elf32-cr16.c revision 1.1
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_malloc (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 /* Free an cr16 ELF linker hash table. */ 1680 1681 static void 1682 elf32_cr16_link_hash_table_free (struct bfd_link_hash_table *hash) 1683 { 1684 struct elf_link_hash_table *ret 1685 = (struct elf_link_hash_table *) hash; 1686 1687 _bfd_generic_link_hash_table_free 1688 ((struct bfd_link_hash_table *) ret); 1689 } 1690 1691 static unsigned long 1692 elf_cr16_mach (flagword flags) 1693 { 1694 switch (flags) 1695 { 1696 case EM_CR16: 1697 default: 1698 return bfd_mach_cr16; 1699 } 1700 } 1701 1702 /* The final processing done just before writing out a CR16 ELF object 1703 file. This gets the CR16 architecture right based on the machine 1704 number. */ 1705 1706 static void 1707 _bfd_cr16_elf_final_write_processing (bfd *abfd, 1708 bfd_boolean linker ATTRIBUTE_UNUSED) 1709 { 1710 unsigned long val; 1711 switch (bfd_get_mach (abfd)) 1712 { 1713 default: 1714 case bfd_mach_cr16: 1715 val = EM_CR16; 1716 break; 1717 } 1718 1719 1720 elf_elfheader (abfd)->e_flags |= val; 1721 } 1722 1723 1724 static bfd_boolean 1725 _bfd_cr16_elf_object_p (bfd *abfd) 1726 { 1727 bfd_default_set_arch_mach (abfd, bfd_arch_cr16, 1728 elf_cr16_mach (elf_elfheader (abfd)->e_flags)); 1729 return TRUE; 1730 } 1731 1732 /* Merge backend specific data from an object file to the output 1733 object file when linking. */ 1734 1735 static bfd_boolean 1736 _bfd_cr16_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 1737 { 1738 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1739 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1740 return TRUE; 1741 1742 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) 1743 && bfd_get_mach (obfd) < bfd_get_mach (ibfd)) 1744 { 1745 if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), 1746 bfd_get_mach (ibfd))) 1747 return FALSE; 1748 } 1749 1750 return TRUE; 1751 } 1752 1753 1754 /* This function handles relaxing for the CR16. 1755 1756 There's quite a few relaxing opportunites available on the CR16: 1757 1758 * bcond:24 -> bcond:16 1 byte 1759 * bcond:16 -> bcond:8 1 byte 1760 * arithmetic imm32 -> arithmetic imm20 12 bits 1761 * arithmetic imm20/imm16 -> arithmetic imm4 12/16 bits 1762 1763 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 1764 1765 static bfd_boolean 1766 elf32_cr16_relax_section (bfd *abfd, asection *sec, 1767 struct bfd_link_info *link_info, bfd_boolean *again) 1768 { 1769 Elf_Internal_Shdr *symtab_hdr; 1770 Elf_Internal_Rela *internal_relocs; 1771 Elf_Internal_Rela *irel, *irelend; 1772 bfd_byte *contents = NULL; 1773 Elf_Internal_Sym *isymbuf = NULL; 1774 1775 /* Assume nothing changes. */ 1776 *again = FALSE; 1777 1778 /* We don't have to do anything for a relocatable link, if 1779 this section does not have relocs, or if this is not a 1780 code section. */ 1781 if (link_info->relocatable 1782 || (sec->flags & SEC_RELOC) == 0 1783 || sec->reloc_count == 0 1784 || (sec->flags & SEC_CODE) == 0) 1785 return TRUE; 1786 1787 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1788 1789 /* Get a copy of the native relocations. */ 1790 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, 1791 link_info->keep_memory); 1792 if (internal_relocs == NULL) 1793 goto error_return; 1794 1795 /* Walk through them looking for relaxing opportunities. */ 1796 irelend = internal_relocs + sec->reloc_count; 1797 for (irel = internal_relocs; irel < irelend; irel++) 1798 { 1799 bfd_vma symval; 1800 1801 /* If this isn't something that can be relaxed, then ignore 1802 this reloc. */ 1803 if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP16 1804 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP24 1805 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM32 1806 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM20 1807 && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM16) 1808 continue; 1809 1810 /* Get the section contents if we haven't done so already. */ 1811 if (contents == NULL) 1812 { 1813 /* Get cached copy if it exists. */ 1814 if (elf_section_data (sec)->this_hdr.contents != NULL) 1815 contents = elf_section_data (sec)->this_hdr.contents; 1816 /* Go get them off disk. */ 1817 else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1818 goto error_return; 1819 } 1820 1821 /* Read this BFD's local symbols if we haven't done so already. */ 1822 if (isymbuf == NULL && symtab_hdr->sh_info != 0) 1823 { 1824 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1825 if (isymbuf == NULL) 1826 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 1827 symtab_hdr->sh_info, 0, 1828 NULL, NULL, NULL); 1829 if (isymbuf == NULL) 1830 goto error_return; 1831 } 1832 1833 /* Get the value of the symbol referred to by the reloc. */ 1834 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 1835 { 1836 /* A local symbol. */ 1837 Elf_Internal_Sym *isym; 1838 asection *sym_sec; 1839 1840 isym = isymbuf + ELF32_R_SYM (irel->r_info); 1841 if (isym->st_shndx == SHN_UNDEF) 1842 sym_sec = bfd_und_section_ptr; 1843 else if (isym->st_shndx == SHN_ABS) 1844 sym_sec = bfd_abs_section_ptr; 1845 else if (isym->st_shndx == SHN_COMMON) 1846 sym_sec = bfd_com_section_ptr; 1847 else 1848 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 1849 symval = (isym->st_value 1850 + sym_sec->output_section->vma 1851 + sym_sec->output_offset); 1852 } 1853 else 1854 { 1855 unsigned long indx; 1856 struct elf_link_hash_entry *h; 1857 1858 /* An external symbol. */ 