source: trunk/binutils/bfd/elf32-d10v.c@ 3873

Last change on this file since 3873 was 610, checked in by bird, 22 years ago

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1/* D10V-specific support for 32-bit ELF
2 Copyright 1996, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
3 Contributed by Martin Hunt (hunt@cygnus.com).
4
5This file is part of BFD, the Binary File Descriptor library.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, 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
27static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
28 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
29static void d10v_info_to_howto_rel
30 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
31static asection * elf32_d10v_gc_mark_hook
32 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
33 struct elf_link_hash_entry *, Elf_Internal_Sym *));
34static bfd_boolean elf32_d10v_gc_sweep_hook
35 PARAMS ((bfd *, struct bfd_link_info *, asection *,
36 const Elf_Internal_Rela *));
37static bfd_boolean elf32_d10v_check_relocs
38 PARAMS ((bfd *, struct bfd_link_info *, asection *,
39 const Elf_Internal_Rela *));
40static bfd_boolean elf32_d10v_relocate_section
41 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,
42 bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *,
43 asection **));
44
45/* Use REL instead of RELA to save space. */
46#define USE_REL 1
47
48static reloc_howto_type elf_d10v_howto_table[] =
49 {
50 /* This reloc does nothing. */
51 HOWTO (R_D10V_NONE, /* type */
52 0, /* rightshift */
53 2, /* size (0 = byte, 1 = short, 2 = long) */
54 32, /* bitsize */
55 FALSE, /* pc_relative */
56 0, /* bitpos */
57 complain_overflow_dont, /* complain_on_overflow */
58 bfd_elf_generic_reloc, /* special_function */
59 "R_D10V_NONE", /* name */
60 FALSE, /* partial_inplace */
61 0, /* src_mask */
62 0, /* dst_mask */
63 FALSE), /* pcrel_offset */
64
65 /* An PC Relative 10-bit relocation, shifted by 2 */
66 /* right container */
67 HOWTO (R_D10V_10_PCREL_R, /* type */
68 2, /* rightshift */
69 2, /* size (0 = byte, 1 = short, 2 = long) */
70 7, /* bitsize */
71 TRUE, /* pc_relative */
72 0, /* bitpos */
73 complain_overflow_bitfield, /* complain_on_overflow */
74 bfd_elf_generic_reloc, /* special_function */
75 "R_D10V_10_PCREL_R", /* name */
76 FALSE, /* partial_inplace */
77 0xff, /* src_mask */
78 0xff, /* dst_mask */
79 TRUE), /* pcrel_offset */
80
81 /* An PC Relative 10-bit relocation, shifted by 2 */
82 /* left container */
83 HOWTO (R_D10V_10_PCREL_L, /* type */
84 2, /* rightshift */
85 2, /* size (0 = byte, 1 = short, 2 = long) */
86 7, /* bitsize */
87 TRUE, /* pc_relative */
88 15, /* bitpos */
89 complain_overflow_bitfield, /* complain_on_overflow */
90 bfd_elf_generic_reloc, /* special_function */
91 "R_D10V_10_PCREL_L", /* name */
92 FALSE, /* partial_inplace */
93 0x07f8000, /* src_mask */
94 0x07f8000, /* dst_mask */
95 TRUE), /* pcrel_offset */
96
97 /* A 16 bit absolute relocation */
98 HOWTO (R_D10V_16, /* type */
99 0, /* rightshift */
100 1, /* size (0 = byte, 1 = short, 2 = long) */
101 16, /* bitsize */
102 FALSE, /* pc_relative */
103 0, /* bitpos */
104 complain_overflow_dont, /* complain_on_overflow */
105 bfd_elf_generic_reloc, /* special_function */
106 "R_D10V_16", /* name */
107 FALSE, /* partial_inplace */
108 0xffff, /* src_mask */
109 0xffff, /* dst_mask */
110 FALSE), /* pcrel_offset */
111
112 /* An 18 bit absolute relocation, right shifted 2 */
113 HOWTO (R_D10V_18, /* type */
114 2, /* rightshift */
115 1, /* size (0 = byte, 1 = short, 2 = long) */
116 16, /* bitsize */
117 FALSE, /* pc_relative */
118 0, /* bitpos */
119 complain_overflow_dont, /* complain_on_overflow */
120 bfd_elf_generic_reloc, /* special_function */
121 "R_D10V_18", /* name */
