1 /* VAX series support for 32-bit ELF
2 Copyright (C) 1993-2024 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 int elf_vax_relocate_section (bfd *, struct bfd_link_info *,
40 bfd *, asection *, bfd_byte *,
41 Elf_Internal_Rela *,
42 Elf_Internal_Sym *, asection **);
43 static bool elf_vax_finish_dynamic_symbol (bfd *, struct bfd_link_info *,
44 struct elf_link_hash_entry *,
45 Elf_Internal_Sym *);
46 static bool elf_vax_finish_dynamic_sections (bfd *, struct bfd_link_info *);
47 static bfd_vma elf_vax_plt_sym_val (bfd_vma, const asection *,
48 const arelent *);
49
50 static bool elf32_vax_set_private_flags (bfd *, flagword);
51 static bool elf32_vax_print_private_bfd_data (bfd *, void *);
52
53 static reloc_howto_type howto_table[] = {
54 HOWTO (R_VAX_NONE, /* type */
55 0, /* rightshift */
56 0, /* size */
57 0, /* bitsize */
58 false, /* pc_relative */
59 0, /* bitpos */
60 complain_overflow_dont, /* complain_on_overflow */
61 bfd_elf_generic_reloc, /* special_function */
62 "R_VAX_NONE", /* name */
63 false, /* partial_inplace */
64 0, /* src_mask */
65 0x00000000, /* dst_mask */
66 false), /* pcrel_offset */
67
68 HOWTO (R_VAX_32, /* type */
69 0, /* rightshift */
70 4, /* size */
71 32, /* bitsize */
72 false, /* pc_relative */
73 0, /* bitpos */
74 complain_overflow_bitfield, /* complain_on_overflow */
75 bfd_elf_generic_reloc, /* special_function */
76 "R_VAX_32", /* name */
77 false, /* partial_inplace */
78 0, /* src_mask */
79 0xffffffff, /* dst_mask */
80 false), /* pcrel_offset */
81
82 HOWTO (R_VAX_16, /* type */
83 0, /* rightshift */
84 2, /* size */
85 16, /* bitsize */
86 false, /* pc_relative */
87 0, /* bitpos */
88 complain_overflow_bitfield, /* complain_on_overflow */
89 bfd_elf_generic_reloc, /* special_function */
90 "R_VAX_16", /* name */
91 false, /* partial_inplace */
92 0, /* src_mask */
93 0x0000ffff, /* dst_mask */
94 false), /* pcrel_offset */
95
96 HOWTO (R_VAX_8, /* type */
97 0, /* rightshift */
98 1, /* size */
99 8, /* bitsize */
100 false, /* pc_relative */
101 0, /* bitpos */
102 complain_overflow_bitfield, /* complain_on_overflow */
103 bfd_elf_generic_reloc, /* special_function */
104 "R_VAX_8", /* name */
105 false, /* partial_inplace */
106 0, /* src_mask */
107 0x000000ff, /* dst_mask */
108 false), /* pcrel_offset */
109
110 HOWTO (R_VAX_PC32, /* type */
111 0, /* rightshift */
112 4, /* size */
113 32, /* bitsize */
114 true, /* pc_relative */
115 0, /* bitpos */
116 complain_overflow_bitfield, /* complain_on_overflow */
117 bfd_elf_generic_reloc, /* special_function */
118 "R_VAX_PC32", /* name */
119 false, /* partial_inplace */
120 0, /* src_mask */
121 0xffffffff, /* dst_mask */
122 true), /* pcrel_offset */
123
124 HOWTO (R_VAX_PC16, /* type */
125 0, /* rightshift */
126 2, /* size */
127 16, /* bitsize */
128 true, /* pc_relative */
129 0, /* bitpos */
130 complain_overflow_signed, /* complain_on_overflow */
131 bfd_elf_generic_reloc, /* special_function */
132 "R_VAX_PC16", /* name */
133 false, /* partial_inplace */
134 0, /* src_mask */
135 0x0000ffff, /* dst_mask */
136 true), /* pcrel_offset */
137
138 HOWTO (R_VAX_PC8, /* type */
139 0, /* rightshift */
140 1, /* size */
141 8, /* bitsize */
142 true, /* pc_relative */
143 0, /* bitpos */
144 complain_overflow_signed, /* complain_on_overflow */
145 bfd_elf_generic_reloc, /* special_function */
146 "R_VAX_PC8", /* name */
147 false, /* partial_inplace */
148 0, /* src_mask */
149 0x000000ff, /* dst_mask */
150 true), /* pcrel_offset */
151
152 HOWTO (R_VAX_GOT32, /* type */
153 0, /* rightshift */
154 4, /* size */
155 32, /* bitsize */
156 true, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_bitfield, /* complain_on_overflow */
159 bfd_elf_generic_reloc, /* special_function */
