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* opncls.c (bfd_close): Return TRUE for BFD_IN_MEMORY.
[binutils.git] / bfd / elf32-mcore.c
blob4d11bb00e9a21958549d2c3fdb0e3172ae65c389
1 /* Motorola MCore specific support for 32-bit ELF
2 Copyright 1994, 1995, 1999, 2000, 2001, 2002, 2003, 2004
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 /* This file is based on a preliminary RCE ELF ABI. The
22 information may not match the final RCE ELF ABI. */
23
24 #include "bfd.h"
25 #include "sysdep.h"
26 #include "bfdlink.h"
27 #include "libbfd.h"
28 #include "elf-bfd.h"
29 #include "elf/mcore.h"
30 #include <assert.h>
31
32 /* RELA relocs are used here... */
33
34 static void mcore_elf_howto_init
35 PARAMS ((void));
36 static reloc_howto_type * mcore_elf_reloc_type_lookup
37 PARAMS ((bfd *, bfd_reloc_code_real_type));
38 static void mcore_elf_info_to_howto
39 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
40 static bfd_boolean mcore_elf_set_private_flags
41 PARAMS ((bfd *, flagword));
42 static bfd_boolean mcore_elf_merge_private_bfd_data
43 PARAMS ((bfd *, bfd *));
44 static bfd_reloc_status_type mcore_elf_unsupported_reloc
45 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
46 static bfd_boolean mcore_elf_relocate_section
47 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
48 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
49 static asection * mcore_elf_gc_mark_hook
50 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
51 struct elf_link_hash_entry *, Elf_Internal_Sym *));
52 static bfd_boolean mcore_elf_gc_sweep_hook
53 PARAMS ((bfd *, struct bfd_link_info *, asection *,
54 const Elf_Internal_Rela *));
55 static bfd_boolean mcore_elf_check_relocs
56 PARAMS ((bfd *, struct bfd_link_info *, asection *,
57 const Elf_Internal_Rela *));
58
59 static reloc_howto_type * mcore_elf_howto_table [(int) R_MCORE_max];
