1/* BFD back-end for National Semiconductor's CR16 ELF 2 Copyright 2007, 2008, 2009, 2010 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 2, /* size */ 119 32, /* 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 int ptralign; 586 587 /* This function may be called more than once. */ 588 if (bfd_get_section_by_name (abfd, ".got") != NULL) 589 return TRUE; 590 591 switch (bed->s->arch_size) 592 { 593 case 16: 594 ptralign = 1; 595 break; 596 597 case 32: 598 ptralign = 2; 599 break; 600 601 default: 602 bfd_set_error (bfd_error_bad_value); 603 return FALSE; 604 } 605 606 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 607 | SEC_LINKER_CREATED); 608 609 s = bfd_make_section_with_flags (abfd, ".got", flags); 610 if (s == NULL 611 || ! bfd_set_section_alignment (abfd, s, ptralign)) 612 return FALSE; 613 614 if (bed->want_got_plt) 615 { 616 s = bfd_make_section_with_flags (abfd, ".got.plt", flags); 617 if (s == NULL 618 || ! bfd_set_section_alignment (abfd, s, ptralign)) 619 return FALSE; 620 } 621 622 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got 623 (or .got.plt) section. We don't do this in the linker script 624 because we don't want to define the symbol if we are not creating 625 a global offset table. */ 626 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_"); 627 elf_hash_table (info)->hgot = h; 628 if (h == NULL) 629 return FALSE; 630 631 /* The first bit of the global offset table is the header. */ 632 s->size += bed->got_header_size; 633 634 return TRUE; 635} 636 637 638/* Retrieve a howto ptr using a BFD reloc_code. */ 639 640static reloc_howto_type * 641elf_cr16_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 642 bfd_reloc_code_real_type code) 643{ 644 unsigned int i; 645 646 for (i = 0; i < R_CR16_MAX; i++) 647 if (code == cr16_reloc_map[i].bfd_reloc_enum) 648 return &cr16_elf_howto_table[cr16_reloc_map[i].cr16_reloc_type]; 649 650 _bfd_error_handler ("Unsupported CR16 relocation type: 0x%x\n", code); 651 return NULL; 652} 653 654static reloc_howto_type * 655elf_cr16_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 656 const char *r_name) 657{ 658 unsigned int i; 659 660 for (i = 0; ARRAY_SIZE (cr16_elf_howto_table); i++) 661 if (cr16_elf_howto_table[i].name != NULL 662 && strcasecmp (cr16_elf_howto_table[i].name, r_name) == 0) 663 return cr16_elf_howto_table + i; 664 665 return NULL; 666} 667 668/* Retrieve a howto ptr using an internal relocation entry. */ 669 670static void 671elf_cr16_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, 672 Elf_Internal_Rela *dst) 673{ 674 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 675 676 BFD_ASSERT (r_type < (unsigned int) R_CR16_MAX); 677 cache_ptr->howto = cr16_elf_howto_table + r_type; 678} 679 680/* Look through the relocs for a section during the first phase. 681 Since we don't do .gots or .plts, we just need to consider the 682 virtual table relocs for gc. */ 683 684static bfd_boolean 685cr16_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, 686 const Elf_Internal_Rela *relocs) 687{ 688 Elf_Internal_Shdr *symtab_hdr; 689 Elf_Internal_Sym * isymbuf = NULL; 690 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 691 const Elf_Internal_Rela *rel; 692 const Elf_Internal_Rela *rel_end; 693 bfd * dynobj; 694 bfd_vma * local_got_offsets; 695 asection * sgot; 696 asection * srelgot; 697 698 sgot = NULL; 699 srelgot = NULL; 700 bfd_boolean result = FALSE; 701 702 if (info->relocatable) 703 return TRUE; 704 705 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 706 sym_hashes = elf_sym_hashes (abfd); 707 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); 708 if (!elf_bad_symtab (abfd)) 709 sym_hashes_end -= symtab_hdr->sh_info; 710 711 dynobj = elf_hash_table (info)->dynobj; 712 local_got_offsets = elf_local_got_offsets (abfd); 713 rel_end = relocs + sec->reloc_count; 714 for (rel = relocs; rel < rel_end; rel++) 715 { 716 struct elf_link_hash_entry *h; 717 unsigned long r_symndx; 718 719 r_symndx = ELF32_R_SYM (rel->r_info); 720 if (r_symndx < symtab_hdr->sh_info) 721 h = NULL; 722 else 723 { 724 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 725 while (h->root.type == bfd_link_hash_indirect 726 || h->root.type == bfd_link_hash_warning) 727 h = (struct elf_link_hash_entry *) h->root.u.i.link; 728 } 729 730 /* Some relocs require a global offset table. */ 731 if (dynobj == NULL) 732 { 733 switch (ELF32_R_TYPE (rel->r_info)) 734 { 735 case R_CR16_GOT_REGREL20: 736 case R_CR16_GOTC_REGREL20: 737 elf_hash_table (info)->dynobj = dynobj = abfd; 738 if (! _bfd_cr16_elf_create_got_section (dynobj, info)) 739 goto fail; 740 break; 741 742 default: 743 break; 744 } 745 } 746 747 switch (ELF32_R_TYPE (rel->r_info)) 748 { 749 case R_CR16_GOT_REGREL20: 750 case R_CR16_GOTC_REGREL20: 751 /* This symbol requires a global offset table entry. */ 752 753 if (sgot == NULL) 754 { 755 sgot = bfd_get_section_by_name (dynobj, ".got"); 756 BFD_ASSERT (sgot != NULL); 757 } 758 759 if (srelgot == NULL 760 && (h != NULL || info->executable)) 761 { 762 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 763 if (srelgot == NULL) 764 { 765 srelgot = bfd_make_section_with_flags (dynobj, 766 ".rela.got", 767 (SEC_ALLOC 768 | SEC_LOAD 769 | SEC_HAS_CONTENTS 770 | SEC_IN_MEMORY 771 | SEC_LINKER_CREATED 772 | SEC_READONLY)); 773 if (srelgot == NULL 774 || ! bfd_set_section_alignment (dynobj, srelgot, 2)) 775 goto fail; 776 } 777 } 778 779 if (h != NULL) 780 { 781 if (h->got.offset != (bfd_vma) -1) 782 /* We have already allocated space in the .got. */ 783 break; 784 785 h->got.offset = sgot->size; 786 787 /* Make sure this symbol is output as a dynamic symbol. */ 788 if (h->dynindx == -1) 789 { 790 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 791 goto fail; 792 } 793 794 srelgot->size += sizeof (Elf32_External_Rela); 795 } 796 else 797 { 798 /* This is a global offset table entry for a local 799 symbol. */ 800 if (local_got_offsets == NULL) 801 { 802 size_t size; 803 unsigned int i; 804 805 size = symtab_hdr->sh_info * sizeof (bfd_vma); 806 local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); 807 808 if (local_got_offsets == NULL) 809 goto fail; 810 811 elf_local_got_offsets (abfd) = local_got_offsets; 812 813 for (i = 0; i < symtab_hdr->sh_info; i++) 814 local_got_offsets[i] = (bfd_vma) -1; 815 } 816 817 if (local_got_offsets[r_symndx] != (bfd_vma) -1) 818 /* We have already allocated space in the .got. */ 819 break; 820 821 local_got_offsets[r_symndx] = sgot->size; 822 823 if (info->executable) 824 /* If we are generating a shared object, we need to 825 output a R_CR16_RELATIVE reloc so that the dynamic 826 linker can adjust this GOT entry. */ 827 srelgot->size += sizeof (Elf32_External_Rela); 828 } 829 830 sgot->size += 4; 831 break; 832 833 } 834 } 835 836 result = TRUE; 837 fail: 838 if (isymbuf != NULL) 839 free (isymbuf); 840 841 return result; 842} 843 844/* Perform a relocation as part of a final link. */ 845 846static bfd_reloc_status_type 847cr16_elf_final_link_relocate (reloc_howto_type *howto, 848 bfd *input_bfd, 849 bfd *output_bfd ATTRIBUTE_UNUSED, 850 asection *input_section, 851 bfd_byte *contents, 852 bfd_vma offset, 853 bfd_vma Rvalue, 854 bfd_vma addend, 855 struct elf_link_hash_entry * h, 856 unsigned long symndx ATTRIBUTE_UNUSED, 857 struct bfd_link_info *info ATTRIBUTE_UNUSED, 858 asection *sec ATTRIBUTE_UNUSED, 859 int is_local ATTRIBUTE_UNUSED) 860{ 861 unsigned short r_type = howto->type; 862 bfd_byte *hit_data = contents + offset; 863 bfd_vma reloc_bits, check, Rvalue1; 864 bfd * dynobj; 865 866 dynobj = elf_hash_table (info)->dynobj; 867 868 switch (r_type) 869 { 870 case R_CR16_IMM4: 871 case R_CR16_IMM20: 872 case R_CR16_ABS20: 873 break; 874 875 case R_CR16_IMM8: 876 case R_CR16_IMM16: 877 case R_CR16_IMM32: 878 case R_CR16_IMM32a: 879 case R_CR16_REGREL4: 880 case R_CR16_REGREL4a: 881 case R_CR16_REGREL14: 882 case R_CR16_REGREL14a: 883 case R_CR16_REGREL16: 884 case R_CR16_REGREL20: 885 case R_CR16_REGREL20a: 886 case R_CR16_GOT_REGREL20: 887 case R_CR16_GOTC_REGREL20: 888 case R_CR16_ABS24: 889 case R_CR16_DISP16: 890 case R_CR16_DISP24: 891 /* 'hit_data' is relative to the start of the instruction, not the 892 relocation offset. Advance it to account for the exact offset. */ 893 hit_data += 2; 894 break; 895 896 case R_CR16_NONE: 897 return bfd_reloc_ok; 898 break; 899 900 case R_CR16_DISP4: 901 if (is_local) 902 Rvalue += -1; 903 break; 904 905 case R_CR16_DISP8: 906 case R_CR16_DISP24a: 907 if (is_local) 908 Rvalue -= -1; 909 break; 910 911 case R_CR16_SWITCH8: 912 case R_CR16_SWITCH16: 913 case R_CR16_SWITCH32: 914 /* We only care about the addend, where the difference between 915 expressions is kept. */ 916 Rvalue = 0; 917 918 default: 919 break; 920 } 921 922 if (howto->pc_relative) 923 { 924 /* Subtract the address of the section containing the location. */ 925 Rvalue -= (input_section->output_section->vma 926 + input_section->output_offset); 927 /* Subtract the position of the location within the section. */ 928 Rvalue -= offset; 929 } 930 931 /* Add in supplied addend. */ 932 Rvalue += addend; 933 934 /* Complain if the bitfield overflows, whether it is considered 935 as signed or unsigned. */ 936 check = Rvalue >> howto->rightshift; 937 938 /* Assumes two's complement. This expression avoids 939 overflow if howto->bitsize is the number of bits in 940 bfd_vma. */ 941 reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; 942 943 /* For GOT and GOTC relocs no boundary checks applied. */ 944 if (!