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Rename u.weakdef and make it a circular list
[deliverable/binutils-gdb.git] / bfd / elf32-vax.c
1 /* VAX series support for 32-bit ELF
2 Copyright (C) 1993-2017 Free Software Foundation, Inc.
3 Contributed by Matt Thomas <matt@3am-software.com>.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/vax.h"
28
29 static reloc_howto_type *reloc_type_lookup (bfd *, bfd_reloc_code_real_type);
30 static void rtype_to_howto (bfd *, arelent *, Elf_Internal_Rela *);
31 static struct bfd_hash_entry *elf_vax_link_hash_newfunc (struct bfd_hash_entry *,
32 struct bfd_hash_table *,
33 const char *);
34 static struct bfd_link_hash_table *elf_vax_link_hash_table_create (bfd *);
35 static bfd_boolean elf_vax_check_relocs (bfd *, struct bfd_link_info *,
36 asection *, const Elf_Internal_Rela *);
37 static bfd_boolean elf_vax_adjust_dynamic_symbol (struct bfd_link_info *,
38 struct elf_link_hash_entry *);
39 static bfd_boolean elf_vax_size_dynamic_sections (bfd *, struct bfd_link_info *);
40 static bfd_boolean elf_vax_relocate_section (bfd *, struct bfd_link_info *,
41 bfd *, asection *, bfd_byte *,
42 Elf_Internal_Rela *,
43 Elf_Internal_Sym *, asection **);
44 static bfd_boolean elf_vax_finish_dynamic_symbol (bfd *, struct bfd_link_info *,
45 struct elf_link_hash_entry *,
46 Elf_Internal_Sym *);
47 static bfd_boolean elf_vax_finish_dynamic_sections (bfd *,
48 struct bfd_link_info *);
49 static bfd_vma elf_vax_plt_sym_val (bfd_vma, const asection *,
50 const arelent *);
51
52 static bfd_boolean elf32_vax_set_private_flags (bfd *, flagword);
53 static bfd_boolean elf32_vax_print_private_bfd_data (bfd *, void *);
54
55 static reloc_howto_type howto_table[] = {
56 HOWTO (R_VAX_NONE, /* type */
57 0, /* rightshift */
58 3, /* size (0 = byte, 1 = short, 2 = long) */
59 0, /* bitsize */
60 FALSE, /* pc_relative */
61 0, /* bitpos */
62 complain_overflow_dont, /* complain_on_overflow */
63 bfd_elf_generic_reloc, /* special_function */
64 "R_VAX_NONE", /* name */
65 FALSE, /* partial_inplace */
66 0, /* src_mask */
67 0x00000000, /* dst_mask */
68 FALSE), /* pcrel_offset */
69
70 HOWTO (R_VAX_32, /* type */
71 0, /* rightshift */
72 2, /* size (0 = byte, 1 = short, 2 = long) */
73 32, /* bitsize */
74 FALSE, /* pc_relative */
75 0, /* bitpos */
76 complain_overflow_bitfield, /* complain_on_overflow */
77 bfd_elf_generic_reloc, /* special_function */
78 "R_VAX_32", /* name */
79 FALSE, /* partial_inplace */
80 0, /* src_mask */
81 0xffffffff, /* dst_mask */
82 FALSE), /* pcrel_offset */
83
84 HOWTO (R_VAX_16, /* type */
85 0, /* rightshift */
86 1, /* size (0 = byte, 1 = short, 2 = long) */
87 16, /* bitsize */
88 FALSE, /* pc_relative */
89 0, /* bitpos */
90 complain_overflow_bitfield, /* complain_on_overflow */
91 bfd_elf_generic_reloc, /* special_function */
92 "R_VAX_16", /* name */
93 FALSE, /* partial_inplace */
94 0, /* src_mask */
95 0x0000ffff, /* dst_mask */
96 FALSE), /* pcrel_offset */
97
98 HOWTO (R_VAX_8, /* type */
99 0, /* rightshift */
100 0, /* size (0 = byte, 1 = short, 2 = long) */
101 8, /* bitsize */
102 FALSE, /* pc_relative */
103 0, /* bitpos */
104 complain_overflow_bitfield, /* complain_on_overflow */
105 bfd_elf_generic_reloc, /* special_function */
106 "R_VAX_8", /* name */
107 FALSE, /* partial_inplace */
108 0, /* src_mask */
109 0x000000ff, /* dst_mask */
110 FALSE), /* pcrel_offset */
111
112 HOWTO (R_VAX_PC32, /* type */
113 0, /* rightshift */
114 2, /* size (0 = byte, 1 = short, 2 = long) */
115 32, /* bitsize */
116 TRUE, /* pc_relative */
117 0, /* bitpos */
118 complain_overflow_bitfield, /* complain_on_overflow */
119 bfd_elf_generic_reloc, /* special_function */
120 "R_VAX_PC32", /* name */
121 FALSE, /* partial_inplace */
122 0, /* src_mask */
123 0xffffffff, /* dst_mask */
124 TRUE), /* pcrel_offset */
125
126 HOWTO (R_VAX_PC16, /* type */
127 0, /* rightshift */
128 1, /* size (0 = byte, 1 = short, 2 = long) */
129 16, /* bitsize */
130 TRUE, /* pc_relative */
131 0, /* bitpos */
132 complain_overflow_signed, /* complain_on_overflow */
133 bfd_elf_generic_reloc, /* special_function */
134 "R_VAX_PC16", /* name */
135 FALSE, /* partial_inplace */
136 0, /* src_mask */
137 0x0000ffff, /* dst_mask */
138 TRUE), /* pcrel_offset */
139
140 HOWTO (R_VAX_PC8, /* type */
141 0, /* rightshift */
142 0, /* size (0 = byte, 1 = short, 2 = long) */
143 8, /* bitsize */
144 TRUE, /* pc_relative */
145 0, /* bitpos */
146 complain_overflow_signed, /* complain_on_overflow */
147 bfd_elf_generic_reloc, /* special_function */
148 "R_VAX_PC8", /* name */
149 FALSE, /* partial_inplace */
150 0, /* src_mask */
151 0x000000ff, /* dst_mask */
152 TRUE), /* pcrel_offset */
153
154 HOWTO (R_VAX_GOT32, /* type */
155 0, /* rightshift */
156 2, /* size (0 = byte, 1 = short, 2 = long) */
157 32, /* bitsize */
158 TRUE, /* pc_relative */
159 0, /* bitpos */
160 complain_overflow_bitfield, /* complain_on_overflow */
161 bfd_elf_generic_reloc, /* special_function */
162 "R_VAX_GOT32", /* name */
163 FALSE, /* partial_inplace */
164 0, /* src_mask */
165 0xffffffff, /* dst_mask */
166 TRUE), /* pcrel_offset */
167
168 EMPTY_HOWTO (-1),
169 EMPTY_HOWTO (-1),
170 EMPTY_HOWTO (-1),
171 EMPTY_HOWTO (-1),
172 EMPTY_HOWTO (-1),
173
174 HOWTO (R_VAX_PLT32, /* type */
175 0, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 32, /* bitsize */
178 TRUE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_bitfield, /* complain_on_overflow */
181 bfd_elf_generic_reloc, /* special_function */
182 "R_VAX_PLT32", /* name */
183 FALSE, /* partial_inplace */
184 0, /* src_mask */
185 0xffffffff, /* dst_mask */
186 TRUE), /* pcrel_offset */
187
188 EMPTY_HOWTO (-1),
189 EMPTY_HOWTO (-1),
190 EMPTY_HOWTO (-1),
191 EMPTY_HOWTO (-1),
192 EMPTY_HOWTO (-1),
193
194 HOWTO (R_VAX_COPY, /* type */
195 0, /* rightshift */
196 0, /* size (0 = byte, 1 = short, 2 = long) */
197 0, /* bitsize */
198 FALSE, /* pc_relative */
199 0, /* bitpos */
200 complain_overflow_dont, /* complain_on_overflow */
201 bfd_elf_generic_reloc, /* special_function */
202 "R_VAX_COPY", /* name */
203 FALSE, /* partial_inplace */
204 0, /* src_mask */
205 0xffffffff, /* dst_mask */
206 FALSE), /* pcrel_offset */
207
208 HOWTO (R_VAX_GLOB_DAT, /* type */
209 0, /* rightshift */
210 2, /* size (0 = byte, 1 = short, 2 = long) */
211 32, /* bitsize */
212 FALSE, /* pc_relative */
213 0, /* bitpos */
214 complain_overflow_dont, /* complain_on_overflow */
215 bfd_elf_generic_reloc, /* special_function */
216 "R_VAX_GLOB_DAT", /* name */
217 FALSE, /* partial_inplace */
218 0, /* src_mask */
