1 /* BFD back-end for National Semiconductor's CRX ELF
2 Copyright (C) 2004-2015 Free Software Foundation, Inc.
3 Written by Tomer Levi, NSC, Israel.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
29 static reloc_howto_type *elf_crx_reloc_type_lookup
30 (bfd *, bfd_reloc_code_real_type);
31 static void elf_crx_info_to_howto
32 (bfd *, arelent *, Elf_Internal_Rela *);
33 static bfd_boolean elf32_crx_relax_delete_bytes
34 (struct bfd_link_info *, bfd *, asection *, bfd_vma, int);
35 static bfd_reloc_status_type crx_elf_final_link_relocate
36 (reloc_howto_type *, bfd *, bfd *, asection *,
37 bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
38 struct bfd_link_info *, asection *, int);
39 static bfd_boolean elf32_crx_relocate_section
40 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
41 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
42 static bfd_boolean elf32_crx_relax_section
43 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
44 static bfd_byte * elf32_crx_get_relocated_section_contents
45 (bfd *, struct bfd_link_info *, struct bfd_link_order *,
46 bfd_byte *, bfd_boolean, asymbol **);
48 /* crx_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */
52 bfd_reloc_code_real_type bfd_reloc_enum; /* BFD relocation enum. */
53 unsigned short crx_reloc_type; /* CRX relocation type. */
56 static const struct crx_reloc_map crx_reloc_map[R_CRX_MAX] =
58 {BFD_RELOC_NONE, R_CRX_NONE},
59 {BFD_RELOC_CRX_REL4, R_CRX_REL4},
60 {BFD_RELOC_CRX_REL8, R_CRX_REL8},
61 {BFD_RELOC_CRX_REL8_CMP, R_CRX_REL8_CMP},
62 {BFD_RELOC_CRX_REL16, R_CRX_REL16},
63 {BFD_RELOC_CRX_REL24, R_CRX_REL24},
64 {BFD_RELOC_CRX_REL32, R_CRX_REL32},
65 {BFD_RELOC_CRX_REGREL12, R_CRX_REGREL12},
66 {BFD_RELOC_CRX_REGREL22, R_CRX_REGREL22},
67 {BFD_RELOC_CRX_REGREL28, R_CRX_REGREL28},
68 {BFD_RELOC_CRX_REGREL32, R_CRX_REGREL32},
69 {BFD_RELOC_CRX_ABS16, R_CRX_ABS16},
70 {BFD_RELOC_CRX_ABS32, R_CRX_ABS32},
71 {BFD_RELOC_CRX_NUM8, R_CRX_NUM8},
72 {BFD_RELOC_CRX_NUM16, R_CRX_NUM16},
73 {BFD_RELOC_CRX_NUM32, R_CRX_NUM32},
74 {BFD_RELOC_CRX_IMM16, R_CRX_IMM16},
75 {BFD_RELOC_CRX_IMM32, R_CRX_IMM32},
76 {BFD_RELOC_CRX_SWITCH8, R_CRX_SWITCH8},
77 {BFD_RELOC_CRX_SWITCH16, R_CRX_SWITCH16},
78 {BFD_RELOC_CRX_SWITCH32, R_CRX_SWITCH32}
81 static reloc_howto_type crx_elf_howto_table[] =
83 HOWTO (R_CRX_NONE, /* type */
87 FALSE, /* pc_relative */
89 complain_overflow_dont,/* complain_on_overflow */
90 bfd_elf_generic_reloc, /* special_function */
91 "R_CRX_NONE", /* name */
92 FALSE, /* partial_inplace */
95 FALSE), /* pcrel_offset */
97 HOWTO (R_CRX_REL4, /* type */
101 TRUE, /* pc_relative */
103 complain_overflow_bitfield,/* complain_on_overflow */
104 bfd_elf_generic_reloc, /* special_function */
105 "R_CRX_REL4", /* name */
106 FALSE, /* partial_inplace */
109 FALSE), /* pcrel_offset */
111 HOWTO (R_CRX_REL8, /* type */
115 TRUE, /* pc_relative */
117 complain_overflow_bitfield,/* complain_on_overflow */
118 bfd_elf_generic_reloc, /* special_function */
119 "R_CRX_REL8", /* name */
120 FALSE, /* partial_inplace */
123 FALSE), /* pcrel_offset */
125 HOWTO (R_CRX_REL8_CMP, /* type */
129 TRUE, /* pc_relative */
131 complain_overflow_bitfield,/* complain_on_overflow */
132 bfd_elf_generic_reloc, /* special_function */
133 "R_CRX_REL8_CMP", /* name */
134 FALSE, /* partial_inplace */
137 FALSE), /* pcrel_offset */
139 HOWTO (R_CRX_REL16, /* type */
143 TRUE, /* pc_relative */
145 complain_overflow_bitfield,/* complain_on_overflow */
146 bfd_elf_generic_reloc, /* special_function */
147 "R_CRX_REL16", /* name */
148 FALSE, /* partial_inplace */
150 0xffff, /* dst_mask */
151 FALSE), /* pcrel_offset */
153 HOWTO (R_CRX_REL24, /* type */
157 TRUE, /* pc_relative */
159 complain_overflow_bitfield,/* complain_on_overflow */
160 bfd_elf_generic_reloc, /* special_function */
161 "R_CRX_REL24", /* name */
162 FALSE, /* partial_inplace */
164 0xffffff, /* dst_mask */
165 FALSE), /* pcrel_offset */
167 HOWTO (R_CRX_REL32, /* type */
171 TRUE, /* pc_relative */
173 complain_overflow_bitfield,/* complain_on_overflow */
174 bfd_elf_generic_reloc, /* special_function */
175 "R_CRX_REL32", /* name */
176 FALSE, /* partial_inplace */