60
61 static reloc_howto_type mcore_elf_howto_raw[] =
62 {
63 /* This reloc does nothing. */
64 HOWTO (R_MCORE_NONE, /* type */
65 0, /* rightshift */
66 2, /* size (0 = byte, 1 = short, 2 = long) */
67 32, /* bitsize */
68 FALSE, /* pc_relative */
69 0, /* bitpos */
70 complain_overflow_bitfield, /* complain_on_overflow */
71 NULL, /* special_function */
72 "R_MCORE_NONE", /* name */
73 FALSE, /* partial_inplace */
74 0, /* src_mask */
75 0, /* dst_mask */
76 FALSE), /* pcrel_offset */
77
78 /* A standard 32 bit relocation. */
79 HOWTO (R_MCORE_ADDR32, /* type */
80 0, /* rightshift */
81 2, /* size (0 = byte, 1 = short, 2 = long) */
82 32, /* bitsize */
83 FALSE, /* pc_relative */
84 0, /* bitpos */
85 complain_overflow_bitfield, /* complain_on_overflow */
86 bfd_elf_generic_reloc, /* special_function */
87 "ADDR32", /* name *//* For compatibility with coff/pe port. */
88 FALSE, /* partial_inplace */
89 0x0, /* src_mask */
90 0xffffffff, /* dst_mask */
91 FALSE), /* pcrel_offset */
92
93 /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
94 Should not appear in object files. */
95 HOWTO (R_MCORE_PCRELIMM8BY4, /* type */
96 2, /* rightshift */
97 1, /* size (0 = byte, 1 = short, 2 = long) */
98 8, /* bitsize */
99 TRUE, /* pc_relative */
100 0, /* bitpos */
101 complain_overflow_bitfield, /* complain_on_overflow */
102 mcore_elf_unsupported_reloc, /* special_function */
103 "R_MCORE_PCRELIMM8BY4",/* name */
104 FALSE, /* partial_inplace */
105 0, /* src_mask */
106 0, /* dst_mask */
107 TRUE), /* pcrel_offset */
108
109 /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
110 Span 2k instructions == 4k bytes.
111 Only useful pieces at the relocated address are the opcode (5 bits) */
112 HOWTO (R_MCORE_PCRELIMM11BY2,/* type */
113 1, /* rightshift */
114 1, /* size (0 = byte, 1 = short, 2 = long) */
115 11, /* bitsize */
116 TRUE, /* pc_relative */
117 0, /* bitpos */
118 complain_overflow_signed, /* complain_on_overflow */
119 bfd_elf_generic_reloc, /* special_function */
120 "R_MCORE_PCRELIMM11BY2",/* name */
121 FALSE, /* partial_inplace */
122 0x0, /* src_mask */
123 0x7ff, /* dst_mask */
124 TRUE), /* pcrel_offset */
125
126 /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */
127 HOWTO (R_MCORE_PCRELIMM4BY2, /* type */
128 1, /* rightshift */
129 1, /* size (0 = byte, 1 = short, 2 = long) */
130 4, /* bitsize */
131 TRUE, /* pc_relative */
132 0, /* bitpos */
133 complain_overflow_bitfield, /* complain_on_overflow */
134 mcore_elf_unsupported_reloc,/* special_function */
135 "R_MCORE_PCRELIMM4BY2",/* name */
136 FALSE, /* partial_inplace */
137 0, /* src_mask */
138 0, /* dst_mask */
139 TRUE), /* pcrel_offset */
140
141 /* 32-bit pc-relative. Eventually this will help support PIC code. */
142 HOWTO (R_MCORE_PCREL32, /* type */
143 0, /* rightshift */
144 2, /* size (0 = byte, 1 = short, 2 = long) */
145 32, /* bitsize */
146 TRUE, /* pc_relative */
147 0, /* bitpos */
148 complain_overflow_bitfield, /* complain_on_overflow */
149 bfd_elf_generic_reloc, /* special_function */
150 "R_MCORE_PCREL32", /* name */
151 FALSE, /* partial_inplace */
152 0x0, /* src_mask */
153 0xffffffff, /* dst_mask */
154 TRUE), /* pcrel_offset */
155
156 /* Like PCRELIMM11BY2, this relocation indicates that there is a
157 'jsri' at the specified address. There is a separate relocation
158 entry for the literal pool entry that it references, but we
159 might be able to change the jsri to a bsr if the target turns out
160 to be close enough [even though we won't reclaim the literal pool
161 entry, we'll get some runtime efficiency back]. Note that this
162 is a relocation that we are allowed to safely ignore. */
163 HOWTO (R_MCORE_PCRELJSR_IMM11BY2,/* type */
164 1, /* rightshift */
165 1, /* size (0 = byte, 1 = short, 2 = long) */
166 11, /* bitsize */
167 TRUE, /* pc_relative */
168 0, /* bitpos */
169 complain_overflow_signed, /* complain_on_overflow */
170 bfd_elf_generic_reloc, /* special_function */
171 "R_MCORE_PCRELJSR_IMM11BY2", /* name */
172 FALSE, /* partial_inplace */
173 0x0, /* src_mask */
174 0x7ff, /* dst_mask */
175 TRUE), /* pcrel_offset */
