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[binutils.git] / bfd / elf32-mcore.c
blob6bb2e758ef89d1074d1f5872bde25e39b5676413
1 /* Motorola MCore specific support for 32-bit ELF
2 Copyright 1994, 1995, 1999 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19
20 /* This file is based on a preliminary RCE ELF ABI. The
21 information may not match the final RCE ELF ABI. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "elf/mcore.h"
29 #include <assert.h>
30
31 #define USE_RELA /* Only USE_REL is actually significant, but this is
32 here are a reminder... */
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 *, Elf32_Internal_Rela *));
40 static boolean mcore_elf_set_private_flags
41 PARAMS ((bfd *, flagword));
42 static boolean mcore_elf_copy_private_bfd_data
43 PARAMS ((bfd *, bfd *));
44 static boolean mcore_elf_merge_private_bfd_data
45 PARAMS ((bfd *, bfd *));
46 static bfd_reloc_status_type mcore_elf_unsupported_reloc
47 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
48 static boolean mcore_elf_relocate_section
49 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
50 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
51
52 static reloc_howto_type * mcore_elf_howto_table [(int) R_MCORE_max];
53
54 static reloc_howto_type mcore_elf_howto_raw[] =
55 {
56 /* This reloc does nothing. */
57 HOWTO (R_MCORE_NONE, /* type */
58 0, /* rightshift */
59 2, /* size (0 = byte, 1 = short, 2 = long) */
60 32, /* bitsize */
61 false, /* pc_relative */
62 0, /* bitpos */
63 complain_overflow_bitfield, /* complain_on_overflow */
64 NULL, /* special_function */
65 "R_MCORE_NONE", /* name */
66 false, /* partial_inplace */
67 0, /* src_mask */
68 0, /* dst_mask */
69 false), /* pcrel_offset */
70
71 /* A standard 32 bit relocation. */
72 HOWTO (R_MCORE_ADDR32, /* type */
73 0, /* rightshift */
74 2, /* size (0 = byte, 1 = short, 2 = long) */
75 32, /* bitsize */
76 false, /* pc_relative */
77 0, /* bitpos */
78 complain_overflow_bitfield, /* complain_on_overflow */
79 bfd_elf_generic_reloc, /* special_function */
80 "ADDR32", /* name *//* For compatability with coff/pe port. */
81 false, /* partial_inplace */
82 0x0, /* src_mask */
83 0xffffffff, /* dst_mask */
84 false), /* pcrel_offset */
85
86 /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
87 Should not appear in object files. */
88 HOWTO (R_MCORE_PCRELIMM8BY4, /* type */
89 2, /* rightshift */
90 1, /* size (0 = byte, 1 = short, 2 = long) */
91 8, /* bitsize */
92 true, /* pc_relative */
93 0, /* bitpos */
94 complain_overflow_bitfield, /* complain_on_overflow */
95 mcore_elf_unsupported_reloc, /* special_function */
96 "R_MCORE_PCRELIMM8BY4",/* name */
97 false, /* partial_inplace */
98 0, /* src_mask */
99 0, /* dst_mask */
100 true), /* pcrel_offset */
101
102 /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
103 Span 2k instructions == 4k bytes.
104 Only useful pieces at the relocated address are the opcode (5 bits) */
105 HOWTO (R_MCORE_PCRELIMM11BY2,/* type */
106 1, /* rightshift */
107 1, /* size (0 = byte, 1 = short, 2 = long) */
108 11, /* bitsize */
109 true, /* pc_relative */
110 0, /* bitpos */
111 complain_overflow_signed, /* complain_on_overflow */
112 bfd_elf_generic_reloc, /* special_function */
113 "R_MCORE_PCRELIMM11BY2",/* name */
114 false, /* partial_inplace */
115 0x0, /* src_mask */
116 0x7ff, /* dst_mask */
117 true), /* pcrel_offset */
118
119 /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */
120 HOWTO (R_MCORE_PCRELIMM4BY2, /* type */
121 1, /* rightshift */
122 1, /* size (0 = byte, 1 = short, 2 = long) */
123 4, /* bitsize */
124 true, /* pc_relative */
125 0, /* bitpos */
126 complain_overflow_bitfield, /* complain_on_overflow */
127 mcore_elf_unsupported_reloc,/* special_function */
128 "R_MCORE_PCRELIMM4BY2",/* name */
129 false, /* partial_inplace */
130 0, /* src_mask */
131 0, /* dst_mask */
