1/* BFD back-end for National Semiconductor's CR16 ELF 2 Copyright (C) 2007-2017 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 29/* The cr16 linker needs to keep track of the number of relocs that 30 it decides to copy in check_relocs for each symbol. This is so 31 that it can discard PC relative relocs if it doesn't need them when 32 linking with -Bsymbolic. We store the information in a field 33 extending the regular ELF linker hash table. */ 34 35struct elf32_cr16_link_hash_entry 36{ 37 /* The basic elf link hash table entry. */ 38 struct elf_link_hash_entry root; 39 40 /* For function symbols, the number of times this function is 41 called directly (ie by name). */ 42 unsigned int direct_calls; 43 44 /* For function symbols, the size of this function's stack 45 (if <= 255 bytes). We stuff this into "call" instructions 46 to this target when it's valid and profitable to do so. 47 48 This does not include stack allocated by movm! */ 49 unsigned char stack_size; 50 51 /* For function symbols, arguments (if any) for movm instruction 52 in the prologue. We stuff this value into "call" instructions 53 to the target when it's valid and profitable to do so. */ 54 unsigned char movm_args; 55 56 /* For function symbols, the amount of stack space that would be allocated 57 by the movm instruction. This is redundant with movm_args, but we 58 add it to the hash table to avoid computing it over and over. */ 59 unsigned char movm_stack_size; 60 61/* Used to mark functions which have had redundant parts of their 62 prologue deleted. */ 63#define CR16_DELETED_PROLOGUE_BYTES 0x1 64 unsigned char flags; 65 66 /* Calculated value. */ 67 bfd_vma value; 68}; 69 70/* cr16_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */ 71 72struct cr16_reloc_map 73{ 74 bfd_reloc_code_real_type bfd_reloc_enum; /* BFD relocation enum. */ 75 unsigned short cr16_reloc_type; /* CR16 relocation type. */ 76}; 77 78static const struct cr16_reloc_map cr16_reloc_map[R_CR16_MAX] = 79{ 80 {BFD_RELOC_NONE, R_CR16_NONE}, 81 {BFD_RELOC_CR16_NUM8, R_CR16_NUM8}, 82 {BFD_RELOC_CR16_NUM16, R_CR16_NUM16}, 83 {BFD_RELOC_CR16_NUM32, R_CR16_NUM32}, 84 {BFD_RELOC_CR16_NUM32a, R_CR16_NUM32a}, 85 {BFD_RELOC_CR16_REGREL4, R_CR16_REGREL4}, 86 {BFD_RELOC_CR16_REGREL4a, R_CR16_REGREL4a}, 87 {BFD_RELOC_CR16_REGREL14, R_CR16_REGREL14}, 88 {BFD_RELOC_CR16_REGREL14a, R_CR16_REGREL14a}, 89 {BFD_RELOC_CR16_REGREL16, R_CR16_REGREL16}, 90 {BFD_RELOC_CR16_REGREL20, R_CR16_REGREL20}, 91 {BFD_RELOC_CR16_REGREL20a, R_CR16_REGREL20a}, 92 {BFD_RELOC_CR16_ABS20, R_CR16_ABS20}, 93 {BFD_RELOC_CR16_ABS24, R_CR16_ABS24}, 94 {BFD_RELOC_CR16_IMM4, R_CR16_IMM4}, 95 {BFD_RELOC_CR16_IMM8, R_CR16_IMM8}, 96 {BFD_RELOC_CR16_IMM16, R_CR16_IMM16}, 97 {BFD_RELOC_CR16_IMM20, R_CR16_IMM20}, 98 {BFD_RELOC_CR16_IMM24, R_CR16_IMM24}, 99 {BFD_RELOC_CR16_IMM32, R_CR16_IMM32}, 100 {BFD_RELOC_CR16_IMM32a, R_CR16_IMM32a}, 101 {BFD_RELOC_CR16_DISP4, R_CR16_DISP4}, 102 {BFD_RELOC_CR16_DISP8, R_CR16_DISP8}, 103 {BFD_RELOC_CR16_DISP16, R_CR16_DISP16}, 104 {BFD_RELOC_CR16_DISP24, R_CR16_DISP24}, 105 {BFD_RELOC_CR16_DISP24a, R_CR16_DISP24a}, 106 {BFD_RELOC_CR16_SWITCH8, R_CR16_SWITCH8}, 107 {BFD_RELOC_CR16_SWITCH16, R_CR16_SWITCH16}, 108 {BFD_RELOC_CR16_SWITCH32, R_CR16_SWITCH32}, 109 {BFD_RELOC_CR16_GOT_REGREL20, R_CR16_GOT_REGREL20}, 110 {BFD_RELOC_CR16_GOTC_REGREL20, R_CR16_GOTC_REGREL20}, 111 {BFD_RELOC_CR16_GLOB_DAT, R_CR16_GLOB_DAT} 112}; 113 114static reloc_howto_type cr16_elf_howto_table[] = 115{ 116 HOWTO (R_CR16_NONE, /* type */ 117 0, /* rightshift */ 118 3, /* size */ 119 0, /* bitsize */ 120 FALSE, /* pc_relative */ 121 0, /* bitpos */ 122 complain_overflow_dont, /* complain_on_overflow */ 123 bfd_elf_generic_reloc, /* special_function */ 124 "R_CR16_NONE", /* name */ 125 FALSE, /* partial_inplace */ 126 0, /* src_mask */ 127 0, /* dst_mask */ 128 FALSE), /* pcrel_offset */ 129 130 HOWTO (R_CR16_NUM8, /* type */ 131 0, /* rightshift */ 132 0, /* size */ 133 8, /* bitsize */ 134 FALSE, /* pc_relative */ 135 0, /* bitpos */ 136 complain_overflow_bitfield,/* complain_on_overflow */ 137 bfd_elf_generic_reloc, /* special_function */ 138 "R_CR16_NUM8", /* name */ 139 FALSE, /* partial_inplace */ 140 0x0, /* src_mask */ 141 0xff, /* dst_mask */ 142 FALSE), /* pcrel_offset */ 143 144 HOWTO (R_CR16_NUM16, /* type */ 145 0, /* rightshift */ 146 1, /* size */ 147 16, /* bitsize */ 148 FALSE, /* pc_relative */ 149 0, /* bitpos */ 150 complain_overflow_bitfield,/* complain_on_overflow */ 151 bfd_elf_generic_reloc, /* special_function */ 152 "R_CR16_NUM16", /* name */ 153 FALSE, /* partial_inplace */ 154 0x0, /* src_mask */ 155 0xffff, /* dst_mask */ 156 FALSE), /* pcrel_offset */ 157 158 HOWTO (R_CR16_NUM32, /* type */ 159 0, /* rightshift */ 160 2, /* size */ 161 32, /* bitsize */ 162 FALSE, /* pc_relative */ 163 0, /* bitpos */ 164 complain_overflow_bitfield,/* complain_on_overflow */ 165 bfd_elf_generic_reloc, /* special_function */ 166 "R_CR16_NUM32", /* name */ 167 FALSE, /* partial_inplace */ 168 0x0, /* src_mask */ 169 0xffffffff, /* dst_mask */ 170 FALSE), /* pcrel_offset */ 171 172 HOWTO (R_CR16_NUM32a, /* type */ 173 1, /* rightshift */ 174 2, /* size */ 175 32, /* bitsize */ 176 FALSE, /* pc_relative */ 177 0, /* bitpos */ 178 complain_overflow_bitfield,/* complain_on_overflow */ 179 bfd_elf_generic_reloc, /* special_function */ 180 "R_CR16_NUM32a", /* name */ 181 FALSE, /* partial_inplace */ 182 0x0, /* src_mask */ 183 0xffffffff, /* dst_mask */ 184 FALSE), /* pcrel_offset */ 185 186 HOWTO (R_CR16_REGREL4, /* type */ 187 0, /* rightshift */ 188 0, /* size */ 189 4, /* bitsize */ 190 FALSE, /* pc_relative */ 191 0, /* bitpos */ 192 complain_overflow_bitfield,/* complain_on_overflow */ 193 bfd_elf_generic_reloc, /* special_function */ 194 "R_CR16_REGREL4", /* name */ 195 FALSE, /* partial_inplace */ 196 0x0, /* src_mask */ 197 0xf, /* dst_mask */ 198 FALSE), /* pcrel_offset */ 199 200 HOWTO (R_CR16_REGREL4a, /* type */ 201 0, /* rightshift */ 202 0, /* size */ 203 4, /* bitsize */ 204 FALSE, /* pc_relative */ 205 0, /* bitpos */ 206 complain_overflow_bitfield,/* complain_on_overflow */ 207 bfd_elf_generic_reloc, /* special_function */ 208 "R_CR16_REGREL4a", /* name */ 209 FALSE, /* partial_inplace */ 210 0x0, /* src_mask */ 211 0xf, /* dst_mask */ 212 FALSE), /* pcrel_offset */ 213 214 HOWTO (R_CR16_REGREL14, /* type */ 215 0, /* rightshift */ 216 1, /* size */ 217 14, /* bitsize */ 218 FALSE, /* pc_relative */ 219 0, /* bitpos */ 220 complain_overflow_bitfield,/* complain_on_overflow */ 221 bfd_elf_generic_reloc, /* special_function */ 222 "R_CR16_REGREL14", /* name */ 223 FALSE, /* partial_inplace */ 224 0x0, /* src_mask */ 225 0x3fff, /* dst_mask */ 226 FALSE), /* pcrel_offset */ 227 228 HOWTO (R_CR16_REGREL14a, /* type */ 229 0, /* rightshift */ 230 1, /* size */ 231 14, /* bitsize */ 232 FALSE, /* pc_relative */ 233 0, /* bitpos */ 234 complain_overflow_bitfield,/* complain_on_overflow */ 235 bfd_elf_generic_reloc, /* special_function */ 236 "R_CR16_REGREL14a", /* name */ 237 FALSE, /* partial_inplace */ 238 0x0, /* src_mask */ 239 0x3fff, /* dst_mask */ 240 FALSE), /* pcrel_offset */ 241 242 HOWTO (R_CR16_REGREL16, /* type */ 243 0, /* rightshift */ 244 1, /* size */ 245 16, /* bitsize */ 246 FALSE, /* pc_relative */ 247 0, /* bitpos */ 248 complain_overflow_bitfield,/* complain_on_overflow */ 249 bfd_elf_generic_reloc, /* special_function */ 250 "R_CR16_REGREL16", /* name */ 251 FALSE, /* partial_inplace */ 252 0x0, /* src_mask */ 253 0xffff, /* dst_mask */ 254 FALSE), /* pcrel_offset */ 255 256 HOWTO (R_CR16_REGREL20, /* type */ 257 0, /* rightshift */ 258 2, /* size */ 259 20, /* bitsize */ 260 FALSE, /* pc_relative */ 261 0, /* bitpos */ 262 complain_overflow_bitfield,/* complain_on_overflow */ 263 bfd_elf_generic_reloc, /* special_function */ 264 "R_CR16_REGREL20", /* name */ 265 FALSE, /* partial_inplace */ 266 0x0, /* src_mask */ 267 0xfffff, /* dst_mask */ 268 FALSE), /* pcrel_offset */ 269 270 HOWTO (R_CR16_REGREL20a, /* type */ 271 0, /* rightshift */ 272 2, /* size */ 273 20, /* bitsize */ 274 FALSE, /* pc_relative */ 275 0, /* bitpos */ 276 complain_overflow_bitfield,/* complain_on_overflow */ 277 bfd_elf_generic_reloc, /* special_function */ 278 "R_CR16_REGREL20a", /* name */ 279 FALSE, /* partial_inplace */ 280 0x0, /* src_mask */ 281 0xfffff, /* dst_mask */ 282 FALSE), /* pcrel_offset */ 283 284 HOWTO (R_CR16_ABS20, /* type */ 285 0, /* rightshift */ 286 2, /* size */ 287 20, /* bitsize */ 288 FALSE, /* pc_relative */ 289 0, /* bitpos */ 290 complain_overflow_bitfield,/* complain_on_overflow */ 291 bfd_elf_generic_reloc, /* special_function */ 292 "R_CR16_ABS20", /* name */ 293 FALSE, /* partial_inplace */ 294 0x0, /* src_mask */ 295 0xfffff, /* dst_mask */ 296 FALSE), /* pcrel_offset */ 297 298 HOWTO (R_CR16_ABS24, /* type */ 299 0, /* rightshift */ 300 2, /* size */ 301 24, /* bitsize */ 302 FALSE, /* pc_relative */ 303 0, /* bitpos */ 304 complain_overflow_bitfield,/* complain_on_overflow */ 305 bfd_elf_generic_reloc, /* special_function */ 306 "R_CR16_ABS24", /* name */ 307 FALSE, /* partial_inplace */ 308 0x0, /* src_mask */ 309 0xffffff, /* dst_mask */ 310 FALSE), /* pcrel_offset */ 311 312 HOWTO (R_CR16_IMM4, /* type */ 313 0, /* rightshift */ 314 0, /* size */ 315 4, /* bitsize */ 316 FALSE, /* pc_relative */ 317 0, /* bitpos */ 318 complain_overflow_bitfield,/* complain_on_overflow */ 319 bfd_elf_generic_reloc, /* special_function */ 320 "R_CR16_IMM4", /* name */ 321 FALSE, /* partial_inplace */ 322 0x0, /* src_mask */ 323 0xf, /* dst_mask */ 324 FALSE), /* pcrel_offset */ 325 326 HOWTO (R_CR16_IMM8, /* type */ 327 0, /* rightshift */ 328 0, /* size */ 329 8, /* bitsize */ 330 FALSE, /* pc_relative */ 331 0, /* bitpos */ 332 complain_overflow_bitfield,/* complain_on_overflow */ 333 bfd_elf_generic_reloc, /* special_function */ 334 "R_CR16_IMM8", /* name */ 335 FALSE, /* partial_inplace */ 336 0x0, /* src_mask */ 337 0xff, /* dst_mask */ 338 FALSE), /* pcrel_offset */ 339 340 HOWTO (R_CR16_IMM16, /* type */ 341 0, /* rightshift */ 342 1, /* size */ 343 16, /* bitsize */ 344 FALSE, /* pc_relative */ 345 0, /* bitpos */ 346 complain_overflow_bitfield,/* complain_on_overflow */ 347 bfd_elf_generic_reloc, /* special_function */ 348 "R_CR16_IMM16", /* name */ 349 FALSE, /* partial_inplace */ 350 0x0, /* src_mask */ 351 0xffff, /* dst_mask */ 352 FALSE), /* pcrel_offset */ 353 354 HOWTO (R_CR16_IMM20, /* type */ 355 0, /* rightshift */ 356 2, /* size */ 357 20, /* bitsize */ 358 FALSE, /* pc_relative */ 359 0, /* bitpos */ 360 complain_overflow_bitfield,/* complain_on_overflow */ 361 bfd_elf_generic_reloc, /* special_function */ 362 "R_CR16_IMM20", /* name */ 363 FALSE, /* partial_inplace */ 364 0x0, /* src_mask */ 365 0xfffff, /* dst_mask */ 366 FALSE), /* pcrel_offset */ 367 368 HOWTO (R_CR16_IMM24, /* type */ 369 0, /* rightshift */ 370 2, /* size */ 371 24, /* bitsize */ 372 FALSE, /* pc_relative */ 373 0, /* bitpos */ 374 complain_overflow_bitfield,/* complain_on_overflow */ 375 bfd_elf_generic_reloc, /* special_function */ 376 "R_CR16_IMM24", /* name */ 377 FALSE, /* partial_inplace */ 378 0x0, /* src_mask */ 379 0xffffff, /* dst_mask */ 380 FALSE), /* pcrel_offset */ 381 382 HOWTO (R_CR16_IMM32, /* type */ 383 0, /* rightshift */ 384 2, /* size */ 385 32, /* bitsize */ 386 FALSE, /* pc_relative */ 387 0, /* bitpos */ 388 complain_overflow_bitfield,/* complain_on_overflow */ 389 bfd_elf_generic_reloc, /* special_function */ 390 "R_CR16_IMM32", /* name */ 391 FALSE, /* partial_inplace */ 392 0x0, /* src_mask */ 393 0xffffffff, /* dst_mask */ 394 FALSE), /* pcrel_offset */ 395 396 HOWTO (R_CR16_IMM32a, /* type */ 397 1, /* rightshift */ 398 2, /* size */ 399 32, /* bitsize */ 400 FALSE, /* pc_relative */ 401 0, /* bitpos */ 402 complain_overflow_bitfield,/* complain_on_overflow */ 403 bfd_elf_generic_reloc, /* special_function */ 404 "R_CR16_IMM32a", /* name */ 405 FALSE, /* partial_inplace */ 406 0x0, /* src_mask */ 407 0xffffffff, /* dst_mask */ 408 FALSE), /* pcrel_offset */ 409 410 HOWTO (R_CR16_DISP4, /* type */ 411 1, /* rightshift */ 412 0, /* size (0 = byte, 1 = short, 2 = long) */ 413 4, /* bitsize */ 414 TRUE, /* pc_relative */ 415 0, /* bitpos */ 416 complain_overflow_unsigned, /* complain_on_overflow */ 417 bfd_elf_generic_reloc, /* special_function */ 418 "R_CR16_DISP4", /* name */ 419 FALSE, /* partial_inplace */ 420 0x0, /* src_mask */ 421 0xf, /* dst_mask */ 422 FALSE), /* pcrel_offset */ 423 424 HOWTO (R_CR16_DISP8, /* type */ 425 1, /* rightshift */ 426 0, /* size (0 = byte, 1 = short, 2 = long) */ 427 8, /* bitsize */ 428 TRUE, /* pc_relative */ 429 0, /* bitpos */ 430 complain_overflow_unsigned, /* complain_on_overflow */ 431 bfd_elf_generic_reloc, /* special_function */ 432 "R_CR16_DISP8", /* name */ 433 FALSE, /* partial_inplace */ 434 0x0, /* src_mask */ 435 0x1ff, /* dst_mask */ 436 FALSE), /* pcrel_offset */ 437 438 HOWTO (R_CR16_DISP16, /* type */ 439 0, /* rightshift REVIITS: To sync with WinIDEA*/ 440 1, /* size (0 = byte, 1 = short, 2 = long) */ 441 16, /* bitsize */ 442 TRUE, /* pc_relative */ 443 0, /* bitpos */ 444 complain_overflow_unsigned, /* complain_on_overflow */ 445 bfd_elf_generic_reloc, /* special_function */ 446 "R_CR16_DISP16", /* name */ 447 FALSE, /* partial_inplace */ 448 0x0, /* src_mask */ 449 0x1ffff, /* dst_mask */ 450 FALSE), /* pcrel_offset */ 451 /* REVISIT: DISP24 should be left-shift by 2 as per ISA doc 452 but its not done, to sync with WinIDEA and CR16 4.1 tools */ 453 HOWTO (R_CR16_DISP24, /* type */ 454 0, /* rightshift */ 455 2, /* size (0 = byte, 1 = short, 2 = long) */ 456 24, /* bitsize */ 457 TRUE, /* pc_relative */ 458 0, /* bitpos */ 459 complain_overflow_unsigned, /* complain_on_overflow */ 460 bfd_elf_generic_reloc, /* special_function */ 461 "R_CR16_DISP24", /* name */ 462 FALSE, /* partial_inplace */ 463 0x0, /* src_mask */ 464 0x1ffffff, /* dst_mask */ 465 FALSE), /* pcrel_offset */ 466 467 HOWTO (R_CR16_DISP24a, /* type */ 468 0, /* rightshift */ 469 2, /* size (0 = byte, 1 = short, 2 = long) */ 470 24, /* bitsize */ 471 TRUE, /* pc_relative */ 472 0, /* bitpos */ 473 complain_overflow_unsigned, /* complain_on_overflow */ 474 bfd_elf_generic_reloc, /* special_function */ 475 "R_CR16_DISP24a", /* name */ 476 FALSE, /* partial_inplace */ 477 0x0, /* src_mask */ 478 0xffffff, /* dst_mask */ 479 FALSE), /* pcrel_offset */ 480 481 /* An 8 bit switch table entry. This is generated for an expression 482 such as ``.byte L1 - L2''. The offset holds the difference 483 between the reloc address and L2. */ 484 HOWTO (R_CR16_SWITCH8, /* type */ 485 0, /* rightshift */ 486 0, /* size (0 = byte, 1 = short, 2 = long) */ 487 8, /* bitsize */ 488 FALSE, /* pc_relative */ 489 0, /* bitpos */ 490 complain_overflow_unsigned, /* complain_on_overflow */ 491 bfd_elf_generic_reloc, /* special_function */ 492 "R_CR16_SWITCH8", /* name */ 493 FALSE, /* partial_inplace */ 494 0x0, /* src_mask */ 495 0xff, /* dst_mask */ 496 TRUE), /* pcrel_offset */ 497 498 /* A 16 bit switch table entry. This is generated for an expression 499 such as ``.word L1 - L2''. The offset holds the difference 500 between the reloc address and L2. */ 501 HOWTO (R_CR16_SWITCH16, /* type */ 502 0, /* rightshift */ 503 1, /* size (0 = byte, 1 = short, 2 = long) */ 504 16, /* bitsize */ 505 FALSE, /* pc_relative */ 506 0, /* bitpos */ 507 complain_overflow_unsigned, /* complain_on_overflow */ 508 bfd_elf_generic_reloc, /* special_function */ 509 "R_CR16_SWITCH16", /* name */ 510 FALSE, /* partial_inplace */ 511 0x0, /* src_mask */ 512 0xffff, /* dst_mask */ 513 TRUE), /* pcrel_offset */ 514 515 /* A 32 bit switch table entry. This is generated for an expression 516 such as ``.long L1 - L2''. The offset holds the difference 517 between the reloc address and L2. */ 518 HOWTO (R_CR16_SWITCH32, /* type */ 519 0, /* rightshift */ 520 2, /* size (0 = byte, 1 = short, 2 = long) */ 521 32, /* bitsize */ 522 FALSE, /* pc_relative */ 523 0, /* bitpos */ 524 complain_overflow_unsigned, /* complain_on_overflow */ 525 bfd_elf_generic_reloc, /* special_function */ 526 "R_CR16_SWITCH32", /* name */ 527 FALSE, /* partial_inplace */ 528 0x0, /* src_mask */ 529 0xffffffff, /* dst_mask */ 530 TRUE), /* pcrel_offset */ 531 532 HOWTO (R_CR16_GOT_REGREL20, /* type */ 533 0, /* rightshift */ 534 2, /* size */ 535 20, /* bitsize */ 536 FALSE, /* pc_relative */ 537 0, /* bitpos */ 538 complain_overflow_bitfield,/* complain_on_overflow */ 539 bfd_elf_generic_reloc, /* special_function */ 540 "R_CR16_GOT_REGREL20", /* name */ 541 TRUE, /* partial_inplace */ 542 0x0, /* src_mask */ 543 0xfffff, /* dst_mask */ 544 FALSE), /* pcrel_offset */ 545 546 HOWTO (R_CR16_GOTC_REGREL20, /* type */ 547 0, /* rightshift */ 548 2, /* size */ 549 20, /* bitsize */ 550 FALSE, /* pc_relative */ 551 0, /* bitpos */ 552 complain_overflow_bitfield,/* complain_on_overflow */ 553 bfd_elf_generic_reloc, /* special_function */ 554 "R_CR16_GOTC_REGREL20", /* name */ 555 TRUE, /* partial_inplace */ 556 0x0, /* src_mask */ 557 0xfffff, /* dst_mask */ 558 FALSE), /* pcrel_offset */ 559 560 HOWTO (R_CR16_GLOB_DAT, /* type */ 561 0, /* rightshift */ 562 2, /* size (0 = byte, 1 = short, 2 = long) */ 563 32, /* bitsize */ 564 FALSE, /* pc_relative */ 565 0, /* bitpos */ 566 complain_overflow_unsigned, /* complain_on_overflow */ 567 bfd_elf_generic_reloc, /* special_function */ 568 "R_CR16_GLOB_DAT", /* name */ 569 FALSE, /* partial_inplace */ 570 0x0, /* src_mask */ 571 0xffffffff, /* dst_mask */ 572 TRUE) /* pcrel_offset */ 573}; 574 575 576/* Create the GOT section. */ 577 578static bfd_boolean 579_bfd_cr16_elf_create_got_section (bfd * abfd, struct bfd_link_info * info) 580{ 581 flagword flags; 582 asection * s; 583 struct elf_link_hash_entry * h; 584 const struct elf_backend_data * bed = get_elf_backend_data (abfd); 585 struct elf_link_hash_table *htab = elf_hash_table (info); 586 int ptralign; 587 588 /* This function may be called more than once. */ 589 if (htab->sgot != NULL) 590 return TRUE; 591 592 switch (bed->s->arch_size) 593 { 594 case 16: 595 ptralign = 1; 596 break; 597 598 case 32: 599 ptralign = 2; 600 break; 601 602 default: 603 bfd_set_error (bfd_error_bad_value); 604 return FALSE; 605 } 606 607 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 608 | SEC_LINKER_CREATED); 609 610 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags); 611 htab->sgot= s; 612 if (s == NULL 613 || ! bfd_set_section_alignment (abfd, s, ptralign)) 614 return FALSE; 615 616 if (bed->want_got_plt) 617 { 618 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags); 619 htab->sgotplt = s; 620 if (s == NULL 621 || ! bfd_set_section_alignment (abfd, s, ptralign)) 622 return FALSE; 623 } 624 625 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got 626 (or .got.plt) section. We don't do this in the linker script 627 because we don't want to define the symbol if we are not creating 628 a global offset table. */ 629 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_"); 630 htab->hgot = h; 631 if (h == NULL) 632 return FALSE; 633 634 /* The first bit of the global offset table is the header. */ 635 s->size += bed->got_header_size; 636 637 return TRUE; 638} 639 640 641/* Retrieve a howto ptr using a BFD reloc_code. */ 642 643static reloc_howto_type * 644elf_cr16_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 645 bfd_reloc_code_real_type code) 646{ 647 unsigned int i; 648 649 for (i = 0; i < R_CR16_MAX; i++) 650 if (code == cr16_reloc_map[i].bfd_reloc_enum) 651 return &cr16_elf_howto_table[cr16_reloc_map[i].cr16_reloc_type]; 652 653 _bfd_error_handler (_("Unsupported CR16 relocation type: 0x%x\n"), code); 654 return NULL; 655} 656 657static reloc_howto_type * 658elf_cr16_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 659 const char *r_name) 660{ 661 unsigned int i; 662 663 for (i = 0; ARRAY_SIZE (cr16_elf_howto_table); i++) 664 if (cr16_elf_howto_table[i].name != NULL 665 && strcasecmp (cr16_elf_howto_table[i].name, r_name) == 0) 666 return cr16_elf_howto_table + i; 667 668 return NULL; 669} 670 671/* Retrieve a howto ptr using an internal relocation entry. */ 672 673static void 674elf_cr16_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, 675 Elf_Internal_Rela *dst) 676{ 677 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 678 679 if (r_type >= R_CR16_MAX) 680 { 681 /* xgettext:c-format */ 682 _bfd_error_handler (_("%B: unrecognised CR16 reloc number: %d"), 683 abfd, r_type); 684 bfd_set_error (bfd_error_bad_value); 685 r_type = R_CR16_NONE; 686 } 687 cache_ptr->howto = cr16_elf_howto_table + r_type; 688} 689 690/* Look through the relocs for a section during the first phase. 691 Since we don't do .gots or .plts, we just need to consider the 692 virtual table relocs for gc. */ 693 694static bfd_boolean 695cr16_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, 696 const Elf_Internal_Rela *relocs) 697{ 698 Elf_Internal_Shdr *symtab_hdr; 699 Elf_Internal_Sym * isymbuf = NULL; 700 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 701 const Elf_Internal_Rela *rel; 702 const Elf_Internal_Rela *rel_end; 703 bfd * dynobj; 704 bfd_vma * local_got_offsets; 705 asection * sgot; 706 asection * srelgot; 707 708 sgot = NULL; 709 srelgot = NULL; 710 bfd_boolean result = FALSE; 711 712 if (bfd_link_relocatable (info)) 713 return TRUE; 714 715 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 716 sym_hashes = elf_sym_hashes (abfd); 717 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); 718 if (!elf_bad_symtab (abfd)) 719 sym_hashes_end -= symtab_hdr->sh_info; 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 /* PR15323, ref flags aren't set for references in the same 740 object. */ 741 h->root.non_ir_ref = 1; 742 } 743 744 /* Some relocs require a global offset table. */ 745 if (dynobj == NULL) 746 { 747 switch (ELF32_R_TYPE (rel->r_info)) 748 { 749 case R_CR16_GOT_REGREL20: 750 case R_CR16_GOTC_REGREL20: 751 elf_hash_table (info)->dynobj = dynobj = abfd; 752 if (! _bfd_cr16_elf_create_got_section (dynobj, info)) 753 goto fail; 754 break; 755 756 default: 757 break; 758 } 759 } 760 761 switch (ELF32_R_TYPE (rel->r_info)) 762 { 763 case R_CR16_GOT_REGREL20: 764 case R_CR16_GOTC_REGREL20: 765 /* This symbol requires a global offset table entry. */ 766 767 sgot = elf_hash_table (info)->sgot; 768 srelgot = elf_hash_table (info)->srelgot; 769 BFD_ASSERT (sgot != NULL && srelgot != NULL); 770 771 if (h != NULL) 772 { 773 if (h->got.offset != (bfd_vma) -1) 774 /* We have already allocated space in the .got. */ 775 break; 776 777 h->got.offset = sgot->size; 778 779 /* Make sure this symbol is output as a dynamic symbol. */ 780 if (h->dynindx == -1) 781 { 782 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 783 goto fail; 784 } 785 786 srelgot->size += sizeof (Elf32_External_Rela); 