1 /* BFD back-end for National Semiconductor's CR16 ELF 2 Copyright (C) 2007-2022 Free Software Foundation, Inc. 3 Written by M R Swami Reddy. 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 Foundation, 19 Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 20 21 #include "sysdep.h" 22 #include "bfd.h" 23 #include "bfdlink.h" 24 #include "libbfd.h" 25 #include "libiberty.h" 26 #include "elf-bfd.h" 27 #include "elf/cr16.h" 28 #include "elf32-cr16.h" 29 30 /* The cr16 linker needs to keep track of the number of relocs that 31 it decides to copy in check_relocs for each symbol. This is so 32 that it can discard PC relative relocs if it doesn't need them when 33 linking with -Bsymbolic. We store the information in a field 34 extending the regular ELF linker hash table. */ 35 36 struct elf32_cr16_link_hash_entry 37 { 38 /* The basic elf link hash table entry. */ 39 struct elf_link_hash_entry root; 40 41 /* For function symbols, the number of times this function is 42 called directly (ie by name). */ 43 unsigned int direct_calls; 44 45 /* For function symbols, the size of this function's stack 46 (if <= 255 bytes). We stuff this into "call" instructions 47 to this target when it's valid and profitable to do so. 48 49 This does not include stack allocated by movm! */ 50 unsigned char stack_size; 51 52 /* For function symbols, arguments (if any) for movm instruction 53 in the prologue. We stuff this value into "call" instructions 54 to the target when it's valid and profitable to do so. */ 55 unsigned char movm_args; 56 57 /* For function symbols, the amount of stack space that would be allocated 58 by the movm instruction. This is redundant with movm_args, but we 59 add it to the hash table to avoid computing it over and over. */ 60 unsigned char movm_stack_size; 61 62 /* Used to mark functions which have had redundant parts of their 63 prologue deleted. */ 64 #define CR16_DELETED_PROLOGUE_BYTES 0x1 65 unsigned char flags; 66 67 /* Calculated value. */ 68 bfd_vma value; 69 }; 70 71 /* cr16_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */ 72 73 struct cr16_reloc_map 74 { 75 bfd_reloc_code_real_type bfd_reloc_enum; /* BFD relocation enum. */ 76 unsigned short cr16_reloc_type; /* CR16 relocation type. */ 77 }; 78 79 static const struct cr16_reloc_map cr16_reloc_map[R_CR16_MAX] = 80 { 81 {BFD_RELOC_NONE, R_CR16_NONE}, 82 {BFD_RELOC_CR16_NUM8, R_CR16_NUM8}, 83 {BFD_RELOC_CR16_NUM16, R_CR16_NUM16}, 84 {BFD_RELOC_CR16_NUM32, R_CR16_NUM32}, 85 {BFD_RELOC_CR16_NUM32a, R_CR16_NUM32a}, 86 {BFD_RELOC_CR16_REGREL4, R_CR16_REGREL4}, 87 {BFD_RELOC_CR16_REGREL4a, R_CR16_REGREL4a}, 88 {BFD_RELOC_CR16_REGREL14, R_CR16_REGREL14}, 89 {BFD_RELOC_CR16_REGREL14a, R_CR16_REGREL14a}, 90 {BFD_RELOC_CR16_REGREL16, R_CR16_REGREL16}, 91 {BFD_RELOC_CR16_REGREL20, R_CR16_REGREL20}, 92 {BFD_RELOC_CR16_REGREL20a, R_CR16_REGREL20a}, 93 {BFD_RELOC_CR16_ABS20, R_CR16_ABS20}, 94 {BFD_RELOC_CR16_ABS24, R_CR16_ABS24}, 95 {BFD_RELOC_CR16_IMM4, R_CR16_IMM4}, 96 {BFD_RELOC_CR16_IMM8, R_CR16_IMM8}, 97 {BFD_RELOC_CR16_IMM16, R_CR16_IMM16}, 98 {BFD_RELOC_CR16_IMM20, R_CR16_IMM20}, 99 {BFD_RELOC_CR16_IMM24, R_CR16_IMM24}, 100 {BFD_RELOC_CR16_IMM32, R_CR16_IMM32}, 101 {BFD_RELOC_CR16_IMM32a, R_CR16_IMM32a}, 102 {BFD_RELOC_CR16_DISP4, R_CR16_DISP4}, 103 {BFD_RELOC_CR16_DISP8, R_CR16_DISP8}, 104 {BFD_RELOC_CR16_DISP16, R_CR16_DISP16}, 105 {BFD_RELOC_CR16_DISP24, R_CR16_DISP24}, 106 {BFD_RELOC_CR16_DISP24a, R_CR16_DISP24a}, 107 {BFD_RELOC_CR16_SWITCH8, R_CR16_SWITCH8}, 108 {BFD_RELOC_CR16_SWITCH16, R_CR16_SWITCH16}, 109 {BFD_RELOC_CR16_SWITCH32, R_CR16_SWITCH32}, 110 {BFD_RELOC_CR16_GOT_REGREL20, R_CR16_GOT_REGREL20}, 111 {BFD_RELOC_CR16_GOTC_REGREL20, R_CR16_GOTC_REGREL20}, 112 {BFD_RELOC_CR16_GLOB_DAT, R_CR16_GLOB_DAT} 113 }; 114 115 static reloc_howto_type cr16_elf_howto_table[] = 116 { 117 HOWTO (R_CR16_NONE, /* type */ 118 0, /* rightshift */ 119 0, /* size */ 120 0, /* bitsize */ 121 false, /* pc_relative */ 122 0, /* bitpos */ 123 complain_overflow_dont, /* complain_on_overflow */ 124 bfd_elf_generic_reloc, /* special_function */ 125 "R_CR16_NONE", /* name */ 126 false, /* partial_inplace */ 127 0, /* src_mask */ 128 0, /* dst_mask */ 129 false), /* pcrel_offset */ 130 131 HOWTO (R_CR16_NUM8, /* type */ 132 0, /* rightshift */ 133 1, /* size */ 134 8, /* bitsize */ 135 false, /* pc_relative */ 136 0, /* bitpos */ 137 complain_overflow_bitfield,/* complain_on_overflow */ 138 bfd_elf_generic_reloc, /* special_function */ 139 "R_CR16_NUM8", /* name */ 140 false, /* partial_inplace */ 141 0x0, /* src_mask */ 142 0xff, /* dst_mask */ 143 false), /* pcrel_offset */ 144 145 HOWTO (R_CR16_NUM16, /* type */ 146 0, /* rightshift */ 147 2, /* size */ 148 16, /* bitsize */ 149 false, /* pc_relative */ 150 0, /* bitpos */ 151 complain_overflow_bitfield,/* complain_on_overflow */ 152 bfd_elf_generic_reloc, /* special_function */ 153 "R_CR16_NUM16", /* name */ 154 false, /* partial_inplace */ 155 0x0, /* src_mask */ 156 0xffff, /* dst_mask */ 157 false), /* pcrel_offset */ 158 159 HOWTO (R_CR16_NUM32, /* type */ 160 0, /* rightshift */ 161 4, /* size */ 162 32, /* bitsize */ 163 false, /* pc_relative */ 164 0, /* bitpos */ 165 complain_overflow_bitfield,/* complain_on_overflow */ 166 bfd_elf_generic_reloc, /* special_function */ 167 "R_CR16_NUM32", /* name */ 168 false, /* partial_inplace */ 169 0x0, /* src_mask */ 170 0xffffffff, /* dst_mask */ 171 false), /* pcrel_offset */ 172 173 HOWTO (R_CR16_NUM32a, /* type */ 174 1, /* rightshift */ 175 4, /* size */ 176 32, /* bitsize */ 177 false, /* pc_relative */ 178 0, /* bitpos */ 179 complain_overflow_bitfield,/* complain_on_overflow */ 180 bfd_elf_generic_reloc, /* special_function */ 181 "R_CR16_NUM32a", /* name */ 182 false, /* partial_inplace */ 183 0x0, /* src_mask */ 184 0xffffffff, /* dst_mask */ 185 false), /* pcrel_offset */ 186 187 HOWTO (R_CR16_REGREL4, /* type */ 188 0, /* rightshift */ 189 1, /* size */ 190 4, /* bitsize */ 191 false, /* pc_relative */ 192 0, /* bitpos */ 193 complain_overflow_bitfield,/* complain_on_overflow */ 194 bfd_elf_generic_reloc, /* special_function */ 195 "R_CR16_REGREL4", /* name */ 196 false, /* partial_inplace */ 197 0x0, /* src_mask */ 198 0xf, /* dst_mask */ 199 false), /* pcrel_offset */ 200 201 HOWTO (R_CR16_REGREL4a, /* type */ 202 0, /* rightshift */ 203 1, /* size */ 204 4, /* bitsize */ 205 false, /* pc_relative */ 206 0, /* bitpos */ 207 complain_overflow_bitfield,/* complain_on_overflow */ 208 bfd_elf_generic_reloc, /* special_function */ 209 "R_CR16_REGREL4a", /* name */ 210 false, /* partial_inplace */ 211 0x0, /* src_mask */ 212 0xf, /* dst_mask */ 213 false), /* pcrel_offset */ 214 215 HOWTO (R_CR16_REGREL14, /* type */ 216 0, /* rightshift */ 217 2, /* size */ 218 14, /* bitsize */ 219 false, /* pc_relative */ 220 0, /* bitpos */ 221 complain_overflow_bitfield,/* complain_on_overflow */ 222 bfd_elf_generic_reloc, /* special_function */ 223 "R_CR16_REGREL14", /* name */ 224 false, /* partial_inplace */ 225 0x0, /* src_mask */ 226 0x3fff, /* dst_mask */ 227 false), /* pcrel_offset */ 228 229 HOWTO (R_CR16_REGREL14a, /* type */ 230 0, /* rightshift */ 231 2, /* size */ 232 14, /* bitsize */ 233 false, /* pc_relative */ 234 0, /* bitpos */ 235 complain_overflow_bitfield,/* complain_on_overflow */ 236 bfd_elf_generic_reloc, /* special_function */ 237 "R_CR16_REGREL14a", /* name */ 238 false, /* partial_inplace */ 239 0x0, /* src_mask */ 240 0x3fff, /* dst_mask */ 241 false), /* pcrel_offset */ 242 243 HOWTO (R_CR16_REGREL16, /* type */ 244 0, /* rightshift */ 245 2, /* size */ 246 16, /* bitsize */ 247 false, /* pc_relative */ 248 0, /* bitpos */ 249 complain_overflow_bitfield,/* complain_on_overflow */ 250 bfd_elf_generic_reloc, /* special_function */ 251 "R_CR16_REGREL16", /* name */ 252 false, /* partial_inplace */ 253 0x0, /* src_mask */ 254 0xffff, /* dst_mask */ 255 false), /* pcrel_offset */ 256 257 HOWTO (R_CR16_REGREL20, /* type */ 258 0, /* rightshift */ 259 4, /* size */ 260 20, /* bitsize */ 261 false, /* pc_relative */ 262 0, /* bitpos */ 263 complain_overflow_bitfield,/* complain_on_overflow */ 264 bfd_elf_generic_reloc, /* special_function */ 265 "R_CR16_REGREL20", /* name */ 266 false, /* partial_inplace */ 267 0x0, /* src_mask */ 268 0xfffff, /* dst_mask */ 269 false), /* pcrel_offset */ 270 271 HOWTO (R_CR16_REGREL20a, /* type */ 272 0, /* rightshift */ 273 4, /* size */ 274 20, /* bitsize */ 275 false, /* pc_relative */ 276 0, /* bitpos */ 277 complain_overflow_bitfield,/* complain_on_overflow */ 278 bfd_elf_generic_reloc, /* special_function */ 279 "R_CR16_REGREL20a", /* name */ 280 false, /* partial_inplace */ 281 0x0, /* src_mask */ 282 0xfffff, /* dst_mask */ 283 false), /* pcrel_offset */ 284 285 HOWTO (R_CR16_ABS20, /* type */ 286 0, /* rightshift */ 287 4, /* size */ 288 20, /* bitsize */ 289 false, /* pc_relative */ 290 0, /* bitpos */ 291 complain_overflow_bitfield,/* complain_on_overflow */ 292 bfd_elf_generic_reloc, /* special_function */ 293 "R_CR16_ABS20", /* name */ 294 false, /* partial_inplace */ 295 0x0, /* src_mask */ 296 0xfffff, /* dst_mask */ 297 false), /* pcrel_offset */ 298 299 HOWTO (R_CR16_ABS24, /* type */ 300 0, /* rightshift */ 301 4, /* size */ 302 24, /* bitsize */ 303 false, /* pc_relative */ 304 0, /* bitpos */ 305 complain_overflow_bitfield,/* complain_on_overflow */ 306 bfd_elf_generic_reloc, /* special_function */ 307 "R_CR16_ABS24", /* name */ 308 false, /* partial_inplace */ 309 0x0, /* src_mask */ 310 0xffffff, /* dst_mask */ 311 false), /* pcrel_offset */ 312 313 HOWTO (R_CR16_IMM4, /* type */ 314 0, /* rightshift */ 315 1, /* size */ 316 4, /* bitsize */ 317 false, /* pc_relative */ 318 0, /* bitpos */ 319 complain_overflow_bitfield,/* complain_on_overflow */ 320 bfd_elf_generic_reloc, /* special_function */ 321 "R_CR16_IMM4", /* name */ 322 false, /* partial_inplace */ 323 0x0, /* src_mask */ 324 0xf, /* dst_mask */ 325 false), /* pcrel_offset */ 326 327 HOWTO (R_CR16_IMM8, /* type */ 328 0, /* rightshift */ 329 1, /* size */ 330 8, /* bitsize */ 331 false, /* pc_relative */ 332 0, /* bitpos */ 333 complain_overflow_bitfield,/* complain_on_overflow */ 334 bfd_elf_generic_reloc, /* special_function */ 335 "R_CR16_IMM8", /* name */ 336 false, /* partial_inplace */ 337 0x0, /* src_mask */ 338 0xff, /* dst_mask */ 339 false), /* pcrel_offset */ 340 341 HOWTO (R_CR16_IMM16, /* type */ 342 0, /* rightshift */ 343 2, /* size */ 344 16, /* bitsize */ 345 false, /* pc_relative */ 346 0, /* bitpos */ 347 complain_overflow_bitfield,/* complain_on_overflow */ 348 bfd_elf_generic_reloc, /* special_function */ 349 "R_CR16_IMM16", /* name */ 350 false, /* partial_inplace */ 351 0x0, /* src_mask */ 352 0xffff, /* dst_mask */ 353 false), /* pcrel_offset */ 354 355 HOWTO (R_CR16_IMM20, /* type */ 356 0, /* rightshift */ 357 4, /* size */ 358 20, /* bitsize */ 359 false, /* pc_relative */ 360 0, /* bitpos */ 361 complain_overflow_bitfield,/* complain_on_overflow */ 362 bfd_elf_generic_reloc, /* special_function */ 363 "R_CR16_IMM20", /* name */ 364 false, /* partial_inplace */ 365 0x0, /* src_mask */ 366 0xfffff, /* dst_mask */ 367 false), /* pcrel_offset */ 368 369 HOWTO (R_CR16_IMM24, /* type */ 370 0, /* rightshift */ 371 4, /* size */ 372 24, /* bitsize */ 373 false, /* pc_relative */ 374 0, /* bitpos */ 375 complain_overflow_bitfield,/* complain_on_overflow */ 376 bfd_elf_generic_reloc, /* special_function */ 377 "R_CR16_IMM24", /* name */ 378 false, /* partial_inplace */ 379 0x0, /* src_mask */ 380 0xffffff, /* dst_mask */ 381 false), /* pcrel_offset */ 382 383 HOWTO (R_CR16_IMM32, /* type */ 384 0, /* rightshift */ 385 4, /* size */ 386 32, /* bitsize */ 387 false, /* pc_relative */ 388 0, /* bitpos */ 389 complain_overflow_bitfield,/* complain_on_overflow */ 390 bfd_elf_generic_reloc, /* special_function */ 391 "R_CR16_IMM32", /* name */ 392 false, /* partial_inplace */ 393 0x0, /* src_mask */ 394 0xffffffff, /* dst_mask */ 395 false), /* pcrel_offset */ 396 397 HOWTO (R_CR16_IMM32a, /* type */ 398 1, /* rightshift */ 399 4, /* size */ 400 32, /* bitsize */ 401 false, /* pc_relative */ 402 0, /* bitpos */ 403 complain_overflow_bitfield,/* complain_on_overflow */ 404 bfd_elf_generic_reloc, /* special_function */ 405 "R_CR16_IMM32a", /* name */ 406 false, /* partial_inplace */ 407 0x0, /* src_mask */ 408 0xffffffff, /* dst_mask */ 409 false), /* pcrel_offset */ 410 411 HOWTO (R_CR16_DISP4, /* type */ 412 1, /* rightshift */ 413 1, /* size */ 414 4, /* bitsize */ 415 true, /* pc_relative */ 416 0, /* bitpos */ 417 complain_overflow_unsigned, /* complain_on_overflow */ 418 bfd_elf_generic_reloc, /* special_function */ 419 "R_CR16_DISP4", /* name */ 420 false, /* partial_inplace */ 421 0x0, /* src_mask */ 422 0xf, /* dst_mask */ 423 false), /* pcrel_offset */ 424 425 HOWTO (R_CR16_DISP8, /* type */ 426 1, /* rightshift */ 427 1, /* size */ 428 8, /* bitsize */ 429 true, /* pc_relative */ 430 0, /* bitpos */ 431 complain_overflow_unsigned, /* complain_on_overflow */ 432 bfd_elf_generic_reloc, /* special_function */ 433 "R_CR16_DISP8", /* name */ 434 false, /* partial_inplace */ 435 0x0, /* src_mask */ 436 0x1ff, /* dst_mask */ 437 false), /* pcrel_offset */ 438 439 HOWTO (R_CR16_DISP16, /* type */ 440 0, /* rightshift REVIITS: To sync with WinIDEA*/ 441 2, /* size */ 442 16, /* bitsize */ 443 true, /* pc_relative */ 444 0, /* bitpos */ 445 complain_overflow_unsigned, /* complain_on_overflow */ 446 bfd_elf_generic_reloc, /* special_function */ 447 "R_CR16_DISP16", /* name */ 448 false, /* partial_inplace */ 449 0x0, /* src_mask */ 450 0x1ffff, /* dst_mask */ 451 false), /* pcrel_offset */ 452 /* REVISIT: DISP24 should be left-shift by 2 as per ISA doc 453 but its not done, to sync with WinIDEA and CR16 4.1 tools */ 454 HOWTO (R_CR16_DISP24, /* type */ 455 0, /* rightshift */ 456 4, /* size */ 457 24, /* bitsize */ 458 true, /* pc_relative */ 459 0, /* bitpos */ 460 complain_overflow_unsigned, /* complain_on_overflow */ 461 bfd_elf_generic_reloc, /* special_function */ 462 "R_CR16_DISP24", /* name */ 463 false, /* partial_inplace */ 464 0x0, /* src_mask */ 465 0x1ffffff, /* dst_mask */ 466 false), /* pcrel_offset */ 467 468 HOWTO (R_CR16_DISP24a, /* type */ 469 0, /* rightshift */ 470 4, /* size */ 471 24, /* bitsize */ 472 true, /* pc_relative */ 473 0, /* bitpos */ 474 complain_overflow_unsigned, /* complain_on_overflow */ 475 bfd_elf_generic_reloc, /* special_function */ 476 "R_CR16_DISP24a", /* name */ 477 false, /* partial_inplace */ 478 0x0, /* src_mask */ 479 0xffffff, /* dst_mask */ 480 false), /* pcrel_offset */ 481 482 /* An 8 bit switch table entry. This is generated for an expression 483 such as ``.byte L1 - L2''. The offset holds the difference 484 between the reloc address and L2. */ 485 HOWTO (R_CR16_SWITCH8, /* type */ 486 0, /* rightshift */ 487 1, /* size */ 488 8, /* bitsize */ 489 false, /* pc_relative */ 490 0, /* bitpos */ 491 complain_overflow_unsigned, /* complain_on_overflow */ 492 bfd_elf_generic_reloc, /* special_function */ 493 "R_CR16_SWITCH8", /* name */ 494 false, /* partial_inplace */ 495 0x0, /* src_mask */ 496 0xff, /* dst_mask */ 497 true), /* pcrel_offset */ 498 499 /* A 16 bit switch table entry. This is generated for an expression 500 such as ``.word L1 - L2''. The offset holds the difference 501 between the reloc address and L2. */ 502 HOWTO (R_CR16_SWITCH16, /* type */ 503 0, /* rightshift */ 504 2, /* size */ 505 16, /* bitsize */ 506 false, /* pc_relative */ 507 0, /* bitpos */ 508 complain_overflow_unsigned, /* complain_on_overflow */ 509 bfd_elf_generic_reloc, /* special_function */ 510 "R_CR16_SWITCH16", /* name */ 511 false, /* partial_inplace */ 512 0x0, /* src_mask */ 513 0xffff, /* dst_mask */ 514 true), /* pcrel_offset */ 515 516 /* A 32 bit switch table entry. This is generated for an expression 517 such as ``.long L1 - L2''. The offset holds the difference 518 between the reloc address and L2. */ 519 HOWTO (R_CR16_SWITCH32, /* type */ 520 0, /* rightshift */ 521 4, /* size */ 522 32, /* bitsize */ 523 false, /* pc_relative */ 524 0, /* bitpos */ 525 complain_overflow_unsigned, /* complain_on_overflow */ 526 bfd_elf_generic_reloc, /* special_function */ 527 "R_CR16_SWITCH32", /* name */ 528 false, /* partial_inplace */ 529 0x0, /* src_mask */ 530 0xffffffff, /* dst_mask */ 531 true), /* pcrel_offset */ 532 533 HOWTO (R_CR16_GOT_REGREL20, /* type */ 534 0, /* rightshift */ 535 4, /* size */ 536 20, /* bitsize */ 537 false, /* pc_relative */ 538 0, /* bitpos */ 539 complain_overflow_bitfield,/* complain_on_overflow */ 540 bfd_elf_generic_reloc, /* special_function */ 541 "R_CR16_GOT_REGREL20", /* name */ 542 true, /* partial_inplace */ 543 0x0, /* src_mask */ 544 0xfffff, /* dst_mask */ 545 false), /* pcrel_offset */ 546 547 HOWTO (R_CR16_GOTC_REGREL20, /* type */ 548 0, /* rightshift */ 549 4, /* size */ 550 20, /* bitsize */ 551 false, /* pc_relative */ 552 0, /* bitpos */ 553 complain_overflow_bitfield,/* complain_on_overflow */ 554 bfd_elf_generic_reloc, /* special_function */ 555 "R_CR16_GOTC_REGREL20", /* name */ 556 true, /* partial_inplace */ 557 0x0, /* src_mask */ 558 0xfffff, /* dst_mask */ 559 false), /* pcrel_offset */ 560 561 HOWTO (R_CR16_GLOB_DAT, /* type */ 562 0, /* rightshift */ 563 4, /* size */ 564 32, /* bitsize */ 565 false, /* pc_relative */ 566 0, /* bitpos */ 567 complain_overflow_unsigned, /* complain_on_overflow */ 568 bfd_elf_generic_reloc, /* special_function */ 569 "R_CR16_GLOB_DAT", /* name */ 570 false, /* partial_inplace */ 571 0x0, /* src_mask */ 572 0xffffffff, /* dst_mask */ 573 true) /* pcrel_offset */ 574 }; 575 576 577 /* Create the GOT section. */ 578 579 static bool 580 _bfd_cr16_elf_create_got_section (bfd * abfd, struct bfd_link_info * info) 581 { 582 flagword flags; 583 asection * s; 584 struct elf_link_hash_entry * h; 585 const struct elf_backend_data * bed = get_elf_backend_data (abfd); 586 struct elf_link_hash_table *htab = elf_hash_table (info); 587 int ptralign; 588 589 /* This function may be called more than once. */ 590 if (htab->sgot != NULL) 591 return true; 592 593 switch (bed->s->arch_size) 594 { 595 case 16: 596 ptralign = 1; 597 break; 598 599 case 32: 600 ptralign = 2; 601 break; 602 603 default: 604 bfd_set_error (bfd_error_bad_value); 605 return false; 606 } 607 608 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 609 | SEC_LINKER_CREATED); 610 611 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags); 612 htab->sgot= s; 613 if (s == NULL 614 || !bfd_set_section_alignment (s, ptralign)) 615 return false; 616 617 if (bed->want_got_plt) 618 { 619 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags); 620 htab->sgotplt = s; 621 if (s == NULL 622 || !bfd_set_section_alignment (s, ptralign)) 623 return false; 624 } 625 626 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got 627 (or .got.plt) section. We don't do this in the linker script 628 because we don't want to define the symbol if we are not creating 629 a global offset table. */ 630 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_"); 631 htab->hgot = h; 632 if (h == NULL) 633 return false; 634 635 /* The first bit of the global offset table is the header. */ 636 s->size += bed->got_header_size; 637 638 return true; 639 } 640 641 642 /* Retrieve a howto ptr using a BFD reloc_code. */ 643 644 static reloc_howto_type * 645 elf_cr16_reloc_type_lookup (bfd *abfd, 646 bfd_reloc_code_real_type code) 647 { 648 unsigned int i; 649 650 for (i = 0; i < R_CR16_MAX; i++) 651 if (code == cr16_reloc_map[i].bfd_reloc_enum) 652 return &cr16_elf_howto_table[cr16_reloc_map[i].cr16_reloc_type]; 653 654 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 655 abfd, code); 656 return NULL; 657 } 658 659 static reloc_howto_type * 660 elf_cr16_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 661 const char *r_name) 662 { 663 unsigned int i; 664 665 for (i = 0; ARRAY_SIZE (cr16_elf_howto_table); i++) 666 if (cr16_elf_howto_table[i].name != NULL 667 && strcasecmp (cr16_elf_howto_table[i].name, r_name) == 0) 668 return cr16_elf_howto_table + i; 669 670 return NULL; 671 } 672 673 /* Retrieve a howto ptr using an internal relocation entry. */ 674 675 static bool 676 elf_cr16_info_to_howto (bfd *abfd, arelent *cache_ptr, 677 Elf_Internal_Rela *dst) 678 { 679 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 680 681 if (r_type >= R_CR16_MAX) 682 { 683 /* xgettext:c-format */ 684 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 685 abfd, r_type); 686 bfd_set_error (bfd_error_bad_value); 687 return false; 688 } 689 cache_ptr->howto = cr16_elf_howto_table + r_type; 690 return true; 691 } 692 693 /* Look through the relocs for a section during the first phase. 