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* dwarf2.c (read_attribute_value): Add DW_FORM_ref_sig8.
[binutils-gdb.git] / bfd / elf32-bfin.c
1 /* ADI Blackfin BFD support for 32-bit ELF.
2 Copyright 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "libbfd.h"
24 #include "elf-bfd.h"
25 #include "elf/bfin.h"
26 #include "dwarf2.h"
27 #include "hashtab.h"
28
29 /* FUNCTION : bfin_pltpc_reloc
30 ABSTRACT : TODO : figure out how to handle pltpc relocs. */
31 static bfd_reloc_status_type
32 bfin_pltpc_reloc (
33 bfd *abfd ATTRIBUTE_UNUSED,
34 arelent *reloc_entry ATTRIBUTE_UNUSED,
35 asymbol *symbol ATTRIBUTE_UNUSED,
36 PTR data ATTRIBUTE_UNUSED,
37 asection *input_section ATTRIBUTE_UNUSED,
38 bfd *output_bfd ATTRIBUTE_UNUSED,
39 char **error_message ATTRIBUTE_UNUSED)
40 {
41 bfd_reloc_status_type flag = bfd_reloc_ok;
42 return flag;
43 }
44 \f
45
46 static bfd_reloc_status_type
47 bfin_pcrel24_reloc (bfd *abfd,
48 arelent *reloc_entry,
49 asymbol *symbol,
50 PTR data,
51 asection *input_section,
52 bfd *output_bfd,
53 char **error_message ATTRIBUTE_UNUSED)
54 {
55 bfd_vma relocation;
56 bfd_size_type addr = reloc_entry->address;
57 bfd_vma output_base = 0;
58 reloc_howto_type *howto = reloc_entry->howto;
59 asection *output_section;
60 bfd_boolean relocatable = (output_bfd != NULL);
61
62 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
63 return bfd_reloc_outofrange;
64
65 if (bfd_is_und_section (symbol->section)
66 && (symbol->flags & BSF_WEAK) == 0
67 && !relocatable)
68 return bfd_reloc_undefined;
69
70 if (bfd_is_com_section (symbol->section))
71 relocation = 0;
72 else
73 relocation = symbol->value;
74
75 output_section = symbol->section->output_section;
76
77 if (relocatable)
78 output_base = 0;
79 else
80 output_base = output_section->vma;
81
82 if (!relocatable || !strcmp (symbol->name, symbol->section->name))
83 relocation += output_base + symbol->section->output_offset;
84
85 if (!relocatable && !strcmp (symbol->name, symbol->section->name))
86 relocation += reloc_entry->addend;
87
88 relocation -= input_section->output_section->vma + input_section->output_offset;
89 relocation -= reloc_entry->address;
90
91 if (howto->complain_on_overflow != complain_overflow_dont)
92 {
93 bfd_reloc_status_type status;
94 status = bfd_check_overflow (howto->complain_on_overflow,
95 howto->bitsize,
96 howto->rightshift,
97 bfd_arch_bits_per_address(abfd),
98 relocation);
99 if (status != bfd_reloc_ok)
100 return status;
101 }
102
103 /* if rightshift is 1 and the number odd, return error. */
104 if (howto->rightshift && (relocation & 0x01))
105 {
106 fprintf(stderr, "relocation should be even number\n");
107 return bfd_reloc_overflow;
108 }
109
110 relocation >>= (bfd_vma) howto->rightshift;
111 /* Shift everything up to where it's going to be used. */
112
113 relocation <<= (bfd_vma) howto->bitpos;
114
115 if (relocatable)
116 {
117 reloc_entry->address += input_section->output_offset;
118 reloc_entry->addend += symbol->section->output_offset;
119 }
120
121 {
122 short x;
123
124 /* We are getting reloc_entry->address 2 byte off from
125 the start of instruction. Assuming absolute postion
126 of the reloc data. But, following code had been written assuming
127 reloc address is starting at begining of instruction.
128 To compensate that I have increased the value of
129 relocation by 1 (effectively 2) and used the addr -2 instead of addr. */
130
131 relocation += 1;
132 x = bfd_get_16 (abfd, (bfd_byte *) data + addr - 2);
133 x = (x & 0xff00) | ((relocation >> 16) & 0xff);
134 bfd_put_16 (abfd, x, (unsigned char *) data + addr - 2);
135
136 x = bfd_get_16 (abfd, (bfd_byte *) data + addr);
137 x = relocation & 0xFFFF;
138 bfd_put_16 (abfd, x, (unsigned char *) data + addr );
139 }
140 return bfd_reloc_ok;
141 }
142
143 static bfd_reloc_status_type
144 bfin_imm16_reloc (bfd *abfd,
145 arelent *reloc_entry,
146 asymbol *symbol,
147 PTR data,
148 asection *input_section,
149 bfd *output_bfd,
150 char **error_message ATTRIBUTE_UNUSED)
151 {
152 bfd_vma relocation, x;
153 bfd_size_type reloc_addr = reloc_entry->address;
154 bfd_vma output_base = 0;
155 reloc_howto_type *howto = reloc_entry->howto;
156 asection *output_section;
157 bfd_boolean relocatable = (output_bfd != NULL);
158
159 /* Is the address of the relocation really within the section? */
160 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
161 return bfd_reloc_outofrange;
162
163 if (bfd_is_und_section (symbol->section)
164 && (symbol->flags & BSF_WEAK) == 0
165 && !relocatable)
166 return bfd_reloc_undefined;
167
168 output_section = symbol->section->output_section;
169 relocation = symbol->value;
170
171 /* Convert input-section-relative symbol value to absolute. */
172 if (relocatable)
173 output_base = 0;
174 else
175 output_base = output_section->vma;
176
177 if (!relocatable || !strcmp (symbol->name, symbol->section->name))
178 relocation += output_base + symbol->section->output_offset;
179
180 /* Add in supplied addend. */
181 relocation += reloc_entry->addend;
182
183 if (relocatable)
184 {
185 reloc_entry->address += input_section->output_offset;
186 reloc_entry->addend += symbol->section->output_offset;
187 }
188 else
189 {
190 reloc_entry->addend = 0;
191 }
192
193 if (howto->complain_on_overflow != complain_overflow_dont)
194 {
195 bfd_reloc_status_type flag;
196 flag = bfd_check_overflow (howto->complain_on_overflow,
197 howto->bitsize,
198 howto->rightshift,
199 bfd_arch_bits_per_address(abfd),
200 relocation);
201 if (flag != bfd_reloc_ok)
202 return flag;
203 }
204
205 /* Here the variable relocation holds the final address of the
206 symbol we are relocating against, plus any addend. */
207
208 relocation >>= (bfd_vma) howto->rightshift;
209 x = relocation;
210 bfd_put_16 (abfd, x, (unsigned char *) data + reloc_addr);
211 return bfd_reloc_ok;
212 }
213
214
215 static bfd_reloc_status_type
216 bfin_byte4_reloc (bfd *abfd,
217 arelent *reloc_entry,
218 asymbol *symbol,
219 PTR data,
220 asection *input_section,
221 bfd *output_bfd,
222 char **error_message ATTRIBUTE_UNUSED)
223 {
224 bfd_vma relocation, x;
225 bfd_size_type addr = reloc_entry->address;
226 bfd_vma output_base = 0;
227 asection *output_section;
228 bfd_boolean relocatable = (output_bfd != NULL);
229
230 /* Is the address of the relocation really within the section? */
231 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
232 return bfd_reloc_outofrange;
233
234 if (bfd_is_und_section (symbol->section)
235 && (symbol->flags & BSF_WEAK) == 0
236 && !relocatable)
237 return bfd_reloc_undefined;
238
239 output_section = symbol->section->output_section;
240 relocation = symbol->value;
241 /* Convert input-section-relative symbol value to absolute. */
242 if (relocatable)
243 output_base = 0;
244 else
245 output_base = output_section->vma;
246
247 if ((symbol->name
248 && symbol->section->name
249 && !strcmp (symbol->name, symbol->section->name))
250 || !relocatable)
251 {
252 relocation += output_base + symbol->section->output_offset;
253 }
254
255 relocation += reloc_entry->addend;
256
257 if (relocatable)
258 {
259 /* This output will be relocatable ... like ld -r. */
260 reloc_entry->address += input_section->output_offset;
261 reloc_entry->addend += symbol->section->output_offset;
262 }
263 else
264 {
265 reloc_entry->addend = 0;
266 }
267
268 /* Here the variable relocation holds the final address of the
269 symbol we are relocating against, plus any addend. */
270 x = relocation & 0xFFFF0000;
271 x >>=16;
272 bfd_put_16 (abfd, x, (unsigned char *) data + addr + 2);
273
274 x = relocation & 0x0000FFFF;
275 bfd_put_16 (abfd, x, (unsigned char *) data + addr);
276 return bfd_reloc_ok;
277 }
278
279 /* bfin_bfd_reloc handles the blackfin arithmetic relocations.
280 Use this instead of bfd_perform_relocation. */
281 static bfd_reloc_status_type
282 bfin_bfd_reloc (bfd *abfd,
283 arelent *reloc_entry,
284 asymbol *symbol,
285 PTR data,
286 asection *input_section,
287 bfd *output_bfd,
288 char **error_message ATTRIBUTE_UNUSED)
289 {
290 bfd_vma relocation;
291 bfd_size_type addr = reloc_entry->address;
292 bfd_vma output_base = 0;
293 reloc_howto_type *howto = reloc_entry->howto;
294 asection *output_section;
295 bfd_boolean relocatable = (output_bfd != NULL);
296
297 /* Is the address of the relocation really within the section? */
298 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
299 return bfd_reloc_outofrange;
300
301 if (bfd_is_und_section (symbol->section)
302 && (symbol->flags & BSF_WEAK) == 0
303 && !relocatable)
304 return bfd_reloc_undefined;
305
306 /* Get symbol value. (Common symbols are special.) */
307 if (bfd_is_com_section (symbol->section))
308 relocation = 0;
309 else
310 relocation = symbol->value;
311
312 output_section = symbol->section->output_section;
313
314 /* Convert input-section-relative symbol value to absolute. */
315 if (relocatable)
316 output_base = 0;
317 else
318 output_base = output_section->vma;
319
320 if (!relocatable || !strcmp (symbol->name, symbol->section->name))
321 relocation += output_base + symbol->section->output_offset;
322
323 if (!relocatable && !strcmp (symbol->name, symbol->section->name))
324 {
325 /* Add in supplied addend. */
326 relocation += reloc_entry->addend;
327 }
328
329 /* Here the variable relocation holds the final address of the
330 symbol we are relocating against, plus any addend. */
331
332 if (howto->pc_relative == TRUE)
333 {
334 relocation -= input_section->output_section->vma + input_section->output_offset;
335
336 if (howto->pcrel_offset == TRUE)
337 relocation -= reloc_entry->address;
338 }
339
340 if (relocatable)
341 {
342 reloc_entry->address += input_section->output_offset;
343 reloc_entry->addend += symbol->section->output_offset;
344 }
345
346 if (howto->complain_on_overflow != complain_overflow_dont)
347 {
348 bfd_reloc_status_type status;
349
350 status = bfd_check_overflow (howto->complain_on_overflow,
351 howto->bitsize,
352 howto->rightshift,
353 bfd_arch_bits_per_address(abfd),
354 relocation);
355 if (status != bfd_reloc_ok)
356 return status;
357 }
358
359 /* If rightshift is 1 and the number odd, return error. */
360 if (howto->rightshift && (relocation & 0x01))
361 {
362 fprintf(stderr, "relocation should be even number\n");
363 return bfd_reloc_overflow;
364 }
365
366 relocation >>= (bfd_vma) howto->rightshift;
367
368 /* Shift everything up to where it's going to be used. */
369
370 relocation <<= (bfd_vma) howto->bitpos;
371
372 #define DOIT(x) \
373 x = ( (x & ~howto->dst_mask) | (relocation & howto->dst_mask))
374
375 /* handle 8 and 16 bit relocations here. */
376 switch (howto->size)
377 {
378 case 0:
379 {
380 char x = bfd_get_8 (abfd, (char *) data + addr);
381 DOIT (x);
382 bfd_put_8 (abfd, x, (unsigned char *) data + addr);
383 }
384 break;
385
386 case 1:
387 {
388 unsigned short x = bfd_get_16 (abfd, (bfd_byte *) data + addr);
389 DOIT (x);
390 bfd_put_16 (abfd, (bfd_vma) x, (unsigned char *) data + addr);
391 }
392 break;
393
394 default:
395 return bfd_reloc_other;
396 }
397
398 return bfd_reloc_ok;
399 }
400
401 /* HOWTO Table for blackfin.
402 Blackfin relocations are fairly complicated.
403 Some of the salient features are
404 a. Even numbered offsets. A number of (not all) relocations are
405 even numbered. This means that the rightmost bit is not stored.
406 Needs to right shift by 1 and check to see if value is not odd
407 b. A relocation can be an expression. An expression takes on
408 a variety of relocations arranged in a stack.
409 As a result, we cannot use the standard generic function as special
410 function. We will have our own, which is very similar to the standard
411 generic function except that it understands how to get the value from
412 the relocation stack. . */
413
414 #define BFIN_RELOC_MIN 0
415 #define BFIN_RELOC_MAX 0x21
416 #define BFIN_GNUEXT_RELOC_MIN 0x40
417 #define BFIN_GNUEXT_RELOC_MAX 0x43
418 #define BFIN_ARELOC_MIN 0xE0
419 #define BFIN_ARELOC_MAX 0xF3
420
421 static reloc_howto_type bfin_howto_table [] =
422 {
423 /* This reloc does nothing. . */
424 HOWTO (R_BFIN_UNUSED0, /* type. */
425 0, /* rightshift. */
426 2, /* size (0 = byte, 1 = short, 2 = long). */
427 32, /* bitsize. */
428 FALSE, /* pc_relative. */
429 0, /* bitpos. */
430 complain_overflow_bitfield, /* complain_on_overflow. */
431 bfd_elf_generic_reloc, /* special_function. */
432 "R_BFIN_UNUSED0", /* name. */
433 FALSE, /* partial_inplace. */
434 0, /* src_mask. */
435 0, /* dst_mask. */
436 FALSE), /* pcrel_offset. */
437
438 HOWTO (R_BFIN_PCREL5M2, /* type. */
439 1, /* rightshift. */
440 1, /* size (0 = byte, 1 = short, 2 = long).. */
441 4, /* bitsize. */
442 TRUE, /* pc_relative. */
443 0, /* bitpos. */
444 complain_overflow_unsigned, /* complain_on_overflow. */
445 bfin_bfd_reloc, /* special_function. */
446 "R_BFIN_PCREL5M2", /* name. */
447 FALSE, /* partial_inplace. */
448 0, /* src_mask. */
449 0x0000000F, /* dst_mask. */
450 FALSE), /* pcrel_offset. */
451
452 HOWTO (R_BFIN_UNUSED1, /* type. */
453 0, /* rightshift. */
454 2, /* size (0 = byte, 1 = short, 2 = long). */
455 32, /* bitsize. */
456 FALSE, /* pc_relative. */
457 0, /* bitpos. */
458 complain_overflow_bitfield, /* complain_on_overflow. */
459 bfd_elf_generic_reloc, /* special_function. */
460 "R_BFIN_UNUSED1", /* name. */
461 FALSE, /* partial_inplace. */
462 0, /* src_mask. */
463 0, /* dst_mask. */
464 FALSE), /* pcrel_offset. */
465
466 HOWTO (R_BFIN_PCREL10, /* type. */
467 1, /* rightshift. */
468 1, /* size (0 = byte, 1 = short, 2 = long). */
469 10, /* bitsize. */
470 TRUE, /* pc_relative. */
471 0, /* bitpos. */
472 complain_overflow_signed, /* complain_on_overflow. */
473 bfin_bfd_reloc, /* special_function. */
474 "R_BFIN_PCREL10", /* name. */
475 FALSE, /* partial_inplace. */
476 0, /* src_mask. */
477 0x000003FF, /* dst_mask. */
478 TRUE), /* pcrel_offset. */
479
480 HOWTO (R_BFIN_PCREL12_JUMP, /* type. */
481 1, /* rightshift. */
482 /* the offset is actually 13 bit
483 aligned on a word boundary so
484 only 12 bits have to be used.
485 Right shift the rightmost bit.. */
486 1, /* size (0 = byte, 1 = short, 2 = long). */
487 12, /* bitsize. */
488 TRUE, /* pc_relative. */
489 0, /* bitpos. */
490 complain_overflow_signed, /* complain_on_overflow. */
491 bfin_bfd_reloc, /* special_function. */
492 "R_BFIN_PCREL12_JUMP", /* name. */
493 FALSE, /* partial_inplace. */
494 0, /* src_mask. */
495 0x0FFF, /* dst_mask. */
496 TRUE), /* pcrel_offset. */
497
498 HOWTO (R_BFIN_RIMM16, /* type. */
499 0, /* rightshift. */
500 1, /* size (0 = byte, 1 = short, 2 = long). */
501 16, /* bitsize. */
502 FALSE, /* pc_relative. */
503 0, /* bitpos. */
504 complain_overflow_signed, /* complain_on_overflow. */
505 bfin_imm16_reloc, /* special_function. */
506 "R_BFIN_RIMM16", /* name. */
507 FALSE, /* partial_inplace. */
508 0, /* src_mask. */
509 0x0000FFFF, /* dst_mask. */
510 TRUE), /* pcrel_offset. */
511
512 HOWTO (R_BFIN_LUIMM16, /* type. */
513 0, /* rightshift. */
514 1, /* size (0 = byte, 1 = short, 2 = long). */
515 16, /* bitsize. */
516 FALSE, /* pc_relative. */
517 0, /* bitpos. */
518 complain_overflow_dont, /* complain_on_overflow. */
519 bfin_imm16_reloc, /* special_function. */
520 "R_BFIN_LUIMM16", /* name. */
521 FALSE, /* partial_inplace. */
522 0, /* src_mask. */
523 0x0000FFFF, /* dst_mask. */
524 TRUE), /* pcrel_offset. */
525
526 HOWTO (R_BFIN_HUIMM16, /* type. */
527 16, /* rightshift. */
528 1, /* size (0 = byte, 1 = short, 2 = long). */
529 16, /* bitsize. */
530 FALSE, /* pc_relative. */
531 0, /* bitpos. */
532 complain_overflow_unsigned, /* complain_on_overflow. */
533 bfin_imm16_reloc, /* special_function. */
534 "R_BFIN_HUIMM16", /* name. */
535 FALSE, /* partial_inplace. */
536 0, /* src_mask. */
537 0x0000FFFF, /* dst_mask. */
538 TRUE), /* pcrel_offset. */
539
540 HOWTO (R_BFIN_PCREL12_JUMP_S, /* type. */
541 1, /* rightshift. */
542 1, /* size (0 = byte, 1 = short, 2 = long). */
543 12, /* bitsize. */
544 TRUE, /* pc_relative. */
545 0, /* bitpos. */
546 complain_overflow_signed, /* complain_on_overflow. */
547 bfin_bfd_reloc, /* special_function. */
548 "R_BFIN_PCREL12_JUMP_S", /* name. */
549 FALSE, /* partial_inplace. */
550 0, /* src_mask. */
551 0x00000FFF, /* dst_mask. */
552 TRUE), /* pcrel_offset. */
553
554 HOWTO (R_BFIN_PCREL24_JUMP_X, /* type. */
555 1, /* rightshift. */
556 2, /* size (0 = byte, 1 = short, 2 = long). */
557 24, /* bitsize. */
558 TRUE, /* pc_relative. */
559 0, /* bitpos. */
560 complain_overflow_signed, /* complain_on_overflow. */
561 bfin_pcrel24_reloc, /* special_function. */
562 "R_BFIN_PCREL24_JUMP_X", /* name. */
563 FALSE, /* partial_inplace. */
564 0, /* src_mask. */
565 0x00FFFFFF, /* dst_mask. */
566 TRUE), /* pcrel_offset. */
567
568 HOWTO (R_BFIN_PCREL24, /* type. */
569 1, /* rightshift. */
570 2, /* size (0 = byte, 1 = short, 2 = long). */
571 24, /* bitsize. */
572 TRUE, /* pc_relative. */
573 0, /* bitpos. */
574 complain_overflow_signed, /* complain_on_overflow. */
575 bfin_pcrel24_reloc, /* special_function. */
576 "R_BFIN_PCREL24", /* name. */
577 FALSE, /* partial_inplace. */
578 0, /* src_mask. */
579 0x00FFFFFF, /* dst_mask. */
580 TRUE), /* pcrel_offset. */
581
582 HOWTO (R_BFIN_UNUSEDB, /* type. */
583 0, /* rightshift. */
584 2, /* size (0 = byte, 1 = short, 2 = long). */
585 32, /* bitsize. */
586 FALSE, /* pc_relative. */
587 0, /* bitpos. */
588 complain_overflow_dont, /* complain_on_overflow. */
589 bfd_elf_generic_reloc, /* special_function. */
590 "R_BFIN_UNUSEDB", /* name. */
591 FALSE, /* partial_inplace. */
592 0, /* src_mask. */
593 0, /* dst_mask. */
594 FALSE), /* pcrel_offset. */
595
596 HOWTO (R_BFIN_UNUSEDC, /* type. */
597 0, /* rightshift. */
598 2, /* size (0 = byte, 1 = short, 2 = long). */
599 32, /* bitsize. */
600 FALSE, /* pc_relative. */
601 0, /* bitpos. */
602 complain_overflow_dont, /* complain_on_overflow. */
603 bfd_elf_generic_reloc, /* special_function. */
604 "R_BFIN_UNUSEDC", /* name. */
605 FALSE, /* partial_inplace. */
606 0, /* src_mask. */
607 0, /* dst_mask. */
608 FALSE), /* pcrel_offset. */
609
610 HOWTO (R_BFIN_PCREL24_JUMP_L, /* type. */
611 1, /* rightshift. */
612 2, /* size (0 = byte, 1 = short, 2 = long). */
613 24, /* bitsize. */
614 TRUE, /* pc_relative. */
615 0, /* bitpos. */
616 complain_overflow_signed, /* complain_on_overflow. */
617 bfin_pcrel24_reloc, /* special_function. */
618 "R_BFIN_PCREL24_JUMP_L", /* name. */
619 FALSE, /* partial_inplace. */
620 0, /* src_mask. */
621 0x00FFFFFF, /* dst_mask. */
622 TRUE), /* pcrel_offset. */
623
624 HOWTO (R_BFIN_PCREL24_CALL_X, /* type. */
625 1, /* rightshift. */
626 2, /* size (0 = byte, 1 = short, 2 = long). */
627 24, /* bitsize. */
628 TRUE, /* pc_relative. */
629 0, /* bitpos. */
630 complain_overflow_signed, /* complain_on_overflow. */
631 bfin_pcrel24_reloc, /* special_function. */
632 "R_BFIN_PCREL24_CALL_X", /* name. */
633 FALSE, /* partial_inplace. */
634 0, /* src_mask. */
635 0x00FFFFFF, /* dst_mask. */
636 TRUE), /* pcrel_offset. */
637
638 HOWTO (R_BFIN_VAR_EQ_SYMB, /* type. */
639 0, /* rightshift. */
640 2, /* size (0 = byte, 1 = short, 2 = long). */
641 32, /* bitsize. */
642 FALSE, /* pc_relative. */
643 0, /* bitpos. */
644 complain_overflow_bitfield, /* complain_on_overflow. */
645 bfin_bfd_reloc, /* special_function. */
646 "R_BFIN_VAR_EQ_SYMB", /* name. */
647 FALSE, /* partial_inplace. */
648 0, /* src_mask. */
649 0, /* dst_mask. */
650 FALSE), /* pcrel_offset. */
651
652 HOWTO (R_BFIN_BYTE_DATA, /* type. */
653 0, /* rightshift. */
654 0, /* size (0 = byte, 1 = short, 2 = long). */
655 8, /* bitsize. */
656 FALSE, /* pc_relative. */
657 0, /* bitpos. */
658 complain_overflow_unsigned, /* complain_on_overflow. */
659 bfin_bfd_reloc, /* special_function. */
660 "R_BFIN_BYTE_DATA", /* name. */
661 FALSE, /* partial_inplace. */
662 0, /* src_mask. */
663 0xFF, /* dst_mask. */
664 TRUE), /* pcrel_offset. */
665
666 HOWTO (R_BFIN_BYTE2_DATA, /* type. */
667 0, /* rightshift. */
668 1, /* size (0 = byte, 1 = short, 2 = long). */
669 16, /* bitsize. */
670 FALSE, /* pc_relative. */
671 0, /* bitpos. */
672 complain_overflow_signed, /* complain_on_overflow. */
673 bfin_bfd_reloc, /* special_function. */
674 "R_BFIN_BYTE2_DATA", /* name. */
675 FALSE, /* partial_inplace. */
676 0, /* src_mask. */
677 0xFFFF, /* dst_mask. */
678 TRUE), /* pcrel_offset. */
679
680 HOWTO (R_BFIN_BYTE4_DATA, /* type. */
681 0, /* rightshift. */
682 2, /* size (0 = byte, 1 = short, 2 = long). */
683 32, /* bitsize. */
684 FALSE, /* pc_relative. */
685 0, /* bitpos. */
686 complain_overflow_unsigned, /* complain_on_overflow. */
