| 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, 2011, 2012 Free Software Foundation, Inc. |
| 4 | Contributed by Stephane Carrez (stcarrez@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 "sysdep.h" |
| 24 | #include "alloca-conf.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*, void *); |
| 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 | /* Merge non-visibility st_other attributes, STO_M68HC12_FAR and |
| 218 | STO_M68HC12_INTERRUPT. */ |
| 219 | |
| 220 | void |
| 221 | elf32_m68hc11_merge_symbol_attribute (struct elf_link_hash_entry *h, |
| 222 | const Elf_Internal_Sym *isym, |
| 223 | bfd_boolean definition, |
| 224 | bfd_boolean dynamic ATTRIBUTE_UNUSED) |
| 225 | { |
| 226 | if (definition) |
| 227 | h->other = ((isym->st_other & ~ELF_ST_VISIBILITY (-1)) |
| 228 | | ELF_ST_VISIBILITY (h->other)); |
| 229 | } |
| 230 | |
| 231 | /* External entry points for sizing and building linker stubs. */ |
| 232 | |
| 233 | /* Set up various things so that we can make a list of input sections |
| 234 | for each output section included in the link. Returns -1 on error, |
| 235 | 0 when no stubs will be needed, and 1 on success. */ |
| 236 | |
| 237 | int |
| 238 | elf32_m68hc11_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info) |
| 239 | { |
| 240 | bfd *input_bfd; |
| 241 | unsigned int bfd_count; |
| 242 | int top_id, top_index; |
| 243 | asection *section; |
| 244 | asection **input_list, **list; |
| 245 | bfd_size_type amt; |
| 246 | asection *text_section; |
| 247 | struct m68hc11_elf_link_hash_table *htab; |
| 248 | |
| 249 | htab = m68hc11_elf_hash_table (info); |
| 250 | if (htab == NULL) |
| 251 | return -1; |
| 252 | |
| 253 | if (bfd_get_flavour (info->output_bfd) != bfd_target_elf_flavour) |
| 254 | return 0; |
| 255 | |
| 256 | /* Count the number of input BFDs and find the top input section id. |
| 257 | Also search for an existing ".tramp" section so that we know |
| 258 | where generated trampolines must go. Default to ".text" if we |
| 259 | can't find it. */ |
| 260 | htab->tramp_section = 0; |
| 261 | text_section = 0; |
| 262 | for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; |
| 263 | input_bfd != NULL; |
| 264 | input_bfd = input_bfd->link_next) |
| 265 | { |
| 266 | bfd_count += 1; |
| 267 | for (section = input_bfd->sections; |
| 268 | section != NULL; |
| 269 | section = section->next) |
| 270 | { |
| 271 | const char* name = bfd_get_section_name (input_bfd, section); |
| 272 | |
| 273 | if (!strcmp (name, ".tramp")) |
| 274 | htab->tramp_section = section; |
| 275 | |
| 276 | if (!strcmp (name, ".text")) |
| 277 | text_section = section; |
| 278 | |
| 279 | if (top_id < section->id) |
| 280 | top_id = section->id; |
| 281 | } |
| 282 | } |
| 283 | htab->bfd_count = bfd_count; |
| 284 | if (htab->tramp_section == 0) |
| 285 | htab->tramp_section = text_section; |
| 286 | |
| 287 | /* We can't use output_bfd->section_count here to find the top output |
| 288 | section index as some sections may have been removed, and |
| 289 | strip_excluded_output_sections doesn't renumber the indices. */ |
| 290 | for (section = output_bfd->sections, top_index = 0; |
| 291 | section != NULL; |
| 292 | section = section->next) |
| 293 | { |
| 294 | if (top_index < section->index) |
| 295 | top_index = section->index; |
| 296 | } |
| 297 | |
| 298 | htab->top_index = top_index; |
| 299 | amt = sizeof (asection *) * (top_index + 1); |
| 300 | input_list = (asection **) bfd_malloc (amt); |
| 301 | htab->input_list = input_list; |
| 302 | if (input_list == NULL) |
| 303 | return -1; |
| 304 | |
| 305 | /* For sections we aren't interested in, mark their entries with a |
| 306 | value we can check later. */ |
| 307 | list = input_list + top_index; |
| 308 | do |
| 309 | *list = bfd_abs_section_ptr; |
| 310 | while (list-- != input_list); |
| 311 | |
| 312 | for (section = output_bfd->sections; |
| 313 | section != NULL; |
| 314 | section = section->next) |
| 315 | { |
| 316 | if ((section->flags & SEC_CODE) != 0) |
| 317 | input_list[section->index] = NULL; |
| 318 | } |
| 319 | |
| 320 | return 1; |
| 321 | } |
| 322 | |
| 323 | /* Determine and set the size of the stub section for a final link. |
| 324 | |
| 325 | The basic idea here is to examine all the relocations looking for |
| 326 | PC-relative calls to a target that is unreachable with a "bl" |
| 327 | instruction. */ |
| 328 | |
| 329 | bfd_boolean |
| 330 | elf32_m68hc11_size_stubs (bfd *output_bfd, bfd *stub_bfd, |
| 331 | struct bfd_link_info *info, |
| 332 | asection * (*add_stub_section) (const char*, asection*)) |
| 333 | { |
| 334 | bfd *input_bfd; |
| 335 | asection *section; |
| 336 | Elf_Internal_Sym *local_syms, **all_local_syms; |
| 337 | unsigned int bfd_indx, bfd_count; |
| 338 | bfd_size_type amt; |
| 339 | asection *stub_sec; |
| 340 | struct m68hc11_elf_link_hash_table *htab = m68hc11_elf_hash_table (info); |
| 341 | |
| 342 | if (htab == NULL) |
| 343 | return FALSE; |
| 344 | |
| 345 | /* Stash our params away. */ |
| 346 | htab->stub_bfd = stub_bfd; |
| 347 | htab->add_stub_section = add_stub_section; |
| 348 | |
| 349 | /* Count the number of input BFDs and find the top input section id. */ |
| 350 | for (input_bfd = info->input_bfds, bfd_count = 0; |
| 351 | input_bfd != NULL; |
| 352 | input_bfd = input_bfd->link_next) |
| 353 | bfd_count += 1; |
| 354 | |
| 355 | /* We want to read in symbol extension records only once. To do this |
| 356 | we need to read in the local symbols in parallel and save them for |
| 357 | later use; so hold pointers to the local symbols in an array. */ |
| 358 | amt = sizeof (Elf_Internal_Sym *) * bfd_count; |
| 359 | all_local_syms = (Elf_Internal_Sym **) bfd_zmalloc (amt); |
| 360 | if (all_local_syms == NULL) |
| 361 | return FALSE; |
