1/* Xstormy16-specific support for 32-bit ELF. 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006 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 2 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, MA 02110-1301, 20 USA. */ 21 22#include "bfd.h" 23#include "sysdep.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 31static bfd_reloc_status_type 32xstormy16_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 72static 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 270static 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 306typedef 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 313static 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 332static reloc_howto_type * 333xstormy16_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/* Set the howto pointer for an XSTORMY16 ELF reloc. */ 353 354static void 355xstormy16_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED, 356 arelent * cache_ptr, 357 Elf_Internal_Rela * dst) 358{ 359 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 360 361 if (r_type <= (unsigned int) R_XSTORMY16_12) 362 cache_ptr->howto = &xstormy16_elf_howto_table [r_type]; 363 else if (r_type - R_XSTORMY16_GNU_VTINHERIT 364 <= (unsigned int) R_XSTORMY16_GNU_VTENTRY) 365 cache_ptr->howto 366 = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT]; 367 else 368 abort (); 369} 370 371/* We support 16-bit pointers to code above 64k by generating a thunk 372 below 64k containing a JMPF instruction to the final address. We 373 cannot, unfortunately, minimize the number of thunks unless the 374 -relax switch is given, as otherwise we have no idea where the 375 sections will fall in the address space. */ 376 377static bfd_boolean 378xstormy16_elf_check_relocs (bfd *abfd, 379 struct bfd_link_info *info, 380 asection *sec, 381 const Elf_Internal_Rela *relocs) 382{ 383 const Elf_Internal_Rela *rel, *relend; 384 struct elf_link_hash_entry **sym_hashes; 385 Elf_Internal_Shdr *symtab_hdr; 386 bfd_vma *local_plt_offsets; 387 asection *splt; 388 bfd *dynobj; 389 390 if (info->relocatable) 391 return TRUE; 392 393 symtab_hdr = &elf_tdata(abfd)->symtab_hdr; 394 sym_hashes = elf_sym_hashes (abfd); 395 local_plt_offsets = elf_local_got_offsets (abfd); 396 splt = NULL; 397 dynobj = elf_hash_table(info)->dynobj; 398 399 relend = relocs + sec->reloc_count; 400 for (rel = relocs; rel < relend; ++rel) 401 { 402 unsigned long r_symndx; 403 struct elf_link_hash_entry *h; 404 bfd_vma *offset; 405 406 r_symndx = ELF32_R_SYM (rel->r_info); 407 if (r_symndx < symtab_hdr->sh_info) 408 h = NULL; 409 else 410 { 411 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 412 while (h->root.type == bfd_link_hash_indirect 413 || h->root.type == bfd_link_hash_warning) 414 h = (struct elf_link_hash_entry *) h->root.u.i.link; 415 } 416 417 switch (ELF32_R_TYPE (rel->r_info)) 418 { 419 /* This relocation describes a 16-bit pointer to a function. 420 We may need to allocate a thunk in low memory; reserve memory 421 for it now. */ 422 case R_XSTORMY16_FPTR16: 423 if (rel->r_addend != 0) 424 { 425 (*info->callbacks->warning) 426 (info, _("non-zero addend in @fptr reloc"), 0, 427 abfd, 0, 0); 428 } 429 430 if (dynobj == NULL) 431 elf_hash_table (info)->dynobj = dynobj = abfd; 432 if (splt == NULL) 433 { 434 splt = bfd_get_section_by_name (dynobj, ".plt"); 435 if (splt == NULL) 436 { 437 splt = bfd_make_section_with_flags (dynobj, ".plt", 438 (SEC_ALLOC 439 | SEC_LOAD 440 | SEC_HAS_CONTENTS 441 | SEC_IN_MEMORY 442 | SEC_LINKER_CREATED 443 | SEC_READONLY 444 | SEC_CODE)); 445 446 if (splt == NULL 447 || ! bfd_set_section_alignment (dynobj, splt, 1)) 448 return FALSE; 449 } 450 } 451 452 if (h != NULL) 453 offset = &h->plt.offset; 454 else 455 { 456 if (local_plt_offsets == NULL) 457 { 458 size_t size; 459 unsigned int i; 460 461 size = symtab_hdr->sh_info * sizeof (bfd_vma); 462 local_plt_offsets = bfd_alloc (abfd, size); 463 if (local_plt_offsets == NULL) 464 return FALSE; 465 elf_local_got_offsets (abfd) = local_plt_offsets; 466 467 for (i = 0; i < symtab_hdr->sh_info; i++) 468 local_plt_offsets[i] = (bfd_vma) -1; 469 } 470 offset = &local_plt_offsets[r_symndx]; 471 } 472 473 if (*offset == (bfd_vma) -1) 474 { 475 *offset = splt->size; 476 splt->size += 4; 477 } 478 break; 479 480 /* This relocation describes the C++ object vtable hierarchy. 481 Reconstruct it for later use during GC. */ 482 case R_XSTORMY16_GNU_VTINHERIT: 483 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 484 return FALSE; 485 break; 486 487 /* This relocation describes which C++ vtable entries are actually 488 used. Record for later use during GC. */ 489 case R_XSTORMY16_GNU_VTENTRY: 490 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 491 return FALSE; 492 break; 493 } 494 } 495 496 return TRUE; 497} 498 499/* A subroutine of xstormy16_elf_relax_section. If the global symbol H 500 is within the low 64k, remove any entry for it in the plt. */ 501 502struct relax_plt_data 503{ 504 asection *splt; 505 bfd_boolean *again; 506}; 507 508static bfd_boolean 509xstormy16_relax_plt_check (struct elf_link_hash_entry *h, void * xdata) 510{ 511 struct relax_plt_data *data = (struct relax_plt_data *) xdata; 512 513 if (h->root.type == bfd_link_hash_warning) 514 h = (struct elf_link_hash_entry *) h->root.u.i.link; 515 516 if (h->plt.offset != (bfd_vma) -1) 517 { 518 bfd_vma address; 519 520 if (h->root.type == bfd_link_hash_undefined 521 || h->root.type == bfd_link_hash_undefweak) 522 address = 0; 523 else 524 address = (h->root.u.def.section->output_section->vma 525 + h->root.u.def.section->output_offset 526 + h->root.u.def.value); 527 528 if (address <= 0xffff) 529 { 530 h->plt.offset = -1; 531 data->splt->size -= 4; 532 *data->again = TRUE; 533 } 534 } 535 536 return TRUE; 537} 538 539/* A subroutine of xstormy16_elf_relax_section. If the global symbol H 540 previously had a plt entry, give it a new entry offset. */ 541 542static bfd_boolean 543xstormy16_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata) 544{ 545 bfd_vma *entry = (bfd_vma *) xdata; 546 547 if (h->root.type == bfd_link_hash_warning) 548 h = (struct elf_link_hash_entry *) h->root.u.i.link; 549 550 if (h->plt.offset != (bfd_vma) -1) 551 { 552 h->plt.offset = *entry; 553 *entry += 4; 554 } 555 556 return TRUE; 557} 558 559static bfd_boolean 560xstormy16_elf_relax_section (bfd *dynobj, 561 asection *splt, 562 struct bfd_link_info *info, 563 bfd_boolean *again) 564{ 565 struct relax_plt_data relax_plt_data; 566 bfd *ibfd; 567 568 /* Assume nothing changes. */ 569 *again = FALSE; 570 571 if (info->relocatable) 572 return TRUE; 573 574 /* We only relax the .plt section at the moment. */ 575 if (dynobj != elf_hash_table (info)->dynobj 576 || strcmp (splt->name, ".plt") != 0) 577 return TRUE; 578 579 /* Quick check for an empty plt. */ 580 if (splt->size == 0) 581 return TRUE; 582 583 /* Map across all global symbols; see which ones happen to 584 fall in the low 64k. */ 585 relax_plt_data.splt = splt; 586 relax_plt_data.again = again; 587 elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check, 588 &relax_plt_data); 589 590 /* Likewise for local symbols, though that's somewhat less convenient 591 as we have to walk the list of input bfds and swap in symbol data. */ 592 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next) 593 { 594 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd); 595 