1/* ADI Blackfin BFD support for 32-bit ELF. 2 Copyright (C) 2005-2017 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 3 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, 19 MA 02110-1301, USA. */ 20 21#include "sysdep.h" 22#include "bfd.h" 23#include "libbfd.h" 24#include "elf-bfd.h" 25#include "elf/bfin.h" 26#include "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 void * 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 void * 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 _bfd_error_handler (_("relocation should be even number")); 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 void * 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 void * 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 void * 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 _bfd_error_handler (_("relocation should be even number")); 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_BFIN_UNUSED0, /* type. */ 425 0, /* rightshift. */ 426 3, /* size (0 = byte, 1 = short, 2 = long). */ 427 0, /* bitsize. */ 428 FALSE, /* pc_relative. */ 429 0, /* bitpos. */ 430 complain_overflow_dont, /* complain_on_overflow. */ 431 bfd_elf_generic_reloc, /* special_function. */ 432 "R_BFIN_UNUSED0", /* name. */ 433 FALSE, /* partial_inplace. */ 434 0, /* src_mask. */ 435 0, /* dst_mask. */ 436 FALSE), /* pcrel_offset. */ 437 438 HOWTO (R_BFIN_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_BFIN_PCREL5M2", /* name. */ 447 FALSE, /* partial_inplace. */ 448 0, /* src_mask. */ 449 0x0000000F, /* dst_mask. */ 450 FALSE), /* pcrel_offset. */ 451 452 HOWTO (R_BFIN_UNUSED1, /* type. */ 453 0, /* rightshift. */ 454 3, /* size (0 = byte, 1 = short, 2 = long). */ 455 0, /* bitsize. */ 456 FALSE, /* pc_relative. */ 457 0, /* bitpos. */ 458 complain_overflow_dont, /* complain_on_overflow. */ 459 bfd_elf_generic_reloc, /* special_function. */ 460 "R_BFIN_UNUSED1", /* name. */ 461 FALSE, /* partial_inplace. */ 462 0, /* src_mask. */ 463 0, /* dst_mask. */ 464 FALSE), /* pcrel_offset. */ 465 466 HOWTO (R_BFIN_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_BFIN_PCREL10", /* name. */ 475 FALSE, /* partial_inplace. */ 476 0, /* src_mask. */ 477 0x000003FF, /* dst_mask. */ 478 TRUE), /* pcrel_offset. */ 479 480 HOWTO (R_BFIN_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_BFIN_PCREL12_JUMP", /* name. */ 493 FALSE, /* partial_inplace. */ 494 0, /* src_mask. */ 495 0x0FFF, /* dst_mask. */ 496 TRUE), /* pcrel_offset. */ 497 498 HOWTO (R_BFIN_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_BFIN_RIMM16", /* name. */ 507 FALSE, /* partial_inplace. */ 508 0, /* src_mask. */ 509 0x0000FFFF, /* dst_mask. */ 510 TRUE), /* pcrel_offset. */ 511 512 HOWTO (R_BFIN_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_BFIN_LUIMM16", /* name. */ 521 FALSE, /* partial_inplace. */ 522 0, /* src_mask. */ 523 0x0000FFFF, /* dst_mask. */ 524 TRUE), /* pcrel_offset. */ 525 526 HOWTO (R_BFIN_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_BFIN_HUIMM16", /* name. */ 535 FALSE, /* partial_inplace. */ 536 0, /* src_mask. */ 537 0x0000FFFF, /* dst_mask. */ 538 TRUE), /* pcrel_offset. */ 539 540 HOWTO (R_BFIN_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_BFIN_PCREL12_JUMP_S", /* name. */ 549 FALSE, /* partial_inplace. */ 550 0, /* src_mask. */ 551 0x00000FFF, /* dst_mask. */ 552 TRUE), /* pcrel_offset. */ 553 554 HOWTO (R_BFIN_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_BFIN_PCREL24_JUMP_X", /* name. */ 563 FALSE, /* partial_inplace. */ 564 0, /* src_mask. */ 565 0x00FFFFFF, /* dst_mask. */ 566 TRUE), /* pcrel_offset. */ 567 568 HOWTO (R_BFIN_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_BFIN_PCREL24", /* name. */ 577 FALSE, /* partial_inplace. */ 578 0, /* src_mask. */ 579 0x00FFFFFF, /* dst_mask. */ 580 TRUE), /* pcrel_offset. */ 581 582 HOWTO (R_BFIN_UNUSEDB, /* type. */ 583 0, /* rightshift. */ 584 3, /* size (0 = byte, 1 = short, 2 = long). */ 585 0, /* bitsize. */ 586 FALSE, /* pc_relative. */ 587 0, /* bitpos. */ 588 complain_overflow_dont, /* complain_on_overflow. */ 589 bfd_elf_generic_reloc, /* special_function. */ 590 "R_BFIN_UNUSEDB", /* name. */ 591 FALSE, /* partial_inplace. */ 592 0, /* src_mask. */ 593 0, /* dst_mask. */ 594 FALSE), /* pcrel_offset. */ 595 596 HOWTO (R_BFIN_UNUSEDC, /* type. */ 597 0, /* rightshift. */ 598 3, /* size (0 = byte, 1 = short, 2 = long). */ 599 0, /* bitsize. */ 600 FALSE, /* pc_relative. */ 601 0, /* bitpos. */ 602 complain_overflow_dont, /* complain_on_overflow. */ 603 bfd_elf_generic_reloc, /* special_function. */ 604 "R_BFIN_UNUSEDC", /* name. */ 605 FALSE, /* partial_inplace. */ 606 0, /* src_mask. */ 607 0, /* dst_mask. */ 608 FALSE), /* pcrel_offset. */ 609 610 HOWTO (R_BFIN_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_BFIN_PCREL24_JUMP_L", /* name. */ 619 FALSE, /* partial_inplace. */ 620 0, /* src_mask. */ 621 0x00FFFFFF, /* dst_mask. */ 622 TRUE), /* pcrel_offset. */ 