocate_info*, unsigned int, | |
3065 | const Sized_symbol<size>*, unsigned int, | |
3066 | const Symbol_value<size>*, | |
3067 | typename elfcpp::Elf_types<size>::Elf_Swxword, | |
3068 | Address Elf_Addr); | |
3069 | ||
3070 | // Make an output section. | |
3071 | Output_section* | |
3072 | do_make_output_section(const char* name, elfcpp::Elf_Word type, | |
3073 | elfcpp::Elf_Xword flags) | |
3074 | { return new The_aarch64_output_section(name, type, flags); } | |
3075 | ||
053a4d68 JY |
3076 | private: |
3077 | // The class which scans relocations. | |
3078 | class Scan | |
3079 | { | |
3080 | public: | |
3081 | Scan() | |
3082 | : issued_non_pic_error_(false) | |
3083 | { } | |
3084 | ||
053a4d68 JY |
3085 | inline void |
3086 | local(Symbol_table* symtab, Layout* layout, Target_aarch64* target, | |
3087 | Sized_relobj_file<size, big_endian>* object, | |
3088 | unsigned int data_shndx, | |
3089 | Output_section* output_section, | |
3090 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, | |
3091 | const elfcpp::Sym<size, big_endian>& lsym, | |
3092 | bool is_discarded); | |
3093 | ||
3094 | inline void | |
3095 | global(Symbol_table* symtab, Layout* layout, Target_aarch64* target, | |
3096 | Sized_relobj_file<size, big_endian>* object, | |
3097 | unsigned int data_shndx, | |
3098 | Output_section* output_section, | |
3099 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, | |
3100 | Symbol* gsym); | |
3101 | ||
3102 | inline bool | |
3103 | local_reloc_may_be_function_pointer(Symbol_table* , Layout* , | |
9363c7c3 JY |
3104 | Target_aarch64<size, big_endian>* , |
3105 | Sized_relobj_file<size, big_endian>* , | |
3106 | unsigned int , | |
3107 | Output_section* , | |
3108 | const elfcpp::Rela<size, big_endian>& , | |
3109 | unsigned int r_type, | |
3110 | const elfcpp::Sym<size, big_endian>&); | |
053a4d68 JY |
3111 | |
3112 | inline bool | |
3113 | global_reloc_may_be_function_pointer(Symbol_table* , Layout* , | |
9363c7c3 JY |
3114 | Target_aarch64<size, big_endian>* , |
3115 | Sized_relobj_file<size, big_endian>* , | |
3116 | unsigned int , | |
3117 | Output_section* , | |
3118 | const elfcpp::Rela<size, big_endian>& , | |
3119 | unsigned int r_type, | |
3120 | Symbol* gsym); | |
053a4d68 JY |
3121 | |
3122 | private: | |
3123 | static void | |
3124 | unsupported_reloc_local(Sized_relobj_file<size, big_endian>*, | |
3125 | unsigned int r_type); | |
3126 | ||
3127 | static void | |
3128 | unsupported_reloc_global(Sized_relobj_file<size, big_endian>*, | |
3129 | unsigned int r_type, Symbol*); | |
3130 | ||
3131 | inline bool | |
3132 | possible_function_pointer_reloc(unsigned int r_type); | |
3133 | ||
3134 | void | |
3135 | check_non_pic(Relobj*, unsigned int r_type); | |
3136 | ||
9726c3c1 HS |
3137 | bool |
3138 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, big_endian>*, | |
3139 | unsigned int r_type); | |
3140 | ||
053a4d68 JY |
3141 | // Whether we have issued an error about a non-PIC compilation. |
3142 | bool issued_non_pic_error_; | |
3143 | }; | |
3144 | ||
3145 | // The class which implements relocation. | |
3146 | class Relocate | |
3147 | { | |
3148 | public: | |
3149 | Relocate() | |
3a531937 | 3150 | : skip_call_tls_get_addr_(false) |
053a4d68 JY |
3151 | { } |
3152 | ||
3153 | ~Relocate() | |
3154 | { } | |
3155 | ||
3156 | // Do a relocation. Return false if the caller should not issue | |
3157 | // any warnings about this relocation. | |
3158 | inline bool | |
91a65d2f AM |
3159 | relocate(const Relocate_info<size, big_endian>*, unsigned int, |
3160 | Target_aarch64*, Output_section*, size_t, const unsigned char*, | |
3161 | const Sized_symbol<size>*, const Symbol_value<size>*, | |
053a4d68 JY |
3162 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, |
3163 | section_size_type); | |
3164 | ||
8e33481e | 3165 | private: |
83a01957 HS |
3166 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
3167 | relocate_tls(const Relocate_info<size, big_endian>*, | |
8e33481e HS |
3168 | Target_aarch64<size, big_endian>*, |
3169 | size_t, | |
3170 | const elfcpp::Rela<size, big_endian>&, | |
3171 | unsigned int r_type, const Sized_symbol<size>*, | |
3172 | const Symbol_value<size>*, | |
3173 | unsigned char*, | |
3174 | typename elfcpp::Elf_types<size>::Elf_Addr); | |
3175 | ||
83a01957 | 3176 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 3177 | tls_gd_to_le( |
83a01957 | 3178 | const Relocate_info<size, big_endian>*, |
3a531937 JY |
3179 | Target_aarch64<size, big_endian>*, |
3180 | const elfcpp::Rela<size, big_endian>&, | |
3181 | unsigned int, | |
3182 | unsigned char*, | |
3183 | const Symbol_value<size>*); | |
3184 | ||
9726c3c1 HS |
3185 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
3186 | tls_ld_to_le( | |
3187 | const Relocate_info<size, big_endian>*, | |
3188 | Target_aarch64<size, big_endian>*, | |
3189 | const elfcpp::Rela<size, big_endian>&, | |
3190 | unsigned int, | |
3191 | unsigned char*, | |
3192 | const Symbol_value<size>*); | |
3193 | ||
83a01957 | 3194 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 3195 | tls_ie_to_le( |
83a01957 | 3196 | const Relocate_info<size, big_endian>*, |
3a531937 JY |
3197 | Target_aarch64<size, big_endian>*, |
3198 | const elfcpp::Rela<size, big_endian>&, | |
3199 | unsigned int, | |
3200 | unsigned char*, | |
3201 | const Symbol_value<size>*); | |
3202 | ||
83a01957 | 3203 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 3204 | tls_desc_gd_to_le( |
83a01957 | 3205 | const Relocate_info<size, big_endian>*, |
3a531937 JY |
3206 | Target_aarch64<size, big_endian>*, |
3207 | const elfcpp::Rela<size, big_endian>&, | |
3208 | unsigned int, | |
3209 | unsigned char*, | |
3210 | const Symbol_value<size>*); | |
3211 | ||
83a01957 | 3212 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 3213 | tls_desc_gd_to_ie( |
83a01957 | 3214 | const Relocate_info<size, big_endian>*, |
3a531937 JY |
3215 | Target_aarch64<size, big_endian>*, |
3216 | const elfcpp::Rela<size, big_endian>&, | |
3217 | unsigned int, | |
3218 | unsigned char*, | |
3219 | const Symbol_value<size>*, | |
3220 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
3221 | typename elfcpp::Elf_types<size>::Elf_Addr); | |
3222 | ||
3223 | bool skip_call_tls_get_addr_; | |
3224 | ||
8e33481e | 3225 | }; // End of class Relocate |
053a4d68 JY |
3226 | |
3227 | // A class which returns the size required for a relocation type, | |
3228 | // used while scanning relocs during a relocatable link. | |
3229 | class Relocatable_size_for_reloc | |
3230 | { | |
3231 | public: | |
3232 | unsigned int | |
3233 | get_size_for_reloc(unsigned int, Relobj*); | |
3234 | }; | |
3235 | ||
3236 | // Adjust TLS relocation type based on the options and whether this | |
3237 | // is a local symbol. | |
3238 | static tls::Tls_optimization | |
3239 | optimize_tls_reloc(bool is_final, int r_type); | |
3240 | ||
3241 | // Get the GOT section, creating it if necessary. | |
3242 | Output_data_got_aarch64<size, big_endian>* | |
3243 | got_section(Symbol_table*, Layout*); | |
3244 | ||
3245 | // Get the GOT PLT section. | |
3246 | Output_data_space* | |
3247 | got_plt_section() const | |
3248 | { | |
3249 | gold_assert(this->got_plt_ != NULL); | |
3250 | return this->got_plt_; | |
3251 | } | |
3252 | ||
3a531937 JY |
3253 | // Get the GOT section for TLSDESC entries. |
3254 | Output_data_got<size, big_endian>* | |
3255 | got_tlsdesc_section() const | |
3256 | { | |
3257 | gold_assert(this->got_tlsdesc_ != NULL); | |
3258 | return this->got_tlsdesc_; | |
3259 | } | |
3260 | ||
053a4d68 JY |
3261 | // Create the PLT section. |
3262 | void | |
3263 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
3264 | ||
3265 | // Create a PLT entry for a global symbol. | |
3266 | void | |
3267 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
3268 | ||
3a531937 JY |
3269 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
3270 | void | |
3271 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
3272 | Sized_relobj_file<size, big_endian>* relobj, | |
3273 | unsigned int local_sym_index); | |
3274 | ||
3275 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. | |
3276 | void | |
3277 | define_tls_base_symbol(Symbol_table*, Layout*); | |
3278 | ||
3279 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. | |
3280 | void | |
3281 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
3282 | ||
3283 | // Create a GOT entry for the TLS module index. | |
3284 | unsigned int | |
3285 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
3286 | Sized_relobj_file<size, big_endian>* object); | |
3287 | ||
053a4d68 JY |
3288 | // Get the PLT section. |
3289 | Output_data_plt_aarch64<size, big_endian>* | |
3290 | plt_section() const | |
3291 | { | |
3292 | gold_assert(this->plt_ != NULL); | |
3293 | return this->plt_; | |
3294 | } | |
3295 | ||
0ef3814f HS |
3296 | // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For |
3297 | // ST_E_843419, we need an additional field for adrp offset. | |
2f0c79aa HS |
3298 | void create_erratum_stub( |
3299 | AArch64_relobj<size, big_endian>* relobj, | |
3300 | unsigned int shndx, | |
3301 | section_size_type erratum_insn_offset, | |
3302 | Address erratum_address, | |
3303 | typename Insn_utilities::Insntype erratum_insn, | |
0ef3814f HS |
3304 | int erratum_type, |
3305 | unsigned int e843419_adrp_offset=0); | |
2f0c79aa | 3306 | |
5019d64a HS |
3307 | // Return whether this is a 3-insn erratum sequence. |
3308 | bool is_erratum_843419_sequence( | |
3309 | typename elfcpp::Swap<32,big_endian>::Valtype insn1, | |
3310 | typename elfcpp::Swap<32,big_endian>::Valtype insn2, | |
3311 | typename elfcpp::Swap<32,big_endian>::Valtype insn3); | |
3312 | ||
2f0c79aa HS |
3313 | // Return whether this is a 835769 sequence. |
3314 | // (Similarly implemented as in elfnn-aarch64.c.) | |
3315 | bool is_erratum_835769_sequence( | |
3316 | typename elfcpp::Swap<32,big_endian>::Valtype, | |
3317 | typename elfcpp::Swap<32,big_endian>::Valtype); | |
3318 | ||
053a4d68 JY |
3319 | // Get the dynamic reloc section, creating it if necessary. |
3320 | Reloc_section* | |
3321 | rela_dyn_section(Layout*); | |
3322 | ||
3a531937 JY |
3323 | // Get the section to use for TLSDESC relocations. |
3324 | Reloc_section* | |
3325 | rela_tlsdesc_section(Layout*) const; | |
3326 | ||
3327 | // Get the section to use for IRELATIVE relocations. | |
3328 | Reloc_section* | |
3329 | rela_irelative_section(Layout*); | |
3330 | ||
053a4d68 JY |
3331 | // Add a potential copy relocation. |
3332 | void | |
3333 | copy_reloc(Symbol_table* symtab, Layout* layout, | |
3334 | Sized_relobj_file<size, big_endian>* object, | |
3335 | unsigned int shndx, Output_section* output_section, | |
3336 | Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) | |
3337 | { | |
859d7987 | 3338 | unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info()); |
053a4d68 JY |
3339 | this->copy_relocs_.copy_reloc(symtab, layout, |
3340 | symtab->get_sized_symbol<size>(sym), | |
3341 | object, shndx, output_section, | |
859d7987 CC |
3342 | r_type, reloc.get_r_offset(), |
3343 | reloc.get_r_addend(), | |
3344 | this->rela_dyn_section(layout)); | |
053a4d68 JY |
3345 | } |
3346 | ||
3347 | // Information about this specific target which we pass to the | |
3348 | // general Target structure. | |
3349 | static const Target::Target_info aarch64_info; | |
3350 | ||
3351 | // The types of GOT entries needed for this platform. | |
3352 | // These values are exposed to the ABI in an incremental link. | |
3353 | // Do not renumber existing values without changing the version | |
3354 | // number of the .gnu_incremental_inputs section. | |
3355 | enum Got_type | |
3356 | { | |
3357 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
3358 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
3359 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
3360 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
3361 | }; | |
3362 | ||
3a531937 JY |
3363 | // This type is used as the argument to the target specific |
3364 | // relocation routines. The only target specific reloc is | |
3365 | // R_AARCh64_TLSDESC against a local symbol. | |
3366 | struct Tlsdesc_info | |
3367 | { | |
3368 | Tlsdesc_info(Sized_relobj_file<size, big_endian>* a_object, | |
3369 | unsigned int a_r_sym) | |
3370 | : object(a_object), r_sym(a_r_sym) | |
3371 | { } | |
3372 | ||
3373 | // The object in which the local symbol is defined. | |
3374 | Sized_relobj_file<size, big_endian>* object; | |
3375 | // The local symbol index in the object. | |
3376 | unsigned int r_sym; | |
3377 | }; | |
3378 | ||
053a4d68 JY |
3379 | // The GOT section. |
3380 | Output_data_got_aarch64<size, big_endian>* got_; | |
3381 | // The PLT section. | |
3382 | Output_data_plt_aarch64<size, big_endian>* plt_; | |
3383 | // The GOT PLT section. | |
3384 | Output_data_space* got_plt_; | |
3a531937 JY |
3385 | // The GOT section for IRELATIVE relocations. |
3386 | Output_data_space* got_irelative_; | |
3387 | // The GOT section for TLSDESC relocations. | |
3388 | Output_data_got<size, big_endian>* got_tlsdesc_; | |
053a4d68 JY |
3389 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
3390 | Symbol* global_offset_table_; | |
3391 | // The dynamic reloc section. | |
3392 | Reloc_section* rela_dyn_; | |
3a531937 JY |
3393 | // The section to use for IRELATIVE relocs. |
3394 | Reloc_section* rela_irelative_; | |
053a4d68 JY |
3395 | // Relocs saved to avoid a COPY reloc. |
3396 | Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; | |
3a531937 JY |
3397 | // Offset of the GOT entry for the TLS module index. |
3398 | unsigned int got_mod_index_offset_; | |
3399 | // We handle R_AARCH64_TLSDESC against a local symbol as a target | |
3400 | // specific relocation. Here we store the object and local symbol | |
3401 | // index for the relocation. | |
3402 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
3403 | // True if the _TLS_MODULE_BASE_ symbol has been defined. | |
3404 | bool tls_base_symbol_defined_; | |
83a01957 HS |
3405 | // List of stub_tables |
3406 | Stub_table_list stub_tables_; | |
0bf32ea9 JY |
3407 | // Actual stub group size |
3408 | section_size_type stub_group_size_; | |
83a01957 | 3409 | AArch64_input_section_map aarch64_input_section_map_; |
8e33481e | 3410 | }; // End of Target_aarch64 |
053a4d68 | 3411 | |
3a531937 | 3412 | |
053a4d68 JY |
3413 | template<> |
3414 | const Target::Target_info Target_aarch64<64, false>::aarch64_info = | |
3415 | { | |
3416 | 64, // size | |
3417 | false, // is_big_endian | |
3418 | elfcpp::EM_AARCH64, // machine_code | |
3419 | false, // has_make_symbol | |
3420 | false, // has_resolve | |
3421 | false, // has_code_fill | |
3422 | true, // is_default_stack_executable | |
9726c3c1 | 3423 | true, // can_icf_inline_merge_sections |
053a4d68 JY |
3424 | '\0', // wrap_char |
3425 | "/lib/ld.so.1", // program interpreter | |
3426 | 0x400000, // default_text_segment_address | |
3b0357da | 3427 | 0x10000, // abi_pagesize (overridable by -z max-page-size) |
053a4d68 JY |
3428 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
3429 | false, // isolate_execinstr | |
3430 | 0, // rosegment_gap | |
3431 | elfcpp::SHN_UNDEF, // small_common_shndx | |
3432 | elfcpp::SHN_UNDEF, // large_common_shndx | |
3433 | 0, // small_common_section_flags | |
3434 | 0, // large_common_section_flags | |
3435 | NULL, // attributes_section | |
3436 | NULL, // attributes_vendor | |
8d9743bd MK |
3437 | "_start", // entry_symbol_name |
3438 | 32, // hash_entry_size | |
053a4d68 JY |
3439 | }; |
3440 | ||
3441 | template<> | |
3442 | const Target::Target_info Target_aarch64<32, false>::aarch64_info = | |
3443 | { | |
3444 | 32, // size | |
3445 | false, // is_big_endian | |
3446 | elfcpp::EM_AARCH64, // machine_code | |
3447 | false, // has_make_symbol | |
3448 | false, // has_resolve | |
3449 | false, // has_code_fill | |
3450 | true, // is_default_stack_executable | |
3451 | false, // can_icf_inline_merge_sections | |
3452 | '\0', // wrap_char | |
3453 | "/lib/ld.so.1", // program interpreter | |
3454 | 0x400000, // default_text_segment_address | |
3b0357da | 3455 | 0x10000, // abi_pagesize (overridable by -z max-page-size) |
053a4d68 JY |
3456 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
3457 | false, // isolate_execinstr | |
3458 | 0, // rosegment_gap | |
3459 | elfcpp::SHN_UNDEF, // small_common_shndx | |
3460 | elfcpp::SHN_UNDEF, // large_common_shndx | |
3461 | 0, // small_common_section_flags | |
3462 | 0, // large_common_section_flags | |
3463 | NULL, // attributes_section | |
3464 | NULL, // attributes_vendor | |
8d9743bd MK |
3465 | "_start", // entry_symbol_name |
3466 | 32, // hash_entry_size | |
053a4d68 JY |
3467 | }; |
3468 | ||
3469 | template<> | |
3470 | const Target::Target_info Target_aarch64<64, true>::aarch64_info = | |
3471 | { | |
3472 | 64, // size | |
3473 | true, // is_big_endian | |
3474 | elfcpp::EM_AARCH64, // machine_code | |
3475 | false, // has_make_symbol | |
3476 | false, // has_resolve | |
3477 | false, // has_code_fill | |
3478 | true, // is_default_stack_executable | |
9726c3c1 | 3479 | true, // can_icf_inline_merge_sections |
053a4d68 JY |
3480 | '\0', // wrap_char |
3481 | "/lib/ld.so.1", // program interpreter | |
3482 | 0x400000, // default_text_segment_address | |
3b0357da | 3483 | 0x10000, // abi_pagesize (overridable by -z max-page-size) |
053a4d68 JY |
3484 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
3485 | false, // isolate_execinstr | |
3486 | 0, // rosegment_gap | |
3487 | elfcpp::SHN_UNDEF, // small_common_shndx | |
3488 | elfcpp::SHN_UNDEF, // large_common_shndx | |
3489 | 0, // small_common_section_flags | |
3490 | 0, // large_common_section_flags | |
3491 | NULL, // attributes_section | |
3492 | NULL, // attributes_vendor | |
8d9743bd MK |
3493 | "_start", // entry_symbol_name |
3494 | 32, // hash_entry_size | |
053a4d68 JY |
3495 | }; |
3496 | ||
3497 | template<> | |
3498 | const Target::Target_info Target_aarch64<32, true>::aarch64_info = | |
3499 | { | |
3500 | 32, // size | |
3501 | true, // is_big_endian | |
3502 | elfcpp::EM_AARCH64, // machine_code | |
3503 | false, // has_make_symbol | |
3504 | false, // has_resolve | |
3505 | false, // has_code_fill | |
3506 | true, // is_default_stack_executable | |
3507 | false, // can_icf_inline_merge_sections | |
3508 | '\0', // wrap_char | |
3509 | "/lib/ld.so.1", // program interpreter | |
3510 | 0x400000, // default_text_segment_address | |
3b0357da | 3511 | 0x10000, // abi_pagesize (overridable by -z max-page-size) |
053a4d68 JY |
3512 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
3513 | false, // isolate_execinstr | |
3514 | 0, // rosegment_gap | |
3515 | elfcpp::SHN_UNDEF, // small_common_shndx | |
3516 | elfcpp::SHN_UNDEF, // large_common_shndx | |
3517 | 0, // small_common_section_flags | |
3518 | 0, // large_common_section_flags | |
3519 | NULL, // attributes_section | |
3520 | NULL, // attributes_vendor | |
8d9743bd MK |
3521 | "_start", // entry_symbol_name |
3522 | 32, // hash_entry_size | |
053a4d68 JY |
3523 | }; |
3524 | ||
3525 | // Get the GOT section, creating it if necessary. | |
3526 | ||
3527 | template<int size, bool big_endian> | |
3528 | Output_data_got_aarch64<size, big_endian>* | |
3529 | Target_aarch64<size, big_endian>::got_section(Symbol_table* symtab, | |
9363c7c3 | 3530 | Layout* layout) |
053a4d68 JY |
3531 | { |
3532 | if (this->got_ == NULL) | |
3533 | { | |
3534 | gold_assert(symtab != NULL && layout != NULL); | |
3535 | ||
3536 | // When using -z now, we can treat .got.plt as a relro section. | |
3537 | // Without -z now, it is modified after program startup by lazy | |
3538 | // PLT relocations. | |
3539 | bool is_got_plt_relro = parameters->options().now(); | |
3540 | Output_section_order got_order = (is_got_plt_relro | |
3541 | ? ORDER_RELRO | |
3542 | : ORDER_RELRO_LAST); | |
3543 | Output_section_order got_plt_order = (is_got_plt_relro | |
3544 | ? ORDER_RELRO | |
3545 | : ORDER_NON_RELRO_FIRST); | |
3546 | ||
3547 | // Layout of .got and .got.plt sections. | |
3548 | // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_ | |
3549 | // ... | |
3550 | // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT | |
3551 | // .gotplt[1] reserved for ld.so (resolver) | |
3552 | // .gotplt[2] reserved | |
3553 | ||
3554 | // Generate .got section. | |
3555 | this->got_ = new Output_data_got_aarch64<size, big_endian>(symtab, | |
9363c7c3 | 3556 | layout); |
053a4d68 | 3557 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
9363c7c3 JY |
3558 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), |
3559 | this->got_, got_order, true); | |
053a4d68 JY |
3560 | // The first word of GOT is reserved for the address of .dynamic. |
3561 | // We put 0 here now. The value will be replaced later in | |
3562 | // Output_data_got_aarch64::do_write. | |
3563 | this->got_->add_constant(0); | |
3564 | ||
3565 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
3566 | // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section, | |
3567 | // even if there is a .got.plt section. | |
3568 | this->global_offset_table_ = | |
9363c7c3 JY |
3569 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
3570 | Symbol_table::PREDEFINED, | |
3571 | this->got_, | |
3572 | 0, 0, elfcpp::STT_OBJECT, | |
3573 | elfcpp::STB_LOCAL, | |
3574 | elfcpp::STV_HIDDEN, 0, | |
3575 | false, false); | |
053a4d68 JY |
3576 | |
3577 | // Generate .got.plt section. | |
3578 | this->got_plt_ = new Output_data_space(size / 8, "** GOT PLT"); | |
3579 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
9363c7c3 JY |
3580 | (elfcpp::SHF_ALLOC |
3581 | | elfcpp::SHF_WRITE), | |
3582 | this->got_plt_, got_plt_order, | |
3583 | is_got_plt_relro); | |
053a4d68 JY |
3584 | |
3585 | // The first three entries are reserved. | |
9363c7c3 JY |
3586 | this->got_plt_->set_current_data_size( |
3587 | AARCH64_GOTPLT_RESERVE_COUNT * (size / 8)); | |
053a4d68 | 3588 | |
3a531937 JY |
3589 | // If there are any IRELATIVE relocations, they get GOT entries |
3590 | // in .got.plt after the jump slot entries. | |
3591 | this->got_irelative_ = new Output_data_space(size / 8, | |
3592 | "** GOT IRELATIVE PLT"); | |
3593 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
3594 | (elfcpp::SHF_ALLOC | |
3595 | | elfcpp::SHF_WRITE), | |
3596 | this->got_irelative_, | |
3597 | got_plt_order, | |
3598 | is_got_plt_relro); | |
3599 | ||
3600 | // If there are any TLSDESC relocations, they get GOT entries in | |
3601 | // .got.plt after the jump slot and IRELATIVE entries. | |
3602 | this->got_tlsdesc_ = new Output_data_got<size, big_endian>(); | |
3603 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
3604 | (elfcpp::SHF_ALLOC | |
3605 | | elfcpp::SHF_WRITE), | |
3606 | this->got_tlsdesc_, | |
3607 | got_plt_order, | |
3608 | is_got_plt_relro); | |
3609 | ||
053a4d68 | 3610 | if (!is_got_plt_relro) |
9363c7c3 JY |
3611 | { |
3612 | // Those bytes can go into the relro segment. | |
3613 | layout->increase_relro( | |
3614 | AARCH64_GOTPLT_RESERVE_COUNT * (size / 8)); | |
3615 | } | |
053a4d68 JY |
3616 | |
3617 | } | |
3618 | return this->got_; | |
3619 | } | |
3620 | ||
3621 | // Get the dynamic reloc section, creating it if necessary. | |
3622 | ||
3623 | template<int size, bool big_endian> | |
3624 | typename Target_aarch64<size, big_endian>::Reloc_section* | |
3625 | Target_aarch64<size, big_endian>::rela_dyn_section(Layout* layout) | |
3626 | { | |
3627 | if (this->rela_dyn_ == NULL) | |
3628 | { | |
3629 | gold_assert(layout != NULL); | |
3630 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); | |
3631 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
3632 | elfcpp::SHF_ALLOC, this->rela_dyn_, | |
3633 | ORDER_DYNAMIC_RELOCS, false); | |
3634 | } | |
3635 | return this->rela_dyn_; | |
3636 | } | |
3637 | ||
3a531937 JY |
3638 | // Get the section to use for IRELATIVE relocs, creating it if |
3639 | // necessary. These go in .rela.dyn, but only after all other dynamic | |
3640 | // relocations. They need to follow the other dynamic relocations so | |
3641 | // that they can refer to global variables initialized by those | |
3642 | // relocs. | |
3643 | ||
3644 | template<int size, bool big_endian> | |
3645 | typename Target_aarch64<size, big_endian>::Reloc_section* | |
3646 | Target_aarch64<size, big_endian>::rela_irelative_section(Layout* layout) | |
3647 | { | |
3648 | if (this->rela_irelative_ == NULL) | |
3649 | { | |
3650 | // Make sure we have already created the dynamic reloc section. | |
3651 | this->rela_dyn_section(layout); | |
3652 | this->rela_irelative_ = new Reloc_section(false); | |
3653 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
3654 | elfcpp::SHF_ALLOC, this->rela_irelative_, | |
3655 | ORDER_DYNAMIC_RELOCS, false); | |
3656 | gold_assert(this->rela_dyn_->output_section() | |
3657 | == this->rela_irelative_->output_section()); | |
3658 | } | |
3659 | return this->rela_irelative_; | |
3660 | } | |
3661 | ||
3662 | ||
83a01957 HS |
3663 | // do_make_elf_object to override the same function in the base class. We need |
3664 | // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to | |
3665 | // store backend specific information. Hence we need to have our own ELF object | |
3666 | // creation. | |
3667 | ||
3668 | template<int size, bool big_endian> | |
3669 | Object* | |
3670 | Target_aarch64<size, big_endian>::do_make_elf_object( | |
3671 | const std::string& name, | |
3672 | Input_file* input_file, | |
3673 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
3674 | { | |
3675 | int et = ehdr.get_e_type(); | |
3676 | // ET_EXEC files are valid input for --just-symbols/-R, | |
3677 | // and we treat them as relocatable objects. | |
3678 | if (et == elfcpp::ET_EXEC && input_file->just_symbols()) | |
3679 | return Sized_target<size, big_endian>::do_make_elf_object( | |
3680 | name, input_file, offset, ehdr); | |
3681 | else if (et == elfcpp::ET_REL) | |
3682 | { | |
3683 | AArch64_relobj<size, big_endian>* obj = | |
3684 | new AArch64_relobj<size, big_endian>(name, input_file, offset, ehdr); | |
3685 | obj->setup(); | |
3686 | return obj; | |
3687 | } | |
3688 | else if (et == elfcpp::ET_DYN) | |
3689 | { | |
3690 | // Keep base implementation. | |
3691 | Sized_dynobj<size, big_endian>* obj = | |
3692 | new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); | |
3693 | obj->setup(); | |
3694 | return obj; | |
3695 | } | |
3696 | else | |
3697 | { | |
3698 | gold_error(_("%s: unsupported ELF file type %d"), | |
3699 | name.c_str(), et); | |
3700 | return NULL; | |
3701 | } | |
3702 | } | |
3703 | ||
3704 | ||
3705 | // Scan a relocation for stub generation. | |
3706 | ||
3707 | template<int size, bool big_endian> | |
3708 | void | |
3709 | Target_aarch64<size, big_endian>::scan_reloc_for_stub( | |
3710 | const Relocate_info<size, big_endian>* relinfo, | |
