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2010-04-05 Kai Tietz <kai.tietz@onevision.com>
[binutils.git] / bfd / elf32-microblaze.c
blobda80c853589d7814d8e1ac7e6262e5c3ffe11c6e
1 /* Xilinx MicroBlaze-specific support for 32-bit ELF
2
3 Copyright 2009, 2010 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 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
580 == MICROBLAZE_ELF_DATA ? ((struct elf32_mb_link_hash_table *) ((p)->hash)) : NULL)
581
582 /* Create an entry in a microblaze ELF linker hash table. */
583
584 static struct bfd_hash_entry *
585 link_hash_newfunc (struct bfd_hash_entry *entry,
586 struct bfd_hash_table *table,
587 const char *string)
588 {
589 /* Allocate the structure if it has not already been allocated by a
590 subclass. */
591 if (entry == NULL)
592 {
593 entry = bfd_hash_allocate (table,
594 sizeof (struct elf32_mb_link_hash_entry));
595 if (entry == NULL)
596 return entry;
597 }
598
599 /* Call the allocation method of the superclass. */
600 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
601 if (entry != NULL)
602 {
603 struct elf32_mb_link_hash_entry *eh;
604
605 eh = (struct elf32_mb_link_hash_entry *) entry;
606 eh->dyn_relocs = NULL;
607 }
608
609 return entry;
610 }
611
612 /* Create a mb ELF linker hash table. */
613
614 static struct bfd_link_hash_table *
615 microblaze_elf_link_hash_table_create (bfd *abfd)
616 {
617 struct elf32_mb_link_hash_table *ret;
618 bfd_size_type amt = sizeof (struct elf32_mb_link_hash_table);
619
620 ret = (struct elf32_mb_link_hash_table *) bfd_zmalloc (amt);
621 if (ret == NULL)
622 return NULL;
623
624 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
625 sizeof (struct elf32_mb_link_hash_entry),
626 MICROBLAZE_ELF_DATA))
627 {
628 free (ret);
629 return NULL;
630 }
631
632 return &ret->elf.root;
633 }
634 \f
635 /* Set the values of the small data pointers. */
636
637 static void
638 microblaze_elf_final_sdp (struct bfd_link_info *info)
639 {
640 struct bfd_link_hash_entry *h;
641
642 h = bfd_link_hash_lookup (info->hash, RO_SDA_ANCHOR_NAME, FALSE, FALSE, TRUE);
643 if (h != (struct bfd_link_hash_entry *) NULL
644 && h->type == bfd_link_hash_defined)
645 ro_small_data_pointer = (h->u.def.value
646 + h->u.def.section->output_section->vma
647 + h->u.def.section->output_offset);
648
649 h = bfd_link_hash_lookup (info->hash, RW_SDA_ANCHOR_NAME, FALSE, FALSE, TRUE);
650 if (h != (struct bfd_link_hash_entry *) NULL
651 && h->type == bfd_link_hash_defined)
652 rw_small_data_pointer = (h->u.def.value
653 + h->u.def.section->output_section->vma
654 + h->u.def.section->output_offset);
655 }
656
657 /* This code is taken from elf32-m32r.c
658 There is some attempt to make this function usable for many architectures,
659 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
660 if only to serve as a learning tool.
661
662 The RELOCATE_SECTION function is called by the new ELF backend linker
663 to handle the relocations for a section.
664
665 The relocs are always passed as Rela structures; if the section
666 actually uses Rel structures, the r_addend field will always be
667 zero.
668
669 This function is responsible for adjust the section contents as
670 necessary, and (if using Rela relocs and generating a
671 relocatable output file) adjusting the reloc addend as
672 necessary.
673
674 This function does not have to worry about setting the reloc
675 address or the reloc symbol index.
676
677 LOCAL_SYMS is a pointer to the swapped in local symbols.
678
679 LOCAL_SECTIONS is an array giving the section in the input file
680 corresponding to the st_shndx field of each local symbol.
681
682 The global hash table entry for the global symbols can be found
683 via elf_sym_hashes (input_bfd).
684
685 When generating relocatable output, this function must handle
686 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
687 going to be the section symbol corresponding to the output
688 section, which means that the addend must be adjusted
689 accordingly. */
690
691 static bfd_boolean
692 microblaze_elf_relocate_section (bfd *output_bfd,
693 struct bfd_link_info *info,
694 bfd *input_bfd,
695 asection *input_section,
696 bfd_byte *contents,
697 Elf_Internal_Rela *relocs,
698 Elf_Internal_Sym *local_syms,
699 asection **local_sections)
700 {
701 struct elf32_mb_link_hash_table *htab;
702 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
703 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
704 Elf_Internal_Rela *rel, *relend;
705 /* Assume success. */
706 bfd_boolean ret = TRUE;
707 asection *sreloc;
708 bfd_vma *local_got_offsets;
709
710 if (!microblaze_elf_howto_table[R_MICROBLAZE_max-1])
711 microblaze_elf_howto_init ();
712
713 htab = elf32_mb_hash_table (info);
714 if (htab == NULL)
715 return FALSE;
716
717 local_got_offsets = elf_local_got_offsets (input_bfd);
718
719 sreloc = elf_section_data (input_section)->sreloc;
720
721 rel = relocs;
722 relend = relocs + input_section->reloc_count;
723 for (; rel < relend; rel++)
724 {
725 int r_type;
726 reloc_howto_type *howto;
727 unsigned long r_symndx;
728 bfd_vma addend = rel->r_addend;
729 bfd_vma offset = rel->r_offset;
730 struct elf_link_hash_entry *h;
731 Elf_Internal_Sym *sym;
732 asection *sec;
733 const char *sym_name;
734 bfd_reloc_status_type r = bfd_reloc_ok;
735 const char *errmsg = NULL;
736 bfd_boolean unresolved_reloc = FALSE;
737
738 h = NULL;
739 r_type = ELF32_R_TYPE (rel->r_info);
740 if (r_type < 0 || r_type >= (int) R_MICROBLAZE_max)
741 {
742 (*_bfd_error_handler) (_("%s: unknown relocation type %d"),
743 bfd_get_filename (input_bfd), (int) r_type);
744 bfd_set_error (bfd_error_bad_value);
745 ret = FALSE;
746 continue;
747 }
748
749 howto = microblaze_elf_howto_table[r_type];
750 r_symndx = ELF32_R_SYM (rel->r_info);
751
752 if (info->relocatable)
753 {
754 /* This is a relocatable link. We don't have to change
755 anything, unless the reloc is against a section symbol,
756 in which case we have to adjust according to where the
757 section symbol winds up in the output section. */
758 sec = NULL;
759 if (r_symndx >= symtab_hdr->sh_info)
760 /* External symbol. */
761 continue;
762
763 /* Local symbol. */
764 sym = local_syms + r_symndx;
765 sym_name = "<local symbol>";
766 /* STT_SECTION: symbol is associated with a section. */
767 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
768 /* Symbol isn't associated with a section. Nothing to do. */
769 continue;
770
771 sec = local_sections[r_symndx];
772 addend += sec->output_offset + sym->st_value;
773 #ifndef USE_REL
774 /* This can't be done for USE_REL because it doesn't mean anything
775 and elf_link_input_bfd asserts this stays zero. */
776 /* rel->r_addend = addend; */
777 #endif
778
779 #ifndef USE_REL
780 /* Addends are stored with relocs. We're done. */
781 continue;
782 #else /* USE_REL */
783 /* If partial_inplace, we need to store any additional addend
784 back in the section. */
785 if (!howto->partial_inplace)
786 continue;
787 /* ??? Here is a nice place to call a special_function like handler. */
788 r = _bfd_relocate_contents (howto, input_bfd, addend,
789 contents + offset);
790 #endif /* USE_REL */
791 }
792 else
793 {
794 bfd_vma relocation;
795
796 /* This is a final link. */
797 sym = NULL;
798 sec = NULL;
799 unresolved_reloc = FALSE;
800
801 if (r_symndx < symtab_hdr->sh_info)
802 {
803 /* Local symbol. */
804 sym = local_syms + r_symndx;
805 sec = local_sections[r_symndx];
806 if (sec == 0)
807 continue;
808 sym_name = "<local symbol>";
809 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
810 /* r_addend may have changed if the reference section was
811 a merge section. */
812 addend = rel->r_addend;
813 }
814 else
815 {
816 /* External symbol. */
817 bfd_boolean warned ATTRIBUTE_UNUSED;
818
819 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
820 r_symndx, symtab_hdr, sym_hashes,
821 h, sec, relocation,
822 unresolved_reloc, warned);
823 sym_name = h->root.root.string;
824 }
825
826 /* Sanity check the address. */
827 if (offset > bfd_get_section_limit (output_bfd, input_section))
828 {
829 r = bfd_reloc_outofrange;
830 goto check_reloc;
831 }
832
833 switch ((int) r_type)
834 {
835 case (int) R_MICROBLAZE_SRO32 :
836 {
837 const char *name;
838
839 /* Only relocate if the symbol is defined. */
840 if (sec)
841 {
842 name = bfd_get_section_name (abfd, sec);
843
844 if (strcmp (name, ".sdata2") == 0
845 || strcmp (name, ".sbss2") == 0)
846 {
847 if (ro_small_data_pointer == 0)
