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bfd: bfin: drop needless symbol flag handling imported from FRV
[deliverable/binutils-gdb.git] / bfd / elf32-bfin.c
1 /* ADI Blackfin BFD support for 32-bit ELF.
2 Copyright 2005, 2006, 2007, 2008, 2009, 2010
3 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 Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/bfin.h"
27 #include "dwarf2.h"
28 #include "hashtab.h"
29
30 /* FUNCTION : bfin_pltpc_reloc
31 ABSTRACT : TODO : figure out how to handle pltpc relocs. */
32 static bfd_reloc_status_type
33 bfin_pltpc_reloc (
34 bfd *abfd ATTRIBUTE_UNUSED,
35 arelent *reloc_entry ATTRIBUTE_UNUSED,
36 asymbol *symbol ATTRIBUTE_UNUSED,
37 PTR data ATTRIBUTE_UNUSED,
38 asection *input_section ATTRIBUTE_UNUSED,
39 bfd *output_bfd ATTRIBUTE_UNUSED,
40 char **error_message ATTRIBUTE_UNUSED)
41 {
42 bfd_reloc_status_type flag = bfd_reloc_ok;
43 return flag;
44 }
45 \f
46
47 static bfd_reloc_status_type
48 bfin_pcrel24_reloc (bfd *abfd,
49 arelent *reloc_entry,
50 asymbol *symbol,
51 PTR data,
52 asection *input_section,
53 bfd *output_bfd,
54 char **error_message ATTRIBUTE_UNUSED)
55 {
56 bfd_vma relocation;
57 bfd_size_type addr = reloc_entry->address;
58 bfd_vma output_base = 0;
59 reloc_howto_type *howto = reloc_entry->howto;
60 asection *output_section;
61 bfd_boolean relocatable = (output_bfd != NULL);
62
63 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
64 return bfd_reloc_outofrange;
65
66 if (bfd_is_und_section (symbol->section)
67 && (symbol->flags & BSF_WEAK) == 0
68 && !relocatable)
69 return bfd_reloc_undefined;
70
71 if (bfd_is_com_section (symbol->section))
72 relocation = 0;
73 else
74 relocation = symbol->value;
75
76 output_section = symbol->section->output_section;
77
78 if (relocatable)
79 output_base = 0;
80 else
81 output_base = output_section->vma;
82
83 if (!relocatable || !strcmp (symbol->name, symbol->section->name))
84 relocation += output_base + symbol->section->output_offset;
85
86 if (!relocatable && !strcmp (symbol->name, symbol->section->name))
87 relocation += reloc_entry->addend;
88
89 relocation -= input_section->output_section->vma + input_section->output_offset;
90 relocation -= reloc_entry->address;
91
92 if (howto->complain_on_overflow != complain_overflow_dont)
93 {
94 bfd_reloc_status_type status;
95 status = bfd_check_overflow (howto->complain_on_overflow,
96 howto->bitsize,
97 howto->rightshift,
98 bfd_arch_bits_per_address(abfd),
99 relocation);
100 if (status != bfd_reloc_ok)
101 return status;
102 }
103
104 /* if rightshift is 1 and the number odd, return error. */
105 if (howto->rightshift && (relocation & 0x01))
106 {
107 fprintf(stderr, "relocation should be even number\n");
108 return bfd_reloc_overflow;
109 }
110
111 relocation >>= (bfd_vma) howto->rightshift;
112 /* Shift everything up to where it's going to be used. */
113
114 relocation <<= (bfd_vma) howto->bitpos;
115
116 if (relocatable)
117 {
118 reloc_entry->address += input_section->output_offset;
119 reloc_entry->addend += symbol->section->output_offset;
120 }
121
122 {
123 short x;
124
125 /* We are getting reloc_entry->address 2 byte off from
126 the start of instruction. Assuming absolute postion
127 of the reloc data. But, following code had been written assuming
128 reloc address is starting at begining of instruction.
129 To compensate that I have increased the value of
130 relocation by 1 (effectively 2) and used the addr -2 instead of addr. */
131
132 relocation += 1;
133 x = bfd_get_16 (abfd, (bfd_byte *) data + addr - 2);
134 x = (x & 0xff00) | ((relocation >> 16) & 0xff);
135 bfd_put_16 (abfd, x, (unsigned char *) data + addr - 2);
136
137 x = bfd_get_16 (abfd, (bfd_byte *) data + addr);
138 x = relocation & 0xFFFF;
139 bfd_put_16 (abfd, x, (unsigned char *) data + addr );
140 }
141 return bfd_reloc_ok;
142 }
143
144 static bfd_reloc_status_type
145 bfin_imm16_reloc (bfd *abfd,
146 arelent *reloc_entry,
147 asymbol *symbol,
148 PTR data,
149 asection *input_section,
150 bfd *output_bfd,
151 char **error_message ATTRIBUTE_UNUSED)
152 {
153 bfd_vma relocation, x;
154 bfd_size_type reloc_addr = reloc_entry->address;
155 bfd_vma output_base = 0;
156 reloc_howto_type *howto = reloc_entry->howto;
157 asection *output_section;
158 bfd_boolean relocatable = (output_bfd != NULL);
159
160 /* Is the address of the relocation really within the section? */
161 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
162 return bfd_reloc_outofrange;
163
164 if (bfd_is_und_section (symbol->section)
165 && (symbol->flags & BSF_WEAK) == 0
166 && !relocatable)
167 return bfd_reloc_undefined;
168
169 output_section = symbol->section->output_section;
170 relocation = symbol->value;
171
172 /* Convert input-section-relative symbol value to absolute. */
173 if (relocatable)
174 output_base = 0;
175 else
176 output_base = output_section->vma;
177
178 if (!relocatable || !strcmp (symbol->name, symbol->section->name))
179 relocation += output_base + symbol->section->output_offset;
180
181 /* Add in supplied addend. */
182 relocation += reloc_entry->addend;
183
184 if (relocatable)
185 {
186 reloc_entry->address += input_section->output_offset;
187 reloc_entry->addend += symbol->section->output_offset;
188 }
189 else
190 {
191 reloc_entry->addend = 0;
192 }
193
194 if (howto->complain_on_overflow != complain_overflow_dont)
195 {
196 bfd_reloc_status_type flag;
197 flag = bfd_check_overflow (howto->complain_on_overflow,
198 howto->bitsize,
199 howto->rightshift,
200 bfd_arch_bits_per_address(abfd),
201 relocation);
202 if (flag != bfd_reloc_ok)
203 return flag;
204 }
205
206 /* Here the variable relocation holds the final address of the
207 symbol we are relocating against, plus any addend. */
208
209 relocation >>= (bfd_vma) howto->rightshift;
210 x = relocation;
211 bfd_put_16 (abfd, x, (unsigned char *) data + reloc_addr);
212 return bfd_reloc_ok;
213 }
214
215
216 static bfd_reloc_status_type
217 bfin_byte4_reloc (bfd *abfd,
218 arelent *reloc_entry,
219 asymbol *symbol,
220 PTR data,
221 asection *input_section,
222 bfd *output_bfd,
223 char **error_message ATTRIBUTE_UNUSED)
224 {
225 bfd_vma relocation, x;
226 bfd_size_type addr = reloc_entry->address;
227 bfd_vma output_base = 0;
228 asection *output_section;
229 bfd_boolean relocatable = (output_bfd != NULL);
230
231 /* Is the address of the relocation really within the section? */
232 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
233 return bfd_reloc_outofrange;
234
235 if (bfd_is_und_section (symbol->section)
236 && (symbol->flags & BSF_WEAK) == 0
237 && !relocatable)
238 return bfd_reloc_undefined;
239
240 output_section = symbol->section->output_section;
241 relocation = symbol->value;
242 /* Convert input-section-relative symbol value to absolute. */
243 if (relocatable)
244 output_base = 0;
245 else
246 output_base = output_section->vma;
247
248 if ((symbol->name
249 && symbol->section->name
250 && !strcmp (symbol->name, symbol->section->name))
251 || !relocatable)
252 {
253 relocation += output_base + symbol->section->output_offset;
254 }
255
256 relocation += reloc_entry->addend;
257
258 if (relocatable)
259 {
260 /* This output will be relocatable ... like ld -r. */
261 reloc_entry->address += input_section->output_offset;
262 reloc_entry->addend += symbol->section->output_offset;
263 }
264 else
265 {
266 reloc_entry->addend = 0;
267 }
268
269 /* Here the variable relocation holds the final address of the
270 symbol we are relocating against, plus any addend. */
271 x = relocation & 0xFFFF0000;
272 x >>=16;
273 bfd_put_16 (abfd, x, (unsigned char *) data + addr + 2);
274
275 x = relocation & 0x0000FFFF;
276 bfd_put_16 (abfd, x, (unsigned char *) data + addr);
277 return bfd_reloc_ok;
278 }
279
280 /* bfin_bfd_reloc handles the blackfin arithmetic relocations.
281 Use this instead of bfd_perform_relocation. */
282 static bfd_reloc_status_type
283 bfin_bfd_reloc (bfd *abfd,
284 arelent *reloc_entry,
285 asymbol *symbol,
286 PTR data,
287 asection *input_section,
288 bfd *output_bfd,
289 char **error_message ATTRIBUTE_UNUSED)
290 {
291 bfd_vma relocation;
292 bfd_size_type addr = reloc_entry->address;
293 bfd_vma output_base = 0;
294 reloc_howto_type *howto = reloc_entry->howto;
295 asection *output_section;
296 bfd_boolean relocatable = (output_bfd != NULL);
297
298 /* Is the address of the relocation really within the section? */
299 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
300 return bfd_reloc_outofrange;
301
302 if (bfd_is_und_section (symbol->section)
303 && (symbol->flags & BSF_WEAK) == 0
304 && !relocatable)
305 return bfd_reloc_undefined;
306
307 /* Get symbol value. (Common symbols are special.) */
308 if (bfd_is_com_section (symbol->section))
309 relocation = 0;
310 else
311 relocation = symbol->value;
312
313 output_section = symbol->section->output_section;
314
315 /* Convert input-section-relative symbol value to absolute. */
316 if (relocatable)
317 output_base = 0;
318 else
319 output_base = output_section->vma;
320
321 if (!relocatable || !strcmp (symbol->name, symbol->section->name))
322 relocation += output_base + symbol->section->output_offset;
323
324 if (!relocatable && !strcmp (symbol->name, symbol->section->name))
325 {
326 /* Add in supplied addend. */
327 relocation += reloc_entry->addend;
328 }
329
330 /* Here the variable relocation holds the final address of the
331 symbol we are relocating against, plus any addend. */
332
333 if (howto->pc_relative == TRUE)
334 {
335 relocation -= input_section->output_section->vma + input_section->output_offset;
336
337 if (howto->pcrel_offset == TRUE)
338 relocation -= reloc_entry->address;
339 }
340
341 if (relocatable)
342 {
343 reloc_entry->address += input_section->output_offset;
344 reloc_entry->addend += symbol->section->output_offset;
345 }
346
347 if (howto->complain_on_overflow != complain_overflow_dont)
348 {
349 bfd_reloc_status_type status;
350
351 status = bfd_check_overflow (howto->complain_on_overflow,
352 howto->bitsize,
353 howto->rightshift,
354 bfd_arch_bits_per_address(abfd),
355 relocation);
356 if (status != bfd_reloc_ok)
357 return status;
358 }
359
360 /* If rightshift is 1 and the number odd, return error. */
361 if (howto->rightshift && (relocation & 0x01))
362 {
363 fprintf(stderr, "relocation should be even number\n");
364 return bfd_reloc_overflow;
365 }
366
367 relocation >>= (bfd_vma) howto->rightshift;
368
369 /* Shift everything up to where it's going to be used. */
370
371 relocation <<= (bfd_vma) howto->bitpos;
372
373 #define DOIT(x) \
374 x = ( (x & ~howto->dst_mask) | (relocation & howto->dst_mask))
375
376 /* handle 8 and 16 bit relocations here. */
377 switch (howto->size)
378 {
379 case 0:
380 {
381 char x = bfd_get_8 (abfd, (char *) data + addr);
382 DOIT (x);
383 bfd_put_8 (abfd, x, (unsigned char *) data + addr);
384 }
385 break;
386
387 case 1:
388 {
389 unsigned short x = bfd_get_16 (abfd, (bfd_byte *) data + addr);
390 DOIT (x);
391 bfd_put_16 (abfd, (bfd_vma) x, (unsigned char *) data + addr);
392 }
393 break;
394
395 default:
396 return bfd_reloc_other;
397 }
398
399 return bfd_reloc_ok;
400 }
401
402 /* HOWTO Table for blackfin.
403 Blackfin relocations are fairly complicated.
404 Some of the salient features are
405 a. Even numbered offsets. A number of (not all) relocations are
406 even numbered. This means that the rightmost bit is not stored.
407 Needs to right shift by 1 and check to see if value is not odd
408 b. A relocation can be an expression. An expression takes on
409 a variety of relocations arranged in a stack.
410 As a result, we cannot use the standard generic function as special
411 function. We will have our own, which is very similar to the standard
412 generic function except that it understands how to get the value from
413 the relocation stack. . */
414
415 #define BFIN_RELOC_MIN 0
416 #define BFIN_RELOC_MAX 0x21
417 #define BFIN_GNUEXT_RELOC_MIN 0x40
418 #define BFIN_GNUEXT_RELOC_MAX 0x43
419 #define BFIN_ARELOC_MIN 0xE0
420 #define BFIN_ARELOC_MAX 0xF3
421
422 static reloc_howto_type bfin_howto_table [] =
423 {
424 /* This reloc does nothing. . */
425 HOWTO (R_BFIN_UNUSED0, /* type. */
426 0, /* rightshift. */
427 2, /* size (0 = byte, 1 = short, 2 = long). */
428 32, /* bitsize. */
429 FALSE, /* pc_relative. */
430 0, /* bitpos. */
431 complain_overflow_bitfield, /* complain_on_overflow. */
432 bfd_elf_generic_reloc, /* special_function. */
433 "R_BFIN_UNUSED0", /* name. */
434 FALSE, /* partial_inplace. */
435 0, /* src_mask. */
436 0, /* dst_mask. */
437 FALSE), /* pcrel_offset. */
438
439 HOWTO (R_BFIN_PCREL5M2, /* type. */
440 1, /* rightshift. */
441 1, /* size (0 = byte, 1 = short, 2 = long).. */
442 4, /* bitsize. */
443 TRUE, /* pc_relative. */
444 0, /* bitpos. */
445 complain_overflow_unsigned, /* complain_on_overflow. */
446 bfin_bfd_reloc, /* special_function. */
447 "R_BFIN_PCREL5M2", /* name. */
448 FALSE, /* partial_inplace. */
449 0, /* src_mask. */
450 0x0000000F, /* dst_mask. */
451 FALSE), /* pcrel_offset. */
452
453 HOWTO (R_BFIN_UNUSED1, /* type. */
454 0, /* rightshift. */
455 2, /* size (0 = byte, 1 = short, 2 = long). */
456 32, /* bitsize. */
457 FALSE, /* pc_relative. */
458 0, /* bitpos. */
459 complain_overflow_bitfield, /* complain_on_overflow. */
460 bfd_elf_generic_reloc, /* special_function. */
461 "R_BFIN_UNUSED1", /* name. */
462 FALSE, /* partial_inplace. */
463 0, /* src_mask. */
464 0, /* dst_mask. */
465 FALSE), /* pcrel_offset. */
466
467 HOWTO (R_BFIN_PCREL10, /* type. */
468 1, /* rightshift. */
469 1, /* size (0 = byte, 1 = short, 2 = long). */
470 10, /* bitsize. */
471 TRUE, /* pc_relative. */
472 0, /* bitpos. */
473 complain_overflow_signed, /* complain_on_overflow. */
474 bfin_bfd_reloc, /* special_function. */
475 "R_BFIN_PCREL10", /* name. */
476 FALSE, /* partial_inplace. */
477 0, /* src_mask. */
478 0x000003FF, /* dst_mask. */
479 TRUE), /* pcrel_offset. */
480
481 HOWTO (R_BFIN_PCREL12_JUMP, /* type. */
482 1, /* rightshift. */
483 /* the offset is actually 13 bit
484 aligned on a word boundary so
485 only 12 bits have to be used.
486 Right shift the rightmost bit.. */
487 1, /* size (0 = byte, 1 = short, 2 = long). */
488 12, /* bitsize. */
489 TRUE, /* pc_relative. */
490 0, /* bitpos. */
491 complain_overflow_signed, /* complain_on_overflow. */
492 bfin_bfd_reloc, /* special_function. */
493 "R_BFIN_PCREL12_JUMP", /* name. */
494 FALSE, /* partial_inplace. */
495 0, /* src_mask. */
496 0x0FFF, /* dst_mask. */
497 TRUE), /* pcrel_offset. */
498
499 HOWTO (R_BFIN_RIMM16, /* type. */
500 0, /* rightshift. */
501 1, /* size (0 = byte, 1 = short, 2 = long). */
502 16, /* bitsize. */
503 FALSE, /* pc_relative. */
504 0, /* bitpos. */
505 complain_overflow_signed, /* complain_on_overflow. */
506 bfin_imm16_reloc, /* special_function. */
507 "R_BFIN_RIMM16", /* name. */
508 FALSE, /* partial_inplace. */
509 0, /* src_mask. */
510 0x0000FFFF, /* dst_mask. */
511 TRUE), /* pcrel_offset. */
512
513 HOWTO (R_BFIN_LUIMM16, /* type. */
514 0, /* rightshift. */
515 1, /* size (0 = byte, 1 = short, 2 = long). */
516 16, /* bitsize. */
517 FALSE, /* pc_relative. */
518 0, /* bitpos. */
519 complain_overflow_dont, /* complain_on_overflow. */
520 bfin_imm16_reloc, /* special_function. */
521 "R_BFIN_LUIMM16", /* name. */
522 FALSE, /* partial_inplace. */
523 0, /* src_mask. */
524 0x0000FFFF, /* dst_mask. */
525 TRUE), /* pcrel_offset. */
526
527 HOWTO (R_BFIN_HUIMM16, /* type. */
528 16, /* rightshift. */
529 1, /* size (0 = byte, 1 = short, 2 = long). */
530 16, /* bitsize. */
531 FALSE, /* pc_relative. */
532 0, /* bitpos. */
533 complain_overflow_unsigned, /* complain_on_overflow. */
534 bfin_imm16_reloc, /* special_function. */
535 "R_BFIN_HUIMM16", /* name. */
536 FALSE, /* partial_inplace. */
537 0, /* src_mask. */
538 0x0000FFFF, /* dst_mask. */
539 TRUE), /* pcrel_offset. */
540
541 HOWTO (R_BFIN_PCREL12_JUMP_S, /* type. */
542 1, /* rightshift. */
543 1, /* size (0 = byte, 1 = short, 2 = long). */
544 12, /* bitsize. */
545 TRUE, /* pc_relative. */
546 0, /* bitpos. */
547 complain_overflow_signed, /* complain_on_overflow. */
548 bfin_bfd_reloc, /* special_function. */
549 "R_BFIN_PCREL12_JUMP_S", /* name. */
550 FALSE, /* partial_inplace. */
551 0, /* src_mask. */
552 0x00000FFF, /* dst_mask. */
553 TRUE), /* pcrel_offset. */
554
555 HOWTO (R_BFIN_PCREL24_JUMP_X, /* type. */
556 1, /* rightshift. */
557 2, /* size (0 = byte, 1 = short, 2 = long). */
558 24, /* bitsize. */
559 TRUE, /* pc_relative. */
560 0, /* bitpos. */
561 complain_overflow_signed, /* complain_on_overflow. */
562 bfin_pcrel24_reloc, /* special_function. */
563 "R_BFIN_PCREL24_JUMP_X", /* name. */
564 FALSE, /* partial_inplace. */
565 0, /* src_mask. */
566 0x00FFFFFF, /* dst_mask. */
567 TRUE), /* pcrel_offset. */
568
569 HOWTO (R_BFIN_PCREL24, /* type. */
570 1, /* rightshift. */
571 2, /* size (0 = byte, 1 = short, 2 = long). */
572 24, /* bitsize. */
573 TRUE, /* pc_relative. */
574 0, /* bitpos. */
575 complain_overflow_signed, /* complain_on_overflow. */
576 bfin_pcrel24_reloc, /* special_function. */
577 "R_BFIN_PCREL24", /* name. */
578 FALSE, /* partial_inplace. */
579 0, /* src_mask. */
580 0x00FFFFFF, /* dst_mask. */
581 TRUE), /* pcrel_offset. */
582
583 HOWTO (R_BFIN_UNUSEDB, /* type. */
584 0, /* rightshift. */
585 2, /* size (0 = byte, 1 = short, 2 = long). */
586 32, /* bitsize. */
587 FALSE, /* pc_relative. */
588 0, /* bitpos. */
589 complain_overflow_dont, /* complain_on_overflow. */
590 bfd_elf_generic_reloc, /* special_function. */
591 "R_BFIN_UNUSEDB", /* name. */
592 FALSE, /* partial_inplace. */
593 0, /* src_mask. */
594 0, /* dst_mask. */
595 FALSE), /* pcrel_offset. */
596
597 HOWTO (R_BFIN_UNUSEDC, /* type. */
598 0, /* rightshift. */
599 2, /* size (0 = byte, 1 = short, 2 = long). */
600 32, /* bitsize. */
601 FALSE, /* pc_relative. */
602 0, /* bitpos. */
603 complain_overflow_dont, /* complain_on_overflow. */
604 bfd_elf_generic_reloc, /* special_function. */
605 "R_BFIN_UNUSEDC", /* name. */
606 FALSE, /* partial_inplace. */
607 0, /* src_mask. */
608 0, /* dst_mask. */
609 FALSE), /* pcrel_offset. */
610
611 HOWTO (R_BFIN_PCREL24_JUMP_L, /* type. */
612 1, /* rightshift. */
613 2, /* size (0 = byte, 1 = short, 2 = long). */
614 24, /* bitsize. */
615 TRUE, /* pc_relative. */
616 0, /* bitpos. */
617 complain_overflow_signed, /* complain_on_overflow. */
618 bfin_pcrel24_reloc, /* special_function. */
619 "R_BFIN_PCREL24_JUMP_L", /* name. */
620 FALSE, /* partial_inplace. */
621 0, /* src_mask. */
622 0x00FFFFFF, /* dst_mask. */
623 TRUE), /* pcrel_offset. */
624
625 HOWTO (R_BFIN_PCREL24_CALL_X, /* type. */
626 1, /* rightshift. */
627 2, /* size (0 = byte, 1 = short, 2 = long). */
628 24, /* bitsize. */
629 TRUE, /* pc_relative. */
630 0, /* bitpos. */
631 complain_overflow_signed, /* complain_on_overflow. */
632 bfin_pcrel24_reloc, /* special_function. */
633 "R_BFIN_PCREL24_CALL_X", /* name. */
634 FALSE, /* partial_inplace. */
635 0, /* src_mask. */
636 0x00FFFFFF, /* dst_mask. */
637 TRUE), /* pcrel_offset. */
638
639 HOWTO (R_BFIN_VAR_EQ_SYMB, /* type. */
640 0, /* rightshift. */
641 2, /* size (0 = byte, 1 = short, 2 = long). */
642 32, /* bitsize. */
643 FALSE, /* pc_relative. */
644 0, /* bitpos. */
645 complain_overflow_bitfield, /* complain_on_overflow. */
646 bfin_bfd_reloc, /* special_function. */
647 "R_BFIN_VAR_EQ_SYMB", /* name. */
648 FALSE, /* partial_inplace. */
649 0, /* src_mask. */
650 0, /* dst_mask. */
651 FALSE), /* pcrel_offset. */
652
653 HOWTO (R_BFIN_BYTE_DATA, /* type. */
654 0, /* rightshift. */
655 0, /* size (0 = byte, 1 = short, 2 = long). */
656 8, /* bitsize. */
657 FALSE, /* pc_relative. */
658 0, /* bitpos. */
659 complain_overflow_unsigned, /* complain_on_overflow. */
660 bfin_bfd_reloc, /* special_function. */
661 "R_BFIN_BYTE_DATA", /* name. */
662 FALSE, /* partial_inplace. */
663 0, /* src_mask. */
664 0xFF, /* dst_mask. */
665 TRUE), /* pcrel_offset. */
666
667 HOWTO (R_BFIN_BYTE2_DATA, /* type. */
668 0, /* rightshift. */
669 1, /* size (0 = byte, 1 = short, 2 = long). */
670 16, /* bitsize. */
671 FALSE, /* pc_relative. */
672 0, /* bitpos. */
673 complain_overflow_signed, /* complain_on_overflow. */
674 bfin_bfd_reloc, /* special_function. */
675 "R_BFIN_BYTE2_DATA", /* name. */
676 FALSE, /* partial_inplace. */
677 0, /* src_mask. */
678 0xFFFF, /* dst_mask. */
679 TRUE), /* pcrel_offset. */
680
681 HOWTO (R_BFIN_BYTE4_DATA, /* type. */
682 0, /* rightshift. */
683 2, /* size (0 = byte, 1 = short, 2 = long). */
684 32, /* bitsize. */
685 FALSE, /* pc_relative. */
686 0, /* bitpos. */
