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[deliverable/binutils-gdb.git] / bfd / elf32-vax.c
1 /* VAX series support for 32-bit ELF
2 Copyright (C) 1993-2019 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 bfd_boolean 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 bfd_boolean
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 (_("%pB: unsupported relocation type %#x"),
291 abfd, r_type);
292 bfd_set_error (bfd_error_bad_value);
293 return FALSE;
294 }
295 cache_ptr->howto = &howto_table[r_type];
296 return TRUE;
297 }
298
299 #define elf_info_to_howto rtype_to_howto
300
301 static const struct
302 {
303 bfd_reloc_code_real_type bfd_val;
304 int elf_val;
305 } reloc_map[] = {
306 { BFD_RELOC_NONE, R_VAX_NONE },
307 { BFD_RELOC_32, R_VAX_32 },
308 { BFD_RELOC_16, R_VAX_16 },
309 { BFD_RELOC_8, R_VAX_8 },
310 { BFD_RELOC_32_PCREL, R_VAX_PC32 },
311 { BFD_RELOC_16_PCREL, R_VAX_PC16 },
312 { BFD_RELOC_8_PCREL, R_VAX_PC8 },
313 { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 },
314 { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 },
315 { BFD_RELOC_NONE, R_VAX_COPY },
316 { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT },
317 { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT },
318 { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE },
319 { BFD_RELOC_CTOR, R_VAX_32 },
320 { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT },
321 { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY },
322 };
323
324 static reloc_howto_type *
325 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code)
326 {
327 unsigned int i;
328 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
329 {
330 if (reloc_map[i].bfd_val == code)
331 return &howto_table[reloc_map[i].elf_val];
332 }
333 return 0;
334 }
335
336 static reloc_howto_type *
337 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
338 const char *r_name)
339 {
340 unsigned int i;
341
342 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++)
343 if (howto_table[i].name != NULL
344 && strcasecmp (howto_table[i].name, r_name) == 0)
345 return &howto_table[i];
346
347 return NULL;
348 }
349
350 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
351 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup
352 #define ELF_ARCH bfd_arch_vax
353 /* end code generated by elf.el */
354 \f
355 /* Functions for the VAX ELF linker. */
356
357 /* The name of the dynamic interpreter. This is put in the .interp
358 section. */
359
360 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so"
361
362 /* The size in bytes of an entry in the procedure linkage table. */
363
364 #define PLT_ENTRY_SIZE 12
365
366 /* The first entry in a procedure linkage table looks like this. See
367 the SVR4 ABI VAX supplement to see how this works. */
368
369 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] =
370 {
371 0xdd, 0xef, /* pushl l^ */
372 0, 0, 0, 0, /* offset to .plt.got + 4 */
373 0x17, 0xff, /* jmp @L^(pc) */
374 0, 0, 0, 0, /* offset to .plt.got + 8 */
375 };
376
377 /* Subsequent entries in a procedure linkage table look like this. */
378
379 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] =
380 {
381 0xfc, 0x0f, /* .word ^M<r11:r2> */
382 0x16, 0xef, /* jsb L^(pc) */
383 0, 0, 0, 0, /* replaced with offset to start of .plt */
384 0, 0, 0, 0, /* index into .rela.plt */
385 };
386
387 /* The VAX linker needs to keep track of the number of relocs that it
388 decides to copy in check_relocs for each symbol. This is so that it
389 can discard PC relative relocs if it doesn't need them when linking
390 with -Bsymbolic. We store the information in a field extending the
391 regular ELF linker hash table. */
392
393 /* This structure keeps track of the number of PC relative relocs we have
394 copied for a given symbol. */
395
396 struct elf_vax_pcrel_relocs_copied
397 {
398 /* Next section. */
399 struct elf_vax_pcrel_relocs_copied *next;
400 /* A section in dynobj. */
401 asection *section;
402 /* Number of relocs copied in this section. */
403 bfd_size_type count;
404 };
405
406 /* VAX ELF linker hash entry. */
407
408 struct elf_vax_link_hash_entry
409 {
410 struct elf_link_hash_entry root;
411
412 /* Number of PC relative relocs copied for this symbol. */
413 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied;
414
415 bfd_vma got_addend;
416 };
417
418 /* Declare this now that the above structures are defined. */
419
420 static bfd_boolean elf_vax_discard_copies (struct elf_vax_link_hash_entry *,
421 void *);
422
423 /* Declare this now that the above structures are defined. */
424
425 static bfd_boolean elf_vax_instantiate_got_entries (struct elf_link_hash_entry *,
426 void *);
427
428 /* Traverse an VAX ELF linker hash table. */
429
430 #define elf_vax_link_hash_traverse(table, func, info) \
431 (elf_link_hash_traverse \
432 ((table), \
433 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \
434 (info)))
435
436 /* Create an entry in an VAX ELF linker hash table. */
437
438 static struct bfd_hash_entry *
439 elf_vax_link_hash_newfunc (struct bfd_hash_entry *entry,
440 struct bfd_hash_table *table,
441 const char *string)
442 {
443 struct elf_vax_link_hash_entry *ret =
444 (struct elf_vax_link_hash_entry *) entry;
445
446 /* Allocate the structure if it has not already been allocated by a
447 subclass. */
448 if (ret == NULL)
449 ret = ((struct elf_vax_link_hash_entry *)
450 bfd_hash_allocate (table,
451 sizeof (struct elf_vax_link_hash_entry)));
452 if (ret == NULL)
453 return (struct bfd_hash_entry *) ret;
454
455 /* Call the allocation method of the superclass. */
456 ret = ((struct elf_vax_link_hash_entry *)