848 microblaze_elf_final_sdp (info);
849 if (ro_small_data_pointer == 0)
850 {
851 ret = FALSE;
852 r = bfd_reloc_undefined;
853 goto check_reloc;
854 }
855
856 /* At this point `relocation' contains the object's
857 address. */
858 relocation -= ro_small_data_pointer;
859 /* Now it contains the offset from _SDA2_BASE_. */
860 r = _bfd_final_link_relocate (howto, input_bfd,
861 input_section,
862 contents, offset,
863 relocation, addend);
864 }
865 else
866 {
867 (*_bfd_error_handler) (_("%s: The target (%s) of an %s relocation is in the wrong section (%s)"),
868 bfd_get_filename (input_bfd),
869 sym_name,
870 microblaze_elf_howto_table[(int) r_type]->name,
871 bfd_get_section_name (abfd, sec));
872 /*bfd_set_error (bfd_error_bad_value); ??? why? */
873 ret = FALSE;
874 continue;
875 }
876 }
877 }
878 break;
879
880 case (int) R_MICROBLAZE_SRW32 :
881 {
882 const char *name;
883
884 /* Only relocate if the symbol is defined. */
885 if (sec)
886 {
887 name = bfd_get_section_name (abfd, sec);
888
889 if (strcmp (name, ".sdata") == 0
890 || strcmp (name, ".sbss") == 0)
891 {
892 if (rw_small_data_pointer == 0)
893 microblaze_elf_final_sdp (info);
894 if (rw_small_data_pointer == 0)
895 {
896 ret = FALSE;
897 r = bfd_reloc_undefined;
898 goto check_reloc;
899 }
900
901 /* At this point `relocation' contains the object's
902 address. */
903 relocation -= rw_small_data_pointer;
904 /* Now it contains the offset from _SDA_BASE_. */
905 r = _bfd_final_link_relocate (howto, input_bfd,
906 input_section,
907 contents, offset,
908 relocation, addend);
909 }
910 else
911 {
912 (*_bfd_error_handler) (_("%s: The target (%s) of an %s relocation is in the wrong section (%s)"),
913 bfd_get_filename (input_bfd),
914 sym_name,
915 microblaze_elf_howto_table[(int) r_type]->name,
916 bfd_get_section_name (abfd, sec));
917 /*bfd_set_error (bfd_error_bad_value); ??? why? */
918 ret = FALSE;
919 continue;
920 }
921 }
922 }
923 break;
924
925 case (int) R_MICROBLAZE_32_SYM_OP_SYM:
926 break; /* Do nothing. */
927
928 case (int) R_MICROBLAZE_GOTPC_64:
929 relocation = htab->sgotplt->output_section->vma
930 + htab->sgotplt->output_offset;
931 relocation -= (input_section->output_section->vma
932 + input_section->output_offset
933 + offset + INST_WORD_SIZE);
934 relocation += addend;
935 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
936 contents + offset + 2);
937 bfd_put_16 (input_bfd, relocation & 0xffff,
938 contents + offset + 2 + INST_WORD_SIZE);
939 break;
940
941 case (int) R_MICROBLAZE_PLT_64:
942 {
943 bfd_vma immediate;
944 if (htab->splt != NULL && h != NULL
945 && h->plt.offset != (bfd_vma) -1)
946 {
947 relocation = (htab->splt->output_section->vma
948 + htab->splt->output_offset
949 + h->plt.offset);
950 unresolved_reloc = FALSE;
951 immediate = relocation - (input_section->output_section->vma
952 + input_section->output_offset
953 + offset + INST_WORD_SIZE);
954 bfd_put_16 (input_bfd, (immediate >> 16) & 0xffff,
955 contents + offset + 2);
956 bfd_put_16 (input_bfd, immediate & 0xffff,
957 contents + offset + 2 + INST_WORD_SIZE);
958 }
959 else
960 {
961 relocation -= (input_section->output_section->vma
962 + input_section->output_offset
963 + offset + INST_WORD_SIZE);
964 immediate = relocation;
965 bfd_put_16 (input_bfd, (immediate >> 16) & 0xffff,
966 contents + offset + 2);
967 bfd_put_16 (input_bfd, immediate & 0xffff,
968 contents + offset + 2 + INST_WORD_SIZE);
969 }
970 break;
971 }
972
973 case (int) R_MICROBLAZE_GOT_64:
974 {
975 if (htab->sgot == NULL)
976 abort ();
977 if (h == NULL)
978 {
979 bfd_vma off;
980 if (local_got_offsets == NULL)
981 abort ();
982 off = local_got_offsets[r_symndx];
983 /* The LSB indicates whether we've already
984 created relocation. */
985 if (off & 1)
986 off &= ~1;
987 else
988 {
989 bfd_put_32 (output_bfd, relocation + addend,
990 htab->sgot->contents + off);
991
992 if (info->shared)
993 {
994 Elf_Internal_Rela outrel;
995 bfd_byte *loc;
996 if (htab->srelgot == NULL)
997 abort ();
998 outrel.r_offset = (htab->sgot->output_section->vma
999 + htab->sgot->output_offset
1000 + off);
1001 outrel.r_info = ELF32_R_INFO (0, R_MICROBLAZE_REL);
1002 outrel.r_addend = relocation + addend;
1003 loc = htab->srelgot->contents;
1004 loc += htab->srelgot->reloc_count++
1005 * sizeof (Elf32_External_Rela);
1006 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1007 }
1008 local_got_offsets[r_symndx] |= 1;
1009 }
1010 relocation = htab->sgot->output_section->vma
1011 + htab->sgot->output_offset + off
1012 - htab->sgotplt->output_section->vma
1013 - htab->sgotplt->output_offset;
1014 unresolved_reloc = FALSE;
1015 }
1016 else
1017 {
1018 if (htab->sgotplt != NULL && h != NULL
1019 && h->got.offset != (bfd_vma) -1)
1020 {
1021 bfd_put_32 (output_bfd, relocation + addend,
1022 htab->sgot->contents + h->got.offset);
1023 relocation = htab->sgot->output_section->vma
1024 + htab->sgot->output_offset
1025 + h->got.offset
1026 - htab->sgotplt->output_section->vma
1027 - htab->sgotplt->output_offset;
1028 unresolved_reloc = FALSE;
1029 }
1030 else
1031 abort (); /* ??? */
1032 }
1033 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1034 contents + offset + 2);
1035 bfd_put_16 (input_bfd, relocation & 0xffff,
1036 contents + offset + 2 + INST_WORD_SIZE);
1037 break;
1038 }
1039
1040 case (int) R_MICROBLAZE_GOTOFF_64:
1041 {
1042 bfd_vma immediate;
1043 unsigned short lo, high;
1044 relocation += addend;
1045 relocation -= htab->sgotplt->output_section->vma
1046 + htab->sgotplt->output_offset;
1047 /* Write this value into correct location. */
1048 immediate = relocation;
1049 lo = immediate & 0x0000ffff;
1050 high = (immediate >> 16) & 0x0000ffff;
1051 bfd_put_16 (input_bfd, high, contents + offset + 2);
1052 bfd_put_16 (input_bfd, lo, contents + offset + INST_WORD_SIZE + 2);
1053 break;
1054 }
1055
1056 case (int) R_MICROBLAZE_GOTOFF_32:
1057 {
1058 relocation += addend;
1059 relocation -= htab->sgotplt->output_section->vma
1060 + htab->sgotplt->output_offset;
1061 /* Write this value into correct location. */
1062 bfd_put_32 (input_bfd, relocation, contents + offset);
1063 break;
1064 }
1065
1066 case (int) R_MICROBLAZE_64_PCREL :
1067 case (int) R_MICROBLAZE_64:
1068 case (int) R_MICROBLAZE_32:
1069 {
1070 /* r_symndx will be zero only for relocs against symbols
1071 from removed linkonce sections, or sections discarded by
1072 a linker script. */
1073 if (r_symndx == 0 || (input_section->flags & SEC_ALLOC) == 0)
1074 {
1075 relocation += addend;
1076 if (r_type == R_MICROBLAZE_32)
1077 bfd_put_32 (input_bfd, relocation, contents + offset);
1078 else
1079 {
1080 if (r_type == R_MICROBLAZE_64_PCREL)
1081 relocation -= (input_section->output_section->vma
1082 + input_section->output_offset
1083 + offset + INST_WORD_SIZE);
1084 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1085 contents + offset + 2);
1086 bfd_put_16 (input_bfd, relocation & 0xffff,
1087 contents + offset + 2 + INST_WORD_SIZE);
1088 }
1089 break;
1090 }
1091
1092 if ((info->shared
1093 && (h == NULL
1094 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1095 || h->root.type != bfd_link_hash_undefweak)
1096 && (!howto->pc_relative
1097 || (h != NULL
1098 && h->dynindx != -1
1099 && (!info->symbolic
1100 || !h->def_regular))))
1101 || (!info->shared
1102 && h != NULL
1103 && h->dynindx != -1
1104 && !h->non_got_ref
1105 && ((h->def_dynamic
1106 && !h->def_regular)
1107 || h->root.type == bfd_link_hash_undefweak
1108 || h->root.type == bfd_link_hash_undefined)))
1109 {
1110 Elf_Internal_Rela outrel;
1111 bfd_byte *loc;
1112 bfd_boolean skip, relocate = FALSE;
1113
1114 /* When generating a shared object, these relocations
1115 are copied into the output file to be resolved at run
1116 time. */
1117
1118 BFD_ASSERT (sreloc != NULL);
1119
1120 skip = FALSE;
1121
1122 outrel.r_offset =
1123 _bfd_elf_section_offset (output_bfd, info, input_section,
1124 rel->r_offset);
1125 if (outrel.r_offset == (bfd_vma) -1)
1126 skip = TRUE;
1127 else if (outrel.r_offset == (bfd_vma) -2)
1128 skip = TRUE, relocate = TRUE;
1129 outrel.r_offset += (input_section->output_section->vma
1130 + input_section->output_offset);
1131
1132 if (skip)
1133 memset (&outrel, 0, sizeof outrel);
1134 /* h->dynindx may be -1 if the symbol was marked to
1135 become local. */
1136 else if (h != NULL
1137 && ((! info->symbolic && h->dynindx != -1)
1138 || !h->def_regular))
1139 {
1140 BFD_ASSERT (h->dynindx != -1);
1141 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1142 outrel.r_addend = addend;
