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* objcopy.c (add_redefine_syms_file): Avoid symbol buffer
[deliverable/binutils-gdb.git] / bfd / elf32-microblaze.c
1 /* Xilinx MicroBlaze-specific support for 32-bit ELF
2
3 Copyright 2009 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 "bfd.h"
26 #include "sysdep.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
375 #ifndef NUM_ELEM
376 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
377 #endif
378 \f
379 /* Initialize the microblaze_elf_howto_table, so that linear accesses can be done. */
380
381 static void
382 microblaze_elf_howto_init (void)
383 {
384 unsigned int i;
385
386 for (i = NUM_ELEM (microblaze_elf_howto_raw); i--;)
387 {
388 unsigned int type;
389
390 type = microblaze_elf_howto_raw[i].type;
391
392 BFD_ASSERT (type < NUM_ELEM (microblaze_elf_howto_table));
393
394 microblaze_elf_howto_table [type] = & microblaze_elf_howto_raw [i];
395 }
396 }
397 \f
398 static reloc_howto_type *
399 microblaze_elf_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
400 bfd_reloc_code_real_type code)
401 {
402 enum elf_microblaze_reloc_type microblaze_reloc = R_MICROBLAZE_NONE;
403
404 switch (code)
405 {
406 case BFD_RELOC_NONE:
407 microblaze_reloc = R_MICROBLAZE_NONE;
408 break;
409 case BFD_RELOC_MICROBLAZE_64_NONE:
410 microblaze_reloc = R_MICROBLAZE_64_NONE;
411 break;
412 case BFD_RELOC_32:
413 microblaze_reloc = R_MICROBLAZE_32;
414 break;
415 /* RVA is treated the same as 32 */
416 case BFD_RELOC_RVA:
417 microblaze_reloc = R_MICROBLAZE_32;
418 break;
419 case BFD_RELOC_32_PCREL:
420 microblaze_reloc = R_MICROBLAZE_32_PCREL;
421 break;
422 case BFD_RELOC_64_PCREL:
423 microblaze_reloc = R_MICROBLAZE_64_PCREL;
424 break;
425 case BFD_RELOC_MICROBLAZE_32_LO_PCREL:
426 microblaze_reloc = R_MICROBLAZE_32_PCREL_LO;
427 break;
428 case BFD_RELOC_64:
429 microblaze_reloc = R_MICROBLAZE_64;
430 break;
431 case BFD_RELOC_MICROBLAZE_32_LO:
432 microblaze_reloc = R_MICROBLAZE_32_LO;
433 break;
434 case BFD_RELOC_MICROBLAZE_32_ROSDA:
435 microblaze_reloc = R_MICROBLAZE_SRO32;
436 break;
437 case BFD_RELOC_MICROBLAZE_32_RWSDA:
438 microblaze_reloc = R_MICROBLAZE_SRW32;
439 break;
440 case BFD_RELOC_MICROBLAZE_32_SYM_OP_SYM:
441 microblaze_reloc = R_MICROBLAZE_32_SYM_OP_SYM;
442 break;
443 case BFD_RELOC_VTABLE_INHERIT:
444 microblaze_reloc = R_MICROBLAZE_GNU_VTINHERIT;
445 break;
446 case BFD_RELOC_VTABLE_ENTRY:
447 microblaze_reloc = R_MICROBLAZE_GNU_VTENTRY;
448 break;
449 case BFD_RELOC_MICROBLAZE_64_GOTPC:
450 microblaze_reloc = R_MICROBLAZE_GOTPC_64;
451 break;
452 case BFD_RELOC_MICROBLAZE_64_GOT:
453 microblaze_reloc = R_MICROBLAZE_GOT_64;
454 break;
455 case BFD_RELOC_MICROBLAZE_64_PLT:
456 microblaze_reloc = R_MICROBLAZE_PLT_64;
457 break;
458 case BFD_RELOC_MICROBLAZE_64_GOTOFF:
459 microblaze_reloc = R_MICROBLAZE_GOTOFF_64;
460 break;
461 case BFD_RELOC_MICROBLAZE_32_GOTOFF:
462 microblaze_reloc = R_MICROBLAZE_GOTOFF_32;
463 break;
464 case BFD_RELOC_MICROBLAZE_COPY:
465 microblaze_reloc = R_MICROBLAZE_COPY;
466 break;
467 default:
468 return (reloc_howto_type *) NULL;
469 }
470
471 if (!microblaze_elf_howto_table [R_MICROBLAZE_32])
472 /* Initialize howto table if needed. */
473 microblaze_elf_howto_init ();
474
475 return microblaze_elf_howto_table [(int) microblaze_reloc];
476 };
477
478 static reloc_howto_type *
479 microblaze_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
480 const char *r_name)
481 {
482 unsigned int i;
483
484 for (i = 0; i < NUM_ELEM (microblaze_elf_howto_raw); i++)
485 if (microblaze_elf_howto_raw[i].name != NULL
486 && strcasecmp (microblaze_elf_howto_raw[i].name, r_name) == 0)
487 return &microblaze_elf_howto_raw[i];
488
489 return NULL;
490 }
491
492 /* Set the howto pointer for a RCE ELF reloc. */
493
494 static void
495 microblaze_elf_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED,
496 arelent * cache_ptr,
497 Elf_Internal_Rela * dst)
498 {
499 if (!microblaze_elf_howto_table [R_MICROBLAZE_32])
500 /* Initialize howto table if needed. */
501 microblaze_elf_howto_init ();
502
503 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_MICROBLAZE_max);
504
505 cache_ptr->howto = microblaze_elf_howto_table [ELF32_R_TYPE (dst->r_info)];
506 }
507
508 /* Microblaze ELF local labels start with 'L.' or '$L', not '.L'. */
509
510 static bfd_boolean
511 microblaze_elf_is_local_label_name (bfd *abfd, const char *name)
512 {
513 if (name[0] == 'L' && name[1] == '.')
514 return TRUE;
515
516 if (name[0] == '$' && name[1] == 'L')
517 return TRUE;
518
519 /* With gcc, the labels go back to starting with '.', so we accept
520 the generic ELF local label syntax as well. */
521 return _bfd_elf_is_local_label_name (abfd, name);
522 }
523
524 /* The microblaze linker (like many others) needs to keep track of
525 the number of relocs that it decides to copy as dynamic relocs in
526 check_relocs for each symbol. This is so that it can later discard
527 them if they are found to be unnecessary. We store the information
528 in a field extending the regular ELF linker hash table. */
529
530 struct elf32_mb_dyn_relocs
531 {
532 struct elf32_mb_dyn_relocs *next;
533
534 /* The input section of the reloc. */
535 asection *sec;
536
537 /* Total number of relocs copied for the input section. */
538 bfd_size_type count;
539
540 /* Number of pc-relative relocs copied for the input section. */
541 bfd_size_type pc_count;
542 };
543
544 /* ELF linker hash entry. */
545
546 struct elf32_mb_link_hash_entry
547 {
548 struct elf_link_hash_entry elf;
549
550 /* Track dynamic relocs copied for this symbol. */
551 struct elf32_mb_dyn_relocs *dyn_relocs;
552
553 };
554
555 #define elf32_mb_hash_entry(ent) ((struct elf32_mb_link_hash_entry *)(ent))
556
557 /* ELF linker hash table. */
558
559 struct elf32_mb_link_hash_table
560 {
561 struct elf_link_hash_table elf;
562
563 /* Short-cuts to get to dynamic linker sections. */
564 asection *sgot;
565 asection *sgotplt;
566 asection *srelgot;
567 asection *splt;
568 asection *srelplt;
569 asection *sdynbss;
570 asection *srelbss;
571
572 /* Small local sym to section mapping cache. */
573 struct sym_cache sym_sec;
574 };
575
576 /* Get the ELF linker hash table from a link_info structure. */
577
578 #define elf32_mb_hash_table(p) \
579 ((struct elf32_mb_link_hash_table *) ((p)->hash))
580
581 /* Create an entry in a microblaze ELF linker hash table. */
582
583 static struct bfd_hash_entry *
584 link_hash_newfunc (struct bfd_hash_entry *entry,
585 struct bfd_hash_table *table,
586 const char *string)
587 {
588 /* Allocate the structure if it has not already been allocated by a
589 subclass. */
590 if (entry == NULL)
591 {
592 entry = bfd_hash_allocate (table,
593 sizeof (struct elf32_mb_link_hash_entry));
594 if (entry == NULL)
595 return entry;
596 }
597
598 /* Call the allocation method of the superclass. */
599 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
600 if (entry != NULL)
601 {
602 struct elf32_mb_link_hash_entry *eh;
603
604 eh = (struct elf32_mb_link_hash_entry *) entry;
605 eh->dyn_relocs = NULL;
606 }
607
608 return entry;
609 }
610
611 /* Create a mb ELF linker hash table. */
612
613 static struct bfd_link_hash_table *
614 microblaze_elf_link_hash_table_create (bfd *abfd)
615 {
616 struct elf32_mb_link_hash_table *ret;
617 bfd_size_type amt = sizeof (struct elf32_mb_link_hash_table);
618
619 ret = (struct elf32_mb_link_hash_table *) bfd_zmalloc (amt);
620 if (ret == NULL)
621 return NULL;
622
623 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
624 sizeof (struct elf32_mb_link_hash_entry)))
625 {
626 free (ret);
627 return NULL;
628 }
629
630 return &ret->elf.root;
631 }
632 \f
633 /* Set the values of the small data pointers. */
634
635 static void
636 microblaze_elf_final_sdp (struct bfd_link_info *info)
637 {
638 struct bfd_link_hash_entry *h;
639
640 h = bfd_link_hash_lookup (info->hash, RO_SDA_ANCHOR_NAME, FALSE, FALSE, TRUE);
641 if (h != (struct bfd_link_hash_entry *) NULL
642 && h->type == bfd_link_hash_defined)
643 ro_small_data_pointer = (h->u.def.value
644 + h->u.def.section->output_section->vma
645 + h->u.def.section->output_offset);
646
647 h = bfd_link_hash_lookup (info->hash, RW_SDA_ANCHOR_NAME, FALSE, FALSE, TRUE);
648 if (h != (struct bfd_link_hash_entry *) NULL
649 && h->type == bfd_link_hash_defined)
650 rw_small_data_pointer = (h->u.def.value
651 + h->u.def.section->output_section->vma
652 + h->u.def.section->output_offset);
653 }
654
655 /* This code is taken from elf32-m32r.c
656 There is some attempt to make this function usable for many architectures,
657 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
658 if only to serve as a learning tool.
659
660 The RELOCATE_SECTION function is called by the new ELF backend linker
661 to handle the relocations for a section.
662
663 The relocs are always passed as Rela structures; if the section
664 actually uses Rel structures, the r_addend field will always be
665 zero.
666
667 This function is responsible for adjust the section contents as
668 necessary, and (if using Rela relocs and generating a
669 relocatable output file) adjusting the reloc addend as
670 necessary.
671
672 This function does not have to worry about setting the reloc
673 address or the reloc symbol index.
674
675 LOCAL_SYMS is a pointer to the swapped in local symbols.
676
677 LOCAL_SECTIONS is an array giving the section in the input file
678 corresponding to the st_shndx field of each local symbol.
679
680 The global hash table entry for the global symbols can be found
681 via elf_sym_hashes (input_bfd).
