1 /* BFD back-end for Renesas H8/300 ELF binaries.
2 Copyright 1993, 1995, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
3 2007, 2008, 2009, 2010, 2012 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 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. */
28 static reloc_howto_type *elf32_h8_reloc_type_lookup
29 (bfd *abfd, bfd_reloc_code_real_type code);
30 static void elf32_h8_info_to_howto
31 (bfd *, arelent *, Elf_Internal_Rela *);
32 static void elf32_h8_info_to_howto_rel
33 (bfd *, arelent *, Elf_Internal_Rela *);
34 static unsigned long elf32_h8_mach (flagword);
35 static void elf32_h8_final_write_processing (bfd *, bfd_boolean);
36 static bfd_boolean elf32_h8_object_p (bfd *);
37 static bfd_boolean elf32_h8_merge_private_bfd_data (bfd *, bfd *);
38 static bfd_boolean elf32_h8_relax_section
39 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
40 static bfd_boolean elf32_h8_relax_delete_bytes
41 (bfd *, asection *, bfd_vma, int);
42 static bfd_boolean elf32_h8_symbol_address_p (bfd *, asection *, bfd_vma);
43 static bfd_byte *elf32_h8_get_relocated_section_contents
44 (bfd *, struct bfd_link_info *, struct bfd_link_order *,
45 bfd_byte *, bfd_boolean, asymbol **);
46 static bfd_reloc_status_type elf32_h8_final_link_relocate
47 (unsigned long, bfd *, bfd *, asection *,
48 bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
49 struct bfd_link_info *, asection *, int);
50 static bfd_boolean elf32_h8_relocate_section
51 (bfd *, struct bfd_link_info *, bfd *, asection *,
52 bfd_byte *, Elf_Internal_Rela *,
53 Elf_Internal_Sym *, asection **);
54 static bfd_reloc_status_type special
55 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
57 /* This does not include any relocation information, but should be
58 good enough for GDB or objdump to read the file. */
60 static reloc_howto_type h8_elf_howto_table[] =
63 HOWTO (R_H8_NONE, /* type */
65 0, /* size (0 = byte, 1 = short, 2 = long) */
67 FALSE, /* pc_relative */
69 complain_overflow_dont,/* complain_on_overflow */
70 special, /* special_function */
71 "R_H8_NONE", /* name */
72 FALSE, /* partial_inplace */
75 FALSE), /* pcrel_offset */
76 #define R_H8_DIR32_X (R_H8_NONE_X + 1)
77 HOWTO (R_H8_DIR32, /* type */
79 2, /* size (0 = byte, 1 = short, 2 = long) */
81 FALSE, /* pc_relative */
83 complain_overflow_dont,/* complain_on_overflow */
84 special, /* special_function */
85 "R_H8_DIR32", /* name */
86 FALSE, /* partial_inplace */
88 0xffffffff, /* dst_mask */
89 FALSE), /* pcrel_offset */
90 #define R_H8_DIR16_X (R_H8_DIR32_X + 1)
91 HOWTO (R_H8_DIR16, /* type */
93 1, /* size (0 = byte, 1 = short, 2 = long) */
95 FALSE, /* pc_relative */
97 complain_overflow_dont,/* complain_on_overflow */
98 special, /* special_function */
99 "R_H8_DIR16", /* name */
100 FALSE, /* partial_inplace */
102 0x0000ffff, /* dst_mask */
103 FALSE), /* pcrel_offset */
104 #define R_H8_DIR8_X (R_H8_DIR16_X + 1)
105 HOWTO (R_H8_DIR8, /* type */
107 0, /* size (0 = byte, 1 = short, 2 = long) */
109 FALSE, /* pc_relative */
111 complain_overflow_dont,/* complain_on_overflow */
112 special, /* special_function */
113 "R_H8_DIR8", /* name */
114 FALSE, /* partial_inplace */
116 0x000000ff, /* dst_mask */
117 FALSE), /* pcrel_offset */
118 #define R_H8_DIR16A8_X (R_H8_DIR8_X + 1)
119 HOWTO (R_H8_DIR16A8, /* type */
121 1, /* size (0 = byte, 1 = short, 2 = long) */
123 FALSE, /* pc_relative */
125 complain_overflow_bitfield, /* complain_on_overflow */
126 special, /* special_function */
127 "R_H8_DIR16A8", /* name */
128 FALSE, /* partial_inplace */
130 0x0000ffff, /* dst_mask */
131 FALSE), /* pcrel_offset */
132 #define R_H8_DIR16R8_X (R_H8_DIR16A8_X + 1)
133 HOWTO (R_H8_DIR16R8, /* type */
135 1, /* size (0 = byte, 1 = short, 2 = long) */
137 FALSE, /* pc_relative */
139 complain_overflow_bitfield, /* complain_on_overflow */
140 special, /* special_function */
141 "R_H8_DIR16R8", /* name */
142 FALSE, /* partial_inplace */
