elf32-m68hc1x.c revision 1.1
1 /* Motorola 68HC11/HC12-specific support for 32-bit ELF 2 Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 3 2009, 2010 Free Software Foundation, Inc. 4 Contributed by Stephane Carrez (stcarrez (at) nerim.fr) 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 #include "alloca-conf.h" 24 #include "sysdep.h" 25 #include "bfd.h" 26 #include "bfdlink.h" 27 #include "libbfd.h" 28 #include "elf-bfd.h" 29 #include "elf32-m68hc1x.h" 30 #include "elf/m68hc11.h" 31 #include "opcode/m68hc11.h" 32 33 34 #define m68hc12_stub_hash_lookup(table, string, create, copy) \ 35 ((struct elf32_m68hc11_stub_hash_entry *) \ 36 bfd_hash_lookup ((table), (string), (create), (copy))) 37 38 static struct elf32_m68hc11_stub_hash_entry* m68hc12_add_stub 39 (const char *stub_name, 40 asection *section, 41 struct m68hc11_elf_link_hash_table *htab); 42 43 static struct bfd_hash_entry *stub_hash_newfunc 44 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 45 46 static void m68hc11_elf_set_symbol (bfd* abfd, struct bfd_link_info *info, 47 const char* name, bfd_vma value, 48 asection* sec); 49 50 static bfd_boolean m68hc11_elf_export_one_stub 51 (struct bfd_hash_entry *gen_entry, void *in_arg); 52 53 static void scan_sections_for_abi (bfd*, asection*, PTR); 54 55 struct m68hc11_scan_param 56 { 57 struct m68hc11_page_info* pinfo; 58 bfd_boolean use_memory_banks; 59 }; 60 61 62 /* Create a 68HC11/68HC12 ELF linker hash table. */ 63 64 struct m68hc11_elf_link_hash_table* 65 m68hc11_elf_hash_table_create (bfd *abfd) 66 { 67 struct m68hc11_elf_link_hash_table *ret; 68 bfd_size_type amt = sizeof (struct m68hc11_elf_link_hash_table); 69 70 ret = (struct m68hc11_elf_link_hash_table *) bfd_malloc (amt); 71 if (ret == (struct m68hc11_elf_link_hash_table *) NULL) 72 return NULL; 73 74 memset (ret, 0, amt); 75 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 76 _bfd_elf_link_hash_newfunc, 77 sizeof (struct elf_link_hash_entry), 78 M68HC11_ELF_DATA)) 79 { 80 free (ret); 81 return NULL; 82 } 83 84 /* Init the stub hash table too. */ 85 amt = sizeof (struct bfd_hash_table); 86 ret->stub_hash_table = (struct bfd_hash_table*) bfd_malloc (amt); 87 if (ret->stub_hash_table == NULL) 88 { 89 free (ret); 90 return NULL; 91 } 92 if (!bfd_hash_table_init (ret->stub_hash_table, stub_hash_newfunc, 93 sizeof (struct elf32_m68hc11_stub_hash_entry))) 94 return NULL; 95 96 ret->stub_bfd = NULL; 97 ret->stub_section = 0; 98 ret->add_stub_section = NULL; 99 ret->sym_cache.abfd = NULL; 100 101 return ret; 102 } 103 104 /* Free the derived linker hash table. */ 105 106 void 107 m68hc11_elf_bfd_link_hash_table_free (struct bfd_link_hash_table *hash) 108 { 109 struct m68hc11_elf_link_hash_table *ret 110 = (struct m68hc11_elf_link_hash_table *) hash; 111 112 bfd_hash_table_free (ret->stub_hash_table); 113 free (ret->stub_hash_table); 114 _bfd_generic_link_hash_table_free (hash); 115 } 116 117 /* Assorted hash table functions. */ 118 119 /* Initialize an entry in the stub hash table. */ 120 121 static struct bfd_hash_entry * 122 stub_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, 123 const char *string) 124 { 125 /* Allocate the structure if it has not already been allocated by a 126 subclass. */ 127 if (entry == NULL) 128 { 129 entry = bfd_hash_allocate (table, 130 sizeof (struct elf32_m68hc11_stub_hash_entry)); 131 if (entry == NULL) 132 return entry; 133 } 134 135 /* Call the allocation method of the superclass. */ 136 entry = bfd_hash_newfunc (entry, table, string); 137 if (entry != NULL) 138 { 139 struct elf32_m68hc11_stub_hash_entry *eh; 140 141 /* Initialize the local fields. */ 142 eh = (struct elf32_m68hc11_stub_hash_entry *) entry; 143 eh->stub_sec = NULL; 144 eh->stub_offset = 0; 145 eh->target_value = 0; 146 eh->target_section = NULL; 147 } 148 149 return entry; 150 } 151 152 /* Add a new stub entry to the stub hash. Not all fields of the new 153 stub entry are initialised. */ 154 155 static struct elf32_m68hc11_stub_hash_entry * 156 m68hc12_add_stub (const char *stub_name, asection *section, 157 struct m68hc11_elf_link_hash_table *htab) 158 { 159 struct elf32_m68hc11_stub_hash_entry *stub_entry; 160 161 /* Enter this entry into the linker stub hash table. */ 162 stub_entry = m68hc12_stub_hash_lookup (htab->stub_hash_table, stub_name, 163 TRUE, FALSE); 164 if (stub_entry == NULL) 165 { 166 (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), 167 section->owner, stub_name); 168 return NULL; 169 } 170 171 if (htab->stub_section == 0) 172 { 173 htab->stub_section = (*htab->add_stub_section) (".tramp", 174 htab->tramp_section); 175 } 176 177 stub_entry->stub_sec = htab->stub_section; 178 stub_entry->stub_offset = 0; 179 return stub_entry; 180 } 181 182 /* Hook called by the linker routine which adds symbols from an object 183 file. We use it for identify far