1 /* VAX series support for 32-bit ELF
2 Copyright (C) 1993-2020 Free Software Foundation, Inc.
3 Contributed by Matt Thomas <matt@3am-software.com>.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/vax.h"
28
29 static reloc_howto_type *reloc_type_lookup (bfd *, bfd_reloc_code_real_type);
30 static bfd_boolean rtype_to_howto (bfd *, arelent *, Elf_Internal_Rela *);
31 static struct bfd_hash_entry *elf_vax_link_hash_newfunc (struct bfd_hash_entry *,
32 struct bfd_hash_table *,
33 const char *);
34 static struct bfd_link_hash_table *elf_vax_link_hash_table_create (bfd *);
35 static bfd_boolean elf_vax_check_relocs (bfd *, struct bfd_link_info *,
36 asection *, const Elf_Internal_Rela *);
37 static bfd_boolean elf_vax_adjust_dynamic_symbol (struct bfd_link_info *,
38 struct elf_link_hash_entry *);
39 static bfd_boolean elf_vax_size_dynamic_sections (bfd *, struct bfd_link_info *);
40 static bfd_boolean elf_vax_relocate_section (bfd *, struct bfd_link_info *,
41 bfd *, asection *, bfd_byte *,
42 Elf_Internal_Rela *,
43 Elf_Internal_Sym *, asection **);
44 static bfd_boolean elf_vax_finish_dynamic_symbol (bfd *, struct bfd_link_info *,
45 struct elf_link_hash_entry *,
46 Elf_Internal_Sym *);
47 static bfd_boolean elf_vax_finish_dynamic_sections (bfd *,
48 struct bfd_link_info *);
49 static bfd_vma elf_vax_plt_sym_val (bfd_vma, const asection *,
50 const arelent *);
51
52 static bfd_boolean elf32_vax_set_private_flags (bfd *, flagword);
53 static bfd_boolean elf32_vax_print_private_bfd_data (bfd *, void *);
54
55 static reloc_howto_type howto_table[] = {
56 HOWTO (R_VAX_NONE, /* type */
57 0, /* rightshift */
58 3, /* size (0 = byte, 1 = short, 2 = long) */
59 0, /* bitsize */
60 FALSE, /* pc_relative */
61 0, /* bitpos */
62 complain_overflow_dont, /* complain_on_overflow */
63 bfd_elf_generic_reloc, /* special_function */
64 "R_VAX_NONE", /* name */
65 FALSE, /* partial_inplace */
66 0, /* src_mask */
67 0x00000000, /* dst_mask */
68 FALSE), /* pcrel_offset */
69
70 HOWTO (R_VAX_32, /* type */
71 0, /* rightshift */
72 2, /* size (0 = byte, 1 = short, 2 = long) */
73 32, /* bitsize */
74 FALSE, /* pc_relative */
75 0, /* bitpos */
76 complain_overflow_bitfield, /* complain_on_overflow */
77 bfd_elf_generic_reloc, /* special_function */
78 "R_VAX_32", /* name */
79 FALSE, /* partial_inplace */
80 0, /* src_mask */
81 0xffffffff, /* dst_mask */
82 FALSE), /* pcrel_offset */
83
84 HOWTO (R_VAX_16, /* type */
85 0, /* rightshift */
86 1, /* size (0 = byte, 1 = short, 2 = long) */
87 16, /* bitsize */
88 FALSE, /* pc_relative */
89 0, /* bitpos */
90 complain_overflow_bitfield, /* complain_on_overflow */
91 bfd_elf_generic_reloc, /* special_function */
92 "R_VAX_16", /* name */
93 FALSE, /* partial_inplace */
94 0, /* src_mask */
95 0x0000ffff, /* dst_mask */
96 FALSE), /* pcrel_offset */
97
98 HOWTO (R_VAX_8, /* type */
99 0, /* rightshift */
100 0, /* size (0 = byte, 1 = short, 2 = long) */
101 8, /* bitsize */
102 FALSE, /* pc_relative */
103 0, /* bitpos */
104 complain_overflow_bitfield, /* complain_on_overflow */
105 bfd_elf_generic_reloc, /* special_function */
106 "R_VAX_8", /* name */
107 FALSE, /* partial_inplace */
108 0, /* src_mask */
109 0x000000ff, /* dst_mask */
110 FALSE), /* pcrel_offset */
111
112 HOWTO (R_VAX_PC32, /* type */
113 0, /* rightshift */
114 2, /* size (0 = byte, 1 = short, 2 = long) */
115 32, /* bitsize */
116 TRUE, /* pc_relative */
117 0, /* bitpos */
118 complain_overflow_bitfield, /* complain_on_overflow */
119 bfd_elf_generic_reloc, /* special_function */
120 "R_VAX_PC32", /* name */
121 FALSE, /* partial_inplace */
122 0, /* src_mask */
123 0xffffffff, /* dst_mask */
124 TRUE), /* pcrel_offset */
125
126 HOWTO (R_VAX_PC16, /* type */
127 0, /* rightshift */
128 1, /* size (0 = byte, 1 = short, 2 = long) */
129 16, /* bitsize */
130 TRUE, /* pc_relative */
131 0, /* bitpos */
132 complain_overflow_signed, /* complain_on_overflow */
133 bfd_elf_generic_reloc, /* special_function */
134 "R_VAX_PC16", /* name */
135 FALSE, /* partial_inplace */
136 0, /* src_mask */
137 0x0000ffff, /* dst_mask */
138 TRUE), /* pcrel_offset */
139
140 HOWTO (R_VAX_PC8, /* type */
141 0, /* rightshift */
142 0, /* size (0 = byte, 1 = short, 2 = long) */
143 8, /* bitsize */
144 TRUE, /* pc_relative */
145 0, /* bitpos */
146 complain_overflow_signed, /* complain_on_overflow */
147 bfd_elf_generic_reloc, /* special_function */
148 "R_VAX_PC8", /* name */
149 FALSE, /* partial_inplace */
150 0, /* src_mask */
151 0x000000ff, /* dst_mask */
152 TRUE), /* pcrel_offset */
153
154 HOWTO (R_VAX_GOT32, /* type */
155 0, /* rightshift */
156 2, /* size (0 = byte, 1 = short, 2 = long) */
157 32, /* bitsize */
158 TRUE, /* pc_relative */
159 0, /* bitpos */
160 complain_overflow_bitfield, /* complain_on_overflow */
161 bfd_elf_generic_reloc, /* special_function */
162 "R_VAX_GOT32", /* name */
163 FALSE, /* partial_inplace */
164 0, /* src_mask */
165 0xffffffff, /* dst_mask */
166 TRUE), /* pcrel_offset */
167
168 EMPTY_HOWTO (-1),
169 EMPTY_HOWTO (-1),
170 EMPTY_HOWTO (-1),
171 EMPTY_HOWTO (-1),
172 EMPTY_HOWTO (-1),
173
174 HOWTO (R_VAX_PLT32, /* type */
175 0, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 32, /* bitsize */
178 TRUE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_bitfield, /* complain_on_overflow */
181 bfd_elf_generic_reloc, /* special_function */
182 "R_VAX_PLT32", /* name */
183 FALSE, /* partial_inplace */
184 0, /* src_mask */
185 0xffffffff, /* dst_mask */
186 TRUE), /* pcrel_offset */
187
188 EMPTY_HOWTO (-1),
189 EMPTY_HOWTO (-1),
190 EMPTY_HOWTO (-1),
191 EMPTY_HOWTO (-1),
192 EMPTY_HOWTO (-1),
193
194 HOWTO (R_VAX_COPY, /* type */
195 0, /* rightshift */
196 0, /* size (0 = byte, 1 = short, 2 = long) */
197 0, /* bitsize */
198 FALSE, /* pc_relative */
199 0, /* bitpos */
200 complain_overflow_dont, /* complain_on_overflow */
201 bfd_elf_generic_reloc, /* special_function */
202 "R_VAX_COPY", /* name */
203 FALSE, /* partial_inplace */
204 0, /* src_mask */
205 0xffffffff, /* dst_mask */
206 FALSE), /* pcrel_offset */
207
208 HOWTO (R_VAX_GLOB_DAT, /* type */
209 0, /* rightshift */
210 2, /* size (0 = byte, 1 = short, 2 = long) */
211 32, /* bitsize */
212 FALSE, /* pc_relative */
213 0, /* bitpos */
214 complain_overflow_dont, /* complain_on_overflow */
215 bfd_elf_generic_reloc, /* special_function */
216 "R_VAX_GLOB_DAT", /* name */
