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[binutils-gdb.git] / bfd / elfxx-riscv.c
blob55db39218e40b9bd78a7f1ca0328459634d45acd
1 /* RISC-V-specific support for ELF.
2 Copyright (C) 2011-2017 Free Software Foundation, Inc.
3
4 Contributed by Andrew Waterman (andrew@sifive.com).
5 Based on TILE-Gx and MIPS targets.
6
7 This file is part of BFD, the Binary File Descriptor library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; see the file COPYING3. If not,
21 see <http://www.gnu.org/licenses/>. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/riscv.h"
28 #include "opcode/riscv.h"
29 #include "libiberty.h"
30 #include "elfxx-riscv.h"
31 #include <stdint.h>
32
33 #define MINUS_ONE ((bfd_vma)0 - 1)
34
35 /* Special handler for ADD/SUB relocations that allows them to be filled out
36 both in the pre-linked and post-linked file. This is necessary to make
37 pre-linked debug info work, as due to linker relaxations we need to emit
38 relocations for the debug info. */
39 static bfd_reloc_status_type riscv_elf_add_sub_reloc
40 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
41
42 /* The relocation table used for SHT_RELA sections. */
43
44 static reloc_howto_type howto_table[] =
45 {
46 /* No relocation. */
47 HOWTO (R_RISCV_NONE, /* type */
48 0, /* rightshift */
49 3, /* size */
50 0, /* bitsize */
51 FALSE, /* pc_relative */
52 0, /* bitpos */
53 complain_overflow_dont, /* complain_on_overflow */
54 bfd_elf_generic_reloc, /* special_function */
55 "R_RISCV_NONE", /* name */
56 FALSE, /* partial_inplace */
57 0, /* src_mask */
58 0, /* dst_mask */
59 FALSE), /* pcrel_offset */
60
61 /* 32 bit relocation. */
62 HOWTO (R_RISCV_32, /* type */
63 0, /* rightshift */
64 2, /* size */
65 32, /* bitsize */
66 FALSE, /* pc_relative */
67 0, /* bitpos */
68 complain_overflow_dont, /* complain_on_overflow */
69 bfd_elf_generic_reloc, /* special_function */
70 "R_RISCV_32", /* name */
71 FALSE, /* partial_inplace */
72 0, /* src_mask */
73 MINUS_ONE, /* dst_mask */
74 FALSE), /* pcrel_offset */
75
76 /* 64 bit relocation. */
77 HOWTO (R_RISCV_64, /* type */
78 0, /* rightshift */
79 4, /* size */
80 64, /* bitsize */
81 FALSE, /* pc_relative */
82 0, /* bitpos */
83 complain_overflow_dont, /* complain_on_overflow */
84 bfd_elf_generic_reloc, /* special_function */
85 "R_RISCV_64", /* name */
86 FALSE, /* partial_inplace */
87 0, /* src_mask */
88 MINUS_ONE, /* dst_mask */
89 FALSE), /* pcrel_offset */
90
91 /* Relocation against a local symbol in a shared object. */
92 HOWTO (R_RISCV_RELATIVE, /* type */
93 0, /* rightshift */
94 2, /* size */
95 32, /* bitsize */
96 FALSE, /* pc_relative */
97 0, /* bitpos */
98 complain_overflow_dont, /* complain_on_overflow */
99 bfd_elf_generic_reloc, /* special_function */
100 "R_RISCV_RELATIVE", /* name */
101 FALSE, /* partial_inplace */
102 0, /* src_mask */
103 MINUS_ONE, /* dst_mask */
104 FALSE), /* pcrel_offset */
105
106 HOWTO (R_RISCV_COPY, /* type */
107 0, /* rightshift */
108 0, /* this one is variable size */
109 0, /* bitsize */
110 FALSE, /* pc_relative */
111 0, /* bitpos */
112 complain_overflow_bitfield, /* complain_on_overflow */
113 bfd_elf_generic_reloc, /* special_function */
114 "R_RISCV_COPY", /* name */
115 FALSE, /* partial_inplace */
116 0, /* src_mask */
117 0, /* dst_mask */
118 FALSE), /* pcrel_offset */
119
120 HOWTO (R_RISCV_JUMP_SLOT, /* type */
121 0, /* rightshift */
122 4, /* size */
123 64, /* bitsize */
124 FALSE, /* pc_relative */
125 0, /* bitpos */
126 complain_overflow_bitfield, /* complain_on_overflow */
127 bfd_elf_generic_reloc, /* special_function */
128 "R_RISCV_JUMP_SLOT", /* name */
129 FALSE, /* partial_inplace */
130 0, /* src_mask */
131 0, /* dst_mask */
132 FALSE), /* pcrel_offset */
133
134 /* Dynamic TLS relocations. */
135 HOWTO (R_RISCV_TLS_DTPMOD32, /* type */
136 0, /* rightshift */
137 4, /* size */
138 32, /* bitsize */
139 FALSE, /* pc_relative */
140 0, /* bitpos */
