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[deliverable/binutils-gdb.git] / bfd / elf32-fr30.c
1 /* FR30-specific support for 32-bit ELF.
2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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 3 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,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/fr30.h"
27
28 /* Forward declarations. */
29 static bfd_reloc_status_type fr30_elf_i20_reloc
30 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
31 static bfd_reloc_status_type fr30_elf_i32_reloc
32 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
33 static reloc_howto_type * fr30_reloc_type_lookup
34 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
35 static void fr30_info_to_howto_rela
36 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
37 static bfd_boolean fr30_elf_relocate_section
38 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
39 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
40 static bfd_reloc_status_type fr30_final_link_relocate
41 PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
42 Elf_Internal_Rela *, bfd_vma));
43 static bfd_boolean fr30_elf_check_relocs
44 PARAMS ((bfd *, struct bfd_link_info *, asection *,
45 const Elf_Internal_Rela *));
46
47 static reloc_howto_type fr30_elf_howto_table [] =
48 {
49 /* This reloc does nothing. */
50 HOWTO (R_FR30_NONE, /* type */
51 0, /* rightshift */
52 2, /* size (0 = byte, 1 = short, 2 = long) */
53 32, /* bitsize */
54 FALSE, /* pc_relative */
55 0, /* bitpos */
56 complain_overflow_bitfield, /* complain_on_overflow */
57 bfd_elf_generic_reloc, /* special_function */
58 "R_FR30_NONE", /* name */
59 FALSE, /* partial_inplace */
60 0, /* src_mask */
61 0, /* dst_mask */
62 FALSE), /* pcrel_offset */
63
64 /* An 8 bit absolute relocation. */
65 HOWTO (R_FR30_8, /* type */
66 0, /* rightshift */
67 1, /* size (0 = byte, 1 = short, 2 = long) */
68 8, /* bitsize */
69 FALSE, /* pc_relative */
70 4, /* bitpos */
71 complain_overflow_bitfield, /* complain_on_overflow */
72 bfd_elf_generic_reloc, /* special_function */
73 "R_FR30_8", /* name */
74 FALSE, /* partial_inplace */
75 0x0000, /* src_mask */
76 0x0ff0, /* dst_mask */
77 FALSE), /* pcrel_offset */
78
79 /* A 20 bit absolute relocation. */
80 HOWTO (R_FR30_20, /* type */
81 0, /* rightshift */
82 2, /* size (0 = byte, 1 = short, 2 = long) */
83 20, /* bitsize */
84 FALSE, /* pc_relative */
85 0, /* bitpos */
86 complain_overflow_bitfield, /* complain_on_overflow */
87 fr30_elf_i20_reloc, /* special_function */
88 "R_FR30_20", /* name */
89 FALSE, /* partial_inplace */
90 0x00000000, /* src_mask */
91 0x00f0ffff, /* dst_mask */
92 FALSE), /* pcrel_offset */
93
94 /* A 32 bit absolute relocation. */
95 HOWTO (R_FR30_32, /* type */
96 0, /* rightshift */
97 2, /* size (0 = byte, 1 = short, 2 = long) */
98 32, /* bitsize */
99 FALSE, /* pc_relative */
100 0, /* bitpos */
101 complain_overflow_bitfield, /* complain_on_overflow */
102 bfd_elf_generic_reloc, /* special_function */
103 "R_FR30_32", /* name */
104 FALSE, /* partial_inplace */
105 0x00000000, /* src_mask */
106 0xffffffff, /* dst_mask */
107 FALSE), /* pcrel_offset */
108
109 /* A 32 bit into 48 bits absolute relocation. */
110 HOWTO (R_FR30_48, /* type */
111 0, /* rightshift */
112 2, /* size (0 = byte, 1 = short, 2 = long) */
113 32, /* bitsize */
114 FALSE, /* pc_relative */
115 0, /* bitpos */
116 complain_overflow_bitfield, /* complain_on_overflow */
117 fr30_elf_i32_reloc, /* special_function */
118 "R_FR30_48", /* name */
119 FALSE, /* partial_inplace */