| 362 | |
| 363 | /* Walk over all the input BFDs, swapping in local symbols. */ |
| 364 | for (input_bfd = info->input_bfds, bfd_indx = 0; |
| 365 | input_bfd != NULL; |
| 366 | input_bfd = input_bfd->link_next, bfd_indx++) |
| 367 | { |
| 368 | Elf_Internal_Shdr *symtab_hdr; |
| 369 | |
| 370 | /* We'll need the symbol table in a second. */ |
| 371 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 372 | if (symtab_hdr->sh_info == 0) |
| 373 | continue; |
| 374 | |
| 375 | /* We need an array of the local symbols attached to the input bfd. */ |
| 376 | local_syms = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 377 | if (local_syms == NULL) |
| 378 | { |
| 379 | local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, |
| 380 | symtab_hdr->sh_info, 0, |
| 381 | NULL, NULL, NULL); |
| 382 | /* Cache them for elf_link_input_bfd. */ |
| 383 | symtab_hdr->contents = (unsigned char *) local_syms; |
| 384 | } |
| 385 | if (local_syms == NULL) |
| 386 | { |
| 387 | free (all_local_syms); |
| 388 | return FALSE; |
| 389 | } |
| 390 | |
| 391 | all_local_syms[bfd_indx] = local_syms; |
| 392 | } |
| 393 | |
| 394 | for (input_bfd = info->input_bfds, bfd_indx = 0; |
| 395 | input_bfd != NULL; |
| 396 | input_bfd = input_bfd->link_next, bfd_indx++) |
| 397 | { |
| 398 | Elf_Internal_Shdr *symtab_hdr; |
| 399 | struct elf_link_hash_entry ** sym_hashes; |
| 400 | |
| 401 | sym_hashes = elf_sym_hashes (input_bfd); |
| 402 | |
| 403 | /* We'll need the symbol table in a second. */ |
| 404 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 405 | if (symtab_hdr->sh_info == 0) |
| 406 | continue; |
| 407 | |
| 408 | local_syms = all_local_syms[bfd_indx]; |
| 409 | |
| 410 | /* Walk over each section attached to the input bfd. */ |
| 411 | for (section = input_bfd->sections; |
| 412 | section != NULL; |
| 413 | section = section->next) |
| 414 | { |
| 415 | Elf_Internal_Rela *internal_relocs, *irelaend, *irela; |
| 416 | |
| 417 | /* If there aren't any relocs, then there's nothing more |
| 418 | to do. */ |
| 419 | if ((section->flags & SEC_RELOC) == 0 |
| 420 | || section->reloc_count == 0) |
| 421 | continue; |
| 422 | |
| 423 | /* If this section is a link-once section that will be |
| 424 | discarded, then don't create any stubs. */ |
| 425 | if (section->output_section == NULL |
| 426 | || section->output_section->owner != output_bfd) |
| 427 | continue; |
| 428 | |
| 429 | /* Get the relocs. */ |
| 430 | internal_relocs |
| 431 | = _bfd_elf_link_read_relocs (input_bfd, section, NULL, |
| 432 | (Elf_Internal_Rela *) NULL, |
| 433 | info->keep_memory); |
| 434 | if (internal_relocs == NULL) |
| 435 | goto error_ret_free_local; |
| 436 | |
| 437 | /* Now examine each relocation. */ |
| 438 | irela = internal_relocs; |
| 439 | irelaend = irela + section->reloc_count; |
| 440 | for (; irela < irelaend; irela++) |
| 441 | { |
| 442 | unsigned int r_type, r_indx; |
| 443 | struct elf32_m68hc11_stub_hash_entry *stub_entry; |
| 444 | asection *sym_sec; |
| 445 | bfd_vma sym_value; |
| 446 | struct elf_link_hash_entry *hash; |
| 447 | const char *stub_name; |
| 448 | Elf_Internal_Sym *sym; |
| 449 | |
| 450 | r_type = ELF32_R_TYPE (irela->r_info); |
| 451 | |
| 452 | /* Only look at 16-bit relocs. */ |
| 453 | if (r_type != (unsigned int) R_M68HC11_16) |
| 454 | continue; |
| 455 | |
| 456 | /* Now determine the call target, its name, value, |
| 457 | section. */ |
| 458 | r_indx = ELF32_R_SYM (irela->r_info); |
| 459 | if (r_indx < symtab_hdr->sh_info) |
| 460 | { |
| 461 | /* It's a local symbol. */ |
| 462 | Elf_Internal_Shdr *hdr; |
| 463 | bfd_boolean is_far; |
| 464 | |
| 465 | sym = local_syms + r_indx; |
| 466 | is_far = (sym && (sym->st_other & STO_M68HC12_FAR)); |
| 467 | if (!is_far) |
| 468 | continue; |
| 469 | |
| 470 | if (sym->st_shndx >= elf_numsections (input_bfd)) |
| 471 | sym_sec = NULL; |
| 472 | else |
| 473 | { |
| 474 | hdr = elf_elfsections (input_bfd)[sym->st_shndx]; |
| 475 | sym_sec = hdr->bfd_section; |
| 476 | } |
| 477 | stub_name = (bfd_elf_string_from_elf_section |
| 478 | (input_bfd, symtab_hdr->sh_link, |
| 479 | sym->st_name)); |
| 480 | sym_value = sym->st_value; |
| 481 | hash = NULL; |
| 482 | } |
| 483 | else |
| 484 | { |
| 485 | /* It's an external symbol. */ |
| 486 | int e_indx; |
| 487 | |
| 488 | e_indx = r_indx - symtab_hdr->sh_info; |
| 489 | hash = (struct elf_link_hash_entry *) |
| 490 | (sym_hashes[e_indx]); |
| 491 | |
| 492 | while (hash->root.type == bfd_link_hash_indirect |
| 493 | || hash->root.type == bfd_link_hash_warning) |
| 494 | hash = ((struct elf_link_hash_entry *) |
| 495 | hash->root.u.i.link); |
| 496 | |
| 497 | if (hash->root.type == bfd_link_hash_defined |
| 498 | || hash->root.type == bfd_link_hash_defweak |
| 499 | || hash->root.type == bfd_link_hash_new) |
| 500 | { |
| 501 | if (!(hash->other & STO_M68HC12_FAR)) |
| 502 | continue; |
| 503 | } |
| 504 | else if (hash->root.type == bfd_link_hash_undefweak) |
| 505 | { |
| 506 | continue; |
| 507 | } |
| 508 | else if (hash->root.type == bfd_link_hash_undefined) |
| 509 | { |
| 510 | continue; |
| 511 | } |
| 512 | else |
| 513 | { |
| 514 | bfd_set_error (bfd_error_bad_value); |
| 515 | goto error_ret_free_internal; |
| 516 | } |
| 517 | sym_sec = hash->root.u.def.section; |
| 518 | sym_value = hash->root.u.def.value; |
| 519 | stub_name = hash->root.root.string; |
| 520 | } |
| 521 | |
| 522 | if (!stub_name) |
| 523 | goto error_ret_free_internal; |
| 524 | |
| 525 | stub_entry = m68hc12_stub_hash_lookup |
| 526 | (htab->stub_hash_table, |
| 527 | stub_name, |
| 528 | FALSE, FALSE); |
| 529 | if (stub_entry == NULL) |
| 530 | { |
| 531 | if (add_stub_section == 0) |
| 532 | continue; |
| 533 | |
| 534 | stub_entry = m68hc12_add_stub (stub_name, section, htab); |