219 0xffffffff, /* dst_mask */
220 FALSE), /* pcrel_offset */
221
222 HOWTO (R_VAX_JMP_SLOT, /* type */
223 0, /* rightshift */
224 2, /* size (0 = byte, 1 = short, 2 = long) */
225 32, /* bitsize */
226 FALSE, /* pc_relative */
227 0, /* bitpos */
228 complain_overflow_dont, /* complain_on_overflow */
229 bfd_elf_generic_reloc, /* special_function */
230 "R_VAX_JMP_SLOT", /* name */
231 FALSE, /* partial_inplace */
232 0, /* src_mask */
233 0xffffffff, /* dst_mask */
234 FALSE), /* pcrel_offset */
235
236 HOWTO (R_VAX_RELATIVE, /* type */
237 0, /* rightshift */
238 2, /* size (0 = byte, 1 = short, 2 = long) */
239 32, /* bitsize */
240 FALSE, /* pc_relative */
241 0, /* bitpos */
242 complain_overflow_dont, /* complain_on_overflow */
243 bfd_elf_generic_reloc, /* special_function */
244 "R_VAX_RELATIVE", /* name */
245 FALSE, /* partial_inplace */
246 0, /* src_mask */
247 0xffffffff, /* dst_mask */
248 FALSE), /* pcrel_offset */
249
250 /* GNU extension to record C++ vtable hierarchy */
251 HOWTO (R_VAX_GNU_VTINHERIT, /* type */
252 0, /* rightshift */
253 2, /* size (0 = byte, 1 = short, 2 = long) */
254 0, /* bitsize */
255 FALSE, /* pc_relative */
256 0, /* bitpos */
257 complain_overflow_dont, /* complain_on_overflow */
258 NULL, /* special_function */
259 "R_VAX_GNU_VTINHERIT", /* name */
260 FALSE, /* partial_inplace */
261 0, /* src_mask */
262 0, /* dst_mask */
263 FALSE), /* pcrel_offset */
264
265 /* GNU extension to record C++ vtable member usage */
266 HOWTO (R_VAX_GNU_VTENTRY, /* type */
267 0, /* rightshift */
268 2, /* size (0 = byte, 1 = short, 2 = long) */
269 0, /* bitsize */
270 FALSE, /* pc_relative */
271 0, /* bitpos */
272 complain_overflow_dont, /* complain_on_overflow */
273 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
274 "R_VAX_GNU_VTENTRY", /* name */
275 FALSE, /* partial_inplace */
276 0, /* src_mask */
277 0, /* dst_mask */
278 FALSE), /* pcrel_offset */
279 };
280
281 static void
282 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst)
283 {
284 unsigned int r_type;
285
286 r_type = ELF32_R_TYPE (dst->r_info);
287 if (r_type >= R_VAX_max)
288 {
289 /* xgettext:c-format */
290 _bfd_error_handler (_("%B: unrecognised VAX reloc number: %d"),
291 abfd, r_type);
292 bfd_set_error (bfd_error_bad_value);
293 r_type = R_VAX_NONE;
294 }
295 cache_ptr->howto = &howto_table[r_type];
296 }
297
298 #define elf_info_to_howto rtype_to_howto
299
300 static const struct
301 {
302 bfd_reloc_code_real_type bfd_val;
303 int elf_val;
304 } reloc_map[] = {
305 { BFD_RELOC_NONE, R_VAX_NONE },
306 { BFD_RELOC_32, R_VAX_32 },
307 { BFD_RELOC_16, R_VAX_16 },
308 { BFD_RELOC_8, R_VAX_8 },
309 { BFD_RELOC_32_PCREL, R_VAX_PC32 },
310 { BFD_RELOC_16_PCREL, R_VAX_PC16 },
311 { BFD_RELOC_8_PCREL, R_VAX_PC8 },
312 { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 },
313 { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 },
314 { BFD_RELOC_NONE, R_VAX_COPY },
315 { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT },
316 { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT },
317 { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE },
318 { BFD_RELOC_CTOR, R_VAX_32 },
319 { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT },
320 { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY },
321 };
322
323 static reloc_howto_type *
324 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code)
325 {
326 unsigned int i;
327 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
328 {
329 if (reloc_map[i].bfd_val == code)
330 return &howto_table[reloc_map[i].elf_val];
331 }
332 return 0;
333 }
334
335 static reloc_howto_type *
336 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
337 const char *r_name)
338 {
339 unsigned int i;
340
341 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++)
342 if (howto_table[i].name != NULL
343 && strcasecmp (howto_table[i].name, r_name) == 0)
344 return &howto_table[i];
345
346 return NULL;
347 }
348
349 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
350 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup
351 #define ELF_ARCH bfd_arch_vax
352 /* end code generated by elf.el */
353 \f
354 /* Functions for the VAX ELF linker. */
355
356 /* The name of the dynamic interpreter. This is put in the .interp
357 section. */
358
359 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so"
360
361 /* The size in bytes of an entry in the procedure linkage table. */
362
363 #define PLT_ENTRY_SIZE 12
364
365 /* The first entry in a procedure linkage table looks like this. See
366 the SVR4 ABI VAX supplement to see how this works. */
367
368 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] =
369 {
370 0xdd, 0xef, /* pushl l^ */
371 0, 0, 0, 0, /* offset to .plt.got + 4 */
372 0x17, 0xff, /* jmp @L^(pc) */
373 0, 0, 0, 0, /* offset to .plt.got + 8 */
374 };
375
376 /* Subsequent entries in a procedure linkage table look like this. */
377
378 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] =
379 {
380 0xfc, 0x0f, /* .word ^M<r11:r2> */
381 0x16, 0xef, /* jsb L^(pc) */
382 0, 0, 0, 0, /* replaced with offset to start of .plt */
383 0, 0, 0, 0, /* index into .rela.plt */
384 };
385
386 /* The VAX linker needs to keep track of the number of relocs that it
387 decides to copy in check_relocs for each symbol. This is so that it
388 can discard PC relative relocs if it doesn't need them when linking
389 with -Bsymbolic. We store the information in a field extending the
390 regular ELF linker hash table. */
391
392 /* This structure keeps track of the number of PC relative relocs we have
393 copied for a given symbol. */
394
395 struct elf_vax_pcrel_relocs_copied
396 {
397 /* Next section. */
398 struct elf_vax_pcrel_relocs_copied *next;
399 /* A section in dynobj. */
400 asection *section;
401 /* Number of relocs copied in this section. */
402 bfd_size_type count;
403 };
404
405 /* VAX ELF linker hash entry. */
406
407 struct elf_vax_link_hash_entry
408 {
409 struct elf_link_hash_entry root;
410
411 /* Number of PC relative relocs copied for this symbol. */
412 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied;
413
414 bfd_vma got_addend;
415 };
416
417 /* Declare this now that the above structures are defined. */
418
419 static bfd_boolean elf_vax_discard_copies (struct elf_vax_link_hash_entry *,
420 void *);
421
422 /* Declare this now that the above structures are defined. */
423
424 static bfd_boolean elf_vax_instantiate_got_entries (struct elf_link_hash_entry *,
425 void *);
426
427 /* Traverse an VAX ELF linker hash table. */
428
429 #define elf_vax_link_hash_traverse(table, func, info) \
