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2005-09-08 Paul Brook <paul@codesourcery.com>
[binutils.git] / bfd / elf32-fr30.c
blobe17207960875739687a7f04ada7c760d61c2edf8
1 /* FR30-specific support for 32-bit ELF.
2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
3 Free Software Foundation, Inc.
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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "libbfd.h"
24 #include "elf-bfd.h"
25 #include "elf/fr30.h"
26
27 /* Forward declarations. */
28 static bfd_reloc_status_type fr30_elf_i20_reloc
29 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
30 static bfd_reloc_status_type fr30_elf_i32_reloc
31 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
32 static reloc_howto_type * fr30_reloc_type_lookup
33 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
34 static void fr30_info_to_howto_rela
35 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
36 static bfd_boolean fr30_elf_relocate_section
37 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
38 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
39 static bfd_reloc_status_type fr30_final_link_relocate
40 PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
41 Elf_Internal_Rela *, bfd_vma));
42 static bfd_boolean fr30_elf_gc_sweep_hook
43 PARAMS ((bfd *, struct bfd_link_info *, asection *,
44 const Elf_Internal_Rela *));
45 static asection * fr30_elf_gc_mark_hook
46 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
47 struct elf_link_hash_entry *, Elf_Internal_Sym *));
48 static bfd_boolean fr30_elf_check_relocs
49 PARAMS ((bfd *, struct bfd_link_info *, asection *,
50 const Elf_Internal_Rela *));
51
52 static reloc_howto_type fr30_elf_howto_table [] =
53 {
54 /* This reloc does nothing. */
55 HOWTO (R_FR30_NONE, /* type */
56 0, /* rightshift */
57 2, /* size (0 = byte, 1 = short, 2 = long) */
58 32, /* bitsize */
59 FALSE, /* pc_relative */
60 0, /* bitpos */
61 complain_overflow_bitfield, /* complain_on_overflow */
62 bfd_elf_generic_reloc, /* special_function */
63 "R_FR30_NONE", /* name */
64 FALSE, /* partial_inplace */
65 0, /* src_mask */
66 0, /* dst_mask */
67 FALSE), /* pcrel_offset */
68
69 /* An 8 bit absolute relocation. */
70 HOWTO (R_FR30_8, /* type */
71 0, /* rightshift */
72 1, /* size (0 = byte, 1 = short, 2 = long) */
73 8, /* bitsize */
74 FALSE, /* pc_relative */
75 4, /* bitpos */
76 complain_overflow_bitfield, /* complain_on_overflow */
77 bfd_elf_generic_reloc, /* special_function */
78 "R_FR30_8", /* name */
79 TRUE, /* partial_inplace */
80 0x0000, /* src_mask */
81 0x0ff0, /* dst_mask */
82 FALSE), /* pcrel_offset */
83
84 /* A 20 bit absolute relocation. */
85 HOWTO (R_FR30_20, /* type */
86 0, /* rightshift */
87 2, /* size (0 = byte, 1 = short, 2 = long) */
88 20, /* bitsize */
89 FALSE, /* pc_relative */
90 0, /* bitpos */
91 complain_overflow_bitfield, /* complain_on_overflow */
92 fr30_elf_i20_reloc, /* special_function */
93 "R_FR30_20", /* name */
94 TRUE, /* partial_inplace */
95 0x00000000, /* src_mask */
96 0x00f0ffff, /* dst_mask */