| 535 | if (stub_entry == NULL) |
| 536 | { |
| 537 | error_ret_free_internal: |
| 538 | if (elf_section_data (section)->relocs == NULL) |
| 539 | free (internal_relocs); |
| 540 | goto error_ret_free_local; |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | stub_entry->target_value = sym_value; |
| 545 | stub_entry->target_section = sym_sec; |
| 546 | } |
| 547 | |
| 548 | /* We're done with the internal relocs, free them. */ |
| 549 | if (elf_section_data (section)->relocs == NULL) |
| 550 | free (internal_relocs); |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | if (add_stub_section) |
| 555 | { |
| 556 | /* OK, we've added some stubs. Find out the new size of the |
| 557 | stub sections. */ |
| 558 | for (stub_sec = htab->stub_bfd->sections; |
| 559 | stub_sec != NULL; |
| 560 | stub_sec = stub_sec->next) |
| 561 | { |
| 562 | stub_sec->size = 0; |
| 563 | } |
| 564 | |
| 565 | bfd_hash_traverse (htab->stub_hash_table, htab->size_one_stub, htab); |
| 566 | } |
| 567 | free (all_local_syms); |
| 568 | return TRUE; |
| 569 | |
| 570 | error_ret_free_local: |
| 571 | free (all_local_syms); |
| 572 | return FALSE; |
| 573 | } |
| 574 | |
| 575 | /* Export the trampoline addresses in the symbol table. */ |
| 576 | static bfd_boolean |
| 577 | m68hc11_elf_export_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) |
| 578 | { |
| 579 | struct bfd_link_info *info; |
| 580 | struct m68hc11_elf_link_hash_table *htab; |
| 581 | struct elf32_m68hc11_stub_hash_entry *stub_entry; |
| 582 | char* name; |
| 583 | bfd_boolean result; |
| 584 | |
| 585 | info = (struct bfd_link_info *) in_arg; |
| 586 | htab = m68hc11_elf_hash_table (info); |
| 587 | if (htab == NULL) |
| 588 | return FALSE; |
| 589 | |
| 590 | /* Massage our args to the form they really have. */ |
| 591 | stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; |
| 592 | |
| 593 | /* Generate the trampoline according to HC11 or HC12. */ |
| 594 | result = (* htab->build_one_stub) (gen_entry, in_arg); |
| 595 | |
| 596 | /* Make a printable name that does not conflict with the real function. */ |
| 597 | name = alloca (strlen (stub_entry->root.string) + 16); |
| 598 | sprintf (name, "tramp.%s", stub_entry->root.string); |
| 599 | |
| 600 | /* Export the symbol for debugging/disassembling. */ |
| 601 | m68hc11_elf_set_symbol (htab->stub_bfd, info, name, |
| 602 | stub_entry->stub_offset, |
| 603 | stub_entry->stub_sec); |
| 604 | return result; |
| 605 | } |
| 606 | |
| 607 | /* Export a symbol or set its value and section. */ |
| 608 | static void |
| 609 | m68hc11_elf_set_symbol (bfd *abfd, struct bfd_link_info *info, |
| 610 | const char *name, bfd_vma value, asection *sec) |
| 611 | { |
| 612 | struct elf_link_hash_entry *h; |
| 613 | |
| 614 | h = (struct elf_link_hash_entry *) |
| 615 | bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, FALSE); |
| 616 | if (h == NULL) |
| 617 | { |
| 618 | _bfd_generic_link_add_one_symbol (info, abfd, |
| 619 | name, |
| 620 | BSF_GLOBAL, |
| 621 | sec, |
| 622 | value, |
| 623 | (const char*) NULL, |
| 624 | TRUE, FALSE, NULL); |
| 625 | } |
| 626 | else |
| 627 | { |
| 628 | h->root.type = bfd_link_hash_defined; |
| 629 | h->root.u.def.value = value; |
| 630 | h->root.u.def.section = sec; |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | |
| 635 | /* Build all the stubs associated with the current output file. The |
| 636 | stubs are kept in a hash table attached to the main linker hash |
| 637 | table. This function is called via m68hc12elf_finish in the |
| 638 | linker. */ |
| 639 | |
| 640 | bfd_boolean |
| 641 | elf32_m68hc11_build_stubs (bfd *abfd, struct bfd_link_info *info) |
| 642 | { |
| 643 | asection *stub_sec; |
| 644 | struct bfd_hash_table *table; |
| 645 | struct m68hc11_elf_link_hash_table *htab; |
| 646 | struct m68hc11_scan_param param; |
| 647 | |
| 648 | m68hc11_elf_get_bank_parameters (info); |
| 649 | htab = m68hc11_elf_hash_table (info); |
| 650 | if (htab == NULL) |
| 651 | return FALSE; |
| 652 | |
| 653 | for (stub_sec = htab->stub_bfd->sections; |
| 654 | stub_sec != NULL; |
| 655 | stub_sec = stub_sec->next) |
| 656 | { |
| 657 | bfd_size_type size; |
| 658 | |
| 659 | /* Allocate memory to hold the linker stubs. */ |
| 660 | size = stub_sec->size; |
| 661 | stub_sec->contents = (unsigned char *) bfd_zalloc (htab->stub_bfd, size); |
| 662 | if (stub_sec->contents == NULL && size != 0) |
| 663 | return FALSE; |
| 664 | stub_sec->size = 0; |
| 665 | } |
| 666 | |
| 667 | /* Build the stubs as directed by the stub hash table. */ |
| 668 | table = htab->stub_hash_table; |
| 669 | bfd_hash_traverse (table, m68hc11_elf_export_one_stub, info); |
| 670 | |
| 671 | /* Scan the output sections to see if we use the memory banks. |
| 672 | If so, export the symbols that define how the memory banks |
| 673 | are mapped. This is used by gdb and the simulator to obtain |
| 674 | the information. It can be used by programs to burn the eprom |
| 675 | at the good addresses. */ |
| 676 | param.use_memory_banks = FALSE; |
| 677 | param.pinfo = &htab->pinfo; |
| 678 | bfd_map_over_sections (abfd, scan_sections_for_abi, ¶m); |
| 679 | if (param.use_memory_banks) |
| 680 | { |
| 681 | m68hc11_elf_set_symbol (abfd, info, BFD_M68HC11_BANK_START_NAME, |
| 682 | htab->pinfo.bank_physical, |
| 683 | bfd_abs_section_ptr); |
| 684 | m68hc11_elf_set_symbol (abfd, info, BFD_M68HC11_BANK_VIRTUAL_NAME, |
| 685 | htab->pinfo.bank_virtual, |
| 686 | bfd_abs_section_ptr); |
| 687 | m68hc11_elf_set_symbol (abfd, info, BFD_M68HC11_BANK_SIZE_NAME, |
| 688 | htab->pinfo.bank_size, |
| 689 | bfd_abs_section_ptr); |
| 690 | } |
| 691 | |
| 692 | return TRUE; |
| 693 | } |
| 694 | |
| 695 | void |
| 696 | m68hc11_elf_get_bank_parameters (struct bfd_link_info *info) |
