1 /* Xstormy16-specific support for 32-bit ELF. 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010, 2011, 2012 3 Free Software Foundation, Inc. 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/xstormy16.h" 27 #include "libiberty.h" 28 29 /* Handle the R_XSTORMY16_24 reloc, which has an odd bit arrangement. */ 30 31 static bfd_reloc_status_type 32 xstormy16_elf_24_reloc (bfd *abfd, 33 arelent *reloc_entry, 34 asymbol *symbol, 35 void * data, 36 asection *input_section, 37 bfd *output_bfd, 38 char **error_message ATTRIBUTE_UNUSED) 39 { 40 bfd_vma relocation, x; 41 42 if (output_bfd != NULL) 43 { 44 reloc_entry->address += input_section->output_offset; 45 return bfd_reloc_ok; 46 } 47 48 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 49 return bfd_reloc_outofrange; 50 51 if (bfd_is_com_section (symbol->section)) 52 relocation = 0; 53 else 54 relocation = symbol->value; 55 56 relocation += symbol->section->output_section->vma; 57 relocation += symbol->section->output_offset; 58 relocation += reloc_entry->addend; 59 60 x = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 61 x &= 0x0000ff00; 62 x |= relocation & 0xff; 63 x |= (relocation << 8) & 0xffff0000; 64 bfd_put_32 (abfd, x, (bfd_byte *) data + reloc_entry->address); 65 66 if (relocation & ~ (bfd_vma) 0xffffff) 67 return bfd_reloc_overflow; 68 69 return bfd_reloc_ok; 70 } 71 72 static reloc_howto_type xstormy16_elf_howto_table [] = 73 { 74 /* This reloc does nothing. */ 75 HOWTO (R_XSTORMY16_NONE, /* type */ 76 0, /* rightshift */ 77 2, /* size (0 = byte, 1 = short, 2 = long) */ 78 32, /* bitsize */ 79 FALSE, /* pc_relative */ 80 0, /* bitpos */ 81 complain_overflow_bitfield, /* complain_on_overflow */ 82 bfd_elf_generic_reloc, /* special_function */ 83 "R_XSTORMY16_NONE", /* name */ 84 FALSE, /* partial_inplace */ 85 0, /* src_mask */ 86 0, /* dst_mask */ 87 FALSE), /* pcrel_offset */ 88 89 /* A 32 bit absolute relocation. */ 90 HOWTO (R_XSTORMY16_32, /* type */ 91 0, /* rightshift */ 92 2, /* size (0 = byte, 1 = short, 2 = long) */ 93 32, /* bitsize */ 94 FALSE, /* pc_relative */ 95 0, /* bitpos */ 96 complain_overflow_dont, /* complain_on_overflow */ 97 bfd_elf_generic_reloc, /* special_function */ 98 "R_XSTORMY16_32", /* name */ 99 FALSE, /* partial_inplace */ 100 0, /* src_mask */ 101 0xffffffff, /* dst_mask */ 102 FALSE), /* pcrel_offset */ 103 104 /* A 16 bit absolute relocation. */ 105 HOWTO (R_XSTORMY16_16, /* type */ 106 0, /* rightshift */ 107 1, /* size (0 = byte, 1 = short, 2 = long) */ 108 16, /* bitsize */ 109 FALSE, /* pc_relative */ 110 0, /* bitpos */ 111 complain_overflow_bitfield, /* complain_on_overflow */ 112 bfd_elf_generic_reloc, /* special_function */ 113 "R_XSTORMY16_16", /* name */ 114 FALSE, /* partial_inplace */ 115 0, /* src_mask */ 116 0xffff, /* dst_mask */ 117 FALSE), /* pcrel_offset */ 118 119 /* An 8 bit absolute relocation. */ 120 HOWTO (R_XSTORMY16_8, /* type */ 121 0, /* rightshift */ 122 0, /* size (0 = byte, 1 = short, 2 = long) */ 123 8, /* bitsize */ 124 FALSE, /* pc_relative */ 125 0, /* bitpos */ 126 complain_overflow_unsigned, /* complain_on_overflow */ 127 bfd_elf_generic_reloc, /* special_function */ 128 "R_XSTORMY16_8", /* name */ 129 FALSE, /* partial_inplace */ 130 0, /* src_mask */ 131 0xff, /* dst_mask */ 132 FALSE), /* pcrel_offset */ 133 134 /* A 32 bit pc-relative relocation. */ 135 HOWTO (R_XSTORMY16_PC32, /* type */ 136 0, /* rightshift */ 137 2, /* size (0 = byte, 1 = short, 2 = long) */ 138 32, /* bitsize */ 139 TRUE, /* pc_relative */ 140 0, /* bitpos */ 141 complain_overflow_dont, /* complain_on_overflow */ 142 bfd_elf_generic_reloc, /* special_function */ 143 "R_XSTORMY16_PC32", /* name */ 144 FALSE, /* partial_inplace */ 145 0, /* src_mask */ 146 0xffffffff, /* dst_mask */ 147 TRUE), /* pcrel_offset */ 148 149 /* A 16 bit pc-relative relocation. */ 150 HOWTO (R_XSTORMY16_PC16, /* type */ 151 0, /* rightshift */ 152 1, /* size (0 = byte, 1 = short, 2 = long) */ 153 16, /* bitsize */ 154 TRUE, /* pc_relative */ 155 0, /* bitpos */ 156 complain_overflow_signed, /* complain_on_overflow */ 157 bfd_elf_generic_reloc, /* special_function */ 158 "R_XSTORMY16_PC16", /* name */ 159 FALSE, /* partial_inplace */ 160 0, /* src_mask */ 161 0xffffffff, /* dst_mask */ 162 TRUE), /* pcrel_offset */ 163 164 /* An 8 bit pc-relative relocation. */ 165 HOWTO (R_XSTORMY16_PC8, /* type */ 166 0, /* rightshift */ 167 0, /* size (0 = byte, 1 = short, 2 = long) */ 168 8, /* bitsize */ 169 TRUE, /* pc_relative */ 170 0, /* bitpos */ 171 complain_overflow_signed, /* complain_on_overflow */ 172 bfd_elf_generic_reloc, /* special_function */ 173 "R_XSTORMY16_PC8", /* name */ 174 FALSE, /* partial_inplace */ 175 0, /* src_mask */ 176 0xffffffff, /* dst_mask */ 177 TRUE), /* pcrel_offset */ 178 179 /* A 12-bit pc-relative relocation suitable for the branch instructions. */ 180 HOWTO (R_XSTORMY16_REL_12, /* type */ 181 1, /* rightshift */ 182 1, /* size (0 = byte, 1 = short, 2 = long) */ 183 11, /* bitsize */ 184 TRUE, /* pc_relative */ 185 1, /* bitpos */ 186 complain_overflow_signed, /* complain_on_overflow */ 187 bfd_elf_generic_reloc, /* special_function */ 188 "R_XSTORMY16_REL_12", /* name */ 189 FALSE, /* partial_inplace */ 190 0, /* src_mask */ 191 0x0ffe, /* dst_mask */ 192 TRUE), /* pcrel_offset */ 193 194 /* A 24-bit absolute relocation suitable for the jump instructions. */ 195 HOWTO (R_XSTORMY16_24, /* type */ 196 0, /* rightshift */ 197 2, /* size (0 = byte, 1 = short, 2 = long) */ 198 24, /* bitsize */ 199 FALSE, /* pc_relative */ 200 0, /* bitpos */ 201 complain_overflow_unsigned, /* complain_on_overflow */ 202 xstormy16_elf_24_reloc, /* special_function */ 203 "R_XSTORMY16_24", /* name */ 204 TRUE, /* partial_inplace */ 205 0, /* src_mask */ 206 0xffff00ff, /* dst_mask */ 207 TRUE), /* pcrel_offset */ 208 209 /* A 16 bit absolute relocation to a function pointer. */ 210 HOWTO (R_XSTORMY16_FPTR16, /* type */ 211 0, /* rightshift */ 212 1, /* size (0 = byte, 1 = short, 2 = long) */ 213 16, /* bitsize */ 214 FALSE, /* pc_relative */ 215 0, /* bitpos */ 216 complain_overflow_bitfield, /* complain_on_overflow */ 217 bfd_elf_generic_reloc, /* special_function */ 218 "R_XSTORMY16_FPTR16", /* name */ 219 FALSE, /* partial_inplace */ 220 0, /* src_mask */ 221 0xffffffff, /* dst_mask */ 222 FALSE), /* pcrel_offset */ 223 224 /* Low order 16 bit value of a high memory address. */ 225 HOWTO (R_XSTORMY16_LO16, /* type */ 226 0, /* rightshift */ 227 1, /* size (0 = byte, 1 = short, 2 = long) */ 228 16, /* bitsize */ 229 FALSE, /* pc_relative */ 230 0, /* bitpos */ 231 complain_overflow_dont, /* complain_on_overflow */ 232 bfd_elf_generic_reloc, /* special_function */ 233 "R_XSTORMY16_LO16", /* name */ 234 FALSE, /* partial_inplace */ 235 0, /* src_mask */ 236 0xffff, /* dst_mask */ 237 FALSE), /* pcrel_offset */ 238 239 /* High order 16 bit value of a high memory address. */ 240 HOWTO (R_XSTORMY16_HI16, /* type */ 241 16, /* rightshift */ 242 1, /* size (0 = byte, 1 = short, 2 = long) */ 243 16, /* bitsize */ 244 FALSE, /* pc_relative */ 245 0, /* bitpos */ 246 complain_overflow_dont, /* complain_on_overflow */ 247 bfd_elf_generic_reloc, /* special_function */ 248 "R_XSTORMY16_HI16", /* name */ 249 FALSE, /* partial_inplace */ 250 0, /* src_mask */ 251 0xffff, /* dst_mask */ 252 FALSE), /* pcrel_offset */ 253 