1 /* BFD back-end for National Semiconductor's CR16 ELF 2 Copyright 2007, 2008, 2009, 2010, 2012 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 35 struct 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 72 struct 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 78 static 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 }; 113 114 static 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. */ 577 578 static 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_linker_section (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_anyway_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_anyway_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. */ 639 640 static reloc_howto_type * 641 elf_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 } 653 654 static reloc_howto_type * 655 elf_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. */ 669 670 static void 671 elf_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. */ 683 684 static bfd_boolean 685 cr16_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_linker_section (dynobj, ".got"); 756 BFD_ASSERT (sgot != NULL); 757 } 758 759 if (srelgot == NULL 760 && (h != NULL || info->executable)) 761 { 762 srelgot = bfd_get_linker_section (dynobj, ".rela.got"); 763 if (srelgot == NULL) 764 { 765 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS 766 | SEC_IN_MEMORY | SEC_LINKER_CREATED 767 | SEC_READONLY); 768 srelgot = bfd_make_section_anyway_with_flags (dynobj, 769 ".rela.got", 770 flags); 771 if (srelgot == NULL 772 || ! bfd_set_section_alignment (dynobj, srelgot, 2)) 773 goto fail; 774 } 775 } 776 777 if (h != NULL) 778 { 779 if (h->got.offset != (bfd_vma) -1) 780 /* We have already allocated space in the .got. */ 781 break; 782 783 h->got.offset = sgot->size; 784 785 /* Make sure this symbol is output as a dynamic symbol. */ 786 if (h->dynindx == -1) 787 { 788 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 789 goto fail; 790 } 791 792 srelgot->size += sizeof (Elf32_External_Rela); 793 } 794 else 795 { 796 /* This is a global offset table entry for a local 797 symbol. */ 798 if (local_got_offsets == NULL) 799 { 800 size_t size; 801 unsigned int i; 802 803 size = symtab_hdr->sh_info * sizeof (bfd_vma); 804 local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); 805 806 if (local_got_offsets == NULL) 807 goto fail; 808 809 elf_local_got_offsets (abfd) = local_got_offsets; 810 811 for (i = 0; i < symtab_hdr->sh_info; i++) 812 local_got_offsets[i] = (bfd_vma) -1; 813 } 814 815 if (local_got_offsets[r_symndx] != (bfd_vma) -1) 816 /* We have already allocated space in the .got. */ 817 break; 818 819 local_got_offsets[r_symndx] = sgot->size; 820 821 if (info->executable) 822 /* If we are generating a shared object, we need to 823 output a R_CR16_RELATIVE reloc so that the dynamic 824 linker can adjust this GOT entry. */ 825 srelgot->size += sizeof (Elf32_External_Rela); 826 } 827 828 sgot->size += 4; 829 break; 830 831 } 832 } 833 834 result = TRUE; 835 fail: 836 if (isymbuf != NULL) 837 free (isymbuf); 838 839 return result; 840 } 841 842 /* Perform a relocation as part of a final link. */ 843 844 static bfd_reloc_status_type 845 cr16_elf_final_link_relocate (reloc_howto_type *howto, 846 bfd *input_bfd, 847 bfd *output_bfd ATTRIBUTE_UNUSED, 848 asection *input_section, 849 bfd_byte *contents, 850 bfd_vma offset, 851 bfd_vma Rvalue, 852 bfd_vma addend, 853 struct elf_link_hash_entry * h, 854 unsigned long symndx ATTRIBUTE_UNUSED, 855 struct bfd_link_info *info ATTRIBUTE_UNUSED, 856 asection *sec ATTRIBUTE_UNUSED, 857 int is_local ATTRIBUTE_UNUSED) 858 { 859 unsigned short r_type = howto->type; 860 bfd_byte *hit_data = contents + offset; 861 bfd_vma reloc_bits, check, Rvalue1; 862 bfd * dynobj; 863 864 dynobj = elf_hash_table (info)->dynobj; 865 866 switch (r_type) 867 { 868 case R_CR16_IMM4: 869 case R_CR16_IMM20: 870 case R_CR16_ABS20: 871 break; 872 873 case R_CR16_IMM8: 874 case R_CR16_IMM16: 875 case R_CR16_IMM32: 876 case R_CR16_IMM32a: 877 case R_CR16_REGREL4: 878 case R_CR16_REGREL4a: 879 case R_CR16_REGREL14: 880 case R_CR16_REGREL14a: 881 case R_CR16_REGREL16: 882 case R_CR16_REGREL20: 883 case R_CR16_REGREL20a: 884 case R_CR16_GOT_REGREL20: 885 case R_CR16_GOTC_REGREL20: 886 case R_CR16_ABS24: 887 case R_CR16_DISP16: 888 case R_CR16_DISP24: 889 /* 'hit_data' is relative to the start of the instruction, not the 890 relocation offset. Advance it to account for the exact offset. */ 891 hit_data += 2; 892 break; 893 894 case R_CR16_NONE: 895 return bfd_reloc_ok; 896 break; 897 898 case R_CR16_DISP4: 899 if (is_local) 900 Rvalue += -1; 901 break; 902 903 case R_CR16_DISP8: 904 case R_CR16_DISP24a: 905 if (is_local) 906 Rvalue -= -1; 907 break; 908 909 case R_CR16_SWITCH8: 910 case R_CR16_SWITCH16: 911 case R_CR16_SWITCH32: 912 /* We only care about the addend, where the difference between 913 expressions is kept. */ 914 Rvalue = 0; 915 916 default: 917 break; 918 } 919 920 if (howto->pc_relative) 921 { 922 /* Subtract the address of the section containing the location. */ 923 Rvalue -= (input_section->output_section->vma 924 + input_section->output_offset); 925 /* Subtract the position of the location within the section. */ 926 Rvalue -= offset; 927 } 928 929 /* Add in supplied addend. */ 930 Rvalue += addend; 931 932 /* Complain if the bitfield overflows, whether it is considered 933 as signed or unsigned. */ 934 check = Rvalue >> howto->rightshift; 935 936 /* Assumes two's complement. This expression avoids 937 overflow if howto->bitsize is the number of bits in 938 bfd_vma. */ 939 reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; 940 941 /* For GOT and GOTC relocs no boundary checks applied. */ 942 if (!((r_type == R_CR16_GOT_REGREL20) 943 || (r_type == R_CR16_GOTC_REGREL20))) 944 { 945 if (((bfd_vma) check & ~reloc_bits) != 0 946 && (((bfd_vma) check & ~reloc_bits) 947 != (-(bfd_vma) 1 & ~reloc_bits))) 948 { 949 /* The above right shift is incorrect for a signed 950 value. See if turning on the upper bits fixes the 951 overflow. */ 952 if (howto->rightshift && (bfd_signed_vma) Rvalue < 0) 953 { 954 check |= ((bfd_vma) - 1 955 & ~((bfd_vma) - 1 956 >> howto->rightshift)); 957 958 if (((bfd_vma) check & ~reloc_bits) 959 != (-(bfd_vma) 1 & ~reloc_bits)) 960 return bfd_reloc_overflow; 961 } 962 else 963 return bfd_reloc_overflow; 964 } 965 966 /* Drop unwanted bits from the value we are relocating to. */ 967 Rvalue >>= (bfd_vma) howto->rightshift; 968 969 /* Apply dst_mask to select only relocatable part of the insn. */ 970 Rvalue &= howto->dst_mask; 971 } 972 973 switch (howto->size) 974 { 975 case 0: 976 if (r_type == R_CR16_DISP8) 977 { 978 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 979 Rvalue = ((Rvalue1 & 0xf000) | ((Rvalue << 4) & 0xf00) 980 | (Rvalue1 & 0x00f0) | (Rvalue & 0xf)); 981 bfd_put_16 (input_bfd, Rvalue, hit_data); 982 } 983 else if (r_type == R_CR16_IMM4) 984 { 985 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 986 Rvalue = (((Rvalue1 & 0xff) << 8) | ((Rvalue << 4) & 0xf0) 987 | ((Rvalue1 & 0x0f00) >> 8)); 988 bfd_put_16 (input_bfd, Rvalue, hit_data); 989 } 990 else if (r_type == R_CR16_DISP4) 991 { 992 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 993 Rvalue = (Rvalue1 | ((Rvalue & 0xf) << 4)); 994 bfd_put_16 (input_bfd, Rvalue, hit_data); 995 } 996 else 997 { 998 bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data); 999 } 1000 break; 1001 1002 case 1: 1003 if (r_type == R_CR16_DISP16) 1004 { 1005 Rvalue |= (bfd_get_16 (input_bfd, hit_data)); 1006 Rvalue = ((Rvalue & 0xfffe) | ((Rvalue >> 16) & 0x1)); 1007 } 1008 if (r_type == R_CR16_IMM16) 1009 { 1010 Rvalue1 = bfd_get_16 (input_bfd, hit_data); 1011 1012 /* Add or subtract the offset value. */ 1013 if (Rvalue1 & 0x8000) 1014 Rvalue -= (~Rvalue1 + 1) & 0xffff; 1015 else 1016 Rvalue += Rvalue1; 1017 1018 /* Check for range. */ 1019 if ((long) Rvalue > 0xffff || (long) Rvalue < 0x0) 1020 return bfd_reloc_overflow; 1021 } 1022 1023 bfd_put_16 (input_bfd, Rvalue, hit_data); 1024 break; 1025 1026 case 2: 1027 if ((r_type == R_CR16_ABS20) || (r_type == R_CR16_IMM20)) 1028 { 1029 Rvalue1 = (bfd_get_16 (input_bfd, hit_data + 2) 1030 | (((bfd_get_16 (input_bfd, hit_data) & 0xf) <<16))); 1031 1032 /* Add or subtract the offset value. */ 1033 if (Rvalue1 & 0x80000) 1034 Rvalue -= (~Rvalue1 + 1) & 0xfffff; 1035 else 1036 Rvalue += Rvalue1; 1037 1038 /* Check for range. */ 1039 if ((long) Rvalue > 0xfffff || (long) Rvalue < 0x0) 1040 return bfd_reloc_overflow; 1041 1042 bfd_put_16 (input_bfd, ((bfd_get_16 (input_bfd, hit_data) & 0xfff0) 1043 | ((Rvalue >> 16) & 0xf)), hit_data); 1044 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1045 } 1046 else if (r_type == R_CR16_GOT_REGREL20) 1047 { 1048 asection * sgot = bfd_get_linker_section (dynobj, ".got"); 1049 1050 if (h != NULL) 1051 { 1052 bfd_vma off; 1053 1054 off = h->got.offset; 1055 BFD_ASSERT (off != (bfd_vma) -1); 1056 1057 if (! elf_hash_table (info)->dynamic_sections_created 1058 || SYMBOL_REFERENCES_LOCAL (info, h)) 1059 /* This is actually a static link, or it is a 1060 -Bsymbolic link and the symbol is defined 1061 locally, or the symbol was forced to be local 1062 because of a version file. We must initialize 1063 this entry in the global offset table. 