1 /* Morpho Technologies MT specific support for 32-bit ELF 2 Copyright (C) 2001-2020 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 #include "sysdep.h" 22 #include "bfd.h" 23 #include "libbfd.h" 24 #include "elf-bfd.h" 25 #include "elf/mt.h" 26 27 /* Prototypes. */ 28 static reloc_howto_type * mt_reloc_type_lookup 29 (bfd *, bfd_reloc_code_real_type); 30 31 static bfd_boolean 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 bfd_boolean 231 mt_info_to_howto_rela (bfd * abfd, 232 arelent * cache_ptr, 233 Elf_Internal_Rela * dst) 234 { 235 unsigned int r_type; 236 237 r_type = ELF32_R_TYPE (dst->r_info); 238 if (r_type >= (unsigned int) R_MT_max) 239 { 240 /* xgettext:c-format */ 241 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 242 abfd, r_type); 243 bfd_set_error (bfd_error_bad_value); 244 return FALSE; 245 } 246 cache_ptr->howto = & mt_elf_howto_table [r_type]; 247 return TRUE; 248 } 249 250 /* Perform a single relocation. By default we use the standard BFD 251 routines. */ 252 253 static bfd_reloc_status_type 254 mt_final_link_relocate 255 (reloc_howto_type * howto, 256 bfd * input_bfd, 257 asection * input_section, 258 bfd_byte * contents, 259 Elf_Internal_Rela * rel, 260 bfd_vma relocation) 261 { 262 return _bfd_final_link_relocate (howto, input_bfd, input_section, 263 contents, rel->r_offset, 264 relocation, rel->r_addend); 265 } 266 267 /* Relocate a MT ELF section. 268 There is some attempt to make this function usable for many architectures, 269 both USE_REL and USE_RELA ['twould be nice if such a critter existed], 270 if only to serve as a learning tool. 271 272 The RELOCATE_SECTION function is called by the new ELF backend linker 273 to handle the relocations for a section. 274 275 The relocs are always passed as Rela structures; if the section 276 actually uses Rel structures, the r_addend field will always be 277 zero. 278 279 This function is responsible for adjusting the section contents as 280 necessary, and (if using Rela relocs and generating a relocatable 281 output file) adjusting the reloc addend as necessary. 282 283 This function does not have to worry about setting the reloc 284 address or the reloc symbol index. 285 286 LOCAL_SYMS is a pointer to the swapped in local symbols. 287 288 LOCAL_SECTIONS is an array giving the section in the input file 289 corresponding to the st_shndx field of each local symbol. 290 291 The global hash table entry for the global symbols can be found 292 via elf_sym_hashes (input_bfd). 293 294 When generating relocatable output, this function must handle 295 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 296 going to be the section symbol corresponding to the output 297 section, which means that the addend must be adjusted 298 accordingly. */ 299 300 static bfd_boolean 301 mt_elf_relocate_section 302 (bfd * output_bfd ATTRIBUTE_UNUSED, 303 struct bfd_link_info * info, 304 bfd * input_bfd, 305 asection * input_section, 306 bfd_byte * contents, 307 Elf_Internal_Rela * relocs, 308 Elf_Internal_Sym * local_syms, 309 asection ** local_sections) 310 { 311 Elf_Internal_Shdr * symtab_hdr; 312 struct elf_link_hash_entry ** sym_hashes; 313 Elf_Internal_Rela * rel; 314 Elf_Internal_Rela * relend; 315 316 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 317 sym_hashes = elf_sym_hashes (input_bfd); 318 relend = relocs + input_section->reloc_count; 319 320 for (rel = relocs; rel < relend; rel ++) 321 { 322 reloc_howto_type * howto; 323 unsigned long r_symndx; 324 Elf_Internal_Sym * sym; 325 asection * sec; 326 struct elf_link_hash_entry * h; 327 bfd_vma relocation; 328 bfd_reloc_status_type r; 329 