1 /* M16C/M32C specific support for 32-bit ELF.
2 Copyright (C) 2005-2024 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "libbfd.h"
24 #include "elf-bfd.h"
25 #include "elf/m32c.h"
26 #include "libiberty.h"
27
28 /* Forward declarations. */
29 static reloc_howto_type * m32c_reloc_type_lookup
30 (bfd *, bfd_reloc_code_real_type);
31 static bool m32c_info_to_howto_rela
32 (bfd *, arelent *, Elf_Internal_Rela *);
33 static int m32c_elf_relocate_section
34 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
35 static bool m32c_elf_check_relocs
36 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
37 static bool m32c_elf_relax_delete_bytes (bfd *, asection *, bfd_vma, int);
38 #ifdef DEBUG
39 char * m32c_get_reloc (long reloc);
40 void dump_symtab (bfd *, void *, void *);
41 #endif
42 static bool m32c_elf_relax_section
43 (bfd *abfd, asection *sec, struct bfd_link_info *link_info, bool *again);
44 static bfd_reloc_status_type m32c_apply_reloc_24
45 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
46
47
48 static reloc_howto_type m32c_elf_howto_table [] =
49 {
50 /* This reloc does nothing. */
51 HOWTO (R_M32C_NONE, /* type */
52 0, /* rightshift */
53 0, /* size */
54 0, /* bitsize */
55 false, /* pc_relative */
56 0, /* bitpos */
57 complain_overflow_dont, /* complain_on_overflow */
58 bfd_elf_generic_reloc, /* special_function */
59 "R_M32C_NONE", /* name */
60 false, /* partial_inplace */
61 0, /* src_mask */
62 0, /* dst_mask */
63 false), /* pcrel_offset */
64
65 /* GCC intentionally overflows these next two in order to work
66 around limitations in the addressing modes, so don't complain
67 about overflow. */
68 HOWTO (R_M32C_16, /* type */
69 0, /* rightshift */
70 2, /* size */
71 16, /* bitsize */
72 false, /* pc_relative */
73 0, /* bitpos */
74 complain_overflow_dont, /* complain_on_overflow */
75 bfd_elf_generic_reloc, /* special_function */
76 "R_M32C_16", /* name */
77 false, /* partial_inplace */
78 0, /* src_mask */
79 0xffff, /* dst_mask */
80 false), /* pcrel_offset */
81
82 HOWTO (R_M32C_24, /* type */
83 0, /* rightshift */
84 4, /* size */
85 24, /* bitsize */
86 false, /* pc_relative */
87 0, /* bitpos */
88 complain_overflow_dont, /* complain_on_overflow */
89 m32c_apply_reloc_24, /* special_function */
90 "R_M32C_24", /* name */
91 false, /* partial_inplace */
92 0, /* src_mask */
93 0xffffff, /* dst_mask */
94 false), /* pcrel_offset */
95
96 HOWTO (R_M32C_32, /* type */
97 0, /* rightshift */
98 4, /* size */
99 32, /* bitsize */
100 false, /* pc_relative */
101 0, /* bitpos */
102 complain_overflow_bitfield, /* complain_on_overflow */
103 bfd_elf_generic_reloc, /* special_function */
104 "R_M32C_32", /* name */
105 false, /* partial_inplace */
106 0, /* src_mask */
107 0xffffffff, /* dst_mask */
108 false), /* pcrel_offset */
109
110 HOWTO (R_M32C_8_PCREL, /* type */
111 0, /* rightshift */
112 1, /* size */
113 8, /* bitsize */
114 true, /* pc_relative */
115 0, /* bitpos */
116 complain_overflow_signed, /* complain_on_overflow */
117 bfd_elf_generic_reloc, /* special_function */
118 "R_M32C_8_PCREL", /* name */
119 false, /* partial_inplace */
120 0, /* src_mask */
121 0xff, /* dst_mask */
122 true), /* pcrel_offset */
123
124 HOWTO (R_M32C_16_PCREL, /* type */
125 0, /* rightshift */
126 2, /* size */
127 16, /* bitsize */
128 true, /* pc_relative */
129 0, /* bitpos */
130 complain_overflow_signed, /* complain_on_overflow */
131 bfd_elf_generic_reloc, /* special_function */
132 "R_M32C_16_PCREL", /* name */
133 false, /* partial_inplace */
134 0, /* src_mask */
135 0xffff, /* dst_mask */
136 true), /* pcrel_offset */
137
138 HOWTO (R_M32C_8, /* type */
139 0, /* rightshift */
140 1, /* size */
141 8, /* bitsize */
142 false, /* pc_relative */
143 0, /* bitpos */
144 complain_overflow_unsigned, /* complain_on_overflow */
145 bfd_elf_generic_reloc, /* special_function */
146 "R_M32C_8", /* name */
147 false, /* partial_inplace */
148 0, /* src_mask */
149 0xff, /* dst_mask */
150 false), /* pcrel_offset */
151
152 HOWTO (R_M32C_LO16, /* type */
153 0, /* rightshift */
154 2, /* size */
155 16, /* bitsize */
156 false, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_dont, /* complain_on_overflow */
159 bfd_elf_generic_reloc, /* special_function */
160 "R_M32C_LO16", /* name */
161 false, /* partial_inplace */
162 0, /* src_mask */
163 0xffff, /* dst_mask */
164 false), /* pcrel_offset */
165
166 HOWTO (R_M32C_HI8, /* type */
167 0, /* rightshift */
168 1, /* size */
169 8, /* bitsize */
170 false, /* pc_relative */
171 0, /* bitpos */
172 complain_overflow_dont, /* complain_on_overflow */
173 bfd_elf_generic_reloc, /* special_function */
174 "R_M32C_HI8", /* name */
175 false, /* partial_inplace */
176 0, /* src_mask */
177 0xff, /* dst_mask */
178 false), /* pcrel_offset */
179
180 HOWTO (R_M32C_HI16, /* type */
181 0, /* rightshift */
182 2, /* size */
183 16, /* bitsize */
184 false, /* pc_relative */
185 0, /* bitpos */
186 complain_overflow_dont, /* complain_on_overflow */
187 bfd_elf_generic_reloc, /* special_function */
188 "R_M32C_HI16", /* name */
189 false, /* partial_inplace */
190 0, /* src_mask */
191 0xffff, /* dst_mask */
192 false), /* pcrel_offset */
193
194 HOWTO (R_M32C_RL_JUMP, /* type */
195 0, /* rightshift */
196 0, /* size */
197 0, /* bitsize */
198 false, /* pc_relative */
199 0, /* bitpos */
200 complain_overflow_signed, /* complain_on_overflow */
201 bfd_elf_generic_reloc, /* special_function */
202 "R_M32C_RL_JUMP", /* name */
203 false, /* partial_inplace */
204 0, /* src_mask */
205 0, /* dst_mask */
206 false), /* pcrel_offset */
207
208 HOWTO (R_M32C_RL_1ADDR, /* type */
209 0, /* rightshift */
210 0, /* size */
211 0, /* bitsize */
212 false, /* pc_relative */
213 0, /* bitpos */
214 complain_overflow_signed, /* complain_on_overflow */
215 bfd_elf_generic_reloc, /* special_function */
216 "R_M32C_RL_1ADDR", /* name */
217 false, /* partial_inplace */
218 0, /* src_mask */
219 0, /* dst_mask */
220 false), /* pcrel_offset */
221
222 HOWTO (R_M32C_RL_2ADDR, /* type */
223 0, /* rightshift */
224 0, /* size */
225 0, /* bitsize */
226 false, /* pc_relative */
227 0, /* bitpos */
228 complain_overflow_signed, /* complain_on_overflow */
229 bfd_elf_generic_reloc, /* special_function */
230 "R_M32C_RL_2ADDR", /* name */
231 false, /* partial_inplace */
232 0, /* src_mask */
233 0, /* dst_mask */
234 false), /* pcrel_offset */
235
236 };
237
238 /* Map BFD reloc types to M32C ELF reloc types. */
239
240 struct m32c_reloc_map
241 {
242 bfd_reloc_code_real_type bfd_reloc_val;
243 unsigned int m32c_reloc_val;
244 };
245
246 static const struct m32c_reloc_map m32c_reloc_map [] =
247 {
248 { BFD_RELOC_NONE, R_M32C_NONE },
249 { BFD_RELOC_16, R_M32C_16 },
250 { BFD_RELOC_24, R_M32C_24 },
251 { BFD_RELOC_32, R_M32C_32 },
252 { BFD_RELOC_8_PCREL, R_M32C_8_PCREL },
253 { BFD_RELOC_16_PCREL, R_M32C_16_PCREL },
254 { BFD_RELOC_8, R_M32C_8 },
255 { BFD_RELOC_LO16, R_M32C_LO16 },
256 { BFD_RELOC_HI16, R_M32C_HI16 },
257 { BFD_RELOC_M32C_HI8, R_M32C_HI8 },
258 { BFD_RELOC_M32C_RL_JUMP, R_M32C_RL_JUMP },
259 { BFD_RELOC_M32C_RL_1ADDR, R_M32C_RL_1ADDR },
260 { BFD_RELOC_M32C_RL_2ADDR, R_M32C_RL_2ADDR }
261 };
262
263 static reloc_howto_type *
m32c_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)264 m32c_reloc_type_lookup
265 (bfd * abfd ATTRIBUTE_UNUSED,
266 bfd_reloc_code_real_type code)
267 {
268 unsigned int i;
269
270 for (i = ARRAY_SIZE (m32c_reloc_map); i--;)
271 if (m32c_reloc_map [i].bfd_reloc_val == code)
272 return & m32c_elf_howto_table [m32c_reloc_map[i].m32c_reloc_val];
273
274 return NULL;
275 }
276
277 static reloc_howto_type *
m32c_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)278 m32c_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
279 {
280 unsigned int i;
281
282 for (i = 0;
283 i < sizeof (m32c_elf_howto_table) / sizeof (m32c_elf_howto_table[0]);
284 i++)
285 if (m32c_elf_howto_table[i].name != NULL
286 && strcasecmp (m32c_elf_howto_table[i].name, r_name) == 0)
287 return &m32c_elf_howto_table[i];
288
289 return NULL;
290 }
291
292 /* Set the howto pointer for an M32C ELF reloc. */
293
294 static bool
m32c_info_to_howto_rela(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)295 m32c_info_to_howto_rela (bfd * abfd,
296 arelent * cache_ptr,
297 Elf_Internal_Rela * dst)
298 {
299 unsigned int r_type;
300
301 r_type = ELF32_R_TYPE (dst->r_info);
302 if (r_type >= (unsigned int) R_M32C_max)
303 {
304 /* xgettext:c-format */
305 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
306 abfd, r_type);
307 bfd_set_error (bfd_error_bad_value);
308 return false;
309 }
310 cache_ptr->howto = & m32c_elf_howto_table [r_type];
311 return true;
312 }
313
314
315
316 /* Apply R_M32C_24 relocations. We have to do this because it's not a
317 power-of-two size, and the generic code may think it overruns the
318 section if it's right at the end.