symbols and force a loading of 184 the trampoline handler. */ 185 186 bfd_boolean 187 elf32_m68hc11_add_symbol_hook (bfd *abfd, struct bfd_link_info *info, 188 Elf_Internal_Sym *sym, 189 const char **namep ATTRIBUTE_UNUSED, 190 flagword *flagsp ATTRIBUTE_UNUSED, 191 asection **secp ATTRIBUTE_UNUSED, 192 bfd_vma *valp ATTRIBUTE_UNUSED) 193 { 194 if (sym->st_other & STO_M68HC12_FAR) 195 { 196 struct elf_link_hash_entry *h; 197 198 h = (struct elf_link_hash_entry *) 199 bfd_link_hash_lookup (info->hash, "__far_trampoline", 200 FALSE, FALSE, FALSE); 201 if (h == NULL) 202 { 203 struct bfd_link_hash_entry* entry = NULL; 204 205 _bfd_generic_link_add_one_symbol (info, abfd, 206 "__far_trampoline", 207 BSF_GLOBAL, 208 bfd_und_section_ptr, 209 (bfd_vma) 0, (const char*) NULL, 210 FALSE, FALSE, &entry); 211 } 212 213 } 214 return TRUE; 215 } 216 217 /* External entry points for sizing and building linker stubs. */ 218 219 /* Set up various things so that we can make a list of input sections 220 for each output section included in the link. Returns -1 on error, 221 0 when no stubs will be needed, and 1 on success. */ 222 223 int 224 elf32_m68hc11_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info) 225 { 226 bfd *input_bfd; 227 unsigned int bfd_count; 228 int top_id, top_index; 229 asection *section; 230 asection **input_list, **list; 231 bfd_size_type amt; 232 asection *text_section; 233 struct m68hc11_elf_link_hash_table *htab; 234 235 htab = m68hc11_elf_hash_table (info); 236 if (htab == NULL) 237 return -1; 238 239 if (bfd_get_flavour (info->output_bfd) != bfd_target_elf_flavour) 240 return 0; 241 242 /* Count the number of input BFDs and find the top input section id. 243 Also search for an existing ".tramp" section so that we know 244 where generated trampolines must go. Default to ".text" if we 245 can't find it. */ 246 htab->tramp_section = 0; 247 text_section = 0; 248 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; 249 input_bfd != NULL; 250 input_bfd = input_bfd->link_next) 251 { 252 bfd_count += 1; 253 for (section = input_bfd->sections; 254 section != NULL; 255 section = section->next) 256 { 257 const char* name = bfd_get_section_name (input_bfd, section); 258 259 if (!strcmp (name, ".tramp")) 260 htab->tramp_section = section; 261 262 if (!strcmp (name, ".text")) 263 text_section = section; 264 265 if (top_id < section->id) 266 top_id = section->id; 267 } 268 } 269 htab->bfd_count = bfd_count; 270 if (htab->tramp_section == 0) 271 htab->tramp_section = text_section; 272 273 /* We can't use output_bfd->section_count here to find the top output 274 section index as some sections may have been removed, and 275 strip_excluded_output_sections doesn't renumber the indices. */ 276 for (section = output_bfd->sections, top_index = 0; 277 section != NULL; 278 section = section->next) 279 { 280 if (top_index < section->index) 281 top_index = section->index; 282 } 283 284 htab->top_index = top_index; 285 amt = sizeof (asection *) * (top_index + 1); 286 input_list = (asection **) bfd_malloc (amt); 287 htab->input_list = input_list; 288 if (input_list == NULL) 289 return -1; 290 291 /* For sections we aren't interested in, mark their entries with a 292 value we can check later. */ 293 list = input_list + top_index; 294 do 295 *list = bfd_abs_section_ptr; 296 while (list-- != input_list); 297 298 for (section = output_bfd->sections; 299 section != NULL; 300 section = section->next) 301 { 302 if ((section->flags & SEC_CODE) != 0) 303 input_list[section->index] = NULL; 304 } 305 306 return 1; 307 } 308 309 /* Determine and set the size of the stub section for a final link. 310 311 The basic idea here is to examine all the relocations looking for 312 PC-relative calls to a target that is unreachable with a "bl" 313 instruction. */ 314 315 bfd_boolean 316 elf32_m68hc11_size_stubs (bfd *output_bfd, bfd *stub_bfd, 317 struct bfd_link_info *info, 318 asection * (*add_stub_section) (const char*, asection*)) 319 { 320 bfd *input_bfd; 321 asection *section; 322 Elf_Internal_Sym *local_syms, **all_local_syms; 323 unsigned int bfd_indx, bfd_count; 324 bfd_size_type amt; 325 asection *stub_sec; 326 struct m68hc11_elf_link_hash_table *htab = m68hc11_elf_hash_table (info); 327 328 if (htab == NULL) 329 return FALSE; 330 331 /* Stash our params away. */ 332 htab->stub_bfd = stub_bfd; 333 htab->add_stub_section = add_stub_section; 334 335 /* Count the number of input BFDs and find the top input section id. */ 336 for (input_bfd = info->input_bfds, bfd_count = 0; 337 input_bfd != NULL; 338 input_bfd = input_bfd->link_next) 339 bfd_count += 1; 340 341 /* We want to read in symbol extension records only once. To do this 342 we need to read in the local symbols in parallel and save them for 343 later use; so hold pointers to the local symbols in an array. */ 344 amt = sizeof (Elf_Internal_Sym *) * bfd_count; 345 all_local_syms = (Elf_Internal_Sym **) bfd_zmalloc (amt); 346 if (all_local_syms == NULL) 347 return FALSE; 348 349 /* Walk over all the input BFDs, swapping in local symbols. */ 350 for (input_bfd = info->input_bfds, bfd_indx = 0; 351 input_bfd != NULL; 352 input_bfd = input_bfd->link_next, bfd_indx++) 353 { 354 Elf_Internal_Shdr *symtab_hdr; 355 356 /* We'll need the symbol table in a second. */ 357 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 358 if (symtab_hdr->sh_info == 0) 359 continue; 360 361 /* We need an array of the local symbols attached to the input bfd. */ 362 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents; 363 if (local_syms == NULL) 364 { 365 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, 366 symtab_hdr->sh_info, 0, 367 NULL, NULL, NULL); 368 /* Cache them for elf_link_input_bfd. */ 369 symtab_hdr->contents = (unsigned char *) local_syms; 370 } 371 if (local_syms == NULL) 372 { 373 free (all_local_syms); 374 return FALSE; 375 } 376 377 all_local_syms[bfd_indx] = local_syms; 378 } 379 380 for (input_bfd = info->input_bfds, bfd_indx = 0; 381 input_bfd != NULL; 382 input_bfd = input_bfd->link_next, bfd_indx++) 383 { 384 Elf_Internal_Shdr *symtab_hdr; 385 struct elf_link_hash_entry ** sym_hashes; 386 387 sym_hashes = elf_sym_hashes (input_bfd); 388 389 /* We'll need the symbol table in a second. */ 390 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 391 if (symtab_hdr->sh_info == 0) 392 continue; 393 394 local_syms = all_local_syms[bfd_indx]; 395 396 /* Walk over each section attached to the input bfd. */ 397 for (section = input_bfd->sections; 398 section != NULL; 399 section = section->next) 400 { 401 Elf_Internal_Rela *internal_relocs, *irelaend, *irela; 402 403 /* If there aren't any relocs, then there's nothing more 404 to do. */ 405 if ((section->flags & SEC_RELOC) == 0 406 || section->reloc_count == 0) 407 continue; 408 409 /* If this section is a link-once section that will be 410 discarded, then don't create any stubs. */ 411 if (section->output_section == NULL 412 || section->output_section->owner != output_bfd) 413 continue; 414 415 /* Get the relocs. */ 416 internal_relocs 417 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, 418 (Elf_Internal_Rela *) NULL, 419 info->keep_memory); 420 if (internal_relocs == NULL) 421 goto error_ret_free_local; 422 423 /* Now examine each relocation. */ 424 irela = internal_relocs; 425 irelaend = irela + section->reloc_count; 426 for (; irela < irelaend; irela++) 427 { 428 unsigned int r_type, r_indx; 429 struct elf32_m68hc11_stub_hash_entry *stub_entry; 430 asection *sym_sec; 431 bfd_vma sym_value; 432 struct elf_link_hash_entry *hash; 433 const char *stub_name; 434 Elf_Internal_Sym *sym; 435 436 r_type = ELF32_R_TYPE (irela->r_info); 437 438 /* Only look at 16-bit relocs. */ 439 if (r_type != (unsigned int) R_M68HC11_16) 440 continue; 441 442 /* Now determine the call target, its name, value, 443 section. */ 444 r_indx = ELF32_R_SYM (irela->r_info); 445 if (r_indx < symtab_hdr->sh_info) 446 { 447 /* It's a local symbol. */ 448 Elf_Internal_Shdr *hdr; 449 bfd_boolean is_far; 450 451 sym = local_syms + r_indx; 452 is_far = (sym && (sym->st_other & STO_M68HC12_FAR)); 453 if (!is_far) 454 continue; 455 456 if (sym->st_shndx >= elf_numsections (input_bfd)) 457 sym_sec = NULL; 458 else 459 { 460 hdr = elf_elfsections (input_bfd)[sym->st_shndx]; 461 sym_sec = hdr->bfd_section; 462 } 463 stub_name = (bfd_elf_string_from_elf_section 464 (input_bfd, symtab_hdr->sh_link, 465 sym->st_name)); 466 sym_value = sym->st_value; 467 hash = NULL; 468 } 469 else 470 { 471 /* It's an external symbol. */ 472 int e_indx; 473 474 e_indx = r_indx - symtab_hdr->sh_info; 475 hash = (struct elf_link_hash_entry *) 476 (sym_hashes[e_indx]); 477 478 while (hash->root.type == bfd_link_hash_indirect 479 || hash->root.type == bfd_link_hash_warning) 480 hash = ((struct elf_link_hash_entry *) 481 hash->root.u.i.link); 482 483 if (hash->root.type == bfd_link_hash_defined 484 || hash->root.type == bfd_link_hash_defweak 485 || hash->root.type == bfd_link_hash_new) 486 { 487 if (!