1 /* D10V-specific support for 32-bit ELF 2 Copyright (C) 1996-2016 Free Software Foundation, Inc. 3 Contributed by Martin Hunt (hunt (at) cygnus.com). 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #include "sysdep.h" 23 #include "bfd.h" 24 #include "libbfd.h" 25 #include "elf-bfd.h" 26 #include "elf/d10v.h" 27 28 /* Use REL instead of RELA to save space. */ 29 #define USE_REL 1 30 31 static reloc_howto_type elf_d10v_howto_table[] = 32 { 33 /* This reloc does nothing. */ 34 HOWTO (R_D10V_NONE, /* Type. */ 35 0, /* Rightshift. */ 36 3, /* Size (0 = byte, 1 = short, 2 = long). */ 37 0, /* Bitsize. */ 38 FALSE, /* PC_relative. */ 39 0, /* Bitpos. */ 40 complain_overflow_dont,/* Complain_on_overflow. */ 41 bfd_elf_generic_reloc, /* Special_function. */ 42 "R_D10V_NONE", /* Name. */ 43 FALSE, /* Partial_inplace. */ 44 0, /* Src_mask. */ 45 0, /* Dst_mask. */ 46 FALSE), /* PCrel_offset. */ 47 48 /* An PC Relative 10-bit relocation, shifted by 2, right container. */ 49 HOWTO (R_D10V_10_PCREL_R, /* Type. */ 50 2, /* Rightshift. */ 51 2, /* Size (0 = byte, 1 = short, 2 = long). */ 52 8, /* Bitsize. */ 53 TRUE, /* PC_relative. */ 54 0, /* Bitpos. */ 55 complain_overflow_signed, /* Complain_on_overflow. */ 56 bfd_elf_generic_reloc, /* Special_function. */ 57 "R_D10V_10_PCREL_R", /* Name. */ 58 FALSE, /* Partial_inplace. */ 59 0xff, /* Src_mask. */ 60 0xff, /* Dst_mask. */ 61 TRUE), /* PCrel_offset. */ 62 63 /* An PC Relative 10-bit relocation, shifted by 2, left container. */ 64 HOWTO (R_D10V_10_PCREL_L, /* Type. */ 65 2, /* Rightshift. */ 66 2, /* Size (0 = byte, 1 = short, 2 = long). */ 67 8, /* Bitsize. */ 68 TRUE, /* PC_relative. */ 69 15, /* Bitpos. */ 70 complain_overflow_signed, /* Complain_on_overflow. */ 71 bfd_elf_generic_reloc, /* Special_function. */ 72 "R_D10V_10_PCREL_L", /* Name. */ 73 FALSE, /* Partial_inplace. */ 74 0x07f8000, /* Src_mask. */ 75 0x07f8000, /* Dst_mask. */ 76 TRUE), /* PCrel_offset. */ 77 78 /* A 16 bit absolute relocation. */ 79 HOWTO (R_D10V_16, /* Type. */ 80 0, /* Rightshift. */ 81 1, /* Size (0 = byte, 1 = short, 2 = long). */ 82 16, /* Bitsize. */ 83 FALSE, /* PC_relative. */ 84 0, /* Bitpos. */ 85 complain_overflow_dont,/* Complain_on_overflow. */ 86 bfd_elf_generic_reloc, /* Special_function. */ 87 "R_D10V_16", /* Name. */ 88 FALSE, /* Partial_inplace. */ 89 0xffff, /* Src_mask. */ 90 0xffff, /* Dst_mask. */ 91 FALSE), /* PCrel_offset. */ 92 93 /* An 18 bit absolute relocation, right shifted 2. */ 94 HOWTO (R_D10V_18, /* Type. */ 95 2, /* Rightshift. */ 96 1, /* Size (0 = byte, 1 = short, 2 = long). */ 97 16, /* Bitsize. */ 98 FALSE, /* PC_relative. */ 99 0, /* Bitpos. */ 100 complain_overflow_dont, /* Complain_on_overflow. */ 101 bfd_elf_generic_reloc, /* Special_function. */ 102 "R_D10V_18", /* Name. */ 103 FALSE, /* Partial_inplace. */ 104 0xffff, /* Src_mask. */ 105 0xffff, /* Dst_mask. */ 106 FALSE), /* PCrel_offset. */ 107 108 /* A relative 18 bit relocation, right shifted by 2. */ 109 HOWTO (R_D10V_18_PCREL, /* Type. */ 110 2, /* 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_D10V_18_PCREL", /* Name. */ 118 FALSE, /* Partial_inplace. */ 119 0xffff, /* Src_mask. */ 120 0xffff, /* Dst_mask. */ 121 TRUE), /* PCrel_offset. */ 122 123 /* A 32 bit absolute relocation. */ 124 HOWTO (R_D10V_32, /* Type. */ 125 0, /* Rightshift. */ 126 2, /* Size (0 = byte, 1 = short, 2 = long). */ 127 32, /* Bitsize. */ 128 FALSE, /* PC_relative. */ 129 0, /* Bitpos. */ 130 complain_overflow_dont,/* Complain_on_overflow. */ 131 bfd_elf_generic_reloc, /* Special_function. */ 132 "R_D10V_32", /* Name. */ 133 FALSE, /* Partial_inplace. */ 134 0xffffffff, /* Src_mask. */ 135 0xffffffff, /* Dst_mask. */ 136 FALSE), /* PCrel_offset. */ 137 138 /* GNU extension to record C++ vtable hierarchy. */ 139 HOWTO (R_D10V_GNU_VTINHERIT, /* Type. */ 140 0, /* Rightshift. */ 141 2, /* Size (0 = byte, 1 = short, 2 = long). */ 142 0, /* Bitsize. */ 143 FALSE, /* PC_relative. */ 144 0, /* Bitpos. */ 145 complain_overflow_dont,/* Complain_on_overflow. */ 146 NULL, /* Special_function. */ 147 "R_D10V_GNU_VTINHERIT",/* Name. */ 148 FALSE, /* Partial_inplace. */ 149 0, /* Src_mask. */ 150 0, /* Dst_mask. */ 151 FALSE), /* PCrel_offset. */ 152 153 /* GNU extension to record C++ vtable member usage. */ 154 HOWTO (R_D10V_GNU_VTENTRY, /* Type. */ 155 0, /* Rightshift. */ 156 2, /* Size (0 = byte, 1 = short, 2 = long). */ 157 0, /* Bitsize. */ 158 FALSE, /* PC_relative. */ 159 0, /* Bitpos. */ 160 complain_overflow_dont,/* Complain_on_overflow. */ 161 _bfd_elf_rel_vtable_reloc_fn, /* Special_function. */ 162 "R_D10V_GNU_VTENTRY", /* Name. */ 163 FALSE, /* Partial_inplace. */ 164 0, /* Src_mask. */ 165 0, /* Dst_mask. */ 166 FALSE), /* PCrel_offset. */ 167 }; 168 169 /* Map BFD reloc types to D10V ELF reloc types. */ 170 171 struct d10v_reloc_map 172 { 173 bfd_reloc_code_real_type bfd_reloc_val; 174 unsigned char elf_reloc_val; 175 }; 176 177 static const struct d10v_reloc_map d10v_reloc_map[] = 178 { 179 { BFD_RELOC_NONE, R_D10V_NONE, }, 180 { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R }, 181 { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L }, 182 { BFD_RELOC_16, R_D10V_16 }, 183 { BFD_RELOC_D10V_18, R_D10V_18 }, 184 { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL }, 185 { BFD_RELOC_32, R_D10V_32 }, 186 { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT }, 187 { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY }, 188 }; 189 190 static reloc_howto_type * 191 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 192 bfd_reloc_code_real_type code) 193 { 194 unsigned int i; 195 196 for (i = 0; 197 i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map); 198 i++) 199 if (d10v_reloc_map[i].bfd_reloc_val == code) 200 return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val]; 201 202 return NULL; 203 } 204 205 static reloc_howto_type * 206 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 207 const char *r_name) 208 { 209 unsigned int i; 210 211 for (i = 0; 212 i < sizeof (elf_d10v_howto_table) / sizeof (elf_d10v_howto_table[0]); 213 i++) 214 if (elf_d10v_howto_table[i].name != NULL 215 && strcasecmp (elf_d10v_howto_table[i].name, r_name) == 0) 216 return &elf_d10v_howto_table[i]; 217 218 return NULL; 219 } 220 221 /* Set the howto pointer for an D10V ELF reloc. */ 222 223 static void 224 d10v_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, 225 arelent *cache_ptr, 226 Elf_Internal_Rela *dst) 227 { 228 unsigned int r_type; 229 230 r_type = ELF32_R_TYPE (dst->r_info); 231 if (r_type >= (unsigned int) R_D10V_max) 232 { 233 _bfd_error_handler (_("%B: invalid D10V reloc number: %d"), abfd, r_type); 234 r_type = 0; 235 } 236 cache_ptr->howto = &elf_d10v_howto_table[r_type]; 237 } 238 239 static asection * 240 elf32_d10v_gc_mark_hook (asection *sec, 241 struct bfd_link_info *info, 242 Elf_Internal_Rela *rel, 243 struct elf_link_hash_entry *h, 244 Elf_Internal_Sym *sym) 245 { 246 if (h != NULL) 247 switch (ELF32_R_TYPE (rel->r_info)) 248 { 249 case R_D10V_GNU_VTINHERIT: 250 case R_D10V_GNU_VTENTRY: 251 return NULL; 252 } 253 254 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 255 } 256 257 /* Look through the relocs for a section during the first phase. 