430 (elf_link_hash_traverse \
431 ((table), \
432 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \
433 (info)))
434
435 /* Create an entry in an VAX ELF linker hash table. */
436
437 static struct bfd_hash_entry *
438 elf_vax_link_hash_newfunc (struct bfd_hash_entry *entry,
439 struct bfd_hash_table *table,
440 const char *string)
441 {
442 struct elf_vax_link_hash_entry *ret =
443 (struct elf_vax_link_hash_entry *) entry;
444
445 /* Allocate the structure if it has not already been allocated by a
446 subclass. */
447 if (ret == NULL)
448 ret = ((struct elf_vax_link_hash_entry *)
449 bfd_hash_allocate (table,
450 sizeof (struct elf_vax_link_hash_entry)));
451 if (ret == NULL)
452 return (struct bfd_hash_entry *) ret;
453
454 /* Call the allocation method of the superclass. */
455 ret = ((struct elf_vax_link_hash_entry *)
456 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
457 table, string));
458 if (ret != NULL)
459 {
460 ret->pcrel_relocs_copied = NULL;
461 }
462
463 return (struct bfd_hash_entry *) ret;
464 }
465
466 /* Create an VAX ELF linker hash table. */
467
468 static struct bfd_link_hash_table *
469 elf_vax_link_hash_table_create (bfd *abfd)
470 {
471 struct elf_link_hash_table *ret;
472 bfd_size_type amt = sizeof (struct elf_link_hash_table);
473
474 ret = bfd_zmalloc (amt);
475 if (ret == NULL)
476 return NULL;
477
478 if (!_bfd_elf_link_hash_table_init (ret, abfd,
479 elf_vax_link_hash_newfunc,
480 sizeof (struct elf_vax_link_hash_entry),
481 GENERIC_ELF_DATA))
482 {
483 free (ret);
484 return NULL;
485 }
486
487 return &ret->root;
488 }
489
490 /* Keep vax-specific flags in the ELF header */
491 static bfd_boolean
492 elf32_vax_set_private_flags (bfd *abfd, flagword flags)
493 {
494 elf_elfheader (abfd)->e_flags = flags;
495 elf_flags_init (abfd) = TRUE;
496 return TRUE;
497 }
498
499 /* Merge backend specific data from an object file to the output
500 object file when linking. */
501 static bfd_boolean
502 elf32_vax_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
503 {
504 bfd *obfd = info->output_bfd;
505 flagword in_flags;
506
507 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
508 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
509 return TRUE;
510
511 in_flags = elf_elfheader (ibfd)->e_flags;
512
513 if (!elf_flags_init (obfd))
514 {
515 elf_flags_init (obfd) = TRUE;
516 elf_elfheader (obfd)->e_flags = in_flags;
517 }
518
519 return TRUE;
520 }
521
522 /* Display the flags field */
523 static bfd_boolean
524 elf32_vax_print_private_bfd_data (bfd *abfd, void * ptr)
525 {
526 FILE *file = (FILE *) ptr;
527
528 BFD_ASSERT (abfd != NULL && ptr != NULL);
529
530 /* Print normal ELF private data. */
531 _bfd_elf_print_private_bfd_data (abfd, ptr);
532
533 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
534
535 /* xgettext:c-format */
536 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
537
538 if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC)
539 fprintf (file, _(" [nonpic]"));
540
541 if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT)
542 fprintf (file, _(" [d-float]"));
543
544 if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT)
545 fprintf (file, _(" [g-float]"));
546
547 fputc ('\n', file);
548
549 return TRUE;
550 }
551 /* Look through the relocs for a section during the first phase, and
552 allocate space in the global offset table or procedure linkage
553 table. */
554
555 static bfd_boolean
556 elf_vax_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec,
557 const Elf_Internal_Rela *relocs)
558 {
559 bfd *dynobj;
560 Elf_Internal_Shdr *symtab_hdr;
561 struct elf_link_hash_entry **sym_hashes;
562 const Elf_Internal_Rela *rel;
563 const Elf_Internal_Rela *rel_end;
564 asection *sreloc;
565
566 if (bfd_link_relocatable (info))
567 return TRUE;
568
569 dynobj = elf_hash_table (info)->dynobj;
570 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
571 sym_hashes = elf_sym_hashes (abfd);
572
573 sreloc = NULL;
574
575 rel_end = relocs + sec->reloc_count;
576 for (rel = relocs; rel < rel_end; rel++)
577 {
578 unsigned long r_symndx;
579 struct elf_link_hash_entry *h;
580
581 r_symndx = ELF32_R_SYM (rel->r_info);
582
583 if (r_symndx < symtab_hdr->sh_info)
584 h = NULL;
585 else
586 {
587 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
588 while (h->root.type == bfd_link_hash_indirect
589 || h->root.type == bfd_link_hash_warning)
590 h = (struct elf_link_hash_entry *) h->root.u.i.link;
591
592 /* PR15323, ref flags aren't set for references in the same
593 object. */
594 h->root.non_ir_ref_regular = 1;
595 }
596
597 switch (ELF32_R_TYPE (rel->r_info))
598 {
599 case R_VAX_GOT32:
600 BFD_ASSERT (h != NULL);
601
602 /* If this is a local symbol, we resolve it directly without
603 creating a global offset table entry. */
604 if (h->forced_local
605 || h == elf_hash_table (info)->hgot
606 || h == elf_hash_table (info)->hplt)
607 break;
608
609 /* This symbol requires a global offset table entry. */
610
611 if (dynobj == NULL)
612 {
613 /* Create the .got section. */
614 elf_hash_table (info)->dynobj = dynobj = abfd;
615 if (!_bfd_elf_create_got_section (dynobj, info))
616 return FALSE;
617 }
618
619 if (h != NULL)
620 {
621 struct elf_vax_link_hash_entry *eh;
622
623 eh = (struct elf_vax_link_hash_entry *) h;
624 if (h->got.refcount == -1)
625 {
626 h->got.refcount = 1;
627 eh->got_addend = rel->r_addend;
628 }
629 else
630 {
631 h->got.refcount++;
632 if (eh->got_addend != (bfd_vma) rel->r_addend)
633 _bfd_error_handler
634 /* xgettext:c-format */
635 (_("%B: warning: GOT addend of %Ld to `%s' does"
636 " not match previous GOT addend of %Ld"),
637 abfd, rel->r_addend, h->root.root.string,
638 eh->got_addend);
639
640 }
641 }
642 break;
643
644 case R_VAX_PLT32:
645 /* This symbol requires a procedure linkage table entry. We
646 actually build the entry in adjust_dynamic_symbol,
647 because this might be a case of linking PIC code which is
648 never referenced by a dynamic object, in which case we
649 don't need to generate a procedure linkage table entry
650 after all. */
651 BFD_ASSERT (h != NULL);
652
653 /* If this is a local symbol, we resolve it directly without
654 creating a procedure linkage table entry. */
655 if (h->forced_local)
656 break;
657
658 h->needs_plt = 1;
659 if (h->plt.refcount == -1)
660 h->plt.refcount = 1;
661 else
662 h->plt.refcount++;
663 break;
664
665 case R_VAX_PC8:
666 case R_VAX_PC16:
667 case R_VAX_PC32:
668 /* If we are creating a shared library and this is not a local
669 symbol, we need to copy the reloc into the shared library.