132 true), /* pcrel_offset */
133
134 /* 32-bit pc-relative. Eventually this will help support PIC code. */
135 HOWTO (R_MCORE_PCREL32, /* type */
136 0, /* rightshift */
137 2, /* size (0 = byte, 1 = short, 2 = long) */
138 32, /* bitsize */
139 true, /* pc_relative */
140 0, /* bitpos */
141 complain_overflow_bitfield, /* complain_on_overflow */
142 bfd_elf_generic_reloc, /* special_function */
143 "R_MCORE_PCREL32", /* name */
144 false, /* partial_inplace */
145 0x0, /* src_mask */
146 0xffffffff, /* dst_mask */
147 true), /* pcrel_offset */
148
149 /* Like PCRELIMM11BY2, this relocation indicates that there is a
150 'jsri' at the specified address. There is a separate relocation
151 entry for the literal pool entry that it references, but we
152 might be able to change the jsri to a bsr if the target turns out
153 to be close enough [even though we won't reclaim the literal pool
154 entry, we'll get some runtime efficiency back]. Note that this
155 is a relocation that we are allowed to safely ignore. */
156 HOWTO (R_MCORE_PCRELJSR_IMM11BY2,/* type */
157 1, /* rightshift */
158 1, /* size (0 = byte, 1 = short, 2 = long) */
159 11, /* bitsize */
160 true, /* pc_relative */
161 0, /* bitpos */
162 complain_overflow_signed, /* complain_on_overflow */
163 bfd_elf_generic_reloc, /* special_function */
164 "R_MCORE_PCRELJSR_IMM11BY2", /* name */
165 false, /* partial_inplace */
166 0x0, /* src_mask */
167 0x7ff, /* dst_mask */
168 true), /* pcrel_offset */
169
170 /* GNU extension to record C++ vtable hierarchy */
171 HOWTO (R_MCORE_GNU_VTINHERIT, /* type */
172 0, /* rightshift */
173 2, /* size (0 = byte, 1 = short, 2 = long) */
174 0, /* bitsize */
175 false, /* pc_relative */
176 0, /* bitpos */
177 complain_overflow_dont, /* complain_on_overflow */
178 NULL, /* special_function */
179 "R_MCORE_GNU_VTINHERIT", /* name */
180 false, /* partial_inplace */
181 0, /* src_mask */
182 0, /* dst_mask */
183 false), /* pcrel_offset */
184
185 /* GNU extension to record C++ vtable member usage */
186 HOWTO (R_MCORE_GNU_VTENTRY, /* type */
187 0, /* rightshift */
188 2, /* size (0 = byte, 1 = short, 2 = long) */
189 0, /* bitsize */
190 false, /* pc_relative */
191 0, /* bitpos */
192 complain_overflow_dont,/* complain_on_overflow */
193 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
194 "R_MCORE_GNU_VTENTRY", /* name */
195 false, /* partial_inplace */
196 0, /* src_mask */
197 0, /* dst_mask */
198 false), /* pcrel_offset */
199
200 HOWTO (R_MCORE_RELATIVE, /* type */
201 0, /* rightshift */
202 2, /* size (0 = byte, 1 = short, 2 = long) */
203 32, /* bitsize */
204 false, /* pc_relative */
205 0, /* bitpos */
206 complain_overflow_signed, /* complain_on_overflow */
207 NULL, /* special_function */
208 "R_MCORE_RELATIVE", /* name */
209 true, /* partial_inplace */
210 0xffffffff, /* src_mask */
211 0xffffffff, /* dst_mask */
212 false) /* pcrel_offset */
213 };
214
215 #ifndef NUM_ELEM
216 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
217 #endif
218 \f
219 /* Initialize the mcore_elf_howto_table, so that linear accesses can be done. */
220 static void
221 mcore_elf_howto_init ()
222 {
223 unsigned int i;
224
225 for (i = NUM_ELEM (mcore_elf_howto_raw); i--;)
226 {
227 unsigned int type;
228
229 type = mcore_elf_howto_raw[i].type;
230
231 BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table));
232
233 mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i];
234 }
235 }
236
237 \f
238 static reloc_howto_type *
239 mcore_elf_reloc_type_lookup (abfd, code)
240 bfd * abfd ATTRIBUTE_UNUSED;
241 bfd_reloc_code_real_type code;
242 {
243 enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE;
244
245 switch (code)
246 {
247 case BFD_RELOC_NONE: mcore_reloc = R_MCORE_NONE; break;
248 case BFD_RELOC_32: mcore_reloc = R_MCORE_ADDR32; break;
249 case BFD_RELOC_MCORE_PCREL_IMM8BY4: mcore_reloc = R_MCORE_PCRELIMM8BY4; break;
