1 /* BFD back-end for National Semiconductor's CRX ELF
2 Copyright 2004 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 static reloc_howto_type *elf_crx_reloc_type_lookup
29 (bfd *, bfd_reloc_code_real_type);
30 static void elf_crx_info_to_howto
31 (bfd *, arelent *, Elf_Internal_Rela *);
32 static bfd_boolean elf32_crx_relax_delete_bytes
33 (struct bfd_link_info *, bfd *, asection *, bfd_vma, int);
34 static bfd_reloc_status_type crx_elf_final_link_relocate
35 (reloc_howto_type *, bfd *, bfd *, asection *,
36 bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
37 struct bfd_link_info *, asection *, int);
38 static bfd_boolean elf32_crx_relocate_section
39 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
40 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
41 static asection * elf32_crx_gc_mark_hook
42 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
43 struct elf_link_hash_entry *, Elf_Internal_Sym *);
44 static bfd_boolean elf32_crx_gc_sweep_hook
45 (bfd *, struct bfd_link_info *, asection *,
46 const Elf_Internal_Rela *);
47 static bfd_boolean elf32_crx_relax_section
48 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
49 static bfd_byte * elf32_crx_get_relocated_section_contents
50 (bfd *, struct bfd_link_info *, struct bfd_link_order *,
51 bfd_byte *, bfd_boolean, asymbol **);
53 /* crx_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */
57 bfd_reloc_code_real_type bfd_reloc_enum; /* BFD relocation enum. */
58 unsigned short crx_reloc_type; /* CRX relocation type. */
61 static const struct crx_reloc_map crx_reloc_map[R_CRX_MAX] =
63 {BFD_RELOC_NONE, R_CRX_NONE},
64 {BFD_RELOC_CRX_REL4, R_CRX_REL4},
65 {BFD_RELOC_CRX_REL8, R_CRX_REL8},
66 {BFD_RELOC_CRX_REL8_CMP, R_CRX_REL8_CMP},
67 {BFD_RELOC_CRX_REL16, R_CRX_REL16},
68 {BFD_RELOC_CRX_REL24, R_CRX_REL24},
69 {BFD_RELOC_CRX_REL32, R_CRX_REL32},
70 {BFD_RELOC_CRX_REGREL12, R_CRX_REGREL12},
71 {BFD_RELOC_CRX_REGREL22, R_CRX_REGREL22},
72 {BFD_RELOC_CRX_REGREL28, R_CRX_REGREL28},
73 {BFD_RELOC_CRX_REGREL32, R_CRX_REGREL32},
74 {BFD_RELOC_CRX_ABS16, R_CRX_ABS16},
75 {BFD_RELOC_CRX_ABS32, R_CRX_ABS32},
76 {BFD_RELOC_CRX_NUM8, R_CRX_NUM8},
77 {BFD_RELOC_CRX_NUM16, R_CRX_NUM16},
78 {BFD_RELOC_CRX_NUM32, R_CRX_NUM32},
79 {BFD_RELOC_CRX_IMM16, R_CRX_IMM16},
80 {BFD_RELOC_CRX_IMM32, R_CRX_IMM32},
81 {BFD_RELOC_CRX_SWITCH8, R_CRX_SWITCH8},
82 {BFD_RELOC_CRX_SWITCH16, R_CRX_SWITCH16},
83 {BFD_RELOC_CRX_SWITCH32, R_CRX_SWITCH32}
86 static reloc_howto_type crx_elf_howto_table[] =
88 HOWTO (R_CRX_NONE, /* type */
92 FALSE, /* pc_relative */
94 complain_overflow_dont,/* complain_on_overflow */
95 bfd_elf_generic_reloc, /* special_function */
96 "R_CRX_NONE", /* name */
97 FALSE, /* partial_inplace */
100 FALSE), /* pcrel_offset */
102 HOWTO (R_CRX_REL4, /* type */
106 TRUE, /* pc_relative */
108 complain_overflow_bitfield,/* complain_on_overflow */
109 bfd_elf_generic_reloc, /* special_function */
110 "R_CRX_REL4", /* name */
111 FALSE, /* partial_inplace */
114 FALSE), /* pcrel_offset */
116 HOWTO (R_CRX_REL8, /* type */
120 TRUE, /* pc_relative */
122 complain_overflow_bitfield,/* complain_on_overflow */
123 bfd_elf_generic_reloc, /* special_function */
124 "R_CRX_REL8", /* name */
125 FALSE, /* partial_inplace */
128 FALSE), /* pcrel_offset */
130 HOWTO (R_CRX_REL8_CMP, /* type */
134 TRUE, /* pc_relative */
136 complain_overflow_bitfield,/* complain_on_overflow */
137 bfd_elf_generic_reloc, /* special_function */
138 "R_CRX_REL8_CMP", /* name */
139 FALSE, /* partial_inplace */
142 FALSE), /* pcrel_offset */
144 HOWTO (R_CRX_REL16, /* type */
148 TRUE, /* pc_relative */
150 complain_overflow_bitfield,/* complain_on_overflow */
151 bfd_elf_generic_reloc, /* special_function */
152 "R_CRX_REL16", /* name */
153 FALSE, /* partial_inplace */
154 0xffff, /* src_mask */
155 0xffff, /* dst_mask */
156 FALSE), /* pcrel_offset */
158 HOWTO (R_CRX_REL24, /* type */
162 TRUE, /* pc_relative */
164 complain_overflow_bitfield,/* complain_on_overflow */
165 bfd_elf_generic_reloc, /* special_function */
166 "R_CRX_REL24", /* name */
167 FALSE, /* partial_inplace */
168 0xffffff, /* src_mask */
169 0xffffff, /* dst_mask */
170 FALSE), /* pcrel_offset */
172 HOWTO (R_CRX_REL32, /* type */
176 TRUE, /* pc_relative */