178 0xffffffff, /* dst_mask */
179 FALSE), /* pcrel_offset */
181 HOWTO (R_CRX_REGREL12, /* type */
185 FALSE, /* pc_relative */
187 complain_overflow_bitfield,/* complain_on_overflow */
188 bfd_elf_generic_reloc, /* special_function */
189 "R_CRX_REGREL12", /* name */
190 FALSE, /* partial_inplace */
192 0xfff, /* dst_mask */
193 FALSE), /* pcrel_offset */
195 HOWTO (R_CRX_REGREL22, /* type */
199 FALSE, /* pc_relative */
201 complain_overflow_bitfield,/* complain_on_overflow */
202 bfd_elf_generic_reloc, /* special_function */
203 "R_CRX_REGREL22", /* name */
204 FALSE, /* partial_inplace */
206 0x3fffff, /* dst_mask */
207 FALSE), /* pcrel_offset */
209 HOWTO (R_CRX_REGREL28, /* type */
213 FALSE, /* pc_relative */
215 complain_overflow_bitfield,/* complain_on_overflow */
216 bfd_elf_generic_reloc, /* special_function */
217 "R_CRX_REGREL28", /* name */
218 FALSE, /* partial_inplace */
220 0xfffffff, /* dst_mask */
221 FALSE), /* pcrel_offset */
223 HOWTO (R_CRX_REGREL32, /* type */
227 FALSE, /* pc_relative */
229 complain_overflow_bitfield,/* complain_on_overflow */
230 bfd_elf_generic_reloc, /* special_function */
231 "R_CRX_REGREL32", /* name */
232 FALSE, /* partial_inplace */
234 0xffffffff, /* dst_mask */
235 FALSE), /* pcrel_offset */
237 HOWTO (R_CRX_ABS16, /* type */
241 FALSE, /* pc_relative */
243 complain_overflow_bitfield,/* complain_on_overflow */
244 bfd_elf_generic_reloc, /* special_function */
245 "R_CRX_ABS16", /* name */
246 FALSE, /* partial_inplace */
248 0xffff, /* dst_mask */
249 FALSE), /* pcrel_offset */
251 HOWTO (R_CRX_ABS32, /* type */
255 FALSE, /* pc_relative */
257 complain_overflow_bitfield,/* complain_on_overflow */
258 bfd_elf_generic_reloc, /* special_function */
259 "R_CRX_ABS32", /* name */
260 FALSE, /* partial_inplace */
262 0xffffffff, /* dst_mask */
263 FALSE), /* pcrel_offset */
265 HOWTO (R_CRX_NUM8, /* type */
269 FALSE, /* pc_relative */
271 complain_overflow_bitfield,/* complain_on_overflow */
272 bfd_elf_generic_reloc, /* special_function */
273 "R_CRX_NUM8", /* name */
274 FALSE, /* partial_inplace */
277 FALSE), /* pcrel_offset */
279 HOWTO (R_CRX_NUM16, /* type */
283 FALSE, /* pc_relative */
285 complain_overflow_bitfield,/* complain_on_overflow */
286 bfd_elf_generic_reloc, /* special_function */
287 "R_CRX_NUM16", /* name */
288 FALSE, /* partial_inplace */
290 0xffff, /* dst_mask */
291 FALSE), /* pcrel_offset */
293 HOWTO (R_CRX_NUM32, /* type */
297 FALSE, /* pc_relative */
299 complain_overflow_bitfield,/* complain_on_overflow */
300 bfd_elf_generic_reloc, /* special_function */
301 "R_CRX_NUM32", /* name */
302 FALSE, /* partial_inplace */
304 0xffffffff, /* dst_mask */
305 FALSE), /* pcrel_offset */
307 HOWTO (R_CRX_IMM16, /* type */
311 FALSE, /* pc_relative */
313 complain_overflow_bitfield,/* complain_on_overflow */
314 bfd_elf_generic_reloc, /* special_function */
315 "R_CRX_IMM16", /* name */
316 FALSE, /* partial_inplace */
318 0xffff, /* dst_mask */
319 FALSE), /* pcrel_offset */
321 HOWTO (R_CRX_IMM32, /* type */
325 FALSE, /* pc_relative */
327 complain_overflow_bitfield,/* complain_on_overflow */
328 bfd_elf_generic_reloc, /* special_function */
329 "R_CRX_IMM32", /* name */
330 FALSE, /* partial_inplace */
332 0xffffffff, /* dst_mask */
333 FALSE), /* pcrel_offset */
335 /* An 8 bit switch table entry. This is generated for an expression
336 such as ``.byte L1 - L2''. The offset holds the difference
337 between the reloc address and L2. */
338 HOWTO (R_CRX_SWITCH8, /* type */
340 0, /* size (0 = byte, 1 = short, 2 = long) */
342 FALSE, /* pc_relative */
344 complain_overflow_unsigned, /* complain_on_overflow */
345 bfd_elf_generic_reloc, /* special_function */
346 "R_CRX_SWITCH8", /* name */
347 FALSE, /* partial_inplace */
350 TRUE), /* pcrel_offset */
352 /* A 16 bit switch table entry. This is generated for an expression
353 such as ``.word L1 - L2''. The offset holds the difference
354 between the reloc address and L2. */
355 HOWTO (R_CRX_SWITCH16, /* type */
357 1, /* size (0 = byte, 1 = short, 2 = long) */
359 FALSE, /* pc_relative */
361 complain_overflow_unsigned, /* complain_on_overflow */