670 However when linking with -Bsymbolic and this is a global
671 symbol which is defined in an object we are including in the
672 link (i.e., DEF_REGULAR is set), then we can resolve the
673 reloc directly. At this point we have not seen all the input
674 files, so it is possible that DEF_REGULAR is not set now but
675 will be set later (it is never cleared). We account for that
676 possibility below by storing information in the
677 pcrel_relocs_copied field of the hash table entry. */
678 if (!(bfd_link_pic (info)
679 && (sec->flags & SEC_ALLOC) != 0
680 && h != NULL
681 && (!info->symbolic
682 || !h->def_regular)))
683 {
684 if (h != NULL
685 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
686 && !h->forced_local)
687 {
688 /* Make sure a plt entry is created for this symbol if
689 it turns out to be a function defined by a dynamic
690 object. */
691 if (h->plt.refcount == -1)
692 h->plt.refcount = 1;
693 else
694 h->plt.refcount++;
695 }
696 break;
697 }
698 /* If this is a local symbol, we can resolve it directly. */
699 if (h != NULL
700 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
701 || h->forced_local))
702 break;
703
704 /* Fall through. */
705 case R_VAX_8:
706 case R_VAX_16:
707 case R_VAX_32:
708 if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
709 {
710 /* Make sure a plt entry is created for this symbol if it
711 turns out to be a function defined by a dynamic object. */
712 if (h->plt.refcount == -1)
713 h->plt.refcount = 1;
714 else
715 h->plt.refcount++;
716 }
717
718 /* If we are creating a shared library, we need to copy the
719 reloc into the shared library. */
720 if (bfd_link_pic (info)
721 && (sec->flags & SEC_ALLOC) != 0)
722 {
723 /* When creating a shared object, we must copy these
724 reloc types into the output file. We create a reloc
725 section in dynobj and make room for this reloc. */
726 if (sreloc == NULL)
727 {
728 sreloc = _bfd_elf_make_dynamic_reloc_section
729 (sec, dynobj, 2, abfd, /*rela?*/ TRUE);
730
731 if (sreloc == NULL)
732 return FALSE;
733
734 if (sec->flags & SEC_READONLY)
735 info->flags |= DF_TEXTREL;
736 }
737
738 sreloc->size += sizeof (Elf32_External_Rela);
739
740 /* If we are linking with -Bsymbolic, we count the number of
741 PC relative relocations we have entered for this symbol,
742 so that we can discard them again if the symbol is later
743 defined by a regular object. Note that this function is
744 only called if we are using a vaxelf linker hash table,
745 which means that h is really a pointer to an
746 elf_vax_link_hash_entry. */
747 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8
748 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16
749 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32)
750 && info->symbolic)
751 {
752 struct elf_vax_link_hash_entry *eh;
753 struct elf_vax_pcrel_relocs_copied *p;
754
755 eh = (struct elf_vax_link_hash_entry *) h;
756
757 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
758 if (p->section == sreloc)
759 break;
760
761 if (p == NULL)
762 {
763 p = ((struct elf_vax_pcrel_relocs_copied *)
764 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
765 if (p == NULL)
766 return FALSE;
767 p->next = eh->pcrel_relocs_copied;
768 eh->pcrel_relocs_copied = p;
769 p->section = sreloc;
770 p->count = 0;
771 }
772
773 ++p->count;
774 }
775 }
776
777 break;
778
779 /* This relocation describes the C++ object vtable hierarchy.
780 Reconstruct it for later use during GC. */
781 case R_VAX_GNU_VTINHERIT:
782 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
783 return FALSE;
784 break;
785
786 /* This relocation describes which C++ vtable entries are actually
787 used. Record for later use during GC. */
788 case R_VAX_GNU_VTENTRY:
789 BFD_ASSERT (h != NULL);
790 if (h != NULL
791 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
792 return FALSE;
793 break;
794
795 default:
796 break;
797 }
798 }
799
800 return TRUE;
801 }
802
803 /* Return the section that should be marked against GC for a given
804 relocation. */
805
806 static asection *
807 elf_vax_gc_mark_hook (asection *sec,
808 struct bfd_link_info *info,
809 Elf_Internal_Rela *rel,
810 struct elf_link_hash_entry *h,
811 Elf_Internal_Sym *sym)
812 {
813 if (h != NULL)
814 switch (ELF32_R_TYPE (rel->r_info))
815 {
816 case R_VAX_GNU_VTINHERIT:
817 case R_VAX_GNU_VTENTRY:
818 return NULL;
819 }
820
821 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
822 }
823
824 /* Adjust a symbol defined by a dynamic object and referenced by a
825 regular object. The current definition is in some section of the
826 dynamic object, but we're not including those sections. We have to
827 change the definition to something the rest of the link can
828 understand. */
829
830 static bfd_boolean
831 elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info,
832 struct elf_link_hash_entry *h)
833 {
834 bfd *dynobj;
835 asection *s;
836
837 dynobj = elf_hash_table (info)->dynobj;
838
839 /* Make sure we know what is going on here. */
840 BFD_ASSERT (dynobj != NULL
841 && (h->needs_plt
842 || h->is_weakalias
843 || (h->def_dynamic
844 && h->ref_regular
845 && !h->def_regular)));
846
847 /* If this is a function, put it in the procedure linkage table. We
848 will fill in the contents of the procedure linkage table later,
849 when we know the address of the .got section. */
850 if (h->type == STT_FUNC
851 || h->needs_plt)
852 {
853 if (h->plt.refcount <= 0
854 || SYMBOL_CALLS_LOCAL (info, h)
855 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
856 && h->root.type == bfd_link_hash_undefweak))
857 {
858 /* This case can occur if we saw a PLTxx reloc in an input
859 file, but the symbol was never referred to by a dynamic
860 object, or if all references were garbage collected. In
861 such a case, we don't actually need to build a procedure
862 linkage table, and we can just do a PCxx reloc instead. */
863 h->plt.offset = (bfd_vma) -1;
864 h->needs_plt = 0;
865 return TRUE;
866 }
867
868 s = elf_hash_table (info)->splt;
869 BFD_ASSERT (s != NULL);
870
871 /* If this is the first .plt entry, make room for the special
872 first entry. */
873 if (s->size == 0)
874 {
875 s->size += PLT_ENTRY_SIZE;
876 }
877
878 /* If this symbol is not defined in a regular file, and we are
879 not generating a shared library, then set the symbol to this
880 location in the .plt. This is required to make function
881 pointers compare as equal between the normal executable and
882 the shared library. */
883 if (!bfd_link_pic (info)
884 && !h->def_regular)
885 {
886 h->root.u.def.section = s;
887 h->root.u.def.value = s->size;
888 }
889
890 h->plt.offset = s->size;
891
892 /* Make room for this entry. */
893 s->size += PLT_ENTRY_SIZE;
894
895 /* We also need to make an entry in the .got.plt section, which
896 will be placed in the .got section by the linker script. */
897
898 s = elf_hash_table (info)->sgotplt;
899 BFD_ASSERT (s != NULL);
900 s->size += 4;
901
902 /* We also need to make an entry in the .rela.plt section. */
903
904 s = elf_hash_table (info)->srelplt;
905 BFD_ASSERT (s != NULL);
906 s->size += sizeof (Elf32_External_Rela);
907
908 return TRUE;
909 }
910
911 /* Reinitialize the plt offset now that it is not used as a reference
912 count any more. */
913 h->plt.offset = (bfd_vma) -1;
914
915 /* If this is a weak symbol, and there is a real definition, the
916 processor independent code will have arranged for us to see the
917 real definition first, and we can just use the same value. */
918 if (h->is_weakalias)
919 {
920 struct elf_link_hash_entry *def = weakdef (h);
921 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
922 h->root.u.def.section = def->root.u.def.section;
923 h->root.u.def.value = def->root.u.def.value;
924 return TRUE;
925 }
926
927 /* This is a reference to a symbol defined by a dynamic object which
928 is not a function. */
929
930 /* If we are creating a shared library, we must presume that the
931 only references to the symbol are via the global offset table.
932 For such cases we need not do anything here; the relocations will
933 be handled correctly by relocate_section. */
934 if (bfd_link_pic (info))
935 return TRUE;
936
937 /* We must allocate the symbol in our .dynbss section, which will
938 become part of the .bss section of the executable. There will be
939 an entry for this symbol in the .dynsym section. The dynamic
940 object will contain position independent code, so all references
941 from the dynamic object to this symbol will go through the global
942 offset table. The dynamic linker will use the .dynsym entry to
943 determine the address it must put in the global offset table, so
944 both the dynamic object and the regular object will refer to the
945 same memory location for the variable. */
946
947 s = bfd_get_linker_section (dynobj, ".dynbss");
948 BFD_ASSERT (s != NULL);
949
950 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to
951 copy the initial value out of the dynamic object and into the
952 runtime process image. We need to remember the offset into the
953 .rela.bss section we are going to use. */
954 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
955 {
956 asection *srel;
957
958 srel = bfd_get_linker_section (dynobj, ".rela.bss");
959 BFD_ASSERT (srel != NULL);
960 srel->size += sizeof (Elf32_External_Rela);
961 h->needs_copy = 1;
962 }
963
964 return _bfd_elf_adjust_dynamic_copy (info, h, s);
965 }
966
967 /* This function is called via elf_link_hash_traverse. It resets GOT
968 and PLT (.GOT) reference counts back to -1 so normal PC32 relocation
969 will be done. */
970
971 static bfd_boolean
972 elf_vax_discard_got_entries (struct elf_link_hash_entry *h,
973 void *infoptr ATTRIBUTE_UNUSED)
974 {
975 h->got.refcount = -1;
976 h->plt.refcount = -1;
977
978 return TRUE;
979 }
980
981 /* Discard unused dynamic data if this is a static link. */
982
983 static bfd_boolean
984 elf_vax_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
985 struct bfd_link_info *info)
986 {
987 bfd *dynobj;
988 asection *s;
989
990 dynobj = elf_hash_table (info)->dynobj;
991
992 if (dynobj && !elf_hash_table (info)->dynamic_sections_created)
993 {
994 /* We may have created entries in the .rela.got and .got sections.
