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2007-04-03 Matt Thomas <matt@netbsd.org>
[binutils-gdb.git] / bfd / elf32-vax.c
1 /* VAX series support for 32-bit ELF
2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 Contributed by Matt Thomas <matt@3am-software.com>.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
21
22 #include "bfd.h"
23 #include "sysdep.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/vax.h"
28
29 static reloc_howto_type *reloc_type_lookup (bfd *, bfd_reloc_code_real_type);
30 static void rtype_to_howto (bfd *, arelent *, Elf_Internal_Rela *);
31 static struct bfd_hash_entry *elf_vax_link_hash_newfunc (struct bfd_hash_entry *,
32 struct bfd_hash_table *,
33 const char *);
34 static struct bfd_link_hash_table *elf_vax_link_hash_table_create (bfd *);
35 static bfd_boolean elf_vax_check_relocs (bfd *, struct bfd_link_info *,
36 asection *, const Elf_Internal_Rela *);
37 static bfd_boolean elf_vax_adjust_dynamic_symbol (struct bfd_link_info *,
38 struct elf_link_hash_entry *);
39 static bfd_boolean elf_vax_size_dynamic_sections (bfd *, struct bfd_link_info *);
40 static bfd_boolean elf_vax_relocate_section (bfd *, struct bfd_link_info *,
41 bfd *, asection *, bfd_byte *,
42 Elf_Internal_Rela *,
43 Elf_Internal_Sym *, asection **);
44 static bfd_boolean elf_vax_finish_dynamic_symbol (bfd *, struct bfd_link_info *,
45 struct elf_link_hash_entry *,
46 Elf_Internal_Sym *);
47 static bfd_boolean elf_vax_finish_dynamic_sections (bfd *,
48 struct bfd_link_info *);
49
50 static bfd_boolean elf32_vax_set_private_flags (bfd *, flagword);
51 static bfd_boolean elf32_vax_merge_private_bfd_data (bfd *, bfd *);
52 static bfd_boolean elf32_vax_print_private_bfd_data (bfd *, PTR);
53
54 static reloc_howto_type howto_table[] = {
55 HOWTO (R_VAX_NONE, /* type */
56 0, /* rightshift */
57 0, /* 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 void
281 rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
282 Elf_Internal_Rela *dst)
283 {
284 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_VAX_max);
285 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
286 }
287
288 #define elf_info_to_howto rtype_to_howto
289
290 static const struct
291 {
292 bfd_reloc_code_real_type bfd_val;
293 int elf_val;
294 } reloc_map[] = {
295 { BFD_RELOC_NONE, R_VAX_NONE },
296 { BFD_RELOC_32, R_VAX_32 },
297 { BFD_RELOC_16, R_VAX_16 },
298 { BFD_RELOC_8, R_VAX_8 },
299 { BFD_RELOC_32_PCREL, R_VAX_PC32 },
300 { BFD_RELOC_16_PCREL, R_VAX_PC16 },
301 { BFD_RELOC_8_PCREL, R_VAX_PC8 },
302 { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 },
303 { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 },
304 { BFD_RELOC_NONE, R_VAX_COPY },
305 { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT },
306 { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT },
307 { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE },
308 { BFD_RELOC_CTOR, R_VAX_32 },
309 { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT },
310 { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY },
311 };
312
313 static reloc_howto_type *
314 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code)
315 {
316 unsigned int i;
317 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
318 {
319 if (reloc_map[i].bfd_val == code)
320 return &howto_table[reloc_map[i].elf_val];
321 }
322 return 0;
323 }
324
325 static reloc_howto_type *
326 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
327 const char *r_name)
328 {
329 unsigned int i;
330
331 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++)
332 if (howto_table[i].name != NULL
333 && strcasecmp (howto_table[i].name, r_name) == 0)
334 return &howto_table[i];
335
336 return NULL;
337 }
338
339 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
340 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup
341 #define ELF_ARCH bfd_arch_vax
342 /* end code generated by elf.el */
343 \f
344 /* Functions for the VAX ELF linker. */
345
346 /* The name of the dynamic interpreter. This is put in the .interp
347 section. */
348
349 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so"
350
351 /* The size in bytes of an entry in the procedure linkage table. */
352
353 #define PLT_ENTRY_SIZE 12
354
355 /* The first entry in a procedure linkage table looks like this. See
356 the SVR4 ABI VAX supplement to see how this works. */
357
358 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] =
359 {
360 0xdd, 0xef, /* pushl l^ */
361 0, 0, 0, 0, /* offset to .plt.got + 4 */
362 0x17, 0xff, /* jmp @L^(pc) */
363 0, 0, 0, 0, /* offset to .plt.got + 8 */
364 };
365
366 /* Subsequent entries in a procedure linkage table look like this. */
367
368 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] =
369 {
370 0x40, 0x00, /* .word ^M<r6> */
371 0x16, 0xef, /* jsb L^(pc) */
372 0, 0, 0, 0, /* replaced with offset to start of .plt */
373 0, 0, 0, 0, /* index into .rela.plt */
374 };
375
376 /* The VAX linker needs to keep track of the number of relocs that it
377 decides to copy in check_relocs for each symbol. This is so that it
378 can discard PC relative relocs if it doesn't need them when linking
379 with -Bsymbolic. We store the information in a field extending the
380 regular ELF linker hash table. */
381
382 /* This structure keeps track of the number of PC relative relocs we have
383 copied for a given symbol. */
384
385 struct elf_vax_pcrel_relocs_copied
386 {
387 /* Next section. */
388 struct elf_vax_pcrel_relocs_copied *next;
389 /* A section in dynobj. */
390 asection *section;
391 /* Number of relocs copied in this section. */
392 bfd_size_type count;
393 };
394
395 /* VAX ELF linker hash entry. */
396
397 struct elf_vax_link_hash_entry
398 {
399 struct elf_link_hash_entry root;
400
401 /* Number of PC relative relocs copied for this symbol. */
402 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied;
403
404 bfd_vma got_addend;
405 };
406
407 /* VAX ELF linker hash table. */
408
409 struct elf_vax_link_hash_table
410 {
411 struct elf_link_hash_table root;
412 };
413
414 /* Declare this now that the above structures are defined. */
415
416 static bfd_boolean elf_vax_discard_copies (struct elf_vax_link_hash_entry *,
417 PTR);
418
419 /* Declare this now that the above structures are defined. */
420
421 static bfd_boolean elf_vax_instantiate_got_entries (struct elf_link_hash_entry *,
422 PTR);
423
424 /* Traverse an VAX ELF linker hash table. */
425
426 #define elf_vax_link_hash_traverse(table, func, info) \
427 (elf_link_hash_traverse \
428 (&(table)->root, \
429 (bfd_boolean (*) (struct elf_link_hash_entry *, PTR)) (func), \
