1 /* Xilinx MicroBlaze-specific support for 32-bit ELF
2
3 Copyright (C) 2009-2016 Free Software Foundation, Inc.
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; if not, write to the
19 Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
20 Boston, MA 02110-1301, USA. */
21
22
23 int dbg = 0;
24
25 #include "sysdep.h"
26 #include "bfd.h"
27 #include "bfdlink.h"
28 #include "libbfd.h"
29 #include "elf-bfd.h"
30 #include "elf/microblaze.h"
31 #include <assert.h>
32
33 #define USE_RELA /* Only USE_REL is actually significant, but this is
34 here are a reminder... */
35 #define INST_WORD_SIZE 4
36
37 static int ro_small_data_pointer = 0;
38 static int rw_small_data_pointer = 0;
39
40 static reloc_howto_type * microblaze_elf_howto_table [(int) R_MICROBLAZE_max];
41
42 static reloc_howto_type microblaze_elf_howto_raw[] =
43 {
44 /* This reloc does nothing. */
45 HOWTO (R_MICROBLAZE_NONE, /* Type. */
46 0, /* Rightshift. */
47 3, /* Size (0 = byte, 1 = short, 2 = long). */
48 0, /* Bitsize. */
49 FALSE, /* PC_relative. */
50 0, /* Bitpos. */
51 complain_overflow_dont, /* Complain on overflow. */
52 NULL, /* Special Function. */
53 "R_MICROBLAZE_NONE", /* Name. */
54 FALSE, /* Partial Inplace. */
55 0, /* Source Mask. */
56 0, /* Dest Mask. */
57 FALSE), /* PC relative offset? */
58
59 /* A standard 32 bit relocation. */
60 HOWTO (R_MICROBLAZE_32, /* Type. */
61 0, /* Rightshift. */
62 2, /* Size (0 = byte, 1 = short, 2 = long). */
63 32, /* Bitsize. */
64 FALSE, /* PC_relative. */
65 0, /* Bitpos. */
66 complain_overflow_bitfield, /* Complain on overflow. */
67 bfd_elf_generic_reloc,/* Special Function. */
68 "R_MICROBLAZE_32", /* Name. */
69 FALSE, /* Partial Inplace. */
70 0, /* Source Mask. */
71 0xffffffff, /* Dest Mask. */
72 FALSE), /* PC relative offset? */
73
74 /* A standard PCREL 32 bit relocation. */
75 HOWTO (R_MICROBLAZE_32_PCREL,/* Type. */
76 0, /* Rightshift. */
77 2, /* Size (0 = byte, 1 = short, 2 = long). */
78 32, /* Bitsize. */
79 TRUE, /* PC_relative. */
80 0, /* Bitpos. */
81 complain_overflow_bitfield, /* Complain on overflow. */
82 bfd_elf_generic_reloc,/* Special Function. */
83 "R_MICROBLAZE_32_PCREL", /* Name. */
84 TRUE, /* Partial Inplace. */
85 0, /* Source Mask. */
86 0xffffffff, /* Dest Mask. */
87 TRUE), /* PC relative offset? */
88
89 /* A 64 bit PCREL relocation. Table-entry not really used. */
90 HOWTO (R_MICROBLAZE_64_PCREL,/* Type. */
91 0, /* Rightshift. */
92 2, /* Size (0 = byte, 1 = short, 2 = long). */
93 16, /* Bitsize. */
94 TRUE, /* PC_relative. */
95 0, /* Bitpos. */
96 complain_overflow_dont, /* Complain on overflow. */
97 bfd_elf_generic_reloc,/* Special Function. */
98 "R_MICROBLAZE_64_PCREL", /* Name. */
99 FALSE, /* Partial Inplace. */
100 0, /* Source Mask. */
101 0x0000ffff, /* Dest Mask. */
102 TRUE), /* PC relative offset? */
103
104 /* The low half of a PCREL 32 bit relocation. */
105 HOWTO (R_MICROBLAZE_32_PCREL_LO, /* Type. */
106 0, /* Rightshift. */
107 2, /* Size (0 = byte, 1 = short, 2 = long). */
108 16, /* Bitsize. */
109 TRUE, /* PC_relative. */
110 0, /* Bitpos. */
111 complain_overflow_signed, /* Complain on overflow. */
112 bfd_elf_generic_reloc, /* Special Function. */
113 "R_MICROBLAZE_32_PCREL_LO", /* Name. */
114 FALSE, /* Partial Inplace. */
115 0, /* Source Mask. */
116 0x0000ffff, /* Dest Mask. */
117 TRUE), /* PC relative offset? */
118
119 /* A 64 bit relocation. Table entry not really used. */
120 HOWTO (R_MICROBLAZE_64, /* Type. */
121 0, /* Rightshift. */
122 2, /* Size (0 = byte, 1 = short, 2 = long). */
123 16, /* Bitsize. */
124 FALSE, /* PC_relative. */
125 0, /* Bitpos. */
126 complain_overflow_dont, /* Complain on overflow. */
127 bfd_elf_generic_reloc,/* Special Function. */
128 "R_MICROBLAZE_64", /* Name. */
129 FALSE, /* Partial Inplace. */
130 0, /* Source Mask. */
131 0x0000ffff, /* Dest Mask. */
132 FALSE), /* PC relative offset? */
133
134 /* The low half of a 32 bit relocation. */
135 HOWTO (R_MICROBLAZE_32_LO, /* Type. */
136 0, /* Rightshift. */
137 2, /* Size (0 = byte, 1 = short, 2 = long). */
138 16, /* Bitsize. */
139 FALSE, /* PC_relative. */
140 0, /* Bitpos. */
141 complain_overflow_signed, /* Complain on overflow. */
142 bfd_elf_generic_reloc,/* Special Function. */
143 "R_MICROBLAZE_32_LO", /* Name. */
144 FALSE, /* Partial Inplace. */
145 0, /* Source Mask. */
146 0x0000ffff, /* Dest Mask. */
147 FALSE), /* PC relative offset? */
148
149 /* Read-only small data section relocation. */
150 HOWTO (R_MICROBLAZE_SRO32, /* Type. */
151 0, /* Rightshift. */
152 2, /* Size (0 = byte, 1 = short, 2 = long). */
153 16, /* Bitsize. */
154 FALSE, /* PC_relative. */
155 0, /* Bitpos. */
156 complain_overflow_bitfield, /* Complain on overflow. */
157 bfd_elf_generic_reloc,/* Special Function. */
158 "R_MICROBLAZE_SRO32", /* Name. */
159 FALSE, /* Partial Inplace. */
160 0, /* Source Mask. */
161 0x0000ffff, /* Dest Mask. */
162 FALSE), /* PC relative offset? */
163
164 /* Read-write small data area relocation. */
165 HOWTO (R_MICROBLAZE_SRW32, /* Type. */
166 0, /* Rightshift. */
167 2, /* Size (0 = byte, 1 = short, 2 = long). */
168 16, /* Bitsize. */
169 FALSE, /* PC_relative. */
170 0, /* Bitpos. */
171 complain_overflow_bitfield, /* Complain on overflow. */
172 bfd_elf_generic_reloc,/* Special Function. */
173 "R_MICROBLAZE_SRW32", /* Name. */
174 FALSE, /* Partial Inplace. */
175 0, /* Source Mask. */
176 0x0000ffff, /* Dest Mask. */
177 FALSE), /* PC relative offset? */
178
179 /* This reloc does nothing. Used for relaxation. */
180 HOWTO (R_MICROBLAZE_64_NONE, /* Type. */
181 0, /* Rightshift. */
182 3, /* Size (0 = byte, 1 = short, 2 = long). */
183 0, /* Bitsize. */
184 TRUE, /* PC_relative. */
185 0, /* Bitpos. */
186 complain_overflow_dont, /* Complain on overflow. */
187 NULL, /* Special Function. */
188 "R_MICROBLAZE_64_NONE",/* Name. */
189 FALSE, /* Partial Inplace. */
190 0, /* Source Mask. */
191 0, /* Dest Mask. */
192 FALSE), /* PC relative offset? */
193
194 /* Symbol Op Symbol relocation. */
195 HOWTO (R_MICROBLAZE_32_SYM_OP_SYM, /* Type. */
196 0, /* Rightshift. */
197 2, /* Size (0 = byte, 1 = short, 2 = long). */
198 32, /* Bitsize. */
199 FALSE, /* PC_relative. */
200 0, /* Bitpos. */
201 complain_overflow_bitfield, /* Complain on overflow. */
202 bfd_elf_generic_reloc,/* Special Function. */
203 "R_MICROBLAZE_32_SYM_OP_SYM", /* Name. */
204 FALSE, /* Partial Inplace. */
205 0, /* Source Mask. */
206 0xffffffff, /* Dest Mask. */
207 FALSE), /* PC relative offset? */
208
209 /* GNU extension to record C++ vtable hierarchy. */
210 HOWTO (R_MICROBLAZE_GNU_VTINHERIT, /* Type. */
211 0, /* Rightshift. */
212 2, /* Size (0 = byte, 1 = short, 2 = long). */
213 0, /* Bitsize. */
214 FALSE, /* PC_relative. */
215 0, /* Bitpos. */
216 complain_overflow_dont,/* Complain on overflow. */
217 NULL, /* Special Function. */
218 "R_MICROBLAZE_GNU_VTINHERIT", /* Name. */
219 FALSE, /* Partial Inplace. */
220 0, /* Source Mask. */
221 0, /* Dest Mask. */
222 FALSE), /* PC relative offset? */
223
224 /* GNU extension to record C++ vtable member usage. */
225 HOWTO (R_MICROBLAZE_GNU_VTENTRY, /* Type. */
226 0, /* Rightshift. */
227 2, /* Size (0 = byte, 1 = short, 2 = long). */
228 0, /* Bitsize. */
229 FALSE, /* PC_relative. */
230 0, /* Bitpos. */
231 complain_overflow_dont,/* Complain on overflow. */
232 _bfd_elf_rel_vtable_reloc_fn, /* Special Function. */
233 "R_MICROBLAZE_GNU_VTENTRY", /* Name. */
234 FALSE, /* Partial Inplace. */
235 0, /* Source Mask. */
236 0, /* Dest Mask. */
237 FALSE), /* PC relative offset? */
238
239 /* A 64 bit GOTPC relocation. Table-entry not really used. */
240 HOWTO (R_MICROBLAZE_GOTPC_64, /* Type. */
241 0, /* Rightshift. */
242 2, /* Size (0 = byte, 1 = short, 2 = long). */
243 16, /* Bitsize. */
244 TRUE, /* PC_relative. */
245 0, /* Bitpos. */
246 complain_overflow_dont, /* Complain on overflow. */
247 bfd_elf_generic_reloc, /* Special Function. */
248 "R_MICROBLAZE_GOTPC_64", /* Name. */
249 FALSE, /* Partial Inplace. */
250 0, /* Source Mask. */
251 0x0000ffff, /* Dest Mask. */
252 TRUE), /* PC relative offset? */
253
254 /* A 64 bit GOT relocation. Table-entry not really used. */
255 HOWTO (R_MICROBLAZE_GOT_64, /* Type. */
256 0, /* Rightshift. */
257 2, /* Size (0 = byte, 1 = short, 2 = long). */
258 16, /* Bitsize. */
259 FALSE, /* PC_relative. */
260 0, /* Bitpos. */
261 complain_overflow_dont, /* Complain on overflow. */
262 bfd_elf_generic_reloc,/* Special Function. */
263 "R_MICROBLAZE_GOT_64",/* Name. */
264 FALSE, /* Partial Inplace. */
265 0, /* Source Mask. */
266 0x0000ffff, /* Dest Mask. */
267 FALSE), /* PC relative offset? */
268
269 /* A 64 bit PLT relocation. Table-entry not really used. */
270 HOWTO (R_MICROBLAZE_PLT_64, /* Type. */
271 0, /* Rightshift. */
272 2, /* Size (0 = byte, 1 = short, 2 = long). */
273 16, /* Bitsize. */
274 TRUE, /* PC_relative. */
275 0, /* Bitpos. */
276 complain_overflow_dont, /* Complain on overflow. */
277 bfd_elf_generic_reloc,/* Special Function. */
278 "R_MICROBLAZE_PLT_64",/* Name. */
279 FALSE, /* Partial Inplace. */
280 0, /* Source Mask. */
281 0x0000ffff, /* Dest Mask. */
282 TRUE), /* PC relative offset? */
283
284 /* Table-entry not really used. */
285 HOWTO (R_MICROBLAZE_REL, /* Type. */
286 0, /* Rightshift. */
287 2, /* Size (0 = byte, 1 = short, 2 = long). */
288 16, /* Bitsize. */
289 TRUE, /* PC_relative. */
290 0, /* Bitpos. */
291 complain_overflow_dont, /* Complain on overflow. */
292 bfd_elf_generic_reloc,/* Special Function. */
293 "R_MICROBLAZE_REL", /* Name. */
294 FALSE, /* Partial Inplace. */
295 0, /* Source Mask. */
296 0x0000ffff, /* Dest Mask. */
297 TRUE), /* PC relative offset? */
298
299 /* Table-entry not really used. */
300 HOWTO (R_MICROBLAZE_JUMP_SLOT,/* Type. */
301 0, /* Rightshift. */
302 2, /* Size (0 = byte, 1 = short, 2 = long). */
303 16, /* Bitsize. */
304 TRUE, /* PC_relative. */
305 0, /* Bitpos. */
306 complain_overflow_dont, /* Complain on overflow. */
307 bfd_elf_generic_reloc,/* Special Function. */
308 "R_MICROBLAZE_JUMP_SLOT", /* Name. */
309 FALSE, /* Partial Inplace. */
310 0, /* Source Mask. */
311 0x0000ffff, /* Dest Mask. */
312 TRUE), /* PC relative offset? */
313
314 /* Table-entry not really used. */
315 HOWTO (R_MICROBLAZE_GLOB_DAT,/* Type. */
316 0, /* Rightshift. */
317 2, /* Size (0 = byte, 1 = short, 2 = long). */
318 16, /* Bitsize. */
319 TRUE, /* PC_relative. */
320 0, /* Bitpos. */
321 complain_overflow_dont, /* Complain on overflow. */
322 bfd_elf_generic_reloc,/* Special Function. */
323 "R_MICROBLAZE_GLOB_DAT", /* Name. */
324 FALSE, /* Partial Inplace. */
325 0, /* Source Mask. */
326 0x0000ffff, /* Dest Mask. */
327 TRUE), /* PC relative offset? */
328
329 /* A 64 bit GOT relative relocation. Table-entry not really used. */
330 HOWTO (R_MICROBLAZE_GOTOFF_64, /* Type. */
331 0, /* Rightshift. */
332 2, /* Size (0 = byte, 1 = short, 2 = long). */
333 16, /* Bitsize. */
334 FALSE, /* PC_relative. */
335 0, /* Bitpos. */
336 complain_overflow_dont, /* Complain on overflow. */
