1/* Xstormy16-specific support for 32-bit ELF. 2 Copyright (C) 2000-2017 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21#include "sysdep.h" 22#include "bfd.h" 23#include "libbfd.h" 24#include "elf-bfd.h" 25#include "elf/xstormy16.h" 26#include "libiberty.h" 27 28/* Handle the R_XSTORMY16_24 reloc, which has an odd bit arrangement. */ 29 30static bfd_reloc_status_type 31xstormy16_elf_24_reloc (bfd *abfd, 32 arelent *reloc_entry, 33 asymbol *symbol, 34 void * data, 35 asection *input_section, 36 bfd *output_bfd, 37 char **error_message ATTRIBUTE_UNUSED) 38{ 39 bfd_vma relocation, x; 40 41 if (output_bfd != NULL) 42 { 43 reloc_entry->address += input_section->output_offset; 44 return bfd_reloc_ok; 45 } 46 47 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 48 return bfd_reloc_outofrange; 49 50 if (bfd_is_com_section (symbol->section)) 51 relocation = 0; 52 else 53 relocation = symbol->value; 54 55 relocation += symbol->section->output_section->vma; 56 relocation += symbol->section->output_offset; 57 relocation += reloc_entry->addend; 58 59 x = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); 60 x &= 0x0000ff00; 61 x |= relocation & 0xff; 62 x |= (relocation << 8) & 0xffff0000; 63 bfd_put_32 (abfd, x, (bfd_byte *) data + reloc_entry->address); 64 65 if (relocation & ~ (bfd_vma) 0xffffff) 66 return bfd_reloc_overflow; 67 68 return bfd_reloc_ok; 69} 70 71static reloc_howto_type xstormy16_elf_howto_table [] = 72{ 73 /* This reloc does nothing. */ 74 HOWTO (R_XSTORMY16_NONE, /* type */ 75 0, /* rightshift */ 76 3, /* size (0 = byte, 1 = short, 2 = long) */ 77 0, /* bitsize */ 78 FALSE, /* pc_relative */ 79 0, /* bitpos */ 80 complain_overflow_dont, /* complain_on_overflow */ 81 bfd_elf_generic_reloc, /* special_function */ 82 "R_XSTORMY16_NONE", /* name */ 83 FALSE, /* partial_inplace */ 84 0, /* src_mask */ 85 0, /* dst_mask */ 86 FALSE), /* pcrel_offset */ 87 88 /* A 32 bit absolute relocation. */ 89 HOWTO (R_XSTORMY16_32, /* type */ 90 0, /* rightshift */ 91 2, /* size (0 = byte, 1 = short, 2 = long) */ 92 32, /* bitsize */ 93 FALSE, /* pc_relative */ 94 0, /* bitpos */ 95 complain_overflow_dont, /* complain_on_overflow */ 96 bfd_elf_generic_reloc, /* special_function */ 97 "R_XSTORMY16_32", /* name */ 98 FALSE, /* partial_inplace */ 99 0, /* src_mask */ 100 0xffffffff, /* dst_mask */ 101 FALSE), /* pcrel_offset */ 102 103 /* A 16 bit absolute relocation. */ 104 HOWTO (R_XSTORMY16_16, /* type */ 105 0, /* rightshift */ 106 1, /* size (0 = byte, 1 = short, 2 = long) */ 107 16, /* bitsize */ 108 FALSE, /* pc_relative */ 109 0, /* bitpos */ 110 complain_overflow_bitfield, /* complain_on_overflow */ 111 bfd_elf_generic_reloc, /* special_function */ 112 "R_XSTORMY16_16", /* name */ 113 FALSE, /* partial_inplace */ 114 0, /* src_mask */ 115 0xffff, /* dst_mask */ 116 FALSE), /* pcrel_offset */ 117 118 /* An 8 bit absolute relocation. */ 119 HOWTO (R_XSTORMY16_8, /* type */ 120 0, /* rightshift */ 121 0, /* size (0 = byte, 1 = short, 2 = long) */ 122 8, /* bitsize */ 123 FALSE, /* pc_relative */ 124 0, /* bitpos */ 125 complain_overflow_unsigned, /* complain_on_overflow */ 126 