687 bfin_byte4_reloc, /* special_function. */
688 "R_BFIN_BYTE4_DATA", /* name. */
689 FALSE, /* partial_inplace. */
690 0, /* src_mask. */
691 0xFFFFFFFF, /* dst_mask. */
692 TRUE), /* pcrel_offset. */
693
694 HOWTO (R_BFIN_PCREL11, /* type. */
695 1, /* rightshift. */
696 1, /* size (0 = byte, 1 = short, 2 = long). */
697 10, /* bitsize. */
698 TRUE, /* pc_relative. */
699 0, /* bitpos. */
700 complain_overflow_unsigned, /* complain_on_overflow. */
701 bfin_bfd_reloc, /* special_function. */
702 "R_BFIN_PCREL11", /* name. */
703 FALSE, /* partial_inplace. */
704 0, /* src_mask. */
705 0x000003FF, /* dst_mask. */
706 FALSE), /* pcrel_offset. */
707
708
709 /* A 18-bit signed operand with the GOT offset for the address of
710 the symbol. */
711 HOWTO (R_BFIN_GOT17M4, /* type */
712 2, /* rightshift */
713 1, /* size (0 = byte, 1 = short, 2 = long) */
714 16, /* bitsize */
715 FALSE, /* pc_relative */
716 0, /* bitpos */
717 complain_overflow_signed, /* complain_on_overflow */
718 bfd_elf_generic_reloc, /* special_function */
719 "R_BFIN_GOT17M4", /* name */
720 FALSE, /* partial_inplace */
721 0xffff, /* src_mask */
722 0xffff, /* dst_mask */
723 FALSE), /* pcrel_offset */
724
725 /* The upper 16 bits of the GOT offset for the address of the
726 symbol. */
727 HOWTO (R_BFIN_GOTHI, /* type */
728 0, /* rightshift */
729 1, /* size (0 = byte, 1 = short, 2 = long) */
730 16, /* bitsize */
731 FALSE, /* pc_relative */
732 0, /* bitpos */
733 complain_overflow_dont, /* complain_on_overflow */
734 bfd_elf_generic_reloc, /* special_function */
735 "R_BFIN_GOTHI", /* name */
736 FALSE, /* partial_inplace */
737 0xffff, /* src_mask */
738 0xffff, /* dst_mask */
739 FALSE), /* pcrel_offset */
740
741 /* The lower 16 bits of the GOT offset for the address of the
742 symbol. */
743 HOWTO (R_BFIN_GOTLO, /* type */
744 0, /* rightshift */
745 1, /* size (0 = byte, 1 = short, 2 = long) */
746 16, /* bitsize */
747 FALSE, /* pc_relative */
748 0, /* bitpos */
749 complain_overflow_dont, /* complain_on_overflow */
750 bfd_elf_generic_reloc, /* special_function */
751 "R_BFIN_GOTLO", /* name */
752 FALSE, /* partial_inplace */
753 0xffff, /* src_mask */
754 0xffff, /* dst_mask */
755 FALSE), /* pcrel_offset */
756
757 /* The 32-bit address of the canonical descriptor of a function. */
758 HOWTO (R_BFIN_FUNCDESC, /* type */
759 0, /* rightshift */
760 2, /* size (0 = byte, 1 = short, 2 = long) */
761 32, /* bitsize */
762 FALSE, /* pc_relative */
763 0, /* bitpos */
764 complain_overflow_bitfield, /* complain_on_overflow */
765 bfd_elf_generic_reloc, /* special_function */
766 "R_BFIN_FUNCDESC", /* name */
767 FALSE, /* partial_inplace */
768 0xffffffff, /* src_mask */
769 0xffffffff, /* dst_mask */
770 FALSE), /* pcrel_offset */
771
772 /* A 12-bit signed operand with the GOT offset for the address of
773 canonical descriptor of a function. */
774 HOWTO (R_BFIN_FUNCDESC_GOT17M4, /* type */
775 2, /* rightshift */
776 1, /* size (0 = byte, 1 = short, 2 = long) */
777 16, /* bitsize */
778 FALSE, /* pc_relative */
779 0, /* bitpos */
780 complain_overflow_signed, /* complain_on_overflow */
781 bfd_elf_generic_reloc, /* special_function */
782 "R_BFIN_FUNCDESC_GOT17M4", /* name */
783 FALSE, /* partial_inplace */
784 0xffff, /* src_mask */
785 0xffff, /* dst_mask */
786 FALSE), /* pcrel_offset */
787
788 /* The upper 16 bits of the GOT offset for the address of the
789 canonical descriptor of a function. */
790 HOWTO (R_BFIN_FUNCDESC_GOTHI, /* type */
791 0, /* rightshift */
792 1, /* size (0 = byte, 1 = short, 2 = long) */
793 16, /* bitsize */
794 FALSE, /* pc_relative */
795 0, /* bitpos */
796 complain_overflow_dont, /* complain_on_overflow */
797 bfd_elf_generic_reloc, /* special_function */
798 "R_BFIN_FUNCDESC_GOTHI", /* name */
799 FALSE, /* partial_inplace */
800 0xffff, /* src_mask */
801 0xffff, /* dst_mask */
802 FALSE), /* pcrel_offset */
803
804 /* The lower 16 bits of the GOT offset for the address of the
805 canonical descriptor of a function. */
806 HOWTO (R_BFIN_FUNCDESC_GOTLO, /* type */
807 0, /* rightshift */
808 1, /* size (0 = byte, 1 = short, 2 = long) */
809 16, /* bitsize */
810 FALSE, /* pc_relative */
811 0, /* bitpos */
812 complain_overflow_dont, /* complain_on_overflow */
813 bfd_elf_generic_reloc, /* special_function */
814 "R_BFIN_FUNCDESC_GOTLO", /* name */
815 FALSE, /* partial_inplace */
816 0xffff, /* src_mask */
817 0xffff, /* dst_mask */
818 FALSE), /* pcrel_offset */
819
820 /* The 32-bit address of the canonical descriptor of a function. */
821 HOWTO (R_BFIN_FUNCDESC_VALUE, /* type */
822 0, /* rightshift */
823 2, /* size (0 = byte, 1 = short, 2 = long) */
824 64, /* bitsize */
825 FALSE, /* pc_relative */
826 0, /* bitpos */
827 complain_overflow_bitfield, /* complain_on_overflow */
828 bfd_elf_generic_reloc, /* special_function */
829 "R_BFIN_FUNCDESC_VALUE", /* name */
830 FALSE, /* partial_inplace */
831 0xffffffff, /* src_mask */
832 0xffffffff, /* dst_mask */
833 FALSE), /* pcrel_offset */
834
835 /* A 12-bit signed operand with the GOT offset for the address of
836 canonical descriptor of a function. */
837 HOWTO (R_BFIN_FUNCDESC_GOTOFF17M4, /* type */
838 2, /* rightshift */
839 1, /* size (0 = byte, 1 = short, 2 = long) */
840 16, /* bitsize */
841 FALSE, /* pc_relative */
842 0, /* bitpos */
843 complain_overflow_signed, /* complain_on_overflow */
844 bfd_elf_generic_reloc, /* special_function */
845 "R_BFIN_FUNCDESC_GOTOFF17M4", /* name */
846 FALSE, /* partial_inplace */
847 0xffff, /* src_mask */
848 0xffff, /* dst_mask */
849 FALSE), /* pcrel_offset */
850
851 /* The upper 16 bits of the GOT offset for the address of the
852 canonical descriptor of a function. */
853 HOWTO (R_BFIN_FUNCDESC_GOTOFFHI, /* type */
854 0, /* rightshift */
855 1, /* size (0 = byte, 1 = short, 2 = long) */
856 16, /* bitsize */
857 FALSE, /* pc_relative */
858 0, /* bitpos */
859 complain_overflow_dont, /* complain_on_overflow */
860 bfd_elf_generic_reloc, /* special_function */
861 "R_BFIN_FUNCDESC_GOTOFFHI", /* name */
862 FALSE, /* partial_inplace */
863 0xffff, /* src_mask */
864 0xffff, /* dst_mask */
865 FALSE), /* pcrel_offset */
866
867 /* The lower 16 bits of the GOT offset for the address of the
868 canonical descriptor of a function. */
869 HOWTO (R_BFIN_FUNCDESC_GOTOFFLO, /* type */
870 0, /* rightshift */
871 1, /* size (0 = byte, 1 = short, 2 = long) */
872 16, /* bitsize */
873 FALSE, /* pc_relative */
874 0, /* bitpos */
875 complain_overflow_dont, /* complain_on_overflow */
876 bfd_elf_generic_reloc, /* special_function */
877 "R_BFIN_FUNCDESC_GOTOFFLO", /* name */
878 FALSE, /* partial_inplace */
879 0xffff, /* src_mask */
880 0xffff, /* dst_mask */
881 FALSE), /* pcrel_offset */
882
883 /* A 12-bit signed operand with the GOT offset for the address of
884 the symbol. */
885 HOWTO (R_BFIN_GOTOFF17M4, /* type */
886 2, /* rightshift */
887 1, /* size (0 = byte, 1 = short, 2 = long) */
888 16, /* bitsize */
889 FALSE, /* pc_relative */
890 0, /* bitpos */
891 complain_overflow_signed, /* complain_on_overflow */
892 bfd_elf_generic_reloc, /* special_function */
893 "R_BFIN_GOTOFF17M4", /* name */
894 FALSE, /* partial_inplace */
895 0xffff, /* src_mask */
896 0xffff, /* dst_mask */
897 FALSE), /* pcrel_offset */
898
899 /* The upper 16 bits of the GOT offset for the address of the
900 symbol. */
901 HOWTO (R_BFIN_GOTOFFHI, /* type */
902 0, /* rightshift */
903 1, /* size (0 = byte, 1 = short, 2 = long) */
904 16, /* bitsize */
905 FALSE, /* pc_relative */
906 0, /* bitpos */
907 complain_overflow_dont, /* complain_on_overflow */
908 bfd_elf_generic_reloc, /* special_function */
909 "R_BFIN_GOTOFFHI", /* name */
910 FALSE, /* partial_inplace */
911 0xffff, /* src_mask */
912 0xffff, /* dst_mask */
913 FALSE), /* pcrel_offset */
914
915 /* The lower 16 bits of the GOT offset for the address of the
916 symbol. */
917 HOWTO (R_BFIN_GOTOFFLO, /* type */
918 0, /* rightshift */
919 1, /* size (0 = byte, 1 = short, 2 = long) */
920 16, /* bitsize */
921 FALSE, /* pc_relative */
922 0, /* bitpos */
923 complain_overflow_dont, /* complain_on_overflow */
924 bfd_elf_generic_reloc, /* special_function */
925 "R_BFIN_GOTOFFLO", /* name */
926 FALSE, /* partial_inplace */
927 0xffff, /* src_mask */
928 0xffff, /* dst_mask */
929 FALSE), /* pcrel_offset */
930 };
931
932 static reloc_howto_type bfin_gnuext_howto_table [] =
933 {
934 HOWTO (R_BFIN_PLTPC, /* type. */
935 0, /* rightshift. */
936 1, /* size (0 = byte, 1 = short, 2 = long). */
937 16, /* bitsize. */
938 FALSE, /* pc_relative. */
939 0, /* bitpos. */
940 complain_overflow_bitfield, /* complain_on_overflow. */
941 bfin_pltpc_reloc, /* special_function. */
942 "R_BFIN_PLTPC", /* name. */
943 FALSE, /* partial_inplace. */
944 0xffff, /* src_mask. */
945 0xffff, /* dst_mask. */
946 FALSE), /* pcrel_offset. */
947
948 HOWTO (R_BFIN_GOT, /* type. */
949 0, /* rightshift. */
950 1, /* size (0 = byte, 1 = short, 2 = long). */
951 16, /* bitsize. */
952 FALSE, /* pc_relative. */
953 0, /* bitpos. */
954 complain_overflow_bitfield, /* complain_on_overflow. */
955 bfd_elf_generic_reloc, /* special_function. */
956 "R_BFIN_GOT", /* name. */
957 FALSE, /* partial_inplace. */
958 0x7fff, /* src_mask. */
959 0x7fff, /* dst_mask. */
960 FALSE), /* pcrel_offset. */
961
962 /* GNU extension to record C++ vtable hierarchy. */
963 HOWTO (R_BFIN_GNU_VTINHERIT, /* type. */
964 0, /* rightshift. */
965 2, /* size (0 = byte, 1 = short, 2 = long). */
966 0, /* bitsize. */
967 FALSE, /* pc_relative. */
968 0, /* bitpos. */
969 complain_overflow_dont, /* complain_on_overflow. */
970 NULL, /* special_function. */
971 "R_BFIN_GNU_VTINHERIT", /* name. */
972 FALSE, /* partial_inplace. */
973 0, /* src_mask. */
974 0, /* dst_mask. */
975 FALSE), /* pcrel_offset. */
976
977 /* GNU extension to record C++ vtable member usage. */
978 HOWTO (R_BFIN_GNU_VTENTRY, /* type. */
979 0, /* rightshift. */
980 2, /* size (0 = byte, 1 = short, 2 = long). */
981 0, /* bitsize. */
982 FALSE, /* pc_relative. */
983 0, /* bitpos. */
984 complain_overflow_dont, /* complain_on_overflow. */
985 _bfd_elf_rel_vtable_reloc_fn, /* special_function. */
986 "R_BFIN_GNU_VTENTRY", /* name. */
987 FALSE, /* partial_inplace. */
988 0, /* src_mask. */
989 0, /* dst_mask. */
990 FALSE) /* pcrel_offset. */
991 };
992
993 struct bfin_reloc_map
994 {
995 bfd_reloc_code_real_type bfd_reloc_val;
996 unsigned int bfin_reloc_val;
997 };
998
999 static const struct bfin_reloc_map bfin_reloc_map [] =
1000 {
1001 { BFD_RELOC_NONE, R_BFIN_UNUSED0 },
1002 { BFD_RELOC_BFIN_5_PCREL, R_BFIN_PCREL5M2 },
1003 { BFD_RELOC_NONE, R_BFIN_UNUSED1 },
1004 { BFD_RELOC_BFIN_10_PCREL, R_BFIN_PCREL10 },
1005 { BFD_RELOC_BFIN_12_PCREL_JUMP, R_BFIN_PCREL12_JUMP },
1006 { BFD_RELOC_BFIN_16_IMM, R_BFIN_RIMM16 },
1007 { BFD_RELOC_BFIN_16_LOW, R_BFIN_LUIMM16 },
1008 { BFD_RELOC_BFIN_16_HIGH, R_BFIN_HUIMM16 },
1009 { BFD_RELOC_BFIN_12_PCREL_JUMP_S, R_BFIN_PCREL12_JUMP_S },
1010 { BFD_RELOC_24_PCREL, R_BFIN_PCREL24 },
1011 { BFD_RELOC_24_PCREL, R_BFIN_PCREL24 },
1012 { BFD_RELOC_BFIN_24_PCREL_JUMP_L, R_BFIN_PCREL24_JUMP_L },
1013 { BFD_RELOC_NONE, R_BFIN_UNUSEDB },
1014 { BFD_RELOC_NONE, R_BFIN_UNUSEDC },
1015 { BFD_RELOC_BFIN_24_PCREL_CALL_X, R_BFIN_PCREL24_CALL_X },
1016 { BFD_RELOC_8, R_BFIN_BYTE_DATA },
1017 { BFD_RELOC_16, R_BFIN_BYTE2_DATA },
1018 { BFD_RELOC_32, R_BFIN_BYTE4_DATA },
1019 { BFD_RELOC_BFIN_11_PCREL, R_BFIN_PCREL11 },
1020 { BFD_RELOC_BFIN_GOT, R_BFIN_GOT },
1021 { BFD_RELOC_BFIN_PLTPC, R_BFIN_PLTPC },
1022
1023 { BFD_RELOC_BFIN_GOT17M4, R_BFIN_GOT17M4 },
1024 { BFD_RELOC_BFIN_GOTHI, R_BFIN_GOTHI },
1025 { BFD_RELOC_BFIN_GOTLO, R_BFIN_GOTLO },
1026 { BFD_RELOC_BFIN_FUNCDESC, R_BFIN_FUNCDESC },
1027 { BFD_RELOC_BFIN_FUNCDESC_GOT17M4, R_BFIN_FUNCDESC_GOT17M4 },
1028 { BFD_RELOC_BFIN_FUNCDESC_GOTHI, R_BFIN_FUNCDESC_GOTHI },
1029 { BFD_RELOC_BFIN_FUNCDESC_GOTLO, R_BFIN_FUNCDESC_GOTLO },
1030 { BFD_RELOC_BFIN_FUNCDESC_VALUE, R_BFIN_FUNCDESC_VALUE },
1031 { BFD_RELOC_BFIN_FUNCDESC_GOTOFF17M4, R_BFIN_FUNCDESC_GOTOFF17M4 },
1032 { BFD_RELOC_BFIN_FUNCDESC_GOTOFFHI, R_BFIN_FUNCDESC_GOTOFFHI },
1033 { BFD_RELOC_BFIN_FUNCDESC_GOTOFFLO, R_BFIN_FUNCDESC_GOTOFFLO },
1034 { BFD_RELOC_BFIN_GOTOFF17M4, R_BFIN_GOTOFF17M4 },
1035 { BFD_RELOC_BFIN_GOTOFFHI, R_BFIN_GOTOFFHI },
1036 { BFD_RELOC_BFIN_GOTOFFLO, R_BFIN_GOTOFFLO },
1037
1038 { BFD_RELOC_VTABLE_INHERIT, R_BFIN_GNU_VTINHERIT },
1039 { BFD_RELOC_VTABLE_ENTRY, R_BFIN_GNU_VTENTRY },
1040 };
1041
1042
1043 static void
1044 bfin_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
1045 arelent *cache_ptr,
1046 Elf_Internal_Rela *dst)
1047 {
1048 unsigned int r_type;
1049
1050 r_type = ELF32_R_TYPE (dst->r_info);
1051
1052 if (r_type <= BFIN_RELOC_MAX)
1053 cache_ptr->howto = &bfin_howto_table [r_type];
1054
1055 else if (r_type >= BFIN_GNUEXT_RELOC_MIN && r_type <= BFIN_GNUEXT_RELOC_MAX)
1056 cache_ptr->howto = &bfin_gnuext_howto_table [r_type - BFIN_GNUEXT_RELOC_MIN];
1057
1058 else
1059 cache_ptr->howto = (reloc_howto_type *) NULL;
1060 }
1061
1062 /* Given a BFD reloc type, return the howto. */
1063 static reloc_howto_type *
1064 bfin_bfd_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
1065 bfd_reloc_code_real_type code)
1066 {
1067 unsigned int i;
1068 unsigned int r_type = BFIN_RELOC_MIN;
1069
1070 for (i = sizeof (bfin_reloc_map) / sizeof (bfin_reloc_map[0]); --i;)
1071 if (bfin_reloc_map[i].bfd_reloc_val == code)
1072 r_type = bfin_reloc_map[i].bfin_reloc_val;
1073
1074 if (r_type <= BFIN_RELOC_MAX && r_type > BFIN_RELOC_MIN)
1075 return &bfin_howto_table [r_type];
1076
1077 else if (r_type >= BFIN_GNUEXT_RELOC_MIN && r_type <= BFIN_GNUEXT_RELOC_MAX)
1078 return &bfin_gnuext_howto_table [r_type - BFIN_GNUEXT_RELOC_MIN];
1079
1080 return (reloc_howto_type *) NULL;
1081 }
1082
1083 static reloc_howto_type *
1084 bfin_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
1085 const char *r_name)
1086 {
1087 unsigned int i;
1088
1089 for (i = 0;
1090 i < (sizeof (bfin_howto_table)
1091 / sizeof (bfin_howto_table[0]));
1092 i++)
1093 if (bfin_howto_table[i].name != NULL
1094 && strcasecmp (bfin_howto_table[i].name, r_name) == 0)
1095 return &bfin_howto_table[i];
1096
1097 for (i = 0;
1098 i < (sizeof (bfin_gnuext_howto_table)
1099 / sizeof (bfin_gnuext_howto_table[0]));
1100 i++)
1101 if (bfin_gnuext_howto_table[i].name != NULL
1102 && strcasecmp (bfin_gnuext_howto_table[i].name, r_name) == 0)
1103 return &bfin_gnuext_howto_table[i];
1104
1105 return NULL;
1106 }
1107
1108 /* Given a bfin relocation type, return the howto. */
1109 static reloc_howto_type *
1110 bfin_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
1111 unsigned int r_type)
1112 {
1113 if (r_type <= BFIN_RELOC_MAX)
1114 return &bfin_howto_table [r_type];
1115
1116 else if (r_type >= BFIN_GNUEXT_RELOC_MIN && r_type <= BFIN_GNUEXT_RELOC_MAX)
1117 return &bfin_gnuext_howto_table [r_type - BFIN_GNUEXT_RELOC_MIN];
1118
1119 return (reloc_howto_type *) NULL;
1120 }
1121
1122 /* Return TRUE if the name is a local label.
1123 bfin local labels begin with L$. */
1124 static bfd_boolean
1125 bfin_is_local_label_name (
1126 bfd *abfd,
1127 const char *label)
1128 {
1129 if (label[0] == 'L' && label[1] == '$' )
1130 return TRUE;
1131
1132 return _bfd_elf_is_local_label_name (abfd, label);
1133 }
1134 \f
1135 /* Look through the relocs for a section during the first phase, and
1136 allocate space in the global offset table or procedure linkage
1137 table. */
1138
1139 static bfd_boolean
1140 bfin_check_relocs (bfd * abfd,
1141 struct bfd_link_info *info,
1142 asection *sec,
1143 const Elf_Internal_Rela *relocs)
1144 {
1145 bfd *dynobj;
1146 Elf_Internal_Shdr *symtab_hdr;
1147 struct elf_link_hash_entry **sym_hashes;
1148 bfd_signed_vma *local_got_refcounts;
1149 const Elf_Internal_Rela *rel;
1150 const Elf_Internal_Rela *rel_end;
1151 asection *sgot;
1152 asection *srelgot;
1153 if (info->relocatable)
1154 return TRUE;
1155
1156 dynobj = elf_hash_table (info)->dynobj;
1157 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1158 sym_hashes = elf_sym_hashes (abfd);
1159 local_got_refcounts = elf_local_got_refcounts (abfd);
1160
1161 sgot = NULL;
1162 srelgot = NULL;
1163
1164 rel_end = relocs + sec->reloc_count;
1165 for (rel = relocs; rel < rel_end; rel++)
1166 {
1167 unsigned long r_symndx;
1168 struct elf_link_hash_entry *h;
1169
1170 r_symndx = ELF32_R_SYM (rel->r_info);
1171 if (r_symndx < symtab_hdr->sh_info)
1172 h = NULL;
1173 else
1174 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1175
1176 switch (ELF32_R_TYPE (rel->r_info))
1177 {
1178 /* This relocation describes the C++ object vtable hierarchy.
1179 Reconstruct it for later use during GC. */
1180 case R_BFIN_GNU_VTINHERIT:
1181 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1182 return FALSE;
1183 break;
1184
1185 /* This relocation describes which C++ vtable entries
1186 are actually used. Record for later use during GC. */
1187 case R_BFIN_GNU_VTENTRY:
1188 BFD_ASSERT (h != NULL);
1189 if (h != NULL
1190 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1191 return FALSE;
1192 break;
1193
1194 case R_BFIN_GOT:
1195 if (h != NULL
1196 && strcmp (h->root.root.string, "__GLOBAL_OFFSET_TABLE_") == 0)
1197 break;
1198 /* Fall through. */
1199
1200 if (dynobj == NULL)
1201 {
1202 /* Create the .got section. */
1203 elf_hash_table (info)->dynobj = dynobj = abfd;
1204 if (!_bfd_elf_create_got_section (dynobj, info))
1205 return FALSE;
1206 }
1207
1208 if (sgot == NULL)
1209 {
1210 sgot = bfd_get_section_by_name (dynobj, ".got");
1211 BFD_ASSERT (sgot != NULL);
1212 }
1213
1214 if (srelgot == NULL && (h != NULL || info->shared))
1215 {
1216 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1217 if (srelgot == NULL)
1218 {
1219 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
1220 | SEC_IN_MEMORY | SEC_LINKER_CREATED
1221 | SEC_READONLY);
1222 srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
1223 flags);
1224 if (srelgot == NULL
1225 || !bfd_set_section_alignment (dynobj, srelgot, 2))
1226 return FALSE;
1227 }
1228 }
1229
1230 if (h != NULL)
1231 {
1232 if (h->got.refcount == 0)
1233 {
1234 /* Make sure this symbol is output as a dynamic symbol. */
1235 if (h->dynindx == -1 && !h->forced_local)
1236 {
1237 if (!bfd_elf_link_record_dynamic_symbol (info, h))
1238 return FALSE;
1239 }
1240
1241 /* Allocate space in the .got section. */
1242 sgot->size += 4;
1243 /* Allocate relocation space. */
1244 srelgot->size += sizeof (Elf32_External_Rela);
1245 }
1246 h->got.refcount++;
1247 }
1248 else
1249 {
1250 /* This is a global offset table entry for a local symbol. */
1251 if (local_got_refcounts == NULL)
1252 {
1253 bfd_size_type size;
1254
1255 size = symtab_hdr->sh_info;
1256 size *= sizeof (bfd_signed_vma);
1257 local_got_refcounts = ((bfd_signed_vma *)
1258 bfd_zalloc (abfd, size));
1259 if (local_got_refcounts == NULL)
1260 return FALSE;
1261 elf_local_got_refcounts (abfd) = local_got_refcounts;
1262 }
1263 if (local_got_refcounts[r_symndx] == 0)
1264 {
1265 sgot->size += 4;
1266 if (info->shared)
1267 {
1268 /* If we are generating a shared object, we need to
1269 output a R_68K_RELATIVE reloc so that the dynamic
1270 linker can adjust this GOT entry. */
1271 srelgot->size += sizeof (Elf32_External_Rela);
1272 }
1273 }
1274 local_got_refcounts[r_symndx]++;
1275 }
1276 break;
1277
1278 default:
1279 break;
1280 }
1281 }
1282
1283 return TRUE;
1284 }
1285
1286 static enum elf_reloc_type_class
1287 elf32_bfin_reloc_type_class (const Elf_Internal_Rela * rela)
1288 {
1289 switch ((int) ELF32_R_TYPE (rela->r_info))
1290 {
1291 default:
1292 return reloc_class_normal;
1293 }
1294 }
1295 \f
1296 static bfd_reloc_status_type
1297 bfin_final_link_relocate (Elf_Internal_Rela *rel, reloc_howto_type *howto,
1298 bfd *input_bfd, asection *input_section,
1299 bfd_byte *contents, bfd_vma address,
1300 bfd_vma value, bfd_vma addend)
1301 {
1302 int r_type = ELF32_R_TYPE (rel->r_info);
1303
1304 if (r_type == R_BFIN_PCREL24 || r_type == R_BFIN_PCREL24_JUMP_L)
1305 {
1306 bfd_reloc_status_type r = bfd_reloc_ok;
1307 bfd_vma x;
1308
1309 if (address > bfd_get_section_limit (input_bfd, input_section))
1310 return bfd_reloc_outofrange;
1311
1312 value += addend;
1313
1314 /* Perform usual pc-relative correction. */
1315 value -= input_section->output_section->vma + input_section->output_offset;
1316 value -= address;
1317
1318 /* We are getting reloc_entry->address 2 byte off from
1319 the start of instruction. Assuming absolute postion
1320 of the reloc data. But, following code had been written assuming
1321 reloc address is starting at begining of instruction.