687 complain_overflow_unsigned, /* complain_on_overflow. */
688 bfin_byte4_reloc, /* special_function. */
689 "R_BFIN_BYTE4_DATA", /* name. */
690 FALSE, /* partial_inplace. */
691 0, /* src_mask. */
692 0xFFFFFFFF, /* dst_mask. */
693 TRUE), /* pcrel_offset. */
694
695 HOWTO (R_BFIN_PCREL11, /* type. */
696 1, /* rightshift. */
697 1, /* size (0 = byte, 1 = short, 2 = long). */
698 10, /* bitsize. */
699 TRUE, /* pc_relative. */
700 0, /* bitpos. */
701 complain_overflow_unsigned, /* complain_on_overflow. */
702 bfin_bfd_reloc, /* special_function. */
703 "R_BFIN_PCREL11", /* name. */
704 FALSE, /* partial_inplace. */
705 0, /* src_mask. */
706 0x000003FF, /* dst_mask. */
707 FALSE), /* pcrel_offset. */
708
709
710 /* A 18-bit signed operand with the GOT offset for the address of
711 the symbol. */
712 HOWTO (R_BFIN_GOT17M4, /* type */
713 2, /* rightshift */
714 1, /* size (0 = byte, 1 = short, 2 = long) */
715 16, /* bitsize */
716 FALSE, /* pc_relative */
717 0, /* bitpos */
718 complain_overflow_signed, /* complain_on_overflow */
719 bfd_elf_generic_reloc, /* special_function */
720 "R_BFIN_GOT17M4", /* name */
721 FALSE, /* partial_inplace */
722 0xffff, /* src_mask */
723 0xffff, /* dst_mask */
724 FALSE), /* pcrel_offset */
725
726 /* The upper 16 bits of the GOT offset for the address of the
727 symbol. */
728 HOWTO (R_BFIN_GOTHI, /* type */
729 0, /* rightshift */
730 1, /* size (0 = byte, 1 = short, 2 = long) */
731 16, /* bitsize */
732 FALSE, /* pc_relative */
733 0, /* bitpos */
734 complain_overflow_dont, /* complain_on_overflow */
735 bfd_elf_generic_reloc, /* special_function */
736 "R_BFIN_GOTHI", /* name */
737 FALSE, /* partial_inplace */
738 0xffff, /* src_mask */
739 0xffff, /* dst_mask */
740 FALSE), /* pcrel_offset */
741
742 /* The lower 16 bits of the GOT offset for the address of the
743 symbol. */
744 HOWTO (R_BFIN_GOTLO, /* type */
745 0, /* rightshift */
746 1, /* size (0 = byte, 1 = short, 2 = long) */
747 16, /* bitsize */
748 FALSE, /* pc_relative */
749 0, /* bitpos */
750 complain_overflow_dont, /* complain_on_overflow */
751 bfd_elf_generic_reloc, /* special_function */
752 "R_BFIN_GOTLO", /* name */
753 FALSE, /* partial_inplace */
754 0xffff, /* src_mask */
755 0xffff, /* dst_mask */
756 FALSE), /* pcrel_offset */
757
758 /* The 32-bit address of the canonical descriptor of a function. */
759 HOWTO (R_BFIN_FUNCDESC, /* type */
760 0, /* rightshift */
761 2, /* size (0 = byte, 1 = short, 2 = long) */
762 32, /* bitsize */
763 FALSE, /* pc_relative */
764 0, /* bitpos */
765 complain_overflow_bitfield, /* complain_on_overflow */
766 bfd_elf_generic_reloc, /* special_function */
767 "R_BFIN_FUNCDESC", /* name */
768 FALSE, /* partial_inplace */
769 0xffffffff, /* src_mask */
770 0xffffffff, /* dst_mask */
771 FALSE), /* pcrel_offset */
772
773 /* A 12-bit signed operand with the GOT offset for the address of
774 canonical descriptor of a function. */
775 HOWTO (R_BFIN_FUNCDESC_GOT17M4, /* type */
776 2, /* rightshift */
777 1, /* size (0 = byte, 1 = short, 2 = long) */
778 16, /* bitsize */
779 FALSE, /* pc_relative */
780 0, /* bitpos */
781 complain_overflow_signed, /* complain_on_overflow */
782 bfd_elf_generic_reloc, /* special_function */
783 "R_BFIN_FUNCDESC_GOT17M4", /* name */
784 FALSE, /* partial_inplace */
785 0xffff, /* src_mask */
786 0xffff, /* dst_mask */
787 FALSE), /* pcrel_offset */
788
789 /* The upper 16 bits of the GOT offset for the address of the
790 canonical descriptor of a function. */
791 HOWTO (R_BFIN_FUNCDESC_GOTHI, /* type */
792 0, /* rightshift */
793 1, /* size (0 = byte, 1 = short, 2 = long) */
794 16, /* bitsize */
795 FALSE, /* pc_relative */
796 0, /* bitpos */
797 complain_overflow_dont, /* complain_on_overflow */
798 bfd_elf_generic_reloc, /* special_function */
799 "R_BFIN_FUNCDESC_GOTHI", /* name */
800 FALSE, /* partial_inplace */
801 0xffff, /* src_mask */
802 0xffff, /* dst_mask */
803 FALSE), /* pcrel_offset */
804
805 /* The lower 16 bits of the GOT offset for the address of the
806 canonical descriptor of a function. */
807 HOWTO (R_BFIN_FUNCDESC_GOTLO, /* type */
808 0, /* rightshift */
809 1, /* size (0 = byte, 1 = short, 2 = long) */
810 16, /* bitsize */
811 FALSE, /* pc_relative */
812 0, /* bitpos */
813 complain_overflow_dont, /* complain_on_overflow */
814 bfd_elf_generic_reloc, /* special_function */
815 "R_BFIN_FUNCDESC_GOTLO", /* name */
816 FALSE, /* partial_inplace */
817 0xffff, /* src_mask */
818 0xffff, /* dst_mask */
819 FALSE), /* pcrel_offset */
820
821 /* The 32-bit address of the canonical descriptor of a function. */
822 HOWTO (R_BFIN_FUNCDESC_VALUE, /* type */
823 0, /* rightshift */
824 2, /* size (0 = byte, 1 = short, 2 = long) */
825 64, /* bitsize */
826 FALSE, /* pc_relative */
827 0, /* bitpos */
828 complain_overflow_bitfield, /* complain_on_overflow */
829 bfd_elf_generic_reloc, /* special_function */
830 "R_BFIN_FUNCDESC_VALUE", /* name */
831 FALSE, /* partial_inplace */
832 0xffffffff, /* src_mask */
833 0xffffffff, /* dst_mask */
834 FALSE), /* pcrel_offset */
835
836 /* A 12-bit signed operand with the GOT offset for the address of
837 canonical descriptor of a function. */
838 HOWTO (R_BFIN_FUNCDESC_GOTOFF17M4, /* type */
839 2, /* rightshift */
840 1, /* size (0 = byte, 1 = short, 2 = long) */
841 16, /* bitsize */
842 FALSE, /* pc_relative */
843 0, /* bitpos */
844 complain_overflow_signed, /* complain_on_overflow */
845 bfd_elf_generic_reloc, /* special_function */
846 "R_BFIN_FUNCDESC_GOTOFF17M4", /* name */
847 FALSE, /* partial_inplace */
848 0xffff, /* src_mask */
849 0xffff, /* dst_mask */
850 FALSE), /* pcrel_offset */
851
852 /* The upper 16 bits of the GOT offset for the address of the
853 canonical descriptor of a function. */
854 HOWTO (R_BFIN_FUNCDESC_GOTOFFHI, /* type */
855 0, /* rightshift */
856 1, /* size (0 = byte, 1 = short, 2 = long) */
857 16, /* bitsize */
858 FALSE, /* pc_relative */
859 0, /* bitpos */
860 complain_overflow_dont, /* complain_on_overflow */
861 bfd_elf_generic_reloc, /* special_function */
862 "R_BFIN_FUNCDESC_GOTOFFHI", /* name */
863 FALSE, /* partial_inplace */
864 0xffff, /* src_mask */
865 0xffff, /* dst_mask */
866 FALSE), /* pcrel_offset */
867
868 /* The lower 16 bits of the GOT offset for the address of the
869 canonical descriptor of a function. */
870 HOWTO (R_BFIN_FUNCDESC_GOTOFFLO, /* type */
871 0, /* rightshift */
872 1, /* size (0 = byte, 1 = short, 2 = long) */
873 16, /* bitsize */
874 FALSE, /* pc_relative */
875 0, /* bitpos */
876 complain_overflow_dont, /* complain_on_overflow */
877 bfd_elf_generic_reloc, /* special_function */
878 "R_BFIN_FUNCDESC_GOTOFFLO", /* name */
879 FALSE, /* partial_inplace */
880 0xffff, /* src_mask */
881 0xffff, /* dst_mask */
882 FALSE), /* pcrel_offset */
883
884 /* A 12-bit signed operand with the GOT offset for the address of
885 the symbol. */
886 HOWTO (R_BFIN_GOTOFF17M4, /* type */
887 2, /* rightshift */
888 1, /* size (0 = byte, 1 = short, 2 = long) */
889 16, /* bitsize */
890 FALSE, /* pc_relative */
891 0, /* bitpos */
892 complain_overflow_signed, /* complain_on_overflow */
893 bfd_elf_generic_reloc, /* special_function */
894 "R_BFIN_GOTOFF17M4", /* name */
895 FALSE, /* partial_inplace */
896 0xffff, /* src_mask */
897 0xffff, /* dst_mask */
898 FALSE), /* pcrel_offset */
899
900 /* The upper 16 bits of the GOT offset for the address of the
901 symbol. */
902 HOWTO (R_BFIN_GOTOFFHI, /* type */
903 0, /* rightshift */
904 1, /* size (0 = byte, 1 = short, 2 = long) */
905 16, /* bitsize */
906 FALSE, /* pc_relative */
907 0, /* bitpos */
908 complain_overflow_dont, /* complain_on_overflow */
909 bfd_elf_generic_reloc, /* special_function */
910 "R_BFIN_GOTOFFHI", /* name */
911 FALSE, /* partial_inplace */
912 0xffff, /* src_mask */
913 0xffff, /* dst_mask */
914 FALSE), /* pcrel_offset */
915
916 /* The lower 16 bits of the GOT offset for the address of the
917 symbol. */
918 HOWTO (R_BFIN_GOTOFFLO, /* type */
919 0, /* rightshift */
920 1, /* size (0 = byte, 1 = short, 2 = long) */
921 16, /* bitsize */
922 FALSE, /* pc_relative */
923 0, /* bitpos */
924 complain_overflow_dont, /* complain_on_overflow */
925 bfd_elf_generic_reloc, /* special_function */
926 "R_BFIN_GOTOFFLO", /* name */
927 FALSE, /* partial_inplace */
928 0xffff, /* src_mask */
929 0xffff, /* dst_mask */
930 FALSE), /* pcrel_offset */
931 };
932
933 static reloc_howto_type bfin_gnuext_howto_table [] =
934 {
935 HOWTO (R_BFIN_PLTPC, /* type. */
936 0, /* rightshift. */
937 1, /* size (0 = byte, 1 = short, 2 = long). */
938 16, /* bitsize. */
939 FALSE, /* pc_relative. */
940 0, /* bitpos. */
941 complain_overflow_bitfield, /* complain_on_overflow. */
942 bfin_pltpc_reloc, /* special_function. */
943 "R_BFIN_PLTPC", /* name. */
944 FALSE, /* partial_inplace. */
945 0xffff, /* src_mask. */
946 0xffff, /* dst_mask. */
947 FALSE), /* pcrel_offset. */
948
949 HOWTO (R_BFIN_GOT, /* type. */
950 0, /* rightshift. */
951 1, /* size (0 = byte, 1 = short, 2 = long). */
952 16, /* bitsize. */
953 FALSE, /* pc_relative. */
954 0, /* bitpos. */
955 complain_overflow_bitfield, /* complain_on_overflow. */
956 bfd_elf_generic_reloc, /* special_function. */
957 "R_BFIN_GOT", /* name. */
958 FALSE, /* partial_inplace. */
959 0x7fff, /* src_mask. */
960 0x7fff, /* dst_mask. */
961 FALSE), /* pcrel_offset. */
962
963 /* GNU extension to record C++ vtable hierarchy. */
964 HOWTO (R_BFIN_GNU_VTINHERIT, /* type. */
965 0, /* rightshift. */
966 2, /* size (0 = byte, 1 = short, 2 = long). */
967 0, /* bitsize. */
968 FALSE, /* pc_relative. */
969 0, /* bitpos. */
970 complain_overflow_dont, /* complain_on_overflow. */
971 NULL, /* special_function. */
972 "R_BFIN_GNU_VTINHERIT", /* name. */
973 FALSE, /* partial_inplace. */
974 0, /* src_mask. */
975 0, /* dst_mask. */
976 FALSE), /* pcrel_offset. */
977
978 /* GNU extension to record C++ vtable member usage. */
979 HOWTO (R_BFIN_GNU_VTENTRY, /* type. */
980 0, /* rightshift. */
981 2, /* size (0 = byte, 1 = short, 2 = long). */
982 0, /* bitsize. */
983 FALSE, /* pc_relative. */
984 0, /* bitpos. */
985 complain_overflow_dont, /* complain_on_overflow. */
986 _bfd_elf_rel_vtable_reloc_fn, /* special_function. */
987 "R_BFIN_GNU_VTENTRY", /* name. */
988 FALSE, /* partial_inplace. */
989 0, /* src_mask. */
990 0, /* dst_mask. */
991 FALSE) /* pcrel_offset. */
992 };
993
994 struct bfin_reloc_map
995 {
996 bfd_reloc_code_real_type bfd_reloc_val;
997 unsigned int bfin_reloc_val;
998 };
999
1000 static const struct bfin_reloc_map bfin_reloc_map [] =
1001 {
1002 { BFD_RELOC_NONE, R_BFIN_UNUSED0 },
1003 { BFD_RELOC_BFIN_5_PCREL, R_BFIN_PCREL5M2 },
1004 { BFD_RELOC_NONE, R_BFIN_UNUSED1 },
1005 { BFD_RELOC_BFIN_10_PCREL, R_BFIN_PCREL10 },
1006 { BFD_RELOC_BFIN_12_PCREL_JUMP, R_BFIN_PCREL12_JUMP },
1007 { BFD_RELOC_BFIN_16_IMM, R_BFIN_RIMM16 },
1008 { BFD_RELOC_BFIN_16_LOW, R_BFIN_LUIMM16 },
1009 { BFD_RELOC_BFIN_16_HIGH, R_BFIN_HUIMM16 },
1010 { BFD_RELOC_BFIN_12_PCREL_JUMP_S, R_BFIN_PCREL12_JUMP_S },
1011 { BFD_RELOC_24_PCREL, R_BFIN_PCREL24 },
1012 { BFD_RELOC_24_PCREL, R_BFIN_PCREL24 },
1013 { BFD_RELOC_BFIN_24_PCREL_JUMP_L, R_BFIN_PCREL24_JUMP_L },
1014 { BFD_RELOC_NONE, R_BFIN_UNUSEDB },
1015 { BFD_RELOC_NONE, R_BFIN_UNUSEDC },
1016 { BFD_RELOC_BFIN_24_PCREL_CALL_X, R_BFIN_PCREL24_CALL_X },
1017 { BFD_RELOC_8, R_BFIN_BYTE_DATA },
1018 { BFD_RELOC_16, R_BFIN_BYTE2_DATA },
1019 { BFD_RELOC_32, R_BFIN_BYTE4_DATA },
1020 { BFD_RELOC_BFIN_11_PCREL, R_BFIN_PCREL11 },
1021 { BFD_RELOC_BFIN_GOT, R_BFIN_GOT },
1022 { BFD_RELOC_BFIN_PLTPC, R_BFIN_PLTPC },
1023
1024 { BFD_RELOC_BFIN_GOT17M4, R_BFIN_GOT17M4 },
1025 { BFD_RELOC_BFIN_GOTHI, R_BFIN_GOTHI },
1026 { BFD_RELOC_BFIN_GOTLO, R_BFIN_GOTLO },
1027 { BFD_RELOC_BFIN_FUNCDESC, R_BFIN_FUNCDESC },
1028 { BFD_RELOC_BFIN_FUNCDESC_GOT17M4, R_BFIN_FUNCDESC_GOT17M4 },
1029 { BFD_RELOC_BFIN_FUNCDESC_GOTHI, R_BFIN_FUNCDESC_GOTHI },
1030 { BFD_RELOC_BFIN_FUNCDESC_GOTLO, R_BFIN_FUNCDESC_GOTLO },
1031 { BFD_RELOC_BFIN_FUNCDESC_VALUE, R_BFIN_FUNCDESC_VALUE },
1032 { BFD_RELOC_BFIN_FUNCDESC_GOTOFF17M4, R_BFIN_FUNCDESC_GOTOFF17M4 },
1033 { BFD_RELOC_BFIN_FUNCDESC_GOTOFFHI, R_BFIN_FUNCDESC_GOTOFFHI },
1034 { BFD_RELOC_BFIN_FUNCDESC_GOTOFFLO, R_BFIN_FUNCDESC_GOTOFFLO },
1035 { BFD_RELOC_BFIN_GOTOFF17M4, R_BFIN_GOTOFF17M4 },
1036 { BFD_RELOC_BFIN_GOTOFFHI, R_BFIN_GOTOFFHI },
1037 { BFD_RELOC_BFIN_GOTOFFLO, R_BFIN_GOTOFFLO },
1038
1039 { BFD_RELOC_VTABLE_INHERIT, R_BFIN_GNU_VTINHERIT },
1040 { BFD_RELOC_VTABLE_ENTRY, R_BFIN_GNU_VTENTRY },
1041 };
1042
1043
1044 static void
1045 bfin_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
1046 arelent *cache_ptr,
1047 Elf_Internal_Rela *dst)
1048 {
1049 unsigned int r_type;
1050
1051 r_type = ELF32_R_TYPE (dst->r_info);
1052
1053 if (r_type <= BFIN_RELOC_MAX)
1054 cache_ptr->howto = &bfin_howto_table [r_type];
1055
1056 else if (r_type >= BFIN_GNUEXT_RELOC_MIN && r_type <= BFIN_GNUEXT_RELOC_MAX)
1057 cache_ptr->howto = &bfin_gnuext_howto_table [r_type - BFIN_GNUEXT_RELOC_MIN];
1058
1059 else
1060 cache_ptr->howto = (reloc_howto_type *) NULL;
1061 }
1062
1063 /* Given a BFD reloc type, return the howto. */
1064 static reloc_howto_type *
1065 bfin_bfd_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
1066 bfd_reloc_code_real_type code)
1067 {
1068 unsigned int i;
1069 unsigned int r_type = BFIN_RELOC_MIN;
1070
1071 for (i = sizeof (bfin_reloc_map) / sizeof (bfin_reloc_map[0]); --i;)
1072 if (bfin_reloc_map[i].bfd_reloc_val == code)
1073 r_type = bfin_reloc_map[i].bfin_reloc_val;
1074
1075 if (r_type <= BFIN_RELOC_MAX && r_type > BFIN_RELOC_MIN)
1076 return &bfin_howto_table [r_type];
1077
1078 else if (r_type >= BFIN_GNUEXT_RELOC_MIN && r_type <= BFIN_GNUEXT_RELOC_MAX)
1079 return &bfin_gnuext_howto_table [r_type - BFIN_GNUEXT_RELOC_MIN];
1080
1081 return (reloc_howto_type *) NULL;
1082 }
1083
1084 static reloc_howto_type *
1085 bfin_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
1086 const char *r_name)
1087 {
1088 unsigned int i;
1089
1090 for (i = 0;
1091 i < (sizeof (bfin_howto_table)
1092 / sizeof (bfin_howto_table[0]));
1093 i++)
1094 if (bfin_howto_table[i].name != NULL
1095 && strcasecmp (bfin_howto_table[i].name, r_name) == 0)
1096 return &bfin_howto_table[i];
1097
1098 for (i = 0;
1099 i < (sizeof (bfin_gnuext_howto_table)
1100 / sizeof (bfin_gnuext_howto_table[0]));
1101 i++)
1102 if (bfin_gnuext_howto_table[i].name != NULL
1103 && strcasecmp (bfin_gnuext_howto_table[i].name, r_name) == 0)
1104 return &bfin_gnuext_howto_table[i];
1105
1106 return NULL;
1107 }
1108
1109 /* Given a bfin relocation type, return the howto. */
1110 static reloc_howto_type *
1111 bfin_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
1112 unsigned int r_type)
1113 {
1114 if (r_type <= BFIN_RELOC_MAX)
1115 return &bfin_howto_table [r_type];
1116
1117 else if (r_type >= BFIN_GNUEXT_RELOC_MIN && r_type <= BFIN_GNUEXT_RELOC_MAX)
1118 return &bfin_gnuext_howto_table [r_type - BFIN_GNUEXT_RELOC_MIN];
1119
1120 return (reloc_howto_type *) NULL;
1121 }
1122
1123 /* Return TRUE if the name is a local label.
1124 bfin local labels begin with L$. */
1125 static bfd_boolean
1126 bfin_is_local_label_name (
1127 bfd *abfd,
1128 const char *label)
1129 {
1130 if (label[0] == 'L' && label[1] == '$' )
1131 return TRUE;
1132
1133 return _bfd_elf_is_local_label_name (abfd, label);
1134 }
1135 \f
1136 /* Look through the relocs for a section during the first phase, and
1137 allocate space in the global offset table or procedure linkage
1138 table. */
1139
1140 static bfd_boolean
1141 bfin_check_relocs (bfd * abfd,
1142 struct bfd_link_info *info,
1143 asection *sec,
1144 const Elf_Internal_Rela *relocs)
1145 {
1146 bfd *dynobj;
1147 Elf_Internal_Shdr *symtab_hdr;
1148 struct elf_link_hash_entry **sym_hashes;
1149 bfd_signed_vma *local_got_refcounts;
1150 const Elf_Internal_Rela *rel;
1151 const Elf_Internal_Rela *rel_end;
1152 asection *sgot;
1153 asection *srelgot;
1154 if (info->relocatable)
1155 return TRUE;
1156
1157 dynobj = elf_hash_table (info)->dynobj;
1158 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1159 sym_hashes = elf_sym_hashes (abfd);
1160 local_got_refcounts = elf_local_got_refcounts (abfd);
1161
1162 sgot = NULL;
1163 srelgot = NULL;
1164
1165 rel_end = relocs + sec->reloc_count;
1166 for (rel = relocs; rel < rel_end; rel++)
1167 {
1168 unsigned long r_symndx;
1169 struct elf_link_hash_entry *h;
1170
1171 r_symndx = ELF32_R_SYM (rel->r_info);
1172 if (r_symndx < symtab_hdr->sh_info)
1173 h = NULL;
1174 else
1175 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1176
1177 switch (ELF32_R_TYPE (rel->r_info))
1178 {
1179 /* This relocation describes the C++ object vtable hierarchy.
1180 Reconstruct it for later use during GC. */
1181 case R_BFIN_GNU_VTINHERIT:
1182 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1183 return FALSE;
1184 break;
1185
1186 /* This relocation describes which C++ vtable entries
1187 are actually used. Record for later use during GC. */
1188 case R_BFIN_GNU_VTENTRY:
1189 BFD_ASSERT (h != NULL);
1190 if (h != NULL
1191 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1192 return FALSE;
1193 break;
1194
1195 case R_BFIN_GOT:
1196 if (h != NULL
1197 && strcmp (h->root.root.string, "__GLOBAL_OFFSET_TABLE_") == 0)
1198 break;
1199 /* Fall through. */
1200
1201 if (dynobj == NULL)
1202 {
1203 /* Create the .got section. */
1204 elf_hash_table (info)->dynobj = dynobj = abfd;
1205 if (!_bfd_elf_create_got_section (dynobj, info))
1206 return FALSE;
1207 }
1208
1209 if (sgot == NULL)
1210 {
1211 sgot = bfd_get_section_by_name (dynobj, ".got");
1212 BFD_ASSERT (sgot != NULL);
1213 }
1214
1215 if (srelgot == NULL && (h != NULL || info->shared))
1216 {
1217 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1218 if (srelgot == NULL)
1219 {
1220 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
1221 | SEC_IN_MEMORY | SEC_LINKER_CREATED
1222 | SEC_READONLY);
1223 srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
1224 flags);
1225 if (srelgot == NULL
1226 || !bfd_set_section_alignment (dynobj, srelgot, 2))
1227 return FALSE;
1228 }
1229 }
1230
1231 if (h != NULL)
1232 {
1233 if (h->got.refcount == 0)
1234 {
1235 /* Make sure this symbol is output as a dynamic symbol. */
1236 if (h->dynindx == -1 && !h->forced_local)
1237 {
1238 if (!bfd_elf_link_record_dynamic_symbol (info, h))
1239 return FALSE;
1240 }
1241
1242 /* Allocate space in the .got section. */
1243 sgot->size += 4;
1244 /* Allocate relocation space. */
1245 srelgot->size += sizeof (Elf32_External_Rela);
1246 }
1247 h->got.refcount++;
1248 }
1249 else
1250 {
1251 /* This is a global offset table entry for a local symbol. */
1252 if (local_got_refcounts == NULL)
1253 {
1254 bfd_size_type size;
1255
1256 size = symtab_hdr->sh_info;
1257 size *= sizeof (bfd_signed_vma);
1258 local_got_refcounts = ((bfd_signed_vma *)
1259 bfd_zalloc (abfd, size));
1260 if (local_got_refcounts == NULL)
1261 return FALSE;
1262 elf_local_got_refcounts (abfd) = local_got_refcounts;
1263 }
1264 if (local_got_refcounts[r_symndx] == 0)
1265 {
1266 sgot->size += 4;
1267 if (info->shared)
1268 {
1269 /* If we are generating a shared object, we need to
1270 output a R_68K_RELATIVE reloc so that the dynamic
1271 linker can adjust this GOT entry. */
1272 srelgot->size += sizeof (Elf32_External_Rela);
1273 }
1274 }
1275 local_got_refcounts[r_symndx]++;
1276 }
1277 break;
1278
1279 default:
1280 break;
1281 }
1282 }
1283
1284 return TRUE;
1285 }
1286
1287 static enum elf_reloc_type_class
1288 elf32_bfin_reloc_type_class (const Elf_Internal_Rela * rela)
1289 {
1290 switch ((int) ELF32_R_TYPE (rela->r_info))
1291 {
1292 default:
1293 return reloc_class_normal;
1294 }
1295 }
1296 \f
1297 static bfd_reloc_status_type
1298 bfin_final_link_relocate (Elf_Internal_Rela *rel, reloc_howto_type *howto,
1299 bfd *input_bfd, asection *input_section,
1300 bfd_byte *contents, bfd_vma address,
1301 bfd_vma value, bfd_vma addend)
1302 {
1303 int r_type = ELF32_R_TYPE (rel->r_info);
1304
1305 if (r_type == R_BFIN_PCREL24 || r_type == R_BFIN_PCREL24_JUMP_L)
1306 {
1307 bfd_reloc_status_type r = bfd_reloc_ok;
1308 bfd_vma x;
1309
1310 if (address > bfd_get_section_limit (input_bfd, input_section))
1311 return bfd_reloc_outofrange;
1312
1313 value += addend;
1314
1315 /* Perform usual pc-relative correction. */
1316 value -= input_section->output_section->vma + input_section->output_offset;
1317 value -= address;
1318
1319 /* We are getting reloc_entry->address 2 byte off from
1320 the start of instruction. Assuming absolute postion
1321 of the reloc data. But, following code had been written assuming
1322 reloc address is starting at begining of instruction.