160 "R_VAX_GOT32", /* name */
161 false, /* partial_inplace */
162 0, /* src_mask */
163 0xffffffff, /* dst_mask */
164 true), /* pcrel_offset */
165
166 EMPTY_HOWTO (-1),
167 EMPTY_HOWTO (-1),
168 EMPTY_HOWTO (-1),
169 EMPTY_HOWTO (-1),
170 EMPTY_HOWTO (-1),
171
172 HOWTO (R_VAX_PLT32, /* type */
173 0, /* rightshift */
174 4, /* size */
175 32, /* bitsize */
176 true, /* pc_relative */
177 0, /* bitpos */
178 complain_overflow_bitfield, /* complain_on_overflow */
179 bfd_elf_generic_reloc, /* special_function */
180 "R_VAX_PLT32", /* name */
181 false, /* partial_inplace */
182 0, /* src_mask */
183 0xffffffff, /* dst_mask */
184 true), /* pcrel_offset */
185
186 EMPTY_HOWTO (-1),
187 EMPTY_HOWTO (-1),
188 EMPTY_HOWTO (-1),
189 EMPTY_HOWTO (-1),
190 EMPTY_HOWTO (-1),
191
192 HOWTO (R_VAX_COPY, /* type */
193 0, /* rightshift */
194 0, /* size */
195 0, /* bitsize */
196 false, /* pc_relative */
197 0, /* bitpos */
198 complain_overflow_dont, /* complain_on_overflow */
199 bfd_elf_generic_reloc, /* special_function */
200 "R_VAX_COPY", /* name */
201 false, /* partial_inplace */
202 0, /* src_mask */
203 0xffffffff, /* dst_mask */
204 false), /* pcrel_offset */
205
206 HOWTO (R_VAX_GLOB_DAT, /* type */
207 0, /* rightshift */
208 4, /* size */
209 32, /* bitsize */
210 false, /* pc_relative */
211 0, /* bitpos */
212 complain_overflow_dont, /* complain_on_overflow */
213 bfd_elf_generic_reloc, /* special_function */
214 "R_VAX_GLOB_DAT", /* name */
215 false, /* partial_inplace */
216 0, /* src_mask */
217 0xffffffff, /* dst_mask */
218 false), /* pcrel_offset */
219
220 HOWTO (R_VAX_JMP_SLOT, /* type */
221 0, /* rightshift */
222 4, /* size */
223 32, /* bitsize */
224 false, /* pc_relative */
225 0, /* bitpos */
226 complain_overflow_dont, /* complain_on_overflow */
227 bfd_elf_generic_reloc, /* special_function */
228 "R_VAX_JMP_SLOT", /* name */
229 false, /* partial_inplace */
230 0, /* src_mask */
231 0xffffffff, /* dst_mask */
232 false), /* pcrel_offset */
233
234 HOWTO (R_VAX_RELATIVE, /* type */
235 0, /* rightshift */
236 4, /* size */
237 32, /* bitsize */
238 false, /* pc_relative */
239 0, /* bitpos */
240 complain_overflow_dont, /* complain_on_overflow */
241 bfd_elf_generic_reloc, /* special_function */
242 "R_VAX_RELATIVE", /* name */
243 false, /* partial_inplace */
244 0, /* src_mask */
245 0xffffffff, /* dst_mask */
246 false), /* pcrel_offset */
247
248 /* GNU extension to record C++ vtable hierarchy */
249 HOWTO (R_VAX_GNU_VTINHERIT, /* type */
250 0, /* rightshift */
251 4, /* size */
252 0, /* bitsize */
253 false, /* pc_relative */
254 0, /* bitpos */
255 complain_overflow_dont, /* complain_on_overflow */
256 NULL, /* special_function */
257 "R_VAX_GNU_VTINHERIT", /* name */
258 false, /* partial_inplace */
259 0, /* src_mask */
260 0, /* dst_mask */
261 false), /* pcrel_offset */
262
263 /* GNU extension to record C++ vtable member usage */
264 HOWTO (R_VAX_GNU_VTENTRY, /* type */
265 0, /* rightshift */
266 4, /* size */
267 0, /* bitsize */
268 false, /* pc_relative */
269 0, /* bitpos */
270 complain_overflow_dont, /* complain_on_overflow */
271 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
272 "R_VAX_GNU_VTENTRY", /* name */
273 false, /* partial_inplace */
274 0, /* src_mask */
275 0, /* dst_mask */
276 false), /* pcrel_offset */
277 };
278
279 static bool
rtype_to_howto(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)280 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst)
281 {
282 unsigned int r_type;
283
284 r_type = ELF32_R_TYPE (dst->r_info);
285 if (r_type >= R_VAX_max)
286 {
287 /* xgettext:c-format */
288 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
289 abfd, r_type);
290 bfd_set_error (bfd_error_bad_value);