1322 To compensate that I have increased the value of
1323 relocation by 1 (effectively 2) and used the addr -2 instead of addr. */
1324
1325 value += 2;
1326 address -= 2;
1327
1328 if ((value & 0xFF000000) != 0
1329 && (value & 0xFF000000) != 0xFF000000)
1330 r = bfd_reloc_overflow;
1331
1332 value >>= 1;
1333
1334 x = bfd_get_16 (input_bfd, contents + address);
1335 x = (x & 0xff00) | ((value >> 16) & 0xff);
1336 bfd_put_16 (input_bfd, x, contents + address);
1337
1338 x = bfd_get_16 (input_bfd, contents + address + 2);
1339 x = value & 0xFFFF;
1340 bfd_put_16 (input_bfd, x, contents + address + 2);
1341 return r;
1342 }
1343
1344 return _bfd_final_link_relocate (howto, input_bfd, input_section, contents,
1345 rel->r_offset, value, addend);
1346
1347 }
1348
1349 static bfd_boolean
1350 bfin_relocate_section (bfd * output_bfd,
1351 struct bfd_link_info *info,
1352 bfd * input_bfd,
1353 asection * input_section,
1354 bfd_byte * contents,
1355 Elf_Internal_Rela * relocs,
1356 Elf_Internal_Sym * local_syms,
1357 asection ** local_sections)
1358 {
1359 bfd *dynobj;
1360 Elf_Internal_Shdr *symtab_hdr;
1361 struct elf_link_hash_entry **sym_hashes;
1362 bfd_vma *local_got_offsets;
1363 asection *sgot;
1364 Elf_Internal_Rela *rel;
1365 Elf_Internal_Rela *relend;
1366 int i = 0;
1367
1368 dynobj = elf_hash_table (info)->dynobj;
1369 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1370 sym_hashes = elf_sym_hashes (input_bfd);
1371 local_got_offsets = elf_local_got_offsets (input_bfd);
1372
1373 sgot = NULL;
1374
1375 rel = relocs;
1376 relend = relocs + input_section->reloc_count;
1377 for (; rel < relend; rel++, i++)
1378 {
1379 int r_type;
1380 reloc_howto_type *howto;
1381 unsigned long r_symndx;
1382 struct elf_link_hash_entry *h;
1383 Elf_Internal_Sym *sym;
1384 asection *sec;
1385 bfd_vma relocation = 0;
1386 bfd_boolean unresolved_reloc;
1387 bfd_reloc_status_type r;
1388 bfd_vma address;
1389
1390 r_type = ELF32_R_TYPE (rel->r_info);
1391 if (r_type < 0 || r_type >= 243)
1392 {
1393 bfd_set_error (bfd_error_bad_value);
1394 return FALSE;
1395 }
1396
1397 if (r_type == R_BFIN_GNU_VTENTRY
1398 || r_type == R_BFIN_GNU_VTINHERIT)
1399 continue;
1400
1401 howto = bfin_reloc_type_lookup (input_bfd, r_type);
1402 if (howto == NULL)
1403 {
1404 bfd_set_error (bfd_error_bad_value);
1405 return FALSE;
1406 }
1407 r_symndx = ELF32_R_SYM (rel->r_info);
1408
1409 h = NULL;
1410 sym = NULL;
1411 sec = NULL;
1412 unresolved_reloc = FALSE;
1413
1414 if (r_symndx < symtab_hdr->sh_info)
1415 {
1416 sym = local_syms + r_symndx;
1417 sec = local_sections[r_symndx];
1418 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1419 }
1420 else
1421 {
1422 bfd_boolean warned;
1423
1424 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1425 r_symndx, symtab_hdr, sym_hashes,
1426 h, sec, relocation,
1427 unresolved_reloc, warned);
1428 }
1429
1430 if (sec != NULL && elf_discarded_section (sec))
1431 {
1432 /* For relocs against symbols from removed linkonce sections,
1433 or sections discarded by a linker script, we just want the
1434 section contents zeroed. Avoid any special processing. */
1435 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
1436 rel->r_info = 0;
1437 rel->r_addend = 0;
1438 continue;
1439 }
1440
1441 if (info->relocatable)
1442 continue;
1443
1444 address = rel->r_offset;
1445
1446 /* Then, process normally. */
1447 switch (r_type)
1448 {
1449 case R_BFIN_GNU_VTINHERIT:
1450 case R_BFIN_GNU_VTENTRY:
1451 return bfd_reloc_ok;
1452
1453 case R_BFIN_GOT:
1454 /* Relocation is to the address of the entry for this symbol
1455 in the global offset table. */
1456 if (h != NULL
1457 && strcmp (h->root.root.string, "__GLOBAL_OFFSET_TABLE_") == 0)
1458 goto do_default;
1459 /* Fall through. */
1460 /* Relocation is the offset of the entry for this symbol in
1461 the global offset table. */
1462
1463 {
1464 bfd_vma off;
1465
1466 if (dynobj == NULL)
1467 {
1468 /* Create the .got section. */
1469 elf_hash_table (info)->dynobj = dynobj = output_bfd;
1470 if (!_bfd_elf_create_got_section (dynobj, info))
1471 return FALSE;
1472 }
1473
1474 if (sgot == NULL)
1475 {
1476 sgot = bfd_get_section_by_name (dynobj, ".got");
1477 BFD_ASSERT (sgot != NULL);
1478 }
1479
1480 if (h != NULL)
1481 {
1482 bfd_boolean dyn;
1483
1484 off = h->got.offset;
1485 BFD_ASSERT (off != (bfd_vma) - 1);
1486 dyn = elf_hash_table (info)->dynamic_sections_created;
1487
1488 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
1489 || (info->shared
1490 && (info->symbolic
1491 || h->dynindx == -1
1492 || h->forced_local)
1493 && h->def_regular))
1494 {
1495 /* This is actually a static link, or it is a
1496 -Bsymbolic link and the symbol is defined
1497 locally, or the symbol was forced to be local
1498 because of a version file.. We must initialize
1499 this entry in the global offset table. Since
1500 the offset must always be a multiple of 4, we
1501 use the least significant bit to record whether
1502 we have initialized it already.
1503
1504 When doing a dynamic link, we create a .rela.got
1505 relocation entry to initialize the value. This
1506 is done in the finish_dynamic_symbol routine. */
1507 if ((off & 1) != 0)
1508 off &= ~1;
1509 else
1510 {
1511 bfd_put_32 (output_bfd, relocation,
1512 sgot->contents + off);
1513 h->got.offset |= 1;
1514 }
1515 }
1516 else
1517 unresolved_reloc = FALSE;
1518 }
1519 else
1520 {
1521 BFD_ASSERT (local_got_offsets != NULL);
1522 off = local_got_offsets[r_symndx];
1523 BFD_ASSERT (off != (bfd_vma) - 1);
1524
1525 /* The offset must always be a multiple of 4. We use
1526 the least significant bit to record whether we have
1527 already generated the necessary reloc. */
1528 if ((off & 1) != 0)
1529 off &= ~1;
1530 else
1531 {
1532 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1533
1534 if (info->shared)
1535 {
1536 asection *s;
1537 Elf_Internal_Rela outrel;
1538 bfd_byte *loc;
1539
1540 s = bfd_get_section_by_name (dynobj, ".rela.got");
1541 BFD_ASSERT (s != NULL);
1542
1543 outrel.r_offset = (sgot->output_section->vma
1544 + sgot->output_offset + off);
1545 outrel.r_info =
1546 ELF32_R_INFO (0, R_BFIN_PCREL24);
1547 outrel.r_addend = relocation;
1548 loc = s->contents;
1549 loc +=
1550 s->reloc_count++ * sizeof (Elf32_External_Rela);
1551 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1552 }
1553
1554 local_got_offsets[r_symndx] |= 1;
1555 }
1556 }
1557
1558 relocation = sgot->output_offset + off;
1559 rel->r_addend = 0;
1560 /* bfin : preg = [preg + 17bitdiv4offset] relocation is div by 4. */
1561 relocation /= 4;
1562 }
1563 goto do_default;
1564
1565 default:
1566 do_default:
1567 r = bfin_final_link_relocate (rel, howto, input_bfd, input_section,
1568 contents, address,
1569 relocation, rel->r_addend);
1570
1571 break;
1572 }
1573
1574 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1575 because such sections are not SEC_ALLOC and thus ld.so will
1576 not process them. */
1577 if (unresolved_reloc
1578 && !((input_section->flags & SEC_DEBUGGING) != 0 && h->def_dynamic))
1579 {
1580 (*_bfd_error_handler)
1581 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
1582 input_bfd,
1583 input_section, (long) rel->r_offset, h->root.root.string);
1584 return FALSE;
1585 }
1586
1587 if (r != bfd_reloc_ok)
1588 {
1589 const char *name;
1590
1591 if (h != NULL)
1592 name = h->root.root.string;
1593 else
1594 {
1595 name = bfd_elf_string_from_elf_section (input_bfd,
1596 symtab_hdr->sh_link,
1597 sym->st_name);
1598 if (name == NULL)
1599 return FALSE;
1600 if (*name == '\0')
1601 name = bfd_section_name (input_bfd, sec);
1602 }
1603
1604 if (r == bfd_reloc_overflow)
1605 {
1606 if (!(info->callbacks->reloc_overflow
1607 (info, (h ? &h->root : NULL), name, howto->name,
1608 (bfd_vma) 0, input_bfd, input_section, rel->r_offset)))
1609 return FALSE;
1610 }
1611 else
1612 {
1613 (*_bfd_error_handler)
1614 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
1615 input_bfd, input_section,
1616 (long) rel->r_offset, name, (int) r);
1617 return FALSE;
1618 }
1619 }
1620 }
1621
1622 return TRUE;
1623 }
1624
1625 static asection *
1626 bfin_gc_mark_hook (asection * sec,
1627 struct bfd_link_info *info,
1628 Elf_Internal_Rela * rel,
1629 struct elf_link_hash_entry *h,
1630 Elf_Internal_Sym * sym)
1631 {
1632 if (h != NULL)
1633 switch (ELF32_R_TYPE (rel->r_info))
1634 {
1635 case R_BFIN_GNU_VTINHERIT:
1636 case R_BFIN_GNU_VTENTRY:
1637 return NULL;
1638 }
1639
1640 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1641 }
1642
1643 /* Update the got entry reference counts for the section being removed. */
1644
1645 static bfd_boolean
1646 bfin_gc_sweep_hook (bfd * abfd,
1647 struct bfd_link_info *info,
1648 asection * sec,
1649 const Elf_Internal_Rela * relocs)
1650 {
1651 Elf_Internal_Shdr *symtab_hdr;
1652 struct elf_link_hash_entry **sym_hashes;
1653 bfd_signed_vma *local_got_refcounts;
1654 const Elf_Internal_Rela *rel, *relend;
1655 bfd *dynobj;
1656 asection *sgot;
1657 asection *srelgot;
1658
1659 dynobj = elf_hash_table (info)->dynobj;
1660 if (dynobj == NULL)
1661 return TRUE;
1662
1663 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1664 sym_hashes = elf_sym_hashes (abfd);
1665 local_got_refcounts = elf_local_got_refcounts (abfd);
1666
1667 sgot = bfd_get_section_by_name (dynobj, ".got");
1668 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1669
1670 relend = relocs + sec->reloc_count;
1671 for (rel = relocs; rel < relend; rel++)
1672 {
1673 unsigned long r_symndx;
1674 struct elf_link_hash_entry *h;
1675
1676 switch (ELF32_R_TYPE (rel->r_info))
1677 {
1678 case R_BFIN_GOT:
1679 r_symndx = ELF32_R_SYM (rel->r_info);
1680 if (r_symndx >= symtab_hdr->sh_info)
1681 {
1682 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1683 if (h->got.refcount > 0)
1684 {
1685 --h->got.refcount;
1686 if (h->got.refcount == 0)
1687 {
1688 /* We don't need the .got entry any more. */
1689 sgot->size -= 4;
1690 srelgot->size -= sizeof (Elf32_External_Rela);
1691 }
1692 }
1693 }
1694 else if (local_got_refcounts != NULL)
1695 {
1696 if (local_got_refcounts[r_symndx] > 0)
1697 {
1698 --local_got_refcounts[r_symndx];
1699 if (local_got_refcounts[r_symndx] == 0)
1700 {
1701 /* We don't need the .got entry any more. */
1702 sgot->size -= 4;
1703 if (info->shared)
1704 srelgot->size -= sizeof (Elf32_External_Rela);
1705 }
1706 }
1707 }
1708 break;
1709 default:
1710 break;
1711 }
1712 }
1713 return TRUE;
1714 }
1715 \f
1716 extern const bfd_target bfd_elf32_bfinfdpic_vec;
1717 #define IS_FDPIC(bfd) ((bfd)->xvec == &bfd_elf32_bfinfdpic_vec)
1718
1719 /* An extension of the elf hash table data structure, containing some
1720 additional Blackfin-specific data. */
1721 struct bfinfdpic_elf_link_hash_table
1722 {
1723 struct elf_link_hash_table elf;
1724
1725 /* A pointer to the .got section. */
1726 asection *sgot;
1727 /* A pointer to the .rel.got section. */
1728 asection *sgotrel;
1729 /* A pointer to the .rofixup section. */
1730 asection *sgotfixup;
1731 /* A pointer to the .plt section. */
1732 asection *splt;
1733 /* A pointer to the .rel.plt section. */
1734 asection *spltrel;
1735 /* GOT base offset. */
1736 bfd_vma got0;
1737 /* Location of the first non-lazy PLT entry, i.e., the number of
1738 bytes taken by lazy PLT entries. */
1739 bfd_vma plt0;
1740 /* A hash table holding information about which symbols were
1741 referenced with which PIC-related relocations. */
1742 struct htab *relocs_info;
1743 /* Summary reloc information collected by
1744 _bfinfdpic_count_got_plt_entries. */
1745 struct _bfinfdpic_dynamic_got_info *g;
1746 };
1747
1748 /* Get the Blackfin ELF linker hash table from a link_info structure. */
1749
1750 #define bfinfdpic_hash_table(info) \
1751 ((struct bfinfdpic_elf_link_hash_table *) ((info)->hash))
1752
1753 #define bfinfdpic_got_section(info) \
1754 (bfinfdpic_hash_table (info)->sgot)
1755 #define bfinfdpic_gotrel_section(info) \
1756 (bfinfdpic_hash_table (info)->sgotrel)
1757 #define bfinfdpic_gotfixup_section(info) \
1758 (bfinfdpic_hash_table (info)->sgotfixup)
1759 #define bfinfdpic_plt_section(info) \
1760 (bfinfdpic_hash_table (info)->splt)
1761 #define bfinfdpic_pltrel_section(info) \
1762 (bfinfdpic_hash_table (info)->spltrel)
1763 #define bfinfdpic_relocs_info(info) \
1764 (bfinfdpic_hash_table (info)->relocs_info)
1765 #define bfinfdpic_got_initial_offset(info) \
1766 (bfinfdpic_hash_table (info)->got0)
1767 #define bfinfdpic_plt_initial_offset(info) \
1768 (bfinfdpic_hash_table (info)->plt0)
1769 #define bfinfdpic_dynamic_got_plt_info(info) \
1770 (bfinfdpic_hash_table (info)->g)
1771
1772 /* The name of the dynamic interpreter. This is put in the .interp
1773 section. */
1774
1775 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
1776
1777 #define DEFAULT_STACK_SIZE 0x20000
1778
1779 /* This structure is used to collect the number of entries present in
1780 each addressable range of the got. */
1781 struct _bfinfdpic_dynamic_got_info
1782 {
1783 /* Several bits of information about the current link. */
1784 struct bfd_link_info *info;
1785 /* Total size needed for GOT entries within the 18- or 32-bit
1786 ranges. */
1787 bfd_vma got17m4, gothilo;
1788 /* Total size needed for function descriptor entries within the 18-
1789 or 32-bit ranges. */
1790 bfd_vma fd17m4, fdhilo;
1791 /* Total size needed function descriptor entries referenced in PLT
1792 entries, that would be profitable to place in offsets close to
1793 the PIC register. */
1794 bfd_vma fdplt;
1795 /* Total size needed by lazy PLT entries. */
1796 bfd_vma lzplt;
1797 /* Number of relocations carried over from input object files. */
1798 unsigned long relocs;
1799 /* Number of fixups introduced by relocations in input object files. */
1800 unsigned long fixups;
1801 };
1802
1803 /* Create a Blackfin ELF linker hash table. */
1804
1805 static struct bfd_link_hash_table *
1806 bfinfdpic_elf_link_hash_table_create (bfd *abfd)
1807 {
1808 struct bfinfdpic_elf_link_hash_table *ret;
1809 bfd_size_type amt = sizeof (struct bfinfdpic_elf_link_hash_table);
1810
1811 ret = bfd_zalloc (abfd, amt);
1812 if (ret == NULL)
1813 return NULL;
1814
1815 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1816 _bfd_elf_link_hash_newfunc,
1817 sizeof (struct elf_link_hash_entry)))
1818 {
1819 free (ret);
1820 return NULL;
1821 }
1822
1823 return &ret->elf.root;
1824 }
1825
1826 /* Decide whether a reference to a symbol can be resolved locally or
1827 not. If the symbol is protected, we want the local address, but
1828 its function descriptor must be assigned by the dynamic linker. */
1829 #define BFINFDPIC_SYM_LOCAL(INFO, H) \
1830 (_bfd_elf_symbol_refs_local_p ((H), (INFO), 1) \
1831 || ! elf_hash_table (INFO)->dynamic_sections_created)
1832 #define BFINFDPIC_FUNCDESC_LOCAL(INFO, H) \
1833 ((H)->dynindx == -1 || ! elf_hash_table (INFO)->dynamic_sections_created)
1834
1835 /* This structure collects information on what kind of GOT, PLT or
1836 function descriptors are required by relocations that reference a
1837 certain symbol. */
1838 struct bfinfdpic_relocs_info
1839 {
1840 /* The index of the symbol, as stored in the relocation r_info, if
1841 we have a local symbol; -1 otherwise. */
1842 long symndx;
1843 union
1844 {
1845 /* The input bfd in which the symbol is defined, if it's a local
1846 symbol. */
1847 bfd *abfd;
1848 /* If symndx == -1, the hash table entry corresponding to a global
1849 symbol (even if it turns out to bind locally, in which case it
1850 should ideally be replaced with section's symndx + addend). */
1851 struct elf_link_hash_entry *h;
1852 } d;
1853 /* The addend of the relocation that references the symbol. */
1854 bfd_vma addend;
1855
1856 /* The fields above are used to identify an entry. The fields below
1857 contain information on how an entry is used and, later on, which
1858 locations it was assigned. */
1859 /* The following 2 fields record whether the symbol+addend above was
1860 ever referenced with a GOT relocation. The 17M4 suffix indicates a
1861 GOT17M4 relocation; hilo is used for GOTLO/GOTHI pairs. */
1862 unsigned got17m4;
1863 unsigned gothilo;
1864 /* Whether a FUNCDESC relocation references symbol+addend. */
1865 unsigned fd;
1866 /* Whether a FUNCDESC_GOT relocation references symbol+addend. */
1867 unsigned fdgot17m4;
1868 unsigned fdgothilo;
1869 /* Whether a FUNCDESC_GOTOFF relocation references symbol+addend. */
1870 unsigned fdgoff17m4;
1871 unsigned fdgoffhilo;
1872 /* Whether symbol+addend is referenced with GOTOFF17M4, GOTOFFLO or
1873 GOTOFFHI relocations. The addend doesn't really matter, since we
1874 envision that this will only be used to check whether the symbol
1875 is mapped to the same segment as the got. */
1876 unsigned gotoff;
1877 /* Whether symbol+addend is referenced by a LABEL24 relocation. */
1878 unsigned call;
1879 /* Whether symbol+addend is referenced by a 32 or FUNCDESC_VALUE
1880 relocation. */
1881 unsigned sym;
1882 /* Whether we need a PLT entry for a symbol. Should be implied by
1883 something like:
1884 (call && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h)) */
1885 unsigned plt:1;
1886 /* Whether a function descriptor should be created in this link unit
1887 for symbol+addend. Should be implied by something like:
1888 (plt || fdgotoff17m4 || fdgotofflohi
1889 || ((fd || fdgot17m4 || fdgothilo)
1890 && (symndx != -1 || BFINFDPIC_FUNCDESC_LOCAL (info, d.h)))) */
1891 unsigned privfd:1;
1892 /* Whether a lazy PLT entry is needed for this symbol+addend.
1893 Should be implied by something like:
1894 (privfd && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h)
1895 && ! (info->flags & DF_BIND_NOW)) */
1896 unsigned lazyplt:1;
1897 /* Whether we've already emitted GOT relocations and PLT entries as
1898 needed for this symbol. */
1899 unsigned done:1;
1900
1901 /* The number of R_BFIN_BYTE4_DATA, R_BFIN_FUNCDESC and R_BFIN_FUNCDESC_VALUE
1902 relocations referencing the symbol. */
1903 unsigned relocs32, relocsfd, relocsfdv;
1904
1905 /* The number of .rofixups entries and dynamic relocations allocated
1906 for this symbol, minus any that might have already been used. */
1907 unsigned fixups, dynrelocs;
1908
1909 /* The offsets of the GOT entries assigned to symbol+addend, to the
1910 function descriptor's address, and to a function descriptor,
1911 respectively. Should be zero if unassigned. The offsets are
1912 counted from the value that will be assigned to the PIC register,
1913 not from the beginning of the .got section. */
1914 bfd_signed_vma got_entry, fdgot_entry, fd_entry;
1915 /* The offsets of the PLT entries assigned to symbol+addend,
1916 non-lazy and lazy, respectively. If unassigned, should be
1917 (bfd_vma)-1. */
1918 bfd_vma plt_entry, lzplt_entry;
1919 };
1920
1921 /* Compute a hash with the key fields of an bfinfdpic_relocs_info entry. */
1922 static hashval_t
1923 bfinfdpic_relocs_info_hash (const void *entry_)
1924 {
1925 const struct bfinfdpic_relocs_info *entry = entry_;
1926
1927 return (entry->symndx == -1
1928 ? (long) entry->d.h->root.root.hash
1929 : entry->symndx + (long) entry->d.abfd->id * 257) + entry->addend;
1930 }
1931
1932 /* Test whether the key fields of two bfinfdpic_relocs_info entries are
1933 identical. */
1934 static int
1935 bfinfdpic_relocs_info_eq (const void *entry1, const void *entry2)
1936 {
1937 const struct bfinfdpic_relocs_info *e1 = entry1;
1938 const struct bfinfdpic_relocs_info *e2 = entry2;
1939
1940 return e1->symndx == e2->symndx && e1->addend == e2->addend
1941 && (e1->symndx == -1 ? e1->d.h == e2->d.h : e1->d.abfd == e2->d.abfd);
1942 }
1943
1944 /* Find or create an entry in a hash table HT that matches the key
1945 fields of the given ENTRY. If it's not found, memory for a new
1946 entry is allocated in ABFD's obstack. */
1947 static struct bfinfdpic_relocs_info *
1948 bfinfdpic_relocs_info_find (struct htab *ht,
1949 bfd *abfd,
1950 const struct bfinfdpic_relocs_info *entry,
1951 enum insert_option insert)
1952 {
1953 struct bfinfdpic_relocs_info **loc;
1954
1955 if (!ht)
1956 return NULL;
1957
1958 loc = (struct bfinfdpic_relocs_info **) htab_find_slot (ht, entry, insert);
1959
1960 if (! loc)
1961 return NULL;
1962
1963 if (*loc)
1964 return *loc;
1965
1966 *loc = bfd_zalloc (abfd, sizeof (**loc));
1967
1968 if (! *loc)
1969 return *loc;
1970
1971 (*loc)->symndx = entry->symndx;
1972 (*loc)->d = entry->d;
1973 (*loc)->addend = entry->addend;
1974 (*loc)->plt_entry = (bfd_vma)-1;
1975 (*loc)->lzplt_entry = (bfd_vma)-1;
1976
1977 return *loc;
1978 }
1979
1980 /* Obtain the address of the entry in HT associated with H's symbol +
1981 addend, creating a new entry if none existed. ABFD is only used
1982 for memory allocation purposes. */
1983 inline static struct bfinfdpic_relocs_info *
1984 bfinfdpic_relocs_info_for_global (struct htab *ht,
1985 bfd *abfd,
1986 struct elf_link_hash_entry *h,
1987 bfd_vma addend,
1988 enum insert_option insert)
1989 {
1990 struct bfinfdpic_relocs_info entry;
1991
1992 entry.symndx = -1;
1993 entry.d.h = h;
1994 entry.addend = addend;
1995
1996 return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert);
1997 }
1998
1999 /* Obtain the address of the entry in HT associated with the SYMNDXth
2000 local symbol of the input bfd ABFD, plus the addend, creating a new
2001 entry if none existed. */
2002 inline static struct bfinfdpic_relocs_info *
2003 bfinfdpic_relocs_info_for_local (struct htab *ht,
2004 bfd *abfd,
2005 long symndx,
2006 bfd_vma addend,
2007 enum insert_option insert)
2008 {
2009 struct bfinfdpic_relocs_info entry;
2010
2011 entry.symndx = symndx;
2012 entry.d.abfd = abfd;
2013 entry.addend = addend;
2014
2015 return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert);
2016 }
2017
2018 /* Merge fields set by check_relocs() of two entries that end up being
2019 mapped to the same (presumably global) symbol. */
2020
2021 inline static void
2022 bfinfdpic_pic_merge_early_relocs_info (struct bfinfdpic_relocs_info *e2,
2023 struct bfinfdpic_relocs_info const *e1)
2024 {
2025 e2->got17m4 |= e1->got17m4;
2026 e2->gothilo |= e1->gothilo;
2027 e2->fd |= e1->fd;
2028 e2->fdgot17m4 |= e1->fdgot17m4;
2029 e2->fdgothilo |= e1->fdgothilo;
2030 e2->fdgoff17m4 |= e1->fdgoff17m4;
2031 e2->fdgoffhilo |= e1->fdgoffhilo;
2032 e2->gotoff |= e1->gotoff;
2033 e2->call |= e1->call;
2034 e2->sym |= e1->sym;
2035 }
2036
2037 /* Every block of 65535 lazy PLT entries shares a single call to the
2038 resolver, inserted in the 32768th lazy PLT entry (i.e., entry #
2039 32767, counting from 0). All other lazy PLT entries branch to it
2040 in a single instruction. */
2041
2042 #define LZPLT_RESOLVER_EXTRA 10
2043 #define LZPLT_NORMAL_SIZE 6
2044 #define LZPLT_ENTRIES 1362
2045
2046 #define BFINFDPIC_LZPLT_BLOCK_SIZE ((bfd_vma) LZPLT_NORMAL_SIZE * LZPLT_ENTRIES + LZPLT_RESOLVER_EXTRA)
2047 #define BFINFDPIC_LZPLT_RESOLV_LOC (LZPLT_NORMAL_SIZE * LZPLT_ENTRIES / 2)
2048
2049 /* Add a dynamic relocation to the SRELOC section. */
2050
2051 inline static bfd_vma
2052 _bfinfdpic_add_dyn_reloc (bfd *output_bfd, asection *sreloc, bfd_vma offset,
2053 int reloc_type, long dynindx, bfd_vma addend,
2054 struct bfinfdpic_relocs_info *entry)
2055 {
2056 Elf_Internal_Rela outrel;
2057 bfd_vma reloc_offset;
2058
2059 outrel.r_offset = offset;
2060 outrel.r_info = ELF32_R_INFO (dynindx, reloc_type);
2061 outrel.r_addend = addend;
2062
2063 reloc_offset = sreloc->reloc_count * sizeof (Elf32_External_Rel);