122 FALSE, /* partial_inplace */
123 0xffff, /* src_mask */
124 0xffff, /* dst_mask */
125 FALSE), /* pcrel_offset */
126
127 /* A relative 18 bit relocation, right shifted by 2 */
128 HOWTO (R_D10V_18_PCREL, /* type */
129 2, /* rightshift */
130 2, /* size (0 = byte, 1 = short, 2 = long) */
131 15, /* bitsize */
132 TRUE, /* pc_relative */
133 0, /* bitpos */
134 complain_overflow_bitfield, /* complain_on_overflow */
135 bfd_elf_generic_reloc, /* special_function */
136 "R_D10V_18_PCREL", /* name */
137 FALSE, /* partial_inplace */
138 0xffff, /* src_mask */
139 0xffff, /* dst_mask */
140 TRUE), /* pcrel_offset */
141
142 /* A 32 bit absolute relocation */
143 HOWTO (R_D10V_32, /* type */
144 0, /* rightshift */
145 2, /* size (0 = byte, 1 = short, 2 = long) */
146 32, /* bitsize */
147 FALSE, /* pc_relative */
148 0, /* bitpos */
149 complain_overflow_dont, /* complain_on_overflow */
150 bfd_elf_generic_reloc, /* special_function */
151 "R_D10V_32", /* name */
152 FALSE, /* partial_inplace */
153 0xffffffff, /* src_mask */
154 0xffffffff, /* dst_mask */
155 FALSE), /* pcrel_offset */
156
157 /* GNU extension to record C++ vtable hierarchy */
158 HOWTO (R_D10V_GNU_VTINHERIT, /* type */
159 0, /* rightshift */
160 2, /* size (0 = byte, 1 = short, 2 = long) */
161 0, /* bitsize */
162 FALSE, /* pc_relative */
163 0, /* bitpos */
164 complain_overflow_dont, /* complain_on_overflow */
165 NULL, /* special_function */
166 "R_D10V_GNU_VTINHERIT", /* name */
167 FALSE, /* partial_inplace */
168 0, /* src_mask */
169 0, /* dst_mask */
170 FALSE), /* pcrel_offset */
171
172 /* GNU extension to record C++ vtable member usage */
173 HOWTO (R_D10V_GNU_VTENTRY, /* type */
174 0, /* rightshift */
175 2, /* size (0 = byte, 1 = short, 2 = long) */
176 0, /* bitsize */
177 FALSE, /* pc_relative */
178 0, /* bitpos */
179 complain_overflow_dont, /* complain_on_overflow */
180 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
181 "R_D10V_GNU_VTENTRY", /* name */
182 FALSE, /* partial_inplace */
183 0, /* src_mask */
184 0, /* dst_mask */
185 FALSE), /* pcrel_offset */
186 };
187
188/* Map BFD reloc types to D10V ELF reloc types. */
189
190struct d10v_reloc_map
191 {
192 bfd_reloc_code_real_type bfd_reloc_val;
193 unsigned char elf_reloc_val;
194 };
195
196static const struct d10v_reloc_map d10v_reloc_map[] =
197 {
198 { BFD_RELOC_NONE, R_D10V_NONE, },
199 { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R },
200 { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L },
201 { BFD_RELOC_16, R_D10V_16 },
202 { BFD_RELOC_D10V_18, R_D10V_18 },
203 { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL },
204 { BFD_RELOC_32, R_D10V_32 },
205 { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT },
206 { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY },
207 };
208
209static reloc_howto_type *
210bfd_elf32_bfd_reloc_type_lookup (abfd, code)
211 bfd *abfd ATTRIBUTE_UNUSED;
212 bfd_reloc_code_real_type code;
213{
214 unsigned int i;
215
216 for (i = 0;
217 i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map);
218 i++)
219 {
220 if (d10v_reloc_map[i].bfd_reloc_val == code)
221 return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val];
222 }
223
224 return NULL;
225}
226
227/* Set the howto pointer for an D10V ELF reloc. */
228
229static void
230d10v_info_to_howto_rel (abfd, cache_ptr, dst)
231 bfd *abfd ATTRIBUTE_UNUSED;
232 arelent *cache_ptr;
233 Elf_Internal_Rela *dst;
234{
235 unsigned int r_type;
236
237 r_type = ELF32_R_TYPE (dst->r_info);
238 BFD_ASSERT (r_type < (unsigned int) R_D10V_max);
239 cache_ptr->howto = &elf_d10v_howto_table[r_type];
240}
241
242static asection *
243elf32_d10v_gc_mark_hook (sec, info, rel, h, sym)
244 asection *sec;
245 struct bfd_link_info *info ATTRIBUTE_UNUSED;
246 Elf_Internal_Rela *rel;