694 Since we don't do .gots or .plts, we just need to consider the 695 virtual table relocs for gc. */ 696 697 static bool 698 cr16_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, 699 const Elf_Internal_Rela *relocs) 700 { 701 Elf_Internal_Shdr *symtab_hdr; 702 Elf_Internal_Sym * isymbuf = NULL; 703 struct elf_link_hash_entry **sym_hashes; 704 const Elf_Internal_Rela *rel; 705 const Elf_Internal_Rela *rel_end; 706 bfd * dynobj; 707 bfd_vma * local_got_offsets; 708 asection * sgot; 709 asection * srelgot; 710 711 sgot = NULL; 712 srelgot = NULL; 713 bool result = false; 714 715 if (bfd_link_relocatable (info)) 716 return true; 717 718 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 719 sym_hashes = elf_sym_hashes (abfd); 720 721 dynobj = elf_hash_table (info)->dynobj; 722 local_got_offsets = elf_local_got_offsets (abfd); 723 rel_end = relocs + sec->reloc_count; 724 for (rel = relocs; rel < rel_end; rel++) 725 { 726 struct elf_link_hash_entry *h; 727 unsigned long r_symndx; 728 729 r_symndx = ELF32_R_SYM (rel->r_info); 730 if (r_symndx < symtab_hdr->sh_info) 731 h = NULL; 732 else 733 { 734 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 735 while (h->root.type == bfd_link_hash_indirect 736 || h->root.type == bfd_link_hash_warning) 737 h = (struct elf_link_hash_entry *) h->root.u.i.link; 738 } 739 740 /* Some relocs require a global offset table. */ 741 if (dynobj == NULL) 742 { 743 switch (ELF32_R_TYPE (rel->r_info)) 744 { 745 case R_CR16_GOT_REGREL20: 746 case R_CR16_GOTC_REGREL20: 747 elf_hash_table (info)->dynobj = dynobj = abfd; 748 if (! _bfd_cr16_elf_create_got_section (dynobj, info)) 749 goto fail; 750 break; 751 752 default: 753 break; 754 } 755 } 756 757 switch (ELF32_R_TYPE (rel->r_info)) 758 { 759 case R_CR16_GOT_REGREL20: 760 case R_CR16_GOTC_REGREL20: 761 /* This symbol requires a global offset table entry. */ 762 763 sgot = elf_hash_table (info)->sgot; 764 srelgot = elf_hash_table (info)->srelgot; 765 BFD_ASSERT (sgot != NULL && srelgot != NULL); 766 767 if (h != NULL) 768 { 769 if (h->got.offset != (bfd_vma) -1) 770 /* We have already allocated space in the .got. */ 771 break; 772 773 h->got.offset = sgot->size; 774 775 /* Make sure this symbol is output as a dynamic symbol. */ 776 if (h->dynindx == -1) 777 { 778 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 779 goto fail; 780 } 781 782 srelgot->size += sizeof (Elf32_External_Rela); 783 } 784 else 785 { 786 /* This is a global offset table entry for a local 787 symbol. */ 788 if (local_got_offsets == NULL) 789 { 790 size_t size; 791 unsigned int i; 792 793 size = symtab_hdr->sh_info * sizeof (bfd_vma); 794 local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); 795 796 if (local_got_offsets == NULL) 797 goto fail; 798 799 elf_local_got_offsets (abfd) = local_got_offsets; 800 801 for (i = 0; i < symtab_hdr->sh_info; i++) 802 local_got_offsets[i] = (bfd_vma) -1; 803 } 804 805 if (local_got_offsets[r_symndx] != (bfd_vma) -1) 806 /* We have already allocated space in the .got. */ 807 break; 808 809 local_got_offsets[r_symndx] = sgot->size; 810 811 if (bfd_link_executable (info)) 812 /* If we are generating a shared object, we need to 813 output a R_CR16_RELATIVE reloc so that the dynamic 814 linker can adjust this GOT entry. */ 815 srelgot->size += sizeof (Elf32_External_Rela); 816 } 817 818 sgot->size += 4; 819 break; 820 821 } 822 } 823 824 result = true; 825 fail: 826 free (isymbuf); 827 828 return result; 829 } 830 831 /* Perform a relocation as part of a final link. */ 832 833 static bfd_reloc_status_type 834 cr16_elf_final_link_relocate (reloc_howto_type *howto, 835 bfd *input_bfd, 836 bfd *output_bfd ATTRIBUTE_UNUSED, 837 asection *input_section, 838 bfd_byte *contents, 839 bfd_vma offset, 840 bfd_vma Rvalue, 841 bfd_vma addend, 842 struct elf_link_hash_entry * h, 843 unsigned long symndx ATTRIBUTE_UNUSED, 844 struct bfd_link_info *info ATTRIBUTE_UNUSED, 845 asection *sec ATTRIBUTE_UNUSED, 846 int is_local ATTRIBUTE_UNUSED) 847 { 848 unsigned short r_type = howto->type; 849 bfd_byte *hit_data = contents + offset; 850 bfd_vma reloc_bits, check, Rvalue1; 851 852 switch (r_type) 853 { 854 case R_CR16_IMM4: 855 case R_CR16_IMM20: 856 case R_CR16_ABS20: 857 break; 858 859 case R_CR16_IMM8: 860 case R_CR16_IMM16: 861 case R_CR16_IMM32: 862 case R_CR16_IMM32a: 863 case R_CR16_REGREL4: 864 case R_CR16_REGREL4a: 865 case R_CR16_REGREL14: 866 case R_CR16_REGREL14a: 867 case R_CR16_REGREL16: 868 case R_CR16_REGREL20: 869 case R_CR16_REGREL20a: 870 case R_CR16_GOT_REGREL20: 871 case R_CR16_GOTC_REGREL20: 872 case R_CR16_ABS24: 873 case R_CR16_DISP16: 874 case R_CR16_DISP24: 875 /* 'hit_data' is relative to the start of the instruction, not the 876 relocation offset. Advance it to account for the exact offset. */ 877 hit_data += 2; 878 break; 879 880 case R_CR16_NONE: 881 return bfd_reloc_ok; 882 break; 883 884 case R_CR16_DISP4: 885 if (is_local) 886 Rvalue += -1; 887 break; 888 889 case R_CR16_DISP8: 890 case R_CR16_DISP24a: 891 if (is_local) 892 Rvalue -= -1; 893 break; 894 895 case R_CR16_SWITCH8: 896 case R_CR16_SWITCH16: 897 case R_CR16_SWITCH32: 898 /* We only care about the addend, where the difference between 899 expressions is kept. */ 900 Rvalue = 0; 901 902 default: 903 break; 904 } 905 906 if (howto->pc_relative) 907 { 908 /* Subtract the address of the section containing the location. */ 909 Rvalue -= (input_section->output_section->vma 910 + input_section->output_offset); 911 /* Subtract the position of the location within the section. */ 912 Rvalue -= offset; 913 } 914 915 /* Add in supplied addend. */ 916 Rvalue += addend; 917 918 /* Complain if the bitfield overflows, whether it is considered 919 as signed or unsigned. */ 920 check = Rvalue >> howto->rightshift; 921 922 reloc_bits = ((bfd_vma) 1 << (howto->bitsize - 1) << 1) - 1; 923 924 /* For GOT and GOTC relocs no boundary checks applied. */ 925 if (!((r_type == R_CR16_GOT_REGREL20) 926 || (r_type == R_CR16_GOTC_REGREL20))) 927 { 928 if (((bfd_vma) check & ~reloc_bits) != 0 929 && (((bfd_vma) check & ~reloc_bits) 930 != (-(bfd_vma) 1 & ~reloc_bits))) 931 { 932 /* The above right shift is incorrect for a signed 933 value. See if turning on the upper bits fixes the 934 overflow. */ 935 if (howto->rightshift && (bfd_signed_vma) Rvalue < 0) 936 { 937 check |= ((bfd_vma) -1 938 & ~((bfd_vma) -1 >> howto->rightshift)); 939 940 if (((bfd_vma) check & ~reloc_bits) 941 != (-(bfd_vma) 1 & ~reloc_bits)) 942 return bfd_reloc_overflow; 943 } 944 else 945 return bfd_reloc_overflow; 946 } 947 948 /* Drop unwanted bits from the value we are relocating to. */ 949 Rvalue >>= (bfd_vma) howto->rightshift; 950 951 /* Apply dst_mask to select only relocatable part of the insn. */ 952 Rvalue &= howto->dst_mask; 953 } 954 955 switch (bfd_get_reloc_size (howto)) 956 { 957 case 1: 958 if (r_type == R_CR16_DISP8) 959 { 960 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 961 Rvalue = ((Rvalue1 & 0xf000) | ((Rvalue << 4) & 0xf00) 962 | (Rvalue1 & 0x00f0) | (Rvalue & 0xf)); 963 bfd_put_16 (input_bfd, Rvalue, hit_data); 964 } 965 else if (r_type == R_CR16_IMM4) 966 { 967 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 968 Rvalue = (((Rvalue1 & 0xff) << 8) | ((Rvalue << 4) & 0xf0) 969 | ((Rvalue1 & 0x0f00) >> 8)); 970 bfd_put_16 (input_bfd, Rvalue, hit_data); 971 } 972 else if (r_type == R_CR16_DISP4) 973 { 974 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 975 Rvalue = (Rvalue1 | ((Rvalue & 0xf) << 4)); 976 bfd_put_16 (input_bfd, Rvalue, hit_data); 977 } 978 else 979 { 980 bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data); 981 } 982 break; 983 984 case 2: 985 if (r_type == R_CR16_DISP16) 986 { 987 Rvalue |= (bfd_get_16 (input_bfd, hit_data)); 988 Rvalue = ((Rvalue & 0xfffe) | ((Rvalue >> 16) & 0x1)); 989 } 990 if (r_type == R_CR16_IMM16) 991 { 992 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 993 994 Rvalue1 = (Rvalue1 ^ 0x8000) - 0x8000; 995 Rvalue += Rvalue1; 996 997 /* Check for range. */ 998 if (Rvalue > 0xffff) 999 return bfd_reloc_overflow; 1000 } 1001 1002 bfd_put_16 (input_bfd, Rvalue, hit_data); 1003 break; 1004 1005 case 4: 1006 if ((r_type == R_CR16_ABS20) || (r_type == R_CR16_IMM20)) 1007 { 1008 Rvalue1 = (bfd_get_16 (input_bfd, hit_data + 2) 1009 | (((bfd_get_16 (input_bfd, hit_data) & 0xf) << 16))); 1010 1011 Rvalue1 = (Rvalue1 ^ 0x80000) - 0x80000; 1012 Rvalue += Rvalue1; 1013 1014 /* Check for range. */ 1015 if (Rvalue > 0xfffff) 1016 return bfd_reloc_overflow; 1017 1018 bfd_put_16 (input_bfd, ((bfd_get_16 (input_bfd, hit_data) & 0xfff0) 1019 | ((Rvalue >> 16) & 0xf)), hit_data); 1020 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1021 } 1022 else if (r_type == R_CR16_GOT_REGREL20) 1023 { 1024 asection *sgot = elf_hash_table (info)->sgot; 1025 bfd_vma off; 1026 1027 if (h != NULL) 1028 { 1029 off = h->got.offset; 1030 BFD_ASSERT (off != (bfd_vma) -1); 1031 1032 if (! elf_hash_table (info)->dynamic_sections_created 1033 || SYMBOL_REFERENCES_LOCAL (info, h)) 1034 /* This is actually a static link, or it is a 1035 -Bsymbolic link and the symbol is defined 1036 locally, or the symbol was forced to be local 1037 because of a version file. We must initialize 1038 this entry in the global offset table. 1039 When doing a dynamic link, we create a .rela.got 1040 relocation entry to initialize the value. This 1041 is done in the finish_dynamic_symbol routine. */ 1042 bfd_put_32 (output_bfd, Rvalue, sgot->contents + off); 1043 } 1044 else 1045 { 1046 off = elf_local_got_offsets (input_bfd)[symndx]; 1047 bfd_put_32 (output_bfd, Rvalue, sgot->contents + off); 1048 } 1049 1050 Rvalue = sgot->output_offset + off; 1051 Rvalue += addend; 1052 1053 /* REVISIT: if ((long) Rvalue > 0xffffff || 1054 (long) Rvalue < -0x800000). */ 1055 if (Rvalue > 0xffffff) 1056 return bfd_reloc_overflow; 1057 1058 1059 bfd_put_16 (input_bfd, (bfd_get_16 (input_bfd, hit_data)) 1060 | (((Rvalue >> 16) & 0xf) << 8), hit_data); 1061 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1062 1063 } 1064 else if (r_type == R_CR16_GOTC_REGREL20) 1065 { 1066 asection *sgot = elf_hash_table (info)->sgot; 1067 bfd_vma off; 1068 1069 if (h != NULL) 1070 { 1071 off = h->got.offset; 1072 BFD_ASSERT (off != (bfd_vma) -1); 1073 1074 Rvalue >>= 1; /* For code symbols. */ 1075 1076 if (! elf_hash_table (info)->dynamic_sections_created 1077 || SYMBOL_REFERENCES_LOCAL (info, h)) 1078 /* This is actually a static link, or it is a 1079 -Bsymbolic link and the symbol is defined 1080 locally, or the symbol was forced to be local 1081 because of a version file. We must initialize 1082 this entry in the global offset table. 1083 When doing a dynamic link, we create a .rela.got 1084 relocation entry to initialize the value. This 1085 is done in the finish_dynamic_symbol routine. */ 1086 bfd_put_32 (output_bfd, Rvalue, sgot->contents + off); 1087 } 1088 else 1089 { 1090 off = elf_local_got_offsets (input_bfd)[symndx]; 1091 Rvalue >>= 1; 1092 bfd_put_32 (output_bfd, Rvalue, sgot->contents + off); 1093 } 1094 1095 Rvalue = sgot->output_offset + off; 1096 Rvalue += addend; 1097 1098 /* Check if any value in DISP. */ 1099 Rvalue1 = bfd_get_32 (input_bfd, hit_data); 1100 Rvalue1 = ((Rvalue1 >> 16) | ((Rvalue1 & 0xfff) >> 8 << 16)); 1101 1102 Rvalue1 = (Rvalue1 ^ 0x80000) - 0x80000; 1103 Rvalue += Rvalue1; 1104 1105 /* Check for range. */ 1106 /* REVISIT: if ((long) Rvalue > 0xffffff 1107 || (long) Rvalue < -0x800000). */ 1108 if (Rvalue > 0xffffff) 1109 return bfd_reloc_overflow; 1110 1111 bfd_put_16 (input_bfd, (bfd_get_16 (input_bfd, hit_data)) 1112 | (((Rvalue >> 16) & 0xf) << 8), hit_data); 1113 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1114 } 1115 else 1116 { 1117 if (r_type == R_CR16_ABS24) 1118 { 1119 Rvalue1 = bfd_get_32 (input_bfd, hit_data); 1120 Rvalue1 = ((Rvalue1 >> 16) 1121 | ((Rvalue1 & 0xfff) >> 8 << 16) 1122 | ((Rvalue1 & 0xf) << 20)); 1123 1124 Rvalue1 = (Rvalue1 ^ 0x800000) - 0x800000; 1125 Rvalue += Rvalue1; 1126 1127 /* Check for Range. */ 1128 if (Rvalue > 0xffffff) 1129 return bfd_reloc_overflow; 1130 1131 Rvalue = ((((Rvalue >> 20) & 0xf) | (((Rvalue >> 16) & 0xf)<<8) 1132 | (bfd_get_32 (input_bfd, hit_data) & 0xf0f0)) 1133 | ((Rvalue & 0xffff) << 16)); 1134 } 1135 else if (r_type == R_CR16_DISP24) 1136 { 1137 Rvalue = ((((Rvalue >> 20)& 0xf) | (((Rvalue >>16) & 0xf)<<8) 