1859 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 1860 h = elf_sym_hashes (abfd)[indx]; 1861 BFD_ASSERT (h != NULL); 1862 1863 if (h->root.type != bfd_link_hash_defined 1864 && h->root.type != bfd_link_hash_defweak) 1865 /* This appears to be a reference to an undefined 1866 symbol. Just ignore it--it will be caught by the 1867 regular reloc processing. */ 1868 continue; 1869 1870 symval = (h->root.u.def.value 1871 + h->root.u.def.section->output_section->vma 1872 + h->root.u.def.section->output_offset); 1873 } 1874 1875 /* For simplicity of coding, we are going to modify the section 1876 contents, the section relocs, and the BFD symbol table. We 1877 must tell the rest of the code not to free up this 1878 information. It would be possible to instead create a table 1879 of changes which have to be made, as is done in coff-mips.c; 1880 that would be more work, but would require less memory when 1881 the linker is run. */ 1882 1883 /* Try to turn a 24 branch/call into a 16bit relative 1884 branch/call. */ 1885 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP24) 1886 { 1887 bfd_vma value = symval; 1888 1889 /* Deal with pc-relative gunk. */ 1890 value -= (sec->output_section->vma + sec->output_offset); 1891 value -= irel->r_offset; 1892 value += irel->r_addend; 1893 1894 /* See if the value will fit in 16 bits, note the high value is 1895 0xfffe + 2 as the target will be two bytes closer if we are 1896 able to relax. */ 1897 if ((long) value < 0x10000 && (long) value > -0x10002) 1898 { 1899 unsigned int code; 1900 1901 /* Get the opcode. */ 1902 code = (unsigned int) bfd_get_32 (abfd, contents + irel->r_offset); 1903 1904 /* Verify it's a 'bcond' and fix the opcode. */ 1905 if ((code & 0xffff) == 0x0010) 1906 bfd_put_16 (abfd, 0x1800 | ((0xf & (code >> 20)) << 4), contents + irel->r_offset); 1907 else 1908 continue; 1909 1910 /* Note that we've changed the relocs, section contents, etc. */ 1911 elf_section_data (sec)->relocs = internal_relocs; 1912 elf_section_data (sec)->this_hdr.contents = contents; 1913 symtab_hdr->contents = (unsigned char *) isymbuf; 1914 1915 /* Fix the relocation's type. */ 1916 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1917 R_CR16_DISP16); 1918 1919 /* Delete two bytes of data. */ 1920 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1921 irel->r_offset + 2, 2)) 1922 goto error_return; 1923 1924 /* That will change things, so, we should relax again. 1925 Note that this is not required, and it may be slow. */ 1926 *again = TRUE; 1927 } 1928 } 1929 1930 /* Try to turn a 16bit pc-relative branch into an 1931 8bit pc-relative branch. */ 1932 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP16) 1933 { 1934 bfd_vma value = symval; 1935 1936 /* Deal with pc-relative gunk. */ 1937 value -= (sec->output_section->vma + sec->output_offset); 1938 value -= irel->r_offset; 1939 value += irel->r_addend; 1940 1941 /* See if the value will fit in 8 bits, note the high value is 1942 0xfc + 2 as the target will be two bytes closer if we are 1943 able to relax. */ 1944 /*if ((long) value < 0x1fa && (long) value > -0x100) REVISIT:range */ 1945 if ((long) value < 0xfa && (long) value > -0x100) 1946 { 1947 unsigned short code; 1948 1949 /* Get the opcode. */ 1950 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 1951 1952 /* Verify it's a 'bcond' and fix the opcode. */ 1953 if ((code & 0xff0f) == 0x1800) 1954 bfd_put_16 (abfd, (code & 0xf0f0), contents + irel->r_offset); 1955 else 1956 continue; 1957 1958 /* Note that we've changed the relocs, section contents, etc. */ 1959 elf_section_data (sec)->relocs = internal_relocs; 1960 elf_section_data (sec)->this_hdr.contents = contents; 1961 symtab_hdr->contents = (unsigned char *) isymbuf; 1962 1963 /* Fix the relocation's type. */ 1964 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1965 R_CR16_DISP8); 1966 1967 /* Delete two bytes of data. */ 1968 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 1969 irel->r_offset + 2, 2)) 1970 goto error_return; 1971 1972 /* That will change things, so, we should relax again. 1973 Note that this is not required, and it may be slow. */ 1974 *again = TRUE; 1975 } 1976 } 1977 1978 /* Try to turn a 32-bit IMM address into a 20/16-bit IMM address */ 1979 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM32) 1980 { 1981 bfd_vma value = symval; 1982 unsigned short is_add_mov = 0; 1983 bfd_vma value1 = 0; 1984 1985 /* Get the existing value from the mcode */ 1986 value1 = ((bfd_get_32 (abfd, contents + irel->r_offset + 2) >> 16) 1987 |(((bfd_get_32 (abfd, contents + irel->r_offset + 2) & 0xffff) << 16))); 1988 1989 /* See if the value will fit in 20 bits. */ 1990 if ((long) (value + value1) < 0xfffff && (long) (value + value1) > 0) 1991 { 1992 unsigned short code; 1993 1994 /* Get the opcode. */ 1995 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 1996 1997 /* Verify it's a 'arithmetic ADDD or MOVD instruction'. 