319
320 Must return something other than bfd_reloc_continue to avoid the
321 above problem. Typical return values include bfd_reloc_ok or
322 bfd_reloc_overflow.
323 */
324
m32c_apply_reloc_24(bfd * abfd ATTRIBUTE_UNUSED,arelent * reloc_entry,asymbol * symbol,void * vdata_start ATTRIBUTE_UNUSED,asection * input_section,bfd * ibfd ATTRIBUTE_UNUSED,char ** error_msg ATTRIBUTE_UNUSED)325 static bfd_reloc_status_type m32c_apply_reloc_24 (bfd *abfd ATTRIBUTE_UNUSED,
326 arelent *reloc_entry,
327 asymbol *symbol,
328 void *vdata_start ATTRIBUTE_UNUSED,
329 asection *input_section,
330 bfd *ibfd ATTRIBUTE_UNUSED,
331 char **error_msg ATTRIBUTE_UNUSED)
332 {
333 bfd_vma relocation;
334 bfd_reloc_status_type s;
335
336 s = bfd_elf_generic_reloc (abfd, reloc_entry, symbol,
337 vdata_start,
338 input_section, ibfd, error_msg);
339 if (s != bfd_reloc_continue)
340 return s;
341
342 /* Get symbol value. (Common symbols are special.) */
343 if (bfd_is_com_section (symbol->section))
344 relocation = 0;
345 else
346 relocation = symbol->value;
347
348 relocation += symbol->section->output_offset;
349
350 /* Add in supplied addend. */
351 relocation += reloc_entry->addend;
352
353 reloc_entry->addend = relocation;
354 reloc_entry->address += input_section->output_offset;
355 return bfd_reloc_ok;
356 }
357
358 /* Relocate an M32C ELF section.
359 There is some attempt to make this function usable for many architectures,
360 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
361 if only to serve as a learning tool.
362
363 The RELOCATE_SECTION function is called by the new ELF backend linker
364 to handle the relocations for a section.
365
366 The relocs are always passed as Rela structures; if the section
367 actually uses Rel structures, the r_addend field will always be
368 zero.
369
370 This function is responsible for adjusting the section contents as
371 necessary, and (if using Rela relocs and generating a relocatable
372 output file) adjusting the reloc addend as necessary.
373
374 This function does not have to worry about setting the reloc
375 address or the reloc symbol index.
376
377 LOCAL_SYMS is a pointer to the swapped in local symbols.
378
379 LOCAL_SECTIONS is an array giving the section in the input file
380 corresponding to the st_shndx field of each local symbol.
381
382 The global hash table entry for the global symbols can be found
383 via elf_sym_hashes (input_bfd).
384
385 When generating relocatable output, this function must handle
386 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
387 going to be the section symbol corresponding to the output
388 section, which means that the addend must be adjusted
389 accordingly. */
390
391 static int
m32c_elf_relocate_section(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info,bfd * input_bfd,asection * input_section,bfd_byte * contents,Elf_Internal_Rela * relocs,Elf_Internal_Sym * local_syms,asection ** local_sections)392 m32c_elf_relocate_section
393 (bfd * output_bfd ATTRIBUTE_UNUSED,
394 struct bfd_link_info * info,
395 bfd * input_bfd,
396 asection * input_section,
397 bfd_byte * contents,
398 Elf_Internal_Rela * relocs,
399 Elf_Internal_Sym * local_syms,
400 asection ** local_sections)
401 {
402 Elf_Internal_Shdr * symtab_hdr;
403 struct elf_link_hash_entry ** sym_hashes;
404 Elf_Internal_Rela * rel;
405 Elf_Internal_Rela * relend;
406 asection *splt;
407
408 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
409 sym_hashes = elf_sym_hashes (input_bfd);
410 relend = relocs + input_section->reloc_count;
411
412 splt = elf_hash_table (info)->splt;
413
414 for (rel = relocs; rel < relend; rel ++)
415 {
416 reloc_howto_type * howto;
417 unsigned long r_symndx;
418 Elf_Internal_Sym * sym;
419 asection * sec;
420 struct elf_link_hash_entry * h;
421 bfd_vma relocation;
422 bfd_reloc_status_type r;
423 const char * name = NULL;
424 int r_type;
425
426 r_type = ELF32_R_TYPE (rel->r_info);
427
428 /* These are only used for relaxing; we don't actually relocate
429 anything with them, so skip them. */
430 if (r_type == R_M32C_RL_JUMP
431 || r_type == R_M32C_RL_1ADDR
432 || r_type == R_M32C_RL_2ADDR)
433 continue;
434
435 r_symndx = ELF32_R_SYM (rel->r_info);
436
437 howto = m32c_elf_howto_table + ELF32_R_TYPE (rel->r_info);
438 h = NULL;
439 sym = NULL;
440 sec = NULL;
441 relocation = 0;
442
443 if (r_symndx < symtab_hdr->sh_info)
444 {
445 sym = local_syms + r_symndx;
446 sec = local_sections [r_symndx];
447 relocation = (sec->output_section->vma
448 + sec->output_offset
449 + sym->st_value);
450
451 name = bfd_elf_string_from_elf_section
452 (input_bfd, symtab_hdr->sh_link, sym->st_name);
453 name = sym->st_name == 0 ? bfd_section_name (sec) : name;
454 }
455 else
456 {
457 h = sym_hashes [r_symndx - symtab_hdr->sh_info];
458
459 if (info->wrap_hash != NULL
460 && (input_section->flags & SEC_DEBUGGING) != 0)
461 h = ((struct elf_link_hash_entry *)
462 unwrap_hash_lookup (info, input_bfd, &h->root));
463
464 while (h->root.type == bfd_link_hash_indirect
465 || h->root.type == bfd_link_hash_warning)
466 h = (struct elf_link_hash_entry *) h->root.u.i.link;
467
468 name = h->root.root.string;
469
470 if (h->root.type == bfd_link_hash_defined
471 || h->root.type == bfd_link_hash_defweak)
472 {
473 sec = h->root.u.def.section;
474 relocation = (h->root.u.def.value
475 + sec->output_section->vma
476 + sec->output_offset);
477 }
478 else if (h->root.type == bfd_link_hash_undefweak)
479 ;
480 else if (!bfd_link_relocatable (info))
481 (*info->callbacks->undefined_symbol) (info, h->root.root.string,
482 input_bfd, input_section,
483 rel->r_offset, true);
484 }
485
486 if (sec != NULL && discarded_section (sec))
487 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
488 rel, 1, relend, howto, 0, contents);
489
490 if (bfd_link_relocatable (info))
491 {
492 /* This is a relocatable link. We don't have to change
493 anything, unless the reloc is against a section symbol,
494 in which case we have to adjust according to where the
495 section symbol winds up in the output section. */
496 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
497 rel->r_addend += sec->output_offset;
498 continue;
499 }
500
501 switch (ELF32_R_TYPE (rel->r_info))
502 {
503 case R_M32C_16:
504 {
505 bfd_vma *plt_offset;
506
507 if (h != NULL)
508 plt_offset = &h->plt.offset;
509 else
510 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
511
512 /* printf("%s: rel %x plt %d\n", h ? h->root.root.string : "(none)",
513 relocation, *plt_offset);*/
514 if (relocation <= 0xffff)
515 {
516 /* If the symbol is in range for a 16-bit address, we should
517 have deallocated the plt entry in relax_section. */
518 BFD_ASSERT (*plt_offset == (bfd_vma) -1);
519 }
520 else
521 {
522 /* If the symbol is out of range for a 16-bit address,
523 we must have allocated a plt entry. */
524 BFD_ASSERT (*plt_offset != (bfd_vma) -1);
525
526 /* If this is the first time we've processed this symbol,
527 fill in the plt entry with the correct symbol address. */
528 if ((*plt_offset & 1) == 0)
529 {
530 unsigned int x;
531
532 x = 0x000000fc; /* jmpf */
533 x |= (relocation << 8) & 0xffffff00;
534 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
535 *plt_offset |= 1;
536 }
537
538 relocation = (splt->output_section->vma
539 + splt->output_offset