| 697 | { |
| 698 | unsigned i; |
| 699 | struct m68hc11_page_info *pinfo; |
| 700 | struct bfd_link_hash_entry *h; |
| 701 | struct m68hc11_elf_link_hash_table *htab; |
| 702 | |
| 703 | htab = m68hc11_elf_hash_table (info); |
| 704 | if (htab == NULL) |
| 705 | return; |
| 706 | |
| 707 | pinfo = & htab->pinfo; |
| 708 | if (pinfo->bank_param_initialized) |
| 709 | return; |
| 710 | |
| 711 | pinfo->bank_virtual = M68HC12_BANK_VIRT; |
| 712 | pinfo->bank_mask = M68HC12_BANK_MASK; |
| 713 | pinfo->bank_physical = M68HC12_BANK_BASE; |
| 714 | pinfo->bank_shift = M68HC12_BANK_SHIFT; |
| 715 | pinfo->bank_size = 1 << M68HC12_BANK_SHIFT; |
| 716 | |
| 717 | h = bfd_link_hash_lookup (info->hash, BFD_M68HC11_BANK_START_NAME, |
| 718 | FALSE, FALSE, TRUE); |
| 719 | if (h != (struct bfd_link_hash_entry*) NULL |
| 720 | && h->type == bfd_link_hash_defined) |
| 721 | pinfo->bank_physical = (h->u.def.value |
| 722 | + h->u.def.section->output_section->vma |
| 723 | + h->u.def.section->output_offset); |
| 724 | |
| 725 | h = bfd_link_hash_lookup (info->hash, BFD_M68HC11_BANK_VIRTUAL_NAME, |
| 726 | FALSE, FALSE, TRUE); |
| 727 | if (h != (struct bfd_link_hash_entry*) NULL |
| 728 | && h->type == bfd_link_hash_defined) |
| 729 | pinfo->bank_virtual = (h->u.def.value |
| 730 | + h->u.def.section->output_section->vma |
| 731 | + h->u.def.section->output_offset); |
| 732 | |
| 733 | h = bfd_link_hash_lookup (info->hash, BFD_M68HC11_BANK_SIZE_NAME, |
| 734 | FALSE, FALSE, TRUE); |
| 735 | if (h != (struct bfd_link_hash_entry*) NULL |
| 736 | && h->type == bfd_link_hash_defined) |
| 737 | pinfo->bank_size = (h->u.def.value |
| 738 | + h->u.def.section->output_section->vma |
| 739 | + h->u.def.section->output_offset); |
| 740 | |
| 741 | pinfo->bank_shift = 0; |
| 742 | for (i = pinfo->bank_size; i != 0; i >>= 1) |
| 743 | pinfo->bank_shift++; |
| 744 | pinfo->bank_shift--; |
| 745 | pinfo->bank_mask = (1 << pinfo->bank_shift) - 1; |
| 746 | pinfo->bank_physical_end = pinfo->bank_physical + pinfo->bank_size; |
| 747 | pinfo->bank_param_initialized = 1; |
| 748 | |
| 749 | h = bfd_link_hash_lookup (info->hash, "__far_trampoline", FALSE, |
| 750 | FALSE, TRUE); |
| 751 | if (h != (struct bfd_link_hash_entry*) NULL |
| 752 | && h->type == bfd_link_hash_defined) |
| 753 | pinfo->trampoline_addr = (h->u.def.value |
| 754 | + h->u.def.section->output_section->vma |
| 755 | + h->u.def.section->output_offset); |
| 756 | } |
| 757 | |
| 758 | /* Return 1 if the address is in banked memory. |
| 759 | This can be applied to a virtual address and to a physical address. */ |
| 760 | int |
| 761 | m68hc11_addr_is_banked (struct m68hc11_page_info *pinfo, bfd_vma addr) |
| 762 | { |
| 763 | if (addr >= pinfo->bank_virtual) |
| 764 | return 1; |
| 765 | |
| 766 | if (addr >= pinfo->bank_physical && addr <= pinfo->bank_physical_end) |
| 767 | return 1; |
| 768 | |
| 769 | return 0; |
| 770 | } |
| 771 | |
| 772 | /* Return the physical address seen by the processor, taking |
| 773 | into account banked memory. */ |
| 774 | bfd_vma |
| 775 | m68hc11_phys_addr (struct m68hc11_page_info *pinfo, bfd_vma addr) |
| 776 | { |
| 777 | if (addr < pinfo->bank_virtual) |
| 778 | return addr; |
| 779 | |
| 780 | /* Map the address to the memory bank. */ |
| 781 | addr -= pinfo->bank_virtual; |
| 782 | addr &= pinfo->bank_mask; |
| 783 | addr += pinfo->bank_physical; |
| 784 | return addr; |
| 785 | } |
| 786 | |
| 787 | /* Return the page number corresponding to an address in banked memory. */ |
| 788 | bfd_vma |
| 789 | m68hc11_phys_page (struct m68hc11_page_info *pinfo, bfd_vma addr) |
| 790 | { |
| 791 | if (addr < pinfo->bank_virtual) |
| 792 | return 0; |
| 793 | |
| 794 | /* Map the address to the memory bank. */ |
| 795 | addr -= pinfo->bank_virtual; |
| 796 | addr >>= pinfo->bank_shift; |
| 797 | addr &= 0x0ff; |
| 798 | return addr; |
| 799 | } |
| 800 | |
| 801 | /* This function is used for relocs which are only used for relaxing, |
| 802 | which the linker should otherwise ignore. */ |
| 803 | |
| 804 | bfd_reloc_status_type |
| 805 | m68hc11_elf_ignore_reloc (bfd *abfd ATTRIBUTE_UNUSED, |
| 806 | arelent *reloc_entry, |
| 807 | asymbol *symbol ATTRIBUTE_UNUSED, |
| 808 | void *data ATTRIBUTE_UNUSED, |
| 809 | asection *input_section, |
| 810 | bfd *output_bfd, |
| 811 | char **error_message ATTRIBUTE_UNUSED) |
| 812 | { |
| 813 | if (output_bfd != NULL) |
| 814 | reloc_entry->address += input_section->output_offset; |
| 815 | return bfd_reloc_ok; |
| 816 | } |
| 817 | |
| 818 | bfd_reloc_status_type |
| 819 | m68hc11_elf_special_reloc (bfd *abfd ATTRIBUTE_UNUSED, |
| 820 | arelent *reloc_entry, |
| 821 | asymbol *symbol, |
| 822 | void *data ATTRIBUTE_UNUSED, |
| 823 | asection *input_section, |
| 824 | bfd *output_bfd, |
| 825 | char **error_message ATTRIBUTE_UNUSED) |
| 826 | { |
| 827 | if (output_bfd != (bfd *) NULL |
| 828 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 829 | && (! reloc_entry->howto->partial_inplace |
| 830 | || reloc_entry->addend == 0)) |
| 831 | { |
| 832 | reloc_entry->address += input_section->output_offset; |
| 833 | return bfd_reloc_ok; |
| 834 | } |
| 835 | |
| 836 | if (output_bfd != NULL) |
| 837 | return bfd_reloc_continue; |
| 838 | |
| 839 | if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) |
| 840 | return bfd_reloc_outofrange; |
| 841 | |
| 842 | abort(); |
| 843 | } |
| 844 | |
| 845 | /* Look through the relocs for a section during the first phase. |
| 846 | Since we don't do .gots or .plts, we just need to consider the |
| 847 | virtual table relocs for gc. */ |
| 848 | |
| 849 | bfd_boolean |
| 850 | elf32_m68hc11_check_relocs (bfd *abfd, struct bfd_link_info *info, |
| 851 | asection *sec, const Elf_Internal_Rela *relocs) |
| 852 | { |