97 FALSE), /* pcrel_offset */
98
99 /* A 32 bit absolute relocation. */
100 HOWTO (R_FR30_32, /* type */
101 0, /* rightshift */
102 2, /* size (0 = byte, 1 = short, 2 = long) */
103 32, /* bitsize */
104 FALSE, /* pc_relative */
105 0, /* bitpos */
106 complain_overflow_bitfield, /* complain_on_overflow */
107 bfd_elf_generic_reloc, /* special_function */
108 "R_FR30_32", /* name */
109 TRUE, /* partial_inplace */
110 0x00000000, /* src_mask */
111 0xffffffff, /* dst_mask */
112 FALSE), /* pcrel_offset */
113
114 /* A 32 bit into 48 bits absolute relocation. */
115 HOWTO (R_FR30_48, /* type */
116 0, /* rightshift */
117 2, /* size (0 = byte, 1 = short, 2 = long) */
118 32, /* bitsize */
119 FALSE, /* pc_relative */
120 0, /* bitpos */
121 complain_overflow_bitfield, /* complain_on_overflow */
122 fr30_elf_i32_reloc, /* special_function */
123 "R_FR30_48", /* name */
124 TRUE, /* partial_inplace */
125 0x00000000, /* src_mask */
126 0xffffffff, /* dst_mask */
127 FALSE), /* pcrel_offset */
128
129 /* A 6 bit absolute relocation. */
130 HOWTO (R_FR30_6_IN_4, /* type */
131 2, /* rightshift */
132 1, /* size (0 = byte, 1 = short, 2 = long) */
133 6, /* bitsize */
134 FALSE, /* pc_relative */
135 4, /* bitpos */
136 complain_overflow_unsigned, /* complain_on_overflow */
137 bfd_elf_generic_reloc, /* special_function */
138 "R_FR30_6_IN_4", /* name */
139 TRUE, /* partial_inplace */
140 0x0000, /* src_mask */
141 0x00f0, /* dst_mask */
142 FALSE), /* pcrel_offset */
143
144 /* An 8 bit absolute relocation. */
145 HOWTO (R_FR30_8_IN_8, /* type */
146 0, /* rightshift */
147 1, /* size (0 = byte, 1 = short, 2 = long) */
148 8, /* bitsize */
149 FALSE, /* pc_relative */
150 4, /* bitpos */
151 complain_overflow_signed, /* complain_on_overflow */
152 bfd_elf_generic_reloc,/* special_function */
153 "R_FR30_8_IN_8", /* name */
154 TRUE, /* partial_inplace */
155 0x0000, /* src_mask */
156 0x0ff0, /* dst_mask */
157 FALSE), /* pcrel_offset */
158
159 /* A 9 bit absolute relocation. */
160 HOWTO (R_FR30_9_IN_8, /* type */
161 1, /* rightshift */
162 1, /* size (0 = byte, 1 = short, 2 = long) */
163 9, /* bitsize */
164 FALSE, /* pc_relative */
165 4, /* bitpos */
166 complain_overflow_signed, /* complain_on_overflow */
167 bfd_elf_generic_reloc,/* special_function */
168 "R_FR30_9_IN_8", /* name */
169 TRUE, /* partial_inplace */
170 0x0000, /* src_mask */
171 0x0ff0, /* dst_mask */
172 FALSE), /* pcrel_offset */
173
174 /* A 10 bit absolute relocation. */
175 HOWTO (R_FR30_10_IN_8, /* type */
176 2, /* rightshift */
177 1, /* size (0 = byte, 1 = short, 2 = long) */
178 10, /* bitsize */
179 FALSE, /* pc_relative */
180 4, /* bitpos */
181 complain_overflow_signed, /* complain_on_overflow */
182 bfd_elf_generic_reloc,/* special_function */
183 "R_FR30_10_IN_8", /* name */
184 TRUE, /* partial_inplace */
185 0x0000, /* src_mask */
186 0x0ff0, /* dst_mask */
187 FALSE), /* pcrel_offset */
188
189 /* A PC relative 9 bit relocation, right shifted by 1. */
190 HOWTO (R_FR30_9_PCREL, /* type */