1998 For ADDD and MOVD only, convert to IMM32 -> IMM20. */ 1999 2000 if (((code & 0xfff0) == 0x0070) || ((code & 0xfff0) == 0x0020)) 2001 is_add_mov = 1; 2002 2003 if (is_add_mov) 2004 { 2005 /* Note that we've changed the relocs, section contents, 2006 etc. */ 2007 elf_section_data (sec)->relocs = internal_relocs; 2008 elf_section_data (sec)->this_hdr.contents = contents; 2009 symtab_hdr->contents = (unsigned char *) isymbuf; 2010 2011 /* Fix the opcode. */ 2012 if ((code & 0xfff0) == 0x0070) /* For movd. */ 2013 bfd_put_8 (abfd, 0x05, contents + irel->r_offset + 1); 2014 else /* code == 0x0020 for addd. */ 2015 bfd_put_8 (abfd, 0x04, contents + irel->r_offset + 1); 2016 2017 bfd_put_8 (abfd, (code & 0xf) << 4, contents + irel->r_offset); 2018 2019 /* If existing value is nagavive adjust approriately 2020 place the 16-20bits (ie 4 bit) in new opcode, 2021 as the 0xffffxxxx, the higher 2 byte values removed. */ 2022 if (value1 & 0x80000000) 2023 bfd_put_8 (abfd, (0x0f | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2024 else 2025 bfd_put_8 (abfd, (((value1 >> 16)&0xf) | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2026 2027 /* Fix the relocation's type. */ 2028 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2029 R_CR16_IMM20); 2030 2031 /* Delete two bytes of data. */ 2032 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2033 irel->r_offset + 2, 2)) 2034 goto error_return; 2035 2036 /* That will change things, so, we should relax again. 2037 Note that this is not required, and it may be slow. */ 2038 *again = TRUE; 2039 } 2040 } 2041 2042 /* See if the value will fit in 16 bits. */ 2043 if ((!is_add_mov) 2044 && ((long)(value + value1) < 0x7fff && (long)(value + value1) > 0)) 2045 { 2046 unsigned short code; 2047 2048 /* Get the opcode. */ 2049 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 2050 2051 /* Note that we've changed the relocs, section contents, etc. */ 2052 elf_section_data (sec)->relocs = internal_relocs; 2053 elf_section_data (sec)->this_hdr.contents = contents; 2054 symtab_hdr->contents = (unsigned char *) isymbuf; 2055 2056 /* Fix the opcode. */ 2057 if ((code & 0xf0) == 0x70) /* For movd. */ 2058 bfd_put_8 (abfd, 0x54, contents + irel->r_offset + 1); 2059 else if ((code & 0xf0) == 0x20) /* For addd. */ 2060 bfd_put_8 (abfd, 0x60, contents + irel->r_offset + 1); 2061 else if ((code & 0xf0) == 0x90) /* For cmpd. */ 2062 bfd_put_8 (abfd, 0x56, contents + irel->r_offset + 1); 2063 else 2064 continue; 2065 2066 bfd_put_8 (abfd, 0xb0 | (code & 0xf), contents + irel->r_offset); 2067 2068 /* If existing value is nagavive adjust approriately 2069 place the 12-16bits (ie 4 bit) in new opcode, 2070 as the 0xfffffxxx, the higher 2 byte values removed. */ 2071 if (value1 & 0x80000000) 2072 bfd_put_8 (abfd, (0x0f | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset); 2073 else 2074 bfd_put_16 (abfd, value1, contents + irel->r_offset + 2); 2075 2076 2077 /* Fix the relocation's type. */ 2078 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2079 R_CR16_IMM16); 2080 2081 /* Delete two bytes of data. */ 2082 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2083 irel->r_offset + 2, 2)) 2084 goto error_return; 2085 2086 /* That will change things, so, we should relax again. 2087 Note that this is not required, and it may be slow. */ 2088 *again = TRUE; 2089 } 2090 } 2091 2092 #if 0 2093 /* Try to turn a 16bit immediate address into a 4bit 2094 immediate address. */ 2095 if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20) 2096 || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM16)) 2097 { 2098 bfd_vma value = symval; 2099 bfd_vma value1 = 0; 2100 2101 /* Get the existing value from the mcode */ 2102 value1 = ((bfd_get_16 (abfd, contents + irel->r_offset + 2) & 0xffff)); 2103 2104 if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20) 2105 { 2106 value1 |= ((bfd_get_16 (abfd, contents + irel->r_offset + 1) & 0xf000) << 0x4); 2107 } 2108 2109 /* See if the value will fit in 4 bits. */ 2110 if ((((long) (value + value1)) < 0xf) 2111 && (((long) (value + value1)) > 0)) 2112 { 2113 unsigned short code; 2114 2115 /* Get the opcode. */ 2116 code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); 2117 2118 /* Note that we've changed the relocs, section contents, etc. */ 2119 elf_section_data (sec)->relocs = internal_relocs; 2120 elf_section_data (sec)->this_hdr.contents = contents; 2121 symtab_hdr->contents = (unsigned char *) isymbuf; 2122 2123 /* Fix the opcode. */ 2124 if (((code & 0x0f00) == 0x0400) || ((code & 0x0f00) == 0x0500)) 2125 { 2126 if ((code & 0x0f00) == 0x0400) /* For movd imm20. */ 2127 bfd_put_8 (abfd, 0x60, contents + irel->r_offset); 2128 else /* For addd imm20. */ 2129 bfd_put_8 (abfd, 0x54, contents + irel->r_offset); 2130 bfd_put_8 (abfd, (code & 0xf0) >> 4, contents + irel->r_offset + 1); 2131 } 2132 else 2133 { 2134 if ((code & 0xfff0) == 0x56b0) /* For cmpd imm16. */ 2135 bfd_put_8 (abfd, 0x56, contents + irel->r_offset); 2136 else if ((code & 0xfff0) == 0x54b0) /* For movd imm16. */ 2137 bfd_put_8 (abfd, 0x54, contents + irel->r_offset); 2138 else if ((code & 0xfff0) == 0x58b0) /* For movb imm16. */ 2139 bfd_put_8 (abfd, 0x58, contents + irel->r_offset); 2140 else if ((code & 0xfff0) == 0x5Ab0) /* For movw imm16. */ 2141 bfd_put_8 (abfd, 0x5A, contents + irel->r_offset); 2142 else if ((code & 0xfff0) == 0x60b0) /* For addd imm16. */ 2143 bfd_put_8 (abfd, 0x60, contents + irel->r_offset); 2144 else if ((code & 0xfff0) == 0x30b0) /* For addb imm16. */ 2145 bfd_put_8 (abfd, 0x30, contents + irel->r_offset); 2146 else if ((code & 0xfff0) == 0x2Cb0) /* For addub imm16. */ 2147 bfd_put_8 (abfd, 0x2C, contents + irel->r_offset); 2148 else if ((code & 0xfff0) == 0x32b0) /* For adduw imm16. */ 2149 bfd_put_8 (abfd, 0x32, contents + irel->r_offset); 2150 else if ((code & 0xfff0) == 0x38b0) /* For subb imm16. */ 2151 bfd_put_8 (abfd, 0x38, contents + irel->r_offset); 2152 else if ((code & 0xfff0) == 0x3Cb0) /* For subcb imm16. */ 2153 bfd_put_8 (abfd, 0x3C, contents + irel->r_offset); 2154 else if ((code & 0xfff0) == 0x3Fb0) /* For