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Update year range in copyright notice of binutils files
[deliverable/binutils-gdb.git] / bfd / elf32-vax.c
1 /* VAX series support for 32-bit ELF
2 Copyright (C) 1993-2018 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
593 switch (ELF32_R_TYPE (rel->r_info))
594 {
595 case R_VAX_GOT32:
596 BFD_ASSERT (h != NULL);
597
598 /* If this is a local symbol, we resolve it directly without
599 creating a global offset table entry. */
600 if (h->forced_local
601 || h == elf_hash_table (info)->hgot
602 || h == elf_hash_table (info)->hplt)
603 break;
604
605 /* This symbol requires a global offset table entry. */
606
607 if (dynobj == NULL)
608 {
609 /* Create the .got section. */
610 elf_hash_table (info)->dynobj = dynobj = abfd;
611 if (!_bfd_elf_create_got_section (dynobj, info))
612 return FALSE;
613 }
614
615 if (h != NULL)
616 {
617 struct elf_vax_link_hash_entry *eh;
618
619 eh = (struct elf_vax_link_hash_entry *) h;
620 if (h->got.refcount == -1)
621 {
622 h->got.refcount = 1;
623 eh->got_addend = rel->r_addend;
624 }
625 else
626 {
627 h->got.refcount++;
628 if (eh->got_addend != (bfd_vma) rel->r_addend)
629 _bfd_error_handler
630 /* xgettext:c-format */
631 (_("%B: warning: GOT addend of %Ld to `%s' does"
632 " not match previous GOT addend of %Ld"),
633 abfd, rel->r_addend, h->root.root.string,
634 eh->got_addend);
635
636 }
637 }
638 break;
639
640 case R_VAX_PLT32:
641 /* This symbol requires a procedure linkage table entry. We
642 actually build the entry in adjust_dynamic_symbol,
643 because this might be a case of linking PIC code which is
644 never referenced by a dynamic object, in which case we
645 don't need to generate a procedure linkage table entry
646 after all. */
647 BFD_ASSERT (h != NULL);
648
649 /* If this is a local symbol, we resolve it directly without
650 creating a procedure linkage table entry. */
651 if (h->forced_local)
652 break;
653
654 h->needs_plt = 1;
655 if (h->plt.refcount == -1)
656 h->plt.refcount = 1;
657 else
658 h->plt.refcount++;
659 break;
660
661 case R_VAX_PC8:
662 case R_VAX_PC16:
663 case R_VAX_PC32:
664 /* If we are creating a shared library and this is not a local
665 symbol, we need to copy the reloc into the shared library.
666 However when linking with -Bsymbolic and this is a global
667 symbol which is defined in an object we are including in the
668 link (i.e., DEF_REGULAR is set), then we can resolve the
669 reloc directly. At this point we have not seen all the input
670 files, so it is possible that DEF_REGULAR is not set now but
671 will be set later (it is never cleared). We account for that
672 possibility below by storing information in the
673 pcrel_relocs_copied field of the hash table entry. */
674 if (!(bfd_link_pic (info)
675 && (sec->flags & SEC_ALLOC) != 0
676 && h != NULL
677 && (!info->symbolic
678 || !h->def_regular)))
679 {
680 if (h != NULL
681 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
682 && !h->forced_local)
683 {
684 /* Make sure a plt entry is created for this symbol if
685 it turns out to be a function defined by a dynamic
686 object. */
687 if (h->plt.refcount == -1)
688 h->plt.refcount = 1;
689 else
690 h->plt.refcount++;
691 }
692 break;
693 }
694 /* If this is a local symbol, we can resolve it directly. */
695 if (h != NULL
696 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
697 || h->forced_local))
698 break;
699
700 /* Fall through. */
701 case R_VAX_8:
702 case R_VAX_16:
703 case R_VAX_32:
704 if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
705 {
706 /* Make sure a plt entry is created for this symbol if it
707 turns out to be a function defined by a dynamic object. */
708 if (h->plt.refcount == -1)
709 h->plt.refcount = 1;
710 else
711 h->plt.refcount++;
712 }
713
714 /* If we are creating a shared library, we need to copy the
715 reloc into the shared library. */
716 if (bfd_link_pic (info)
717 && (sec->flags & SEC_ALLOC) != 0)
718 {
719 /* When creating a shared object, we must copy these
720 reloc types into the output file. We create a reloc
721 section in dynobj and make room for this reloc. */
722 if (sreloc == NULL)
723 {
724 sreloc = _bfd_elf_make_dynamic_reloc_section
725 (sec, dynobj, 2, abfd, /*rela?*/ TRUE);
726
727 if (sreloc == NULL)
728 return FALSE;
729
730 if (sec->flags & SEC_READONLY)
731 info->flags |= DF_TEXTREL;
732 }
733
734 sreloc->size += sizeof (Elf32_External_Rela);
735
736 /* If we are linking with -Bsymbolic, we count the number of
737 PC relative relocations we have entered for this symbol,
738 so that we can discard them again if the symbol is later
739 defined by a regular object. Note that this function is
740 only called if we are using a vaxelf linker hash table,
741 which means that h is really a pointer to an
742 elf_vax_link_hash_entry. */
743 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8
744 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16
745 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32)
746 && info->symbolic)
747 {
748 struct elf_vax_link_hash_entry *eh;
749 struct elf_vax_pcrel_relocs_copied *p;
750
751 eh = (struct elf_vax_link_hash_entry *) h;
752
753 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
754 if (p->section == sreloc)
755 break;
756
757 if (p == NULL)
758 {
759 p = ((struct elf_vax_pcrel_relocs_copied *)
760 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
761 if (p == NULL)
762 return FALSE;
763 p->next = eh->pcrel_relocs_copied;
764 eh->pcrel_relocs_copied = p;
765 p->section = sreloc;
766 p->count = 0;
767 }
768
769 ++p->count;
770 }
771 }
772
773 break;
774
775 /* This relocation describes the C++ object vtable hierarchy.
