1 /* Morpho Technologies MT specific support for 32-bit ELF 2 Copyright (C) 2001-2017 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, 19 MA 02111-1307, USA. */ 20 21 #include "sysdep.h" 22 #include "bfd.h" 23 #include "libbfd.h" 24 #include "elf-bfd.h" 25 #include "elf/mt.h" 26 27 /* Prototypes. */ 28 static reloc_howto_type * mt_reloc_type_lookup 29 (bfd *, bfd_reloc_code_real_type); 30 31 static void mt_info_to_howto_rela 32 (bfd *, arelent *, Elf_Internal_Rela *); 33 34 static bfd_reloc_status_type mt_elf_relocate_hi16 35 (bfd *, Elf_Internal_Rela *, bfd_byte *, bfd_vma); 36 37 static bfd_reloc_status_type mt_final_link_relocate 38 (reloc_howto_type *, bfd *, asection *, bfd_byte *, 39 Elf_Internal_Rela *, bfd_vma); 40 41 static bfd_boolean mt_elf_relocate_section 42 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 43 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **); 44 45 /* Relocation tables. */ 46 static reloc_howto_type mt_elf_howto_table [] = 47 { 48 /* This reloc does nothing. */ 49 HOWTO (R_MT_NONE, /* type */ 50 0, /* rightshift */ 51 3, /* size (0 = byte, 1 = short, 2 = long) */ 52 0, /* bitsize */ 53 FALSE, /* pc_relative */ 54 0, /* bitpos */ 55 complain_overflow_dont, /* complain_on_overflow */ 56 bfd_elf_generic_reloc, /* special_function */ 57 "R_MT_NONE", /* name */ 58 FALSE, /* partial_inplace */ 59 0 , /* src_mask */ 60 0, /* dst_mask */ 61 FALSE), /* pcrel_offset */ 62 63 /* A 16 bit absolute relocation. */ 64 HOWTO (R_MT_16, /* type */ 65 0, /* rightshift */ 66 2, /* size (0 = byte, 1 = short, 2 = long) */ 67 16, /* bitsize */ 68 FALSE, /* pc_relative */ 69 0, /* bitpos */ 70 complain_overflow_dont, /* complain_on_overflow */ 71 bfd_elf_generic_reloc, /* special_function */ 72 "R_MT_16", /* name */ 73 FALSE, /* partial_inplace */ 74 0 , /* src_mask */ 75 0xffff, /* dst_mask */ 76 FALSE), /* pcrel_offset */ 77 78 /* A 32 bit absolute relocation. */ 79 HOWTO (R_MT_32, /* type */ 80 0, /* rightshift */ 81 2, /* size (0 = byte, 1 = short, 2 = long) */ 82 32, /* bitsize */ 83 FALSE, /* pc_relative */ 84 0, /* bitpos */ 85 complain_overflow_dont, /* complain_on_overflow */ 86 bfd_elf_generic_reloc, /* special_function */ 87 "R_MT_32", /* name */ 88 FALSE, /* partial_inplace */ 89 0 , /* src_mask */ 90 0xffffffff, /* dst_mask */ 91 FALSE), /* pcrel_offset */ 92 93 /* A 32 bit pc-relative relocation. */ 94 HOWTO (R_MT_32_PCREL, /* type */ 95 0, /* rightshift */ 96 2, /* size (0 = byte, 1 = short, 2 = long) */ 97 32, /* bitsize */ 98 TRUE, /* pc_relative */ 99 0, /* bitpos */ 100 complain_overflow_dont, /* complain_on_overflow */ 101 bfd_elf_generic_reloc, /* special_function */ 102 "R_MT_32_PCREL", /* name */ 103 FALSE, /* partial_inplace */ 104 0 , /* src_mask */ 105 0xffffffff, /* dst_mask */ 106 TRUE), /* pcrel_offset */ 107 108 /* A 16 bit pc-relative relocation. */ 109 HOWTO (R_MT_PC16, /* type */ 110 0, /* rightshift */ 111 2, /* size (0 = byte, 1 = short, 2 = long) */ 112 16, /* bitsize */ 113 TRUE, /* pc_relative */ 114 0, /* bitpos */ 115 complain_overflow_signed, /* complain_on_overflow */ 116 bfd_elf_generic_reloc, /* special_function */ 117 "R_MT_PC16", /* name */ 118 FALSE, /* partial_inplace */ 119 0, /* src_mask */ 120 0xffff, /* dst_mask */ 121 TRUE), /* pcrel_offset */ 122 123 /* high 16 bits of symbol value. */ 124 HOWTO (R_MT_HI16, /* type */ 125 0, /* rightshift */ 