623 624 HOWTO (R_BFIN_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_BFIN_PCREL24_CALL_X", /* name. */ 633 FALSE, /* partial_inplace. */ 634 0, /* src_mask. */ 635 0x00FFFFFF, /* dst_mask. */ 636 TRUE), /* pcrel_offset. */ 637 638 HOWTO (R_BFIN_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_BFIN_VAR_EQ_SYMB", /* name. */ 647 FALSE, /* partial_inplace. */ 648 0, /* src_mask. */ 649 0, /* dst_mask. */ 650 FALSE), /* pcrel_offset. */ 651 652 HOWTO (R_BFIN_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_BFIN_BYTE_DATA", /* name. */ 661 FALSE, /* partial_inplace. */ 662 0, /* src_mask. */ 663 0xFF, /* dst_mask. */ 664 TRUE), /* pcrel_offset. */ 665 666 HOWTO (R_BFIN_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_BFIN_BYTE2_DATA", /* name. */ 675 FALSE, /* partial_inplace. */ 676 0, /* src_mask. */ 677 0xFFFF, /* dst_mask. */ 678 TRUE), /* pcrel_offset. */ 679 680 HOWTO (R_BFIN_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_BFIN_BYTE4_DATA", /* name. */ 689 FALSE, /* partial_inplace. */ 690 0, /* src_mask. */ 691 0xFFFFFFFF, /* dst_mask. */ 692 TRUE), /* pcrel_offset. */ 693 694 HOWTO (R_BFIN_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_BFIN_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_GOT17M4", /* 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_BFIN_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_BFIN_PLTPC", /* name. */ 943 FALSE, /* partial_inplace. */ 944 0xffff, /* src_mask. */ 945 0xffff, /* dst_mask. */ 946 FALSE), /* pcrel_offset. */ 947 948 HOWTO (R_BFIN_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_BFIN_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_BFIN_UNUSED0 }, 1002 { BFD_RELOC_BFIN_5_PCREL, R_BFIN_PCREL5M2 }, 1003 { BFD_RELOC_NONE, R_BFIN_UNUSED1 }, 1004 { BFD_RELOC_BFIN_10_PCREL, R_BFIN_PCREL10 }, 1005 { BFD_RELOC_BFIN_12_PCREL_JUMP, R_BFIN_PCREL12_JUMP }, 1006 { BFD_RELOC_BFIN_16_IMM, R_BFIN_RIMM16 }, 1007 { BFD_RELOC_BFIN_16_LOW, R_BFIN_LUIMM16 }, 1008 { BFD_RELOC_BFIN_16_HIGH, R_BFIN_HUIMM16 }, 1009 { BFD_RELOC_BFIN_12_PCREL_JUMP_S, R_BFIN_PCREL12_JUMP_S }, 1010 { BFD_RELOC_24_PCREL, R_BFIN_PCREL24 }, 1011 { BFD_RELOC_24_PCREL, R_BFIN_PCREL24 }, 1012 { BFD_RELOC_BFIN_24_PCREL_JUMP_L, R_BFIN_PCREL24_JUMP_L }, 1013 { BFD_RELOC_NONE, R_BFIN_UNUSEDB }, 1014 { BFD_RELOC_NONE, R_BFIN_UNUSEDC }, 1015 { BFD_RELOC_BFIN_24_PCREL_CALL_X, R_BFIN_PCREL24_CALL_X }, 1016 { BFD_RELOC_8, R_BFIN_BYTE_DATA }, 1017 { BFD_RELOC_16, R_BFIN_BYTE2_DATA }, 1018 { BFD_RELOC_32, R_BFIN_BYTE4_DATA }, 1019 { BFD_RELOC_BFIN_11_PCREL, R_BFIN_PCREL11 }, 1020 { BFD_RELOC_BFIN_GOT, R_BFIN_GOT }, 1021 { BFD_RELOC_BFIN_PLTPC, R_BFIN_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 = (unsigned int) -1; 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) 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 1083static reloc_howto_type * 1084bfin_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1085 const char *r_name) 1086{ 1087 unsigned int i; 1088 1089 for (i = 0; 1090 i < (sizeof (bfin_howto_table) 1091 / sizeof (bfin_howto_table[0])); 1092 i++) 1093 if (bfin_howto_table[i].name != NULL 1094 && strcasecmp (bfin_howto_table[i].name, r_name) == 0) 1095 return &bfin_howto_table[i]; 1096 1097 for (i = 0; 1098 i < (sizeof (bfin_gnuext_howto_table) 1099 / sizeof (bfin_gnuext_howto_table[0])); 1100 i++) 1101 if (bfin_gnuext_howto_table[i].name != NULL 1102 && strcasecmp (bfin_gnuext_howto_table[i].name, r_name) == 0) 1103 return &bfin_gnuext_howto_table[i]; 1104 1105 return NULL; 1106} 1107 1108/* Given a bfin relocation type, return the howto. */ 1109static reloc_howto_type * 1110bfin_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, 1111 unsigned int r_type) 1112{ 1113 if (r_type <= BFIN_RELOC_MAX) 1114 return &bfin_howto_table [r_type]; 1115 1116 else if (r_type >= BFIN_GNUEXT_RELOC_MIN && r_type <= BFIN_GNUEXT_RELOC_MAX) 1117 return &bfin_gnuext_howto_table [r_type - BFIN_GNUEXT_RELOC_MIN]; 1118 1119 return (reloc_howto_type *) NULL; 1120} 1121 1122/* Set by ld emulation if --code-in-l1. */ 1123bfd_boolean elf32_bfin_code_in_l1 = 0; 1124 1125/* Set by ld emulation if --data-in-l1. */ 1126bfd_boolean elf32_bfin_data_in_l1 = 0; 1127 1128static void 1129elf32_bfin_final_write_processing (bfd *abfd, 1130 bfd_boolean linker ATTRIBUTE_UNUSED) 1131{ 1132 if (elf32_bfin_code_in_l1) 1133 elf_elfheader (abfd)->e_flags |= EF_BFIN_CODE_IN_L1; 1134 if (elf32_bfin_data_in_l1) 1135 elf_elfheader (abfd)->e_flags |= EF_BFIN_DATA_IN_L1; 1136} 1137 1138/* Return TRUE if the name is a local label. 