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Use bfd_generic_verify_endian_match() and fix it to only check when endianness
[binutils.git] / bfd / elf32-mcore.c
blob7e0c30c6cd8e25e8873f0104836dc78ff931e130
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 /*ARGSUSED*/
354 static bfd_reloc_status_type
355 mcore_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
356 output_bfd, error_message)
357 bfd * abfd;
358 arelent * reloc_entry;
359 asymbol * symbol ATTRIBUTE_UNUSED;
360 PTR data ATTRIBUTE_UNUSED;
361 asection * input_section ATTRIBUTE_UNUSED;
362 bfd * output_bfd ATTRIBUTE_UNUSED;
363 char ** error_message ATTRIBUTE_UNUSED;
364 {
365 BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
366
367 _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"),
368 bfd_get_filename (abfd),
369 reloc_entry->howto->name,
370 reloc_entry->howto->type);
371
372 return bfd_reloc_notsupported;
373 }
374
375 \f
376 /* The RELOCATE_SECTION function is called by the ELF backend linker
377 to handle the relocations for a section.
378
379 The relocs are always passed as Rela structures; if the section
380 actually uses Rel structures, the r_addend field will always be
381 zero.
382
383 This function is responsible for adjust the section contents as
384 necessary, and (if using Rela relocs and generating a
385 relocateable output file) adjusting the reloc addend as
386 necessary.
387
388 This function does not have to worry about setting the reloc
389 address or the reloc symbol index.
390
391 LOCAL_SYMS is a pointer to the swapped in local symbols.
392
393 LOCAL_SECTIONS is an array giving the section in the input file
394 corresponding to the st_shndx field of each local symbol.
395
396 The global hash table entry for the global symbols can be found
397 via elf_sym_hashes (input_bfd).
398
399 When generating relocateable output, this function must handle
400 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
401 going to be the section symbol corresponding to the output
402 section, which means that the addend must be adjusted
403 accordingly. */
404
405 static boolean
406 mcore_elf_relocate_section (output_bfd, info, input_bfd, input_section,
407 contents, relocs, local_syms, local_sections)
408 bfd * output_bfd ATTRIBUTE_UNUSED;
409 struct bfd_link_info * info;
410 bfd * input_bfd;
411 asection * input_section;
412 bfd_byte * contents;
413 Elf_Internal_Rela * relocs;
414 Elf_Internal_Sym * local_syms;
415 asection ** local_sections;
416 {
417 Elf_Internal_Shdr * symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
418 struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd);
419 Elf_Internal_Rela * rel = relocs;
420 Elf_Internal_Rela * relend = relocs + input_section->reloc_count;
421 boolean ret = true;
422
423 #ifdef DEBUG
424 fprintf (stderr,
425 "mcore_elf_relocate_section called for %s section %s, %ld relocations%s\n",
426 bfd_get_filename (input_bfd),
427 bfd_section_name(input_bfd, input_section),
428 (long) input_section->reloc_count,
429 (info->relocateable) ? " (relocatable)" : "");
430 #endif
431
432 if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */
433 mcore_elf_howto_init ();
434
435 for (; rel < relend; rel++)
436 {
437 enum elf_mcore_reloc_type r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info);
438 bfd_vma offset = rel->r_offset;
439 bfd_vma addend = rel->r_addend;
440 bfd_reloc_status_type r = bfd_reloc_other;
441 asection * sec = (asection *) 0;
442 reloc_howto_type * howto;
443 bfd_vma relocation;
444 Elf_Internal_Sym * sym = (Elf_Internal_Sym *) 0;
445 unsigned long r_symndx;
446 struct elf_link_hash_entry * h = (struct elf_link_hash_entry *) 0;
447 unsigned short oldinst = 0;
448
449 /* Unknown relocation handling */
450 if ((unsigned) r_type >= (unsigned) R_MCORE_max
451 || ! mcore_elf_howto_table [(int)r_type])
452 {
453 _bfd_error_handler (_("%s: Unknown relocation type %d\n"),
454 bfd_get_filename (input_bfd),
455 (int) r_type);
456
457 bfd_set_error (bfd_error_bad_value);
458 ret = false;
459 continue;
460 }
461
462 howto = mcore_elf_howto_table [(int) r_type];
463 r_symndx = ELF32_R_SYM (rel->r_info);
464
465 if (info->relocateable)
466 {
467 /* This is a relocateable link. We don't have to change
468 anything, unless the reloc is against a section symbol,