3711 | unsigned int r_type, | |
3712 | const Sized_symbol<size>* gsym, | |
3713 | unsigned int r_sym, | |
3714 | const Symbol_value<size>* psymval, | |
3715 | typename elfcpp::Elf_types<size>::Elf_Swxword addend, | |
3716 | Address address) | |
3717 | { | |
3718 | const AArch64_relobj<size, big_endian>* aarch64_relobj = | |
3719 | static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object); | |
3720 | ||
3721 | Symbol_value<size> symval; | |
3722 | if (gsym != NULL) | |
3723 | { | |
3724 | const AArch64_reloc_property* arp = aarch64_reloc_property_table-> | |
3725 | get_reloc_property(r_type); | |
3726 | if (gsym->use_plt_offset(arp->reference_flags())) | |
3727 | { | |
3728 | // This uses a PLT, change the symbol value. | |
3729 | symval.set_output_value(this->plt_section()->address() | |
3730 | + gsym->plt_offset()); | |
3731 | psymval = &symval; | |
3732 | } | |
3733 | else if (gsym->is_undefined()) | |
3734 | // There is no need to generate a stub symbol is undefined. | |
3735 | return; | |
3736 | } | |
3737 | ||
3738 | // Get the symbol value. | |
3739 | typename Symbol_value<size>::Value value = psymval->value(aarch64_relobj, 0); | |
3740 | ||
3741 | // Owing to pipelining, the PC relative branches below actually skip | |
3742 | // two instructions when the branch offset is 0. | |
3743 | Address destination = static_cast<Address>(-1); | |
3744 | switch (r_type) | |
3745 | { | |
3746 | case elfcpp::R_AARCH64_CALL26: | |
3747 | case elfcpp::R_AARCH64_JUMP26: | |
3748 | destination = value + addend; | |
3749 | break; | |
3750 | default: | |
9726c3c1 | 3751 | gold_unreachable(); |
83a01957 HS |
3752 | } |
3753 | ||
a48d0c12 | 3754 | int stub_type = The_reloc_stub:: |
83a01957 | 3755 | stub_type_for_reloc(r_type, address, destination); |
a48d0c12 | 3756 | if (stub_type == ST_NONE) |
5019d64a | 3757 | return; |
83a01957 HS |
3758 | |
3759 | The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx); | |
3760 | gold_assert(stub_table != NULL); | |
3761 | ||
3762 | The_reloc_stub_key key(stub_type, gsym, aarch64_relobj, r_sym, addend); | |
3763 | The_reloc_stub* stub = stub_table->find_reloc_stub(key); | |
3764 | if (stub == NULL) | |
3765 | { | |
3766 | stub = new The_reloc_stub(stub_type); | |
3767 | stub_table->add_reloc_stub(stub, key); | |
3768 | } | |
3769 | stub->set_destination_address(destination); | |
3770 | } // End of Target_aarch64::scan_reloc_for_stub | |
3771 | ||
3772 | ||
3773 | // This function scans a relocation section for stub generation. | |
3774 | // The template parameter Relocate must be a class type which provides | |
3775 | // a single function, relocate(), which implements the machine | |
3776 | // specific part of a relocation. | |
3777 | ||
3778 | // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type: | |
3779 | // SHT_REL or SHT_RELA. | |
3780 | ||
3781 | // PRELOCS points to the relocation data. RELOC_COUNT is the number | |
3782 | // of relocs. OUTPUT_SECTION is the output section. | |
3783 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be | |
3784 | // mapped to output offsets. | |
3785 | ||
3786 | // VIEW is the section data, VIEW_ADDRESS is its memory address, and | |
3787 | // VIEW_SIZE is the size. These refer to the input section, unless | |
3788 | // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to | |
3789 | // the output section. | |
3790 | ||
3791 | template<int size, bool big_endian> | |
3792 | template<int sh_type> | |
3793 | void inline | |
3794 | Target_aarch64<size, big_endian>::scan_reloc_section_for_stubs( | |
3795 | const Relocate_info<size, big_endian>* relinfo, | |
3796 | const unsigned char* prelocs, | |
3797 | size_t reloc_count, | |
3798 | Output_section* /*output_section*/, | |
3799 | bool /*needs_special_offset_handling*/, | |
3800 | const unsigned char* /*view*/, | |
3801 | Address view_address, | |
3802 | section_size_type) | |
3803 | { | |
3804 | typedef typename Reloc_types<sh_type,size,big_endian>::Reloc Reltype; | |
3805 | ||
3806 | const int reloc_size = | |
3807 | Reloc_types<sh_type,size,big_endian>::reloc_size; | |
3808 | AArch64_relobj<size, big_endian>* object = | |
3809 | static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object); | |
3810 | unsigned int local_count = object->local_symbol_count(); | |
3811 | ||
3812 | gold::Default_comdat_behavior default_comdat_behavior; | |
3813 | Comdat_behavior comdat_behavior = CB_UNDETERMINED; | |
3814 | ||
3815 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) | |
3816 | { | |
3817 | Reltype reloc(prelocs); | |
3818 | typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); | |
3819 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
3820 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); | |
3821 | if (r_type != elfcpp::R_AARCH64_CALL26 | |
3822 | && r_type != elfcpp::R_AARCH64_JUMP26) | |
3823 | continue; | |
3824 | ||
3825 | section_offset_type offset = | |
3826 | convert_to_section_size_type(reloc.get_r_offset()); | |
3827 | ||
3828 | // Get the addend. | |
3829 | typename elfcpp::Elf_types<size>::Elf_Swxword addend = | |
3830 | reloc.get_r_addend(); | |
3831 | ||
3832 | const Sized_symbol<size>* sym; | |
3833 | Symbol_value<size> symval; | |
3834 | const Symbol_value<size> *psymval; | |
3835 | bool is_defined_in_discarded_section; | |
3836 | unsigned int shndx; | |
3837 | if (r_sym < local_count) | |
3838 | { | |
3839 | sym = NULL; | |
3840 | psymval = object->local_symbol(r_sym); | |
3841 | ||
3842 | // If the local symbol belongs to a section we are discarding, | |
3843 | // and that section is a debug section, try to find the | |
3844 | // corresponding kept section and map this symbol to its | |
3845 | // counterpart in the kept section. The symbol must not | |
3846 | // correspond to a section we are folding. | |
3847 | bool is_ordinary; | |
3848 | shndx = psymval->input_shndx(&is_ordinary); | |
3849 | is_defined_in_discarded_section = | |
3850 | (is_ordinary | |
3851 | && shndx != elfcpp::SHN_UNDEF | |
3852 | && !object->is_section_included(shndx) | |
3853 | && !relinfo->symtab->is_section_folded(object, shndx)); | |
3854 | ||
3855 | // We need to compute the would-be final value of this local | |
3856 | // symbol. | |
3857 | if (!is_defined_in_discarded_section) | |
3858 | { | |
3859 | typedef Sized_relobj_file<size, big_endian> ObjType; | |
3860 | typename ObjType::Compute_final_local_value_status status = | |
3861 | object->compute_final_local_value(r_sym, psymval, &symval, | |
3862 | relinfo->symtab); | |
3863 | if (status == ObjType::CFLV_OK) | |
3864 | { | |
3865 | // Currently we cannot handle a branch to a target in | |
3866 | // a merged section. If this is the case, issue an error | |
3867 | // and also free the merge symbol value. | |
3868 | if (!symval.has_output_value()) | |
3869 | { | |
3870 | const std::string& section_name = | |
3871 | object->section_name(shndx); | |
3872 | object->error(_("cannot handle branch to local %u " | |
3873 | "in a merged section %s"), | |
3874 | r_sym, section_name.c_str()); | |
3875 | } | |
3876 | psymval = &symval; | |
3877 | } | |
3878 | else | |
3879 | { | |
3880 | // We cannot determine the final value. | |
3881 | continue; | |
3882 | } | |
3883 | } | |
3884 | } | |
3885 | else | |
3886 | { | |
3887 | const Symbol* gsym; | |
3888 | gsym = object->global_symbol(r_sym); | |
3889 | gold_assert(gsym != NULL); | |
3890 | if (gsym->is_forwarder()) | |
3891 | gsym = relinfo->symtab->resolve_forwards(gsym); | |
3892 | ||
3893 | sym = static_cast<const Sized_symbol<size>*>(gsym); | |
3894 | if (sym->has_symtab_index() && sym->symtab_index() != -1U) | |
3895 | symval.set_output_symtab_index(sym->symtab_index()); | |
3896 | else | |
3897 | symval.set_no_output_symtab_entry(); | |
3898 | ||
3899 | // We need to compute the would-be final value of this global | |
3900 | // symbol. | |
3901 | const Symbol_table* symtab = relinfo->symtab; | |
3902 | const Sized_symbol<size>* sized_symbol = | |
3903 | symtab->get_sized_symbol<size>(gsym); | |
3904 | Symbol_table::Compute_final_value_status status; | |
3905 | typename elfcpp::Elf_types<size>::Elf_Addr value = | |
3906 | symtab->compute_final_value<size>(sized_symbol, &status); | |
3907 | ||
3908 | // Skip this if the symbol has not output section. | |
3909 | if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION) | |
3910 | continue; | |
3911 | symval.set_output_value(value); | |
3912 | ||
3913 | if (gsym->type() == elfcpp::STT_TLS) | |
3914 | symval.set_is_tls_symbol(); | |
3915 | else if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
3916 | symval.set_is_ifunc_symbol(); | |
3917 | psymval = &symval; | |
3918 | ||
3919 | is_defined_in_discarded_section = | |
3920 | (gsym->is_defined_in_discarded_section() | |
3921 | && gsym->is_undefined()); | |
3922 | shndx = 0; | |
3923 | } | |
3924 | ||
3925 | Symbol_value<size> symval2; | |
3926 | if (is_defined_in_discarded_section) | |
3927 | { | |
3928 | if (comdat_behavior == CB_UNDETERMINED) | |
3929 | { | |
3930 | std::string name = object->section_name(relinfo->data_shndx); | |
3931 | comdat_behavior = default_comdat_behavior.get(name.c_str()); | |
3932 | } | |
3933 | if (comdat_behavior == CB_PRETEND) | |
3934 | { | |
3935 | bool found; | |
3936 | typename elfcpp::Elf_types<size>::Elf_Addr value = | |
3937 | object->map_to_kept_section(shndx, &found); | |
3938 | if (found) | |
3939 | symval2.set_output_value(value + psymval->input_value()); | |
3940 | else | |
3941 | symval2.set_output_value(0); | |
3942 | } | |
3943 | else | |
3944 | { | |
3945 | if (comdat_behavior == CB_WARNING) | |
3946 | gold_warning_at_location(relinfo, i, offset, | |
3947 | _("relocation refers to discarded " | |
3948 | "section")); | |
3949 | symval2.set_output_value(0); | |
3950 | } | |
3951 | symval2.set_no_output_symtab_entry(); | |
3952 | psymval = &symval2; | |
3953 | } | |
3954 | ||
3955 | // If symbol is a section symbol, we don't know the actual type of | |
3956 | // destination. Give up. | |
3957 | if (psymval->is_section_symbol()) | |
3958 | continue; | |
3959 | ||
3960 | this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval, | |
3961 | addend, view_address + offset); | |
3962 | } // End of iterating relocs in a section | |
3963 | } // End of Target_aarch64::scan_reloc_section_for_stubs | |
3964 | ||
3965 | ||
3966 | // Scan an input section for stub generation. | |
3967 | ||
3968 | template<int size, bool big_endian> | |
3969 | void | |
3970 | Target_aarch64<size, big_endian>::scan_section_for_stubs( | |
3971 | const Relocate_info<size, big_endian>* relinfo, | |
3972 | unsigned int sh_type, | |
3973 | const unsigned char* prelocs, | |
3974 | size_t reloc_count, | |
3975 | Output_section* output_section, | |
3976 | bool needs_special_offset_handling, | |
3977 | const unsigned char* view, | |
3978 | Address view_address, | |
3979 | section_size_type view_size) | |
3980 | { | |
3981 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3982 | this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>( | |
3983 | relinfo, | |
3984 | prelocs, | |
3985 | reloc_count, | |
3986 | output_section, | |
3987 | needs_special_offset_handling, | |
3988 | view, | |
3989 | view_address, | |
3990 | view_size); | |
3991 | } | |
3992 | ||
3993 | ||
3994 | // Relocate a single stub. | |
3995 | ||
3996 | template<int size, bool big_endian> | |
3997 | void Target_aarch64<size, big_endian>:: | |
3998 | relocate_stub(The_reloc_stub* stub, | |
3999 | const The_relocate_info*, | |
4000 | Output_section*, | |
4001 | unsigned char* view, | |
4002 | Address address, | |
4003 | section_size_type) | |
4004 | { | |
4005 | typedef AArch64_relocate_functions<size, big_endian> The_reloc_functions; | |
4006 | typedef typename The_reloc_functions::Status The_reloc_functions_status; | |
4007 | typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype; | |
4008 | ||
4009 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
a48d0c12 HS |
4010 | int insn_number = stub->insn_num(); |
4011 | const uint32_t* insns = stub->insns(); | |
83a01957 HS |
4012 | // Check the insns are really those stub insns. |
4013 | for (int i = 0; i < insn_number; ++i) | |
4014 | { | |
4015 | Insntype insn = elfcpp::Swap<32,big_endian>::readval(ip + i); | |
a48d0c12 | 4016 | gold_assert(((uint32_t)insn == insns[i])); |
83a01957 HS |
4017 | } |
4018 | ||
4019 | Address dest = stub->destination_address(); | |
4020 | ||
a48d0c12 | 4021 | switch(stub->type()) |
83a01957 | 4022 | { |
a48d0c12 | 4023 | case ST_ADRP_BRANCH: |
83a01957 HS |
4024 | { |
4025 | // 1st reloc is ADR_PREL_PG_HI21 | |
4026 | The_reloc_functions_status status = | |
4027 | The_reloc_functions::adrp(view, dest, address); | |
4028 | // An error should never arise in the above step. If so, please | |
4029 | // check 'aarch64_valid_for_adrp_p'. | |
4030 | gold_assert(status == The_reloc_functions::STATUS_OKAY); | |
4031 | ||
4032 | // 2nd reloc is ADD_ABS_LO12_NC | |
4033 | const AArch64_reloc_property* arp = | |
4034 | aarch64_reloc_property_table->get_reloc_property( | |
4035 | elfcpp::R_AARCH64_ADD_ABS_LO12_NC); | |
4036 | gold_assert(arp != NULL); | |
4037 | status = The_reloc_functions::template | |
4038 | rela_general<32>(view + 4, dest, 0, arp); | |
4039 | // An error should never arise, it is an "_NC" relocation. | |
4040 | gold_assert(status == The_reloc_functions::STATUS_OKAY); | |
4041 | } | |
4042 | break; | |
4043 | ||
a48d0c12 | 4044 | case ST_LONG_BRANCH_ABS: |
83a01957 HS |
4045 | // 1st reloc is R_AARCH64_PREL64, at offset 8 |
4046 | elfcpp::Swap<64,big_endian>::writeval(view + 8, dest); | |
4047 | break; | |
4048 | ||
a48d0c12 | 4049 | case ST_LONG_BRANCH_PCREL: |
83a01957 HS |
4050 | { |
4051 | // "PC" calculation is the 2nd insn in the stub. | |
4052 | uint64_t offset = dest - (address + 4); | |
4053 | // Offset is placed at offset 4 and 5. | |
4054 | elfcpp::Swap<64,big_endian>::writeval(view + 16, offset); | |
4055 | } | |
4056 | break; | |
4057 | ||
4058 | default: | |
9726c3c1 | 4059 | gold_unreachable(); |
83a01957 HS |
4060 | } |
4061 | } | |
4062 | ||
4063 | ||
053a4d68 JY |
4064 | // A class to handle the PLT data. |
4065 | // This is an abstract base class that handles most of the linker details | |
4066 | // but does not know the actual contents of PLT entries. The derived | |
4067 | // classes below fill in those details. | |
4068 | ||
4069 | template<int size, bool big_endian> | |
4070 | class Output_data_plt_aarch64 : public Output_section_data | |
4071 | { | |
4072 | public: | |
4073 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> | |
4074 | Reloc_section; | |
4075 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
4076 | ||
4077 | Output_data_plt_aarch64(Layout* layout, | |
9363c7c3 | 4078 | uint64_t addralign, |
3a531937 JY |
4079 | Output_data_got_aarch64<size, big_endian>* got, |
4080 | Output_data_space* got_plt, | |
4081 | Output_data_space* got_irelative) | |
9726c3c1 | 4082 | : Output_section_data(addralign), tlsdesc_rel_(NULL), irelative_rel_(NULL), |
3a531937 JY |
4083 | got_(got), got_plt_(got_plt), got_irelative_(got_irelative), |
4084 | count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U) | |
053a4d68 JY |
4085 | { this->init(layout); } |
4086 | ||
4087 | // Initialize the PLT section. | |
4088 | void | |
4089 | init(Layout* layout); | |
4090 | ||
4091 | // Add an entry to the PLT. | |
4092 | void | |
9726c3c1 HS |
4093 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
4094 | ||
4095 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
4096 | unsigned int | |
4097 | add_local_ifunc_entry(Symbol_table* symtab, Layout*, | |
4098 | Sized_relobj_file<size, big_endian>* relobj, | |
4099 | unsigned int local_sym_index); | |
4100 | ||
4101 | // Add the relocation for a PLT entry. | |
4102 | void | |
4103 | add_relocation(Symbol_table*, Layout*, Symbol* gsym, | |
4104 | unsigned int got_offset); | |
053a4d68 | 4105 | |
3a531937 JY |
4106 | // Add the reserved TLSDESC_PLT entry to the PLT. |
4107 | void | |
4108 | reserve_tlsdesc_entry(unsigned int got_offset) | |
4109 | { this->tlsdesc_got_offset_ = got_offset; } | |
4110 | ||
4111 | // Return true if a TLSDESC_PLT entry has been reserved. | |
4112 | bool | |
4113 | has_tlsdesc_entry() const | |
4114 | { return this->tlsdesc_got_offset_ != -1U; } | |
4115 | ||
4116 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
4117 | unsigned int | |
4118 | get_tlsdesc_got_offset() const | |
4119 | { return this->tlsdesc_got_offset_; } | |
4120 | ||
4121 | // Return the PLT offset of the reserved TLSDESC_PLT entry. | |
4122 | unsigned int | |
4123 | get_tlsdesc_plt_offset() const | |
4124 | { | |
4125 | return (this->first_plt_entry_offset() + | |
4126 | (this->count_ + this->irelative_count_) | |
4127 | * this->get_plt_entry_size()); | |
4128 | } | |
4129 | ||
053a4d68 JY |
4130 | // Return the .rela.plt section data. |
4131 | Reloc_section* | |
4132 | rela_plt() | |
4133 | { return this->rel_; } | |
4134 | ||
3a531937 JY |
4135 | // Return where the TLSDESC relocations should go. |
4136 | Reloc_section* | |
4137 | rela_tlsdesc(Layout*); | |
4138 | ||
4139 | // Return where the IRELATIVE relocations should go in the PLT | |
4140 | // relocations. | |
4141 | Reloc_section* | |
4142 | rela_irelative(Symbol_table*, Layout*); | |
4143 | ||
9363c7c3 JY |
4144 | // Return whether we created a section for IRELATIVE relocations. |
4145 | bool | |
4146 | has_irelative_section() const | |
4147 | { return this->irelative_rel_ != NULL; } | |
4148 | ||
053a4d68 JY |
4149 | // Return the number of PLT entries. |
4150 | unsigned int | |
4151 | entry_count() const | |
3a531937 | 4152 | { return this->count_ + this->irelative_count_; } |
053a4d68 JY |
4153 | |
4154 | // Return the offset of the first non-reserved PLT entry. | |
4155 | unsigned int | |
3a531937 | 4156 | first_plt_entry_offset() const |
053a4d68 JY |
4157 | { return this->do_first_plt_entry_offset(); } |
4158 | ||
4159 | // Return the size of a PLT entry. | |
4160 | unsigned int | |
4161 | get_plt_entry_size() const | |
4162 | { return this->do_get_plt_entry_size(); } | |
4163 | ||
3a531937 JY |
4164 | // Return the reserved tlsdesc entry size. |
4165 | unsigned int | |
4166 | get_plt_tlsdesc_entry_size() const | |
4167 | { return this->do_get_plt_tlsdesc_entry_size(); } | |
4168 | ||
9363c7c3 JY |
4169 | // Return the PLT address to use for a global symbol. |
4170 | uint64_t | |
4171 | address_for_global(const Symbol*); | |
4172 | ||
4173 | // Return the PLT address to use for a local symbol. | |
4174 | uint64_t | |
4175 | address_for_local(const Relobj*, unsigned int symndx); | |
4176 | ||
053a4d68 JY |
4177 | protected: |
4178 | // Fill in the first PLT entry. | |
4179 | void | |
4180 | fill_first_plt_entry(unsigned char* pov, | |
4181 | Address got_address, | |
4182 | Address plt_address) | |
4183 | { this->do_fill_first_plt_entry(pov, got_address, plt_address); } | |
4184 | ||
4185 | // Fill in a normal PLT entry. | |
4186 | void | |
4187 | fill_plt_entry(unsigned char* pov, | |
4188 | Address got_address, | |
4189 | Address plt_address, | |
4190 | unsigned int got_offset, | |
4191 | unsigned int plt_offset) | |
4192 | { | |
4193 | this->do_fill_plt_entry(pov, got_address, plt_address, | |
4194 | got_offset, plt_offset); | |
4195 | } | |
4196 | ||
3a531937 JY |
4197 | // Fill in the reserved TLSDESC PLT entry. |
4198 | void | |
4199 | fill_tlsdesc_entry(unsigned char* pov, | |
4200 | Address gotplt_address, | |
4201 | Address plt_address, | |
4202 | Address got_base, | |
4203 | unsigned int tlsdesc_got_offset, | |
4204 | unsigned int plt_offset) | |
4205 | { | |
4206 | this->do_fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base, | |
4207 | tlsdesc_got_offset, plt_offset); | |
4208 | } | |
4209 | ||
053a4d68 JY |
4210 | virtual unsigned int |
4211 | do_first_plt_entry_offset() const = 0; | |
4212 | ||
4213 | virtual unsigned int | |
4214 | do_get_plt_entry_size() const = 0; | |
4215 | ||
3a531937 JY |
4216 | virtual unsigned int |
4217 | do_get_plt_tlsdesc_entry_size() const = 0; | |
4218 | ||
053a4d68 JY |
4219 | virtual void |
4220 | do_fill_first_plt_entry(unsigned char* pov, | |
4221 | Address got_addr, | |
4222 | Address plt_addr) = 0; | |
4223 | ||
4224 | virtual void | |
4225 | do_fill_plt_entry(unsigned char* pov, | |
4226 | Address got_address, | |
4227 | Address plt_address, | |
4228 | unsigned int got_offset, | |
4229 | unsigned int plt_offset) = 0; | |
4230 | ||
3a531937 JY |
4231 | virtual void |
4232 | do_fill_tlsdesc_entry(unsigned char* pov, | |
4233 | Address gotplt_address, | |
4234 | Address plt_address, | |
4235 | Address got_base, | |
4236 | unsigned int tlsdesc_got_offset, | |
4237 | unsigned int plt_offset) = 0; | |
4238 | ||
053a4d68 JY |
4239 | void |
4240 | do_adjust_output_section(Output_section* os); | |
4241 | ||
4242 | // Write to a map file. | |
4243 | void | |
4244 | do_print_to_mapfile(Mapfile* mapfile) const | |
4245 | { mapfile->print_output_data(this, _("** PLT")); } | |
4246 | ||
4247 | private: | |
4248 | // Set the final size. | |
4249 | void | |
4250 | set_final_data_size(); | |
4251 | ||
4252 | // Write out the PLT data. | |
4253 | void | |
4254 | do_write(Output_file*); | |
4255 | ||
4256 | // The reloc section. | |
4257 | Reloc_section* rel_; | |
3a531937 JY |
4258 | |
4259 | // The TLSDESC relocs, if necessary. These must follow the regular | |
4260 | // PLT relocs. | |
4261 | Reloc_section* tlsdesc_rel_; | |
4262 | ||
9363c7c3 JY |
4263 | // The IRELATIVE relocs, if necessary. These must follow the |
4264 | // regular PLT relocations. | |
4265 | Reloc_section* irelative_rel_; | |
3a531937 | 4266 | |
053a4d68 JY |
4267 | // The .got section. |
4268 | Output_data_got_aarch64<size, big_endian>* got_; | |
3a531937 | 4269 | |
053a4d68 JY |
4270 | // The .got.plt section. |
4271 | Output_data_space* got_plt_; | |
3a531937 JY |
4272 | |
4273 | // The part of the .got.plt section used for IRELATIVE relocs. | |
4274 | Output_data_space* got_irelative_; | |
4275 | ||
053a4d68 JY |
4276 | // The number of PLT entries. |
4277 | unsigned int count_; | |
3a531937 | 4278 | |
fa89cc82 | 4279 | // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These |
3a531937 JY |
4280 | // follow the regular PLT entries. |
4281 | unsigned int irelative_count_; | |
4282 | ||
4283 | // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline. | |
4284 | // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1 | |
4285 | // indicates an offset is not allocated. | |
4286 | unsigned int tlsdesc_got_offset_; | |
053a4d68 JY |
4287 | }; |
4288 | ||
4289 | // Initialize the PLT section. | |
4290 | ||
4291 | template<int size, bool big_endian> | |
4292 | void | |
4293 | Output_data_plt_aarch64<size, big_endian>::init(Layout* layout) | |
4294 | { | |
4295 | this->rel_ = new Reloc_section(false); | |
4296 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
4297 | elfcpp::SHF_ALLOC, this->rel_, | |
4298 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
4299 | } | |
4300 | ||
4301 | template<int size, bool big_endian> | |
4302 | void | |
4303 | Output_data_plt_aarch64<size, big_endian>::do_adjust_output_section( | |
4304 | Output_section* os) | |
4305 | { | |
4306 | os->set_entsize(this->get_plt_entry_size()); | |
4307 | } | |
4308 | ||
4309 | // Add an entry to the PLT. | |
4310 | ||
4311 | template<int size, bool big_endian> | |
4312 | void | |
9726c3c1 HS |
4313 | Output_data_plt_aarch64<size, big_endian>::add_entry(Symbol_table* symtab, |
4314 | Layout* layout, Symbol* gsym) | |
053a4d68 JY |
4315 | { |
4316 | gold_assert(!gsym->has_plt_offset()); | |
9363c7c3 | 4317 | |
9726c3c1 HS |
4318 | unsigned int* pcount; |
4319 | unsigned int plt_reserved; | |
4320 | Output_section_data_build* got; | |
9363c7c3 | 4321 | |
9726c3c1 HS |
4322 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
4323 | && gsym->can_use_relative_reloc(false)) | |
4324 | { | |
4325 | pcount = &this->irelative_count_; | |
4326 | plt_reserved = 0; | |
4327 | got = this->got_irelative_; | |
4328 | } | |
4329 | else | |
4330 | { | |
4331 | pcount = &this->count_; | |
4332 | plt_reserved = this->first_plt_entry_offset(); | |
4333 | got = this->got_plt_; | |
4334 | } | |
9363c7c3 | 4335 | |
9726c3c1 HS |
4336 | gsym->set_plt_offset((*pcount) * this->get_plt_entry_size() |
4337 | + plt_reserved); | |
4338 | ||
4339 | ++*pcount; | |
4340 | ||
4341 | section_offset_type got_offset = got->current_data_size(); | |
9363c7c3 JY |
4342 | |
4343 | // Every PLT entry needs a GOT entry which points back to the PLT | |
4344 | // entry (this will be changed by the dynamic linker, normally | |
4345 | // lazily when the function is called). | |
9726c3c1 | 4346 | got->set_current_data_size(got_offset + size / 8); |
9363c7c3 JY |
4347 | |
4348 | // Every PLT entry needs a reloc. | |
9726c3c1 | 4349 | this->add_relocation(symtab, layout, gsym, got_offset); |
9363c7c3 JY |
4350 | |
4351 | // Note that we don't need to save the symbol. The contents of the | |
4352 | // PLT are independent of which symbols are used. The symbols only | |
4353 | // appear in the relocations. | |
4354 | } | |
4355 | ||
9726c3c1 HS |
4356 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
4357 | // the PLT offset. | |
4358 | ||
4359 | template<int size, bool big_endian> | |
4360 | unsigned int | |
4361 | Output_data_plt_aarch64<size, big_endian>::add_local_ifunc_entry( | |
4362 | Symbol_table* symtab, | |
4363 | Layout* layout, | |
4364 | Sized_relobj_file<size, big_endian>* relobj, | |
4365 | unsigned int local_sym_index) | |
4366 | { | |
4367 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); | |
4368 | ++this->irelative_count_; | |
4369 | ||
4370 | section_offset_type got_offset = this->got_irelative_->current_data_size(); | |
4371 | ||
4372 | // Every PLT entry needs a GOT entry which points back to the PLT | |
4373 | // entry. | |
4374 | this->got_irelative_->set_current_data_size(got_offset + size / 8); | |
4375 | ||
4376 | // Every PLT entry needs a reloc. | |
4377 | Reloc_section* rela = this->rela_irelative(symtab, layout); | |
4378 | rela->add_symbolless_local_addend(relobj, local_sym_index, | |
4379 | elfcpp::R_AARCH64_IRELATIVE, | |
4380 | this->got_irelative_, got_offset, 0); | |
4381 | ||
4382 | return plt_offset; | |
4383 | } | |
4384 | ||
4385 | // Add the relocation for a PLT entry. | |
4386 | ||
4387 | template<int size, bool big_endian> | |
4388 | void | |
4389 | Output_data_plt_aarch64<size, big_endian>::add_relocation( | |
4390 | Symbol_table* symtab, Layout* layout, Symbol* gsym, unsigned int got_offset) | |
4391 | { | |
4392 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
4393 | && gsym->can_use_relative_reloc(false)) | |
4394 | { | |
4395 | Reloc_section* rela = this->rela_irelative(symtab, layout); | |
4396 | rela->add_symbolless_global_addend(gsym, elfcpp::R_AARCH64_IRELATIVE, | |