217 FALSE, /* partial_inplace */
218 0, /* src_mask */
219 0xffffffff, /* dst_mask */
220 FALSE), /* pcrel_offset */
221
222 HOWTO (R_VAX_JMP_SLOT, /* type */
223 0, /* rightshift */
224 2, /* size (0 = byte, 1 = short, 2 = long) */
225 32, /* bitsize */
226 FALSE, /* pc_relative */
227 0, /* bitpos */
228 complain_overflow_dont, /* complain_on_overflow */
229 bfd_elf_generic_reloc, /* special_function */
230 "R_VAX_JMP_SLOT", /* name */
231 FALSE, /* partial_inplace */
232 0, /* src_mask */
233 0xffffffff, /* dst_mask */
234 FALSE), /* pcrel_offset */
235
236 HOWTO (R_VAX_RELATIVE, /* type */
237 0, /* rightshift */
238 2, /* size (0 = byte, 1 = short, 2 = long) */
239 32, /* bitsize */
240 FALSE, /* pc_relative */
241 0, /* bitpos */
242 complain_overflow_dont, /* complain_on_overflow */
243 bfd_elf_generic_reloc, /* special_function */
244 "R_VAX_RELATIVE", /* name */
245 FALSE, /* partial_inplace */
246 0, /* src_mask */
247 0xffffffff, /* dst_mask */
248 FALSE), /* pcrel_offset */
249
250 /* GNU extension to record C++ vtable hierarchy */
251 HOWTO (R_VAX_GNU_VTINHERIT, /* type */
252 0, /* rightshift */
253 2, /* size (0 = byte, 1 = short, 2 = long) */
254 0, /* bitsize */
255 FALSE, /* pc_relative */
256 0, /* bitpos */
257 complain_overflow_dont, /* complain_on_overflow */
258 NULL, /* special_function */
259 "R_VAX_GNU_VTINHERIT", /* name */
260 FALSE, /* partial_inplace */
261 0, /* src_mask */
262 0, /* dst_mask */
263 FALSE), /* pcrel_offset */
264
265 /* GNU extension to record C++ vtable member usage */
266 HOWTO (R_VAX_GNU_VTENTRY, /* type */
267 0, /* rightshift */
268 2, /* size (0 = byte, 1 = short, 2 = long) */
269 0, /* bitsize */
270 FALSE, /* pc_relative */
271 0, /* bitpos */
272 complain_overflow_dont, /* complain_on_overflow */
273 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
274 "R_VAX_GNU_VTENTRY", /* name */
275 FALSE, /* partial_inplace */
276 0, /* src_mask */
277 0, /* dst_mask */
278 FALSE), /* pcrel_offset */
279 };
280
281 static bfd_boolean
rtype_to_howto(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)282 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst)
283 {
284 unsigned int r_type;
285
286 r_type = ELF32_R_TYPE (dst->r_info);
287 if (r_type >= R_VAX_max)
288 {
289 /* xgettext:c-format */
290 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
291 abfd, r_type);
292 bfd_set_error (bfd_error_bad_value);
293 return FALSE;
294 }
295 cache_ptr->howto = &howto_table[r_type];
296 return TRUE;
297 }
298
299 #define elf_info_to_howto rtype_to_howto
300
301 static const struct
302 {
303 bfd_reloc_code_real_type bfd_val;
304 int elf_val;
305 } reloc_map[] = {
306 { BFD_RELOC_NONE, R_VAX_NONE },
307 { BFD_RELOC_32, R_VAX_32 },
308 { BFD_RELOC_16, R_VAX_16 },
309 { BFD_RELOC_8, R_VAX_8 },
310 { BFD_RELOC_32_PCREL, R_VAX_PC32 },
311 { BFD_RELOC_16_PCREL, R_VAX_PC16 },
312 { BFD_RELOC_8_PCREL, R_VAX_PC8 },
313 { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 },
314 { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 },
315 { BFD_RELOC_NONE, R_VAX_COPY },
316 { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT },
317 { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT },
318 { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE },
319 { BFD_RELOC_CTOR, R_VAX_32 },
320 { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT },
321 { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY },
322 };
323
324 static reloc_howto_type *
reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)325 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code)
326 {
327 unsigned int i;
328 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
329 {
330 if (reloc_map[i].bfd_val == code)
331 return &howto_table[reloc_map[i].elf_val];
332 }
333 return 0;
334 }
335
336 static reloc_howto_type *
reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)337 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
338 const char *r_name)
339 {
340 unsigned int i;
341
342 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++)
343 if (howto_table[i].name != NULL
344 && strcasecmp (howto_table[i].name, r_name) == 0)
345 return &howto_table[i];
346
347 return NULL;
348 }
349
350 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
351 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup
352 #define ELF_ARCH bfd_arch_vax
353 /* end code generated by elf.el */
354
355 /* Functions for the VAX ELF linker. */
356
357 /* The name of the dynamic interpreter. This is put in the .interp
358 section. */
359
360 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so"
361
362 /* The size in bytes of an entry in the procedure linkage table. */
363
364 #define PLT_ENTRY_SIZE 12
365
366 /* The first entry in a procedure linkage table looks like this. See
367 the SVR4 ABI VAX supplement to see how this works. */
368
369 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] =
370 {
371 0xdd, 0xef, /* pushl l^ */
372 0, 0, 0, 0, /* offset to .plt.got + 4 */
373 0x17, 0xff, /* jmp @L^(pc) */
374 0, 0, 0, 0, /* offset to .plt.got + 8 */
375 };
376
377 /* Subsequent entries in a procedure linkage table look like this. */
378
379 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] =
380 {
381 0xfc, 0x0f, /* .word ^M<r11:r2> */
382 0x16, 0xef, /* jsb L^(pc) */
383 0, 0, 0, 0, /* replaced with offset to start of .plt */
384 0, 0, 0, 0, /* index into .rela.plt */
385 };
386
387 /* The VAX linker needs to keep track of the number of relocs that it
388 decides to copy in check_relocs for each symbol. This is so that it
389 can discard PC relative relocs if it doesn't need them when linking
390 with -Bsymbolic. We store the information in a field extending the
391 regular ELF linker hash table. */
392
393 /* This structure keeps track of the number of PC relative relocs we have
394 copied for a given symbol. */
395
396 struct elf_vax_pcrel_relocs_copied
397 {
398 /* Next section. */
399 struct elf_vax_pcrel_relocs_copied *next;
400 /* A section in dynobj. */
401 asection *section;
402 /* Number of relocs copied in this section. */
403 bfd_size_type count;
404 };
405
406 /* VAX ELF linker hash entry. */
407
408 struct elf_vax_link_hash_entry
409 {
410 struct elf_link_hash_entry root;
411
412 /* Number of PC relative relocs copied for this symbol. */
413 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied;
414
415 bfd_vma got_addend;
416 };
417
418 /* Declare this now that the above structures are defined. */