682
683 When generating relocatable output, this function must handle
684 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
685 going to be the section symbol corresponding to the output
686 section, which means that the addend must be adjusted
687 accordingly. */
688
689 static bfd_boolean
690 microblaze_elf_relocate_section (bfd *output_bfd,
691 struct bfd_link_info *info,
692 bfd *input_bfd,
693 asection *input_section,
694 bfd_byte *contents,
695 Elf_Internal_Rela *relocs,
696 Elf_Internal_Sym *local_syms,
697 asection **local_sections)
698 {
699 struct elf32_mb_link_hash_table *htab;
700 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
701 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
702 Elf_Internal_Rela *rel, *relend;
703 /* Assume success. */
704 bfd_boolean ret = TRUE;
705 asection *sreloc;
706 bfd_vma *local_got_offsets;
707
708 if (!microblaze_elf_howto_table[R_MICROBLAZE_max-1])
709 microblaze_elf_howto_init ();
710
711 htab = elf32_mb_hash_table (info);
712 local_got_offsets = elf_local_got_offsets (input_bfd);
713
714 sreloc = elf_section_data (input_section)->sreloc;
715
716 rel = relocs;
717 relend = relocs + input_section->reloc_count;
718 for (; rel < relend; rel++)
719 {
720 int r_type;
721 reloc_howto_type *howto;
722 unsigned long r_symndx;
723 bfd_vma addend = rel->r_addend;
724 bfd_vma offset = rel->r_offset;
725 struct elf_link_hash_entry *h;
726 Elf_Internal_Sym *sym;
727 asection *sec;
728 const char *sym_name;
729 bfd_reloc_status_type r = bfd_reloc_ok;
730 const char *errmsg = NULL;
731 bfd_boolean unresolved_reloc = FALSE;
732
733 h = NULL;
734 r_type = ELF32_R_TYPE (rel->r_info);
735 if (r_type < 0 || r_type >= (int) R_MICROBLAZE_max)
736 {
737 (*_bfd_error_handler) (_("%s: unknown relocation type %d"),
738 bfd_get_filename (input_bfd), (int) r_type);
739 bfd_set_error (bfd_error_bad_value);
740 ret = FALSE;
741 continue;
742 }
743
744 howto = microblaze_elf_howto_table[r_type];
745 r_symndx = ELF32_R_SYM (rel->r_info);
746
747 if (info->relocatable)
748 {
749 /* This is a relocatable link. We don't have to change
750 anything, unless the reloc is against a section symbol,
751 in which case we have to adjust according to where the
752 section symbol winds up in the output section. */
753 sec = NULL;
754 if (r_symndx >= symtab_hdr->sh_info)
755 /* External symbol. */
756 continue;
757
758 /* Local symbol. */
759 sym = local_syms + r_symndx;
760 sym_name = "<local symbol>";
761 /* STT_SECTION: symbol is associated with a section. */
762 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
763 /* Symbol isn't associated with a section. Nothing to do. */
764 continue;
765
766 sec = local_sections[r_symndx];
767 addend += sec->output_offset + sym->st_value;
768 #ifndef USE_REL
769 /* This can't be done for USE_REL because it doesn't mean anything
770 and elf_link_input_bfd asserts this stays zero. */
771 /* rel->r_addend = addend; */
772 #endif
773
774 #ifndef USE_REL
775 /* Addends are stored with relocs. We're done. */
776 continue;
777 #else /* USE_REL */
778 /* If partial_inplace, we need to store any additional addend
779 back in the section. */
780 if (!howto->partial_inplace)
781 continue;
782 /* ??? Here is a nice place to call a special_function like handler. */
783 r = _bfd_relocate_contents (howto, input_bfd, addend,
784 contents + offset);
785 #endif /* USE_REL */
786 }
787 else
788 {
789 bfd_vma relocation;
790
791 /* This is a final link. */
792 sym = NULL;
793 sec = NULL;
794 unresolved_reloc = FALSE;
795
796 if (r_symndx < symtab_hdr->sh_info)
797 {
798 /* Local symbol. */
799 sym = local_syms + r_symndx;
800 sec = local_sections[r_symndx];
801 if (sec == 0)
802 continue;
803 sym_name = "<local symbol>";
804 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
805 /* r_addend may have changed if the reference section was
806 a merge section. */
807 addend = rel->r_addend;
808 }
809 else
810 {
811 /* External symbol. */
812 bfd_boolean warned ATTRIBUTE_UNUSED;
813
814 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
815 r_symndx, symtab_hdr, sym_hashes,
816 h, sec, relocation,
817 unresolved_reloc, warned);
818 sym_name = h->root.root.string;
819 }
820
821 /* Sanity check the address. */
822 if (offset > bfd_get_section_limit (output_bfd, input_section))
823 {
824 r = bfd_reloc_outofrange;
825 goto check_reloc;
826 }
827
828 switch ((int) r_type)
829 {
830 case (int) R_MICROBLAZE_SRO32 :
831 {
832 const char *name;
833
834 /* Only relocate if the symbol is defined. */
835 if (sec)
836 {
837 name = bfd_get_section_name (abfd, sec);
838
839 if (strcmp (name, ".sdata2") == 0
840 || strcmp (name, ".sbss2") == 0)
841 {
842 if (ro_small_data_pointer == 0)
843 microblaze_elf_final_sdp (info);
844 if (ro_small_data_pointer == 0)
845 {
846 ret = FALSE;
847 r = bfd_reloc_undefined;
848 goto check_reloc;
849 }
850
851 /* At this point `relocation' contains the object's
852 address. */
853 relocation -= ro_small_data_pointer;
854 /* Now it contains the offset from _SDA2_BASE_. */
855 r = _bfd_final_link_relocate (howto, input_bfd,
856 input_section,
857 contents, offset,
858 relocation, addend);
859 }
860 else
861 {
862 (*_bfd_error_handler) (_("%s: The target (%s) of an %s relocation is in the wrong section (%s)"),
863 bfd_get_filename (input_bfd),
864 sym_name,
865 microblaze_elf_howto_table[(int) r_type]->name,
866 bfd_get_section_name (abfd, sec));
867 /*bfd_set_error (bfd_error_bad_value); ??? why? */
868 ret = FALSE;
869 continue;
870 }
871 }
872 }
873 break;
874
875 case (int) R_MICROBLAZE_SRW32 :
876 {
877 const char *name;
878
879 /* Only relocate if the symbol is defined. */
880 if (sec)
881 {
882 name = bfd_get_section_name (abfd, sec);
883
884 if (strcmp (name, ".sdata") == 0
885 || strcmp (name, ".sbss") == 0)
886 {
887 if (rw_small_data_pointer == 0)
888 microblaze_elf_final_sdp (info);
889 if (rw_small_data_pointer == 0)
890 {
891 ret = FALSE;
892 r = bfd_reloc_undefined;
893 goto check_reloc;
894 }
895
896 /* At this point `relocation' contains the object's
897 address. */
898 relocation -= rw_small_data_pointer;
899 /* Now it contains the offset from _SDA_BASE_. */
900 r = _bfd_final_link_relocate (howto, input_bfd,
901 input_section,
902 contents, offset,
903 relocation, addend);
904 }
905 else
906 {
907 (*_bfd_error_handler) (_("%s: The target (%s) of an %s relocation is in the wrong section (%s)"),
908 bfd_get_filename (input_bfd),
909 sym_name,
910 microblaze_elf_howto_table[(int) r_type]->name,
911 bfd_get_section_name (abfd, sec));
912 /*bfd_set_error (bfd_error_bad_value); ??? why? */
913 ret = FALSE;
914 continue;
915 }
916 }
917 }
918 break;
919
920 case (int) R_MICROBLAZE_32_SYM_OP_SYM:
921 break; /* Do nothing. */
922
923 case (int) R_MICROBLAZE_GOTPC_64:
924 relocation = htab->sgotplt->output_section->vma
925 + htab->sgotplt->output_offset;
926 relocation -= (input_section->output_section->vma
927 + input_section->output_offset
928 + offset + INST_WORD_SIZE);
929 relocation += addend;
930 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
931 contents + offset + 2);
932 bfd_put_16 (input_bfd, relocation & 0xffff,
933 contents + offset + 2 + INST_WORD_SIZE);
934 break;
935
936 case (int) R_MICROBLAZE_PLT_64:
937 {
938 bfd_vma immediate;
939 if (htab->splt != NULL && h != NULL
940 && h->plt.offset != (bfd_vma) -1)
941 {
942 relocation = (htab->splt->output_section->vma
943 + htab->splt->output_offset
944 + h->plt.offset);
945 unresolved_reloc = FALSE;
946 immediate = relocation - (input_section->output_section->vma
947 + input_section->output_offset
948 + offset + INST_WORD_SIZE);
949 bfd_put_16 (input_bfd, (immediate >> 16) & 0xffff,
950 contents + offset + 2);
951 bfd_put_16 (input_bfd, immediate & 0xffff,
952 contents + offset + 2 + INST_WORD_SIZE);
953 }
954 else
955 {
956 relocation -= (input_section->output_section->vma
957 + input_section->output_offset
958 + offset + INST_WORD_SIZE);
959 immediate = relocation;
960 bfd_put_16 (input_bfd, (immediate >> 16) & 0xffff,
961 contents + offset + 2);
962 bfd_put_16 (input_bfd, immediate & 0xffff,
963 contents + offset + 2 + INST_WORD_SIZE);
964 }
965 break;
966 }
967
968 case (int) R_MICROBLAZE_GOT_64:
969 {
970 if (htab->sgot == NULL)
971 abort ();
972 if (h == NULL)
973 {
974 bfd_vma off;
975 if (local_got_offsets == NULL)
976 abort ();
977 off = local_got_offsets[r_symndx];
978 /* The LSB indicates whether we've already
979 created relocation. */
980 if (off & 1)
981 off &= ~1;
982 else
983 {
984 bfd_put_32 (output_bfd, relocation + addend,
985 htab->sgot->contents + off);
986
987 if (info->shared)
988 {
989 Elf_Internal_Rela outrel;
990 bfd_byte *loc;
991 if (htab->srelgot == NULL)
992 abort ();
993 outrel.r_offset = (htab->sgot->output_section->vma
994 + htab->sgot->output_offset
995 + off);
996 outrel.r_info = ELF32_R_INFO (0, R_MICROBLAZE_REL);
997 outrel.r_addend = relocation + addend;
998 loc = htab->srelgot->contents;
999 loc += htab->srelgot->reloc_count++
1000 * sizeof (Elf32_External_Rela);
1001 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1002 }
1003 local_got_offsets[r_symndx] |= 1;
1004 }
1005 relocation = htab->sgot->output_section->vma
1006 + htab->sgot->output_offset + off
1007 - htab->sgotplt->output_section->vma
1008 - htab->sgotplt->output_offset;
1009 unresolved_reloc = FALSE;
1010 }
1011 else
1012 {
1013 if (htab->sgotplt != NULL && h != NULL
1014 && h->got.offset != (bfd_vma) -1)
1015 {
1016 bfd_put_32 (output_bfd, relocation + addend,
1017 htab->sgot->contents + h->got.offset);
1018 relocation = htab->sgot->output_section->vma
1019 + htab->sgot->output_offset
1020 + h->got.offset
1021 - htab->sgotplt->output_section->vma
1022 - htab->sgotplt->output_offset;
1023 unresolved_reloc = FALSE;
1024 }
1025 else
1026 abort (); /* ??? */
1027 }
1028 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1029 contents + offset + 2);
1030 bfd_put_16 (input_bfd, relocation & 0xffff,
1031 contents + offset + 2 + INST_WORD_SIZE);
1032 break;
1033 }
1034
1035 case (int) R_MICROBLAZE_GOTOFF_64:
1036 {