(hash->other & STO_M68HC12_FAR)) 488 continue; 489 } 490 else if (hash->root.type == bfd_link_hash_undefweak) 491 { 492 continue; 493 } 494 else if (hash->root.type == bfd_link_hash_undefined) 495 { 496 continue; 497 } 498 else 499 { 500 bfd_set_error (bfd_error_bad_value); 501 goto error_ret_free_internal; 502 } 503 sym_sec = hash->root.u.def.section; 504 sym_value = hash->root.u.def.value; 505 stub_name = hash->root.root.string; 506 } 507 508 if (!stub_name) 509 goto error_ret_free_internal; 510 511 stub_entry = m68hc12_stub_hash_lookup 512 (htab->stub_hash_table, 513 stub_name, 514 FALSE, FALSE); 515 if (stub_entry == NULL) 516 { 517 if (add_stub_section == 0) 518 continue; 519 520 stub_entry = m68hc12_add_stub (stub_name, section, htab); 521 if (stub_entry == NULL) 522 { 523 error_ret_free_internal: 524 if (elf_section_data (section)->relocs == NULL) 525 free (internal_relocs); 526 goto error_ret_free_local; 527 } 528 } 529 530 stub_entry->target_value = sym_value; 531 stub_entry->target_section = sym_sec; 532 } 533 534 /* We're done with the internal relocs, free them. */ 535 if (elf_section_data (section)->relocs == NULL) 536 free (internal_relocs); 537 } 538 } 539 540 if (add_stub_section) 541 { 542 /* OK, we've added some stubs. Find out the new size of the 543 stub sections. */ 544 for (stub_sec = htab->stub_bfd->sections; 545 stub_sec != NULL; 546 stub_sec = stub_sec->next) 547 { 548 stub_sec->size = 0; 549 } 550 551 bfd_hash_traverse (htab->stub_hash_table, htab->size_one_stub, htab); 552 } 553 free (all_local_syms); 554 return TRUE; 555 556 error_ret_free_local: 557 free (all_local_syms); 558 return FALSE; 559 } 560 561 /* Export the trampoline addresses in the symbol table. */ 562 static bfd_boolean 563 m68hc11_elf_export_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) 564 { 565 struct bfd_link_info *info; 566 struct m68hc11_elf_link_hash_table *htab; 567 struct elf32_m68hc11_stub_hash_entry *stub_entry; 568 char* name; 569 bfd_boolean result; 570 571 info = (struct bfd_link_info *) in_arg; 572 htab = m68hc11_elf_hash_table (info); 573 if (htab == NULL) 574 return FALSE; 575 576 /* Massage our args to the form they really have. */ 577 stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; 578 579 /* Generate the trampoline according to HC11 or HC12. */ 580 result = (* htab->build_one_stub) (gen_entry, in_arg); 581 582 /* Make a printable name that does not conflict with the real function. */ 583 name = alloca (strlen (stub_entry->root.string) + 16); 584 sprintf (name, "tramp.%s", stub_entry->root.string); 585 586 /* Export the symbol for debugging/disassembling. */ 587 m68hc11_elf_set_symbol (htab->stub_bfd, info, name, 588 stub_entry->stub_offset, 589 stub_entry->stub_sec); 590 return result; 591 } 592 593 /* Export a symbol or set its value and section. */ 594 static void 595 m68hc11_elf_set_symbol (bfd *abfd, struct bfd_link_info *info, 596 const char *name, bfd_vma value, asection *sec) 597 { 598 struct elf_link_hash_entry *h; 599 600 h = (struct elf_link_hash_entry *) 601 bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, FALSE); 602 if (h == NULL) 603 { 604 _bfd_generic_link_add_one_symbol (info, abfd, 605 name, 606 BSF_GLOBAL, 607 sec, 608 value, 609 (const char*) NULL, 610 TRUE, FALSE, NULL); 611 } 612 else 613 { 614 h->root.type = bfd_link_hash_defined; 615 h->root.u.def.value = value; 616 h->root.u.def.section = sec; 617 } 618 } 619 620 621 /* Build all the stubs associated with the current output file. The 622 stubs are kept in a hash table attached to the main linker hash 623 table. This function is called via m68hc12elf_finish in the 624 linker. */ 625 626 bfd_boolean 627 elf32_m68hc11_build_stubs (bfd *abfd, struct bfd_link_info *info) 628 { 629 asection *stub_sec; 630 struct bfd_hash_table *table; 631 struct m68hc11_elf_link_hash_table *htab; 632 struct m68hc11_scan_param param; 633 634 m68hc11_elf_get_bank_parameters (info); 635 htab = m68hc11_elf_hash_table (info); 636 if (htab == NULL) 637 return FALSE; 638 639 for (stub_sec = htab->stub_bfd->sections; 640 stub_sec != NULL; 641 stub_sec = stub_sec->next) 642 { 643 bfd_size_type size; 644 645 /* Allocate memory to hold the linker stubs. */ 646 size = stub_sec->size; 647 stub_sec->contents = (unsigned char *) bfd_zalloc (htab->stub_bfd, size); 648 if (stub_sec->contents == NULL && size != 0) 649 return FALSE; 650 stub_sec->size = 0; 651 } 652 653 /* Build the stubs as directed by the stub hash table. */ 654 table = htab->stub_hash_table; 655 bfd_hash_traverse (table, m68hc11_elf_export_one_stub, info); 656 657 /* Scan the output sections to see if we use the memory banks. 658 If so, export the symbols that define how the memory banks 659 are mapped. This is used by gdb and the simulator to obtain 660 the information. It can be used by programs to burn the eprom 661 at the good addresses. */ 662 param.use_memory_banks = FALSE; 663 param.pinfo = &htab->pinfo; 664 bfd_map_over_sections (abfd, scan_sections_for_abi, ¶m); 665 if (param.use_memory_banks) 666 { 667 m68hc11_elf_set_symbol (abfd, info, BFD_M68HC11_BANK_START_NAME, 668 htab->pinfo.bank_physical, 669 bfd_abs_section_ptr); 670 m68hc11_elf_set_symbol (abfd, info, BFD_M68HC11_BANK_VIRTUAL_NAME, 671 htab->pinfo.bank_virtual, 672 bfd_abs_section_ptr); 673 m68hc11_elf_set_symbol (abfd, info, BFD_M68HC11_BANK_SIZE_NAME, 674 htab->pinfo.bank_size, 675 bfd_abs_section_ptr); 676 } 677 678 return TRUE; 679 } 680 681 void 682 m68hc11_elf_get_bank_parameters (struct bfd_link_info *info) 