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file sysinfo.h was initially added on branch binutils-2_10-branch.
[binutils.git] / bfd / elf32-mcore.c
blob99e9c73596e6a9b75da947294ffdb26455c60bf2
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 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
527 relocation = 0;
528 else
529 {
530 if (! ((*info->callbacks->undefined_symbol)
531 (info, h->root.root.string, input_bfd,
532 input_section, rel->r_offset, true)))
533 return false;
534
535 ret = false;
536 continue;
537 }
538 }
539
540 switch (r_type)
541 {
542 default:
543 break;
544
545 case R_MCORE_PCRELJSR_IMM11BY2:
546 oldinst = bfd_get_16 (input_bfd, contents + offset);
547 #define MCORE_INST_BSR 0xF800
548 bfd_put_16 (input_bfd, MCORE_INST_BSR, contents + offset);
549 break;
550 }
551
552
553 #ifdef DEBUG
554 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
555 howto->name, r_type, r_symndx, (long) offset, (long) addend);
556 #endif
557
558 r = _bfd_final_link_relocate
559 (howto, input_bfd, input_section, contents, offset, relocation, addend);
560
561 if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2)
562 {
563 /* Wasn't ok, back it out and give up. */
564 bfd_put_16 (input_bfd, oldinst, contents + offset);
565 r = bfd_reloc_ok;
566 }
567
568 if (r != bfd_reloc_ok)
569 {
570 ret = false;
571
572 switch (r)
573 {
574 default:
575 break;
576
577 case bfd_reloc_overflow:
578 {
579 const char * name;
580
581 if (h != NULL)
582 name = h->root.root.string;
583 else
584 {
585 name = bfd_elf_string_from_elf_section
586 (input_bfd, symtab_hdr->sh_link, sym->st_name);
587
588 if (name == NULL)
589 break;
590
591 if (* name == '\0')
592 name = bfd_section_name (input_bfd, sec);
593 }
594
595 (*info->callbacks->reloc_overflow)
596 (info, name, howto->name, (bfd_vma) 0, input_bfd, input_section,
597 offset);
598 }
599 break;
600 }
601 }
602 }
603
604 #ifdef DEBUG
605 fprintf (stderr, "\n");
606 #endif
607
608 return ret;
609 }
610 \f
611 /* Return the section that should be marked against GC for a given
612 relocation. */
613
614 static asection *
615 mcore_elf_gc_mark_hook (abfd, info, rel, h, sym)
616 bfd * abfd;
617 struct bfd_link_info * info ATTRIBUTE_UNUSED;
618 Elf_Internal_Rela * rel;
619 struct elf_link_hash_entry * h;
620 Elf_Internal_Sym * sym;
621 {
622 if (h != NULL)
623 {
624 switch (ELF32_R_TYPE (rel->r_info))
625 {
626 case R_MCORE_GNU_VTINHERIT:
627 case R_MCORE_GNU_VTENTRY:
628 break;
629
630 default:
631 switch (h->root.type)
632 {
633 case bfd_link_hash_defined:
634 case bfd_link_hash_defweak:
635 return h->root.u.def.section;
636
637 case bfd_link_hash_common:
638 return h->root.u.c.p->section;
639
640 default:
641 break;
642 }
643 }
644 }
645 else
646 {
647 if (!(elf_bad_symtab (abfd)
648 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
649 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
650 && sym->st_shndx != SHN_COMMON))
651 {
652 return bfd_section_from_elf_index (abfd, sym->st_shndx);
653 }
654 }
655
656 return NULL;
657 }
658
659 /* Update the got entry reference counts for the section being removed. */
660
661 static boolean
662 mcore_elf_gc_sweep_hook (abfd, info, sec, relocs)
663 bfd * abfd ATTRIBUTE_UNUSED;
664 struct bfd_link_info * info ATTRIBUTE_UNUSED;
665 asection * sec ATTRIBUTE_UNUSED;
666 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
667 {
668 return true;
669 }
670
671 /* Look through the relocs for a section during the first phase.
672 Since we don't do .gots or .plts, we just need to consider the
673 virtual table relocs for gc. */
674
675 static boolean
676 mcore_elf_check_relocs (abfd, info, sec, relocs)
677 bfd * abfd;
678 struct bfd_link_info * info;
679 asection * sec;
680 const Elf_Internal_Rela * relocs;
681 {
682 Elf_Internal_Shdr * symtab_hdr;
683 struct elf_link_hash_entry ** sym_hashes;
684 struct elf_link_hash_entry ** sym_hashes_end;
685 const Elf_Internal_Rela * rel;
686 const Elf_Internal_Rela * rel_end;
687
688 if (info->relocateable)
689 return true;
690
691 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
692 sym_hashes = elf_sym_hashes (abfd);
693 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
694 if (!elf_bad_symtab (abfd))
695 sym_hashes_end -= symtab_hdr->sh_info;
696
697 rel_end = relocs + sec->reloc_count;
698
699 for (rel = relocs; rel < rel_end; rel++)
700 {
701 struct elf_link_hash_entry * h;
702 unsigned long r_symndx;
703
704 r_symndx = ELF32_R_SYM (rel->r_info);
705
706 if (r_symndx < symtab_hdr->sh_info)
707 h = NULL;
708 else
709 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
710
711 switch (ELF32_R_TYPE (rel->r_info))
712 {
713 /* This relocation describes the C++ object vtable hierarchy.
714 Reconstruct it for later use during GC. */
715 case R_MCORE_GNU_VTINHERIT:
716 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
717 return false;
718 break;
719
720 /* This relocation describes which C++ vtable entries are actually
721 used. Record for later use during GC. */
722 case R_MCORE_GNU_VTENTRY:
723 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
724 return false;
725 break;
726 }
727 }
728
729 return true;
730 }
731
732 #define TARGET_BIG_SYM bfd_elf32_mcore_big_vec
733 #define TARGET_BIG_NAME "elf32-mcore-big"
734 #define TARGET_LITTLE_SYM bfd_elf32_mcore_little_vec
735 #define TARGET_LITTLE_NAME "elf32-mcore-little"
736
737 #define ELF_ARCH bfd_arch_mcore
738 #define ELF_MACHINE_CODE EM_MCORE
739 #define ELF_MAXPAGESIZE 0x1000 /* 4k, if we ever have 'em */
740 #define elf_info_to_howto mcore_elf_info_to_howto
741 #define elf_info_to_howto_rel NULL
742
743
744 #define bfd_elf32_bfd_copy_private_bfd_data mcore_elf_copy_private_bfd_data
745 #define bfd_elf32_bfd_merge_private_bfd_data mcore_elf_merge_private_bfd_data
746 #define bfd_elf32_bfd_set_private_flags mcore_elf_set_private_flags
747 #define bfd_elf32_bfd_reloc_type_lookup mcore_elf_reloc_type_lookup
748 #define elf_backend_relocate_section mcore_elf_relocate_section
749 #define elf_backend_gc_mark_hook mcore_elf_gc_mark_hook
750 #define elf_backend_gc_sweep_hook mcore_elf_gc_sweep_hook
751 #define elf_backend_check_relocs mcore_elf_check_relocs
752
753 #define elf_backend_can_gc_sections 1
754
755 #include "elf32-target.h"
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