1323 To compensate that I have increased the value of
1324 relocation by 1 (effectively 2) and used the addr -2 instead of addr. */
1325
1326 value += 2;
1327 address -= 2;
1328
1329 if ((value & 0xFF000000) != 0
1330 && (value & 0xFF000000) != 0xFF000000)
1331 r = bfd_reloc_overflow;
1332
1333 value >>= 1;
1334
1335 x = bfd_get_16 (input_bfd, contents + address);
1336 x = (x & 0xff00) | ((value >> 16) & 0xff);
1337 bfd_put_16 (input_bfd, x, contents + address);
1338
1339 x = bfd_get_16 (input_bfd, contents + address + 2);
1340 x = value & 0xFFFF;
1341 bfd_put_16 (input_bfd, x, contents + address + 2);
1342 return r;
1343 }
1344
1345 return _bfd_final_link_relocate (howto, input_bfd, input_section, contents,
1346 rel->r_offset, value, addend);
1347
1348 }
1349
1350 static bfd_boolean
1351 bfin_relocate_section (bfd * output_bfd,
1352 struct bfd_link_info *info,
1353 bfd * input_bfd,
1354 asection * input_section,
1355 bfd_byte * contents,
1356 Elf_Internal_Rela * relocs,
1357 Elf_Internal_Sym * local_syms,
1358 asection ** local_sections)
1359 {
1360 bfd *dynobj;
1361 Elf_Internal_Shdr *symtab_hdr;
1362 struct elf_link_hash_entry **sym_hashes;
1363 bfd_vma *local_got_offsets;
1364 asection *sgot;
1365 Elf_Internal_Rela *rel;
1366 Elf_Internal_Rela *relend;
1367 int i = 0;
1368
1369 dynobj = elf_hash_table (info)->dynobj;
1370 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1371 sym_hashes = elf_sym_hashes (input_bfd);
1372 local_got_offsets = elf_local_got_offsets (input_bfd);
1373
1374 sgot = NULL;
1375
1376 rel = relocs;
1377 relend = relocs + input_section->reloc_count;
1378 for (; rel < relend; rel++, i++)
1379 {
1380 int r_type;
1381 reloc_howto_type *howto;
1382 unsigned long r_symndx;
1383 struct elf_link_hash_entry *h;
1384 Elf_Internal_Sym *sym;
1385 asection *sec;
1386 bfd_vma relocation = 0;
1387 bfd_boolean unresolved_reloc;
1388 bfd_reloc_status_type r;
1389 bfd_vma address;
1390
1391 r_type = ELF32_R_TYPE (rel->r_info);
1392 if (r_type < 0 || r_type >= 243)
1393 {
1394 bfd_set_error (bfd_error_bad_value);
1395 return FALSE;
1396 }
1397
1398 if (r_type == R_BFIN_GNU_VTENTRY
1399 || r_type == R_BFIN_GNU_VTINHERIT)
1400 continue;
1401
1402 howto = bfin_reloc_type_lookup (input_bfd, r_type);
1403 if (howto == NULL)
1404 {
1405 bfd_set_error (bfd_error_bad_value);
1406 return FALSE;
1407 }
1408 r_symndx = ELF32_R_SYM (rel->r_info);
1409
1410 h = NULL;
1411 sym = NULL;
1412 sec = NULL;
1413 unresolved_reloc = FALSE;
1414
1415 if (r_symndx < symtab_hdr->sh_info)
1416 {
1417 sym = local_syms + r_symndx;
1418 sec = local_sections[r_symndx];
1419 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1420 }
1421 else
1422 {
1423 bfd_boolean warned;
1424
1425 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1426 r_symndx, symtab_hdr, sym_hashes,
1427 h, sec, relocation,
1428 unresolved_reloc, warned);
1429 }
1430
1431 if (sec != NULL && elf_discarded_section (sec))
1432 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1433 rel, relend, howto, contents);
1434
1435 if (info->relocatable)
1436 continue;
1437
1438 address = rel->r_offset;
1439
1440 /* Then, process normally. */
1441 switch (r_type)
1442 {
1443 case R_BFIN_GNU_VTINHERIT:
1444 case R_BFIN_GNU_VTENTRY:
1445 return bfd_reloc_ok;
1446
1447 case R_BFIN_GOT:
1448 /* Relocation is to the address of the entry for this symbol
1449 in the global offset table. */
1450 if (h != NULL
1451 && strcmp (h->root.root.string, "__GLOBAL_OFFSET_TABLE_") == 0)
1452 goto do_default;
1453 /* Fall through. */
1454 /* Relocation is the offset of the entry for this symbol in
1455 the global offset table. */
1456
1457 {
1458 bfd_vma off;
1459
1460 if (dynobj == NULL)
1461 {
1462 /* Create the .got section. */
1463 elf_hash_table (info)->dynobj = dynobj = output_bfd;
1464 if (!_bfd_elf_create_got_section (dynobj, info))
1465 return FALSE;
1466 }
1467
1468 if (sgot == NULL)
1469 {
1470 sgot = bfd_get_section_by_name (dynobj, ".got");
1471 BFD_ASSERT (sgot != NULL);
1472 }
1473
1474 if (h != NULL)
1475 {
1476 bfd_boolean dyn;
1477
1478 off = h->got.offset;
1479 BFD_ASSERT (off != (bfd_vma) - 1);
1480 dyn = elf_hash_table (info)->dynamic_sections_created;
1481
1482 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1483 || (info->shared
1484 && (info->symbolic
1485 || h->dynindx == -1
1486 || h->forced_local)
1487 && h->def_regular))
1488 {
1489 /* This is actually a static link, or it is a
1490 -Bsymbolic link and the symbol is defined
1491 locally, or the symbol was forced to be local
1492 because of a version file.. We must initialize
1493 this entry in the global offset table. Since
1494 the offset must always be a multiple of 4, we
1495 use the least significant bit to record whether
1496 we have initialized it already.
1497
1498 When doing a dynamic link, we create a .rela.got
1499 relocation entry to initialize the value. This
1500 is done in the finish_dynamic_symbol routine. */
1501 if ((off & 1) != 0)
1502 off &= ~1;
1503 else
1504 {
1505 bfd_put_32 (output_bfd, relocation,
1506 sgot->contents + off);
1507 h->got.offset |= 1;
1508 }
1509 }
1510 else
1511 unresolved_reloc = FALSE;
1512 }
1513 else
1514 {
1515 BFD_ASSERT (local_got_offsets != NULL);
1516 off = local_got_offsets[r_symndx];
1517 BFD_ASSERT (off != (bfd_vma) - 1);
1518
1519 /* The offset must always be a multiple of 4. We use
1520 the least significant bit to record whether we have
1521 already generated the necessary reloc. */
1522 if ((off & 1) != 0)
1523 off &= ~1;
1524 else
1525 {
1526 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1527
1528 if (info->shared)
1529 {
1530 asection *s;
1531 Elf_Internal_Rela outrel;
1532 bfd_byte *loc;
1533
1534 s = bfd_get_section_by_name (dynobj, ".rela.got");
1535 BFD_ASSERT (s != NULL);
1536
1537 outrel.r_offset = (sgot->output_section->vma
1538 + sgot->output_offset + off);
1539 outrel.r_info =
1540 ELF32_R_INFO (0, R_BFIN_PCREL24);
1541 outrel.r_addend = relocation;
1542 loc = s->contents;
1543 loc +=
1544 s->reloc_count++ * sizeof (Elf32_External_Rela);
1545 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1546 }
1547
1548 local_got_offsets[r_symndx] |= 1;
1549 }
1550 }
1551
1552 relocation = sgot->output_offset + off;
1553 rel->r_addend = 0;
1554 /* bfin : preg = [preg + 17bitdiv4offset] relocation is div by 4. */
1555 relocation /= 4;
1556 }
1557 goto do_default;
1558
1559 default:
1560 do_default:
1561 r = bfin_final_link_relocate (rel, howto, input_bfd, input_section,
1562 contents, address,
1563 relocation, rel->r_addend);
1564
1565 break;
1566 }
1567
1568 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1569 because such sections are not SEC_ALLOC and thus ld.so will
1570 not process them. */
1571 if (unresolved_reloc
1572 && !((input_section->flags & SEC_DEBUGGING) != 0 && h->def_dynamic))
1573 {
1574 (*_bfd_error_handler)
1575 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
1576 input_bfd,
1577 input_section, (long) rel->r_offset, h->root.root.string);
1578 return FALSE;
1579 }
1580
1581 if (r != bfd_reloc_ok)
1582 {
1583 const char *name;
1584
1585 if (h != NULL)
1586 name = h->root.root.string;
1587 else
1588 {
1589 name = bfd_elf_string_from_elf_section (input_bfd,
1590 symtab_hdr->sh_link,
1591 sym->st_name);
1592 if (name == NULL)
1593 return FALSE;
1594 if (*name == '\0')
1595 name = bfd_section_name (input_bfd, sec);
1596 }
1597
1598 if (r == bfd_reloc_overflow)
1599 {
1600 if (!(info->callbacks->reloc_overflow
1601 (info, (h ? &h->root : NULL), name, howto->name,
1602 (bfd_vma) 0, input_bfd, input_section, rel->r_offset)))
1603 return FALSE;
1604 }
1605 else
1606 {
1607 (*_bfd_error_handler)
1608 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
1609 input_bfd, input_section,
1610 (long) rel->r_offset, name, (int) r);
1611 return FALSE;
1612 }
1613 }
1614 }
1615
1616 return TRUE;
1617 }
1618
1619 static asection *
1620 bfin_gc_mark_hook (asection * sec,
1621 struct bfd_link_info *info,
1622 Elf_Internal_Rela * rel,
1623 struct elf_link_hash_entry *h,
1624 Elf_Internal_Sym * sym)
1625 {
1626 if (h != NULL)
1627 switch (ELF32_R_TYPE (rel->r_info))
1628 {
1629 case R_BFIN_GNU_VTINHERIT:
1630 case R_BFIN_GNU_VTENTRY:
1631 return NULL;
1632 }
1633
1634 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1635 }
1636
1637 /* Update the got entry reference counts for the section being removed. */
1638
1639 static bfd_boolean
1640 bfin_gc_sweep_hook (bfd * abfd,
1641 struct bfd_link_info *info,
1642 asection * sec,
1643 const Elf_Internal_Rela * relocs)
1644 {
1645 Elf_Internal_Shdr *symtab_hdr;
1646 struct elf_link_hash_entry **sym_hashes;
1647 bfd_signed_vma *local_got_refcounts;
1648 const Elf_Internal_Rela *rel, *relend;
1649 bfd *dynobj;
1650 asection *sgot;
1651 asection *srelgot;
1652
1653 dynobj = elf_hash_table (info)->dynobj;
1654 if (dynobj == NULL)
1655 return TRUE;
1656
1657 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1658 sym_hashes = elf_sym_hashes (abfd);
1659 local_got_refcounts = elf_local_got_refcounts (abfd);
1660
1661 sgot = bfd_get_section_by_name (dynobj, ".got");
1662 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1663
1664 relend = relocs + sec->reloc_count;
1665 for (rel = relocs; rel < relend; rel++)
1666 {
1667 unsigned long r_symndx;
1668 struct elf_link_hash_entry *h;
1669
1670 switch (ELF32_R_TYPE (rel->r_info))
1671 {
1672 case R_BFIN_GOT:
1673 r_symndx = ELF32_R_SYM (rel->r_info);
1674 if (r_symndx >= symtab_hdr->sh_info)
1675 {
1676 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1677 if (h->got.refcount > 0)
1678 {
1679 --h->got.refcount;
1680 if (h->got.refcount == 0)
1681 {
1682 /* We don't need the .got entry any more. */
1683 sgot->size -= 4;
1684 srelgot->size -= sizeof (Elf32_External_Rela);
1685 }
1686 }
1687 }
1688 else if (local_got_refcounts != NULL)
1689 {
1690 if (local_got_refcounts[r_symndx] > 0)
1691 {
1692 --local_got_refcounts[r_symndx];
1693 if (local_got_refcounts[r_symndx] == 0)
1694 {
1695 /* We don't need the .got entry any more. */
1696 sgot->size -= 4;
1697 if (info->shared)
1698 srelgot->size -= sizeof (Elf32_External_Rela);
1699 }
1700 }
1701 }
1702 break;
1703 default:
1704 break;
1705 }
1706 }
1707 return TRUE;
1708 }
1709 \f
1710 extern const bfd_target bfd_elf32_bfinfdpic_vec;
1711 #define IS_FDPIC(bfd) ((bfd)->xvec == &bfd_elf32_bfinfdpic_vec)
1712
1713 /* An extension of the elf hash table data structure,
1714 containing some additional Blackfin-specific data. */
1715 struct bfinfdpic_elf_link_hash_table
1716 {
1717 struct elf_link_hash_table elf;
1718
1719 /* A pointer to the .got section. */
1720 asection *sgot;
1721 /* A pointer to the .rel.got section. */
1722 asection *sgotrel;
1723 /* A pointer to the .rofixup section. */
1724 asection *sgotfixup;
1725 /* A pointer to the .plt section. */
1726 asection *splt;
1727 /* A pointer to the .rel.plt section. */
1728 asection *spltrel;
1729 /* GOT base offset. */
1730 bfd_vma got0;
1731 /* Location of the first non-lazy PLT entry, i.e., the number of
1732 bytes taken by lazy PLT entries. */
1733 bfd_vma plt0;
1734 /* A hash table holding information about which symbols were
1735 referenced with which PIC-related relocations. */
1736 struct htab *relocs_info;
1737 /* Summary reloc information collected by
1738 _bfinfdpic_count_got_plt_entries. */
1739 struct _bfinfdpic_dynamic_got_info *g;
1740 };
1741
1742 /* Get the Blackfin ELF linker hash table from a link_info structure. */
1743
1744 #define bfinfdpic_hash_table(info) \
1745 (elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \
1746 == BFIN_ELF_DATA ? ((struct bfinfdpic_elf_link_hash_table *) ((info)->hash)) : NULL)
1747
1748 #define bfinfdpic_got_section(info) \
1749 (bfinfdpic_hash_table (info)->sgot)
1750 #define bfinfdpic_gotrel_section(info) \
1751 (bfinfdpic_hash_table (info)->sgotrel)
1752 #define bfinfdpic_gotfixup_section(info) \
1753 (bfinfdpic_hash_table (info)->sgotfixup)
1754 #define bfinfdpic_plt_section(info) \
1755 (bfinfdpic_hash_table (info)->splt)
1756 #define bfinfdpic_pltrel_section(info) \
1757 (bfinfdpic_hash_table (info)->spltrel)
1758 #define bfinfdpic_relocs_info(info) \
1759 (bfinfdpic_hash_table (info)->relocs_info)
1760 #define bfinfdpic_got_initial_offset(info) \
1761 (bfinfdpic_hash_table (info)->got0)
1762 #define bfinfdpic_plt_initial_offset(info) \
1763 (bfinfdpic_hash_table (info)->plt0)
1764 #define bfinfdpic_dynamic_got_plt_info(info) \
1765 (bfinfdpic_hash_table (info)->g)
1766
1767 /* The name of the dynamic interpreter. This is put in the .interp
1768 section. */
1769
1770 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
1771
1772 #define DEFAULT_STACK_SIZE 0x20000
1773
1774 /* This structure is used to collect the number of entries present in
1775 each addressable range of the got. */
1776 struct _bfinfdpic_dynamic_got_info
1777 {
1778 /* Several bits of information about the current link. */
1779 struct bfd_link_info *info;
1780 /* Total size needed for GOT entries within the 18- or 32-bit
1781 ranges. */
1782 bfd_vma got17m4, gothilo;
1783 /* Total size needed for function descriptor entries within the 18-
1784 or 32-bit ranges. */
1785 bfd_vma fd17m4, fdhilo;
1786 /* Total size needed function descriptor entries referenced in PLT
1787 entries, that would be profitable to place in offsets close to
1788 the PIC register. */
1789 bfd_vma fdplt;
1790 /* Total size needed by lazy PLT entries. */
1791 bfd_vma lzplt;
1792 /* Number of relocations carried over from input object files. */
1793 unsigned long relocs;
1794 /* Number of fixups introduced by relocations in input object files. */
1795 unsigned long fixups;
1796 };
1797
1798 /* Create a Blackfin ELF linker hash table. */
1799
1800 static struct bfd_link_hash_table *
1801 bfinfdpic_elf_link_hash_table_create (bfd *abfd)
1802 {
1803 struct bfinfdpic_elf_link_hash_table *ret;
1804 bfd_size_type amt = sizeof (struct bfinfdpic_elf_link_hash_table);
1805
1806 ret = bfd_zalloc (abfd, amt);
1807 if (ret == NULL)
1808 return NULL;
1809
1810 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1811 _bfd_elf_link_hash_newfunc,
1812 sizeof (struct elf_link_hash_entry),
1813 BFIN_ELF_DATA))
1814 {
1815 free (ret);
1816 return NULL;
1817 }
1818
1819 return &ret->elf.root;
1820 }
1821
1822 /* Decide whether a reference to a symbol can be resolved locally or
1823 not. If the symbol is protected, we want the local address, but
1824 its function descriptor must be assigned by the dynamic linker. */
1825 #define BFINFDPIC_SYM_LOCAL(INFO, H) \
1826 (_bfd_elf_symbol_refs_local_p ((H), (INFO), 1) \
1827 || ! elf_hash_table (INFO)->dynamic_sections_created)
1828 #define BFINFDPIC_FUNCDESC_LOCAL(INFO, H) \
1829 ((H)->dynindx == -1 || ! elf_hash_table (INFO)->dynamic_sections_created)
1830
1831 /* This structure collects information on what kind of GOT, PLT or
1832 function descriptors are required by relocations that reference a
1833 certain symbol. */
1834 struct bfinfdpic_relocs_info
1835 {
1836 /* The index of the symbol, as stored in the relocation r_info, if
1837 we have a local symbol; -1 otherwise. */
1838 long symndx;
1839 union
1840 {
1841 /* The input bfd in which the symbol is defined, if it's a local
1842 symbol. */
1843 bfd *abfd;
1844 /* If symndx == -1, the hash table entry corresponding to a global
1845 symbol (even if it turns out to bind locally, in which case it
1846 should ideally be replaced with section's symndx + addend). */
1847 struct elf_link_hash_entry *h;
1848 } d;
1849 /* The addend of the relocation that references the symbol. */
1850 bfd_vma addend;
1851
1852 /* The fields above are used to identify an entry. The fields below
1853 contain information on how an entry is used and, later on, which
1854 locations it was assigned. */
1855 /* The following 2 fields record whether the symbol+addend above was
1856 ever referenced with a GOT relocation. The 17M4 suffix indicates a
1857 GOT17M4 relocation; hilo is used for GOTLO/GOTHI pairs. */
1858 unsigned got17m4;
1859 unsigned gothilo;
1860 /* Whether a FUNCDESC relocation references symbol+addend. */
1861 unsigned fd;
1862 /* Whether a FUNCDESC_GOT relocation references symbol+addend. */
1863 unsigned fdgot17m4;
1864 unsigned fdgothilo;
1865 /* Whether a FUNCDESC_GOTOFF relocation references symbol+addend. */
1866 unsigned fdgoff17m4;
1867 unsigned fdgoffhilo;
1868 /* Whether symbol+addend is referenced with GOTOFF17M4, GOTOFFLO or
1869 GOTOFFHI relocations. The addend doesn't really matter, since we
1870 envision that this will only be used to check whether the symbol
1871 is mapped to the same segment as the got. */
1872 unsigned gotoff;
1873 /* Whether symbol+addend is referenced by a LABEL24 relocation. */
1874 unsigned call;
1875 /* Whether symbol+addend is referenced by a 32 or FUNCDESC_VALUE
1876 relocation. */
1877 unsigned sym;
1878 /* Whether we need a PLT entry for a symbol. Should be implied by
1879 something like:
1880 (call && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h)) */
1881 unsigned plt:1;
1882 /* Whether a function descriptor should be created in this link unit
1883 for symbol+addend. Should be implied by something like:
1884 (plt || fdgotoff17m4 || fdgotofflohi
1885 || ((fd || fdgot17m4 || fdgothilo)
1886 && (symndx != -1 || BFINFDPIC_FUNCDESC_LOCAL (info, d.h)))) */
1887 unsigned privfd:1;
1888 /* Whether a lazy PLT entry is needed for this symbol+addend.
1889 Should be implied by something like:
1890 (privfd && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h)
1891 && ! (info->flags & DF_BIND_NOW)) */
1892 unsigned lazyplt:1;
1893 /* Whether we've already emitted GOT relocations and PLT entries as
1894 needed for this symbol. */
1895 unsigned done:1;
1896
1897 /* The number of R_BFIN_BYTE4_DATA, R_BFIN_FUNCDESC and R_BFIN_FUNCDESC_VALUE
1898 relocations referencing the symbol. */
1899 unsigned relocs32, relocsfd, relocsfdv;
1900
1901 /* The number of .rofixups entries and dynamic relocations allocated
1902 for this symbol, minus any that might have already been used. */
1903 unsigned fixups, dynrelocs;
1904
1905 /* The offsets of the GOT entries assigned to symbol+addend, to the
1906 function descriptor's address, and to a function descriptor,
1907 respectively. Should be zero if unassigned. The offsets are
1908 counted from the value that will be assigned to the PIC register,
1909 not from the beginning of the .got section. */
1910 bfd_signed_vma got_entry, fdgot_entry, fd_entry;
1911 /* The offsets of the PLT entries assigned to symbol+addend,
1912 non-lazy and lazy, respectively. If unassigned, should be
1913 (bfd_vma)-1. */
1914 bfd_vma plt_entry, lzplt_entry;
1915 };
1916
1917 /* Compute a hash with the key fields of an bfinfdpic_relocs_info entry. */
1918 static hashval_t
1919 bfinfdpic_relocs_info_hash (const void *entry_)
1920 {
1921 const struct bfinfdpic_relocs_info *entry = entry_;
1922
1923 return (entry->symndx == -1
1924 ? (long) entry->d.h->root.root.hash
1925 : entry->symndx + (long) entry->d.abfd->id * 257) + entry->addend;
1926 }
1927
1928 /* Test whether the key fields of two bfinfdpic_relocs_info entries are
1929 identical. */
1930 static int
1931 bfinfdpic_relocs_info_eq (const void *entry1, const void *entry2)
1932 {
1933 const struct bfinfdpic_relocs_info *e1 = entry1;
1934 const struct bfinfdpic_relocs_info *e2 = entry2;
1935
1936 return e1->symndx == e2->symndx && e1->addend == e2->addend
1937 && (e1->symndx == -1 ? e1->d.h == e2->d.h : e1->d.abfd == e2->d.abfd);
1938 }
1939
1940 /* Find or create an entry in a hash table HT that matches the key
1941 fields of the given ENTRY. If it's not found, memory for a new
1942 entry is allocated in ABFD's obstack. */
1943 static struct bfinfdpic_relocs_info *
1944 bfinfdpic_relocs_info_find (struct htab *ht,
1945 bfd *abfd,
1946 const struct bfinfdpic_relocs_info *entry,
1947 enum insert_option insert)
1948 {
1949 struct bfinfdpic_relocs_info **loc;
1950
1951 if (!ht)
1952 return NULL;
1953
1954 loc = (struct bfinfdpic_relocs_info **) htab_find_slot (ht, entry, insert);
1955
1956 if (! loc)
1957 return NULL;
1958
1959 if (*loc)
1960 return *loc;
1961
1962 *loc = bfd_zalloc (abfd, sizeof (**loc));
1963
1964 if (! *loc)
1965 return *loc;
1966
1967 (*loc)->symndx = entry->symndx;
1968 (*loc)->d = entry->d;
1969 (*loc)->addend = entry->addend;
1970 (*loc)->plt_entry = (bfd_vma)-1;
1971 (*loc)->lzplt_entry = (bfd_vma)-1;
1972
1973 return *loc;
1974 }
1975
1976 /* Obtain the address of the entry in HT associated with H's symbol +
1977 addend, creating a new entry if none existed. ABFD is only used
1978 for memory allocation purposes. */
1979 inline static struct bfinfdpic_relocs_info *
1980 bfinfdpic_relocs_info_for_global (struct htab *ht,
1981 bfd *abfd,
1982 struct elf_link_hash_entry *h,
1983 bfd_vma addend,
1984 enum insert_option insert)
1985 {
1986 struct bfinfdpic_relocs_info entry;
1987
1988 entry.symndx = -1;
1989 entry.d.h = h;
1990 entry.addend = addend;
1991
1992 return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert);
1993 }
1994
1995 /* Obtain the address of the entry in HT associated with the SYMNDXth
1996 local symbol of the input bfd ABFD, plus the addend, creating a new
1997 entry if none existed. */
1998 inline static struct bfinfdpic_relocs_info *
1999 bfinfdpic_relocs_info_for_local (struct htab *ht,
2000 bfd *abfd,
2001 long symndx,
2002 bfd_vma addend,
2003 enum insert_option insert)
2004 {
2005 struct bfinfdpic_relocs_info entry;
2006
2007 entry.symndx = symndx;
2008 entry.d.abfd = abfd;
2009 entry.addend = addend;
2010
2011 return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert);
2012 }
2013
2014 /* Merge fields set by check_relocs() of two entries that end up being
2015 mapped to the same (presumably global) symbol. */
2016
2017 inline static void
2018 bfinfdpic_pic_merge_early_relocs_info (struct bfinfdpic_relocs_info *e2,
2019 struct bfinfdpic_relocs_info const *e1)
2020 {
2021 e2->got17m4 |= e1->got17m4;
2022 e2->gothilo |= e1->gothilo;
2023 e2->fd |= e1->fd;
2024 e2->fdgot17m4 |= e1->fdgot17m4;
2025 e2->fdgothilo |= e1->fdgothilo;
2026 e2->fdgoff17m4 |= e1->fdgoff17m4;
2027 e2->fdgoffhilo |= e1->fdgoffhilo;
2028 e2->gotoff |= e1->gotoff;
2029 e2->call |= e1->call;
2030 e2->sym |= e1->sym;
2031 }
2032
2033 /* Every block of 65535 lazy PLT entries shares a single call to the
2034 resolver, inserted in the 32768th lazy PLT entry (i.e., entry #
2035 32767, counting from 0). All other lazy PLT entries branch to it
2036 in a single instruction. */
2037
2038 #define LZPLT_RESOLVER_EXTRA 10
2039 #define LZPLT_NORMAL_SIZE 6
2040 #define LZPLT_ENTRIES 1362
2041
2042 #define BFINFDPIC_LZPLT_BLOCK_SIZE ((bfd_vma) LZPLT_NORMAL_SIZE * LZPLT_ENTRIES + LZPLT_RESOLVER_EXTRA)
2043 #define BFINFDPIC_LZPLT_RESOLV_LOC (LZPLT_NORMAL_SIZE * LZPLT_ENTRIES / 2)
2044
2045 /* Add a dynamic relocation to the SRELOC section. */
2046
2047 inline static bfd_vma
2048 _bfinfdpic_add_dyn_reloc (bfd *output_bfd, asection *sreloc, bfd_vma offset,
2049 int reloc_type, long dynindx, bfd_vma addend,
2050 struct bfinfdpic_relocs_info *entry)
2051 {
2052 Elf_Internal_Rela outrel;
2053 bfd_vma reloc_offset;
2054
2055 outrel.r_offset = offset;
2056 outrel.r_info = ELF32_R_INFO (dynindx, reloc_type);
2057 outrel.r_addend = addend;
2058
