1 /* D10V-specific support for 32-bit ELF
2 Copyright (C) 1996-2014 Free Software Foundation, Inc.
3 Contributed by Martin Hunt (hunt@cygnus.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 "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/d10v.h"
27
28 /* Use REL instead of RELA to save space. */
29 #define USE_REL 1
30
31 static reloc_howto_type elf_d10v_howto_table[] =
32 {
33 /* This reloc does nothing. */
34 HOWTO (R_D10V_NONE, /* Type. */
35 0, /* Rightshift. */
36 2, /* Size (0 = byte, 1 = short, 2 = long). */
37 32, /* Bitsize. */
38 FALSE, /* PC_relative. */
39 0, /* Bitpos. */
40 complain_overflow_dont,/* Complain_on_overflow. */
41 bfd_elf_generic_reloc, /* Special_function. */
42 "R_D10V_NONE", /* Name. */
43 FALSE, /* Partial_inplace. */
44 0, /* Src_mask. */
45 0, /* Dst_mask. */
46 FALSE), /* PCrel_offset. */
47
48 /* An PC Relative 10-bit relocation, shifted by 2, right container. */
49 HOWTO (R_D10V_10_PCREL_R, /* Type. */
50 2, /* Rightshift. */
51 2, /* Size (0 = byte, 1 = short, 2 = long). */
52 8, /* Bitsize. */
53 TRUE, /* PC_relative. */
54 0, /* Bitpos. */
55 complain_overflow_signed, /* Complain_on_overflow. */
56 bfd_elf_generic_reloc, /* Special_function. */
57 "R_D10V_10_PCREL_R", /* Name. */
58 FALSE, /* Partial_inplace. */
59 0xff, /* Src_mask. */
60 0xff, /* Dst_mask. */
61 TRUE), /* PCrel_offset. */
62
63 /* An PC Relative 10-bit relocation, shifted by 2, left container. */
64 HOWTO (R_D10V_10_PCREL_L, /* Type. */
65 2, /* Rightshift. */
66 2, /* Size (0 = byte, 1 = short, 2 = long). */
67 8, /* Bitsize. */
68 TRUE, /* PC_relative. */
69 15, /* Bitpos. */
70 complain_overflow_signed, /* Complain_on_overflow. */
71 bfd_elf_generic_reloc, /* Special_function. */
72 "R_D10V_10_PCREL_L", /* Name. */
73 FALSE, /* Partial_inplace. */
74 0x07f8000, /* Src_mask. */
75 0x07f8000, /* Dst_mask. */
76 TRUE), /* PCrel_offset. */
77
78 /* A 16 bit absolute relocation. */
79 HOWTO (R_D10V_16, /* Type. */
80 0, /* Rightshift. */
81 1, /* Size (0 = byte, 1 = short, 2 = long). */
82 16, /* Bitsize. */
83 FALSE, /* PC_relative. */
84 0, /* Bitpos. */
85 complain_overflow_dont,/* Complain_on_overflow. */
86 bfd_elf_generic_reloc, /* Special_function. */
87 "R_D10V_16", /* Name. */
88 FALSE, /* Partial_inplace. */
89 0xffff, /* Src_mask. */
90 0xffff, /* Dst_mask. */
91 FALSE), /* PCrel_offset. */
92
93 /* An 18 bit absolute relocation, right shifted 2. */
94 HOWTO (R_D10V_18, /* Type. */
95 2, /* Rightshift. */
96 1, /* Size (0 = byte, 1 = short, 2 = long). */
97 16, /* Bitsize. */
98 FALSE, /* PC_relative. */
99 0, /* Bitpos. */
100 complain_overflow_dont, /* Complain_on_overflow. */
101 bfd_elf_generic_reloc, /* Special_function. */
102 "R_D10V_18", /* Name. */
103 FALSE, /* Partial_inplace. */
104 0xffff, /* Src_mask. */
105 0xffff, /* Dst_mask. */
106 FALSE), /* PCrel_offset. */
107
108 /* A relative 18 bit relocation, right shifted by 2. */
109 HOWTO (R_D10V_18_PCREL, /* Type. */
110 2, /* Rightshift. */
111 2, /* Size (0 = byte, 1 = short, 2 = long). */
112 16, /* Bitsize. */
113 TRUE, /* PC_relative. */
114 0, /* Bitpos. */
115 complain_overflow_signed, /* Complain_on_overflow. */
116 bfd_elf_generic_reloc, /* Special_function. */
117 "R_D10V_18_PCREL", /* Name. */
118 FALSE, /* Partial_inplace. */
119 0xffff, /* Src_mask. */
120 0xffff, /* Dst_mask. */
121 TRUE), /* PCrel_offset. */
122
123 /* A 32 bit absolute relocation. */
124 HOWTO (R_D10V_32, /* Type. */
125 0, /* Rightshift. */
126 2, /* Size (0 = byte, 1 = short, 2 = long). */
127 32, /* Bitsize. */
128 FALSE, /* PC_relative. */
129 0, /* Bitpos. */
130 complain_overflow_dont,/* Complain_on_overflow. */
131 bfd_elf_generic_reloc, /* Special_function. */
132 "R_D10V_32", /* Name. */
133 FALSE, /* Partial_inplace. */