subcw imm16. */ 2155 bfd_put_8 (abfd, 0x3F, contents + irel->r_offset); 2156 else if ((code & 0xfff0) == 0x3Ab0) /* For subw imm16. */ 2157 bfd_put_8 (abfd, 0x3A, contents + irel->r_offset); 2158 else if ((code & 0xfff0) == 0x50b0) /* For cmpb imm16. */ 2159 bfd_put_8 (abfd, 0x50, contents + irel->r_offset); 2160 else if ((code & 0xfff0) == 0x52b0) /* For cmpw imm16. */ 2161 bfd_put_8 (abfd, 0x52, contents + irel->r_offset); 2162 else 2163 continue; 2164 2165 bfd_put_8 (abfd, (code & 0xf), contents + irel->r_offset + 1); 2166 } 2167 2168 /* Fix the relocation's type. */ 2169 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 2170 R_CR16_IMM4); 2171 2172 /* Delete two bytes of data. */ 2173 if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec, 2174 irel->r_offset + 2, 2)) 2175 goto error_return; 2176 2177 /* That will change things, so, we should relax again. 2178 Note that this is not required, and it may be slow. */ 2179 *again = TRUE; 2180 } 2181 } 2182 #endif 2183 } 2184 2185 if (isymbuf != NULL 2186 && symtab_hdr->contents != (unsigned char *) isymbuf) 2187 { 2188 if (! link_info->keep_memory) 2189 free (isymbuf); 2190 else 2191 /* Cache the symbols for elf_link_input_bfd. */ 2192 symtab_hdr->contents = (unsigned char *) isymbuf; 2193 } 2194 2195 if (contents != NULL 2196 && elf_section_data (sec)->this_hdr.contents != contents) 2197 { 2198 if (! link_info->keep_memory) 2199 free (contents); 2200 else 2201 /* Cache the section contents for elf_link_input_bfd. */ 2202 elf_section_data (sec)->this_hdr.contents = contents; 2203 2204 } 2205 2206 if (internal_relocs != NULL 2207 && elf_section_data (sec)->relocs != internal_relocs) 2208 free (internal_relocs); 2209 2210 return TRUE; 2211 2212 error_return: 2213 if (isymbuf != NULL 2214 && symtab_hdr->contents != (unsigned char *) isymbuf) 2215 free (isymbuf); 2216 if (contents != NULL 2217 && elf_section_data (sec)->this_hdr.contents != contents) 2218 free (contents); 2219 if (internal_relocs != NULL 2220 && elf_section_data (sec)->relocs != internal_relocs) 2221 free (internal_relocs); 2222 2223 return FALSE; 2224 } 2225 2226 static asection * 2227 elf32_cr16_gc_mark_hook (asection *sec, 2228 struct bfd_link_info *info, 2229 Elf_Internal_Rela *rel, 2230 struct elf_link_hash_entry *h, 2231 Elf_Internal_Sym *sym) 2232 { 2233 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2234 } 2235 2236 /* Update the got entry reference counts for the section being removed. */ 2237 2238 static bfd_boolean 2239 elf32_cr16_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, 2240 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2241 asection *sec ATTRIBUTE_UNUSED, 2242 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 2243 { 2244 /* We don't support garbage collection of GOT and PLT relocs yet. */ 2245 return TRUE; 2246 } 2247 2248 /* Create dynamic sections when linking against a dynamic object. */ 2249 2250 static bfd_boolean 2251 _bfd_cr16_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 2252 { 2253 flagword flags; 2254 asection * s; 2255 const struct elf_backend_data * bed = get_elf_backend_data (abfd); 2256 int ptralign = 0; 2257 2258 switch (bed->s->arch_size) 2259 { 2260 case 16: 2261 ptralign = 1; 2262 break; 2263 2264 case 32: 2265 ptralign = 2; 2266 break; 2267 2268 default: 2269 bfd_set_error (bfd_error_bad_value); 2270 return FALSE; 2271 } 2272 2273 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and 2274 .rel[a].bss sections. */ 2275 2276 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 2277 | SEC_LINKER_CREATED); 2278 2279 s = bfd_make_section_anyway_with_flags (abfd, 2280 (bed->default_use_rela_p 2281 ? ".rela.plt" : ".rel.plt"), 2282 flags | SEC_READONLY); 2283 if (s == NULL 2284 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2285 return FALSE; 2286 2287 if (! _bfd_cr16_elf_create_got_section (abfd, info)) 2288 return FALSE; 2289 2290 if (bed->want_dynbss) 2291 { 2292 /* The .dynbss section is a place to put symbols which are defined 2293 by dynamic objects, are referenced by regular objects, and are 2294 not functions. We must allocate space for them in the process 2295 image and use a R_*_COPY reloc to tell the dynamic linker to 2296 initialize them at run time. The linker script puts the .dynbss 2297 section into the .bss section of the final image. */ 2298 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss", 2299 SEC_ALLOC | SEC_LINKER_CREATED); 2300 if (s == NULL) 2301 return FALSE; 2302 2303 /* The .rel[a].bss section holds copy relocs. This section is not 2304 normally needed. We need to create it here, though, so that the 2305 linker will map it to an output section. We can't just create it 2306 only if we need it, because we will not know whether we need it 2307 until we have seen all the input files, and the first time the 2308 main linker code calls BFD after examining all the input files 2309 (size_dynamic_sections) the input sections have already been 2310 mapped to the output sections. If the section turns out not to 2311 be needed, we can discard it later. We will never need this 2312 section when generating a shared object, since they do not use 2313 copy relocs. */ 2314 if (! info->executable) 2315 { 2316 s = bfd_make_section_anyway_with_flags (abfd, 2317 (bed->default_use_rela_p 2318 ? ".rela.bss" : ".rel.bss"), 2319 flags | SEC_READONLY); 2320 if (s == NULL 2321 || ! bfd_set_section_alignment (abfd, s, ptralign)) 2322 return FALSE; 2323 } 2324 } 2325 2326 return TRUE; 2327 } 2328 2329 /* Adjust a