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[binutils-gdb.git] / bfd / elf32-vax.c
blob406c02ac7c56b5f7cb61eaed102291b031eeef20
1 /* VAX series support for 32-bit ELF
2 Copyright (C) 1993-2021 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 bool 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 bool elf_vax_check_relocs (bfd *, struct bfd_link_info *,
36 asection *, const Elf_Internal_Rela *);
37 static bool elf_vax_adjust_dynamic_symbol (struct bfd_link_info *,
38 struct elf_link_hash_entry *);
39 static bool elf_vax_size_dynamic_sections (bfd *, struct bfd_link_info *);
40 static int 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 bool elf_vax_finish_dynamic_symbol (bfd *, struct bfd_link_info *,
45 struct elf_link_hash_entry *,
46 Elf_Internal_Sym *);
47 static bool elf_vax_finish_dynamic_sections (bfd *, struct bfd_link_info *);
48 static bfd_vma elf_vax_plt_sym_val (bfd_vma, const asection *,
49 const arelent *);
50
51 static bool elf32_vax_set_private_flags (bfd *, flagword);
52 static bool elf32_vax_print_private_bfd_data (bfd *, void *);
53
54 static reloc_howto_type howto_table[] = {
55 HOWTO (R_VAX_NONE, /* type */
56 0, /* rightshift */
57 3, /* size (0 = byte, 1 = short, 2 = long) */
58 0, /* bitsize */
59 false, /* pc_relative */
60 0, /* bitpos */
61 complain_overflow_dont, /* complain_on_overflow */
62 bfd_elf_generic_reloc, /* special_function */
63 "R_VAX_NONE", /* name */
64 false, /* partial_inplace */
65 0, /* src_mask */
66 0x00000000, /* dst_mask */
67 false), /* pcrel_offset */
68
69 HOWTO (R_VAX_32, /* type */
70 0, /* rightshift */
71 2, /* size (0 = byte, 1 = short, 2 = long) */
72 32, /* bitsize */
73 false, /* pc_relative */
74 0, /* bitpos */
75 complain_overflow_bitfield, /* complain_on_overflow */
76 bfd_elf_generic_reloc, /* special_function */
77 "R_VAX_32", /* name */
78 false, /* partial_inplace */
79 0, /* src_mask */
80 0xffffffff, /* dst_mask */
81 false), /* pcrel_offset */
82
83 HOWTO (R_VAX_16, /* type */
84 0, /* rightshift */
85 1, /* size (0 = byte, 1 = short, 2 = long) */
86 16, /* bitsize */
87 false, /* pc_relative */
88 0, /* bitpos */
89 complain_overflow_bitfield, /* complain_on_overflow */
90 bfd_elf_generic_reloc, /* special_function */
91 "R_VAX_16", /* name */
92 false, /* partial_inplace */
93 0, /* src_mask */
94 0x0000ffff, /* dst_mask */
95 false), /* pcrel_offset */
96
97 HOWTO (R_VAX_8, /* type */
98 0, /* rightshift */
99 0, /* size (0 = byte, 1 = short, 2 = long) */
100 8, /* bitsize */
101 false, /* pc_relative */
102 0, /* bitpos */
103 complain_overflow_bitfield, /* complain_on_overflow */
104 bfd_elf_generic_reloc, /* special_function */
105 "R_VAX_8", /* name */
106 false, /* partial_inplace */
107 0, /* src_mask */
108 0x000000ff, /* dst_mask */
109 false), /* pcrel_offset */
110
111 HOWTO (R_VAX_PC32, /* type */
112 0, /* rightshift */
113 2, /* size (0 = byte, 1 = short, 2 = long) */
114 32, /* bitsize */
115 true, /* pc_relative */
116 0, /* bitpos */
117 complain_overflow_bitfield, /* complain_on_overflow */
118 bfd_elf_generic_reloc, /* special_function */
119 "R_VAX_PC32", /* name */
120 false, /* partial_inplace */
121 0, /* src_mask */
122 0xffffffff, /* dst_mask */
123 true), /* pcrel_offset */
124
125 HOWTO (R_VAX_PC16, /* type */
126 0, /* rightshift */
127 1, /* size (0 = byte, 1 = short, 2 = long) */
128 16, /* bitsize */
129 true, /* pc_relative */
130 0, /* bitpos */
131 complain_overflow_signed, /* complain_on_overflow */
132 bfd_elf_generic_reloc, /* special_function */
133 "R_VAX_PC16", /* name */
134 false, /* partial_inplace */
135 0, /* src_mask */
136 0x0000ffff, /* dst_mask */
137 true), /* pcrel_offset */
138
139 HOWTO (R_VAX_PC8, /* type */
140 0, /* rightshift */
141 0, /* size (0 = byte, 1 = short, 2 = long) */
142 8, /* bitsize */
143 true, /* pc_relative */
144 0, /* bitpos */
145 complain_overflow_signed, /* complain_on_overflow */
146 bfd_elf_generic_reloc, /* special_function */
147 "R_VAX_PC8", /* name */
148 false, /* partial_inplace */
149 0, /* src_mask */
150 0x000000ff, /* dst_mask */
151 true), /* pcrel_offset */
152
153 HOWTO (R_VAX_GOT32, /* type */
154 0, /* rightshift */
155 2, /* size (0 = byte, 1 = short, 2 = long) */
156 32, /* bitsize */
157 true, /* pc_relative */
158 0, /* bitpos */
159 complain_overflow_bitfield, /* complain_on_overflow */
160 bfd_elf_generic_reloc, /* special_function */
161 "R_VAX_GOT32", /* name */
162 false, /* partial_inplace */
163 0, /* src_mask */
164 0xffffffff, /* dst_mask */
165 true), /* pcrel_offset */
166
167 EMPTY_HOWTO (-1),
168 EMPTY_HOWTO (-1),
169 EMPTY_HOWTO (-1),
170 EMPTY_HOWTO (-1),
171 EMPTY_HOWTO (-1),
172
173 HOWTO (R_VAX_PLT32, /* type */
174 0, /* rightshift */
175 2, /* size (0 = byte, 1 = short, 2 = long) */
176 32, /* bitsize */
177 true, /* pc_relative */
178 0, /* bitpos */
179 complain_overflow_bitfield, /* complain_on_overflow */
180 bfd_elf_generic_reloc, /* special_function */
181 "R_VAX_PLT32", /* name */
182 false, /* partial_inplace */
183 0, /* src_mask */
184 0xffffffff, /* dst_mask */
185 true), /* pcrel_offset */
186
187 EMPTY_HOWTO (-1),
188 EMPTY_HOWTO (-1),
189 EMPTY_HOWTO (-1),
190 EMPTY_HOWTO (-1),
191 EMPTY_HOWTO (-1),
192
193 HOWTO (R_VAX_COPY, /* type */
194 0, /* rightshift */
195 0, /* size (0 = byte, 1 = short, 2 = long) */
196 0, /* bitsize */
197 false, /* pc_relative */
198 0, /* bitpos */
199 complain_overflow_dont, /* complain_on_overflow */
200 bfd_elf_generic_reloc, /* special_function */
201 "R_VAX_COPY", /* name */
202 false, /* partial_inplace */
203 0, /* src_mask */
204 0xffffffff, /* dst_mask */
205 false), /* pcrel_offset */
