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ld/
[binutils.git] / bfd / elf32-d10v.c
blob2966f28edbbfac8b73728551942d7865140310e8
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 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 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 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
308 return FALSE;
309 break;
310 }
311 }
312
313 return TRUE;
314 }
315
316 static bfd_vma
317 extract_rel_addend (bfd *abfd,
318 bfd_byte *where,
319 reloc_howto_type *howto)
320 {
321 bfd_vma insn, val;
322
323 switch (howto->size)
324 {
325 case 0:
326 insn = bfd_get_8 (abfd, where);
327 break;
328 case 1:
329 insn = bfd_get_16 (abfd, where);
330 break;
331 case 2:
332 insn = bfd_get_32 (abfd, where);
333 break;
334 default:
335 abort ();
336 }
337
338 val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift;
339 /* We should really be testing for signed addends here, but we don't
340 have that info directly in the howto. */
341 if (howto->pc_relative)
342 {
343 bfd_vma sign;
344 sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1));
345 sign = sign >> howto->bitpos << howto->rightshift;
346 val = (val ^ sign) - sign;
347 }
348 return val;
349 }
350
351 static void
352 insert_rel_addend (bfd *abfd,
353 bfd_byte *where,
354 reloc_howto_type *howto,
355 bfd_vma addend)
356 {
357 bfd_vma insn;
358
359 addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask;
360 insn = ~howto->dst_mask;
361 switch (howto->size)
362 {
363 case 0:
364 insn &= bfd_get_8 (abfd, where);
365 insn |= addend;
366 bfd_put_8 (abfd, insn, where);
367 break;
368 case 1:
369 insn &= bfd_get_16 (abfd, where);
370 insn |= addend;
371 bfd_put_16 (abfd, insn, where);
372 break;
373 case 2:
374 insn &= bfd_get_32 (abfd, where);
375 insn |= addend;
376 bfd_put_32 (abfd, insn, where);
377 break;
378 default:
379 abort ();
380 }
381 }
382
383 /* Relocate a D10V ELF section. */
384
385 static bfd_boolean
386 elf32_d10v_relocate_section (bfd *output_bfd,
387 struct bfd_link_info *info,
388 bfd *input_bfd,
389 asection *input_section,
390 bfd_byte *contents,
391 Elf_Internal_Rela *relocs,
392 Elf_Internal_Sym *local_syms,
393 asection **local_sections)
394 {
395 Elf_Internal_Shdr *symtab_hdr;
396 struct elf_link_hash_entry **sym_hashes;
397 Elf_Internal_Rela *rel, *relend;
398 const char *name;
399
400 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
401 sym_hashes = elf_sym_hashes (input_bfd);
402
403 rel = relocs;
404 relend = relocs + input_section->reloc_count;
405 for (; rel < relend; rel++)
406 {
407 int r_type;
408 reloc_howto_type *howto;
409 unsigned long r_symndx;
410 Elf_Internal_Sym *sym;
411 asection *sec;
412 struct elf_link_hash_entry *h;
413 bfd_vma relocation;
414 bfd_reloc_status_type r;
415
416 r_symndx = ELF32_R_SYM (rel->r_info);
417 r_type = ELF32_R_TYPE (rel->r_info);
418
419 if (r_type == R_D10V_GNU_VTENTRY
420 || r_type == R_D10V_GNU_VTINHERIT)
421 continue;
422
423 howto = elf_d10v_howto_table + r_type;
424 h = NULL;
425 sym = NULL;
426 sec = NULL;
427 if (r_symndx < symtab_hdr->sh_info)
428 {
429 sym = local_syms + r_symndx;
430 sec = local_sections[r_symndx];
431 relocation = (sec->output_section->vma
432 + sec->output_offset
433 + sym->st_value);
434 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
435 && ((sec->flags & SEC_MERGE) != 0
436 || (info->relocatable
437 && sec->output_offset != 0)))
438 {
439 bfd_vma addend;
440 bfd_byte *where = contents + rel->r_offset;
441
442 addend = extract_rel_addend (input_bfd, where, howto);
443
444 if (info->relocatable)
445 addend += sec->output_offset;
446 else
447 {
448 asection *msec = sec;
449 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
450 addend);
451 addend -= relocation;
452 addend += msec->output_section->vma + msec->output_offset;
453 }
454 insert_rel_addend (input_bfd, where, howto, addend);
455 }
456 }
457 else
458 {
459 bfd_boolean unresolved_reloc, warned;
460
461 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
462 r_symndx, symtab_hdr, sym_hashes,
463 h, sec, relocation,
464 unresolved_reloc, warned);
465 }
466
467 if (sec != NULL && elf_discarded_section (sec))
468 {
469 /* For relocs against symbols from removed linkonce sections,
470 or sections discarded by a linker script, we just want the
471 section contents zeroed. Avoid any special processing. */
472 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
473 rel->r_info = 0;
474 rel->r_addend = 0;
475 continue;
476 }
477
478 if (info->relocatable)
479 continue;
480
481 if (h != NULL)
482 name = h->root.root.string;
483 else
484 {
485 name = (bfd_elf_string_from_elf_section
486 (input_bfd, symtab_hdr->sh_link, sym->st_name));
487 if (name == NULL || *name == '\0')
488 name = bfd_section_name (input_bfd, sec);
489 }
490
491 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
492 contents, rel->r_offset,
493 relocation, (bfd_vma) 0);
494
495 if (r != bfd_reloc_ok)
496 {
497 const char * msg = (const char *) 0;
498
499 switch (r)
500 {
501 case bfd_reloc_overflow:
502 if (!((*info->callbacks->reloc_overflow)
503 (info, (h ? &h->root : NULL), name, howto->name,
504 (bfd_vma) 0, input_bfd, input_section,
505 rel->r_offset)))
506 return FALSE;
507 break;
508
509 case bfd_reloc_undefined:
510 if (!((*info->callbacks->undefined_symbol)
511 (info, name, input_bfd, input_section,
512 rel->r_offset, TRUE)))
513 return FALSE;
514 break;
515
516 case bfd_reloc_outofrange:
517 msg = _("internal error: out of range error");
518 goto common_error;
519
520 case bfd_reloc_notsupported:
521 msg = _("internal error: unsupported relocation error");
522 goto common_error;
523
524 case bfd_reloc_dangerous:
525 msg = _("internal error: dangerous error");
526 goto common_error;
527
528 default:
529 msg = _("internal error: unknown error");
530 /* fall through */
531
532 common_error:
533 if (!((*info->callbacks->warning)
534 (info, msg, name, input_bfd, input_section,
535 rel->r_offset)))
536 return FALSE;
537 break;
538 }
539 }
540 }
541
542 return TRUE;
543 }
544 #define ELF_ARCH bfd_arch_d10v
545 #define ELF_MACHINE_CODE EM_D10V
546 #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V
547 #define ELF_MAXPAGESIZE 0x1000
548
549 #define TARGET_BIG_SYM bfd_elf32_d10v_vec
550 #define TARGET_BIG_NAME "elf32-d10v"
551
552 #define elf_info_to_howto 0
553 #define elf_info_to_howto_rel d10v_info_to_howto_rel
554 #define elf_backend_object_p 0
555 #define elf_backend_final_write_processing 0
556 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
557 #define elf_backend_check_relocs elf32_d10v_check_relocs
558 #define elf_backend_relocate_section elf32_d10v_relocate_section
559 #define elf_backend_can_gc_sections 1
560
561 #include "elf32-target.h"
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