1/* ADI Blackfin BFD support for 32-bit ELF. 2 Copyright 2005, 2006 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 19 USA. */ 20 21#include "bfd.h" 22#include "sysdep.h" 23#include "libbfd.h" 24#include "elf-bfd.h" 25#include "elf/bfin.h" 26#include "elf/dwarf2.h" 27#include "hashtab.h" 28 29/* FUNCTION : bfin_pltpc_reloc 30 ABSTRACT : TODO : figure out how to handle pltpc relocs. */ 31static bfd_reloc_status_type 32bfin_pltpc_reloc ( 33 bfd *abfd ATTRIBUTE_UNUSED, 34 arelent *reloc_entry ATTRIBUTE_UNUSED, 35 asymbol *symbol ATTRIBUTE_UNUSED, 36 PTR data ATTRIBUTE_UNUSED, 37 asection *input_section ATTRIBUTE_UNUSED, 38 bfd *output_bfd ATTRIBUTE_UNUSED, 39 char **error_message ATTRIBUTE_UNUSED) 40{ 41 bfd_reloc_status_type flag = bfd_reloc_ok; 42 return flag; 43} 44 45 46static bfd_reloc_status_type 47bfin_pcrel24_reloc (bfd *abfd, 48 arelent *reloc_entry, 49 asymbol *symbol, 50 PTR data, 51 asection *input_section, 52 bfd *output_bfd, 53 char **error_message ATTRIBUTE_UNUSED) 54{ 55 bfd_vma relocation; 56 bfd_size_type addr = reloc_entry->address; 57 bfd_vma output_base = 0; 58 reloc_howto_type *howto = reloc_entry->howto; 59 asection *output_section; 60 bfd_boolean relocatable = (output_bfd != NULL); 61 62 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 63 return bfd_reloc_outofrange; 64 65 if (bfd_is_und_section (symbol->section) 66 && (symbol->flags & BSF_WEAK) == 0 67 && !relocatable) 68 return bfd_reloc_undefined; 69 70 if (bfd_is_com_section (symbol->section)) 71 relocation = 0; 72 else 73 relocation = symbol->value; 74 75 output_section = symbol->section->output_section; 76 77 if (relocatable) 78 output_base = 0; 79 else 80 output_base = output_section->vma; 81 82 if (!relocatable || !strcmp (symbol->name, symbol->section->name)) 83 relocation += output_base + symbol->section->output_offset; 84 85 if (!relocatable && !strcmp (symbol->name, symbol->section->name)) 86 relocation += reloc_entry->addend; 87 88 relocation -= input_section->output_section->vma + input_section->output_offset; 89 relocation -= reloc_entry->address; 90 91 if (howto->complain_on_overflow != complain_overflow_dont) 92 { 93 bfd_reloc_status_type status; 94 status = bfd_check_overflow (howto->complain_on_overflow, 95 howto->bitsize, 96 howto->rightshift, 97 bfd_arch_bits_per_address(abfd), 98 relocation); 99 if (status != bfd_reloc_ok) 100 return status; 101 } 102 103 /* if rightshift is 1 and the number odd, return error. */ 104 if (howto->rightshift && (relocation & 0x01)) 105 { 106 fprintf(stderr, "relocation should be even number\n"); 107 return bfd_reloc_overflow; 108 } 109 110 relocation >>= (bfd_vma) howto->rightshift; 111 /* Shift everything up to where it's going to be used. */ 112 113 relocation <<= (bfd_vma) howto->bitpos; 114 115 if (relocatable) 116 { 117 reloc_entry->address += input_section->output_offset; 118 reloc_entry->addend += symbol->section->output_offset; 119 } 120 121 { 122 short x; 123 124 /* We are getting reloc_entry->address 2 byte off from 125 the start of instruction. Assuming absolute postion 126 of the reloc data. But, following code had been written assuming 127 reloc address is starting at begining of instruction. 128 To compensate that I have increased the value of 129 relocation by 1 (effectively 2) and used the addr -2 instead of addr. */ 130 131 relocation += 1; 132 x = bfd_get_16 (abfd, (bfd_byte *) data + addr - 2); 133 x = (x & 0xff00) | ((relocation >> 16) & 0xff); 134 bfd_put_16 (abfd, x, (unsigned char *) data + addr - 2); 135 136 x = bfd_get_16 (abfd, (bfd_byte *) data + addr); 137 x = relocation & 0xFFFF; 138 bfd_put_16 (abfd, x, (unsigned char *) data + addr ); 139 } 140 return bfd_reloc_ok; 141} 142 143static bfd_reloc_status_type 144bfin_imm16_reloc (bfd *abfd, 145 arelent *reloc_entry, 146 asymbol *symbol, 147 PTR data, 148 asection *input_section, 149 bfd *output_bfd, 150 char **error_message ATTRIBUTE_UNUSED) 151{ 152 bfd_vma relocation, x; 153 bfd_size_type reloc_addr = reloc_entry->address; 154 bfd_vma output_base = 0; 155 reloc_howto_type *howto = reloc_entry->howto; 156 asection *output_section; 157 bfd_boolean relocatable = (output_bfd != NULL); 158 159 /* Is the address of the relocation really within the section? */ 160 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 161 return bfd_reloc_outofrange; 162 163 if (bfd_is_und_section (symbol->section) 164 && (symbol->flags & BSF_WEAK) == 0 165 && !relocatable) 166 return bfd_reloc_undefined; 167 168 output_section = symbol->section->output_section; 169 relocation = symbol->value; 170 171 /* Convert input-section-relative symbol value to absolute. */ 172 if (relocatable) 173 output_base = 0; 174 else 175 output_base = output_section->vma; 176 177 if (!relocatable || !strcmp (symbol->name, symbol->section->name)) 178 relocation += output_base + symbol->section->output_offset; 179 180 /* Add in supplied addend. */ 181 relocation += reloc_entry->addend; 182 183 if (relocatable) 184 { 185 reloc_entry->address += input_section->output_offset; 186 reloc_entry->addend += symbol->section->output_offset; 187 } 188 else 189 { 190 reloc_entry->addend = 0; 191 } 192 193 if (howto->complain_on_overflow != complain_overflow_dont) 194 { 195 bfd_reloc_status_type flag; 196 flag = bfd_check_overflow (howto->complain_on_overflow, 197 howto->bitsize, 198 howto->rightshift, 199 bfd_arch_bits_per_address(abfd), 200 relocation); 201 if (flag != bfd_reloc_ok) 202 return flag; 203 } 204 205 /* Here the variable relocation holds the final address of the 206 symbol we are relocating against, plus any addend. */ 207 208 relocation >>= (bfd_vma) howto->rightshift; 209 x = relocation; 210 bfd_put_16 (abfd, x, (unsigned char *) data + reloc_addr); 211 return bfd_reloc_ok; 212} 213 214 215static bfd_reloc_status_type 216bfin_byte4_reloc (bfd *abfd, 217 arelent *reloc_entry, 218 asymbol *symbol, 219 PTR data, 220 asection *input_section, 221 bfd *output_bfd, 222 char **error_message ATTRIBUTE_UNUSED) 223{ 224 bfd_vma relocation, x; 225 bfd_size_type addr = reloc_entry->address; 226 bfd_vma output_base = 0; 227 asection *output_section; 228 bfd_boolean relocatable = (output_bfd != NULL); 229 230 /* Is the address of the relocation really within the section? */ 231 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 232 return bfd_reloc_outofrange; 233 234 if (bfd_is_und_section (symbol->section) 235 && (symbol->flags & BSF_WEAK) == 0 236 && !relocatable) 237 return bfd_reloc_undefined; 238 239 output_section = symbol->section->output_section; 240 relocation = symbol->value; 241 /* Convert input-section-relative symbol value to absolute. */ 242 if (relocatable) 243 output_base = 0; 244 else 245 output_base = output_section->vma; 246 247 if ((symbol->name 248 && symbol->section->name 249 && !strcmp (symbol->name, symbol->section->name)) 250 || !relocatable) 251 { 252 relocation += output_base + symbol->section->output_offset; 253 } 254 255 relocation += reloc_entry->addend; 256 257 if (relocatable) 258 { 259 /* This output will be relocatable ... like ld -r. */ 260 reloc_entry->address += input_section->output_offset; 261 reloc_entry->addend += symbol->section->output_offset; 262 } 263 else 264 { 265 reloc_entry->addend = 0; 266 } 267 268 /* Here the variable relocation holds the final address of the 269 symbol we are relocating against, plus any addend. */ 270 x = relocation & 0xFFFF0000; 271 x >>=16; 272 bfd_put_16 (abfd, x, (unsigned char *) data + addr + 2); 273 274 x = relocation & 0x0000FFFF; 275 bfd_put_16 (abfd, x, (unsigned char *) data + addr); 276 return bfd_reloc_ok; 277} 278 279/* bfin_bfd_reloc handles the blackfin arithmetic relocations. 280 Use this instead of bfd_perform_relocation. */ 281static bfd_reloc_status_type 282bfin_bfd_reloc (bfd *abfd, 283 arelent *reloc_entry, 284 asymbol *symbol, 285 PTR data, 286 asection *input_section, 287 bfd *output_bfd, 288 char **error_message ATTRIBUTE_UNUSED) 289{ 290 bfd_vma relocation; 291 bfd_size_type addr = reloc_entry->address; 292 bfd_vma output_base = 0; 293 reloc_howto_type *howto = reloc_entry->howto; 294 asection *output_section; 295 bfd_boolean relocatable = (output_bfd != NULL); 296 297 /* Is the address of the relocation really within the section? */ 298 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 299 return bfd_reloc_outofrange; 300 301 if (bfd_is_und_section (symbol->section) 302 && (symbol->flags & BSF_WEAK) == 0 303 && !relocatable) 304 return bfd_reloc_undefined; 305 306 /* Get symbol value. (Common symbols are special.) */ 307 if (bfd_is_com_section (symbol->section)) 308 relocation = 0; 309 else 310 relocation = symbol->value; 311 312 output_section = symbol->section->output_section; 313 314 /* Convert input-section-relative symbol value to absolute. */ 315 if (relocatable) 316 output_base = 0; 317 else 318 output_base = output_section->vma; 319 320 if (!relocatable || !strcmp (symbol->name, symbol->section->name)) 321 relocation += output_base + symbol->section->output_offset; 322 323 if (!relocatable && !strcmp (symbol->name, symbol->section->name)) 324 { 325 /* Add in supplied addend. */ 326 relocation += reloc_entry->addend; 327 } 328 329 /* Here the variable relocation holds the final address of the 330 symbol we are relocating against, plus any addend. */ 331 332 if (howto->pc_relative == TRUE) 333 { 334 relocation -= input_section->output_section->vma + input_section->output_offset; 335 336 if (howto->pcrel_offset == TRUE) 337 relocation -= reloc_entry->address; 338 } 339 340 if (relocatable) 341 { 342 reloc_entry->address += input_section->output_offset; 343 reloc_entry->addend += symbol->section->output_offset; 344 } 345 346 if (howto->complain_on_overflow != complain_overflow_dont) 347 { 348 bfd_reloc_status_type status; 349 350 status = bfd_check_overflow (howto->complain_on_overflow, 351 howto->bitsize, 352 howto->rightshift, 353 bfd_arch_bits_per_address(abfd), 354 relocation); 355 if (status != bfd_reloc_ok) 356 return status; 357 } 358 359 /* If rightshift is 1 and the number odd, return error. */ 360 if (howto->rightshift && (relocation & 0x01)) 361 { 362 fprintf(stderr, "relocation should be even number\n"); 363 return bfd_reloc_overflow; 364 } 365 366 relocation >>= (bfd_vma) howto->rightshift; 367 368 /* Shift everything up to where it's going to be used. */ 369 370 relocation <<= (bfd_vma) howto->bitpos; 371 372#define DOIT(x) \ 373 x = ( (x & ~howto->dst_mask) | (relocation & howto->dst_mask)) 374 375 /* handle 8 and 16 bit relocations here. */ 376 switch (howto->size) 377 { 378 case 0: 379 { 380 char x = bfd_get_8 (abfd, (char *) data + addr); 381 DOIT (x); 382 bfd_put_8 (abfd, x, (unsigned char *) data + addr); 383 } 384 break; 385 386 case 1: 387 { 388 unsigned short x = bfd_get_16 (abfd, (bfd_byte *) data + addr); 389 DOIT (x); 390 bfd_put_16 (abfd, (bfd_vma) x, (unsigned char *) data + addr); 391 } 392 break; 393 394 default: 395 return bfd_reloc_other; 396 } 397 398 return bfd_reloc_ok; 399} 400 401/* HOWTO Table for blackfin. 402 Blackfin relocations are fairly complicated. 403 Some of the salient features are 404 a. Even numbered offsets. A number of (not all) relocations are 405 even numbered. This means that the rightmost bit is not stored. 406 Needs to right shift by 1 and check to see if value is not odd 407 b. A relocation can be an expression. An expression takes on 408 a variety of relocations arranged in a stack. 409 As a result, we cannot use the standard generic function as special 410 function. We will have our own, which is very similar to the standard 411 generic function except that it understands how to get the value from 412 the relocation stack. . */ 413 414#define BFIN_RELOC_MIN 0 415#define BFIN_RELOC_MAX 0x21 416#define BFIN_GNUEXT_RELOC_MIN 0x40 417#define BFIN_GNUEXT_RELOC_MAX 0x43 418#define BFIN_ARELOC_MIN 0xE0 419#define BFIN_ARELOC_MAX 0xF3 420 421static reloc_howto_type bfin_howto_table [] = 422{ 423 /* This reloc does nothing. . */ 424 HOWTO (R_unused0, /* type. */ 425 0, /* rightshift. */ 426 2, /* size (0 = byte, 1 = short, 2 = long). */ 427 32, /* bitsize. */ 428 FALSE, /* pc_relative. */ 429 0, /* bitpos. */ 430 complain_overflow_bitfield, /* complain_on_overflow. */ 431 bfd_elf_generic_reloc, /* special_function. */ 432 "R_unused0", /* name. */ 433 FALSE, /* partial_inplace. */ 434 0, /* src_mask. */ 435 0, /* dst_mask. */ 436 FALSE), /* pcrel_offset. */ 437 438 HOWTO (R_pcrel5m2, /* type. */ 439 1, /* rightshift. */ 440 1, /* size (0 = byte, 1 = short, 2 = long).. */ 441 4, /* bitsize. */ 442 TRUE, /* pc_relative. */ 443 0, /* bitpos. */ 444 complain_overflow_unsigned, /* complain_on_overflow. */ 445 bfin_bfd_reloc, /* special_function. */ 446 "R_pcrel5m2", /* name. */ 447 FALSE, /* partial_inplace. */ 448 0, /* src_mask. */ 449 0x0000000F, /* dst_mask. */ 450 FALSE), /* pcrel_offset. */ 451 452 HOWTO (R_unused1, /* type. */ 453 0, /* rightshift. */ 454 2, /* size (0 = byte, 1 = short, 2 = long). */ 455 32, /* bitsize. */ 456 FALSE, /* pc_relative. */ 457 0, /* bitpos. */ 458 complain_overflow_bitfield, /* complain_on_overflow. */ 459 bfd_elf_generic_reloc, /* special_function. */ 460 "R_unused1", /* name. */ 461 FALSE, /* partial_inplace. */ 462 0, /* src_mask. */ 463 0, /* dst_mask. */ 464 FALSE), /* pcrel_offset. */ 465 466 HOWTO (R_pcrel10, /* type. */ 467 1, /* rightshift. */ 468 1, /* size (0 = byte, 1 = short, 2 = long). */ 469 10, /* bitsize. */ 470 TRUE, /* pc_relative. */ 471 0, /* bitpos. */ 472 complain_overflow_signed, /* complain_on_overflow. */ 473 bfin_bfd_reloc, /* special_function. */ 474 "R_pcrel10", /* name. */ 475 FALSE, /* partial_inplace. */ 476 0, /* src_mask. */ 477 0x000003FF, /* dst_mask. */ 478 TRUE), /* pcrel_offset. */ 479 480 HOWTO (R_pcrel12_jump, /* type. */ 481 1, /* rightshift. */ 482 /* the offset is actually 13 bit 483 aligned on a word boundary so 484 only 12 bits have to be used. 485 Right shift the rightmost bit.. */ 486 1, /* size (0 = byte, 1 = short, 2 = long). */ 487 12, /* bitsize. */ 488 TRUE, /* pc_relative. */ 489 0, /* bitpos. */ 490 complain_overflow_signed, /* complain_on_overflow. */ 491 bfin_bfd_reloc, /* special_function. */ 492 "R_pcrel12_jump", /* name. */ 493 FALSE, /* partial_inplace. */ 494 0, /* src_mask. */ 495 0x0FFF, /* dst_mask. */ 496 TRUE), /* pcrel_offset. */ 497 498 HOWTO (R_rimm16, /* type. */ 499 0, /* rightshift. */ 500 1, /* size (0 = byte, 1 = short, 2 = long). */ 501 16, /* bitsize. */ 502 FALSE, /* pc_relative. */ 503 0, /* bitpos. */ 504 complain_overflow_signed, /* complain_on_overflow. */ 505 bfin_imm16_reloc, /* special_function. */ 506 "R_rimm16", /* name. */ 507 FALSE, /* partial_inplace. */ 508 0, /* src_mask. */ 509 0x0000FFFF, /* dst_mask. */ 510 TRUE), /* pcrel_offset. */ 511 512 HOWTO (R_luimm16, /* type. */ 513 0, /* rightshift. */ 514 1, /* size (0 = byte, 1 = short, 2 = long). */ 515 16, /* bitsize. */ 516 FALSE, /* pc_relative. */ 517 0, /* bitpos. */ 518 complain_overflow_dont, /* complain_on_overflow. */ 519 bfin_imm16_reloc, /* special_function. */ 520 "R_luimm16", /* name. */ 521 FALSE, /* partial_inplace. */ 522 0, /* src_mask. */ 523 0x0000FFFF, /* dst_mask. */ 524 TRUE), /* pcrel_offset. */ 525 526 HOWTO (R_huimm16, /* type. */ 527 16, /* rightshift. */ 528 1, /* size (0 = byte, 1 = short, 2 = long). */ 529 16, /* bitsize. */ 530 FALSE, /* pc_relative. */ 531 0, /* bitpos. */ 532 complain_overflow_unsigned, /* complain_on_overflow. */ 533 bfin_imm16_reloc, /* special_function. */ 534 "R_huimm16", /* name. */ 535 FALSE, /* partial_inplace. */ 536 0, /* src_mask. */ 537 0x0000FFFF, /* dst_mask. */ 538 TRUE), /* pcrel_offset. */ 539 540 HOWTO (R_pcrel12_jump_s, /* type. */ 541 1, /* rightshift. */ 542 1, /* size (0 = byte, 1 = short, 2 = long). */ 543 12, /* bitsize. */ 544 TRUE, /* pc_relative. */ 545 0, /* bitpos. */ 546 complain_overflow_signed, /* complain_on_overflow. */ 547 bfin_bfd_reloc, /* special_function. */ 548 "R_pcrel12_jump_s", /* name. */ 549 FALSE, /* partial_inplace. */ 550 0, /* src_mask. */ 551 0x00000FFF, /* dst_mask. */ 552 TRUE), /* pcrel_offset. */ 553 554 HOWTO (R_pcrel24_jump_x, /* type. */ 555 1, /* rightshift. */ 556 2, /* size (0 = byte, 1 = short, 2 = long). */ 557 24, /* bitsize. */ 558 TRUE, /* pc_relative. */ 559 0, /* bitpos. */ 560 complain_overflow_signed, /* complain_on_overflow. */ 561 bfin_pcrel24_reloc, /* special_function. */ 562 "R_pcrel24_jump_x", /* name. */ 563 FALSE, /* partial_inplace. */ 564 0, /* src_mask. */ 565 0x00FFFFFF, /* dst_mask. */ 566 TRUE), /* pcrel_offset. */ 567 568 HOWTO (R_pcrel24, /* type. */ 569 1, /* rightshift. */ 570 2, /* size (0 = byte, 1 = short, 2 = long). */ 571 24, /* bitsize. */ 572 TRUE, /* pc_relative. */ 573 0, /* bitpos. */ 574 complain_overflow_signed, /* complain_on_overflow. */ 575 bfin_pcrel24_reloc, /* special_function. */ 576 "R_pcrel24", /* name. */ 577 FALSE, /* partial_inplace. */ 578 0, /* src_mask. */ 579 0x00FFFFFF, /* dst_mask. */ 580 TRUE), /* pcrel_offset. */ 581 582 HOWTO (R_unusedb, /* type. */ 583 0, /* rightshift. */ 584 2, /* size (0 = byte, 1 = short, 2 = long). */ 585 32, /* bitsize. */ 586 FALSE, /* pc_relative. */ 587 0, /* bitpos. */ 588 complain_overflow_dont, /* complain_on_overflow. */ 589 bfd_elf_generic_reloc, /* special_function. */ 590 "R_unusedb", /* name. */ 591 FALSE, /* partial_inplace. */ 592 0, /* src_mask. */ 593 0, /* dst_mask. */ 594 FALSE), /* pcrel_offset. */ 595 596 HOWTO (R_unusedc, /* type. */ 597 0, /* rightshift. */ 598 2, /* size (0 = byte, 1 = short, 2 = long). */ 599 32, /* bitsize. */ 600 FALSE, /* pc_relative. */ 601 0, /* bitpos. */ 602 complain_overflow_dont, /* complain_on_overflow. */ 603 bfd_elf_generic_reloc, /* special_function. */ 604 "R_unusedc", /* name. */ 605 FALSE, /* partial_inplace. */ 606 0, /* src_mask. */ 607 0, /* dst_mask. */ 608 FALSE), /* pcrel_offset. */ 609 610 HOWTO (R_pcrel24_jump_l, /* type. */ 611 1, /* rightshift. */ 612 2, /* size (0 = byte, 1 = short, 2 = long). */ 613 24, /* bitsize. */ 614 TRUE, /* pc_relative. */ 615 0, /* bitpos. */ 616 complain_overflow_signed, /* complain_on_overflow. */ 617 bfin_pcrel24_reloc, /* special_function. */ 618 "R_pcrel24_jump_l", /* name. */ 619 FALSE, /* partial_inplace. */ 620 0, /* src_mask. */ 621 0x00FFFFFF, /* dst_mask. */ 622 TRUE), /* pcrel_offset. */ 623 624 HOWTO (R_pcrel24_call_x, /* type. */ 625 1, /* rightshift. */ 626 2, /* size (0 = byte, 1 = short, 2 = long). */ 627 24, /* bitsize. */ 628 TRUE, /* pc_relative. */ 629 0, /* bitpos. */ 630 complain_overflow_signed, /* complain_on_overflow. */ 631 bfin_pcrel24_reloc, /* special_function. */ 632 "R_pcrel24_call_x", /* name. */ 633 FALSE, /* partial_inplace. */ 634 0, /* src_mask. */ 635 0x00FFFFFF, /* dst_mask. */ 636 TRUE), /* pcrel_offset. */ 637 638 HOWTO (R_var_eq_symb, /* type. */ 639 0, /* rightshift. */ 640 2, /* size (0 = byte, 1 = short, 2 = long). */ 641 32, /* bitsize. */ 642 FALSE, /* pc_relative. */ 643 0, /* bitpos. */ 644 complain_overflow_bitfield, /* complain_on_overflow. */ 645 bfin_bfd_reloc, /* special_function. */ 646 "R_var_eq_symb", /* name. */ 647 FALSE, /* partial_inplace. */ 648 0, /* src_mask. */ 649 0, /* dst_mask. */ 650 FALSE), /* pcrel_offset. */ 651 652 HOWTO (R_byte_data, /* type. */ 653 0, /* rightshift. */ 654 0, /* size (0 = byte, 1 = short, 2 = long). */ 655 8, /* bitsize. */ 656 FALSE, /* pc_relative. */ 657 0, /* bitpos. */ 658 complain_overflow_unsigned, /* complain_on_overflow. */ 659 bfin_bfd_reloc, /* special_function. */ 660 "R_byte_data", /* name. */ 661 FALSE, /* partial_inplace. */ 662 0, /* src_mask. */ 663 0xFF, /* dst_mask. */ 664 TRUE), /* pcrel_offset. */ 665 666 HOWTO (R_byte2_data, /* type. */ 667 0, /* rightshift. */ 668 1, /* size (0 = byte, 1 = short, 2 = long). */ 669 16, /* bitsize. */ 670 FALSE, /* pc_relative. */ 671 0, /* bitpos. */ 672 complain_overflow_signed, /* complain_on_overflow. */ 673 bfin_bfd_reloc, /* special_function. */ 674 "R_byte2_data", /* name. */ 675 FALSE, /* partial_inplace. */ 676 0, /* src_mask. */ 677 0xFFFF, /* dst_mask. */ 678 TRUE), /* pcrel_offset. */ 679 680 HOWTO (R_byte4_data, /* type. */ 681 0, /* rightshift. */ 682 2, /* size (0 = byte, 1 = short, 2 = long). */ 683 32, /* bitsize. */ 684 FALSE, /* pc_relative. */ 685 0, /* bitpos. */ 686 complain_overflow_unsigned, /* complain_on_overflow. */ 687 bfin_byte4_reloc, /* special_function. */ 688 "R_byte4_data", /* name. */ 689 FALSE, /* partial_inplace. */ 690 0, /* src_mask. */ 691 0xFFFFFFFF, /* dst_mask. */ 692 TRUE), /* pcrel_offset. */ 693 694 HOWTO (R_pcrel11, /* type. */ 695 1, /* rightshift. */ 696 1, /* size (0 = byte, 1 = short, 2 = long). */ 697 10, /* bitsize. */ 698 TRUE, /* pc_relative. */ 699 0, /* bitpos. */ 700 complain_overflow_unsigned, /* complain_on_overflow. */ 701 bfin_bfd_reloc, /* special_function. */ 702 "R_pcrel11", /* name. */ 703 FALSE, /* partial_inplace. */ 704 0, /* src_mask. */ 705 0x000003FF, /* dst_mask. */ 706 FALSE), /* pcrel_offset. */ 707 708 709 /* A 18-bit signed operand with the GOT offset for the address of 710 the symbol. */ 711 HOWTO (R_BFIN_GOT17M4, /* type */ 712 2, /* rightshift */ 713 1, /* size (0 = byte, 1 = short, 2 = long) */ 714 16, /* bitsize */ 715 FALSE, /* pc_relative */ 716 0, /* bitpos */ 717 complain_overflow_signed, /* complain_on_overflow */ 718 bfd_elf_generic_reloc, /* special_function */ 719 "R_BFIN_GOT12", /* name */ 720 FALSE, /* partial_inplace */ 721 0xffff, /* src_mask */ 722 0xffff, /* dst_mask */ 723 FALSE), /* pcrel_offset */ 724 725 /* The upper 16 bits of the GOT offset for the address of the 726 symbol. */ 727 HOWTO (R_BFIN_GOTHI, /* type */ 728 0, /* rightshift */ 729 1, /* size (0 = byte, 1 = short, 2 = long) */ 730 16, /* bitsize */ 731 FALSE, /* pc_relative */ 732 0, /* bitpos */ 733 complain_overflow_dont, /* complain_on_overflow */ 734 bfd_elf_generic_reloc, /* special_function */ 735 "R_BFIN_GOTHI", /* name */ 736 FALSE, /* partial_inplace */ 737 0xffff, /* src_mask */ 738 0xffff, /* dst_mask */ 739 FALSE), /* pcrel_offset */ 740 741 /* The lower 16 bits of the GOT offset for the address of the 742 symbol. */ 743 HOWTO (R_BFIN_GOTLO, /* type */ 744 0, /* rightshift */ 745 1, /* size (0 = byte, 