457 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
458 table, string));
459 if (ret != NULL)
460 {
461 ret->pcrel_relocs_copied = NULL;
462 }
463
464 return (struct bfd_hash_entry *) ret;
465 }
466
467 /* Create an VAX ELF linker hash table. */
468
469 static struct bfd_link_hash_table *
470 elf_vax_link_hash_table_create (bfd *abfd)
471 {
472 struct elf_link_hash_table *ret;
473 bfd_size_type amt = sizeof (struct elf_link_hash_table);
474
475 ret = bfd_zmalloc (amt);
476 if (ret == NULL)
477 return NULL;
478
479 if (!_bfd_elf_link_hash_table_init (ret, abfd,
480 elf_vax_link_hash_newfunc,
481 sizeof (struct elf_vax_link_hash_entry),
482 GENERIC_ELF_DATA))
483 {
484 free (ret);
485 return NULL;
486 }
487
488 return &ret->root;
489 }
490
491 /* Keep vax-specific flags in the ELF header */
492 static bfd_boolean
493 elf32_vax_set_private_flags (bfd *abfd, flagword flags)
494 {
495 elf_elfheader (abfd)->e_flags = flags;
496 elf_flags_init (abfd) = TRUE;
497 return TRUE;
498 }
499
500 /* Merge backend specific data from an object file to the output
501 object file when linking. */
502 static bfd_boolean
503 elf32_vax_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
504 {
505 bfd *obfd = info->output_bfd;
506 flagword in_flags;
507
508 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
509 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
510 return TRUE;
511
512 in_flags = elf_elfheader (ibfd)->e_flags;
513
514 if (!elf_flags_init (obfd))
515 {
516 elf_flags_init (obfd) = TRUE;
517 elf_elfheader (obfd)->e_flags = in_flags;
518 }
519
520 return TRUE;
521 }
522
523 /* Display the flags field */
524 static bfd_boolean
525 elf32_vax_print_private_bfd_data (bfd *abfd, void * ptr)
526 {
527 FILE *file = (FILE *) ptr;
528
529 BFD_ASSERT (abfd != NULL && ptr != NULL);
530
531 /* Print normal ELF private data. */
532 _bfd_elf_print_private_bfd_data (abfd, ptr);
533
534 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
535
536 /* xgettext:c-format */
537 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
538
539 if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC)
540 fprintf (file, _(" [nonpic]"));
541
542 if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT)
543 fprintf (file, _(" [d-float]"));
544
545 if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT)
546 fprintf (file, _(" [g-float]"));
547
548 fputc ('\n', file);
549
550 return TRUE;
551 }
552 /* Look through the relocs for a section during the first phase, and
553 allocate space in the global offset table or procedure linkage
554 table. */
555
556 static bfd_boolean
557 elf_vax_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec,
558 const Elf_Internal_Rela *relocs)
559 {
560 bfd *dynobj;
561 Elf_Internal_Shdr *symtab_hdr;
562 struct elf_link_hash_entry **sym_hashes;
563 const Elf_Internal_Rela *rel;
564 const Elf_Internal_Rela *rel_end;
565 asection *sreloc;
566
567 if (bfd_link_relocatable (info))
568 return TRUE;
569
570 dynobj = elf_hash_table (info)->dynobj;
571 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
572 sym_hashes = elf_sym_hashes (abfd);
573
574 sreloc = NULL;
575
576 rel_end = relocs + sec->reloc_count;
577 for (rel = relocs; rel < rel_end; rel++)
578 {
579 unsigned long r_symndx;
580 struct elf_link_hash_entry *h;
581
582 r_symndx = ELF32_R_SYM (rel->r_info);
583
584 if (r_symndx < symtab_hdr->sh_info)
585 h = NULL;
586 else
587 {
588 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
589 while (h->root.type == bfd_link_hash_indirect
590 || h->root.type == bfd_link_hash_warning)
591 h = (struct elf_link_hash_entry *) h->root.u.i.link;
592 }
593
594 switch (ELF32_R_TYPE (rel->r_info))
595 {
596 case R_VAX_GOT32:
597 BFD_ASSERT (h != NULL);
598
599 /* If this is a local symbol, we resolve it directly without
600 creating a global offset table entry. */
601 if (h->forced_local
602 || h == elf_hash_table (info)->hgot
603 || h == elf_hash_table (info)->hplt)
604 break;
605
606 /* This symbol requires a global offset table entry. */
607
608 if (dynobj == NULL)
609 {
610 /* Create the .got section. */
611 elf_hash_table (info)->dynobj = dynobj = abfd;
612 if (!_bfd_elf_create_got_section (dynobj, info))
613 return FALSE;
614 }
615
616 if (h != NULL)
617 {
618 struct elf_vax_link_hash_entry *eh;
619
620 eh = (struct elf_vax_link_hash_entry *) h;
621 if (h->got.refcount == -1)
622 {
623 h->got.refcount = 1;
624 eh->got_addend = rel->r_addend;
625 }
626 else
627 {
628 h->got.refcount++;
629 if (eh->got_addend != (bfd_vma) rel->r_addend)
630 _bfd_error_handler
631 /* xgettext:c-format */
632 (_("%pB: warning: GOT addend of %" PRId64 " to `%s' does"
633 " not match previous GOT addend of %" PRId64),
634 abfd, (int64_t) rel->r_addend, h->root.root.string,
635 (int64_t) eh->got_addend);
636
637 }
638 }
639 break;
640
641 case R_VAX_PLT32:
642 /* This symbol requires a procedure linkage table entry. We
643 actually build the entry in adjust_dynamic_symbol,
644 because this might be a case of linking PIC code which is
645 never referenced by a dynamic object, in which case we
646 don't need to generate a procedure linkage table entry
647 after all. */
648 BFD_ASSERT (h != NULL);
649
650 /* If this is a local symbol, we resolve it directly without
651 creating a procedure linkage table entry. */
652 if (h->forced_local)
653 break;
654
655 h->needs_plt = 1;
656 if (h->plt.refcount == -1)
657 h->plt.refcount = 1;
658 else
659 h->plt.refcount++;
660 break;
661
662 case R_VAX_PC8:
663 case R_VAX_PC16:
664 case R_VAX_PC32:
665 /* If we are creating a shared library and this is not a local
666 symbol, we need to copy the reloc into the shared library.