126 2, /* size (0 = byte, 1 = short, 2 = long) */ 127 16, /* bitsize */ 128 FALSE, /* pc_relative */ 129 0, /* bitpos */ 130 complain_overflow_dont, /* complain_on_overflow */ 131 bfd_elf_generic_reloc, /* special_function */ 132 "R_MT_HI16", /* name */ 133 FALSE, /* partial_inplace */ 134 0xffff0000, /* src_mask */ 135 0xffff0000, /* dst_mask */ 136 FALSE), /* pcrel_offset */ 137 138 /* Low 16 bits of symbol value. */ 139 HOWTO (R_MT_LO16, /* type */ 140 0, /* rightshift */ 141 2, /* size (0 = byte, 1 = short, 2 = long) */ 142 16, /* bitsize */ 143 FALSE, /* pc_relative */ 144 0, /* bitpos */ 145 complain_overflow_dont, /* complain_on_overflow */ 146 bfd_elf_generic_reloc, /* special_function */ 147 "R_MT_LO16", /* name */ 148 FALSE, /* partial_inplace */ 149 0xffff, /* src_mask */ 150 0xffff, /* dst_mask */ 151 FALSE), /* pcrel_offset */ 152 }; 153 154 /* Map BFD reloc types to MT ELF reloc types. */ 155 156 static reloc_howto_type * 157 mt_reloc_type_lookup 158 (bfd * abfd ATTRIBUTE_UNUSED, 159 bfd_reloc_code_real_type code) 160 { 161 /* Note that the mt_elf_howto_table is indxed by the R_ 162 constants. Thus, the order that the howto records appear in the 163 table *must* match the order of the relocation types defined in 164 include/elf/mt.h. */ 165 166 switch (code) 167 { 168 case BFD_RELOC_NONE: 169 return &mt_elf_howto_table[ (int) R_MT_NONE]; 170 case BFD_RELOC_16: 171 return &mt_elf_howto_table[ (int) R_MT_16]; 172 case BFD_RELOC_32: 173 return &mt_elf_howto_table[ (int) R_MT_32]; 174 case BFD_RELOC_32_PCREL: 175 return &mt_elf_howto_table[ (int) R_MT_32_PCREL]; 176 case BFD_RELOC_16_PCREL: 177 return &mt_elf_howto_table[ (int) R_MT_PC16]; 178 case BFD_RELOC_HI16: 179 return &mt_elf_howto_table[ (int) R_MT_HI16]; 180 case BFD_RELOC_LO16: 181 return &mt_elf_howto_table[ (int) R_MT_LO16]; 182 183 default: 184 /* Pacify gcc -Wall. */ 185 return NULL; 186 } 187 return NULL; 188 } 189 190 static reloc_howto_type * 191 mt_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 192 const char *r_name) 193 { 194 unsigned int i; 195 196 for (i = 0; 197 i < sizeof (mt_elf_howto_table) / sizeof (mt_elf_howto_table[0]); 198 i++) 199 if (mt_elf_howto_table[i].name != NULL 200 && strcasecmp (mt_elf_howto_table[i].name, r_name) == 0) 201 return &mt_elf_howto_table[i]; 202 203 return NULL; 204 } 205 206 bfd_reloc_status_type 207 mt_elf_relocate_hi16 208 (bfd * input_bfd, 209 Elf_Internal_Rela * relhi, 210 bfd_byte * contents, 211 bfd_vma value) 212 { 213 bfd_vma insn; 214 215 insn = bfd_get_32 (input_bfd, contents + relhi->r_offset); 216 217 value += relhi->r_addend; 218 value >>= 16; 219 insn = ((insn & ~0xFFFF) | value); 220 221 bfd_put_32 (input_bfd, insn, contents + relhi->r_offset); 222 return bfd_reloc_ok; 223 } 224 225 /* XXX: The following code is the result of a cut&paste. This unfortunate 226 practice is very widespread in the various target back-end files. */ 227 228 /* Set the howto pointer for a MT ELF reloc. */ 229 230 static void 231 mt_info_to_howto_rela 232 (bfd * abfd ATTRIBUTE_UNUSED, 233 arelent * cache_ptr, 234 Elf_Internal_Rela * dst) 235 { 236 unsigned int r_type; 237 238 r_type = ELF32_R_TYPE (dst->r_info); 239 if (r_type >= (unsigned int) R_MT_max) 240 { 241 /* xgettext:c-format */ 242 _bfd_error_handler (_("%B: invalid MT reloc number: %d"), abfd, r_type); 243 r_type = 0; 244 } 245 cache_ptr->howto = & mt_elf_howto_table [r_type]; 246 } 247 248 /* Perform a single relocation. By default we use the standard BFD 249 routines. */ 250 251 static bfd_reloc_status_type 252 mt_final_link_relocate 253 (reloc_howto_type * howto, 254 bfd * input_bfd, 255 asection * input_section, 256 bfd_byte * contents, 257 Elf_Internal_Rela * rel, 258 bfd_vma relocation) 259 { 260 return _bfd_final_link_relocate (howto, input_bfd, input_section, 261 contents, rel->r_offset, 262 relocation, rel->r_addend); 263 } 264 265 /* Relocate a MT ELF section. 266 There is some attempt to make this function usable for many architectures, 267 both USE_REL and USE_RELA ['twould be nice if such a critter existed], 268 if only to serve as a learning tool. 269 270 The RELOCATE_SECTION function is called by the new ELF backend linker 271 to handle the relocations for a section. 272 273 The relocs are always passed as Rela structures; if the section 274 actually uses Rel structures, the r_addend field will always be 275 zero. 276 277 This function is responsible for adjusting the section contents as 278 necessary, and (if using Rela relocs and generating a relocatable 279 output file) adjusting the reloc addend as necessary. 280 281 This function does not have to worry about setting the reloc 282 address or the reloc symbol index. 283 284 LOCAL_SYMS is a pointer to the swapped in local symbols. 285 286 LOCAL_SECTIONS is an array giving the section in the input file 287 corresponding to the st_shndx field of each local symbol. 288 289 The global hash table entry for the global symbols can be found 290 via elf_sym_hashes (input_bfd). 291 292 When generating relocatable output, this function must handle 293 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 294 going to be the section symbol corresponding to the output 295 section, which means that the addend must be adjusted 296 accordingly. */ 297 298 static bfd_boolean 299 mt_elf_relocate_section 300 (bfd * output_bfd ATTRIBUTE_UNUSED, 301 struct bfd_link_info * info, 302 bfd * input_bfd, 303 asection * input_section, 304 bfd_byte * contents, 305 Elf_Internal_Rela * relocs, 306 Elf_Internal_Sym * local_syms, 307 asection ** local_sections) 308 { 309 Elf_Internal_Shdr * symtab_hdr; 310 struct elf_link_hash_entry ** sym_hashes; 311 Elf_Internal_Rela * rel; 312 Elf_Internal_Rela * relend; 313 314 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 315 sym_hashes = elf_sym_hashes (input_bfd); 316 relend = relocs + input_section->reloc_count; 317 318 for (rel = relocs; rel < relend; rel ++) 319 { 320 reloc_howto_type * howto; 321 unsigned long r_symndx; 322 Elf_Internal_Sym * sym; 323 asection * sec; 324 struct elf_link_hash_entry * h; 325 bfd_vma relocation; 326 bfd_reloc_status_type r; 327 const char * name = NULL; 328 int r_type; 329 330 r_type = ELF32_R_TYPE (rel->r_info); 331 332 r_symndx = ELF32_R_SYM (rel->r_info); 333 334 howto = mt_elf_howto_table + ELF32_R_TYPE (rel->r_info); 335 h = NULL; 336 sym = NULL; 337 sec = NULL; 338 339 if (r_symndx < symtab_hdr->sh_info) 340 { 341 sym = local_syms + r_symndx; 342 sec = local_sections [r_symndx]; 343 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 344 345 name = bfd_elf_string_from_elf_section 346 (input_bfd, symtab_hdr->sh_link, sym->st_name); 347 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; 348 } 349 else 350 { 351 bfd_boolean unresolved_reloc; 