1139 bfin local labels begin with L$. */ 1140static bfd_boolean 1141bfin_is_local_label_name (bfd *abfd, const char *label) 1142{ 1143 if (label[0] == 'L' && label[1] == '$' ) 1144 return TRUE; 1145 1146 return _bfd_elf_is_local_label_name (abfd, label); 1147} 1148 1149/* Look through the relocs for a section during the first phase, and 1150 allocate space in the global offset table or procedure linkage 1151 table. */ 1152 1153static bfd_boolean 1154bfin_check_relocs (bfd * abfd, 1155 struct bfd_link_info *info, 1156 asection *sec, 1157 const Elf_Internal_Rela *relocs) 1158{ 1159 bfd *dynobj; 1160 Elf_Internal_Shdr *symtab_hdr; 1161 struct elf_link_hash_entry **sym_hashes; 1162 bfd_signed_vma *local_got_refcounts; 1163 const Elf_Internal_Rela *rel; 1164 const Elf_Internal_Rela *rel_end; 1165 asection *sgot; 1166 asection *srelgot; 1167 1168 if (bfd_link_relocatable (info)) 1169 return TRUE; 1170 1171 dynobj = elf_hash_table (info)->dynobj; 1172 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1173 sym_hashes = elf_sym_hashes (abfd); 1174 local_got_refcounts = elf_local_got_refcounts (abfd); 1175 1176 sgot = NULL; 1177 srelgot = NULL; 1178 1179 rel_end = relocs + sec->reloc_count; 1180 for (rel = relocs; rel < rel_end; rel++) 1181 { 1182 unsigned long r_symndx; 1183 struct elf_link_hash_entry *h; 1184 1185 r_symndx = ELF32_R_SYM (rel->r_info); 1186 if (r_symndx < symtab_hdr->sh_info) 1187 h = NULL; 1188 else 1189 { 1190 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1191 1192 /* PR15323, ref flags aren't set for references in the same 1193 object. */ 1194 h->root.non_ir_ref = 1; 1195 } 1196 1197 switch (ELF32_R_TYPE (rel->r_info)) 1198 { 1199 /* This relocation describes the C++ object vtable hierarchy. 1200 Reconstruct it for later use during GC. */ 1201 case R_BFIN_GNU_VTINHERIT: 1202 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1203 return FALSE; 1204 break; 1205 1206 /* This relocation describes which C++ vtable entries 1207 are actually used. Record for later use during GC. */ 1208 case R_BFIN_GNU_VTENTRY: 1209 BFD_ASSERT (h != NULL); 1210 if (h != NULL 1211 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1212 return FALSE; 1213 break; 1214 1215 case R_BFIN_GOT: 1216 if (h != NULL 1217 && strcmp (h->root.root.string, "__GLOBAL_OFFSET_TABLE_") == 0) 1218 break; 1219 /* Fall through. */ 1220 1221 if (dynobj == NULL) 1222 { 1223 /* Create the .got section. */ 1224 elf_hash_table (info)->dynobj = dynobj = abfd; 1225 if (!_bfd_elf_create_got_section (dynobj, info)) 1226 return FALSE; 1227 } 1228 1229 sgot = elf_hash_table (info)->sgot; 1230 srelgot = elf_hash_table (info)->srelgot; 1231 BFD_ASSERT (sgot != NULL); 1232 1233 if (h != NULL) 1234 { 1235 if (h->got.refcount == 0) 1236 { 1237 /* Make sure this symbol is output as a dynamic symbol. */ 1238 if (h->dynindx == -1 && !h->forced_local) 1239 { 1240 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 1241 return FALSE; 1242 } 1243 1244 /* Allocate space in the .got section. */ 1245 sgot->size += 4; 1246 /* Allocate relocation space. */ 1247 srelgot->size += sizeof (Elf32_External_Rela); 1248 } 1249 h->got.refcount++; 1250 } 1251 else 1252 { 1253 /* This is a global offset table entry for a local symbol. */ 1254 if (local_got_refcounts == NULL) 1255 { 1256 bfd_size_type size; 1257 1258 size = symtab_hdr->sh_info; 1259 size *= sizeof (bfd_signed_vma); 1260 local_got_refcounts = ((bfd_signed_vma *) 1261 bfd_zalloc (abfd, size)); 1262 if (local_got_refcounts == NULL) 1263 return FALSE; 1264 elf_local_got_refcounts (abfd) = local_got_refcounts; 1265 } 1266 if (local_got_refcounts[r_symndx] == 0) 1267 { 1268 sgot->size += 4; 1269 if (bfd_link_pic (info)) 1270 { 1271 /* If we are generating a shared object, we need to 1272 output a R_68K_RELATIVE reloc so that the dynamic 1273 linker can adjust this GOT entry. */ 1274 srelgot->size += sizeof (Elf32_External_Rela); 1275 } 1276 } 1277 local_got_refcounts[r_symndx]++; 1278 } 1279 break; 1280 1281 default: 1282 break; 1283 } 1284 } 1285 1286 return TRUE; 1287} 1288 1289static enum elf_reloc_type_class 1290elf32_bfin_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 1291 const asection *rel_sec ATTRIBUTE_UNUSED, 1292 const Elf_Internal_Rela * rela) 1293{ 1294 switch ((int) ELF32_R_TYPE (rela->r_info)) 1295 { 1296 default: 1297 return reloc_class_normal; 1298 } 1299} 1300 1301static bfd_reloc_status_type 1302bfin_final_link_relocate (Elf_Internal_Rela *rel, reloc_howto_type *howto, 1303 bfd *input_bfd, asection *input_section, 1304 bfd_byte *contents, bfd_vma address, 1305 bfd_vma value, bfd_vma addend) 1306{ 1307 int r_type = ELF32_R_TYPE (rel->r_info); 1308 1309 if (r_type == R_BFIN_PCREL24 || r_type == R_BFIN_PCREL24_JUMP_L) 1310 { 1311 bfd_reloc_status_type r = bfd_reloc_ok; 1312 bfd_vma x; 1313 1314 if (address > bfd_get_section_limit (input_bfd, input_section)) 1315 return bfd_reloc_outofrange; 1316 1317 value += addend; 1318 1319 /* Perform usual pc-relative correction. */ 1320 value -= input_section->output_section->vma + input_section->output_offset; 1321 value -= address; 1322 1323 /* We are getting reloc_entry->address 2 byte off from 1324 the start of instruction. Assuming absolute postion 1325 of the reloc data. But, following code had been written assuming 1326 reloc address is starting at begining of instruction. 