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 (info, input_bfd, input_section, rel,
445 r_symndx, symtab_hdr, sym_hashes,
447 unresolved_reloc, warned);
450 r = elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd,
452 contents, rel->r_offset,
453 relocation, rel->r_addend,
454 info, sec, h == NULL);
456 if (r != bfd_reloc_ok)
459 const char *msg = (const char *) 0;
461 reloc_howto_type *howto;
463 elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel);
464 howto = bfd_reloc.howto;
467 name = h->root.root.string;
470 name = (bfd_elf_string_from_elf_section
471 (input_bfd, symtab_hdr->sh_link, sym->st_name));
472 if (name == NULL || *name == '\0')
473 name = bfd_section_name (input_bfd, sec);
478 case bfd_reloc_overflow:
479 if (! ((*info->callbacks->reloc_overflow)
480 (info, name, howto->name, (bfd_vma) 0,
481 input_bfd, input_section, rel->r_offset)))
485 case bfd_reloc_undefined:
486 if (! ((*info->callbacks->undefined_symbol)
487 (info, name, input_bfd, input_section,
488 rel->r_offset, TRUE)))
492 case bfd_reloc_outofrange:
493 msg = _("internal error: out of range error");
496 case bfd_reloc_notsupported:
497 msg = _("internal error: unsupported relocation error");
500 case bfd_reloc_dangerous:
501 msg = _("internal error: dangerous error");
505 msg = _("internal error: unknown error");
509 if (!((*info->callbacks->warning)
510 (info, msg, name, input_bfd, input_section,
521 /* Object files encode the specific H8 model they were compiled
522 for in the ELF flags field.
524 Examine that field and return the proper BFD machine type for
527 elf32_h8_mach (flagword flags)
529 switch (flags & EF_H8_MACH)
531 case E_H8_MACH_H8300:
533 return bfd_mach_h8300;
535 case E_H8_MACH_H8300H:
536 return bfd_mach_h8300h;
538 case E_H8_MACH_H8300S:
539 return bfd_mach_h8300s;
541 case E_H8_MACH_H8300HN:
542 return bfd_mach_h8300hn;
544 case E_H8_MACH_H8300SN:
545 return bfd_mach_h8300sn;
547 case E_H8_MACH_H8300SX:
548 return bfd_mach_h8300sx;
550 case E_H8_MACH_H8300SXN:
551 return bfd_mach_h8300sxn;
555 /* The final processing done just before writing out a H8 ELF object
556 file. We use this opportunity to encode the BFD machine type
557 into the flags field in the object file. */
560 elf32_h8_final_write_processing (bfd *abfd,
561 bfd_boolean linker ATTRIBUTE_UNUSED)
565 switch (bfd_get_mach (abfd))
569 val = E_H8_MACH_H8300;
572 case bfd_mach_h8300h:
573 val = E_H8_MACH_H8300H;
576 case bfd_mach_h8300s:
577 val = E_H8_MACH_H8300S;
580 case bfd_mach_h8300hn:
581 val = E_H8_MACH_H8300HN;
584 case bfd_mach_h8300sn:
585 val = E_H8_MACH_H8300SN;
588 case bfd_mach_h8300sx:
589 val = E_H8_MACH_H8300SX;
592 case bfd_mach_h8300sxn:
593 val = E_H8_MACH_H8300SXN;
597 elf_elfheader (abfd)->e_flags &= ~ (EF_H8_MACH);
598 elf_elfheader (abfd)->e_flags |= val;
601 /* Return nonzero if ABFD represents a valid H8 ELF object file; also
602 record the encoded machine type found in the ELF flags. */
605 elf32_h8_object_p (bfd *abfd)
607 bfd_default_set_arch_mach (abfd, bfd_arch_h8300,
608 elf32_h8_mach (elf_elfheader (abfd)->e_flags));
612 /* Merge backend specific data from an object file to the output
613 object file when linking. The only data we need to copy at this
614 time is the architecture/machine information. */
617 elf32_h8_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
619 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
620 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
623 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
624 && bfd_get_mach (obfd) < bfd_get_mach (ibfd))
626 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
627 bfd_get_mach (ibfd)))
634 /* This function handles relaxing for the H8..