667 However when linking with -Bsymbolic and this is a global
668 symbol which is defined in an object we are including in the
669 link (i.e., DEF_REGULAR is set), then we can resolve the
670 reloc directly. At this point we have not seen all the input
671 files, so it is possible that DEF_REGULAR is not set now but
672 will be set later (it is never cleared). We account for that
673 possibility below by storing information in the
674 pcrel_relocs_copied field of the hash table entry. */
675 if (!(bfd_link_pic (info)
676 && (sec->flags & SEC_ALLOC) != 0
677 && h != NULL
678 && (!info->symbolic
679 || !h->def_regular)))
680 {
681 if (h != NULL
682 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
683 && !h->forced_local)
684 {
685 /* Make sure a plt entry is created for this symbol if
686 it turns out to be a function defined by a dynamic
687 object. */
688 if (h->plt.refcount == -1)
689 h->plt.refcount = 1;
690 else
691 h->plt.refcount++;
692 }
693 break;
694 }
695 /* If this is a local symbol, we can resolve it directly. */
696 if (h != NULL
697 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
698 || h->forced_local))
699 break;
700
701 /* Fall through. */
702 case R_VAX_8:
703 case R_VAX_16:
704 case R_VAX_32:
705 if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
706 {
707 /* Make sure a plt entry is created for this symbol if it
708 turns out to be a function defined by a dynamic object. */
709 if (h->plt.refcount == -1)
710 h->plt.refcount = 1;
711 else
712 h->plt.refcount++;
713 }
714
715 /* If we are creating a shared library, we need to copy the
716 reloc into the shared library. */
717 if (bfd_link_pic (info)
718 && (sec->flags & SEC_ALLOC) != 0)
719 {
720 /* When creating a shared object, we must copy these
721 reloc types into the output file. We create a reloc
722 section in dynobj and make room for this reloc. */
723 if (sreloc == NULL)
724 {
725 sreloc = _bfd_elf_make_dynamic_reloc_section
726 (sec, dynobj, 2, abfd, /*rela?*/ TRUE);
727
728 if (sreloc == NULL)
729 return FALSE;
730
731 if (sec->flags & SEC_READONLY)
732 info->flags |= DF_TEXTREL;
733 }
734
735 sreloc->size += sizeof (Elf32_External_Rela);
736
737 /* If we are linking with -Bsymbolic, we count the number of
738 PC relative relocations we have entered for this symbol,
739 so that we can discard them again if the symbol is later
740 defined by a regular object. Note that this function is
741 only called if we are using a vaxelf linker hash table,
742 which means that h is really a pointer to an
743 elf_vax_link_hash_entry. */
744 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8
745 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16
746 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32)
747 && info->symbolic)
748 {
749 struct elf_vax_link_hash_entry *eh;
750 struct elf_vax_pcrel_relocs_copied *p;
751
752 eh = (struct elf_vax_link_hash_entry *) h;
753
754 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
755 if (p->section == sreloc)
756 break;
757
758 if (p == NULL)
759 {
760 p = ((struct elf_vax_pcrel_relocs_copied *)
761 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
762 if (p == NULL)
763 return FALSE;
764 p->next = eh->pcrel_relocs_copied;
765 eh->pcrel_relocs_copied = p;
766 p->section = sreloc;
767 p->count = 0;
768 }
769
770 ++p->count;
771 }
772 }
773
774 break;
775
776 /* This relocation describes the C++ object vtable hierarchy.