176
177 /* GNU extension to record C++ vtable hierarchy */
178 HOWTO (R_MCORE_GNU_VTINHERIT, /* type */
179 0, /* rightshift */
180 2, /* size (0 = byte, 1 = short, 2 = long) */
181 0, /* bitsize */
182 FALSE, /* pc_relative */
183 0, /* bitpos */
184 complain_overflow_dont, /* complain_on_overflow */
185 NULL, /* special_function */
186 "R_MCORE_GNU_VTINHERIT", /* name */
187 FALSE, /* partial_inplace */
188 0, /* src_mask */
189 0, /* dst_mask */
190 FALSE), /* pcrel_offset */
191
192 /* GNU extension to record C++ vtable member usage */
193 HOWTO (R_MCORE_GNU_VTENTRY, /* type */
194 0, /* rightshift */
195 2, /* size (0 = byte, 1 = short, 2 = long) */
196 0, /* bitsize */
197 FALSE, /* pc_relative */
198 0, /* bitpos */
199 complain_overflow_dont,/* complain_on_overflow */
200 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
201 "R_MCORE_GNU_VTENTRY", /* name */
202 FALSE, /* partial_inplace */
203 0, /* src_mask */
204 0, /* dst_mask */
205 FALSE), /* pcrel_offset */
206
207 HOWTO (R_MCORE_RELATIVE, /* type */
208 0, /* rightshift */
209 2, /* size (0 = byte, 1 = short, 2 = long) */
210 32, /* bitsize */
211 FALSE, /* pc_relative */
212 0, /* bitpos */
213 complain_overflow_signed, /* complain_on_overflow */
214 NULL, /* special_function */
215 "R_MCORE_RELATIVE", /* name */
216 TRUE, /* partial_inplace */
217 0xffffffff, /* src_mask */
218 0xffffffff, /* dst_mask */
219 FALSE) /* pcrel_offset */
220 };
221
222 #ifndef NUM_ELEM
223 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
224 #endif
225 \f
226 /* Initialize the mcore_elf_howto_table, so that linear accesses can be done. */
227 static void
228 mcore_elf_howto_init ()
229 {
230 unsigned int i;
231
232 for (i = NUM_ELEM (mcore_elf_howto_raw); i--;)
233 {
234 unsigned int type;
235
236 type = mcore_elf_howto_raw[i].type;
237
238 BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table));
239
240 mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i];
241 }
242 }
243 \f
244 static reloc_howto_type *
245 mcore_elf_reloc_type_lookup (abfd, code)
246 bfd * abfd ATTRIBUTE_UNUSED;
247 bfd_reloc_code_real_type code;
248 {
249 enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE;
250
251 switch (code)
252 {
253 case BFD_RELOC_NONE: mcore_reloc = R_MCORE_NONE; break;
254 case BFD_RELOC_32: mcore_reloc = R_MCORE_ADDR32; break;
255 case BFD_RELOC_MCORE_PCREL_IMM8BY4: mcore_reloc = R_MCORE_PCRELIMM8BY4; break;
256 case BFD_RELOC_MCORE_PCREL_IMM11BY2: mcore_reloc = R_MCORE_PCRELIMM11BY2; break;
257 case BFD_RELOC_MCORE_PCREL_IMM4BY2: mcore_reloc = R_MCORE_PCRELIMM4BY2; break;
258 case BFD_RELOC_32_PCREL: mcore_reloc = R_MCORE_PCREL32; break;
259 case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break;
260 case BFD_RELOC_VTABLE_INHERIT: mcore_reloc = R_MCORE_GNU_VTINHERIT; break;
261 case BFD_RELOC_VTABLE_ENTRY: mcore_reloc = R_MCORE_GNU_VTENTRY; break;
262 case BFD_RELOC_RVA: mcore_reloc = R_MCORE_RELATIVE; break;
263 default:
264 return (reloc_howto_type *)NULL;
265 }
266
267 if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */
268 mcore_elf_howto_init ();
269
270 return mcore_elf_howto_table [(int) mcore_reloc];
271 };
272
273 /* Set the howto pointer for a RCE ELF reloc. */
274 static void
275 mcore_elf_info_to_howto (abfd, cache_ptr, dst)
276 bfd * abfd ATTRIBUTE_UNUSED;
277 arelent * cache_ptr;
278 Elf_Internal_Rela * dst;
279 {
280 if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */
281 mcore_elf_howto_init ();
282
283 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_MCORE_max);
284
285 cache_ptr->howto = mcore_elf_howto_table [ELF32_R_TYPE (dst->r_info)];
286 }
287
288 /* Function to set whether a module needs the -mrelocatable bit set. */
289 static bfd_boolean
290 mcore_elf_set_private_flags (abfd, flags)
291 bfd * abfd;
292 flagword flags;
293 {
294 BFD_ASSERT (! elf_flags_init (abfd)
295 || elf_elfheader (abfd)->e_flags == flags);
296
297 elf_elfheader (abfd)->e_flags = flags;
298 elf_flags_init (abfd) = TRUE;
299 return TRUE;
300 }
301
302 /* Merge backend specific data from an object file to the output
303 object file when linking. */