430 (info)))
431
432 /* Get the VAX ELF linker hash table from a link_info structure. */
433
434 #define elf_vax_hash_table(p) ((struct elf_vax_link_hash_table *) (p)->hash)
435
436 /* Create an entry in an VAX ELF linker hash table. */
437
438 static struct bfd_hash_entry *
439 elf_vax_link_hash_newfunc (struct bfd_hash_entry *entry,
440 struct bfd_hash_table *table,
441 const char *string)
442 {
443 struct elf_vax_link_hash_entry *ret =
444 (struct elf_vax_link_hash_entry *) entry;
445
446 /* Allocate the structure if it has not already been allocated by a
447 subclass. */
448 if (ret == NULL)
449 ret = ((struct elf_vax_link_hash_entry *)
450 bfd_hash_allocate (table,
451 sizeof (struct elf_vax_link_hash_entry)));
452 if (ret == NULL)
453 return (struct bfd_hash_entry *) ret;
454
455 /* Call the allocation method of the superclass. */
456 ret = ((struct elf_vax_link_hash_entry *)
457 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
458 table, string));
459 if (ret != NULL)
460 {
461 ret->pcrel_relocs_copied = NULL;
462 }
463
464 return (struct bfd_hash_entry *) ret;
465 }
466
467 /* Create an VAX ELF linker hash table. */
468
469 static struct bfd_link_hash_table *
470 elf_vax_link_hash_table_create (bfd *abfd)
471 {
472 struct elf_vax_link_hash_table *ret;
473 bfd_size_type amt = sizeof (struct elf_vax_link_hash_table);
474
475 ret = bfd_malloc (amt);
476 if (ret == NULL)
477 return NULL;
478
479 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
480 elf_vax_link_hash_newfunc,
481 sizeof (struct elf_vax_link_hash_entry)))
482 {
483 free (ret);
484 return NULL;
485 }
486
487 return &ret->root.root;
488 }
489
490 /* Keep vax-specific flags in the ELF header */
491 static bfd_boolean
492 elf32_vax_set_private_flags (bfd *abfd, flagword flags)
493 {
494 elf_elfheader (abfd)->e_flags = flags;
495 elf_flags_init (abfd) = TRUE;
496 return TRUE;
497 }
498
499 /* Merge backend specific data from an object file to the output
500 object file when linking. */
501 static bfd_boolean
502 elf32_vax_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
503 {
504 flagword out_flags;
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 out_flags = elf_elfheader (obfd)->e_flags;
513
514 if (!elf_flags_init (obfd))
515 {
516 elf_flags_init (obfd) = TRUE;
517 elf_elfheader (obfd)->e_flags = in_flags;
518 }
519
520 return TRUE;
521 }
522
523 /* Display the flags field */
524 static bfd_boolean
525 elf32_vax_print_private_bfd_data (bfd *abfd, PTR ptr)
526 {
527 FILE *file = (FILE *) ptr;
528
529 BFD_ASSERT (abfd != NULL && ptr != NULL);
530
531 /* Print normal ELF private data. */
532 _bfd_elf_print_private_bfd_data (abfd, ptr);
533
534 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
535
536 /* xgettext:c-format */
537 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
538
539 if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC)
540 fprintf (file, _(" [nonpic]"));
541
542 if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT)
543 fprintf (file, _(" [d-float]"));
544
545 if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT)
546 fprintf (file, _(" [g-float]"));
547
548 fputc ('\n', file);
549
550 return TRUE;
551 }
552 /* Look through the relocs for a section during the first phase, and
553 allocate space in the global offset table or procedure linkage
554 table. */
555
556 static bfd_boolean
557 elf_vax_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec,
558 const Elf_Internal_Rela *relocs)
559 {
560 bfd *dynobj;
561 Elf_Internal_Shdr *symtab_hdr;
562 struct elf_link_hash_entry **sym_hashes;
563 const Elf_Internal_Rela *rel;
564 const Elf_Internal_Rela *rel_end;
565 asection *sgot;
566 asection *srelgot;
567 asection *sreloc;
568
569 if (info->relocatable)
570 return TRUE;
571
572 dynobj = elf_hash_table (info)->dynobj;
573 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
574 sym_hashes = elf_sym_hashes (abfd);
575
576 sgot = NULL;
577 srelgot = NULL;
578 sreloc = NULL;
579
580 rel_end = relocs + sec->reloc_count;
581 for (rel = relocs; rel < rel_end; rel++)
582 {
583 unsigned long r_symndx;
584 struct elf_link_hash_entry *h;
585
586 r_symndx = ELF32_R_SYM (rel->r_info);
587
588 if (r_symndx < symtab_hdr->sh_info)
589 h = NULL;
590 else
591 {
592 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
593 while (h->root.type == bfd_link_hash_indirect
594 || h->root.type == bfd_link_hash_warning)
595 h = (struct elf_link_hash_entry *) h->root.u.i.link;
596 }
597
598 switch (ELF32_R_TYPE (rel->r_info))
599 {
600 case R_VAX_GOT32:
601 if (h != NULL
602 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
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 (sgot == NULL)
616 {
617 sgot = bfd_get_section_by_name (dynobj, ".got");
618 BFD_ASSERT (sgot != NULL);
619 }
620
621 if (srelgot == NULL
622 && (h != NULL || info->shared))
623 {
624 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
625 if (srelgot == NULL)
626 {
627 srelgot = bfd_make_section_with_flags (dynobj,
628 ".rela.got",
629 (SEC_ALLOC
630 | SEC_LOAD
631 | SEC_HAS_CONTENTS
632 | SEC_IN_MEMORY
633 | SEC_LINKER_CREATED
634 | SEC_READONLY));
635 if (srelgot == NULL
636 || !bfd_set_section_alignment (dynobj, srelgot, 2))
637 return FALSE;
638 }
639 }
640
641 if (h != NULL)
642 {
643 struct elf_vax_link_hash_entry *eh;
644
645 eh = (struct elf_vax_link_hash_entry *) h;
646 if (h->got.refcount == -1)
647 {
648 h->got.refcount = 1;
649 eh->got_addend = rel->r_addend;
650 }
651 else
652 {
653 h->got.refcount++;
654 if (eh->got_addend != (bfd_vma) rel->r_addend)
655 (*_bfd_error_handler)
656 (_("%s: warning: GOT addend of %ld to `%s' does not match previous GOT addend of %ld"),
657 bfd_get_filename (abfd), rel->r_addend,
658 h->root.root.string,
659 eh->got_addend);
660
661 }
662 }
663 break;
664
665 case R_VAX_PLT32:
666 /* This symbol requires a procedure linkage table entry. We
667 actually build the entry in adjust_dynamic_symbol,
668 because this might be a case of linking PIC code which is
669 never referenced by a dynamic object, in which case we
670 don't need to generate a procedure linkage table entry
671 after all. */
672
673 /* If this is a local symbol, we resolve it directly without
674 creating a procedure linkage table entry. */
675 if (h == NULL)
676 continue;
677
678 h->needs_plt = 1;
679 if (h->plt.refcount == -1)
680 h->plt.refcount = 1;
681 else
682 h->plt.refcount++;
683 break;
684
685 case R_VAX_PC8:
686 case R_VAX_PC16:
687 case R_VAX_PC32:
688 /* If we are creating a shared library and this is not a local
689 symbol, we need to copy the reloc into the shared library.