1138 | (bfd_get_16 (input_bfd, hit_data))) 1139 | (((Rvalue & 0xfffe) | ((Rvalue >> 24) & 0x1)) << 16)); 1140 } 1141 else if ((r_type == R_CR16_IMM32) || (r_type == R_CR16_IMM32a)) 1142 { 1143 Rvalue1 = bfd_get_32 (input_bfd, hit_data); 1144 Rvalue1 = (((Rvalue1 >> 16) & 0xffff) 1145 | ((Rvalue1 & 0xffff) << 16)); 1146 1147 Rvalue1 = (Rvalue1 ^ 0x80000000) - 0x80000000; 1148 Rvalue += Rvalue1; 1149 1150 /* Check for range. */ 1151 if (Rvalue > 0xffffffff) 1152 return bfd_reloc_overflow; 1153 1154 Rvalue = (((Rvalue >> 16) & 0xffff) | (Rvalue & 0xffff) << 16); 1155 } 1156 else if (r_type == R_CR16_DISP24a) 1157 { 1158 Rvalue = (((Rvalue & 0xfffffe) | (Rvalue >> 23))); 1159 Rvalue = (((Rvalue >> 16) & 0xff) | ((Rvalue & 0xffff) << 16) 1160 | bfd_get_32 (input_bfd, hit_data)); 1161 } 1162 else if ((r_type == R_CR16_REGREL20) 1163 || (r_type == R_CR16_REGREL20a)) 1164 { 1165 Rvalue1 = bfd_get_32 (input_bfd, hit_data); 1166 Rvalue1 = (((Rvalue1 >> 16) & 0xffff) 1167 | ((Rvalue1 & 0xfff) >> 8 << 16)); 1168 1169 Rvalue1 = (Rvalue1 ^ 0x80000) - 0x80000; 1170 Rvalue += Rvalue1; 1171 1172 /* Check for range. */ 1173 if (Rvalue > 0xfffff) 1174 return bfd_reloc_overflow; 1175 1176 Rvalue = (((((Rvalue >> 20) & 0xf) | (((Rvalue >> 16) & 0xf) << 8) 1177 | ((Rvalue & 0xffff) << 16))) 1178 | (bfd_get_32 (input_bfd, hit_data) & 0xf0ff)); 1179 1180 } 1181 else if (r_type == R_CR16_NUM32) 1182 { 1183 Rvalue1 = (bfd_get_32 (input_bfd, hit_data)); 1184 1185 Rvalue1 = (Rvalue1 ^ 0x80000000) - 0x80000000; 1186 Rvalue += Rvalue1; 1187 1188 /* Check for Range. */ 1189 if (Rvalue > 0xffffffff) 1190 return bfd_reloc_overflow; 1191 } 1192 1193 bfd_put_32 (input_bfd, Rvalue, hit_data); 1194 } 1195 break; 1196 1197 default: 1198 return bfd_reloc_notsupported; 1199 } 1200 1201 return bfd_reloc_ok; 1202 } 1203 1204 /* Delete some bytes from a section while relaxing. */ 1205 1206 static bool 1207 elf32_cr16_relax_delete_bytes (struct bfd_link_info *link_info, bfd *abfd, 1208 asection *sec, bfd_vma addr, int count) 1209 { 1210 Elf_Internal_Shdr *symtab_hdr; 1211 unsigned int sec_shndx; 1212 bfd_byte *contents; 1213 Elf_Internal_Rela *irel, *irelend; 1214 bfd_vma toaddr; 1215 Elf_Internal_Sym *isym; 1216 Elf_Internal_Sym *isymend; 1217 struct elf_link_hash_entry **sym_hashes; 1218 struct elf_link_hash_entry **end_hashes; 1219 struct elf_link_hash_entry **start_hashes; 1220 unsigned int symcount; 1221 1222 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); 1223 1224 contents = elf_section_data (sec)->this_hdr.contents; 1225 1226 toaddr = sec->size; 1227 1228 irel = elf_section_data (sec)->relocs; 1229 irelend = irel + sec->reloc_count; 1230 1231 /* Actually delete the bytes. */ 1232 memmove (contents + addr, contents + addr + count, 1233 (size_t) (toaddr - addr - count)); 1234 sec->size -= count; 1235 1236 /* Adjust all the relocs. */ 1237 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) 1238 /* Get the new reloc address. */ 1239 if ((irel->r_offset > addr && irel->r_offset < toaddr)) 1240 irel->r_offset -= count; 1241 1242 /* Adjust the local symbols defined in this section. */ 1243 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1244 isym = (Elf_Internal_Sym *) symtab_hdr->contents; 1245 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) 1246 { 1247 if (isym->st_shndx == sec_shndx 1248 && isym->st_value > addr 1249 && isym->st_value < toaddr) 1250 { 1251 /* Adjust the addend of SWITCH relocations in this section, 1252 which reference this local symbol. */ 1253 #if 0 1254 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) 1255 { 1256 unsigned long r_symndx; 1257 Elf_Internal_Sym *rsym; 1258 bfd_vma addsym, subsym; 1259 1260 /* Skip if not a SWITCH relocation. */ 1261 if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH8 1262 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH16 1263 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH32) 1264 continue; 1265 1266 r_symndx = ELF32_R_SYM (irel->r_info); 1267 rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx; 1268 1269 /* Skip if not the local adjusted symbol. */ 1270 if (rsym != isym) 1271 continue; 1272 1273 addsym = isym->st_value; 1274 subsym = addsym - irel->r_addend; 1275 1276 /* Fix the addend only when -->> (addsym > addr >= subsym). */ 1277 if (subsym <= addr) 1278 irel->r_addend -= count; 1279 else 1280 continue; 1281 } 1282 #endif 1283 1284 isym->st_value -= count; 1285 } 1286 } 1287 1288 /* Now adjust the global symbols defined in this section. */ 1289 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) 1290 - symtab_hdr->sh_info); 1291 sym_hashes = start_hashes = elf_sym_hashes (abfd); 1292 end_hashes = sym_hashes + symcount; 1293 1294 for (; sym_hashes < end_hashes; sym_hashes++) 1295 { 1296 struct elf_link_hash_entry *sym_hash = *sym_hashes; 1297 1298 /* The '--wrap SYMBOL' option is causing a pain when the object file, 1299 containing the definition of __wrap_SYMBOL, includes a direct 1300 call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference 1301 the same symbol (which is __wrap_SYMBOL), but still exist as two 1302 different symbols in 'sym_hashes', we don't want to adjust 1303 the global symbol __wrap_SYMBOL twice. 1304 This check is only relevant when symbols are being wrapped. */ 1305 if (link_info->wrap_hash != NULL) 1306 { 1307 struct elf_link_hash_entry **cur_sym_hashes; 1308 1309 /* Loop only over the symbols whom been already checked. */ 1310 for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes; 1311 cur_sym_hashes++) 1312 /* If the current symbol is identical to 'sym_hash', that means 1313 the symbol was already adjusted (or at least checked). */ 1314 if (*cur_sym_hashes == sym_hash) 1315 break; 1316 1317 /* Don't adjust the symbol again. */ 1318 if (cur_sym_hashes < sym_hashes) 1319 continue; 1320 } 1321 1322 if ((sym_hash->root.type == bfd_link_hash_defined 1323 || sym_hash->root.type == bfd_link_hash_defweak) 1324 && sym_hash->root.u.def.section == sec 1325 && sym_hash->root.u.def.value > addr 1326 && sym_hash->root.u.def.value < toaddr) 1327 sym_hash->root.u.def.value -= count; 1328 } 1329 1330 return true; 1331 } 1332 1333 /* Relocate a CR16 ELF section. */ 1334 1335 static int 1336 elf32_cr16_relocate_section (bfd *output_bfd, struct bfd_link_info *info, 1337 bfd *input_bfd, asection *input_section, 1338 bfd_byte *contents, Elf_Internal_Rela *relocs, 1339 Elf_Internal_Sym *local_syms, 1340 asection **local_sections) 1341 { 1342 Elf_Internal_Shdr *symtab_hdr; 1343 struct elf_link_hash_entry **sym_hashes; 1344 Elf_Internal_Rela *rel, *relend; 1345 1346 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1347 sym_hashes = elf_sym_hashes (input_bfd); 1348 1349 rel = relocs; 1350 relend = relocs + input_section->reloc_count; 1351 for (; rel < relend; rel++) 1352 { 1353 int r_type; 1354 reloc_howto_type *howto; 1355 unsigned long r_symndx; 1356 Elf_Internal_Sym *sym; 1357 asection *sec; 1358 struct elf_link_hash_entry *h; 1359 bfd_vma relocation; 1360 bfd_reloc_status_type r; 1361 1362 r_symndx = ELF32_R_SYM (rel->r_info); 1363 r_type = ELF32_R_TYPE (rel->r_info); 1364 howto = cr16_elf_howto_table + (r_type); 1365 1366 h = NULL; 1367 sym = NULL; 1368 sec = NULL; 1369 if (r_symndx < symtab_hdr->sh_info) 1370 { 1371 sym = local_syms + r_symndx; 1372 sec = local_sections[r_symndx]; 1373 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1374 } 1375 else 1376 { 1377 bool unresolved_reloc, warned, ignored; 1378 1379 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1380 r_symndx, symtab_hdr, sym_hashes, 1381 h, sec, relocation, 1382 unresolved_reloc, warned, ignored); 1383 } 1384 1385 if (sec != NULL && discarded_section (sec)) 1386 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1387 rel, 1, relend, howto, 0, contents); 1388 1389 if (bfd_link_relocatable (info)) 1390 continue; 1391 1392 r = cr16_elf_final_link_relocate (howto, input_bfd, output_bfd, 1393 input_section, 1394 contents, rel->r_offset, 1395 relocation, rel->r_addend, 1396 (struct elf_link_hash_entry *) h, 1397 r_symndx, 1398 info, sec, h == NULL); 1399 1400 if (r != bfd_reloc_ok) 1401 { 1402 const char *name; 1403 const char *msg = NULL; 1404 1405 if (h != NULL) 1406 name = h->root.root.string; 1407 else 1408 { 1409 name = (bfd_elf_string_from_elf_section 1410 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 1411 if (name == NULL || *name == '\0') 1412 name = bfd_section_name (sec); 1413 } 1414 1415 switch (r) 1416 { 1417 case bfd_reloc_overflow: 1418 (*info->callbacks->reloc_overflow) 1419 (info, (h ? &h->root : NULL), name, howto->name, 1420 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1421 break; 1422 1423 case bfd_reloc_undefined: 1424 (*info->callbacks->undefined_symbol) 1425 (info, name, input_bfd, input_section, rel->r_offset, true); 1426 break; 1427 1428 case bfd_reloc_outofrange: 1429 msg = _("internal error: out of range error"); 1430 goto common_error; 1431 1432 case bfd_reloc_notsupported: 1433 msg = _("internal error: unsupported relocation error"); 1434 goto common_error; 1435 1436 case bfd_reloc_dangerous: 1437 msg = _("internal error: dangerous error"); 1438 goto common_error; 1439 1440 default: 1441 msg = _("internal error: unknown error"); 1442 /* Fall through. */ 1443 1444 common_error: 1445 (*info->callbacks->warning) (info, msg, name, input_bfd, 1446 input_section, rel->r_offset); 1447 break; 1448 } 1449 } 1450 } 1451 1452 return true; 1453 } 1454 1455 /* This is a version of bfd_generic_get_relocated_section_contents 1456 which uses elf32_cr16_relocate_section. */ 1457 1458 static bfd_byte * 1459 elf32_cr16_get_relocated_section_contents (bfd *output_bfd, 1460 struct bfd_link_info *link_info, 1461 struct bfd_link_order *link_order, 1462 bfd_byte *data, 1463 bool relocatable, 1464 asymbol **symbols) 1465 { 1466 Elf_Internal_Shdr *symtab_hdr; 1467 asection *input_section = link_order->u.indirect.section; 1468 bfd *input_bfd = input_section->owner; 1469 asection **sections = NULL; 1470 Elf_Internal_Rela *internal_relocs = NULL; 1471 Elf_Internal_Sym *isymbuf = NULL; 1472 1473 /* We only need to handle the case of relaxing, or of having a 1474 particular set of section contents, specially. */ 1475 if (relocatable 1476 || elf_section_data (input_section)->this_hdr.contents == NULL) 1477 return bfd_generic_get_relocated_section_contents (output_bfd, link_info, 1478 link_order, data, 1479 relocatable, 1480 symbols); 1481 1482 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1483 1484 bfd_byte *orig_data = data; 1485 if (data == NULL) 1486 { 1487 data = bfd_malloc (input_section->size); 1488 if (data == NULL) 1489 return NULL; 1490 } 1491 memcpy (data, elf_section_data (input_section)->this_hdr.contents, 1492 (size_t) input_section->size); 1493 1494 if ((input_section->flags & SEC_RELOC) != 0 1495 && input_section->reloc_count > 0) 1496 { 1497 Elf_Internal_Sym *isym; 1498 Elf_Internal_Sym *isymend; 1499 asection **secpp; 1500 bfd_size_type amt; 1501 1502 internal_relocs = _bfd_elf_link_read_relocs (input_bfd, input_section, 