1037 bfd_vma immediate;
1038 unsigned short lo, high;
1039 relocation += addend;
1040 relocation -= htab->sgotplt->output_section->vma
1041 + htab->sgotplt->output_offset;
1042 /* Write this value into correct location. */
1043 immediate = relocation;
1044 lo = immediate & 0x0000ffff;
1045 high = (immediate >> 16) & 0x0000ffff;
1046 bfd_put_16 (input_bfd, high, contents + offset + 2);
1047 bfd_put_16 (input_bfd, lo, contents + offset + INST_WORD_SIZE + 2);
1048 break;
1049 }
1050
1051 case (int) R_MICROBLAZE_GOTOFF_32:
1052 {
1053 relocation += addend;
1054 relocation -= htab->sgotplt->output_section->vma
1055 + htab->sgotplt->output_offset;
1056 /* Write this value into correct location. */
1057 bfd_put_32 (input_bfd, relocation, contents + offset);
1058 break;
1059 }
1060
1061 case (int) R_MICROBLAZE_64_PCREL :
1062 case (int) R_MICROBLAZE_64:
1063 case (int) R_MICROBLAZE_32:
1064 {
1065 /* r_symndx will be zero only for relocs against symbols
1066 from removed linkonce sections, or sections discarded by
1067 a linker script. */
1068 if (r_symndx == 0 || (input_section->flags & SEC_ALLOC) == 0)
1069 {
1070 relocation += addend;
1071 if (r_type == R_MICROBLAZE_32)
1072 bfd_put_32 (input_bfd, relocation, contents + offset);
1073 else
1074 {
1075 if (r_type == R_MICROBLAZE_64_PCREL)
1076 relocation -= (input_section->output_section->vma
1077 + input_section->output_offset
1078 + offset + INST_WORD_SIZE);
1079 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1080 contents + offset + 2);
1081 bfd_put_16 (input_bfd, relocation & 0xffff,
1082 contents + offset + 2 + INST_WORD_SIZE);
1083 }
1084 break;
1085 }
1086
1087 if ((info->shared
1088 && (h == NULL
1089 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1090 || h->root.type != bfd_link_hash_undefweak)
1091 && (!howto->pc_relative
1092 || (h != NULL
1093 && h->dynindx != -1
1094 && (!info->symbolic
1095 || !h->def_regular))))
1096 || (!info->shared
1097 && h != NULL
1098 && h->dynindx != -1
1099 && !h->non_got_ref
1100 && ((h->def_dynamic
1101 && !h->def_regular)
1102 || h->root.type == bfd_link_hash_undefweak
1103 || h->root.type == bfd_link_hash_undefined)))
1104 {
1105 Elf_Internal_Rela outrel;
1106 bfd_byte *loc;
1107 bfd_boolean skip, relocate = FALSE;
1108
1109 /* When generating a shared object, these relocations
1110 are copied into the output file to be resolved at run
1111 time. */
1112
1113 BFD_ASSERT (sreloc != NULL);
1114
1115 skip = FALSE;
1116
1117 outrel.r_offset =
1118 _bfd_elf_section_offset (output_bfd, info, input_section,
1119 rel->r_offset);
1120 if (outrel.r_offset == (bfd_vma) -1)
1121 skip = TRUE;
1122 else if (outrel.r_offset == (bfd_vma) -2)
1123 skip = TRUE, relocate = TRUE;
1124 outrel.r_offset += (input_section->output_section->vma
1125 + input_section->output_offset);
1126
1127 if (skip)
1128 memset (&outrel, 0, sizeof outrel);
1129 /* h->dynindx may be -1 if the symbol was marked to
1130 become local. */
1131 else if (h != NULL
1132 && ((! info->symbolic && h->dynindx != -1)
1133 || !h->def_regular))
1134 {
1135 BFD_ASSERT (h->dynindx != -1);
1136 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1137 outrel.r_addend = addend;
1138 }
1139 else
1140 {
1141 if (r_type == R_MICROBLAZE_32)
1142 {
1143 outrel.r_info = ELF32_R_INFO (0, R_MICROBLAZE_REL);
1144 outrel.r_addend = relocation + addend;
1145 }
1146 else
1147 {
1148 BFD_FAIL ();
1149 (*_bfd_error_handler)
1150 (_("%B: probably compiled without -fPIC?"),
1151 input_bfd);
1152 bfd_set_error (bfd_error_bad_value);
1153 return FALSE;
1154 }
1155 }
1156
1157 loc = sreloc->contents;
1158 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1159 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1160 break;
1161 }
1162 else
1163 {
1164 relocation += addend;
1165 if (r_type == R_MICROBLAZE_32)
1166 bfd_put_32 (input_bfd, relocation, contents + offset);
1167 else
1168 {
1169 if (r_type == R_MICROBLAZE_64_PCREL)
1170 relocation -= (input_section->output_section->vma
1171 + input_section->output_offset
1172 + offset + INST_WORD_SIZE);
1173 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1174 contents + offset + 2);
1175 bfd_put_16 (input_bfd, relocation & 0xffff,
1176 contents + offset + 2 + INST_WORD_SIZE);
1177 }
1178 break;
1179 }
1180 }
1181
1182 default :
1183 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1184 contents, offset,
1185 relocation, addend);
1186 break;
1187 }
1188 }
1189
1190 check_reloc:
1191
1192 if (r != bfd_reloc_ok)
1193 {
1194 /* FIXME: This should be generic enough to go in a utility. */
1195 const char *name;
1196
1197 if (h != NULL)
1198 name = h->root.root.string;
1199 else
1200 {
1201 name = (bfd_elf_string_from_elf_section
1202 (input_bfd, symtab_hdr->sh_link, sym->st_name));
1203 if (name == NULL || *name == '\0')
1204 name = bfd_section_name (input_bfd, sec);
1205 }
1206
1207 if (errmsg != NULL)
1208 goto common_error;
1209
1210 switch (r)
1211 {
1212 case bfd_reloc_overflow:
1213 if (!((*info->callbacks->reloc_overflow)
1214 (info, (h ? &h->root : NULL), name, howto->name,
1215 (bfd_vma) 0, input_bfd, input_section, offset)))
1216 return FALSE;
1217 break;
1218
1219 case bfd_reloc_undefined:
1220 if (!((*info->callbacks->undefined_symbol)
1221 (info, name, input_bfd, input_section, offset, TRUE)))
1222 return FALSE;
1223 break;
1224
1225 case bfd_reloc_outofrange:
1226 errmsg = _("internal error: out of range error");
1227 goto common_error;
1228
1229 case bfd_reloc_notsupported:
1230 errmsg = _("internal error: unsupported relocation error");
1231 goto common_error;
1232
1233 case bfd_reloc_dangerous:
1234 errmsg = _("internal error: dangerous error");
1235 goto common_error;
1236
1237 default:
1238 errmsg = _("internal error: unknown error");
1239 /* Fall through. */
1240 common_error:
1241 if (!((*info->callbacks->warning)
1242 (info, errmsg, name, input_bfd, input_section, offset)))
1243 return FALSE;
1244 break;
1245 }
1246 }
1247 }
1248
1249 return ret;
1250 }
1251 \f
1252 /* Calculate fixup value for reference. */
1253
1254 static int
1255 calc_fixup (bfd_vma addr, asection *sec)
1256 {
1257 int i, fixup = 0;
1258
1259 if (sec == NULL || sec->relax == NULL)
1260 return 0;
1261
1262 /* Look for addr in relax table, total fixup value. */
1263 for (i = 0; i < sec->relax_count; i++)
1264 {
1265 if (addr <= sec->relax[i].addr)
1266 break;
1267 fixup += sec->relax[i].size;
1268 }
1269
1270 return fixup;
1271 }
1272
1273 static bfd_boolean
1274 microblaze_elf_relax_section (bfd *abfd,
1275 asection *sec,
1276 struct bfd_link_info *link_info,
1277 bfd_boolean *again)
1278 {
1279 Elf_Internal_Shdr *symtab_hdr;
1280 Elf_Internal_Rela *internal_relocs;
1281 Elf_Internal_Rela *free_relocs = NULL;
1282 Elf_Internal_Rela *irel, *irelend;
1283 bfd_byte *contents = NULL;
1284 bfd_byte *free_contents = NULL;
1285 int rel_count;
1286 unsigned int shndx;
1287 int i, sym_index;
1288 asection *o;
1289 struct elf_link_hash_entry *sym_hash;
1290 Elf_Internal_Sym *isymbuf, *isymend;
1291 Elf_Internal_Sym *isym;
1292 int symcount;
1293 int offset;
1294 bfd_vma src, dest;
1295
1296 /* We only do this once per section. We may be able to delete some code
1297 by running multiple passes, but it is not worth it. */
1298 *again = FALSE;
1299
1300 /* Only do this for a text section. */
1301 if (link_info->relocatable
1302 || (sec->flags & SEC_RELOC) == 0
1303 || (sec->reloc_count == 0))
1304 return TRUE;
1305
1306 BFD_ASSERT ((sec->size > 0) || (sec->rawsize > 0));
1307
1308 /* If this is the first time we have been called for this section,
1309 initialize the cooked size. */
1310 if (sec->size == 0)
1311 sec->size = sec->rawsize;
1312
1313 /* Get symbols for this section. */
1314 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1315 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1316 symcount = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
1317 if (isymbuf == NULL)
1318 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, symcount,
1319 0, NULL, NULL, NULL);
1320 BFD_ASSERT (isymbuf != NULL);
1321
1322 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory);
1323 if (internal_relocs == NULL)
1324 goto error_return;
1325 if (! link_info->keep_memory)
1326 free_relocs = internal_relocs;
1327
1328 sec->relax = (struct relax_table *) bfd_malloc ((sec->reloc_count + 1)
1329 * sizeof (struct relax_table));
1330 if (sec->relax == NULL)
1331 goto error_return;
1332 sec->relax_count = 0;
1333
1334 irelend = internal_relocs + sec->reloc_count;
1335 rel_count = 0;
1336 for (irel = internal_relocs; irel < irelend; irel++, rel_count++)
1337 {
1338 bfd_vma symval;
1339 if ((ELF32_R_TYPE (irel->r_info) != (int) R_MICROBLAZE_64_PCREL)
1340 && (ELF32_R_TYPE (irel->r_info) != (int) R_MICROBLAZE_64 ))
1341 continue; /* Can't delete this reloc. */
1342
1343 /* Get the section contents. */
1344 if (contents == NULL)
1345 {
1346 if (elf_section_data (sec)->this_hdr.contents != NULL)
1347 contents = elf_section_data (sec)->this_hdr.contents;
1348 else
1349 {
1350 contents = (bfd_byte *) bfd_malloc (sec->size);
1351 if (contents == NULL)
1352 goto error_return;
1353 free_contents = contents;
1354
1355 if (!bfd_get_section_contents (abfd, sec, contents,
1356 (file_ptr) 0, sec->size))
1357 goto error_return;
1358 elf_section_data (sec)->this_hdr.contents = contents;
1359 }
1360 }
1361
1362 /* Get the value of the symbol referred to by the reloc. */
1363 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
1364 {
1365 /* A local symbol. */
1366 asection *sym_sec;
1367
1368 isym = isymbuf + ELF32_R_SYM (irel->r_info);
1369 if (isym->st_shndx == SHN_UNDEF)
1370 sym_sec = bfd_und_section_ptr;
1371 else if (isym->st_shndx == SHN_ABS)
1372 sym_sec = bfd_abs_section_ptr;
1373 else if (isym->st_shndx == SHN_COMMON)
1374 sym_sec = bfd_com_section_ptr;
1375 else
1376 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1377
1378 symval = _bfd_elf_rela_local_sym (abfd, isym, &sym_sec, irel);
1379 }
1380 else
1381 {
1382 unsigned long indx;
1383 struct elf_link_hash_entry *h;
1384
1385 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