337 bfd_elf_generic_reloc,/* Special Function. */
338 "R_MICROBLAZE_GOTOFF_64", /* Name. */
339 FALSE, /* Partial Inplace. */
340 0, /* Source Mask. */
341 0x0000ffff, /* Dest Mask. */
342 FALSE), /* PC relative offset? */
343
344 /* A 32 bit GOT relative relocation. Table-entry not really used. */
345 HOWTO (R_MICROBLAZE_GOTOFF_32, /* Type. */
346 0, /* Rightshift. */
347 2, /* Size (0 = byte, 1 = short, 2 = long). */
348 16, /* Bitsize. */
349 FALSE, /* PC_relative. */
350 0, /* Bitpos. */
351 complain_overflow_dont, /* Complain on overflow. */
352 bfd_elf_generic_reloc, /* Special Function. */
353 "R_MICROBLAZE_GOTOFF_32", /* Name. */
354 FALSE, /* Partial Inplace. */
355 0, /* Source Mask. */
356 0x0000ffff, /* Dest Mask. */
357 FALSE), /* PC relative offset? */
358
359 /* COPY relocation. Table-entry not really used. */
360 HOWTO (R_MICROBLAZE_COPY, /* Type. */
361 0, /* Rightshift. */
362 2, /* Size (0 = byte, 1 = short, 2 = long). */
363 16, /* Bitsize. */
364 FALSE, /* PC_relative. */
365 0, /* Bitpos. */
366 complain_overflow_dont, /* Complain on overflow. */
367 bfd_elf_generic_reloc,/* Special Function. */
368 "R_MICROBLAZE_COPY", /* Name. */
369 FALSE, /* Partial Inplace. */
370 0, /* Source Mask. */
371 0x0000ffff, /* Dest Mask. */
372 FALSE), /* PC relative offset? */
373
374 /* Marker relocs for TLS. */
375 HOWTO (R_MICROBLAZE_TLS,
376 0, /* rightshift */
377 2, /* size (0 = byte, 1 = short, 2 = long) */
378 32, /* bitsize */
379 FALSE, /* pc_relative */
380 0, /* bitpos */
381 complain_overflow_dont, /* complain_on_overflow */
382 bfd_elf_generic_reloc, /* special_function */
383 "R_MICROBLAZE_TLS", /* name */
384 FALSE, /* partial_inplace */
385 0, /* src_mask */
386 0x0000ffff, /* dst_mask */
387 FALSE), /* pcrel_offset */
388
389 HOWTO (R_MICROBLAZE_TLSGD,
390 0, /* rightshift */
391 2, /* size (0 = byte, 1 = short, 2 = long) */
392 32, /* bitsize */
393 FALSE, /* pc_relative */
394 0, /* bitpos */
395 complain_overflow_dont, /* complain_on_overflow */
396 bfd_elf_generic_reloc, /* special_function */
397 "R_MICROBLAZE_TLSGD", /* name */
398 FALSE, /* partial_inplace */
399 0, /* src_mask */
400 0x0000ffff, /* dst_mask */
401 FALSE), /* pcrel_offset */
402
403 HOWTO (R_MICROBLAZE_TLSLD,
404 0, /* rightshift */
405 2, /* size (0 = byte, 1 = short, 2 = long) */
406 32, /* bitsize */
407 FALSE, /* pc_relative */
408 0, /* bitpos */
409 complain_overflow_dont, /* complain_on_overflow */
410 bfd_elf_generic_reloc, /* special_function */
411 "R_MICROBLAZE_TLSLD", /* name */
412 FALSE, /* partial_inplace */
413 0, /* src_mask */
414 0x0000ffff, /* dst_mask */
415 FALSE), /* pcrel_offset */
416
417 /* Computes the load module index of the load module that contains the
418 definition of its TLS sym. */
419 HOWTO (R_MICROBLAZE_TLSDTPMOD32,
420 0, /* rightshift */
421 2, /* size (0 = byte, 1 = short, 2 = long) */
422 32, /* bitsize */
423 FALSE, /* pc_relative */
424 0, /* bitpos */
425 complain_overflow_dont, /* complain_on_overflow */
426 bfd_elf_generic_reloc, /* special_function */
427 "R_MICROBLAZE_TLSDTPMOD32", /* name */
428 FALSE, /* partial_inplace */
429 0, /* src_mask */
430 0x0000ffff, /* dst_mask */
431 FALSE), /* pcrel_offset */
432
433 /* Computes a dtv-relative displacement, the difference between the value
434 of sym+add and the base address of the thread-local storage block that
435 contains the definition of sym, minus 0x8000. Used for initializing GOT */
436 HOWTO (R_MICROBLAZE_TLSDTPREL32,
437 0, /* rightshift */
438 2, /* size (0 = byte, 1 = short, 2 = long) */
439 32, /* bitsize */
440 FALSE, /* pc_relative */
441 0, /* bitpos */
442 complain_overflow_dont, /* complain_on_overflow */
443 bfd_elf_generic_reloc, /* special_function */
444 "R_MICROBLAZE_TLSDTPREL32", /* name */
445 FALSE, /* partial_inplace */
446 0, /* src_mask */
447 0x0000ffff, /* dst_mask */
448 FALSE), /* pcrel_offset */
449
450 /* Computes a dtv-relative displacement, the difference between the value
451 of sym+add and the base address of the thread-local storage block that
452 contains the definition of sym, minus 0x8000. */
453 HOWTO (R_MICROBLAZE_TLSDTPREL64,
454 0, /* rightshift */
455 2, /* size (0 = byte, 1 = short, 2 = long) */
456 32, /* bitsize */
457 FALSE, /* pc_relative */
458 0, /* bitpos */
459 complain_overflow_dont, /* complain_on_overflow */
460 bfd_elf_generic_reloc, /* special_function */
461 "R_MICROBLAZE_TLSDTPREL64", /* name */
462 FALSE, /* partial_inplace */
463 0, /* src_mask */
464 0x0000ffff, /* dst_mask */
465 FALSE), /* pcrel_offset */
466
467 /* Computes a tp-relative displacement, the difference between the value of
468 sym+add and the value of the thread pointer (r13). */
469 HOWTO (R_MICROBLAZE_TLSGOTTPREL32,
470 0, /* rightshift */
471 2, /* size (0 = byte, 1 = short, 2 = long) */
472 32, /* bitsize */
473 FALSE, /* pc_relative */
474 0, /* bitpos */
475 complain_overflow_dont, /* complain_on_overflow */
476 bfd_elf_generic_reloc, /* special_function */
477 "R_MICROBLAZE_TLSGOTTPREL32", /* name */
478 FALSE, /* partial_inplace */
479 0, /* src_mask */
480 0x0000ffff, /* dst_mask */
481 FALSE), /* pcrel_offset */
482
483 /* Computes a tp-relative displacement, the difference between the value of
484 sym+add and the value of the thread pointer (r13). */
485 HOWTO (R_MICROBLAZE_TLSTPREL32,
486 0, /* rightshift */
487 2, /* size (0 = byte, 1 = short, 2 = long) */
488 32, /* bitsize */
489 FALSE, /* pc_relative */
490 0, /* bitpos */
491 complain_overflow_dont, /* complain_on_overflow */
492 bfd_elf_generic_reloc, /* special_function */
493 "R_MICROBLAZE_TLSTPREL32", /* name */
494 FALSE, /* partial_inplace */
495 0, /* src_mask */
496 0x0000ffff, /* dst_mask */
497 FALSE), /* pcrel_offset */
498
499 };
500
501 #ifndef NUM_ELEM
502 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
503 #endif
504
505 /* Initialize the microblaze_elf_howto_table, so that linear accesses can be done. */
506
507 static void
microblaze_elf_howto_init(void)508 microblaze_elf_howto_init (void)
509 {
510 unsigned int i;
511
512 for (i = NUM_ELEM (microblaze_elf_howto_raw); i--;)
513 {
514 unsigned int type;
515
516 type = microblaze_elf_howto_raw[i].type;
517
518 BFD_ASSERT (type < NUM_ELEM (microblaze_elf_howto_table));
519
520 microblaze_elf_howto_table [type] = & microblaze_elf_howto_raw [i];
521 }
522 }
523
524 static reloc_howto_type *
microblaze_elf_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)525 microblaze_elf_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
526 bfd_reloc_code_real_type code)
527 {
528 enum elf_microblaze_reloc_type microblaze_reloc = R_MICROBLAZE_NONE;
529
530 switch (code)
531 {
532 case BFD_RELOC_NONE:
533 microblaze_reloc = R_MICROBLAZE_NONE;
534 break;
535 case BFD_RELOC_MICROBLAZE_64_NONE:
536 microblaze_reloc = R_MICROBLAZE_64_NONE;
537 break;
538 case BFD_RELOC_32:
539 microblaze_reloc = R_MICROBLAZE_32;
540 break;
541 /* RVA is treated the same as 32 */
542 case BFD_RELOC_RVA:
543 microblaze_reloc = R_MICROBLAZE_32;
544 break;
545 case BFD_RELOC_32_PCREL:
546 microblaze_reloc = R_MICROBLAZE_32_PCREL;
547 break;
548 case BFD_RELOC_64_PCREL:
549 microblaze_reloc = R_MICROBLAZE_64_PCREL;
550 break;
551 case BFD_RELOC_MICROBLAZE_32_LO_PCREL:
552 microblaze_reloc = R_MICROBLAZE_32_PCREL_LO;
553 break;
554 case BFD_RELOC_64:
555 microblaze_reloc = R_MICROBLAZE_64;
556 break;
557 case BFD_RELOC_MICROBLAZE_32_LO:
558 microblaze_reloc = R_MICROBLAZE_32_LO;
559 break;
560 case BFD_RELOC_MICROBLAZE_32_ROSDA:
561 microblaze_reloc = R_MICROBLAZE_SRO32;
562 break;
563 case BFD_RELOC_MICROBLAZE_32_RWSDA:
564 microblaze_reloc = R_MICROBLAZE_SRW32;
565 break;
566 case BFD_RELOC_MICROBLAZE_32_SYM_OP_SYM:
567 microblaze_reloc = R_MICROBLAZE_32_SYM_OP_SYM;
568 break;
569 case BFD_RELOC_VTABLE_INHERIT:
570 microblaze_reloc = R_MICROBLAZE_GNU_VTINHERIT;
571 break;
572 case BFD_RELOC_VTABLE_ENTRY:
573 microblaze_reloc = R_MICROBLAZE_GNU_VTENTRY;
574 break;
575 case BFD_RELOC_MICROBLAZE_64_GOTPC:
576 microblaze_reloc = R_MICROBLAZE_GOTPC_64;
577 break;
578 case BFD_RELOC_MICROBLAZE_64_GOT:
579 microblaze_reloc = R_MICROBLAZE_GOT_64;
580 break;
581 case BFD_RELOC_MICROBLAZE_64_PLT:
582 microblaze_reloc = R_MICROBLAZE_PLT_64;
583 break;
584 case BFD_RELOC_MICROBLAZE_64_GOTOFF:
585 microblaze_reloc = R_MICROBLAZE_GOTOFF_64;
586 break;
587 case BFD_RELOC_MICROBLAZE_32_GOTOFF:
588 microblaze_reloc = R_MICROBLAZE_GOTOFF_32;
589 break;
590 case BFD_RELOC_MICROBLAZE_64_TLSGD:
591 microblaze_reloc = R_MICROBLAZE_TLSGD;
592 break;
593 case BFD_RELOC_MICROBLAZE_64_TLSLD:
594 microblaze_reloc = R_MICROBLAZE_TLSLD;
595 break;
596 case BFD_RELOC_MICROBLAZE_32_TLSDTPREL:
597 microblaze_reloc = R_MICROBLAZE_TLSDTPREL32;
598 break;
599 case BFD_RELOC_MICROBLAZE_64_TLSDTPREL:
600 microblaze_reloc = R_MICROBLAZE_TLSDTPREL64;
601 break;
602 case BFD_RELOC_MICROBLAZE_32_TLSDTPMOD:
603 microblaze_reloc = R_MICROBLAZE_TLSDTPMOD32;
604 break;
605 case BFD_RELOC_MICROBLAZE_64_TLSGOTTPREL:
606 microblaze_reloc = R_MICROBLAZE_TLSGOTTPREL32;
607 break;
608 case BFD_RELOC_MICROBLAZE_64_TLSTPREL:
609 microblaze_reloc = R_MICROBLAZE_TLSTPREL32;
610 break;
611 case BFD_RELOC_MICROBLAZE_COPY:
612 microblaze_reloc = R_MICROBLAZE_COPY;
613 break;
614 default:
615 return (reloc_howto_type *) NULL;
616 }
617
618 if (!microblaze_elf_howto_table [R_MICROBLAZE_32])
619 /* Initialize howto table if needed. */
620 microblaze_elf_howto_init ();
621
622 return microblaze_elf_howto_table [(int) microblaze_reloc];
623 };
624
625 static reloc_howto_type *
microblaze_elf_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)626 microblaze_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
627 const char *r_name)
628 {
629 unsigned int i;
630
631 for (i = 0; i < NUM_ELEM (microblaze_elf_howto_raw); i++)
632 if (microblaze_elf_howto_raw[i].name != NULL
633 && strcasecmp (microblaze_elf_howto_raw[i].name, r_name) == 0)
634 return µblaze_elf_howto_raw[i];
635
636 return NULL;
637 }
638
639 /* Set the howto pointer for a RCE ELF reloc. */
640
641 static void
microblaze_elf_info_to_howto(bfd * abfd ATTRIBUTE_UNUSED,arelent * cache_ptr,Elf_Internal_Rela * dst)642 microblaze_elf_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED,
643 arelent * cache_ptr,
644 Elf_Internal_Rela * dst)
645 {
646 unsigned int r_type;
647
648 if (!microblaze_elf_howto_table [R_MICROBLAZE_32])
649 /* Initialize howto table if needed. */
650 microblaze_elf_howto_init ();
651
652 r_type = ELF32_R_TYPE (dst->r_info);
653 if (r_type >= R_MICROBLAZE_max)
654 {
655 (*_bfd_error_handler) (_("%B: unrecognised MicroBlaze reloc number: %d"),
656 abfd, r_type);
657 bfd_set_error (bfd_error_bad_value);
658 r_type = R_MICROBLAZE_NONE;
659 }
660
661 cache_ptr->howto = microblaze_elf_howto_table [r_type];
662 }
663
664 /* Microblaze ELF local labels start with 'L.' or '$L', not '.L'. */
665
666 static bfd_boolean
microblaze_elf_is_local_label_name(bfd * abfd,const char * name)667 microblaze_elf_is_local_label_name (bfd *abfd, const char *name)
668 {
669 if (name[0] == 'L' && name[1] == '.')