776 Reconstruct it for later use during GC. */
777 case R_VAX_GNU_VTINHERIT:
778 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
779 return FALSE;
780 break;
781
782 /* This relocation describes which C++ vtable entries are actually
783 used. Record for later use during GC. */
784 case R_VAX_GNU_VTENTRY:
785 BFD_ASSERT (h != NULL);
786 if (h != NULL
787 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
788 return FALSE;
789 break;
790
791 default:
792 break;
793 }
794 }
795
796 return TRUE;
797 }
798
799 /* Return the section that should be marked against GC for a given
800 relocation. */
801
802 static asection *
803 elf_vax_gc_mark_hook (asection *sec,
804 struct bfd_link_info *info,
805 Elf_Internal_Rela *rel,
806 struct elf_link_hash_entry *h,
807 Elf_Internal_Sym *sym)
808 {
809 if (h != NULL)
810 switch (ELF32_R_TYPE (rel->r_info))
811 {
812 case R_VAX_GNU_VTINHERIT:
813 case R_VAX_GNU_VTENTRY:
814 return NULL;
815 }
816
817 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
818 }
819
820 /* Adjust a symbol defined by a dynamic object and referenced by a
821 regular object. The current definition is in some section of the
822 dynamic object, but we're not including those sections. We have to
823 change the definition to something the rest of the link can
824 understand. */
825
826 static bfd_boolean
827 elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info,
828 struct elf_link_hash_entry *h)
829 {
830 bfd *dynobj;
831 asection *s;
832
833 dynobj = elf_hash_table (info)->dynobj;
834
835 /* Make sure we know what is going on here. */
836 BFD_ASSERT (dynobj != NULL
837 && (h->needs_plt
838 || h->is_weakalias
839 || (h->def_dynamic
840 && h->ref_regular
841 && !h->def_regular)));
842
843 /* If this is a function, put it in the procedure linkage table. We
844 will fill in the contents of the procedure linkage table later,
845 when we know the address of the .got section. */
846 if (h->type == STT_FUNC
847 || h->needs_plt)
848 {
849 if (h->plt.refcount <= 0
850 || SYMBOL_CALLS_LOCAL (info, h)
851 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
852 && h->root.type == bfd_link_hash_undefweak))
853 {
854 /* This case can occur if we saw a PLTxx reloc in an input
855 file, but the symbol was never referred to by a dynamic
856 object, or if all references were garbage collected. In
857 such a case, we don't actually need to build a procedure
858 linkage table, and we can just do a PCxx reloc instead. */
859 h->plt.offset = (bfd_vma) -1;
860 h->needs_plt = 0;
861 return TRUE;
862 }
863
864 s = elf_hash_table (info)->splt;
865 BFD_ASSERT (s != NULL);
866
867 /* If this is the first .plt entry, make room for the special
868 first entry. */
869 if (s->size == 0)
870 {
871 s->size += PLT_ENTRY_SIZE;
872 }
873
874 /* If this symbol is not defined in a regular file, and we are
875 not generating a shared library, then set the symbol to this
876 location in the .plt. This is required to make function
877 pointers compare as equal between the normal executable and
878 the shared library. */
879 if (!bfd_link_pic (info)
880 && !h->def_regular)
881 {
882 h->root.u.def.section = s;
883 h->root.u.def.value = s->size;
884 }
885
886 h->plt.offset = s->size;
887
888 /* Make room for this entry. */
889 s->size += PLT_ENTRY_SIZE;
890
891 /* We also need to make an entry in the .got.plt section, which
892 will be placed in the .got section by the linker script. */
893
894 s = elf_hash_table (info)->sgotplt;
895 BFD_ASSERT (s != NULL);
896 s->size += 4;
897
898 /* We also need to make an entry in the .rela.plt section. */
899
900 s = elf_hash_table (info)->srelplt;
901 BFD_ASSERT (s != NULL);
902 s->size += sizeof (Elf32_External_Rela);
903
904 return TRUE;
905 }
906
907 /* Reinitialize the plt offset now that it is not used as a reference
908 count any more. */
909 h->plt.offset = (bfd_vma) -1;
910
911 /* If this is a weak symbol, and there is a real definition, the
912 processor independent code will have arranged for us to see the
913 real definition first, and we can just use the same value. */
914 if (h->is_weakalias)
915 {
916 struct elf_link_hash_entry *def = weakdef (h);
917 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
918 h->root.u.def.section = def->root.u.def.section;
919 h->root.u.def.value = def->root.u.def.value;
920 return TRUE;
921 }
922
923 /* This is a reference to a symbol defined by a dynamic object which
924 is not a function. */
925
926 /* If we are creating a shared library, we must presume that the
927 only references to the symbol are via the global offset table.