((r_type == R_CR16_GOT_REGREL20) 945 || (r_type == R_CR16_GOTC_REGREL20))) 946 { 947 if (((bfd_vma) check & ~reloc_bits) != 0 948 && (((bfd_vma) check & ~reloc_bits) 949 != (-(bfd_vma) 1 & ~reloc_bits))) 950 { 951 /* The above right shift is incorrect for a signed 952 value. See if turning on the upper bits fixes the 953 overflow. */ 954 if (howto->rightshift && (bfd_signed_vma) Rvalue < 0) 955 { 956 check |= ((bfd_vma) - 1 957 & ~((bfd_vma) - 1 958 >> howto->rightshift)); 959 960 if (((bfd_vma) check & ~reloc_bits) 961 != (-(bfd_vma) 1 & ~reloc_bits)) 962 return bfd_reloc_overflow; 963 } 964 else 965 return bfd_reloc_overflow; 966 } 967 968 /* Drop unwanted bits from the value we are relocating to. */ 969 Rvalue >>= (bfd_vma) howto->rightshift; 970 971 /* Apply dst_mask to select only relocatable part of the insn. */ 972 Rvalue &= howto->dst_mask; 973 } 974 975 switch (howto->size) 976 { 977 case 0: 978 if (r_type == R_CR16_DISP8) 979 { 980 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 981 Rvalue = ((Rvalue1 & 0xf000) | ((Rvalue << 4) & 0xf00) 982 | (Rvalue1 & 0x00f0) | (Rvalue & 0xf)); 983 bfd_put_16 (input_bfd, Rvalue, hit_data); 984 } 985 else if (r_type == R_CR16_IMM4) 986 { 987 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 988 Rvalue = (((Rvalue1 & 0xff) << 8) | ((Rvalue << 4) & 0xf0) 989 | ((Rvalue1 & 0x0f00) >> 8)); 990 bfd_put_16 (input_bfd, Rvalue, hit_data); 991 } 992 else if (r_type == R_CR16_DISP4) 993 { 994 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 995 Rvalue = (Rvalue1 | ((Rvalue & 0xf) << 4)); 996 bfd_put_16 (input_bfd, Rvalue, hit_data); 997 } 998 else 999 { 1000 bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data); 1001 } 1002 break; 1003 1004 case 1: 1005 if (r_type == R_CR16_DISP16) 1006 { 1007 Rvalue |= (bfd_get_16 (input_bfd, hit_data)); 1008 Rvalue = ((Rvalue & 0xfffe) | ((Rvalue >> 16) & 0x1)); 1009 } 1010 if (r_type == R_CR16_IMM16) 1011 { 1012 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 1013 1014 /* Add or subtract the offset value. */ 1015 if (Rvalue1 & 0x8000) 1016 Rvalue -= (~Rvalue1 + 1) & 0xffff; 1017 else 1018 Rvalue += Rvalue1; 1019 1020 /* Check for range. */ 1021 if ((long) Rvalue > 0xffff || (long) Rvalue < 0x0) 1022 return bfd_reloc_overflow; 1023 } 1024 1025 bfd_put_16 (input_bfd, Rvalue, hit_data); 1026 break; 1027 1028 case 2: 1029 if ((r_type == R_CR16_ABS20) || (r_type == R_CR16_IMM20)) 1030 { 1031 Rvalue1 = (bfd_get_16 (input_bfd, hit_data + 2) 1032 | (((bfd_get_16 (input_bfd, hit_data) & 0xf) <<16))); 1033 1034 /* Add or subtract the offset value. */ 1035 if (Rvalue1 & 0x80000) 1036 Rvalue -= (~Rvalue1 + 1) & 0xfffff; 1037 else 1038 Rvalue += Rvalue1; 1039 1040 /* Check for range. */ 1041 if ((long) Rvalue > 0xfffff || (long) Rvalue < 0x0) 1042 return bfd_reloc_overflow; 1043 1044 bfd_put_16 (input_bfd, ((bfd_get_16 (input_bfd, hit_data) & 0xfff0) 1045 | ((Rvalue >> 16) & 0xf)), hit_data); 1046 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1047 } 1048 else if (r_type == R_CR16_GOT_REGREL20) 1049 { 1050 asection * sgot = bfd_get_section_by_name (dynobj, ".got"); 1051 1052 if (h != NULL) 1053 { 1054 bfd_vma off; 1055 1056 off = h->got.offset; 1057 BFD_ASSERT (off != (bfd_vma) -1); 1058 1059 if (! elf_hash_table (info)->dynamic_sections_created 1060 || SYMBOL_REFERENCES_LOCAL (info, h)) 1061 /* This is actually a static link, or it is a 1062 -Bsymbolic link and the symbol is defined 1063 locally, or the symbol was forced to be local 1064 because of a version file. We must initialize 1065 this entry in the global offset table. 1066 When doing a dynamic link, we create a .rela.got 1067 relocation entry to initialize the value. This 1068 is done in the finish_dynamic_symbol routine. */ 1069 bfd_put_32 (output_bfd, Rvalue, sgot->contents + off); 1070 1071 Rvalue = sgot->output_offset + off; 1072 } 1073 else 1074 { 1075 bfd_vma off; 1076 1077 off = elf_local_got_offsets (input_bfd)[symndx]; 1078 bfd_put_32 (output_bfd,Rvalue, sgot->contents + off); 1079 1080 Rvalue = sgot->output_offset + off; 1081 } 1082 1083 Rvalue += addend; 1084 1085 /* REVISIT: if ((long) Rvalue > 0xffffff || 1086 (long) Rvalue < -0x800000). */ 1087 if ((long) Rvalue > 0xffffff || (long) Rvalue < 0) 1088 return bfd_reloc_overflow; 1089 1090 1091 bfd_put_16 (input_bfd, (bfd_get_16 (input_bfd, hit_data)) 1092 | (((Rvalue >> 16) & 0xf) << 8), hit_data); 1093 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1094 1095 } 1096 else if (r_type == R_CR16_GOTC_REGREL20) 1097 { 1098 asection * sgot; 1099 sgot = bfd_get_section_by_name (dynobj, ".got"); 1100 1101 if (h != NULL) 1102 { 1103 bfd_vma off; 1104 1105 off = h->got.offset; 1106 BFD_ASSERT (off != (bfd_vma) -1); 1107 1108 Rvalue >>=1; /* For code symbols. */ 1109 1110 if (! elf_hash_table (info)->dynamic_sections_created 1111 || SYMBOL_REFERENCES_LOCAL (info, h)) 1112 /* This is actually a static link, or it is a 1113 -Bsymbolic link and the symbol is defined 1114 locally, or the symbol was forced to be local 1115 because of a version file. We must initialize 1116 this entry in the global offset table. 1117 When doing a dynamic link, we create a .rela.got 1118 relocation entry to initialize the value. This 1119 is done in the finish_dynamic_symbol routine. */ 1120 bfd_put_32 (output_bfd, Rvalue, sgot->contents + off); 1121 1122 Rvalue = sgot->output_offset + off; 1123 } 1124 else 1125 { 1126 bfd_vma off; 1127 1128 off = elf_local_got_offsets (input_bfd)[symndx]; 1129 Rvalue >>= 1; 1130 bfd_put_32 (output_bfd,Rvalue, sgot->contents + off); 1131 Rvalue = sgot->output_offset + off; 1132 } 1133 1134 Rvalue += addend; 1135 1136 /* Check if any value in DISP. */ 1137 Rvalue1 =((bfd_get_32 (input_bfd, hit_data) >>16) 1138 | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16)); 1139 1140 /* Add or subtract the offset value. */ 1141 if (Rvalue1 & 0x80000) 1142 Rvalue -= (~Rvalue1 + 1) & 0xfffff; 1143 else 1144 Rvalue += Rvalue1; 1145 1146 /* Check for range. */ 1147 /* REVISIT: if ((long) Rvalue > 0xffffff 1148 || (long) Rvalue < -0x800000). */ 1149 if ((long) Rvalue > 0xffffff || (long) Rvalue < 0) 1150 return bfd_reloc_overflow; 1151 1152 bfd_put_16 (input_bfd, (bfd_get_16 (input_bfd, hit_data)) 1153 | (((Rvalue >> 16) & 0xf) << 8), hit_data); 1154 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1155 } 1156 else 1157 { 1158 if (r_type == R_CR16_ABS24) 1159 { 1160 Rvalue1 = ((bfd_get_32 (input_bfd, hit_data) >> 16) 1161 | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16) 1162 | (((bfd_get_32 (input_bfd, hit_data) & 0xf) <<20))); 1163 1164 /* Add or subtract the offset value. */ 1165 if (Rvalue1 & 0x800000) 1166 Rvalue -= (~Rvalue1 + 1) & 0xffffff; 1167 else 1168 Rvalue += Rvalue1; 1169 1170 /* Check for Range. */ 1171 if ((long) Rvalue > 0xffffff || (long) Rvalue < 0x0) 1172 return bfd_reloc_overflow; 1173 1174 Rvalue = ((((Rvalue >> 20) & 0xf) | (((Rvalue >> 16) & 0xf)<<8) 1175 | (bfd_get_32 (input_bfd, hit_data) & 0xf0f0)) 1176 | ((Rvalue & 0xffff) << 16)); 1177 } 1178 else if (r_type == R_CR16_DISP24) 1179 { 1180 Rvalue = ((((Rvalue >> 20)& 0xf) | (((Rvalue >>16) & 0xf)<<8) 1181 | (bfd_get_16 (input_bfd, hit_data))) 1182 | (((Rvalue & 0xfffe) | ((Rvalue >> 24) & 0x1)) << 16)); 1183 } 1184 else if ((r_type == R_CR16_IMM32) || (r_type == R_CR16_IMM32a)) 1185 { 1186 Rvalue1 =((((bfd_get_32 (input_bfd, hit_data)) >> 16) &0xffff) 1187 | (((bfd_get_32 (input_bfd, hit_data)) &0xffff)) << 16); 1188 1189 /* Add or subtract the offset value. */ 1190 if (Rvalue1 & 0x80000000) 1191 Rvalue -= (~Rvalue1 + 1) & 0xffffffff; 1192 else 1193 Rvalue += Rvalue1; 1194 1195 /* Check for range. */ 1196 if (Rvalue > 0xffffffff || (long) Rvalue < 0x0) 1197 return bfd_reloc_overflow; 1198 1199 Rvalue = (((Rvalue >> 16)& 0xffff) | (Rvalue & 0xffff) << 16); 1200 } 1201 else if (r_type == R_CR16_DISP24a) 1202 { 1203 Rvalue = (((Rvalue & 0xfffffe) | (Rvalue >> 23))); 1204 Rvalue = ((Rvalue >> 16) & 0xff) | ((Rvalue & 0xffff) << 16) 1205 | (bfd_get_32 (input_bfd, hit_data)); 1206 } 1207 else if ((r_type == R_CR16_REGREL20) 1208 || (r_type == R_CR16_REGREL20a)) 1209 { 1210 Rvalue1 = ((bfd_get_32 (input_bfd, hit_data) >> 16) 1211 | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16)); 1212 /* Add or subtract the offset value. */ 1213 if (Rvalue1 & 0x80000) 1214 Rvalue -= (~Rvalue1 + 1) & 0xfffff; 1215 else 1216 Rvalue += Rvalue1; 1217 1218 /* Check for range. */ 1219 if ((long) Rvalue > 0xfffff || (long) Rvalue < 0x0) 1220 return bfd_reloc_overflow; 1221 1222 Rvalue = (((((Rvalue >> 20)& 0xf) | (((Rvalue >>16) & 0xf)<<8) 1223 | ((Rvalue & 0xffff) << 16))) 1224 | (bfd_get_32 (input_bfd, hit_data) & 0xf0ff)); 1225 1226 } 1227 else if (r_type == R_CR16_NUM32) 1228 { 1229 Rvalue1 = (bfd_get_32 (input_bfd, hit_data)); 1230 1231 /* Add or subtract the offset value */ 1232 if (Rvalue1 & 0x80000000) 1233 Rvalue -= (~Rvalue1 + 1) & 0xffffffff; 1234 else 1235 Rvalue += Rvalue1; 1236 1237 /* Check for Ranga */ 1238 if (Rvalue > 0xffffffff) 1239 return bfd_reloc_overflow; 1240 } 1241 1242 bfd_put_32 (input_bfd, Rvalue, hit_data); 1243 } 1244 break; 1245 1246 default: 1247 return bfd_reloc_notsupported; 1248 } 1249 1250 return bfd_reloc_ok; 1251} 1252 1253/* Delete some bytes from a section while relaxing. */ 1254 1255static bfd_boolean 1256elf32_cr16_relax_delete_bytes (struct bfd_link_info *link_info, bfd *abfd, 1257 asection *sec, bfd_vma addr, int count) 1258{ 1259 Elf_Internal_Shdr *symtab_hdr; 1260 unsigned int sec_shndx; 1261 bfd_byte *contents; 1262 Elf_Internal_Rela *irel, *irelend; 1263 bfd_vma