291 return false;
292 }
293 cache_ptr->howto = &howto_table[r_type];
294 return true;
295 }
296
297 #define elf_info_to_howto rtype_to_howto
298
299 static const struct
300 {
301 bfd_reloc_code_real_type bfd_val;
302 int elf_val;
303 } reloc_map[] = {
304 { BFD_RELOC_NONE, R_VAX_NONE },
305 { BFD_RELOC_32, R_VAX_32 },
306 { BFD_RELOC_16, R_VAX_16 },
307 { BFD_RELOC_8, R_VAX_8 },
308 { BFD_RELOC_32_PCREL, R_VAX_PC32 },
309 { BFD_RELOC_16_PCREL, R_VAX_PC16 },
310 { BFD_RELOC_8_PCREL, R_VAX_PC8 },
311 { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 },
312 { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 },
313 { BFD_RELOC_NONE, R_VAX_COPY },
314 { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT },
315 { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT },
316 { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE },
317 { BFD_RELOC_CTOR, R_VAX_32 },
318 { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT },
319 { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY },
320 };
321
322 static reloc_howto_type *
reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)323 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code)
324 {
325 unsigned int i;
326 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
327 {
328 if (reloc_map[i].bfd_val == code)
329 return &howto_table[reloc_map[i].elf_val];
330 }
331 return 0;
332 }
333
334 static reloc_howto_type *
reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)335 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
336 const char *r_name)
337 {
338 unsigned int i;
339
340 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++)
341 if (howto_table[i].name != NULL
342 && strcasecmp (howto_table[i].name, r_name) == 0)
343 return &howto_table[i];
344
345 return NULL;
346 }
347
348 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
349 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup
350 #define ELF_ARCH bfd_arch_vax
351 /* end code generated by elf.el */
352
353 /* Functions for the VAX ELF linker. */
354
355 /* The name of the dynamic interpreter. This is put in the .interp
356 section. */
357
358 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so"
359
360 /* The size in bytes of an entry in the procedure linkage table. */
361
362 #define PLT_ENTRY_SIZE 12
363
364 /* The first entry in a procedure linkage table looks like this. See
365 the SVR4 ABI VAX supplement to see how this works. */
366
367 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] =
368 {
369 0xdd, 0xef, /* pushl l^ */
370 0, 0, 0, 0, /* offset to .plt.got + 4 */
371 0x17, 0xff, /* jmp @L^(pc) */
372 0, 0, 0, 0, /* offset to .plt.got + 8 */
373 };
374
375 /* Subsequent entries in a procedure linkage table look like this. */
376
377 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] =
378 {
379 0xfc, 0x0f, /* .word ^M<r11:r2> */
380 0x16, 0xef, /* jsb L^(pc) */
381 0, 0, 0, 0, /* replaced with offset to start of .plt */
382 0, 0, 0, 0, /* index into .rela.plt */
383 };
384
385 /* The VAX linker needs to keep track of the number of relocs that it
386 decides to copy in check_relocs for each symbol. This is so that it
387 can discard PC relative relocs if it doesn't need them when linking
388 with -Bsymbolic. We store the information in a field extending the
389 regular ELF linker hash table. */
390
391 /* This structure keeps track of the number of PC relative relocs we have
392 copied for a given symbol. */
393
394 struct elf_vax_pcrel_relocs_copied
395 {
396 /* Next section. */
397 struct elf_vax_pcrel_relocs_copied *next;
398 /* A section in dynobj. */
399 asection *section;
400 /* Number of relocs copied in this section. */
401 bfd_size_type count;
402 };
403
404 /* VAX ELF linker hash entry. */
405