636 There are a few relaxing opportunities available on the H8:
638 jmp/jsr:24 -> bra/bsr:8 2 bytes
639 The jmp may be completely eliminated if the previous insn is a
640 conditional branch to the insn after the jump. In that case
641 we invert the branch and delete the jump and save 4 bytes.
643 bCC:16 -> bCC:8 2 bytes
644 bsr:16 -> bsr:8 2 bytes
646 bset:16 -> bset:8 2 bytes
647 bset:24/32 -> bset:8 4 bytes
648 (also applicable to other bit manipulation instructions)
650 mov.b:16 -> mov.b:8 2 bytes
651 mov.b:24/32 -> mov.b:8 4 bytes
653 bset:24/32 -> bset:16 2 bytes
654 (also applicable to other bit manipulation instructions)
656 mov.[bwl]:24/32 -> mov.[bwl]:16 2 bytes */
659 elf32_h8_relax_section (bfd *abfd, asection *sec,
660 struct bfd_link_info *link_info, bfd_boolean *again)
662 Elf_Internal_Shdr *symtab_hdr;
663 Elf_Internal_Rela *internal_relocs;
664 Elf_Internal_Rela *irel, *irelend;
665 bfd_byte *contents = NULL;
666 Elf_Internal_Sym *isymbuf = NULL;
667 static asection *last_input_section = NULL;
668 static Elf_Internal_Rela *last_reloc = NULL;
670 /* Assume nothing changes. */
673 /* We don't have to do anything for a relocatable link, if
674 this section does not have relocs, or if this is not a
676 if (link_info->relocatable
677 || (sec->flags & SEC_RELOC) == 0
678 || sec->reloc_count == 0
679 || (sec->flags & SEC_CODE) == 0)
682 /* If this is the first time we have been called for this section,
683 initialize the cooked size. */
684 if (sec->_cooked_size == 0)
685 sec->_cooked_size = sec->_raw_size;
687 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
689 /* Get a copy of the native relocations. */
690 internal_relocs = (_bfd_elf_link_read_relocs
691 (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
692 link_info->keep_memory));
693 if (internal_relocs == NULL)
696 if (sec != last_input_section)
699 last_input_section = sec;
701 /* Walk through the relocs looking for relaxing opportunities. */
702 irelend = internal_relocs + sec->reloc_count;
703 for (irel = internal_relocs; irel < irelend; irel++)
707 /* Keep track of the previous reloc so that we can delete
708 some long jumps created by the compiler. */
709 if (irel != internal_relocs)
710 last_reloc = irel - 1;
712 if (ELF32_R_TYPE (irel->r_info) != R_H8_DIR24R8
713 && ELF32_R_TYPE (irel->r_info) != R_H8_PCREL16
714 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR16A8
715 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR24A8
716 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR32A16)
719 /* Get the section contents if we haven't done so already. */
720 if (contents == NULL)
722 /* Get cached copy if it exists. */
723 if (elf_section_data (sec)->this_hdr.contents != NULL)
724 contents = elf_section_data (sec)->this_hdr.contents;
727 /* Go get them off disk. */
728 contents = (bfd_byte *) bfd_malloc (sec->_raw_size);
729 if (contents == NULL)
732 if (! bfd_get_section_contents (abfd, sec, contents,
733 (file_ptr) 0, sec->_raw_size))
738 /* Read this BFD's local symbols if we haven't done so already. */
739 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
741 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
743 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
744 symtab_hdr->sh_info, 0,
750 /* Get the value of the symbol referred to by the reloc. */
751 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
753 /* A local symbol. */
754 Elf_Internal_Sym *isym;
757 isym = isymbuf + ELF32_R_SYM (irel->r_info);
758 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
759 symval = isym->st_value;
760 /* If the reloc is absolute, it will not have
761 a symbol or section associated with it. */
763 symval += sym_sec->output_section->vma
764 + sym_sec->output_offset;
769 struct elf_link_hash_entry *h;
771 /* An external symbol. */
772 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
773 h = elf_sym_hashes (abfd)[indx];
