1 /* BFD back-end for Renesas H8/300 ELF binaries.
2 Copyright 1993, 1995, 1998, 1999, 2001, 2002, 2003, 2004
3 Free Software Foundation, Inc.
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. */
27 static reloc_howto_type *elf32_h8_reloc_type_lookup
28 (bfd *abfd, bfd_reloc_code_real_type code);
29 static void elf32_h8_info_to_howto
30 (bfd *, arelent *, Elf_Internal_Rela *);
31 static void elf32_h8_info_to_howto_rel
32 (bfd *, arelent *, Elf_Internal_Rela *);
33 static unsigned long elf32_h8_mach (flagword);
34 static void elf32_h8_final_write_processing (bfd *, bfd_boolean);
35 static bfd_boolean elf32_h8_object_p (bfd *);
36 static bfd_boolean elf32_h8_merge_private_bfd_data (bfd *, bfd *);
37 static bfd_boolean elf32_h8_relax_section
38 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
39 static bfd_boolean elf32_h8_relax_delete_bytes
40 (bfd *, asection *, bfd_vma, int);
41 static bfd_boolean elf32_h8_symbol_address_p (bfd *, asection *, bfd_vma);
42 static bfd_byte *elf32_h8_get_relocated_section_contents
43 (bfd *, struct bfd_link_info *, struct bfd_link_order *,
44 bfd_byte *, bfd_boolean, asymbol **);
45 static asection *elf32_h8_gc_mark_hook
46 (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
47 struct elf_link_hash_entry *, Elf_Internal_Sym *);
48 static bfd_boolean elf32_h8_gc_sweep_hook
49 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
50 static bfd_reloc_status_type elf32_h8_final_link_relocate
51 (unsigned long, bfd *, bfd *, asection *,
52 bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
53 struct bfd_link_info *, asection *, int);
54 static bfd_boolean elf32_h8_relocate_section
55 (bfd *, struct bfd_link_info *, bfd *, asection *,
56 bfd_byte *, Elf_Internal_Rela *,
57 Elf_Internal_Sym *, asection **);
58 static bfd_reloc_status_type special
59 (bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **);
61 /* This does not include any relocation information, but should be
62 good enough for GDB or objdump to read the file. */
64 static reloc_howto_type h8_elf_howto_table[] = {
66 HOWTO (R_H8_NONE, /* type */
68 0, /* size (0 = byte, 1 = short, 2 = long) */
70 FALSE, /* pc_relative */
72 complain_overflow_dont,/* complain_on_overflow */
73 special, /* special_function */
74 "R_H8_NONE", /* name */
75 FALSE, /* partial_inplace */
78 FALSE), /* pcrel_offset */
79 #define R_H8_DIR32_X (R_H8_NONE_X + 1)
80 HOWTO (R_H8_DIR32, /* type */
82 2, /* size (0 = byte, 1 = short, 2 = long) */
84 FALSE, /* pc_relative */
86 complain_overflow_dont,/* complain_on_overflow */
87 special, /* special_function */
88 "R_H8_DIR32", /* name */
89 FALSE, /* partial_inplace */
91 0xffffffff, /* dst_mask */
92 FALSE), /* pcrel_offset */
93 #define R_H8_DIR16_X (R_H8_DIR32_X + 1)
94 HOWTO (R_H8_DIR16, /* type */
96 1, /* size (0 = byte, 1 = short, 2 = long) */
98 FALSE, /* pc_relative */
100 complain_overflow_dont,/* complain_on_overflow */
101 special, /* special_function */
102 "R_H8_DIR16", /* name */
103 FALSE, /* partial_inplace */
105 0x0000ffff, /* dst_mask */
106 FALSE), /* pcrel_offset */
107 #define R_H8_DIR8_X (R_H8_DIR16_X + 1)
108 HOWTO (R_H8_DIR8, /* type */
110 0, /* size (0 = byte, 1 = short, 2 = long) */
112 FALSE, /* pc_relative */
114 complain_overflow_dont,/* complain_on_overflow */
115 special, /* special_function */
116 "R_H8_DIR8", /* name */
117 FALSE, /* partial_inplace */
119 0x000000ff, /* dst_mask */
120 FALSE), /* pcrel_offset */
121 #define R_H8_DIR16A8_X (R_H8_DIR8_X + 1)
122 HOWTO (R_H8_DIR16A8, /* type */
124 1, /* size (0 = byte, 1 = short, 2 = long) */
126 FALSE, /* pc_relative */
128 complain_overflow_bitfield, /* complain_on_overflow */
129 special, /* special_function */
130 "R_H8_DIR16A8", /* name */
131 FALSE, /* partial_inplace */
133 0x0000ffff, /* dst_mask */
134 FALSE), /* pcrel_offset */
135 #define R_H8_DIR16R8_X (R_H8_DIR16A8_X + 1)
136 HOWTO (R_H8_DIR16R8, /* type */
