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2009-06-18 Dave Korn <dave.korn.cygwin@gmail.com>
[binutils.git] / bfd / elf32-h8300.c
blobea54112a11e85e9f7083e1e440f8f659617a2eb0
1 /* BFD back-end for Renesas H8/300 ELF binaries.
2 Copyright 1993, 1995, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
3 2007 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
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.
11
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.
16
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. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/h8.h"
27
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 *, PTR, asection *, bfd *, char **);
56
57 /* This does not include any relocation information, but should be
58 good enough for GDB or objdump to read the file. */
59
60 static reloc_howto_type h8_elf_howto_table[] = {
61 #define R_H8_NONE_X 0
62 HOWTO (R_H8_NONE, /* type */
63 0, /* rightshift */
64 0, /* size (0 = byte, 1 = short, 2 = long) */
65 0, /* bitsize */
66 FALSE, /* pc_relative */
67 0, /* bitpos */
68 complain_overflow_dont,/* complain_on_overflow */
69 special, /* special_function */
70 "R_H8_NONE", /* name */
71 FALSE, /* partial_inplace */
72 0, /* src_mask */
73 0, /* dst_mask */
74 FALSE), /* pcrel_offset */
75 #define R_H8_DIR32_X (R_H8_NONE_X + 1)
76 HOWTO (R_H8_DIR32, /* type */
77 0, /* rightshift */
78 2, /* size (0 = byte, 1 = short, 2 = long) */
79 32, /* bitsize */
80 FALSE, /* pc_relative */
81 0, /* bitpos */
82 complain_overflow_dont,/* complain_on_overflow */
83 special, /* special_function */
84 "R_H8_DIR32", /* name */
85 FALSE, /* partial_inplace */
86 0, /* src_mask */
87 0xffffffff, /* dst_mask */
88 FALSE), /* pcrel_offset */
89 #define R_H8_DIR16_X (R_H8_DIR32_X + 1)
90 HOWTO (R_H8_DIR16, /* type */
91 0, /* rightshift */
92 1, /* size (0 = byte, 1 = short, 2 = long) */
93 16, /* bitsize */
94 FALSE, /* pc_relative */
95 0, /* bitpos */
96 complain_overflow_dont,/* complain_on_overflow */
97 special, /* special_function */
98 "R_H8_DIR16", /* name */
99 FALSE, /* partial_inplace */
100 0, /* src_mask */
101 0x0000ffff, /* dst_mask */
102 FALSE), /* pcrel_offset */
103 #define R_H8_DIR8_X (R_H8_DIR16_X + 1)
104 HOWTO (R_H8_DIR8, /* type */
105 0, /* rightshift */
106 0, /* size (0 = byte, 1 = short, 2 = long) */
107 8, /* bitsize */
108 FALSE, /* pc_relative */
109 0, /* bitpos */
110 complain_overflow_dont,/* complain_on_overflow */
111 special, /* special_function */
112 "R_H8_DIR8", /* name */
113 FALSE, /* partial_inplace */
114 0, /* src_mask */
115 0x000000ff, /* dst_mask */
116 FALSE), /* pcrel_offset */
117 #define R_H8_DIR16A8_X (R_H8_DIR8_X + 1)
118 HOWTO (R_H8_DIR16A8, /* type */
119 0, /* rightshift */
120 1, /* size (0 = byte, 1 = short, 2 = long) */
121 16, /* bitsize */
122 FALSE, /* pc_relative */
123 0, /* bitpos */
124 complain_overflow_bitfield, /* complain_on_overflow */
125 special, /* special_function */
126 "R_H8_DIR16A8", /* name */
127 FALSE, /* partial_inplace */
128 0, /* src_mask */
129 0x0000ffff, /* dst_mask */
130 FALSE), /* pcrel_offset */
131 #define R_H8_DIR16R8_X (R_H8_DIR16A8_X + 1)
132 HOWTO (R_H8_DIR16R8, /* type */
133 0, /* rightshift */
134 1, /* size (0 = byte, 1 = short, 2 = long) */
135 16, /* bitsize */
136 FALSE, /* pc_relative */
137 0, /* bitpos */
138 complain_overflow_bitfield, /* complain_on_overflow */
139 special, /* special_function */
140 "R_H8_DIR16R8", /* name */
141 FALSE, /* partial_inplace */
142 0, /* src_mask */
143 0x0000ffff, /* dst_mask */
144 FALSE), /* pcrel_offset */
145 #define R_H8_DIR24A8_X (R_H8_DIR16R8_X + 1)
146 HOWTO (R_H8_DIR24A8, /* type */
147 0, /* rightshift */
148 2, /* size (0 = byte, 1 = short, 2 = long) */
149 24, /* bitsize */
150 FALSE, /* pc_relative */
151 0, /* bitpos */
152 complain_overflow_bitfield, /* complain_on_overflow */
153 special, /* special_function */
154 "R_H8_DIR24A8", /* name */
155 TRUE, /* partial_inplace */
156 0xff000000, /* src_mask */
157 0x00ffffff, /* dst_mask */
158 FALSE), /* pcrel_offset */
159 #define R_H8_DIR24R8_X (R_H8_DIR24A8_X + 1)
160 HOWTO (R_H8_DIR24R8, /* type */
161 0, /* rightshift */
162 2, /* size (0 = byte, 1 = short, 2 = long) */
163 24, /* bitsize */
164 FALSE, /* pc_relative */
165 0, /* bitpos */
166 complain_overflow_bitfield, /* complain_on_overflow */
167 special, /* special_function */
168 "R_H8_DIR24R8", /* name */
169 TRUE, /* partial_inplace */
170 0xff000000, /* src_mask */
171 0x00ffffff, /* dst_mask */
172 FALSE), /* pcrel_offset */
173 #define R_H8_DIR32A16_X (R_H8_DIR24R8_X + 1)
174 HOWTO (R_H8_DIR32A16, /* type */
175 0, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 32, /* bitsize */
178 FALSE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_dont,/* complain_on_overflow */
181 special, /* special_function */
182 "R_H8_DIR32A16", /* name */
183 FALSE, /* partial_inplace */
184 0, /* src_mask */
185 0xffffffff, /* dst_mask */
186 FALSE), /* pcrel_offset */
187 #define R_H8_PCREL16_X (R_H8_DIR32A16_X + 1)
188 HOWTO (R_H8_PCREL16, /* type */
189 0, /* rightshift */
190 1, /* size (0 = byte, 1 = short, 2 = long) */
191 16, /* bitsize */
192 TRUE, /* pc_relative */
193 0, /* bitpos */
194 complain_overflow_signed,/* complain_on_overflow */
195 special, /* special_function */
196 "R_H8_PCREL16", /* name */
197 FALSE, /* partial_inplace */
198 0xffff, /* src_mask */
199 0xffff, /* dst_mask */
200 TRUE), /* pcrel_offset */
201 #define R_H8_PCREL8_X (R_H8_PCREL16_X + 1)
202 HOWTO (R_H8_PCREL8, /* type */
203 0, /* rightshift */
204 0, /* size (0 = byte, 1 = short, 2 = long) */
205 8, /* bitsize */
206 TRUE, /* pc_relative */
207 0, /* bitpos */
208 complain_overflow_signed,/* complain_on_overflow */
209 special, /* special_function */
210 "R_H8_PCREL8", /* name */
211 FALSE, /* partial_inplace */
212 0xff, /* src_mask */
213 0xff, /* dst_mask */
214 TRUE), /* pcrel_offset */