406 struct elf_vax_link_hash_entry
407 {
408 struct elf_link_hash_entry root;
409
410 /* Number of PC relative relocs copied for this symbol. */
411 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied;
412
413 bfd_vma got_addend;
414 };
415
416 /* Declare this now that the above structures are defined. */
417
418 static bool elf_vax_discard_copies (struct elf_vax_link_hash_entry *,
419 void *);
420
421 /* Declare this now that the above structures are defined. */
422
423 static bool elf_vax_instantiate_got_entries (struct elf_link_hash_entry *,
424 void *);
425
426 /* Traverse an VAX ELF linker hash table. */
427
428 #define elf_vax_link_hash_traverse(table, func, info) \
429 (elf_link_hash_traverse \
430 ((table), \
431 (bool (*) (struct elf_link_hash_entry *, void *)) (func), \
432 (info)))
433
434 /* Create an entry in an VAX ELF linker hash table. */
435
436 static struct bfd_hash_entry *
elf_vax_link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)437 elf_vax_link_hash_newfunc (struct bfd_hash_entry *entry,
438 struct bfd_hash_table *table,
439 const char *string)
440 {
441 struct elf_vax_link_hash_entry *ret =
442 (struct elf_vax_link_hash_entry *) entry;
443
444 /* Allocate the structure if it has not already been allocated by a
445 subclass. */
446 if (ret == NULL)
447 ret = ((struct elf_vax_link_hash_entry *)
448 bfd_hash_allocate (table,
449 sizeof (struct elf_vax_link_hash_entry)));
450 if (ret == NULL)
451 return (struct bfd_hash_entry *) ret;
452
453 /* Call the allocation method of the superclass. */
454 ret = ((struct elf_vax_link_hash_entry *)
455 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
456 table, string));
457 if (ret != NULL)
458 {
459 ret->pcrel_relocs_copied = NULL;
460 }
461
462 return (struct bfd_hash_entry *) ret;
463 }
464
465 /* Create an VAX ELF linker hash table. */
466
467 static struct bfd_link_hash_table *
elf_vax_link_hash_table_create(bfd * abfd)468 elf_vax_link_hash_table_create (bfd *abfd)
469 {
470 struct elf_link_hash_table *ret;
471 size_t amt = sizeof (struct elf_link_hash_table);
472
473 ret = bfd_zmalloc (amt);
474 if (ret == NULL)
475 return NULL;
476
477 if (!_bfd_elf_link_hash_table_init (ret, abfd,
478 elf_vax_link_hash_newfunc,
479 sizeof (struct elf_vax_link_hash_entry),
480 GENERIC_ELF_DATA))
481 {
482 free (ret);
483 return NULL;
484 }
485
486 return &ret->root;
487 }
488
489 /* Keep vax-specific flags in the ELF header */
490 static bool
elf32_vax_set_private_flags(bfd * abfd,flagword flags)491 elf32_vax_set_private_flags (bfd *abfd, flagword flags)
492 {
493 elf_elfheader (abfd)->e_flags = flags;
494 elf_flags_init (abfd) = true;
495 return true;
496 }
497
498 /* Merge backend specific data from an object file to the output
499 object file when linking. */
500 static bool
elf32_vax_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)501 elf32_vax_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
502 {
503 bfd *obfd = info->output_bfd;
504 flagword in_flags;
505
506 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
507 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
508 return true;
509
510 in_flags = elf_elfheader (ibfd)->e_flags;
511
512 if (!elf_flags_init (obfd))
513 {
514 elf_flags_init (obfd) = true;
515 elf_elfheader (obfd)->e_flags = in_flags;
516 }
517
518 return true;
519 }
520
521 /* Display the flags field */
522 static bool
elf32_vax_print_private_bfd_data(bfd * abfd,void * ptr)523 elf32_vax_print_private_bfd_data (bfd *abfd, void * ptr)
524 {
525 FILE *file = (FILE *) ptr;
526
527 BFD_ASSERT (abfd != NULL && ptr != NULL);
528
529 /* Print normal ELF private data. */
530 _bfd_elf_print_private_bfd_data (abfd, ptr);
531
532 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
533