250 case BFD_RELOC_MCORE_PCREL_IMM11BY2: mcore_reloc = R_MCORE_PCRELIMM11BY2; break;
251 case BFD_RELOC_MCORE_PCREL_IMM4BY2: mcore_reloc = R_MCORE_PCRELIMM4BY2; break;
252 case BFD_RELOC_32_PCREL: mcore_reloc = R_MCORE_PCREL32; break;
253 case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break;
254 case BFD_RELOC_VTABLE_INHERIT: mcore_reloc = R_MCORE_GNU_VTINHERIT; break;
255 case BFD_RELOC_VTABLE_ENTRY: mcore_reloc = R_MCORE_GNU_VTENTRY; break;
256 case BFD_RELOC_RVA: mcore_reloc = R_MCORE_RELATIVE; break;
257 default:
258 return (reloc_howto_type *)NULL;
259 }
260
261 if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */
262 mcore_elf_howto_init ();
263
264 return mcore_elf_howto_table [(int) mcore_reloc];
265 };
266
267 /* Set the howto pointer for a RCE ELF reloc. */
268 static void
269 mcore_elf_info_to_howto (abfd, cache_ptr, dst)
270 bfd * abfd ATTRIBUTE_UNUSED;
271 arelent * cache_ptr;
272 Elf32_Internal_Rela * dst;
273 {
274 if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */
275 mcore_elf_howto_init ();
276
277 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_MCORE_max);
278
279 cache_ptr->howto = mcore_elf_howto_table [ELF32_R_TYPE (dst->r_info)];
280 }
281
282 /* Function to set whether a module needs the -mrelocatable bit set. */
283 static boolean
284 mcore_elf_set_private_flags (abfd, flags)
285 bfd * abfd;
286 flagword flags;
287 {
288 BFD_ASSERT (! elf_flags_init (abfd)
289 || elf_elfheader (abfd)->e_flags == flags);
290
291 elf_elfheader (abfd)->e_flags = flags;
292 elf_flags_init (abfd) = true;
293 return true;
294 }
295
296 /* Copy backend specific data from one object module to another. */
297 static boolean
298 mcore_elf_copy_private_bfd_data (ibfd, obfd)
299 bfd * ibfd;
300 bfd * obfd;
301 {
302 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
303 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
304 return true;
305
306 BFD_ASSERT (! elf_flags_init (obfd)
307 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
308
309 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
310 elf_flags_init (obfd) = true;
311 return true;
312 }
313
314 /* Merge backend specific data from an object file to the output
315 object file when linking. */
316 static boolean
317 mcore_elf_merge_private_bfd_data (ibfd, obfd)
318 bfd * ibfd;
319 bfd * obfd;
320 {
321 flagword old_flags;
322 flagword new_flags;
323
324 /* Check if we have the same endianess */
325 if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
326 return false;
327
328 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
329 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
330 return true;
331
332 new_flags = elf_elfheader (ibfd)->e_flags;
333 old_flags = elf_elfheader (obfd)->e_flags;
334
335 if (! elf_flags_init (obfd)) /* First call, no flags set */
336 {
337 elf_flags_init (obfd) = true;
338 elf_elfheader (obfd)->e_flags = new_flags;
339 }
340 else if (new_flags == old_flags) /* Compatible flags are ok */
341 ;
342 else
343 {
344 /* FIXME */
345 }
346
347 return true;
348 }
349
350 \f
351 /* Don't pretend we can deal with unsupported relocs. */
352
353 static bfd_reloc_status_type
354 mcore_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
355 output_bfd, error_message)
356 bfd * abfd;
357 arelent * reloc_entry;
358 asymbol * symbol ATTRIBUTE_UNUSED;
359 PTR data ATTRIBUTE_UNUSED;
360 asection * input_section ATTRIBUTE_UNUSED;
361 bfd * output_bfd ATTRIBUTE_UNUSED;
362 char ** error_message ATTRIBUTE_UNUSED;
363 {
364 BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
365
366 _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"),
367 bfd_get_filename (abfd),
368 reloc_entry->howto->name,
369 reloc_entry->howto->type);
370
371 return bfd_reloc_notsupported;
372 }
373
374 \f
375 /* The RELOCATE_SECTION function is called by the ELF backend linker
376 to handle the relocations for a section.