1143 }
1144 else
1145 {
1146 if (r_type == R_MICROBLAZE_32)
1147 {
1148 outrel.r_info = ELF32_R_INFO (0, R_MICROBLAZE_REL);
1149 outrel.r_addend = relocation + addend;
1150 }
1151 else
1152 {
1153 BFD_FAIL ();
1154 (*_bfd_error_handler)
1155 (_("%B: probably compiled without -fPIC?"),
1156 input_bfd);
1157 bfd_set_error (bfd_error_bad_value);
1158 return FALSE;
1159 }
1160 }
1161
1162 loc = sreloc->contents;
1163 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1164 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1165 break;
1166 }
1167 else
1168 {
1169 relocation += addend;
1170 if (r_type == R_MICROBLAZE_32)
1171 bfd_put_32 (input_bfd, relocation, contents + offset);
1172 else
1173 {
1174 if (r_type == R_MICROBLAZE_64_PCREL)
1175 relocation -= (input_section->output_section->vma
1176 + input_section->output_offset
1177 + offset + INST_WORD_SIZE);
1178 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff,
1179 contents + offset + 2);
1180 bfd_put_16 (input_bfd, relocation & 0xffff,
1181 contents + offset + 2 + INST_WORD_SIZE);
1182 }
1183 break;
1184 }
1185 }
1186
1187 default :
1188 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1189 contents, offset,
1190 relocation, addend);
1191 break;
1192 }
1193 }
1194
1195 check_reloc:
1196
1197 if (r != bfd_reloc_ok)
1198 {
1199 /* FIXME: This should be generic enough to go in a utility. */
1200 const char *name;
1201
1202 if (h != NULL)
1203 name = h->root.root.string;
1204 else
1205 {
1206 name = (bfd_elf_string_from_elf_section
1207 (input_bfd, symtab_hdr->sh_link, sym->st_name));
1208 if (name == NULL || *name == '\0')
1209 name = bfd_section_name (input_bfd, sec);
1210 }
1211
1212 if (errmsg != NULL)
1213 goto common_error;
1214
1215 switch (r)
1216 {
1217 case bfd_reloc_overflow:
1218 if (!((*info->callbacks->reloc_overflow)
1219 (info, (h ? &h->root : NULL), name, howto->name,
1220 (bfd_vma) 0, input_bfd, input_section, offset)))
1221 return FALSE;
1222 break;
1223
1224 case bfd_reloc_undefined:
1225 if (!((*info->callbacks->undefined_symbol)
1226 (info, name, input_bfd, input_section, offset, TRUE)))
1227 return FALSE;
1228 break;
1229
1230 case bfd_reloc_outofrange:
1231 errmsg = _("internal error: out of range error");
1232 goto common_error;
1233
1234 case bfd_reloc_notsupported:
1235 errmsg = _("internal error: unsupported relocation error");
1236 goto common_error;
1237
1238 case bfd_reloc_dangerous:
1239 errmsg = _("internal error: dangerous error");
1240 goto common_error;
1241
1242 default:
1243 errmsg = _("internal error: unknown error");
1244 /* Fall through. */
1245 common_error:
1246 if (!((*info->callbacks->warning)
1247 (info, errmsg, name, input_bfd, input_section, offset)))
1248 return FALSE;
1249 break;
1250 }
1251 }
1252 }
1253
1254 return ret;
1255 }
1256 \f
1257 /* Calculate fixup value for reference. */
1258
1259 static int
1260 calc_fixup (bfd_vma addr, asection *sec)
1261 {
1262 int i, fixup = 0;
1263
1264 if (sec == NULL || sec->relax == NULL)
1265 return 0;
1266
1267 /* Look for addr in relax table, total fixup value. */
1268 for (i = 0; i < sec->relax_count; i++)
1269 {
1270 if (addr <= sec->relax[i].addr)
1271 break;
1272 fixup += sec->relax[i].size;
1273 }
1274
1275 return fixup;
1276 }
1277
1278 static bfd_boolean
1279 microblaze_elf_relax_section (bfd *abfd,
1280 asection *sec,
1281 struct bfd_link_info *link_info,
1282 bfd_boolean *again)
1283 {
1284 Elf_Internal_Shdr *symtab_hdr;
1285 Elf_Internal_Rela *internal_relocs;
1286 Elf_Internal_Rela *free_relocs = NULL;
1287 Elf_Internal_Rela *irel, *irelend;
1288 bfd_byte *contents = NULL;
1289 bfd_byte *free_contents = NULL;
1290 int rel_count;
1291 unsigned int shndx;
1292 int i, sym_index;
1293 asection *o;
1294 struct elf_link_hash_entry *sym_hash;
1295 Elf_Internal_Sym *isymbuf, *isymend;
1296 Elf_Internal_Sym *isym;
1297 int symcount;
1298 int offset;
1299 bfd_vma src, dest;
1300
1301 /* We only do this once per section. We may be able to delete some code
1302 by running multiple passes, but it is not worth it. */
1303 *again = FALSE;
1304
1305 /* Only do this for a text section. */
1306 if (link_info->relocatable
1307 || (sec->flags & SEC_RELOC) == 0
1308 || (sec->reloc_count == 0))
1309 return TRUE;
1310
1311 BFD_ASSERT ((sec->size > 0) || (sec->rawsize > 0));
1312
1313 /* If this is the first time we have been called for this section,
1314 initialize the cooked size. */
1315 if (sec->size == 0)
1316 sec->size = sec->rawsize;
1317
1318 /* Get symbols for this section. */
1319 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1320 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1321 symcount = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
1322 if (isymbuf == NULL)
1323 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, symcount,
1324 0, NULL, NULL, NULL);
1325 BFD_ASSERT (isymbuf != NULL);
1326
1327 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory);
1328 if (internal_relocs == NULL)
1329 goto error_return;
1330 if (! link_info->keep_memory)
1331 free_relocs = internal_relocs;
1332
1333 sec->relax = (struct relax_table *) bfd_malloc ((sec->reloc_count + 1)
1334 * sizeof (struct relax_table));
1335 if (sec->relax == NULL)
1336 goto error_return;
1337 sec->relax_count = 0;
1338
1339 irelend = internal_relocs + sec->reloc_count;
1340 rel_count = 0;
1341 for (irel = internal_relocs; irel < irelend; irel++, rel_count++)
1342 {
1343 bfd_vma symval;
1344 if ((ELF32_R_TYPE (irel->r_info) != (int) R_MICROBLAZE_64_PCREL)
1345 && (ELF32_R_TYPE (irel->r_info) != (int) R_MICROBLAZE_64 ))
1346 continue; /* Can't delete this reloc. */
1347
1348 /* Get the section contents. */
1349 if (contents == NULL)
1350 {
1351 if (elf_section_data (sec)->this_hdr.contents != NULL)
1352 contents = elf_section_data (sec)->this_hdr.contents;
1353 else
1354 {
1355 contents = (bfd_byte *) bfd_malloc (sec->size);
1356 if (contents == NULL)
1357 goto error_return;
1358 free_contents = contents;
1359
1360 if (!bfd_get_section_contents (abfd, sec, contents,
1361 (file_ptr) 0, sec->size))
1362 goto error_return;
1363 elf_section_data (sec)->this_hdr.contents = contents;
1364 }
1365 }
1366
1367 /* Get the value of the symbol referred to by the reloc. */
1368 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
1369 {
1370 /* A local symbol. */
1371 asection *sym_sec;
1372
1373 isym = isymbuf + ELF32_R_SYM (irel->r_info);
1374 if (isym->st_shndx == SHN_UNDEF)
1375 sym_sec = bfd_und_section_ptr;
1376 else if (isym->st_shndx == SHN_ABS)
1377 sym_sec = bfd_abs_section_ptr;
1378 else if (isym->st_shndx == SHN_COMMON)
1379 sym_sec = bfd_com_section_ptr;
1380 else
1381 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1382
1383 symval = _bfd_elf_rela_local_sym (abfd, isym, &sym_sec, irel);
1384 }
1385 else
1386 {
1387 unsigned long indx;
1388 struct elf_link_hash_entry *h;
1389
1390 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
1391 h = elf_sym_hashes (abfd)[indx];
1392 BFD_ASSERT (h != NULL);
1393
1394 if (h->root.type != bfd_link_hash_defined
1395 && h->root.type != bfd_link_hash_defweak)
1396 /* This appears to be a reference to an undefined
1397 symbol. Just ignore it--it will be caught by the
1398 regular reloc processing. */
1399 continue;
1400
1401 symval = (h->root.u.def.value
1402 + h->root.u.def.section->output_section->vma
1403 + h->root.u.def.section->output_offset);
1404 }
1405
1406 /* If this is a PC-relative reloc, subtract the instr offset from
1407 the symbol value. */
1408 if (ELF32_R_TYPE (irel->r_info) == (int) R_MICROBLAZE_64_PCREL)
1409 {
1410 symval = symval + irel->r_addend
1411 - (irel->r_offset
1412 + sec->output_section->vma
1413 + sec->output_offset);
1414 }
1415 else
1416 symval += irel->r_addend;
1417
1418 if ((symval & 0xffff8000) == 0
1419 || (symval & 0xffff8000) == 0xffff8000)
1420 {
1421 /* We can delete this instruction. */
1422 sec->relax[sec->relax_count].addr = irel->r_offset;
1423 sec->relax[sec->relax_count].size = INST_WORD_SIZE;
1424 sec->relax_count++;
1425
1426 /* Rewrite relocation type. */
1427 switch ((enum elf_microblaze_reloc_type) ELF32_R_TYPE (irel->r_info))
1428 {
1429 case R_MICROBLAZE_64_PCREL:
1430 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1431 (int) R_MICROBLAZE_32_PCREL_LO);
1432 break;
1433 case R_MICROBLAZE_64:
1434 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1435 (int) R_MICROBLAZE_32_LO);
1436 break;
1437 default:
1438 /* Cannot happen. */
1439 BFD_ASSERT (FALSE);