144 0x0000ffff, /* dst_mask */
145 FALSE), /* pcrel_offset */
146 #define R_H8_DIR24A8_X (R_H8_DIR16R8_X + 1)
147 HOWTO (R_H8_DIR24A8, /* type */
149 2, /* size (0 = byte, 1 = short, 2 = long) */
151 FALSE, /* pc_relative */
153 complain_overflow_bitfield, /* complain_on_overflow */
154 special, /* special_function */
155 "R_H8_DIR24A8", /* name */
156 TRUE, /* partial_inplace */
157 0xff000000, /* src_mask */
158 0x00ffffff, /* dst_mask */
159 FALSE), /* pcrel_offset */
160 #define R_H8_DIR24R8_X (R_H8_DIR24A8_X + 1)
161 HOWTO (R_H8_DIR24R8, /* type */
163 2, /* size (0 = byte, 1 = short, 2 = long) */
165 FALSE, /* pc_relative */
167 complain_overflow_bitfield, /* complain_on_overflow */
168 special, /* special_function */
169 "R_H8_DIR24R8", /* name */
170 TRUE, /* partial_inplace */
171 0xff000000, /* src_mask */
172 0x00ffffff, /* dst_mask */
173 FALSE), /* pcrel_offset */
174 #define R_H8_DIR32A16_X (R_H8_DIR24R8_X + 1)
175 HOWTO (R_H8_DIR32A16, /* type */
177 2, /* size (0 = byte, 1 = short, 2 = long) */
179 FALSE, /* pc_relative */
181 complain_overflow_dont,/* complain_on_overflow */
182 special, /* special_function */
183 "R_H8_DIR32A16", /* name */
184 FALSE, /* partial_inplace */
186 0xffffffff, /* dst_mask */
187 FALSE), /* pcrel_offset */
188 #define R_H8_PCREL16_X (R_H8_DIR32A16_X + 1)
189 HOWTO (R_H8_PCREL16, /* type */
191 1, /* size (0 = byte, 1 = short, 2 = long) */
193 TRUE, /* pc_relative */
195 complain_overflow_signed,/* complain_on_overflow */
196 special, /* special_function */
197 "R_H8_PCREL16", /* name */
198 FALSE, /* partial_inplace */
199 0xffff, /* src_mask */
200 0xffff, /* dst_mask */
201 TRUE), /* pcrel_offset */
202 #define R_H8_PCREL8_X (R_H8_PCREL16_X + 1)
203 HOWTO (R_H8_PCREL8, /* type */
205 0, /* size (0 = byte, 1 = short, 2 = long) */
207 TRUE, /* pc_relative */
209 complain_overflow_signed,/* complain_on_overflow */
210 special, /* special_function */
211 "R_H8_PCREL8", /* name */
212 FALSE, /* partial_inplace */
215 TRUE), /* pcrel_offset */
218 /* This structure is used to map BFD reloc codes to H8 ELF relocs. */
220 struct elf_reloc_map {
221 bfd_reloc_code_real_type bfd_reloc_val;
222 unsigned char howto_index;
225 /* An array mapping BFD reloc codes to H8 ELF relocs. */
227 static const struct elf_reloc_map h8_reloc_map[] = {
228 { BFD_RELOC_NONE, R_H8_NONE_X },
229 { BFD_RELOC_32, R_H8_DIR32_X },
230 { BFD_RELOC_16, R_H8_DIR16_X },
231 { BFD_RELOC_8, R_H8_DIR8_X },
232 { BFD_RELOC_H8_DIR16A8, R_H8_DIR16A8_X },
233 { BFD_RELOC_H8_DIR16R8, R_H8_DIR16R8_X },
234 { BFD_RELOC_H8_DIR24A8, R_H8_DIR24A8_X },
235 { BFD_RELOC_H8_DIR24R8, R_H8_DIR24R8_X },
236 { BFD_RELOC_H8_DIR32A16, R_H8_DIR32A16_X },
237 { BFD_RELOC_16_PCREL, R_H8_PCREL16_X },
238 { BFD_RELOC_8_PCREL, R_H8_PCREL8_X },
242 static reloc_howto_type *
243 elf32_h8_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
244 bfd_reloc_code_real_type code)
248 for (i = 0; i < sizeof (h8_reloc_map) / sizeof (struct elf_reloc_map); i++)
250 if (h8_reloc_map[i].bfd_reloc_val == code)
251 return &h8_elf_howto_table[(int) h8_reloc_map[i].howto_index];
256 static reloc_howto_type *
257 elf32_h8_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
263 i < sizeof (h8_elf_howto_table) / sizeof (h8_elf_howto_table[0]);
265 if (h8_elf_howto_table[i].name != NULL
266 && strcasecmp (h8_elf_howto_table[i].name, r_name) == 0)
267 return &h8_elf_howto_table[i];
273 elf32_h8_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc,
274 Elf_Internal_Rela *elf_reloc)
279 r = ELF32_R_TYPE (elf_reloc->r_info);
280 for (i = 0; i < sizeof (h8_elf_howto_table) / sizeof (reloc_howto_type); i++)
281 if (h8_elf_howto_table[i].type == r)
283 bfd_reloc->howto = &h8_elf_howto_table[i];
290 elf32_h8_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc,
291 Elf_Internal_Rela *elf_reloc ATTRIBUTE_UNUSED)
296 r = ELF32_R_TYPE (elf_reloc->r_info);
297 bfd_reloc->howto = &h8_elf_howto_table[r];
300 /* Special handling for H8/300 relocs.
