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* elf32-arm.c (elf32_arm_merge_eabi_attributes): Iterate over all
[binutils.git] / bfd / elf32-d10v.c
blob293b1419de7c6baf12c95153f8b30ec3d74515f9
1 /* D10V-specific support for 32-bit ELF
2 Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
3 Free Software Foundation, Inc.
4 Contributed by Martin Hunt (hunt@cygnus.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,
21 MA 02110-1301, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/d10v.h"
28
29 /* Use REL instead of RELA to save space. */
30 #define USE_REL 1
31
32 static reloc_howto_type elf_d10v_howto_table[] =
33 {
34 /* This reloc does nothing. */
35 HOWTO (R_D10V_NONE, /* Type. */
36 0, /* Rightshift. */
37 2, /* Size (0 = byte, 1 = short, 2 = long). */
38 32, /* Bitsize. */
39 FALSE, /* PC_relative. */
40 0, /* Bitpos. */
41 complain_overflow_dont,/* Complain_on_overflow. */
42 bfd_elf_generic_reloc, /* Special_function. */
43 "R_D10V_NONE", /* Name. */
44 FALSE, /* Partial_inplace. */
45 0, /* Src_mask. */
46 0, /* Dst_mask. */
47 FALSE), /* PCrel_offset. */
48
49 /* An PC Relative 10-bit relocation, shifted by 2, right container. */
50 HOWTO (R_D10V_10_PCREL_R, /* Type. */
51 2, /* Rightshift. */
52 2, /* Size (0 = byte, 1 = short, 2 = long). */
53 8, /* Bitsize. */
54 TRUE, /* PC_relative. */
55 0, /* Bitpos. */
56 complain_overflow_signed, /* Complain_on_overflow. */
57 bfd_elf_generic_reloc, /* Special_function. */
58 "R_D10V_10_PCREL_R", /* Name. */
59 FALSE, /* Partial_inplace. */
60 0xff, /* Src_mask. */
61 0xff, /* Dst_mask. */
62 TRUE), /* PCrel_offset. */
63
64 /* An PC Relative 10-bit relocation, shifted by 2, left container. */
65 HOWTO (R_D10V_10_PCREL_L, /* Type. */
66 2, /* Rightshift. */
67 2, /* Size (0 = byte, 1 = short, 2 = long). */
68 8, /* Bitsize. */
69 TRUE, /* PC_relative. */
70 15, /* Bitpos. */
71 complain_overflow_signed, /* Complain_on_overflow. */
72 bfd_elf_generic_reloc, /* Special_function. */
73 "R_D10V_10_PCREL_L", /* Name. */
74 FALSE, /* Partial_inplace. */
75 0x07f8000, /* Src_mask. */
76 0x07f8000, /* Dst_mask. */
77 TRUE), /* PCrel_offset. */
78
79 /* A 16 bit absolute relocation. */
80 HOWTO (R_D10V_16, /* Type. */
81 0, /* Rightshift. */
82 1, /* Size (0 = byte, 1 = short, 2 = long). */
83 16, /* Bitsize. */
84 FALSE, /* PC_relative. */
85 0, /* Bitpos. */
86 complain_overflow_dont,/* Complain_on_overflow. */
87 bfd_elf_generic_reloc, /* Special_function. */
88 "R_D10V_16", /* Name. */
89 FALSE, /* Partial_inplace. */
90 0xffff, /* Src_mask. */
91 0xffff, /* Dst_mask. */
92 FALSE), /* PCrel_offset. */
93
94 /* An 18 bit absolute relocation, right shifted 2. */
95 HOWTO (R_D10V_18, /* Type. */
96 2, /* Rightshift. */
97 1, /* Size (0 = byte, 1 = short, 2 = long). */
98 16, /* Bitsize. */
99 FALSE, /* PC_relative. */
100 0, /* Bitpos. */
101 complain_overflow_dont, /* Complain_on_overflow. */
102 bfd_elf_generic_reloc, /* Special_function. */
103 "R_D10V_18", /* Name. */
104 FALSE, /* Partial_inplace. */