toaddr; 1264 Elf_Internal_Sym *isym; 1265 Elf_Internal_Sym *isymend; 1266 struct elf_link_hash_entry **sym_hashes; 1267 struct elf_link_hash_entry **end_hashes; 1268 struct elf_link_hash_entry **start_hashes; 1269 unsigned int symcount; 1270 1271 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); 1272 1273 contents = elf_section_data (sec)->this_hdr.contents; 1274 1275 toaddr = sec->size; 1276 1277 irel = elf_section_data (sec)->relocs; 1278 irelend = irel + sec->reloc_count; 1279 1280 /* Actually delete the bytes. */ 1281 memmove (contents + addr, contents + addr + count, 1282 (size_t) (toaddr - addr - count)); 1283 sec->size -= count; 1284 1285 /* Adjust all the relocs. */ 1286 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) 1287 /* Get the new reloc address. */ 1288 if ((irel->r_offset > addr && irel->r_offset < toaddr)) 1289 irel->r_offset -= count; 1290 1291 /* Adjust the local symbols defined in this section. */ 1292 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1293 isym = (Elf_Internal_Sym *) symtab_hdr->contents; 1294 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) 1295 { 1296 if (isym->st_shndx == sec_shndx 1297 && isym->st_value > addr 1298 && isym->st_value < toaddr) 1299 { 1300 /* Adjust the addend of SWITCH relocations in this section, 1301 which reference this local symbol. */ 1302#if 0 1303 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) 1304 { 1305 unsigned long r_symndx; 1306 Elf_Internal_Sym *rsym; 1307 bfd_vma addsym, subsym; 1308 1309 /* Skip if not a SWITCH relocation. */ 1310 if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH8 1311 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH16 1312 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH32) 1313 continue; 1314 1315 r_symndx = ELF32_R_SYM (irel->r_info); 1316 rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx; 1317 1318 /* Skip if not the local adjusted symbol. */ 1319 if (rsym != isym) 1320 continue; 1321 1322 addsym = isym->st_value; 1323 subsym = addsym - irel->r_addend; 1324 1325 /* Fix the addend only when -->> (addsym > addr >= subsym). */ 1326 if (subsym <= addr) 1327 irel->r_addend -= count; 1328 else 1329 continue; 1330 } 1331#endif 1332 1333 isym->st_value -= count; 1334 } 1335 } 1336 1337 /* Now adjust the global symbols defined in this section. */ 1338 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) 1339 - symtab_hdr->sh_info); 1340 sym_hashes = start_hashes = elf_sym_hashes (abfd); 1341 end_hashes = sym_hashes + symcount; 1342 1343 for (; sym_hashes < end_hashes; sym_hashes++) 1344 { 1345 struct elf_link_hash_entry *sym_hash = *sym_hashes; 1346 1347 /* The '--wrap SYMBOL' option is causing a pain when the object file, 1348 containing the definition of __wrap_SYMBOL, includes a direct 1349 call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference 1350 the same symbol (which is __wrap_SYMBOL), but still exist as two 1351 different symbols in 'sym_hashes', we don't want to adjust 1352 the global symbol __wrap_SYMBOL twice. 1353 This check is only relevant when symbols are being wrapped. */ 1354 if (link_info->wrap_hash != NULL) 1355 { 1356 struct elf_link_hash_entry **cur_sym_hashes; 1357 1358 /* Loop only over the symbols whom been already checked. */ 1359 for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes; 1360 cur_sym_hashes++) 1361 /* If the current symbol is identical to 'sym_hash', that means 1362 the symbol was already adjusted (or at least checked). */ 1363 if (*cur_sym_hashes == sym_hash) 1364 break; 1365 1366 /* Don't adjust the symbol again. */ 1367 if (cur_sym_hashes < sym_hashes) 1368 continue; 1369 } 1370 1371 if ((sym_hash->root.type == bfd_link_hash_defined 1372 || sym_hash->root.type == bfd_link_hash_defweak) 1373 && sym_hash->root.u.def.section == sec 1374 && sym_hash->root.u.def.value > addr 1375 && sym_hash->root.u.def.value < toaddr) 1376 sym_hash->root.u.def.value -= count; 1377 } 1378 1379 return TRUE; 1380} 1381 1382/* Relocate a CR16 ELF section. */ 1383 1384static bfd_boolean 1385elf32_cr16_relocate_section (bfd *output_bfd, struct bfd_link_info *info, 1386 bfd *input_bfd, asection *input_section, 1387 bfd_byte *contents, Elf_Internal_Rela *relocs, 1388 Elf_Internal_Sym *local_syms, 1389 asection **local_sections) 1390{ 1391 Elf_Internal_Shdr *symtab_hdr; 1392 struct elf_link_hash_entry **sym_hashes; 1393 Elf_Internal_Rela *rel, *relend; 1394 1395 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1396 sym_hashes = elf_sym_hashes (input_bfd); 1397 1398 rel = relocs; 1399 relend = relocs + input_section->reloc_count; 1400 for (; rel < relend; rel++) 1401 { 1402 int r_type; 1403 reloc_howto_type *howto; 1404 unsigned long r_symndx; 1405 Elf_Internal_Sym *sym; 1406 asection *sec; 1407 struct elf_link_hash_entry *h; 1408 bfd_vma relocation; 1409 bfd_reloc_status_type r; 1410 1411 r_symndx = ELF32_R_SYM (rel->r_info); 1412 r_type = ELF32_R_TYPE (rel->r_info); 1413 howto = cr16_elf_howto_table + (r_type); 1414 1415 h = NULL; 1416 sym = NULL; 1417 sec = NULL; 1418 if (r_symndx < symtab_hdr->sh_info) 1419 { 1420 sym = local_syms + r_symndx; 1421 sec = local_sections[r_symndx]; 1422 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1423 } 1424 else 1425 { 1426 bfd_boolean unresolved_reloc, warned; 1427 1428 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1429 r_symndx, symtab_hdr, sym_hashes, 1430 h, sec, relocation, 1431 unresolved_reloc, warned); 1432 } 1433 1434 if (sec != NULL && elf_discarded_section (sec)) 1435 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1436 rel, relend, howto, contents); 1437 1438 if (info->relocatable) 1439 continue; 1440 1441 r = cr16_elf_final_link_relocate (howto, input_bfd, output_bfd, 1442 input_section, 1443 contents, rel->r_offset, 1444 relocation, rel->r_addend, 1445 (struct elf_link_hash_entry *) h, 1446 r_symndx, 1447 info, sec, h == NULL); 1448 1449 if (r != bfd_reloc_ok) 1450 { 1451 const char *name; 1452 const char *msg = NULL; 1453 1454 if (h != NULL) 1455 name = h->root.root.string; 1456 else 1457 { 1458 name = (bfd_elf_string_from_elf_section 1459 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 1460 if (name == NULL || *name == '\0') 1461 name = bfd_section_name (input_bfd, sec); 1462 } 1463 1464 switch (r) 1465 { 1466 case bfd_reloc_overflow: 1467 if (!((*info->callbacks->reloc_overflow) 1468 (info, (h ? &h->root : NULL), name, howto->name, 1469 (bfd_vma) 0, input_bfd, input_section, 1470 rel->r_offset))) 1471 return FALSE; 1472 break; 1473 1474 case bfd_reloc_undefined: 1475 if (!((*info->callbacks->undefined_symbol) 1476 (info, name, input_bfd, input_section, 1477 rel->r_offset, TRUE))) 1478 return FALSE; 1479 break; 1480 1481 case bfd_reloc_outofrange: 1482 msg = _("internal error: out of range error"); 1483 goto common_error; 1484 1485 case bfd_reloc_notsupported: 1486 msg = _("internal error: unsupported relocation error"); 1487 goto common_error; 1488 1489 case bfd_reloc_dangerous: 1490 msg = _("internal error: dangerous error"); 1491 goto common_error; 1492 1493 default: 1494 msg = _("internal error: unknown error"); 1495 /* Fall through. */ 1496 1497 common_error: 1498 if (!((*info->callbacks->warning) 1499 (info, msg, name, input_bfd, input_section, 1500 rel->r_offset))) 1501 return FALSE; 1502 break; 1503 } 1504 } 1505 } 1506 1507 return TRUE; 1508} 1509 1510/* This is a version of bfd_generic_get_relocated_section_contents 1511 which uses elf32_cr16_relocate_section. */ 1512 1513static bfd_byte * 1514elf32_cr16_get_relocated_section_contents (bfd *output_bfd, 1515 struct bfd_link_info *link_info, 1516 struct bfd_link_order *link_order, 1517 bfd_byte *data, 1518 bfd_boolean relocatable, 1519 asymbol **symbols) 1520{ 1521 Elf_Internal_Shdr *symtab_hdr; 1522 asection *input_section = link_order->u.indirect.section; 1523 bfd *input_bfd = input_section->owner; 1524 asection **sections = NULL; 1525 Elf_Internal_Rela *internal_relocs = NULL; 1526 Elf_Internal_Sym *isymbuf = NULL; 1527 1528 /* We only need to handle the case of relaxing, or of having a 1529 particular set of section contents, specially. */ 1530 if (relocatable 1531 || elf_section_data (input_section)->this_hdr.contents == NULL) 1532 return bfd_generic_get_relocated_section_contents (output_bfd, link_info, 1533 link_order, data, 1534 relocatable, 1535 symbols); 1536 1537 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1538 1539 memcpy (data, elf_section_data (input_section)->this_hdr.contents, 1540 (size_t) input_section->size); 1541 1542 if ((input_section->flags & SEC_RELOC) != 0 1543 && input_section->reloc_count > 0) 1544 { 1545 Elf_Internal_Sym *isym; 1546 Elf_Internal_Sym *isymend; 1547 asection **secpp; 1548 bfd_size_type amt; 1549 1550 internal_relocs = _bfd_elf_link_read_relocs (input_bfd, input_section, 1551 NULL, NULL, FALSE); 1552 if (internal_relocs == NULL) 1553 goto error_return; 1554 1555 if (symtab_hdr->sh_info != 0) 1556 { 1557 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1558 if (isymbuf == NULL) 1559 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, 1560 symtab_hdr->sh_info, 0, 1561 NULL, NULL, NULL); 1562 if (isymbuf == NULL) 1563 goto error_return; 1564 } 1565 1566 amt = symtab_hdr->sh_info; 1567 amt *= sizeof (asection *); 1568 sections = bfd_malloc (amt); 1569 if (sections == NULL && amt != 0) 1570 goto error_return; 1571 1572 isymend = isymbuf + symtab_hdr->sh_info; 1573 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) 1574 { 1575 asection *isec; 1576 1577 if (isym->st_shndx == SHN_UNDEF) 1578 isec = bfd_und_section_ptr; 