683 { 684 unsigned i; 685 struct m68hc11_page_info *pinfo; 686 struct bfd_link_hash_entry *h; 687 struct m68hc11_elf_link_hash_table *htab; 688 689 htab = m68hc11_elf_hash_table (info); 690 if (htab == NULL) 691 return; 692 693 pinfo = & htab->pinfo; 694 if (pinfo->bank_param_initialized) 695 return; 696 697 pinfo->bank_virtual = M68HC12_BANK_VIRT; 698 pinfo->bank_mask = M68HC12_BANK_MASK; 699 pinfo->bank_physical = M68HC12_BANK_BASE; 700 pinfo->bank_shift = M68HC12_BANK_SHIFT; 701 pinfo->bank_size = 1 << M68HC12_BANK_SHIFT; 702 703 h = bfd_link_hash_lookup (info->hash, BFD_M68HC11_BANK_START_NAME, 704 FALSE, FALSE, TRUE); 705 if (h != (struct bfd_link_hash_entry*) NULL 706 && h->type == bfd_link_hash_defined) 707 pinfo->bank_physical = (h->u.def.value 708 + h->u.def.section->output_section->vma 709 + h->u.def.section->output_offset); 710 711 h = bfd_link_hash_lookup (info->hash, BFD_M68HC11_BANK_VIRTUAL_NAME, 712 FALSE, FALSE, TRUE); 713 if (h != (struct bfd_link_hash_entry*) NULL 714 && h->type == bfd_link_hash_defined) 715 pinfo->bank_virtual = (h->u.def.value 716 + h->u.def.section->output_section->vma 717 + h->u.def.section->output_offset); 718 719 h = bfd_link_hash_lookup (info->hash, BFD_M68HC11_BANK_SIZE_NAME, 720 FALSE, FALSE, TRUE); 721 if (h != (struct bfd_link_hash_entry*) NULL 722 && h->type == bfd_link_hash_defined) 723 pinfo->bank_size = (h->u.def.value 724 + h->u.def.section->output_section->vma 725 + h->u.def.section->output_offset); 726 727 pinfo->bank_shift = 0; 728 for (i = pinfo->bank_size; i != 0; i >>= 1) 729 pinfo->bank_shift++; 730 pinfo->bank_shift--; 731 pinfo->bank_mask = (1 << pinfo->bank_shift) - 1; 732 pinfo->bank_physical_end = pinfo->bank_physical + pinfo->bank_size; 733 pinfo->bank_param_initialized = 1; 734 735 h = bfd_link_hash_lookup (info->hash, "__far_trampoline", FALSE, 736 FALSE, TRUE); 737 if (h != (struct bfd_link_hash_entry*) NULL 738 && h->type == bfd_link_hash_defined) 739 pinfo->trampoline_addr = (h->u.def.value 740 + h->u.def.section->output_section->vma 741 + h->u.def.section->output_offset); 742 } 743 744 /* Return 1 if the address is in banked memory. 745 This can be applied to a virtual address and to a physical address. */ 746 int 747 m68hc11_addr_is_banked (struct m68hc11_page_info *pinfo, bfd_vma addr) 748 { 749 if (addr >= pinfo->bank_virtual) 750 return 1; 751 752 if (addr >= pinfo->bank_physical && addr <= pinfo->bank_physical_end) 753 return 1; 754 755 return 0; 756 } 757 758 /* Return the physical address seen by the processor, taking 759 into account banked memory. */ 760 bfd_vma 761 m68hc11_phys_addr (struct m68hc11_page_info *pinfo, bfd_vma addr) 762 { 763 if (addr < pinfo->bank_virtual) 764 return addr; 765 766 /* Map the address to the memory bank. */ 767 addr -= pinfo->bank_virtual; 768 addr &= pinfo->bank_mask; 769 addr += pinfo->bank_physical; 770 return addr; 771 } 772 773 /* Return the page number corresponding to an address in banked memory. */ 774 bfd_vma 775 m68hc11_phys_page (struct m68hc11_page_info *pinfo, bfd_vma addr) 776 { 777 if (addr < pinfo->bank_virtual) 778 return 0; 779 780 /* Map the address to the memory bank. */ 781 addr -= pinfo->bank_virtual; 782 addr >>= pinfo->bank_shift; 783 addr &= 0x0ff; 784 return addr; 785 } 786 787 /* This function is used for relocs which are only used for relaxing, 788 which the linker should otherwise ignore. */ 789 790 bfd_reloc_status_type 791 m68hc11_elf_ignore_reloc (bfd *abfd ATTRIBUTE_UNUSED, 792 arelent *reloc_entry, 793 asymbol *symbol ATTRIBUTE_UNUSED, 794 void *data ATTRIBUTE_UNUSED, 795 asection *input_section, 796 bfd *output_bfd, 797 char **error_message ATTRIBUTE_UNUSED) 798 { 799 if (output_bfd != NULL) 800 reloc_entry->address += input_section->output_offset; 801 return bfd_reloc_ok; 802 } 803 804 bfd_reloc_status_type 805 m68hc11_elf_special_reloc (bfd *abfd ATTRIBUTE_UNUSED, 806 arelent *reloc_entry, 807 asymbol *symbol, 808 void *data ATTRIBUTE_UNUSED, 809 asection *input_section, 810 bfd *output_bfd, 811 char **error_message ATTRIBUTE_UNUSED) 812 { 813 if (output_bfd != (bfd *) NULL 814 && (symbol->flags & BSF_SECTION_SYM) == 0 815 && (! reloc_entry->howto->partial_inplace 816 || reloc_entry->addend == 0)) 817 { 818 reloc_entry->address += input_section->output_offset; 819 return bfd_reloc_ok; 820 } 821 822 if (output_bfd != NULL) 823 return bfd_reloc_continue; 824 825 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 826 return bfd_reloc_outofrange; 827 828 abort(); 829 } 830 831 /* Look through the relocs for a section during the first phase. 