540 + (*plt_offset & -2));
541 if (name)
542 {
543 char *newname = bfd_malloc (strlen(name)+5);
544 strcpy (newname, name);
545 strcat(newname, ".plt");
546 _bfd_generic_link_add_one_symbol (info,
547 input_bfd,
548 newname,
549 BSF_FUNCTION | BSF_WEAK,
550 splt,
551 (*plt_offset & -2),
552 0,
553 1,
554 0,
555 0);
556 }
557 }
558 }
559 break;
560
561 case R_M32C_HI8:
562 case R_M32C_HI16:
563 relocation >>= 16;
564 break;
565 }
566
567 #if 0
568 printf ("relocate %s at %06lx relocation %06lx addend %ld ",
569 m32c_elf_howto_table[ELF32_R_TYPE(rel->r_info)].name,
570 rel->r_offset + input_section->output_section->vma + input_section->output_offset,
571 relocation, rel->r_addend);
572 {
573 int i;
574 for (i=0; i<4; i++)
575 printf (" %02x", contents[rel->r_offset+i]);
576 printf ("\n");
577 }
578 #endif
579 switch (ELF32_R_TYPE(rel->r_info))
580 {
581 case R_M32C_24:
582 /* Like m32c_apply_reloc_24, we must handle this one separately. */
583 relocation += rel->r_addend;
584
585 /* Sanity check the address. */
586 if (rel->r_offset + 3
587 > bfd_get_section_limit_octets (input_bfd, input_section))
588 r = bfd_reloc_outofrange;
589 else
590 {
591 bfd_put_8 (input_bfd, relocation & 0xff, contents + rel->r_offset);
592 bfd_put_8 (input_bfd, (relocation >> 8) & 0xff, contents + rel->r_offset + 1);
593 bfd_put_8 (input_bfd, (relocation >> 16) & 0xff, contents + rel->r_offset + 2);
594 r = bfd_reloc_ok;
595 }
596
597 break;
598
599 default:
600 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
601 contents, rel->r_offset, relocation,
602 rel->r_addend);
603 break;
604 }
605
606 if (r != bfd_reloc_ok)
607 {
608 const char * msg = (const char *) NULL;
609
610 switch (r)
611 {
612 case bfd_reloc_overflow:
613 (*info->callbacks->reloc_overflow)
614 (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0,
615 input_bfd, input_section, rel->r_offset);
616 break;
617
618 case bfd_reloc_undefined:
619 (*info->callbacks->undefined_symbol)
620 (info, name, input_bfd, input_section, rel->r_offset, true);
621 break;
622
623 case bfd_reloc_outofrange:
624 msg = _("internal error: out of range error");
625 break;
626
627 case bfd_reloc_notsupported:
628 msg = _("internal error: unsupported relocation error");
629 break;
630
631 case bfd_reloc_dangerous:
632 msg = _("internal error: dangerous relocation");
633 break;
634
635 default:
636 msg = _("internal error: unknown error");
637 break;
638 }
639
640 if (msg)
641 (*info->callbacks->warning) (info, msg, name, input_bfd,
642 input_section, rel->r_offset);
643 }
644 }
645
646 return true;
647 }
648
649 /* We support 16-bit pointers to code above 64k by generating a thunk
650 below 64k containing a JMP instruction to the final address. */
651
652 static bool
m32c_elf_check_relocs(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)653 m32c_elf_check_relocs
654 (bfd * abfd,
655 struct bfd_link_info * info,
656 asection * sec,
657 const Elf_Internal_Rela * relocs)
658 {
659 Elf_Internal_Shdr * symtab_hdr;
660 struct elf_link_hash_entry ** sym_hashes;
661 const Elf_Internal_Rela * rel;
662 const Elf_Internal_Rela * rel_end;
663 bfd_vma *local_plt_offsets;
664 asection *splt;
665 bfd *dynobj;
666
667 if (bfd_link_relocatable (info))
668 return true;
669
670 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
671 sym_hashes = elf_sym_hashes (abfd);
672 local_plt_offsets = elf_local_got_offsets (abfd);
673 splt = NULL;
674 dynobj = elf_hash_table(info)->dynobj;
675
676 rel_end = relocs + sec->reloc_count;
677 for (rel = relocs; rel < rel_end; rel++)
678 {
679 struct elf_link_hash_entry *h;
680 unsigned long r_symndx;
681 bfd_vma *offset;
682
683 r_symndx = ELF32_R_SYM (rel->r_info);
684 if (r_symndx < symtab_hdr->sh_info)
685 h = NULL;
686 else
687 {
688 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
689 while (h->root.type == bfd_link_hash_indirect
690 || h->root.type == bfd_link_hash_warning)
691 h = (struct elf_link_hash_entry *) h->root.u.i.link;
692 }
693
694 switch (ELF32_R_TYPE (rel->r_info))
695 {
696 /* This relocation describes a 16-bit pointer to a function.
697 We may need to allocate a thunk in low memory; reserve memory
698 for it now. */
699 case R_M32C_16:
700 if (dynobj == NULL)
701 elf_hash_table (info)->dynobj = dynobj = abfd;
702 splt = elf_hash_table (info)->splt;
703 if (splt == NULL)
704 {
705 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
706 | SEC_IN_MEMORY | SEC_LINKER_CREATED
707 | SEC_READONLY | SEC_CODE);
708 splt = bfd_make_section_anyway_with_flags (dynobj, ".plt",
709 flags);
710 elf_hash_table (info)->splt = splt;
711 if (splt == NULL
712 || !bfd_set_section_alignment (splt, 1))
713 return false;
714 }
715
716 if (h != NULL)
717 offset = &h->plt.offset;
718 else
719 {
720 if (local_plt_offsets == NULL)
721 {
722 size_t size;
723 unsigned int i;
724
725 size = symtab_hdr->sh_info * sizeof (bfd_vma);
726 local_plt_offsets = (bfd_vma *) bfd_alloc (abfd, size);
727 if (local_plt_offsets == NULL)
728 return false;
729 elf_local_got_offsets (abfd) = local_plt_offsets;
730
731 for (i = 0; i < symtab_hdr->sh_info; i++)
732 local_plt_offsets[i] = (bfd_vma) -1;
733 }
734 offset = &local_plt_offsets[r_symndx];
735 }
736
737 if (*offset == (bfd_vma) -1)
738 {
739 *offset = splt->size;
740 splt->size += 4;
741 }
742 break;
743 }
744 }
745
746 return true;
747 }
748
749 /* This must exist if dynobj is ever set. */
750
751 static bool
m32c_elf_finish_dynamic_sections(bfd * abfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)752 m32c_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED,
753 struct bfd_link_info *info)
754 {
755 bfd *dynobj = elf_hash_table (info)->dynobj;
756 asection *splt = elf_hash_table (info)->splt;
757
758 /* As an extra sanity check, verify that all plt entries have
759 been filled in. */
760
761 if (dynobj != NULL && splt != NULL)
762 {
763 bfd_byte *contents = splt->contents;
764 unsigned int i, size = splt->size;
765 for (i = 0; i < size; i += 4)
766 {
767 unsigned int x = bfd_get_32 (dynobj, contents + i);
768 BFD_ASSERT (x != 0);
769 }
770 }
771
772 return true;
773 }
774
775 static bool
m32c_elf_always_size_sections(bfd * output_bfd ATTRIBUTE_UNUSED,struct bfd_link_info * info)776 m32c_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
777 struct bfd_link_info *info)
778 {
779 bfd *dynobj;
780 asection *splt;
781
782 if (bfd_link_relocatable (info))
783 return true;
784
785 dynobj = elf_hash_table (info)->dynobj;
786 if (dynobj == NULL)
787 return true;
788
789 splt = elf_hash_table (info)->splt;
790 BFD_ASSERT (splt != NULL);
791
792 splt->contents = (bfd_byte *) bfd_zalloc (dynobj, splt->size);
793 if (splt->contents == NULL)
794 return false;
795
796 return true;
797 }
798
799 /* Function to set the ELF flag bits. */
800
801 static bool
m32c_elf_set_private_flags(bfd * abfd,flagword flags)802 m32c_elf_set_private_flags (bfd *abfd, flagword flags)
803 {
804 elf_elfheader (abfd)->e_flags = flags;
805 elf_flags_init (abfd) = true;
806 return true;
807 }
808
809 /* Merge backend specific data from an object file to the output
810 object file when linking. */
811
812 static bool
m32c_elf_merge_private_bfd_data(bfd * ibfd,struct bfd_link_info * info)813 m32c_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
814 {
815 bfd *obfd = info->output_bfd;