1064 When doing a dynamic link, we create a .rela.got 1065 relocation entry to initialize the value. This 1066 is done in the finish_dynamic_symbol routine. */ 1067 bfd_put_32 (output_bfd, Rvalue, sgot->contents + off); 1068 1069 Rvalue = sgot->output_offset + off; 1070 } 1071 else 1072 { 1073 bfd_vma off; 1074 1075 off = elf_local_got_offsets (input_bfd)[symndx]; 1076 bfd_put_32 (output_bfd,Rvalue, sgot->contents + off); 1077 1078 Rvalue = sgot->output_offset + off; 1079 } 1080 1081 Rvalue += addend; 1082 1083 /* REVISIT: if ((long) Rvalue > 0xffffff || 1084 (long) Rvalue < -0x800000). */ 1085 if ((long) Rvalue > 0xffffff || (long) Rvalue < 0) 1086 return bfd_reloc_overflow; 1087 1088 1089 bfd_put_16 (input_bfd, (bfd_get_16 (input_bfd, hit_data)) 1090 | (((Rvalue >> 16) & 0xf) << 8), hit_data); 1091 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1092 1093 } 1094 else if (r_type == R_CR16_GOTC_REGREL20) 1095 { 1096 asection * sgot; 1097 sgot = bfd_get_linker_section (dynobj, ".got"); 1098 1099 if (h != NULL) 1100 { 1101 bfd_vma off; 1102 1103 off = h->got.offset; 1104 BFD_ASSERT (off != (bfd_vma) -1); 1105 1106 Rvalue >>=1; /* For code symbols. */ 1107 1108 if (! elf_hash_table (info)->dynamic_sections_created 1109 || SYMBOL_REFERENCES_LOCAL (info, h)) 1110 /* This is actually a static link, or it is a 1111 -Bsymbolic link and the symbol is defined 1112 locally, or the symbol was forced to be local 1113 because of a version file. We must initialize 1114 this entry in the global offset table. 1115 When doing a dynamic link, we create a .rela.got 1116 relocation entry to initialize the value. This 1117 is done in the finish_dynamic_symbol routine. */ 1118 bfd_put_32 (output_bfd, Rvalue, sgot->contents + off); 1119 1120 Rvalue = sgot->output_offset + off; 1121 } 1122 else 1123 { 1124 bfd_vma off; 1125 1126 off = elf_local_got_offsets (input_bfd)[symndx]; 1127 Rvalue >>= 1; 1128 bfd_put_32 (output_bfd,Rvalue, sgot->contents + off); 1129 Rvalue = sgot->output_offset + off; 1130 } 1131 1132 Rvalue += addend; 1133 1134 /* Check if any value in DISP. */ 1135 Rvalue1 =((bfd_get_32 (input_bfd, hit_data) >>16) 1136 | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16)); 1137 1138 /* Add or subtract the offset value. */ 1139 if (Rvalue1 & 0x80000) 1140 Rvalue -= (~Rvalue1 + 1) & 0xfffff; 1141 else 1142 Rvalue += Rvalue1; 1143 1144 /* Check for range. */ 1145 /* REVISIT: if ((long) Rvalue > 0xffffff 1146 || (long) Rvalue < -0x800000). */ 1147 if ((long) Rvalue > 0xffffff || (long) Rvalue < 0) 1148 return bfd_reloc_overflow; 1149 1150 bfd_put_16 (input_bfd, (bfd_get_16 (input_bfd, hit_data)) 1151 | (((Rvalue >> 16) & 0xf) << 8), hit_data); 1152 bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2); 1153 } 1154 else 1155 { 1156 if (r_type == R_CR16_ABS24) 1157 { 1158 Rvalue1 = ((bfd_get_32 (input_bfd, hit_data) >> 16) 1159 | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16) 1160 | (((bfd_get_32 (input_bfd, hit_data) & 0xf) <<20))); 1161 1162 /* Add or subtract the offset value. */ 1163 if (Rvalue1 & 0x800000) 1164 Rvalue -= (~Rvalue1 + 1) & 0xffffff; 1165 else 1166 Rvalue += Rvalue1; 1167 1168 /* Check for Range. */ 1169 if ((long) Rvalue > 0xffffff || (long) Rvalue < 0x0) 1170 return bfd_reloc_overflow; 1171 1172 Rvalue = ((((Rvalue >> 20) & 0xf) | (((Rvalue >> 16) & 0xf)<<8) 1173 | (bfd_get_32 (input_bfd, hit_data) & 0xf0f0)) 1174 | ((Rvalue & 0xffff) << 16)); 1175 } 1176 else if (r_type == R_CR16_DISP24) 1177 { 1178 Rvalue = ((((Rvalue >> 20)& 0xf) | (((Rvalue >>16) & 0xf)<<8) 1179 | (bfd_get_16 (input_bfd, hit_data))) 1180 | (((Rvalue & 0xfffe) | ((Rvalue >> 24) & 0x1)) << 16)); 1181 } 1182 else if ((r_type == R_CR16_IMM32) || (r_type == R_CR16_IMM32a)) 1183 { 1184 Rvalue1 =((((bfd_get_32 (input_bfd, hit_data)) >> 16) &0xffff) 1185 | (((bfd_get_32 (input_bfd, hit_data)) &0xffff)) << 16); 1186 1187 /* Add or subtract the offset value. */ 1188 if (Rvalue1 & 0x80000000) 1189 Rvalue -= (~Rvalue1 + 1) & 0xffffffff; 1190 else 1191 Rvalue += Rvalue1; 1192 1193 /* Check for range. */ 1194 if (Rvalue > 0xffffffff || (long) Rvalue < 0x0) 1195 return bfd_reloc_overflow; 1196 1197 Rvalue = (((Rvalue >> 16)& 0xffff) | (Rvalue & 0xffff) << 16); 1198 } 1199 else if (r_type == R_CR16_DISP24a) 1200 { 1201 Rvalue = (((Rvalue & 0xfffffe) | (Rvalue >> 23))); 1202 Rvalue = ((Rvalue >> 16) & 0xff) | ((Rvalue & 0xffff) << 16) 1203 | (bfd_get_32 (input_bfd, hit_data)); 1204 } 1205 else if ((r_type == R_CR16_REGREL20) 1206 || (r_type == R_CR16_REGREL20a)) 1207 { 1208 Rvalue1 = ((bfd_get_32 (input_bfd, hit_data) >> 16) 1209 | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16)); 1210 /* Add or subtract the offset value. */ 1211 if (Rvalue1 & 0x80000) 1212 Rvalue -= (~Rvalue1 + 1) & 0xfffff; 1213 else 1214 Rvalue += Rvalue1; 1215 1216 /* Check for range. */ 1217 if ((long) Rvalue > 0xfffff || (long) Rvalue < 0x0) 1218 return bfd_reloc_overflow; 1219 1220 Rvalue = (((((Rvalue >> 20)& 0xf) | (((Rvalue >>16) & 0xf)<<8) 1221 | ((Rvalue & 0xffff) << 16))) 1222 | (bfd_get_32 (input_bfd, hit_data) & 0xf0ff)); 1223 1224 } 1225 else if (r_type == R_CR16_NUM32) 1226 { 1227 Rvalue1 = (bfd_get_32 (input_bfd, hit_data)); 1228 1229 /* Add or subtract the offset value */ 1230 if (Rvalue1 & 0x80000000) 1231 Rvalue -= (~Rvalue1 + 1) & 0xffffffff; 1232 else 1233 Rvalue += Rvalue1; 1234 1235 /* Check for Ranga */ 1236 if (Rvalue > 0xffffffff) 1237 return bfd_reloc_overflow; 1238 } 1239 1240 bfd_put_32 (input_bfd, Rvalue, hit_data); 1241 } 1242 break; 1243 1244 default: 1245 return bfd_reloc_notsupported; 1246 } 1247 1248 return bfd_reloc_ok; 1249 } 1250 1251 /* Delete some bytes from a section while relaxing. */ 1252 1253 static bfd_boolean 1254 elf32_cr16_relax_delete_bytes (struct bfd_link_info *link_info, bfd *abfd, 1255 asection *sec, bfd_vma addr, int count) 1256 { 1257 Elf_Internal_Shdr *symtab_hdr; 1258 unsigned int sec_shndx; 1259 bfd_byte *contents; 1260 Elf_Internal_Rela *irel, *irelend; 1261 bfd_vma toaddr; 1262 Elf_Internal_Sym *isym; 1263 Elf_Internal_Sym *isymend; 1264 struct elf_link_hash_entry **sym_hashes; 1265 struct elf_link_hash_entry **end_hashes; 1266 struct elf_link_hash_entry **start_hashes; 1267 unsigned int symcount; 1268 1269 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); 1270 1271 contents = elf_section_data (sec)->this_hdr.contents; 1272 1273 toaddr = sec->size; 1274 1275 irel = elf_section_data (sec)->relocs; 1276 irelend = irel + sec->reloc_count; 1277 1278 /* Actually delete the bytes. */ 1279 memmove (contents + addr, contents + addr + count, 1280 (size_t) (toaddr - addr - count)); 1281 sec->size -= count; 1282 1283 /* Adjust all the relocs. */ 1284 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) 1285 /* Get the new reloc address. */ 1286 if ((irel->r_offset > addr && irel->r_offset < toaddr)) 1287 irel->r_offset -= count; 1288 1289 /* Adjust the local symbols defined in this section. */ 1290 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1291 isym = (Elf_Internal_Sym *) symtab_hdr->contents; 1292 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) 1293 { 1294 if (isym->st_shndx == sec_shndx 1295 && isym->st_value > addr 1296 && isym->st_value < toaddr) 1297 { 1298 /* Adjust the addend of SWITCH relocations in this section, 1299 which reference this local symbol. */ 1300 #if 0 1301 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) 1302 { 1303 unsigned long r_symndx; 1304 Elf_Internal_Sym *rsym; 1305 bfd_vma addsym, subsym; 1306 1307 /* Skip if not a SWITCH relocation. */ 1308 if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH8 1309 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH16 1310 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH32) 1311 continue; 1312 1313 r_symndx = ELF32_R_SYM (irel->r_info); 1314 rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx; 1315 1316 /* Skip if not the local adjusted symbol. */ 1317 if (rsym != isym) 1318 continue; 1319 1320 addsym = isym->st_value; 1321 subsym = addsym - irel->r_addend; 1322 1323 /* Fix the addend only when -->> (addsym > addr >= subsym). */ 1324 if (subsym <= addr) 1325 irel->r_addend -= count; 1326 else 1327 continue; 1328 } 1329 #endif 1330 1331 isym->st_value -= count; 1332 } 1333 } 1334 1335 /* Now adjust the global symbols defined in this section. */ 1336 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) 1337 - symtab_hdr->sh_info); 1338 sym_hashes = start_hashes = elf_sym_hashes (abfd); 1339 end_hashes = sym_hashes + symcount; 1340 1341 for (; sym_hashes < end_hashes; sym_hashes++) 1342 { 1343 struct elf_link_hash_entry *sym_hash = *sym_hashes; 1344 1345 /* The '--wrap SYMBOL' option is causing a pain when the object file, 1346 containing the definition of __wrap_SYMBOL, includes a direct 1347 call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference 1348 the same symbol (which is __wrap_SYMBOL), but still exist as two 1349 different symbols in 'sym_hashes', we don't want to adjust 1350 the global symbol __wrap_SYMBOL twice. 