const char * name = NULL; 330 int r_type; 331 332 r_type = ELF32_R_TYPE (rel->r_info); 333 334 r_symndx = ELF32_R_SYM (rel->r_info); 335 336 howto = mt_elf_howto_table + ELF32_R_TYPE (rel->r_info); 337 h = NULL; 338 sym = NULL; 339 sec = NULL; 340 341 if (r_symndx < symtab_hdr->sh_info) 342 { 343 sym = local_syms + r_symndx; 344 sec = local_sections [r_symndx]; 345 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 346 347 name = bfd_elf_string_from_elf_section 348 (input_bfd, symtab_hdr->sh_link, sym->st_name); 349 name = name == NULL ? bfd_section_name (sec) : name; 350 } 351 else 352 { 353 bfd_boolean unresolved_reloc; 354 bfd_boolean warned, ignored; 355 356 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 357 r_symndx, symtab_hdr, sym_hashes, 358 h, sec, relocation, 359 unresolved_reloc, warned, ignored); 360 361 name = h->root.root.string; 362 } 363 364 if (sec != NULL && discarded_section (sec)) 365 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 366 rel, 1, relend, howto, 0, contents); 367 368 if (bfd_link_relocatable (info)) 369 continue; 370 371 /* Finally, the sole MT-specific part. */ 372 switch (r_type) 373 { 374 case R_MT_HI16: 375 r = mt_elf_relocate_hi16 (input_bfd, rel, contents, relocation); 376 break; 377 default: 378 r = mt_final_link_relocate (howto, input_bfd, input_section, 379 contents, rel, relocation); 380 break; 381 } 382 383 384 if (r != bfd_reloc_ok) 385 { 386 const char * msg = (const char *) NULL; 387 388 switch (r) 389 { 390 case bfd_reloc_overflow: 391 (*info->callbacks->reloc_overflow) 392 (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0, 393 input_bfd, input_section, rel->r_offset); 394 break; 395 396 case bfd_reloc_undefined: 397 (*info->callbacks->undefined_symbol) 398 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 399 break; 400 401 case bfd_reloc_outofrange: 402 msg = _("internal error: out of range error"); 403 break; 404 405 case bfd_reloc_dangerous: 406 msg = _("internal error: dangerous relocation"); 407 break; 408 409 default: 410 msg = _("internal error: unknown error"); 411 break; 412 } 413 414 if (msg) 415 (*info->callbacks->warning) (info, msg, name, input_bfd, 416 input_section, rel->r_offset); 417 } 418 } 419 420 return TRUE; 421 } 422 423 /* Look through the relocs for a section during the first phase. 424 Since we don't do .gots or .plts, we just need to consider the 425 virtual table relocs for gc. */ 426 427 static bfd_boolean 428 mt_elf_check_relocs 429 (bfd * abfd, 430 struct bfd_link_info * info, 431 asection * sec, 432 const Elf_Internal_Rela * relocs) 433 { 434 Elf_Internal_Shdr * symtab_hdr; 435 struct elf_link_hash_entry ** sym_hashes; 436 const Elf_Internal_Rela * rel; 437 const Elf_Internal_Rela * rel_end; 438 439 if (bfd_link_relocatable (info)) 440 return TRUE; 441 442 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 443 sym_hashes = elf_sym_hashes (abfd); 444 445 rel_end = relocs + sec->reloc_count; 446 for (rel = relocs; rel < rel_end; rel++) 447 { 448 struct elf_link_hash_entry *h; 449 unsigned long r_symndx; 450 451 r_symndx = ELF32_R_SYM (rel->r_info); 452 if (r_symndx < symtab_hdr->sh_info) 453 h = NULL; 454 else 455 { 456 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 457 while (h->root.type == bfd_link_hash_indirect 458 || h->root.type == bfd_link_hash_warning) 459 h = (struct elf_link_hash_entry *) h->root.u.i.link; 460 } 461 } 462 463 return TRUE; 464 } 465 466 /* Return the MACH for an e_flags value. */ 467 468 static int 469 elf32_mt_machine (bfd *abfd) 470 { 471 switch (elf_elfheader (abfd)->e_flags & EF_MT_CPU_MASK) 472 { 473 case EF_MT_CPU_MRISC: return