2064 BFD_ASSERT (reloc_offset < sreloc->size);
2065 bfd_elf32_swap_reloc_out (output_bfd, &outrel,
2066 sreloc->contents + reloc_offset);
2067 sreloc->reloc_count++;
2068
2069 /* If the entry's index is zero, this relocation was probably to a
2070 linkonce section that got discarded. We reserved a dynamic
2071 relocation, but it was for another entry than the one we got at
2072 the time of emitting the relocation. Unfortunately there's no
2073 simple way for us to catch this situation, since the relocation
2074 is cleared right before calling relocate_section, at which point
2075 we no longer know what the relocation used to point to. */
2076 if (entry->symndx)
2077 {
2078 BFD_ASSERT (entry->dynrelocs > 0);
2079 entry->dynrelocs--;
2080 }
2081
2082 return reloc_offset;
2083 }
2084
2085 /* Add a fixup to the ROFIXUP section. */
2086
2087 static bfd_vma
2088 _bfinfdpic_add_rofixup (bfd *output_bfd, asection *rofixup, bfd_vma offset,
2089 struct bfinfdpic_relocs_info *entry)
2090 {
2091 bfd_vma fixup_offset;
2092
2093 if (rofixup->flags & SEC_EXCLUDE)
2094 return -1;
2095
2096 fixup_offset = rofixup->reloc_count * 4;
2097 if (rofixup->contents)
2098 {
2099 BFD_ASSERT (fixup_offset < rofixup->size);
2100 bfd_put_32 (output_bfd, offset, rofixup->contents + fixup_offset);
2101 }
2102 rofixup->reloc_count++;
2103
2104 if (entry && entry->symndx)
2105 {
2106 /* See discussion about symndx == 0 in _bfinfdpic_add_dyn_reloc
2107 above. */
2108 BFD_ASSERT (entry->fixups > 0);
2109 entry->fixups--;
2110 }
2111
2112 return fixup_offset;
2113 }
2114
2115 /* Find the segment number in which OSEC, and output section, is
2116 located. */
2117
2118 static unsigned
2119 _bfinfdpic_osec_to_segment (bfd *output_bfd, asection *osec)
2120 {
2121 Elf_Internal_Phdr *p = _bfd_elf_find_segment_containing_section (output_bfd, osec);
2122
2123 return (p != NULL) ? p - elf_tdata (output_bfd)->phdr : -1;
2124 }
2125
2126 inline static bfd_boolean
2127 _bfinfdpic_osec_readonly_p (bfd *output_bfd, asection *osec)
2128 {
2129 unsigned seg = _bfinfdpic_osec_to_segment (output_bfd, osec);
2130
2131 return ! (elf_tdata (output_bfd)->phdr[seg].p_flags & PF_W);
2132 }
2133
2134 /* Generate relocations for GOT entries, function descriptors, and
2135 code for PLT and lazy PLT entries. */
2136
2137 inline static bfd_boolean
2138 _bfinfdpic_emit_got_relocs_plt_entries (struct bfinfdpic_relocs_info *entry,
2139 bfd *output_bfd,
2140 struct bfd_link_info *info,
2141 asection *sec,
2142 Elf_Internal_Sym *sym,
2143 bfd_vma addend)
2144
2145 {
2146 bfd_vma fd_lazy_rel_offset = (bfd_vma)-1;
2147 int dynindx = -1;
2148
2149 if (entry->done)
2150 return TRUE;
2151 entry->done = 1;
2152
2153 if (entry->got_entry || entry->fdgot_entry || entry->fd_entry)
2154 {
2155 /* If the symbol is dynamic, consider it for dynamic
2156 relocations, otherwise decay to section + offset. */
2157 if (entry->symndx == -1 && entry->d.h->dynindx != -1)
2158 dynindx = entry->d.h->dynindx;
2159 else
2160 {
2161 if (sec
2162 && sec->output_section
2163 && ! bfd_is_abs_section (sec->output_section)
2164 && ! bfd_is_und_section (sec->output_section))
2165 dynindx = elf_section_data (sec->output_section)->dynindx;
2166 else
2167 dynindx = 0;
2168 }
2169 }
2170
2171 /* Generate relocation for GOT entry pointing to the symbol. */
2172 if (entry->got_entry)
2173 {
2174 int idx = dynindx;
2175 bfd_vma ad = addend;
2176
2177 /* If the symbol is dynamic but binds locally, use
2178 section+offset. */
2179 if (sec && (entry->symndx != -1
2180 || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
2181 {
2182 if (entry->symndx == -1)
2183 ad += entry->d.h->root.u.def.value;
2184 else
2185 ad += sym->st_value;
2186 ad += sec->output_offset;
2187 if (sec->output_section && elf_section_data (sec->output_section))
2188 idx = elf_section_data (sec->output_section)->dynindx;
2189 else
2190 idx = 0;
2191 }
2192
2193 /* If we're linking an executable at a fixed address, we can
2194 omit the dynamic relocation as long as the symbol is local to
2195 this module. */
2196 if (info->executable && !info->pie
2197 && (entry->symndx != -1
2198 || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
2199 {
2200 if (sec)
2201 ad += sec->output_section->vma;
2202 if (entry->symndx != -1
2203 || entry->d.h->root.type != bfd_link_hash_undefweak)
2204 _bfinfdpic_add_rofixup (output_bfd,
2205 bfinfdpic_gotfixup_section (info),
2206 bfinfdpic_got_section (info)->output_section
2207 ->vma
2208 + bfinfdpic_got_section (info)->output_offset
2209 + bfinfdpic_got_initial_offset (info)
2210 + entry->got_entry, entry);
2211 }
2212 else
2213 _bfinfdpic_add_dyn_reloc (output_bfd, bfinfdpic_gotrel_section (info),
2214 _bfd_elf_section_offset
2215 (output_bfd, info,
2216 bfinfdpic_got_section (info),
2217 bfinfdpic_got_initial_offset (info)
2218 + entry->got_entry)
2219 + bfinfdpic_got_section (info)
2220 ->output_section->vma
2221 + bfinfdpic_got_section (info)->output_offset,
2222 R_BFIN_BYTE4_DATA, idx, ad, entry);
2223
2224 bfd_put_32 (output_bfd, ad,
2225 bfinfdpic_got_section (info)->contents
2226 + bfinfdpic_got_initial_offset (info)
2227 + entry->got_entry);
2228 }
2229
2230 /* Generate relocation for GOT entry pointing to a canonical
2231 function descriptor. */
2232 if (entry->fdgot_entry)
2233 {
2234 int reloc, idx;
2235 bfd_vma ad = 0;
2236
2237 if (! (entry->symndx == -1
2238 && entry->d.h->root.type == bfd_link_hash_undefweak
2239 && BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
2240 {
2241 /* If the symbol is dynamic and there may be dynamic symbol
2242 resolution because we are, or are linked with, a shared
2243 library, emit a FUNCDESC relocation such that the dynamic
2244 linker will allocate the function descriptor. If the
2245 symbol needs a non-local function descriptor but binds
2246 locally (e.g., its visibility is protected, emit a
2247 dynamic relocation decayed to section+offset. */
2248 if (entry->symndx == -1
2249 && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h)
2250 && BFINFDPIC_SYM_LOCAL (info, entry->d.h)
2251 && !(info->executable && !info->pie))
2252 {
2253 reloc = R_BFIN_FUNCDESC;
2254 idx = elf_section_data (entry->d.h->root.u.def.section
2255 ->output_section)->dynindx;
2256 ad = entry->d.h->root.u.def.section->output_offset
2257 + entry->d.h->root.u.def.value;
2258 }
2259 else if (entry->symndx == -1
2260 && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h))
2261 {
2262 reloc = R_BFIN_FUNCDESC;
2263 idx = dynindx;
2264 ad = addend;
2265 if (ad)
2266 return FALSE;
2267 }
2268 else
2269 {
2270 /* Otherwise, we know we have a private function descriptor,
2271 so reference it directly. */
2272 if (elf_hash_table (info)->dynamic_sections_created)
2273 BFD_ASSERT (entry->privfd);
2274 reloc = R_BFIN_BYTE4_DATA;
2275 idx = elf_section_data (bfinfdpic_got_section (info)
2276 ->output_section)->dynindx;
2277 ad = bfinfdpic_got_section (info)->output_offset
2278 + bfinfdpic_got_initial_offset (info) + entry->fd_entry;
2279 }
2280
2281 /* If there is room for dynamic symbol resolution, emit the
2282 dynamic relocation. However, if we're linking an
2283 executable at a fixed location, we won't have emitted a
2284 dynamic symbol entry for the got section, so idx will be
2285 zero, which means we can and should compute the address
2286 of the private descriptor ourselves. */
2287 if (info->executable && !info->pie
2288 && (entry->symndx != -1
2289 || BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h)))
2290 {
2291 ad += bfinfdpic_got_section (info)->output_section->vma;
2292 _bfinfdpic_add_rofixup (output_bfd,
2293 bfinfdpic_gotfixup_section (info),
2294 bfinfdpic_got_section (info)
2295 ->output_section->vma
2296 + bfinfdpic_got_section (info)
2297 ->output_offset
2298 + bfinfdpic_got_initial_offset (info)
2299 + entry->fdgot_entry, entry);
2300 }
2301 else
2302 _bfinfdpic_add_dyn_reloc (output_bfd,
2303 bfinfdpic_gotrel_section (info),
2304 _bfd_elf_section_offset
2305 (output_bfd, info,
2306 bfinfdpic_got_section (info),
2307 bfinfdpic_got_initial_offset (info)
2308 + entry->fdgot_entry)
2309 + bfinfdpic_got_section (info)
2310 ->output_section->vma
2311 + bfinfdpic_got_section (info)
2312 ->output_offset,
2313 reloc, idx, ad, entry);
2314 }
2315
2316 bfd_put_32 (output_bfd, ad,
2317 bfinfdpic_got_section (info)->contents
2318 + bfinfdpic_got_initial_offset (info)
2319 + entry->fdgot_entry);
2320 }
2321
2322 /* Generate relocation to fill in a private function descriptor in
2323 the GOT. */
2324 if (entry->fd_entry)
2325 {
2326 int idx = dynindx;
2327 bfd_vma ad = addend;
2328 bfd_vma ofst;
2329 long lowword, highword;
2330
2331 /* If the symbol is dynamic but binds locally, use
2332 section+offset. */
2333 if (sec && (entry->symndx != -1
2334 || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
2335 {
2336 if (entry->symndx == -1)
2337 ad += entry->d.h->root.u.def.value;
2338 else
2339 ad += sym->st_value;
2340 ad += sec->output_offset;
2341 if (sec->output_section && elf_section_data (sec->output_section))
2342 idx = elf_section_data (sec->output_section)->dynindx;
2343 else
2344 idx = 0;
2345 }
2346
2347 /* If we're linking an executable at a fixed address, we can
2348 omit the dynamic relocation as long as the symbol is local to
2349 this module. */
2350 if (info->executable && !info->pie
2351 && (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
2352 {
2353 if (sec)
2354 ad += sec->output_section->vma;
2355 ofst = 0;
2356 if (entry->symndx != -1
2357 || entry->d.h->root.type != bfd_link_hash_undefweak)
2358 {
2359 _bfinfdpic_add_rofixup (output_bfd,
2360 bfinfdpic_gotfixup_section (info),
2361 bfinfdpic_got_section (info)
2362 ->output_section->vma
2363 + bfinfdpic_got_section (info)
2364 ->output_offset
2365 + bfinfdpic_got_initial_offset (info)
2366 + entry->fd_entry, entry);
2367 _bfinfdpic_add_rofixup (output_bfd,
2368 bfinfdpic_gotfixup_section (info),
2369 bfinfdpic_got_section (info)
2370 ->output_section->vma
2371 + bfinfdpic_got_section (info)
2372 ->output_offset
2373 + bfinfdpic_got_initial_offset (info)
2374 + entry->fd_entry + 4, entry);
2375 }
2376 }
2377 else
2378 {
2379 ofst
2380 = _bfinfdpic_add_dyn_reloc (output_bfd,
2381 entry->lazyplt
2382 ? bfinfdpic_pltrel_section (info)
2383 : bfinfdpic_gotrel_section (info),
2384 _bfd_elf_section_offset
2385 (output_bfd, info,
2386 bfinfdpic_got_section (info),
2387 bfinfdpic_got_initial_offset (info)
2388 + entry->fd_entry)
2389 + bfinfdpic_got_section (info)
2390 ->output_section->vma
2391 + bfinfdpic_got_section (info)
2392 ->output_offset,
2393 R_BFIN_FUNCDESC_VALUE, idx, ad, entry);
2394 }
2395
2396 /* If we've omitted the dynamic relocation, just emit the fixed
2397 addresses of the symbol and of the local GOT base offset. */
2398 if (info->executable && !info->pie && sec && sec->output_section)
2399 {
2400 lowword = ad;
2401 highword = bfinfdpic_got_section (info)->output_section->vma
2402 + bfinfdpic_got_section (info)->output_offset
2403 + bfinfdpic_got_initial_offset (info);
2404 }
2405 else if (entry->lazyplt)
2406 {
2407 if (ad)
2408 return FALSE;
2409
2410 fd_lazy_rel_offset = ofst;
2411
2412 /* A function descriptor used for lazy or local resolving is
2413 initialized such that its high word contains the output
2414 section index in which the PLT entries are located, and
2415 the low word contains the address of the lazy PLT entry
2416 entry point, that must be within the memory region
2417 assigned to that section. */
2418 lowword = entry->lzplt_entry + 4
2419 + bfinfdpic_plt_section (info)->output_offset
2420 + bfinfdpic_plt_section (info)->output_section->vma;
2421 highword = _bfinfdpic_osec_to_segment
2422 (output_bfd, bfinfdpic_plt_section (info)->output_section);
2423 }
2424 else
2425 {
2426 /* A function descriptor for a local function gets the index
2427 of the section. For a non-local function, it's
2428 disregarded. */
2429 lowword = ad;
2430 if (sec == NULL
2431 || (entry->symndx == -1 && entry->d.h->dynindx != -1
2432 && entry->d.h->dynindx == idx))
2433 highword = 0;
2434 else
2435 highword = _bfinfdpic_osec_to_segment
2436 (output_bfd, sec->output_section);
2437 }
2438
2439 bfd_put_32 (output_bfd, lowword,
2440 bfinfdpic_got_section (info)->contents
2441 + bfinfdpic_got_initial_offset (info)
2442 + entry->fd_entry);
2443 bfd_put_32 (output_bfd, highword,
2444 bfinfdpic_got_section (info)->contents
2445 + bfinfdpic_got_initial_offset (info)
2446 + entry->fd_entry + 4);
2447 }
2448
2449 /* Generate code for the PLT entry. */
2450 if (entry->plt_entry != (bfd_vma) -1)
2451 {
2452 bfd_byte *plt_code = bfinfdpic_plt_section (info)->contents
2453 + entry->plt_entry;
2454
2455 BFD_ASSERT (entry->fd_entry);
2456
2457 /* Figure out what kind of PLT entry we need, depending on the
2458 location of the function descriptor within the GOT. */
2459 if (entry->fd_entry >= -(1 << (18 - 1))
2460 && entry->fd_entry + 4 < (1 << (18 - 1)))
2461 {
2462 /* P1 = [P3 + fd_entry]; P3 = [P3 + fd_entry + 4] */
2463 bfd_put_32 (output_bfd,
2464 0xe519 | ((entry->fd_entry << 14) & 0xFFFF0000),
2465 plt_code);
2466 bfd_put_32 (output_bfd,
2467 0xe51b | (((entry->fd_entry + 4) << 14) & 0xFFFF0000),
2468 plt_code + 4);
2469 plt_code += 8;
2470 }
2471 else
2472 {
2473 /* P1.L = fd_entry; P1.H = fd_entry;
2474 P3 = P3 + P1;
2475 P1 = [P3];
2476 P3 = [P3 + 4]; */
2477 bfd_put_32 (output_bfd,
2478 0xe109 | (entry->fd_entry << 16),
2479 plt_code);
2480 bfd_put_32 (output_bfd,
2481 0xe149 | (entry->fd_entry & 0xFFFF0000),
2482 plt_code + 4);
2483 bfd_put_16 (output_bfd, 0x5ad9, plt_code + 8);
2484 bfd_put_16 (output_bfd, 0x9159, plt_code + 10);
2485 bfd_put_16 (output_bfd, 0xac5b, plt_code + 12);
2486 plt_code += 14;
2487 }
2488 /* JUMP (P1) */
2489 bfd_put_16 (output_bfd, 0x0051, plt_code);
2490 }
2491
2492 /* Generate code for the lazy PLT entry. */
2493 if (entry->lzplt_entry != (bfd_vma) -1)
2494 {
2495 bfd_byte *lzplt_code = bfinfdpic_plt_section (info)->contents
2496 + entry->lzplt_entry;
2497 bfd_vma resolverStub_addr;
2498
2499 bfd_put_32 (output_bfd, fd_lazy_rel_offset, lzplt_code);
2500 lzplt_code += 4;
2501
2502 resolverStub_addr = entry->lzplt_entry / BFINFDPIC_LZPLT_BLOCK_SIZE
2503 * BFINFDPIC_LZPLT_BLOCK_SIZE + BFINFDPIC_LZPLT_RESOLV_LOC;
2504 if (resolverStub_addr >= bfinfdpic_plt_initial_offset (info))
2505 resolverStub_addr = bfinfdpic_plt_initial_offset (info) - LZPLT_NORMAL_SIZE - LZPLT_RESOLVER_EXTRA;
2506
2507 if (entry->lzplt_entry == resolverStub_addr)
2508 {
2509 /* This is a lazy PLT entry that includes a resolver call.
2510 P2 = [P3];
2511 R3 = [P3 + 4];
2512 JUMP (P2); */
2513 bfd_put_32 (output_bfd,
2514 0xa05b915a,
2515 lzplt_code);
2516 bfd_put_16 (output_bfd, 0x0052, lzplt_code + 4);
2517 }
2518 else
2519 {
2520 /* JUMP.S resolverStub */
2521 bfd_put_16 (output_bfd,
2522 0x2000
2523 | (((resolverStub_addr - entry->lzplt_entry)
2524 / 2) & (((bfd_vma)1 << 12) - 1)),
2525 lzplt_code);
2526 }
2527 }
2528
2529 return TRUE;
2530 }
2531 \f
2532 /* Relocate an Blackfin ELF section.
2533
2534 The RELOCATE_SECTION function is called by the new ELF backend linker
2535 to handle the relocations for a section.
2536
2537 The relocs are always passed as Rela structures; if the section
2538 actually uses Rel structures, the r_addend field will always be
2539 zero.
2540
2541 This function is responsible for adjusting the section contents as
2542 necessary, and (if using Rela relocs and generating a relocatable
2543 output file) adjusting the reloc addend as necessary.
2544
2545 This function does not have to worry about setting the reloc
2546 address or the reloc symbol index.
2547
2548 LOCAL_SYMS is a pointer to the swapped in local symbols.
2549
2550 LOCAL_SECTIONS is an array giving the section in the input file
2551 corresponding to the st_shndx field of each local symbol.
2552
2553 The global hash table entry for the global symbols can be found
2554 via elf_sym_hashes (input_bfd).
2555
2556 When generating relocatable output, this function must handle
2557 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
2558 going to be the section symbol corresponding to the output
2559 section, which means that the addend must be adjusted
2560 accordingly. */
2561
2562 static bfd_boolean
2563 bfinfdpic_relocate_section (bfd * output_bfd,
2564 struct bfd_link_info *info,
2565 bfd * input_bfd,
2566 asection * input_section,
2567 bfd_byte * contents,
2568 Elf_Internal_Rela * relocs,
2569 Elf_Internal_Sym * local_syms,
2570 asection ** local_sections)
2571 {
2572 Elf_Internal_Shdr *symtab_hdr;
2573 struct elf_link_hash_entry **sym_hashes;
2574 Elf_Internal_Rela *rel;
2575 Elf_Internal_Rela *relend;
2576 unsigned isec_segment, got_segment, plt_segment,
2577 check_segment[2];
2578 int silence_segment_error = !(info->shared || info->pie);
2579
2580 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
2581 sym_hashes = elf_sym_hashes (input_bfd);
2582 relend = relocs + input_section->reloc_count;
2583
2584 isec_segment = _bfinfdpic_osec_to_segment (output_bfd,
2585 input_section->output_section);
2586 if (IS_FDPIC (output_bfd) && bfinfdpic_got_section (info))
2587 got_segment = _bfinfdpic_osec_to_segment (output_bfd,
2588 bfinfdpic_got_section (info)
2589 ->output_section);
2590 else
2591 got_segment = -1;
2592 if (IS_FDPIC (output_bfd) && elf_hash_table (info)->dynamic_sections_created)
2593 plt_segment = _bfinfdpic_osec_to_segment (output_bfd,
2594 bfinfdpic_plt_section (info)
2595 ->output_section);
2596 else
2597 plt_segment = -1;
2598
2599 for (rel = relocs; rel < relend; rel ++)
2600 {
2601 reloc_howto_type *howto;
2602 unsigned long r_symndx;
2603 Elf_Internal_Sym *sym;
2604 asection *sec;
2605 struct elf_link_hash_entry *h;
2606 bfd_vma relocation;
2607 bfd_reloc_status_type r;
2608 const char * name = NULL;
2609 int r_type;
2610 asection *osec;
2611 struct bfinfdpic_relocs_info *picrel;
2612 bfd_vma orig_addend = rel->r_addend;
2613
2614 r_type = ELF32_R_TYPE (rel->r_info);
2615
2616 if (r_type == R_BFIN_GNU_VTINHERIT
2617 || r_type == R_BFIN_GNU_VTENTRY)
2618 continue;
2619
2620 r_symndx = ELF32_R_SYM (rel->r_info);
2621 howto = bfin_reloc_type_lookup (input_bfd, r_type);
2622 if (howto == NULL)
2623 {
2624 bfd_set_error (bfd_error_bad_value);
2625 return FALSE;
2626 }
2627
2628 h = NULL;
2629 sym = NULL;
2630 sec = NULL;
2631
2632 if (r_symndx < symtab_hdr->sh_info)
2633 {
2634 sym = local_syms + r_symndx;
2635 osec = sec = local_sections [r_symndx];
2636 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2637
2638 name = bfd_elf_string_from_elf_section
2639 (input_bfd, symtab_hdr->sh_link, sym->st_name);
2640 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
2641 }
2642 else
2643 {
2644 bfd_boolean warned;
2645 bfd_boolean unresolved_reloc;
2646
2647 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2648 r_symndx, symtab_hdr, sym_hashes,
2649 h, sec, relocation,
2650 unresolved_reloc, warned);
2651 osec = sec;
2652 }
2653
2654 if (sec != NULL && elf_discarded_section (sec))
2655 {
2656 /* For relocs against symbols from removed linkonce sections,
2657 or sections discarded by a linker script, we just want the
2658 section contents zeroed. Avoid any special processing. */
2659 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2660 rel->r_info = 0;
2661 rel->r_addend = 0;
2662 continue;
2663 }
2664
2665 if (info->relocatable)
2666 continue;
2667
2668 if (h != NULL
2669 && (h->root.type == bfd_link_hash_defined
2670 || h->root.type == bfd_link_hash_defweak)
2671 && !BFINFDPIC_SYM_LOCAL (info, h))
2672 {
2673 osec = sec = NULL;
2674 relocation = 0;
2675 }
2676
2677 switch (r_type)
2678 {
2679 case R_BFIN_PCREL24:
2680 case R_BFIN_PCREL24_JUMP_L:
2681 case R_BFIN_BYTE4_DATA:
2682 if (! IS_FDPIC (output_bfd))
2683 goto non_fdpic;
2684
2685 case R_BFIN_GOT17M4:
2686 case R_BFIN_GOTHI:
2687 case R_BFIN_GOTLO:
2688 case R_BFIN_FUNCDESC_GOT17M4:
2689 case R_BFIN_FUNCDESC_GOTHI:
2690 case R_BFIN_FUNCDESC_GOTLO:
2691 case R_BFIN_GOTOFF17M4:
2692 case R_BFIN_GOTOFFHI:
2693 case R_BFIN_GOTOFFLO:
2694 case R_BFIN_FUNCDESC_GOTOFF17M4:
2695 case R_BFIN_FUNCDESC_GOTOFFHI:
2696 case R_BFIN_FUNCDESC_GOTOFFLO:
2697 case R_BFIN_FUNCDESC:
2698 case R_BFIN_FUNCDESC_VALUE:
2699 if (h != NULL)
2700 picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info
2701 (info), input_bfd, h,
2702 orig_addend, INSERT);
2703 else
2704 /* In order to find the entry we created before, we must
2705 use the original addend, not the one that may have been
2706 modified by _bfd_elf_rela_local_sym(). */
2707 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info
2708 (info), input_bfd, r_symndx,
2709 orig_addend, INSERT);
2710 if (! picrel)
2711 return FALSE;
2712
2713 if (!_bfinfdpic_emit_got_relocs_plt_entries (picrel, output_bfd, info,
2714 osec, sym,
2715 rel->r_addend))
2716 {
2717 (*_bfd_error_handler)
2718 (_("%B: relocation at `%A+0x%x' references symbol `%s' with nonzero addend"),
2719 input_bfd, input_section, rel->r_offset, name);
2720 return FALSE;
2721
2722 }
2723
2724 break;
2725
2726 default:
2727 non_fdpic:
2728 picrel = NULL;
2729 if (h && ! BFINFDPIC_SYM_LOCAL (info, h))
2730 {
2731 info->callbacks->warning
2732 (info, _("relocation references symbol not defined in the module"),
2733 name, input_bfd, input_section, rel->r_offset);
2734 return FALSE;
2735 }
2736 break;
2737 }
2738
2739 switch (r_type)
2740 {
2741 case R_BFIN_PCREL24:
2742 case R_BFIN_PCREL24_JUMP_L:
2743 check_segment[0] = isec_segment;
2744 if (! IS_FDPIC (output_bfd))
2745 check_segment[1] = isec_segment;
2746 else if (picrel->plt)
2747 {
2748 relocation = bfinfdpic_plt_section (info)->output_section->vma
2749 + bfinfdpic_plt_section (info)->output_offset
2750 + picrel->plt_entry;
2751 check_segment[1] = plt_segment;
2752 }
2753 /* We don't want to warn on calls to undefined weak symbols,
2754 as calls to them must be protected by non-NULL tests
2755 anyway, and unprotected calls would invoke undefined
2756 behavior. */
2757 else if (picrel->symndx == -1
2758 && picrel->d.h->root.type == bfd_link_hash_undefweak)
2759 check_segment[1] = check_segment[0];
2760 else
2761 check_segment[1] = sec
2762 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section)
2763 : (unsigned)-1;
2764 break;
2765
2766 case R_BFIN_GOT17M4:
2767 case R_BFIN_GOTHI:
2768 case R_BFIN_GOTLO:
2769 relocation = picrel->got_entry;
2770 check_segment[0] = check_segment[1] = got_segment;
2771 break;
2772
2773 case R_BFIN_FUNCDESC_GOT17M4:
2774 case R_BFIN_FUNCDESC_GOTHI:
2775 case R_BFIN_FUNCDESC_GOTLO:
2776 relocation = picrel->fdgot_entry;
2777 check_segment[0] = check_segment[1] = got_segment;
2778 break;
2779
2780 case R_BFIN_GOTOFFHI:
2781 case R_BFIN_GOTOFF17M4:
2782 case R_BFIN_GOTOFFLO:
2783 relocation -= bfinfdpic_got_section (info)->output_section->vma
2784 + bfinfdpic_got_section (info)->output_offset
2785 + bfinfdpic_got_initial_offset (info);
2786 check_segment[0] = got_segment;
2787 check_segment[1] = sec
2788 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section)
2789 : (unsigned)-1;
2790 break;
2791
2792 case R_BFIN_FUNCDESC_GOTOFF17M4:
2793 case R_BFIN_FUNCDESC_GOTOFFHI:
2794 case R_BFIN_FUNCDESC_GOTOFFLO:
2795 relocation = picrel->fd_entry;
2796 check_segment[0] = check_segment[1] = got_segment;
2797 break;
2798
2799 case R_BFIN_FUNCDESC:
2800 {
2801 int dynindx;
2802 bfd_vma addend = rel->r_addend;
2803
2804 if (! (h && h->root.type == bfd_link_hash_undefweak
2805 && BFINFDPIC_SYM_LOCAL (info, h)))