1440 }
1441 }
1442 } /* Loop through all relocations. */
1443
1444 /* Loop through the relocs again, and see if anything needs to change. */
1445 if (sec->relax_count > 0)
1446 {
1447 shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1448 rel_count = 0;
1449 sec->relax[sec->relax_count].addr = sec->size;
1450
1451 for (irel = internal_relocs; irel < irelend; irel++, rel_count++)
1452 {
1453 bfd_vma nraddr;
1454
1455 /* Get the new reloc address. */
1456 nraddr = irel->r_offset - calc_fixup (irel->r_offset, sec);
1457 switch ((enum elf_microblaze_reloc_type) ELF32_R_TYPE (irel->r_info))
1458 {
1459 default:
1460 break;
1461 case R_MICROBLAZE_64_PCREL:
1462 break;
1463 case R_MICROBLAZE_64:
1464 case R_MICROBLAZE_32_LO:
1465 /* If this reloc is against a symbol defined in this
1466 section, we must check the addend to see it will put the value in
1467 range to be adjusted, and hence must be changed. */
1468 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
1469 {
1470 isym = isymbuf + ELF32_R_SYM (irel->r_info);
1471 /* Only handle relocs against .text. */
1472 if (isym->st_shndx == shndx
1473 && ELF32_ST_TYPE (isym->st_info) == STT_SECTION)
1474 irel->r_addend -= calc_fixup (irel->r_addend, sec);
1475 }
1476 break;
1477 case R_MICROBLAZE_NONE:
1478 {
1479 /* This was a PC-relative instruction that was
1480 completely resolved. */
1481 int sfix, efix;
1482 bfd_vma target_address;
1483 target_address = irel->r_addend + irel->r_offset;
1484 sfix = calc_fixup (irel->r_offset, sec);
1485 efix = calc_fixup (target_address, sec);
1486 irel->r_addend -= (efix - sfix);
1487 /* Should use HOWTO. */
1488 bfd_put_16 (abfd, irel->r_addend, contents + irel->r_offset + 2);
1489 }
1490 break;
1491 case R_MICROBLAZE_64_NONE:
1492 {
1493 /* This was a PC-relative 64-bit instruction that was
1494 completely resolved. */
1495 int sfix, efix;
1496 bfd_vma target_address;
1497 target_address = irel->r_addend + irel->r_offset + INST_WORD_SIZE;
1498 sfix = calc_fixup (irel->r_offset + INST_WORD_SIZE, sec);
1499 efix = calc_fixup (target_address, sec);
1500 irel->r_addend -= (efix - sfix);
1501 bfd_put_16 (abfd, irel->r_addend, contents + irel->r_offset
1502 + INST_WORD_SIZE + 2);
1503 }
1504 break;
1505 }
1506 irel->r_offset = nraddr;
1507 } /* Change all relocs in this section. */
1508
1509 /* Look through all other sections. */
1510 for (o = abfd->sections; o != NULL; o = o->next)
1511 {
1512 Elf_Internal_Rela *irelocs;
1513 Elf_Internal_Rela *irelscan, *irelscanend;
1514 bfd_byte *ocontents;
1515
1516 if (o == sec
1517 || (o->flags & SEC_RELOC) == 0
1518 || o->reloc_count == 0)
1519 continue;
1520
1521 /* We always cache the relocs. Perhaps, if info->keep_memory is
1522 FALSE, we should free them, if we are permitted to. */
1523
1524 irelocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL, TRUE);
1525 if (irelocs == NULL)
1526 goto error_return;
1527
1528 ocontents = NULL;
1529 irelscanend = irelocs + o->reloc_count;
1530 for (irelscan = irelocs; irelscan < irelscanend; irelscan++)
1531 {
1532 if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32)
1533 {
1534 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1535
1536 /* Look at the reloc only if the value has been resolved. */
1537 if (isym->st_shndx == shndx
1538 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
1539 {
1540 if (ocontents == NULL)
1541 {
1542 if (elf_section_data (o)->this_hdr.contents != NULL)
1543 ocontents = elf_section_data (o)->this_hdr.contents;
1544 else
1545 {
1546 /* We always cache the section contents.
1547 Perhaps, if info->keep_memory is FALSE, we
1548 should free them, if we are permitted to. */
1549 if (o->rawsize == 0)
1550 o->rawsize = o->size;
1551 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1552 if (ocontents == NULL)
1553 goto error_return;
1554 if (!bfd_get_section_contents (abfd, o, ocontents,
1555 (file_ptr) 0,
1556 o->rawsize))
1557 goto error_return;
1558 elf_section_data (o)->this_hdr.contents = ocontents;
1559 }
1560
1561 }
1562 irelscan->r_addend -= calc_fixup (irelscan->r_addend, sec);
1563 }
1564 else if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_SYM_OP_SYM)
1565 {
1566 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1567
1568 /* Look at the reloc only if the value has been resolved. */
1569 if (ocontents == NULL)
1570 {
1571 if (elf_section_data (o)->this_hdr.contents != NULL)
1572 ocontents = elf_section_data (o)->this_hdr.contents;
1573 else
1574 {
1575 /* We always cache the section contents.
1576 Perhaps, if info->keep_memory is FALSE, we
1577 should free them, if we are permitted to. */
1578
1579 if (o->rawsize == 0)
1580 o->rawsize = o->size;
1581 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1582 if (ocontents == NULL)
1583 goto error_return;
1584 if (!bfd_get_section_contents (abfd, o, ocontents,
1585 (file_ptr) 0,
1586 o->rawsize))
1587 goto error_return;
1588 elf_section_data (o)->this_hdr.contents = ocontents;
1589 }
1590 }
1591 irelscan->r_addend -= calc_fixup (irel->r_addend
1592 + isym->st_value,
1593 sec);
1594 }
1595 }
1596 else if ((ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_PCREL_LO)
1597 || (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_LO))
1598 {
1599 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1600
1601 /* Look at the reloc only if the value has been resolved. */
1602 if (isym->st_shndx == shndx
1603 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
1604 {
1605 bfd_vma immediate;
1606 bfd_vma target_address;
1607
1608 if (ocontents == NULL)
1609 {
1610 if (elf_section_data (o)->this_hdr.contents != NULL)
1611 ocontents = elf_section_data (o)->this_hdr.contents;
1612 else
1613 {
1614 /* We always cache the section contents.
1615 Perhaps, if info->keep_memory is FALSE, we
1616 should free them, if we are permitted to. */
1617 if (o->rawsize == 0)
1618 o->rawsize = o->size;
1619 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1620 if (ocontents == NULL)
1621 goto error_return;
1622 if (!bfd_get_section_contents (abfd, o, ocontents,
1623 (file_ptr) 0,
1624 o->rawsize))
1625 goto error_return;
1626 elf_section_data (o)->this_hdr.contents = ocontents;
1627 }
1628 }
1629
1630 immediate = (unsigned short) bfd_get_16 (abfd, ocontents +
1631 irelscan->r_offset + 2);
1632 target_address = immediate;
1633 offset = calc_fixup (target_address, sec);
1634 immediate -= offset;
1635 irelscan->r_addend -= offset;
1636 bfd_put_16 (abfd, immediate, ocontents + irelscan->r_offset + 2);
1637 }
1638 }
1639
1640 if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_64)
1641 {
1642 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1643
1644 /* Look at the reloc only if the value has been resolved. */
1645 if (isym->st_shndx == shndx
1646 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
1647 {
1648 bfd_vma immediate;
1649
1650 if (ocontents == NULL)
1651 {
1652 if (elf_section_data (o)->this_hdr.contents != NULL)
1653 ocontents = elf_section_data (o)->this_hdr.contents;
1654 else
1655 {
1656 /* We always cache the section contents.
1657 Perhaps, if info->keep_memory is FALSE, we
1658 should free them, if we are permitted to. */
1659
1660 if (o->rawsize == 0)
1661 o->rawsize = o->size;
1662 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1663 if (ocontents == NULL)
1664 goto error_return;
1665 if (!bfd_get_section_contents (abfd, o, ocontents,
1666 (file_ptr) 0,
1667 o->rawsize))
1668 goto error_return;
1669 elf_section_data (o)->this_hdr.contents = ocontents;
1670 }
1671 }
1672 immediate = (unsigned short) (bfd_get_16 (abfd, ocontents
1673 + irelscan->r_offset
1674 + 2) << 16)
1675 & 0xffff0000;
1676 immediate += (unsigned short) (bfd_get_16 (abfd, ocontents
1677 + irelscan->r_offset
1678 + INST_WORD_SIZE + 2))
1679 & 0x0000ffff;
1680
1681 offset = calc_fixup (irelscan->r_addend, sec);
1682 immediate -= offset;
1683 irelscan->r_addend -= offset;
1684 }
1685 }
1686 else if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_64_PCREL)
1687 {
1688 isym = isymbuf + ELF32_R_SYM (irelscan->r_info);
1689
1690 /* Look at the reloc only if the value has been resolved. */
1691 if (isym->st_shndx == shndx
1692 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION))
1693 {
1694 bfd_vma immediate;
1695 bfd_vma target_address;
1696
1697 if (ocontents == NULL)
1698 {
1699 if (elf_section_data (o)->this_hdr.contents != NULL)
1700 ocontents = elf_section_data (o)->this_hdr.contents;
1701 else
1702 {
1703 /* We always cache the section contents.