bfd_mach_ms1; 474 case EF_MT_CPU_MRISC2: return bfd_mach_mrisc2; 475 case EF_MT_CPU_MS2: return bfd_mach_ms2; 476 } 477 478 return bfd_mach_ms1; 479 } 480 481 static bfd_boolean 482 mt_elf_object_p (bfd * abfd) 483 { 484 bfd_default_set_arch_mach (abfd, bfd_arch_mt, elf32_mt_machine (abfd)); 485 486 return TRUE; 487 } 488 489 /* Function to set the ELF flag bits. */ 490 491 static bfd_boolean 492 mt_elf_set_private_flags (bfd * abfd, 493 flagword flags) 494 { 495 elf_elfheader (abfd)->e_flags = flags; 496 elf_flags_init (abfd) = TRUE; 497 return TRUE; 498 } 499 500 /* Merge backend specific data from an object file to the output 501 object file when linking. */ 502 503 static bfd_boolean 504 mt_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 505 { 506 bfd *obfd = info->output_bfd; 507 flagword old_flags, new_flags; 508 bfd_boolean ok = TRUE; 509 510 /* Check if we have the same endianness. */ 511 if (!_bfd_generic_verify_endian_match (ibfd, info)) 512 return FALSE; 513 514 /* If they're not both mt, then merging is meaningless, so just 515 don't do it. */ 516 if (strcmp (ibfd->arch_info->arch_name, "mt") != 0) 517 return TRUE; 518 if (strcmp (obfd->arch_info->arch_name, "mt") != 0) 519 return TRUE; 520 521 new_flags = elf_elfheader (ibfd)->e_flags; 522 old_flags = elf_elfheader (obfd)->e_flags; 523 524 #ifdef DEBUG 525 _bfd_error_handler ("%pB: old_flags = 0x%.8x, new_flags = 0x%.8x, init = %s", 526 ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no"); 527 #endif 528 529 if (!elf_flags_init (obfd)) 530 { 531 old_flags = new_flags; 532 elf_flags_init (obfd) = TRUE; 533 } 534 else if ((new_flags & EF_MT_CPU_MASK) != (old_flags & EF_MT_CPU_MASK)) 535 { 536 /* CPU has changed. This is invalid, because MRISC, MRISC2 and 537 MS2 are not subsets of each other. */ 538 ok = FALSE; 539 } 540 541 if (ok) 542 { 543 obfd->arch_info = ibfd->arch_info; 544 elf_elfheader (obfd)->e_flags = old_flags; 545 } 546 547 return ok; 548 } 549 550 static bfd_boolean 551 mt_elf_print_private_bfd_data (bfd * abfd, void * ptr) 552 { 553 FILE * file = (FILE *) ptr; 554 flagword flags; 555 556 BFD_ASSERT (abfd != NULL && ptr != NULL); 557 558 /* Print normal ELF private data. */ 559 _bfd_elf_print_private_bfd_data (abfd, ptr); 560 561 flags = elf_elfheader (abfd)->e_flags; 562 fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags); 563 564 switch (flags & EF_MT_CPU_MASK) 565 { 566 default: 567 case EF_MT_CPU_MRISC: fprintf (file, " ms1-16-002"); break; 568 case EF_MT_CPU_MRISC2: fprintf (file, " ms1-16-003"); break; 569 case EF_MT_CPU_MS2: fprintf (file, " ms2"); break; 570 } 571 572 fputc ('\n', file); 573 574 return TRUE; 575 } 576 577 578 #define TARGET_BIG_SYM mt_elf32_vec 579 #define TARGET_BIG_NAME "elf32-mt" 580 581 #define ELF_ARCH bfd_arch_mt 582 #define ELF_MACHINE_CODE EM_MT 583 #define ELF_MAXPAGESIZE 1 /* No pages on the MT. */ 584 585 #define elf_info_to_howto_rel NULL 586 #define elf_info_to_howto mt_info_to_howto_rela 587 588 #define elf_backend_relocate_section mt_elf_relocate_section 589 590 #define bfd_elf32_bfd_reloc_type_lookup mt_reloc_type_lookup 591 #define bfd_elf32_bfd_reloc_name_lookup mt_reloc_name_lookup 592 593 #define elf_backend_check_relocs mt_elf_check_relocs 594 #define elf_backend_object_p mt_elf_object_p 595 #define elf_backend_rela_normal 1 596 597 #define elf_backend_can_gc_sections 1 598 599 #define bfd_elf32_bfd_set_private_flags mt_elf_set_private_flags 600 #define bfd_elf32_bfd_merge_private_bfd_data mt_elf_merge_private_bfd_data 601 #define bfd_elf32_bfd_print_private_bfd_data mt_elf_print_private_bfd_data 602 603 #include "elf32-target.h" 604