419
420 static bfd_boolean elf_vax_discard_copies (struct elf_vax_link_hash_entry *,
421 void *);
422
423 /* Declare this now that the above structures are defined. */
424
425 static bfd_boolean elf_vax_instantiate_got_entries (struct elf_link_hash_entry *,
426 void *);
427
428 /* Traverse an VAX ELF linker hash table. */
429
430 #define elf_vax_link_hash_traverse(table, func, info) \
431 (elf_link_hash_traverse \
432 ((table), \
433 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \
434 (info)))
435
436 /* Create an entry in an VAX ELF linker hash table. */
437
438 static struct bfd_hash_entry *
elf_vax_link_hash_newfunc(struct bfd_hash_entry * entry,struct bfd_hash_table * table,const char * string)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 *
elf_vax_link_hash_table_create(bfd * abfd)470 elf_vax_link_hash_table_create (bfd *abfd)
471 {
472 struct elf_link_hash_table *ret;
473 size_t amt = sizeof (struct elf_link_hash_table);
474
475 ret = bfd_zmalloc (amt);
476 if (ret == NULL)
477 return NULL;
478
479 if (!_bfd_elf_link_hash_table_init (ret, abfd,
480 elf_vax_link_hash_newfunc,
481 sizeof (struct elf_vax_link_hash_entry),
482 GENERIC_ELF_DATA))
483 {
484 free (ret);
485 return NULL;
486 }
487
488 return &ret->root;
489 }
490
491 /* Keep vax-specific flags in the ELF header */
492 static bfd_boolean
elf32_vax_set_private_flags(bfd * abfd,flagword flags)493 elf32_vax_set_private_flags (bfd *abfd, flagword flags)
494 {
495 elf_elfheader (abfd)->e_flags = flags;
496 elf_flags_init (abfd) = TRUE;
497 return TRUE;
498 }
499
500 /* Merge backend specific data from an object file to the output
501 object file when linking. */
502 static bfd_boolean
elf32_vax_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)503 elf32_vax_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
504 {
505 bfd *obfd = info->output_bfd;
506 flagword in_flags;
507
508 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
509 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
510 return TRUE;
511
512 in_flags = elf_elfheader (ibfd)->e_flags;
513
514 if (!elf_flags_init (obfd))
515 {
516 elf_flags_init (obfd) = TRUE;
517 elf_elfheader (obfd)->e_flags = in_flags;
518 }
519
520 return TRUE;
521 }
522
523 /* Display the flags field */
524 static bfd_boolean
elf32_vax_print_private_bfd_data(bfd * abfd,void * ptr)525 elf32_vax_print_private_bfd_data (bfd *abfd, void * ptr)
526 {
527 FILE *file = (FILE *) ptr;
528
529 BFD_ASSERT (abfd != NULL && ptr != NULL);
530
531 /* Print normal ELF private data. */
532 _bfd_elf_print_private_bfd_data (abfd, ptr);
533
534 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */
535
536 /* xgettext:c-format */
537 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
538
539 if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC)
540 fprintf (file, _(" [nonpic]"));
541
542 if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT)
543 fprintf (file, _(" [d-float]"));
544
545 if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT)
546 fprintf (file, _(" [g-float]"));
547
548 fputc ('\n', file);
549
550 return TRUE;
551 }
552 /* Look through the relocs for a section during the first phase, and
553 allocate space in the global offset table or procedure linkage
554 table. */
555
556 static bfd_boolean
elf_vax_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)557 elf_vax_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec,
558 const Elf_Internal_Rela *relocs)
559 {
560 bfd *dynobj;
561 Elf_Internal_Shdr *symtab_hdr;
562 struct elf_link_hash_entry **sym_hashes;
563 const Elf_Internal_Rela *rel;
564 const Elf_Internal_Rela *rel_end;
565 asection *sreloc;
566
567 if (bfd_link_relocatable (info))
568 return TRUE;
569
570 dynobj = elf_hash_table (info)->dynobj;
571 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
572 sym_hashes = elf_sym_hashes (abfd);
573
574 sreloc = NULL;
575
576 rel_end = relocs + sec->reloc_count;
577 for (rel = relocs; rel < rel_end; rel++)
578 {
579 unsigned long r_symndx;
580 struct elf_link_hash_entry *h;
581
582 r_symndx = ELF32_R_SYM (rel->r_info);
583
584 if (r_symndx < symtab_hdr->sh_info)
585 h = NULL;
586 else
587 {
588 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
589 while (h->root.type == bfd_link_hash_indirect
590 || h->root.type == bfd_link_hash_warning)
591 h = (struct elf_link_hash_entry *) h->root.u.i.link;
592 }
593
594 switch (ELF32_R_TYPE (rel->r_info))
595 {
596 case R_VAX_GOT32:
597 BFD_ASSERT (h != NULL);
598
599 /* If this is a local symbol, we resolve it directly without
600 creating a global offset table entry. */
601 if (h->forced_local
602 || h == elf_hash_table (info)->hgot
603 || h == elf_hash_table (info)->hplt)
604 break;
605
606 /* This symbol requires a global offset table entry. */
607
608 if (dynobj == NULL)
609 {
610 /* Create the .got section. */
611 elf_hash_table (info)->dynobj = dynobj = abfd;
612 if (!_bfd_elf_create_got_section (dynobj, info))
613 return FALSE;
614 }
615
616 if (h != NULL)
617 {
618 struct elf_vax_link_hash_entry *eh;
619
620 eh = (struct elf_vax_link_hash_entry *) h;
621 if (h->got.refcount == -1)
622 {
623 h->got.refcount = 1;
624 eh->got_addend = rel->r_addend;
625 }
626 else
627 {
628 h->got.refcount++;
629 if (eh->got_addend != (bfd_vma) rel->r_addend)
630 _bfd_error_handler
631 /* xgettext:c-format */
632 (_("%pB: warning: GOT addend of %" PRId64 " to `%s' does"
633 " not match previous GOT addend of %" PRId64),
634 abfd, (int64_t) rel->r_addend, h->root.root.string,
635 (int64_t) eh->got_addend);
636
637 }
638 }
639 break;
640
641 case R_VAX_PLT32:
642 /* This symbol requires a procedure linkage table entry. We
643 actually build the entry in adjust_dynamic_symbol,
644 because this might be a case of linking PIC code which is
645 never referenced by a dynamic object, in which case we
646 don't need to generate a procedure linkage table entry
647 after all. */
648 BFD_ASSERT (h != NULL);
649
650 /* If this is a local symbol, we resolve it directly without
651 creating a procedure linkage table entry. */
652 if (h->forced_local)
653 break;
654
655 h->needs_plt = 1;
656 if (h->plt.refcount == -1)
657 h->plt.refcount = 1;
658 else
659 h->plt.refcount++;
660 break;
661
662 case R_VAX_PC8:
663 case R_VAX_PC16:
664 case R_VAX_PC32:
665 /* If we are creating a shared library and this is not a local
666 symbol, we need to copy the reloc into the shared library.