247 struct elf_link_hash_entry *h;
248 Elf_Internal_Sym *sym;
249{
250 if (h != NULL)
251 {
252 switch (ELF32_R_TYPE (rel->r_info))
253 {
254 case R_D10V_GNU_VTINHERIT:
255 case R_D10V_GNU_VTENTRY:
256 break;
257
258 default:
259 switch (h->root.type)
260 {
261 case bfd_link_hash_defined:
262 case bfd_link_hash_defweak:
263 return h->root.u.def.section;
264
265 case bfd_link_hash_common:
266 return h->root.u.c.p->section;
267
268 default:
269 break;
270 }
271 }
272 }
273 else
274 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
275
276 return NULL;
277}
278
279static bfd_boolean
280elf32_d10v_gc_sweep_hook (abfd, info, sec, relocs)
281 bfd *abfd ATTRIBUTE_UNUSED;
282 struct bfd_link_info *info ATTRIBUTE_UNUSED;
283 asection *sec ATTRIBUTE_UNUSED;
284 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
285{
286 /* we don't use got and plt entries for d10v */
287 return TRUE;
288}
289
290/* Look through the relocs for a section during the first phase.
291 Since we don't do .gots or .plts, we just need to consider the
292 virtual table relocs for gc. */
293
294static bfd_boolean
295elf32_d10v_check_relocs (abfd, info, sec, relocs)
296 bfd *abfd;
297 struct bfd_link_info *info;
298 asection *sec;
299 const Elf_Internal_Rela *relocs;
300{
301 Elf_Internal_Shdr *symtab_hdr;
302 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
303 const Elf_Internal_Rela *rel;
304 const Elf_Internal_Rela *rel_end;
305
306 if (info->relocateable)
307 return TRUE;
308
309 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
310 sym_hashes = elf_sym_hashes (abfd);
311 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
312 if (!elf_bad_symtab (abfd))
313 sym_hashes_end -= symtab_hdr->sh_info;
314
315 rel_end = relocs + sec->reloc_count;
316 for (rel = relocs; rel < rel_end; rel++)
317 {
318 struct elf_link_hash_entry *h;
319 unsigned long r_symndx;
320
321 r_symndx = ELF32_R_SYM (rel->r_info);
322 if (r_symndx < symtab_hdr->sh_info)
323 h = NULL;
324 else
325 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
326
327 switch (ELF32_R_TYPE (rel->r_info))
328 {
329 /* This relocation describes the C++ object vtable hierarchy.
330 Reconstruct it for later use during GC. */
331 case R_D10V_GNU_VTINHERIT:
332 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
333 return FALSE;
334 break;
335
336 /* This relocation describes which C++ vtable entries are actually
337 used. Record for later use during GC. */
338 case R_D10V_GNU_VTENTRY:
339 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
340 return FALSE;
341 break;
342 }
343 }
344
345 return TRUE;
346}
347
348/* Relocate a D10V ELF section. */
349static bfd_boolean
350elf32_d10v_relocate_section (output_bfd, info, input_bfd, input_section,
351 contents, relocs, local_syms, local_sections)
352 bfd *output_bfd;
353 struct bfd_link_info *info;
354 bfd *input_bfd;
355 asection *input_section;
356 bfd_byte *contents;
357 Elf_Internal_Rela *relocs;
358 Elf_Internal_Sym *local_syms;
359 asection **local_sections;
360{
361 Elf_Internal_Shdr *symtab_hdr;
362 struct elf_link_hash_entry **sym_hashes;
363 Elf_Internal_Rela *rel, *relend;
364 const char *name;
365
366 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
367 sym_hashes = elf_sym_hashes (input_bfd);
368
369 rel = relocs;
370 relend = relocs + input_section->reloc_count;
371 for (; rel < relend; rel++)
372 {
373 int r_type;
374 reloc_howto_type *howto;
375 unsigned long r_symndx;
376 Elf_Internal_Sym *sym;
377 asection *sec;
378 struct elf_link_hash_entry *h;
379 bfd_vma relocation;
380 bfd_reloc_status_type r;
381
382 r_symndx = ELF32_R_SYM (rel->r_info);
383 r_type = ELF32_R_TYPE (rel->r_info);
384
385 if (r_type == R_D10V_GNU_VTENTRY
386 || r_type == R_D10V_GNU_VTINHERIT )
387 continue;
388
389 howto = elf_d10v_howto_table + r_type;
390