816 flagword old_flags, old_partial;
817 flagword new_flags, new_partial;
818 bool error = false;
819 char new_opt[80];
820 char old_opt[80];
821
822 new_opt[0] = old_opt[0] = '\0';
823 new_flags = elf_elfheader (ibfd)->e_flags;
824 old_flags = elf_elfheader (obfd)->e_flags;
825
826 #ifdef DEBUG
827 _bfd_error_handler
828 ("old_flags = 0x%.8x, new_flags = 0x%.8x, init = %s, filename = %s",
829 old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no",
830 bfd_get_filename (ibfd));
831 #endif
832
833 if (!elf_flags_init (obfd))
834 {
835 /* First call, no flags set. */
836 elf_flags_init (obfd) = true;
837 elf_elfheader (obfd)->e_flags = new_flags;
838 }
839
840 else if (new_flags == old_flags)
841 /* Compatible flags are ok. */
842 ;
843
844 else /* Possibly incompatible flags. */
845 {
846 /* Warn if different cpu is used (allow a specific cpu to override
847 the generic cpu). */
848 new_partial = (new_flags & EF_M32C_CPU_MASK);
849 old_partial = (old_flags & EF_M32C_CPU_MASK);
850 if (new_partial == old_partial)
851 ;
852
853 else
854 {
855 switch (new_partial)
856 {
857 default: strcat (new_opt, " -m16c"); break;
858 case EF_M32C_CPU_M16C: strcat (new_opt, " -m16c"); break;
859 case EF_M32C_CPU_M32C: strcat (new_opt, " -m32c"); break;
860 }
861
862 switch (old_partial)
863 {
864 default: strcat (old_opt, " -m16c"); break;
865 case EF_M32C_CPU_M16C: strcat (old_opt, " -m16c"); break;
866 case EF_M32C_CPU_M32C: strcat (old_opt, " -m32c"); break;
867 }
868 }
869
870 /* Print out any mismatches from above. */
871 if (new_opt[0])
872 {
873 error = true;
874 _bfd_error_handler
875 /* xgettext:c-format */
876 (_("%pB: compiled with %s and linked with modules compiled with %s"),
877 ibfd, new_opt, old_opt);
878 }
879
880 new_flags &= ~ EF_M32C_ALL_FLAGS;
881 old_flags &= ~ EF_M32C_ALL_FLAGS;
882
883 /* Warn about any other mismatches. */
884 if (new_flags != old_flags)
885 {
886 error = true;
887 _bfd_error_handler
888 /* xgettext:c-format */
889 (_("%pB: uses different e_flags (%#x) fields"
890 " than previous modules (%#x)"),
891 ibfd, new_flags, old_flags);
892 }
893 }
894
895 if (error)
896 bfd_set_error (bfd_error_bad_value);
897
898 return !error;
899 }
900
901
902 static bool
m32c_elf_print_private_bfd_data(bfd * abfd,void * ptr)903 m32c_elf_print_private_bfd_data (bfd *abfd, void *ptr)
904 {
905 FILE *file = (FILE *) ptr;
906 flagword flags;
907
908 BFD_ASSERT (abfd != NULL && ptr != NULL);
909
910 /* Print normal ELF private data. */
911 _bfd_elf_print_private_bfd_data (abfd, ptr);
912
913 flags = elf_elfheader (abfd)->e_flags;
914 fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags);
915
916 switch (flags & EF_M32C_CPU_MASK)
917 {
918 default: break;
919 case EF_M32C_CPU_M16C: fprintf (file, " -m16c"); break;
920 case EF_M32C_CPU_M32C: fprintf (file, " -m32c"); break;
921 }
922
923 fputc ('\n', file);
924 return true;
925 }
926
927 /* Return the MACH for an e_flags value. */
928
929 static int
elf32_m32c_machine(bfd * abfd)930 elf32_m32c_machine (bfd *abfd)
931 {
932 switch (elf_elfheader (abfd)->e_flags & EF_M32C_CPU_MASK)
933 {
934 case EF_M32C_CPU_M16C: return bfd_mach_m16c;
935 case EF_M32C_CPU_M32C: return bfd_mach_m32c;
936 }
937
938 return bfd_mach_m16c;
939 }
940
941 static bool
m32c_elf_object_p(bfd * abfd)942 m32c_elf_object_p (bfd *abfd)
943 {
944 bfd_default_set_arch_mach (abfd, bfd_arch_m32c,
945 elf32_m32c_machine (abfd));
946 return true;
947 }
948
949
950 #ifdef DEBUG
951 void
dump_symtab(bfd * abfd,void * internal_syms,void * external_syms)952 dump_symtab (bfd * abfd, void *internal_syms, void *external_syms)
953 {
954 size_t locsymcount;
955 Elf_Internal_Sym *isymbuf;
956 Elf_Internal_Sym *isymend;
957 Elf_Internal_Sym *isym;
958 Elf_Internal_Shdr *symtab_hdr;
959 bool free_internal = 0, free_external = 0;
960 char * st_info_str;
961 char * st_info_stb_str;
962 char * st_other_str;
963 char * st_shndx_str;
964
965 if (! internal_syms)
966 {
967 internal_syms = bfd_malloc (1000);
968 free_internal = 1;
969 }
970 if (! external_syms)
971 {
972 external_syms = bfd_malloc (1000);
973 free_external = 1;
974 }
975
976 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
977 locsymcount = symtab_hdr->sh_size / get_elf_backend_data(abfd)->s->sizeof_sym;
978 if (free_internal)
979 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
980 symtab_hdr->sh_info, 0,
981 internal_syms, external_syms, NULL);
982 else
983 isymbuf = internal_syms;
984 isymend = isymbuf + locsymcount;
985
986 for (isym = isymbuf ; isym < isymend ; isym++)
987 {
988 switch (ELF_ST_TYPE (isym->st_info))
989 {
990 case STT_FUNC:
991 st_info_str = "STT_FUNC";
992 break;
993
994 case STT_SECTION:
995 st_info_str = "STT_SECTION";
996 break;
997
998 case STT_FILE:
999 st_info_str = "STT_FILE";
1000 break;
1001
1002 case STT_OBJECT:
1003 st_info_str = "STT_OBJECT";
1004 break;
1005
1006 case STT_TLS:
1007 st_info_str = "STT_TLS";
1008 break;
1009
1010 default:
1011 st_info_str = "";
1012 }
1013
1014 switch (ELF_ST_BIND (isym->st_info))
1015 {
1016 case STB_LOCAL:
1017 st_info_stb_str = "STB_LOCAL";
1018 break;
1019
1020 case STB_GLOBAL:
1021 st_info_stb_str = "STB_GLOBAL";
1022 break;
1023
1024 default:
1025 st_info_stb_str = "";
1026 }
1027
1028 switch (ELF_ST_VISIBILITY (isym->st_other))
1029 {
1030 case STV_DEFAULT:
1031 st_other_str = "STV_DEFAULT";
1032 break;
1033
1034 case STV_INTERNAL:
1035 st_other_str = "STV_INTERNAL";
1036 break;
1037
1038 case STV_PROTECTED:
1039 st_other_str = "STV_PROTECTED";
1040 break;
1041
1042 default:
1043 st_other_str = "";
1044 }
1045
1046 switch (isym->st_shndx)
1047 {
1048 case SHN_ABS:
1049 st_shndx_str = "SHN_ABS";
1050 break;
1051
1052 case SHN_COMMON:
1053 st_shndx_str = "SHN_COMMON";
1054 break;
1055
1056 case SHN_UNDEF:
1057 st_shndx_str = "SHN_UNDEF";
1058 break;
1059
1060 default:
1061 st_shndx_str = "";
1062 }
1063
1064 printf ("isym = %p st_value = %lx st_size = %lx st_name = (%lu) %s "
1065 "st_info = (%d) %s %s st_other = (%d) %s st_shndx = (%d) %s\n",
1066 isym,
1067 (unsigned long) isym->st_value,
1068 (unsigned long) isym->st_size,
1069 isym->st_name,
1070 bfd_elf_string_from_elf_section (abfd, symtab_hdr->sh_link,
1071 isym->st_name),
1072 isym->st_info, st_info_str, st_info_stb_str,
1073 isym->st_other, st_other_str,
1074 isym->st_shndx, st_shndx_str);
1075 }
1076 if (free_internal)
1077 free (internal_syms);
1078 if (free_external)
1079 free (external_syms);
1080 }
1081
1082 char *
m32c_get_reloc(long reloc)1083 m32c_get_reloc (long reloc)
1084 {
1085 if (0 <= reloc && reloc < R_M32C_max)
1086 return m32c_elf_howto_table[reloc].name;
1087 else
1088 return "";
1089 }
1090 #endif /* DEBUG */
1091
1092 /* Handle relaxing. */
1093
1094 /* A subroutine of m32c_elf_relax_section. If the global symbol H
1095 is within the low 64k, remove any entry for it in the plt. */
1096
1097 struct relax_plt_data
1098 {
1099 asection *splt;
1100 bool *again;
1101 };
1102
1103 static bool
m32c_relax_plt_check(struct elf_link_hash_entry * h,void * xdata)1104 m32c_relax_plt_check (struct elf_link_hash_entry *h, void * xdata)
1105 {
1106 struct relax_plt_data *data = (struct relax_plt_data *) xdata;
1107
1108 if (h->plt.offset != (bfd_vma) -1)
1109 {
1110 bfd_vma address;
1111
1112 if (h->root.type == bfd_link_hash_undefined