4397 | this->got_irelative_, got_offset, 0); | |
4398 | } | |
4399 | else | |
4400 | { | |
4401 | gsym->set_needs_dynsym_entry(); | |
4402 | this->rel_->add_global(gsym, elfcpp::R_AARCH64_JUMP_SLOT, this->got_plt_, | |
4403 | got_offset, 0); | |
4404 | } | |
4405 | } | |
4406 | ||
3a531937 JY |
4407 | // Return where the TLSDESC relocations should go, creating it if |
4408 | // necessary. These follow the JUMP_SLOT relocations. | |
4409 | ||
4410 | template<int size, bool big_endian> | |
4411 | typename Output_data_plt_aarch64<size, big_endian>::Reloc_section* | |
4412 | Output_data_plt_aarch64<size, big_endian>::rela_tlsdesc(Layout* layout) | |
4413 | { | |
4414 | if (this->tlsdesc_rel_ == NULL) | |
4415 | { | |
4416 | this->tlsdesc_rel_ = new Reloc_section(false); | |
4417 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
4418 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
4419 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
4420 | gold_assert(this->tlsdesc_rel_->output_section() | |
4421 | == this->rel_->output_section()); | |
4422 | } | |
4423 | return this->tlsdesc_rel_; | |
4424 | } | |
4425 | ||
4426 | // Return where the IRELATIVE relocations should go in the PLT. These | |
4427 | // follow the JUMP_SLOT and the TLSDESC relocations. | |
4428 | ||
4429 | template<int size, bool big_endian> | |
4430 | typename Output_data_plt_aarch64<size, big_endian>::Reloc_section* | |
4431 | Output_data_plt_aarch64<size, big_endian>::rela_irelative(Symbol_table* symtab, | |
4432 | Layout* layout) | |
4433 | { | |
4434 | if (this->irelative_rel_ == NULL) | |
4435 | { | |
4436 | // Make sure we have a place for the TLSDESC relocations, in | |
4437 | // case we see any later on. | |
4438 | this->rela_tlsdesc(layout); | |
4439 | this->irelative_rel_ = new Reloc_section(false); | |
4440 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
4441 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
4442 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
4443 | gold_assert(this->irelative_rel_->output_section() | |
4444 | == this->rel_->output_section()); | |
4445 | ||
4446 | if (parameters->doing_static_link()) | |
4447 | { | |
4448 | // A statically linked executable will only have a .rela.plt | |
4449 | // section to hold R_AARCH64_IRELATIVE relocs for | |
4450 | // STT_GNU_IFUNC symbols. The library will use these | |
4451 | // symbols to locate the IRELATIVE relocs at program startup | |
4452 | // time. | |
4453 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
4454 | Symbol_table::PREDEFINED, | |
4455 | this->irelative_rel_, 0, 0, | |
4456 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
4457 | elfcpp::STV_HIDDEN, 0, false, true); | |
4458 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
4459 | Symbol_table::PREDEFINED, | |
4460 | this->irelative_rel_, 0, 0, | |
4461 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
4462 | elfcpp::STV_HIDDEN, 0, true, true); | |
4463 | } | |
4464 | } | |
4465 | return this->irelative_rel_; | |
4466 | } | |
4467 | ||
9363c7c3 JY |
4468 | // Return the PLT address to use for a global symbol. |
4469 | ||
4470 | template<int size, bool big_endian> | |
4471 | uint64_t | |
4472 | Output_data_plt_aarch64<size, big_endian>::address_for_global( | |
4473 | const Symbol* gsym) | |
4474 | { | |
4475 | uint64_t offset = 0; | |
4476 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
4477 | && gsym->can_use_relative_reloc(false)) | |
4478 | offset = (this->first_plt_entry_offset() + | |
4479 | this->count_ * this->get_plt_entry_size()); | |
4480 | return this->address() + offset + gsym->plt_offset(); | |
4481 | } | |
4482 | ||
4483 | // Return the PLT address to use for a local symbol. These are always | |
4484 | // IRELATIVE relocs. | |
4485 | ||
4486 | template<int size, bool big_endian> | |
4487 | uint64_t | |
4488 | Output_data_plt_aarch64<size, big_endian>::address_for_local( | |
4489 | const Relobj* object, | |
4490 | unsigned int r_sym) | |
4491 | { | |
4492 | return (this->address() | |
4493 | + this->first_plt_entry_offset() | |
4494 | + this->count_ * this->get_plt_entry_size() | |
4495 | + object->local_plt_offset(r_sym)); | |
053a4d68 JY |
4496 | } |
4497 | ||
4498 | // Set the final size. | |
9363c7c3 | 4499 | |
053a4d68 JY |
4500 | template<int size, bool big_endian> |
4501 | void | |
4502 | Output_data_plt_aarch64<size, big_endian>::set_final_data_size() | |
4503 | { | |
3a531937 JY |
4504 | unsigned int count = this->count_ + this->irelative_count_; |
4505 | unsigned int extra_size = 0; | |
4506 | if (this->has_tlsdesc_entry()) | |
4507 | extra_size += this->get_plt_tlsdesc_entry_size(); | |
053a4d68 | 4508 | this->set_data_size(this->first_plt_entry_offset() |
3a531937 JY |
4509 | + count * this->get_plt_entry_size() |
4510 | + extra_size); | |
053a4d68 JY |
4511 | } |
4512 | ||
4513 | template<int size, bool big_endian> | |
4514 | class Output_data_plt_aarch64_standard : | |
4515 | public Output_data_plt_aarch64<size, big_endian> | |
4516 | { | |
4517 | public: | |
4518 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
3a531937 JY |
4519 | Output_data_plt_aarch64_standard( |
4520 | Layout* layout, | |
4521 | Output_data_got_aarch64<size, big_endian>* got, | |
4522 | Output_data_space* got_plt, | |
4523 | Output_data_space* got_irelative) | |
053a4d68 | 4524 | : Output_data_plt_aarch64<size, big_endian>(layout, |
9363c7c3 | 4525 | size == 32 ? 4 : 8, |
3a531937 JY |
4526 | got, got_plt, |
4527 | got_irelative) | |
053a4d68 JY |
4528 | { } |
4529 | ||
4530 | protected: | |
4531 | // Return the offset of the first non-reserved PLT entry. | |
4532 | virtual unsigned int | |
4533 | do_first_plt_entry_offset() const | |
4534 | { return this->first_plt_entry_size; } | |
4535 | ||
4536 | // Return the size of a PLT entry | |
4537 | virtual unsigned int | |
4538 | do_get_plt_entry_size() const | |
4539 | { return this->plt_entry_size; } | |
4540 | ||
3a531937 JY |
4541 | // Return the size of a tlsdesc entry |
4542 | virtual unsigned int | |
4543 | do_get_plt_tlsdesc_entry_size() const | |
4544 | { return this->plt_tlsdesc_entry_size; } | |
4545 | ||
053a4d68 JY |
4546 | virtual void |
4547 | do_fill_first_plt_entry(unsigned char* pov, | |
9363c7c3 JY |
4548 | Address got_address, |
4549 | Address plt_address); | |
053a4d68 JY |
4550 | |
4551 | virtual void | |
4552 | do_fill_plt_entry(unsigned char* pov, | |
9363c7c3 JY |
4553 | Address got_address, |
4554 | Address plt_address, | |
4555 | unsigned int got_offset, | |
4556 | unsigned int plt_offset); | |
053a4d68 | 4557 | |
3a531937 JY |
4558 | virtual void |
4559 | do_fill_tlsdesc_entry(unsigned char* pov, | |
4560 | Address gotplt_address, | |
4561 | Address plt_address, | |
4562 | Address got_base, | |
4563 | unsigned int tlsdesc_got_offset, | |
4564 | unsigned int plt_offset); | |
4565 | ||
053a4d68 JY |
4566 | private: |
4567 | // The size of the first plt entry size. | |
4568 | static const int first_plt_entry_size = 32; | |
4569 | // The size of the plt entry size. | |
4570 | static const int plt_entry_size = 16; | |
3a531937 JY |
4571 | // The size of the plt tlsdesc entry size. |
4572 | static const int plt_tlsdesc_entry_size = 32; | |
053a4d68 JY |
4573 | // Template for the first PLT entry. |
4574 | static const uint32_t first_plt_entry[first_plt_entry_size / 4]; | |
4575 | // Template for subsequent PLT entries. | |
4576 | static const uint32_t plt_entry[plt_entry_size / 4]; | |
3a531937 JY |
4577 | // The reserved TLSDESC entry in the PLT for an executable. |
4578 | static const uint32_t tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4]; | |
053a4d68 JY |
4579 | }; |
4580 | ||
4581 | // The first entry in the PLT for an executable. | |
4582 | ||
4583 | template<> | |
4584 | const uint32_t | |
4585 | Output_data_plt_aarch64_standard<32, false>:: | |
4586 | first_plt_entry[first_plt_entry_size / 4] = | |
4587 | { | |
4588 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ | |
4589 | 0x90000010, /* adrp x16, PLT_GOT+0x8 */ | |
4590 | 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */ | |
4591 | 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */ | |
4592 | 0xd61f0220, /* br x17 */ | |
4593 | 0xd503201f, /* nop */ | |
4594 | 0xd503201f, /* nop */ | |
4595 | 0xd503201f, /* nop */ | |
4596 | }; | |
4597 | ||
83a01957 | 4598 | |
053a4d68 JY |
4599 | template<> |
4600 | const uint32_t | |
4601 | Output_data_plt_aarch64_standard<32, true>:: | |
4602 | first_plt_entry[first_plt_entry_size / 4] = | |
4603 | { | |
4604 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ | |
4605 | 0x90000010, /* adrp x16, PLT_GOT+0x8 */ | |
4606 | 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */ | |
4607 | 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */ | |
4608 | 0xd61f0220, /* br x17 */ | |
4609 | 0xd503201f, /* nop */ | |
4610 | 0xd503201f, /* nop */ | |
4611 | 0xd503201f, /* nop */ | |
4612 | }; | |
4613 | ||
83a01957 | 4614 | |
053a4d68 JY |
4615 | template<> |
4616 | const uint32_t | |
4617 | Output_data_plt_aarch64_standard<64, false>:: | |
4618 | first_plt_entry[first_plt_entry_size / 4] = | |
4619 | { | |
4620 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ | |
4621 | 0x90000010, /* adrp x16, PLT_GOT+16 */ | |
4622 | 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */ | |
4623 | 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */ | |
4624 | 0xd61f0220, /* br x17 */ | |
4625 | 0xd503201f, /* nop */ | |
4626 | 0xd503201f, /* nop */ | |
4627 | 0xd503201f, /* nop */ | |
4628 | }; | |
4629 | ||
83a01957 | 4630 | |
053a4d68 JY |
4631 | template<> |
4632 | const uint32_t | |
4633 | Output_data_plt_aarch64_standard<64, true>:: | |
4634 | first_plt_entry[first_plt_entry_size / 4] = | |
4635 | { | |
4636 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ | |
4637 | 0x90000010, /* adrp x16, PLT_GOT+16 */ | |
4638 | 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */ | |
4639 | 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */ | |
4640 | 0xd61f0220, /* br x17 */ | |
4641 | 0xd503201f, /* nop */ | |
4642 | 0xd503201f, /* nop */ | |
4643 | 0xd503201f, /* nop */ | |
4644 | }; | |
4645 | ||
83a01957 | 4646 | |
053a4d68 JY |
4647 | template<> |
4648 | const uint32_t | |
4649 | Output_data_plt_aarch64_standard<32, false>:: | |
4650 | plt_entry[plt_entry_size / 4] = | |
4651 | { | |
4652 | 0x90000010, /* adrp x16, PLTGOT + n * 4 */ | |
4653 | 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */ | |
4654 | 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */ | |
4655 | 0xd61f0220, /* br x17. */ | |
4656 | }; | |
4657 | ||
83a01957 | 4658 | |
053a4d68 JY |
4659 | template<> |
4660 | const uint32_t | |
4661 | Output_data_plt_aarch64_standard<32, true>:: | |
4662 | plt_entry[plt_entry_size / 4] = | |
4663 | { | |
4664 | 0x90000010, /* adrp x16, PLTGOT + n * 4 */ | |
4665 | 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */ | |
4666 | 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */ | |
4667 | 0xd61f0220, /* br x17. */ | |
4668 | }; | |
4669 | ||
83a01957 | 4670 | |
053a4d68 JY |
4671 | template<> |
4672 | const uint32_t | |
4673 | Output_data_plt_aarch64_standard<64, false>:: | |
4674 | plt_entry[plt_entry_size / 4] = | |
4675 | { | |
4676 | 0x90000010, /* adrp x16, PLTGOT + n * 8 */ | |
4677 | 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */ | |
4678 | 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */ | |
4679 | 0xd61f0220, /* br x17. */ | |
4680 | }; | |
4681 | ||
83a01957 | 4682 | |
053a4d68 JY |
4683 | template<> |
4684 | const uint32_t | |
4685 | Output_data_plt_aarch64_standard<64, true>:: | |
4686 | plt_entry[plt_entry_size / 4] = | |
4687 | { | |
4688 | 0x90000010, /* adrp x16, PLTGOT + n * 8 */ | |
4689 | 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */ | |
4690 | 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */ | |
4691 | 0xd61f0220, /* br x17. */ | |
4692 | }; | |
4693 | ||
83a01957 | 4694 | |
053a4d68 JY |
4695 | template<int size, bool big_endian> |
4696 | void | |
4697 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_first_plt_entry( | |
4698 | unsigned char* pov, | |
9363c7c3 JY |
4699 | Address got_address, |
4700 | Address plt_address) | |
053a4d68 JY |
4701 | { |
4702 | // PLT0 of the small PLT looks like this in ELF64 - | |
4703 | // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack. | |
4704 | // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT | |
4705 | // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the | |
4706 | // symbol resolver | |
4707 | // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the | |
4708 | // GOTPLT entry for this. | |
4709 | // br x17 | |
4710 | // PLT0 will be slightly different in ELF32 due to different got entry | |
4711 | // size. | |
4712 | memcpy(pov, this->first_plt_entry, this->first_plt_entry_size); | |
9363c7c3 JY |
4713 | Address gotplt_2nd_ent = got_address + (size / 8) * 2; |
4714 | ||
4715 | // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2. | |
4716 | // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff. | |
4717 | // FIXME: This only works for 64bit | |
4718 | AArch64_relocate_functions<size, big_endian>::adrp(pov + 4, | |
4719 | gotplt_2nd_ent, plt_address + 4); | |
4720 | ||
4721 | // Fill in R_AARCH64_LDST8_LO12 | |
4722 | elfcpp::Swap<32, big_endian>::writeval( | |
4723 | pov + 8, | |
4724 | ((this->first_plt_entry[2] & 0xffc003ff) | |
4725 | | ((gotplt_2nd_ent & 0xff8) << 7))); | |
4726 | ||
4727 | // Fill in R_AARCH64_ADD_ABS_LO12 | |
4728 | elfcpp::Swap<32, big_endian>::writeval( | |
4729 | pov + 12, | |
4730 | ((this->first_plt_entry[3] & 0xffc003ff) | |
4731 | | ((gotplt_2nd_ent & 0xfff) << 10))); | |
053a4d68 JY |
4732 | } |
4733 | ||
83a01957 | 4734 | |
053a4d68 | 4735 | // Subsequent entries in the PLT for an executable. |
9363c7c3 | 4736 | // FIXME: This only works for 64bit |
053a4d68 JY |
4737 | |
4738 | template<int size, bool big_endian> | |
4739 | void | |
4740 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_plt_entry( | |
4741 | unsigned char* pov, | |
9363c7c3 JY |
4742 | Address got_address, |
4743 | Address plt_address, | |
4744 | unsigned int got_offset, | |
4745 | unsigned int plt_offset) | |
053a4d68 JY |
4746 | { |
4747 | memcpy(pov, this->plt_entry, this->plt_entry_size); | |
9363c7c3 JY |
4748 | |
4749 | Address gotplt_entry_address = got_address + got_offset; | |
4750 | Address plt_entry_address = plt_address + plt_offset; | |
4751 | ||
4752 | // Fill in R_AARCH64_PCREL_ADR_HI21 | |
4753 | AArch64_relocate_functions<size, big_endian>::adrp( | |
4754 | pov, | |
4755 | gotplt_entry_address, | |
4756 | plt_entry_address); | |
4757 | ||
4758 | // Fill in R_AARCH64_LDST64_ABS_LO12 | |
4759 | elfcpp::Swap<32, big_endian>::writeval( | |
4760 | pov + 4, | |
4761 | ((this->plt_entry[1] & 0xffc003ff) | |
4762 | | ((gotplt_entry_address & 0xff8) << 7))); | |
4763 | ||
4764 | // Fill in R_AARCH64_ADD_ABS_LO12 | |
4765 | elfcpp::Swap<32, big_endian>::writeval( | |
4766 | pov + 8, | |
4767 | ((this->plt_entry[2] & 0xffc003ff) | |
4768 | | ((gotplt_entry_address & 0xfff) <<10))); | |
4769 | ||
053a4d68 JY |
4770 | } |
4771 | ||
3a531937 JY |
4772 | |
4773 | template<> | |
4774 | const uint32_t | |
4775 | Output_data_plt_aarch64_standard<32, false>:: | |
4776 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = | |
4777 | { | |
4778 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ | |
4779 | 0x90000002, /* adrp x2, 0 */ | |
4780 | 0x90000003, /* adrp x3, 0 */ | |
4781 | 0xb9400042, /* ldr w2, [w2, #0] */ | |
4782 | 0x11000063, /* add w3, w3, 0 */ | |
4783 | 0xd61f0040, /* br x2 */ | |
4784 | 0xd503201f, /* nop */ | |
4785 | 0xd503201f, /* nop */ | |
4786 | }; | |
4787 | ||
4788 | template<> | |
4789 | const uint32_t | |
4790 | Output_data_plt_aarch64_standard<32, true>:: | |
4791 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = | |
4792 | { | |
4793 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ | |
4794 | 0x90000002, /* adrp x2, 0 */ | |
4795 | 0x90000003, /* adrp x3, 0 */ | |
4796 | 0xb9400042, /* ldr w2, [w2, #0] */ | |
4797 | 0x11000063, /* add w3, w3, 0 */ | |
4798 | 0xd61f0040, /* br x2 */ | |
4799 | 0xd503201f, /* nop */ | |
4800 | 0xd503201f, /* nop */ | |
4801 | }; | |
4802 | ||
4803 | template<> | |
4804 | const uint32_t | |
4805 | Output_data_plt_aarch64_standard<64, false>:: | |
4806 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = | |
4807 | { | |
4808 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ | |
4809 | 0x90000002, /* adrp x2, 0 */ | |
4810 | 0x90000003, /* adrp x3, 0 */ | |
4811 | 0xf9400042, /* ldr x2, [x2, #0] */ | |
4812 | 0x91000063, /* add x3, x3, 0 */ | |
4813 | 0xd61f0040, /* br x2 */ | |
4814 | 0xd503201f, /* nop */ | |
4815 | 0xd503201f, /* nop */ | |
4816 | }; | |
4817 | ||
4818 | template<> | |
4819 | const uint32_t | |
4820 | Output_data_plt_aarch64_standard<64, true>:: | |
4821 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = | |
4822 | { | |
4823 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ | |
4824 | 0x90000002, /* adrp x2, 0 */ | |
4825 | 0x90000003, /* adrp x3, 0 */ | |
4826 | 0xf9400042, /* ldr x2, [x2, #0] */ | |
4827 | 0x91000063, /* add x3, x3, 0 */ | |
4828 | 0xd61f0040, /* br x2 */ | |
4829 | 0xd503201f, /* nop */ | |
4830 | 0xd503201f, /* nop */ | |
4831 | }; | |
4832 | ||
4833 | template<int size, bool big_endian> | |
4834 | void | |
4835 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_tlsdesc_entry( | |
4836 | unsigned char* pov, | |
4837 | Address gotplt_address, | |
4838 | Address plt_address, | |
4839 | Address got_base, | |
4840 | unsigned int tlsdesc_got_offset, | |
4841 | unsigned int plt_offset) | |
4842 | { | |
4843 | memcpy(pov, tlsdesc_plt_entry, plt_tlsdesc_entry_size); | |
4844 | ||
4845 | // move DT_TLSDESC_GOT address into x2 | |
4846 | // move .got.plt address into x3 | |
4847 | Address tlsdesc_got_entry = got_base + tlsdesc_got_offset; | |
4848 | Address plt_entry_address = plt_address + plt_offset; | |
4849 | ||
4850 | // R_AARCH64_ADR_PREL_PG_HI21 | |
4851 | AArch64_relocate_functions<size, big_endian>::adrp( | |
4852 | pov + 4, | |
4853 | tlsdesc_got_entry, | |
4854 | plt_entry_address + 4); | |
4855 | ||
4856 | // R_AARCH64_ADR_PREL_PG_HI21 | |
4857 | AArch64_relocate_functions<size, big_endian>::adrp( | |
4858 | pov + 8, | |
4859 | gotplt_address, | |
4860 | plt_entry_address + 8); | |
4861 | ||
4862 | // R_AARCH64_LDST64_ABS_LO12 | |
4863 | elfcpp::Swap<32, big_endian>::writeval( | |
4864 | pov + 12, | |
4865 | ((this->tlsdesc_plt_entry[3] & 0xffc003ff) | |
4866 | | ((tlsdesc_got_entry & 0xff8) << 7))); | |
4867 | ||
4868 | // R_AARCH64_ADD_ABS_LO12 | |
4869 | elfcpp::Swap<32, big_endian>::writeval( | |
4870 | pov + 16, | |
4871 | ((this->tlsdesc_plt_entry[4] & 0xffc003ff) | |
4872 | | ((gotplt_address & 0xfff) << 10))); | |
4873 | } | |
4874 | ||
053a4d68 JY |
4875 | // Write out the PLT. This uses the hand-coded instructions above, |
4876 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
4877 | ||
4878 | template<int size, bool big_endian> | |
4879 | void | |
4880 | Output_data_plt_aarch64<size, big_endian>::do_write(Output_file* of) | |
4881 | { | |
4882 | const off_t offset = this->offset(); | |
4883 | const section_size_type oview_size = | |
4884 | convert_to_section_size_type(this->data_size()); | |
4885 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
4886 | ||
4887 | const off_t got_file_offset = this->got_plt_->offset(); | |
9726c3c1 HS |
4888 | gold_assert(got_file_offset + this->got_plt_->data_size() |
4889 | == this->got_irelative_->offset()); | |
4890 | ||
053a4d68 | 4891 | const section_size_type got_size = |
9726c3c1 HS |
4892 | convert_to_section_size_type(this->got_plt_->data_size() |
4893 | + this->got_irelative_->data_size()); | |
053a4d68 JY |
4894 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
4895 | got_size); | |
4896 | ||
4897 | unsigned char* pov = oview; | |
4898 | ||
4899 | // The base address of the .plt section. | |
4900 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); | |
053a4d68 | 4901 | // The base address of the PLT portion of the .got section. |
3a531937 JY |
4902 | typename elfcpp::Elf_types<size>::Elf_Addr gotplt_address |
4903 | = this->got_plt_->address(); | |
053a4d68 | 4904 | |
3a531937 | 4905 | this->fill_first_plt_entry(pov, gotplt_address, plt_address); |
053a4d68 JY |
4906 | pov += this->first_plt_entry_offset(); |
4907 | ||
4908 | // The first three entries in .got.plt are reserved. | |
4909 | unsigned char* got_pov = got_view; | |
4910 | memset(got_pov, 0, size / 8 * AARCH64_GOTPLT_RESERVE_COUNT); | |
4911 | got_pov += (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT; | |
4912 | ||
4913 | unsigned int plt_offset = this->first_plt_entry_offset(); | |
4914 | unsigned int got_offset = (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT; | |
3a531937 | 4915 | const unsigned int count = this->count_ + this->irelative_count_; |
053a4d68 JY |
4916 | for (unsigned int plt_index = 0; |
4917 | plt_index < count; | |
4918 | ++plt_index, | |
4919 | pov += this->get_plt_entry_size(), | |
4920 | got_pov += size / 8, | |
4921 | plt_offset += this->get_plt_entry_size(), | |
4922 | got_offset += size / 8) | |
4923 | { | |
4924 | // Set and adjust the PLT entry itself. | |
3a531937 | 4925 | this->fill_plt_entry(pov, gotplt_address, plt_address, |
9363c7c3 | 4926 | got_offset, plt_offset); |
053a4d68 | 4927 | |
9363c7c3 JY |
4928 | // Set the entry in the GOT, which points to plt0. |
4929 | elfcpp::Swap<size, big_endian>::writeval(got_pov, plt_address); | |
053a4d68 JY |
4930 | } |
4931 | ||
3a531937 JY |
4932 | if (this->has_tlsdesc_entry()) |
4933 | { | |
4934 | // Set and adjust the reserved TLSDESC PLT entry. | |
4935 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
4936 | // The base address of the .base section. | |
4937 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = | |
4938 | this->got_->address(); | |
4939 | this->fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base, | |
4940 | tlsdesc_got_offset, plt_offset); | |
4941 | pov += this->get_plt_tlsdesc_entry_size(); | |
4942 | } | |
4943 | ||
053a4d68 JY |
4944 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
4945 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
4946 | ||
4947 | of->write_output_view(offset, oview_size, oview); | |
4948 | of->write_output_view(got_file_offset, got_size, got_view); | |
4949 | } | |
4950 | ||
9363c7c3 JY |
4951 | // Telling how to update the immediate field of an instruction. |
4952 | struct AArch64_howto | |
4953 | { | |
4954 | // The immediate field mask. | |
4955 | elfcpp::Elf_Xword dst_mask; | |
4956 | ||
4957 | // The offset to apply relocation immediate | |
4958 | int doffset; | |
4959 | ||
4960 | // The second part offset, if the immediate field has two parts. | |
4961 | // -1 if the immediate field has only one part. | |
4962 | int doffset2; | |
4963 | }; | |
4964 | ||
4965 | static const AArch64_howto aarch64_howto[AArch64_reloc_property::INST_NUM] = | |
4966 | { | |
4967 | {0, -1, -1}, // DATA | |
4968 | {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16 | |
4969 | {0xffffe0, 5, -1}, // LD [23:5]-imm19 | |
4970 | {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi | |
4971 | {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi | |
4972 | {0x3ffc00, 10, -1}, // ADD [21:10]-imm12 | |
4973 | {0x3ffc00, 10, -1}, // LDST [21:10]-imm12 | |
4974 | {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14 | |
4975 | {0xffffe0, 5, -1}, // CONDB [23:5]-imm19 | |
4976 | {0x3ffffff, 0, -1}, // B [25:0]-imm26 | |
4977 | {0x3ffffff, 0, -1}, // CALL [25:0]-imm26 | |
4978 | }; | |
4979 | ||
4980 | // AArch64 relocate function class | |
4981 | ||
4982 | template<int size, bool big_endian> | |
4983 | class AArch64_relocate_functions | |
4984 | { | |
4985 | public: | |
4986 | typedef enum | |
4987 | { | |
4988 | STATUS_OKAY, // No error during relocation. | |
4989 | STATUS_OVERFLOW, // Relocation overflow. | |
4990 | STATUS_BAD_RELOC, // Relocation cannot be applied. | |
4991 | } Status; | |
4992 | ||
9363c7c3 JY |
4993 | typedef AArch64_relocate_functions<size, big_endian> This; |
4994 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
83a01957 HS |
4995 | typedef Relocate_info<size, big_endian> The_relocate_info; |
4996 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; | |
4997 | typedef Reloc_stub<size, big_endian> The_reloc_stub; | |
83a01957 HS |
4998 | typedef Stub_table<size, big_endian> The_stub_table; |
4999 | typedef elfcpp::Rela<size, big_endian> The_rela; | |
9726c3c1 | 5000 | typedef typename elfcpp::Swap<size, big_endian>::Valtype AArch64_valtype; |
9363c7c3 JY |
5001 | |
5002 | // Return the page address of the address. | |
5003 | // Page(address) = address & ~0xFFF | |
5004 | ||
9726c3c1 | 5005 | static inline AArch64_valtype |
9363c7c3 JY |
5006 | Page(Address address) |
5007 | { | |
5008 | return (address & (~static_cast<Address>(0xFFF))); | |
5009 | } | |
5010 | ||
83a01957 | 5011 | private: |
9363c7c3 JY |
5012 | // Update instruction (pointed by view) with selected bits (immed). |
5013 | // val = (val & ~dst_mask) | (immed << doffset) | |
5014 | ||
5015 | template<int valsize> | |
5016 | static inline void | |
5017 | update_view(unsigned char* view, | |
9726c3c1 | 5018 | AArch64_valtype immed, |
9363c7c3 JY |
5019 | elfcpp::Elf_Xword doffset, |
5020 | elfcpp::Elf_Xword dst_mask) | |
5021 | { | |
5022 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
5023 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
5024 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
5025 | ||
5026 | // Clear immediate fields. | |
5027 | val &= ~dst_mask; | |
5028 | elfcpp::Swap<valsize, big_endian>::writeval(wv, | |
5029 | static_cast<Valtype>(val | (immed << doffset))); | |
5030 | } | |
5031 | ||
5032 | // Update two parts of an instruction (pointed by view) with selected | |
5033 | // bits (immed1 and immed2). | |
5034 | // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2) | |
5035 | ||
5036 | template<int valsize> | |
5037 | static inline void | |
5038 | update_view_two_parts( | |
5039 | unsigned char* view, | |
9726c3c1 HS |
5040 | AArch64_valtype immed1, |
5041 | AArch64_valtype immed2, | |
9363c7c3 JY |
5042 | elfcpp::Elf_Xword doffset1, |
5043 | elfcpp::Elf_Xword doffset2, | |
5044 | elfcpp::Elf_Xword dst_mask) | |
5045 | { | |
5046 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
5047 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
5048 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
5049 | val &= ~dst_mask; | |
5050 | elfcpp::Swap<valsize, big_endian>::writeval(wv, | |
5051 | static_cast<Valtype>(val | (immed1 << doffset1) | | |
5052 | (immed2 << doffset2))); | |
5053 | } | |
5054 | ||
9726c3c1 | 5055 | // Update adr or adrp instruction with immed. |
9363c7c3 JY |
5056 | // In adr and adrp: [30:29] immlo [23:5] immhi |