304 static bfd_boolean
305 mcore_elf_merge_private_bfd_data (ibfd, obfd)
306 bfd * ibfd;
307 bfd * obfd;
308 {
309 flagword old_flags;
310 flagword new_flags;
311
312 /* Check if we have the same endianess */
313 if (! _bfd_generic_verify_endian_match (ibfd, obfd))
314 return FALSE;
315
316 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
317 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
318 return TRUE;
319
320 new_flags = elf_elfheader (ibfd)->e_flags;
321 old_flags = elf_elfheader (obfd)->e_flags;
322
323 if (! elf_flags_init (obfd)) /* First call, no flags set */
324 {
325 elf_flags_init (obfd) = TRUE;
326 elf_elfheader (obfd)->e_flags = new_flags;
327 }
328 else if (new_flags == old_flags) /* Compatible flags are ok */
329 ;
330 else
331 {
332 /* FIXME */
333 }
334
335 return TRUE;
336 }
337 \f
338 /* Don't pretend we can deal with unsupported relocs. */
339
340 static bfd_reloc_status_type
341 mcore_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
342 output_bfd, error_message)
343 bfd * abfd;
344 arelent * reloc_entry;
345 asymbol * symbol ATTRIBUTE_UNUSED;
346 PTR data ATTRIBUTE_UNUSED;
347 asection * input_section ATTRIBUTE_UNUSED;
348 bfd * output_bfd ATTRIBUTE_UNUSED;
349 char ** error_message ATTRIBUTE_UNUSED;
350 {
351 BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
352
353 _bfd_error_handler (_("%B: Relocation %s (%d) is not currently supported.\n"),
354 abfd,
355 reloc_entry->howto->name,
356 reloc_entry->howto->type);
357
358 return bfd_reloc_notsupported;
359 }
360 \f
361 /* The RELOCATE_SECTION function is called by the ELF backend linker
362 to handle the relocations for a section.
363
364 The relocs are always passed as Rela structures; if the section
365 actually uses Rel structures, the r_addend field will always be
366 zero.
367
368 This function is responsible for adjust the section contents as
369 necessary, and (if using Rela relocs and generating a
370 relocatable output file) adjusting the reloc addend as
371 necessary.
372
373 This function does not have to worry about setting the reloc
374 address or the reloc symbol index.
375
376 LOCAL_SYMS is a pointer to the swapped in local symbols.
377
378 LOCAL_SECTIONS is an array giving the section in the input file
379 corresponding to the st_shndx field of each local symbol.
380
381 The global hash table entry for the global symbols can be found
382 via elf_sym_hashes (input_bfd).
383
384 When generating relocatable output, this function must handle
385 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
386 going to be the section symbol corresponding to the output
387 section, which means that the addend must be adjusted
388 accordingly. */
389
390 static bfd_boolean
391 mcore_elf_relocate_section (output_bfd, info, input_bfd, input_section,
392 contents, relocs, local_syms, local_sections)
393 bfd * output_bfd;
394 struct bfd_link_info * info;
395 bfd * input_bfd;
396 asection * input_section;
397 bfd_byte * contents;
398 Elf_Internal_Rela * relocs;
399 Elf_Internal_Sym * local_syms;
400 asection ** local_sections;
401 {
402 Elf_Internal_Shdr * symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
403 struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd);
404 Elf_Internal_Rela * rel = relocs;
405 Elf_Internal_Rela * relend = relocs + input_section->reloc_count;
406 bfd_boolean ret = TRUE;
407
408 #ifdef DEBUG
409 _bfd_error_handler
410 ("mcore_elf_relocate_section called for %B section %A, %ld relocations%s",
411 input_bfd,
412 input_section,
413 (long) input_section->reloc_count,
414 (info->relocatable) ? " (relocatable)" : "");
415 #endif
416
417 if (info->relocatable)
418 return TRUE;
419
420 if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */
421 mcore_elf_howto_init ();
422
423 for (; rel < relend; rel++)
424 {
425 enum elf_mcore_reloc_type r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info);
426 bfd_vma offset = rel->r_offset;
427 bfd_vma addend = rel->r_addend;
428 bfd_reloc_status_type r = bfd_reloc_other;
429 asection * sec = (asection *) 0;
430 reloc_howto_type * howto;
431 bfd_vma relocation;