1351 This check is only relevant when symbols are being wrapped. */ 1352 if (link_info->wrap_hash != NULL) 1353 { 1354 struct elf_link_hash_entry **cur_sym_hashes; 1355 1356 /* Loop only over the symbols whom been already checked. */ 1357 for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes; 1358 cur_sym_hashes++) 1359 /* If the current symbol is identical to 'sym_hash', that means 1360 the symbol was already adjusted (or at least checked). */ 1361 if (*cur_sym_hashes == sym_hash) 1362 break; 1363 1364 /* Don't adjust the symbol again. */ 1365 if (cur_sym_hashes < sym_hashes) 1366 continue; 1367 } 1368 1369 if ((sym_hash->root.type == bfd_link_hash_defined 1370 || sym_hash->root.type == bfd_link_hash_defweak) 1371 && sym_hash->root.u.def.section == sec 1372 && sym_hash->root.u.def.value > addr 1373 && sym_hash->root.u.def.value < toaddr) 1374 sym_hash->root.u.def.value -= count; 1375 } 1376 1377 return TRUE; 1378 } 1379 1380 /* Relocate a CR16 ELF section. */ 1381 1382 static bfd_boolean 1383 elf32_cr16_relocate_section (bfd *output_bfd, struct bfd_link_info *info, 1384 bfd *input_bfd, asection *input_section, 1385 bfd_byte *contents, Elf_Internal_Rela *relocs, 1386 Elf_Internal_Sym *local_syms, 1387 asection **local_sections) 1388 { 1389 Elf_Internal_Shdr *symtab_hdr; 1390 struct elf_link_hash_entry **sym_hashes; 1391 Elf_Internal_Rela *rel, *relend; 1392 1393 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1394 sym_hashes = elf_sym_hashes (input_bfd); 1395 1396 rel = relocs; 1397 relend = relocs + input_section->reloc_count; 1398 for (; rel < relend; rel++) 1399 { 1400 int r_type; 1401 reloc_howto_type *howto; 1402 unsigned long r_symndx; 1403 Elf_Internal_Sym *sym; 1404 asection *sec; 1405 struct elf_link_hash_entry *h; 1406 bfd_vma relocation; 1407 bfd_reloc_status_type r; 1408 1409 r_symndx = ELF32_R_SYM (rel->r_info); 1410 r_type = ELF32_R_TYPE (rel->r_info); 1411 howto = cr16_elf_howto_table + (r_type); 1412 1413 h = NULL; 1414 sym = NULL; 1415 sec = NULL; 1416 if (r_symndx < symtab_hdr->sh_info) 1417 { 1418 sym = local_syms + r_symndx; 1419 sec = local_sections[r_symndx]; 1420 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1421 } 1422 else 1423 { 1424 bfd_boolean unresolved_reloc, warned; 1425 1426 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1427 r_symndx, symtab_hdr, sym_hashes, 1428 h, sec, relocation, 1429 unresolved_reloc, warned); 1430 } 1431 1432 if (sec != NULL && discarded_section (sec)) 1433 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1434 rel, 1, relend, howto, 0, contents); 1435 1436 if (info->relocatable) 1437 continue; 1438 1439 r = cr16_elf_final_link_relocate (howto, input_bfd, output_bfd, 1440 input_section, 1441 contents, rel->r_offset, 1442 relocation, rel->r_addend, 1443 (struct elf_link_hash_entry *) h, 1444 r_symndx, 1445 info, sec, h == NULL); 1446 1447 if (r != bfd_reloc_ok) 1448 { 1449 const char *name; 1450 const char *msg = NULL; 1451 1452 if (h != NULL) 1453 name = h->root.root.string; 1454 else 1455 { 1456 name = (bfd_elf_string_from_elf_section 1457 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 1458 if (name == NULL || *name == '\0') 1459 name = bfd_section_name (input_bfd, sec); 1460 } 1461 1462 switch (r) 1463 { 1464 case bfd_reloc_overflow: 1465 if (!((*info->callbacks->reloc_overflow) 1466 (info, (h ? &h->root : NULL), name, howto->name, 1467 (bfd_vma) 0, input_bfd, input_section, 1468 rel->r_offset))) 1469 return FALSE; 1470 break; 1471 1472 case bfd_reloc_undefined: 1473 if (!((*info->callbacks->undefined_symbol) 1474 (info, name, input_bfd, input_section, 1475 rel->r_offset, TRUE))) 1476 return FALSE; 1477 break; 1478 1479 case bfd_reloc_outofrange: 1480 msg = _("internal error: out of range error"); 1481 goto common_error; 1482 1483 case bfd_reloc_notsupported: 1484 msg = _("internal error: unsupported relocation error"); 1485 goto common_error; 1486 1487 case bfd_reloc_dangerous: 1488 msg = _("internal error: dangerous error"); 1489 goto common_error; 1490 1491 default: 1492 msg = _("internal error: unknown error"); 1493 /* Fall through. */ 1494 1495 common_error: 1496 if (!((*info->callbacks->warning) 1497 (info, msg, name, input_bfd, input_section, 1498 rel->r_offset))) 1499 return FALSE; 1500 break; 1501 } 1502 } 1503 } 1504 1505 return TRUE; 1506 } 1507 1508 /* This is a version of bfd_generic_get_relocated_section_contents 1509 which uses elf32_cr16_relocate_section. */ 1510 1511 static bfd_byte * 1512 elf32_cr16_get_relocated_section_contents (bfd *output_bfd, 1513 struct bfd_link_info *link_info, 1514 struct bfd_link_order *link_order, 1515 bfd_byte *data, 1516 bfd_boolean relocatable, 1517 asymbol **symbols) 1518 { 1519 Elf_Internal_Shdr *symtab_hdr; 1520 asection *input_section = link_order->u.indirect.section; 1521 bfd *input_bfd = input_section->owner; 1522 asection **sections = NULL; 1523 Elf_Internal_Rela *internal_relocs = NULL; 1524 Elf_Internal_Sym *isymbuf = NULL; 1525 1526 /* We only need to handle the case of relaxing, or of having a 1527 particular set of section contents, specially. */ 1528 if (relocatable 1529 || elf_section_data (input_section)->this_hdr.contents == NULL) 1530 return bfd_generic_get_relocated_section_contents (output_bfd, link_info, 1531 link_order, data, 1532 relocatable, 1533 symbols); 1534 1535 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1536 1537 memcpy (data, elf_section_data (input_section)->this_hdr.contents, 1538 (size_t) input_section->size); 1539 1540 if ((input_section->flags & SEC_RELOC) != 0 1541 && input_section->reloc_count > 0) 1542 { 1543 Elf_Internal_Sym *isym; 1544 Elf_Internal_Sym *isymend; 1545 asection **secpp; 1546 bfd_size_type amt; 1547 1548 internal_relocs = _bfd_elf_link_read_relocs (input_bfd, input_section, 1549 NULL, NULL, FALSE); 1550 if (internal_relocs == NULL) 1551 goto error_return; 1552 1553 if (symtab_hdr->sh_info != 0) 1554 { 1555 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1556 if (isymbuf == NULL) 1557 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, 1558 symtab_hdr->sh_info, 0, 1559 NULL, NULL, NULL); 1560 if (isymbuf == NULL) 1561 goto error_return; 1562 } 1563 1564 amt = symtab_hdr->sh_info; 1565 amt *= sizeof (asection *); 1566 sections = bfd_malloc (amt); 1567 if (sections == NULL && amt != 0) 1568 goto error_return; 1569 1570 isymend = isymbuf + symtab_hdr->sh_info; 1571 for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) 1572 { 1573 asection *isec; 1574 1575 if (isym->st_shndx == SHN_UNDEF) 1576 isec = bfd_und_section_ptr; 1577 else if (isym->st_shndx == SHN_ABS) 1578 isec = bfd_abs_section_ptr; 1579 else if (isym->st_shndx == SHN_COMMON) 1580 isec = bfd_com_section_ptr; 1581 else 1582 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); 1583 1584 *secpp = isec; 1585 } 1586 1587 if (! elf32_cr16_relocate_section (output_bfd, link_info, input_bfd, 1588 input_section, data, internal_relocs, 1589 isymbuf, sections)) 1590 goto error_return; 1591 1592 if (sections != NULL) 1593 free (sections); 1594 if (isymbuf != NULL 1595 && symtab_hdr->contents != (unsigned char *) isymbuf) 1596 free (isymbuf); 1597 if (elf_section_data (input_section)->relocs != internal_relocs) 1598 free (internal_relocs); 1599 } 1600 1601 return data; 1602 1603 error_return: 1604 if (sections != NULL) 1605 free (sections); 1606 if (isymbuf != NULL 1607 && symtab_hdr->contents != (unsigned char *) isymbuf) 1608 free (isymbuf); 1609 if (internal_relocs != NULL 1610 && elf_section_data (input_section)->relocs != internal_relocs) 1611 free (internal_relocs); 1612 return NULL; 1613 } 1614 1615 /* Assorted hash table functions. */ 1616 1617 /* Initialize an entry in the link hash table. */ 1618 1619 /* Create an entry in an CR16 ELF linker hash table. */ 1620 1621 static struct bfd_hash_entry * 1622 elf32_cr16_link_hash_newfunc (struct bfd_hash_entry *entry, 1623 struct bfd_hash_table *table, 1624 const char *string) 1625 { 1626 struct elf32_cr16_link_hash_entry *ret = 1627 (struct elf32_cr16_link_hash_entry *) entry; 1628 1629 /* Allocate the structure if it has not already been allocated by a 1630 subclass. */ 1631 if (ret == (struct elf32_cr16_link_hash_entry *) NULL) 1632 ret = ((struct elf32_cr16_link_hash_entry *) 1633 bfd_hash_allocate (table, 1634 sizeof (struct elf32_cr16_link_hash_entry))); 1635 if (ret == (struct elf32_cr16_link_hash_entry *) NULL) 1636 return (struct bfd_hash_entry *) ret; 1637 1638 /* Call the allocation method of the superclass. */ 1639 ret = ((struct elf32_cr16_link_hash_entry *) 1640 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 1641 table, string)); 1642 if (ret != (struct elf32_cr16_link_hash_entry *) NULL) 1643 { 1644 ret->direct_calls = 0; 1645 ret->stack_size = 0; 1646 ret->movm_args = 0; 1647 ret->movm_stack_size = 0; 1648 ret->flags = 0; 1649 ret->value = 0; 1650 } 1651 1652 return (struct bfd_hash_entry *) ret; 1653 } 1654 1655 /* Create an cr16 ELF linker hash table. */ 1656 1657 static struct bfd_link_hash_table * 1658 elf32_cr16_link_hash_table_create (bfd *abfd) 1659 { 1660 struct elf_link_hash_table *ret; 1661 bfd_size_type amt = sizeof (struct elf_link_hash_table); 1662 1663 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt); 1664 if (ret == (struct elf_link_hash_table *) NULL) 1665 return NULL; 1666 1667 if (!