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2001-01-01 Philip Blundell <philb@gnu.org>
[binutils.git] / bfd / elf32-d10v.c
bloba4075a5a757c1891d8de983d8050d53ba82620e7
1 /* D10V-specific support for 32-bit ELF
2 Copyright (C) 1996, 1998, 1999, 2000 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 /* Use REL instead of RELA to save space */
33 #define USE_REL
34
35 static reloc_howto_type elf_d10v_howto_table[] =
36 {
37 /* This reloc does nothing. */
38 HOWTO (R_D10V_NONE, /* type */
39 0, /* rightshift */
40 2, /* size (0 = byte, 1 = short, 2 = long) */
41 32, /* bitsize */
42 false, /* pc_relative */
43 0, /* bitpos */
44 complain_overflow_bitfield, /* complain_on_overflow */
45 bfd_elf_generic_reloc, /* special_function */
46 "R_D10V_NONE", /* name */
47 false, /* partial_inplace */
48 0, /* src_mask */
49 0, /* dst_mask */
50 false), /* pcrel_offset */
51
52 /* An PC Relative 10-bit relocation, shifted by 2 */
53 /* right container */
54 HOWTO (R_D10V_10_PCREL_R, /* type */
55 2, /* rightshift */
56 2, /* size (0 = byte, 1 = short, 2 = long) */
57 10, /* bitsize */
58 true, /* pc_relative */
59 0, /* bitpos */
60 complain_overflow_bitfield, /* complain_on_overflow */
61 bfd_elf_generic_reloc, /* special_function */
62 "R_D10V_10_PCREL_R", /* name */
63 false, /* partial_inplace */
64 0xff, /* src_mask */
65 0xff, /* dst_mask */
66 true), /* pcrel_offset */
67
68 /* An PC Relative 10-bit relocation, shifted by 2 */
69 /* left container */
70 HOWTO (R_D10V_10_PCREL_L, /* type */
71 2, /* rightshift */
72 2, /* size (0 = byte, 1 = short, 2 = long) */
73 10, /* bitsize */
74 true, /* pc_relative */
75 15, /* bitpos */
76 complain_overflow_bitfield, /* complain_on_overflow */
77 bfd_elf_generic_reloc, /* special_function */
78 "R_D10V_10_PCREL_L", /* name */
79 false, /* partial_inplace */
80 0x07f8000, /* src_mask */
81 0x07f8000, /* dst_mask */
82 true), /* pcrel_offset */
83
84 /* A 16 bit absolute relocation */
85 HOWTO (R_D10V_16, /* type */
86 0, /* rightshift */
87 1, /* size (0 = byte, 1 = short, 2 = long) */
88 16, /* bitsize */
89 false, /* pc_relative */
90 0, /* bitpos */
91 complain_overflow_dont, /* complain_on_overflow */
92 bfd_elf_generic_reloc, /* special_function */
93 "R_D10V_16", /* name */
94 false, /* partial_inplace */
95 0xffff, /* src_mask */
96 0xffff, /* dst_mask */
97 false), /* pcrel_offset */
98
99 /* An 18 bit absolute relocation, right shifted 2 */
100 HOWTO (R_D10V_18, /* type */
101 2, /* rightshift */
102 1, /* size (0 = byte, 1 = short, 2 = long) */
103 18, /* 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_18", /* name */
109 false, /* partial_inplace */
110 0xffff, /* src_mask */
111 0xffff, /* dst_mask */
112 false), /* pcrel_offset */
113
114 /* A relative 18 bit relocation, right shifted by 2 */
115 HOWTO (R_D10V_18_PCREL, /* type */
116 2, /* rightshift */
117 2, /* size (0 = byte, 1 = short, 2 = long) */
118 18, /* bitsize */
119 true, /* pc_relative */
120 0, /* bitpos */
121 complain_overflow_signed, /* complain_on_overflow */
122 bfd_elf_generic_reloc, /* special_function */
123 "R_D10V_18_PCREL", /* name */
124 false, /* partial_inplace */
125 0xffff, /* src_mask */
126 0xffff, /* dst_mask */
127 true), /* pcrel_offset */
128
129 /* A 32 bit absolute relocation */
130 HOWTO (R_D10V_32, /* type */
131 0, /* rightshift */
132 2, /* size (0 = byte, 1 = short, 2 = long) */
133 32, /* bitsize */
134 false, /* pc_relative */
135 0, /* bitpos */
136 complain_overflow_bitfield, /* complain_on_overflow */
137 bfd_elf_generic_reloc, /* special_function */
138 "R_D10V_32", /* name */
139 false, /* partial_inplace */
140 0xffffffff, /* src_mask */
141 0xffffffff, /* dst_mask */
142 false), /* pcrel_offset */
143