1386 h = elf_sym_hashes (abfd)[indx];
1387 BFD_ASSERT (h != NULL);
1388
1389 if (h->root.type != bfd_link_hash_defined
1390 && h->root.type != bfd_link_hash_defweak)
1391 /* This appears to be a reference to an undefined
1392 symbol. Just ignore it--it will be caught by the
1393 regular reloc processing. */
1394 continue;
1395
1396 symval = (h->root.u.def.value
1397 + h->root.u.def.section->output_section->vma
1398 + h->root.u.def.section->output_offset);
1399 }
1400
1401 /* If this is a PC-relative reloc, subtract the instr offset from
1402 the symbol value. */
1403 if (ELF32_R_TYPE (irel->r_info) == (int) R_MICROBLAZE_64_PCREL)
1404 {
1405 symval = symval + irel->r_addend
1406 - (irel->r_offset
1407 + sec->output_section->vma
1408 + sec->output_offset);
1409 }
1410 else
1411 symval += irel->r_addend;
1412
1413 if ((symval & 0xffff8000) == 0
1414 || (symval & 0xffff8000) == 0xffff8000)
1415 {
1416 /* We can delete this instruction. */
1417 sec->relax[sec->relax_count].addr = irel->r_offset;
1418 sec->relax[sec->relax_count].size = INST_WORD_SIZE;
1419 sec->relax_count++;
1420
1421 /* Rewrite relocation type. */
1422 switch ((enum elf_microblaze_reloc_type) ELF32_R_TYPE (irel->r_info))
1423 {
1424 case R_MICROBLAZE_64_PCREL:
1425 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1426 (int) R_MICROBLAZE_32_PCREL_LO);
1427 break;
1428 case R_MICROBLAZE_64:
1429 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1430 (int) R_MICROBLAZE_32_LO);
1431 break;
1432 default:
1433 /* Cannot happen. */
1434 BFD_ASSERT (FALSE);
1435 }
1436 }
1437 } /* Loop through all relocations. */
1438
1439 /* Loop through the relocs again, and see if anything needs to change. */
1440 if (sec->relax_count > 0)
1441 {
1442 shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1443 rel_count = 0;
1444 sec->relax[sec->relax_count].addr = sec->size;
1445
1446 for (irel = internal_relocs; irel < irelend; irel++, rel_count++)
1447 {
1448 bfd_vma nraddr;
1449
1450 /* Get the new reloc address. */
1451 nraddr = irel->r_offset - calc_fixup (irel->r_offset, sec);
1452 switch ((enum elf_microblaze_reloc_type) ELF32_R_TYPE (irel->r_info))
1453 {
1454 default:
1455 break;
1456 case R_MICROBLAZE_64_PCREL:
1457 break;
1458 case R_MICROBLAZE_64:
1459 case R_MICROBLAZE_32_LO:
1460 /* If this reloc is against a symbol defined in this
1461 section, we must check the addend to see it will put the value in
1462 range to be adjusted, and hence must be changed. */
1463 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
1464 {
1465 isym = isymbuf + ELF32_R_SYM (irel->r_info);
1466 /* Only handle relocs against .text. */
1467 if (isym->st_shndx == shndx
1468 && ELF32_ST_TYPE (isym->st_info) == STT_SECTION)
1469 irel->r_addend -= calc_fixup (irel->r_addend, sec);
1470 }
1471 break;
1472 case R_MICROBLAZE_NONE:
1473 {
1474 /* This was a PC-relative instruction that was
1475 completely resolved. */
1476 int sfix, efix;
1477 bfd_vma target_address;
1478 target_address = irel->r_addend + irel->r_offset;
1479 sfix = calc_fixup (irel->r_offset, sec);
1480 efix = calc_fixup (target_address, sec);
1481 irel->r_addend -= (efix - sfix);
1482 /* Should use HOWTO. */
1483 bfd_put_16 (abfd, irel->r_addend, contents + irel->r_offset + 2);
1484 }
1485 break;
1486 case R_MICROBLAZE_64_NONE:
1487 {
1488 /* This was a PC-relative 64-bit instruction that was
1489 completely resolved. */
1490 int sfix, efix;
1491 bfd_vma target_address;
1492 target_address = irel->r_addend + irel->r_offset + INST_WORD_SIZE;
1493 sfix = calc_fixup (irel->r_offset + INST_WORD_SIZE, sec);
1494 efix = calc_fixup (target_address, sec);
1495 irel->r_addend -= (efix - sfix);
1496 bfd_put_16 (abfd, irel->r_addend, contents + irel->r_offset
1497 + INST_WORD_SIZE + 2);
1498 }
1499 break;
1500 }
1501 irel->r_offset = nraddr;
1502 } /* Change all relocs in this section. */
1503
1504 /* Look through all other sections. */
1505 for (o = abfd->sections; o != NULL; o = o->next)
1506 {
1507 Elf_Internal_Rela *irelocs;
1508 Elf_Internal_Rela *irelscan, *irelscanend;
1509 bfd_byte *ocontents;
1510
1511 if (o == sec
1512 || (o->flags & SEC_RELOC) == 0
1513 || o->reloc_count == 0)
1514 continue;
1515
1516 /* We always cache the relocs. Perhaps, if info->keep_memory is
1517 FALSE, we should free them, if we are permitted to. */
1518
1519 irelocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL, TRUE);
1520 if (irelocs == NULL)
1521 goto error_return;
1522
1523 ocontents = NULL;
1524 irelscanend = irelocs + o->reloc_count;
1525 for (irelscan = irelocs; irelscan < irelscanend; irelscan++)
1526 {
1527 if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32)
1528 {
1529 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1530
1531 /* Look at the reloc only if the value has been resolved. */
1532 if (isym->st_shndx == shndx
1533 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
1534 {
1535 if (ocontents == NULL)
1536 {
1537 if (elf_section_data (o)->this_hdr.contents != NULL)
1538 ocontents = elf_section_data (o)->this_hdr.contents;
1539 else
1540 {
1541 /* We always cache the section contents.
1542 Perhaps, if info->keep_memory is FALSE, we
1543 should free them, if we are permitted to. */
1544 if (o->rawsize == 0)
1545 o->rawsize = o->size;
1546 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1547 if (ocontents == NULL)
1548 goto error_return;
1549 if (!bfd_get_section_contents (abfd, o, ocontents,
1550 (file_ptr) 0,
1551 o->rawsize))
1552 goto error_return;
1553 elf_section_data (o)->this_hdr.contents = ocontents;
1554 }
1555
1556 }
1557 irelscan->r_addend -= calc_fixup (irelscan->r_addend, sec);
1558 }
1559 else if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_SYM_OP_SYM)
1560 {
1561 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1562
1563 /* Look at the reloc only if the value has been resolved. */
1564 if (ocontents == NULL)
1565 {
1566 if (elf_section_data (o)->this_hdr.contents != NULL)
1567 ocontents = elf_section_data (o)->this_hdr.contents;
1568 else
1569 {
1570 /* We always cache the section contents.
1571 Perhaps, if info->keep_memory is FALSE, we
1572 should free them, if we are permitted to. */
1573
1574 if (o->rawsize == 0)
1575 o->rawsize = o->size;
1576 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1577 if (ocontents == NULL)
1578 goto error_return;
1579 if (!bfd_get_section_contents (abfd, o, ocontents,
1580 (file_ptr) 0,
1581 o->rawsize))
1582 goto error_return;
1583 elf_section_data (o)->this_hdr.contents = ocontents;
1584 }
1585 }
1586 irelscan->r_addend -= calc_fixup (irel->r_addend
1587 + isym->st_value,
1588 sec);
1589 }
1590 }
1591 else if ((ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_PCREL_LO)
1592 || (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_LO))
1593 {
1594 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1595
1596 /* Look at the reloc only if the value has been resolved. */
1597 if (isym->st_shndx == shndx
1598 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
1599 {
1600 bfd_vma immediate;
1601 bfd_vma target_address;
1602
1603 if (ocontents == NULL)
1604 {
1605 if (elf_section_data (o)->this_hdr.contents != NULL)
1606 ocontents = elf_section_data (o)->this_hdr.contents;
1607 else
1608 {
1609 /* We always cache the section contents.
1610 Perhaps, if info->keep_memory is FALSE, we
1611 should free them, if we are permitted to. */
1612 if (o->rawsize == 0)
1613 o->rawsize = o->size;
1614 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1615 if (ocontents == NULL)
1616 goto error_return;
1617 if (!bfd_get_section_contents (abfd, o, ocontents,
1618 (file_ptr) 0,
1619 o->rawsize))
1620 goto error_return;
1621 elf_section_data (o)->this_hdr.contents = ocontents;
1622 }
1623 }
1624
1625 immediate = (unsigned short) bfd_get_16 (abfd, ocontents +
1626 irelscan->r_offset + 2);
1627 target_address = immediate;
1628 offset = calc_fixup (target_address, sec);
1629 immediate -= offset;
1630 irelscan->r_addend -= offset;
1631 bfd_put_16 (abfd, immediate, ocontents + irelscan->r_offset + 2);
1632 }
1633 }
1634
1635 if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_64)
1636 {
1637 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1638
1639 /* Look at the reloc only if the value has been resolved. */
1640 if (isym->st_shndx == shndx
1641 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
1642 {
1643 bfd_vma immediate;
1644
1645 if (ocontents == NULL)
1646 {
1647 if (elf_section_data (o)->this_hdr.contents != NULL)
1648 ocontents = elf_section_data (o)->this_hdr.contents;
1649 else
1650 {
1651 /* We always cache the section contents.
1652 Perhaps, if info->keep_memory is FALSE, we
1653 should free them, if we are permitted to. */
1654
1655 if (o->rawsize == 0)
1656 o->rawsize = o->size;
1657 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1658 if (ocontents == NULL)
1659 goto error_return;
1660 if (!bfd_get_section_contents (abfd, o, ocontents,
1661 (file_ptr) 0,
1662 o->rawsize))
1663 goto error_return;
1664 elf_section_data (o)->this_hdr.contents = ocontents;
1665 }
1666 }
1667 immediate = (unsigned short) (bfd_get_16 (abfd, ocontents
1668 + irelscan->r_offset
1669 + 2) << 16)
1670 & 0xffff0000;
1671 immediate += (unsigned short) (bfd_get_16 (abfd, ocontents
1672 + irelscan->r_offset
1673 + INST_WORD_SIZE + 2))
1674 & 0x0000ffff;
1675
1676 offset = calc_fixup (irelscan->r_addend, sec);
1677 immediate -= offset;
1678 irelscan->r_addend -= offset;
1679 }
1680 }
1681 else if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_64_PCREL)
1682 {
1683 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1684
1685 /* Look at the reloc only if the value has been resolved. */
1686 if (isym->st_shndx == shndx
1687 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
1688 {
1689 bfd_vma immediate;
1690 bfd_vma target_address;
1691
1692 if (ocontents == NULL)
1693 {
1694 if (elf_section_data (o)->this_hdr.contents != NULL)
1695 ocontents = elf_section_data (o)->this_hdr.contents;
1696 else
1697 {
1698 /* We always cache the section contents.