774 BFD_ASSERT (h != NULL);
775 if (h->root.type != bfd_link_hash_defined
776 && h->root.type != bfd_link_hash_defweak)
778 /* This appears to be a reference to an undefined
779 symbol. Just ignore it--it will be caught by the
780 regular reloc processing. */
784 symval = (h->root.u.def.value
785 + h->root.u.def.section->output_section->vma
786 + h->root.u.def.section->output_offset);
789 /* For simplicity of coding, we are going to modify the section
790 contents, the section relocs, and the BFD symbol table. We
791 must tell the rest of the code not to free up this
792 information. It would be possible to instead create a table
793 of changes which have to be made, as is done in coff-mips.c;
794 that would be more work, but would require less memory when
795 the linker is run. */
796 switch (ELF32_R_TYPE (irel->r_info))
798 /* Try to turn a 24-bit absolute branch/call into an 8-bit
799 pc-relative branch/call. */
802 bfd_vma value = symval + irel->r_addend;
805 /* Get the address of this instruction. */
806 dot = (sec->output_section->vma
807 + sec->output_offset + irel->r_offset - 1);
809 /* Compute the distance from this insn to the branch target. */
812 /* If the distance is within -126..+130 inclusive, then we can
813 relax this jump. +130 is valid since the target will move
814 two bytes closer if we do relax this branch. */
815 if ((int) gap >= -126 && (int) gap <= 130)
819 /* Note that we've changed the relocs, section contents,
821 elf_section_data (sec)->relocs = internal_relocs;
822 elf_section_data (sec)->this_hdr.contents = contents;
823 symtab_hdr->contents = (unsigned char *) isymbuf;
825 /* Get the instruction code being relaxed. */
826 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
828 /* If the previous instruction conditionally jumped around
829 this instruction, we may be able to reverse the condition
830 and redirect the previous instruction to the target of
833 Such sequences are used by the compiler to deal with
834 long conditional branches.
836 Only perform this optimisation for jumps (code 0x5a) not
837 subroutine calls, as otherwise it could transform:
850 which changes the call (jsr) into a branch (bne). */
855 && ELF32_R_TYPE (last_reloc->r_info) == R_H8_PCREL8
856 && ELF32_R_SYM (last_reloc->r_info) < symtab_hdr->sh_info)
859 asection *last_sym_sec;
860 Elf_Internal_Sym *last_sym;
862 /* We will need to examine the symbol used by the
863 previous relocation. */
865 last_sym = isymbuf + ELF32_R_SYM (last_reloc->r_info);
867 = bfd_section_from_elf_index (abfd, last_sym->st_shndx);
868 last_value = (last_sym->st_value
869 + last_sym_sec->output_section->vma
870 + last_sym_sec->output_offset);
872 /* Verify that the previous relocation was for a
873 branch around this instruction and that no symbol
874 exists at the current location. */
875 if (last_value == dot + 4
876 && last_reloc->r_offset + 2 == irel->r_offset
877 && ! elf32_h8_symbol_address_p (abfd, sec, dot))
879 /* We can eliminate this jump. Twiddle the
880 previous relocation as necessary. */
882 = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
883 ELF32_R_TYPE (R_H8_NONE));
886 = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
887 ELF32_R_TYPE (R_H8_PCREL8));
888 last_reloc->r_addend = irel->r_addend;
890 code = bfd_get_8 (abfd,
891 contents + last_reloc->r_offset - 1);
895 contents + last_reloc->r_offset - 1);
897 /* Delete four bytes of data. */
898 if (!elf32_h8_relax_delete_bytes (abfd, sec,
910 bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 1);
911 else if (code == 0x5a)
913 bfd_put_8 (abfd, 0x40, contents + irel->r_offset - 1);
917 /* Fix the relocation's type. */
918 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
921 /* Delete two bytes of data. */
922 if (!elf32_h8_relax_delete_bytes (abfd, sec,
923 irel->r_offset + 1, 2))
926 /* That will change things, so, we should relax again.