254 /* A 12 bit absolute relocation. */ 255 HOWTO (R_XSTORMY16_12, /* type */ 256 0, /* rightshift */ 257 1, /* size (0 = byte, 1 = short, 2 = long) */ 258 12, /* bitsize */ 259 FALSE, /* pc_relative */ 260 0, /* bitpos */ 261 complain_overflow_signed, /* complain_on_overflow */ 262 bfd_elf_generic_reloc, /* special_function */ 263 "R_XSTORMY16_12", /* name */ 264 FALSE, /* partial_inplace */ 265 0x0000, /* src_mask */ 266 0x0fff, /* dst_mask */ 267 FALSE), /* pcrel_offset */ 268 }; 269 270 static reloc_howto_type xstormy16_elf_howto_table2 [] = 271 { 272 /* GNU extension to record C++ vtable hierarchy */ 273 HOWTO (R_XSTORMY16_GNU_VTINHERIT, /* type */ 274 0, /* rightshift */ 275 2, /* size (0 = byte, 1 = short, 2 = long) */ 276 0, /* bitsize */ 277 FALSE, /* pc_relative */ 278 0, /* bitpos */ 279 complain_overflow_dont, /* complain_on_overflow */ 280 NULL, /* special_function */ 281 "R_XSTORMY16_GNU_VTINHERIT", /* name */ 282 FALSE, /* partial_inplace */ 283 0, /* src_mask */ 284 0, /* dst_mask */ 285 FALSE), /* pcrel_offset */ 286 287 /* GNU extension to record C++ vtable member usage */ 288 HOWTO (R_XSTORMY16_GNU_VTENTRY, /* type */ 289 0, /* rightshift */ 290 2, /* size (0 = byte, 1 = short, 2 = long) */ 291 0, /* bitsize */ 292 FALSE, /* pc_relative */ 293 0, /* bitpos */ 294 complain_overflow_dont, /* complain_on_overflow */ 295 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 296 "R_XSTORMY16_GNU_VTENTRY", /* name */ 297 FALSE, /* partial_inplace */ 298 0, /* src_mask */ 299 0, /* dst_mask */ 300 FALSE), /* pcrel_offset */ 301 302 }; 303 304 /* Map BFD reloc types to XSTORMY16 ELF reloc types. */ 305 306 typedef struct xstormy16_reloc_map 307 { 308 bfd_reloc_code_real_type bfd_reloc_val; 309 unsigned int xstormy16_reloc_val; 310 reloc_howto_type * table; 311 } reloc_map; 312 313 static const reloc_map xstormy16_reloc_map [] = 314 { 315 { BFD_RELOC_NONE, R_XSTORMY16_NONE, xstormy16_elf_howto_table }, 316 { BFD_RELOC_32, R_XSTORMY16_32, xstormy16_elf_howto_table }, 317 { BFD_RELOC_16, R_XSTORMY16_16, xstormy16_elf_howto_table }, 318 { BFD_RELOC_8, R_XSTORMY16_8, xstormy16_elf_howto_table }, 319 { BFD_RELOC_32_PCREL, R_XSTORMY16_PC32, xstormy16_elf_howto_table }, 320 { BFD_RELOC_16_PCREL, R_XSTORMY16_PC16, xstormy16_elf_howto_table }, 321 { BFD_RELOC_8_PCREL, R_XSTORMY16_PC8, xstormy16_elf_howto_table }, 322 { BFD_RELOC_XSTORMY16_REL_12, R_XSTORMY16_REL_12, xstormy16_elf_howto_table }, 323 { BFD_RELOC_XSTORMY16_24, R_XSTORMY16_24, xstormy16_elf_howto_table }, 324 { BFD_RELOC_XSTORMY16_FPTR16, R_XSTORMY16_FPTR16, xstormy16_elf_howto_table }, 325 { BFD_RELOC_LO16, R_XSTORMY16_LO16, xstormy16_elf_howto_table }, 326 { BFD_RELOC_HI16, R_XSTORMY16_HI16, xstormy16_elf_howto_table }, 327 { BFD_RELOC_XSTORMY16_12, R_XSTORMY16_12, xstormy16_elf_howto_table }, 328 { BFD_RELOC_VTABLE_INHERIT, R_XSTORMY16_GNU_VTINHERIT, xstormy16_elf_howto_table2 }, 329 { BFD_RELOC_VTABLE_ENTRY, R_XSTORMY16_GNU_VTENTRY, xstormy16_elf_howto_table2 }, 330 }; 331 332 static reloc_howto_type * 333 xstormy16_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, 334 bfd_reloc_code_real_type code) 335 { 336 unsigned int i; 337 338 for (i = ARRAY_SIZE (xstormy16_reloc_map); --i;) 339 { 340 const reloc_map * entry; 341 342 entry = xstormy16_reloc_map + i; 343 344 if (entry->bfd_reloc_val == code) 345 return entry->table + (entry->xstormy16_reloc_val 346 - entry->table[0].type); 347 } 348 349 return NULL; 350 } 351 352 static reloc_howto_type * 353 xstormy16_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 354 const char *r_name) 355 { 356 unsigned int i; 357 358 for (i = 0; 359 i < (sizeof (xstormy16_elf_howto_table) 360 / sizeof (xstormy16_elf_howto_table[0])); 361 i++) 362 if (xstormy16_elf_howto_table[i].name != NULL 363 && strcasecmp (xstormy16_elf_howto_table[i].name, r_name) == 0) 364 return &xstormy16_elf_howto_table[i]; 365 366 for (i = 0; 367 i < (sizeof (xstormy16_elf_howto_table2) 368 / sizeof (xstormy16_elf_howto_table2[0])); 369 i++) 370 if (xstormy16_elf_howto_table2[i].name != NULL 371 && strcasecmp (xstormy16_elf_howto_table2[i].name, r_name) == 0) 372 return &xstormy16_elf_howto_table2[i]; 373 374 return NULL; 375 } 376 377 /* Set the howto pointer for an XSTORMY16 ELF reloc. */ 378 379 static void 380 xstormy16_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED, 381 arelent * cache_ptr, 382 Elf_Internal_Rela * dst) 383 { 384 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 385 386 if (r_type <= (unsigned int) R_XSTORMY16_12) 387 cache_ptr->howto = &xstormy16_elf_howto_table [r_type]; 388 else if (r_type - R_XSTORMY16_GNU_VTINHERIT 389 <= (unsigned int) R_XSTORMY16_GNU_VTENTRY) 390 cache_ptr->howto 391 = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT]; 392 else 393 abort (); 394 } 395 396 /* We support 16-bit pointers to code above 64k by generating a thunk 397 below 64k containing a JMPF instruction to the final address. We 398 cannot, unfortunately, minimize the number of thunks unless the 399 -relax switch is given, as otherwise we have no idea where the 400 sections will fall in the address space. */ 401 402 static bfd_boolean 403 xstormy16_elf_check_relocs (bfd *abfd, 404 struct bfd_link_info *info, 405 asection *sec, 406 const Elf_Internal_Rela *relocs) 407 { 408 const Elf_Internal_Rela *rel, *relend; 409 struct elf_link_hash_entry **sym_hashes; 410 Elf_Internal_Shdr *symtab_hdr; 411 bfd_vma *local_plt_offsets; 412 asection *splt; 413 bfd *dynobj; 414 415 if (info->relocatable) 416 return TRUE; 417 418 symtab_hdr = &elf_tdata(abfd)->symtab_hdr; 419 sym_hashes = elf_sym_hashes (abfd); 420 local_plt_offsets = elf_local_got_offsets (abfd); 421 splt = NULL; 422 dynobj = elf_hash_table(info)->dynobj; 423 424 relend = relocs + sec->reloc_count; 425 for (rel = relocs; rel < relend; ++rel) 426 { 427 unsigned long r_symndx; 428 struct elf_link_hash_entry *h; 429 bfd_vma *offset; 430 431 r_symndx = ELF32_R_SYM (rel->r_info); 432 if (r_symndx < symtab_hdr->sh_info) 433 h = NULL; 434 else 435 { 436 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 437 while (h->root.type == bfd_link_hash_indirect 438 || h->root.type == bfd_link_hash_warning) 439 h = (struct elf_link_hash_entry *) h->root.u.i.link; 440 } 441 442 switch (ELF32_R_TYPE (rel->r_info)) 443 { 444 /* This relocation describes a 16-bit pointer to a function. 445 We may need to allocate a thunk in low memory; reserve memory 446 for it now. */ 447 case R_XSTORMY16_FPTR16: 448 if (rel->r_addend != 0) 449 { 450 (*info->callbacks->warning) 451 (info, _("non-zero addend in @fptr reloc"), 0, 452 abfd, 0, 0); 453 } 454 455 if (dynobj == NULL) 456 elf_hash_table (info)->dynobj = dynobj = abfd; 457 if (splt == NULL) 458 { 459 splt = bfd_get_linker_section (dynobj, ".plt"); 460 if (splt == NULL) 461 { 462 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS 463 | SEC_IN_MEMORY | SEC_LINKER_CREATED 464 | SEC_READONLY | SEC_CODE); 465 466 splt = bfd_make_section_anyway_with_flags (dynobj, ".plt", 467 flags); 468 if (splt == NULL 469 || ! bfd_set_section_alignment (dynobj, splt, 1)) 470 return FALSE; 471 } 472 } 473 474 if (h != NULL) 475 offset = &h->plt.offset; 476 else 477 { 478 if (local_plt_offsets == NULL) 479 { 480 size_t size; 481 unsigned int i; 482 483 size = symtab_hdr->sh_info * sizeof (bfd_vma); 484 local_plt_offsets = bfd_alloc (abfd, size); 485 if (local_plt_offsets == NULL) 486 return FALSE; 487 elf_local_got_offsets (abfd) = local_plt_offsets; 488 489 for (i = 0; i < symtab_hdr->sh_info; i++) 490 local_plt_offsets[i] = (bfd_vma) -1; 491 } 492 offset = &local_plt_offsets[r_symndx]; 493 } 494 495 if (*offset == (bfd_vma) -1) 496 { 497 *offset = splt->size; 498 splt->size += 4; 499 } 500 break; 501 502 /* This relocation describes the C++ object vtable hierarchy. 