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[binutils.git] / bfd / elf32-d10v.c
blobbe80bae2e9b7b041234be162020c252e0e805f1f
1 /* D10V-specific support for 32-bit ELF
2 Copyright (C) 1996 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "libbfd.h"
24 #include "elf-bfd.h"
25 /* #include "elf/d10v.h" */
26
27 static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
28 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
29 static void d10v_info_to_howto_rel
30 PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
31
32
33 /* Use REL instead of RELA to save space */
34 #define USE_REL
35
36 enum reloc_type
37 {
38 R_D10V_NONE = 0,
39 R_D10V_10_PCREL_R,
40 R_D10V_10_PCREL_L,
41 R_D10V_16,
42 R_D10V_18,
43 R_D10V_18_PCREL,
44 R_D10V_32,
45 R_D10V_GNU_VTINHERIT,
46 R_D10V_GNU_VTENTRY,
47 R_D10V_max
48 };
49
50 static reloc_howto_type elf_d10v_howto_table[] =
51 {
52 /* This reloc does nothing. */
53 HOWTO (R_D10V_NONE, /* type */
54 0, /* rightshift */
55 2, /* size (0 = byte, 1 = short, 2 = long) */
56 32, /* bitsize */
57 false, /* pc_relative */
58 0, /* bitpos */
59 complain_overflow_bitfield, /* complain_on_overflow */
60 bfd_elf_generic_reloc, /* special_function */
61 "R_D10V_NONE", /* name */
62 false, /* partial_inplace */
63 0, /* src_mask */
64 0, /* dst_mask */
65 false), /* pcrel_offset */
66
67 /* An PC Relative 10-bit relocation, shifted by 2 */
68 /* right container */
69 HOWTO (R_D10V_10_PCREL_R, /* type */
70 2, /* rightshift */
71 2, /* size (0 = byte, 1 = short, 2 = long) */
72 10, /* bitsize */
73 true, /* pc_relative */
74 0, /* bitpos */
75 complain_overflow_bitfield, /* complain_on_overflow */
76 bfd_elf_generic_reloc, /* special_function */
77 "R_D10V_10_PCREL_R", /* name */
78 false, /* partial_inplace */
79 0xff, /* src_mask */
80 0xff, /* dst_mask */
81 true), /* pcrel_offset */
82
83 /* An PC Relative 10-bit relocation, shifted by 2 */
84 /* left container */
85 HOWTO (R_D10V_10_PCREL_L, /* type */
86 2, /* rightshift */
87 2, /* size (0 = byte, 1 = short, 2 = long) */
88 10, /* bitsize */
89 true, /* pc_relative */
90 15, /* bitpos */
91 complain_overflow_bitfield, /* complain_on_overflow */
92 bfd_elf_generic_reloc, /* special_function */
93 "R_D10V_10_PCREL_L", /* name */
94 false, /* partial_inplace */
95 0x07f8000, /* src_mask */
96 0x07f8000, /* dst_mask */
97 true), /* pcrel_offset */
98
99 /* A 16 bit absolute relocation */
100 HOWTO (R_D10V_16, /* type */
101 0, /* rightshift */
102 1, /* size (0 = byte, 1 = short, 2 = long) */
103 16, /* bitsize */
104 false, /* pc_relative */
105 0, /* bitpos */
106 complain_overflow_dont, /* complain_on_overflow */
107 bfd_elf_generic_reloc, /* special_function */
108 "R_D10V_16", /* name */
109 false, /* partial_inplace */
110 0xffff, /* src_mask */
111 0xffff, /* dst_mask */
112 false), /* pcrel_offset */
113
114 /* An 18 bit absolute relocation, right shifted 2 */
115 HOWTO (R_D10V_18, /* type */
116 2, /* rightshift */
117 1, /* size (0 = byte, 1 = short, 2 = long) */
118 18, /* bitsize */
119 false, /* pc_relative */
120 0, /* bitpos */
121 complain_overflow_dont, /* complain_on_overflow */
122 bfd_elf_generic_reloc, /* special_function */
123 "R_D10V_18", /* name */
124 false, /* partial_inplace */
125 0xffff, /* src_mask */
126 0xffff, /* dst_mask */
127 false), /* pcrel_offset */
128
129 /* A relative 18 bit relocation, right shifted by 2 */
130 HOWTO (R_D10V_18_PCREL, /* type */
131 2, /* rightshift */
132 2, /* size (0 = byte, 1 = short, 2 = long) */
133 18, /* bitsize */
134 true, /* pc_relative */
135 0, /* bitpos */
136 complain_overflow_signed, /* complain_on_overflow */
137 bfd_elf_generic_reloc, /* special_function */
138 "R_D10V_18_PCREL", /* name */
139 false, /* partial_inplace */
140 0xffff, /* src_mask */
141 0xffff, /* dst_mask */
142 true), /* pcrel_offset */
143
144 /* A 32 bit absolute relocation */
145 HOWTO (R_D10V_32, /* type */
146 0, /* rightshift */
147 2, /* size (0 = byte, 1 = short, 2 = long) */
148 32, /* bitsize */
149 false, /* pc_relative */