927 Note that this is not required, and it may be slow. */
933 /* Try to turn a 16-bit pc-relative branch into a 8-bit pc-relative
937 bfd_vma value = symval + irel->r_addend;
941 /* Get the address of this instruction. */
942 dot = (sec->output_section->vma
944 + irel->r_offset - 2);
948 /* If the distance is within -126..+130 inclusive, then we can
949 relax this jump. +130 is valid since the target will move
950 two bytes closer if we do relax this branch. */
951 if ((int) gap >= -126 && (int) gap <= 130)
955 /* Note that we've changed the relocs, section contents,
957 elf_section_data (sec)->relocs = internal_relocs;
958 elf_section_data (sec)->this_hdr.contents = contents;
959 symtab_hdr->contents = (unsigned char *) isymbuf;
961 /* Get the opcode. */
962 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
966 /* bCC:16 -> bCC:8 */
967 /* Get the second byte of the original insn, which
968 contains the condition code. */
969 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
971 /* Compute the fisrt byte of the relaxed
972 instruction. The original sequence 0x58 0xX0
973 is relaxed to 0x4X, where X represents the
978 bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
980 else if (code == 0x5c)
982 bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 2);
986 /* Fix the relocation's type. */
987 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
991 /* Delete two bytes of data. */
992 if (!elf32_h8_relax_delete_bytes (abfd, sec,
993 irel->r_offset + 1, 2))
996 /* That will change things, so, we should relax again.
997 Note that this is not required, and it may be slow. */
1003 /* This is a 16-bit absolute address in one of the following
1006 "band", "bclr", "biand", "bild", "bior", "bist", "bixor",
1007 "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
1010 We may relax this into an 8-bit absolute address if it's in
1016 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1017 if (value >= 0xffffff00u)
1020 unsigned char temp_code;
1022 /* Note that we've changed the relocs, section contents,
1024 elf_section_data (sec)->relocs = internal_relocs;
1025 elf_section_data (sec)->this_hdr.contents = contents;
1026 symtab_hdr->contents = (unsigned char *) isymbuf;
1028 /* Get the opcode. */
1029 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
1031 /* All instructions with R_H8_DIR16A8 start with
1036 temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1037 /* If this is a mov.b instruction, clear the lower
1038 nibble, which contains the source/destination
1040 if ((temp_code & 0x10) != 0x10)
1046 /* This is mov.b @aa:16,Rd. */
1047 bfd_put_8 (abfd, (code & 0xf) | 0x20,
1048 contents + irel->r_offset - 2);
1051 /* This is mov.b Rs,@aa:16. */
1052 bfd_put_8 (abfd, (code & 0xf) | 0x30,
1053 contents + irel->r_offset - 2);
1056 /* This is a bit-maniputation instruction that
1057 stores one bit into memory, one of "bclr",
1058 "bist", "bnot", "bset", and "bst". */
1059 bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
1062 /* This is a bit-maniputation instruction that
1063 loads one bit from memory, one of "band",
1064 "biand", "bild", "bior", "bixor", "bld", "bor",
1065 "btst", and "bxor". */
1066 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
1072 /* Fix the relocation's type. */
1073 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1076 /* Move the relocation. */
1079 /* Delete two bytes of data. */
1080 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1081 irel->r_offset + 1, 2))
1084 /* That will change things, so, we should relax again.