138 1, /* size (0 = byte, 1 = short, 2 = long) */
140 FALSE, /* pc_relative */
142 complain_overflow_bitfield, /* complain_on_overflow */
143 special, /* special_function */
144 "R_H8_DIR16R8", /* name */
145 FALSE, /* partial_inplace */
147 0x0000ffff, /* dst_mask */
148 FALSE), /* pcrel_offset */
149 #define R_H8_DIR24A8_X (R_H8_DIR16R8_X + 1)
150 HOWTO (R_H8_DIR24A8, /* type */
152 2, /* size (0 = byte, 1 = short, 2 = long) */
154 FALSE, /* pc_relative */
156 complain_overflow_bitfield, /* complain_on_overflow */
157 special, /* special_function */
158 "R_H8_DIR24A8", /* name */
159 TRUE, /* partial_inplace */
160 0xff000000, /* src_mask */
161 0x00ffffff, /* dst_mask */
162 FALSE), /* pcrel_offset */
163 #define R_H8_DIR24R8_X (R_H8_DIR24A8_X + 1)
164 HOWTO (R_H8_DIR24R8, /* type */
166 2, /* size (0 = byte, 1 = short, 2 = long) */
168 FALSE, /* pc_relative */
170 complain_overflow_bitfield, /* complain_on_overflow */
171 special, /* special_function */
172 "R_H8_DIR24R8", /* name */
173 TRUE, /* partial_inplace */
174 0xff000000, /* src_mask */
175 0x00ffffff, /* dst_mask */
176 FALSE), /* pcrel_offset */
177 #define R_H8_DIR32A16_X (R_H8_DIR24R8_X + 1)
178 HOWTO (R_H8_DIR32A16, /* type */
180 2, /* size (0 = byte, 1 = short, 2 = long) */
182 FALSE, /* pc_relative */
184 complain_overflow_dont,/* complain_on_overflow */
185 special, /* special_function */
186 "R_H8_DIR32A16", /* name */
187 FALSE, /* partial_inplace */
189 0xffffffff, /* dst_mask */
190 FALSE), /* pcrel_offset */
191 #define R_H8_PCREL16_X (R_H8_DIR32A16_X + 1)
192 HOWTO (R_H8_PCREL16, /* type */
194 1, /* size (0 = byte, 1 = short, 2 = long) */
196 TRUE, /* pc_relative */
198 complain_overflow_signed,/* complain_on_overflow */
199 special, /* special_function */
200 "R_H8_PCREL16", /* name */
201 FALSE, /* partial_inplace */
202 0xffff, /* src_mask */
203 0xffff, /* dst_mask */
204 TRUE), /* pcrel_offset */
205 #define R_H8_PCREL8_X (R_H8_PCREL16_X + 1)
206 HOWTO (R_H8_PCREL8, /* type */
208 0, /* size (0 = byte, 1 = short, 2 = long) */
210 TRUE, /* pc_relative */
212 complain_overflow_signed,/* complain_on_overflow */
213 special, /* special_function */
214 "R_H8_PCREL8", /* name */
215 FALSE, /* partial_inplace */
218 TRUE), /* pcrel_offset */
221 /* This structure is used to map BFD reloc codes to H8 ELF relocs. */
223 struct elf_reloc_map {
224 bfd_reloc_code_real_type bfd_reloc_val;
225 unsigned char howto_index;
228 /* An array mapping BFD reloc codes to H8 ELF relocs. */
230 static const struct elf_reloc_map h8_reloc_map[] = {
231 { BFD_RELOC_NONE, R_H8_NONE_X },
232 { BFD_RELOC_32, R_H8_DIR32_X },
233 { BFD_RELOC_16, R_H8_DIR16_X },
234 { BFD_RELOC_8, R_H8_DIR8_X },
235 { BFD_RELOC_H8_DIR16A8, R_H8_DIR16A8_X },
236 { BFD_RELOC_H8_DIR16R8, R_H8_DIR16R8_X },
237 { BFD_RELOC_H8_DIR24A8, R_H8_DIR24A8_X },
238 { BFD_RELOC_H8_DIR24R8, R_H8_DIR24R8_X },
239 { BFD_RELOC_H8_DIR32A16, R_H8_DIR32A16_X },
240 { BFD_RELOC_16_PCREL, R_H8_PCREL16_X },
241 { BFD_RELOC_8_PCREL, R_H8_PCREL8_X },
245 static reloc_howto_type *
246 elf32_h8_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
247 bfd_reloc_code_real_type code)
251 for (i = 0; i < sizeof (h8_reloc_map) / sizeof (struct elf_reloc_map); i++)
253 if (h8_reloc_map[i].bfd_reloc_val == code)
254 return &h8_elf_howto_table[(int) h8_reloc_map[i].howto_index];
260 elf32_h8_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc,
261 Elf_Internal_Rela *elf_reloc)
266 r = ELF32_R_TYPE (elf_reloc->r_info);
267 for (i = 0; i < sizeof (h8_elf_howto_table) / sizeof (reloc_howto_type); i++)
268 if (h8_elf_howto_table[i].type == r)
270 bfd_reloc->howto = &h8_elf_howto_table[i];
277 elf32_h8_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc,
278 Elf_Internal_Rela *elf_reloc ATTRIBUTE_UNUSED)
283 r = ELF32_R_TYPE (elf_reloc->r_info);
284 bfd_reloc->howto = &h8_elf_howto_table[r];
287 /* Special handling for H8/300 relocs.