215 };
216
217 /* This structure is used to map BFD reloc codes to H8 ELF relocs. */
218
219 struct elf_reloc_map {
220 bfd_reloc_code_real_type bfd_reloc_val;
221 unsigned char howto_index;
222 };
223
224 /* An array mapping BFD reloc codes to H8 ELF relocs. */
225
226 static const struct elf_reloc_map h8_reloc_map[] = {
227 { BFD_RELOC_NONE, R_H8_NONE_X },
228 { BFD_RELOC_32, R_H8_DIR32_X },
229 { BFD_RELOC_16, R_H8_DIR16_X },
230 { BFD_RELOC_8, R_H8_DIR8_X },
231 { BFD_RELOC_H8_DIR16A8, R_H8_DIR16A8_X },
232 { BFD_RELOC_H8_DIR16R8, R_H8_DIR16R8_X },
233 { BFD_RELOC_H8_DIR24A8, R_H8_DIR24A8_X },
234 { BFD_RELOC_H8_DIR24R8, R_H8_DIR24R8_X },
235 { BFD_RELOC_H8_DIR32A16, R_H8_DIR32A16_X },
236 { BFD_RELOC_16_PCREL, R_H8_PCREL16_X },
237 { BFD_RELOC_8_PCREL, R_H8_PCREL8_X },
238 };
239
240
241 static reloc_howto_type *
242 elf32_h8_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
243 bfd_reloc_code_real_type code)
244 {
245 unsigned int i;
246
247 for (i = 0; i < sizeof (h8_reloc_map) / sizeof (struct elf_reloc_map); i++)
248 {
249 if (h8_reloc_map[i].bfd_reloc_val == code)
250 return &h8_elf_howto_table[(int) h8_reloc_map[i].howto_index];
251 }
252 return NULL;
253 }
254
255 static reloc_howto_type *
256 elf32_h8_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
257 const char *r_name)
258 {
259 unsigned int i;
260
261 for (i = 0;
262 i < sizeof (h8_elf_howto_table) / sizeof (h8_elf_howto_table[0]);
263 i++)
264 if (h8_elf_howto_table[i].name != NULL
265 && strcasecmp (h8_elf_howto_table[i].name, r_name) == 0)
266 return &h8_elf_howto_table[i];
267
268 return NULL;
269 }
270
271 static void
272 elf32_h8_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc,
273 Elf_Internal_Rela *elf_reloc)
274 {
275 unsigned int r;
276 unsigned int i;
277
278 r = ELF32_R_TYPE (elf_reloc->r_info);
279 for (i = 0; i < sizeof (h8_elf_howto_table) / sizeof (reloc_howto_type); i++)
280 if (h8_elf_howto_table[i].type == r)
281 {
282 bfd_reloc->howto = &h8_elf_howto_table[i];
283 return;
284 }
285 abort ();
286 }
287
288 static void
289 elf32_h8_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc,
290 Elf_Internal_Rela *elf_reloc ATTRIBUTE_UNUSED)
291 {
292 unsigned int r;
293
294 abort ();
295 r = ELF32_R_TYPE (elf_reloc->r_info);
296 bfd_reloc->howto = &h8_elf_howto_table[r];
297 }
298
299 /* Special handling for H8/300 relocs.
300 We only come here for pcrel stuff and return normally if not an -r link.
301 When doing -r, we can't do any arithmetic for the pcrel stuff, because
302 we support relaxing on the H8/300 series chips. */
303 static bfd_reloc_status_type
304 special (bfd *abfd ATTRIBUTE_UNUSED,
305 arelent *reloc_entry ATTRIBUTE_UNUSED,
306 asymbol *symbol ATTRIBUTE_UNUSED,
307 PTR data ATTRIBUTE_UNUSED,
308 asection *input_section ATTRIBUTE_UNUSED,
309 bfd *output_bfd,
310 char **error_message ATTRIBUTE_UNUSED)
311 {
312 if (output_bfd == (bfd *) NULL)
313 return bfd_reloc_continue;
314
315 /* Adjust the reloc address to that in the output section. */
316 reloc_entry->address += input_section->output_offset;
317 return bfd_reloc_ok;
318 }
319
320 /* Perform a relocation as part of a final link. */
321 static bfd_reloc_status_type
322 elf32_h8_final_link_relocate (unsigned long r_type, bfd *input_bfd,
323 bfd *output_bfd ATTRIBUTE_UNUSED,
324 asection *input_section ATTRIBUTE_UNUSED,
325 bfd_byte *contents, bfd_vma offset,
326 bfd_vma value, bfd_vma addend,
327 struct bfd_link_info *info ATTRIBUTE_UNUSED,
328 asection *sym_sec ATTRIBUTE_UNUSED,
329 int is_local ATTRIBUTE_UNUSED)
330 {
331 bfd_byte *hit_data = contents + offset;
332
333 switch (r_type)
334 {
335 case R_H8_NONE:
336 return bfd_reloc_ok;
337
338 case R_H8_DIR32:
339 case R_H8_DIR32A16:
340 case R_H8_DIR24A8:
341 value += addend;
342 bfd_put_32 (input_bfd, value, hit_data);
343 return bfd_reloc_ok;
344
345 case R_H8_DIR16:
346 case R_H8_DIR16A8:
347 case R_H8_DIR16R8:
348 value += addend;
349 bfd_put_16 (input_bfd, value, hit_data);
350 return bfd_reloc_ok;
351
352 /* AKA R_RELBYTE */
353 case R_H8_DIR8:
354 value += addend;
355
356 bfd_put_8 (input_bfd, value, hit_data);
357 return bfd_reloc_ok;
358
359 case R_H8_DIR24R8:
360 value += addend;
361
362 /* HIT_DATA is the address for the first byte for the relocated
363 value. Subtract 1 so that we can manipulate the data in 32-bit
364 hunks. */
365 hit_data--;
366
367 /* Clear out the top byte in value. */
368 value &= 0xffffff;
369
370 /* Retrieve the type byte for value from the section contents. */
371 value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000);
372
373 /* Now scribble it out in one 32-bit hunk. */
374 bfd_put_32 (input_bfd, value, hit_data);
375 return bfd_reloc_ok;
376
377 case R_H8_PCREL16:
378 value -= (input_section->output_section->vma
379 + input_section->output_offset);
380 value -= offset;
381 value += addend;
382
383 /* The value is relative to the start of the instruction,
384 not the relocation offset. Subtract 2 to account for
385 this minor issue. */
386 value -= 2;
387
388 bfd_put_16 (input_bfd, value, hit_data);
389 return bfd_reloc_ok;
390
391 case R_H8_PCREL8:
392 value -= (input_section->output_section->vma
393 + input_section->output_offset);
394 value -= offset;
395 value += addend;
396
397 /* The value is relative to the start of the instruction,
398 not the relocation offset. Subtract 1 to account for
399 this minor issue. */
400 value -= 1;
401
402 bfd_put_8 (input_bfd, value, hit_data);
403 return bfd_reloc_ok;
404
405 default:
406 return bfd_reloc_notsupported;
407 }
408 }
409 \f
410 /* Relocate an H8 ELF section. */
411 static bfd_boolean
412 elf32_h8_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
413 bfd *input_bfd, asection *input_section,
414 bfd_byte *contents, Elf_Internal_Rela *relocs,
415 Elf_Internal_Sym *local_syms,
416 asection **local_sections)
417 {
418 Elf_Internal_Shdr *symtab_hdr;
419 struct elf_link_hash_entry **sym_hashes;