1503 NULL, NULL, false); 1504 if (internal_relocs == NULL) 1505 goto error_return; 1506 1507 if (symtab_hdr->sh_info != 0) 1508 { 1509 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1510 if (isymbuf == NULL) 1511 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, 1512 symtab_hdr->sh_info, 0, 1513 NULL, NULL, NULL); 1514 if (isymbuf == NULL) 1515 goto error_return; 1516 } 1517 1518 amt = symtab_hdr->sh_info; 1519 amt *= sizeof (asection *); 1520 sections = bfd_malloc (amt); 1521 if (sections == NULL && amt != 0) 1522 goto error_return; 1523 1524 isymend = isymbuf + symtab_hdr->sh_info; 1525 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) 1526 { 1527 asection *isec; 1528 1529 if (isym->st_shndx == SHN_UNDEF) 1530 isec = bfd_und_section_ptr; 1531 else if (isym->st_shndx == SHN_ABS) 1532 isec = bfd_abs_section_ptr; 1533 else if (isym->st_shndx == SHN_COMMON) 1534 isec = bfd_com_section_ptr; 1535 else 1536 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); 1537 1538 *secpp = isec; 1539 } 1540 1541 if (! elf32_cr16_relocate_section (output_bfd, link_info, input_bfd, 1542 input_section, data, internal_relocs, 1543 isymbuf, sections)) 1544 goto error_return; 1545 1546 free (sections); 1547 if (symtab_hdr->contents != (unsigned char *) isymbuf) 1548 free (isymbuf); 1549 if (elf_section_data (input_section)->relocs != internal_relocs) 1550 free (internal_relocs); 1551 } 1552 1553 return data; 1554 1555 error_return: 1556 free (sections); 1557 if (symtab_hdr->contents != (unsigned char *) isymbuf) 1558 free (isymbuf); 1559 if (elf_section_data (input_section)->relocs != internal_relocs) 1560 free (internal_relocs); 1561 if (orig_data == NULL) 1562 free (data); 1563 return NULL; 1564 } 1565 1566 /* Assorted hash table functions. */ 1567 1568 /* Initialize an entry in the link hash table. */ 1569 1570 /* Create an entry in an CR16 ELF linker hash table. */ 1571 1572 static struct bfd_hash_entry * 1573 elf32_cr16_link_hash_newfunc (struct bfd_hash_entry *entry, 1574 struct bfd_hash_table *table, 1575 const char *string) 1576 { 1577 struct elf32_cr16_link_hash_entry *ret = 1578 (struct elf32_cr16_link_hash_entry *) entry; 1579 1580 /* Allocate the structure if it has not already been allocated by a 1581 subclass. */ 1582 if (ret == (struct elf32_cr16_link_hash_entry *) NULL) 1583 ret = ((struct elf32_cr16_link_hash_entry *) 1584 bfd_hash_allocate (table, 1585 sizeof (struct elf32_cr16_link_hash_entry))); 1586 if (ret == (struct elf32_cr16_link_hash_entry *) NULL) 1587 return (struct bfd_hash_entry *) ret; 1588 1589 /* Call the allocation method of the superclass. */ 1590 ret = ((struct elf32_cr16_link_hash_entry *) 1591 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 1592 table, string)); 1593 if (ret != (struct elf32_cr16_link_hash_entry *) NULL) 1594 { 1595 ret->direct_calls = 0; 1596 ret->stack_size = 0; 1597 ret->movm_args = 0; 1598 ret->movm_stack_size = 0; 1599 ret->flags = 0; 1600 ret->value = 0; 1601 } 1602 1603 return (struct bfd_hash_entry *) ret; 1604 } 1605 1606 /* Create an cr16 ELF linker hash table. */ 1607 1608 static struct bfd_link_hash_table * 1609 elf32_cr16_link_hash_table_create (bfd *abfd) 1610 { 1611 struct elf_link_hash_table *ret; 1612 size_t amt = sizeof (struct elf_link_hash_table); 1613 1614 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt); 1615 if (ret == (struct elf_link_hash_table *) NULL) 1616 return NULL; 1617 1618 if (!_bfd_elf_link_hash_table_init (ret, abfd, 1619 elf32_cr16_link_hash_newfunc, 1620 sizeof (struct elf32_cr16_link_hash_entry), 1621 GENERIC_ELF_DATA)) 1622 { 1623 free (ret); 1624 return NULL; 1625 } 1626 1627 return &ret->root; 1628 } 1629 1630 static unsigned long 1631 elf_cr16_mach (flagword flags) 1632 { 1633 switch (flags) 1634 { 1635 case EM_CR16: 1636 default: 1637 return bfd_mach_cr16; 1638 } 1639 } 1640 1641 /* The final processing done just before writing out a CR16 ELF object 1642 file. This gets the CR16 architecture right based on the machine 1643 number. */ 1644 1645 static bool 1646 _bfd_cr16_elf_final_write_processing (bfd *abfd) 1647 { 1648 unsigned long val; 1649 switch (bfd_get_mach (abfd)) 1650 { 1651 default: 1652 case bfd_mach_cr16: 1653 val = EM_CR16; 1654 break; 1655 } 1656 elf_elfheader (abfd)->e_flags |= val; 1657 return _bfd_elf_final_write_processing (abfd); 1658 } 1659 1660 1661 static bool 1662 _bfd_cr16_elf_object_p (bfd *abfd) 1663 { 1664 bfd_default_set_arch_mach (abfd, bfd_arch_cr16, 1665 elf_cr16_mach (elf_elfheader (abfd)->e_flags)); 1666 return true; 1667 } 1668 1669 /* Merge backend specific data from an object file to the output 1670 object file when linking. */ 1671 1672 static bool 1673 _bfd_cr16_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 1674 { 1675 bfd *obfd = info->output_bfd; 1676 1677 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1678 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1679 return true; 1680 1681 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) 1682 && bfd_get_mach (obfd) < bfd_get_mach (ibfd)) 1683 { 1684 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), 1685 bfd_get_mach (ibfd))) 1686 return false; 1687 } 1688 1689 return true; 1690 } 1691 1692 1693 /* This function handles relaxing for the CR16. 1694 1695 There's quite a few relaxing opportunites available on the CR16: 1696 1697 * bcond:24 -> bcond:16 1 byte 1698 * bcond:16 -> bcond:8 1 byte 1699 * arithmetic imm32 -> arithmetic imm20 12 bits 1700 * arithmetic imm20/imm16 -> arithmetic imm4 12/16 bits 1701 1702 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 1703 1704 static bool 1705 elf32_cr16_relax_section (bfd *abfd, asection *sec, 1706 struct bfd_link_info *link_info, bool *again) 1707 { 1708 Elf_Internal_Shdr *symtab_hdr; 1709 Elf_Internal_Rela *internal_relocs; 1710 Elf_Internal_Rela *irel, *irelend; 1711 bfd_byte *contents = NULL; 1712 Elf_Internal_Sym *isymbuf = NULL; 1713 1714 /* Assume nothing changes. */ 1715 *again = false; 1716 1717 /* We don't have to do anything for a relocatable link, if 1718 this section does not have relocs, or if this is not a 1719 code section. */ 1720 if (bfd_link_relocatable (link_info) 1721 || (sec->flags & SEC_RELOC) == 0 1722 || sec->reloc_count == 0 1723 || (sec->flags & SEC_CODE) == 0) 1724 return true; 1725 1726 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1727 1728 /* Get a copy of the native relocations. */ 1729 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, 1730 link_info->keep_memory); 1731 if (internal_relocs == NULL) 1732 goto error_return; 1733 1734 /* Walk through them looking for relaxing opportunities. */ 1735 irelend = internal_relocs + sec->reloc_count; 1736 for (irel = internal_relocs; irel < irelend; irel++) 1737 { 1738 bfd_vma symval; 1739 1740 /* If this isn't something that can be relaxed, then ignore 1741 this reloc. */ 1742 if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP16 1743 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP24 1744 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM32 1745 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM20 1746 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM16) 1747 continue; 1748 1749 /* Get the section contents if we haven't done so already. */ 1750 if (contents == NULL) 1751 { 1752 /* Get cached copy if it exists. */ 1753 if (elf_section_data (sec)->this_hdr.contents != NULL) 1754 contents = elf_section_data (sec)->this_hdr.contents; 1755 /* Go get them off disk. */ 1756 else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1757 goto error_return; 1758 } 1759 1760 /* Read this BFD's local symbols if we haven't done so already. */ 1761 if (isymbuf == NULL && symtab_hdr->sh_info != 0) 1762 { 1763 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1764 if (isymbuf == NULL) 1765 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 1766 symtab_hdr->sh_info, 0, 1767 NULL, NULL, NULL); 1768 if (isymbuf == NULL) 1769 goto error_return; 1770 } 1771 1772 /* Get the value of the symbol referred to by the reloc. */ 1773 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 1774 { 1775 /* A local symbol. */ 1776 Elf_Internal_Sym *isym; 1777 asection *sym_sec; 1778 1779 isym = isymbuf + ELF32_R_SYM (irel->r_info); 1780 if (isym->st_shndx == SHN_UNDEF) 1781 sym_sec = bfd_und_section_ptr; 1782 else if (isym->st_shndx == SHN_ABS) 1783 sym_sec = bfd_abs_section_ptr; 1784 else if (isym->st_shndx == SHN_COMMON) 1785 sym_sec = bfd_com_section_ptr; 1786 else 1787 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 1788 symval = (isym->st_value 1789 + sym_sec->output_section->vma 1790 + sym_sec->output_offset); 1791 } 1792 else 1793 { 1794 unsigned long indx; 1795 struct elf_link_hash_entry *h; 1796 1797 /* An external symbol. */ 1798 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 1799 h = elf_sym_hashes (abfd)[indx]; 1800 BFD_ASSERT (h != NULL); 1801 1802 if (h->root.type != bfd_link_hash_defined 1803 && h->root.type != bfd_link_hash_defweak) 1804 /* This appears to be a reference to an undefined 1805 symbol. Just ignore it--it will be caught by the 1806 regular reloc processing. */ 1807 continue; 1808 1809 symval = (h->root.u.def.value 1810 + h->root.u.def.section->output_section->vma 1811 + h->root.u.def.section->output_offset); 1812 } 1813 1814 /* For simplicity of coding, we are going to modify the section 1815 contents, the section relocs, and the BFD symbol table. We 1816 must tell the rest of the code not to free up this 1817 information. It would be possible to instead create a table 1818 of changes which have to be made, as is done in coff-mips.c; 1819 that would be more work, but would require less memory when 1820 the linker is run. */ 1821 1822 /* Try to turn a 24 branch/call into a 16bit relative 1823 branch/call. */ 1824 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP24) 1825 { 1826 bfd_vma value = symval; 1827 1828 /* Deal with pc-relative gunk. */ 1829 value -= (sec->output_section->vma + sec->output_offset); 1830 value -= irel->r_offset; 1831 value += irel->r_addend; 1832 1833 /* See if the value will fit in 16 bits, note the high value is 1834 0xfffe + 2 as the target will be two bytes closer if we are 1835 able to relax. */ 1836 if ((long) value < 0x10000 && (long) value > -0x10002) 1837 { 1838 unsigned int code; 1839 1840 /* Get the opcode. */ 1841 code = (unsigned int) bfd_get_32 (abfd, 1842 contents + irel->r_offset); 1843 1844 /* Verify it's a 'bcond' and fix the opcode. */ 1845 if ((code & 0xffff) == 0x0010) 1846 bfd_put_16 (abfd, 0x1800 | ((0xf & (code >> 20)) << 4), 1847 contents + irel->r_offset); 1848 else 1849 continue; 1850 1851 /* Note that we've changed the relocs, section contents, etc. */ 1852 elf_section_data (sec)->relocs = internal_relocs; 1853 elf_section_data (sec)->this_hdr.contents = contents; 1854 symtab_hdr->contents = (unsigned char *) isymbuf; 1855 1856 /* Fix the relocation's type. */ 1857 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1858 R_CR16_DISP16); 1859 1860 /* Delete two bytes of data. */ 1861 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1862 irel->r_offset + 2, 2)) 1863 goto error_return; 1864 1865 /* That will change things, so, we should relax again. 