_bfd_elf_link_hash_table_init (ret, abfd, 1668 elf32_cr16_link_hash_newfunc, 1669 sizeof (struct elf32_cr16_link_hash_entry), 1670 GENERIC_ELF_DATA)) 1671 { 1672 free (ret); 1673 return NULL; 1674 } 1675 1676 return &ret->root; 1677 } 1678 1679 static unsigned long 1680 elf_cr16_mach (flagword flags) 1681 { 1682 switch (flags) 1683 { 1684 case EM_CR16: 1685 default: 1686 return bfd_mach_cr16; 1687 } 1688 } 1689 1690 /* The final processing done just before writing out a CR16 ELF object 1691 file. This gets the CR16 architecture right based on the machine 1692 number. */ 1693 1694 static void 1695 _bfd_cr16_elf_final_write_processing (bfd *abfd, 1696 bfd_boolean linker ATTRIBUTE_UNUSED) 1697 { 1698 unsigned long val; 1699 switch (bfd_get_mach (abfd)) 1700 { 1701 default: 1702 case bfd_mach_cr16: 1703 val = EM_CR16; 1704 break; 1705 } 1706 1707 1708 elf_elfheader (abfd)->e_flags |= val; 1709 } 1710 1711 1712 static bfd_boolean 1713 _bfd_cr16_elf_object_p (bfd *abfd) 1714 { 1715 bfd_default_set_arch_mach (abfd, bfd_arch_cr16, 1716 elf_cr16_mach (elf_elfheader (abfd)->e_flags)); 1717 return TRUE; 1718 } 1719 1720 /* Merge backend specific data from an object file to the output 1721 object file when linking. */ 1722 1723 static bfd_boolean 1724 _bfd_cr16_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 1725 { 1726 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1727 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1728 return TRUE; 1729 1730 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) 1731 && bfd_get_mach (obfd) < bfd_get_mach (ibfd)) 1732 { 1733 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), 1734 bfd_get_mach (ibfd))) 1735 return FALSE; 1736 } 1737 1738 return TRUE; 1739 } 1740 1741 1742 /* This function handles relaxing for the CR16. 1743 1744 There's quite a few relaxing opportunites available on the CR16: 1745 1746 * bcond:24 -> bcond:16 1 byte 1747 * bcond:16 -> bcond:8 1 byte 1748 * arithmetic imm32 -> arithmetic imm20 12 bits 1749 * arithmetic imm20/imm16 -> arithmetic imm4 12/16 bits 1750 1751 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 1752 1753 static bfd_boolean 1754 elf32_cr16_relax_section (bfd *abfd, asection *sec, 1755 struct bfd_link_info *link_info, bfd_boolean *again) 1756 { 1757 Elf_Internal_Shdr *symtab_hdr; 1758 Elf_Internal_Rela *internal_relocs; 1759 Elf_Internal_Rela *irel, *irelend; 1760 bfd_byte *contents = NULL; 1761 Elf_Internal_Sym *isymbuf = NULL; 1762 1763 /* Assume nothing changes. */ 1764 *again = FALSE; 1765 1766 /* We don't have to do anything for a relocatable link, if 1767 this section does not have relocs, or if this is not a 1768 code section. */ 1769 if (link_info->relocatable 1770 || (sec->flags & SEC_RELOC) == 0 1771 || sec->reloc_count == 0 1772 || (sec->flags & SEC_CODE) == 0) 1773 return TRUE; 1774 1775 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1776 1777 /* Get a copy of the native relocations. */ 1778 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, 1779 link_info->keep_memory); 1780 if (internal_relocs == NULL) 1781 goto error_return; 1782 1783 /* Walk through them looking for relaxing opportunities. */ 1784 irelend = internal_relocs + sec->reloc_count; 1785 for (irel = internal_relocs; irel < irelend; irel++) 1786 { 1787 bfd_vma symval; 1788 1789 /* If this isn't something that can be relaxed, then ignore 1790 this reloc. */ 1791 if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP16 1792 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP24 1793 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM32 1794 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM20 1795 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM16) 1796 continue; 1797 1798 /* Get the section contents if we haven't done so already. */ 1799 if (contents == NULL) 1800 { 1801 /* Get cached copy if it exists. */ 1802 if (elf_section_data (sec)->this_hdr.contents != NULL) 1803 contents = elf_section_data (sec)->this_hdr.contents; 1804 /* Go get them off disk. */ 1805 else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1806 goto error_return; 1807 } 1808 1809 /* Read this BFD's local symbols if we haven't done so already. */ 1810 if (isymbuf == NULL && symtab_hdr->sh_info != 0) 1811 { 1812 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1813 if (isymbuf == NULL) 1814 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 1815 symtab_hdr->sh_info, 0, 1816 NULL, NULL, NULL); 1817 if (isymbuf == NULL) 1818 goto error_return; 1819 } 1820 1821 /* Get the value of the symbol referred to by the reloc. */ 1822 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 1823 { 1824 /* A local symbol. */ 1825 Elf_Internal_Sym *isym; 1826 asection *sym_sec; 1827 1828 isym = isymbuf + ELF32_R_SYM (irel->r_info); 1829 if (isym->st_shndx == SHN_UNDEF) 1830 sym_sec = bfd_und_section_ptr; 1831 else if (isym->st_shndx == SHN_ABS) 1832 sym_sec = bfd_abs_section_ptr; 1833 else if (isym->st_shndx == SHN_COMMON) 1834 sym_sec = bfd_com_section_ptr; 1835 else 1836 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 1837 symval = (isym->st_value 1838 + sym_sec->output_section->vma 1839 + sym_sec->output_offset); 1840 } 1841 else 1842 { 1843 unsigned long indx; 1844 struct elf_link_hash_entry *h; 1845 1846 /* An external symbol. */ 1847 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 1848 h = elf_sym_hashes (abfd)[indx]; 1849 BFD_ASSERT (h != NULL); 1850 1851 if (h->root.type != bfd_link_hash_defined 1852 && h->root.type != bfd_link_hash_defweak) 1853 /* This appears to be a reference to an undefined 1854 symbol. Just ignore it--it will be caught by the 1855 regular reloc processing. */ 1856 continue; 1857 1858 symval = (h->root.u.def.value 1859 + h->root.u.def.section->output_section->vma 1860 + h->root.u.def.section->output_offset); 1861 } 1862 1863 /* For simplicity of coding, we are going to modify the section 1864 contents, the section relocs, and the BFD symbol table. We 1865 must tell the rest of the code not to free up this 1866 information. It would be possible to instead create a table 1867 of changes which have to be made, as is done in coff-mips.c; 1868 that would be more work, but would require less memory when 1869 the linker is run. */ 1870 1871 /* Try to turn a 24 branch/call into a 16bit relative 1872 branch/call. */ 1873 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP24) 1874 { 1875 bfd_vma value = symval; 1876 1877 /* Deal with pc-relative gunk. */ 1878 value -= (sec->output_section->vma + sec->output_offset); 1879 value -= irel->r_offset; 1880 value += irel->r_addend; 1881 1882 /* See if the value will fit in 16 bits, note the high value is 1883 0xfffe + 2 as the target will be two bytes closer if we are 1884 able to relax. */ 1885 if ((long) value < 0x10000 && (long) value > -0x10002) 1886 { 1887 unsigned int code; 1888 1889 /* Get the opcode. */ 1890 code = (unsigned int) bfd_get_32 (abfd, contents + irel->r_offset); 1891 1892 /* Verify it's a 'bcond' and fix the opcode. */ 1893 if ((code & 0xffff) == 0x0010) 1894 bfd_put_16 (abfd, 0x1800 | ((0xf & (code >> 20)) << 4), contents + irel->r_offset); 1895 else 1896 continue; 1897 1898 /* Note that we've changed the relocs, section contents, etc. */ 1899 elf_section_data (sec)->relocs = internal_relocs; 1900 elf_section_data (sec)->this_hdr.contents = contents; 1901 symtab_hdr->contents = (unsigned char *) isymbuf; 1902 1903 /* Fix the relocation's type. */ 1904 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1905 R_CR16_DISP16); 1906 1907 /* Delete two bytes of data. */ 1908 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1909 irel->r_offset + 2, 2)) 1910 goto error_return; 1911 1912 /* That will change things, so, we should relax again. 