420 Elf_Internal_Rela *rel, *relend;
421
422 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
423 sym_hashes = elf_sym_hashes (input_bfd);
424
425 rel = relocs;
426 relend = relocs + input_section->reloc_count;
427 for (; rel < relend; rel++)
428 {
429 unsigned int r_type;
430 unsigned long r_symndx;
431 Elf_Internal_Sym *sym;
432 asection *sec;
433 struct elf_link_hash_entry *h;
434 bfd_vma relocation;
435 bfd_reloc_status_type r;
436 arelent bfd_reloc;
437 reloc_howto_type *howto;
438
439 elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel);
440 howto = bfd_reloc.howto;
441
442 r_symndx = ELF32_R_SYM (rel->r_info);
443 r_type = ELF32_R_TYPE (rel->r_info);
444 h = NULL;
445 sym = NULL;
446 sec = NULL;
447 if (r_symndx < symtab_hdr->sh_info)
448 {
449 sym = local_syms + r_symndx;
450 sec = local_sections[r_symndx];
451 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
452 }
453 else
454 {
455 bfd_boolean unresolved_reloc, warned;
456
457 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
458 r_symndx, symtab_hdr, sym_hashes,
459 h, sec, relocation,
460 unresolved_reloc, warned);
461 }
462
463 if (sec != NULL && elf_discarded_section (sec))
464 {
465 /* For relocs against symbols from removed linkonce sections,
466 or sections discarded by a linker script, we just want the
467 section contents zeroed. Avoid any special processing. */
468 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
469 rel->r_info = 0;
470 rel->r_addend = 0;
471 continue;
472 }
473
474 if (info->relocatable)
475 continue;
476
477 r = elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd,
478 input_section,
479 contents, rel->r_offset,
480 relocation, rel->r_addend,
481 info, sec, h == NULL);
482
483 if (r != bfd_reloc_ok)
484 {
485 const char *name;
486 const char *msg = (const char *) 0;
487
488 if (h != NULL)
489 name = h->root.root.string;
490 else
491 {
492 name = (bfd_elf_string_from_elf_section
493 (input_bfd, symtab_hdr->sh_link, sym->st_name));
494 if (name == NULL || *name == '\0')
495 name = bfd_section_name (input_bfd, sec);
496 }
497
498 switch (r)
499 {
500 case bfd_reloc_overflow:
501 if (! ((*info->callbacks->reloc_overflow)
502 (info, (h ? &h->root : NULL), name, howto->name,
503 (bfd_vma) 0, input_bfd, input_section,
504 rel->r_offset)))
505 return FALSE;
506 break;
507
508 case bfd_reloc_undefined:
509 if (! ((*info->callbacks->undefined_symbol)
510 (info, name, input_bfd, input_section,
511 rel->r_offset, TRUE)))
512 return FALSE;
513 break;
514
515 case bfd_reloc_outofrange:
516 msg = _("internal error: out of range error");
517 goto common_error;
518
519 case bfd_reloc_notsupported:
520 msg = _("internal error: unsupported relocation error");
521 goto common_error;
522
523 case bfd_reloc_dangerous:
524 msg = _("internal error: dangerous error");
525 goto common_error;
526
527 default:
528 msg = _("internal error: unknown error");
529 /* fall through */
530
531 common_error:
532 if (!((*info->callbacks->warning)
533 (info, msg, name, input_bfd, input_section,
534 rel->r_offset)))
535 return FALSE;
536 break;
537 }
538 }
539 }
540
541 return TRUE;
542 }
543
544 /* Object files encode the specific H8 model they were compiled
545 for in the ELF flags field.
546
547 Examine that field and return the proper BFD machine type for
548 the object file. */
549 static unsigned long
550 elf32_h8_mach (flagword flags)
551 {
552 switch (flags & EF_H8_MACH)
553 {
554 case E_H8_MACH_H8300:
555 default:
556 return bfd_mach_h8300;
557
558 case E_H8_MACH_H8300H:
559 return bfd_mach_h8300h;
560
561 case E_H8_MACH_H8300S:
562 return bfd_mach_h8300s;
563
564 case E_H8_MACH_H8300HN:
565 return bfd_mach_h8300hn;
566
567 case E_H8_MACH_H8300SN:
568 return bfd_mach_h8300sn;
569
570 case E_H8_MACH_H8300SX:
571 return bfd_mach_h8300sx;
572
573 case E_H8_MACH_H8300SXN:
574 return bfd_mach_h8300sxn;
575 }
576 }
577
578 /* The final processing done just before writing out a H8 ELF object
579 file. We use this opportunity to encode the BFD machine type
580 into the flags field in the object file. */
581
582 static void
583 elf32_h8_final_write_processing (bfd *abfd,
584 bfd_boolean linker ATTRIBUTE_UNUSED)
585 {
586 unsigned long val;
587
588 switch (bfd_get_mach (abfd))
589 {
590 default:
591 case bfd_mach_h8300:
592 val = E_H8_MACH_H8300;
593 break;
594
595 case bfd_mach_h8300h:
596 val = E_H8_MACH_H8300H;
597 break;
598
599 case bfd_mach_h8300s:
600 val = E_H8_MACH_H8300S;
601 break;
602
603 case bfd_mach_h8300hn:
604 val = E_H8_MACH_H8300HN;
605 break;
606
607 case bfd_mach_h8300sn:
608 val = E_H8_MACH_H8300SN;
609 break;
610
611 case bfd_mach_h8300sx:
612 val = E_H8_MACH_H8300SX;
613 break;
614
615 case bfd_mach_h8300sxn:
616 val = E_H8_MACH_H8300SXN;
617 break;
618 }
619
620 elf_elfheader (abfd)->e_flags &= ~ (EF_H8_MACH);
621 elf_elfheader (abfd)->e_flags |= val;
622 }
623
624 /* Return nonzero if ABFD represents a valid H8 ELF object file; also
625 record the encoded machine type found in the ELF flags. */
626
627 static bfd_boolean
628 elf32_h8_object_p (bfd *abfd)
629 {
630 bfd_default_set_arch_mach (abfd, bfd_arch_h8300,
631 elf32_h8_mach (elf_elfheader (abfd)->e_flags));
632 return TRUE;
633 }
634
635 /* Merge backend specific data from an object file to the output
636 object file when linking. The only data we need to copy at this
637 time is the architecture/machine information. */
638
639 static bfd_boolean
640 elf32_h8_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
641 {
642 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
643 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
644 return TRUE;
645
646 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
647 && bfd_get_mach (obfd) < bfd_get_mach (ibfd))
648 {
649 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
650 bfd_get_mach (ibfd)))
651 return FALSE;
652 }
653
654 return TRUE;
655 }
656
657 /* This function handles relaxing for the H8..