1 = short, 2 = long) */ 746 16, /* bitsize */ 747 FALSE, /* pc_relative */ 748 0, /* bitpos */ 749 complain_overflow_dont, /* complain_on_overflow */ 750 bfd_elf_generic_reloc, /* special_function */ 751 "R_BFIN_GOTLO", /* name */ 752 FALSE, /* partial_inplace */ 753 0xffff, /* src_mask */ 754 0xffff, /* dst_mask */ 755 FALSE), /* pcrel_offset */ 756 757 /* The 32-bit address of the canonical descriptor of a function. */ 758 HOWTO (R_BFIN_FUNCDESC, /* type */ 759 0, /* rightshift */ 760 2, /* size (0 = byte, 1 = short, 2 = long) */ 761 32, /* bitsize */ 762 FALSE, /* pc_relative */ 763 0, /* bitpos */ 764 complain_overflow_bitfield, /* complain_on_overflow */ 765 bfd_elf_generic_reloc, /* special_function */ 766 "R_BFIN_FUNCDESC", /* name */ 767 FALSE, /* partial_inplace */ 768 0xffffffff, /* src_mask */ 769 0xffffffff, /* dst_mask */ 770 FALSE), /* pcrel_offset */ 771 772 /* A 12-bit signed operand with the GOT offset for the address of 773 canonical descriptor of a function. */ 774 HOWTO (R_BFIN_FUNCDESC_GOT17M4, /* type */ 775 2, /* rightshift */ 776 1, /* size (0 = byte, 1 = short, 2 = long) */ 777 16, /* bitsize */ 778 FALSE, /* pc_relative */ 779 0, /* bitpos */ 780 complain_overflow_signed, /* complain_on_overflow */ 781 bfd_elf_generic_reloc, /* special_function */ 782 "R_BFIN_FUNCDESC_GOT17M4", /* name */ 783 FALSE, /* partial_inplace */ 784 0xffff, /* src_mask */ 785 0xffff, /* dst_mask */ 786 FALSE), /* pcrel_offset */ 787 788 /* The upper 16 bits of the GOT offset for the address of the 789 canonical descriptor of a function. */ 790 HOWTO (R_BFIN_FUNCDESC_GOTHI, /* type */ 791 0, /* rightshift */ 792 1, /* size (0 = byte, 1 = short, 2 = long) */ 793 16, /* bitsize */ 794 FALSE, /* pc_relative */ 795 0, /* bitpos */ 796 complain_overflow_dont, /* complain_on_overflow */ 797 bfd_elf_generic_reloc, /* special_function */ 798 "R_BFIN_FUNCDESC_GOTHI", /* name */ 799 FALSE, /* partial_inplace */ 800 0xffff, /* src_mask */ 801 0xffff, /* dst_mask */ 802 FALSE), /* pcrel_offset */ 803 804 /* The lower 16 bits of the GOT offset for the address of the 805 canonical descriptor of a function. */ 806 HOWTO (R_BFIN_FUNCDESC_GOTLO, /* type */ 807 0, /* rightshift */ 808 1, /* size (0 = byte, 1 = short, 2 = long) */ 809 16, /* bitsize */ 810 FALSE, /* pc_relative */ 811 0, /* bitpos */ 812 complain_overflow_dont, /* complain_on_overflow */ 813 bfd_elf_generic_reloc, /* special_function */ 814 "R_BFIN_FUNCDESC_GOTLO", /* name */ 815 FALSE, /* partial_inplace */ 816 0xffff, /* src_mask */ 817 0xffff, /* dst_mask */ 818 FALSE), /* pcrel_offset */ 819 820 /* The 32-bit address of the canonical descriptor of a function. */ 821 HOWTO (R_BFIN_FUNCDESC_VALUE, /* type */ 822 0, /* rightshift */ 823 2, /* size (0 = byte, 1 = short, 2 = long) */ 824 64, /* bitsize */ 825 FALSE, /* pc_relative */ 826 0, /* bitpos */ 827 complain_overflow_bitfield, /* complain_on_overflow */ 828 bfd_elf_generic_reloc, /* special_function */ 829 "R_BFIN_FUNCDESC_VALUE", /* name */ 830 FALSE, /* partial_inplace */ 831 0xffffffff, /* src_mask */ 832 0xffffffff, /* dst_mask */ 833 FALSE), /* pcrel_offset */ 834 835 /* A 12-bit signed operand with the GOT offset for the address of 836 canonical descriptor of a function. */ 837 HOWTO (R_BFIN_FUNCDESC_GOTOFF17M4, /* type */ 838 2, /* rightshift */ 839 1, /* size (0 = byte, 1 = short, 2 = long) */ 840 16, /* bitsize */ 841 FALSE, /* pc_relative */ 842 0, /* bitpos */ 843 complain_overflow_signed, /* complain_on_overflow */ 844 bfd_elf_generic_reloc, /* special_function */ 845 "R_BFIN_FUNCDESC_GOTOFF17M4", /* name */ 846 FALSE, /* partial_inplace */ 847 0xffff, /* src_mask */ 848 0xffff, /* dst_mask */ 849 FALSE), /* pcrel_offset */ 850 851 /* The upper 16 bits of the GOT offset for the address of the 852 canonical descriptor of a function. */ 853 HOWTO (R_BFIN_FUNCDESC_GOTOFFHI, /* type */ 854 0, /* rightshift */ 855 1, /* size (0 = byte, 1 = short, 2 = long) */ 856 16, /* bitsize */ 857 FALSE, /* pc_relative */ 858 0, /* bitpos */ 859 complain_overflow_dont, /* complain_on_overflow */ 860 bfd_elf_generic_reloc, /* special_function */ 861 "R_BFIN_FUNCDESC_GOTOFFHI", /* name */ 862 FALSE, /* partial_inplace */ 863 0xffff, /* src_mask */ 864 0xffff, /* dst_mask */ 865 FALSE), /* pcrel_offset */ 866 867 /* The lower 16 bits of the GOT offset for the address of the 868 canonical descriptor of a function. */ 869 HOWTO (R_BFIN_FUNCDESC_GOTOFFLO, /* type */ 870 0, /* rightshift */ 871 1, /* size (0 = byte, 1 = short, 2 = long) */ 872 16, /* bitsize */ 873 FALSE, /* pc_relative */ 874 0, /* bitpos */ 875 complain_overflow_dont, /* complain_on_overflow */ 876 bfd_elf_generic_reloc, /* special_function */ 877 "R_BFIN_FUNCDESC_GOTOFFLO", /* name */ 878 FALSE, /* partial_inplace */ 879 0xffff, /* src_mask */ 880 0xffff, /* dst_mask */ 881 FALSE), /* pcrel_offset */ 882 883 /* A 12-bit signed operand with the GOT offset for the address of 884 the symbol. */ 885 HOWTO (R_BFIN_GOTOFF17M4, /* type */ 886 2, /* rightshift */ 887 1, /* size (0 = byte, 1 = short, 2 = long) */ 888 16, /* bitsize */ 889 FALSE, /* pc_relative */ 890 0, /* bitpos */ 891 complain_overflow_signed, /* complain_on_overflow */ 892 bfd_elf_generic_reloc, /* special_function */ 893 "R_BFIN_GOTOFF17M4", /* name */ 894 FALSE, /* partial_inplace */ 895 0xffff, /* src_mask */ 896 0xffff, /* dst_mask */ 897 FALSE), /* pcrel_offset */ 898 899 /* The upper 16 bits of the GOT offset for the address of the 900 symbol. */ 901 HOWTO (R_BFIN_GOTOFFHI, /* type */ 902 0, /* rightshift */ 903 1, /* size (0 = byte, 1 = short, 2 = long) */ 904 16, /* bitsize */ 905 FALSE, /* pc_relative */ 906 0, /* bitpos */ 907 complain_overflow_dont, /* complain_on_overflow */ 908 bfd_elf_generic_reloc, /* special_function */ 909 "R_BFIN_GOTOFFHI", /* name */ 910 FALSE, /* partial_inplace */ 911 0xffff, /* src_mask */ 912 0xffff, /* dst_mask */ 913 FALSE), /* pcrel_offset */ 914 915 /* The lower 16 bits of the GOT offset for the address of the 916 symbol. */ 917 HOWTO (R_BFIN_GOTOFFLO, /* type */ 918 0, /* rightshift */ 919 1, /* size (0 = byte, 1 = short, 2 = long) */ 920 16, /* bitsize */ 921 FALSE, /* pc_relative */ 922 0, /* bitpos */ 923 complain_overflow_dont, /* complain_on_overflow */ 924 bfd_elf_generic_reloc, /* special_function */ 925 "R_BFIN_GOTOFFLO", /* name */ 926 FALSE, /* partial_inplace */ 927 0xffff, /* src_mask */ 928 0xffff, /* dst_mask */ 929 FALSE), /* pcrel_offset */ 930}; 931 932static reloc_howto_type bfin_gnuext_howto_table [] = 933{ 934 HOWTO (R_pltpc, /* type. */ 935 0, /* rightshift. */ 936 1, /* size (0 = byte, 1 = short, 2 = long). */ 937 16, /* bitsize. */ 938 FALSE, /* pc_relative. */ 939 0, /* bitpos. */ 940 complain_overflow_bitfield, /* complain_on_overflow. */ 941 bfin_pltpc_reloc, /* special_function. */ 942 "R_pltpc", /* name. */ 943 FALSE, /* partial_inplace. */ 944 0xffff, /* src_mask. */ 945 0xffff, /* dst_mask. */ 946 FALSE), /* pcrel_offset. */ 947 948 HOWTO (R_got, /* type. */ 949 0, /* rightshift. */ 950 1, /* size (0 = byte, 1 = short, 2 = long). */ 951 16, /* bitsize. */ 952 FALSE, /* pc_relative. */ 953 0, /* bitpos. */ 954 complain_overflow_bitfield, /* complain_on_overflow. */ 955 bfd_elf_generic_reloc, /* special_function. */ 956 "R_got", /* name. */ 957 FALSE, /* partial_inplace. */ 958 0x7fff, /* src_mask. */ 959 0x7fff, /* dst_mask. */ 960 FALSE), /* pcrel_offset. */ 961 962/* GNU extension to record C++ vtable hierarchy. */ 963 HOWTO (R_BFIN_GNU_VTINHERIT, /* type. */ 964 0, /* rightshift. */ 965 2, /* size (0 = byte, 1 = short, 2 = long). */ 966 0, /* bitsize. */ 967 FALSE, /* pc_relative. */ 968 0, /* bitpos. */ 969 complain_overflow_dont, /* complain_on_overflow. */ 970 NULL, /* special_function. */ 971 "R_BFIN_GNU_VTINHERIT", /* name. */ 972 FALSE, /* partial_inplace. */ 973 0, /* src_mask. */ 974 0, /* dst_mask. */ 975 FALSE), /* pcrel_offset. */ 976 977/* GNU extension to record C++ vtable member usage. */ 978 HOWTO (R_BFIN_GNU_VTENTRY, /* type. */ 979 0, /* rightshift. */ 980 2, /* size (0 = byte, 1 = short, 2 = long). */ 981 0, /* bitsize. */ 982 FALSE, /* pc_relative. */ 983 0, /* bitpos. */ 984 complain_overflow_dont, /* complain_on_overflow. */ 985 _bfd_elf_rel_vtable_reloc_fn, /* special_function. */ 986 "R_BFIN_GNU_VTENTRY", /* name. */ 987 FALSE, /* partial_inplace. */ 988 0, /* src_mask. */ 989 0, /* dst_mask. */ 990 FALSE) /* pcrel_offset. */ 991}; 992 993struct bfin_reloc_map 994{ 995 bfd_reloc_code_real_type bfd_reloc_val; 996 unsigned int bfin_reloc_val; 997}; 998 999static const struct bfin_reloc_map bfin_reloc_map [] = 1000{ 1001 { BFD_RELOC_NONE, R_unused0 }, 1002 { BFD_RELOC_BFIN_5_PCREL, R_pcrel5m2 }, 1003 { BFD_RELOC_NONE, R_unused1 }, 1004 { BFD_RELOC_BFIN_10_PCREL, R_pcrel10 }, 1005 { BFD_RELOC_BFIN_12_PCREL_JUMP, R_pcrel12_jump }, 1006 { BFD_RELOC_BFIN_16_IMM, R_rimm16 }, 1007 { BFD_RELOC_BFIN_16_LOW, R_luimm16 }, 1008 { BFD_RELOC_BFIN_16_HIGH, R_huimm16 }, 1009 { BFD_RELOC_BFIN_12_PCREL_JUMP_S, R_pcrel12_jump_s }, 1010 { BFD_RELOC_24_PCREL, R_pcrel24 }, 1011 { BFD_RELOC_24_PCREL, R_pcrel24 }, 1012 { BFD_RELOC_BFIN_24_PCREL_JUMP_L, R_pcrel24_jump_l }, 1013 { BFD_RELOC_NONE, R_unusedb }, 1014 { BFD_RELOC_NONE, R_unusedc }, 1015 { BFD_RELOC_BFIN_24_PCREL_CALL_X, R_pcrel24_call_x }, 1016 { BFD_RELOC_8, R_byte_data }, 1017 { BFD_RELOC_16, R_byte2_data }, 1018 { BFD_RELOC_32, R_byte4_data }, 1019 { BFD_RELOC_BFIN_11_PCREL, R_pcrel11 }, 1020 { BFD_RELOC_BFIN_GOT, R_got }, 1021 { BFD_RELOC_BFIN_PLTPC, R_pltpc }, 1022 1023 { BFD_RELOC_BFIN_GOT17M4, R_BFIN_GOT17M4 }, 1024 { BFD_RELOC_BFIN_GOTHI, R_BFIN_GOTHI }, 1025 { BFD_RELOC_BFIN_GOTLO, R_BFIN_GOTLO }, 1026 { BFD_RELOC_BFIN_FUNCDESC, R_BFIN_FUNCDESC }, 1027 { BFD_RELOC_BFIN_FUNCDESC_GOT17M4, R_BFIN_FUNCDESC_GOT17M4 }, 1028 { BFD_RELOC_BFIN_FUNCDESC_GOTHI, R_BFIN_FUNCDESC_GOTHI }, 1029 { BFD_RELOC_BFIN_FUNCDESC_GOTLO, R_BFIN_FUNCDESC_GOTLO }, 1030 { BFD_RELOC_BFIN_FUNCDESC_VALUE, R_BFIN_FUNCDESC_VALUE }, 1031 { BFD_RELOC_BFIN_FUNCDESC_GOTOFF17M4, R_BFIN_FUNCDESC_GOTOFF17M4 }, 1032 { BFD_RELOC_BFIN_FUNCDESC_GOTOFFHI, R_BFIN_FUNCDESC_GOTOFFHI }, 1033 { BFD_RELOC_BFIN_FUNCDESC_GOTOFFLO, R_BFIN_FUNCDESC_GOTOFFLO }, 1034 { BFD_RELOC_BFIN_GOTOFF17M4, R_BFIN_GOTOFF17M4 }, 1035 { BFD_RELOC_BFIN_GOTOFFHI, R_BFIN_GOTOFFHI }, 1036 { BFD_RELOC_BFIN_GOTOFFLO, R_BFIN_GOTOFFLO }, 1037 1038 { BFD_RELOC_VTABLE_INHERIT, R_BFIN_GNU_VTINHERIT }, 1039 { BFD_RELOC_VTABLE_ENTRY, R_BFIN_GNU_VTENTRY }, 1040}; 1041 1042 1043static void 1044bfin_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, 1045 arelent *cache_ptr, 1046 Elf_Internal_Rela *dst) 1047{ 1048 unsigned int r_type; 1049 1050 r_type = ELF32_R_TYPE (dst->r_info); 1051 1052 if (r_type <= BFIN_RELOC_MAX) 1053 cache_ptr->howto = &bfin_howto_table [r_type]; 1054 1055 else if (r_type >= BFIN_GNUEXT_RELOC_MIN && r_type <= BFIN_GNUEXT_RELOC_MAX) 1056 cache_ptr->howto = &bfin_gnuext_howto_table [r_type - BFIN_GNUEXT_RELOC_MIN]; 1057 1058 else 1059 cache_ptr->howto = (reloc_howto_type *) NULL; 1060 1061} 1062/* Given a BFD reloc type, return the howto. */ 1063static reloc_howto_type * 1064bfin_bfd_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, 1065 bfd_reloc_code_real_type code) 1066{ 1067 unsigned int i; 1068 unsigned int r_type = BFIN_RELOC_MIN; 1069 1070 for (i = sizeof (bfin_reloc_map) / sizeof (bfin_reloc_map[0]); --i;) 1071 if (bfin_reloc_map[i].bfd_reloc_val == code) 1072 r_type = bfin_reloc_map[i].bfin_reloc_val; 1073 1074 if (r_type <= BFIN_RELOC_MAX && r_type > BFIN_RELOC_MIN) 1075 return &bfin_howto_table [r_type]; 1076 1077 else if (r_type >= BFIN_GNUEXT_RELOC_MIN && r_type <= BFIN_GNUEXT_RELOC_MAX) 1078 return &bfin_gnuext_howto_table [r_type - BFIN_GNUEXT_RELOC_MIN]; 1079 1080 return (reloc_howto_type *) NULL; 1081 1082} 1083/* Given a bfin relocation type, return the howto. */ 1084static reloc_howto_type * 1085bfin_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, 1086 unsigned int r_type) 1087{ 1088 if (r_type <= BFIN_RELOC_MAX) 1089 return &bfin_howto_table [r_type]; 1090 1091 else if (r_type >= BFIN_GNUEXT_RELOC_MIN && r_type <= BFIN_GNUEXT_RELOC_MAX) 1092 return &bfin_gnuext_howto_table [r_type - BFIN_GNUEXT_RELOC_MIN]; 1093 1094 return (reloc_howto_type *) NULL; 1095 1096} 1097 1098/* Return TRUE if the name is a local label. 1099 bfin local labels begin with L$. */ 1100static bfd_boolean 1101bfin_is_local_label_name ( 1102 bfd *abfd ATTRIBUTE_UNUSED, 1103 const char *label) 1104{ 1105 if (label[0] == 'L' && label[1] == '$' ) 1106 return TRUE; 1107 1108 return _bfd_elf_is_local_label_name (abfd, label); 1109} 1110 1111extern const bfd_target bfd_elf32_bfinfdpic_vec; 1112#define IS_FDPIC(bfd) ((bfd)->xvec == &bfd_elf32_bfinfdpic_vec) 1113 1114/* An extension of the elf hash table data structure, containing some 1115 additional Blackfin-specific data. */ 1116struct bfinfdpic_elf_link_hash_table 1117{ 1118 struct elf_link_hash_table elf; 1119 1120 /* A pointer to the .got section. */ 1121 asection *sgot; 1122 /* A pointer to the .rel.got section. */ 1123 asection *sgotrel; 1124 /* A pointer to the .rofixup section. */ 1125 asection *sgotfixup; 1126 /* A pointer to the .plt section. */ 1127 asection *splt; 1128 /* A pointer to the .rel.plt section. */ 1129 asection *spltrel; 1130 /* GOT base offset. */ 1131 bfd_vma got0; 1132 /* Location of the first non-lazy PLT entry, i.e., the number of 1133 bytes taken by lazy PLT entries. */ 1134 bfd_vma plt0; 1135 /* A hash table holding information about which symbols were 1136 referenced with which PIC-related relocations. */ 1137 struct htab *relocs_info; 1138}; 1139 1140/* Get the Blackfin ELF linker hash table from a link_info structure. */ 1141 1142#define bfinfdpic_hash_table(info) \ 1143 ((struct bfinfdpic_elf_link_hash_table *) ((info)->hash)) 1144 1145#define bfinfdpic_got_section(info) \ 1146 (bfinfdpic_hash_table (info)->sgot) 1147#define bfinfdpic_gotrel_section(info) \ 1148 (bfinfdpic_hash_table (info)->sgotrel) 1149#define bfinfdpic_gotfixup_section(info) \ 1150 (bfinfdpic_hash_table (info)->sgotfixup) 1151#define bfinfdpic_plt_section(info) \ 1152 (bfinfdpic_hash_table (info)->splt) 1153#define bfinfdpic_pltrel_section(info) \ 1154 (bfinfdpic_hash_table (info)->spltrel) 1155#define bfinfdpic_relocs_info(info) \ 1156 (bfinfdpic_hash_table (info)->relocs_info) 1157#define bfinfdpic_got_initial_offset(info) \ 1158 (bfinfdpic_hash_table (info)->got0) 1159#define bfinfdpic_plt_initial_offset(info) \ 1160 (bfinfdpic_hash_table (info)->plt0) 1161 1162/* Create a Blackfin ELF linker hash table. */ 1163 1164static struct bfd_link_hash_table * 1165bfinfdpic_elf_link_hash_table_create (bfd *abfd) 1166{ 1167 struct bfinfdpic_elf_link_hash_table *ret; 1168 bfd_size_type amt = sizeof (struct bfinfdpic_elf_link_hash_table); 1169 1170 ret = bfd_zalloc (abfd, amt); 1171 if (ret == NULL) 1172 return NULL; 1173 1174 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, 1175 _bfd_elf_link_hash_newfunc, 1176 sizeof (struct elf_link_hash_entry))) 1177 { 1178 free (ret); 1179 return NULL; 1180 } 1181 1182 return &ret->elf.root; 1183} 1184 1185/* Decide whether a reference to a symbol can be resolved locally or 1186 not. If the symbol is protected, we want the local address, but 1187 its function descriptor must be assigned by the dynamic linker. */ 1188#define BFINFDPIC_SYM_LOCAL(INFO, H) \ 1189 (_bfd_elf_symbol_refs_local_p ((H), (INFO), 1) \ 1190 || ! elf_hash_table (INFO)->dynamic_sections_created) 1191#define BFINFDPIC_FUNCDESC_LOCAL(INFO, H) \ 1192 ((H)->dynindx == -1 || ! elf_hash_table (INFO)->dynamic_sections_created) 1193 1194/* This structure collects information on what kind of GOT, PLT or 1195 function descriptors are required by relocations that reference a 1196 certain symbol. */ 1197struct bfinfdpic_relocs_info 1198{ 1199 /* The index of the symbol, as stored in the relocation r_info, if 1200 we have a local symbol; -1 otherwise. */ 1201 long symndx; 1202 union 1203 { 1204 /* The input bfd in which the symbol is defined, if it's a local 1205 symbol. */ 1206 bfd *abfd; 1207 /* If symndx == -1, the hash table entry corresponding to a global 1208 symbol (even if it turns out to bind locally, in which case it 1209 should ideally be replaced with section's symndx + addend). */ 1210 struct elf_link_hash_entry *h; 1211 } d; 1212 /* The addend of the relocation that references the symbol. */ 1213 bfd_vma addend; 1214 1215 /* The fields above are used to identify an entry. The fields below 1216 contain information on how an entry is used and, later on, which 1217 locations it was assigned. */ 1218 /* The following 2 fields record whether the symbol+addend above was 1219 ever referenced with a GOT relocation. The 17M4 suffix indicates a 1220 GOT17M4 relocation; hilo is used for GOTLO/GOTHI pairs. */ 1221 unsigned got17m4:1; 1222 unsigned gothilo:1; 1223 /* Whether a FUNCDESC relocation references symbol+addend. */ 1224 unsigned fd:1; 1225 /* Whether a FUNCDESC_GOT relocation references symbol+addend. */ 1226 unsigned fdgot17m4:1; 1227 unsigned fdgothilo:1; 1228 /* Whether a FUNCDESC_GOTOFF relocation references symbol+addend. */ 1229 unsigned fdgoff17m4:1; 1230 unsigned fdgoffhilo:1; 1231 /* Whether symbol+addend is referenced with GOTOFF17M4, GOTOFFLO or 1232 GOTOFFHI relocations. The addend doesn't really matter, since we 1233 envision that this will only be used to check whether the symbol 1234 is mapped to the same segment as the got. */ 1235 unsigned gotoff:1; 1236 /* Whether symbol+addend is referenced by a LABEL24 relocation. */ 1237 unsigned call:1; 1238 /* Whether symbol+addend is referenced by a 32 or FUNCDESC_VALUE 1239 relocation. */ 1240 unsigned sym:1; 1241 /* Whether we need a PLT entry for a symbol. Should be implied by 1242 something like: 1243 (call && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h)) */ 1244 unsigned plt:1; 1245 /* Whether a function descriptor should be created in this link unit 1246 for symbol+addend. Should be implied by something like: 1247 (plt || fdgotoff17m4 || fdgotofflohi 1248 || ((fd || fdgot17m4 || fdgothilo) 1249 && (symndx != -1 || BFINFDPIC_FUNCDESC_LOCAL (info, d.h)))) */ 1250 unsigned privfd:1; 1251 /* Whether a lazy PLT entry is needed for this symbol+addend. 1252 Should be implied by something like: 1253 (privfd && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h) 1254 && ! (info->flags & DF_BIND_NOW)) */ 1255 unsigned lazyplt:1; 1256 /* Whether we've already emitted GOT relocations and PLT entries as 1257 needed for this symbol. */ 1258 unsigned done:1; 1259 1260 /* The number of R_byte4_data, R_BFIN_FUNCDESC and R_BFIN_FUNCDESC_VALUE 1261 relocations referencing the symbol. */ 1262 unsigned relocs32, relocsfd, relocsfdv; 1263 1264 /* The number of .rofixups entries and dynamic relocations allocated 1265 for this symbol, minus any that might have already been used. */ 1266 unsigned fixups, dynrelocs; 1267 1268 /* The offsets of the GOT entries assigned to symbol+addend, to the 1269 function descriptor's address, and to a function descriptor, 1270 respectively. Should be zero if unassigned. The offsets are 1271 counted from the value that will be assigned to the PIC register, 1272 not from the beginning of the .got section. */ 1273 bfd_signed_vma got_entry, fdgot_entry, fd_entry; 1274 /* The offsets of the PLT entries assigned to symbol+addend, 1275 non-lazy and lazy, respectively. If unassigned, should be 1276 (bfd_vma)-1. */ 1277 bfd_vma plt_entry, lzplt_entry; 1278}; 1279 1280/* Compute a hash with the key fields of an bfinfdpic_relocs_info entry. */ 1281static hashval_t 1282bfinfdpic_relocs_info_hash (const void *entry_) 1283{ 1284 const struct bfinfdpic_relocs_info *entry = entry_; 1285 1286 return (entry->symndx == -1 1287 ? (long) entry->d.h->root.root.hash 1288 : entry->symndx + (long) entry->d.abfd->id * 257) + entry->addend; 1289} 1290 1291/* Test whether the key fields of two bfinfdpic_relocs_info entries are 1292 identical. */ 1293static int 1294bfinfdpic_relocs_info_eq (const void *entry1, const void *entry2) 1295{ 1296 const struct bfinfdpic_relocs_info *e1 = entry1; 1297 const struct bfinfdpic_relocs_info *e2 = entry2; 1298 1299 return e1->symndx == e2->symndx && e1->addend == e2->addend 1300 && (e1->symndx == -1 ? e1->d.h == e2->d.h : e1->d.abfd == e2->d.abfd); 1301} 1302 1303/* Find or create an entry in a hash table HT that matches the key 1304 fields of the given ENTRY. If it's not found, memory for a new 1305 entry is allocated in ABFD's obstack. */ 1306static struct bfinfdpic_relocs_info * 1307bfinfdpic_relocs_info_find (struct htab *ht, 1308 bfd *abfd, 1309 const struct bfinfdpic_relocs_info *entry, 1310 enum insert_option insert) 1311{ 1312 struct bfinfdpic_relocs_info **loc = 1313 (struct bfinfdpic_relocs_info **) htab_find_slot (ht, entry, insert); 1314 1315 if (! loc) 1316 return NULL; 1317 1318 if (*loc) 1319 return *loc; 1320 1321 *loc = bfd_zalloc (abfd, sizeof (**loc)); 1322 1323 if (! *loc) 1324 return *loc; 1325 1326 (*loc)->symndx = entry->symndx; 1327 (*loc)->d = entry->d; 1328 (*loc)->addend = entry->addend; 1329 (*loc)->plt_entry = (bfd_vma)-1; 1330 (*loc)->lzplt_entry = (bfd_vma)-1; 1331 1332 return *loc; 1333} 1334 1335/* Obtain the address of the entry in HT associated with H's symbol + 1336 addend, creating a new entry if none existed. ABFD is only used 1337 for memory allocation purposes. */ 1338inline static struct bfinfdpic_relocs_info * 1339bfinfdpic_relocs_info_for_global (struct htab *ht, 1340 bfd *abfd, 1341 struct elf_link_hash_entry *h, 1342 bfd_vma addend, 1343 enum insert_option insert) 1344{ 1345 struct bfinfdpic_relocs_info entry; 1346 1347 entry.symndx = -1; 1348 entry.d.h = h; 1349 entry.addend = addend; 1350 1351 return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert); 1352} 1353 1354/* Obtain the address of the entry in HT associated with the SYMNDXth 1355 local symbol of the input bfd ABFD, plus the addend, creating a new 1356 entry if none existed. */ 1357inline static struct bfinfdpic_relocs_info * 1358bfinfdpic_relocs_info_for_local (struct htab *ht, 1359 bfd *abfd, 1360 long symndx, 1361 bfd_vma addend, 1362 enum insert_option insert) 1363{ 1364 struct bfinfdpic_relocs_info entry; 1365 