5057 | ||
5058 | static inline void | |
9726c3c1 | 5059 | update_adr(unsigned char* view, AArch64_valtype immed) |
9363c7c3 JY |
5060 | { |
5061 | elfcpp::Elf_Xword dst_mask = (0x3 << 29) | (0x7ffff << 5); | |
9363c7c3 JY |
5062 | This::template update_view_two_parts<32>( |
5063 | view, | |
5064 | immed & 0x3, | |
5065 | (immed & 0x1ffffc) >> 2, | |
5066 | 29, | |
5067 | 5, | |
5068 | dst_mask); | |
5069 | } | |
5070 | ||
3a531937 JY |
5071 | // Update movz/movn instruction with bits immed. |
5072 | // Set instruction to movz if is_movz is true, otherwise set instruction | |
5073 | // to movn. | |
9726c3c1 | 5074 | |
3a531937 JY |
5075 | static inline void |
5076 | update_movnz(unsigned char* view, | |
9726c3c1 | 5077 | AArch64_valtype immed, |
3a531937 JY |
5078 | bool is_movz) |
5079 | { | |
5080 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
5081 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
5082 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
5083 | ||
5084 | const elfcpp::Elf_Xword doffset = | |
5085 | aarch64_howto[AArch64_reloc_property::INST_MOVW].doffset; | |
5086 | const elfcpp::Elf_Xword dst_mask = | |
5087 | aarch64_howto[AArch64_reloc_property::INST_MOVW].dst_mask; | |
5088 | ||
5089 | // Clear immediate fields and opc code. | |
9726c3c1 | 5090 | val &= ~(dst_mask | (0x3 << 29)); |
3a531937 JY |
5091 | |
5092 | // Set instruction to movz or movn. | |
5093 | // movz: [30:29] is 10 movn: [30:29] is 00 | |
5094 | if (is_movz) | |
9726c3c1 | 5095 | val |= (0x2 << 29); |
3a531937 JY |
5096 | |
5097 | elfcpp::Swap<32, big_endian>::writeval(wv, | |
5098 | static_cast<Valtype>(val | (immed << doffset))); | |
5099 | } | |
5100 | ||
9726c3c1 HS |
5101 | // Update selected bits in text. |
5102 | ||
5103 | template<int valsize> | |
5104 | static inline typename This::Status | |
5105 | reloc_common(unsigned char* view, Address x, | |
5106 | const AArch64_reloc_property* reloc_property) | |
5107 | { | |
5108 | // Select bits from X. | |
5109 | Address immed = reloc_property->select_x_value(x); | |
5110 | ||
5111 | // Update view. | |
5112 | const AArch64_reloc_property::Reloc_inst inst = | |
5113 | reloc_property->reloc_inst(); | |
5114 | // If it is a data relocation or instruction has 2 parts of immediate | |
5115 | // fields, you should not call pcrela_general. | |
5116 | gold_assert(aarch64_howto[inst].doffset2 == -1 && | |
5117 | aarch64_howto[inst].doffset != -1); | |
5118 | This::template update_view<valsize>(view, immed, | |
5119 | aarch64_howto[inst].doffset, | |
5120 | aarch64_howto[inst].dst_mask); | |
5121 | ||
5122 | // Do check overflow or alignment if needed. | |
5123 | return (reloc_property->checkup_x_value(x) | |
5124 | ? This::STATUS_OKAY | |
5125 | : This::STATUS_OVERFLOW); | |
5126 | } | |
5127 | ||
9363c7c3 JY |
5128 | public: |
5129 | ||
a48d0c12 HS |
5130 | // Construct a B insn. Note, although we group it here with other relocation |
5131 | // operation, there is actually no 'relocation' involved here. | |
5132 | static inline void | |
5133 | construct_b(unsigned char* view, unsigned int branch_offset) | |
5134 | { | |
5135 | update_view_two_parts<32>(view, 0x05, (branch_offset >> 2), | |
5136 | 26, 0, 0xffffffff); | |
5137 | } | |
5138 | ||
9363c7c3 JY |
5139 | // Do a simple rela relocation at unaligned addresses. |
5140 | ||
5141 | template<int valsize> | |
5142 | static inline typename This::Status | |
5143 | rela_ua(unsigned char* view, | |
5144 | const Sized_relobj_file<size, big_endian>* object, | |
5145 | const Symbol_value<size>* psymval, | |
9726c3c1 | 5146 | AArch64_valtype addend, |
9363c7c3 JY |
5147 | const AArch64_reloc_property* reloc_property) |
5148 | { | |
5149 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype | |
5150 | Valtype; | |
5151 | typename elfcpp::Elf_types<size>::Elf_Addr x = | |
5152 | psymval->value(object, addend); | |
5153 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, | |
5154 | static_cast<Valtype>(x)); | |
5155 | return (reloc_property->checkup_x_value(x) | |
5156 | ? This::STATUS_OKAY | |
5157 | : This::STATUS_OVERFLOW); | |
5158 | } | |
5159 | ||
5160 | // Do a simple pc-relative relocation at unaligned addresses. | |
5161 | ||
5162 | template<int valsize> | |
5163 | static inline typename This::Status | |
5164 | pcrela_ua(unsigned char* view, | |
5165 | const Sized_relobj_file<size, big_endian>* object, | |
5166 | const Symbol_value<size>* psymval, | |
9726c3c1 | 5167 | AArch64_valtype addend, |
9363c7c3 JY |
5168 | Address address, |
5169 | const AArch64_reloc_property* reloc_property) | |
5170 | { | |
5171 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype | |
5172 | Valtype; | |
3a531937 | 5173 | Address x = psymval->value(object, addend) - address; |
9363c7c3 JY |
5174 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, |
5175 | static_cast<Valtype>(x)); | |
5176 | return (reloc_property->checkup_x_value(x) | |
5177 | ? This::STATUS_OKAY | |
5178 | : This::STATUS_OVERFLOW); | |
5179 | } | |
5180 | ||
5181 | // Do a simple rela relocation at aligned addresses. | |
5182 | ||
5183 | template<int valsize> | |
5184 | static inline typename This::Status | |
5185 | rela( | |
5186 | unsigned char* view, | |
5187 | const Sized_relobj_file<size, big_endian>* object, | |
5188 | const Symbol_value<size>* psymval, | |
9726c3c1 | 5189 | AArch64_valtype addend, |
9363c7c3 JY |
5190 | const AArch64_reloc_property* reloc_property) |
5191 | { | |
9726c3c1 | 5192 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
9363c7c3 | 5193 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
3a531937 | 5194 | Address x = psymval->value(object, addend); |
9726c3c1 | 5195 | elfcpp::Swap<valsize, big_endian>::writeval(wv,static_cast<Valtype>(x)); |
9363c7c3 JY |
5196 | return (reloc_property->checkup_x_value(x) |
5197 | ? This::STATUS_OKAY | |
5198 | : This::STATUS_OVERFLOW); | |
5199 | } | |
5200 | ||
5201 | // Do relocate. Update selected bits in text. | |
5202 | // new_val = (val & ~dst_mask) | (immed << doffset) | |
5203 | ||
5204 | template<int valsize> | |
5205 | static inline typename This::Status | |
5206 | rela_general(unsigned char* view, | |
5207 | const Sized_relobj_file<size, big_endian>* object, | |
5208 | const Symbol_value<size>* psymval, | |
9726c3c1 | 5209 | AArch64_valtype addend, |
9363c7c3 JY |
5210 | const AArch64_reloc_property* reloc_property) |
5211 | { | |
5212 | // Calculate relocation. | |
83a01957 | 5213 | Address x = psymval->value(object, addend); |
9726c3c1 | 5214 | return This::template reloc_common<valsize>(view, x, reloc_property); |
9363c7c3 JY |
5215 | } |
5216 | ||
5217 | // Do relocate. Update selected bits in text. | |
5218 | // new val = (val & ~dst_mask) | (immed << doffset) | |
5219 | ||
5220 | template<int valsize> | |
5221 | static inline typename This::Status | |
5222 | rela_general( | |
5223 | unsigned char* view, | |
9726c3c1 HS |
5224 | AArch64_valtype s, |
5225 | AArch64_valtype addend, | |
9363c7c3 JY |
5226 | const AArch64_reloc_property* reloc_property) |
5227 | { | |
5228 | // Calculate relocation. | |
5229 | Address x = s + addend; | |
9726c3c1 | 5230 | return This::template reloc_common<valsize>(view, x, reloc_property); |
9363c7c3 JY |
5231 | } |
5232 | ||
5233 | // Do address relative relocate. Update selected bits in text. | |
5234 | // new val = (val & ~dst_mask) | (immed << doffset) | |
5235 | ||
5236 | template<int valsize> | |
5237 | static inline typename This::Status | |
5238 | pcrela_general( | |
5239 | unsigned char* view, | |
5240 | const Sized_relobj_file<size, big_endian>* object, | |
5241 | const Symbol_value<size>* psymval, | |
9726c3c1 | 5242 | AArch64_valtype addend, |
9363c7c3 JY |
5243 | Address address, |
5244 | const AArch64_reloc_property* reloc_property) | |
5245 | { | |
5246 | // Calculate relocation. | |
3a531937 | 5247 | Address x = psymval->value(object, addend) - address; |
9726c3c1 HS |
5248 | return This::template reloc_common<valsize>(view, x, reloc_property); |
5249 | } | |
9363c7c3 | 5250 | |
9363c7c3 | 5251 | |
9726c3c1 | 5252 | // Calculate (S + A) - address, update adr instruction. |
9363c7c3 | 5253 | |
9726c3c1 HS |
5254 | static inline typename This::Status |
5255 | adr(unsigned char* view, | |
5256 | const Sized_relobj_file<size, big_endian>* object, | |
5257 | const Symbol_value<size>* psymval, | |
5258 | Address addend, | |
5259 | Address address, | |
5260 | const AArch64_reloc_property* /* reloc_property */) | |
5261 | { | |
5262 | AArch64_valtype x = psymval->value(object, addend) - address; | |
5263 | // Pick bits [20:0] of X. | |
5264 | AArch64_valtype immed = x & 0x1fffff; | |
5265 | update_adr(view, immed); | |
5266 | // Check -2^20 <= X < 2^20 | |
5267 | return (size == 64 && Bits<21>::has_overflow((x)) | |
5268 | ? This::STATUS_OVERFLOW | |
5269 | : This::STATUS_OKAY); | |
9363c7c3 JY |
5270 | } |
5271 | ||
5272 | // Calculate PG(S+A) - PG(address), update adrp instruction. | |
5273 | // R_AARCH64_ADR_PREL_PG_HI21 | |
5274 | ||
5275 | static inline typename This::Status | |
5276 | adrp( | |
5277 | unsigned char* view, | |
5278 | Address sa, | |
5279 | Address address) | |
5280 | { | |
9726c3c1 HS |
5281 | AArch64_valtype x = This::Page(sa) - This::Page(address); |
5282 | // Pick [32:12] of X. | |
5283 | AArch64_valtype immed = (x >> 12) & 0x1fffff; | |
5284 | update_adr(view, immed); | |
83a01957 HS |
5285 | // Check -2^32 <= X < 2^32 |
5286 | return (size == 64 && Bits<33>::has_overflow((x)) | |
9363c7c3 JY |
5287 | ? This::STATUS_OVERFLOW |
5288 | : This::STATUS_OKAY); | |
5289 | } | |
5290 | ||
5291 | // Calculate PG(S+A) - PG(address), update adrp instruction. | |
5292 | // R_AARCH64_ADR_PREL_PG_HI21 | |
5293 | ||
5294 | static inline typename This::Status | |
5295 | adrp(unsigned char* view, | |
5296 | const Sized_relobj_file<size, big_endian>* object, | |
5297 | const Symbol_value<size>* psymval, | |
5298 | Address addend, | |
5299 | Address address, | |
5300 | const AArch64_reloc_property* reloc_property) | |
5301 | { | |
5302 | Address sa = psymval->value(object, addend); | |
9726c3c1 HS |
5303 | AArch64_valtype x = This::Page(sa) - This::Page(address); |
5304 | // Pick [32:12] of X. | |
5305 | AArch64_valtype immed = (x >> 12) & 0x1fffff; | |
5306 | update_adr(view, immed); | |
9363c7c3 JY |
5307 | return (reloc_property->checkup_x_value(x) |
5308 | ? This::STATUS_OKAY | |
5309 | : This::STATUS_OVERFLOW); | |
5310 | } | |
5311 | ||
3a531937 JY |
5312 | // Update mov[n/z] instruction. Check overflow if needed. |
5313 | // If X >=0, set the instruction to movz and its immediate value to the | |
5314 | // selected bits S. | |
5315 | // If X < 0, set the instruction to movn and its immediate value to | |
5316 | // NOT (selected bits of). | |
5317 | ||
5318 | static inline typename This::Status | |
5319 | movnz(unsigned char* view, | |
9726c3c1 | 5320 | AArch64_valtype x, |
3a531937 JY |
5321 | const AArch64_reloc_property* reloc_property) |
5322 | { | |
5323 | // Select bits from X. | |
9726c3c1 HS |
5324 | Address immed; |
5325 | bool is_movz; | |
5326 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedW; | |
5327 | if (static_cast<SignedW>(x) >= 0) | |
5328 | { | |
5329 | immed = reloc_property->select_x_value(x); | |
5330 | is_movz = true; | |
5331 | } | |
5332 | else | |
3a531937 | 5333 | { |
9726c3c1 | 5334 | immed = reloc_property->select_x_value(~x);; |
3a531937 JY |
5335 | is_movz = false; |
5336 | } | |
5337 | ||
5338 | // Update movnz instruction. | |
5339 | update_movnz(view, immed, is_movz); | |
5340 | ||
5341 | // Do check overflow or alignment if needed. | |
5342 | return (reloc_property->checkup_x_value(x) | |
5343 | ? This::STATUS_OKAY | |
5344 | : This::STATUS_OVERFLOW); | |
5345 | } | |
5346 | ||
83a01957 HS |
5347 | static inline bool |
5348 | maybe_apply_stub(unsigned int, | |
5349 | const The_relocate_info*, | |
5350 | const The_rela&, | |
5351 | unsigned char*, | |
5352 | Address, | |
5353 | const Sized_symbol<size>*, | |
5354 | const Symbol_value<size>*, | |
0bf32ea9 JY |
5355 | const Sized_relobj_file<size, big_endian>*, |
5356 | section_size_type); | |
83a01957 | 5357 | |
3a531937 JY |
5358 | }; // End of AArch64_relocate_functions |
5359 | ||
5360 | ||
83a01957 HS |
5361 | // For a certain relocation type (usually jump/branch), test to see if the |
5362 | // destination needs a stub to fulfil. If so, re-route the destination of the | |
5363 | // original instruction to the stub, note, at this time, the stub has already | |
5364 | // been generated. | |
5365 | ||
5366 | template<int size, bool big_endian> | |
5367 | bool | |
5368 | AArch64_relocate_functions<size, big_endian>:: | |
5369 | maybe_apply_stub(unsigned int r_type, | |
5370 | const The_relocate_info* relinfo, | |
5371 | const The_rela& rela, | |
5372 | unsigned char* view, | |
5373 | Address address, | |
5374 | const Sized_symbol<size>* gsym, | |
5375 | const Symbol_value<size>* psymval, | |
0bf32ea9 JY |
5376 | const Sized_relobj_file<size, big_endian>* object, |
5377 | section_size_type current_group_size) | |
83a01957 HS |
5378 | { |
5379 | if (parameters->options().relocatable()) | |
5380 | return false; | |
5381 | ||
5382 | typename elfcpp::Elf_types<size>::Elf_Swxword addend = rela.get_r_addend(); | |
5383 | Address branch_target = psymval->value(object, 0) + addend; | |
a48d0c12 HS |
5384 | int stub_type = |
5385 | The_reloc_stub::stub_type_for_reloc(r_type, address, branch_target); | |
5386 | if (stub_type == ST_NONE) | |
83a01957 HS |
5387 | return false; |
5388 | ||
5389 | const The_aarch64_relobj* aarch64_relobj = | |
5390 | static_cast<const The_aarch64_relobj*>(object); | |
5391 | The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx); | |
5392 | gold_assert(stub_table != NULL); | |
5393 | ||
5394 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
5395 | typename The_reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend); | |
5396 | The_reloc_stub* stub = stub_table->find_reloc_stub(stub_key); | |
5397 | gold_assert(stub != NULL); | |
5398 | ||
5399 | Address new_branch_target = stub_table->address() + stub->offset(); | |
5400 | typename elfcpp::Swap<size, big_endian>::Valtype branch_offset = | |
5401 | new_branch_target - address; | |
5402 | const AArch64_reloc_property* arp = | |
5403 | aarch64_reloc_property_table->get_reloc_property(r_type); | |
5404 | gold_assert(arp != NULL); | |
aed56ec5 | 5405 | typename This::Status status = This::template |
83a01957 HS |
5406 | rela_general<32>(view, branch_offset, 0, arp); |
5407 | if (status != This::STATUS_OKAY) | |
5408 | gold_error(_("Stub is too far away, try a smaller value " | |
0bf32ea9 | 5409 | "for '--stub-group-size'. The current value is 0x%lx."), |
add6016b | 5410 | static_cast<unsigned long>(current_group_size)); |
83a01957 HS |
5411 | return true; |
5412 | } | |
5413 | ||
5414 | ||
5415 | // Group input sections for stub generation. | |
5416 | // | |
5417 | // We group input sections in an output section so that the total size, | |
5418 | // including any padding space due to alignment is smaller than GROUP_SIZE | |
5419 | // unless the only input section in group is bigger than GROUP_SIZE already. | |
5420 | // Then an ARM stub table is created to follow the last input section | |
5421 | // in group. For each group an ARM stub table is created an is placed | |
5422 | // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further | |
5423 | // extend the group after the stub table. | |
5424 | ||
5425 | template<int size, bool big_endian> | |
5426 | void | |
5427 | Target_aarch64<size, big_endian>::group_sections( | |
5428 | Layout* layout, | |
5429 | section_size_type group_size, | |
5430 | bool stubs_always_after_branch, | |
5431 | const Task* task) | |
5432 | { | |
5433 | // Group input sections and insert stub table | |
5434 | Layout::Section_list section_list; | |
5435 | layout->get_executable_sections(§ion_list); | |
5436 | for (Layout::Section_list::const_iterator p = section_list.begin(); | |
5437 | p != section_list.end(); | |
5438 | ++p) | |
5439 | { | |
5440 | AArch64_output_section<size, big_endian>* output_section = | |
5441 | static_cast<AArch64_output_section<size, big_endian>*>(*p); | |
5442 | output_section->group_sections(group_size, stubs_always_after_branch, | |
5443 | this, task); | |
5444 | } | |
5445 | } | |
5446 | ||
5447 | ||
5448 | // Find the AArch64_input_section object corresponding to the SHNDX-th input | |
5449 | // section of RELOBJ. | |
5450 | ||
5451 | template<int size, bool big_endian> | |
5452 | AArch64_input_section<size, big_endian>* | |
5453 | Target_aarch64<size, big_endian>::find_aarch64_input_section( | |
5454 | Relobj* relobj, unsigned int shndx) const | |
5455 | { | |
5456 | Section_id sid(relobj, shndx); | |
5457 | typename AArch64_input_section_map::const_iterator p = | |
5458 | this->aarch64_input_section_map_.find(sid); | |
5459 | return (p != this->aarch64_input_section_map_.end()) ? p->second : NULL; | |
5460 | } | |
5461 | ||
5462 | ||
5463 | // Make a new AArch64_input_section object. | |
5464 | ||
5465 | template<int size, bool big_endian> | |
5466 | AArch64_input_section<size, big_endian>* | |
5467 | Target_aarch64<size, big_endian>::new_aarch64_input_section( | |
5468 | Relobj* relobj, unsigned int shndx) | |
5469 | { | |
5470 | Section_id sid(relobj, shndx); | |
5471 | ||
5472 | AArch64_input_section<size, big_endian>* input_section = | |
5473 | new AArch64_input_section<size, big_endian>(relobj, shndx); | |
5474 | input_section->init(); | |
5475 | ||
5476 | // Register new AArch64_input_section in map for look-up. | |
5477 | std::pair<typename AArch64_input_section_map::iterator,bool> ins = | |
5478 | this->aarch64_input_section_map_.insert( | |
5479 | std::make_pair(sid, input_section)); | |
5480 | ||
5481 | // Make sure that it we have not created another AArch64_input_section | |
5482 | // for this input section already. | |
5483 | gold_assert(ins.second); | |
5484 | ||
5485 | return input_section; | |
5486 | } | |
5487 | ||
5488 | ||
5489 | // Relaxation hook. This is where we do stub generation. | |
5490 | ||
5491 | template<int size, bool big_endian> | |
5492 | bool | |
5493 | Target_aarch64<size, big_endian>::do_relax( | |
5494 | int pass, | |
5495 | const Input_objects* input_objects, | |
5496 | Symbol_table* symtab, | |
5497 | Layout* layout , | |
5498 | const Task* task) | |
5499 | { | |
5500 | gold_assert(!parameters->options().relocatable()); | |
5501 | if (pass == 1) | |
5502 | { | |
0bf32ea9 JY |
5503 | // We don't handle negative stub_group_size right now. |
5504 | this->stub_group_size_ = abs(parameters->options().stub_group_size()); | |
5505 | if (this->stub_group_size_ == 1) | |
83a01957 HS |
5506 | { |
5507 | // Leave room for 4096 4-byte stub entries. If we exceed that, then we | |
5508 | // will fail to link. The user will have to relink with an explicit | |
5509 | // group size option. | |
0bf32ea9 JY |
5510 | this->stub_group_size_ = The_reloc_stub::MAX_BRANCH_OFFSET - |
5511 | 4096 * 4; | |
83a01957 | 5512 | } |
0bf32ea9 | 5513 | group_sections(layout, this->stub_group_size_, true, task); |
83a01957 HS |
5514 | } |
5515 | else | |
5516 | { | |
5517 | // If this is not the first pass, addresses and file offsets have | |
5518 | // been reset at this point, set them here. | |
5519 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
5520 | sp != this->stub_tables_.end(); ++sp) | |
5521 | { | |
5522 | The_stub_table* stt = *sp; | |
5523 | The_aarch64_input_section* owner = stt->owner(); | |
5524 | off_t off = align_address(owner->original_size(), | |
5525 | stt->addralign()); | |
5526 | stt->set_address_and_file_offset(owner->address() + off, | |
5527 | owner->offset() + off); | |
5528 | } | |
5529 | } | |
5530 | ||
5531 | // Scan relocs for relocation stubs | |
5532 | for (Input_objects::Relobj_iterator op = input_objects->relobj_begin(); | |
5533 | op != input_objects->relobj_end(); | |
5534 | ++op) | |
5535 | { | |
5536 | The_aarch64_relobj* aarch64_relobj = | |
5537 | static_cast<The_aarch64_relobj*>(*op); | |
5538 | // Lock the object so we can read from it. This is only called | |
5539 | // single-threaded from Layout::finalize, so it is OK to lock. | |
5540 | Task_lock_obj<Object> tl(task, aarch64_relobj); | |
5541 | aarch64_relobj->scan_sections_for_stubs(this, symtab, layout); | |
5542 | } | |
5543 | ||
5544 | bool any_stub_table_changed = false; | |
5545 | for (Stub_table_iterator siter = this->stub_tables_.begin(); | |
5546 | siter != this->stub_tables_.end() && !any_stub_table_changed; ++siter) | |
5547 | { | |
5548 | The_stub_table* stub_table = *siter; | |
5549 | if (stub_table->update_data_size_changed_p()) | |
5550 | { | |
5551 | The_aarch64_input_section* owner = stub_table->owner(); | |
5552 | uint64_t address = owner->address(); | |
5553 | off_t offset = owner->offset(); | |
5554 | owner->reset_address_and_file_offset(); | |
5555 | owner->set_address_and_file_offset(address, offset); | |
5556 | ||
5557 | any_stub_table_changed = true; | |
5558 | } | |
5559 | } | |
5560 | ||
5561 | // Do not continue relaxation. | |
5562 | bool continue_relaxation = any_stub_table_changed; | |
5563 | if (!continue_relaxation) | |
5564 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
5565 | (sp != this->stub_tables_.end()); | |
5566 | ++sp) | |
5567 | (*sp)->finalize_stubs(); | |
5568 | ||
5569 | return continue_relaxation; | |
5570 | } | |
5571 | ||
5572 | ||
5573 | // Make a new Stub_table. | |
5574 | ||
5575 | template<int size, bool big_endian> | |
5576 | Stub_table<size, big_endian>* | |
5577 | Target_aarch64<size, big_endian>::new_stub_table( | |
5578 | AArch64_input_section<size, big_endian>* owner) | |
5579 | { | |
5580 | Stub_table<size, big_endian>* stub_table = | |
5581 | new Stub_table<size, big_endian>(owner); | |
5582 | stub_table->set_address(align_address( | |
5583 | owner->address() + owner->data_size(), 8)); | |
5584 | stub_table->set_file_offset(owner->offset() + owner->data_size()); | |
5585 | stub_table->finalize_data_size(); | |
5586 | ||
5587 | this->stub_tables_.push_back(stub_table); | |
5588 | ||
5589 | return stub_table; | |
5590 | } | |
5591 | ||
5592 | ||
3a531937 | 5593 | template<int size, bool big_endian> |
7fa5525f | 5594 | uint64_t |
3a531937 | 5595 | Target_aarch64<size, big_endian>::do_reloc_addend( |
7fa5525f | 5596 | void* arg, unsigned int r_type, uint64_t) const |
3a531937 JY |
5597 | { |
5598 | gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC); | |
5599 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
5600 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
5601 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
5602 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); | |
5603 | gold_assert(psymval->is_tls_symbol()); | |
5604 | // The value of a TLS symbol is the offset in the TLS segment. | |
5605 | return psymval->value(ti.object, 0); | |
5606 | } | |
9363c7c3 | 5607 | |
053a4d68 JY |
5608 | // Return the number of entries in the PLT. |
5609 | ||
5610 | template<int size, bool big_endian> | |
5611 | unsigned int | |
5612 | Target_aarch64<size, big_endian>::plt_entry_count() const | |
5613 | { | |
5614 | if (this->plt_ == NULL) | |
5615 | return 0; | |
5616 | return this->plt_->entry_count(); | |
5617 | } | |
5618 | ||
5619 | // Return the offset of the first non-reserved PLT entry. | |
5620 | ||
5621 | template<int size, bool big_endian> | |
5622 | unsigned int | |
5623 | Target_aarch64<size, big_endian>::first_plt_entry_offset() const | |
5624 | { | |
5625 | return this->plt_->first_plt_entry_offset(); | |
5626 | } | |
5627 | ||
5628 | // Return the size of each PLT entry. | |
5629 | ||
5630 | template<int size, bool big_endian> | |
5631 | unsigned int | |
5632 | Target_aarch64<size, big_endian>::plt_entry_size() const | |
5633 | { | |
5634 | return this->plt_->get_plt_entry_size(); | |
5635 | } | |
5636 | ||
3a531937 | 5637 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
053a4d68 JY |
5638 | |
5639 | template<int size, bool big_endian> | |
3a531937 JY |
5640 | void |
5641 | Target_aarch64<size, big_endian>::define_tls_base_symbol( | |
5642 | Symbol_table* symtab, Layout* layout) | |
053a4d68 | 5643 | { |
3a531937 JY |
5644 | if (this->tls_base_symbol_defined_) |
5645 | return; | |
5646 | ||
5647 | Output_segment* tls_segment = layout->tls_segment(); | |
5648 | if (tls_segment != NULL) | |
5649 | { | |
6b0ad2eb | 5650 | // _TLS_MODULE_BASE_ always points to the beginning of tls segment. |
3a531937 JY |
5651 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
5652 | Symbol_table::PREDEFINED, | |
5653 | tls_segment, 0, 0, | |
5654 | elfcpp::STT_TLS, | |
5655 | elfcpp::STB_LOCAL, | |
5656 | elfcpp::STV_HIDDEN, 0, | |
6b0ad2eb | 5657 | Symbol::SEGMENT_START, |
3a531937 JY |
5658 | true); |
5659 | } | |
5660 | this->tls_base_symbol_defined_ = true; | |
053a4d68 JY |
5661 | } |
5662 | ||
3a531937 | 5663 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
053a4d68 JY |
5664 | |
5665 | template<int size, bool big_endian> | |
3a531937 JY |
5666 | void |
5667 | Target_aarch64<size, big_endian>::reserve_tlsdesc_entries( | |
5668 | Symbol_table* symtab, Layout* layout) | |
053a4d68 | 5669 | { |
3a531937 JY |
5670 | if (this->plt_ == NULL) |
5671 | this->make_plt_section(symtab, layout); | |
5672 | ||
5673 | if (!this->plt_->has_tlsdesc_entry()) | |
053a4d68 | 5674 | { |
3a531937 JY |
5675 | // Allocate the TLSDESC_GOT entry. |
5676 | Output_data_got_aarch64<size, big_endian>* got = | |
5677 | this->got_section(symtab, layout); | |
5678 | unsigned int got_offset = got->add_constant(0); | |
5679 | ||
5680 | // Allocate the TLSDESC_PLT entry. | |
5681 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
053a4d68 | 5682 | } |
053a4d68 JY |
5683 | } |
5684 | ||
3a531937 | 5685 | // Create a GOT entry for the TLS module index. |
053a4d68 JY |
5686 | |
5687 | template<int size, bool big_endian> | |
3a531937 JY |
5688 | unsigned int |
5689 | Target_aarch64<size, big_endian>::got_mod_index_entry( | |
5690 | Symbol_table* symtab, Layout* layout, | |
5691 | Sized_relobj_file<size, big_endian>* object) | |
5692 | { | |
5693 | if (this->got_mod_index_offset_ == -1U) | |
5694 | { | |
5695 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
5696 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
5697 | Output_data_got_aarch64<size, big_endian>* got = | |
5698 | this->got_section(symtab, layout); | |
5699 | unsigned int got_offset = got->add_constant(0); | |
5700 | rela_dyn->add_local(object, 0, elfcpp::R_AARCH64_TLS_DTPMOD64, got, | |
5701 | got_offset, 0); | |
5702 | got->add_constant(0); | |
5703 | this->got_mod_index_offset_ = got_offset; | |
5704 | } | |
5705 | return this->got_mod_index_offset_; | |
5706 | } | |
5707 | ||
5708 | // Optimize the TLS relocation type based on what we know about the | |