777 Reconstruct it for later use during GC. */
778 case R_VAX_GNU_VTINHERIT:
779 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
780 return FALSE;
781 break;
782
783 /* This relocation describes which C++ vtable entries are actually
784 used. Record for later use during GC. */
785 case R_VAX_GNU_VTENTRY:
786 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
787 return FALSE;
788 break;
789
790 default:
791 break;
792 }
793 }
794
795 return TRUE;
796 }
797
798 /* Return the section that should be marked against GC for a given
799 relocation. */
800
801 static asection *
802 elf_vax_gc_mark_hook (asection *sec,
803 struct bfd_link_info *info,
804 Elf_Internal_Rela *rel,
805 struct elf_link_hash_entry *h,
806 Elf_Internal_Sym *sym)
807 {
808 if (h != NULL)
809 switch (ELF32_R_TYPE (rel->r_info))
810 {
811 case R_VAX_GNU_VTINHERIT:
812 case R_VAX_GNU_VTENTRY:
813 return NULL;
814 }
815
816 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
817 }
818
819 /* Adjust a symbol defined by a dynamic object and referenced by a
820 regular object. The current definition is in some section of the
821 dynamic object, but we're not including those sections. We have to
822 change the definition to something the rest of the link can
823 understand. */
824
825 static bfd_boolean
826 elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info,
827 struct elf_link_hash_entry *h)
828 {
829 bfd *dynobj;
830 asection *s;
831
832 dynobj = elf_hash_table (info)->dynobj;
833
834 /* Make sure we know what is going on here. */
835 BFD_ASSERT (dynobj != NULL
836 && (h->needs_plt
837 || h->is_weakalias
838 || (h->def_dynamic
839 && h->ref_regular
840 && !h->def_regular)));
841
842 /* If this is a function, put it in the procedure linkage table. We
843 will fill in the contents of the procedure linkage table later,
844 when we know the address of the .got section. */
845 if (h->type == STT_FUNC
846 || h->needs_plt)
847 {
848 if (h->plt.refcount <= 0
849 || SYMBOL_CALLS_LOCAL (info, h)
850 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
851 && h->root.type == bfd_link_hash_undefweak))
852 {
853 /* This case can occur if we saw a PLTxx reloc in an input
854 file, but the symbol was never referred to by a dynamic
855 object, or if all references were garbage collected. In
856 such a case, we don't actually need to build a procedure
857 linkage table, and we can just do a PCxx reloc instead. */
858 h->plt.offset = (bfd_vma) -1;
859 h->needs_plt = 0;
860 return TRUE;
861 }
862
863 s = elf_hash_table (info)->splt;
864 BFD_ASSERT (s != NULL);
865
866 /* If this is the first .plt entry, make room for the special
867 first entry. */
868 if (s->size == 0)
869 {
870 s->size += PLT_ENTRY_SIZE;
871 }
872
873 /* If this symbol is not defined in a regular file, and we are
874 not generating a shared library, then set the symbol to this
875 location in the .plt. This is required to make function
876 pointers compare as equal between the normal executable and
877 the shared library. */
878 if (!bfd_link_pic (info)
879 && !h->def_regular)
880 {
881 h->root.u.def.section = s;
882 h->root.u.def.value = s->size;
883 }
884
885 h->plt.offset = s->size;
886
887 /* Make room for this entry. */
888 s->size += PLT_ENTRY_SIZE;
889
890 /* We also need to make an entry in the .got.plt section, which
891 will be placed in the .got section by the linker script. */
892
893 s = elf_hash_table (info)->sgotplt;
894 BFD_ASSERT (s != NULL);
895 s->size += 4;
896
897 /* We also need to make an entry in the .rela.plt section. */
898
899 s = elf_hash_table (info)->srelplt;
900 BFD_ASSERT (s != NULL);
901 s->size += sizeof (Elf32_External_Rela);
902
903 return TRUE;
904 }
905
906 /* Reinitialize the plt offset now that it is not used as a reference
907 count any more. */
908 h->plt.offset = (bfd_vma) -1;
909
910 /* If this is a weak symbol, and there is a real definition, the
911 processor independent code will have arranged for us to see the
912 real definition first, and we can just use the same value. */
913 if (h->is_weakalias)
914 {
915 struct elf_link_hash_entry *def = weakdef (h);
916 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
917 h->root.u.def.section = def->root.u.def.section;
918 h->root.u.def.value = def->root.u.def.value;
919 return TRUE;
920 }
921
922 /* This is a reference to a symbol defined by a dynamic object which
923 is not a function. */
924
925 /* If we are creating a shared library, we must presume that the
926 only references to the symbol are via the global offset table.
927 For such cases we need not do anything here; the relocations will
928 be handled correctly by relocate_section. */
929 if (bfd_link_pic (info))
930 return TRUE;
931
932 /* We must allocate the symbol in our .dynbss section, which will
933 become part of the .bss section of the executable. There will be
934 an entry for this symbol in the .dynsym section. The dynamic
935 object will contain position independent code, so all references
936 from the dynamic object to this symbol will go through the global
937 offset table. The dynamic linker will use the .dynsym entry to
938 determine the address it must put in the global offset table, so
939 both the dynamic object and the regular object will refer to the
940 same memory location for the variable. */
941
942 s = bfd_get_linker_section (dynobj, ".dynbss");
943 BFD_ASSERT (s != NULL);
944
945 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to
946 copy the initial value out of the dynamic object and into the
947 runtime process image. We need to remember the offset into the
948 .rela.bss section we are going to use. */
949 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
950 {
951 asection *srel;
952
953 srel = bfd_get_linker_section (dynobj, ".rela.bss");
954 BFD_ASSERT (srel != NULL);
955 srel->size += sizeof (Elf32_External_Rela);
956 h->needs_copy = 1;
957 }
958
959 return _bfd_elf_adjust_dynamic_copy (info, h, s);
960 }
961
962 /* This function is called via elf_link_hash_traverse. It resets GOT
963 and PLT (.GOT) reference counts back to -1 so normal PC32 relocation
964 will be done. */
965
966 static bfd_boolean
967 elf_vax_discard_got_entries (struct elf_link_hash_entry *h,
968 void *infoptr ATTRIBUTE_UNUSED)
969 {
970 h->got.refcount = -1;
971 h->plt.refcount = -1;
972
973 return TRUE;
974 }
975
976 /* Discard unused dynamic data if this is a static link. */
977
978 static bfd_boolean
979 elf_vax_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
980 struct bfd_link_info *info)
981 {
982 bfd *dynobj;
983 asection *s;
984
985 dynobj = elf_hash_table (info)->dynobj;
986
987 if (dynobj && !elf_hash_table (info)->dynamic_sections_created)
988 {
989 /* We may have created entries in the .rela.got and .got sections.