bfd_elf_generic_reloc, /* special_function */ 127 "R_XSTORMY16_8", /* name */ 128 FALSE, /* partial_inplace */ 129 0, /* src_mask */ 130 0xff, /* dst_mask */ 131 FALSE), /* pcrel_offset */ 132 133 /* A 32 bit pc-relative relocation. */ 134 HOWTO (R_XSTORMY16_PC32, /* type */ 135 0, /* rightshift */ 136 2, /* size (0 = byte, 1 = short, 2 = long) */ 137 32, /* bitsize */ 138 TRUE, /* pc_relative */ 139 0, /* bitpos */ 140 complain_overflow_dont, /* complain_on_overflow */ 141 bfd_elf_generic_reloc, /* special_function */ 142 "R_XSTORMY16_PC32", /* name */ 143 FALSE, /* partial_inplace */ 144 0, /* src_mask */ 145 0xffffffff, /* dst_mask */ 146 TRUE), /* pcrel_offset */ 147 148 /* A 16 bit pc-relative relocation. */ 149 HOWTO (R_XSTORMY16_PC16, /* type */ 150 0, /* rightshift */ 151 1, /* size (0 = byte, 1 = short, 2 = long) */ 152 16, /* bitsize */ 153 TRUE, /* pc_relative */ 154 0, /* bitpos */ 155 complain_overflow_signed, /* complain_on_overflow */ 156 bfd_elf_generic_reloc, /* special_function */ 157 "R_XSTORMY16_PC16", /* name */ 158 FALSE, /* partial_inplace */ 159 0, /* src_mask */ 160 0xffffffff, /* dst_mask */ 161 TRUE), /* pcrel_offset */ 162 163 /* An 8 bit pc-relative relocation. */ 164 HOWTO (R_XSTORMY16_PC8, /* type */ 165 0, /* rightshift */ 166 0, /* size (0 = byte, 1 = short, 2 = long) */ 167 8, /* bitsize */ 168 TRUE, /* pc_relative */ 169 0, /* bitpos */ 170 complain_overflow_signed, /* complain_on_overflow */ 171 bfd_elf_generic_reloc, /* special_function */ 172 "R_XSTORMY16_PC8", /* name */ 173 FALSE, /* partial_inplace */ 174 0, /* src_mask */ 175 0xffffffff, /* dst_mask */ 176 TRUE), /* pcrel_offset */ 177 178 /* A 12-bit pc-relative relocation suitable for the branch instructions. */ 179 HOWTO (R_XSTORMY16_REL_12, /* type */ 180 1, /* rightshift */ 181 1, /* size (0 = byte, 1 = short, 2 = long) */ 182 11, /* bitsize */ 183 TRUE, /* pc_relative */ 184 1, /* bitpos */ 185 complain_overflow_signed, /* complain_on_overflow */ 186 bfd_elf_generic_reloc, /* special_function */ 187 "R_XSTORMY16_REL_12", /* name */ 188 FALSE, /* partial_inplace */ 189 0, /* src_mask */ 190 0x0ffe, /* dst_mask */ 191 TRUE), /* pcrel_offset */ 192 193 /* A 24-bit absolute relocation suitable for the jump instructions. */ 194 HOWTO (R_XSTORMY16_24, /* type */ 195 0, /* rightshift */ 196 2, /* size (0 = byte, 1 = short, 2 = long) */ 197 24, /* bitsize */ 198 FALSE, /* pc_relative */ 199 0, /* bitpos */ 200 complain_overflow_unsigned, /* complain_on_overflow */ 201 xstormy16_elf_24_reloc, /* special_function */ 202 "R_XSTORMY16_24", /* name */ 203 TRUE, /* partial_inplace */ 204 0, /* src_mask */ 205 0xffff00ff, /* dst_mask */ 206 TRUE), /* pcrel_offset */ 207 208 /* A 16 bit absolute relocation to a function pointer. */ 209 HOWTO (R_XSTORMY16_FPTR16, /* type */ 210 0, /* rightshift */ 211 1, /* size (0 = byte, 1 = short, 2 = long) */ 212 16, /* bitsize */ 213 FALSE, /* pc_relative */ 214 0, /* bitpos */ 215 complain_overflow_bitfield, /* complain_on_overflow */ 216 bfd_elf_generic_reloc, /* special_function */ 217 "R_XSTORMY16_FPTR16", /* name */ 218 FALSE, /* partial_inplace */ 219 0, /* src_mask */ 220 