832 Since we don't do .gots or .plts, we just need to consider the 833 virtual table relocs for gc. */ 834 835 bfd_boolean 836 elf32_m68hc11_check_relocs (bfd *abfd, struct bfd_link_info *info, 837 asection *sec, const Elf_Internal_Rela *relocs) 838 { 839 Elf_Internal_Shdr * symtab_hdr; 840 struct elf_link_hash_entry ** sym_hashes; 841 const Elf_Internal_Rela * rel; 842 const Elf_Internal_Rela * rel_end; 843 844 if (info->relocatable) 845 return TRUE; 846 847 symtab_hdr = & elf_tdata (abfd)->symtab_hdr; 848 sym_hashes = elf_sym_hashes (abfd); 849 rel_end = relocs + sec->reloc_count; 850 851 for (rel = relocs; rel < rel_end; rel++) 852 { 853 struct elf_link_hash_entry * h; 854 unsigned long r_symndx; 855 856 r_symndx = ELF32_R_SYM (rel->r_info); 857 858 if (r_symndx < symtab_hdr->sh_info) 859 h = NULL; 860 else 861 { 862 h = sym_hashes [r_symndx - symtab_hdr->sh_info]; 863 while (h->root.type == bfd_link_hash_indirect 864 || h->root.type == bfd_link_hash_warning) 865 h = (struct elf_link_hash_entry *) h->root.u.i.link; 866 } 867 868 switch (ELF32_R_TYPE (rel->r_info)) 869 { 870 /* This relocation describes the C++ object vtable hierarchy. 871 Reconstruct it for later use during GC. */ 872 case R_M68HC11_GNU_VTINHERIT: 873 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 874 return FALSE; 875 break; 876 877 /* This relocation describes which C++ vtable entries are actually 878 used. Record for later use during GC. */ 879 case R_M68HC11_GNU_VTENTRY: 880 BFD_ASSERT (h != NULL); 881 if (h != NULL 882 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 883 return FALSE; 884 break; 885 } 886 } 887 888 return TRUE; 889 } 890 891 /* Relocate a 68hc11/68hc12 ELF section. */ 892 bfd_boolean 893 elf32_m68hc11_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 894 struct bfd_link_info *info, 895 bfd *input_bfd, asection *input_section, 896 bfd_byte *contents, Elf_Internal_Rela *relocs, 897 Elf_Internal_Sym *local_syms, 898 asection **local_sections) 899 { 900 Elf_Internal_Shdr *symtab_hdr; 901 struct elf_link_hash_entry **sym_hashes; 902 Elf_Internal_Rela *rel, *relend; 903 const char *name = NULL; 904 struct m68hc11_page_info *pinfo; 905 const struct elf_backend_data * const ebd = get_elf_backend_data (input_bfd); 906 struct m68hc11_elf_link_hash_table *htab; 907 908 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 909 sym_hashes = elf_sym_hashes (input_bfd); 910 911 htab = m68hc11_elf_hash_table (info); 912 if (htab == NULL) 913 return FALSE; 914 915 /* Get memory bank parameters. */ 916 m68hc11_elf_get_bank_parameters (info); 917 918 pinfo = & htab->pinfo; 919 rel = relocs; 920 relend = relocs + input_section->reloc_count; 921 922 for (; rel < relend; rel++) 923 { 924 int r_type; 925 arelent arel; 926 reloc_howto_type *howto; 927 unsigned long r_symndx; 928 Elf_Internal_Sym *sym; 929 asection *sec; 930 bfd_vma relocation = 0; 931 bfd_reloc_status_type r = bfd_reloc_undefined; 932 bfd_vma phys_page; 933 bfd_vma phys_addr; 934 bfd_vma insn_addr; 935 bfd_vma insn_page; 936 bfd_boolean is_far = FALSE; 937 struct elf_link_hash_entry *h; 938 939 r_symndx = ELF32_R_SYM (rel->r_info); 940 r_type = ELF32_R_TYPE (rel->r_info); 941 942 if (r_type == R_M68HC11_GNU_VTENTRY 943 || r_type == R_M68HC11_GNU_VTINHERIT ) 944 continue; 945 946 (*ebd->elf_info_to_howto_rel) (input_bfd, &arel, rel); 947 howto = arel.howto; 948 949 h = NULL; 950 sym = NULL; 951 sec = NULL; 952 if (r_symndx < symtab_hdr->sh_info) 953 { 954 sym = local_syms + r_symndx; 955 sec = local_sections[r_symndx]; 956 relocation = (sec->output_section->vma 957 + sec->output_offset 958 + sym->st_value); 959 is_far = (sym && (sym->st_other & STO_M68HC12_FAR)); 960 } 961 else 962 { 963 bfd_boolean unresolved_reloc, warned; 964 965 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 966 r_symndx, symtab_hdr, sym_hashes, 967 h, sec, relocation, unresolved_reloc, 968 warned); 969 970 is_far = (h && (h->other & STO_M68HC12_FAR)); 971 } 972 973 if (sec != NULL && elf_discarded_section (sec)) 974 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 975 rel, relend, howto, contents); 976 977 if (info->relocatable) 978 { 979 /* This is a relocatable link. We don't have to change 980 anything, unless the reloc is against a section symbol, 981 in which case we have to adjust according to where the 982 section symbol winds up in the output section. */ 983 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 984 rel->r_addend += sec->output_offset; 985 continue; 986 } 987 988 if (h != NULL) 989 name = h->root.root.string; 990 else 991 { 992 name = (bfd_elf_string_from_elf_section 993 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 994 if (name == NULL || *name == '\0') 995 name = bfd_section_name (input_bfd, sec); 996 } 997 998 if (is_far && ELF32_R_TYPE (rel->r_info) == R_M68HC11_16) 999 { 1000 struct elf32_m68hc11_stub_hash_entry* stub; 1001 1002 stub = m68hc12_stub_hash_lookup (htab->stub_hash_table, 1003 name, FALSE, FALSE); 1004 if (stub) 1005 { 1006 relocation = stub->stub_offset 1007 + stub->stub_sec->output_section->vma 1008 + stub->stub_sec->output_offset; 1009 