symbol defined by a dynamic object and referenced by a 2331 regular object. The current definition is in some section of the 2332 dynamic object, but we're not including those sections. We have to 2333 change the definition to something the rest of the link can 2334 understand. */ 2335 2336 static bfd_boolean 2337 _bfd_cr16_elf_adjust_dynamic_symbol (struct bfd_link_info * info, 2338 struct elf_link_hash_entry * h) 2339 { 2340 bfd * dynobj; 2341 asection * s; 2342 2343 dynobj = elf_hash_table (info)->dynobj; 2344 2345 /* Make sure we know what is going on here. */ 2346 BFD_ASSERT (dynobj != NULL 2347 && (h->needs_plt 2348 || h->u.weakdef != NULL 2349 || (h->def_dynamic 2350 && h->ref_regular 2351 && !h->def_regular))); 2352 2353 /* If this is a function, put it in the procedure linkage table. We 2354 will fill in the contents of the procedure linkage table later, 2355 when we know the address of the .got section. */ 2356 if (h->type == STT_FUNC 2357 || h->needs_plt) 2358 { 2359 if (! info->executable 2360 && !h->def_dynamic 2361 && !h->ref_dynamic) 2362 { 2363 /* This case can occur if we saw a PLT reloc in an input 2364 file, but the symbol was never referred to by a dynamic 2365 object. In such a case, we don't actually need to build 2366 a procedure linkage table, and we can just do a REL32 2367 reloc instead. */ 2368 BFD_ASSERT (h->needs_plt); 2369 return TRUE; 2370 } 2371 2372 /* Make sure this symbol is output as a dynamic symbol. */ 2373 if (h->dynindx == -1) 2374 { 2375 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2376 return FALSE; 2377 } 2378 2379 /* We also need to make an entry in the .got.plt section, which 2380 will be placed in the .got section by the linker script. */ 2381 2382 s = bfd_get_linker_section (dynobj, ".got.plt"); 2383 BFD_ASSERT (s != NULL); 2384 s->size += 4; 2385 2386 /* We also need to make an entry in the .rela.plt section. */ 2387 2388 s = bfd_get_linker_section (dynobj, ".rela.plt"); 2389 BFD_ASSERT (s != NULL); 2390 s->size += sizeof (Elf32_External_Rela); 2391 2392 return TRUE; 2393 } 2394 2395 /* If this is a weak symbol, and there is a real definition, the 2396 processor independent code will have arranged for us to see the 2397 real definition first, and we can just use the same value. */ 2398 if (h->u.weakdef != NULL) 2399 { 2400 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 2401 || h->u.weakdef->root.type == bfd_link_hash_defweak); 2402 h->root.u.def.section = h->u.weakdef->root.u.def.section; 2403 h->root.u.def.value = h->u.weakdef->root.u.def.value; 2404 return TRUE; 2405 } 2406 2407 /* This is a reference to a symbol defined by a dynamic object which 2408 is not a function. */ 2409 2410 /* If we are creating a shared library, we must presume that the 2411 only references to the symbol are via the global offset table. 2412 For such cases we need not do anything here; the relocations will 2413 be handled correctly by relocate_section. */ 2414 if (info->executable) 2415 return TRUE; 2416 2417 /* If there are no references to this symbol that do not use the 2418 GOT, we don't need to generate a copy reloc. */ 2419 if (!h->non_got_ref) 2420 return TRUE; 2421 2422 /* We must allocate the symbol in our .dynbss section, which will 2423 become part of the .bss section of the executable. There will be 2424 an entry for this symbol in the .dynsym section. The dynamic 2425 object will contain position independent code, so all references 2426 from the dynamic object to this symbol will go through the global 2427 offset table. The dynamic linker will use the .dynsym entry to 2428 determine the address it must put in the global offset table, so 2429 both the dynamic object and the regular object will refer to the 2430 same memory location for the variable. */ 2431 2432 s = bfd_get_linker_section (dynobj, ".dynbss"); 2433 BFD_ASSERT (s != NULL); 2434 2435 /* We must generate a R_CR16_COPY reloc to tell the dynamic linker to 2436 copy the initial value out of the dynamic object and into the 2437 runtime process image. We need to remember the offset into the 2438 .rela.bss section we are going to use. */ 2439 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 2440 { 2441 asection * srel; 2442 2443 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 2444 BFD_ASSERT (srel != NULL); 2445 srel->size += sizeof (Elf32_External_Rela); 2446 h->needs_copy = 1; 2447 } 2448 2449 return _bfd_elf_adjust_dynamic_copy (h, s); 2450 } 2451 2452 /* Set the sizes of the dynamic sections. */ 2453 2454 static bfd_boolean 2455 _bfd_cr16_elf_size_dynamic_sections (bfd * output_bfd, 2456 struct bfd_link_info * info) 2457 { 2458 bfd * dynobj; 2459 asection * s; 2460 bfd_boolean plt; 2461 bfd_boolean relocs; 2462 bfd_boolean reltext; 2463 2464 dynobj = elf_hash_table (info)->dynobj; 2465 BFD_ASSERT (dynobj != NULL); 2466 2467 if (elf_hash_table (info)->dynamic_sections_created) 2468 { 2469 /* Set the contents of the .interp section to the interpreter. */ 2470 if (info->executable) 2471 { 2472 #if 0 2473 s = bfd_get_linker_section (dynobj, ".interp"); 2474 BFD_ASSERT (s != NULL); 2475 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2476 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2477 #endif 2478 } 2479 } 2480 else 2481 { 2482 /* We may have created entries in the .rela.got section. 