178 complain_overflow_bitfield,/* complain_on_overflow */
179 bfd_elf_generic_reloc, /* special_function */
180 "R_CRX_REL32", /* name */
181 FALSE, /* partial_inplace */
182 0xffffffff, /* src_mask */
183 0xffffffff, /* dst_mask */
184 FALSE), /* pcrel_offset */
186 HOWTO (R_CRX_REGREL12, /* type */
190 FALSE, /* pc_relative */
192 complain_overflow_bitfield,/* complain_on_overflow */
193 bfd_elf_generic_reloc, /* special_function */
194 "R_CRX_REGREL12", /* name */
195 FALSE, /* partial_inplace */
196 0xfff, /* src_mask */
197 0xfff, /* dst_mask */
198 FALSE), /* pcrel_offset */
200 HOWTO (R_CRX_REGREL22, /* type */
204 FALSE, /* pc_relative */
206 complain_overflow_bitfield,/* complain_on_overflow */
207 bfd_elf_generic_reloc, /* special_function */
208 "R_CRX_REGREL22", /* name */
209 FALSE, /* partial_inplace */
210 0x3fffff, /* src_mask */
211 0x3fffff, /* dst_mask */
212 FALSE), /* pcrel_offset */
214 HOWTO (R_CRX_REGREL28, /* type */
218 FALSE, /* pc_relative */
220 complain_overflow_bitfield,/* complain_on_overflow */
221 bfd_elf_generic_reloc, /* special_function */
222 "R_CRX_REGREL28", /* name */
223 FALSE, /* partial_inplace */
224 0xfffffff, /* src_mask */
225 0xfffffff, /* dst_mask */
226 FALSE), /* pcrel_offset */
228 HOWTO (R_CRX_REGREL32, /* type */
232 FALSE, /* pc_relative */
234 complain_overflow_bitfield,/* complain_on_overflow */
235 bfd_elf_generic_reloc, /* special_function */
236 "R_CRX_REGREL32", /* name */
237 FALSE, /* partial_inplace */
238 0xffffffff, /* src_mask */
239 0xffffffff, /* dst_mask */
240 FALSE), /* pcrel_offset */
242 HOWTO (R_CRX_ABS16, /* type */
246 FALSE, /* pc_relative */
248 complain_overflow_bitfield,/* complain_on_overflow */
249 bfd_elf_generic_reloc, /* special_function */
250 "R_CRX_ABS16", /* name */
251 FALSE, /* partial_inplace */
252 0xffff, /* src_mask */
253 0xffff, /* dst_mask */
254 FALSE), /* pcrel_offset */
256 HOWTO (R_CRX_ABS32, /* type */
260 FALSE, /* pc_relative */
262 complain_overflow_bitfield,/* complain_on_overflow */
263 bfd_elf_generic_reloc, /* special_function */
264 "R_CRX_ABS32", /* name */
265 FALSE, /* partial_inplace */
266 0xffffffff, /* src_mask */
267 0xffffffff, /* dst_mask */
268 FALSE), /* pcrel_offset */
270 HOWTO (R_CRX_NUM8, /* type */
274 FALSE, /* pc_relative */
276 complain_overflow_bitfield,/* complain_on_overflow */
277 bfd_elf_generic_reloc, /* special_function */
278 "R_CRX_NUM8", /* name */
279 FALSE, /* partial_inplace */
282 FALSE), /* pcrel_offset */
284 HOWTO (R_CRX_NUM16, /* type */
288 FALSE, /* pc_relative */
290 complain_overflow_bitfield,/* complain_on_overflow */
291 bfd_elf_generic_reloc, /* special_function */
292 "R_CRX_NUM16", /* name */
293 FALSE, /* partial_inplace */
294 0xffff, /* src_mask */
295 0xffff, /* dst_mask */
296 FALSE), /* pcrel_offset */
298 HOWTO (R_CRX_NUM32, /* type */
302 FALSE, /* pc_relative */
304 complain_overflow_bitfield,/* complain_on_overflow */
305 bfd_elf_generic_reloc, /* special_function */
306 "R_CRX_NUM32", /* name */
307 FALSE, /* partial_inplace */
308 0xffffffff, /* src_mask */
309 0xffffffff, /* dst_mask */
310 FALSE), /* pcrel_offset */
312 HOWTO (R_CRX_IMM16, /* type */
316 FALSE, /* pc_relative */
318 complain_overflow_bitfield,/* complain_on_overflow */
319 bfd_elf_generic_reloc, /* special_function */
320 "R_CRX_IMM16", /* name */
321 FALSE, /* partial_inplace */
322 0xffff, /* src_mask */
323 0xffff, /* dst_mask */
324 FALSE), /* pcrel_offset */
326 HOWTO (R_CRX_IMM32, /* type */
330 FALSE, /* pc_relative */
332 complain_overflow_bitfield,/* complain_on_overflow */
333 bfd_elf_generic_reloc, /* special_function */
334 "R_CRX_IMM32", /* name */
335 FALSE, /* partial_inplace */
336 0xffffffff, /* src_mask */
337 0xffffffff, /* dst_mask */
338 FALSE), /* pcrel_offset */
340 /* An 8 bit switch table entry. This is generated for an expression
341 such as ``.byte L1 - L2''. The offset holds the difference
342 between the reloc address and L2. */
343 HOWTO (R_CRX_SWITCH8, /* type */
345 0, /* size (0 = byte, 1 = short, 2 = long) */
347 FALSE, /* pc_relative */
349 complain_overflow_unsigned, /* complain_on_overflow */
350 bfd_elf_generic_reloc, /* special_function */
351 "R_CRX_SWITCH8", /* name */
352 FALSE, /* partial_inplace */
355 TRUE), /* pcrel_offset */
