1 /* AArch64-specific support for ELF.
2 Copyright (C) 2009-2021 Free Software Foundation, Inc.
3 Contributed by ARM Ltd.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; see the file COPYING3. If not,
19 see <http://www.gnu.org/licenses/>. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "elf-bfd.h"
24 #include "elfxx-aarch64.h"
25 #include <stdarg.h>
26 #include <string.h>
27
28 #define MASK(n) ((1u << (n)) - 1)
29
30 /* Sign-extend VALUE, which has the indicated number of BITS. */
31
32 bfd_signed_vma
_bfd_aarch64_sign_extend(bfd_vma value,int bits)33 _bfd_aarch64_sign_extend (bfd_vma value, int bits)
34 {
35 if (value & ((bfd_vma) 1 << (bits - 1)))
36 /* VALUE is negative. */
37 value |= ((bfd_vma) - 1) << bits;
38
39 return value;
40 }
41
42 /* Decode the IMM field of ADRP. */
43
44 uint32_t
_bfd_aarch64_decode_adrp_imm(uint32_t insn)45 _bfd_aarch64_decode_adrp_imm (uint32_t insn)
46 {
47 return (((insn >> 5) & MASK (19)) << 2) | ((insn >> 29) & MASK (2));
48 }
49
50 /* Reencode the imm field of add immediate. */
51 static inline uint32_t
reencode_add_imm(uint32_t insn,uint32_t imm)52 reencode_add_imm (uint32_t insn, uint32_t imm)
53 {
54 return (insn & ~(MASK (12) << 10)) | ((imm & MASK (12)) << 10);
55 }
56
57 /* Reencode the IMM field of ADR. */
58
59 uint32_t
_bfd_aarch64_reencode_adr_imm(uint32_t insn,uint32_t imm)60 _bfd_aarch64_reencode_adr_imm (uint32_t insn, uint32_t imm)
61 {
62 return (insn & ~((MASK (2) << 29) | (MASK (19) << 5)))
63 | ((imm & MASK (2)) << 29) | ((imm & (MASK (19) << 2)) << 3);
64 }
65
66 /* Reencode the imm field of ld/st pos immediate. */
67 static inline uint32_t
reencode_ldst_pos_imm(uint32_t insn,uint32_t imm)68 reencode_ldst_pos_imm (uint32_t insn, uint32_t imm)
69 {
70 return (insn & ~(MASK (12) << 10)) | ((imm & MASK (12)) << 10);
71 }
72
73 /* Encode the 26-bit offset of unconditional branch. */
74 static inline uint32_t
reencode_branch_ofs_26(uint32_t insn,uint32_t ofs)75 reencode_branch_ofs_26 (uint32_t insn, uint32_t ofs)
76 {
77 return (insn & ~MASK (26)) | (ofs & MASK (26));
78 }
79
80 /* Encode the 19-bit offset of conditional branch and compare & branch. */
81 static inline uint32_t
reencode_cond_branch_ofs_19(uint32_t insn,uint32_t ofs)82 reencode_cond_branch_ofs_19 (uint32_t insn, uint32_t ofs)
83 {
84 return (insn & ~(MASK (19) << 5)) | ((ofs & MASK (19)) << 5);
85 }
86
87 /* Decode the 19-bit offset of load literal. */
88 static inline uint32_t
reencode_ld_lit_ofs_19(uint32_t insn,uint32_t ofs)89 reencode_ld_lit_ofs_19 (uint32_t insn, uint32_t ofs)
90 {
91 return (insn & ~(MASK (19) << 5)) | ((ofs & MASK (19)) << 5);
92 }
93
94 /* Encode the 14-bit offset of test & branch. */
95 static inline uint32_t
reencode_tst_branch_ofs_14(uint32_t insn,uint32_t ofs)96 reencode_tst_branch_ofs_14 (uint32_t insn, uint32_t ofs)
97 {
98 return (insn & ~(MASK (14) << 5)) | ((ofs & MASK (14)) << 5);
99 }
100
101 /* Reencode the imm field of move wide. */
102 static inline uint32_t
reencode_movw_imm(uint32_t insn,uint32_t imm)103 reencode_movw_imm (uint32_t insn, uint32_t imm)
104 {
105 return (insn & ~(MASK (16) << 5)) | ((imm & MASK (16)) << 5);
106 }
107
108 /* Reencode mov[zn] to movz. */
109 static inline uint32_t
reencode_movzn_to_movz(uint32_t opcode)110 reencode_movzn_to_movz (uint32_t opcode)
111 {
112 return opcode | (1 << 30);
113 }
114
115 /* Reencode mov[zn] to movn. */
116 static inline uint32_t
reencode_movzn_to_movn(uint32_t opcode)117 reencode_movzn_to_movn (uint32_t opcode)
118 {
119 return opcode & ~(1 << 30);
120 }
121
122 /* Return non-zero if the indicated VALUE has overflowed the maximum
123 range expressible by a unsigned number with the indicated number of
124 BITS. */
125
126 static bfd_reloc_status_type