377
378 The relocs are always passed as Rela structures; if the section
379 actually uses Rel structures, the r_addend field will always be
380 zero.
381
382 This function is responsible for adjust the section contents as
383 necessary, and (if using Rela relocs and generating a
384 relocateable output file) adjusting the reloc addend as
385 necessary.
386
387 This function does not have to worry about setting the reloc
388 address or the reloc symbol index.
389
390 LOCAL_SYMS is a pointer to the swapped in local symbols.
391
392 LOCAL_SECTIONS is an array giving the section in the input file
393 corresponding to the st_shndx field of each local symbol.
394
395 The global hash table entry for the global symbols can be found
396 via elf_sym_hashes (input_bfd).
397
398 When generating relocateable output, this function must handle
399 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
400 going to be the section symbol corresponding to the output
401 section, which means that the addend must be adjusted
402 accordingly. */
403
404 static boolean
405 mcore_elf_relocate_section (output_bfd, info, input_bfd, input_section,
406 contents, relocs, local_syms, local_sections)
407 bfd * output_bfd ATTRIBUTE_UNUSED;
408 struct bfd_link_info * info;
409 bfd * input_bfd;
410 asection * input_section;
411 bfd_byte * contents;
412 Elf_Internal_Rela * relocs;
413 Elf_Internal_Sym * local_syms;
414 asection ** local_sections;
415 {
416 Elf_Internal_Shdr * symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
417 struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd);
418 Elf_Internal_Rela * rel = relocs;
419 Elf_Internal_Rela * relend = relocs + input_section->reloc_count;
420 boolean ret = true;
421
422 #ifdef DEBUG
423 fprintf (stderr,
424 "mcore_elf_relocate_section called for %s section %s, %ld relocations%s\n",
425 bfd_get_filename (input_bfd),
426 bfd_section_name(input_bfd, input_section),
427 (long) input_section->reloc_count,
428 (info->relocateable) ? " (relocatable)" : "");
429 #endif
430
431 if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */
432 mcore_elf_howto_init ();
433
434 for (; rel < relend; rel++)
435 {
436 enum elf_mcore_reloc_type r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info);
437 bfd_vma offset = rel->r_offset;
438 bfd_vma addend = rel->r_addend;
439 bfd_reloc_status_type r = bfd_reloc_other;
440 asection * sec = (asection *) 0;
441 reloc_howto_type * howto;
442 bfd_vma relocation;
443 Elf_Internal_Sym * sym = (Elf_Internal_Sym *) 0;
444 unsigned long r_symndx;
445 struct elf_link_hash_entry * h = (struct elf_link_hash_entry *) 0;
446 unsigned short oldinst = 0;
447
448 /* Unknown relocation handling */
449 if ((unsigned) r_type >= (unsigned) R_MCORE_max
450 || ! mcore_elf_howto_table [(int)r_type])
451 {
452 _bfd_error_handler (_("%s: Unknown relocation type %d\n"),
453 bfd_get_filename (input_bfd),
454 (int) r_type);
455
456 bfd_set_error (bfd_error_bad_value);
457 ret = false;
458 continue;
459 }
460
461 howto = mcore_elf_howto_table [(int) r_type];
462 r_symndx = ELF32_R_SYM (rel->r_info);
463
464 if (info->relocateable)
465 {
466 /* This is a relocateable link. We don't have to change
467 anything, unless the reloc is against a section symbol,
468 in which case we have to adjust according to where the
469 section symbol winds up in the output section. */
470 if (r_symndx < symtab_hdr->sh_info)
471 {
472 sym = local_syms + r_symndx;
473
474 if ((unsigned)ELF_ST_TYPE (sym->st_info) == STT_SECTION)
475 {
476 sec = local_sections[r_symndx];
477 addend = rel->r_addend += sec->output_offset + sym->st_value;
478 }
479 }
480
481 #ifdef DEBUG
482 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
483 howto->name, (int) r_type, r_symndx, (long) offset, (long) addend);
484 #endif
485 continue;
486 }
487
488 /* This is a final link. */
489
490 /* Complain about known relocation that are not yet supported. */
491 if (howto->special_function == mcore_elf_unsupported_reloc)
492 {
493 _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"),