191 1, /* rightshift */
192 1, /* size (0 = byte, 1 = short, 2 = long) */
193 9, /* bitsize */
194 TRUE, /* pc_relative */
195 0, /* bitpos */
196 complain_overflow_signed, /* complain_on_overflow */
197 bfd_elf_generic_reloc, /* special_function */
198 "R_FR30_9_PCREL", /* name */
199 FALSE, /* partial_inplace */
200 0x0000, /* src_mask */
201 0x00ff, /* dst_mask */
202 FALSE), /* pcrel_offset */
203
204 /* A PC relative 12 bit relocation, right shifted by 1. */
205 HOWTO (R_FR30_12_PCREL, /* type */
206 1, /* rightshift */
207 1, /* size (0 = byte, 1 = short, 2 = long) */
208 12, /* bitsize */
209 TRUE, /* pc_relative */
210 0, /* bitpos */
211 complain_overflow_signed, /* complain_on_overflow */
212 bfd_elf_generic_reloc, /* special_function */
213 "R_FR30_12_PCREL", /* name */
214 FALSE, /* partial_inplace */
215 0x0000, /* src_mask */
216 0x07ff, /* dst_mask */
217 FALSE), /* pcrel_offset */
218 /* GNU extension to record C++ vtable hierarchy */
219 HOWTO (R_FR30_GNU_VTINHERIT, /* type */
220 0, /* rightshift */
221 2, /* size (0 = byte, 1 = short, 2 = long) */
222 0, /* bitsize */
223 FALSE, /* pc_relative */
224 0, /* bitpos */
225 complain_overflow_dont, /* complain_on_overflow */
226 NULL, /* special_function */
227 "R_FR30_GNU_VTINHERIT", /* name */
228 FALSE, /* partial_inplace */
229 0, /* src_mask */
230 0, /* dst_mask */
231 FALSE), /* pcrel_offset */
232
233 /* GNU extension to record C++ vtable member usage */
234 HOWTO (R_FR30_GNU_VTENTRY, /* type */
235 0, /* rightshift */
236 2, /* size (0 = byte, 1 = short, 2 = long) */
237 0, /* bitsize */
238 FALSE, /* pc_relative */
239 0, /* bitpos */
240 complain_overflow_dont, /* complain_on_overflow */
241 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
242 "R_FR30_GNU_VTENTRY", /* name */
243 FALSE, /* partial_inplace */
244 0, /* src_mask */
245 0, /* dst_mask */
246 FALSE), /* pcrel_offset */
247 };
248 \f
249 /* Utility to actually perform an R_FR30_20 reloc. */
250
251 static bfd_reloc_status_type
252 fr30_elf_i20_reloc (abfd, reloc_entry, symbol, data,
253 input_section, output_bfd, error_message)
254 bfd *abfd;
255 arelent *reloc_entry;
256 asymbol *symbol;
257 PTR data;
258 asection *input_section;
259 bfd *output_bfd;
260 char **error_message ATTRIBUTE_UNUSED;
261 {
262 bfd_vma relocation;
263 unsigned long x;
264
265 /* This part is from bfd_elf_generic_reloc. */
266 if (output_bfd != (bfd *) NULL
267 && (symbol->flags & BSF_SECTION_SYM) == 0
268 && (! reloc_entry->howto->partial_inplace
269 || reloc_entry->addend == 0))
270 {
271 reloc_entry->address += input_section->output_offset;
272 return bfd_reloc_ok;
273 }
274
275 if (output_bfd != NULL)
276 /* FIXME: See bfd_perform_relocation. Is this right? */
277 return bfd_reloc_ok;
278
279 relocation =
280 symbol->value
281 + symbol->section->output_section->vma
282 + symbol->section->output_offset
283 + reloc_entry->addend;
284
285 if (relocation > (((bfd_vma) 1 << 20) - 1))
286 return bfd_reloc_overflow;
287
288 x = bfd_get_32 (abfd, (char *) data + reloc_entry->address);