aarch64_unsigned_overflow(bfd_vma value,unsigned int bits)127 aarch64_unsigned_overflow (bfd_vma value, unsigned int bits)
128 {
129 bfd_vma lim;
130 if (bits >= sizeof (bfd_vma) * 8)
131 return bfd_reloc_ok;
132 lim = (bfd_vma) 1 << bits;
133 if (value >= lim)
134 return bfd_reloc_overflow;
135 return bfd_reloc_ok;
136 }
137
138 /* Return non-zero if the indicated VALUE has overflowed the maximum
139 range expressible by an signed number with the indicated number of
140 BITS. */
141
142 static bfd_reloc_status_type
aarch64_signed_overflow(bfd_vma value,unsigned int bits)143 aarch64_signed_overflow (bfd_vma value, unsigned int bits)
144 {
145 bfd_signed_vma svalue = (bfd_signed_vma) value;
146 bfd_signed_vma lim;
147
148 if (bits >= sizeof (bfd_vma) * 8)
149 return bfd_reloc_ok;
150 lim = (bfd_signed_vma) 1 << (bits - 1);
151 if (svalue < -lim || svalue >= lim)
152 return bfd_reloc_overflow;
153 return bfd_reloc_ok;
154 }
155
156 /* Insert the addend/value into the instruction or data object being
157 relocated. */
158 bfd_reloc_status_type
_bfd_aarch64_elf_put_addend(bfd * abfd,bfd_byte * address,bfd_reloc_code_real_type r_type,reloc_howto_type * howto,bfd_signed_vma addend)159 _bfd_aarch64_elf_put_addend (bfd *abfd,
160 bfd_byte *address, bfd_reloc_code_real_type r_type,
161 reloc_howto_type *howto, bfd_signed_vma addend)
162 {
163 bfd_reloc_status_type status = bfd_reloc_ok;
164 bfd_signed_vma old_addend = addend;
165 bfd_vma contents;
166 int size;
167
168 size = bfd_get_reloc_size (howto);
169 switch (size)
170 {
171 case 0:
172 return status;
173 case 2:
174 contents = bfd_get_16 (abfd, address);
175 break;
176 case 4:
177 if (howto->src_mask != 0xffffffff)
178 /* Must be 32-bit instruction, always little-endian. */
179 contents = bfd_getl32 (address);
180 else
181 /* Must be 32-bit data (endianness dependent). */
182 contents = bfd_get_32 (abfd, address);
183 break;
184 case 8:
185 contents = bfd_get_64 (abfd, address);
186 break;
187 default:
188 abort ();
189 }
190
191 switch (howto->complain_on_overflow)
192 {
193 case complain_overflow_dont:
194 break;
195 case complain_overflow_signed:
196 status = aarch64_signed_overflow (addend,
197 howto->bitsize + howto->rightshift);
198 break;
199 case complain_overflow_unsigned:
200 status = aarch64_unsigned_overflow (addend,
201 howto->bitsize + howto->rightshift);
202 break;
203 case complain_overflow_bitfield:
204 default:
205 abort ();
206 }
207
208 addend >>= howto->rightshift;
209
210 switch (r_type)
211 {
212 case BFD_RELOC_AARCH64_CALL26:
213 case BFD_RELOC_AARCH64_JUMP26:
214 contents = reencode_branch_ofs_26 (contents, addend);
215 break;
216
217 case BFD_RELOC_AARCH64_BRANCH19:
218 contents = reencode_cond_branch_ofs_19 (contents, addend);
219 break;
220
221 case BFD_RELOC_AARCH64_TSTBR14:
222 contents = reencode_tst_branch_ofs_14 (contents, addend);
223 break;
224
225 case BFD_RELOC_AARCH64_GOT_LD_PREL19:
226 case BFD_RELOC_AARCH64_LD_LO19_PCREL:
227 case BFD_RELOC_AARCH64_TLSDESC_LD_PREL19:
228 case BFD_RELOC_AARCH64_TLSIE_LD_GOTTPREL_PREL19:
229 if (old_addend & ((1 << howto->rightshift) - 1))
230 return bfd_reloc_overflow;
231 contents = reencode_ld_lit_ofs_19 (contents, addend);
232 break;
233
234 case BFD_RELOC_AARCH64_TLSDESC_CALL:
235 break;
236
237 case BFD_RELOC_AARCH64_ADR_GOT_PAGE:
238 case BFD_RELOC_AARCH64_ADR_HI21_NC_PCREL:
239 case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
240 case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
241 case BFD_RELOC_AARCH64_TLSDESC_ADR_PAGE21:
242 case BFD_RELOC_AARCH64_TLSDESC_ADR_PREL21:
243 case BFD_RELOC_AARCH64_TLSGD_ADR_PAGE21:
244 case BFD_RELOC_AARCH64_TLSGD_ADR_PREL21:
245 case BFD_RELOC_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
246 case BFD_RELOC_AARCH64_TLSLD_ADR_PAGE21:
247 case BFD_RELOC_AARCH64_TLSLD_ADR_PREL21:
248 contents = _bfd_aarch64_reencode_adr_imm (contents, addend);
249 break;
250
251 case BFD_RELOC_AARCH64_ADD_LO12:
252 case BFD_RELOC_AARCH64_TLSDESC_ADD_LO12:
253 case BFD_RELOC_AARCH64_TLSGD_ADD_LO12_NC:
254 case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_HI12:
255 case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12:
256 case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
257 case BFD_RELOC_AARCH64_TLSLD_ADD_LO12_NC:
258 case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_HI12:
259 case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12:
260 case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
261 /* Corresponds to: add rd, rn, #uimm12 to provide the low order
262 12 bits of the page offset following
263 BFD_RELOC_AARCH64_ADR_HI21_PCREL which computes the
264 (pc-relative) page base. */
265 contents = reencode_add_imm (contents, addend);
266 break;
267
268 case BFD_RELOC_AARCH64_LD32_GOTPAGE_LO14:
269 case BFD_RELOC_AARCH64_LD32_GOT_LO12_NC:
270 case BFD_RELOC_AARCH64_LD64_GOTOFF_LO15:
271 case BFD_RELOC_AARCH64_LD64_GOTPAGE_LO15:
272 case BFD_RELOC_AARCH64_LD64_GOT_LO12_NC:
273 case BFD_RELOC_AARCH64_LDST128_LO12:
274 case BFD_RELOC_AARCH64_LDST16_LO12:
275 case BFD_RELOC_AARCH64_LDST32_LO12:
276 case BFD_RELOC_AARCH64_LDST64_LO12:
277 case BFD_RELOC_AARCH64_LDST8_LO12:
278 case BFD_RELOC_AARCH64_TLSDESC_LD32_LO12_NC:
279 case BFD_RELOC_AARCH64_TLSDESC_LD64_LO12:
280 case BFD_RELOC_AARCH64_TLSIE_LD32_GOTTPREL_LO12_NC:
281 case BFD_RELOC_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
282 case BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12:
283 case BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC:
284 case BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12:
285 case BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC:
286 case BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12:
287 case BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC:
288 case BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12:
289 case BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC:
290 case BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12:
291 case BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12_NC:
292 case BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12:
293 case BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12_NC:
294 case BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12:
295 case BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12_NC:
296 case BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12:
297 case BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12_NC:
298 if (old_addend & ((1 << howto->rightshift) - 1))
299 return bfd_reloc_overflow;
300 /* Used for ldr*|str* rt, [rn, #uimm12] to provide the low order
301 12 bits address offset. */
302 contents = reencode_ldst_pos_imm (contents, addend);
303 break;
304
305 /* Group relocations to create high bits of a 16, 32, 48 or 64
306 bit signed data or abs address inline. Will change
307 instruction to MOVN or MOVZ depending on sign of calculated
308 value. */
309
310 case BFD_RELOC_AARCH64_MOVW_G0_S:
311 case BFD_RELOC_AARCH64_MOVW_G1_S:
312 case BFD_RELOC_AARCH64_MOVW_G2_S:
313 case BFD_RELOC_AARCH64_MOVW_PREL_G0:
314 case BFD_RELOC_AARCH64_MOVW_PREL_G1:
315 case BFD_RELOC_AARCH64_MOVW_PREL_G2:
316 case BFD_RELOC_AARCH64_MOVW_PREL_G3:
317 case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0:
318 case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1:
319 case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G2:
320 case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0:
321 case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1:
322 case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G2:
323 /* NOTE: We can only come here with movz or movn. */
324 if (addend < 0)
325 {
326 /* Force use of MOVN. */
327 addend = ~addend;
328 contents = reencode_movzn_to_movn (contents);
329 }
330 else
331 {
332 /* Force use of MOVZ. */
333 contents = reencode_movzn_to_movz (contents);
334 }
335 /* Fall through. */
336
337 /* Group relocations to create a 16, 32, 48 or 64 bit unsigned
338 data or abs address inline. */
339
340 case BFD_RELOC_AARCH64_MOVW_G0:
341 case BFD_RELOC_AARCH64_MOVW_G0_NC:
342 case BFD_RELOC_AARCH64_MOVW_G1:
343 case BFD_RELOC_AARCH64_MOVW_G1_NC:
344 case BFD_RELOC_AARCH64_MOVW_G2:
345 case BFD_RELOC_AARCH64_MOVW_G2_NC:
346 case BFD_RELOC_AARCH64_MOVW_G3:
347 case BFD_RELOC_AARCH64_MOVW_GOTOFF_G0_NC:
348 case BFD_RELOC_AARCH64_MOVW_GOTOFF_G1:
349 case BFD_RELOC_AARCH64_MOVW_PREL_G0_NC:
350 case BFD_RELOC_AARCH64_MOVW_PREL_G1_NC:
351 case BFD_RELOC_AARCH64_MOVW_PREL_G2_NC:
352 case BFD_RELOC_AARCH64_TLSDESC_OFF_G0_NC:
353 case BFD_RELOC_AARCH64_TLSDESC_OFF_G1:
354 case BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC:
355 case BFD_RELOC_AARCH64_TLSGD_MOVW_G1:
356 case BFD_RELOC_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC:
357 case BFD_RELOC_AARCH64_TLSIE_MOVW_GOTTPREL_G1:
358 case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
359 case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1_NC:
360 case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
361 case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
362 contents = reencode_movw_imm (contents, addend);
363 break;
364
365 default:
366 /* Repack simple data */
367 if (howto->dst_mask & (howto->dst_mask + 1))
368 return bfd_reloc_notsupported;
369
370 contents = ((contents & ~howto->dst_mask) | (addend & howto->dst_mask));
371 break;
372 }
373
374 switch (size)
375 {
376 case 2:
377 bfd_put_16 (abfd, contents, address);
378 break;
379 case 4:
380 if (howto->dst_mask != 0xffffffff)
381 /* must be 32-bit instruction, always little-endian */
382 bfd_putl32 (contents, address);
383 else
384 /* must be 32-bit data (endianness dependent) */
385 bfd_put_32 (abfd, contents, address);
386 break;
387 case 8:
388 bfd_put_64 (abfd, contents, address);
389 break;
390 default:
391 abort ();
392 }
393
394 return status;
395 }
396
397 bfd_vma
_bfd_aarch64_elf_resolve_relocation(bfd * input_bfd,bfd_reloc_code_real_type r_type,bfd_vma place,bfd_vma value,bfd_vma addend,bool weak_undef_p)398 _bfd_aarch64_elf_resolve_relocation (bfd *input_bfd,
399 bfd_reloc_code_real_type r_type,
400 bfd_vma place, bfd_vma value,
401 bfd_vma addend, bool weak_undef_p)
402 {
403 bool tls_reloc = true;
404 switch (r_type)
405 {
406 case BFD_RELOC_AARCH64_NONE:
407 case BFD_RELOC_AARCH64_TLSDESC_CALL:
408 break;
409
410 case BFD_RELOC_AARCH64_16_PCREL:
411 case BFD_RELOC_AARCH64_32_PCREL:
412 case BFD_RELOC_AARCH64_64_PCREL:
413 case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
414 case BFD_RELOC_AARCH64_BRANCH19:
415 case BFD_RELOC_AARCH64_LD_LO19_PCREL:
416 case BFD_RELOC_AARCH64_MOVW_PREL_G0:
417 case BFD_RELOC_AARCH64_MOVW_PREL_G0_NC:
418 case BFD_RELOC_AARCH64_MOVW_PREL_G1:
419 case BFD_RELOC_AARCH64_MOVW_PREL_G1_NC:
420 case BFD_RELOC_AARCH64_MOVW_PREL_G2:
421 case BFD_RELOC_AARCH64_MOVW_PREL_G2_NC:
422 case BFD_RELOC_AARCH64_MOVW_PREL_G3:
423 case BFD_RELOC_AARCH64_TLSDESC_ADR_PREL21:
424 case BFD_RELOC_AARCH64_TLSDESC_LD_PREL19:
425 case BFD_RELOC_AARCH64_TLSGD_ADR_PREL21:
426 case BFD_RELOC_AARCH64_TLSIE_LD_GOTTPREL_PREL19:
427 case BFD_RELOC_AARCH64_TLSLD_ADR_PREL21:
428 case BFD_RELOC_AARCH64_TSTBR14:
429 if (weak_undef_p)
430 value = place;
431 value = value + addend - place;
432 break;
433
434 case BFD_RELOC_AARCH64_CALL26:
435 case BFD_RELOC_AARCH64_JUMP26:
436 value = value + addend - place;