150 0, /* bitpos */
151 complain_overflow_bitfield, /* complain_on_overflow */
152 bfd_elf_generic_reloc, /* special_function */
153 "R_D10V_32", /* name */
154 false, /* partial_inplace */
155 0xffffffff, /* src_mask */
156 0xffffffff, /* dst_mask */
157 false), /* pcrel_offset */
158
159 /* GNU extension to record C++ vtable hierarchy */
160 HOWTO (R_D10V_GNU_VTINHERIT, /* type */
161 0, /* rightshift */
162 2, /* size (0 = byte, 1 = short, 2 = long) */
163 0, /* bitsize */
164 false, /* pc_relative */
165 0, /* bitpos */
166 complain_overflow_dont, /* complain_on_overflow */
167 NULL, /* special_function */
168 "R_D10V_GNU_VTINHERIT", /* name */
169 false, /* partial_inplace */
170 0, /* src_mask */
171 0, /* dst_mask */
172 false), /* pcrel_offset */
173
174 /* GNU extension to record C++ vtable member usage */
175 HOWTO (R_D10V_GNU_VTENTRY, /* type */
176 0, /* rightshift */
177 2, /* size (0 = byte, 1 = short, 2 = long) */
178 0, /* bitsize */
179 false, /* pc_relative */
180 0, /* bitpos */
181 complain_overflow_dont, /* complain_on_overflow */
182 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
183 "R_D10V_GNU_VTENTRY", /* name */
184 false, /* partial_inplace */
185 0, /* src_mask */
186 0, /* dst_mask */
187 false), /* pcrel_offset */
188
189 };
190
191 /* Map BFD reloc types to D10V ELF reloc types. */
192
193 struct d10v_reloc_map
194 {
195 bfd_reloc_code_real_type bfd_reloc_val;
196 unsigned char elf_reloc_val;
197 };
198
199 static const struct d10v_reloc_map d10v_reloc_map[] =
200 {
201 { BFD_RELOC_NONE, R_D10V_NONE, },
202 { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R },
203 { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L },
204 { BFD_RELOC_16, R_D10V_16 },
205 { BFD_RELOC_D10V_18, R_D10V_18 },
206 { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL },
207 { BFD_RELOC_32, R_D10V_32 },
208 { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT },
209 { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY },
210 };
211
212 static reloc_howto_type *
213 bfd_elf32_bfd_reloc_type_lookup (abfd, code)
214 bfd *abfd;
215 bfd_reloc_code_real_type code;
216 {
217 unsigned int i;
218
219 for (i = 0;
220 i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map);
221 i++)
222 {
223 if (d10v_reloc_map[i].bfd_reloc_val == code)
224 return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val];
225 }
226
227 return NULL;
228 }
229
230 /* Set the howto pointer for an D10V ELF reloc. */
231
232 static void
233 d10v_info_to_howto_rel (abfd, cache_ptr, dst)
234 bfd *abfd;
235 arelent *cache_ptr;
236 Elf32_Internal_Rel *dst;
237 {
238 unsigned int r_type;
239
240 r_type = ELF32_R_TYPE (dst->r_info);
241 BFD_ASSERT (r_type < (unsigned int) R_D10V_max);
242 cache_ptr->howto = &elf_d10v_howto_table[r_type];
243 }
244
245 static asection *
246 elf32_d10v_gc_mark_hook (abfd, info, rel, h, sym)
247 bfd *abfd;
248 struct bfd_link_info *info;
249 Elf_Internal_Rela *rel;
250 struct elf_link_hash_entry *h;
251 Elf_Internal_Sym *sym;
252 {
253 if (h != NULL)
254 {
255 switch (ELF32_R_TYPE (rel->r_info))
256 {
257 case R_D10V_GNU_VTINHERIT:
258 case R_D10V_GNU_VTENTRY:
259 break;
260
261 default:
262 switch (h->root.type)
263 {
264 case bfd_link_hash_defined:
265 case bfd_link_hash_defweak:
266 return h->root.u.def.section;
267
268 case bfd_link_hash_common:
269 return h->root.u.c.p->section;
270 }
271 }
272 }
273 else
274 {
275 if (!(elf_bad_symtab (abfd)
276 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
277 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
278 && sym->st_shndx != SHN_COMMON))
279 {
280 return bfd_section_from_elf_index (abfd, sym->st_shndx);
281 }
282 }
283 return NULL;
284 }
285
286 static boolean
287 elf32_d10v_gc_sweep_hook (abfd, info, sec, relocs)
288 bfd *abfd;
289 struct bfd_link_info *info;
290 asection *sec;
291 const Elf_Internal_Rela *relocs;
292 {
293 /* we don't use got and plt entries for d10v */
294 return true;
295 }
296
297 /* Look through the relocs for a section during the first phase.