362 bfd_elf_generic_reloc, /* special_function */
363 "R_CRX_SWITCH16", /* name */
364 FALSE, /* partial_inplace */
366 0xffff, /* dst_mask */
367 TRUE), /* pcrel_offset */
369 /* A 32 bit switch table entry. This is generated for an expression
370 such as ``.long L1 - L2''. The offset holds the difference
371 between the reloc address and L2. */
372 HOWTO (R_CRX_SWITCH32, /* type */
374 2, /* size (0 = byte, 1 = short, 2 = long) */
376 FALSE, /* pc_relative */
378 complain_overflow_unsigned, /* complain_on_overflow */
379 bfd_elf_generic_reloc, /* special_function */
380 "R_CRX_SWITCH32", /* name */
381 FALSE, /* partial_inplace */
383 0xffffffff, /* dst_mask */
384 TRUE) /* pcrel_offset */
387 /* Retrieve a howto ptr using a BFD reloc_code. */
389 static reloc_howto_type *
390 elf_crx_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
391 bfd_reloc_code_real_type code)
395 for (i = 0; i < R_CRX_MAX; i++)
396 if (code == crx_reloc_map[i].bfd_reloc_enum)
397 return &crx_elf_howto_table[crx_reloc_map[i].crx_reloc_type];
399 printf ("This relocation Type is not supported -0x%x\n", code);
403 static reloc_howto_type *
404 elf_crx_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
410 i < sizeof (crx_elf_howto_table) / sizeof (crx_elf_howto_table[0]);
412 if (crx_elf_howto_table[i].name != NULL
413 && strcasecmp (crx_elf_howto_table[i].name, r_name) == 0)
414 return &crx_elf_howto_table[i];
419 /* Retrieve a howto ptr using an internal relocation entry. */
422 elf_crx_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
423 Elf_Internal_Rela *dst)
425 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
426 if (r_type >= R_CRX_MAX)
428 (*_bfd_error_handler) (_("%B: unrecognised CRX reloc number: %d"),
430 bfd_set_error (bfd_error_bad_value);
433 cache_ptr->howto = &crx_elf_howto_table[r_type];
436 /* Perform a relocation as part of a final link. */
438 static bfd_reloc_status_type
439 crx_elf_final_link_relocate (reloc_howto_type *howto, bfd *input_bfd,
440 bfd *output_bfd ATTRIBUTE_UNUSED,
441 asection *input_section, bfd_byte *contents,
442 bfd_vma offset, bfd_vma Rvalue, bfd_vma addend,
443 struct bfd_link_info *info ATTRIBUTE_UNUSED,
444 asection *sec ATTRIBUTE_UNUSED,
445 int is_local ATTRIBUTE_UNUSED)
447 unsigned short r_type = howto->type;
448 bfd_byte *hit_data = contents + offset;
449 bfd_vma reloc_bits, check;
465 /* 'hit_data' is relative to the start of the instruction, not the
466 relocation offset. Advance it to account for the exact offset. */
471 /* This relocation type is used only in 'Branch if Equal to 0'
472 instructions and requires special handling. */
483 /* We only care about the addend, where the difference between
484 expressions is kept. */
491 if (howto->pc_relative)
493 /* Subtract the address of the section containing the location. */
494 Rvalue -= (input_section->output_section->vma
495 + input_section->output_offset);
496 /* Subtract the position of the location within the section. */
500 /* Add in supplied addend. */
503 /* Complain if the bitfield overflows, whether it is considered
504 as signed or unsigned. */
505 check = Rvalue >> howto->rightshift;
507 /* Assumes two's complement. This expression avoids
508 overflow if howto->bitsize is the number of bits in
510 reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
512 if (((bfd_vma) check & ~reloc_bits) != 0
513 && (((bfd_vma) check & ~reloc_bits)
514 != (-(bfd_vma) 1 & ~reloc_bits)))
516 /* The above right shift is incorrect for a signed
517 value. See if turning on the upper bits fixes the
519 if (howto->rightshift && (bfd_signed_vma) Rvalue < 0)
521 check |= ((bfd_vma) - 1
523 >> howto->rightshift));
524 if (((bfd_vma) check & ~reloc_bits)
525 != (-(bfd_vma) 1 & ~reloc_bits))
526 return bfd_reloc_overflow;
529 return bfd_reloc_overflow;
532 /* Drop unwanted bits from the value we are relocating to. */
533 Rvalue >>= (bfd_vma) howto->rightshift;
535 /* Apply dst_mask to select only relocatable part of the insn. */
536 Rvalue &= howto->dst_mask;
541 if (r_type == R_CRX_REL4)
544 Rvalue |= (bfd_get_8 (input_bfd, hit_data) & 0x0f);
547 bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data);
551 if (r_type == R_CRX_REGREL12)