2483 However, if we are not creating the dynamic sections, we will 2484 not actually use these entries. Reset the size of .rela.got, 2485 which will cause it to get stripped from the output file 2486 below. */ 2487 s = bfd_get_linker_section (dynobj, ".rela.got"); 2488 if (s != NULL) 2489 s->size = 0; 2490 } 2491 2492 /* The check_relocs and adjust_dynamic_symbol entry points have 2493 determined the sizes of the various dynamic sections. Allocate 2494 memory for them. */ 2495 plt = FALSE; 2496 relocs = FALSE; 2497 reltext = FALSE; 2498 for (s = dynobj->sections; s != NULL; s = s->next) 2499 { 2500 const char * name; 2501 2502 if ((s->flags & SEC_LINKER_CREATED) == 0) 2503 continue; 2504 2505 /* It's OK to base decisions on the section name, because none 2506 of the dynobj section names depend upon the input files. */ 2507 name = bfd_get_section_name (dynobj, s); 2508 2509 if (strcmp (name, ".plt") == 0) 2510 { 2511 /* Remember whether there is a PLT. */ 2512 plt = s->size != 0; 2513 } 2514 else if (CONST_STRNEQ (name, ".rela")) 2515 { 2516 if (s->size != 0) 2517 { 2518 asection * target; 2519 2520 /* Remember whether there are any reloc sections other 2521 than .rela.plt. */ 2522 if (strcmp (name, ".rela.plt") != 0) 2523 { 2524 const char * outname; 2525 2526 relocs = TRUE; 2527 2528 /* If this relocation section applies to a read only 2529 section, then we probably need a DT_TEXTREL 2530 entry. The entries in the .rela.plt section 2531 really apply to the .got section, which we 2532 created ourselves and so know is not readonly. */ 2533 outname = bfd_get_section_name (output_bfd, 2534 s->output_section); 2535 target = bfd_get_section_by_name (output_bfd, outname + 5); 2536 if (target != NULL 2537 && (target->flags & SEC_READONLY) != 0 2538 && (target->flags & SEC_ALLOC) != 0) 2539 reltext = TRUE; 2540 } 2541 2542 /* We use the reloc_count field as a counter if we need 2543 to copy relocs into the output file. */ 2544 s->reloc_count = 0; 2545 } 2546 } 2547 else if (! CONST_STRNEQ (name, ".got") 2548 && strcmp (name, ".dynbss") != 0) 2549 /* It's not one of our sections, so don't allocate space. */ 2550 continue; 2551 2552 if (s->size == 0) 2553 { 2554 /* If we don't need this section, strip it from the 2555 output file. This is mostly to handle .rela.bss and 2556 .rela.plt. We must create both sections in 2557 create_dynamic_sections, because they must be created 2558 before the linker maps input sections to output 2559 sections. The linker does that before 2560 adjust_dynamic_symbol is called, and it is that 2561 function which decides whether anything needs to go 2562 into these sections. */ 2563 s->flags |= SEC_EXCLUDE; 2564 continue; 2565 } 2566 2567 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2568 continue; 2569 2570 /* Allocate memory for the section contents. We use bfd_zalloc 2571 here in case unused entries are not reclaimed before the 2572 section's contents are written out. This should not happen, 2573 but this way if it does, we get a R_CR16_NONE reloc 2574 instead of garbage. */ 2575 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 2576 if (s->contents == NULL) 2577 return FALSE; 2578 } 2579 2580 if (elf_hash_table (info)->dynamic_sections_created) 2581 { 2582 /* Add some entries to the .dynamic section. We fill in the 2583 values later, in _bfd_cr16_elf_finish_dynamic_sections, 2584 but we must add the entries now so that we get the correct 2585 size for the .dynamic section. The DT_DEBUG entry is filled 2586 in by the dynamic linker and used by the debugger. */ 2587 if (! info->executable) 2588 { 2589 if (!_bfd_elf_add_dynamic_entry (info, DT_DEBUG, 0)) 2590 return FALSE; 2591 } 2592 2593 if (plt) 2594 { 2595 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0) 2596 || !_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0) 2597 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_RELA) 2598 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0)) 2599 return FALSE; 2600 } 2601 2602 if (relocs) 2603 { 2604 if (!_bfd_elf_add_dynamic_entry (info, DT_RELA, 0) 2605 || !_bfd_elf_add_dynamic_entry (info, DT_RELASZ, 0) 2606 || !_bfd_elf_add_dynamic_entry (info, DT_RELAENT, 2607 sizeof (Elf32_External_Rela))) 2608 return FALSE; 2609 } 2610 2611 if (reltext) 2612 { 2613 if (!_bfd_elf_add_dynamic_entry (info, DT_TEXTREL, 0)) 2614 return FALSE; 2615 } 2616 } 2617 2618 return TRUE; 2619 } 2620 2621 /* Finish up dynamic symbol handling. We set the contents of various 2622 dynamic sections here. */ 2623 2624 static bfd_boolean 2625 _bfd_cr16_elf_finish_dynamic_symbol (bfd * output_bfd, 2626 struct bfd_link_info * info, 2627 struct elf_link_hash_entry * h, 2628 Elf_Internal_Sym * sym) 2629 { 2630 bfd * dynobj; 2631 2632 dynobj = elf_hash_table (info)->dynobj; 2633 2634 if (h->got.offset != (bfd_vma) -1) 2635 { 2636 asection * sgot; 2637 asection * srel; 2638 Elf_Internal_Rela rel; 2639 2640 /* This symbol has an entry in the global offset table. Set it up. */ 2641 2642 sgot = bfd_get_linker_section (dynobj, ".got"); 2643 srel = bfd_get_linker_section (dynobj, ".rela.got"); 2644 BFD_ASSERT (sgot != NULL && srel != NULL); 2645 2646 rel.r_offset = (sgot->output_section->vma 2647 + sgot->output_offset 2648 + (h->got.offset & ~1)); 2649 2650 /* If this is a -Bsymbolic link, and the symbol is defined 2651 locally, we just want to emit a RELATIVE reloc. Likewise if 2652 the symbol was forced to be local because of a version file. 2653 The entry in the global offset table will already have been 2654 initialized in the relocate_section function. */ 2655 if (info->executable 2656 && (info->symbolic || h->dynindx == -1) 2657 && h->def_regular) 2658 { 2659 rel.r_info = ELF32_R_INFO (0, R_CR16_GOT_REGREL20); 