134 0xffffffff, /* Src_mask. */
135 0xffffffff, /* Dst_mask. */
136 FALSE), /* PCrel_offset. */
137
138 /* GNU extension to record C++ vtable hierarchy. */
139 HOWTO (R_D10V_GNU_VTINHERIT, /* Type. */
140 0, /* Rightshift. */
141 2, /* Size (0 = byte, 1 = short, 2 = long). */
142 0, /* Bitsize. */
143 FALSE, /* PC_relative. */
144 0, /* Bitpos. */
145 complain_overflow_dont,/* Complain_on_overflow. */
146 NULL, /* Special_function. */
147 "R_D10V_GNU_VTINHERIT",/* Name. */
148 FALSE, /* Partial_inplace. */
149 0, /* Src_mask. */
150 0, /* Dst_mask. */
151 FALSE), /* PCrel_offset. */
152
153 /* GNU extension to record C++ vtable member usage. */
154 HOWTO (R_D10V_GNU_VTENTRY, /* Type. */
155 0, /* Rightshift. */
156 2, /* Size (0 = byte, 1 = short, 2 = long). */
157 0, /* Bitsize. */
158 FALSE, /* PC_relative. */
159 0, /* Bitpos. */
160 complain_overflow_dont,/* Complain_on_overflow. */
161 _bfd_elf_rel_vtable_reloc_fn, /* Special_function. */
162 "R_D10V_GNU_VTENTRY", /* Name. */
163 FALSE, /* Partial_inplace. */
164 0, /* Src_mask. */
165 0, /* Dst_mask. */
166 FALSE), /* PCrel_offset. */
167 };
168
169 /* Map BFD reloc types to D10V ELF reloc types. */
170
171 struct d10v_reloc_map
172 {
173 bfd_reloc_code_real_type bfd_reloc_val;
174 unsigned char elf_reloc_val;
175 };
176
177 static const struct d10v_reloc_map d10v_reloc_map[] =
178 {
179 { BFD_RELOC_NONE, R_D10V_NONE, },
180 { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R },
181 { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L },
182 { BFD_RELOC_16, R_D10V_16 },
183 { BFD_RELOC_D10V_18, R_D10V_18 },
184 { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL },
185 { BFD_RELOC_32, R_D10V_32 },
186 { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT },
187 { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY },
188 };
189
190 static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)191 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
192 bfd_reloc_code_real_type code)
193 {
194 unsigned int i;
195
196 for (i = 0;
197 i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map);
198 i++)
199 if (d10v_reloc_map[i].bfd_reloc_val == code)
200 return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val];
201
202 return NULL;
203 }
204
205 static reloc_howto_type *
bfd_elf32_bfd_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)206 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
207 const char *r_name)
208 {
209 unsigned int i;
210
211 for (i = 0;
212 i < sizeof (elf_d10v_howto_table) / sizeof (elf_d10v_howto_table[0]);
213 i++)
214 if (elf_d10v_howto_table[i].name != NULL
215 && strcasecmp (elf_d10v_howto_table[i].name, r_name) == 0)
216 return &elf_d10v_howto_table[i];
217
218 return NULL;
219 }
220
221 /* Set the howto pointer for an D10V ELF reloc. */
222
223 static void
d10v_info_to_howto_rel(bfd * abfd ATTRIBUTE_UNUSED,arelent * cache_ptr,Elf_Internal_Rela * dst)224 d10v_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
225 arelent *cache_ptr,
226 Elf_Internal_Rela *dst)
227 {
228 unsigned int r_type;
229
230 r_type = ELF32_R_TYPE (dst->r_info);
231 BFD_ASSERT (r_type < (unsigned int) R_D10V_max);
232 cache_ptr->howto = &elf_d10v_howto_table[r_type];
233 }
234
235 static asection *
elf32_d10v_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)236 elf32_d10v_gc_mark_hook (asection *sec,
237 struct bfd_link_info *info,
238 Elf_Internal_Rela *rel,
239 struct elf_link_hash_entry *h,
240 Elf_Internal_Sym *sym)
241 {
242 if (h != NULL)
243 switch (ELF32_R_TYPE (rel->r_info))
244 {
245 case R_D10V_GNU_VTINHERIT:
246 case R_D10V_GNU_VTENTRY:
247 return NULL;
248 }
249
250 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
251 }
252
253 /* Look through the relocs for a section during the first phase.