552 Rvalue |= (bfd_get_16 (input_bfd, hit_data) & 0xf000);
554 bfd_put_16 (input_bfd, Rvalue, hit_data);
558 if (r_type == R_CRX_REL24
559 || r_type == R_CRX_REGREL22
560 || r_type == R_CRX_REGREL28)
561 Rvalue |= (((bfd_get_16 (input_bfd, hit_data) << 16) |
562 bfd_get_16 (input_bfd, hit_data + 2)) & ~howto->dst_mask);
564 if (r_type == R_CRX_NUM32 || r_type == R_CRX_SWITCH32)
565 /* Relocation on DATA is purely little-endian, that is, for a
566 multi-byte datum, the lowest address in memory contains the
567 little end of the datum, that is, the least significant byte.
568 Therefore we use BFD's byte Putting functions. */
569 bfd_put_32 (input_bfd, Rvalue, hit_data);
571 /* Relocation on INSTRUCTIONS is different : Instructions are
572 word-addressable, that is, each word itself is arranged according
573 to little-endian convention, whereas the words are arranged with
574 respect to one another in BIG ENDIAN fashion.
575 When there is an immediate value that spans a word boundary, it is
576 split in a big-endian way with respect to the words. */
578 bfd_put_16 (input_bfd, (Rvalue >> 16) & 0xffff, hit_data);
579 bfd_put_16 (input_bfd, Rvalue & 0xffff, hit_data + 2);
584 return bfd_reloc_notsupported;
590 /* Delete some bytes from a section while relaxing. */
593 elf32_crx_relax_delete_bytes (struct bfd_link_info *link_info, bfd *abfd,
594 asection *sec, bfd_vma addr, int count)
596 Elf_Internal_Shdr *symtab_hdr;
597 unsigned int sec_shndx;
599 Elf_Internal_Rela *irel, *irelend;
601 Elf_Internal_Sym *isym;
602 Elf_Internal_Sym *isymend;
603 struct elf_link_hash_entry **sym_hashes;
604 struct elf_link_hash_entry **end_hashes;
605 struct elf_link_hash_entry **start_hashes;
606 unsigned int symcount;
608 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
610 contents = elf_section_data (sec)->this_hdr.contents;
614 irel = elf_section_data (sec)->relocs;
615 irelend = irel + sec->reloc_count;
617 /* Actually delete the bytes. */
618 memmove (contents + addr, contents + addr + count,
619 (size_t) (toaddr - addr - count));
622 /* Adjust all the relocs. */
623 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
625 /* Get the new reloc address. */
626 if ((irel->r_offset > addr
627 && irel->r_offset < toaddr))
628 irel->r_offset -= count;
631 /* Adjust the local symbols defined in this section. */
632 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
633 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
634 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
636 if (isym->st_shndx == sec_shndx
637 && isym->st_value > addr
638 && isym->st_value < toaddr)
640 /* Adjust the addend of SWITCH relocations in this section,
641 which reference this local symbol. */
642 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
644 unsigned long r_symndx;
645 Elf_Internal_Sym *rsym;
646 bfd_vma addsym, subsym;
648 /* Skip if not a SWITCH relocation. */
649 if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH8
650 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH16
651 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH32)
654 r_symndx = ELF32_R_SYM (irel->r_info);
655 rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx;
657 /* Skip if not the local adjusted symbol. */
661 addsym = isym->st_value;
662 subsym = addsym - irel->r_addend;
664 /* Fix the addend only when -->> (addsym > addr >= subsym). */
666 irel->r_addend -= count;
671 isym->st_value -= count;
675 /* Now adjust the global symbols defined in this section. */
676 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
677 - symtab_hdr->sh_info);
678 sym_hashes = start_hashes = elf_sym_hashes (abfd);
679 end_hashes = sym_hashes + symcount;
681 for (; sym_hashes < end_hashes; sym_hashes++)
683 struct elf_link_hash_entry *sym_hash = *sym_hashes;
685 /* The '--wrap SYMBOL' option is causing a pain when the object file,
686 containing the definition of __wrap_SYMBOL, includes a direct
687 call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
688 the same symbol (which is __wrap_SYMBOL), but still exist as two
689 different symbols in 'sym_hashes', we don't want to adjust
690 the global symbol __wrap_SYMBOL twice.