105 0xffff, /* Src_mask. */
106 0xffff, /* Dst_mask. */
107 FALSE), /* PCrel_offset. */
108
109 /* A relative 18 bit relocation, right shifted by 2. */
110 HOWTO (R_D10V_18_PCREL, /* Type. */
111 2, /* Rightshift. */
112 2, /* Size (0 = byte, 1 = short, 2 = long). */
113 16, /* Bitsize. */
114 TRUE, /* PC_relative. */
115 0, /* Bitpos. */
116 complain_overflow_signed, /* Complain_on_overflow. */
117 bfd_elf_generic_reloc, /* Special_function. */
118 "R_D10V_18_PCREL", /* Name. */
119 FALSE, /* Partial_inplace. */
120 0xffff, /* Src_mask. */
121 0xffff, /* Dst_mask. */
122 TRUE), /* PCrel_offset. */
123
124 /* A 32 bit absolute relocation. */
125 HOWTO (R_D10V_32, /* Type. */
126 0, /* Rightshift. */
127 2, /* Size (0 = byte, 1 = short, 2 = long). */
128 32, /* Bitsize. */
129 FALSE, /* PC_relative. */
130 0, /* Bitpos. */
131 complain_overflow_dont,/* Complain_on_overflow. */
132 bfd_elf_generic_reloc, /* Special_function. */
133 "R_D10V_32", /* Name. */
134 FALSE, /* Partial_inplace. */
135 0xffffffff, /* Src_mask. */
136 0xffffffff, /* Dst_mask. */
137 FALSE), /* PCrel_offset. */
138
139 /* GNU extension to record C++ vtable hierarchy. */
140 HOWTO (R_D10V_GNU_VTINHERIT, /* Type. */
141 0, /* Rightshift. */
142 2, /* Size (0 = byte, 1 = short, 2 = long). */
143 0, /* Bitsize. */
144 FALSE, /* PC_relative. */
145 0, /* Bitpos. */
146 complain_overflow_dont,/* Complain_on_overflow. */
147 NULL, /* Special_function. */
148 "R_D10V_GNU_VTINHERIT",/* Name. */
149 FALSE, /* Partial_inplace. */
150 0, /* Src_mask. */
151 0, /* Dst_mask. */
152 FALSE), /* PCrel_offset. */
153
154 /* GNU extension to record C++ vtable member usage. */
155 HOWTO (R_D10V_GNU_VTENTRY, /* Type. */
156 0, /* Rightshift. */
157 2, /* Size (0 = byte, 1 = short, 2 = long). */
158 0, /* Bitsize. */
159 FALSE, /* PC_relative. */
160 0, /* Bitpos. */
161 complain_overflow_dont,/* Complain_on_overflow. */
162 _bfd_elf_rel_vtable_reloc_fn, /* Special_function. */
163 "R_D10V_GNU_VTENTRY", /* Name. */
164 FALSE, /* Partial_inplace. */
165 0, /* Src_mask. */
166 0, /* Dst_mask. */
167 FALSE), /* PCrel_offset. */
168 };
169
170 /* Map BFD reloc types to D10V ELF reloc types. */
171
172 struct d10v_reloc_map
173 {
174 bfd_reloc_code_real_type bfd_reloc_val;
175 unsigned char elf_reloc_val;
176 };
177
178 static const struct d10v_reloc_map d10v_reloc_map[] =
179 {
180 { BFD_RELOC_NONE, R_D10V_NONE, },
181 { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R },
182 { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L },
183 { BFD_RELOC_16, R_D10V_16 },
184 { BFD_RELOC_D10V_18, R_D10V_18 },
185 { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL },
186 { BFD_RELOC_32, R_D10V_32 },
187 { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT },
188 { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY },
189 };
190
191 static reloc_howto_type *
192 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
193 bfd_reloc_code_real_type code)
194 {
195 unsigned int i;
196
197 for (i = 0;