288 We only come here for pcrel stuff and return normally if not an -r link.
289 When doing -r, we can't do any arithmetic for the pcrel stuff, because
290 we support relaxing on the H8/300 series chips. */
291 static bfd_reloc_status_type
292 special (bfd *abfd ATTRIBUTE_UNUSED,
293 arelent *reloc_entry ATTRIBUTE_UNUSED,
294 asymbol *symbol ATTRIBUTE_UNUSED,
295 PTR data ATTRIBUTE_UNUSED,
296 asection *input_section ATTRIBUTE_UNUSED,
298 char **error_message ATTRIBUTE_UNUSED)
300 if (output_bfd == (bfd *) NULL)
301 return bfd_reloc_continue;
303 /* Adjust the reloc address to that in the output section. */
304 reloc_entry->address += input_section->output_offset;
308 /* Perform a relocation as part of a final link. */
309 static bfd_reloc_status_type
310 elf32_h8_final_link_relocate (unsigned long r_type, bfd *input_bfd,
311 bfd *output_bfd ATTRIBUTE_UNUSED,
312 asection *input_section ATTRIBUTE_UNUSED,
313 bfd_byte *contents, bfd_vma offset,
314 bfd_vma value, bfd_vma addend,
315 struct bfd_link_info *info ATTRIBUTE_UNUSED,
316 asection *sym_sec ATTRIBUTE_UNUSED,
317 int is_local ATTRIBUTE_UNUSED)
319 bfd_byte *hit_data = contents + offset;
330 bfd_put_32 (input_bfd, value, hit_data);
337 bfd_put_16 (input_bfd, value, hit_data);
344 bfd_put_8 (input_bfd, value, hit_data);
350 /* HIT_DATA is the address for the first byte for the relocated
351 value. Subtract 1 so that we can manipulate the data in 32-bit
355 /* Clear out the top byte in value. */
358 /* Retrieve the type byte for value from the section contents. */
359 value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000);
361 /* Now scribble it out in one 32-bit hunk. */
362 bfd_put_32 (input_bfd, value, hit_data);
366 value -= (input_section->output_section->vma
367 + input_section->output_offset);
371 /* The value is relative to the start of the instruction,
372 not the relocation offset. Subtract 2 to account for
376 bfd_put_16 (input_bfd, value, hit_data);
380 value -= (input_section->output_section->vma
381 + input_section->output_offset);
385 /* The value is relative to the start of the instruction,
386 not the relocation offset. Subtract 1 to account for
390 bfd_put_8 (input_bfd, value, hit_data);
394 return bfd_reloc_notsupported;
398 /* Relocate an H8 ELF section. */
400 elf32_h8_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
401 bfd *input_bfd, asection *input_section,
402 bfd_byte *contents, Elf_Internal_Rela *relocs,
403 Elf_Internal_Sym *local_syms,
404 asection **local_sections)
406 Elf_Internal_Shdr *symtab_hdr;
407 struct elf_link_hash_entry **sym_hashes;
408 Elf_Internal_Rela *rel, *relend;
410 if (info->relocatable)
413 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
414 sym_hashes = elf_sym_hashes (input_bfd);
417 relend = relocs + input_section->reloc_count;
418 for (; rel < relend; rel++)
421 unsigned long r_symndx;
422 Elf_Internal_Sym *sym;
424 struct elf_link_hash_entry *h;
426 bfd_reloc_status_type r;
428 /* This is a final link. */
429 r_symndx = ELF32_R_SYM (rel->r_info);
430 r_type = ELF32_R_TYPE (rel->r_info);
434 if (r_symndx < symtab_hdr->sh_info)
436 sym = local_syms + r_symndx;
437 sec = local_sections[r_symndx];
438 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
442 bfd_boolean unresolved_reloc, warned;
444 RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx, symtab_hdr,
445 relocation, sec, unresolved_reloc,
449 r = elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd,
451 contents, rel->r_offset,
452 relocation, rel->r_addend,
453 info, sec, h == NULL);
455 if (r != bfd_reloc_ok)
458 const char *msg = (const char *) 0;
460 reloc_howto_type *howto;
462 elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel);
463 howto = bfd_reloc.howto;
466 name = h->root.root.string;
469 name = (bfd_elf_string_from_elf_section
470 (input_bfd, symtab_hdr->sh_link, sym->st_name));
471 if (name == NULL || *name == '\0')
472 name = bfd_section_name (input_bfd, sec);
477 case bfd_reloc_overflow:
478 if (! ((*info->callbacks->reloc_overflow)
479 (info, name, howto->name, (bfd_vma) 0,
480 input_bfd, input_section, rel->r_offset)))
484 case bfd_reloc_undefined:
485 if (! ((*info->callbacks->undefined_symbol)
486 (info, name, input_bfd, input_section,
487 rel->r_offset, TRUE)))
491 case bfd_reloc_outofrange:
492 msg = _("internal error: out of range error");
495 case bfd_reloc_notsupported:
496 msg = _("internal error: unsupported relocation error");
499 case bfd_reloc_dangerous:
500 msg = _("internal error: dangerous error");
504 msg = _("internal error: unknown error");
508 if (!((*info->callbacks->warning)
509 (info, msg, name, input_bfd, input_section,
520 /* Object files encode the specific H8 model they were compiled
521 for in the ELF flags field.