667 However when linking with -Bsymbolic and this is a global
668 symbol which is defined in an object we are including in the
669 link (i.e., DEF_REGULAR is set), then we can resolve the
670 reloc directly. At this point we have not seen all the input
671 files, so it is possible that DEF_REGULAR is not set now but
672 will be set later (it is never cleared). We account for that
673 possibility below by storing information in the
674 pcrel_relocs_copied field of the hash table entry. */
675 if (!(bfd_link_pic (info)
676 && (sec->flags & SEC_ALLOC) != 0
677 && h != NULL
678 && (!info->symbolic
679 || !h->def_regular)))
680 {
681 if (h != NULL
682 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
683 && !h->forced_local)
684 {
685 /* Make sure a plt entry is created for this symbol if
686 it turns out to be a function defined by a dynamic
687 object. */
688 if (h->plt.refcount == -1)
689 h->plt.refcount = 1;
690 else
691 h->plt.refcount++;
692 }
693 break;
694 }
695 /* If this is a local symbol, we can resolve it directly. */
696 if (h != NULL
697 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
698 || h->forced_local))
699 break;
700
701 /* Fall through. */
702 case R_VAX_8:
703 case R_VAX_16:
704 case R_VAX_32:
705 if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
706 {
707 /* Make sure a plt entry is created for this symbol if it
708 turns out to be a function defined by a dynamic object. */
709 if (h->plt.refcount == -1)
710 h->plt.refcount = 1;
711 else
712 h->plt.refcount++;
713 }
714
715 /* Non-GOT reference may need a copy reloc in executable or
716 a dynamic reloc in shared library. */
717 if (h != NULL)
718 h->non_got_ref = 1;
719
720 /* If we are creating a shared library, we need to copy the
721 reloc into the shared library. */
722 if (bfd_link_pic (info)
723 && (sec->flags & SEC_ALLOC) != 0)
724 {
725 /* When creating a shared object, we must copy these
726 reloc types into the output file. We create a reloc
727 section in dynobj and make room for this reloc. */
728 if (sreloc == NULL)
729 {
730 sreloc = _bfd_elf_make_dynamic_reloc_section
731 (sec, dynobj, 2, abfd, /*rela?*/ TRUE);
732
733 if (sreloc == NULL)
734 return FALSE;
735
736 if (sec->flags & SEC_READONLY)
737 info->flags |= DF_TEXTREL;
738 }
739
740 sreloc->size += sizeof (Elf32_External_Rela);
741
742 /* If we are linking with -Bsymbolic, we count the number of
743 PC relative relocations we have entered for this symbol,
744 so that we can discard them again if the symbol is later
745 defined by a regular object. Note that this function is
746 only called if we are using a vaxelf linker hash table,
747 which means that h is really a pointer to an
748 elf_vax_link_hash_entry. */
749 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8
750 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16
751 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32)
752 && info->symbolic)
753 {
754 struct elf_vax_link_hash_entry *eh;
755 struct elf_vax_pcrel_relocs_copied *p;
756
757 eh = (struct elf_vax_link_hash_entry *) h;
758
759 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
760 if (p->section == sreloc)
761 break;
762
763 if (p == NULL)
764 {
765 p = ((struct elf_vax_pcrel_relocs_copied *)
766 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
767 if (p == NULL)
768 return FALSE;
769 p->next = eh->pcrel_relocs_copied;
770 eh->pcrel_relocs_copied = p;
771 p->section = sreloc;
772 p->count = 0;
773 }
774
775 ++p->count;
776 }
777 }
778
779 break;
780
781 /* This relocation describes the C++ object vtable hierarchy.
782 Reconstruct it for later use during GC. */
783 case R_VAX_GNU_VTINHERIT:
784 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
785 return FALSE;
786 break;
787
788 /* This relocation describes which C++ vtable entries are actually
789 used. Record for later use during GC. */
790 case R_VAX_GNU_VTENTRY:
791 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
792 return FALSE;
793 break;
794
795 default:
796 break;
797 }
798 }
799
800 return TRUE;
801 }
802
803 /* Return the section that should be marked against GC for a given
804 relocation. */
805
806 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)807 elf_vax_gc_mark_hook (asection *sec,
808 struct bfd_link_info *info,
809 Elf_Internal_Rela *rel,
810 struct elf_link_hash_entry *h,
811 Elf_Internal_Sym *sym)
812 {
813 if (h != NULL)
814 switch (ELF32_R_TYPE (rel->r_info))
815 {
816 case R_VAX_GNU_VTINHERIT:
817 case R_VAX_GNU_VTENTRY:
818 return NULL;
819 }
820
821 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
822 }
823
824 /* Adjust a symbol defined by a dynamic object and referenced by a
825 regular object. The current definition is in some section of the
826 dynamic object, but we're not including those sections. We have to
827 change the definition to something the rest of the link can
828 understand. */
829
830 static bfd_boolean
elf_vax_adjust_dynamic_symbol(struct bfd_link_info * info,struct elf_link_hash_entry * h)831 elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info,
832 struct elf_link_hash_entry *h)
833 {
834 bfd *dynobj;
835 asection *s;
836
837 dynobj = elf_hash_table (info)->dynobj;
838
839 /* Make sure we know what is going on here. */
840 BFD_ASSERT (dynobj != NULL
841 && (h->needs_plt
842 || h->is_weakalias
843 || (h->def_dynamic
844 && h->ref_regular
845 && !h->def_regular)));
846
847 /* If this is a function, put it in the procedure linkage table. We
848 will fill in the contents of the procedure linkage table later,
849 when we know the address of the .got section. */
850 if (h->type == STT_FUNC
851 || h->needs_plt)
852 {
853 if (h->plt.refcount <= 0
854 || SYMBOL_CALLS_LOCAL (info, h)
855 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
856 && h->root.type == bfd_link_hash_undefweak))
857 {
858 /* This case can occur if we saw a PLTxx reloc in an input
859 file, but the symbol was never referred to by a dynamic
860 object, or if all references were garbage collected. In
861 such a case, we don't actually need to build a procedure
862 linkage table, and we can just do a PCxx reloc instead. */
863 h->plt.offset = (bfd_vma) -1;
864 h->needs_plt = 0;
865 return TRUE;
866 }
867
868 s = elf_hash_table (info)->splt;
869 BFD_ASSERT (s != NULL);
870
871 /* If this is the first .plt entry, make room for the special
872 first entry. */
873 if (s->size == 0)
874 {
875 s->size += PLT_ENTRY_SIZE;
876 }
877
878 /* If this symbol is not defined in a regular file, and we are
879 not generating a shared library, then set the symbol to this
880 location in the .plt. This is required to make function
881 pointers compare as equal between the normal executable and
882 the shared library. */
883 if (!bfd_link_pic (info)
884 && !h->def_regular)
885 {
886 h->root.u.def.section = s;
887 h->root.u.def.value = s->size;
888 }
889
890 h->plt.offset = s->size;
891
892 /* Make room for this entry. */
893 s->size += PLT_ENTRY_SIZE;
894
895 /* We also need to make an entry in the .got.plt section, which
896 will be placed in the .got section by the linker script. */
897
898 s = elf_hash_table (info)->sgotplt;
899 BFD_ASSERT (s != NULL);
900 s->size += 4;
901
902 /* We also need to make an entry in the .rela.plt section. */
903
904 s = elf_hash_table (info)->srelplt;
905 BFD_ASSERT (s != NULL);
906 s->size += sizeof (Elf32_External_Rela);
907
908 return TRUE;
909 }
910
911 /* Reinitialize the plt offset now that it is not used as a reference
912 count any more. */
913 h->plt.offset = (bfd_vma) -1;
914
915 /* If this is a weak symbol, and there is a real definition, the
916 processor independent code will have arranged for us to see the
917 real definition first, and we can just use the same value. */
918 if (h->is_weakalias)
919 {
920 struct elf_link_hash_entry *def = weakdef (h);
921 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
922 h->root.u.def.section = def->root.u.def.section;
923 h->root.u.def.value = def->root.u.def.value;
924 return TRUE;
925 }
926
927 /* This is a reference to a symbol defined by a dynamic object which
928 is not a function. */
929
930 /* If we are creating a shared library, we must presume that the
931 only references to the symbol are via the global offset table.
932 For such cases we need not do anything here; the relocations will
933 be handled correctly by relocate_section. */
934 if (bfd_link_pic (info))
935 return TRUE;
936
937 /* If there are no references to this symbol that do not use the
938 GOT relocation, we don't need to generate a copy reloc. */
939 if (!h->non_got_ref)
940 return TRUE;
941
942 /* We must allocate the symbol in our .dynbss section, which will
943 become part of the .bss section of the executable. There will be
944 an entry for this symbol in the .dynsym section. The dynamic
945 object will contain position independent code, so all references
946 from the dynamic object to this symbol will go through the global
947 offset table. The dynamic linker will use the .dynsym entry to
948 determine the address it must put in the global offset table, so
949 both the dynamic object and the regular object will refer to the
950 same memory location for the variable. */
951
952 s = bfd_get_linker_section (dynobj, ".dynbss");
953 BFD_ASSERT (s != NULL);
954
955 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to
956 copy the initial value out of the dynamic object and into the
957 runtime process image. We need to remember the offset into the
958 .rela.bss section we are going to use. */
959 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
960 {
961 asection *srel;
962
963 srel = bfd_get_linker_section (dynobj, ".rela.bss");
964 BFD_ASSERT (srel != NULL);
965 srel->size += sizeof (Elf32_External_Rela);
966 h->needs_copy = 1;
967 }
968
969 return _bfd_elf_adjust_dynamic_copy (info, h, s);
970 }
971
972 /* This function is called via elf_link_hash_traverse. It resets GOT
973 and PLT (.GOT) reference counts back to -1 so normal PC32 relocation
974 will be done. */
975
976 static bfd_boolean
elf_vax_discard_got_entries(struct elf_link_hash_entry * h,void * infoptr ATTRIBUTE_UNUSED)977 elf_vax_discard_got_entries (struct elf_link_hash_entry *h,
978 void *infoptr ATTRIBUTE_UNUSED)
979 {
980 h->got.refcount = -1;
981 h->plt.refcount = -1;
982
983 return TRUE;
984 }
985
986 /* Discard unused dynamic data if this is a static link. */
987
988 static bfd_boolean
elf_vax_always_size_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)989 elf_vax_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
990 struct bfd_link_info *info)
991 {
992 bfd *dynobj;
993 asection *s;
994
995 dynobj = elf_hash_table (info)->dynobj;
996
997 if (dynobj && !elf_hash_table (info)->dynamic_sections_created)
998 {
999 /* We may have created entries in the .rela.got and .got sections.