1113 || h->root.type == bfd_link_hash_undefweak)
1114 address = 0;
1115 else
1116 address = (h->root.u.def.section->output_section->vma
1117 + h->root.u.def.section->output_offset
1118 + h->root.u.def.value);
1119
1120 if (address <= 0xffff)
1121 {
1122 h->plt.offset = -1;
1123 data->splt->size -= 4;
1124 *data->again = true;
1125 }
1126 }
1127
1128 return true;
1129 }
1130
1131 /* A subroutine of m32c_elf_relax_section. If the global symbol H
1132 previously had a plt entry, give it a new entry offset. */
1133
1134 static bool
m32c_relax_plt_realloc(struct elf_link_hash_entry * h,void * xdata)1135 m32c_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata)
1136 {
1137 bfd_vma *entry = (bfd_vma *) xdata;
1138
1139 if (h->plt.offset != (bfd_vma) -1)
1140 {
1141 h->plt.offset = *entry;
1142 *entry += 4;
1143 }
1144
1145 return true;
1146 }
1147
1148 static bool
m32c_elf_relax_plt_section(asection * splt,struct bfd_link_info * info,bool * again)1149 m32c_elf_relax_plt_section (asection *splt,
1150 struct bfd_link_info *info,
1151 bool *again)
1152 {
1153 struct relax_plt_data relax_plt_data;
1154 bfd *ibfd;
1155
1156 /* Assume nothing changes. */
1157 *again = false;
1158
1159 if (bfd_link_relocatable (info))
1160 return true;
1161
1162 /* Quick check for an empty plt. */
1163 if (splt->size == 0)
1164 return true;
1165
1166 /* Map across all global symbols; see which ones happen to
1167 fall in the low 64k. */
1168 relax_plt_data.splt = splt;
1169 relax_plt_data.again = again;
1170 elf_link_hash_traverse (elf_hash_table (info), m32c_relax_plt_check,
1171 &relax_plt_data);
1172
1173 /* Likewise for local symbols, though that's somewhat less convenient
1174 as we have to walk the list of input bfds and swap in symbol data. */
1175 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link.next)
1176 {
1177 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
1178 Elf_Internal_Shdr *symtab_hdr;
1179 Elf_Internal_Sym *isymbuf = NULL;
1180 unsigned int idx;
1181
1182 if (! local_plt_offsets)
1183 continue;
1184
1185 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1186 if (symtab_hdr->sh_info != 0)
1187 {
1188 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1189 if (isymbuf == NULL)
1190 isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
1191 symtab_hdr->sh_info, 0,
1192 NULL, NULL, NULL);
1193 if (isymbuf == NULL)
1194 return false;
1195 }
1196
1197 for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
1198 {
1199 Elf_Internal_Sym *isym;
1200 asection *tsec;
1201 bfd_vma address;
1202
1203 if (local_plt_offsets[idx] == (bfd_vma) -1)
1204 continue;
1205
1206 isym = &isymbuf[idx];
1207 if (isym->st_shndx == SHN_UNDEF)
1208 continue;
1209 else if (isym->st_shndx == SHN_ABS)
1210 tsec = bfd_abs_section_ptr;
1211 else if (isym->st_shndx == SHN_COMMON)
1212 tsec = bfd_com_section_ptr;
1213 else
1214 tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
1215
1216 address = (tsec->output_section->vma
1217 + tsec->output_offset
1218 + isym->st_value);
1219 if (address <= 0xffff)
1220 {
1221 local_plt_offsets[idx] = -1;
1222 splt->size -= 4;
1223 *again = true;
1224 }
1225 }
1226
1227 if (isymbuf != NULL
1228 && symtab_hdr->contents != (unsigned char *) isymbuf)
1229 {
1230 if (! info->keep_memory)
1231 free (isymbuf);
1232 else
1233 {
1234 /* Cache the symbols for elf_link_input_bfd. */
1235 symtab_hdr->contents = (unsigned char *) isymbuf;
1236 }
1237 }
1238 }
1239
1240 /* If we changed anything, walk the symbols again to reallocate
1241 .plt entry addresses. */
1242 if (*again && splt->size > 0)
1243 {
1244 bfd_vma entry = 0;
1245
1246 elf_link_hash_traverse (elf_hash_table (info),
1247 m32c_relax_plt_realloc, &entry);
1248
1249 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link.next)
1250 {
1251 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
1252 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
1253 unsigned int idx;
1254
1255 if (! local_plt_offsets)
1256 continue;
1257
1258 for (idx = 0; idx < nlocals; ++idx)
1259 if (local_plt_offsets[idx] != (bfd_vma) -1)
1260 {
1261 local_plt_offsets[idx] = entry;
1262 entry += 4;
1263 }
1264 }
1265 }
1266
1267 return true;
1268 }
1269
1270 static int
compare_reloc(const void * e1,const void * e2)1271 compare_reloc (const void *e1, const void *e2)
1272 {
1273 const Elf_Internal_Rela *i1 = (const Elf_Internal_Rela *) e1;
1274 const Elf_Internal_Rela *i2 = (const Elf_Internal_Rela *) e2;
1275
1276 if (i1->r_offset == i2->r_offset)
1277 return 0;
1278 else
1279 return i1->r_offset < i2->r_offset ? -1 : 1;
1280 }
1281
1282 #define OFFSET_FOR_RELOC(rel) m32c_offset_for_reloc (abfd, rel, symtab_hdr, shndx_buf, intsyms)
1283 static bfd_vma
m32c_offset_for_reloc(bfd * abfd,Elf_Internal_Rela * rel,Elf_Internal_Shdr * symtab_hdr,bfd_byte * shndx_buf ATTRIBUTE_UNUSED,Elf_Internal_Sym * intsyms)1284 m32c_offset_for_reloc (bfd *abfd,
1285 Elf_Internal_Rela *rel,
1286 Elf_Internal_Shdr *symtab_hdr,
1287 bfd_byte *shndx_buf ATTRIBUTE_UNUSED,
1288 Elf_Internal_Sym *intsyms)
1289 {
1290 bfd_vma symval;
1291
1292 /* Get the value of the symbol referred to by the reloc. */
1293 if (ELF32_R_SYM (rel->r_info) < symtab_hdr->sh_info)
1294 {
1295 /* A local symbol. */
1296 Elf_Internal_Sym *isym;
1297 asection *ssec;
1298
1299 isym = intsyms + ELF32_R_SYM (rel->r_info);
1300 ssec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1301 symval = isym->st_value;
1302 if (ssec)
1303 symval += ssec->output_section->vma
1304 + ssec->output_offset;
1305 }
1306 else
1307 {
1308 unsigned long indx;
1309 struct elf_link_hash_entry *h;
1310
1311 /* An external symbol. */
1312 indx = ELF32_R_SYM (rel->r_info) - symtab_hdr->sh_info;
1313 h = elf_sym_hashes (abfd)[indx];
1314 BFD_ASSERT (h != NULL);
1315
1316 if (h->root.type != bfd_link_hash_defined
1317 && h->root.type != bfd_link_hash_defweak)
1318 /* This appears to be a reference to an undefined
1319 symbol. Just ignore it--it will be caught by the
1320 regular reloc processing. */
1321 return 0;
1322
1323 symval = (h->root.u.def.value
1324 + h->root.u.def.section->output_section->vma
1325 + h->root.u.def.section->output_offset);
1326 }
1327 return symval;
1328 }
1329
1330 static int bytes_saved = 0;
1331
1332 static int bytes_to_reloc[] = {
1333 R_M32C_NONE,
1334 R_M32C_8,
1335 R_M32C_16,
1336 R_M32C_24,
1337 R_M32C_32
1338 };
1339
1340 /* What we use the bits in a relax reloc addend (R_M32C_RL_*) for. */
1341
1342 /* Mask for the number of relocs associated with this insn. */
1343 #define RLA_RELOCS 0x0000000f
1344 /* Number of bytes gas emitted (before gas's relaxing) */
1345 #define RLA_NBYTES 0x00000ff0
1346
1347 /* If the displacement is within the given range and the new encoding
1348 differs from the old encoding (the index), then the insn can be
1349 relaxed to the new encoding. */
1350 typedef const struct {
1351 int bytes;
1352 unsigned int max_disp;
1353 unsigned char new_encoding;
1354 } EncodingTable;
1355
1356 static EncodingTable m16c_addr_encodings[] = {
1357 { 0, 0, 0 }, /* R0 */
1358 { 0, 0, 1 }, /* R1 */
1359 { 0, 0, 2 }, /* R2 */
1360 { 0, 0, 3 }, /* R3 */
1361 { 0, 0, 4 }, /* A0 */
1362 { 0, 0, 5 }, /* A1 */
1363 { 0, 0, 6 }, /* [A0] */
1364 { 0, 0, 7 }, /* [A1] */
1365 { 1, 0, 6 }, /* udsp:8[A0] */
1366 { 1, 0, 7 }, /* udsp:8[A1] */
1367 { 1, 0, 10 }, /* udsp:8[SB] */