787 } 788 else 789 { 790 /* This is a global offset table entry for a local 791 symbol. */ 792 if (local_got_offsets == NULL) 793 { 794 size_t size; 795 unsigned int i; 796 797 size = symtab_hdr->sh_info * sizeof (bfd_vma); 798 local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); 799 800 if (local_got_offsets == NULL) 801 goto fail; 802 803 elf_local_got_offsets (abfd) = local_got_offsets; 804 805 for (i = 0; i < symtab_hdr->sh_info; i++) 806 local_got_offsets[i] = (bfd_vma) -1; 807 } 808 809 if (local_got_offsets[r_symndx] != (bfd_vma) -1) 810 /* We have already allocated space in the .got. */ 811 break; 812 813 local_got_offsets[r_symndx] = sgot->size; 814 815 if (bfd_link_executable (info)) 816 /* If we are generating a shared object, we need to 817 output a R_CR16_RELATIVE reloc so that the dynamic 818 linker can adjust this GOT entry. */ 819 srelgot->size += sizeof (Elf32_External_Rela); 820 } 821 822 sgot->size += 4; 823 break; 824 825 } 826 } 827 828 result = TRUE; 829 fail: 830 if (isymbuf != NULL) 831 free (isymbuf); 832 833 return result; 834} 835 836/* Perform a relocation as part of a final link. */ 837 838static bfd_reloc_status_type 839cr16_elf_final_link_relocate (reloc_howto_type *howto, 840 bfd *input_bfd, 841 bfd *output_bfd ATTRIBUTE_UNUSED, 842 asection *input_section, 843 bfd_byte *contents, 844 bfd_vma offset, 845 bfd_vma Rvalue, 846 bfd_vma addend, 847 struct elf_link_hash_entry * h, 848 unsigned long symndx ATTRIBUTE_UNUSED, 849 struct bfd_link_info *info ATTRIBUTE_UNUSED, 850 asection *sec ATTRIBUTE_UNUSED, 851 int is_local ATTRIBUTE_UNUSED) 852{ 853 unsigned short r_type = howto->type; 854 bfd_byte *hit_data = contents + offset; 855 bfd_vma reloc_bits, check, Rvalue1; 856 857 switch (r_type) 858 { 859 case R_CR16_IMM4: 860 case R_CR16_IMM20: 861 case R_CR16_ABS20: 862 break; 863 864 case R_CR16_IMM8: 865 case R_CR16_IMM16: 866 case R_CR16_IMM32: 867 case R_CR16_IMM32a: 868 case R_CR16_REGREL4: 869 case R_CR16_REGREL4a: 870 case R_CR16_REGREL14: 871 case R_CR16_REGREL14a: 872 case R_CR16_REGREL16: 873 case R_CR16_REGREL20: 874 case R_CR16_REGREL20a: 875 case R_CR16_GOT_REGREL20: 876 case R_CR16_GOTC_REGREL20: 877 case R_CR16_ABS24: 878 case R_CR16_DISP16: 879 case R_CR16_DISP24: 880 /* 'hit_data' is relative to the start of the instruction, not the 881 relocation offset. Advance it to account for the exact offset. */ 882 hit_data += 2; 883 break; 884 885 case R_CR16_NONE: 886 return bfd_reloc_ok; 887 break; 888 889 case R_CR16_DISP4: 890 if (is_local) 891 Rvalue += -1; 892 break; 893 894 case R_CR16_DISP8: 895 case R_CR16_DISP24a: 896 if (is_local) 897 Rvalue -= -1; 898 break; 899 900 case R_CR16_SWITCH8: 901 case R_CR16_SWITCH16: 902 case R_CR16_SWITCH32: 903 /* We only care about the addend, where the difference between 904 expressions is kept. */ 905 Rvalue = 0; 906 907 default: 908 break; 909 } 910 911 if (howto->pc_relative) 912 { 913 /* Subtract the address of the section containing the location. */ 914 Rvalue -= (input_section->output_section->vma 915 + input_section->output_offset); 916 /* Subtract the position of the location within the section. */ 917 Rvalue -= offset; 918 } 919 920 /* Add in supplied addend. */ 921 Rvalue += addend; 922 923 /* Complain if the bitfield overflows, whether it is considered 924 as signed or unsigned. */ 925 check = Rvalue >> howto->rightshift; 926 927 /* Assumes two's complement. This expression avoids 928 overflow if howto->bitsize is the number of bits in 929 bfd_vma. */ 930 reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; 931 932 /* For GOT and GOTC relocs no boundary checks applied. */ 933 if (!((r_type == R_CR16_GOT_REGREL20) 934 || (r_type == R_CR16_GOTC_REGREL20))) 935 { 936 if (((bfd_vma) check & ~reloc_bits) != 0 937 && (((bfd_vma) check & ~reloc_bits) 938 != (-(bfd_vma) 1 & ~reloc_bits))) 939 { 940 /* The above right shift is incorrect for a signed 941 value. See if turning on the upper bits fixes the 942 overflow. */ 943 if (howto->rightshift && (bfd_signed_vma) Rvalue < 0) 944 { 945 check |= ((bfd_vma) - 1 946 & ~((bfd_vma) - 1 947 >> howto->rightshift)); 948 949 if (((bfd_vma) check & ~reloc_bits) 950 != (-(bfd_vma) 1 & ~reloc_bits)) 951 return bfd_reloc_overflow; 952 } 953 else 954 return bfd_reloc_overflow; 955 } 956 957 /* Drop unwanted bits from the value we are relocating to. */ 958 Rvalue >>= (bfd_vma) howto->rightshift; 959 960 /* Apply dst_mask to select only relocatable part of the insn. */ 961 Rvalue &= howto->dst_mask; 962 } 963 964 switch (howto->size) 965 { 966 case 0: 967 if (r_type == R_CR16_DISP8) 968 { 969 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 970 Rvalue = ((Rvalue1 & 0xf000) | ((Rvalue << 4) & 0xf00) 971 | (Rvalue1 & 0x00f0) | (Rvalue & 0xf)); 972 bfd_put_16 (input_bfd, Rvalue, hit_data); 973 } 974 else if (r_type == R_CR16_IMM4) 975 { 976 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 977 Rvalue = (((Rvalue1 & 0xff) << 8) | ((Rvalue << 4) & 0xf0) 978 | ((Rvalue1 & 0x0f00) >> 8)); 979 bfd_put_16 (input_bfd, Rvalue, hit_data); 980 } 981 else if (r_type == R_CR16_DISP4) 982 { 983 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 984 Rvalue = (Rvalue1 | ((Rvalue & 0xf) << 4)); 985 bfd_put_16 (input_bfd, Rvalue, hit_data); 986 } 987 else 988 { 989 bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data); 990 } 991 break; 992 993 case 1: 994 if (r_type == R_CR16_DISP16) 995 { 996 Rvalue |= (bfd_get_16 (input_bfd, hit_data)); 997 Rvalue = ((Rvalue & 0xfffe) | ((Rvalue >> 16) & 0x1)); 998 } 999 if (r_type == R_CR16_IMM16) 1000 { 1001 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 1002 1003 /* Add or subtract the offset value. */ 1004 if (Rvalue1 & 0x8000) 1005 Rvalue -= (~Rvalue1 + 1) & 0xffff; 1006 else 1007 Rvalue += Rvalue1; 1008 1009 /* Check for range. */ 1010 if ((long) Rvalue > 0xffff || (long) Rvalue < 0x0) 1011 return bfd_reloc_overflow; 1012 } 1013 1014 bfd_put_16 (input_bfd, Rvalue, hit_data); 1015 break; 1016 1017 case 2: 1018 if ((r_type == R_CR16_ABS20) || (r_type == R_CR16_IMM20)) 1019 { 1020 Rvalue1 = (bfd_get_16 (input_bfd, hit_data + 2) 1021 | (((bfd_get_16 (input_bfd, hit_data) & 0xf) <<16))); 1022 1023 /* Add or subtract the offset value. */ 1024 if (Rvalue1 & 0x80000) 1025 Rvalue -= (~Rvalue1 + 1) & 0xfffff; 1026 else 1027 Rvalue += Rvalue1; 1028 1029 /* Check for range. */ 1030 if ((long) Rvalue > 0xfffff || (long) Rvalue < 0x0) 1031 return bfd_reloc_overflow; 1032 1033 bfd_put_16 (input_bfd, ((bfd_get_16 (input_bfd, hit_data) & 0xfff0) 1034 | ((Rvalue >> 16) & 0xf)), hit_data); 1035 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1036 } 1037 else if (r_type == R_CR16_GOT_REGREL20) 1038 { 1039 asection *sgot = elf_hash_table (info)->sgot; 1040 1041 if (h != NULL) 1042 { 1043 bfd_vma off; 1044 1045 off = h->got.offset; 1046 BFD_ASSERT (off != (bfd_vma) -1); 1047 1048 if (! elf_hash_table (info)->dynamic_sections_created 1049 || SYMBOL_REFERENCES_LOCAL (info, h)) 1050 /* This is actually a static link, or it is a 1051 -Bsymbolic link and the symbol is defined 1052 locally, or the symbol was forced to be local 1053 because of a version file. We must initialize 1054 this entry in the global offset table. 1055 When doing a dynamic link, we create a .rela.got 1056 relocation entry to initialize the value. This 1057 is done in the finish_dynamic_symbol routine. */ 1058 bfd_put_32 (output_bfd, Rvalue, sgot->contents + off); 1059 1060 Rvalue = sgot->output_offset + off; 1061 } 1062 else 1063 { 1064 bfd_vma off; 1065 1066 off = elf_local_got_offsets (input_bfd)[symndx]; 1067 bfd_put_32 (output_bfd,Rvalue, sgot->contents + off); 1068 1069 Rvalue = sgot->output_offset + off; 1070 } 1071 1072 Rvalue += addend; 1073 1074 /* REVISIT: if ((long) Rvalue > 0xffffff || 1075 (long) Rvalue < -0x800000). */ 1076 if ((long) Rvalue > 0xffffff || (long) Rvalue < 0) 1077 return bfd_reloc_overflow; 1078 1079 1080 bfd_put_16 (input_bfd, (bfd_get_16 (input_bfd, hit_data)) 1081 | (((Rvalue >> 16) & 0xf) << 8), hit_data); 1082 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1083 1084 } 1085 else if (r_type == R_CR16_GOTC_REGREL20) 1086 { 1087 asection *sgot = elf_hash_table (info)->sgot; 1088 1089 if (h != NULL) 1090 { 1091 bfd_vma off; 1092 1093 off = h->got.offset; 1094 BFD_ASSERT (off != (bfd_vma) -1); 1095 1096 Rvalue >>=1; /* For code symbols. */ 1097 1098 if (! elf_hash_table (info)->dynamic_sections_created 1099 || SYMBOL_REFERENCES_LOCAL (info, h)) 1100 /* This is actually a static link, or it is a 1101 -Bsymbolic link and the symbol is defined 1102 locally, or the symbol was forced to be local 1103 because of a version file. We must initialize 1104 this entry in the global offset table. 1105 When doing a dynamic link, we create a .rela.got 1106 relocation entry to initialize the value. This 1107 is done in the finish_dynamic_symbol routine. */ 1108 bfd_put_32 (output_bfd, Rvalue, sgot->contents + off); 1109 1110 Rvalue = sgot->output_offset + off; 1111 } 1112 else 1113 { 1114 bfd_vma off; 1115 1116 off = elf_local_got_offsets (input_bfd)[symndx]; 1117 Rvalue >>= 1; 1118 bfd_put_32 (output_bfd,Rvalue, sgot->contents + off); 1119 Rvalue = sgot->output_offset + off; 1120 } 1121 1122 Rvalue += addend; 1123 1124 /* Check if any value in DISP. */ 1125 Rvalue1 =((bfd_get_32 (input_bfd, hit_data) >>16) 1126 | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16)); 1127 1128 /* Add or subtract the offset value. */ 1129 if (Rvalue1 & 0x80000) 1130 Rvalue -= (~Rvalue1 + 1) & 0xfffff; 1131 else 1132 Rvalue += Rvalue1; 1133 1134 /* Check for range. */ 1135 /* REVISIT: if ((long) Rvalue > 0xffffff 1136 || (long) Rvalue < -0x800000). */ 1137 if ((long) Rvalue > 0xffffff || (long) Rvalue < 0) 1138 return bfd_reloc_overflow; 1139 1140 bfd_put_16 (input_bfd, (bfd_get_16 (input_bfd, hit_data)) 1141 | (((Rvalue >> 16) & 0xf) << 8), hit_data); 1142 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1143 } 1144 else 1145 { 1146 if (r_type == R_CR16_ABS24) 1147 { 1148 Rvalue1 = ((bfd_get_32 (input_bfd, hit_data) >> 16) 1149 | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16) 1150 | (((bfd_get_32 (input_bfd, hit_data) & 0xf) <<20))); 1151 1152 /* Add or subtract the offset value. */ 1153 if (Rvalue1 & 0x800000) 1154 Rvalue -= (~Rvalue1 + 1) & 0xffffff; 1155 else 1156 Rvalue += Rvalue1; 1157 1158 /* Check for Range. */ 1159 if ((long) Rvalue > 0xffffff || (long) Rvalue < 0x0) 1160 return bfd_reloc_overflow; 1161 1162 Rvalue = ((((Rvalue >> 20) & 0xf) | (((Rvalue >> 16) & 0xf)<<8) 1163 | (bfd_get_32 (input_bfd, hit_data) & 0xf0f0)) 1164 | ((Rvalue & 0xffff) << 16)); 1165 } 1166 else if (r_type == R_CR16_DISP24) 1167 { 1168 Rvalue = ((((Rvalue >> 20)& 0xf) | (((Rvalue >>16) & 0xf)<<8) 1169 | (bfd_get_16 (input_bfd, hit_data))) 1170 | (((Rvalue & 0xfffe) | ((Rvalue >> 24) & 0x1)) << 16)); 1171 } 1172 else if ((r_type == R_CR16_IMM32) || (r_type == R_CR16_IMM32a)) 1173 { 1174 Rvalue1 =((((bfd_get_32 (input_bfd, hit_data)) >> 16) &0xffff) 1175 | (((bfd_get_32 (input_bfd, hit_data)) &0xffff)) << 16); 1176 1177 /* Add or subtract the offset value. */ 1178 if (Rvalue1 & 0x80000000) 1179 Rvalue -= (~Rvalue1 + 1) & 0xffffffff; 1180 else 1181 Rvalue += Rvalue1; 1182 1183 /* Check for range. */ 1184 if (Rvalue > 0xffffffff || (long) Rvalue < 0x0) 1185 return bfd_reloc_overflow; 1186 1187 Rvalue = (((Rvalue >> 16)& 0xffff) | (Rvalue & 0xffff) << 16); 1188 } 1189 else if (r_type == R_CR16_DISP24a) 1190 { 1191 Rvalue = (((Rvalue & 0xfffffe) | (Rvalue >> 23))); 1192 Rvalue = ((Rvalue >> 16) & 0xff) | ((Rvalue & 0xffff) << 16) 1193 | (bfd_get_32 (input_bfd, hit_data)); 1194 } 1195 else if ((r_type == R_CR16_REGREL20) 1196 || (r_type == R_CR16_REGREL20a)) 1197 { 1198 Rvalue1 = ((bfd_get_32 (input_bfd, hit_data) >> 16) 1199 | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16)); 1200 /* Add or subtract the offset value. */ 1201 if (Rvalue1 & 0x80000) 1202 Rvalue -= (~Rvalue1 + 1) & 0xfffff; 1203 else 1204 Rvalue += Rvalue1; 1205 1206 /* Check for range. */ 1207 if ((long) Rvalue > 0xfffff || (long) Rvalue < 0x0) 1208 return bfd_reloc_overflow; 1209 1210 Rvalue = (((((Rvalue >> 20)& 0xf) | (((Rvalue >>16) & 0xf)<<8) 1211 | ((Rvalue & 0xffff) << 16))) 1212 | (bfd_get_32 (input_bfd, hit_data) & 0xf0ff)); 1213 1214 } 1215 else if (r_type == R_CR16_NUM32) 1216 { 1217 Rvalue1 = (bfd_get_32 (input_bfd, hit_data)); 1218 1219 /* Add or subtract the offset value */ 1220 if (Rvalue1 & 0x80000000) 1221 Rvalue -= (~Rvalue1 + 1) & 0xffffffff; 1222 else 1223 Rvalue += Rvalue1; 1224 1225 /* Check for Ranga */ 1226 if (Rvalue > 0xffffffff) 1227 return bfd_reloc_overflow; 1228 } 1229 1230 bfd_put_32 (input_bfd, Rvalue, hit_data); 1231 } 1232 break; 1233 1234 default: 1235 return bfd_reloc_notsupported; 1236 } 1237 1238 return bfd_reloc_ok; 1239} 1240 1241/* Delete some bytes from a section while relaxing. */ 1242 1243static bfd_boolean 1244elf32_cr16_relax_delete_bytes (struct bfd_link_info *link_info, bfd *abfd, 1245 asection *sec, bfd_vma addr, int count) 1246{ 1247 Elf_Internal_Shdr *symtab_hdr; 1248 unsigned int sec_shndx; 1249 bfd_byte *contents; 1250 Elf_Internal_Rela *irel, *irelend; 1251 bfd_vma toaddr; 1252 Elf_Internal_Sym *isym; 1253 Elf_Internal_Sym *isymend; 1254 struct elf_link_hash_entry **sym_hashes; 1255 struct elf_link_hash_entry **end_hashes; 1256 struct elf_link_hash_entry **start_hashes; 1257 unsigned int symcount; 1258 1259 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); 1260 1261 contents = elf_section_data (sec)->this_hdr.contents; 1262 1263 toaddr = sec->size; 1264 1265 irel = elf_section_data (sec)->relocs; 1266 irelend = irel + sec->reloc_count; 1267 1268 /* Actually delete the bytes. */ 1269 memmove (contents + addr, contents + addr + count, 1270 (size_t) (toaddr - addr - count)); 1271 sec->size -= count; 1272 1273 /* Adjust all the relocs. */ 1274 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) 1275 /* Get the new reloc address. */ 1276 if ((irel->r_offset > addr && irel->r_offset < toaddr)) 1277 irel->r_offset -= count; 1278 1279 /* Adjust the local symbols defined in this section. */ 1280 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1281 isym = (Elf_Internal_Sym *) symtab_hdr->contents; 1282 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) 1283 { 1284 if (isym->st_shndx == sec_shndx 1285 && isym->st_value > addr 1286 && isym->st_value < toaddr) 1287 { 1288 /* Adjust the addend of SWITCH relocations in this section, 1289 which reference this local symbol. */ 1290#if 0 1291 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) 1292 { 1293 unsigned long r_symndx; 1294 Elf_Internal_Sym *rsym; 1295 bfd_vma addsym, subsym; 1296 1297 /* Skip if not a SWITCH relocation. */ 1298 if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH8 1299 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH16 1300 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH32) 1301 continue; 1302 1303 r_symndx = ELF32_R_SYM (irel->r_info); 1304 rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx; 1305 1306 /* Skip if not the local adjusted symbol. */ 1307 if (rsym != isym) 1308 continue; 1309 1310 addsym = isym->st_value; 1311 subsym = addsym - irel->r_addend; 1312 1313 /* Fix the addend only when -->> (addsym > addr >= subsym). */ 1314 if (subsym <= addr) 1315 irel->r_addend -= count; 1316 else 1317 continue; 1318 } 1319#endif 1320 1321 isym->st_value -= count; 1322 } 1323 } 1324 1325 /* Now adjust the global symbols defined in this section. */ 1326 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) 1327 - symtab_hdr->sh_info); 1328 sym_hashes = start_hashes = elf_sym_hashes (abfd); 1329 end_hashes = sym_hashes + symcount; 1330 1331 for (; sym_hashes < end_hashes; sym_hashes++) 1332 { 1333 struct elf_link_hash_entry *sym_hash = *sym_hashes; 1334 1335 /* The '--wrap SYMBOL' option is causing a pain when the object file, 1336 containing the definition of __wrap_SYMBOL, includes a direct 1337 call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference 1338 the same symbol (which is __wrap_SYMBOL), but still exist as two 1339 different symbols in 'sym_hashes', we don't want to adjust 1340 the global symbol __wrap_SYMBOL twice. 1341 This check is only relevant when symbols are being wrapped. */ 1342 if (link_info->wrap_hash != NULL) 1343 { 1344 struct elf_link_hash_entry **cur_sym_hashes; 1345 1346 /* Loop only over the symbols whom been already checked. */ 1347 for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes; 1348 cur_sym_hashes++) 1349 /* If the current symbol is identical to 'sym_hash', that means 1350 the symbol was already adjusted (or at least checked). */ 1351 if (*cur_sym_hashes == sym_hash) 1352 break; 1353 1354 /* Don't adjust the symbol again. */ 1355 if (cur_sym_hashes < sym_hashes) 1356 continue; 1357 } 1358 1359 if ((sym_hash->root.type == bfd_link_hash_defined 1360 || sym_hash->root.type == bfd_link_hash_defweak) 1361 && sym_hash->root.u.def.section == sec 1362 && sym_hash->root.u.def.value > addr 1363 && sym_hash->root.u.def.value < toaddr) 1364 sym_hash->root.u.def.value -= count; 1365 } 1366 1367 return TRUE; 1368} 1369 1370/* Relocate a CR16 ELF section. */ 1371 1372static bfd_boolean 1373elf32_cr16_relocate_section (bfd *output_bfd, struct bfd_link_info *info, 1374 bfd *input_bfd, asection *input_section, 1375 bfd_byte *contents, Elf_Internal_Rela *relocs, 1376 Elf_Internal_Sym *local_syms, 1377 asection **local_sections) 1378{ 1379 Elf_Internal_Shdr *symtab_hdr; 1380 struct elf_link_hash_entry **sym_hashes; 1381 Elf_Internal_Rela *rel, *relend; 1382 1383 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1384 sym_hashes = elf_sym_hashes (input_bfd); 1385 1386 rel = relocs; 1387 relend = relocs + input_section->reloc_count; 1388 for (; rel < relend; rel++) 1389 { 1390 int r_type; 1391 reloc_howto_type *howto; 1392 unsigned long r_symndx; 1393 Elf_Internal_Sym *sym; 1394 asection *sec; 1395 struct elf_link_hash_entry *h; 1396 bfd_vma relocation; 1397 bfd_reloc_status_type r; 1398 1399 r_symndx = ELF32_R_SYM (rel->r_info); 1400 r_type = ELF32_R_TYPE (rel->r_info); 1401 howto = cr16_elf_howto_table + (r_type); 1402 1403 h = NULL; 1404 sym = NULL; 1405 sec = NULL; 1406 if (r_symndx < symtab_hdr->sh_info) 1407 { 1408 sym = local_syms + r_symndx; 1409 sec = local_sections[r_symndx]; 1410 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1411 } 1412 else 1413 { 1414 bfd_boolean unresolved_reloc, warned, ignored; 1415 1416 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1417 r_symndx, symtab_hdr, sym_hashes, 1418 h, sec, relocation, 1419 unresolved_reloc, warned, ignored); 1420 } 1421 1422 if (sec != NULL && discarded_section (sec)) 1423 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1424 rel, 1, relend, howto, 0, contents); 1425 1426 if (bfd_link_relocatable (info)) 1427 continue; 1428 1429 r = cr16_elf_final_link_relocate (howto, input_bfd, output_bfd, 1430 input_section, 1431 contents, rel->r_offset, 1432 relocation, rel->r_addend, 1433 (struct elf_link_hash_entry *) h, 1434 r_symndx, 1435 info, sec, h == NULL); 1436 1437 if (r != bfd_reloc_ok) 1438 { 1439 const char *name; 1440 const char *msg = NULL; 1441 1442 if (h != NULL) 1443 name = h->root.root.string; 1444 else 1445 { 1446 name = (bfd_elf_string_from_elf_section 1447 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 1448 if (name == NULL || *name == '\0') 1449 name = bfd_section_name (input_bfd, sec); 1450 } 1451 1452 switch (r) 1453 { 1454 case bfd_reloc_overflow: 1455 (*info->callbacks->reloc_overflow) 1456 (info, (h ? &h->root : NULL), name, howto->name, 1457 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1458 break; 1459 1460 case bfd_reloc_undefined: 1461 (*info->callbacks->undefined_symbol) 1462 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 1463 break; 1464 1465 case bfd_reloc_outofrange: 1466 msg = _("internal error: out of range error"); 1467 goto common_error; 1468 1469 case bfd_reloc_notsupported: 1470 msg = _("internal error: unsupported relocation error"); 1471 goto common_error; 1472 1473 case bfd_reloc_dangerous: 1474 msg = _("internal error: dangerous error"); 1475 goto common_error; 1476 1477 default: 1478 msg = _("internal error: unknown error"); 1479 /* Fall through. */ 1480 1481 common_error: 1482 (*info->callbacks->warning) (info, msg, name, input_bfd, 1483 input_section, rel->r_offset); 1484 break; 1485 } 1486 } 1487 } 1488 1489 return TRUE; 1490} 1491 1492/* This is a version of bfd_generic_get_relocated_section_contents 1493 which uses elf32_cr16_relocate_section. */ 1494 1495static bfd_byte * 1496elf32_cr16_get_relocated_section_contents (bfd *output_bfd, 1497 struct bfd_link_info *link_info, 1498 struct bfd_link_order *link_order, 1499 bfd_byte *data, 1500 bfd_boolean relocatable, 1501 asymbol **symbols) 1502{ 1503 Elf_Internal_Shdr *symtab_hdr; 1504 asection *input_section = link_order->u.indirect.section; 1505 bfd *input_bfd = input_section->owner; 1506 asection **sections = NULL; 1507 Elf_Internal_Rela *internal_relocs = NULL; 1508 Elf_Internal_Sym *isymbuf = NULL; 1509 1510 /* We only need to handle the case of relaxing, or of having a 1511 particular set of section contents, specially. */ 1512 if (relocatable 1513 || elf_section_data (input_section)->this_hdr.contents == NULL) 1514 return bfd_generic_get_relocated_section_contents (output_bfd, link_info, 1515 link_order, data, 1516 relocatable, 1517 symbols); 1518 1519 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1520 1521 memcpy (data, elf_section_data (input_section)->this_hdr.contents, 1522 (size_t) input_section->size); 1523 1524 if ((input_section->flags & SEC_RELOC) != 0 1525 && input_section->reloc_count > 0) 1526 { 1527 Elf_Internal_Sym *isym; 1528 Elf_Internal_Sym *isymend; 1529 asection **secpp; 1530 bfd_size_type amt; 1531 1532 internal_relocs = _bfd_elf_link_read_relocs (input_bfd, input_section, 1533 NULL, NULL, FALSE); 1534 if (internal_relocs == NULL) 1535 goto error_return; 1536 1537 if (symtab_hdr->sh_info != 0) 1538 { 1539 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1540 if (isymbuf == NULL) 1541 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, 1542 symtab_hdr->sh_info, 0, 1543 NULL, NULL, NULL); 1544 if (isymbuf == NULL) 1545 goto error_return; 1546 } 1547 1548 amt = symtab_hdr->sh_info; 1549 amt *= sizeof (asection *); 1550 sections = bfd_malloc (amt); 1551 if (sections == NULL && amt != 0) 1552 goto error_return; 1553 1554 isymend = isymbuf + symtab_hdr->sh_info; 1555 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) 1556 { 1557 asection *isec; 1558 1559 if (isym->st_shndx == SHN_UNDEF) 1560 isec = bfd_und_section_ptr; 1561 else if (isym->st_shndx == SHN_ABS) 1562 isec = bfd_abs_section_ptr; 1563 else if (isym->st_shndx == SHN_COMMON) 1564 isec = bfd_com_section_ptr; 1565 else 1566 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); 