1579 else if (isym->st_shndx == SHN_ABS) 1580 isec = bfd_abs_section_ptr; 1581 else if (isym->st_shndx == SHN_COMMON) 1582 isec = bfd_com_section_ptr; 1583 else 1584 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); 1585 1586 *secpp = isec; 1587 } 1588 1589 if (! elf32_cr16_relocate_section (output_bfd, link_info, input_bfd, 1590 input_section, data, internal_relocs, 1591 isymbuf, sections)) 1592 goto error_return; 1593 1594 if (sections != NULL) 1595 free (sections); 1596 if (isymbuf != NULL 1597 && symtab_hdr->contents != (unsigned char *) isymbuf) 1598 free (isymbuf); 1599 if (elf_section_data (input_section)->relocs != internal_relocs) 1600 free (internal_relocs); 1601 } 1602 1603 return data; 1604 1605 error_return: 1606 if (sections != NULL) 1607 free (sections); 1608 if (isymbuf != NULL 1609 && symtab_hdr->contents != (unsigned char *) isymbuf) 1610 free (isymbuf); 1611 if (internal_relocs != NULL 1612 && elf_section_data (input_section)->relocs != internal_relocs) 1613 free (internal_relocs); 1614 return NULL; 1615} 1616 1617/* Assorted hash table functions. */ 1618 1619/* Initialize an entry in the link hash table. */ 1620 1621/* Create an entry in an CR16 ELF linker hash table. */ 1622 1623static struct bfd_hash_entry * 1624elf32_cr16_link_hash_newfunc (struct bfd_hash_entry *entry, 1625 struct bfd_hash_table *table, 1626 const char *string) 1627{ 1628 struct elf32_cr16_link_hash_entry *ret = 1629 (struct elf32_cr16_link_hash_entry *) entry; 1630 1631 /* Allocate the structure if it has not already been allocated by a 1632 subclass. */ 1633 if (ret == (struct elf32_cr16_link_hash_entry *) NULL) 1634 ret = ((struct elf32_cr16_link_hash_entry *) 1635 bfd_hash_allocate (table, 1636 sizeof (struct elf32_cr16_link_hash_entry))); 1637 if (ret == (struct elf32_cr16_link_hash_entry *) NULL) 1638 return (struct bfd_hash_entry *) ret; 1639 1640 /* Call the allocation method of the superclass. */ 1641 ret = ((struct elf32_cr16_link_hash_entry *) 1642 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 1643 table, string)); 1644 if (ret != (struct elf32_cr16_link_hash_entry *) NULL) 1645 { 1646 ret->direct_calls = 0; 1647 ret->stack_size = 0; 1648 ret->movm_args = 0; 1649 ret->movm_stack_size = 0; 1650 ret->flags = 0; 1651 ret->value = 0; 1652 } 1653 1654 return (struct bfd_hash_entry *) ret; 1655} 1656 1657/* Create an cr16 ELF linker hash table. */ 1658 1659static struct bfd_link_hash_table * 1660elf32_cr16_link_hash_table_create (bfd *abfd) 1661{ 1662 struct elf_link_hash_table *ret; 1663 bfd_size_type amt = sizeof (struct elf_link_hash_table); 1664 1665 ret = (struct elf_link_hash_table *) bfd_malloc (amt); 1666 if (ret == (struct elf_link_hash_table *) NULL) 1667 return NULL; 1668 1669 if (!_bfd_elf_link_hash_table_init (ret, abfd, 1670 elf32_cr16_link_hash_newfunc, 1671 sizeof (struct elf32_cr16_link_hash_entry), 1672 GENERIC_ELF_DATA)) 1673 { 1674 free (ret); 1675 return NULL; 1676 } 1677 1678 return &ret->root; 1679} 1680 1681/* Free an cr16 ELF linker hash table. */ 1682 1683static void 1684elf32_cr16_link_hash_table_free (struct bfd_link_hash_table *hash) 1685{ 1686 struct elf_link_hash_table *ret 1687 = (struct elf_link_hash_table *) hash; 1688 1689 _bfd_generic_link_hash_table_free 1690 ((struct bfd_link_hash_table *) ret); 1691} 1692 1693static unsigned long 1694elf_cr16_mach (flagword flags) 1695{ 1696 switch (flags) 1697 { 1698 case EM_CR16: 1699 default: 1700 return bfd_mach_cr16; 1701 } 1702} 1703 1704/* The final processing done just before writing out a CR16 ELF object 1705 file. This gets the CR16 architecture right based on the machine 1706 number. */ 1707 1708static void 1709_bfd_cr16_elf_final_write_processing (bfd *abfd, 1710 bfd_boolean linker ATTRIBUTE_UNUSED) 1711{ 1712 unsigned long val; 1713 switch (bfd_get_mach (abfd)) 1714 { 1715 default: 1716 case bfd_mach_cr16: 1717 val = EM_CR16; 1718 break; 1719 } 1720 1721 1722 elf_elfheader (abfd)->e_flags |= val; 1723} 1724 1725 1726static bfd_boolean 1727_bfd_cr16_elf_object_p (bfd *abfd) 1728{ 1729 bfd_default_set_arch_mach (abfd, bfd_arch_cr16, 1730 elf_cr16_mach (elf_elfheader (abfd)->e_flags)); 1731 return TRUE; 1732} 1733 1734/* Merge backend specific data from an object file to the output 1735 object file when linking. */ 1736 1737static bfd_boolean 1738_bfd_cr16_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 1739{ 1740 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1741 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1742 return TRUE; 1743 1744 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) 1745 && bfd_get_mach (obfd) < bfd_get_mach (ibfd)) 1746 { 1747 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), 1748 bfd_get_mach (ibfd))) 1749 return FALSE; 1750 } 1751 1752 return TRUE; 1753} 1754 1755 1756/* This function handles relaxing for the CR16. 1757 1758 There's quite a few relaxing opportunites available on the CR16: 1759 1760 * bcond:24 -> bcond:16 1 byte 1761 * bcond:16 -> bcond:8 1 byte 1762 * arithmetic imm32 -> arithmetic imm20 12 bits 1763 * arithmetic imm20/imm16 -> arithmetic imm4 12/16 bits 1764 1765 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 1766 1767static bfd_boolean 1768elf32_cr16_relax_section (bfd *abfd, asection *sec, 1769 struct bfd_link_info *link_info, bfd_boolean *again) 1770{ 1771 Elf_Internal_Shdr *symtab_hdr; 1772 Elf_Internal_Rela *internal_relocs; 1773 Elf_Internal_Rela *irel, *irelend; 1774 bfd_byte *contents = NULL; 1775 Elf_Internal_Sym *isymbuf = NULL; 1776 1777 /* Assume nothing changes. */ 1778 *again = FALSE; 1779 1780 /* We don't have to do anything for a relocatable link, if 1781 this section does not have relocs, or if this is not a 1782 code section. */ 1783 if (link_info->relocatable 1784 || (sec->flags & SEC_RELOC) == 0 1785 || sec->reloc_count == 0 1786 || (sec->flags & SEC_CODE) == 0) 1787 return TRUE; 1788 1789 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1790 1791 /* Get a copy of the native relocations. */ 1792 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, 1793 link_info->keep_memory); 1794 if (internal_relocs == NULL) 1795 goto error_return; 1796 1797 /* Walk through them looking for relaxing opportunities. */ 1798 irelend = internal_relocs + sec->reloc_count; 1799 for (irel = internal_relocs; irel < irelend; irel++) 1800 { 1801 bfd_vma symval; 1802 1803 /* If this isn't something that can be relaxed, then ignore 1804 this reloc. */ 1805 if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP16 1806 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP24 1807 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM32 1808 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM20 1809 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM16) 1810 continue; 1811 1812 /* Get the section contents if we haven't done so already. */ 1813 if (contents == NULL) 1814 { 1815 /* Get cached copy if it exists. */ 1816 if (elf_section_data (sec)->this_hdr.contents != NULL) 1817 contents = elf_section_data (sec)->this_hdr.contents; 1818 /* Go get them off disk. */ 1819 else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1820 goto error_return; 1821 } 1822 1823 /* Read this BFD's local symbols if we haven't done so already. */ 1824 if (isymbuf == NULL && symtab_hdr->sh_info != 0) 1825 { 1826 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1827 if (isymbuf == NULL) 1828 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 1829 symtab_hdr->sh_info, 0, 1830 NULL, NULL, NULL); 1831 if (isymbuf == NULL) 1832 goto error_return; 1833 } 1834 1835 /* Get the value of the symbol referred to by the reloc. */ 1836 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 1837 { 1838 /* A local symbol. */ 1839 Elf_Internal_Sym *isym; 1840 asection *sym_sec; 1841 1842 isym = isymbuf + ELF32_R_SYM (irel->r_info); 1843 if (isym->st_shndx == SHN_UNDEF) 1844 sym_sec = bfd_und_section_ptr; 1845 else if (isym->st_shndx == SHN_ABS) 1846 sym_sec = bfd_abs_section_ptr; 1847 else if (isym->st_shndx == SHN_COMMON) 1848 sym_sec = bfd_com_section_ptr; 1849 else 1850 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 1851 symval = (isym->st_value 1852 + sym_sec->output_section->vma 1853 + sym_sec->output_offset); 1854 } 1855 else 1856 { 1857 unsigned long indx; 1858 struct elf_link_hash_entry *h; 1859 1860 /* An external symbol. */ 1861 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 1862 h = elf_sym_hashes (abfd)[indx]; 1863 BFD_ASSERT (h != NULL); 1864 1865 if (h->root.type != bfd_link_hash_defined 1866 && h->root.type != bfd_link_hash_defweak) 1867 /* This appears to be a reference to an undefined 1868 symbol. Just ignore it--it will be caught by the 1869 regular reloc processing. */ 1870 continue; 1871 1872 symval = (h->root.u.def.value 1873 + h->root.u.def.section->output_section->vma 1874 + h->root.u.def.section->output_offset); 1875 } 1876 1877 /* For simplicity of coding, we are going to modify the section 1878 contents, the section relocs, and the BFD symbol table. We 1879 must tell the rest of the code not to free up this 1880 information. It would be possible to instead create a table 1881 of changes which have to be made, as is done in coff-mips.c; 1882 that would be more work, but would require less memory when 1883 the linker is run. */ 1884 1885 /* Try to turn a 24 branch/call into a 16bit relative 1886 branch/call. */ 1887 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP24) 1888 { 1889 bfd_vma value = symval; 1890 1891 /* Deal with pc-relative gunk. */ 1892 value -= (sec->output_section->vma + sec->output_offset); 1893 value -= irel->r_offset; 1894 value += irel->r_addend; 1895 1896 /* See if the value will fit in 16 bits, note the high value is 1897 0xfffe + 2 as the target will be two bytes closer if we are 1898 able to relax. */ 1899 if ((long) value < 0x10000 && (long) value > -0x10002) 1900 { 1901 unsigned int code; 1902 1903 /* Get the opcode. */ 1904 code = (unsigned int) bfd_get_32 (abfd, contents + irel->r_offset); 1905 1906 /* Verify it's a 'bcond' and fix the opcode. */ 1907 if ((code & 0xffff) == 0x0010) 1908 bfd_put_16 (abfd, 0x1800 | ((0xf & (code >> 20)) << 4), contents + irel->r_offset); 1909 else 1910 continue; 1911 1912 /* Note that we've changed the relocs, section contents, etc. */ 1913 elf_section_data (sec)->relocs = internal_relocs; 1914 elf_section_data (sec)->this_hdr.contents = contents; 1915 symtab_hdr->contents = (unsigned char *) isymbuf; 1916 1917 /* Fix the relocation's type. */ 1918 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1919 R_CR16_DISP16); 1920 1921 /* Delete two bytes of data. */ 1922 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1923 irel->r_offset + 2, 2)) 1924 goto error_return; 1925 1926 /* That will change things, so, we should relax again. 