523 Examine that field and return the proper BFD machine type for
526 elf32_h8_mach (flagword flags)
528 switch (flags & EF_H8_MACH)
530 case E_H8_MACH_H8300:
532 return bfd_mach_h8300;
534 case E_H8_MACH_H8300H:
535 return bfd_mach_h8300h;
537 case E_H8_MACH_H8300S:
538 return bfd_mach_h8300s;
540 case E_H8_MACH_H8300HN:
541 return bfd_mach_h8300hn;
543 case E_H8_MACH_H8300SN:
544 return bfd_mach_h8300sn;
546 case E_H8_MACH_H8300SX:
547 return bfd_mach_h8300sx;
549 case E_H8_MACH_H8300SXN:
550 return bfd_mach_h8300sxn;
554 /* The final processing done just before writing out a H8 ELF object
555 file. We use this opportunity to encode the BFD machine type
556 into the flags field in the object file. */
559 elf32_h8_final_write_processing (bfd *abfd,
560 bfd_boolean linker ATTRIBUTE_UNUSED)
564 switch (bfd_get_mach (abfd))
568 val = E_H8_MACH_H8300;
571 case bfd_mach_h8300h:
572 val = E_H8_MACH_H8300H;
575 case bfd_mach_h8300s:
576 val = E_H8_MACH_H8300S;
579 case bfd_mach_h8300hn:
580 val = E_H8_MACH_H8300HN;
583 case bfd_mach_h8300sn:
584 val = E_H8_MACH_H8300SN;
587 case bfd_mach_h8300sx:
588 val = E_H8_MACH_H8300SX;
591 case bfd_mach_h8300sxn:
592 val = E_H8_MACH_H8300SXN;
596 elf_elfheader (abfd)->e_flags &= ~ (EF_H8_MACH);
597 elf_elfheader (abfd)->e_flags |= val;
600 /* Return nonzero if ABFD represents a valid H8 ELF object file; also
601 record the encoded machine type found in the ELF flags. */
604 elf32_h8_object_p (bfd *abfd)
606 bfd_default_set_arch_mach (abfd, bfd_arch_h8300,
607 elf32_h8_mach (elf_elfheader (abfd)->e_flags));
611 /* Merge backend specific data from an object file to the output
612 object file when linking. The only data we need to copy at this
613 time is the architecture/machine information. */
616 elf32_h8_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
618 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
619 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
622 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
623 && bfd_get_mach (obfd) < bfd_get_mach (ibfd))
625 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
626 bfd_get_mach (ibfd)))
633 /* This function handles relaxing for the H8..
635 There are a few relaxing opportunities available on the H8:
637 jmp/jsr:24 -> bra/bsr:8 2 bytes
638 The jmp may be completely eliminated if the previous insn is a
639 conditional branch to the insn after the jump. In that case
640 we invert the branch and delete the jump and save 4 bytes.
642 bCC:16 -> bCC:8 2 bytes
643 bsr:16 -> bsr:8 2 bytes
645 bset:16 -> bset:8 2 bytes
646 bset:24/32 -> bset:8 4 bytes
647 (also applicable to other bit manipulation instructions)
649 mov.b:16 -> mov.b:8 2 bytes
650 mov.b:24/32 -> mov.b:8 4 bytes
652 bset:24/32 -> bset:16 2 bytes
653 (also applicable to other bit manipulation instructions)
655 mov.[bwl]:24/32 -> mov.[bwl]:16 2 bytes */
658 elf32_h8_relax_section (bfd *abfd, asection *sec,
659 struct bfd_link_info *link_info, bfd_boolean *again)
661 Elf_Internal_Shdr *symtab_hdr;
662 Elf_Internal_Rela *internal_relocs;
663 Elf_Internal_Rela *irel, *irelend;
664 bfd_byte *contents = NULL;
665 Elf_Internal_Sym *isymbuf = NULL;
666 static asection *last_input_section = NULL;
667 static Elf_Internal_Rela *last_reloc = NULL;
669 /* Assume nothing changes. */
672 /* We don't have to do anything for a relocatable link, if
673 this section does not have relocs, or if this is not a
675 if (link_info->relocatable
676 || (sec->flags & SEC_RELOC) == 0
677 || sec->reloc_count == 0
678 || (sec->flags & SEC_CODE) == 0)
681 /* If this is the first time we have been called for this section,
682 initialize the cooked size. */
683 if (sec->_cooked_size == 0)
684 sec->_cooked_size = sec->_raw_size;
686 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
688 /* Get a copy of the native relocations. */
689 internal_relocs = (_bfd_elf_link_read_relocs
690 (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
691 link_info->keep_memory));
692 if (internal_relocs == NULL)
695 if (sec != last_input_section)
698 last_input_section = sec;
700 /* Walk through the relocs looking for relaxing opportunities. */
701 irelend = internal_relocs + sec->reloc_count;
702 for (irel = internal_relocs; irel < irelend; irel++)
706 /* Keep track of the previous reloc so that we can delete
707 some long jumps created by the compiler. */
708 if (irel != internal_relocs)
709 last_reloc = irel - 1;
711 if (ELF32_R_TYPE (irel->r_info) != R_H8_DIR24R8
712 && ELF32_R_TYPE (irel->r_info) != R_H8_PCREL16
713 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR16A8
714 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR24A8
715 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR32A16)
718 /* Get the section contents if we haven't done so already. */
719 if (contents == NULL)
721 /* Get cached copy if it exists. */
722 if (elf_section_data (sec)->this_hdr.contents != NULL)
723 contents = elf_section_data (sec)->this_hdr.contents;
726 /* Go get them off disk. */