198 i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map);
199 i++)
200 if (d10v_reloc_map[i].bfd_reloc_val == code)
201 return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val];
202
203 return NULL;
204 }
205
206 /* Set the howto pointer for an D10V ELF reloc. */
207
208 static void
209 d10v_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
210 arelent *cache_ptr,
211 Elf_Internal_Rela *dst)
212 {
213 unsigned int r_type;
214
215 r_type = ELF32_R_TYPE (dst->r_info);
216 BFD_ASSERT (r_type < (unsigned int) R_D10V_max);
217 cache_ptr->howto = &elf_d10v_howto_table[r_type];
218 }
219
220 static asection *
221 elf32_d10v_gc_mark_hook (asection *sec,
222 struct bfd_link_info *info ATTRIBUTE_UNUSED,
223 Elf_Internal_Rela *rel,
224 struct elf_link_hash_entry *h,
225 Elf_Internal_Sym *sym)
226 {
227 if (h != NULL)
228 {
229 switch (ELF32_R_TYPE (rel->r_info))
230 {
231 case R_D10V_GNU_VTINHERIT:
232 case R_D10V_GNU_VTENTRY:
233 break;
234
235 default:
236 switch (h->root.type)
237 {
238 case bfd_link_hash_defined:
239 case bfd_link_hash_defweak:
240 return h->root.u.def.section;
241
242 case bfd_link_hash_common:
243 return h->root.u.c.p->section;
244
245 default:
246 break;
247 }
248 }
249 }
250 else
251 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
252
253 return NULL;
254 }
255
256 static bfd_boolean
257 elf32_d10v_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED,
258 struct bfd_link_info *info ATTRIBUTE_UNUSED,
259 asection *sec ATTRIBUTE_UNUSED,
260 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED)
261 {
262 /* We don't use got and plt entries for d10v. */
263 return TRUE;
264 }
265
266 /* Look through the relocs for a section during the first phase.
267 Since we don't do .gots or .plts, we just need to consider the
268 virtual table relocs for gc. */
269
270 static bfd_boolean
271 elf32_d10v_check_relocs (bfd *abfd,
272 struct bfd_link_info *info,
273 asection *sec,
274 const Elf_Internal_Rela *relocs)
275 {
276 Elf_Internal_Shdr *symtab_hdr;
277 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
278 const Elf_Internal_Rela *rel;
279 const Elf_Internal_Rela *rel_end;
280
281 if (info->relocatable)
282 return TRUE;
283
284 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
285 sym_hashes = elf_sym_hashes (abfd);
286 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
287 if (!elf_bad_symtab (abfd))
288 sym_hashes_end -= symtab_hdr->sh_info;
289
290 rel_end = relocs + sec->reloc_count;
291 for (rel = relocs; rel < rel_end; rel++)
292 {
293 struct elf_link_hash_entry *h;
294 unsigned long r_symndx;
295
296 r_symndx = ELF32_R_SYM (rel->r_info);
297 if (r_symndx < symtab_hdr->sh_info)
298 h = NULL;
299 else
300 {
301 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
302 while (h->root.type == bfd_link_hash_indirect
303 || h->root.type == bfd_link_hash_warning)
304 h = (struct elf_link_hash_entry *) h->root.u.i.link;
305 }
306
307 switch (ELF32_R_TYPE (rel->r_info))
308 {
309 /* This relocation describes the C++ object vtable hierarchy.