144 /* GNU extension to record C++ vtable hierarchy */
145 HOWTO (R_D10V_GNU_VTINHERIT, /* type */
146 0, /* rightshift */
147 2, /* size (0 = byte, 1 = short, 2 = long) */
148 0, /* bitsize */
149 false, /* pc_relative */
150 0, /* bitpos */
151 complain_overflow_dont, /* complain_on_overflow */
152 NULL, /* special_function */
153 "R_D10V_GNU_VTINHERIT", /* name */
154 false, /* partial_inplace */
155 0, /* src_mask */
156 0, /* dst_mask */
157 false), /* pcrel_offset */
158
159 /* GNU extension to record C++ vtable member usage */
160 HOWTO (R_D10V_GNU_VTENTRY, /* 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 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
168 "R_D10V_GNU_VTENTRY", /* name */
169 false, /* partial_inplace */
170 0, /* src_mask */
171 0, /* dst_mask */
172 false), /* pcrel_offset */
173
174 };
175
176 /* Map BFD reloc types to D10V ELF reloc types. */
177
178 struct d10v_reloc_map
179 {
180 bfd_reloc_code_real_type bfd_reloc_val;
181 unsigned char elf_reloc_val;
182 };
183
184 static const struct d10v_reloc_map d10v_reloc_map[] =
185 {
186 { BFD_RELOC_NONE, R_D10V_NONE, },
187 { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R },
188 { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L },
189 { BFD_RELOC_16, R_D10V_16 },
190 { BFD_RELOC_D10V_18, R_D10V_18 },
191 { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL },
192 { BFD_RELOC_32, R_D10V_32 },
193 { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT },
194 { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY },
195 };
196
197 static reloc_howto_type *
198 bfd_elf32_bfd_reloc_type_lookup (abfd, code)
199 bfd *abfd ATTRIBUTE_UNUSED;
200 bfd_reloc_code_real_type code;
201 {
202 unsigned int i;
203
204 for (i = 0;
205 i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map);
206 i++)
207 {
208 if (d10v_reloc_map[i].bfd_reloc_val == code)
209 return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val];
210 }
211
212 return NULL;
213 }
214
215 /* Set the howto pointer for an D10V ELF reloc. */
216
217 static void
218 d10v_info_to_howto_rel (abfd, cache_ptr, dst)
219 bfd *abfd ATTRIBUTE_UNUSED;
220 arelent *cache_ptr;
221 Elf32_Internal_Rel *dst;
222 {
223 unsigned int r_type;
224
225 r_type = ELF32_R_TYPE (dst->r_info);
226 BFD_ASSERT (r_type < (unsigned int) R_D10V_max);
227 cache_ptr->howto = &elf_d10v_howto_table[r_type];
228 }
229
230 static asection *
231 elf32_d10v_gc_mark_hook (abfd, info, rel, h, sym)
232 bfd *abfd;
233 struct bfd_link_info *info ATTRIBUTE_UNUSED;
234 Elf_Internal_Rela *rel;
235 struct elf_link_hash_entry *h;
236 Elf_Internal_Sym *sym;
237 {
238 if (h != NULL)
239 {
240 switch (ELF32_R_TYPE (rel->r_info))
241 {
242 case R_D10V_GNU_VTINHERIT:
243 case R_D10V_GNU_VTENTRY:
244 break;
245
246 default:
247 switch (h->root.type)
248 {
249 case bfd_link_hash_defined:
250 case bfd_link_hash_defweak:
251 return h->root.u.def.section;
252
253 case bfd_link_hash_common:
254 return h->root.u.c.p->section;
255
256 default:
257 break;
258 }
259 }
260 }
261 else
262 {
263 if (!(elf_bad_symtab (abfd)
264 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
265 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
266 && sym->st_shndx != SHN_COMMON))
267 {
268 return bfd_section_from_elf_index (abfd, sym->st_shndx);
269 }
270 }
271 return NULL;
272 }
273
274 static boolean
275 elf32_d10v_gc_sweep_hook (abfd, info, sec, relocs)
276 bfd *abfd ATTRIBUTE_UNUSED;
277 struct bfd_link_info *info ATTRIBUTE_UNUSED;
278 asection *sec ATTRIBUTE_UNUSED;
279 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
280 {
281 /* we don't use got and plt entries for d10v */
282 return true;
283 }
284
285 /* Look through the relocs for a section during the first phase.