206
207 HOWTO (R_VAX_GLOB_DAT, /* type */
208 0, /* rightshift */
209 2, /* size (0 = byte, 1 = short, 2 = long) */
210 32, /* bitsize */
211 false, /* pc_relative */
212 0, /* bitpos */
213 complain_overflow_dont, /* complain_on_overflow */
214 bfd_elf_generic_reloc, /* special_function */
215 "R_VAX_GLOB_DAT", /* name */
216 false, /* partial_inplace */
217 0, /* src_mask */
218 0xffffffff, /* dst_mask */
219 false), /* pcrel_offset */
220
221 HOWTO (R_VAX_JMP_SLOT, /* type */
222 0, /* rightshift */
223 2, /* size (0 = byte, 1 = short, 2 = long) */
224 32, /* bitsize */
225 false, /* pc_relative */
226 0, /* bitpos */
227 complain_overflow_dont, /* complain_on_overflow */
228 bfd_elf_generic_reloc, /* special_function */
229 "R_VAX_JMP_SLOT", /* name */
230 false, /* partial_inplace */
231 0, /* src_mask */
232 0xffffffff, /* dst_mask */
233 false), /* pcrel_offset */
234
235 HOWTO (R_VAX_RELATIVE, /* type */
236 0, /* rightshift */
237 2, /* size (0 = byte, 1 = short, 2 = long) */
238 32, /* bitsize */
239 false, /* pc_relative */
240 0, /* bitpos */
241 complain_overflow_dont, /* complain_on_overflow */
242 bfd_elf_generic_reloc, /* special_function */
243 "R_VAX_RELATIVE", /* name */
244 false, /* partial_inplace */
245 0, /* src_mask */
246 0xffffffff, /* dst_mask */
247 false), /* pcrel_offset */
248
249 /* GNU extension to record C++ vtable hierarchy */
250 HOWTO (R_VAX_GNU_VTINHERIT, /* type */
251 0, /* rightshift */
252 2, /* size (0 = byte, 1 = short, 2 = long) */
253 0, /* bitsize */
254 false, /* pc_relative */
255 0, /* bitpos */
256 complain_overflow_dont, /* complain_on_overflow */
257 NULL, /* special_function */
258 "R_VAX_GNU_VTINHERIT", /* name */
259 false, /* partial_inplace */
260 0, /* src_mask */
261 0, /* dst_mask */
262 false), /* pcrel_offset */
263
264 /* GNU extension to record C++ vtable member usage */
265 HOWTO (R_VAX_GNU_VTENTRY, /* type */
266 0, /* rightshift */
267 2, /* size (0 = byte, 1 = short, 2 = long) */
268 0, /* bitsize */
269 false, /* pc_relative */
270 0, /* bitpos */
271 complain_overflow_dont, /* complain_on_overflow */
272 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
273 "R_VAX_GNU_VTENTRY", /* name */
274 false, /* partial_inplace */
275 0, /* src_mask */
276 0, /* dst_mask */
277 false), /* pcrel_offset */
278 };
279
280 static bool
281 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst)
282 {
283 unsigned int r_type;
284
285 r_type = ELF32_R_TYPE (dst->r_info);
286 if (r_type >= R_VAX_max)
287 {
288 /* xgettext:c-format */
289 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
290 abfd, r_type);
291 bfd_set_error (bfd_error_bad_value);
292 return false;
293 }
294 cache_ptr->howto = &howto_table[r_type];
295 return true;
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 bool 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 bool 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 (bool (*) (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 size_t 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 bool
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 bool
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 bool
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 bool
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 (SYMBOL_REFERENCES_LOCAL (info, h)
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 (_("%pB: warning: GOT addend of %" PRId64 " to `%s' does"
632 " not match previous GOT addend of %" PRId64),
633 abfd, (int64_t) rel->r_addend, h->root.root.string,
634 (int64_t) 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 /* Non-GOT reference may need a copy reloc in executable or
715 a dynamic reloc in shared library. */
716 if (h != NULL)
717 h->non_got_ref = 1;
718
719 /* If we are creating a shared library, we need to copy the
720 reloc into the shared library. */
721 if (bfd_link_pic (info)
722 && (sec->flags & SEC_ALLOC) != 0)
723 {
724 /* When creating a shared object, we must copy these
725 reloc types into the output file. We create a reloc
726 section in dynobj and make room for this reloc. */
727 if (sreloc == NULL)
728 {
729 sreloc = _bfd_elf_make_dynamic_reloc_section
730 (sec, dynobj, 2, abfd, /*rela?*/ true);
731
732 if (sreloc == NULL)
733 return false;
734
735 if (sec->flags & SEC_READONLY)
736 info->flags |= DF_TEXTREL;
737 }
738
739 sreloc->size += sizeof (Elf32_External_Rela);
740
741 /* If we are linking with -Bsymbolic, we count the number of
742 PC relative relocations we have entered for this symbol,
743 so that we can discard them again if the symbol is later
744 defined by a regular object. Note that this function is
745 only called if we are using a vaxelf linker hash table,
746 which means that h is really a pointer to an
747 elf_vax_link_hash_entry. */
748 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8
749 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16
750 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32)
751 && info->symbolic)
752 {
753 struct elf_vax_link_hash_entry *eh;
754 struct elf_vax_pcrel_relocs_copied *p;
755
756 eh = (struct elf_vax_link_hash_entry *) h;
757
758 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
759 if (p->section == sreloc)
760 break;
761
762 if (p == NULL)
763 {
764 p = ((struct elf_vax_pcrel_relocs_copied *)
765 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
766 if (p == NULL)
767 return false;
768 p->next = eh->pcrel_relocs_copied;
769 eh->pcrel_relocs_copied = p;
770 p->section = sreloc;
771 p->count = 0;
772 }
773
774 ++p->count;
775 }
776 }
777
778 break;
779
780 /* This relocation describes the C++ object vtable hierarchy.