120 0x00000000, /* src_mask */
121 0xffffffff, /* dst_mask */
122 FALSE), /* pcrel_offset */
123
124 /* A 6 bit absolute relocation. */
125 HOWTO (R_FR30_6_IN_4, /* type */
126 2, /* rightshift */
127 1, /* size (0 = byte, 1 = short, 2 = long) */
128 6, /* bitsize */
129 FALSE, /* pc_relative */
130 4, /* bitpos */
131 complain_overflow_unsigned, /* complain_on_overflow */
132 bfd_elf_generic_reloc, /* special_function */
133 "R_FR30_6_IN_4", /* name */
134 FALSE, /* partial_inplace */
135 0x0000, /* src_mask */
136 0x00f0, /* dst_mask */
137 FALSE), /* pcrel_offset */
138
139 /* An 8 bit absolute relocation. */
140 HOWTO (R_FR30_8_IN_8, /* type */
141 0, /* rightshift */
142 1, /* size (0 = byte, 1 = short, 2 = long) */
143 8, /* bitsize */
144 FALSE, /* pc_relative */
145 4, /* bitpos */
146 complain_overflow_signed, /* complain_on_overflow */
147 bfd_elf_generic_reloc,/* special_function */
148 "R_FR30_8_IN_8", /* name */
149 FALSE, /* partial_inplace */
150 0x0000, /* src_mask */
151 0x0ff0, /* dst_mask */
152 FALSE), /* pcrel_offset */
153
154 /* A 9 bit absolute relocation. */
155 HOWTO (R_FR30_9_IN_8, /* type */
156 1, /* rightshift */
157 1, /* size (0 = byte, 1 = short, 2 = long) */
158 9, /* bitsize */
159 FALSE, /* pc_relative */
160 4, /* bitpos */
161 complain_overflow_signed, /* complain_on_overflow */
162 bfd_elf_generic_reloc,/* special_function */
163 "R_FR30_9_IN_8", /* name */
164 FALSE, /* partial_inplace */
165 0x0000, /* src_mask */
166 0x0ff0, /* dst_mask */
167 FALSE), /* pcrel_offset */
168
169 /* A 10 bit absolute relocation. */
170 HOWTO (R_FR30_10_IN_8, /* type */
171 2, /* rightshift */
172 1, /* size (0 = byte, 1 = short, 2 = long) */
173 10, /* bitsize */
174 FALSE, /* pc_relative */
175 4, /* bitpos */
176 complain_overflow_signed, /* complain_on_overflow */
177 bfd_elf_generic_reloc,/* special_function */
178 "R_FR30_10_IN_8", /* name */
179 FALSE, /* partial_inplace */
180 0x0000, /* src_mask */
181 0x0ff0, /* dst_mask */
182 FALSE), /* pcrel_offset */
183
184 /* A PC relative 9 bit relocation, right shifted by 1. */
185 HOWTO (R_FR30_9_PCREL, /* type */
186 1, /* rightshift */
187 1, /* size (0 = byte, 1 = short, 2 = long) */
188 9, /* bitsize */
189 TRUE, /* pc_relative */
190 0, /* bitpos */
191 complain_overflow_signed, /* complain_on_overflow */
192 bfd_elf_generic_reloc, /* special_function */
193 "R_FR30_9_PCREL", /* name */
194 FALSE, /* partial_inplace */
195 0x0000, /* src_mask */
196 0x00ff, /* dst_mask */
197 FALSE), /* pcrel_offset */
198
199 /* A PC relative 12 bit relocation, right shifted by 1. */
200 HOWTO (R_FR30_12_PCREL, /* type */
201 1, /* rightshift */
202 1, /* size (0 = byte, 1 = short, 2 = long) */
203 12, /* bitsize */
204 TRUE, /* pc_relative */
205 0, /* bitpos */
206 complain_overflow_signed, /* complain_on_overflow */
207 bfd_elf_generic_reloc, /* special_function */
208 "R_FR30_12_PCREL", /* name */
209 FALSE, /* partial_inplace */
210 0x0000, /* src_mask */
211 0x07ff, /* dst_mask */
212 FALSE), /* pcrel_offset */
213 /* GNU extension to record C++ vtable hierarchy */
214 HOWTO (R_FR30_GNU_VTINHERIT, /* type */
215 0, /* rightshift */
216 2, /* size (0 = byte, 1 = short, 2 = long) */
217 0, /* bitsize */
218 FALSE, /* pc_relative */
219 0, /* bitpos */
220 complain_overflow_dont, /* complain_on_overflow */
221 NULL, /* special_function */
222 "R_FR30_GNU_VTINHERIT", /* name */
223 FALSE, /* partial_inplace */
224 0, /* src_mask */
225 0, /* dst_mask */
226 FALSE), /* pcrel_offset */
227
228 /* GNU extension to record C++ vtable member usage */
229 HOWTO (R_FR30_GNU_VTENTRY, /* type */
