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[deliverable/binutils-gdb.git] / bfd / elf32-d10v.c
1 /* D10V-specific support for 32-bit ELF
2 Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
3 2007 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, **sym_hashes_end;
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 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
275 if (!elf_bad_symtab (abfd))
276 sym_hashes_end -= symtab_hdr->sh_info;
277
278 rel_end = relocs + sec->reloc_count;
279 for (rel = relocs; rel < rel_end; rel++)
280 {
281 struct elf_link_hash_entry *h;
282 unsigned long r_symndx;
283
284 r_symndx = ELF32_R_SYM (rel->r_info);
285 if (r_symndx < symtab_hdr->sh_info)
286 h = NULL;
287 else
288 {
289 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
290 while (h->root.type == bfd_link_hash_indirect
291 || h->root.type == bfd_link_hash_warning)
292 h = (struct elf_link_hash_entry *) h->root.u.i.link;
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
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
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
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;
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);
467 }
468
469 if (sec != NULL && elf_discarded_section (sec))
470 {
471 /* For relocs against symbols from removed linkonce sections,
472 or sections discarded by a linker script, we just want the
473 section contents zeroed. Avoid any special processing. */
474 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
475 rel->r_info = 0;
476 rel->r_addend = 0;
477 continue;
478 }
479
480 if (info->relocatable)
481 continue;
482
483 if (h != NULL)
484 name = h->root.root.string;
485 else
486 {
487 name = (bfd_elf_string_from_elf_section
488 (input_bfd, symtab_hdr->sh_link, sym->st_name));
489 if (name == NULL || *name == '\0')
490 name = bfd_section_name (input_bfd, sec);
491 }
492
493 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
494 contents, rel->r_offset,
495 relocation, (bfd_vma) 0);
496
497 if (r != bfd_reloc_ok)
498 {
499 const char * msg = (const char *) 0;
500
501 switch (r)
502 {
503 case bfd_reloc_overflow:
504 if (!((*info->callbacks->reloc_overflow)
505 (info, (h ? &h->root : NULL), name, howto->name,
506 (bfd_vma) 0, input_bfd, input_section,
507 rel->r_offset)))
508 return FALSE;
509 break;
510
511 case bfd_reloc_undefined:
512 if (!((*info->callbacks->undefined_symbol)
513 (info, name, input_bfd, input_section,
514 rel->r_offset, TRUE)))
515 return FALSE;
516 break;
517
518 case bfd_reloc_outofrange:
519 msg = _("internal error: out of range error");
520 goto common_error;
521
522 case bfd_reloc_notsupported:
523 msg = _("internal error: unsupported relocation error");
524 goto common_error;
525
526 case bfd_reloc_dangerous:
527 msg = _("internal error: dangerous error");
528 goto common_error;
529
530 default:
531 msg = _("internal error: unknown error");
532 /* fall through */
533
534 common_error:
535 if (!((*info->callbacks->warning)
536 (info, msg, name, input_bfd, input_section,
537 rel->r_offset)))
538 return FALSE;
539 break;
540 }
541 }
542 }
543
544 return TRUE;
545 }
546 #define ELF_ARCH bfd_arch_d10v
547 #define ELF_MACHINE_CODE EM_D10V
548 #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V
549 #define ELF_MAXPAGESIZE 0x1000
550
551 #define TARGET_BIG_SYM bfd_elf32_d10v_vec
552 #define TARGET_BIG_NAME "elf32-d10v"
553
554 #define elf_info_to_howto 0
555 #define elf_info_to_howto_rel d10v_info_to_howto_rel
556 #define elf_backend_object_p 0
557 #define elf_backend_final_write_processing 0
558 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
559 #define elf_backend_check_relocs elf32_d10v_check_relocs
560 #define elf_backend_relocate_section elf32_d10v_relocate_section
561 #define elf_backend_can_gc_sections 1
562
563 #include "elf32-target.h"
GDB Binutils - Deliverables
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