1913 Note that this is not required, and it may be slow. */ 1914 *again = TRUE; 1915 } 1916 } 1917 1918 /* Try to turn a 16bit pc-relative branch into an 1919 8bit pc-relative branch. */ 1920 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP16) 1921 { 1922 bfd_vma value = symval; 1923 1924 /* Deal with pc-relative gunk. */ 1925 value -= (sec->output_section->vma + sec->output_offset); 1926 value -= irel->r_offset; 1927 value += irel->r_addend; 1928 1929 /* See if the value will fit in 8 bits, note the high value is 1930 0xfc + 2 as the target will be two bytes closer if we are 1931 able to relax. */ 1932 /*if ((long) value < 0x1fa && (long) value > -0x100) REVISIT:range */ 1933 if ((long) value < 0xfa && (long) value > -0x100) 1934 { 1935 unsigned short code; 1936 1937 /* Get the opcode. */ 1938 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 1939 1940 /* Verify it's a 'bcond' and fix the opcode. */ 1941 if ((code & 0xff0f) == 0x1800) 1942 bfd_put_16 (abfd, (code & 0xf0f0), contents + irel->r_offset); 1943 else 1944 continue; 1945 1946 /* Note that we've changed the relocs, section contents, etc. */ 1947 elf_section_data (sec)->relocs = internal_relocs; 1948 elf_section_data (sec)->this_hdr.contents = contents; 1949 symtab_hdr->contents = (unsigned char *) isymbuf; 1950 1951 /* Fix the relocation's type. */ 1952 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1953 R_CR16_DISP8); 1954 1955 /* Delete two bytes of data. */ 1956 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1957 irel->r_offset + 2, 2)) 1958 goto error_return; 1959 1960 /* That will change things, so, we should relax again. 1961 Note that this is not required, and it may be slow. */ 1962 *again = TRUE; 1963 } 1964 } 1965 1966 /* Try to turn a 32-bit IMM address into a 20/16-bit IMM address */ 1967 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM32) 1968 { 1969 bfd_vma value = symval; 1970 unsigned short is_add_mov = 0; 1971 bfd_vma value1 = 0; 1972 1973 /* Get the existing value from the mcode */ 1974 value1 = ((bfd_get_32 (abfd, contents + irel->r_offset + 2) >> 16) 1975 |(((bfd_get_32 (abfd, contents + irel->r_offset + 2) & 0xffff) << 16))); 1976 1977 /* See if the value will fit in 20 bits. */ 1978 if ((long) (value + value1) < 0xfffff && (long) (value + value1) > 0) 1979 { 1980 unsigned short code; 1981 1982 /* Get the opcode. */ 1983 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 1984 1985 /* Verify it's a 'arithmetic ADDD or MOVD instruction'. 1986 For ADDD and MOVD only, convert to IMM32 -> IMM20. */ 1987 1988 if (((code & 0xfff0) == 0x0070) || ((code & 0xfff0) == 0x0020)) 1989 is_add_mov = 1; 1990 1991 if (is_add_mov) 1992 { 1993 /* Note that we've changed the relocs, section contents, 1994 etc. */ 1995 elf_section_data (sec)->relocs = internal_relocs; 1996 elf_section_data (sec)->this_hdr.contents = contents; 1997 symtab_hdr->contents = (unsigned char *) isymbuf; 1998 1999 /* Fix the opcode. */ 2000 if ((code & 0xfff0) == 0x0070) /* For movd. */ 2001 bfd_put_8 (abfd, 0x05, contents + irel->r_offset + 1); 2002 else /* code == 0x0020 for addd. */ 2003 bfd_put_8 (abfd, 0x04, contents + irel->r_offset + 1); 2004 2005 bfd_put_8 (abfd, (code & 0xf) << 4, contents + irel->r_offset); 2006 2007 /* If existing value is nagavive adjust approriately 2008 place the 16-20bits (ie 4 bit) in new opcode, 2009 as the 0xffffxxxx, the higher 2 byte values removed. */ 2010 if (value1 & 0x80000000) 2011 bfd_put_8 (abfd, (0x0f | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2012 else 2013 bfd_put_8 (abfd, (((value1 >> 16)&0xf) | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2014 2015 /* Fix the relocation's type. */ 2016 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2017 R_CR16_IMM20); 2018 2019 /* Delete two bytes of data. */ 2020 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2021 irel->r_offset + 2, 2)) 2022 goto error_return; 2023 2024 /* That will change things, so, we should relax again. 2025 Note that this is not required, and it may be slow. */ 2026 *again = TRUE; 2027 } 2028 } 2029 2030 /* See if the value will fit in 16 bits. */ 2031 if ((!is_add_mov) 2032 && ((long)(value + value1) < 0x7fff && (long)(value + value1) > 0)) 2033 { 2034 unsigned short code; 2035 2036 /* Get the opcode. */ 2037 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 2038 2039 /* Note that we've changed the relocs, section contents, etc. */ 2040 elf_section_data (sec)->relocs = internal_relocs; 2041 elf_section_data (sec)->this_hdr.contents = contents; 2042 symtab_hdr->contents = (unsigned char *) isymbuf; 2043 2044 /* Fix the opcode. */ 2045 if ((code & 0xf0) == 0x70) /* For movd. */ 2046 bfd_put_8 (abfd, 0x54, contents + irel->r_offset + 1); 2047 else if ((code & 0xf0) == 0x20) /* For addd. */ 2048 bfd_put_8 (abfd, 0x60, contents + irel->r_offset + 1); 2049 else if ((code & 0xf0) == 0x90) /* For cmpd. */ 2050 bfd_put_8 (abfd, 0x56, contents + irel->r_offset + 1); 2051 else 2052 continue; 2053 2054 bfd_put_8 (abfd, 0xb0 | (code & 0xf), contents + irel->r_offset); 2055 2056 /* If existing value is nagavive adjust approriately 2057 place the 12-16bits (ie 4 bit) in new opcode, 2058 as the 0xfffffxxx, the higher 2 byte values removed. */ 2059 if (value1 & 0x80000000) 2060 bfd_put_8 (abfd, (0x0f | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2061 else 2062 bfd_put_16 (abfd, value1, contents + irel->r_offset + 2); 2063 2064 2065 /* Fix the relocation's type. */ 2066 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2067 R_CR16_IMM16); 2068 2069 /* Delete two bytes of data. */ 2070 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2071 irel->r_offset + 2, 2)) 2072 goto error_return; 2073 2074 /* That will change things, so, we should relax again. 2075 Note that this is not required, and it may be slow. */ 2076 *again = TRUE; 2077 } 2078 } 2079 2080 #if 0 2081 /* Try to turn a 16bit immediate address into a 4bit 2082 immediate address. */ 2083 if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20) 2084 || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM16)) 2085 { 2086 bfd_vma value = symval; 2087 bfd_vma value1 = 0; 2088 2089 /* Get the existing value from the mcode */ 2090 value1 = ((bfd_get_16 (abfd, contents + irel->r_offset + 2) & 0xffff)); 2091 2092 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20) 2093 { 2094 value1 |= ((bfd_get_16 (abfd, contents + irel->r_offset + 1) & 0xf000) << 0x4); 2095 } 2096 2097 /* See if the value will fit in 4 bits. */ 2098 if ((((long) (value + value1)) < 0xf) 2099 && (((long) (value + value1)) > 0)) 2100 { 2101 unsigned short code; 2102 2103 /* Get the opcode. */ 2104 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 2105 2106 /* Note that we've changed the relocs, section contents, etc. */ 2107 elf_section_data (sec)->relocs = internal_relocs; 2108 elf_section_data (sec)->this_hdr.contents = contents; 2109 symtab_hdr->contents = (unsigned char *) isymbuf; 2110 2111 /* Fix the opcode. */ 2112 if (((code & 0x0f00) == 0x0400) || ((code & 0x0f00) == 0x0500)) 2113 { 2114 if ((code & 0x0f00) == 0x0400) /* For movd imm20. */ 2115 bfd_put_8 (abfd, 0x60, contents + irel->r_offset); 2116 else /* For addd imm20. */ 2117 bfd_put_8 (abfd, 0x54, contents + irel->r_offset); 2118 bfd_put_8 (abfd, (code & 0xf0) >> 4, contents + irel->r_offset + 1); 2119 } 2120 else 2121 { 2122 if ((code & 0xfff0) == 0x56b0) /* For cmpd imm16. */ 2123 bfd_put_8 (abfd, 0x56, contents + irel->r_offset); 2124 else if ((code & 0xfff0) == 0x54b0) /* For movd imm16. */ 2125 bfd_put_8 (abfd, 0x54, contents + irel->r_offset); 2126 else if ((code & 0xfff0) == 0x58b0) /* For movb imm16. */ 2127 bfd_put_8 (abfd, 0x58, contents + irel->r_offset); 2128 else if ((code & 0xfff0) == 0x5Ab0) /* For movw imm16. */ 2129 bfd_put_8 (abfd, 0x5A, contents + irel->r_offset); 2130 else if ((code & 0xfff0) == 0x60b0) /* For addd imm16. */ 2131 bfd_put_8 (abfd, 0x60, contents + irel->r_offset); 2132 else if ((code & 0xfff0) == 0x30b0) /* For addb imm16. */ 2133 bfd_put_8 (abfd, 0x30, contents + irel->r_offset); 2134 else if ((code & 0xfff0) == 0x2Cb0) /* For addub imm16. */ 2135 bfd_put_8 (abfd, 0x2C, contents + irel->r_offset); 2136 else if ((code & 0xfff0) == 0x32b0) /* For adduw imm16. */ 2137 bfd_put_8 (abfd, 0x32, contents + irel->r_offset); 2138 else if ((code & 0xfff0) == 0x38b0) /* For subb imm16. */ 2139 bfd_put_8 (abfd, 0x38, contents + irel->r_offset); 2140 else if ((code & 0xfff0) == 0x3Cb0) /* For subcb imm16. */ 2141 bfd_put_8 (abfd, 0x3C, contents + irel->r_offset); 2142 else if ((code & 0xfff0) == 0x3Fb0) /* For subcw imm16. */ 2143 bfd_put_8 (abfd, 0x3F, contents + irel->r_offset); 2144 else if ((code & 0xfff0) == 0x3Ab0) /* For subw imm16. */ 2145 bfd_put_8 (abfd, 0x3A, contents + irel->r_offset); 2146 else if ((code & 0xfff0) == 0x50b0) /* For cmpb imm16. */ 2147 bfd_put_8 (abfd, 0x50, contents + irel->r_offset); 2148 else if ((code & 0xfff0) == 0x52b0) /* For cmpw imm16. */ 2149 bfd_put_8 (abfd, 0x52, contents + irel->r_offset); 2150 else 2151 continue; 2152 2153 bfd_put_8 (abfd, (code & 0xf), contents + irel->r_offset + 1); 2154 } 2155 2156 /* Fix the relocation's type. */ 2157 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2158 R_CR16_IMM4); 2159 2160 /* Delete two bytes of data. */ 2161 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2162 irel->r_offset + 2, 2)) 2163 goto error_return; 2164 2165 /* That will change things, so, we should relax again. 