2059 reloc_offset = sreloc->reloc_count * sizeof (Elf32_External_Rel);
2060 BFD_ASSERT (reloc_offset < sreloc->size);
2061 bfd_elf32_swap_reloc_out (output_bfd, &outrel,
2062 sreloc->contents + reloc_offset);
2063 sreloc->reloc_count++;
2064
2065 /* If the entry's index is zero, this relocation was probably to a
2066 linkonce section that got discarded. We reserved a dynamic
2067 relocation, but it was for another entry than the one we got at
2068 the time of emitting the relocation. Unfortunately there's no
2069 simple way for us to catch this situation, since the relocation
2070 is cleared right before calling relocate_section, at which point
2071 we no longer know what the relocation used to point to. */
2072 if (entry->symndx)
2073 {
2074 BFD_ASSERT (entry->dynrelocs > 0);
2075 entry->dynrelocs--;
2076 }
2077
2078 return reloc_offset;
2079 }
2080
2081 /* Add a fixup to the ROFIXUP section. */
2082
2083 static bfd_vma
2084 _bfinfdpic_add_rofixup (bfd *output_bfd, asection *rofixup, bfd_vma offset,
2085 struct bfinfdpic_relocs_info *entry)
2086 {
2087 bfd_vma fixup_offset;
2088
2089 if (rofixup->flags & SEC_EXCLUDE)
2090 return -1;
2091
2092 fixup_offset = rofixup->reloc_count * 4;
2093 if (rofixup->contents)
2094 {
2095 BFD_ASSERT (fixup_offset < rofixup->size);
2096 bfd_put_32 (output_bfd, offset, rofixup->contents + fixup_offset);
2097 }
2098 rofixup->reloc_count++;
2099
2100 if (entry && entry->symndx)
2101 {
2102 /* See discussion about symndx == 0 in _bfinfdpic_add_dyn_reloc
2103 above. */
2104 BFD_ASSERT (entry->fixups > 0);
2105 entry->fixups--;
2106 }
2107
2108 return fixup_offset;
2109 }
2110
2111 /* Find the segment number in which OSEC, and output section, is
2112 located. */
2113
2114 static unsigned
2115 _bfinfdpic_osec_to_segment (bfd *output_bfd, asection *osec)
2116 {
2117 Elf_Internal_Phdr *p = _bfd_elf_find_segment_containing_section (output_bfd, osec);
2118
2119 return (p != NULL) ? p - elf_tdata (output_bfd)->phdr : -1;
2120 }
2121
2122 inline static bfd_boolean
2123 _bfinfdpic_osec_readonly_p (bfd *output_bfd, asection *osec)
2124 {
2125 unsigned seg = _bfinfdpic_osec_to_segment (output_bfd, osec);
2126
2127 return ! (elf_tdata (output_bfd)->phdr[seg].p_flags & PF_W);
2128 }
2129
2130 /* Generate relocations for GOT entries, function descriptors, and
2131 code for PLT and lazy PLT entries. */
2132
2133 inline static bfd_boolean
2134 _bfinfdpic_emit_got_relocs_plt_entries (struct bfinfdpic_relocs_info *entry,
2135 bfd *output_bfd,
2136 struct bfd_link_info *info,
2137 asection *sec,
2138 Elf_Internal_Sym *sym,
2139 bfd_vma addend)
2140
2141 {
2142 bfd_vma fd_lazy_rel_offset = (bfd_vma)-1;
2143 int dynindx = -1;
2144
2145 if (entry->done)
2146 return TRUE;
2147 entry->done = 1;
2148
2149 if (entry->got_entry || entry->fdgot_entry || entry->fd_entry)
2150 {
2151 /* If the symbol is dynamic, consider it for dynamic
2152 relocations, otherwise decay to section + offset. */
2153 if (entry->symndx == -1 && entry->d.h->dynindx != -1)
2154 dynindx = entry->d.h->dynindx;
2155 else
2156 {
2157 if (sec
2158 && sec->output_section
2159 && ! bfd_is_abs_section (sec->output_section)
2160 && ! bfd_is_und_section (sec->output_section))
2161 dynindx = elf_section_data (sec->output_section)->dynindx;
2162 else
2163 dynindx = 0;
2164 }
2165 }
2166
2167 /* Generate relocation for GOT entry pointing to the symbol. */
2168 if (entry->got_entry)
2169 {
2170 int idx = dynindx;
2171 bfd_vma ad = addend;
2172
2173 /* If the symbol is dynamic but binds locally, use
2174 section+offset. */
2175 if (sec && (entry->symndx != -1
2176 || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
2177 {
2178 if (entry->symndx == -1)
2179 ad += entry->d.h->root.u.def.value;
2180 else
2181 ad += sym->st_value;
2182 ad += sec->output_offset;
2183 if (sec->output_section && elf_section_data (sec->output_section))
2184 idx = elf_section_data (sec->output_section)->dynindx;
2185 else
2186 idx = 0;
2187 }
2188
2189 /* If we're linking an executable at a fixed address, we can
2190 omit the dynamic relocation as long as the symbol is local to
2191 this module. */
2192 if (info->executable && !info->pie
2193 && (entry->symndx != -1
2194 || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
2195 {
2196 if (sec)
2197 ad += sec->output_section->vma;
2198 if (entry->symndx != -1
2199 || entry->d.h->root.type != bfd_link_hash_undefweak)
2200 _bfinfdpic_add_rofixup (output_bfd,
2201 bfinfdpic_gotfixup_section (info),
2202 bfinfdpic_got_section (info)->output_section
2203 ->vma
2204 + bfinfdpic_got_section (info)->output_offset
2205 + bfinfdpic_got_initial_offset (info)
2206 + entry->got_entry, entry);
2207 }
2208 else
2209 _bfinfdpic_add_dyn_reloc (output_bfd, bfinfdpic_gotrel_section (info),
2210 _bfd_elf_section_offset
2211 (output_bfd, info,
2212 bfinfdpic_got_section (info),
2213 bfinfdpic_got_initial_offset (info)
2214 + entry->got_entry)
2215 + bfinfdpic_got_section (info)
2216 ->output_section->vma
2217 + bfinfdpic_got_section (info)->output_offset,
2218 R_BFIN_BYTE4_DATA, idx, ad, entry);
2219
2220 bfd_put_32 (output_bfd, ad,
2221 bfinfdpic_got_section (info)->contents
2222 + bfinfdpic_got_initial_offset (info)
2223 + entry->got_entry);
2224 }
2225
2226 /* Generate relocation for GOT entry pointing to a canonical
2227 function descriptor. */
2228 if (entry->fdgot_entry)
2229 {
2230 int reloc, idx;
2231 bfd_vma ad = 0;
2232
2233 if (! (entry->symndx == -1
2234 && entry->d.h->root.type == bfd_link_hash_undefweak
2235 && BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
2236 {
2237 /* If the symbol is dynamic and there may be dynamic symbol
2238 resolution because we are, or are linked with, a shared
2239 library, emit a FUNCDESC relocation such that the dynamic
2240 linker will allocate the function descriptor. If the
2241 symbol needs a non-local function descriptor but binds
2242 locally (e.g., its visibility is protected, emit a
2243 dynamic relocation decayed to section+offset. */
2244 if (entry->symndx == -1
2245 && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h)
2246 && BFINFDPIC_SYM_LOCAL (info, entry->d.h)
2247 && !(info->executable && !info->pie))
2248 {
2249 reloc = R_BFIN_FUNCDESC;
2250 idx = elf_section_data (entry->d.h->root.u.def.section
2251 ->output_section)->dynindx;
2252 ad = entry->d.h->root.u.def.section->output_offset
2253 + entry->d.h->root.u.def.value;
2254 }
2255 else if (entry->symndx == -1
2256 && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h))
2257 {
2258 reloc = R_BFIN_FUNCDESC;
2259 idx = dynindx;
2260 ad = addend;
2261 if (ad)
2262 return FALSE;
2263 }
2264 else
2265 {
2266 /* Otherwise, we know we have a private function descriptor,
2267 so reference it directly. */
2268 if (elf_hash_table (info)->dynamic_sections_created)
2269 BFD_ASSERT (entry->privfd);
2270 reloc = R_BFIN_BYTE4_DATA;
2271 idx = elf_section_data (bfinfdpic_got_section (info)
2272 ->output_section)->dynindx;
2273 ad = bfinfdpic_got_section (info)->output_offset
2274 + bfinfdpic_got_initial_offset (info) + entry->fd_entry;
2275 }
2276
2277 /* If there is room for dynamic symbol resolution, emit the
2278 dynamic relocation. However, if we're linking an
2279 executable at a fixed location, we won't have emitted a
2280 dynamic symbol entry for the got section, so idx will be
2281 zero, which means we can and should compute the address
2282 of the private descriptor ourselves. */
2283 if (info->executable && !info->pie
2284 && (entry->symndx != -1
2285 || BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h)))
2286 {
2287 ad += bfinfdpic_got_section (info)->output_section->vma;
2288 _bfinfdpic_add_rofixup (output_bfd,
2289 bfinfdpic_gotfixup_section (info),
2290 bfinfdpic_got_section (info)
2291 ->output_section->vma
2292 + bfinfdpic_got_section (info)
2293 ->output_offset
2294 + bfinfdpic_got_initial_offset (info)
2295 + entry->fdgot_entry, entry);
2296 }
2297 else
2298 _bfinfdpic_add_dyn_reloc (output_bfd,
2299 bfinfdpic_gotrel_section (info),
2300 _bfd_elf_section_offset
2301 (output_bfd, info,
2302 bfinfdpic_got_section (info),
2303 bfinfdpic_got_initial_offset (info)
2304 + entry->fdgot_entry)
2305 + bfinfdpic_got_section (info)
2306 ->output_section->vma
2307 + bfinfdpic_got_section (info)
2308 ->output_offset,
2309 reloc, idx, ad, entry);
2310 }
2311
2312 bfd_put_32 (output_bfd, ad,
2313 bfinfdpic_got_section (info)->contents
2314 + bfinfdpic_got_initial_offset (info)
2315 + entry->fdgot_entry);
2316 }
2317
2318 /* Generate relocation to fill in a private function descriptor in
2319 the GOT. */
2320 if (entry->fd_entry)
2321 {
2322 int idx = dynindx;
2323 bfd_vma ad = addend;
2324 bfd_vma ofst;
2325 long lowword, highword;
2326
2327 /* If the symbol is dynamic but binds locally, use
2328 section+offset. */
2329 if (sec && (entry->symndx != -1
2330 || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
2331 {
2332 if (entry->symndx == -1)
2333 ad += entry->d.h->root.u.def.value;
2334 else
2335 ad += sym->st_value;
2336 ad += sec->output_offset;
2337 if (sec->output_section && elf_section_data (sec->output_section))
2338 idx = elf_section_data (sec->output_section)->dynindx;
2339 else
2340 idx = 0;
2341 }
2342
2343 /* If we're linking an executable at a fixed address, we can
2344 omit the dynamic relocation as long as the symbol is local to
2345 this module. */
2346 if (info->executable && !info->pie
2347 && (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
2348 {
2349 if (sec)
2350 ad += sec->output_section->vma;
2351 ofst = 0;
2352 if (entry->symndx != -1
2353 || entry->d.h->root.type != bfd_link_hash_undefweak)
2354 {
2355 _bfinfdpic_add_rofixup (output_bfd,
2356 bfinfdpic_gotfixup_section (info),
2357 bfinfdpic_got_section (info)
2358 ->output_section->vma
2359 + bfinfdpic_got_section (info)
2360 ->output_offset
2361 + bfinfdpic_got_initial_offset (info)
2362 + entry->fd_entry, entry);
2363 _bfinfdpic_add_rofixup (output_bfd,
2364 bfinfdpic_gotfixup_section (info),
2365 bfinfdpic_got_section (info)
2366 ->output_section->vma
2367 + bfinfdpic_got_section (info)
2368 ->output_offset
2369 + bfinfdpic_got_initial_offset (info)
2370 + entry->fd_entry + 4, entry);
2371 }
2372 }
2373 else
2374 {
2375 ofst
2376 = _bfinfdpic_add_dyn_reloc (output_bfd,
2377 entry->lazyplt
2378 ? bfinfdpic_pltrel_section (info)
2379 : bfinfdpic_gotrel_section (info),
2380 _bfd_elf_section_offset
2381 (output_bfd, info,
2382 bfinfdpic_got_section (info),
2383 bfinfdpic_got_initial_offset (info)
2384 + entry->fd_entry)
2385 + bfinfdpic_got_section (info)
2386 ->output_section->vma
2387 + bfinfdpic_got_section (info)
2388 ->output_offset,
2389 R_BFIN_FUNCDESC_VALUE, idx, ad, entry);
2390 }
2391
2392 /* If we've omitted the dynamic relocation, just emit the fixed
2393 addresses of the symbol and of the local GOT base offset. */
2394 if (info->executable && !info->pie && sec && sec->output_section)
2395 {
2396 lowword = ad;
2397 highword = bfinfdpic_got_section (info)->output_section->vma
2398 + bfinfdpic_got_section (info)->output_offset
2399 + bfinfdpic_got_initial_offset (info);
2400 }
2401 else if (entry->lazyplt)
2402 {
2403 if (ad)
2404 return FALSE;
2405
2406 fd_lazy_rel_offset = ofst;
2407
2408 /* A function descriptor used for lazy or local resolving is
2409 initialized such that its high word contains the output
2410 section index in which the PLT entries are located, and
2411 the low word contains the address of the lazy PLT entry
2412 entry point, that must be within the memory region
2413 assigned to that section. */
2414 lowword = entry->lzplt_entry + 4
2415 + bfinfdpic_plt_section (info)->output_offset
2416 + bfinfdpic_plt_section (info)->output_section->vma;
2417 highword = _bfinfdpic_osec_to_segment
2418 (output_bfd, bfinfdpic_plt_section (info)->output_section);
2419 }
2420 else
2421 {
2422 /* A function descriptor for a local function gets the index
2423 of the section. For a non-local function, it's
2424 disregarded. */
2425 lowword = ad;
2426 if (sec == NULL
2427 || (entry->symndx == -1 && entry->d.h->dynindx != -1
2428 && entry->d.h->dynindx == idx))
2429 highword = 0;
2430 else
2431 highword = _bfinfdpic_osec_to_segment
2432 (output_bfd, sec->output_section);
2433 }
2434
2435 bfd_put_32 (output_bfd, lowword,
2436 bfinfdpic_got_section (info)->contents
2437 + bfinfdpic_got_initial_offset (info)
2438 + entry->fd_entry);
2439 bfd_put_32 (output_bfd, highword,
2440 bfinfdpic_got_section (info)->contents
2441 + bfinfdpic_got_initial_offset (info)
2442 + entry->fd_entry + 4);
2443 }
2444
2445 /* Generate code for the PLT entry. */
2446 if (entry->plt_entry != (bfd_vma) -1)
2447 {
2448 bfd_byte *plt_code = bfinfdpic_plt_section (info)->contents
2449 + entry->plt_entry;
2450
2451 BFD_ASSERT (entry->fd_entry);
2452
2453 /* Figure out what kind of PLT entry we need, depending on the
2454 location of the function descriptor within the GOT. */
2455 if (entry->fd_entry >= -(1 << (18 - 1))
2456 && entry->fd_entry + 4 < (1 << (18 - 1)))
2457 {
2458 /* P1 = [P3 + fd_entry]; P3 = [P3 + fd_entry + 4] */
2459 bfd_put_32 (output_bfd,
2460 0xe519 | ((entry->fd_entry << 14) & 0xFFFF0000),
2461 plt_code);
2462 bfd_put_32 (output_bfd,
2463 0xe51b | (((entry->fd_entry + 4) << 14) & 0xFFFF0000),
2464 plt_code + 4);
2465 plt_code += 8;
2466 }
2467 else
2468 {
2469 /* P1.L = fd_entry; P1.H = fd_entry;
2470 P3 = P3 + P1;
2471 P1 = [P3];
2472 P3 = [P3 + 4]; */
2473 bfd_put_32 (output_bfd,
2474 0xe109 | (entry->fd_entry << 16),
2475 plt_code);
2476 bfd_put_32 (output_bfd,
2477 0xe149 | (entry->fd_entry & 0xFFFF0000),
2478 plt_code + 4);
2479 bfd_put_16 (output_bfd, 0x5ad9, plt_code + 8);
2480 bfd_put_16 (output_bfd, 0x9159, plt_code + 10);
2481 bfd_put_16 (output_bfd, 0xac5b, plt_code + 12);
2482 plt_code += 14;
2483 }
2484 /* JUMP (P1) */
2485 bfd_put_16 (output_bfd, 0x0051, plt_code);
2486 }
2487
2488 /* Generate code for the lazy PLT entry. */
2489 if (entry->lzplt_entry != (bfd_vma) -1)
2490 {
2491 bfd_byte *lzplt_code = bfinfdpic_plt_section (info)->contents
2492 + entry->lzplt_entry;
2493 bfd_vma resolverStub_addr;
2494
2495 bfd_put_32 (output_bfd, fd_lazy_rel_offset, lzplt_code);
2496 lzplt_code += 4;
2497
2498 resolverStub_addr = entry->lzplt_entry / BFINFDPIC_LZPLT_BLOCK_SIZE
2499 * BFINFDPIC_LZPLT_BLOCK_SIZE + BFINFDPIC_LZPLT_RESOLV_LOC;
2500 if (resolverStub_addr >= bfinfdpic_plt_initial_offset (info))
2501 resolverStub_addr = bfinfdpic_plt_initial_offset (info) - LZPLT_NORMAL_SIZE - LZPLT_RESOLVER_EXTRA;
2502
2503 if (entry->lzplt_entry == resolverStub_addr)
2504 {
2505 /* This is a lazy PLT entry that includes a resolver call.
2506 P2 = [P3];
2507 R3 = [P3 + 4];
2508 JUMP (P2); */
2509 bfd_put_32 (output_bfd,
2510 0xa05b915a,
2511 lzplt_code);
2512 bfd_put_16 (output_bfd, 0x0052, lzplt_code + 4);
2513 }
2514 else
2515 {
2516 /* JUMP.S resolverStub */
2517 bfd_put_16 (output_bfd,
2518 0x2000
2519 | (((resolverStub_addr - entry->lzplt_entry)
2520 / 2) & (((bfd_vma)1 << 12) - 1)),
2521 lzplt_code);
2522 }
2523 }
2524
2525 return TRUE;
2526 }
2527 \f
2528 /* Relocate an Blackfin ELF section.
2529
2530 The RELOCATE_SECTION function is called by the new ELF backend linker
2531 to handle the relocations for a section.
2532
2533 The relocs are always passed as Rela structures; if the section
2534 actually uses Rel structures, the r_addend field will always be
2535 zero.
2536
2537 This function is responsible for adjusting the section contents as
2538 necessary, and (if using Rela relocs and generating a relocatable
2539 output file) adjusting the reloc addend as necessary.
2540
2541 This function does not have to worry about setting the reloc
2542 address or the reloc symbol index.
2543
2544 LOCAL_SYMS is a pointer to the swapped in local symbols.
2545
2546 LOCAL_SECTIONS is an array giving the section in the input file
2547 corresponding to the st_shndx field of each local symbol.
2548
2549 The global hash table entry for the global symbols can be found
2550 via elf_sym_hashes (input_bfd).
2551
2552 When generating relocatable output, this function must handle
2553 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
2554 going to be the section symbol corresponding to the output
2555 section, which means that the addend must be adjusted
2556 accordingly. */
2557
2558 static bfd_boolean
2559 bfinfdpic_relocate_section (bfd * output_bfd,
2560 struct bfd_link_info *info,
2561 bfd * input_bfd,
2562 asection * input_section,
2563 bfd_byte * contents,
2564 Elf_Internal_Rela * relocs,
2565 Elf_Internal_Sym * local_syms,
2566 asection ** local_sections)
2567 {
2568 Elf_Internal_Shdr *symtab_hdr;
2569 struct elf_link_hash_entry **sym_hashes;
2570 Elf_Internal_Rela *rel;
2571 Elf_Internal_Rela *relend;
2572 unsigned isec_segment, got_segment, plt_segment,
2573 check_segment[2];
2574 int silence_segment_error = !(info->shared || info->pie);
2575
2576 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
2577 sym_hashes = elf_sym_hashes (input_bfd);
2578 relend = relocs + input_section->reloc_count;
2579
2580 isec_segment = _bfinfdpic_osec_to_segment (output_bfd,
2581 input_section->output_section);
2582 if (IS_FDPIC (output_bfd) && bfinfdpic_got_section (info))
2583 got_segment = _bfinfdpic_osec_to_segment (output_bfd,
2584 bfinfdpic_got_section (info)
2585 ->output_section);
2586 else
2587 got_segment = -1;
2588 if (IS_FDPIC (output_bfd) && elf_hash_table (info)->dynamic_sections_created)
2589 plt_segment = _bfinfdpic_osec_to_segment (output_bfd,
2590 bfinfdpic_plt_section (info)
2591 ->output_section);
2592 else
2593 plt_segment = -1;
2594
2595 for (rel = relocs; rel < relend; rel ++)
2596 {
2597 reloc_howto_type *howto;
2598 unsigned long r_symndx;
2599 Elf_Internal_Sym *sym;
2600 asection *sec;
2601 struct elf_link_hash_entry *h;
2602 bfd_vma relocation;
2603 bfd_reloc_status_type r;
2604 const char * name = NULL;
2605 int r_type;
2606 asection *osec;
2607 struct bfinfdpic_relocs_info *picrel;
2608 bfd_vma orig_addend = rel->r_addend;
2609
2610 r_type = ELF32_R_TYPE (rel->r_info);
2611
2612 if (r_type == R_BFIN_GNU_VTINHERIT
2613 || r_type == R_BFIN_GNU_VTENTRY)
2614 continue;
2615
2616 r_symndx = ELF32_R_SYM (rel->r_info);
2617 howto = bfin_reloc_type_lookup (input_bfd, r_type);
2618 if (howto == NULL)
2619 {
2620 bfd_set_error (bfd_error_bad_value);
2621 return FALSE;
2622 }
2623
2624 h = NULL;
2625 sym = NULL;
2626 sec = NULL;
2627
2628 if (r_symndx < symtab_hdr->sh_info)
2629 {
2630 sym = local_syms + r_symndx;
2631 osec = sec = local_sections [r_symndx];
2632 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2633
2634 name = bfd_elf_string_from_elf_section
2635 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2636 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
2637 }
2638 else
2639 {
2640 bfd_boolean warned;
2641 bfd_boolean unresolved_reloc;
2642
2643 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2644 r_symndx, symtab_hdr, sym_hashes,
2645 h, sec, relocation,
2646 unresolved_reloc, warned);
2647 osec = sec;
2648 }
2649
2650 if (sec != NULL && elf_discarded_section (sec))
2651 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2652 rel, relend, howto, contents);
2653
2654 if (info->relocatable)
2655 continue;
2656
2657 if (h != NULL
2658 && (h->root.type == bfd_link_hash_defined
2659 || h->root.type == bfd_link_hash_defweak)
2660 && !BFINFDPIC_SYM_LOCAL (info, h))
2661 {
2662 osec = sec = NULL;
2663 relocation = 0;
2664 }
2665
2666 switch (r_type)
2667 {
2668 case R_BFIN_PCREL24:
2669 case R_BFIN_PCREL24_JUMP_L:
2670 case R_BFIN_BYTE4_DATA:
2671 if (! IS_FDPIC (output_bfd))
2672 goto non_fdpic;
2673
2674 case R_BFIN_GOT17M4:
2675 case R_BFIN_GOTHI:
2676 case R_BFIN_GOTLO:
2677 case R_BFIN_FUNCDESC_GOT17M4:
2678 case R_BFIN_FUNCDESC_GOTHI:
2679 case R_BFIN_FUNCDESC_GOTLO:
2680 case R_BFIN_GOTOFF17M4:
2681 case R_BFIN_GOTOFFHI:
2682 case R_BFIN_GOTOFFLO:
2683 case R_BFIN_FUNCDESC_GOTOFF17M4:
2684 case R_BFIN_FUNCDESC_GOTOFFHI:
2685 case R_BFIN_FUNCDESC_GOTOFFLO:
2686 case R_BFIN_FUNCDESC:
2687 case R_BFIN_FUNCDESC_VALUE:
2688 if (h != NULL)
2689 picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info
2690 (info), input_bfd, h,
2691 orig_addend, INSERT);
2692 else
2693 /* In order to find the entry we created before, we must
2694 use the original addend, not the one that may have been
2695 modified by _bfd_elf_rela_local_sym(). */
2696 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info
2697 (info), input_bfd, r_symndx,
2698 orig_addend, INSERT);
2699 if (! picrel)
2700 return FALSE;
2701
2702 if (!_bfinfdpic_emit_got_relocs_plt_entries (picrel, output_bfd, info,
2703 osec, sym,
2704 rel->r_addend))
2705 {
2706 (*_bfd_error_handler)
2707 (_("%B: relocation at `%A+0x%x' references symbol `%s' with nonzero addend"),
2708 input_bfd, input_section, rel->r_offset, name);
2709 return FALSE;
2710
2711 }
2712
2713 break;
2714
2715 default:
2716 non_fdpic:
2717 picrel = NULL;
2718 if (h && ! BFINFDPIC_SYM_LOCAL (info, h))
2719 {
2720 info->callbacks->warning
2721 (info, _("relocation references symbol not defined in the module"),
2722 name, input_bfd, input_section, rel->r_offset);
2723 return FALSE;
2724 }
2725 break;
2726 }
2727
2728 switch (r_type)
2729 {
2730 case R_BFIN_PCREL24:
2731 case R_BFIN_PCREL24_JUMP_L:
2732 check_segment[0] = isec_segment;
2733 if (! IS_FDPIC (output_bfd))
2734 check_segment[1] = isec_segment;
2735 else if (picrel->plt)
2736 {
2737 relocation = bfinfdpic_plt_section (info)->output_section->vma
2738 + bfinfdpic_plt_section (info)->output_offset
2739 + picrel->plt_entry;
2740 check_segment[1] = plt_segment;
2741 }
2742 /* We don't want to warn on calls to undefined weak symbols,
2743 as calls to them must be protected by non-NULL tests
2744 anyway, and unprotected calls would invoke undefined
2745 behavior. */
2746 else if (picrel->symndx == -1
2747 && picrel->d.h->root.type == bfd_link_hash_undefweak)
2748 check_segment[1] = check_segment[0];
2749 else
2750 check_segment[1] = sec
2751 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section)
2752 : (unsigned)-1;
2753 break;
2754
2755 case R_BFIN_GOT17M4:
2756 case R_BFIN_GOTHI:
2757 case R_BFIN_GOTLO:
2758 relocation = picrel->got_entry;
2759 check_segment[0] = check_segment[1] = got_segment;
2760 break;
2761
2762 case R_BFIN_FUNCDESC_GOT17M4:
2763 case R_BFIN_FUNCDESC_GOTHI:
2764 case R_BFIN_FUNCDESC_GOTLO:
2765 relocation = picrel->fdgot_entry;
2766 check_segment[0] = check_segment[1] = got_segment;
2767 break;
2768
2769 case R_BFIN_GOTOFFHI:
2770 case R_BFIN_GOTOFF17M4:
2771 case R_BFIN_GOTOFFLO:
2772 relocation -= bfinfdpic_got_section (info)->output_section->vma
2773 + bfinfdpic_got_section (info)->output_offset
2774 + bfinfdpic_got_initial_offset (info);
2775 check_segment[0] = got_segment;
2776 check_segment[1] = sec
2777 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section)
2778 : (unsigned)-1;
2779 break;
2780
2781 case R_BFIN_FUNCDESC_GOTOFF17M4:
2782 case R_BFIN_FUNCDESC_GOTOFFHI:
2783 case R_BFIN_FUNCDESC_GOTOFFLO:
2784 relocation = picrel->fd_entry;
2785 check_segment[0] = check_segment[1] = got_segment;
2786 break;
2787
2788 case R_BFIN_FUNCDESC:
2789 {
2790 int dynindx;
2791 bfd_vma addend = rel->r_addend;
2792
2793 if (! (h && h->root.type == bfd_link_hash_undefweak
2794 && BFINFDPIC_SYM_LOCAL (info, h)))