141 complain_overflow_dont, /* complain_on_overflow */
142 bfd_elf_generic_reloc, /* special_function */
143 "R_RISCV_TLS_DTPMOD32", /* name */
144 FALSE, /* partial_inplace */
145 0, /* src_mask */
146 MINUS_ONE, /* dst_mask */
147 FALSE), /* pcrel_offset */
148
149 HOWTO (R_RISCV_TLS_DTPMOD64, /* type */
150 0, /* rightshift */
151 4, /* size */
152 64, /* bitsize */
153 FALSE, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_dont, /* complain_on_overflow */
156 bfd_elf_generic_reloc, /* special_function */
157 "R_RISCV_TLS_DTPMOD64", /* name */
158 FALSE, /* partial_inplace */
159 0, /* src_mask */
160 MINUS_ONE, /* dst_mask */
161 FALSE), /* pcrel_offset */
162
163 HOWTO (R_RISCV_TLS_DTPREL32, /* type */
164 0, /* rightshift */
165 4, /* size */
166 32, /* bitsize */
167 FALSE, /* pc_relative */
168 0, /* bitpos */
169 complain_overflow_dont, /* complain_on_overflow */
170 bfd_elf_generic_reloc, /* special_function */
171 "R_RISCV_TLS_DTPREL32", /* name */
172 TRUE, /* partial_inplace */
173 0, /* src_mask */
174 MINUS_ONE, /* dst_mask */
175 FALSE), /* pcrel_offset */
176
177 HOWTO (R_RISCV_TLS_DTPREL64, /* type */
178 0, /* rightshift */
179 4, /* size */
180 64, /* bitsize */
181 FALSE, /* pc_relative */
182 0, /* bitpos */
183 complain_overflow_dont, /* complain_on_overflow */
184 bfd_elf_generic_reloc, /* special_function */
185 "R_RISCV_TLS_DTPREL64", /* name */
186 TRUE, /* partial_inplace */
187 0, /* src_mask */
188 MINUS_ONE, /* dst_mask */
189 FALSE), /* pcrel_offset */
190
191 HOWTO (R_RISCV_TLS_TPREL32, /* type */
192 0, /* rightshift */
193 2, /* size */
194 32, /* bitsize */
195 FALSE, /* pc_relative */
196 0, /* bitpos */
197 complain_overflow_dont, /* complain_on_overflow */
198 bfd_elf_generic_reloc, /* special_function */
199 "R_RISCV_TLS_TPREL32", /* name */
200 FALSE, /* partial_inplace */
201 0, /* src_mask */
202 MINUS_ONE, /* dst_mask */
203 FALSE), /* pcrel_offset */
204
205 HOWTO (R_RISCV_TLS_TPREL64, /* type */
206 0, /* rightshift */
207 4, /* size */
208 64, /* bitsize */
209 FALSE, /* pc_relative */
210 0, /* bitpos */
211 complain_overflow_dont, /* complain_on_overflow */
212 bfd_elf_generic_reloc, /* special_function */
213 "R_RISCV_TLS_TPREL64", /* name */
214 FALSE, /* partial_inplace */
215 0, /* src_mask */
216 MINUS_ONE, /* dst_mask */
217 FALSE), /* pcrel_offset */
218
219 /* Reserved for future relocs that the dynamic linker must understand. */
220 EMPTY_HOWTO (12),
221 EMPTY_HOWTO (13),
222 EMPTY_HOWTO (14),
223 EMPTY_HOWTO (15),
224
225 /* 12-bit PC-relative branch offset. */
226 HOWTO (R_RISCV_BRANCH, /* type */
227 0, /* rightshift */
228 2, /* size */
229 32, /* bitsize */
230 TRUE, /* pc_relative */
231 0, /* bitpos */
232 complain_overflow_signed, /* complain_on_overflow */
233 bfd_elf_generic_reloc, /* special_function */
234 "R_RISCV_BRANCH", /* name */
235 FALSE, /* partial_inplace */
236 0, /* src_mask */
237 ENCODE_SBTYPE_IMM (-1U), /* dst_mask */
238 TRUE), /* pcrel_offset */
239
240 /* 20-bit PC-relative jump offset. */
241 HOWTO (R_RISCV_JAL, /* type */
242 0, /* rightshift */
243 2, /* size */
244 32, /* bitsize */
245 TRUE, /* pc_relative */
246 0, /* bitpos */
247 complain_overflow_dont, /* complain_on_overflow */
248 bfd_elf_generic_reloc, /* special_function */
249 "R_RISCV_JAL", /* name */
250 FALSE, /* partial_inplace */
251 0, /* src_mask */
252 ENCODE_UJTYPE_IMM (-1U), /* dst_mask */
253 TRUE), /* pcrel_offset */
254
255 /* 32-bit PC-relative function call (AUIPC/JALR). */
256 HOWTO (R_RISCV_CALL, /* type */
257 0, /* rightshift */
258 2, /* size */
259 64, /* bitsize */
260 TRUE, /* pc_relative */
261 0, /* bitpos */
262 complain_overflow_dont, /* complain_on_overflow */
263 bfd_elf_generic_reloc, /* special_function */
264 "R_RISCV_CALL", /* name */
265 FALSE, /* partial_inplace */
266 0, /* src_mask */
267 ENCODE_UTYPE_IMM (-1U) | ((bfd_vma) ENCODE_ITYPE_IMM (-1U) << 32),
268 /* dst_mask */
269 TRUE), /* pcrel_offset */
270