Elf_Internal_Shdr *symtab_hdr; 596 Elf_Internal_Sym *isymbuf = NULL; 597 unsigned int idx; 598 599 if (! local_plt_offsets) 600 continue; 601 602 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 603 if (symtab_hdr->sh_info != 0) 604 { 605 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 606 if (isymbuf == NULL) 607 isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr, 608 symtab_hdr->sh_info, 0, 609 NULL, NULL, NULL); 610 if (isymbuf == NULL) 611 return FALSE; 612 } 613 614 for (idx = 0; idx < symtab_hdr->sh_info; ++idx) 615 { 616 Elf_Internal_Sym *isym; 617 asection *tsec; 618 bfd_vma address; 619 620 if (local_plt_offsets[idx] == (bfd_vma) -1) 621 continue; 622 623 isym = &isymbuf[idx]; 624 if (isym->st_shndx == SHN_UNDEF) 625 continue; 626 else if (isym->st_shndx == SHN_ABS) 627 tsec = bfd_abs_section_ptr; 628 else if (isym->st_shndx == SHN_COMMON) 629 tsec = bfd_com_section_ptr; 630 else 631 tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx); 632 633 address = (tsec->output_section->vma 634 + tsec->output_offset 635 + isym->st_value); 636 if (address <= 0xffff) 637 { 638 local_plt_offsets[idx] = -1; 639 splt->size -= 4; 640 *again = TRUE; 641 } 642 } 643 644 if (isymbuf != NULL 645 && symtab_hdr->contents != (unsigned char *) isymbuf) 646 { 647 if (! info->keep_memory) 648 free (isymbuf); 649 else 650 { 651 /* Cache the symbols for elf_link_input_bfd. */ 652 symtab_hdr->contents = (unsigned char *) isymbuf; 653 } 654 } 655 } 656 657 /* If we changed anything, walk the symbols again to reallocate 658 .plt entry addresses. */ 659 if (*again && splt->size > 0) 660 { 661 bfd_vma entry = 0; 662 663 elf_link_hash_traverse (elf_hash_table (info), 664 xstormy16_relax_plt_realloc, &entry); 665 666 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next) 667 { 668 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd); 669 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info; 670 unsigned int idx; 671 672 if (! local_plt_offsets) 673 continue; 674 675 for (idx = 0; idx < nlocals; ++idx) 676 if (local_plt_offsets[idx] != (bfd_vma) -1) 677 { 678 local_plt_offsets[idx] = entry; 679 entry += 4; 680 } 681 } 682 } 683 684 return TRUE; 685} 686 687static bfd_boolean 688xstormy16_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 689 struct bfd_link_info *info) 690{ 691 bfd *dynobj; 692 asection *splt; 693 694 if (info->relocatable) 695 return TRUE; 696 697 dynobj = elf_hash_table (info)->dynobj; 698 if (dynobj == NULL) 699 return TRUE; 700 701 splt = bfd_get_section_by_name (dynobj, ".plt"); 702 BFD_ASSERT (splt != NULL); 703 704 splt->contents = bfd_zalloc (dynobj, splt->size); 705 if (splt->contents == NULL) 706 return FALSE; 707 708 return TRUE; 709} 710 711/* Relocate an XSTORMY16 ELF section. 712 713 The RELOCATE_SECTION function is called by the new ELF backend linker 714 to handle the relocations for a section. 715 716 The relocs are always passed as Rela structures; if the section 717 actually uses Rel structures, the r_addend field will always be 718 zero. 719 720 This function is responsible for adjusting the section contents as 721 necessary, and (if using Rela relocs and generating a relocatable 722 output file) adjusting the reloc addend as necessary. 723 724 This function does not have to worry about setting the reloc 725 address or the reloc symbol index. 726 727 LOCAL_SYMS is a pointer to the swapped in local symbols. 728 729 LOCAL_SECTIONS is an array giving the section in the input file 730 corresponding to the st_shndx field of each local symbol. 731 732 The global hash table entry for the global symbols can be found 733 via elf_sym_hashes (input_bfd). 