2806 {
2807 /* If the symbol is dynamic and there may be dynamic
2808 symbol resolution because we are or are linked with a
2809 shared library, emit a FUNCDESC relocation such that
2810 the dynamic linker will allocate the function
2811 descriptor. If the symbol needs a non-local function
2812 descriptor but binds locally (e.g., its visibility is
2813 protected, emit a dynamic relocation decayed to
2814 section+offset. */
2815 if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h)
2816 && BFINFDPIC_SYM_LOCAL (info, h)
2817 && !(info->executable && !info->pie))
2818 {
2819 dynindx = elf_section_data (h->root.u.def.section
2820 ->output_section)->dynindx;
2821 addend += h->root.u.def.section->output_offset
2822 + h->root.u.def.value;
2823 }
2824 else if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h))
2825 {
2826 if (addend)
2827 {
2828 info->callbacks->warning
2829 (info, _("R_BFIN_FUNCDESC references dynamic symbol with nonzero addend"),
2830 name, input_bfd, input_section, rel->r_offset);
2831 return FALSE;
2832 }
2833 dynindx = h->dynindx;
2834 }
2835 else
2836 {
2837 /* Otherwise, we know we have a private function
2838 descriptor, so reference it directly. */
2839 BFD_ASSERT (picrel->privfd);
2840 r_type = R_BFIN_BYTE4_DATA;
2841 dynindx = elf_section_data (bfinfdpic_got_section (info)
2842 ->output_section)->dynindx;
2843 addend = bfinfdpic_got_section (info)->output_offset
2844 + bfinfdpic_got_initial_offset (info)
2845 + picrel->fd_entry;
2846 }
2847
2848 /* If there is room for dynamic symbol resolution, emit
2849 the dynamic relocation. However, if we're linking an
2850 executable at a fixed location, we won't have emitted a
2851 dynamic symbol entry for the got section, so idx will
2852 be zero, which means we can and should compute the
2853 address of the private descriptor ourselves. */
2854 if (info->executable && !info->pie
2855 && (!h || BFINFDPIC_FUNCDESC_LOCAL (info, h)))
2856 {
2857 bfd_vma offset;
2858
2859 addend += bfinfdpic_got_section (info)->output_section->vma;
2860 if ((bfd_get_section_flags (output_bfd,
2861 input_section->output_section)
2862 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
2863 {
2864 if (_bfinfdpic_osec_readonly_p (output_bfd,
2865 input_section
2866 ->output_section))
2867 {
2868 info->callbacks->warning
2869 (info,
2870 _("cannot emit fixups in read-only section"),
2871 name, input_bfd, input_section, rel->r_offset);
2872 return FALSE;
2873 }
2874
2875 offset = _bfd_elf_section_offset
2876 (output_bfd, info,
2877 input_section, rel->r_offset);
2878
2879 if (offset != (bfd_vma)-1)
2880 _bfinfdpic_add_rofixup (output_bfd,
2881 bfinfdpic_gotfixup_section
2882 (info),
2883 offset + input_section
2884 ->output_section->vma
2885 + input_section->output_offset,
2886 picrel);
2887 }
2888 }
2889 else if ((bfd_get_section_flags (output_bfd,
2890 input_section->output_section)
2891 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
2892 {
2893 bfd_vma offset;
2894
2895 if (_bfinfdpic_osec_readonly_p (output_bfd,
2896 input_section
2897 ->output_section))
2898 {
2899 info->callbacks->warning
2900 (info,
2901 _("cannot emit dynamic relocations in read-only section"),
2902 name, input_bfd, input_section, rel->r_offset);
2903 return FALSE;
2904 }
2905 offset = _bfd_elf_section_offset (output_bfd, info,
2906 input_section, rel->r_offset);
2907
2908 if (offset != (bfd_vma)-1)
2909 _bfinfdpic_add_dyn_reloc (output_bfd,
2910 bfinfdpic_gotrel_section (info),
2911 offset + input_section
2912 ->output_section->vma
2913 + input_section->output_offset,
2914 r_type,
2915 dynindx, addend, picrel);
2916 }
2917 else
2918 addend += bfinfdpic_got_section (info)->output_section->vma;
2919 }
2920
2921 /* We want the addend in-place because dynamic
2922 relocations are REL. Setting relocation to it should
2923 arrange for it to be installed. */
2924 relocation = addend - rel->r_addend;
2925 }
2926 check_segment[0] = check_segment[1] = got_segment;
2927 break;
2928
2929 case R_BFIN_BYTE4_DATA:
2930 if (! IS_FDPIC (output_bfd))
2931 {
2932 check_segment[0] = check_segment[1] = -1;
2933 break;
2934 }
2935 /* Fall through. */
2936 case R_BFIN_FUNCDESC_VALUE:
2937 {
2938 int dynindx;
2939 bfd_vma addend = rel->r_addend;
2940 bfd_vma offset;
2941 offset = _bfd_elf_section_offset (output_bfd, info,
2942 input_section, rel->r_offset);
2943
2944 /* If the symbol is dynamic but binds locally, use
2945 section+offset. */
2946 if (h && ! BFINFDPIC_SYM_LOCAL (info, h))
2947 {
2948 if (addend && r_type == R_BFIN_FUNCDESC_VALUE)
2949 {
2950 info->callbacks->warning
2951 (info, _("R_BFIN_FUNCDESC_VALUE references dynamic symbol with nonzero addend"),
2952 name, input_bfd, input_section, rel->r_offset);
2953 return FALSE;
2954 }
2955 dynindx = h->dynindx;
2956 }
2957 else
2958 {
2959 if (h)
2960 addend += h->root.u.def.value;
2961 else
2962 addend += sym->st_value;
2963 if (osec)
2964 addend += osec->output_offset;
2965 if (osec && osec->output_section
2966 && ! bfd_is_abs_section (osec->output_section)
2967 && ! bfd_is_und_section (osec->output_section))
2968 dynindx = elf_section_data (osec->output_section)->dynindx;
2969 else
2970 dynindx = 0;
2971 }
2972
2973 /* If we're linking an executable at a fixed address, we
2974 can omit the dynamic relocation as long as the symbol
2975 is defined in the current link unit (which is implied
2976 by its output section not being NULL). */
2977 if (info->executable && !info->pie
2978 && (!h || BFINFDPIC_SYM_LOCAL (info, h)))
2979 {
2980 if (osec)
2981 addend += osec->output_section->vma;
2982 if (IS_FDPIC (input_bfd)
2983 && (bfd_get_section_flags (output_bfd,
2984 input_section->output_section)
2985 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
2986 {
2987 if (_bfinfdpic_osec_readonly_p (output_bfd,
2988 input_section
2989 ->output_section))
2990 {
2991 info->callbacks->warning
2992 (info,
2993 _("cannot emit fixups in read-only section"),
2994 name, input_bfd, input_section, rel->r_offset);
2995 return FALSE;
2996 }
2997 if (!h || h->root.type != bfd_link_hash_undefweak)
2998 {
2999 if (offset != (bfd_vma)-1)
3000 {
3001 _bfinfdpic_add_rofixup (output_bfd,
3002 bfinfdpic_gotfixup_section
3003 (info),
3004 offset + input_section
3005 ->output_section->vma
3006 + input_section->output_offset,
3007 picrel);
3008
3009 if (r_type == R_BFIN_FUNCDESC_VALUE)
3010 _bfinfdpic_add_rofixup
3011 (output_bfd,
3012 bfinfdpic_gotfixup_section (info),
3013 offset + input_section->output_section->vma
3014 + input_section->output_offset + 4, picrel);
3015 }
3016 }
3017 }
3018 }
3019 else
3020 {
3021 if ((bfd_get_section_flags (output_bfd,
3022 input_section->output_section)
3023 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
3024 {
3025 if (_bfinfdpic_osec_readonly_p (output_bfd,
3026 input_section
3027 ->output_section))
3028 {
3029 info->callbacks->warning
3030 (info,
3031 _("cannot emit dynamic relocations in read-only section"),
3032 name, input_bfd, input_section, rel->r_offset);
3033 return FALSE;
3034 }
3035
3036 if (offset != (bfd_vma)-1)
3037 _bfinfdpic_add_dyn_reloc (output_bfd,
3038 bfinfdpic_gotrel_section (info),
3039 offset
3040 + input_section->output_section->vma
3041 + input_section->output_offset,
3042 r_type, dynindx, addend, picrel);
3043 }
3044 else if (osec)
3045 addend += osec->output_section->vma;
3046 /* We want the addend in-place because dynamic
3047 relocations are REL. Setting relocation to it
3048 should arrange for it to be installed. */
3049 relocation = addend - rel->r_addend;
3050 }
3051
3052 if (r_type == R_BFIN_FUNCDESC_VALUE)
3053 {
3054 /* If we've omitted the dynamic relocation, just emit
3055 the fixed addresses of the symbol and of the local
3056 GOT base offset. */
3057 if (info->executable && !info->pie
3058 && (!h || BFINFDPIC_SYM_LOCAL (info, h)))
3059 bfd_put_32 (output_bfd,
3060 bfinfdpic_got_section (info)->output_section->vma
3061 + bfinfdpic_got_section (info)->output_offset
3062 + bfinfdpic_got_initial_offset (info),
3063 contents + rel->r_offset + 4);
3064 else
3065 /* A function descriptor used for lazy or local
3066 resolving is initialized such that its high word
3067 contains the output section index in which the
3068 PLT entries are located, and the low word
3069 contains the offset of the lazy PLT entry entry
3070 point into that section. */
3071 bfd_put_32 (output_bfd,
3072 h && ! BFINFDPIC_SYM_LOCAL (info, h)
3073 ? 0
3074 : _bfinfdpic_osec_to_segment (output_bfd,
3075 sec
3076 ->output_section),
3077 contents + rel->r_offset + 4);
3078 }
3079 }
3080 check_segment[0] = check_segment[1] = got_segment;
3081 break;
3082
3083 default:
3084 check_segment[0] = isec_segment;
3085 check_segment[1] = sec
3086 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section)
3087 : (unsigned)-1;
3088 break;
3089 }
3090
3091 if (check_segment[0] != check_segment[1] && IS_FDPIC (output_bfd))
3092 {
3093 #if 1 /* If you take this out, remove the #error from fdpic-static-6.d
3094 in the ld testsuite. */
3095 /* This helps catch problems in GCC while we can't do more
3096 than static linking. The idea is to test whether the
3097 input file basename is crt0.o only once. */
3098 if (silence_segment_error == 1)
3099 silence_segment_error =
3100 (strlen (input_bfd->filename) == 6
3101 && strcmp (input_bfd->filename, "crt0.o") == 0)
3102 || (strlen (input_bfd->filename) > 6
3103 && strcmp (input_bfd->filename
3104 + strlen (input_bfd->filename) - 7,
3105 "/crt0.o") == 0)
3106 ? -1 : 0;
3107 #endif
3108 if (!silence_segment_error
3109 /* We don't want duplicate errors for undefined
3110 symbols. */
3111 && !(picrel && picrel->symndx == -1
3112 && picrel->d.h->root.type == bfd_link_hash_undefined))
3113 info->callbacks->warning
3114 (info,
3115 (info->shared || info->pie)
3116 ? _("relocations between different segments are not supported")
3117 : _("warning: relocation references a different segment"),
3118 name, input_bfd, input_section, rel->r_offset);
3119 if (!silence_segment_error && (info->shared || info->pie))
3120 return FALSE;
3121 elf_elfheader (output_bfd)->e_flags |= EF_BFIN_PIC;
3122 }
3123
3124 switch (r_type)
3125 {
3126 case R_BFIN_GOTOFFHI:
3127 /* We need the addend to be applied before we shift the
3128 value right. */
3129 relocation += rel->r_addend;
3130 /* Fall through. */
3131 case R_BFIN_GOTHI:
3132 case R_BFIN_FUNCDESC_GOTHI:
3133 case R_BFIN_FUNCDESC_GOTOFFHI:
3134 relocation >>= 16;
3135 /* Fall through. */
3136
3137 case R_BFIN_GOTLO:
3138 case R_BFIN_FUNCDESC_GOTLO:
3139 case R_BFIN_GOTOFFLO:
3140 case R_BFIN_FUNCDESC_GOTOFFLO:
3141 relocation &= 0xffff;
3142 break;
3143
3144 default:
3145 break;
3146 }
3147
3148 switch (r_type)
3149 {
3150 case R_BFIN_PCREL24:
3151 case R_BFIN_PCREL24_JUMP_L:
3152 if (! IS_FDPIC (output_bfd) || ! picrel->plt)
3153 break;
3154 /* Fall through. */
3155
3156 /* When referencing a GOT entry, a function descriptor or a
3157 PLT, we don't want the addend to apply to the reference,
3158 but rather to the referenced symbol. The actual entry
3159 will have already been created taking the addend into
3160 account, so cancel it out here. */
3161 case R_BFIN_GOT17M4:
3162 case R_BFIN_GOTHI:
3163 case R_BFIN_GOTLO:
3164 case R_BFIN_FUNCDESC_GOT17M4:
3165 case R_BFIN_FUNCDESC_GOTHI:
3166 case R_BFIN_FUNCDESC_GOTLO:
3167 case R_BFIN_FUNCDESC_GOTOFF17M4:
3168 case R_BFIN_FUNCDESC_GOTOFFHI:
3169 case R_BFIN_FUNCDESC_GOTOFFLO:
3170 /* Note that we only want GOTOFFHI, not GOTOFFLO or GOTOFF17M4
3171 here, since we do want to apply the addend to the others.
3172 Note that we've applied the addend to GOTOFFHI before we
3173 shifted it right. */
3174 case R_BFIN_GOTOFFHI:
3175 relocation -= rel->r_addend;
3176 break;
3177
3178 default:
3179 break;
3180 }
3181
3182 r = bfin_final_link_relocate (rel, howto, input_bfd, input_section,
3183 contents, rel->r_offset,
3184 relocation, rel->r_addend);
3185
3186 if (r != bfd_reloc_ok)
3187 {
3188 const char * msg = (const char *) NULL;
3189
3190 switch (r)
3191 {
3192 case bfd_reloc_overflow:
3193 r = info->callbacks->reloc_overflow
3194 (info, (h ? &h->root : NULL), name, howto->name,
3195 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3196 break;
3197
3198 case bfd_reloc_undefined:
3199 r = info->callbacks->undefined_symbol
3200 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
3201 break;
3202
3203 case bfd_reloc_outofrange:
3204 msg = _("internal error: out of range error");
3205 break;
3206
3207 case bfd_reloc_notsupported:
3208 msg = _("internal error: unsupported relocation error");
3209 break;
3210
3211 case bfd_reloc_dangerous:
3212 msg = _("internal error: dangerous relocation");
3213 break;
3214
3215 default:
3216 msg = _("internal error: unknown error");
3217 break;
3218 }
3219
3220 if (msg)
3221 r = info->callbacks->warning
3222 (info, msg, name, input_bfd, input_section, rel->r_offset);
3223
3224 if (! r)
3225 return FALSE;
3226 }
3227 }
3228
3229 return TRUE;
3230 }
3231
3232 /* Update the relocation information for the relocations of the section
3233 being removed. */
3234
3235 static bfd_boolean
3236 bfinfdpic_gc_sweep_hook (bfd *abfd,
3237 struct bfd_link_info *info,
3238 asection *sec,
3239 const Elf_Internal_Rela *relocs)
3240 {
3241 Elf_Internal_Shdr *symtab_hdr;
3242 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
3243 const Elf_Internal_Rela *rel;
3244 const Elf_Internal_Rela *rel_end;
3245 struct bfinfdpic_relocs_info *picrel;
3246
3247 BFD_ASSERT (IS_FDPIC (abfd));
3248
3249 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3250 sym_hashes = elf_sym_hashes (abfd);
3251 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
3252 if (!elf_bad_symtab (abfd))
3253 sym_hashes_end -= symtab_hdr->sh_info;
3254
3255 rel_end = relocs + sec->reloc_count;
3256 for (rel = relocs; rel < rel_end; rel++)
3257 {
3258 struct elf_link_hash_entry *h;
3259 unsigned long r_symndx;
3260
3261 r_symndx = ELF32_R_SYM (rel->r_info);
3262 if (r_symndx < symtab_hdr->sh_info)
3263 h = NULL;
3264 else
3265 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3266
3267 if (h != NULL)
3268 picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info),
3269 abfd, h,
3270 rel->r_addend, NO_INSERT);
3271 else
3272 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info
3273 (info), abfd, r_symndx,
3274 rel->r_addend, NO_INSERT);
3275
3276 if (!picrel)
3277 return TRUE;
3278
3279 switch (ELF32_R_TYPE (rel->r_info))
3280 {
3281 case R_BFIN_PCREL24:
3282 case R_BFIN_PCREL24_JUMP_L:
3283 picrel->call--;
3284 break;
3285
3286 case R_BFIN_FUNCDESC_VALUE:
3287 picrel->relocsfdv--;
3288 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
3289 picrel->relocs32++;
3290 /* Fall through. */
3291
3292 case R_BFIN_BYTE4_DATA:
3293 picrel->sym--;
3294 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
3295 picrel->relocs32--;
3296 break;
3297
3298 case R_BFIN_GOT17M4:
3299 picrel->got17m4--;
3300 break;
3301
3302 case R_BFIN_GOTHI:
3303 case R_BFIN_GOTLO:
3304 picrel->gothilo--;
3305 break;
3306
3307 case R_BFIN_FUNCDESC_GOT17M4:
3308 picrel->fdgot17m4--;
3309 break;
3310
3311 case R_BFIN_FUNCDESC_GOTHI:
3312 case R_BFIN_FUNCDESC_GOTLO:
3313 picrel->fdgothilo--;
3314 break;
3315
3316 case R_BFIN_GOTOFF17M4:
3317 case R_BFIN_GOTOFFHI:
3318 case R_BFIN_GOTOFFLO:
3319 picrel->gotoff--;
3320 break;
3321
3322 case R_BFIN_FUNCDESC_GOTOFF17M4:
3323 picrel->fdgoff17m4--;
3324 break;
3325
3326 case R_BFIN_FUNCDESC_GOTOFFHI:
3327 case R_BFIN_FUNCDESC_GOTOFFLO:
3328 picrel->fdgoffhilo--;
3329 break;
3330
3331 case R_BFIN_FUNCDESC:
3332 picrel->fd--;
3333 picrel->relocsfd--;
3334 break;
3335
3336 default:
3337 break;
3338 }
3339 }
3340
3341 return TRUE;
3342 }
3343
3344 /* We need dynamic symbols for every section, since segments can
3345 relocate independently. */
3346 static bfd_boolean
3347 _bfinfdpic_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
3348 struct bfd_link_info *info ATTRIBUTE_UNUSED,
3349 asection *p)
3350 {
3351 switch (elf_section_data (p)->this_hdr.sh_type)
3352 {
3353 case SHT_PROGBITS:
3354 case SHT_NOBITS:
3355 /* If sh_type is yet undecided, assume it could be
3356 SHT_PROGBITS/SHT_NOBITS. */
3357 case SHT_NULL:
3358 return FALSE;
3359
3360 /* There shouldn't be section relative relocations
3361 against any other section. */
3362 default:
3363 return TRUE;
3364 }
3365 }
3366
3367 /* Create a .got section, as well as its additional info field. This
3368 is almost entirely copied from
3369 elflink.c:_bfd_elf_create_got_section(). */
3370
3371 static bfd_boolean
3372 _bfin_create_got_section (bfd *abfd, struct bfd_link_info *info)
3373 {
3374 flagword flags, pltflags;
3375 asection *s;
3376 struct elf_link_hash_entry *h;
3377 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3378 int ptralign;
3379 int offset;
3380
3381 /* This function may be called more than once. */
3382 s = bfd_get_section_by_name (abfd, ".got");
3383 if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0)
3384 return TRUE;
3385
3386 /* Machine specific: although pointers are 32-bits wide, we want the
3387 GOT to be aligned to a 64-bit boundary, such that function
3388 descriptors in it can be accessed with 64-bit loads and
3389 stores. */
3390 ptralign = 3;
3391
3392 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
3393 | SEC_LINKER_CREATED);
3394 pltflags = flags;
3395
3396 s = bfd_make_section_with_flags (abfd, ".got", flags);
3397 if (s == NULL
3398 || !bfd_set_section_alignment (abfd, s, ptralign))
3399 return FALSE;
3400
3401 if (bed->want_got_plt)
3402 {
3403 s = bfd_make_section_with_flags (abfd, ".got.plt", flags);
3404 if (s == NULL
3405 || !bfd_set_section_alignment (abfd, s, ptralign))
3406 return FALSE;
3407 }
3408
3409 if (bed->want_got_sym)
3410 {
3411 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
3412 (or .got.plt) section. We don't do this in the linker script
3413 because we don't want to define the symbol if we are not creating
3414 a global offset table. */
3415 h = _bfd_elf_define_linkage_sym (abfd, info, s, "__GLOBAL_OFFSET_TABLE_");
3416 elf_hash_table (info)->hgot = h;
3417 if (h == NULL)
3418 return FALSE;
3419
3420 /* Machine-specific: we want the symbol for executables as
3421 well. */
3422 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3423 return FALSE;
3424 }
3425
3426 /* The first bit of the global offset table is the header. */
3427 s->size += bed->got_header_size;
3428
3429 /* This is the machine-specific part. Create and initialize section
3430 data for the got. */
3431 if (IS_FDPIC (abfd))
3432 {
3433 bfinfdpic_got_section (info) = s;
3434 bfinfdpic_relocs_info (info) = htab_try_create (1,
3435 bfinfdpic_relocs_info_hash,
3436 bfinfdpic_relocs_info_eq,
3437 (htab_del) NULL);
3438 if (! bfinfdpic_relocs_info (info))
3439 return FALSE;
3440
3441 s = bfd_make_section_with_flags (abfd, ".rel.got",
3442 (flags | SEC_READONLY));
3443 if (s == NULL
3444 || ! bfd_set_section_alignment (abfd, s, 2))
3445 return FALSE;
3446
3447 bfinfdpic_gotrel_section (info) = s;
3448
3449 /* Machine-specific. */
3450 s = bfd_make_section_with_flags (abfd, ".rofixup",
3451 (flags | SEC_READONLY));
3452 if (s == NULL
3453 || ! bfd_set_section_alignment (abfd, s, 2))
3454 return FALSE;
3455
3456 bfinfdpic_gotfixup_section (info) = s;
3457 offset = -2048;
3458 flags = BSF_GLOBAL;
3459 }
3460 else
3461 {
3462 offset = 2048;
3463 flags = BSF_GLOBAL | BSF_WEAK;
3464 }
3465
3466 flags = pltflags;
3467 pltflags |= SEC_CODE;
3468 if (bed->plt_not_loaded)
3469 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
3470 if (bed->plt_readonly)
3471 pltflags |= SEC_READONLY;
3472
3473 s = bfd_make_section_with_flags (abfd, ".plt", pltflags);
3474 if (s == NULL
3475 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
3476 return FALSE;
3477 /* Blackfin-specific: remember it. */
3478 bfinfdpic_plt_section (info) = s;
3479
3480 if (bed->want_plt_sym)
3481 {
3482 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
3483 .plt section. */
3484 struct bfd_link_hash_entry *bh = NULL;
3485
3486 if (! (_bfd_generic_link_add_one_symbol
3487 (info, abfd, "__PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, 0, NULL,
3488 FALSE, get_elf_backend_data (abfd)->collect, &bh)))
3489 return FALSE;
3490 h = (struct elf_link_hash_entry *) bh;
3491 h->def_regular = 1;
3492 h->type = STT_OBJECT;
3493
3494 if (! info->executable
3495 && ! bfd_elf_link_record_dynamic_symbol (info, h))
3496 return FALSE;
3497 }
3498
3499 /* Blackfin-specific: we want rel relocations for the plt. */
3500 s = bfd_make_section_with_flags (abfd, ".rel.plt", flags | SEC_READONLY);
3501 if (s == NULL
3502 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
3503 return FALSE;
3504 /* Blackfin-specific: remember it. */
3505 bfinfdpic_pltrel_section (info) = s;
3506
3507 return TRUE;
3508 }
3509
3510 /* Make sure the got and plt sections exist, and that our pointers in
3511 the link hash table point to them. */
3512
3513 static bfd_boolean
3514 elf32_bfinfdpic_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
3515 {
3516 /* This is mostly copied from
3517 elflink.c:_bfd_elf_create_dynamic_sections(). */
3518 flagword flags;
3519 asection *s;
3520 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3521
3522 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
3523 | SEC_LINKER_CREATED);
3524
3525 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
3526 .rel[a].bss sections. */
3527
3528 /* Blackfin-specific: we want to create the GOT in the Blackfin way. */
3529 if (! _bfin_create_got_section (abfd, info))
3530 return FALSE;
3531
3532 /* Blackfin-specific: make sure we created everything we wanted. */
3533 BFD_ASSERT (bfinfdpic_got_section (info) && bfinfdpic_gotrel_section (info)
3534 /* && bfinfdpic_gotfixup_section (info) */
3535 && bfinfdpic_plt_section (info)
3536 && bfinfdpic_pltrel_section (info));
3537
3538 if (bed->want_dynbss)
3539 {
3540 /* The .dynbss section is a place to put symbols which are defined
3541 by dynamic objects, are referenced by regular objects, and are
3542 not functions. We must allocate space for them in the process
3543 image and use a R_*_COPY reloc to tell the dynamic linker to
3544 initialize them at run time. The linker script puts the .dynbss
3545 section into the .bss section of the final image. */
3546 s = bfd_make_section_with_flags (abfd, ".dynbss",
3547 SEC_ALLOC | SEC_LINKER_CREATED);
3548 if (s == NULL)
3549 return FALSE;
3550
3551 /* The .rel[a].bss section holds copy relocs. This section is not
3552 normally needed. We need to create it here, though, so that the
3553 linker will map it to an output section. We can't just create it
3554 only if we need it, because we will not know whether we need it
3555 until we have seen all the input files, and the first time the
3556 main linker code calls BFD after examining all the input files
3557 (size_dynamic_sections) the input sections have already been
3558 mapped to the output sections. If the section turns out not to
3559 be needed, we can discard it later. We will never need this
3560 section when generating a shared object, since they do not use
3561 copy relocs. */
3562 if (! info->shared)
3563 {
3564 s = bfd_make_section_with_flags (abfd,
3565 ".rela.bss",
3566 flags | SEC_READONLY);
3567 if (s == NULL
3568 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
3569 return FALSE;
3570 }
3571 }
3572
3573 return TRUE;
3574 }
3575
3576 /* Compute the total GOT size required by each symbol in each range.