5709 | // symbol. IS_FINAL is true if the final address of this symbol is | |
5710 | // known at link time. | |
5711 | ||
5712 | template<int size, bool big_endian> | |
5713 | tls::Tls_optimization | |
5714 | Target_aarch64<size, big_endian>::optimize_tls_reloc(bool is_final, | |
5715 | int r_type) | |
5716 | { | |
5717 | // If we are generating a shared library, then we can't do anything | |
5718 | // in the linker | |
5719 | if (parameters->options().shared()) | |
5720 | return tls::TLSOPT_NONE; | |
5721 | ||
5722 | switch (r_type) | |
5723 | { | |
5724 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: | |
5725 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: | |
5726 | case elfcpp::R_AARCH64_TLSDESC_LD_PREL19: | |
5727 | case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21: | |
5728 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: | |
5729 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
5730 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
5731 | case elfcpp::R_AARCH64_TLSDESC_OFF_G1: | |
5732 | case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC: | |
5733 | case elfcpp::R_AARCH64_TLSDESC_LDR: | |
5734 | case elfcpp::R_AARCH64_TLSDESC_ADD: | |
5735 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
5736 | // These are General-Dynamic which permits fully general TLS | |
5737 | // access. Since we know that we are generating an executable, | |
5738 | // we can convert this to Initial-Exec. If we also know that | |
5739 | // this is a local symbol, we can further switch to Local-Exec. | |
5740 | if (is_final) | |
5741 | return tls::TLSOPT_TO_LE; | |
5742 | return tls::TLSOPT_TO_IE; | |
5743 | ||
9726c3c1 HS |
5744 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
5745 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: | |
5746 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
5747 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: | |
6b0ad2eb JY |
5748 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
5749 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: | |
9726c3c1 HS |
5750 | // These are Local-Dynamic, which refer to local symbols in the |
5751 | // dynamic TLS block. Since we know that we generating an | |
5752 | // executable, we can switch to Local-Exec. | |
5753 | return tls::TLSOPT_TO_LE; | |
5754 | ||
3a531937 JY |
5755 | case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1: |
5756 | case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC: | |
5757 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: | |
5758 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: | |
5759 | case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19: | |
5760 | // These are Initial-Exec relocs which get the thread offset | |
5761 | // from the GOT. If we know that we are linking against the | |
5762 | // local symbol, we can switch to Local-Exec, which links the | |
5763 | // thread offset into the instruction. | |
5764 | if (is_final) | |
5765 | return tls::TLSOPT_TO_LE; | |
5766 | return tls::TLSOPT_NONE; | |
5767 | ||
5768 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: | |
5769 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
5770 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: | |
5771 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
5772 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: | |
5773 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: | |
5774 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: | |
5775 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: | |
5776 | // When we already have Local-Exec, there is nothing further we | |
5777 | // can do. | |
5778 | return tls::TLSOPT_NONE; | |
5779 | ||
5780 | default: | |
5781 | gold_unreachable(); | |
5782 | } | |
5783 | } | |
5784 | ||
5785 | // Returns true if this relocation type could be that of a function pointer. | |
5786 | ||
5787 | template<int size, bool big_endian> | |
5788 | inline bool | |
5789 | Target_aarch64<size, big_endian>::Scan::possible_function_pointer_reloc( | |
5790 | unsigned int r_type) | |
5791 | { | |
5792 | switch (r_type) | |
5793 | { | |
9726c3c1 HS |
5794 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: |
5795 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: | |
5796 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: | |
5797 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: | |
5798 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: | |
3a531937 JY |
5799 | { |
5800 | return true; | |
5801 | } | |
5802 | } | |
5803 | return false; | |
5804 | } | |
5805 | ||
5806 | // For safe ICF, scan a relocation for a local symbol to check if it | |
5807 | // corresponds to a function pointer being taken. In that case mark | |
5808 | // the function whose pointer was taken as not foldable. | |
5809 | ||
5810 | template<int size, bool big_endian> | |
5811 | inline bool | |
5812 | Target_aarch64<size, big_endian>::Scan::local_reloc_may_be_function_pointer( | |
5813 | Symbol_table* , | |
053a4d68 JY |
5814 | Layout* , |
5815 | Target_aarch64<size, big_endian>* , | |
5816 | Sized_relobj_file<size, big_endian>* , | |
5817 | unsigned int , | |
5818 | Output_section* , | |
5819 | const elfcpp::Rela<size, big_endian>& , | |
5820 | unsigned int r_type, | |
5821 | const elfcpp::Sym<size, big_endian>&) | |
5822 | { | |
9726c3c1 | 5823 | // When building a shared library, do not fold any local symbols. |
053a4d68 | 5824 | return (parameters->options().shared() |
9363c7c3 | 5825 | || possible_function_pointer_reloc(r_type)); |
053a4d68 JY |
5826 | } |
5827 | ||
5828 | // For safe ICF, scan a relocation for a global symbol to check if it | |
5829 | // corresponds to a function pointer being taken. In that case mark | |
5830 | // the function whose pointer was taken as not foldable. | |
5831 | ||
5832 | template<int size, bool big_endian> | |
5833 | inline bool | |
5834 | Target_aarch64<size, big_endian>::Scan::global_reloc_may_be_function_pointer( | |
5835 | Symbol_table* , | |
5836 | Layout* , | |
5837 | Target_aarch64<size, big_endian>* , | |
5838 | Sized_relobj_file<size, big_endian>* , | |
5839 | unsigned int , | |
5840 | Output_section* , | |
5841 | const elfcpp::Rela<size, big_endian>& , | |
5842 | unsigned int r_type, | |
5843 | Symbol* gsym) | |
5844 | { | |
5845 | // When building a shared library, do not fold symbols whose visibility | |
5846 | // is hidden, internal or protected. | |
5847 | return ((parameters->options().shared() | |
9363c7c3 JY |
5848 | && (gsym->visibility() == elfcpp::STV_INTERNAL |
5849 | || gsym->visibility() == elfcpp::STV_PROTECTED | |
5850 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
5851 | || possible_function_pointer_reloc(r_type)); | |
053a4d68 JY |
5852 | } |
5853 | ||
5854 | // Report an unsupported relocation against a local symbol. | |
5855 | ||
5856 | template<int size, bool big_endian> | |
5857 | void | |
5858 | Target_aarch64<size, big_endian>::Scan::unsupported_reloc_local( | |
5859 | Sized_relobj_file<size, big_endian>* object, | |
5860 | unsigned int r_type) | |
5861 | { | |
5862 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
5863 | object->name().c_str(), r_type); | |
5864 | } | |
5865 | ||
5866 | // We are about to emit a dynamic relocation of type R_TYPE. If the | |
5867 | // dynamic linker does not support it, issue an error. | |
5868 | ||
5869 | template<int size, bool big_endian> | |
5870 | void | |
5871 | Target_aarch64<size, big_endian>::Scan::check_non_pic(Relobj* object, | |
9363c7c3 | 5872 | unsigned int r_type) |
053a4d68 JY |
5873 | { |
5874 | gold_assert(r_type != elfcpp::R_AARCH64_NONE); | |
5875 | ||
5876 | switch (r_type) | |
5877 | { | |
5878 | // These are the relocation types supported by glibc for AARCH64. | |
5879 | case elfcpp::R_AARCH64_NONE: | |
5880 | case elfcpp::R_AARCH64_COPY: | |
5881 | case elfcpp::R_AARCH64_GLOB_DAT: | |
5882 | case elfcpp::R_AARCH64_JUMP_SLOT: | |
5883 | case elfcpp::R_AARCH64_RELATIVE: | |
5884 | case elfcpp::R_AARCH64_TLS_DTPREL64: | |
5885 | case elfcpp::R_AARCH64_TLS_DTPMOD64: | |
5886 | case elfcpp::R_AARCH64_TLS_TPREL64: | |
5887 | case elfcpp::R_AARCH64_TLSDESC: | |
5888 | case elfcpp::R_AARCH64_IRELATIVE: | |
5889 | case elfcpp::R_AARCH64_ABS32: | |
5890 | case elfcpp::R_AARCH64_ABS64: | |
5891 | return; | |
5892 | ||
5893 | default: | |
5894 | break; | |
5895 | } | |
5896 | ||
5897 | // This prevents us from issuing more than one error per reloc | |
5898 | // section. But we can still wind up issuing more than one | |
5899 | // error per object file. | |
5900 | if (this->issued_non_pic_error_) | |
5901 | return; | |
5902 | gold_assert(parameters->options().output_is_position_independent()); | |
5903 | object->error(_("requires unsupported dynamic reloc; " | |
9363c7c3 | 5904 | "recompile with -fPIC")); |
053a4d68 JY |
5905 | this->issued_non_pic_error_ = true; |
5906 | return; | |
5907 | } | |
5908 | ||
9726c3c1 HS |
5909 | // Return whether we need to make a PLT entry for a relocation of the |
5910 | // given type against a STT_GNU_IFUNC symbol. | |
5911 | ||
5912 | template<int size, bool big_endian> | |
5913 | bool | |
5914 | Target_aarch64<size, big_endian>::Scan::reloc_needs_plt_for_ifunc( | |
5915 | Sized_relobj_file<size, big_endian>* object, | |
5916 | unsigned int r_type) | |
5917 | { | |
5918 | const AArch64_reloc_property* arp = | |
5919 | aarch64_reloc_property_table->get_reloc_property(r_type); | |
5920 | gold_assert(arp != NULL); | |
5921 | ||
5922 | int flags = arp->reference_flags(); | |
5923 | if (flags & Symbol::TLS_REF) | |
5924 | { | |
5925 | gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"), | |
5926 | object->name().c_str(), arp->name().c_str()); | |
5927 | return false; | |
5928 | } | |
5929 | return flags != 0; | |
5930 | } | |
5931 | ||
053a4d68 JY |
5932 | // Scan a relocation for a local symbol. |
5933 | ||
5934 | template<int size, bool big_endian> | |
5935 | inline void | |
5936 | Target_aarch64<size, big_endian>::Scan::local( | |
8e33481e HS |
5937 | Symbol_table* symtab, |
5938 | Layout* layout, | |
5939 | Target_aarch64<size, big_endian>* target, | |
9363c7c3 | 5940 | Sized_relobj_file<size, big_endian>* object, |
8e33481e HS |
5941 | unsigned int data_shndx, |
5942 | Output_section* output_section, | |
5943 | const elfcpp::Rela<size, big_endian>& rela, | |
053a4d68 | 5944 | unsigned int r_type, |
9726c3c1 | 5945 | const elfcpp::Sym<size, big_endian>& lsym, |
053a4d68 JY |
5946 | bool is_discarded) |
5947 | { | |
5948 | if (is_discarded) | |
5949 | return; | |
5950 | ||
8e33481e | 5951 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
3a531937 JY |
5952 | Reloc_section; |
5953 | Output_data_got_aarch64<size, big_endian>* got = | |
5954 | target->got_section(symtab, layout); | |
5955 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
8e33481e | 5956 | |
9726c3c1 HS |
5957 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
5958 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; | |
5959 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
5960 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
5961 | ||
053a4d68 JY |
5962 | switch (r_type) |
5963 | { | |
9363c7c3 JY |
5964 | case elfcpp::R_AARCH64_ABS32: |
5965 | case elfcpp::R_AARCH64_ABS16: | |
8e33481e HS |
5966 | if (parameters->options().output_is_position_independent()) |
5967 | { | |
5968 | gold_error(_("%s: unsupported reloc %u in pos independent link."), | |
5969 | object->name().c_str(), r_type); | |
5970 | } | |
5971 | break; | |
5972 | ||
5973 | case elfcpp::R_AARCH64_ABS64: | |
9363c7c3 JY |
5974 | // If building a shared library or pie, we need to mark this as a dynmic |
5975 | // reloction, so that the dynamic loader can relocate it. | |
9363c7c3 JY |
5976 | if (parameters->options().output_is_position_independent()) |
5977 | { | |
8e33481e | 5978 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8e33481e HS |
5979 | rela_dyn->add_local_relative(object, r_sym, |
5980 | elfcpp::R_AARCH64_RELATIVE, | |
5981 | output_section, | |
5982 | data_shndx, | |
5983 | rela.get_r_offset(), | |
5984 | rela.get_r_addend(), | |
9726c3c1 | 5985 | is_ifunc); |
9363c7c3 JY |
5986 | } |
5987 | break; | |
5988 | ||
8e33481e HS |
5989 | case elfcpp::R_AARCH64_PREL64: |
5990 | case elfcpp::R_AARCH64_PREL32: | |
5991 | case elfcpp::R_AARCH64_PREL16: | |
5992 | break; | |
5993 | ||
4d2f5d58 HS |
5994 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
5995 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: | |
5996 | // This pair of relocations is used to access a specific GOT entry. | |
5997 | { | |
5998 | bool is_new = false; | |
5999 | // This symbol requires a GOT entry. | |
6000 | if (is_ifunc) | |
6001 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
6002 | else | |
6003 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
6004 | if (is_new && parameters->options().output_is_position_independent()) | |
6005 | target->rela_dyn_section(layout)-> | |
6006 | add_local_relative(object, | |
6007 | r_sym, | |
6008 | elfcpp::R_AARCH64_RELATIVE, | |
6009 | got, | |
6010 | object->local_got_offset(r_sym, | |
6011 | GOT_TYPE_STANDARD), | |
6012 | 0, | |
6013 | false); | |
6014 | } | |
6015 | break; | |
6016 | ||
3a531937 JY |
6017 | case elfcpp::R_AARCH64_LD_PREL_LO19: // 273 |
6018 | case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274 | |
6019 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275 | |
6020 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276 | |
6021 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277 | |
6022 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278 | |
6023 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284 | |
6024 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285 | |
6025 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286 | |
8e33481e | 6026 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299 |
3a531937 | 6027 | break; |
053a4d68 | 6028 | |
8e33481e HS |
6029 | // Control flow, pc-relative. We don't need to do anything for a relative |
6030 | // addressing relocation against a local symbol if it does not reference | |
6031 | // the GOT. | |
6032 | case elfcpp::R_AARCH64_TSTBR14: | |
6033 | case elfcpp::R_AARCH64_CONDBR19: | |
6034 | case elfcpp::R_AARCH64_JUMP26: | |
6035 | case elfcpp::R_AARCH64_CALL26: | |
6036 | break; | |
6037 | ||
6038 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: | |
6039 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: | |
6040 | { | |
3a531937 JY |
6041 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
6042 | optimize_tls_reloc(!parameters->options().shared(), r_type); | |
6043 | if (tlsopt == tls::TLSOPT_TO_LE) | |
6044 | break; | |
6045 | ||
8e33481e HS |
6046 | layout->set_has_static_tls(); |
6047 | // Create a GOT entry for the tp-relative offset. | |
8e33481e HS |
6048 | if (!parameters->doing_static_link()) |
6049 | { | |
6050 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, | |
6051 | target->rela_dyn_section(layout), | |
6052 | elfcpp::R_AARCH64_TLS_TPREL64); | |
6053 | } | |
6054 | else if (!object->local_has_got_offset(r_sym, | |
6055 | GOT_TYPE_TLS_OFFSET)) | |
6056 | { | |
6057 | got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET); | |
6058 | unsigned int got_offset = | |
6059 | object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET); | |
6060 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
6061 | gold_assert(addend == 0); | |
6062 | got->add_static_reloc(got_offset, elfcpp::R_AARCH64_TLS_TPREL64, | |
6063 | object, r_sym); | |
6064 | } | |
6065 | } | |
6066 | break; | |
6067 | ||
3a531937 JY |
6068 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
6069 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: | |
6070 | { | |
6071 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
6072 | optimize_tls_reloc(!parameters->options().shared(), r_type); | |
6073 | if (tlsopt == tls::TLSOPT_TO_LE) | |
6074 | { | |
6075 | layout->set_has_static_tls(); | |
6076 | break; | |
6077 | } | |
6078 | gold_assert(tlsopt == tls::TLSOPT_NONE); | |
6079 | ||
6080 | got->add_local_pair_with_rel(object,r_sym, data_shndx, | |
6081 | GOT_TYPE_TLS_PAIR, | |
6082 | target->rela_dyn_section(layout), | |
6083 | elfcpp::R_AARCH64_TLS_DTPMOD64); | |
6084 | } | |
6085 | break; | |
6086 | ||
1a920511 JY |
6087 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
6088 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
6089 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: | |
6090 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
6091 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: | |
8e33481e HS |
6092 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
6093 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: | |
6094 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: | |
6095 | { | |
6096 | layout->set_has_static_tls(); | |
6097 | bool output_is_shared = parameters->options().shared(); | |
6098 | if (output_is_shared) | |
3a531937 | 6099 | gold_error(_("%s: unsupported TLSLE reloc %u in shared code."), |
8e33481e HS |
6100 | object->name().c_str(), r_type); |
6101 | } | |
9363c7c3 JY |
6102 | break; |
6103 | ||
9726c3c1 HS |
6104 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
6105 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: | |
6106 | { | |
6107 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
6108 | optimize_tls_reloc(!parameters->options().shared(), r_type); | |
6109 | if (tlsopt == tls::TLSOPT_NONE) | |
6110 | { | |
6111 | // Create a GOT entry for the module index. | |
6112 | target->got_mod_index_entry(symtab, layout, object); | |
6113 | } | |
6114 | else if (tlsopt != tls::TLSOPT_TO_LE) | |
6115 | unsupported_reloc_local(object, r_type); | |
6116 | } | |
6117 | break; | |
6118 | ||
6119 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
6120 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: | |
6b0ad2eb JY |
6121 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
6122 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: | |
9726c3c1 HS |
6123 | break; |
6124 | ||
3a531937 JY |
6125 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
6126 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
6127 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
6128 | { | |
6129 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
6130 | optimize_tls_reloc(!parameters->options().shared(), r_type); | |
6131 | target->define_tls_base_symbol(symtab, layout); | |
6132 | if (tlsopt == tls::TLSOPT_NONE) | |
6133 | { | |
6134 | // Create reserved PLT and GOT entries for the resolver. | |
6135 | target->reserve_tlsdesc_entries(symtab, layout); | |
6136 | ||
6137 | // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc. | |
6138 | // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT | |
6139 | // entry needs to be in an area in .got.plt, not .got. Call | |
6140 | // got_section to make sure the section has been created. | |
6141 | target->got_section(symtab, layout); | |
6142 | Output_data_got<size, big_endian>* got = | |
6143 | target->got_tlsdesc_section(); | |
6144 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
6145 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) | |
6146 | { | |
6147 | unsigned int got_offset = got->add_constant(0); | |
6148 | got->add_constant(0); | |
6149 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
6150 | got_offset); | |
6151 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
6152 | // We store the arguments we need in a vector, and use | |
6153 | // the index into the vector as the parameter to pass | |
6154 | // to the target specific routines. | |
6155 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
6156 | void* arg = reinterpret_cast<void*>(intarg); | |
6157 | rt->add_target_specific(elfcpp::R_AARCH64_TLSDESC, arg, | |
6158 | got, got_offset, 0); | |
6159 | } | |
6160 | } | |
6161 | else if (tlsopt != tls::TLSOPT_TO_LE) | |
6162 | unsupported_reloc_local(object, r_type); | |
6163 | } | |
6164 | break; | |
6165 | ||
6166 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
6167 | break; | |
6168 | ||
9363c7c3 JY |
6169 | default: |
6170 | unsupported_reloc_local(object, r_type); | |
053a4d68 JY |
6171 | } |
6172 | } | |
6173 | ||
6174 | ||
6175 | // Report an unsupported relocation against a global symbol. | |
6176 | ||
6177 | template<int size, bool big_endian> | |
6178 | void | |
6179 | Target_aarch64<size, big_endian>::Scan::unsupported_reloc_global( | |
6180 | Sized_relobj_file<size, big_endian>* object, | |
6181 | unsigned int r_type, | |
6182 | Symbol* gsym) | |
6183 | { | |
6184 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), | |
6185 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); | |
6186 | } | |
6187 | ||
6188 | template<int size, bool big_endian> | |
6189 | inline void | |
6190 | Target_aarch64<size, big_endian>::Scan::global( | |
9363c7c3 JY |
6191 | Symbol_table* symtab, |
6192 | Layout* layout, | |
6193 | Target_aarch64<size, big_endian>* target, | |
8e33481e HS |
6194 | Sized_relobj_file<size, big_endian> * object, |
6195 | unsigned int data_shndx, | |
6196 | Output_section* output_section, | |
6197 | const elfcpp::Rela<size, big_endian>& rela, | |
9363c7c3 JY |
6198 | unsigned int r_type, |
6199 | Symbol* gsym) | |
053a4d68 | 6200 | { |
9726c3c1 HS |
6201 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
6202 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
6203 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
6204 | target->make_plt_entry(symtab, layout, gsym); | |
6205 | ||
8e33481e HS |
6206 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
6207 | Reloc_section; | |
3a531937 JY |
6208 | const AArch64_reloc_property* arp = |
6209 | aarch64_reloc_property_table->get_reloc_property(r_type); | |
6210 | gold_assert(arp != NULL); | |
6211 | ||
9363c7c3 JY |
6212 | switch (r_type) |
6213 | { | |
8e33481e HS |
6214 | case elfcpp::R_AARCH64_ABS16: |
6215 | case elfcpp::R_AARCH64_ABS32: | |
9363c7c3 | 6216 | case elfcpp::R_AARCH64_ABS64: |
8e33481e HS |
6217 | { |
6218 | // Make a PLT entry if necessary. | |
6219 | if (gsym->needs_plt_entry()) | |
6220 | { | |
6221 | target->make_plt_entry(symtab, layout, gsym); | |
6222 | // Since this is not a PC-relative relocation, we may be | |
6223 | // taking the address of a function. In that case we need to | |
6224 | // set the entry in the dynamic symbol table to the address of | |
6225 | // the PLT entry. | |
6226 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
6227 | gsym->set_needs_dynsym_value(); | |
6228 | } | |
6229 | // Make a dynamic relocation if necessary. | |
8e33481e HS |
6230 | if (gsym->needs_dynamic_reloc(arp->reference_flags())) |
6231 | { | |
6232 | if (!parameters->options().output_is_position_independent() | |
6233 | && gsym->may_need_copy_reloc()) | |
6234 | { | |
3a531937 JY |
6235 | target->copy_reloc(symtab, layout, object, |
6236 | data_shndx, output_section, gsym, rela); | |
8e33481e | 6237 | } |
9726c3c1 HS |
6238 | else if (r_type == elfcpp::R_AARCH64_ABS64 |
6239 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
6240 | && gsym->can_use_relative_reloc(false) | |
6241 | && !gsym->is_from_dynobj() | |
6242 | && !gsym->is_undefined() | |
6243 | && !gsym->is_preemptible()) | |
6244 | { | |
6245 | // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC | |
6246 | // symbol. This makes a function address in a PIE executable | |
6247 | // match the address in a shared library that it links against. | |
6248 | Reloc_section* rela_dyn = | |
6249 | target->rela_irelative_section(layout); | |
6250 | unsigned int r_type = elfcpp::R_AARCH64_IRELATIVE; | |
6251 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
6252 | output_section, object, | |
6253 | data_shndx, | |
6254 | rela.get_r_offset(), | |
6255 | rela.get_r_addend()); | |
6256 | } | |
8e33481e HS |
6257 | else if (r_type == elfcpp::R_AARCH64_ABS64 |
6258 | && gsym->can_use_relative_reloc(false)) | |
6259 | { | |
6260 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
6261 | rela_dyn->add_global_relative(gsym, | |
6262 | elfcpp::R_AARCH64_RELATIVE, | |
6263 | output_section, | |
6264 | object, | |
6265 | data_shndx, | |
6266 | rela.get_r_offset(), | |
6267 | rela.get_r_addend(), | |
6268 | false); | |
6269 | } | |
6270 | else | |
6271 | { | |
6272 | check_non_pic(object, r_type); | |
6273 | Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>* | |
6274 | rela_dyn = target->rela_dyn_section(layout); | |
6275 | rela_dyn->add_global( | |
6276 | gsym, r_type, output_section, object, | |
6277 | data_shndx, rela.get_r_offset(),rela.get_r_addend()); | |
6278 | } | |
6279 | } | |
6280 | } | |
6281 | break; | |
6282 | ||
6283 | case elfcpp::R_AARCH64_PREL16: | |
6284 | case elfcpp::R_AARCH64_PREL32: | |
6285 | case elfcpp::R_AARCH64_PREL64: | |
9363c7c3 JY |
6286 | // This is used to fill the GOT absolute address. |
6287 | if (gsym->needs_plt_entry()) | |
6288 | { | |
6289 | target->make_plt_entry(symtab, layout, gsym); | |
6290 | } | |
6291 | break; | |
6292 | ||
3a531937 JY |
6293 | case elfcpp::R_AARCH64_LD_PREL_LO19: // 273 |
6294 | case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274 | |
6295 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275 | |
6296 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276 | |
6297 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277 | |
6298 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278 | |
6299 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284 | |
6300 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285 | |
6301 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286 | |
8e33481e | 6302 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299 |
9363c7c3 | 6303 | { |
3a531937 JY |
6304 | if (gsym->needs_plt_entry()) |
6305 | target->make_plt_entry(symtab, layout, gsym); | |
6306 | // Make a dynamic relocation if necessary. | |
6307 | if (gsym->needs_dynamic_reloc(arp->reference_flags())) | |
6308 | { | |
6309 | if (parameters->options().output_is_executable() | |
6310 | && gsym->may_need_copy_reloc()) | |
6311 | { | |
6312 | target->copy_reloc(symtab, layout, object, | |
6313 | data_shndx, output_section, gsym, rela); | |
6314 | } | |
6315 | } | |
9363c7c3 JY |
6316 | break; |
6317 | } | |
6318 | ||
6319 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: | |
6320 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: | |
6321 | { | |
6322 | // This pair of relocations is used to access a specific GOT entry. | |
6323 | // Note a GOT entry is an *address* to a symbol. | |
6324 | // The symbol requires a GOT entry | |
6325 | Output_data_got_aarch64<size, big_endian>* got = | |
6326 | target->got_section(symtab, layout); | |
6327 | if (gsym->final_value_is_known()) | |
6328 | { | |
9726c3c1 HS |
6329 | // For a STT_GNU_IFUNC symbol we want the PLT address. |
6330 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
