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file as.info-5 was initially added on branch binutils-2_10-branch.
[binutils.git] / bfd / elf32-d10v.c
blobdd2e892ad0862dcbb6e4d1effbe627d0d69f21ca
1 /* D10V-specific support for 32-bit ELF
2 Copyright (C) 1996, 1998, 1999 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 ATTRIBUTE_UNUSED;
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 ATTRIBUTE_UNUSED;
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 ATTRIBUTE_UNUSED;
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 default:
272 break;
273 }
274 }
275 }
276 else
277 {
278 if (!(elf_bad_symtab (abfd)
279 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
280 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
281 && sym->st_shndx != SHN_COMMON))
282 {
283 return bfd_section_from_elf_index (abfd, sym->st_shndx);
284 }
285 }
286 return NULL;
287 }
288
289 static boolean
290 elf32_d10v_gc_sweep_hook (abfd, info, sec, relocs)
291 bfd *abfd ATTRIBUTE_UNUSED;
292 struct bfd_link_info *info ATTRIBUTE_UNUSED;
293 asection *sec ATTRIBUTE_UNUSED;
294 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
295 {
296 /* we don't use got and plt entries for d10v */
297 return true;
298 }
299
300 /* Look through the relocs for a section during the first phase.
301 Since we don't do .gots or .plts, we just need to consider the
302 virtual table relocs for gc. */
303
304 static boolean
305 elf32_d10v_check_relocs (abfd, info, sec, relocs)
306 bfd *abfd;
307 struct bfd_link_info *info;
308 asection *sec;
309 const Elf_Internal_Rela *relocs;
310 {
311 Elf_Internal_Shdr *symtab_hdr;
312 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
313 const Elf_Internal_Rela *rel;
314 const Elf_Internal_Rela *rel_end;
315
316 if (info->relocateable)
317 return true;
318
319 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
320 sym_hashes = elf_sym_hashes (abfd);
321 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
322 if (!elf_bad_symtab (abfd))
323 sym_hashes_end -= symtab_hdr->sh_info;
324
325 rel_end = relocs + sec->reloc_count;
326 for (rel = relocs; rel < rel_end; rel++)
327 {
328 struct elf_link_hash_entry *h;
329 unsigned long r_symndx;
330
331 r_symndx = ELF32_R_SYM (rel->r_info);
332 if (r_symndx < symtab_hdr->sh_info)
333 h = NULL;
334 else
335 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
336
337 switch (ELF32_R_TYPE (rel->r_info))
338 {
339 /* This relocation describes the C++ object vtable hierarchy.
340 Reconstruct it for later use during GC. */
341 case R_D10V_GNU_VTINHERIT:
342 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
343 return false;
344 break;
345
346 /* This relocation describes which C++ vtable entries are actually
347 used. Record for later use during GC. */
348 case R_D10V_GNU_VTENTRY:
349 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
350 return false;
351 break;
352 }
353 }
354
355 return true;
356 }
357
358 /* Relocate a D10V ELF section. */
359 static boolean
360 elf32_d10v_relocate_section (output_bfd, info, input_bfd, input_section,
361 contents, relocs, local_syms, local_sections)
362 bfd *output_bfd ATTRIBUTE_UNUSED;
363 struct bfd_link_info *info;
364 bfd *input_bfd;
365 asection *input_section;
366 bfd_byte *contents;
367 Elf_Internal_Rela *relocs;
368 Elf_Internal_Sym *local_syms;
369 asection **local_sections;
370 {
371 Elf_Internal_Shdr *symtab_hdr;
372 struct elf_link_hash_entry **sym_hashes;
373 Elf_Internal_Rela *rel, *relend;
374 const char *name;
375
376 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
377 sym_hashes = elf_sym_hashes (input_bfd);
378
379 rel = relocs;
380 relend = relocs + input_section->reloc_count;
381 for (; rel < relend; rel++)
382 {
383 int r_type;
384 reloc_howto_type *howto;
385 unsigned long r_symndx;
386 Elf_Internal_Sym *sym;
387 asection *sec;
388 struct elf_link_hash_entry *h;
389 bfd_vma relocation;
390 bfd_reloc_status_type r;
391
392 r_symndx = ELF32_R_SYM (rel->r_info);