670 return TRUE;
671
672 if (name[0] == '$' && name[1] == 'L')
673 return TRUE;
674
675 /* With gcc, the labels go back to starting with '.', so we accept
676 the generic ELF local label syntax as well. */
677 return _bfd_elf_is_local_label_name (abfd, name);
678 }
679
680 /* The microblaze linker (like many others) needs to keep track of
681 the number of relocs that it decides to copy as dynamic relocs in
682 check_relocs for each symbol. This is so that it can later discard
683 them if they are found to be unnecessary. We store the information
684 in a field extending the regular ELF linker hash table. */
685
686 struct elf32_mb_dyn_relocs
687 {
688 struct elf32_mb_dyn_relocs *next;
689
690 /* The input section of the reloc. */
691 asection *sec;
692
693 /* Total number of relocs copied for the input section. */
694 bfd_size_type count;
695
696 /* Number of pc-relative relocs copied for the input section. */
697 bfd_size_type pc_count;
698 };
699
700 /* ELF linker hash entry. */
701
702 struct elf32_mb_link_hash_entry
703 {
704 struct elf_link_hash_entry elf;
705
706 /* Track dynamic relocs copied for this symbol. */
707 struct elf32_mb_dyn_relocs *dyn_relocs;
708
709 /* TLS Reference Types for the symbol; Updated by check_relocs */
710 #define TLS_GD 1 /* GD reloc. */
711 #define TLS_LD 2 /* LD reloc. */
712 #define TLS_TPREL 4 /* TPREL reloc, => IE. */
713 #define TLS_DTPREL 8 /* DTPREL reloc, => LD. */
714 #define TLS_TLS 16 /* Any TLS reloc. */
715 unsigned char tls_mask;
716
717 };
718
719 #define IS_TLS_GD(x) (x == (TLS_TLS | TLS_GD))
720 #define IS_TLS_LD(x) (x == (TLS_TLS | TLS_LD))
721 #define IS_TLS_DTPREL(x) (x == (TLS_TLS | TLS_DTPREL))
722 #define IS_TLS_NONE(x) (x == 0)
723
724 #define elf32_mb_hash_entry(ent) ((struct elf32_mb_link_hash_entry *)(ent))
725
726 /* ELF linker hash table. */
727
728 struct elf32_mb_link_hash_table
729 {
730 struct elf_link_hash_table elf;
731
732 /* Short-cuts to get to dynamic linker sections. */
733 asection *sgot;
734 asection *sgotplt;
735 asection *srelgot;
736 asection *splt;
737 asection *srelplt;
738 asection *sdynbss;
739 asection *srelbss;
740
741 /* Small local sym to section mapping cache. */
742 struct sym_cache sym_sec;
743
744 /* TLS Local Dynamic GOT Entry */
745 union {
746 bfd_signed_vma refcount;
747 bfd_vma offset;
748 } tlsld_got;
749 };
750
751 /* Nonzero if this section has TLS related relocations. */
752 #define has_tls_reloc sec_flg0
753
754 /* Get the ELF linker hash table from a link_info structure. */
755
756 #define elf32_mb_hash_table(p) \
757 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
758 == MICROBLAZE_ELF_DATA ? ((struct elf32_mb_link_hash_table *) ((p)->hash)) : NULL)
759
760 /* Create an entry in a microblaze ELF linker hash table. */
761
762 static struct bfd_hash_entry *
link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)763 link_hash_newfunc (struct bfd_hash_entry *entry,
764 struct bfd_hash_table *table,
765 const char *string)
766 {
767 /* Allocate the structure if it has not already been allocated by a
768 subclass. */
769 if (entry == NULL)
770 {
771 entry = bfd_hash_allocate (table,
772 sizeof (struct elf32_mb_link_hash_entry));
773 if (entry == NULL)
774 return entry;
775 }
776
777 /* Call the allocation method of the superclass. */
778 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
779 if (entry != NULL)
780 {
781 struct elf32_mb_link_hash_entry *eh;
782
783 eh = (struct elf32_mb_link_hash_entry *) entry;
784 eh->dyn_relocs = NULL;
785 eh->tls_mask = 0;
786 }
787
788 return entry;
789 }
790
791 /* Create a mb ELF linker hash table. */
792
793 static struct bfd_link_hash_table *
microblaze_elf_link_hash_table_create(bfd * abfd)794 microblaze_elf_link_hash_table_create (bfd *abfd)
795 {
796 struct elf32_mb_link_hash_table *ret;
797 bfd_size_type amt = sizeof (struct elf32_mb_link_hash_table);
798
799 ret = (struct elf32_mb_link_hash_table *) bfd_zmalloc (amt);
800 if (ret == NULL)
801 return NULL;
802
803 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
804 sizeof (struct elf32_mb_link_hash_entry),
805 MICROBLAZE_ELF_DATA))
806 {
807 free (ret);
808 return NULL;
809 }
810
811 return &ret->elf.root;
812 }
813
814 /* Set the values of the small data pointers. */
815
816 static void
microblaze_elf_final_sdp(struct bfd_link_info * info)817 microblaze_elf_final_sdp (struct bfd_link_info *info)
818 {
819 struct bfd_link_hash_entry *h;
820
821 h = bfd_link_hash_lookup (info->hash, RO_SDA_ANCHOR_NAME, FALSE, FALSE, TRUE);
822 if (h != (struct bfd_link_hash_entry *) NULL
823 && h->type == bfd_link_hash_defined)
824 ro_small_data_pointer = (h->u.def.value
825 + h->u.def.section->output_section->vma
826 + h->u.def.section->output_offset);
827
828 h = bfd_link_hash_lookup (info->hash, RW_SDA_ANCHOR_NAME, FALSE, FALSE, TRUE);
829 if (h != (struct bfd_link_hash_entry *) NULL
830 && h->type == bfd_link_hash_defined)
831 rw_small_data_pointer = (h->u.def.value
832 + h->u.def.section->output_section->vma
833 + h->u.def.section->output_offset);
834 }
835
836 static bfd_vma
dtprel_base(struct bfd_link_info * info)837 dtprel_base (struct bfd_link_info *info)
838 {
839 /* If tls_sec is NULL, we should have signalled an error already. */
840 if (elf_hash_table (info)->tls_sec == NULL)
841 return 0;
842 return elf_hash_table (info)->tls_sec->vma;
843 }
844
845 /* The size of the thread control block. */
846 #define TCB_SIZE 8
847
848 /* Output a simple dynamic relocation into SRELOC. */
849
850 static void
microblaze_elf_output_dynamic_relocation(bfd * output_bfd,asection * sreloc,unsigned long reloc_index,unsigned long indx,int r_type,bfd_vma offset,bfd_vma addend)851 microblaze_elf_output_dynamic_relocation (bfd *output_bfd,
852 asection *sreloc,
853 unsigned long reloc_index,
854 unsigned long indx,
855 int r_type,
856 bfd_vma offset,
857 bfd_vma addend)
858 {
859
860 Elf_Internal_Rela rel;
861
862 rel.r_info = ELF32_R_INFO (indx, r_type);
863 rel.r_offset = offset;
864 rel.r_addend = addend;
865
866 bfd_elf32_swap_reloca_out (output_bfd, &rel,
867 (sreloc->contents + reloc_index * sizeof (Elf32_External_Rela)));
868 }
869
870 /* This code is taken from elf32-m32r.c
871 There is some attempt to make this function usable for many architectures,
872 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
873 if only to serve as a learning tool.
874
875 The RELOCATE_SECTION function is called by the new ELF backend linker
876 to handle the relocations for a section.
877
878 The relocs are always passed as Rela structures; if the section
879 actually uses Rel structures, the r_addend field will always be
880 zero.
881
882 This function is responsible for adjust the section contents as
883 necessary, and (if using Rela relocs and generating a
884 relocatable output file) adjusting the reloc addend as
885 necessary.
886
887 This function does not have to worry about setting the reloc
888 address or the reloc symbol index.
889
890 LOCAL_SYMS is a pointer to the swapped in local symbols.
891
892 LOCAL_SECTIONS is an array giving the section in the input file
893 corresponding to the st_shndx field of each local symbol.
894
895 The global hash table entry for the global symbols can be found
896 via elf_sym_hashes (input_bfd).
897
898 When generating relocatable output, this function must handle
899 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
900 going to be the section symbol corresponding to the output
901 section, which means that the addend must be adjusted
902 accordingly. */
903
904 static bfd_boolean
microblaze_elf_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)905 microblaze_elf_relocate_section (bfd *output_bfd,
906 struct bfd_link_info *info,
907 bfd *input_bfd,
908 asection *input_section,
909 bfd_byte *contents,
910 Elf_Internal_Rela *relocs,
911 Elf_Internal_Sym *local_syms,
912 asection **local_sections)
913 {
914 struct elf32_mb_link_hash_table *htab;
915 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
916 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
917 Elf_Internal_Rela *rel, *relend;
918 int endian = (bfd_little_endian (output_bfd)) ? 0 : 2;
919 /* Assume success. */
920 bfd_boolean ret = TRUE;
921 asection *sreloc;
922 bfd_vma *local_got_offsets;
923 unsigned int tls_type;
924
925 if (!microblaze_elf_howto_table[R_MICROBLAZE_max-1])
926 microblaze_elf_howto_init ();
927
928 htab = elf32_mb_hash_table (info);
929 if (htab == NULL)
930 return FALSE;
931
932 local_got_offsets = elf_local_got_offsets (input_bfd);
933
934 sreloc = elf_section_data (input_section)->sreloc;
935
936 rel = relocs;
937 relend = relocs + input_section->reloc_count;
938 for (; rel < relend; rel++)
939 {
940 int r_type;
941 reloc_howto_type *howto;
942 unsigned long r_symndx;
943 bfd_vma addend = rel->r_addend;
944 bfd_vma offset = rel->r_offset;
945 struct elf_link_hash_entry *h;
946 Elf_Internal_Sym *sym;
947 asection *sec;
948 const char *sym_name;
949 bfd_reloc_status_type r = bfd_reloc_ok;
950 const char *errmsg = NULL;
951 bfd_boolean unresolved_reloc = FALSE;
952
953 h = NULL;
954 r_type = ELF32_R_TYPE (rel->r_info);
955 tls_type = 0;
956
957 if (r_type < 0 || r_type >= (int) R_MICROBLAZE_max)
958 {
959 (*_bfd_error_handler) (_("%s: unknown relocation type %d"),
960 bfd_get_filename (input_bfd), (int) r_type);
961 bfd_set_error (bfd_error_bad_value);
962 ret = FALSE;
963 continue;
964 }
965
966 howto = microblaze_elf_howto_table[r_type];
967 r_symndx = ELF32_R_SYM (rel->r_info);
968
969 if (bfd_link_relocatable (info))
970 {
971 /* This is a relocatable link. We don't have to change
972 anything, unless the reloc is against a section symbol,
973 in which case we have to adjust according to where the
974 section symbol winds up in the output section. */
975 sec = NULL;
976 if (r_symndx >= symtab_hdr->sh_info)
977 /* External symbol. */
978 continue;
979
980 /* Local symbol. */
981 sym = local_syms + r_symndx;
982 sym_name = "<local symbol>";
983 /* STT_SECTION: symbol is associated with a section. */
984 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
985 /* Symbol isn't associated with a section. Nothing to do. */
986 continue;
987
988 sec = local_sections[r_symndx];
989 addend += sec->output_offset + sym->st_value;
990 #ifndef USE_REL
991 /* This can't be done for USE_REL because it doesn't mean anything
992 and elf_link_input_bfd asserts this stays zero. */
993 /* rel->r_addend = addend; */
994 #endif
995
996 #ifndef USE_REL
997 /* Addends are stored with relocs. We're done. */
998 continue;
999 #else /* USE_REL */
1000 /* If partial_inplace, we need to store any additional addend
1001 back in the section. */
1002 if (!howto->partial_inplace)
1003 continue;
1004 /* ??? Here is a nice place to call a special_function like handler. */
1005 r = _bfd_relocate_contents (howto, input_bfd, addend,
1006 contents + offset);
1007 #endif /* USE_REL */
1008 }
1009 else
1010 {
1011 bfd_vma relocation;
1012
1013 /* This is a final link. */
1014 sym = NULL;
1015 sec = NULL;
1016 unresolved_reloc = FALSE;
1017
1018 if (r_symndx < symtab_hdr->sh_info)
1019 {
1020 /* Local symbol. */
1021 sym = local_syms + r_symndx;
1022 sec = local_sections[r_symndx];
1023 if (sec == 0)
1024 continue;
1025 sym_name = "<local symbol>";
1026 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1027 /* r_addend may have changed if the reference section was
1028 a merge section. */
1029 addend = rel->r_addend;
1030 }
1031 else
1032 {
1033 /* External symbol. */
1034 bfd_boolean warned ATTRIBUTE_UNUSED;
1035 bfd_boolean ignored ATTRIBUTE_UNUSED;
1036
1037 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1038 r_symndx, symtab_hdr, sym_hashes,
1039 h, sec, relocation,
1040 unresolved_reloc, warned, ignored);
1041 sym_name = h->root.root.string;
1042 }
1043
1044 /* Sanity check the address. */
1045 if (offset > bfd_get_section_limit (input_bfd, input_section))
1046 {
1047 r = bfd_reloc_outofrange;
1048 goto check_reloc;
1049 }
1050
1051 switch ((int) r_type)
1052 {
1053 case (int) R_MICROBLAZE_SRO32 :
1054 {
1055 const char *name;
1056
1057 /* Only relocate if the symbol is defined. */
1058 if (sec)
1059 {
1060 name = bfd_get_section_name (sec->owner, sec);
1061
1062 if (strcmp (name, ".sdata2") == 0
1063 || strcmp (name, ".sbss2") == 0)
1064 {
1065 if (ro_small_data_pointer == 0)
1066 microblaze_elf_final_sdp (info);
1067 if (ro_small_data_pointer == 0)
1068 {
1069 ret = FALSE;
1070 r = bfd_reloc_undefined;
1071 goto check_reloc;
1072 }
1073
1074 /* At this point `relocation' contains the object's
1075 address. */
1076 relocation -= ro_small_data_pointer;
1077 /* Now it contains the offset from _SDA2_BASE_. */
1078 r = _bfd_final_link_relocate (howto, input_bfd,
1079 input_section,
1080 contents, offset,
1081 relocation, addend);
1082 }
1083 else
1084 {
1085 (*_bfd_error_handler) (_("%s: The target (%s) of an %s relocation is in the wrong section (%s)"),
1086 bfd_get_filename (input_bfd),
1087 sym_name,
1088 microblaze_elf_howto_table[(int) r_type]->name,
1089 bfd_get_section_name (sec->owner, sec));
1090 /*bfd_set_error (bfd_error_bad_value); ??? why? */
1091 ret = FALSE;
1092 continue;
1093 }
1094 }
1095 }
1096 break;
1097
1098 case (int) R_MICROBLAZE_SRW32 :
1099 {
1100 const char *name;
1101
1102 /* Only relocate if the symbol is defined. */
1103 if (sec)
1104 {
1105 name = bfd_get_section_name (sec->owner, sec);
1106
1107 if (strcmp (name, ".sdata") == 0
1108 || strcmp (name, ".sbss") == 0)
1109 {
1110 if (rw_small_data_pointer == 0)