271 /* Like R_RISCV_CALL, but not locally binding. */
272 HOWTO (R_RISCV_CALL_PLT, /* type */
273 0, /* rightshift */
274 2, /* size */
275 64, /* bitsize */
276 TRUE, /* pc_relative */
277 0, /* bitpos */
278 complain_overflow_dont, /* complain_on_overflow */
279 bfd_elf_generic_reloc, /* special_function */
280 "R_RISCV_CALL_PLT", /* name */
281 FALSE, /* partial_inplace */
282 0, /* src_mask */
283 ENCODE_UTYPE_IMM (-1U) | ((bfd_vma) ENCODE_ITYPE_IMM (-1U) << 32),
284 /* dst_mask */
285 TRUE), /* pcrel_offset */
286
287 /* High 20 bits of 32-bit PC-relative GOT access. */
288 HOWTO (R_RISCV_GOT_HI20, /* type */
289 0, /* rightshift */
290 2, /* size */
291 32, /* bitsize */
292 TRUE, /* pc_relative */
293 0, /* bitpos */
294 complain_overflow_dont, /* complain_on_overflow */
295 bfd_elf_generic_reloc, /* special_function */
296 "R_RISCV_GOT_HI20", /* name */
297 FALSE, /* partial_inplace */
298 0, /* src_mask */
299 ENCODE_UTYPE_IMM (-1U), /* dst_mask */
300 FALSE), /* pcrel_offset */
301
302 /* High 20 bits of 32-bit PC-relative TLS IE GOT access. */
303 HOWTO (R_RISCV_TLS_GOT_HI20, /* type */
304 0, /* rightshift */
305 2, /* size */
306 32, /* bitsize */
307 TRUE, /* pc_relative */
308 0, /* bitpos */
309 complain_overflow_dont, /* complain_on_overflow */
310 bfd_elf_generic_reloc, /* special_function */
311 "R_RISCV_TLS_GOT_HI20", /* name */
312 FALSE, /* partial_inplace */
313 0, /* src_mask */
314 ENCODE_UTYPE_IMM (-1U), /* dst_mask */
315 FALSE), /* pcrel_offset */
316
317 /* High 20 bits of 32-bit PC-relative TLS GD GOT reference. */
318 HOWTO (R_RISCV_TLS_GD_HI20, /* type */
319 0, /* rightshift */
320 2, /* size */
321 32, /* bitsize */
322 TRUE, /* pc_relative */
323 0, /* bitpos */
324 complain_overflow_dont, /* complain_on_overflow */
325 bfd_elf_generic_reloc, /* special_function */
326 "R_RISCV_TLS_GD_HI20", /* name */
327 FALSE, /* partial_inplace */
328 0, /* src_mask */
329 ENCODE_UTYPE_IMM (-1U), /* dst_mask */
330 FALSE), /* pcrel_offset */
331
332 /* High 20 bits of 32-bit PC-relative reference. */
333 HOWTO (R_RISCV_PCREL_HI20, /* type */
334 0, /* rightshift */
335 2, /* size */
336 32, /* bitsize */
337 TRUE, /* pc_relative */
338 0, /* bitpos */
339 complain_overflow_dont, /* complain_on_overflow */
340 bfd_elf_generic_reloc, /* special_function */
341 "R_RISCV_PCREL_HI20", /* name */
342 FALSE, /* partial_inplace */
343 0, /* src_mask */
344 ENCODE_UTYPE_IMM (-1U), /* dst_mask */
345 TRUE), /* pcrel_offset */
346
347 /* Low 12 bits of a 32-bit PC-relative load or add. */
348 HOWTO (R_RISCV_PCREL_LO12_I, /* type */
349 0, /* rightshift */
350 2, /* size */
351 32, /* bitsize */
352 FALSE, /* pc_relative */
353 0, /* bitpos */
354 complain_overflow_dont, /* complain_on_overflow */
355 bfd_elf_generic_reloc, /* special_function */
356 "R_RISCV_PCREL_LO12_I", /* name */
357 FALSE, /* partial_inplace */
358 0, /* src_mask */
359 ENCODE_ITYPE_IMM (-1U), /* dst_mask */
360 FALSE), /* pcrel_offset */
361
362 /* Low 12 bits of a 32-bit PC-relative store. */
363 HOWTO (R_RISCV_PCREL_LO12_S, /* type */
364 0, /* rightshift */
365 2, /* size */
366 32, /* bitsize */
367 FALSE, /* pc_relative */
368 0, /* bitpos */
369 complain_overflow_dont, /* complain_on_overflow */
370 bfd_elf_generic_reloc, /* special_function */
371 "R_RISCV_PCREL_LO12_S", /* name */
372 FALSE, /* partial_inplace */
373 0, /* src_mask */
374 ENCODE_STYPE_IMM (-1U), /* dst_mask */
375 FALSE), /* pcrel_offset */
376
377 /* High 20 bits of 32-bit absolute address. */
378 HOWTO (R_RISCV_HI20, /* type */
379 0, /* rightshift */
380 2, /* size */
381 32, /* bitsize */
382 FALSE, /* pc_relative */
383 0, /* bitpos */
384 complain_overflow_dont, /* complain_on_overflow */
385 bfd_elf_generic_reloc, /* special_function */
386 "R_RISCV_HI20", /* name */
387 FALSE, /* partial_inplace */
388 0, /* src_mask */
389 ENCODE_UTYPE_IMM (-1U), /* dst_mask */
390 FALSE), /* pcrel_offset */
391
392 /* High 12 bits of 32-bit load or add. */