928 For such cases we need not do anything here; the relocations will
929 be handled correctly by relocate_section. */
930 if (bfd_link_pic (info))
931 return TRUE;
932
933 /* We must allocate the symbol in our .dynbss section, which will
934 become part of the .bss section of the executable. There will be
935 an entry for this symbol in the .dynsym section. The dynamic
936 object will contain position independent code, so all references
937 from the dynamic object to this symbol will go through the global
938 offset table. The dynamic linker will use the .dynsym entry to
939 determine the address it must put in the global offset table, so
940 both the dynamic object and the regular object will refer to the
941 same memory location for the variable. */
942
943 s = bfd_get_linker_section (dynobj, ".dynbss");
944 BFD_ASSERT (s != NULL);
945
946 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to
947 copy the initial value out of the dynamic object and into the
948 runtime process image. We need to remember the offset into the
949 .rela.bss section we are going to use. */
950 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
951 {
952 asection *srel;
953
954 srel = bfd_get_linker_section (dynobj, ".rela.bss");
955 BFD_ASSERT (srel != NULL);
956 srel->size += sizeof (Elf32_External_Rela);
957 h->needs_copy = 1;
958 }
959
960 return _bfd_elf_adjust_dynamic_copy (info, h, s);
961 }
962
963 /* This function is called via elf_link_hash_traverse. It resets GOT
964 and PLT (.GOT) reference counts back to -1 so normal PC32 relocation
965 will be done. */
966
967 static bfd_boolean
968 elf_vax_discard_got_entries (struct elf_link_hash_entry *h,
969 void *infoptr ATTRIBUTE_UNUSED)
970 {
971 h->got.refcount = -1;
972 h->plt.refcount = -1;
973
974 return TRUE;
975 }
976
977 /* Discard unused dynamic data if this is a static link. */
978
979 static bfd_boolean
980 elf_vax_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
981 struct bfd_link_info *info)
982 {
983 bfd *dynobj;
984 asection *s;
985
986 dynobj = elf_hash_table (info)->dynobj;
987
988 if (dynobj && !elf_hash_table (info)->dynamic_sections_created)
989 {
990 /* We may have created entries in the .rela.got and .got sections.
991 However, if we are not creating the dynamic sections, we will
992 not actually use these entries. Reset the size of .rela.got
993 and .got, which will cause them to get stripped from the output
994 file below. */
995 s = elf_hash_table (info)->srelgot;
996 if (s != NULL)
997 s->size = 0;
998 s = elf_hash_table (info)->sgotplt;
999 if (s != NULL)
1000 s->size = 0;
1001 s = elf_hash_table (info)->sgot;
1002 if (s != NULL)
1003 s->size = 0;
1004 }
1005
1006 /* If this is a static link, we need to discard all the got entries we've
1007 recorded. */
1008 if (!dynobj || !elf_hash_table (info)->dynamic_sections_created)
1009 elf_link_hash_traverse (elf_hash_table (info),
1010 elf_vax_discard_got_entries,
1011 info);
1012
1013 return TRUE;
1014 }
1015
1016 /* Set the sizes of the dynamic sections. */
1017
1018 static bfd_boolean
1019 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1020 {
1021 bfd *dynobj;
1022 asection *s;
1023 bfd_boolean plt;
1024 bfd_boolean relocs;
1025 bfd_boolean reltext;
1026
1027 dynobj = elf_hash_table (info)->dynobj;
1028 BFD_ASSERT (dynobj != NULL);
1029
1030 if (elf_hash_table (info)->dynamic_sections_created)
1031 {
1032 /* Set the contents of the .interp section to the interpreter. */
1033 if (bfd_link_executable (info) && !info->nointerp)
1034 {
1035 s = bfd_get_linker_section (dynobj, ".interp");
1036 BFD_ASSERT (s != NULL);
1037 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1038 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1039 }
1040 }
1041
1042 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1043 relative relocs against symbols defined in a regular object. We
1044 allocated space for them in the check_relocs routine, but we will not
1045 fill them in in the relocate_section routine. */
1046 if (bfd_link_pic (info) && info->symbolic)
1047 elf_vax_link_hash_traverse (elf_hash_table (info),
1048 elf_vax_discard_copies,
1049 NULL);
1050
1051 /* If this is a -Bsymbolic shared link, we need to discard all the got
1052 entries we've recorded. Otherwise, we need to instantiate (allocate
1053 space for them). */
1054 elf_link_hash_traverse (elf_hash_table (info),
1055 elf_vax_instantiate_got_entries,
1056 info);
1057
1058 /* The check_relocs and adjust_dynamic_symbol entry points have
1059 determined the sizes of the various dynamic sections. Allocate
1060 memory for them. */
1061 plt = FALSE;
1062 relocs = FALSE;
1063 reltext = FALSE;
1064 for (s = dynobj->sections; s != NULL; s = s->next)
1065 {
1066 const char *name;
1067
1068 if ((s->flags & SEC_LINKER_CREATED) == 0)
1069 continue;
1070
1071 /* It's OK to base decisions on the section name, because none
1072 of the dynobj section names depend upon the input files. */
1073 name = bfd_get_section_name (dynobj, s);
1074
1075 if (strcmp (name, ".plt") == 0)
1076 {
1077 /* Remember whether there is a PLT. */
1078 plt = s->size != 0;
1079 }
1080 else if (CONST_STRNEQ (name, ".rela"))
1081 {
1082 if (s->size != 0)
1083 {
1084 asection *target;
1085