690 However when linking with -Bsymbolic and this is a global
691 symbol which is defined in an object we are including in the
692 link (i.e., DEF_REGULAR is set), then we can resolve the
693 reloc directly. At this point we have not seen all the input
694 files, so it is possible that DEF_REGULAR is not set now but
695 will be set later (it is never cleared). We account for that
696 possibility below by storing information in the
697 pcrel_relocs_copied field of the hash table entry. */
698 if (!(info->shared
699 && (sec->flags & SEC_ALLOC) != 0
700 && h != NULL
701 && (!info->symbolic
702 || !h->def_regular)))
703 {
704 if (h != NULL)
705 {
706 /* Make sure a plt entry is created for this symbol if
707 it turns out to be a function defined by a dynamic
708 object. */
709 if (h->plt.refcount == -1)
710 h->plt.refcount = 1;
711 else
712 h->plt.refcount++;
713 }
714 break;
715 }
716 /* Fall through. */
717 case R_VAX_8:
718 case R_VAX_16:
719 case R_VAX_32:
720 if (h != NULL)
721 {
722 /* Make sure a plt entry is created for this symbol if it
723 turns out to be a function defined by a dynamic object. */
724 if (h->plt.refcount == -1)
725 h->plt.refcount = 1;
726 else
727 h->plt.refcount++;
728 }
729
730 /* If we are creating a shared library, we need to copy the
731 reloc into the shared library. */
732 if (info->shared
733 && (sec->flags & SEC_ALLOC) != 0)
734 {
735 /* When creating a shared object, we must copy these
736 reloc types into the output file. We create a reloc
737 section in dynobj and make room for this reloc. */
738 if (sreloc == NULL)
739 {
740 const char *name;
741
742 name = (bfd_elf_string_from_elf_section
743 (abfd,
744 elf_elfheader (abfd)->e_shstrndx,
745 elf_section_data (sec)->rel_hdr.sh_name));
746 if (name == NULL)
747 return FALSE;
748
749 BFD_ASSERT (CONST_STRNEQ (name, ".rela")
750 && strcmp (bfd_get_section_name (abfd, sec),
751 name + 5) == 0);
752
753 sreloc = bfd_get_section_by_name (dynobj, name);
754 if (sreloc == NULL)
755 {
756 sreloc = bfd_make_section_with_flags (dynobj,
757 name,
758 (SEC_ALLOC
759 | SEC_LOAD
760 | SEC_HAS_CONTENTS
761 | SEC_IN_MEMORY
762 | SEC_LINKER_CREATED
763 | SEC_READONLY));
764 if (sreloc == NULL
765 || !bfd_set_section_alignment (dynobj, sreloc, 2))
766 return FALSE;
767 }
768 if (sec->flags & SEC_READONLY)
769 info->flags |= DF_TEXTREL;
770 }
771
772 sreloc->size += sizeof (Elf32_External_Rela);
773
774 /* If we are linking with -Bsymbolic, we count the number of
775 PC relative relocations we have entered for this symbol,
776 so that we can discard them again if the symbol is later
777 defined by a regular object. Note that this function is
778 only called if we are using a vaxelf linker hash table,
779 which means that h is really a pointer to an
780 elf_vax_link_hash_entry. */
781 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8
782 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16
783 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32)
784 && info->symbolic)
785 {
786 struct elf_vax_link_hash_entry *eh;
787 struct elf_vax_pcrel_relocs_copied *p;
788
789 eh = (struct elf_vax_link_hash_entry *) h;
790
791 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
792 if (p->section == sreloc)
793 break;
794
795 if (p == NULL)
796 {
797 p = ((struct elf_vax_pcrel_relocs_copied *)
798 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
799 if (p == NULL)
800 return FALSE;
801 p->next = eh->pcrel_relocs_copied;
802 eh->pcrel_relocs_copied = p;
803 p->section = sreloc;
804 p->count = 0;
805 }
806
807 ++p->count;
808 }
809 }
810
811 break;
812
813 /* This relocation describes the C++ object vtable hierarchy.
814 Reconstruct it for later use during GC. */
815 case R_VAX_GNU_VTINHERIT:
816 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
817 return FALSE;
818 break;
819
820 /* This relocation describes which C++ vtable entries are actually
821 used. Record for later use during GC. */
822 case R_VAX_GNU_VTENTRY:
823 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
824 return FALSE;
825 break;
826
827 default:
828 break;
829 }
830 }
831
832 return TRUE;
833 }
834
835 /* Return the section that should be marked against GC for a given
836 relocation. */
837
838 static asection *
839 elf_vax_gc_mark_hook (asection *sec,
840 struct bfd_link_info *info,
841 Elf_Internal_Rela *rel,
842 struct elf_link_hash_entry *h,
843 Elf_Internal_Sym *sym)
844 {
845 if (h != NULL)
846 switch (ELF32_R_TYPE (rel->r_info))
847 {
848 case R_VAX_GNU_VTINHERIT:
849 case R_VAX_GNU_VTENTRY:
850 return NULL;
851 }
852
853 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
854 }
855
856 /* Update the got entry reference counts for the section being removed. */
857
858 static bfd_boolean
859 elf_vax_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, asection *sec,
860 const Elf_Internal_Rela *relocs)
861 {
862 Elf_Internal_Shdr *symtab_hdr;
863 struct elf_link_hash_entry **sym_hashes;
864 const Elf_Internal_Rela *rel, *relend;
865 bfd *dynobj;
866
867 dynobj = elf_hash_table (info)->dynobj;
868 if (dynobj == NULL)
869 return TRUE;
870
871 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
872 sym_hashes = elf_sym_hashes (abfd);
873
874 relend = relocs + sec->reloc_count;
875 for (rel = relocs; rel < relend; rel++)
876 {
877 unsigned long r_symndx;
878 struct elf_link_hash_entry *h = NULL;
879
880 r_symndx = ELF32_R_SYM (rel->r_info);
881 if (r_symndx >= symtab_hdr->sh_info)
882 {
883 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
884 while (h->root.type == bfd_link_hash_indirect
885 || h->root.type == bfd_link_hash_warning)
886 h = (struct elf_link_hash_entry *) h->root.u.i.link;
887 }
888
889 switch (ELF32_R_TYPE (rel->r_info))
890 {
891 case R_VAX_GOT32:
892 if (h != NULL && h->got.refcount > 0)
893 --h->got.refcount;
894 break;
895
896 case R_VAX_PLT32:
897 case R_VAX_PC8:
898 case R_VAX_PC16:
899 case R_VAX_PC32:
900 case R_VAX_8:
901 case R_VAX_16:
902 case R_VAX_32:
903 if (h != NULL && h->plt.refcount > 0)
904 --h->plt.refcount;
905 break;
906
907 default:
908 break;
909 }
910 }
911
912 return TRUE;
913 }
914
915 /* Adjust a symbol defined by a dynamic object and referenced by a
916 regular object. The current definition is in some section of the
917 dynamic object, but we're not including those sections. We have to
918 change the definition to something the rest of the link can
919 understand. */
920
921 static bfd_boolean
922 elf_vax_adjust_dynamic_symbol (info, h)
923 struct bfd_link_info *info;
924 struct elf_link_hash_entry *h;
925 {
926 bfd *dynobj;
927 asection *s;
928 unsigned int power_of_two;
929
930 dynobj = elf_hash_table (info)->dynobj;
931
932 /* Make sure we know what is going on here. */
933 BFD_ASSERT (dynobj != NULL
934 && (h->needs_plt
935 || h->u.weakdef != NULL
936 || (h->def_dynamic
937 && h->ref_regular
938 && !h->def_regular)));
939
940 /* If this is a function, put it in the procedure linkage table. We
941 will fill in the contents of the procedure linkage table later,
942 when we know the address of the .got section. */
943 if (h->type == STT_FUNC
944 || h->needs_plt)
945 {
946 if (! info->shared
947 && !h->def_dynamic
948 && !h->ref_dynamic
949 /* We must always create the plt entry if it was referenced
950 by a PLTxxO relocation. In this case we already recorded
951 it as a dynamic symbol. */
952 && h->dynindx == -1)
953 {
954 /* This case can occur if we saw a PLTxx reloc in an input
955 file, but the symbol was never referred to by a dynamic
956 object. In such a case, we don't actually need to build
957 a procedure linkage table, and we can just do a PCxx
958 reloc instead. */
959 BFD_ASSERT (h->needs_plt);
960 h->plt.offset = (bfd_vma) -1;
961 return TRUE;
962 }
963
964 /* GC may have rendered this entry unused. */
965 if (h->plt.refcount <= 0)
966 {
967 h->needs_plt = 0;
968 h->plt.offset = (bfd_vma) -1;
969 return TRUE;
970 }
971
972 /* Make sure this symbol is output as a dynamic symbol. */
973 if (h->dynindx == -1)
974 {
975 if (! bfd_elf_link_record_dynamic_symbol (info, h))
976 return FALSE;
977 }
978
979 s = bfd_get_section_by_name (dynobj, ".plt");
980 BFD_ASSERT (s != NULL);
981
982 /* If this is the first .plt entry, make room for the special
983 first entry. */
984 if (s->size == 0)
985 {
986 s->size += PLT_ENTRY_SIZE;
987 }
988
989 /* If this symbol is not defined in a regular file, and we are
990 not generating a shared library, then set the symbol to this
991 location in the .plt. This is required to make function
992 pointers compare as equal between the normal executable and
993 the shared library. */
994 if (!info->shared
995 && !h->def_regular)
996 {
997 h->root.u.def.section = s;
998 h->root.u.def.value = s->size;
999 }
1000
1001 h->plt.offset = s->size;
1002
1003 /* Make room for this entry. */
1004 s->size += PLT_ENTRY_SIZE;
1005
1006 /* We also need to make an entry in the .got.plt section, which
1007 will be placed in the .got section by the linker script. */
1008
1009 s = bfd_get_section_by_name (dynobj, ".got.plt");
1010 BFD_ASSERT (s != NULL);
1011 s->size += 4;
1012
1013 /* We also need to make an entry in the .rela.plt section. */
1014
1015 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1016 BFD_ASSERT (s != NULL);
1017 s->size += sizeof (Elf32_External_Rela);
1018
1019 return TRUE;
1020 }
1021
1022 /* Reinitialize the plt offset now that it is not used as a reference
1023 count any more. */
1024 h->plt.offset = (bfd_vma) -1;
1025
1026 /* If this is a weak symbol, and there is a real definition, the
1027 processor independent code will have arranged for us to see the
1028 real definition first, and we can just use the same value. */
1029 if (h->u.weakdef != NULL)
1030 {
1031 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1032 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1033 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1034 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1035 return TRUE;
1036 }
1037
1038 /* This is a reference to a symbol defined by a dynamic object which
1039 is not a function. */
1040
1041 /* If we are creating a shared library, we must presume that the
1042 only references to the symbol are via the global offset table.