1000 However, if we are not creating the dynamic sections, we will
1001 not actually use these entries. Reset the size of .rela.got
1002 and .got, which will cause them to get stripped from the output
1003 file below. */
1004 s = elf_hash_table (info)->srelgot;
1005 if (s != NULL)
1006 s->size = 0;
1007 s = elf_hash_table (info)->sgotplt;
1008 if (s != NULL)
1009 s->size = 0;
1010 s = elf_hash_table (info)->sgot;
1011 if (s != NULL)
1012 s->size = 0;
1013 }
1014
1015 /* If this is a static link, we need to discard all the got entries we've
1016 recorded. */
1017 if (!dynobj || !elf_hash_table (info)->dynamic_sections_created)
1018 elf_link_hash_traverse (elf_hash_table (info),
1019 elf_vax_discard_got_entries,
1020 info);
1021
1022 return TRUE;
1023 }
1024
1025 /* Set the sizes of the dynamic sections. */
1026
1027 static bfd_boolean
elf_vax_size_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)1028 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1029 {
1030 bfd *dynobj;
1031 asection *s;
1032 bfd_boolean relocs;
1033
1034 dynobj = elf_hash_table (info)->dynobj;
1035 BFD_ASSERT (dynobj != NULL);
1036
1037 if (elf_hash_table (info)->dynamic_sections_created)
1038 {
1039 /* Set the contents of the .interp section to the interpreter. */
1040 if (bfd_link_executable (info) && !info->nointerp)
1041 {
1042 s = bfd_get_linker_section (dynobj, ".interp");
1043 BFD_ASSERT (s != NULL);
1044 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1045 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1046 }
1047 }
1048
1049 /* If this is a -Bsymbolic shared link, then we need to discard all PC
1050 relative relocs against symbols defined in a regular object. We
1051 allocated space for them in the check_relocs routine, but we will not
1052 fill them in in the relocate_section routine. */
1053 if (bfd_link_pic (info) && info->symbolic)
1054 elf_vax_link_hash_traverse (elf_hash_table (info),
1055 elf_vax_discard_copies,
1056 NULL);
1057
1058 /* If this is a -Bsymbolic shared link, we need to discard all the got
1059 entries we've recorded. Otherwise, we need to instantiate (allocate
1060 space for them). */
1061 elf_link_hash_traverse (elf_hash_table (info),
1062 elf_vax_instantiate_got_entries,
1063 info);
1064
1065 /* The check_relocs and adjust_dynamic_symbol entry points have
1066 determined the sizes of the various dynamic sections. Allocate
1067 memory for them. */
1068 relocs = FALSE;
1069 for (s = dynobj->sections; s != NULL; s = s->next)
1070 {
1071 const char *name;
1072
1073 if ((s->flags & SEC_LINKER_CREATED) == 0)
1074 continue;
1075
1076 /* It's OK to base decisions on the section name, because none
1077 of the dynobj section names depend upon the input files. */
1078 name = bfd_section_name (s);
1079
1080 if (strcmp (name, ".plt") == 0)
1081 {
1082 /* Remember whether there is a PLT. */
1083 ;
1084 }
1085 else if (CONST_STRNEQ (name, ".rela"))
1086 {
1087 if (s->size != 0)
1088 {
1089 if (strcmp (name, ".rela.plt") != 0)
1090 relocs = TRUE;
1091
1092 /* We use the reloc_count field as a counter if we need
1093 to copy relocs into the output file. */
1094 s->reloc_count = 0;
1095 }
1096 }
1097 else if (! CONST_STRNEQ (name, ".got")
1098 && strcmp (name, ".dynbss") != 0)
1099 {
1100 /* It's not one of our sections, so don't allocate space. */
1101 continue;
1102 }
1103
1104 if (s->size == 0)
1105 {
1106 /* If we don't need this section, strip it from the
1107 output file. This is mostly to handle .rela.bss and
1108 .rela.plt. We must create both sections in
1109 create_dynamic_sections, because they must be created
1110 before the linker maps input sections to output
1111 sections. The linker does that before
1112 adjust_dynamic_symbol is called, and it is that
1113 function which decides whether anything needs to go
1114 into these sections. */
1115 s->flags |= SEC_EXCLUDE;
1116 continue;
1117 }
1118
1119 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1120 continue;
1121
1122 /* Allocate memory for the section contents. */
1123 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1124 if (s->contents == NULL)
1125 return FALSE;
1126 }
1127
1128 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs);
1129 }
1130
1131 /* This function is called via elf_vax_link_hash_traverse if we are
1132 creating a shared object with -Bsymbolic. It discards the space
1133 allocated to copy PC relative relocs against symbols which are defined
1134 in regular objects. We allocated space for them in the check_relocs
1135 routine, but we won't fill them in in the relocate_section routine. */
1136
1137 static bfd_boolean
elf_vax_discard_copies(struct elf_vax_link_hash_entry * h,void * ignore ATTRIBUTE_UNUSED)1138 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h,
1139 void * ignore ATTRIBUTE_UNUSED)
1140 {
1141 struct elf_vax_pcrel_relocs_copied *s;
1142
1143 /* We only discard relocs for symbols defined in a regular object. */
1144 if (!h->root.def_regular)
1145 return TRUE;
1146
1147 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1148 s->section->size -= s->count * sizeof (Elf32_External_Rela);
1149
1150 return TRUE;
1151 }
1152
1153 /* This function is called via elf_link_hash_traverse. It looks for
1154 entries that have GOT or PLT (.GOT) references. If creating a shared
1155 object with -Bsymbolic, or the symbol has been forced local, then it
1156 resets the reference count back to -1 so normal PC32 relocation will
1157 be done. Otherwise space in the .got and .rela.got will be reserved
1158 for the symbol. */
1159
1160 static bfd_boolean
elf_vax_instantiate_got_entries(struct elf_link_hash_entry * h,void * infoptr)1161 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, void * infoptr)
1162 {
1163 struct bfd_link_info *info = (struct bfd_link_info *) infoptr;
1164 bfd *dynobj;
1165 asection *sgot;
1166 asection *srelgot;
1167
1168 /* We don't care about non-GOT (and non-PLT) entries. */