357 /* A 16 bit switch table entry. This is generated for an expression
358 such as ``.word L1 - L2''. The offset holds the difference
359 between the reloc address and L2. */
360 HOWTO (R_CRX_SWITCH16, /* type */
362 1, /* size (0 = byte, 1 = short, 2 = long) */
364 FALSE, /* pc_relative */
366 complain_overflow_unsigned, /* complain_on_overflow */
367 bfd_elf_generic_reloc, /* special_function */
368 "R_CRX_SWITCH16", /* name */
369 FALSE, /* partial_inplace */
370 0xffff, /* src_mask */
371 0xffff, /* dst_mask */
372 TRUE), /* pcrel_offset */
374 /* A 32 bit switch table entry. This is generated for an expression
375 such as ``.long L1 - L2''. The offset holds the difference
376 between the reloc address and L2. */
377 HOWTO (R_CRX_SWITCH32, /* type */
379 2, /* size (0 = byte, 1 = short, 2 = long) */
381 FALSE, /* pc_relative */
383 complain_overflow_unsigned, /* complain_on_overflow */
384 bfd_elf_generic_reloc, /* special_function */
385 "R_CRX_SWITCH32", /* name */
386 FALSE, /* partial_inplace */
387 0xffffffff, /* src_mask */
388 0xffffffff, /* dst_mask */
389 TRUE) /* pcrel_offset */
392 /* Retrieve a howto ptr using a BFD reloc_code. */
394 static reloc_howto_type *
395 elf_crx_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
396 bfd_reloc_code_real_type code)
400 for (i = 0; i < R_CRX_MAX; i++)
401 if (code == crx_reloc_map[i].bfd_reloc_enum)
402 return &crx_elf_howto_table[crx_reloc_map[i].crx_reloc_type];
404 printf ("This relocation Type is not supported -0x%x\n", code);
408 /* Retrieve a howto ptr using an internal relocation entry. */
411 elf_crx_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
412 Elf_Internal_Rela *dst)
414 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
415 BFD_ASSERT (r_type < (unsigned int) R_CRX_MAX);
416 cache_ptr->howto = &crx_elf_howto_table[r_type];
419 /* Perform a relocation as part of a final link. */
421 static bfd_reloc_status_type
422 crx_elf_final_link_relocate (reloc_howto_type *howto, bfd *input_bfd,
423 bfd *output_bfd ATTRIBUTE_UNUSED,
424 asection *input_section, bfd_byte *contents,
425 bfd_vma offset, bfd_vma Rvalue, bfd_vma addend,
426 struct bfd_link_info *info ATTRIBUTE_UNUSED,
427 asection *sec ATTRIBUTE_UNUSED,
428 int is_local ATTRIBUTE_UNUSED)
430 unsigned short r_type = howto->type;
431 bfd_byte *hit_data = contents + offset;
432 bfd_vma reloc_bits, check;
448 /* 'hit_data' is relative to the start of the instruction, not the
449 relocation offset. Advance it to account for the exact offset. */
454 /* This relocation type is used only in 'Branch if Equal to 0'
455 instructions and requires special handling. */
466 /* We only care about the addend, where the difference between
467 expressions is kept. */
474 if (howto->pc_relative)
476 /* Subtract the address of the section containing the location. */
477 Rvalue -= (input_section->output_section->vma
478 + input_section->output_offset);
479 /* Subtract the position of the location within the section. */
483 /* Add in supplied addend. */
486 /* Complain if the bitfield overflows, whether it is considered
487 as signed or unsigned. */
488 check = Rvalue >> howto->rightshift;
490 /* Assumes two's complement. This expression avoids
491 overflow if howto->bitsize is the number of bits in
493 reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
495 if (((bfd_vma) check & ~reloc_bits) != 0
496 && (((bfd_vma) check & ~reloc_bits)
497 != (-(bfd_vma) 1 & ~reloc_bits)))
499 /* The above right shift is incorrect for a signed
500 value. See if turning on the upper bits fixes the
502 if (howto->rightshift && (bfd_signed_vma) Rvalue < 0)
504 check |= ((bfd_vma) - 1
506 >> howto->rightshift));
507 if (((bfd_vma) check & ~reloc_bits)
508 != (-(bfd_vma) 1 & ~reloc_bits))
509 return bfd_reloc_overflow;
512 return bfd_reloc_overflow;
515 /* Drop unwanted bits from the value we are relocating to. */
516 Rvalue >>= (bfd_vma) howto->rightshift;
518 /* Apply dst_mask to select only relocatable part of the insn. */
519 Rvalue &= howto->dst_mask;
524 if (r_type == R_CRX_REL4)
527 Rvalue |= (bfd_get_8 (input_bfd, hit_data) & 0x0f);
530 bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data);
534 if (r_type == R_CRX_REGREL12)
535 Rvalue |= (bfd_get_16 (input_bfd, hit_data) & 0xf000);