6331 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
6332 | else | |
6333 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
9363c7c3 JY |
6334 | } |
6335 | else | |
6336 | { | |
9726c3c1 HS |
6337 | // If this symbol is not fully resolved, we need to add a dynamic |
6338 | // relocation for it. | |
9363c7c3 | 6339 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
9726c3c1 HS |
6340 | |
6341 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
6342 | // | |
6343 | // 1) The symbol may be defined in some other module. | |
6344 | // 2) We are building a shared library and this is a protected | |
6345 | // symbol; using GLOB_DAT means that the dynamic linker can use | |
6346 | // the address of the PLT in the main executable when appropriate | |
6347 | // so that function address comparisons work. | |
6348 | // 3) This is a STT_GNU_IFUNC symbol in position dependent code, | |
6349 | // again so that function address comparisons work. | |
9363c7c3 JY |
6350 | if (gsym->is_from_dynobj() |
6351 | || gsym->is_undefined() | |
6352 | || gsym->is_preemptible() | |
6353 | || (gsym->visibility() == elfcpp::STV_PROTECTED | |
9726c3c1 HS |
6354 | && parameters->options().shared()) |
6355 | || (gsym->type() == elfcpp::STT_GNU_IFUNC | |
6356 | && parameters->options().output_is_position_independent())) | |
9363c7c3 JY |
6357 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
6358 | rela_dyn, elfcpp::R_AARCH64_GLOB_DAT); | |
6359 | else | |
6360 | { | |
9726c3c1 HS |
6361 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
6362 | // offset into the GOT, so that function pointer | |
6363 | // comparisons work correctly. | |
6364 | bool is_new; | |
6365 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
6366 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
6367 | else | |
6368 | { | |
6369 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
6370 | // Tell the dynamic linker to use the PLT address | |
6371 | // when resolving relocations. | |
6372 | if (gsym->is_from_dynobj() | |
6373 | && !parameters->options().shared()) | |
6374 | gsym->set_needs_dynsym_value(); | |
6375 | } | |
6376 | if (is_new) | |
3a531937 JY |
6377 | { |
6378 | rela_dyn->add_global_relative( | |
6379 | gsym, elfcpp::R_AARCH64_RELATIVE, | |
6380 | got, | |
6381 | gsym->got_offset(GOT_TYPE_STANDARD), | |
6382 | 0, | |
6383 | false); | |
6384 | } | |
9363c7c3 JY |
6385 | } |
6386 | } | |
6387 | break; | |
6388 | } | |
6389 | ||
8e33481e HS |
6390 | case elfcpp::R_AARCH64_TSTBR14: |
6391 | case elfcpp::R_AARCH64_CONDBR19: | |
9363c7c3 JY |
6392 | case elfcpp::R_AARCH64_JUMP26: |
6393 | case elfcpp::R_AARCH64_CALL26: | |
6394 | { | |
6395 | if (gsym->final_value_is_known()) | |
6396 | break; | |
6397 | ||
6398 | if (gsym->is_defined() && | |
6399 | !gsym->is_from_dynobj() && | |
6400 | !gsym->is_preemptible()) | |
6401 | break; | |
6402 | ||
6403 | // Make plt entry for function call. | |
9363c7c3 JY |
6404 | target->make_plt_entry(symtab, layout, gsym); |
6405 | break; | |
6406 | } | |
6407 | ||
3a531937 JY |
6408 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
6409 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // General dynamic | |
6410 | { | |
6411 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
6412 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); | |
6413 | if (tlsopt == tls::TLSOPT_TO_LE) | |
6414 | { | |
6415 | layout->set_has_static_tls(); | |
6416 | break; | |
6417 | } | |
6418 | gold_assert(tlsopt == tls::TLSOPT_NONE); | |
6419 | ||
6420 | // General dynamic. | |
6421 | Output_data_got_aarch64<size, big_endian>* got = | |
6422 | target->got_section(symtab, layout); | |
6423 | // Create 2 consecutive entries for module index and offset. | |
6424 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
6425 | target->rela_dyn_section(layout), | |
6426 | elfcpp::R_AARCH64_TLS_DTPMOD64, | |
6427 | elfcpp::R_AARCH64_TLS_DTPREL64); | |
6428 | } | |
6429 | break; | |
6430 | ||
9726c3c1 HS |
6431 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
6432 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local dynamic | |
6433 | { | |
6434 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
6435 | optimize_tls_reloc(!parameters->options().shared(), r_type); | |
6436 | if (tlsopt == tls::TLSOPT_NONE) | |
6437 | { | |
6438 | // Create a GOT entry for the module index. | |
6439 | target->got_mod_index_entry(symtab, layout, object); | |
6440 | } | |
6441 | else if (tlsopt != tls::TLSOPT_TO_LE) | |
6442 | unsupported_reloc_local(object, r_type); | |
6443 | } | |
6444 | break; | |
6445 | ||
6446 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
6b0ad2eb JY |
6447 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
6448 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: | |
6449 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local dynamic | |
9726c3c1 HS |
6450 | break; |
6451 | ||
8e33481e | 6452 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
3a531937 | 6453 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial executable |
8e33481e | 6454 | { |
9726c3c1 | 6455 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
3a531937 JY |
6456 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
6457 | if (tlsopt == tls::TLSOPT_TO_LE) | |
6458 | break; | |
6459 | ||
8e33481e HS |
6460 | layout->set_has_static_tls(); |
6461 | // Create a GOT entry for the tp-relative offset. | |
6462 | Output_data_got_aarch64<size, big_endian>* got | |
6463 | = target->got_section(symtab, layout); | |
6464 | if (!parameters->doing_static_link()) | |
6465 | { | |
6466 | got->add_global_with_rel( | |
6467 | gsym, GOT_TYPE_TLS_OFFSET, | |
6468 | target->rela_dyn_section(layout), | |
6469 | elfcpp::R_AARCH64_TLS_TPREL64); | |
6470 | } | |
6471 | if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)) | |
6472 | { | |
6473 | got->add_global(gsym, GOT_TYPE_TLS_OFFSET); | |
6474 | unsigned int got_offset = | |
6475 | gsym->got_offset(GOT_TYPE_TLS_OFFSET); | |
6476 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
6477 | gold_assert(addend == 0); | |
6478 | got->add_static_reloc(got_offset, | |
6479 | elfcpp::R_AARCH64_TLS_TPREL64, gsym); | |
6480 | } | |
6481 | } | |
6482 | break; | |
6483 | ||
1a920511 JY |
6484 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
6485 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
6486 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: | |
6487 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
6488 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: | |
8e33481e HS |
6489 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
6490 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: | |
3a531937 | 6491 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: // Local executable |
8e33481e HS |
6492 | layout->set_has_static_tls(); |
6493 | if (parameters->options().shared()) | |
6494 | gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."), | |
6495 | object->name().c_str(), r_type); | |
6496 | break; | |
6497 | ||
3a531937 JY |
6498 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
6499 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
6500 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: // TLS descriptor | |
6501 | { | |
6502 | target->define_tls_base_symbol(symtab, layout); | |
6503 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
6504 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); | |
6505 | if (tlsopt == tls::TLSOPT_NONE) | |
6506 | { | |
6507 | // Create reserved PLT and GOT entries for the resolver. | |
6508 | target->reserve_tlsdesc_entries(symtab, layout); | |
6509 | ||
6510 | // Create a double GOT entry with an R_AARCH64_TLSDESC | |
6511 | // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT | |
6512 | // entry needs to be in an area in .got.plt, not .got. Call | |
6513 | // got_section to make sure the section has been created. | |
6514 | target->got_section(symtab, layout); | |
6515 | Output_data_got<size, big_endian>* got = | |
6516 | target->got_tlsdesc_section(); | |
6517 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
6518 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
6519 | elfcpp::R_AARCH64_TLSDESC, 0); | |
6520 | } | |
6521 | else if (tlsopt == tls::TLSOPT_TO_IE) | |
6522 | { | |
6523 | // Create a GOT entry for the tp-relative offset. | |
6524 | Output_data_got<size, big_endian>* got | |
6525 | = target->got_section(symtab, layout); | |
6526 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
6527 | target->rela_dyn_section(layout), | |
6528 | elfcpp::R_AARCH64_TLS_TPREL64); | |
6529 | } | |
6530 | else if (tlsopt != tls::TLSOPT_TO_LE) | |
6531 | unsupported_reloc_global(object, r_type, gsym); | |
6532 | } | |
6533 | break; | |
6534 | ||
6535 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
6536 | break; | |
6537 | ||
9363c7c3 | 6538 | default: |
8e33481e | 6539 | gold_error(_("%s: unsupported reloc type in global scan"), |
3a531937 JY |
6540 | aarch64_reloc_property_table-> |
6541 | reloc_name_in_error_message(r_type).c_str()); | |
9363c7c3 | 6542 | } |
053a4d68 | 6543 | return; |
9363c7c3 JY |
6544 | } // End of Scan::global |
6545 | ||
3a531937 | 6546 | |
9363c7c3 JY |
6547 | // Create the PLT section. |
6548 | template<int size, bool big_endian> | |
6549 | void | |
6550 | Target_aarch64<size, big_endian>::make_plt_section( | |
6551 | Symbol_table* symtab, Layout* layout) | |
6552 | { | |
6553 | if (this->plt_ == NULL) | |
6554 | { | |
6555 | // Create the GOT section first. | |
6556 | this->got_section(symtab, layout); | |
6557 | ||
3a531937 JY |
6558 | this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
6559 | this->got_irelative_); | |
9363c7c3 JY |
6560 | |
6561 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
6562 | (elfcpp::SHF_ALLOC | |
6563 | | elfcpp::SHF_EXECINSTR), | |
6564 | this->plt_, ORDER_PLT, false); | |
6565 | ||
6566 | // Make the sh_info field of .rela.plt point to .plt. | |
6567 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
6568 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
6569 | } | |
6570 | } | |
6571 | ||
3a531937 JY |
6572 | // Return the section for TLSDESC relocations. |
6573 | ||
6574 | template<int size, bool big_endian> | |
6575 | typename Target_aarch64<size, big_endian>::Reloc_section* | |
6576 | Target_aarch64<size, big_endian>::rela_tlsdesc_section(Layout* layout) const | |
6577 | { | |
6578 | return this->plt_section()->rela_tlsdesc(layout); | |
6579 | } | |
6580 | ||
9363c7c3 JY |
6581 | // Create a PLT entry for a global symbol. |
6582 | ||
6583 | template<int size, bool big_endian> | |
6584 | void | |
6585 | Target_aarch64<size, big_endian>::make_plt_entry( | |
6586 | Symbol_table* symtab, | |
6587 | Layout* layout, | |
6588 | Symbol* gsym) | |
6589 | { | |
6590 | if (gsym->has_plt_offset()) | |
6591 | return; | |
6592 | ||
6593 | if (this->plt_ == NULL) | |
6594 | this->make_plt_section(symtab, layout); | |
6595 | ||
9726c3c1 HS |
6596 | this->plt_->add_entry(symtab, layout, gsym); |
6597 | } | |
6598 | ||
6599 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. | |
6600 | ||
6601 | template<int size, bool big_endian> | |
6602 | void | |
6603 | Target_aarch64<size, big_endian>::make_local_ifunc_plt_entry( | |
6604 | Symbol_table* symtab, Layout* layout, | |
6605 | Sized_relobj_file<size, big_endian>* relobj, | |
6606 | unsigned int local_sym_index) | |
6607 | { | |
6608 | if (relobj->local_has_plt_offset(local_sym_index)) | |
6609 | return; | |
6610 | if (this->plt_ == NULL) | |
6611 | this->make_plt_section(symtab, layout); | |
6612 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, | |
6613 | relobj, | |
6614 | local_sym_index); | |
6615 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
053a4d68 JY |
6616 | } |
6617 | ||
6618 | template<int size, bool big_endian> | |
6619 | void | |
6620 | Target_aarch64<size, big_endian>::gc_process_relocs( | |
6621 | Symbol_table* symtab, | |
6622 | Layout* layout, | |
6623 | Sized_relobj_file<size, big_endian>* object, | |
6624 | unsigned int data_shndx, | |
6625 | unsigned int sh_type, | |
6626 | const unsigned char* prelocs, | |
6627 | size_t reloc_count, | |
6628 | Output_section* output_section, | |
6629 | bool needs_special_offset_handling, | |
6630 | size_t local_symbol_count, | |
6631 | const unsigned char* plocal_symbols) | |
6632 | { | |
6633 | if (sh_type == elfcpp::SHT_REL) | |
6634 | { | |
6635 | return; | |
6636 | } | |
6637 | ||
9363c7c3 JY |
6638 | gold::gc_process_relocs< |
6639 | size, big_endian, | |
6640 | Target_aarch64<size, big_endian>, | |
6641 | elfcpp::SHT_RELA, | |
6642 | typename Target_aarch64<size, big_endian>::Scan, | |
6643 | typename Target_aarch64<size, big_endian>::Relocatable_size_for_reloc>( | |
053a4d68 JY |
6644 | symtab, |
6645 | layout, | |
6646 | this, | |
6647 | object, | |
6648 | data_shndx, | |
6649 | prelocs, | |
6650 | reloc_count, | |
6651 | output_section, | |
6652 | needs_special_offset_handling, | |
6653 | local_symbol_count, | |
6654 | plocal_symbols); | |
6655 | } | |
6656 | ||
6657 | // Scan relocations for a section. | |
6658 | ||
6659 | template<int size, bool big_endian> | |
6660 | void | |
6661 | Target_aarch64<size, big_endian>::scan_relocs( | |
6662 | Symbol_table* symtab, | |
6663 | Layout* layout, | |
6664 | Sized_relobj_file<size, big_endian>* object, | |
6665 | unsigned int data_shndx, | |
6666 | unsigned int sh_type, | |
6667 | const unsigned char* prelocs, | |
6668 | size_t reloc_count, | |
6669 | Output_section* output_section, | |
6670 | bool needs_special_offset_handling, | |
6671 | size_t local_symbol_count, | |
6672 | const unsigned char* plocal_symbols) | |
6673 | { | |
6674 | if (sh_type == elfcpp::SHT_REL) | |
6675 | { | |
6676 | gold_error(_("%s: unsupported REL reloc section"), | |
6677 | object->name().c_str()); | |
6678 | return; | |
6679 | } | |
9363c7c3 | 6680 | gold::scan_relocs<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, Scan>( |
053a4d68 JY |
6681 | symtab, |
6682 | layout, | |
6683 | this, | |
6684 | object, | |
6685 | data_shndx, | |
6686 | prelocs, | |
6687 | reloc_count, | |
6688 | output_section, | |
6689 | needs_special_offset_handling, | |
6690 | local_symbol_count, | |
6691 | plocal_symbols); | |
6692 | } | |
6693 | ||
3a531937 JY |
6694 | // Return the value to use for a dynamic which requires special |
6695 | // treatment. This is how we support equality comparisons of function | |
6696 | // pointers across shared library boundaries, as described in the | |
6697 | // processor specific ABI supplement. | |
6698 | ||
83a01957 | 6699 | template<int size, bool big_endian> |
3a531937 | 6700 | uint64_t |
83a01957 | 6701 | Target_aarch64<size, big_endian>::do_dynsym_value(const Symbol* gsym) const |
3a531937 JY |
6702 | { |
6703 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
6704 | return this->plt_address_for_global(gsym); | |
6705 | } | |
6706 | ||
83a01957 | 6707 | |
053a4d68 JY |
6708 | // Finalize the sections. |
6709 | ||
6710 | template<int size, bool big_endian> | |
6711 | void | |
6712 | Target_aarch64<size, big_endian>::do_finalize_sections( | |
9363c7c3 | 6713 | Layout* layout, |
053a4d68 | 6714 | const Input_objects*, |
9363c7c3 | 6715 | Symbol_table* symtab) |
053a4d68 | 6716 | { |
9363c7c3 JY |
6717 | const Reloc_section* rel_plt = (this->plt_ == NULL |
6718 | ? NULL | |
6719 | : this->plt_->rela_plt()); | |
6720 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, | |
6721 | this->rela_dyn_, true, false); | |
6722 | ||
3a531937 JY |
6723 | // Emit any relocs we saved in an attempt to avoid generating COPY |
6724 | // relocs. | |
6725 | if (this->copy_relocs_.any_saved_relocs()) | |
6726 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
6727 | ||
6728 | // Fill in some more dynamic tags. | |
6729 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
6730 | if (odyn != NULL) | |
6731 | { | |
6732 | if (this->plt_ != NULL | |
6733 | && this->plt_->output_section() != NULL | |
6734 | && this->plt_ ->has_tlsdesc_entry()) | |
6735 | { | |
6736 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); | |
6737 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
6738 | this->got_->finalize_data_size(); | |
6739 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
6740 | this->plt_, plt_offset); | |
6741 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
6742 | this->got_, got_offset); | |
6743 | } | |
6744 | } | |
6745 | ||
9363c7c3 JY |
6746 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of |
6747 | // the .got.plt section. | |
6748 | Symbol* sym = this->global_offset_table_; | |
6749 | if (sym != NULL) | |
6750 | { | |
6751 | uint64_t data_size = this->got_plt_->current_data_size(); | |
6752 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); | |
6753 | ||
6754 | // If the .got section is more than 0x8000 bytes, we add | |
6755 | // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16 | |
6756 | // bit relocations have a greater chance of working. | |
6757 | if (data_size >= 0x8000) | |
6758 | symtab->get_sized_symbol<size>(sym)->set_value( | |
6759 | symtab->get_sized_symbol<size>(sym)->value() + 0x8000); | |
6760 | } | |
6761 | ||
6762 | if (parameters->doing_static_link() | |
6763 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
6764 | { | |
6765 | // If linking statically, make sure that the __rela_iplt symbols | |
6766 | // were defined if necessary, even if we didn't create a PLT. | |
6767 | static const Define_symbol_in_segment syms[] = | |
6768 | { | |
6769 | { | |
6770 | "__rela_iplt_start", // name | |
6771 | elfcpp::PT_LOAD, // segment_type | |
6772 | elfcpp::PF_W, // segment_flags_set | |
6773 | elfcpp::PF(0), // segment_flags_clear | |
6774 | 0, // value | |
6775 | 0, // size | |
6776 | elfcpp::STT_NOTYPE, // type | |
6777 | elfcpp::STB_GLOBAL, // binding | |
6778 | elfcpp::STV_HIDDEN, // visibility | |
6779 | 0, // nonvis | |
6780 | Symbol::SEGMENT_START, // offset_from_base | |
6781 | true // only_if_ref | |
6782 | }, | |
6783 | { | |
6784 | "__rela_iplt_end", // name | |
6785 | elfcpp::PT_LOAD, // segment_type | |
6786 | elfcpp::PF_W, // segment_flags_set | |
6787 | elfcpp::PF(0), // segment_flags_clear | |
6788 | 0, // value | |
6789 | 0, // size | |
6790 | elfcpp::STT_NOTYPE, // type | |
6791 | elfcpp::STB_GLOBAL, // binding | |
6792 | elfcpp::STV_HIDDEN, // visibility | |
6793 | 0, // nonvis | |
6794 | Symbol::SEGMENT_START, // offset_from_base | |
6795 | true // only_if_ref | |
6796 | } | |
6797 | }; | |
6798 | ||
6799 | symtab->define_symbols(layout, 2, syms, | |
6800 | layout->script_options()->saw_sections_clause()); | |
6801 | } | |
6802 | ||
053a4d68 JY |
6803 | return; |
6804 | } | |
6805 | ||
6806 | // Perform a relocation. | |
6807 | ||
6808 | template<int size, bool big_endian> | |
6809 | inline bool | |
6810 | Target_aarch64<size, big_endian>::Relocate::relocate( | |
9363c7c3 | 6811 | const Relocate_info<size, big_endian>* relinfo, |
91a65d2f | 6812 | unsigned int, |
9363c7c3 | 6813 | Target_aarch64<size, big_endian>* target, |
053a4d68 | 6814 | Output_section* , |
9363c7c3 | 6815 | size_t relnum, |
91a65d2f | 6816 | const unsigned char* preloc, |
9363c7c3 JY |
6817 | const Sized_symbol<size>* gsym, |
6818 | const Symbol_value<size>* psymval, | |
6819 | unsigned char* view, | |
6820 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
053a4d68 JY |
6821 | section_size_type /* view_size */) |
6822 | { | |
9363c7c3 JY |
6823 | if (view == NULL) |
6824 | return true; | |
6825 | ||
6826 | typedef AArch64_relocate_functions<size, big_endian> Reloc; | |
6827 | ||
91a65d2f AM |
6828 | const elfcpp::Rela<size, big_endian> rela(preloc); |
6829 | unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info()); | |
9363c7c3 JY |
6830 | const AArch64_reloc_property* reloc_property = |
6831 | aarch64_reloc_property_table->get_reloc_property(r_type); | |
6832 | ||
6833 | if (reloc_property == NULL) | |
6834 | { | |
6835 | std::string reloc_name = | |
6836 | aarch64_reloc_property_table->reloc_name_in_error_message(r_type); | |
6837 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
6838 | _("cannot relocate %s in object file"), | |
6839 | reloc_name.c_str()); | |
6840 | return true; | |
6841 | } | |
6842 | ||
6843 | const Sized_relobj_file<size, big_endian>* object = relinfo->object; | |
6844 | ||
6845 | // Pick the value to use for symbols defined in the PLT. | |
6846 | Symbol_value<size> symval; | |
6847 | if (gsym != NULL | |
6848 | && gsym->use_plt_offset(reloc_property->reference_flags())) | |
6849 | { | |
6850 | symval.set_output_value(target->plt_address_for_global(gsym)); | |
6851 | psymval = &symval; | |
6852 | } | |
6853 | else if (gsym == NULL && psymval->is_ifunc_symbol()) | |
6854 | { | |
6855 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
6856 | if (object->local_has_plt_offset(r_sym)) | |
6857 | { | |
6858 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); | |
6859 | psymval = &symval; | |
6860 | } | |
6861 | } | |
6862 | ||
6863 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
6864 | ||
6865 | // Get the GOT offset if needed. | |
6866 | // For aarch64, the GOT pointer points to the start of the GOT section. | |
6867 | bool have_got_offset = false; | |
6868 | int got_offset = 0; | |
6869 | int got_base = (target->got_ != NULL | |
6870 | ? (target->got_->current_data_size() >= 0x8000 | |
6871 | ? 0x8000 : 0) | |
6872 | : 0); | |
6873 | switch (r_type) | |
6874 | { | |
6875 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G0: | |
6876 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC: | |
6877 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G1: | |
6878 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC: | |
6879 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G2: | |
6880 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC: | |
6881 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G3: | |
6882 | case elfcpp::R_AARCH64_GOTREL64: | |
6883 | case elfcpp::R_AARCH64_GOTREL32: | |
6884 | case elfcpp::R_AARCH64_GOT_LD_PREL19: | |
6885 | case elfcpp::R_AARCH64_LD64_GOTOFF_LO15: | |
6886 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: | |
6887 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: | |
6888 | case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15: | |
6889 | if (gsym != NULL) | |
6890 | { | |
6891 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
6892 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - got_base; | |
6893 | } | |
6894 | else | |
6895 | { | |
6896 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
6897 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
6898 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
6899 | - got_base); | |
6900 | } | |
6901 | have_got_offset = true; | |
6902 | break; | |
8e33481e | 6903 | |
9363c7c3 JY |
6904 | default: |
6905 | break; | |
6906 | } | |
6907 | ||
6908 | typename Reloc::Status reloc_status = Reloc::STATUS_OKAY; | |
6909 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
6910 | switch (r_type) | |
6911 | { | |
6912 | case elfcpp::R_AARCH64_NONE: | |
6913 | break; | |
6914 | ||
6915 | case elfcpp::R_AARCH64_ABS64: | |
0eccf19f CC |
6916 | if (!parameters->options().apply_dynamic_relocs() |
6917 | && parameters->options().output_is_position_independent() | |
6918 | && gsym != NULL | |
6919 | && gsym->needs_dynamic_reloc(reloc_property->reference_flags()) | |
6920 | && !gsym->can_use_relative_reloc(false)) | |
6921 | // We have generated an absolute dynamic relocation, so do not | |
6922 | // apply the relocation statically. (Works around bugs in older | |
6923 | // Android dynamic linkers.) | |
6924 | break; | |
9363c7c3 JY |
6925 | reloc_status = Reloc::template rela_ua<64>( |
6926 | view, object, psymval, addend, reloc_property); | |
6927 | break; | |
6928 | ||
6929 | case elfcpp::R_AARCH64_ABS32: | |
0eccf19f CC |
6930 | if (!parameters->options().apply_dynamic_relocs() |
6931 | && parameters->options().output_is_position_independent() | |
6932 | && gsym != NULL | |
6933 | && gsym->needs_dynamic_reloc(reloc_property->reference_flags())) | |
6934 | // We have generated an absolute dynamic relocation, so do not | |
6935 | // apply the relocation statically. (Works around bugs in older | |
6936 | // Android dynamic linkers.) | |
6937 | break; | |
9363c7c3 JY |
6938 | reloc_status = Reloc::template rela_ua<32>( |
6939 | view, object, psymval, addend, reloc_property); | |
6940 | break; | |
6941 | ||
6942 | case elfcpp::R_AARCH64_ABS16: | |
0eccf19f CC |
6943 | if (!parameters->options().apply_dynamic_relocs() |
6944 | && parameters->options().output_is_position_independent() | |
6945 | && gsym != NULL | |
6946 | && gsym->needs_dynamic_reloc(reloc_property->reference_flags())) | |
6947 | // We have generated an absolute dynamic relocation, so do not | |
6948 | // apply the relocation statically. (Works around bugs in older | |
6949 | // Android dynamic linkers.) | |
6950 | break; | |
9363c7c3 JY |
6951 | reloc_status = Reloc::template rela_ua<16>( |
6952 | view, object, psymval, addend, reloc_property); | |
6953 | break; | |
6954 | ||
6955 | case elfcpp::R_AARCH64_PREL64: | |
6956 | reloc_status = Reloc::template pcrela_ua<64>( | |
6957 | view, object, psymval, addend, address, reloc_property); | |
83a01957 | 6958 | break; |
9363c7c3 JY |
6959 | |
6960 | case elfcpp::R_AARCH64_PREL32: | |
6961 | reloc_status = Reloc::template pcrela_ua<32>( | |
6962 | view, object, psymval, addend, address, reloc_property); | |
83a01957 | 6963 | break; |
9363c7c3 JY |
6964 | |
6965 | case elfcpp::R_AARCH64_PREL16: | |
6966 | reloc_status = Reloc::template pcrela_ua<16>( | |
6967 | view, object, psymval, addend, address, reloc_property); | |
83a01957 | 6968 | break; |
9363c7c3 | 6969 | |
9726c3c1 HS |
6970 | case elfcpp::R_AARCH64_LD_PREL_LO19: |
6971 | reloc_status = Reloc::template pcrela_general<32>( | |
6972 | view, object, psymval, addend, address, reloc_property); | |
6973 | break; | |
6974 | ||
6975 | case elfcpp::R_AARCH64_ADR_PREL_LO21: | |
6976 | reloc_status = Reloc::adr(view, object, psymval, addend, | |
6977 | address, reloc_property); | |
6978 | break; | |
6979 | ||
9363c7c3 JY |
6980 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: |
6981 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: | |
6982 | reloc_status = Reloc::adrp(view, object, psymval, addend, address, | |
6983 | reloc_property); | |
6984 | break; | |
6985 | ||
6986 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: | |
6987 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: | |
6988 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: | |
6989 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: | |
6990 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: | |
6991 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: | |
6992 | reloc_status = Reloc::template rela_general<32>( | |
6993 | view, object, psymval, addend, reloc_property); | |