1043 For such cases we need not do anything here; the relocations will
1044 be handled correctly by relocate_section. */
1045 if (info->shared)
1046 return TRUE;
1047
1048 if (h->size == 0)
1049 {
1050 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1051 h->root.root.string);
1052 return TRUE;
1053 }
1054
1055 /* We must allocate the symbol in our .dynbss section, which will
1056 become part of the .bss section of the executable. There will be
1057 an entry for this symbol in the .dynsym section. The dynamic
1058 object will contain position independent code, so all references
1059 from the dynamic object to this symbol will go through the global
1060 offset table. The dynamic linker will use the .dynsym entry to
1061 determine the address it must put in the global offset table, so
1062 both the dynamic object and the regular object will refer to the
1063 same memory location for the variable. */
1064
1065 s = bfd_get_section_by_name (dynobj, ".dynbss");
1066 BFD_ASSERT (s != NULL);
1067
1068 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to
1069 copy the initial value out of the dynamic object and into the
1070 runtime process image. We need to remember the offset into the
1071 .rela.bss section we are going to use. */
1072 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1073 {
1074 asection *srel;
1075
1076 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1077 BFD_ASSERT (srel != NULL);
1078 srel->size += sizeof (Elf32_External_Rela);
1079 h->needs_copy = 1;
1080 }
1081
1082 /* We need to figure out the alignment required for this symbol. I
1083 have no idea how ELF linkers handle this. */
1084 power_of_two = bfd_log2 (h->size);
1085 if (power_of_two > 3)
1086 power_of_two = 3;
1087
1088 /* Apply the required alignment. */
1089 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1090 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1091 {
1092 if (!bfd_set_section_alignment (dynobj, s, power_of_two))
1093 return FALSE;
1094 }
1095
1096 /* Define the symbol as being at this point in the section. */
1097 h->root.u.def.section = s;
1098 h->root.u.def.value = s->size;
1099
1100 /* Increment the section size to make room for the symbol. */
1101 s->size += h->size;
1102
1103 return TRUE;
1104 }
1105
1106 /* Set the sizes of the dynamic sections. */
1107
1108 static bfd_boolean
1109 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1110 {
1111 bfd *dynobj;
1112 asection *s;
1113 bfd_boolean plt;
1114 bfd_boolean relocs;
1115 bfd_boolean reltext;
1116
1117 dynobj = elf_hash_table (info)->dynobj;
1118 BFD_ASSERT (dynobj != NULL);
1119
1120 if (elf_hash_table (info)->dynamic_sections_created)
1121 {
1122 /* Set the contents of the .interp section to the interpreter. */
1123 if (info->executable)
1124 {
1125 s = bfd_get_section_by_name (dynobj, ".interp");
1126 BFD_ASSERT (s != NULL);
1127 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1128 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1129 }
1130 }
1131 else
1132 {
1133 /* We may have created entries in the .rela.got and .got sections.
1134 However, if we are not creating the dynamic sections, we will
1135 not actually use these entries. Reset the size of .rela.got
1136 and .got, which will cause it to get stripped from the output
1137 file below. */
1138 s = bfd_get_section_by_name (dynobj, ".rela.got");
1139 if (s != NULL)
1140 s->size = 0;
1141 s = bfd_get_section_by_name (dynobj, ".got.plt");
1142 if (s != NULL)
1143 s->size = 0;
1144 s = bfd_get_section_by_name (dynobj, ".got");
1145 if (s != NULL)
1146 s->size = 0;
1147 }
1148
1149 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1150 relative relocs against symbols defined in a regular object. We
1151 allocated space for them in the check_relocs routine, but we will not
1152 fill them in in the relocate_section routine. */
1153 if (info->shared && info->symbolic)
1154 elf_vax_link_hash_traverse (elf_vax_hash_table (info),
1155 elf_vax_discard_copies,
1156 NULL);
1157
1158 /* If this is a -Bsymbolic shared link or a static link, we need to
1159 discard all the got entries we've recorded. Otherwise, we need to
1160 instantiate (allocate space for them). */
1161 elf_link_hash_traverse (elf_hash_table (info),
1162 elf_vax_instantiate_got_entries,
1163 (PTR) info);
1164
1165 /* The check_relocs and adjust_dynamic_symbol entry points have
1166 determined the sizes of the various dynamic sections. Allocate
1167 memory for them. */
1168 plt = FALSE;
1169 relocs = FALSE;
1170 reltext = FALSE;
1171 for (s = dynobj->sections; s != NULL; s = s->next)
1172 {
1173 const char *name;
1174
1175 if ((s->flags & SEC_LINKER_CREATED) == 0)
1176 continue;
1177
1178 /* It's OK to base decisions on the section name, because none
1179 of the dynobj section names depend upon the input files. */
1180 name = bfd_get_section_name (dynobj, s);
1181
1182 if (strcmp (name, ".plt") == 0)
1183 {
1184 /* Remember whether there is a PLT. */
1185 plt = s->size != 0;
1186 }
1187 else if (CONST_STRNEQ (name, ".rela"))
1188 {
1189 if (s->size != 0)
1190 {
1191 asection *target;
1192
1193 /* Remember whether there are any reloc sections other
1194 than .rela.plt. */
1195 if (strcmp (name, ".rela.plt") != 0)
1196 {
1197 const char *outname;
1198
1199 relocs = TRUE;
1200
1201 /* If this relocation section applies to a read only
1202 section, then we probably need a DT_TEXTREL
1203 entry. .rela.plt is actually associated with
1204 .got.plt, which is never readonly. */
1205 outname = bfd_get_section_name (output_bfd,
1206 s->output_section);
1207 target = bfd_get_section_by_name (output_bfd, outname + 5);
1208 if (target != NULL
1209 && (target->flags & SEC_READONLY) != 0
1210 && (target->flags & SEC_ALLOC) != 0)
1211 reltext = TRUE;
1212 }
1213
1214 /* We use the reloc_count field as a counter if we need
1215 to copy relocs into the output file. */
1216 s->reloc_count = 0;
1217 }
1218 }
1219 else if (! CONST_STRNEQ (name, ".got")
1220 && strcmp (name, ".dynbss") != 0)
1221 {
1222 /* It's not one of our sections, so don't allocate space. */
1223 continue;
1224 }
1225
1226 if (s->size == 0)
1227 {
1228 /* If we don't need this section, strip it from the
1229 output file. This is mostly to handle .rela.bss and