537 bfd_put_16 (input_bfd, Rvalue, hit_data);
541 if (r_type == R_CRX_REL24
542 || r_type == R_CRX_REGREL22
543 || r_type == R_CRX_REGREL28)
544 Rvalue |= (((bfd_get_16 (input_bfd, hit_data) << 16) |
545 bfd_get_16 (input_bfd, hit_data + 2)) & ~howto->dst_mask);
547 if (r_type == R_CRX_NUM32 || r_type == R_CRX_SWITCH32)
548 /* Relocation on DATA is purely little-endian, that is, for a
549 multi-byte datum, the lowest address in memory contains the
550 little end of the datum, that is, the least significant byte.
551 Therefore we use BFD's byte Putting functions. */
552 bfd_put_32 (input_bfd, Rvalue, hit_data);
554 /* Relocation on INSTRUCTIONS is different : Instructions are
555 word-addressable, that is, each word itself is arranged according
556 to little-endian convention, whereas the words are arranged with
557 respect to one another in BIG ENDIAN fashion.
558 When there is an immediate value that spans a word boundary, it is
559 split in a big-endian way with respect to the words. */
561 bfd_put_16 (input_bfd, (Rvalue >> 16) & 0xffff, hit_data);
562 bfd_put_16 (input_bfd, Rvalue & 0xffff, hit_data + 2);
567 return bfd_reloc_notsupported;
573 /* Delete some bytes from a section while relaxing. */
576 elf32_crx_relax_delete_bytes (struct bfd_link_info *link_info, bfd *abfd,
577 asection *sec, bfd_vma addr, int count)
579 Elf_Internal_Shdr *symtab_hdr;
580 unsigned int sec_shndx;
582 Elf_Internal_Rela *irel, *irelend;
583 Elf_Internal_Rela *irelalign;
585 Elf_Internal_Sym *isym;
586 Elf_Internal_Sym *isymend;
587 struct elf_link_hash_entry **sym_hashes;
588 struct elf_link_hash_entry **end_hashes;
589 struct elf_link_hash_entry **start_hashes;
590 unsigned int symcount;
592 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
594 contents = elf_section_data (sec)->this_hdr.contents;
596 /* The deletion must stop at the next ALIGN reloc for an aligment
597 power larger than the number of bytes we are deleting. */
602 irel = elf_section_data (sec)->relocs;
603 irelend = irel + sec->reloc_count;
605 /* Actually delete the bytes. */
606 memmove (contents + addr, contents + addr + count,
607 (size_t) (toaddr - addr - count));
610 /* Adjust all the relocs. */
611 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
613 /* Get the new reloc address. */
614 if ((irel->r_offset > addr
615 && irel->r_offset < toaddr))
616 irel->r_offset -= count;
619 /* Adjust the local symbols defined in this section. */
620 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
621 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
622 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
624 if (isym->st_shndx == sec_shndx
625 && isym->st_value > addr
626 && isym->st_value < toaddr)
628 /* Adjust the addend of SWITCH relocations in this section,
629 which reference this local symbol. */
630 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
632 unsigned long r_symndx;
633 Elf_Internal_Sym *rsym;
634 bfd_vma addsym, subsym;
636 /* Skip if not a SWITCH relocation. */
637 if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH8
638 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH16
639 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH32)
642 r_symndx = ELF32_R_SYM (irel->r_info);
643 rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx;
645 /* Skip if not the local adjusted symbol. */
649 addsym = isym->st_value;
650 subsym = addsym - irel->r_addend;
652 /* Fix the addend only when -->> (addsym > addr >= subsym). */
654 irel->r_addend -= count;
659 isym->st_value -= count;
663 /* Now adjust the global symbols defined in this section. */
664 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
665 - symtab_hdr->sh_info);
666 sym_hashes = start_hashes = elf_sym_hashes (abfd);
667 end_hashes = sym_hashes + symcount;
669 for (; sym_hashes < end_hashes; sym_hashes++)
671 struct elf_link_hash_entry *sym_hash = *sym_hashes;
673 /* The '--wrap SYMBOL' option is causing a pain when the object file,
674 containing the definition of __wrap_SYMBOL, includes a direct
675 call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
676 the same symbol (which is __wrap_SYMBOL), but still exist as two
677 different symbols in 'sym_hashes', we don't want to adjust
678 the global symbol __wrap_SYMBOL twice.