1366 entry.symndx = symndx; 1367 entry.d.abfd = abfd; 1368 entry.addend = addend; 1369 1370 return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert); 1371} 1372 1373/* Merge fields set by check_relocs() of two entries that end up being 1374 mapped to the same (presumably global) symbol. */ 1375 1376inline static void 1377bfinfdpic_pic_merge_early_relocs_info (struct bfinfdpic_relocs_info *e2, 1378 struct bfinfdpic_relocs_info const *e1) 1379{ 1380 e2->got17m4 |= e1->got17m4; 1381 e2->gothilo |= e1->gothilo; 1382 e2->fd |= e1->fd; 1383 e2->fdgot17m4 |= e1->fdgot17m4; 1384 e2->fdgothilo |= e1->fdgothilo; 1385 e2->fdgoff17m4 |= e1->fdgoff17m4; 1386 e2->fdgoffhilo |= e1->fdgoffhilo; 1387 e2->gotoff |= e1->gotoff; 1388 e2->call |= e1->call; 1389 e2->sym |= e1->sym; 1390} 1391 1392/* Every block of 65535 lazy PLT entries shares a single call to the 1393 resolver, inserted in the 32768th lazy PLT entry (i.e., entry # 1394 32767, counting from 0). All other lazy PLT entries branch to it 1395 in a single instruction. */ 1396 1397#define LZPLT_RESOLVER_EXTRA 10 1398#define LZPLT_NORMAL_SIZE 6 1399#define LZPLT_ENTRIES 1362 1400 1401#define BFINFDPIC_LZPLT_BLOCK_SIZE ((bfd_vma) LZPLT_NORMAL_SIZE * LZPLT_ENTRIES + LZPLT_RESOLVER_EXTRA) 1402#define BFINFDPIC_LZPLT_RESOLV_LOC (LZPLT_NORMAL_SIZE * LZPLT_ENTRIES / 2) 1403 1404/* Add a dynamic relocation to the SRELOC section. */ 1405 1406inline static bfd_vma 1407_bfinfdpic_add_dyn_reloc (bfd *output_bfd, asection *sreloc, bfd_vma offset, 1408 int reloc_type, long dynindx, bfd_vma addend, 1409 struct bfinfdpic_relocs_info *entry) 1410{ 1411 Elf_Internal_Rela outrel; 1412 bfd_vma reloc_offset; 1413 1414 outrel.r_offset = offset; 1415 outrel.r_info = ELF32_R_INFO (dynindx, reloc_type); 1416 outrel.r_addend = addend; 1417 1418 reloc_offset = sreloc->reloc_count * sizeof (Elf32_External_Rel); 1419 BFD_ASSERT (reloc_offset < sreloc->size); 1420 bfd_elf32_swap_reloc_out (output_bfd, &outrel, 1421 sreloc->contents + reloc_offset); 1422 sreloc->reloc_count++; 1423 1424 /* If the entry's index is zero, this relocation was probably to a 1425 linkonce section that got discarded. We reserved a dynamic 1426 relocation, but it was for another entry than the one we got at 1427 the time of emitting the relocation. Unfortunately there's no 1428 simple way for us to catch this situation, since the relocation 1429 is cleared right before calling relocate_section, at which point 1430 we no longer know what the relocation used to point to. */ 1431 if (entry->symndx) 1432 { 1433 BFD_ASSERT (entry->dynrelocs > 0); 1434 entry->dynrelocs--; 1435 } 1436 1437 return reloc_offset; 1438} 1439 1440/* Add a fixup to the ROFIXUP section. */ 1441 1442static bfd_vma 1443_bfinfdpic_add_rofixup (bfd *output_bfd, asection *rofixup, bfd_vma offset, 1444 struct bfinfdpic_relocs_info *entry) 1445{ 1446 bfd_vma fixup_offset; 1447 1448 if (rofixup->flags & SEC_EXCLUDE) 1449 return -1; 1450 1451 fixup_offset = rofixup->reloc_count * 4; 1452 if (rofixup->contents) 1453 { 1454 BFD_ASSERT (fixup_offset < rofixup->size); 1455 bfd_put_32 (output_bfd, offset, rofixup->contents + fixup_offset); 1456 } 1457 rofixup->reloc_count++; 1458 1459 if (entry && entry->symndx) 1460 { 1461 /* See discussion about symndx == 0 in _bfinfdpic_add_dyn_reloc 1462 above. */ 1463 BFD_ASSERT (entry->fixups > 0); 1464 entry->fixups--; 1465 } 1466 1467 return fixup_offset; 1468} 1469 1470/* Find the segment number in which OSEC, and output section, is 1471 located. */ 1472 1473static unsigned 1474_bfinfdpic_osec_to_segment (bfd *output_bfd, asection *osec) 1475{ 1476 struct elf_segment_map *m; 1477 Elf_Internal_Phdr *p; 1478 1479 /* Find the segment that contains the output_section. */ 1480 for (m = elf_tdata (output_bfd)->segment_map, 1481 p = elf_tdata (output_bfd)->phdr; 1482 m != NULL; 1483 m = m->next, p++) 1484 { 1485 int i; 1486 1487 for (i = m->count - 1; i >= 0; i--) 1488 if (m->sections[i] == osec) 1489 break; 1490 1491 if (i >= 0) 1492 break; 1493 } 1494 1495 return p - elf_tdata (output_bfd)->phdr; 1496} 1497 1498inline static bfd_boolean 1499_bfinfdpic_osec_readonly_p (bfd *output_bfd, asection *osec) 1500{ 1501 unsigned seg = _bfinfdpic_osec_to_segment (output_bfd, osec); 1502 1503 return ! (elf_tdata (output_bfd)->phdr[seg].p_flags & PF_W); 1504} 1505 1506/* Generate relocations for GOT entries, function descriptors, and 1507 code for PLT and lazy PLT entries. */ 1508 1509inline static bfd_boolean 1510_bfinfdpic_emit_got_relocs_plt_entries (struct bfinfdpic_relocs_info *entry, 1511 bfd *output_bfd, 1512 struct bfd_link_info *info, 1513 asection *sec, 1514 Elf_Internal_Sym *sym, 1515 bfd_vma addend) 1516 1517{ 1518 bfd_vma fd_lazy_rel_offset = (bfd_vma)-1; 1519 int dynindx = -1; 1520 1521 if (entry->done) 1522 return TRUE; 1523 entry->done = 1; 1524 1525 if (entry->got_entry || entry->fdgot_entry || entry->fd_entry) 1526 { 1527 /* If the symbol is dynamic, consider it for dynamic 1528 relocations, otherwise decay to section + offset. */ 1529 if (entry->symndx == -1 && entry->d.h->dynindx != -1) 1530 dynindx = entry->d.h->dynindx; 1531 else 1532 { 1533 if (sec->output_section 1534 && ! bfd_is_abs_section (sec->output_section) 1535 && ! bfd_is_und_section (sec->output_section)) 1536 dynindx = elf_section_data (sec->output_section)->dynindx; 1537 else 1538 dynindx = 0; 1539 } 1540 } 1541 1542 /* Generate relocation for GOT entry pointing to the symbol. */ 1543 if (entry->got_entry) 1544 { 1545 int idx = dynindx; 1546 bfd_vma ad = addend; 1547 1548 /* If the symbol is dynamic but binds locally, use 1549 section+offset. */ 1550 if (sec && (entry->symndx != -1 1551 || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) 1552 { 1553 if (entry->symndx == -1) 1554 ad += entry->d.h->root.u.def.value; 1555 else 1556 ad += sym->st_value; 1557 ad += sec->output_offset; 1558 if (sec->output_section && elf_section_data (sec->output_section)) 1559 idx = elf_section_data (sec->output_section)->dynindx; 1560 else 1561 idx = 0; 1562 } 1563 1564 /* If we're linking an executable at a fixed address, we can 1565 omit the dynamic relocation as long as the symbol is local to 1566 this module. */ 1567 if (info->executable && !info->pie 1568 && (entry->symndx != -1 1569 || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) 1570 { 1571 if (sec) 1572 ad += sec->output_section->vma; 1573 if (entry->symndx != -1 1574 || entry->d.h->root.type != bfd_link_hash_undefweak) 1575 _bfinfdpic_add_rofixup (output_bfd, 1576 bfinfdpic_gotfixup_section (info), 1577 bfinfdpic_got_section (info)->output_section 1578 ->vma 1579 + bfinfdpic_got_section (info)->output_offset 1580 + bfinfdpic_got_initial_offset (info) 1581 + entry->got_entry, entry); 1582 } 1583 else 1584 _bfinfdpic_add_dyn_reloc (output_bfd, bfinfdpic_gotrel_section (info), 1585 _bfd_elf_section_offset 1586 (output_bfd, info, 1587 bfinfdpic_got_section (info), 1588 bfinfdpic_got_initial_offset (info) 1589 + entry->got_entry) 1590 + bfinfdpic_got_section (info) 1591 ->output_section->vma 1592 + bfinfdpic_got_section (info)->output_offset, 1593 R_byte4_data, idx, ad, entry); 1594 1595 bfd_put_32 (output_bfd, ad, 1596 bfinfdpic_got_section (info)->contents 1597 + bfinfdpic_got_initial_offset (info) 1598 + entry->got_entry); 1599 } 1600 1601 /* Generate relocation for GOT entry pointing to a canonical 1602 function descriptor. */ 1603 if (entry->fdgot_entry) 1604 { 1605 int reloc, idx; 1606 bfd_vma ad = 0; 1607 1608 if (! (entry->symndx == -1 1609 && entry->d.h->root.type == bfd_link_hash_undefweak 1610 && BFINFDPIC_SYM_LOCAL (info, entry->d.h))) 1611 { 1612 /* If the symbol is dynamic and there may be dynamic symbol 1613 resolution because we are, or are linked with, a shared 1614 library, emit a FUNCDESC relocation such that the dynamic 1615 linker will allocate the function descriptor. If the 1616 symbol needs a non-local function descriptor but binds 1617 locally (e.g., its visibility is protected, emit a 1618 dynamic relocation decayed to section+offset. */ 1619 if (entry->symndx == -1 1620 && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h) 1621 && BFINFDPIC_SYM_LOCAL (info, entry->d.h) 1622 && !(info->executable && !info->pie)) 1623 { 1624 reloc = R_BFIN_FUNCDESC; 1625 idx = elf_section_data (entry->d.h->root.u.def.section 1626 ->output_section)->dynindx; 1627 ad = entry->d.h->root.u.def.section->output_offset 1628 + entry->d.h->root.u.def.value; 1629 } 1630 else if (entry->symndx == -1 1631 && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h)) 1632 { 1633 reloc = R_BFIN_FUNCDESC; 1634 idx = dynindx; 1635 ad = addend; 1636 if (ad) 1637 return FALSE; 1638 } 1639 else 1640 { 1641 /* Otherwise, we know we have a private function descriptor, 1642 so reference it directly. */ 1643 if (elf_hash_table (info)->dynamic_sections_created) 1644 BFD_ASSERT (entry->privfd); 1645 reloc = R_byte4_data; 1646 idx = elf_section_data (bfinfdpic_got_section (info) 1647 ->output_section)->dynindx; 1648 ad = bfinfdpic_got_section (info)->output_offset 1649 + bfinfdpic_got_initial_offset (info) + entry->fd_entry; 1650 } 1651 1652 /* If there is room for dynamic symbol resolution, emit the 1653 dynamic relocation. However, if we're linking an 1654 executable at a fixed location, we won't have emitted a 1655 dynamic symbol entry for the got section, so idx will be 1656 zero, which means we can and should compute the address 1657 of the private descriptor ourselves. */ 1658 if (info->executable && !info->pie 1659 && (entry->symndx != -1 1660 || BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h))) 1661 { 1662 ad += bfinfdpic_got_section (info)->output_section->vma; 1663 _bfinfdpic_add_rofixup (output_bfd, 1664 bfinfdpic_gotfixup_section (info), 1665 bfinfdpic_got_section (info) 1666 ->output_section->vma 1667 + bfinfdpic_got_section (info) 1668 ->output_offset 1669 + bfinfdpic_got_initial_offset (info) 1670 + entry->fdgot_entry, entry); 1671 } 1672 else 1673 _bfinfdpic_add_dyn_reloc (output_bfd, 1674 bfinfdpic_gotrel_section (info), 1675 _bfd_elf_section_offset 1676 (output_bfd, info, 1677 bfinfdpic_got_section (info), 1678 bfinfdpic_got_initial_offset (info) 1679 + entry->fdgot_entry) 1680 + bfinfdpic_got_section (info) 1681 ->output_section->vma 1682 + bfinfdpic_got_section (info) 1683 ->output_offset, 1684 reloc, idx, ad, entry); 1685 } 1686 1687 bfd_put_32 (output_bfd, ad, 1688 bfinfdpic_got_section (info)->contents 1689 + bfinfdpic_got_initial_offset (info) 1690 + entry->fdgot_entry); 1691 } 1692 1693 /* Generate relocation to fill in a private function descriptor in 1694 the GOT. */ 1695 if (entry->fd_entry) 1696 { 1697 int idx = dynindx; 1698 bfd_vma ad = addend; 1699 bfd_vma ofst; 1700 long lowword, highword; 1701 1702 /* If the symbol is dynamic but binds locally, use 1703 section+offset. */ 1704 if (sec && (entry->symndx != -1 1705 || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) 1706 { 1707 if (entry->symndx == -1) 1708 ad += entry->d.h->root.u.def.value; 1709 else 1710 ad += sym->st_value; 1711 ad += sec->output_offset; 1712 if (sec->output_section && elf_section_data (sec->output_section)) 1713 idx = elf_section_data (sec->output_section)->dynindx; 1714 else 1715 idx = 0; 1716 } 1717 1718 /* If we're linking an executable at a fixed address, we can 1719 omit the dynamic relocation as long as the symbol is local to 1720 this module. */ 1721 if (info->executable && !info->pie 1722 && (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) 1723 { 1724 if (sec) 1725 ad += sec->output_section->vma; 1726 ofst = 0; 1727 if (entry->symndx != -1 1728 || entry->d.h->root.type != bfd_link_hash_undefweak) 1729 { 1730 _bfinfdpic_add_rofixup (output_bfd, 1731 bfinfdpic_gotfixup_section (info), 1732 bfinfdpic_got_section (info) 1733 ->output_section->vma 1734 + bfinfdpic_got_section (info) 1735 ->output_offset 1736 + bfinfdpic_got_initial_offset (info) 1737 + entry->fd_entry, entry); 1738 _bfinfdpic_add_rofixup (output_bfd, 1739 bfinfdpic_gotfixup_section (info), 1740 bfinfdpic_got_section (info) 1741 ->output_section->vma 1742 + bfinfdpic_got_section (info) 1743 ->output_offset 1744 + bfinfdpic_got_initial_offset (info) 1745 + entry->fd_entry + 4, entry); 1746 } 1747 } 1748 else 1749 { 1750 ofst 1751 = _bfinfdpic_add_dyn_reloc (output_bfd, 1752 entry->lazyplt 1753 ? bfinfdpic_pltrel_section (info) 1754 : bfinfdpic_gotrel_section (info), 1755 _bfd_elf_section_offset 1756 (output_bfd, info, 1757 bfinfdpic_got_section (info), 1758 bfinfdpic_got_initial_offset (info) 1759 + entry->fd_entry) 1760 + bfinfdpic_got_section (info) 1761 ->output_section->vma 1762 + bfinfdpic_got_section (info) 1763 ->output_offset, 1764 R_BFIN_FUNCDESC_VALUE, idx, ad, entry); 1765 } 1766 1767 /* If we've omitted the dynamic relocation, just emit the fixed 1768 addresses of the symbol and of the local GOT base offset. */ 1769 if (info->executable && !info->pie && sec && sec->output_section) 1770 { 1771 lowword = ad; 1772 highword = bfinfdpic_got_section (info)->output_section->vma 1773 + bfinfdpic_got_section (info)->output_offset 1774 + bfinfdpic_got_initial_offset (info); 1775 } 1776 else if (entry->lazyplt) 1777 { 1778 if (ad) 1779 return FALSE; 1780 1781 fd_lazy_rel_offset = ofst; 1782 1783 /* A function descriptor used for lazy or local resolving is 1784 initialized such that its high word contains the output 1785 section index in which the PLT entries are located, and 1786 the low word contains the address of the lazy PLT entry 1787 entry point, that must be within the memory region 1788 assigned to that section. */ 1789 lowword = entry->lzplt_entry + 4 1790 + bfinfdpic_plt_section (info)->output_offset 1791 + bfinfdpic_plt_section (info)->output_section->vma; 1792 highword = _bfinfdpic_osec_to_segment 1793 (output_bfd, bfinfdpic_plt_section (info)->output_section); 1794 } 1795 else 1796 { 1797 /* A function descriptor for a local function gets the index 1798 of the section. For a non-local function, it's 1799 disregarded. */ 1800 lowword = ad; 1801 if (entry->symndx == -1 && entry->d.h->dynindx != -1 1802 && entry->d.h->dynindx == idx) 1803 highword = 0; 1804 else 1805 highword = _bfinfdpic_osec_to_segment 1806 (output_bfd, sec->output_section); 1807 } 1808 1809 bfd_put_32 (output_bfd, lowword, 1810 bfinfdpic_got_section (info)->contents 1811 + bfinfdpic_got_initial_offset (info) 1812 + entry->fd_entry); 1813 bfd_put_32 (output_bfd, highword, 1814 bfinfdpic_got_section (info)->contents 1815 + bfinfdpic_got_initial_offset (info) 1816 + entry->fd_entry + 4); 1817 } 1818 1819 /* Generate code for the PLT entry. */ 1820 if (entry->plt_entry != (bfd_vma) -1) 1821 { 1822 bfd_byte *plt_code = bfinfdpic_plt_section (info)->contents 1823 + entry->plt_entry; 1824 1825 BFD_ASSERT (entry->fd_entry); 1826 1827 /* Figure out what kind of PLT entry we need, depending on the 1828 location of the function descriptor within the GOT. */ 1829 if (entry->fd_entry >= -(1 << (18 - 1)) 1830 && entry->fd_entry + 4 < (1 << (18 - 1))) 1831 { 1832 /* P1 = [P3 + fd_entry]; P3 = [P3 + fd_entry + 4] */ 1833 bfd_put_32 (output_bfd, 1834 0xe519 | ((entry->fd_entry << 14) & 0xFFFF0000), 1835 plt_code); 1836 bfd_put_32 (output_bfd, 1837 0xe51b | (((entry->fd_entry + 4) << 14) & 0xFFFF0000), 1838 plt_code + 4); 1839 plt_code += 8; 1840 } 1841 else 1842 { 1843 /* P1.L = fd_entry; P1.H = fd_entry; 1844 P3 = P3 + P1; 1845 P1 = [P3]; 1846 P3 = [P3 + 4]; */ 1847 bfd_put_32 (output_bfd, 1848 0xe109 | (entry->fd_entry << 16), 1849 plt_code); 1850 bfd_put_32 (output_bfd, 1851 0xe149 | (entry->fd_entry & 0xFFFF0000), 1852 plt_code + 4); 1853 bfd_put_16 (output_bfd, 0x5ad9, plt_code + 8); 1854 bfd_put_16 (output_bfd, 0x9159, plt_code + 10); 1855 bfd_put_16 (output_bfd, 0xac5b, plt_code + 12); 1856 plt_code += 14; 1857 } 1858 /* JUMP (P1) */ 1859 bfd_put_16 (output_bfd, 0x0051, plt_code); 1860 } 1861 1862 /* Generate code for the lazy PLT entry. */ 1863 if (entry->lzplt_entry != (bfd_vma) -1) 1864 { 1865 bfd_byte *lzplt_code = bfinfdpic_plt_section (info)->contents 1866 + entry->lzplt_entry; 1867 bfd_vma resolverStub_addr; 1868 1869 bfd_put_32 (output_bfd, fd_lazy_rel_offset, lzplt_code); 1870 lzplt_code += 4; 1871 1872 resolverStub_addr = entry->lzplt_entry / BFINFDPIC_LZPLT_BLOCK_SIZE 1873 * BFINFDPIC_LZPLT_BLOCK_SIZE + BFINFDPIC_LZPLT_RESOLV_LOC; 1874 if (resolverStub_addr >= bfinfdpic_plt_initial_offset (info)) 1875 resolverStub_addr = bfinfdpic_plt_initial_offset (info) - LZPLT_NORMAL_SIZE - LZPLT_RESOLVER_EXTRA; 1876 1877 if (entry->lzplt_entry == resolverStub_addr) 1878 { 1879 /* This is a lazy PLT entry that includes a resolver call. 1880 P2 = [P3]; 1881 R3 = [P3 + 4]; 1882 JUMP (P2); */ 1883 bfd_put_32 (output_bfd, 1884 0xa05b915a, 1885 lzplt_code); 1886 bfd_put_16 (output_bfd, 0x0052, lzplt_code + 4); 1887 } 1888 else 1889 { 1890 /* JUMP.S resolverStub */ 1891 bfd_put_16 (output_bfd, 1892 0x2000 1893 | (((resolverStub_addr - entry->lzplt_entry) 1894 / 2) & (((bfd_vma)1 << 12) - 1)), 1895 lzplt_code); 1896 } 1897 } 1898 1899 return TRUE; 1900} 1901 1902 1903/* Look through the relocs for a section during the first phase, and 1904 allocate space in the global offset table or procedure linkage 1905 table. */ 1906 1907static bfd_boolean 1908bfin_check_relocs (bfd * abfd, 1909 struct bfd_link_info *info, 1910 asection *sec, 1911 const Elf_Internal_Rela *relocs) 1912{ 1913 bfd *dynobj; 1914 Elf_Internal_Shdr *symtab_hdr; 1915 struct elf_link_hash_entry **sym_hashes; 1916 bfd_signed_vma *local_got_refcounts; 1917 const Elf_Internal_Rela *rel; 1918 const Elf_Internal_Rela *rel_end; 1919 asection *sgot; 1920 asection *srelgot; 1921 asection *sreloc; 1922 if (info->relocatable) 1923 return TRUE; 1924 1925 dynobj = elf_hash_table (info)->dynobj; 1926 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1927 sym_hashes = elf_sym_hashes (abfd); 1928 local_got_refcounts = elf_local_got_refcounts (abfd); 1929 1930 sgot = NULL; 1931 srelgot = NULL; 1932 sreloc = NULL; 1933 1934 rel_end = relocs + sec->reloc_count; 1935 for (rel = relocs; rel < rel_end; rel++) 1936 { 1937 unsigned long r_symndx; 1938 struct elf_link_hash_entry *h; 1939 1940 r_symndx = ELF32_R_SYM (rel->r_info); 1941 if (r_symndx < symtab_hdr->sh_info) 1942 h = NULL; 1943 else 1944 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1945 1946 switch (ELF32_R_TYPE (rel->r_info)) 1947 { 1948 /* This relocation describes the C++ object vtable hierarchy. 1949 Reconstruct it for later use during GC. */ 1950 case R_BFIN_GNU_VTINHERIT: 1951 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1952 return FALSE; 1953 break; 1954 1955 /* This relocation describes which C++ vtable entries 1956 are actually used. Record for later use during GC. */ 1957 case R_BFIN_GNU_VTENTRY: 1958 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1959 return FALSE; 1960 break; 1961 1962 case R_got: 1963 if (h != NULL 1964 && strcmp (h->root.root.string, "__GLOBAL_OFFSET_TABLE_") == 0) 1965 break; 1966 /* Fall through. */ 1967 1968 if (dynobj == NULL) 1969 { 1970 /* Create the .got section. */ 1971 elf_hash_table (info)->dynobj = dynobj = abfd; 1972 if (!_bfd_elf_create_got_section (dynobj, info)) 1973 return FALSE; 1974 } 1975 1976 if (sgot == NULL) 1977 { 1978 sgot = bfd_get_section_by_name (dynobj, ".got"); 1979 BFD_ASSERT (sgot != NULL); 1980 } 1981 1982 if (srelgot == NULL && (h != NULL || info->shared)) 1983 { 1984 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 1985 if (srelgot == NULL) 1986 { 1987 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS 1988 | SEC_IN_MEMORY | SEC_LINKER_CREATED 1989 | SEC_READONLY); 1990 srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", 1991 flags); 1992 if (srelgot == NULL 1993 || !bfd_set_section_alignment (dynobj, srelgot, 2)) 1994 return FALSE; 1995 } 1996 } 1997 1998 if (h != NULL) 1999 { 2000 if (h->got.refcount == 0) 2001 { 2002 /* Make sure this symbol is output as a dynamic symbol. */ 2003 if (h->dynindx == -1 && !h->forced_local) 2004 { 2005 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 2006 return FALSE; 2007 } 2008 2009 /* Allocate space in the .got section. */ 2010 sgot->size += 4; 2011 /* Allocate relocation space. */ 2012 srelgot->size += sizeof (Elf32_External_Rela); 2013 } 2014 h->got.refcount++; 2015 } 2016 else 2017 { 2018 /* This is a global offset table entry for a local symbol. */ 2019 if (local_got_refcounts == NULL) 2020 { 2021 bfd_size_type size; 2022 2023 size = symtab_hdr->sh_info; 2024 size *= sizeof (bfd_signed_vma); 2025 local_got_refcounts = ((bfd_signed_vma *) 2026 bfd_zalloc (abfd, size)); 2027 if (local_got_refcounts == NULL) 2028 return FALSE; 2029 elf_local_got_refcounts (abfd) = local_got_refcounts; 2030 } 2031 if (local_got_refcounts[r_symndx] == 0) 2032 { 2033 sgot->size += 4; 2034 if (info->shared) 2035 { 2036 /* If we are generating a shared object, we need to 2037 output a R_68K_RELATIVE reloc so that the dynamic 2038 linker can adjust this GOT entry. */ 2039 srelgot->size += sizeof (Elf32_External_Rela); 2040 } 2041 } 2042 local_got_refcounts[r_symndx]++; 2043 } 2044 break; 2045 2046 default: 2047 break; 2048 } 2049 } 2050 2051 return TRUE; 2052} 2053 2054static enum elf_reloc_type_class 2055elf32_bfin_reloc_type_class (const Elf_Internal_Rela * rela) 2056{ 2057 switch ((int) ELF32_R_TYPE (rela->r_info)) 2058 { 2059 default: 2060 return reloc_class_normal; 2061 } 2062} 2063 2064/* Relocate an Blackfin ELF section. 2065 2066 The RELOCATE_SECTION function is called by the new ELF backend linker 2067 to handle the relocations for a section. 2068 2069 The relocs are always passed as Rela structures; if the section 2070 actually uses Rel structures, the r_addend field will always be 2071 zero. 2072 2073 This function is responsible for adjusting the section contents as 2074 necessary, and (if using Rela relocs and generating a relocatable 2075 output file) adjusting the reloc addend as necessary. 2076 2077 This function does not have to worry about setting the reloc 2078 address or the reloc symbol index. 2079 2080 LOCAL_SYMS is a pointer to the swapped in local symbols. 2081 2082 LOCAL_SECTIONS is an array giving the section in the input file 2083 corresponding to the st_shndx field of each local symbol. 