469 in which case we have to adjust according to where the
470 section symbol winds up in the output section. */
471 if (r_symndx < symtab_hdr->sh_info)
472 {
473 sym = local_syms + r_symndx;
474
475 if ((unsigned)ELF_ST_TYPE (sym->st_info) == STT_SECTION)
476 {
477 sec = local_sections[r_symndx];
478 addend = rel->r_addend += sec->output_offset + sym->st_value;
479 }
480 }
481
482 #ifdef DEBUG
483 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
484 howto->name, (int) r_type, r_symndx, (long) offset, (long) addend);
485 #endif
486 continue;
487 }
488
489 /* This is a final link. */
490
491 /* Complain about known relocation that are not yet supported */
492 if (howto->special_function == mcore_elf_unsupported_reloc)
493 {
494 _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"),
495 bfd_get_filename (input_bfd),
496 howto->name,
497 (int)r_type);
498
499 bfd_set_error (bfd_error_bad_value);
500 ret = false;
501 continue;
502 }
503
504 if (r_symndx < symtab_hdr->sh_info)
505 {
506 sym = local_syms + r_symndx;
507 sec = local_sections [r_symndx];
508 relocation = (sec->output_section->vma
509 + sec->output_offset
510 + sym->st_value);
511 }
512 else
513 {
514 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
515 if ( h->root.type == bfd_link_hash_defined
516 || h->root.type == bfd_link_hash_defweak)
517 {
518 sec = h->root.u.def.section;
519 relocation = (h->root.u.def.value
520 + sec->output_section->vma
521 + sec->output_offset);
522 }
523 else if (h->root.type == bfd_link_hash_undefweak)
524 relocation = 0;
525 else if (info->shared)
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
552 #ifdef DEBUG
553 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
554 howto->name, r_type, r_symndx, (long) offset, (long) addend);
555 #endif
556
557 r = _bfd_final_link_relocate
558 (howto, input_bfd, input_section, contents, offset, relocation, addend);
559
560 if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2)
561 {
562 /* Wasn't ok, back it out and give up. */
563 bfd_put_16 (input_bfd, oldinst, contents + offset);
564 r = bfd_reloc_ok;
565 }
566
567 if (r != bfd_reloc_ok)
568 {
569 ret = false;
570
571 switch (r)
572 {
573 default:
574 break;
575
576 case bfd_reloc_overflow:
577 {
578 const char * name;
579
580 if (h != NULL)
581 name = h->root.root.string;
582 else
583 {
584 name = bfd_elf_string_from_elf_section
585 (input_bfd, symtab_hdr->sh_link, sym->st_name);
586
587 if (name == NULL)
588 break;
589
590 if (* name == '\0')
591 name = bfd_section_name (input_bfd, sec);
592 }
593
594 (*info->callbacks->reloc_overflow)
595 (info, name, howto->name, (bfd_vma) 0, input_bfd, input_section,
596 offset);
597 }
598 break;
599 }
600 }
601 }
602
603 #ifdef DEBUG
604 fprintf (stderr, "\n");
605 #endif
606
607 return ret;
608 }
609 \f
610 /* Return the section that should be marked against GC for a given
611 relocation. */
612
613 static asection *
614 mcore_elf_gc_mark_hook (abfd, info, rel, h, sym)
615 bfd * abfd;
616 struct bfd_link_info * info ATTRIBUTE_UNUSED;
617 Elf_Internal_Rela * rel;
618 struct elf_link_hash_entry * h;
619 Elf_Internal_Sym * sym;
620 {
621 if (h != NULL)
622 {
623 switch (ELF32_R_TYPE (rel->r_info))
624 {
625 case R_MCORE_GNU_VTINHERIT:
626 case R_MCORE_GNU_VTENTRY:
627 break;
628
629 default:
630 switch (h->root.type)
631 {
632 case bfd_link_hash_defined:
633 case bfd_link_hash_defweak:
634 return h->root.u.def.section;
635
636 case bfd_link_hash_common:
637 return h->root.u.c.p->section;
638
639 default:
640 break;
641 }
642 }
643 }
644 else
645 {
646 if (!(elf_bad_symtab (abfd)
647 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
648 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
649 && sym->st_shndx != SHN_COMMON))
650 {
651 return bfd_section_from_elf_index (abfd, sym->st_shndx);
652 }
653 }
654
655 return NULL;
656 }
657
658 /* Update the got entry reference counts for the section being removed. */
659
660 static boolean
661 mcore_elf_gc_sweep_hook (abfd, info, sec, relocs)
662 bfd * abfd ATTRIBUTE_UNUSED;
663 struct bfd_link_info * info ATTRIBUTE_UNUSED;
664 asection * sec ATTRIBUTE_UNUSED;
665 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
666 {
667 return true;
668 }
669
670 /* Look through the relocs for a section during the first phase.