781 Reconstruct it for later use during GC. */
782 case R_VAX_GNU_VTINHERIT:
783 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
784 return false;
785 break;
786
787 /* This relocation describes which C++ vtable entries are actually
788 used. Record for later use during GC. */
789 case R_VAX_GNU_VTENTRY:
790 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
791 return false;
792 break;
793
794 default:
795 break;
796 }
797 }
798
799 return true;
800 }
801
802 /* Return the section that should be marked against GC for a given
803 relocation. */
804
805 static asection *
806 elf_vax_gc_mark_hook (asection *sec,
807 struct bfd_link_info *info,
808 Elf_Internal_Rela *rel,
809 struct elf_link_hash_entry *h,
810 Elf_Internal_Sym *sym)
811 {
812 if (h != NULL)
813 switch (ELF32_R_TYPE (rel->r_info))
814 {
815 case R_VAX_GNU_VTINHERIT:
816 case R_VAX_GNU_VTENTRY:
817 return NULL;
818 }
819
820 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
821 }
822
823 /* Adjust a symbol defined by a dynamic object and referenced by a
824 regular object. The current definition is in some section of the
825 dynamic object, but we're not including those sections. We have to
826 change the definition to something the rest of the link can
827 understand. */
828
829 static bool
830 elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info,
831 struct elf_link_hash_entry *h)
832 {
833 bfd *dynobj;
834 asection *s;
835
836 dynobj = elf_hash_table (info)->dynobj;
837
838 /* Make sure we know what is going on here. */
839 BFD_ASSERT (dynobj != NULL
840 && (h->needs_plt
841 || h->is_weakalias
842 || (h->def_dynamic
843 && h->ref_regular
844 && !h->def_regular)));
845
846 /* If this is a function, put it in the procedure linkage table. We
847 will fill in the contents of the procedure linkage table later,
848 when we know the address of the .got section. */
849 if (h->type == STT_FUNC
850 || h->needs_plt)
851 {
852 if (h->plt.refcount <= 0
853 || SYMBOL_CALLS_LOCAL (info, h)
854 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
855 && h->root.type == bfd_link_hash_undefweak))
856 {
857 /* This case can occur if we saw a PLTxx reloc in an input
858 file, but the symbol was never referred to by a dynamic
859 object, or if all references were garbage collected. In
860 such a case, we don't actually need to build a procedure
861 linkage table, and we can just do a PCxx reloc instead. */
862 h->plt.offset = (bfd_vma) -1;
863 h->needs_plt = 0;
864 return true;
865 }
866
867 s = elf_hash_table (info)->splt;
868 BFD_ASSERT (s != NULL);
869
870 /* If this is the first .plt entry, make room for the special
871 first entry. */
872 if (s->size == 0)
873 {
874 s->size += PLT_ENTRY_SIZE;
875 }
876
877 /* If this symbol is not defined in a regular file, and we are
878 not generating a shared library, then set the symbol to this
879 location in the .plt. This is required to make function
880 pointers compare as equal between the normal executable and
881 the shared library. */
882 if (!bfd_link_pic (info)
883 && !h->def_regular)
884 {
885 h->root.u.def.section = s;
886 h->root.u.def.value = s->size;
887 }
888
889 h->plt.offset = s->size;
890
891 /* Make room for this entry. */
892 s->size += PLT_ENTRY_SIZE;
893
894 /* We also need to make an entry in the .got.plt section, which
895 will be placed in the .got section by the linker script. */
896
897 s = elf_hash_table (info)->sgotplt;
898 BFD_ASSERT (s != NULL);
899 s->size += 4;
900
901 /* We also need to make an entry in the .rela.plt section. */
902
903 s = elf_hash_table (info)->srelplt;
904 BFD_ASSERT (s != NULL);
905 s->size += sizeof (Elf32_External_Rela);
906
907 return true;
908 }
909
910 /* Reinitialize the plt offset now that it is not used as a reference
911 count any more. */
912 h->plt.offset = (bfd_vma) -1;
913
914 /* If this is a weak symbol, and there is a real definition, the
915 processor independent code will have arranged for us to see the
916 real definition first, and we can just use the same value. */
917 if (h->is_weakalias)
918 {
919 struct elf_link_hash_entry *def = weakdef (h);
920 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
921 h->root.u.def.section = def->root.u.def.section;
922 h->root.u.def.value = def->root.u.def.value;
923 return true;
924 }
925
926 /* This is a reference to a symbol defined by a dynamic object which
927 is not a function. */
928
929 /* If we are creating a shared library, we must presume that the
930 only references to the symbol are via the global offset table.
931 For such cases we need not do anything here; the relocations will
932 be handled correctly by relocate_section. */
933 if (bfd_link_pic (info))
934 return true;
935
936 /* If there are no references to this symbol that do not use the
937 GOT relocation, we don't need to generate a copy reloc. */
938 if (!h->non_got_ref)
939 return true;
940
941 /* We must allocate the symbol in our .dynbss section, which will
942 become part of the .bss section of the executable. There will be
943 an entry for this symbol in the .dynsym section. The dynamic
944 object will contain position independent code, so all references
945 from the dynamic object to this symbol will go through the global
946 offset table. The dynamic linker will use the .dynsym entry to
947 determine the address it must put in the global offset table, so
948 both the dynamic object and the regular object will refer to the
949 same memory location for the variable. */
950
951 s = bfd_get_linker_section (dynobj, ".dynbss");
952 BFD_ASSERT (s != NULL);
953
954 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to
955 copy the initial value out of the dynamic object and into the
956 runtime process image. We need to remember the offset into the
957 .rela.bss section we are going to use. */
958 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
959 {
960 asection *srel;
961
962 srel = bfd_get_linker_section (dynobj, ".rela.bss");
963 BFD_ASSERT (srel != NULL);
964 srel->size += sizeof (Elf32_External_Rela);
965 h->needs_copy = 1;
966 }
967
968 return _bfd_elf_adjust_dynamic_copy (info, h, s);
969 }
970
971 /* This function is called via elf_link_hash_traverse. It resets GOT
972 and PLT (.GOT) reference counts back to -1 so normal PC32 relocation
973 will be done. */
974
975 static bool
976 elf_vax_discard_got_entries (struct elf_link_hash_entry *h,
977 void *infoptr ATTRIBUTE_UNUSED)
978 {
979 h->got.refcount = -1;
980 h->plt.refcount = -1;
981
982 return true;
983 }
984
985 /* Discard unused dynamic data if this is a static link. */
986
987 static bool
988 elf_vax_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
989 struct bfd_link_info *info)
990 {
991 bfd *dynobj;
992 asection *s;
993
994 dynobj = elf_hash_table (info)->dynobj;
995
996 if (dynobj && !elf_hash_table (info)->dynamic_sections_created)
997 {
998 /* We may have created entries in the .rela.got and .got sections.