1704 Perhaps, if info->keep_memory is FALSE, we
1705 should free them, if we are permitted to. */
1706 if (o->rawsize == 0)
1707 o->rawsize = o->size;
1708 ocontents = (bfd_byte *) bfd_malloc (o->rawsize);
1709 if (ocontents == NULL)
1710 goto error_return;
1711 if (!bfd_get_section_contents (abfd, o, ocontents,
1712 (file_ptr) 0,
1713 o->rawsize))
1714 goto error_return;
1715 elf_section_data (o)->this_hdr.contents = ocontents;
1716 }
1717 }
1718
1719 immediate = (unsigned short)
1720 (bfd_get_16 (abfd, ocontents + irelscan->r_offset + 2) << 16)
1721 & 0xffff0000;
1722 immediate += (unsigned short)
1723 (bfd_get_16 (abfd, ocontents + irelscan->r_offset
1724 + INST_WORD_SIZE + 2))
1725 & 0x0000ffff;
1726 target_address = immediate;
1727 offset = calc_fixup (target_address, sec);
1728 immediate -= offset;
1729 irelscan->r_addend -= offset;
1730 bfd_put_16 (abfd, ((immediate >> 16) & 0x0000ffff),
1731 ocontents + irelscan->r_offset + 2);
1732 bfd_put_16 (abfd, (immediate & 0x0000ffff),
1733 ocontents + irelscan->r_offset + INST_WORD_SIZE + 2);
1734 }
1735 }
1736 }
1737 }
1738
1739 /* Adjust the local symbols defined in this section. */
1740 isymend = isymbuf + symtab_hdr->sh_info;
1741 for (isym = isymbuf; isym < isymend; isym++)
1742 {
1743 if (isym->st_shndx == shndx)
1744 isym->st_value =- calc_fixup (isym->st_value, sec);
1745 }
1746
1747 /* Now adjust the global symbols defined in this section. */
1748 isym = isymbuf + symtab_hdr->sh_info;
1749 isymend = isymbuf + (symtab_hdr->sh_size / sizeof (Elf32_External_Sym));
1750 for (sym_index = 0; isym < isymend; isym++, sym_index++)
1751 {
1752 sym_hash = elf_sym_hashes (abfd)[sym_index];
1753 if (isym->st_shndx == shndx
1754 && (sym_hash->root.type == bfd_link_hash_defined
1755 || sym_hash->root.type == bfd_link_hash_defweak)
1756 && sym_hash->root.u.def.section == sec)
1757 {
1758 sym_hash->root.u.def.value -= calc_fixup (sym_hash->root.u.def.value,
1759 sec);
1760 }
1761 }
1762
1763 /* Physically move the code and change the cooked size. */
1764 dest = sec->relax[0].addr;
1765 for (i = 0; i < sec->relax_count; i++)
1766 {
1767 int len;
1768 src = sec->relax[i].addr + sec->relax[i].size;
1769 len = sec->relax[i+1].addr - sec->relax[i].addr - sec->relax[i].size;
1770
1771 memmove (contents + dest, contents + src, len);
1772 sec->size -= sec->relax[i].size;
1773 dest += len;
1774 }
1775
1776 elf_section_data (sec)->relocs = internal_relocs;
1777 free_relocs = NULL;
1778
1779 elf_section_data (sec)->this_hdr.contents = contents;
1780 free_contents = NULL;
1781
1782 symtab_hdr->contents = (bfd_byte *) isymbuf;
1783 }
1784
1785 if (free_relocs != NULL)
1786 {
1787 free (free_relocs);
1788 free_relocs = NULL;
1789 }
1790
1791 if (free_contents != NULL)
1792 {
1793 if (!link_info->keep_memory)
1794 free (free_contents);
1795 else
1796 /* Cache the section contents for elf_link_input_bfd. */
1797 elf_section_data (sec)->this_hdr.contents = contents;
1798 free_contents = NULL;
1799 }
1800
1801 if (sec->relax_count == 0)
1802 {
1803 free (sec->relax);
1804 sec->relax = NULL;
1805 }
1806 return TRUE;
1807
1808 error_return:
1809 if (free_relocs != NULL)
1810 free (free_relocs);
1811 if (free_contents != NULL)
1812 free (free_contents);
1813 if (sec->relax != NULL)
1814 {
1815 free (sec->relax);
1816 sec->relax = NULL;
1817 sec->relax_count = 0;
1818 }
1819 return FALSE;
1820 }
1821
1822 /* Return the section that should be marked against GC for a given
1823 relocation. */
1824
1825 static asection *
1826 microblaze_elf_gc_mark_hook (asection *sec,
1827 struct bfd_link_info * info,
1828 Elf_Internal_Rela * rel,
1829 struct elf_link_hash_entry * h,
1830 Elf_Internal_Sym * sym)
1831 {
1832 if (h != NULL)
1833 switch (ELF32_R_TYPE (rel->r_info))
1834 {
1835 case R_MICROBLAZE_GNU_VTINHERIT:
1836 case R_MICROBLAZE_GNU_VTENTRY:
1837 return NULL;
1838 }
1839
1840 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1841 }
1842
1843 /* Update the got entry reference counts for the section being removed. */
1844
1845 static bfd_boolean
1846 microblaze_elf_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
1847 struct bfd_link_info * info ATTRIBUTE_UNUSED,
1848 asection * sec ATTRIBUTE_UNUSED,
1849 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
1850 {
1851 return TRUE;
1852 }
1853
1854 /* PIC support. */
1855
1856 #define PLT_ENTRY_SIZE 16
1857
1858 #define PLT_ENTRY_WORD_0 0xb0000000 /* "imm 0". */
1859 #define PLT_ENTRY_WORD_1 0xe9940000 /* "lwi r12,r20,0" - relocated to lwi r12,r20,func@GOT. */
1860 #define PLT_ENTRY_WORD_1_NOPIC 0xe9800000 /* "lwi r12,r0,0" - non-PIC object. */
1861 #define PLT_ENTRY_WORD_2 0x98186000 /* "brad r12". */
1862 #define PLT_ENTRY_WORD_3 0x80000000 /* "nop". */
1863
1864 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
1865 shortcuts to them in our hash table. */
1866
1867 static bfd_boolean
1868 create_got_section (bfd *dynobj, struct bfd_link_info *info)
1869 {
1870 struct elf32_mb_link_hash_table *htab;
1871
1872 if (! _bfd_elf_create_got_section (dynobj, info))
1873 return FALSE;
1874 htab = elf32_mb_hash_table (info);
1875 if (htab == NULL)
1876 return FALSE;
1877
1878 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
1879 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1880 if (!htab->sgot || !htab->sgotplt)
1881 return FALSE;
1882
1883 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
1884 if (htab->srelgot == NULL
1885 || ! bfd_set_section_flags (dynobj, htab->srelgot, SEC_ALLOC
1886 | SEC_LOAD
1887 | SEC_HAS_CONTENTS
1888 | SEC_IN_MEMORY
1889 | SEC_LINKER_CREATED
1890 | SEC_READONLY)
1891 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
1892 return FALSE;
1893 return TRUE;
1894 }
1895
1896 /* Look through the relocs for a section during the first phase. */
1897
1898 static bfd_boolean
1899 microblaze_elf_check_relocs (bfd * abfd,
1900 struct bfd_link_info * info,
1901 asection * sec,
1902 const Elf_Internal_Rela * relocs)
1903 {
1904 Elf_Internal_Shdr * symtab_hdr;
1905 struct elf_link_hash_entry ** sym_hashes;
1906 struct elf_link_hash_entry ** sym_hashes_end;
1907 const Elf_Internal_Rela * rel;
1908 const Elf_Internal_Rela * rel_end;
1909 struct elf32_mb_link_hash_table *htab;
1910 bfd_vma *local_got_offsets;
1911 asection *sreloc = NULL;
1912
1913 if (info->relocatable)
1914 return TRUE;
1915
1916 htab = elf32_mb_hash_table (info);
1917 if (htab == NULL)
1918 return FALSE;
1919
1920 local_got_offsets = elf_local_got_offsets (abfd);
1921 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
1922 sym_hashes = elf_sym_hashes (abfd);
1923 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
1924 if (!elf_bad_symtab (abfd))
1925 sym_hashes_end -= symtab_hdr->sh_info;
1926
1927 rel_end = relocs + sec->reloc_count;
1928
1929 for (rel = relocs; rel < rel_end; rel++)
1930 {
1931 unsigned int r_type;
1932 struct elf_link_hash_entry * h;
1933 unsigned long r_symndx;
1934
1935 r_symndx = ELF32_R_SYM (rel->r_info);
1936 r_type = ELF32_R_TYPE (rel->r_info);
1937
1938 if (r_symndx < symtab_hdr->sh_info)
1939 h = NULL;
1940 else
1941 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
1942
1943 switch (r_type)
1944 {
1945 /* This relocation describes the C++ object vtable hierarchy.
1946 Reconstruct it for later use during GC. */
1947 case R_MICROBLAZE_GNU_VTINHERIT:
1948 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1949 return FALSE;
1950 break;
1951
1952 /* This relocation describes which C++ vtable entries are actually
1953 used. Record for later use during GC. */
1954 case R_MICROBLAZE_GNU_VTENTRY:
1955 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1956 return FALSE;
1957 break;
1958
1959 /* This relocation requires .plt entry. */
1960 case R_MICROBLAZE_PLT_64:
1961 if (h != NULL)
1962 {
1963 h->needs_plt = 1;
1964 h->plt.refcount += 1;
1965 }
1966 break;
1967
1968 /* This relocation requires .got entry. */
1969 case R_MICROBLAZE_GOT_64:
1970 if (htab->sgot == NULL)
1971 {
1972 if (htab->elf.dynobj == NULL)
1973 htab->elf.dynobj = abfd;
1974 if (!create_got_section (htab->elf.dynobj, info))
1975 return FALSE;
1976 }
1977 if (h != NULL)
1978 {
1979 h->got.refcount += 1;
1980 }
1981 else
1982 {
1983 bfd_signed_vma *local_got_refcounts;
1984
1985 /* This is a global offset table entry for a local symbol. */
1986 local_got_refcounts = elf_local_got_refcounts (abfd);
1987 if (local_got_refcounts == NULL)
1988 {
1989 bfd_size_type size;
1990
1991 size = symtab_hdr->sh_info;
1992 size *= sizeof (bfd_signed_vma);
1993 local_got_refcounts = bfd_zalloc (abfd, size);
1994 if (local_got_refcounts == NULL)
1995 return FALSE;
1996 elf_local_got_refcounts (abfd) = local_got_refcounts;
1997 }
1998 local_got_refcounts[r_symndx] += 1;
1999 }
2000 break;
2001
2002 case R_MICROBLAZE_64:
2003 case R_MICROBLAZE_64_PCREL:
2004 case R_MICROBLAZE_32:
2005 {
2006 if (h != NULL && !info->shared)
2007 {
2008 /* we may need a copy reloc. */
2009 h->non_got_ref = 1;
2010
2011 /* we may also need a .plt entry. */
2012 h->plt.refcount += 1;
2013 if (ELF32_R_TYPE (rel->r_info) != R_MICROBLAZE_64_PCREL)
2014 h->pointer_equality_needed = 1;
2015 }
2016
2017
2018 /* If we are creating a shared library, and this is a reloc
2019 against a global symbol, or a non PC relative reloc
2020 against a local symbol, then we need to copy the reloc
2021 into the shared library. However, if we are linking with
2022 -Bsymbolic, we do not need to copy a reloc against a
2023 global symbol which is defined in an object we are
2024 including in the link (i.e., DEF_REGULAR is set). At
2025 this point we have not seen all the input files, so it is
2026 possible that DEF_REGULAR is not set now but will be set
2027 later (it is never cleared). In case of a weak definition,
2028 DEF_REGULAR may be cleared later by a strong definition in
2029 a shared library. We account for that possibility below by
2030 storing information in the relocs_copied field of the hash
2031 table entry. A similar situation occurs when creating
2032 shared libraries and symbol visibility changes render the
2033 symbol local.