1169 if (h->got.refcount <= 0 && h->plt.refcount <= 0)
1170 return TRUE;
1171
1172 dynobj = elf_hash_table (info)->dynobj;
1173 BFD_ASSERT (dynobj != NULL);
1174
1175 sgot = elf_hash_table (info)->sgot;
1176 srelgot = elf_hash_table (info)->srelgot;
1177
1178 if (SYMBOL_REFERENCES_LOCAL (info, h))
1179 {
1180 h->got.refcount = -1;
1181 h->plt.refcount = -1;
1182 }
1183 else if (h->got.refcount > 0)
1184 {
1185 /* Make sure this symbol is output as a dynamic symbol. */
1186 if (h->dynindx == -1)
1187 {
1188 if (!bfd_elf_link_record_dynamic_symbol (info, h))
1189 return FALSE;
1190 }
1191
1192 /* Allocate space in the .got and .rela.got sections. */
1193 sgot->size += 4;
1194 srelgot->size += sizeof (Elf32_External_Rela);
1195 }
1196
1197 return TRUE;
1198 }
1199
1200 /* Relocate an VAX ELF section. */
1201
1202 static bfd_boolean
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)1203 elf_vax_relocate_section (bfd *output_bfd,
1204 struct bfd_link_info *info,
1205 bfd *input_bfd,
1206 asection *input_section,
1207 bfd_byte *contents,
1208 Elf_Internal_Rela *relocs,
1209 Elf_Internal_Sym *local_syms,
1210 asection **local_sections)
1211 {
1212 Elf_Internal_Shdr *symtab_hdr;
1213 struct elf_link_hash_entry **sym_hashes;
1214 bfd_vma plt_index;
1215 bfd_vma got_offset;
1216 asection *sgot;
1217 asection *splt;
1218 asection *sgotplt;
1219 asection *sreloc;
1220 Elf_Internal_Rela *rel;
1221 Elf_Internal_Rela *relend;
1222
1223 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1224 sym_hashes = elf_sym_hashes (input_bfd);
1225
1226 sgot = NULL;
1227 splt = NULL;
1228 sgotplt = NULL;
1229 sreloc = NULL;
1230
1231 rel = relocs;
1232 relend = relocs + input_section->reloc_count;
1233 for (; rel < relend; rel++)
1234 {
1235 int r_type;
1236 reloc_howto_type *howto;
1237 unsigned long r_symndx;
1238 struct elf_link_hash_entry *h;
1239 Elf_Internal_Sym *sym;
1240 asection *sec;
1241 bfd_vma relocation;
1242 bfd_reloc_status_type r;
1243
1244 r_type = ELF32_R_TYPE (rel->r_info);
1245 if (r_type < 0 || r_type >= (int) R_VAX_max)
1246 {
1247 bfd_set_error (bfd_error_bad_value);
1248 return FALSE;
1249 }
1250 howto = howto_table + r_type;
1251
1252 r_symndx = ELF32_R_SYM (rel->r_info);
1253 h = NULL;
1254 sym = NULL;
1255 sec = NULL;
1256 if (r_symndx < symtab_hdr->sh_info)
1257 {
1258 sym = local_syms + r_symndx;
1259 sec = local_sections[r_symndx];
1260 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1261 }
1262 else
1263 {
1264 bfd_boolean unresolved_reloc;
1265 bfd_boolean warned, ignored;
1266
1267 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1268 r_symndx, symtab_hdr, sym_hashes,
1269 h, sec, relocation,
1270 unresolved_reloc, warned, ignored);
1271
1272 if ((h->root.type == bfd_link_hash_defined
1273 || h->root.type == bfd_link_hash_defweak)
1274 && ((r_type == R_VAX_PLT32
1275 && h->plt.offset != (bfd_vma) -1
1276 && !h->forced_local
1277 && elf_hash_table (info)->dynamic_sections_created)
1278 || (r_type == R_VAX_GOT32
1279 && h->got.offset != (bfd_vma) -1
1280 && !h->forced_local
1281 && elf_hash_table (info)->dynamic_sections_created
1282 && (! bfd_link_pic (info)
1283 || (! info->symbolic && h->dynindx != -1)
1284 || !h->def_regular))
1285 || (bfd_link_pic (info)
1286 && ((! info->symbolic && h->dynindx != -1)
1287 || !h->def_regular)
1288 && ((input_section->flags & SEC_ALLOC) != 0
1289 /* DWARF will emit R_VAX_32 relocations in its
1290 sections against symbols defined externally
1291 in shared libraries. We can't do anything
1292 with them here. */
1293
1294 || ((input_section->flags & SEC_DEBUGGING) != 0
1295 && h->def_dynamic))
1296 && (r_type == R_VAX_8
1297 || r_type == R_VAX_16
1298 || r_type == R_VAX_32))))
1299 /* In these cases, we don't need the relocation
1300 value. We check specially because in some
1301 obscure cases sec->output_section will be NULL. */
1302 relocation = 0;
1303 }
1304
1305 if (sec != NULL && discarded_section (sec))
1306 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1307 rel, 1, relend, howto, 0, contents);
1308
1309 if (bfd_link_relocatable (info))
1310 continue;
1311
1312 switch (r_type)
1313 {
1314 case R_VAX_GOT32:
1315 /* Relocation is to the address of the entry for this symbol
1316 in the global offset table. */
1317
1318 /* Resolve a GOTxx reloc against a local symbol directly,
1319 without using the global offset table. */
1320 if (h == NULL
1321 || h->got.offset == (bfd_vma) -1)
1322 break;
1323
1324 {
1325 bfd_vma off;
1326
1327 sgot = elf_hash_table (info)->sgot;
1328 BFD_ASSERT (sgot != NULL);
1329
1330 off = h->got.offset;
1331 BFD_ASSERT (off < sgot->size);
1332
1333 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off);
1334
1335 relocation = sgot->output_offset + off;
1336 /* The GOT relocation uses the addend. */
1337 rel->r_addend = 0;
1338
1339 /* Change the reference to be indirect. */
1340 contents[rel->r_offset - 1] |= 0x10;
1341 relocation += sgot->output_section->vma;
1342 }
1343 break;
1344
1345 case R_VAX_PC32:
1346 /* If we are creating an executable and the function this
1347 reloc refers to is in a shared lib, then we made a PLT
1348 entry for this symbol and need to handle the reloc like
1349 a PLT reloc. */
1350 if (bfd_link_pic (info))
1351 goto r_vax_pc32_shared;
1352 /* Fall through. */
1353 case R_VAX_PLT32:
1354 /* Relocation is to the entry for this symbol in the
1355 procedure linkage table. */
1356
1357 /* Resolve a PLTxx reloc against a local symbol directly,
1358 without using the procedure linkage table. */
1359 if (h == NULL
1360 || h->plt.offset == (bfd_vma) -1)
1361 break;
1362
1363 splt = elf_hash_table (info)->splt;
1364 BFD_ASSERT (splt != NULL);
1365
1366 sgotplt = elf_hash_table (info)->sgotplt;
1367 BFD_ASSERT (sgotplt != NULL);
1368
1369 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1370
1371 /* Get the offset into the .got table of the entry that
1372 corresponds to this function. Each .got entry is 4 bytes.