999 However, if we are not creating the dynamic sections, we will
1000 not actually use these entries. Reset the size of .rela.got
1001 and .got, which will cause them to get stripped from the output
1002 file below. */
1003 s = elf_hash_table (info)->srelgot;
1004 if (s != NULL)
1005 s->size = 0;
1006 s = elf_hash_table (info)->sgotplt;
1007 if (s != NULL)
1008 s->size = 0;
1009 s = elf_hash_table (info)->sgot;
1010 if (s != NULL)
1011 s->size = 0;
1012 }
1013
1014 /* If this is a static link, we need to discard all the got entries we've
1015 recorded. */
1016 if (!dynobj || !elf_hash_table (info)->dynamic_sections_created)
1017 elf_link_hash_traverse (elf_hash_table (info),
1018 elf_vax_discard_got_entries,
1019 info);
1020
1021 return true;
1022 }
1023
1024 /* Set the sizes of the dynamic sections. */
1025
1026 static bool
1027 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1028 {
1029 bfd *dynobj;
1030 asection *s;
1031 bool relocs;
1032
1033 dynobj = elf_hash_table (info)->dynobj;
1034 BFD_ASSERT (dynobj != NULL);
1035
1036 if (elf_hash_table (info)->dynamic_sections_created)
1037 {
1038 /* Set the contents of the .interp section to the interpreter. */
1039 if (bfd_link_executable (info) && !info->nointerp)
1040 {
1041 s = bfd_get_linker_section (dynobj, ".interp");
1042 BFD_ASSERT (s != NULL);
1043 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1044 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1045 }
1046 }
1047
1048 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1049 relative relocs against symbols defined in a regular object. We
1050 allocated space for them in the check_relocs routine, but we will not
1051 fill them in in the relocate_section routine. */
1052 if (bfd_link_pic (info) && info->symbolic)
1053 elf_vax_link_hash_traverse (elf_hash_table (info),
1054 elf_vax_discard_copies,
1055 NULL);
1056
1057 /* If this is a -Bsymbolic shared link, we need to discard all the got
1058 entries we've recorded. Otherwise, we need to instantiate (allocate
1059 space for them). */
1060 elf_link_hash_traverse (elf_hash_table (info),
1061 elf_vax_instantiate_got_entries,
1062 info);
1063
1064 /* The check_relocs and adjust_dynamic_symbol entry points have
1065 determined the sizes of the various dynamic sections. Allocate
1066 memory for them. */
1067 relocs = false;
1068 for (s = dynobj->sections; s != NULL; s = s->next)
1069 {
1070 const char *name;
1071
1072 if ((s->flags & SEC_LINKER_CREATED) == 0)
1073 continue;
1074
1075 /* It's OK to base decisions on the section name, because none
1076 of the dynobj section names depend upon the input files. */
1077 name = bfd_section_name (s);
1078
1079 if (strcmp (name, ".plt") == 0)
1080 {
1081 /* Remember whether there is a PLT. */
1082 ;
1083 }
1084 else if (startswith (name, ".rela"))
1085 {
1086 if (s->size != 0)
1087 {
1088 if (strcmp (name, ".rela.plt") != 0)
1089 relocs = true;
1090
1091 /* We use the reloc_count field as a counter if we need
1092 to copy relocs into the output file. */
1093 s->reloc_count = 0;
1094 }
1095 }
1096 else if (! startswith (name, ".got")
1097 && strcmp (name, ".dynbss") != 0)
1098 {
1099 /* It's not one of our sections, so don't allocate space. */
1100 continue;
1101 }
1102
1103 if (s->size == 0)
1104 {
1105 /* If we don't need this section, strip it from the
1106 output file. This is mostly to handle .rela.bss and
1107 .rela.plt. We must create both sections in
1108 create_dynamic_sections, because they must be created
1109 before the linker maps input sections to output
1110 sections. The linker does that before
1111 adjust_dynamic_symbol is called, and it is that
1112 function which decides whether anything needs to go
1113 into these sections. */
1114 s->flags |= SEC_EXCLUDE;
1115 continue;
1116 }
1117
1118 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1119 continue;
1120
1121 /* Allocate memory for the section contents. */
1122 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1123 if (s->contents == NULL)
1124 return false;
1125 }
1126
1127 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
1128 }
1129
1130 /* This function is called via elf_vax_link_hash_traverse if we are
1131 creating a shared object with -Bsymbolic. It discards the space
1132 allocated to copy PC relative relocs against symbols which are defined
1133 in regular objects. We allocated space for them in the check_relocs
1134 routine, but we won't fill them in in the relocate_section routine. */
1135
1136 static bool
1137 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h,
1138 void * ignore ATTRIBUTE_UNUSED)
1139 {
1140 struct elf_vax_pcrel_relocs_copied *s;
1141
1142 /* We only discard relocs for symbols defined in a regular object. */
1143 if (!h->root.def_regular)
1144 return true;
1145
1146 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1147 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1148
1149 return true;
1150 }
1151
1152 /* This function is called via elf_link_hash_traverse. It looks for
1153 entries that have GOT or PLT (.GOT) references. If creating a shared
1154 object with -Bsymbolic, or the symbol has been forced local, then it
1155 resets the reference count back to -1 so normal PC32 relocation will
1156 be done. Otherwise space in the .got and .rela.got will be reserved
1157 for the symbol. */
1158
1159 static bool
1160 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, void * infoptr)
1161 {
1162 struct bfd_link_info *info = (struct bfd_link_info *) infoptr;
1163 bfd *dynobj;
1164 asection *sgot;
1165 asection *srelgot;
1166
1167 /* We don't care about non-GOT (and non-PLT) entries. */
1168 if (h->got.refcount <= 0 && h->plt.refcount <= 0)
1169 return true;
1170
1171 dynobj = elf_hash_table (info)->dynobj;