658
659 There are a few relaxing opportunities available on the H8:
660
661 jmp/jsr:24 -> bra/bsr:8 2 bytes
662 The jmp may be completely eliminated if the previous insn is a
663 conditional branch to the insn after the jump. In that case
664 we invert the branch and delete the jump and save 4 bytes.
665
666 bCC:16 -> bCC:8 2 bytes
667 bsr:16 -> bsr:8 2 bytes
668
669 bset:16 -> bset:8 2 bytes
670 bset:24/32 -> bset:8 4 bytes
671 (also applicable to other bit manipulation instructions)
672
673 mov.b:16 -> mov.b:8 2 bytes
674 mov.b:24/32 -> mov.b:8 4 bytes
675
676 bset:24/32 -> bset:16 2 bytes
677 (also applicable to other bit manipulation instructions)
678
679 mov.[bwl]:24/32 -> mov.[bwl]:16 2 bytes */
680
681 static bfd_boolean
682 elf32_h8_relax_section (bfd *abfd, asection *sec,
683 struct bfd_link_info *link_info, bfd_boolean *again)
684 {
685 Elf_Internal_Shdr *symtab_hdr;
686 Elf_Internal_Rela *internal_relocs;
687 Elf_Internal_Rela *irel, *irelend;
688 bfd_byte *contents = NULL;
689 Elf_Internal_Sym *isymbuf = NULL;
690 static asection *last_input_section = NULL;
691 static Elf_Internal_Rela *last_reloc = NULL;
692
693 /* Assume nothing changes. */
694 *again = FALSE;
695
696 /* We don't have to do anything for a relocatable link, if
697 this section does not have relocs, or if this is not a
698 code section. */
699 if (link_info->relocatable
700 || (sec->flags & SEC_RELOC) == 0
701 || sec->reloc_count == 0
702 || (sec->flags & SEC_CODE) == 0)
703 return TRUE;
704
705 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
706
707 /* Get a copy of the native relocations. */
708 internal_relocs = (_bfd_elf_link_read_relocs
709 (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
710 link_info->keep_memory));
711 if (internal_relocs == NULL)
712 goto error_return;
713
714 if (sec != last_input_section)
715 last_reloc = NULL;
716
717 last_input_section = sec;
718
719 /* Walk through the relocs looking for relaxing opportunities. */
720 irelend = internal_relocs + sec->reloc_count;
721 for (irel = internal_relocs; irel < irelend; irel++)
722 {
723 bfd_vma symval;
724
725 {
726 arelent bfd_reloc;
727 reloc_howto_type *h;
728
729 elf32_h8_info_to_howto (abfd, &bfd_reloc, irel);
730 h = bfd_reloc.howto;
731 }
732 /* Keep track of the previous reloc so that we can delete
733 some long jumps created by the compiler. */
734 if (irel != internal_relocs)
735 last_reloc = irel - 1;
736
737 if (ELF32_R_TYPE (irel->r_info) != R_H8_DIR24R8
738 && ELF32_R_TYPE (irel->r_info) != R_H8_PCREL16
739 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR16A8
740 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR24A8
741 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR32A16)
742 continue;
743
744 /* Get the section contents if we haven't done so already. */
745 if (contents == NULL)
746 {
747 /* Get cached copy if it exists. */
748 if (elf_section_data (sec)->this_hdr.contents != NULL)
749 contents = elf_section_data (sec)->this_hdr.contents;
750 else
751 {
752 /* Go get them off disk. */
753 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
754 goto error_return;
755 }
756 }
757
758 /* Read this BFD's local symbols if we haven't done so already. */
759 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
760 {
761 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
762 if (isymbuf == NULL)
763 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
764 symtab_hdr->sh_info, 0,
765 NULL, NULL, NULL);
766 if (isymbuf == NULL)
767 goto error_return;
768 }
769
770 /* Get the value of the symbol referred to by the reloc. */
771 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
772 {
773 /* A local symbol. */
774 Elf_Internal_Sym *isym;
775 asection *sym_sec;
776
777 isym = isymbuf + ELF32_R_SYM (irel->r_info);
778 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
779 symval = isym->st_value;
780 /* If the reloc is absolute, it will not have
781 a symbol or section associated with it. */
782 if (sym_sec)
783 symval += sym_sec->output_section->vma
784 + sym_sec->output_offset;
785 }
786 else
787 {
788 unsigned long indx;
789 struct elf_link_hash_entry *h;
790
791 /* An external symbol. */
792 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
793 h = elf_sym_hashes (abfd)[indx];
794 BFD_ASSERT (h != NULL);
795 if (h->root.type != bfd_link_hash_defined
796 && h->root.type != bfd_link_hash_defweak)
797 {
798 /* This appears to be a reference to an undefined
799 symbol. Just ignore it--it will be caught by the
800 regular reloc processing. */
801 continue;
802 }
803
804 symval = (h->root.u.def.value
805 + h->root.u.def.section->output_section->vma
806 + h->root.u.def.section->output_offset);
807 }
808
809 /* For simplicity of coding, we are going to modify the section
810 contents, the section relocs, and the BFD symbol table. We
811 must tell the rest of the code not to free up this
812 information. It would be possible to instead create a table
813 of changes which have to be made, as is done in coff-mips.c;
814 that would be more work, but would require less memory when
815 the linker is run. */
816 switch (ELF32_R_TYPE (irel->r_info))
817 {
818 /* Try to turn a 24-bit absolute branch/call into an 8-bit
819 pc-relative branch/call. */
820 case R_H8_DIR24R8:
821 {
822 bfd_vma value = symval + irel->r_addend;
823 bfd_vma dot, gap;
824
825 /* Get the address of this instruction. */
826 dot = (sec->output_section->vma
827 + sec->output_offset + irel->r_offset - 1);
828
829 /* Compute the distance from this insn to the branch target. */
830 gap = value - dot;
831
832 /* If the distance is within -126..+130 inclusive, then we can
833 relax this jump. +130 is valid since the target will move
834 two bytes closer if we do relax this branch. */
835 if ((int) gap >= -126 && (int) gap <= 130)
836 {
837 unsigned char code;
838
839 /* Note that we've changed the relocs, section contents,
840 etc. */
841 elf_section_data (sec)->relocs = internal_relocs;
842 elf_section_data (sec)->this_hdr.contents = contents;
843 symtab_hdr->contents = (unsigned char *) isymbuf;
844
845 /* Get the instruction code being relaxed. */
846 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
847
848 /* If the previous instruction conditionally jumped around
849 this instruction, we may be able to reverse the condition
850 and redirect the previous instruction to the target of
851 this instruction.