1368 { 1, 0, 11 }, /* sdsp:8[FB] */
1369 { 2, 255, 8 }, /* udsp:16[A0] */
1370 { 2, 255, 9 }, /* udsp:16[A1] */
1371 { 2, 255, 10 }, /* udsp:16[SB] */
1372 { 2, 0, 15 }, /* abs:16 */
1373 };
1374
1375 static EncodingTable m16c_jmpaddr_encodings[] = {
1376 { 0, 0, 0 }, /* R0 */
1377 { 0, 0, 1 }, /* R1 */
1378 { 0, 0, 2 }, /* R2 */
1379 { 0, 0, 3 }, /* R3 */
1380 { 0, 0, 4 }, /* A0 */
1381 { 0, 0, 5 }, /* A1 */
1382 { 0, 0, 6 }, /* [A0] */
1383 { 0, 0, 7 }, /* [A1] */
1384 { 1, 0, 6 }, /* udsp:8[A0] */
1385 { 1, 0, 7 }, /* udsp:8[A1] */
1386 { 1, 0, 10 }, /* udsp:8[SB] */
1387 { 1, 0, 11 }, /* sdsp:8[FB] */
1388 { 3, 255, 8 }, /* udsp:20[A0] */
1389 { 3, 255, 9 }, /* udsp:20[A1] */
1390 { 2, 255, 10 }, /* udsp:16[SB] */
1391 { 2, 0, 15 }, /* abs:16 */
1392 };
1393
1394 static EncodingTable m32c_addr_encodings[] = {
1395 { 0, 0, 0 }, /* [A0] */
1396 { 0, 0, 1 }, /* [A1] */
1397 { 0, 0, 2 }, /* A0 */
1398 { 0, 0, 3 }, /* A1 */
1399 { 1, 0, 0 }, /* udsp:8[A0] */
1400 { 1, 0, 1 }, /* udsp:8[A1] */
1401 { 1, 0, 6 }, /* udsp:8[SB] */
1402 { 1, 0, 7 }, /* sdsp:8[FB] */
1403 { 2, 255, 4 }, /* udsp:16[A0] */
1404 { 2, 255, 5 }, /* udsp:16[A1] */
1405 { 2, 255, 6 }, /* udsp:16[SB] */
1406 { 2, 127, 7 }, /* sdsp:16[FB] */
1407 { 3, 65535, 8 }, /* udsp:24[A0] */
1408 { 3, 65535, 9 }, /* udsp:24[A1] */
1409 { 3, 65535, 15 }, /* abs24 */
1410 { 2, 0, 15 }, /* abs16 */
1411 { 0, 0, 16 }, /* R2 */
1412 { 0, 0, 17 }, /* R3 */
1413 { 0, 0, 18 }, /* R0 */
1414 { 0, 0, 19 }, /* R1 */
1415 { 0, 0, 20 }, /* */
1416 { 0, 0, 21 }, /* */
1417 { 0, 0, 22 }, /* */
1418 { 0, 0, 23 }, /* */
1419 { 0, 0, 24 }, /* */
1420 { 0, 0, 25 }, /* */
1421 { 0, 0, 26 }, /* */
1422 { 0, 0, 27 }, /* */
1423 { 0, 0, 28 }, /* */
1424 { 0, 0, 29 }, /* */
1425 { 0, 0, 30 }, /* */
1426 { 0, 0, 31 }, /* */
1427 };
1428
1429 static bool
m32c_elf_relax_section(bfd * abfd,asection * sec,struct bfd_link_info * link_info,bool * again)1430 m32c_elf_relax_section (bfd *abfd,
1431 asection *sec,
1432 struct bfd_link_info *link_info,
1433 bool *again)
1434 {
1435 Elf_Internal_Shdr *symtab_hdr;
1436 Elf_Internal_Shdr *shndx_hdr;
1437 Elf_Internal_Rela *internal_relocs;
1438 Elf_Internal_Rela *free_relocs = NULL;
1439 Elf_Internal_Rela *irel, *irelend, *srel;
1440 bfd_byte * contents = NULL;
1441 bfd_byte * free_contents = NULL;
1442 Elf_Internal_Sym *intsyms = NULL;
1443 Elf_Internal_Sym *free_intsyms = NULL;
1444 bfd_byte *shndx_buf = NULL;
1445 int machine;
1446
1447 if (is_elf_hash_table (link_info->hash)
1448 && abfd == elf_hash_table (link_info)->dynobj
1449 && (sec->flags & SEC_LINKER_CREATED) != 0
1450 && strcmp (sec->name, ".plt") == 0)
1451 return m32c_elf_relax_plt_section (sec, link_info, again);
1452
1453 /* Assume nothing changes. */
1454 *again = false;
1455
1456 machine = elf32_m32c_machine (abfd);
1457
1458 /* We don't have to do anything for a relocatable link, if
1459 this section does not have relocs, or if this is not a
1460 code section. */
1461 if (bfd_link_relocatable (link_info)
1462 || sec->reloc_count == 0
1463 || (sec->flags & SEC_RELOC) == 0
1464 || (sec->flags & SEC_HAS_CONTENTS) == 0
1465 || (sec->flags & SEC_CODE) == 0)
1466 return true;
1467
1468 symtab_hdr = & elf_symtab_hdr (abfd);
1469 if (elf_symtab_shndx_list (abfd))
1470 shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
1471 else
1472 shndx_hdr = NULL;
1473
1474 /* Get the section contents. */
1475 if (elf_section_data (sec)->this_hdr.contents != NULL)
1476 contents = elf_section_data (sec)->this_hdr.contents;
1477 /* Go get them off disk. */
1478 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1479 goto error_return;
1480
1481 /* Read this BFD's symbols. */
1482 /* Get cached copy if it exists. */
1483 if (symtab_hdr->contents != NULL)
1484 {
1485 intsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
1486 }
1487 else
1488 {
1489 intsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL);
1490 symtab_hdr->contents = (bfd_byte *) intsyms;
1491 }
1492
1493 if (shndx_hdr && shndx_hdr->sh_size != 0)
1494 {
1495 size_t amt;
1496
1497 if (_bfd_mul_overflow (symtab_hdr->sh_info,
1498 sizeof (Elf_External_Sym_Shndx), &amt))
1499 {
1500 bfd_set_error (bfd_error_file_too_big);
1501 goto error_return;
1502 }
1503 if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0)
1504 goto error_return;
1505 shndx_buf = _bfd_malloc_and_read (abfd, amt, amt);
1506 if (shndx_buf == NULL)
1507 goto error_return;
1508 shndx_hdr->contents = shndx_buf;
1509 }
1510
1511 /* Get a copy of the native relocations. */
1512 internal_relocs = (_bfd_elf_link_read_relocs
1513 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
1514 link_info->keep_memory));
1515 if (internal_relocs == NULL)
1516 goto error_return;
1517 if (! link_info->keep_memory)
1518 free_relocs = internal_relocs;
1519
1520 /* The RL_ relocs must be just before the operand relocs they go
1521 with, so we must sort them to guarantee this. */
1522 qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
1523 compare_reloc);
1524
1525 /* Walk through them looking for relaxing opportunities. */
1526 irelend = internal_relocs + sec->reloc_count;
1527
1528 for (irel = internal_relocs; irel < irelend; irel++)
1529 {
1530 bfd_vma symval;
1531 unsigned char *insn, *gap, *einsn;
1532 bfd_vma pc;
1533 bfd_signed_vma pcrel;
1534 int relax_relocs;
1535 int gap_size;
1536 int new_type;
1537 int posn;
1538 int enc;
1539 EncodingTable *enctbl;
1540 EncodingTable *e;
1541
1542 if (ELF32_R_TYPE(irel->r_info) != R_M32C_RL_JUMP
1543 && ELF32_R_TYPE(irel->r_info) != R_M32C_RL_1ADDR
1544 && ELF32_R_TYPE(irel->r_info) != R_M32C_RL_2ADDR)
1545 continue;
1546
1547 srel = irel;
1548
1549 /* There will always be room for the relaxed insn, since it is smaller
1550 than the one it would replace. */
1551 BFD_ASSERT (irel->r_offset < sec->size);
1552
1553 insn = contents + irel->r_offset;
1554 relax_relocs = irel->r_addend % 16;
1555
1556 /* Ok, we only have three relocs we care about, and they're all
1557 fake. The lower four bits of the addend is always the number
1558 of following relocs (hence the qsort above) that are assigned
1559 to this opcode. The next 8 bits of the addend indicates the
1560 number of bytes in the insn. We use the rest of them
1561 ourselves as flags for the more expensive operations (defines
1562 above). The three relocs are:
1563
1564 RL_JUMP: This marks all direct jump insns. We check the
1565 displacement and replace them with shorter jumps if
1566 they're in range. We also use this to find JMP.S
1567 insns and manually shorten them when we delete bytes.
1568 We have to decode these insns to figure out what to
1569 do.
1570
1571 RL_1ADDR: This is a :G or :Q insn, which has a single
1572 "standard" operand. We have to extract the type
1573 field, see if it's a wide displacement, then figure
1574 out if we can replace it with a narrow displacement.
1575 We don't have to decode these insns.
1576
1577 RL_2ADDR: Similarly, but two "standard" operands. Note that
1578 r_addend may still be 1, as standard operands don't
1579 always have displacements. Gas shouldn't give us one
1580 with zero operands, but since we don't know which one
1581 has the displacement, we check them both anyway.
1582
1583 These all point to the beginning of the insn itself, not the
1584 operands.