1172 BFD_ASSERT (dynobj != NULL);
1173
1174 sgot = elf_hash_table (info)->sgot;
1175 srelgot = elf_hash_table (info)->srelgot;
1176
1177 if (SYMBOL_REFERENCES_LOCAL (info, h))
1178 {
1179 h->got.refcount = -1;
1180 h->plt.refcount = -1;
1181 }
1182 else if (h->got.refcount > 0)
1183 {
1184 /* Make sure this symbol is output as a dynamic symbol. */
1185 if (h->dynindx == -1)
1186 {
1187 if (!bfd_elf_link_record_dynamic_symbol (info, h))
1188 return false;
1189 }
1190
1191 /* Allocate space in the .got and .rela.got sections. */
1192 sgot->size += 4;
1193 srelgot->size += sizeof (Elf32_External_Rela);
1194 }
1195
1196 return true;
1197 }
1198
1199 /* Relocate an VAX ELF section. */
1200
1201 static int
1202 elf_vax_relocate_section (bfd *output_bfd,
1203 struct bfd_link_info *info,
1204 bfd *input_bfd,
1205 asection *input_section,
1206 bfd_byte *contents,
1207 Elf_Internal_Rela *relocs,
1208 Elf_Internal_Sym *local_syms,
1209 asection **local_sections)
1210 {
1211 Elf_Internal_Shdr *symtab_hdr;
1212 struct elf_link_hash_entry **sym_hashes;
1213 bfd_vma plt_index;
1214 bfd_vma got_offset;
1215 asection *sgot;
1216 asection *splt;
1217 asection *sgotplt;
1218 asection *sreloc;
1219 Elf_Internal_Rela *rel;
1220 Elf_Internal_Rela *relend;
1221
1222 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1223 sym_hashes = elf_sym_hashes (input_bfd);
1224
1225 sgot = NULL;
1226 splt = NULL;
1227 sgotplt = NULL;
1228 sreloc = NULL;
1229
1230 rel = relocs;
1231 relend = relocs + input_section->reloc_count;
1232 for (; rel < relend; rel++)
1233 {
1234 int r_type;
1235 reloc_howto_type *howto;
1236 unsigned long r_symndx;
1237 struct elf_link_hash_entry *h;
1238 Elf_Internal_Sym *sym;
1239 asection *sec;
1240 bfd_vma relocation;
1241 bfd_reloc_status_type r;
1242
1243 r_type = ELF32_R_TYPE (rel->r_info);
1244 if (r_type < 0 || r_type >= (int) R_VAX_max)
1245 {
1246 bfd_set_error (bfd_error_bad_value);
1247 return false;
1248 }
1249 howto = howto_table + r_type;
1250
1251 r_symndx = ELF32_R_SYM (rel->r_info);
1252 h = NULL;
1253 sym = NULL;
1254 sec = NULL;
1255 if (r_symndx < symtab_hdr->sh_info)
1256 {
1257 sym = local_syms + r_symndx;
1258 sec = local_sections[r_symndx];
1259 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1260 }
1261 else
1262 {
1263 bool unresolved_reloc;
1264 bool warned, ignored;
1265
1266 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1267 r_symndx, symtab_hdr, sym_hashes,
1268 h, sec, relocation,
1269 unresolved_reloc, warned, ignored);
1270
1271 if ((h->root.type == bfd_link_hash_defined
1272 || h->root.type == bfd_link_hash_defweak)
1273 && ((r_type == R_VAX_PLT32
1274 && h->plt.offset != (bfd_vma) -1
1275 && !h->forced_local
1276 && elf_hash_table (info)->dynamic_sections_created)
1277 || (r_type == R_VAX_GOT32
1278 && h->got.offset != (bfd_vma) -1
1279 && !h->forced_local
1280 && elf_hash_table (info)->dynamic_sections_created
1281 && (! bfd_link_pic (info)
1282 || (! info->symbolic && h->dynindx != -1)
1283 || !h->def_regular))
1284 || (bfd_link_pic (info)
1285 && ((! info->symbolic && h->dynindx != -1)
1286 || !h->def_regular)
1287 && ((input_section->flags & SEC_ALLOC) != 0
1288 /* DWARF will emit R_VAX_32 relocations in its
1289 sections against symbols defined externally
1290 in shared libraries. We can't do anything
1291 with them here. */
1292
1293 || ((input_section->flags & SEC_DEBUGGING) != 0
1294 && h->def_dynamic))
1295 && (r_type == R_VAX_8
1296 || r_type == R_VAX_16
1297 || r_type == R_VAX_32))))
1298 /* In these cases, we don't need the relocation
1299 value. We check specially because in some
1300 obscure cases sec->output_section will be NULL. */
1301 relocation = 0;
1302 }
1303
1304 if (sec != NULL && discarded_section (sec))
1305 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1306 rel, 1, relend, howto, 0, contents);
1307
1308 if (bfd_link_relocatable (info))
1309 continue;
1310
1311 switch (r_type)
1312 {
1313 case R_VAX_GOT32:
1314 /* Relocation is to the address of the entry for this symbol
1315 in the global offset table. */
1316
1317 /* Resolve a GOTxx reloc against a local symbol directly,
1318 without using the global offset table. */
1319 if (h == NULL
1320 || h->got.offset == (bfd_vma) -1)
1321 break;
1322
1323 {
1324 bfd_vma off;
1325
1326 sgot = elf_hash_table (info)->sgot;
1327 BFD_ASSERT (sgot != NULL);
1328
1329 off = h->got.offset;
1330 BFD_ASSERT (off < sgot->size);
1331
1332 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off);
1333
1334 relocation = sgot->output_offset + off;
1335 /* The GOT relocation uses the addend. */
1336 rel->r_addend = 0;
1337
1338 /* Change the reference to be indirect. */
1339 contents[rel->r_offset - 1] |= 0x10;
1340 relocation += sgot->output_section->vma;
1341 }
1342 break;
1343
1344 case R_VAX_PC32:
1345 /* If we are creating an executable and the function this
1346 reloc refers to is in a shared lib, then we made a PLT
1347 entry for this symbol and need to handle the reloc like
1348 a PLT reloc. */
1349 if (bfd_link_pic (info))
1350 goto r_vax_pc32_shared;
1351 /* Fall through. */
1352 case R_VAX_PLT32:
1353 /* Relocation is to the entry for this symbol in the
1354 procedure linkage table. */
1355
1356 /* Resolve a PLTxx reloc against a local symbol directly,
1357 without using the procedure linkage table. */
1358 if (h == NULL
1359 || h->plt.offset == (bfd_vma) -1)
1360 break;
1361
1362 splt = elf_hash_table (info)->splt;
1363 BFD_ASSERT (splt != NULL);
1364
1365 sgotplt = elf_hash_table (info)->sgotplt;
1366 BFD_ASSERT (sgotplt != NULL);
1367
1368 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1369
1370 /* Get the offset into the .got table of the entry that
1371 corresponds to this function. Each .got entry is 4 bytes.
