elf32-d10v.c revision 1.1.1.6.2.2
1 /* D10V-specific support for 32-bit ELF 2 Copyright (C) 1996-2020 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 bfd_boolean 224 d10v_info_to_howto_rel (bfd *abfd, 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 (_("%pB: unsupported relocation type %#x"), 235 abfd, r_type); 236 bfd_set_error (bfd_error_bad_value); 237 return FALSE; 238 } 239 cache_ptr->howto = &elf_d10v_howto_table[r_type]; 240 return TRUE; 241 } 242 243 static asection * 244 elf32_d10v_gc_mark_hook (asection *sec, 245 struct bfd_link_info *info, 246 Elf_Internal_Rela *rel, 247 struct elf_link_hash_entry *h, 248 Elf_Internal_Sym *sym) 249 { 250 if (h != NULL) 251 switch (ELF32_R_TYPE (rel->r_info)) 252 { 253 case R_D10V_GNU_VTINHERIT: 254 case R_D10V_GNU_VTENTRY: 255 return NULL; 256 } 257 258 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 259 } 260 261 /* Look through the relocs for a section during the first phase. 262 Since we don't do .gots or .plts, we just need to consider the 263 virtual table relocs for gc. */ 264 265 static bfd_boolean 266 elf32_d10v_check_relocs (bfd *abfd, 267 struct bfd_link_info *info, 268 asection *sec, 269 const Elf_Internal_Rela *relocs) 270 { 271 Elf_Internal_Shdr *symtab_hdr; 272 struct elf_link_hash_entry **sym_hashes; 273 const Elf_Internal_Rela *rel; 274 const Elf_Internal_Rela *rel_end; 275 276 if (bfd_link_relocatable (info)) 277 return TRUE; 278 279 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 280 sym_hashes = elf_sym_hashes (abfd); 281 282 rel_end = relocs + sec->reloc_count; 283 for (rel = relocs; rel < rel_end; rel++) 284 { 285 struct elf_link_hash_entry *h; 286 unsigned long r_symndx; 287 288 r_symndx = ELF32_R_SYM (rel->r_info); 289 if (r_symndx < symtab_hdr->sh_info) 290 h = NULL; 291 else 292 { 293 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 294 while (h->root.type == bfd_link_hash_indirect 295 || h->root.type == bfd_link_hash_warning) 296 h = (struct elf_link_hash_entry *) h->root.u.i.link; 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 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 312 return FALSE; 313 break; 314 } 315 } 316 317 return TRUE; 318 } 319 320 static bfd_vma 321 extract_rel_addend (bfd *abfd, 322 bfd_byte *where, 323 reloc_howto_type *howto) 324 { 325 bfd_vma insn, val; 326 327 switch (howto->size) 328 { 329 case 0: 330 insn = bfd_get_8 (abfd, where); 331 break; 332 case 1: 333 insn = bfd_get_16 (abfd, where); 334 break; 335 case 2: 336 insn = bfd_get_32 (abfd, where); 337 break; 338 default: 339 abort (); 340 } 341 342 val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift; 343 /* We should really be testing for signed addends here, but we don't 344 have that info directly in the howto. */ 345 if (howto->pc_relative) 346 { 347 bfd_vma sign; 348 sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1)); 349 sign = sign >> howto->bitpos << howto->rightshift; 350 val = (val ^ sign) - sign; 351 } 352 return val; 353 } 354 355 static void 356 insert_rel_addend (bfd *abfd, 357 bfd_byte *where, 358 reloc_howto_type *howto, 359 bfd_vma addend) 360 { 361 bfd_vma insn; 362 363 addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask; 364 insn = ~howto->dst_mask; 365 switch (howto->size) 366 { 367 case 0: 368 insn &= bfd_get_8 (abfd, where); 369 insn |= addend; 370 bfd_put_8 (abfd, insn, where); 371 break; 372 case 1: 373 insn &= bfd_get_16 (abfd, where); 374 insn |= addend; 375 bfd_put_16 (abfd, insn, where); 376 break; 377 case 2: 378 insn &= bfd_get_32 (abfd, where); 379 insn |= addend; 380 bfd_put_32 (abfd, insn, where); 381 break; 382 default: 383 abort (); 384 } 385 } 386 387 /* Relocate a D10V ELF section. */ 388 389 static bfd_boolean 390 elf32_d10v_relocate_section (bfd *output_bfd, 391 struct bfd_link_info *info, 392 bfd *input_bfd, 393 asection *input_section, 394 bfd_byte *contents, 395 Elf_Internal_Rela *relocs, 396 Elf_Internal_Sym *local_syms, 397 asection **local_sections) 398 { 399 Elf_Internal_Shdr *symtab_hdr; 400 struct elf_link_hash_entry **sym_hashes; 401 Elf_Internal_Rela *rel, *relend; 402 const char *name; 403 404 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 405 sym_hashes = elf_sym_hashes (input_bfd); 406 407 rel = relocs; 408 relend = relocs + input_section->reloc_count; 409 for (; rel < relend; rel++) 410 { 411 int r_type; 412 reloc_howto_type *howto; 413 unsigned long r_symndx; 414 Elf_Internal_Sym *sym; 415 asection *sec; 416 struct elf_link_hash_entry *h; 417 bfd_vma relocation; 418 bfd_reloc_status_type r; 419 420 r_symndx = ELF32_R_SYM (rel->r_info); 421 r_type = ELF32_R_TYPE (rel->r_info); 422 423 if (r_type == R_D10V_GNU_VTENTRY 424 || r_type == R_D10V_GNU_VTINHERIT) 425 continue; 426 427 howto = elf_d10v_howto_table + r_type; 428 h = NULL; 429 sym = NULL; 430 sec = NULL; 431 if (r_symndx < symtab_hdr->sh_info) 432 { 433 sym = local_syms + r_symndx; 434 sec = local_sections[r_symndx]; 435 relocation = (sec->output_section->vma 436 + sec->output_offset 437 + sym->st_value); 438 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION 439 && ((sec->flags & SEC_MERGE) != 0 440 || (bfd_link_relocatable (info) 441 && sec->output_offset != 0))) 442 { 443 bfd_vma addend; 444 bfd_byte *where = contents + rel->r_offset; 445 446 addend = extract_rel_addend (input_bfd, where, howto); 447 448 if (bfd_link_relocatable (info)) 449 addend += sec->output_offset; 450 else 451 { 452 asection *msec = sec; 453 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, 454 addend); 455 addend -= relocation; 456 addend += msec->output_section->vma + msec->output_offset; 457 } 458 insert_rel_addend (input_bfd, where, howto, addend); 459 } 460 } 461 else 462 { 463 bfd_boolean unresolved_reloc, warned, ignored; 464 465 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 466 r_symndx, symtab_hdr, sym_hashes, 467 h, sec, relocation, 468 unresolved_reloc, warned, ignored); 469 } 470 471 if (sec != NULL && discarded_section (sec)) 472 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 473 rel, 1, relend, howto, 0, contents); 474 475 if (bfd_link_relocatable (info)) 476 continue; 477 478 if (h != NULL) 479 name = h->root.root.string; 480 else 481 { 482 name = (bfd_elf_string_from_elf_section 483 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 484 if (name == NULL || *name == '\0') 485 name = bfd_section_name (sec); 486 } 487 488 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 489 contents, rel->r_offset, 490 relocation, (bfd_vma) 0); 491 492 if (r != bfd_reloc_ok) 493 { 494 const char * msg = (const char *) 0; 495 496 switch (r) 497 { 498 case bfd_reloc_overflow: 499 (*info->callbacks->reloc_overflow) 500 (info, (h ? &h->root : NULL), name, howto->name, 501 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 502 break; 503 504 case bfd_reloc_undefined: 505 (*info->callbacks->undefined_symbol) 506 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 507 break; 508 509 case bfd_reloc_outofrange: 510 msg = _("internal error: out of range error"); 511 goto common_error; 512 513 case bfd_reloc_notsupported: 514 msg = _("internal error: unsupported relocation error"); 515 goto common_error; 516 517 case bfd_reloc_dangerous: 518 msg = _("internal error: dangerous error"); 519 goto common_error; 520 521 default: 522 msg = _("internal error: unknown error"); 523 /* fall through */ 524 525 common_error: 526 (*info->callbacks->warning) (info, msg, name, input_bfd, 527 input_section, rel->r_offset); 528 break; 529 } 530 } 531 } 532 533 return TRUE; 534 } 535 #define ELF_ARCH bfd_arch_d10v 536 #define ELF_MACHINE_CODE EM_D10V 537 #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V 538 #define ELF_MAXPAGESIZE 0x1000 539 540 #define TARGET_BIG_SYM d10v_elf32_vec 541 #define TARGET_BIG_NAME "elf32-d10v" 542 543 #define elf_info_to_howto NULL 544 #define elf_info_to_howto_rel d10v_info_to_howto_rel 545 #define elf_backend_object_p 0 546 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook 547 #define elf_backend_check_relocs elf32_d10v_check_relocs 548 #define elf_backend_relocate_section elf32_d10v_relocate_section 549 #define elf_backend_can_gc_sections 1 550 551 #include "elf32-target.h" 552
Indexes created Thu Mar 26 00:23:24 UTC 2026