0xffffffff, /* dst_mask */ 221 FALSE), /* pcrel_offset */ 222 223 /* Low order 16 bit value of a high memory address. */ 224 HOWTO (R_XSTORMY16_LO16, /* type */ 225 0, /* rightshift */ 226 1, /* size (0 = byte, 1 = short, 2 = long) */ 227 16, /* bitsize */ 228 FALSE, /* pc_relative */ 229 0, /* bitpos */ 230 complain_overflow_dont, /* complain_on_overflow */ 231 bfd_elf_generic_reloc, /* special_function */ 232 "R_XSTORMY16_LO16", /* name */ 233 FALSE, /* partial_inplace */ 234 0, /* src_mask */ 235 0xffff, /* dst_mask */ 236 FALSE), /* pcrel_offset */ 237 238 /* High order 16 bit value of a high memory address. */ 239 HOWTO (R_XSTORMY16_HI16, /* type */ 240 16, /* rightshift */ 241 1, /* size (0 = byte, 1 = short, 2 = long) */ 242 16, /* bitsize */ 243 FALSE, /* pc_relative */ 244 0, /* bitpos */ 245 complain_overflow_dont, /* complain_on_overflow */ 246 bfd_elf_generic_reloc, /* special_function */ 247 "R_XSTORMY16_HI16", /* name */ 248 FALSE, /* partial_inplace */ 249 0, /* src_mask */ 250 0xffff, /* dst_mask */ 251 FALSE), /* pcrel_offset */ 252 253 /* A 12 bit absolute relocation. */ 254 HOWTO (R_XSTORMY16_12, /* type */ 255 0, /* rightshift */ 256 1, /* size (0 = byte, 1 = short, 2 = long) */ 257 12, /* bitsize */ 258 FALSE, /* pc_relative */ 259 0, /* bitpos */ 260 complain_overflow_signed, /* complain_on_overflow */ 261 bfd_elf_generic_reloc, /* special_function */ 262 "R_XSTORMY16_12", /* name */ 263 FALSE, /* partial_inplace */ 264 0x0000, /* src_mask */ 265 0x0fff, /* dst_mask */ 266 FALSE), /* pcrel_offset */ 267}; 268 269static reloc_howto_type xstormy16_elf_howto_table2 [] = 270{ 271 /* GNU extension to record C++ vtable hierarchy */ 272 HOWTO (R_XSTORMY16_GNU_VTINHERIT, /* type */ 273 0, /* rightshift */ 274 2, /* size (0 = byte, 1 = short, 2 = long) */ 275 0, /* bitsize */ 276 FALSE, /* pc_relative */ 277 0, /* bitpos */ 278 complain_overflow_dont, /* complain_on_overflow */ 279 NULL, /* special_function */ 280 "R_XSTORMY16_GNU_VTINHERIT", /* name */ 281 FALSE, /* partial_inplace */ 282 0, /* src_mask */ 283 0, /* dst_mask */ 284 FALSE), /* pcrel_offset */ 285 286 /* GNU extension to record C++ vtable member usage */ 287 HOWTO (R_XSTORMY16_GNU_VTENTRY, /* type */ 288 0, /* rightshift */ 289 2, /* size (0 = byte, 1 = short, 2 = long) */ 290 0, /* bitsize */ 291 FALSE, /* pc_relative */ 292 0, /* bitpos */ 293 complain_overflow_dont, /* complain_on_overflow */ 294 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 295 "R_XSTORMY16_GNU_VTENTRY", /* name */ 296 FALSE, /* partial_inplace */ 297 0, /* src_mask */ 298 0, /* dst_mask */ 299 FALSE), /* pcrel_offset */ 300 301}; 302 303/* Map BFD reloc types to XSTORMY16 ELF reloc types. */ 304 305typedef struct xstormy16_reloc_map 306{ 307 bfd_reloc_code_real_type bfd_reloc_val; 308 unsigned int xstormy16_reloc_val; 309 reloc_howto_type * table; 310} reloc_map; 311 312static const reloc_map xstormy16_reloc_map [] = 313{ 314 { BFD_RELOC_NONE, R_XSTORMY16_NONE, xstormy16_elf_howto_table }, 315 { BFD_RELOC_32, R_XSTORMY16_32, xstormy16_elf_howto_table }, 316 { BFD_RELOC_16, R_XSTORMY16_16, xstormy16_elf_howto_table }, 317 { BFD_RELOC_8, R_XSTORMY16_8, xstormy16_elf_howto_table }, 318 { BFD_RELOC_32_PCREL, R_XSTORMY16_PC32, xstormy16_elf_howto_table }, 319 { BFD_RELOC_16_PCREL, R_XSTORMY16_PC16, xstormy16_elf_howto_table }, 320 { BFD_RELOC_8_PCREL, R_XSTORMY16_PC8, xstormy16_elf_howto_table }, 321 { BFD_RELOC_XSTORMY16_REL_12, R_XSTORMY16_REL_12, xstormy16_elf_howto_table }, 322 { BFD_RELOC_XSTORMY16_24, R_XSTORMY16_24, xstormy16_elf_howto_table }, 323 { BFD_RELOC_XSTORMY16_FPTR16, R_XSTORMY16_FPTR16, xstormy16_elf_howto_table }, 324 { BFD_RELOC_LO16, R_XSTORMY16_LO16, xstormy16_elf_howto_table }, 325 { BFD_RELOC_HI16, R_XSTORMY16_HI16, xstormy16_elf_howto_table }, 326 { BFD_RELOC_XSTORMY16_12, R_XSTORMY16_12, xstormy16_elf_howto_table }, 327 { BFD_RELOC_VTABLE_INHERIT, R_XSTORMY16_GNU_VTINHERIT, xstormy16_elf_howto_table2 }, 328 { BFD_RELOC_VTABLE_ENTRY, R_XSTORMY16_GNU_VTENTRY, xstormy16_elf_howto_table2 }, 329}; 330 331static reloc_howto_type * 332xstormy16_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, 333 bfd_reloc_code_real_type code) 334{ 335 unsigned int i; 336 337 for (i = ARRAY_SIZE (xstormy16_reloc_map); i--;) 338 { 339 const reloc_map * entry; 340 341 entry = xstormy16_reloc_map + i; 342 343 if (entry->bfd_reloc_val == code) 344 return entry->table + (entry->xstormy16_reloc_val 345 - entry->table[0].type); 346 } 347 348 return NULL; 349} 350 351static reloc_howto_type * 352xstormy16_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 353 const char *r_name) 354{ 355 unsigned int i; 356 357 for (i = 0; 358 i < (sizeof (xstormy16_elf_howto_table) 359 / sizeof (xstormy16_elf_howto_table[0])); 360 i++) 361 if (xstormy16_elf_howto_table[i].name != NULL 362 && strcasecmp (xstormy16_elf_howto_table[i].name, r_name) == 0) 363 return &xstormy16_elf_howto_table[i]; 364 365 for (i = 0; 366 i < (sizeof (xstormy16_elf_howto_table2) 367 / sizeof (xstormy16_elf_howto_table2[0])); 368 i++) 369 if (xstormy16_elf_howto_table2[i].name != NULL 370 && strcasecmp (xstormy16_elf_howto_table2[i].name, r_name) == 0) 371 return &xstormy16_elf_howto_table2[i]; 372 373 return NULL; 374} 375 376/* Set the howto pointer for an XSTORMY16 ELF reloc. */ 377 378static void 379xstormy16_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED, 380 arelent * cache_ptr, 381 Elf_Internal_Rela * dst) 382{ 383 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 384 385 if (r_type <= (unsigned int) R_XSTORMY16_12) 386 cache_ptr->howto = &xstormy16_elf_howto_table [r_type]; 387 else if (r_type - R_XSTORMY16_GNU_VTINHERIT 388 <= (unsigned int) R_XSTORMY16_GNU_VTENTRY) 389 cache_ptr->howto 390 = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT]; 391 else 392 abort (); 393} 394 395/* We support 16-bit pointers to code above 64k by generating a thunk 396 below 64k containing a JMPF instruction to the final address. We 397 cannot, unfortunately, minimize the number of thunks unless the 398 -relax switch is given, as otherwise we have no idea where the 399 sections will fall in the address space. */ 400 401static bfd_boolean 402xstormy16_elf_check_relocs (bfd *abfd, 403 struct bfd_link_info *info, 404 asection *sec, 405 const Elf_Internal_Rela *relocs) 