990 However, if we are not creating the dynamic sections, we will
991 not actually use these entries. Reset the size of .rela.got
992 and .got, which will cause them to get stripped from the output
993 file below. */
994 s = elf_hash_table (info)->srelgot;
995 if (s != NULL)
996 s->size = 0;
997 s = elf_hash_table (info)->sgotplt;
998 if (s != NULL)
999 s->size = 0;
1000 s = elf_hash_table (info)->sgot;
1001 if (s != NULL)
1002 s->size = 0;
1003 }
1004
1005 /* If this is a static link, we need to discard all the got entries we've
1006 recorded. */
1007 if (!dynobj || !elf_hash_table (info)->dynamic_sections_created)
1008 elf_link_hash_traverse (elf_hash_table (info),
1009 elf_vax_discard_got_entries,
1010 info);
1011
1012 return TRUE;
1013 }
1014
1015 /* Set the sizes of the dynamic sections. */
1016
1017 static bfd_boolean
1018 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1019 {
1020 bfd *dynobj;
1021 asection *s;
1022 bfd_boolean plt;
1023 bfd_boolean relocs;
1024 bfd_boolean reltext;
1025
1026 dynobj = elf_hash_table (info)->dynobj;
1027 BFD_ASSERT (dynobj != NULL);
1028
1029 if (elf_hash_table (info)->dynamic_sections_created)
1030 {
1031 /* Set the contents of the .interp section to the interpreter. */
1032 if (bfd_link_executable (info) && !info->nointerp)
1033 {
1034 s = bfd_get_linker_section (dynobj, ".interp");
1035 BFD_ASSERT (s != NULL);
1036 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1037 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1038 }
1039 }
1040
1041 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1042 relative relocs against symbols defined in a regular object. We
1043 allocated space for them in the check_relocs routine, but we will not
1044 fill them in in the relocate_section routine. */
1045 if (bfd_link_pic (info) && info->symbolic)
1046 elf_vax_link_hash_traverse (elf_hash_table (info),
1047 elf_vax_discard_copies,
1048 NULL);
1049
1050 /* If this is a -Bsymbolic shared link, we need to discard all the got
1051 entries we've recorded. Otherwise, we need to instantiate (allocate
1052 space for them). */
1053 elf_link_hash_traverse (elf_hash_table (info),
1054 elf_vax_instantiate_got_entries,
1055 info);
1056
1057 /* The check_relocs and adjust_dynamic_symbol entry points have
1058 determined the sizes of the various dynamic sections. Allocate
1059 memory for them. */
1060 plt = FALSE;
1061 relocs = FALSE;
1062 reltext = FALSE;
1063 for (s = dynobj->sections; s != NULL; s = s->next)
1064 {
1065 const char *name;
1066
1067 if ((s->flags & SEC_LINKER_CREATED) == 0)
1068 continue;
1069
1070 /* It's OK to base decisions on the section name, because none
1071 of the dynobj section names depend upon the input files. */
1072 name = bfd_section_name (s);
1073
1074 if (strcmp (name, ".plt") == 0)
1075 {
1076 /* Remember whether there is a PLT. */
1077 plt = s->size != 0;
1078 }
1079 else if (CONST_STRNEQ (name, ".rela"))
1080 {
1081 if (s->size != 0)
1082 {
1083 asection *target;
1084
1085 /* Remember whether there are any reloc sections other
1086 than .rela.plt. */
1087 if (strcmp (name, ".rela.plt") != 0)
1088 {
1089 const char *outname;
1090
1091 relocs = TRUE;
1092
1093 /* If this relocation section applies to a read only
1094 section, then we probably need a DT_TEXTREL
1095 entry. .rela.plt is actually associated with
1096 .got.plt, which is never readonly. */
1097 outname = bfd_section_name (s->output_section);
1098 target = bfd_get_section_by_name (output_bfd, outname + 5);
1099 if (target != NULL
1100 && (target->flags & SEC_READONLY) != 0
1101 && (target->flags & SEC_ALLOC) != 0)
1102 reltext = TRUE;
1103 }
1104
1105 /* We use the reloc_count field as a counter if we need
1106 to copy relocs into the output file. */
1107 s->reloc_count = 0;
1108 }
1109 }
1110 else if (! CONST_STRNEQ (name, ".got")
1111 && strcmp (name, ".dynbss") != 0)
1112 {
1113 /* It's not one of our sections, so don't allocate space. */
1114 continue;
1115 }
1116
1117 if (s->size == 0)
1118 {
1119 /* If we don't need this section, strip it from the
1120 output file. This is mostly to handle .rela.bss and
1121 .rela.plt. We must create both sections in
1122 create_dynamic_sections, because they must be created
1123 before the linker maps input sections to output
1124 sections. The linker does that before
1125 adjust_dynamic_symbol is called, and it is that
1126 function which decides whether anything needs to go
1127 into these sections. */
1128 s->flags |= SEC_EXCLUDE;