301 We only come here for pcrel stuff and return normally if not an -r link.
302 When doing -r, we can't do any arithmetic for the pcrel stuff, because
303 we support relaxing on the H8/300 series chips. */
304 static bfd_reloc_status_type
305 special (bfd *abfd ATTRIBUTE_UNUSED,
306 arelent *reloc_entry ATTRIBUTE_UNUSED,
307 asymbol *symbol ATTRIBUTE_UNUSED,
308 void * data ATTRIBUTE_UNUSED,
309 asection *input_section ATTRIBUTE_UNUSED,
311 char **error_message ATTRIBUTE_UNUSED)
313 if (output_bfd == (bfd *) NULL)
314 return bfd_reloc_continue;
316 /* Adjust the reloc address to that in the output section. */
317 reloc_entry->address += input_section->output_offset;
321 /* Perform a relocation as part of a final link. */
322 static bfd_reloc_status_type
323 elf32_h8_final_link_relocate (unsigned long r_type, bfd *input_bfd,
324 bfd *output_bfd ATTRIBUTE_UNUSED,
325 asection *input_section ATTRIBUTE_UNUSED,
326 bfd_byte *contents, bfd_vma offset,
327 bfd_vma value, bfd_vma addend,
328 struct bfd_link_info *info ATTRIBUTE_UNUSED,
329 asection *sym_sec ATTRIBUTE_UNUSED,
330 int is_local ATTRIBUTE_UNUSED)
332 bfd_byte *hit_data = contents + offset;
343 bfd_put_32 (input_bfd, value, hit_data);
350 bfd_put_16 (input_bfd, value, hit_data);
357 bfd_put_8 (input_bfd, value, hit_data);
363 /* HIT_DATA is the address for the first byte for the relocated
364 value. Subtract 1 so that we can manipulate the data in 32-bit
368 /* Clear out the top byte in value. */
371 /* Retrieve the type byte for value from the section contents. */
372 value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000);
374 /* Now scribble it out in one 32-bit hunk. */
375 bfd_put_32 (input_bfd, value, hit_data);
379 value -= (input_section->output_section->vma
380 + input_section->output_offset);
384 /* The value is relative to the start of the instruction,
385 not the relocation offset. Subtract 2 to account for
389 bfd_put_16 (input_bfd, value, hit_data);
393 value -= (input_section->output_section->vma
394 + input_section->output_offset);
398 /* The value is relative to the start of the instruction,
399 not the relocation offset. Subtract 1 to account for
403 bfd_put_8 (input_bfd, value, hit_data);
407 return bfd_reloc_notsupported;
411 /* Relocate an H8 ELF section. */
413 elf32_h8_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
414 bfd *input_bfd, asection *input_section,
415 bfd_byte *contents, Elf_Internal_Rela *relocs,
416 Elf_Internal_Sym *local_syms,
417 asection **local_sections)
419 Elf_Internal_Shdr *symtab_hdr;
420 struct elf_link_hash_entry **sym_hashes;
421 Elf_Internal_Rela *rel, *relend;
423 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
424 sym_hashes = elf_sym_hashes (input_bfd);
427 relend = relocs + input_section->reloc_count;
428 for (; rel < relend; rel++)
431 unsigned long r_symndx;
432 Elf_Internal_Sym *sym;
434 struct elf_link_hash_entry *h;
436 bfd_reloc_status_type r;
438 reloc_howto_type *howto;
440 elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel);
441 howto = bfd_reloc.howto;
443 r_symndx = ELF32_R_SYM (rel->r_info);
444 r_type = ELF32_R_TYPE (rel->r_info);
448 if (r_symndx < symtab_hdr->sh_info)
450 sym = local_syms + r_symndx;
451 sec = local_sections[r_symndx];
452 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
456 bfd_boolean unresolved_reloc, warned;
458 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
459 r_symndx, symtab_hdr, sym_hashes,
461 unresolved_reloc, warned);
464 if (sec != NULL && discarded_section (sec))
465 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
466 rel, 1, relend, howto, 0, contents);
468 if (info->relocatable)
471 r = elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd,
473 contents, rel->r_offset,
474 relocation, rel->r_addend,
475 info, sec, h == NULL);
477 if (r != bfd_reloc_ok)
480 const char *msg = (const char *) 0;
483 name = h->root.root.string;
486 name = (bfd_elf_string_from_elf_section
487 (input_bfd, symtab_hdr->sh_link, sym->st_name));
488 if (name == NULL || *name == '\0')
489 name = bfd_section_name (input_bfd, sec);
494 case bfd_reloc_overflow:
495 if (! ((*info->callbacks->reloc_overflow)
496 (info, (h ? &h->root : NULL), name, howto->name,
497 (bfd_vma) 0, input_bfd, input_section,
502 case bfd_reloc_undefined:
503 if (! ((*info->callbacks->undefined_symbol)
504 (info, name, input_bfd, input_section,
505 rel->r_offset, TRUE)))
509 case bfd_reloc_outofrange:
510 msg = _("internal error: out of range error");
513 case bfd_reloc_notsupported:
514 msg = _("internal error: unsupported relocation error");
517 case bfd_reloc_dangerous:
518 msg = _("internal error: dangerous error");
522 msg = _("internal error: unknown error");
526 if (!((*info->callbacks->warning)
527 (info, msg, name, input_bfd, input_section,
538 /* Object files encode the specific H8 model they were compiled
539 for in the ELF flags field.