2795 {
2796 /* If the symbol is dynamic and there may be dynamic
2797 symbol resolution because we are or are linked with a
2798 shared library, emit a FUNCDESC relocation such that
2799 the dynamic linker will allocate the function
2800 descriptor. If the symbol needs a non-local function
2801 descriptor but binds locally (e.g., its visibility is
2802 protected, emit a dynamic relocation decayed to
2803 section+offset. */
2804 if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h)
2805 && BFINFDPIC_SYM_LOCAL (info, h)
2806 && !(info->executable && !info->pie))
2807 {
2808 dynindx = elf_section_data (h->root.u.def.section
2809 ->output_section)->dynindx;
2810 addend += h->root.u.def.section->output_offset
2811 + h->root.u.def.value;
2812 }
2813 else if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h))
2814 {
2815 if (addend)
2816 {
2817 info->callbacks->warning
2818 (info, _("R_BFIN_FUNCDESC references dynamic symbol with nonzero addend"),
2819 name, input_bfd, input_section, rel->r_offset);
2820 return FALSE;
2821 }
2822 dynindx = h->dynindx;
2823 }
2824 else
2825 {
2826 /* Otherwise, we know we have a private function
2827 descriptor, so reference it directly. */
2828 BFD_ASSERT (picrel->privfd);
2829 r_type = R_BFIN_BYTE4_DATA;
2830 dynindx = elf_section_data (bfinfdpic_got_section (info)
2831 ->output_section)->dynindx;
2832 addend = bfinfdpic_got_section (info)->output_offset
2833 + bfinfdpic_got_initial_offset (info)
2834 + picrel->fd_entry;
2835 }
2836
2837 /* If there is room for dynamic symbol resolution, emit
2838 the dynamic relocation. However, if we're linking an
2839 executable at a fixed location, we won't have emitted a
2840 dynamic symbol entry for the got section, so idx will
2841 be zero, which means we can and should compute the
2842 address of the private descriptor ourselves. */
2843 if (info->executable && !info->pie
2844 && (!h || BFINFDPIC_FUNCDESC_LOCAL (info, h)))
2845 {
2846 bfd_vma offset;
2847
2848 addend += bfinfdpic_got_section (info)->output_section->vma;
2849 if ((bfd_get_section_flags (output_bfd,
2850 input_section->output_section)
2851 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
2852 {
2853 if (_bfinfdpic_osec_readonly_p (output_bfd,
2854 input_section
2855 ->output_section))
2856 {
2857 info->callbacks->warning
2858 (info,
2859 _("cannot emit fixups in read-only section"),
2860 name, input_bfd, input_section, rel->r_offset);
2861 return FALSE;
2862 }
2863
2864 offset = _bfd_elf_section_offset
2865 (output_bfd, info,
2866 input_section, rel->r_offset);
2867
2868 if (offset != (bfd_vma)-1)
2869 _bfinfdpic_add_rofixup (output_bfd,
2870 bfinfdpic_gotfixup_section
2871 (info),
2872 offset + input_section
2873 ->output_section->vma
2874 + input_section->output_offset,
2875 picrel);
2876 }
2877 }
2878 else if ((bfd_get_section_flags (output_bfd,
2879 input_section->output_section)
2880 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
2881 {
2882 bfd_vma offset;
2883
2884 if (_bfinfdpic_osec_readonly_p (output_bfd,
2885 input_section
2886 ->output_section))
2887 {
2888 info->callbacks->warning
2889 (info,
2890 _("cannot emit dynamic relocations in read-only section"),
2891 name, input_bfd, input_section, rel->r_offset);
2892 return FALSE;
2893 }
2894 offset = _bfd_elf_section_offset (output_bfd, info,
2895 input_section, rel->r_offset);
2896
2897 if (offset != (bfd_vma)-1)
2898 _bfinfdpic_add_dyn_reloc (output_bfd,
2899 bfinfdpic_gotrel_section (info),
2900 offset + input_section
2901 ->output_section->vma
2902 + input_section->output_offset,
2903 r_type,
2904 dynindx, addend, picrel);
2905 }
2906 else
2907 addend += bfinfdpic_got_section (info)->output_section->vma;
2908 }
2909
2910 /* We want the addend in-place because dynamic
2911 relocations are REL. Setting relocation to it should
2912 arrange for it to be installed. */
2913 relocation = addend - rel->r_addend;
2914 }
2915 check_segment[0] = check_segment[1] = got_segment;
2916 break;
2917
2918 case R_BFIN_BYTE4_DATA:
2919 if (! IS_FDPIC (output_bfd))
2920 {
2921 check_segment[0] = check_segment[1] = -1;
2922 break;
2923 }
2924 /* Fall through. */
2925 case R_BFIN_FUNCDESC_VALUE:
2926 {
2927 int dynindx;
2928 bfd_vma addend = rel->r_addend;
2929 bfd_vma offset;
2930 offset = _bfd_elf_section_offset (output_bfd, info,
2931 input_section, rel->r_offset);
2932
2933 /* If the symbol is dynamic but binds locally, use
2934 section+offset. */
2935 if (h && ! BFINFDPIC_SYM_LOCAL (info, h))
2936 {
2937 if (addend && r_type == R_BFIN_FUNCDESC_VALUE)
2938 {
2939 info->callbacks->warning
2940 (info, _("R_BFIN_FUNCDESC_VALUE references dynamic symbol with nonzero addend"),
2941 name, input_bfd, input_section, rel->r_offset);
2942 return FALSE;
2943 }
2944 dynindx = h->dynindx;
2945 }
2946 else
2947 {
2948 if (h)
2949 addend += h->root.u.def.value;
2950 else
2951 addend += sym->st_value;
2952 if (osec)
2953 addend += osec->output_offset;
2954 if (osec && osec->output_section
2955 && ! bfd_is_abs_section (osec->output_section)
2956 && ! bfd_is_und_section (osec->output_section))
2957 dynindx = elf_section_data (osec->output_section)->dynindx;
2958 else
2959 dynindx = 0;
2960 }
2961
2962 /* If we're linking an executable at a fixed address, we
2963 can omit the dynamic relocation as long as the symbol
2964 is defined in the current link unit (which is implied
2965 by its output section not being NULL). */
2966 if (info->executable && !info->pie
2967 && (!h || BFINFDPIC_SYM_LOCAL (info, h)))
2968 {
2969 if (osec)
2970 addend += osec->output_section->vma;
2971 if (IS_FDPIC (input_bfd)
2972 && (bfd_get_section_flags (output_bfd,
2973 input_section->output_section)
2974 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
2975 {
2976 if (_bfinfdpic_osec_readonly_p (output_bfd,
2977 input_section
2978 ->output_section))
2979 {
2980 info->callbacks->warning
2981 (info,
2982 _("cannot emit fixups in read-only section"),
2983 name, input_bfd, input_section, rel->r_offset);
2984 return FALSE;
2985 }
2986 if (!h || h->root.type != bfd_link_hash_undefweak)
2987 {
2988 if (offset != (bfd_vma)-1)
2989 {
2990 _bfinfdpic_add_rofixup (output_bfd,
2991 bfinfdpic_gotfixup_section
2992 (info),
2993 offset + input_section
2994 ->output_section->vma
2995 + input_section->output_offset,
2996 picrel);
2997
2998 if (r_type == R_BFIN_FUNCDESC_VALUE)
2999 _bfinfdpic_add_rofixup
3000 (output_bfd,
3001 bfinfdpic_gotfixup_section (info),
3002 offset + input_section->output_section->vma
3003 + input_section->output_offset + 4, picrel);
3004 }
3005 }
3006 }
3007 }
3008 else
3009 {
3010 if ((bfd_get_section_flags (output_bfd,
3011 input_section->output_section)
3012 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
3013 {
3014 if (_bfinfdpic_osec_readonly_p (output_bfd,
3015 input_section
3016 ->output_section))
3017 {
3018 info->callbacks->warning
3019 (info,
3020 _("cannot emit dynamic relocations in read-only section"),
3021 name, input_bfd, input_section, rel->r_offset);
3022 return FALSE;
3023 }
3024
3025 if (offset != (bfd_vma)-1)
3026 _bfinfdpic_add_dyn_reloc (output_bfd,
3027 bfinfdpic_gotrel_section (info),
3028 offset
3029 + input_section->output_section->vma
3030 + input_section->output_offset,
3031 r_type, dynindx, addend, picrel);
3032 }
3033 else if (osec)
3034 addend += osec->output_section->vma;
3035 /* We want the addend in-place because dynamic
3036 relocations are REL. Setting relocation to it
3037 should arrange for it to be installed. */
3038 relocation = addend - rel->r_addend;
3039 }
3040
3041 if (r_type == R_BFIN_FUNCDESC_VALUE)
3042 {
3043 /* If we've omitted the dynamic relocation, just emit
3044 the fixed addresses of the symbol and of the local
3045 GOT base offset. */
3046 if (info->executable && !info->pie
3047 && (!h || BFINFDPIC_SYM_LOCAL (info, h)))
3048 bfd_put_32 (output_bfd,
3049 bfinfdpic_got_section (info)->output_section->vma
3050 + bfinfdpic_got_section (info)->output_offset
3051 + bfinfdpic_got_initial_offset (info),
3052 contents + rel->r_offset + 4);
3053 else
3054 /* A function descriptor used for lazy or local
3055 resolving is initialized such that its high word
3056 contains the output section index in which the
3057 PLT entries are located, and the low word
3058 contains the offset of the lazy PLT entry entry
3059 point into that section. */
3060 bfd_put_32 (output_bfd,
3061 h && ! BFINFDPIC_SYM_LOCAL (info, h)
3062 ? 0
3063 : _bfinfdpic_osec_to_segment (output_bfd,
3064 sec
3065 ->output_section),
3066 contents + rel->r_offset + 4);
3067 }
3068 }
3069 check_segment[0] = check_segment[1] = got_segment;
3070 break;
3071
3072 default:
3073 check_segment[0] = isec_segment;
3074 check_segment[1] = sec
3075 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section)
3076 : (unsigned)-1;
3077 break;
3078 }
3079
3080 if (check_segment[0] != check_segment[1] && IS_FDPIC (output_bfd))
3081 {
3082 #if 1 /* If you take this out, remove the #error from fdpic-static-6.d
3083 in the ld testsuite. */
3084 /* This helps catch problems in GCC while we can't do more
3085 than static linking. The idea is to test whether the
3086 input file basename is crt0.o only once. */
3087 if (silence_segment_error == 1)
3088 silence_segment_error =
3089 (strlen (input_bfd->filename) == 6
3090 && strcmp (input_bfd->filename, "crt0.o") == 0)
3091 || (strlen (input_bfd->filename) > 6
3092 && strcmp (input_bfd->filename
3093 + strlen (input_bfd->filename) - 7,
3094 "/crt0.o") == 0)
3095 ? -1 : 0;
3096 #endif
3097 if (!silence_segment_error
3098 /* We don't want duplicate errors for undefined
3099 symbols. */
3100 && !(picrel && picrel->symndx == -1
3101 && picrel->d.h->root.type == bfd_link_hash_undefined))
3102 info->callbacks->warning
3103 (info,
3104 (info->shared || info->pie)
3105 ? _("relocations between different segments are not supported")
3106 : _("warning: relocation references a different segment"),
3107 name, input_bfd, input_section, rel->r_offset);
3108 if (!silence_segment_error && (info->shared || info->pie))
3109 return FALSE;
3110 elf_elfheader (output_bfd)->e_flags |= EF_BFIN_PIC;
3111 }
3112
3113 switch (r_type)
3114 {
3115 case R_BFIN_GOTOFFHI:
3116 /* We need the addend to be applied before we shift the
3117 value right. */
3118 relocation += rel->r_addend;
3119 /* Fall through. */
3120 case R_BFIN_GOTHI:
3121 case R_BFIN_FUNCDESC_GOTHI:
3122 case R_BFIN_FUNCDESC_GOTOFFHI:
3123 relocation >>= 16;
3124 /* Fall through. */
3125
3126 case R_BFIN_GOTLO:
3127 case R_BFIN_FUNCDESC_GOTLO:
3128 case R_BFIN_GOTOFFLO:
3129 case R_BFIN_FUNCDESC_GOTOFFLO:
3130 relocation &= 0xffff;
3131 break;
3132
3133 default:
3134 break;
3135 }
3136
3137 switch (r_type)
3138 {
3139 case R_BFIN_PCREL24:
3140 case R_BFIN_PCREL24_JUMP_L:
3141 if (! IS_FDPIC (output_bfd) || ! picrel->plt)
3142 break;
3143 /* Fall through. */
3144
3145 /* When referencing a GOT entry, a function descriptor or a
3146 PLT, we don't want the addend to apply to the reference,
3147 but rather to the referenced symbol. The actual entry
3148 will have already been created taking the addend into
3149 account, so cancel it out here. */
3150 case R_BFIN_GOT17M4:
3151 case R_BFIN_GOTHI:
3152 case R_BFIN_GOTLO:
3153 case R_BFIN_FUNCDESC_GOT17M4:
3154 case R_BFIN_FUNCDESC_GOTHI:
3155 case R_BFIN_FUNCDESC_GOTLO:
3156 case R_BFIN_FUNCDESC_GOTOFF17M4:
3157 case R_BFIN_FUNCDESC_GOTOFFHI:
3158 case R_BFIN_FUNCDESC_GOTOFFLO:
3159 /* Note that we only want GOTOFFHI, not GOTOFFLO or GOTOFF17M4
3160 here, since we do want to apply the addend to the others.
3161 Note that we've applied the addend to GOTOFFHI before we
3162 shifted it right. */
3163 case R_BFIN_GOTOFFHI:
3164 relocation -= rel->r_addend;
3165 break;
3166
3167 default:
3168 break;
3169 }
3170
3171 r = bfin_final_link_relocate (rel, howto, input_bfd, input_section,
3172 contents, rel->r_offset,
3173 relocation, rel->r_addend);
3174
3175 if (r != bfd_reloc_ok)
3176 {
3177 const char * msg = (const char *) NULL;
3178
3179 switch (r)
3180 {
3181 case bfd_reloc_overflow:
3182 r = info->callbacks->reloc_overflow
3183 (info, (h ? &h->root : NULL), name, howto->name,
3184 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3185 break;
3186
3187 case bfd_reloc_undefined:
3188 r = info->callbacks->undefined_symbol
3189 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
3190 break;
3191
3192 case bfd_reloc_outofrange:
3193 msg = _("internal error: out of range error");
3194 break;
3195
3196 case bfd_reloc_notsupported:
3197 msg = _("internal error: unsupported relocation error");
3198 break;
3199
3200 case bfd_reloc_dangerous:
3201 msg = _("internal error: dangerous relocation");
3202 break;
3203
3204 default:
3205 msg = _("internal error: unknown error");
3206 break;
3207 }
3208
3209 if (msg)
3210 r = info->callbacks->warning
3211 (info, msg, name, input_bfd, input_section, rel->r_offset);
3212
3213 if (! r)
3214 return FALSE;
3215 }
3216 }
3217
3218 return TRUE;
3219 }
3220
3221 /* Update the relocation information for the relocations of the section
3222 being removed. */
3223
3224 static bfd_boolean
3225 bfinfdpic_gc_sweep_hook (bfd *abfd,
3226 struct bfd_link_info *info,
3227 asection *sec,
3228 const Elf_Internal_Rela *relocs)
3229 {
3230 Elf_Internal_Shdr *symtab_hdr;
3231 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
3232 const Elf_Internal_Rela *rel;
3233 const Elf_Internal_Rela *rel_end;
3234 struct bfinfdpic_relocs_info *picrel;
3235
3236 BFD_ASSERT (IS_FDPIC (abfd));
3237
3238 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3239 sym_hashes = elf_sym_hashes (abfd);
3240 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
3241 if (!elf_bad_symtab (abfd))
3242 sym_hashes_end -= symtab_hdr->sh_info;
3243
3244 rel_end = relocs + sec->reloc_count;
3245 for (rel = relocs; rel < rel_end; rel++)
3246 {
3247 struct elf_link_hash_entry *h;
3248 unsigned long r_symndx;
3249
3250 r_symndx = ELF32_R_SYM (rel->r_info);
3251 if (r_symndx < symtab_hdr->sh_info)
3252 h = NULL;
3253 else
3254 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3255
3256 if (h != NULL)
3257 picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info),
3258 abfd, h,
3259 rel->r_addend, NO_INSERT);
3260 else
3261 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info
3262 (info), abfd, r_symndx,
3263 rel->r_addend, NO_INSERT);
3264
3265 if (!picrel)
3266 return TRUE;
3267
3268 switch (ELF32_R_TYPE (rel->r_info))
3269 {
3270 case R_BFIN_PCREL24:
3271 case R_BFIN_PCREL24_JUMP_L:
3272 picrel->call--;
3273 break;
3274
3275 case R_BFIN_FUNCDESC_VALUE:
3276 picrel->relocsfdv--;
3277 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
3278 picrel->relocs32++;
3279 /* Fall through. */
3280
3281 case R_BFIN_BYTE4_DATA:
3282 picrel->sym--;
3283 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
3284 picrel->relocs32--;
3285 break;
3286
3287 case R_BFIN_GOT17M4:
3288 picrel->got17m4--;
3289 break;
3290
3291 case R_BFIN_GOTHI:
3292 case R_BFIN_GOTLO:
3293 picrel->gothilo--;
3294 break;
3295
3296 case R_BFIN_FUNCDESC_GOT17M4:
3297 picrel->fdgot17m4--;
3298 break;
3299
3300 case R_BFIN_FUNCDESC_GOTHI:
3301 case R_BFIN_FUNCDESC_GOTLO:
3302 picrel->fdgothilo--;
3303 break;
3304
3305 case R_BFIN_GOTOFF17M4:
3306 case R_BFIN_GOTOFFHI:
3307 case R_BFIN_GOTOFFLO:
3308 picrel->gotoff--;
3309 break;
3310
3311 case R_BFIN_FUNCDESC_GOTOFF17M4:
3312 picrel->fdgoff17m4--;
3313 break;
3314
3315 case R_BFIN_FUNCDESC_GOTOFFHI:
3316 case R_BFIN_FUNCDESC_GOTOFFLO:
3317 picrel->fdgoffhilo--;
3318 break;
3319
3320 case R_BFIN_FUNCDESC:
3321 picrel->fd--;
3322 picrel->relocsfd--;
3323 break;
3324
3325 default:
3326 break;
3327 }
3328 }
3329
3330 return TRUE;
3331 }
3332
3333 /* We need dynamic symbols for every section, since segments can
3334 relocate independently. */
3335 static bfd_boolean
3336 _bfinfdpic_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
3337 struct bfd_link_info *info ATTRIBUTE_UNUSED,
3338 asection *p)
3339 {
3340 switch (elf_section_data (p)->this_hdr.sh_type)
3341 {
3342 case SHT_PROGBITS:
3343 case SHT_NOBITS:
3344 /* If sh_type is yet undecided, assume it could be
3345 SHT_PROGBITS/SHT_NOBITS. */
3346 case SHT_NULL:
3347 return FALSE;
3348
3349 /* There shouldn't be section relative relocations
3350 against any other section. */
3351 default:
3352 return TRUE;
3353 }
3354 }
3355
3356 /* Create a .got section, as well as its additional info field. This
3357 is almost entirely copied from
3358 elflink.c:_bfd_elf_create_got_section(). */
3359
3360 static bfd_boolean
3361 _bfin_create_got_section (bfd *abfd, struct bfd_link_info *info)
3362 {
3363 flagword flags, pltflags;
3364 asection *s;
3365 struct elf_link_hash_entry *h;
3366 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3367 int ptralign;
3368
3369 /* This function may be called more than once. */
3370 s = bfd_get_section_by_name (abfd, ".got");
3371 if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0)
3372 return TRUE;
3373
3374 /* Machine specific: although pointers are 32-bits wide, we want the
3375 GOT to be aligned to a 64-bit boundary, such that function
3376 descriptors in it can be accessed with 64-bit loads and
3377 stores. */
3378 ptralign = 3;
3379
3380 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
3381 | SEC_LINKER_CREATED);
3382 pltflags = flags;
3383
3384 s = bfd_make_section_with_flags (abfd, ".got", flags);
3385 if (s == NULL
3386 || !bfd_set_section_alignment (abfd, s, ptralign))
3387 return FALSE;
3388
3389 if (bed->want_got_plt)
3390 {
3391 s = bfd_make_section_with_flags (abfd, ".got.plt", flags);
3392 if (s == NULL
3393 || !bfd_set_section_alignment (abfd, s, ptralign))
3394 return FALSE;
3395 }
3396
3397 if (bed->want_got_sym)
3398 {
3399 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
3400 (or .got.plt) section. We don't do this in the linker script
3401 because we don't want to define the symbol if we are not creating
3402 a global offset table. */
3403 h = _bfd_elf_define_linkage_sym (abfd, info, s, "__GLOBAL_OFFSET_TABLE_");
3404 elf_hash_table (info)->hgot = h;
3405 if (h == NULL)
3406 return FALSE;
3407
3408 /* Machine-specific: we want the symbol for executables as
3409 well. */
3410 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3411 return FALSE;
3412 }
3413
3414 /* The first bit of the global offset table is the header. */
3415 s->size += bed->got_header_size;
3416
3417 /* This is the machine-specific part. Create and initialize section
3418 data for the got. */
3419 if (IS_FDPIC (abfd))
3420 {
3421 bfinfdpic_got_section (info) = s;
3422 bfinfdpic_relocs_info (info) = htab_try_create (1,
3423 bfinfdpic_relocs_info_hash,
3424 bfinfdpic_relocs_info_eq,
3425 (htab_del) NULL);
3426 if (! bfinfdpic_relocs_info (info))
3427 return FALSE;
3428
3429 s = bfd_make_section_with_flags (abfd, ".rel.got",
3430 (flags | SEC_READONLY));
3431 if (s == NULL
3432 || ! bfd_set_section_alignment (abfd, s, 2))
3433 return FALSE;
3434
3435 bfinfdpic_gotrel_section (info) = s;
3436
3437 /* Machine-specific. */
3438 s = bfd_make_section_with_flags (abfd, ".rofixup",
3439 (flags | SEC_READONLY));
3440 if (s == NULL
3441 || ! bfd_set_section_alignment (abfd, s, 2))
3442 return FALSE;
3443
3444 bfinfdpic_gotfixup_section (info) = s;
3445 }
3446
3447 pltflags |= SEC_CODE;
3448 if (bed->plt_not_loaded)
3449 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
3450 if (bed->plt_readonly)
3451 pltflags |= SEC_READONLY;
3452
3453 s = bfd_make_section_with_flags (abfd, ".plt", pltflags);
3454 if (s == NULL
3455 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
3456 return FALSE;
3457 /* Blackfin-specific: remember it. */
3458 bfinfdpic_plt_section (info) = s;
3459
3460 if (bed->want_plt_sym)
3461 {
3462 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
3463 .plt section. */
3464 struct bfd_link_hash_entry *bh = NULL;
3465
3466 if (! (_bfd_generic_link_add_one_symbol
3467 (info, abfd, "__PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, 0, NULL,
3468 FALSE, get_elf_backend_data (abfd)->collect, &bh)))
3469 return FALSE;
3470 h = (struct elf_link_hash_entry *) bh;
3471 h->def_regular = 1;
3472 h->type = STT_OBJECT;
3473
3474 if (! info->executable
3475 && ! bfd_elf_link_record_dynamic_symbol (info, h))
3476 return FALSE;
3477 }
3478
3479 /* Blackfin-specific: we want rel relocations for the plt. */
3480 s = bfd_make_section_with_flags (abfd, ".rel.plt", flags | SEC_READONLY);
3481 if (s == NULL
3482 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
3483 return FALSE;
3484 /* Blackfin-specific: remember it. */
3485 bfinfdpic_pltrel_section (info) = s;
3486
3487 return TRUE;
3488 }
3489
3490 /* Make sure the got and plt sections exist, and that our pointers in
3491 the link hash table point to them. */
3492
3493 static bfd_boolean
3494 elf32_bfinfdpic_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
3495 {
3496 /* This is mostly copied from
3497 elflink.c:_bfd_elf_create_dynamic_sections(). */
3498 flagword flags;
3499 asection *s;
3500 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3501
3502 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
3503 | SEC_LINKER_CREATED);
3504
3505 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
3506 .rel[a].bss sections. */
3507
3508 /* Blackfin-specific: we want to create the GOT in the Blackfin way. */
3509 if (! _bfin_create_got_section (abfd, info))
3510 return FALSE;
3511
3512 /* Blackfin-specific: make sure we created everything we wanted. */
3513 BFD_ASSERT (bfinfdpic_got_section (info) && bfinfdpic_gotrel_section (info)
3514 /* && bfinfdpic_gotfixup_section (info) */
3515 && bfinfdpic_plt_section (info)
3516 && bfinfdpic_pltrel_section (info));
3517
3518 if (bed->want_dynbss)
3519 {
3520 /* The .dynbss section is a place to put symbols which are defined
3521 by dynamic objects, are referenced by regular objects, and are
3522 not functions. We must allocate space for them in the process
3523 image and use a R_*_COPY reloc to tell the dynamic linker to
3524 initialize them at run time. The linker script puts the .dynbss
3525 section into the .bss section of the final image. */
3526 s = bfd_make_section_with_flags (abfd, ".dynbss",
3527 SEC_ALLOC | SEC_LINKER_CREATED);
3528 if (s == NULL)
3529 return FALSE;
3530
3531 /* The .rel[a].bss section holds copy relocs. This section is not
3532 normally needed. We need to create it here, though, so that the
3533 linker will map it to an output section. We can't just create it
3534 only if we need it, because we will not know whether we need it
3535 until we have seen all the input files, and the first time the
3536 main linker code calls BFD after examining all the input files
3537 (size_dynamic_sections) the input sections have already been
3538 mapped to the output sections. If the section turns out not to
3539 be needed, we can discard it later. We will never need this
3540 section when generating a shared object, since they do not use
3541 copy relocs. */
3542 if (! info->shared)
3543 {
3544 s = bfd_make_section_with_flags (abfd,
3545 ".rela.bss",
3546 flags | SEC_READONLY);
3547 if (s == NULL
3548 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
3549 return FALSE;
3550 }
3551 }
3552
3553 return TRUE;
3554 }
3555
3556 /* Compute the total GOT size required by each symbol in each range.