734 735 When generating relocatable output, this function must handle 736 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 737 going to be the section symbol corresponding to the output 738 section, which means that the addend must be adjusted 739 accordingly. */ 740 741static bfd_boolean 742xstormy16_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED, 743 struct bfd_link_info * info, 744 bfd * input_bfd, 745 asection * input_section, 746 bfd_byte * contents, 747 Elf_Internal_Rela * relocs, 748 Elf_Internal_Sym * local_syms, 749 asection ** local_sections) 750{ 751 Elf_Internal_Shdr * symtab_hdr; 752 struct elf_link_hash_entry ** sym_hashes; 753 Elf_Internal_Rela * rel; 754 Elf_Internal_Rela * relend; 755 bfd *dynobj; 756 asection *splt; 757 758 if (info->relocatable) 759 return TRUE; 760 761 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 762 sym_hashes = elf_sym_hashes (input_bfd); 763 relend = relocs + input_section->reloc_count; 764 765 dynobj = elf_hash_table (info)->dynobj; 766 splt = NULL; 767 if (dynobj != NULL) 768 splt = bfd_get_section_by_name (dynobj, ".plt"); 769 770 for (rel = relocs; rel < relend; rel ++) 771 { 772 reloc_howto_type * howto; 773 unsigned long r_symndx; 774 Elf_Internal_Sym * sym; 775 asection * sec; 776 struct elf_link_hash_entry * h; 777 bfd_vma relocation; 778 bfd_reloc_status_type r; 779 const char * name = NULL; 780 int r_type; 781 782 r_type = ELF32_R_TYPE (rel->r_info); 783 784 if ( r_type == R_XSTORMY16_GNU_VTINHERIT 785 || r_type == R_XSTORMY16_GNU_VTENTRY) 786 continue; 787 788 r_symndx = ELF32_R_SYM (rel->r_info); 789 howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info); 790 h = NULL; 791 sym = NULL; 792 sec = NULL; 793 794 if (r_symndx < symtab_hdr->sh_info) 795 { 796 sym = local_syms + r_symndx; 797 sec = local_sections [r_symndx]; 798 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 799 } 800 else 801 { 802 bfd_boolean unresolved_reloc, warned; 803 804 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 805 r_symndx, symtab_hdr, sym_hashes, 806 h, sec, relocation, 807 unresolved_reloc, warned); 808 } 809 810 if (h != NULL) 811 name = h->root.root.string; 812 else 813 { 814 name = (bfd_elf_string_from_elf_section 815 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 816 if (name == NULL || *name == '\0') 817 name = bfd_section_name (input_bfd, sec); 818 } 819 820 switch (ELF32_R_TYPE (rel->r_info)) 821 { 822 case R_XSTORMY16_24: 823 { 824 bfd_vma reloc = relocation + rel->r_addend; 825 unsigned int x; 826 827 x = bfd_get_32 (input_bfd, contents + rel->r_offset); 828 x &= 0x0000ff00; 829 x |= reloc & 0xff; 830 x |= (reloc << 8) & 0xffff0000; 831 bfd_put_32 (input_bfd, x, contents + rel->r_offset); 832 833 if (reloc & ~0xffffff) 834 r = bfd_reloc_overflow; 835 else 836 r = bfd_reloc_ok; 837 break; 838 } 839 840 case R_XSTORMY16_FPTR16: 841 { 842 bfd_vma *plt_offset; 843 844 if (h != NULL) 845 plt_offset = &h->plt.offset; 846 else 847 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx; 848 849 if (relocation <= 0xffff) 850 { 851 /* If the symbol is in range for a 16-bit address, we should 852 have deallocated the plt entry in relax_section. */ 853 BFD_ASSERT (*plt_offset == (bfd_vma) -1); 854 } 855 else 856 { 857 /* If the symbol is out of range for a 16-bit address, 858 we must have allocated a plt entry. */ 859 BFD_ASSERT (*plt_offset != (bfd_vma) -1); 860 861 /* If this is the first time we've processed this symbol, 862 fill in the plt entry with the correct symbol address. */ 863 if ((*plt_offset & 1) == 0) 864 { 865 unsigned int x; 866 867 x = 0x00000200; /* jmpf */ 868 x |= relocation & 0xff; 869 x |= (relocation << 8) & 0xffff0000; 870 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset); 871 *plt_offset |= 1; 872 } 873 874 relocation = (splt->output_section->vma 875 + splt->output_offset 876 + (*plt_offset & -2)); 877 } 878 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 879 contents, rel->r_offset, 880 relocation, 0); 881 break; 882 } 883 884 default: 885 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 886 contents, rel->r_offset, 887 relocation, rel->r_addend); 888 break; 889 } 890 891 if (r != bfd_reloc_ok) 892 { 893 const char * msg = NULL; 894 895 switch (r) 896 { 897 case bfd_reloc_overflow: 898 r = info->callbacks->reloc_overflow 899 (info, (h ? &h->root : NULL), name, howto->name, 900 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 901 break; 902 903 case bfd_reloc_undefined: 904 r = info->callbacks->undefined_symbol 905 (info, name, input_bfd, input_section, rel->r_offset, 906 TRUE); 907 break; 908 909 case bfd_reloc_outofrange: 910 msg = _("internal error: out of range error"); 911 break; 912 913 case bfd_reloc_notsupported: 914 msg = _("internal error: unsupported relocation error"); 915 break; 916 917 case bfd_reloc_dangerous: 918 msg = _("internal error: dangerous relocation"); 919 break; 920 921 default: 922 msg = _("internal error: unknown error"); 923 break; 924 } 925 926 if (msg) 927 r = info->callbacks->warning 928 (info, msg, name, input_bfd, input_section, rel->r_offset); 929 930 if (! r) 931 return FALSE; 932 } 933 } 934 935 return TRUE; 936} 937 938/* This must exist if dynobj is ever set. */ 939 940static bfd_boolean 941xstormy16_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED, 942 struct bfd_link_info *info) 943{ 944 bfd *dynobj; 945 asection *splt; 946 947 /* As an extra sanity check, verify that all plt entries have 948 been filled in. */ 949 950 if ((dynobj = elf_hash_table (info)->dynobj) != NULL 951 && (splt = bfd_get_section_by_name (dynobj, ".plt")) != NULL) 952 { 953 bfd_byte *contents = splt->contents; 954 unsigned int i, size = splt->size; 955 956 for (i = 0; i < size; i += 4) 957 { 958 unsigned int x = bfd_get_32 (dynobj, contents + i); 959 960 BFD_ASSERT (x != 0); 961 } 962 } 963 964 return TRUE; 965} 966 967/* Return the section that should be marked against GC for a given 968 relocation. */ 969 970static asection * 971xstormy16_elf_gc_mark_hook (asection *sec, 972 struct bfd_link_info *info, 973 Elf_Internal_Rela *rel, 974 struct elf_link_hash_entry *h, 975 Elf_Internal_Sym *sym) 976{ 977 if (h != NULL) 978 switch (ELF32_R_TYPE (rel->r_info)) 979 { 980 case R_XSTORMY16_GNU_VTINHERIT: 981 case R_XSTORMY16_GNU_VTENTRY: 982 return NULL; 983 } 984 985 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 986} 987 988#define ELF_ARCH bfd_arch_xstormy16 989#define ELF_MACHINE_CODE EM_XSTORMY16 990#define ELF_MAXPAGESIZE 0x100 991 992#define TARGET_LITTLE_SYM bfd_elf32_xstormy16_vec 993#define TARGET_LITTLE_NAME "elf32-xstormy16" 994 995#define elf_info_to_howto_rel NULL 996#define elf_info_to_howto xstormy16_info_to_howto_rela 997#define elf_backend_relocate_section xstormy16_elf_relocate_section 998#define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook 999#define elf_backend_check_relocs xstormy16_elf_check_relocs 1000#define elf_backend_always_size_sections \ 1001 xstormy16_elf_always_size_sections 1002#define elf_backend_omit_section_dynsym \ 1003 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 1004#define elf_backend_finish_dynamic_sections \ 1005 xstormy16_elf_finish_dynamic_sections 1006 1007#define elf_backend_can_gc_sections 1 1008#define elf_backend_rela_normal 1 1009 1010#define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup 1011#define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section 1012 1013#include "elf32-target.h" 1014