541 Examine that field and return the proper BFD machine type for
544 elf32_h8_mach (flagword flags)
546 switch (flags & EF_H8_MACH)
548 case E_H8_MACH_H8300:
550 return bfd_mach_h8300;
552 case E_H8_MACH_H8300H:
553 return bfd_mach_h8300h;
555 case E_H8_MACH_H8300S:
556 return bfd_mach_h8300s;
558 case E_H8_MACH_H8300HN:
559 return bfd_mach_h8300hn;
561 case E_H8_MACH_H8300SN:
562 return bfd_mach_h8300sn;
564 case E_H8_MACH_H8300SX:
565 return bfd_mach_h8300sx;
567 case E_H8_MACH_H8300SXN:
568 return bfd_mach_h8300sxn;
572 /* The final processing done just before writing out a H8 ELF object
573 file. We use this opportunity to encode the BFD machine type
574 into the flags field in the object file. */
577 elf32_h8_final_write_processing (bfd *abfd,
578 bfd_boolean linker ATTRIBUTE_UNUSED)
582 switch (bfd_get_mach (abfd))
586 val = E_H8_MACH_H8300;
589 case bfd_mach_h8300h:
590 val = E_H8_MACH_H8300H;
593 case bfd_mach_h8300s:
594 val = E_H8_MACH_H8300S;
597 case bfd_mach_h8300hn:
598 val = E_H8_MACH_H8300HN;
601 case bfd_mach_h8300sn:
602 val = E_H8_MACH_H8300SN;
605 case bfd_mach_h8300sx:
606 val = E_H8_MACH_H8300SX;
609 case bfd_mach_h8300sxn:
610 val = E_H8_MACH_H8300SXN;
614 elf_elfheader (abfd)->e_flags &= ~ (EF_H8_MACH);
615 elf_elfheader (abfd)->e_flags |= val;
618 /* Return nonzero if ABFD represents a valid H8 ELF object file; also
619 record the encoded machine type found in the ELF flags. */
622 elf32_h8_object_p (bfd *abfd)
624 bfd_default_set_arch_mach (abfd, bfd_arch_h8300,
625 elf32_h8_mach (elf_elfheader (abfd)->e_flags));
629 /* Merge backend specific data from an object file to the output
630 object file when linking. The only data we need to copy at this
631 time is the architecture/machine information. */
634 elf32_h8_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
636 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
637 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
640 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
641 && bfd_get_mach (obfd) < bfd_get_mach (ibfd))
643 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
644 bfd_get_mach (ibfd)))
651 /* This function handles relaxing for the H8..
653 There are a few relaxing opportunities available on the H8:
655 jmp/jsr:24 -> bra/bsr:8 2 bytes
656 The jmp may be completely eliminated if the previous insn is a
657 conditional branch to the insn after the jump. In that case
658 we invert the branch and delete the jump and save 4 bytes.
660 bCC:16 -> bCC:8 2 bytes
661 bsr:16 -> bsr:8 2 bytes
663 bset:16 -> bset:8 2 bytes
664 bset:24/32 -> bset:8 4 bytes
665 (also applicable to other bit manipulation instructions)
667 mov.b:16 -> mov.b:8 2 bytes
668 mov.b:24/32 -> mov.b:8 4 bytes
670 bset:24/32 -> bset:16 2 bytes
671 (also applicable to other bit manipulation instructions)
673 mov.[bwl]:24/32 -> mov.[bwl]:16 2 bytes */
676 elf32_h8_relax_section (bfd *abfd, asection *sec,
677 struct bfd_link_info *link_info, bfd_boolean *again)
679 Elf_Internal_Shdr *symtab_hdr;
680 Elf_Internal_Rela *internal_relocs;
681 Elf_Internal_Rela *irel, *irelend;
682 bfd_byte *contents = NULL;
683 Elf_Internal_Sym *isymbuf = NULL;
684 static asection *last_input_section = NULL;
685 static Elf_Internal_Rela *last_reloc = NULL;
687 /* Assume nothing changes. */
690 /* We don't have to do anything for a relocatable link, if
691 this section does not have relocs, or if this is not a
693 if (link_info->relocatable
694 || (sec->flags & SEC_RELOC) == 0
695 || sec->reloc_count == 0
696 || (sec->flags & SEC_CODE) == 0)
699 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
701 /* Get a copy of the native relocations. */
702 internal_relocs = (_bfd_elf_link_read_relocs
703 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
704 link_info->keep_memory));
705 if (internal_relocs == NULL)
708 if (sec != last_input_section)
711 last_input_section = sec;
713 /* Walk through the relocs looking for relaxing opportunities. */
714 irelend = internal_relocs + sec->reloc_count;
715 for (irel = internal_relocs; irel < irelend; irel++)
722 elf32_h8_info_to_howto (abfd, &bfd_reloc, irel);
724 /* Keep track of the previous reloc so that we can delete
725 some long jumps created by the compiler. */
726 if (irel != internal_relocs)
727 last_reloc = irel - 1;
729 if (ELF32_R_TYPE (irel->r_info) != R_H8_DIR24R8
730 && ELF32_R_TYPE (irel->r_info) != R_H8_PCREL16
731 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR16A8
732 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR24A8
733 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR32A16)
736 /* Get the section contents if we haven't done so already. */
737 if (contents == NULL)
739 /* Get cached copy if it exists. */
740 if (elf_section_data (sec)->this_hdr.contents != NULL)
741 contents = elf_section_data (sec)->this_hdr.contents;
744 /* Go get them off disk. */
745 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
750 /* Read this BFD's local symbols if we haven't done so already. */
751 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
753 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
755 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
756 symtab_hdr->sh_info, 0,
762 /* Get the value of the symbol referred to by the reloc. */
763 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
765 /* A local symbol. */
766 Elf_Internal_Sym *isym;
769 isym = isymbuf + ELF32_R_SYM (irel->r_info);
770 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
771 symval = isym->st_value;
772 /* If the reloc is absolute, it will not have
773 a symbol or section associated with it. */
775 symval += sym_sec->output_section->vma