406{ 407 const Elf_Internal_Rela *rel, *relend; 408 struct elf_link_hash_entry **sym_hashes; 409 Elf_Internal_Shdr *symtab_hdr; 410 bfd_vma *local_plt_offsets; 411 asection *splt; 412 bfd *dynobj; 413 414 if (bfd_link_relocatable (info)) 415 return TRUE; 416 417 symtab_hdr = &elf_tdata(abfd)->symtab_hdr; 418 sym_hashes = elf_sym_hashes (abfd); 419 local_plt_offsets = elf_local_got_offsets (abfd); 420 dynobj = elf_hash_table(info)->dynobj; 421 422 relend = relocs + sec->reloc_count; 423 for (rel = relocs; rel < relend; ++rel) 424 { 425 unsigned long r_symndx; 426 struct elf_link_hash_entry *h; 427 bfd_vma *offset; 428 429 r_symndx = ELF32_R_SYM (rel->r_info); 430 if (r_symndx < symtab_hdr->sh_info) 431 h = NULL; 432 else 433 { 434 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 435 while (h->root.type == bfd_link_hash_indirect 436 || h->root.type == bfd_link_hash_warning) 437 h = (struct elf_link_hash_entry *) h->root.u.i.link; 438 439 /* PR15323, ref flags aren't set for references in the same 440 object. */ 441 h->root.non_ir_ref = 1; 442 } 443 444 switch (ELF32_R_TYPE (rel->r_info)) 445 { 446 /* This relocation describes a 16-bit pointer to a function. 447 We may need to allocate a thunk in low memory; reserve memory 448 for it now. */ 449 case R_XSTORMY16_FPTR16: 450 if (rel->r_addend != 0) 451 { 452 (*info->callbacks->warning) 453 (info, _("non-zero addend in @fptr reloc"), 0, 454 abfd, 0, 0); 455 } 456 457 if (dynobj == NULL) 458 elf_hash_table (info)->dynobj = dynobj = abfd; 459 splt = elf_hash_table (info)->splt; 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 elf_hash_table (info)->splt = splt; 469 if (splt == NULL 470 || ! bfd_set_section_alignment (dynobj, splt, 1)) 471 return FALSE; 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 526struct relax_plt_data 527{ 528 asection *splt; 529 bfd_boolean *again; 530}; 531 532static bfd_boolean 533xstormy16_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 563static bfd_boolean 564xstormy16_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 577static bfd_boolean 578xstormy16_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 (bfd_link_relocatable (info)) 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 705static bfd_boolean 706xstormy16_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 (bfd_link_relocatable (info)) 713 return TRUE; 714 715 dynobj = elf_hash_table (info)->dynobj; 716 if (dynobj == NULL) 717 return TRUE; 718 719 splt = elf_hash_table (info)->splt; 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 759static bfd_boolean 760xstormy16_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 asection *splt; 774 775 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 776 sym_hashes = elf_sym_hashes (input_bfd); 777 relend = relocs + input_section->reloc_count; 778 779 splt = elf_hash_table (info)->splt; 780 781 for (rel = relocs; rel < relend; rel ++) 782 { 783 reloc_howto_type * howto; 784 unsigned long r_symndx; 785 Elf_Internal_Sym * sym; 786 asection * sec; 787 struct elf_link_hash_entry * h; 788 bfd_vma relocation; 789 bfd_reloc_status_type r; 790 const char * name = NULL; 791 int r_type; 