3577 Symbols may require up to 4 words in the GOT: an entry pointing to
3578 the symbol, an entry pointing to its function descriptor, and a
3579 private function descriptors taking two words. */
3580
3581 static void
3582 _bfinfdpic_count_nontls_entries (struct bfinfdpic_relocs_info *entry,
3583 struct _bfinfdpic_dynamic_got_info *dinfo)
3584 {
3585 /* Allocate space for a GOT entry pointing to the symbol. */
3586 if (entry->got17m4)
3587 dinfo->got17m4 += 4;
3588 else if (entry->gothilo)
3589 dinfo->gothilo += 4;
3590 else
3591 entry->relocs32--;
3592 entry->relocs32++;
3593
3594 /* Allocate space for a GOT entry pointing to the function
3595 descriptor. */
3596 if (entry->fdgot17m4)
3597 dinfo->got17m4 += 4;
3598 else if (entry->fdgothilo)
3599 dinfo->gothilo += 4;
3600 else
3601 entry->relocsfd--;
3602 entry->relocsfd++;
3603
3604 /* Decide whether we need a PLT entry, a function descriptor in the
3605 GOT, and a lazy PLT entry for this symbol. */
3606 entry->plt = entry->call
3607 && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h)
3608 && elf_hash_table (dinfo->info)->dynamic_sections_created;
3609 entry->privfd = entry->plt
3610 || entry->fdgoff17m4 || entry->fdgoffhilo
3611 || ((entry->fd || entry->fdgot17m4 || entry->fdgothilo)
3612 && (entry->symndx != -1
3613 || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h)));
3614 entry->lazyplt = entry->privfd
3615 && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h)
3616 && ! (dinfo->info->flags & DF_BIND_NOW)
3617 && elf_hash_table (dinfo->info)->dynamic_sections_created;
3618
3619 /* Allocate space for a function descriptor. */
3620 if (entry->fdgoff17m4)
3621 dinfo->fd17m4 += 8;
3622 else if (entry->privfd && entry->plt)
3623 dinfo->fdplt += 8;
3624 else if (entry->privfd)
3625 dinfo->fdhilo += 8;
3626 else
3627 entry->relocsfdv--;
3628 entry->relocsfdv++;
3629
3630 if (entry->lazyplt)
3631 dinfo->lzplt += LZPLT_NORMAL_SIZE;
3632 }
3633
3634 /* Compute the number of dynamic relocations and fixups that a symbol
3635 requires, and add (or subtract) from the grand and per-symbol
3636 totals. */
3637
3638 static void
3639 _bfinfdpic_count_relocs_fixups (struct bfinfdpic_relocs_info *entry,
3640 struct _bfinfdpic_dynamic_got_info *dinfo,
3641 bfd_boolean subtract)
3642 {
3643 bfd_vma relocs = 0, fixups = 0;
3644
3645 if (!dinfo->info->executable || dinfo->info->pie)
3646 relocs = entry->relocs32 + entry->relocsfd + entry->relocsfdv;
3647 else
3648 {
3649 if (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h))
3650 {
3651 if (entry->symndx != -1
3652 || entry->d.h->root.type != bfd_link_hash_undefweak)
3653 fixups += entry->relocs32 + 2 * entry->relocsfdv;
3654 }
3655 else
3656 relocs += entry->relocs32 + entry->relocsfdv;
3657
3658 if (entry->symndx != -1
3659 || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h))
3660 {
3661 if (entry->symndx != -1
3662 || entry->d.h->root.type != bfd_link_hash_undefweak)
3663 fixups += entry->relocsfd;
3664 }
3665 else
3666 relocs += entry->relocsfd;
3667 }
3668
3669 if (subtract)
3670 {
3671 relocs = - relocs;
3672 fixups = - fixups;
3673 }
3674
3675 entry->dynrelocs += relocs;
3676 entry->fixups += fixups;
3677 dinfo->relocs += relocs;
3678 dinfo->fixups += fixups;
3679 }
3680
3681 /* Compute the total GOT and PLT size required by each symbol in each range. *
3682 Symbols may require up to 4 words in the GOT: an entry pointing to
3683 the symbol, an entry pointing to its function descriptor, and a
3684 private function descriptors taking two words. */
3685
3686 static int
3687 _bfinfdpic_count_got_plt_entries (void **entryp, void *dinfo_)
3688 {
3689 struct bfinfdpic_relocs_info *entry = *entryp;
3690 struct _bfinfdpic_dynamic_got_info *dinfo = dinfo_;
3691
3692 _bfinfdpic_count_nontls_entries (entry, dinfo);
3693
3694 _bfinfdpic_count_relocs_fixups (entry, dinfo, FALSE);
3695
3696 return 1;
3697 }
3698
3699 /* This structure is used to assign offsets to got entries, function
3700 descriptors, plt entries and lazy plt entries. */
3701
3702 struct _bfinfdpic_dynamic_got_plt_info
3703 {
3704 /* Summary information collected with _bfinfdpic_count_got_plt_entries. */
3705 struct _bfinfdpic_dynamic_got_info g;
3706
3707 /* For each addressable range, we record a MAX (positive) and MIN
3708 (negative) value. CUR is used to assign got entries, and it's
3709 incremented from an initial positive value to MAX, then from MIN
3710 to FDCUR (unless FDCUR wraps around first). FDCUR is used to
3711 assign function descriptors, and it's decreased from an initial
3712 non-positive value to MIN, then from MAX down to CUR (unless CUR
3713 wraps around first). All of MIN, MAX, CUR and FDCUR always point
3714 to even words. ODD, if non-zero, indicates an odd word to be
3715 used for the next got entry, otherwise CUR is used and
3716 incremented by a pair of words, wrapping around when it reaches
3717 MAX. FDCUR is decremented (and wrapped) before the next function
3718 descriptor is chosen. FDPLT indicates the number of remaining
3719 slots that can be used for function descriptors used only by PLT
3720 entries. */
3721 struct _bfinfdpic_dynamic_got_alloc_data
3722 {
3723 bfd_signed_vma max, cur, odd, fdcur, min;
3724 bfd_vma fdplt;
3725 } got17m4, gothilo;
3726 };
3727
3728 /* Determine the positive and negative ranges to be used by each
3729 offset range in the GOT. FDCUR and CUR, that must be aligned to a
3730 double-word boundary, are the minimum (negative) and maximum
3731 (positive) GOT offsets already used by previous ranges, except for
3732 an ODD entry that may have been left behind. GOT and FD indicate
3733 the size of GOT entries and function descriptors that must be
3734 placed within the range from -WRAP to WRAP. If there's room left,
3735 up to FDPLT bytes should be reserved for additional function
3736 descriptors. */
3737
3738 inline static bfd_signed_vma
3739 _bfinfdpic_compute_got_alloc_data (struct _bfinfdpic_dynamic_got_alloc_data *gad,
3740 bfd_signed_vma fdcur,
3741 bfd_signed_vma odd,
3742 bfd_signed_vma cur,
3743 bfd_vma got,
3744 bfd_vma fd,
3745 bfd_vma fdplt,
3746 bfd_vma wrap)
3747 {
3748 bfd_signed_vma wrapmin = -wrap;
3749
3750 /* Start at the given initial points. */
3751 gad->fdcur = fdcur;
3752 gad->cur = cur;
3753
3754 /* If we had an incoming odd word and we have any got entries that
3755 are going to use it, consume it, otherwise leave gad->odd at
3756 zero. We might force gad->odd to zero and return the incoming
3757 odd such that it is used by the next range, but then GOT entries
3758 might appear to be out of order and we wouldn't be able to
3759 shorten the GOT by one word if it turns out to end with an
3760 unpaired GOT entry. */
3761 if (odd && got)
3762 {
3763 gad->odd = odd;
3764 got -= 4;
3765 odd = 0;
3766 }
3767 else
3768 gad->odd = 0;
3769
3770 /* If we're left with an unpaired GOT entry, compute its location
3771 such that we can return it. Otherwise, if got doesn't require an
3772 odd number of words here, either odd was already zero in the
3773 block above, or it was set to zero because got was non-zero, or
3774 got was already zero. In the latter case, we want the value of
3775 odd to carry over to the return statement, so we don't want to
3776 reset odd unless the condition below is true. */
3777 if (got & 4)
3778 {
3779 odd = cur + got;
3780 got += 4;
3781 }
3782
3783 /* Compute the tentative boundaries of this range. */
3784 gad->max = cur + got;
3785 gad->min = fdcur - fd;
3786 gad->fdplt = 0;
3787
3788 /* If function descriptors took too much space, wrap some of them
3789 around. */
3790 if (gad->min < wrapmin)
3791 {
3792 gad->max += wrapmin - gad->min;
3793 gad->min = wrapmin;
3794 }
3795 /* If there is space left and we have function descriptors
3796 referenced in PLT entries that could take advantage of shorter
3797 offsets, place them here. */
3798 else if (fdplt && gad->min > wrapmin)
3799 {
3800 bfd_vma fds;
3801 if ((bfd_vma) (gad->min - wrapmin) < fdplt)
3802 fds = gad->min - wrapmin;
3803 else
3804 fds = fdplt;
3805
3806 fdplt -= fds;
3807 gad->min -= fds;
3808 gad->fdplt += fds;
3809 }
3810
3811 /* If GOT entries took too much space, wrap some of them around.
3812 This may well cause gad->min to become lower than wrapmin. This
3813 will cause a relocation overflow later on, so we don't have to
3814 report it here . */
3815 if ((bfd_vma) gad->max > wrap)
3816 {
3817 gad->min -= gad->max - wrap;
3818 gad->max = wrap;
3819 }
3820 /* If there is more space left, try to place some more function
3821 descriptors for PLT entries. */
3822 else if (fdplt && (bfd_vma) gad->max < wrap)
3823 {
3824 bfd_vma fds;
3825 if ((bfd_vma) (wrap - gad->max) < fdplt)
3826 fds = wrap - gad->max;
3827 else
3828 fds = fdplt;
3829
3830 fdplt -= fds;
3831 gad->max += fds;
3832 gad->fdplt += fds;
3833 }
3834
3835 /* If odd was initially computed as an offset past the wrap point,
3836 wrap it around. */
3837 if (odd > gad->max)
3838 odd = gad->min + odd - gad->max;
3839
3840 /* _bfinfdpic_get_got_entry() below will always wrap gad->cur if needed
3841 before returning, so do it here too. This guarantees that,
3842 should cur and fdcur meet at the wrap point, they'll both be
3843 equal to min. */
3844 if (gad->cur == gad->max)
3845 gad->cur = gad->min;
3846
3847 return odd;
3848 }
3849
3850 /* Compute the location of the next GOT entry, given the allocation
3851 data for a range. */
3852
3853 inline static bfd_signed_vma
3854 _bfinfdpic_get_got_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad)
3855 {
3856 bfd_signed_vma ret;
3857
3858 if (gad->odd)
3859 {
3860 /* If there was an odd word left behind, use it. */
3861 ret = gad->odd;
3862 gad->odd = 0;
3863 }
3864 else
3865 {
3866 /* Otherwise, use the word pointed to by cur, reserve the next
3867 as an odd word, and skip to the next pair of words, possibly
3868 wrapping around. */
3869 ret = gad->cur;
3870 gad->odd = gad->cur + 4;
3871 gad->cur += 8;
3872 if (gad->cur == gad->max)
3873 gad->cur = gad->min;
3874 }
3875
3876 return ret;
3877 }
3878
3879 /* Compute the location of the next function descriptor entry in the
3880 GOT, given the allocation data for a range. */
3881
3882 inline static bfd_signed_vma
3883 _bfinfdpic_get_fd_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad)
3884 {
3885 /* If we're at the bottom, wrap around, and only then allocate the
3886 next pair of words. */
3887 if (gad->fdcur == gad->min)
3888 gad->fdcur = gad->max;
3889 return gad->fdcur -= 8;
3890 }
3891
3892 /* Assign GOT offsets for every GOT entry and function descriptor.
3893 Doing everything in a single pass is tricky. */
3894
3895 static int
3896 _bfinfdpic_assign_got_entries (void **entryp, void *info_)
3897 {
3898 struct bfinfdpic_relocs_info *entry = *entryp;
3899 struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_;
3900
3901 if (entry->got17m4)
3902 entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4);
3903 else if (entry->gothilo)
3904 entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo);
3905
3906 if (entry->fdgot17m4)
3907 entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4);
3908 else if (entry->fdgothilo)
3909 entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo);
3910
3911 if (entry->fdgoff17m4)
3912 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4);
3913 else if (entry->plt && dinfo->got17m4.fdplt)
3914 {
3915 dinfo->got17m4.fdplt -= 8;
3916 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4);
3917 }
3918 else if (entry->plt)
3919 {
3920 dinfo->gothilo.fdplt -= 8;
3921 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo);
3922 }
3923 else if (entry->privfd)
3924 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo);
3925
3926 return 1;
3927 }
3928
3929 /* Assign GOT offsets to private function descriptors used by PLT
3930 entries (or referenced by 32-bit offsets), as well as PLT entries
3931 and lazy PLT entries. */
3932
3933 static int
3934 _bfinfdpic_assign_plt_entries (void **entryp, void *info_)
3935 {
3936 struct bfinfdpic_relocs_info *entry = *entryp;
3937 struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_;
3938
3939 /* If this symbol requires a local function descriptor, allocate
3940 one. */
3941 if (entry->privfd && entry->fd_entry == 0)
3942 {
3943 if (dinfo->got17m4.fdplt)
3944 {
3945 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4);
3946 dinfo->got17m4.fdplt -= 8;
3947 }
3948 else
3949 {
3950 BFD_ASSERT (dinfo->gothilo.fdplt);
3951 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo);
3952 dinfo->gothilo.fdplt -= 8;
3953 }
3954 }
3955
3956 if (entry->plt)
3957 {
3958 int size;
3959
3960 /* We use the section's raw size to mark the location of the
3961 next PLT entry. */
3962 entry->plt_entry = bfinfdpic_plt_section (dinfo->g.info)->size;
3963
3964 /* Figure out the length of this PLT entry based on the
3965 addressing mode we need to reach the function descriptor. */
3966 BFD_ASSERT (entry->fd_entry);
3967 if (entry->fd_entry >= -(1 << (18 - 1))
3968 && entry->fd_entry + 4 < (1 << (18 - 1)))
3969 size = 10;
3970 else
3971 size = 16;
3972
3973 bfinfdpic_plt_section (dinfo->g.info)->size += size;
3974 }
3975
3976 if (entry->lazyplt)
3977 {
3978 entry->lzplt_entry = dinfo->g.lzplt;
3979 dinfo->g.lzplt += LZPLT_NORMAL_SIZE;
3980 /* If this entry is the one that gets the resolver stub, account
3981 for the additional instruction. */
3982 if (entry->lzplt_entry % BFINFDPIC_LZPLT_BLOCK_SIZE
3983 == BFINFDPIC_LZPLT_RESOLV_LOC)
3984 dinfo->g.lzplt += LZPLT_RESOLVER_EXTRA;
3985 }
3986
3987 return 1;
3988 }
3989
3990 /* Cancel out any effects of calling _bfinfdpic_assign_got_entries and
3991 _bfinfdpic_assign_plt_entries. */
3992
3993 static int
3994 _bfinfdpic_reset_got_plt_entries (void **entryp, void *ignore ATTRIBUTE_UNUSED)
3995 {
3996 struct bfinfdpic_relocs_info *entry = *entryp;
3997
3998 entry->got_entry = 0;
3999 entry->fdgot_entry = 0;
4000 entry->fd_entry = 0;
4001 entry->plt_entry = (bfd_vma)-1;
4002 entry->lzplt_entry = (bfd_vma)-1;
4003
4004 return 1;
4005 }
4006
4007 /* Follow indirect and warning hash entries so that each got entry
4008 points to the final symbol definition. P must point to a pointer
4009 to the hash table we're traversing. Since this traversal may
4010 modify the hash table, we set this pointer to NULL to indicate
4011 we've made a potentially-destructive change to the hash table, so
4012 the traversal must be restarted. */
4013 static int
4014 _bfinfdpic_resolve_final_relocs_info (void **entryp, void *p)
4015 {
4016 struct bfinfdpic_relocs_info *entry = *entryp;
4017 htab_t *htab = p;
4018
4019 if (entry->symndx == -1)
4020 {
4021 struct elf_link_hash_entry *h = entry->d.h;
4022 struct bfinfdpic_relocs_info *oentry;
4023
4024 while (h->root.type == bfd_link_hash_indirect
4025 || h->root.type == bfd_link_hash_warning)
4026 h = (struct elf_link_hash_entry *)h->root.u.i.link;
4027
4028 if (entry->d.h == h)
4029 return 1;
4030
4031 oentry = bfinfdpic_relocs_info_for_global (*htab, 0, h, entry->addend,
4032 NO_INSERT);
4033
4034 if (oentry)
4035 {
4036 /* Merge the two entries. */
4037 bfinfdpic_pic_merge_early_relocs_info (oentry, entry);
4038 htab_clear_slot (*htab, entryp);
4039 return 1;
4040 }
4041
4042 entry->d.h = h;
4043
4044 /* If we can't find this entry with the new bfd hash, re-insert
4045 it, and get the traversal restarted. */
4046 if (! htab_find (*htab, entry))
4047 {
4048 htab_clear_slot (*htab, entryp);
4049 entryp = htab_find_slot (*htab, entry, INSERT);
4050 if (! *entryp)
4051 *entryp = entry;
4052 /* Abort the traversal, since the whole table may have
4053 moved, and leave it up to the parent to restart the
4054 process. */
4055 *(htab_t *)p = NULL;
4056 return 0;
4057 }
4058 }
4059
4060 return 1;
4061 }
4062
4063 /* Compute the total size of the GOT, the PLT, the dynamic relocations
4064 section and the rofixup section. Assign locations for GOT and PLT
4065 entries. */
4066
4067 static bfd_boolean
4068 _bfinfdpic_size_got_plt (bfd *output_bfd,
4069 struct _bfinfdpic_dynamic_got_plt_info *gpinfop)
4070 {
4071 bfd_signed_vma odd;
4072 bfd_vma limit;
4073 struct bfd_link_info *info = gpinfop->g.info;
4074 bfd *dynobj = elf_hash_table (info)->dynobj;
4075
4076 memcpy (bfinfdpic_dynamic_got_plt_info (info), &gpinfop->g,
4077 sizeof (gpinfop->g));
4078
4079 odd = 12;
4080 /* Compute the total size taken by entries in the 18-bit range,
4081 to tell how many PLT function descriptors we can bring into it
4082 without causing it to overflow. */
4083 limit = odd + gpinfop->g.got17m4 + gpinfop->g.fd17m4;
4084 if (limit < (bfd_vma)1 << 18)
4085 limit = ((bfd_vma)1 << 18) - limit;
4086 else
4087 limit = 0;
4088 if (gpinfop->g.fdplt < limit)
4089 limit = gpinfop->g.fdplt;
4090
4091 /* Determine the ranges of GOT offsets that we can use for each
4092 range of addressing modes. */
4093 odd = _bfinfdpic_compute_got_alloc_data (&gpinfop->got17m4,
4094 0,
4095 odd,
4096 16,
4097 gpinfop->g.got17m4,
4098 gpinfop->g.fd17m4,
4099 limit,
4100 (bfd_vma)1 << (18-1));
4101 odd = _bfinfdpic_compute_got_alloc_data (&gpinfop->gothilo,
4102 gpinfop->got17m4.min,
4103 odd,
4104 gpinfop->got17m4.max,
4105 gpinfop->g.gothilo,
4106 gpinfop->g.fdhilo,
4107 gpinfop->g.fdplt - gpinfop->got17m4.fdplt,
4108 (bfd_vma)1 << (32-1));
4109
4110 /* Now assign (most) GOT offsets. */
4111 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_got_entries,
4112 gpinfop);
4113
4114 bfinfdpic_got_section (info)->size = gpinfop->gothilo.max
4115 - gpinfop->gothilo.min
4116 /* If an odd word is the last word of the GOT, we don't need this
4117 word to be part of the GOT. */
4118 - (odd + 4 == gpinfop->gothilo.max ? 4 : 0);
4119 if (bfinfdpic_got_section (info)->size == 0)
4120 bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE;
4121 else if (bfinfdpic_got_section (info)->size == 12
4122 && ! elf_hash_table (info)->dynamic_sections_created)
4123 {
4124 bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE;
4125 bfinfdpic_got_section (info)->size = 0;
4126 }
4127 else
4128 {
4129 bfinfdpic_got_section (info)->contents =
4130 (bfd_byte *) bfd_zalloc (dynobj,
4131 bfinfdpic_got_section (info)->size);
4132 if (bfinfdpic_got_section (info)->contents == NULL)
4133 return FALSE;
4134 }
4135
4136 if (elf_hash_table (info)->dynamic_sections_created)
4137 /* Subtract the number of lzplt entries, since those will generate
4138 relocations in the pltrel section. */
4139 bfinfdpic_gotrel_section (info)->size =
4140 (gpinfop->g.relocs - gpinfop->g.lzplt / LZPLT_NORMAL_SIZE)
4141 * get_elf_backend_data (output_bfd)->s->sizeof_rel;
4142 else
4143 BFD_ASSERT (gpinfop->g.relocs == 0);
4144 if (bfinfdpic_gotrel_section (info)->size == 0)
4145 bfinfdpic_gotrel_section (info)->flags |= SEC_EXCLUDE;
4146 else
4147 {
4148 bfinfdpic_gotrel_section (info)->contents =
4149 (bfd_byte *) bfd_zalloc (dynobj,
4150 bfinfdpic_gotrel_section (info)->size);
4151 if (bfinfdpic_gotrel_section (info)->contents == NULL)
4152 return FALSE;
4153 }
4154
4155 bfinfdpic_gotfixup_section (info)->size = (gpinfop->g.fixups + 1) * 4;
4156 if (bfinfdpic_gotfixup_section (info)->size == 0)
4157 bfinfdpic_gotfixup_section (info)->flags |= SEC_EXCLUDE;
4158 else
4159 {
4160 bfinfdpic_gotfixup_section (info)->contents =
4161 (bfd_byte *) bfd_zalloc (dynobj,
4162 bfinfdpic_gotfixup_section (info)->size);
4163 if (bfinfdpic_gotfixup_section (info)->contents == NULL)
4164 return FALSE;
4165 }
4166
4167 if (elf_hash_table (info)->dynamic_sections_created)
4168 bfinfdpic_pltrel_section (info)->size =
4169 gpinfop->g.lzplt / LZPLT_NORMAL_SIZE * get_elf_backend_data (output_bfd)->s->sizeof_rel;
4170 if (bfinfdpic_pltrel_section (info)->size == 0)
4171 bfinfdpic_pltrel_section (info)->flags |= SEC_EXCLUDE;
4172 else
4173 {
4174 bfinfdpic_pltrel_section (info)->contents =
4175 (bfd_byte *) bfd_zalloc (dynobj,
4176 bfinfdpic_pltrel_section (info)->size);
4177 if (bfinfdpic_pltrel_section (info)->contents == NULL)
4178 return FALSE;
4179 }
4180
4181 /* Add 4 bytes for every block of at most 65535 lazy PLT entries,
4182 such that there's room for the additional instruction needed to
4183 call the resolver. Since _bfinfdpic_assign_got_entries didn't
4184 account for them, our block size is 4 bytes smaller than the real
4185 block size. */
4186 if (elf_hash_table (info)->dynamic_sections_created)
4187 {
4188 bfinfdpic_plt_section (info)->size = gpinfop->g.lzplt
4189 + ((gpinfop->g.lzplt + (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) - LZPLT_NORMAL_SIZE)
4190 / (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) * LZPLT_RESOLVER_EXTRA);
4191 }
4192
4193 /* Reset it, such that _bfinfdpic_assign_plt_entries() can use it to
4194 actually assign lazy PLT entries addresses. */
4195 gpinfop->g.lzplt = 0;
4196
4197 /* Save information that we're going to need to generate GOT and PLT
4198 entries. */
4199 bfinfdpic_got_initial_offset (info) = -gpinfop->gothilo.min;
4200
4201 if (get_elf_backend_data (output_bfd)->want_got_sym)
4202 elf_hash_table (info)->hgot->root.u.def.value
4203 = bfinfdpic_got_initial_offset (info);
4204
4205 if (elf_hash_table (info)->dynamic_sections_created)
4206 bfinfdpic_plt_initial_offset (info) =
4207 bfinfdpic_plt_section (info)->size;
4208
4209 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_plt_entries,
4210 gpinfop);
4211
4212 /* Allocate the PLT section contents only after
4213 _bfinfdpic_assign_plt_entries has a chance to add the size of the
4214 non-lazy PLT entries. */
4215 if (bfinfdpic_plt_section (info)->size == 0)
4216 bfinfdpic_plt_section (info)->flags |= SEC_EXCLUDE;
4217 else
4218 {
4219 bfinfdpic_plt_section (info)->contents =
4220 (bfd_byte *) bfd_zalloc (dynobj,
4221 bfinfdpic_plt_section (info)->size);
4222 if (bfinfdpic_plt_section (info)->contents == NULL)
4223 return FALSE;
4224 }
4225
4226 return TRUE;
4227 }
4228
4229 /* Set the sizes of the dynamic sections. */
4230
4231 static bfd_boolean
4232 elf32_bfinfdpic_size_dynamic_sections (bfd *output_bfd,
4233 struct bfd_link_info *info)
4234 {
4235 struct elf_link_hash_table *htab;
4236 bfd *dynobj;
4237 asection *s;
4238 struct _bfinfdpic_dynamic_got_plt_info gpinfo;
4239
4240 htab = elf_hash_table (info);
4241 dynobj = htab->dynobj;
4242 BFD_ASSERT (dynobj != NULL);
4243
4244 if (htab->dynamic_sections_created)
4245 {
4246 /* Set the contents of the .interp section to the interpreter. */
4247 if (info->executable)
4248 {
4249 s = bfd_get_section_by_name (dynobj, ".interp");
4250 BFD_ASSERT (s != NULL);
4251 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
4252 s->contents = (bfd_byte *) ELF_DYNAMIC_INTERPRETER;
4253 }
4254 }
4255
4256 memset (&gpinfo, 0, sizeof (gpinfo));
4257 gpinfo.g.info = info;
4258
4259 for (;;)
4260 {
4261 htab_t relocs = bfinfdpic_relocs_info (info);
4262
4263 htab_traverse (relocs, _bfinfdpic_resolve_final_relocs_info, &relocs);
4264
4265 if (relocs == bfinfdpic_relocs_info (info))
4266 break;
4267 }
4268
4269 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_count_got_plt_entries,
4270 &gpinfo.g);
4271
4272 /* Allocate space to save the summary information, we're going to
4273 use it if we're doing relaxations. */
4274 bfinfdpic_dynamic_got_plt_info (info) = bfd_alloc (dynobj, sizeof (gpinfo.g));
4275
4276 if (!_bfinfdpic_size_got_plt (output_bfd, &gpinfo))
4277 return FALSE;
4278
4279 if (elf_hash_table (info)->dynamic_sections_created)
4280 {
4281 if (bfinfdpic_got_section (info)->size)
4282 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0))
4283 return FALSE;
4284
4285 if (bfinfdpic_pltrel_section (info)->size)
4286 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0)
4287 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_REL)
4288 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0))
4289 return FALSE;
4290
4291 if (bfinfdpic_gotrel_section (info)->size)
4292 if (!_bfd_elf_add_dynamic_entry (info, DT_REL, 0)
4293 || !_bfd_elf_add_dynamic_entry (info, DT_RELSZ, 0)
4294 || !_bfd_elf_add_dynamic_entry (info, DT_RELENT,
4295 sizeof (Elf32_External_Rel)))
4296 return FALSE;
4297 }
4298
4299 s = bfd_get_section_by_name (dynobj, ".dynbss");
4300 if (s && s->size == 0)
4301 s->flags |= SEC_EXCLUDE;
4302
4303 s = bfd_get_section_by_name (dynobj, ".rela.bss");
4304 if (s && s->size == 0)
4305 s->flags |= SEC_EXCLUDE;
4306
4307 return TRUE;
4308 }
4309
4310 static bfd_boolean
4311 elf32_bfinfdpic_always_size_sections (bfd *output_bfd,
4312 struct bfd_link_info *info)
4313 {
4314 if (!info->relocatable)
4315 {
4316 struct elf_link_hash_entry *h;
4317
4318 /* Force a PT_GNU_STACK segment to be created. */
4319 if (! elf_tdata (output_bfd)->stack_flags)
4320 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
4321
4322 /* Define __stacksize if it's not defined yet. */
4323 h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize",
4324 FALSE, FALSE, FALSE);
4325 if (! h || h->root.type != bfd_link_hash_defined
4326 || h->type != STT_OBJECT
4327 || !h->def_regular)
4328 {
4329 struct bfd_link_hash_entry *bh = NULL;
4330
4331 if (!(_bfd_generic_link_add_one_symbol
4332 (info, output_bfd, "__stacksize",
4333 BSF_GLOBAL, bfd_abs_section_ptr, DEFAULT_STACK_SIZE,
4334 (const char *) NULL, FALSE,
4335 get_elf_backend_data (output_bfd)->collect, &bh)))
4336 return FALSE;
4337
4338 h = (struct elf_link_hash_entry *) bh;
4339 h->def_regular = 1;
4340 h->type = STT_OBJECT;
4341 }
4342 }
4343
4344 return TRUE;
4345 }
4346
4347 /* Check whether any of the relocations was optimized away, and
4348 subtract it from the relocation or fixup count. */
4349 static bfd_boolean
4350 _bfinfdpic_check_discarded_relocs (bfd *abfd, asection *sec,
4351 struct bfd_link_info *info,
4352
4353 bfd_boolean *changed)
4354 {
4355 Elf_Internal_Shdr *symtab_hdr;
4356 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
4357 Elf_Internal_Rela *rel, *erel;
4358
4359 if ((sec->flags & SEC_RELOC) == 0
4360 || sec->reloc_count == 0)
4361 return TRUE;
4362
4363 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4364 sym_hashes = elf_sym_hashes (abfd);
4365 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
4366 if (!elf_bad_symtab (abfd))
4367 sym_hashes_end -= symtab_hdr->sh_info;
4368
4369 rel = elf_section_data (sec)->relocs;
4370
4371 /* Now examine each relocation. */
4372 for (erel = rel + sec->reloc_count; rel < erel; rel++)
4373 {
4374 struct elf_link_hash_entry *h;
4375 unsigned long r_symndx;
4376 struct bfinfdpic_relocs_info *picrel;
4377 struct _bfinfdpic_dynamic_got_info *dinfo;
4378
4379 if (ELF32_R_TYPE (rel->r_info) != R_BFIN_BYTE4_DATA
4380 && ELF32_R_TYPE (rel->r_info) != R_BFIN_FUNCDESC)
4381 continue;
4382
4383 if (_bfd_elf_section_offset (sec->output_section->owner,
4384 info, sec, rel->r_offset)
4385 != (bfd_vma)-1)
4386 continue;
4387
4388 r_symndx = ELF32_R_SYM (rel->r_info);