1327 To compensate that I have increased the value of 1328 relocation by 1 (effectively 2) and used the addr -2 instead of addr. */ 1329 1330 value += 2; 1331 address -= 2; 1332 1333 if ((value & 0xFF000000) != 0 1334 && (value & 0xFF000000) != 0xFF000000) 1335 r = bfd_reloc_overflow; 1336 1337 value >>= 1; 1338 1339 x = bfd_get_16 (input_bfd, contents + address); 1340 x = (x & 0xff00) | ((value >> 16) & 0xff); 1341 bfd_put_16 (input_bfd, x, contents + address); 1342 1343 x = bfd_get_16 (input_bfd, contents + address + 2); 1344 x = value & 0xFFFF; 1345 bfd_put_16 (input_bfd, x, contents + address + 2); 1346 return r; 1347 } 1348 1349 return _bfd_final_link_relocate (howto, input_bfd, input_section, contents, 1350 rel->r_offset, value, addend); 1351 1352} 1353 1354static bfd_boolean 1355bfin_relocate_section (bfd * output_bfd, 1356 struct bfd_link_info *info, 1357 bfd * input_bfd, 1358 asection * input_section, 1359 bfd_byte * contents, 1360 Elf_Internal_Rela * relocs, 1361 Elf_Internal_Sym * local_syms, 1362 asection ** local_sections) 1363{ 1364 bfd *dynobj; 1365 Elf_Internal_Shdr *symtab_hdr; 1366 struct elf_link_hash_entry **sym_hashes; 1367 bfd_vma *local_got_offsets; 1368 asection *sgot; 1369 Elf_Internal_Rela *rel; 1370 Elf_Internal_Rela *relend; 1371 int i = 0; 1372 1373 dynobj = elf_hash_table (info)->dynobj; 1374 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1375 sym_hashes = elf_sym_hashes (input_bfd); 1376 local_got_offsets = elf_local_got_offsets (input_bfd); 1377 1378 sgot = NULL; 1379 1380 rel = relocs; 1381 relend = relocs + input_section->reloc_count; 1382 for (; rel < relend; rel++, i++) 1383 { 1384 int r_type; 1385 reloc_howto_type *howto; 1386 unsigned long r_symndx; 1387 struct elf_link_hash_entry *h; 1388 Elf_Internal_Sym *sym; 1389 asection *sec; 1390 bfd_vma relocation = 0; 1391 bfd_boolean unresolved_reloc; 1392 bfd_reloc_status_type r; 1393 bfd_vma address; 1394 1395 r_type = ELF32_R_TYPE (rel->r_info); 1396 if (r_type < 0 || r_type >= 243) 1397 { 1398 bfd_set_error (bfd_error_bad_value); 1399 return FALSE; 1400 } 1401 1402 if (r_type == R_BFIN_GNU_VTENTRY 1403 || r_type == R_BFIN_GNU_VTINHERIT) 1404 continue; 1405 1406 howto = bfin_reloc_type_lookup (input_bfd, r_type); 1407 if (howto == NULL) 1408 { 1409 bfd_set_error (bfd_error_bad_value); 1410 return FALSE; 1411 } 1412 r_symndx = ELF32_R_SYM (rel->r_info); 1413 1414 h = NULL; 1415 sym = NULL; 1416 sec = NULL; 1417 unresolved_reloc = FALSE; 1418 1419 if (r_symndx < symtab_hdr->sh_info) 1420 { 1421 sym = local_syms + r_symndx; 1422 sec = local_sections[r_symndx]; 1423 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1424 } 1425 else 1426 { 1427 bfd_boolean warned, ignored; 1428 1429 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1430 r_symndx, symtab_hdr, sym_hashes, 1431 h, sec, relocation, 1432 unresolved_reloc, warned, ignored); 1433 } 1434 1435 if (sec != NULL && discarded_section (sec)) 1436 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1437 rel, 1, relend, howto, 0, contents); 1438 1439 if (bfd_link_relocatable (info)) 1440 continue; 1441 1442 address = rel->r_offset; 1443 1444 /* Then, process normally. */ 1445 switch (r_type) 1446 { 1447 case R_BFIN_GNU_VTINHERIT: 1448 case R_BFIN_GNU_VTENTRY: 1449 return bfd_reloc_ok; 1450 1451 case R_BFIN_GOT: 1452 /* Relocation is to the address of the entry for this symbol 1453 in the global offset table. */ 1454 if (h != NULL 1455 && strcmp (h->root.root.string, "__GLOBAL_OFFSET_TABLE_") == 0) 1456 goto do_default; 1457 /* Fall through. */ 1458 /* Relocation is the offset of the entry for this symbol in 1459 the global offset table. */ 1460 1461 { 1462 bfd_vma off; 1463 1464 if (dynobj == NULL) 1465 { 1466 /* Create the .got section. */ 1467 elf_hash_table (info)->dynobj = dynobj = output_bfd; 1468 if (!_bfd_elf_create_got_section (dynobj, info)) 1469 return FALSE; 1470 } 1471 1472 sgot = elf_hash_table (info)->sgot; 1473 BFD_ASSERT (sgot != NULL); 1474 1475 if (h != NULL) 1476 { 1477 bfd_boolean dyn; 1478 1479 off = h->got.offset; 1480 BFD_ASSERT (off != (bfd_vma) - 1); 1481 dyn = elf_hash_table (info)->dynamic_sections_created; 1482 1483 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 1484 bfd_link_pic (info), 1485 h) 1486 || (bfd_link_pic (info) 1487 && (info->symbolic 1488 || h->dynindx == -1 1489 || h->forced_local) 1490 && h->def_regular)) 1491 { 1492 /* This is actually a static link, or it is a 1493 -Bsymbolic link and the symbol is defined 1494 locally, or the symbol was forced to be local 1495 because of a version file.. We must initialize 1496 this entry in the global offset table. Since 1497 the offset must always be a multiple of 4, we 1498 use the least significant bit to record whether 1499 we have initialized it already. 