393 HOWTO (R_RISCV_LO12_I, /* type */
394 0, /* rightshift */
395 2, /* size */
396 32, /* bitsize */
397 FALSE, /* pc_relative */
398 0, /* bitpos */
399 complain_overflow_dont, /* complain_on_overflow */
400 bfd_elf_generic_reloc, /* special_function */
401 "R_RISCV_LO12_I", /* name */
402 FALSE, /* partial_inplace */
403 0, /* src_mask */
404 ENCODE_ITYPE_IMM (-1U), /* dst_mask */
405 FALSE), /* pcrel_offset */
406
407 /* High 12 bits of 32-bit store. */
408 HOWTO (R_RISCV_LO12_S, /* type */
409 0, /* rightshift */
410 2, /* size */
411 32, /* bitsize */
412 FALSE, /* pc_relative */
413 0, /* bitpos */
414 complain_overflow_dont, /* complain_on_overflow */
415 bfd_elf_generic_reloc, /* special_function */
416 "R_RISCV_LO12_S", /* name */
417 FALSE, /* partial_inplace */
418 0, /* src_mask */
419 ENCODE_STYPE_IMM (-1U), /* dst_mask */
420 FALSE), /* pcrel_offset */
421
422 /* High 20 bits of TLS LE thread pointer offset. */
423 HOWTO (R_RISCV_TPREL_HI20, /* type */
424 0, /* rightshift */
425 2, /* size */
426 32, /* bitsize */
427 FALSE, /* pc_relative */
428 0, /* bitpos */
429 complain_overflow_signed, /* complain_on_overflow */
430 bfd_elf_generic_reloc, /* special_function */
431 "R_RISCV_TPREL_HI20", /* name */
432 TRUE, /* partial_inplace */
433 0, /* src_mask */
434 ENCODE_UTYPE_IMM (-1U), /* dst_mask */
435 FALSE), /* pcrel_offset */
436
437 /* Low 12 bits of TLS LE thread pointer offset for loads and adds. */
438 HOWTO (R_RISCV_TPREL_LO12_I, /* type */
439 0, /* rightshift */
440 2, /* size */
441 32, /* bitsize */
442 FALSE, /* pc_relative */
443 0, /* bitpos */
444 complain_overflow_signed, /* complain_on_overflow */
445 bfd_elf_generic_reloc, /* special_function */
446 "R_RISCV_TPREL_LO12_I", /* name */
447 FALSE, /* partial_inplace */
448 0, /* src_mask */
449 ENCODE_ITYPE_IMM (-1U), /* dst_mask */
450 FALSE), /* pcrel_offset */
451
452 /* Low 12 bits of TLS LE thread pointer offset for stores. */
453 HOWTO (R_RISCV_TPREL_LO12_S, /* type */
454 0, /* rightshift */
455 2, /* size */
456 32, /* bitsize */
457 FALSE, /* pc_relative */
458 0, /* bitpos */
459 complain_overflow_signed, /* complain_on_overflow */
460 bfd_elf_generic_reloc, /* special_function */
461 "R_RISCV_TPREL_LO12_S", /* name */
462 FALSE, /* partial_inplace */
463 0, /* src_mask */
464 ENCODE_STYPE_IMM (-1U), /* dst_mask */
465 FALSE), /* pcrel_offset */
466
467 /* TLS LE thread pointer usage. May be relaxed. */
468 HOWTO (R_RISCV_TPREL_ADD, /* type */
469 0, /* rightshift */
470 2, /* size */
471 32, /* bitsize */
472 FALSE, /* pc_relative */
473 0, /* bitpos */
474 complain_overflow_dont, /* complain_on_overflow */
475 bfd_elf_generic_reloc, /* special_function */
476 "R_RISCV_TPREL_ADD", /* name */
477 TRUE, /* partial_inplace */
478 0, /* src_mask */
479 0, /* dst_mask */
480 FALSE), /* pcrel_offset */
481
482 /* 8-bit in-place addition, for local label subtraction. */
483 HOWTO (R_RISCV_ADD8, /* type */
484 0, /* rightshift */
485 0, /* size */
486 8, /* bitsize */
487 FALSE, /* pc_relative */
488 0, /* bitpos */
489 complain_overflow_dont, /* complain_on_overflow */
490 riscv_elf_add_sub_reloc, /* special_function */
491 "R_RISCV_ADD8", /* name */
492 FALSE, /* partial_inplace */
493 0, /* src_mask */
494 MINUS_ONE, /* dst_mask */
495 FALSE), /* pcrel_offset */
496
497 /* 16-bit in-place addition, for local label subtraction. */
498 HOWTO (R_RISCV_ADD16, /* type */
499 0, /* rightshift */
500 1, /* size */
501 16, /* bitsize */
502 FALSE, /* pc_relative */
503 0, /* bitpos */
504 complain_overflow_dont, /* complain_on_overflow */
505 riscv_elf_add_sub_reloc, /* special_function */
506 "R_RISCV_ADD16", /* name */
507 FALSE, /* partial_inplace */
508 0, /* src_mask */
509 MINUS_ONE, /* dst_mask */
510 FALSE), /* pcrel_offset */
511
512 /* 32-bit in-place addition, for local label subtraction. */
513 HOWTO (R_RISCV_ADD32, /* type */
514 0, /* rightshift */
515 2, /* size */
516 32, /* bitsize */
517 FALSE, /* pc_relative */