289 x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4);
290 bfd_put_32 (abfd, (bfd_vma) x, (char *) data + reloc_entry->address);
291
292 return bfd_reloc_ok;
293 }
294 \f
295 /* Utility to actually perform a R_FR30_48 reloc. */
296
297 static bfd_reloc_status_type
298 fr30_elf_i32_reloc (abfd, reloc_entry, symbol, data,
299 input_section, output_bfd, error_message)
300 bfd *abfd;
301 arelent *reloc_entry;
302 asymbol *symbol;
303 PTR data;
304 asection *input_section;
305 bfd *output_bfd;
306 char **error_message ATTRIBUTE_UNUSED;
307 {
308 bfd_vma relocation;
309
310 /* This part is from bfd_elf_generic_reloc. */
311 if (output_bfd != (bfd *) NULL
312 && (symbol->flags & BSF_SECTION_SYM) == 0
313 && (! reloc_entry->howto->partial_inplace
314 || reloc_entry->addend == 0))
315 {
316 reloc_entry->address += input_section->output_offset;
317 return bfd_reloc_ok;
318 }
319
320 if (output_bfd != NULL)
321 /* FIXME: See bfd_perform_relocation. Is this right? */
322 return bfd_reloc_ok;
323
324 relocation =
325 symbol->value
326 + symbol->section->output_section->vma
327 + symbol->section->output_offset
328 + reloc_entry->addend;
329
330 bfd_put_32 (abfd, relocation, (char *) data + reloc_entry->address + 2);
331
332 return bfd_reloc_ok;
333 }
334 \f
335 /* Map BFD reloc types to FR30 ELF reloc types. */
336
337 struct fr30_reloc_map
338 {
339 bfd_reloc_code_real_type bfd_reloc_val;
340 unsigned int fr30_reloc_val;
341 };
342
343 static const struct fr30_reloc_map fr30_reloc_map [] =
344 {
345 { BFD_RELOC_NONE, R_FR30_NONE },
346 { BFD_RELOC_8, R_FR30_8 },
347 { BFD_RELOC_FR30_20, R_FR30_20 },
348 { BFD_RELOC_32, R_FR30_32 },
349 { BFD_RELOC_FR30_48, R_FR30_48 },
350 { BFD_RELOC_FR30_6_IN_4, R_FR30_6_IN_4 },
351 { BFD_RELOC_FR30_8_IN_8, R_FR30_8_IN_8 },
352 { BFD_RELOC_FR30_9_IN_8, R_FR30_9_IN_8 },
353 { BFD_RELOC_FR30_10_IN_8, R_FR30_10_IN_8 },
354 { BFD_RELOC_FR30_9_PCREL, R_FR30_9_PCREL },
355 { BFD_RELOC_FR30_12_PCREL, R_FR30_12_PCREL },
356 { BFD_RELOC_VTABLE_INHERIT, R_FR30_GNU_VTINHERIT },
357 { BFD_RELOC_VTABLE_ENTRY, R_FR30_GNU_VTENTRY },
358 };
359
360 static reloc_howto_type *
361 fr30_reloc_type_lookup (abfd, code)
362 bfd *abfd ATTRIBUTE_UNUSED;
363 bfd_reloc_code_real_type code;
364 {
365 unsigned int i;
366
367 for (i = sizeof (fr30_reloc_map) / sizeof (fr30_reloc_map[0]);
368 --i;)
369 if (fr30_reloc_map [i].bfd_reloc_val == code)
370 return & fr30_elf_howto_table [fr30_reloc_map[i].fr30_reloc_val];
371
372 return NULL;
373 }
374
375 /* Set the howto pointer for an FR30 ELF reloc. */
376
377 static void
378 fr30_info_to_howto_rela (abfd, cache_ptr, dst)
379 bfd *abfd ATTRIBUTE_UNUSED;
380 arelent *cache_ptr;
381 Elf_Internal_Rela *dst;
382 {
383 unsigned int r_type;
384
385 r_type = ELF32_R_TYPE (dst->r_info);
386 BFD_ASSERT (r_type < (unsigned int) R_FR30_max);
387 cache_ptr->howto = & fr30_elf_howto_table [r_type];
388 }
389 \f
390 /* Perform a single relocation. By default we use the standard BFD
391 routines, but a few relocs, we have to do them ourselves. */
392
393 static bfd_reloc_status_type