230 0, /* rightshift */
231 2, /* size (0 = byte, 1 = short, 2 = long) */
232 0, /* bitsize */
233 FALSE, /* pc_relative */
234 0, /* bitpos */
235 complain_overflow_dont, /* complain_on_overflow */
236 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
237 "R_FR30_GNU_VTENTRY", /* name */
238 FALSE, /* partial_inplace */
239 0, /* src_mask */
240 0, /* dst_mask */
241 FALSE), /* pcrel_offset */
242 };
243 \f
244 /* Utility to actually perform an R_FR30_20 reloc. */
245
246 static bfd_reloc_status_type
247 fr30_elf_i20_reloc (abfd, reloc_entry, symbol, data,
248 input_section, output_bfd, error_message)
249 bfd *abfd;
250 arelent *reloc_entry;
251 asymbol *symbol;
252 PTR data;
253 asection *input_section;
254 bfd *output_bfd;
255 char **error_message ATTRIBUTE_UNUSED;
256 {
257 bfd_vma relocation;
258 unsigned long x;
259
260 /* This part is from bfd_elf_generic_reloc. */
261 if (output_bfd != (bfd *) NULL
262 && (symbol->flags & BSF_SECTION_SYM) == 0
263 && (! reloc_entry->howto->partial_inplace
264 || reloc_entry->addend == 0))
265 {
266 reloc_entry->address += input_section->output_offset;
267 return bfd_reloc_ok;
268 }
269
270 if (output_bfd != NULL)
271 /* FIXME: See bfd_perform_relocation. Is this right? */
272 return bfd_reloc_ok;
273
274 relocation =
275 symbol->value
276 + symbol->section->output_section->vma
277 + symbol->section->output_offset
278 + reloc_entry->addend;
279
280 if (relocation > (((bfd_vma) 1 << 20) - 1))
281 return bfd_reloc_overflow;
282
283 x = bfd_get_32 (abfd, (char *) data + reloc_entry->address);
284 x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4);
285 bfd_put_32 (abfd, (bfd_vma) x, (char *) data + reloc_entry->address);
286
287 return bfd_reloc_ok;
288 }
289 \f
290 /* Utility to actually perform a R_FR30_48 reloc. */
291
292 static bfd_reloc_status_type
293 fr30_elf_i32_reloc (abfd, reloc_entry, symbol, data,
294 input_section, output_bfd, error_message)
295 bfd *abfd;
296 arelent *reloc_entry;
297 asymbol *symbol;
298 PTR data;
299 asection *input_section;
300 bfd *output_bfd;
301 char **error_message ATTRIBUTE_UNUSED;
302 {
303 bfd_vma relocation;
304
305 /* This part is from bfd_elf_generic_reloc. */
306 if (output_bfd != (bfd *) NULL
307 && (symbol->flags & BSF_SECTION_SYM) == 0
308 && (! reloc_entry->howto->partial_inplace
309 || reloc_entry->addend == 0))
310 {
311 reloc_entry->address += input_section->output_offset;
312 return bfd_reloc_ok;
313 }
314
315 if (output_bfd != NULL)
316 /* FIXME: See bfd_perform_relocation. Is this right? */
317 return bfd_reloc_ok;
318
319 relocation =
320 symbol->value
321 + symbol->section->output_section->vma
322 + symbol->section->output_offset
323 + reloc_entry->addend;
324
325 bfd_put_32 (abfd, relocation, (char *) data + reloc_entry->address + 2);
326
327 return bfd_reloc_ok;
328 }
329 \f
330 /* Map BFD reloc types to FR30 ELF reloc types. */
331
332 struct fr30_reloc_map
333 {
334 bfd_reloc_code_real_type bfd_reloc_val;
335 unsigned int fr30_reloc_val;
336 };
337
338 static const struct fr30_reloc_map fr30_reloc_map [] =
339 {
340 { BFD_RELOC_NONE, R_FR30_NONE },
341 { BFD_RELOC_8, R_FR30_8 },
342 { BFD_RELOC_FR30_20, R_FR30_20 },
343 { BFD_RELOC_32, R_FR30_32 },
344 { BFD_RELOC_FR30_48, R_FR30_48 },
345 { BFD_RELOC_FR30_6_IN_4, R_FR30_6_IN_4 },
346 { BFD_RELOC_FR30_8_IN_8, R_FR30_8_IN_8 },
347 { BFD_RELOC_FR30_9_IN_8, R_FR30_9_IN_8 },
348 { BFD_RELOC_FR30_10_IN_8, R_FR30_10_IN_8 },
349 { BFD_RELOC_FR30_9_PCREL, R_FR30_9_PCREL },
350 { BFD_RELOC_FR30_12_PCREL, R_FR30_12_PCREL },
351 { BFD_RELOC_VTABLE_INHERIT, R_FR30_GNU_VTINHERIT },