518 0, /* bitpos */
519 complain_overflow_dont, /* complain_on_overflow */
520 riscv_elf_add_sub_reloc, /* special_function */
521 "R_RISCV_ADD32", /* name */
522 FALSE, /* partial_inplace */
523 0, /* src_mask */
524 MINUS_ONE, /* dst_mask */
525 FALSE), /* pcrel_offset */
526
527 /* 64-bit in-place addition, for local label subtraction. */
528 HOWTO (R_RISCV_ADD64, /* type */
529 0, /* rightshift */
530 4, /* size */
531 64, /* bitsize */
532 FALSE, /* pc_relative */
533 0, /* bitpos */
534 complain_overflow_dont, /* complain_on_overflow */
535 riscv_elf_add_sub_reloc, /* special_function */
536 "R_RISCV_ADD64", /* name */
537 FALSE, /* partial_inplace */
538 0, /* src_mask */
539 MINUS_ONE, /* dst_mask */
540 FALSE), /* pcrel_offset */
541
542 /* 8-bit in-place addition, for local label subtraction. */
543 HOWTO (R_RISCV_SUB8, /* type */
544 0, /* rightshift */
545 0, /* size */
546 8, /* bitsize */
547 FALSE, /* pc_relative */
548 0, /* bitpos */
549 complain_overflow_dont, /* complain_on_overflow */
550 riscv_elf_add_sub_reloc, /* special_function */
551 "R_RISCV_SUB8", /* name */
552 FALSE, /* partial_inplace */
553 0, /* src_mask */
554 MINUS_ONE, /* dst_mask */
555 FALSE), /* pcrel_offset */
556
557 /* 16-bit in-place addition, for local label subtraction. */
558 HOWTO (R_RISCV_SUB16, /* type */
559 0, /* rightshift */
560 1, /* size */
561 16, /* bitsize */
562 FALSE, /* pc_relative */
563 0, /* bitpos */
564 complain_overflow_dont, /* complain_on_overflow */
565 riscv_elf_add_sub_reloc, /* special_function */
566 "R_RISCV_SUB16", /* name */
567 FALSE, /* partial_inplace */
568 0, /* src_mask */
569 MINUS_ONE, /* dst_mask */
570 FALSE), /* pcrel_offset */
571
572 /* 32-bit in-place addition, for local label subtraction. */
573 HOWTO (R_RISCV_SUB32, /* type */
574 0, /* rightshift */
575 2, /* size */
576 32, /* bitsize */
577 FALSE, /* pc_relative */
578 0, /* bitpos */
579 complain_overflow_dont, /* complain_on_overflow */
580 riscv_elf_add_sub_reloc, /* special_function */
581 "R_RISCV_SUB32", /* name */
582 FALSE, /* partial_inplace */
583 0, /* src_mask */
584 MINUS_ONE, /* dst_mask */
585 FALSE), /* pcrel_offset */
586
587 /* 64-bit in-place addition, for local label subtraction. */
588 HOWTO (R_RISCV_SUB64, /* type */
589 0, /* rightshift */
590 4, /* size */
591 64, /* bitsize */
592 FALSE, /* pc_relative */
593 0, /* bitpos */
594 complain_overflow_dont, /* complain_on_overflow */
595 riscv_elf_add_sub_reloc, /* special_function */
596 "R_RISCV_SUB64", /* name */
597 FALSE, /* partial_inplace */
598 0, /* src_mask */
599 MINUS_ONE, /* dst_mask */
600 FALSE), /* pcrel_offset */
601
602 /* GNU extension to record C++ vtable hierarchy */
603 HOWTO (R_RISCV_GNU_VTINHERIT, /* type */
604 0, /* rightshift */
605 4, /* size */
606 0, /* bitsize */
607 FALSE, /* pc_relative */
608 0, /* bitpos */
609 complain_overflow_dont, /* complain_on_overflow */
610 NULL, /* special_function */
611 "R_RISCV_GNU_VTINHERIT", /* name */
612 FALSE, /* partial_inplace */
613 0, /* src_mask */
614 0, /* dst_mask */
615 FALSE), /* pcrel_offset */
616
617 /* GNU extension to record C++ vtable member usage */
618 HOWTO (R_RISCV_GNU_VTENTRY, /* type */
619 0, /* rightshift */
620 4, /* size */
621 0, /* bitsize */
622 FALSE, /* pc_relative */
623 0, /* bitpos */
624 complain_overflow_dont, /* complain_on_overflow */
625 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
626 "R_RISCV_GNU_VTENTRY", /* name */
627 FALSE, /* partial_inplace */
628 0, /* src_mask */
629 0, /* dst_mask */
630 FALSE), /* pcrel_offset */
631
632 /* Indicates an alignment statement. The addend field encodes how many
633 bytes of NOPs follow the statement. The desired alignment is the
634 addend rounded up to the next power of two. */
635 HOWTO (R_RISCV_ALIGN, /* type */
636 0, /* rightshift */
637 2, /* size */
638 0, /* bitsize */
639 FALSE, /* pc_relative */
640 0, /* bitpos */
641 complain_overflow_dont, /* complain_on_overflow */