2166 Note that this is not required, and it may be slow. */ 2167 *again = TRUE; 2168 } 2169 } 2170 #endif 2171 } 2172 2173 if (isymbuf != NULL 2174 && symtab_hdr->contents != (unsigned char *) isymbuf) 2175 { 2176 if (! link_info->keep_memory) 2177 free (isymbuf); 2178 else 2179 /* Cache the symbols for elf_link_input_bfd. */ 2180 symtab_hdr->contents = (unsigned char *) isymbuf; 2181 } 2182 2183 if (contents != NULL 2184 && elf_section_data (sec)->this_hdr.contents != contents) 2185 { 2186 if (! link_info->keep_memory) 2187 free (contents); 2188 else 2189 /* Cache the section contents for elf_link_input_bfd. */ 2190 elf_section_data (sec)->this_hdr.contents = contents; 2191 2192 } 2193 2194 if (internal_relocs != NULL 2195 && elf_section_data (sec)->relocs != internal_relocs) 2196 free (internal_relocs); 2197 2198 return TRUE; 2199 2200 error_return: 2201 if (isymbuf != NULL 2202 && symtab_hdr->contents != (unsigned char *) isymbuf) 2203 free (isymbuf); 2204 if (contents != NULL 2205 && elf_section_data (sec)->this_hdr.contents != contents) 2206 free (contents); 2207 if (internal_relocs != NULL 2208 && elf_section_data (sec)->relocs != internal_relocs) 2209 free (internal_relocs); 2210 2211 return FALSE; 2212 } 2213 2214 static asection * 2215 elf32_cr16_gc_mark_hook (asection *sec, 2216 struct bfd_link_info *info, 2217 Elf_Internal_Rela *rel, 2218 struct elf_link_hash_entry *h, 2219 Elf_Internal_Sym *sym) 2220 { 2221 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2222 } 2223 2224 /* Update the got entry reference counts for the section being removed. */ 2225 2226 static bfd_boolean 2227 elf32_cr16_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, 2228 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2229 asection *sec ATTRIBUTE_UNUSED, 2230 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 2231 { 2232 /* We don't support garbage collection of GOT and PLT relocs yet. */ 2233 return TRUE; 2234 } 2235 2236 /* Create dynamic sections when linking against a dynamic object. */ 2237 2238 static bfd_boolean 2239 _bfd_cr16_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 2240 { 2241 flagword flags; 2242 asection * s; 2243 const struct elf_backend_data * bed = get_elf_backend_data (abfd); 2244 int ptralign = 0; 2245 2246 switch (bed->s->arch_size) 2247 { 2248 case 16: 2249 ptralign = 1; 2250 break; 2251 2252 case 32: 2253 ptralign = 2; 2254 break; 2255 2256 default: 2257 bfd_set_error (bfd_error_bad_value); 2258 return FALSE; 2259 } 2260 2261 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and 2262 .rel[a].bss sections. */ 2263 2264 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 2265 | SEC_LINKER_CREATED); 2266 2267 s = bfd_make_section_anyway_with_flags (abfd, 2268 (bed->default_use_rela_p 2269 ? ".rela.plt" : ".rel.plt"), 2270 flags | SEC_READONLY); 2271 if (s == NULL 2272 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2273 return FALSE; 2274 2275 if (! _bfd_cr16_elf_create_got_section (abfd, info)) 2276 return FALSE; 2277 2278 if (bed->want_dynbss) 2279 { 2280 /* The .dynbss section is a place to put symbols which are defined 2281 by dynamic objects, are referenced by regular objects, and are 2282 not functions. We must allocate space for them in the process 2283 image and use a R_*_COPY reloc to tell the dynamic linker to 2284 initialize them at run time. The linker script puts the .dynbss 2285 section into the .bss section of the final image. */ 2286 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss", 2287 SEC_ALLOC | SEC_LINKER_CREATED); 2288 if (s == NULL) 2289 return FALSE; 2290 2291 /* The .rel[a].bss section holds copy relocs. This section is not 2292 normally needed. We need to create it here, though, so that the 2293 linker will map it to an output section. We can't just create it 2294 only if we need it, because we will not know whether we need it 2295 until we have seen all the input files, and the first time the 2296 main linker code calls BFD after examining all the input files 2297 (size_dynamic_sections) the input sections have already been 2298 mapped to the output sections. If the section turns out not to 2299 be needed, we can discard it later. We will never need this 2300 section when generating a shared object, since they do not use 2301 copy relocs. */ 2302 if (! info->executable) 2303 { 2304 s = bfd_make_section_anyway_with_flags (abfd, 2305 (bed->default_use_rela_p 2306 ? ".rela.bss" : ".rel.bss"), 2307 flags | SEC_READONLY); 2308 if (s == NULL 2309 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2310 return FALSE; 2311 } 2312 } 2313 2314 return TRUE; 2315 } 2316 2317 /* Adjust a symbol defined by a dynamic object and referenced by a 2318 regular object. The current definition is in some section of the 2319 dynamic object, but we're not including those sections. We have to 2320 change the definition to something the rest of the link can 2321 understand. */ 2322 2323 static bfd_boolean 2324 _bfd_cr16_elf_adjust_dynamic_symbol (struct bfd_link_info * info, 2325 struct elf_link_hash_entry * h) 2326 { 2327 bfd * dynobj; 2328 asection * s; 2329 2330 dynobj = elf_hash_table (info)->dynobj; 2331 2332 /* Make sure we know what is going on here. */ 2333 BFD_ASSERT (dynobj != NULL 2334 && (h->needs_plt 2335 || h->u.weakdef != NULL 2336 || (h->def_dynamic 2337 && h->ref_regular 2338 && !h->def_regular))); 2339 2340 /* If this is a function, put it in the procedure linkage table. We 2341 will fill in the contents of the procedure linkage table later, 2342 when we know the address of the .got section. */ 2343 if (h->type == STT_FUNC 2344 || h->needs_plt) 2345 { 2346 if (! info->executable 2347 && !h->def_dynamic 2348 && !h->ref_dynamic) 2349 { 2350 /* This case can occur if we saw a PLT reloc in an input 2351 file, but the symbol was never referred to by a dynamic 2352 object. In such a case, we don't actually need to build 2353 a procedure linkage table, and we can just do a REL32 2354 reloc instead. */ 2355 BFD_ASSERT (h->needs_plt); 2356 return TRUE; 2357 } 2358 2359 /* Make sure this symbol is output as a dynamic symbol. */ 2360 if (h->dynindx == -1) 2361 { 2362 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2363 return FALSE; 2364 } 2365 2366 /* We also need to make an entry in the .got.plt section, which 2367 will be placed in the .got section by the linker script. */ 2368 2369 s = bfd_get_linker_section (dynobj, ".got.plt"); 2370 BFD_ASSERT (s != NULL); 2371 s->size += 4; 2372 2373 /* We also need to make an entry in the .rela.plt section. */ 2374 2375 s = bfd_get_linker_section (dynobj, ".rela.plt"); 2376 BFD_ASSERT (s != NULL); 2377 s->size += sizeof (Elf32_External_Rela); 2378 2379 return TRUE; 2380 } 2381 2382 /* If this is a weak symbol, and there is a real definition, the 2383 processor independent code will have arranged for us to see the 2384 real definition first, and we can just use the same value. */ 2385 if (h->u.weakdef != NULL) 2386 { 2387 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 2388 || h->u.weakdef->root.type == bfd_link_hash_defweak); 2389 h->root.u.def.section = h->u.weakdef->root.u.def.section; 2390 h->root.u.def.value = h->u.weakdef->root.u.def.value; 2391 return TRUE; 2392 } 2393 2394 /* This is a reference to a symbol defined by a dynamic object which 2395 is not a function. */ 2396 2397 /* If we are creating a shared library, we must presume that the 2398 only references to the symbol are via the global offset table. 2399 For such cases we need not do anything here; the relocations will 2400 be handled correctly by relocate_section. */ 2401 if (info->executable) 2402 return TRUE; 2403 2404 /* If there are no references to this symbol that do not use the 2405 GOT, we don't need to generate a copy reloc. */ 2406 if (!h->non_got_ref) 2407 return TRUE; 2408 2409 /* We must allocate the symbol in our .dynbss section, which will 2410 become part of the .bss section of the executable. There will be 2411 an entry for this symbol in the .dynsym section. The dynamic 2412 object will contain position independent code, so all references 2413 from the dynamic object to this symbol will go through the global 2414 offset table. The dynamic linker will use the .dynsym entry to 2415 determine the address it must put in the global offset table, so 2416 both the dynamic object and the regular object will refer to the 2417 same memory location for the variable. */ 2418 2419 s = bfd_get_linker_section (dynobj, ".dynbss"); 2420 BFD_ASSERT (s != NULL); 2421 2422 /* We must generate a R_CR16_COPY reloc to tell the dynamic linker to 2423 copy the initial value out of the dynamic object and into the 2424 runtime process image. We need to remember the offset into the 2425 .rela.bss section we are going to use. */ 2426 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 2427 { 2428 asection * srel; 2429 2430 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 2431 BFD_ASSERT (srel != NULL); 2432 srel->size += sizeof (Elf32_External_Rela); 2433 h->needs_copy = 1; 2434 } 2435 2436 return _bfd_elf_adjust_dynamic_copy (h, s); 2437 } 2438 2439 /* Set the sizes of the dynamic sections. */ 2440 2441 static bfd_boolean 2442 _bfd_cr16_elf_size_dynamic_sections (bfd * output_bfd, 2443 struct bfd_link_info * info) 2444 { 2445 bfd * dynobj; 2446 asection * s; 2447 bfd_boolean plt; 2448 bfd_boolean relocs; 2449 bfd_boolean reltext; 2450 2451 dynobj = elf_hash_table (info)->dynobj; 2452 BFD_ASSERT (dynobj != NULL); 2453 2454 if (elf_hash_table (info)->dynamic_sections_created) 2455 { 2456 /* Set the contents of the .interp section to the interpreter. */ 2457 if (info->executable) 2458 { 2459 #if 0 2460 s = bfd_get_linker_section (dynobj, ".interp"); 2461 BFD_ASSERT (s != NULL); 2462 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2463 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2464 #endif 2465 } 2466 } 2467 else 2468 { 2469 /* We may have created entries in the .rela.got section. 