534 /* xgettext:c-format */
535 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
536
537 if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC)
538 fprintf (file, _(" [nonpic]"));
539
540 if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT)
541 fprintf (file, _(" [d-float]"));
542
543 if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT)
544 fprintf (file, _(" [g-float]"));
545
546 fputc ('\n', file);
547
548 return true;
549 }
550 /* Look through the relocs for a section during the first phase, and
551 allocate space in the global offset table or procedure linkage
552 table. */
553
554 static bool
elf_vax_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)555 elf_vax_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec,
556 const Elf_Internal_Rela *relocs)
557 {
558 bfd *dynobj;
559 Elf_Internal_Shdr *symtab_hdr;
560 struct elf_link_hash_entry **sym_hashes;
561 const Elf_Internal_Rela *rel;
562 const Elf_Internal_Rela *rel_end;
563 asection *sreloc;
564
565 if (bfd_link_relocatable (info))
566 return true;
567
568 dynobj = elf_hash_table (info)->dynobj;
569 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
570 sym_hashes = elf_sym_hashes (abfd);
571
572 sreloc = NULL;
573
574 rel_end = relocs + sec->reloc_count;
575 for (rel = relocs; rel < rel_end; rel++)
576 {
577 unsigned long r_symndx;
578 struct elf_link_hash_entry *h;
579
580 r_symndx = ELF32_R_SYM (rel->r_info);
581
582 if (r_symndx < symtab_hdr->sh_info)
583 h = NULL;
584 else
585 {
586 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
587 while (h->root.type == bfd_link_hash_indirect
588 || h->root.type == bfd_link_hash_warning)
589 h = (struct elf_link_hash_entry *) h->root.u.i.link;
590 }
591
592 switch (ELF32_R_TYPE (rel->r_info))
593 {
594 case R_VAX_GOT32:
595 BFD_ASSERT (h != NULL);
596
597 /* If this is a local symbol, we resolve it directly without
598 creating a global offset table entry. */
599 if (SYMBOL_REFERENCES_LOCAL (info, h)
600 || h == elf_hash_table (info)->hgot
601 || h == elf_hash_table (info)->hplt)
602 break;
603
604 /* This symbol requires a global offset table entry. */
605
606 if (dynobj == NULL)
607 {
608 /* Create the .got section. */
609 elf_hash_table (info)->dynobj = dynobj = abfd;
610 if (!_bfd_elf_create_got_section (dynobj, info))
611 return false;
612 }
613
614 if (h != NULL)
615 {
616 struct elf_vax_link_hash_entry *eh;
617
618 eh = (struct elf_vax_link_hash_entry *) h;
619 if (h->got.refcount == -1)
620 {
621 h->got.refcount = 1;
622 eh->got_addend = rel->r_addend;
623 }
624 else
625 {
626 h->got.refcount++;
627 if (eh->got_addend != (bfd_vma) rel->r_addend)
628 _bfd_error_handler
629 /* xgettext:c-format */
630 (_("%pB: warning: GOT addend of %" PRId64 " to `%s' does"
631 " not match previous GOT addend of %" PRId64),
632 abfd, (int64_t) rel->r_addend, h->root.root.string,
633 (int64_t) eh->got_addend);
634
635 }
636 }
637 break;
638
639 case R_VAX_PLT32:
640 /* This symbol requires a procedure linkage table entry. We
641 actually build the entry in adjust_dynamic_symbol,
642 because this might be a case of linking PIC code which is
643 never referenced by a dynamic object, in which case we
644 don't need to generate a procedure linkage table entry
645 after all. */
646 BFD_ASSERT (h != NULL);
647
648 /* If this is a local symbol, we resolve it directly without
649 creating a procedure linkage table entry. */
650 if (h->forced_local)
651 break;
652
653 h->needs_plt = 1;
654 if (h->plt.refcount == -1)
655 h->plt.refcount = 1;
656 else
657 h->plt.refcount++;
658 break;
659
660 case R_VAX_PC8:
661 case R_VAX_PC16:
662 case R_VAX_PC32:
663 /* If we are creating a shared library and this is not a local
664 symbol, we need to copy the reloc into the shared library.