352 { BFD_RELOC_VTABLE_ENTRY, R_FR30_GNU_VTENTRY },
353 };
354
355 static reloc_howto_type *
356 fr30_reloc_type_lookup (abfd, code)
357 bfd *abfd ATTRIBUTE_UNUSED;
358 bfd_reloc_code_real_type code;
359 {
360 unsigned int i;
361
362 for (i = sizeof (fr30_reloc_map) / sizeof (fr30_reloc_map[0]);
363 --i;)
364 if (fr30_reloc_map [i].bfd_reloc_val == code)
365 return & fr30_elf_howto_table [fr30_reloc_map[i].fr30_reloc_val];
366
367 return NULL;
368 }
369
370 static reloc_howto_type *
371 fr30_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
372 {
373 unsigned int i;
374
375 for (i = 0;
376 i < sizeof (fr30_elf_howto_table) / sizeof (fr30_elf_howto_table[0]);
377 i++)
378 if (fr30_elf_howto_table[i].name != NULL
379 && strcasecmp (fr30_elf_howto_table[i].name, r_name) == 0)
380 return &fr30_elf_howto_table[i];
381
382 return NULL;
383 }
384
385 /* Set the howto pointer for an FR30 ELF reloc. */
386
387 static void
388 fr30_info_to_howto_rela (abfd, cache_ptr, dst)
389 bfd *abfd ATTRIBUTE_UNUSED;
390 arelent *cache_ptr;
391 Elf_Internal_Rela *dst;
392 {
393 unsigned int r_type;
394
395 r_type = ELF32_R_TYPE (dst->r_info);
396 BFD_ASSERT (r_type < (unsigned int) R_FR30_max);
397 cache_ptr->howto = & fr30_elf_howto_table [r_type];
398 }
399 \f
400 /* Perform a single relocation. By default we use the standard BFD
401 routines, but a few relocs, we have to do them ourselves. */
402
403 static bfd_reloc_status_type
404 fr30_final_link_relocate (howto, input_bfd, input_section, contents, rel,
405 relocation)
406 reloc_howto_type *howto;
407 bfd *input_bfd;
408 asection *input_section;
409 bfd_byte *contents;
410 Elf_Internal_Rela *rel;
411 bfd_vma relocation;
412 {
413 bfd_reloc_status_type r = bfd_reloc_ok;
414 bfd_vma x;
415 bfd_signed_vma srel;
416
417 switch (howto->type)
418 {
419 case R_FR30_20:
420 contents += rel->r_offset;
421 relocation += rel->r_addend;
422
423 if (relocation > ((1 << 20) - 1))
424 return bfd_reloc_overflow;
425
426 x = bfd_get_32 (input_bfd, contents);
427 x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4);
428 bfd_put_32 (input_bfd, x, contents);
429 break;
430
431 case R_FR30_48:
432 contents += rel->r_offset + 2;
433 relocation += rel->r_addend;
434 bfd_put_32 (input_bfd, relocation, contents);
435 break;
436
437 case R_FR30_9_PCREL:
438 contents += rel->r_offset + 1;
439 srel = (bfd_signed_vma) relocation;
440 srel += rel->r_addend;
441 srel -= rel->r_offset;
442 srel -= 2; /* Branch instructions add 2 to the PC... */
443 srel -= (input_section->output_section->vma +
444 input_section->output_offset);
445
446 if (srel & 1)
447 return bfd_reloc_outofrange;
448 if (srel > ((1 << 8) - 1) || (srel < - (1 << 8)))
449 return bfd_reloc_overflow;
450
451 bfd_put_8 (input_bfd, srel >> 1, contents);
452 break;
453
454 case R_FR30_12_PCREL:
455 contents += rel->r_offset;
456 srel = (bfd_signed_vma) relocation;
457 srel += rel->r_addend;
458 srel -= rel->r_offset;
459 srel -= 2; /* Branch instructions add 2 to the PC... */
460 srel -= (input_section->output_section->vma +
461 input_section->output_offset);
462
463 if (srel & 1)
464 return bfd_reloc_outofrange;
465 if (srel > ((1 << 11) - 1) || (srel < - (1 << 11)))
466 return bfd_reloc_overflow;
467
468 x = bfd_get_16 (input_bfd, contents);
469 x = (x & 0xf800) | ((srel >> 1) & 0x7ff);
470 bfd_put_16 (input_bfd, x, contents);
471 break;
472
473 default:
474 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
475 contents, rel->r_offset,
476 relocation, rel->r_addend);
477 }
478
479 return r;
480 }
481 \f
482 /* Relocate an FR30 ELF section.