503 Reconstruct it for later use during GC. */ 504 case R_XSTORMY16_GNU_VTINHERIT: 505 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 506 return FALSE; 507 break; 508 509 /* This relocation describes which C++ vtable entries are actually 510 used. Record for later use during GC. */ 511 case R_XSTORMY16_GNU_VTENTRY: 512 BFD_ASSERT (h != NULL); 513 if (h != NULL 514 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 515 return FALSE; 516 break; 517 } 518 } 519 520 return TRUE; 521 } 522 523 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H 524 is within the low 64k, remove any entry for it in the plt. */ 525 526 struct relax_plt_data 527 { 528 asection *splt; 529 bfd_boolean *again; 530 }; 531 532 static bfd_boolean 533 xstormy16_relax_plt_check (struct elf_link_hash_entry *h, void * xdata) 534 { 535 struct relax_plt_data *data = (struct relax_plt_data *) xdata; 536 537 if (h->plt.offset != (bfd_vma) -1) 538 { 539 bfd_vma address; 540 541 if (h->root.type == bfd_link_hash_undefined 542 || h->root.type == bfd_link_hash_undefweak) 543 address = 0; 544 else 545 address = (h->root.u.def.section->output_section->vma 546 + h->root.u.def.section->output_offset 547 + h->root.u.def.value); 548 549 if (address <= 0xffff) 550 { 551 h->plt.offset = -1; 552 data->splt->size -= 4; 553 *data->again = TRUE; 554 } 555 } 556 557 return TRUE; 558 } 559 560 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H 561 previously had a plt entry, give it a new entry offset. */ 562 563 static bfd_boolean 564 xstormy16_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata) 565 { 566 bfd_vma *entry = (bfd_vma *) xdata; 567 568 if (h->plt.offset != (bfd_vma) -1) 569 { 570 h->plt.offset = *entry; 571 *entry += 4; 572 } 573 574 return TRUE; 575 } 576 577 static bfd_boolean 578 xstormy16_elf_relax_section (bfd *dynobj, 579 asection *splt, 580 struct bfd_link_info *info, 581 bfd_boolean *again) 582 { 583 struct relax_plt_data relax_plt_data; 584 bfd *ibfd; 585 586 /* Assume nothing changes. */ 587 *again = FALSE; 588 589 if (info->relocatable) 590 return TRUE; 591 592 /* We only relax the .plt section at the moment. */ 593 if (dynobj != elf_hash_table (info)->dynobj 594 || strcmp (splt->name, ".plt") != 0) 595 return TRUE; 596 597 /* Quick check for an empty plt. */ 598 if (splt->size == 0) 599 return TRUE; 600 601 /* Map across all global symbols; see which ones happen to 602 fall in the low 64k. */ 603 relax_plt_data.splt = splt; 604 relax_plt_data.again = again; 605 elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check, 606 &relax_plt_data); 607 608 /* Likewise for local symbols, though that's somewhat less convenient 609 as we have to walk the list of input bfds and swap in symbol data. */ 610 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next) 611 { 612 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd); 613 Elf_Internal_Shdr *symtab_hdr; 614 Elf_Internal_Sym *isymbuf = NULL; 615 unsigned int idx; 616 617 if (! local_plt_offsets) 618 continue; 619 620 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 621 if (symtab_hdr->sh_info != 0) 622 { 623 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 624 if (isymbuf == NULL) 625 isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr, 