1086 /* Remember whether there are any reloc sections other
1087 than .rela.plt. */
1088 if (strcmp (name, ".rela.plt") != 0)
1089 {
1090 const char *outname;
1091
1092 relocs = TRUE;
1093
1094 /* If this relocation section applies to a read only
1095 section, then we probably need a DT_TEXTREL
1096 entry. .rela.plt is actually associated with
1097 .got.plt, which is never readonly. */
1098 outname = bfd_get_section_name (output_bfd,
1099 s->output_section);
1100 target = bfd_get_section_by_name (output_bfd, outname + 5);
1101 if (target != NULL
1102 && (target->flags & SEC_READONLY) != 0
1103 && (target->flags & SEC_ALLOC) != 0)
1104 reltext = TRUE;
1105 }
1106
1107 /* We use the reloc_count field as a counter if we need
1108 to copy relocs into the output file. */
1109 s->reloc_count = 0;
1110 }
1111 }
1112 else if (! CONST_STRNEQ (name, ".got")
1113 && strcmp (name, ".dynbss") != 0)
1114 {
1115 /* It's not one of our sections, so don't allocate space. */
1116 continue;
1117 }
1118
1119 if (s->size == 0)
1120 {
1121 /* If we don't need this section, strip it from the
1122 output file. This is mostly to handle .rela.bss and
1123 .rela.plt. We must create both sections in
1124 create_dynamic_sections, because they must be created
1125 before the linker maps input sections to output
1126 sections. The linker does that before
1127 adjust_dynamic_symbol is called, and it is that
1128 function which decides whether anything needs to go
1129 into these sections. */
1130 s->flags |= SEC_EXCLUDE;
1131 continue;
1132 }
1133
1134 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1135 continue;
1136
1137 /* Allocate memory for the section contents. */
1138 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1139 if (s->contents == NULL)
1140 return FALSE;
1141 }
1142
1143 if (elf_hash_table (info)->dynamic_sections_created)
1144 {
1145 /* Add some entries to the .dynamic section. We fill in the
1146 values later, in elf_vax_finish_dynamic_sections, but we
1147 must add the entries now so that we get the correct size for
1148 the .dynamic section. The DT_DEBUG entry is filled in by the
1149 dynamic linker and used by the debugger. */
1150 #define add_dynamic_entry(TAG, VAL) \
1151 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1152
1153 if (!bfd_link_pic (info))
1154 {
1155 if (!add_dynamic_entry (DT_DEBUG, 0))
1156 return FALSE;
1157 }
1158
1159 if (plt)
1160 {
1161 if (!add_dynamic_entry (DT_PLTGOT, 0)
1162 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1163 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1164 || !add_dynamic_entry (DT_JMPREL, 0))
1165 return FALSE;
1166 }
1167
1168 if (relocs)
1169 {
1170 if (!add_dynamic_entry (DT_RELA, 0)
1171 || !add_dynamic_entry (DT_RELASZ, 0)
1172 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1173 return FALSE;
1174 }
1175
1176 if (reltext || (info->flags & DF_TEXTREL) != 0)
1177 {
1178 if (!add_dynamic_entry (DT_TEXTREL, 0))
1179 return FALSE;
1180 }
1181 }
1182 #undef add_dynamic_entry
1183
1184 return TRUE;
1185 }
1186
1187 /* This function is called via elf_vax_link_hash_traverse if we are
1188 creating a shared object with -Bsymbolic. It discards the space
1189 allocated to copy PC relative relocs against symbols which are defined
1190 in regular objects. We allocated space for them in the check_relocs
1191 routine, but we won't fill them in in the relocate_section routine. */
1192
1193 static bfd_boolean
1194 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h,
1195 void * ignore ATTRIBUTE_UNUSED)
1196 {
1197 struct elf_vax_pcrel_relocs_copied *s;
1198
1199 /* We only discard relocs for symbols defined in a regular object. */
1200 if (!h->root.def_regular)
1201 return TRUE;
1202
1203 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1204 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1205
1206 return TRUE;
1207 }
1208
1209 /* This function is called via elf_link_hash_traverse. It looks for
1210 entries that have GOT or PLT (.GOT) references. If creating a shared
1211 object with -Bsymbolic, or the symbol has been forced local, then it
1212 resets the reference count back to -1 so normal PC32 relocation will
1213 be done. Otherwise space in the .got and .rela.got will be reserved
1214 for the symbol. */
1215
1216 static bfd_boolean
1217 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, void * infoptr)
1218 {
1219 struct bfd_link_info *info = (struct bfd_link_info *) infoptr;
1220 bfd *dynobj;
1221 asection *sgot;
1222 asection *srelgot;
1223
1224 /* We don't care about non-GOT (and non-PLT) entries. */
1225 if (h->got.refcount <= 0 && h->plt.refcount <= 0)
1226 return TRUE;
1227
1228 dynobj = elf_hash_table (info)->dynobj;
1229 BFD_ASSERT (dynobj != NULL);
1230
1231 sgot = elf_hash_table (info)->sgot;
1232 srelgot = elf_hash_table (info)->srelgot;
1233
1234 if (SYMBOL_REFERENCES_LOCAL (info, h))
1235 {
1236 h->got.refcount = -1;
1237 h->plt.refcount = -1;
1238 }
1239 else if (h->got.refcount > 0)
1240 {
1241 /* Make sure this symbol is output as a dynamic symbol. */
1242 if (h->dynindx == -1)
1243 {
1244 if (!bfd_elf_link_record_dynamic_symbol (info, h))
1245 return FALSE;
1246 }
1247
1248 /* Allocate space in the .got and .rela.got sections. */