995 However, if we are not creating the dynamic sections, we will
996 not actually use these entries. Reset the size of .rela.got
997 and .got, which will cause them to get stripped from the output
998 file below. */
999 s = elf_hash_table (info)->srelgot;
1000 if (s != NULL)
1001 s->size = 0;
1002 s = elf_hash_table (info)->sgotplt;
1003 if (s != NULL)
1004 s->size = 0;
1005 s = elf_hash_table (info)->sgot;
1006 if (s != NULL)
1007 s->size = 0;
1008 }
1009
1010 /* If this is a static link, we need to discard all the got entries we've
1011 recorded. */
1012 if (!dynobj || !elf_hash_table (info)->dynamic_sections_created)
1013 elf_link_hash_traverse (elf_hash_table (info),
1014 elf_vax_discard_got_entries,
1015 info);
1016
1017 return TRUE;
1018 }
1019
1020 /* Set the sizes of the dynamic sections. */
1021
1022 static bfd_boolean
1023 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1024 {
1025 bfd *dynobj;
1026 asection *s;
1027 bfd_boolean plt;
1028 bfd_boolean relocs;
1029 bfd_boolean reltext;
1030
1031 dynobj = elf_hash_table (info)->dynobj;
1032 BFD_ASSERT (dynobj != NULL);
1033
1034 if (elf_hash_table (info)->dynamic_sections_created)
1035 {
1036 /* Set the contents of the .interp section to the interpreter. */
1037 if (bfd_link_executable (info) && !info->nointerp)
1038 {
1039 s = bfd_get_linker_section (dynobj, ".interp");
1040 BFD_ASSERT (s != NULL);
1041 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1042 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1043 }
1044 }
1045
1046 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1047 relative relocs against symbols defined in a regular object. We
1048 allocated space for them in the check_relocs routine, but we will not
1049 fill them in in the relocate_section routine. */
1050 if (bfd_link_pic (info) && info->symbolic)
1051 elf_vax_link_hash_traverse (elf_hash_table (info),
1052 elf_vax_discard_copies,
1053 NULL);
1054
1055 /* If this is a -Bsymbolic shared link, we need to discard all the got
1056 entries we've recorded. Otherwise, we need to instantiate (allocate
1057 space for them). */
1058 elf_link_hash_traverse (elf_hash_table (info),
1059 elf_vax_instantiate_got_entries,
1060 info);
1061
1062 /* The check_relocs and adjust_dynamic_symbol entry points have
1063 determined the sizes of the various dynamic sections. Allocate
1064 memory for them. */
1065 plt = FALSE;
1066 relocs = FALSE;
1067 reltext = FALSE;
1068 for (s = dynobj->sections; s != NULL; s = s->next)
1069 {
1070 const char *name;
1071
1072 if ((s->flags & SEC_LINKER_CREATED) == 0)
1073 continue;
1074
1075 /* It's OK to base decisions on the section name, because none
1076 of the dynobj section names depend upon the input files. */
1077 name = bfd_get_section_name (dynobj, s);
1078
1079 if (strcmp (name, ".plt") == 0)
1080 {
1081 /* Remember whether there is a PLT. */
1082 plt = s->size != 0;
1083 }
1084 else if (CONST_STRNEQ (name, ".rela"))
1085 {
1086 if (s->size != 0)
1087 {
1088 asection *target;
1089
1090 /* Remember whether there are any reloc sections other
1091 than .rela.plt. */
1092 if (strcmp (name, ".rela.plt") != 0)
1093 {
1094 const char *outname;
1095
1096 relocs = TRUE;
1097
1098 /* If this relocation section applies to a read only
1099 section, then we probably need a DT_TEXTREL
1100 entry. .rela.plt is actually associated with
1101 .got.plt, which is never readonly. */
1102 outname = bfd_get_section_name (output_bfd,
1103 s->output_section);
1104 target = bfd_get_section_by_name (output_bfd, outname + 5);
1105 if (target != NULL
1106 && (target->flags & SEC_READONLY) != 0
1107 && (target->flags & SEC_ALLOC) != 0)
1108 reltext = TRUE;
1109 }
1110
1111 /* We use the reloc_count field as a counter if we need
1112 to copy relocs into the output file. */
1113 s->reloc_count = 0;
1114 }
1115 }
1116 else if (! CONST_STRNEQ (name, ".got")
1117 && strcmp (name, ".dynbss") != 0)
1118 {
1119 /* It's not one of our sections, so don't allocate space. */
1120 continue;
1121 }
1122
1123 if (s->size == 0)
1124 {
1125 /* If we don't need this section, strip it from the
1126 output file. This is mostly to handle .rela.bss and
1127 .rela.plt. We must create both sections in
1128 create_dynamic_sections, because they must be created
1129 before the linker maps input sections to output
1130 sections. The linker does that before
1131 adjust_dynamic_symbol is called, and it is that
1132 function which decides whether anything needs to go
1133 into these sections. */
1134 s->flags |= SEC_EXCLUDE;
1135 continue;
1136 }
1137
1138 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1139 continue;
1140
1141 /* Allocate memory for the section contents. */
1142 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1143 if (s->contents == NULL)
1144 return FALSE;
1145 }
1146
1147 if (elf_hash_table (info)->dynamic_sections_created)
1148 {
1149 /* Add some entries to the .dynamic section. We fill in the
1150 values later, in elf_vax_finish_dynamic_sections, but we
1151 must add the entries now so that we get the correct size for
1152 the .dynamic section. The DT_DEBUG entry is filled in by the
1153 dynamic linker and used by the debugger. */
1154 #define add_dynamic_entry(TAG, VAL) \
1155 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1156
1157 if (!bfd_link_pic (info))
1158 {
1159 if (!add_dynamic_entry (DT_DEBUG, 0))
1160 return FALSE;
1161 }
1162
1163 if (plt)
1164 {
1165 if (!add_dynamic_entry (DT_PLTGOT, 0)
1166 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1167 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1168 || !add_dynamic_entry (DT_JMPREL, 0))
1169 return FALSE;
1170 }
1171
1172 if (relocs)
1173 {
1174 if (!add_dynamic_entry (DT_RELA, 0)
1175 || !add_dynamic_entry (DT_RELASZ, 0)
1176 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1177 return FALSE;
1178 }
1179
1180 if (reltext || (info->flags & DF_TEXTREL) != 0)
1181 {
1182 if (!add_dynamic_entry (DT_TEXTREL, 0))
1183 return FALSE;
1184 }
1185 }
1186 #undef add_dynamic_entry
1187
1188 return TRUE;
1189 }
1190
1191 /* This function is called via elf_vax_link_hash_traverse if we are
1192 creating a shared object with -Bsymbolic. It discards the space
1193 allocated to copy PC relative relocs against symbols which are defined
1194 in regular objects. We allocated space for them in the check_relocs
1195 routine, but we won't fill them in in the relocate_section routine. */
1196
1197 static bfd_boolean
1198 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h,
1199 void * ignore ATTRIBUTE_UNUSED)
1200 {
1201 struct elf_vax_pcrel_relocs_copied *s;
1202
1203 /* We only discard relocs for symbols defined in a regular object. */
1204 if (!h->root.def_regular)
1205 return TRUE;
1206