6994 | break; | |
6995 | ||
3a531937 JY |
6996 | case elfcpp::R_AARCH64_CALL26: |
6997 | if (this->skip_call_tls_get_addr_) | |
6998 | { | |
6999 | // Double check that the TLSGD insn has been optimized away. | |
7000 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
7001 | Insntype insn = elfcpp::Swap<32, big_endian>::readval( | |
7002 | reinterpret_cast<Insntype*>(view)); | |
7003 | gold_assert((insn & 0xff000000) == 0x91000000); | |
7004 | ||
7005 | reloc_status = Reloc::STATUS_OKAY; | |
7006 | this->skip_call_tls_get_addr_ = false; | |
7007 | // Return false to stop further processing this reloc. | |
7008 | return false; | |
7009 | } | |
83a01957 HS |
7010 | // Fallthrough |
7011 | case elfcpp::R_AARCH64_JUMP26: | |
7012 | if (Reloc::maybe_apply_stub(r_type, relinfo, rela, view, address, | |
0bf32ea9 JY |
7013 | gsym, psymval, object, |
7014 | target->stub_group_size_)) | |
83a01957 HS |
7015 | break; |
7016 | // Fallthrough | |
8e33481e HS |
7017 | case elfcpp::R_AARCH64_TSTBR14: |
7018 | case elfcpp::R_AARCH64_CONDBR19: | |
9363c7c3 JY |
7019 | reloc_status = Reloc::template pcrela_general<32>( |
7020 | view, object, psymval, addend, address, reloc_property); | |
7021 | break; | |
7022 | ||
7023 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: | |
7024 | gold_assert(have_got_offset); | |
7025 | value = target->got_->address() + got_base + got_offset; | |
7026 | reloc_status = Reloc::adrp(view, value + addend, address); | |
7027 | break; | |
7028 | ||
7029 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: | |
7030 | gold_assert(have_got_offset); | |
7031 | value = target->got_->address() + got_base + got_offset; | |
7032 | reloc_status = Reloc::template rela_general<32>( | |
7033 | view, value, addend, reloc_property); | |
7034 | break; | |
7035 | ||
3a531937 JY |
7036 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
7037 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: | |
9726c3c1 HS |
7038 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
7039 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: | |
7040 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
7041 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: | |
6b0ad2eb JY |
7042 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
7043 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: | |
8e33481e HS |
7044 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
7045 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: | |
1a920511 JY |
7046 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
7047 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
7048 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: | |
7049 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
7050 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: | |
8e33481e HS |
7051 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
7052 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: | |
7053 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: | |
3a531937 JY |
7054 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
7055 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
7056 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
7057 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
8e33481e HS |
7058 | reloc_status = relocate_tls(relinfo, target, relnum, rela, r_type, |
7059 | gsym, psymval, view, address); | |
7060 | break; | |
7061 | ||
3a531937 JY |
7062 | // These are dynamic relocations, which are unexpected when linking. |
7063 | case elfcpp::R_AARCH64_COPY: | |
7064 | case elfcpp::R_AARCH64_GLOB_DAT: | |
7065 | case elfcpp::R_AARCH64_JUMP_SLOT: | |
7066 | case elfcpp::R_AARCH64_RELATIVE: | |
7067 | case elfcpp::R_AARCH64_IRELATIVE: | |
7068 | case elfcpp::R_AARCH64_TLS_DTPREL64: | |
7069 | case elfcpp::R_AARCH64_TLS_DTPMOD64: | |
7070 | case elfcpp::R_AARCH64_TLS_TPREL64: | |
7071 | case elfcpp::R_AARCH64_TLSDESC: | |
9363c7c3 | 7072 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3a531937 | 7073 | _("unexpected reloc %u in object file"), |
9363c7c3 JY |
7074 | r_type); |
7075 | break; | |
3a531937 JY |
7076 | |
7077 | default: | |
7078 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
7079 | _("unsupported reloc %s"), | |
7080 | reloc_property->name().c_str()); | |
7081 | break; | |
9363c7c3 JY |
7082 | } |
7083 | ||
7084 | // Report any errors. | |
7085 | switch (reloc_status) | |
7086 | { | |
7087 | case Reloc::STATUS_OKAY: | |
7088 | break; | |
7089 | case Reloc::STATUS_OVERFLOW: | |
7090 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
7091 | _("relocation overflow in %s"), | |
7092 | reloc_property->name().c_str()); | |
7093 | break; | |
7094 | case Reloc::STATUS_BAD_RELOC: | |
7095 | gold_error_at_location( | |
7096 | relinfo, | |
7097 | relnum, | |
7098 | rela.get_r_offset(), | |
7099 | _("unexpected opcode while processing relocation %s"), | |
7100 | reloc_property->name().c_str()); | |
7101 | break; | |
7102 | default: | |
7103 | gold_unreachable(); | |
7104 | } | |
7105 | ||
053a4d68 JY |
7106 | return true; |
7107 | } | |
7108 | ||
3a531937 | 7109 | |
8e33481e HS |
7110 | template<int size, bool big_endian> |
7111 | inline | |
83a01957 | 7112 | typename AArch64_relocate_functions<size, big_endian>::Status |
8e33481e | 7113 | Target_aarch64<size, big_endian>::Relocate::relocate_tls( |
83a01957 | 7114 | const Relocate_info<size, big_endian>* relinfo, |
3a531937 JY |
7115 | Target_aarch64<size, big_endian>* target, |
7116 | size_t relnum, | |
7117 | const elfcpp::Rela<size, big_endian>& rela, | |
7118 | unsigned int r_type, const Sized_symbol<size>* gsym, | |
7119 | const Symbol_value<size>* psymval, | |
7120 | unsigned char* view, | |
8e33481e HS |
7121 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
7122 | { | |
83a01957 | 7123 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
3a531937 | 7124 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
8e33481e | 7125 | |
3a531937 JY |
7126 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7127 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
7128 | const AArch64_reloc_property* reloc_property = | |
7129 | aarch64_reloc_property_table->get_reloc_property(r_type); | |
8e33481e HS |
7130 | gold_assert(reloc_property != NULL); |
7131 | ||
3a531937 JY |
7132 | const bool is_final = (gsym == NULL |
7133 | ? !parameters->options().shared() | |
7134 | : gsym->final_value_is_known()); | |
7135 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
7136 | optimize_tls_reloc(is_final, r_type); | |
7137 | ||
83a01957 | 7138 | Sized_relobj_file<size, big_endian>* object = relinfo->object; |
3a531937 | 7139 | int tls_got_offset_type; |
8e33481e HS |
7140 | switch (r_type) |
7141 | { | |
3a531937 JY |
7142 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
7143 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // Global-dynamic | |
7144 | { | |
7145 | if (tlsopt == tls::TLSOPT_TO_LE) | |
7146 | { | |
7147 | if (tls_segment == NULL) | |
7148 | { | |
7149 | gold_assert(parameters->errors()->error_count() > 0 | |
7150 | || issue_undefined_symbol_error(gsym)); | |
7151 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
7152 | } | |
7153 | return tls_gd_to_le(relinfo, target, rela, r_type, view, | |
7154 | psymval); | |
7155 | } | |
7156 | else if (tlsopt == tls::TLSOPT_NONE) | |
7157 | { | |
7158 | tls_got_offset_type = GOT_TYPE_TLS_PAIR; | |
7159 | // Firstly get the address for the got entry. | |
7160 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; | |
7161 | if (gsym != NULL) | |
7162 | { | |
7163 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); | |
7164 | got_entry_address = target->got_->address() + | |
7165 | gsym->got_offset(tls_got_offset_type); | |
7166 | } | |
7167 | else | |
7168 | { | |
7169 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
7170 | gold_assert( | |
7171 | object->local_has_got_offset(r_sym, tls_got_offset_type)); | |
7172 | got_entry_address = target->got_->address() + | |
7173 | object->local_got_offset(r_sym, tls_got_offset_type); | |
7174 | } | |
7175 | ||
7176 | // Relocate the address into adrp/ld, adrp/add pair. | |
7177 | switch (r_type) | |
7178 | { | |
7179 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: | |
7180 | return aarch64_reloc_funcs::adrp( | |
7181 | view, got_entry_address + addend, address); | |
7182 | ||
7183 | break; | |
7184 | ||
7185 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: | |
7186 | return aarch64_reloc_funcs::template rela_general<32>( | |
7187 | view, got_entry_address, addend, reloc_property); | |
7188 | break; | |
7189 | ||
7190 | default: | |
9726c3c1 | 7191 | gold_unreachable(); |
3a531937 JY |
7192 | } |
7193 | } | |
7194 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
7195 | _("unsupported gd_to_ie relaxation on %u"), | |
7196 | r_type); | |
7197 | } | |
7198 | break; | |
7199 | ||
9726c3c1 HS |
7200 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
7201 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local-dynamic | |
7202 | { | |
7203 | if (tlsopt == tls::TLSOPT_TO_LE) | |
7204 | { | |
7205 | if (tls_segment == NULL) | |
7206 | { | |
7207 | gold_assert(parameters->errors()->error_count() > 0 | |
7208 | || issue_undefined_symbol_error(gsym)); | |
7209 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
7210 | } | |
7211 | return this->tls_ld_to_le(relinfo, target, rela, r_type, view, | |
7212 | psymval); | |
7213 | } | |
7214 | ||
7215 | gold_assert(tlsopt == tls::TLSOPT_NONE); | |
7216 | // Relocate the field with the offset of the GOT entry for | |
7217 | // the module index. | |
7218 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; | |
7219 | got_entry_address = (target->got_mod_index_entry(NULL, NULL, NULL) + | |
7220 | target->got_->address()); | |
7221 | ||
7222 | switch (r_type) | |
7223 | { | |
7224 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: | |
7225 | return aarch64_reloc_funcs::adrp( | |
7226 | view, got_entry_address + addend, address); | |
7227 | break; | |
7228 | ||
7229 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: | |
7230 | return aarch64_reloc_funcs::template rela_general<32>( | |
7231 | view, got_entry_address, addend, reloc_property); | |
7232 | break; | |
7233 | ||
7234 | default: | |
7235 | gold_unreachable(); | |
7236 | } | |
7237 | } | |
7238 | break; | |
7239 | ||
7240 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
6b0ad2eb JY |
7241 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
7242 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: | |
7243 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local-dynamic | |
9726c3c1 HS |
7244 | { |
7245 | AArch64_address value = psymval->value(object, 0); | |
7246 | if (tlsopt == tls::TLSOPT_TO_LE) | |
7247 | { | |
7248 | if (tls_segment == NULL) | |
7249 | { | |
7250 | gold_assert(parameters->errors()->error_count() > 0 | |
7251 | || issue_undefined_symbol_error(gsym)); | |
7252 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
7253 | } | |
9726c3c1 HS |
7254 | } |
7255 | switch (r_type) | |
7256 | { | |
7257 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
7258 | return aarch64_reloc_funcs::movnz(view, value + addend, | |
7259 | reloc_property); | |
7260 | break; | |
7261 | ||
7262 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: | |
6b0ad2eb JY |
7263 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
7264 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: | |
9726c3c1 HS |
7265 | return aarch64_reloc_funcs::template rela_general<32>( |
7266 | view, value, addend, reloc_property); | |
7267 | break; | |
7268 | ||
7269 | default: | |
7270 | gold_unreachable(); | |
7271 | } | |
7272 | // We should never reach here. | |
7273 | } | |
7274 | break; | |
7275 | ||
8e33481e | 7276 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
3a531937 | 7277 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial-exec |
8e33481e | 7278 | { |
3a531937 JY |
7279 | if (tlsopt == tls::TLSOPT_TO_LE) |
7280 | { | |
7281 | if (tls_segment == NULL) | |
7282 | { | |
7283 | gold_assert(parameters->errors()->error_count() > 0 | |
7284 | || issue_undefined_symbol_error(gsym)); | |
7285 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
7286 | } | |
7287 | return tls_ie_to_le(relinfo, target, rela, r_type, view, | |
7288 | psymval); | |
7289 | } | |
7290 | tls_got_offset_type = GOT_TYPE_TLS_OFFSET; | |
7291 | ||
7292 | // Firstly get the address for the got entry. | |
8e33481e HS |
7293 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
7294 | if (gsym != NULL) | |
7295 | { | |
3a531937 | 7296 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
8e33481e | 7297 | got_entry_address = target->got_->address() + |
3a531937 | 7298 | gsym->got_offset(tls_got_offset_type); |
8e33481e HS |
7299 | } |
7300 | else | |
7301 | { | |
7302 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
7303 | gold_assert( | |
3a531937 | 7304 | object->local_has_got_offset(r_sym, tls_got_offset_type)); |
8e33481e | 7305 | got_entry_address = target->got_->address() + |
3a531937 | 7306 | object->local_got_offset(r_sym, tls_got_offset_type); |
8e33481e | 7307 | } |
3a531937 JY |
7308 | // Relocate the address into adrp/ld, adrp/add pair. |
7309 | switch (r_type) | |
8e33481e | 7310 | { |
3a531937 JY |
7311 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
7312 | return aarch64_reloc_funcs::adrp(view, got_entry_address + addend, | |
7313 | address); | |
7314 | break; | |
7315 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: | |
7316 | return aarch64_reloc_funcs::template rela_general<32>( | |
7317 | view, got_entry_address, addend, reloc_property); | |
7318 | default: | |
9726c3c1 | 7319 | gold_unreachable(); |
8e33481e | 7320 | } |
8e33481e | 7321 | } |
3a531937 | 7322 | // We shall never reach here. |
8e33481e HS |
7323 | break; |
7324 | ||
1a920511 JY |
7325 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
7326 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
7327 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: | |
7328 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
7329 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: | |
8e33481e HS |
7330 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
7331 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: | |
7332 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: | |
7333 | { | |
8e33481e | 7334 | gold_assert(tls_segment != NULL); |
3a531937 | 7335 | AArch64_address value = psymval->value(object, 0); |
8e33481e HS |
7336 | |
7337 | if (!parameters->options().shared()) | |
7338 | { | |
3a531937 JY |
7339 | AArch64_address aligned_tcb_size = |
7340 | align_address(target->tcb_size(), | |
7341 | tls_segment->maximum_alignment()); | |
1a920511 JY |
7342 | value += aligned_tcb_size; |
7343 | switch (r_type) | |
7344 | { | |
7345 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: | |
7346 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
7347 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
7348 | return aarch64_reloc_funcs::movnz(view, value + addend, | |
7349 | reloc_property); | |
7350 | default: | |
7351 | return aarch64_reloc_funcs::template | |
7352 | rela_general<32>(view, | |
7353 | value, | |
7354 | addend, | |
7355 | reloc_property); | |
7356 | } | |
8e33481e HS |
7357 | } |
7358 | else | |
7359 | gold_error(_("%s: unsupported reloc %u " | |
7360 | "in non-static TLSLE mode."), | |
7361 | object->name().c_str(), r_type); | |
7362 | } | |
7363 | break; | |
7364 | ||
3a531937 JY |
7365 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
7366 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
7367 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
7368 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
7369 | { | |
7370 | if (tlsopt == tls::TLSOPT_TO_LE) | |
7371 | { | |
7372 | if (tls_segment == NULL) | |
7373 | { | |
7374 | gold_assert(parameters->errors()->error_count() > 0 | |
7375 | || issue_undefined_symbol_error(gsym)); | |
7376 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
7377 | } | |
7378 | return tls_desc_gd_to_le(relinfo, target, rela, r_type, | |
7379 | view, psymval); | |
7380 | } | |
7381 | else | |
7382 | { | |
7383 | tls_got_offset_type = (tlsopt == tls::TLSOPT_TO_IE | |
7384 | ? GOT_TYPE_TLS_OFFSET | |
7385 | : GOT_TYPE_TLS_DESC); | |
7386 | unsigned int got_tlsdesc_offset = 0; | |
7387 | if (r_type != elfcpp::R_AARCH64_TLSDESC_CALL | |
7388 | && tlsopt == tls::TLSOPT_NONE) | |
7389 | { | |
7390 | // We created GOT entries in the .got.tlsdesc portion of the | |
7391 | // .got.plt section, but the offset stored in the symbol is the | |
7392 | // offset within .got.tlsdesc. | |
7393 | got_tlsdesc_offset = (target->got_->data_size() | |
7394 | + target->got_plt_section()->data_size()); | |
7395 | } | |
7396 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; | |
7397 | if (gsym != NULL) | |
7398 | { | |
7399 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); | |
7400 | got_entry_address = target->got_->address() | |
7401 | + got_tlsdesc_offset | |
7402 | + gsym->got_offset(tls_got_offset_type); | |
7403 | } | |
7404 | else | |
7405 | { | |
7406 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
7407 | gold_assert( | |
7408 | object->local_has_got_offset(r_sym, tls_got_offset_type)); | |
7409 | got_entry_address = target->got_->address() + | |
7410 | got_tlsdesc_offset + | |
7411 | object->local_got_offset(r_sym, tls_got_offset_type); | |
7412 | } | |
7413 | if (tlsopt == tls::TLSOPT_TO_IE) | |
7414 | { | |
7415 | if (tls_segment == NULL) | |
7416 | { | |
7417 | gold_assert(parameters->errors()->error_count() > 0 | |
7418 | || issue_undefined_symbol_error(gsym)); | |
7419 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
7420 | } | |
7421 | return tls_desc_gd_to_ie(relinfo, target, rela, r_type, | |
7422 | view, psymval, got_entry_address, | |
7423 | address); | |
7424 | } | |
7425 | ||
7426 | // Now do tlsdesc relocation. | |
7427 | switch (r_type) | |
7428 | { | |
7429 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: | |
7430 | return aarch64_reloc_funcs::adrp(view, | |
7431 | got_entry_address + addend, | |
7432 | address); | |
7433 | break; | |
7434 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
7435 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
7436 | return aarch64_reloc_funcs::template rela_general<32>( | |
7437 | view, got_entry_address, addend, reloc_property); | |
7438 | break; | |
7439 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
7440 | return aarch64_reloc_funcs::STATUS_OKAY; | |
7441 | break; | |
7442 | default: | |
7443 | gold_unreachable(); | |
7444 | } | |
7445 | } | |
7446 | } | |
7447 | break; | |
7448 | ||
8e33481e HS |
7449 | default: |
7450 | gold_error(_("%s: unsupported TLS reloc %u."), | |
7451 | object->name().c_str(), r_type); | |
7452 | } | |
7453 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
3a531937 JY |
7454 | } // End of relocate_tls. |
7455 | ||
7456 | ||
7457 | template<int size, bool big_endian> | |
7458 | inline | |
83a01957 | 7459 | typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 7460 | Target_aarch64<size, big_endian>::Relocate::tls_gd_to_le( |
83a01957 | 7461 | const Relocate_info<size, big_endian>* relinfo, |
3a531937 JY |
7462 | Target_aarch64<size, big_endian>* target, |
7463 | const elfcpp::Rela<size, big_endian>& rela, | |
7464 | unsigned int r_type, | |
7465 | unsigned char* view, | |
7466 | const Symbol_value<size>* psymval) | |
7467 | { | |
83a01957 | 7468 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
3a531937 JY |
7469 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
7470 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
7471 | ||
7472 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
7473 | Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip); | |
7474 | Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1); | |
7475 | Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2); | |
7476 | ||
7477 | if (r_type == elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC) | |
7478 | { | |
7479 | // This is the 2nd relocs, optimization should already have been | |
7480 | // done. | |
7481 | gold_assert((insn1 & 0xfff00000) == 0x91400000); | |
7482 | return aarch64_reloc_funcs::STATUS_OKAY; | |
7483 | } | |
7484 | ||
7485 | // The original sequence is - | |
7486 | // 90000000 adrp x0, 0 <main> | |
7487 | // 91000000 add x0, x0, #0x0 | |
7488 | // 94000000 bl 0 <__tls_get_addr> | |
7489 | // optimized to sequence - | |
7490 | // d53bd040 mrs x0, tpidr_el0 | |
7491 | // 91400000 add x0, x0, #0x0, lsl #12 | |
7492 | // 91000000 add x0, x0, #0x0 | |
7493 | ||
7494 | // Unlike tls_ie_to_le, we change the 3 insns in one function call when we | |
7495 | // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we | |
7496 | // have to change "bl tls_get_addr", which does not have a corresponding tls | |
7497 | // relocation type. So before proceeding, we need to make sure compiler | |
7498 | // does not change the sequence. | |
7499 | if(!(insn1 == 0x90000000 // adrp x0,0 | |
7500 | && insn2 == 0x91000000 // add x0, x0, #0x0 | |
7501 | && insn3 == 0x94000000)) // bl 0 | |
7502 | { | |
7503 | // Ideally we should give up gd_to_le relaxation and do gd access. | |
7504 | // However the gd_to_le relaxation decision has been made early | |
7505 | // in the scan stage, where we did not allocate any GOT entry for | |
7506 | // this symbol. Therefore we have to exit and report error now. | |
7507 | gold_error(_("unexpected reloc insn sequence while relaxing " | |
7508 | "tls gd to le for reloc %u."), r_type); | |
7509 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
7510 | } | |
7511 | ||
7512 | // Write new insns. | |
7513 | insn1 = 0xd53bd040; // mrs x0, tpidr_el0 | |
7514 | insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12 | |
7515 | insn3 = 0x91000000; // add x0, x0, #0x0 | |
7516 | elfcpp::Swap<32, big_endian>::writeval(ip, insn1); | |
7517 | elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2); | |
7518 | elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3); | |
7519 | ||
7520 | // Calculate tprel value. | |
7521 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
7522 | gold_assert(tls_segment != NULL); | |
7523 | AArch64_address value = psymval->value(relinfo->object, 0); | |
7524 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
7525 | AArch64_address aligned_tcb_size = | |
7526 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); | |
7527 | AArch64_address x = value + aligned_tcb_size; | |
7528 | ||
7529 | // After new insns are written, apply TLSLE relocs. | |
7530 | const AArch64_reloc_property* rp1 = | |
7531 | aarch64_reloc_property_table->get_reloc_property( | |
7532 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12); | |
7533 | const AArch64_reloc_property* rp2 = | |
7534 | aarch64_reloc_property_table->get_reloc_property( | |
7535 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12); | |
7536 | gold_assert(rp1 != NULL && rp2 != NULL); | |
7537 | ||
7538 | typename aarch64_reloc_funcs::Status s1 = | |
7539 | aarch64_reloc_funcs::template rela_general<32>(view + 4, | |
7540 | x, | |
7541 | addend, | |
7542 | rp1); | |
7543 | if (s1 != aarch64_reloc_funcs::STATUS_OKAY) | |
7544 | return s1; | |
7545 | ||
7546 | typename aarch64_reloc_funcs::Status s2 = | |
7547 | aarch64_reloc_funcs::template rela_general<32>(view + 8, | |
7548 | x, | |
7549 | addend, | |
7550 | rp2); | |
7551 | ||
7552 | this->skip_call_tls_get_addr_ = true; | |
7553 | return s2; | |
7554 | } // End of tls_gd_to_le | |
7555 | ||
7556 | ||
9726c3c1 HS |
7557 | template<int size, bool big_endian> |
7558 | inline | |
7559 | typename AArch64_relocate_functions<size, big_endian>::Status | |
7560 | Target_aarch64<size, big_endian>::Relocate::tls_ld_to_le( | |
7561 | const Relocate_info<size, big_endian>* relinfo, | |
7562 | Target_aarch64<size, big_endian>* target, | |
7563 | const elfcpp::Rela<size, big_endian>& rela, | |
7564 | unsigned int r_type, | |
7565 | unsigned char* view, | |
7566 | const Symbol_value<size>* psymval) | |
7567 | { | |
7568 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; | |
7569 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
7570 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
7571 | ||
7572 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
7573 | Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip); | |
7574 | Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1); | |
7575 | Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2); | |
7576 | ||
7577 | if (r_type == elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC) | |
7578 | { | |
7579 | // This is the 2nd relocs, optimization should already have been | |
7580 | // done. | |
7581 | gold_assert((insn1 & 0xfff00000) == 0x91400000); | |
7582 | return aarch64_reloc_funcs::STATUS_OKAY; | |
7583 | } | |
7584 | ||
7585 | // The original sequence is - | |
7586 | // 90000000 adrp x0, 0 <main> | |
7587 | // 91000000 add x0, x0, #0x0 | |
7588 | // 94000000 bl 0 <__tls_get_addr> | |
7589 | // optimized to sequence - | |
7590 | // d53bd040 mrs x0, tpidr_el0 | |
7591 | // 91400000 add x0, x0, #0x0, lsl #12 | |
7592 | // 91000000 add x0, x0, #0x0 | |
7593 | ||
7594 | // Unlike tls_ie_to_le, we change the 3 insns in one function call when we | |
7595 | // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we | |
7596 | // have to change "bl tls_get_addr", which does not have a corresponding tls | |
7597 | // relocation type. So before proceeding, we need to make sure compiler | |
7598 | // does not change the sequence. | |
7599 | if(!(insn1 == 0x90000000 // adrp x0,0 | |
7600 | && insn2 == 0x91000000 // add x0, x0, #0x0 | |
7601 | && insn3 == 0x94000000)) // bl 0 | |
7602 | { | |
7603 | // Ideally we should give up gd_to_le relaxation and do gd access. | |
7604 | // However the gd_to_le relaxation decision has been made early | |
7605 | // in the scan stage, where we did not allocate any GOT entry for | |
7606 | // this symbol. Therefore we have to exit and report error now. | |
7607 | gold_error(_("unexpected reloc insn sequence while relaxing " | |
7608 | "tls gd to le for reloc %u."), r_type); | |
7609 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
7610 | } | |
7611 | ||
7612 | // Write new insns. | |
7613 | insn1 = 0xd53bd040; // mrs x0, tpidr_el0 | |
7614 | insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12 | |
7615 | insn3 = 0x91000000; // add x0, x0, #0x0 | |
7616 | elfcpp::Swap<32, big_endian>::writeval(ip, insn1); | |
7617 | elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2); | |
7618 | elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3); | |
7619 | ||
7620 | // Calculate tprel value. | |
7621 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
7622 | gold_assert(tls_segment != NULL); | |
7623 | AArch64_address value = psymval->value(relinfo->object, 0); | |