691 This check is only relevant when symbols are being wrapped. */
692 if (link_info->wrap_hash != NULL)
694 struct elf_link_hash_entry **cur_sym_hashes;
696 /* Loop only over the symbols whom been already checked. */
697 for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
700 /* If the current symbol is identical to 'sym_hash', that means
701 the symbol was already adjusted (or at least checked). */
702 if (*cur_sym_hashes == sym_hash)
705 /* Don't adjust the symbol again. */
706 if (cur_sym_hashes < sym_hashes)
710 if ((sym_hash->root.type == bfd_link_hash_defined
711 || sym_hash->root.type == bfd_link_hash_defweak)
712 && sym_hash->root.u.def.section == sec
713 && sym_hash->root.u.def.value > addr
714 && sym_hash->root.u.def.value < toaddr)
715 sym_hash->root.u.def.value -= count;
721 /* This is a version of bfd_generic_get_relocated_section_contents
722 which uses elf32_crx_relocate_section. */
725 elf32_crx_get_relocated_section_contents (bfd *output_bfd,
726 struct bfd_link_info *link_info,
727 struct bfd_link_order *link_order,
729 bfd_boolean relocatable,
732 Elf_Internal_Shdr *symtab_hdr;
733 asection *input_section = link_order->u.indirect.section;
734 bfd *input_bfd = input_section->owner;
735 asection **sections = NULL;
736 Elf_Internal_Rela *internal_relocs = NULL;
737 Elf_Internal_Sym *isymbuf = NULL;
739 /* We only need to handle the case of relaxing, or of having a
740 particular set of section contents, specially. */
742 || elf_section_data (input_section)->this_hdr.contents == NULL)
743 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
748 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
750 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
751 (size_t) input_section->size);
753 if ((input_section->flags & SEC_RELOC) != 0
754 && input_section->reloc_count > 0)
756 Elf_Internal_Sym *isym;
757 Elf_Internal_Sym *isymend;
761 internal_relocs = (_bfd_elf_link_read_relocs
762 (input_bfd, input_section, NULL,
763 (Elf_Internal_Rela *) NULL, FALSE));
764 if (internal_relocs == NULL)
767 if (symtab_hdr->sh_info != 0)
769 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
771 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
772 symtab_hdr->sh_info, 0,
778 amt = symtab_hdr->sh_info;
779 amt *= sizeof (asection *);
780 sections = bfd_malloc (amt);
781 if (sections == NULL && amt != 0)
784 isymend = isymbuf + symtab_hdr->sh_info;
785 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
789 if (isym->st_shndx == SHN_UNDEF)
790 isec = bfd_und_section_ptr;
791 else if (isym->st_shndx == SHN_ABS)
792 isec = bfd_abs_section_ptr;
793 else if (isym->st_shndx == SHN_COMMON)
794 isec = bfd_com_section_ptr;
796 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
801 if (! elf32_crx_relocate_section (output_bfd, link_info, input_bfd,
802 input_section, data, internal_relocs,
806 if (sections != NULL)
809 && symtab_hdr->contents != (unsigned char *) isymbuf)
811 if (elf_section_data (input_section)->relocs != internal_relocs)
812 free (internal_relocs);
818 if (sections != NULL)
821 && symtab_hdr->contents != (unsigned char *) isymbuf)
823 if (internal_relocs != NULL
824 && elf_section_data (input_section)->relocs != internal_relocs)
825 free (internal_relocs);
829 /* Relocate a CRX ELF section. */
832 elf32_crx_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
833 bfd *input_bfd, asection *input_section,
834 bfd_byte *contents, Elf_Internal_Rela *relocs,
835 Elf_Internal_Sym *local_syms,
836 asection **local_sections)
838 Elf_Internal_Shdr *symtab_hdr;
839 struct elf_link_hash_entry **sym_hashes;
840 Elf_Internal_Rela *rel, *relend;
842 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
843 sym_hashes = elf_sym_hashes (input_bfd);
846 relend = relocs + input_section->reloc_count;
847 for (; rel < relend; rel++)
850 reloc_howto_type *howto;
851 unsigned long r_symndx;
852 Elf_Internal_Sym *sym;
854 struct elf_link_hash_entry *h;
856 bfd_reloc_status_type r;
858 r_symndx = ELF32_R_SYM (rel->r_info);
859 r_type = ELF32_R_TYPE (rel->r_info);
860 howto = crx_elf_howto_table + (r_type);
865 if (r_symndx < symtab_hdr->sh_info)
867 sym = local_syms + r_symndx;