727 contents = (bfd_byte *) bfd_malloc (sec->_raw_size);
728 if (contents == NULL)
731 if (! bfd_get_section_contents (abfd, sec, contents,
732 (file_ptr) 0, sec->_raw_size))
737 /* Read this BFD's local symbols if we haven't done so already. */
738 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
740 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
742 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
743 symtab_hdr->sh_info, 0,
749 /* Get the value of the symbol referred to by the reloc. */
750 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
752 /* A local symbol. */
753 Elf_Internal_Sym *isym;
756 isym = isymbuf + ELF32_R_SYM (irel->r_info);
757 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
758 symval = isym->st_value;
759 /* If the reloc is absolute, it will not have
760 a symbol or section associated with it. */
762 symval += sym_sec->output_section->vma
763 + sym_sec->output_offset;
768 struct elf_link_hash_entry *h;
770 /* An external symbol. */
771 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
772 h = elf_sym_hashes (abfd)[indx];
773 BFD_ASSERT (h != NULL);
774 if (h->root.type != bfd_link_hash_defined
775 && h->root.type != bfd_link_hash_defweak)
777 /* This appears to be a reference to an undefined
778 symbol. Just ignore it--it will be caught by the
779 regular reloc processing. */
783 symval = (h->root.u.def.value
784 + h->root.u.def.section->output_section->vma
785 + h->root.u.def.section->output_offset);
788 /* For simplicity of coding, we are going to modify the section
789 contents, the section relocs, and the BFD symbol table. We
790 must tell the rest of the code not to free up this
791 information. It would be possible to instead create a table
792 of changes which have to be made, as is done in coff-mips.c;
793 that would be more work, but would require less memory when
794 the linker is run. */
795 switch (ELF32_R_TYPE (irel->r_info))
797 /* Try to turn a 24-bit absolute branch/call into an 8-bit
798 pc-relative branch/call. */
801 bfd_vma value = symval + irel->r_addend;
804 /* Get the address of this instruction. */
805 dot = (sec->output_section->vma
806 + sec->output_offset + irel->r_offset - 1);
808 /* Compute the distance from this insn to the branch target. */
811 /* If the distance is within -126..+130 inclusive, then we can
812 relax this jump. +130 is valid since the target will move
813 two bytes closer if we do relax this branch. */
814 if ((int) gap >= -126 && (int) gap <= 130)
818 /* Note that we've changed the relocs, section contents,
820 elf_section_data (sec)->relocs = internal_relocs;
821 elf_section_data (sec)->this_hdr.contents = contents;
822 symtab_hdr->contents = (unsigned char *) isymbuf;
824 /* Get the instruction code being relaxed. */
825 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
827 /* If the previous instruction conditionally jumped around
828 this instruction, we may be able to reverse the condition
829 and redirect the previous instruction to the target of
832 Such sequences are used by the compiler to deal with
833 long conditional branches.
835 Only perform this optimisation for jumps (code 0x5a) not
836 subroutine calls, as otherwise it could transform:
849 which changes the call (jsr) into a branch (bne). */
854 && ELF32_R_TYPE (last_reloc->r_info) == R_H8_PCREL8
855 && ELF32_R_SYM (last_reloc->r_info) < symtab_hdr->sh_info)
858 asection *last_sym_sec;
859 Elf_Internal_Sym *last_sym;
861 /* We will need to examine the symbol used by the
862 previous relocation. */
864 last_sym = isymbuf + ELF32_R_SYM (last_reloc->r_info);
866 = bfd_section_from_elf_index (abfd, last_sym->st_shndx);
867 last_value = (last_sym->st_value
868 + last_sym_sec->output_section->vma
869 + last_sym_sec->output_offset);
871 /* Verify that the previous relocation was for a
872 branch around this instruction and that no symbol
873 exists at the current location. */
874 if (last_value == dot + 4
875 && last_reloc->r_offset + 2 == irel->r_offset
876 && ! elf32_h8_symbol_address_p (abfd, sec, dot))
878 /* We can eliminate this jump. Twiddle the
879 previous relocation as necessary. */
881 = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
882 ELF32_R_TYPE (R_H8_NONE));
885 = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
886 ELF32_R_TYPE (R_H8_PCREL8));
887 last_reloc->r_addend = irel->r_addend;
889 code = bfd_get_8 (abfd,
890 contents + last_reloc->r_offset - 1);
894 contents + last_reloc->r_offset - 1);
896 /* Delete four bytes of data. */
897 if (!elf32_h8_relax_delete_bytes (abfd, sec,
909 bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 1);
910 else if (code == 0x5a)
912 bfd_put_8 (abfd, 0x40, contents + irel->r_offset - 1);
916 /* Fix the relocation's type. */
917 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
920 /* Delete two bytes of data. */
921 if (!elf32_h8_relax_delete_bytes (abfd, sec,
922 irel->r_offset + 1, 2))
925 /* That will change things, so, we should relax again.