483
484 The RELOCATE_SECTION function is called by the new ELF backend linker
485 to handle the relocations for a section.
486
487 The relocs are always passed as Rela structures; if the section
488 actually uses Rel structures, the r_addend field will always be
489 zero.
490
491 This function is responsible for adjusting the section contents as
492 necessary, and (if using Rela relocs and generating a relocatable
493 output file) adjusting the reloc addend as necessary.
494
495 This function does not have to worry about setting the reloc
496 address or the reloc symbol index.
497
498 LOCAL_SYMS is a pointer to the swapped in local symbols.
499
500 LOCAL_SECTIONS is an array giving the section in the input file
501 corresponding to the st_shndx field of each local symbol.
502
503 The global hash table entry for the global symbols can be found
504 via elf_sym_hashes (input_bfd).
505
506 When generating relocatable output, this function must handle
507 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
508 going to be the section symbol corresponding to the output
509 section, which means that the addend must be adjusted
510 accordingly. */
511
512 static bfd_boolean
513 fr30_elf_relocate_section (output_bfd, info, input_bfd, input_section,
514 contents, relocs, local_syms, local_sections)
515 bfd *output_bfd;
516 struct bfd_link_info *info;
517 bfd *input_bfd;
518 asection *input_section;
519 bfd_byte *contents;
520 Elf_Internal_Rela *relocs;
521 Elf_Internal_Sym *local_syms;
522 asection **local_sections;
523 {
524 Elf_Internal_Shdr *symtab_hdr;
525 struct elf_link_hash_entry **sym_hashes;
526 Elf_Internal_Rela *rel;
527 Elf_Internal_Rela *relend;
528
529 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
530 sym_hashes = elf_sym_hashes (input_bfd);
531 relend = relocs + input_section->reloc_count;
532
533 for (rel = relocs; rel < relend; rel ++)
534 {
535 reloc_howto_type *howto;
536 unsigned long r_symndx;
537 Elf_Internal_Sym *sym;
538 asection *sec;
539 struct elf_link_hash_entry *h;
540 bfd_vma relocation;
541 bfd_reloc_status_type r;
542 const char *name;
543 int r_type;
544
545 r_type = ELF32_R_TYPE (rel->r_info);
546
547 if ( r_type == R_FR30_GNU_VTINHERIT
548 || r_type == R_FR30_GNU_VTENTRY)
549 continue;
550
551 r_symndx = ELF32_R_SYM (rel->r_info);
552
553 howto = fr30_elf_howto_table + ELF32_R_TYPE (rel->r_info);
554 h = NULL;
555 sym = NULL;
556 sec = NULL;
557
558 if (r_symndx < symtab_hdr->sh_info)
559 {
560 sym = local_syms + r_symndx;
561 sec = local_sections [r_symndx];
562 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
563
564 name = bfd_elf_string_from_elf_section
565 (input_bfd, symtab_hdr->sh_link, sym->st_name);
566 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
567 }
568 else
569 {
570 bfd_boolean unresolved_reloc, warned;
571
572 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
573 r_symndx, symtab_hdr, sym_hashes,
574 h, sec, relocation,
575 unresolved_reloc, warned);
576
577 name = h->root.root.string;
578 }
579
580 if (sec != NULL && elf_discarded_section (sec))
581 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
582 rel, relend, howto, contents);
583
584 if (info->relocatable)
585 continue;
586
587 r = fr30_final_link_relocate (howto, input_bfd, input_section,
588 contents, rel, relocation);
589
590 if (r != bfd_reloc_ok)
591 {
592 const char * msg = (const char *) NULL;
593
594 switch (r)
595 {
596 case bfd_reloc_overflow:
597 r = info->callbacks->reloc_overflow
598 (info, (h ? &h->root : NULL), name, howto->name,
599 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
600 break;
601
602 case bfd_reloc_undefined:
603 r = info->callbacks->undefined_symbol
604 (info, name, input_bfd, input_section, rel->r_offset,