1230 .rela.plt. We must create both sections in
1231 create_dynamic_sections, because they must be created
1232 before the linker maps input sections to output
1233 sections. The linker does that before
1234 adjust_dynamic_symbol is called, and it is that
1235 function which decides whether anything needs to go
1236 into these sections. */
1237 s->flags |= SEC_EXCLUDE;
1238 continue;
1239 }
1240
1241 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1242 continue;
1243
1244 /* Allocate memory for the section contents. */
1245 s->contents = (bfd_byte *) bfd_alloc (dynobj, s->size);
1246 if (s->contents == NULL)
1247 return FALSE;
1248 }
1249
1250 if (elf_hash_table (info)->dynamic_sections_created)
1251 {
1252 /* Add some entries to the .dynamic section. We fill in the
1253 values later, in elf_vax_finish_dynamic_sections, but we
1254 must add the entries now so that we get the correct size for
1255 the .dynamic section. The DT_DEBUG entry is filled in by the
1256 dynamic linker and used by the debugger. */
1257 #define add_dynamic_entry(TAG, VAL) \
1258 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1259
1260 if (!info->shared)
1261 {
1262 if (!add_dynamic_entry (DT_DEBUG, 0))
1263 return FALSE;
1264 }
1265
1266 if (plt)
1267 {
1268 if (!add_dynamic_entry (DT_PLTGOT, 0)
1269 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1270 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1271 || !add_dynamic_entry (DT_JMPREL, 0))
1272 return FALSE;
1273 }
1274
1275 if (relocs)
1276 {
1277 if (!add_dynamic_entry (DT_RELA, 0)
1278 || !add_dynamic_entry (DT_RELASZ, 0)
1279 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1280 return FALSE;
1281 }
1282
1283 if (reltext || (info->flags & DF_TEXTREL) != 0)
1284 {
1285 if (!add_dynamic_entry (DT_TEXTREL, 0))
1286 return FALSE;
1287 }
1288 }
1289 #undef add_dynamic_entry
1290
1291 return TRUE;
1292 }
1293
1294 /* This function is called via elf_vax_link_hash_traverse if we are
1295 creating a shared object with -Bsymbolic. It discards the space
1296 allocated to copy PC relative relocs against symbols which are defined
1297 in regular objects. We allocated space for them in the check_relocs
1298 routine, but we won't fill them in in the relocate_section routine. */
1299
1300 static bfd_boolean
1301 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h,
1302 PTR ignore ATTRIBUTE_UNUSED)
1303 {
1304 struct elf_vax_pcrel_relocs_copied *s;
1305
1306 if (h->root.root.type == bfd_link_hash_warning)
1307 h = (struct elf_vax_link_hash_entry *) h->root.root.u.i.link;
1308
1309 /* We only discard relocs for symbols defined in a regular object. */
1310 if (!h->root.def_regular)
1311 return TRUE;
1312
1313 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1314 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1315
1316 return TRUE;
1317 }
1318
1319 /* This function is called via elf_link_hash_traverse. It looks for entries
1320 that have GOT or PLT (.GOT) references. If creating a static object or a
1321 shared object with -Bsymbolic, it resets the reference count back to 0
1322 and sets the offset to -1 so normal PC32 relocation will be done. If
1323 creating a shared object or executable, space in the .got and .rela.got
1324 will be reserved for the symbol. */
1325
1326 static bfd_boolean
1327 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, PTR infoptr)
1328 {
1329 struct bfd_link_info *info = (struct bfd_link_info *) infoptr;
1330 bfd *dynobj;
1331 asection *sgot;
1332 asection *srelgot;
1333
1334 /* We don't care about non-GOT (and non-PLT) entries. */
1335 if (h->got.refcount <= 0 && h->plt.refcount <= 0)
1336 return TRUE;
1337
1338 dynobj = elf_hash_table (info)->dynobj;
1339 if (dynobj == NULL)
1340 return TRUE;
1341
1342 sgot = bfd_get_section_by_name (dynobj, ".got");
1343 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1344
1345 if (!elf_hash_table (info)->dynamic_sections_created
1346 || (info->shared && info->symbolic))
1347 {
1348 h->got.refcount = 0;
1349 h->got.offset = (bfd_vma) -1;
1350 h->plt.refcount = 0;
1351 h->plt.offset = (bfd_vma) -1;
1352 }
1353 else if (h->got.refcount > 0)
1354 {
1355 /* Make sure this symbol is output as a dynamic symbol. */
1356 if (h->dynindx == -1)
1357 {
1358 if (!bfd_elf_link_record_dynamic_symbol (info, h))
1359 return FALSE;
1360 }
1361
1362 /* Allocate space in the .got and .rela.got sections. */
1363 sgot->size += 4;
1364 srelgot->size += sizeof (Elf32_External_Rela);
1365 }
1366
1367 return TRUE;
1368 }
1369
1370 /* Relocate an VAX ELF section. */
1371
1372 static bfd_boolean
1373 elf_vax_relocate_section (bfd *output_bfd,
1374 struct bfd_link_info *info,
1375 bfd *input_bfd,
1376 asection *input_section,
1377 bfd_byte *contents,
1378 Elf_Internal_Rela *relocs,
1379 Elf_Internal_Sym *local_syms,
1380 asection **local_sections)
1381 {
1382 bfd *dynobj;
1383 Elf_Internal_Shdr *symtab_hdr;
1384 struct elf_link_hash_entry **sym_hashes;
1385 bfd_vma *local_got_offsets;
1386 bfd_vma plt_index;
1387 bfd_vma got_offset;
1388 asection *sgot;
1389 asection *splt;
1390 asection *sgotplt;
1391 asection *sreloc;
1392 Elf_Internal_Rela *rel;
1393 Elf_Internal_Rela *relend;
1394
1395 dynobj = elf_hash_table (info)->dynobj;
1396 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1397 sym_hashes = elf_sym_hashes (input_bfd);
1398 local_got_offsets = elf_local_got_offsets (input_bfd);
1399
1400 sgot = NULL;
1401 splt = NULL;
1402 sgotplt = NULL;
1403 sreloc = NULL;
1404
1405 rel = relocs;
1406 relend = relocs + input_section->reloc_count;
1407 for (; rel < relend; rel++)
1408 {
1409 int r_type;
1410 reloc_howto_type *howto;
1411 unsigned long r_symndx;
1412 struct elf_link_hash_entry *h;
1413 Elf_Internal_Sym *sym;
1414 asection *sec;
1415 bfd_vma relocation;
1416 bfd_reloc_status_type r;
1417
1418 r_type = ELF32_R_TYPE (rel->r_info);
1419 if (r_type < 0 || r_type >= (int) R_VAX_max)
1420 {
1421 bfd_set_error (bfd_error_bad_value);
1422 return FALSE;
1423 }
1424 howto = howto_table + r_type;
1425
1426 r_symndx = ELF32_R_SYM (rel->r_info);
1427 h = NULL;
1428 sym = NULL;
1429 sec = NULL;
1430 if (r_symndx < symtab_hdr->sh_info)
1431 {
1432 sym = local_syms + r_symndx;
1433 sec = local_sections[r_symndx];
1434 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1435 }