432 Elf_Internal_Sym * sym = (Elf_Internal_Sym *) 0;
433 unsigned long r_symndx;
434 struct elf_link_hash_entry * h = (struct elf_link_hash_entry *) 0;
435 unsigned short oldinst = 0;
436
437 /* Unknown relocation handling */
438 if ((unsigned) r_type >= (unsigned) R_MCORE_max
439 || ! mcore_elf_howto_table [(int)r_type])
440 {
441 _bfd_error_handler (_("%B: Unknown relocation type %d\n"),
442 input_bfd, (int) r_type);
443
444 bfd_set_error (bfd_error_bad_value);
445 ret = FALSE;
446 continue;
447 }
448
449 howto = mcore_elf_howto_table [(int) r_type];
450 r_symndx = ELF32_R_SYM (rel->r_info);
451
452 /* Complain about known relocation that are not yet supported. */
453 if (howto->special_function == mcore_elf_unsupported_reloc)
454 {
455 _bfd_error_handler (_("%B: Relocation %s (%d) is not currently supported.\n"),
456 input_bfd,
457 howto->name,
458 (int)r_type);
459
460 bfd_set_error (bfd_error_bad_value);
461 ret = FALSE;
462 continue;
463 }
464
465 if (r_symndx < symtab_hdr->sh_info)
466 {
467 sym = local_syms + r_symndx;
468 sec = local_sections [r_symndx];
469 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
470 addend = rel->r_addend;
471 }
472 else
473 {
474 bfd_boolean unresolved_reloc, warned;
475
476 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
477 r_symndx, symtab_hdr, sym_hashes,
478 h, sec, relocation,
479 unresolved_reloc, warned);
480 }
481
482 switch (r_type)
483 {
484 default:
485 break;
486
487 case R_MCORE_PCRELJSR_IMM11BY2:
488 oldinst = bfd_get_16 (input_bfd, contents + offset);
489 #define MCORE_INST_BSR 0xF800
490 bfd_put_16 (input_bfd, (bfd_vma) MCORE_INST_BSR, contents + offset);
491 break;
492 }
493
494 #ifdef DEBUG
495 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
496 howto->name, r_type, r_symndx, (long) offset, (long) addend);
497 #endif
498
499 r = _bfd_final_link_relocate
500 (howto, input_bfd, input_section, contents, offset, relocation, addend);
501
502 if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2)
503 {
504 /* Wasn't ok, back it out and give up. */
505 bfd_put_16 (input_bfd, (bfd_vma) oldinst, contents + offset);
506 r = bfd_reloc_ok;
507 }
508
509 if (r != bfd_reloc_ok)
510 {
511 ret = FALSE;
512
513 switch (r)
514 {
515 default:
516 break;
517
518 case bfd_reloc_overflow:
519 {
520 const char * name;
521
522 if (h != NULL)
523 name = NULL;
524 else
525 {
526 name = bfd_elf_string_from_elf_section
527 (input_bfd, symtab_hdr->sh_link, sym->st_name);
528
529 if (name == NULL)
530 break;
531
532 if (* name == '\0')
533 name = bfd_section_name (input_bfd, sec);
534 }
535
536 (*info->callbacks->reloc_overflow)
537 (info, (h ? &h->root : NULL), name, howto->name,
538 (bfd_vma) 0, input_bfd, input_section, offset);
539 }
540 break;
541 }
542 }
543 }
544
545 #ifdef DEBUG
546 fprintf (stderr, "\n");
547 #endif
548
549 return ret;
550 }
551 \f
552 /* Return the section that should be marked against GC for a given
553 relocation. */
554
555 static asection *
556 mcore_elf_gc_mark_hook (sec, info, rel, h, sym)
557 asection * sec;
558 struct bfd_link_info * info ATTRIBUTE_UNUSED;
559 Elf_Internal_Rela * rel;
560 struct elf_link_hash_entry * h;
561 Elf_Internal_Sym * sym;
562 {
563 if (h != NULL)
564 {
565 switch (ELF32_R_TYPE (rel->r_info))
566 {
567 case R_MCORE_GNU_VTINHERIT:
568 case R_MCORE_GNU_VTENTRY:
569 break;
570
571 default:
572 switch (h->root.type)
573 {
574 case bfd_link_hash_defined:
575 case bfd_link_hash_defweak:
576 return h->root.u.def.section;
577
578 case bfd_link_hash_common:
579 return h->root.u.c.p->section;
580
581 default:
582 break;
583 }
584 }
585 }
586 else
587 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
588
589 return NULL;
590 }
591
592 /* Update the got entry reference counts for the section being removed. */
593
594 static bfd_boolean
595 mcore_elf_gc_sweep_hook (abfd, info, sec, relocs)
596 bfd * abfd ATTRIBUTE_UNUSED;
597 struct bfd_link_info * info ATTRIBUTE_UNUSED;
598 asection * sec ATTRIBUTE_UNUSED;
599 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
600 {
601 return TRUE;
602 }
603
604 /* Look through the relocs for a section during the first phase.