1500 1501 When doing a dynamic link, we create a .rela.got 1502 relocation entry to initialize the value. This 1503 is done in the finish_dynamic_symbol routine. */ 1504 if ((off & 1) != 0) 1505 off &= ~1; 1506 else 1507 { 1508 bfd_put_32 (output_bfd, relocation, 1509 sgot->contents + off); 1510 h->got.offset |= 1; 1511 } 1512 } 1513 else 1514 unresolved_reloc = FALSE; 1515 } 1516 else 1517 { 1518 BFD_ASSERT (local_got_offsets != NULL); 1519 off = local_got_offsets[r_symndx]; 1520 BFD_ASSERT (off != (bfd_vma) - 1); 1521 1522 /* The offset must always be a multiple of 4. We use 1523 the least significant bit to record whether we have 1524 already generated the necessary reloc. */ 1525 if ((off & 1) != 0) 1526 off &= ~1; 1527 else 1528 { 1529 bfd_put_32 (output_bfd, relocation, sgot->contents + off); 1530 1531 if (bfd_link_pic (info)) 1532 { 1533 asection *s; 1534 Elf_Internal_Rela outrel; 1535 bfd_byte *loc; 1536 1537 s = elf_hash_table (info)->srelgot; 1538 BFD_ASSERT (s != NULL); 1539 1540 outrel.r_offset = (sgot->output_section->vma 1541 + sgot->output_offset + off); 1542 outrel.r_info = 1543 ELF32_R_INFO (0, R_BFIN_PCREL24); 1544 outrel.r_addend = relocation; 1545 loc = s->contents; 1546 loc += 1547 s->reloc_count++ * sizeof (Elf32_External_Rela); 1548 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1549 } 1550 1551 local_got_offsets[r_symndx] |= 1; 1552 } 1553 } 1554 1555 relocation = sgot->output_offset + off; 1556 rel->r_addend = 0; 1557 /* bfin : preg = [preg + 17bitdiv4offset] relocation is div by 4. */ 1558 relocation /= 4; 1559 } 1560 goto do_default; 1561 1562 default: 1563 do_default: 1564 r = bfin_final_link_relocate (rel, howto, input_bfd, input_section, 1565 contents, address, 1566 relocation, rel->r_addend); 1567 1568 break; 1569 } 1570 1571 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 1572 because such sections are not SEC_ALLOC and thus ld.so will 1573 not process them. */ 1574 if (unresolved_reloc 1575 && !((input_section->flags & SEC_DEBUGGING) != 0 && h->def_dynamic) 1576 && _bfd_elf_section_offset (output_bfd, info, input_section, 1577 rel->r_offset) != (bfd_vma) -1) 1578 { 1579 _bfd_error_handler 1580 /* xgettext:c-format */ 1581 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"), 1582 input_bfd, 1583 input_section, (long) rel->r_offset, h->root.root.string); 1584 return FALSE; 1585 } 1586 1587 if (r != bfd_reloc_ok) 1588 { 1589 const char *name; 1590 1591 if (h != NULL) 1592 name = h->root.root.string; 1593 else 1594 { 1595 name = bfd_elf_string_from_elf_section (input_bfd, 1596 symtab_hdr->sh_link, 1597 sym->st_name); 1598 if (name == NULL) 1599 return FALSE; 1600 if (*name == '\0') 1601 name = bfd_section_name (input_bfd, sec); 1602 } 1603 1604 if (r == bfd_reloc_overflow) 1605 (*info->callbacks->reloc_overflow) 1606 (info, (h ? &h->root : NULL), name, howto->name, 1607 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1608 else 1609 { 1610 _bfd_error_handler 1611 /* xgettext:c-format */ 1612 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 1613 input_bfd, input_section, 1614 (long) rel->r_offset, name, (int) r); 1615 return FALSE; 1616 } 1617 } 1618 } 1619 1620 return TRUE; 1621} 1622 1623static asection * 1624bfin_gc_mark_hook (asection * sec, 1625 struct bfd_link_info *info, 1626 Elf_Internal_Rela * rel, 1627 struct elf_link_hash_entry *h, 1628 Elf_Internal_Sym * sym) 1629{ 1630 if (h != NULL) 1631 switch (ELF32_R_TYPE (rel->r_info)) 1632 { 1633 case R_BFIN_GNU_VTINHERIT: 1634 case R_BFIN_GNU_VTENTRY: 1635 return NULL; 1636 } 1637 1638 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1639} 1640 1641/* Update the got entry reference counts for the section being removed. */ 1642 1643static bfd_boolean 1644bfin_gc_sweep_hook (bfd * abfd, 1645 struct bfd_link_info *info, 1646 asection * sec, 1647 const Elf_Internal_Rela * relocs) 1648{ 1649 Elf_Internal_Shdr *symtab_hdr; 1650 struct elf_link_hash_entry **sym_hashes; 1651 bfd_signed_vma *local_got_refcounts; 1652 const Elf_Internal_Rela *rel, *relend; 1653 bfd *dynobj; 1654 asection *sgot; 1655 asection *srelgot; 1656 1657 dynobj = elf_hash_table (info)->dynobj; 1658 if (dynobj == NULL) 1659 return TRUE; 1660 1661 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1662 sym_hashes = elf_sym_hashes (abfd); 1663 local_got_refcounts = elf_local_got_refcounts (abfd); 1664 1665 sgot = elf_hash_table (info)->sgot; 1666 srelgot = elf_hash_table (info)->srelgot; 1667 1668 relend = relocs + sec->reloc_count; 1669 for (rel = relocs; rel < relend; rel++) 1670 { 1671 unsigned long r_symndx; 1672 struct elf_link_hash_entry *h; 1673 1674 switch (ELF32_R_TYPE (rel->r_info)) 1675 { 1676 case R_BFIN_GOT: 1677 r_symndx = ELF32_R_SYM (rel->r_info); 1678 if (r_symndx >= symtab_hdr->sh_info) 1679 { 1680 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1681 if (h->got.refcount > 0) 1682 { 1683 --h->got.refcount; 1684 if (h->got.refcount == 0) 1685 { 1686 /* We don't need the .got entry any more. */ 1687 sgot->size -= 4; 1688 srelgot->size -= sizeof (Elf32_External_Rela); 1689 } 