926 Note that this is not required, and it may be slow. */
932 /* Try to turn a 16-bit pc-relative branch into a 8-bit pc-relative
936 bfd_vma value = symval + irel->r_addend;
940 /* Get the address of this instruction. */
941 dot = (sec->output_section->vma
943 + irel->r_offset - 2);
947 /* If the distance is within -126..+130 inclusive, then we can
948 relax this jump. +130 is valid since the target will move
949 two bytes closer if we do relax this branch. */
950 if ((int) gap >= -126 && (int) gap <= 130)
954 /* Note that we've changed the relocs, section contents,
956 elf_section_data (sec)->relocs = internal_relocs;
957 elf_section_data (sec)->this_hdr.contents = contents;
958 symtab_hdr->contents = (unsigned char *) isymbuf;
960 /* Get the opcode. */
961 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
965 /* bCC:16 -> bCC:8 */
966 /* Get the second byte of the original insn, which
967 contains the condition code. */
968 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
970 /* Compute the fisrt byte of the relaxed
971 instruction. The original sequence 0x58 0xX0
972 is relaxed to 0x4X, where X represents the
977 bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
979 else if (code == 0x5c)
981 bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 2);
985 /* Fix the relocation's type. */
986 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
990 /* Delete two bytes of data. */
991 if (!elf32_h8_relax_delete_bytes (abfd, sec,
992 irel->r_offset + 1, 2))
995 /* That will change things, so, we should relax again.
996 Note that this is not required, and it may be slow. */
1002 /* This is a 16-bit absolute address in one of the following
1005 "band", "bclr", "biand", "bild", "bior", "bist", "bixor",
1006 "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
1009 We may relax this into an 8-bit absolute address if it's in
1015 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1016 if (value >= 0xffffff00u)
1019 unsigned char temp_code;
1021 /* Note that we've changed the relocs, section contents,
1023 elf_section_data (sec)->relocs = internal_relocs;
1024 elf_section_data (sec)->this_hdr.contents = contents;
1025 symtab_hdr->contents = (unsigned char *) isymbuf;
1027 /* Get the opcode. */
1028 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
1030 /* All instructions with R_H8_DIR16A8 start with
1035 temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1036 /* If this is a mov.b instruction, clear the lower
1037 nibble, which contains the source/destination
1039 if ((temp_code & 0x10) != 0x10)
1045 /* This is mov.b @aa:16,Rd. */
1046 bfd_put_8 (abfd, (code & 0xf) | 0x20,
1047 contents + irel->r_offset - 2);
1050 /* This is mov.b Rs,@aa:16. */
1051 bfd_put_8 (abfd, (code & 0xf) | 0x30,
1052 contents + irel->r_offset - 2);
1055 /* This is a bit-maniputation instruction that
1056 stores one bit into memory, one of "bclr",
1057 "bist", "bnot", "bset", and "bst". */
1058 bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
1061 /* This is a bit-maniputation instruction that
1062 loads one bit from memory, one of "band",
1063 "biand", "bild", "bior", "bixor", "bld", "bor",
1064 "btst", and "bxor". */
1065 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
1071 /* Fix the relocation's type. */
1072 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1075 /* Move the relocation. */
1078 /* Delete two bytes of data. */
1079 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1080 irel->r_offset + 1, 2))
1083 /* That will change things, so, we should relax again.
1084 Note that this is not required, and it may be slow. */
1090 /* This is a 24-bit absolute address in one of the following
1093 "band", "bclr", "biand", "bild", "bior", "bist", "bixor",
1094 "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
1097 We may relax this into an 8-bit absolute address if it's in
1103 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1104 if (value >= 0xffffff00u)
1107 unsigned char temp_code;
1109 /* Note that we've changed the relocs, section contents,
1111 elf_section_data (sec)->relocs = internal_relocs;
1112 elf_section_data (sec)->this_hdr.contents = contents;
1113 symtab_hdr->contents = (unsigned char *) isymbuf;
1115 /* Get the opcode. */
1116 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
1118 /* All instructions with R_H8_DIR24A8 start with
1123 temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1125 /* If this is a mov.b instruction, clear the lower
1126 nibble, which contains the source/destination
1128 if ((temp_code & 0x30) != 0x30)
1134 /* This is mov.b @aa:24/32,Rd. */
1135 bfd_put_8 (abfd, (code & 0xf) | 0x20,
1136 contents + irel->r_offset - 2);
1139 /* This is mov.b Rs,@aa:24/32. */
1140 bfd_put_8 (abfd, (code & 0xf) | 0x30,
1141 contents + irel->r_offset - 2);
1144 /* This is a bit-maniputation instruction that
1145 stores one bit into memory, one of "bclr",
1146 "bist", "bnot", "bset", and "bst". */
1147 bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
1150 /* This is a bit-maniputation instruction that
1151 loads one bit from memory, one of "band",
1152 "biand", "bild", "bior", "bixor", "bld", "bor",
1153 "btst", and "bxor". */
1154 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
1160 /* Fix the relocation's type. */
1161 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1165 /* Delete two bytes of data. */
1166 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1167 irel->r_offset + 1, 4))
1170 /* That will change things, so, we should relax again.