1111 microblaze_elf_final_sdp (info);
1112 if (rw_small_data_pointer == 0)
1113 {
1114 ret = FALSE;
1115 r = bfd_reloc_undefined;
1116 goto check_reloc;
1117 }
1118
1119 /* At this point `relocation' contains the object's
1120 address. */
1121 relocation -= rw_small_data_pointer;
1122 /* Now it contains the offset from _SDA_BASE_. */
1123 r = _bfd_final_link_relocate (howto, input_bfd,
1124 input_section,
1125 contents, offset,
1126 relocation, addend);
1127 }
1128 else
1129 {
1130 (*_bfd_error_handler) (_("%s: The target (%s) of an %s relocation is in the wrong section (%s)"),
1131 bfd_get_filename (input_bfd),
1132 sym_name,
1133 microblaze_elf_howto_table[(int) r_type]->name,
1134 bfd_get_section_name (sec->owner, sec));
1135 /*bfd_set_error (bfd_error_bad_value); ??? why? */
1136 ret = FALSE;
1137 continue;
1138 }
1139 }
1140 }
1141 break;
1142
1143 case (int) R_MICROBLAZE_32_SYM_OP_SYM:
1144 break; /* Do nothing. */
1145
1146 case (int) R_MICROBLAZE_GOTPC_64:
1147 relocation = htab->sgotplt->output_section->vma
1148 + htab->sgotplt->output_offset;
1149 relocation -= (input_section->output_section->vma
1150 + input_section->output_offset
1151 + offset + INST_WORD_SIZE);
1152 relocation += addend;
1153 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1154 contents + offset + endian);
1155 bfd_put_16 (input_bfd, relocation & 0xffff,
1156 contents + offset + endian + INST_WORD_SIZE);
1157 break;
1158
1159 case (int) R_MICROBLAZE_PLT_64:
1160 {
1161 bfd_vma immediate;
1162 if (htab->splt != NULL && h != NULL
1163 && h->plt.offset != (bfd_vma) -1)
1164 {
1165 relocation = (htab->splt->output_section->vma
1166 + htab->splt->output_offset
1167 + h->plt.offset);
1168 unresolved_reloc = FALSE;
1169 immediate = relocation - (input_section->output_section->vma
1170 + input_section->output_offset
1171 + offset + INST_WORD_SIZE);
1172 bfd_put_16 (input_bfd, (immediate >> 16) & 0xffff,
1173 contents + offset + endian);
1174 bfd_put_16 (input_bfd, immediate & 0xffff,
1175 contents + offset + endian + INST_WORD_SIZE);
1176 }
1177 else
1178 {
1179 relocation -= (input_section->output_section->vma
1180 + input_section->output_offset
1181 + offset + INST_WORD_SIZE);
1182 immediate = relocation;
1183 bfd_put_16 (input_bfd, (immediate >> 16) & 0xffff,
1184 contents + offset + endian);
1185 bfd_put_16 (input_bfd, immediate & 0xffff,
1186 contents + offset + endian + INST_WORD_SIZE);
1187 }
1188 break;
1189 }
1190
1191 case (int) R_MICROBLAZE_TLSGD:
1192 tls_type = (TLS_TLS | TLS_GD);
1193 goto dogot;
1194 case (int) R_MICROBLAZE_TLSLD:
1195 tls_type = (TLS_TLS | TLS_LD);
1196 dogot:
1197 case (int) R_MICROBLAZE_GOT_64:
1198 {
1199 bfd_vma *offp;
1200 bfd_vma off, off2;
1201 unsigned long indx;
1202 bfd_vma static_value;
1203
1204 bfd_boolean need_relocs = FALSE;
1205 if (htab->sgot == NULL)
1206 abort ();
1207
1208 indx = 0;
1209 offp = NULL;
1210
1211 /* 1. Identify GOT Offset;
1212 2. Compute Static Values
1213 3. Process Module Id, Process Offset
1214 4. Fixup Relocation with GOT offset value. */
1215
1216 /* 1. Determine GOT Offset to use : TLS_LD, global, local */
1217 if (IS_TLS_LD (tls_type))
1218 offp = &htab->tlsld_got.offset;
1219 else if (h != NULL)
1220 {
1221 if (htab->sgotplt != NULL && h->got.offset != (bfd_vma) -1)
1222 offp = &h->got.offset;
1223 else
1224 abort ();
1225 }
1226 else
1227 {
1228 if (local_got_offsets == NULL)
1229 abort ();
1230 offp = &local_got_offsets[r_symndx];
1231 }
1232
1233 if (!offp)
1234 abort ();
1235
1236 off = (*offp) & ~1;
1237 off2 = off;
1238
1239 if (IS_TLS_LD(tls_type) || IS_TLS_GD(tls_type))
1240 off2 = off + 4;
1241
1242 /* Symbol index to use for relocs */
1243 if (h != NULL)
1244 {
1245 bfd_boolean dyn =
1246 elf_hash_table (info)->dynamic_sections_created;
1247
1248 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
1249 bfd_link_pic (info),
1250 h)
1251 && (!bfd_link_pic (info)
1252 || !SYMBOL_REFERENCES_LOCAL (info, h)))
1253 indx = h->dynindx;
1254 }
1255
1256 /* Need to generate relocs ? */
1257 if ((bfd_link_pic (info) || indx != 0)
1258 && (h == NULL
1259 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1260 || h->root.type != bfd_link_hash_undefweak))
1261 need_relocs = TRUE;
1262
1263 /* 2. Compute/Emit Static value of r-expression */
1264 static_value = relocation + addend;
1265
1266 /* 3. Process module-id and offset */
1267 if (! ((*offp) & 1) )
1268 {
1269 bfd_vma got_offset;
1270
1271 got_offset = (htab->sgot->output_section->vma
1272 + htab->sgot->output_offset
1273 + off);
1274
1275 /* Process module-id */
1276 if (IS_TLS_LD(tls_type))
1277 {
1278 if (! bfd_link_pic (info))
1279 {
1280 bfd_put_32 (output_bfd, 1, htab->sgot->contents + off);
1281 }
1282 else
1283 {
1284 microblaze_elf_output_dynamic_relocation (output_bfd,
1285 htab->srelgot, htab->srelgot->reloc_count++,
1286 /* symindex= */ 0, R_MICROBLAZE_TLSDTPMOD32,
1287 got_offset, 0);
1288 }
1289 }
1290 else if (IS_TLS_GD(tls_type))
1291 {
1292 if (! need_relocs)
1293 {
1294 bfd_put_32 (output_bfd, 1, htab->sgot->contents + off);
1295 }
1296 else
1297 {
1298 microblaze_elf_output_dynamic_relocation (output_bfd,
1299 htab->srelgot,
1300 htab->srelgot->reloc_count++,
1301 /* symindex= */ indx, R_MICROBLAZE_TLSDTPMOD32,
1302 got_offset, indx ? 0 : static_value);
1303 }
1304 }
1305
1306 /* Process Offset */
1307 if (htab->srelgot == NULL)
1308 abort ();
1309
1310 got_offset = (htab->sgot->output_section->vma
1311 + htab->sgot->output_offset
1312 + off2);
1313 if (IS_TLS_LD(tls_type))
1314 {
1315 /* For LD, offset should be 0 */
1316 *offp |= 1;
1317 bfd_put_32 (output_bfd, 0, htab->sgot->contents + off2);
1318 }
1319 else if (IS_TLS_GD(tls_type))
1320 {
1321 *offp |= 1;
1322 static_value -= dtprel_base(info);
1323 if (need_relocs)
1324 {
1325 microblaze_elf_output_dynamic_relocation (output_bfd,
1326 htab->srelgot, htab->srelgot->reloc_count++,
1327 /* symindex= */ indx, R_MICROBLAZE_TLSDTPREL32,
1328 got_offset, indx ? 0 : static_value);
1329 }
1330 else
1331 {
1332 bfd_put_32 (output_bfd, static_value,
1333 htab->sgot->contents + off2);
1334 }
1335 }
1336 else
1337 {
1338 bfd_put_32 (output_bfd, static_value,
1339 htab->sgot->contents + off2);
1340
1341 /* Relocs for dyn symbols generated by
1342 finish_dynamic_symbols */
1343 if (bfd_link_pic (info) && h == NULL)
1344 {
1345 *offp |= 1;
1346 microblaze_elf_output_dynamic_relocation (output_bfd,
1347 htab->srelgot, htab->srelgot->reloc_count++,
1348 /* symindex= */ indx, R_MICROBLAZE_REL,
1349 got_offset, static_value);
1350 }
1351 }
1352 }
1353
1354 /* 4. Fixup Relocation with GOT offset value
1355 Compute relative address of GOT entry for applying
1356 the current relocation */
1357 relocation = htab->sgot->output_section->vma
1358 + htab->sgot->output_offset
1359 + off
1360 - htab->sgotplt->output_section->vma
1361 - htab->sgotplt->output_offset;
1362
1363 /* Apply Current Relocation */
1364 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1365 contents + offset + endian);
1366 bfd_put_16 (input_bfd, relocation & 0xffff,
1367 contents + offset + endian + INST_WORD_SIZE);
1368
1369 unresolved_reloc = FALSE;
1370 break;
1371 }
1372
1373 case (int) R_MICROBLAZE_GOTOFF_64:
1374 {
1375 bfd_vma immediate;
1376 unsigned short lo, high;
1377 relocation += addend;
1378 relocation -= htab->sgotplt->output_section->vma
1379 + htab->sgotplt->output_offset;
1380 /* Write this value into correct location. */
1381 immediate = relocation;
1382 lo = immediate & 0x0000ffff;
1383 high = (immediate >> 16) & 0x0000ffff;
1384 bfd_put_16 (input_bfd, high, contents + offset + endian);
1385 bfd_put_16 (input_bfd, lo, contents + offset + INST_WORD_SIZE + endian);
1386 break;
1387 }
1388
1389 case (int) R_MICROBLAZE_GOTOFF_32:
1390 {
1391 relocation += addend;
1392 relocation -= htab->sgotplt->output_section->vma
1393 + htab->sgotplt->output_offset;
1394 /* Write this value into correct location. */
1395 bfd_put_32 (input_bfd, relocation, contents + offset);
1396 break;
1397 }
1398
1399 case (int) R_MICROBLAZE_TLSDTPREL64:
1400 relocation += addend;
1401 relocation -= dtprel_base(info);
1402 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1403 contents + offset + 2);
1404 bfd_put_16 (input_bfd, relocation & 0xffff,
1405 contents + offset + 2 + INST_WORD_SIZE);
1406 break;
1407 case (int) R_MICROBLAZE_64_PCREL :
1408 case (int) R_MICROBLAZE_64:
1409 case (int) R_MICROBLAZE_32:
1410 {
1411 /* r_symndx will be STN_UNDEF (zero) only for relocs against symbols
1412 from removed linkonce sections, or sections discarded by
1413 a linker script. */
1414 if (r_symndx == STN_UNDEF || (input_section->flags & SEC_ALLOC) == 0)
1415 {
1416 relocation += addend;
1417 if (r_type == R_MICROBLAZE_32)
1418 bfd_put_32 (input_bfd, relocation, contents + offset);
1419 else
1420 {
1421 if (r_type == R_MICROBLAZE_64_PCREL)
1422 relocation -= (input_section->output_section->vma
1423 + input_section->output_offset
1424 + offset + INST_WORD_SIZE);
1425 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1426 contents + offset + endian);
1427 bfd_put_16 (input_bfd, relocation & 0xffff,
1428 contents + offset + endian + INST_WORD_SIZE);
1429 }
1430 break;
1431 }
1432
1433 if ((bfd_link_pic (info)
1434 && (h == NULL
1435 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1436 || h->root.type != bfd_link_hash_undefweak)
1437 && (!howto->pc_relative
1438 || (h != NULL
1439 && h->dynindx != -1
1440 && (!info->symbolic
1441 || !h->def_regular))))
1442 || (!bfd_link_pic (info)
1443 && h != NULL
1444 && h->dynindx != -1
1445 && !h->non_got_ref
1446 && ((h->def_dynamic
1447 && !h->def_regular)
1448 || h->root.type == bfd_link_hash_undefweak
1449 || h->root.type == bfd_link_hash_undefined)))
1450 {
1451 Elf_Internal_Rela outrel;
1452 bfd_byte *loc;
1453 bfd_boolean skip;
1454
1455 /* When generating a shared object, these relocations
1456 are copied into the output file to be resolved at run
1457 time. */
1458
1459 BFD_ASSERT (sreloc != NULL);
1460
1461 skip = FALSE;
1462
1463 outrel.r_offset =
1464 _bfd_elf_section_offset (output_bfd, info, input_section,
1465 rel->r_offset);
1466 if (outrel.r_offset == (bfd_vma) -1)
1467 skip = TRUE;
1468 else if (outrel.r_offset == (bfd_vma) -2)
1469 skip = TRUE;
1470 outrel.r_offset += (input_section->output_section->vma
1471 + input_section->output_offset);
1472
1473 if (skip)
1474 memset (&outrel, 0, sizeof outrel);
1475 /* h->dynindx may be -1 if the symbol was marked to
1476 become local. */
1477 else if (h != NULL
1478 && ((! info->symbolic && h->dynindx != -1)
1479 || !h->def_regular))
1480 {
1481 BFD_ASSERT (h->dynindx != -1);
1482 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1483 outrel.r_addend = addend;
1484 }
1485 else
1486 {
1487 if (r_type == R_MICROBLAZE_32)
1488 {
1489 outrel.r_info = ELF32_R_INFO (0, R_MICROBLAZE_REL);
1490 outrel.r_addend = relocation + addend;
1491 }
1492 else
1493 {
1494 BFD_FAIL ();
1495 (*_bfd_error_handler)
1496 (_("%B: probably compiled without -fPIC?"),
1497 input_bfd);
1498 bfd_set_error (bfd_error_bad_value);
1499 return FALSE;
1500 }
1501 }
1502
1503 loc = sreloc->contents;
1504 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1505 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1506 break;
1507 }
1508 else
1509 {
1510 relocation += addend;
1511 if (r_type == R_MICROBLAZE_32)
1512 bfd_put_32 (input_bfd, relocation, contents + offset);
1513 else
1514 {
1515 if (r_type == R_MICROBLAZE_64_PCREL)
1516 relocation -= (input_section->output_section->vma
1517 + input_section->output_offset
1518 + offset + INST_WORD_SIZE);
1519 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1520 contents + offset + endian);
1521 bfd_put_16 (input_bfd, relocation & 0xffff,
1522 contents + offset + endian + INST_WORD_SIZE);
1523 }
1524 break;
1525 }
1526 }
1527
1528 default :
1529 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1530 contents, offset,
1531 relocation, addend);
1532 break;
1533 }
1534 }
1535
1536 check_reloc:
1537
1538 if (r != bfd_reloc_ok)
1539 {
1540 /* FIXME: This should be generic enough to go in a utility. */
1541 const char *name;
1542
1543 if (h != NULL)
1544 name = h->root.root.string;
1545 else
1546 {
1547 name = (bfd_elf_string_from_elf_section
1548 (input_bfd, symtab_hdr->sh_link, sym->st_name));
1549 if (name == NULL || *name == '\0')
1550 name = bfd_section_name (input_bfd, sec);
1551 }
1552
1553 if (errmsg != NULL)
1554 goto common_error;
1555
1556 switch (r)
1557 {
1558 case bfd_reloc_overflow:
1559 (*info->callbacks->reloc_overflow)
1560 (info, (h ? &h->root : NULL), name, howto->name,
1561 (bfd_vma) 0, input_bfd, input_section, offset);
1562 break;
1563
1564 case bfd_reloc_undefined:
1565 (*info->callbacks->undefined_symbol)
1566 (info, name, input_bfd, input_section, offset, TRUE);
1567 break;
1568
1569 case bfd_reloc_outofrange:
1570 errmsg = _("internal error: out of range error");
1571 goto common_error;
1572
1573 case bfd_reloc_notsupported:
1574 errmsg = _("internal error: unsupported relocation error");
1575 goto common_error;
1576
1577 case bfd_reloc_dangerous:
1578 errmsg = _("internal error: dangerous error");
1579 goto common_error;
1580
1581 default:
1582 errmsg = _("internal error: unknown error");
1583 /* Fall through. */
1584 common_error:
1585 (*info->callbacks->warning) (info, errmsg, name, input_bfd,
1586 input_section, offset);
1587 break;
1588 }
1589 }
1590 }
1591
1592 return ret;
1593 }
1594
1595 /* Merge backend specific data from an object file to the output
1596 object file when linking.