437 break;
438
439 case BFD_RELOC_AARCH64_16:
440 case BFD_RELOC_AARCH64_32:
441 case BFD_RELOC_AARCH64_MOVW_G0:
442 case BFD_RELOC_AARCH64_MOVW_G0_NC:
443 case BFD_RELOC_AARCH64_MOVW_G0_S:
444 case BFD_RELOC_AARCH64_MOVW_G1:
445 case BFD_RELOC_AARCH64_MOVW_G1_NC:
446 case BFD_RELOC_AARCH64_MOVW_G1_S:
447 case BFD_RELOC_AARCH64_MOVW_G2:
448 case BFD_RELOC_AARCH64_MOVW_G2_NC:
449 case BFD_RELOC_AARCH64_MOVW_G2_S:
450 case BFD_RELOC_AARCH64_MOVW_G3:
451 tls_reloc = false;
452 /* fall-through. */
453 case BFD_RELOC_AARCH64_TLSDESC_OFF_G0_NC:
454 case BFD_RELOC_AARCH64_TLSDESC_OFF_G1:
455 case BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC:
456 case BFD_RELOC_AARCH64_TLSGD_MOVW_G1:
457 case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_HI12:
458 case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12:
459 case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
460 case BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12:
461 case BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12:
462 case BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12:
463 case BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12:
464 case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0:
465 case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
466 case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1:
467 case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1_NC:
468 case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G2:
469 case BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12:
470 case BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12:
471 case BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12:
472 case BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12:
473 /* Weak Symbols and TLS relocations are implementation defined. For this
474 case we choose to emit 0. */
475 if (weak_undef_p && tls_reloc)
476 {
477 _bfd_error_handler (_("%pB: warning: Weak TLS is implementation "
478 "defined and may not work as expected"),
479 input_bfd);
480 value = place;
481 }
482 value = value + addend;
483 break;
484
485 case BFD_RELOC_AARCH64_ADR_HI21_NC_PCREL:
486 case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
487 if (weak_undef_p)
488 value = PG (place);
489 value = PG (value + addend) - PG (place);
490 break;
491
492 case BFD_RELOC_AARCH64_GOT_LD_PREL19:
493 value = value + addend - place;
494 break;
495
496 case BFD_RELOC_AARCH64_ADR_GOT_PAGE:
497 case BFD_RELOC_AARCH64_TLSDESC_ADR_PAGE21:
498 case BFD_RELOC_AARCH64_TLSGD_ADR_PAGE21:
499 case BFD_RELOC_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
500 case BFD_RELOC_AARCH64_TLSLD_ADR_PAGE21:
501 value = PG (value + addend) - PG (place);
502 break;
503
504 /* Caller must make sure addend is the base address of .got section. */
505 case BFD_RELOC_AARCH64_LD32_GOTPAGE_LO14:
506 case BFD_RELOC_AARCH64_LD64_GOTPAGE_LO15:
507 addend = PG (addend);
508 /* Fall through. */
509 case BFD_RELOC_AARCH64_LD64_GOTOFF_LO15:
510 case BFD_RELOC_AARCH64_MOVW_GOTOFF_G0_NC:
511 case BFD_RELOC_AARCH64_MOVW_GOTOFF_G1:
512 value = value - addend;
513 break;
514
515 case BFD_RELOC_AARCH64_ADD_LO12:
516 case BFD_RELOC_AARCH64_LD32_GOT_LO12_NC:
517 case BFD_RELOC_AARCH64_LD64_GOT_LO12_NC:
518 case BFD_RELOC_AARCH64_LDST128_LO12:
519 case BFD_RELOC_AARCH64_LDST16_LO12:
520 case BFD_RELOC_AARCH64_LDST32_LO12:
521 case BFD_RELOC_AARCH64_LDST64_LO12:
522 case BFD_RELOC_AARCH64_LDST8_LO12:
523 case BFD_RELOC_AARCH64_TLSDESC_ADD:
524 case BFD_RELOC_AARCH64_TLSDESC_ADD_LO12:
525 case BFD_RELOC_AARCH64_TLSDESC_LD32_LO12_NC:
526 case BFD_RELOC_AARCH64_TLSDESC_LD64_LO12:
527 case BFD_RELOC_AARCH64_TLSDESC_LDR:
528 case BFD_RELOC_AARCH64_TLSGD_ADD_LO12_NC:
529 case BFD_RELOC_AARCH64_TLSIE_LD32_GOTTPREL_LO12_NC:
530 case BFD_RELOC_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
531 case BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC:
532 case BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC:
533 case BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC:
534 case BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC:
535 case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
536 case BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12_NC:
537 case BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12_NC:
538 case BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12_NC:
539 case BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12_NC:
540 value = PG_OFFSET (value + addend);
541 break;
542
543 case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12:
544 value = value + addend;
545 break;
546
547 case BFD_RELOC_AARCH64_TLSIE_MOVW_GOTTPREL_G1:
548 case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1:
549 case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
550 value = (value + addend) & (bfd_vma) 0xffff0000;
551 break;
552 case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_HI12:
553 /* Mask off low 12bits, keep all other high bits, so that the later
554 generic code could check whehter there is overflow. */
555 value = (value + addend) & ~(bfd_vma) 0xfff;
556 break;
557
558 case BFD_RELOC_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC:
559 case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0:
560 case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
561 value = (value + addend) & (bfd_vma) 0xffff;
562 break;
563
564 case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G2:
565 value = (value + addend) & ~(bfd_vma) 0xffffffff;
566 value -= place & ~(bfd_vma) 0xffffffff;
567 break;
568
569 default:
570 break;
571 }
572
573 return value;
574 }
575
576 /* Support for core dump NOTE sections. */
577
578 bool
_bfd_aarch64_elf_grok_prstatus(bfd * abfd,Elf_Internal_Note * note)579 _bfd_aarch64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
580 {
581 int offset;
582 size_t size;
583
584 switch (note->descsz)
585 {
586 default:
587 return false;
588
589 case 392: /* sizeof(struct elf_prstatus) on Linux/arm64. */
590 /* pr_cursig */
591 elf_tdata (abfd)->core->signal
592 = bfd_get_16 (abfd, note->descdata + 12);
593
594 /* pr_pid */
595 elf_tdata (abfd)->core->lwpid
596 = bfd_get_32 (abfd, note->descdata + 32);
597
598 /* pr_reg */
599 offset = 112;
600 size = 272;
601
602 break;
603 }
604
605 /* Make a ".reg/999" section. */
606 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
607 size, note->descpos + offset);
608 }
609
610 bool
_bfd_aarch64_elf_grok_psinfo(bfd * abfd,Elf_Internal_Note * note)611 _bfd_aarch64_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
612 {
613 switch (note->descsz)
614 {
615 default:
616 return false;
617
618 case 136: /* This is sizeof(struct elf_prpsinfo) on Linux/aarch64. */
619 elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, note->descdata + 24);
620 elf_tdata (abfd)->core->program
621 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
622 elf_tdata (abfd)->core->command
623 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
624 }
625
626 /* Note that for some reason, a spurious space is tacked
627 onto the end of the args in some (at least one anyway)
628 implementations, so strip it off if it exists. */
629
630 {
631 char *command = elf_tdata (abfd)->core->command;
632 int n = strlen (command);
633
634 if (0 < n && command[n - 1] == ' ')
635 command[n - 1] = '\0';
636 }
637
638 return true;
639 }
640
641 char *
_bfd_aarch64_elf_write_core_note(bfd * abfd,char * buf,int * bufsiz,int note_type,...)642 _bfd_aarch64_elf_write_core_note (bfd *abfd, char *buf, int *bufsiz, int note_type,
643 ...)