1207 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1208 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1209
1210 return TRUE;
1211 }
1212
1213 /* This function is called via elf_link_hash_traverse. It looks for
1214 entries that have GOT or PLT (.GOT) references. If creating a shared
1215 object with -Bsymbolic, or the symbol has been forced local, then it
1216 resets the reference count back to -1 so normal PC32 relocation will
1217 be done. Otherwise space in the .got and .rela.got will be reserved
1218 for the symbol. */
1219
1220 static bfd_boolean
1221 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, void * infoptr)
1222 {
1223 struct bfd_link_info *info = (struct bfd_link_info *) infoptr;
1224 bfd *dynobj;
1225 asection *sgot;
1226 asection *srelgot;
1227
1228 /* We don't care about non-GOT (and non-PLT) entries. */
1229 if (h->got.refcount <= 0 && h->plt.refcount <= 0)
1230 return TRUE;
1231
1232 dynobj = elf_hash_table (info)->dynobj;
1233 BFD_ASSERT (dynobj != NULL);
1234
1235 sgot = elf_hash_table (info)->sgot;
1236 srelgot = elf_hash_table (info)->srelgot;
1237
1238 if (SYMBOL_REFERENCES_LOCAL (info, h))
1239 {
1240 h->got.refcount = -1;
1241 h->plt.refcount = -1;
1242 }
1243 else if (h->got.refcount > 0)
1244 {
1245 /* Make sure this symbol is output as a dynamic symbol. */
1246 if (h->dynindx == -1)
1247 {
1248 if (!bfd_elf_link_record_dynamic_symbol (info, h))
1249 return FALSE;
1250 }
1251
1252 /* Allocate space in the .got and .rela.got sections. */
1253 sgot->size += 4;
1254 srelgot->size += sizeof (Elf32_External_Rela);
1255 }
1256
1257 return TRUE;
1258 }
1259
1260 /* Relocate an VAX ELF section. */
1261
1262 static bfd_boolean
1263 elf_vax_relocate_section (bfd *output_bfd,
1264 struct bfd_link_info *info,
1265 bfd *input_bfd,
1266 asection *input_section,
1267 bfd_byte *contents,
1268 Elf_Internal_Rela *relocs,
1269 Elf_Internal_Sym *local_syms,
1270 asection **local_sections)
1271 {
1272 Elf_Internal_Shdr *symtab_hdr;
1273 struct elf_link_hash_entry **sym_hashes;
1274 bfd_vma plt_index;
1275 bfd_vma got_offset;
1276 asection *sgot;
1277 asection *splt;
1278 asection *sgotplt;
1279 asection *sreloc;
1280 Elf_Internal_Rela *rel;
1281 Elf_Internal_Rela *relend;
1282
1283 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1284 sym_hashes = elf_sym_hashes (input_bfd);
1285
1286 sgot = NULL;
1287 splt = NULL;
1288 sgotplt = NULL;
1289 sreloc = NULL;
1290
1291 rel = relocs;
1292 relend = relocs + input_section->reloc_count;
1293 for (; rel < relend; rel++)
1294 {
1295 int r_type;
1296 reloc_howto_type *howto;
1297 unsigned long r_symndx;
1298 struct elf_link_hash_entry *h;
1299 Elf_Internal_Sym *sym;
1300 asection *sec;
1301 bfd_vma relocation;
1302 bfd_reloc_status_type r;
1303
1304 r_type = ELF32_R_TYPE (rel->r_info);
1305 if (r_type < 0 || r_type >= (int) R_VAX_max)
1306 {
1307 bfd_set_error (bfd_error_bad_value);
1308 return FALSE;
1309 }
1310 howto = howto_table + r_type;
1311
1312 r_symndx = ELF32_R_SYM (rel->r_info);
1313 h = NULL;
1314 sym = NULL;
1315 sec = NULL;
1316 if (r_symndx < symtab_hdr->sh_info)
1317 {
1318 sym = local_syms + r_symndx;
1319 sec = local_sections[r_symndx];
1320 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1321 }
1322 else
1323 {
1324 bfd_boolean unresolved_reloc;
1325 bfd_boolean warned, ignored;
1326
1327 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1328 r_symndx, symtab_hdr, sym_hashes,
1329 h, sec, relocation,
1330 unresolved_reloc, warned, ignored);
1331
1332 if ((h->root.type == bfd_link_hash_defined
1333 || h->root.type == bfd_link_hash_defweak)
1334 && ((r_type == R_VAX_PLT32
1335 && h->plt.offset != (bfd_vma) -1
1336 && !h->forced_local
1337 && elf_hash_table (info)->dynamic_sections_created)
1338 || (r_type == R_VAX_GOT32
1339 && h->got.offset != (bfd_vma) -1
1340 && !h->forced_local
1341 && elf_hash_table (info)->dynamic_sections_created
1342 && (! bfd_link_pic (info)
1343 || (! info->symbolic && h->dynindx != -1)
1344 || !h->def_regular))
1345 || (bfd_link_pic (info)
1346 && ((! info->symbolic && h->dynindx != -1)
1347 || !h->def_regular)
1348 && ((input_section->flags & SEC_ALLOC) != 0
1349 /* DWARF will emit R_VAX_32 relocations in its
1350 sections against symbols defined externally
1351 in shared libraries. We can't do anything
1352 with them here. */
1353
1354 || ((input_section->flags & SEC_DEBUGGING) != 0
1355 && h->def_dynamic))
1356 && (r_type == R_VAX_8
1357 || r_type == R_VAX_16
1358 || r_type == R_VAX_32))))
1359 /* In these cases, we don't need the relocation
1360 value. We check specially because in some
1361 obscure cases sec->output_section will be NULL. */
1362 relocation = 0;
1363 }
1364
1365 if (sec != NULL && discarded_section (sec))
1366 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1367 rel, 1, relend, howto, 0, contents);
1368
1369 if (bfd_link_relocatable (info))
1370 continue;
1371
1372 switch (r_type)
1373 {
1374 case R_VAX_GOT32:
1375 /* Relocation is to the address of the entry for this symbol
1376 in the global offset table. */
1377
1378 /* Resolve a GOTxx reloc against a local symbol directly,
1379 without using the global offset table. */
1380 if (h == NULL
1381 || h->got.offset == (bfd_vma) -1)
1382 break;
1383
1384 {
1385 bfd_vma off;
1386
1387 sgot = elf_hash_table (info)->sgot;
1388 BFD_ASSERT (sgot != NULL);
1389
1390 off = h->got.offset;
1391 BFD_ASSERT (off < sgot->size);
1392
1393 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off);
1394
1395 relocation = sgot->output_offset + off;
1396 /* The GOT relocation uses the addend. */
1397 rel->r_addend = 0;
1398
1399 /* Change the reference to be indirect. */
1400 contents[rel->r_offset - 1] |= 0x10;
1401 relocation += sgot->output_section->vma;
1402 }
1403 break;
1404
1405 case R_VAX_PC32:
1406 /* If we are creating an executable and the function this
1407 reloc refers to is in a shared lib, then we made a PLT
1408 entry for this symbol and need to handle the reloc like
1409 a PLT reloc. */
1410 if (bfd_link_pic (info))
1411 goto r_vax_pc32_shared;
1412 /* Fall through. */
1413 case R_VAX_PLT32:
1414 /* Relocation is to the entry for this symbol in the
1415 procedure linkage table. */
1416
1417 /* Resolve a PLTxx reloc against a local symbol directly,
1418 without using the procedure linkage table. */
1419 if (h == NULL
1420 || h->plt.offset == (bfd_vma) -1)
1421 break;
1422
1423 splt = elf_hash_table (info)->splt;
1424 BFD_ASSERT (splt != NULL);
1425
1426 sgotplt = elf_hash_table (info)->sgotplt;
1427 BFD_ASSERT (sgotplt != NULL);
1428
1429 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1430
1431 /* Get the offset into the .got table of the entry that
1432 corresponds to this function. Each .got entry is 4 bytes.