1597
1598 Note: We only use this hook to catch endian mismatches. */
1599 static bfd_boolean
microblaze_elf_merge_private_bfd_data(bfd * ibfd,bfd * obfd)1600 microblaze_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
1601 {
1602 /* Check if we have the same endianess. */
1603 if (! _bfd_generic_verify_endian_match (ibfd, obfd))
1604 return FALSE;
1605
1606 return TRUE;
1607 }
1608
1609
1610 /* Calculate fixup value for reference. */
1611
1612 static int
calc_fixup(bfd_vma start,bfd_vma size,asection * sec)1613 calc_fixup (bfd_vma start, bfd_vma size, asection *sec)
1614 {
1615 bfd_vma end = start + size;
1616 int i, fixup = 0;
1617
1618 if (sec == NULL || sec->relax == NULL)
1619 return 0;
1620
1621 /* Look for addr in relax table, total fixup value. */
1622 for (i = 0; i < sec->relax_count; i++)
1623 {
1624 if (end <= sec->relax[i].addr)
1625 break;
1626 if ((end != start) && (start > sec->relax[i].addr))
1627 continue;
1628 fixup += sec->relax[i].size;
1629 }
1630 return fixup;
1631 }
1632
1633 /* Read-modify-write into the bfd, an immediate value into appropriate fields of
1634 a 32-bit instruction. */
1635 static void
microblaze_bfd_write_imm_value_32(bfd * abfd,bfd_byte * bfd_addr,bfd_vma val)1636 microblaze_bfd_write_imm_value_32 (bfd *abfd, bfd_byte *bfd_addr, bfd_vma val)
1637 {
1638 unsigned long instr = bfd_get_32 (abfd, bfd_addr);
1639 instr &= ~0x0000ffff;
1640 instr |= (val & 0x0000ffff);
1641 bfd_put_32 (abfd, instr, bfd_addr);
1642 }
1643
1644 /* Read-modify-write into the bfd, an immediate value into appropriate fields of
1645 two consecutive 32-bit instructions. */
1646 static void
microblaze_bfd_write_imm_value_64(bfd * abfd,bfd_byte * bfd_addr,bfd_vma val)1647 microblaze_bfd_write_imm_value_64 (bfd *abfd, bfd_byte *bfd_addr, bfd_vma val)
1648 {
1649 unsigned long instr_hi;
1650 unsigned long instr_lo;
1651
1652 instr_hi = bfd_get_32 (abfd, bfd_addr);
1653 instr_hi &= ~0x0000ffff;
1654 instr_hi |= ((val >> 16) & 0x0000ffff);
1655 bfd_put_32 (abfd, instr_hi, bfd_addr);
1656
1657 instr_lo = bfd_get_32 (abfd, bfd_addr + INST_WORD_SIZE);
1658 instr_lo &= ~0x0000ffff;
1659 instr_lo |= (val & 0x0000ffff);
1660 bfd_put_32 (abfd, instr_lo, bfd_addr + INST_WORD_SIZE);
1661 }
1662
1663 static bfd_boolean
microblaze_elf_relax_section(bfd * abfd,asection * sec,struct bfd_link_info * link_info,bfd_boolean * again)1664 microblaze_elf_relax_section (bfd *abfd,
1665 asection *sec,
1666 struct bfd_link_info *link_info,
1667 bfd_boolean *again)
1668 {
1669 Elf_Internal_Shdr *symtab_hdr;
1670 Elf_Internal_Rela *internal_relocs;
1671 Elf_Internal_Rela *free_relocs = NULL;
1672 Elf_Internal_Rela *irel, *irelend;
1673 bfd_byte *contents = NULL;
1674 bfd_byte *free_contents = NULL;
1675 int rel_count;
1676 unsigned int shndx;
1677 int i, sym_index;
1678 asection *o;
1679 struct elf_link_hash_entry *sym_hash;
1680 Elf_Internal_Sym *isymbuf, *isymend;
1681 Elf_Internal_Sym *isym;
1682 int symcount;
1683 int offset;
1684 bfd_vma src, dest;
1685
1686 /* We only do this once per section. We may be able to delete some code
1687 by running multiple passes, but it is not worth it. */
1688 *again = FALSE;
1689
1690 /* Only do this for a text section. */
1691 if (bfd_link_relocatable (link_info)
1692 || (sec->flags & SEC_RELOC) == 0
1693 || (sec->reloc_count == 0)
1694 || (sec->flags & SEC_CODE) == 0)
1695 return TRUE;
1696
1697 BFD_ASSERT ((sec->size > 0) || (sec->rawsize > 0));
1698
1699 /* If this is the first time we have been called for this section,
1700 initialize the cooked size. */
1701 if (sec->size == 0)
1702 sec->size = sec->rawsize;
1703
1704 /* Get symbols for this section. */
1705 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1706 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1707 symcount = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
1708 if (isymbuf == NULL)
1709 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, symcount,
1710 0, NULL, NULL, NULL);
1711 BFD_ASSERT (isymbuf != NULL);
1712
1713 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory);
1714 if (internal_relocs == NULL)
1715 goto error_return;
1716 if (! link_info->keep_memory)
1717 free_relocs = internal_relocs;
1718
1719 sec->relax = (struct relax_table *) bfd_malloc ((sec->reloc_count + 1)
1720 * sizeof (struct relax_table));
1721 if (sec->relax == NULL)
1722 goto error_return;
1723 sec->relax_count = 0;
1724
1725 irelend = internal_relocs + sec->reloc_count;
1726 rel_count = 0;
1727 for (irel = internal_relocs; irel < irelend; irel++, rel_count++)
1728 {
1729 bfd_vma symval;
1730 if ((ELF32_R_TYPE (irel->r_info) != (int) R_MICROBLAZE_64_PCREL)
1731 && (ELF32_R_TYPE (irel->r_info) != (int) R_MICROBLAZE_64 ))
1732 continue; /* Can't delete this reloc. */
1733
1734 /* Get the section contents. */
1735 if (contents == NULL)
1736 {
1737 if (elf_section_data (sec)->this_hdr.contents != NULL)
1738 contents = elf_section_data (sec)->this_hdr.contents;
1739 else
1740 {
1741 contents = (bfd_byte *) bfd_malloc (sec->size);
1742 if (contents == NULL)
1743 goto error_return;
1744 free_contents = contents;
1745
1746 if (!bfd_get_section_contents (abfd, sec, contents,
1747 (file_ptr) 0, sec->size))
1748 goto error_return;
1749 elf_section_data (sec)->this_hdr.contents = contents;
1750 }
1751 }
1752
1753 /* Get the value of the symbol referred to by the reloc. */
1754 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
1755 {
1756 /* A local symbol. */
1757 asection *sym_sec;
1758
1759 isym = isymbuf + ELF32_R_SYM (irel->r_info);
1760 if (isym->st_shndx == SHN_UNDEF)
1761 sym_sec = bfd_und_section_ptr;
1762 else if (isym->st_shndx == SHN_ABS)
1763 sym_sec = bfd_abs_section_ptr;
1764 else if (isym->st_shndx == SHN_COMMON)
1765 sym_sec = bfd_com_section_ptr;
1766 else
1767 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1768
1769 symval = _bfd_elf_rela_local_sym (abfd, isym, &sym_sec, irel);
1770 }
1771 else
1772 {
1773 unsigned long indx;
1774 struct elf_link_hash_entry *h;
1775
1776 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
1777 h = elf_sym_hashes (abfd)[indx];
1778 BFD_ASSERT (h != NULL);
1779
1780 if (h->root.type != bfd_link_hash_defined
1781 && h->root.type != bfd_link_hash_defweak)
1782 /* This appears to be a reference to an undefined
1783 symbol. Just ignore it--it will be caught by the
1784 regular reloc processing. */
1785 continue;
1786
1787 symval = (h->root.u.def.value
1788 + h->root.u.def.section->output_section->vma
1789 + h->root.u.def.section->output_offset);
1790 }
1791
1792 /* If this is a PC-relative reloc, subtract the instr offset from
1793 the symbol value. */
1794 if (ELF32_R_TYPE (irel->r_info) == (int) R_MICROBLAZE_64_PCREL)
1795 {
1796 symval = symval + irel->r_addend
1797 - (irel->r_offset
1798 + sec->output_section->vma
1799 + sec->output_offset);
1800 }
1801 else
1802 symval += irel->r_addend;
1803
1804 if ((symval & 0xffff8000) == 0
1805 || (symval & 0xffff8000) == 0xffff8000)
1806 {
1807 /* We can delete this instruction. */
1808 sec->relax[sec->relax_count].addr = irel->r_offset;
1809 sec->relax[sec->relax_count].size = INST_WORD_SIZE;
1810 sec->relax_count++;
1811
1812 /* Rewrite relocation type. */
1813 switch ((enum elf_microblaze_reloc_type) ELF32_R_TYPE (irel->r_info))
1814 {
1815 case R_MICROBLAZE_64_PCREL:
1816 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1817 (int) R_MICROBLAZE_32_PCREL_LO);
1818 break;
1819 case R_MICROBLAZE_64:
1820 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1821 (int) R_MICROBLAZE_32_LO);
1822 break;
1823 default:
1824 /* Cannot happen. */
1825 BFD_ASSERT (FALSE);
1826 }
1827 }
1828 } /* Loop through all relocations. */
1829
1830 /* Loop through the relocs again, and see if anything needs to change. */
1831 if (sec->relax_count > 0)
1832 {
1833 shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1834 rel_count = 0;
1835 sec->relax[sec->relax_count].addr = sec->size;
1836
1837 for (irel = internal_relocs; irel < irelend; irel++, rel_count++)
1838 {
1839 bfd_vma nraddr;
1840
1841 /* Get the new reloc address. */
1842 nraddr = irel->r_offset - calc_fixup (irel->r_offset, 0, sec);
1843 switch ((enum elf_microblaze_reloc_type) ELF32_R_TYPE (irel->r_info))
1844 {
1845 default:
1846 break;
1847 case R_MICROBLAZE_64_PCREL:
1848 break;
1849 case R_MICROBLAZE_64:
1850 case R_MICROBLAZE_32_LO:
1851 /* If this reloc is against a symbol defined in this
1852 section, we must check the addend to see it will put the value in
1853 range to be adjusted, and hence must be changed. */
1854 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
1855 {
1856 isym = isymbuf + ELF32_R_SYM (irel->r_info);
1857 /* Only handle relocs against .text. */
1858 if (isym->st_shndx == shndx
1859 && ELF32_ST_TYPE (isym->st_info) == STT_SECTION)
1860 irel->r_addend -= calc_fixup (irel->r_addend, 0, sec);
1861 }
1862 break;
1863 case R_MICROBLAZE_NONE:
1864 {
1865 /* This was a PC-relative instruction that was
1866 completely resolved. */
1867 int sfix, efix;
1868 bfd_vma target_address;
1869 target_address = irel->r_addend + irel->r_offset;
1870 sfix = calc_fixup (irel->r_offset, 0, sec);
1871 efix = calc_fixup (target_address, 0, sec);
1872 irel->r_addend -= (efix - sfix);
1873 /* Should use HOWTO. */
1874 microblaze_bfd_write_imm_value_32 (abfd, contents + irel->r_offset,
1875 irel->r_addend);
1876 }
1877 break;
1878 case R_MICROBLAZE_64_NONE:
1879 {
1880 /* This was a PC-relative 64-bit instruction that was
1881 completely resolved. */
1882 int sfix, efix;
1883 bfd_vma target_address;
1884 target_address = irel->r_addend + irel->r_offset + INST_WORD_SIZE;
1885 sfix = calc_fixup (irel->r_offset + INST_WORD_SIZE, 0, sec);
1886 efix = calc_fixup (target_address, 0, sec);
1887 irel->r_addend -= (efix - sfix);
1888 microblaze_bfd_write_imm_value_32 (abfd, contents + irel->r_offset
1889 + INST_WORD_SIZE, irel->r_addend);
1890 }
1891 break;
1892 }
1893 irel->r_offset = nraddr;
1894 } /* Change all relocs in this section. */
1895
1896 /* Look through all other sections. */
1897 for (o = abfd->sections; o != NULL; o = o->next)
1898 {
1899 Elf_Internal_Rela *irelocs;
1900 Elf_Internal_Rela *irelscan, *irelscanend;
1901 bfd_byte *ocontents;
1902
1903 if (o == sec
1904 || (o->flags & SEC_RELOC) == 0
1905 || o->reloc_count == 0)
1906 continue;
1907
1908 /* We always cache the relocs. Perhaps, if info->keep_memory is
1909 FALSE, we should free them, if we are permitted to. */
1910
1911 irelocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL, TRUE);
1912 if (irelocs == NULL)
1913 goto error_return;
1914
1915 ocontents = NULL;
1916 irelscanend = irelocs + o->reloc_count;
1917 for (irelscan = irelocs; irelscan < irelscanend; irelscan++)
1918 {
1919 if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32)
1920 {
1921 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1922
1923 /* Look at the reloc only if the value has been resolved. */
1924 if (isym->st_shndx == shndx
1925 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
1926 {
1927 if (ocontents == NULL)
1928 {
1929 if (elf_section_data (o)->this_hdr.contents != NULL)
1930 ocontents = elf_section_data (o)->this_hdr.contents;
1931 else
1932 {
1933 /* We always cache the section contents.
1934 Perhaps, if info->keep_memory is FALSE, we
1935 should free them, if we are permitted to. */
1936 if (o->rawsize == 0)
1937 o->rawsize = o->size;
1938 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1939 if (ocontents == NULL)
1940 goto error_return;
1941 if (!bfd_get_section_contents (abfd, o, ocontents,
1942 (file_ptr) 0,
1943 o->rawsize))
1944 goto error_return;
1945 elf_section_data (o)->this_hdr.contents = ocontents;
1946 }
1947
1948 }
1949 irelscan->r_addend -= calc_fixup (irelscan->r_addend, 0, sec);
1950 }
1951 else if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_SYM_OP_SYM)
1952 {
1953 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1954
1955 /* Look at the reloc only if the value has been resolved. */
1956 if (ocontents == NULL)
1957 {
1958 if (elf_section_data (o)->this_hdr.contents != NULL)
1959 ocontents = elf_section_data (o)->this_hdr.contents;
1960 else
1961 {
1962 /* We always cache the section contents.
1963 Perhaps, if info->keep_memory is FALSE, we
1964 should free them, if we are permitted to. */
1965
1966 if (o->rawsize == 0)
1967 o->rawsize = o->size;
1968 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1969 if (ocontents == NULL)
1970 goto error_return;
1971 if (!bfd_get_section_contents (abfd, o, ocontents,
1972 (file_ptr) 0,
1973 o->rawsize))
1974 goto error_return;
1975 elf_section_data (o)->this_hdr.contents = ocontents;
1976 }
1977 }
1978 irelscan->r_addend -= calc_fixup (irel->r_addend
1979 + isym->st_value,
1980 0,
1981 sec);
1982 }
1983 }
1984 else if ((ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_PCREL_LO)
1985 || (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_LO))
1986 {
1987 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1988
1989 /* Look at the reloc only if the value has been resolved. */
1990 if (isym->st_shndx == shndx
1991 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
1992 {
1993 bfd_vma immediate;
1994 bfd_vma target_address;
1995
1996 if (ocontents == NULL)
1997 {
1998 if (elf_section_data (o)->this_hdr.contents != NULL)
1999 ocontents = elf_section_data (o)->this_hdr.contents;
2000 else
2001 {
2002 /* We always cache the section contents.
2003 Perhaps, if info->keep_memory is FALSE, we
2004 should free them, if we are permitted to. */
2005 if (o->rawsize == 0)
2006 o->rawsize = o->size;
2007 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
2008 if (ocontents == NULL)
2009 goto error_return;
2010 if (!bfd_get_section_contents (abfd, o, ocontents,
2011 (file_ptr) 0,
2012 o->rawsize))
2013 goto error_return;
2014 elf_section_data (o)->this_hdr.contents = ocontents;
2015 }
2016 }
2017
2018 unsigned long instr = bfd_get_32 (abfd, ocontents + irelscan->r_offset);
2019 immediate = instr & 0x0000ffff;
2020 target_address = immediate;
2021 offset = calc_fixup (target_address, 0, sec);
2022 immediate -= offset;
2023 irelscan->r_addend -= offset;
2024 microblaze_bfd_write_imm_value_32 (abfd, ocontents + irelscan->r_offset,
2025 irelscan->r_addend);
2026 }
2027 }
2028
2029 if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_64)
2030 {
2031 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
2032
2033 /* Look at the reloc only if the value has been resolved. */
2034 if (isym->st_shndx == shndx
2035 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
2036 {
2037 bfd_vma immediate;
2038
2039 if (ocontents == NULL)
2040 {
2041 if (elf_section_data (o)->this_hdr.contents != NULL)
2042 ocontents = elf_section_data (o)->this_hdr.contents;
2043 else
2044 {
2045 /* We always cache the section contents.
2046 Perhaps, if info->keep_memory is FALSE, we
2047 should free them, if we are permitted to. */
2048
2049 if (o->rawsize == 0)
2050 o->rawsize = o->size;
2051 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
2052 if (ocontents == NULL)
2053 goto error_return;
2054 if (!bfd_get_section_contents (abfd, o, ocontents,
2055 (file_ptr) 0,
2056 o->rawsize))
2057 goto error_return;
2058 elf_section_data (o)->this_hdr.contents = ocontents;
2059 }
2060 }
2061 unsigned long instr_hi = bfd_get_32 (abfd, ocontents
2062 + irelscan->r_offset);
2063 unsigned long instr_lo = bfd_get_32 (abfd, ocontents
2064 + irelscan->r_offset
2065 + INST_WORD_SIZE);
2066 immediate = (instr_hi & 0x0000ffff) << 16;
2067 immediate |= (instr_lo & 0x0000ffff);
2068 offset = calc_fixup (irelscan->r_addend, 0, sec);
2069 immediate -= offset;
2070 irelscan->r_addend -= offset;
2071 }
2072 }
2073 else if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_64_PCREL)
2074 {
2075 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
2076
2077 /* Look at the reloc only if the value has been resolved. */
2078 if (isym->st_shndx == shndx
2079 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
2080 {
2081 bfd_vma immediate;
2082 bfd_vma target_address;
2083
2084 if (ocontents == NULL)
2085 {
2086 if (elf_section_data (o)->this_hdr.contents != NULL)
2087 ocontents = elf_section_data (o)->this_hdr.contents;
2088 else
2089 {
2090 /* We always cache the section contents.