254 Since we don't do .gots or .plts, we just need to consider the
255 virtual table relocs for gc. */
256
257 static bfd_boolean
elf32_d10v_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)258 elf32_d10v_check_relocs (bfd *abfd,
259 struct bfd_link_info *info,
260 asection *sec,
261 const Elf_Internal_Rela *relocs)
262 {
263 Elf_Internal_Shdr *symtab_hdr;
264 struct elf_link_hash_entry **sym_hashes;
265 const Elf_Internal_Rela *rel;
266 const Elf_Internal_Rela *rel_end;
267
268 if (info->relocatable)
269 return TRUE;
270
271 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
272 sym_hashes = elf_sym_hashes (abfd);
273
274 rel_end = relocs + sec->reloc_count;
275 for (rel = relocs; rel < rel_end; rel++)
276 {
277 struct elf_link_hash_entry *h;
278 unsigned long r_symndx;
279
280 r_symndx = ELF32_R_SYM (rel->r_info);
281 if (r_symndx < symtab_hdr->sh_info)
282 h = NULL;
283 else
284 {
285 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
286 while (h->root.type == bfd_link_hash_indirect
287 || h->root.type == bfd_link_hash_warning)
288 h = (struct elf_link_hash_entry *) h->root.u.i.link;
289
290 /* PR15323, ref flags aren't set for references in the same
291 object. */
292 h->root.non_ir_ref = 1;
293 }
294
295 switch (ELF32_R_TYPE (rel->r_info))
296 {
297 /* This relocation describes the C++ object vtable hierarchy.
298 Reconstruct it for later use during GC. */
299 case R_D10V_GNU_VTINHERIT:
300 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
301 return FALSE;
302 break;
303
304 /* This relocation describes which C++ vtable entries are actually
305 used. Record for later use during GC. */
306 case R_D10V_GNU_VTENTRY:
307 BFD_ASSERT (h != NULL);
308 if (h != NULL
309 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
310 return FALSE;
311 break;
312 }
313 }
314
315 return TRUE;
316 }
317
318 static bfd_vma
extract_rel_addend(bfd * abfd,bfd_byte * where,reloc_howto_type * howto)319 extract_rel_addend (bfd *abfd,
320 bfd_byte *where,
321 reloc_howto_type *howto)
322 {
323 bfd_vma insn, val;
324
325 switch (howto->size)
326 {
327 case 0:
328 insn = bfd_get_8 (abfd, where);
329 break;
330 case 1:
331 insn = bfd_get_16 (abfd, where);
332 break;
333 case 2:
334 insn = bfd_get_32 (abfd, where);
335 break;
336 default:
337 abort ();
338 }
339
340 val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift;
341 /* We should really be testing for signed addends here, but we don't
342 have that info directly in the howto. */
343 if (howto->pc_relative)
344 {
345 bfd_vma sign;
346 sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1));
347 sign = sign >> howto->bitpos << howto->rightshift;
348 val = (val ^ sign) - sign;
349 }
350 return val;
351 }
352
353 static void
insert_rel_addend(bfd * abfd,bfd_byte * where,reloc_howto_type * howto,bfd_vma addend)354 insert_rel_addend (bfd *abfd,
355 bfd_byte *where,
356 reloc_howto_type *howto,
357 bfd_vma addend)
358 {
359 bfd_vma insn;
360
361 addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask;
362 insn = ~howto->dst_mask;
363 switch (howto->size)
364 {
365 case 0:
366 insn &= bfd_get_8 (abfd, where);
367 insn |= addend;
368 bfd_put_8 (abfd, insn, where);
369 break;
370 case 1:
371 insn &= bfd_get_16 (abfd, where);
372 insn |= addend;
373 bfd_put_16 (abfd, insn, where);
374 break;
375 case 2:
376 insn &= bfd_get_32 (abfd, where);
377 insn |= addend;
378 bfd_put_32 (abfd, insn, where);
379 break;
380 default:
381 abort ();
382 }
383 }
384
385 /* Relocate a D10V ELF section. */
386
387 static bfd_boolean
elf32_d10v_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)388 elf32_d10v_relocate_section (bfd *output_bfd,
389 struct bfd_link_info *info,
390 bfd *input_bfd,
391 asection *input_section,
392 bfd_byte *contents,
393 Elf_Internal_Rela *relocs,
394 Elf_Internal_Sym *local_syms,
395 asection **local_sections)
396 {
397 Elf_Internal_Shdr *symtab_hdr;
398 struct elf_link_hash_entry **sym_hashes;
399 Elf_Internal_Rela *rel, *relend;
400 const char *name;
401
402 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
403 sym_hashes = elf_sym_hashes (input_bfd);