1129 continue;
1130 }
1131
1132 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1133 continue;
1134
1135 /* Allocate memory for the section contents. */
1136 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1137 if (s->contents == NULL)
1138 return FALSE;
1139 }
1140
1141 if (elf_hash_table (info)->dynamic_sections_created)
1142 {
1143 /* Add some entries to the .dynamic section. We fill in the
1144 values later, in elf_vax_finish_dynamic_sections, but we
1145 must add the entries now so that we get the correct size for
1146 the .dynamic section. The DT_DEBUG entry is filled in by the
1147 dynamic linker and used by the debugger. */
1148 #define add_dynamic_entry(TAG, VAL) \
1149 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1150
1151 if (!bfd_link_pic (info))
1152 {
1153 if (!add_dynamic_entry (DT_DEBUG, 0))
1154 return FALSE;
1155 }
1156
1157 if (plt)
1158 {
1159 if (!add_dynamic_entry (DT_PLTGOT, 0)
1160 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1161 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1162 || !add_dynamic_entry (DT_JMPREL, 0))
1163 return FALSE;
1164 }
1165
1166 if (relocs)
1167 {
1168 if (!add_dynamic_entry (DT_RELA, 0)
1169 || !add_dynamic_entry (DT_RELASZ, 0)
1170 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1171 return FALSE;
1172 }
1173
1174 if (reltext || (info->flags & DF_TEXTREL) != 0)
1175 {
1176 if (!add_dynamic_entry (DT_TEXTREL, 0))
1177 return FALSE;
1178 }
1179 }
1180 #undef add_dynamic_entry
1181
1182 return TRUE;
1183 }
1184
1185 /* This function is called via elf_vax_link_hash_traverse if we are
1186 creating a shared object with -Bsymbolic. It discards the space
1187 allocated to copy PC relative relocs against symbols which are defined
1188 in regular objects. We allocated space for them in the check_relocs
1189 routine, but we won't fill them in in the relocate_section routine. */
1190
1191 static bfd_boolean
1192 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h,
1193 void * ignore ATTRIBUTE_UNUSED)
1194 {
1195 struct elf_vax_pcrel_relocs_copied *s;
1196
1197 /* We only discard relocs for symbols defined in a regular object. */
1198 if (!h->root.def_regular)
1199 return TRUE;
1200
1201 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1202 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1203
1204 return TRUE;
1205 }
1206
1207 /* This function is called via elf_link_hash_traverse. It looks for
1208 entries that have GOT or PLT (.GOT) references. If creating a shared
1209 object with -Bsymbolic, or the symbol has been forced local, then it
1210 resets the reference count back to -1 so normal PC32 relocation will
1211 be done. Otherwise space in the .got and .rela.got will be reserved
1212 for the symbol. */
1213
1214 static bfd_boolean
1215 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, void * infoptr)
1216 {
1217 struct bfd_link_info *info = (struct bfd_link_info *) infoptr;
1218 bfd *dynobj;
1219 asection *sgot;
1220 asection *srelgot;
1221
1222 /* We don't care about non-GOT (and non-PLT) entries. */
1223 if (h->got.refcount <= 0 && h->plt.refcount <= 0)
1224 return TRUE;
1225
1226 dynobj = elf_hash_table (info)->dynobj;
1227 BFD_ASSERT (dynobj != NULL);
1228
1229 sgot = elf_hash_table (info)->sgot;
1230 srelgot = elf_hash_table (info)->srelgot;
1231
1232 if (SYMBOL_REFERENCES_LOCAL (info, h))
1233 {
1234 h->got.refcount = -1;
1235 h->plt.refcount = -1;
1236 }
1237 else if (h->got.refcount > 0)
1238 {
1239 /* Make sure this symbol is output as a dynamic symbol. */
1240 if (h->dynindx == -1)
1241 {
1242 if (!bfd_elf_link_record_dynamic_symbol (info, h))
1243 return FALSE;
1244 }
1245
1246 /* Allocate space in the .got and .rela.got sections. */
1247 sgot->size += 4;
1248 srelgot->size += sizeof (Elf32_External_Rela);
1249 }
1250
1251 return TRUE;
1252 }
1253
1254 /* Relocate an VAX ELF section. */
1255
1256 static bfd_boolean
1257 elf_vax_relocate_section (bfd *output_bfd,
1258 struct bfd_link_info *info,
1259 bfd *input_bfd,
1260 asection *input_section,
1261 bfd_byte *contents,
1262 Elf_Internal_Rela *relocs,
1263 Elf_Internal_Sym *local_syms,
1264 asection **local_sections)
1265 {
1266 Elf_Internal_Shdr *symtab_hdr;
1267 struct elf_link_hash_entry **sym_hashes;
1268 bfd_vma plt_index;
1269 bfd_vma got_offset;
1270 asection *sgot;
1271 asection *splt;
1272 asection *sgotplt;
1273 asection *sreloc;
1274 Elf_Internal_Rela *rel;
1275 Elf_Internal_Rela *relend;
1276