494 bfd_get_filename (input_bfd),
495 howto->name,
496 (int)r_type);
497
498 bfd_set_error (bfd_error_bad_value);
499 ret = false;
500 continue;
501 }
502
503 if (r_symndx < symtab_hdr->sh_info)
504 {
505 sym = local_syms + r_symndx;
506 sec = local_sections [r_symndx];
507 relocation = (sec->output_section->vma
508 + sec->output_offset
509 + sym->st_value);
510 }
511 else
512 {
513 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
514 if ( h->root.type == bfd_link_hash_defined
515 || h->root.type == bfd_link_hash_defweak)
516 {
517 sec = h->root.u.def.section;
518 relocation = (h->root.u.def.value
519 + sec->output_section->vma
520 + sec->output_offset);
521 }
522 else if (h->root.type == bfd_link_hash_undefweak)
523 relocation = 0;
524 else if (info->shared
525 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
526 relocation = 0;
527 else
528 {
529 if (! ((*info->callbacks->undefined_symbol)
530 (info, h->root.root.string, input_bfd,
531 input_section, rel->r_offset, true)))
532 return false;
533
534 ret = false;
535 continue;
536 }
537 }
538
539 switch (r_type)
540 {
541 default:
542 break;
543
544 case R_MCORE_PCRELJSR_IMM11BY2:
545 oldinst = bfd_get_16 (input_bfd, contents + offset);
546 #define MCORE_INST_BSR 0xF800
547 bfd_put_16 (input_bfd, MCORE_INST_BSR, contents + offset);
548 break;
549 }
550
551 #ifdef DEBUG
552 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
553 howto->name, r_type, r_symndx, (long) offset, (long) addend);
554 #endif
555
556 r = _bfd_final_link_relocate
557 (howto, input_bfd, input_section, contents, offset, relocation, addend);
558
559 if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2)
560 {
561 /* Wasn't ok, back it out and give up. */
562 bfd_put_16 (input_bfd, oldinst, contents + offset);
563 r = bfd_reloc_ok;
564 }
565
566 if (r != bfd_reloc_ok)
567 {
568 ret = false;
569
570 switch (r)
571 {
572 default:
573 break;
574
575 case bfd_reloc_overflow:
576 {
577 const char * name;
578
579 if (h != NULL)
580 name = h->root.root.string;
581 else
582 {
583 name = bfd_elf_string_from_elf_section
584 (input_bfd, symtab_hdr->sh_link, sym->st_name);
585
586 if (name == NULL)
587 break;
588
589 if (* name == '\0')
590 name = bfd_section_name (input_bfd, sec);
591 }
592
593 (*info->callbacks->reloc_overflow)
594 (info, name, howto->name, (bfd_vma) 0, input_bfd, input_section,
595 offset);
596 }
597 break;
598 }
599 }
600 }
601
602 #ifdef DEBUG
603 fprintf (stderr, "\n");
604 #endif
605
606 return ret;
607 }
608 \f
609 /* Return the section that should be marked against GC for a given
610 relocation. */
611
612 static asection *
613 mcore_elf_gc_mark_hook (abfd, info, rel, h, sym)
614 bfd * abfd;
615 struct bfd_link_info * info ATTRIBUTE_UNUSED;
616 Elf_Internal_Rela * rel;
617 struct elf_link_hash_entry * h;
618 Elf_Internal_Sym * sym;
619 {
620 if (h != NULL)
621 {
622 switch (ELF32_R_TYPE (rel->r_info))
623 {
624 case R_MCORE_GNU_VTINHERIT:
625 case R_MCORE_GNU_VTENTRY:
626 break;
627
628 default:
629 switch (h->root.type)
630 {
631 case bfd_link_hash_defined:
632 case bfd_link_hash_defweak:
633 return h->root.u.def.section;
634
635 case bfd_link_hash_common:
636 return h->root.u.c.p->section;
637
638 default:
639 break;
640 }
641 }
642 }
643 else
644 {
645 if (!(elf_bad_symtab (abfd)
646 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
647 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
648 && sym->st_shndx != SHN_COMMON))
649 {
650 return bfd_section_from_elf_index (abfd, sym->st_shndx);
651 }
652 }
653
654 return NULL;
655 }
656
657 /* Update the got entry reference counts for the section being removed. */
658
659 static boolean
660 mcore_elf_gc_sweep_hook (abfd, info, sec, relocs)
661 bfd * abfd ATTRIBUTE_UNUSED;
662 struct bfd_link_info * info ATTRIBUTE_UNUSED;
663 asection * sec ATTRIBUTE_UNUSED;
664 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
665 {
666 return true;
667 }
668
669 /* Look through the relocs for a section during the first phase.