| 853 | Elf_Internal_Shdr * symtab_hdr; |
| 854 | struct elf_link_hash_entry ** sym_hashes; |
| 855 | const Elf_Internal_Rela * rel; |
| 856 | const Elf_Internal_Rela * rel_end; |
| 857 | |
| 858 | if (info->relocatable) |
| 859 | return TRUE; |
| 860 | |
| 861 | symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| 862 | sym_hashes = elf_sym_hashes (abfd); |
| 863 | rel_end = relocs + sec->reloc_count; |
| 864 | |
| 865 | for (rel = relocs; rel < rel_end; rel++) |
| 866 | { |
| 867 | struct elf_link_hash_entry * h; |
| 868 | unsigned long r_symndx; |
| 869 | |
| 870 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 871 | |
| 872 | if (r_symndx < symtab_hdr->sh_info) |
| 873 | h = NULL; |
| 874 | else |
| 875 | { |
| 876 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; |
| 877 | while (h->root.type == bfd_link_hash_indirect |
| 878 | || h->root.type == bfd_link_hash_warning) |
| 879 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 880 | } |
| 881 | |
| 882 | switch (ELF32_R_TYPE (rel->r_info)) |
| 883 | { |
| 884 | /* This relocation describes the C++ object vtable hierarchy. |
| 885 | Reconstruct it for later use during GC. */ |
| 886 | case R_M68HC11_GNU_VTINHERIT: |
| 887 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 888 | return FALSE; |
| 889 | break; |
| 890 | |
| 891 | /* This relocation describes which C++ vtable entries are actually |
| 892 | used. Record for later use during GC. */ |
| 893 | case R_M68HC11_GNU_VTENTRY: |
| 894 | BFD_ASSERT (h != NULL); |
| 895 | if (h != NULL |
| 896 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 897 | return FALSE; |
| 898 | break; |
| 899 | } |
| 900 | } |
| 901 | |
| 902 | return TRUE; |
| 903 | } |
| 904 | |
| 905 | /* Relocate a 68hc11/68hc12 ELF section. */ |
| 906 | bfd_boolean |
| 907 | elf32_m68hc11_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 908 | struct bfd_link_info *info, |
| 909 | bfd *input_bfd, asection *input_section, |
| 910 | bfd_byte *contents, Elf_Internal_Rela *relocs, |
| 911 | Elf_Internal_Sym *local_syms, |
| 912 | asection **local_sections) |
| 913 | { |
| 914 | Elf_Internal_Shdr *symtab_hdr; |
| 915 | struct elf_link_hash_entry **sym_hashes; |
| 916 | Elf_Internal_Rela *rel, *relend; |
| 917 | const char *name = NULL; |
| 918 | struct m68hc11_page_info *pinfo; |
| 919 | const struct elf_backend_data * const ebd = get_elf_backend_data (input_bfd); |
| 920 | struct m68hc11_elf_link_hash_table *htab; |
| 921 | unsigned long e_flags; |
| 922 | |
| 923 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 924 | sym_hashes = elf_sym_hashes (input_bfd); |
| 925 | e_flags = elf_elfheader (input_bfd)->e_flags; |
| 926 | |
| 927 | htab = m68hc11_elf_hash_table (info); |
| 928 | if (htab == NULL) |
| 929 | return FALSE; |
| 930 | |
| 931 | /* Get memory bank parameters. */ |
| 932 | m68hc11_elf_get_bank_parameters (info); |
| 933 | |
| 934 | pinfo = & htab->pinfo; |
| 935 | rel = relocs; |
| 936 | relend = relocs + input_section->reloc_count; |
| 937 | |
| 938 | for (; rel < relend; rel++) |
| 939 | { |
| 940 | int r_type; |
| 941 | arelent arel; |
| 942 | reloc_howto_type *howto; |
| 943 | unsigned long r_symndx; |
| 944 | Elf_Internal_Sym *sym; |
| 945 | asection *sec; |
| 946 | bfd_vma relocation = 0; |
| 947 | bfd_reloc_status_type r = bfd_reloc_undefined; |
| 948 | bfd_vma phys_page; |
| 949 | bfd_vma phys_addr; |
| 950 | bfd_vma insn_addr; |
| 951 | bfd_vma insn_page; |
| 952 | bfd_boolean is_far = FALSE; |
| 953 | bfd_boolean is_xgate_symbol = FALSE; |
| 954 | bfd_boolean is_section_symbol = FALSE; |
| 955 | struct elf_link_hash_entry *h; |
| 956 | bfd_vma val; |
| 957 | |
| 958 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 959 | r_type = ELF32_R_TYPE (rel->r_info); |
| 960 | |
| 961 | if (r_type == R_M68HC11_GNU_VTENTRY |
| 962 | || r_type == R_M68HC11_GNU_VTINHERIT) |
| 963 | continue; |
| 964 | |
| 965 | (*ebd->elf_info_to_howto_rel) (input_bfd, &arel, rel); |
| 966 | howto = arel.howto; |
| 967 | |
| 968 | h = NULL; |
| 969 | sym = NULL; |
| 970 | sec = NULL; |
| 971 | if (r_symndx < symtab_hdr->sh_info) |
| 972 | { |
| 973 | sym = local_syms + r_symndx; |
| 974 | sec = local_sections[r_symndx]; |
| 975 | relocation = (sec->output_section->vma |
| 976 | + sec->output_offset |
| 977 | + sym->st_value); |
| 978 | is_far = (sym && (sym->st_other & STO_M68HC12_FAR)); |
| 979 | is_xgate_symbol = (sym && (sym->st_target_internal)); |
| 980 | is_section_symbol = ELF_ST_TYPE (sym->st_info) & STT_SECTION; |
| 981 | } |
| 982 | else |
| 983 | { |
| 984 | bfd_boolean unresolved_reloc, warned; |
| 985 | |
| 986 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 987 | r_symndx, symtab_hdr, sym_hashes, |
| 988 | h, sec, relocation, unresolved_reloc, |
| 989 | warned); |
| 990 | |
| 991 | is_far = (h && (h->other & STO_M68HC12_FAR)); |
| 992 | is_xgate_symbol = (h && (h->target_internal)); |
| 993 | } |
| 994 | |
| 995 | if (sec != NULL && discarded_section (sec)) |
| 996 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 997 | rel, 1, relend, howto, 0, contents); |
| 998 | |
| 999 | if (info->relocatable) |
| 1000 | { |
| 1001 | /* This is a relocatable link. We don't have to change |
| 1002 | anything, unless the reloc is against a section symbol, |
| 1003 | in which case we have to adjust according to where the |
| 1004 | section symbol winds up in the output section. */ |
| 1005 | if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 1006 | rel->r_addend += sec->output_offset; |
| 1007 | continue; |
| 1008 | } |
| 1009 | |
| 1010 | if (h != NULL) |
| 1011 | name = h->root.root.string; |
| 1012 | else |
| 1013 | { |
| 1014 | name = (bfd_elf_string_from_elf_section |
| 1015 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| 1016 | if (name == NULL || *name == '\0') |