1436 else
1437 {
1438 bfd_boolean unresolved_reloc;
1439 bfd_boolean warned;
1440
1441 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1442 r_symndx, symtab_hdr, sym_hashes,
1443 h, sec, relocation,
1444 unresolved_reloc, warned);
1445
1446 if ((h->root.type == bfd_link_hash_defined
1447 || h->root.type == bfd_link_hash_defweak)
1448 && ((r_type == R_VAX_PLT32
1449 && h->plt.offset != (bfd_vma) -1
1450 && elf_hash_table (info)->dynamic_sections_created)
1451 || (r_type == R_VAX_GOT32
1452 && strcmp (h->root.root.string,
1453 "_GLOBAL_OFFSET_TABLE_") != 0
1454 && elf_hash_table (info)->dynamic_sections_created
1455 && (! info->shared
1456 || (! info->symbolic && h->dynindx != -1)
1457 || !h->def_regular))
1458 || (info->shared
1459 && ((! info->symbolic && h->dynindx != -1)
1460 || !h->def_regular)
1461 && ((input_section->flags & SEC_ALLOC) != 0
1462 /* DWARF will emit R_VAX_32 relocations in its
1463 sections against symbols defined externally
1464 in shared libraries. We can't do anything
1465 with them here. */
1466
1467 || ((input_section->flags & SEC_DEBUGGING) != 0
1468 && h->def_dynamic))
1469 && (r_type == R_VAX_8
1470 || r_type == R_VAX_16
1471 || r_type == R_VAX_32
1472 || r_type == R_VAX_PC8
1473 || r_type == R_VAX_PC16
1474 || r_type == R_VAX_PC32))))
1475 /* In these cases, we don't need the relocation
1476 value. We check specially because in some
1477 obscure cases sec->output_section will be NULL. */
1478 relocation = 0;
1479 }
1480
1481 if (sec != NULL && elf_discarded_section (sec))
1482 {
1483 /* For relocs against symbols from removed linkonce sections,
1484 or sections discarded by a linker script, we just want the
1485 section contents zeroed. Avoid any special processing. */
1486 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
1487 rel->r_info = 0;
1488 rel->r_addend = 0;
1489 continue;
1490 }
1491
1492 if (info->relocatable)
1493 continue;
1494
1495 switch (r_type)
1496 {
1497 case R_VAX_GOT32:
1498 /* Relocation is to the address of the entry for this symbol
1499 in the global offset table. */
1500 if (h == NULL || h->got.offset == (bfd_vma) -1)
1501 break;
1502
1503 /* Relocation is the offset of the entry for this symbol in
1504 the global offset table. */
1505
1506 {
1507 bfd_vma off;
1508
1509 if (sgot == NULL)
1510 {
1511 sgot = bfd_get_section_by_name (dynobj, ".got");
1512 BFD_ASSERT (sgot != NULL);
1513 }
1514
1515 BFD_ASSERT (h != NULL);
1516 off = h->got.offset;
1517 BFD_ASSERT (off != (bfd_vma) -1);
1518 BFD_ASSERT (off < sgot->size);
1519
1520 if (info->shared
1521 && h->dynindx == -1
1522 && h->def_regular)
1523 {
1524 /* The symbol was forced to be local
1525 because of a version file.. We must initialize
1526 this entry in the global offset table. Since
1527 the offset must always be a multiple of 4, we
1528 use the least significant bit to record whether
1529 we have initialized it already.
1530
1531 When doing a dynamic link, we create a .rela.got
1532 relocation entry to initialize the value. This
1533 is done in the finish_dynamic_symbol routine. */
1534 if ((off & 1) != 0)
1535 off &= ~1;
1536 else
1537 {
1538 bfd_put_32 (output_bfd, relocation + rel->r_addend,
1539 sgot->contents + off);
1540 h->got.offset |= 1;
1541 }
1542 } else {
1543 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off);
1544 }
1545
1546 relocation = sgot->output_offset + off;
1547 /* The GOT relocation uses the addend. */
1548 rel->r_addend = 0;
1549
1550 /* Change the reference to be indirect. */
1551 contents[rel->r_offset - 1] |= 0x10;
1552 relocation += sgot->output_section->vma;
1553 }
1554 break;
1555
1556 case R_VAX_PLT32:
1557 /* Relocation is to the entry for this symbol in the
1558 procedure linkage table. */
1559
1560 /* Resolve a PLTxx reloc against a local symbol directly,
1561 without using the procedure linkage table. */
1562 if (h == NULL)
1563 break;
1564
1565 if (h->plt.offset == (bfd_vma) -1
1566 || !elf_hash_table (info)->dynamic_sections_created)
1567 {
1568 /* We didn't make a PLT entry for this symbol. This
1569 happens when statically linking PIC code, or when
1570 using -Bsymbolic. */
1571 break;
1572 }
1573
1574 if (splt == NULL)
1575 {
1576 splt = bfd_get_section_by_name (dynobj, ".plt");
1577 BFD_ASSERT (splt != NULL);
1578 }
1579
1580 if (sgotplt == NULL)
1581 {
1582 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1583 BFD_ASSERT (splt != NULL);
1584 }
1585
1586 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1587
1588 /* Get the offset into the .got table of the entry that
1589 corresponds to this function. Each .got entry is 4 bytes.
1590 The first two are reserved. */
1591 got_offset = (plt_index + 3) * 4;
1592
1593 /* We want the relocate to point into the .got.plt instead
1594 of the plt itself. */
1595 relocation = (sgotplt->output_section->vma
1596 + sgotplt->output_offset
1597 + got_offset);
1598 contents[rel->r_offset-1] |= 0x10; /* make indirect */
1599 if (rel->r_addend == 2)
1600 {
1601 h->plt.offset |= 1;
1602 }
1603 else if (rel->r_addend != 0)
1604 (*_bfd_error_handler)
1605 (_("%s: warning: PLT addend of %d to `%s' from %s section ignored"),
1606 bfd_get_filename (input_bfd), rel->r_addend,
1607 h->root.root.string,
1608 bfd_get_section_name (input_bfd, input_section));
1609 rel->r_addend = 0;
1610
1611 break;
1612
1613 case R_VAX_PC8:
1614 case R_VAX_PC16:
1615 case R_VAX_PC32:
1616 if (h == NULL)
1617 break;
1618 /* Fall through. */
1619 case R_VAX_8:
1620 case R_VAX_16:
1621 case R_VAX_32:
1622 if (info->shared
1623 && r_symndx != 0
1624 && (input_section->flags & SEC_ALLOC) != 0
1625 && ((r_type != R_VAX_PC8
1626 && r_type != R_VAX_PC16
1627 && r_type != R_VAX_PC32)
1628 || ((input_section->flags & SEC_CODE)
1629 && (!info->symbolic
1630 || (!h->def_regular && h->type != STT_SECTION)))))
1631 {
1632 Elf_Internal_Rela outrel;
1633 bfd_byte *loc;
1634 bfd_boolean skip, relocate;
1635
1636 /* When generating a shared object, these relocations
1637 are copied into the output file to be resolved at run
1638 time. */
1639 if (sreloc == NULL)
1640 {
1641 const char *name;
1642
1643 name = (bfd_elf_string_from_elf_section
1644 (input_bfd,
1645 elf_elfheader (input_bfd)->e_shstrndx,
1646 elf_section_data (input_section)->rel_hdr.sh_name));