2084 2085 The global hash table entry for the global symbols can be found 2086 via elf_sym_hashes (input_bfd). 2087 2088 When generating relocatable output, this function must handle 2089 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 2090 going to be the section symbol corresponding to the output 2091 section, which means that the addend must be adjusted 2092 accordingly. */ 2093 2094static bfd_boolean 2095bfinfdpic_relocate_section (bfd * output_bfd, 2096 struct bfd_link_info *info, 2097 bfd * input_bfd, 2098 asection * input_section, 2099 bfd_byte * contents, 2100 Elf_Internal_Rela * relocs, 2101 Elf_Internal_Sym * local_syms, 2102 asection ** local_sections) 2103{ 2104 Elf_Internal_Shdr *symtab_hdr; 2105 struct elf_link_hash_entry **sym_hashes; 2106 Elf_Internal_Rela *rel; 2107 Elf_Internal_Rela *relend; 2108 unsigned isec_segment, got_segment, plt_segment, 2109 check_segment[2]; 2110 int silence_segment_error = !(info->shared || info->pie); 2111 2112 if (info->relocatable) 2113 return TRUE; 2114 2115 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 2116 sym_hashes = elf_sym_hashes (input_bfd); 2117 relend = relocs + input_section->reloc_count; 2118 2119 isec_segment = _bfinfdpic_osec_to_segment (output_bfd, 2120 input_section->output_section); 2121 if (IS_FDPIC (output_bfd) && bfinfdpic_got_section (info)) 2122 got_segment = _bfinfdpic_osec_to_segment (output_bfd, 2123 bfinfdpic_got_section (info) 2124 ->output_section); 2125 else 2126 got_segment = -1; 2127 if (IS_FDPIC (output_bfd) && elf_hash_table (info)->dynamic_sections_created) 2128 plt_segment = _bfinfdpic_osec_to_segment (output_bfd, 2129 bfinfdpic_plt_section (info) 2130 ->output_section); 2131 else 2132 plt_segment = -1; 2133 2134 for (rel = relocs; rel < relend; rel ++) 2135 { 2136 reloc_howto_type *howto; 2137 unsigned long r_symndx; 2138 Elf_Internal_Sym *sym; 2139 asection *sec; 2140 struct elf_link_hash_entry *h; 2141 bfd_vma relocation; 2142 bfd_reloc_status_type r; 2143 const char * name = NULL; 2144 int r_type; 2145 asection *osec; 2146 struct bfinfdpic_relocs_info *picrel; 2147 bfd_vma orig_addend = rel->r_addend; 2148 2149 r_type = ELF32_R_TYPE (rel->r_info); 2150 2151 if (r_type == R_BFIN_GNU_VTINHERIT 2152 || r_type == R_BFIN_GNU_VTENTRY) 2153 continue; 2154 2155 /* This is a final link. */ 2156 r_symndx = ELF32_R_SYM (rel->r_info); 2157 howto = bfin_reloc_type_lookup (input_bfd, r_type); 2158 if (howto == NULL) 2159 { 2160 bfd_set_error (bfd_error_bad_value); 2161 return FALSE; 2162 } 2163 2164 h = NULL; 2165 sym = NULL; 2166 sec = NULL; 2167 2168 if (r_symndx < symtab_hdr->sh_info) 2169 { 2170 sym = local_syms + r_symndx; 2171 osec = sec = local_sections [r_symndx]; 2172 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2173 2174 name = bfd_elf_string_from_elf_section 2175 (input_bfd, symtab_hdr->sh_link, sym->st_name); 2176 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; 2177 } 2178 else 2179 { 2180 h = sym_hashes [r_symndx - symtab_hdr->sh_info]; 2181 2182 while (h->root.type == bfd_link_hash_indirect 2183 || h->root.type == bfd_link_hash_warning) 2184 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2185 2186 name = h->root.root.string; 2187 2188 if ((h->root.type == bfd_link_hash_defined 2189 || h->root.type == bfd_link_hash_defweak) 2190 && ! BFINFDPIC_SYM_LOCAL (info, h)) 2191 { 2192 sec = NULL; 2193 relocation = 0; 2194 } 2195 else 2196 if (h->root.type == bfd_link_hash_defined 2197 || h->root.type == bfd_link_hash_defweak) 2198 { 2199 sec = h->root.u.def.section; 2200 relocation = (h->root.u.def.value 2201 + sec->output_section->vma 2202 + sec->output_offset); 2203 } 2204 else if (h->root.type == bfd_link_hash_undefweak) 2205 { 2206 relocation = 0; 2207 } 2208 else if (info->unresolved_syms_in_objects == RM_IGNORE 2209 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 2210 relocation = 0; 2211 else 2212 { 2213 if (! ((*info->callbacks->undefined_symbol) 2214 (info, h->root.root.string, input_bfd, 2215 input_section, rel->r_offset, 2216 (info->unresolved_syms_in_objects == RM_GENERATE_ERROR 2217 || ELF_ST_VISIBILITY (h->other))))) 2218 return FALSE; 2219 relocation = 0; 2220 } 2221 osec = sec; 2222 } 2223 2224 switch (r_type) 2225 { 2226 case R_pcrel24: 2227 case R_pcrel24_jump_l: 2228 case R_byte4_data: 2229 if (! IS_FDPIC (output_bfd)) 2230 goto non_fdpic; 2231 2232 case R_BFIN_GOT17M4: 2233 case R_BFIN_GOTHI: 2234 case R_BFIN_GOTLO: 2235 case R_BFIN_FUNCDESC_GOT17M4: 2236 case R_BFIN_FUNCDESC_GOTHI: 2237 case R_BFIN_FUNCDESC_GOTLO: 2238 case R_BFIN_GOTOFF17M4: 2239 case R_BFIN_GOTOFFHI: 2240 case R_BFIN_GOTOFFLO: 2241 case R_BFIN_FUNCDESC_GOTOFF17M4: 2242 case R_BFIN_FUNCDESC_GOTOFFHI: 2243 case R_BFIN_FUNCDESC_GOTOFFLO: 2244 case R_BFIN_FUNCDESC: 2245 case R_BFIN_FUNCDESC_VALUE: 2246 if (h != NULL) 2247 picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info 2248 (info), input_bfd, h, 2249 orig_addend, INSERT); 2250 else 2251 /* In order to find the entry we created before, we must 2252 use the original addend, not the one that may have been 2253 modified by _bfd_elf_rela_local_sym(). */ 2254 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info 2255 (info), input_bfd, r_symndx, 2256 orig_addend, INSERT); 2257 if (! picrel) 2258 return FALSE; 2259 2260 if (!_bfinfdpic_emit_got_relocs_plt_entries (picrel, output_bfd, info, 2261 osec, sym, 2262 rel->r_addend)) 2263 { 2264 (*_bfd_error_handler) 2265 (_("%B: relocation at `%A+0x%x' references symbol `%s' with nonzero addend"), 2266 input_bfd, input_section, rel->r_offset, name); 2267 return FALSE; 2268 2269 } 2270 2271 break; 2272 2273 default: 2274 non_fdpic: 2275 picrel = NULL; 2276 if (h && ! BFINFDPIC_SYM_LOCAL (info, h)) 2277 { 2278 info->callbacks->warning 2279 (info, _("relocation references symbol not defined in the module"), 2280 name, input_bfd, input_section, rel->r_offset); 2281 return FALSE; 2282 } 2283 break; 2284 } 2285 2286 switch (r_type) 2287 { 2288 case R_pcrel24: 2289 case R_pcrel24_jump_l: 2290 check_segment[0] = isec_segment; 2291 if (! IS_FDPIC (output_bfd)) 2292 check_segment[1] = isec_segment; 2293 else if (picrel->plt) 2294 { 2295 relocation = bfinfdpic_plt_section (info)->output_section->vma 2296 + bfinfdpic_plt_section (info)->output_offset 2297 + picrel->plt_entry; 2298 check_segment[1] = plt_segment; 2299 } 2300 /* We don't want to warn on calls to undefined weak symbols, 2301 as calls to them must be protected by non-NULL tests 2302 anyway, and unprotected calls would invoke undefined 2303 behavior. */ 2304 else if (picrel->symndx == -1 2305 && picrel->d.h->root.type == bfd_link_hash_undefweak) 2306 check_segment[1] = check_segment[0]; 2307 else 2308 check_segment[1] = sec 2309 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section) 2310 : (unsigned)-1; 2311 break; 2312 2313 case R_BFIN_GOT17M4: 2314 case R_BFIN_GOTHI: 2315 case R_BFIN_GOTLO: 2316 relocation = picrel->got_entry; 2317 check_segment[0] = check_segment[1] = got_segment; 2318 break; 2319 2320 case R_BFIN_FUNCDESC_GOT17M4: 2321 case R_BFIN_FUNCDESC_GOTHI: 2322 case R_BFIN_FUNCDESC_GOTLO: 2323 relocation = picrel->fdgot_entry; 2324 check_segment[0] = check_segment[1] = got_segment; 2325 break; 2326 2327 case R_BFIN_GOTOFFHI: 2328 case R_BFIN_GOTOFF17M4: 2329 case R_BFIN_GOTOFFLO: 2330 relocation -= bfinfdpic_got_section (info)->output_section->vma 2331 + bfinfdpic_got_section (info)->output_offset 2332 + bfinfdpic_got_initial_offset (info); 2333 check_segment[0] = got_segment; 2334 check_segment[1] = sec 2335 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section) 2336 : (unsigned)-1; 2337 break; 2338 2339 case R_BFIN_FUNCDESC_GOTOFF17M4: 2340 case R_BFIN_FUNCDESC_GOTOFFHI: 2341 case R_BFIN_FUNCDESC_GOTOFFLO: 2342 relocation = picrel->fd_entry; 2343 check_segment[0] = check_segment[1] = got_segment; 2344 break; 2345 2346 case R_BFIN_FUNCDESC: 2347 { 2348 int dynindx; 2349 bfd_vma addend = rel->r_addend; 2350 2351 if (! (h && h->root.type == bfd_link_hash_undefweak 2352 && BFINFDPIC_SYM_LOCAL (info, h))) 2353 { 2354 /* If the symbol is dynamic and there may be dynamic 2355 symbol resolution because we are or are linked with a 2356 shared library, emit a FUNCDESC relocation such that 2357 the dynamic linker will allocate the function 2358 descriptor. If the symbol needs a non-local function 2359 descriptor but binds locally (e.g., its visibility is 2360 protected, emit a dynamic relocation decayed to 2361 section+offset. */ 2362 if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h) 2363 && BFINFDPIC_SYM_LOCAL (info, h) 2364 && !(info->executable && !info->pie)) 2365 { 2366 dynindx = elf_section_data (h->root.u.def.section 2367 ->output_section)->dynindx; 2368 addend += h->root.u.def.section->output_offset 2369 + h->root.u.def.value; 2370 } 2371 else if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h)) 2372 { 2373 if (addend) 2374 { 2375 info->callbacks->warning 2376 (info, _("R_BFIN_FUNCDESC references dynamic symbol with nonzero addend"), 2377 name, input_bfd, input_section, rel->r_offset); 2378 return FALSE; 2379 } 2380 dynindx = h->dynindx; 2381 } 2382 else 2383 { 2384 /* Otherwise, we know we have a private function 2385 descriptor, so reference it directly. */ 2386 BFD_ASSERT (picrel->privfd); 2387 r_type = R_byte4_data; 2388 dynindx = elf_section_data (bfinfdpic_got_section (info) 2389 ->output_section)->dynindx; 2390 addend = bfinfdpic_got_section (info)->output_offset 2391 + bfinfdpic_got_initial_offset (info) 2392 + picrel->fd_entry; 2393 } 2394 2395 /* If there is room for dynamic symbol resolution, emit 2396 the dynamic relocation. However, if we're linking an 2397 executable at a fixed location, we won't have emitted a 2398 dynamic symbol entry for the got section, so idx will 2399 be zero, which means we can and should compute the 2400 address of the private descriptor ourselves. */ 2401 if (info->executable && !info->pie 2402 && (!h || BFINFDPIC_FUNCDESC_LOCAL (info, h))) 2403 { 2404 addend += bfinfdpic_got_section (info)->output_section->vma; 2405 if ((bfd_get_section_flags (output_bfd, 2406 input_section->output_section) 2407 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) 2408 { 2409 if (_bfinfdpic_osec_readonly_p (output_bfd, 2410 input_section 2411 ->output_section)) 2412 { 2413 info->callbacks->warning 2414 (info, 2415 _("cannot emit fixups in read-only section"), 2416 name, input_bfd, input_section, rel->r_offset); 2417 return FALSE; 2418 } 2419 _bfinfdpic_add_rofixup (output_bfd, 2420 bfinfdpic_gotfixup_section 2421 (info), 2422 _bfd_elf_section_offset 2423 (output_bfd, info, 2424 input_section, rel->r_offset) 2425 + input_section 2426 ->output_section->vma 2427 + input_section->output_offset, 2428 picrel); 2429 } 2430 } 2431 else if ((bfd_get_section_flags (output_bfd, 2432 input_section->output_section) 2433 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) 2434 { 2435 bfd_vma offset; 2436 2437 if (_bfinfdpic_osec_readonly_p (output_bfd, 2438 input_section 2439 ->output_section)) 2440 { 2441 info->callbacks->warning 2442 (info, 2443 _("cannot emit dynamic relocations in read-only section"), 2444 name, input_bfd, input_section, rel->r_offset); 2445 return FALSE; 2446 } 2447 offset = _bfd_elf_section_offset (output_bfd, info, 2448 input_section, rel->r_offset); 2449 /* Only output a reloc for a not deleted entry. */ 2450 if (offset >= (bfd_vma) -2) 2451 _bfinfdpic_add_dyn_reloc (output_bfd, 2452 bfinfdpic_gotrel_section (info), 2453 0, 2454 R_unused0, 2455 dynindx, addend, picrel); 2456 else 2457 _bfinfdpic_add_dyn_reloc (output_bfd, 2458 bfinfdpic_gotrel_section (info), 2459 offset + input_section 2460 ->output_section->vma 2461 + input_section->output_offset, 2462 r_type, 2463 dynindx, addend, picrel); 2464 } 2465 else 2466 addend += bfinfdpic_got_section (info)->output_section->vma; 2467 } 2468 2469 /* We want the addend in-place because dynamic 2470 relocations are REL. Setting relocation to it should 2471 arrange for it to be installed. */ 2472 relocation = addend - rel->r_addend; 2473 } 2474 check_segment[0] = check_segment[1] = got_segment; 2475 break; 2476 2477 case R_byte4_data: 2478 if (! IS_FDPIC (output_bfd)) 2479 { 2480 check_segment[0] = check_segment[1] = -1; 2481 break; 2482 } 2483 /* Fall through. */ 2484 case R_BFIN_FUNCDESC_VALUE: 2485 { 2486 int dynindx; 2487 bfd_vma addend = rel->r_addend; 2488 2489 /* If the symbol is dynamic but binds locally, use 2490 section+offset. */ 2491 if (h && ! BFINFDPIC_SYM_LOCAL (info, h)) 2492 { 2493 if (addend && r_type == R_BFIN_FUNCDESC_VALUE) 2494 { 2495 info->callbacks->warning 2496 (info, _("R_BFIN_FUNCDESC_VALUE references dynamic symbol with nonzero addend"), 2497 name, input_bfd, input_section, rel->r_offset); 2498 return FALSE; 2499 } 2500 dynindx = h->dynindx; 2501 } 2502 else 2503 { 2504 if (h) 2505 addend += h->root.u.def.value; 2506 else 2507 addend += sym->st_value; 2508 if (osec) 2509 addend += osec->output_offset; 2510 if (osec && osec->output_section 2511 && ! bfd_is_abs_section (osec->output_section) 2512 && ! bfd_is_und_section (osec->output_section)) 2513 dynindx = elf_section_data (osec->output_section)->dynindx; 2514 else 2515 dynindx = 0; 2516 } 2517 2518 /* If we're linking an executable at a fixed address, we 2519 can omit the dynamic relocation as long as the symbol 2520 is defined in the current link unit (which is implied 2521 by its output section not being NULL). */ 2522 if (info->executable && !info->pie 2523 && (!h || BFINFDPIC_SYM_LOCAL (info, h))) 2524 { 2525 if (osec) 2526 addend += osec->output_section->vma; 2527 if (IS_FDPIC (input_bfd) 2528 && (bfd_get_section_flags (output_bfd, 2529 input_section->output_section) 2530 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) 2531 { 2532 if (_bfinfdpic_osec_readonly_p (output_bfd, 2533 input_section 2534 ->output_section)) 2535 { 2536 info->callbacks->warning 2537 (info, 2538 _("cannot emit fixups in read-only section"), 2539 name, input_bfd, input_section, rel->r_offset); 2540 return FALSE; 2541 } 2542 if (!h || h->root.type != bfd_link_hash_undefweak) 2543 { 2544 _bfinfdpic_add_rofixup (output_bfd, 2545 bfinfdpic_gotfixup_section 2546 (info), 2547 _bfd_elf_section_offset 2548 (output_bfd, info, 2549 input_section, rel->r_offset) 2550 + input_section 2551 ->output_section->vma 2552 + input_section->output_offset, 2553 picrel); 2554 if (r_type == R_BFIN_FUNCDESC_VALUE) 2555 _bfinfdpic_add_rofixup 2556 (output_bfd, 2557 bfinfdpic_gotfixup_section (info), 2558 _bfd_elf_section_offset 2559 (output_bfd, info, 2560 input_section, rel->r_offset) 2561 + input_section->output_section->vma 2562 + input_section->output_offset + 4, picrel); 2563 } 2564 } 2565 } 2566 else 2567 { 2568 if ((bfd_get_section_flags (output_bfd, 2569 input_section->output_section) 2570 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) 2571 { 2572 if (_bfinfdpic_osec_readonly_p (output_bfd, 2573 input_section 2574 ->output_section)) 2575 { 2576 info->callbacks->warning 2577 (info, 2578 _("cannot emit dynamic relocations in read-only section"), 2579 name, input_bfd, input_section, rel->r_offset); 2580 return FALSE; 2581 } 2582 _bfinfdpic_add_dyn_reloc (output_bfd, 2583 bfinfdpic_gotrel_section (info), 2584 _bfd_elf_section_offset 2585 (output_bfd, info, 2586 input_section, rel->r_offset) 2587 + input_section 2588 ->output_section->vma 2589 + input_section->output_offset, 2590 r_type, dynindx, addend, picrel); 2591 } 2592 else if (osec) 2593 addend += osec->output_section->vma; 2594 /* We want the addend in-place because dynamic 2595 relocations are REL. Setting relocation to it 2596 should arrange for it to be installed. */ 2597 relocation = addend - rel->r_addend; 2598 } 2599 2600 if (r_type == R_BFIN_FUNCDESC_VALUE) 2601 { 2602 /* If we've omitted the dynamic relocation, just emit 2603 the fixed addresses of the symbol and of the local 2604 GOT base offset. */ 2605 if (info->executable && !info->pie 2606 && (!h || BFINFDPIC_SYM_LOCAL (info, h))) 2607 bfd_put_32 (output_bfd, 2608 bfinfdpic_got_section (info)->output_section->vma 2609 + bfinfdpic_got_section (info)->output_offset 2610 + bfinfdpic_got_initial_offset (info), 2611 contents + rel->r_offset + 4); 2612 else 2613 /* A function descriptor used for lazy or local 2614 resolving is initialized such that its high word 2615 contains the output section index in which the 2616 PLT entries are located, and the low word 2617 contains the offset of the lazy PLT entry entry 2618 point into that section. */ 2619 bfd_put_32 (output_bfd, 2620 h && ! BFINFDPIC_SYM_LOCAL (info, h) 2621 ? 0 2622 : _bfinfdpic_osec_to_segment (output_bfd, 2623 sec 2624 ->output_section), 2625 contents + rel->r_offset + 4); 2626 } 2627 } 2628 check_segment[0] = check_segment[1] = got_segment; 2629 break; 2630 2631 default: 2632 check_segment[0] = isec_segment; 2633 check_segment[1] = sec 2634 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section) 2635 : (unsigned)-1; 2636 break; 2637 } 2638 2639 if (check_segment[0] != check_segment[1] && IS_FDPIC (output_bfd)) 2640 { 2641#if 1 /* If you take this out, remove the #error from fdpic-static-6.d 2642 in the ld testsuite. */ 2643 /* This helps catch problems in GCC while we can't do more 2644 than static linking. The idea is to test whether the 2645 input file basename is crt0.o only once. */ 2646 if (silence_segment_error == 1) 2647 silence_segment_error = 2648 (strlen (input_bfd->filename) == 6 2649 && strcmp (input_bfd->filename, "crt0.o") == 0) 2650 || (strlen (input_bfd->filename) > 6 2651 && strcmp (input_bfd->filename 2652 + strlen (input_bfd->filename) - 7, 2653 "/crt0.o") == 0) 2654 ? -1 : 0; 2655#endif 2656 if (!silence_segment_error 2657 /* We don't want duplicate errors for undefined 2658 symbols. */ 2659 && !(picrel && picrel->symndx == -1 2660 && picrel->d.h->root.type == bfd_link_hash_undefined)) 2661 info->callbacks->warning 2662 (info, 2663 (info->shared || info->pie) 2664 ? _("relocations between different segments are not supported") 2665 : _("warning: relocation references a different segment"), 2666 name, input_bfd, input_section, rel->r_offset); 2667 if (!silence_segment_error && (info->shared || info->pie)) 2668 return FALSE; 2669 elf_elfheader (output_bfd)->e_flags |= EF_BFIN_PIC; 2670 } 2671 2672 switch (r_type) 2673 { 2674 case R_BFIN_GOTOFFHI: 2675 /* We need the addend to be applied before we shift the 2676 value right. */ 2677 relocation += rel->r_addend; 2678 /* Fall through. */ 2679 case R_BFIN_GOTHI: 2680 case R_BFIN_FUNCDESC_GOTHI: 2681 case R_BFIN_FUNCDESC_GOTOFFHI: 2682 relocation >>= 16; 2683 /* Fall through. */ 2684 2685 case R_BFIN_GOTLO: 2686 case R_BFIN_FUNCDESC_GOTLO: 2687 case R_BFIN_GOTOFFLO: 2688 case R_BFIN_FUNCDESC_GOTOFFLO: 2689 relocation &= 0xffff; 2690 break; 2691 2692 default: 2693 break; 2694 } 2695 2696 switch (r_type) 2697 { 2698 case R_pcrel24: 2699 case R_pcrel24_jump_l: 2700 if (! IS_FDPIC (output_bfd) || ! picrel->plt) 2701 break; 2702 /* Fall through. */ 2703 2704 /* When referencing a GOT entry, a function descriptor or a 2705 PLT, we don't want the addend to apply to the reference, 2706 but rather to the referenced symbol. The actual entry 2707 will have already been created taking the addend into 2708 account, so cancel it out here. */ 2709 case R_BFIN_GOT17M4: 2710 case R_BFIN_GOTHI: 2711 case R_BFIN_GOTLO: 2712 case R_BFIN_FUNCDESC_GOT17M4: 2713 case R_BFIN_FUNCDESC_GOTHI: 2714 case R_BFIN_FUNCDESC_GOTLO: 2715 case R_BFIN_FUNCDESC_GOTOFF17M4: 2716 case R_BFIN_FUNCDESC_GOTOFFHI: 2717 case R_BFIN_FUNCDESC_GOTOFFLO: 2718 /* Note that we only want GOTOFFHI, not GOTOFFLO or GOTOFF17M4 2719 here, since we do want to apply the addend to the others. 2720 Note that we've applied the addend to GOTOFFHI before we 2721 shifted it right. */ 2722 case R_BFIN_GOTOFFHI: 2723 relocation -= rel->r_addend; 2724 break; 2725 2726 default: 2727 break; 2728 } 2729 2730 if (r_type == R_pcrel24 2731 || r_type == R_pcrel24_jump_l) 2732 { 2733 bfd_vma x; 2734 bfd_vma address = rel->r_offset; 2735 2736 relocation += rel->r_addend; 2737 2738 /* Perform usual pc-relative correction. */ 2739 relocation -= input_section->output_section->vma + input_section->output_offset; 2740 relocation -= address; 2741 2742 /* We are getting reloc_entry->address 2 byte off from 2743 the start of instruction. Assuming absolute postion 2744 of the reloc data. But, following code had been written assuming 2745 reloc address is starting at begining of instruction. 