3557 Symbols may require up to 4 words in the GOT: an entry pointing to
3558 the symbol, an entry pointing to its function descriptor, and a
3559 private function descriptors taking two words. */
3560
3561 static void
3562 _bfinfdpic_count_nontls_entries (struct bfinfdpic_relocs_info *entry,
3563 struct _bfinfdpic_dynamic_got_info *dinfo)
3564 {
3565 /* Allocate space for a GOT entry pointing to the symbol. */
3566 if (entry->got17m4)
3567 dinfo->got17m4 += 4;
3568 else if (entry->gothilo)
3569 dinfo->gothilo += 4;
3570 else
3571 entry->relocs32--;
3572 entry->relocs32++;
3573
3574 /* Allocate space for a GOT entry pointing to the function
3575 descriptor. */
3576 if (entry->fdgot17m4)
3577 dinfo->got17m4 += 4;
3578 else if (entry->fdgothilo)
3579 dinfo->gothilo += 4;
3580 else
3581 entry->relocsfd--;
3582 entry->relocsfd++;
3583
3584 /* Decide whether we need a PLT entry, a function descriptor in the
3585 GOT, and a lazy PLT entry for this symbol. */
3586 entry->plt = entry->call
3587 && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h)
3588 && elf_hash_table (dinfo->info)->dynamic_sections_created;
3589 entry->privfd = entry->plt
3590 || entry->fdgoff17m4 || entry->fdgoffhilo
3591 || ((entry->fd || entry->fdgot17m4 || entry->fdgothilo)
3592 && (entry->symndx != -1
3593 || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h)));
3594 entry->lazyplt = entry->privfd
3595 && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h)
3596 && ! (dinfo->info->flags & DF_BIND_NOW)
3597 && elf_hash_table (dinfo->info)->dynamic_sections_created;
3598
3599 /* Allocate space for a function descriptor. */
3600 if (entry->fdgoff17m4)
3601 dinfo->fd17m4 += 8;
3602 else if (entry->privfd && entry->plt)
3603 dinfo->fdplt += 8;
3604 else if (entry->privfd)
3605 dinfo->fdhilo += 8;
3606 else
3607 entry->relocsfdv--;
3608 entry->relocsfdv++;
3609
3610 if (entry->lazyplt)
3611 dinfo->lzplt += LZPLT_NORMAL_SIZE;
3612 }
3613
3614 /* Compute the number of dynamic relocations and fixups that a symbol
3615 requires, and add (or subtract) from the grand and per-symbol
3616 totals. */
3617
3618 static void
3619 _bfinfdpic_count_relocs_fixups (struct bfinfdpic_relocs_info *entry,
3620 struct _bfinfdpic_dynamic_got_info *dinfo,
3621 bfd_boolean subtract)
3622 {
3623 bfd_vma relocs = 0, fixups = 0;
3624
3625 if (!dinfo->info->executable || dinfo->info->pie)
3626 relocs = entry->relocs32 + entry->relocsfd + entry->relocsfdv;
3627 else
3628 {
3629 if (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h))
3630 {
3631 if (entry->symndx != -1
3632 || entry->d.h->root.type != bfd_link_hash_undefweak)
3633 fixups += entry->relocs32 + 2 * entry->relocsfdv;
3634 }
3635 else
3636 relocs += entry->relocs32 + entry->relocsfdv;
3637
3638 if (entry->symndx != -1
3639 || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h))
3640 {
3641 if (entry->symndx != -1
3642 || entry->d.h->root.type != bfd_link_hash_undefweak)
3643 fixups += entry->relocsfd;
3644 }
3645 else
3646 relocs += entry->relocsfd;
3647 }
3648
3649 if (subtract)
3650 {
3651 relocs = - relocs;
3652 fixups = - fixups;
3653 }
3654
3655 entry->dynrelocs += relocs;
3656 entry->fixups += fixups;
3657 dinfo->relocs += relocs;
3658 dinfo->fixups += fixups;
3659 }
3660
3661 /* Compute the total GOT and PLT size required by each symbol in each range. *
3662 Symbols may require up to 4 words in the GOT: an entry pointing to
3663 the symbol, an entry pointing to its function descriptor, and a
3664 private function descriptors taking two words. */
3665
3666 static int
3667 _bfinfdpic_count_got_plt_entries (void **entryp, void *dinfo_)
3668 {
3669 struct bfinfdpic_relocs_info *entry = *entryp;
3670 struct _bfinfdpic_dynamic_got_info *dinfo = dinfo_;
3671
3672 _bfinfdpic_count_nontls_entries (entry, dinfo);
3673
3674 _bfinfdpic_count_relocs_fixups (entry, dinfo, FALSE);
3675
3676 return 1;
3677 }
3678
3679 /* This structure is used to assign offsets to got entries, function
3680 descriptors, plt entries and lazy plt entries. */
3681
3682 struct _bfinfdpic_dynamic_got_plt_info
3683 {
3684 /* Summary information collected with _bfinfdpic_count_got_plt_entries. */
3685 struct _bfinfdpic_dynamic_got_info g;
3686
3687 /* For each addressable range, we record a MAX (positive) and MIN
3688 (negative) value. CUR is used to assign got entries, and it's
3689 incremented from an initial positive value to MAX, then from MIN
3690 to FDCUR (unless FDCUR wraps around first). FDCUR is used to
3691 assign function descriptors, and it's decreased from an initial
3692 non-positive value to MIN, then from MAX down to CUR (unless CUR
3693 wraps around first). All of MIN, MAX, CUR and FDCUR always point
3694 to even words. ODD, if non-zero, indicates an odd word to be
3695 used for the next got entry, otherwise CUR is used and
3696 incremented by a pair of words, wrapping around when it reaches
3697 MAX. FDCUR is decremented (and wrapped) before the next function
3698 descriptor is chosen. FDPLT indicates the number of remaining
3699 slots that can be used for function descriptors used only by PLT
3700 entries. */
3701 struct _bfinfdpic_dynamic_got_alloc_data
3702 {
3703 bfd_signed_vma max, cur, odd, fdcur, min;
3704 bfd_vma fdplt;
3705 } got17m4, gothilo;
3706 };
3707
3708 /* Determine the positive and negative ranges to be used by each
3709 offset range in the GOT. FDCUR and CUR, that must be aligned to a
3710 double-word boundary, are the minimum (negative) and maximum
3711 (positive) GOT offsets already used by previous ranges, except for
3712 an ODD entry that may have been left behind. GOT and FD indicate
3713 the size of GOT entries and function descriptors that must be
3714 placed within the range from -WRAP to WRAP. If there's room left,
3715 up to FDPLT bytes should be reserved for additional function
3716 descriptors. */
3717
3718 inline static bfd_signed_vma
3719 _bfinfdpic_compute_got_alloc_data (struct _bfinfdpic_dynamic_got_alloc_data *gad,
3720 bfd_signed_vma fdcur,
3721 bfd_signed_vma odd,
3722 bfd_signed_vma cur,
3723 bfd_vma got,
3724 bfd_vma fd,
3725 bfd_vma fdplt,
3726 bfd_vma wrap)
3727 {
3728 bfd_signed_vma wrapmin = -wrap;
3729
3730 /* Start at the given initial points. */
3731 gad->fdcur = fdcur;
3732 gad->cur = cur;
3733
3734 /* If we had an incoming odd word and we have any got entries that
3735 are going to use it, consume it, otherwise leave gad->odd at
3736 zero. We might force gad->odd to zero and return the incoming
3737 odd such that it is used by the next range, but then GOT entries
3738 might appear to be out of order and we wouldn't be able to
3739 shorten the GOT by one word if it turns out to end with an
3740 unpaired GOT entry. */
3741 if (odd && got)
3742 {
3743 gad->odd = odd;
3744 got -= 4;
3745 odd = 0;
3746 }
3747 else
3748 gad->odd = 0;
3749
3750 /* If we're left with an unpaired GOT entry, compute its location
3751 such that we can return it. Otherwise, if got doesn't require an
3752 odd number of words here, either odd was already zero in the
3753 block above, or it was set to zero because got was non-zero, or
3754 got was already zero. In the latter case, we want the value of
3755 odd to carry over to the return statement, so we don't want to
3756 reset odd unless the condition below is true. */
3757 if (got & 4)
3758 {
3759 odd = cur + got;
3760 got += 4;
3761 }
3762
3763 /* Compute the tentative boundaries of this range. */
3764 gad->max = cur + got;
3765 gad->min = fdcur - fd;
3766 gad->fdplt = 0;
3767
3768 /* If function descriptors took too much space, wrap some of them
3769 around. */
3770 if (gad->min < wrapmin)
3771 {
3772 gad->max += wrapmin - gad->min;
3773 gad->min = wrapmin;
3774 }
3775 /* If there is space left and we have function descriptors
3776 referenced in PLT entries that could take advantage of shorter
3777 offsets, place them here. */
3778 else if (fdplt && gad->min > wrapmin)
3779 {
3780 bfd_vma fds;
3781 if ((bfd_vma) (gad->min - wrapmin) < fdplt)
3782 fds = gad->min - wrapmin;
3783 else
3784 fds = fdplt;
3785
3786 fdplt -= fds;
3787 gad->min -= fds;
3788 gad->fdplt += fds;
3789 }
3790
3791 /* If GOT entries took too much space, wrap some of them around.
3792 This may well cause gad->min to become lower than wrapmin. This
3793 will cause a relocation overflow later on, so we don't have to
3794 report it here . */
3795 if ((bfd_vma) gad->max > wrap)
3796 {
3797 gad->min -= gad->max - wrap;
3798 gad->max = wrap;
3799 }
3800 /* If there is more space left, try to place some more function
3801 descriptors for PLT entries. */
3802 else if (fdplt && (bfd_vma) gad->max < wrap)
3803 {
3804 bfd_vma fds;
3805 if ((bfd_vma) (wrap - gad->max) < fdplt)
3806 fds = wrap - gad->max;
3807 else
3808 fds = fdplt;
3809
3810 fdplt -= fds;
3811 gad->max += fds;
3812 gad->fdplt += fds;
3813 }
3814
3815 /* If odd was initially computed as an offset past the wrap point,
3816 wrap it around. */
3817 if (odd > gad->max)
3818 odd = gad->min + odd - gad->max;
3819
3820 /* _bfinfdpic_get_got_entry() below will always wrap gad->cur if needed
3821 before returning, so do it here too. This guarantees that,
3822 should cur and fdcur meet at the wrap point, they'll both be
3823 equal to min. */
3824 if (gad->cur == gad->max)
3825 gad->cur = gad->min;
3826
3827 return odd;
3828 }
3829
3830 /* Compute the location of the next GOT entry, given the allocation
3831 data for a range. */
3832
3833 inline static bfd_signed_vma
3834 _bfinfdpic_get_got_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad)
3835 {
3836 bfd_signed_vma ret;
3837
3838 if (gad->odd)
3839 {
3840 /* If there was an odd word left behind, use it. */
3841 ret = gad->odd;
3842 gad->odd = 0;
3843 }
3844 else
3845 {
3846 /* Otherwise, use the word pointed to by cur, reserve the next
3847 as an odd word, and skip to the next pair of words, possibly
3848 wrapping around. */
3849 ret = gad->cur;
3850 gad->odd = gad->cur + 4;
3851 gad->cur += 8;
3852 if (gad->cur == gad->max)
3853 gad->cur = gad->min;
3854 }
3855
3856 return ret;
3857 }
3858
3859 /* Compute the location of the next function descriptor entry in the
3860 GOT, given the allocation data for a range. */
3861
3862 inline static bfd_signed_vma
3863 _bfinfdpic_get_fd_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad)
3864 {
3865 /* If we're at the bottom, wrap around, and only then allocate the
3866 next pair of words. */
3867 if (gad->fdcur == gad->min)
3868 gad->fdcur = gad->max;
3869 return gad->fdcur -= 8;
3870 }
3871
3872 /* Assign GOT offsets for every GOT entry and function descriptor.
3873 Doing everything in a single pass is tricky. */
3874
3875 static int
3876 _bfinfdpic_assign_got_entries (void **entryp, void *info_)
3877 {
3878 struct bfinfdpic_relocs_info *entry = *entryp;
3879 struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_;
3880
3881 if (entry->got17m4)
3882 entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4);
3883 else if (entry->gothilo)
3884 entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo);
3885
3886 if (entry->fdgot17m4)
3887 entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4);
3888 else if (entry->fdgothilo)
3889 entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo);
3890
3891 if (entry->fdgoff17m4)
3892 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4);
3893 else if (entry->plt && dinfo->got17m4.fdplt)
3894 {
3895 dinfo->got17m4.fdplt -= 8;
3896 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4);
3897 }
3898 else if (entry->plt)
3899 {
3900 dinfo->gothilo.fdplt -= 8;
3901 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo);
3902 }
3903 else if (entry->privfd)
3904 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo);
3905
3906 return 1;
3907 }
3908
3909 /* Assign GOT offsets to private function descriptors used by PLT
3910 entries (or referenced by 32-bit offsets), as well as PLT entries
3911 and lazy PLT entries. */
3912
3913 static int
3914 _bfinfdpic_assign_plt_entries (void **entryp, void *info_)
3915 {
3916 struct bfinfdpic_relocs_info *entry = *entryp;
3917 struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_;
3918
3919 /* If this symbol requires a local function descriptor, allocate
3920 one. */
3921 if (entry->privfd && entry->fd_entry == 0)
3922 {
3923 if (dinfo->got17m4.fdplt)
3924 {
3925 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4);
3926 dinfo->got17m4.fdplt -= 8;
3927 }
3928 else
3929 {
3930 BFD_ASSERT (dinfo->gothilo.fdplt);
3931 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo);
3932 dinfo->gothilo.fdplt -= 8;
3933 }
3934 }
3935
3936 if (entry->plt)
3937 {
3938 int size;
3939
3940 /* We use the section's raw size to mark the location of the
3941 next PLT entry. */
3942 entry->plt_entry = bfinfdpic_plt_section (dinfo->g.info)->size;
3943
3944 /* Figure out the length of this PLT entry based on the
3945 addressing mode we need to reach the function descriptor. */
3946 BFD_ASSERT (entry->fd_entry);
3947 if (entry->fd_entry >= -(1 << (18 - 1))
3948 && entry->fd_entry + 4 < (1 << (18 - 1)))
3949 size = 10;
3950 else
3951 size = 16;
3952
3953 bfinfdpic_plt_section (dinfo->g.info)->size += size;
3954 }
3955
3956 if (entry->lazyplt)
3957 {
3958 entry->lzplt_entry = dinfo->g.lzplt;
3959 dinfo->g.lzplt += LZPLT_NORMAL_SIZE;
3960 /* If this entry is the one that gets the resolver stub, account
3961 for the additional instruction. */
3962 if (entry->lzplt_entry % BFINFDPIC_LZPLT_BLOCK_SIZE
3963 == BFINFDPIC_LZPLT_RESOLV_LOC)
3964 dinfo->g.lzplt += LZPLT_RESOLVER_EXTRA;
3965 }
3966
3967 return 1;
3968 }
3969
3970 /* Cancel out any effects of calling _bfinfdpic_assign_got_entries and
3971 _bfinfdpic_assign_plt_entries. */
3972
3973 static int
3974 _bfinfdpic_reset_got_plt_entries (void **entryp, void *ignore ATTRIBUTE_UNUSED)
3975 {
3976 struct bfinfdpic_relocs_info *entry = *entryp;
3977
3978 entry->got_entry = 0;
3979 entry->fdgot_entry = 0;
3980 entry->fd_entry = 0;
3981 entry->plt_entry = (bfd_vma)-1;
3982 entry->lzplt_entry = (bfd_vma)-1;
3983
3984 return 1;
3985 }
3986
3987 /* Follow indirect and warning hash entries so that each got entry
3988 points to the final symbol definition. P must point to a pointer
3989 to the hash table we're traversing. Since this traversal may
3990 modify the hash table, we set this pointer to NULL to indicate
3991 we've made a potentially-destructive change to the hash table, so
3992 the traversal must be restarted. */
3993 static int
3994 _bfinfdpic_resolve_final_relocs_info (void **entryp, void *p)
3995 {
3996 struct bfinfdpic_relocs_info *entry = *entryp;
3997 htab_t *htab = p;
3998
3999 if (entry->symndx == -1)
4000 {
4001 struct elf_link_hash_entry *h = entry->d.h;
4002 struct bfinfdpic_relocs_info *oentry;
4003
4004 while (h->root.type == bfd_link_hash_indirect
4005 || h->root.type == bfd_link_hash_warning)
4006 h = (struct elf_link_hash_entry *)h->root.u.i.link;
4007
4008 if (entry->d.h == h)
4009 return 1;
4010
4011 oentry = bfinfdpic_relocs_info_for_global (*htab, 0, h, entry->addend,
4012 NO_INSERT);
4013
4014 if (oentry)
4015 {
4016 /* Merge the two entries. */
4017 bfinfdpic_pic_merge_early_relocs_info (oentry, entry);
4018 htab_clear_slot (*htab, entryp);
4019 return 1;
4020 }
4021
4022 entry->d.h = h;
4023
4024 /* If we can't find this entry with the new bfd hash, re-insert
4025 it, and get the traversal restarted. */
4026 if (! htab_find (*htab, entry))
4027 {
4028 htab_clear_slot (*htab, entryp);
4029 entryp = htab_find_slot (*htab, entry, INSERT);
4030 if (! *entryp)
4031 *entryp = entry;
4032 /* Abort the traversal, since the whole table may have
4033 moved, and leave it up to the parent to restart the
4034 process. */
4035 *(htab_t *)p = NULL;
4036 return 0;
4037 }
4038 }
4039
4040 return 1;
4041 }
4042
4043 /* Compute the total size of the GOT, the PLT, the dynamic relocations
4044 section and the rofixup section. Assign locations for GOT and PLT
4045 entries. */
4046
4047 static bfd_boolean
4048 _bfinfdpic_size_got_plt (bfd *output_bfd,
4049 struct _bfinfdpic_dynamic_got_plt_info *gpinfop)
4050 {
4051 bfd_signed_vma odd;
4052 bfd_vma limit;
4053 struct bfd_link_info *info = gpinfop->g.info;
4054 bfd *dynobj = elf_hash_table (info)->dynobj;
4055
4056 memcpy (bfinfdpic_dynamic_got_plt_info (info), &gpinfop->g,
4057 sizeof (gpinfop->g));
4058
4059 odd = 12;
4060 /* Compute the total size taken by entries in the 18-bit range,
4061 to tell how many PLT function descriptors we can bring into it
4062 without causing it to overflow. */
4063 limit = odd + gpinfop->g.got17m4 + gpinfop->g.fd17m4;
4064 if (limit < (bfd_vma)1 << 18)
4065 limit = ((bfd_vma)1 << 18) - limit;
4066 else
4067 limit = 0;
4068 if (gpinfop->g.fdplt < limit)
4069 limit = gpinfop->g.fdplt;
4070
4071 /* Determine the ranges of GOT offsets that we can use for each
4072 range of addressing modes. */
4073 odd = _bfinfdpic_compute_got_alloc_data (&gpinfop->got17m4,
4074 0,
4075 odd,
4076 16,
4077 gpinfop->g.got17m4,
4078 gpinfop->g.fd17m4,
4079 limit,
4080 (bfd_vma)1 << (18-1));
4081 odd = _bfinfdpic_compute_got_alloc_data (&gpinfop->gothilo,
4082 gpinfop->got17m4.min,
4083 odd,
4084 gpinfop->got17m4.max,
4085 gpinfop->g.gothilo,
4086 gpinfop->g.fdhilo,
4087 gpinfop->g.fdplt - gpinfop->got17m4.fdplt,
4088 (bfd_vma)1 << (32-1));
4089
4090 /* Now assign (most) GOT offsets. */
4091 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_got_entries,
4092 gpinfop);
4093
4094 bfinfdpic_got_section (info)->size = gpinfop->gothilo.max
4095 - gpinfop->gothilo.min
4096 /* If an odd word is the last word of the GOT, we don't need this
4097 word to be part of the GOT. */
4098 - (odd + 4 == gpinfop->gothilo.max ? 4 : 0);
4099 if (bfinfdpic_got_section (info)->size == 0)
4100 bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE;
4101 else if (bfinfdpic_got_section (info)->size == 12
4102 && ! elf_hash_table (info)->dynamic_sections_created)
4103 {
4104 bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE;
4105 bfinfdpic_got_section (info)->size = 0;
4106 }
4107 else
4108 {
4109 bfinfdpic_got_section (info)->contents =
4110 (bfd_byte *) bfd_zalloc (dynobj,
4111 bfinfdpic_got_section (info)->size);
4112 if (bfinfdpic_got_section (info)->contents == NULL)
4113 return FALSE;
4114 }
4115
4116 if (elf_hash_table (info)->dynamic_sections_created)
4117 /* Subtract the number of lzplt entries, since those will generate
4118 relocations in the pltrel section. */
4119 bfinfdpic_gotrel_section (info)->size =
4120 (gpinfop->g.relocs - gpinfop->g.lzplt / LZPLT_NORMAL_SIZE)
4121 * get_elf_backend_data (output_bfd)->s->sizeof_rel;
4122 else
4123 BFD_ASSERT (gpinfop->g.relocs == 0);
4124 if (bfinfdpic_gotrel_section (info)->size == 0)
4125 bfinfdpic_gotrel_section (info)->flags |= SEC_EXCLUDE;
4126 else
4127 {
4128 bfinfdpic_gotrel_section (info)->contents =
4129 (bfd_byte *) bfd_zalloc (dynobj,
4130 bfinfdpic_gotrel_section (info)->size);
4131 if (bfinfdpic_gotrel_section (info)->contents == NULL)
4132 return FALSE;
4133 }
4134
4135 bfinfdpic_gotfixup_section (info)->size = (gpinfop->g.fixups + 1) * 4;
4136 if (bfinfdpic_gotfixup_section (info)->size == 0)
4137 bfinfdpic_gotfixup_section (info)->flags |= SEC_EXCLUDE;
4138 else
4139 {
4140 bfinfdpic_gotfixup_section (info)->contents =
4141 (bfd_byte *) bfd_zalloc (dynobj,
4142 bfinfdpic_gotfixup_section (info)->size);
4143 if (bfinfdpic_gotfixup_section (info)->contents == NULL)
4144 return FALSE;
4145 }
4146
4147 if (elf_hash_table (info)->dynamic_sections_created)
4148 bfinfdpic_pltrel_section (info)->size =
4149 gpinfop->g.lzplt / LZPLT_NORMAL_SIZE * get_elf_backend_data (output_bfd)->s->sizeof_rel;
4150 if (bfinfdpic_pltrel_section (info)->size == 0)
4151 bfinfdpic_pltrel_section (info)->flags |= SEC_EXCLUDE;
4152 else
4153 {
4154 bfinfdpic_pltrel_section (info)->contents =
4155 (bfd_byte *) bfd_zalloc (dynobj,
4156 bfinfdpic_pltrel_section (info)->size);
4157 if (bfinfdpic_pltrel_section (info)->contents == NULL)
4158 return FALSE;
4159 }
4160
4161 /* Add 4 bytes for every block of at most 65535 lazy PLT entries,
4162 such that there's room for the additional instruction needed to
4163 call the resolver. Since _bfinfdpic_assign_got_entries didn't
4164 account for them, our block size is 4 bytes smaller than the real
4165 block size. */
4166 if (elf_hash_table (info)->dynamic_sections_created)
4167 {
4168 bfinfdpic_plt_section (info)->size = gpinfop->g.lzplt
4169 + ((gpinfop->g.lzplt + (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) - LZPLT_NORMAL_SIZE)
4170 / (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) * LZPLT_RESOLVER_EXTRA);
4171 }
4172
4173 /* Reset it, such that _bfinfdpic_assign_plt_entries() can use it to
4174 actually assign lazy PLT entries addresses. */
4175 gpinfop->g.lzplt = 0;
4176
4177 /* Save information that we're going to need to generate GOT and PLT
4178 entries. */
4179 bfinfdpic_got_initial_offset (info) = -gpinfop->gothilo.min;
4180
4181 if (get_elf_backend_data (output_bfd)->want_got_sym)
4182 elf_hash_table (info)->hgot->root.u.def.value
4183 = bfinfdpic_got_initial_offset (info);
4184
4185 if (elf_hash_table (info)->dynamic_sections_created)
4186 bfinfdpic_plt_initial_offset (info) =
4187 bfinfdpic_plt_section (info)->size;
4188
4189 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_plt_entries,
4190 gpinfop);
4191
4192 /* Allocate the PLT section contents only after
4193 _bfinfdpic_assign_plt_entries has a chance to add the size of the
4194 non-lazy PLT entries. */
4195 if (bfinfdpic_plt_section (info)->size == 0)
4196 bfinfdpic_plt_section (info)->flags |= SEC_EXCLUDE;
4197 else
4198 {
4199 bfinfdpic_plt_section (info)->contents =
4200 (bfd_byte *) bfd_zalloc (dynobj,
4201 bfinfdpic_plt_section (info)->size);
4202 if (bfinfdpic_plt_section (info)->contents == NULL)
4203 return FALSE;
4204 }
4205
4206 return TRUE;
4207 }
4208
4209 /* Set the sizes of the dynamic sections. */
4210
4211 static bfd_boolean
4212 elf32_bfinfdpic_size_dynamic_sections (bfd *output_bfd,
4213 struct bfd_link_info *info)
4214 {
4215 struct elf_link_hash_table *htab;
4216 bfd *dynobj;
4217 asection *s;
4218 struct _bfinfdpic_dynamic_got_plt_info gpinfo;
4219
4220 htab = elf_hash_table (info);
4221 dynobj = htab->dynobj;
4222 BFD_ASSERT (dynobj != NULL);
4223
4224 if (htab->dynamic_sections_created)
4225 {
4226 /* Set the contents of the .interp section to the interpreter. */
4227 if (info->executable)
4228 {
4229 s = bfd_get_section_by_name (dynobj, ".interp");
4230 BFD_ASSERT (s != NULL);
4231 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
4232 s->contents = (bfd_byte *) ELF_DYNAMIC_INTERPRETER;
4233 }
4234 }
4235
4236 memset (&gpinfo, 0, sizeof (gpinfo));
4237 gpinfo.g.info = info;
4238
4239 for (;;)
4240 {
4241 htab_t relocs = bfinfdpic_relocs_info (info);
4242
4243 htab_traverse (relocs, _bfinfdpic_resolve_final_relocs_info, &relocs);
4244
4245 if (relocs == bfinfdpic_relocs_info (info))
4246 break;
4247 }
4248
4249 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_count_got_plt_entries,
4250 &gpinfo.g);
4251
4252 /* Allocate space to save the summary information, we're going to
4253 use it if we're doing relaxations. */
4254 bfinfdpic_dynamic_got_plt_info (info) = bfd_alloc (dynobj, sizeof (gpinfo.g));
4255
4256 if (!_bfinfdpic_size_got_plt (output_bfd, &gpinfo))
4257 return FALSE;
4258
4259 if (elf_hash_table (info)->dynamic_sections_created)
4260 {
4261 if (bfinfdpic_got_section (info)->size)
4262 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0))
4263 return FALSE;
4264
4265 if (bfinfdpic_pltrel_section (info)->size)
4266 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0)
4267 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_REL)
4268 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0))
4269 return FALSE;
4270
4271 if (bfinfdpic_gotrel_section (info)->size)
4272 if (!_bfd_elf_add_dynamic_entry (info, DT_REL, 0)
4273 || !_bfd_elf_add_dynamic_entry (info, DT_RELSZ, 0)
4274 || !_bfd_elf_add_dynamic_entry (info, DT_RELENT,
4275 sizeof (Elf32_External_Rel)))
4276 return FALSE;
4277 }
4278
4279 s = bfd_get_section_by_name (dynobj, ".dynbss");
4280 if (s && s->size == 0)
4281 s->flags |= SEC_EXCLUDE;
4282
4283 s = bfd_get_section_by_name (dynobj, ".rela.bss");
4284 if (s && s->size == 0)
4285 s->flags |= SEC_EXCLUDE;
4286
4287 return TRUE;
4288 }
4289
4290 static bfd_boolean
4291 elf32_bfinfdpic_always_size_sections (bfd *output_bfd,
4292 struct bfd_link_info *info)
4293 {
4294 if (!info->relocatable)
4295 {
4296 struct elf_link_hash_entry *h;
4297
4298 /* Force a PT_GNU_STACK segment to be created. */
4299 if (! elf_tdata (output_bfd)->stack_flags)
4300 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
4301
4302 /* Define __stacksize if it's not defined yet. */
4303 h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize",
4304 FALSE, FALSE, FALSE);
4305 if (! h || h->root.type != bfd_link_hash_defined
4306 || h->type != STT_OBJECT
4307 || !h->def_regular)
4308 {
4309 struct bfd_link_hash_entry *bh = NULL;
4310
4311 if (!(_bfd_generic_link_add_one_symbol
4312 (info, output_bfd, "__stacksize",
4313 BSF_GLOBAL, bfd_abs_section_ptr, DEFAULT_STACK_SIZE,
4314 (const char *) NULL, FALSE,
4315 get_elf_backend_data (output_bfd)->collect, &bh)))
4316 return FALSE;
4317
4318 h = (struct elf_link_hash_entry *) bh;
4319 h->def_regular = 1;
4320 h->type = STT_OBJECT;
4321 }
4322 }
4323
4324 return TRUE;
4325 }
4326
4327 /* Check whether any of the relocations was optimized away, and
4328 subtract it from the relocation or fixup count. */
4329 static bfd_boolean
4330 _bfinfdpic_check_discarded_relocs (bfd *abfd, asection *sec,
4331 struct bfd_link_info *info,
4332
4333 bfd_boolean *changed)
4334 {
4335 Elf_Internal_Shdr *symtab_hdr;
4336 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
4337 Elf_Internal_Rela *rel, *erel;
4338
4339 if ((sec->flags & SEC_RELOC) == 0
4340 || sec->reloc_count == 0)
4341 return TRUE;
4342
4343 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4344 sym_hashes = elf_sym_hashes (abfd);
4345 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
4346 if (!elf_bad_symtab (abfd))
4347 sym_hashes_end -= symtab_hdr->sh_info;
4348
4349 rel = elf_section_data (sec)->relocs;
4350
4351 /* Now examine each relocation. */
4352 for (erel = rel + sec->reloc_count; rel < erel; rel++)
4353 {
4354 struct elf_link_hash_entry *h;
4355 unsigned long r_symndx;
4356 struct bfinfdpic_relocs_info *picrel;
4357 struct _bfinfdpic_dynamic_got_info *dinfo;
4358
4359 if (ELF32_R_TYPE (rel->r_info) != R_BFIN_BYTE4_DATA
4360 && ELF32_R_TYPE (rel->r_info) != R_BFIN_FUNCDESC)
4361 continue;
4362
4363 if (_bfd_elf_section_offset (sec->output_section->owner,
4364 info, sec, rel->r_offset)
4365 != (bfd_vma)-1)
4366 continue;
4367
4368 r_symndx = ELF32_R_SYM (rel->r_info);