868 sec = local_sections[r_symndx];
869 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
873 bfd_boolean unresolved_reloc, warned, ignored;
875 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
876 r_symndx, symtab_hdr, sym_hashes,
878 unresolved_reloc, warned, ignored);
881 if (sec != NULL && discarded_section (sec))
882 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
883 rel, 1, relend, howto, 0, contents);
885 if (info->relocatable)
888 r = crx_elf_final_link_relocate (howto, input_bfd, output_bfd,
890 contents, rel->r_offset,
891 relocation, rel->r_addend,
892 info, sec, h == NULL);
894 if (r != bfd_reloc_ok)
897 const char *msg = (const char *) 0;
900 name = h->root.root.string;
903 name = (bfd_elf_string_from_elf_section
904 (input_bfd, symtab_hdr->sh_link, sym->st_name));
905 if (name == NULL || *name == '\0')
906 name = bfd_section_name (input_bfd, sec);
911 case bfd_reloc_overflow:
912 if (!((*info->callbacks->reloc_overflow)
913 (info, (h ? &h->root : NULL), name, howto->name,
914 (bfd_vma) 0, input_bfd, input_section,
919 case bfd_reloc_undefined:
920 if (!((*info->callbacks->undefined_symbol)
921 (info, name, input_bfd, input_section,
922 rel->r_offset, TRUE)))
926 case bfd_reloc_outofrange:
927 msg = _("internal error: out of range error");
930 case bfd_reloc_notsupported:
931 msg = _("internal error: unsupported relocation error");
934 case bfd_reloc_dangerous:
935 msg = _("internal error: dangerous error");
939 msg = _("internal error: unknown error");
943 if (!((*info->callbacks->warning)
944 (info, msg, name, input_bfd, input_section,
955 /* This function handles relaxing for the CRX.
957 There's quite a few relaxing opportunites available on the CRX:
959 * bal/bcond:32 -> bal/bcond:16 2 bytes
960 * bcond:16 -> bcond:8 2 bytes
961 * cmpbcond:24 -> cmpbcond:8 2 bytes
962 * arithmetic imm32 -> arithmetic imm16 2 bytes
964 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
967 elf32_crx_relax_section (bfd *abfd, asection *sec,
968 struct bfd_link_info *link_info, bfd_boolean *again)
970 Elf_Internal_Shdr *symtab_hdr;
971 Elf_Internal_Rela *internal_relocs;
972 Elf_Internal_Rela *irel, *irelend;
973 bfd_byte *contents = NULL;
974 Elf_Internal_Sym *isymbuf = NULL;
976 /* Assume nothing changes. */
979 /* We don't have to do anything for a relocatable link, if
980 this section does not have relocs, or if this is not a
982 if (link_info->relocatable
983 || (sec->flags & SEC_RELOC) == 0
984 || sec->reloc_count == 0
985 || (sec->flags & SEC_CODE) == 0)
988 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
990 /* Get a copy of the native relocations. */
991 internal_relocs = (_bfd_elf_link_read_relocs
992 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
993 link_info->keep_memory));
994 if (internal_relocs == NULL)
997 /* Walk through them looking for relaxing opportunities. */
998 irelend = internal_relocs + sec->reloc_count;
999 for (irel = internal_relocs; irel < irelend; irel++)
1003 /* If this isn't something that can be relaxed, then ignore
1005 if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL32
1006 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL16
1007 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL24
1008 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_IMM32)
1011 /* Get the section contents if we haven't done so already. */
1012 if (contents == NULL)
1014 /* Get cached copy if it exists. */
1015 if (elf_section_data (sec)->this_hdr.contents != NULL)
1016 contents = elf_section_data (sec)->this_hdr.contents;
1017 /* Go get them off disk. */
1018 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1022 /* Read this BFD's local symbols if we haven't done so already. */
1023 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
1025 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1026 if (isymbuf == NULL)
1027 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
1028 symtab_hdr->sh_info, 0,
1030 if (isymbuf == NULL)
1034 /* Get the value of the symbol referred to by the reloc. */
1035 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
1037 /* A local symbol. */
1038 Elf_Internal_Sym *isym;