4389 if (r_symndx < symtab_hdr->sh_info)
4390 h = NULL;
4391 else
4392 {
4393 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
4394 while (h->root.type == bfd_link_hash_indirect
4395 || h->root.type == bfd_link_hash_warning)
4396 h = (struct elf_link_hash_entry *)h->root.u.i.link;
4397 }
4398
4399 if (h != NULL)
4400 picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info),
4401 abfd, h,
4402 rel->r_addend, NO_INSERT);
4403 else
4404 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info (info),
4405 abfd, r_symndx,
4406 rel->r_addend, NO_INSERT);
4407
4408 if (! picrel)
4409 return FALSE;
4410
4411 *changed = TRUE;
4412 dinfo = bfinfdpic_dynamic_got_plt_info (info);
4413
4414 _bfinfdpic_count_relocs_fixups (picrel, dinfo, TRUE);
4415 if (ELF32_R_TYPE (rel->r_info) == R_BFIN_BYTE4_DATA)
4416 picrel->relocs32--;
4417 else /* we know (ELF32_R_TYPE (rel->r_info) == R_BFIN_FUNCDESC) */
4418 picrel->relocsfd--;
4419 _bfinfdpic_count_relocs_fixups (picrel, dinfo, FALSE);
4420 }
4421
4422 return TRUE;
4423 }
4424
4425 static bfd_boolean
4426 bfinfdpic_elf_discard_info (bfd *ibfd,
4427 struct elf_reloc_cookie *cookie ATTRIBUTE_UNUSED,
4428 struct bfd_link_info *info)
4429 {
4430 bfd_boolean changed = FALSE;
4431 asection *s;
4432 bfd *obfd = NULL;
4433
4434 /* Account for relaxation of .eh_frame section. */
4435 for (s = ibfd->sections; s; s = s->next)
4436 if (s->sec_info_type == ELF_INFO_TYPE_EH_FRAME)
4437 {
4438 if (!_bfinfdpic_check_discarded_relocs (ibfd, s, info, &changed))
4439 return FALSE;
4440 obfd = s->output_section->owner;
4441 }
4442
4443 if (changed)
4444 {
4445 struct _bfinfdpic_dynamic_got_plt_info gpinfo;
4446
4447 memset (&gpinfo, 0, sizeof (gpinfo));
4448 memcpy (&gpinfo.g, bfinfdpic_dynamic_got_plt_info (info),
4449 sizeof (gpinfo.g));
4450
4451 /* Clear GOT and PLT assignments. */
4452 htab_traverse (bfinfdpic_relocs_info (info),
4453 _bfinfdpic_reset_got_plt_entries,
4454 NULL);
4455
4456 if (!_bfinfdpic_size_got_plt (obfd, &gpinfo))
4457 return FALSE;
4458 }
4459
4460 return TRUE;
4461 }
4462
4463 static bfd_boolean
4464 elf32_bfinfdpic_modify_program_headers (bfd *output_bfd,
4465 struct bfd_link_info *info)
4466 {
4467 struct elf_obj_tdata *tdata = elf_tdata (output_bfd);
4468 struct elf_segment_map *m;
4469 Elf_Internal_Phdr *p;
4470
4471 /* objcopy and strip preserve what's already there using
4472 elf32_bfinfdpic_copy_private_bfd_data (). */
4473 if (! info)
4474 return TRUE;
4475
4476 for (p = tdata->phdr, m = tdata->segment_map; m != NULL; m = m->next, p++)
4477 if (m->p_type == PT_GNU_STACK)
4478 break;
4479
4480 if (m)
4481 {
4482 struct elf_link_hash_entry *h;
4483
4484 /* Obtain the pointer to the __stacksize symbol. */
4485 h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize",
4486 FALSE, FALSE, FALSE);
4487 if (h)
4488 {
4489 while (h->root.type == bfd_link_hash_indirect
4490 || h->root.type == bfd_link_hash_warning)
4491 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4492 BFD_ASSERT (h->root.type == bfd_link_hash_defined);
4493 }
4494
4495 /* Set the header p_memsz from the symbol value. We
4496 intentionally ignore the symbol section. */
4497 if (h && h->root.type == bfd_link_hash_defined)
4498 p->p_memsz = h->root.u.def.value;
4499 else
4500 p->p_memsz = DEFAULT_STACK_SIZE;
4501
4502 p->p_align = 8;
4503 }
4504
4505 return TRUE;
4506 }
4507
4508 static bfd_boolean
4509 elf32_bfinfdpic_finish_dynamic_sections (bfd *output_bfd,
4510 struct bfd_link_info *info)
4511 {
4512 bfd *dynobj;
4513 asection *sdyn;
4514
4515 dynobj = elf_hash_table (info)->dynobj;
4516
4517 if (bfinfdpic_got_section (info))
4518 {
4519 BFD_ASSERT (bfinfdpic_gotrel_section (info)->size
4520 == (bfinfdpic_gotrel_section (info)->reloc_count
4521 * sizeof (Elf32_External_Rel)));
4522
4523 if (bfinfdpic_gotfixup_section (info))
4524 {
4525 struct elf_link_hash_entry *hgot = elf_hash_table (info)->hgot;
4526 bfd_vma got_value = hgot->root.u.def.value
4527 + hgot->root.u.def.section->output_section->vma
4528 + hgot->root.u.def.section->output_offset;
4529
4530 _bfinfdpic_add_rofixup (output_bfd, bfinfdpic_gotfixup_section (info),
4531 got_value, 0);
4532
4533 if (bfinfdpic_gotfixup_section (info)->size
4534 != (bfinfdpic_gotfixup_section (info)->reloc_count * 4))
4535 {
4536 (*_bfd_error_handler)
4537 ("LINKER BUG: .rofixup section size mismatch");
4538 return FALSE;
4539 }
4540 }
4541 }
4542 if (elf_hash_table (info)->dynamic_sections_created)
4543 {
4544 BFD_ASSERT (bfinfdpic_pltrel_section (info)->size
4545 == (bfinfdpic_pltrel_section (info)->reloc_count
4546 * sizeof (Elf32_External_Rel)));
4547 }
4548
4549 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4550
4551 if (elf_hash_table (info)->dynamic_sections_created)
4552 {
4553 Elf32_External_Dyn * dyncon;
4554 Elf32_External_Dyn * dynconend;
4555
4556 BFD_ASSERT (sdyn != NULL);
4557
4558 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4559 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4560
4561 for (; dyncon < dynconend; dyncon++)
4562 {
4563 Elf_Internal_Dyn dyn;
4564
4565 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4566
4567 switch (dyn.d_tag)
4568 {
4569 default:
4570 break;
4571
4572 case DT_PLTGOT:
4573 dyn.d_un.d_ptr = bfinfdpic_got_section (info)->output_section->vma
4574 + bfinfdpic_got_section (info)->output_offset
4575 + bfinfdpic_got_initial_offset (info);
4576 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4577 break;
4578
4579 case DT_JMPREL:
4580 dyn.d_un.d_ptr = bfinfdpic_pltrel_section (info)
4581 ->output_section->vma
4582 + bfinfdpic_pltrel_section (info)->output_offset;
4583 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4584 break;
4585
4586 case DT_PLTRELSZ:
4587 dyn.d_un.d_val = bfinfdpic_pltrel_section (info)->size;
4588 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4589 break;
4590 }
4591 }
4592 }
4593
4594 return TRUE;
4595 }
4596
4597 /* Adjust a symbol defined by a dynamic object and referenced by a
4598 regular object. */
4599
4600 static bfd_boolean
4601 elf32_bfinfdpic_adjust_dynamic_symbol
4602 (struct bfd_link_info *info,
4603 struct elf_link_hash_entry *h)
4604 {
4605 bfd * dynobj;
4606
4607 dynobj = elf_hash_table (info)->dynobj;
4608
4609 /* Make sure we know what is going on here. */
4610 BFD_ASSERT (dynobj != NULL
4611 && (h->u.weakdef != NULL
4612 || (h->def_dynamic
4613 && h->ref_regular
4614 && !h->def_regular)));
4615
4616 /* If this is a weak symbol, and there is a real definition, the
4617 processor independent code will have arranged for us to see the
4618 real definition first, and we can just use the same value. */
4619 if (h->u.weakdef != NULL)
4620 {
4621 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
4622 || h->u.weakdef->root.type == bfd_link_hash_defweak);
4623 h->root.u.def.section = h->u.weakdef->root.u.def.section;
4624 h->root.u.def.value = h->u.weakdef->root.u.def.value;
4625 }
4626
4627 return TRUE;
4628 }
4629
4630 /* Perform any actions needed for dynamic symbols. */
4631
4632 static bfd_boolean
4633 elf32_bfinfdpic_finish_dynamic_symbol
4634 (bfd *output_bfd ATTRIBUTE_UNUSED,
4635 struct bfd_link_info *info ATTRIBUTE_UNUSED,
4636 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
4637 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
4638 {
4639 return TRUE;
4640 }
4641
4642 /* Decide whether to attempt to turn absptr or lsda encodings in
4643 shared libraries into pcrel within the given input section. */
4644
4645 static bfd_boolean
4646 bfinfdpic_elf_use_relative_eh_frame
4647 (bfd *input_bfd ATTRIBUTE_UNUSED,
4648 struct bfd_link_info *info ATTRIBUTE_UNUSED,
4649 asection *eh_frame_section ATTRIBUTE_UNUSED)
4650 {
4651 /* We can't use PC-relative encodings in FDPIC binaries, in general. */
4652 return FALSE;
4653 }
4654
4655 /* Adjust the contents of an eh_frame_hdr section before they're output. */
4656
4657 static bfd_byte
4658 bfinfdpic_elf_encode_eh_address (bfd *abfd,
4659 struct bfd_link_info *info,
4660 asection *osec, bfd_vma offset,
4661 asection *loc_sec, bfd_vma loc_offset,
4662 bfd_vma *encoded)
4663 {
4664 struct elf_link_hash_entry *h;
4665
4666 h = elf_hash_table (info)->hgot;
4667 BFD_ASSERT (h && h->root.type == bfd_link_hash_defined);
4668
4669 if (! h || (_bfinfdpic_osec_to_segment (abfd, osec)
4670 == _bfinfdpic_osec_to_segment (abfd, loc_sec->output_section)))
4671 return _bfd_elf_encode_eh_address (abfd, info, osec, offset,
4672 loc_sec, loc_offset, encoded);
4673
4674 BFD_ASSERT (_bfinfdpic_osec_to_segment (abfd, osec)
4675 == (_bfinfdpic_osec_to_segment
4676 (abfd, h->root.u.def.section->output_section)));
4677
4678 *encoded = osec->vma + offset
4679 - (h->root.u.def.value
4680 + h->root.u.def.section->output_section->vma
4681 + h->root.u.def.section->output_offset);
4682
4683 return DW_EH_PE_datarel | DW_EH_PE_sdata4;
4684 }
4685
4686
4687
4688 /* Look through the relocs for a section during the first phase.
4689
4690 Besides handling virtual table relocs for gc, we have to deal with
4691 all sorts of PIC-related relocations. We describe below the
4692 general plan on how to handle such relocations, even though we only
4693 collect information at this point, storing them in hash tables for
4694 perusal of later passes.
4695
4696 32 relocations are propagated to the linker output when creating
4697 position-independent output. LO16 and HI16 relocations are not
4698 supposed to be encountered in this case.
4699
4700 LABEL16 should always be resolvable by the linker, since it's only
4701 used by branches.
4702
4703 LABEL24, on the other hand, is used by calls. If it turns out that
4704 the target of a call is a dynamic symbol, a PLT entry must be
4705 created for it, which triggers the creation of a private function
4706 descriptor and, unless lazy binding is disabled, a lazy PLT entry.
4707
4708 GPREL relocations require the referenced symbol to be in the same
4709 segment as _gp, but this can only be checked later.
4710
4711 All GOT, GOTOFF and FUNCDESC relocations require a .got section to
4712 exist. LABEL24 might as well, since it may require a PLT entry,
4713 that will require a got.
4714
4715 Non-FUNCDESC GOT relocations require a GOT entry to be created
4716 regardless of whether the symbol is dynamic. However, since a
4717 global symbol that turns out to not be exported may have the same
4718 address of a non-dynamic symbol, we don't assign GOT entries at
4719 this point, such that we can share them in this case. A relocation
4720 for the GOT entry always has to be created, be it to offset a
4721 private symbol by the section load address, be it to get the symbol
4722 resolved dynamically.
4723
4724 FUNCDESC GOT relocations require a GOT entry to be created, and
4725 handled as if a FUNCDESC relocation was applied to the GOT entry in
4726 an object file.
4727
4728 FUNCDESC relocations referencing a symbol that turns out to NOT be
4729 dynamic cause a private function descriptor to be created. The
4730 FUNCDESC relocation then decays to a 32 relocation that points at
4731 the private descriptor. If the symbol is dynamic, the FUNCDESC
4732 relocation is propagated to the linker output, such that the
4733 dynamic linker creates the canonical descriptor, pointing to the
4734 dynamically-resolved definition of the function.
4735
4736 Non-FUNCDESC GOTOFF relocations must always refer to non-dynamic
4737 symbols that are assigned to the same segment as the GOT, but we
4738 can only check this later, after we know the complete set of
4739 symbols defined and/or exported.
4740
4741 FUNCDESC GOTOFF relocations require a function descriptor to be
4742 created and, unless lazy binding is disabled or the symbol is not
4743 dynamic, a lazy PLT entry. Since we can't tell at this point
4744 whether a symbol is going to be dynamic, we have to decide later
4745 whether to create a lazy PLT entry or bind the descriptor directly
4746 to the private function.
4747
4748 FUNCDESC_VALUE relocations are not supposed to be present in object
4749 files, but they may very well be simply propagated to the linker
4750 output, since they have no side effect.
4751
4752
4753 A function descriptor always requires a FUNCDESC_VALUE relocation.
4754 Whether it's in .plt.rel or not depends on whether lazy binding is
4755 enabled and on whether the referenced symbol is dynamic.
4756
4757 The existence of a lazy PLT requires the resolverStub lazy PLT
4758 entry to be present.
4759
4760
4761 As for assignment of GOT, PLT and lazy PLT entries, and private
4762 descriptors, we might do them all sequentially, but we can do
4763 better than that. For example, we can place GOT entries and
4764 private function descriptors referenced using 12-bit operands
4765 closer to the PIC register value, such that these relocations don't
4766 overflow. Those that are only referenced with LO16 relocations
4767 could come next, but we may as well place PLT-required function
4768 descriptors in the 12-bit range to make them shorter. Symbols
4769 referenced with LO16/HI16 may come next, but we may place
4770 additional function descriptors in the 16-bit range if we can
4771 reliably tell that we've already placed entries that are ever
4772 referenced with only LO16. PLT entries are therefore generated as
4773 small as possible, while not introducing relocation overflows in
4774 GOT or FUNCDESC_GOTOFF relocations. Lazy PLT entries could be
4775 generated before or after PLT entries, but not intermingled with
4776 them, such that we can have more lazy PLT entries in range for a
4777 branch to the resolverStub. The resolverStub should be emitted at
4778 the most distant location from the first lazy PLT entry such that
4779 it's still in range for a branch, or closer, if there isn't a need
4780 for so many lazy PLT entries. Additional lazy PLT entries may be
4781 emitted after the resolverStub, as long as branches are still in
4782 range. If the branch goes out of range, longer lazy PLT entries
4783 are emitted.
4784
4785 We could further optimize PLT and lazy PLT entries by giving them
4786 priority in assignment to closer-to-gr17 locations depending on the
4787 number of occurrences of references to them (assuming a function
4788 that's called more often is more important for performance, so its
4789 PLT entry should be faster), or taking hints from the compiler.
4790 Given infinite time and money... :-) */
4791
4792 static bfd_boolean
4793 bfinfdpic_check_relocs (bfd *abfd, struct bfd_link_info *info,
4794 asection *sec, const Elf_Internal_Rela *relocs)
4795 {
4796 Elf_Internal_Shdr *symtab_hdr;
4797 struct elf_link_hash_entry **sym_hashes;
4798 const Elf_Internal_Rela *rel;
4799 const Elf_Internal_Rela *rel_end;
4800 bfd *dynobj;
4801 struct bfinfdpic_relocs_info *picrel;
4802
4803 if (info->relocatable)
4804 return TRUE;
4805
4806 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4807 sym_hashes = elf_sym_hashes (abfd);
4808
4809 dynobj = elf_hash_table (info)->dynobj;
4810 rel_end = relocs + sec->reloc_count;
4811 for (rel = relocs; rel < rel_end; rel++)
4812 {
4813 struct elf_link_hash_entry *h;
4814 unsigned long r_symndx;
4815
4816 r_symndx = ELF32_R_SYM (rel->r_info);
4817 if (r_symndx < symtab_hdr->sh_info)
4818 h = NULL;
4819 else
4820 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
4821
4822 switch (ELF32_R_TYPE (rel->r_info))
4823 {
4824 case R_BFIN_GOT17M4:
4825 case R_BFIN_GOTHI:
4826 case R_BFIN_GOTLO:
4827 case R_BFIN_FUNCDESC_GOT17M4:
4828 case R_BFIN_FUNCDESC_GOTHI:
4829 case R_BFIN_FUNCDESC_GOTLO:
4830 case R_BFIN_GOTOFF17M4:
4831 case R_BFIN_GOTOFFHI:
4832 case R_BFIN_GOTOFFLO:
4833 case R_BFIN_FUNCDESC_GOTOFF17M4:
4834 case R_BFIN_FUNCDESC_GOTOFFHI:
4835 case R_BFIN_FUNCDESC_GOTOFFLO:
4836 case R_BFIN_FUNCDESC:
4837 case R_BFIN_FUNCDESC_VALUE:
4838 if (! IS_FDPIC (abfd))
4839 goto bad_reloc;
4840 /* Fall through. */
4841 case R_BFIN_PCREL24:
4842 case R_BFIN_PCREL24_JUMP_L:
4843 case R_BFIN_BYTE4_DATA:
4844 if (IS_FDPIC (abfd) && ! dynobj)
4845 {
4846 elf_hash_table (info)->dynobj = dynobj = abfd;
4847 if (! _bfin_create_got_section (abfd, info))
4848 return FALSE;
4849 }
4850 if (! IS_FDPIC (abfd))
4851 {
4852 picrel = NULL;
4853 break;
4854 }
4855 if (h != NULL)
4856 {
4857 if (h->dynindx == -1)
4858 switch (ELF_ST_VISIBILITY (h->other))
4859 {
4860 case STV_INTERNAL:
4861 case STV_HIDDEN:
4862 break;
4863 default:
4864 bfd_elf_link_record_dynamic_symbol (info, h);
4865 break;
4866 }
4867 picrel
4868 = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info),
4869 abfd, h,
4870 rel->r_addend, INSERT);
4871 }
4872 else
4873 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info
4874 (info), abfd, r_symndx,
4875 rel->r_addend, INSERT);
4876 if (! picrel)
4877 return FALSE;
4878 break;
4879
4880 default:
4881 picrel = NULL;
4882 break;
4883 }
4884
4885 switch (ELF32_R_TYPE (rel->r_info))
4886 {
4887 case R_BFIN_PCREL24:
4888 case R_BFIN_PCREL24_JUMP_L:
4889 if (IS_FDPIC (abfd))
4890 picrel->call++;
4891 break;
4892
4893 case R_BFIN_FUNCDESC_VALUE:
4894 picrel->relocsfdv++;
4895 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
4896 picrel->relocs32--;
4897 /* Fall through. */
4898
4899 case R_BFIN_BYTE4_DATA:
4900 if (! IS_FDPIC (abfd))
4901 break;
4902
4903 picrel->sym++;
4904 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
4905 picrel->relocs32++;
4906 break;
4907
4908 case R_BFIN_GOT17M4:
4909 picrel->got17m4++;
4910 break;
4911
4912 case R_BFIN_GOTHI:
4913 case R_BFIN_GOTLO:
4914 picrel->gothilo++;
4915 break;
4916
4917 case R_BFIN_FUNCDESC_GOT17M4:
4918 picrel->fdgot17m4++;
4919 break;
4920
4921 case R_BFIN_FUNCDESC_GOTHI:
4922 case R_BFIN_FUNCDESC_GOTLO:
4923 picrel->fdgothilo++;
4924 break;
4925
4926 case R_BFIN_GOTOFF17M4:
4927 case R_BFIN_GOTOFFHI:
4928 case R_BFIN_GOTOFFLO:
4929 picrel->gotoff++;
4930 break;
4931
4932 case R_BFIN_FUNCDESC_GOTOFF17M4:
4933 picrel->fdgoff17m4++;
4934 break;
4935
4936 case R_BFIN_FUNCDESC_GOTOFFHI:
4937 case R_BFIN_FUNCDESC_GOTOFFLO:
4938 picrel->fdgoffhilo++;
4939 break;
4940
4941 case R_BFIN_FUNCDESC:
4942 picrel->fd++;
4943 picrel->relocsfd++;
4944 break;
4945
4946 /* This relocation describes the C++ object vtable hierarchy.
4947 Reconstruct it for later use during GC. */
4948 case R_BFIN_GNU_VTINHERIT:
4949 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
4950 return FALSE;
4951 break;
4952
4953 /* This relocation describes which C++ vtable entries are actually
4954 used. Record for later use during GC. */
4955 case R_BFIN_GNU_VTENTRY:
4956 BFD_ASSERT (h != NULL);
4957 if (h != NULL
4958 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
4959 return FALSE;
4960 break;
4961
4962 case R_BFIN_HUIMM16:
4963 case R_BFIN_LUIMM16:
4964 case R_BFIN_PCREL12_JUMP_S:
4965 case R_BFIN_PCREL10:
4966 break;
4967
4968 default:
4969 bad_reloc:
4970 (*_bfd_error_handler)
4971 (_("%B: unsupported relocation type %i"),
4972 abfd, ELF32_R_TYPE (rel->r_info));
4973 return FALSE;
4974 }
4975 }
4976
4977 return TRUE;
4978 }
4979
4980 /* Set the right machine number for a Blackfin ELF file. */
4981
4982 static bfd_boolean
4983 elf32_bfin_object_p (bfd *abfd)
4984 {
4985 bfd_default_set_arch_mach (abfd, bfd_arch_bfin, 0);
4986 return (((elf_elfheader (abfd)->e_flags & EF_BFIN_FDPIC) != 0)
4987 == (IS_FDPIC (abfd)));
4988 }
4989
4990 static bfd_boolean
4991 elf32_bfin_set_private_flags (bfd * abfd, flagword flags)
4992 {
4993 elf_elfheader (abfd)->e_flags = flags;
4994 elf_flags_init (abfd) = TRUE;
4995 return TRUE;
4996 }
4997
4998 /* Copy backend specific data from one object module to another. */
4999
5000 static bfd_boolean
5001 bfin_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
5002 {
5003 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
5004 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
5005 return TRUE;
5006
5007 BFD_ASSERT (!elf_flags_init (obfd)
5008 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
5009
5010 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
5011 elf_flags_init (obfd) = TRUE;
5012
5013 /* Copy object attributes. */
5014 _bfd_elf_copy_obj_attributes (ibfd, obfd);
5015
5016 return TRUE;
5017 }
5018
5019 static bfd_boolean
5020 elf32_bfinfdpic_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
5021 {
5022 unsigned i;
5023
5024 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
5025 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
5026 return TRUE;
5027
5028 if (! bfin_elf_copy_private_bfd_data (ibfd, obfd))
5029 return FALSE;
5030
5031 if (! elf_tdata (ibfd) || ! elf_tdata (ibfd)->phdr
5032 || ! elf_tdata (obfd) || ! elf_tdata (obfd)->phdr)
5033 return TRUE;
5034
5035 /* Copy the stack size. */
5036 for (i = 0; i < elf_elfheader (ibfd)->e_phnum; i++)
5037 if (elf_tdata (ibfd)->phdr[i].p_type == PT_GNU_STACK)
5038 {
5039 Elf_Internal_Phdr *iphdr = &elf_tdata (ibfd)->phdr[i];
5040
5041 for (i = 0; i < elf_elfheader (obfd)->e_phnum; i++)
5042 if (elf_tdata (obfd)->phdr[i].p_type == PT_GNU_STACK)
5043 {
5044 memcpy (&elf_tdata (obfd)->phdr[i], iphdr, sizeof (*iphdr));
5045
5046 /* Rewrite the phdrs, since we're only called after they
5047 were first written. */
5048 if (bfd_seek (obfd, (bfd_signed_vma) get_elf_backend_data (obfd)
5049 ->s->sizeof_ehdr, SEEK_SET) != 0
5050 || get_elf_backend_data (obfd)->s
5051 ->write_out_phdrs (obfd, elf_tdata (obfd)->phdr,
5052 elf_elfheader (obfd)->e_phnum) != 0)
5053 return FALSE;
5054 break;
5055 }
5056
5057 break;
5058 }
5059
5060 return TRUE;
5061 }
5062
5063
5064 /* Display the flags field. */
5065 static bfd_boolean
5066 elf32_bfin_print_private_bfd_data (bfd * abfd, PTR ptr)
5067 {
5068 FILE *file = (FILE *) ptr;
5069 flagword flags;
5070
5071 BFD_ASSERT (abfd != NULL && ptr != NULL);
5072
5073 /* Print normal ELF private data. */
5074 _bfd_elf_print_private_bfd_data (abfd, ptr);
5075
5076 flags = elf_elfheader (abfd)->e_flags;
5077
5078 /* xgettext:c-format */
5079 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
5080
5081 if (flags & EF_BFIN_PIC)
5082 fprintf (file, " -fpic");
5083
5084 if (flags & EF_BFIN_FDPIC)
5085 fprintf (file, " -mfdpic");
5086
5087 fputc ('\n', file);
5088
5089 return TRUE;
5090 }
5091
5092 /* Merge backend specific data from an object file to the output
5093 object file when linking. */
5094
5095 static bfd_boolean
5096 elf32_bfin_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
5097 {
5098 flagword old_flags, new_flags;
5099 bfd_boolean error = FALSE;
5100
5101 new_flags = elf_elfheader (ibfd)->e_flags;
5102 old_flags = elf_elfheader (obfd)->e_flags;
5103
5104 if (new_flags & EF_BFIN_FDPIC)
5105 new_flags &= ~EF_BFIN_PIC;
5106
5107 #ifdef DEBUG
5108 (*_bfd_error_handler) ("old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s, filename = %s",
5109 old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no",
5110 bfd_get_filename (ibfd));
5111 #endif
5112
5113 if (!elf_flags_init (obfd)) /* First call, no flags set. */
5114 {
5115 elf_flags_init (obfd) = TRUE;
5116 elf_elfheader (obfd)->e_flags = new_flags;
5117 }
5118
5119 if (((new_flags & EF_BFIN_FDPIC) == 0) != (! IS_FDPIC (obfd)))
5120 {
5121 error = TRUE;
5122 if (IS_FDPIC (obfd))
5123 (*_bfd_error_handler)
5124 (_("%s: cannot link non-fdpic object file into fdpic executable"),
5125 bfd_get_filename (ibfd));
5126 else
5127 (*_bfd_error_handler)
5128 (_("%s: cannot link fdpic object file into non-fdpic executable"),
5129 bfd_get_filename (ibfd));
5130 }
5131
5132 if (error)
5133 bfd_set_error (bfd_error_bad_value);
5134
5135 return !error;
5136 }
5137 \f
5138 /* bfin ELF linker hash entry. */
5139
5140 struct bfin_link_hash_entry
5141 {
5142 struct elf_link_hash_entry root;
5143
5144 /* Number of PC relative relocs copied for this symbol. */
5145 struct bfin_pcrel_relocs_copied *pcrel_relocs_copied;
5146 };
5147
5148 /* bfin ELF linker hash table. */
5149
5150 struct bfin_link_hash_table
5151 {
5152 struct elf_link_hash_table root;
5153
5154 /* Small local sym cache. */
5155 struct sym_cache sym_cache;
5156 };
5157
5158 #define bfin_hash_entry(ent) ((struct bfin_link_hash_entry *) (ent))
5159
5160 static struct bfd_hash_entry *
5161 bfin_link_hash_newfunc (struct bfd_hash_entry *entry,
5162 struct bfd_hash_table *table, const char *string)
5163 {
5164 struct bfd_hash_entry *ret = entry;
5165
5166 /* Allocate the structure if it has not already been allocated by a
5167 subclass. */
5168 if (ret == NULL)
5169 ret = bfd_hash_allocate (table, sizeof (struct bfin_link_hash_entry));
5170 if (ret == NULL)
5171 return ret;
5172
5173 /* Call the allocation method of the superclass. */
5174 ret = _bfd_elf_link_hash_newfunc (ret, table, string);
5175 if (ret != NULL)
5176 bfin_hash_entry (ret)->pcrel_relocs_copied = NULL;
5177
5178 return ret;
5179 }
5180
5181 /* Create an bfin ELF linker hash table. */
5182
5183 static struct bfd_link_hash_table *
5184 bfin_link_hash_table_create (bfd * abfd)
5185 {
5186 struct bfin_link_hash_table *ret;
5187 bfd_size_type amt = sizeof (struct bfin_link_hash_table);
5188
5189 ret = bfd_zalloc (abfd, amt);
5190 if (ret == NULL)
5191 return NULL;
5192
5193 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
5194 bfin_link_hash_newfunc,
5195 sizeof (struct elf_link_hash_entry)))
5196 {
5197 free (ret);
5198 return NULL;
5199 }
5200
5201 ret->sym_cache.abfd = NULL;
5202
5203 return &ret->root.root;
5204 }
5205
5206 /* The size in bytes of an entry in the procedure linkage table. */
5207
5208 /* Finish up the dynamic sections. */
5209
5210 static bfd_boolean
5211 bfin_finish_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED,
5212 struct bfd_link_info *info)
5213 {
5214 bfd *dynobj;
5215 asection *sdyn;
5216
5217 dynobj = elf_hash_table (info)->dynobj;
5218
5219 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
5220
5221 if (elf_hash_table (info)->dynamic_sections_created)
5222 {
5223 Elf32_External_Dyn *dyncon, *dynconend;
5224
5225 BFD_ASSERT (sdyn != NULL);
5226
5227 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5228 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5229 for (; dyncon < dynconend; dyncon++)
5230 {
5231 Elf_Internal_Dyn dyn;
5232
5233 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5234
5235 }
5236
5237 }
5238 return TRUE;
5239 }
5240
5241 /* Finish up dynamic symbol handling. We set the contents of various
5242 dynamic sections here. */
5243
5244 static bfd_boolean
5245 bfin_finish_dynamic_symbol (bfd * output_bfd,
5246 struct bfd_link_info *info,
5247 struct elf_link_hash_entry *h,
5248 Elf_Internal_Sym * sym)
5249 {
5250 bfd *dynobj;
5251
5252 dynobj = elf_hash_table (info)->dynobj;
5253
5254 if (h->got.offset != (bfd_vma) - 1)
5255 {
5256 asection *sgot;
5257 asection *srela;
5258 Elf_Internal_Rela rela;
5259 bfd_byte *loc;
5260
5261 /* This symbol has an entry in the global offset table.
