elf32-d10v.c revision 1.7
1 /* D10V-specific support for 32-bit ELF 2 Copyright (C) 1996-2017 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 /* xgettext:c-format */ 234 _bfd_error_handler (_("%B: invalid D10V reloc number: %d"), abfd, r_type); 235 r_type = 0; 236 } 237 cache_ptr->howto = &elf_d10v_howto_table[r_type]; 238 } 239 240 static asection * 241 elf32_d10v_gc_mark_hook (asection *sec, 242 struct bfd_link_info *info, 243 Elf_Internal_Rela *rel, 244 struct elf_link_hash_entry *h, 245 Elf_Internal_Sym *sym) 246 { 247 if (h != NULL) 248 switch (ELF32_R_TYPE (rel->r_info)) 249 { 250 case R_D10V_GNU_VTINHERIT: 251 case R_D10V_GNU_VTENTRY: 252 return NULL; 253 } 254 255 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 256 } 257 258 /* Look through the relocs for a section during the first phase. 259 Since we don't do .gots or .plts, we just need to consider the 260 virtual table relocs for gc. */ 261 262 static bfd_boolean 263 elf32_d10v_check_relocs (bfd *abfd, 264 struct bfd_link_info *info, 265 asection *sec, 266 const Elf_Internal_Rela *relocs) 267 { 268 Elf_Internal_Shdr *symtab_hdr; 269 struct elf_link_hash_entry **sym_hashes; 270 const Elf_Internal_Rela *rel; 271 const Elf_Internal_Rela *rel_end; 272 273 if (bfd_link_relocatable (info)) 274 return TRUE; 275 276 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 277 sym_hashes = elf_sym_hashes (abfd); 278 279 rel_end = relocs + sec->reloc_count; 280 for (rel = relocs; rel < rel_end; rel++) 281 { 282 struct elf_link_hash_entry *h; 283 unsigned long r_symndx; 284 285 r_symndx = ELF32_R_SYM (rel->r_info); 286 if (r_symndx < symtab_hdr->sh_info) 287 h = NULL; 288 else 289 { 290 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 291 while (h->root.type == bfd_link_hash_indirect 292 || h->root.type == bfd_link_hash_warning) 293 h = (struct elf_link_hash_entry *) h->root.u.i.link; 294 295 /* PR15323, ref flags aren't set for references in the same 296 object. */ 297 h->root.non_ir_ref = 1; 298 } 299 300 switch (ELF32_R_TYPE (rel->r_info)) 301 { 302 /* This relocation describes the C++ object vtable hierarchy. 303 Reconstruct it for later use during GC. */ 304 case R_D10V_GNU_VTINHERIT: 305 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 306 return FALSE; 307 break; 308 309 /* This relocation describes which C++ vtable entries are actually 310 used. Record for later use during GC. */ 311 case R_D10V_GNU_VTENTRY: 312 BFD_ASSERT (h != NULL); 313 if (h != NULL 314 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 315 return FALSE; 316 break; 317 } 318 } 319 320 return TRUE; 321 } 322 323 static bfd_vma 324 extract_rel_addend (bfd *abfd, 325 bfd_byte *where, 326 reloc_howto_type *howto) 327 { 328 bfd_vma insn, val; 329 330 switch (howto->size) 331 { 332 case 0: 333 insn = bfd_get_8 (abfd, where); 334 break; 335 case 1: 336 insn = bfd_get_16 (abfd, where); 337 break; 338 case 2: 339 insn = bfd_get_32 (abfd, where); 340 break; 341 default: 342 abort (); 343 } 344 345 val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift; 346 /* We should really be testing for signed addends here, but we don't 347 have that info directly in the howto. */ 348 if (howto->pc_relative) 349 { 350 bfd_vma sign; 351 sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1)); 352 sign = sign >> howto->bitpos << howto->rightshift; 353 val = (val ^ sign) - sign; 354 } 355 return val; 356 } 357 358 static void 359 insert_rel_addend (bfd *abfd, 360 bfd_byte *where, 361 reloc_howto_type *howto, 362 bfd_vma addend) 363 { 364 bfd_vma insn; 365 366 addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask; 367 insn = ~howto->dst_mask; 368 switch (howto->size) 369 { 370 case 0: 371 insn &= bfd_get_8 (abfd, where); 372 insn |= addend; 373 bfd_put_8 (abfd, insn, where); 374 break; 375 case 1: 376 insn &= bfd_get_16 (abfd, where); 377 insn |= addend; 378 bfd_put_16 (abfd, insn, where); 379 break; 380 case 2: 381 insn &= bfd_get_32 (abfd, where); 382 insn |= addend; 383 bfd_put_32 (abfd, insn, where); 384 break; 385 default: 386 abort (); 387 } 388 } 389 390 /* Relocate a D10V ELF section. */ 391 392 static bfd_boolean 393 elf32_d10v_relocate_section (bfd *output_bfd, 394 struct bfd_link_info *info, 395 bfd *input_bfd, 396 asection *input_section, 397 bfd_byte *contents, 398 Elf_Internal_Rela *relocs, 399 Elf_Internal_Sym *local_syms, 400 asection **local_sections) 401 { 402 Elf_Internal_Shdr *symtab_hdr; 403 struct elf_link_hash_entry **sym_hashes; 404 Elf_Internal_Rela *rel, *relend; 405 const char *name; 406 407 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 408 sym_hashes = elf_sym_hashes (input_bfd); 409 410 rel = relocs; 411 relend = relocs + input_section->reloc_count; 412 for (; rel < relend; rel++) 413 { 414 int r_type; 415 reloc_howto_type *howto; 416 unsigned long r_symndx; 417 Elf_Internal_Sym *sym; 418 asection *sec; 419 struct elf_link_hash_entry *h; 420 bfd_vma relocation; 421 bfd_reloc_status_type r; 422 423 r_symndx = ELF32_R_SYM (rel->r_info); 424 r_type = ELF32_R_TYPE (rel->r_info); 425 426 if (r_type == R_D10V_GNU_VTENTRY 427 || r_type == R_D10V_GNU_VTINHERIT) 428 continue; 429 430 howto = elf_d10v_howto_table + r_type; 431 h = NULL; 432 sym = NULL; 433 sec = NULL; 434 if (r_symndx < symtab_hdr->sh_info) 435 { 436 sym = local_syms + r_symndx; 437 sec = local_sections[r_symndx]; 438 relocation = (sec->output_section->vma 439 + sec->output_offset 440 + sym->st_value); 441 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION 442 && ((sec->flags & SEC_MERGE) != 0 443 || (bfd_link_relocatable (info) 444 && sec->output_offset != 0))) 445 { 446 bfd_vma addend; 447 bfd_byte *where = contents + rel->r_offset; 448 449 addend = extract_rel_addend (input_bfd, where, howto); 450 451 if (bfd_link_relocatable (info)) 452 addend += sec->output_offset; 453 else 454 { 455 asection *msec = sec; 456 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, 457 addend); 458 addend -= relocation; 459 addend += msec->output_section->vma + msec->output_offset; 460 } 461 insert_rel_addend (input_bfd, where, howto, addend); 462 } 463 } 464 else 465 { 466 bfd_boolean unresolved_reloc, warned, ignored; 467 468 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 469 r_symndx, symtab_hdr, sym_hashes, 470 h, sec, relocation, 471 unresolved_reloc, warned, ignored); 472 } 473 474 if (sec != NULL && discarded_section (sec)) 475 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 476 rel, 1, relend, howto, 0, contents); 477 478 if (bfd_link_relocatable (info)) 479 continue; 480 481 if (h != NULL) 482 name = h->root.root.string; 483 else 484 { 485 name = (bfd_elf_string_from_elf_section 486 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 487 if (name == NULL || *name == '\0') 488 name = bfd_section_name (input_bfd, sec); 489 } 490 491 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 492 contents, rel->r_offset, 493 relocation, (bfd_vma) 0); 494 495 if (r != bfd_reloc_ok) 496 { 497 const char * msg = (const char *) 0; 498 499 switch (r) 500 { 501 case bfd_reloc_overflow: 502 (*info->callbacks->reloc_overflow) 503 (info, (h ? &h->root : NULL), name, howto->name, 504 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 505 break; 506 507 case bfd_reloc_undefined: 508 (*info->callbacks->undefined_symbol) 509 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 510 break; 511 512 case bfd_reloc_outofrange: 513 msg = _("internal error: out of range error"); 514 goto common_error; 515 516 case bfd_reloc_notsupported: 517 msg = _("internal error: unsupported relocation error"); 518 goto common_error; 519 520 case bfd_reloc_dangerous: 521 msg = _("internal error: dangerous error"); 522 goto common_error; 523 524 default: 525 msg = _("internal error: unknown error"); 526 /* fall through */ 527 528 common_error: 529 (*info->callbacks->warning) (info, msg, name, input_bfd, 530 input_section, rel->r_offset); 531 break; 532 } 533 } 534 } 535 536 return TRUE; 537 } 538 #define ELF_ARCH bfd_arch_d10v 539 #define ELF_MACHINE_CODE EM_D10V 540 #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V 541 #define ELF_MAXPAGESIZE 0x1000 542 543 #define TARGET_BIG_SYM d10v_elf32_vec 544 #define TARGET_BIG_NAME "elf32-d10v" 545 546 #define elf_info_to_howto 0 547 #define elf_info_to_howto_rel d10v_info_to_howto_rel 548 #define elf_backend_object_p 0 549 #define elf_backend_final_write_processing 0 550 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook 551 #define elf_backend_check_relocs elf32_d10v_check_relocs 552 #define elf_backend_relocate_section elf32_d10v_relocate_section 553 #define elf_backend_can_gc_sections 1 554 555 #include "elf32-target.h" 556
Indexes created Sun Apr 12 00:22:20 UTC 2026