393 r_type = ELF32_R_TYPE (rel->r_info);
394
395 if (r_type == R_D10V_GNU_VTENTRY
396 || r_type == R_D10V_GNU_VTINHERIT )
397 continue;
398
399 howto = elf_d10v_howto_table + r_type;
400
401 if (info->relocateable)
402 {
403 /* This is a relocateable link. We don't have to change
404 anything, unless the reloc is against a section symbol,
405 in which case we have to adjust according to where the
406 section symbol winds up in the output section. */
407 if (r_symndx < symtab_hdr->sh_info)
408 {
409 sym = local_syms + r_symndx;
410 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
411 {
412 sec = local_sections[r_symndx];
413 rel->r_addend += sec->output_offset + sym->st_value;
414 }
415 }
416
417 continue;
418 }
419
420 /* This is a final link. */
421 h = NULL;
422 sym = NULL;
423 sec = NULL;
424 if (r_symndx < symtab_hdr->sh_info)
425 {
426 sym = local_syms + r_symndx;
427 sec = local_sections[r_symndx];
428 relocation = (sec->output_section->vma
429 + sec->output_offset
430 + sym->st_value);
431 }
432 else
433 {
434 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
435 while (h->root.type == bfd_link_hash_indirect
436 || h->root.type == bfd_link_hash_warning)
437 h = (struct elf_link_hash_entry *) h->root.u.i.link;
438 if (h->root.type == bfd_link_hash_defined
439 || h->root.type == bfd_link_hash_defweak)
440 {
441 sec = h->root.u.def.section;
442 relocation = (h->root.u.def.value
443 + sec->output_section->vma
444 + sec->output_offset);
445 }
446 else if (h->root.type == bfd_link_hash_undefweak)
447 relocation = 0;
448 else
449 {
450 if (!((*info->callbacks->undefined_symbol)
451 (info, h->root.root.string, input_bfd,
452 input_section, rel->r_offset, true)))
453 return false;
454 relocation = 0;
455 }
456 }
457
458 if (h != NULL)
459 name = h->root.root.string;
460 else
461 {
462 name = (bfd_elf_string_from_elf_section
463 (input_bfd, symtab_hdr->sh_link, sym->st_name));
464 if (name == NULL || *name == '\0')
465 name = bfd_section_name (input_bfd, sec);
466 }
467
468 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
469 contents, rel->r_offset,
470 relocation, rel->r_addend);
471
472 if (r != bfd_reloc_ok)
473 {
474 const char * msg = (const char *) 0;
475
476 switch (r)
477 {
478 case bfd_reloc_overflow:
479 if (!((*info->callbacks->reloc_overflow)
480 (info, name, howto->name, (bfd_vma) 0,
481 input_bfd, input_section, rel->r_offset)))
482 return false;
483 break;
484
485 case bfd_reloc_undefined:
486 if (!((*info->callbacks->undefined_symbol)
487 (info, name, input_bfd, input_section,
488 rel->r_offset, true)))
489 return false;
490 break;
491
492 case bfd_reloc_outofrange:
493 msg = _ ("internal error: out of range error");
494 goto common_error;
495
496 case bfd_reloc_notsupported:
497 msg = _ ("internal error: unsupported relocation error");
498 goto common_error;
499
500 case bfd_reloc_dangerous:
501 msg = _ ("internal error: dangerous error");
502 goto common_error;
503
504 default:
505 msg = _ ("internal error: unknown error");
506 /* fall through */
507
508 common_error:
509 if (!((*info->callbacks->warning)
510 (info, msg, name, input_bfd, input_section,
511 rel->r_offset)))
512 return false;
513 break;
514 }
515 }
516 }
517
518 return true;
519 }
520 #define ELF_ARCH bfd_arch_d10v
521 #define ELF_MACHINE_CODE EM_CYGNUS_D10V
522 #define ELF_MAXPAGESIZE 0x1000
523
524 #define TARGET_BIG_SYM bfd_elf32_d10v_vec
525 #define TARGET_BIG_NAME "elf32-d10v"
526
527 #define elf_info_to_howto 0
528 #define elf_info_to_howto_rel d10v_info_to_howto_rel
529 #define elf_backend_object_p 0
530 #define elf_backend_final_write_processing 0
531 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
532 #define elf_backend_gc_sweep_hook elf32_d10v_gc_sweep_hook
533 #define elf_backend_check_relocs elf32_d10v_check_relocs
534 #define elf_backend_relocate_section elf32_d10v_relocate_section
535 #define elf_backend_can_gc_sections 1
536
537 #include "elf32-target.h"
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