1372 The first two are reserved. */
1373 got_offset = (plt_index + 3) * 4;
1374
1375 /* We want the relocation to point into the .got.plt instead
1376 of the plt itself. */
1377 relocation = (sgotplt->output_section->vma
1378 + sgotplt->output_offset
1379 + got_offset);
1380 contents[rel->r_offset-1] |= 0x10; /* make indirect */
1381 if (rel->r_addend == 2)
1382 {
1383 h->plt.offset |= 1;
1384 }
1385 else if (rel->r_addend != 0)
1386 _bfd_error_handler
1387 /* xgettext:c-format */
1388 (_("%pB: warning: PLT addend of %" PRId64 " to `%s'"
1389 " from %pA section ignored"),
1390 input_bfd, (int64_t) rel->r_addend, h->root.root.string,
1391 input_section);
1392 rel->r_addend = 0;
1393
1394 break;
1395
1396 case R_VAX_PC8:
1397 case R_VAX_PC16:
1398 r_vax_pc32_shared:
1399 if (h == NULL
1400 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1401 || h->forced_local)
1402 break;
1403 /* Fall through. */
1404 case R_VAX_8:
1405 case R_VAX_16:
1406 case R_VAX_32:
1407 if (bfd_link_pic (info)
1408 && r_symndx != STN_UNDEF
1409 && (input_section->flags & SEC_ALLOC) != 0
1410 && ((r_type != R_VAX_PC8
1411 && r_type != R_VAX_PC16
1412 && r_type != R_VAX_PC32)
1413 || ((input_section->flags & SEC_CODE)
1414 && (!info->symbolic
1415 || (!h->def_regular && h->type != STT_SECTION)))))
1416 {
1417 Elf_Internal_Rela outrel;
1418 bfd_byte *loc;
1419 bool skip, relocate;
1420
1421 /* When generating a shared object, these relocations
1422 are copied into the output file to be resolved at run
1423 time. */
1424 if (sreloc == NULL)
1425 {
1426 sreloc = _bfd_elf_get_dynamic_reloc_section
1427 (input_bfd, input_section, /*rela?*/ true);
1428 if (sreloc == NULL)
1429 return false;
1430 }
1431
1432 skip = false;
1433 relocate = false;
1434
1435 outrel.r_offset =
1436 _bfd_elf_section_offset (output_bfd, info, input_section,
1437 rel->r_offset);
1438 if (outrel.r_offset == (bfd_vma) -1)
1439 skip = true;
1440 if (outrel.r_offset == (bfd_vma) -2)
1441 skip = true, relocate = true;
1442 outrel.r_offset += (input_section->output_section->vma
1443 + input_section->output_offset);
1444
1445 if (skip)
1446 memset (&outrel, 0, sizeof outrel);
1447 /* h->dynindx may be -1 if the symbol was marked to
1448 become local. */
1449 else if (h != NULL
1450 && ((! info->symbolic && h->dynindx != -1)
1451 || !h->def_regular))
1452 {
1453 BFD_ASSERT (h->dynindx != -1);
1454 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1455 outrel.r_addend = relocation + rel->r_addend;
1456 }
1457 else
1458 {
1459 if (r_type == R_VAX_32)
1460 {
1461 relocate = true;
1462 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE);
1463 BFD_ASSERT (bfd_get_signed_32 (input_bfd,
1464 &contents[rel->r_offset]) == 0);
1465 outrel.r_addend = relocation + rel->r_addend;
1466 }
1467 else
1468 {
1469 long indx;
1470
1471 if (bfd_is_abs_section (sec))
1472 indx = 0;
1473 else if (sec == NULL || sec->owner == NULL)
1474 {
1475 bfd_set_error (bfd_error_bad_value);
1476 return false;
1477 }
1478 else
1479 {
1480 asection *osec;
1481
1482 /* We are turning this relocation into one
1483 against a section symbol. It would be
1484 proper to subtract the symbol's value,
1485 osec->vma, from the emitted reloc addend,
1486 but ld.so expects buggy relocs. */
1487 osec = sec->output_section;
1488 indx = elf_section_data (osec)->dynindx;
1489 if (indx == 0)
1490 {
1491 struct elf_link_hash_table *htab;
1492 htab = elf_hash_table (info);
1493 osec = htab->text_index_section;
1494 indx = elf_section_data (osec)->dynindx;
1495 }
1496 BFD_ASSERT (indx != 0);
1497 }
1498
1499 outrel.r_info = ELF32_R_INFO (indx, r_type);
1500 outrel.r_addend = relocation + rel->r_addend;
1501 }
1502 }
1503
1504 if ((input_section->flags & SEC_CODE) != 0
1505 || (ELF32_R_TYPE (outrel.r_info) != R_VAX_32
1506 && ELF32_R_TYPE (outrel.r_info) != R_VAX_RELATIVE
1507 && ELF32_R_TYPE (outrel.r_info) != R_VAX_COPY
1508 && ELF32_R_TYPE (outrel.r_info) != R_VAX_JMP_SLOT
1509 && ELF32_R_TYPE (outrel.r_info) != R_VAX_GLOB_DAT))
1510 {
1511 if (h != NULL)
1512 _bfd_error_handler
1513 /* xgettext:c-format */
1514 (_("%pB: warning: %s relocation against symbol `%s'"
1515 " from %pA section"),
1516 input_bfd, howto->name, h->root.root.string,
1517 input_section);
1518 else
1519 _bfd_error_handler
1520 /* xgettext:c-format */
1521 (_("%pB: warning: %s relocation to %#" PRIx64
1522 " from %pA section"),
1523 input_bfd, howto->name, (uint64_t) outrel.r_addend,
1524 input_section);
1525 }
1526 loc = sreloc->contents;
1527 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1528 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1529
1530 /* This reloc will be computed at runtime, so there's no
1531 need to do anything now, except for R_VAX_32
1532 relocations that have been turned into
1533 R_VAX_RELATIVE. */
1534 if (!relocate)
1535 continue;
1536 }
1537
1538 break;
1539
1540 case R_VAX_GNU_VTINHERIT:
1541 case R_VAX_GNU_VTENTRY:
1542 /* These are no-ops in the end. */
1543 continue;
1544
1545 default:
1546 break;
1547 }
1548
1549 /* VAX PCREL relocations are from the end of relocation, not the start.