2660 rel.r_addend = (h->root.u.def.value 2661 + h->root.u.def.section->output_section->vma 2662 + h->root.u.def.section->output_offset); 2663 } 2664 else 2665 { 2666 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); 2667 rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20); 2668 rel.r_addend = 0; 2669 } 2670 2671 bfd_elf32_swap_reloca_out (output_bfd, &rel, 2672 (bfd_byte *) ((Elf32_External_Rela *) srel->contents 2673 + srel->reloc_count)); 2674 ++ srel->reloc_count; 2675 } 2676 2677 if (h->needs_copy) 2678 { 2679 asection * s; 2680 Elf_Internal_Rela rel; 2681 2682 /* This symbol needs a copy reloc. Set it up. */ 2683 BFD_ASSERT (h->dynindx != -1 2684 && (h->root.type == bfd_link_hash_defined 2685 || h->root.type == bfd_link_hash_defweak)); 2686 2687 s = bfd_get_linker_section (dynobj, ".rela.bss"); 2688 BFD_ASSERT (s != NULL); 2689 2690 rel.r_offset = (h->root.u.def.value 2691 + h->root.u.def.section->output_section->vma 2692 + h->root.u.def.section->output_offset); 2693 rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20); 2694 rel.r_addend = 0; 2695 bfd_elf32_swap_reloca_out (output_bfd, &rel, 2696 (bfd_byte *) ((Elf32_External_Rela *) s->contents 2697 + s->reloc_count)); 2698 ++ s->reloc_count; 2699 } 2700 2701 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 2702 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 2703 || h == elf_hash_table (info)->hgot) 2704 sym->st_shndx = SHN_ABS; 2705 2706 return TRUE; 2707 } 2708 2709 /* Finish up the dynamic sections. */ 2710 2711 static bfd_boolean 2712 _bfd_cr16_elf_finish_dynamic_sections (bfd * output_bfd, 2713 struct bfd_link_info * info) 2714 { 2715 bfd * dynobj; 2716 asection * sgot; 2717 asection * sdyn; 2718 2719 dynobj = elf_hash_table (info)->dynobj; 2720 2721 sgot = bfd_get_linker_section (dynobj, ".got.plt"); 2722 BFD_ASSERT (sgot != NULL); 2723 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 2724 2725 if (elf_hash_table (info)->dynamic_sections_created) 2726 { 2727 Elf32_External_Dyn * dyncon; 2728 Elf32_External_Dyn * dynconend; 2729 2730 BFD_ASSERT (sdyn != NULL); 2731 2732 dyncon = (Elf32_External_Dyn *) sdyn->contents; 2733 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 2734 2735 for (; dyncon < dynconend; dyncon++) 2736 { 2737 Elf_Internal_Dyn dyn; 2738 const char * name; 2739 asection * s; 2740 2741 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 2742 2743 switch (dyn.d_tag) 2744 { 2745 default: 2746 break; 2747 2748 case DT_PLTGOT: 2749 name = ".got"; 2750 goto get_vma; 2751 2752 case DT_JMPREL: 2753 name = ".rela.plt"; 2754 get_vma: 2755 s = bfd_get_section_by_name (output_bfd, name); 2756 BFD_ASSERT (s != NULL); 2757 dyn.d_un.d_ptr = s->vma; 2758 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2759 break; 2760 2761 case DT_PLTRELSZ: 2762 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2763 BFD_ASSERT (s != NULL); 2764 dyn.d_un.d_val = s->size; 2765 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2766 break; 2767 2768 case DT_RELASZ: 2769 /* My reading of the SVR4 ABI indicates that the 2770 procedure linkage table relocs (DT_JMPREL) should be 2771 included in the overall relocs (DT_RELA). This is 2772 what Solaris does. However, UnixWare can not handle 2773 that case. Therefore, we override the DT_RELASZ entry 2774 here to make it not include the JMPREL relocs. Since 2775 the linker script arranges for .rela.plt to follow all 2776 other relocation sections, we don't have to worry 2777 about changing the DT_RELA entry. */ 2778 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2779 if (s != NULL) 2780 dyn.d_un.d_val -= s->size; 2781 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2782 break; 2783 } 2784 } 2785 2786 } 2787 2788 /* Fill in the first three entries in the global offset table. */ 2789 if (sgot->size > 0) 2790 { 2791 if (sdyn == NULL) 2792 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2793 else 2794 bfd_put_32 (output_bfd, 2795 sdyn->output_section->vma + sdyn->output_offset, 2796 sgot->contents); 2797 } 2798 2799 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2800 2801 return TRUE; 2802 } 2803 2804 /* Given a .data.rel section and a .emreloc in-memory section, store 2805 relocation information into the .emreloc section which can be 2806 used at runtime to relocate the section. This is called by the 2807 linker when the --embedded-relocs switch is used. This is called 2808 after the add_symbols entry point has been called for all the 2809 objects, and before the final_link entry point is called. */ 2810 2811 bfd_boolean 2812 bfd_cr16_elf32_create_embedded_relocs (bfd *abfd, 2813 struct bfd_link_info *info, 2814 asection *datasec, 2815 asection *relsec, 2816 char **errmsg) 2817 { 2818 Elf_Internal_Shdr *symtab_hdr; 2819 Elf_Internal_Sym *isymbuf = NULL; 2820 Elf_Internal_Rela *internal_relocs = NULL; 2821 Elf_Internal_Rela *irel, *irelend; 2822 bfd_byte *p; 2823 bfd_size_type amt; 2824 2825 BFD_ASSERT (! info->relocatable); 2826 2827 *errmsg = NULL; 2828 2829 if (datasec->reloc_count == 0) 2830 return TRUE; 2831 2832 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2833 2834 /* Get a copy of the native relocations. */ 2835 internal_relocs = (_bfd_elf_link_read_relocs 2836 (abfd, datasec, NULL, NULL, info->keep_memory)); 2837 if (internal_relocs == NULL) 2838 goto error_return; 2839 2840 amt = (bfd_size_type) datasec->reloc_count * 8; 2841 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 2842 if (relsec->contents == NULL) 2843 goto error_return; 2844 2845 p = relsec->contents; 2846 2847 irelend = internal_relocs + datasec->reloc_count; 2848 for (irel = internal_relocs; irel < irelend; irel++, p += 8) 2849 { 2850 asection *targetsec; 2851 2852 /* We are going to write a four byte longword into the runtime 2853 reloc section. The longword will be the address in the data 2854 section which must be relocated. It is followed by the name 2855 of the target section NUL-padded or truncated to 8 2856 characters. */ 2857 2858 /* We can only relocate absolute longword relocs at run time. */ 2859 if (!