1690 } 1691 } 1692 else if (local_got_refcounts != NULL) 1693 { 1694 if (local_got_refcounts[r_symndx] > 0) 1695 { 1696 --local_got_refcounts[r_symndx]; 1697 if (local_got_refcounts[r_symndx] == 0) 1698 { 1699 /* We don't need the .got entry any more. */ 1700 sgot->size -= 4; 1701 if (bfd_link_pic (info)) 1702 srelgot->size -= sizeof (Elf32_External_Rela); 1703 } 1704 } 1705 } 1706 break; 1707 default: 1708 break; 1709 } 1710 } 1711 return TRUE; 1712} 1713 1714extern const bfd_target bfin_elf32_fdpic_vec; 1715#define IS_FDPIC(bfd) ((bfd)->xvec == &bfin_elf32_fdpic_vec) 1716 1717/* An extension of the elf hash table data structure, 1718 containing some additional Blackfin-specific data. */ 1719struct bfinfdpic_elf_link_hash_table 1720{ 1721 struct elf_link_hash_table elf; 1722 1723 /* A pointer to the .rofixup section. */ 1724 asection *sgotfixup; 1725 /* GOT base offset. */ 1726 bfd_vma got0; 1727 /* Location of the first non-lazy PLT entry, i.e., the number of 1728 bytes taken by lazy PLT entries. */ 1729 bfd_vma plt0; 1730 /* A hash table holding information about which symbols were 1731 referenced with which PIC-related relocations. */ 1732 struct htab *relocs_info; 1733 /* Summary reloc information collected by 1734 _bfinfdpic_count_got_plt_entries. */ 1735 struct _bfinfdpic_dynamic_got_info *g; 1736}; 1737 1738/* Get the Blackfin ELF linker hash table from a link_info structure. */ 1739 1740#define bfinfdpic_hash_table(info) \ 1741 (elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \ 1742 == BFIN_ELF_DATA ? ((struct bfinfdpic_elf_link_hash_table *) ((info)->hash)) : NULL) 1743 1744#define bfinfdpic_got_section(info) \ 1745 (bfinfdpic_hash_table (info)->elf.sgot) 1746#define bfinfdpic_gotrel_section(info) \ 1747 (bfinfdpic_hash_table (info)->elf.srelgot) 1748#define bfinfdpic_gotfixup_section(info) \ 1749 (bfinfdpic_hash_table (info)->sgotfixup) 1750#define bfinfdpic_plt_section(info) \ 1751 (bfinfdpic_hash_table (info)->elf.splt) 1752#define bfinfdpic_pltrel_section(info) \ 1753 (bfinfdpic_hash_table (info)->elf.srelplt) 1754#define bfinfdpic_relocs_info(info) \ 1755 (bfinfdpic_hash_table (info)->relocs_info) 1756#define bfinfdpic_got_initial_offset(info) \ 1757 (bfinfdpic_hash_table (info)->got0) 1758#define bfinfdpic_plt_initial_offset(info) \ 1759 (bfinfdpic_hash_table (info)->plt0) 1760#define bfinfdpic_dynamic_got_plt_info(info) \ 1761 (bfinfdpic_hash_table (info)->g) 1762 1763/* The name of the dynamic interpreter. This is put in the .interp 1764 section. */ 1765 1766#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" 1767 1768#define DEFAULT_STACK_SIZE 0x20000 1769 1770/* This structure is used to collect the number of entries present in 1771 each addressable range of the got. */ 1772struct _bfinfdpic_dynamic_got_info 1773{ 1774 /* Several bits of information about the current link. */ 1775 struct bfd_link_info *info; 1776 /* Total size needed for GOT entries within the 18- or 32-bit 1777 ranges. */ 1778 bfd_vma got17m4, gothilo; 1779 /* Total size needed for function descriptor entries within the 18- 1780 or 32-bit ranges. */ 1781 bfd_vma fd17m4, fdhilo; 1782 /* Total size needed function descriptor entries referenced in PLT 1783 entries, that would be profitable to place in offsets close to 1784 the PIC register. */ 1785 bfd_vma fdplt; 1786 /* Total size needed by lazy PLT entries. */ 1787 bfd_vma lzplt; 1788 /* Number of relocations carried over from input object files. */ 1789 unsigned long relocs; 1790 /* Number of fixups introduced by relocations in input object files. */ 1791 unsigned long fixups; 1792}; 1793 1794/* Create a Blackfin ELF linker hash table. */ 1795 1796static struct bfd_link_hash_table * 1797bfinfdpic_elf_link_hash_table_create (bfd *abfd) 1798{ 1799 struct bfinfdpic_elf_link_hash_table *ret; 1800 bfd_size_type amt = sizeof (struct bfinfdpic_elf_link_hash_table); 1801 1802 ret = bfd_zmalloc (amt); 1803 if (ret == NULL) 1804 return NULL; 1805 1806 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, 1807 _bfd_elf_link_hash_newfunc, 1808 sizeof (struct elf_link_hash_entry), 1809 BFIN_ELF_DATA)) 1810 { 1811 free (ret); 1812 return NULL; 1813 } 1814 1815 return &ret->elf.root; 1816} 1817 1818/* Decide whether a reference to a symbol can be resolved locally or 1819 not. If the symbol is protected, we want the local address, but 1820 its function descriptor must be assigned by the dynamic linker. */ 1821#define BFINFDPIC_SYM_LOCAL(INFO, H) \ 1822 (_bfd_elf_symbol_refs_local_p ((H), (INFO), 1) \ 1823 || ! elf_hash_table (INFO)->dynamic_sections_created) 1824#define BFINFDPIC_FUNCDESC_LOCAL(INFO, H) \ 1825 ((H)->dynindx == -1 || ! elf_hash_table (INFO)->dynamic_sections_created) 1826 1827/* This structure collects information on what kind of GOT, PLT or 1828 function descriptors are required by relocations that reference a 1829 certain symbol. */ 1830struct bfinfdpic_relocs_info 1831{ 1832 /* The index