776 + sym_sec->output_offset;
781 struct elf_link_hash_entry *h;
783 /* An external symbol. */
784 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
785 h = elf_sym_hashes (abfd)[indx];
786 BFD_ASSERT (h != NULL);
787 if (h->root.type != bfd_link_hash_defined
788 && h->root.type != bfd_link_hash_defweak)
790 /* This appears to be a reference to an undefined
791 symbol. Just ignore it--it will be caught by the
792 regular reloc processing. */
796 symval = (h->root.u.def.value
797 + h->root.u.def.section->output_section->vma
798 + h->root.u.def.section->output_offset);
801 /* For simplicity of coding, we are going to modify the section
802 contents, the section relocs, and the BFD symbol table. We
803 must tell the rest of the code not to free up this
804 information. It would be possible to instead create a table
805 of changes which have to be made, as is done in coff-mips.c;
806 that would be more work, but would require less memory when
807 the linker is run. */
808 switch (ELF32_R_TYPE (irel->r_info))
810 /* Try to turn a 24-bit absolute branch/call into an 8-bit
811 pc-relative branch/call. */
814 bfd_vma value = symval + irel->r_addend;
817 /* Get the address of this instruction. */
818 dot = (sec->output_section->vma
819 + sec->output_offset + irel->r_offset - 1);
821 /* Compute the distance from this insn to the branch target. */
824 /* If the distance is within -126..+130 inclusive, then we can
825 relax this jump. +130 is valid since the target will move
826 two bytes closer if we do relax this branch. */
827 if ((int) gap >= -126 && (int) gap <= 130)
831 /* Note that we've changed the relocs, section contents,
833 elf_section_data (sec)->relocs = internal_relocs;
834 elf_section_data (sec)->this_hdr.contents = contents;
835 symtab_hdr->contents = (unsigned char *) isymbuf;
837 /* Get the instruction code being relaxed. */
838 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
840 /* If the previous instruction conditionally jumped around
841 this instruction, we may be able to reverse the condition
842 and redirect the previous instruction to the target of
845 Such sequences are used by the compiler to deal with
846 long conditional branches.
848 Only perform this optimisation for jumps (code 0x5a) not
849 subroutine calls, as otherwise it could transform:
862 which changes the call (jsr) into a branch (bne). */
867 && ELF32_R_TYPE (last_reloc->r_info) == R_H8_PCREL8
868 && ELF32_R_SYM (last_reloc->r_info) < symtab_hdr->sh_info)
871 asection *last_sym_sec;
872 Elf_Internal_Sym *last_sym;
874 /* We will need to examine the symbol used by the
875 previous relocation. */
877 last_sym = isymbuf + ELF32_R_SYM (last_reloc->r_info);
879 = bfd_section_from_elf_index (abfd, last_sym->st_shndx);
880 last_value = (last_sym->st_value
881 + last_sym_sec->output_section->vma
882 + last_sym_sec->output_offset);
884 /* Verify that the previous relocation was for a
885 branch around this instruction and that no symbol
886 exists at the current location. */
887 if (last_value == dot + 4
888 && last_reloc->r_offset + 2 == irel->r_offset
889 && ! elf32_h8_symbol_address_p (abfd, sec, dot))
891 /* We can eliminate this jump. Twiddle the
892 previous relocation as necessary. */
894 = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
895 ELF32_R_TYPE (R_H8_NONE));
898 = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
899 ELF32_R_TYPE (R_H8_PCREL8));
900 last_reloc->r_addend = irel->r_addend;
902 code = bfd_get_8 (abfd,
903 contents + last_reloc->r_offset - 1);
907 contents + last_reloc->r_offset - 1);
909 /* Delete four bytes of data. */
910 if (!elf32_h8_relax_delete_bytes (abfd, sec,
922 bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 1);
923 else if (code == 0x5a)
925 bfd_put_8 (abfd, 0x40, contents + irel->r_offset - 1);
929 /* Fix the relocation's type. */
930 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
933 /* Delete two bytes of data. */
934 if (!elf32_h8_relax_delete_bytes (abfd, sec,
935 irel->r_offset + 1, 2))
938 /* That will change things, so, we should relax again.
939 Note that this is not required, and it may be slow. */
945 /* Try to turn a 16-bit pc-relative branch into a 8-bit pc-relative
949 bfd_vma value = symval + irel->r_addend;
953 /* Get the address of this instruction. */
954 dot = (sec->output_section->vma
956 + irel->r_offset - 2);
960 /* If the distance is within -126..+130 inclusive, then we can
961 relax this jump. +130 is valid since the target will move
962 two bytes closer if we do relax this branch. */
963 if ((int) gap >= -126 && (int) gap <= 130)
967 /* Note that we've changed the relocs, section contents,
969 elf_section_data (sec)->relocs = internal_relocs;
970 elf_section_data (sec)->this_hdr.contents = contents;
971 symtab_hdr->contents = (unsigned char *) isymbuf;
973 /* Get the opcode. */
974 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
978 /* bCC:16 -> bCC:8 */
979 /* Get the second byte of the original insn, which
980 contains the condition code. */
981 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
983 /* Compute the fisrt byte of the relaxed
984 instruction. The original sequence 0x58 0xX0
985 is relaxed to 0x4X, where X represents the
990 bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
992 else if (code == 0x5c)
994 bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 2);
996 /* Might be MOVSD. */
999 /* Fix the relocation's type. */
1000 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1004 /* Delete two bytes of data. */
1005 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1006 irel->r_offset + 1, 2))
1009 /* That will change things, so, we should relax again.