852
853 Such sequences are used by the compiler to deal with
854 long conditional branches.
855
856 Only perform this optimisation for jumps (code 0x5a) not
857 subroutine calls, as otherwise it could transform:
858
859 mov.w r0,r0
860 beq .L1
861 jsr @_bar
862 .L1: rts
863 _bar: rts
864 into:
865 mov.w r0,r0
866 bne _bar
867 rts
868 _bar: rts
869
870 which changes the call (jsr) into a branch (bne). */
871 if (code == 0x5a
872 && (int) gap <= 130
873 && (int) gap >= -128
874 && last_reloc
875 && ELF32_R_TYPE (last_reloc->r_info) == R_H8_PCREL8
876 && ELF32_R_SYM (last_reloc->r_info) < symtab_hdr->sh_info)
877 {
878 bfd_vma last_value;
879 asection *last_sym_sec;
880 Elf_Internal_Sym *last_sym;
881
882 /* We will need to examine the symbol used by the
883 previous relocation. */
884
885 last_sym = isymbuf + ELF32_R_SYM (last_reloc->r_info);
886 last_sym_sec
887 = bfd_section_from_elf_index (abfd, last_sym->st_shndx);
888 last_value = (last_sym->st_value
889 + last_sym_sec->output_section->vma
890 + last_sym_sec->output_offset);
891
892 /* Verify that the previous relocation was for a
893 branch around this instruction and that no symbol
894 exists at the current location. */
895 if (last_value == dot + 4
896 && last_reloc->r_offset + 2 == irel->r_offset
897 && ! elf32_h8_symbol_address_p (abfd, sec, dot))
898 {
899 /* We can eliminate this jump. Twiddle the
900 previous relocation as necessary. */
901 irel->r_info
902 = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
903 ELF32_R_TYPE (R_H8_NONE));
904
905 last_reloc->r_info
906 = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
907 ELF32_R_TYPE (R_H8_PCREL8));
908 last_reloc->r_addend = irel->r_addend;
909
910 code = bfd_get_8 (abfd,
911 contents + last_reloc->r_offset - 1);
912 code ^= 1;
913 bfd_put_8 (abfd,
914 code,
915 contents + last_reloc->r_offset - 1);
916
917 /* Delete four bytes of data. */
918 if (!elf32_h8_relax_delete_bytes (abfd, sec,
919 irel->r_offset - 1,
920 4))
921 goto error_return;
922
923 *again = TRUE;
924 break;
925 }
926 }
927
928 if (code == 0x5e)
929 /* This is jsr. */
930 bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 1);
931 else if (code == 0x5a)
932 /* This is jmp. */
933 bfd_put_8 (abfd, 0x40, contents + irel->r_offset - 1);
934 else
935 abort ();
936
937 /* Fix the relocation's type. */
938 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
939 R_H8_PCREL8);
940
941 /* Delete two bytes of data. */
942 if (!elf32_h8_relax_delete_bytes (abfd, sec,
943 irel->r_offset + 1, 2))
944 goto error_return;
945
946 /* That will change things, so, we should relax again.
947 Note that this is not required, and it may be slow. */
948 *again = TRUE;
949 }
950 break;
951 }
952
953 /* Try to turn a 16-bit pc-relative branch into a 8-bit pc-relative
954 branch. */
955 case R_H8_PCREL16:
956 {
957 bfd_vma value = symval + irel->r_addend;
958 bfd_vma dot;
959 bfd_vma gap;
960
961 /* Get the address of this instruction. */
962 dot = (sec->output_section->vma
963 + sec->output_offset
964 + irel->r_offset - 2);
965
966 gap = value - dot;
967
968 /* If the distance is within -126..+130 inclusive, then we can
969 relax this jump. +130 is valid since the target will move
970 two bytes closer if we do relax this branch. */
971 if ((int) gap >= -126 && (int) gap <= 130)
972 {
973 unsigned char code;
974
975 /* Note that we've changed the relocs, section contents,
976 etc. */
977 elf_section_data (sec)->relocs = internal_relocs;
978 elf_section_data (sec)->this_hdr.contents = contents;
979 symtab_hdr->contents = (unsigned char *) isymbuf;
980
981 /* Get the opcode. */
982 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
983
984 if (code == 0x58)
985 {
986 /* bCC:16 -> bCC:8 */
987 /* Get the second byte of the original insn, which
988 contains the condition code. */
989 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
990
991 /* Compute the fisrt byte of the relaxed
992 instruction. The original sequence 0x58 0xX0
993 is relaxed to 0x4X, where X represents the
994 condition code. */
995 code &= 0xf0;
996 code >>= 4;
997 code |= 0x40;
998 bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
999 }
1000 else if (code == 0x5c)
1001 /* This is bsr. */
1002 bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 2);
1003 else
1004 /* Might be MOVSD. */
1005 break;
1006
1007 /* Fix the relocation's type. */
1008 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1009 R_H8_PCREL8);
1010 irel->r_offset--;
1011
1012 /* Delete two bytes of data. */
1013 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1014 irel->r_offset + 1, 2))
1015 goto error_return;
1016
1017 /* That will change things, so, we should relax again.