of the symbol, as stored in the relocation r_info, if 1833 we have a local symbol; -1 otherwise. */ 1834 long symndx; 1835 union 1836 { 1837 /* The input bfd in which the symbol is defined, if it's a local 1838 symbol. */ 1839 bfd *abfd; 1840 /* If symndx == -1, the hash table entry corresponding to a global 1841 symbol (even if it turns out to bind locally, in which case it 1842 should ideally be replaced with section's symndx + addend). */ 1843 struct elf_link_hash_entry *h; 1844 } d; 1845 /* The addend of the relocation that references the symbol. */ 1846 bfd_vma addend; 1847 1848 /* The fields above are used to identify an entry. The fields below 1849 contain information on how an entry is used and, later on, which 1850 locations it was assigned. */ 1851 /* The following 2 fields record whether the symbol+addend above was 1852 ever referenced with a GOT relocation. The 17M4 suffix indicates a 1853 GOT17M4 relocation; hilo is used for GOTLO/GOTHI pairs. */ 1854 unsigned got17m4; 1855 unsigned gothilo; 1856 /* Whether a FUNCDESC relocation references symbol+addend. */ 1857 unsigned fd; 1858 /* Whether a FUNCDESC_GOT relocation references symbol+addend. */ 1859 unsigned fdgot17m4; 1860 unsigned fdgothilo; 1861 /* Whether a FUNCDESC_GOTOFF relocation references symbol+addend. */ 1862 unsigned fdgoff17m4; 1863 unsigned fdgoffhilo; 1864 /* Whether symbol+addend is referenced with GOTOFF17M4, GOTOFFLO or 1865 GOTOFFHI relocations. The addend doesn't really matter, since we 1866 envision that this will only be used to check whether the symbol 1867 is mapped to the same segment as the got. */ 1868 unsigned gotoff; 1869 /* Whether symbol+addend is referenced by a LABEL24 relocation. */ 1870 unsigned call; 1871 /* Whether symbol+addend is referenced by a 32 or FUNCDESC_VALUE 1872 relocation. */ 1873 unsigned sym; 1874 /* Whether we need a PLT entry for a symbol. Should be implied by 1875 something like: 1876 (call && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h)) */ 1877 unsigned plt:1; 1878 /* Whether a function descriptor should be created in this link unit 1879 for symbol+addend. Should be implied by something like: 1880 (plt || fdgotoff17m4 || fdgotofflohi 1881 || ((fd || fdgot17m4 || fdgothilo) 1882 && (symndx != -1 || BFINFDPIC_FUNCDESC_LOCAL (info, d.h)))) */ 1883 unsigned privfd:1; 1884 /* Whether a lazy PLT entry is needed for this symbol+addend. 1885 Should be implied by something like: 1886 (privfd && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h) 1887 && ! (info->flags & DF_BIND_NOW)) */ 1888 unsigned lazyplt:1; 1889 /* Whether we've already emitted GOT relocations and PLT entries as 1890 needed for this symbol. */ 1891 unsigned done:1; 1892 1893 /* The number of R_BFIN_BYTE4_DATA, R_BFIN_FUNCDESC and R_BFIN_FUNCDESC_VALUE 1894 relocations referencing the symbol. */ 1895 unsigned relocs32, relocsfd, relocsfdv; 1896 1897 /* The number of .rofixups entries and dynamic relocations allocated 1898 for this symbol, minus any that might have already been used. */ 1899 unsigned fixups, dynrelocs; 1900 1901 /* The offsets of the GOT entries assigned to symbol+addend, to the 1902 function descriptor's address, and to a function descriptor, 1903 respectively. Should be zero if unassigned. The offsets are 1904 counted from the value that will be assigned to the PIC register, 1905 not from the beginning of the .got section. */ 1906 bfd_signed_vma got_entry, fdgot_entry, fd_entry; 1907 /* The offsets of the PLT entries assigned to symbol+addend, 1908 non-lazy and lazy, respectively. If unassigned, should be 1909 (bfd_vma)-1. */ 1910 bfd_vma plt_entry, lzplt_entry; 1911}; 1912 1913/* Compute a hash with the key fields of an bfinfdpic_relocs_info entry. */ 1914static hashval_t 1915bfinfdpic_relocs_info_hash (const void *entry_) 1916{ 1917 const struct bfinfdpic_relocs_info *entry = entry_; 1918 1919 return (entry->symndx == -1 1920 ? (long) entry->d.h->root.root.hash 1921 : entry->symndx + (long) entry->d.abfd->id * 257) + entry->addend; 1922} 1923 1924/* Test whether the key fields of two bfinfdpic_relocs_info entries are 1925 identical. */ 1926static int 1927bfinfdpic_relocs_info_eq (const void *entry1, const void *entry2) 1928{ 1929 const struct bfinfdpic_relocs_info *e1 = entry1; 1930 const struct bfinfdpic_relocs_info *e2 = entry2; 1931 1932 return e1->symndx == e2->symndx && e1->addend == e2->addend 1933 && (e1->symndx == -1 ? e1->d.h == e2->d.h : e1->d.abfd == e2->d.abfd); 1934} 1935 1936/* Find or create an entry in a hash table HT that matches the key 1937 fields of the given ENTRY. If it's not found, memory for a new 1938 entry is allocated in ABFD's obstack. */ 1939static struct bfinfdpic_relocs_info * 1940bfinfdpic_relocs_info_find (struct htab *ht, 1941 bfd *abfd, 1942 const struct bfinfdpic_relocs_info *entry, 1943 enum insert_option insert) 1944{ 1945 struct bfinfdpic_relocs_info **loc; 1946 1947 if (!ht) 1948 return