298 Since we don't do .gots or .plts, we just need to consider the
299 virtual table relocs for gc. */
300
301 static boolean
302 elf32_d10v_check_relocs (abfd, info, sec, relocs)
303 bfd *abfd;
304 struct bfd_link_info *info;
305 asection *sec;
306 const Elf_Internal_Rela *relocs;
307 {
308 Elf_Internal_Shdr *symtab_hdr;
309 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
310 const Elf_Internal_Rela *rel;
311 const Elf_Internal_Rela *rel_end;
312
313 if (info->relocateable)
314 return true;
315
316 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
317 sym_hashes = elf_sym_hashes (abfd);
318 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
319 if (!elf_bad_symtab (abfd))
320 sym_hashes_end -= symtab_hdr->sh_info;
321
322 rel_end = relocs + sec->reloc_count;
323 for (rel = relocs; rel < rel_end; rel++)
324 {
325 struct elf_link_hash_entry *h;
326 unsigned long r_symndx;
327
328 r_symndx = ELF32_R_SYM (rel->r_info);
329 if (r_symndx < symtab_hdr->sh_info)
330 h = NULL;
331 else
332 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
333
334 switch (ELF32_R_TYPE (rel->r_info))
335 {
336 /* This relocation describes the C++ object vtable hierarchy.
337 Reconstruct it for later use during GC. */
338 case R_D10V_GNU_VTINHERIT:
339 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
340 return false;
341 break;
342
343 /* This relocation describes which C++ vtable entries are actually
344 used. Record for later use during GC. */
345 case R_D10V_GNU_VTENTRY:
346 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
347 return false;
348 break;
349 }
350 }
351
352 return true;
353 }
354
355 /* Relocate a D10V ELF section. */
356 static boolean
357 elf32_d10v_relocate_section (output_bfd, info, input_bfd, input_section,
358 contents, relocs, local_syms, local_sections)
359 bfd *output_bfd;
360 struct bfd_link_info *info;
361 bfd *input_bfd;
362 asection *input_section;
363 bfd_byte *contents;
364 Elf_Internal_Rela *relocs;
365 Elf_Internal_Sym *local_syms;
366 asection **local_sections;
367 {
368 Elf_Internal_Shdr *symtab_hdr;
369 struct elf_link_hash_entry **sym_hashes;
370 Elf_Internal_Rela *rel, *relend;
371 const char *name;
372
373 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
374 sym_hashes = elf_sym_hashes (input_bfd);
375
376 rel = relocs;
377 relend = relocs + input_section->reloc_count;
378 for (; rel < relend; rel++)
379 {
380 int r_type;
381 reloc_howto_type *howto;
382 unsigned long r_symndx;
383 Elf_Internal_Sym *sym;
384 asection *sec;
385 struct elf_link_hash_entry *h;
386 bfd_vma relocation;
387 bfd_reloc_status_type r;
388
389 r_symndx = ELF32_R_SYM (rel->r_info);
390 r_type = ELF32_R_TYPE (rel->r_info);
391
392 if (r_type == R_D10V_GNU_VTENTRY
393 || r_type == R_D10V_GNU_VTINHERIT )
394 continue;
395
396 howto = elf_d10v_howto_table + r_type;
397
398 if (info->relocateable)
399 {
400 /* This is a relocateable link. We don't have to change
401 anything, unless the reloc is against a section symbol,
402 in which case we have to adjust according to where the
403 section symbol winds up in the output section. */
404 if (r_symndx < symtab_hdr->sh_info)
405 {
406 sym = local_syms + r_symndx;
407 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
408 {
409 sec = local_sections[r_symndx];
410 rel->r_addend += sec->output_offset + sym->st_value;