642 bfd_elf_generic_reloc, /* special_function */
643 "R_RISCV_ALIGN", /* name */
644 FALSE, /* partial_inplace */
645 0, /* src_mask */
646 0, /* dst_mask */
647 TRUE), /* pcrel_offset */
648
649 /* 8-bit PC-relative branch offset. */
650 HOWTO (R_RISCV_RVC_BRANCH, /* type */
651 0, /* rightshift */
652 2, /* size */
653 32, /* bitsize */
654 TRUE, /* pc_relative */
655 0, /* bitpos */
656 complain_overflow_signed, /* complain_on_overflow */
657 bfd_elf_generic_reloc, /* special_function */
658 "R_RISCV_RVC_BRANCH", /* name */
659 FALSE, /* partial_inplace */
660 0, /* src_mask */
661 ENCODE_RVC_B_IMM (-1U), /* dst_mask */
662 TRUE), /* pcrel_offset */
663
664 /* 11-bit PC-relative jump offset. */
665 HOWTO (R_RISCV_RVC_JUMP, /* type */
666 0, /* rightshift */
667 2, /* size */
668 32, /* bitsize */
669 TRUE, /* pc_relative */
670 0, /* bitpos */
671 complain_overflow_dont, /* complain_on_overflow */
672 bfd_elf_generic_reloc, /* special_function */
673 "R_RISCV_RVC_JUMP", /* name */
674 FALSE, /* partial_inplace */
675 0, /* src_mask */
676 ENCODE_RVC_J_IMM (-1U), /* dst_mask */
677 TRUE), /* pcrel_offset */
678
679 /* High 6 bits of 18-bit absolute address. */
680 HOWTO (R_RISCV_RVC_LUI, /* type */
681 0, /* rightshift */
682 2, /* size */
683 32, /* bitsize */
684 FALSE, /* pc_relative */
685 0, /* bitpos */
686 complain_overflow_dont, /* complain_on_overflow */
687 bfd_elf_generic_reloc, /* special_function */
688 "R_RISCV_RVC_LUI", /* name */
689 FALSE, /* partial_inplace */
690 0, /* src_mask */
691 ENCODE_RVC_IMM (-1U), /* dst_mask */
692 FALSE), /* pcrel_offset */
693
694 /* GP-relative load. */
695 HOWTO (R_RISCV_GPREL_I, /* type */
696 0, /* rightshift */
697 2, /* size */
698 32, /* bitsize */
699 FALSE, /* pc_relative */
700 0, /* bitpos */
701 complain_overflow_dont, /* complain_on_overflow */
702 bfd_elf_generic_reloc, /* special_function */
703 "R_RISCV_GPREL_I", /* name */
704 FALSE, /* partial_inplace */
705 0, /* src_mask */
706 ENCODE_ITYPE_IMM (-1U), /* dst_mask */
707 FALSE), /* pcrel_offset */
708
709 /* GP-relative store. */
710 HOWTO (R_RISCV_GPREL_S, /* type */
711 0, /* rightshift */
712 2, /* size */
713 32, /* bitsize */
714 FALSE, /* pc_relative */
715 0, /* bitpos */
716 complain_overflow_dont, /* complain_on_overflow */
717 bfd_elf_generic_reloc, /* special_function */
718 "R_RISCV_GPREL_S", /* name */
719 FALSE, /* partial_inplace */
720 0, /* src_mask */
721 ENCODE_STYPE_IMM (-1U), /* dst_mask */
722 FALSE), /* pcrel_offset */
723
724 /* TP-relative TLS LE load. */
725 HOWTO (R_RISCV_TPREL_I, /* type */
726 0, /* rightshift */
727 2, /* size */
728 32, /* bitsize */
729 FALSE, /* pc_relative */
730 0, /* bitpos */
731 complain_overflow_signed, /* complain_on_overflow */
732 bfd_elf_generic_reloc, /* special_function */
733 "R_RISCV_TPREL_I", /* name */
734 FALSE, /* partial_inplace */
735 0, /* src_mask */
736 ENCODE_ITYPE_IMM (-1U), /* dst_mask */
737 FALSE), /* pcrel_offset */
738
739 /* TP-relative TLS LE store. */
740 HOWTO (R_RISCV_TPREL_S, /* type */
741 0, /* rightshift */
742 2, /* size */
743 32, /* bitsize */
744 FALSE, /* pc_relative */
745 0, /* bitpos */
746 complain_overflow_signed, /* complain_on_overflow */
747 bfd_elf_generic_reloc, /* special_function */
748 "R_RISCV_TPREL_S", /* name */
749 FALSE, /* partial_inplace */
750 0, /* src_mask */
751 ENCODE_STYPE_IMM (-1U), /* dst_mask */
752 FALSE), /* pcrel_offset */
753
754 /* The paired relocation may be relaxed. */
755 HOWTO (R_RISCV_RELAX, /* type */
756 0, /* rightshift */
757 3, /* size */
758 0, /* bitsize */
759 FALSE, /* pc_relative */
760 0, /* bitpos */
761 complain_overflow_dont, /* complain_on_overflow */
762 bfd_elf_generic_reloc, /* special_function */
763 "R_RISCV_RELAX", /* name */
764 FALSE, /* partial_inplace */
765 0, /* src_mask */
766 0, /* dst_mask */
767 FALSE), /* pcrel_offset */
768
769 /* 6-bit in-place addition, for local label subtraction. */
770 HOWTO (R_RISCV_SUB6, /* type */