1866 Note that this is not required, and it may be slow. */ 1867 *again = true; 1868 } 1869 } 1870 1871 /* Try to turn a 16bit pc-relative branch into an 1872 8bit pc-relative branch. */ 1873 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP16) 1874 { 1875 bfd_vma value = symval; 1876 1877 /* Deal with pc-relative gunk. */ 1878 value -= (sec->output_section->vma + sec->output_offset); 1879 value -= irel->r_offset; 1880 value += irel->r_addend; 1881 1882 /* See if the value will fit in 8 bits, note the high value is 1883 0xfc + 2 as the target will be two bytes closer if we are 1884 able to relax. */ 1885 /*if ((long) value < 0x1fa && (long) value > -0x100) REVISIT:range */ 1886 if ((long) value < 0xfa && (long) value > -0x100) 1887 { 1888 unsigned short code; 1889 1890 /* Get the opcode. */ 1891 code = bfd_get_16 (abfd, contents + irel->r_offset); 1892 1893 /* Verify it's a 'bcond' and fix the opcode. */ 1894 if ((code & 0xff0f) == 0x1800) 1895 bfd_put_16 (abfd, (code & 0xf0f0), contents + irel->r_offset); 1896 else 1897 continue; 1898 1899 /* Note that we've changed the relocs, section contents, etc. */ 1900 elf_section_data (sec)->relocs = internal_relocs; 1901 elf_section_data (sec)->this_hdr.contents = contents; 1902 symtab_hdr->contents = (unsigned char *) isymbuf; 1903 1904 /* Fix the relocation's type. */ 1905 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1906 R_CR16_DISP8); 1907 1908 /* Delete two bytes of data. */ 1909 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1910 irel->r_offset + 2, 2)) 1911 goto error_return; 1912 1913 /* That will change things, so, we should relax again. 1914 Note that this is not required, and it may be slow. */ 1915 *again = true; 1916 } 1917 } 1918 1919 /* Try to turn a 32-bit IMM address into a 20/16-bit IMM address */ 1920 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM32) 1921 { 1922 bfd_vma value = symval; 1923 unsigned short is_add_mov = 0; 1924 bfd_vma value1 = 0; 1925 1926 /* Get the existing value from the mcode */ 1927 value1 = bfd_get_32 (abfd, contents + irel->r_offset + 2); 1928 value1 = (value1 >> 16) | ((value1 & 0xffff) << 16); 1929 1930 /* See if the value will fit in 20 bits. */ 1931 if ((long) (value + value1) < 0xfffff && (long) (value + value1) > 0) 1932 { 1933 unsigned short code; 1934 1935 /* Get the opcode. */ 1936 code = bfd_get_16 (abfd, contents + irel->r_offset); 1937 1938 /* Verify it's a 'arithmetic ADDD or MOVD instruction'. 1939 For ADDD and MOVD only, convert to IMM32 -> IMM20. */ 1940 1941 if (((code & 0xfff0) == 0x0070) || ((code & 0xfff0) == 0x0020)) 1942 is_add_mov = 1; 1943 1944 if (is_add_mov) 1945 { 1946 /* Note that we've changed the relocs, section contents, 1947 etc. */ 1948 elf_section_data (sec)->relocs = internal_relocs; 1949 elf_section_data (sec)->this_hdr.contents = contents; 1950 symtab_hdr->contents = (unsigned char *) isymbuf; 1951 1952 /* Fix the opcode. */ 1953 if ((code & 0xfff0) == 0x0070) /* For movd. */ 1954 bfd_put_8 (abfd, 0x05, contents + irel->r_offset + 1); 1955 else /* code == 0x0020 for addd. */ 1956 bfd_put_8 (abfd, 0x04, contents + irel->r_offset + 1); 1957 1958 bfd_put_8 (abfd, (code & 0xf) << 4, contents + irel->r_offset); 1959 1960 /* If existing value is nagavive adjust approriately 1961 place the 16-20bits (ie 4 bit) in new opcode, 1962 as the 0xffffxxxx, the higher 2 byte values removed. */ 1963 if (value1 & 0x80000000) 1964 bfd_put_8 (abfd, 1965 (0x0f | (bfd_get_8 (abfd, 1966 contents + irel->r_offset))), 1967 contents + irel->r_offset); 1968 else 1969 bfd_put_8 (abfd, 1970 (((value1 >> 16) & 0xf) 1971 | (bfd_get_8 (abfd, 1972 contents + irel->r_offset))), 1973 contents + irel->r_offset); 1974 1975 /* Fix the relocation's type. */ 1976 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1977 R_CR16_IMM20); 1978 1979 /* Delete two bytes of data. */ 1980 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1981 irel->r_offset + 2, 2)) 1982 goto error_return; 1983 1984 /* That will change things, so, we should relax again. 1985 Note that this is not required, and it may be slow. */ 1986 *again = true; 1987 } 1988 } 1989 1990 /* See if the value will fit in 16 bits. */ 1991 if ((!is_add_mov) 1992 && ((long)(value + value1) < 0x7fff && (long)(value + value1) > 0)) 1993 { 1994 unsigned short code; 1995 1996 /* Get the opcode. */ 1997 code = bfd_get_16 (abfd, contents + irel->r_offset); 1998 1999 /* Note that we've changed the relocs, section contents, etc. */ 2000 elf_section_data (sec)->relocs = internal_relocs; 2001 elf_section_data (sec)->this_hdr.contents = contents; 2002 symtab_hdr->contents = (unsigned char *) isymbuf; 2003 2004 /* Fix the opcode. */ 2005 if ((code & 0xf0) == 0x70) /* For movd. */ 2006 bfd_put_8 (abfd, 0x54, contents + irel->r_offset + 1); 2007 else if ((code & 0xf0) == 0x20) /* For addd. */ 2008 bfd_put_8 (abfd, 0x60, contents + irel->r_offset + 1); 2009 else if ((code & 0xf0) == 0x90) /* For cmpd. */ 2010 bfd_put_8 (abfd, 0x56, contents + irel->r_offset + 1); 2011 else 2012 continue; 2013 2014 bfd_put_8 (abfd, 0xb0 | (code & 0xf), contents + irel->r_offset); 2015 2016 /* If existing value is nagavive adjust approriately 2017 place the 12-16bits (ie 4 bit) in new opcode, 2018 as the 0xfffffxxx, the higher 2 byte values removed. */ 2019 if (value1 & 0x80000000) 2020 bfd_put_8 (abfd, 2021 (0x0f | (bfd_get_8 (abfd, 2022 contents + irel->r_offset))), 2023 contents + irel->r_offset); 2024 else 2025 bfd_put_16 (abfd, value1, contents + irel->r_offset + 2); 2026 2027 2028 /* Fix the relocation's type. */ 2029 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2030 R_CR16_IMM16); 2031 2032 /* Delete two bytes of data. */ 2033 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2034 irel->r_offset + 2, 2)) 2035 goto error_return; 2036 2037 /* That will change things, so, we should relax again. 2038 Note that this is not required, and it may be slow. */ 2039 *again = true; 2040 } 2041 } 2042 2043 #if 0 2044 /* Try to turn a 16bit immediate address into a 4bit 2045 immediate address. */ 2046 if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20) 2047 || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM16)) 2048 { 2049 bfd_vma value = symval; 2050 bfd_vma value1 = 0; 2051 2052 /* Get the existing value from the mcode */ 2053 value1 = ((bfd_get_16 (abfd, contents + irel->r_offset + 2) & 0xffff)); 2054 2055 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20) 2056 { 2057 value1 |= ((bfd_get_16 (abfd, contents + irel->r_offset + 1) 2058 & 0xf000) << 0x4); 2059 } 2060 2061 /* See if the value will fit in 4 bits. */ 2062 if ((((long) (value + value1)) < 0xf) 2063 && (((long) (value + value1)) > 0)) 2064 { 2065 unsigned short code; 2066 2067 /* Get the opcode. */ 2068 code = bfd_get_16 (abfd, contents + irel->r_offset); 2069 2070 /* Note that we've changed the relocs, section contents, etc. */ 2071 elf_section_data (sec)->relocs = internal_relocs; 2072 elf_section_data (sec)->this_hdr.contents = contents; 2073 symtab_hdr->contents = (unsigned char *) isymbuf; 2074 2075 /* Fix the opcode. */ 2076 if (((code & 0x0f00) == 0x0400) || ((code & 0x0f00) == 0x0500)) 2077 { 2078 if ((code & 0x0f00) == 0x0400) /* For movd imm20. */ 2079 bfd_put_8 (abfd, 0x60, contents + irel->r_offset); 2080 else /* For addd imm20. */ 2081 bfd_put_8 (abfd, 0x54, contents + irel->r_offset); 2082 bfd_put_8 (abfd, (code & 0xf0) >> 4, 2083 contents + irel->r_offset + 1); 2084 } 2085 else 2086 { 2087 if ((code & 0xfff0) == 0x56b0) /* For cmpd imm16. */ 2088 bfd_put_8 (abfd, 0x56, contents + irel->r_offset); 2089 else if ((code & 0xfff0) == 0x54b0) /* For movd imm16. */ 2090 bfd_put_8 (abfd, 0x54, contents + irel->r_offset); 2091 else if ((code & 0xfff0) == 0x58b0) /* For movb imm16. */ 2092 bfd_put_8 (abfd, 0x58, contents + irel->r_offset); 2093 else if ((code & 0xfff0) == 0x5Ab0) /* For movw imm16. */ 2094 bfd_put_8 (abfd, 0x5A, contents + irel->r_offset); 2095 else if ((code & 0xfff0) == 0x60b0) /* For addd imm16. */ 2096 bfd_put_8 (abfd, 0x60, contents + irel->r_offset); 2097 else if ((code & 0xfff0) == 0x30b0) /* For addb imm16. */ 2098 bfd_put_8 (abfd, 0x30, contents + irel->r_offset); 2099 else if ((code & 0xfff0) == 0x2Cb0) /* For addub imm16. */ 2100 bfd_put_8 (abfd, 0x2C, contents + irel->r_offset); 2101 else if ((code & 0xfff0) == 0x32b0) /* For adduw imm16. */ 2102 bfd_put_8 (abfd, 0x32, contents + irel->r_offset); 2103 else if ((code & 0xfff0) == 0x38b0) /* For subb imm16. */ 2104 bfd_put_8 (abfd, 0x38, contents + irel->r_offset); 2105 else if ((code & 0xfff0) == 0x3Cb0) /* For subcb imm16. */ 2106 bfd_put_8 (abfd, 0x3C, contents + irel->r_offset); 2107 else if ((code & 0xfff0) == 0x3Fb0) /* For subcw imm16. */ 2108 bfd_put_8 (abfd, 0x3F, contents + irel->r_offset); 2109 else if ((code & 0xfff0) == 0x3Ab0) /* For subw imm16. */ 2110 bfd_put_8 (abfd, 0x3A, contents + irel->r_offset); 2111 else if ((code & 0xfff0) == 0x50b0) /* For cmpb imm16. */ 2112 bfd_put_8 (abfd, 0x50, contents + irel->r_offset); 2113 else if ((code & 0xfff0) == 0x52b0) /* For cmpw imm16. */ 2114 bfd_put_8 (abfd, 0x52, contents + irel->r_offset); 2115 else 2116 continue; 2117 2118 bfd_put_8 (abfd, (code & 0xf), contents + irel->r_offset + 1); 2119 } 2120 2121 /* Fix the relocation's type. */ 2122 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2123 R_CR16_IMM4); 2124 2125 /* Delete two bytes of data. */ 2126 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2127 irel->r_offset + 2, 2)) 2128 goto error_return; 2129 2130 /* That will change things, so, we should relax again. 