665 However when linking with -Bsymbolic and this is a global
666 symbol which is defined in an object we are including in the
667 link (i.e., DEF_REGULAR is set), then we can resolve the
668 reloc directly. At this point we have not seen all the input
669 files, so it is possible that DEF_REGULAR is not set now but
670 will be set later (it is never cleared). We account for that
671 possibility below by storing information in the
672 pcrel_relocs_copied field of the hash table entry. */
673 if (!(bfd_link_pic (info)
674 && (sec->flags & SEC_ALLOC) != 0
675 && h != NULL
676 && (!info->symbolic
677 || !h->def_regular)))
678 {
679 if (h != NULL
680 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
681 && !h->forced_local)
682 {
683 /* Make sure a plt entry is created for this symbol if
684 it turns out to be a function defined by a dynamic
685 object. */
686 if (h->plt.refcount == -1)
687 h->plt.refcount = 1;
688 else
689 h->plt.refcount++;
690 }
691 break;
692 }
693 /* If this is a local symbol, we can resolve it directly. */
694 if (h != NULL
695 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
696 || h->forced_local))
697 break;
698
699 /* Fall through. */
700 case R_VAX_8:
701 case R_VAX_16:
702 case R_VAX_32:
703 if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
704 {
705 /* Make sure a plt entry is created for this symbol if it
706 turns out to be a function defined by a dynamic object. */
707 if (h->plt.refcount == -1)
708 h->plt.refcount = 1;
709 else
710 h->plt.refcount++;
711 }
712
713 /* Non-GOT reference may need a copy reloc in executable or
714 a dynamic reloc in shared library. */
715 if (h != NULL)
716 h->non_got_ref = 1;
717
718 /* If we are creating a shared library, we need to copy the
719 reloc into the shared library. */
720 if (bfd_link_pic (info)
721 && (sec->flags & SEC_ALLOC) != 0)
722 {
723 /* When creating a shared object, we must copy these
724 reloc types into the output file. We create a reloc
725 section in dynobj and make room for this reloc. */
726 if (sreloc == NULL)
727 {
728 sreloc = _bfd_elf_make_dynamic_reloc_section
729 (sec, dynobj, 2, abfd, /*rela?*/ true);
730
731 if (sreloc == NULL)
732 return false;
733
734 if (sec->flags & SEC_READONLY)
735 info->flags |= DF_TEXTREL;
736 }
737
738 sreloc->size += sizeof (Elf32_External_Rela);
739
740 /* If we are linking with -Bsymbolic, we count the number of
741 PC relative relocations we have entered for this symbol,
742 so that we can discard them again if the symbol is later
743 defined by a regular object. Note that this function is
744 only called if we are using a vaxelf linker hash table,
745 which means that h is really a pointer to an
746 elf_vax_link_hash_entry. */
747 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8
748 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16
749 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32)
750 && info->symbolic)
751 {
752 struct elf_vax_link_hash_entry *eh;
753 struct elf_vax_pcrel_relocs_copied *p;
754
755 eh = (struct elf_vax_link_hash_entry *) h;
756
757 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
758 if (p->section == sreloc)
759 break;
760
761 if (p == NULL)
762 {
763 p = ((struct elf_vax_pcrel_relocs_copied *)
764 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
765 if (p == NULL)
766 return false;
767 p->next = eh->pcrel_relocs_copied;
768 eh->pcrel_relocs_copied = p;
769 p->section = sreloc;
770 p->count = 0;
771 }
772
773 ++p->count;
774 }
775 }
776
777 break;
778
779 /* This relocation describes the C++ object vtable hierarchy.
780 Reconstruct it for later use during GC. */
781 case R_VAX_GNU_VTINHERIT:
782 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
783 return false;
784 break;
785
786 /* This relocation describes which C++ vtable entries are actually
787 used. Record for later use during GC. */
788 case R_VAX_GNU_VTENTRY:
789 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
790 return false;
791 break;
792
793 default:
794 break;
795 }
796 }
797
798 return true;
799 }
800
801 /* Return the section that should be marked against GC for a given
802 relocation. */
803
804 static asection *
elf_vax_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)805 elf_vax_gc_mark_hook (asection *sec,
806 struct bfd_link_info *info,
807 Elf_Internal_Rela *rel,
808 struct elf_link_hash_entry *h,
809 Elf_Internal_Sym *sym)
810 {
811 if (h != NULL)
812 switch (ELF32_R_TYPE (rel->r_info))
813 {
814 case R_VAX_GNU_VTINHERIT:
815 case R_VAX_GNU_VTENTRY:
816 return NULL;
817 }
818
819 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
820 }
821
822 /* Adjust a symbol defined by a dynamic object and referenced by a
823 regular object. The current definition is in some section of the
824 dynamic object, but we're not including those sections. We have to
825 change the definition to something the rest of the link can
826 understand. */
827
828 static bool
elf_vax_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)829 elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info,
830 struct elf_link_hash_entry *h)
831 {
832 bfd *dynobj;
833 asection *s;
834
835 dynobj = elf_hash_table (info)->dynobj;
836
837 /* Make sure we know what is going on here. */
838 BFD_ASSERT (dynobj != NULL
839 && (h->needs_plt
840 || h->is_weakalias
841 || (h->def_dynamic
842 && h->ref_regular
843 && !h->def_regular)));
844