is_far = FALSE; 1010 } 1011 } 1012 1013 /* Do the memory bank mapping. */ 1014 phys_addr = m68hc11_phys_addr (pinfo, relocation + rel->r_addend); 1015 phys_page = m68hc11_phys_page (pinfo, relocation + rel->r_addend); 1016 switch (r_type) 1017 { 1018 case R_M68HC11_24: 1019 /* Reloc used by 68HC12 call instruction. */ 1020 bfd_put_16 (input_bfd, phys_addr, 1021 (bfd_byte*) contents + rel->r_offset); 1022 bfd_put_8 (input_bfd, phys_page, 1023 (bfd_byte*) contents + rel->r_offset + 2); 1024 r = bfd_reloc_ok; 1025 r_type = R_M68HC11_NONE; 1026 break; 1027 1028 case R_M68HC11_NONE: 1029 r = bfd_reloc_ok; 1030 break; 1031 1032 case R_M68HC11_LO16: 1033 /* Reloc generated by %addr(expr) gas to obtain the 1034 address as mapped in the memory bank window. */ 1035 relocation = phys_addr; 1036 break; 1037 1038 case R_M68HC11_PAGE: 1039 /* Reloc generated by %page(expr) gas to obtain the 1040 page number associated with the address. */ 1041 relocation = phys_page; 1042 break; 1043 1044 case R_M68HC11_16: 1045 /* Get virtual address of instruction having the relocation. */ 1046 if (is_far) 1047 { 1048 const char* msg; 1049 char* buf; 1050 msg = _("Reference to the far symbol `%s' using a wrong " 1051 "relocation may result in incorrect execution"); 1052 buf = alloca (strlen (msg) + strlen (name) + 10); 1053 sprintf (buf, msg, name); 1054 1055 (* info->callbacks->warning) 1056 (info, buf, name, input_bfd, NULL, rel->r_offset); 1057 } 1058 1059 /* Get virtual address of instruction having the relocation. */ 1060 insn_addr = input_section->output_section->vma 1061 + input_section->output_offset 1062 + rel->r_offset; 1063 1064 insn_page = m68hc11_phys_page (pinfo, insn_addr); 1065 1066 if (m68hc11_addr_is_banked (pinfo, relocation + rel->r_addend) 1067 && m68hc11_addr_is_banked (pinfo, insn_addr) 1068 && phys_page != insn_page) 1069 { 1070 const char* msg; 1071 char* buf; 1072 1073 msg = _("banked address [%lx:%04lx] (%lx) is not in the same bank " 1074 "as current banked address [%lx:%04lx] (%lx)"); 1075 1076 buf = alloca (strlen (msg) + 128); 1077 sprintf (buf, msg, phys_page, phys_addr, 1078 (long) (relocation + rel->r_addend), 1079 insn_page, m68hc11_phys_addr (pinfo, insn_addr), 1080 (long) (insn_addr)); 1081 if (!((*info->callbacks->warning) 1082 (info, buf, name, input_bfd, input_section, 1083 rel->r_offset))) 1084 return FALSE; 1085 break; 1086 } 1087 if (phys_page != 0 && insn_page == 0) 1088 { 1089 const char* msg; 1090 char* buf; 1091 1092 msg = _("reference to a banked address [%lx:%04lx] in the " 1093 "normal address space at %04lx"); 1094 1095 buf = alloca (strlen (msg) + 128); 1096 sprintf (buf, msg, phys_page, phys_addr, insn_addr); 1097 if (!((*info->callbacks->warning) 1098 (info, buf, name, input_bfd, input_section, 1099 insn_addr))) 1100 return FALSE; 1101 1102 relocation = phys_addr; 1103 break; 1104 } 1105 1106 /* If this is a banked address use the phys_addr so that 1107 we stay in the banked window. */ 1108 if (m68hc11_addr_is_banked (pinfo, relocation + rel->r_addend)) 1109 relocation = phys_addr; 1110 break; 1111 } 1112 if (r_type != R_M68HC11_NONE) 1113 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1114 contents, rel->r_offset, 1115 relocation, rel->r_addend); 1116 1117 if (r != bfd_reloc_ok) 1118 { 1119 const char * msg = (const char *) 0; 1120 1121 switch (r) 1122 { 1123 case bfd_reloc_overflow: 1124 if (!((*info->callbacks->reloc_overflow) 1125 (info, NULL, name, howto->name, (bfd_vma) 0, 1126 input_bfd, input_section, rel->r_offset))) 1127 return FALSE; 1128 break; 1129 1130 case bfd_reloc_undefined: 1131 if (!((*info->callbacks->undefined_symbol) 1132 (info, name, input_bfd, input_section, 1133 rel->r_offset, TRUE))) 1134 return FALSE; 1135 break; 1136 1137 case bfd_reloc_outofrange: 1138 msg = _ ("internal error: out of range error"); 1139 goto common_error; 1140 1141 case bfd_reloc_notsupported: 1142 msg = _ ("internal error: unsupported relocation error"); 1143 goto common_error; 1144 1145 case bfd_reloc_dangerous: 1146 msg = _ ("internal error: dangerous error"); 1147 goto common_error; 1148 1149 default: 1150 msg = _ ("internal error: unknown error"); 1151 /* fall through */ 1152 1153 common_error: 1154 if (!((*info->callbacks->warning) 1155 (info, msg, name, input_bfd, input_section, 1156 rel->r_offset))) 1157 return FALSE; 1158 break; 1159 } 1160 } 1161 } 1162 1163 return TRUE; 1164 } 1165 1166 1167 1168 /* Set and control ELF flags in ELF header. */ 1170 1171 bfd_boolean 1172 _bfd_m68hc11_elf_set_private_flags (bfd *abfd, flagword flags) 1173 { 1174 BFD_ASSERT (!elf_flags_init (abfd) 1175 || elf_elfheader (abfd)->e_flags == flags); 1176 1177 elf_elfheader (abfd)->e_flags = flags; 1178 elf_flags_init (abfd) = TRUE; 1179 return TRUE; 1180 } 1181 1182 /* Merge backend specific data from an object file to the output 1183 object file when linking. */ 1184 1185 bfd_boolean 1186 _bfd_m68hc11_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 1187 { 1188 flagword old_flags; 1189 flagword new_flags; 1190 bfd_boolean ok = TRUE; 1191 1192 /* Check if we have the same endianess */ 1193 if (!