2034
2035 If on the other hand, we are creating an executable, we
2036 may need to keep relocations for symbols satisfied by a
2037 dynamic library if we manage to avoid copy relocs for the
2038 symbol. */
2039
2040 if ((info->shared
2041 && (sec->flags & SEC_ALLOC) != 0
2042 && (r_type != R_MICROBLAZE_64_PCREL
2043 || (h != NULL
2044 && (! info->symbolic
2045 || h->root.type == bfd_link_hash_defweak
2046 || !h->def_regular))))
2047 || (!info->shared
2048 && (sec->flags & SEC_ALLOC) != 0
2049 && h != NULL
2050 && (h->root.type == bfd_link_hash_defweak
2051 || !h->def_regular)))
2052 {
2053 struct elf32_mb_dyn_relocs *p;
2054 struct elf32_mb_dyn_relocs **head;
2055
2056 /* When creating a shared object, we must copy these
2057 relocs into the output file. We create a reloc
2058 section in dynobj and make room for the reloc. */
2059
2060 if (sreloc == NULL)
2061 {
2062 const char *name;
2063 bfd *dynobj;
2064 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
2065 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
2066
2067 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
2068 if (name == NULL)
2069 return FALSE;
2070
2071 if (strncmp (name, ".rela", 5) != 0
2072 || strcmp (bfd_get_section_name (abfd, sec),
2073 name + 5) != 0)
2074 {
2075 (*_bfd_error_handler)
2076 (_("%B: bad relocation section name `%s\'"),
2077 abfd, name);
2078 }
2079
2080 if (htab->elf.dynobj == NULL)
2081 htab->elf.dynobj = abfd;
2082 dynobj = htab->elf.dynobj;
2083
2084 sreloc = bfd_get_section_by_name (dynobj, name);
2085 if (sreloc == NULL)
2086 {
2087 flagword flags;
2088
2089 sreloc = bfd_make_section (dynobj, name);
2090 flags = (SEC_HAS_CONTENTS | SEC_READONLY
2091 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2092 if ((sec->flags & SEC_ALLOC) != 0)
2093 flags |= SEC_ALLOC | SEC_LOAD;
2094 if (sreloc == NULL
2095 || ! bfd_set_section_flags (dynobj, sreloc, flags)
2096 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
2097 return FALSE;
2098 }
2099 elf_section_data (sec)->sreloc = sreloc;
2100 }
2101
2102 /* If this is a global symbol, we count the number of
2103 relocations we need for this symbol. */
2104 if (h != NULL)
2105 head = &((struct elf32_mb_link_hash_entry *) h)->dyn_relocs;
2106 else
2107 {
2108 /* Track dynamic relocs needed for local syms too.
2109 We really need local syms available to do this
2110 easily. Oh well. */
2111
2112 asection *s;
2113 Elf_Internal_Sym *isym;
2114 void *vpp;
2115
2116 isym = bfd_sym_from_r_symndx (&htab->sym_sec,
2117 abfd, r_symndx);
2118 if (isym == NULL)
2119 return FALSE;
2120
2121 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2122 if (s == NULL)
2123 return FALSE;
2124
2125 vpp = &elf_section_data (s)->local_dynrel;
2126 head = (struct elf32_mb_dyn_relocs **) vpp;
2127 }
2128
2129 p = *head;
2130 if (p == NULL || p->sec != sec)
2131 {
2132 bfd_size_type amt = sizeof *p;
2133 p = ((struct elf32_mb_dyn_relocs *)
2134 bfd_alloc (htab->elf.dynobj, amt));
2135 if (p == NULL)
2136 return FALSE;
2137 p->next = *head;
2138 *head = p;
2139 p->sec = sec;
2140 p->count = 0;
2141 p->pc_count = 0;
2142 }
2143
2144 p->count += 1;
2145 if (r_type == R_MICROBLAZE_64_PCREL)
2146 p->pc_count += 1;
2147 }
2148 }
2149 break;
2150 }
2151 }
2152
2153 return TRUE;
2154 }
2155
2156 static bfd_boolean
2157 microblaze_elf_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
2158 {
2159 struct elf32_mb_link_hash_table *htab;
2160
2161 htab = elf32_mb_hash_table (info);
2162 if (htab == NULL)
2163 return FALSE;
2164
2165 if (!htab->sgot && !create_got_section (dynobj, info))
2166 return FALSE;
2167
2168 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
2169 return FALSE;
2170
2171 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
2172 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
2173 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
2174 if (!info->shared)
2175 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
2176
2177 if (!htab->splt || !htab->srelplt || !htab->sdynbss
2178 || (!info->shared && !htab->srelbss))
2179 abort ();
2180
2181 return TRUE;
2182 }
2183
2184 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2185
2186 static void
2187 microblaze_elf_copy_indirect_symbol (struct bfd_link_info *info,
2188 struct elf_link_hash_entry *dir,
2189 struct elf_link_hash_entry *ind)
2190 {
2191 struct elf32_mb_link_hash_entry *edir, *eind;
2192
2193 edir = (struct elf32_mb_link_hash_entry *) dir;
2194 eind = (struct elf32_mb_link_hash_entry *) ind;
2195
2196 if (eind->dyn_relocs != NULL)
2197 {
2198 if (edir->dyn_relocs != NULL)
2199 {
2200 struct elf32_mb_dyn_relocs **pp;
2201 struct elf32_mb_dyn_relocs *p;
2202
2203 if (ind->root.type == bfd_link_hash_indirect)
2204 abort ();
2205
2206 /* Add reloc counts against the weak sym to the strong sym
2207 list. Merge any entries against the same section. */
2208 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
2209 {
2210 struct elf32_mb_dyn_relocs *q;
2211
2212 for (q = edir->dyn_relocs; q != NULL; q = q->next)
2213 if (q->sec == p->sec)
2214 {
2215 q->pc_count += p->pc_count;
2216 q->count += p->count;
2217 *pp = p->next;
2218 break;
2219 }
2220 if (q == NULL)
2221 pp = &p->next;
2222 }
2223 *pp = edir->dyn_relocs;
2224 }
2225
2226 edir->dyn_relocs = eind->dyn_relocs;
2227 eind->dyn_relocs = NULL;
2228 }
2229
2230 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
2231 }
2232
2233 static bfd_boolean
2234 microblaze_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
2235 struct elf_link_hash_entry *h)
2236 {
2237 struct elf32_mb_link_hash_table *htab;
2238 struct elf32_mb_link_hash_entry * eh;
2239 struct elf32_mb_dyn_relocs *p;
2240 asection *sdynbss, *s;
2241 unsigned int power_of_two;
2242 bfd *dynobj;
2243
2244 htab = elf32_mb_hash_table (info);
2245 if (htab == NULL)
2246 return FALSE;
2247
2248 /* If this is a function, put it in the procedure linkage table. We
2249 will fill in the contents of the procedure linkage table later,
2250 when we know the address of the .got section. */
2251 if (h->type == STT_FUNC
2252 || h->needs_plt)
2253 {
2254 if (h->plt.refcount <= 0
2255 || SYMBOL_CALLS_LOCAL (info, h)
2256 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2257 && h->root.type == bfd_link_hash_undefweak))
2258 {
2259 /* This case can occur if we saw a PLT reloc in an input
2260 file, but the symbol was never referred to by a dynamic
2261 object, or if all references were garbage collected. In
2262 such a case, we don't actually need to build a procedure
2263 linkage table, and we can just do a PC32 reloc instead. */
2264 h->plt.offset = (bfd_vma) -1;
2265 h->needs_plt = 0;
2266 }
2267
2268 return TRUE;
2269 }
2270 else
2271 /* It's possible that we incorrectly decided a .plt reloc was
2272 needed for an R_MICROBLAZE_64_PCREL reloc to a non-function sym in
2273 check_relocs. We can't decide accurately between function and
2274 non-function syms in check-relocs; Objects loaded later in
2275 the link may change h->type. So fix it now. */
2276 h->plt.offset = (bfd_vma) -1;
2277
2278 /* If this is a weak symbol, and there is a real definition, the
2279 processor independent code will have arranged for us to see the
2280 real definition first, and we can just use the same value. */
2281 if (h->u.weakdef != NULL)
2282 {
2283 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2284 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2285 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2286 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2287 return TRUE;
2288 }
2289
2290 /* This is a reference to a symbol defined by a dynamic object which
2291 is not a function. */
2292
2293 /* If we are creating a shared library, we must presume that the
2294 only references to the symbol are via the global offset table.