286 Since we don't do .gots or .plts, we just need to consider the
287 virtual table relocs for gc. */
288
289 static boolean
290 elf32_d10v_check_relocs (abfd, info, sec, relocs)
291 bfd *abfd;
292 struct bfd_link_info *info;
293 asection *sec;
294 const Elf_Internal_Rela *relocs;
295 {
296 Elf_Internal_Shdr *symtab_hdr;
297 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
298 const Elf_Internal_Rela *rel;
299 const Elf_Internal_Rela *rel_end;
300
301 if (info->relocateable)
302 return true;
303
304 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
305 sym_hashes = elf_sym_hashes (abfd);
306 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
307 if (!elf_bad_symtab (abfd))
308 sym_hashes_end -= symtab_hdr->sh_info;
309
310 rel_end = relocs + sec->reloc_count;
311 for (rel = relocs; rel < rel_end; rel++)
312 {
313 struct elf_link_hash_entry *h;
314 unsigned long r_symndx;
315
316 r_symndx = ELF32_R_SYM (rel->r_info);
317 if (r_symndx < symtab_hdr->sh_info)
318 h = NULL;
319 else
320 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
321
322 switch (ELF32_R_TYPE (rel->r_info))
323 {
324 /* This relocation describes the C++ object vtable hierarchy.
325 Reconstruct it for later use during GC. */
326 case R_D10V_GNU_VTINHERIT:
327 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
328 return false;
329 break;
330
331 /* This relocation describes which C++ vtable entries are actually
332 used. Record for later use during GC. */
333 case R_D10V_GNU_VTENTRY:
334 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
335 return false;
336 break;
337 }
338 }
339
340 return true;
341 }
342
343 /* Relocate a D10V ELF section. */
344 static boolean
345 elf32_d10v_relocate_section (output_bfd, info, input_bfd, input_section,
346 contents, relocs, local_syms, local_sections)
347 bfd *output_bfd ATTRIBUTE_UNUSED;
348 struct bfd_link_info *info;
349 bfd *input_bfd;
350 asection *input_section;
351 bfd_byte *contents;
352 Elf_Internal_Rela *relocs;
353 Elf_Internal_Sym *local_syms;
354 asection **local_sections;
355 {
356 Elf_Internal_Shdr *symtab_hdr;
357 struct elf_link_hash_entry **sym_hashes;
358 Elf_Internal_Rela *rel, *relend;
359 const char *name;
360
361 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
362 sym_hashes = elf_sym_hashes (input_bfd);
363
364 rel = relocs;
365 relend = relocs + input_section->reloc_count;
366 for (; rel < relend; rel++)
367 {
368 int r_type;
369 reloc_howto_type *howto;
370 unsigned long r_symndx;
371 Elf_Internal_Sym *sym;
372 asection *sec;
373 struct elf_link_hash_entry *h;
374 bfd_vma relocation;
375 bfd_reloc_status_type r;
376
377 r_symndx = ELF32_R_SYM (rel->r_info);
378 r_type = ELF32_R_TYPE (rel->r_info);
379
380 if (r_type == R_D10V_GNU_VTENTRY
381 || r_type == R_D10V_GNU_VTINHERIT )
382 continue;
383
384 howto = elf_d10v_howto_table + r_type;
385
386 if (info->relocateable)
387 {
388 /* This is a relocateable link. We don't have to change
389 anything, unless the reloc is against a section symbol,
390 in which case we have to adjust according to where the
391 section symbol winds up in the output section. */
392 if (r_symndx < symtab_hdr->sh_info)
393 {
394 sym = local_syms + r_symndx;
395 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
396 {
397 sec = local_sections[r_symndx];
398 rel->r_addend += sec->output_offset + sym->st_value;
