1 /* D10V-specific support for 32-bit ELF 2 Copyright (C) 1996-2014 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 2, /* Size (0 = byte, 1 = short, 2 = long). */ 37 32, /* 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 BFD_ASSERT (r_type < (unsigned int) R_D10V_max); 232 cache_ptr->howto = &elf_d10v_howto_table[r_type]; 233 } 234 235 static asection * 236 elf32_d10v_gc_mark_hook (asection *sec, 237 struct bfd_link_info *info, 238 Elf_Internal_Rela *rel, 239 struct elf_link_hash_entry *h, 240 Elf_Internal_Sym *sym) 241 { 242 if (h != NULL) 243 switch (ELF32_R_TYPE (rel->r_info)) 244 { 245 case R_D10V_GNU_VTINHERIT: 246 case R_D10V_GNU_VTENTRY: 247 return NULL; 248 } 249 250 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 251 } 252 253 /* Look through the relocs for a section during the first phase. 254 Since we don't do .gots or .plts, we just need to consider the 255 virtual table relocs for gc. */ 256 257 static bfd_boolean 258 elf32_d10v_check_relocs (bfd *abfd, 259 struct bfd_link_info *info, 260 asection *sec, 261 const Elf_Internal_Rela *relocs) 262 { 263 Elf_Internal_Shdr *symtab_hdr; 264 struct elf_link_hash_entry **sym_hashes; 265 const Elf_Internal_Rela *rel; 266 const Elf_Internal_Rela *rel_end; 267 268 if (info->relocatable) 269 return TRUE; 270 271 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 272 sym_hashes = elf_sym_hashes (abfd); 273 274 rel_end = relocs + sec->reloc_count; 275 for (rel = relocs; rel < rel_end; rel++) 276 { 277 struct elf_link_hash_entry *h; 278 unsigned long r_symndx; 279 280 r_symndx = ELF32_R_SYM (rel->r_info); 281 if (r_symndx < symtab_hdr->sh_info) 282 h = NULL; 283 else 284 { 285 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 286 while (h->root.type == bfd_link_hash_indirect 287 || h->root.type == bfd_link_hash_warning) 288 h = (struct elf_link_hash_entry *) h->root.u.i.link; 289 290 /* PR15323, ref flags aren't set for references in the same 291 object. */ 292 h->root.non_ir_ref = 1; 293 } 294 295 switch (ELF32_R_TYPE (rel->r_info)) 296 { 297 /* This relocation describes the C++ object vtable hierarchy. 298 Reconstruct it for later use during GC. */ 299 case R_D10V_GNU_VTINHERIT: 300 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 301 return FALSE; 302 break; 303 304 /* This relocation describes which C++ vtable entries are actually 305 used. Record for later use during GC. */ 306 case R_D10V_GNU_VTENTRY: 307 BFD_ASSERT (h != NULL); 308 if (h != NULL 309 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 310 return FALSE; 311 break; 312 } 313 } 314 315 return TRUE; 316 } 317 318 static bfd_vma 319 extract_rel_addend (bfd *abfd, 320 bfd_byte *where, 321 reloc_howto_type *howto) 322 { 323 bfd_vma insn, val; 324 325 switch (howto->size) 326 { 327 case 0: 328 insn = bfd_get_8 (abfd, where); 329 break; 330 case 1: 331 insn = bfd_get_16 (abfd, where); 332 break; 333 case 2: 334 insn = bfd_get_32 (abfd, where); 335 break; 336 default: 337 abort (); 338 } 339 340 val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift; 341 /* We should really be testing for signed addends here, but we don't 342 have that info directly in the howto. */ 343 if (howto->pc_relative) 344 { 345 bfd_vma sign; 346 sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1)); 347 sign = sign >> howto->bitpos << howto->rightshift; 348 val = (val ^ sign) - sign; 349 } 350 return val; 351 } 352 353 static void 354 insert_rel_addend (bfd *abfd, 355 bfd_byte *where, 356 reloc_howto_type *howto, 357 bfd_vma addend) 358 { 359 bfd_vma insn; 360 361 addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask; 362 insn = ~howto->dst_mask; 363 switch (howto->size) 364 { 365 case 0: 366 insn &= bfd_get_8 (abfd, where); 367 insn |= addend; 368 bfd_put_8 (abfd, insn, where); 369 break; 370 case 1: 371 insn &= bfd_get_16 (abfd, where); 372 insn |= addend; 373 bfd_put_16 (abfd, insn, where); 374 break; 375 case 2: 376 insn &= bfd_get_32 (abfd, where); 377 insn |= addend; 378 bfd_put_32 (abfd, insn, where); 379 break; 380 default: 381 abort (); 382 } 383 } 384 385 /* Relocate a D10V ELF section. */ 386 387 static bfd_boolean 388 elf32_d10v_relocate_section (bfd *output_bfd, 389 struct bfd_link_info *info, 390 bfd *input_bfd, 391 asection *input_section, 392 bfd_byte *contents, 393 Elf_Internal_Rela *relocs, 394 Elf_Internal_Sym *local_syms, 395 asection **local_sections) 396 { 397 Elf_Internal_Shdr *symtab_hdr; 398 struct elf_link_hash_entry **sym_hashes; 399 Elf_Internal_Rela *rel, *relend; 400 const char *name; 401 402 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 403 sym_hashes = elf_sym_hashes (input_bfd); 404 405 rel = relocs; 406 relend = relocs + input_section->reloc_count; 407 for (; rel < relend; rel++) 408 { 409 int r_type; 410 reloc_howto_type *howto; 411 unsigned long r_symndx; 412 Elf_Internal_Sym *sym; 413 asection *sec; 414 struct elf_link_hash_entry *h; 415 bfd_vma relocation; 416 bfd_reloc_status_type r; 417 418 r_symndx = ELF32_R_SYM (rel->r_info); 419 r_type = ELF32_R_TYPE (rel->r_info); 420 421 if (r_type == R_D10V_GNU_VTENTRY 422 || r_type == R_D10V_GNU_VTINHERIT) 423 continue; 424 425 howto = elf_d10v_howto_table + r_type; 426 h = NULL; 427 sym = NULL; 428 sec = NULL; 429 if (r_symndx < symtab_hdr->sh_info) 430 { 431 sym = local_syms + r_symndx; 432 sec = local_sections[r_symndx]; 433 relocation = (sec->output_section->vma 434 + sec->output_offset 435 + sym->st_value); 436 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION 437 && ((sec->flags & SEC_MERGE) != 0 438 || (info->relocatable 439 && sec->output_offset != 0))) 440 { 441 bfd_vma addend; 442 bfd_byte *where = contents + rel->r_offset; 443 444 addend = extract_rel_addend (input_bfd, where, howto); 445 446 if (info->relocatable) 447 addend += sec->output_offset; 448 else 449 { 450 asection *msec = sec; 451 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, 452 addend); 453 addend -= relocation; 454 addend += msec->output_section->vma + msec->output_offset; 455 } 456 insert_rel_addend (input_bfd, where, howto, addend); 457 } 458 } 459 else 460 { 461 bfd_boolean unresolved_reloc, warned, ignored; 462 463 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 464 r_symndx, symtab_hdr, sym_hashes, 465 h, sec, relocation, 466 unresolved_reloc, warned, ignored); 467 } 468 469 if (sec != NULL && discarded_section (sec)) 470 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 471 rel, 1, relend, howto, 0, contents); 472 473 if (info->relocatable) 474 continue; 475 476 if (h != NULL) 477 name = h->root.root.string; 478 else 479 { 480 name = (bfd_elf_string_from_elf_section 481 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 482 if (name == NULL || *name == '\0') 483 name = bfd_section_name (input_bfd, sec); 484 } 485 486 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 487 contents, rel->r_offset, 488 relocation, (bfd_vma) 0); 489 490 if (r != bfd_reloc_ok) 491 { 492 const char * msg = (const char *) 0; 493 494 switch (r) 495 { 496 case bfd_reloc_overflow: 497 if (!((*info->callbacks->reloc_overflow) 498 (info, (h ? &h->root : NULL), name, howto->name, 499 (bfd_vma) 0, input_bfd, input_section, 500 rel->r_offset))) 501 return FALSE; 502 break; 503 504 case bfd_reloc_undefined: 505 if (!((*info->callbacks->undefined_symbol) 506 (info, name, input_bfd, input_section, 507 rel->r_offset, TRUE))) 508 return FALSE; 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 if (!((*info->callbacks->warning) 529 (info, msg, name, input_bfd, input_section, 530 rel->r_offset))) 531 return FALSE; 532 break; 533 } 534 } 535 } 536 537 return TRUE; 538 } 539 #define ELF_ARCH bfd_arch_d10v 540 #define ELF_MACHINE_CODE EM_D10V 541 #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V 542 #define ELF_MAXPAGESIZE 0x1000 543 544 #define TARGET_BIG_SYM d10v_elf32_vec 545 #define TARGET_BIG_NAME "elf32-d10v" 546 547 #define elf_info_to_howto 0 548 #define elf_info_to_howto_rel d10v_info_to_howto_rel 549 #define elf_backend_object_p 0 550 #define elf_backend_final_write_processing 0 551 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook 552 #define elf_backend_check_relocs elf32_d10v_check_relocs 553 #define elf_backend_relocate_section elf32_d10v_relocate_section 554 #define elf_backend_can_gc_sections 1 555 556 #include "elf32-target.h" 557