| 1017 | name = bfd_section_name (input_bfd, sec); |
| 1018 | } |
| 1019 | |
| 1020 | if (is_far && ELF32_R_TYPE (rel->r_info) == R_M68HC11_16) |
| 1021 | { |
| 1022 | struct elf32_m68hc11_stub_hash_entry* stub; |
| 1023 | |
| 1024 | stub = m68hc12_stub_hash_lookup (htab->stub_hash_table, |
| 1025 | name, FALSE, FALSE); |
| 1026 | if (stub) |
| 1027 | { |
| 1028 | relocation = stub->stub_offset |
| 1029 | + stub->stub_sec->output_section->vma |
| 1030 | + stub->stub_sec->output_offset; |
| 1031 | is_far = FALSE; |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | /* Do the memory bank mapping. */ |
| 1036 | phys_addr = m68hc11_phys_addr (pinfo, relocation + rel->r_addend); |
| 1037 | phys_page = m68hc11_phys_page (pinfo, relocation + rel->r_addend); |
| 1038 | switch (r_type) |
| 1039 | { |
| 1040 | case R_M68HC12_LO8XG: |
| 1041 | /* This relocation is specific to XGATE IMM16 calls and will precede |
| 1042 | a HI8. tc-m68hc11 only generates them in pairs. |
| 1043 | Leave the relocation to the HI8XG step. */ |
| 1044 | r = bfd_reloc_ok; |
| 1045 | r_type = R_M68HC11_NONE; |
| 1046 | break; |
| 1047 | |
| 1048 | case R_M68HC12_HI8XG: |
| 1049 | /* This relocation is specific to XGATE IMM16 calls and must follow |
| 1050 | a LO8XG. Does not actually check that it was a LO8XG. |
| 1051 | Adjusts high and low bytes. */ |
| 1052 | relocation = phys_addr; |
| 1053 | if ((e_flags & E_M68HC11_XGATE_RAMOFFSET) |
| 1054 | && (relocation >= 0x2000)) |
| 1055 | relocation += 0xc000; /* HARDCODED RAM offset for XGATE. */ |
| 1056 | |
| 1057 | /* Fetch 16 bit value including low byte in previous insn. */ |
| 1058 | val = (bfd_get_8 (input_bfd, (bfd_byte*) contents + rel->r_offset) << 8) |
| 1059 | | bfd_get_8 (input_bfd, (bfd_byte*) contents + rel->r_offset - 2); |
| 1060 | |
| 1061 | /* Add on value to preserve carry, then write zero to high byte. */ |
| 1062 | relocation += val; |
| 1063 | |
| 1064 | /* Write out top byte. */ |
| 1065 | bfd_put_8 (input_bfd, (relocation >> 8) & 0xff, |
| 1066 | (bfd_byte*) contents + rel->r_offset); |
| 1067 | |
| 1068 | /* Write out low byte to previous instruction. */ |
| 1069 | bfd_put_8 (input_bfd, relocation & 0xff, |
| 1070 | (bfd_byte*) contents + rel->r_offset - 2); |
| 1071 | |
| 1072 | /* Mark as relocation completed. */ |
| 1073 | r = bfd_reloc_ok; |
| 1074 | r_type = R_M68HC11_NONE; |
| 1075 | break; |
| 1076 | |
| 1077 | /* The HI8 and LO8 relocs are generated by %hi(expr) %lo(expr) |
| 1078 | assembler directives. %hi does not support carry. */ |
| 1079 | case R_M68HC11_HI8: |
| 1080 | case R_M68HC11_LO8: |
| 1081 | relocation = phys_addr; |
| 1082 | break; |
| 1083 | |
| 1084 | case R_M68HC11_24: |
| 1085 | /* Reloc used by 68HC12 call instruction. */ |
| 1086 | bfd_put_16 (input_bfd, phys_addr, |
| 1087 | (bfd_byte*) contents + rel->r_offset); |
| 1088 | bfd_put_8 (input_bfd, phys_page, |
| 1089 | (bfd_byte*) contents + rel->r_offset + 2); |
| 1090 | r = bfd_reloc_ok; |
| 1091 | r_type = R_M68HC11_NONE; |
| 1092 | break; |
| 1093 | |
| 1094 | case R_M68HC11_NONE: |
| 1095 | r = bfd_reloc_ok; |
| 1096 | break; |
| 1097 | |
| 1098 | case R_M68HC11_LO16: |
| 1099 | /* Reloc generated by %addr(expr) gas to obtain the |
| 1100 | address as mapped in the memory bank window. */ |
| 1101 | relocation = phys_addr; |
| 1102 | break; |
| 1103 | |
| 1104 | case R_M68HC11_PAGE: |
| 1105 | /* Reloc generated by %page(expr) gas to obtain the |
| 1106 | page number associated with the address. */ |
| 1107 | relocation = phys_page; |
| 1108 | break; |
| 1109 | |
| 1110 | case R_M68HC11_16: |
| 1111 | /* Get virtual address of instruction having the relocation. */ |
| 1112 | if (is_far) |
| 1113 | { |
| 1114 | const char* msg; |
| 1115 | char* buf; |
| 1116 | msg = _("Reference to the far symbol `%s' using a wrong " |
| 1117 | "relocation may result in incorrect execution"); |
| 1118 | buf = alloca (strlen (msg) + strlen (name) + 10); |
| 1119 | sprintf (buf, msg, name); |
| 1120 | |
| 1121 | (* info->callbacks->warning) |
| 1122 | (info, buf, name, input_bfd, NULL, rel->r_offset); |
| 1123 | } |
| 1124 | |
| 1125 | /* Get virtual address of instruction having the relocation. */ |
| 1126 | insn_addr = input_section->output_section->vma |
| 1127 | + input_section->output_offset |
| 1128 | + rel->r_offset; |
| 1129 | |
| 1130 | insn_page = m68hc11_phys_page (pinfo, insn_addr); |
| 1131 | |
| 1132 | /* If we are linking an S12 instruction against an XGATE symbol, we |
| 1133 | need to change the offset of the symbol value so that it's correct |
| 1134 | from the S12's perspective. */ |
| 1135 | if (is_xgate_symbol) |
| 1136 | { |
| 1137 | /* The ram in the global space is mapped to 0x2000 in the 16-bit |
| 1138 | address space for S12 and 0xE000 in the 16-bit address space |
| 1139 | for XGATE. */ |
| 1140 | if (relocation >= 0xE000) |
| 1141 | { |
| 1142 | /* We offset the address by the difference |
| 1143 | between these two mappings. */ |
| 1144 | relocation -= 0xC000; |
| 1145 | break; |
| 1146 | } |
| 1147 | else |
| 1148 | { |
| 1149 | const char * msg; |
| 1150 | char * buf; |
| 1151 | |
| 1152 | msg = _("XGATE address (%lx) is not within shared RAM" |
| 1153 | "(0xE000-0xFFFF), therefore you must manually offset " |
| 1154 | "the address, and possibly manage the page, in your " |
| 1155 | "code."); |
| 1156 | buf = alloca (strlen (msg) + 128); |
| 1157 | sprintf (buf, msg, phys_addr); |
| 1158 | if (!((*info->callbacks->warning) (info, buf, name, input_bfd, |
| 1159 | input_section, insn_addr))) |
| 1160 | return FALSE; |
| 1161 | break; |
| 1162 | } |
| 1163 | } |
| 1164 | |
| 1165 | if (m68hc11_addr_is_banked (pinfo, relocation + rel->r_addend) |
| 1166 | && m68hc11_addr_is_banked (pinfo, insn_addr) |
| 1167 | && phys_page != insn_page && !(e_flags & E_M68HC11_NO_BANK_WARNING)) |