258 Since we don't do .gots or .plts, we just need to consider the 259 virtual table relocs for gc. */ 260 261 static bfd_boolean 262 elf32_d10v_check_relocs (bfd *abfd, 263 struct bfd_link_info *info, 264 asection *sec, 265 const Elf_Internal_Rela *relocs) 266 { 267 Elf_Internal_Shdr *symtab_hdr; 268 struct elf_link_hash_entry **sym_hashes; 269 const Elf_Internal_Rela *rel; 270 const Elf_Internal_Rela *rel_end; 271 272 if (bfd_link_relocatable (info)) 273 return TRUE; 274 275 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 276 sym_hashes = elf_sym_hashes (abfd); 277 278 rel_end = relocs + sec->reloc_count; 279 for (rel = relocs; rel < rel_end; rel++) 280 { 281 struct elf_link_hash_entry *h; 282 unsigned long r_symndx; 283 284 r_symndx = ELF32_R_SYM (rel->r_info); 285 if (r_symndx < symtab_hdr->sh_info) 286 h = NULL; 287 else 288 { 289 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 290 while (h->root.type == bfd_link_hash_indirect 291 || h->root.type == bfd_link_hash_warning) 292 h = (struct elf_link_hash_entry *) h->root.u.i.link; 293 294 /* PR15323, ref flags aren't set for references in the same 295 object. */ 296 h->root.non_ir_ref = 1; 297 } 298 299 switch (ELF32_R_TYPE (rel->r_info)) 300 { 301 /* This relocation describes the C++ object vtable hierarchy. 302 Reconstruct it for later use during GC. */ 303 case R_D10V_GNU_VTINHERIT: 304 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 305 return FALSE; 306 break; 307 308 /* This relocation describes which C++ vtable entries are actually 309 used. Record for later use during GC. */ 310 case R_D10V_GNU_VTENTRY: 311 BFD_ASSERT (h != NULL); 312 if (h != NULL 313 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 314 return FALSE; 315 break; 316 } 317 } 318 319 return TRUE; 320 } 321 322 static bfd_vma 323 extract_rel_addend (bfd *abfd, 324 bfd_byte *where, 325 reloc_howto_type *howto) 326 { 327 bfd_vma insn, val; 328 329 switch (howto->size) 330 { 331 case 0: 332 insn = bfd_get_8 (abfd, where); 333 break; 334 case 1: 335 insn = bfd_get_16 (abfd, where); 336 break; 337 case 2: 338 insn = bfd_get_32 (abfd, where); 339 break; 340 default: 341 abort (); 342 } 343 344 val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift; 345 /* We should really be testing for signed addends here, but we don't 346 have that info directly in the howto. */ 347 if (howto->pc_relative) 348 { 349 bfd_vma sign; 350 sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1)); 351 sign = sign >> howto->bitpos << howto->rightshift; 352 val = (val ^ sign) - sign; 353 } 354 return val; 355 } 356 357 static void 358 insert_rel_addend (bfd *abfd, 359 bfd_byte *where, 360 reloc_howto_type *howto, 361 bfd_vma addend) 362 { 363 bfd_vma insn; 364 365 addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask; 366 insn = ~howto->dst_mask; 367 switch (howto->size) 368 { 369 case 0: 370 insn &= bfd_get_8 (abfd, where); 371 insn |= addend; 372 bfd_put_8 (abfd, insn, where); 373 break; 374 case 1: 375 insn &= bfd_get_16 (abfd, where); 376 insn |= addend; 377 bfd_put_16 (abfd, insn, where); 378 break; 379 case 2: 380 insn &= bfd_get_32 (abfd, where); 381 insn |= addend; 382 bfd_put_32 (abfd, insn, where); 383 break; 384 default: 385 abort (); 386 } 387 } 388 389 /* Relocate a D10V ELF section. */ 390 391 static bfd_boolean 392 elf32_d10v_relocate_section (bfd *output_bfd, 393 struct bfd_link_info *info, 394 bfd *input_bfd, 395 asection *input_section, 396 bfd_byte *contents, 397 Elf_Internal_Rela *relocs, 398 Elf_Internal_Sym *local_syms, 399 asection **local_sections) 400 { 401 Elf_Internal_Shdr *symtab_hdr; 402 struct elf_link_hash_entry **sym_hashes; 403 Elf_Internal_Rela *rel, *relend; 404 const char *name; 405 406 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 407 sym_hashes = elf_sym_hashes (input_bfd); 408 409 rel = relocs; 410 relend = relocs + input_section->reloc_count; 411 for (; rel < relend; rel++) 412 { 413 int r_type; 414 reloc_howto_type *howto; 415 unsigned long r_symndx; 416 Elf_Internal_Sym *sym; 417 asection *sec; 418 struct