626 symtab_hdr->sh_info, 0, 627 NULL, NULL, NULL); 628 if (isymbuf == NULL) 629 return FALSE; 630 } 631 632 for (idx = 0; idx < symtab_hdr->sh_info; ++idx) 633 { 634 Elf_Internal_Sym *isym; 635 asection *tsec; 636 bfd_vma address; 637 638 if (local_plt_offsets[idx] == (bfd_vma) -1) 639 continue; 640 641 isym = &isymbuf[idx]; 642 if (isym->st_shndx == SHN_UNDEF) 643 continue; 644 else if (isym->st_shndx == SHN_ABS) 645 tsec = bfd_abs_section_ptr; 646 else if (isym->st_shndx == SHN_COMMON) 647 tsec = bfd_com_section_ptr; 648 else 649 tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx); 650 651 address = (tsec->output_section->vma 652 + tsec->output_offset 653 + isym->st_value); 654 if (address <= 0xffff) 655 { 656 local_plt_offsets[idx] = -1; 657 splt->size -= 4; 658 *again = TRUE; 659 } 660 } 661 662 if (isymbuf != NULL 663 && symtab_hdr->contents != (unsigned char *) isymbuf) 664 { 665 if (! info->keep_memory) 666 free (isymbuf); 667 else 668 { 669 /* Cache the symbols for elf_link_input_bfd. */ 670 symtab_hdr->contents = (unsigned char *) isymbuf; 671 } 672 } 673 } 674 675 /* If we changed anything, walk the symbols again to reallocate 676 .plt entry addresses. */ 677 if (*again && splt->size > 0) 678 { 679 bfd_vma entry = 0; 680 681 elf_link_hash_traverse (elf_hash_table (info), 682 xstormy16_relax_plt_realloc, &entry); 683 684 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next) 685 { 686 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd); 687 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info; 688 unsigned int idx; 689 690 if (! local_plt_offsets) 691 continue; 692 693 for (idx = 0; idx < nlocals; ++idx) 694 if (local_plt_offsets[idx] != (bfd_vma) -1) 695 { 696 local_plt_offsets[idx] = entry; 697 entry += 4; 698 } 699 } 700 } 701 702 return TRUE; 703 } 704 705 static bfd_boolean 706 xstormy16_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 707 struct bfd_link_info *info) 708 { 709 bfd *dynobj; 710 asection *splt; 711 712 if (info->relocatable) 713 return TRUE; 714 715 dynobj = elf_hash_table (info)->dynobj; 716 if (dynobj == NULL) 717 return TRUE; 718 719 splt = bfd_get_linker_section (dynobj, ".plt"); 720 BFD_ASSERT (splt != NULL); 721 722 splt->contents = bfd_zalloc (dynobj, splt->size); 723 if (splt->contents == NULL) 724 return FALSE; 725 726 return TRUE; 727 } 728 729 /* Relocate an XSTORMY16 ELF section. 730 731 The RELOCATE_SECTION function is called by the new ELF backend linker 732 to handle the relocations for a section. 733 734 The relocs are always passed as Rela structures; if the section 735 actually uses Rel structures, the r_addend field will always be 736 zero. 737 738 This function is responsible for adjusting the section contents as 739 necessary, and (if using Rela relocs and generating a relocatable 740 output file) adjusting the reloc addend as necessary. 741 742 This function does not have to worry about setting the reloc 743 address or the reloc symbol index. 744 745 LOCAL_SYMS is a pointer to the swapped in local symbols. 746 747 LOCAL_SECTIONS is an array giving the section in the input file 748 corresponding to the st_shndx field of each local symbol. 749 750 The global hash table entry for the global symbols can be found 751 via elf_sym_hashes (input_bfd). 