4369 if (r_symndx < symtab_hdr->sh_info)
4370 h = NULL;
4371 else
4372 {
4373 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
4374 while (h->root.type == bfd_link_hash_indirect
4375 || h->root.type == bfd_link_hash_warning)
4376 h = (struct elf_link_hash_entry *)h->root.u.i.link;
4377 }
4378
4379 if (h != NULL)
4380 picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info),
4381 abfd, h,
4382 rel->r_addend, NO_INSERT);
4383 else
4384 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info (info),
4385 abfd, r_symndx,
4386 rel->r_addend, NO_INSERT);
4387
4388 if (! picrel)
4389 return FALSE;
4390
4391 *changed = TRUE;
4392 dinfo = bfinfdpic_dynamic_got_plt_info (info);
4393
4394 _bfinfdpic_count_relocs_fixups (picrel, dinfo, TRUE);
4395 if (ELF32_R_TYPE (rel->r_info) == R_BFIN_BYTE4_DATA)
4396 picrel->relocs32--;
4397 else /* we know (ELF32_R_TYPE (rel->r_info) == R_BFIN_FUNCDESC) */
4398 picrel->relocsfd--;
4399 _bfinfdpic_count_relocs_fixups (picrel, dinfo, FALSE);
4400 }
4401
4402 return TRUE;
4403 }
4404
4405 static bfd_boolean
4406 bfinfdpic_elf_discard_info (bfd *ibfd,
4407 struct elf_reloc_cookie *cookie ATTRIBUTE_UNUSED,
4408 struct bfd_link_info *info)
4409 {
4410 bfd_boolean changed = FALSE;
4411 asection *s;
4412 bfd *obfd = NULL;
4413
4414 /* Account for relaxation of .eh_frame section. */
4415 for (s = ibfd->sections; s; s = s->next)
4416 if (s->sec_info_type == ELF_INFO_TYPE_EH_FRAME)
4417 {
4418 if (!_bfinfdpic_check_discarded_relocs (ibfd, s, info, &changed))
4419 return FALSE;
4420 obfd = s->output_section->owner;
4421 }
4422
4423 if (changed)
4424 {
4425 struct _bfinfdpic_dynamic_got_plt_info gpinfo;
4426
4427 memset (&gpinfo, 0, sizeof (gpinfo));
4428 memcpy (&gpinfo.g, bfinfdpic_dynamic_got_plt_info (info),
4429 sizeof (gpinfo.g));
4430
4431 /* Clear GOT and PLT assignments. */
4432 htab_traverse (bfinfdpic_relocs_info (info),
4433 _bfinfdpic_reset_got_plt_entries,
4434 NULL);
4435
4436 if (!_bfinfdpic_size_got_plt (obfd, &gpinfo))
4437 return FALSE;
4438 }
4439
4440 return TRUE;
4441 }
4442
4443 static bfd_boolean
4444 elf32_bfinfdpic_modify_program_headers (bfd *output_bfd,
4445 struct bfd_link_info *info)
4446 {
4447 struct elf_obj_tdata *tdata = elf_tdata (output_bfd);
4448 struct elf_segment_map *m;
4449 Elf_Internal_Phdr *p;
4450
4451 /* objcopy and strip preserve what's already there using
4452 elf32_bfinfdpic_copy_private_bfd_data (). */
4453 if (! info)
4454 return TRUE;
4455
4456 for (p = tdata->phdr, m = tdata->segment_map; m != NULL; m = m->next, p++)
4457 if (m->p_type == PT_GNU_STACK)
4458 break;
4459
4460 if (m)
4461 {
4462 struct elf_link_hash_entry *h;
4463
4464 /* Obtain the pointer to the __stacksize symbol. */
4465 h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize",
4466 FALSE, FALSE, FALSE);
4467 if (h)
4468 {
4469 while (h->root.type == bfd_link_hash_indirect
4470 || h->root.type == bfd_link_hash_warning)
4471 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4472 BFD_ASSERT (h->root.type == bfd_link_hash_defined);
4473 }
4474
4475 /* Set the header p_memsz from the symbol value. We
4476 intentionally ignore the symbol section. */
4477 if (h && h->root.type == bfd_link_hash_defined)
4478 p->p_memsz = h->root.u.def.value;
4479 else
4480 p->p_memsz = DEFAULT_STACK_SIZE;
4481
4482 p->p_align = 8;
4483 }
4484
4485 return TRUE;
4486 }
4487
4488 static bfd_boolean
4489 elf32_bfinfdpic_finish_dynamic_sections (bfd *output_bfd,
4490 struct bfd_link_info *info)
4491 {
4492 bfd *dynobj;
4493 asection *sdyn;
4494
4495 dynobj = elf_hash_table (info)->dynobj;
4496
4497 if (bfinfdpic_got_section (info))
4498 {
4499 BFD_ASSERT (bfinfdpic_gotrel_section (info)->size
4500 == (bfinfdpic_gotrel_section (info)->reloc_count
4501 * sizeof (Elf32_External_Rel)));
4502
4503 if (bfinfdpic_gotfixup_section (info))
4504 {
4505 struct elf_link_hash_entry *hgot = elf_hash_table (info)->hgot;
4506 bfd_vma got_value = hgot->root.u.def.value
4507 + hgot->root.u.def.section->output_section->vma
4508 + hgot->root.u.def.section->output_offset;
4509
4510 _bfinfdpic_add_rofixup (output_bfd, bfinfdpic_gotfixup_section (info),
4511 got_value, 0);
4512
4513 if (bfinfdpic_gotfixup_section (info)->size
4514 != (bfinfdpic_gotfixup_section (info)->reloc_count * 4))
4515 {
4516 (*_bfd_error_handler)
4517 ("LINKER BUG: .rofixup section size mismatch");
4518 return FALSE;
4519 }
4520 }
4521 }
4522 if (elf_hash_table (info)->dynamic_sections_created)
4523 {
4524 BFD_ASSERT (bfinfdpic_pltrel_section (info)->size
4525 == (bfinfdpic_pltrel_section (info)->reloc_count
4526 * sizeof (Elf32_External_Rel)));
4527 }
4528
4529 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4530
4531 if (elf_hash_table (info)->dynamic_sections_created)
4532 {
4533 Elf32_External_Dyn * dyncon;
4534 Elf32_External_Dyn * dynconend;
4535
4536 BFD_ASSERT (sdyn != NULL);
4537
4538 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4539 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4540
4541 for (; dyncon < dynconend; dyncon++)
4542 {
4543 Elf_Internal_Dyn dyn;
4544
4545 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4546
4547 switch (dyn.d_tag)
4548 {
4549 default:
4550 break;
4551
4552 case DT_PLTGOT:
4553 dyn.d_un.d_ptr = bfinfdpic_got_section (info)->output_section->vma
4554 + bfinfdpic_got_section (info)->output_offset
4555 + bfinfdpic_got_initial_offset (info);
4556 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4557 break;
4558
4559 case DT_JMPREL:
4560 dyn.d_un.d_ptr = bfinfdpic_pltrel_section (info)
4561 ->output_section->vma
4562 + bfinfdpic_pltrel_section (info)->output_offset;
4563 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4564 break;
4565
4566 case DT_PLTRELSZ:
4567 dyn.d_un.d_val = bfinfdpic_pltrel_section (info)->size;
4568 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4569 break;
4570 }
4571 }
4572 }
4573
4574 return TRUE;
4575 }
4576
4577 /* Adjust a symbol defined by a dynamic object and referenced by a
4578 regular object. */
4579
4580 static bfd_boolean
4581 elf32_bfinfdpic_adjust_dynamic_symbol
4582 (struct bfd_link_info *info,
4583 struct elf_link_hash_entry *h)
4584 {
4585 bfd * dynobj;
4586
4587 dynobj = elf_hash_table (info)->dynobj;
4588
4589 /* Make sure we know what is going on here. */
4590 BFD_ASSERT (dynobj != NULL
4591 && (h->u.weakdef != NULL
4592 || (h->def_dynamic
4593 && h->ref_regular
4594 && !h->def_regular)));
4595
4596 /* If this is a weak symbol, and there is a real definition, the
4597 processor independent code will have arranged for us to see the
4598 real definition first, and we can just use the same value. */
4599 if (h->u.weakdef != NULL)
4600 {
4601 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
4602 || h->u.weakdef->root.type == bfd_link_hash_defweak);
4603 h->root.u.def.section = h->u.weakdef->root.u.def.section;
4604 h->root.u.def.value = h->u.weakdef->root.u.def.value;
4605 }
4606
4607 return TRUE;
4608 }
4609
4610 /* Perform any actions needed for dynamic symbols. */
4611
4612 static bfd_boolean
4613 elf32_bfinfdpic_finish_dynamic_symbol
4614 (bfd *output_bfd ATTRIBUTE_UNUSED,
4615 struct bfd_link_info *info ATTRIBUTE_UNUSED,
4616 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
4617 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4618 {
4619 return TRUE;
4620 }
4621
4622 /* Decide whether to attempt to turn absptr or lsda encodings in
4623 shared libraries into pcrel within the given input section. */
4624
4625 static bfd_boolean
4626 bfinfdpic_elf_use_relative_eh_frame
4627 (bfd *input_bfd ATTRIBUTE_UNUSED,
4628 struct bfd_link_info *info ATTRIBUTE_UNUSED,
4629 asection *eh_frame_section ATTRIBUTE_UNUSED)
4630 {
4631 /* We can't use PC-relative encodings in FDPIC binaries, in general. */
4632 return FALSE;
4633 }
4634
4635 /* Adjust the contents of an eh_frame_hdr section before they're output. */
4636
4637 static bfd_byte
4638 bfinfdpic_elf_encode_eh_address (bfd *abfd,
4639 struct bfd_link_info *info,
4640 asection *osec, bfd_vma offset,
4641 asection *loc_sec, bfd_vma loc_offset,
4642 bfd_vma *encoded)
4643 {
4644 struct elf_link_hash_entry *h;
4645
4646 h = elf_hash_table (info)->hgot;
4647 BFD_ASSERT (h && h->root.type == bfd_link_hash_defined);
4648
4649 if (! h || (_bfinfdpic_osec_to_segment (abfd, osec)
4650 == _bfinfdpic_osec_to_segment (abfd, loc_sec->output_section)))
4651 return _bfd_elf_encode_eh_address (abfd, info, osec, offset,
4652 loc_sec, loc_offset, encoded);
4653
4654 BFD_ASSERT (_bfinfdpic_osec_to_segment (abfd, osec)
4655 == (_bfinfdpic_osec_to_segment
4656 (abfd, h->root.u.def.section->output_section)));
4657
4658 *encoded = osec->vma + offset
4659 - (h->root.u.def.value
4660 + h->root.u.def.section->output_section->vma
4661 + h->root.u.def.section->output_offset);
4662
4663 return DW_EH_PE_datarel | DW_EH_PE_sdata4;
4664 }
4665
4666
4667
4668 /* Look through the relocs for a section during the first phase.
4669
4670 Besides handling virtual table relocs for gc, we have to deal with
4671 all sorts of PIC-related relocations. We describe below the
4672 general plan on how to handle such relocations, even though we only
4673 collect information at this point, storing them in hash tables for
4674 perusal of later passes.
4675
4676 32 relocations are propagated to the linker output when creating
4677 position-independent output. LO16 and HI16 relocations are not
4678 supposed to be encountered in this case.
4679
4680 LABEL16 should always be resolvable by the linker, since it's only
4681 used by branches.
4682
4683 LABEL24, on the other hand, is used by calls. If it turns out that
4684 the target of a call is a dynamic symbol, a PLT entry must be
4685 created for it, which triggers the creation of a private function
4686 descriptor and, unless lazy binding is disabled, a lazy PLT entry.
4687
4688 GPREL relocations require the referenced symbol to be in the same
4689 segment as _gp, but this can only be checked later.
4690
4691 All GOT, GOTOFF and FUNCDESC relocations require a .got section to
4692 exist. LABEL24 might as well, since it may require a PLT entry,
4693 that will require a got.
4694
4695 Non-FUNCDESC GOT relocations require a GOT entry to be created
4696 regardless of whether the symbol is dynamic. However, since a
4697 global symbol that turns out to not be exported may have the same
4698 address of a non-dynamic symbol, we don't assign GOT entries at
4699 this point, such that we can share them in this case. A relocation
4700 for the GOT entry always has to be created, be it to offset a
4701 private symbol by the section load address, be it to get the symbol
4702 resolved dynamically.
4703
4704 FUNCDESC GOT relocations require a GOT entry to be created, and
4705 handled as if a FUNCDESC relocation was applied to the GOT entry in
4706 an object file.
4707
4708 FUNCDESC relocations referencing a symbol that turns out to NOT be
4709 dynamic cause a private function descriptor to be created. The
4710 FUNCDESC relocation then decays to a 32 relocation that points at
4711 the private descriptor. If the symbol is dynamic, the FUNCDESC
4712 relocation is propagated to the linker output, such that the
4713 dynamic linker creates the canonical descriptor, pointing to the
4714 dynamically-resolved definition of the function.
4715
4716 Non-FUNCDESC GOTOFF relocations must always refer to non-dynamic
4717 symbols that are assigned to the same segment as the GOT, but we
4718 can only check this later, after we know the complete set of
4719 symbols defined and/or exported.
4720
4721 FUNCDESC GOTOFF relocations require a function descriptor to be
4722 created and, unless lazy binding is disabled or the symbol is not
4723 dynamic, a lazy PLT entry. Since we can't tell at this point
4724 whether a symbol is going to be dynamic, we have to decide later
4725 whether to create a lazy PLT entry or bind the descriptor directly
4726 to the private function.
4727
4728 FUNCDESC_VALUE relocations are not supposed to be present in object
4729 files, but they may very well be simply propagated to the linker
4730 output, since they have no side effect.
4731
4732
4733 A function descriptor always requires a FUNCDESC_VALUE relocation.
4734 Whether it's in .plt.rel or not depends on whether lazy binding is
4735 enabled and on whether the referenced symbol is dynamic.
4736
4737 The existence of a lazy PLT requires the resolverStub lazy PLT
4738 entry to be present.
4739
4740
4741 As for assignment of GOT, PLT and lazy PLT entries, and private
4742 descriptors, we might do them all sequentially, but we can do
4743 better than that. For example, we can place GOT entries and
4744 private function descriptors referenced using 12-bit operands
4745 closer to the PIC register value, such that these relocations don't
4746 overflow. Those that are only referenced with LO16 relocations
4747 could come next, but we may as well place PLT-required function
4748 descriptors in the 12-bit range to make them shorter. Symbols
4749 referenced with LO16/HI16 may come next, but we may place
4750 additional function descriptors in the 16-bit range if we can
4751 reliably tell that we've already placed entries that are ever
4752 referenced with only LO16. PLT entries are therefore generated as
4753 small as possible, while not introducing relocation overflows in
4754 GOT or FUNCDESC_GOTOFF relocations. Lazy PLT entries could be
4755 generated before or after PLT entries, but not intermingled with
4756 them, such that we can have more lazy PLT entries in range for a
4757 branch to the resolverStub. The resolverStub should be emitted at
4758 the most distant location from the first lazy PLT entry such that
4759 it's still in range for a branch, or closer, if there isn't a need
4760 for so many lazy PLT entries. Additional lazy PLT entries may be
4761 emitted after the resolverStub, as long as branches are still in
4762 range. If the branch goes out of range, longer lazy PLT entries
4763 are emitted.
4764
4765 We could further optimize PLT and lazy PLT entries by giving them
4766 priority in assignment to closer-to-gr17 locations depending on the
4767 number of occurrences of references to them (assuming a function
4768 that's called more often is more important for performance, so its
4769 PLT entry should be faster), or taking hints from the compiler.
4770 Given infinite time and money... :-) */
4771
4772 static bfd_boolean
4773 bfinfdpic_check_relocs (bfd *abfd, struct bfd_link_info *info,
4774 asection *sec, const Elf_Internal_Rela *relocs)
4775 {
4776 Elf_Internal_Shdr *symtab_hdr;
4777 struct elf_link_hash_entry **sym_hashes;
4778 const Elf_Internal_Rela *rel;
4779 const Elf_Internal_Rela *rel_end;
4780 bfd *dynobj;
4781 struct bfinfdpic_relocs_info *picrel;
4782
4783 if (info->relocatable)
4784 return TRUE;
4785
4786 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4787 sym_hashes = elf_sym_hashes (abfd);
4788
4789 dynobj = elf_hash_table (info)->dynobj;
4790 rel_end = relocs + sec->reloc_count;
4791 for (rel = relocs; rel < rel_end; rel++)
4792 {
4793 struct elf_link_hash_entry *h;
4794 unsigned long r_symndx;
4795
4796 r_symndx = ELF32_R_SYM (rel->r_info);
4797 if (r_symndx < symtab_hdr->sh_info)
4798 h = NULL;
4799 else
4800 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
4801
4802 switch (ELF32_R_TYPE (rel->r_info))
4803 {
4804 case R_BFIN_GOT17M4:
4805 case R_BFIN_GOTHI:
4806 case R_BFIN_GOTLO:
4807 case R_BFIN_FUNCDESC_GOT17M4:
4808 case R_BFIN_FUNCDESC_GOTHI:
4809 case R_BFIN_FUNCDESC_GOTLO:
4810 case R_BFIN_GOTOFF17M4:
4811 case R_BFIN_GOTOFFHI:
4812 case R_BFIN_GOTOFFLO:
4813 case R_BFIN_FUNCDESC_GOTOFF17M4:
4814 case R_BFIN_FUNCDESC_GOTOFFHI:
4815 case R_BFIN_FUNCDESC_GOTOFFLO:
4816 case R_BFIN_FUNCDESC:
4817 case R_BFIN_FUNCDESC_VALUE:
4818 if (! IS_FDPIC (abfd))
4819 goto bad_reloc;
4820 /* Fall through. */
4821 case R_BFIN_PCREL24:
4822 case R_BFIN_PCREL24_JUMP_L:
4823 case R_BFIN_BYTE4_DATA:
4824 if (IS_FDPIC (abfd) && ! dynobj)
4825 {
4826 elf_hash_table (info)->dynobj = dynobj = abfd;
4827 if (! _bfin_create_got_section (abfd, info))
4828 return FALSE;
4829 }
4830 if (! IS_FDPIC (abfd))
4831 {
4832 picrel = NULL;
4833 break;
4834 }
4835 if (h != NULL)
4836 {
4837 if (h->dynindx == -1)
4838 switch (ELF_ST_VISIBILITY (h->other))
4839 {
4840 case STV_INTERNAL:
4841 case STV_HIDDEN:
4842 break;
4843 default:
4844 bfd_elf_link_record_dynamic_symbol (info, h);
4845 break;
4846 }
4847 picrel
4848 = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info),
4849 abfd, h,
4850 rel->r_addend, INSERT);
4851 }
4852 else
4853 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info
4854 (info), abfd, r_symndx,
4855 rel->r_addend, INSERT);
4856 if (! picrel)
4857 return FALSE;
4858 break;
4859
4860 default:
4861 picrel = NULL;
4862 break;
4863 }
4864
4865 switch (ELF32_R_TYPE (rel->r_info))
4866 {
4867 case R_BFIN_PCREL24:
4868 case R_BFIN_PCREL24_JUMP_L:
4869 if (IS_FDPIC (abfd))
4870 picrel->call++;
4871 break;
4872
4873 case R_BFIN_FUNCDESC_VALUE:
4874 picrel->relocsfdv++;
4875 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
4876 picrel->relocs32--;
4877 /* Fall through. */
4878
4879 case R_BFIN_BYTE4_DATA:
4880 if (! IS_FDPIC (abfd))
4881 break;
4882
4883 picrel->sym++;
4884 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
4885 picrel->relocs32++;
4886 break;
4887
4888 case R_BFIN_GOT17M4:
4889 picrel->got17m4++;
4890 break;
4891
4892 case R_BFIN_GOTHI:
4893 case R_BFIN_GOTLO:
4894 picrel->gothilo++;
4895 break;
4896
4897 case R_BFIN_FUNCDESC_GOT17M4:
4898 picrel->fdgot17m4++;
4899 break;
4900
4901 case R_BFIN_FUNCDESC_GOTHI:
4902 case R_BFIN_FUNCDESC_GOTLO:
4903 picrel->fdgothilo++;
4904 break;
4905
4906 case R_BFIN_GOTOFF17M4:
4907 case R_BFIN_GOTOFFHI:
4908 case R_BFIN_GOTOFFLO:
4909 picrel->gotoff++;
4910 break;
4911
4912 case R_BFIN_FUNCDESC_GOTOFF17M4:
4913 picrel->fdgoff17m4++;
4914 break;
4915
4916 case R_BFIN_FUNCDESC_GOTOFFHI:
4917 case R_BFIN_FUNCDESC_GOTOFFLO:
4918 picrel->fdgoffhilo++;
4919 break;
4920
4921 case R_BFIN_FUNCDESC:
4922 picrel->fd++;
4923 picrel->relocsfd++;
4924 break;
4925
4926 /* This relocation describes the C++ object vtable hierarchy.
4927 Reconstruct it for later use during GC. */
4928 case R_BFIN_GNU_VTINHERIT:
4929 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
4930 return FALSE;
4931 break;
4932
4933 /* This relocation describes which C++ vtable entries are actually
4934 used. Record for later use during GC. */
4935 case R_BFIN_GNU_VTENTRY:
4936 BFD_ASSERT (h != NULL);
4937 if (h != NULL
4938 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
4939 return FALSE;
4940 break;
4941
4942 case R_BFIN_HUIMM16:
4943 case R_BFIN_LUIMM16:
4944 case R_BFIN_PCREL12_JUMP_S:
4945 case R_BFIN_PCREL10:
4946 break;
4947
4948 default:
4949 bad_reloc:
4950 (*_bfd_error_handler)
4951 (_("%B: unsupported relocation type %i"),
4952 abfd, ELF32_R_TYPE (rel->r_info));
4953 return FALSE;
4954 }
4955 }
4956
4957 return TRUE;
4958 }
4959
4960 /* Set the right machine number for a Blackfin ELF file. */
4961
4962 static bfd_boolean
4963 elf32_bfin_object_p (bfd *abfd)
4964 {
4965 bfd_default_set_arch_mach (abfd, bfd_arch_bfin, 0);
4966 return (((elf_elfheader (abfd)->e_flags & EF_BFIN_FDPIC) != 0)
4967 == (IS_FDPIC (abfd)));
4968 }
4969
4970 static bfd_boolean
4971 elf32_bfin_set_private_flags (bfd * abfd, flagword flags)
4972 {
4973 elf_elfheader (abfd)->e_flags = flags;
4974 elf_flags_init (abfd) = TRUE;
4975 return TRUE;
4976 }
4977
4978 /* Copy backend specific data from one object module to another. */
4979
4980 static bfd_boolean
4981 bfin_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
4982 {
4983 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
4984 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
4985 return TRUE;
4986
4987 BFD_ASSERT (!elf_flags_init (obfd)
4988 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
4989
4990 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
4991 elf_flags_init (obfd) = TRUE;
4992
4993 /* Copy object attributes. */
4994 _bfd_elf_copy_obj_attributes (ibfd, obfd);
4995
4996 return TRUE;
4997 }
4998
4999 static bfd_boolean
5000 elf32_bfinfdpic_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
5001 {
5002 unsigned i;
5003
5004 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
5005 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
5006 return TRUE;
5007
5008 if (! bfin_elf_copy_private_bfd_data (ibfd, obfd))
5009 return FALSE;
5010
5011 if (! elf_tdata (ibfd) || ! elf_tdata (ibfd)->phdr
5012 || ! elf_tdata (obfd) || ! elf_tdata (obfd)->phdr)
5013 return TRUE;
5014
5015 /* Copy the stack size. */
5016 for (i = 0; i < elf_elfheader (ibfd)->e_phnum; i++)
5017 if (elf_tdata (ibfd)->phdr[i].p_type == PT_GNU_STACK)
5018 {
5019 Elf_Internal_Phdr *iphdr = &elf_tdata (ibfd)->phdr[i];
5020
5021 for (i = 0; i < elf_elfheader (obfd)->e_phnum; i++)
5022 if (elf_tdata (obfd)->phdr[i].p_type == PT_GNU_STACK)
5023 {
5024 memcpy (&elf_tdata (obfd)->phdr[i], iphdr, sizeof (*iphdr));
5025
5026 /* Rewrite the phdrs, since we're only called after they
5027 were first written. */
5028 if (bfd_seek (obfd, (bfd_signed_vma) get_elf_backend_data (obfd)
5029 ->s->sizeof_ehdr, SEEK_SET) != 0
5030 || get_elf_backend_data (obfd)->s
5031 ->write_out_phdrs (obfd, elf_tdata (obfd)->phdr,
5032 elf_elfheader (obfd)->e_phnum) != 0)
5033 return FALSE;
5034 break;
5035 }
5036
5037 break;
5038 }
5039
5040 return TRUE;
5041 }
5042
5043
5044 /* Display the flags field. */
5045 static bfd_boolean
5046 elf32_bfin_print_private_bfd_data (bfd * abfd, PTR ptr)
5047 {
5048 FILE *file = (FILE *) ptr;
5049 flagword flags;
5050
5051 BFD_ASSERT (abfd != NULL && ptr != NULL);
5052
5053 /* Print normal ELF private data. */
5054 _bfd_elf_print_private_bfd_data (abfd, ptr);
5055
5056 flags = elf_elfheader (abfd)->e_flags;
5057
5058 /* xgettext:c-format */
5059 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
5060
5061 if (flags & EF_BFIN_PIC)
5062 fprintf (file, " -fpic");
5063
5064 if (flags & EF_BFIN_FDPIC)
5065 fprintf (file, " -mfdpic");
5066
5067 fputc ('\n', file);
5068
5069 return TRUE;
5070 }
5071
5072 /* Merge backend specific data from an object file to the output
5073 object file when linking. */
5074
5075 static bfd_boolean
5076 elf32_bfin_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
5077 {
5078 flagword old_flags, new_flags;
5079 bfd_boolean error = FALSE;
5080
5081 new_flags = elf_elfheader (ibfd)->e_flags;
5082 old_flags = elf_elfheader (obfd)->e_flags;
5083
5084 if (new_flags & EF_BFIN_FDPIC)
5085 new_flags &= ~EF_BFIN_PIC;
5086
5087 #ifndef DEBUG
5088 if (0)
5089 #endif
5090 (*_bfd_error_handler) ("old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s, filename = %s",
5091 old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no",
5092 bfd_get_filename (ibfd));
5093
5094 if (!elf_flags_init (obfd)) /* First call, no flags set. */
5095 {
5096 elf_flags_init (obfd) = TRUE;
5097 elf_elfheader (obfd)->e_flags = new_flags;
5098 }
5099
5100 if (((new_flags & EF_BFIN_FDPIC) == 0) != (! IS_FDPIC (obfd)))
5101 {
5102 error = TRUE;
5103 if (IS_FDPIC (obfd))
5104 (*_bfd_error_handler)
5105 (_("%s: cannot link non-fdpic object file into fdpic executable"),
5106 bfd_get_filename (ibfd));
5107 else
5108 (*_bfd_error_handler)
5109 (_("%s: cannot link fdpic object file into non-fdpic executable"),
5110 bfd_get_filename (ibfd));
5111 }
5112
5113 if (error)
5114 bfd_set_error (bfd_error_bad_value);
5115
5116 return !error;
5117 }
5118 \f
5119 /* bfin ELF linker hash entry. */
5120
5121 struct bfin_link_hash_entry
5122 {
5123 struct elf_link_hash_entry root;
5124
5125 /* Number of PC relative relocs copied for this symbol. */
5126 struct bfin_pcrel_relocs_copied *pcrel_relocs_copied;
5127 };
5128
5129 /* bfin ELF linker hash table. */
5130
5131 struct bfin_link_hash_table
5132 {
5133 struct elf_link_hash_table root;
5134
5135 /* Small local sym cache. */
5136 struct sym_cache sym_cache;
5137 };
5138
5139 #define bfin_hash_entry(ent) ((struct bfin_link_hash_entry *) (ent))
5140
5141 static struct bfd_hash_entry *
5142 bfin_link_hash_newfunc (struct bfd_hash_entry *entry,
5143 struct bfd_hash_table *table, const char *string)
5144 {
5145 struct bfd_hash_entry *ret = entry;
5146
5147 /* Allocate the structure if it has not already been allocated by a
5148 subclass. */
5149 if (ret == NULL)
5150 ret = bfd_hash_allocate (table, sizeof (struct bfin_link_hash_entry));
5151 if (ret == NULL)
5152 return ret;
5153
5154 /* Call the allocation method of the superclass. */
5155 ret = _bfd_elf_link_hash_newfunc (ret, table, string);
5156 if (ret != NULL)
5157 bfin_hash_entry (ret)->pcrel_relocs_copied = NULL;
5158
5159 return ret;
5160 }
5161
5162 /* Create an bfin ELF linker hash table. */
5163
5164 static struct bfd_link_hash_table *
5165 bfin_link_hash_table_create (bfd * abfd)
5166 {
5167 struct bfin_link_hash_table *ret;
5168 bfd_size_type amt = sizeof (struct bfin_link_hash_table);
5169
5170 ret = bfd_zalloc (abfd, amt);
5171 if (ret == NULL)
5172 return NULL;
5173
5174 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
5175 bfin_link_hash_newfunc,
5176 sizeof (struct elf_link_hash_entry),
5177 BFIN_ELF_DATA))
5178 {
5179 free (ret);
5180 return NULL;
5181 }
5182
5183 ret->sym_cache.abfd = NULL;
5184
5185 return &ret->root.root;
5186 }
5187
5188 /* The size in bytes of an entry in the procedure linkage table. */
5189
5190 /* Finish up the dynamic sections. */
5191
5192 static bfd_boolean
5193 bfin_finish_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED,
5194 struct bfd_link_info *info)
5195 {
5196 bfd *dynobj;
5197 asection *sdyn;
5198
5199 dynobj = elf_hash_table (info)->dynobj;
5200
5201 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
5202
5203 if (elf_hash_table (info)->dynamic_sections_created)
5204 {
5205 Elf32_External_Dyn *dyncon, *dynconend;
5206
5207 BFD_ASSERT (sdyn != NULL);
5208
5209 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5210 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5211 for (; dyncon < dynconend; dyncon++)
5212 {
5213 Elf_Internal_Dyn dyn;
5214
5215 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5216
5217 }
5218
5219 }
5220 return TRUE;
5221 }
5222
5223 /* Finish up dynamic symbol handling. We set the contents of various
5224 dynamic sections here. */
5225
5226 static bfd_boolean
5227 bfin_finish_dynamic_symbol (bfd * output_bfd,
5228 struct bfd_link_info *info,
5229 struct elf_link_hash_entry *h,
5230 Elf_Internal_Sym * sym)
5231 {
5232 bfd *dynobj;
5233
5234 dynobj = elf_hash_table (info)->dynobj;
5235
5236 if (h->got.offset != (bfd_vma) - 1)
5237 {
5238 asection *sgot;
5239 asection *srela;
5240 Elf_Internal_Rela rela;
5241 bfd_byte *loc;
5242
5243 /* This symbol has an entry in the global offset table.