394 fr30_final_link_relocate (howto, input_bfd, input_section, contents, rel,
395 relocation)
396 reloc_howto_type *howto;
397 bfd *input_bfd;
398 asection *input_section;
399 bfd_byte *contents;
400 Elf_Internal_Rela *rel;
401 bfd_vma relocation;
402 {
403 bfd_reloc_status_type r = bfd_reloc_ok;
404 bfd_vma x;
405 bfd_signed_vma srel;
406
407 switch (howto->type)
408 {
409 case R_FR30_20:
410 contents += rel->r_offset;
411 relocation += rel->r_addend;
412
413 if (relocation > ((1 << 20) - 1))
414 return bfd_reloc_overflow;
415
416 x = bfd_get_32 (input_bfd, contents);
417 x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4);
418 bfd_put_32 (input_bfd, x, contents);
419 break;
420
421 case R_FR30_48:
422 contents += rel->r_offset + 2;
423 relocation += rel->r_addend;
424 bfd_put_32 (input_bfd, relocation, contents);
425 break;
426
427 case R_FR30_9_PCREL:
428 contents += rel->r_offset + 1;
429 srel = (bfd_signed_vma) relocation;
430 srel += rel->r_addend;
431 srel -= rel->r_offset;
432 srel -= 2; /* Branch instructions add 2 to the PC... */
433 srel -= (input_section->output_section->vma +
434 input_section->output_offset);
435
436 if (srel & 1)
437 return bfd_reloc_outofrange;
438 if (srel > ((1 << 8) - 1) || (srel < - (1 << 8)))
439 return bfd_reloc_overflow;
440
441 bfd_put_8 (input_bfd, srel >> 1, contents);
442 break;
443
444 case R_FR30_12_PCREL:
445 contents += rel->r_offset;
446 srel = (bfd_signed_vma) relocation;
447 srel += rel->r_addend;
448 srel -= rel->r_offset;
449 srel -= 2; /* Branch instructions add 2 to the PC... */
450 srel -= (input_section->output_section->vma +
451 input_section->output_offset);
452
453 if (srel & 1)
454 return bfd_reloc_outofrange;
455 if (srel > ((1 << 11) - 1) || (srel < - (1 << 11)))
456 return bfd_reloc_overflow;
457
458 x = bfd_get_16 (input_bfd, contents);
459 x = (x & 0xf800) | ((srel >> 1) & 0x7ff);
460 bfd_put_16 (input_bfd, x, contents);
461 break;
462
463 default:
464 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
465 contents, rel->r_offset,
466 relocation, rel->r_addend);
467 }
468
469 return r;
470 }
471 \f
472 /* Relocate an FR30 ELF section.
473
474 The RELOCATE_SECTION function is called by the new ELF backend linker
475 to handle the relocations for a section.
476
477 The relocs are always passed as Rela structures; if the section
478 actually uses Rel structures, the r_addend field will always be
479 zero.
480
481 This function is responsible for adjusting the section contents as
482 necessary, and (if using Rela relocs and generating a relocatable
483 output file) adjusting the reloc addend as necessary.
484
485 This function does not have to worry about setting the reloc
486 address or the reloc symbol index.
487
488 LOCAL_SYMS is a pointer to the swapped in local symbols.
489
490 LOCAL_SECTIONS is an array giving the section in the input file
491 corresponding to the st_shndx field of each local symbol.
492
493 The global hash table entry for the global symbols can be found
494 via elf_sym_hashes (input_bfd).