679 This check is only relevant when symbols are being wrapped. */
680 if (link_info->wrap_hash != NULL)
682 struct elf_link_hash_entry **cur_sym_hashes;
684 /* Loop only over the symbols whom been already checked. */
685 for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
688 /* If the current symbol is identical to 'sym_hash', that means
689 the symbol was already adjusted (or at least checked). */
690 if (*cur_sym_hashes == sym_hash)
693 /* Don't adjust the symbol again. */
694 if (cur_sym_hashes < sym_hashes)
698 if ((sym_hash->root.type == bfd_link_hash_defined
699 || sym_hash->root.type == bfd_link_hash_defweak)
700 && sym_hash->root.u.def.section == sec
701 && sym_hash->root.u.def.value > addr
702 && sym_hash->root.u.def.value < toaddr)
703 sym_hash->root.u.def.value -= count;
709 /* This is a version of bfd_generic_get_relocated_section_contents
710 which uses elf32_crx_relocate_section. */
713 elf32_crx_get_relocated_section_contents (bfd *output_bfd,
714 struct bfd_link_info *link_info,
715 struct bfd_link_order *link_order,
717 bfd_boolean relocatable,
720 Elf_Internal_Shdr *symtab_hdr;
721 asection *input_section = link_order->u.indirect.section;
722 bfd *input_bfd = input_section->owner;
723 asection **sections = NULL;
724 Elf_Internal_Rela *internal_relocs = NULL;
725 Elf_Internal_Sym *isymbuf = NULL;
727 /* We only need to handle the case of relaxing, or of having a
728 particular set of section contents, specially. */
730 || elf_section_data (input_section)->this_hdr.contents == NULL)
731 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
736 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
738 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
739 (size_t) input_section->size);
741 if ((input_section->flags & SEC_RELOC) != 0
742 && input_section->reloc_count > 0)
744 Elf_Internal_Sym *isym;
745 Elf_Internal_Sym *isymend;
749 internal_relocs = (_bfd_elf_link_read_relocs
750 (input_bfd, input_section, (PTR) NULL,
751 (Elf_Internal_Rela *) NULL, FALSE));
752 if (internal_relocs == NULL)
755 if (symtab_hdr->sh_info != 0)
757 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
759 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
760 symtab_hdr->sh_info, 0,
766 amt = symtab_hdr->sh_info;
767 amt *= sizeof (asection *);
768 sections = bfd_malloc (amt);
769 if (sections == NULL && amt != 0)
772 isymend = isymbuf + symtab_hdr->sh_info;
773 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
777 if (isym->st_shndx == SHN_UNDEF)
778 isec = bfd_und_section_ptr;
779 else if (isym->st_shndx == SHN_ABS)
780 isec = bfd_abs_section_ptr;
781 else if (isym->st_shndx == SHN_COMMON)
782 isec = bfd_com_section_ptr;
784 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
789 if (! elf32_crx_relocate_section (output_bfd, link_info, input_bfd,
790 input_section, data, internal_relocs,
794 if (sections != NULL)
797 && symtab_hdr->contents != (unsigned char *) isymbuf)
799 if (elf_section_data (input_section)->relocs != internal_relocs)
800 free (internal_relocs);
806 if (sections != NULL)
809 && symtab_hdr->contents != (unsigned char *) isymbuf)
811 if (internal_relocs != NULL
812 && elf_section_data (input_section)->relocs != internal_relocs)
813 free (internal_relocs);
817 /* Relocate a CRX ELF section. */
820 elf32_crx_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
821 bfd *input_bfd, asection *input_section,
822 bfd_byte *contents, Elf_Internal_Rela *relocs,
823 Elf_Internal_Sym *local_syms,
824 asection **local_sections)
826 Elf_Internal_Shdr *symtab_hdr;
827 struct elf_link_hash_entry **sym_hashes;
828 Elf_Internal_Rela *rel, *relend;
830 if (info->relocatable)
833 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
834 sym_hashes = elf_sym_hashes (input_bfd);
837 relend = relocs + input_section->reloc_count;
838 for (; rel < relend; rel++)
841 reloc_howto_type *howto;
842 unsigned long r_symndx;
843 Elf_Internal_Sym *sym;
845 struct elf_link_hash_entry *h;
847 bfd_reloc_status_type r;
849 r_symndx = ELF32_R_SYM (rel->r_info);
850 r_type = ELF32_R_TYPE (rel->r_info);
851 howto = crx_elf_howto_table + (r_type);
856 if (r_symndx < symtab_hdr->sh_info)
858 sym = local_syms + r_symndx;
859 sec = local_sections[r_symndx];
860 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
864 bfd_boolean unresolved_reloc, warned;
866 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
867 r_symndx, symtab_hdr, sym_hashes,
869 unresolved_reloc, warned);
872 r = crx_elf_final_link_relocate (howto, input_bfd, output_bfd,
874 contents, rel->r_offset,
875 relocation, rel->r_addend,
876 info, sec, h == NULL);