5244 Set it up. */
5245
5246 sgot = bfd_get_section_by_name (dynobj, ".got");
5247 srela = bfd_get_section_by_name (dynobj, ".rela.got");
5248 BFD_ASSERT (sgot != NULL && srela != NULL);
5249
5250 rela.r_offset = (sgot->output_section->vma
5251 + sgot->output_offset
5252 + (h->got.offset & ~(bfd_vma) 1));
5253
5254 /* If this is a -Bsymbolic link, and the symbol is defined
5255 locally, we just want to emit a RELATIVE reloc. Likewise if
5256 the symbol was forced to be local because of a version file.
5257 The entry in the global offset table will already have been
5258 initialized in the relocate_section function. */
5259 if (info->shared
5260 && (info->symbolic
5261 || h->dynindx == -1 || h->forced_local) && h->def_regular)
5262 {
5263 fprintf(stderr, "*** check this relocation %s\n", __FUNCTION__);
5264 rela.r_info = ELF32_R_INFO (0, R_BFIN_PCREL24);
5265 rela.r_addend = bfd_get_signed_32 (output_bfd,
5266 (sgot->contents
5267 +
5268 (h->got.
5269 offset & ~(bfd_vma) 1)));
5270 }
5271 else
5272 {
5273 bfd_put_32 (output_bfd, (bfd_vma) 0,
5274 sgot->contents + (h->got.offset & ~(bfd_vma) 1));
5275 rela.r_info = ELF32_R_INFO (h->dynindx, R_BFIN_GOT);
5276 rela.r_addend = 0;
5277 }
5278
5279 loc = srela->contents;
5280 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
5281 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
5282 }
5283
5284 if (h->needs_copy)
5285 {
5286 BFD_ASSERT (0);
5287 }
5288 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
5289 if (strcmp (h->root.root.string, "__DYNAMIC") == 0
5290 || h == elf_hash_table (info)->hgot)
5291 sym->st_shndx = SHN_ABS;
5292
5293 return TRUE;
5294 }
5295
5296 /* Adjust a symbol defined by a dynamic object and referenced by a
5297 regular object. The current definition is in some section of the
5298 dynamic object, but we're not including those sections. We have to
5299 change the definition to something the rest of the link can
5300 understand. */
5301
5302 static bfd_boolean
5303 bfin_adjust_dynamic_symbol (struct bfd_link_info *info,
5304 struct elf_link_hash_entry *h)
5305 {
5306 bfd *dynobj;
5307 asection *s;
5308 unsigned int power_of_two;
5309
5310 dynobj = elf_hash_table (info)->dynobj;
5311
5312 /* Make sure we know what is going on here. */
5313 BFD_ASSERT (dynobj != NULL
5314 && (h->needs_plt
5315 || h->u.weakdef != NULL
5316 || (h->def_dynamic && h->ref_regular && !h->def_regular)));
5317
5318 /* If this is a function, put it in the procedure linkage table. We
5319 will fill in the contents of the procedure linkage table later,
5320 when we know the address of the .got section. */
5321 if (h->type == STT_FUNC || h->needs_plt)
5322 {
5323 BFD_ASSERT(0);
5324 }
5325
5326 /* If this is a weak symbol, and there is a real definition, the
5327 processor independent code will have arranged for us to see the
5328 real definition first, and we can just use the same value. */
5329 if (h->u.weakdef != NULL)
5330 {
5331 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
5332 || h->u.weakdef->root.type == bfd_link_hash_defweak);
5333 h->root.u.def.section = h->u.weakdef->root.u.def.section;
5334 h->root.u.def.value = h->u.weakdef->root.u.def.value;
5335 return TRUE;
5336 }
5337
5338 /* This is a reference to a symbol defined by a dynamic object which
5339 is not a function. */
5340
5341 /* If we are creating a shared library, we must presume that the
5342 only references to the symbol are via the global offset table.
5343 For such cases we need not do anything here; the relocations will
5344 be handled correctly by relocate_section. */
5345 if (info->shared)
5346 return TRUE;
5347
5348 /* We must allocate the symbol in our .dynbss section, which will
5349 become part of the .bss section of the executable. There will be
5350 an entry for this symbol in the .dynsym section. The dynamic
5351 object will contain position independent code, so all references
5352 from the dynamic object to this symbol will go through the global
5353 offset table. The dynamic linker will use the .dynsym entry to
5354 determine the address it must put in the global offset table, so
5355 both the dynamic object and the regular object will refer to the
5356 same memory location for the variable. */
5357
5358 s = bfd_get_section_by_name (dynobj, ".dynbss");
5359 BFD_ASSERT (s != NULL);
5360
5361 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
5362 copy the initial value out of the dynamic object and into the
5363 runtime process image. We need to remember the offset into the
5364 .rela.bss section we are going to use. */
5365 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
5366 {
5367 asection *srel;
5368
5369 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
5370 BFD_ASSERT (srel != NULL);
5371 srel->size += sizeof (Elf32_External_Rela);
5372 h->needs_copy = 1;
5373 }
5374
5375 /* We need to figure out the alignment required for this symbol. I
5376 have no idea how ELF linkers handle this. */
5377 power_of_two = bfd_log2 (h->size);
5378 if (power_of_two > 3)
5379 power_of_two = 3;
5380
5381 /* Apply the required alignment. */
5382 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
5383 if (power_of_two > bfd_get_section_alignment (dynobj, s))
5384 {
5385 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
5386 return FALSE;
5387 }
5388
5389 /* Define the symbol as being at this point in the section. */
5390 h->root.u.def.section = s;
5391 h->root.u.def.value = s->size;
5392
5393 /* Increment the section size to make room for the symbol. */
5394 s->size += h->size;
5395
5396 return TRUE;
5397 }
5398
5399 /* The bfin linker needs to keep track of the number of relocs that it
5400 decides to copy in check_relocs for each symbol. This is so that it
5401 can discard PC relative relocs if it doesn't need them when linking
5402 with -Bsymbolic. We store the information in a field extending the
5403 regular ELF linker hash table. */
5404
5405 /* This structure keeps track of the number of PC relative relocs we have
5406 copied for a given symbol. */
5407
5408 struct bfin_pcrel_relocs_copied
5409 {
5410 /* Next section. */
5411 struct bfin_pcrel_relocs_copied *next;
5412 /* A section in dynobj. */
5413 asection *section;
5414 /* Number of relocs copied in this section. */
5415 bfd_size_type count;
5416 };
5417
5418 /* This function is called via elf_link_hash_traverse if we are
5419 creating a shared object. In the -Bsymbolic case it discards the
5420 space allocated to copy PC relative relocs against symbols which
5421 are defined in regular objects. For the normal shared case, it
5422 discards space for pc-relative relocs that have become local due to
5423 symbol visibility changes. We allocated space for them in the
5424 check_relocs routine, but we won't fill them in in the
5425 relocate_section routine.
5426
5427 We also check whether any of the remaining relocations apply
5428 against a readonly section, and set the DF_TEXTREL flag in this
5429 case. */
5430
5431 static bfd_boolean
5432 bfin_discard_copies (struct elf_link_hash_entry *h, PTR inf)
5433 {
5434 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5435 struct bfin_pcrel_relocs_copied *s;
5436
5437 if (h->root.type == bfd_link_hash_warning)
5438 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5439
5440 if (!h->def_regular || (!info->symbolic && !h->forced_local))
5441 {
5442 if ((info->flags & DF_TEXTREL) == 0)
5443 {
5444 /* Look for relocations against read-only sections. */
5445 for (s = bfin_hash_entry (h)->pcrel_relocs_copied;
5446 s != NULL; s = s->next)
5447 if ((s->section->flags & SEC_READONLY) != 0)
5448 {
5449 info->flags |= DF_TEXTREL;
5450 break;
5451 }
5452 }
5453
5454 return TRUE;
5455 }
5456
5457 for (s = bfin_hash_entry (h)->pcrel_relocs_copied;
5458 s != NULL; s = s->next)
5459 s->section->size -= s->count * sizeof (Elf32_External_Rela);
5460
5461 return TRUE;
5462 }
5463
5464 static bfd_boolean
5465 bfin_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED,
5466 struct bfd_link_info *info)
5467 {
5468 bfd *dynobj;
5469 asection *s;
5470 bfd_boolean relocs;
5471
5472 dynobj = elf_hash_table (info)->dynobj;
5473 BFD_ASSERT (dynobj != NULL);
5474
5475 if (elf_hash_table (info)->dynamic_sections_created)
5476 {
5477 /* Set the contents of the .interp section to the interpreter. */
5478 if (info->executable)
5479 {
5480 s = bfd_get_section_by_name (dynobj, ".interp");
5481 BFD_ASSERT (s != NULL);
5482 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
5483 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
5484 }
5485 }
5486 else
5487 {
5488 /* We may have created entries in the .rela.got section.
5489 However, if we are not creating the dynamic sections, we will
5490 not actually use these entries. Reset the size of .rela.got,
5491 which will cause it to get stripped from the output file
5492 below. */
5493 s = bfd_get_section_by_name (dynobj, ".rela.got");
5494 if (s != NULL)
5495 s->size = 0;
5496 }
5497
5498 /* If this is a -Bsymbolic shared link, then we need to discard all
5499 PC relative relocs against symbols defined in a regular object.
5500 For the normal shared case we discard the PC relative relocs
5501 against symbols that have become local due to visibility changes.
5502 We allocated space for them in the check_relocs routine, but we
5503 will not fill them in in the relocate_section routine. */
5504 if (info->shared)
5505 elf_link_hash_traverse (elf_hash_table (info),
5506 bfin_discard_copies, (PTR) info);
5507
5508 /* The check_relocs and adjust_dynamic_symbol entry points have
5509 determined the sizes of the various dynamic sections. Allocate
5510 memory for them. */
5511 relocs = FALSE;
5512 for (s = dynobj->sections; s != NULL; s = s->next)
5513 {
5514 const char *name;
5515 bfd_boolean strip;
5516
5517 if ((s->flags & SEC_LINKER_CREATED) == 0)
5518 continue;
5519
5520 /* It's OK to base decisions on the section name, because none
5521 of the dynobj section names depend upon the input files. */
5522 name = bfd_get_section_name (dynobj, s);
5523
5524 strip = FALSE;
5525
5526 if (CONST_STRNEQ (name, ".rela"))
5527 {
5528 if (s->size == 0)
5529 {
5530 /* If we don't need this section, strip it from the
5531 output file. This is mostly to handle .rela.bss and
5532 .rela.plt. We must create both sections in
5533 create_dynamic_sections, because they must be created
5534 before the linker maps input sections to output
5535 sections. The linker does that before
5536 adjust_dynamic_symbol is called, and it is that
5537 function which decides whether anything needs to go
5538 into these sections. */
5539 strip = TRUE;
5540 }
5541 else
5542 {
5543 relocs = TRUE;
5544
5545 /* We use the reloc_count field as a counter if we need
5546 to copy relocs into the output file. */
5547 s->reloc_count = 0;
5548 }
5549 }
5550 else if (! CONST_STRNEQ (name, ".got"))
5551 {
5552 /* It's not one of our sections, so don't allocate space. */
5553 continue;
5554 }
5555
5556 if (strip)
5557 {
5558 s->flags |= SEC_EXCLUDE;
5559 continue;
5560 }
5561
5562 /* Allocate memory for the section contents. */
5563 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
5564 Unused entries should be reclaimed before the section's contents
5565 are written out, but at the moment this does not happen. Thus in
5566 order to prevent writing out garbage, we initialise the section's
5567 contents to zero. */
5568 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
5569 if (s->contents == NULL && s->size != 0)
5570 return FALSE;
5571 }
5572
5573 if (elf_hash_table (info)->dynamic_sections_created)
5574 {
5575 /* Add some entries to the .dynamic section. We fill in the
5576 values later, in bfin_finish_dynamic_sections, but we
5577 must add the entries now so that we get the correct size for
5578 the .dynamic section. The DT_DEBUG entry is filled in by the
5579 dynamic linker and used by the debugger. */
5580 #define add_dynamic_entry(TAG, VAL) \
5581 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5582
5583 if (!info->shared)
5584 {
5585 if (!add_dynamic_entry (DT_DEBUG, 0))
5586 return FALSE;
5587 }
5588
5589
5590 if (relocs)
5591 {
5592 if (!add_dynamic_entry (DT_RELA, 0)
5593 || !add_dynamic_entry (DT_RELASZ, 0)
5594 || !add_dynamic_entry (DT_RELAENT,
5595 sizeof (Elf32_External_Rela)))
5596 return FALSE;
5597 }
5598
5599 if ((info->flags & DF_TEXTREL) != 0)
5600 {
5601 if (!add_dynamic_entry (DT_TEXTREL, 0))
5602 return FALSE;
5603 }
5604 }
5605 #undef add_dynamic_entry
5606
5607 return TRUE;
5608 }
5609 \f
5610 /* Given a .data section and a .emreloc in-memory section, store
5611 relocation information into the .emreloc section which can be
5612 used at runtime to relocate the section. This is called by the
5613 linker when the --embedded-relocs switch is used. This is called
5614 after the add_symbols entry point has been called for all the
5615 objects, and before the final_link entry point is called. */
5616
5617 bfd_boolean bfd_bfin_elf32_create_embedded_relocs
5618 PARAMS ((bfd *, struct bfd_link_info *, asection *, asection *, char **));
5619
5620 bfd_boolean
5621 bfd_bfin_elf32_create_embedded_relocs (
5622 bfd *abfd,
5623 struct bfd_link_info *info,
5624 asection *datasec,
5625 asection *relsec,
5626 char **errmsg)
5627 {
5628 Elf_Internal_Shdr *symtab_hdr;
5629 Elf_Internal_Sym *isymbuf = NULL;
5630 Elf_Internal_Rela *internal_relocs = NULL;
5631 Elf_Internal_Rela *irel, *irelend;
5632 bfd_byte *p;
5633 bfd_size_type amt;
5634
5635 BFD_ASSERT (! info->relocatable);
5636
5637 *errmsg = NULL;
5638
5639 if (datasec->reloc_count == 0)
5640 return TRUE;
5641
5642 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
5643
5644 /* Get a copy of the native relocations. */
5645 internal_relocs = (_bfd_elf_link_read_relocs
5646 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
5647 info->keep_memory));
5648 if (internal_relocs == NULL)
5649 goto error_return;
5650
5651 amt = (bfd_size_type) datasec->reloc_count * 12;
5652 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
5653 if (relsec->contents == NULL)
5654 goto error_return;
5655
5656 p = relsec->contents;
5657
5658 irelend = internal_relocs + datasec->reloc_count;
5659 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
5660 {
5661 asection *targetsec;
5662
5663 /* We are going to write a four byte longword into the runtime
5664 reloc section. The longword will be the address in the data
5665 section which must be relocated. It is followed by the name
5666 of the target section NUL-padded or truncated to 8
5667 characters. */
5668
5669 /* We can only relocate absolute longword relocs at run time. */
5670 if (ELF32_R_TYPE (irel->r_info) != (int) R_BFIN_BYTE4_DATA)
5671 {
5672 *errmsg = _("unsupported reloc type");
5673 bfd_set_error (bfd_error_bad_value);
5674 goto error_return;
5675 }
5676
5677 /* Get the target section referred to by the reloc. */
5678 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
5679 {
5680 /* A local symbol. */
5681 Elf_Internal_Sym *isym;
5682
5683 /* Read this BFD's local symbols if we haven't done so already. */
5684 if (isymbuf == NULL)
5685 {
5686 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5687 if (isymbuf == NULL)
5688 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
5689 symtab_hdr->sh_info, 0,
5690 NULL, NULL, NULL);
5691 if (isymbuf == NULL)
5692 goto error_return;
5693 }
5694
5695 isym = isymbuf + ELF32_R_SYM (irel->r_info);
5696 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
5697 }
5698 else
5699 {
5700 unsigned long indx;
5701 struct elf_link_hash_entry *h;
5702
5703 /* An external symbol. */
5704 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
5705 h = elf_sym_hashes (abfd)[indx];
5706 BFD_ASSERT (h != NULL);
5707 if (h->root.type == bfd_link_hash_defined
5708 || h->root.type == bfd_link_hash_defweak)
5709 targetsec = h->root.u.def.section;
5710 else
5711 targetsec = NULL;
5712 }
5713
5714 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
5715 memset (p + 4, 0, 8);
5716 if (targetsec != NULL)
5717 strncpy ((char *) p + 4, targetsec->output_section->name, 8);
5718 }
5719
5720 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
5721 free (isymbuf);
5722 if (internal_relocs != NULL
5723 && elf_section_data (datasec)->relocs != internal_relocs)
5724 free (internal_relocs);
5725 return TRUE;
5726
5727 error_return:
5728 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
5729 free (isymbuf);
5730 if (internal_relocs != NULL
5731 && elf_section_data (datasec)->relocs != internal_relocs)
5732 free (internal_relocs);
5733 return FALSE;
5734 }
5735
5736 struct bfd_elf_special_section const elf32_bfin_special_sections[] =
5737 {
5738 { ".l1.text", 8, -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
5739 { ".l1.data", 8, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
5740 { NULL, 0, 0, 0, 0 }
5741 };
5742
5743 \f
5744 #define TARGET_LITTLE_SYM bfd_elf32_bfin_vec
5745 #define TARGET_LITTLE_NAME "elf32-bfin"
5746 #define ELF_ARCH bfd_arch_bfin
5747 #define ELF_TARGET_ID BFIN_ELF_DATA
5748 #define ELF_MACHINE_CODE EM_BLACKFIN
5749 #define ELF_MAXPAGESIZE 0x1000
5750 #define elf_symbol_leading_char '_'
5751
5752 #define bfd_elf32_bfd_reloc_type_lookup bfin_bfd_reloc_type_lookup
5753 #define bfd_elf32_bfd_reloc_name_lookup \
5754 bfin_bfd_reloc_name_lookup
5755 #define elf_info_to_howto bfin_info_to_howto
5756 #define elf_info_to_howto_rel 0
5757 #define elf_backend_object_p elf32_bfin_object_p
5758
5759 #define bfd_elf32_bfd_is_local_label_name \
5760 bfin_is_local_label_name
5761 #define bfin_hash_table(p) \
5762 ((struct bfin_link_hash_table *) (p)->hash)
5763
5764
5765
5766 #define elf_backend_create_dynamic_sections \
5767 _bfd_elf_create_dynamic_sections
5768 #define bfd_elf32_bfd_link_hash_table_create \
5769 bfin_link_hash_table_create
5770 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
5771
5772 #define elf_backend_check_relocs bfin_check_relocs
5773 #define elf_backend_adjust_dynamic_symbol \
5774 bfin_adjust_dynamic_symbol
5775 #define elf_backend_size_dynamic_sections \
5776 bfin_size_dynamic_sections
5777 #define elf_backend_relocate_section bfin_relocate_section
5778 #define elf_backend_finish_dynamic_symbol \
5779 bfin_finish_dynamic_symbol
5780 #define elf_backend_finish_dynamic_sections \
5781 bfin_finish_dynamic_sections
5782 #define elf_backend_gc_mark_hook bfin_gc_mark_hook
5783 #define elf_backend_gc_sweep_hook bfin_gc_sweep_hook
5784 #define bfd_elf32_bfd_merge_private_bfd_data \
5785 elf32_bfin_merge_private_bfd_data
5786 #define bfd_elf32_bfd_set_private_flags \
5787 elf32_bfin_set_private_flags
5788 #define bfd_elf32_bfd_print_private_bfd_data \
5789 elf32_bfin_print_private_bfd_data
5790 #define elf_backend_reloc_type_class elf32_bfin_reloc_type_class
5791 #define elf_backend_can_gc_sections 1
5792 #define elf_backend_special_sections elf32_bfin_special_sections
5793 #define elf_backend_can_refcount 1
5794 #define elf_backend_want_got_plt 0
5795 #define elf_backend_plt_readonly 1
5796 #define elf_backend_want_plt_sym 0
5797 #define elf_backend_got_header_size 12
5798 #define elf_backend_rela_normal 1
5799
5800 #include "elf32-target.h"
5801
5802 #undef TARGET_LITTLE_SYM
5803 #define TARGET_LITTLE_SYM bfd_elf32_bfinfdpic_vec
5804 #undef TARGET_LITTLE_NAME
5805 #define TARGET_LITTLE_NAME "elf32-bfinfdpic"
5806 #undef elf32_bed
5807 #define elf32_bed elf32_bfinfdpic_bed
5808
5809 #undef elf_backend_gc_sweep_hook
5810 #define elf_backend_gc_sweep_hook bfinfdpic_gc_sweep_hook
5811
5812 #undef elf_backend_got_header_size
5813 #define elf_backend_got_header_size 0
5814
5815 #undef elf_backend_relocate_section
5816 #define elf_backend_relocate_section bfinfdpic_relocate_section
5817 #undef elf_backend_check_relocs
5818 #define elf_backend_check_relocs bfinfdpic_check_relocs
5819
5820 #undef bfd_elf32_bfd_link_hash_table_create
5821 #define bfd_elf32_bfd_link_hash_table_create \
5822 bfinfdpic_elf_link_hash_table_create
5823 #undef elf_backend_always_size_sections
5824 #define elf_backend_always_size_sections \
5825 elf32_bfinfdpic_always_size_sections
5826 #undef elf_backend_modify_program_headers
5827 #define elf_backend_modify_program_headers \
5828 elf32_bfinfdpic_modify_program_headers
5829 #undef bfd_elf32_bfd_copy_private_bfd_data
5830 #define bfd_elf32_bfd_copy_private_bfd_data \
5831 elf32_bfinfdpic_copy_private_bfd_data
5832
5833 #undef elf_backend_create_dynamic_sections
5834 #define elf_backend_create_dynamic_sections \
5835 elf32_bfinfdpic_create_dynamic_sections
5836 #undef elf_backend_adjust_dynamic_symbol
5837 #define elf_backend_adjust_dynamic_symbol \
5838 elf32_bfinfdpic_adjust_dynamic_symbol
5839 #undef elf_backend_size_dynamic_sections
5840 #define elf_backend_size_dynamic_sections \
5841 elf32_bfinfdpic_size_dynamic_sections
5842 #undef elf_backend_finish_dynamic_symbol
5843 #define elf_backend_finish_dynamic_symbol \
5844 elf32_bfinfdpic_finish_dynamic_symbol
5845 #undef elf_backend_finish_dynamic_sections
5846 #define elf_backend_finish_dynamic_sections \
5847 elf32_bfinfdpic_finish_dynamic_sections
5848
5849 #undef elf_backend_discard_info
5850 #define elf_backend_discard_info \
5851 bfinfdpic_elf_discard_info
5852 #undef elf_backend_can_make_relative_eh_frame
5853 #define elf_backend_can_make_relative_eh_frame \
5854 bfinfdpic_elf_use_relative_eh_frame
5855 #undef elf_backend_can_make_lsda_relative_eh_frame
5856 #define elf_backend_can_make_lsda_relative_eh_frame \
5857 bfinfdpic_elf_use_relative_eh_frame
5858 #undef elf_backend_encode_eh_address
5859 #define elf_backend_encode_eh_address \
5860 bfinfdpic_elf_encode_eh_address
5861
5862 #undef elf_backend_may_use_rel_p
5863 #define elf_backend_may_use_rel_p 1
5864 #undef elf_backend_may_use_rela_p
5865 #define elf_backend_may_use_rela_p 1
5866 /* We use REL for dynamic relocations only. */
5867 #undef elf_backend_default_use_rela_p
5868 #define elf_backend_default_use_rela_p 1
5869
5870 #undef elf_backend_omit_section_dynsym
5871 #define elf_backend_omit_section_dynsym _bfinfdpic_link_omit_section_dynsym
5872
5873 #include "elf32-target.h"
GDB Binutils - Deliverables
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