1277 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1278 sym_hashes = elf_sym_hashes (input_bfd);
1279
1280 sgot = NULL;
1281 splt = NULL;
1282 sgotplt = NULL;
1283 sreloc = NULL;
1284
1285 rel = relocs;
1286 relend = relocs + input_section->reloc_count;
1287 for (; rel < relend; rel++)
1288 {
1289 int r_type;
1290 reloc_howto_type *howto;
1291 unsigned long r_symndx;
1292 struct elf_link_hash_entry *h;
1293 Elf_Internal_Sym *sym;
1294 asection *sec;
1295 bfd_vma relocation;
1296 bfd_reloc_status_type r;
1297
1298 r_type = ELF32_R_TYPE (rel->r_info);
1299 if (r_type < 0 || r_type >= (int) R_VAX_max)
1300 {
1301 bfd_set_error (bfd_error_bad_value);
1302 return FALSE;
1303 }
1304 howto = howto_table + r_type;
1305
1306 r_symndx = ELF32_R_SYM (rel->r_info);
1307 h = NULL;
1308 sym = NULL;
1309 sec = NULL;
1310 if (r_symndx < symtab_hdr->sh_info)
1311 {
1312 sym = local_syms + r_symndx;
1313 sec = local_sections[r_symndx];
1314 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1315 }
1316 else
1317 {
1318 bfd_boolean unresolved_reloc;
1319 bfd_boolean warned, ignored;
1320
1321 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1322 r_symndx, symtab_hdr, sym_hashes,
1323 h, sec, relocation,
1324 unresolved_reloc, warned, ignored);
1325
1326 if ((h->root.type == bfd_link_hash_defined
1327 || h->root.type == bfd_link_hash_defweak)
1328 && ((r_type == R_VAX_PLT32
1329 && h->plt.offset != (bfd_vma) -1
1330 && !h->forced_local
1331 && elf_hash_table (info)->dynamic_sections_created)
1332 || (r_type == R_VAX_GOT32
1333 && h->got.offset != (bfd_vma) -1
1334 && !h->forced_local
1335 && elf_hash_table (info)->dynamic_sections_created
1336 && (! bfd_link_pic (info)
1337 || (! info->symbolic && h->dynindx != -1)
1338 || !h->def_regular))
1339 || (bfd_link_pic (info)
1340 && ((! info->symbolic && h->dynindx != -1)
1341 || !h->def_regular)
1342 && ((input_section->flags & SEC_ALLOC) != 0
1343 /* DWARF will emit R_VAX_32 relocations in its
1344 sections against symbols defined externally
1345 in shared libraries. We can't do anything
1346 with them here. */
1347
1348 || ((input_section->flags & SEC_DEBUGGING) != 0
1349 && h->def_dynamic))
1350 && (r_type == R_VAX_8
1351 || r_type == R_VAX_16
1352 || r_type == R_VAX_32))))
1353 /* In these cases, we don't need the relocation
1354 value. We check specially because in some
1355 obscure cases sec->output_section will be NULL. */
1356 relocation = 0;
1357 }
1358
1359 if (sec != NULL && discarded_section (sec))
1360 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1361 rel, 1, relend, howto, 0, contents);
1362
1363 if (bfd_link_relocatable (info))
1364 continue;
1365
1366 switch (r_type)
1367 {
1368 case R_VAX_GOT32:
1369 /* Relocation is to the address of the entry for this symbol
1370 in the global offset table. */
1371
1372 /* Resolve a GOTxx reloc against a local symbol directly,
1373 without using the global offset table. */
1374 if (h == NULL
1375 || h->got.offset == (bfd_vma) -1)
1376 break;
1377
1378 {
1379 bfd_vma off;
1380
1381 sgot = elf_hash_table (info)->sgot;
1382 BFD_ASSERT (sgot != NULL);
1383
1384 off = h->got.offset;
1385 BFD_ASSERT (off < sgot->size);
1386
1387 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off);
1388
1389 relocation = sgot->output_offset + off;
1390 /* The GOT relocation uses the addend. */
1391 rel->r_addend = 0;
1392
1393 /* Change the reference to be indirect. */
1394 contents[rel->r_offset - 1] |= 0x10;
1395 relocation += sgot->output_section->vma;
1396 }
1397 break;
1398
1399 case R_VAX_PC32:
1400 /* If we are creating an executable and the function this
1401 reloc refers to is in a shared lib, then we made a PLT
1402 entry for this symbol and need to handle the reloc like
1403 a PLT reloc. */
1404 if (bfd_link_pic (info))
1405 goto r_vax_pc32_shared;
1406 /* Fall through. */
1407 case R_VAX_PLT32:
1408 /* Relocation is to the entry for this symbol in the
1409 procedure linkage table. */
1410
1411 /* Resolve a PLTxx reloc against a local symbol directly,
1412 without using the procedure linkage table. */
1413 if (h == NULL
1414 || h->plt.offset == (bfd_vma) -1)
1415 break;
1416
1417 splt = elf_hash_table (info)->splt;
1418 BFD_ASSERT (splt != NULL);
1419
1420 sgotplt = elf_hash_table (info)->sgotplt;
1421 BFD_ASSERT (sgotplt != NULL);
1422
1423 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1424
1425 /* Get the offset into the .got table of the entry that
1426 corresponds to this function. Each .got entry is 4 bytes.