792 793 r_type = ELF32_R_TYPE (rel->r_info); 794 795 if ( r_type == R_XSTORMY16_GNU_VTINHERIT 796 || r_type == R_XSTORMY16_GNU_VTENTRY) 797 continue; 798 799 r_symndx = ELF32_R_SYM (rel->r_info); 800 howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info); 801 h = NULL; 802 sym = NULL; 803 sec = NULL; 804 805 if (r_symndx < symtab_hdr->sh_info) 806 { 807 sym = local_syms + r_symndx; 808 sec = local_sections [r_symndx]; 809 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 810 } 811 else 812 { 813 bfd_boolean unresolved_reloc, warned, ignored; 814 815 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 816 r_symndx, symtab_hdr, sym_hashes, 817 h, sec, relocation, 818 unresolved_reloc, warned, ignored); 819 } 820 821 if (sec != NULL && discarded_section (sec)) 822 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 823 rel, 1, relend, howto, 0, contents); 824 825 if (bfd_link_relocatable (info)) 826 continue; 827 828 if (h != NULL) 829 name = h->root.root.string; 830 else 831 { 832 name = (bfd_elf_string_from_elf_section 833 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 834 if (name == NULL || *name == '\0') 835 name = bfd_section_name (input_bfd, sec); 836 } 837 838 switch (ELF32_R_TYPE (rel->r_info)) 839 { 840 case R_XSTORMY16_24: 841 { 842 bfd_vma reloc = relocation + rel->r_addend; 843 unsigned int x; 844 845 x = bfd_get_32 (input_bfd, contents + rel->r_offset); 846 x &= 0x0000ff00; 847 x |= reloc & 0xff; 848 x |= (reloc << 8) & 0xffff0000; 849 bfd_put_32 (input_bfd, x, contents + rel->r_offset); 850 851 if (reloc & ~0xffffff) 852 r = bfd_reloc_overflow; 853 else 854 r = bfd_reloc_ok; 855 break; 856 } 857 858 case R_XSTORMY16_FPTR16: 859 { 860 bfd_vma *plt_offset; 861 862 if (h != NULL) 863 plt_offset = &h->plt.offset; 864 else 865 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx; 866 867 if (relocation <= 0xffff) 868 { 869 /* If the symbol is in range for a 16-bit address, we should 870 have deallocated the plt entry in relax_section. */ 871 BFD_ASSERT (*plt_offset == (bfd_vma) -1); 872 } 873 else 874 { 875 /* If the symbol is out of range for a 16-bit address, 876 we must have allocated a plt entry. */ 877 BFD_ASSERT (*plt_offset != (bfd_vma) -1); 878 879 /* If this is the first time we've processed this symbol, 880 fill in the plt entry with the correct symbol address. */ 881 if ((*plt_offset & 1) == 0) 882 { 883 unsigned int x; 884 885 x = 0x00000200; /* jmpf */ 886 x |= relocation & 0xff; 887 x |= (relocation << 8) & 0xffff0000; 888 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset); 889 *plt_offset |= 1; 890 } 891 892 relocation = (splt->output_section->vma 893 + splt->output_offset 894 + (*plt_offset & -2)); 895 } 896 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 897 contents, rel->r_offset, 898 relocation, 0); 899 break; 900 } 901 902 default: 903 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 904 contents, rel->r_offset, 905 relocation, rel->r_addend); 906 break; 907 } 908 909 if (r != bfd_reloc_ok) 910 { 911 const char * msg = NULL; 912 913 switch (r) 914 { 915 case bfd_reloc_overflow: 916 (*info->callbacks->reloc_overflow) 917 (info, (h ? &h->root : NULL), name, howto->name, 918 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 919 break; 920 921 case bfd_reloc_undefined: 922 (*info->callbacks->undefined_symbol) 923 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 924 break; 925 926 case bfd_reloc_outofrange: 927 msg = _("internal error: out of range error"); 928 break; 929 930 case bfd_reloc_notsupported: 931 msg = _("internal error: unsupported relocation error"); 932 break; 933 934 case bfd_reloc_dangerous: 935 msg = _("internal error: dangerous relocation"); 936 break; 937 938 default: 939 msg = _("internal error: unknown error"); 940 break; 941 } 942 943 if (msg) 944 (*info->callbacks->warning) (info, msg, name, input_bfd, 945 input_section, rel->r_offset); 946 } 947 } 948 949 return TRUE; 950} 951 952/* This must exist if dynobj is ever set. */ 953 954static bfd_boolean 955xstormy16_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED, 956 struct bfd_link_info *info) 957{ 958 bfd *dynobj = elf_hash_table (info)->dynobj; 959 asection *splt = elf_hash_table (info)->splt; 960 961 /* As an extra sanity check, verify that all plt entries have 962 been filled in. */ 963 964 if (dynobj != NULL && splt != NULL) 965 { 966 bfd_byte *contents = splt->contents; 967 unsigned int i, size = splt->size; 968 969 for (i = 0; i < size; i += 4) 970 { 971 unsigned int x = bfd_get_32 (dynobj, contents + i); 972 973 BFD_ASSERT (x != 0); 974 } 975 } 976 977 return TRUE; 978} 979 980/* Return the section that should be marked against GC for a given 981 relocation. */ 982 983static asection * 984xstormy16_elf_gc_mark_hook (asection *sec, 985 struct bfd_link_info *info, 986 Elf_Internal_Rela *rel, 987 struct elf_link_hash_entry *h, 988 Elf_Internal_Sym *sym) 989{ 990 if (h != NULL) 991 switch (ELF32_R_TYPE (rel->r_info)) 992 { 993 case R_XSTORMY16_GNU_VTINHERIT: 994 case R_XSTORMY16_GNU_VTENTRY: 995 return NULL; 996 } 997 998 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 999} 1000 1001#define ELF_ARCH bfd_arch_xstormy16 1002#define ELF_MACHINE_CODE EM_XSTORMY16 1003#define ELF_MAXPAGESIZE 0x100 1004 1005#define TARGET_LITTLE_SYM xstormy16_elf32_vec 1006#define TARGET_LITTLE_NAME "elf32-xstormy16" 1007 1008#define elf_info_to_howto_rel NULL 1009#define elf_info_to_howto xstormy16_info_to_howto_rela 1010#define elf_backend_relocate_section xstormy16_elf_relocate_section 1011#define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook 1012#define elf_backend_check_relocs xstormy16_elf_check_relocs 1013#define elf_backend_always_size_sections \ 1014 xstormy16_elf_always_size_sections 1015#define elf_backend_omit_section_dynsym \ 1016 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 1017#define elf_backend_finish_dynamic_sections \ 1018 xstormy16_elf_finish_dynamic_sections 1019 1020#define elf_backend_can_gc_sections 1 1021#define elf_backend_rela_normal 1 1022 1023#define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup 1024#define bfd_elf32_bfd_reloc_name_lookup \ 1025 xstormy16_reloc_name_lookup 1026#define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section 1027 1028#include "elf32-target.h" 1029