1041 isym = isymbuf + ELF32_R_SYM (irel->r_info);
1042 if (isym->st_shndx == SHN_UNDEF)
1043 sym_sec = bfd_und_section_ptr;
1044 else if (isym->st_shndx == SHN_ABS)
1045 sym_sec = bfd_abs_section_ptr;
1046 else if (isym->st_shndx == SHN_COMMON)
1047 sym_sec = bfd_com_section_ptr;
1049 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1050 symval = (isym->st_value
1051 + sym_sec->output_section->vma
1052 + sym_sec->output_offset);
1057 struct elf_link_hash_entry *h;
1059 /* An external symbol. */
1060 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
1061 h = elf_sym_hashes (abfd)[indx];
1062 BFD_ASSERT (h != NULL);
1064 if (h->root.type != bfd_link_hash_defined
1065 && h->root.type != bfd_link_hash_defweak)
1066 /* This appears to be a reference to an undefined
1067 symbol. Just ignore it--it will be caught by the
1068 regular reloc processing. */
1071 symval = (h->root.u.def.value
1072 + h->root.u.def.section->output_section->vma
1073 + h->root.u.def.section->output_offset);
1076 /* For simplicity of coding, we are going to modify the section
1077 contents, the section relocs, and the BFD symbol table. We
1078 must tell the rest of the code not to free up this
1079 information. It would be possible to instead create a table
1080 of changes which have to be made, as is done in coff-mips.c;
1081 that would be more work, but would require less memory when
1082 the linker is run. */
1084 /* Try to turn a 32bit pc-relative branch/call into
1085 a 16bit pc-relative branch/call. */
1086 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL32)
1088 bfd_vma value = symval;
1090 /* Deal with pc-relative gunk. */
1091 value -= (sec->output_section->vma + sec->output_offset);
1092 value -= irel->r_offset;
1093 value += irel->r_addend;
1095 /* See if the value will fit in 16 bits, note the high value is
1096 0xfffe + 2 as the target will be two bytes closer if we are
1098 if ((long) value < 0x10000 && (long) value > -0x10002)
1100 unsigned short code;
1102 /* Get the opcode. */
1103 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1105 /* Verify it's a 'bal'/'bcond' and fix the opcode. */
1106 if ((code & 0xfff0) == 0x3170)
1107 bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1);
1108 else if ((code & 0xf0ff) == 0x707f)
1109 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset);
1113 /* Note that we've changed the relocs, section contents, etc. */
1114 elf_section_data (sec)->relocs = internal_relocs;
1115 elf_section_data (sec)->this_hdr.contents = contents;
1116 symtab_hdr->contents = (unsigned char *) isymbuf;
1118 /* Fix the relocation's type. */
1119 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1122 /* Delete two bytes of data. */
1123 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1124 irel->r_offset + 2, 2))
1127 /* That will change things, so, we should relax again.
1128 Note that this is not required, and it may be slow. */
1133 /* Try to turn a 16bit pc-relative branch into an
1134 8bit pc-relative branch. */
1135 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL16)
1137 bfd_vma value = symval;
1139 /* Deal with pc-relative gunk. */
1140 value -= (sec->output_section->vma + sec->output_offset);
1141 value -= irel->r_offset;
1142 value += irel->r_addend;
1144 /* See if the value will fit in 8 bits, note the high value is
1145 0xfc + 2 as the target will be two bytes closer if we are
1147 if ((long) value < 0xfe && (long) value > -0x100)
1149 unsigned short code;
1151 /* Get the opcode. */
1152 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1154 /* Verify it's a 'bcond' opcode. */
1155 if ((code & 0xf0ff) != 0x707e)
1158 /* Note that we've changed the relocs, section contents, etc. */
1159 elf_section_data (sec)->relocs = internal_relocs;
1160 elf_section_data (sec)->this_hdr.contents = contents;
1161 symtab_hdr->contents = (unsigned char *) isymbuf;
1163 /* Fix the relocation's type. */
1164 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1167 /* Delete two bytes of data. */
1168 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1169 irel->r_offset + 2, 2))
1172 /* That will change things, so, we should relax again.