1010 Note that this is not required, and it may be slow. */
1016 /* This is a 16-bit absolute address in one of the following
1019 "band", "bclr", "biand", "bild", "bior", "bist", "bixor",
1020 "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
1023 We may relax this into an 8-bit absolute address if it's in
1029 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1030 if (value >= 0xffffff00u)
1033 unsigned char temp_code;
1035 /* Note that we've changed the relocs, section contents,
1037 elf_section_data (sec)->relocs = internal_relocs;
1038 elf_section_data (sec)->this_hdr.contents = contents;
1039 symtab_hdr->contents = (unsigned char *) isymbuf;
1041 /* Get the opcode. */
1042 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
1044 /* All instructions with R_H8_DIR16A8 start with
1049 temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1050 /* If this is a mov.b instruction, clear the lower
1051 nibble, which contains the source/destination
1053 if ((temp_code & 0x10) != 0x10)
1059 /* This is mov.b @aa:16,Rd. */
1060 bfd_put_8 (abfd, (code & 0xf) | 0x20,
1061 contents + irel->r_offset - 2);
1064 /* This is mov.b Rs,@aa:16. */
1065 bfd_put_8 (abfd, (code & 0xf) | 0x30,
1066 contents + irel->r_offset - 2);
1069 /* This is a bit-maniputation instruction that
1070 stores one bit into memory, one of "bclr",
1071 "bist", "bnot", "bset", and "bst". */
1072 bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
1075 /* This is a bit-maniputation instruction that
1076 loads one bit from memory, one of "band",
1077 "biand", "bild", "bior", "bixor", "bld", "bor",
1078 "btst", and "bxor". */
1079 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
1085 /* Fix the relocation's type. */
1086 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1089 /* Move the relocation. */
1092 /* Delete two bytes of data. */
1093 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1094 irel->r_offset + 1, 2))
1097 /* That will change things, so, we should relax again.
1098 Note that this is not required, and it may be slow. */
1104 /* This is a 24-bit absolute address in one of the following
1107 "band", "bclr", "biand", "bild", "bior", "bist", "bixor",
1108 "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
1111 We may relax this into an 8-bit absolute address if it's in
1117 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1118 if (value >= 0xffffff00u)
1121 unsigned char temp_code;
1123 /* Note that we've changed the relocs, section contents,
1125 elf_section_data (sec)->relocs = internal_relocs;
1126 elf_section_data (sec)->this_hdr.contents = contents;
1127 symtab_hdr->contents = (unsigned char *) isymbuf;
1129 /* Get the opcode. */
1130 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
1132 /* All instructions with R_H8_DIR24A8 start with
1137 temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1139 /* If this is a mov.b instruction, clear the lower
1140 nibble, which contains the source/destination
1142 if ((temp_code & 0x30) != 0x30)
1148 /* This is mov.b @aa:24/32,Rd. */
1149 bfd_put_8 (abfd, (code & 0xf) | 0x20,
1150 contents + irel->r_offset - 2);
1153 /* This is mov.b Rs,@aa:24/32. */
1154 bfd_put_8 (abfd, (code & 0xf) | 0x30,
1155 contents + irel->r_offset - 2);
1158 /* This is a bit-maniputation instruction that
1159 stores one bit into memory, one of "bclr",
1160 "bist", "bnot", "bset", and "bst". */
1161 bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
1164 /* This is a bit-maniputation instruction that
1165 loads one bit from memory, one of "band",
1166 "biand", "bild", "bior", "bixor", "bld", "bor",
1167 "btst", and "bxor". */
1168 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
1174 /* Fix the relocation's type. */
1175 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1179 /* Delete two bytes of data. */
1180 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1181 irel->r_offset + 1, 4))
1184 /* That will change things, so, we should relax again.