399 }
400 }
401
402 continue;
403 }
404
405 /* This is a final link. */
406 h = NULL;
407 sym = NULL;
408 sec = NULL;
409 if (r_symndx < symtab_hdr->sh_info)
410 {
411 sym = local_syms + r_symndx;
412 sec = local_sections[r_symndx];
413 relocation = (sec->output_section->vma
414 + sec->output_offset
415 + sym->st_value);
416 }
417 else
418 {
419 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
420 while (h->root.type == bfd_link_hash_indirect
421 || h->root.type == bfd_link_hash_warning)
422 h = (struct elf_link_hash_entry *) h->root.u.i.link;
423 if (h->root.type == bfd_link_hash_defined
424 || h->root.type == bfd_link_hash_defweak)
425 {
426 sec = h->root.u.def.section;
427 relocation = (h->root.u.def.value
428 + sec->output_section->vma
429 + sec->output_offset);
430 }
431 else if (h->root.type == bfd_link_hash_undefweak)
432 relocation = 0;
433 else
434 {
435 if (!((*info->callbacks->undefined_symbol)
436 (info, h->root.root.string, input_bfd,
437 input_section, rel->r_offset, true)))
438 return false;
439 relocation = 0;
440 }
441 }
442
443 if (h != NULL)
444 name = h->root.root.string;
445 else
446 {
447 name = (bfd_elf_string_from_elf_section
448 (input_bfd, symtab_hdr->sh_link, sym->st_name));
449 if (name == NULL || *name == '\0')
450 name = bfd_section_name (input_bfd, sec);
451 }
452
453 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
454 contents, rel->r_offset,
455 relocation, rel->r_addend);
456
457 if (r != bfd_reloc_ok)
458 {
459 const char * msg = (const char *) 0;
460
461 switch (r)
462 {
463 case bfd_reloc_overflow:
464 if (!((*info->callbacks->reloc_overflow)
465 (info, name, howto->name, (bfd_vma) 0,
466 input_bfd, input_section, rel->r_offset)))
467 return false;
468 break;
469
470 case bfd_reloc_undefined:
471 if (!((*info->callbacks->undefined_symbol)
472 (info, name, input_bfd, input_section,
473 rel->r_offset, true)))
474 return false;
475 break;
476
477 case bfd_reloc_outofrange:
478 msg = _ ("internal error: out of range error");
479 goto common_error;
480
481 case bfd_reloc_notsupported:
482 msg = _ ("internal error: unsupported relocation error");
483 goto common_error;
484
485 case bfd_reloc_dangerous:
486 msg = _ ("internal error: dangerous error");
487 goto common_error;
488
489 default:
490 msg = _ ("internal error: unknown error");
491 /* fall through */
492
493 common_error:
494 if (!((*info->callbacks->warning)
495 (info, msg, name, input_bfd, input_section,
496 rel->r_offset)))
497 return false;
498 break;
499 }
500 }
501 }
502
503 return true;
504 }
505 #define ELF_ARCH bfd_arch_d10v
506 #define ELF_MACHINE_CODE EM_CYGNUS_D10V
507 #define ELF_MAXPAGESIZE 0x1000
508
509 #define TARGET_BIG_SYM bfd_elf32_d10v_vec
510 #define TARGET_BIG_NAME "elf32-d10v"
511
512 #define elf_info_to_howto 0
513 #define elf_info_to_howto_rel d10v_info_to_howto_rel
514 #define elf_backend_object_p 0
515 #define elf_backend_final_write_processing 0
516 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
517 #define elf_backend_gc_sweep_hook elf32_d10v_gc_sweep_hook
518 #define elf_backend_check_relocs elf32_d10v_check_relocs
519 #define elf_backend_relocate_section elf32_d10v_relocate_section
520 #define elf_backend_can_gc_sections 1
521
522 #include "elf32-target.h"
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