310 Reconstruct it for later use during GC. */
311 case R_D10V_GNU_VTINHERIT:
312 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
313 return FALSE;
314 break;
315
316 /* This relocation describes which C++ vtable entries are actually
317 used. Record for later use during GC. */
318 case R_D10V_GNU_VTENTRY:
319 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
320 return FALSE;
321 break;
322 }
323 }
324
325 return TRUE;
326 }
327
328 static bfd_vma
329 extract_rel_addend (bfd *abfd,
330 bfd_byte *where,
331 reloc_howto_type *howto)
332 {
333 bfd_vma insn, val;
334
335 switch (howto->size)
336 {
337 case 0:
338 insn = bfd_get_8 (abfd, where);
339 break;
340 case 1:
341 insn = bfd_get_16 (abfd, where);
342 break;
343 case 2:
344 insn = bfd_get_32 (abfd, where);
345 break;
346 default:
347 abort ();
348 }
349
350 val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift;
351 /* We should really be testing for signed addends here, but we don't
352 have that info directly in the howto. */
353 if (howto->pc_relative)
354 {
355 bfd_vma sign;
356 sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1));
357 sign = sign >> howto->bitpos << howto->rightshift;
358 val = (val ^ sign) - sign;
359 }
360 return val;
361 }
362
363 static void
364 insert_rel_addend (bfd *abfd,
365 bfd_byte *where,
366 reloc_howto_type *howto,
367 bfd_vma addend)
368 {
369 bfd_vma insn;
370
371 addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask;
372 insn = ~howto->dst_mask;
373 switch (howto->size)
374 {
375 case 0:
376 insn &= bfd_get_8 (abfd, where);
377 insn |= addend;
378 bfd_put_8 (abfd, insn, where);
379 break;
380 case 1:
381 insn &= bfd_get_16 (abfd, where);
382 insn |= addend;
383 bfd_put_16 (abfd, insn, where);
384 break;
385 case 2:
386 insn &= bfd_get_32 (abfd, where);
387 insn |= addend;
388 bfd_put_32 (abfd, insn, where);
389 break;
390 default:
391 abort ();
392 }
393 }
394
395 /* Relocate a D10V ELF section. */
396
397 static bfd_boolean
398 elf32_d10v_relocate_section (bfd *output_bfd,
399 struct bfd_link_info *info,
400 bfd *input_bfd,
401 asection *input_section,
402 bfd_byte *contents,
403 Elf_Internal_Rela *relocs,
404 Elf_Internal_Sym *local_syms,
405 asection **local_sections)
406 {
407 Elf_Internal_Shdr *symtab_hdr;
408 struct elf_link_hash_entry **sym_hashes;
409 Elf_Internal_Rela *rel, *relend;
410 const char *name;
411
412 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
413 sym_hashes = elf_sym_hashes (input_bfd);
414
415 rel = relocs;
416 relend = relocs + input_section->reloc_count;
417 for (; rel < relend; rel++)
418 {
419 int r_type;
420 reloc_howto_type *howto;
421 unsigned long r_symndx;
422 Elf_Internal_Sym *sym;
423 asection *sec;
424 struct elf_link_hash_entry *h;
425 bfd_vma relocation;
426 bfd_reloc_status_type r;
427
428 r_symndx = ELF32_R_SYM (rel->r_info);
429 r_type = ELF32_R_TYPE (rel->r_info);
430
431 if (r_type == R_D10V_GNU_VTENTRY
432 || r_type == R_D10V_GNU_VTINHERIT)
433 continue;
434
435 howto = elf_d10v_howto_table + r_type;
436
437 if (info->relocatable)
438 {
439 bfd_vma val;
440 bfd_byte *where;
441
442 /* This is a relocatable link. We don't have to change
443 anything, unless the reloc is against a section symbol,
444 in which case we have to adjust according to where the
445 section symbol winds up in the output section. */
446 if (r_symndx >= symtab_hdr->sh_info)
447 continue;
448
449 sym = local_syms + r_symndx;
450 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
451 continue;
452
453 sec = local_sections[r_symndx];