752 753 When generating relocatable output, this function must handle 754 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 755 going to be the section symbol corresponding to the output 756 section, which means that the addend must be adjusted 757 accordingly. */ 758 759 static bfd_boolean 760 xstormy16_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED, 761 struct bfd_link_info * info, 762 bfd * input_bfd, 763 asection * input_section, 764 bfd_byte * contents, 765 Elf_Internal_Rela * relocs, 766 Elf_Internal_Sym * local_syms, 767 asection ** local_sections) 768 { 769 Elf_Internal_Shdr * symtab_hdr; 770 struct elf_link_hash_entry ** sym_hashes; 771 Elf_Internal_Rela * rel; 772 Elf_Internal_Rela * relend; 773 bfd *dynobj; 774 asection *splt; 775 776 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 777 sym_hashes = elf_sym_hashes (input_bfd); 778 relend = relocs + input_section->reloc_count; 779 780 dynobj = elf_hash_table (info)->dynobj; 781 splt = NULL; 782 if (dynobj != NULL) 783 splt = bfd_get_linker_section (dynobj, ".plt"); 784 785 for (rel = relocs; rel < relend; rel ++) 786 { 787 reloc_howto_type * howto; 788 unsigned long r_symndx; 789 Elf_Internal_Sym * sym; 790 asection * sec; 791 struct elf_link_hash_entry * h; 792 bfd_vma relocation; 793 bfd_reloc_status_type r; 794 const char * name = NULL; 795 int r_type; 796 797 r_type = ELF32_R_TYPE (rel->r_info); 798 799 if ( r_type == R_XSTORMY16_GNU_VTINHERIT 800 || r_type == R_XSTORMY16_GNU_VTENTRY) 801 continue; 802 803 r_symndx = ELF32_R_SYM (rel->r_info); 804 howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info); 805 h = NULL; 806 sym = NULL; 807 sec = NULL; 808 809 if (r_symndx < symtab_hdr->sh_info) 810 { 811 sym = local_syms + r_symndx; 812 sec = local_sections [r_symndx]; 813 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 814 } 815 else 816 { 817 bfd_boolean unresolved_reloc, warned; 818 819 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 820 r_symndx, symtab_hdr, sym_hashes, 821 h, sec, relocation, 822 unresolved_reloc, warned); 823 } 824 825 if (sec != NULL && discarded_section (sec)) 826 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 827 rel, 1, relend, howto, 0, contents); 828 829 if (info->relocatable) 830 continue; 831 832 if (h != NULL) 833 name = h->root.root.string; 834 else 835 { 836 name = (bfd_elf_string_from_elf_section 837 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 838 if (name == NULL || *name == '\0') 839 name = bfd_section_name (input_bfd, sec); 840 } 841 842 switch (ELF32_R_TYPE (rel->r_info)) 843 { 844 case R_XSTORMY16_24: 845 { 846 bfd_vma reloc = relocation + rel->r_addend; 847 unsigned int x; 848 849 x = bfd_get_32 (input_bfd, contents + rel->r_offset); 850 x &= 0x0000ff00; 851 x |= reloc & 0xff; 852 x |= (reloc << 8) & 0xffff0000; 853 bfd_put_32 (input_bfd, x, contents + rel->r_offset); 854 855 if (reloc & ~0xffffff) 856 r = bfd_reloc_overflow; 857 else 858 r = bfd_reloc_ok; 859 break; 860 } 861 862 case R_XSTORMY16_FPTR16: 863 { 864 bfd_vma *plt_offset; 865 866 if (h != NULL) 867 plt_offset = &h->plt.offset; 868 else 869 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx; 870 871 if (relocation <= 0xffff) 872 { 873 /* If the symbol is in range for a 16-bit address, we should 874 have deallocated the plt entry in relax_section. */ 875 BFD_ASSERT (*plt_offset == (bfd_vma) -1); 876 } 877 else 878 { 879 /* If the symbol is out of range for a 16-bit address, 880 we must have allocated a plt entry. */ 881 BFD_ASSERT (*plt_offset != (bfd_vma) -1); 882 883 /* If this is the first time we've processed this symbol, 884 fill in the plt entry with the correct symbol address. */ 885 if ((*plt_offset & 1) == 0) 886 { 887 unsigned int x; 888 889 x = 0x00000200; /* jmpf */ 890 x |= relocation & 0xff; 891 x |= (relocation << 8) & 0xffff0000; 892 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset); 893 *plt_offset |= 1; 894 } 895 896 relocation = (splt->output_section->vma 897 + splt->output_offset 898 + (*plt_offset & -2)); 899 } 900 