2746 To compensate that I have increased the value of 2747 relocation by 1 (effectively 2) and used the addr -2 instead of addr. */ 2748 2749 relocation += 2; 2750 address -= 2; 2751 2752 relocation >>= 1; 2753 2754 x = bfd_get_16 (input_bfd, contents + address); 2755 x = (x & 0xff00) | ((relocation >> 16) & 0xff); 2756 bfd_put_16 (input_bfd, x, contents + address); 2757 2758 x = bfd_get_16 (input_bfd, contents + address + 2); 2759 x = relocation & 0xFFFF; 2760 bfd_put_16 (input_bfd, x, contents + address + 2); 2761 r = bfd_reloc_ok; 2762 } 2763 else 2764 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 2765 contents, rel->r_offset, 2766 relocation, rel->r_addend); 2767 2768 if (r != bfd_reloc_ok) 2769 { 2770 const char * msg = (const char *) NULL; 2771 2772 switch (r) 2773 { 2774 case bfd_reloc_overflow: 2775 r = info->callbacks->reloc_overflow 2776 (info, (h ? &h->root : NULL), name, howto->name, 2777 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 2778 break; 2779 2780 case bfd_reloc_undefined: 2781 r = info->callbacks->undefined_symbol 2782 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 2783 break; 2784 2785 case bfd_reloc_outofrange: 2786 msg = _("internal error: out of range error"); 2787 break; 2788 2789 case bfd_reloc_notsupported: 2790 msg = _("internal error: unsupported relocation error"); 2791 break; 2792 2793 case bfd_reloc_dangerous: 2794 msg = _("internal error: dangerous relocation"); 2795 break; 2796 2797 default: 2798 msg = _("internal error: unknown error"); 2799 break; 2800 } 2801 2802 if (msg) 2803 r = info->callbacks->warning 2804 (info, msg, name, input_bfd, input_section, rel->r_offset); 2805 2806 if (! r) 2807 return FALSE; 2808 } 2809 } 2810 2811 return TRUE; 2812} 2813 2814static bfd_boolean 2815bfin_relocate_section (bfd * output_bfd, 2816 struct bfd_link_info *info, 2817 bfd * input_bfd, 2818 asection * input_section, 2819 bfd_byte * contents, 2820 Elf_Internal_Rela * relocs, 2821 Elf_Internal_Sym * local_syms, 2822 asection ** local_sections) 2823{ 2824 bfd *dynobj; 2825 Elf_Internal_Shdr *symtab_hdr; 2826 struct elf_link_hash_entry **sym_hashes; 2827 bfd_vma *local_got_offsets; 2828 asection *sgot; 2829 asection *sreloc; 2830 Elf_Internal_Rela *rel; 2831 Elf_Internal_Rela *relend; 2832 int i = 0; 2833 2834 if (info->relocatable) 2835 return TRUE; 2836 2837 dynobj = elf_hash_table (info)->dynobj; 2838 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2839 sym_hashes = elf_sym_hashes (input_bfd); 2840 local_got_offsets = elf_local_got_offsets (input_bfd); 2841 2842 sgot = NULL; 2843 sreloc = NULL; 2844 2845 rel = relocs; 2846 relend = relocs + input_section->reloc_count; 2847 for (; rel < relend; rel++, i++) 2848 { 2849 int r_type; 2850 reloc_howto_type *howto; 2851 unsigned long r_symndx; 2852 struct elf_link_hash_entry *h; 2853 Elf_Internal_Sym *sym; 2854 asection *sec; 2855 bfd_vma relocation = 0; 2856 bfd_boolean unresolved_reloc; 2857 bfd_reloc_status_type r; 2858 bfd_vma address; 2859 2860 r_type = ELF32_R_TYPE (rel->r_info); 2861 if (r_type < 0 || r_type >= 243) 2862 { 2863 bfd_set_error (bfd_error_bad_value); 2864 return FALSE; 2865 } 2866 2867 if (r_type == R_BFIN_GNU_VTENTRY 2868 || r_type == R_BFIN_GNU_VTINHERIT) 2869 continue; 2870 2871 howto = bfin_reloc_type_lookup (input_bfd, r_type); 2872 if (howto == NULL) 2873 { 2874 bfd_set_error (bfd_error_bad_value); 2875 return FALSE; 2876 } 2877 r_symndx = ELF32_R_SYM (rel->r_info); 2878 2879 h = NULL; 2880 sym = NULL; 2881 sec = NULL; 2882 unresolved_reloc = FALSE; 2883 2884 if (r_symndx < symtab_hdr->sh_info) 2885 { 2886 sym = local_syms + r_symndx; 2887 sec = local_sections[r_symndx]; 2888 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2889 } 2890 else 2891 { 2892 bfd_boolean warned; 2893 h = NULL; 2894 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2895 r_symndx, symtab_hdr, sym_hashes, 2896 h, sec, relocation, 2897 unresolved_reloc, warned); 2898 } 2899 2900 address = rel->r_offset; 2901 2902 /* Then, process normally. */ 2903 switch (r_type) 2904 { 2905 case R_BFIN_GNU_VTINHERIT: 2906 case R_BFIN_GNU_VTENTRY: 2907 return bfd_reloc_ok; 2908 2909 case R_got: 2910 /* Relocation is to the address of the entry for this symbol 2911 in the global offset table. */ 2912 if (h != NULL 2913 && strcmp (h->root.root.string, "__GLOBAL_OFFSET_TABLE_") == 0) 2914 goto do_default; 2915 /* Fall through. */ 2916 /* Relocation is the offset of the entry for this symbol in 2917 the global offset table. */ 2918 2919 { 2920 bfd_vma off; 2921 2922 if (sgot == NULL) 2923 { 2924 sgot = bfd_get_section_by_name (dynobj, ".got"); 2925 BFD_ASSERT (sgot != NULL); 2926 } 2927 2928 if (h != NULL) 2929 { 2930 bfd_boolean dyn; 2931 2932 off = h->got.offset; 2933 BFD_ASSERT (off != (bfd_vma) - 1); 2934 dyn = elf_hash_table (info)->dynamic_sections_created; 2935 2936 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2937 || (info->shared 2938 && (info->symbolic 2939 || h->dynindx == -1 2940 || h->forced_local) 2941 && h->def_regular)) 2942 { 2943 /* This is actually a static link, or it is a 2944 -Bsymbolic link and the symbol is defined 2945 locally, or the symbol was forced to be local 2946 because of a version file.. We must initialize 2947 this entry in the global offset table. Since 2948 the offset must always be a multiple of 4, we 2949 use the least significant bit to record whether 2950 we have initialized it already. 2951 2952 When doing a dynamic link, we create a .rela.got 2953 relocation entry to initialize the value. This 2954 is done in the finish_dynamic_symbol routine. */ 2955 if ((off & 1) != 0) 2956 off &= ~1; 2957 else 2958 { 2959 bfd_put_32 (output_bfd, relocation, 2960 sgot->contents + off); 2961 h->got.offset |= 1; 2962 } 2963 } 2964 else 2965 unresolved_reloc = FALSE; 2966 } 2967 else 2968 { 2969 BFD_ASSERT (local_got_offsets != NULL); 2970 off = local_got_offsets[r_symndx]; 2971 BFD_ASSERT (off != (bfd_vma) - 1); 2972 2973 /* The offset must always be a multiple of 4. We use 2974 the least significant bit to record whether we have 2975 already generated the necessary reloc. */ 2976 if ((off & 1) != 0) 2977 off &= ~1; 2978 else 2979 { 2980 bfd_put_32 (output_bfd, relocation, sgot->contents + off); 2981 2982 if (info->shared) 2983 { 2984 asection *s; 2985 Elf_Internal_Rela outrel; 2986 bfd_byte *loc; 2987 2988 s = bfd_get_section_by_name (dynobj, ".rela.got"); 2989 BFD_ASSERT (s != NULL); 2990 2991 outrel.r_offset = (sgot->output_section->vma 2992 + sgot->output_offset + off); 2993 outrel.r_info = 2994 ELF32_R_INFO (0, R_pcrel24); 2995 outrel.r_addend = relocation; 2996 loc = s->contents; 2997 loc += 2998 s->reloc_count++ * sizeof (Elf32_External_Rela); 2999 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 3000 } 3001 3002 local_got_offsets[r_symndx] |= 1; 3003 } 3004 } 3005 3006 relocation = sgot->output_offset + off; 3007 rel->r_addend = 0; 3008 /* bfin : preg = [preg + 17bitdiv4offset] relocation is div by 4. */ 3009 relocation /= 4; 3010 } 3011 goto do_default; 3012 3013 case R_pcrel24: 3014 case R_pcrel24_jump_l: 3015 { 3016 bfd_vma x; 3017 3018 relocation += rel->r_addend; 3019 3020 /* Perform usual pc-relative correction. */ 3021 relocation -= input_section->output_section->vma + input_section->output_offset; 3022 relocation -= address; 3023 3024 /* We are getting reloc_entry->address 2 byte off from 3025 the start of instruction. Assuming absolute postion 3026 of the reloc data. But, following code had been written assuming 3027 reloc address is starting at begining of instruction. 3028 To compensate that I have increased the value of 3029 relocation by 1 (effectively 2) and used the addr -2 instead of addr. */ 3030 3031 relocation += 2; 3032 address -= 2; 3033 3034 relocation >>= 1; 3035 3036 x = bfd_get_16 (input_bfd, contents + address); 3037 x = (x & 0xff00) | ((relocation >> 16) & 0xff); 3038 bfd_put_16 (input_bfd, x, contents + address); 3039 3040 x = bfd_get_16 (input_bfd, contents + address + 2); 3041 x = relocation & 0xFFFF; 3042 bfd_put_16 (input_bfd, x, contents + address + 2); 3043 r = bfd_reloc_ok; 3044 } 3045 break; 3046 3047 default: 3048 do_default: 3049 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3050 contents, address, 3051 relocation, rel->r_addend); 3052 3053 break; 3054 } 3055 3056 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3057 because such sections are not SEC_ALLOC and thus ld.so will 3058 not process them. */ 3059 if (unresolved_reloc 3060 && !((input_section->flags & SEC_DEBUGGING) != 0 && h->def_dynamic)) 3061 { 3062 (*_bfd_error_handler) 3063 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"), 3064 input_bfd, 3065 input_section, (long) rel->r_offset, h->root.root.string); 3066 return FALSE; 3067 } 3068 3069 if (r != bfd_reloc_ok) 3070 { 3071 const char *name; 3072 3073 if (h != NULL) 3074 name = h->root.root.string; 3075 else 3076 { 3077 name = bfd_elf_string_from_elf_section (input_bfd, 3078 symtab_hdr->sh_link, 3079 sym->st_name); 3080 if (name == NULL) 3081 return FALSE; 3082 if (*name == '\0') 3083 name = bfd_section_name (input_bfd, sec); 3084 } 3085 3086 if (r == bfd_reloc_overflow) 3087 { 3088 if (!(info->callbacks->reloc_overflow 3089 (info, (h ? &h->root : NULL), name, howto->name, 3090 (bfd_vma) 0, input_bfd, input_section, rel->r_offset))) 3091 return FALSE; 3092 } 3093 else 3094 { 3095 (*_bfd_error_handler) 3096 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3097 input_bfd, input_section, 3098 (long) rel->r_offset, name, (int) r); 3099 return FALSE; 3100 } 3101 } 3102 } 3103 3104 return TRUE; 3105} 3106 3107static asection * 3108bfin_gc_mark_hook (asection * sec, 3109 struct bfd_link_info *info, 3110 Elf_Internal_Rela * rel, 3111 struct elf_link_hash_entry *h, 3112 Elf_Internal_Sym * sym) 3113{ 3114 if (h != NULL) 3115 switch (ELF32_R_TYPE (rel->r_info)) 3116 { 3117 case R_BFIN_GNU_VTINHERIT: 3118 case R_BFIN_GNU_VTENTRY: 3119 return NULL; 3120 } 3121 3122 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 3123} 3124 3125/* Update the got entry reference counts for the section being removed. */ 3126 3127static bfd_boolean 3128bfin_gc_sweep_hook (bfd * abfd, 3129 struct bfd_link_info *info, 3130 asection * sec, 3131 const Elf_Internal_Rela * relocs) 3132{ 3133 Elf_Internal_Shdr *symtab_hdr; 3134 struct elf_link_hash_entry **sym_hashes; 3135 bfd_signed_vma *local_got_refcounts; 3136 const Elf_Internal_Rela *rel, *relend; 3137 bfd *dynobj; 3138 asection *sgot; 3139 asection *srelgot; 3140 3141 dynobj = elf_hash_table (info)->dynobj; 3142 if (dynobj == NULL) 3143 return TRUE; 3144 3145 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 3146 sym_hashes = elf_sym_hashes (abfd); 3147 local_got_refcounts = elf_local_got_refcounts (abfd); 3148 3149 sgot = bfd_get_section_by_name (dynobj, ".got"); 3150 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 3151 3152 relend = relocs + sec->reloc_count; 3153 for (rel = relocs; rel < relend; rel++) 3154 { 3155 unsigned long r_symndx; 3156 struct elf_link_hash_entry *h; 3157 3158 switch (ELF32_R_TYPE (rel->r_info)) 3159 { 3160 case R_got: 3161 r_symndx = ELF32_R_SYM (rel->r_info); 3162 if (r_symndx >= symtab_hdr->sh_info) 3163 { 3164 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 3165 if (h->got.refcount > 0) 3166 { 3167 --h->got.refcount; 3168 if (h->got.refcount == 0) 3169 { 3170 /* We don't need the .got entry any more. */ 3171 sgot->size -= 4; 3172 srelgot->size -= sizeof (Elf32_External_Rela); 3173 } 3174 } 3175 } 3176 else if (local_got_refcounts != NULL) 3177 { 3178 if (local_got_refcounts[r_symndx] > 0) 3179 { 3180 --local_got_refcounts[r_symndx]; 3181 if (local_got_refcounts[r_symndx] == 0) 3182 { 3183 /* We don't need the .got entry any more. */ 3184 sgot->size -= 4; 3185 if (info->shared) 3186 srelgot->size -= sizeof (Elf32_External_Rela); 3187 } 3188 } 3189 } 3190 break; 3191 default: 3192 break; 3193 } 3194 } 3195 return TRUE; 3196} 3197 3198/* We need dynamic symbols for every section, since segments can 3199 relocate independently. */ 3200static bfd_boolean 3201_bfinfdpic_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED, 3202 struct bfd_link_info *info 3203 ATTRIBUTE_UNUSED, 3204 asection *p ATTRIBUTE_UNUSED) 3205{ 3206 switch (elf_section_data (p)->this_hdr.sh_type) 3207 { 3208 case SHT_PROGBITS: 3209 case SHT_NOBITS: 3210 /* If sh_type is yet undecided, assume it could be 3211 SHT_PROGBITS/SHT_NOBITS. */ 3212 case SHT_NULL: 3213 return FALSE; 3214 3215 /* There shouldn't be section relative relocations 3216 against any other section. */ 3217 default: 3218 return TRUE; 3219 } 3220} 3221 3222/* Create a .got section, as well as its additional info field. This 3223 is almost entirely copied from 3224 elflink.c:_bfd_elf_create_got_section(). */ 3225 3226static bfd_boolean 3227_bfin_create_got_section (bfd *abfd, struct bfd_link_info *info) 3228{ 3229 flagword flags, pltflags; 3230 asection *s; 3231 struct elf_link_hash_entry *h; 3232 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 3233 int ptralign; 3234 int offset; 3235 3236 /* This function may be called more than once. */ 3237 s = bfd_get_section_by_name (abfd, ".got"); 3238 if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0) 3239 return TRUE; 3240 3241 /* Machine specific: although pointers are 32-bits wide, we want the 3242 GOT to be aligned to a 64-bit boundary, such that function 3243 descriptors in it can be accessed with 64-bit loads and 3244 stores. */ 3245 ptralign = 3; 3246 3247 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 3248 | SEC_LINKER_CREATED); 3249 pltflags = flags; 3250 3251 s = bfd_make_section_with_flags (abfd, ".got", flags); 3252 if (s == NULL 3253 || !bfd_set_section_alignment (abfd, s, ptralign)) 3254 return FALSE; 3255 3256 if (bed->want_got_plt) 3257 { 3258 s = bfd_make_section_with_flags (abfd, ".got.plt", flags); 3259 if (s == NULL 3260 || !bfd_set_section_alignment (abfd, s, ptralign)) 3261 return FALSE; 3262 } 3263 3264 if (bed->want_got_sym) 3265 { 3266 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got 3267 (or .got.plt) section. We don't do this in the linker script 3268 because we don't want to define the symbol if we are not creating 3269 a global offset table. */ 3270 h = _bfd_elf_define_linkage_sym (abfd, info, s, "__GLOBAL_OFFSET_TABLE_"); 3271 elf_hash_table (info)->hgot = h; 3272 if (h == NULL) 3273 return FALSE; 3274 3275 /* Machine-specific: we want the symbol for executables as 3276 well. */ 3277 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3278 return FALSE; 3279 } 3280 3281 /* The first bit of the global offset table is the header. */ 3282 s->size += bed->got_header_size; 3283 3284 /* This is the machine-specific part. Create and initialize section 3285 data for the got. */ 3286 if (IS_FDPIC (abfd)) 3287 { 3288 bfinfdpic_got_section (info) = s; 3289 bfinfdpic_relocs_info (info) = htab_try_create (1, 3290 bfinfdpic_relocs_info_hash, 3291 bfinfdpic_relocs_info_eq, 3292 (htab_del) NULL); 3293 if (! bfinfdpic_relocs_info (info)) 3294 return FALSE; 3295 3296 s = bfd_make_section_with_flags (abfd, ".rel.got", 3297 (flags | SEC_READONLY)); 3298 if (s == NULL 3299 || ! bfd_set_section_alignment (abfd, s, 2)) 3300 return FALSE; 3301 3302 bfinfdpic_gotrel_section (info) = s; 3303 3304 /* Machine-specific. */ 3305 s = bfd_make_section_with_flags (abfd, ".rofixup", 3306 (flags | SEC_READONLY)); 3307 if (s == NULL 3308 || ! bfd_set_section_alignment (abfd, s, 2)) 3309 return FALSE; 3310 3311 bfinfdpic_gotfixup_section (info) = s; 3312 offset = -2048; 3313 flags = BSF_GLOBAL; 3314 } 3315 else 3316 { 3317 offset = 2048; 3318 flags = BSF_GLOBAL | BSF_WEAK; 3319 } 3320 3321 return TRUE; 3322} 3323 3324/* Make sure the got and plt sections exist, and that our pointers in 3325 the link hash table point to them. */ 3326 3327static bfd_boolean 3328elf32_bfinfdpic_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 3329{ 3330 /* This is mostly copied from 3331 elflink.c:_bfd_elf_create_dynamic_sections(). */ 3332 flagword flags, pltflags; 3333 asection *s; 3334 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 3335 3336 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and 3337 .rel[a].bss sections. */ 3338 3339 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 3340 | SEC_LINKER_CREATED); 3341 3342 pltflags = flags; 3343 pltflags |= SEC_CODE; 3344 if (bed->plt_not_loaded) 3345 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS); 3346 if (bed->plt_readonly) 3347 pltflags |= SEC_READONLY; 3348 3349 s = bfd_make_section_with_flags (abfd, ".plt", pltflags); 3350 if (s == NULL 3351 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) 3352 return FALSE; 3353 /* Blackfin-specific: remember it. */ 3354 bfinfdpic_plt_section (info) = s; 3355 3356 if (bed->want_plt_sym) 3357 { 3358 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the 3359 .plt section. */ 3360 struct elf_link_hash_entry *h; 3361 struct bfd_link_hash_entry *bh = NULL; 3362 3363 if (! (_bfd_generic_link_add_one_symbol 3364 (info, abfd, "__PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, 0, NULL, 3365 FALSE, get_elf_backend_data (abfd)->collect, &bh))) 3366 return FALSE; 3367 h = (struct elf_link_hash_entry *) bh; 3368 h->def_regular = 1; 3369 h->type = STT_OBJECT; 3370 3371 if (! info->executable 3372 && ! bfd_elf_link_record_dynamic_symbol (info, h)) 3373 return FALSE; 3374 } 3375 3376 /* Blackfin-specific: we want rel relocations for the plt. */ 3377 s = bfd_make_section_with_flags (abfd, ".rel.plt", flags | SEC_READONLY); 3378 if (s == NULL 3379 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) 3380 return FALSE; 3381 /* Blackfin-specific: remember it. */ 3382 bfinfdpic_pltrel_section (info) = s; 3383 3384 /* Blackfin-specific: we want to create the GOT in the Blackfin way. */ 3385 if (! _bfin_create_got_section (abfd, info)) 3386 return FALSE; 3387 3388 /* Blackfin-specific: make sure we created everything we wanted. */ 3389 BFD_ASSERT (bfinfdpic_got_section (info) && bfinfdpic_gotrel_section (info) 3390 /* && bfinfdpic_gotfixup_section (info) */ 3391 && bfinfdpic_plt_section (info) 3392 && bfinfdpic_pltrel_section (info)); 3393 3394 if (bed->want_dynbss) 3395 { 3396 /* The .dynbss section is a place to put symbols which are defined 3397 by dynamic objects, are referenced by regular objects, and are 3398 not functions. We must allocate space for them in the process 3399 image and use a R_*_COPY reloc to tell the dynamic linker to 3400 initialize them at run time. The linker script puts the .dynbss 3401 section into the .bss section of the final image. */ 3402 s = bfd_make_section_with_flags (abfd, ".dynbss", 3403 SEC_ALLOC | SEC_LINKER_CREATED); 3404 if (s == NULL) 3405 return FALSE; 3406 3407 /* The .rel[a].bss section holds copy relocs. This section is not 3408 normally needed. We need to create it here, though, so that the 3409 linker will map it to an output section. We can't just create it 3410 only if we need it, because we will not know whether we need it 3411 until we have seen all the input files, and the first time the 3412 main linker code calls BFD after examining all the input files 3413 (size_dynamic_sections) the input sections have already been 3414 mapped to the output sections. If the section turns out not to 3415 be needed, we can discard it later. We will never need this 3416 section when generating a shared object, since they do not use 3417 copy relocs. */ 3418 if (! info->shared) 3419 { 3420 s = bfd_make_section_with_flags (abfd, 3421 (bed->default_use_rela_p 3422 ? ".rela.bss" : ".rel.bss"), 3423 flags | SEC_READONLY); 3424 if (s == NULL 3425 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) 3426 return FALSE; 3427 } 3428 } 3429 3430 return TRUE; 3431} 3432 3433/* The name of the dynamic interpreter. This is put in the .interp 3434 section. */ 3435 3436#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" 3437 3438#define DEFAULT_STACK_SIZE 0x20000 3439 3440/* This structure is used to collect the number of entries present in 3441 each addressable range of the got. */ 3442struct _bfinfdpic_dynamic_got_info 3443{ 3444 /* Several bits of information about the current link. */ 3445 struct bfd_link_info *info; 3446 /* Total size needed for GOT entries within the 18- or 32-bit 3447 ranges. */ 3448 bfd_vma got17m4, gothilo; 3449 /* Total size needed for function descriptor entries within the 18- 3450 or 32-bit ranges. */ 3451 bfd_vma fd17m4, fdhilo; 3452 /* Total size needed function descriptor entries referenced in PLT 3453 entries, that would be profitable to place in offsets close to 3454 the PIC register. */ 3455 bfd_vma fdplt; 3456 /* Total size needed by lazy PLT entries. */ 3457 bfd_vma lzplt; 3458 /* Number of relocations carried over from input object files. */ 3459 unsigned long relocs; 3460 /* Number of fixups introduced by relocations in input object files. */ 3461 unsigned long fixups; 3462}; 3463 3464/* Compute the total GOT size required by each symbol in each range. 