1427 The first two are reserved. */
1428 got_offset = (plt_index + 3) * 4;
1429
1430 /* We want the relocation to point into the .got.plt instead
1431 of the plt itself. */
1432 relocation = (sgotplt->output_section->vma
1433 + sgotplt->output_offset
1434 + got_offset);
1435 contents[rel->r_offset-1] |= 0x10; /* make indirect */
1436 if (rel->r_addend == 2)
1437 {
1438 h->plt.offset |= 1;
1439 }
1440 else if (rel->r_addend != 0)
1441 _bfd_error_handler
1442 /* xgettext:c-format */
1443 (_("%pB: warning: PLT addend of %" PRId64 " to `%s'"
1444 " from %pA section ignored"),
1445 input_bfd, (int64_t) rel->r_addend, h->root.root.string,
1446 input_section);
1447 rel->r_addend = 0;
1448
1449 break;
1450
1451 case R_VAX_PC8:
1452 case R_VAX_PC16:
1453 r_vax_pc32_shared:
1454 if (h == NULL
1455 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1456 || h->forced_local)
1457 break;
1458 /* Fall through. */
1459 case R_VAX_8:
1460 case R_VAX_16:
1461 case R_VAX_32:
1462 if (bfd_link_pic (info)
1463 && r_symndx != STN_UNDEF
1464 && (input_section->flags & SEC_ALLOC) != 0
1465 && ((r_type != R_VAX_PC8
1466 && r_type != R_VAX_PC16
1467 && r_type != R_VAX_PC32)
1468 || ((input_section->flags & SEC_CODE)
1469 && (!info->symbolic
1470 || (!h->def_regular && h->type != STT_SECTION)))))
1471 {
1472 Elf_Internal_Rela outrel;
1473 bfd_byte *loc;
1474 bfd_boolean skip, relocate;
1475
1476 /* When generating a shared object, these relocations
1477 are copied into the output file to be resolved at run
1478 time. */
1479 if (sreloc == NULL)
1480 {
1481 sreloc = _bfd_elf_get_dynamic_reloc_section
1482 (input_bfd, input_section, /*rela?*/ TRUE);
1483 if (sreloc == NULL)
1484 return FALSE;
1485 }
1486
1487 skip = FALSE;
1488 relocate = FALSE;
1489
1490 outrel.r_offset =
1491 _bfd_elf_section_offset (output_bfd, info, input_section,
1492 rel->r_offset);
1493 if (outrel.r_offset == (bfd_vma) -1)
1494 skip = TRUE;
1495 if (outrel.r_offset == (bfd_vma) -2)
1496 skip = TRUE, relocate = TRUE;
1497 outrel.r_offset += (input_section->output_section->vma
1498 + input_section->output_offset);
1499
1500 if (skip)
1501 memset (&outrel, 0, sizeof outrel);
1502 /* h->dynindx may be -1 if the symbol was marked to
1503 become local. */
1504 else if (h != NULL
1505 && ((! info->symbolic && h->dynindx != -1)
1506 || !h->def_regular))
1507 {
1508 BFD_ASSERT (h->dynindx != -1);
1509 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1510 outrel.r_addend = relocation + rel->r_addend;
1511 }
1512 else
1513 {
1514 if (r_type == R_VAX_32)
1515 {
1516 relocate = TRUE;
1517 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE);
1518 BFD_ASSERT (bfd_get_signed_32 (input_bfd,
1519 &contents[rel->r_offset]) == 0);
1520 outrel.r_addend = relocation + rel->r_addend;
1521 }
1522 else
1523 {
1524 long indx;
1525
1526 if (bfd_is_abs_section (sec))
1527 indx = 0;
1528 else if (sec == NULL || sec->owner == NULL)
1529 {
1530 bfd_set_error (bfd_error_bad_value);
1531 return FALSE;
1532 }
1533 else
1534 {
1535 asection *osec;
1536
1537 /* We are turning this relocation into one
1538 against a section symbol. It would be
1539 proper to subtract the symbol's value,
1540 osec->vma, from the emitted reloc addend,
1541 but ld.so expects buggy relocs. */
1542 osec = sec->output_section;
1543 indx = elf_section_data (osec)->dynindx;
1544 if (indx == 0)
1545 {
1546 struct elf_link_hash_table *htab;
1547 htab = elf_hash_table (info);
1548 osec = htab->text_index_section;
1549 indx = elf_section_data (osec)->dynindx;
1550 }
1551 BFD_ASSERT (indx != 0);
1552 }
1553
1554 outrel.r_info = ELF32_R_INFO (indx, r_type);
1555 outrel.r_addend = relocation + rel->r_addend;
1556 }
1557 }
1558
1559 if ((input_section->flags & SEC_CODE) != 0
1560 || (ELF32_R_TYPE (outrel.r_info) != R_VAX_32
1561 && ELF32_R_TYPE (outrel.r_info) != R_VAX_RELATIVE
1562 && ELF32_R_TYPE (outrel.r_info) != R_VAX_COPY
1563 && ELF32_R_TYPE (outrel.r_info) != R_VAX_JMP_SLOT
1564 && ELF32_R_TYPE (outrel.r_info) != R_VAX_GLOB_DAT))
1565 {
1566 if (h != NULL)
1567 _bfd_error_handler
1568 /* xgettext:c-format */
1569 (_("%pB: warning: %s relocation against symbol `%s'"
1570 " from %pA section"),
1571 input_bfd, howto->name, h->root.root.string,
1572 input_section);
1573 else
1574 _bfd_error_handler
1575 /* xgettext:c-format */
1576 (_("%pB: warning: %s relocation to %#" PRIx64
1577 " from %pA section"),
1578 input_bfd, howto->name, (uint64_t) 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 (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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