1185 Note that this is not required, and it may be slow. */
1193 /* This is a 24-/32-bit absolute address in one of the
1194 following instructions:
1196 "band", "bclr", "biand", "bild", "bior", "bist",
1197 "bixor", "bld", "bnot", "bor", "bset", "bst", "btst",
1198 "bxor", "ldc.w", "stc.w" and "mov.[bwl]"
1200 We may relax this into an 16-bit absolute address if it's
1201 in the right range. */
1206 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1207 if (value <= 0x7fff || value >= 0xffff8000u)
1210 unsigned char op0, op1, op2, op3;
1211 unsigned char *op_ptr;
1213 /* Note that we've changed the relocs, section contents,
1215 elf_section_data (sec)->relocs = internal_relocs;
1216 elf_section_data (sec)->this_hdr.contents = contents;
1217 symtab_hdr->contents = (unsigned char *) isymbuf;
1219 if (irel->r_offset >= 4)
1221 /* Check for 4-byte MOVA relaxation. */
1222 int second_reloc = 0;
1224 op_ptr = contents + irel->r_offset - 4;
1229 reloc_howto_type *h;
1230 bfd_vma last_reloc_size;
1232 elf32_h8_info_to_howto (abfd, &bfd_reloc, last_reloc);
1233 h = bfd_reloc.howto;
1234 last_reloc_size = 1 << h->size;
1235 if (last_reloc->r_offset + last_reloc_size
1238 op_ptr -= last_reloc_size;
1244 Elf_Internal_Rela *next_reloc = irel + 1;
1246 reloc_howto_type *h;
1247 bfd_vma next_reloc_size;
1249 elf32_h8_info_to_howto (abfd, &bfd_reloc, next_reloc);
1250 h = bfd_reloc.howto;
1251 next_reloc_size = 1 << h->size;
1252 if (next_reloc->r_offset + next_reloc_size
1255 op_ptr -= next_reloc_size;
1260 op0 = bfd_get_8 (abfd, op_ptr + 0);
1261 op1 = bfd_get_8 (abfd, op_ptr + 1);
1262 op2 = bfd_get_8 (abfd, op_ptr + 2);
1263 op3 = bfd_get_8 (abfd, op_ptr + 3);
1266 && (op1 & 0xdf) == 0x5f
1267 && (op2 & 0x40) == 0x40
1268 && (op3 & 0x80) == 0x80)
1270 if ((op2 & 0x08) == 0)
1276 bfd_put_8 (abfd, op3, op_ptr + 3);
1281 bfd_put_8 (abfd, op2, op_ptr + 2);
1283 goto r_h8_dir32a16_common;
1287 /* Now check for short version of MOVA. */
1288 op_ptr = contents + irel->r_offset - 2;
1289 op0 = bfd_get_8 (abfd, op_ptr + 0);
1290 op1 = bfd_get_8 (abfd, op_ptr + 1);
1293 && (op1 & 0x88) == 0x80)
1296 bfd_put_8 (abfd, op1, op_ptr + 1);
1297 goto r_h8_dir32a16_common;
1300 /* Get the opcode. */
1301 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1303 /* Fix the opcode. For all the instructions that
1304 belong to this relaxation, we simply need to turn
1305 off bit 0x20 in the previous byte. */
1308 bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
1310 r_h8_dir32a16_common:
1311 /* Fix the relocation's type. */
1312 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1315 /* Delete two bytes of data. */
1316 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1317 irel->r_offset + 1, 2))
1320 /* That will change things, so, we should relax again.
1321 Note that this is not required, and it may be slow. */
1333 && symtab_hdr->contents != (unsigned char *) isymbuf)
1335 if (! link_info->keep_memory)
1338 symtab_hdr->contents = (unsigned char *) isymbuf;
1341 if (contents != NULL
1342 && elf_section_data (sec)->this_hdr.contents != contents)
1344 if (! link_info->keep_memory)
1348 /* Cache the section contents for elf_link_input_bfd. */
1349 elf_section_data (sec)->this_hdr.contents = contents;
1353 if (internal_relocs != NULL
1354 && elf_section_data (sec)->relocs != internal_relocs)
1355 free (internal_relocs);
1361 && symtab_hdr->contents != (unsigned char *) isymbuf)
1363 if (contents != NULL
1364 && elf_section_data (sec)->this_hdr.contents != contents)
1366 if (internal_relocs != NULL
1367 && elf_section_data (sec)->relocs != internal_relocs)
1368 free (internal_relocs);
1372 /* Delete some bytes from a section while relaxing. */
1375 elf32_h8_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count)
1377 Elf_Internal_Shdr *symtab_hdr;
1378 unsigned int sec_shndx;
1380 Elf_Internal_Rela *irel, *irelend;
1381 Elf_Internal_Sym *isym;
1382 Elf_Internal_Sym *isymend;
1384 struct elf_link_hash_entry **sym_hashes;
1385 struct elf_link_hash_entry **end_hashes;
1386 unsigned int symcount;
1388 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1390 contents = elf_section_data (sec)->this_hdr.contents;
1394 irel = elf_section_data (sec)->relocs;
1395 irelend = irel + sec->reloc_count;
1397 /* Actually delete the bytes. */
1398 memmove (contents + addr, contents + addr + count,
1399 (size_t) (toaddr - addr - count));
1402 /* Adjust all the relocs. */
1403 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
1405 /* Get the new reloc address. */
1406 if ((irel->r_offset > addr
1407 && irel->r_offset < toaddr))
1408 irel->r_offset -= count;
1411 /* Adjust the local symbols defined in this section. */
1412 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1413 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
1414 isymend = isym + symtab_hdr->sh_info;
1415 for (; isym < isymend; isym++)
1417 if (isym->st_shndx == sec_shndx
1418 && isym->st_value > addr
1419 && isym->st_value < toaddr)
1420 isym->st_value -= count;
1423 /* Now adjust the global symbols defined in this section. */
1424 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1425 - symtab_hdr->sh_info);
1426 sym_hashes = elf_sym_hashes (abfd);
1427 end_hashes = sym_hashes + symcount;
1428 for (; sym_hashes < end_hashes; sym_hashes++)
1430 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1431 if ((sym_hash->root.type == bfd_link_hash_defined
1432 || sym_hash->root.type == bfd_link_hash_defweak)
1433 && sym_hash->root.u.def.section == sec