845 /* If this is a function, put it in the procedure linkage table. We
846 will fill in the contents of the procedure linkage table later,
847 when we know the address of the .got section. */
848 if (h->type == STT_FUNC
849 || h->needs_plt)
850 {
851 if (h->plt.refcount <= 0
852 || SYMBOL_CALLS_LOCAL (info, h)
853 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
854 && h->root.type == bfd_link_hash_undefweak))
855 {
856 /* This case can occur if we saw a PLTxx reloc in an input
857 file, but the symbol was never referred to by a dynamic
858 object, or if all references were garbage collected. In
859 such a case, we don't actually need to build a procedure
860 linkage table, and we can just do a PCxx reloc instead. */
861 h->plt.offset = (bfd_vma) -1;
862 h->needs_plt = 0;
863 return true;
864 }
865
866 s = elf_hash_table (info)->splt;
867 BFD_ASSERT (s != NULL);
868
869 /* If this is the first .plt entry, make room for the special
870 first entry. */
871 if (s->size == 0)
872 {
873 s->size += PLT_ENTRY_SIZE;
874 }
875
876 /* If this symbol is not defined in a regular file, and we are
877 not generating a shared library, then set the symbol to this
878 location in the .plt. This is required to make function
879 pointers compare as equal between the normal executable and
880 the shared library. */
881 if (!bfd_link_pic (info)
882 && !h->def_regular)
883 {
884 h->root.u.def.section = s;
885 h->root.u.def.value = s->size;
886 }
887
888 h->plt.offset = s->size;
889
890 /* Make room for this entry. */
891 s->size += PLT_ENTRY_SIZE;
892
893 /* We also need to make an entry in the .got.plt section, which
894 will be placed in the .got section by the linker script. */
895
896 s = elf_hash_table (info)->sgotplt;
897 BFD_ASSERT (s != NULL);
898 s->size += 4;
899
900 /* We also need to make an entry in the .rela.plt section. */
901
902 s = elf_hash_table (info)->srelplt;
903 BFD_ASSERT (s != NULL);
904 s->size += sizeof (Elf32_External_Rela);
905
906 return true;
907 }
908
909 /* Reinitialize the plt offset now that it is not used as a reference
910 count any more. */
911 h->plt.offset = (bfd_vma) -1;
912
913 /* If this is a weak symbol, and there is a real definition, the
914 processor independent code will have arranged for us to see the
915 real definition first, and we can just use the same value. */
916 if (h->is_weakalias)
917 {
918 struct elf_link_hash_entry *def = weakdef (h);
919 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
920 h->root.u.def.section = def->root.u.def.section;
921 h->root.u.def.value = def->root.u.def.value;
922 return true;
923 }
924
925 /* This is a reference to a symbol defined by a dynamic object which
926 is not a function. */
927
928 /* If we are creating a shared library, we must presume that the
929 only references to the symbol are via the global offset table.
930 For such cases we need not do anything here; the relocations will
931 be handled correctly by relocate_section. */
932 if (bfd_link_pic (info))
933 return true;
934
935 /* If there are no references to this symbol that do not use the
936 GOT relocation, we don't need to generate a copy reloc. */
937 if (!h->non_got_ref)
938 return true;
939
940 /* We must allocate the symbol in our .dynbss section, which will
941 become part of the .bss section of the executable. There will be
942 an entry for this symbol in the .dynsym section. The dynamic
943 object will contain position independent code, so all references
944 from the dynamic object to this symbol will go through the global
945 offset table. The dynamic linker will use the .dynsym entry to
946 determine the address it must put in the global offset table, so
947 both the dynamic object and the regular object will refer to the
948 same memory location for the variable. */
949
950 s = bfd_get_linker_section (dynobj, ".dynbss");
951 BFD_ASSERT (s != NULL);
952
953 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to
954 copy the initial value out of the dynamic object and into the
955 runtime process image. We need to remember the offset into the
956 .rela.bss section we are going to use. */
957 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
958 {
959 asection *srel;
960
961 srel = bfd_get_linker_section (dynobj, ".rela.bss");
962 BFD_ASSERT (srel != NULL);
963 srel->size += sizeof (Elf32_External_Rela);
964 h->needs_copy = 1;
965 }
966
967 return _bfd_elf_adjust_dynamic_copy (info, h, s);
968 }
969
970 /* This function is called via elf_link_hash_traverse. It resets GOT
971 and PLT (.GOT) reference counts back to -1 so normal PC32 relocation
972 will be done. */
973
974 static bool
elf_vax_discard_got_entries(struct elf_link_hash_entry * h,void * infoptr ATTRIBUTE_UNUSED)975 elf_vax_discard_got_entries (struct elf_link_hash_entry *h,
976 void *infoptr ATTRIBUTE_UNUSED)
977 {
978 h->got.refcount = -1;
979 h->plt.refcount = -1;
980
981 return true;
982 }
983
984 /* Discard unused dynamic data if this is a static link. */
985
986 static bool
elf_vax_early_size_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)987 elf_vax_early_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
988 struct bfd_link_info *info)
989 {
990 bfd *dynobj;
991 asection *s;
992
993 dynobj = elf_hash_table (info)->dynobj;
994
995 if (dynobj && !elf_hash_table (info)->dynamic_sections_created)
996 {
997 /* We may have created entries in the .rela.got and .got sections.