1699 Perhaps, if info->keep_memory is FALSE, we
1700 should free them, if we are permitted to. */
1701 if (o->rawsize == 0)
1702 o->rawsize = o->size;
1703 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1704 if (ocontents == NULL)
1705 goto error_return;
1706 if (!bfd_get_section_contents (abfd, o, ocontents,
1707 (file_ptr) 0,
1708 o->rawsize))
1709 goto error_return;
1710 elf_section_data (o)->this_hdr.contents = ocontents;
1711 }
1712 }
1713
1714 immediate = (unsigned short)
1715 (bfd_get_16 (abfd, ocontents + irelscan->r_offset + 2) << 16)
1716 & 0xffff0000;
1717 immediate += (unsigned short)
1718 (bfd_get_16 (abfd, ocontents + irelscan->r_offset
1719 + INST_WORD_SIZE + 2))
1720 & 0x0000ffff;
1721 target_address = immediate;
1722 offset = calc_fixup (target_address, sec);
1723 immediate -= offset;
1724 irelscan->r_addend -= offset;
1725 bfd_put_16 (abfd, ((immediate >> 16) & 0x0000ffff),
1726 ocontents + irelscan->r_offset + 2);
1727 bfd_put_16 (abfd, (immediate & 0x0000ffff),
1728 ocontents + irelscan->r_offset + INST_WORD_SIZE + 2);
1729 }
1730 }
1731 }
1732 }
1733
1734 /* Adjust the local symbols defined in this section. */
1735 isymend = isymbuf + symtab_hdr->sh_info;
1736 for (isym = isymbuf; isym < isymend; isym++)
1737 {
1738 if (isym->st_shndx == shndx)
1739 isym->st_value =- calc_fixup (isym->st_value, sec);
1740 }
1741
1742 /* Now adjust the global symbols defined in this section. */
1743 isym = isymbuf + symtab_hdr->sh_info;
1744 isymend = isymbuf + (symtab_hdr->sh_size / sizeof (Elf32_External_Sym));
1745 for (sym_index = 0; isym < isymend; isym++, sym_index++)
1746 {
1747 sym_hash = elf_sym_hashes (abfd)[sym_index];
1748 if (isym->st_shndx == shndx
1749 && (sym_hash->root.type == bfd_link_hash_defined
1750 || sym_hash->root.type == bfd_link_hash_defweak)
1751 && sym_hash->root.u.def.section == sec)
1752 {
1753 sym_hash->root.u.def.value -= calc_fixup (sym_hash->root.u.def.value,
1754 sec);
1755 }
1756 }
1757
1758 /* Physically move the code and change the cooked size. */
1759 dest = sec->relax[0].addr;
1760 for (i = 0; i < sec->relax_count; i++)
1761 {
1762 int len;
1763 src = sec->relax[i].addr + sec->relax[i].size;
1764 len = sec->relax[i+1].addr - sec->relax[i].addr - sec->relax[i].size;
1765
1766 memmove (contents + dest, contents + src, len);
1767 sec->size -= sec->relax[i].size;
1768 dest += len;
1769 }
1770
1771 elf_section_data (sec)->relocs = internal_relocs;
1772 free_relocs = NULL;
1773
1774 elf_section_data (sec)->this_hdr.contents = contents;
1775 free_contents = NULL;
1776
1777 symtab_hdr->contents = (bfd_byte *) isymbuf;
1778 }
1779
1780 if (free_relocs != NULL)
1781 {
1782 free (free_relocs);
1783 free_relocs = NULL;
1784 }
1785
1786 if (free_contents != NULL)
1787 {
1788 if (!link_info->keep_memory)
1789 free (free_contents);
1790 else
1791 /* Cache the section contents for elf_link_input_bfd. */
1792 elf_section_data (sec)->this_hdr.contents = contents;
1793 free_contents = NULL;
1794 }
1795
1796 if (sec->relax_count == 0)
1797 {
1798 free (sec->relax);
1799 sec->relax = NULL;
1800 }
1801 return TRUE;
1802
1803 error_return:
1804 if (free_relocs != NULL)
1805 free (free_relocs);
1806 if (free_contents != NULL)
1807 free (free_contents);
1808 if (sec->relax != NULL)
1809 {
1810 free (sec->relax);
1811 sec->relax = NULL;
1812 sec->relax_count = 0;
1813 }
1814 return FALSE;
1815 }
1816
1817 /* Return the section that should be marked against GC for a given
1818 relocation. */
1819
1820 static asection *
1821 microblaze_elf_gc_mark_hook (asection *sec,
1822 struct bfd_link_info * info ATTRIBUTE_UNUSED,
1823 Elf_Internal_Rela * rel,
1824 struct elf_link_hash_entry * h,
1825 Elf_Internal_Sym * sym)
1826 {
1827 if (h != NULL)
1828 {
1829 switch (ELF32_R_TYPE (rel->r_info))
1830 {
1831 case R_MICROBLAZE_GNU_VTINHERIT:
1832 case R_MICROBLAZE_GNU_VTENTRY:
1833 break;
1834
1835 default:
1836 switch (h->root.type)
1837 {
1838 case bfd_link_hash_defined:
1839 case bfd_link_hash_defweak:
1840 return h->root.u.def.section;
1841
1842 case bfd_link_hash_common:
1843 return h->root.u.c.p->section;
1844
1845 default:
1846 break;
1847 }
1848 }
1849 }
1850 else
1851 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1852
1853 return NULL;
1854 }
1855
1856 /* Update the got entry reference counts for the section being removed. */
1857
1858 static bfd_boolean
1859 microblaze_elf_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
1860 struct bfd_link_info * info ATTRIBUTE_UNUSED,
1861 asection * sec ATTRIBUTE_UNUSED,
1862 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
1863 {
1864 return TRUE;
1865 }
1866
1867 /* PIC support. */
1868
1869 #define PLT_ENTRY_SIZE 16
1870
1871 #define PLT_ENTRY_WORD_0 0xb0000000 /* "imm 0". */
1872 #define PLT_ENTRY_WORD_1 0xe9940000 /* "lwi r12,r20,0" - relocated to lwi r12,r20,func@GOT. */
1873 #define PLT_ENTRY_WORD_1_NOPIC 0xe9800000 /* "lwi r12,r0,0" - non-PIC object. */
1874 #define PLT_ENTRY_WORD_2 0x98186000 /* "brad r12". */
1875 #define PLT_ENTRY_WORD_3 0x80000000 /* "nop". */
1876
1877 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
1878 shortcuts to them in our hash table. */
1879
1880 static bfd_boolean
1881 create_got_section (bfd *dynobj, struct bfd_link_info *info)
1882 {
1883 struct elf32_mb_link_hash_table *htab;
1884
1885 if (! _bfd_elf_create_got_section (dynobj, info))
1886 return FALSE;
1887 htab = elf32_mb_hash_table (info);
1888 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1889 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1890 if (!htab->sgot || !htab->sgotplt)
1891 return FALSE;
1892
1893 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
1894 if (htab->srelgot == NULL
1895 || ! bfd_set_section_flags (dynobj, htab->srelgot, SEC_ALLOC
1896 | SEC_LOAD
1897 | SEC_HAS_CONTENTS
1898 | SEC_IN_MEMORY
1899 | SEC_LINKER_CREATED
1900 | SEC_READONLY)
1901 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1902 return FALSE;
1903 return TRUE;
1904 }
1905
1906 /* Look through the relocs for a section during the first phase. */
1907
1908 static bfd_boolean
1909 microblaze_elf_check_relocs (bfd * abfd,
1910 struct bfd_link_info * info,
1911 asection * sec,
1912 const Elf_Internal_Rela * relocs)
1913 {
1914 Elf_Internal_Shdr * symtab_hdr;
1915 struct elf_link_hash_entry ** sym_hashes;
1916 struct elf_link_hash_entry ** sym_hashes_end;
1917 const Elf_Internal_Rela * rel;
1918 const Elf_Internal_Rela * rel_end;
1919 struct elf32_mb_link_hash_table *htab;
1920 bfd_vma *local_got_offsets;
1921 asection *sreloc = NULL;
1922
1923 if (info->relocatable)
1924 return TRUE;
1925
1926 htab = elf32_mb_hash_table (info);
1927 local_got_offsets = elf_local_got_offsets (abfd);
1928 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
1929 sym_hashes = elf_sym_hashes (abfd);
1930 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
1931 if (!elf_bad_symtab (abfd))
1932 sym_hashes_end -= symtab_hdr->sh_info;
1933
1934 rel_end = relocs + sec->reloc_count;
1935
1936 for (rel = relocs; rel < rel_end; rel++)
1937 {
1938 unsigned int r_type;
1939 struct elf_link_hash_entry * h;
1940 unsigned long r_symndx;
1941
1942 r_symndx = ELF32_R_SYM (rel->r_info);
1943 r_type = ELF32_R_TYPE (rel->r_info);
1944
1945 if (r_symndx < symtab_hdr->sh_info)
1946 h = NULL;
1947 else
1948 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
1949
1950 switch (r_type)
1951 {
1952 /* This relocation describes the C++ object vtable hierarchy.
1953 Reconstruct it for later use during GC. */
1954 case R_MICROBLAZE_GNU_VTINHERIT:
1955 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1956 return FALSE;
1957 break;
1958
1959 /* This relocation describes which C++ vtable entries are actually
1960 used. Record for later use during GC. */
1961 case R_MICROBLAZE_GNU_VTENTRY:
1962 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1963 return FALSE;
1964 break;
1965
1966 /* This relocation requires .plt entry. */
1967 case R_MICROBLAZE_PLT_64:
1968 if (h != NULL)
1969 {
1970 h->needs_plt = 1;
1971 h->plt.refcount += 1;
1972 }
1973 break;
1974
1975 /* This relocation requires .got entry. */
1976 case R_MICROBLAZE_GOT_64:
1977 if (htab->sgot == NULL)
1978 {
1979 if (htab->elf.dynobj == NULL)
1980 htab->elf.dynobj = abfd;
1981 if (!create_got_section (htab->elf.dynobj, info))
1982 return FALSE;
1983 }
1984 if (h != NULL)
1985 {
1986 h->got.refcount += 1;
1987 }
1988 else
1989 {
1990 bfd_signed_vma *local_got_refcounts;
1991
1992 /* This is a global offset table entry for a local symbol. */
1993 local_got_refcounts = elf_local_got_refcounts (abfd);
1994 if (local_got_refcounts == NULL)
1995 {
1996 bfd_size_type size;
1997
1998 size = symtab_hdr->sh_info;
1999 size *= sizeof (bfd_signed_vma);
2000 local_got_refcounts = bfd_zalloc (abfd, size);
2001 if (local_got_refcounts == NULL)
2002 return FALSE;
2003 elf_local_got_refcounts (abfd) = local_got_refcounts;
2004 }
2005 local_got_refcounts[r_symndx] += 1;
2006 }
2007 break;
2008
2009 case R_MICROBLAZE_64:
2010 case R_MICROBLAZE_64_PCREL:
2011 case R_MICROBLAZE_32:
2012 {
2013 if (h != NULL && !info->shared)
2014 {
2015 /* we may need a copy reloc. */
2016 h->non_got_ref = 1;
2017
2018 /* we may also need a .plt entry. */
2019 h->plt.refcount += 1;
2020 if (ELF32_R_TYPE (rel->r_info) != R_MICROBLAZE_64_PCREL)
2021 h->pointer_equality_needed = 1;
2022 }
2023
2024
2025 /* If we are creating a shared library, and this is a reloc
2026 against a global symbol, or a non PC relative reloc
2027 against a local symbol, then we need to copy the reloc
2028 into the shared library. However, if we are linking with
2029 -Bsymbolic, we do not need to copy a reloc against a
2030 global symbol which is defined in an object we are
2031 including in the link (i.e., DEF_REGULAR is set). At
2032 this point we have not seen all the input files, so it is
2033 possible that DEF_REGULAR is not set now but will be set
2034 later (it is never cleared). In case of a weak definition,
2035 DEF_REGULAR may be cleared later by a strong definition in
2036 a shared library. We account for that possibility below by
2037 storing information in the relocs_copied field of the hash
2038 table entry. A similar situation occurs when creating
2039 shared libraries and symbol visibility changes render the
2040 symbol local.