671 Since we don't do .gots or .plts, we just need to consider the
672 virtual table relocs for gc. */
673
674 static boolean
675 mcore_elf_check_relocs (abfd, info, sec, relocs)
676 bfd * abfd;
677 struct bfd_link_info * info;
678 asection * sec;
679 const Elf_Internal_Rela * relocs;
680 {
681 Elf_Internal_Shdr * symtab_hdr;
682 struct elf_link_hash_entry ** sym_hashes;
683 struct elf_link_hash_entry ** sym_hashes_end;
684 const Elf_Internal_Rela * rel;
685 const Elf_Internal_Rela * rel_end;
686
687 if (info->relocateable)
688 return true;
689
690 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
691 sym_hashes = elf_sym_hashes (abfd);
692 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
693 if (!elf_bad_symtab (abfd))
694 sym_hashes_end -= symtab_hdr->sh_info;
695
696 rel_end = relocs + sec->reloc_count;
697
698 for (rel = relocs; rel < rel_end; rel++)
699 {
700 struct elf_link_hash_entry * h;
701 unsigned long r_symndx;
702
703 r_symndx = ELF32_R_SYM (rel->r_info);
704
705 if (r_symndx < symtab_hdr->sh_info)
706 h = NULL;
707 else
708 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
709
710 switch (ELF32_R_TYPE (rel->r_info))
711 {
712 /* This relocation describes the C++ object vtable hierarchy.
713 Reconstruct it for later use during GC. */
714 case R_MCORE_GNU_VTINHERIT:
715 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
716 return false;
717 break;
718
719 /* This relocation describes which C++ vtable entries are actually
720 used. Record for later use during GC. */
721 case R_MCORE_GNU_VTENTRY:
722 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
723 return false;
724 break;
725 }
726 }
727
728 return true;
729 }
730
731 #define TARGET_BIG_SYM bfd_elf32_mcore_big_vec
732 #define TARGET_BIG_NAME "elf32-mcore-big"
733 #define TARGET_LITTLE_SYM bfd_elf32_mcore_little_vec
734 #define TARGET_LITTLE_NAME "elf32-mcore-little"
735
736 #define ELF_ARCH bfd_arch_mcore
737 #define ELF_MACHINE_CODE EM_MCORE
738 #define ELF_MAXPAGESIZE 0x1000 /* 4k, if we ever have 'em */
739 #define elf_info_to_howto mcore_elf_info_to_howto
740 #define elf_info_to_howto_rel NULL
741
742
743 #define bfd_elf32_bfd_copy_private_bfd_data mcore_elf_copy_private_bfd_data
744 #define bfd_elf32_bfd_merge_private_bfd_data mcore_elf_merge_private_bfd_data
745 #define bfd_elf32_bfd_set_private_flags mcore_elf_set_private_flags
746 #define bfd_elf32_bfd_reloc_type_lookup mcore_elf_reloc_type_lookup
747 #define elf_backend_relocate_section mcore_elf_relocate_section
748 #define elf_backend_gc_mark_hook mcore_elf_gc_mark_hook
749 #define elf_backend_gc_sweep_hook mcore_elf_gc_sweep_hook
750 #define elf_backend_check_relocs mcore_elf_check_relocs
751
752 #define elf_backend_can_gc_sections 1
753
754 #include "elf32-target.h"
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