1249 sgot->size += 4;
1250 srelgot->size += sizeof (Elf32_External_Rela);
1251 }
1252
1253 return TRUE;
1254 }
1255
1256 /* Relocate an VAX ELF section. */
1257
1258 static bfd_boolean
1259 elf_vax_relocate_section (bfd *output_bfd,
1260 struct bfd_link_info *info,
1261 bfd *input_bfd,
1262 asection *input_section,
1263 bfd_byte *contents,
1264 Elf_Internal_Rela *relocs,
1265 Elf_Internal_Sym *local_syms,
1266 asection **local_sections)
1267 {
1268 Elf_Internal_Shdr *symtab_hdr;
1269 struct elf_link_hash_entry **sym_hashes;
1270 bfd_vma plt_index;
1271 bfd_vma got_offset;
1272 asection *sgot;
1273 asection *splt;
1274 asection *sgotplt;
1275 asection *sreloc;
1276 Elf_Internal_Rela *rel;
1277 Elf_Internal_Rela *relend;
1278
1279 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1280 sym_hashes = elf_sym_hashes (input_bfd);
1281
1282 sgot = NULL;
1283 splt = NULL;
1284 sgotplt = NULL;
1285 sreloc = NULL;
1286
1287 rel = relocs;
1288 relend = relocs + input_section->reloc_count;
1289 for (; rel < relend; rel++)
1290 {
1291 int r_type;
1292 reloc_howto_type *howto;
1293 unsigned long r_symndx;
1294 struct elf_link_hash_entry *h;
1295 Elf_Internal_Sym *sym;
1296 asection *sec;
1297 bfd_vma relocation;
1298 bfd_reloc_status_type r;
1299
1300 r_type = ELF32_R_TYPE (rel->r_info);
1301 if (r_type < 0 || r_type >= (int) R_VAX_max)
1302 {
1303 bfd_set_error (bfd_error_bad_value);
1304 return FALSE;
1305 }
1306 howto = howto_table + r_type;
1307
1308 r_symndx = ELF32_R_SYM (rel->r_info);
1309 h = NULL;
1310 sym = NULL;
1311 sec = NULL;
1312 if (r_symndx < symtab_hdr->sh_info)
1313 {
1314 sym = local_syms + r_symndx;
1315 sec = local_sections[r_symndx];
1316 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1317 }
1318 else
1319 {
1320 bfd_boolean unresolved_reloc;
1321 bfd_boolean warned, ignored;
1322
1323 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1324 r_symndx, symtab_hdr, sym_hashes,
1325 h, sec, relocation,
1326 unresolved_reloc, warned, ignored);
1327
1328 if ((h->root.type == bfd_link_hash_defined
1329 || h->root.type == bfd_link_hash_defweak)
1330 && ((r_type == R_VAX_PLT32
1331 && h->plt.offset != (bfd_vma) -1
1332 && !h->forced_local
1333 && elf_hash_table (info)->dynamic_sections_created)
1334 || (r_type == R_VAX_GOT32
1335 && h->got.offset != (bfd_vma) -1
1336 && !h->forced_local
1337 && elf_hash_table (info)->dynamic_sections_created
1338 && (! bfd_link_pic (info)
1339 || (! info->symbolic && h->dynindx != -1)
1340 || !h->def_regular))
1341 || (bfd_link_pic (info)
1342 && ((! info->symbolic && h->dynindx != -1)
1343 || !h->def_regular)
1344 && ((input_section->flags & SEC_ALLOC) != 0
1345 /* DWARF will emit R_VAX_32 relocations in its
1346 sections against symbols defined externally
1347 in shared libraries. We can't do anything
1348 with them here. */
1349
1350 || ((input_section->flags & SEC_DEBUGGING) != 0
1351 && h->def_dynamic))
1352 && (r_type == R_VAX_8
1353 || r_type == R_VAX_16
1354 || r_type == R_VAX_32))))
1355 /* In these cases, we don't need the relocation
1356 value. We check specially because in some
1357 obscure cases sec->output_section will be NULL. */
1358 relocation = 0;
1359 }
1360
1361 if (sec != NULL && discarded_section (sec))
1362 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1363 rel, 1, relend, howto, 0, contents);
1364
1365 if (bfd_link_relocatable (info))
1366 continue;
1367
1368 switch (r_type)
1369 {
1370 case R_VAX_GOT32:
1371 /* Relocation is to the address of the entry for this symbol
1372 in the global offset table. */
1373
1374 /* Resolve a GOTxx reloc against a local symbol directly,
1375 without using the global offset table. */
1376 if (h == NULL
1377 || h->got.offset == (bfd_vma) -1)
1378 break;
1379
1380 {
1381 bfd_vma off;
1382
1383 sgot = elf_hash_table (info)->sgot;
1384 BFD_ASSERT (sgot != NULL);
1385
1386 off = h->got.offset;
1387 BFD_ASSERT (off < sgot->size);
1388
1389 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off);
1390
1391 relocation = sgot->output_offset + off;
1392 /* The GOT relocation uses the addend. */
1393 rel->r_addend = 0;
1394
1395 /* Change the reference to be indirect. */
1396 contents[rel->r_offset - 1] |= 0x10;
1397 relocation += sgot->output_section->vma;
1398 }
1399 break;
1400
1401 case R_VAX_PC32:
1402 /* If we are creating an executable and the function this
1403 reloc refers to is in a shared lib, then we made a PLT
1404 entry for this symbol and need to handle the reloc like
1405 a PLT reloc. */
1406 if (bfd_link_pic (info))
1407 goto r_vax_pc32_shared;
1408 /* Fall through. */
1409 case R_VAX_PLT32:
1410 /* Relocation is to the entry for this symbol in the
1411 procedure linkage table. */
1412
1413 /* Resolve a PLTxx reloc against a local symbol directly,
1414 without using the procedure linkage table. */
1415 if (h == NULL
1416 || h->plt.offset == (bfd_vma) -1)
1417 break;
1418
1419 splt = elf_hash_table (info)->splt;
1420 BFD_ASSERT (splt != NULL);
1421
1422 sgotplt = elf_hash_table (info)->sgotplt;
1423 BFD_ASSERT (sgotplt != NULL);
1424
1425 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1426
1427 /* Get the offset into the .got table of the entry that
1428 corresponds to this function. Each .got entry is 4 bytes.