1927 Note that this is not required, and it may be slow. */ 1928 *again = TRUE; 1929 } 1930 } 1931 1932 /* Try to turn a 16bit pc-relative branch into an 1933 8bit pc-relative branch. */ 1934 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP16) 1935 { 1936 bfd_vma value = symval; 1937 1938 /* Deal with pc-relative gunk. */ 1939 value -= (sec->output_section->vma + sec->output_offset); 1940 value -= irel->r_offset; 1941 value += irel->r_addend; 1942 1943 /* See if the value will fit in 8 bits, note the high value is 1944 0xfc + 2 as the target will be two bytes closer if we are 1945 able to relax. */ 1946 /*if ((long) value < 0x1fa && (long) value > -0x100) REVISIT:range */ 1947 if ((long) value < 0xfa && (long) value > -0x100) 1948 { 1949 unsigned short code; 1950 1951 /* Get the opcode. */ 1952 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 1953 1954 /* Verify it's a 'bcond' and fix the opcode. */ 1955 if ((code & 0xff0f) == 0x1800) 1956 bfd_put_16 (abfd, (code & 0xf0f0), contents + irel->r_offset); 1957 else 1958 continue; 1959 1960 /* Note that we've changed the relocs, section contents, etc. */ 1961 elf_section_data (sec)->relocs = internal_relocs; 1962 elf_section_data (sec)->this_hdr.contents = contents; 1963 symtab_hdr->contents = (unsigned char *) isymbuf; 1964 1965 /* Fix the relocation's type. */ 1966 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1967 R_CR16_DISP8); 1968 1969 /* Delete two bytes of data. */ 1970 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1971 irel->r_offset + 2, 2)) 1972 goto error_return; 1973 1974 /* That will change things, so, we should relax again. 1975 Note that this is not required, and it may be slow. */ 1976 *again = TRUE; 1977 } 1978 } 1979 1980 /* Try to turn a 32-bit IMM address into a 20/16-bit IMM address */ 1981 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM32) 1982 { 1983 bfd_vma value = symval; 1984 unsigned short is_add_mov = 0; 1985 bfd_vma value1 = 0; 1986 1987 /* Get the existing value from the mcode */ 1988 value1 = ((bfd_get_32 (abfd, contents + irel->r_offset + 2) >> 16) 1989 |(((bfd_get_32 (abfd, contents + irel->r_offset + 2) & 0xffff) << 16))); 1990 1991 /* See if the value will fit in 20 bits. */ 1992 if ((long) (value + value1) < 0xfffff && (long) (value + value1) > 0) 1993 { 1994 unsigned short code; 1995 1996 /* Get the opcode. */ 1997 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 1998 1999 /* Verify it's a 'arithmetic ADDD or MOVD instruction'. 2000 For ADDD and MOVD only, convert to IMM32 -> IMM20. */ 2001 2002 if (((code & 0xfff0) == 0x0070) || ((code & 0xfff0) == 0x0020)) 2003 is_add_mov = 1; 2004 2005 if (is_add_mov) 2006 { 2007 /* Note that we've changed the relocs, section contents, 2008 etc. */ 2009 elf_section_data (sec)->relocs = internal_relocs; 2010 elf_section_data (sec)->this_hdr.contents = contents; 2011 symtab_hdr->contents = (unsigned char *) isymbuf; 2012 2013 /* Fix the opcode. */ 2014 if ((code & 0xfff0) == 0x0070) /* For movd. */ 2015 bfd_put_8 (abfd, 0x05, contents + irel->r_offset + 1); 2016 else /* code == 0x0020 for addd. */ 2017 bfd_put_8 (abfd, 0x04, contents + irel->r_offset + 1); 2018 2019 bfd_put_8 (abfd, (code & 0xf) << 4, contents + irel->r_offset); 2020 2021 /* If existing value is nagavive adjust approriately 2022 place the 16-20bits (ie 4 bit) in new opcode, 2023 as the 0xffffxxxx, the higher 2 byte values removed. */ 2024 if (value1 & 0x80000000) 2025 bfd_put_8 (abfd, (0x0f | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2026 else 2027 bfd_put_8 (abfd, (((value1 >> 16)&0xf) | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2028 2029 /* Fix the relocation's type. */ 2030 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2031 R_CR16_IMM20); 2032 2033 /* Delete two bytes of data. */ 2034 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2035 irel->r_offset + 2, 2)) 2036 goto error_return; 2037 2038 /* That will change things, so, we should relax again. 2039 Note that this is not required, and it may be slow. */ 2040 *again = TRUE; 2041 } 2042 } 2043 2044 /* See if the value will fit in 16 bits. */ 2045 if ((!is_add_mov) 2046 && ((long)(value + value1) < 0x7fff && (long)(value + value1) > 0)) 2047 { 2048 unsigned short code; 2049 2050 /* Get the opcode. */ 2051 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 2052 2053 /* Note that we've changed the relocs, section contents, etc. */ 2054 elf_section_data (sec)->relocs = internal_relocs; 2055 elf_section_data (sec)->this_hdr.contents = contents; 2056 symtab_hdr->contents = (unsigned char *) isymbuf; 2057 2058 /* Fix the opcode. */ 2059 if ((code & 0xf0) == 0x70) /* For movd. */ 2060 bfd_put_8 (abfd, 0x54, contents + irel->r_offset + 1); 2061 else if ((code & 0xf0) == 0x20) /* For addd. */ 2062 bfd_put_8 (abfd, 0x60, contents + irel->r_offset + 1); 2063 else if ((code & 0xf0) == 0x90) /* For cmpd. */ 2064 bfd_put_8 (abfd, 0x56, contents + irel->r_offset + 1); 2065 else 2066 continue; 2067 2068 bfd_put_8 (abfd, 0xb0 | (code & 0xf), contents + irel->r_offset); 2069 2070 /* If existing value is nagavive adjust approriately 2071 place the 12-16bits (ie 4 bit) in new opcode, 2072 as the 0xfffffxxx, the higher 2 byte values removed. */ 2073 if (value1 & 0x80000000) 2074 bfd_put_8 (abfd, (0x0f | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2075 else 2076 bfd_put_16 (abfd, value1, contents + irel->r_offset + 2); 2077 2078 2079 /* Fix the relocation's type. */ 2080 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2081 R_CR16_IMM16); 2082 2083 /* Delete two bytes of data. */ 2084 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2085 irel->r_offset + 2, 2)) 2086 goto error_return; 2087 2088 /* That will change things, so, we should relax again. 2089 Note that this is not required, and it may be slow. */ 2090 *again = TRUE; 2091 } 2092 } 2093 2094#if 0 2095 /* Try to turn a 16bit immediate address into a 4bit 2096 immediate address. */ 2097 if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20) 2098 || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM16)) 2099 { 2100 bfd_vma value = symval; 2101 bfd_vma value1 = 0; 2102 2103 /* Get the existing value from the mcode */ 2104 value1 = ((bfd_get_16 (abfd, contents + irel->r_offset + 2) & 0xffff)); 2105 2106 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20) 2107 { 2108 value1 |= ((bfd_get_16 (abfd, contents + irel->r_offset + 1) & 0xf000) << 0x4); 2109 } 2110 2111 /* See if the value will fit in 4 bits. */ 2112 if ((((long) (value + value1)) < 0xf) 2113 && (((long) (value + value1)) > 0)) 2114 { 2115 unsigned short code; 2116 2117 /* Get the opcode. */ 2118 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 2119 2120 /* Note that we've changed the relocs, section contents, etc. */ 2121 elf_section_data (sec)->relocs = internal_relocs; 2122 elf_section_data (sec)->this_hdr.contents = contents; 2123 symtab_hdr->contents = (unsigned char *) isymbuf; 2124 2125 /* Fix the opcode. */ 2126 if (((code & 0x0f00) == 0x0400) || ((code & 0x0f00) == 0x0500)) 2127 { 2128 if ((code & 0x0f00) == 0x0400) /* For movd imm20. */ 2129 bfd_put_8 (abfd, 0x60, contents + irel->r_offset); 2130 else /* For addd imm20. */ 2131 bfd_put_8 (abfd, 0x54, contents + irel->r_offset); 2132 bfd_put_8 (abfd, (code & 0xf0) >> 4, contents + irel->r_offset + 1); 2133 } 2134 else 2135 { 2136 if ((code & 0xfff0) == 0x56b0) /* For cmpd imm16. */ 2137 bfd_put_8 (abfd, 0x56, contents + irel->r_offset); 2138 else if ((code & 0xfff0) == 0x54b0) /* For movd imm16. */ 2139 bfd_put_8 (abfd, 0x54, contents + irel->r_offset); 2140 else if ((code & 0xfff0) == 0x58b0) /* For movb imm16. */ 2141 bfd_put_8 (abfd, 0x58, contents + irel->r_offset); 2142 else if ((code & 0xfff0) == 0x5Ab0) /* For movw imm16. */ 2143 bfd_put_8 (abfd, 0x5A, contents + irel->r_offset); 2144 else if ((code & 0xfff0) == 0x60b0) /* For addd imm16. */ 2145 bfd_put_8 (abfd, 0x60, contents + irel->r_offset); 2146 else if ((code & 0xfff0) == 0x30b0) /* For addb imm16. */ 2147 bfd_put_8 (abfd, 0x30, contents + irel->r_offset); 2148 else if ((code & 0xfff0) == 0x2Cb0) /* For addub imm16. */ 2149 bfd_put_8 (abfd, 0x2C, contents + irel->r_offset); 2150 else if ((code & 0xfff0) == 0x32b0) /* For adduw imm16. */ 2151 bfd_put_8 (abfd, 0x32, contents + irel->r_offset); 2152 else if ((code & 0xfff0) == 0x38b0) /* For subb imm16. */ 2153 bfd_put_8 (abfd, 0x38, contents + irel->r_offset); 2154 else if ((code & 0xfff0) == 0x3Cb0) /* For subcb imm16. */ 2155 bfd_put_8 (abfd, 0x3C, contents + irel->r_offset); 2156 else if ((code & 0xfff0) == 0x3Fb0) /* For subcw imm16. */ 2157 bfd_put_8 (abfd, 0x3F, contents + irel->r_offset); 2158 else if ((code & 0xfff0) == 0x3Ab0) /* For subw imm16. */ 2159 bfd_put_8 (abfd, 0x3A, contents + irel->r_offset); 2160 else if ((code & 0xfff0) == 0x50b0) /* For cmpb imm16. */ 2161 bfd_put_8 (abfd, 0x50, contents + irel->r_offset); 2162 else if ((code & 0xfff0) == 0x52b0) /* For cmpw imm16. */ 2163 bfd_put_8 (abfd, 0x52, contents + irel->r_offset); 2164 else 2165 continue; 2166 2167 bfd_put_8 (abfd, (code & 0xf), contents + irel->r_offset + 1); 2168 } 2169 2170 /* Fix the relocation's type. */ 2171 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2172 R_CR16_IMM4); 2173 2174 /* Delete two bytes of data. */ 2175 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2176 irel->r_offset + 2, 2)) 2177 goto error_return; 2178 2179 /* That will change things, so, we should relax again. 