1585
1586 Note that we only relax one step at a time, relying on the
1587 linker to call us repeatedly. Thus, there is no code for
1588 JMP.A->JMP.B although that will happen in two steps.
1589 Likewise, for 2ADDR relaxes, we do one operand per cycle.
1590 */
1591
1592 /* Get the value of the symbol referred to by the reloc. Just
1593 in case this is the last reloc in the list, use the RL's
1594 addend to choose between this reloc (no addend) or the next
1595 (yes addend, which means at least one following reloc). */
1596 srel = irel + (relax_relocs ? 1 : 0);
1597 symval = OFFSET_FOR_RELOC (srel);
1598
1599 /* Setting gap_size nonzero is the flag which means "something
1600 shrunk". */
1601 gap_size = 0;
1602 gap = NULL;
1603 new_type = ELF32_R_TYPE(srel->r_info);
1604
1605 pc = sec->output_section->vma + sec->output_offset
1606 + srel->r_offset;
1607 pcrel = symval - pc + srel->r_addend;
1608
1609 if (machine == bfd_mach_m16c)
1610 {
1611 /* R8C / M16C */
1612
1613 switch (ELF32_R_TYPE(irel->r_info))
1614 {
1615
1616 case R_M32C_RL_JUMP:
1617 switch (insn[0])
1618 {
1619 case 0xfe: /* jmp.b */
1620 if (pcrel >= 2 && pcrel <= 9)
1621 {
1622 /* Relax JMP.B -> JMP.S. We need to get rid of
1623 the following reloc though. */
1624 insn[0] = 0x60 | (pcrel - 2);
1625 new_type = R_M32C_NONE;
1626 irel->r_addend = 0x10;
1627 gap_size = 1;
1628 gap = insn + 1;
1629 }
1630 break;
1631
1632 case 0xf4: /* jmp.w */
1633 /* 128 is allowed because it will be one byte closer
1634 after relaxing. Likewise for all other pc-rel
1635 jumps. */
1636 if (pcrel <= 128 && pcrel >= -128)
1637 {
1638 /* Relax JMP.W -> JMP.B */
1639 insn[0] = 0xfe;
1640 insn[1] = 0;
1641 new_type = R_M32C_8_PCREL;
1642 gap_size = 1;
1643 gap = insn + 2;
1644 }
1645 break;
1646
1647 case 0xfc: /* jmp.a */
1648 if (pcrel <= 32768 && pcrel >= -32768)
1649 {
1650 /* Relax JMP.A -> JMP.W */
1651 insn[0] = 0xf4;
1652 insn[1] = 0;
1653 insn[2] = 0;
1654 new_type = R_M32C_16_PCREL;
1655 gap_size = 1;
1656 gap = insn + 3;
1657 }
1658 break;
1659
1660 case 0xfd: /* jsr.a */
1661 if (pcrel <= 32768 && pcrel >= -32768)
1662 {
1663 /* Relax JSR.A -> JSR.W */
1664 insn[0] = 0xf5;
1665 insn[1] = 0;
1666 insn[2] = 0;
1667 new_type = R_M32C_16_PCREL;
1668 gap_size = 1;
1669 gap = insn + 3;
1670 }
1671 break;
1672 }
1673 break;
1674
1675 case R_M32C_RL_2ADDR:
1676 /* xxxx xxxx srce dest [src-disp] [dest-disp]*/
1677
1678 enctbl = m16c_addr_encodings;
1679 posn = 2;
1680 enc = (insn[1] >> 4) & 0x0f;
1681 e = & enctbl[enc];
1682
1683 if (srel->r_offset == irel->r_offset + posn
1684 && e->new_encoding != enc
1685 && symval <= e->max_disp)
1686 {
1687 insn[1] &= 0x0f;
1688 insn[1] |= e->new_encoding << 4;
1689 gap_size = e->bytes - enctbl[e->new_encoding].bytes;
1690 gap = insn + posn + enctbl[e->new_encoding].bytes;
1691 new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes];
1692 break;
1693 }
1694 if (relax_relocs == 2)
1695 srel ++;
1696 posn += e->bytes;
1697
1698 goto try_1addr_16;
1699
1700 case R_M32C_RL_1ADDR:
1701 /* xxxx xxxx xxxx dest [disp] */
1702
1703 enctbl = m16c_addr_encodings;
1704 posn = 2;
1705
1706 /* Check the opcode for jumps. We know it's safe to
1707 do this because all 2ADDR insns are at least two
1708 bytes long. */
1709 enc = insn[0] * 256 + insn[1];
1710 enc &= 0xfff0;
1711 if (enc == 0x7d20
1712 || enc == 0x7d00
1713 || enc == 0x7d30
1714 || enc == 0x7d10)
1715 {
1716 enctbl = m16c_jmpaddr_encodings;
1717 }
1718
1719 try_1addr_16:
1720 /* srel, posn, and enc must be set here. */
1721
1722 symval = OFFSET_FOR_RELOC (srel);
1723 enc = insn[1] & 0x0f;
1724 e = & enctbl[enc];
1725
1726 if (srel->r_offset == irel->r_offset + posn
1727 && e->new_encoding != enc
1728 && symval <= e->max_disp)
1729 {
1730 insn[1] &= 0xf0;
1731 insn[1] |= e->new_encoding;
1732 gap_size = e->bytes - enctbl[e->new_encoding].bytes;
1733 gap = insn + posn + enctbl[e->new_encoding].bytes;
1734 new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes];
1735 break;
1736 }
1737
1738 break;
1739
1740 } /* Ends switch (reloc type) for m16c. */
1741 }
1742 else /* machine == bfd_mach_m32c */
1743 {
1744 /* M32CM / M32C */
1745
1746 switch (ELF32_R_TYPE(irel->r_info))
1747 {
1748
1749 case R_M32C_RL_JUMP:
1750 switch (insn[0])
1751 {
1752 case 0xbb: /* jmp.b */
1753 if (pcrel >= 2 && pcrel <= 9)
1754 {
1755 int p = pcrel - 2;
1756 /* Relax JMP.B -> JMP.S. We need to get rid of
1757 the following reloc though. */
1758 insn[0] = 0x4a | ((p << 3) & 0x30) | (p & 1);
1759 new_type = R_M32C_NONE;
1760 irel->r_addend = 0x10;
1761 gap_size = 1;
1762 gap = insn + 1;
1763 }
1764 break;
1765
1766 case 0xce: /* jmp.w */
1767 if (pcrel <= 128 && pcrel >= -128)
1768 {
1769 /* Relax JMP.W -> JMP.B */
1770 insn[0] = 0xbb;
1771 insn[1] = 0;
1772 new_type = R_M32C_8_PCREL;
1773 gap_size = 1;
1774 gap = insn + 2;
1775 }
1776 break;
1777
1778 case 0xcc: /* jmp.a */
1779 if (pcrel <= 32768 && pcrel >= -32768)
1780 {
1781 /* Relax JMP.A -> JMP.W */
1782 insn[0] = 0xce;
1783 insn[1] = 0;
1784 insn[2] = 0;
1785 new_type = R_M32C_16_PCREL;
1786 gap_size = 1;
1787 gap = insn + 3;
1788 }
1789 break;
1790
1791 case 0xcd: /* jsr.a */
1792 if (pcrel <= 32768 && pcrel >= -32768)
1793 {
1794 /* Relax JSR.A -> JSR.W */
1795 insn[0] = 0xcf;
1796 insn[1] = 0;
1797 insn[2] = 0;
1798 new_type = R_M32C_16_PCREL;
1799 gap_size = 1;
1800 gap = insn + 3;
1801 }
1802 break;
1803 }
1804 break;
1805
1806 case R_M32C_RL_2ADDR:
1807 /* xSSS DDDx DDSS xxxx [src-disp] [dest-disp]*/
1808
1809 einsn = insn;
1810 posn = 2;
1811 if (einsn[0] == 1)
1812 {
1813 /* prefix; remove it as far as the RL reloc is concerned. */
1814 einsn ++;
1815 posn ++;
1816 }
1817
1818 enctbl = m32c_addr_encodings;
1819 enc = ((einsn[0] & 0x70) >> 2) | ((einsn[1] & 0x30) >> 4);
1820 e = & enctbl[enc];
1821
1822 if (srel->r_offset == irel->r_offset + posn
1823 && e->new_encoding != enc
1824 && symval <= e->max_disp)
1825 {
1826 einsn[0] &= 0x8f;
1827 einsn[0] |= (e->new_encoding & 0x1c) << 2;
1828 einsn[1] &= 0xcf;
1829 einsn[1] |= (e->new_encoding & 0x03) << 4;
1830 gap_size = e->bytes - enctbl[e->new_encoding].bytes;
1831 gap = insn + posn + enctbl[e->new_encoding].bytes;
1832 new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes];
1833 break;
1834 }
1835 if (relax_relocs == 2)
1836 srel ++;
1837 posn += e->bytes;
1838
1839 goto try_1addr_32;
1840
1841 case R_M32C_RL_1ADDR:
1842 /* xxxx DDDx DDxx xxxx [disp] */
1843
1844 einsn = insn;
1845 posn = 2;
1846 if (einsn[0] == 1)
1847 {
1848 /* prefix; remove it as far as the RL reloc is concerned. */
1849 einsn ++;
1850 posn ++;
1851 }
1852
1853 enctbl = m32c_addr_encodings;
1854
1855 try_1addr_32:
1856 /* srel, posn, and enc must be set here. */
1857
1858 symval = OFFSET_FOR_RELOC (srel);
1859 enc = ((einsn[0] & 0x0e) << 1) | ((einsn[1] & 0xc0) >> 6);
1860 e = & enctbl[enc];
1861
1862 if (srel->r_offset == irel->r_offset + posn
1863 && e->new_encoding != enc
1864 && symval <= e->max_disp)
1865 {
1866 einsn[0] &= 0xf1;
1867 einsn[0] |= (e->new_encoding & 0x1c) >> 1;
1868 einsn[1] &= 0x3f;
1869 einsn[1] |= (e->new_encoding & 0x03) << 6;
1870 gap_size = e->bytes - enctbl[e->new_encoding].bytes;
1871 gap = insn + posn + enctbl[e->new_encoding].bytes;
1872 new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes];
1873 break;
1874 }
1875
1876 break;
1877
1878 } /* Ends switch (reloc type) for m32c. */
1879 }
1880
1881 if (gap_size == 0)
1882 continue;
1883
1884 *again = true;
1885
1886 srel->r_info = ELF32_R_INFO (ELF32_R_SYM (srel->r_info), new_type);
1887
1888 /* Note that we've changed the relocs, section contents, etc. */
1889 elf_section_data (sec)->relocs = internal_relocs;
1890 free_relocs = NULL;
1891