1429 The first two are reserved. */
1430 got_offset = (plt_index + 3) * 4;
1431
1432 /* We want the relocation to point into the .got.plt instead
1433 of the plt itself. */
1434 relocation = (sgotplt->output_section->vma
1435 + sgotplt->output_offset
1436 + got_offset);
1437 contents[rel->r_offset-1] |= 0x10; /* make indirect */
1438 if (rel->r_addend == 2)
1439 {
1440 h->plt.offset |= 1;
1441 }
1442 else if (rel->r_addend != 0)
1443 _bfd_error_handler
1444 /* xgettext:c-format */
1445 (_("%B: warning: PLT addend of %Ld to `%s'"
1446 " from %A section ignored"),
1447 input_bfd, rel->r_addend, h->root.root.string, input_section);
1448 rel->r_addend = 0;
1449
1450 break;
1451
1452 case R_VAX_PC8:
1453 case R_VAX_PC16:
1454 r_vax_pc32_shared:
1455 if (h == NULL
1456 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1457 || h->forced_local)
1458 break;
1459 /* Fall through. */
1460 case R_VAX_8:
1461 case R_VAX_16:
1462 case R_VAX_32:
1463 if (bfd_link_pic (info)
1464 && r_symndx != STN_UNDEF
1465 && (input_section->flags & SEC_ALLOC) != 0
1466 && ((r_type != R_VAX_PC8
1467 && r_type != R_VAX_PC16
1468 && r_type != R_VAX_PC32)
1469 || ((input_section->flags & SEC_CODE)
1470 && (!info->symbolic
1471 || (!h->def_regular && h->type != STT_SECTION)))))
1472 {
1473 Elf_Internal_Rela outrel;
1474 bfd_byte *loc;
1475 bfd_boolean skip, relocate;
1476
1477 /* When generating a shared object, these relocations
1478 are copied into the output file to be resolved at run
1479 time. */
1480 if (sreloc == NULL)
1481 {
1482 sreloc = _bfd_elf_get_dynamic_reloc_section
1483 (input_bfd, input_section, /*rela?*/ TRUE);
1484 if (sreloc == NULL)
1485 return FALSE;
1486 }
1487
1488 skip = FALSE;
1489 relocate = FALSE;
1490
1491 outrel.r_offset =
1492 _bfd_elf_section_offset (output_bfd, info, input_section,
1493 rel->r_offset);
1494 if (outrel.r_offset == (bfd_vma) -1)
1495 skip = TRUE;
1496 if (outrel.r_offset == (bfd_vma) -2)
1497 skip = TRUE, relocate = TRUE;
1498 outrel.r_offset += (input_section->output_section->vma
1499 + input_section->output_offset);
1500
1501 if (skip)
1502 memset (&outrel, 0, sizeof outrel);
1503 /* h->dynindx may be -1 if the symbol was marked to
1504 become local. */
1505 else if (h != NULL
1506 && ((! info->symbolic && h->dynindx != -1)
1507 || !h->def_regular))
1508 {
1509 BFD_ASSERT (h->dynindx != -1);
1510 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1511 outrel.r_addend = relocation + rel->r_addend;
1512 }
1513 else
1514 {
1515 if (r_type == R_VAX_32)
1516 {
1517 relocate = TRUE;
1518 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE);
1519 BFD_ASSERT (bfd_get_signed_32 (input_bfd,
1520 &contents[rel->r_offset]) == 0);
1521 outrel.r_addend = relocation + rel->r_addend;
1522 }
1523 else
1524 {
1525 long indx;
1526
1527 if (bfd_is_abs_section (sec))
1528 indx = 0;
1529 else if (sec == NULL || sec->owner == NULL)
1530 {
1531 bfd_set_error (bfd_error_bad_value);
1532 return FALSE;
1533 }
1534 else
1535 {
1536 asection *osec;
1537
1538 /* We are turning this relocation into one
1539 against a section symbol. It would be
1540 proper to subtract the symbol's value,
1541 osec->vma, from the emitted reloc addend,
1542 but ld.so expects buggy relocs. */
1543 osec = sec->output_section;
1544 indx = elf_section_data (osec)->dynindx;
1545 if (indx == 0)
1546 {
1547 struct elf_link_hash_table *htab;
1548 htab = elf_hash_table (info);
1549 osec = htab->text_index_section;
1550 indx = elf_section_data (osec)->dynindx;
1551 }
1552 BFD_ASSERT (indx != 0);
1553 }
1554
1555 outrel.r_info = ELF32_R_INFO (indx, r_type);
1556 outrel.r_addend = relocation + rel->r_addend;
1557 }
1558 }
1559
1560 if ((input_section->flags & SEC_CODE) != 0
1561 || (ELF32_R_TYPE (outrel.r_info) != R_VAX_32
1562 && ELF32_R_TYPE (outrel.r_info) != R_VAX_RELATIVE
1563 && ELF32_R_TYPE (outrel.r_info) != R_VAX_COPY
1564 && ELF32_R_TYPE (outrel.r_info) != R_VAX_JMP_SLOT
1565 && ELF32_R_TYPE (outrel.r_info) != R_VAX_GLOB_DAT))
1566 {
1567 if (h != NULL)
1568 _bfd_error_handler
1569 /* xgettext:c-format */
1570 (_("%B: warning: %s relocation against symbol `%s'"
1571 " from %A section"),
1572 input_bfd, howto->name, h->root.root.string,
1573 input_section);
1574 else
1575 _bfd_error_handler
1576 /* xgettext:c-format */
1577 (_("%B: warning: %s relocation to %#Lx from %A section"),
1578 input_bfd, howto->name, outrel.r_addend,
1579 input_section);
1580 }
1581 loc = sreloc->contents;
1582 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1583 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1584
1585 /* This reloc will be computed at runtime, so there's no
1586 need to do anything now, except for R_VAX_32
1587 relocations that have been turned into
1588 R_VAX_RELATIVE. */
1589 if (!relocate)
1590 continue;
1591 }
1592
1593 break;
1594
1595 case R_VAX_GNU_VTINHERIT:
1596 case R_VAX_GNU_VTENTRY:
1597 /* These are no-ops in the end. */
1598 continue;
1599
1600 default:
1601 break;
1602 }
1603
1604 /* VAX PCREL relocations are from the end of relocation, not the start.