1567 1568 *secpp = isec; 1569 } 1570 1571 if (! elf32_cr16_relocate_section (output_bfd, link_info, input_bfd, 1572 input_section, data, internal_relocs, 1573 isymbuf, sections)) 1574 goto error_return; 1575 1576 if (sections != NULL) 1577 free (sections); 1578 if (isymbuf != NULL 1579 && symtab_hdr->contents != (unsigned char *) isymbuf) 1580 free (isymbuf); 1581 if (elf_section_data (input_section)->relocs != internal_relocs) 1582 free (internal_relocs); 1583 } 1584 1585 return data; 1586 1587 error_return: 1588 if (sections != NULL) 1589 free (sections); 1590 if (isymbuf != NULL 1591 && symtab_hdr->contents != (unsigned char *) isymbuf) 1592 free (isymbuf); 1593 if (internal_relocs != NULL 1594 && elf_section_data (input_section)->relocs != internal_relocs) 1595 free (internal_relocs); 1596 return NULL; 1597} 1598 1599/* Assorted hash table functions. */ 1600 1601/* Initialize an entry in the link hash table. */ 1602 1603/* Create an entry in an CR16 ELF linker hash table. */ 1604 1605static struct bfd_hash_entry * 1606elf32_cr16_link_hash_newfunc (struct bfd_hash_entry *entry, 1607 struct bfd_hash_table *table, 1608 const char *string) 1609{ 1610 struct elf32_cr16_link_hash_entry *ret = 1611 (struct elf32_cr16_link_hash_entry *) entry; 1612 1613 /* Allocate the structure if it has not already been allocated by a 1614 subclass. */ 1615 if (ret == (struct elf32_cr16_link_hash_entry *) NULL) 1616 ret = ((struct elf32_cr16_link_hash_entry *) 1617 bfd_hash_allocate (table, 1618 sizeof (struct elf32_cr16_link_hash_entry))); 1619 if (ret == (struct elf32_cr16_link_hash_entry *) NULL) 1620 return (struct bfd_hash_entry *) ret; 1621 1622 /* Call the allocation method of the superclass. */ 1623 ret = ((struct elf32_cr16_link_hash_entry *) 1624 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 1625 table, string)); 1626 if (ret != (struct elf32_cr16_link_hash_entry *) NULL) 1627 { 1628 ret->direct_calls = 0; 1629 ret->stack_size = 0; 1630 ret->movm_args = 0; 1631 ret->movm_stack_size = 0; 1632 ret->flags = 0; 1633 ret->value = 0; 1634 } 1635 1636 return (struct bfd_hash_entry *) ret; 1637} 1638 1639/* Create an cr16 ELF linker hash table. */ 1640 1641static struct bfd_link_hash_table * 1642elf32_cr16_link_hash_table_create (bfd *abfd) 1643{ 1644 struct elf_link_hash_table *ret; 1645 bfd_size_type amt = sizeof (struct elf_link_hash_table); 1646 1647 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt); 1648 if (ret == (struct elf_link_hash_table *) NULL) 1649 return NULL; 1650 1651 if (!_bfd_elf_link_hash_table_init (ret, abfd, 1652 elf32_cr16_link_hash_newfunc, 1653 sizeof (struct elf32_cr16_link_hash_entry), 1654 GENERIC_ELF_DATA)) 1655 { 1656 free (ret); 1657 return NULL; 1658 } 1659 1660 return &ret->root; 1661} 1662 1663static unsigned long 1664elf_cr16_mach (flagword flags) 1665{ 1666 switch (flags) 1667 { 1668 case EM_CR16: 1669 default: 1670 return bfd_mach_cr16; 1671 } 1672} 1673 1674/* The final processing done just before writing out a CR16 ELF object 1675 file. This gets the CR16 architecture right based on the machine 1676 number. */ 1677 1678static void 1679_bfd_cr16_elf_final_write_processing (bfd *abfd, 1680 bfd_boolean linker ATTRIBUTE_UNUSED) 1681{ 1682 unsigned long val; 1683 switch (bfd_get_mach (abfd)) 1684 { 1685 default: 1686 case bfd_mach_cr16: 1687 val = EM_CR16; 1688 break; 1689 } 1690 1691 1692 elf_elfheader (abfd)->e_flags |= val; 1693} 1694 1695 1696static bfd_boolean 1697_bfd_cr16_elf_object_p (bfd *abfd) 1698{ 1699 bfd_default_set_arch_mach (abfd, bfd_arch_cr16, 1700 elf_cr16_mach (elf_elfheader (abfd)->e_flags)); 1701 return TRUE; 1702} 1703 1704/* Merge backend specific data from an object file to the output 1705 object file when linking. */ 1706 1707static bfd_boolean 1708_bfd_cr16_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 1709{ 1710 bfd *obfd = info->output_bfd; 1711 1712 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1713 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1714 return TRUE; 1715 1716 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) 1717 && bfd_get_mach (obfd) < bfd_get_mach (ibfd)) 1718 { 1719 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), 1720 bfd_get_mach (ibfd))) 1721 return FALSE; 1722 } 1723 1724 return TRUE; 1725} 1726 1727 1728/* This function handles relaxing for the CR16. 1729 1730 There's quite a few relaxing opportunites available on the CR16: 1731 1732 * bcond:24 -> bcond:16 1 byte 1733 * bcond:16 -> bcond:8 1 byte 1734 * arithmetic imm32 -> arithmetic imm20 12 bits 1735 * arithmetic imm20/imm16 -> arithmetic imm4 12/16 bits 1736 1737 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 1738 1739static bfd_boolean 1740elf32_cr16_relax_section (bfd *abfd, asection *sec, 1741 struct bfd_link_info *link_info, bfd_boolean *again) 1742{ 1743 Elf_Internal_Shdr *symtab_hdr; 1744 Elf_Internal_Rela *internal_relocs; 1745 Elf_Internal_Rela *irel, *irelend; 1746 bfd_byte *contents = NULL; 1747 Elf_Internal_Sym *isymbuf = NULL; 1748 1749 /* Assume nothing changes. */ 1750 *again = FALSE; 1751 1752 /* We don't have to do anything for a relocatable link, if 1753 this section does not have relocs, or if this is not a 1754 code section. */ 1755 if (bfd_link_relocatable (link_info) 1756 || (sec->flags & SEC_RELOC) == 0 1757 || sec->reloc_count == 0 1758 || (sec->flags & SEC_CODE) == 0) 1759 return TRUE; 1760 1761 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1762 1763 /* Get a copy of the native relocations. */ 1764 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, 1765 link_info->keep_memory); 1766 if (internal_relocs == NULL) 1767 goto error_return; 1768 1769 /* Walk through them looking for relaxing opportunities. */ 1770 irelend = internal_relocs + sec->reloc_count; 1771 for (irel = internal_relocs; irel < irelend; irel++) 1772 { 1773 bfd_vma symval; 1774 1775 /* If this isn't something that can be relaxed, then ignore 1776 this reloc. */ 1777 if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP16 1778 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP24 1779 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM32 1780 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM20 1781 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM16) 1782 continue; 1783 1784 /* Get the section contents if we haven't done so already. */ 1785 if (contents == NULL) 1786 { 1787 /* Get cached copy if it exists. */ 1788 if (elf_section_data (sec)->this_hdr.contents != NULL) 1789 contents = elf_section_data (sec)->this_hdr.contents; 1790 /* Go get them off disk. */ 1791 else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1792 goto error_return; 1793 } 1794 1795 /* Read this BFD's local symbols if we haven't done so already. */ 1796 if (isymbuf == NULL && symtab_hdr->sh_info != 0) 1797 { 1798 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1799 if (isymbuf == NULL) 1800 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 1801 symtab_hdr->sh_info, 0, 1802 NULL, NULL, NULL); 1803 if (isymbuf == NULL) 1804 goto error_return; 1805 } 1806 1807 /* Get the value of the symbol referred to by the reloc. */ 1808 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 1809 { 1810 /* A local symbol. */ 1811 Elf_Internal_Sym *isym; 1812 asection *sym_sec; 1813 1814 isym = isymbuf + ELF32_R_SYM (irel->r_info); 1815 if (isym->st_shndx == SHN_UNDEF) 1816 sym_sec = bfd_und_section_ptr; 1817 else if (isym->st_shndx == SHN_ABS) 1818 sym_sec = bfd_abs_section_ptr; 1819 else if (isym->st_shndx == SHN_COMMON) 1820 sym_sec = bfd_com_section_ptr; 1821 else 1822 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 1823 symval = (isym->st_value 1824 + sym_sec->output_section->vma 1825 + sym_sec->output_offset); 1826 } 1827 else 1828 { 1829 unsigned long indx; 1830 struct elf_link_hash_entry *h; 1831 1832 /* An external symbol. */ 1833 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 1834 h = elf_sym_hashes (abfd)[indx]; 1835 BFD_ASSERT (h != NULL); 1836 1837 if (h->root.type != bfd_link_hash_defined 1838 && h->root.type != bfd_link_hash_defweak) 1839 /* This appears to be a reference to an undefined 1840 symbol. Just ignore it--it will be caught by the 1841 regular reloc processing. */ 1842 continue; 1843 1844 symval = (h->root.u.def.value 1845 + h->root.u.def.section->output_section->vma 1846 + h->root.u.def.section->output_offset); 1847 } 1848 1849 /* For simplicity of coding, we are going to modify the section 1850 contents, the section relocs, and the BFD symbol table. We 1851 must tell the rest of the code not to free up this 1852 information. It would be possible to instead create a table 1853 of changes which have to be made, as is done in coff-mips.c; 1854 that would be more work, but would require less memory when 1855 the linker is run. */ 1856 1857 /* Try to turn a 24 branch/call into a 16bit relative 1858 branch/call. */ 1859 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP24) 1860 { 1861 bfd_vma value = symval; 1862 1863 /* Deal with pc-relative gunk. */ 1864 value -= (sec->output_section->vma + sec->output_offset); 1865 value -= irel->r_offset; 1866 value += irel->r_addend; 1867 1868 /* See if the value will fit in 16 bits, note the high value is 1869 0xfffe + 2 as the target will be two bytes closer if we are 1870 able to relax. */ 1871 if ((long) value < 0x10000 && (long) value > -0x10002) 1872 { 1873 unsigned int code; 1874 1875 /* Get the opcode. */ 1876 code = (unsigned int) bfd_get_32 (abfd, contents + irel->r_offset); 1877 1878 /* Verify it's a 'bcond' and fix the opcode. */ 1879 if ((code & 0xffff) == 0x0010) 1880 bfd_put_16 (abfd, 0x1800 | ((0xf & (code >> 20)) << 4), contents + irel->r_offset); 1881 else 1882 continue; 1883 1884 /* Note that we've changed the relocs, section contents, etc. */ 1885 elf_section_data (sec)->relocs = internal_relocs; 1886 elf_section_data (sec)->this_hdr.contents = contents; 1887 symtab_hdr->contents = (unsigned char *) isymbuf; 1888 1889 /* Fix the relocation's type. */ 1890 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1891 R_CR16_DISP16); 1892 1893 /* Delete two bytes of data. */ 1894 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1895 irel->r_offset + 2, 2)) 1896 goto error_return; 1897 1898 /* That will change things, so, we should relax again. 1899 Note that this is not required, and it may be slow. */ 1900 *again = TRUE; 1901 } 1902 } 1903 1904 /* Try to turn a 16bit pc-relative branch into an 1905 8bit pc-relative branch. */ 1906 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP16) 1907 { 1908 bfd_vma value = symval; 1909 1910 /* Deal with pc-relative gunk. */ 1911 value -= (sec->output_section->vma + sec->output_offset); 1912 value -= irel->r_offset; 1913 value += irel->r_addend; 1914 1915 /* See if the value will fit in 8 bits, note the high value is 1916 0xfc + 2 as the target will be two bytes closer if we are 1917 able to relax. */ 1918 /*if ((long) value < 0x1fa && (long) value > -0x100) REVISIT:range */ 1919 if ((long) value < 0xfa && (long) value > -0x100) 1920 { 1921 unsigned short code; 1922 1923 /* Get the opcode. */ 1924 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 1925 1926 /* Verify it's a 'bcond' and fix the opcode. */ 1927 if ((code & 0xff0f) == 0x1800) 1928 bfd_put_16 (abfd, (code & 0xf0f0), contents + irel->r_offset); 1929 else 1930 continue; 1931 1932 /* Note that we've changed the relocs, section contents, etc. */ 1933 elf_section_data (sec)->relocs = internal_relocs; 1934 elf_section_data (sec)->this_hdr.contents = contents; 1935 symtab_hdr->contents = (unsigned char *) isymbuf; 1936 1937 /* Fix the relocation's type. */ 1938 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1939 R_CR16_DISP8); 1940 1941 /* Delete two bytes of data. */ 1942 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1943 irel->r_offset + 2, 2)) 1944 goto error_return; 1945 1946 /* That will change things, so, we should relax again. 