495
496 When generating relocatable output, this function must handle
497 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
498 going to be the section symbol corresponding to the output
499 section, which means that the addend must be adjusted
500 accordingly. */
501
502 static bfd_boolean
503 fr30_elf_relocate_section (output_bfd, info, input_bfd, input_section,
504 contents, relocs, local_syms, local_sections)
505 bfd *output_bfd;
506 struct bfd_link_info *info;
507 bfd *input_bfd;
508 asection *input_section;
509 bfd_byte *contents;
510 Elf_Internal_Rela *relocs;
511 Elf_Internal_Sym *local_syms;
512 asection **local_sections;
513 {
514 Elf_Internal_Shdr *symtab_hdr;
515 struct elf_link_hash_entry **sym_hashes;
516 Elf_Internal_Rela *rel;
517 Elf_Internal_Rela *relend;
518
519 if (info->relocatable)
520 return TRUE;
521
522 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
523 sym_hashes = elf_sym_hashes (input_bfd);
524 relend = relocs + input_section->reloc_count;
525
526 for (rel = relocs; rel < relend; rel ++)
527 {
528 reloc_howto_type *howto;
529 unsigned long r_symndx;
530 Elf_Internal_Sym *sym;
531 asection *sec;
532 struct elf_link_hash_entry *h;
533 bfd_vma relocation;
534 bfd_reloc_status_type r;
535 const char *name;
536 int r_type;
537
538 r_type = ELF32_R_TYPE (rel->r_info);
539
540 if ( r_type == R_FR30_GNU_VTINHERIT
541 || r_type == R_FR30_GNU_VTENTRY)
542 continue;
543
544 r_symndx = ELF32_R_SYM (rel->r_info);
545
546 howto = fr30_elf_howto_table + ELF32_R_TYPE (rel->r_info);
547 h = NULL;
548 sym = NULL;
549 sec = NULL;
550
551 if (r_symndx < symtab_hdr->sh_info)
552 {
553 sym = local_syms + r_symndx;
554 sec = local_sections [r_symndx];
555 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
556
557 name = bfd_elf_string_from_elf_section
558 (input_bfd, symtab_hdr->sh_link, sym->st_name);
559 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
560 }
561 else
562 {
563 bfd_boolean unresolved_reloc, warned;
564
565 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
566 r_symndx, symtab_hdr, sym_hashes,
567 h, sec, relocation,
568 unresolved_reloc, warned);
569
570 name = h->root.root.string;
571 }
572
573 r = fr30_final_link_relocate (howto, input_bfd, input_section,
574 contents, rel, relocation);
575
576 if (r != bfd_reloc_ok)
577 {
578 const char * msg = (const char *) NULL;
579
580 switch (r)
581 {
582 case bfd_reloc_overflow:
583 r = info->callbacks->reloc_overflow
584 (info, (h ? &h->root : NULL), name, howto->name,
585 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
586 break;
587
588 case bfd_reloc_undefined:
589 r = info->callbacks->undefined_symbol
590 (info, name, input_bfd, input_section, rel->r_offset,
591 TRUE);
592 break;
593
594 case bfd_reloc_outofrange:
595 msg = _("internal error: out of range error");
596 break;
597
598 case bfd_reloc_notsupported:
599 msg = _("internal error: unsupported relocation error");
600 break;
601
602 case bfd_reloc_dangerous:
603 msg = _("internal error: dangerous relocation");
604 break;
605
606 default:
607 msg = _("internal error: unknown error");
608 break;
609 }
610
611 if (msg)
612 r = info->callbacks->warning
613 (info, msg, name, input_bfd, input_section, rel->r_offset);
614
615 if (! r)
616 return FALSE;
617 }
618 }
619
620 return TRUE;
621 }
622 \f
623 /* Return the section that should be marked against GC for a given
624 relocation. */
625
626 static asection *
627 fr30_elf_gc_mark_hook (sec, info, rel, h, sym)
628 asection *sec;
629 struct bfd_link_info *info ATTRIBUTE_UNUSED;
630 Elf_Internal_Rela *rel;
631 struct elf_link_hash_entry *h;
632 Elf_Internal_Sym * sym;
633 {
634 if (h != NULL)
635 {
636 switch (ELF32_R_TYPE (rel->r_info))
637 {
638 case R_FR30_GNU_VTINHERIT:
639 case R_FR30_GNU_VTENTRY:
640 break;
641
642 default:
643 switch (h->root.type)
644 {
645 case bfd_link_hash_defined:
646 case bfd_link_hash_defweak:
647 return h->root.u.def.section;
648
649 case bfd_link_hash_common:
650 return h->root.u.c.p->section;
651
652 default:
653 break;
654 }
655 }
656 }
657 else
658 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
659
660 return NULL;
661 }
662
663 /* Update the got entry reference counts for the section being removed. */
664
665 static bfd_boolean
666 fr30_elf_gc_sweep_hook (abfd, info, sec, relocs)
667 bfd *abfd ATTRIBUTE_UNUSED;
668 struct bfd_link_info *info ATTRIBUTE_UNUSED;
669 asection *sec ATTRIBUTE_UNUSED;
670 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
671 {
672 return TRUE;
673 }
674
675 /* Look through the relocs for a section during the first phase.