2091 Perhaps, if info->keep_memory is FALSE, we
2092 should free them, if we are permitted to. */
2093 if (o->rawsize == 0)
2094 o->rawsize = o->size;
2095 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
2096 if (ocontents == NULL)
2097 goto error_return;
2098 if (!bfd_get_section_contents (abfd, o, ocontents,
2099 (file_ptr) 0,
2100 o->rawsize))
2101 goto error_return;
2102 elf_section_data (o)->this_hdr.contents = ocontents;
2103 }
2104 }
2105 unsigned long instr_hi = bfd_get_32 (abfd, ocontents
2106 + irelscan->r_offset);
2107 unsigned long instr_lo = bfd_get_32 (abfd, ocontents
2108 + irelscan->r_offset
2109 + INST_WORD_SIZE);
2110 immediate = (instr_hi & 0x0000ffff) << 16;
2111 immediate |= (instr_lo & 0x0000ffff);
2112 target_address = immediate;
2113 offset = calc_fixup (target_address, 0, sec);
2114 immediate -= offset;
2115 irelscan->r_addend -= offset;
2116 microblaze_bfd_write_imm_value_64 (abfd, ocontents
2117 + irelscan->r_offset, immediate);
2118 }
2119 }
2120 }
2121 }
2122
2123 /* Adjust the local symbols defined in this section. */
2124 isymend = isymbuf + symtab_hdr->sh_info;
2125 for (isym = isymbuf; isym < isymend; isym++)
2126 {
2127 if (isym->st_shndx == shndx)
2128 {
2129 isym->st_value -= calc_fixup (isym->st_value, 0, sec);
2130 if (isym->st_size)
2131 isym->st_size -= calc_fixup (isym->st_value, isym->st_size, sec);
2132 }
2133 }
2134
2135 /* Now adjust the global symbols defined in this section. */
2136 isym = isymbuf + symtab_hdr->sh_info;
2137 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)) - symtab_hdr->sh_info;
2138 for (sym_index = 0; sym_index < symcount; sym_index++)
2139 {
2140 sym_hash = elf_sym_hashes (abfd)[sym_index];
2141 if ((sym_hash->root.type == bfd_link_hash_defined
2142 || sym_hash->root.type == bfd_link_hash_defweak)
2143 && sym_hash->root.u.def.section == sec)
2144 {
2145 sym_hash->root.u.def.value -= calc_fixup (sym_hash->root.u.def.value,
2146 0, sec);
2147 if (sym_hash->size)
2148 sym_hash->size -= calc_fixup (sym_hash->root.u.def.value,
2149 sym_hash->size, sec);
2150 }
2151 }
2152
2153 /* Physically move the code and change the cooked size. */
2154 dest = sec->relax[0].addr;
2155 for (i = 0; i < sec->relax_count; i++)
2156 {
2157 int len;
2158 src = sec->relax[i].addr + sec->relax[i].size;
2159 len = sec->relax[i+1].addr - sec->relax[i].addr - sec->relax[i].size;
2160
2161 memmove (contents + dest, contents + src, len);
2162 sec->size -= sec->relax[i].size;
2163 dest += len;
2164 }
2165
2166 elf_section_data (sec)->relocs = internal_relocs;
2167 free_relocs = NULL;
2168
2169 elf_section_data (sec)->this_hdr.contents = contents;
2170 free_contents = NULL;
2171
2172 symtab_hdr->contents = (bfd_byte *) isymbuf;
2173 }
2174
2175 if (free_relocs != NULL)
2176 {
2177 free (free_relocs);
2178 free_relocs = NULL;
2179 }
2180
2181 if (free_contents != NULL)
2182 {
2183 if (!link_info->keep_memory)
2184 free (free_contents);
2185 else
2186 /* Cache the section contents for elf_link_input_bfd. */
2187 elf_section_data (sec)->this_hdr.contents = contents;
2188 free_contents = NULL;
2189 }
2190
2191 if (sec->relax_count == 0)
2192 {
2193 *again = FALSE;
2194 free (sec->relax);
2195 sec->relax = NULL;
2196 }
2197 else
2198 *again = TRUE;
2199 return TRUE;
2200
2201 error_return:
2202 if (free_relocs != NULL)
2203 free (free_relocs);
2204 if (free_contents != NULL)
2205 free (free_contents);
2206 if (sec->relax != NULL)
2207 {
2208 free (sec->relax);
2209 sec->relax = NULL;
2210 sec->relax_count = 0;
2211 }
2212 return FALSE;
2213 }
2214
2215 /* Return the section that should be marked against GC for a given
2216 relocation. */
2217
2218 static asection *
microblaze_elf_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)2219 microblaze_elf_gc_mark_hook (asection *sec,
2220 struct bfd_link_info * info,
2221 Elf_Internal_Rela * rel,
2222 struct elf_link_hash_entry * h,
2223 Elf_Internal_Sym * sym)
2224 {
2225 if (h != NULL)
2226 switch (ELF32_R_TYPE (rel->r_info))
2227 {
2228 case R_MICROBLAZE_GNU_VTINHERIT:
2229 case R_MICROBLAZE_GNU_VTENTRY:
2230 return NULL;
2231 }
2232
2233 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2234 }
2235
2236 /* Update the got entry reference counts for the section being removed. */
2237
2238 static bfd_boolean
microblaze_elf_gc_sweep_hook(bfd * abfd ATTRIBUTE_UNUSED,struct bfd_link_info * info ATTRIBUTE_UNUSED,asection * sec ATTRIBUTE_UNUSED,const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)2239 microblaze_elf_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
2240 struct bfd_link_info * info ATTRIBUTE_UNUSED,
2241 asection * sec ATTRIBUTE_UNUSED,
2242 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
2243 {
2244 return TRUE;
2245 }
2246
2247 /* PIC support. */
2248
2249 #define PLT_ENTRY_SIZE 16
2250
2251 #define PLT_ENTRY_WORD_0 0xb0000000 /* "imm 0". */
2252 #define PLT_ENTRY_WORD_1 0xe9940000 /* "lwi r12,r20,0" - relocated to lwi r12,r20,func@GOT. */
2253 #define PLT_ENTRY_WORD_1_NOPIC 0xe9800000 /* "lwi r12,r0,0" - non-PIC object. */
2254 #define PLT_ENTRY_WORD_2 0x98186000 /* "brad r12". */
2255 #define PLT_ENTRY_WORD_3 0x80000000 /* "nop". */
2256
2257 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
2258 shortcuts to them in our hash table. */
2259
2260 static bfd_boolean
create_got_section(bfd * dynobj,struct bfd_link_info * info)2261 create_got_section (bfd *dynobj, struct bfd_link_info *info)
2262 {
2263 struct elf32_mb_link_hash_table *htab;
2264
2265 if (! _bfd_elf_create_got_section (dynobj, info))
2266 return FALSE;
2267 htab = elf32_mb_hash_table (info);
2268 if (htab == NULL)
2269 return FALSE;
2270
2271 htab->sgot = bfd_get_linker_section (dynobj, ".got");
2272 htab->sgotplt = bfd_get_linker_section (dynobj, ".got.plt");
2273 if (!htab->sgot || !htab->sgotplt)
2274 return FALSE;
2275
2276 if ((htab->srelgot = bfd_get_linker_section (dynobj, ".rela.got")) == NULL)
2277 htab->srelgot = bfd_make_section_anyway (dynobj, ".rela.got");
2278 if (htab->srelgot == NULL
2279 || ! bfd_set_section_flags (dynobj, htab->srelgot, SEC_ALLOC
2280 | SEC_LOAD
2281 | SEC_HAS_CONTENTS
2282 | SEC_IN_MEMORY
2283 | SEC_LINKER_CREATED
2284 | SEC_READONLY)
2285 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
2286 return FALSE;
2287 return TRUE;
2288 }
2289
2290 static bfd_boolean
update_local_sym_info(bfd * abfd,Elf_Internal_Shdr * symtab_hdr,unsigned long r_symndx,unsigned int tls_type)2291 update_local_sym_info (bfd *abfd,
2292 Elf_Internal_Shdr *symtab_hdr,
2293 unsigned long r_symndx,
2294 unsigned int tls_type)
2295 {
2296 bfd_signed_vma *local_got_refcounts = elf_local_got_refcounts (abfd);
2297 unsigned char *local_got_tls_masks;
2298
2299 if (local_got_refcounts == NULL)
2300 {
2301 bfd_size_type size = symtab_hdr->sh_info;
2302
2303 size *= (sizeof (*local_got_refcounts) + sizeof (*local_got_tls_masks));
2304 local_got_refcounts = bfd_zalloc (abfd, size);
2305 if (local_got_refcounts == NULL)
2306 return FALSE;
2307 elf_local_got_refcounts (abfd) = local_got_refcounts;
2308 }
2309
2310 local_got_tls_masks =
2311 (unsigned char *) (local_got_refcounts + symtab_hdr->sh_info);
2312 local_got_tls_masks[r_symndx] |= tls_type;
2313 local_got_refcounts[r_symndx] += 1;
2314
2315 return TRUE;
2316 }
2317 /* Look through the relocs for a section during the first phase. */
2318
2319 static bfd_boolean
microblaze_elf_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)2320 microblaze_elf_check_relocs (bfd * abfd,
2321 struct bfd_link_info * info,
2322 asection * sec,
2323 const Elf_Internal_Rela * relocs)
2324 {
2325 Elf_Internal_Shdr * symtab_hdr;
2326 struct elf_link_hash_entry ** sym_hashes;
2327 struct elf_link_hash_entry ** sym_hashes_end;
2328 const Elf_Internal_Rela * rel;
2329 const Elf_Internal_Rela * rel_end;
2330 struct elf32_mb_link_hash_table *htab;
2331 asection *sreloc = NULL;
2332
2333 if (bfd_link_relocatable (info))
2334 return TRUE;
2335
2336 htab = elf32_mb_hash_table (info);
2337 if (htab == NULL)
2338 return FALSE;
2339
2340 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
2341 sym_hashes = elf_sym_hashes (abfd);
2342 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
2343 if (!elf_bad_symtab (abfd))
2344 sym_hashes_end -= symtab_hdr->sh_info;
2345
2346 rel_end = relocs + sec->reloc_count;
2347
2348 for (rel = relocs; rel < rel_end; rel++)
2349 {
2350 unsigned int r_type;
2351 struct elf_link_hash_entry * h;
2352 unsigned long r_symndx;
2353 unsigned char tls_type = 0;
2354
2355 r_symndx = ELF32_R_SYM (rel->r_info);
2356 r_type = ELF32_R_TYPE (rel->r_info);
2357
2358 if (r_symndx < symtab_hdr->sh_info)
2359 h = NULL;
2360 else
2361 {
2362 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
2363
2364 /* PR15323, ref flags aren't set for references in the same
2365 object. */
2366 h->root.non_ir_ref = 1;
2367 }
2368
2369 switch (r_type)
2370 {
2371 /* This relocation describes the C++ object vtable hierarchy.
2372 Reconstruct it for later use during GC. */
2373 case R_MICROBLAZE_GNU_VTINHERIT:
2374 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2375 return FALSE;
2376 break;
2377
2378 /* This relocation describes which C++ vtable entries are actually
2379 used. Record for later use during GC. */
2380 case R_MICROBLAZE_GNU_VTENTRY:
2381 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2382 return FALSE;
2383 break;
2384
2385 /* This relocation requires .plt entry. */
2386 case R_MICROBLAZE_PLT_64:
2387 if (h != NULL)
2388 {
2389 h->needs_plt = 1;
2390 h->plt.refcount += 1;
2391 }
2392 break;
2393
2394 /* This relocation requires .got entry. */
2395 case R_MICROBLAZE_TLSGD:
2396 tls_type |= (TLS_TLS | TLS_GD);
2397 goto dogottls;
2398 case R_MICROBLAZE_TLSLD:
2399 tls_type |= (TLS_TLS | TLS_LD);
2400 dogottls:
2401 sec->has_tls_reloc = 1;
2402 case R_MICROBLAZE_GOT_64:
2403 if (htab->sgot == NULL)
2404 {
2405 if (htab->elf.dynobj == NULL)
2406 htab->elf.dynobj = abfd;
2407 if (!create_got_section (htab->elf.dynobj, info))
2408 return FALSE;
2409 }
2410 if (h != NULL)
2411 {
2412 h->got.refcount += 1;
2413 elf32_mb_hash_entry (h)->tls_mask |= tls_type;
2414 }
2415 else
2416 {
2417 if (! update_local_sym_info(abfd, symtab_hdr, r_symndx, tls_type) )
2418 return FALSE;
2419 }
2420 break;
2421
2422 case R_MICROBLAZE_64:
2423 case R_MICROBLAZE_64_PCREL:
2424 case R_MICROBLAZE_32:
2425 {
2426 if (h != NULL && !bfd_link_pic (info))
2427 {
2428 /* we may need a copy reloc. */
2429 h->non_got_ref = 1;
2430
2431 /* we may also need a .plt entry. */
2432 h->plt.refcount += 1;
2433 if (ELF32_R_TYPE (rel->r_info) != R_MICROBLAZE_64_PCREL)
2434 h->pointer_equality_needed = 1;
2435 }
2436
2437
2438 /* If we are creating a shared library, and this is a reloc
2439 against a global symbol, or a non PC relative reloc
2440 against a local symbol, then we need to copy the reloc
2441 into the shared library. However, if we are linking with
2442 -Bsymbolic, we do not need to copy a reloc against a
2443 global symbol which is defined in an object we are
2444 including in the link (i.e., DEF_REGULAR is set). At
2445 this point we have not seen all the input files, so it is
2446 possible that DEF_REGULAR is not set now but will be set
2447 later (it is never cleared). In case of a weak definition,
2448 DEF_REGULAR may be cleared later by a strong definition in
2449 a shared library. We account for that possibility below by
2450 storing information in the relocs_copied field of the hash
2451 table entry. A similar situation occurs when creating
2452 shared libraries and symbol visibility changes render the
2453 symbol local.
2454
2455 If on the other hand, we are creating an executable, we
2456 may need to keep relocations for symbols satisfied by a
2457 dynamic library if we manage to avoid copy relocs for the
2458 symbol. */
2459
2460 if ((bfd_link_pic (info)
2461 && (sec->flags & SEC_ALLOC) != 0
2462 && (r_type != R_MICROBLAZE_64_PCREL
2463 || (h != NULL
2464 && (! info->symbolic
2465 || h->root.type == bfd_link_hash_defweak
2466 || !h->def_regular))))
2467 || (!bfd_link_pic (info)
2468 && (sec->flags & SEC_ALLOC) != 0
2469 && h != NULL
2470 && (h->root.type == bfd_link_hash_defweak
2471 || !h->def_regular)))
2472 {
2473 struct elf32_mb_dyn_relocs *p;
2474 struct elf32_mb_dyn_relocs **head;
2475
2476 /* When creating a shared object, we must copy these
2477 relocs into the output file. We create a reloc
2478 section in dynobj and make room for the reloc. */
2479
2480 if (sreloc == NULL)
2481 {
2482 bfd *dynobj;
2483
2484 if (htab->elf.dynobj == NULL)
2485 htab->elf.dynobj = abfd;
2486 dynobj = htab->elf.dynobj;
2487
2488 sreloc = _bfd_elf_make_dynamic_reloc_section (sec, dynobj,
2489 2, abfd, 1);
2490 if (sreloc == NULL)
2491 return FALSE;
2492 }
2493
2494 /* If this is a global symbol, we count the number of
2495 relocations we need for this symbol. */
2496 if (h != NULL)
2497 head = &((struct elf32_mb_link_hash_entry *) h)->dyn_relocs;
2498 else
2499 {
2500 /* Track dynamic relocs needed for local syms too.