1433 The first two are reserved. */
1434 got_offset = (plt_index + 3) * 4;
1435
1436 /* We want the relocation to point into the .got.plt instead
1437 of the plt itself. */
1438 relocation = (sgotplt->output_section->vma
1439 + sgotplt->output_offset
1440 + got_offset);
1441 contents[rel->r_offset-1] |= 0x10; /* make indirect */
1442 if (rel->r_addend == 2)
1443 {
1444 h->plt.offset |= 1;
1445 }
1446 else if (rel->r_addend != 0)
1447 _bfd_error_handler
1448 /* xgettext:c-format */
1449 (_("%B: warning: PLT addend of %Ld to `%s'"
1450 " from %A section ignored"),
1451 input_bfd, rel->r_addend, h->root.root.string, input_section);
1452 rel->r_addend = 0;
1453
1454 break;
1455
1456 case R_VAX_PC8:
1457 case R_VAX_PC16:
1458 r_vax_pc32_shared:
1459 if (h == NULL
1460 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1461 || h->forced_local)
1462 break;
1463 /* Fall through. */
1464 case R_VAX_8:
1465 case R_VAX_16:
1466 case R_VAX_32:
1467 if (bfd_link_pic (info)
1468 && r_symndx != STN_UNDEF
1469 && (input_section->flags & SEC_ALLOC) != 0
1470 && ((r_type != R_VAX_PC8
1471 && r_type != R_VAX_PC16
1472 && r_type != R_VAX_PC32)
1473 || ((input_section->flags & SEC_CODE)
1474 && (!info->symbolic
1475 || (!h->def_regular && h->type != STT_SECTION)))))
1476 {
1477 Elf_Internal_Rela outrel;
1478 bfd_byte *loc;
1479 bfd_boolean skip, relocate;
1480
1481 /* When generating a shared object, these relocations
1482 are copied into the output file to be resolved at run
1483 time. */
1484 if (sreloc == NULL)
1485 {
1486 sreloc = _bfd_elf_get_dynamic_reloc_section
1487 (input_bfd, input_section, /*rela?*/ TRUE);
1488 if (sreloc == NULL)
1489 return FALSE;
1490 }
1491
1492 skip = FALSE;
1493 relocate = FALSE;
1494
1495 outrel.r_offset =
1496 _bfd_elf_section_offset (output_bfd, info, input_section,
1497 rel->r_offset);
1498 if (outrel.r_offset == (bfd_vma) -1)
1499 skip = TRUE;
1500 if (outrel.r_offset == (bfd_vma) -2)
1501 skip = TRUE, relocate = TRUE;
1502 outrel.r_offset += (input_section->output_section->vma
1503 + input_section->output_offset);
1504
1505 if (skip)
1506 memset (&outrel, 0, sizeof outrel);
1507 /* h->dynindx may be -1 if the symbol was marked to
1508 become local. */
1509 else if (h != NULL
1510 && ((! info->symbolic && h->dynindx != -1)
1511 || !h->def_regular))
1512 {
1513 BFD_ASSERT (h->dynindx != -1);
1514 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1515 outrel.r_addend = relocation + rel->r_addend;
1516 }
1517 else
1518 {
1519 if (r_type == R_VAX_32)
1520 {
1521 relocate = TRUE;
1522 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE);
1523 BFD_ASSERT (bfd_get_signed_32 (input_bfd,
1524 &contents[rel->r_offset]) == 0);
1525 outrel.r_addend = relocation + rel->r_addend;
1526 }
1527 else
1528 {
1529 long indx;
1530
1531 if (bfd_is_abs_section (sec))
1532 indx = 0;
1533 else if (sec == NULL || sec->owner == NULL)
1534 {
1535 bfd_set_error (bfd_error_bad_value);
1536 return FALSE;
1537 }
1538 else
1539 {
1540 asection *osec;
1541
1542 /* We are turning this relocation into one
1543 against a section symbol. It would be
1544 proper to subtract the symbol's value,
1545 osec->vma, from the emitted reloc addend,
1546 but ld.so expects buggy relocs. */
1547 osec = sec->output_section;
1548 indx = elf_section_data (osec)->dynindx;
1549 if (indx == 0)
1550 {
1551 struct elf_link_hash_table *htab;
1552 htab = elf_hash_table (info);
1553 osec = htab->text_index_section;
1554 indx = elf_section_data (osec)->dynindx;
1555 }
1556 BFD_ASSERT (indx != 0);
1557 }
1558
1559 outrel.r_info = ELF32_R_INFO (indx, r_type);
1560 outrel.r_addend = relocation + rel->r_addend;
1561 }
1562 }
1563
1564 if ((input_section->flags & SEC_CODE) != 0
1565 || (ELF32_R_TYPE (outrel.r_info) != R_VAX_32
1566 && ELF32_R_TYPE (outrel.r_info) != R_VAX_RELATIVE
1567 && ELF32_R_TYPE (outrel.r_info) != R_VAX_COPY
1568 && ELF32_R_TYPE (outrel.r_info) != R_VAX_JMP_SLOT
1569 && ELF32_R_TYPE (outrel.r_info) != R_VAX_GLOB_DAT))
1570 {
1571 if (h != NULL)
1572 _bfd_error_handler
1573 /* xgettext:c-format */
1574 (_("%B: warning: %s relocation against symbol `%s'"
1575 " from %A section"),
1576 input_bfd, howto->name, h->root.root.string,
1577 input_section);
1578 else
1579 _bfd_error_handler
1580 /* xgettext:c-format */
1581 (_("%B: warning: %s relocation to %#Lx from %A section"),
1582 input_bfd, howto->name, outrel.r_addend,
1583 input_section);
1584 }
1585 loc = sreloc->contents;
1586 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1587 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1588
1589 /* This reloc will be computed at runtime, so there's no
1590 need to do anything now, except for R_VAX_32
1591 relocations that have been turned into
1592 R_VAX_RELATIVE. */
1593 if (!relocate)
1594 continue;
1595 }
1596
1597 break;
1598
1599 case R_VAX_GNU_VTINHERIT:
1600 case R_VAX_GNU_VTENTRY:
1601 /* These are no-ops in the end. */
1602 continue;
1603
1604 default:
1605 break;
1606 }
1607
1608 /* VAX PCREL relocations are from the end of relocation, not the start.
1609 So subtract the difference from the relocation amount since we can't
1610 add it to the offset. */
1611 if (howto->pc_relative && howto->pcrel_offset)
1612 relocation -= bfd_get_reloc_size(howto);
1613
1614 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1615 contents, rel->r_offset,
1616 relocation, rel->r_addend);
1617
1618 if (r != bfd_reloc_ok)
1619 {
1620 switch (r)
1621 {
1622 default:
1623 case bfd_reloc_outofrange:
1624 abort ();
1625 case bfd_reloc_overflow:
1626 {
1627 const char *name;
1628
1629 if (h != NULL)
1630 name = NULL;
1631 else
1632 {
1633 name = bfd_elf_string_from_elf_section (input_bfd,
1634 symtab_hdr->sh_link,
1635 sym->st_name);
1636 if (name == NULL)
1637 return FALSE;
1638 if (*name == '\0')
1639 name = bfd_section_name (input_bfd, sec);
1640 }
1641 info->callbacks->reloc_overflow
1642 (info, (h ? &h->root : NULL), name, howto->name,
1643 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1644 }
1645 break;
1646 }
1647 }
1648 }
1649
1650 return TRUE;
1651 }
1652
1653 /* Finish up dynamic symbol handling. We set the contents of various
1654 dynamic sections here. */
1655
1656 static bfd_boolean
1657 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info,
1658 struct elf_link_hash_entry *h,
1659 Elf_Internal_Sym *sym)
1660 {
1661 bfd *dynobj;
1662
1663 dynobj = elf_hash_table (info)->dynobj;
1664
1665 if (h->plt.offset != (bfd_vma) -1)
1666 {
1667 asection *splt;
1668 asection *sgot;
1669 asection *srela;
1670 bfd_vma plt_index;
1671 bfd_vma got_offset;
1672 bfd_vma addend;
1673 Elf_Internal_Rela rela;
1674 bfd_byte *loc;
1675
1676 /* This symbol has an entry in the procedure linkage table. Set
1677 it up. */
1678 BFD_ASSERT (h->dynindx != -1);
1679
1680 splt = elf_hash_table (info)->splt;
1681 sgot = elf_hash_table (info)->sgotplt;
1682 srela = elf_hash_table (info)->srelplt;
1683 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1684
1685 addend = 2 * (h->plt.offset & 1);
1686 h->plt.offset &= ~1;
1687
1688 /* Get the index in the procedure linkage table which
1689 corresponds to this symbol. This is the index of this symbol
1690 in all the symbols for which we are making plt entries. The
1691 first entry in the procedure linkage table is reserved. */
1692 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1693
1694 /* Get the offset into the .got table of the entry that
1695 corresponds to this function. Each .got entry is 4 bytes.