1018 Note that this is not required, and it may be slow. */
1019 *again = TRUE;
1020 }
1021 break;
1022 }
1023
1024 /* This is a 16-bit absolute address in one of the following
1025 instructions:
1026
1027 "band", "bclr", "biand", "bild", "bior", "bist", "bixor",
1028 "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
1029 "mov.b"
1030
1031 We may relax this into an 8-bit absolute address if it's in
1032 the right range. */
1033 case R_H8_DIR16A8:
1034 {
1035 bfd_vma value;
1036
1037 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1038 if (value >= 0xffffff00u)
1039 {
1040 unsigned char code;
1041 unsigned char temp_code;
1042
1043 /* Note that we've changed the relocs, section contents,
1044 etc. */
1045 elf_section_data (sec)->relocs = internal_relocs;
1046 elf_section_data (sec)->this_hdr.contents = contents;
1047 symtab_hdr->contents = (unsigned char *) isymbuf;
1048
1049 /* Get the opcode. */
1050 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
1051
1052 /* All instructions with R_H8_DIR16A8 start with
1053 0x6a. */
1054 if (code != 0x6a)
1055 abort ();
1056
1057 temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1058 /* If this is a mov.b instruction, clear the lower
1059 nibble, which contains the source/destination
1060 register number. */
1061 if ((temp_code & 0x10) != 0x10)
1062 temp_code &= 0xf0;
1063
1064 switch (temp_code)
1065 {
1066 case 0x00:
1067 /* This is mov.b @aa:16,Rd. */
1068 bfd_put_8 (abfd, (code & 0xf) | 0x20,
1069 contents + irel->r_offset - 2);
1070 break;
1071 case 0x80:
1072 /* This is mov.b Rs,@aa:16. */
1073 bfd_put_8 (abfd, (code & 0xf) | 0x30,
1074 contents + irel->r_offset - 2);
1075 break;
1076 case 0x18:
1077 /* This is a bit-maniputation instruction that
1078 stores one bit into memory, one of "bclr",
1079 "bist", "bnot", "bset", and "bst". */
1080 bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
1081 break;
1082 case 0x10:
1083 /* This is a bit-maniputation instruction that
1084 loads one bit from memory, one of "band",
1085 "biand", "bild", "bior", "bixor", "bld", "bor",
1086 "btst", and "bxor". */
1087 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
1088 break;
1089 default:
1090 abort ();
1091 }
1092
1093 /* Fix the relocation's type. */
1094 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1095 R_H8_DIR8);
1096
1097 /* Move the relocation. */
1098 irel->r_offset--;
1099
1100 /* Delete two bytes of data. */
1101 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1102 irel->r_offset + 1, 2))
1103 goto error_return;
1104
1105 /* That will change things, so, we should relax again.
1106 Note that this is not required, and it may be slow. */
1107 *again = TRUE;
1108 }
1109 break;
1110 }
1111
1112 /* This is a 24-bit absolute address in one of the following
1113 instructions:
1114
1115 "band", "bclr", "biand", "bild", "bior", "bist", "bixor",
1116 "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
1117 "mov.b"
1118
1119 We may relax this into an 8-bit absolute address if it's in
1120 the right range. */
1121 case R_H8_DIR24A8:
1122 {
1123 bfd_vma value;
1124
1125 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1126 if (value >= 0xffffff00u)
1127 {
1128 unsigned char code;
1129 unsigned char temp_code;
1130
1131 /* Note that we've changed the relocs, section contents,
1132 etc. */
1133 elf_section_data (sec)->relocs = internal_relocs;
1134 elf_section_data (sec)->this_hdr.contents = contents;
1135 symtab_hdr->contents = (unsigned char *) isymbuf;
1136
1137 /* Get the opcode. */
1138 code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
1139
1140 /* All instructions with R_H8_DIR24A8 start with
1141 0x6a. */
1142 if (code != 0x6a)
1143 abort ();
1144
1145 temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1146
1147 /* If this is a mov.b instruction, clear the lower
1148 nibble, which contains the source/destination
1149 register number. */
1150 if ((temp_code & 0x30) != 0x30)
1151 temp_code &= 0xf0;
1152
1153 switch (temp_code)
1154 {
1155 case 0x20:
1156 /* This is mov.b @aa:24/32,Rd. */
1157 bfd_put_8 (abfd, (code & 0xf) | 0x20,
1158 contents + irel->r_offset - 2);
1159 break;
1160 case 0xa0:
1161 /* This is mov.b Rs,@aa:24/32. */
1162 bfd_put_8 (abfd, (code & 0xf) | 0x30,
1163 contents + irel->r_offset - 2);
1164 break;
1165 case 0x38:
1166 /* This is a bit-maniputation instruction that
1167 stores one bit into memory, one of "bclr",
1168 "bist", "bnot", "bset", and "bst". */
1169 bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
1170 break;
1171 case 0x30:
1172 /* This is a bit-maniputation instruction that
1173 loads one bit from memory, one of "band",
1174 "biand", "bild", "bior", "bixor", "bld", "bor",
1175 "btst", and "bxor". */
1176 bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
1177 break;
1178 default:
1179 abort();
1180 }
1181
1182 /* Fix the relocation's type. */
1183 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1184 R_H8_DIR8);
1185 irel->r_offset--;
1186
1187 /* Delete two bytes of data. */
1188 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1189 irel->r_offset + 1, 4))
1190 goto error_return;
1191
1192 /* That will change things, so, we should relax again.
1193 Note that this is not required, and it may be slow. */
1194 *again = TRUE;
1195 break;
1196 }
1197 }
1198
1199 /* Fall through. */
1200
1201 /* This is a 24-/32-bit absolute address in one of the
1202 following instructions:
1203
1204 "band", "bclr", "biand", "bild", "bior", "bist",
1205 "bixor", "bld", "bnot", "bor", "bset", "bst", "btst",
1206 "bxor", "ldc.w", "stc.w" and "mov.[bwl]"
1207
1208 We may relax this into an 16-bit absolute address if it's
1209 in the right range. */
1210 case R_H8_DIR32A16:
1211 {
1212 bfd_vma value;
1213
1214 value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
1215 if (value <= 0x7fff || value >= 0xffff8000u)
1216 {
1217 unsigned char code;
1218 unsigned char op0, op1, op2, op3;
1219 unsigned char *op_ptr;
1220
1221 /* Note that we've changed the relocs, section contents,
1222 etc. */
1223 elf_section_data (sec)->relocs = internal_relocs;
1224 elf_section_data (sec)->this_hdr.contents = contents;
1225 symtab_hdr->contents = (unsigned char *) isymbuf;
1226
1227 if (irel->r_offset >= 4)
1228 {
1229 /* Check for 4-byte MOVA relaxation. */