2501 We really need local syms available to do this
2502 easily. Oh well. */
2503
2504 asection *s;
2505 Elf_Internal_Sym *isym;
2506 void *vpp;
2507
2508 isym = bfd_sym_from_r_symndx (&htab->sym_sec,
2509 abfd, r_symndx);
2510 if (isym == NULL)
2511 return FALSE;
2512
2513 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2514 if (s == NULL)
2515 return FALSE;
2516
2517 vpp = &elf_section_data (s)->local_dynrel;
2518 head = (struct elf32_mb_dyn_relocs **) vpp;
2519 }
2520
2521 p = *head;
2522 if (p == NULL || p->sec != sec)
2523 {
2524 bfd_size_type amt = sizeof *p;
2525 p = ((struct elf32_mb_dyn_relocs *)
2526 bfd_alloc (htab->elf.dynobj, amt));
2527 if (p == NULL)
2528 return FALSE;
2529 p->next = *head;
2530 *head = p;
2531 p->sec = sec;
2532 p->count = 0;
2533 p->pc_count = 0;
2534 }
2535
2536 p->count += 1;
2537 if (r_type == R_MICROBLAZE_64_PCREL)
2538 p->pc_count += 1;
2539 }
2540 }
2541 break;
2542 }
2543 }
2544
2545 return TRUE;
2546 }
2547
2548 static bfd_boolean
microblaze_elf_create_dynamic_sections(bfd * dynobj,struct bfd_link_info * info)2549 microblaze_elf_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
2550 {
2551 struct elf32_mb_link_hash_table *htab;
2552
2553 htab = elf32_mb_hash_table (info);
2554 if (htab == NULL)
2555 return FALSE;
2556
2557 if (!htab->sgot && !create_got_section (dynobj, info))
2558 return FALSE;
2559
2560 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
2561 return FALSE;
2562
2563 htab->splt = bfd_get_linker_section (dynobj, ".plt");
2564 htab->srelplt = bfd_get_linker_section (dynobj, ".rela.plt");
2565 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
2566 if (!bfd_link_pic (info))
2567 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
2568
2569 if (!htab->splt || !htab->srelplt || !htab->sdynbss
2570 || (!bfd_link_pic (info) && !htab->srelbss))
2571 abort ();
2572
2573 return TRUE;
2574 }
2575
2576 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2577
2578 static void
microblaze_elf_copy_indirect_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * dir,struct elf_link_hash_entry * ind)2579 microblaze_elf_copy_indirect_symbol (struct bfd_link_info *info,
2580 struct elf_link_hash_entry *dir,
2581 struct elf_link_hash_entry *ind)
2582 {
2583 struct elf32_mb_link_hash_entry *edir, *eind;
2584
2585 edir = (struct elf32_mb_link_hash_entry *) dir;
2586 eind = (struct elf32_mb_link_hash_entry *) ind;
2587
2588 if (eind->dyn_relocs != NULL)
2589 {
2590 if (edir->dyn_relocs != NULL)
2591 {
2592 struct elf32_mb_dyn_relocs **pp;
2593 struct elf32_mb_dyn_relocs *p;
2594
2595 if (ind->root.type == bfd_link_hash_indirect)
2596 abort ();
2597
2598 /* Add reloc counts against the weak sym to the strong sym
2599 list. Merge any entries against the same section. */
2600 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
2601 {
2602 struct elf32_mb_dyn_relocs *q;
2603
2604 for (q = edir->dyn_relocs; q != NULL; q = q->next)
2605 if (q->sec == p->sec)
2606 {
2607 q->pc_count += p->pc_count;
2608 q->count += p->count;
2609 *pp = p->next;
2610 break;
2611 }
2612 if (q == NULL)
2613 pp = &p->next;
2614 }
2615 *pp = edir->dyn_relocs;
2616 }
2617
2618 edir->dyn_relocs = eind->dyn_relocs;
2619 eind->dyn_relocs = NULL;
2620 }
2621
2622 edir->tls_mask |= eind->tls_mask;
2623
2624 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
2625 }
2626
2627 static bfd_boolean
microblaze_elf_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)2628 microblaze_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
2629 struct elf_link_hash_entry *h)
2630 {
2631 struct elf32_mb_link_hash_table *htab;
2632 struct elf32_mb_link_hash_entry * eh;
2633 struct elf32_mb_dyn_relocs *p;
2634 asection *sdynbss, *s;
2635 unsigned int power_of_two;
2636 bfd *dynobj;
2637
2638 htab = elf32_mb_hash_table (info);
2639 if (htab == NULL)
2640 return FALSE;
2641
2642 /* If this is a function, put it in the procedure linkage table. We
2643 will fill in the contents of the procedure linkage table later,
2644 when we know the address of the .got section. */
2645 if (h->type == STT_FUNC
2646 || h->needs_plt)
2647 {
2648 if (h->plt.refcount <= 0
2649 || SYMBOL_CALLS_LOCAL (info, h)
2650 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2651 && h->root.type == bfd_link_hash_undefweak))
2652 {
2653 /* This case can occur if we saw a PLT reloc in an input
2654 file, but the symbol was never referred to by a dynamic
2655 object, or if all references were garbage collected. In
2656 such a case, we don't actually need to build a procedure
2657 linkage table, and we can just do a PC32 reloc instead. */
2658 h->plt.offset = (bfd_vma) -1;
2659 h->needs_plt = 0;
2660 }
2661
2662 return TRUE;
2663 }
2664 else
2665 /* It's possible that we incorrectly decided a .plt reloc was
2666 needed for an R_MICROBLAZE_64_PCREL reloc to a non-function sym in
2667 check_relocs. We can't decide accurately between function and
2668 non-function syms in check-relocs; Objects loaded later in
2669 the link may change h->type. So fix it now. */
2670 h->plt.offset = (bfd_vma) -1;
2671
2672 /* If this is a weak symbol, and there is a real definition, the
2673 processor independent code will have arranged for us to see the
2674 real definition first, and we can just use the same value. */
2675 if (h->u.weakdef != NULL)
2676 {
2677 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2678 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2679 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2680 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2681 return TRUE;
2682 }
2683
2684 /* This is a reference to a symbol defined by a dynamic object which
2685 is not a function. */
2686
2687 /* If we are creating a shared library, we must presume that the
2688 only references to the symbol are via the global offset table.
2689 For such cases we need not do anything here; the relocations will
2690 be handled correctly by relocate_section. */
2691 if (bfd_link_pic (info))
2692 return TRUE;
2693
2694 /* If there are no references to this symbol that do not use the
2695 GOT, we don't need to generate a copy reloc. */
2696 if (!h->non_got_ref)
2697 return TRUE;
2698
2699 /* If -z nocopyreloc was given, we won't generate them either. */
2700 if (info->nocopyreloc)
2701 {
2702 h->non_got_ref = 0;
2703 return TRUE;
2704 }
2705
2706 eh = (struct elf32_mb_link_hash_entry *) h;
2707 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2708 {
2709 s = p->sec->output_section;
2710 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2711 break;
2712 }
2713
2714 /* If we didn't find any dynamic relocs in read-only sections, then
2715 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2716 if (p == NULL)
2717 {
2718 h->non_got_ref = 0;
2719 return TRUE;
2720 }
2721
2722 /* We must allocate the symbol in our .dynbss section, which will
2723 become part of the .bss section of the executable. There will be
2724 an entry for this symbol in the .dynsym section. The dynamic
2725 object will contain position independent code, so all references
2726 from the dynamic object to this symbol will go through the global
2727 offset table. The dynamic linker will use the .dynsym entry to
2728 determine the address it must put in the global offset table, so
2729 both the dynamic object and the regular object will refer to the
2730 same memory location for the variable. */
2731
2732 /* We must generate a R_MICROBLAZE_COPY reloc to tell the dynamic linker
2733 to copy the initial value out of the dynamic object and into the
2734 runtime process image. */
2735 dynobj = elf_hash_table (info)->dynobj;
2736 BFD_ASSERT (dynobj != NULL);
2737 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2738 {
2739 htab->srelbss->size += sizeof (Elf32_External_Rela);
2740 h->needs_copy = 1;
2741 }
2742
2743 /* We need to figure out the alignment required for this symbol. I
2744 have no idea how ELF linkers handle this. */
2745 power_of_two = bfd_log2 (h->size);
2746 if (power_of_two > 3)
2747 power_of_two = 3;
2748
2749 sdynbss = htab->sdynbss;
2750 /* Apply the required alignment. */
2751 sdynbss->size = BFD_ALIGN (sdynbss->size, (bfd_size_type) (1 << power_of_two));
2752 if (power_of_two > bfd_get_section_alignment (dynobj, sdynbss))
2753 {
2754 if (! bfd_set_section_alignment (dynobj, sdynbss, power_of_two))
2755 return FALSE;
2756 }
2757
2758 /* Define the symbol as being at this point in the section. */
2759 h->root.u.def.section = sdynbss;
2760 h->root.u.def.value = sdynbss->size;
2761
2762 /* Increment the section size to make room for the symbol. */
2763 sdynbss->size += h->size;
2764 return TRUE;
2765 }
2766
2767 /* Allocate space in .plt, .got and associated reloc sections for
2768 dynamic relocs. */
2769
2770 static bfd_boolean
allocate_dynrelocs(struct elf_link_hash_entry * h,void * dat)2771 allocate_dynrelocs (struct elf_link_hash_entry *h, void * dat)
2772 {
2773 struct bfd_link_info *info;
2774 struct elf32_mb_link_hash_table *htab;
2775 struct elf32_mb_link_hash_entry *eh;
2776 struct elf32_mb_dyn_relocs *p;
2777
2778 if (h->root.type == bfd_link_hash_indirect)
2779 return TRUE;
2780
2781 info = (struct bfd_link_info *) dat;
2782 htab = elf32_mb_hash_table (info);
2783 if (htab == NULL)
2784 return FALSE;
2785
2786 if (htab->elf.dynamic_sections_created
2787 && h->plt.refcount > 0)
2788 {
2789 /* Make sure this symbol is output as a dynamic symbol.
2790 Undefined weak syms won't yet be marked as dynamic. */
2791 if (h->dynindx == -1
2792 && !h->forced_local)
2793 {
2794 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2795 return FALSE;
2796 }
2797
2798 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h))
2799 {
2800 asection *s = htab->splt;
2801
2802 /* The first entry in .plt is reserved. */
2803 if (s->size == 0)
2804 s->size = PLT_ENTRY_SIZE;
2805
2806 h->plt.offset = s->size;
2807
2808 /* If this symbol is not defined in a regular file, and we are
2809 not generating a shared library, then set the symbol to this
2810 location in the .plt. This is required to make function
2811 pointers compare as equal between the normal executable and
2812 the shared library. */
2813 if (! bfd_link_pic (info)
2814 && !h->def_regular)
2815 {
2816 h->root.u.def.section = s;
2817 h->root.u.def.value = h->plt.offset;
2818 }
2819
2820 /* Make room for this entry. */
2821 s->size += PLT_ENTRY_SIZE;
2822
2823 /* We also need to make an entry in the .got.plt section, which
2824 will be placed in the .got section by the linker script. */
2825 htab->sgotplt->size += 4;
2826
2827 /* We also need to make an entry in the .rel.plt section. */
2828 htab->srelplt->size += sizeof (Elf32_External_Rela);
2829 }
2830 else
2831 {
2832 h->plt.offset = (bfd_vma) -1;
2833 h->needs_plt = 0;
2834 }
2835 }
2836 else
2837 {
2838 h->plt.offset = (bfd_vma) -1;
2839 h->needs_plt = 0;
2840 }
2841
2842 eh = (struct elf32_mb_link_hash_entry *) h;
2843 if (h->got.refcount > 0)
2844 {
2845 unsigned int need;
2846 asection *s;
2847
2848 /* Make sure this symbol is output as a dynamic symbol.
2849 Undefined weak syms won't yet be marked as dynamic. */
2850 if (h->dynindx == -1
2851 && !h->forced_local)
2852 {
2853 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2854 return FALSE;
2855 }
2856
2857 need = 0;
2858 if ((eh->tls_mask & TLS_TLS) != 0)
2859 {
2860 /* Handle TLS Symbol */
2861 if ((eh->tls_mask & TLS_LD) != 0)
2862 {
2863 if (!eh->elf.def_dynamic)
2864 /* We'll just use htab->tlsld_got.offset. This should
2865 always be the case. It's a little odd if we have
2866 a local dynamic reloc against a non-local symbol. */
2867 htab->tlsld_got.refcount += 1;
2868 else
2869 need += 8;
2870 }
2871 if ((eh->tls_mask & TLS_GD) != 0)
2872 need += 8;
2873 }
2874 else
2875 {
2876 /* Regular (non-TLS) symbol */
2877 need += 4;
2878 }
2879 if (need == 0)
2880 {
2881 h->got.offset = (bfd_vma) -1;
2882 }
2883 else
2884 {
2885 s = htab->sgot;
2886 h->got.offset = s->size;
2887 s->size += need;
2888 htab->srelgot->size += need * (sizeof (Elf32_External_Rela) / 4);
2889 }
2890 }
2891 else
2892 h->got.offset = (bfd_vma) -1;
2893
2894 if (eh->dyn_relocs == NULL)
2895 return TRUE;
2896
2897 /* In the shared -Bsymbolic case, discard space allocated for
2898 dynamic pc-relative relocs against symbols which turn out to be
2899 defined in regular objects. For the normal shared case, discard
2900 space for pc-relative relocs that have become local due to symbol
2901 visibility changes. */
2902
2903 if (bfd_link_pic (info))
2904 {
2905 if (h->def_regular
2906 && (h->forced_local
2907 || info->symbolic))
2908 {
2909 struct elf32_mb_dyn_relocs **pp;
2910
2911 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2912 {
2913 p->count -= p->pc_count;
2914 p->pc_count = 0;
2915 if (p->count == 0)
2916 *pp = p->next;
2917 else
2918 pp = &p->next;
2919 }
2920 }
2921 }
2922 else
2923 {
2924 /* For the non-shared case, discard space for relocs against
2925 symbols which turn out to need copy relocs or are not
2926 dynamic. */
2927
2928 if (!h->non_got_ref
2929 && ((h->def_dynamic
2930 && !h->def_regular)
2931 || (htab->elf.dynamic_sections_created
2932 && (h->root.type == bfd_link_hash_undefweak
2933 || h->root.type == bfd_link_hash_undefined))))
2934 {
2935 /* Make sure this symbol is output as a dynamic symbol.