1696 The first two are reserved. */
1697 got_offset = (plt_index + 3) * 4;
1698
1699 /* Fill in the entry in the procedure linkage table. */
1700 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry,
1701 PLT_ENTRY_SIZE);
1702
1703 /* The offset is relative to the first extension word. */
1704 bfd_put_32 (output_bfd,
1705 -(h->plt.offset + 8),
1706 splt->contents + h->plt.offset + 4);
1707
1708 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1709 splt->contents + h->plt.offset + 8);
1710
1711 /* Fill in the entry in the global offset table. */
1712 bfd_put_32 (output_bfd,
1713 (splt->output_section->vma
1714 + splt->output_offset
1715 + h->plt.offset) + addend,
1716 sgot->contents + got_offset);
1717
1718 /* Fill in the entry in the .rela.plt section. */
1719 rela.r_offset = (sgot->output_section->vma
1720 + sgot->output_offset
1721 + got_offset);
1722 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT);
1723 rela.r_addend = addend;
1724 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1725 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1726
1727 if (!h->def_regular)
1728 {
1729 /* Mark the symbol as undefined, rather than as defined in
1730 the .plt section. Leave the value alone. */
1731 sym->st_shndx = SHN_UNDEF;
1732 }
1733 }
1734
1735 if (h->got.offset != (bfd_vma) -1)
1736 {
1737 asection *sgot;
1738 asection *srela;
1739 Elf_Internal_Rela rela;
1740 bfd_byte *loc;
1741
1742 /* This symbol has an entry in the global offset table. Set it
1743 up. */
1744 sgot = elf_hash_table (info)->sgot;
1745 srela = elf_hash_table (info)->srelgot;
1746 BFD_ASSERT (sgot != NULL && srela != NULL);
1747
1748 rela.r_offset = (sgot->output_section->vma
1749 + sgot->output_offset
1750 + h->got.offset);
1751 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT);
1752 rela.r_addend = bfd_get_signed_32 (output_bfd,
1753 sgot->contents + h->got.offset);
1754
1755 loc = srela->contents;
1756 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1757 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1758 }
1759
1760 if (h->needs_copy)
1761 {
1762 asection *s;
1763 Elf_Internal_Rela rela;
1764 bfd_byte *loc;
1765
1766 /* This symbol needs a copy reloc. Set it up. */
1767 BFD_ASSERT (h->dynindx != -1
1768 && (h->root.type == bfd_link_hash_defined
1769 || h->root.type == bfd_link_hash_defweak));
1770
1771 s = bfd_get_linker_section (dynobj, ".rela.bss");
1772 BFD_ASSERT (s != NULL);
1773
1774 rela.r_offset = (h->root.u.def.value
1775 + h->root.u.def.section->output_section->vma
1776 + h->root.u.def.section->output_offset);
1777 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY);
1778 rela.r_addend = 0;
1779 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1780 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1781 }
1782
1783 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1784 if (h == elf_hash_table (info)->hdynamic
1785 || h == elf_hash_table (info)->hgot)
1786 sym->st_shndx = SHN_ABS;
1787
1788 return TRUE;
1789 }
1790
1791 /* Finish up the dynamic sections. */
1792
1793 static bfd_boolean
1794 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1795 {
1796 bfd *dynobj;
1797 asection *sgot;
1798 asection *sdyn;
1799
1800 dynobj = elf_hash_table (info)->dynobj;
1801
1802 sgot = elf_hash_table (info)->sgotplt;
1803 BFD_ASSERT (sgot != NULL);
1804 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
1805
1806 if (elf_hash_table (info)->dynamic_sections_created)
1807 {
1808 asection *splt;
1809 Elf32_External_Dyn *dyncon, *dynconend;
1810
1811 splt = elf_hash_table (info)->splt;
1812 BFD_ASSERT (splt != NULL && sdyn != NULL);
1813
1814 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1815 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
1816 for (; dyncon < dynconend; dyncon++)
1817 {
1818 Elf_Internal_Dyn dyn;
1819 asection *s;
1820
1821 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1822
1823 switch (dyn.d_tag)
1824 {
1825 default:
1826 break;
1827
1828 case DT_PLTGOT:
1829 s = elf_hash_table (info)->sgotplt;
1830 goto get_vma;
1831 case DT_JMPREL:
1832 s = elf_hash_table (info)->srelplt;
1833 get_vma:
1834 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
1835 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1836 break;
1837
1838 case DT_PLTRELSZ:
1839 s = elf_hash_table (info)->srelplt;
1840 dyn.d_un.d_val = s->size;
1841 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1842 break;
1843 }
1844 }
1845
1846 /* Fill in the first entry in the procedure linkage table. */
1847 if (splt->size > 0)
1848 {
1849 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE);
1850 bfd_put_32 (output_bfd,
1851 (sgot->output_section->vma
1852 + sgot->output_offset + 4
1853 - (splt->output_section->vma + 6)),
1854 splt->contents + 2);
1855 bfd_put_32 (output_bfd,
1856 (sgot->output_section->vma
1857 + sgot->output_offset + 8
1858 - (splt->output_section->vma + 12)),
1859 splt->contents + 8);
1860 elf_section_data (splt->output_section)->this_hdr.sh_entsize
1861 = PLT_ENTRY_SIZE;
1862 }
1863 }
1864
1865 /* Fill in the first three entries in the global offset table. */
1866 if (sgot->size > 0)
1867 {
1868 if (sdyn == NULL)
1869 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1870 else
1871 bfd_put_32 (output_bfd,
1872 sdyn->output_section->vma + sdyn->output_offset,
1873 sgot->contents);
1874 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1875 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1876 }
1877
1878 if (elf_section_data (sgot->output_section) != NULL)
1879 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1880
1881 return TRUE;
1882 }
1883
1884 static enum elf_reloc_type_class
1885 elf_vax_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
1886 const asection *rel_sec ATTRIBUTE_UNUSED,
1887 const Elf_Internal_Rela *rela)
1888 {
1889 switch ((int) ELF32_R_TYPE (rela->r_info))
1890 {
1891 case R_VAX_RELATIVE:
1892 return reloc_class_relative;
1893 case R_VAX_JMP_SLOT:
1894 return reloc_class_plt;
1895 case R_VAX_COPY:
1896 return reloc_class_copy;
1897 default:
1898 return reloc_class_normal;
1899 }
1900 }
1901
1902 static bfd_vma
1903 elf_vax_plt_sym_val (bfd_vma i, const asection *plt,
1904 const arelent *rel ATTRIBUTE_UNUSED)
1905 {
1906 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
1907 }
1908
1909 #define TARGET_LITTLE_SYM vax_elf32_vec
1910 #define TARGET_LITTLE_NAME "elf32-vax"
1911 #define ELF_MACHINE_CODE EM_VAX
1912 #define ELF_MAXPAGESIZE 0x1000
1913
1914 #define elf_backend_create_dynamic_sections \
1915 _bfd_elf_create_dynamic_sections
1916 #define bfd_elf32_bfd_link_hash_table_create \
1917 elf_vax_link_hash_table_create
1918 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
1919
1920 #define elf_backend_check_relocs elf_vax_check_relocs
1921 #define elf_backend_adjust_dynamic_symbol \
1922 elf_vax_adjust_dynamic_symbol
1923 #define elf_backend_always_size_sections \
1924 elf_vax_always_size_sections
1925 #define elf_backend_size_dynamic_sections \
1926 elf_vax_size_dynamic_sections
1927 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
1928 #define elf_backend_relocate_section elf_vax_relocate_section
1929 #define elf_backend_finish_dynamic_symbol \
1930 elf_vax_finish_dynamic_symbol
1931 #define elf_backend_finish_dynamic_sections \
1932 elf_vax_finish_dynamic_sections
1933 #define elf_backend_reloc_type_class elf_vax_reloc_type_class
1934 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook
1935 #define elf_backend_plt_sym_val elf_vax_plt_sym_val
1936 #define bfd_elf32_bfd_merge_private_bfd_data \
1937 elf32_vax_merge_private_bfd_data
1938 #define bfd_elf32_bfd_set_private_flags \
1939 elf32_vax_set_private_flags
1940 #define bfd_elf32_bfd_print_private_bfd_data \
1941 elf32_vax_print_private_bfd_data
1942
1943 #define elf_backend_can_gc_sections 1
1944 #define elf_backend_want_got_plt 1
1945 #define elf_backend_plt_readonly 1
1946 #define elf_backend_want_plt_sym 0
1947 #define elf_backend_got_header_size 16
1948 #define elf_backend_rela_normal 1
1949 #define elf_backend_dtrel_excludes_plt 1
1950
1951 #include "elf32-target.h"
GDB Binutils - Deliverables
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