454 val = sec->output_offset;
455 if (val == 0)
456 continue;
457
458 where = contents + rel->r_offset;
459 val += extract_rel_addend (input_bfd, where, howto);
460 insert_rel_addend (input_bfd, where, howto, val);
461 continue;
462 }
463
464 /* This is a final link. */
465 h = NULL;
466 sym = NULL;
467 sec = NULL;
468 if (r_symndx < symtab_hdr->sh_info)
469 {
470 sym = local_syms + r_symndx;
471 sec = local_sections[r_symndx];
472 relocation = (sec->output_section->vma
473 + sec->output_offset
474 + sym->st_value);
475 if ((sec->flags & SEC_MERGE)
476 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
477 {
478 asection *msec;
479 bfd_vma addend;
480 bfd_byte *where = contents + rel->r_offset;
481
482 addend = extract_rel_addend (input_bfd, where, howto);
483 msec = sec;
484 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
485 addend -= relocation;
486 addend += msec->output_section->vma + msec->output_offset;
487 insert_rel_addend (input_bfd, where, howto, addend);
488 }
489 }
490 else
491 {
492 bfd_boolean unresolved_reloc, warned;
493
494 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
495 r_symndx, symtab_hdr, sym_hashes,
496 h, sec, relocation,
497 unresolved_reloc, warned);
498 }
499
500 if (h != NULL)
501 name = h->root.root.string;
502 else
503 {
504 name = (bfd_elf_string_from_elf_section
505 (input_bfd, symtab_hdr->sh_link, sym->st_name));
506 if (name == NULL || *name == '\0')
507 name = bfd_section_name (input_bfd, sec);
508 }
509
510 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
511 contents, rel->r_offset,
512 relocation, (bfd_vma) 0);
513
514 if (r != bfd_reloc_ok)
515 {
516 const char * msg = (const char *) 0;
517
518 switch (r)
519 {
520 case bfd_reloc_overflow:
521 if (!((*info->callbacks->reloc_overflow)
522 (info, (h ? &h->root : NULL), name, howto->name,
523 (bfd_vma) 0, input_bfd, input_section,
524 rel->r_offset)))
525 return FALSE;
526 break;
527
528 case bfd_reloc_undefined:
529 if (!((*info->callbacks->undefined_symbol)
530 (info, name, input_bfd, input_section,
531 rel->r_offset, TRUE)))
532 return FALSE;
533 break;
534
535 case bfd_reloc_outofrange:
536 msg = _("internal error: out of range error");
537 goto common_error;
538
539 case bfd_reloc_notsupported:
540 msg = _("internal error: unsupported relocation error");
541 goto common_error;
542
543 case bfd_reloc_dangerous:
544 msg = _("internal error: dangerous error");
545 goto common_error;
546
547 default:
548 msg = _("internal error: unknown error");
549 /* fall through */
550
551 common_error:
552 if (!((*info->callbacks->warning)
553 (info, msg, name, input_bfd, input_section,
554 rel->r_offset)))
555 return FALSE;
556 break;
557 }
558 }
559 }
560
561 return TRUE;
562 }
563 #define ELF_ARCH bfd_arch_d10v
564 #define ELF_MACHINE_CODE EM_D10V
565 #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V
566 #define ELF_MAXPAGESIZE 0x1000
567
568 #define TARGET_BIG_SYM bfd_elf32_d10v_vec
569 #define TARGET_BIG_NAME "elf32-d10v"
570
571 #define elf_info_to_howto 0
572 #define elf_info_to_howto_rel d10v_info_to_howto_rel
573 #define elf_backend_object_p 0
574 #define elf_backend_final_write_processing 0
575 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
576 #define elf_backend_gc_sweep_hook elf32_d10v_gc_sweep_hook
577 #define elf_backend_check_relocs elf32_d10v_check_relocs
578 #define elf_backend_relocate_section elf32_d10v_relocate_section
579 #define elf_backend_can_gc_sections 1
580
581 #include "elf32-target.h"
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