605 Since we don't do .gots or .plts, we just need to consider the
606 virtual table relocs for gc. */
607
608 static bfd_boolean
609 mcore_elf_check_relocs (abfd, info, sec, relocs)
610 bfd * abfd;
611 struct bfd_link_info * info;
612 asection * sec;
613 const Elf_Internal_Rela * relocs;
614 {
615 Elf_Internal_Shdr * symtab_hdr;
616 struct elf_link_hash_entry ** sym_hashes;
617 struct elf_link_hash_entry ** sym_hashes_end;
618 const Elf_Internal_Rela * rel;
619 const Elf_Internal_Rela * rel_end;
620
621 if (info->relocatable)
622 return TRUE;
623
624 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
625 sym_hashes = elf_sym_hashes (abfd);
626 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
627 if (!elf_bad_symtab (abfd))
628 sym_hashes_end -= symtab_hdr->sh_info;
629
630 rel_end = relocs + sec->reloc_count;
631
632 for (rel = relocs; rel < rel_end; rel++)
633 {
634 struct elf_link_hash_entry * h;
635 unsigned long r_symndx;
636
637 r_symndx = ELF32_R_SYM (rel->r_info);
638
639 if (r_symndx < symtab_hdr->sh_info)
640 h = NULL;
641 else
642 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
643
644 switch (ELF32_R_TYPE (rel->r_info))
645 {
646 /* This relocation describes the C++ object vtable hierarchy.
647 Reconstruct it for later use during GC. */
648 case R_MCORE_GNU_VTINHERIT:
649 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
650 return FALSE;
651 break;
652
653 /* This relocation describes which C++ vtable entries are actually
654 used. Record for later use during GC. */
655 case R_MCORE_GNU_VTENTRY:
656 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
657 return FALSE;
658 break;
659 }
660 }
661
662 return TRUE;
663 }
664
665 static struct bfd_elf_special_section const mcore_elf_special_sections[]=
666 {
667 { ".ctors", 6, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
668 { ".dtors", 6, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
669 { NULL, 0, 0, 0, 0 }
670 };
671
672 #define TARGET_BIG_SYM bfd_elf32_mcore_big_vec
673 #define TARGET_BIG_NAME "elf32-mcore-big"
674 #define TARGET_LITTLE_SYM bfd_elf32_mcore_little_vec
675 #define TARGET_LITTLE_NAME "elf32-mcore-little"
676
677 #define ELF_ARCH bfd_arch_mcore
678 #define ELF_MACHINE_CODE EM_MCORE
679 #define ELF_MAXPAGESIZE 0x1000 /* 4k, if we ever have 'em */
680 #define elf_info_to_howto mcore_elf_info_to_howto
681 #define elf_info_to_howto_rel NULL
682
683 #define bfd_elf32_bfd_merge_private_bfd_data mcore_elf_merge_private_bfd_data
684 #define bfd_elf32_bfd_set_private_flags mcore_elf_set_private_flags
685 #define bfd_elf32_bfd_reloc_type_lookup mcore_elf_reloc_type_lookup
686 #define elf_backend_relocate_section mcore_elf_relocate_section
687 #define elf_backend_gc_mark_hook mcore_elf_gc_mark_hook
688 #define elf_backend_gc_sweep_hook mcore_elf_gc_sweep_hook
689 #define elf_backend_check_relocs mcore_elf_check_relocs
690 #define elf_backend_special_sections mcore_elf_special_sections
691
692 #define elf_backend_can_gc_sections 1
693 #define elf_backend_rela_normal 1
694
695 #include "elf32-target.h"
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