670 Since we don't do .gots or .plts, we just need to consider the
671 virtual table relocs for gc. */
672
673 static boolean
674 mcore_elf_check_relocs (abfd, info, sec, relocs)
675 bfd * abfd;
676 struct bfd_link_info * info;
677 asection * sec;
678 const Elf_Internal_Rela * relocs;
679 {
680 Elf_Internal_Shdr * symtab_hdr;
681 struct elf_link_hash_entry ** sym_hashes;
682 struct elf_link_hash_entry ** sym_hashes_end;
683 const Elf_Internal_Rela * rel;
684 const Elf_Internal_Rela * rel_end;
685
686 if (info->relocateable)
687 return true;
688
689 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
690 sym_hashes = elf_sym_hashes (abfd);
691 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
692 if (!elf_bad_symtab (abfd))
693 sym_hashes_end -= symtab_hdr->sh_info;
694
695 rel_end = relocs + sec->reloc_count;
696
697 for (rel = relocs; rel < rel_end; rel++)
698 {
699 struct elf_link_hash_entry * h;
700 unsigned long r_symndx;
701
702 r_symndx = ELF32_R_SYM (rel->r_info);
703
704 if (r_symndx < symtab_hdr->sh_info)
705 h = NULL;
706 else
707 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
708
709 switch (ELF32_R_TYPE (rel->r_info))
710 {
711 /* This relocation describes the C++ object vtable hierarchy.
712 Reconstruct it for later use during GC. */
713 case R_MCORE_GNU_VTINHERIT:
714 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
715 return false;
716 break;
717
718 /* This relocation describes which C++ vtable entries are actually
719 used. Record for later use during GC. */
720 case R_MCORE_GNU_VTENTRY:
721 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
722 return false;
723 break;
724 }
725 }
726
727 return true;
728 }
729
730 #define TARGET_BIG_SYM bfd_elf32_mcore_big_vec
731 #define TARGET_BIG_NAME "elf32-mcore-big"
732 #define TARGET_LITTLE_SYM bfd_elf32_mcore_little_vec
733 #define TARGET_LITTLE_NAME "elf32-mcore-little"
734
735 #define ELF_ARCH bfd_arch_mcore
736 #define ELF_MACHINE_CODE EM_MCORE
737 #define ELF_MAXPAGESIZE 0x1000 /* 4k, if we ever have 'em */
738 #define elf_info_to_howto mcore_elf_info_to_howto
739 #define elf_info_to_howto_rel NULL
740
741 #define bfd_elf32_bfd_copy_private_bfd_data mcore_elf_copy_private_bfd_data
742 #define bfd_elf32_bfd_merge_private_bfd_data mcore_elf_merge_private_bfd_data
743 #define bfd_elf32_bfd_set_private_flags mcore_elf_set_private_flags
744 #define bfd_elf32_bfd_reloc_type_lookup mcore_elf_reloc_type_lookup
745 #define elf_backend_relocate_section mcore_elf_relocate_section
746 #define elf_backend_gc_mark_hook mcore_elf_gc_mark_hook
747 #define elf_backend_gc_sweep_hook mcore_elf_gc_sweep_hook
748 #define elf_backend_check_relocs mcore_elf_check_relocs
749
750 #define elf_backend_can_gc_sections 1
751
752 #include "elf32-target.h"
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