2041
2042 If on the other hand, we are creating an executable, we
2043 may need to keep relocations for symbols satisfied by a
2044 dynamic library if we manage to avoid copy relocs for the
2045 symbol. */
2046
2047 if ((info->shared
2048 && (sec->flags & SEC_ALLOC) != 0
2049 && (r_type != R_MICROBLAZE_64_PCREL
2050 || (h != NULL
2051 && (! info->symbolic
2052 || h->root.type == bfd_link_hash_defweak
2053 || !h->def_regular))))
2054 || (!info->shared
2055 && (sec->flags & SEC_ALLOC) != 0
2056 && h != NULL
2057 && (h->root.type == bfd_link_hash_defweak
2058 || !h->def_regular)))
2059 {
2060 struct elf32_mb_dyn_relocs *p;
2061 struct elf32_mb_dyn_relocs **head;
2062
2063 /* When creating a shared object, we must copy these
2064 relocs into the output file. We create a reloc
2065 section in dynobj and make room for the reloc. */
2066
2067 if (sreloc == NULL)
2068 {
2069 const char *name;
2070 bfd *dynobj;
2071 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
2072 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
2073
2074 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
2075 if (name == NULL)
2076 return FALSE;
2077
2078 if (strncmp (name, ".rela", 5) != 0
2079 || strcmp (bfd_get_section_name (abfd, sec),
2080 name + 5) != 0)
2081 {
2082 (*_bfd_error_handler)
2083 (_("%B: bad relocation section name `%s\'"),
2084 abfd, name);
2085 }
2086
2087 if (htab->elf.dynobj == NULL)
2088 htab->elf.dynobj = abfd;
2089 dynobj = htab->elf.dynobj;
2090
2091 sreloc = bfd_get_section_by_name (dynobj, name);
2092 if (sreloc == NULL)
2093 {
2094 flagword flags;
2095
2096 sreloc = bfd_make_section (dynobj, name);
2097 flags = (SEC_HAS_CONTENTS | SEC_READONLY
2098 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2099 if ((sec->flags & SEC_ALLOC) != 0)
2100 flags |= SEC_ALLOC | SEC_LOAD;
2101 if (sreloc == NULL
2102 || ! bfd_set_section_flags (dynobj, sreloc, flags)
2103 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
2104 return FALSE;
2105 }
2106 elf_section_data (sec)->sreloc = sreloc;
2107 }
2108
2109 /* If this is a global symbol, we count the number of
2110 relocations we need for this symbol. */
2111 if (h != NULL)
2112 head = &((struct elf32_mb_link_hash_entry *) h)->dyn_relocs;
2113 else
2114 {
2115 /* Track dynamic relocs needed for local syms too.
2116 We really need local syms available to do this
2117 easily. Oh well. */
2118
2119 asection *s;
2120 Elf_Internal_Sym *isym;
2121 void *vpp;
2122
2123 isym = bfd_sym_from_r_symndx (&htab->sym_sec,
2124 abfd, r_symndx);
2125 if (isym == NULL)
2126 return FALSE;
2127
2128 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2129 if (s == NULL)
2130 return FALSE;
2131
2132 vpp = &elf_section_data (s)->local_dynrel;
2133 head = (struct elf32_mb_dyn_relocs **) vpp;
2134 }
2135
2136 p = *head;
2137 if (p == NULL || p->sec != sec)
2138 {
2139 bfd_size_type amt = sizeof *p;
2140 p = ((struct elf32_mb_dyn_relocs *)
2141 bfd_alloc (htab->elf.dynobj, amt));
2142 if (p == NULL)
2143 return FALSE;
2144 p->next = *head;
2145 *head = p;
2146 p->sec = sec;
2147 p->count = 0;
2148 p->pc_count = 0;
2149 }
2150
2151 p->count += 1;
2152 if (r_type == R_MICROBLAZE_64_PCREL)
2153 p->pc_count += 1;
2154 }
2155 }
2156 break;
2157 }
2158 }
2159
2160 return TRUE;
2161 }
2162
2163 static bfd_boolean
2164 microblaze_elf_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
2165 {
2166 struct elf32_mb_link_hash_table *htab;
2167
2168 htab = elf32_mb_hash_table (info);
2169 if (!htab->sgot && !create_got_section (dynobj, info))
2170 return FALSE;
2171
2172 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
2173 return FALSE;
2174
2175 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
2176 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2177 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
2178 if (!info->shared)
2179 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
2180
2181 if (!htab->splt || !htab->srelplt || !htab->sdynbss
2182 || (!info->shared && !htab->srelbss))
2183 abort ();
2184
2185 return TRUE;
2186 }
2187
2188 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2189
2190 static void
2191 microblaze_elf_copy_indirect_symbol (struct bfd_link_info *info,
2192 struct elf_link_hash_entry *dir,
2193 struct elf_link_hash_entry *ind)
2194 {
2195 struct elf32_mb_link_hash_entry *edir, *eind;
2196
2197 edir = (struct elf32_mb_link_hash_entry *) dir;
2198 eind = (struct elf32_mb_link_hash_entry *) ind;
2199
2200 if (eind->dyn_relocs != NULL)
2201 {
2202 if (edir->dyn_relocs != NULL)
2203 {
2204 struct elf32_mb_dyn_relocs **pp;
2205 struct elf32_mb_dyn_relocs *p;
2206
2207 if (ind->root.type == bfd_link_hash_indirect)
2208 abort ();
2209
2210 /* Add reloc counts against the weak sym to the strong sym
2211 list. Merge any entries against the same section. */
2212 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
2213 {
2214 struct elf32_mb_dyn_relocs *q;
2215
2216 for (q = edir->dyn_relocs; q != NULL; q = q->next)
2217 if (q->sec == p->sec)
2218 {
2219 q->pc_count += p->pc_count;
2220 q->count += p->count;
2221 *pp = p->next;
2222 break;
2223 }
2224 if (q == NULL)
2225 pp = &p->next;
2226 }
2227 *pp = edir->dyn_relocs;
2228 }
2229
2230 edir->dyn_relocs = eind->dyn_relocs;
2231 eind->dyn_relocs = NULL;
2232 }
2233
2234 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
2235 }
2236
2237 static bfd_boolean
2238 microblaze_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
2239 struct elf_link_hash_entry *h)
2240 {
2241 struct elf32_mb_link_hash_table *htab;
2242 struct elf32_mb_link_hash_entry * eh;
2243 struct elf32_mb_dyn_relocs *p;
2244 asection *sdynbss, *s;
2245 unsigned int power_of_two;
2246 bfd *dynobj;
2247
2248 htab = elf32_mb_hash_table (info);
2249
2250 /* If this is a function, put it in the procedure linkage table. We
2251 will fill in the contents of the procedure linkage table later,
2252 when we know the address of the .got section. */
2253 if (h->type == STT_FUNC
2254 || h->needs_plt)
2255 {
2256 if (h->plt.refcount <= 0
2257 || SYMBOL_CALLS_LOCAL (info, h)
2258 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2259 && h->root.type == bfd_link_hash_undefweak))
2260 {
2261 /* This case can occur if we saw a PLT reloc in an input
2262 file, but the symbol was never referred to by a dynamic
2263 object, or if all references were garbage collected. In
2264 such a case, we don't actually need to build a procedure
2265 linkage table, and we can just do a PC32 reloc instead. */
2266 h->plt.offset = (bfd_vma) -1;
2267 h->needs_plt = 0;
2268 }
2269
2270 return TRUE;
2271 }
2272 else
2273 /* It's possible that we incorrectly decided a .plt reloc was
2274 needed for an R_MICROBLAZE_64_PCREL reloc to a non-function sym in
2275 check_relocs. We can't decide accurately between function and
2276 non-function syms in check-relocs; Objects loaded later in
2277 the link may change h->type. So fix it now. */
2278 h->plt.offset = (bfd_vma) -1;
2279
2280 /* If this is a weak symbol, and there is a real definition, the
2281 processor independent code will have arranged for us to see the
2282 real definition first, and we can just use the same value. */
2283 if (h->u.weakdef != NULL)
2284 {
2285 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2286 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2287 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2288 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2289 return TRUE;
2290 }
2291
2292 /* This is a reference to a symbol defined by a dynamic object which
2293 is not a function. */
2294
2295 /* If we are creating a shared library, we must presume that the
2296 only references to the symbol are via the global offset table.
2297 For such cases we need not do anything here; the relocations will
2298 be handled correctly by relocate_section. */
2299 if (info->shared)
2300 return TRUE;
2301
2302 /* If there are no references to this symbol that do not use the
2303 GOT, we don't need to generate a copy reloc. */
2304 if (!h->non_got_ref)
2305 return TRUE;
2306
2307 /* If -z nocopyreloc was given, we won't generate them either. */
2308 if (info->nocopyreloc)
2309 {
2310 h->non_got_ref = 0;
2311 return TRUE;
2312 }
2313
2314 eh = (struct elf32_mb_link_hash_entry *) h;
2315 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2316 {
2317 s = p->sec->output_section;
2318 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2319 break;
2320 }
2321
2322 /* If we didn't find any dynamic relocs in read-only sections, then
2323 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2324 if (p == NULL)
2325 {
2326 h->non_got_ref = 0;
2327 return TRUE;
2328 }
2329
2330 /* We must allocate the symbol in our .dynbss section, which will
2331 become part of the .bss section of the executable. There will be
2332 an entry for this symbol in the .dynsym section. The dynamic
2333 object will contain position independent code, so all references
2334 from the dynamic object to this symbol will go through the global
2335 offset table. The dynamic linker will use the .dynsym entry to
2336 determine the address it must put in the global offset table, so
2337 both the dynamic object and the regular object will refer to the
2338 same memory location for the variable. */
2339
2340 /* We must generate a R_MICROBLAZE_COPY reloc to tell the dynamic linker
2341 to copy the initial value out of the dynamic object and into the
2342 runtime process image. */
2343 dynobj = elf_hash_table (info)->dynobj;
2344 BFD_ASSERT (dynobj != NULL);
2345 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2346 {
2347 htab->srelbss->size += sizeof (Elf32_External_Rela);
2348 h->needs_copy = 1;
2349 }
2350
2351 /* We need to figure out the alignment required for this symbol. I
2352 have no idea how ELF linkers handle this. */
2353 power_of_two = bfd_log2 (h->size);
2354 if (power_of_two > 3)
2355 power_of_two = 3;
2356
2357 sdynbss = htab->sdynbss;
2358 /* Apply the required alignment. */
2359 sdynbss->size = BFD_ALIGN (sdynbss->size, (bfd_size_type) (1 << power_of_two));
2360 if (power_of_two > bfd_get_section_alignment (dynobj, sdynbss))
2361 {
2362 if (! bfd_set_section_alignment (dynobj, sdynbss, power_of_two))
2363 return FALSE;
2364 }
2365
2366 /* Define the symbol as being at this point in the section. */
2367 h->root.u.def.section = sdynbss;
2368 h->root.u.def.value = sdynbss->size;
2369
2370 /* Increment the section size to make room for the symbol. */
2371 sdynbss->size += h->size;
2372 return TRUE;
2373 }
2374
2375 /* Allocate space in .plt, .got and associated reloc sections for
2376 dynamic relocs. */
2377
2378 static bfd_boolean
2379 allocate_dynrelocs (struct elf_link_hash_entry *h, void * dat)
2380 {
2381 struct bfd_link_info *info;
2382 struct elf32_mb_link_hash_table *htab;
2383 struct elf32_mb_link_hash_entry *eh;
2384 struct elf32_mb_dyn_relocs *p;
2385
2386 if (h->root.type == bfd_link_hash_indirect)
2387 return TRUE;
2388
2389 if (h->root.type == bfd_link_hash_warning)
2390 /* When warning symbols are created, they **replace** the "real"
2391 entry in the hash table, thus we never get to see the real
2392 symbol in a hash traversal. So look at it now. */
2393 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2394
2395 info = (struct bfd_link_info *) dat;
2396 htab = elf32_mb_hash_table (info);
2397
2398 if (htab->elf.dynamic_sections_created
2399 && h->plt.refcount > 0)
2400 {
2401 /* Make sure this symbol is output as a dynamic symbol.