| 1168 | { |
| 1169 | const char * msg; |
| 1170 | char * buf; |
| 1171 | |
| 1172 | msg = _("banked address [%lx:%04lx] (%lx) is not in the same bank " |
| 1173 | "as current banked address [%lx:%04lx] (%lx)"); |
| 1174 | |
| 1175 | buf = alloca (strlen (msg) + 128); |
| 1176 | sprintf (buf, msg, phys_page, phys_addr, |
| 1177 | (long) (relocation + rel->r_addend), |
| 1178 | insn_page, m68hc11_phys_addr (pinfo, insn_addr), |
| 1179 | (long) (insn_addr)); |
| 1180 | if (!((*info->callbacks->warning) |
| 1181 | (info, buf, name, input_bfd, input_section, |
| 1182 | rel->r_offset))) |
| 1183 | return FALSE; |
| 1184 | break; |
| 1185 | } |
| 1186 | |
| 1187 | if (phys_page != 0 && insn_page == 0) |
| 1188 | { |
| 1189 | const char * msg; |
| 1190 | char * buf; |
| 1191 | |
| 1192 | msg = _("reference to a banked address [%lx:%04lx] in the " |
| 1193 | "normal address space at %04lx"); |
| 1194 | |
| 1195 | buf = alloca (strlen (msg) + 128); |
| 1196 | sprintf (buf, msg, phys_page, phys_addr, insn_addr); |
| 1197 | if (!((*info->callbacks->warning) |
| 1198 | (info, buf, name, input_bfd, input_section, |
| 1199 | insn_addr))) |
| 1200 | return FALSE; |
| 1201 | |
| 1202 | relocation = phys_addr; |
| 1203 | break; |
| 1204 | } |
| 1205 | |
| 1206 | /* If this is a banked address use the phys_addr so that |
| 1207 | we stay in the banked window. */ |
| 1208 | if (m68hc11_addr_is_banked (pinfo, relocation + rel->r_addend)) |
| 1209 | relocation = phys_addr; |
| 1210 | break; |
| 1211 | } |
| 1212 | |
| 1213 | /* If we are linking an XGATE instruction against an S12 symbol, we |
| 1214 | need to change the offset of the symbol value so that it's correct |
| 1215 | from the XGATE's perspective. */ |
| 1216 | if (!strcmp (howto->name, "R_XGATE_IMM8_LO") |
| 1217 | || !strcmp (howto->name, "R_XGATE_IMM8_HI")) |
| 1218 | { |
| 1219 | /* We can only offset S12 addresses that lie within the non-paged |
| 1220 | area of RAM. */ |
| 1221 | if (!is_xgate_symbol && !is_section_symbol) |
| 1222 | { |
| 1223 | /* The ram in the global space is mapped to 0x2000 and stops at |
| 1224 | 0x4000 in the 16-bit address space for S12 and 0xE000 in the |
| 1225 | 16-bit address space for XGATE. */ |
| 1226 | if (relocation >= 0x2000 && relocation < 0x4000) |
| 1227 | /* We offset the address by the difference |
| 1228 | between these two mappings. */ |
| 1229 | relocation += 0xC000; |
| 1230 | else |
| 1231 | { |
| 1232 | const char * msg; |
| 1233 | char * buf; |
| 1234 | |
| 1235 | /* Get virtual address of instruction having the relocation. */ |
| 1236 | insn_addr = input_section->output_section->vma |
| 1237 | + input_section->output_offset + rel->r_offset; |
| 1238 | |
| 1239 | msg = _("S12 address (%lx) is not within shared RAM" |
| 1240 | "(0x2000-0x4000), therefore you must manually " |
| 1241 | "offset the address in your code"); |
| 1242 | buf = alloca (strlen (msg) + 128); |
| 1243 | sprintf (buf, msg, phys_addr); |
| 1244 | if (!((*info->callbacks->warning) (info, buf, name, input_bfd, |
| 1245 | input_section, insn_addr))) |
| 1246 | return FALSE; |
| 1247 | break; |
| 1248 | } |
| 1249 | } |
| 1250 | } |
| 1251 | |
| 1252 | if (r_type != R_M68HC11_NONE) |
| 1253 | { |
| 1254 | if ((r_type == R_M68HC12_PCREL_9) || (r_type == R_M68HC12_PCREL_10)) |
| 1255 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1256 | contents, rel->r_offset, |
| 1257 | relocation - 2, rel->r_addend); |
| 1258 | else |
| 1259 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1260 | contents, rel->r_offset, |
| 1261 | relocation, rel->r_addend); |
| 1262 | } |
| 1263 | |
| 1264 | if (r != bfd_reloc_ok) |
| 1265 | { |
| 1266 | const char * msg = (const char *) 0; |
| 1267 | |
| 1268 | switch (r) |
| 1269 | { |
| 1270 | case bfd_reloc_overflow: |
| 1271 | if (!((*info->callbacks->reloc_overflow) |
| 1272 | (info, NULL, name, howto->name, (bfd_vma) 0, |
| 1273 | input_bfd, input_section, rel->r_offset))) |
| 1274 | return FALSE; |
| 1275 | break; |
| 1276 | |
| 1277 | case bfd_reloc_undefined: |
| 1278 | if (!((*info->callbacks->undefined_symbol) |
| 1279 | (info, name, input_bfd, input_section, |
| 1280 | rel->r_offset, TRUE))) |
| 1281 | return FALSE; |
| 1282 | break; |
| 1283 | |
| 1284 | case bfd_reloc_outofrange: |
| 1285 | msg = _ ("internal error: out of range error"); |
| 1286 | goto common_error; |
| 1287 | |
| 1288 | case bfd_reloc_notsupported: |
| 1289 | msg = _ ("internal error: unsupported relocation error"); |
| 1290 | goto common_error; |
| 1291 | |
| 1292 | case bfd_reloc_dangerous: |
| 1293 | msg = _ ("internal error: dangerous error"); |
| 1294 | goto common_error; |
| 1295 | |
| 1296 | default: |
| 1297 | msg = _ ("internal error: unknown error"); |
| 1298 | /* fall through */ |
| 1299 | |
| 1300 | common_error: |
| 1301 | if (!((*info->callbacks->warning) |
| 1302 | (info, msg, name, input_bfd, input_section, |
| 1303 | rel->r_offset))) |
| 1304 | return FALSE; |
| 1305 | break; |
| 1306 | } |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | return TRUE; |
| 1311 | } |
| 1312 | |
| 1313 | |
| 1314 | \f |
| 1315 | /* Set and control ELF flags in ELF header. */ |
| 1316 | |
| 1317 | bfd_boolean |
| 1318 | _bfd_m68hc11_elf_set_private_flags (bfd *abfd, flagword flags) |
| 1319 | { |
| 1320 | BFD_ASSERT (!elf_flags_init (abfd) |
| 1321 | || elf_elfheader (abfd)->e_flags == flags); |
| 1322 | |
| 1323 | elf_elfheader (abfd)->e_flags = flags; |
| 1324 | elf_flags_init (abfd) = TRUE; |
| 1325 | return TRUE; |
| 1326 | } |
| 1327 | |
| 1328 | /* Merge backend specific data from an object file to the output |
| 1329 | object file when linking. */ |
| 1330 | |
| 1331 | bfd_boolean |
| 1332 | _bfd_m68hc11_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) |