998 However, if we are not creating the dynamic sections, we will
999 not actually use these entries. Reset the size of .rela.got
1000 and .got, which will cause them to get stripped from the output
1001 file below. */
1002 s = elf_hash_table (info)->srelgot;
1003 if (s != NULL)
1004 s->size = 0;
1005 s = elf_hash_table (info)->sgotplt;
1006 if (s != NULL)
1007 s->size = 0;
1008 s = elf_hash_table (info)->sgot;
1009 if (s != NULL)
1010 s->size = 0;
1011 }
1012
1013 /* If this is a static link, we need to discard all the got entries we've
1014 recorded. */
1015 if (!dynobj || !elf_hash_table (info)->dynamic_sections_created)
1016 elf_link_hash_traverse (elf_hash_table (info),
1017 elf_vax_discard_got_entries,
1018 info);
1019
1020 return true;
1021 }
1022
1023 /* Set the sizes of the dynamic sections. */
1024
1025 static bool
elf_vax_late_size_sections(bfd * output_bfd,struct bfd_link_info * info)1026 elf_vax_late_size_sections (bfd *output_bfd, struct bfd_link_info *info)
1027 {
1028 bfd *dynobj;
1029 asection *s;
1030 bool relocs;
1031
1032 dynobj = elf_hash_table (info)->dynobj;
1033 if (dynobj == NULL)
1034 return true;
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
elf_vax_discard_copies(struct elf_vax_link_hash_entry * h,void * ignore ATTRIBUTE_UNUSED)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
elf_vax_instantiate_got_entries(struct elf_link_hash_entry * h,void * infoptr)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
elf_vax_relocate_section(bfd * output_bfd,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)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
elf_vax_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)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
elf_vax_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)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
elf_vax_reloc_type_class(const struct bfd_link_info * info ATTRIBUTE_UNUSED,const asection * rel_sec ATTRIBUTE_UNUSED,const Elf_Internal_Rela * rela)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
elf_vax_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)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_early_size_sections elf_vax_early_size_sections
1865 #define elf_backend_late_size_sections elf_vax_late_size_sections
1866 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
1867 #define elf_backend_relocate_section elf_vax_relocate_section
1868 #define elf_backend_finish_dynamic_symbol \
1869 elf_vax_finish_dynamic_symbol
1870 #define elf_backend_finish_dynamic_sections \
1871 elf_vax_finish_dynamic_sections
1872 #define elf_backend_reloc_type_class elf_vax_reloc_type_class
1873 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook
1874 #define elf_backend_plt_sym_val elf_vax_plt_sym_val
1875 #define bfd_elf32_bfd_merge_private_bfd_data \
1876 elf32_vax_merge_private_bfd_data
1877 #define bfd_elf32_bfd_set_private_flags \
1878 elf32_vax_set_private_flags
1879 #define bfd_elf32_bfd_print_private_bfd_data \
1880 elf32_vax_print_private_bfd_data
1881
1882 #define elf_backend_can_gc_sections 1
1883 #define elf_backend_want_got_plt 1
1884 #define elf_backend_plt_readonly 1
1885 #define elf_backend_want_plt_sym 0
1886 #define elf_backend_got_header_size 16
1887 #define elf_backend_rela_normal 1
1888 #define elf_backend_dtrel_excludes_plt 1
1889
1890 #include "elf32-target.h"
1891