3465 Symbols may require up to 4 words in the GOT: an entry pointing to 3466 the symbol, an entry pointing to its function descriptor, and a 3467 private function descriptors taking two words. */ 3468 3469static int 3470_bfinfdpic_count_got_plt_entries (void **entryp, void *dinfo_) 3471{ 3472 struct bfinfdpic_relocs_info *entry = *entryp; 3473 struct _bfinfdpic_dynamic_got_info *dinfo = dinfo_; 3474 unsigned relocs = 0, fixups = 0; 3475 3476 /* Allocate space for a GOT entry pointing to the symbol. */ 3477 if (entry->got17m4) 3478 dinfo->got17m4 += 4; 3479 else if (entry->gothilo) 3480 dinfo->gothilo += 4; 3481 else 3482 entry->relocs32--; 3483 entry->relocs32++; 3484 3485 /* Allocate space for a GOT entry pointing to the function 3486 descriptor. */ 3487 if (entry->fdgot17m4) 3488 dinfo->got17m4 += 4; 3489 else if (entry->fdgothilo) 3490 dinfo->gothilo += 4; 3491 else 3492 entry->relocsfd--; 3493 entry->relocsfd++; 3494 3495 /* Decide whether we need a PLT entry, a function descriptor in the 3496 GOT, and a lazy PLT entry for this symbol. */ 3497 entry->plt = entry->call 3498 && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h) 3499 && elf_hash_table (dinfo->info)->dynamic_sections_created; 3500 entry->privfd = entry->plt 3501 || entry->fdgoff17m4 || entry->fdgoffhilo 3502 || ((entry->fd || entry->fdgot17m4 || entry->fdgothilo) 3503 && (entry->symndx != -1 3504 || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h))); 3505 entry->lazyplt = entry->privfd 3506 && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h) 3507 && ! (dinfo->info->flags & DF_BIND_NOW) 3508 && elf_hash_table (dinfo->info)->dynamic_sections_created; 3509 3510 /* Allocate space for a function descriptor. */ 3511 if (entry->fdgoff17m4) 3512 dinfo->fd17m4 += 8; 3513 else if (entry->privfd && entry->plt) 3514 dinfo->fdplt += 8; 3515 else if (entry->privfd) 3516 dinfo->fdhilo += 8; 3517 else 3518 entry->relocsfdv--; 3519 entry->relocsfdv++; 3520 3521 if (entry->lazyplt) 3522 dinfo->lzplt += LZPLT_NORMAL_SIZE; 3523 3524 if (!dinfo->info->executable || dinfo->info->pie) 3525 relocs = entry->relocs32 + entry->relocsfd + entry->relocsfdv; 3526 else 3527 { 3528 if (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h)) 3529 { 3530 if (entry->symndx != -1 3531 || entry->d.h->root.type != bfd_link_hash_undefweak) 3532 fixups += entry->relocs32 + 2 * entry->relocsfdv; 3533 } 3534 else 3535 relocs += entry->relocs32 + entry->relocsfdv; 3536 3537 if (entry->symndx != -1 3538 || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h)) 3539 { 3540 if (entry->symndx != -1 3541 || entry->d.h->root.type != bfd_link_hash_undefweak) 3542 fixups += entry->relocsfd; 3543 } 3544 else 3545 relocs += entry->relocsfd; 3546 } 3547 3548 entry->dynrelocs += relocs; 3549 entry->fixups += fixups; 3550 dinfo->relocs += relocs; 3551 dinfo->fixups += fixups; 3552 3553 return 1; 3554} 3555 3556/* This structure is used to assign offsets to got entries, function 3557 descriptors, plt entries and lazy plt entries. */ 3558 3559struct _bfinfdpic_dynamic_got_plt_info 3560{ 3561 /* Summary information collected with _bfinfdpic_count_got_plt_entries. */ 3562 struct _bfinfdpic_dynamic_got_info g; 3563 3564 /* For each addressable range, we record a MAX (positive) and MIN 3565 (negative) value. CUR is used to assign got entries, and it's 3566 incremented from an initial positive value to MAX, then from MIN 3567 to FDCUR (unless FDCUR wraps around first). FDCUR is used to 3568 assign function descriptors, and it's decreased from an initial 3569 non-positive value to MIN, then from MAX down to CUR (unless CUR 3570 wraps around first). All of MIN, MAX, CUR and FDCUR always point 3571 to even words. ODD, if non-zero, indicates an odd word to be 3572 used for the next got entry, otherwise CUR is used and 3573 incremented by a pair of words, wrapping around when it reaches 3574 MAX. FDCUR is decremented (and wrapped) before the next function 3575 descriptor is chosen. FDPLT indicates the number of remaining 3576 slots that can be used for function descriptors used only by PLT 3577 entries. */ 3578 struct _bfinfdpic_dynamic_got_alloc_data 3579 { 3580 bfd_signed_vma max, cur, odd, fdcur, min; 3581 bfd_vma fdplt; 3582 } got17m4, gothilo; 3583}; 3584 3585/* Determine the positive and negative ranges to be used by each 3586 offset range in the GOT. FDCUR and CUR, that must be aligned to a 3587 double-word boundary, are the minimum (negative) and maximum 3588 (positive) GOT offsets already used by previous ranges, except for 3589 an ODD entry that may have been left behind. GOT and FD indicate 3590 the size of GOT entries and function descriptors that must be 3591 placed within the range from -WRAP to WRAP. If there's room left, 3592 up to FDPLT bytes should be reserved for additional function 3593 descriptors. */ 3594 3595inline static bfd_signed_vma 3596_bfinfdpic_compute_got_alloc_data (struct _bfinfdpic_dynamic_got_alloc_data *gad, 3597 bfd_signed_vma fdcur, 3598 bfd_signed_vma odd, 3599 bfd_signed_vma cur, 3600 bfd_vma got, 3601 bfd_vma fd, 3602 bfd_vma fdplt, 3603 bfd_vma wrap) 3604{ 3605 bfd_signed_vma wrapmin = -wrap; 3606 3607 /* Start at the given initial points. */ 3608 gad->fdcur = fdcur; 3609 gad->cur = cur; 3610 3611 /* If we had an incoming odd word and we have any got entries that 3612 are going to use it, consume it, otherwise leave gad->odd at 3613 zero. We might force gad->odd to zero and return the incoming 3614 odd such that it is used by the next range, but then GOT entries 3615 might appear to be out of order and we wouldn't be able to 3616 shorten the GOT by one word if it turns out to end with an 3617 unpaired GOT entry. */ 3618 if (odd && got) 3619 { 3620 gad->odd = odd; 3621 got -= 4; 3622 odd = 0; 3623 } 3624 else 3625 gad->odd = 0; 3626 3627 /* If we're left with an unpaired GOT entry, compute its location 3628 such that we can return it. Otherwise, if got doesn't require an 3629 odd number of words here, either odd was already zero in the 3630 block above, or it was set to zero because got was non-zero, or 3631 got was already zero. In the latter case, we want the value of 3632 odd to carry over to the return statement, so we don't want to 3633 reset odd unless the condition below is true. */ 3634 if (got & 4) 3635 { 3636 odd = cur + got; 3637 got += 4; 3638 } 3639 3640 /* Compute the tentative boundaries of this range. */ 3641 gad->max = cur + got; 3642 gad->min = fdcur - fd; 3643 gad->fdplt = 0; 3644 3645 /* If function descriptors took too much space, wrap some of them 3646 around. */ 3647 if (gad->min < wrapmin) 3648 { 3649 gad->max += wrapmin - gad->min; 3650 gad->min = wrapmin; 3651 } 3652 /* If there is space left and we have function descriptors 3653 referenced in PLT entries that could take advantage of shorter 3654 offsets, place them here. */ 3655 else if (fdplt && gad->min > wrapmin) 3656 { 3657 bfd_vma fds; 3658 if ((bfd_vma) (gad->min - wrapmin) < fdplt) 3659 fds = gad->min - wrapmin; 3660 else 3661 fds = fdplt; 3662 3663 fdplt -= fds; 3664 gad->min -= fds; 3665 gad->fdplt += fds; 3666 } 3667 3668 /* If GOT entries took too much space, wrap some of them around. 3669 This may well cause gad->min to become lower than wrapmin. This 3670 will cause a relocation overflow later on, so we don't have to 3671 report it here . */ 3672 if ((bfd_vma) gad->max > wrap) 3673 { 3674 gad->min -= gad->max - wrap; 3675 gad->max = wrap; 3676 } 3677 /* If there is more space left, try to place some more function 3678 descriptors for PLT entries. */ 3679 else if (fdplt && (bfd_vma) gad->max < wrap) 3680 { 3681 bfd_vma fds; 3682 if ((bfd_vma) (wrap - gad->max) < fdplt) 3683 fds = wrap - gad->max; 3684 else 3685 fds = fdplt; 3686 3687 fdplt -= fds; 3688 gad->max += fds; 3689 gad->fdplt += fds; 3690 } 3691 3692 /* If odd was initially computed as an offset past the wrap point, 3693 wrap it around. */ 3694 if (odd > gad->max) 3695 odd = gad->min + odd - gad->max; 3696 3697 /* _bfinfdpic_get_got_entry() below will always wrap gad->cur if needed 3698 before returning, so do it here too. This guarantees that, 3699 should cur and fdcur meet at the wrap point, they'll both be 3700 equal to min. */ 3701 if (gad->cur == gad->max) 3702 gad->cur = gad->min; 3703 3704 return odd; 3705} 3706 3707/* Compute the location of the next GOT entry, given the allocation 3708 data for a range. */ 3709 3710inline static bfd_signed_vma 3711_bfinfdpic_get_got_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad) 3712{ 3713 bfd_signed_vma ret; 3714 3715 if (gad->odd) 3716 { 3717 /* If there was an odd word left behind, use it. */ 3718 ret = gad->odd; 3719 gad->odd = 0; 3720 } 3721 else 3722 { 3723 /* Otherwise, use the word pointed to by cur, reserve the next 3724 as an odd word, and skip to the next pair of words, possibly 3725 wrapping around. */ 3726 ret = gad->cur; 3727 gad->odd = gad->cur + 4; 3728 gad->cur += 8; 3729 if (gad->cur == gad->max) 3730 gad->cur = gad->min; 3731 } 3732 3733 return ret; 3734} 3735 3736/* Compute the location of the next function descriptor entry in the 3737 GOT, given the allocation data for a range. */ 3738 3739inline static bfd_signed_vma 3740_bfinfdpic_get_fd_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad) 3741{ 3742 /* If we're at the bottom, wrap around, and only then allocate the 3743 next pair of words. */ 3744 if (gad->fdcur == gad->min) 3745 gad->fdcur = gad->max; 3746 return gad->fdcur -= 8; 3747} 3748 3749/* Assign GOT offsets for every GOT entry and function descriptor. 3750 Doing everything in a single pass is tricky. */ 3751 3752static int 3753_bfinfdpic_assign_got_entries (void **entryp, void *info_) 3754{ 3755 struct bfinfdpic_relocs_info *entry = *entryp; 3756 struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_; 3757 3758 if (entry->got17m4) 3759 entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4); 3760 else if (entry->gothilo) 3761 entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo); 3762 3763 if (entry->fdgot17m4) 3764 entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4); 3765 else if (entry->fdgothilo) 3766 entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo); 3767 3768 if (entry->fdgoff17m4) 3769 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4); 3770 else if (entry->plt && dinfo->got17m4.fdplt) 3771 { 3772 dinfo->got17m4.fdplt -= 8; 3773 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4); 3774 } 3775 else if (entry->plt) 3776 { 3777 dinfo->gothilo.fdplt -= 8; 3778 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo); 3779 } 3780 else if (entry->privfd) 3781 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo); 3782 3783 return 1; 3784} 3785 3786/* Assign GOT offsets to private function descriptors used by PLT 3787 entries (or referenced by 32-bit offsets), as well as PLT entries 3788 and lazy PLT entries. */ 3789 3790static int 3791_bfinfdpic_assign_plt_entries (void **entryp, void *info_) 3792{ 3793 struct bfinfdpic_relocs_info *entry = *entryp; 3794 struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_; 3795 3796 /* If this symbol requires a local function descriptor, allocate 3797 one. */ 3798 if (entry->privfd && entry->fd_entry == 0) 3799 { 3800 if (dinfo->got17m4.fdplt) 3801 { 3802 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4); 3803 dinfo->got17m4.fdplt -= 8; 3804 } 3805 else 3806 { 3807 BFD_ASSERT (dinfo->gothilo.fdplt); 3808 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo); 3809 dinfo->gothilo.fdplt -= 8; 3810 } 3811 } 3812 3813 if (entry->plt) 3814 { 3815 int size; 3816 3817 /* We use the section's raw size to mark the location of the 3818 next PLT entry. */ 3819 entry->plt_entry = bfinfdpic_plt_section (dinfo->g.info)->size; 3820 3821 /* Figure out the length of this PLT entry based on the 3822 addressing mode we need to reach the function descriptor. */ 3823 BFD_ASSERT (entry->fd_entry); 3824 if (entry->fd_entry >= -(1 << (18 - 1)) 3825 && entry->fd_entry + 4 < (1 << (18 - 1))) 3826 size = 10; 3827 else 3828 size = 16; 3829 3830 bfinfdpic_plt_section (dinfo->g.info)->size += size; 3831 } 3832 3833 if (entry->lazyplt) 3834 { 3835 entry->lzplt_entry = dinfo->g.lzplt; 3836 dinfo->g.lzplt += LZPLT_NORMAL_SIZE; 3837 /* If this entry is the one that gets the resolver stub, account 3838 for the additional instruction. */ 3839 if (entry->lzplt_entry % BFINFDPIC_LZPLT_BLOCK_SIZE 3840 == BFINFDPIC_LZPLT_RESOLV_LOC) 3841 dinfo->g.lzplt += LZPLT_RESOLVER_EXTRA; 3842 } 3843 3844 return 1; 3845} 3846 3847/* Follow indirect and warning hash entries so that each got entry 3848 points to the final symbol definition. P must point to a pointer 3849 to the hash table we're traversing. Since this traversal may 3850 modify the hash table, we set this pointer to NULL to indicate 3851 we've made a potentially-destructive change to the hash table, so 3852 the traversal must be restarted. */ 3853static int 3854_bfinfdpic_resolve_final_relocs_info (void **entryp, void *p) 3855{ 3856 struct bfinfdpic_relocs_info *entry = *entryp; 3857 htab_t *htab = p; 3858 3859 if (entry->symndx == -1) 3860 { 3861 struct elf_link_hash_entry *h = entry->d.h; 3862 struct bfinfdpic_relocs_info *oentry; 3863 3864 while (h->root.type == bfd_link_hash_indirect 3865 || h->root.type == bfd_link_hash_warning) 3866 h = (struct elf_link_hash_entry *)h->root.u.i.link; 3867 3868 if (entry->d.h == h) 3869 return 1; 3870 3871 oentry = bfinfdpic_relocs_info_for_global (*htab, 0, h, entry->addend, 3872 NO_INSERT); 3873 3874 if (oentry) 3875 { 3876 /* Merge the two entries. */ 3877 bfinfdpic_pic_merge_early_relocs_info (oentry, entry); 3878 htab_clear_slot (*htab, entryp); 3879 return 1; 3880 } 3881 3882 entry->d.h = h; 3883 3884 /* If we can't find this entry with the new bfd hash, re-insert 3885 it, and get the traversal restarted. */ 3886 if (! htab_find (*htab, entry)) 3887 { 3888 htab_clear_slot (*htab, entryp); 3889 entryp = htab_find_slot (*htab, entry, INSERT); 3890 if (! *entryp) 3891 *entryp = entry; 3892 /* Abort the traversal, since the whole table may have 3893 moved, and leave it up to the parent to restart the 3894 process. */ 3895 *(htab_t *)p = NULL; 3896 return 0; 3897 } 3898 } 3899 3900 return 1; 3901} 3902 3903/* Set the sizes of the dynamic sections. */ 3904 3905static bfd_boolean 3906elf32_bfinfdpic_size_dynamic_sections (bfd *output_bfd, 3907 struct bfd_link_info *info) 3908{ 3909 bfd *dynobj; 3910 asection *s; 3911 struct _bfinfdpic_dynamic_got_plt_info gpinfo; 3912 bfd_signed_vma odd; 3913 bfd_vma limit; 3914 3915 dynobj = elf_hash_table (info)->dynobj; 3916 BFD_ASSERT (dynobj != NULL); 3917 3918 if (elf_hash_table (info)->dynamic_sections_created) 3919 { 3920 /* Set the contents of the .interp section to the interpreter. */ 3921 if (info->executable) 3922 { 3923 s = bfd_get_section_by_name (dynobj, ".interp"); 3924 BFD_ASSERT (s != NULL); 3925 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 3926 s->contents = (bfd_byte *) ELF_DYNAMIC_INTERPRETER; 3927 } 3928 } 3929 3930 memset (&gpinfo, 0, sizeof (gpinfo)); 3931 gpinfo.g.info = info; 3932 3933 for (;;) 3934 { 3935 htab_t relocs = bfinfdpic_relocs_info (info); 3936 3937 htab_traverse (relocs, _bfinfdpic_resolve_final_relocs_info, &relocs); 3938 3939 if (relocs == bfinfdpic_relocs_info (info)) 3940 break; 3941 } 3942 3943 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_count_got_plt_entries, 3944 &gpinfo.g); 3945 3946 odd = 12; 3947 /* Compute the total size taken by entries in the 18-bit range, 3948 to tell how many PLT function descriptors we can bring into it 3949 without causing it to overflow. */ 3950 limit = odd + gpinfo.g.got17m4 + gpinfo.g.fd17m4; 3951 if (limit < (bfd_vma)1 << 18) 3952 limit = ((bfd_vma)1 << 18) - limit; 3953 else 3954 limit = 0; 3955 if (gpinfo.g.fdplt < limit) 3956 limit = gpinfo.g.fdplt; 3957 3958 /* Determine the ranges of GOT offsets that we can use for each 3959 range of addressing modes. */ 3960 odd = _bfinfdpic_compute_got_alloc_data (&gpinfo.got17m4, 3961 0, 3962 odd, 3963 16, 3964 gpinfo.g.got17m4, 3965 gpinfo.g.fd17m4, 3966 limit, 3967 (bfd_vma)1 << (18-1)); 3968 odd = _bfinfdpic_compute_got_alloc_data (&gpinfo.gothilo, 3969 gpinfo.got17m4.min, 3970 odd, 3971 gpinfo.got17m4.max, 3972 gpinfo.g.gothilo, 3973 gpinfo.g.fdhilo, 3974 gpinfo.g.fdplt - gpinfo.got17m4.fdplt, 3975 (bfd_vma)1 << (32-1)); 3976 3977 /* Now assign (most) GOT offsets. */ 3978 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_got_entries, 3979 &gpinfo); 3980 3981 bfinfdpic_got_section (info)->size = gpinfo.gothilo.max 3982 - gpinfo.gothilo.min 3983 /* If an odd word is the last word of the GOT, we don't need this 3984 word to be part of the GOT. */ 3985 - (odd + 4 == gpinfo.gothilo.max ? 4 : 0); 3986 if (bfinfdpic_got_section (info)->size == 0) 3987 bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE; 3988 else if (bfinfdpic_got_section (info)->size == 12 3989 && ! elf_hash_table (info)->dynamic_sections_created) 3990 { 3991 bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE; 3992 bfinfdpic_got_section (info)->size = 0; 3993 } 3994 else 3995 { 3996 bfinfdpic_got_section (info)->contents = 3997 (bfd_byte *) bfd_zalloc (dynobj, 3998 bfinfdpic_got_section (info)->size); 3999 if (bfinfdpic_got_section (info)->contents == NULL) 4000 return FALSE; 4001 } 4002 4003 if (elf_hash_table (info)->dynamic_sections_created) 4004 /* Subtract the number of lzplt entries, since those will generate 4005 relocations in the pltrel section. */ 4006 bfinfdpic_gotrel_section (info)->size = 4007 (gpinfo.g.relocs - gpinfo.g.lzplt / LZPLT_NORMAL_SIZE) 4008 * get_elf_backend_data (output_bfd)->s->sizeof_rel; 4009 else 4010 BFD_ASSERT (gpinfo.g.relocs == 0); 4011 if (bfinfdpic_gotrel_section (info)->size == 0) 4012 bfinfdpic_gotrel_section (info)->flags |= SEC_EXCLUDE; 4013 else 4014 { 4015 bfinfdpic_gotrel_section (info)->contents = 4016 (bfd_byte *) bfd_zalloc (dynobj, 4017 bfinfdpic_gotrel_section (info)->size); 4018 if (bfinfdpic_gotrel_section (info)->contents == NULL) 4019 return FALSE; 4020 } 4021 4022 bfinfdpic_gotfixup_section (info)->size = (gpinfo.g.fixups + 1) * 4; 4023 if (bfinfdpic_gotfixup_section (info)->size == 0) 4024 bfinfdpic_gotfixup_section (info)->flags |= SEC_EXCLUDE; 4025 else 4026 { 4027 bfinfdpic_gotfixup_section (info)->contents = 4028 (bfd_byte *) bfd_zalloc (dynobj, 4029 bfinfdpic_gotfixup_section (info)->size); 4030 if (bfinfdpic_gotfixup_section (info)->contents == NULL) 4031 return FALSE; 4032 } 4033 4034 if (elf_hash_table (info)->dynamic_sections_created) 4035 { 4036 bfinfdpic_pltrel_section (info)->size = 4037 gpinfo.g.lzplt / LZPLT_NORMAL_SIZE * get_elf_backend_data (output_bfd)->s->sizeof_rel; 4038 if (bfinfdpic_pltrel_section (info)->size == 0) 4039 bfinfdpic_pltrel_section (info)->flags |= SEC_EXCLUDE; 4040 else 4041 { 4042 bfinfdpic_pltrel_section (info)->contents = 4043 (bfd_byte *) bfd_zalloc (dynobj, 4044 bfinfdpic_pltrel_section (info)->size); 4045 if (bfinfdpic_pltrel_section (info)->contents == NULL) 4046 return FALSE; 4047 } 4048 } 4049 4050 /* Add 4 bytes for every block of at most 65535 lazy PLT entries, 4051 such that there's room for the additional instruction needed to 4052 call the resolver. Since _bfinfdpic_assign_got_entries didn't 4053 account for them, our block size is 4 bytes smaller than the real 4054 block size. */ 4055 if (elf_hash_table (info)->dynamic_sections_created) 4056 { 4057 bfinfdpic_plt_section (info)->size = gpinfo.g.lzplt 4058 + ((gpinfo.g.lzplt + (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) - LZPLT_NORMAL_SIZE) 4059 / (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) * LZPLT_RESOLVER_EXTRA); 4060 } 4061 4062 /* Reset it, such that _bfinfdpic_assign_plt_entries() can use it to 4063 actually assign lazy PLT entries addresses. */ 4064 gpinfo.g.lzplt = 0; 4065 4066 /* Save information that we're going to need to generate GOT and PLT 4067 entries. */ 4068 bfinfdpic_got_initial_offset (info) = -gpinfo.gothilo.min; 4069 4070 if (get_elf_backend_data (output_bfd)->want_got_sym) 4071 elf_hash_table (info)->hgot->root.u.def.value 4072 += bfinfdpic_got_initial_offset (info); 4073 4074 if (elf_hash_table (info)->dynamic_sections_created) 4075 bfinfdpic_plt_initial_offset (info) = 4076 bfinfdpic_plt_section (info)->size; 4077 4078 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_plt_entries, 4079 &gpinfo); 4080 4081 /* Allocate the PLT section contents only after 4082 _bfinfdpic_assign_plt_entries has a chance to add the size of the 4083 non-lazy PLT entries. */ 4084 if (elf_hash_table (info)->dynamic_sections_created) 4085 { 4086 if (bfinfdpic_plt_section (info)->size == 0) 4087 bfinfdpic_plt_section (info)->flags |= SEC_EXCLUDE; 4088 else 4089 { 4090 bfinfdpic_plt_section (info)->contents = 4091 (bfd_byte *) bfd_zalloc (dynobj, 4092 bfinfdpic_plt_section (info)->size); 4093 if (bfinfdpic_plt_section (info)->contents == NULL) 4094 return FALSE; 4095 } 4096 } 4097 4098 if (elf_hash_table (info)->dynamic_sections_created) 4099 { 4100 if (bfinfdpic_got_section (info)->size) 4101 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0)) 4102 return FALSE; 4103 4104 if (bfinfdpic_pltrel_section (info)->size) 4105 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0) 4106 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_REL) 4107 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0)) 4108 return FALSE; 4109 4110 if (bfinfdpic_gotrel_section (info)->size) 4111 if (!_bfd_elf_add_dynamic_entry (info, DT_REL, 0) 4112 || !_bfd_elf_add_dynamic_entry (info, DT_RELSZ, 0) 4113 || !_bfd_elf_add_dynamic_entry (info, DT_RELENT, 4114 sizeof (Elf32_External_Rel))) 4115 return FALSE; 4116 } 4117 4118 return TRUE; 4119} 4120 4121static bfd_boolean 4122elf32_bfinfdpic_always_size_sections (bfd *output_bfd, 4123 struct bfd_link_info *info) 4124{ 4125 if (!info->relocatable) 4126 { 4127 struct elf_link_hash_entry *h; 4128 4129 /* Force a PT_GNU_STACK segment to be created. */ 4130 if (! elf_tdata (output_bfd)->stack_flags) 4131 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X; 4132 4133 /* Define __stacksize if it's not defined yet. */ 4134 h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize", 4135 FALSE, FALSE, FALSE); 4136 if (! h || h->root.type != bfd_link_hash_defined 4137 || h->type != STT_OBJECT 4138 || !h->def_regular) 4139 { 4140 struct bfd_link_hash_entry *bh = NULL; 4141 4142 if (!