1085 Note that this is not required, and it may be slow. */
1091 /* This is a 24-bit absolute address in one of the following
1094 "band", "bclr", "biand", "bild", "bior", "bist", "bixor",
1095 "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
1098 We may relax this into an 8-bit absolute address if it's in
1104 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1105 if (value >= 0xffffff00u)
1108 unsigned char temp_code;
1110 /* Note that we've changed the relocs, section contents,
1112 elf_section_data (sec)->relocs = internal_relocs;
1113 elf_section_data (sec)->this_hdr.contents = contents;
1114 symtab_hdr->contents = (unsigned char *) isymbuf;
1116 /* Get the opcode. */
1117 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
1119 /* All instructions with R_H8_DIR24A8 start with
1124 temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1126 /* If this is a mov.b instruction, clear the lower
1127 nibble, which contains the source/destination
1129 if ((temp_code & 0x30) != 0x30)
1135 /* This is mov.b @aa:24/32,Rd. */
1136 bfd_put_8 (abfd, (code & 0xf) | 0x20,
1137 contents + irel->r_offset - 2);
1140 /* This is mov.b Rs,@aa:24/32. */
1141 bfd_put_8 (abfd, (code & 0xf) | 0x30,
1142 contents + irel->r_offset - 2);
1145 /* This is a bit-maniputation instruction that
1146 stores one bit into memory, one of "bclr",
1147 "bist", "bnot", "bset", and "bst". */
1148 bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
1151 /* This is a bit-maniputation instruction that
1152 loads one bit from memory, one of "band",
1153 "biand", "bild", "bior", "bixor", "bld", "bor",
1154 "btst", and "bxor". */
1155 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
1161 /* Fix the relocation's type. */
1162 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1166 /* Delete two bytes of data. */
1167 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1168 irel->r_offset + 1, 4))
1171 /* That will change things, so, we should relax again.
1172 Note that this is not required, and it may be slow. */
1180 /* This is a 24-/32-bit absolute address in one of the
1181 following instructions:
1183 "band", "bclr", "biand", "bild", "bior", "bist",
1184 "bixor", "bld", "bnot", "bor", "bset", "bst", "btst",
1185 "bxor", "ldc.w", "stc.w" and "mov.[bwl]"
1187 We may relax this into an 16-bit absolute address if it's
1188 in the right range. */
1193 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1194 if (value <= 0x7fff || value >= 0xffff8000u)
1198 /* Note that we've changed the relocs, section contents,
1200 elf_section_data (sec)->relocs = internal_relocs;
1201 elf_section_data (sec)->this_hdr.contents = contents;
1202 symtab_hdr->contents = (unsigned char *) isymbuf;
1204 /* Get the opcode. */
1205 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1207 /* Fix the opcode. For all the instructions that
1208 belong to this relaxation, we simply need to turn
1209 off bit 0x20 in the previous byte. */
1212 bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
1214 /* Fix the relocation's type. */
1215 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1218 /* Delete two bytes of data. */
1219 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1220 irel->r_offset + 1, 2))
1223 /* That will change things, so, we should relax again.
1224 Note that this is not required, and it may be slow. */
1236 && symtab_hdr->contents != (unsigned char *) isymbuf)
1238 if (! link_info->keep_memory)
1241 symtab_hdr->contents = (unsigned char *) isymbuf;
1244 if (contents != NULL
1245 && elf_section_data (sec)->this_hdr.contents != contents)
1247 if (! link_info->keep_memory)
1251 /* Cache the section contents for elf_link_input_bfd. */
1252 elf_section_data (sec)->this_hdr.contents = contents;
1256 if (internal_relocs != NULL
1257 && elf_section_data (sec)->relocs != internal_relocs)
1258 free (internal_relocs);
1264 && symtab_hdr->contents != (unsigned char *) isymbuf)
1266 if (contents != NULL
1267 && elf_section_data (sec)->this_hdr.contents != contents)
1269 if (internal_relocs != NULL
1270 && elf_section_data (sec)->relocs != internal_relocs)
1271 free (internal_relocs);