5262 Set it up. */
5263
5264 sgot = bfd_get_section_by_name (dynobj, ".got");
5265 srela = bfd_get_section_by_name (dynobj, ".rela.got");
5266 BFD_ASSERT (sgot != NULL && srela != NULL);
5267
5268 rela.r_offset = (sgot->output_section->vma
5269 + sgot->output_offset
5270 + (h->got.offset & ~(bfd_vma) 1));
5271
5272 /* If this is a -Bsymbolic link, and the symbol is defined
5273 locally, we just want to emit a RELATIVE reloc. Likewise if
5274 the symbol was forced to be local because of a version file.
5275 The entry in the global offset table will already have been
5276 initialized in the relocate_section function. */
5277 if (info->shared
5278 && (info->symbolic
5279 || h->dynindx == -1 || h->forced_local) && h->def_regular)
5280 {
5281 fprintf(stderr, "*** check this relocation %s\n", __FUNCTION__);
5282 rela.r_info = ELF32_R_INFO (0, R_BFIN_PCREL24);
5283 rela.r_addend = bfd_get_signed_32 (output_bfd,
5284 (sgot->contents
5285 +
5286 (h->got.
5287 offset & ~(bfd_vma) 1)));
5288 }
5289 else
5290 {
5291 bfd_put_32 (output_bfd, (bfd_vma) 0,
5292 sgot->contents + (h->got.offset & ~(bfd_vma) 1));
5293 rela.r_info = ELF32_R_INFO (h->dynindx, R_BFIN_GOT);
5294 rela.r_addend = 0;
5295 }
5296
5297 loc = srela->contents;
5298 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
5299 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
5300 }
5301
5302 if (h->needs_copy)
5303 {
5304 BFD_ASSERT (0);
5305 }
5306 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
5307 if (strcmp (h->root.root.string, "__DYNAMIC") == 0
5308 || h == elf_hash_table (info)->hgot)
5309 sym->st_shndx = SHN_ABS;
5310
5311 return TRUE;
5312 }
5313
5314 /* Adjust a symbol defined by a dynamic object and referenced by a
5315 regular object. The current definition is in some section of the
5316 dynamic object, but we're not including those sections. We have to
5317 change the definition to something the rest of the link can
5318 understand. */
5319
5320 static bfd_boolean
5321 bfin_adjust_dynamic_symbol (struct bfd_link_info *info,
5322 struct elf_link_hash_entry *h)
5323 {
5324 bfd *dynobj;
5325 asection *s;
5326 unsigned int power_of_two;
5327
5328 dynobj = elf_hash_table (info)->dynobj;
5329
5330 /* Make sure we know what is going on here. */
5331 BFD_ASSERT (dynobj != NULL
5332 && (h->needs_plt
5333 || h->u.weakdef != NULL
5334 || (h->def_dynamic && h->ref_regular && !h->def_regular)));
5335
5336 /* If this is a function, put it in the procedure linkage table. We
5337 will fill in the contents of the procedure linkage table later,
5338 when we know the address of the .got section. */
5339 if (h->type == STT_FUNC || h->needs_plt)
5340 {
5341 BFD_ASSERT(0);
5342 }
5343
5344 /* If this is a weak symbol, and there is a real definition, the
5345 processor independent code will have arranged for us to see the
5346 real definition first, and we can just use the same value. */
5347 if (h->u.weakdef != NULL)
5348 {
5349 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
5350 || h->u.weakdef->root.type == bfd_link_hash_defweak);
5351 h->root.u.def.section = h->u.weakdef->root.u.def.section;
5352 h->root.u.def.value = h->u.weakdef->root.u.def.value;
5353 return TRUE;
5354 }
5355
5356 /* This is a reference to a symbol defined by a dynamic object which
5357 is not a function. */
5358
5359 /* If we are creating a shared library, we must presume that the
5360 only references to the symbol are via the global offset table.
5361 For such cases we need not do anything here; the relocations will
5362 be handled correctly by relocate_section. */
5363 if (info->shared)
5364 return TRUE;
5365
5366 /* We must allocate the symbol in our .dynbss section, which will
5367 become part of the .bss section of the executable. There will be
5368 an entry for this symbol in the .dynsym section. The dynamic
5369 object will contain position independent code, so all references
5370 from the dynamic object to this symbol will go through the global
5371 offset table. The dynamic linker will use the .dynsym entry to
5372 determine the address it must put in the global offset table, so
5373 both the dynamic object and the regular object will refer to the
5374 same memory location for the variable. */
5375
5376 s = bfd_get_section_by_name (dynobj, ".dynbss");
5377 BFD_ASSERT (s != NULL);
5378
5379 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
5380 copy the initial value out of the dynamic object and into the
5381 runtime process image. We need to remember the offset into the
5382 .rela.bss section we are going to use. */
5383 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
5384 {
5385 asection *srel;
5386
5387 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
5388 BFD_ASSERT (srel != NULL);
5389 srel->size += sizeof (Elf32_External_Rela);
5390 h->needs_copy = 1;
5391 }
5392
5393 /* We need to figure out the alignment required for this symbol. I
5394 have no idea how ELF linkers handle this. */
5395 power_of_two = bfd_log2 (h->size);
5396 if (power_of_two > 3)
5397 power_of_two = 3;
5398
5399 /* Apply the required alignment. */
5400 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
5401 if (power_of_two > bfd_get_section_alignment (dynobj, s))
5402 {
5403 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
5404 return FALSE;
5405 }
5406
5407 /* Define the symbol as being at this point in the section. */
5408 h->root.u.def.section = s;
5409 h->root.u.def.value = s->size;
5410
5411 /* Increment the section size to make room for the symbol. */
5412 s->size += h->size;
5413
5414 return TRUE;
5415 }
5416
5417 /* The bfin linker needs to keep track of the number of relocs that it
5418 decides to copy in check_relocs for each symbol. This is so that it
5419 can discard PC relative relocs if it doesn't need them when linking
5420 with -Bsymbolic. We store the information in a field extending the
5421 regular ELF linker hash table. */
5422
5423 /* This structure keeps track of the number of PC relative relocs we have
5424 copied for a given symbol. */
5425
5426 struct bfin_pcrel_relocs_copied
5427 {
5428 /* Next section. */
5429 struct bfin_pcrel_relocs_copied *next;
5430 /* A section in dynobj. */
5431 asection *section;
5432 /* Number of relocs copied in this section. */
5433 bfd_size_type count;
5434 };
5435
5436 /* This function is called via elf_link_hash_traverse if we are
5437 creating a shared object. In the -Bsymbolic case it discards the
5438 space allocated to copy PC relative relocs against symbols which
5439 are defined in regular objects. For the normal shared case, it
5440 discards space for pc-relative relocs that have become local due to
5441 symbol visibility changes. We allocated space for them in the
5442 check_relocs routine, but we won't fill them in in the
5443 relocate_section routine.
5444
5445 We also check whether any of the remaining relocations apply
5446 against a readonly section, and set the DF_TEXTREL flag in this
5447 case. */
5448
5449 static bfd_boolean
5450 bfin_discard_copies (struct elf_link_hash_entry *h, PTR inf)
5451 {
5452 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5453 struct bfin_pcrel_relocs_copied *s;
5454
5455 if (h->root.type == bfd_link_hash_warning)
5456 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5457
5458 if (!h->def_regular || (!info->symbolic && !h->forced_local))
5459 {
5460 if ((info->flags & DF_TEXTREL) == 0)
5461 {
5462 /* Look for relocations against read-only sections. */
5463 for (s = bfin_hash_entry (h)->pcrel_relocs_copied;
5464 s != NULL; s = s->next)
5465 if ((s->section->flags & SEC_READONLY) != 0)
5466 {
5467 info->flags |= DF_TEXTREL;
5468 break;
5469 }
5470 }
5471
5472 return TRUE;
5473 }
5474
5475 for (s = bfin_hash_entry (h)->pcrel_relocs_copied;
5476 s != NULL; s = s->next)
5477 s->section->size -= s->count * sizeof (Elf32_External_Rela);
5478
5479 return TRUE;
5480 }
5481
5482 static bfd_boolean
5483 bfin_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED,
5484 struct bfd_link_info *info)
5485 {
5486 bfd *dynobj;
5487 asection *s;
5488 bfd_boolean relocs;
5489
5490 dynobj = elf_hash_table (info)->dynobj;
5491 BFD_ASSERT (dynobj != NULL);
5492
5493 if (elf_hash_table (info)->dynamic_sections_created)
5494 {
5495 /* Set the contents of the .interp section to the interpreter. */
5496 if (info->executable)
5497 {
5498 s = bfd_get_section_by_name (dynobj, ".interp");
5499 BFD_ASSERT (s != NULL);
5500 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
5501 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
5502 }
5503 }
5504 else
5505 {
5506 /* We may have created entries in the .rela.got section.
5507 However, if we are not creating the dynamic sections, we will
5508 not actually use these entries. Reset the size of .rela.got,
5509 which will cause it to get stripped from the output file
5510 below. */
5511 s = bfd_get_section_by_name (dynobj, ".rela.got");
5512 if (s != NULL)
5513 s->size = 0;
5514 }
5515
5516 /* If this is a -Bsymbolic shared link, then we need to discard all
5517 PC relative relocs against symbols defined in a regular object.
5518 For the normal shared case we discard the PC relative relocs
5519 against symbols that have become local due to visibility changes.
5520 We allocated space for them in the check_relocs routine, but we
5521 will not fill them in in the relocate_section routine. */
5522 if (info->shared)
5523 elf_link_hash_traverse (elf_hash_table (info),
5524 bfin_discard_copies, (PTR) info);
5525
5526 /* The check_relocs and adjust_dynamic_symbol entry points have
5527 determined the sizes of the various dynamic sections. Allocate
5528 memory for them. */
5529 relocs = FALSE;
5530 for (s = dynobj->sections; s != NULL; s = s->next)
5531 {
5532 const char *name;
5533 bfd_boolean strip;
5534
5535 if ((s->flags & SEC_LINKER_CREATED) == 0)
5536 continue;
5537
5538 /* It's OK to base decisions on the section name, because none
5539 of the dynobj section names depend upon the input files. */
5540 name = bfd_get_section_name (dynobj, s);
5541
5542 strip = FALSE;
5543
5544 if (CONST_STRNEQ (name, ".rela"))
5545 {
5546 if (s->size == 0)
5547 {
5548 /* If we don't need this section, strip it from the
5549 output file. This is mostly to handle .rela.bss and
5550 .rela.plt. We must create both sections in
5551 create_dynamic_sections, because they must be created
5552 before the linker maps input sections to output
5553 sections. The linker does that before
5554 adjust_dynamic_symbol is called, and it is that
5555 function which decides whether anything needs to go
5556 into these sections. */
5557 strip = TRUE;
5558 }
5559 else
5560 {
5561 relocs = TRUE;
5562
5563 /* We use the reloc_count field as a counter if we need
5564 to copy relocs into the output file. */
5565 s->reloc_count = 0;
5566 }
5567 }
5568 else if (! CONST_STRNEQ (name, ".got"))
5569 {
5570 /* It's not one of our sections, so don't allocate space. */
5571 continue;
5572 }
5573
5574 if (strip)
5575 {
5576 s->flags |= SEC_EXCLUDE;
5577 continue;
5578 }
5579
5580 /* Allocate memory for the section contents. */
5581 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc.
5582 Unused entries should be reclaimed before the section's contents
5583 are written out, but at the moment this does not happen. Thus in
5584 order to prevent writing out garbage, we initialise the section's
5585 contents to zero. */
5586 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
5587 if (s->contents == NULL && s->size != 0)
5588 return FALSE;
5589 }
5590
5591 if (elf_hash_table (info)->dynamic_sections_created)
5592 {
5593 /* Add some entries to the .dynamic section. We fill in the
5594 values later, in bfin_finish_dynamic_sections, but we
5595 must add the entries now so that we get the correct size for
5596 the .dynamic section. The DT_DEBUG entry is filled in by the
5597 dynamic linker and used by the debugger. */
5598 #define add_dynamic_entry(TAG, VAL) \
5599 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5600
5601 if (!info->shared)
5602 {
5603 if (!add_dynamic_entry (DT_DEBUG, 0))
5604 return FALSE;
5605 }
5606
5607
5608 if (relocs)
5609 {
5610 if (!add_dynamic_entry (DT_RELA, 0)
5611 || !add_dynamic_entry (DT_RELASZ, 0)
5612 || !add_dynamic_entry (DT_RELAENT,
5613 sizeof (Elf32_External_Rela)))
5614 return FALSE;
5615 }
5616
5617 if ((info->flags & DF_TEXTREL) != 0)
5618 {
5619 if (!add_dynamic_entry (DT_TEXTREL, 0))
5620 return FALSE;
5621 }
5622 }
5623 #undef add_dynamic_entry
5624
5625 return TRUE;
5626 }
5627 \f
5628 /* Given a .data section and a .emreloc in-memory section, store
5629 relocation information into the .emreloc section which can be
5630 used at runtime to relocate the section. This is called by the
5631 linker when the --embedded-relocs switch is used. This is called
5632 after the add_symbols entry point has been called for all the
5633 objects, and before the final_link entry point is called. */
5634
5635 bfd_boolean bfd_bfin_elf32_create_embedded_relocs
5636 PARAMS ((bfd *, struct bfd_link_info *, asection *, asection *, char **));
5637
5638 bfd_boolean
5639 bfd_bfin_elf32_create_embedded_relocs (
5640 bfd *abfd,
5641 struct bfd_link_info *info,
5642 asection *datasec,
5643 asection *relsec,
5644 char **errmsg)
5645 {
5646 Elf_Internal_Shdr *symtab_hdr;
5647 Elf_Internal_Sym *isymbuf = NULL;
5648 Elf_Internal_Rela *internal_relocs = NULL;
5649 Elf_Internal_Rela *irel, *irelend;
5650 bfd_byte *p;
5651 bfd_size_type amt;
5652
5653 BFD_ASSERT (! info->relocatable);
5654
5655 *errmsg = NULL;
5656
5657 if (datasec->reloc_count == 0)
5658 return TRUE;
5659
5660 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
5661
5662 /* Get a copy of the native relocations. */
5663 internal_relocs = (_bfd_elf_link_read_relocs
5664 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
5665 info->keep_memory));
5666 if (internal_relocs == NULL)
5667 goto error_return;
5668
5669 amt = (bfd_size_type) datasec->reloc_count * 12;
5670 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
5671 if (relsec->contents == NULL)
5672 goto error_return;
5673
5674 p = relsec->contents;
5675
5676 irelend = internal_relocs + datasec->reloc_count;
5677 for (irel = internal_relocs; irel < irelend; irel++, p += 12)
5678 {
5679 asection *targetsec;
5680
5681 /* We are going to write a four byte longword into the runtime
5682 reloc section. The longword will be the address in the data
5683 section which must be relocated. It is followed by the name
5684 of the target section NUL-padded or truncated to 8
5685 characters. */
5686
5687 /* We can only relocate absolute longword relocs at run time. */
5688 if (ELF32_R_TYPE (irel->r_info) != (int) R_BFIN_BYTE4_DATA)
5689 {
5690 *errmsg = _("unsupported reloc type");
5691 bfd_set_error (bfd_error_bad_value);
5692 goto error_return;
5693 }
5694
5695 /* Get the target section referred to by the reloc. */
5696 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
5697 {
5698 /* A local symbol. */
5699 Elf_Internal_Sym *isym;
5700
5701 /* Read this BFD's local symbols if we haven't done so already. */
5702 if (isymbuf == NULL)
5703 {
5704 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
5705 if (isymbuf == NULL)
5706 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
5707 symtab_hdr->sh_info, 0,
5708 NULL, NULL, NULL);
5709 if (isymbuf == NULL)
5710 goto error_return;
5711 }
5712
5713 isym = isymbuf + ELF32_R_SYM (irel->r_info);
5714 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
5715 }
5716 else
5717 {
5718 unsigned long indx;
5719 struct elf_link_hash_entry *h;
5720
5721 /* An external symbol. */
5722 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
5723 h = elf_sym_hashes (abfd)[indx];
5724 BFD_ASSERT (h != NULL);
5725 if (h->root.type == bfd_link_hash_defined
5726 || h->root.type == bfd_link_hash_defweak)
5727 targetsec = h->root.u.def.section;
5728 else
5729 targetsec = NULL;
5730 }
5731
5732 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
5733 memset (p + 4, 0, 8);
5734 if (targetsec != NULL)
5735 strncpy ((char *) p + 4, targetsec->output_section->name, 8);
5736 }
5737
5738 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
5739 free (isymbuf);
5740 if (internal_relocs != NULL
5741 && elf_section_data (datasec)->relocs != internal_relocs)
5742 free (internal_relocs);
5743 return TRUE;
5744
5745 error_return:
5746 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
5747 free (isymbuf);
5748 if (internal_relocs != NULL
5749 && elf_section_data (datasec)->relocs != internal_relocs)
5750 free (internal_relocs);
5751 return FALSE;
5752 }
5753
5754 struct bfd_elf_special_section const elf32_bfin_special_sections[] =
5755 {
5756 { ".l1.text", 8, -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
5757 { ".l1.data", 8, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
5758 { NULL, 0, 0, 0, 0 }
5759 };
5760
5761 \f
5762 #define TARGET_LITTLE_SYM bfd_elf32_bfin_vec
5763 #define TARGET_LITTLE_NAME "elf32-bfin"
5764 #define ELF_ARCH bfd_arch_bfin
5765 #define ELF_MACHINE_CODE EM_BLACKFIN
5766 #define ELF_MAXPAGESIZE 0x1000
5767 #define elf_symbol_leading_char '_'
5768
5769 #define bfd_elf32_bfd_reloc_type_lookup bfin_bfd_reloc_type_lookup
5770 #define bfd_elf32_bfd_reloc_name_lookup \
5771 bfin_bfd_reloc_name_lookup
5772 #define elf_info_to_howto bfin_info_to_howto
5773 #define elf_info_to_howto_rel 0
5774 #define elf_backend_object_p elf32_bfin_object_p
5775
5776 #define bfd_elf32_bfd_is_local_label_name \
5777 bfin_is_local_label_name
5778 #define bfin_hash_table(p) \
5779 ((struct bfin_link_hash_table *) (p)->hash)
5780
5781
5782
5783 #define elf_backend_create_dynamic_sections \
5784 _bfd_elf_create_dynamic_sections
5785 #define bfd_elf32_bfd_link_hash_table_create \
5786 bfin_link_hash_table_create
5787 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
5788
5789 #define elf_backend_check_relocs bfin_check_relocs
5790 #define elf_backend_adjust_dynamic_symbol \
5791 bfin_adjust_dynamic_symbol
5792 #define elf_backend_size_dynamic_sections \
5793 bfin_size_dynamic_sections
5794 #define elf_backend_relocate_section bfin_relocate_section
5795 #define elf_backend_finish_dynamic_symbol \
5796 bfin_finish_dynamic_symbol
5797 #define elf_backend_finish_dynamic_sections \
5798 bfin_finish_dynamic_sections
5799 #define elf_backend_gc_mark_hook bfin_gc_mark_hook
5800 #define elf_backend_gc_sweep_hook bfin_gc_sweep_hook
5801 #define bfd_elf32_bfd_merge_private_bfd_data \
5802 elf32_bfin_merge_private_bfd_data
5803 #define bfd_elf32_bfd_set_private_flags \
5804 elf32_bfin_set_private_flags
5805 #define bfd_elf32_bfd_print_private_bfd_data \
5806 elf32_bfin_print_private_bfd_data
5807 #define elf_backend_reloc_type_class elf32_bfin_reloc_type_class
5808 #define elf_backend_can_gc_sections 1
5809 #define elf_backend_special_sections elf32_bfin_special_sections
5810 #define elf_backend_can_refcount 1
5811 #define elf_backend_want_got_plt 0
5812 #define elf_backend_plt_readonly 1
5813 #define elf_backend_want_plt_sym 0
5814 #define elf_backend_got_header_size 12
5815 #define elf_backend_rela_normal 1
5816
5817 #include "elf32-target.h"
5818
5819 #undef TARGET_LITTLE_SYM
5820 #define TARGET_LITTLE_SYM bfd_elf32_bfinfdpic_vec
5821 #undef TARGET_LITTLE_NAME
5822 #define TARGET_LITTLE_NAME "elf32-bfinfdpic"
5823 #undef elf32_bed
5824 #define elf32_bed elf32_bfinfdpic_bed
5825
5826 #undef elf_backend_gc_sweep_hook
5827 #define elf_backend_gc_sweep_hook bfinfdpic_gc_sweep_hook
5828
5829 #undef elf_backend_got_header_size
5830 #define elf_backend_got_header_size 0
5831
5832 #undef elf_backend_relocate_section
5833 #define elf_backend_relocate_section bfinfdpic_relocate_section
5834 #undef elf_backend_check_relocs
5835 #define elf_backend_check_relocs bfinfdpic_check_relocs
5836
5837 #undef bfd_elf32_bfd_link_hash_table_create
5838 #define bfd_elf32_bfd_link_hash_table_create \
5839 bfinfdpic_elf_link_hash_table_create
5840 #undef elf_backend_always_size_sections
5841 #define elf_backend_always_size_sections \
5842 elf32_bfinfdpic_always_size_sections
5843 #undef elf_backend_modify_program_headers
5844 #define elf_backend_modify_program_headers \
5845 elf32_bfinfdpic_modify_program_headers
5846 #undef bfd_elf32_bfd_copy_private_bfd_data
5847 #define bfd_elf32_bfd_copy_private_bfd_data \
5848 elf32_bfinfdpic_copy_private_bfd_data
5849
5850 #undef elf_backend_create_dynamic_sections
5851 #define elf_backend_create_dynamic_sections \
5852 elf32_bfinfdpic_create_dynamic_sections
5853 #undef elf_backend_adjust_dynamic_symbol
5854 #define elf_backend_adjust_dynamic_symbol \
5855 elf32_bfinfdpic_adjust_dynamic_symbol
5856 #undef elf_backend_size_dynamic_sections
5857 #define elf_backend_size_dynamic_sections \
5858 elf32_bfinfdpic_size_dynamic_sections
5859 #undef elf_backend_finish_dynamic_symbol
5860 #define elf_backend_finish_dynamic_symbol \
5861 elf32_bfinfdpic_finish_dynamic_symbol
5862 #undef elf_backend_finish_dynamic_sections
5863 #define elf_backend_finish_dynamic_sections \
5864 elf32_bfinfdpic_finish_dynamic_sections
5865
5866 #undef elf_backend_discard_info
5867 #define elf_backend_discard_info \
5868 bfinfdpic_elf_discard_info
5869 #undef elf_backend_can_make_relative_eh_frame
5870 #define elf_backend_can_make_relative_eh_frame \
5871 bfinfdpic_elf_use_relative_eh_frame
5872 #undef elf_backend_can_make_lsda_relative_eh_frame
5873 #define elf_backend_can_make_lsda_relative_eh_frame \
5874 bfinfdpic_elf_use_relative_eh_frame
5875 #undef elf_backend_encode_eh_address
5876 #define elf_backend_encode_eh_address \
5877 bfinfdpic_elf_encode_eh_address
5878
5879 #undef elf_backend_may_use_rel_p
5880 #define elf_backend_may_use_rel_p 1
5881 #undef elf_backend_may_use_rela_p
5882 #define elf_backend_may_use_rela_p 1
5883 /* We use REL for dynamic relocations only. */
5884 #undef elf_backend_default_use_rela_p
5885 #define elf_backend_default_use_rela_p 1
5886
5887 #undef elf_backend_omit_section_dynsym
5888 #define elf_backend_omit_section_dynsym _bfinfdpic_link_omit_section_dynsym
5889
5890 #include "elf32-target.h"