1173 Note that this is not required, and it may be slow. */
1178 /* Try to turn a 24bit pc-relative cmp&branch into
1179 an 8bit pc-relative cmp&branch. */
1180 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL24)
1182 bfd_vma value = symval;
1184 /* Deal with pc-relative gunk. */
1185 value -= (sec->output_section->vma + sec->output_offset);
1186 value -= irel->r_offset;
1187 value += irel->r_addend;
1189 /* See if the value will fit in 8 bits, note the high value is
1190 0x7e + 2 as the target will be two bytes closer if we are
1192 if ((long) value < 0x100 && (long) value > -0x100)
1194 unsigned short code;
1196 /* Get the opcode. */
1197 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1199 /* Verify it's a 'cmp&branch' opcode. */
1200 if ((code & 0xfff0) != 0x3180 && (code & 0xfff0) != 0x3190
1201 && (code & 0xfff0) != 0x31a0 && (code & 0xfff0) != 0x31c0
1202 && (code & 0xfff0) != 0x31d0 && (code & 0xfff0) != 0x31e0
1203 /* Or a Co-processor branch ('bcop'). */
1204 && (code & 0xfff0) != 0x3010 && (code & 0xfff0) != 0x3110)
1207 /* Note that we've changed the relocs, section contents, etc. */
1208 elf_section_data (sec)->relocs = internal_relocs;
1209 elf_section_data (sec)->this_hdr.contents = contents;
1210 symtab_hdr->contents = (unsigned char *) isymbuf;
1212 /* Fix the opcode. */
1213 bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1);
1215 /* Fix the relocation's type. */
1216 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1219 /* Delete two bytes of data. */
1220 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1221 irel->r_offset + 4, 2))
1224 /* That will change things, so, we should relax again.
1225 Note that this is not required, and it may be slow. */
1230 /* Try to turn a 32bit immediate address into
1231 a 16bit immediate address. */
1232 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_IMM32)
1234 bfd_vma value = symval;
1236 /* See if the value will fit in 16 bits. */
1237 if ((long) value < 0x7fff && (long) value > -0x8000)
1239 unsigned short code;
1241 /* Get the opcode. */
1242 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1244 /* Verify it's a 'arithmetic double'. */
1245 if ((code & 0xf0f0) != 0x20f0)
1248 /* Note that we've changed the relocs, section contents, etc. */
1249 elf_section_data (sec)->relocs = internal_relocs;
1250 elf_section_data (sec)->this_hdr.contents = contents;
1251 symtab_hdr->contents = (unsigned char *) isymbuf;
1253 /* Fix the opcode. */
1254 bfd_put_8 (abfd, (code & 0xff) - 0x10, contents + irel->r_offset);
1256 /* Fix the relocation's type. */
1257 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1260 /* Delete two bytes of data. */
1261 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1262 irel->r_offset + 2, 2))
1265 /* That will change things, so, we should relax again.
1266 Note that this is not required, and it may be slow. */
1273 && symtab_hdr->contents != (unsigned char *) isymbuf)
1275 if (! link_info->keep_memory)
1279 /* Cache the symbols for elf_link_input_bfd. */
1280 symtab_hdr->contents = (unsigned char *) isymbuf;
1284 if (contents != NULL
1285 && elf_section_data (sec)->this_hdr.contents != contents)
1287 if (! link_info->keep_memory)
1291 /* Cache the section contents for elf_link_input_bfd. */
1292 elf_section_data (sec)->this_hdr.contents = contents;
1296 if (internal_relocs != NULL
1297 && elf_section_data (sec)->relocs != internal_relocs)
1298 free (internal_relocs);
1304 && symtab_hdr->contents != (unsigned char *) isymbuf)
1306 if (contents != NULL
1307 && elf_section_data (sec)->this_hdr.contents != contents)
1309 if (internal_relocs != NULL
1310 && elf_section_data (sec)->relocs != internal_relocs)
1311 free (internal_relocs);
1316 /* Definitions for setting CRX target vector. */
1317 #define TARGET_LITTLE_SYM crx_elf32_vec
1318 #define TARGET_LITTLE_NAME "elf32-crx"
1319 #define ELF_ARCH bfd_arch_crx
1320 #define ELF_MACHINE_CODE EM_CRX
1321 #define ELF_MAXPAGESIZE 0x1
1322 #define elf_symbol_leading_char '_'
1324 #define bfd_elf32_bfd_reloc_type_lookup elf_crx_reloc_type_lookup
1325 #define bfd_elf32_bfd_reloc_name_lookup \
1326 elf_crx_reloc_name_lookup
1327 #define elf_info_to_howto elf_crx_info_to_howto
1328 #define elf_info_to_howto_rel 0
1329 #define elf_backend_relocate_section elf32_crx_relocate_section
1330 #define bfd_elf32_bfd_relax_section elf32_crx_relax_section
1331 #define bfd_elf32_bfd_get_relocated_section_contents \
1332 elf32_crx_get_relocated_section_contents
1333 #define elf_backend_can_gc_sections 1
1334 #define elf_backend_rela_normal 1
1336 #include "elf32-target.h"