2402 Undefined weak syms won't yet be marked as dynamic. */
2403 if (h->dynindx == -1
2404 && !h->forced_local)
2405 {
2406 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2407 return FALSE;
2408 }
2409
2410 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info->shared, h))
2411 {
2412 asection *s = htab->splt;
2413
2414 /* The first entry in .plt is reserved. */
2415 if (s->size == 0)
2416 s->size = PLT_ENTRY_SIZE;
2417
2418 h->plt.offset = s->size;
2419
2420 /* If this symbol is not defined in a regular file, and we are
2421 not generating a shared library, then set the symbol to this
2422 location in the .plt. This is required to make function
2423 pointers compare as equal between the normal executable and
2424 the shared library. */
2425 if (! info->shared
2426 && !h->def_regular)
2427 {
2428 h->root.u.def.section = s;
2429 h->root.u.def.value = h->plt.offset;
2430 }
2431
2432 /* Make room for this entry. */
2433 s->size += PLT_ENTRY_SIZE;
2434
2435 /* We also need to make an entry in the .got.plt section, which
2436 will be placed in the .got section by the linker script. */
2437 htab->sgotplt->size += 4;
2438
2439 /* We also need to make an entry in the .rel.plt section. */
2440 htab->srelplt->size += sizeof (Elf32_External_Rela);
2441 }
2442 else
2443 {
2444 h->plt.offset = (bfd_vma) -1;
2445 h->needs_plt = 0;
2446 }
2447 }
2448 else
2449 {
2450 h->plt.offset = (bfd_vma) -1;
2451 h->needs_plt = 0;
2452 }
2453
2454 if (h->got.refcount > 0)
2455 {
2456 asection *s;
2457
2458 /* Make sure this symbol is output as a dynamic symbol.
2459 Undefined weak syms won't yet be marked as dynamic. */
2460 if (h->dynindx == -1
2461 && !h->forced_local)
2462 {
2463 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2464 return FALSE;
2465 }
2466
2467 s = htab->sgot;
2468 h->got.offset = s->size;
2469 s->size += 4;
2470 htab->srelgot->size += sizeof (Elf32_External_Rela);
2471 }
2472 else
2473 h->got.offset = (bfd_vma) -1;
2474
2475 eh = (struct elf32_mb_link_hash_entry *) h;
2476 if (eh->dyn_relocs == NULL)
2477 return TRUE;
2478
2479 /* In the shared -Bsymbolic case, discard space allocated for
2480 dynamic pc-relative relocs against symbols which turn out to be
2481 defined in regular objects. For the normal shared case, discard
2482 space for pc-relative relocs that have become local due to symbol
2483 visibility changes. */
2484
2485 if (info->shared)
2486 {
2487 if (h->def_regular
2488 && (h->forced_local
2489 || info->symbolic))
2490 {
2491 struct elf32_mb_dyn_relocs **pp;
2492
2493 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2494 {
2495 p->count -= p->pc_count;
2496 p->pc_count = 0;
2497 if (p->count == 0)
2498 *pp = p->next;
2499 else
2500 pp = &p->next;
2501 }
2502 }
2503 }
2504 else
2505 {
2506 /* For the non-shared case, discard space for relocs against
2507 symbols which turn out to need copy relocs or are not
2508 dynamic. */
2509
2510 if (!h->non_got_ref
2511 && ((h->def_dynamic
2512 && !h->def_regular)
2513 || (htab->elf.dynamic_sections_created
2514 && (h->root.type == bfd_link_hash_undefweak
2515 || h->root.type == bfd_link_hash_undefined))))
2516 {
2517 /* Make sure this symbol is output as a dynamic symbol.
2518 Undefined weak syms won't yet be marked as dynamic. */
2519 if (h->dynindx == -1
2520 && !h->forced_local)
2521 {
2522 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2523 return FALSE;
2524 }
2525
2526 /* If that succeeded, we know we'll be keeping all the
2527 relocs. */
2528 if (h->dynindx != -1)
2529 goto keep;
2530 }
2531
2532 eh->dyn_relocs = NULL;
2533
2534 keep: ;
2535 }
2536
2537 /* Finally, allocate space. */
2538 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2539 {
2540 asection *sreloc = elf_section_data (p->sec)->sreloc;
2541 sreloc->size += p->count * sizeof (Elf32_External_Rela);
2542 }
2543
2544 return TRUE;
2545 }
2546
2547 /* Set the sizes of the dynamic sections. */
2548
2549 static bfd_boolean
2550 microblaze_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2551 struct bfd_link_info *info)
2552 {
2553 struct elf32_mb_link_hash_table *htab;
2554 bfd *dynobj;
2555 asection *s;
2556 bfd *ibfd;
2557
2558 htab = elf32_mb_hash_table (info);
2559 dynobj = htab->elf.dynobj;
2560 BFD_ASSERT (dynobj != NULL);
2561
2562 /* Set up .got offsets for local syms, and space for local dynamic
2563 relocs. */
2564 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2565 {
2566 bfd_signed_vma *local_got;
2567 bfd_signed_vma *end_local_got;
2568 bfd_size_type locsymcount;
2569 Elf_Internal_Shdr *symtab_hdr;
2570 asection *srel;
2571
2572 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2573 continue;
2574
2575 for (s = ibfd->sections; s != NULL; s = s->next)
2576 {
2577 struct elf32_mb_dyn_relocs *p;
2578
2579 for (p = ((struct elf32_mb_dyn_relocs *)
2580 elf_section_data (s)->local_dynrel);
2581 p != NULL;
2582 p = p->next)
2583 {
2584 if (!bfd_is_abs_section (p->sec)
2585 && bfd_is_abs_section (p->sec->output_section))
2586 {
2587 /* Input section has been discarded, either because
2588 it is a copy of a linkonce section or due to
2589 linker script /DISCARD/, so we'll be discarding
2590 the relocs too. */
2591 }
2592 else if (p->count != 0)
2593 {
2594 srel = elf_section_data (p->sec)->sreloc;
2595 srel->size += p->count * sizeof (Elf32_External_Rela);
2596 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2597 info->flags |= DF_TEXTREL;
2598 }
2599 }
2600 }
2601
2602 local_got = elf_local_got_refcounts (ibfd);
2603 if (!local_got)
2604 continue;
2605
2606 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2607 locsymcount = symtab_hdr->sh_info;
2608 end_local_got = local_got + locsymcount;
2609 s = htab->sgot;
2610 srel = htab->srelgot;
2611
2612 for (; local_got < end_local_got; ++local_got)
2613 {
2614 if (*local_got > 0)
2615 {
2616 *local_got = s->size;
2617 s->size += 4;
2618 if (info->shared)
2619 srel->size += sizeof (Elf32_External_Rela);
2620 }
2621 else
2622 *local_got = (bfd_vma) -1;
2623 }
2624 }
2625
2626 /* Allocate global sym .plt and .got entries, and space for global
2627 sym dynamic relocs. */
2628 elf_link_hash_traverse (elf_hash_table (info), allocate_dynrelocs, info);
2629
2630 if (elf_hash_table (info)->dynamic_sections_created)
2631 {
2632 /* Make space for the trailing nop in .plt. */
2633 if (htab->splt->size > 0)
2634 htab->splt->size += 4;
2635 }
2636
2637 /* The check_relocs and adjust_dynamic_symbol entry points have
2638 determined the sizes of the various dynamic sections. Allocate
2639 memory for them. */
2640 for (s = dynobj->sections; s != NULL; s = s->next)
2641 {
2642 const char *name;
2643 bfd_boolean strip = FALSE;
2644
2645 if ((s->flags & SEC_LINKER_CREATED) == 0)
2646 continue;
2647
2648 /* It's OK to base decisions on the section name, because none
2649 of the dynobj section names depend upon the input files. */
2650 name = bfd_get_section_name (dynobj, s);
2651
2652 if (strncmp (name, ".rela", 5) == 0)
2653 {
2654 if (s->size == 0)
2655 {
2656 /* If we don't need this section, strip it from the
2657 output file. This is to handle .rela.bss and
2658 .rela.plt. We must create it in
2659 create_dynamic_sections, because it must be created
2660 before the linker maps input sections to output
2661 sections. The linker does that before
2662 adjust_dynamic_symbol is called, and it is that
2663 function which decides whether anything needs to go
2664 into these sections. */
2665 strip = TRUE;
2666 }
2667 else
2668 {
2669 /* We use the reloc_count field as a counter if we need
2670 to copy relocs into the output file. */
2671 s->reloc_count = 0;
2672 }
2673 }
2674 else if (s != htab->splt && s != htab->sgot && s != htab->sgotplt)
2675 {
2676 /* It's not one of our sections, so don't allocate space. */
2677 continue;
2678 }
2679
2680 if (strip)
2681 {
2682 s->flags |= SEC_EXCLUDE;
2683 continue;
2684 }
2685
2686 /* Allocate memory for the section contents. */
2687 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
2688 Unused entries should be reclaimed before the section's contents
2689 are written out, but at the moment this does not happen. Thus in
2690 order to prevent writing out garbage, we initialise the section's
2691 contents to zero. */
2692 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2693 if (s->contents == NULL && s->size != 0)
2694 return FALSE;
2695 }
2696
2697 if (elf_hash_table (info)->dynamic_sections_created)
2698 {
2699 /* Add some entries to the .dynamic section. We fill in the
2700 values later, in microblaze_elf_finish_dynamic_sections, but we
2701 must add the entries now so that we get the correct size for
2702 the .dynamic section. The DT_DEBUG entry is filled in by the
2703 dynamic linker and used by the debugger. */
2704 #define add_dynamic_entry(TAG, VAL) \
2705 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2706
2707 if (info->executable)
2708 {
2709 if (!add_dynamic_entry (DT_DEBUG, 0))
2710 return FALSE;
2711 }
2712
2713 if (!add_dynamic_entry (DT_RELA, 0)
2714 || !add_dynamic_entry (DT_RELASZ, 0)
2715 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2716 return FALSE;
2717
2718 if (htab->splt->size != 0)
2719 {
2720 if (!add_dynamic_entry (DT_PLTGOT, 0)
2721 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2722 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2723 || !add_dynamic_entry (DT_JMPREL, 0)
2724 || !add_dynamic_entry (DT_BIND_NOW, 1))
2725 return FALSE;
2726 }
2727
2728 if (info->flags & DF_TEXTREL)
2729 {
2730 if (!add_dynamic_entry (DT_TEXTREL, 0))
2731 return FALSE;
2732 }
2733 }
2734 #undef add_dynamic_entry
2735 return TRUE;
2736 }
2737
2738 /* Finish up dynamic symbol handling. We set the contents of various
2739 dynamic sections here. */
2740
2741 static bfd_boolean
2742 microblaze_elf_finish_dynamic_symbol (bfd *output_bfd,
2743 struct bfd_link_info *info,
2744 struct elf_link_hash_entry *h,
2745 Elf_Internal_Sym *sym)
2746 {
2747 bfd *dynobj;
2748 struct elf32_mb_link_hash_table *htab;
2749
2750 htab = elf32_mb_hash_table (info);
2751 dynobj = htab->elf.dynobj;
2752
2753 if (h->plt.offset != (bfd_vma) -1)
2754 {
2755 asection *splt;
2756 asection *srela;
2757 asection *sgotplt;
2758 Elf_Internal_Rela rela;
2759 bfd_byte *loc;
2760 bfd_vma plt_index;