1550 So subtract the difference from the relocation amount since we can't
1551 add it to the offset. */
1552 if (howto->pc_relative && howto->pcrel_offset)
1553 relocation -= bfd_get_reloc_size(howto);
1554
1555 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1556 contents, rel->r_offset,
1557 relocation, rel->r_addend);
1558
1559 if (r != bfd_reloc_ok)
1560 {
1561 switch (r)
1562 {
1563 default:
1564 case bfd_reloc_outofrange:
1565 abort ();
1566 case bfd_reloc_overflow:
1567 {
1568 const char *name;
1569
1570 if (h != NULL)
1571 name = NULL;
1572 else
1573 {
1574 name = bfd_elf_string_from_elf_section (input_bfd,
1575 symtab_hdr->sh_link,
1576 sym->st_name);
1577 if (name == NULL)
1578 return false;
1579 if (*name == '\0')
1580 name = bfd_section_name (sec);
1581 }
1582 info->callbacks->reloc_overflow
1583 (info, (h ? &h->root : NULL), name, howto->name,
1584 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1585 }
1586 break;
1587 }
1588 }
1589 }
1590
1591 return true;
1592 }
1593
1594 /* Finish up dynamic symbol handling. We set the contents of various
1595 dynamic sections here. */
1596
1597 static bool
1598 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info,
1599 struct elf_link_hash_entry *h,
1600 Elf_Internal_Sym *sym)
1601 {
1602 bfd *dynobj;
1603
1604 dynobj = elf_hash_table (info)->dynobj;
1605
1606 if (h->plt.offset != (bfd_vma) -1)
1607 {
1608 asection *splt;
1609 asection *sgot;
1610 asection *srela;
1611 bfd_vma plt_index;
1612 bfd_vma got_offset;
1613 bfd_vma addend;
1614 Elf_Internal_Rela rela;
1615 bfd_byte *loc;
1616
1617 /* This symbol has an entry in the procedure linkage table. Set
1618 it up. */
1619 BFD_ASSERT (h->dynindx != -1);
1620
1621 splt = elf_hash_table (info)->splt;
1622 sgot = elf_hash_table (info)->sgotplt;
1623 srela = elf_hash_table (info)->srelplt;
1624 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1625
1626 addend = 2 * (h->plt.offset & 1);
1627 h->plt.offset &= ~1;
1628
1629 /* Get the index in the procedure linkage table which
1630 corresponds to this symbol. This is the index of this symbol
1631 in all the symbols for which we are making plt entries. The
1632 first entry in the procedure linkage table is reserved. */
1633 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1634
1635 /* Get the offset into the .got table of the entry that
1636 corresponds to this function. Each .got entry is 4 bytes.
1637 The first two are reserved. */
1638 got_offset = (plt_index + 3) * 4;
1639
1640 /* Fill in the entry in the procedure linkage table. */
1641 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry,
1642 PLT_ENTRY_SIZE);
1643
1644 /* The offset is relative to the first extension word. */
1645 bfd_put_32 (output_bfd,
1646 -(h->plt.offset + 8),
1647 splt->contents + h->plt.offset + 4);
1648
1649 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1650 splt->contents + h->plt.offset + 8);
1651
1652 /* Fill in the entry in the global offset table. */
1653 bfd_put_32 (output_bfd,
1654 (splt->output_section->vma
1655 + splt->output_offset
1656 + h->plt.offset) + addend,
1657 sgot->contents + got_offset);
1658
1659 /* Fill in the entry in the .rela.plt section. */
1660 rela.r_offset = (sgot->output_section->vma
1661 + sgot->output_offset
1662 + got_offset);
1663 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT);
1664 rela.r_addend = addend;
1665 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1666 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1667
1668 if (!h->def_regular)
1669 {
1670 /* Mark the symbol as undefined, rather than as defined in
1671 the .plt section. Leave the value alone. */
1672 sym->st_shndx = SHN_UNDEF;
1673 }
1674 }
1675
1676 if (h->got.offset != (bfd_vma) -1)
1677 {
1678 asection *sgot;
1679 asection *srela;
1680 Elf_Internal_Rela rela;
1681 bfd_byte *loc;
1682
1683 /* This symbol has an entry in the global offset table. Set it
1684 up. */
1685 sgot = elf_hash_table (info)->sgot;
1686 srela = elf_hash_table (info)->srelgot;
1687 BFD_ASSERT (sgot != NULL && srela != NULL);
1688
1689 rela.r_offset = (sgot->output_section->vma
1690 + sgot->output_offset
1691 + h->got.offset);
1692 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT);
1693 rela.r_addend = bfd_get_signed_32 (output_bfd,
1694 sgot->contents + h->got.offset);
1695
1696 loc = srela->contents;
1697 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1698 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1699 }
1700
1701 if (h->needs_copy)
1702 {
1703 asection *s;
1704 Elf_Internal_Rela rela;
1705 bfd_byte *loc;
1706
1707 /* This symbol needs a copy reloc. Set it up. */
1708 BFD_ASSERT (h->dynindx != -1
1709 && (h->root.type == bfd_link_hash_defined
1710 || h->root.type == bfd_link_hash_defweak));
1711
1712 s = bfd_get_linker_section (dynobj, ".rela.bss");
1713 BFD_ASSERT (s != NULL);
1714
1715 rela.r_offset = (h->root.u.def.value
1716 + h->root.u.def.section->output_section->vma
1717 + h->root.u.def.section->output_offset);
1718 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY);
1719 rela.r_addend = 0;
1720 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1721 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1722 }
1723
1724 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1725 if (h == elf_hash_table (info)->hdynamic