1947 Note that this is not required, and it may be slow. */ 1948 *again = TRUE; 1949 } 1950 } 1951 1952 /* Try to turn a 32-bit IMM address into a 20/16-bit IMM address */ 1953 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM32) 1954 { 1955 bfd_vma value = symval; 1956 unsigned short is_add_mov = 0; 1957 bfd_vma value1 = 0; 1958 1959 /* Get the existing value from the mcode */ 1960 value1 = ((bfd_get_32 (abfd, contents + irel->r_offset + 2) >> 16) 1961 |(((bfd_get_32 (abfd, contents + irel->r_offset + 2) & 0xffff) << 16))); 1962 1963 /* See if the value will fit in 20 bits. */ 1964 if ((long) (value + value1) < 0xfffff && (long) (value + value1) > 0) 1965 { 1966 unsigned short code; 1967 1968 /* Get the opcode. */ 1969 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 1970 1971 /* Verify it's a 'arithmetic ADDD or MOVD instruction'. 1972 For ADDD and MOVD only, convert to IMM32 -> IMM20. */ 1973 1974 if (((code & 0xfff0) == 0x0070) || ((code & 0xfff0) == 0x0020)) 1975 is_add_mov = 1; 1976 1977 if (is_add_mov) 1978 { 1979 /* Note that we've changed the relocs, section contents, 1980 etc. */ 1981 elf_section_data (sec)->relocs = internal_relocs; 1982 elf_section_data (sec)->this_hdr.contents = contents; 1983 symtab_hdr->contents = (unsigned char *) isymbuf; 1984 1985 /* Fix the opcode. */ 1986 if ((code & 0xfff0) == 0x0070) /* For movd. */ 1987 bfd_put_8 (abfd, 0x05, contents + irel->r_offset + 1); 1988 else /* code == 0x0020 for addd. */ 1989 bfd_put_8 (abfd, 0x04, contents + irel->r_offset + 1); 1990 1991 bfd_put_8 (abfd, (code & 0xf) << 4, contents + irel->r_offset); 1992 1993 /* If existing value is nagavive adjust approriately 1994 place the 16-20bits (ie 4 bit) in new opcode, 1995 as the 0xffffxxxx, the higher 2 byte values removed. */ 1996 if (value1 & 0x80000000) 1997 bfd_put_8 (abfd, (0x0f | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 1998 else 1999 bfd_put_8 (abfd, (((value1 >> 16)&0xf) | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2000 2001 /* Fix the relocation's type. */ 2002 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2003 R_CR16_IMM20); 2004 2005 /* Delete two bytes of data. */ 2006 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2007 irel->r_offset + 2, 2)) 2008 goto error_return; 2009 2010 /* That will change things, so, we should relax again. 2011 Note that this is not required, and it may be slow. */ 2012 *again = TRUE; 2013 } 2014 } 2015 2016 /* See if the value will fit in 16 bits. */ 2017 if ((!is_add_mov) 2018 && ((long)(value + value1) < 0x7fff && (long)(value + value1) > 0)) 2019 { 2020 unsigned short code; 2021 2022 /* Get the opcode. */ 2023 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 2024 2025 /* Note that we've changed the relocs, section contents, etc. */ 2026 elf_section_data (sec)->relocs = internal_relocs; 2027 elf_section_data (sec)->this_hdr.contents = contents; 2028 symtab_hdr->contents = (unsigned char *) isymbuf; 2029 2030 /* Fix the opcode. */ 2031 if ((code & 0xf0) == 0x70) /* For movd. */ 2032 bfd_put_8 (abfd, 0x54, contents + irel->r_offset + 1); 2033 else if ((code & 0xf0) == 0x20) /* For addd. */ 2034 bfd_put_8 (abfd, 0x60, contents + irel->r_offset + 1); 2035 else if ((code & 0xf0) == 0x90) /* For cmpd. */ 2036 bfd_put_8 (abfd, 0x56, contents + irel->r_offset + 1); 2037 else 2038 continue; 2039 2040 bfd_put_8 (abfd, 0xb0 | (code & 0xf), contents + irel->r_offset); 2041 2042 /* If existing value is nagavive adjust approriately 2043 place the 12-16bits (ie 4 bit) in new opcode, 2044 as the 0xfffffxxx, the higher 2 byte values removed. */ 2045 if (value1 & 0x80000000) 2046 bfd_put_8 (abfd, (0x0f | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2047 else 2048 bfd_put_16 (abfd, value1, contents + irel->r_offset + 2); 2049 2050 2051 /* Fix the relocation's type. */ 2052 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2053 R_CR16_IMM16); 2054 2055 /* Delete two bytes of data. */ 2056 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2057 irel->r_offset + 2, 2)) 2058 goto error_return; 2059 2060 /* That will change things, so, we should relax again. 2061 Note that this is not required, and it may be slow. */ 2062 *again = TRUE; 2063 } 2064 } 2065 2066#if 0 2067 /* Try to turn a 16bit immediate address into a 4bit 2068 immediate address. */ 2069 if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20) 2070 || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM16)) 2071 { 2072 bfd_vma value = symval; 2073 bfd_vma value1 = 0; 2074 2075 /* Get the existing value from the mcode */ 2076 value1 = ((bfd_get_16 (abfd, contents + irel->r_offset + 2) & 0xffff)); 2077 2078 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20) 2079 { 2080 value1 |= ((bfd_get_16 (abfd, contents + irel->r_offset + 1) & 0xf000) << 0x4); 2081 } 2082 2083 /* See if the value will fit in 4 bits. */ 2084 if ((((long) (value + value1)) < 0xf) 2085 && (((long) (value + value1)) > 0)) 2086 { 2087 unsigned short code; 2088 2089 /* Get the opcode. */ 2090 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 2091 2092 /* Note that we've changed the relocs, section contents, etc. */ 2093 elf_section_data (sec)->relocs = internal_relocs; 2094 elf_section_data (sec)->this_hdr.contents = contents; 2095 symtab_hdr->contents = (unsigned char *) isymbuf; 2096 2097 /* Fix the opcode. */ 2098 if (((code & 0x0f00) == 0x0400) || ((code & 0x0f00) == 0x0500)) 2099 { 2100 if ((code & 0x0f00) == 0x0400) /* For movd imm20. */ 2101 bfd_put_8 (abfd, 0x60, contents + irel->r_offset); 2102 else /* For addd imm20. */ 2103 bfd_put_8 (abfd, 0x54, contents + irel->r_offset); 2104 bfd_put_8 (abfd, (code & 0xf0) >> 4, contents + irel->r_offset + 1); 2105 } 2106 else 2107 { 2108 if ((code & 0xfff0) == 0x56b0) /* For cmpd imm16. */ 2109 bfd_put_8 (abfd, 0x56, contents + irel->r_offset); 2110 else if ((code & 0xfff0) == 0x54b0) /* For movd imm16. */ 2111 bfd_put_8 (abfd, 0x54, contents + irel->r_offset); 2112 else if ((code & 0xfff0) == 0x58b0) /* For movb imm16. */ 2113 bfd_put_8 (abfd, 0x58, contents + irel->r_offset); 2114 else if ((code & 0xfff0) == 0x5Ab0) /* For movw imm16. */ 2115 bfd_put_8 (abfd, 0x5A, contents + irel->r_offset); 2116 else if ((code & 0xfff0) == 0x60b0) /* For addd imm16. */ 2117 bfd_put_8 (abfd, 0x60, contents + irel->r_offset); 2118 else if ((code & 0xfff0) == 0x30b0) /* For addb imm16. */ 2119 bfd_put_8 (abfd, 0x30, contents + irel->r_offset); 2120 else if ((code & 0xfff0) == 0x2Cb0) /* For addub imm16. */ 2121 bfd_put_8 (abfd, 0x2C, contents + irel->r_offset); 2122 else if ((code & 0xfff0) == 0x32b0) /* For adduw imm16. */ 2123 bfd_put_8 (abfd, 0x32, contents + irel->r_offset); 2124 else if ((code & 0xfff0) == 0x38b0) /* For subb imm16. */ 2125 bfd_put_8 (abfd, 0x38, contents + irel->r_offset); 2126 else if ((code & 0xfff0) == 0x3Cb0) /* For subcb imm16. */ 2127 bfd_put_8 (abfd, 0x3C, contents + irel->r_offset); 2128 else if ((code & 0xfff0) == 0x3Fb0) /* For subcw imm16. */ 2129 bfd_put_8 (abfd, 0x3F, contents + irel->r_offset); 2130 else if ((code & 0xfff0) == 0x3Ab0) /* For subw imm16. */ 2131 bfd_put_8 (abfd, 0x3A, contents + irel->r_offset); 2132 else if ((code & 0xfff0) == 0x50b0) /* For cmpb imm16. */ 2133 bfd_put_8 (abfd, 0x50, contents + irel->r_offset); 2134 else if ((code & 0xfff0) == 0x52b0) /* For cmpw imm16. */ 2135 bfd_put_8 (abfd, 0x52, contents + irel->r_offset); 2136 else 2137 continue; 2138 2139 bfd_put_8 (abfd, (code & 0xf), contents + irel->r_offset + 1); 2140 } 2141 2142 /* Fix the relocation's type. */ 2143 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2144 R_CR16_IMM4); 2145 2146 /* Delete two bytes of data. */ 2147 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2148 irel->r_offset + 2, 2)) 2149 goto error_return; 2150 2151 /* That will change things, so, we should relax again. 2152 Note that this is not required, and it may be slow. */ 2153 *again = TRUE; 2154 } 2155 } 2156#endif 2157 } 2158 2159 if (isymbuf != NULL 2160 && symtab_hdr->contents != (unsigned char *) isymbuf) 2161 { 2162 if (! link_info->keep_memory) 2163 free (isymbuf); 2164 else 2165 /* Cache the symbols for elf_link_input_bfd. */ 2166 symtab_hdr->contents = (unsigned char *) isymbuf; 2167 } 2168 2169 if (contents != NULL 2170 && elf_section_data (sec)->this_hdr.contents != contents) 2171 { 2172 if (! link_info->keep_memory) 2173 free (contents); 2174 else 2175 /* Cache the section contents for elf_link_input_bfd. */ 2176 elf_section_data (sec)->this_hdr.contents = contents; 2177 2178 } 2179 2180 if (internal_relocs != NULL 2181 && elf_section_data (sec)->relocs != internal_relocs) 2182 free (internal_relocs); 2183 2184 return TRUE; 2185 2186 error_return: 2187 if (isymbuf != NULL 2188 && symtab_hdr->contents != (unsigned char *) isymbuf) 2189 free (isymbuf); 2190 if (contents != NULL 2191 && elf_section_data (sec)->this_hdr.contents != contents) 2192 free (contents); 2193 if (internal_relocs != NULL 2194 && elf_section_data (sec)->relocs != internal_relocs) 2195 free (internal_relocs); 2196 2197 return FALSE; 2198} 2199 2200static asection * 2201elf32_cr16_gc_mark_hook (asection *sec, 2202 struct bfd_link_info *info, 2203 Elf_Internal_Rela *rel, 2204 struct elf_link_hash_entry *h, 2205 Elf_Internal_Sym *sym) 2206{ 2207 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2208} 2209 2210/* Update the got entry reference counts for the section being removed. */ 2211 2212static bfd_boolean 2213elf32_cr16_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, 2214 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2215 asection *sec ATTRIBUTE_UNUSED, 2216 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 2217{ 2218 /* We don't support garbage collection of GOT and PLT relocs yet. */ 2219 return TRUE; 2220} 2221 2222/* Create dynamic sections when linking against a dynamic object. */ 2223 2224static bfd_boolean 2225_bfd_cr16_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 2226{ 2227 flagword flags; 2228 asection * s; 2229 const struct elf_backend_data * bed = get_elf_backend_data (abfd); 2230 struct elf_link_hash_table *htab = elf_hash_table (info); 2231 int ptralign = 0; 2232 2233 switch (bed->s->arch_size) 2234 { 2235 case 16: 2236 ptralign = 1; 2237 break; 2238 2239 case 32: 2240 ptralign = 2; 2241 break; 2242 2243 default: 2244 bfd_set_error (bfd_error_bad_value); 2245 return FALSE; 2246 } 2247 2248 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and 2249 .rel[a].bss sections. */ 2250 2251 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 2252 | SEC_LINKER_CREATED); 2253 2254 s = bfd_make_section_anyway_with_flags (abfd, 2255 (bed->default_use_rela_p 2256 ? ".rela.plt" : ".rel.plt"), 2257 flags | SEC_READONLY); 2258 htab->srelplt = s; 2259 if (s == NULL 2260 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2261 return FALSE; 2262 2263 if (! _bfd_cr16_elf_create_got_section (abfd, info)) 2264 return FALSE; 