elf_link_hash_entry *h; 419 bfd_vma relocation; 420 bfd_reloc_status_type r; 421 422 r_symndx = ELF32_R_SYM (rel->r_info); 423 r_type = ELF32_R_TYPE (rel->r_info); 424 425 if (r_type == R_D10V_GNU_VTENTRY 426 || r_type == R_D10V_GNU_VTINHERIT) 427 continue; 428 429 howto = elf_d10v_howto_table + r_type; 430 h = NULL; 431 sym = NULL; 432 sec = NULL; 433 if (r_symndx < symtab_hdr->sh_info) 434 { 435 sym = local_syms + r_symndx; 436 sec = local_sections[r_symndx]; 437 relocation = (sec->output_section->vma 438 + sec->output_offset 439 + sym->st_value); 440 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION 441 && ((sec->flags & SEC_MERGE) != 0 442 || (bfd_link_relocatable (info) 443 && sec->output_offset != 0))) 444 { 445 bfd_vma addend; 446 bfd_byte *where = contents + rel->r_offset; 447 448 addend = extract_rel_addend (input_bfd, where, howto); 449 450 if (bfd_link_relocatable (info)) 451 addend += sec->output_offset; 452 else 453 { 454 asection *msec = sec; 455 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, 456 addend); 457 addend -= relocation; 458 addend += msec->output_section->vma + msec->output_offset; 459 } 460 insert_rel_addend (input_bfd, where, howto, addend); 461 } 462 } 463 else 464 { 465 bfd_boolean unresolved_reloc, warned, ignored; 466 467 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 468 r_symndx, symtab_hdr, sym_hashes, 469 h, sec, relocation, 470 unresolved_reloc, warned, ignored); 471 } 472 473 if (sec != NULL && discarded_section (sec)) 474 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 475 rel, 1, relend, howto, 0, contents); 476 477 if (bfd_link_relocatable (info)) 478 continue; 479 480 if (h != NULL) 481 name = h->root.root.string; 482 else 483 { 484 name = (bfd_elf_string_from_elf_section 485 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 486 if (name == NULL || *name == '\0') 487 name = bfd_section_name (input_bfd, sec); 488 } 489 490 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 491 contents, rel->r_offset, 492 relocation, (bfd_vma) 0); 493 494 if (r != bfd_reloc_ok) 495 { 496 const char * msg = (const char *) 0; 497 498 switch (r) 499 { 500 case bfd_reloc_overflow: 501 (*info->callbacks->reloc_overflow) 502 (info, (h ? &h->root : NULL), name, howto->name, 503 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 504 break; 505 506 case bfd_reloc_undefined: 507 (*info->callbacks->undefined_symbol) 508 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 509 break; 510 511 case bfd_reloc_outofrange: 512 msg = _("internal error: out of range error"); 513 goto common_error; 514 515 case bfd_reloc_notsupported: 516 msg = _("internal error: unsupported relocation error"); 517 goto common_error; 518 519 case bfd_reloc_dangerous: 520 msg = _("internal error: dangerous error"); 521 goto common_error; 522 523 default: 524 msg = _("internal error: unknown error"); 525 /* fall through */ 526 527 common_error: 528 (*info->callbacks->warning) (info, msg, name, input_bfd, 529 input_section, rel->r_offset); 530 break; 531 } 532 } 533 } 534 535 return TRUE; 536 } 537 #define ELF_ARCH bfd_arch_d10v 538 #define ELF_MACHINE_CODE EM_D10V 539 #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V 540 #define ELF_MAXPAGESIZE 0x1000 541 542 #define TARGET_BIG_SYM d10v_elf32_vec 543 #define TARGET_BIG_NAME "elf32-d10v" 544 545 #define elf_info_to_howto 0 546 #define elf_info_to_howto_rel d10v_info_to_howto_rel 547 #define elf_backend_object_p 0 548 #define elf_backend_final_write_processing 0 549 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook 550 #define elf_backend_check_relocs elf32_d10v_check_relocs 551 #define elf_backend_relocate_section elf32_d10v_relocate_section 552 #define elf_backend_can_gc_sections 1 553 554 #include "elf32-target.h" 555