1230 int second_reloc = 0;
1231
1232 op_ptr = contents + irel->r_offset - 4;
1233
1234 if (last_reloc)
1235 {
1236 arelent bfd_reloc;
1237 reloc_howto_type *h;
1238 bfd_vma last_reloc_size;
1239
1240 elf32_h8_info_to_howto (abfd, &bfd_reloc, last_reloc);
1241 h = bfd_reloc.howto;
1242 last_reloc_size = 1 << h->size;
1243 if (last_reloc->r_offset + last_reloc_size
1244 == irel->r_offset)
1245 {
1246 op_ptr -= last_reloc_size;
1247 second_reloc = 1;
1248 }
1249 }
1250 if (irel < irelend)
1251 {
1252 Elf_Internal_Rela *next_reloc = irel + 1;
1253 arelent bfd_reloc;
1254 reloc_howto_type *h;
1255 bfd_vma next_reloc_size;
1256
1257 elf32_h8_info_to_howto (abfd, &bfd_reloc, next_reloc);
1258 h = bfd_reloc.howto;
1259 next_reloc_size = 1 << h->size;
1260 if (next_reloc->r_offset + next_reloc_size
1261 == irel->r_offset)
1262 {
1263 op_ptr -= next_reloc_size;
1264 second_reloc = 1;
1265 }
1266 }
1267
1268 op0 = bfd_get_8 (abfd, op_ptr + 0);
1269 op1 = bfd_get_8 (abfd, op_ptr + 1);
1270 op2 = bfd_get_8 (abfd, op_ptr + 2);
1271 op3 = bfd_get_8 (abfd, op_ptr + 3);
1272
1273 if (op0 == 0x01
1274 && (op1 & 0xdf) == 0x5f
1275 && (op2 & 0x40) == 0x40
1276 && (op3 & 0x80) == 0x80)
1277 {
1278 if ((op2 & 0x08) == 0)
1279 second_reloc = 1;
1280
1281 if (second_reloc)
1282 {
1283 op3 &= ~0x08;
1284 bfd_put_8 (abfd, op3, op_ptr + 3);
1285 }
1286 else
1287 {
1288 op2 &= ~0x08;
1289 bfd_put_8 (abfd, op2, op_ptr + 2);
1290 }
1291 goto r_h8_dir32a16_common;
1292 }
1293 }
1294
1295 /* Now check for short version of MOVA. */
1296 op_ptr = contents + irel->r_offset - 2;
1297 op0 = bfd_get_8 (abfd, op_ptr + 0);
1298 op1 = bfd_get_8 (abfd, op_ptr + 1);
1299
1300 if (op0 == 0x7a
1301 && (op1 & 0x88) == 0x80)
1302 {
1303 op1 |= 0x08;
1304 bfd_put_8 (abfd, op1, op_ptr + 1);
1305 goto r_h8_dir32a16_common;
1306 }
1307
1308 /* Get the opcode. */
1309 code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
1310
1311 /* Fix the opcode. For all the instructions that
1312 belong to this relaxation, we simply need to turn
1313 off bit 0x20 in the previous byte. */
1314 code &= ~0x20;
1315
1316 bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
1317
1318 r_h8_dir32a16_common:
1319 /* Fix the relocation's type. */
1320 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1321 R_H8_DIR16);
1322
1323 /* Delete two bytes of data. */
1324 if (!elf32_h8_relax_delete_bytes (abfd, sec,
1325 irel->r_offset + 1, 2))
1326 goto error_return;
1327
1328 /* That will change things, so, we should relax again.
1329 Note that this is not required, and it may be slow. */
1330 *again = TRUE;
1331 }
1332 break;
1333 }
1334
1335 default:
1336 break;
1337 }
1338 }
1339
1340 if (isymbuf != NULL
1341 && symtab_hdr->contents != (unsigned char *) isymbuf)
1342 {
1343 if (! link_info->keep_memory)
1344 free (isymbuf);
1345 else
1346 symtab_hdr->contents = (unsigned char *) isymbuf;
1347 }
1348
1349 if (contents != NULL
1350 && elf_section_data (sec)->this_hdr.contents != contents)
1351 {
1352 if (! link_info->keep_memory)
1353 free (contents);
1354 else
1355 {
1356 /* Cache the section contents for elf_link_input_bfd. */
1357 elf_section_data (sec)->this_hdr.contents = contents;
1358 }
1359 }
1360
1361 if (internal_relocs != NULL
1362 && elf_section_data (sec)->relocs != internal_relocs)
1363 free (internal_relocs);
1364
1365 return TRUE;
1366
1367 error_return:
1368 if (isymbuf != NULL
1369 && symtab_hdr->contents != (unsigned char *) isymbuf)
1370 free (isymbuf);
1371 if (contents != NULL
1372 && elf_section_data (sec)->this_hdr.contents != contents)
1373 free (contents);
1374 if (internal_relocs != NULL
1375 && elf_section_data (sec)->relocs != internal_relocs)
1376 free (internal_relocs);
1377 return FALSE;
1378 }
1379
1380 /* Delete some bytes from a section while relaxing. */
1381
1382 static bfd_boolean
1383 elf32_h8_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count)
1384 {
1385 Elf_Internal_Shdr *symtab_hdr;
1386 unsigned int sec_shndx;
1387 bfd_byte *contents;
1388 Elf_Internal_Rela *irel, *irelend;
1389 Elf_Internal_Rela *irelalign;
1390 Elf_Internal_Sym *isym;
1391 Elf_Internal_Sym *isymend;
1392 bfd_vma toaddr;
1393 struct elf_link_hash_entry **sym_hashes;
1394 struct elf_link_hash_entry **end_hashes;
1395 unsigned int symcount;
1396
1397 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1398
1399 contents = elf_section_data (sec)->this_hdr.contents;
1400
1401 /* The deletion must stop at the next ALIGN reloc for an aligment
1402 power larger than the number of bytes we are deleting. */
1403
1404 irelalign = NULL;
1405 toaddr = sec->size;
1406
1407 irel = elf_section_data (sec)->relocs;
1408 irelend = irel + sec->reloc_count;
1409
1410 /* Actually delete the bytes. */
1411 memmove (contents + addr, contents + addr + count,
1412 (size_t) (toaddr - addr - count));
1413 sec->size -= count;
1414
1415 /* Adjust all the relocs. */
1416 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
1417 {
1418 /* Get the new reloc address. */
1419 if ((irel->r_offset > addr
1420 && irel->r_offset < toaddr))
1421 irel->r_offset -= count;
1422 }
1423
1424 /* Adjust the local symbols defined in this section. */
1425 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1426 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
1427 isymend = isym + symtab_hdr->sh_info;
1428 for (; isym < isymend; isym++)
1429 {
1430 if (isym->st_shndx == sec_shndx
1431 && isym->st_value > addr
1432 && isym->st_value < toaddr)
1433 isym->st_value -= count;
1434 }
1435
1436 /* Now adjust the global symbols defined in this section. */
1437 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1438 - symtab_hdr->sh_info);
1439 sym_hashes = elf_sym_hashes (abfd);
1440 end_hashes = sym_hashes + symcount;
1441 for (; sym_hashes < end_hashes; sym_hashes++)
1442 {
1443 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1444 if ((sym_hash->root.type == bfd_link_hash_defined
1445 || sym_hash->root.type == bfd_link_hash_defweak)
1446 && sym_hash->root.u.def.section == sec
1447 && sym_hash->root.u.def.value > addr
1448 && sym_hash->root.u.def.value < toaddr)
1449 {
1450 sym_hash->root.u.def.value -= count;
1451 }
1452 }
1453
1454 return TRUE;
1455 }
1456
1457 /* Return TRUE if a symbol exists at the given address, else return