2936 Undefined weak syms won't yet be marked as dynamic. */
2937 if (h->dynindx == -1
2938 && !h->forced_local)
2939 {
2940 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2941 return FALSE;
2942 }
2943
2944 /* If that succeeded, we know we'll be keeping all the
2945 relocs. */
2946 if (h->dynindx != -1)
2947 goto keep;
2948 }
2949
2950 eh->dyn_relocs = NULL;
2951
2952 keep: ;
2953 }
2954
2955 /* Finally, allocate space. */
2956 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2957 {
2958 asection *sreloc = elf_section_data (p->sec)->sreloc;
2959 sreloc->size += p->count * sizeof (Elf32_External_Rela);
2960 }
2961
2962 return TRUE;
2963 }
2964
2965 /* Set the sizes of the dynamic sections. */
2966
2967 static bfd_boolean
microblaze_elf_size_dynamic_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)2968 microblaze_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2969 struct bfd_link_info *info)
2970 {
2971 struct elf32_mb_link_hash_table *htab;
2972 bfd *dynobj;
2973 asection *s;
2974 bfd *ibfd;
2975
2976 htab = elf32_mb_hash_table (info);
2977 if (htab == NULL)
2978 return FALSE;
2979
2980 dynobj = htab->elf.dynobj;
2981 BFD_ASSERT (dynobj != NULL);
2982
2983 /* Set up .got offsets for local syms, and space for local dynamic
2984 relocs. */
2985 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2986 {
2987 bfd_signed_vma *local_got;
2988 bfd_signed_vma *end_local_got;
2989 bfd_size_type locsymcount;
2990 Elf_Internal_Shdr *symtab_hdr;
2991 unsigned char *lgot_masks;
2992 asection *srel;
2993
2994 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2995 continue;
2996
2997 for (s = ibfd->sections; s != NULL; s = s->next)
2998 {
2999 struct elf32_mb_dyn_relocs *p;
3000
3001 for (p = ((struct elf32_mb_dyn_relocs *)
3002 elf_section_data (s)->local_dynrel);
3003 p != NULL;
3004 p = p->next)
3005 {
3006 if (!bfd_is_abs_section (p->sec)
3007 && bfd_is_abs_section (p->sec->output_section))
3008 {
3009 /* Input section has been discarded, either because
3010 it is a copy of a linkonce section or due to
3011 linker script /DISCARD/, so we'll be discarding
3012 the relocs too. */
3013 }
3014 else if (p->count != 0)
3015 {
3016 srel = elf_section_data (p->sec)->sreloc;
3017 srel->size += p->count * sizeof (Elf32_External_Rela);
3018 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
3019 info->flags |= DF_TEXTREL;
3020 }
3021 }
3022 }
3023
3024 local_got = elf_local_got_refcounts (ibfd);
3025 if (!local_got)
3026 continue;
3027
3028 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
3029 locsymcount = symtab_hdr->sh_info;
3030 end_local_got = local_got + locsymcount;
3031 lgot_masks = (unsigned char *) end_local_got;
3032 s = htab->sgot;
3033 srel = htab->srelgot;
3034
3035 for (; local_got < end_local_got; ++local_got, ++lgot_masks)
3036 {
3037 if (*local_got > 0)
3038 {
3039 unsigned int need = 0;
3040 if ((*lgot_masks & TLS_TLS) != 0)
3041 {
3042 if ((*lgot_masks & TLS_GD) != 0)
3043 need += 8;
3044 if ((*lgot_masks & TLS_LD) != 0)
3045 htab->tlsld_got.refcount += 1;
3046 }
3047 else
3048 need += 4;
3049
3050 if (need == 0)
3051 {
3052 *local_got = (bfd_vma) -1;
3053 }
3054 else
3055 {
3056 *local_got = s->size;
3057 s->size += need;
3058 if (bfd_link_pic (info))
3059 srel->size += need * (sizeof (Elf32_External_Rela) / 4);
3060 }
3061 }
3062 else
3063 *local_got = (bfd_vma) -1;
3064 }
3065 }
3066
3067 /* Allocate global sym .plt and .got entries, and space for global
3068 sym dynamic relocs. */
3069 elf_link_hash_traverse (elf_hash_table (info), allocate_dynrelocs, info);
3070
3071 if (htab->tlsld_got.refcount > 0)
3072 {
3073 htab->tlsld_got.offset = htab->sgot->size;
3074 htab->sgot->size += 8;
3075 if (bfd_link_pic (info))
3076 htab->srelgot->size += sizeof (Elf32_External_Rela);
3077 }
3078 else
3079 htab->tlsld_got.offset = (bfd_vma) -1;
3080
3081 if (elf_hash_table (info)->dynamic_sections_created)
3082 {
3083 /* Make space for the trailing nop in .plt. */
3084 if (htab->splt->size > 0)
3085 htab->splt->size += 4;
3086 }
3087
3088 /* The check_relocs and adjust_dynamic_symbol entry points have
3089 determined the sizes of the various dynamic sections. Allocate
3090 memory for them. */
3091 for (s = dynobj->sections; s != NULL; s = s->next)
3092 {
3093 const char *name;
3094 bfd_boolean strip = FALSE;
3095
3096 if ((s->flags & SEC_LINKER_CREATED) == 0)
3097 continue;
3098
3099 /* It's OK to base decisions on the section name, because none
3100 of the dynobj section names depend upon the input files. */
3101 name = bfd_get_section_name (dynobj, s);
3102
3103 if (strncmp (name, ".rela", 5) == 0)
3104 {
3105 if (s->size == 0)
3106 {
3107 /* If we don't need this section, strip it from the
3108 output file. This is to handle .rela.bss and
3109 .rela.plt. We must create it in
3110 create_dynamic_sections, because it must be created
3111 before the linker maps input sections to output
3112 sections. The linker does that before
3113 adjust_dynamic_symbol is called, and it is that
3114 function which decides whether anything needs to go
3115 into these sections. */
3116 strip = TRUE;
3117 }
3118 else
3119 {
3120 /* We use the reloc_count field as a counter if we need
3121 to copy relocs into the output file. */
3122 s->reloc_count = 0;
3123 }
3124 }
3125 else if (s != htab->splt && s != htab->sgot && s != htab->sgotplt)
3126 {
3127 /* It's not one of our sections, so don't allocate space. */
3128 continue;
3129 }
3130
3131 if (strip)
3132 {
3133 s->flags |= SEC_EXCLUDE;
3134 continue;
3135 }
3136
3137 /* Allocate memory for the section contents. */
3138 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
3139 Unused entries should be reclaimed before the section's contents
3140 are written out, but at the moment this does not happen. Thus in
3141 order to prevent writing out garbage, we initialise the section's
3142 contents to zero. */
3143 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3144 if (s->contents == NULL && s->size != 0)
3145 return FALSE;
3146 }
3147
3148 if (elf_hash_table (info)->dynamic_sections_created)
3149 {
3150 /* Add some entries to the .dynamic section. We fill in the
3151 values later, in microblaze_elf_finish_dynamic_sections, but we
3152 must add the entries now so that we get the correct size for
3153 the .dynamic section. The DT_DEBUG entry is filled in by the
3154 dynamic linker and used by the debugger. */
3155 #define add_dynamic_entry(TAG, VAL) \
3156 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3157
3158 if (bfd_link_executable (info))
3159 {
3160 if (!add_dynamic_entry (DT_DEBUG, 0))
3161 return FALSE;
3162 }
3163
3164 if (!add_dynamic_entry (DT_RELA, 0)
3165 || !add_dynamic_entry (DT_RELASZ, 0)
3166 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
3167 return FALSE;
3168
3169 if (htab->splt->size != 0)
3170 {
3171 if (!add_dynamic_entry (DT_PLTGOT, 0)
3172 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3173 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3174 || !add_dynamic_entry (DT_JMPREL, 0)
3175 || !add_dynamic_entry (DT_BIND_NOW, 1))
3176 return FALSE;
3177 }
3178
3179 if (info->flags & DF_TEXTREL)
3180 {
3181 if (!add_dynamic_entry (DT_TEXTREL, 0))
3182 return FALSE;
3183 }
3184 }
3185 #undef add_dynamic_entry
3186 return TRUE;
3187 }
3188
3189 /* Finish up dynamic symbol handling. We set the contents of various
3190 dynamic sections here. */
3191
3192 static bfd_boolean
microblaze_elf_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)3193 microblaze_elf_finish_dynamic_symbol (bfd *output_bfd,
3194 struct bfd_link_info *info,
3195 struct elf_link_hash_entry *h,
3196 Elf_Internal_Sym *sym)
3197 {
3198 struct elf32_mb_link_hash_table *htab;
3199 struct elf32_mb_link_hash_entry *eh = elf32_mb_hash_entry(h);
3200
3201 htab = elf32_mb_hash_table (info);
3202 if (htab == NULL)
3203 return FALSE;
3204
3205 if (h->plt.offset != (bfd_vma) -1)
3206 {
3207 asection *splt;
3208 asection *srela;
3209 asection *sgotplt;
3210 Elf_Internal_Rela rela;
3211 bfd_byte *loc;
3212 bfd_vma plt_index;
3213 bfd_vma got_offset;
3214 bfd_vma got_addr;
3215
3216 /* This symbol has an entry in the procedure linkage table. Set
3217 it up. */
3218 BFD_ASSERT (h->dynindx != -1);
3219
3220 splt = htab->splt;
3221 srela = htab->srelplt;
3222 sgotplt = htab->sgotplt;
3223 BFD_ASSERT (splt != NULL && srela != NULL && sgotplt != NULL);
3224
3225 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; /* first entry reserved. */
3226 got_offset = (plt_index + 3) * 4; /* 3 reserved ??? */
3227 got_addr = got_offset;
3228
3229 /* For non-PIC objects we need absolute address of the GOT entry. */
3230 if (!bfd_link_pic (info))
3231 got_addr += htab->sgotplt->output_section->vma + sgotplt->output_offset;
3232
3233 /* Fill in the entry in the procedure linkage table. */
3234 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_0 + ((got_addr >> 16) & 0xffff),
3235 splt->contents + h->plt.offset);
3236 if (bfd_link_pic (info))
3237 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_1 + (got_addr & 0xffff),
3238 splt->contents + h->plt.offset + 4);
3239 else
3240 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_1_NOPIC + (got_addr & 0xffff),
3241 splt->contents + h->plt.offset + 4);
3242 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD_2,
3243 splt->contents + h->plt.offset + 8);
3244 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD_3,
3245 splt->contents + h->plt.offset + 12);
3246
3247 /* Any additions to the .got section??? */
3248 /* bfd_put_32 (output_bfd,
3249 splt->output_section->vma + splt->output_offset + h->plt.offset + 4,
3250 sgotplt->contents + got_offset); */
3251
3252 /* Fill in the entry in the .rela.plt section. */
3253 rela.r_offset = (sgotplt->output_section->vma
3254 + sgotplt->output_offset
3255 + got_offset);
3256 rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_JUMP_SLOT);
3257 rela.r_addend = 0;
3258 loc = srela->contents;
3259 loc += plt_index * sizeof (Elf32_External_Rela);
3260 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3261
3262 if (!h->def_regular)
3263 {
3264 /* Mark the symbol as undefined, rather than as defined in
3265 the .plt section. Zero the value. */
3266 sym->st_shndx = SHN_UNDEF;
3267 sym->st_value = 0;
3268 }
3269 }
3270
3271 /* h->got.refcount to be checked ? */
3272 if (h->got.offset != (bfd_vma) -1 &&
3273 ! ((h->got.offset & 1) ||
3274 IS_TLS_LD(eh->tls_mask) || IS_TLS_GD(eh->tls_mask)))
3275 {
3276 asection *sgot;
3277 asection *srela;
3278 bfd_vma offset;
3279
3280 /* This symbol has an entry in the global offset table. Set it
3281 up. */
3282
3283 sgot = htab->sgot;
3284 srela = htab->srelgot;
3285 BFD_ASSERT (sgot != NULL && srela != NULL);
3286
3287 offset = (sgot->output_section->vma + sgot->output_offset
3288 + (h->got.offset &~ (bfd_vma) 1));
3289
3290 /* If this is a -Bsymbolic link, and the symbol is defined
3291 locally, we just want to emit a RELATIVE reloc. Likewise if
3292 the symbol was forced to be local because of a version file.
3293 The entry in the global offset table will already have been
3294 initialized in the relocate_section function. */
3295 if (bfd_link_pic (info)
3296 && ((info->symbolic && h->def_regular)
3297 || h->dynindx == -1))
3298 {
3299 asection *sec = h->root.u.def.section;
3300 microblaze_elf_output_dynamic_relocation (output_bfd,
3301 srela, srela->reloc_count++,
3302 /* symindex= */ 0,
3303 R_MICROBLAZE_REL, offset,
3304 h->root.u.def.value
3305 + sec->output_section->vma
3306 + sec->output_offset);
3307 }
3308 else
3309 {
3310 microblaze_elf_output_dynamic_relocation (output_bfd,
3311 srela, srela->reloc_count++,
3312 h->dynindx,
3313 R_MICROBLAZE_GLOB_DAT,
3314 offset, 0);
3315 }
3316
3317 bfd_put_32 (output_bfd, (bfd_vma) 0,
3318 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
3319 }
3320
3321 if (h->needs_copy)
3322 {
3323 asection *s;
3324 Elf_Internal_Rela rela;
3325 bfd_byte *loc;
3326
3327 /* This symbols needs a copy reloc. Set it up. */
3328
3329 BFD_ASSERT (h->dynindx != -1);
3330
3331 s = bfd_get_linker_section (htab->elf.dynobj, ".rela.bss");
3332 BFD_ASSERT (s != NULL);
3333
3334 rela.r_offset = (h->root.u.def.value
3335 + h->root.u.def.section->output_section->vma
3336 + h->root.u.def.section->output_offset);
3337 rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_COPY);
3338 rela.r_addend = 0;
3339 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
3340 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3341 }
3342
3343 /* Mark some specially defined symbols as absolute. */
3344 if (h == htab->elf.hdynamic
3345 || h == htab->elf.hgot
3346 || h == htab->elf.hplt)
3347 sym->st_shndx = SHN_ABS;
3348
3349 return TRUE;
3350 }
3351
3352
3353 /* Finish up the dynamic sections. */
3354
3355 static bfd_boolean
microblaze_elf_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)3356 microblaze_elf_finish_dynamic_sections (bfd *output_bfd,
3357 struct bfd_link_info *info)
3358 {
3359 bfd *dynobj;
3360 asection *sdyn, *sgot;
3361 struct elf32_mb_link_hash_table *htab;
3362
3363 htab = elf32_mb_hash_table (info);
3364 if (htab == NULL)
3365 return FALSE;
3366
3367 dynobj = htab->elf.dynobj;
3368
3369 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3370
3371 if (htab->elf.dynamic_sections_created)
3372 {
3373 asection *splt;
3374 Elf32_External_Dyn *dyncon, *dynconend;
3375
3376 splt = bfd_get_linker_section (dynobj, ".plt");
3377 BFD_ASSERT (splt != NULL && sdyn != NULL);
3378
3379 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3380 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3381 for (; dyncon < dynconend; dyncon++)
3382 {
3383 Elf_Internal_Dyn dyn;
3384 const char *name;
3385 bfd_boolean size;
3386
3387 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3388
3389 switch (dyn.d_tag)
3390 {
3391 case DT_PLTGOT: name = ".got.plt"; size = FALSE; break;
3392 case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break;
3393 case DT_JMPREL: name = ".rela.plt"; size = FALSE; break;
3394 case DT_RELA: name = ".rela.dyn"; size = FALSE; break;
3395 case DT_RELASZ: name = ".rela.dyn"; size = TRUE; break;
3396 default: name = NULL; size = FALSE; break;
3397 }
3398
3399 if (name != NULL)
3400 {
3401 asection *s;
3402
3403 s = bfd_get_linker_section (dynobj, name);
3404 if (s == NULL)
3405 dyn.d_un.d_val = 0;
3406 else
3407 {
3408 if (! size)
3409 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3410 else
3411 dyn.d_un.d_val = s->size;
3412 }
3413 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3414 }
3415 }
3416
3417 /* Clear the first entry in the procedure linkage table,
3418 and put a nop in the last four bytes. */
3419 if (splt->size > 0)
3420 {
3421 memset (splt->contents, 0, PLT_ENTRY_SIZE);
3422 bfd_put_32 (output_bfd, (bfd_vma) 0x80000000 /* nop. */,
3423 splt->contents + splt->size - 4);
3424 }
3425
3426 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
3427 }
3428
3429 /* Set the first entry in the global offset table to the address of
3430 the dynamic section. */
3431 sgot = bfd_get_linker_section (dynobj, ".got.plt");
3432 if (sgot && sgot->size > 0)
3433 {
3434 if (sdyn == NULL)
3435 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
3436 else
3437 bfd_put_32 (output_bfd,
3438 sdyn->output_section->vma + sdyn->output_offset,
3439 sgot->contents);
3440 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
3441 }
3442
3443 if (htab->sgot && htab->sgot->size > 0)
3444 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
3445
3446 return TRUE;
3447 }
3448
3449 /* Hook called by the linker routine which adds symbols from an object
3450 file. We use it to put .comm items in .sbss, and not .bss. */
3451
3452 static bfd_boolean
microblaze_elf_add_symbol_hook(bfd * abfd,struct bfd_link_info * info,Elf_Internal_Sym * sym,const char ** namep ATTRIBUTE_UNUSED,flagword * flagsp ATTRIBUTE_UNUSED,asection ** secp,bfd_vma * valp)3453 microblaze_elf_add_symbol_hook (bfd *abfd,
3454 struct bfd_link_info *info,
3455 Elf_Internal_Sym *sym,
3456 const char **namep ATTRIBUTE_UNUSED,
3457 flagword *flagsp ATTRIBUTE_UNUSED,
3458 asection **secp,
3459 bfd_vma *valp)
3460 {
3461 if (sym->st_shndx == SHN_COMMON
3462 && !bfd_link_relocatable (info)
3463 && sym->st_size <= elf_gp_size (abfd))
3464 {
3465 /* Common symbols less than or equal to -G nn bytes are automatically
3466 put into .sbss. */
3467 *secp = bfd_make_section_old_way (abfd, ".sbss");
3468 if (*secp == NULL
3469 || ! bfd_set_section_flags (abfd, *secp, SEC_IS_COMMON))
3470 return FALSE;
3471
3472 *valp = sym->st_size;
3473 }
3474
3475 return TRUE;
3476 }
3477
3478 #define TARGET_LITTLE_SYM microblaze_elf32_le_vec
3479 #define TARGET_LITTLE_NAME "elf32-microblazeel"
3480
3481 #define TARGET_BIG_SYM microblaze_elf32_vec
3482 #define TARGET_BIG_NAME "elf32-microblaze"
3483
3484 #define ELF_ARCH bfd_arch_microblaze
3485 #define ELF_TARGET_ID MICROBLAZE_ELF_DATA
3486 #define ELF_MACHINE_CODE EM_MICROBLAZE
3487 #define ELF_MACHINE_ALT1 EM_MICROBLAZE_OLD
3488 #define ELF_MAXPAGESIZE 0x1000
3489 #define elf_info_to_howto microblaze_elf_info_to_howto
3490 #define elf_info_to_howto_rel NULL
3491
3492 #define bfd_elf32_bfd_reloc_type_lookup microblaze_elf_reloc_type_lookup
3493 #define bfd_elf32_bfd_is_local_label_name microblaze_elf_is_local_label_name
3494 #define elf_backend_relocate_section microblaze_elf_relocate_section
3495 #define bfd_elf32_bfd_relax_section microblaze_elf_relax_section
3496 #define bfd_elf32_bfd_merge_private_bfd_data microblaze_elf_merge_private_bfd_data
3497 #define bfd_elf32_bfd_reloc_name_lookup microblaze_elf_reloc_name_lookup
3498
3499 #define elf_backend_gc_mark_hook microblaze_elf_gc_mark_hook
3500 #define elf_backend_gc_sweep_hook microblaze_elf_gc_sweep_hook
3501 #define elf_backend_check_relocs microblaze_elf_check_relocs
3502 #define elf_backend_copy_indirect_symbol microblaze_elf_copy_indirect_symbol
3503 #define bfd_elf32_bfd_link_hash_table_create microblaze_elf_link_hash_table_create
3504 #define elf_backend_can_gc_sections 1
3505 #define elf_backend_can_refcount 1
3506 #define elf_backend_want_got_plt 1
3507 #define elf_backend_plt_readonly 1
3508 #define elf_backend_got_header_size 12
3509 #define elf_backend_rela_normal 1
3510
3511 #define elf_backend_adjust_dynamic_symbol microblaze_elf_adjust_dynamic_symbol
3512 #define elf_backend_create_dynamic_sections microblaze_elf_create_dynamic_sections
3513 #define elf_backend_finish_dynamic_sections microblaze_elf_finish_dynamic_sections
3514 #define elf_backend_finish_dynamic_symbol microblaze_elf_finish_dynamic_symbol
3515 #define elf_backend_size_dynamic_sections microblaze_elf_size_dynamic_sections
3516 #define elf_backend_add_symbol_hook microblaze_elf_add_symbol_hook
3517
3518 #include "elf32-target.h"
3519