1171 Note that this is not required, and it may be slow. */
1179 /* This is a 24-/32-bit absolute address in one of the
1180 following instructions:
1182 "band", "bclr", "biand", "bild", "bior", "bist",
1183 "bixor", "bld", "bnot", "bor", "bset", "bst", "btst",
1184 "bxor", "ldc.w", "stc.w" and "mov.[bwl]"
1186 We may relax this into an 16-bit absolute address if it's
1187 in the right range. */
1192 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1193 if (value <= 0x7fff || value >= 0xffff8000u)
1197 /* Note that we've changed the relocs, section contents,
1199 elf_section_data (sec)->relocs = internal_relocs;
1200 elf_section_data (sec)->this_hdr.contents = contents;
1201 symtab_hdr->contents = (unsigned char *) isymbuf;
1203 /* Get the opcode. */
1204 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1206 /* Fix the opcode. For all the instructions that
1207 belong to this relaxation, we simply need to turn
1208 off bit 0x20 in the previous byte. */
1211 bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
1213 /* Fix the relocation's type. */
1214 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1217 /* Delete two bytes of data. */
1218 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1219 irel->r_offset + 1, 2))
1222 /* That will change things, so, we should relax again.
1223 Note that this is not required, and it may be slow. */
1235 && symtab_hdr->contents != (unsigned char *) isymbuf)
1237 if (! link_info->keep_memory)
1240 symtab_hdr->contents = (unsigned char *) isymbuf;
1243 if (contents != NULL
1244 && elf_section_data (sec)->this_hdr.contents != contents)
1246 if (! link_info->keep_memory)
1250 /* Cache the section contents for elf_link_input_bfd. */
1251 elf_section_data (sec)->this_hdr.contents = contents;
1255 if (internal_relocs != NULL
1256 && elf_section_data (sec)->relocs != internal_relocs)
1257 free (internal_relocs);
1263 && symtab_hdr->contents != (unsigned char *) isymbuf)
1265 if (contents != NULL
1266 && elf_section_data (sec)->this_hdr.contents != contents)
1268 if (internal_relocs != NULL
1269 && elf_section_data (sec)->relocs != internal_relocs)
1270 free (internal_relocs);
1274 /* Delete some bytes from a section while relaxing. */
1277 elf32_h8_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count)
1279 Elf_Internal_Shdr *symtab_hdr;
1280 unsigned int sec_shndx;
1282 Elf_Internal_Rela *irel, *irelend;
1283 Elf_Internal_Rela *irelalign;
1284 Elf_Internal_Sym *isym;
1285 Elf_Internal_Sym *isymend;
1287 struct elf_link_hash_entry **sym_hashes;
1288 struct elf_link_hash_entry **end_hashes;
1289 unsigned int symcount;
1291 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1293 contents = elf_section_data (sec)->this_hdr.contents;
1295 /* The deletion must stop at the next ALIGN reloc for an aligment
1296 power larger than the number of bytes we are deleting. */
1299 toaddr = sec->_cooked_size;
1301 irel = elf_section_data (sec)->relocs;
1302 irelend = irel + sec->reloc_count;
1304 /* Actually delete the bytes. */
1305 memmove (contents + addr, contents + addr + count,
1306 (size_t) (toaddr - addr - count));
1307 sec->_cooked_size -= count;
1309 /* Adjust all the relocs. */
1310 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
1312 /* Get the new reloc address. */
1313 if ((irel->r_offset > addr
1314 && irel->r_offset < toaddr))
1315 irel->r_offset -= count;
1318 /* Adjust the local symbols defined in this section. */
1319 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1320 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
1321 isymend = isym + symtab_hdr->sh_info;
1322 for (; isym < isymend; isym++)
1324 if (isym->st_shndx == sec_shndx
1325 && isym->st_value > addr
1326 && isym->st_value < toaddr)
1327 isym->st_value -= count;
1330 /* Now adjust the global symbols defined in this section. */
1331 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1332 - symtab_hdr->sh_info);
1333 sym_hashes = elf_sym_hashes (abfd);
1334 end_hashes = sym_hashes + symcount;
1335 for (; sym_hashes < end_hashes; sym_hashes++)
1337 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1338 if ((sym_hash->root.type == bfd_link_hash_defined
1339 || sym_hash->root.type == bfd_link_hash_defweak)
1340 && sym_hash->root.u.def.section == sec
1341 && sym_hash->root.u.def.value > addr
1342 && sym_hash->root.u.def.value < toaddr)
1344 sym_hash->root.u.def.value -= count;
1351 /* Return TRUE if a symbol exists at the given address, else return
1354 elf32_h8_symbol_address_p (bfd *abfd, asection *sec, bfd_vma addr)
1356 Elf_Internal_Shdr *symtab_hdr;
1357 unsigned int sec_shndx;
1358 Elf_Internal_Sym *isym;
1359 Elf_Internal_Sym *isymend;
1360 struct elf_link_hash_entry **sym_hashes;
1361 struct elf_link_hash_entry **end_hashes;
1362 unsigned int symcount;
1364 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1366 /* Examine all the symbols. */
1367 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1368 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
1369 isymend = isym + symtab_hdr->sh_info;
1370 for (; isym < isymend; isym++)
1372 if (isym->st_shndx == sec_shndx
1373 && isym->st_value == addr)
1377 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1378 - symtab_hdr->sh_info);