_bfd_generic_verify_endian_match (ibfd, obfd)) 1194 return FALSE; 1195 1196 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1197 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1198 return TRUE; 1199 1200 new_flags = elf_elfheader (ibfd)->e_flags; 1201 elf_elfheader (obfd)->e_flags |= new_flags & EF_M68HC11_ABI; 1202 old_flags = elf_elfheader (obfd)->e_flags; 1203 1204 if (! elf_flags_init (obfd)) 1205 { 1206 elf_flags_init (obfd) = TRUE; 1207 elf_elfheader (obfd)->e_flags = new_flags; 1208 elf_elfheader (obfd)->e_ident[EI_CLASS] 1209 = elf_elfheader (ibfd)->e_ident[EI_CLASS]; 1210 1211 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) 1212 && bfd_get_arch_info (obfd)->the_default) 1213 { 1214 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), 1215 bfd_get_mach (ibfd))) 1216 return FALSE; 1217 } 1218 1219 return TRUE; 1220 } 1221 1222 /* Check ABI compatibility. */ 1223 if ((new_flags & E_M68HC11_I32) != (old_flags & E_M68HC11_I32)) 1224 { 1225 (*_bfd_error_handler) 1226 (_("%B: linking files compiled for 16-bit integers (-mshort) " 1227 "and others for 32-bit integers"), ibfd); 1228 ok = FALSE; 1229 } 1230 if ((new_flags & E_M68HC11_F64) != (old_flags & E_M68HC11_F64)) 1231 { 1232 (*_bfd_error_handler) 1233 (_("%B: linking files compiled for 32-bit double (-fshort-double) " 1234 "and others for 64-bit double"), ibfd); 1235 ok = FALSE; 1236 } 1237 1238 /* Processor compatibility. */ 1239 if (!EF_M68HC11_CAN_MERGE_MACH (new_flags, old_flags)) 1240 { 1241 (*_bfd_error_handler) 1242 (_("%B: linking files compiled for HCS12 with " 1243 "others compiled for HC12"), ibfd); 1244 ok = FALSE; 1245 } 1246 new_flags = ((new_flags & ~EF_M68HC11_MACH_MASK) 1247 | (EF_M68HC11_MERGE_MACH (new_flags, old_flags))); 1248 1249 elf_elfheader (obfd)->e_flags = new_flags; 1250 1251 new_flags &= ~(EF_M68HC11_ABI | EF_M68HC11_MACH_MASK); 1252 old_flags &= ~(EF_M68HC11_ABI | EF_M68HC11_MACH_MASK); 1253 1254 /* Warn about any other mismatches */ 1255 if (new_flags != old_flags) 1256 { 1257 (*_bfd_error_handler) 1258 (_("%B: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"), 1259 ibfd, (unsigned long) new_flags, (unsigned long) old_flags); 1260 ok = FALSE; 1261 } 1262 1263 if (! ok) 1264 { 1265 bfd_set_error (bfd_error_bad_value); 1266 return FALSE; 1267 } 1268 1269 return TRUE; 1270 } 1271 1272 bfd_boolean 1273 _bfd_m68hc11_elf_print_private_bfd_data (bfd *abfd, void *ptr) 1274 { 1275 FILE *file = (FILE *) ptr; 1276 1277 BFD_ASSERT (abfd != NULL && ptr != NULL); 1278 1279 /* Print normal ELF private data. */ 1280 _bfd_elf_print_private_bfd_data (abfd, ptr); 1281 1282 /* xgettext:c-format */ 1283 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 1284 1285 if (elf_elfheader (abfd)->e_flags & E_M68HC11_I32) 1286 fprintf (file, _("[abi=32-bit int, ")); 1287 else 1288 fprintf (file, _("[abi=16-bit int, ")); 1289 1290 if (elf_elfheader (abfd)->e_flags & E_M68HC11_F64) 1291 fprintf (file, _("64-bit double, ")); 1292 else 1293 fprintf (file, _("32-bit double, ")); 1294 1295 if (strcmp (bfd_get_target (abfd), "elf32-m68hc11") == 0) 1296 fprintf (file, _("cpu=HC11]")); 1297 else if (elf_elfheader (abfd)->e_flags & EF_M68HCS12_MACH) 1298 fprintf (file, _("cpu=HCS12]")); 1299 else 1300 fprintf (file, _("cpu=HC12]")); 1301 1302 if (elf_elfheader (abfd)->e_flags & E_M68HC12_BANKS) 1303 fprintf (file, _(" [memory=bank-model]")); 1304 else 1305 fprintf (file, _(" [memory=flat]")); 1306 1307 fputc ('\n', file); 1308 1309 return TRUE; 1310 } 1311 1312 static void scan_sections_for_abi (bfd *abfd ATTRIBUTE_UNUSED, 1313 asection *asect, void *arg) 1314 { 1315 struct m68hc11_scan_param* p = (struct m68hc11_scan_param*) arg; 1316 1317 if (asect->vma >= p->pinfo->bank_virtual) 1318 p->use_memory_banks = TRUE; 1319 } 1320 1321 /* Tweak the OSABI field of the elf header. */ 1322 1323 void 1324 elf32_m68hc11_post_process_headers (bfd *abfd, struct bfd_link_info *link_info) 1325 { 1326 struct m68hc11_scan_param param; 1327 struct m68hc11_elf_link_hash_table *htab; 1328 1329 if (link_info == NULL) 1330 return; 1331 1332 htab = m68hc11_elf_hash_table (link_info); 1333 if (htab == NULL) 1334 return; 1335 1336 m68hc11_elf_get_bank_parameters (link_info); 1337 1338 param.use_memory_banks = FALSE; 1339 param.pinfo = & htab->pinfo; 1340 1341 bfd_map_over_sections (abfd, scan_sections_for_abi, ¶m); 1342 1343 if (param.use_memory_banks) 1344 { 1345 Elf_Internal_Ehdr * i_ehdrp; 1346 1347 i_ehdrp = elf_elfheader (abfd); 1348 i_ehdrp->e_flags |= E_M68HC12_BANKS; 1349 } 1350 } 1351
Indexes created Sat Feb 28 05:31:39 UTC 2026