1458 FALSE. */
1459 static bfd_boolean
1460 elf32_h8_symbol_address_p (bfd *abfd, asection *sec, bfd_vma addr)
1461 {
1462 Elf_Internal_Shdr *symtab_hdr;
1463 unsigned int sec_shndx;
1464 Elf_Internal_Sym *isym;
1465 Elf_Internal_Sym *isymend;
1466 struct elf_link_hash_entry **sym_hashes;
1467 struct elf_link_hash_entry **end_hashes;
1468 unsigned int symcount;
1469
1470 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1471
1472 /* Examine all the symbols. */
1473 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1474 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
1475 isymend = isym + symtab_hdr->sh_info;
1476 for (; isym < isymend; isym++)
1477 {
1478 if (isym->st_shndx == sec_shndx
1479 && isym->st_value == addr)
1480 return TRUE;
1481 }
1482
1483 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1484 - symtab_hdr->sh_info);
1485 sym_hashes = elf_sym_hashes (abfd);
1486 end_hashes = sym_hashes + symcount;
1487 for (; sym_hashes < end_hashes; sym_hashes++)
1488 {
1489 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1490 if ((sym_hash->root.type == bfd_link_hash_defined
1491 || sym_hash->root.type == bfd_link_hash_defweak)
1492 && sym_hash->root.u.def.section == sec
1493 && sym_hash->root.u.def.value == addr)
1494 return TRUE;
1495 }
1496
1497 return FALSE;
1498 }
1499
1500 /* This is a version of bfd_generic_get_relocated_section_contents
1501 which uses elf32_h8_relocate_section. */
1502
1503 static bfd_byte *
1504 elf32_h8_get_relocated_section_contents (bfd *output_bfd,
1505 struct bfd_link_info *link_info,
1506 struct bfd_link_order *link_order,
1507 bfd_byte *data,
1508 bfd_boolean relocatable,
1509 asymbol **symbols)
1510 {
1511 Elf_Internal_Shdr *symtab_hdr;
1512 asection *input_section = link_order->u.indirect.section;
1513 bfd *input_bfd = input_section->owner;
1514 asection **sections = NULL;
1515 Elf_Internal_Rela *internal_relocs = NULL;
1516 Elf_Internal_Sym *isymbuf = NULL;
1517
1518 /* We only need to handle the case of relaxing, or of having a
1519 particular set of section contents, specially. */
1520 if (relocatable
1521 || elf_section_data (input_section)->this_hdr.contents == NULL)
1522 return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
1523 link_order, data,
1524 relocatable,
1525 symbols);
1526
1527 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1528
1529 memcpy (data, elf_section_data (input_section)->this_hdr.contents,
1530 (size_t) input_section->size);
1531
1532 if ((input_section->flags & SEC_RELOC) != 0
1533 && input_section->reloc_count > 0)
1534 {
1535 asection **secpp;
1536 Elf_Internal_Sym *isym, *isymend;
1537 bfd_size_type amt;
1538
1539 internal_relocs = (_bfd_elf_link_read_relocs
1540 (input_bfd, input_section, (PTR) NULL,
1541 (Elf_Internal_Rela *) NULL, FALSE));
1542 if (internal_relocs == NULL)
1543 goto error_return;
1544
1545 if (symtab_hdr->sh_info != 0)
1546 {
1547 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1548 if (isymbuf == NULL)
1549 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
1550 symtab_hdr->sh_info, 0,
1551 NULL, NULL, NULL);
1552 if (isymbuf == NULL)
1553 goto error_return;
1554 }
1555
1556 amt = symtab_hdr->sh_info;
1557 amt *= sizeof (asection *);
1558 sections = (asection **) bfd_malloc (amt);
1559 if (sections == NULL && amt != 0)
1560 goto error_return;
1561
1562 isymend = isymbuf + symtab_hdr->sh_info;
1563 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
1564 {
1565 asection *isec;
1566
1567 if (isym->st_shndx == SHN_UNDEF)
1568 isec = bfd_und_section_ptr;
1569 else if (isym->st_shndx == SHN_ABS)
1570 isec = bfd_abs_section_ptr;
1571 else if (isym->st_shndx == SHN_COMMON)
1572 isec = bfd_com_section_ptr;
1573 else
1574 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
1575
1576 *secpp = isec;
1577 }
1578
1579 if (! elf32_h8_relocate_section (output_bfd, link_info, input_bfd,
1580 input_section, data, internal_relocs,
1581 isymbuf, sections))
1582 goto error_return;
1583
1584 if (sections != NULL)
1585 free (sections);
1586 if (isymbuf != NULL
1587 && symtab_hdr->contents != (unsigned char *) isymbuf)
1588 free (isymbuf);
1589 if (elf_section_data (input_section)->relocs != internal_relocs)
1590 free (internal_relocs);
1591 }
1592
1593 return data;
1594
1595 error_return:
1596 if (sections != NULL)
1597 free (sections);
1598 if (isymbuf != NULL
1599 && symtab_hdr->contents != (unsigned char *) isymbuf)
1600 free (isymbuf);
1601 if (internal_relocs != NULL
1602 && elf_section_data (input_section)->relocs != internal_relocs)
1603 free (internal_relocs);
1604 return NULL;
1605 }
1606
1607
1608 #define TARGET_BIG_SYM bfd_elf32_h8300_vec
1609 #define TARGET_BIG_NAME "elf32-h8300"
1610 #define ELF_ARCH bfd_arch_h8300
1611 #define ELF_MACHINE_CODE EM_H8_300
1612 #define ELF_MAXPAGESIZE 0x1
1613 #define bfd_elf32_bfd_reloc_type_lookup elf32_h8_reloc_type_lookup
1614 #define bfd_elf32_bfd_reloc_name_lookup elf32_h8_reloc_name_lookup
1615 #define elf_info_to_howto elf32_h8_info_to_howto
1616 #define elf_info_to_howto_rel elf32_h8_info_to_howto_rel
1617
1618 /* So we can set/examine bits in e_flags to get the specific
1619 H8 architecture in use. */
1620 #define elf_backend_final_write_processing \
1621 elf32_h8_final_write_processing
1622 #define elf_backend_object_p \
1623 elf32_h8_object_p
1624 #define bfd_elf32_bfd_merge_private_bfd_data \
1625 elf32_h8_merge_private_bfd_data
1626
1627 /* ??? when elf_backend_relocate_section is not defined, elf32-target.h
1628 defaults to using _bfd_generic_link_hash_table_create, but
1629 bfd_elf_size_dynamic_sections uses
1630 dynobj = elf_hash_table (info)->dynobj;
1631 and thus requires an elf hash table. */
1632 #define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create
1633
1634 /* Use an H8 specific linker, not the ELF generic linker. */
1635 #define elf_backend_relocate_section elf32_h8_relocate_section
1636 #define elf_backend_rela_normal 1
1637 #define elf_backend_can_gc_sections 1
1638
1639 /* And relaxing stuff. */
1640 #define bfd_elf32_bfd_relax_section elf32_h8_relax_section
1641 #define bfd_elf32_bfd_get_relocated_section_contents \
1642 elf32_h8_get_relocated_section_contents
1643
1644
1645 #include "elf32-target.h"
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