((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a) 2860 || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32))) 2861 { 2862 *errmsg = _("unsupported reloc type"); 2863 bfd_set_error (bfd_error_bad_value); 2864 goto error_return; 2865 } 2866 2867 /* Get the target section referred to by the reloc. */ 2868 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2869 { 2870 /* A local symbol. */ 2871 Elf_Internal_Sym *isym; 2872 2873 /* Read this BFD's local symbols if we haven't done so already. */ 2874 if (isymbuf == NULL) 2875 { 2876 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2877 if (isymbuf == NULL) 2878 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2879 symtab_hdr->sh_info, 0, 2880 NULL, NULL, NULL); 2881 if (isymbuf == NULL) 2882 goto error_return; 2883 } 2884 2885 isym = isymbuf + ELF32_R_SYM (irel->r_info); 2886 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2887 } 2888 else 2889 { 2890 unsigned long indx; 2891 struct elf_link_hash_entry *h; 2892 2893 /* An external symbol. */ 2894 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2895 h = elf_sym_hashes (abfd)[indx]; 2896 BFD_ASSERT (h != NULL); 2897 if (h->root.type == bfd_link_hash_defined 2898 || h->root.type == bfd_link_hash_defweak) 2899 targetsec = h->root.u.def.section; 2900 else 2901 targetsec = NULL; 2902 } 2903 2904 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 2905 memset (p + 4, 0, 4); 2906 if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a) 2907 && (targetsec != NULL) ) 2908 strncpy ((char *) p + 4, targetsec->output_section->name, 4); 2909 } 2910 2911 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 2912 free (isymbuf); 2913 if (internal_relocs != NULL 2914 && elf_section_data (datasec)->relocs != internal_relocs) 2915 free (internal_relocs); 2916 return TRUE; 2917 2918 error_return: 2919 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 2920 free (isymbuf); 2921 if (internal_relocs != NULL 2922 && elf_section_data (datasec)->relocs != internal_relocs) 2923 free (internal_relocs); 2924 return FALSE; 2925 } 2926 2927 2928 /* Classify relocation types, such that combreloc can sort them 2929 properly. */ 2930 2931 static enum elf_reloc_type_class 2932 _bfd_cr16_elf_reloc_type_class (const Elf_Internal_Rela *rela) 2933 { 2934 switch ((int) ELF32_R_TYPE (rela->r_info)) 2935 { 2936 case R_CR16_GOT_REGREL20: 2937 case R_CR16_GOTC_REGREL20: 2938 return reloc_class_relative; 2939 default: 2940 return reloc_class_normal; 2941 } 2942 } 2943 2944 /* Definitions for setting CR16 target vector. */ 2945 #define TARGET_LITTLE_SYM bfd_elf32_cr16_vec 2946 #define TARGET_LITTLE_NAME "elf32-cr16" 2947 #define ELF_ARCH bfd_arch_cr16 2948 #define ELF_MACHINE_CODE EM_CR16 2949 #define ELF_MACHINE_ALT1 EM_CR16_OLD 2950 #define ELF_MAXPAGESIZE 0x1 2951 #define elf_symbol_leading_char '_' 2952 2953 #define bfd_elf32_bfd_reloc_type_lookup elf_cr16_reloc_type_lookup 2954 #define bfd_elf32_bfd_reloc_name_lookup elf_cr16_reloc_name_lookup 2955 #define elf_info_to_howto elf_cr16_info_to_howto 2956 #define elf_info_to_howto_rel 0 2957 #define elf_backend_relocate_section elf32_cr16_relocate_section 2958 #define bfd_elf32_bfd_relax_section elf32_cr16_relax_section 2959 #define bfd_elf32_bfd_get_relocated_section_contents \ 2960 elf32_cr16_get_relocated_section_contents 2961 #define elf_backend_gc_mark_hook elf32_cr16_gc_mark_hook 2962 #define elf_backend_gc_sweep_hook elf32_cr16_gc_sweep_hook 2963 #define elf_backend_can_gc_sections 1 2964 #define elf_backend_rela_normal 1 2965 #define elf_backend_check_relocs cr16_elf_check_relocs 2966 /* So we can set bits in e_flags. */ 2967 #define elf_backend_final_write_processing \ 2968 _bfd_cr16_elf_final_write_processing 2969 #define elf_backend_object_p _bfd_cr16_elf_object_p 2970 2971 #define bfd_elf32_bfd_merge_private_bfd_data \ 2972 _bfd_cr16_elf_merge_private_bfd_data 2973 2974 2975 #define bfd_elf32_bfd_link_hash_table_create \ 2976 elf32_cr16_link_hash_table_create 2977 #define bfd_elf32_bfd_link_hash_table_free \ 2978 elf32_cr16_link_hash_table_free 2979 2980 #define elf_backend_create_dynamic_sections \ 2981 _bfd_cr16_elf_create_dynamic_sections 2982 #define elf_backend_adjust_dynamic_symbol \ 2983 _bfd_cr16_elf_adjust_dynamic_symbol 2984 #define elf_backend_size_dynamic_sections \ 2985 _bfd_cr16_elf_size_dynamic_sections 2986 #define elf_backend_omit_section_dynsym \ 2987 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 2988 #define elf_backend_finish_dynamic_symbol \ 2989 _bfd_cr16_elf_finish_dynamic_symbol 2990 #define elf_backend_finish_dynamic_sections \ 2991 _bfd_cr16_elf_finish_dynamic_sections 2992 2993 #define elf_backend_reloc_type_class _bfd_cr16_elf_reloc_type_class 2994 2995 2996 #define elf_backend_want_got_plt 1 2997 #define elf_backend_plt_readonly 1 2998 #define elf_backend_want_plt_sym 0 2999 #define elf_backend_got_header_size 12 3000 3001 #include "elf32-target.h" 3002
Indexes created Sun Mar 01 05:31:48 UTC 2026