1605 So subtract the difference from the relocation amount since we can't
1606 add it to the offset. */
1607 if (howto->pc_relative && howto->pcrel_offset)
1608 relocation -= bfd_get_reloc_size(howto);
1609
1610 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1611 contents, rel->r_offset,
1612 relocation, rel->r_addend);
1613
1614 if (r != bfd_reloc_ok)
1615 {
1616 switch (r)
1617 {
1618 default:
1619 case bfd_reloc_outofrange:
1620 abort ();
1621 case bfd_reloc_overflow:
1622 {
1623 const char *name;
1624
1625 if (h != NULL)
1626 name = NULL;
1627 else
1628 {
1629 name = bfd_elf_string_from_elf_section (input_bfd,
1630 symtab_hdr->sh_link,
1631 sym->st_name);
1632 if (name == NULL)
1633 return FALSE;
1634 if (*name == '\0')
1635 name = bfd_section_name (input_bfd, sec);
1636 }
1637 info->callbacks->reloc_overflow
1638 (info, (h ? &h->root : NULL), name, howto->name,
1639 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1640 }
1641 break;
1642 }
1643 }
1644 }
1645
1646 return TRUE;
1647 }
1648
1649 /* Finish up dynamic symbol handling. We set the contents of various
1650 dynamic sections here. */
1651
1652 static bfd_boolean
1653 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info,
1654 struct elf_link_hash_entry *h,
1655 Elf_Internal_Sym *sym)
1656 {
1657 bfd *dynobj;
1658
1659 dynobj = elf_hash_table (info)->dynobj;
1660
1661 if (h->plt.offset != (bfd_vma) -1)
1662 {
1663 asection *splt;
1664 asection *sgot;
1665 asection *srela;
1666 bfd_vma plt_index;
1667 bfd_vma got_offset;
1668 bfd_vma addend;
1669 Elf_Internal_Rela rela;
1670 bfd_byte *loc;
1671
1672 /* This symbol has an entry in the procedure linkage table. Set
1673 it up. */
1674 BFD_ASSERT (h->dynindx != -1);
1675
1676 splt = elf_hash_table (info)->splt;
1677 sgot = elf_hash_table (info)->sgotplt;
1678 srela = elf_hash_table (info)->srelplt;
1679 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1680
1681 addend = 2 * (h->plt.offset & 1);
1682 h->plt.offset &= ~1;
1683
1684 /* Get the index in the procedure linkage table which
1685 corresponds to this symbol. This is the index of this symbol
1686 in all the symbols for which we are making plt entries. The
1687 first entry in the procedure linkage table is reserved. */
1688 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1689
1690 /* Get the offset into the .got table of the entry that
1691 corresponds to this function. Each .got entry is 4 bytes.
1692 The first two are reserved. */
1693 got_offset = (plt_index + 3) * 4;
1694
1695 /* Fill in the entry in the procedure linkage table. */
1696 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry,
1697 PLT_ENTRY_SIZE);
1698
1699 /* The offset is relative to the first extension word. */
1700 bfd_put_32 (output_bfd,
1701 -(h->plt.offset + 8),
1702 splt->contents + h->plt.offset + 4);
1703
1704 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1705 splt->contents + h->plt.offset + 8);
1706
1707 /* Fill in the entry in the global offset table. */
1708 bfd_put_32 (output_bfd,
1709 (splt->output_section->vma
1710 + splt->output_offset
1711 + h->plt.offset) + addend,
1712 sgot->contents + got_offset);
1713
1714 /* Fill in the entry in the .rela.plt section. */
1715 rela.r_offset = (sgot->output_section->vma
1716 + sgot->output_offset
1717 + got_offset);
1718 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT);
1719 rela.r_addend = addend;
1720 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1721 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1722
1723 if (!h->def_regular)
1724 {
1725 /* Mark the symbol as undefined, rather than as defined in
1726 the .plt section. Leave the value alone. */
1727 sym->st_shndx = SHN_UNDEF;
1728 }
1729 }
1730
1731 if (h->got.offset != (bfd_vma) -1)
1732 {
1733 asection *sgot;
1734 asection *srela;
1735 Elf_Internal_Rela rela;
1736 bfd_byte *loc;
1737
1738 /* This symbol has an entry in the global offset table. Set it
1739 up. */
1740 sgot = elf_hash_table (info)->sgot;
1741 srela = elf_hash_table (info)->srelgot;
1742 BFD_ASSERT (sgot != NULL && srela != NULL);
1743
1744 rela.r_offset = (sgot->output_section->vma
1745 + sgot->output_offset
1746 + h->got.offset);
1747 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT);
1748 rela.r_addend = bfd_get_signed_32 (output_bfd,
1749 sgot->contents + h->got.offset);
1750
1751 loc = srela->contents;
1752 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1753 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1754 }
1755
1756 if (h->needs_copy)
1757 {
1758 asection *s;
1759 Elf_Internal_Rela rela;
1760 bfd_byte *loc;
1761
1762 /* This symbol needs a copy reloc. Set it up. */
1763 BFD_ASSERT (h->dynindx != -1
1764 && (h->root.type == bfd_link_hash_defined
1765 || h->root.type == bfd_link_hash_defweak));
1766
1767 s = bfd_get_linker_section (dynobj, ".rela.bss");
1768 BFD_ASSERT (s != NULL);
1769
1770 rela.r_offset = (h->root.u.def.value
1771 + h->root.u.def.section->output_section->vma
1772 + h->root.u.def.section->output_offset);
1773 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY);
1774 rela.r_addend = 0;
1775 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1776 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1777 }
1778
1779 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1780 if (h == elf_hash_table (info)->hdynamic