878 if (r != bfd_reloc_ok)
881 const char *msg = (const char *) 0;
884 name = h->root.root.string;
887 name = (bfd_elf_string_from_elf_section
888 (input_bfd, symtab_hdr->sh_link, sym->st_name));
889 if (name == NULL || *name == '\0')
890 name = bfd_section_name (input_bfd, sec);
895 case bfd_reloc_overflow:
896 if (!((*info->callbacks->reloc_overflow)
897 (info, (h ? &h->root : NULL), name, howto->name,
898 (bfd_vma) 0, input_bfd, input_section,
903 case bfd_reloc_undefined:
904 if (!((*info->callbacks->undefined_symbol)
905 (info, name, input_bfd, input_section,
906 rel->r_offset, TRUE)))
910 case bfd_reloc_outofrange:
911 msg = _("internal error: out of range error");
914 case bfd_reloc_notsupported:
915 msg = _("internal error: unsupported relocation error");
918 case bfd_reloc_dangerous:
919 msg = _("internal error: dangerous error");
923 msg = _("internal error: unknown error");
927 if (!((*info->callbacks->warning)
928 (info, msg, name, input_bfd, input_section,
939 /* This function handles relaxing for the CRX.
941 There's quite a few relaxing opportunites available on the CRX:
943 * bal/bcond:32 -> bal/bcond:16 2 bytes
944 * bcond:16 -> bcond:8 2 bytes
945 * cmpbcond:24 -> cmpbcond:8 2 bytes
946 * arithmetic imm32 -> arithmetic imm16 2 bytes
948 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
951 elf32_crx_relax_section (bfd *abfd, asection *sec,
952 struct bfd_link_info *link_info, bfd_boolean *again)
954 Elf_Internal_Shdr *symtab_hdr;
955 Elf_Internal_Rela *internal_relocs;
956 Elf_Internal_Rela *irel, *irelend;
957 bfd_byte *contents = NULL;
958 Elf_Internal_Sym *isymbuf = NULL;
960 /* Assume nothing changes. */
963 /* We don't have to do anything for a relocatable link, if
964 this section does not have relocs, or if this is not a
966 if (link_info->relocatable
967 || (sec->flags & SEC_RELOC) == 0
968 || sec->reloc_count == 0
969 || (sec->flags & SEC_CODE) == 0)
972 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
974 /* Get a copy of the native relocations. */
975 internal_relocs = (_bfd_elf_link_read_relocs
976 (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
977 link_info->keep_memory));
978 if (internal_relocs == NULL)
981 /* Walk through them looking for relaxing opportunities. */
982 irelend = internal_relocs + sec->reloc_count;
983 for (irel = internal_relocs; irel < irelend; irel++)
987 /* If this isn't something that can be relaxed, then ignore
989 if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL32
990 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL16
991 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL24
992 && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_IMM32)
995 /* Get the section contents if we haven't done so already. */
996 if (contents == NULL)
998 /* Get cached copy if it exists. */
999 if (elf_section_data (sec)->this_hdr.contents != NULL)
1000 contents = elf_section_data (sec)->this_hdr.contents;
1001 /* Go get them off disk. */
1002 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1006 /* Read this BFD's local symbols if we haven't done so already. */
1007 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
1009 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1010 if (isymbuf == NULL)
1011 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
1012 symtab_hdr->sh_info, 0,
1014 if (isymbuf == NULL)
1018 /* Get the value of the symbol referred to by the reloc. */
1019 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
1021 /* A local symbol. */
1022 Elf_Internal_Sym *isym;
1025 isym = isymbuf + ELF32_R_SYM (irel->r_info);
1026 if (isym->st_shndx == SHN_UNDEF)
1027 sym_sec = bfd_und_section_ptr;
1028 else if (isym->st_shndx == SHN_ABS)
1029 sym_sec = bfd_abs_section_ptr;
1030 else if (isym->st_shndx == SHN_COMMON)
1031 sym_sec = bfd_com_section_ptr;
1033 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1034 symval = (isym->st_value
1035 + sym_sec->output_section->vma
1036 + sym_sec->output_offset);
1041 struct elf_link_hash_entry *h;
1043 /* An external symbol. */
1044 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
1045 h = elf_sym_hashes (abfd)[indx];
1046 BFD_ASSERT (h != NULL);
1048 if (h->root.type != bfd_link_hash_defined
1049 && h->root.type != bfd_link_hash_defweak)
1050 /* This appears to be a reference to an undefined
1051 symbol. Just ignore it--it will be caught by the
1052 regular reloc processing. */
1055 symval = (h->root.u.def.value
1056 + h->root.u.def.section->output_section->vma
1057 + h->root.u.def.section->output_offset);
1060 /* For simplicity of coding, we are going to modify the section