2131 Note that this is not required, and it may be slow. */ 2132 *again = true; 2133 } 2134 } 2135 #endif 2136 } 2137 2138 if (isymbuf != NULL 2139 && symtab_hdr->contents != (unsigned char *) isymbuf) 2140 { 2141 if (! link_info->keep_memory) 2142 free (isymbuf); 2143 else 2144 /* Cache the symbols for elf_link_input_bfd. */ 2145 symtab_hdr->contents = (unsigned char *) isymbuf; 2146 } 2147 2148 if (contents != NULL 2149 && elf_section_data (sec)->this_hdr.contents != contents) 2150 { 2151 if (! link_info->keep_memory) 2152 free (contents); 2153 else 2154 /* Cache the section contents for elf_link_input_bfd. */ 2155 elf_section_data (sec)->this_hdr.contents = contents; 2156 2157 } 2158 2159 if (elf_section_data (sec)->relocs != internal_relocs) 2160 free (internal_relocs); 2161 2162 return true; 2163 2164 error_return: 2165 if (symtab_hdr->contents != (unsigned char *) isymbuf) 2166 free (isymbuf); 2167 if (elf_section_data (sec)->this_hdr.contents != contents) 2168 free (contents); 2169 if (elf_section_data (sec)->relocs != internal_relocs) 2170 free (internal_relocs); 2171 2172 return false; 2173 } 2174 2175 static asection * 2176 elf32_cr16_gc_mark_hook (asection *sec, 2177 struct bfd_link_info *info, 2178 Elf_Internal_Rela *rel, 2179 struct elf_link_hash_entry *h, 2180 Elf_Internal_Sym *sym) 2181 { 2182 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2183 } 2184 2185 /* Create dynamic sections when linking against a dynamic object. */ 2186 2187 static bool 2188 _bfd_cr16_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 2189 { 2190 flagword flags; 2191 asection * s; 2192 const struct elf_backend_data * bed = get_elf_backend_data (abfd); 2193 struct elf_link_hash_table *htab = elf_hash_table (info); 2194 int ptralign = 0; 2195 2196 switch (bed->s->arch_size) 2197 { 2198 case 16: 2199 ptralign = 1; 2200 break; 2201 2202 case 32: 2203 ptralign = 2; 2204 break; 2205 2206 default: 2207 bfd_set_error (bfd_error_bad_value); 2208 return false; 2209 } 2210 2211 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and 2212 .rel[a].bss sections. */ 2213 2214 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 2215 | SEC_LINKER_CREATED); 2216 2217 s = bfd_make_section_anyway_with_flags (abfd, 2218 (bed->default_use_rela_p 2219 ? ".rela.plt" : ".rel.plt"), 2220 flags | SEC_READONLY); 2221 htab->srelplt = s; 2222 if (s == NULL 2223 || !bfd_set_section_alignment (s, ptralign)) 2224 return false; 2225 2226 if (! _bfd_cr16_elf_create_got_section (abfd, info)) 2227 return false; 2228 2229 if (bed->want_dynbss) 2230 { 2231 /* The .dynbss section is a place to put symbols which are defined 2232 by dynamic objects, are referenced by regular objects, and are 2233 not functions. We must allocate space for them in the process 2234 image and use a R_*_COPY reloc to tell the dynamic linker to 2235 initialize them at run time. The linker script puts the .dynbss 2236 section into the .bss section of the final image. */ 2237 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss", 2238 SEC_ALLOC | SEC_LINKER_CREATED); 2239 if (s == NULL) 2240 return false; 2241 2242 /* The .rel[a].bss section holds copy relocs. This section is not 2243 normally needed. We need to create it here, though, so that the 2244 linker will map it to an output section. We can't just create it 2245 only if we need it, because we will not know whether we need it 2246 until we have seen all the input files, and the first time the 2247 main linker code calls BFD after examining all the input files 2248 (size_dynamic_sections) the input sections have already been 2249 mapped to the output sections. If the section turns out not to 2250 be needed, we can discard it later. We will never need this 2251 section when generating a shared object, since they do not use 2252 copy relocs. */ 2253 if (! bfd_link_executable (info)) 2254 { 2255 s = bfd_make_section_anyway_with_flags (abfd, 2256 (bed->default_use_rela_p 2257 ? ".rela.bss" : ".rel.bss"), 2258 flags | SEC_READONLY); 2259 if (s == NULL 2260 || !bfd_set_section_alignment (s, ptralign)) 2261 return false; 2262 } 2263 } 2264 2265 return true; 2266 } 2267 2268 /* Adjust a symbol defined by a dynamic object and referenced by a 2269 regular object. The current definition is in some section of the 2270 dynamic object, but we're not including those sections. We have to 2271 change the definition to something the rest of the link can 2272 understand. */ 2273 2274 static bool 2275 _bfd_cr16_elf_adjust_dynamic_symbol (struct bfd_link_info * info, 2276 struct elf_link_hash_entry * h) 2277 { 2278 bfd * dynobj; 2279 asection * s; 2280 2281 dynobj = elf_hash_table (info)->dynobj; 2282 2283 /* Make sure we know what is going on here. */ 2284 BFD_ASSERT (dynobj != NULL 2285 && (h->needs_plt 2286 || h->is_weakalias 2287 || (h->def_dynamic 2288 && h->ref_regular 2289 && !h->def_regular))); 2290 2291 /* If this is a function, put it in the procedure linkage table. We 2292 will fill in the contents of the procedure linkage table later, 2293 when we know the address of the .got section. */ 2294 if (h->type == STT_FUNC 2295 || h->needs_plt) 2296 { 2297 if (! bfd_link_executable (info) 2298 && !h->def_dynamic 2299 && !h->ref_dynamic) 2300 { 2301 /* This case can occur if we saw a PLT reloc in an input 2302 file, but the symbol was never referred to by a dynamic 2303 object. In such a case, we don't actually need to build 2304 a procedure linkage table, and we can just do a REL32 2305 reloc instead. */ 2306 BFD_ASSERT (h->needs_plt); 2307 return true; 2308 } 2309 2310 /* Make sure this symbol is output as a dynamic symbol. */ 2311 if (h->dynindx == -1) 2312 { 2313 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2314 return false; 2315 } 2316 2317 /* We also need to make an entry in the .got.plt section, which 2318 will be placed in the .got section by the linker script. */ 2319 2320 s = elf_hash_table (info)->sgotplt; 2321 BFD_ASSERT (s != NULL); 2322 s->size += 4; 2323 2324 /* We also need to make an entry in the .rela.plt section. */ 2325 2326 s = elf_hash_table (info)->srelplt; 2327 BFD_ASSERT (s != NULL); 2328 s->size += sizeof (Elf32_External_Rela); 2329 2330 return true; 2331 } 2332 2333 /* If this is a weak symbol, and there is a real definition, the 2334 processor independent code will have arranged for us to see the 2335 real definition first, and we can just use the same value. */ 2336 if (h->is_weakalias) 2337 { 2338 struct elf_link_hash_entry *def = weakdef (h); 2339 BFD_ASSERT (def->root.type == bfd_link_hash_defined); 2340 h->root.u.def.section = def->root.u.def.section; 2341 h->root.u.def.value = def->root.u.def.value; 2342 return true; 2343 } 2344 2345 /* This is a reference to a symbol defined by a dynamic object which 2346 is not a function. */ 2347 2348 /* If we are creating a shared library, we must presume that the 2349 only references to the symbol are via the global offset table. 2350 For such cases we need not do anything here; the relocations will 2351 be handled correctly by relocate_section. */ 2352 if (bfd_link_executable (info)) 2353 return true; 2354 2355 /* If there are no references to this symbol that do not use the 2356 GOT, we don't need to generate a copy reloc. */ 2357 if (!h->non_got_ref) 2358 return true; 2359 2360 /* We must allocate the symbol in our .dynbss section, which will 2361 become part of the .bss section of the executable. There will be 2362 an entry for this symbol in the .dynsym section. The dynamic 2363 object will contain position independent code, so all references 2364 from the dynamic object to this symbol will go through the global 2365 offset table. The dynamic linker will use the .dynsym entry to 2366 determine the address it must put in the global offset table, so 2367 both the dynamic object and the regular object will refer to the 2368 same memory location for the variable. */ 2369 2370 s = bfd_get_linker_section (dynobj, ".dynbss"); 2371 BFD_ASSERT (s != NULL); 2372 2373 /* We must generate a R_CR16_COPY reloc to tell the dynamic linker to 2374 copy the initial value out of the dynamic object and into the 2375 runtime process image. We need to remember the offset into the 2376 .rela.bss section we are going to use. */ 2377 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 2378 { 2379 asection * srel; 2380 2381 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 2382 BFD_ASSERT (srel != NULL); 2383 srel->size += sizeof (Elf32_External_Rela); 2384 h->needs_copy = 1; 2385 } 2386 2387 return _bfd_elf_adjust_dynamic_copy (info, h, s); 2388 } 2389 2390 /* Set the sizes of the dynamic sections. */ 2391 2392 static bool 2393 _bfd_cr16_elf_size_dynamic_sections (bfd * output_bfd, 2394 struct bfd_link_info * info) 2395 { 2396 bfd * dynobj; 2397 asection * s; 2398 bool relocs; 2399 2400 dynobj = elf_hash_table (info)->dynobj; 2401 BFD_ASSERT (dynobj != NULL); 2402 2403 if (elf_hash_table (info)->dynamic_sections_created) 2404 { 2405 /* Set the contents of the .interp section to the interpreter. */ 2406 if (bfd_link_executable (info) && !info->nointerp) 2407 { 2408 #if 0 2409 s = bfd_get_linker_section (dynobj, ".interp"); 2410 BFD_ASSERT (s != NULL); 2411 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2412 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2413 #endif 2414 } 2415 } 2416 else 2417 { 2418 /* We may have created entries in the .rela.got section. 2419 However, if we are not creating the dynamic sections, we will 2420 not actually use these entries. Reset the size of .rela.got, 2421 which will cause it to get stripped from the output file 2422 below. */ 2423 s = elf_hash_table (info)->srelgot; 2424 if (s != NULL) 2425 s->size = 0; 2426 } 2427 2428 /* The check_relocs and adjust_dynamic_symbol entry points have 2429 determined the sizes of the various dynamic sections. Allocate 2430 memory for them. */ 2431 relocs = false; 2432 for (s = dynobj->sections; s != NULL; s = s->next) 2433 { 2434 const char * name; 2435 2436 if ((s->flags & SEC_LINKER_CREATED) == 0) 2437 continue; 2438 2439 /* It's OK to base decisions on the section name, because none 2440 of the dynobj section names depend upon the input files. */ 2441 name = bfd_section_name (s); 2442 2443 if (strcmp (name, ".plt") == 0) 2444 { 2445 /* Remember whether there is a PLT. */ 2446 ; 2447 } 2448 else if (startswith (name, ".rela")) 2449 { 2450 if (s->size != 0) 2451 { 2452 /* Remember whether there are any reloc sections other 2453 than .rela.plt. */ 2454 if (strcmp (name, ".rela.plt") != 0) 2455 relocs = true; 2456 2457 /* We use the reloc_count field as a counter if we need 2458 to copy relocs into the output file. */ 2459 s->reloc_count = 0; 2460 } 2461 } 2462 else if (! startswith (name, ".got") 2463 && strcmp (name, ".dynbss") != 0) 2464 /* It's not one of our sections, so don't allocate space. */ 2465 continue; 2466 2467 if (s->size == 0) 2468 { 2469 /* If we don't need this section, strip it from the 2470 output file. This is mostly to handle .rela.bss and 2471 .rela.plt. We must create both sections in 2472 create_dynamic_sections, because they must be created 2473 before the linker maps input sections to output 2474 sections. The linker does that before 2475 adjust_dynamic_symbol is called, and it is that 2476 function which decides whether anything needs to go 2477 into these sections. */ 2478 s->flags |= SEC_EXCLUDE; 2479 continue; 2480 } 2481 2482 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2483 continue; 2484 2485 /* Allocate memory for the section contents. We use bfd_zalloc 2486 here in case unused entries are not reclaimed before the 2487 section's contents are written out. This should not happen, 2488 but this way if it does, we get a R_CR16_NONE reloc 2489 instead of garbage. */ 2490 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2491 if (s->contents == NULL) 2492 return false; 2493 } 2494 2495 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs); 2496 } 2497 2498 /* Finish up dynamic symbol handling. We set the contents of various 2499 dynamic sections here. */ 2500 2501 static bool 2502 _bfd_cr16_elf_finish_dynamic_symbol (bfd * output_bfd, 2503 struct bfd_link_info * info, 2504 struct elf_link_hash_entry * h, 2505 Elf_Internal_Sym * sym) 2506 { 2507 bfd * dynobj; 2508 2509 dynobj = elf_hash_table (info)->dynobj; 2510 2511 if (h->got.offset != (bfd_vma) -1) 2512 { 2513 asection * sgot; 2514 asection * srel; 2515 Elf_Internal_Rela rel; 2516 2517 /* This symbol has an entry in the global offset table. Set it up. */ 2518 2519 sgot = elf_hash_table (info)->sgot; 2520 srel = elf_hash_table (info)->srelgot; 2521 BFD_ASSERT (sgot != NULL && srel != NULL); 2522 2523 rel.r_offset = (sgot->output_section->vma 2524 + sgot->output_offset 2525 + (h->got.offset & ~1)); 2526 2527 /* If this is a -Bsymbolic link, and the symbol is defined 2528 locally, we just want to emit a RELATIVE reloc. Likewise if 2529 the symbol was forced to be local because of a version file. 2530 The entry in the global offset table will already have been 2531 initialized in the relocate_section function. */ 2532 if (bfd_link_executable (info) 2533 && (info->symbolic || h->dynindx == -1) 2534 && h->def_regular) 2535 { 2536 rel.r_info = ELF32_R_INFO (0, R_CR16_GOT_REGREL20); 2537 rel.r_addend = (h->root.u.def.value 2538 + h->root.u.def.section->output_section->vma 2539 + h->root.u.def.section->output_offset); 2540 } 2541 else 2542 { 2543 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); 2544 rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20); 2545 rel.r_addend = 0; 2546 } 2547 2548 bfd_elf32_swap_reloca_out (output_bfd, &rel, 2549 (bfd_byte *) ((Elf32_External_Rela *) srel->contents 2550 + srel->reloc_count)); 2551 ++ srel->reloc_count; 2552 } 2553 2554 if (h->needs_copy) 2555 { 2556 asection * s; 2557 Elf_Internal_Rela rel; 2558 2559 /* This symbol needs a copy reloc. Set it up. */ 2560 BFD_ASSERT (h->dynindx != -1 2561 && (h->root.type == bfd_link_hash_defined 2562 || h->root.type == bfd_link_hash_defweak)); 2563 2564 s = bfd_get_linker_section (dynobj, ".rela.bss"); 2565 BFD_ASSERT (s != NULL); 2566 2567 rel.r_offset = (h->root.u.def.value 2568 + h->root.u.def.section->output_section->vma 2569 + h->root.u.def.section->output_offset); 2570 rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20); 2571 rel.r_addend = 0; 2572 bfd_elf32_swap_reloca_out (output_bfd, &rel, 2573 (bfd_byte *) ((Elf32_External_Rela *) s->contents 2574 + s->reloc_count)); 2575 ++ s->reloc_count; 2576 } 2577 2578 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 2579 if (h == elf_hash_table (info)->hdynamic 2580 || h == elf_hash_table (info)->hgot) 2581 sym->st_shndx = SHN_ABS; 2582 2583 return true; 2584 } 2585 2586 /* Finish up the dynamic sections. */ 2587 2588 static bool 2589 _bfd_cr16_elf_finish_dynamic_sections (bfd * output_bfd, 2590 struct bfd_link_info * info) 2591 { 2592 bfd * dynobj; 2593 asection * sgot; 2594 asection * sdyn; 2595 2596 dynobj = elf_hash_table (info)->dynobj; 2597 2598 sgot = elf_hash_table (info)->sgotplt; 2599 BFD_ASSERT (sgot != NULL); 2600 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 2601 2602 if (elf_hash_table (info)->dynamic_sections_created) 2603 { 2604 Elf32_External_Dyn * dyncon; 2605 Elf32_External_Dyn * dynconend; 2606 2607 BFD_ASSERT (sdyn != NULL); 2608 2609 dyncon = (Elf32_External_Dyn *) sdyn->contents; 2610 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 2611 2612 for (; dyncon < dynconend; dyncon++) 2613 { 2614 Elf_Internal_Dyn dyn; 2615 asection * s; 2616 2617 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 2618 2619 switch (dyn.d_tag) 2620 { 2621 default: 2622 break; 2623 2624 case DT_PLTGOT: 2625 s = elf_hash_table (info)->sgotplt; 2626 goto get_vma; 2627 2628 case DT_JMPREL: 2629 s = elf_hash_table (info)->srelplt; 2630 get_vma: 2631 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 2632 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2633 break; 2634 2635 case DT_PLTRELSZ: 2636 s = elf_hash_table (info)->srelplt; 2637 dyn.d_un.d_val = s->size; 2638 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2639 break; 2640 } 2641 } 2642 2643 } 2644 2645 /* Fill in the first three entries in the global offset table. */ 2646 if (sgot->size > 0) 2647 { 2648 if (sdyn == NULL) 2649 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2650 else 2651 bfd_put_32 (output_bfd, 2652 sdyn->output_section->vma + sdyn->output_offset, 2653 sgot->contents); 2654 } 2655 2656 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2657 2658 return true; 2659 } 2660 2661 /* Given a .data.rel section and a .emreloc in-memory section, store 2662 relocation information into the .emreloc section which can be 2663 used at runtime to relocate the section. This is called by the 2664 linker when the --embedded-relocs switch is used. This is called 2665 after the add_symbols entry point has been called for all the 2666 objects, and before the final_link entry point is called. */ 2667 2668 bool 2669 bfd_cr16_elf32_create_embedded_relocs (bfd *abfd, 2670 struct bfd_link_info *info, 2671 asection *datasec, 2672 asection *relsec, 2673 char **errmsg) 2674 { 2675 Elf_Internal_Shdr *symtab_hdr; 2676 Elf_Internal_Sym *isymbuf = NULL; 2677 Elf_Internal_Rela *internal_relocs = NULL; 2678 Elf_Internal_Rela *irel, *irelend; 2679 bfd_byte *p; 2680 bfd_size_type amt; 2681 2682 BFD_ASSERT (! bfd_link_relocatable (info)); 2683 2684 *errmsg = NULL; 2685 2686 if (datasec->reloc_count == 0) 2687 return true; 2688 2689 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2690 2691 /* Get a copy of the native relocations. */ 2692 internal_relocs = (_bfd_elf_link_read_relocs 2693 (abfd, datasec, NULL, NULL, info->keep_memory)); 2694 if (internal_relocs == NULL) 2695 goto error_return; 2696 2697 amt = (bfd_size_type) datasec->reloc_count * 8; 2698 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 2699 if (relsec->contents == NULL) 2700 goto error_return; 2701 2702 p = relsec->contents; 2703 2704 irelend = internal_relocs + datasec->reloc_count; 2705 for (irel = internal_relocs; irel < irelend; irel++, p += 8) 2706 { 2707 asection *targetsec; 2708 2709 /* We are going to write a four byte longword into the runtime 2710 reloc section. The longword will be the address in the data 2711 section which must be relocated. It is followed by the name 2712 of the target section NUL-padded or truncated to 8 2713 characters. */ 2714 2715 /* We can only relocate absolute longword relocs at run time. */ 2716 if (!((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a) 2717 || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32))) 2718 { 2719 *errmsg = _("unsupported relocation type"); 2720 bfd_set_error (bfd_error_bad_value); 2721 goto error_return; 2722 } 2723 2724 /* Get the target section referred to by the reloc. */ 2725 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2726 { 2727 /* A local symbol. */ 2728 Elf_Internal_Sym *isym; 2729 2730 /* Read this BFD's local symbols if we haven't done so already. */ 2731 if (isymbuf == NULL) 2732 { 2733 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2734 if (isymbuf == NULL) 2735 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2736 symtab_hdr->sh_info, 0, 2737 NULL, NULL, NULL); 2738 if (isymbuf == NULL) 2739 goto error_return; 2740 } 2741 2742 isym = isymbuf + ELF32_R_SYM (irel->r_info); 2743 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2744 } 2745 else 2746 { 2747 unsigned long indx; 2748 struct elf_link_hash_entry *h; 2749 2750 /* An external symbol. */ 2751 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2752 h = elf_sym_hashes (abfd)[indx]; 2753 BFD_ASSERT (h != NULL); 2754 if (h->root.type == bfd_link_hash_defined 2755 || h->root.type == bfd_link_hash_defweak) 2756 targetsec = h->root.u.def.section; 2757 else 2758 targetsec = NULL; 2759 } 2760 2761 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 2762 memset (p + 4, 0, 4); 2763 if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a) 2764 && (targetsec != NULL) ) 2765 strncpy ((char *) p + 4, targetsec->output_section->name, 4); 2766 } 2767 2768 if (symtab_hdr->contents != (unsigned char *) isymbuf) 2769 free (isymbuf); 2770 if (elf_section_data (datasec)->relocs != internal_relocs) 2771 free (internal_relocs); 2772 return true; 2773 2774 error_return: 2775 if (symtab_hdr->contents != (unsigned char *) isymbuf) 2776 free (isymbuf); 2777 if (elf_section_data (datasec)->relocs != internal_relocs) 2778 free (internal_relocs); 2779 return false; 2780 } 2781 2782 2783 /* Classify relocation types, such that combreloc can sort them 2784 properly. */ 2785 2786 static enum elf_reloc_type_class 2787 _bfd_cr16_elf_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 2788 const asection *rel_sec ATTRIBUTE_UNUSED, 2789 const Elf_Internal_Rela *rela) 2790 { 2791 switch ((int) ELF32_R_TYPE (rela->r_info)) 2792 { 2793 case R_CR16_GOT_REGREL20: 2794 case R_CR16_GOTC_REGREL20: 2795 return reloc_class_relative; 2796 default: 2797 return reloc_class_normal; 2798 } 2799 } 2800 2801 /* Definitions for setting CR16 target vector. */ 2802 #define TARGET_LITTLE_SYM cr16_elf32_vec 2803 #define TARGET_LITTLE_NAME "elf32-cr16" 2804 #define ELF_ARCH bfd_arch_cr16 2805 #define ELF_MACHINE_CODE EM_CR16 2806 #define ELF_MACHINE_ALT1 EM_CR16_OLD 2807 #define ELF_MAXPAGESIZE 0x1 2808 #define elf_symbol_leading_char '_' 2809 2810 #define bfd_elf32_bfd_reloc_type_lookup elf_cr16_reloc_type_lookup 2811 #define bfd_elf32_bfd_reloc_name_lookup elf_cr16_reloc_name_lookup 2812 #define elf_info_to_howto elf_cr16_info_to_howto 2813 #define elf_info_to_howto_rel NULL 2814 #define elf_backend_relocate_section elf32_cr16_relocate_section 2815 #define bfd_elf32_bfd_relax_section elf32_cr16_relax_section 2816 #define bfd_elf32_bfd_get_relocated_section_contents \ 2817 elf32_cr16_get_relocated_section_contents 2818 #define elf_backend_gc_mark_hook elf32_cr16_gc_mark_hook 2819 #define elf_backend_can_gc_sections 1 2820 #define elf_backend_rela_normal 1 2821 #define elf_backend_check_relocs cr16_elf_check_relocs 2822 /* So we can set bits in e_flags. */ 2823 #define elf_backend_final_write_processing \ 2824 _bfd_cr16_elf_final_write_processing 2825 #define elf_backend_object_p _bfd_cr16_elf_object_p 2826 2827 #define bfd_elf32_bfd_merge_private_bfd_data \ 2828 _bfd_cr16_elf_merge_private_bfd_data 2829 2830 2831 #define bfd_elf32_bfd_link_hash_table_create \ 2832 elf32_cr16_link_hash_table_create 2833 2834 #define elf_backend_create_dynamic_sections \ 2835 _bfd_cr16_elf_create_dynamic_sections 2836 #define elf_backend_adjust_dynamic_symbol \ 2837 _bfd_cr16_elf_adjust_dynamic_symbol 2838 #define elf_backend_size_dynamic_sections \ 2839 _bfd_cr16_elf_size_dynamic_sections 2840 #define elf_backend_omit_section_dynsym _bfd_elf_omit_section_dynsym_all 2841 #define elf_backend_finish_dynamic_symbol \ 2842 _bfd_cr16_elf_finish_dynamic_symbol 2843 #define elf_backend_finish_dynamic_sections \ 2844 _bfd_cr16_elf_finish_dynamic_sections 2845 2846 #define elf_backend_reloc_type_class _bfd_cr16_elf_reloc_type_class 2847 2848 2849 #define elf_backend_want_got_plt 1 2850 #define elf_backend_plt_readonly 1 2851 #define elf_backend_want_plt_sym 0 2852 #define elf_backend_got_header_size 12 2853 #define elf_backend_dtrel_excludes_plt 1 2854 2855 #include "elf32-target.h" 2856