352 bfd_boolean warned, ignored; 353 354 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 355 r_symndx, symtab_hdr, sym_hashes, 356 h, sec, relocation, 357 unresolved_reloc, warned, ignored); 358 359 name = h->root.root.string; 360 } 361 362 if (sec != NULL && discarded_section (sec)) 363 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 364 rel, 1, relend, howto, 0, contents); 365 366 if (bfd_link_relocatable (info)) 367 continue; 368 369 /* Finally, the sole MT-specific part. */ 370 switch (r_type) 371 { 372 case R_MT_HI16: 373 r = mt_elf_relocate_hi16 (input_bfd, rel, contents, relocation); 374 break; 375 default: 376 r = mt_final_link_relocate (howto, input_bfd, input_section, 377 contents, rel, relocation); 378 break; 379 } 380 381 382 if (r != bfd_reloc_ok) 383 { 384 const char * msg = (const char *) NULL; 385 386 switch (r) 387 { 388 case bfd_reloc_overflow: 389 (*info->callbacks->reloc_overflow) 390 (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0, 391 input_bfd, input_section, rel->r_offset); 392 break; 393 394 case bfd_reloc_undefined: 395 (*info->callbacks->undefined_symbol) 396 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 397 break; 398 399 case bfd_reloc_outofrange: 400 msg = _("internal error: out of range error"); 401 break; 402 403 case bfd_reloc_dangerous: 404 msg = _("internal error: dangerous relocation"); 405 break; 406 407 default: 408 msg = _("internal error: unknown error"); 409 break; 410 } 411 412 if (msg) 413 (*info->callbacks->warning) (info, msg, name, input_bfd, 414 input_section, rel->r_offset); 415 } 416 } 417 418 return TRUE; 419 } 420 421 /* Look through the relocs for a section during the first phase. 422 Since we don't do .gots or .plts, we just need to consider the 423 virtual table relocs for gc. */ 424 425 static bfd_boolean 426 mt_elf_check_relocs 427 (bfd * abfd, 428 struct bfd_link_info * info, 429 asection * sec, 430 const Elf_Internal_Rela * relocs) 431 { 432 Elf_Internal_Shdr * symtab_hdr; 433 struct elf_link_hash_entry ** sym_hashes; 434 const Elf_Internal_Rela * rel; 435 const Elf_Internal_Rela * rel_end; 436 437 if (bfd_link_relocatable (info)) 438 return TRUE; 439 440 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 441 sym_hashes = elf_sym_hashes (abfd); 442 443 rel_end = relocs + sec->reloc_count; 444 for (rel = relocs; rel < rel_end; rel++) 445 { 446 struct elf_link_hash_entry *h; 447 unsigned long r_symndx; 448 449 r_symndx = ELF32_R_SYM (rel->r_info); 450 if (r_symndx < symtab_hdr->sh_info) 451 h = NULL; 452 else 453 { 454 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 455 while (h->root.type == bfd_link_hash_indirect 456 || h->root.type == bfd_link_hash_warning) 457 h = (struct elf_link_hash_entry *) h->root.u.i.link; 458 459 /* PR15323, ref flags aren't set for references in the same 460 object. */ 461 h->root.non_ir_ref = 1; 462 } 463 } 464 465 return TRUE; 466 } 467 468 /* Return the MACH for an e_flags value. */ 469 470 static int 471 elf32_mt_machine (bfd *abfd) 472 { 473 switch (elf_elfheader (abfd)->e_flags & EF_MT_CPU_MASK) 474 { 475 case EF_MT_CPU_MRISC: return bfd_mach_ms1; 476 case EF_MT_CPU_MRISC2: return bfd_mach_mrisc2; 477 case EF_MT_CPU_MS2: return bfd_mach_ms2; 478 } 479 480 return bfd_mach_ms1; 481 } 482 483 static bfd_boolean 484 mt_elf_object_p (bfd * abfd) 485 { 486 bfd_default_set_arch_mach (abfd, bfd_arch_mt, elf32_mt_machine (abfd)); 487 488 return TRUE; 489 } 490 491 /* Function to set the ELF flag bits. */ 492 493 static bfd_boolean 494 mt_elf_set_private_flags (bfd * abfd, 495 flagword flags) 496 { 497 elf_elfheader (abfd)->e_flags = flags; 498 elf_flags_init (abfd) = TRUE; 499 return TRUE; 500 } 501 502 /* Merge backend specific data from an object file to the output 503 object file when linking. */ 504 505 static bfd_boolean 506 mt_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 507 { 508 bfd *obfd = info->output_bfd; 509 flagword old_flags, new_flags; 510 bfd_boolean ok = TRUE; 511 512 /* Check if we have the same endianness. */ 513 if (!_bfd_generic_verify_endian_match (ibfd, info)) 514 return FALSE; 515 516 /* If they're not both mt, then merging is meaningless, so just 517 don't do it. */ 518 if (strcmp (ibfd->arch_info->arch_name, "mt") != 0) 519 return TRUE; 520 if (strcmp (obfd->arch_info->arch_name, "mt") != 0) 521 return TRUE; 522 523 new_flags = elf_elfheader (ibfd)->e_flags; 524 old_flags = elf_elfheader (obfd)->e_flags; 525 526 #ifdef DEBUG 527 _bfd_error_handler ("%B: old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s", 528 ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no"); 529 #endif 530 531 if (!elf_flags_init (obfd)) 532 { 533 old_flags = new_flags; 534 elf_flags_init (obfd) = TRUE; 535 } 536 else if ((new_flags & EF_MT_CPU_MASK) != (old_flags & EF_MT_CPU_MASK)) 537 { 538 /* CPU has changed. This is invalid, because MRISC, MRISC2 and 539 MS2 are not subsets of each other. */ 540 ok = FALSE; 541 } 542 543 if (ok) 544 { 545 obfd->arch_info = ibfd->arch_info; 546 elf_elfheader (obfd)->e_flags = old_flags; 547 } 548 549 return ok; 550 } 551 552 static bfd_boolean 553 mt_elf_print_private_bfd_data (bfd * abfd, void * ptr) 554 { 555 FILE * file = (FILE *) ptr; 556 flagword flags; 557 558 BFD_ASSERT (abfd != NULL && ptr != NULL); 559 560 /* Print normal ELF private data. */ 561 _bfd_elf_print_private_bfd_data (abfd, ptr); 562 563 flags = elf_elfheader (abfd)->e_flags; 564 fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags); 565 566 switch (flags & EF_MT_CPU_MASK) 567 { 568 default: 569 case EF_MT_CPU_MRISC: fprintf (file, " ms1-16-002"); break; 570 case EF_MT_CPU_MRISC2: fprintf (file, " ms1-16-003"); break; 571 case EF_MT_CPU_MS2: fprintf (file, " ms2"); break; 572 } 573 574 fputc ('\n', file); 575 576 return TRUE; 577 } 578 579 580 #define TARGET_BIG_SYM mt_elf32_vec 581 #define TARGET_BIG_NAME "elf32-mt" 582 583 #define ELF_ARCH bfd_arch_mt 584 #define ELF_MACHINE_CODE EM_MT 585 #define ELF_MAXPAGESIZE 1 /* No pages on the MT. */ 586 587 #define elf_info_to_howto_rel NULL 588 #define elf_info_to_howto mt_info_to_howto_rela 589 590 #define elf_backend_relocate_section mt_elf_relocate_section 591 592 #define bfd_elf32_bfd_reloc_type_lookup mt_reloc_type_lookup 593 #define bfd_elf32_bfd_reloc_name_lookup mt_reloc_name_lookup 594 595 #define elf_backend_check_relocs mt_elf_check_relocs 596 #define elf_backend_object_p mt_elf_object_p 597 #define elf_backend_rela_normal 1 598 599 #define elf_backend_can_gc_sections 1 600 601 #define bfd_elf32_bfd_set_private_flags mt_elf_set_private_flags 602 #define bfd_elf32_bfd_merge_private_bfd_data mt_elf_merge_private_bfd_data 603 #define bfd_elf32_bfd_print_private_bfd_data mt_elf_print_private_bfd_data 604 605 #include "elf32-target.h" 606