771 0, /* rightshift */
772 0, /* size */
773 8, /* bitsize */
774 FALSE, /* pc_relative */
775 0, /* bitpos */
776 complain_overflow_dont, /* complain_on_overflow */
777 riscv_elf_add_sub_reloc, /* special_function */
778 "R_RISCV_SUB6", /* name */
779 FALSE, /* partial_inplace */
780 0, /* src_mask */
781 0x3f, /* dst_mask */
782 FALSE), /* pcrel_offset */
783
784 /* 6-bit in-place setting, for local label subtraction. */
785 HOWTO (R_RISCV_SET6, /* type */
786 0, /* rightshift */
787 0, /* size */
788 8, /* bitsize */
789 FALSE, /* pc_relative */
790 0, /* bitpos */
791 complain_overflow_dont, /* complain_on_overflow */
792 bfd_elf_generic_reloc, /* special_function */
793 "R_RISCV_SET6", /* name */
794 FALSE, /* partial_inplace */
795 0, /* src_mask */
796 0x3f, /* dst_mask */
797 FALSE), /* pcrel_offset */
798
799 /* 8-bit in-place setting, for local label subtraction. */
800 HOWTO (R_RISCV_SET8, /* type */
801 0, /* rightshift */
802 0, /* size */
803 8, /* bitsize */
804 FALSE, /* pc_relative */
805 0, /* bitpos */
806 complain_overflow_dont, /* complain_on_overflow */
807 bfd_elf_generic_reloc, /* special_function */
808 "R_RISCV_SET8", /* name */
809 FALSE, /* partial_inplace */
810 0, /* src_mask */
811 MINUS_ONE, /* dst_mask */
812 FALSE), /* pcrel_offset */
813
814 /* 16-bit in-place setting, for local label subtraction. */
815 HOWTO (R_RISCV_SET16, /* type */
816 0, /* rightshift */
817 1, /* size */
818 16, /* bitsize */
819 FALSE, /* pc_relative */
820 0, /* bitpos */
821 complain_overflow_dont, /* complain_on_overflow */
822 bfd_elf_generic_reloc, /* special_function */
823 "R_RISCV_SET16", /* name */
824 FALSE, /* partial_inplace */
825 0, /* src_mask */
826 MINUS_ONE, /* dst_mask */
827 FALSE), /* pcrel_offset */
828
829 /* 32-bit in-place setting, for local label subtraction. */
830 HOWTO (R_RISCV_SET32, /* type */
831 0, /* rightshift */
832 2, /* size */
833 32, /* bitsize */
834 FALSE, /* pc_relative */
835 0, /* bitpos */
836 complain_overflow_dont, /* complain_on_overflow */
837 bfd_elf_generic_reloc, /* special_function */
838 "R_RISCV_SET32", /* name */
839 FALSE, /* partial_inplace */
840 0, /* src_mask */
841 MINUS_ONE, /* dst_mask */
842 FALSE), /* pcrel_offset */
843
844 /* 32-bit PC relative. */
845 HOWTO (R_RISCV_32_PCREL, /* type */
846 0, /* rightshift */
847 2, /* size */
848 32, /* bitsize */
849 TRUE, /* pc_relative */
850 0, /* bitpos */
851 complain_overflow_dont, /* complain_on_overflow */
852 bfd_elf_generic_reloc, /* special_function */
853 "R_RISCV_32_PCREL", /* name */
854 FALSE, /* partial_inplace */
855 0, /* src_mask */
856 MINUS_ONE, /* dst_mask */
857 FALSE), /* pcrel_offset */
858 };
859
860 /* A mapping from BFD reloc types to RISC-V ELF reloc types. */
861
862 struct elf_reloc_map
863 {
864 bfd_reloc_code_real_type bfd_val;
865 enum elf_riscv_reloc_type elf_val;
866 };
867
868 static const struct elf_reloc_map riscv_reloc_map[] =
869 {
870 { BFD_RELOC_NONE, R_RISCV_NONE },
871 { BFD_RELOC_32, R_RISCV_32 },
872 { BFD_RELOC_64, R_RISCV_64 },
873 { BFD_RELOC_RISCV_ADD8, R_RISCV_ADD8 },
874 { BFD_RELOC_RISCV_ADD16, R_RISCV_ADD16 },
875 { BFD_RELOC_RISCV_ADD32, R_RISCV_ADD32 },
876 { BFD_RELOC_RISCV_ADD64, R_RISCV_ADD64 },
877 { BFD_RELOC_RISCV_SUB8, R_RISCV_SUB8 },
878 { BFD_RELOC_RISCV_SUB16, R_RISCV_SUB16 },
879 { BFD_RELOC_RISCV_SUB32, R_RISCV_SUB32 },
880 { BFD_RELOC_RISCV_SUB64, R_RISCV_SUB64 },
881 { BFD_RELOC_CTOR, R_RISCV_64 },
882 { BFD_RELOC_12_PCREL, R_RISCV_BRANCH },
883 { BFD_RELOC_RISCV_HI20, R_RISCV_HI20 },
884 { BFD_RELOC_RISCV_LO12_I, R_RISCV_LO12_I },
885 { BFD_RELOC_RISCV_LO12_S, R_RISCV_LO12_S },
886 { BFD_RELOC_RISCV_PCREL_LO12_I, R_RISCV_PCREL_LO12_I },
887 { BFD_RELOC_RISCV_PCREL_LO12_S, R_RISCV_PCREL_LO12_S },
888 { BFD_RELOC_RISCV_CALL, R_RISCV_CALL },
889 { BFD_RELOC_RISCV_CALL_PLT, R_RISCV_CALL_PLT },
890 { BFD_RELOC_RISCV_PCREL_HI20, R_RISCV_PCREL_HI20 },
891 { BFD_RELOC_RISCV_JMP, R_RISCV_JAL },
