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[gdb/gnu.git] / bfd / elf32-d10v.c
blobf75c16ae7eca9d2a403740997e76e21003642082
1 /* D10V-specific support for 32-bit ELF
2 Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
3 2007, 2010, 2012 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 3 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 "sysdep.h"
24 #include "bfd.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 static reloc_howto_type *
207 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
208 const char *r_name)
209 {
210 unsigned int i;
211
212 for (i = 0;
213 i < sizeof (elf_d10v_howto_table) / sizeof (elf_d10v_howto_table[0]);
214 i++)
215 if (elf_d10v_howto_table[i].name != NULL
216 && strcasecmp (elf_d10v_howto_table[i].name, r_name) == 0)
217 return &elf_d10v_howto_table[i];
218
219 return NULL;
220 }
221
222 /* Set the howto pointer for an D10V ELF reloc. */
223
224 static void
225 d10v_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
226 arelent *cache_ptr,
227 Elf_Internal_Rela *dst)
228 {
229 unsigned int r_type;
230
231 r_type = ELF32_R_TYPE (dst->r_info);
232 BFD_ASSERT (r_type < (unsigned int) R_D10V_max);
233 cache_ptr->howto = &elf_d10v_howto_table[r_type];
234 }
235
236 static asection *
237 elf32_d10v_gc_mark_hook (asection *sec,
238 struct bfd_link_info *info,
239 Elf_Internal_Rela *rel,
240 struct elf_link_hash_entry *h,
241 Elf_Internal_Sym *sym)
242 {
243 if (h != NULL)
244 switch (ELF32_R_TYPE (rel->r_info))
245 {
246 case R_D10V_GNU_VTINHERIT:
247 case R_D10V_GNU_VTENTRY:
248 return NULL;
249 }
250
251 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
252 }
253
254 /* Look through the relocs for a section during the first phase.
255 Since we don't do .gots or .plts, we just need to consider the
256 virtual table relocs for gc. */
257
258 static bfd_boolean
259 elf32_d10v_check_relocs (bfd *abfd,
260 struct bfd_link_info *info,
261 asection *sec,
262 const Elf_Internal_Rela *relocs)
263 {
264 Elf_Internal_Shdr *symtab_hdr;
265 struct elf_link_hash_entry **sym_hashes;
266 const Elf_Internal_Rela *rel;
267 const Elf_Internal_Rela *rel_end;
268
269 if (info->relocatable)
270 return TRUE;
271
272 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
273 sym_hashes = elf_sym_hashes (abfd);
274
275 rel_end = relocs + sec->reloc_count;
276 for (rel = relocs; rel < rel_end; rel++)
277 {
278 struct elf_link_hash_entry *h;
279 unsigned long r_symndx;
280
281 r_symndx = ELF32_R_SYM (rel->r_info);
282 if (r_symndx < symtab_hdr->sh_info)
283 h = NULL;
284 else
285 {
286 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
287 while (h->root.type == bfd_link_hash_indirect
288 || h->root.type == bfd_link_hash_warning)
289 h = (struct elf_link_hash_entry *) h->root.u.i.link;
290
291 /* PR15323, ref flags aren't set for references in the same
292 object. */
293 h->root.non_ir_ref = 1;
294 }
295
296 switch (ELF32_R_TYPE (rel->r_info))
297 {
298 /* This relocation describes the C++ object vtable hierarchy.
299 Reconstruct it for later use during GC. */
300 case R_D10V_GNU_VTINHERIT:
301 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
302 return FALSE;
303 break;
304
305 /* This relocation describes which C++ vtable entries are actually
306 used. Record for later use during GC. */
307 case R_D10V_GNU_VTENTRY:
308 BFD_ASSERT (h != NULL);
309 if (h != NULL
310 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
311 return FALSE;
312 break;
313 }
314 }
315
316 return TRUE;
317 }
318
319 static bfd_vma
320 extract_rel_addend (bfd *abfd,
321 bfd_byte *where,
322 reloc_howto_type *howto)
323 {
324 bfd_vma insn, val;
325
326 switch (howto->size)
327 {
328 case 0:
329 insn = bfd_get_8 (abfd, where);
330 break;
331 case 1:
332 insn = bfd_get_16 (abfd, where);
333 break;
334 case 2:
335 insn = bfd_get_32 (abfd, where);
336 break;
337 default:
338 abort ();
339 }
340
341 val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift;
342 /* We should really be testing for signed addends here, but we don't
343 have that info directly in the howto. */
344 if (howto->pc_relative)
345 {
346 bfd_vma sign;
347 sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1));
348 sign = sign >> howto->bitpos << howto->rightshift;
349 val = (val ^ sign) - sign;
350 }
351 return val;
352 }
353
354 static void
355 insert_rel_addend (bfd *abfd,
356 bfd_byte *where,
357 reloc_howto_type *howto,
358 bfd_vma addend)
359 {
360 bfd_vma insn;
361
362 addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask;
363 insn = ~howto->dst_mask;
364 switch (howto->size)
365 {
366 case 0:
367 insn &= bfd_get_8 (abfd, where);
368 insn |= addend;
369 bfd_put_8 (abfd, insn, where);
370 break;
371 case 1:
372 insn &= bfd_get_16 (abfd, where);
373 insn |= addend;
374 bfd_put_16 (abfd, insn, where);
375 break;
376 case 2:
377 insn &= bfd_get_32 (abfd, where);
378 insn |= addend;
379 bfd_put_32 (abfd, insn, where);
380 break;
381 default:
382 abort ();
383 }
384 }
385
386 /* Relocate a D10V ELF section. */
387
388 static bfd_boolean
389 elf32_d10v_relocate_section (bfd *output_bfd,
390 struct bfd_link_info *info,
391 bfd *input_bfd,
392 asection *input_section,
393 bfd_byte *contents,
394 Elf_Internal_Rela *relocs,
395 Elf_Internal_Sym *local_syms,
396 asection **local_sections)
397 {
398 Elf_Internal_Shdr *symtab_hdr;
399 struct elf_link_hash_entry **sym_hashes;
400 Elf_Internal_Rela *rel, *relend;
401 const char *name;
402
403 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
404 sym_hashes = elf_sym_hashes (input_bfd);
405
406 rel = relocs;
407 relend = relocs + input_section->reloc_count;
408 for (; rel < relend; rel++)
409 {
410 int r_type;
411 reloc_howto_type *howto;
412 unsigned long r_symndx;
413 Elf_Internal_Sym *sym;
414 asection *sec;
415 struct elf_link_hash_entry *h;
416 bfd_vma relocation;
417 bfd_reloc_status_type r;
418
419 r_symndx = ELF32_R_SYM (rel->r_info);
420 r_type = ELF32_R_TYPE (rel->r_info);
421
422 if (r_type == R_D10V_GNU_VTENTRY
423 || r_type == R_D10V_GNU_VTINHERIT)
424 continue;
425
426 howto = elf_d10v_howto_table + r_type;
427 h = NULL;
428 sym = NULL;
429 sec = NULL;
430 if (r_symndx < symtab_hdr->sh_info)
431 {
432 sym = local_syms + r_symndx;
433 sec = local_sections[r_symndx];
434 relocation = (sec->output_section->vma
435 + sec->output_offset
436 + sym->st_value);
437 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
438 && ((sec->flags & SEC_MERGE) != 0
439 || (info->relocatable
440 && sec->output_offset != 0)))
441 {
442 bfd_vma addend;
443 bfd_byte *where = contents + rel->r_offset;
444
445 addend = extract_rel_addend (input_bfd, where, howto);
446
447 if (info->relocatable)
448 addend += sec->output_offset;
449 else
450 {
451 asection *msec = sec;
452 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
453 addend);
454 addend -= relocation;
455 addend += msec->output_section->vma + msec->output_offset;
456 }
457 insert_rel_addend (input_bfd, where, howto, addend);
458 }
459 }
460 else
461 {
462 bfd_boolean unresolved_reloc, warned;
463
464 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
465 r_symndx, symtab_hdr, sym_hashes,
466 h, sec, relocation,
467 unresolved_reloc, warned);
468 }
469
470 if (sec != NULL && discarded_section (sec))
471 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
472 rel, 1, relend, howto, 0, contents);
473
474 if (info->relocatable)
475 continue;
476
477 if (h != NULL)
478 name = h->root.root.string;
479 else
480 {
481 name = (bfd_elf_string_from_elf_section
482 (input_bfd, symtab_hdr->sh_link, sym->st_name));
483 if (name == NULL || *name == '\0')
484 name = bfd_section_name (input_bfd, sec);
485 }
486
487 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
488 contents, rel->r_offset,
489 relocation, (bfd_vma) 0);
490
491 if (r != bfd_reloc_ok)
492 {
493 const char * msg = (const char *) 0;
494
495 switch (r)
496 {
497 case bfd_reloc_overflow:
498 if (!((*info->callbacks->reloc_overflow)
499 (info, (h ? &h->root : NULL), name, howto->name,
500 (bfd_vma) 0, input_bfd, input_section,
501 rel->r_offset)))
502 return FALSE;
503 break;
504
505 case bfd_reloc_undefined:
506 if (!((*info->callbacks->undefined_symbol)
507 (info, name, input_bfd, input_section,
508 rel->r_offset, TRUE)))
509 return FALSE;
510 break;
511
512 case bfd_reloc_outofrange:
513 msg = _("internal error: out of range error");
514 goto common_error;
515
516 case bfd_reloc_notsupported:
517 msg = _("internal error: unsupported relocation error");
518 goto common_error;
519
520 case bfd_reloc_dangerous:
521 msg = _("internal error: dangerous error");
522 goto common_error;
523
524 default:
525 msg = _("internal error: unknown error");
526 /* fall through */
527
528 common_error:
529 if (!((*info->callbacks->warning)
530 (info, msg, name, input_bfd, input_section,
531 rel->r_offset)))
532 return FALSE;
533 break;
534 }
535 }
536 }
537
538 return TRUE;
539 }
540 #define ELF_ARCH bfd_arch_d10v
541 #define ELF_MACHINE_CODE EM_D10V
542 #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V
543 #define ELF_MAXPAGESIZE 0x1000
544
545 #define TARGET_BIG_SYM bfd_elf32_d10v_vec
546 #define TARGET_BIG_NAME "elf32-d10v"
547
548 #define elf_info_to_howto 0
549 #define elf_info_to_howto_rel d10v_info_to_howto_rel
550 #define elf_backend_object_p 0
551 #define elf_backend_final_write_processing 0
552 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
553 #define elf_backend_check_relocs elf32_d10v_check_relocs
554 #define elf_backend_relocate_section elf32_d10v_relocate_section
555 #define elf_backend_can_gc_sections 1
556
557 #include "elf32-target.h"
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