7624 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
7625 | AArch64_address aligned_tcb_size = | |
7626 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); | |
7627 | AArch64_address x = value + aligned_tcb_size; | |
7628 | ||
7629 | // After new insns are written, apply TLSLE relocs. | |
7630 | const AArch64_reloc_property* rp1 = | |
7631 | aarch64_reloc_property_table->get_reloc_property( | |
7632 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12); | |
7633 | const AArch64_reloc_property* rp2 = | |
7634 | aarch64_reloc_property_table->get_reloc_property( | |
7635 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12); | |
7636 | gold_assert(rp1 != NULL && rp2 != NULL); | |
7637 | ||
7638 | typename aarch64_reloc_funcs::Status s1 = | |
7639 | aarch64_reloc_funcs::template rela_general<32>(view + 4, | |
7640 | x, | |
7641 | addend, | |
7642 | rp1); | |
7643 | if (s1 != aarch64_reloc_funcs::STATUS_OKAY) | |
7644 | return s1; | |
7645 | ||
7646 | typename aarch64_reloc_funcs::Status s2 = | |
7647 | aarch64_reloc_funcs::template rela_general<32>(view + 8, | |
7648 | x, | |
7649 | addend, | |
7650 | rp2); | |
7651 | ||
7652 | this->skip_call_tls_get_addr_ = true; | |
7653 | return s2; | |
7654 | ||
7655 | } // End of tls_ld_to_le | |
7656 | ||
3a531937 JY |
7657 | template<int size, bool big_endian> |
7658 | inline | |
83a01957 | 7659 | typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 7660 | Target_aarch64<size, big_endian>::Relocate::tls_ie_to_le( |
83a01957 | 7661 | const Relocate_info<size, big_endian>* relinfo, |
3a531937 JY |
7662 | Target_aarch64<size, big_endian>* target, |
7663 | const elfcpp::Rela<size, big_endian>& rela, | |
7664 | unsigned int r_type, | |
7665 | unsigned char* view, | |
7666 | const Symbol_value<size>* psymval) | |
7667 | { | |
7668 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
7669 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
83a01957 | 7670 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
3a531937 JY |
7671 | |
7672 | AArch64_address value = psymval->value(relinfo->object, 0); | |
7673 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
7674 | AArch64_address aligned_tcb_address = | |
7675 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); | |
7676 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
7677 | AArch64_address x = value + addend + aligned_tcb_address; | |
7678 | // "x" is the offset to tp, we can only do this if x is within | |
7679 | // range [0, 2^32-1] | |
7680 | if (!(size == 32 || (size == 64 && (static_cast<uint64_t>(x) >> 32) == 0))) | |
7681 | { | |
7682 | gold_error(_("TLS variable referred by reloc %u is too far from TP."), | |
7683 | r_type); | |
7684 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
7685 | } | |
7686 | ||
7687 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
7688 | Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip); | |
7689 | unsigned int regno; | |
7690 | Insntype newinsn; | |
7691 | if (r_type == elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21) | |
7692 | { | |
7693 | // Generate movz. | |
7694 | regno = (insn & 0x1f); | |
7695 | newinsn = (0xd2a00000 | regno) | (((x >> 16) & 0xffff) << 5); | |
7696 | } | |
7697 | else if (r_type == elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC) | |
7698 | { | |
7699 | // Generate movk. | |
7700 | regno = (insn & 0x1f); | |
7701 | gold_assert(regno == ((insn >> 5) & 0x1f)); | |
7702 | newinsn = (0xf2800000 | regno) | ((x & 0xffff) << 5); | |
7703 | } | |
7704 | else | |
9726c3c1 | 7705 | gold_unreachable(); |
3a531937 JY |
7706 | |
7707 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); | |
7708 | return aarch64_reloc_funcs::STATUS_OKAY; | |
7709 | } // End of tls_ie_to_le | |
7710 | ||
7711 | ||
7712 | template<int size, bool big_endian> | |
7713 | inline | |
83a01957 | 7714 | typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 7715 | Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_le( |
83a01957 | 7716 | const Relocate_info<size, big_endian>* relinfo, |
3a531937 JY |
7717 | Target_aarch64<size, big_endian>* target, |
7718 | const elfcpp::Rela<size, big_endian>& rela, | |
7719 | unsigned int r_type, | |
7720 | unsigned char* view, | |
7721 | const Symbol_value<size>* psymval) | |
7722 | { | |
7723 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
7724 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
83a01957 | 7725 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
3a531937 JY |
7726 | |
7727 | // TLSDESC-GD sequence is like: | |
7728 | // adrp x0, :tlsdesc:v1 | |
7729 | // ldr x1, [x0, #:tlsdesc_lo12:v1] | |
7730 | // add x0, x0, :tlsdesc_lo12:v1 | |
7731 | // .tlsdesccall v1 | |
7732 | // blr x1 | |
7733 | // After desc_gd_to_le optimization, the sequence will be like: | |
7734 | // movz x0, #0x0, lsl #16 | |
7735 | // movk x0, #0x10 | |
7736 | // nop | |
7737 | // nop | |
7738 | ||
7739 | // Calculate tprel value. | |
7740 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
7741 | gold_assert(tls_segment != NULL); | |
7742 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
7743 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
7744 | AArch64_address value = psymval->value(relinfo->object, addend); | |
7745 | AArch64_address aligned_tcb_size = | |
7746 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); | |
7747 | AArch64_address x = value + aligned_tcb_size; | |
7748 | // x is the offset to tp, we can only do this if x is within range | |
7749 | // [0, 2^32-1]. If x is out of range, fail and exit. | |
7750 | if (size == 64 && (static_cast<uint64_t>(x) >> 32) != 0) | |
7751 | { | |
7752 | gold_error(_("TLS variable referred by reloc %u is too far from TP. " | |
7753 | "We Can't do gd_to_le relaxation.\n"), r_type); | |
7754 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
7755 | } | |
7756 | Insntype newinsn; | |
7757 | switch (r_type) | |
7758 | { | |
7759 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
7760 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
7761 | // Change to nop | |
7762 | newinsn = 0xd503201f; | |
7763 | break; | |
7764 | ||
7765 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: | |
7766 | // Change to movz. | |
7767 | newinsn = 0xd2a00000 | (((x >> 16) & 0xffff) << 5); | |
7768 | break; | |
7769 | ||
7770 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
7771 | // Change to movk. | |
7772 | newinsn = 0xf2800000 | ((x & 0xffff) << 5); | |
7773 | break; | |
7774 | ||
7775 | default: | |
7776 | gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"), | |
7777 | r_type); | |
7778 | gold_unreachable(); | |
7779 | } | |
7780 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); | |
7781 | return aarch64_reloc_funcs::STATUS_OKAY; | |
7782 | } // End of tls_desc_gd_to_le | |
7783 | ||
7784 | ||
7785 | template<int size, bool big_endian> | |
7786 | inline | |
83a01957 | 7787 | typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 7788 | Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_ie( |
83a01957 | 7789 | const Relocate_info<size, big_endian>* /* relinfo */, |
3a531937 JY |
7790 | Target_aarch64<size, big_endian>* /* target */, |
7791 | const elfcpp::Rela<size, big_endian>& rela, | |
7792 | unsigned int r_type, | |
7793 | unsigned char* view, | |
7794 | const Symbol_value<size>* /* psymval */, | |
7795 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address, | |
7796 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
7797 | { | |
7798 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
83a01957 | 7799 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
3a531937 JY |
7800 | |
7801 | // TLSDESC-GD sequence is like: | |
7802 | // adrp x0, :tlsdesc:v1 | |
7803 | // ldr x1, [x0, #:tlsdesc_lo12:v1] | |
7804 | // add x0, x0, :tlsdesc_lo12:v1 | |
7805 | // .tlsdesccall v1 | |
7806 | // blr x1 | |
7807 | // After desc_gd_to_ie optimization, the sequence will be like: | |
7808 | // adrp x0, :tlsie:v1 | |
7809 | // ldr x0, [x0, :tlsie_lo12:v1] | |
7810 | // nop | |
7811 | // nop | |
7812 | ||
7813 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
7814 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
7815 | Insntype newinsn; | |
7816 | switch (r_type) | |
7817 | { | |
7818 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
7819 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
7820 | // Change to nop | |
7821 | newinsn = 0xd503201f; | |
7822 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); | |
7823 | break; | |
7824 | ||
7825 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: | |
7826 | { | |
7827 | return aarch64_reloc_funcs::adrp(view, got_entry_address + addend, | |
7828 | address); | |
7829 | } | |
7830 | break; | |
7831 | ||
7832 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
7833 | { | |
bb779192 HS |
7834 | // Set ldr target register to be x0. |
7835 | Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip); | |
7836 | insn &= 0xffffffe0; | |
7837 | elfcpp::Swap<32, big_endian>::writeval(ip, insn); | |
7838 | // Do relocation. | |
3a531937 JY |
7839 | const AArch64_reloc_property* reloc_property = |
7840 | aarch64_reloc_property_table->get_reloc_property( | |
7841 | elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC); | |
7842 | return aarch64_reloc_funcs::template rela_general<32>( | |
7843 | view, got_entry_address, addend, reloc_property); | |
7844 | } | |
7845 | break; | |
8e33481e | 7846 | |
3a531937 JY |
7847 | default: |
7848 | gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"), | |
7849 | r_type); | |
7850 | gold_unreachable(); | |
7851 | } | |
7852 | return aarch64_reloc_funcs::STATUS_OKAY; | |
7853 | } // End of tls_desc_gd_to_ie | |
8e33481e | 7854 | |
053a4d68 JY |
7855 | // Relocate section data. |
7856 | ||
7857 | template<int size, bool big_endian> | |
7858 | void | |
7859 | Target_aarch64<size, big_endian>::relocate_section( | |
9363c7c3 | 7860 | const Relocate_info<size, big_endian>* relinfo, |
053a4d68 | 7861 | unsigned int sh_type, |
9363c7c3 JY |
7862 | const unsigned char* prelocs, |
7863 | size_t reloc_count, | |
7864 | Output_section* output_section, | |
7865 | bool needs_special_offset_handling, | |
7866 | unsigned char* view, | |
7867 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
7868 | section_size_type view_size, | |
7869 | const Reloc_symbol_changes* reloc_symbol_changes) | |
053a4d68 | 7870 | { |
053a4d68 | 7871 | gold_assert(sh_type == elfcpp::SHT_RELA); |
9363c7c3 JY |
7872 | typedef typename Target_aarch64<size, big_endian>::Relocate AArch64_relocate; |
7873 | gold::relocate_section<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, | |
7874 | AArch64_relocate, gold::Default_comdat_behavior>( | |
7875 | relinfo, | |
7876 | this, | |
7877 | prelocs, | |
7878 | reloc_count, | |
7879 | output_section, | |
7880 | needs_special_offset_handling, | |
7881 | view, | |
7882 | address, | |
7883 | view_size, | |
7884 | reloc_symbol_changes); | |
053a4d68 JY |
7885 | } |
7886 | ||
7887 | // Return the size of a relocation while scanning during a relocatable | |
7888 | // link. | |
7889 | ||
7890 | template<int size, bool big_endian> | |
7891 | unsigned int | |
7892 | Target_aarch64<size, big_endian>::Relocatable_size_for_reloc:: | |
7893 | get_size_for_reloc( | |
7894 | unsigned int , | |
7895 | Relobj* ) | |
7896 | { | |
7897 | // We will never support SHT_REL relocations. | |
7898 | gold_unreachable(); | |
7899 | return 0; | |
7900 | } | |
7901 | ||
7902 | // Scan the relocs during a relocatable link. | |
7903 | ||
7904 | template<int size, bool big_endian> | |
7905 | void | |
7906 | Target_aarch64<size, big_endian>::scan_relocatable_relocs( | |
8e33481e HS |
7907 | Symbol_table* symtab, |
7908 | Layout* layout, | |
7909 | Sized_relobj_file<size, big_endian>* object, | |
7910 | unsigned int data_shndx, | |
053a4d68 | 7911 | unsigned int sh_type, |
8e33481e HS |
7912 | const unsigned char* prelocs, |
7913 | size_t reloc_count, | |
7914 | Output_section* output_section, | |
7915 | bool needs_special_offset_handling, | |
7916 | size_t local_symbol_count, | |
7917 | const unsigned char* plocal_symbols, | |
7918 | Relocatable_relocs* rr) | |
053a4d68 | 7919 | { |
053a4d68 | 7920 | gold_assert(sh_type == elfcpp::SHT_RELA); |
8e33481e HS |
7921 | |
7922 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
7923 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
7924 | ||
7925 | gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA, | |
7926 | Scan_relocatable_relocs>( | |
7927 | symtab, | |
7928 | layout, | |
7929 | object, | |
7930 | data_shndx, | |
7931 | prelocs, | |
7932 | reloc_count, | |
7933 | output_section, | |
7934 | needs_special_offset_handling, | |
7935 | local_symbol_count, | |
7936 | plocal_symbols, | |
7937 | rr); | |
053a4d68 JY |
7938 | } |
7939 | ||
7940 | // Relocate a section during a relocatable link. | |
7941 | ||
7942 | template<int size, bool big_endian> | |
7943 | void | |
7944 | Target_aarch64<size, big_endian>::relocate_relocs( | |
8e33481e | 7945 | const Relocate_info<size, big_endian>* relinfo, |
053a4d68 | 7946 | unsigned int sh_type, |
8e33481e HS |
7947 | const unsigned char* prelocs, |
7948 | size_t reloc_count, | |
7949 | Output_section* output_section, | |
7950 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, | |
8e33481e HS |
7951 | unsigned char* view, |
7952 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
7953 | section_size_type view_size, | |
7954 | unsigned char* reloc_view, | |
7955 | section_size_type reloc_view_size) | |
053a4d68 | 7956 | { |
053a4d68 | 7957 | gold_assert(sh_type == elfcpp::SHT_RELA); |
8e33481e HS |
7958 | |
7959 | gold::relocate_relocs<size, big_endian, elfcpp::SHT_RELA>( | |
7960 | relinfo, | |
7961 | prelocs, | |
7962 | reloc_count, | |
7963 | output_section, | |
7964 | offset_in_output_section, | |
8e33481e HS |
7965 | view, |
7966 | view_address, | |
7967 | view_size, | |
7968 | reloc_view, | |
7969 | reloc_view_size); | |
053a4d68 JY |
7970 | } |
7971 | ||
83a01957 | 7972 | |
5019d64a HS |
7973 | // Return whether this is a 3-insn erratum sequence. |
7974 | ||
7975 | template<int size, bool big_endian> | |
7976 | bool | |
7977 | Target_aarch64<size, big_endian>::is_erratum_843419_sequence( | |
7978 | typename elfcpp::Swap<32,big_endian>::Valtype insn1, | |
7979 | typename elfcpp::Swap<32,big_endian>::Valtype insn2, | |
7980 | typename elfcpp::Swap<32,big_endian>::Valtype insn3) | |
7981 | { | |
7982 | unsigned rt1, rt2; | |
7983 | bool load, pair; | |
7984 | ||
7985 | // The 2nd insn is a single register load or store; or register pair | |
7986 | // store. | |
7987 | if (Insn_utilities::aarch64_mem_op_p(insn2, &rt1, &rt2, &pair, &load) | |
7988 | && (!pair || (pair && !load))) | |
7989 | { | |
7990 | // The 3rd insn is a load or store instruction from the "Load/store | |
7991 | // register (unsigned immediate)" encoding class, using Rn as the | |
7992 | // base address register. | |
7993 | if (Insn_utilities::aarch64_ldst_uimm(insn3) | |
7994 | && (Insn_utilities::aarch64_rn(insn3) | |
7995 | == Insn_utilities::aarch64_rd(insn1))) | |
7996 | return true; | |
7997 | } | |
7998 | return false; | |
7999 | } | |
8000 | ||
8001 | ||
2f0c79aa HS |
8002 | // Return whether this is a 835769 sequence. |
8003 | // (Similarly implemented as in elfnn-aarch64.c.) | |
8004 | ||
8005 | template<int size, bool big_endian> | |
8006 | bool | |
8007 | Target_aarch64<size, big_endian>::is_erratum_835769_sequence( | |
8008 | typename elfcpp::Swap<32,big_endian>::Valtype insn1, | |
8009 | typename elfcpp::Swap<32,big_endian>::Valtype insn2) | |
8010 | { | |
8011 | uint32_t rt; | |
8012 | uint32_t rt2; | |
8013 | uint32_t rn; | |
8014 | uint32_t rm; | |
8015 | uint32_t ra; | |
8016 | bool pair; | |
8017 | bool load; | |
8018 | ||
8019 | if (Insn_utilities::aarch64_mlxl(insn2) | |
8020 | && Insn_utilities::aarch64_mem_op_p (insn1, &rt, &rt2, &pair, &load)) | |
8021 | { | |
8022 | /* Any SIMD memory op is independent of the subsequent MLA | |
8023 | by definition of the erratum. */ | |
8024 | if (Insn_utilities::aarch64_bit(insn1, 26)) | |
8025 | return true; | |
8026 | ||
8027 | /* If not SIMD, check for integer memory ops and MLA relationship. */ | |
8028 | rn = Insn_utilities::aarch64_rn(insn2); | |
8029 | ra = Insn_utilities::aarch64_ra(insn2); | |
8030 | rm = Insn_utilities::aarch64_rm(insn2); | |
8031 | ||
8032 | /* If this is a load and there's a true(RAW) dependency, we are safe | |
8033 | and this is not an erratum sequence. */ | |
8034 | if (load && | |
8035 | (rt == rn || rt == rm || rt == ra | |
8036 | || (pair && (rt2 == rn || rt2 == rm || rt2 == ra)))) | |
8037 | return false; | |
8038 | ||
8039 | /* We conservatively put out stubs for all other cases (including | |
8040 | writebacks). */ | |
8041 | return true; | |
8042 | } | |
8043 | ||
8044 | return false; | |
8045 | } | |
8046 | ||
8047 | ||
8048 | // Helper method to create erratum stub for ST_E_843419 and ST_E_835769. | |
8049 | ||
8050 | template<int size, bool big_endian> | |
8051 | void | |
8052 | Target_aarch64<size, big_endian>::create_erratum_stub( | |
8053 | AArch64_relobj<size, big_endian>* relobj, | |
8054 | unsigned int shndx, | |
8055 | section_size_type erratum_insn_offset, | |
8056 | Address erratum_address, | |
8057 | typename Insn_utilities::Insntype erratum_insn, | |
0ef3814f HS |
8058 | int erratum_type, |
8059 | unsigned int e843419_adrp_offset) | |
2f0c79aa HS |
8060 | { |
8061 | gold_assert(erratum_type == ST_E_843419 || erratum_type == ST_E_835769); | |
8062 | The_stub_table* stub_table = relobj->stub_table(shndx); | |
8063 | gold_assert(stub_table != NULL); | |
8064 | if (stub_table->find_erratum_stub(relobj, | |
8065 | shndx, | |
8066 | erratum_insn_offset) == NULL) | |
8067 | { | |
8068 | const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN; | |
0ef3814f HS |
8069 | The_erratum_stub* stub; |
8070 | if (erratum_type == ST_E_835769) | |
8071 | stub = new The_erratum_stub(relobj, erratum_type, shndx, | |
8072 | erratum_insn_offset); | |
8073 | else if (erratum_type == ST_E_843419) | |
8074 | stub = new E843419_stub<size, big_endian>( | |
8075 | relobj, shndx, erratum_insn_offset, e843419_adrp_offset); | |
8076 | else | |
8077 | gold_unreachable(); | |
2f0c79aa HS |
8078 | stub->set_erratum_insn(erratum_insn); |
8079 | stub->set_erratum_address(erratum_address); | |
8080 | // For erratum ST_E_843419 and ST_E_835769, the destination address is | |
8081 | // always the next insn after erratum insn. | |
8082 | stub->set_destination_address(erratum_address + BPI); | |
8083 | stub_table->add_erratum_stub(stub); | |
8084 | } | |
8085 | } | |
8086 | ||
8087 | ||
8088 | // Scan erratum for section SHNDX range [output_address + span_start, | |
8089 | // output_address + span_end). Note here we do not share the code with | |
8090 | // scan_erratum_843419_span function, because for 843419 we optimize by only | |
8091 | // scanning the last few insns of a page, whereas for 835769, we need to scan | |
8092 | // every insn. | |
8093 | ||
8094 | template<int size, bool big_endian> | |
8095 | void | |
8096 | Target_aarch64<size, big_endian>::scan_erratum_835769_span( | |
8097 | AArch64_relobj<size, big_endian>* relobj, | |
8098 | unsigned int shndx, | |
8099 | const section_size_type span_start, | |
8100 | const section_size_type span_end, | |
8101 | unsigned char* input_view, | |
8102 | Address output_address) | |
8103 | { | |
8104 | typedef typename Insn_utilities::Insntype Insntype; | |
8105 | ||
8106 | const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN; | |
8107 | ||
8108 | // Adjust output_address and view to the start of span. | |
8109 | output_address += span_start; | |
8110 | input_view += span_start; | |
8111 | ||
8112 | section_size_type span_length = span_end - span_start; | |
8113 | section_size_type offset = 0; | |
8114 | for (offset = 0; offset + BPI < span_length; offset += BPI) | |
8115 | { | |
8116 | Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset); | |
8117 | Insntype insn1 = ip[0]; | |
8118 | Insntype insn2 = ip[1]; | |
8119 | if (is_erratum_835769_sequence(insn1, insn2)) | |
8120 | { | |
8121 | Insntype erratum_insn = insn2; | |
8122 | // "span_start + offset" is the offset for insn1. So for insn2, it is | |
8123 | // "span_start + offset + BPI". | |
8124 | section_size_type erratum_insn_offset = span_start + offset + BPI; | |
8125 | Address erratum_address = output_address + offset + BPI; | |
73854cdd | 8126 | gold_info(_("Erratum 835769 found and fixed at \"%s\", " |
2f0c79aa HS |
8127 | "section %d, offset 0x%08x."), |
8128 | relobj->name().c_str(), shndx, | |
8129 | (unsigned int)(span_start + offset)); | |
8130 | ||
8131 | this->create_erratum_stub(relobj, shndx, | |
8132 | erratum_insn_offset, erratum_address, | |
8133 | erratum_insn, ST_E_835769); | |
8134 | offset += BPI; // Skip mac insn. | |
8135 | } | |
8136 | } | |
8137 | } // End of "Target_aarch64::scan_erratum_835769_span". | |
8138 | ||
8139 | ||
5019d64a HS |
8140 | // Scan erratum for section SHNDX range |
8141 | // [output_address + span_start, output_address + span_end). | |
8142 | ||
8143 | template<int size, bool big_endian> | |
8144 | void | |
8145 | Target_aarch64<size, big_endian>::scan_erratum_843419_span( | |
8146 | AArch64_relobj<size, big_endian>* relobj, | |
8147 | unsigned int shndx, | |
8148 | const section_size_type span_start, | |
8149 | const section_size_type span_end, | |
8150 | unsigned char* input_view, | |
8151 | Address output_address) | |
8152 | { | |
8153 | typedef typename Insn_utilities::Insntype Insntype; | |
8154 | ||
8155 | // Adjust output_address and view to the start of span. | |
8156 | output_address += span_start; | |
8157 | input_view += span_start; | |
8158 | ||
8159 | if ((output_address & 0x03) != 0) | |
8160 | return; | |
8161 | ||
8162 | section_size_type offset = 0; | |
8163 | section_size_type span_length = span_end - span_start; | |
8164 | // The first instruction must be ending at 0xFF8 or 0xFFC. | |
8165 | unsigned int page_offset = output_address & 0xFFF; | |
8166 | // Make sure starting position, that is "output_address+offset", | |
8167 | // starts at page position 0xff8 or 0xffc. | |
8168 | if (page_offset < 0xff8) | |
8169 | offset = 0xff8 - page_offset; | |
8170 | while (offset + 3 * Insn_utilities::BYTES_PER_INSN <= span_length) | |
8171 | { | |
8172 | Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset); | |
8173 | Insntype insn1 = ip[0]; | |
8174 | if (Insn_utilities::is_adrp(insn1)) | |
8175 | { | |
8176 | Insntype insn2 = ip[1]; | |
8177 | Insntype insn3 = ip[2]; | |
a48d0c12 HS |
8178 | Insntype erratum_insn; |
8179 | unsigned insn_offset; | |
5019d64a HS |
8180 | bool do_report = false; |
8181 | if (is_erratum_843419_sequence(insn1, insn2, insn3)) | |
a48d0c12 HS |
8182 | { |
8183 | do_report = true; | |
8184 | erratum_insn = insn3; | |
8185 | insn_offset = 2 * Insn_utilities::BYTES_PER_INSN; | |
8186 | } | |
5019d64a HS |
8187 | else if (offset + 4 * Insn_utilities::BYTES_PER_INSN <= span_length) |
8188 | { | |
8189 | // Optionally we can have an insn between ins2 and ins3 | |
8190 | Insntype insn_opt = ip[2]; | |
8191 | // And insn_opt must not be a branch. | |
8192 | if (!Insn_utilities::aarch64_b(insn_opt) | |
8193 | && !Insn_utilities::aarch64_bl(insn_opt) | |
8194 | && !Insn_utilities::aarch64_blr(insn_opt) | |
8195 | && !Insn_utilities::aarch64_br(insn_opt)) | |
8196 | { | |
8197 | // And insn_opt must not write to dest reg in insn1. However | |
8198 | // we do a conservative scan, which means we may fix/report | |
8199 | // more than necessary, but it doesn't hurt. | |
8200 | ||
8201 | Insntype insn4 = ip[3]; | |
8202 | if (is_erratum_843419_sequence(insn1, insn2, insn4)) | |
a48d0c12 HS |
8203 | { |
8204 | do_report = true; | |
8205 | erratum_insn = insn4; | |
8206 | insn_offset = 3 * Insn_utilities::BYTES_PER_INSN; | |
8207 | } | |
5019d64a HS |
8208 | } |
8209 | } | |
8210 | if (do_report) | |
8211 | { | |
73854cdd | 8212 | gold_info(_("Erratum 843419 found and fixed at \"%s\", " |
a48d0c12 HS |
8213 | "section %d, offset 0x%08x."), |
8214 | relobj->name().c_str(), shndx, | |
8215 | (unsigned int)(span_start + offset)); | |
2f0c79aa | 8216 | unsigned int erratum_insn_offset = |
a48d0c12 | 8217 | span_start + offset + insn_offset; |
2f0c79aa HS |
8218 | Address erratum_address = |
8219 | output_address + offset + insn_offset; | |
8220 | create_erratum_stub(relobj, shndx, | |
8221 | erratum_insn_offset, erratum_address, | |
0ef3814f HS |
8222 | erratum_insn, ST_E_843419, |
8223 | span_start + offset); | |
5019d64a HS |
8224 | } |
8225 | } | |
8226 | ||
8227 | // Advance to next candidate instruction. We only consider instruction | |
8228 | // sequences starting at a page offset of 0xff8 or 0xffc. | |
8229 | page_offset = (output_address + offset) & 0xfff; | |
8230 | if (page_offset == 0xff8) | |
8231 | offset += 4; | |
8232 | else // (page_offset == 0xffc), we move to next page's 0xff8. | |
8233 | offset += 0xffc; | |
8234 | } | |
a48d0c12 | 8235 | } // End of "Target_aarch64::scan_erratum_843419_span". |
5019d64a HS |
8236 | |
8237 | ||
053a4d68 JY |
8238 | // The selector for aarch64 object files. |
8239 | ||
8240 | template<int size, bool big_endian> | |
8241 | class Target_selector_aarch64 : public Target_selector | |
8242 | { | |
8243 | public: | |
9363c7c3 | 8244 | Target_selector_aarch64(); |
053a4d68 JY |
8245 | |
8246 | virtual Target* | |
8247 | do_instantiate_target() | |
8248 | { return new Target_aarch64<size, big_endian>(); } | |
8249 | }; | |
8250 | ||
9363c7c3 JY |
8251 | template<> |
8252 | Target_selector_aarch64<32, true>::Target_selector_aarch64() | |
8253 | : Target_selector(elfcpp::EM_AARCH64, 32, true, | |
8254 | "elf32-bigaarch64", "aarch64_elf32_be_vec") | |
8255 | { } | |
8256 | ||
8257 | template<> | |
8258 | Target_selector_aarch64<32, false>::Target_selector_aarch64() | |
8259 | : Target_selector(elfcpp::EM_AARCH64, 32, false, | |
8260 | "elf32-littleaarch64", "aarch64_elf32_le_vec") | |
8261 | { } | |
8262 | ||
8263 | template<> | |
8264 | Target_selector_aarch64<64, true>::Target_selector_aarch64() | |
8265 | : Target_selector(elfcpp::EM_AARCH64, 64, true, | |
8266 | "elf64-bigaarch64", "aarch64_elf64_be_vec") | |
8267 | { } | |
8268 | ||
8269 | template<> | |
8270 | Target_selector_aarch64<64, false>::Target_selector_aarch64() | |
8271 | : Target_selector(elfcpp::EM_AARCH64, 64, false, | |
8272 | "elf64-littleaarch64", "aarch64_elf64_le_vec") | |
8273 | { } | |
8274 | ||
053a4d68 JY |
8275 | Target_selector_aarch64<32, true> target_selector_aarch64elf32b; |
8276 | Target_selector_aarch64<32, false> target_selector_aarch64elf32; | |
8277 | Target_selector_aarch64<64, true> target_selector_aarch64elfb; | |
8278 | Target_selector_aarch64<64, false> target_selector_aarch64elf; | |
8279 | ||
053a4d68 | 8280 | } // End anonymous namespace. |