676 Since we don't do .gots or .plts, we just need to consider the
677 virtual table relocs for gc. */
678
679 static bfd_boolean
680 fr30_elf_check_relocs (abfd, info, sec, relocs)
681 bfd *abfd;
682 struct bfd_link_info *info;
683 asection *sec;
684 const Elf_Internal_Rela *relocs;
685 {
686 Elf_Internal_Shdr *symtab_hdr;
687 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
688 const Elf_Internal_Rela *rel;
689 const Elf_Internal_Rela *rel_end;
690
691 if (info->relocatable)
692 return TRUE;
693
694 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
695 sym_hashes = elf_sym_hashes (abfd);
696 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
697 if (!elf_bad_symtab (abfd))
698 sym_hashes_end -= symtab_hdr->sh_info;
699
700 rel_end = relocs + sec->reloc_count;
701 for (rel = relocs; rel < rel_end; rel++)
702 {
703 struct elf_link_hash_entry *h;
704 unsigned long r_symndx;
705
706 r_symndx = ELF32_R_SYM (rel->r_info);
707 if (r_symndx < symtab_hdr->sh_info)
708 h = NULL;
709 else
710 {
711 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
712 while (h->root.type == bfd_link_hash_indirect
713 || h->root.type == bfd_link_hash_warning)
714 h = (struct elf_link_hash_entry *) h->root.u.i.link;
715 }
716
717 switch (ELF32_R_TYPE (rel->r_info))
718 {
719 /* This relocation describes the C++ object vtable hierarchy.
720 Reconstruct it for later use during GC. */
721 case R_FR30_GNU_VTINHERIT:
722 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
723 return FALSE;
724 break;
725
726 /* This relocation describes which C++ vtable entries are actually
727 used. Record for later use during GC. */
728 case R_FR30_GNU_VTENTRY:
729 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
730 return FALSE;
731 break;
732 }
733 }
734
735 return TRUE;
736 }
737 \f
738 #define ELF_ARCH bfd_arch_fr30
739 #define ELF_MACHINE_CODE EM_FR30
740 #define ELF_MACHINE_ALT1 EM_CYGNUS_FR30
741 #define ELF_MAXPAGESIZE 0x1000
742
743 #define TARGET_BIG_SYM bfd_elf32_fr30_vec
744 #define TARGET_BIG_NAME "elf32-fr30"
745
746 #define elf_info_to_howto_rel NULL
747 #define elf_info_to_howto fr30_info_to_howto_rela
748 #define elf_backend_relocate_section fr30_elf_relocate_section
749 #define elf_backend_gc_mark_hook fr30_elf_gc_mark_hook
750 #define elf_backend_gc_sweep_hook fr30_elf_gc_sweep_hook
751 #define elf_backend_check_relocs fr30_elf_check_relocs
752
753 #define elf_backend_can_gc_sections 1
754 #define elf_backend_rela_normal 1
755
756 #define bfd_elf32_bfd_reloc_type_lookup fr30_reloc_type_lookup
757
758 #include "elf32-target.h"
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