2265 2266 if (bed->want_dynbss) 2267 { 2268 /* The .dynbss section is a place to put symbols which are defined 2269 by dynamic objects, are referenced by regular objects, and are 2270 not functions. We must allocate space for them in the process 2271 image and use a R_*_COPY reloc to tell the dynamic linker to 2272 initialize them at run time. The linker script puts the .dynbss 2273 section into the .bss section of the final image. */ 2274 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss", 2275 SEC_ALLOC | SEC_LINKER_CREATED); 2276 if (s == NULL) 2277 return FALSE; 2278 2279 /* The .rel[a].bss section holds copy relocs. This section is not 2280 normally needed. We need to create it here, though, so that the 2281 linker will map it to an output section. We can't just create it 2282 only if we need it, because we will not know whether we need it 2283 until we have seen all the input files, and the first time the 2284 main linker code calls BFD after examining all the input files 2285 (size_dynamic_sections) the input sections have already been 2286 mapped to the output sections. If the section turns out not to 2287 be needed, we can discard it later. We will never need this 2288 section when generating a shared object, since they do not use 2289 copy relocs. */ 2290 if (! bfd_link_executable (info)) 2291 { 2292 s = bfd_make_section_anyway_with_flags (abfd, 2293 (bed->default_use_rela_p 2294 ? ".rela.bss" : ".rel.bss"), 2295 flags | SEC_READONLY); 2296 if (s == NULL 2297 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2298 return FALSE; 2299 } 2300 } 2301 2302 return TRUE; 2303} 2304 2305/* Adjust a symbol defined by a dynamic object and referenced by a 2306 regular object. The current definition is in some section of the 2307 dynamic object, but we're not including those sections. We have to 2308 change the definition to something the rest of the link can 2309 understand. */ 2310 2311static bfd_boolean 2312_bfd_cr16_elf_adjust_dynamic_symbol (struct bfd_link_info * info, 2313 struct elf_link_hash_entry * h) 2314{ 2315 bfd * dynobj; 2316 asection * s; 2317 2318 dynobj = elf_hash_table (info)->dynobj; 2319 2320 /* Make sure we know what is going on here. */ 2321 BFD_ASSERT (dynobj != NULL 2322 && (h->needs_plt 2323 || h->u.weakdef != NULL 2324 || (h->def_dynamic 2325 && h->ref_regular 2326 && !h->def_regular))); 2327 2328 /* If this is a function, put it in the procedure linkage table. We 2329 will fill in the contents of the procedure linkage table later, 2330 when we know the address of the .got section. */ 2331 if (h->type == STT_FUNC 2332 || h->needs_plt) 2333 { 2334 if (! bfd_link_executable (info) 2335 && !h->def_dynamic 2336 && !h->ref_dynamic) 2337 { 2338 /* This case can occur if we saw a PLT reloc in an input 2339 file, but the symbol was never referred to by a dynamic 2340 object. In such a case, we don't actually need to build 2341 a procedure linkage table, and we can just do a REL32 2342 reloc instead. */ 2343 BFD_ASSERT (h->needs_plt); 2344 return TRUE; 2345 } 2346 2347 /* Make sure this symbol is output as a dynamic symbol. */ 2348 if (h->dynindx == -1) 2349 { 2350 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2351 return FALSE; 2352 } 2353 2354 /* We also need to make an entry in the .got.plt section, which 2355 will be placed in the .got section by the linker script. */ 2356 2357 s = elf_hash_table (info)->sgotplt; 2358 BFD_ASSERT (s != NULL); 2359 s->size += 4; 2360 2361 /* We also need to make an entry in the .rela.plt section. */ 2362 2363 s = elf_hash_table (info)->srelplt; 2364 BFD_ASSERT (s != NULL); 2365 s->size += sizeof (Elf32_External_Rela); 2366 2367 return TRUE; 2368 } 2369 2370 /* If this is a weak symbol, and there is a real definition, the 2371 processor independent code will have arranged for us to see the 2372 real definition first, and we can just use the same value. */ 2373 if (h->u.weakdef != NULL) 2374 { 2375 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 2376 || h->u.weakdef->root.type == bfd_link_hash_defweak); 2377 h->root.u.def.section = h->u.weakdef->root.u.def.section; 2378 h->root.u.def.value = h->u.weakdef->root.u.def.value; 2379 return TRUE; 2380 } 2381 2382 /* This is a reference to a symbol defined by a dynamic object which 2383 is not a function. */ 2384 2385 /* If we are creating a shared library, we must presume that the 2386 only references to the symbol are via the global offset table. 2387 For such cases we need not do anything here; the relocations will 2388 be handled correctly by relocate_section. */ 2389 if (bfd_link_executable (info)) 2390 return TRUE; 2391 2392 /* If there are no references to this symbol that do not use the 2393 GOT, we don't need to generate a copy reloc. */ 2394 if (!h->non_got_ref) 2395 return TRUE; 2396 2397 /* We must allocate the symbol in our .dynbss section, which will 2398 become part of the .bss section of the executable. There will be 2399 an entry for this symbol in the .dynsym section. The dynamic 2400 object will contain position independent code, so all references 2401 from the dynamic object to this symbol will go through the global 2402 offset table. The dynamic linker will use the .dynsym entry to 2403 determine the address it must put in the global offset table, so 2404 both the dynamic object and the regular object will refer to the 2405 same memory location for the variable. */ 2406 2407 s = bfd_get_linker_section (dynobj, ".dynbss"); 2408 BFD_ASSERT (s != NULL); 2409 2410 /* We must generate a R_CR16_COPY reloc to tell the dynamic linker to 2411 copy the initial value out of the dynamic object and into the 2412 runtime process image. We need to remember the offset into the 2413 .rela.bss section we are going to use. */ 2414 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 2415 { 2416 asection * srel; 2417 2418 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 2419 BFD_ASSERT (srel != NULL); 2420 srel->size += sizeof (Elf32_External_Rela); 2421 h->needs_copy = 1; 2422 } 2423 2424 return _bfd_elf_adjust_dynamic_copy (info, h, s); 2425} 2426 2427/* Set the sizes of the dynamic sections. */ 2428 2429static bfd_boolean 2430_bfd_cr16_elf_size_dynamic_sections (bfd * output_bfd, 2431 struct bfd_link_info * info) 2432{ 2433 bfd * dynobj; 2434 asection * s; 2435 bfd_boolean plt; 2436 bfd_boolean relocs; 2437 bfd_boolean reltext; 2438 2439 dynobj = elf_hash_table (info)->dynobj; 2440 BFD_ASSERT (dynobj != NULL); 2441 2442 if (elf_hash_table (info)->dynamic_sections_created) 2443 { 2444 /* Set the contents of the .interp section to the interpreter. */ 2445 if (bfd_link_executable (info) && !info->nointerp) 2446 { 2447#if 0 2448 s = bfd_get_linker_section (dynobj, ".interp"); 2449 BFD_ASSERT (s != NULL); 2450 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2451 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2452#endif 2453 } 2454 } 2455 else 2456 { 2457 /* We may have created entries in the .rela.got section. 2458 However, if we are not creating the dynamic sections, we will 2459 not actually use these entries. Reset the size of .rela.got, 2460 which will cause it to get stripped from the output file 2461 below. */ 2462 s = elf_hash_table (info)->srelgot; 2463 if (s != NULL) 2464 s->size = 0; 2465 } 2466 2467 /* The check_relocs and adjust_dynamic_symbol entry points have 2468 determined the sizes of the various dynamic sections. Allocate 2469 memory for them. */ 2470 plt = FALSE; 2471 relocs = FALSE; 2472 reltext = FALSE; 2473 for (s = dynobj->sections; s != NULL; s = s->next) 2474 { 2475 const char * name; 2476 2477 if ((s->flags & SEC_LINKER_CREATED) == 0) 2478 continue; 2479 2480 /* It's OK to base decisions on the section name, because none 2481 of the dynobj section names depend upon the input files. */ 2482 name = bfd_get_section_name (dynobj, s); 2483 2484 if (strcmp (name, ".plt") == 0) 2485 { 2486 /* Remember whether there is a PLT. */ 2487 plt = s->size != 0; 2488 } 2489 else if (CONST_STRNEQ (name, ".rela")) 2490 { 2491 if (s->size != 0) 2492 { 2493 asection * target; 2494 2495 /* Remember whether there are any reloc sections other 2496 than .rela.plt. */ 2497 if (strcmp (name, ".rela.plt") != 0) 2498 { 2499 const char * outname; 2500 2501 relocs = TRUE; 2502 2503 /* If this relocation section applies to a read only 2504 section, then we probably need a DT_TEXTREL 2505 entry. The entries in the .rela.plt section 2506 really apply to the .got section, which we 2507 created ourselves and so know is not readonly. */ 2508 outname = bfd_get_section_name (output_bfd, 2509 s->output_section); 2510 target = bfd_get_section_by_name (output_bfd, outname + 5); 2511 if (target != NULL 2512 && (target->flags & SEC_READONLY) != 0 2513 && (target->flags & SEC_ALLOC) != 0) 2514 reltext = TRUE; 2515 } 2516 2517 /* We use the reloc_count field as a counter if we need 2518 to copy relocs into the output file. */ 2519 s->reloc_count = 0; 2520 } 2521 } 2522 else if (! CONST_STRNEQ (name, ".got") 2523 && strcmp (name, ".dynbss") != 0) 2524 /* It's not one of our sections, so don't allocate space. */ 2525 continue; 2526 2527 if (s->size == 0) 2528 { 2529 /* If we don't need this section, strip it from the 2530 output file. This is mostly to handle .rela.bss and 2531 .rela.plt. We must create both sections in 2532 create_dynamic_sections, because they must be created 2533 before the linker maps input sections to output 2534 sections. The linker does that before 2535 adjust_dynamic_symbol is called, and it is that 2536 function which decides whether anything needs to go 2537 into these sections. */ 2538 s->flags |= SEC_EXCLUDE; 2539 continue; 2540 } 2541 2542 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2543 continue; 2544 2545 /* Allocate memory for the section contents. We use bfd_zalloc 2546 here in case unused entries are not reclaimed before the 2547 section's contents are written out. This should not happen, 2548 but this way if it does, we get a R_CR16_NONE reloc 2549 instead of garbage. */ 2550 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2551 if (s->contents == NULL) 2552 return FALSE; 2553 } 2554 2555 if (elf_hash_table (info)->dynamic_sections_created) 2556 { 2557 /* Add some entries to the .dynamic section. We fill in the 2558 values later, in _bfd_cr16_elf_finish_dynamic_sections, 2559 but we must add the entries now so that we get the correct 2560 size for the .dynamic section. The DT_DEBUG entry is filled 2561 in by the dynamic linker and used by the debugger. */ 2562 if (! bfd_link_executable (info)) 2563 { 2564 if (!_bfd_elf_add_dynamic_entry (info, DT_DEBUG, 0)) 2565 return FALSE; 2566 } 2567 2568 if (plt) 2569 { 2570 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0) 2571 || !_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0) 2572 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_RELA) 2573 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0)) 2574 return FALSE; 2575 } 2576 2577 if (relocs) 2578 { 2579 if (!_bfd_elf_add_dynamic_entry (info, DT_RELA, 0) 2580 || !_bfd_elf_add_dynamic_entry (info, DT_RELASZ, 0) 2581 || !_bfd_elf_add_dynamic_entry (info, DT_RELAENT, 2582 sizeof (Elf32_External_Rela))) 2583 return FALSE; 2584 } 2585 2586 if (reltext) 2587 { 2588 if (!