1275 /* Delete some bytes from a section while relaxing. */
1278 elf32_h8_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count)
1280 Elf_Internal_Shdr *symtab_hdr;
1281 unsigned int sec_shndx;
1283 Elf_Internal_Rela *irel, *irelend;
1284 Elf_Internal_Rela *irelalign;
1285 Elf_Internal_Sym *isym;
1286 Elf_Internal_Sym *isymend;
1288 struct elf_link_hash_entry **sym_hashes;
1289 struct elf_link_hash_entry **end_hashes;
1290 unsigned int symcount;
1292 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1294 contents = elf_section_data (sec)->this_hdr.contents;
1296 /* The deletion must stop at the next ALIGN reloc for an aligment
1297 power larger than the number of bytes we are deleting. */
1300 toaddr = sec->_cooked_size;
1302 irel = elf_section_data (sec)->relocs;
1303 irelend = irel + sec->reloc_count;
1305 /* Actually delete the bytes. */
1306 memmove (contents + addr, contents + addr + count,
1307 (size_t) (toaddr - addr - count));
1308 sec->_cooked_size -= count;
1310 /* Adjust all the relocs. */
1311 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
1313 /* Get the new reloc address. */
1314 if ((irel->r_offset > addr
1315 && irel->r_offset < toaddr))
1316 irel->r_offset -= count;
1319 /* Adjust the local symbols defined in this section. */
1320 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1321 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
1322 isymend = isym + symtab_hdr->sh_info;
1323 for (; isym < isymend; isym++)
1325 if (isym->st_shndx == sec_shndx
1326 && isym->st_value > addr
1327 && isym->st_value < toaddr)
1328 isym->st_value -= count;
1331 /* Now adjust the global symbols defined in this section. */
1332 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1333 - symtab_hdr->sh_info);
1334 sym_hashes = elf_sym_hashes (abfd);
1335 end_hashes = sym_hashes + symcount;
1336 for (; sym_hashes < end_hashes; sym_hashes++)
1338 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1339 if ((sym_hash->root.type == bfd_link_hash_defined
1340 || sym_hash->root.type == bfd_link_hash_defweak)
1341 && sym_hash->root.u.def.section == sec
1342 && sym_hash->root.u.def.value > addr
1343 && sym_hash->root.u.def.value < toaddr)
1345 sym_hash->root.u.def.value -= count;
1352 /* Return TRUE if a symbol exists at the given address, else return
1355 elf32_h8_symbol_address_p (bfd *abfd, asection *sec, bfd_vma addr)
1357 Elf_Internal_Shdr *symtab_hdr;
1358 unsigned int sec_shndx;
1359 Elf_Internal_Sym *isym;
1360 Elf_Internal_Sym *isymend;
1361 struct elf_link_hash_entry **sym_hashes;
1362 struct elf_link_hash_entry **end_hashes;
1363 unsigned int symcount;
1365 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1367 /* Examine all the symbols. */
1368 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1369 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
1370 isymend = isym + symtab_hdr->sh_info;
1371 for (; isym < isymend; isym++)
1373 if (isym->st_shndx == sec_shndx
1374 && isym->st_value == addr)
1378 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1379 - symtab_hdr->sh_info);
1380 sym_hashes = elf_sym_hashes (abfd);
1381 end_hashes = sym_hashes + symcount;
1382 for (; sym_hashes < end_hashes; sym_hashes++)
1384 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1385 if ((sym_hash->root.type == bfd_link_hash_defined
1386 || sym_hash->root.type == bfd_link_hash_defweak)
1387 && sym_hash->root.u.def.section == sec
1388 && sym_hash->root.u.def.value == addr)
1395 /* This is a version of bfd_generic_get_relocated_section_contents
1396 which uses elf32_h8_relocate_section. */
1399 elf32_h8_get_relocated_section_contents (bfd *output_bfd,
1400 struct bfd_link_info *link_info,
1401 struct bfd_link_order *link_order,
1403 bfd_boolean relocatable,
1406 Elf_Internal_Shdr *symtab_hdr;
1407 asection *input_section = link_order->u.indirect.section;
1408 bfd *input_bfd = input_section->owner;
1409 asection **sections = NULL;
1410 Elf_Internal_Rela *internal_relocs = NULL;
1411 Elf_Internal_Sym *isymbuf = NULL;
1413 /* We only need to handle the case of relaxing, or of having a
1414 particular set of section contents, specially. */
1416 || elf_section_data (input_section)->this_hdr.contents == NULL)