644 {
645 switch (note_type)
646 {
647 default:
648 return NULL;
649
650 case NT_PRPSINFO:
651 {
652 char data[136] ATTRIBUTE_NONSTRING;
653 va_list ap;
654
655 va_start (ap, note_type);
656 memset (data, 0, sizeof (data));
657 strncpy (data + 40, va_arg (ap, const char *), 16);
658 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
659 DIAGNOSTIC_PUSH;
660 /* GCC 8.0 and 8.1 warn about 80 equals destination size with
661 -Wstringop-truncation:
662 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643
663 */
664 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION;
665 #endif
666 strncpy (data + 56, va_arg (ap, const char *), 80);
667 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
668 DIAGNOSTIC_POP;
669 #endif
670 va_end (ap);
671
672 return elfcore_write_note (abfd, buf, bufsiz, "CORE",
673 note_type, data, sizeof (data));
674 }
675
676 case NT_PRSTATUS:
677 {
678 char data[392];
679 va_list ap;
680 long pid;
681 int cursig;
682 const void *greg;
683
684 va_start (ap, note_type);
685 memset (data, 0, sizeof (data));
686 pid = va_arg (ap, long);
687 bfd_put_32 (abfd, pid, data + 32);
688 cursig = va_arg (ap, int);
689 bfd_put_16 (abfd, cursig, data + 12);
690 greg = va_arg (ap, const void *);
691 memcpy (data + 112, greg, 272);
692 va_end (ap);
693
694 return elfcore_write_note (abfd, buf, bufsiz, "CORE",
695 note_type, data, sizeof (data));
696 }
697 }
698 }
699
700 /* Find the first input bfd with GNU property and merge it with GPROP. If no
701 such input is found, add it to a new section at the last input. Update
702 GPROP accordingly. */
703 bfd *
_bfd_aarch64_elf_link_setup_gnu_properties(struct bfd_link_info * info,uint32_t * gprop)704 _bfd_aarch64_elf_link_setup_gnu_properties (struct bfd_link_info *info,
705 uint32_t *gprop)
706 {
707 asection *sec;
708 bfd *pbfd;
709 bfd *ebfd = NULL;
710 elf_property *prop;
711 unsigned align;
712
713 uint32_t gnu_prop = *gprop;
714
715 /* Find a normal input file with GNU property note. */
716 for (pbfd = info->input_bfds;
717 pbfd != NULL;
718 pbfd = pbfd->link.next)
719 if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour
720 && bfd_count_sections (pbfd) != 0)
721 {
722 ebfd = pbfd;
723
724 if (elf_properties (pbfd) != NULL)
725 break;
726 }
727
728 /* If ebfd != NULL it is either an input with property note or the last
729 input. Either way if we have gnu_prop, we should add it (by creating
730 a section if needed). */
731 if (ebfd != NULL && gnu_prop)
732 {
733 prop = _bfd_elf_get_property (ebfd,
734 GNU_PROPERTY_AARCH64_FEATURE_1_AND,
735 4);
736 if (gnu_prop & GNU_PROPERTY_AARCH64_FEATURE_1_BTI
737 && !(prop->u.number & GNU_PROPERTY_AARCH64_FEATURE_1_BTI))
738 _bfd_error_handler (_("%pB: warning: BTI turned on by -z force-bti "
739 "when all inputs do not have BTI in NOTE "
740 "section."), ebfd);
741 prop->u.number |= gnu_prop;
742 prop->pr_kind = property_number;
743
744 /* pbfd being NULL implies ebfd is the last input. Create the GNU
745 property note section. */
746 if (pbfd == NULL)
747 {
748 sec = bfd_make_section_with_flags (ebfd,
749 NOTE_GNU_PROPERTY_SECTION_NAME,
750 (SEC_ALLOC
751 | SEC_LOAD
752 | SEC_IN_MEMORY
753 | SEC_READONLY
754 | SEC_HAS_CONTENTS
755 | SEC_DATA));
756 if (sec == NULL)
757 info->callbacks->einfo (
758 _("%F%P: failed to create GNU property section\n"));
759
760 align = (bfd_get_mach (ebfd) & bfd_mach_aarch64_ilp32) ? 2 : 3;
761 if (!bfd_set_section_alignment (sec, align))
762 info->callbacks->einfo (_("%F%pA: failed to align section\n"),
763 sec);
764
765 elf_section_type (sec) = SHT_NOTE;
766 }
767 }
768
769 pbfd = _bfd_elf_link_setup_gnu_properties (info);
770
771 if (bfd_link_relocatable (info))
772 return pbfd;
773
774 /* If pbfd has any GNU_PROPERTY_AARCH64_FEATURE_1_AND properties, update
775 gnu_prop accordingly. */
776 if (pbfd != NULL)
777 {
778 elf_property_list *p;
779
780 /* The property list is sorted in order of type. */
781 for (p = elf_properties (pbfd); p; p = p->next)