1061 contents, the section relocs, and the BFD symbol table. We
1062 must tell the rest of the code not to free up this
1063 information. It would be possible to instead create a table
1064 of changes which have to be made, as is done in coff-mips.c;
1065 that would be more work, but would require less memory when
1066 the linker is run. */
1068 /* Try to turn a 32bit pc-relative branch/call into
1069 a 16bit pc-relative branch/call. */
1070 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL32)
1072 bfd_vma value = symval;
1074 /* Deal with pc-relative gunk. */
1075 value -= (sec->output_section->vma + sec->output_offset);
1076 value -= irel->r_offset;
1077 value += irel->r_addend;
1079 /* See if the value will fit in 16 bits, note the high value is
1080 0xfffe + 2 as the target will be two bytes closer if we are
1082 if ((long) value < 0x10000 && (long) value > -0x10002)
1084 unsigned short code;
1086 /* Get the opcode. */
1087 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1089 /* Verify it's a 'bal'/'bcond' and fix the opcode. */
1090 if ((code & 0xfff0) == 0x3170)
1091 bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1);
1092 else if ((code & 0xf0ff) == 0x707f)
1093 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset);
1097 /* Note that we've changed the relocs, section contents, etc. */
1098 elf_section_data (sec)->relocs = internal_relocs;
1099 elf_section_data (sec)->this_hdr.contents = contents;
1100 symtab_hdr->contents = (unsigned char *) isymbuf;
1102 /* Fix the relocation's type. */
1103 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1106 /* Delete two bytes of data. */
1107 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1108 irel->r_offset + 2, 2))
1111 /* That will change things, so, we should relax again.
1112 Note that this is not required, and it may be slow. */
1117 /* Try to turn a 16bit pc-relative branch into an
1118 8bit pc-relative branch. */
1119 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL16)
1121 bfd_vma value = symval;
1123 /* Deal with pc-relative gunk. */
1124 value -= (sec->output_section->vma + sec->output_offset);
1125 value -= irel->r_offset;
1126 value += irel->r_addend;
1128 /* See if the value will fit in 8 bits, note the high value is
1129 0xfc + 2 as the target will be two bytes closer if we are
1131 if ((long) value < 0xfe && (long) value > -0x100)
1133 unsigned short code;
1135 /* Get the opcode. */
1136 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1138 /* Verify it's a 'bcond' opcode. */
1139 if ((code & 0xf0ff) != 0x707e)
1142 /* Note that we've changed the relocs, section contents, etc. */
1143 elf_section_data (sec)->relocs = internal_relocs;
1144 elf_section_data (sec)->this_hdr.contents = contents;
1145 symtab_hdr->contents = (unsigned char *) isymbuf;
1147 /* Fix the relocation's type. */
1148 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1151 /* Delete two bytes of data. */
1152 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1153 irel->r_offset + 2, 2))
1156 /* That will change things, so, we should relax again.
1157 Note that this is not required, and it may be slow. */
1162 /* Try to turn a 24bit pc-relative cmp&branch into
1163 an 8bit pc-relative cmp&branch. */
1164 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL24)
1166 bfd_vma value = symval;
1168 /* Deal with pc-relative gunk. */
1169 value -= (sec->output_section->vma + sec->output_offset);
1170 value -= irel->r_offset;
1171 value += irel->r_addend;
1173 /* See if the value will fit in 8 bits, note the high value is
1174 0x7e + 2 as the target will be two bytes closer if we are
1176 if ((long) value < 0x100 && (long) value > -0x100)
1178 unsigned short code;
1180 /* Get the opcode. */
1181 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1183 /* Verify it's a 'cmp&branch' opcode. */
1184 if ((code & 0xfff0) != 0x3180 && (code & 0xfff0) != 0x3190
1185 && (code & 0xfff0) != 0x31a0 && (code & 0xfff0) != 0x31c0
1186 && (code & 0xfff0) != 0x31d0 && (code & 0xfff0) != 0x31e0)
1189 /* Note that we've changed the relocs, section contents, etc. */
1190 elf_section_data (sec)->relocs = internal_relocs;
1191 elf_section_data (sec)->this_hdr.contents = contents;
1192 symtab_hdr->contents = (unsigned char *) isymbuf;
1194 /* Fix the opcode. */
1195 bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1);
1197 /* Fix the relocation's type. */
1198 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1201 /* Delete two bytes of data. */
1202 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1203 irel->r_offset + 4, 2))
1206 /* That will change things, so, we should relax again.