2470 However, if we are not creating the dynamic sections, we will 2471 not actually use these entries. Reset the size of .rela.got, 2472 which will cause it to get stripped from the output file 2473 below. */ 2474 s = bfd_get_linker_section (dynobj, ".rela.got"); 2475 if (s != NULL) 2476 s->size = 0; 2477 } 2478 2479 /* The check_relocs and adjust_dynamic_symbol entry points have 2480 determined the sizes of the various dynamic sections. Allocate 2481 memory for them. */ 2482 plt = FALSE; 2483 relocs = FALSE; 2484 reltext = FALSE; 2485 for (s = dynobj->sections; s != NULL; s = s->next) 2486 { 2487 const char * name; 2488 2489 if ((s->flags & SEC_LINKER_CREATED) == 0) 2490 continue; 2491 2492 /* It's OK to base decisions on the section name, because none 2493 of the dynobj section names depend upon the input files. */ 2494 name = bfd_get_section_name (dynobj, s); 2495 2496 if (strcmp (name, ".plt") == 0) 2497 { 2498 /* Remember whether there is a PLT. */ 2499 plt = s->size != 0; 2500 } 2501 else if (CONST_STRNEQ (name, ".rela")) 2502 { 2503 if (s->size != 0) 2504 { 2505 asection * target; 2506 2507 /* Remember whether there are any reloc sections other 2508 than .rela.plt. */ 2509 if (strcmp (name, ".rela.plt") != 0) 2510 { 2511 const char * outname; 2512 2513 relocs = TRUE; 2514 2515 /* If this relocation section applies to a read only 2516 section, then we probably need a DT_TEXTREL 2517 entry. The entries in the .rela.plt section 2518 really apply to the .got section, which we 2519 created ourselves and so know is not readonly. */ 2520 outname = bfd_get_section_name (output_bfd, 2521 s->output_section); 2522 target = bfd_get_section_by_name (output_bfd, outname + 5); 2523 if (target != NULL 2524 && (target->flags & SEC_READONLY) != 0 2525 && (target->flags & SEC_ALLOC) != 0) 2526 reltext = TRUE; 2527 } 2528 2529 /* We use the reloc_count field as a counter if we need 2530 to copy relocs into the output file. */ 2531 s->reloc_count = 0; 2532 } 2533 } 2534 else if (! CONST_STRNEQ (name, ".got") 2535 && strcmp (name, ".dynbss") != 0) 2536 /* It's not one of our sections, so don't allocate space. */ 2537 continue; 2538 2539 if (s->size == 0) 2540 { 2541 /* If we don't need this section, strip it from the 2542 output file. This is mostly to handle .rela.bss and 2543 .rela.plt. We must create both sections in 2544 create_dynamic_sections, because they must be created 2545 before the linker maps input sections to output 2546 sections. The linker does that before 2547 adjust_dynamic_symbol is called, and it is that 2548 function which decides whether anything needs to go 2549 into these sections. */ 2550 s->flags |= SEC_EXCLUDE; 2551 continue; 2552 } 2553 2554 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2555 continue; 2556 2557 /* Allocate memory for the section contents. We use bfd_zalloc 2558 here in case unused entries are not reclaimed before the 2559 section's contents are written out. This should not happen, 2560 but this way if it does, we get a R_CR16_NONE reloc 2561 instead of garbage. */ 2562 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2563 if (s->contents == NULL) 2564 return FALSE; 2565 } 2566 2567 if (elf_hash_table (info)->dynamic_sections_created) 2568 { 2569 /* Add some entries to the .dynamic section. We fill in the 2570 values later, in _bfd_cr16_elf_finish_dynamic_sections, 2571 but we must add the entries now so that we get the correct 2572 size for the .dynamic section. The DT_DEBUG entry is filled 2573 in by the dynamic linker and used by the debugger. */ 2574 if (! info->executable) 2575 { 2576 if (!_bfd_elf_add_dynamic_entry (info, DT_DEBUG, 0)) 2577 return FALSE; 2578 } 2579 2580 if (plt) 2581 { 2582 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0) 2583 || !_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0) 2584 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_RELA) 2585 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0)) 2586 return FALSE; 2587 } 2588 2589 if (relocs) 2590 { 2591 if (!_bfd_elf_add_dynamic_entry (info, DT_RELA, 0) 2592 || !_bfd_elf_add_dynamic_entry (info, DT_RELASZ, 0) 2593 || !_bfd_elf_add_dynamic_entry (info, DT_RELAENT, 2594 sizeof (Elf32_External_Rela))) 2595 return FALSE; 2596 } 2597 2598 if (reltext) 2599 { 2600 if (!_bfd_elf_add_dynamic_entry (info, DT_TEXTREL, 0)) 2601 return FALSE; 2602 } 2603 } 2604 2605 return TRUE; 2606 } 2607 2608 /* Finish up dynamic symbol handling. We set the contents of various 2609 dynamic sections here. */ 2610 2611 static bfd_boolean 2612 _bfd_cr16_elf_finish_dynamic_symbol (bfd * output_bfd, 2613 struct bfd_link_info * info, 2614 struct elf_link_hash_entry * h, 2615 Elf_Internal_Sym * sym) 2616 { 2617 bfd * dynobj; 2618 2619 dynobj = elf_hash_table (info)->dynobj; 2620 2621 if (h->got.offset != (bfd_vma) -1) 2622 { 2623 asection * sgot; 2624 asection * srel; 2625 Elf_Internal_Rela rel; 2626 2627 /* This symbol has an entry in the global offset table. Set it up. */ 2628 2629 sgot = bfd_get_linker_section (dynobj, ".got"); 2630 srel = bfd_get_linker_section (dynobj, ".rela.got"); 2631 BFD_ASSERT (sgot != NULL && srel != NULL); 2632 2633 rel.r_offset = (sgot->output_section->vma 2634 + sgot->output_offset 2635 + (h->got.offset & ~1)); 2636 2637 /* If this is a -Bsymbolic link, and the symbol is defined 2638 locally, we just want to emit a RELATIVE reloc. Likewise if 2639 the symbol was forced to be local because of a version file. 2640 The entry in the global offset table will already have been 2641 initialized in the relocate_section function. */ 2642 if (info->executable 2643 && (info->symbolic || h->dynindx == -1) 2644 && h->def_regular) 2645 { 2646 rel.r_info = ELF32_R_INFO (0, R_CR16_GOT_REGREL20); 2647 rel.r_addend = (h->root.u.def.value 2648 + h->root.u.def.section->output_section->vma 2649 + h->root.u.def.section->output_offset); 2650 } 2651 else 2652 { 2653 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); 2654 rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20); 2655 rel.r_addend = 0; 2656 } 2657 2658 bfd_elf32_swap_reloca_out (output_bfd, &rel, 2659 (bfd_byte *) ((Elf32_External_Rela *) srel->contents 2660 + srel->reloc_count)); 2661 ++ srel->reloc_count; 2662 } 2663 2664 if (h->needs_copy) 2665 { 2666 asection * s; 2667 Elf_Internal_Rela rel; 2668 2669 /* This symbol needs a copy reloc. Set it up. */ 2670 BFD_ASSERT (h->dynindx != -1 2671 && (h->root.type == bfd_link_hash_defined 2672 || h->root.type == bfd_link_hash_defweak)); 2673 2674 s = bfd_get_linker_section (dynobj, ".rela.bss"); 2675 BFD_ASSERT (s != NULL); 2676 2677 rel.r_offset = (h->root.u.def.value 2678 + h->root.u.def.section->output_section->vma 2679 + h->root.u.def.section->output_offset); 2680 rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20); 2681 rel.r_addend = 0; 2682 bfd_elf32_swap_reloca_out (output_bfd, &rel, 2683 (bfd_byte *) ((Elf32_External_Rela *) s->contents 2684 + s->reloc_count)); 2685 ++ s->reloc_count; 2686 } 2687 2688 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 2689 if (h == elf_hash_table (info)->hdynamic 2690 || h == elf_hash_table (info)->hgot) 2691 sym->st_shndx = SHN_ABS; 2692 2693 return TRUE; 2694 } 2695 2696 /* Finish up the dynamic sections. */ 2697 2698 static bfd_boolean 2699 _bfd_cr16_elf_finish_dynamic_sections (bfd * output_bfd, 2700 struct bfd_link_info * info) 2701 { 2702 bfd * dynobj; 2703 asection * sgot; 2704 asection * sdyn; 2705 2706 dynobj = elf_hash_table (info)->dynobj; 2707 2708 sgot = bfd_get_linker_section (dynobj, ".got.plt"); 2709 BFD_ASSERT (sgot != NULL); 2710 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 2711 2712 if (elf_hash_table (info)->dynamic_sections_created) 2713 { 2714 