1434 && sym_hash->root.u.def.value > addr
1435 && sym_hash->root.u.def.value < toaddr)
1437 sym_hash->root.u.def.value -= count;
1444 /* Return TRUE if a symbol exists at the given address, else return
1447 elf32_h8_symbol_address_p (bfd *abfd, asection *sec, bfd_vma addr)
1449 Elf_Internal_Shdr *symtab_hdr;
1450 unsigned int sec_shndx;
1451 Elf_Internal_Sym *isym;
1452 Elf_Internal_Sym *isymend;
1453 struct elf_link_hash_entry **sym_hashes;
1454 struct elf_link_hash_entry **end_hashes;
1455 unsigned int symcount;
1457 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1459 /* Examine all the symbols. */
1460 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1461 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
1462 isymend = isym + symtab_hdr->sh_info;
1463 for (; isym < isymend; isym++)
1465 if (isym->st_shndx == sec_shndx
1466 && isym->st_value == addr)
1470 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1471 - symtab_hdr->sh_info);
1472 sym_hashes = elf_sym_hashes (abfd);
1473 end_hashes = sym_hashes + symcount;
1474 for (; sym_hashes < end_hashes; sym_hashes++)
1476 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1477 if ((sym_hash->root.type == bfd_link_hash_defined
1478 || sym_hash->root.type == bfd_link_hash_defweak)
1479 && sym_hash->root.u.def.section == sec
1480 && sym_hash->root.u.def.value == addr)
1487 /* This is a version of bfd_generic_get_relocated_section_contents
1488 which uses elf32_h8_relocate_section. */
1491 elf32_h8_get_relocated_section_contents (bfd *output_bfd,
1492 struct bfd_link_info *link_info,
1493 struct bfd_link_order *link_order,
1495 bfd_boolean relocatable,
1498 Elf_Internal_Shdr *symtab_hdr;
1499 asection *input_section = link_order->u.indirect.section;
1500 bfd *input_bfd = input_section->owner;
1501 asection **sections = NULL;
1502 Elf_Internal_Rela *internal_relocs = NULL;
1503 Elf_Internal_Sym *isymbuf = NULL;
1505 /* We only need to handle the case of relaxing, or of having a
1506 particular set of section contents, specially. */
1508 || elf_section_data (input_section)->this_hdr.contents == NULL)
1509 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
1514 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1516 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
1517 (size_t) input_section->size);
1519 if ((input_section->flags & SEC_RELOC) != 0
1520 && input_section->reloc_count > 0)
1523 Elf_Internal_Sym *isym, *isymend;
1526 internal_relocs = (_bfd_elf_link_read_relocs
1527 (input_bfd, input_section, NULL,
1528 (Elf_Internal_Rela *) NULL, FALSE));
1529 if (internal_relocs == NULL)
1532 if (symtab_hdr->sh_info != 0)
1534 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1535 if (isymbuf == NULL)
1536 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
1537 symtab_hdr->sh_info, 0,
1539 if (isymbuf == NULL)
1543 amt = symtab_hdr->sh_info;
1544 amt *= sizeof (asection *);
1545 sections = (asection **) bfd_malloc (amt);
1546 if (sections == NULL && amt != 0)
1549 isymend = isymbuf + symtab_hdr->sh_info;
1550 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
1554 if (isym->st_shndx == SHN_UNDEF)
1555 isec = bfd_und_section_ptr;
1556 else if (isym->st_shndx == SHN_ABS)
1557 isec = bfd_abs_section_ptr;
1558 else if (isym->st_shndx == SHN_COMMON)
1559 isec = bfd_com_section_ptr;
1561 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
1566 if (! elf32_h8_relocate_section (output_bfd, link_info, input_bfd,
1567 input_section, data, internal_relocs,
1571 if (sections != NULL)
1574 && symtab_hdr->contents != (unsigned char *) isymbuf)
1576 if (elf_section_data (input_section)->relocs != internal_relocs)
1577 free (internal_relocs);
1583 if (sections != NULL)
1586 && symtab_hdr->contents != (unsigned char *) isymbuf)
1588 if (internal_relocs != NULL
1589 && elf_section_data (input_section)->relocs != internal_relocs)
1590 free (internal_relocs);
1595 #define TARGET_BIG_SYM bfd_elf32_h8300_vec
1596 #define TARGET_BIG_NAME "elf32-h8300"
1597 #define ELF_ARCH bfd_arch_h8300
1598 #define ELF_MACHINE_CODE EM_H8_300
1599 #define ELF_MAXPAGESIZE 0x1
1600 #define bfd_elf32_bfd_reloc_type_lookup elf32_h8_reloc_type_lookup
1601 #define bfd_elf32_bfd_reloc_name_lookup elf32_h8_reloc_name_lookup
1602 #define elf_info_to_howto elf32_h8_info_to_howto
1603 #define elf_info_to_howto_rel elf32_h8_info_to_howto_rel
1605 /* So we can set/examine bits in e_flags to get the specific
1606 H8 architecture in use. */
1607 #define elf_backend_final_write_processing \
1608 elf32_h8_final_write_processing
1609 #define elf_backend_object_p \
1611 #define bfd_elf32_bfd_merge_private_bfd_data \
1612 elf32_h8_merge_private_bfd_data
1614 /* ??? when elf_backend_relocate_section is not defined, elf32-target.h
1615 defaults to using _bfd_generic_link_hash_table_create, but
1616 bfd_elf_size_dynamic_sections uses
1617 dynobj = elf_hash_table (info)->dynobj;
1618 and thus requires an elf hash table. */
1619 #define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create
1621 /* Use an H8 specific linker, not the ELF generic linker. */
1622 #define elf_backend_relocate_section elf32_h8_relocate_section
1623 #define elf_backend_rela_normal 1
1624 #define elf_backend_can_gc_sections 1
1626 /* And relaxing stuff. */
1627 #define bfd_elf32_bfd_relax_section elf32_h8_relax_section
1628 #define bfd_elf32_bfd_get_relocated_section_contents \
1629 elf32_h8_get_relocated_section_contents
1631 #define elf_symbol_leading_char '_'
1633 #include "elf32-target.h"