1207 Note that this is not required, and it may be slow. */
1212 /* Try to turn a 32bit immediate address into
1213 a 16bit immediate address. */
1214 if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_IMM32)
1216 bfd_vma value = symval;
1218 /* See if the value will fit in 16 bits. */
1219 if ((long) value < 0x7fff && (long) value > -0x8000)
1221 unsigned short code;
1223 /* Get the opcode. */
1224 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
1226 /* Verify it's a 'arithmetic double'. */
1227 if ((code & 0xf0f0) != 0x20f0)
1230 /* Note that we've changed the relocs, section contents, etc. */
1231 elf_section_data (sec)->relocs = internal_relocs;
1232 elf_section_data (sec)->this_hdr.contents = contents;
1233 symtab_hdr->contents = (unsigned char *) isymbuf;
1235 /* Fix the opcode. */
1236 bfd_put_8 (abfd, (code & 0xff) - 0x10, contents + irel->r_offset);
1238 /* Fix the relocation's type. */
1239 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1242 /* Delete two bytes of data. */
1243 if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
1244 irel->r_offset + 2, 2))
1247 /* That will change things, so, we should relax again.
1248 Note that this is not required, and it may be slow. */
1255 && symtab_hdr->contents != (unsigned char *) isymbuf)
1257 if (! link_info->keep_memory)
1261 /* Cache the symbols for elf_link_input_bfd. */
1262 symtab_hdr->contents = (unsigned char *) isymbuf;
1266 if (contents != NULL
1267 && elf_section_data (sec)->this_hdr.contents != contents)
1269 if (! link_info->keep_memory)
1273 /* Cache the section contents for elf_link_input_bfd. */
1274 elf_section_data (sec)->this_hdr.contents = contents;
1278 if (internal_relocs != NULL
1279 && elf_section_data (sec)->relocs != internal_relocs)
1280 free (internal_relocs);
1286 && symtab_hdr->contents != (unsigned char *) isymbuf)
1288 if (contents != NULL
1289 && elf_section_data (sec)->this_hdr.contents != contents)
1291 if (internal_relocs != NULL
1292 && elf_section_data (sec)->relocs != internal_relocs)
1293 free (internal_relocs);
1299 elf32_crx_gc_mark_hook (asection *sec,
1300 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1301 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
1302 struct elf_link_hash_entry *h,
1303 Elf_Internal_Sym *sym)
1306 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1308 switch (h->root.type)
1310 case bfd_link_hash_defined:
1311 case bfd_link_hash_defweak:
1312 return h->root.u.def.section;
1314 case bfd_link_hash_common:
1315 return h->root.u.c.p->section;
1322 /* Update the got entry reference counts for the section being removed. */
1325 elf32_crx_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED,
1326 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1327 asection *sec ATTRIBUTE_UNUSED,
1328 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED)
1330 /* We don't support garbage collection of GOT and PLT relocs yet. */
1334 /* Definitions for setting CRX target vector. */
1335 #define TARGET_LITTLE_SYM bfd_elf32_crx_vec
1336 #define TARGET_LITTLE_NAME "elf32-crx"
1337 #define ELF_ARCH bfd_arch_crx
1338 #define ELF_MACHINE_CODE EM_CRX
1339 #define ELF_MAXPAGESIZE 0x1
1340 #define elf_symbol_leading_char '_'
1342 #define bfd_elf32_bfd_reloc_type_lookup elf_crx_reloc_type_lookup
1343 #define elf_info_to_howto elf_crx_info_to_howto
1344 #define elf_info_to_howto_rel 0
1345 #define elf_backend_relocate_section elf32_crx_relocate_section
1346 #define bfd_elf32_bfd_relax_section elf32_crx_relax_section
1347 #define bfd_elf32_bfd_get_relocated_section_contents \
1348 elf32_crx_get_relocated_section_contents
1349 #define elf_backend_gc_mark_hook elf32_crx_gc_mark_hook
1350 #define elf_backend_gc_sweep_hook elf32_crx_gc_sweep_hook
1351 #define elf_backend_can_gc_sections 1
1352 #define elf_backend_rela_normal 1
1354 #include "elf32-target.h"