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