1647 if (name == NULL)
1648 return FALSE;
1649
1650 BFD_ASSERT (CONST_STRNEQ (name, ".rela")
1651 && strcmp (bfd_get_section_name (input_bfd,
1652 input_section),
1653 name + 5) == 0);
1654
1655 sreloc = bfd_get_section_by_name (dynobj, name);
1656 BFD_ASSERT (sreloc != NULL);
1657 }
1658
1659 skip = FALSE;
1660 relocate = FALSE;
1661
1662 outrel.r_offset =
1663 _bfd_elf_section_offset (output_bfd, info, input_section,
1664 rel->r_offset);
1665 if (outrel.r_offset == (bfd_vma) -1)
1666 skip = TRUE;
1667 if (outrel.r_offset == (bfd_vma) -2)
1668 skip = TRUE, relocate = TRUE;
1669 outrel.r_offset += (input_section->output_section->vma
1670 + input_section->output_offset);
1671
1672 if (skip)
1673 memset (&outrel, 0, sizeof outrel);
1674 /* h->dynindx may be -1 if the symbol was marked to
1675 become local. */
1676 else if (h != NULL
1677 && ((! info->symbolic && h->dynindx != -1)
1678 || !h->def_regular))
1679 {
1680 BFD_ASSERT (h->dynindx != -1);
1681 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1682 outrel.r_addend = relocation + rel->r_addend;
1683 }
1684 else
1685 {
1686 if (r_type == R_VAX_32)
1687 {
1688 relocate = TRUE;
1689 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE);
1690 BFD_ASSERT (bfd_get_signed_32 (input_bfd,
1691 &contents[rel->r_offset]) == 0);
1692 outrel.r_addend = relocation + rel->r_addend;
1693 }
1694 else
1695 {
1696 long indx;
1697
1698 if (bfd_is_abs_section (sec))
1699 indx = 0;
1700 else if (sec == NULL || sec->owner == NULL)
1701 {
1702 bfd_set_error (bfd_error_bad_value);
1703 return FALSE;
1704 }
1705 else
1706 {
1707 asection *osec;
1708
1709 /* We are turning this relocation into one
1710 against a section symbol. It would be
1711 proper to subtract the symbol's value,
1712 osec->vma, from the emitted reloc addend,
1713 but ld.so expects buggy relocs. */
1714 osec = sec->output_section;
1715 indx = elf_section_data (osec)->dynindx;
1716 if (indx == 0)
1717 {
1718 struct elf_link_hash_table *htab;
1719 htab = elf_hash_table (info);
1720 osec = htab->text_index_section;
1721 indx = elf_section_data (osec)->dynindx;
1722 }
1723 BFD_ASSERT (indx != 0);
1724 }
1725
1726 outrel.r_info = ELF32_R_INFO (indx, r_type);
1727 outrel.r_addend = relocation + rel->r_addend;
1728 }
1729 }
1730
1731 if (!strcmp (bfd_get_section_name (input_bfd, input_section),
1732 ".text") != 0 ||
1733 (info->shared
1734 && ELF32_R_TYPE(outrel.r_info) != R_VAX_32
1735 && ELF32_R_TYPE(outrel.r_info) != R_VAX_RELATIVE
1736 && ELF32_R_TYPE(outrel.r_info) != R_VAX_COPY
1737 && ELF32_R_TYPE(outrel.r_info) != R_VAX_JMP_SLOT
1738 && ELF32_R_TYPE(outrel.r_info) != R_VAX_GLOB_DAT))
1739 {
1740 if (h != NULL)
1741 (*_bfd_error_handler)
1742 (_("%s: warning: %s relocation against symbol `%s' from %s section"),
1743 bfd_get_filename (input_bfd), howto->name,
1744 h->root.root.string,
1745 bfd_get_section_name (input_bfd, input_section));
1746 else
1747 (*_bfd_error_handler)
1748 (_("%s: warning: %s relocation to 0x%x from %s section"),
1749 bfd_get_filename (input_bfd), howto->name,
1750 outrel.r_addend,
1751 bfd_get_section_name (input_bfd, input_section));
1752 }
1753 loc = sreloc->contents;
1754 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1755 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1756
1757 /* This reloc will be computed at runtime, so there's no
1758 need to do anything now, except for R_VAX_32
1759 relocations that have been turned into
1760 R_VAX_RELATIVE. */
1761 if (!relocate)
1762 continue;
1763 }
1764
1765 break;
1766
1767 case R_VAX_GNU_VTINHERIT:
1768 case R_VAX_GNU_VTENTRY:
1769 /* These are no-ops in the end. */
1770 continue;
1771
1772 default:
1773 break;
1774 }
1775
1776 /* VAX PCREL relocations are from the end of relocation, not the start.
1777 So subtract the difference from the relocation amount since we can't
1778 add it to the offset. */
1779 if (howto->pc_relative && howto->pcrel_offset)
1780 relocation -= bfd_get_reloc_size(howto);
1781
1782 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1783 contents, rel->r_offset,
1784 relocation, rel->r_addend);
1785
1786 if (r != bfd_reloc_ok)
1787 {
1788 switch (r)
1789 {
1790 default:
1791 case bfd_reloc_outofrange:
1792 abort ();
1793 case bfd_reloc_overflow:
1794 {
1795 const char *name;
1796
1797 if (h != NULL)
1798 name = NULL;
1799 else
1800 {
1801 name = bfd_elf_string_from_elf_section (input_bfd,
1802 symtab_hdr->sh_link,
1803 sym->st_name);
1804 if (name == NULL)
1805 return FALSE;
1806 if (*name == '\0')
1807 name = bfd_section_name (input_bfd, sec);
1808 }
1809 if (!(info->callbacks->reloc_overflow
1810 (info, (h ? &h->root : NULL), name, howto->name,
1811 (bfd_vma) 0, input_bfd, input_section,
1812 rel->r_offset)))
1813 return FALSE;
1814 }
1815 break;
1816 }
1817 }
1818 }
1819
1820 return TRUE;
1821 }
1822
1823 /* Finish up dynamic symbol handling. We set the contents of various
1824 dynamic sections here. */
1825
1826 static bfd_boolean
1827 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info,
1828 struct elf_link_hash_entry *h,
1829 Elf_Internal_Sym *sym)
1830 {
1831 bfd *dynobj;
1832
1833 dynobj = elf_hash_table (info)->dynobj;
1834
1835 if (h->plt.offset != (bfd_vma) -1)
1836 {
1837 asection *splt;
1838 asection *sgot;
1839 asection *srela;
1840 bfd_vma plt_index;
1841 bfd_vma got_offset;
1842 bfd_vma addend;
1843 Elf_Internal_Rela rela;
1844 bfd_byte *loc;
1845
1846 /* This symbol has an entry in the procedure linkage table. Set
1847 it up. */
1848 BFD_ASSERT (h->dynindx != -1);
1849
1850 splt = bfd_get_section_by_name (dynobj, ".plt");
1851 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1852 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1853 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1854
1855 addend = 2 * (h->plt.offset & 1);
1856 h->plt.offset &= ~1;
1857
1858 /* Get the index in the procedure linkage table which
1859 corresponds to this symbol. This is the index of this symbol
1860 in all the symbols for which we are making plt entries. The
1861 first entry in the procedure linkage table is reserved. */
1862 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1863
1864 /* Get the offset into the .got table of the entry that
1865 corresponds to this function. Each .got entry is 4 bytes.