1726 || h == elf_hash_table (info)->hgot)
1727 sym->st_shndx = SHN_ABS;
1728
1729 return true;
1730 }
1731
1732 /* Finish up the dynamic sections. */
1733
1734 static bool
1735 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1736 {
1737 bfd *dynobj;
1738 asection *sgot;
1739 asection *sdyn;
1740
1741 dynobj = elf_hash_table (info)->dynobj;
1742
1743 sgot = elf_hash_table (info)->sgotplt;
1744 BFD_ASSERT (sgot != NULL);
1745 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
1746
1747 if (elf_hash_table (info)->dynamic_sections_created)
1748 {
1749 asection *splt;
1750 Elf32_External_Dyn *dyncon, *dynconend;
1751
1752 splt = elf_hash_table (info)->splt;
1753 BFD_ASSERT (splt != NULL && sdyn != NULL);
1754
1755 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1756 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
1757 for (; dyncon < dynconend; dyncon++)
1758 {
1759 Elf_Internal_Dyn dyn;
1760 asection *s;
1761
1762 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1763
1764 switch (dyn.d_tag)
1765 {
1766 default:
1767 break;
1768
1769 case DT_PLTGOT:
1770 s = elf_hash_table (info)->sgotplt;
1771 goto get_vma;
1772 case DT_JMPREL:
1773 s = elf_hash_table (info)->srelplt;
1774 get_vma:
1775 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
1776 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1777 break;
1778
1779 case DT_PLTRELSZ:
1780 s = elf_hash_table (info)->srelplt;
1781 dyn.d_un.d_val = s->size;
1782 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1783 break;
1784 }
1785 }
1786
1787 /* Fill in the first entry in the procedure linkage table. */
1788 if (splt->size > 0)
1789 {
1790 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE);
1791 bfd_put_32 (output_bfd,
1792 (sgot->output_section->vma
1793 + sgot->output_offset + 4
1794 - (splt->output_section->vma + 6)),
1795 splt->contents + 2);
1796 bfd_put_32 (output_bfd,
1797 (sgot->output_section->vma
1798 + sgot->output_offset + 8
1799 - (splt->output_section->vma + 12)),
1800 splt->contents + 8);
1801 elf_section_data (splt->output_section)->this_hdr.sh_entsize
1802 = PLT_ENTRY_SIZE;
1803 }
1804 }
1805
1806 /* Fill in the first three entries in the global offset table. */
1807 if (sgot->size > 0)
1808 {
1809 if (sdyn == NULL)
1810 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1811 else
1812 bfd_put_32 (output_bfd,
1813 sdyn->output_section->vma + sdyn->output_offset,
1814 sgot->contents);
1815 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1816 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1817 }
1818
1819 if (elf_section_data (sgot->output_section) != NULL)
1820 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1821
1822 return true;
1823 }
1824
1825 static enum elf_reloc_type_class
1826 elf_vax_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
1827 const asection *rel_sec ATTRIBUTE_UNUSED,
1828 const Elf_Internal_Rela *rela)
1829 {
1830 switch ((int) ELF32_R_TYPE (rela->r_info))
1831 {
1832 case R_VAX_RELATIVE:
1833 return reloc_class_relative;
1834 case R_VAX_JMP_SLOT:
1835 return reloc_class_plt;
1836 case R_VAX_COPY:
1837 return reloc_class_copy;
1838 default:
1839 return reloc_class_normal;
1840 }
1841 }
1842
1843 static bfd_vma
1844 elf_vax_plt_sym_val (bfd_vma i, const asection *plt,
1845 const arelent *rel ATTRIBUTE_UNUSED)
1846 {
1847 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
1848 }
1849
1850 #define TARGET_LITTLE_SYM vax_elf32_vec
1851 #define TARGET_LITTLE_NAME "elf32-vax"
1852 #define ELF_MACHINE_CODE EM_VAX
1853 #define ELF_MAXPAGESIZE 0x1000
1854
1855 #define elf_backend_create_dynamic_sections \
1856 _bfd_elf_create_dynamic_sections
1857 #define bfd_elf32_bfd_link_hash_table_create \
1858 elf_vax_link_hash_table_create
1859 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
1860
1861 #define elf_backend_check_relocs elf_vax_check_relocs
1862 #define elf_backend_adjust_dynamic_symbol \
1863 elf_vax_adjust_dynamic_symbol
1864 #define elf_backend_always_size_sections \
1865 elf_vax_always_size_sections
1866 #define elf_backend_size_dynamic_sections \
1867 elf_vax_size_dynamic_sections
1868 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
1869 #define elf_backend_relocate_section elf_vax_relocate_section
1870 #define elf_backend_finish_dynamic_symbol \
1871 elf_vax_finish_dynamic_symbol
1872 #define elf_backend_finish_dynamic_sections \
1873 elf_vax_finish_dynamic_sections
1874 #define elf_backend_reloc_type_class elf_vax_reloc_type_class
1875 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook
1876 #define elf_backend_plt_sym_val elf_vax_plt_sym_val
1877 #define bfd_elf32_bfd_merge_private_bfd_data \
1878 elf32_vax_merge_private_bfd_data
1879 #define bfd_elf32_bfd_set_private_flags \
1880 elf32_vax_set_private_flags
1881 #define bfd_elf32_bfd_print_private_bfd_data \
1882 elf32_vax_print_private_bfd_data
1883
1884 #define elf_backend_can_gc_sections 1
1885 #define elf_backend_want_got_plt 1
1886 #define elf_backend_plt_readonly 1
1887 #define elf_backend_want_plt_sym 0
1888 #define elf_backend_got_header_size 16
1889 #define elf_backend_rela_normal 1
1890 #define elf_backend_dtrel_excludes_plt 1
1891
1892 #include "elf32-target.h"
The GNU Binutils are a collection of binary tools.