_bfd_elf_add_dynamic_entry (info, DT_TEXTREL, 0)) 2589 return FALSE; 2590 } 2591 } 2592 2593 return TRUE; 2594} 2595 2596/* Finish up dynamic symbol handling. We set the contents of various 2597 dynamic sections here. */ 2598 2599static bfd_boolean 2600_bfd_cr16_elf_finish_dynamic_symbol (bfd * output_bfd, 2601 struct bfd_link_info * info, 2602 struct elf_link_hash_entry * h, 2603 Elf_Internal_Sym * sym) 2604{ 2605 bfd * dynobj; 2606 2607 dynobj = elf_hash_table (info)->dynobj; 2608 2609 if (h->got.offset != (bfd_vma) -1) 2610 { 2611 asection * sgot; 2612 asection * srel; 2613 Elf_Internal_Rela rel; 2614 2615 /* This symbol has an entry in the global offset table. Set it up. */ 2616 2617 sgot = elf_hash_table (info)->sgot; 2618 srel = elf_hash_table (info)->srelgot; 2619 BFD_ASSERT (sgot != NULL && srel != NULL); 2620 2621 rel.r_offset = (sgot->output_section->vma 2622 + sgot->output_offset 2623 + (h->got.offset & ~1)); 2624 2625 /* If this is a -Bsymbolic link, and the symbol is defined 2626 locally, we just want to emit a RELATIVE reloc. Likewise if 2627 the symbol was forced to be local because of a version file. 2628 The entry in the global offset table will already have been 2629 initialized in the relocate_section function. */ 2630 if (bfd_link_executable (info) 2631 && (info->symbolic || h->dynindx == -1) 2632 && h->def_regular) 2633 { 2634 rel.r_info = ELF32_R_INFO (0, R_CR16_GOT_REGREL20); 2635 rel.r_addend = (h->root.u.def.value 2636 + h->root.u.def.section->output_section->vma 2637 + h->root.u.def.section->output_offset); 2638 } 2639 else 2640 { 2641 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); 2642 rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20); 2643 rel.r_addend = 0; 2644 } 2645 2646 bfd_elf32_swap_reloca_out (output_bfd, &rel, 2647 (bfd_byte *) ((Elf32_External_Rela *) srel->contents 2648 + srel->reloc_count)); 2649 ++ srel->reloc_count; 2650 } 2651 2652 if (h->needs_copy) 2653 { 2654 asection * s; 2655 Elf_Internal_Rela rel; 2656 2657 /* This symbol needs a copy reloc. Set it up. */ 2658 BFD_ASSERT (h->dynindx != -1 2659 && (h->root.type == bfd_link_hash_defined 2660 || h->root.type == bfd_link_hash_defweak)); 2661 2662 s = bfd_get_linker_section (dynobj, ".rela.bss"); 2663 BFD_ASSERT (s != NULL); 2664 2665 rel.r_offset = (h->root.u.def.value 2666 + h->root.u.def.section->output_section->vma 2667 + h->root.u.def.section->output_offset); 2668 rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20); 2669 rel.r_addend = 0; 2670 bfd_elf32_swap_reloca_out (output_bfd, &rel, 2671 (bfd_byte *) ((Elf32_External_Rela *) s->contents 2672 + s->reloc_count)); 2673 ++ s->reloc_count; 2674 } 2675 2676 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 2677 if (h == elf_hash_table (info)->hdynamic 2678 || h == elf_hash_table (info)->hgot) 2679 sym->st_shndx = SHN_ABS; 2680 2681 return TRUE; 2682} 2683 2684/* Finish up the dynamic sections. */ 2685 2686static bfd_boolean 2687_bfd_cr16_elf_finish_dynamic_sections (bfd * output_bfd, 2688 struct bfd_link_info * info) 2689{ 2690 bfd * dynobj; 2691 asection * sgot; 2692 asection * sdyn; 2693 2694 dynobj = elf_hash_table (info)->dynobj; 2695 2696 sgot = elf_hash_table (info)->sgotplt; 2697 BFD_ASSERT (sgot != NULL); 2698 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 2699 2700 if (elf_hash_table (info)->dynamic_sections_created) 2701 { 2702 Elf32_External_Dyn * dyncon; 2703 Elf32_External_Dyn * dynconend; 2704 2705 BFD_ASSERT (sdyn != NULL); 2706 2707 dyncon = (Elf32_External_Dyn *) sdyn->contents; 2708 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 2709 2710 for (; dyncon < dynconend; dyncon++) 2711 { 2712 Elf_Internal_Dyn dyn; 2713 asection * s; 2714 2715 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 2716 2717 switch (dyn.d_tag) 2718 { 2719 default: 2720 break; 2721 2722 case DT_PLTGOT: 2723 s = elf_hash_table (info)->sgotplt; 2724 goto get_vma; 2725 2726 case DT_JMPREL: 2727 s = elf_hash_table (info)->srelplt; 2728 get_vma: 2729 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 2730 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2731 break; 2732 2733 case DT_PLTRELSZ: 2734 s = elf_hash_table (info)->srelplt; 2735 dyn.d_un.d_val = s->size; 2736 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2737 break; 2738 } 2739 } 2740 2741 } 2742 2743 /* Fill in the first three entries in the global offset table. */ 2744 if (sgot->size > 0) 2745 { 2746 if (sdyn == NULL) 2747 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2748 else 2749 bfd_put_32 (output_bfd, 2750 sdyn->output_section->vma + sdyn->output_offset, 2751 sgot->contents); 2752 } 2753 2754 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2755 2756 return TRUE; 2757} 2758 2759/* Given a .data.rel section and a .emreloc in-memory section, store 2760 relocation information into the .emreloc section which can be 2761 used at runtime to relocate the section. This is called by the 2762 linker when the --embedded-relocs switch is used. This is called 2763 after the add_symbols entry point has been called for all the 2764 objects, and before the final_link entry point is called. */ 2765 2766bfd_boolean 2767bfd_cr16_elf32_create_embedded_relocs (bfd *abfd, 2768 struct bfd_link_info *info, 2769 asection *datasec, 2770 asection *relsec, 2771 char **errmsg) 2772{ 2773 Elf_Internal_Shdr *symtab_hdr; 2774 Elf_Internal_Sym *isymbuf = NULL; 2775 Elf_Internal_Rela *internal_relocs = NULL; 2776 Elf_Internal_Rela *irel, *irelend; 2777 bfd_byte *p; 2778 bfd_size_type amt; 2779 2780 BFD_ASSERT (! bfd_link_relocatable (info)); 2781 2782 *errmsg = NULL; 2783 2784 if (datasec->reloc_count == 0) 2785 return TRUE; 2786 2787 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2788 2789 /* Get a copy of the native relocations. */ 2790 internal_relocs = (_bfd_elf_link_read_relocs 2791 (abfd, datasec, NULL, NULL, info->keep_memory)); 2792 if (internal_relocs == NULL) 2793 goto error_return; 2794 2795 amt = (bfd_size_type) datasec->reloc_count * 8; 2796 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 2797 if (relsec->contents == NULL) 2798 goto error_return; 2799 2800 p = relsec->contents; 2801 2802 irelend = internal_relocs + datasec->reloc_count; 2803 for (irel = internal_relocs; irel < irelend; irel++, p += 8) 2804 { 2805 asection *targetsec; 2806 2807 /* We are going to write a four byte longword into the runtime 2808 reloc section. The longword will be the address in the data 2809 section which must be relocated. It is followed by the name 2810 of the target section NUL-padded or truncated to 8 2811 characters. */ 2812 2813 /* We can only relocate absolute longword relocs at run time. */ 2814 if (!((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a) 2815 || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32))) 2816 { 2817 *errmsg = _("unsupported reloc type"); 2818 bfd_set_error (bfd_error_bad_value); 2819 goto error_return; 2820 } 2821 2822 /* Get the target section referred to by the reloc. */ 2823 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2824 { 2825 /* A local symbol. */ 2826 Elf_Internal_Sym *isym; 2827 2828 /* Read this BFD's local symbols if we haven't done so already. */ 2829 if (isymbuf == NULL) 2830 { 2831 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2832 if (isymbuf == NULL) 2833 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2834 symtab_hdr->sh_info, 0, 2835 NULL, NULL, NULL); 2836 if (isymbuf == NULL) 2837 goto error_return; 2838 } 2839 2840 isym = isymbuf + ELF32_R_SYM (irel->r_info); 2841 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2842 } 2843 else 2844 { 2845 unsigned long indx; 2846 struct elf_link_hash_entry *h; 2847 2848 /* An external symbol. */ 2849 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2850 h = elf_sym_hashes (abfd)[indx]; 2851 BFD_ASSERT (h != NULL); 2852 if (h->root.type == bfd_link_hash_defined 2853 || h->root.type == bfd_link_hash_defweak) 2854 targetsec = h->root.u.def.section; 2855 else 2856 targetsec = NULL; 2857 } 2858 2859 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 2860 memset (p + 4, 0, 4); 2861 if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a) 2862 && (targetsec != NULL) ) 2863 strncpy ((char *) p + 4, targetsec->output_section->name, 4); 2864 } 2865 2866 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 2867 free (isymbuf); 2868 if (internal_relocs != NULL 2869 && elf_section_data (datasec)->relocs != internal_relocs) 2870 free (internal_relocs); 2871 return TRUE; 2872 2873error_return: 2874 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 2875 free (isymbuf); 2876 if (internal_relocs != NULL 2877 && elf_section_data (datasec)->relocs != internal_relocs) 2878 free (internal_relocs); 2879 return FALSE; 2880} 2881 2882 2883/* Classify relocation types, such that combreloc can sort them 2884 properly. */ 2885 2886static enum elf_reloc_type_class 2887_bfd_cr16_elf_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 2888 const asection *rel_sec ATTRIBUTE_UNUSED, 2889 const Elf_Internal_Rela *rela) 2890{ 2891 switch ((int) ELF32_R_TYPE (rela->r_info)) 2892 { 2893 case R_CR16_GOT_REGREL20: 2894 case R_CR16_GOTC_REGREL20: 2895 return reloc_class_relative; 2896 default: 2897 return reloc_class_normal; 2898 } 2899} 2900 2901/* Definitions for setting CR16 target vector. */ 2902#define TARGET_LITTLE_SYM cr16_elf32_vec 2903#define TARGET_LITTLE_NAME "elf32-cr16" 2904#define ELF_ARCH bfd_arch_cr16 2905#define ELF_MACHINE_CODE EM_CR16 2906#define ELF_MACHINE_ALT1 EM_CR16_OLD 2907#define ELF_MAXPAGESIZE 0x1 2908#define elf_symbol_leading_char '_' 2909 2910#define bfd_elf32_bfd_reloc_type_lookup elf_cr16_reloc_type_lookup 2911#define bfd_elf32_bfd_reloc_name_lookup elf_cr16_reloc_name_lookup 2912#define elf_info_to_howto elf_cr16_info_to_howto 2913#define elf_info_to_howto_rel 0 2914#define elf_backend_relocate_section elf32_cr16_relocate_section 2915#define bfd_elf32_bfd_relax_section elf32_cr16_relax_section 2916#define bfd_elf32_bfd_get_relocated_section_contents \ 2917 elf32_cr16_get_relocated_section_contents 2918#define elf_backend_gc_mark_hook elf32_cr16_gc_mark_hook 2919#define elf_backend_gc_sweep_hook elf32_cr16_gc_sweep_hook 2920#define elf_backend_can_gc_sections 1 2921#define elf_backend_rela_normal 1 2922#define elf_backend_check_relocs cr16_elf_check_relocs 2923/* So we can set bits in e_flags. */ 2924#define elf_backend_final_write_processing \ 2925 _bfd_cr16_elf_final_write_processing 2926#define elf_backend_object_p _bfd_cr16_elf_object_p 2927 2928#define bfd_elf32_bfd_merge_private_bfd_data \ 2929 _bfd_cr16_elf_merge_private_bfd_data 2930 2931 2932#define bfd_elf32_bfd_link_hash_table_create \ 2933 elf32_cr16_link_hash_table_create 2934 2935#define elf_backend_create_dynamic_sections \ 2936 _bfd_cr16_elf_create_dynamic_sections 2937#define elf_backend_adjust_dynamic_symbol \ 2938 _bfd_cr16_elf_adjust_dynamic_symbol 2939#define elf_backend_size_dynamic_sections \ 2940 _bfd_cr16_elf_size_dynamic_sections 2941#define elf_backend_omit_section_dynsym \ 2942 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 2943#define elf_backend_finish_dynamic_symbol \ 2944 _bfd_cr16_elf_finish_dynamic_symbol 2945#define elf_backend_finish_dynamic_sections \ 2946 _bfd_cr16_elf_finish_dynamic_sections 2947 2948#define elf_backend_reloc_type_class _bfd_cr16_elf_reloc_type_class 2949 2950 2951#define elf_backend_want_got_plt 1 2952#define elf_backend_plt_readonly 1 2953#define elf_backend_want_plt_sym 0 2954#define elf_backend_got_header_size 12 2955#define elf_backend_dtrel_excludes_plt 1 2956 2957#include "elf32-target.h" 2958