| 1333 | { |
| 1334 | flagword old_flags; |
| 1335 | flagword new_flags; |
| 1336 | bfd_boolean ok = TRUE; |
| 1337 | |
| 1338 | /* Check if we have the same endianness */ |
| 1339 | if (!_bfd_generic_verify_endian_match (ibfd, obfd)) |
| 1340 | return FALSE; |
| 1341 | |
| 1342 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 1343 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 1344 | return TRUE; |
| 1345 | |
| 1346 | new_flags = elf_elfheader (ibfd)->e_flags; |
| 1347 | elf_elfheader (obfd)->e_flags |= new_flags & EF_M68HC11_ABI; |
| 1348 | old_flags = elf_elfheader (obfd)->e_flags; |
| 1349 | |
| 1350 | if (! elf_flags_init (obfd)) |
| 1351 | { |
| 1352 | elf_flags_init (obfd) = TRUE; |
| 1353 | elf_elfheader (obfd)->e_flags = new_flags; |
| 1354 | elf_elfheader (obfd)->e_ident[EI_CLASS] |
| 1355 | = elf_elfheader (ibfd)->e_ident[EI_CLASS]; |
| 1356 | |
| 1357 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) |
| 1358 | && bfd_get_arch_info (obfd)->the_default) |
| 1359 | { |
| 1360 | if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), |
| 1361 | bfd_get_mach (ibfd))) |
| 1362 | return FALSE; |
| 1363 | } |
| 1364 | |
| 1365 | return TRUE; |
| 1366 | } |
| 1367 | |
| 1368 | /* Check ABI compatibility. */ |
| 1369 | if ((new_flags & E_M68HC11_I32) != (old_flags & E_M68HC11_I32)) |
| 1370 | { |
| 1371 | (*_bfd_error_handler) |
| 1372 | (_("%B: linking files compiled for 16-bit integers (-mshort) " |
| 1373 | "and others for 32-bit integers"), ibfd); |
| 1374 | ok = FALSE; |
| 1375 | } |
| 1376 | if ((new_flags & E_M68HC11_F64) != (old_flags & E_M68HC11_F64)) |
| 1377 | { |
| 1378 | (*_bfd_error_handler) |
| 1379 | (_("%B: linking files compiled for 32-bit double (-fshort-double) " |
| 1380 | "and others for 64-bit double"), ibfd); |
| 1381 | ok = FALSE; |
| 1382 | } |
| 1383 | |
| 1384 | /* Processor compatibility. */ |
| 1385 | if (!EF_M68HC11_CAN_MERGE_MACH (new_flags, old_flags)) |
| 1386 | { |
| 1387 | (*_bfd_error_handler) |
| 1388 | (_("%B: linking files compiled for HCS12 with " |
| 1389 | "others compiled for HC12"), ibfd); |
| 1390 | ok = FALSE; |
| 1391 | } |
| 1392 | new_flags = ((new_flags & ~EF_M68HC11_MACH_MASK) |
| 1393 | | (EF_M68HC11_MERGE_MACH (new_flags, old_flags))); |
| 1394 | |
| 1395 | elf_elfheader (obfd)->e_flags = new_flags; |
| 1396 | |
| 1397 | new_flags &= ~(EF_M68HC11_ABI | EF_M68HC11_MACH_MASK); |
| 1398 | old_flags &= ~(EF_M68HC11_ABI | EF_M68HC11_MACH_MASK); |
| 1399 | |
| 1400 | /* Warn about any other mismatches */ |
| 1401 | if (new_flags != old_flags) |
| 1402 | { |
| 1403 | (*_bfd_error_handler) |
| 1404 | (_("%B: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"), |
| 1405 | ibfd, (unsigned long) new_flags, (unsigned long) old_flags); |
| 1406 | ok = FALSE; |
| 1407 | } |
| 1408 | |
| 1409 | if (! ok) |
| 1410 | { |
| 1411 | bfd_set_error (bfd_error_bad_value); |
| 1412 | return FALSE; |
| 1413 | } |
| 1414 | |
| 1415 | return TRUE; |
| 1416 | } |
| 1417 | |
| 1418 | bfd_boolean |
| 1419 | _bfd_m68hc11_elf_print_private_bfd_data (bfd *abfd, void *ptr) |
| 1420 | { |
| 1421 | FILE *file = (FILE *) ptr; |
| 1422 | |
| 1423 | BFD_ASSERT (abfd != NULL && ptr != NULL); |
| 1424 | |
| 1425 | /* Print normal ELF private data. */ |
| 1426 | _bfd_elf_print_private_bfd_data (abfd, ptr); |
| 1427 | |
| 1428 | /* xgettext:c-format */ |
| 1429 | fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); |
| 1430 | |
| 1431 | if (elf_elfheader (abfd)->e_flags & E_M68HC11_I32) |
| 1432 | fprintf (file, _("[abi=32-bit int, ")); |
| 1433 | else |
| 1434 | fprintf (file, _("[abi=16-bit int, ")); |
| 1435 | |
| 1436 | if (elf_elfheader (abfd)->e_flags & E_M68HC11_F64) |
| 1437 | fprintf (file, _("64-bit double, ")); |
| 1438 | else |
| 1439 | fprintf (file, _("32-bit double, ")); |
| 1440 | |
| 1441 | if (strcmp (bfd_get_target (abfd), "elf32-m68hc11") == 0) |
| 1442 | fprintf (file, _("cpu=HC11]")); |
| 1443 | else if (elf_elfheader (abfd)->e_flags & EF_M68HCS12_MACH) |
| 1444 | fprintf (file, _("cpu=HCS12]")); |
| 1445 | else |
| 1446 | fprintf (file, _("cpu=HC12]")); |
| 1447 | |
| 1448 | if (elf_elfheader (abfd)->e_flags & E_M68HC12_BANKS) |
| 1449 | fprintf (file, _(" [memory=bank-model]")); |
| 1450 | else |
| 1451 | fprintf (file, _(" [memory=flat]")); |
| 1452 | |
| 1453 | if (elf_elfheader (abfd)->e_flags & E_M68HC11_XGATE_RAMOFFSET) |
| 1454 | fprintf (file, _(" [XGATE RAM offsetting]")); |
| 1455 | |
| 1456 | fputc ('\n', file); |
| 1457 | |
| 1458 | return TRUE; |
| 1459 | } |
| 1460 | |
| 1461 | static void scan_sections_for_abi (bfd *abfd ATTRIBUTE_UNUSED, |
| 1462 | asection *asect, void *arg) |
| 1463 | { |
| 1464 | struct m68hc11_scan_param* p = (struct m68hc11_scan_param*) arg; |
| 1465 | |
| 1466 | if (asect->vma >= p->pinfo->bank_virtual) |
| 1467 | p->use_memory_banks = TRUE; |
| 1468 | } |
| 1469 | |
| 1470 | /* Tweak the OSABI field of the elf header. */ |
| 1471 | |
| 1472 | void |
| 1473 | elf32_m68hc11_post_process_headers (bfd *abfd, struct bfd_link_info *link_info) |
| 1474 | { |
| 1475 | struct m68hc11_scan_param param; |
| 1476 | struct m68hc11_elf_link_hash_table *htab; |
| 1477 | |
| 1478 | if (link_info == NULL) |
| 1479 | return; |
| 1480 | |
| 1481 | htab = m68hc11_elf_hash_table (link_info); |
| 1482 | if (htab == NULL) |
| 1483 | return; |
| 1484 | |
| 1485 | m68hc11_elf_get_bank_parameters (link_info); |
| 1486 | |
| 1487 | param.use_memory_banks = FALSE; |
| 1488 | param.pinfo = & htab->pinfo; |
| 1489 | |
| 1490 | bfd_map_over_sections (abfd, scan_sections_for_abi, ¶m); |
| 1491 | |
| 1492 | if (param.use_memory_banks) |
| 1493 | { |
| 1494 | Elf_Internal_Ehdr * i_ehdrp; |
| 1495 | |
| 1496 | i_ehdrp = elf_elfheader (abfd); |
| 1497 | i_ehdrp->e_flags |= E_M68HC12_BANKS; |
| 1498 | } |
| 1499 | } |