2295 For such cases we need not do anything here; the relocations will
2296 be handled correctly by relocate_section. */
2297 if (info->shared)
2298 return TRUE;
2299
2300 /* If there are no references to this symbol that do not use the
2301 GOT, we don't need to generate a copy reloc. */
2302 if (!h->non_got_ref)
2303 return TRUE;
2304
2305 /* If -z nocopyreloc was given, we won't generate them either. */
2306 if (info->nocopyreloc)
2307 {
2308 h->non_got_ref = 0;
2309 return TRUE;
2310 }
2311
2312 eh = (struct elf32_mb_link_hash_entry *) h;
2313 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2314 {
2315 s = p->sec->output_section;
2316 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2317 break;
2318 }
2319
2320 /* If we didn't find any dynamic relocs in read-only sections, then
2321 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2322 if (p == NULL)
2323 {
2324 h->non_got_ref = 0;
2325 return TRUE;
2326 }
2327
2328 /* We must allocate the symbol in our .dynbss section, which will
2329 become part of the .bss section of the executable. There will be
2330 an entry for this symbol in the .dynsym section. The dynamic
2331 object will contain position independent code, so all references
2332 from the dynamic object to this symbol will go through the global
2333 offset table. The dynamic linker will use the .dynsym entry to
2334 determine the address it must put in the global offset table, so
2335 both the dynamic object and the regular object will refer to the
2336 same memory location for the variable. */
2337
2338 /* We must generate a R_MICROBLAZE_COPY reloc to tell the dynamic linker
2339 to copy the initial value out of the dynamic object and into the
2340 runtime process image. */
2341 dynobj = elf_hash_table (info)->dynobj;
2342 BFD_ASSERT (dynobj != NULL);
2343 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2344 {
2345 htab->srelbss->size += sizeof (Elf32_External_Rela);
2346 h->needs_copy = 1;
2347 }
2348
2349 /* We need to figure out the alignment required for this symbol. I
2350 have no idea how ELF linkers handle this. */
2351 power_of_two = bfd_log2 (h->size);
2352 if (power_of_two > 3)
2353 power_of_two = 3;
2354
2355 sdynbss = htab->sdynbss;
2356 /* Apply the required alignment. */
2357 sdynbss->size = BFD_ALIGN (sdynbss->size, (bfd_size_type) (1 << power_of_two));
2358 if (power_of_two > bfd_get_section_alignment (dynobj, sdynbss))
2359 {
2360 if (! bfd_set_section_alignment (dynobj, sdynbss, power_of_two))
2361 return FALSE;
2362 }
2363
2364 /* Define the symbol as being at this point in the section. */
2365 h->root.u.def.section = sdynbss;
2366 h->root.u.def.value = sdynbss->size;
2367
2368 /* Increment the section size to make room for the symbol. */
2369 sdynbss->size += h->size;
2370 return TRUE;
2371 }
2372
2373 /* Allocate space in .plt, .got and associated reloc sections for
2374 dynamic relocs. */
2375
2376 static bfd_boolean
2377 allocate_dynrelocs (struct elf_link_hash_entry *h, void * dat)
2378 {
2379 struct bfd_link_info *info;
2380 struct elf32_mb_link_hash_table *htab;
2381 struct elf32_mb_link_hash_entry *eh;
2382 struct elf32_mb_dyn_relocs *p;
2383
2384 if (h->root.type == bfd_link_hash_indirect)
2385 return TRUE;
2386
2387 if (h->root.type == bfd_link_hash_warning)
2388 /* When warning symbols are created, they **replace** the "real"
2389 entry in the hash table, thus we never get to see the real
2390 symbol in a hash traversal. So look at it now. */
2391 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2392
2393 info = (struct bfd_link_info *) dat;
2394 htab = elf32_mb_hash_table (info);
2395 if (htab == NULL)
2396 return FALSE;
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 if (htab == NULL)
2560 return FALSE;
2561
2562 dynobj = htab->elf.dynobj;
2563 BFD_ASSERT (dynobj != NULL);
2564
2565 /* Set up .got offsets for local syms, and space for local dynamic
2566 relocs. */
2567 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2568 {
2569 bfd_signed_vma *local_got;
2570 bfd_signed_vma *end_local_got;
2571 bfd_size_type locsymcount;
2572 Elf_Internal_Shdr *symtab_hdr;
2573 asection *srel;
2574
2575 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2576 continue;
2577
2578 for (s = ibfd->sections; s != NULL; s = s->next)
2579 {
2580 struct elf32_mb_dyn_relocs *p;
2581
2582 for (p = ((struct elf32_mb_dyn_relocs *)
2583 elf_section_data (s)->local_dynrel);
2584 p != NULL;
2585 p = p->next)
2586 {
2587 if (!bfd_is_abs_section (p->sec)
2588 && bfd_is_abs_section (p->sec->output_section))
2589 {
2590 /* Input section has been discarded, either because
2591 it is a copy of a linkonce section or due to
2592 linker script /DISCARD/, so we'll be discarding
2593 the relocs too. */
2594 }
2595 else if (p->count != 0)
2596 {
2597 srel = elf_section_data (p->sec)->sreloc;
2598 srel->size += p->count * sizeof (Elf32_External_Rela);
2599 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2600 info->flags |= DF_TEXTREL;
2601 }
2602 }
2603 }
2604
2605 local_got = elf_local_got_refcounts (ibfd);
2606 if (!local_got)
2607 continue;
2608
2609 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2610 locsymcount = symtab_hdr->sh_info;
2611 end_local_got = local_got + locsymcount;
2612 s = htab->sgot;
2613 srel = htab->srelgot;
2614
2615 for (; local_got < end_local_got; ++local_got)
2616 {
2617 if (*local_got > 0)
2618 {
2619 *local_got = s->size;
2620 s->size += 4;
2621 if (info->shared)
2622 srel->size += sizeof (Elf32_External_Rela);
2623 }
2624 else
2625 *local_got = (bfd_vma) -1;
2626 }
2627 }
2628
2629 /* Allocate global sym .plt and .got entries, and space for global
2630 sym dynamic relocs. */
2631 elf_link_hash_traverse (elf_hash_table (info), allocate_dynrelocs, info);
2632
2633 if (elf_hash_table (info)->dynamic_sections_created)
2634 {
2635 /* Make space for the trailing nop in .plt. */
2636 if (htab->splt->size > 0)
2637 htab->splt->size += 4;
2638 }
2639
2640 /* The check_relocs and adjust_dynamic_symbol entry points have
2641 determined the sizes of the various dynamic sections. Allocate
2642 memory for them. */
2643 for (s = dynobj->sections; s != NULL; s = s->next)
2644 {
2645 const char *name;
2646 bfd_boolean strip = FALSE;
2647
2648 if ((s->flags & SEC_LINKER_CREATED) == 0)
2649 continue;
2650
2651 /* It's OK to base decisions on the section name, because none
2652 of the dynobj section names depend upon the input files. */
2653 name = bfd_get_section_name (dynobj, s);
2654
2655 if (strncmp (name, ".rela", 5) == 0)
2656 {
2657 if (s->size == 0)
2658 {
2659 /* If we don't need this section, strip it from the
2660 output file. This is to handle .rela.bss and
2661 .rela.plt. We must create it in
2662 create_dynamic_sections, because it must be created
2663 before the linker maps input sections to output
2664 sections. The linker does that before
2665 adjust_dynamic_symbol is called, and it is that
2666 function which decides whether anything needs to go
2667 into these sections. */
2668 strip = TRUE;
2669 }
2670 else
2671 {
2672 /* We use the reloc_count field as a counter if we need
2673 to copy relocs into the output file. */
2674 s->reloc_count = 0;
2675 }
2676 }
2677 else if (s != htab->splt && s != htab->sgot && s != htab->sgotplt)
2678 {
2679 /* It's not one of our sections, so don't allocate space. */
2680 continue;
2681 }
2682
2683 if (strip)
2684 {
2685 s->flags |= SEC_EXCLUDE;
2686 continue;
2687 }
2688
2689 /* Allocate memory for the section contents. */
2690 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
2691 Unused entries should be reclaimed before the section's contents
2692 are written out, but at the moment this does not happen. Thus in
2693 order to prevent writing out garbage, we initialise the section's
2694 contents to zero. */
2695 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2696 if (s->contents == NULL && s->size != 0)
2697 return FALSE;
2698 }
2699
2700 if (elf_hash_table (info)->dynamic_sections_created)
2701 {
2702 /* Add some entries to the .dynamic section. We fill in the
2703 values later, in microblaze_elf_finish_dynamic_sections, but we
2704 must add the entries now so that we get the correct size for
2705 the .dynamic section. The DT_DEBUG entry is filled in by the
2706 dynamic linker and used by the debugger. */
2707 #define add_dynamic_entry(TAG, VAL) \
2708 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2709
2710 if (info->executable)
2711 {
2712 if (!add_dynamic_entry (DT_DEBUG, 0))
2713 return FALSE;
2714 }
2715
2716 if (!add_dynamic_entry (DT_RELA, 0)
2717 || !add_dynamic_entry (DT_RELASZ, 0)
2718 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2719 return FALSE;
2720
2721 if (htab->splt->size != 0)
2722 {
2723 if (!add_dynamic_entry (DT_PLTGOT, 0)
2724 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2725 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2726 || !add_dynamic_entry (DT_JMPREL, 0)
2727 || !add_dynamic_entry (DT_BIND_NOW, 1))
2728 return FALSE;
2729 }
2730
2731 if (info->flags & DF_TEXTREL)
2732 {
2733 if (!add_dynamic_entry (DT_TEXTREL, 0))
2734 return FALSE;
2735 }
2736 }
2737 #undef add_dynamic_entry
2738 return TRUE;
2739 }
2740
2741 /* Finish up dynamic symbol handling. We set the contents of various
2742 dynamic sections here. */
2743
2744 static bfd_boolean
2745 microblaze_elf_finish_dynamic_symbol (bfd *output_bfd,
2746 struct bfd_link_info *info,
2747 struct elf_link_hash_entry *h,
2748 Elf_Internal_Sym *sym)
2749 {
2750 bfd *dynobj;
2751 struct elf32_mb_link_hash_table *htab;
2752
2753 htab = elf32_mb_hash_table (info);
2754 if (htab == NULL)
2755 return FALSE;
2756
2757 dynobj = htab->elf.dynobj;
2758
2759 if (h->plt.offset != (bfd_vma) -1)
2760 {
2761 asection *splt;
2762 asection *srela;
2763 asection *sgotplt;
2764 Elf_Internal_Rela rela;
2765 bfd_byte *loc;
2766 bfd_vma plt_index;
2767 bfd_vma got_offset;
2768 bfd_vma got_addr;
2769
2770 /* This symbol has an entry in the procedure linkage table. Set
2771 it up. */
2772 BFD_ASSERT (h->dynindx != -1);
2773
2774 splt = htab->splt;
2775 srela = htab->srelplt;
2776 sgotplt = htab->sgotplt;
2777 BFD_ASSERT (splt != NULL && srela != NULL && sgotplt != NULL);
2778
2779 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; /* first entry reserved. */
2780 got_offset = (plt_index + 3) * 4; /* 3 reserved ??? */
2781 got_addr = got_offset;
2782
2783 /* For non-PIC objects we need absolute address of the GOT entry. */
2784 if (!info->shared)
2785 got_addr += htab->sgotplt->output_section->vma + sgotplt->output_offset;
2786
2787 /* Fill in the entry in the procedure linkage table. */
2788 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_0 + ((got_addr >> 16) & 0xffff),
2789 splt->contents + h->plt.offset);
2790 if (info->shared)
2791 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_1 + (got_addr & 0xffff),
2792 splt->contents + h->plt.offset + 4);
2793 else
2794 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_1_NOPIC + (got_addr & 0xffff),
2795 splt->contents + h->plt.offset + 4);
2796 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD_2,
2797 splt->contents + h->plt.offset + 8);
2798 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD_3,
2799 splt->contents + h->plt.offset + 12);
2800
2801 /* Any additions to the .got section??? */
2802 /* bfd_put_32 (output_bfd,
2803 splt->output_section->vma + splt->output_offset + h->plt.offset + 4,
2804 sgotplt->contents + got_offset); */
2805
2806 /* Fill in the entry in the .rela.plt section. */
2807 rela.r_offset = (sgotplt->output_section->vma
2808 + sgotplt->output_offset
2809 + got_offset);
2810 rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_JUMP_SLOT);
2811 rela.r_addend = 0;
2812 loc = srela->contents;
2813 loc += plt_index * sizeof (Elf32_External_Rela);
2814 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
2815
2816 if (!h->def_regular)
2817 {
2818 /* Mark the symbol as undefined, rather than as defined in
2819 the .plt section. Zero the value. */
2820 sym->st_shndx = SHN_UNDEF;
2821 sym->st_value = 0;
2822 }
2823 }
2824
2825 if (h->got.offset != (bfd_vma) -1)
2826 {
2827 asection *sgot;
2828 asection *srela;
2829 Elf_Internal_Rela rela;
2830 bfd_byte *loc;
2831
2832 /* This symbol has an entry in the global offset table. Set it
2833 up. */
2834
2835 sgot = htab->sgot;
2836 srela = htab->srelgot;
2837 BFD_ASSERT (sgot != NULL && srela != NULL);
2838
2839 rela.r_offset = (sgot->output_section->vma
2840 + sgot->output_offset
2841 + (h->got.offset &~ (bfd_vma) 1));
2842
2843 /* If this is a -Bsymbolic link, and the symbol is defined
2844 locally, we just want to emit a RELATIVE reloc. Likewise if
2845 the symbol was forced to be local because of a version file.