1892 elf_section_data (sec)->this_hdr.contents = contents;
1893 free_contents = NULL;
1894
1895 symtab_hdr->contents = (bfd_byte *) intsyms;
1896 free_intsyms = NULL;
1897
1898 bytes_saved += gap_size;
1899
1900 if (! m32c_elf_relax_delete_bytes(abfd, sec, gap - contents, gap_size))
1901 goto error_return;
1902
1903 } /* next relocation */
1904
1905 free (free_relocs);
1906 free_relocs = NULL;
1907
1908 if (free_contents != NULL)
1909 {
1910 if (! link_info->keep_memory)
1911 free (free_contents);
1912 /* Cache the section contents for elf_link_input_bfd. */
1913 else
1914 elf_section_data (sec)->this_hdr.contents = contents;
1915
1916 free_contents = NULL;
1917 }
1918
1919 if (shndx_buf != NULL)
1920 {
1921 shndx_hdr->contents = NULL;
1922 free (shndx_buf);
1923 }
1924
1925 if (free_intsyms != NULL)
1926 {
1927 if (! link_info->keep_memory)
1928 free (free_intsyms);
1929 /* Cache the symbols for elf_link_input_bfd. */
1930 else
1931 {
1932 symtab_hdr->contents = NULL /* (unsigned char *) intsyms*/;
1933 }
1934
1935 free_intsyms = NULL;
1936 }
1937
1938 return true;
1939
1940 error_return:
1941 free (free_relocs);
1942 free (free_contents);
1943 if (shndx_buf != NULL)
1944 {
1945 shndx_hdr->contents = NULL;
1946 free (shndx_buf);
1947 }
1948 free (free_intsyms);
1949 return false;
1950 }
1951
1952 /* Delete some bytes from a section while relaxing. */
1953
1954 static bool
m32c_elf_relax_delete_bytes(bfd * abfd,asection * sec,bfd_vma addr,int count)1955 m32c_elf_relax_delete_bytes (bfd *abfd,
1956 asection *sec,
1957 bfd_vma addr,
1958 int count)
1959 {
1960 Elf_Internal_Shdr *symtab_hdr;
1961 Elf_Internal_Shdr *shndx_hdr;
1962 int sec_shndx;
1963 bfd_byte *contents;
1964 Elf_Internal_Rela *irel;
1965 Elf_Internal_Rela *irelend;
1966 bfd_vma toaddr;
1967 Elf_Internal_Sym *isym;
1968 Elf_Internal_Sym *isymend;
1969 Elf_Internal_Sym *intsyms;
1970 Elf_External_Sym_Shndx *shndx_buf;
1971 Elf_External_Sym_Shndx *shndx;
1972 struct elf_link_hash_entry ** sym_hashes;
1973 struct elf_link_hash_entry ** end_hashes;
1974 unsigned int symcount;
1975
1976 contents = elf_section_data (sec)->this_hdr.contents;
1977
1978 toaddr = sec->size;
1979
1980 irel = elf_section_data (sec)->relocs;
1981 irelend = irel + sec->reloc_count;
1982
1983 /* Actually delete the bytes. */
1984 memmove (contents + addr, contents + addr + count, (size_t) (toaddr - addr - count));
1985 sec->size -= count;
1986
1987 /* Adjust all the relocs. */
1988 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel ++)
1989 {
1990 /* Get the new reloc address. */
1991 if (irel->r_offset > addr && irel->r_offset < toaddr)
1992 irel->r_offset -= count;
1993
1994 if (ELF32_R_TYPE(irel->r_info) == R_M32C_RL_JUMP
1995 && irel->r_addend == 0x10 /* one byte insn, no relocs */
1996 && irel->r_offset + 1 < addr
1997 && irel->r_offset + 7 > addr)
1998 {
1999 bfd_vma disp;
2000 unsigned char *insn = &contents[irel->r_offset];
2001 disp = *insn;
2002 /* This is a JMP.S, which we have to manually update. */
2003 if (elf32_m32c_machine (abfd) == bfd_mach_m16c)
2004 {
2005 if ((*insn & 0xf8) != 0x60)
2006 continue;
2007 disp = (disp & 7);
2008 }
2009 else
2010 {
2011 if ((*insn & 0xce) != 0x4a)
2012 continue;
2013 disp = ((disp & 0x30) >> 3) | (disp & 1);
2014 }
2015 if (irel->r_offset + disp + 2 >= addr+count)
2016 {
2017 disp -= count;
2018 if (elf32_m32c_machine (abfd) == bfd_mach_m16c)
2019 {
2020 *insn = (*insn & 0xf8) | disp;
2021 }
2022 else
2023 {
2024 *insn = (*insn & 0xce) | ((disp & 6) << 3) | (disp & 1);
2025 }
2026 }
2027 }
2028 }
2029
2030 /* Adjust the local symbols defined in this section. */
2031 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
2032 intsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
2033 isym = intsyms;
2034 isymend = isym + symtab_hdr->sh_info;
2035
2036 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
2037 if (elf_symtab_shndx_list (abfd))
2038 {
2039 shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
2040 shndx_buf = (Elf_External_Sym_Shndx *) shndx_hdr->contents;
2041 }
2042 else
2043 {
2044 shndx_hdr = NULL;
2045 shndx_buf = NULL;
2046 }
2047 shndx = shndx_buf;
2048
2049 for (; isym < isymend; isym++, shndx = (shndx ? shndx + 1 : NULL))
2050 {
2051 /* If the symbol is in the range of memory we just moved, we
2052 have to adjust its value. */
2053 if ((int) isym->st_shndx == sec_shndx
2054 && isym->st_value > addr
2055 && isym->st_value < toaddr)
2056 {
2057 isym->st_value -= count;
2058 }
2059 /* If the symbol *spans* the bytes we just deleted (i.e. it's
2060 *end* is in the moved bytes but it's *start* isn't), then we
2061 must adjust its size. */
2062 if ((int) isym->st_shndx == sec_shndx
2063 && isym->st_value < addr
2064 && isym->st_value + isym->st_size > addr
2065 && isym->st_value + isym->st_size < toaddr)
2066 {
2067 isym->st_size -= count;
2068 }
2069 }
2070
2071 /* Now adjust the global symbols defined in this section. */
2072 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
2073 - symtab_hdr->sh_info);
2074 sym_hashes = elf_sym_hashes (abfd);
2075 end_hashes = sym_hashes + symcount;
2076
2077 for (; sym_hashes < end_hashes; sym_hashes ++)
2078 {
2079 struct elf_link_hash_entry * sym_hash = * sym_hashes;
2080
2081 if (sym_hash &&
2082 (sym_hash->root.type == bfd_link_hash_defined
2083 || sym_hash->root.type == bfd_link_hash_defweak)
2084 && sym_hash->root.u.def.section == sec)
2085 {
2086 if (sym_hash->root.u.def.value > addr
2087 && sym_hash->root.u.def.value < toaddr)
2088 {
2089 sym_hash->root.u.def.value -= count;
2090 }
2091 if (sym_hash->root.u.def.value < addr
2092 && sym_hash->root.u.def.value + sym_hash->size > addr
2093 && sym_hash->root.u.def.value + sym_hash->size < toaddr)
2094 {
2095 sym_hash->size -= count;
2096 }
2097 }
2098 }
2099
2100 return true;
2101 }
2102
2103 /* This is for versions of gcc prior to 4.3. */
2104 static unsigned int
_bfd_m32c_elf_eh_frame_address_size(bfd * abfd,const asection * sec ATTRIBUTE_UNUSED)2105 _bfd_m32c_elf_eh_frame_address_size (bfd *abfd,
2106 const asection *sec ATTRIBUTE_UNUSED)
2107 {
2108 if ((elf_elfheader (abfd)->e_flags & EF_M32C_CPU_MASK) == EF_M32C_CPU_M16C)
2109 return 2;
2110 return 4;
2111 }
2112
2113
2114
2115 #define ELF_ARCH bfd_arch_m32c
2116 #define ELF_MACHINE_CODE EM_M32C
2117 #define ELF_MACHINE_ALT1 EM_M32C_OLD
2118 #define ELF_MAXPAGESIZE 0x100
2119
2120 #if 0
2121 #define TARGET_BIG_SYM m32c_elf32_vec
2122 #define TARGET_BIG_NAME "elf32-m32c"
2123 #else
2124 #define TARGET_LITTLE_SYM m32c_elf32_vec
2125 #define TARGET_LITTLE_NAME "elf32-m32c"
2126 #endif
2127
2128 #define elf_info_to_howto_rel NULL
2129 #define elf_info_to_howto m32c_info_to_howto_rela
2130 #define elf_backend_object_p m32c_elf_object_p
2131 #define elf_backend_relocate_section m32c_elf_relocate_section
2132 #define elf_backend_check_relocs m32c_elf_check_relocs
2133 #define elf_backend_object_p m32c_elf_object_p
2134 #define elf_symbol_leading_char ('_')
2135 #define elf_backend_always_size_sections \
2136 m32c_elf_always_size_sections
2137 #define elf_backend_finish_dynamic_sections \
2138 m32c_elf_finish_dynamic_sections
2139
2140 #define elf_backend_can_gc_sections 1
2141 #define elf_backend_eh_frame_address_size _bfd_m32c_elf_eh_frame_address_size
2142
2143 #define bfd_elf32_bfd_reloc_type_lookup m32c_reloc_type_lookup
2144 #define bfd_elf32_bfd_reloc_name_lookup m32c_reloc_name_lookup
2145 #define bfd_elf32_bfd_relax_section m32c_elf_relax_section
2146 #define bfd_elf32_bfd_set_private_flags m32c_elf_set_private_flags
2147 #define bfd_elf32_bfd_merge_private_bfd_data m32c_elf_merge_private_bfd_data
2148 #define bfd_elf32_bfd_print_private_bfd_data m32c_elf_print_private_bfd_data
2149
2150 #include "elf32-target.h"
2151