1417 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
1422 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1424 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
1425 (size_t) input_section->_raw_size);
1427 if ((input_section->flags & SEC_RELOC) != 0
1428 && input_section->reloc_count > 0)
1431 Elf_Internal_Sym *isym, *isymend;
1434 internal_relocs = (_bfd_elf_link_read_relocs
1435 (input_bfd, input_section, (PTR) NULL,
1436 (Elf_Internal_Rela *) NULL, FALSE));
1437 if (internal_relocs == NULL)
1440 if (symtab_hdr->sh_info != 0)
1442 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1443 if (isymbuf == NULL)
1444 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
1445 symtab_hdr->sh_info, 0,
1447 if (isymbuf == NULL)
1451 amt = symtab_hdr->sh_info;
1452 amt *= sizeof (asection *);
1453 sections = (asection **) bfd_malloc (amt);
1454 if (sections == NULL && amt != 0)
1457 isymend = isymbuf + symtab_hdr->sh_info;
1458 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
1462 if (isym->st_shndx == SHN_UNDEF)
1463 isec = bfd_und_section_ptr;
1464 else if (isym->st_shndx == SHN_ABS)
1465 isec = bfd_abs_section_ptr;
1466 else if (isym->st_shndx == SHN_COMMON)
1467 isec = bfd_com_section_ptr;
1469 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
1474 if (! elf32_h8_relocate_section (output_bfd, link_info, input_bfd,
1475 input_section, data, internal_relocs,
1479 if (sections != NULL)
1482 && symtab_hdr->contents != (unsigned char *) isymbuf)
1484 if (elf_section_data (input_section)->relocs != internal_relocs)
1485 free (internal_relocs);
1491 if (sections != NULL)
1494 && symtab_hdr->contents != (unsigned char *) isymbuf)
1496 if (internal_relocs != NULL
1497 && elf_section_data (input_section)->relocs != internal_relocs)
1498 free (internal_relocs);
1503 elf32_h8_gc_mark_hook (asection *sec,
1504 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1505 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
1506 struct elf_link_hash_entry *h,
1507 Elf_Internal_Sym *sym)
1511 switch (h->root.type)
1513 case bfd_link_hash_defined:
1514 case bfd_link_hash_defweak:
1515 return h->root.u.def.section;
1517 case bfd_link_hash_common:
1518 return h->root.u.c.p->section;
1525 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1530 elf32_h8_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED,
1531 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1532 asection *sec ATTRIBUTE_UNUSED,
1533 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED)
1539 #define TARGET_BIG_SYM bfd_elf32_h8300_vec
1540 #define TARGET_BIG_NAME "elf32-h8300"
1541 #define ELF_ARCH bfd_arch_h8300
1542 #define ELF_MACHINE_CODE EM_H8_300
1543 #define ELF_MAXPAGESIZE 0x1
1544 #define bfd_elf32_bfd_reloc_type_lookup elf32_h8_reloc_type_lookup
1545 #define elf_info_to_howto elf32_h8_info_to_howto
1546 #define elf_info_to_howto_rel elf32_h8_info_to_howto_rel
1548 /* So we can set/examine bits in e_flags to get the specific
1549 H8 architecture in use. */
1550 #define elf_backend_final_write_processing \
1551 elf32_h8_final_write_processing
1552 #define elf_backend_object_p \
1554 #define bfd_elf32_bfd_merge_private_bfd_data \
1555 elf32_h8_merge_private_bfd_data
1556 #define elf_backend_gc_mark_hook elf32_h8_gc_mark_hook
1557 #define elf_backend_gc_sweep_hook elf32_h8_gc_sweep_hook
1559 /* ??? when elf_backend_relocate_section is not defined, elf32-target.h
1560 defaults to using _bfd_generic_link_hash_table_create, but
1561 elflink.h:bfd_elf32_size_dynamic_sections uses
1562 dynobj = elf_hash_table (info)->dynobj;
1563 and thus requires an elf hash table. */
1564 #define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create
1566 /* Use an H8 specific linker, not the ELF generic linker. */
1567 #define elf_backend_relocate_section elf32_h8_relocate_section
1568 #define elf_backend_rela_normal 1
1569 #define elf_backend_can_gc_sections 1
1571 /* And relaxing stuff. */
1572 #define bfd_elf32_bfd_relax_section elf32_h8_relax_section
1573 #define bfd_elf32_bfd_get_relocated_section_contents \
1574 elf32_h8_get_relocated_section_contents
1577 #include "elf32-target.h"