2180 Note that this is not required, and it may be slow. */ 2181 *again = TRUE; 2182 } 2183 } 2184#endif 2185 } 2186 2187 if (isymbuf != NULL 2188 && symtab_hdr->contents != (unsigned char *) isymbuf) 2189 { 2190 if (! link_info->keep_memory) 2191 free (isymbuf); 2192 else 2193 /* Cache the symbols for elf_link_input_bfd. */ 2194 symtab_hdr->contents = (unsigned char *) isymbuf; 2195 } 2196 2197 if (contents != NULL 2198 && elf_section_data (sec)->this_hdr.contents != contents) 2199 { 2200 if (! link_info->keep_memory) 2201 free (contents); 2202 else 2203 /* Cache the section contents for elf_link_input_bfd. */ 2204 elf_section_data (sec)->this_hdr.contents = contents; 2205 2206 } 2207 2208 if (internal_relocs != NULL 2209 && elf_section_data (sec)->relocs != internal_relocs) 2210 free (internal_relocs); 2211 2212 return TRUE; 2213 2214 error_return: 2215 if (isymbuf != NULL 2216 && symtab_hdr->contents != (unsigned char *) isymbuf) 2217 free (isymbuf); 2218 if (contents != NULL 2219 && elf_section_data (sec)->this_hdr.contents != contents) 2220 free (contents); 2221 if (internal_relocs != NULL 2222 && elf_section_data (sec)->relocs != internal_relocs) 2223 free (internal_relocs); 2224 2225 return FALSE; 2226} 2227 2228static asection * 2229elf32_cr16_gc_mark_hook (asection *sec, 2230 struct bfd_link_info *info, 2231 Elf_Internal_Rela *rel, 2232 struct elf_link_hash_entry *h, 2233 Elf_Internal_Sym *sym) 2234{ 2235 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2236} 2237 2238/* Update the got entry reference counts for the section being removed. */ 2239 2240static bfd_boolean 2241elf32_cr16_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, 2242 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2243 asection *sec ATTRIBUTE_UNUSED, 2244 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 2245{ 2246 /* We don't support garbage collection of GOT and PLT relocs yet. */ 2247 return TRUE; 2248} 2249 2250/* Create dynamic sections when linking against a dynamic object. */ 2251 2252static bfd_boolean 2253_bfd_cr16_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 2254{ 2255 flagword flags; 2256 asection * s; 2257 const struct elf_backend_data * bed = get_elf_backend_data (abfd); 2258 int ptralign = 0; 2259 2260 switch (bed->s->arch_size) 2261 { 2262 case 16: 2263 ptralign = 1; 2264 break; 2265 2266 case 32: 2267 ptralign = 2; 2268 break; 2269 2270 default: 2271 bfd_set_error (bfd_error_bad_value); 2272 return FALSE; 2273 } 2274 2275 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and 2276 .rel[a].bss sections. */ 2277 2278 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 2279 | SEC_LINKER_CREATED); 2280 2281 s = bfd_make_section_with_flags (abfd, 2282 (bed->default_use_rela_p 2283 ? ".rela.plt" : ".rel.plt"), 2284 flags | SEC_READONLY); 2285 if (s == NULL 2286 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2287 return FALSE; 2288 2289 if (! _bfd_cr16_elf_create_got_section (abfd, info)) 2290 return FALSE; 2291 2292 { 2293 const char * secname; 2294 char * relname; 2295 flagword secflags; 2296 asection * sec; 2297 2298 for (sec = abfd->sections; sec; sec = sec->next) 2299 { 2300 secflags = bfd_get_section_flags (abfd, sec); 2301 if ((secflags & (SEC_DATA | SEC_LINKER_CREATED)) 2302 || ((secflags & SEC_HAS_CONTENTS) != SEC_HAS_CONTENTS)) 2303 continue; 2304 2305 secname = bfd_get_section_name (abfd, sec); 2306 relname = (char *) bfd_malloc (strlen (secname) + 6); 2307 strcpy (relname, ".rela"); 2308 strcat (relname, secname); 2309 2310 s = bfd_make_section_with_flags (abfd, relname, 2311 flags | SEC_READONLY); 2312 if (s == NULL 2313 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2314 return FALSE; 2315 } 2316 } 2317 2318 if (bed->want_dynbss) 2319 { 2320 /* The .dynbss section is a place to put symbols which are defined 2321 by dynamic objects, are referenced by regular objects, and are 2322 not functions. We must allocate space for them in the process 2323 image and use a R_*_COPY reloc to tell the dynamic linker to 2324 initialize them at run time. The linker script puts the .dynbss 2325 section into the .bss section of the final image. */ 2326 s = bfd_make_section_with_flags (abfd, ".dynbss", 2327 SEC_ALLOC | SEC_LINKER_CREATED); 2328 if (s == NULL) 2329 return FALSE; 2330 2331 /* The .rel[a].bss section holds copy relocs. This section is not 2332 normally needed. We need to create it here, though, so that the 2333 linker will map it to an output section. We can't just create it 2334 only if we need it, because we will not know whether we need it 2335 until we have seen all the input files, and the first time the 2336 main linker code calls BFD after examining all the input files 2337 (size_dynamic_sections) the input sections have already been 2338 mapped to the output sections. If the section turns out not to 2339 be needed, we can discard it later. We will never need this 2340 section when generating a shared object, since they do not use 2341 copy relocs. */ 2342 if (! info->executable) 2343 { 2344 s = bfd_make_section_with_flags (abfd, 2345 (bed->default_use_rela_p 2346 ? ".rela.bss" : ".rel.bss"), 2347 flags | SEC_READONLY); 2348 if (s == NULL 2349 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2350 return FALSE; 2351 } 2352 } 2353 2354 return TRUE; 2355} 2356 2357/* Adjust a symbol defined by a dynamic object and referenced by a 2358 regular object. The current definition is in some section of the 2359 dynamic object, but we're not including those sections. We have to 2360 change the definition to something the rest of the link can 2361 understand. */ 2362 2363static bfd_boolean 2364_bfd_cr16_elf_adjust_dynamic_symbol (struct bfd_link_info * info, 2365 struct elf_link_hash_entry * h) 2366{ 2367 bfd * dynobj; 2368 asection * s; 2369 2370 dynobj = elf_hash_table (info)->dynobj; 2371 2372 /* Make sure we know what is going on here. */ 2373 BFD_ASSERT (dynobj != NULL 2374 && (h->needs_plt 2375 || h->u.weakdef != NULL 2376 || (h->def_dynamic 2377 && h->ref_regular 2378 && !h->def_regular))); 2379 2380 /* If this is a function, put it in the procedure linkage table. We 2381 will fill in the contents of the procedure linkage table later, 2382 when we know the address of the .got section. */ 2383 if (h->type == STT_FUNC 2384 || h->needs_plt) 2385 { 2386 if (! info->executable 2387 && !h->def_dynamic 2388 && !h->ref_dynamic) 2389 { 2390 /* This case can occur if we saw a PLT reloc in an input 2391 file, but the symbol was never referred to by a dynamic 2392 object. In such a case, we don't actually need to build 2393 a procedure linkage table, and we can just do a REL32 2394 reloc instead. */ 2395 BFD_ASSERT (h->needs_plt); 2396 return TRUE; 2397 } 2398 2399 /* Make sure this symbol is output as a dynamic symbol. */ 2400 if (h->dynindx == -1) 2401 { 2402 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2403 return FALSE; 2404 } 2405 2406 /* We also need to make an entry in the .got.plt section, which 2407 will be placed in the .got section by the linker script. */ 2408 2409 s = bfd_get_section_by_name (dynobj, ".got.plt"); 2410 BFD_ASSERT (s != NULL); 2411 s->size += 4; 2412 2413 /* We also need to make an entry in the .rela.plt section. */ 2414 2415 s = bfd_get_section_by_name (dynobj, ".rela.plt"); 2416 BFD_ASSERT (s != NULL); 2417 s->size += sizeof (Elf32_External_Rela); 2418 2419 return TRUE; 2420 } 2421 2422 /* If this is a weak symbol, and there is a real definition, the 2423 processor independent code will have arranged for us to see the 2424 real definition first, and we can just use the same value. */ 2425 if (h->u.weakdef != NULL) 2426 { 2427 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 2428 || h->u.weakdef->root.type == bfd_link_hash_defweak); 2429 h->root.u.def.section = h->u.weakdef->root.u.def.section; 2430 h->root.u.def.value = h->u.weakdef->root.u.def.value; 2431 return TRUE; 2432 } 2433 2434 /* This is a reference to a symbol defined by a dynamic object which 2435 is not a function. */ 2436 2437 /* If we are creating a shared library, we must presume that the 2438 only references to the symbol are via the global offset table. 