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 901 contents, rel->r_offset, 902 relocation, 0); 903 break; 904 } 905 906 default: 907 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 908 contents, rel->r_offset, 909 relocation, rel->r_addend); 910 break; 911 } 912 913 if (r != bfd_reloc_ok) 914 { 915 const char * msg = NULL; 916 917 switch (r) 918 { 919 case bfd_reloc_overflow: 920 r = info->callbacks->reloc_overflow 921 (info, (h ? &h->root : NULL), name, howto->name, 922 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 923 break; 924 925 case bfd_reloc_undefined: 926 r = info->callbacks->undefined_symbol 927 (info, name, input_bfd, input_section, rel->r_offset, 928 TRUE); 929 break; 930 931 case bfd_reloc_outofrange: 932 msg = _("internal error: out of range error"); 933 break; 934 935 case bfd_reloc_notsupported: 936 msg = _("internal error: unsupported relocation error"); 937 break; 938 939 case bfd_reloc_dangerous: 940 msg = _("internal error: dangerous relocation"); 941 break; 942 943 default: 944 msg = _("internal error: unknown error"); 945 break; 946 } 947 948 if (msg) 949 r = info->callbacks->warning 950 (info, msg, name, input_bfd, input_section, rel->r_offset); 951 952 if (! r) 953 return FALSE; 954 } 955 } 956 957 return TRUE; 958 } 959 960 /* This must exist if dynobj is ever set. */ 961 962 static bfd_boolean 963 xstormy16_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED, 964 struct bfd_link_info *info) 965 { 966 bfd *dynobj; 967 asection *splt; 968 969 /* As an extra sanity check, verify that all plt entries have 970 been filled in. */ 971 972 if ((dynobj = elf_hash_table (info)->dynobj) != NULL 973 && (splt = bfd_get_linker_section (dynobj, ".plt")) != NULL) 974 { 975 bfd_byte *contents = splt->contents; 976 unsigned int i, size = splt->size; 977 978 for (i = 0; i < size; i += 4) 979 { 980 unsigned int x = bfd_get_32 (dynobj, contents + i); 981 982 BFD_ASSERT (x != 0); 983 } 984 } 985 986 return TRUE; 987 } 988 989 /* Return the section that should be marked against GC for a given 990 relocation. */ 991 992 static asection * 993 xstormy16_elf_gc_mark_hook (asection *sec, 994 struct bfd_link_info *info, 995 Elf_Internal_Rela *rel, 996 struct elf_link_hash_entry *h, 997 Elf_Internal_Sym *sym) 998 { 999 if (h != NULL) 1000 switch (ELF32_R_TYPE (rel->r_info)) 1001 { 1002 case R_XSTORMY16_GNU_VTINHERIT: 1003 case R_XSTORMY16_GNU_VTENTRY: 1004 return NULL; 1005 } 1006 1007 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1008 } 1009 1010 #define ELF_ARCH bfd_arch_xstormy16 1011 #define ELF_MACHINE_CODE EM_XSTORMY16 1012 #define ELF_MAXPAGESIZE 0x100 1013 1014 #define TARGET_LITTLE_SYM bfd_elf32_xstormy16_vec 1015 #define TARGET_LITTLE_NAME "elf32-xstormy16" 1016 1017 #define elf_info_to_howto_rel NULL 1018 #define elf_info_to_howto xstormy16_info_to_howto_rela 1019 #define elf_backend_relocate_section xstormy16_elf_relocate_section 1020 #define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook 1021 #define elf_backend_check_relocs xstormy16_elf_check_relocs 1022 #define elf_backend_always_size_sections \ 1023 xstormy16_elf_always_size_sections 1024 #define elf_backend_omit_section_dynsym \ 1025 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 1026 #define elf_backend_finish_dynamic_sections \ 1027 xstormy16_elf_finish_dynamic_sections 1028 1029 #define elf_backend_can_gc_sections 1 1030 #define elf_backend_rela_normal 1 1031 1032 #define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup 1033 #define bfd_elf32_bfd_reloc_name_lookup \ 1034 xstormy16_reloc_name_lookup 1035 #define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section 1036 1037 #include "elf32-target.h" 1038