1379 sym_hashes = elf_sym_hashes (abfd);
1380 end_hashes = sym_hashes + symcount;
1381 for (; sym_hashes < end_hashes; sym_hashes++)
1383 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1384 if ((sym_hash->root.type == bfd_link_hash_defined
1385 || sym_hash->root.type == bfd_link_hash_defweak)
1386 && sym_hash->root.u.def.section == sec
1387 && sym_hash->root.u.def.value == addr)
1394 /* This is a version of bfd_generic_get_relocated_section_contents
1395 which uses elf32_h8_relocate_section. */
1398 elf32_h8_get_relocated_section_contents (bfd *output_bfd,
1399 struct bfd_link_info *link_info,
1400 struct bfd_link_order *link_order,
1402 bfd_boolean relocatable,
1405 Elf_Internal_Shdr *symtab_hdr;
1406 asection *input_section = link_order->u.indirect.section;
1407 bfd *input_bfd = input_section->owner;
1408 asection **sections = NULL;
1409 Elf_Internal_Rela *internal_relocs = NULL;
1410 Elf_Internal_Sym *isymbuf = NULL;
1412 /* We only need to handle the case of relaxing, or of having a
1413 particular set of section contents, specially. */
1415 || elf_section_data (input_section)->this_hdr.contents == NULL)
1416 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
1421 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1423 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
1424 (size_t) input_section->_raw_size);
1426 if ((input_section->flags & SEC_RELOC) != 0
1427 && input_section->reloc_count > 0)
1430 Elf_Internal_Sym *isym, *isymend;
1433 internal_relocs = (_bfd_elf_link_read_relocs
1434 (input_bfd, input_section, (PTR) NULL,
1435 (Elf_Internal_Rela *) NULL, FALSE));
1436 if (internal_relocs == NULL)
1439 if (symtab_hdr->sh_info != 0)
1441 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1442 if (isymbuf == NULL)
1443 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
1444 symtab_hdr->sh_info, 0,
1446 if (isymbuf == NULL)
1450 amt = symtab_hdr->sh_info;
1451 amt *= sizeof (asection *);
1452 sections = (asection **) bfd_malloc (amt);
1453 if (sections == NULL && amt != 0)
1456 isymend = isymbuf + symtab_hdr->sh_info;
1457 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
1461 if (isym->st_shndx == SHN_UNDEF)
1462 isec = bfd_und_section_ptr;
1463 else if (isym->st_shndx == SHN_ABS)
1464 isec = bfd_abs_section_ptr;
1465 else if (isym->st_shndx == SHN_COMMON)
1466 isec = bfd_com_section_ptr;
1468 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
1473 if (! elf32_h8_relocate_section (output_bfd, link_info, input_bfd,
1474 input_section, data, internal_relocs,
1478 if (sections != NULL)
1481 && symtab_hdr->contents != (unsigned char *) isymbuf)
1483 if (elf_section_data (input_section)->relocs != internal_relocs)
1484 free (internal_relocs);
1490 if (sections != NULL)
1493 && symtab_hdr->contents != (unsigned char *) isymbuf)
1495 if (internal_relocs != NULL
1496 && elf_section_data (input_section)->relocs != internal_relocs)
1497 free (internal_relocs);
1502 elf32_h8_gc_mark_hook (asection *sec,
1503 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1504 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
1505 struct elf_link_hash_entry *h,
1506 Elf_Internal_Sym *sym)
1510 switch (h->root.type)
1512 case bfd_link_hash_defined:
1513 case bfd_link_hash_defweak:
1514 return h->root.u.def.section;
1516 case bfd_link_hash_common:
1517 return h->root.u.c.p->section;
1524 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1529 elf32_h8_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED,
1530 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1531 asection *sec ATTRIBUTE_UNUSED,
1532 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED)
1538 #define TARGET_BIG_SYM bfd_elf32_h8300_vec
1539 #define TARGET_BIG_NAME "elf32-h8300"
1540 #define ELF_ARCH bfd_arch_h8300
1541 #define ELF_MACHINE_CODE EM_H8_300
1542 #define ELF_MAXPAGESIZE 0x1
1543 #define bfd_elf32_bfd_reloc_type_lookup elf32_h8_reloc_type_lookup
1544 #define elf_info_to_howto elf32_h8_info_to_howto
1545 #define elf_info_to_howto_rel elf32_h8_info_to_howto_rel
1547 /* So we can set/examine bits in e_flags to get the specific
1548 H8 architecture in use. */
1549 #define elf_backend_final_write_processing \
1550 elf32_h8_final_write_processing
1551 #define elf_backend_object_p \
1553 #define bfd_elf32_bfd_merge_private_bfd_data \
1554 elf32_h8_merge_private_bfd_data
1555 #define elf_backend_gc_mark_hook elf32_h8_gc_mark_hook
1556 #define elf_backend_gc_sweep_hook elf32_h8_gc_sweep_hook
1558 /* ??? when elf_backend_relocate_section is not defined, elf32-target.h
1559 defaults to using _bfd_generic_link_hash_table_create, but
1560 elflink.h:bfd_elf32_size_dynamic_sections uses
1561 dynobj = elf_hash_table (info)->dynobj;
1562 and thus requires an elf hash table. */
1563 #define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create
1565 /* Use an H8 specific linker, not the ELF generic linker. */
1566 #define elf_backend_relocate_section elf32_h8_relocate_section
1567 #define elf_backend_rela_normal 1
1568 #define elf_backend_can_gc_sections 1
1570 /* And relaxing stuff. */
1571 #define bfd_elf32_bfd_relax_section elf32_h8_relax_section
1572 #define bfd_elf32_bfd_get_relocated_section_contents \
1573 elf32_h8_get_relocated_section_contents
1576 #include "elf32-target.h"