2439 For such cases we need not do anything here; the relocations will 2440 be handled correctly by relocate_section. */ 2441 if (info->executable) 2442 return TRUE; 2443 2444 /* If there are no references to this symbol that do not use the 2445 GOT, we don't need to generate a copy reloc. */ 2446 if (!h->non_got_ref) 2447 return TRUE; 2448 2449 if (h->size == 0) 2450 { 2451 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 2452 h->root.root.string); 2453 return TRUE; 2454 } 2455 2456 /* We must allocate the symbol in our .dynbss section, which will 2457 become part of the .bss section of the executable. There will be 2458 an entry for this symbol in the .dynsym section. The dynamic 2459 object will contain position independent code, so all references 2460 from the dynamic object to this symbol will go through the global 2461 offset table. The dynamic linker will use the .dynsym entry to 2462 determine the address it must put in the global offset table, so 2463 both the dynamic object and the regular object will refer to the 2464 same memory location for the variable. */ 2465 2466 s = bfd_get_section_by_name (dynobj, ".dynbss"); 2467 BFD_ASSERT (s != NULL); 2468 2469 /* We must generate a R_CR16_COPY reloc to tell the dynamic linker to 2470 copy the initial value out of the dynamic object and into the 2471 runtime process image. We need to remember the offset into the 2472 .rela.bss section we are going to use. */ 2473 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 2474 { 2475 asection * srel; 2476 2477 srel = bfd_get_section_by_name (dynobj, ".rela.bss"); 2478 BFD_ASSERT (srel != NULL); 2479 srel->size += sizeof (Elf32_External_Rela); 2480 h->needs_copy = 1; 2481 } 2482 2483 return _bfd_elf_adjust_dynamic_copy (h, s); 2484} 2485 2486/* Set the sizes of the dynamic sections. */ 2487 2488static bfd_boolean 2489_bfd_cr16_elf_size_dynamic_sections (bfd * output_bfd, 2490 struct bfd_link_info * info) 2491{ 2492 bfd * dynobj; 2493 asection * s; 2494 bfd_boolean plt; 2495 bfd_boolean relocs; 2496 bfd_boolean reltext; 2497 2498 dynobj = elf_hash_table (info)->dynobj; 2499 BFD_ASSERT (dynobj != NULL); 2500 2501 if (elf_hash_table (info)->dynamic_sections_created) 2502 { 2503 /* Set the contents of the .interp section to the interpreter. */ 2504 if (info->executable) 2505 { 2506#if 0 2507 s = bfd_get_section_by_name (dynobj, ".interp"); 2508 BFD_ASSERT (s != NULL); 2509 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2510 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2511#endif 2512 } 2513 } 2514 else 2515 { 2516 /* We may have created entries in the .rela.got section. 2517 However, if we are not creating the dynamic sections, we will 2518 not actually use these entries. Reset the size of .rela.got, 2519 which will cause it to get stripped from the output file 2520 below. */ 2521 s = bfd_get_section_by_name (dynobj, ".rela.got"); 2522 if (s != NULL) 2523 s->size = 0; 2524 } 2525 2526 /* The check_relocs and adjust_dynamic_symbol entry points have 2527 determined the sizes of the various dynamic sections. Allocate 2528 memory for them. */ 2529 plt = FALSE; 2530 relocs = FALSE; 2531 reltext = FALSE; 2532 for (s = dynobj->sections; s != NULL; s = s->next) 2533 { 2534 const char * name; 2535 2536 if ((s->flags & SEC_LINKER_CREATED) == 0) 2537 continue; 2538 2539 /* It's OK to base decisions on the section name, because none 2540 of the dynobj section names depend upon the input files. */ 2541 name = bfd_get_section_name (dynobj, s); 2542 2543 if (strcmp (name, ".plt") == 0) 2544 { 2545 /* Remember whether there is a PLT. */ 2546 plt = s->size != 0; 2547 } 2548 else if (CONST_STRNEQ (name, ".rela")) 2549 { 2550 if (s->size != 0) 2551 { 2552 asection * target; 2553 2554 /* Remember whether there are any reloc sections other 2555 than .rela.plt. */ 2556 if (strcmp (name, ".rela.plt") != 0) 2557 { 2558 const char * outname; 2559 2560 relocs = TRUE; 2561 2562 /* If this relocation section applies to a read only 2563 section, then we probably need a DT_TEXTREL 2564 entry. The entries in the .rela.plt section 2565 really apply to the .got section, which we 2566 created ourselves and so know is not readonly. */ 2567 outname = bfd_get_section_name (output_bfd, 2568 s->output_section); 2569 target = bfd_get_section_by_name (output_bfd, outname + 5); 2570 if (target != NULL 2571 && (target->flags & SEC_READONLY) != 0 2572 && (target->flags & SEC_ALLOC) != 0) 2573 reltext = TRUE; 2574 } 2575 2576 /* We use the reloc_count field as a counter if we need 2577 to copy relocs into the output file. */ 2578 s->reloc_count = 0; 2579 } 2580 } 2581 else if (! CONST_STRNEQ (name, ".got") 2582 && strcmp (name, ".dynbss") != 0) 2583 /* It's not one of our sections, so don't allocate space. */ 2584 continue; 2585 2586 if (s->size == 0) 2587 { 2588 /* If we don't need this section, strip it from the 2589 output file. This is mostly to handle .rela.bss and 2590 .rela.plt. We must create both sections in 2591 create_dynamic_sections, because they must be created 2592 before the linker maps input sections to output 2593 sections. The linker does that before 2594 adjust_dynamic_symbol is called, and it is that 2595 function which decides whether anything needs to go 2596 into these sections. */ 2597 s->flags |= SEC_EXCLUDE; 2598 continue; 2599 } 2600 2601 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2602 continue; 2603 2604 /* Allocate memory for the section contents. We use bfd_zalloc 2605 here in case unused entries are not reclaimed before the 2606 section's contents are written out. This should not happen, 2607 but this way if it does, we get a R_CR16_NONE reloc 2608 instead of garbage. */ 2609 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2610 if (s->contents == NULL) 2611 return FALSE; 2612 } 2613 2614 if (elf_hash_table (info)->dynamic_sections_created) 2615 { 2616 /* Add some entries to the .dynamic section. We fill in the 2617 values later, in _bfd_cr16_elf_finish_dynamic_sections, 2618 but we must add the entries now so that we get the correct 2619 size for the .dynamic section. The DT_DEBUG entry is filled 2620 in by the dynamic linker and used by the debugger. */ 2621 if (! info->executable) 2622 { 2623 if (!_bfd_elf_add_dynamic_entry (info, DT_DEBUG, 0)) 2624 return FALSE; 2625 } 2626 2627 if (plt) 2628 { 2629 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0) 2630 || !_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0) 2631 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_RELA) 2632 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0)) 2633 return FALSE; 2634 } 2635 2636 if (relocs) 2637 { 2638 if (!_bfd_elf_add_dynamic_entry (info, DT_RELA, 0) 2639 || !_bfd_elf_add_dynamic_entry (info, DT_RELASZ, 0) 2640 || !_bfd_elf_add_dynamic_entry (info, DT_RELAENT, 2641 sizeof (Elf32_External_Rela))) 2642 return FALSE; 2643 } 2644 2645 if (reltext) 2646 { 2647 if (!_bfd_elf_add_dynamic_entry (info, DT_TEXTREL, 0)) 2648 return FALSE; 2649 } 2650 } 2651 2652 return TRUE; 2653} 2654 2655/* Finish up dynamic symbol handling. We set the contents of various 2656 dynamic sections here. */ 2657 2658static bfd_boolean 2659_bfd_cr16_elf_finish_dynamic_symbol (bfd * output_bfd, 2660 struct bfd_link_info * info, 2661 struct elf_link_hash_entry * h, 2662 Elf_Internal_Sym * sym) 2663{ 2664 bfd * dynobj; 2665 2666 dynobj = elf_hash_table (info)->dynobj; 2667 2668 if (h->got.offset != (bfd_vma) -1) 2669 { 2670 asection * sgot; 2671 asection * srel; 2672 Elf_Internal_Rela rel; 2673 2674 /* This symbol has an entry in the global offset table. Set it up. */ 2675 2676 sgot = bfd_get_section_by_name (dynobj, ".got"); 2677 srel = bfd_get_section_by_name (dynobj, ".rela.got"); 2678 BFD_ASSERT (sgot != NULL && srel != NULL); 2679 2680 rel.r_offset = (sgot->output_section->vma 2681 + sgot->output_offset 2682 + (h->got.offset & ~1)); 2683 2684 /* If this is a -Bsymbolic link, and the symbol is defined 2685 locally, we just want to emit a RELATIVE reloc. Likewise if 2686 the symbol was forced to be local because of a version file. 2687 The entry in the global offset table will already have been 2688 initialized in the relocate_section function. */ 2689 if (info->executable 2690 && (info->symbolic || h->dynindx == -1) 2691 && h->def_regular) 2692 { 2693 rel.r_info = ELF32_R_INFO (0, R_CR16_GOT_REGREL20); 2694 rel.r_addend = (h->root.u.def.value 2695 + h->root.u.def.section->output_section->vma 2696 + h->root.u.def.section->output_offset); 2697 } 2698 else 2699 { 2700 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); 2701 rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20); 2702 rel.r_addend = 0; 2703 } 2704 2705 bfd_elf32_swap_reloca_out (output_bfd, &rel, 2706 (bfd_byte *) ((Elf32_External_Rela *) srel->contents 2707 + srel->reloc_count)); 2708 ++ srel->reloc_count; 2709 } 2710 2711 if (h->needs_copy) 2712 { 2713 asection * s; 2714 Elf_Internal_Rela rel; 2715 2716 /* This symbol needs a copy reloc. Set it up. */ 2717 BFD_ASSERT (h->dynindx != -1 2718 && (h->root.type == bfd_link_hash_defined 2719 || h->root.type == bfd_link_hash_defweak)); 2720 2721 s = bfd_get_section_by_name (h->root.u.def.section->owner, 2722 ".rela.bss"); 2723 BFD_ASSERT (s != NULL); 2724 2725 rel.r_offset = (h->root.u.def.value 2726 + h->root.u.def.section->output_section->vma 2727 + h->root.u.def.section->output_offset); 2728 rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20); 2729 rel.r_addend = 0; 2730 bfd_elf32_swap_reloca_out (output_bfd, &rel, 2731 (bfd_byte *) ((Elf32_External_Rela *) s->contents 2732 + s->reloc_count)); 2733 ++ s->reloc_count; 2734 } 2735 2736 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 2737 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 2738 || h == elf_hash_table (info)->hgot) 2739 sym->st_shndx = SHN_ABS; 2740 2741 return TRUE; 2742} 2743 2744/* Finish up the dynamic sections. */ 2745 2746static bfd_boolean 2747_bfd_cr16_elf_finish_dynamic_sections (bfd * output_bfd, 2748 struct bfd_link_info * info) 2749{ 2750 bfd * dynobj; 2751 asection * sgot; 2752 asection * sdyn; 2753 2754 dynobj = elf_hash_table (info)->dynobj; 2755 2756 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 2757 BFD_ASSERT (sgot != NULL); 2758 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 2759 2760 if (elf_hash_table (info)->dynamic_sections_created) 2761 { 2762 Elf32_External_Dyn * dyncon; 2763 Elf32_External_Dyn * dynconend; 2764 2765 BFD_ASSERT (sdyn != NULL); 2766 2767 dyncon = (Elf32_External_Dyn *) sdyn->contents; 2768 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 2769 2770 for (; dyncon < dynconend; dyncon++) 2771 { 2772 Elf_Internal_Dyn dyn; 2773 const char * name; 2774 asection * s; 2775 2776 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 2777 2778 switch (dyn.d_tag) 2779 { 2780 default: 2781 break; 2782 2783 case DT_PLTGOT: 2784 name = ".got"; 2785 goto get_vma; 2786 2787 case DT_JMPREL: 2788 name = ".rela.plt"; 2789 get_vma: 2790 s = bfd_get_section_by_name (output_bfd, name); 2791 BFD_ASSERT (s != NULL); 2792 dyn.d_un.d_ptr = s->vma; 2793 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2794 break; 2795 2796 case DT_PLTRELSZ: 2797 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2798 BFD_ASSERT (s != NULL); 2799 dyn.d_un.d_val = s->size; 2800 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2801 break; 2802 2803 case DT_RELASZ: 2804 /* My reading of the SVR4 ABI indicates that the 2805 procedure linkage table relocs (DT_JMPREL) should be 2806 included in the overall relocs (DT_RELA). This is 2807 what Solaris does. However, UnixWare can not handle 2808 that case. Therefore, we override the DT_RELASZ entry 2809 here to make it not include the JMPREL relocs. Since 2810 the linker script arranges for .rela.plt to follow all 2811 other relocation sections, we don't have to worry 2812 about changing the DT_RELA entry. */ 2813 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2814 if (s != NULL) 2815 dyn.d_un.d_val -= s->size; 2816 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2817 break; 2818 } 2819 } 2820 2821 } 2822 2823 /* Fill in the first three entries in the global offset table. */ 2824 if (sgot->size > 0) 2825 { 2826 if (sdyn == NULL) 2827 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2828 else 2829 bfd_put_32 (output_bfd, 2830 sdyn->output_section->vma + sdyn->output_offset, 2831 sgot->contents); 2832 } 2833 2834 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2835 2836 return TRUE; 2837} 2838 2839/* Given a .data.rel section and a .emreloc in-memory section, store 2840 relocation information into the .emreloc section which can be 2841 used at runtime to relocate the section. This is called by the 2842 linker when the --embedded-relocs switch is used. This is called 2843 after the add_symbols entry point has been called for all the 2844 objects, and before the final_link entry point is called. */ 2845 2846bfd_boolean 2847bfd_cr16_elf32_create_embedded_relocs (bfd *abfd, 2848 struct bfd_link_info *info, 2849 asection *datasec, 2850 asection *relsec, 2851 char **errmsg) 2852{ 2853 Elf_Internal_Shdr *symtab_hdr; 2854 Elf_Internal_Sym *isymbuf = NULL; 2855 Elf_Internal_Rela *internal_relocs = NULL; 2856 Elf_Internal_Rela *irel, *irelend; 2857 bfd_byte *p; 2858 bfd_size_type amt; 2859 2860 BFD_ASSERT (! info->relocatable); 2861 2862 *errmsg = NULL; 2863 2864 if (datasec->reloc_count == 0) 2865 return TRUE; 2866 2867 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2868 2869 /* Get a copy of the native relocations. */ 2870 internal_relocs = (_bfd_elf_link_read_relocs 2871 (abfd, datasec, NULL, NULL, info->keep_memory)); 2872 if (internal_relocs == NULL) 2873 goto error_return; 2874 2875 amt = (bfd_size_type) datasec->reloc_count * 8; 2876 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 2877 if (relsec->contents == NULL) 2878 goto error_return; 2879 2880 p = relsec->contents; 2881 2882 irelend = internal_relocs + datasec->reloc_count; 2883 for (irel = internal_relocs; irel < irelend; irel++, p += 8) 2884 { 2885 asection *targetsec; 2886 2887 /* We are going to write a four byte longword into the runtime 2888 reloc section. The longword will be the address in the data 2889 section which must be relocated. It is followed by the name 2890 of the target section NUL-padded or truncated to 8 2891 characters. */ 2892 2893 /* We can only relocate absolute longword relocs at run time. */ 2894 if (!((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a) 2895 || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32))) 2896 { 2897 *errmsg = _("unsupported reloc type"); 2898 bfd_set_error (bfd_error_bad_value); 2899 goto error_return; 2900 } 2901 2902 /* Get the target section referred to by the reloc. */ 2903 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2904 { 2905 /* A local symbol. */ 2906 Elf_Internal_Sym *isym; 2907 2908 /* Read this BFD's local symbols if we haven't done so already. */ 2909 if (isymbuf == NULL) 2910 { 2911 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2912 if (isymbuf == NULL) 2913 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2914 symtab_hdr->sh_info, 0, 2915 NULL, NULL, NULL); 2916 if (isymbuf == NULL) 2917 goto error_return; 2918 } 2919 2920 isym = isymbuf + ELF32_R_SYM (irel->r_info); 2921 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2922 } 2923 else 2924 { 2925 unsigned long indx; 2926 struct elf_link_hash_entry *h; 2927 2928 /* An external symbol. */ 2929 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2930 h = elf_sym_hashes (abfd)[indx]; 2931 BFD_ASSERT (h != NULL); 2932 if (h->root.type == bfd_link_hash_defined 2933 || h->root.type == bfd_link_hash_defweak) 2934 targetsec = h->root.u.def.section; 2935 else 2936 targetsec = NULL; 2937 } 2938 2939 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 2940 memset (p + 4, 0, 4); 2941 if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a) 2942 && (targetsec != NULL) ) 2943 strncpy ((char *) p + 4, targetsec->output_section->name, 4); 2944 } 2945 2946 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 2947 free (isymbuf); 2948 if (internal_relocs != NULL 2949 && elf_section_data (datasec)->relocs != internal_relocs) 2950 free (internal_relocs); 2951 return TRUE; 2952 2953error_return: 2954 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 2955 free (isymbuf); 2956 if (internal_relocs != NULL 2957 && elf_section_data (datasec)->relocs != internal_relocs) 2958 free (internal_relocs); 2959 return FALSE; 2960} 2961 2962 2963/* Classify relocation types, such that combreloc can sort them 2964 properly. */ 2965 2966static enum elf_reloc_type_class 2967_bfd_cr16_elf_reloc_type_class (const Elf_Internal_Rela *rela) 2968{ 2969 switch ((int) ELF32_R_TYPE (rela->r_info)) 2970 { 2971 case R_CR16_GOT_REGREL20: 2972 case R_CR16_GOTC_REGREL20: 2973 return reloc_class_relative; 2974 default: 2975 return reloc_class_normal; 2976 } 2977} 2978 2979/* Definitions for setting CR16 target vector. */ 2980#define TARGET_LITTLE_SYM bfd_elf32_cr16_vec 2981#define TARGET_LITTLE_NAME "elf32-cr16" 2982#define ELF_ARCH bfd_arch_cr16 2983#define ELF_MACHINE_CODE EM_CR16 2984#define ELF_MACHINE_ALT1 EM_CR16_OLD 2985#define ELF_MAXPAGESIZE 0x1 2986#define elf_symbol_leading_char '_' 2987 2988#define bfd_elf32_bfd_reloc_type_lookup elf_cr16_reloc_type_lookup 2989#define bfd_elf32_bfd_reloc_name_lookup elf_cr16_reloc_name_lookup 2990#define elf_info_to_howto elf_cr16_info_to_howto 2991#define elf_info_to_howto_rel 0 2992#define elf_backend_relocate_section elf32_cr16_relocate_section 2993#define bfd_elf32_bfd_relax_section elf32_cr16_relax_section 2994#define bfd_elf32_bfd_get_relocated_section_contents \ 2995 elf32_cr16_get_relocated_section_contents 2996#define elf_backend_gc_mark_hook elf32_cr16_gc_mark_hook 2997#define elf_backend_gc_sweep_hook elf32_cr16_gc_sweep_hook 2998#define elf_backend_can_gc_sections 1 2999#define elf_backend_rela_normal 1 3000#define elf_backend_check_relocs cr16_elf_check_relocs 3001/* So we can set bits in e_flags. */ 3002#define elf_backend_final_write_processing \ 3003 _bfd_cr16_elf_final_write_processing 3004#define elf_backend_object_p _bfd_cr16_elf_object_p 3005 3006#define bfd_elf32_bfd_merge_private_bfd_data \ 3007 _bfd_cr16_elf_merge_private_bfd_data 3008 3009 3010#define bfd_elf32_bfd_link_hash_table_create \ 3011 elf32_cr16_link_hash_table_create 3012#define bfd_elf32_bfd_link_hash_table_free \ 3013 elf32_cr16_link_hash_table_free 3014 3015#define elf_backend_create_dynamic_sections \ 3016 _bfd_cr16_elf_create_dynamic_sections 3017#define elf_backend_adjust_dynamic_symbol \ 3018 _bfd_cr16_elf_adjust_dynamic_symbol 3019#define elf_backend_size_dynamic_sections \ 3020 _bfd_cr16_elf_size_dynamic_sections 3021#define elf_backend_omit_section_dynsym \ 3022 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 3023#define elf_backend_finish_dynamic_symbol \ 3024 _bfd_cr16_elf_finish_dynamic_symbol 3025#define elf_backend_finish_dynamic_sections \ 3026 _bfd_cr16_elf_finish_dynamic_sections 3027 3028#define elf_backend_reloc_type_class _bfd_cr16_elf_reloc_type_class 3029 3030 3031#define elf_backend_want_got_plt 1 3032#define elf_backend_plt_readonly 1 3033#define elf_backend_want_plt_sym 0 3034#define elf_backend_got_header_size 12 3035 3036#include "elf32-target.h" 3037