(_bfd_generic_link_add_one_symbol 4143 (info, output_bfd, "__stacksize", 4144 BSF_GLOBAL, bfd_abs_section_ptr, DEFAULT_STACK_SIZE, 4145 (const char *) NULL, FALSE, 4146 get_elf_backend_data (output_bfd)->collect, &bh))) 4147 return FALSE; 4148 4149 h = (struct elf_link_hash_entry *) bh; 4150 h->def_regular = 1; 4151 h->type = STT_OBJECT; 4152 } 4153 } 4154 4155 return TRUE; 4156} 4157 4158static bfd_boolean 4159elf32_bfinfdpic_modify_program_headers (bfd *output_bfd, 4160 struct bfd_link_info *info) 4161{ 4162 struct elf_obj_tdata *tdata = elf_tdata (output_bfd); 4163 struct elf_segment_map *m; 4164 Elf_Internal_Phdr *p; 4165 4166 /* objcopy and strip preserve what's already there using 4167 elf32_bfinfdpic_copy_private_bfd_data (). */ 4168 if (! info) 4169 return TRUE; 4170 4171 for (p = tdata->phdr, m = tdata->segment_map; m != NULL; m = m->next, p++) 4172 if (m->p_type == PT_GNU_STACK) 4173 break; 4174 4175 if (m) 4176 { 4177 struct elf_link_hash_entry *h; 4178 4179 /* Obtain the pointer to the __stacksize symbol. */ 4180 h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize", 4181 FALSE, FALSE, FALSE); 4182 if (h) 4183 { 4184 while (h->root.type == bfd_link_hash_indirect 4185 || h->root.type == bfd_link_hash_warning) 4186 h = (struct elf_link_hash_entry *) h->root.u.i.link; 4187 BFD_ASSERT (h->root.type == bfd_link_hash_defined); 4188 } 4189 4190 /* Set the header p_memsz from the symbol value. We 4191 intentionally ignore the symbol section. */ 4192 if (h && h->root.type == bfd_link_hash_defined) 4193 p->p_memsz = h->root.u.def.value; 4194 else 4195 p->p_memsz = DEFAULT_STACK_SIZE; 4196 4197 p->p_align = 8; 4198 } 4199 4200 return TRUE; 4201} 4202 4203static bfd_boolean 4204elf32_bfinfdpic_finish_dynamic_sections (bfd *output_bfd, 4205 struct bfd_link_info *info) 4206{ 4207 bfd *dynobj; 4208 asection *sdyn; 4209 4210 dynobj = elf_hash_table (info)->dynobj; 4211 4212 if (bfinfdpic_got_section (info)) 4213 { 4214 BFD_ASSERT (bfinfdpic_gotrel_section (info)->size 4215 == (bfinfdpic_gotrel_section (info)->reloc_count 4216 * sizeof (Elf32_External_Rel))); 4217 4218 if (bfinfdpic_gotfixup_section (info)) 4219 { 4220 struct elf_link_hash_entry *hgot = elf_hash_table (info)->hgot; 4221 bfd_vma got_value = hgot->root.u.def.value 4222 + hgot->root.u.def.section->output_section->vma 4223 + hgot->root.u.def.section->output_offset; 4224 4225 _bfinfdpic_add_rofixup (output_bfd, bfinfdpic_gotfixup_section (info), 4226 got_value, 0); 4227 4228 if (bfinfdpic_gotfixup_section (info)->size 4229 != (bfinfdpic_gotfixup_section (info)->reloc_count * 4)) 4230 { 4231 (*_bfd_error_handler) 4232 ("LINKER BUG: .rofixup section size mismatch"); 4233 return FALSE; 4234 } 4235 } 4236 } 4237 if (elf_hash_table (info)->dynamic_sections_created) 4238 { 4239 BFD_ASSERT (bfinfdpic_pltrel_section (info)->size 4240 == (bfinfdpic_pltrel_section (info)->reloc_count 4241 * sizeof (Elf32_External_Rel))); 4242 } 4243 4244 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 4245 4246 if (elf_hash_table (info)->dynamic_sections_created) 4247 { 4248 Elf32_External_Dyn * dyncon; 4249 Elf32_External_Dyn * dynconend; 4250 4251 BFD_ASSERT (sdyn != NULL); 4252 4253 dyncon = (Elf32_External_Dyn *) sdyn->contents; 4254 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 4255 4256 for (; dyncon < dynconend; dyncon++) 4257 { 4258 Elf_Internal_Dyn dyn; 4259 4260 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 4261 4262 switch (dyn.d_tag) 4263 { 4264 default: 4265 break; 4266 4267 case DT_PLTGOT: 4268 dyn.d_un.d_ptr = bfinfdpic_got_section (info)->output_section->vma 4269 + bfinfdpic_got_section (info)->output_offset 4270 + bfinfdpic_got_initial_offset (info); 4271 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4272 break; 4273 4274 case DT_JMPREL: 4275 dyn.d_un.d_ptr = bfinfdpic_pltrel_section (info) 4276 ->output_section->vma 4277 + bfinfdpic_pltrel_section (info)->output_offset; 4278 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4279 break; 4280 4281 case DT_PLTRELSZ: 4282 dyn.d_un.d_val = bfinfdpic_pltrel_section (info)->size; 4283 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4284 break; 4285 } 4286 } 4287 } 4288 4289 return TRUE; 4290} 4291 4292/* Adjust a symbol defined by a dynamic object and referenced by a 4293 regular object. */ 4294 4295static bfd_boolean 4296elf32_bfinfdpic_adjust_dynamic_symbol 4297(struct bfd_link_info *info ATTRIBUTE_UNUSED, 4298 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) 4299{ 4300 bfd * dynobj; 4301 4302 dynobj = elf_hash_table (info)->dynobj; 4303 4304 /* Make sure we know what is going on here. */ 4305 BFD_ASSERT (dynobj != NULL 4306 && (h->u.weakdef != NULL 4307 || (h->def_dynamic 4308 && h->ref_regular 4309 && !h->def_regular))); 4310 4311 /* If this is a weak symbol, and there is a real definition, the 4312 processor independent code will have arranged for us to see the 4313 real definition first, and we can just use the same value. */ 4314 if (h->u.weakdef != NULL) 4315 { 4316 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 4317 || h->u.weakdef->root.type == bfd_link_hash_defweak); 4318 h->root.u.def.section = h->u.weakdef->root.u.def.section; 4319 h->root.u.def.value = h->u.weakdef->root.u.def.value; 4320 } 4321 4322 return TRUE; 4323} 4324 4325/* Perform any actions needed for dynamic symbols. */ 4326 4327static bfd_boolean 4328elf32_bfinfdpic_finish_dynamic_symbol 4329(bfd *output_bfd ATTRIBUTE_UNUSED, 4330 struct bfd_link_info *info ATTRIBUTE_UNUSED, 4331 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED, 4332 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED) 4333{ 4334 return TRUE; 4335} 4336 4337/* Decide whether to attempt to turn absptr or lsda encodings in 4338 shared libraries into pcrel within the given input section. */ 4339 4340static bfd_boolean 4341bfinfdpic_elf_use_relative_eh_frame 4342(bfd *input_bfd ATTRIBUTE_UNUSED, 4343 struct bfd_link_info *info ATTRIBUTE_UNUSED, 4344 asection *eh_frame_section ATTRIBUTE_UNUSED) 4345{ 4346 /* We can't use PC-relative encodings in FDPIC binaries, in general. */ 4347 return FALSE; 4348} 4349 4350/* Adjust the contents of an eh_frame_hdr section before they're output. */ 4351 4352static bfd_byte 4353bfinfdpic_elf_encode_eh_address (bfd *abfd, 4354 struct bfd_link_info *info, 4355 asection *osec, bfd_vma offset, 4356 asection *loc_sec, bfd_vma loc_offset, 4357 bfd_vma *encoded) 4358{ 4359 struct elf_link_hash_entry *h; 4360 4361 h = elf_hash_table (info)->hgot; 4362 BFD_ASSERT (h && h->root.type == bfd_link_hash_defined); 4363 4364 if (! h || (_bfinfdpic_osec_to_segment (abfd, osec) 4365 == _bfinfdpic_osec_to_segment (abfd, loc_sec->output_section))) 4366 return _bfd_elf_encode_eh_address (abfd, info, osec, offset, 4367 loc_sec, loc_offset, encoded); 4368 4369 BFD_ASSERT (_bfinfdpic_osec_to_segment (abfd, osec) 4370 == (_bfinfdpic_osec_to_segment 4371 (abfd, h->root.u.def.section->output_section))); 4372 4373 *encoded = osec->vma + offset 4374 - (h->root.u.def.value 4375 + h->root.u.def.section->output_section->vma 4376 + h->root.u.def.section->output_offset); 4377 4378 return DW_EH_PE_datarel | DW_EH_PE_sdata4; 4379} 4380 4381 4382 4383/* Look through the relocs for a section during the first phase. 4384 4385 Besides handling virtual table relocs for gc, we have to deal with 4386 all sorts of PIC-related relocations. We describe below the 4387 general plan on how to handle such relocations, even though we only 4388 collect information at this point, storing them in hash tables for 4389 perusal of later passes. 4390 4391 32 relocations are propagated to the linker output when creating 4392 position-independent output. LO16 and HI16 relocations are not 4393 supposed to be encountered in this case. 4394 4395 LABEL16 should always be resolvable by the linker, since it's only 4396 used by branches. 4397 4398 LABEL24, on the other hand, is used by calls. If it turns out that 4399 the target of a call is a dynamic symbol, a PLT entry must be 4400 created for it, which triggers the creation of a private function 4401 descriptor and, unless lazy binding is disabled, a lazy PLT entry. 4402 4403 GPREL relocations require the referenced symbol to be in the same 4404 segment as _gp, but this can only be checked later. 4405 4406 All GOT, GOTOFF and FUNCDESC relocations require a .got section to 4407 exist. LABEL24 might as well, since it may require a PLT entry, 4408 that will require a got. 4409 4410 Non-FUNCDESC GOT relocations require a GOT entry to be created 4411 regardless of whether the symbol is dynamic. However, since a 4412 global symbol that turns out to not be exported may have the same 4413 address of a non-dynamic symbol, we don't assign GOT entries at 4414 this point, such that we can share them in this case. A relocation 4415 for the GOT entry always has to be created, be it to offset a 4416 private symbol by the section load address, be it to get the symbol 4417 resolved dynamically. 4418 4419 FUNCDESC GOT relocations require a GOT entry to be created, and 4420 handled as if a FUNCDESC relocation was applied to the GOT entry in 4421 an object file. 4422 4423 FUNCDESC relocations referencing a symbol that turns out to NOT be 4424 dynamic cause a private function descriptor to be created. The 4425 FUNCDESC relocation then decays to a 32 relocation that points at 4426 the private descriptor. If the symbol is dynamic, the FUNCDESC 4427 relocation is propagated to the linker output, such that the 4428 dynamic linker creates the canonical descriptor, pointing to the 4429 dynamically-resolved definition of the function. 4430 4431 Non-FUNCDESC GOTOFF relocations must always refer to non-dynamic 4432 symbols that are assigned to the same segment as the GOT, but we 4433 can only check this later, after we know the complete set of 4434 symbols defined and/or exported. 4435 4436 FUNCDESC GOTOFF relocations require a function descriptor to be 4437 created and, unless lazy binding is disabled or the symbol is not 4438 dynamic, a lazy PLT entry. Since we can't tell at this point 4439 whether a symbol is going to be dynamic, we have to decide later 4440 whether to create a lazy PLT entry or bind the descriptor directly 4441 to the private function. 4442 4443 FUNCDESC_VALUE relocations are not supposed to be present in object 4444 files, but they may very well be simply propagated to the linker 4445 output, since they have no side effect. 4446 4447 4448 A function descriptor always requires a FUNCDESC_VALUE relocation. 4449 Whether it's in .plt.rel or not depends on whether lazy binding is 4450 enabled and on whether the referenced symbol is dynamic. 4451 4452 The existence of a lazy PLT requires the resolverStub lazy PLT 4453 entry to be present. 4454 4455 4456 As for assignment of GOT, PLT and lazy PLT entries, and private 4457 descriptors, we might do them all sequentially, but we can do 4458 better than that. For example, we can place GOT entries and 4459 private function descriptors referenced using 12-bit operands 4460 closer to the PIC register value, such that these relocations don't 4461 overflow. Those that are only referenced with LO16 relocations 4462 could come next, but we may as well place PLT-required function 4463 descriptors in the 12-bit range to make them shorter. Symbols 4464 referenced with LO16/HI16 may come next, but we may place 4465 additional function descriptors in the 16-bit range if we can 4466 reliably tell that we've already placed entries that are ever 4467 referenced with only LO16. PLT entries are therefore generated as 4468 small as possible, while not introducing relocation overflows in 4469 GOT or FUNCDESC_GOTOFF relocations. Lazy PLT entries could be 4470 generated before or after PLT entries, but not intermingled with 4471 them, such that we can have more lazy PLT entries in range for a 4472 branch to the resolverStub. The resolverStub should be emitted at 4473 the most distant location from the first lazy PLT entry such that 4474 it's still in range for a branch, or closer, if there isn't a need 4475 for so many lazy PLT entries. Additional lazy PLT entries may be 4476 emitted after the resolverStub, as long as branches are still in 4477 range. If the branch goes out of range, longer lazy PLT entries 4478 are emitted. 4479 4480 We could further optimize PLT and lazy PLT entries by giving them 4481 priority in assignment to closer-to-gr17 locations depending on the 4482 number of occurrences of references to them (assuming a function 4483 that's called more often is more important for performance, so its 4484 PLT entry should be faster), or taking hints from the compiler. 4485 Given infinite time and money... :-) */ 4486 4487static bfd_boolean 4488bfinfdpic_check_relocs (bfd *abfd, struct bfd_link_info *info, 4489 asection *sec, const Elf_Internal_Rela *relocs) 4490{ 4491 Elf_Internal_Shdr *symtab_hdr; 4492 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 4493 const Elf_Internal_Rela *rel; 4494 const Elf_Internal_Rela *rel_end; 4495 bfd *dynobj; 4496 struct bfinfdpic_relocs_info *picrel; 4497 4498 if (info->relocatable) 4499 return TRUE; 4500 4501 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4502 sym_hashes = elf_sym_hashes (abfd); 4503 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym); 4504 if (!elf_bad_symtab (abfd)) 4505 sym_hashes_end -= symtab_hdr->sh_info; 4506 4507 dynobj = elf_hash_table (info)->dynobj; 4508 rel_end = relocs + sec->reloc_count; 4509 for (rel = relocs; rel < rel_end; rel++) 4510 { 4511 struct elf_link_hash_entry *h; 4512 unsigned long r_symndx; 4513 4514 r_symndx = ELF32_R_SYM (rel->r_info); 4515 if (r_symndx < symtab_hdr->sh_info) 4516 h = NULL; 4517 else 4518 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 4519 4520 switch (ELF32_R_TYPE (rel->r_info)) 4521 { 4522 case R_BFIN_GOT17M4: 4523 case R_BFIN_GOTHI: 4524 case R_BFIN_GOTLO: 4525 case R_BFIN_FUNCDESC_GOT17M4: 4526 case R_BFIN_FUNCDESC_GOTHI: 4527 case R_BFIN_FUNCDESC_GOTLO: 4528 case R_BFIN_GOTOFF17M4: 4529 case R_BFIN_GOTOFFHI: 4530 case R_BFIN_GOTOFFLO: 4531 case R_BFIN_FUNCDESC_GOTOFF17M4: 4532 case R_BFIN_FUNCDESC_GOTOFFHI: 4533 case R_BFIN_FUNCDESC_GOTOFFLO: 4534 case R_BFIN_FUNCDESC: 4535 case R_BFIN_FUNCDESC_VALUE: 4536 if (! IS_FDPIC (abfd)) 4537 goto bad_reloc; 4538 /* Fall through. */ 4539 case R_pcrel24: 4540 case R_pcrel24_jump_l: 4541 case R_byte4_data: 4542 if (IS_FDPIC (abfd) && ! dynobj) 4543 { 4544 elf_hash_table (info)->dynobj = dynobj = abfd; 4545 if (! _bfin_create_got_section (abfd, info)) 4546 return FALSE; 4547 } 4548 if (! IS_FDPIC (abfd)) 4549 { 4550 picrel = NULL; 4551 break; 4552 } 4553 if (h != NULL) 4554 { 4555 if (h->dynindx == -1) 4556 switch (ELF_ST_VISIBILITY (h->other)) 4557 { 4558 case STV_INTERNAL: 4559 case STV_HIDDEN: 4560 break; 4561 default: 4562 bfd_elf_link_record_dynamic_symbol (info, h); 4563 break; 4564 } 4565 picrel 4566 = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info), 4567 abfd, h, 4568 rel->r_addend, INSERT); 4569 } 4570 else 4571 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info 4572 (info), abfd, r_symndx, 4573 rel->r_addend, INSERT); 4574 if (! picrel) 4575 return FALSE; 4576 break; 4577 4578 default: 4579 picrel = NULL; 4580 break; 4581 } 4582 4583 switch (ELF32_R_TYPE (rel->r_info)) 4584 { 4585 case R_pcrel24: 4586 case R_pcrel24_jump_l: 4587 if (IS_FDPIC (abfd)) 4588 picrel->call = 1; 4589 break; 4590 4591 case R_BFIN_FUNCDESC_VALUE: 4592 picrel->relocsfdv++; 4593 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) 4594 picrel->relocs32--; 4595 /* Fall through. */ 4596 4597 case R_byte4_data: 4598 if (! IS_FDPIC (abfd)) 4599 break; 4600 4601 picrel->sym = 1; 4602 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) 4603 picrel->relocs32++; 4604 break; 4605 4606 case R_BFIN_GOT17M4: 4607 picrel->got17m4 = 1; 4608 break; 4609 4610 case R_BFIN_GOTHI: 4611 case R_BFIN_GOTLO: 4612 picrel->gothilo = 1; 4613 break; 4614 4615 case R_BFIN_FUNCDESC_GOT17M4: 4616 picrel->fdgot17m4 = 1; 4617 break; 4618 4619 case R_BFIN_FUNCDESC_GOTHI: 4620 case R_BFIN_FUNCDESC_GOTLO: 4621 picrel->fdgothilo = 1; 4622 break; 4623 4624 case R_BFIN_GOTOFF17M4: 4625 case R_BFIN_GOTOFFHI: 4626 case R_BFIN_GOTOFFLO: 4627 picrel->gotoff = 1; 4628 break; 4629 4630 case R_BFIN_FUNCDESC_GOTOFF17M4: 4631 picrel->fdgoff17m4 = 1; 4632 break; 4633 4634 case R_BFIN_FUNCDESC_GOTOFFHI: 4635 case R_BFIN_FUNCDESC_GOTOFFLO: 4636 picrel->fdgoffhilo = 1; 4637 break; 4638 4639 case R_BFIN_FUNCDESC: 4640 picrel->fd = 1; 4641 picrel->relocsfd++; 4642 break; 4643 4644 /* This relocation describes the C++ object vtable hierarchy. 4645 Reconstruct it for later use during GC. */ 4646 case R_BFIN_GNU_VTINHERIT: 4647 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 4648 return FALSE; 4649 break; 4650 4651 /* This relocation describes which C++ vtable entries are actually 4652 used. Record for later use during GC. */ 4653 case R_BFIN_GNU_VTENTRY: 4654 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 4655 return FALSE; 4656 break; 4657 4658 case R_huimm16: 4659 case R_luimm16: 4660 case R_pcrel12_jump_s: 4661 case R_pcrel10: 4662 break; 4663 4664 default: 4665 bad_reloc: 4666 (*_bfd_error_handler) 4667 (_("%B: unsupported relocation type %i"), 4668 abfd, ELF32_R_TYPE (rel->r_info)); 4669 return FALSE; 4670 } 4671 } 4672 4673 return TRUE; 4674} 4675 4676/* Set the right machine number for a Blackfin ELF file. */ 4677 4678static bfd_boolean 4679elf32_bfin_object_p (bfd *abfd) 4680{ 4681 bfd_default_set_arch_mach (abfd, bfd_arch_bfin, 0); 4682 return (((elf_elfheader (abfd)->e_flags & EF_BFIN_FDPIC) != 0) 4683 == (IS_FDPIC (abfd))); 4684} 4685 4686static bfd_boolean 4687elf32_bfin_set_private_flags (bfd * abfd, flagword flags) 4688{ 4689 elf_elfheader (abfd)->e_flags = flags; 4690 elf_flags_init (abfd) = TRUE; 4691 return TRUE; 4692} 4693 4694/* Copy backend specific data from one object module to another. */ 4695 4696static bfd_boolean 4697bfin_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 4698{ 4699 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 4700 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 4701 return TRUE; 4702 4703 BFD_ASSERT (!elf_flags_init (obfd) 4704 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags); 4705 4706 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; 4707 elf_flags_init (obfd) = TRUE; 4708 return TRUE; 4709} 4710 4711static bfd_boolean 4712elf32_bfinfdpic_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 4713{ 4714 unsigned i; 4715 4716 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 4717 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 4718 return TRUE; 4719 4720 if (! bfin_elf_copy_private_bfd_data (ibfd, obfd)) 4721 return FALSE; 4722 4723 if (! elf_tdata (ibfd) || ! elf_tdata (ibfd)->phdr 4724 || ! elf_tdata (obfd) || ! elf_tdata (obfd)->phdr) 4725 return TRUE; 4726 4727 /* Copy the stack size. */ 4728 for (i = 0; i < elf_elfheader (ibfd)->e_phnum; i++) 4729 if (elf_tdata (ibfd)->phdr[i].p_type == PT_GNU_STACK) 4730 { 4731 Elf_Internal_Phdr *iphdr = &elf_tdata (ibfd)->phdr[i]; 4732 4733 for (i = 0; i < elf_elfheader (obfd)->e_phnum; i++) 4734 if (elf_tdata (obfd)->phdr[i].p_type == PT_GNU_STACK) 4735 { 4736 memcpy (&elf_tdata (obfd)->phdr[i], iphdr, sizeof (*iphdr)); 4737 4738 /* Rewrite the phdrs, since we're only called after they 4739 were first written. */ 4740 if (bfd_seek (obfd, (bfd_signed_vma) get_elf_backend_data (obfd) 4741 ->s->sizeof_ehdr, SEEK_SET) != 0 4742 || get_elf_backend_data (obfd)->s 4743 ->write_out_phdrs (obfd, elf_tdata (obfd)->phdr, 4744 elf_elfheader (obfd)->e_phnum) != 0) 4745 return FALSE; 4746 break; 4747 } 4748 4749 break; 4750 } 4751 4752 return TRUE; 4753} 4754 4755 4756/* Display the flags field. */ 4757static bfd_boolean 4758elf32_bfin_print_private_bfd_data (bfd * abfd, PTR ptr) 4759{ 4760 FILE *file = (FILE *) ptr; 4761 flagword flags; 4762 4763 BFD_ASSERT (abfd != NULL && ptr != NULL); 4764 4765 /* Print normal ELF private data. */ 4766 _bfd_elf_print_private_bfd_data (abfd, ptr); 4767 4768 flags = elf_elfheader (abfd)->e_flags; 4769 4770 /* xgettext:c-format */ 4771 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 4772 4773 if (flags & EF_BFIN_PIC) 4774 fprintf (file, " -fpic"); 4775 4776 if (flags & EF_BFIN_FDPIC) 4777 fprintf (file, " -mfdpic"); 4778 4779 fputc ('\n', file); 4780 4781 return TRUE; 4782} 4783 4784/* Merge backend specific data from an object file to the output 4785 object file when linking. */ 4786 4787static bfd_boolean 4788elf32_bfin_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 4789{ 4790 flagword old_flags, old_partial; 4791 flagword new_flags, new_partial; 4792 bfd_boolean error = FALSE; 4793 4794 new_flags = elf_elfheader (ibfd)->e_flags; 4795 old_flags = elf_elfheader (obfd)->e_flags; 4796 4797 if (new_flags & EF_BFIN_FDPIC) 4798 new_flags &= ~EF_BFIN_PIC; 4799 4800#ifdef DEBUG 4801 (*_bfd_error_handler) ("old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s, filename = %s", 4802 old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no", 4803 bfd_get_filename (ibfd)); 4804#endif 4805 4806 if (!elf_flags_init (obfd)) /* First call, no flags set. */ 4807 { 4808 elf_flags_init (obfd) = TRUE; 4809 old_flags = new_flags; 4810 } 4811 4812 else if (new_flags == old_flags) /* Compatible flags are ok. */ 4813 ; 4814 4815 else /* Possibly incompatible flags. */ 4816 { 4817 /* We don't have to do anything if the pic flags are the same, or the new 4818 module(s) were compiled with -mlibrary-pic. */ 4819 new_partial = (new_flags & EF_BFIN_PIC_FLAGS); 4820 old_partial = (old_flags & EF_BFIN_PIC_FLAGS); 4821 if (new_partial == old_partial) 4822 ; 4823 4824 /* If we have mixtures of -fpic and -fPIC, or in both bits. */ 4825 else if (new_partial != 0 && old_partial != 0) 4826 old_flags |= new_partial; 4827 4828 /* One module was compiled for pic and the other was not, see if we have 4829 had any relocations that are not pic-safe. */ 4830 else 4831 old_flags |= new_partial; 4832 4833 } 4834 4835 /* Update the old flags now with changes made above. */ 4836 elf_elfheader (obfd)->e_flags = old_flags; 4837 4838 if (((new_flags & EF_BFIN_FDPIC) == 0) 4839 != (! IS_FDPIC (ibfd))) 4840 { 4841 error = TRUE; 4842 if (IS_FDPIC (obfd)) 4843 (*_bfd_error_handler) 4844 (_("%s: cannot link non-fdpic object file into fdpic executable"), 4845 bfd_get_filename (ibfd)); 4846 else 4847 (*_bfd_error_handler) 4848 (_("%s: cannot link fdpic object file into non-fdpic executable"), 4849 bfd_get_filename (ibfd)); 4850 } 4851 4852 if (error) 4853 bfd_set_error (bfd_error_bad_value); 4854 4855 return !error; 4856} 4857 4858/* bfin ELF linker hash entry. */ 4859 4860struct bfin_link_hash_entry 4861{ 4862 struct elf_link_hash_entry root; 4863 4864 /* Number of PC relative relocs copied for this symbol. */ 4865 struct bfin_pcrel_relocs_copied *pcrel_relocs_copied; 4866}; 4867 4868/* bfin ELF linker hash table. */ 4869 4870struct bfin_link_hash_table 4871{ 4872 struct elf_link_hash_table root; 4873 4874 /* Small local sym to section mapping cache. */ 4875 struct sym_sec_cache sym_sec; 4876}; 4877 4878#define bfin_hash_entry(ent) ((struct bfin_link_hash_entry *) (ent)) 4879 4880static struct bfd_hash_entry * 4881bfin_link_hash_newfunc (struct bfd_hash_entry *entry, 4882 struct bfd_hash_table *table, const char *string) 4883{ 4884 struct bfd_hash_entry *ret = entry; 4885 4886 /* Allocate the structure if it has not already been allocated by a 4887 subclass. */ 4888 if (ret == NULL) 4889 ret = bfd_hash_allocate (table, sizeof (struct bfin_link_hash_entry)); 4890 if (ret == NULL) 4891 return ret; 4892 4893 /* Call the allocation method of the superclass. */ 4894 ret = _bfd_elf_link_hash_newfunc (ret, table, string); 4895 if (ret != NULL) 4896 bfin_hash_entry (ret)->pcrel_relocs_copied = NULL; 4897 4898 return ret; 4899} 4900 4901/* Create an bfin ELF linker hash table. */ 4902 4903static struct bfd_link_hash_table * 4904bfin_link_hash_table_create (bfd * abfd) 4905{ 4906 struct bfin_link_hash_table *ret; 4907 bfd_size_type amt = sizeof (struct bfin_link_hash_table); 4908 4909 ret = bfd_zalloc (abfd, amt); 4910 if (ret == NULL) 4911 return NULL; 4912 4913 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 4914 bfin_link_hash_newfunc, 4915 sizeof (struct elf_link_hash_entry))) 4916 { 4917 free (ret); 4918 return NULL; 4919 } 4920 4921 ret->sym_sec.abfd = NULL; 4922 4923 return &ret->root.root; 4924} 4925 4926/* The size in bytes of an entry in the procedure linkage table. */ 4927 4928/* Finish up the dynamic sections. */ 4929 4930static bfd_boolean 4931bfin_finish_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED, 4932 struct bfd_link_info *info) 4933{ 4934 bfd *dynobj; 4935 asection *sdyn; 4936 4937 dynobj = elf_hash_table (info)->dynobj; 4938 4939 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 4940 4941 if (elf_hash_table (info)->dynamic_sections_created) 4942 { 4943 Elf32_External_Dyn *dyncon, *dynconend; 4944 4945 BFD_ASSERT (sdyn != NULL); 4946 4947 dyncon = (Elf32_External_Dyn *) sdyn->contents; 4948 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 4949 for (; dyncon < dynconend; dyncon++) 4950 { 4951 Elf_Internal_Dyn dyn; 4952 4953 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 4954 4955 } 4956 4957 } 4958 return TRUE; 4959} 4960 4961/* Finish up dynamic symbol handling. We set the contents of various 4962 dynamic sections here. */ 4963 4964static bfd_boolean 4965bfin_finish_dynamic_symbol (bfd * output_bfd, 4966 struct bfd_link_info *info, 4967 struct elf_link_hash_entry *h, 4968 Elf_Internal_Sym * sym) 4969{ 4970 bfd *dynobj; 4971 4972 dynobj = elf_hash_table (info)->dynobj; 4973 4974 if (h->got.offset != (bfd_vma) - 1) 4975 { 4976 asection *sgot; 4977 asection *srela; 4978 Elf_Internal_Rela rela; 4979 bfd_byte *loc; 4980 4981 /* This symbol has an entry in the global offset table. 