1781 || h == elf_hash_table (info)->hgot)
1782 sym->st_shndx = SHN_ABS;
1783
1784 return TRUE;
1785 }
1786
1787 /* Finish up the dynamic sections. */
1788
1789 static bfd_boolean
1790 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1791 {
1792 bfd *dynobj;
1793 asection *sgot;
1794 asection *sdyn;
1795
1796 dynobj = elf_hash_table (info)->dynobj;
1797
1798 sgot = elf_hash_table (info)->sgotplt;
1799 BFD_ASSERT (sgot != NULL);
1800 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
1801
1802 if (elf_hash_table (info)->dynamic_sections_created)
1803 {
1804 asection *splt;
1805 Elf32_External_Dyn *dyncon, *dynconend;
1806
1807 splt = elf_hash_table (info)->splt;
1808 BFD_ASSERT (splt != NULL && sdyn != NULL);
1809
1810 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1811 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
1812 for (; dyncon < dynconend; dyncon++)
1813 {
1814 Elf_Internal_Dyn dyn;
1815 asection *s;
1816
1817 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1818
1819 switch (dyn.d_tag)
1820 {
1821 default:
1822 break;
1823
1824 case DT_PLTGOT:
1825 s = elf_hash_table (info)->sgotplt;
1826 goto get_vma;
1827 case DT_JMPREL:
1828 s = elf_hash_table (info)->srelplt;
1829 get_vma:
1830 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
1831 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1832 break;
1833
1834 case DT_PLTRELSZ:
1835 s = elf_hash_table (info)->srelplt;
1836 dyn.d_un.d_val = s->size;
1837 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1838 break;
1839 }
1840 }
1841
1842 /* Fill in the first entry in the procedure linkage table. */
1843 if (splt->size > 0)
1844 {
1845 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE);
1846 bfd_put_32 (output_bfd,
1847 (sgot->output_section->vma
1848 + sgot->output_offset + 4
1849 - (splt->output_section->vma + 6)),
1850 splt->contents + 2);
1851 bfd_put_32 (output_bfd,
1852 (sgot->output_section->vma
1853 + sgot->output_offset + 8
1854 - (splt->output_section->vma + 12)),
1855 splt->contents + 8);
1856 elf_section_data (splt->output_section)->this_hdr.sh_entsize
1857 = PLT_ENTRY_SIZE;
1858 }
1859 }
1860
1861 /* Fill in the first three entries in the global offset table. */
1862 if (sgot->size > 0)
1863 {
1864 if (sdyn == NULL)
1865 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1866 else
1867 bfd_put_32 (output_bfd,
1868 sdyn->output_section->vma + sdyn->output_offset,
1869 sgot->contents);
1870 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1871 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1872 }
1873
1874 if (elf_section_data (sgot->output_section) != NULL)
1875 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1876
1877 return TRUE;
1878 }
1879
1880 static enum elf_reloc_type_class
1881 elf_vax_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
1882 const asection *rel_sec ATTRIBUTE_UNUSED,
1883 const Elf_Internal_Rela *rela)
1884 {
1885 switch ((int) ELF32_R_TYPE (rela->r_info))
1886 {
1887 case R_VAX_RELATIVE:
1888 return reloc_class_relative;
1889 case R_VAX_JMP_SLOT:
1890 return reloc_class_plt;
1891 case R_VAX_COPY:
1892 return reloc_class_copy;
1893 default:
1894 return reloc_class_normal;
1895 }
1896 }
1897
1898 static bfd_vma
1899 elf_vax_plt_sym_val (bfd_vma i, const asection *plt,
1900 const arelent *rel ATTRIBUTE_UNUSED)
1901 {
1902 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
1903 }
1904
1905 #define TARGET_LITTLE_SYM vax_elf32_vec
1906 #define TARGET_LITTLE_NAME "elf32-vax"
1907 #define ELF_MACHINE_CODE EM_VAX
1908 #define ELF_MAXPAGESIZE 0x1000
1909
1910 #define elf_backend_create_dynamic_sections \
1911 _bfd_elf_create_dynamic_sections
1912 #define bfd_elf32_bfd_link_hash_table_create \
1913 elf_vax_link_hash_table_create
1914 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
1915
1916 #define elf_backend_check_relocs elf_vax_check_relocs
1917 #define elf_backend_adjust_dynamic_symbol \
1918 elf_vax_adjust_dynamic_symbol
1919 #define elf_backend_always_size_sections \
1920 elf_vax_always_size_sections
1921 #define elf_backend_size_dynamic_sections \
1922 elf_vax_size_dynamic_sections
1923 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
1924 #define elf_backend_relocate_section elf_vax_relocate_section
1925 #define elf_backend_finish_dynamic_symbol \
1926 elf_vax_finish_dynamic_symbol
1927 #define elf_backend_finish_dynamic_sections \
1928 elf_vax_finish_dynamic_sections
1929 #define elf_backend_reloc_type_class elf_vax_reloc_type_class
1930 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook
1931 #define elf_backend_plt_sym_val elf_vax_plt_sym_val
1932 #define bfd_elf32_bfd_merge_private_bfd_data \
1933 elf32_vax_merge_private_bfd_data
1934 #define bfd_elf32_bfd_set_private_flags \
1935 elf32_vax_set_private_flags
1936 #define bfd_elf32_bfd_print_private_bfd_data \
1937 elf32_vax_print_private_bfd_data
1938
1939 #define elf_backend_can_gc_sections 1
1940 #define elf_backend_want_got_plt 1
1941 #define elf_backend_plt_readonly 1
1942 #define elf_backend_want_plt_sym 0
1943 #define elf_backend_got_header_size 16
1944 #define elf_backend_rela_normal 1
1945 #define elf_backend_dtrel_excludes_plt 1
1946
1947 #include "elf32-target.h"
GDB Binutils - Deliverables
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