Elf32_External_Dyn * dyncon; 2715 Elf32_External_Dyn * dynconend; 2716 2717 BFD_ASSERT (sdyn != NULL); 2718 2719 dyncon = (Elf32_External_Dyn *) sdyn->contents; 2720 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 2721 2722 for (; dyncon < dynconend; dyncon++) 2723 { 2724 Elf_Internal_Dyn dyn; 2725 const char * name; 2726 asection * s; 2727 2728 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 2729 2730 switch (dyn.d_tag) 2731 { 2732 default: 2733 break; 2734 2735 case DT_PLTGOT: 2736 name = ".got"; 2737 goto get_vma; 2738 2739 case DT_JMPREL: 2740 name = ".rela.plt"; 2741 get_vma: 2742 s = bfd_get_section_by_name (output_bfd, name); 2743 BFD_ASSERT (s != NULL); 2744 dyn.d_un.d_ptr = s->vma; 2745 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2746 break; 2747 2748 case DT_PLTRELSZ: 2749 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2750 BFD_ASSERT (s != NULL); 2751 dyn.d_un.d_val = s->size; 2752 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2753 break; 2754 2755 case DT_RELASZ: 2756 /* My reading of the SVR4 ABI indicates that the 2757 procedure linkage table relocs (DT_JMPREL) should be 2758 included in the overall relocs (DT_RELA). This is 2759 what Solaris does. However, UnixWare can not handle 2760 that case. Therefore, we override the DT_RELASZ entry 2761 here to make it not include the JMPREL relocs. Since 2762 the linker script arranges for .rela.plt to follow all 2763 other relocation sections, we don't have to worry 2764 about changing the DT_RELA entry. */ 2765 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2766 if (s != NULL) 2767 dyn.d_un.d_val -= s->size; 2768 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2769 break; 2770 } 2771 } 2772 2773 } 2774 2775 /* Fill in the first three entries in the global offset table. */ 2776 if (sgot->size > 0) 2777 { 2778 if (sdyn == NULL) 2779 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2780 else 2781 bfd_put_32 (output_bfd, 2782 sdyn->output_section->vma + sdyn->output_offset, 2783 sgot->contents); 2784 } 2785 2786 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2787 2788 return TRUE; 2789 } 2790 2791 /* Given a .data.rel section and a .emreloc in-memory section, store 2792 relocation information into the .emreloc section which can be 2793 used at runtime to relocate the section. This is called by the 2794 linker when the --embedded-relocs switch is used. This is called 2795 after the add_symbols entry point has been called for all the 2796 objects, and before the final_link entry point is called. */ 2797 2798 bfd_boolean 2799 bfd_cr16_elf32_create_embedded_relocs (bfd *abfd, 2800 struct bfd_link_info *info, 2801 asection *datasec, 2802 asection *relsec, 2803 char **errmsg) 2804 { 2805 Elf_Internal_Shdr *symtab_hdr; 2806 Elf_Internal_Sym *isymbuf = NULL; 2807 Elf_Internal_Rela *internal_relocs = NULL; 2808 Elf_Internal_Rela *irel, *irelend; 2809 bfd_byte *p; 2810 bfd_size_type amt; 2811 2812 BFD_ASSERT (! info->relocatable); 2813 2814 *errmsg = NULL; 2815 2816 if (datasec->reloc_count == 0) 2817 return TRUE; 2818 2819 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2820 2821 /* Get a copy of the native relocations. */ 2822 internal_relocs = (_bfd_elf_link_read_relocs 2823 (abfd, datasec, NULL, NULL, info->keep_memory)); 2824 if (internal_relocs == NULL) 2825 goto error_return; 2826 2827 amt = (bfd_size_type) datasec->reloc_count * 8; 2828 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 2829 if (relsec->contents == NULL) 2830 goto error_return; 2831 2832 p = relsec->contents; 2833 2834 irelend = internal_relocs + datasec->reloc_count; 2835 for (irel = internal_relocs; irel < irelend; irel++, p += 8) 2836 { 2837 asection *targetsec; 2838 2839 /* We are going to write a four byte longword into the runtime 2840 reloc section. The longword will be the address in the data 2841 section which must be relocated. It is followed by the name 2842 of the target section NUL-padded or truncated to 8 2843 characters. */ 2844 2845 /* We can only relocate absolute longword relocs at run time. */ 2846 if (!((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a) 2847 || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32))) 2848 { 2849 *errmsg = _("unsupported reloc type"); 2850 bfd_set_error (bfd_error_bad_value); 2851 goto error_return; 2852 } 2853 2854 /* Get the target section referred to by the reloc. */ 2855 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2856 { 2857 /* A local symbol. */ 2858 Elf_Internal_Sym *isym; 2859 2860 /* Read this BFD's local symbols if we haven't done so already. */ 2861 if (isymbuf == NULL) 2862 { 2863 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2864 if (isymbuf == NULL) 2865 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2866 symtab_hdr->sh_info, 0, 2867 NULL, NULL, NULL); 2868 if (isymbuf == NULL) 2869 goto error_return; 2870 } 2871 2872 isym = isymbuf + ELF32_R_SYM (irel->r_info); 2873 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2874 } 2875 else 2876 { 2877 unsigned long indx; 2878 struct elf_link_hash_entry *h; 2879 2880 /* An external symbol. */ 2881 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2882 h = elf_sym_hashes (abfd)[indx]; 2883 BFD_ASSERT (h != NULL); 2884 if (h->root.type == bfd_link_hash_defined 2885 || h->root.type == bfd_link_hash_defweak) 2886 targetsec = h->root.u.def.section; 2887 else 2888 targetsec = NULL; 2889 } 2890 2891 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 2892 memset (p + 4, 0, 4); 2893 if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a) 2894 && (targetsec != NULL) ) 2895 strncpy ((char *) p + 4, targetsec->output_section->name, 4); 2896 } 2897 2898 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 2899 free (isymbuf); 2900 if (internal_relocs != NULL 2901 && elf_section_data (datasec)->relocs != internal_relocs) 2902 free (internal_relocs); 2903 return TRUE; 2904 2905 error_return: 2906 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 2907 free (isymbuf); 2908 if (internal_relocs != NULL 2909 && elf_section_data (datasec)->relocs != internal_relocs) 2910 free (internal_relocs); 2911 return FALSE; 2912 } 2913 2914 2915 /* Classify relocation types, such that combreloc can sort them 2916 properly. */ 2917 2918 static enum elf_reloc_type_class 2919 _bfd_cr16_elf_reloc_type_class (const Elf_Internal_Rela *rela) 2920 { 2921 switch ((int) ELF32_R_TYPE (rela->r_info)) 2922 { 2923 case R_CR16_GOT_REGREL20: 2924 case R_CR16_GOTC_REGREL20: 2925 return reloc_class_relative; 2926 default: 2927 return reloc_class_normal; 2928 } 2929 } 2930 2931 /* Definitions for setting CR16 target vector. */ 2932 #define TARGET_LITTLE_SYM bfd_elf32_cr16_vec 2933 #define TARGET_LITTLE_NAME "elf32-cr16" 2934 #define ELF_ARCH bfd_arch_cr16 2935 #define ELF_MACHINE_CODE EM_CR16 2936 #define ELF_MACHINE_ALT1 EM_CR16_OLD 2937 #define ELF_MAXPAGESIZE 0x1 2938 #define elf_symbol_leading_char '_' 2939 2940 #define bfd_elf32_bfd_reloc_type_lookup elf_cr16_reloc_type_lookup 2941 #define bfd_elf32_bfd_reloc_name_lookup elf_cr16_reloc_name_lookup 2942 #define elf_info_to_howto elf_cr16_info_to_howto 2943 #define elf_info_to_howto_rel 0 2944 #define elf_backend_relocate_section elf32_cr16_relocate_section 2945 #define bfd_elf32_bfd_relax_section elf32_cr16_relax_section 2946 #define bfd_elf32_bfd_get_relocated_section_contents \ 2947 elf32_cr16_get_relocated_section_contents 2948 #define elf_backend_gc_mark_hook elf32_cr16_gc_mark_hook 2949 #define elf_backend_gc_sweep_hook elf32_cr16_gc_sweep_hook 2950 #define elf_backend_can_gc_sections 1 2951 #define elf_backend_rela_normal 1 2952 #define elf_backend_check_relocs cr16_elf_check_relocs 2953 /* So we can set bits in e_flags. */ 2954 #define elf_backend_final_write_processing \ 2955 _bfd_cr16_elf_final_write_processing 2956 #define elf_backend_object_p _bfd_cr16_elf_object_p 2957 2958 #define bfd_elf32_bfd_merge_private_bfd_data \ 2959 _bfd_cr16_elf_merge_private_bfd_data 2960 2961 2962 #define bfd_elf32_bfd_link_hash_table_create \ 2963 elf32_cr16_link_hash_table_create 2964 2965 #define elf_backend_create_dynamic_sections \ 2966 _bfd_cr16_elf_create_dynamic_sections 2967 #define elf_backend_adjust_dynamic_symbol \ 2968 _bfd_cr16_elf_adjust_dynamic_symbol 2969 #define elf_backend_size_dynamic_sections \ 2970 _bfd_cr16_elf_size_dynamic_sections 2971 #define elf_backend_omit_section_dynsym \ 2972 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 2973 #define elf_backend_finish_dynamic_symbol \ 2974 _bfd_cr16_elf_finish_dynamic_symbol 2975 #define elf_backend_finish_dynamic_sections \ 2976 _bfd_cr16_elf_finish_dynamic_sections 2977 2978 #define elf_backend_reloc_type_class _bfd_cr16_elf_reloc_type_class 2979 2980 2981 #define elf_backend_want_got_plt 1 2982 #define elf_backend_plt_readonly 1 2983 #define elf_backend_want_plt_sym 0 2984 #define elf_backend_got_header_size 12 2985 2986 #include "elf32-target.h" 2987