2761 bfd_vma got_offset;
2762 bfd_vma got_addr;
2763
2764 /* This symbol has an entry in the procedure linkage table. Set
2765 it up. */
2766 BFD_ASSERT (h->dynindx != -1);
2767
2768 splt = htab->splt;
2769 srela = htab->srelplt;
2770 sgotplt = htab->sgotplt;
2771 BFD_ASSERT (splt != NULL && srela != NULL && sgotplt != NULL);
2772
2773 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; /* first entry reserved. */
2774 got_offset = (plt_index + 3) * 4; /* 3 reserved ??? */
2775 got_addr = got_offset;
2776
2777 /* For non-PIC objects we need absolute address of the GOT entry. */
2778 if (!info->shared)
2779 got_addr += htab->sgotplt->output_section->vma + sgotplt->output_offset;
2780
2781 /* Fill in the entry in the procedure linkage table. */
2782 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_0 + ((got_addr >> 16) & 0xffff),
2783 splt->contents + h->plt.offset);
2784 if (info->shared)
2785 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_1 + (got_addr & 0xffff),
2786 splt->contents + h->plt.offset + 4);
2787 else
2788 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_1_NOPIC + (got_addr & 0xffff),
2789 splt->contents + h->plt.offset + 4);
2790 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD_2,
2791 splt->contents + h->plt.offset + 8);
2792 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD_3,
2793 splt->contents + h->plt.offset + 12);
2794
2795 /* Any additions to the .got section??? */
2796 /* bfd_put_32 (output_bfd,
2797 splt->output_section->vma + splt->output_offset + h->plt.offset + 4,
2798 sgotplt->contents + got_offset); */
2799
2800 /* Fill in the entry in the .rela.plt section. */
2801 rela.r_offset = (sgotplt->output_section->vma
2802 + sgotplt->output_offset
2803 + got_offset);
2804 rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_JUMP_SLOT);
2805 rela.r_addend = 0;
2806 loc = srela->contents;
2807 loc += plt_index * sizeof (Elf32_External_Rela);
2808 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
2809
2810 if (!h->def_regular)
2811 {
2812 /* Mark the symbol as undefined, rather than as defined in
2813 the .plt section. Zero the value. */
2814 sym->st_shndx = SHN_UNDEF;
2815 sym->st_value = 0;
2816 }
2817 }
2818
2819 if (h->got.offset != (bfd_vma) -1)
2820 {
2821 asection *sgot;
2822 asection *srela;
2823 Elf_Internal_Rela rela;
2824 bfd_byte *loc;
2825
2826 /* This symbol has an entry in the global offset table. Set it
2827 up. */
2828
2829 sgot = htab->sgot;
2830 srela = htab->srelgot;
2831 BFD_ASSERT (sgot != NULL && srela != NULL);
2832
2833 rela.r_offset = (sgot->output_section->vma
2834 + sgot->output_offset
2835 + (h->got.offset &~ (bfd_vma) 1));
2836
2837 /* If this is a -Bsymbolic link, and the symbol is defined
2838 locally, we just want to emit a RELATIVE reloc. Likewise if
2839 the symbol was forced to be local because of a version file.
2840 The entry in the global offset table will already have been
2841 initialized in the relocate_section function. */
2842 if (info->shared
2843 && (info->symbolic || h->dynindx == -1)
2844 && h->def_regular)
2845 {
2846 asection *sec = h->root.u.def.section;
2847 rela.r_info = ELF32_R_INFO (0, R_MICROBLAZE_REL);
2848 rela.r_addend = (h->root.u.def.value
2849 + sec->output_section->vma
2850 + sec->output_offset);
2851 }
2852 else
2853 {
2854 rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_GLOB_DAT);
2855 rela.r_addend = 0;
2856 }
2857
2858 bfd_put_32 (output_bfd, (bfd_vma) 0,
2859 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
2860 loc = srela->contents;
2861 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
2862 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
2863 }
2864
2865 if (h->needs_copy)
2866 {
2867 asection *s;
2868 Elf_Internal_Rela rela;
2869 bfd_byte *loc;
2870
2871 /* This symbols needs a copy reloc. Set it up. */
2872
2873 BFD_ASSERT (h->dynindx != -1);
2874
2875 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2876 ".rela.bss");
2877 BFD_ASSERT (s != NULL);
2878
2879 rela.r_offset = (h->root.u.def.value
2880 + h->root.u.def.section->output_section->vma
2881 + h->root.u.def.section->output_offset);
2882 rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_COPY);
2883 rela.r_addend = 0;
2884 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
2885 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
2886 }
2887
2888 /* Mark some specially defined symbols as absolute. */
2889 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2890 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2891 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
2892 sym->st_shndx = SHN_ABS;
2893
2894 return TRUE;
2895 }
2896
2897
2898 /* Finish up the dynamic sections. */
2899
2900 static bfd_boolean
2901 microblaze_elf_finish_dynamic_sections (bfd *output_bfd,
2902 struct bfd_link_info *info)
2903 {
2904 bfd *dynobj;
2905 asection *sdyn, *sgot;
2906 struct elf32_mb_link_hash_table *htab;
2907
2908 htab = elf32_mb_hash_table (info);
2909 dynobj = htab->elf.dynobj;
2910
2911 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2912
2913 if (htab->elf.dynamic_sections_created)
2914 {
2915 asection *splt;
2916 Elf32_External_Dyn *dyncon, *dynconend;
2917
2918 splt = bfd_get_section_by_name (dynobj, ".plt");
2919 BFD_ASSERT (splt != NULL && sdyn != NULL);
2920
2921 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2922 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2923 for (; dyncon < dynconend; dyncon++)
2924 {
2925 Elf_Internal_Dyn dyn;
2926 const char *name;
2927 bfd_boolean size;
2928
2929 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2930
2931 switch (dyn.d_tag)
2932 {
2933 case DT_PLTGOT: name = ".got.plt"; size = FALSE; break;
2934 case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break;
2935 case DT_JMPREL: name = ".rela.plt"; size = FALSE; break;
2936 case DT_RELA: name = ".rela.dyn"; size = FALSE; break;
2937 case DT_RELASZ: name = ".rela.dyn"; size = TRUE; break;
2938 default: name = NULL; size = FALSE; break;
2939 }
2940
2941 if (name != NULL)
2942 {
2943 asection *s;
2944
2945 s = bfd_get_section_by_name (output_bfd, name);
2946 if (s == NULL)
2947 dyn.d_un.d_val = 0;
2948 else
2949 {
2950 if (! size)
2951 dyn.d_un.d_ptr = s->vma;
2952 else
2953 dyn.d_un.d_val = s->size;
2954 }
2955 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2956 }
2957 }
2958
2959 /* Clear the first entry in the procedure linkage table,
2960 and put a nop in the last four bytes. */
2961 if (splt->size > 0)
2962 {
2963 memset (splt->contents, 0, PLT_ENTRY_SIZE);
2964 bfd_put_32 (output_bfd, (bfd_vma) 0x80000000 /* nop. */,
2965 splt->contents + splt->size - 4);
2966 }
2967
2968 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
2969 }
2970
2971 /* Set the first entry in the global offset table to the address of
2972 the dynamic section. */
2973 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2974 if (sgot && sgot->size > 0)
2975 {
2976 if (sdyn == NULL)
2977 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2978 else
2979 bfd_put_32 (output_bfd,
2980 sdyn->output_section->vma + sdyn->output_offset,
2981 sgot->contents);
2982 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2983 }
2984
2985 if (htab->sgot && htab->sgot->size > 0)
2986 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
2987
2988 return TRUE;
2989 }
2990
2991 /* Hook called by the linker routine which adds symbols from an object
2992 file. We use it to put .comm items in .sbss, and not .bss. */
2993
2994 static bfd_boolean
2995 microblaze_elf_add_symbol_hook (bfd *abfd,
2996 struct bfd_link_info *info,
2997 Elf_Internal_Sym *sym,
2998 const char **namep ATTRIBUTE_UNUSED,
2999 flagword *flagsp ATTRIBUTE_UNUSED,
3000 asection **secp,
3001 bfd_vma *valp)
3002 {
3003 if (sym->st_shndx == SHN_COMMON
3004 && !info->relocatable
3005 && sym->st_size <= elf_gp_size (abfd))
3006 {
3007 /* Common symbols less than or equal to -G nn bytes are automatically
3008 put into .sbss. */
3009 *secp = bfd_make_section_anyway (abfd, ".sbss");
3010 if (*secp == NULL
3011 || ! bfd_set_section_flags (abfd, *secp, SEC_IS_COMMON))
3012 return FALSE;
3013
3014 *valp = sym->st_size;
3015 }
3016
3017 return TRUE;
3018 }
3019
3020
3021 #define TARGET_BIG_SYM bfd_elf32_microblaze_vec
3022 #define TARGET_BIG_NAME "elf32-microblaze"
3023
3024 #define ELF_ARCH bfd_arch_microblaze
3025 #define ELF_MACHINE_CODE EM_MICROBLAZE
3026 #define ELF_MACHINE_ALT1 EM_MICROBLAZE_OLD
3027 #define ELF_MAXPAGESIZE 0x4 /* 4k, if we ever have 'em. */
3028 #define elf_info_to_howto microblaze_elf_info_to_howto
3029 #define elf_info_to_howto_rel NULL
3030
3031 #define bfd_elf32_bfd_reloc_type_lookup microblaze_elf_reloc_type_lookup
3032 #define bfd_elf32_bfd_is_local_label_name microblaze_elf_is_local_label_name
3033 #define elf_backend_relocate_section microblaze_elf_relocate_section
3034 #define bfd_elf32_bfd_relax_section microblaze_elf_relax_section
3035 #define bfd_elf32_bfd_reloc_name_lookup microblaze_elf_reloc_name_lookup
3036
3037 #define elf_backend_gc_mark_hook microblaze_elf_gc_mark_hook
3038 #define elf_backend_gc_sweep_hook microblaze_elf_gc_sweep_hook
3039 #define elf_backend_check_relocs microblaze_elf_check_relocs
3040 #define elf_backend_copy_indirect_symbol microblaze_elf_copy_indirect_symbol
3041 #define bfd_elf32_bfd_link_hash_table_create microblaze_elf_link_hash_table_create
3042 #define elf_backend_can_gc_sections 1
3043 #define elf_backend_can_refcount 1
3044 #define elf_backend_want_got_plt 1
3045 #define elf_backend_plt_readonly 1
3046 #define elf_backend_got_header_size 12
3047 #define elf_backend_rela_normal 1
3048
3049 #define elf_backend_adjust_dynamic_symbol microblaze_elf_adjust_dynamic_symbol
3050 #define elf_backend_create_dynamic_sections microblaze_elf_create_dynamic_sections
3051 #define elf_backend_finish_dynamic_sections microblaze_elf_finish_dynamic_sections
3052 #define elf_backend_finish_dynamic_symbol microblaze_elf_finish_dynamic_symbol
3053 #define elf_backend_size_dynamic_sections microblaze_elf_size_dynamic_sections
3054 #define elf_backend_add_symbol_hook microblaze_elf_add_symbol_hook
3055
3056 #include "elf32-target.h"
GDB Binutils - Deliverables
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