404
405 rel = relocs;
406 relend = relocs + input_section->reloc_count;
407 for (; rel < relend; rel++)
408 {
409 int r_type;
410 reloc_howto_type *howto;
411 unsigned long r_symndx;
412 Elf_Internal_Sym *sym;
413 asection *sec;
414 struct elf_link_hash_entry *h;
415 bfd_vma relocation;
416 bfd_reloc_status_type r;
417
418 r_symndx = ELF32_R_SYM (rel->r_info);
419 r_type = ELF32_R_TYPE (rel->r_info);
420
421 if (r_type == R_D10V_GNU_VTENTRY
422 || r_type == R_D10V_GNU_VTINHERIT)
423 continue;
424
425 howto = elf_d10v_howto_table + r_type;
426 h = NULL;
427 sym = NULL;
428 sec = NULL;
429 if (r_symndx < symtab_hdr->sh_info)
430 {
431 sym = local_syms + r_symndx;
432 sec = local_sections[r_symndx];
433 relocation = (sec->output_section->vma
434 + sec->output_offset
435 + sym->st_value);
436 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
437 && ((sec->flags & SEC_MERGE) != 0
438 || (info->relocatable
439 && sec->output_offset != 0)))
440 {
441 bfd_vma addend;
442 bfd_byte *where = contents + rel->r_offset;
443
444 addend = extract_rel_addend (input_bfd, where, howto);
445
446 if (info->relocatable)
447 addend += sec->output_offset;
448 else
449 {
450 asection *msec = sec;
451 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
452 addend);
453 addend -= relocation;
454 addend += msec->output_section->vma + msec->output_offset;
455 }
456 insert_rel_addend (input_bfd, where, howto, addend);
457 }
458 }
459 else
460 {
461 bfd_boolean unresolved_reloc, warned, ignored;
462
463 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
464 r_symndx, symtab_hdr, sym_hashes,
465 h, sec, relocation,
466 unresolved_reloc, warned, ignored);
467 }
468
469 if (sec != NULL && discarded_section (sec))
470 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
471 rel, 1, relend, howto, 0, contents);
472
473 if (info->relocatable)
474 continue;
475
476 if (h != NULL)
477 name = h->root.root.string;
478 else
479 {
480 name = (bfd_elf_string_from_elf_section
481 (input_bfd, symtab_hdr->sh_link, sym->st_name));
482 if (name == NULL || *name == '\0')
483 name = bfd_section_name (input_bfd, sec);
484 }
485
486 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
487 contents, rel->r_offset,
488 relocation, (bfd_vma) 0);
489
490 if (r != bfd_reloc_ok)
491 {
492 const char * msg = (const char *) 0;
493
494 switch (r)
495 {
496 case bfd_reloc_overflow:
497 if (!((*info->callbacks->reloc_overflow)
498 (info, (h ? &h->root : NULL), name, howto->name,
499 (bfd_vma) 0, input_bfd, input_section,
500 rel->r_offset)))
501 return FALSE;
502 break;
503
504 case bfd_reloc_undefined:
505 if (!((*info->callbacks->undefined_symbol)
506 (info, name, input_bfd, input_section,
507 rel->r_offset, TRUE)))
508 return FALSE;
509 break;
510
511 case bfd_reloc_outofrange:
512 msg = _("internal error: out of range error");
513 goto common_error;
514
515 case bfd_reloc_notsupported:
516 msg = _("internal error: unsupported relocation error");
517 goto common_error;
518
519 case bfd_reloc_dangerous:
520 msg = _("internal error: dangerous error");
521 goto common_error;
522
523 default:
524 msg = _("internal error: unknown error");
525 /* fall through */
526
527 common_error:
528 if (!((*info->callbacks->warning)
529 (info, msg, name, input_bfd, input_section,
530 rel->r_offset)))
531 return FALSE;
532 break;
533 }
534 }
535 }
536
537 return TRUE;
538 }
539 #define ELF_ARCH bfd_arch_d10v
540 #define ELF_MACHINE_CODE EM_D10V
541 #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V
542 #define ELF_MAXPAGESIZE 0x1000
543
544 #define TARGET_BIG_SYM d10v_elf32_vec
545 #define TARGET_BIG_NAME "elf32-d10v"
546
547 #define elf_info_to_howto 0
548 #define elf_info_to_howto_rel d10v_info_to_howto_rel
549 #define elf_backend_object_p 0
550 #define elf_backend_final_write_processing 0
551 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
552 #define elf_backend_check_relocs elf32_d10v_check_relocs
553 #define elf_backend_relocate_section elf32_d10v_relocate_section
554 #define elf_backend_can_gc_sections 1
555
556 #include "elf32-target.h"
557