1866 The first two are reserved. */
1867 got_offset = (plt_index + 3) * 4;
1868
1869 /* Fill in the entry in the procedure linkage table. */
1870 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry,
1871 PLT_ENTRY_SIZE);
1872
1873 /* The offset is relative to the first extension word. */
1874 bfd_put_32 (output_bfd,
1875 -(h->plt.offset + 8),
1876 splt->contents + h->plt.offset + 4);
1877
1878 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1879 splt->contents + h->plt.offset + 8);
1880
1881 /* Fill in the entry in the global offset table. */
1882 bfd_put_32 (output_bfd,
1883 (splt->output_section->vma
1884 + splt->output_offset
1885 + h->plt.offset) + addend,
1886 sgot->contents + got_offset);
1887
1888 /* Fill in the entry in the .rela.plt section. */
1889 rela.r_offset = (sgot->output_section->vma
1890 + sgot->output_offset
1891 + got_offset);
1892 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT);
1893 rela.r_addend = addend;
1894 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1895 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1896
1897 if (!h->def_regular)
1898 {
1899 /* Mark the symbol as undefined, rather than as defined in
1900 the .plt section. Leave the value alone. */
1901 sym->st_shndx = SHN_UNDEF;
1902 }
1903 }
1904
1905 if (h->got.offset != (bfd_vma) -1)
1906 {
1907 asection *sgot;
1908 asection *srela;
1909 Elf_Internal_Rela rela;
1910 bfd_byte *loc;
1911
1912 /* This symbol has an entry in the global offset table. Set it
1913 up. */
1914 sgot = bfd_get_section_by_name (dynobj, ".got");
1915 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1916 BFD_ASSERT (sgot != NULL && srela != NULL);
1917
1918 rela.r_offset = (sgot->output_section->vma
1919 + sgot->output_offset
1920 + (h->got.offset &~ 1));
1921
1922 /* If the symbol was forced to be local because of a version file
1923 locally we just want to emit a RELATIVE reloc. The entry in
1924 the global offset table will already have been initialized in
1925 the relocate_section function. */
1926 if (info->shared
1927 && h->dynindx == -1
1928 && h->def_regular)
1929 {
1930 rela.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE);
1931 }
1932 else
1933 {
1934 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT);
1935 }
1936 rela.r_addend = bfd_get_signed_32 (output_bfd,
1937 (sgot->contents
1938 + (h->got.offset & ~1)));
1939
1940 loc = srela->contents;
1941 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1942 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1943 }
1944
1945 if (h->needs_copy)
1946 {
1947 asection *s;
1948 Elf_Internal_Rela rela;
1949 bfd_byte *loc;
1950
1951 /* This symbol needs a copy reloc. Set it up. */
1952 BFD_ASSERT (h->dynindx != -1
1953 && (h->root.type == bfd_link_hash_defined
1954 || h->root.type == bfd_link_hash_defweak));
1955
1956 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1957 ".rela.bss");
1958 BFD_ASSERT (s != NULL);
1959
1960 rela.r_offset = (h->root.u.def.value
1961 + h->root.u.def.section->output_section->vma
1962 + h->root.u.def.section->output_offset);
1963 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY);
1964 rela.r_addend = 0;
1965 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1966 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1967 }
1968
1969 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1970 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1971 || h == elf_hash_table (info)->hgot)
1972 sym->st_shndx = SHN_ABS;
1973
1974 return TRUE;
1975 }
1976
1977 /* Finish up the dynamic sections. */
1978
1979 static bfd_boolean
1980 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1981 {
1982 bfd *dynobj;
1983 asection *sgot;
1984 asection *sdyn;
1985
1986 dynobj = elf_hash_table (info)->dynobj;
1987
1988 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1989 BFD_ASSERT (sgot != NULL);
1990 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1991
1992 if (elf_hash_table (info)->dynamic_sections_created)
1993 {
1994 asection *splt;
1995 Elf32_External_Dyn *dyncon, *dynconend;
1996
1997 splt = bfd_get_section_by_name (dynobj, ".plt");
1998 BFD_ASSERT (splt != NULL && sdyn != NULL);
1999
2000 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2001 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2002 for (; dyncon < dynconend; dyncon++)
2003 {
2004 Elf_Internal_Dyn dyn;
2005 const char *name;
2006 asection *s;
2007
2008 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2009
2010 switch (dyn.d_tag)
2011 {
2012 default:
2013 break;
2014
2015 case DT_PLTGOT:
2016 name = ".got";
2017 goto get_vma;
2018 case DT_JMPREL:
2019 name = ".rela.plt";
2020 get_vma:
2021 s = bfd_get_section_by_name (output_bfd, name);
2022 BFD_ASSERT (s != NULL);
2023 dyn.d_un.d_ptr = s->vma;
2024 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2025 break;
2026
2027 case DT_PLTRELSZ:
2028 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2029 BFD_ASSERT (s != NULL);
2030 dyn.d_un.d_val = s->size;
2031 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2032 break;
2033
2034 case DT_RELASZ:
2035 /* The procedure linkage table relocs (DT_JMPREL) should
2036 not be included in the overall relocs (DT_RELA).
2037 Therefore, we override the DT_RELASZ entry here to
2038 make it not include the JMPREL relocs. Since the
2039 linker script arranges for .rela.plt to follow all
2040 other relocation sections, we don't have to worry
2041 about changing the DT_RELA entry. */
2042 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2043 if (s != NULL)
2044 dyn.d_un.d_val -= s->size;
2045 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2046 break;
2047 }
2048 }
2049
2050 /* Fill in the first entry in the procedure linkage table. */
2051 if (splt->size > 0)
2052 {
2053 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE);
2054 bfd_put_32 (output_bfd,
2055 (sgot->output_section->vma
2056 + sgot->output_offset + 4
2057 - (splt->output_section->vma + 6)),
2058 splt->contents + 2);
2059 bfd_put_32 (output_bfd,
2060 (sgot->output_section->vma
2061 + sgot->output_offset + 8
2062 - (splt->output_section->vma + 12)),
2063 splt->contents + 8);
2064 elf_section_data (splt->output_section)->this_hdr.sh_entsize
2065 = PLT_ENTRY_SIZE;
2066 }
2067 }
2068
2069 /* Fill in the first three entries in the global offset table. */
2070 if (sgot->size > 0)
2071 {
2072 if (sdyn == NULL)
2073 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2074 else
2075 bfd_put_32 (output_bfd,
2076 sdyn->output_section->vma + sdyn->output_offset,
2077 sgot->contents);
2078 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2079 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2080 }
2081
2082 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2083
2084 return TRUE;
2085 }
2086
2087 #define TARGET_LITTLE_SYM bfd_elf32_vax_vec
2088 #define TARGET_LITTLE_NAME "elf32-vax"
2089 #define ELF_MACHINE_CODE EM_VAX
2090 #define ELF_MAXPAGESIZE 0x1000
2091
2092 #define elf_backend_create_dynamic_sections \
2093 _bfd_elf_create_dynamic_sections
2094 #define bfd_elf32_bfd_link_hash_table_create \
2095 elf_vax_link_hash_table_create
2096 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
2097
2098 #define elf_backend_check_relocs elf_vax_check_relocs
2099 #define elf_backend_adjust_dynamic_symbol \
2100 elf_vax_adjust_dynamic_symbol
2101 #define elf_backend_size_dynamic_sections \
2102 elf_vax_size_dynamic_sections
2103 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
2104 #define elf_backend_relocate_section elf_vax_relocate_section
2105 #define elf_backend_finish_dynamic_symbol \
2106 elf_vax_finish_dynamic_symbol
2107 #define elf_backend_finish_dynamic_sections \
2108 elf_vax_finish_dynamic_sections
2109 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook
2110 #define elf_backend_gc_sweep_hook elf_vax_gc_sweep_hook
2111 #define bfd_elf32_bfd_merge_private_bfd_data \
2112 elf32_vax_merge_private_bfd_data
2113 #define bfd_elf32_bfd_set_private_flags \
2114 elf32_vax_set_private_flags
2115 #define bfd_elf32_bfd_print_private_bfd_data \
2116 elf32_vax_print_private_bfd_data
2117
2118 #define elf_backend_can_gc_sections 1
2119 #define elf_backend_want_got_plt 1
2120 #define elf_backend_plt_readonly 1
2121 #define elf_backend_want_plt_sym 0
2122 #define elf_backend_got_header_size 16
2123 #define elf_backend_rela_normal 1
2124
2125 #include "elf32-target.h"