391 if (info->relocateable)
392 {
393 /* This is a relocateable link. We don't have to change
394 anything, unless the reloc is against a section symbol,
395 in which case we have to adjust according to where the
396 section symbol winds up in the output section. */
397 if (r_symndx < symtab_hdr->sh_info)
398 {
399 sym = local_syms + r_symndx;
400 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
401 {
402 sec = local_sections[r_symndx];
403 rel->r_addend += sec->output_offset + sym->st_value;
404 }
405 }
406
407 continue;
408 }
409
410 /* This is a final link. */
411 h = NULL;
412 sym = NULL;
413 sec = NULL;
414 if (r_symndx < symtab_hdr->sh_info)
415 {
416 sym = local_syms + r_symndx;
417 sec = local_sections[r_symndx];
418 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
419 }
420 else
421 {
422 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
423 while (h->root.type == bfd_link_hash_indirect
424 || h->root.type == bfd_link_hash_warning)
425 h = (struct elf_link_hash_entry *) h->root.u.i.link;
426 if (h->root.type == bfd_link_hash_defined
427 || h->root.type == bfd_link_hash_defweak)
428 {
429 sec = h->root.u.def.section;
430 relocation = (h->root.u.def.value
431 + sec->output_section->vma
432 + sec->output_offset);
433 }
434 else if (h->root.type == bfd_link_hash_undefweak)
435 relocation = 0;
436 else
437 {
438 if (!((*info->callbacks->undefined_symbol)
439 (info, h->root.root.string, input_bfd,
440 input_section, rel->r_offset, TRUE)))
441 return FALSE;
442 relocation = 0;
443 }
444 }
445
446 if (h != NULL)
447 name = h->root.root.string;
448 else
449 {
450 name = (bfd_elf_string_from_elf_section
451 (input_bfd, symtab_hdr->sh_link, sym->st_name));
452 if (name == NULL || *name == '\0')
453 name = bfd_section_name (input_bfd, sec);
454 }
455
456 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
457 contents, rel->r_offset,
458 relocation, rel->r_addend);
459
460 if (r != bfd_reloc_ok)
461 {
462 const char * msg = (const char *) 0;
463
464 switch (r)
465 {
466 case bfd_reloc_overflow:
467 if (!((*info->callbacks->reloc_overflow)
468 (info, name, howto->name, (bfd_vma) 0,
469 input_bfd, input_section, rel->r_offset)))
470 return FALSE;
471 break;
472
473 case bfd_reloc_undefined:
474 if (!((*info->callbacks->undefined_symbol)
475 (info, name, input_bfd, input_section,
476 rel->r_offset, TRUE)))
477 return FALSE;
478 break;
479
480 case bfd_reloc_outofrange:
481 msg = _("internal error: out of range error");
482 goto common_error;
483
484 case bfd_reloc_notsupported:
485 msg = _("internal error: unsupported relocation error");
486 goto common_error;
487
488 case bfd_reloc_dangerous:
489 msg = _("internal error: dangerous error");
490 goto common_error;
491
492 default:
493 msg = _("internal error: unknown error");
494 /* fall through */
495
496 common_error:
497 if (!((*info->callbacks->warning)
498 (info, msg, name, input_bfd, input_section,
499 rel->r_offset)))
500 return FALSE;
501 break;
502 }
503 }
504 }
505
506 return TRUE;
507}
508#define ELF_ARCH bfd_arch_d10v
509#define ELF_MACHINE_CODE EM_D10V
510#define ELF_MACHINE_ALT1 EM_CYGNUS_D10V
511#define ELF_MAXPAGESIZE 0x1000
512
513#define TARGET_BIG_SYM bfd_elf32_d10v_vec
514#define TARGET_BIG_NAME "elf32-d10v"
515
516#define elf_info_to_howto 0
517#define elf_info_to_howto_rel d10v_info_to_howto_rel
518#define elf_backend_object_p 0
519#define elf_backend_final_write_processing 0
520#define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
521#define elf_backend_gc_sweep_hook elf32_d10v_gc_sweep_hook
522#define elf_backend_check_relocs elf32_d10v_check_relocs
523#define elf_backend_relocate_section elf32_d10v_relocate_section
524#define elf_backend_can_gc_sections 1
525
526#include "elf32-target.h"
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