411 }
412 }
413
414 continue;
415 }
416
417 /* This is a final link. */
418 h = NULL;
419 sym = NULL;
420 sec = NULL;
421 if (r_symndx < symtab_hdr->sh_info)
422 {
423 sym = local_syms + r_symndx;
424 sec = local_sections[r_symndx];
425 relocation = (sec->output_section->vma
426 + sec->output_offset
427 + sym->st_value);
428 }
429 else
430 {
431 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
432 while (h->root.type == bfd_link_hash_indirect
433 || h->root.type == bfd_link_hash_warning)
434 h = (struct elf_link_hash_entry *) h->root.u.i.link;
435 if (h->root.type == bfd_link_hash_defined
436 || h->root.type == bfd_link_hash_defweak)
437 {
438 sec = h->root.u.def.section;
439 relocation = (h->root.u.def.value
440 + sec->output_section->vma
441 + sec->output_offset);
442 }
443 else if (h->root.type == bfd_link_hash_undefweak)
444 relocation = 0;
445 else
446 {
447 if (!((*info->callbacks->undefined_symbol)
448 (info, h->root.root.string, input_bfd,
449 input_section, rel->r_offset)))
450 return false;
451 relocation = 0;
452 }
453 }
454
455 if (h != NULL)
456 name = h->root.root.string;
457 else
458 {
459 name = (bfd_elf_string_from_elf_section
460 (input_bfd, symtab_hdr->sh_link, sym->st_name));
461 if (name == NULL || *name == '\0')
462 name = bfd_section_name (input_bfd, sec);
463 }
464
465 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
466 contents, rel->r_offset,
467 relocation, rel->r_addend);
468
469 if (r != bfd_reloc_ok)
470 {
471 const char * msg = (const char *) 0;
472
473 switch (r)
474 {
475 case bfd_reloc_overflow:
476 if (!((*info->callbacks->reloc_overflow)
477 (info, name, howto->name, (bfd_vma) 0,
478 input_bfd, input_section, rel->r_offset)))
479 return false;
480 break;
481
482 case bfd_reloc_undefined:
483 if (!((*info->callbacks->undefined_symbol)
484 (info, name, input_bfd, input_section,
485 rel->r_offset)))
486 return false;
487 break;
488
489 case bfd_reloc_outofrange:
490 msg = _ ("internal error: out of range error");
491 goto common_error;
492
493 case bfd_reloc_notsupported:
494 msg = _ ("internal error: unsupported relocation error");
495 goto common_error;
496
497 case bfd_reloc_dangerous:
498 msg = _ ("internal error: dangerous error");
499 goto common_error;
500
501 default:
502 msg = _ ("internal error: unknown error");
503 /* fall through */
504
505 common_error:
506 if (!((*info->callbacks->warning)
507 (info, msg, name, input_bfd, input_section,
508 rel->r_offset)))
509 return false;
510 break;
511 }
512 }
513 }
514
515 return true;
516 }
517 #define ELF_ARCH bfd_arch_d10v
518 #define ELF_MACHINE_CODE EM_CYGNUS_D10V
519 #define ELF_MAXPAGESIZE 0x1000
520
521 #define TARGET_BIG_SYM bfd_elf32_d10v_vec
522 #define TARGET_BIG_NAME "elf32-d10v"
523
524 #define elf_info_to_howto 0
525 #define elf_info_to_howto_rel d10v_info_to_howto_rel
526 #define elf_backend_object_p 0
527 #define elf_backend_final_write_processing 0
528 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
529 #define elf_backend_gc_sweep_hook elf32_d10v_gc_sweep_hook
530 #define elf_backend_check_relocs elf32_d10v_check_relocs
531 #define elf_backend_relocate_section elf32_d10v_relocate_section
532 #define elf_backend_can_gc_sections 1
533
534 #include "elf32-target.h"
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