1373 The first two are reserved. */
1374 got_offset = (plt_index + 3) * 4;
1375
1376 /* We want the relocation to point into the .got.plt instead
1377 of the plt itself. */
1378 relocation = (sgotplt->output_section->vma
1379 + sgotplt->output_offset
1380 + got_offset);
1381 contents[rel->r_offset-1] |= 0x10; /* make indirect */
1382 if (rel->r_addend == 2)
1383 {
1384 h->plt.offset |= 1;
1385 }
1386 else if (rel->r_addend != 0)
1387 _bfd_error_handler
1388 /* xgettext:c-format */
1389 (_("%pB: warning: PLT addend of %" PRId64 " to `%s'"
1390 " from %pA section ignored"),
1391 input_bfd, (int64_t) rel->r_addend, h->root.root.string,
1392 input_section);
1393 rel->r_addend = 0;
1394
1395 break;
1396
1397 case R_VAX_PC8:
1398 case R_VAX_PC16:
1399 r_vax_pc32_shared:
1400 if (h == NULL
1401 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1402 || h->forced_local)
1403 break;
1404 /* Fall through. */
1405 case R_VAX_8:
1406 case R_VAX_16:
1407 case R_VAX_32:
1408 if (bfd_link_pic (info)
1409 && r_symndx != STN_UNDEF
1410 && (input_section->flags & SEC_ALLOC) != 0
1411 && ((r_type != R_VAX_PC8
1412 && r_type != R_VAX_PC16
1413 && r_type != R_VAX_PC32)
1414 || ((input_section->flags & SEC_CODE)
1415 && (!info->symbolic
1416 || (!h->def_regular && h->type != STT_SECTION)))))
1417 {
1418 Elf_Internal_Rela outrel;
1419 bfd_byte *loc;
1420 bfd_boolean skip, relocate;
1421
1422 /* When generating a shared object, these relocations
1423 are copied into the output file to be resolved at run
1424 time. */
1425 if (sreloc == NULL)
1426 {
1427 sreloc = _bfd_elf_get_dynamic_reloc_section
1428 (input_bfd, input_section, /*rela?*/ TRUE);
1429 if (sreloc == NULL)
1430 return FALSE;
1431 }
1432
1433 skip = FALSE;
1434 relocate = FALSE;
1435
1436 outrel.r_offset =
1437 _bfd_elf_section_offset (output_bfd, info, input_section,
1438 rel->r_offset);
1439 if (outrel.r_offset == (bfd_vma) -1)
1440 skip = TRUE;
1441 if (outrel.r_offset == (bfd_vma) -2)
1442 skip = TRUE, relocate = TRUE;
1443 outrel.r_offset += (input_section->output_section->vma
1444 + input_section->output_offset);
1445
1446 if (skip)
1447 memset (&outrel, 0, sizeof outrel);
1448 /* h->dynindx may be -1 if the symbol was marked to
1449 become local. */
1450 else if (h != NULL
1451 && ((! info->symbolic && h->dynindx != -1)
1452 || !h->def_regular))
1453 {
1454 BFD_ASSERT (h->dynindx != -1);
1455 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1456 outrel.r_addend = relocation + rel->r_addend;
1457 }
1458 else
1459 {
1460 if (r_type == R_VAX_32)
1461 {
1462 relocate = TRUE;
1463 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE);
1464 BFD_ASSERT (bfd_get_signed_32 (input_bfd,
1465 &contents[rel->r_offset]) == 0);
1466 outrel.r_addend = relocation + rel->r_addend;
1467 }
1468 else
1469 {
1470 long indx;
1471
1472 if (bfd_is_abs_section (sec))
1473 indx = 0;
1474 else if (sec == NULL || sec->owner == NULL)
1475 {
1476 bfd_set_error (bfd_error_bad_value);
1477 return FALSE;
1478 }
1479 else
1480 {
1481 asection *osec;
1482
1483 /* We are turning this relocation into one
1484 against a section symbol. It would be
1485 proper to subtract the symbol's value,
1486 osec->vma, from the emitted reloc addend,
1487 but ld.so expects buggy relocs. */
1488 osec = sec->output_section;
1489 indx = elf_section_data (osec)->dynindx;
1490 if (indx == 0)
1491 {
1492 struct elf_link_hash_table *htab;
1493 htab = elf_hash_table (info);
1494 osec = htab->text_index_section;
1495 indx = elf_section_data (osec)->dynindx;
1496 }
1497 BFD_ASSERT (indx != 0);
1498 }
1499
1500 outrel.r_info = ELF32_R_INFO (indx, r_type);
1501 outrel.r_addend = relocation + rel->r_addend;
1502 }
1503 }
1504
1505 if ((input_section->flags & SEC_CODE) != 0
1506 || (ELF32_R_TYPE (outrel.r_info) != R_VAX_32
1507 && ELF32_R_TYPE (outrel.r_info) != R_VAX_RELATIVE
1508 && ELF32_R_TYPE (outrel.r_info) != R_VAX_COPY
1509 && ELF32_R_TYPE (outrel.r_info) != R_VAX_JMP_SLOT
1510 && ELF32_R_TYPE (outrel.r_info) != R_VAX_GLOB_DAT))
1511 {
1512 if (h != NULL)
1513 _bfd_error_handler
1514 /* xgettext:c-format */
1515 (_("%pB: warning: %s relocation against symbol `%s'"
1516 " from %pA section"),
1517 input_bfd, howto->name, h->root.root.string,
1518 input_section);
1519 else
1520 _bfd_error_handler
1521 /* xgettext:c-format */
1522 (_("%pB: warning: %s relocation to %#" PRIx64
1523 " from %pA section"),
1524 input_bfd, howto->name, (uint64_t) outrel.r_addend,
1525 input_section);
1526 }
1527 loc = sreloc->contents;
1528 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1529 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1530
1531 /* This reloc will be computed at runtime, so there's no
1532 need to do anything now, except for R_VAX_32
1533 relocations that have been turned into
1534 R_VAX_RELATIVE. */
1535 if (!relocate)
1536 continue;
1537 }
1538
1539 break;
1540
1541 case R_VAX_GNU_VTINHERIT:
1542 case R_VAX_GNU_VTENTRY:
1543 /* These are no-ops in the end. */
1544 continue;
1545
1546 default:
1547 break;
1548 }
1549
1550 /* VAX PCREL relocations are from the end of relocation, not the start.
1551 So subtract the difference from the relocation amount since we can't
1552 add it to the offset. */
1553 if (howto->pc_relative && howto->pcrel_offset)
1554 relocation -= bfd_get_reloc_size(howto);
1555
1556 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1557 contents, rel->r_offset,
1558 relocation, rel->r_addend);
1559
1560 if (r != bfd_reloc_ok)
1561 {
1562 switch (r)
1563 {
1564 default:
1565 case bfd_reloc_outofrange:
1566 abort ();
1567 case bfd_reloc_overflow:
1568 {
1569 const char *name;
1570
1571 if (h != NULL)
1572 name = NULL;
1573 else
1574 {
1575 name = bfd_elf_string_from_elf_section (input_bfd,
1576 symtab_hdr->sh_link,
1577 sym->st_name);
1578 if (name == NULL)
1579 return FALSE;
1580 if (*name == '\0')
1581 name = bfd_section_name (sec);
1582 }
1583 info->callbacks->reloc_overflow
1584 (info, (h ? &h->root : NULL), name, howto->name,
1585 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
1586 }
1587 break;
1588 }
1589 }
1590 }
1591
1592 return TRUE;
1593 }
1594
1595 /* Finish up dynamic symbol handling. We set the contents of various
1596 dynamic sections here. */
1597
1598 static bfd_boolean
elf_vax_finish_dynamic_symbol(bfd * output_bfd,struct bfd_link_info * info,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)1599 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info,
1600 struct elf_link_hash_entry *h,
1601 Elf_Internal_Sym *sym)
1602 {
1603 bfd *dynobj;
1604
1605 dynobj = elf_hash_table (info)->dynobj;
1606
1607 if (h->plt.offset != (bfd_vma) -1)
1608 {
1609 asection *splt;
1610 asection *sgot;
1611 asection *srela;
1612 bfd_vma plt_index;
1613 bfd_vma got_offset;
1614 bfd_vma addend;
1615 Elf_Internal_Rela rela;
1616 bfd_byte *loc;
1617
1618 /* This symbol has an entry in the procedure linkage table. Set
1619 it up. */
1620 BFD_ASSERT (h->dynindx != -1);
1621
1622 splt = elf_hash_table (info)->splt;
1623 sgot = elf_hash_table (info)->sgotplt;
1624 srela = elf_hash_table (info)->srelplt;
1625 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1626
1627 addend = 2 * (h->plt.offset & 1);
1628 h->plt.offset &= ~1;
1629
1630 /* Get the index in the procedure linkage table which
1631 corresponds to this symbol. This is the index of this symbol
1632 in all the symbols for which we are making plt entries. The
1633 first entry in the procedure linkage table is reserved. */
1634 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1635
1636 /* Get the offset into the .got table of the entry that
1637 corresponds to this function. Each .got entry is 4 bytes.