892 { BFD_RELOC_RISCV_GOT_HI20, R_RISCV_GOT_HI20 },
893 { BFD_RELOC_RISCV_TLS_DTPMOD32, R_RISCV_TLS_DTPMOD32 },
894 { BFD_RELOC_RISCV_TLS_DTPREL32, R_RISCV_TLS_DTPREL32 },
895 { BFD_RELOC_RISCV_TLS_DTPMOD64, R_RISCV_TLS_DTPMOD64 },
896 { BFD_RELOC_RISCV_TLS_DTPREL64, R_RISCV_TLS_DTPREL64 },
897 { BFD_RELOC_RISCV_TLS_TPREL32, R_RISCV_TLS_TPREL32 },
898 { BFD_RELOC_RISCV_TLS_TPREL64, R_RISCV_TLS_TPREL64 },
899 { BFD_RELOC_RISCV_TPREL_HI20, R_RISCV_TPREL_HI20 },
900 { BFD_RELOC_RISCV_TPREL_ADD, R_RISCV_TPREL_ADD },
901 { BFD_RELOC_RISCV_TPREL_LO12_S, R_RISCV_TPREL_LO12_S },
902 { BFD_RELOC_RISCV_TPREL_LO12_I, R_RISCV_TPREL_LO12_I },
903 { BFD_RELOC_RISCV_TLS_GOT_HI20, R_RISCV_TLS_GOT_HI20 },
904 { BFD_RELOC_RISCV_TLS_GD_HI20, R_RISCV_TLS_GD_HI20 },
905 { BFD_RELOC_RISCV_ALIGN, R_RISCV_ALIGN },
906 { BFD_RELOC_RISCV_RVC_BRANCH, R_RISCV_RVC_BRANCH },
907 { BFD_RELOC_RISCV_RVC_JUMP, R_RISCV_RVC_JUMP },
908 { BFD_RELOC_RISCV_RVC_LUI, R_RISCV_RVC_LUI },
909 { BFD_RELOC_RISCV_GPREL_I, R_RISCV_GPREL_I },
910 { BFD_RELOC_RISCV_GPREL_S, R_RISCV_GPREL_S },
911 { BFD_RELOC_RISCV_TPREL_I, R_RISCV_TPREL_I },
912 { BFD_RELOC_RISCV_TPREL_S, R_RISCV_TPREL_S },
913 { BFD_RELOC_RISCV_RELAX, R_RISCV_RELAX },
914 { BFD_RELOC_RISCV_SUB6, R_RISCV_SUB6 },
915 { BFD_RELOC_RISCV_SET6, R_RISCV_SET6 },
916 { BFD_RELOC_RISCV_SET8, R_RISCV_SET8 },
917 { BFD_RELOC_RISCV_SET16, R_RISCV_SET16 },
918 { BFD_RELOC_RISCV_SET32, R_RISCV_SET32 },
919 { BFD_RELOC_RISCV_32_PCREL, R_RISCV_32_PCREL },
920 };
921
922 /* Given a BFD reloc type, return a howto structure. */
923
924 reloc_howto_type *
925 riscv_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
926 bfd_reloc_code_real_type code)
927 {
928 unsigned int i;
929
930 for (i = 0; i < ARRAY_SIZE (riscv_reloc_map); i++)
931 if (riscv_reloc_map[i].bfd_val == code)
932 return &howto_table[(int) riscv_reloc_map[i].elf_val];
933
934 bfd_set_error (bfd_error_bad_value);
935 return NULL;
936 }
937
938 reloc_howto_type *
939 riscv_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
940 {
941 unsigned int i;
942
943 for (i = 0; i < ARRAY_SIZE (howto_table); i++)
944 if (howto_table[i].name && strcasecmp (howto_table[i].name, r_name) == 0)
945 return &howto_table[i];
946
947 return NULL;
948 }
949
950 reloc_howto_type *
951 riscv_elf_rtype_to_howto (unsigned int r_type)
952 {
953 if (r_type >= ARRAY_SIZE (howto_table))
954 {
955 (*_bfd_error_handler) (_("unrecognized relocation (0x%x)"), r_type);
956 bfd_set_error (bfd_error_bad_value);
957 return NULL;
958 }
959 return &howto_table[r_type];
960 }
961
962 /* Special_function of RISCV_ADD and RISCV_SUB relocations. */
963
964 static bfd_reloc_status_type
965 riscv_elf_add_sub_reloc (bfd *abfd,
966 arelent *reloc_entry,
967 asymbol *symbol,
968 void *data,
969 asection *input_section,
970 bfd *output_bfd,
971 char **error_message ATTRIBUTE_UNUSED)
972 {
973 reloc_howto_type *howto = reloc_entry->howto;
974 bfd_vma relocation;
975
976 if (output_bfd != NULL
977 && (symbol->flags & BSF_SECTION_SYM) == 0
978 && (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
979 {
980 reloc_entry->address += input_section->output_offset;
981 return bfd_reloc_ok;
982 }
983
984 if (output_bfd != NULL)
985 return bfd_reloc_continue;
986
987 relocation = symbol->value + symbol->section->output_section->vma
988 + symbol->section->output_offset + reloc_entry->addend;
989 bfd_vma old_value = bfd_get (howto->bitsize, abfd,
990 data + reloc_entry->address);
991
992 switch (howto->type)
993 {
994 case R_RISCV_ADD8:
995 case R_RISCV_ADD16:
996 case R_RISCV_ADD32:
997 case R_RISCV_ADD64:
998 relocation = old_value + relocation;
999 break;
1000 case R_RISCV_SUB6:
1001 case R_RISCV_SUB8:
1002 case R_RISCV_SUB16:
1003 case R_RISCV_SUB32:
1004 case R_RISCV_SUB64:
1005 relocation = old_value - relocation;
1006 break;
1007 }
1008 bfd_put (howto->bitsize, abfd, relocation, data + reloc_entry->address);
1009
1010 return bfd_reloc_ok;
1011 }
The GNU Binutils are a collection of binary tools.