2846 The entry in the global offset table will already have been
2847 initialized in the relocate_section function. */
2848 if (info->shared
2849 && (info->symbolic || h->dynindx == -1)
2850 && h->def_regular)
2851 {
2852 asection *sec = h->root.u.def.section;
2853 rela.r_info = ELF32_R_INFO (0, R_MICROBLAZE_REL);
2854 rela.r_addend = (h->root.u.def.value
2855 + sec->output_section->vma
2856 + sec->output_offset);
2857 }
2858 else
2859 {
2860 rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_GLOB_DAT);
2861 rela.r_addend = 0;
2862 }
2863
2864 bfd_put_32 (output_bfd, (bfd_vma) 0,
2865 sgot->contents + (h->got.offset &~ (bfd_vma) 1));
2866 loc = srela->contents;
2867 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
2868 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
2869 }
2870
2871 if (h->needs_copy)
2872 {
2873 asection *s;
2874 Elf_Internal_Rela rela;
2875 bfd_byte *loc;
2876
2877 /* This symbols needs a copy reloc. Set it up. */
2878
2879 BFD_ASSERT (h->dynindx != -1);
2880
2881 s = bfd_get_section_by_name (h->root.u.def.section->owner,
2882 ".rela.bss");
2883 BFD_ASSERT (s != NULL);
2884
2885 rela.r_offset = (h->root.u.def.value
2886 + h->root.u.def.section->output_section->vma
2887 + h->root.u.def.section->output_offset);
2888 rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_COPY);
2889 rela.r_addend = 0;
2890 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
2891 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
2892 }
2893
2894 /* Mark some specially defined symbols as absolute. */
2895 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2896 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2897 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
2898 sym->st_shndx = SHN_ABS;
2899
2900 return TRUE;
2901 }
2902
2903
2904 /* Finish up the dynamic sections. */
2905
2906 static bfd_boolean
2907 microblaze_elf_finish_dynamic_sections (bfd *output_bfd,
2908 struct bfd_link_info *info)
2909 {
2910 bfd *dynobj;
2911 asection *sdyn, *sgot;
2912 struct elf32_mb_link_hash_table *htab;
2913
2914 htab = elf32_mb_hash_table (info);
2915 if (htab == NULL)
2916 return FALSE;
2917
2918 dynobj = htab->elf.dynobj;
2919
2920 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2921
2922 if (htab->elf.dynamic_sections_created)
2923 {
2924 asection *splt;
2925 Elf32_External_Dyn *dyncon, *dynconend;
2926
2927 splt = bfd_get_section_by_name (dynobj, ".plt");
2928 BFD_ASSERT (splt != NULL && sdyn != NULL);
2929
2930 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2931 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2932 for (; dyncon < dynconend; dyncon++)
2933 {
2934 Elf_Internal_Dyn dyn;
2935 const char *name;
2936 bfd_boolean size;
2937
2938 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2939
2940 switch (dyn.d_tag)
2941 {
2942 case DT_PLTGOT: name = ".got.plt"; size = FALSE; break;
2943 case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break;
2944 case DT_JMPREL: name = ".rela.plt"; size = FALSE; break;
2945 case DT_RELA: name = ".rela.dyn"; size = FALSE; break;
2946 case DT_RELASZ: name = ".rela.dyn"; size = TRUE; break;
2947 default: name = NULL; size = FALSE; break;
2948 }
2949
2950 if (name != NULL)
2951 {
2952 asection *s;
2953
2954 s = bfd_get_section_by_name (output_bfd, name);
2955 if (s == NULL)
2956 dyn.d_un.d_val = 0;
2957 else
2958 {
2959 if (! size)
2960 dyn.d_un.d_ptr = s->vma;
2961 else
2962 dyn.d_un.d_val = s->size;
2963 }
2964 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2965 }
2966 }
2967
2968 /* Clear the first entry in the procedure linkage table,
2969 and put a nop in the last four bytes. */
2970 if (splt->size > 0)
2971 {
2972 memset (splt->contents, 0, PLT_ENTRY_SIZE);
2973 bfd_put_32 (output_bfd, (bfd_vma) 0x80000000 /* nop. */,
2974 splt->contents + splt->size - 4);
2975 }
2976
2977 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
2978 }
2979
2980 /* Set the first entry in the global offset table to the address of
2981 the dynamic section. */
2982 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2983 if (sgot && sgot->size > 0)
2984 {
2985 if (sdyn == NULL)
2986 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2987 else
2988 bfd_put_32 (output_bfd,
2989 sdyn->output_section->vma + sdyn->output_offset,
2990 sgot->contents);
2991 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2992 }
2993
2994 if (htab->sgot && htab->sgot->size > 0)
2995 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
2996
2997 return TRUE;
2998 }
2999
3000 /* Hook called by the linker routine which adds symbols from an object
3001 file. We use it to put .comm items in .sbss, and not .bss. */
3002
3003 static bfd_boolean
3004 microblaze_elf_add_symbol_hook (bfd *abfd,
3005 struct bfd_link_info *info,
3006 Elf_Internal_Sym *sym,
3007 const char **namep ATTRIBUTE_UNUSED,
3008 flagword *flagsp ATTRIBUTE_UNUSED,
3009 asection **secp,
3010 bfd_vma *valp)
3011 {
3012 if (sym->st_shndx == SHN_COMMON
3013 && !info->relocatable
3014 && sym->st_size <= elf_gp_size (abfd))
3015 {
3016 /* Common symbols less than or equal to -G nn bytes are automatically
3017 put into .sbss. */
3018 *secp = bfd_make_section_anyway (abfd, ".sbss");
3019 if (*secp == NULL
3020 || ! bfd_set_section_flags (abfd, *secp, SEC_IS_COMMON))
3021 return FALSE;
3022
3023 *valp = sym->st_size;
3024 }
3025
3026 return TRUE;
3027 }
3028
3029
3030 #define TARGET_BIG_SYM bfd_elf32_microblaze_vec
3031 #define TARGET_BIG_NAME "elf32-microblaze"
3032
3033 #define ELF_ARCH bfd_arch_microblaze
3034 #define ELF_MACHINE_CODE EM_MICROBLAZE
3035 #define ELF_MACHINE_ALT1 EM_MICROBLAZE_OLD
3036 #define ELF_MAXPAGESIZE 0x4 /* 4k, if we ever have 'em. */
3037 #define elf_info_to_howto microblaze_elf_info_to_howto
3038 #define elf_info_to_howto_rel NULL
3039
3040 #define bfd_elf32_bfd_reloc_type_lookup microblaze_elf_reloc_type_lookup
3041 #define bfd_elf32_bfd_is_local_label_name microblaze_elf_is_local_label_name
3042 #define elf_backend_relocate_section microblaze_elf_relocate_section
3043 #define bfd_elf32_bfd_relax_section microblaze_elf_relax_section
3044 #define bfd_elf32_bfd_reloc_name_lookup microblaze_elf_reloc_name_lookup
3045
3046 #define elf_backend_gc_mark_hook microblaze_elf_gc_mark_hook
3047 #define elf_backend_gc_sweep_hook microblaze_elf_gc_sweep_hook
3048 #define elf_backend_check_relocs microblaze_elf_check_relocs
3049 #define elf_backend_copy_indirect_symbol microblaze_elf_copy_indirect_symbol
3050 #define bfd_elf32_bfd_link_hash_table_create microblaze_elf_link_hash_table_create
3051 #define elf_backend_can_gc_sections 1
3052 #define elf_backend_can_refcount 1
3053 #define elf_backend_want_got_plt 1
3054 #define elf_backend_plt_readonly 1
3055 #define elf_backend_got_header_size 12
3056 #define elf_backend_rela_normal 1
3057
3058 #define elf_backend_adjust_dynamic_symbol microblaze_elf_adjust_dynamic_symbol
3059 #define elf_backend_create_dynamic_sections microblaze_elf_create_dynamic_sections
3060 #define elf_backend_finish_dynamic_sections microblaze_elf_finish_dynamic_sections
3061 #define elf_backend_finish_dynamic_symbol microblaze_elf_finish_dynamic_symbol
3062 #define elf_backend_size_dynamic_sections microblaze_elf_size_dynamic_sections
3063 #define elf_backend_add_symbol_hook microblaze_elf_add_symbol_hook
3064
3065 #include "elf32-target.h"
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