1638 The first two are reserved. */
1639 got_offset = (plt_index + 3) * 4;
1640
1641 /* Fill in the entry in the procedure linkage table. */
1642 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry,
1643 PLT_ENTRY_SIZE);
1644
1645 /* The offset is relative to the first extension word. */
1646 bfd_put_32 (output_bfd,
1647 -(h->plt.offset + 8),
1648 splt->contents + h->plt.offset + 4);
1649
1650 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1651 splt->contents + h->plt.offset + 8);
1652
1653 /* Fill in the entry in the global offset table. */
1654 bfd_put_32 (output_bfd,
1655 (splt->output_section->vma
1656 + splt->output_offset
1657 + h->plt.offset) + addend,
1658 sgot->contents + got_offset);
1659
1660 /* Fill in the entry in the .rela.plt section. */
1661 rela.r_offset = (sgot->output_section->vma
1662 + sgot->output_offset
1663 + got_offset);
1664 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT);
1665 rela.r_addend = addend;
1666 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela);
1667 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1668
1669 if (!h->def_regular)
1670 {
1671 /* Mark the symbol as undefined, rather than as defined in
1672 the .plt section. Leave the value alone. */
1673 sym->st_shndx = SHN_UNDEF;
1674 }
1675 }
1676
1677 if (h->got.offset != (bfd_vma) -1)
1678 {
1679 asection *sgot;
1680 asection *srela;
1681 Elf_Internal_Rela rela;
1682 bfd_byte *loc;
1683
1684 /* This symbol has an entry in the global offset table. Set it
1685 up. */
1686 sgot = elf_hash_table (info)->sgot;
1687 srela = elf_hash_table (info)->srelgot;
1688 BFD_ASSERT (sgot != NULL && srela != NULL);
1689
1690 rela.r_offset = (sgot->output_section->vma
1691 + sgot->output_offset
1692 + h->got.offset);
1693 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT);
1694 rela.r_addend = bfd_get_signed_32 (output_bfd,
1695 sgot->contents + h->got.offset);
1696
1697 loc = srela->contents;
1698 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela);
1699 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1700 }
1701
1702 if (h->needs_copy)
1703 {
1704 asection *s;
1705 Elf_Internal_Rela rela;
1706 bfd_byte *loc;
1707
1708 /* This symbol needs a copy reloc. Set it up. */
1709 BFD_ASSERT (h->dynindx != -1
1710 && (h->root.type == bfd_link_hash_defined
1711 || h->root.type == bfd_link_hash_defweak));
1712
1713 s = bfd_get_linker_section (dynobj, ".rela.bss");
1714 BFD_ASSERT (s != NULL);
1715
1716 rela.r_offset = (h->root.u.def.value
1717 + h->root.u.def.section->output_section->vma
1718 + h->root.u.def.section->output_offset);
1719 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY);
1720 rela.r_addend = 0;
1721 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
1722 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
1723 }
1724
1725 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1726 if (h == elf_hash_table (info)->hdynamic
1727 || h == elf_hash_table (info)->hgot)
1728 sym->st_shndx = SHN_ABS;
1729
1730 return TRUE;
1731 }
1732
1733 /* Finish up the dynamic sections. */
1734
1735 static bfd_boolean
elf_vax_finish_dynamic_sections(bfd * output_bfd,struct bfd_link_info * info)1736 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
1737 {
1738 bfd *dynobj;
1739 asection *sgot;
1740 asection *sdyn;
1741
1742 dynobj = elf_hash_table (info)->dynobj;
1743
1744 sgot = elf_hash_table (info)->sgotplt;
1745 BFD_ASSERT (sgot != NULL);
1746 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
1747
1748 if (elf_hash_table (info)->dynamic_sections_created)
1749 {
1750 asection *splt;
1751 Elf32_External_Dyn *dyncon, *dynconend;
1752
1753 splt = elf_hash_table (info)->splt;
1754 BFD_ASSERT (splt != NULL && sdyn != NULL);
1755
1756 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1757 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
1758 for (; dyncon < dynconend; dyncon++)
1759 {
1760 Elf_Internal_Dyn dyn;
1761 asection *s;
1762
1763 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1764
1765 switch (dyn.d_tag)
1766 {
1767 default:
1768 break;
1769
1770 case DT_PLTGOT:
1771 s = elf_hash_table (info)->sgotplt;
1772 goto get_vma;
1773 case DT_JMPREL:
1774 s = elf_hash_table (info)->srelplt;
1775 get_vma:
1776 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
1777 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1778 break;
1779
1780 case DT_PLTRELSZ:
1781 s = elf_hash_table (info)->srelplt;
1782 dyn.d_un.d_val = s->size;
1783 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1784 break;
1785 }
1786 }
1787
1788 /* Fill in the first entry in the procedure linkage table. */
1789 if (splt->size > 0)
1790 {
1791 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE);
1792 bfd_put_32 (output_bfd,
1793 (sgot->output_section->vma
1794 + sgot->output_offset + 4
1795 - (splt->output_section->vma + 6)),
1796 splt->contents + 2);
1797 bfd_put_32 (output_bfd,
1798 (sgot->output_section->vma
1799 + sgot->output_offset + 8
1800 - (splt->output_section->vma + 12)),
1801 splt->contents + 8);
1802 elf_section_data (splt->output_section)->this_hdr.sh_entsize
1803 = PLT_ENTRY_SIZE;
1804 }
1805 }
1806
1807 /* Fill in the first three entries in the global offset table. */
1808 if (sgot->size > 0)
1809 {
1810 if (sdyn == NULL)
1811 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
1812 else
1813 bfd_put_32 (output_bfd,
1814 sdyn->output_section->vma + sdyn->output_offset,
1815 sgot->contents);
1816 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
1817 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
1818 }
1819
1820 if (elf_section_data (sgot->output_section) != NULL)
1821 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1822
1823 return TRUE;
1824 }
1825
1826 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)1827 elf_vax_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
1828 const asection *rel_sec ATTRIBUTE_UNUSED,
1829 const Elf_Internal_Rela *rela)
1830 {
1831 switch ((int) ELF32_R_TYPE (rela->r_info))
1832 {
1833 case R_VAX_RELATIVE:
1834 return reloc_class_relative;
1835 case R_VAX_JMP_SLOT:
1836 return reloc_class_plt;
1837 case R_VAX_COPY:
1838 return reloc_class_copy;
1839 default:
1840 return reloc_class_normal;
1841 }
1842 }
1843
1844 static bfd_vma
elf_vax_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)1845 elf_vax_plt_sym_val (bfd_vma i, const asection *plt,
1846 const arelent *rel ATTRIBUTE_UNUSED)
1847 {
1848 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
1849 }
1850
1851 #define TARGET_LITTLE_SYM vax_elf32_vec
1852 #define TARGET_LITTLE_NAME "elf32-vax"
1853 #define ELF_MACHINE_CODE EM_VAX
1854 #define ELF_MAXPAGESIZE 0x1000
1855
1856 #define elf_backend_create_dynamic_sections \
1857 _bfd_elf_create_dynamic_sections
1858 #define bfd_elf32_bfd_link_hash_table_create \
1859 elf_vax_link_hash_table_create
1860 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
1861
1862 #define elf_backend_check_relocs elf_vax_check_relocs
1863 #define elf_backend_adjust_dynamic_symbol \
1864 elf_vax_adjust_dynamic_symbol
1865 #define elf_backend_always_size_sections \
1866 elf_vax_always_size_sections
1867 #define elf_backend_size_dynamic_sections \
1868 elf_vax_size_dynamic_sections
1869 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
1870 #define elf_backend_relocate_section elf_vax_relocate_section
1871 #define elf_backend_finish_dynamic_symbol \
1872 elf_vax_finish_dynamic_symbol
1873 #define elf_backend_finish_dynamic_sections \
1874 elf_vax_finish_dynamic_sections
1875 #define elf_backend_reloc_type_class elf_vax_reloc_type_class
1876 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook
1877 #define elf_backend_plt_sym_val elf_vax_plt_sym_val
1878 #define bfd_elf32_bfd_merge_private_bfd_data \
1879 elf32_vax_merge_private_bfd_data
1880 #define bfd_elf32_bfd_set_private_flags \
1881 elf32_vax_set_private_flags
1882 #define bfd_elf32_bfd_print_private_bfd_data \
1883 elf32_vax_print_private_bfd_data
1884
1885 #define elf_backend_can_gc_sections 1
1886 #define elf_backend_want_got_plt 1
1887 #define elf_backend_plt_readonly 1
1888 #define elf_backend_want_plt_sym 0
1889 #define elf_backend_got_header_size 16
1890 #define elf_backend_rela_normal 1
1891 #define elf_backend_dtrel_excludes_plt 1
1892
1893 #include "elf32-target.h"
1894