605 TRUE);
606 break;
607
608 case bfd_reloc_outofrange:
609 msg = _("internal error: out of range error");
610 break;
611
612 case bfd_reloc_notsupported:
613 msg = _("internal error: unsupported relocation error");
614 break;
615
616 case bfd_reloc_dangerous:
617 msg = _("internal error: dangerous relocation");
618 break;
619
620 default:
621 msg = _("internal error: unknown error");
622 break;
623 }
624
625 if (msg)
626 r = info->callbacks->warning
627 (info, msg, name, input_bfd, input_section, rel->r_offset);
628
629 if (! r)
630 return FALSE;
631 }
632 }
633
634 return TRUE;
635 }
636 \f
637 /* Return the section that should be marked against GC for a given
638 relocation. */
639
640 static asection *
641 fr30_elf_gc_mark_hook (asection *sec,
642 struct bfd_link_info *info,
643 Elf_Internal_Rela *rel,
644 struct elf_link_hash_entry *h,
645 Elf_Internal_Sym *sym)
646 {
647 if (h != NULL)
648 switch (ELF32_R_TYPE (rel->r_info))
649 {
650 case R_FR30_GNU_VTINHERIT:
651 case R_FR30_GNU_VTENTRY:
652 return NULL;
653 }
654
655 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
656 }
657
658 /* Look through the relocs for a section during the first phase.
659 Since we don't do .gots or .plts, we just need to consider the
660 virtual table relocs for gc. */
661
662 static bfd_boolean
663 fr30_elf_check_relocs (abfd, info, sec, relocs)
664 bfd *abfd;
665 struct bfd_link_info *info;
666 asection *sec;
667 const Elf_Internal_Rela *relocs;
668 {
669 Elf_Internal_Shdr *symtab_hdr;
670 struct elf_link_hash_entry **sym_hashes;
671 const Elf_Internal_Rela *rel;
672 const Elf_Internal_Rela *rel_end;
673
674 if (info->relocatable)
675 return TRUE;
676
677 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
678 sym_hashes = elf_sym_hashes (abfd);
679
680 rel_end = relocs + sec->reloc_count;
681 for (rel = relocs; rel < rel_end; rel++)
682 {
683 struct elf_link_hash_entry *h;
684 unsigned long r_symndx;
685
686 r_symndx = ELF32_R_SYM (rel->r_info);
687 if (r_symndx < symtab_hdr->sh_info)
688 h = NULL;
689 else
690 {
691 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
692 while (h->root.type == bfd_link_hash_indirect
693 || h->root.type == bfd_link_hash_warning)
694 h = (struct elf_link_hash_entry *) h->root.u.i.link;
695 }
696
697 switch (ELF32_R_TYPE (rel->r_info))
698 {
699 /* This relocation describes the C++ object vtable hierarchy.
700 Reconstruct it for later use during GC. */
701 case R_FR30_GNU_VTINHERIT:
702 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
703 return FALSE;
704 break;
705
706 /* This relocation describes which C++ vtable entries are actually
707 used. Record for later use during GC. */
708 case R_FR30_GNU_VTENTRY:
709 BFD_ASSERT (h != NULL);
710 if (h != NULL
711 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
712 return FALSE;
713 break;
714 }
715 }
716
717 return TRUE;
718 }
719 \f
720 #define ELF_ARCH bfd_arch_fr30
721 #define ELF_MACHINE_CODE EM_FR30
722 #define ELF_MACHINE_ALT1 EM_CYGNUS_FR30
723 #define ELF_MAXPAGESIZE 0x1000
724
725 #define TARGET_BIG_SYM bfd_elf32_fr30_vec
726 #define TARGET_BIG_NAME "elf32-fr30"
727
728 #define elf_info_to_howto_rel NULL
729 #define elf_info_to_howto fr30_info_to_howto_rela
730 #define elf_backend_relocate_section fr30_elf_relocate_section
731 #define elf_backend_gc_mark_hook fr30_elf_gc_mark_hook
732 #define elf_backend_check_relocs fr30_elf_check_relocs
733
734 #define elf_backend_can_gc_sections 1
735 #define elf_backend_rela_normal 1
736
737 #define bfd_elf32_bfd_reloc_type_lookup fr30_reloc_type_lookup
738 #define bfd_elf32_bfd_reloc_name_lookup fr30_reloc_name_lookup
739
740 #include "elf32-target.h"
GDB Binutils - Deliverables
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