4982 Set it up. */ 4983 4984 sgot = bfd_get_section_by_name (dynobj, ".got"); 4985 srela = bfd_get_section_by_name (dynobj, ".rela.got"); 4986 BFD_ASSERT (sgot != NULL && srela != NULL); 4987 4988 rela.r_offset = (sgot->output_section->vma 4989 + sgot->output_offset 4990 + (h->got.offset & ~(bfd_vma) 1)); 4991 4992 /* If this is a -Bsymbolic link, and the symbol is defined 4993 locally, we just want to emit a RELATIVE reloc. Likewise if 4994 the symbol was forced to be local because of a version file. 4995 The entry in the global offset table will already have been 4996 initialized in the relocate_section function. */ 4997 if (info->shared 4998 && (info->symbolic 4999 || h->dynindx == -1 || h->forced_local) && h->def_regular) 5000 { 5001 fprintf(stderr, "*** check this relocation %s\n", __FUNCTION__); 5002 rela.r_info = ELF32_R_INFO (0, R_pcrel24); 5003 rela.r_addend = bfd_get_signed_32 (output_bfd, 5004 (sgot->contents 5005 + 5006 (h->got. 5007 offset & ~(bfd_vma) 1))); 5008 } 5009 else 5010 { 5011 bfd_put_32 (output_bfd, (bfd_vma) 0, 5012 sgot->contents + (h->got.offset & ~(bfd_vma) 1)); 5013 rela.r_info = ELF32_R_INFO (h->dynindx, R_got); 5014 rela.r_addend = 0; 5015 } 5016 5017 loc = srela->contents; 5018 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 5019 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 5020 } 5021 5022 if (h->needs_copy) 5023 { 5024 BFD_ASSERT (0); 5025 } 5026 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 5027 if (strcmp (h->root.root.string, "__DYNAMIC") == 0 5028 || h == elf_hash_table (info)->hgot) 5029 sym->st_shndx = SHN_ABS; 5030 5031 return TRUE; 5032} 5033 5034/* Adjust a symbol defined by a dynamic object and referenced by a 5035 regular object. The current definition is in some section of the 5036 dynamic object, but we're not including those sections. We have to 5037 change the definition to something the rest of the link can 5038 understand. */ 5039 5040static bfd_boolean 5041bfin_adjust_dynamic_symbol (struct bfd_link_info *info, 5042 struct elf_link_hash_entry *h) 5043{ 5044 bfd *dynobj; 5045 asection *s; 5046 unsigned int power_of_two; 5047 5048 dynobj = elf_hash_table (info)->dynobj; 5049 5050 /* Make sure we know what is going on here. */ 5051 BFD_ASSERT (dynobj != NULL 5052 && (h->needs_plt 5053 || h->u.weakdef != NULL 5054 || (h->def_dynamic && h->ref_regular && !h->def_regular))); 5055 5056 /* If this is a function, put it in the procedure linkage table. We 5057 will fill in the contents of the procedure linkage table later, 5058 when we know the address of the .got section. */ 5059 if (h->type == STT_FUNC || h->needs_plt) 5060 { 5061 BFD_ASSERT(0); 5062 } 5063 5064 /* If this is a weak symbol, and there is a real definition, the 5065 processor independent code will have arranged for us to see the 5066 real definition first, and we can just use the same value. */ 5067 if (h->u.weakdef != NULL) 5068 { 5069 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 5070 || h->u.weakdef->root.type == bfd_link_hash_defweak); 5071 h->root.u.def.section = h->u.weakdef->root.u.def.section; 5072 h->root.u.def.value = h->u.weakdef->root.u.def.value; 5073 return TRUE; 5074 } 5075 5076 /* This is a reference to a symbol defined by a dynamic object which 5077 is not a function. */ 5078 5079 /* If we are creating a shared library, we must presume that the 5080 only references to the symbol are via the global offset table. 5081 For such cases we need not do anything here; the relocations will 5082 be handled correctly by relocate_section. */ 5083 if (info->shared) 5084 return TRUE; 5085 5086 /* We must allocate the symbol in our .dynbss section, which will 5087 become part of the .bss section of the executable. There will be 5088 an entry for this symbol in the .dynsym section. The dynamic 5089 object will contain position independent code, so all references 5090 from the dynamic object to this symbol will go through the global 5091 offset table. The dynamic linker will use the .dynsym entry to 5092 determine the address it must put in the global offset table, so 5093 both the dynamic object and the regular object will refer to the 5094 same memory location for the variable. */ 5095 5096 s = bfd_get_section_by_name (dynobj, ".dynbss"); 5097 BFD_ASSERT (s != NULL); 5098 5099 /* We must generate a R_68K_COPY reloc to tell the dynamic linker to 5100 copy the initial value out of the dynamic object and into the 5101 runtime process image. We need to remember the offset into the 5102 .rela.bss section we are going to use. */ 5103 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 5104 { 5105 asection *srel; 5106 5107 srel = bfd_get_section_by_name (dynobj, ".rela.bss"); 5108 BFD_ASSERT (srel != NULL); 5109 srel->size += sizeof (Elf32_External_Rela); 5110 h->needs_copy = 1; 5111 } 5112 5113 /* We need to figure out the alignment required for this symbol. I 5114 have no idea how ELF linkers handle this. */ 5115 power_of_two = bfd_log2 (h->size); 5116 if (power_of_two > 3) 5117 power_of_two = 3; 5118 5119 /* Apply the required alignment. */ 5120 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 5121 if (power_of_two > bfd_get_section_alignment (dynobj, s)) 5122 { 5123 if (!bfd_set_section_alignment (dynobj, s, power_of_two)) 5124 return FALSE; 5125 } 5126 5127 /* Define the symbol as being at this point in the section. */ 5128 h->root.u.def.section = s; 5129 h->root.u.def.value = s->size; 5130 5131 /* Increment the section size to make room for the symbol. */ 5132 s->size += h->size; 5133 5134 return TRUE; 5135} 5136 5137/* The bfin linker needs to keep track of the number of relocs that it 5138 decides to copy in check_relocs for each symbol. This is so that it 5139 can discard PC relative relocs if it doesn't need them when linking 5140 with -Bsymbolic. We store the information in a field extending the 5141 regular ELF linker hash table. */ 5142 5143/* This structure keeps track of the number of PC relative relocs we have 5144 copied for a given symbol. */ 5145 5146struct bfin_pcrel_relocs_copied 5147{ 5148 /* Next section. */ 5149 struct bfin_pcrel_relocs_copied *next; 5150 /* A section in dynobj. */ 5151 asection *section; 5152 /* Number of relocs copied in this section. */ 5153 bfd_size_type count; 5154}; 5155 5156/* This function is called via elf_link_hash_traverse if we are 5157 creating a shared object. In the -Bsymbolic case it discards the 5158 space allocated to copy PC relative relocs against symbols which 5159 are defined in regular objects. For the normal shared case, it 5160 discards space for pc-relative relocs that have become local due to 5161 symbol visibility changes. We allocated space for them in the 5162 check_relocs routine, but we won't fill them in in the 5163 relocate_section routine. 5164 5165 We also check whether any of the remaining relocations apply 5166 against a readonly section, and set the DF_TEXTREL flag in this 5167 case. */ 5168 5169static bfd_boolean 5170bfin_discard_copies (struct elf_link_hash_entry *h, PTR inf) 5171{ 5172 struct bfd_link_info *info = (struct bfd_link_info *) inf; 5173 struct bfin_pcrel_relocs_copied *s; 5174 5175 if (h->root.type == bfd_link_hash_warning) 5176 h = (struct elf_link_hash_entry *) h->root.u.i.link; 5177 5178 if (!h->def_regular || (!info->symbolic && !h->forced_local)) 5179 { 5180 if ((info->flags & DF_TEXTREL) == 0) 5181 { 5182 /* Look for relocations against read-only sections. */ 5183 for (s = bfin_hash_entry (h)->pcrel_relocs_copied; 5184 s != NULL; s = s->next) 5185 if ((s->section->flags & SEC_READONLY) != 0) 5186 { 5187 info->flags |= DF_TEXTREL; 5188 break; 5189 } 5190 } 5191 5192 return TRUE; 5193 } 5194 5195 for (s = bfin_hash_entry (h)->pcrel_relocs_copied; 5196 s != NULL; s = s->next) 5197 s->section->size -= s->count * sizeof (Elf32_External_Rela); 5198 5199 return TRUE; 5200} 5201 5202static bfd_boolean 5203bfin_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED, 5204 struct bfd_link_info *info) 5205{ 5206 bfd *dynobj; 5207 asection *s; 5208 bfd_boolean relocs; 5209 5210 dynobj = elf_hash_table (info)->dynobj; 5211 BFD_ASSERT (dynobj != NULL); 5212 5213 if (elf_hash_table (info)->dynamic_sections_created) 5214 { 5215 /* Set the contents of the .interp section to the interpreter. */ 5216 if (info->executable) 5217 { 5218 s = bfd_get_section_by_name (dynobj, ".interp"); 5219 BFD_ASSERT (s != NULL); 5220 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 5221 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 5222 } 5223 } 5224 else 5225 { 5226 /* We may have created entries in the .rela.got section. 5227 However, if we are not creating the dynamic sections, we will 5228 not actually use these entries. Reset the size of .rela.got, 5229 which will cause it to get stripped from the output file 5230 below. */ 5231 s = bfd_get_section_by_name (dynobj, ".rela.got"); 5232 if (s != NULL) 5233 s->size = 0; 5234 } 5235 5236 /* If this is a -Bsymbolic shared link, then we need to discard all 5237 PC relative relocs against symbols defined in a regular object. 5238 For the normal shared case we discard the PC relative relocs 5239 against symbols that have become local due to visibility changes. 5240 We allocated space for them in the check_relocs routine, but we 5241 will not fill them in in the relocate_section routine. */ 5242 if (info->shared) 5243 elf_link_hash_traverse (elf_hash_table (info), 5244 bfin_discard_copies, (PTR) info); 5245 5246 /* The check_relocs and adjust_dynamic_symbol entry points have 5247 determined the sizes of the various dynamic sections. Allocate 5248 memory for them. */ 5249 relocs = FALSE; 5250 for (s = dynobj->sections; s != NULL; s = s->next) 5251 { 5252 const char *name; 5253 bfd_boolean strip; 5254 5255 if ((s->flags & SEC_LINKER_CREATED) == 0) 5256 continue; 5257 5258 /* It's OK to base decisions on the section name, because none 5259 of the dynobj section names depend upon the input files. */ 5260 name = bfd_get_section_name (dynobj, s); 5261 5262 strip = FALSE; 5263 5264 if (CONST_STRNEQ (name, ".rela")) 5265 { 5266 if (s->size == 0) 5267 { 5268 /* If we don't need this section, strip it from the 5269 output file. This is mostly to handle .rela.bss and 5270 .rela.plt. We must create both sections in 5271 create_dynamic_sections, because they must be created 5272 before the linker maps input sections to output 5273 sections. The linker does that before 5274 adjust_dynamic_symbol is called, and it is that 5275 function which decides whether anything needs to go 5276 into these sections. */ 5277 strip = TRUE; 5278 } 5279 else 5280 { 5281 relocs = TRUE; 5282 5283 /* We use the reloc_count field as a counter if we need 5284 to copy relocs into the output file. */ 5285 s->reloc_count = 0; 5286 } 5287 } 5288 else if (! CONST_STRNEQ (name, ".got")) 5289 { 5290 /* It's not one of our sections, so don't allocate space. */ 5291 continue; 5292 } 5293 5294 if (strip) 5295 { 5296 s->flags |= SEC_EXCLUDE; 5297 continue; 5298 } 5299 5300 /* Allocate memory for the section contents. */ 5301 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 5302 Unused entries should be reclaimed before the section's contents 5303 are written out, but at the moment this does not happen. Thus in 5304 order to prevent writing out garbage, we initialise the section's 5305 contents to zero. */ 5306 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 5307 if (s->contents == NULL && s->size != 0) 5308 return FALSE; 5309 } 5310 5311 if (elf_hash_table (info)->dynamic_sections_created) 5312 { 5313 /* Add some entries to the .dynamic section. We fill in the 5314 values later, in bfin_finish_dynamic_sections, but we 5315 must add the entries now so that we get the correct size for 5316 the .dynamic section. The DT_DEBUG entry is filled in by the 5317 dynamic linker and used by the debugger. */ 5318#define add_dynamic_entry(TAG, VAL) \ 5319 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 5320 5321 if (!info->shared) 5322 { 5323 if (!add_dynamic_entry (DT_DEBUG, 0)) 5324 return FALSE; 5325 } 5326 5327 5328 if (relocs) 5329 { 5330 if (!add_dynamic_entry (DT_RELA, 0) 5331 || !add_dynamic_entry (DT_RELASZ, 0) 5332 || !add_dynamic_entry (DT_RELAENT, 5333 sizeof (Elf32_External_Rela))) 5334 return FALSE; 5335 } 5336 5337 if ((info->flags & DF_TEXTREL) != 0) 5338 { 5339 if (!add_dynamic_entry (DT_TEXTREL, 0)) 5340 return FALSE; 5341 } 5342 } 5343#undef add_dynamic_entry 5344 5345 return TRUE; 5346} 5347 5348/* Given a .data section and a .emreloc in-memory section, store 5349 relocation information into the .emreloc section which can be 5350 used at runtime to relocate the section. This is called by the 5351 linker when the --embedded-relocs switch is used. This is called 5352 after the add_symbols entry point has been called for all the 5353 objects, and before the final_link entry point is called. */ 5354 5355bfd_boolean bfd_bfin_elf32_create_embedded_relocs 5356 PARAMS ((bfd *, struct bfd_link_info *, asection *, asection *, char **)); 5357 5358bfd_boolean 5359bfd_bfin_elf32_create_embedded_relocs ( 5360 bfd *abfd, 5361 struct bfd_link_info *info, 5362 asection *datasec, 5363 asection *relsec, 5364 char **errmsg) 5365{ 5366 Elf_Internal_Shdr *symtab_hdr; 5367 Elf_Internal_Sym *isymbuf = NULL; 5368 Elf_Internal_Rela *internal_relocs = NULL; 5369 Elf_Internal_Rela *irel, *irelend; 5370 bfd_byte *p; 5371 bfd_size_type amt; 5372 5373 BFD_ASSERT (! info->relocatable); 5374 5375 *errmsg = NULL; 5376 5377 if (datasec->reloc_count == 0) 5378 return TRUE; 5379 5380 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 5381 5382 /* Get a copy of the native relocations. */ 5383 internal_relocs = (_bfd_elf_link_read_relocs 5384 (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL, 5385 info->keep_memory)); 5386 if (internal_relocs == NULL) 5387 goto error_return; 5388 5389 amt = (bfd_size_type) datasec->reloc_count * 12; 5390 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 5391 if (relsec->contents == NULL) 5392 goto error_return; 5393 5394 p = relsec->contents; 5395 5396 irelend = internal_relocs + datasec->reloc_count; 5397 for (irel = internal_relocs; irel < irelend; irel++, p += 12) 5398 { 5399 asection *targetsec; 5400 5401 /* We are going to write a four byte longword into the runtime 5402 reloc section. The longword will be the address in the data 5403 section which must be relocated. It is followed by the name 5404 of the target section NUL-padded or truncated to 8 5405 characters. */ 5406 5407 /* We can only relocate absolute longword relocs at run time. */ 5408 if (ELF32_R_TYPE (irel->r_info) != (int) R_byte4_data) 5409 { 5410 *errmsg = _("unsupported reloc type"); 5411 bfd_set_error (bfd_error_bad_value); 5412 goto error_return; 5413 } 5414 5415 /* Get the target section referred to by the reloc. */ 5416 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 5417 { 5418 /* A local symbol. */ 5419 Elf_Internal_Sym *isym; 5420 5421 /* Read this BFD's local symbols if we haven't done so already. */ 5422 if (isymbuf == NULL) 5423 { 5424 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 5425 if (isymbuf == NULL) 5426 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 5427 symtab_hdr->sh_info, 0, 5428 NULL, NULL, NULL); 5429 if (isymbuf == NULL) 5430 goto error_return; 5431 } 5432 5433 isym = isymbuf + ELF32_R_SYM (irel->r_info); 5434 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 5435 } 5436 else 5437 { 5438 unsigned long indx; 5439 struct elf_link_hash_entry *h; 5440 5441 /* An external symbol. */ 5442 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 5443 h = elf_sym_hashes (abfd)[indx]; 5444 BFD_ASSERT (h != NULL); 5445 if (h->root.type == bfd_link_hash_defined 5446 || h->root.type == bfd_link_hash_defweak) 5447 targetsec = h->root.u.def.section; 5448 else 5449 targetsec = NULL; 5450 } 5451 5452 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 5453 memset (p + 4, 0, 8); 5454 if (targetsec != NULL) 5455 strncpy ((char *) p + 4, targetsec->output_section->name, 8); 5456 } 5457 5458 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 5459 free (isymbuf); 5460 if (internal_relocs != NULL 5461 && elf_section_data (datasec)->relocs != internal_relocs) 5462 free (internal_relocs); 5463 return TRUE; 5464 5465error_return: 5466 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 5467 free (isymbuf); 5468 if (internal_relocs != NULL 5469 && elf_section_data (datasec)->relocs != internal_relocs) 5470 free (internal_relocs); 5471 return FALSE; 5472} 5473 5474#define TARGET_LITTLE_SYM bfd_elf32_bfin_vec 5475#define TARGET_LITTLE_NAME "elf32-bfin" 5476#define ELF_ARCH bfd_arch_bfin 5477#define ELF_MACHINE_CODE EM_BLACKFIN 5478#define ELF_MAXPAGESIZE 0x1000 5479#define elf_symbol_leading_char '_' 5480 5481#define bfd_elf32_bfd_reloc_type_lookup bfin_bfd_reloc_type_lookup 5482#define elf_info_to_howto bfin_info_to_howto 5483#define elf_info_to_howto_rel 0 5484#define elf_backend_object_p elf32_bfin_object_p 5485 5486#define bfd_elf32_bfd_is_local_label_name \ 5487 bfin_is_local_label_name 5488#define bfin_hash_table(p) \ 5489 ((struct bfin_link_hash_table *) (p)->hash) 5490 5491 5492 5493#define elf_backend_create_dynamic_sections \ 5494 _bfd_elf_create_dynamic_sections 5495#define bfd_elf32_bfd_link_hash_table_create \ 5496 bfin_link_hash_table_create 5497#define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link 5498 5499#define elf_backend_check_relocs bfin_check_relocs 5500#define elf_backend_adjust_dynamic_symbol \ 5501 bfin_adjust_dynamic_symbol 5502#define elf_backend_size_dynamic_sections \ 5503 bfin_size_dynamic_sections 5504#define elf_backend_relocate_section bfin_relocate_section 5505#define elf_backend_finish_dynamic_symbol \ 5506 bfin_finish_dynamic_symbol 5507#define elf_backend_finish_dynamic_sections \ 5508 bfin_finish_dynamic_sections 5509#define elf_backend_gc_mark_hook bfin_gc_mark_hook 5510#define elf_backend_gc_sweep_hook bfin_gc_sweep_hook 5511#define bfd_elf32_bfd_merge_private_bfd_data \ 5512 elf32_bfin_merge_private_bfd_data 5513#define bfd_elf32_bfd_set_private_flags \ 5514 elf32_bfin_set_private_flags 5515#define bfd_elf32_bfd_print_private_bfd_data \ 5516 elf32_bfin_print_private_bfd_data 5517#define elf_backend_reloc_type_class elf32_bfin_reloc_type_class 5518#define elf_backend_can_gc_sections 1 5519#define elf_backend_can_refcount 1 5520#define elf_backend_want_got_plt 0 5521#define elf_backend_plt_readonly 1 5522#define elf_backend_want_plt_sym 0 5523#define elf_backend_got_header_size 12 5524#define elf_backend_rela_normal 1 5525 5526#include "elf32-target.h" 5527 5528#undef TARGET_LITTLE_SYM 5529#define TARGET_LITTLE_SYM bfd_elf32_bfinfdpic_vec 5530#undef TARGET_LITTLE_NAME 5531#define TARGET_LITTLE_NAME "elf32-bfinfdpic" 5532#undef elf32_bed 5533#define elf32_bed elf32_bfinfdpic_bed 5534 5535#undef elf_backend_gc_sweep_hook 5536 5537#undef elf_backend_got_header_size 5538#define elf_backend_got_header_size 0 5539 5540#undef elf_backend_relocate_section 5541#define elf_backend_relocate_section bfinfdpic_relocate_section 5542#undef elf_backend_check_relocs 5543#define elf_backend_check_relocs bfinfdpic_check_relocs 5544 5545#undef bfd_elf32_bfd_link_hash_table_create 5546#define bfd_elf32_bfd_link_hash_table_create \ 5547 bfinfdpic_elf_link_hash_table_create 5548#undef elf_backend_always_size_sections 5549#define elf_backend_always_size_sections \ 5550 elf32_bfinfdpic_always_size_sections 5551#undef elf_backend_modify_program_headers 5552#define elf_backend_modify_program_headers \ 5553 elf32_bfinfdpic_modify_program_headers 5554#undef bfd_elf32_bfd_copy_private_bfd_data 5555#define bfd_elf32_bfd_copy_private_bfd_data \ 5556 elf32_bfinfdpic_copy_private_bfd_data 5557 5558#undef elf_backend_create_dynamic_sections 5559#define elf_backend_create_dynamic_sections \ 5560 elf32_bfinfdpic_create_dynamic_sections 5561#undef elf_backend_adjust_dynamic_symbol 5562#define elf_backend_adjust_dynamic_symbol \ 5563 elf32_bfinfdpic_adjust_dynamic_symbol 5564#undef elf_backend_size_dynamic_sections 5565#define elf_backend_size_dynamic_sections \ 5566 elf32_bfinfdpic_size_dynamic_sections 5567#undef elf_backend_finish_dynamic_symbol 5568#define elf_backend_finish_dynamic_symbol \ 5569 elf32_bfinfdpic_finish_dynamic_symbol 5570#undef elf_backend_finish_dynamic_sections 5571#define elf_backend_finish_dynamic_sections \ 5572 elf32_bfinfdpic_finish_dynamic_sections 5573 5574#undef elf_backend_can_make_relative_eh_frame 5575#define elf_backend_can_make_relative_eh_frame \ 5576 bfinfdpic_elf_use_relative_eh_frame 5577#undef elf_backend_can_make_lsda_relative_eh_frame 5578#define elf_backend_can_make_lsda_relative_eh_frame \ 5579 bfinfdpic_elf_use_relative_eh_frame 5580#undef elf_backend_encode_eh_address 5581#define elf_backend_encode_eh_address \ 5582 bfinfdpic_elf_encode_eh_address 5583 5584#undef elf_backend_may_use_rel_p 5585#define elf_backend_may_use_rel_p 1 5586#undef elf_backend_may_use_rela_p 5587#define elf_backend_may_use_rela_p 1 5588/* We use REL for dynamic relocations only. */ 5589#undef elf_backend_default_use_rela_p 5590#define elf_backend_default_use_rela_p 1 5591 5592#undef elf_backend_omit_section_dynsym 5593#define elf_backend_omit_section_dynsym _bfinfdpic_link_omit_section_dynsym 5594 5595#include "elf32-target.h" 5596