782 {
783 /* Check for all GNU_PROPERTY_AARCH64_FEATURE_1_AND. */
784 if (GNU_PROPERTY_AARCH64_FEATURE_1_AND == p->property.pr_type)
785 {
786 gnu_prop = (p->property.u.number
787 & (GNU_PROPERTY_AARCH64_FEATURE_1_PAC
788 | GNU_PROPERTY_AARCH64_FEATURE_1_BTI));
789 break;
790 }
791 else if (GNU_PROPERTY_AARCH64_FEATURE_1_AND < p->property.pr_type)
792 break;
793 }
794 }
795 *gprop = gnu_prop;
796 return pbfd;
797 }
798
799 /* Define elf_backend_parse_gnu_properties for AArch64. */
800 enum elf_property_kind
_bfd_aarch64_elf_parse_gnu_properties(bfd * abfd,unsigned int type,bfd_byte * ptr,unsigned int datasz)801 _bfd_aarch64_elf_parse_gnu_properties (bfd *abfd, unsigned int type,
802 bfd_byte *ptr, unsigned int datasz)
803 {
804 elf_property *prop;
805
806 switch (type)
807 {
808 case GNU_PROPERTY_AARCH64_FEATURE_1_AND:
809 if (datasz != 4)
810 {
811 _bfd_error_handler
812 ( _("error: %pB: <corrupt AArch64 used size: 0x%x>"),
813 abfd, datasz);
814 return property_corrupt;
815 }
816 prop = _bfd_elf_get_property (abfd, type, datasz);
817 /* Combine properties of the same type. */
818 prop->u.number |= bfd_h_get_32 (abfd, ptr);
819 prop->pr_kind = property_number;
820 break;
821
822 default:
823 return property_ignored;
824 }
825
826 return property_number;
827 }
828
829 /* Merge AArch64 GNU property BPROP with APROP also accounting for PROP.
830 If APROP isn't NULL, merge it with BPROP and/or PROP. Vice-versa if BROP
831 isn't NULL. Return TRUE if there is any update to APROP or if BPROP should
832 be merge with ABFD. */
833 bool
_bfd_aarch64_elf_merge_gnu_properties(struct bfd_link_info * info ATTRIBUTE_UNUSED,bfd * abfd ATTRIBUTE_UNUSED,elf_property * aprop,elf_property * bprop,uint32_t prop)834 _bfd_aarch64_elf_merge_gnu_properties (struct bfd_link_info *info
835 ATTRIBUTE_UNUSED,
836 bfd *abfd ATTRIBUTE_UNUSED,
837 elf_property *aprop,
838 elf_property *bprop,
839 uint32_t prop)
840 {
841 unsigned int orig_number;
842 bool updated = false;
843 unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
844
845 switch (pr_type)
846 {
847 case GNU_PROPERTY_AARCH64_FEATURE_1_AND:
848 {
849 if (aprop != NULL && bprop != NULL)
850 {
851 orig_number = aprop->u.number;
852 aprop->u.number = (orig_number & bprop->u.number) | prop;
853 updated = orig_number != aprop->u.number;
854 /* Remove the property if all feature bits are cleared. */
855 if (aprop->u.number == 0)
856 aprop->pr_kind = property_remove;
857 break;
858 }
859 /* If either is NULL, the AND would be 0 so, if there is
860 any PROP, asign it to the input that is not NULL. */
861 if (prop)
862 {
863 if (aprop != NULL)
864 {
865 orig_number = aprop->u.number;
866 aprop->u.number = prop;
867 updated = orig_number != aprop->u.number;
868 }
869 else
870 {
871 bprop->u.number = prop;
872 updated = true;
873 }
874 }
875 /* No PROP and BPROP is NULL, so remove APROP. */
876 else if (aprop != NULL)
877 {
878 aprop->pr_kind = property_remove;
879 updated = true;
880 }
881 }
882 break;
883
884 default:
885 abort ();
886 }
887
888 return updated;
889 }
890
891 /* Fix up AArch64 GNU properties. */
892 void
_bfd_aarch64_elf_link_fixup_gnu_properties(struct bfd_link_info * info ATTRIBUTE_UNUSED,elf_property_list ** listp)893 _bfd_aarch64_elf_link_fixup_gnu_properties
894 (struct bfd_link_info *info ATTRIBUTE_UNUSED,
895 elf_property_list **listp)
896 {
897 elf_property_list *p, *prev;
898
899 for (p = *listp, prev = *listp; p; p = p->next)
900 {
901 unsigned int type = p->property.pr_type;
902 if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND)
903 {
904 if (p->property.pr_kind == property_remove)
905 {
906 /* Remove empty property. */
907 if (prev == p)
908 {
909 *listp = p->next;
910 prev = *listp;
911 }
912 else
913 prev->next = p->next;
914 continue;
915 }
916 prev = p;
917 }
918 else if (type > GNU_PROPERTY_HIPROC)
919 {
920 /* The property list is sorted in order of type. */
921 break;
922 }
923 }
924 }
925