NULL; 1949 1950 loc = (struct bfinfdpic_relocs_info **) htab_find_slot (ht, entry, insert); 1951 1952 if (! loc) 1953 return NULL; 1954 1955 if (*loc) 1956 return *loc; 1957 1958 *loc = bfd_zalloc (abfd, sizeof (**loc)); 1959 1960 if (! *loc) 1961 return *loc; 1962 1963 (*loc)->symndx = entry->symndx; 1964 (*loc)->d = entry->d; 1965 (*loc)->addend = entry->addend; 1966 (*loc)->plt_entry = (bfd_vma)-1; 1967 (*loc)->lzplt_entry = (bfd_vma)-1; 1968 1969 return *loc; 1970} 1971 1972/* Obtain the address of the entry in HT associated with H's symbol + 1973 addend, creating a new entry if none existed. ABFD is only used 1974 for memory allocation purposes. */ 1975inline static struct bfinfdpic_relocs_info * 1976bfinfdpic_relocs_info_for_global (struct htab *ht, 1977 bfd *abfd, 1978 struct elf_link_hash_entry *h, 1979 bfd_vma addend, 1980 enum insert_option insert) 1981{ 1982 struct bfinfdpic_relocs_info entry; 1983 1984 entry.symndx = -1; 1985 entry.d.h = h; 1986 entry.addend = addend; 1987 1988 return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert); 1989} 1990 1991/* Obtain the address of the entry in HT associated with the SYMNDXth 1992 local symbol of the input bfd ABFD, plus the addend, creating a new 1993 entry if none existed. */ 1994inline static struct bfinfdpic_relocs_info * 1995bfinfdpic_relocs_info_for_local (struct htab *ht, 1996 bfd *abfd, 1997 long symndx, 1998 bfd_vma addend, 1999 enum insert_option insert) 2000{ 2001 struct bfinfdpic_relocs_info entry; 2002 2003 entry.symndx = symndx; 2004 entry.d.abfd = abfd; 2005 entry.addend = addend; 2006 2007 return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert); 2008} 2009 2010/* Merge fields set by check_relocs() of two entries that end up being 2011 mapped to the same (presumably global) symbol. */ 2012 2013inline static void 2014bfinfdpic_pic_merge_early_relocs_info (struct bfinfdpic_relocs_info *e2, 2015 struct bfinfdpic_relocs_info const *e1) 2016{ 2017 e2->got17m4 |= e1->got17m4; 2018 e2->gothilo |= e1->gothilo; 2019 e2->fd |= e1->fd; 2020 e2->fdgot17m4 |= e1->fdgot17m4; 2021 e2->fdgothilo |= e1->fdgothilo; 2022 e2->fdgoff17m4 |= e1->fdgoff17m4; 2023 e2->fdgoffhilo |= e1->fdgoffhilo; 2024 e2->gotoff |= e1->gotoff; 2025 e2->call |= e1->call; 2026 e2->sym |= e1->sym; 2027} 2028 2029/* Every block of 65535 lazy PLT entries shares a single call to the 2030 resolver, inserted in the 32768th lazy PLT entry (i.e., entry # 2031 32767, counting from 0). All other lazy PLT entries branch to it 2032 in a single instruction. */ 2033 2034#define LZPLT_RESOLVER_EXTRA 10 2035#define LZPLT_NORMAL_SIZE 6 2036#define LZPLT_ENTRIES 1362 2037 2038#define BFINFDPIC_LZPLT_BLOCK_SIZE ((bfd_vma) LZPLT_NORMAL_SIZE * LZPLT_ENTRIES + LZPLT_RESOLVER_EXTRA) 2039#define BFINFDPIC_LZPLT_RESOLV_LOC (LZPLT_NORMAL_SIZE * LZPLT_ENTRIES / 2) 2040 2041/* Add a dynamic relocation to the SRELOC section. */ 2042 2043inline static bfd_vma 2044_bfinfdpic_add_dyn_reloc (bfd *output_bfd, asection *sreloc, bfd_vma offset, 2045 int reloc_type, long dynindx, bfd_vma addend, 2046 struct bfinfdpic_relocs_info *entry) 2047{ 2048 Elf_Internal_Rela outrel; 2049 bfd_vma reloc_offset; 2050 2051 outrel.r_offset = offset; 2052 outrel.r_info = ELF32_R_INFO (dynindx, reloc_type); 2053 outrel.r_addend = addend; 2054 2055 reloc_offset = sreloc->reloc_count * sizeof (Elf32_External_Rel); 2056 BFD_ASSERT (reloc_offset < sreloc->size); 2057 bfd_elf32_swap_reloc_out (output_bfd, &outrel, 2058 sreloc->contents + reloc_offset); 2059 sreloc->reloc_count++; 2060 2061 /* If the entry's index is zero, this relocation was probably to a 2062 linkonce section that got discarded. We reserved a dynamic 2063 relocation, but it was for another entry than the one we got at 2064 the time of emitting the relocation. Unfortunately there's no 2065 simple way for us to catch this situation, since the relocation 2066 is cleared right before calling relocate_section, at which point 2067 we no longer know what the relocation used to point to. */ 2068 if (entry->symndx) 2069 { 2070 BFD_ASSERT (entry->dynrelocs > 0); 2071 entry->dynrelocs--; 2072 } 2073 2074 return reloc_offset; 2075} 2076 2077/* Add a fixup to the ROFIXUP section. */ 2078 2079static bfd_vma 2080_bfinfdpic_add_rofixup (bfd *output_bfd, asection *rofixup, bfd_vma offset, 2081 struct bfinfdpic_relocs_info *entry) 2082{ 2083 bfd_vma fixup_offset; 2084 2085 if (rofixup->flags & SEC_EXCLUDE) 2086 return -1; 2087 2088 fixup_offset = rofixup->reloc_count * 4; 2089 if (rofixup->contents) 2090 { 2091 BFD_ASSERT (fixup_offset < rofixup->size); 2092 bfd_put_32 (output_bfd, offset, rofixup->contents + fixup_offset); 2093 } 2094 rofixup->reloc_count++; 2095 2096 if (entry && entry->symndx) 2097 { 2098 /* See discussion about symndx == 0 in _bfinfdpic_add_dyn_reloc 2099 above. */ 2100 BFD_ASSERT (entry->fixups > 0); 2101 entry->fixups--; 2102 } 2103 2104 return fixup_offset; 2105} 2106 2107/* Find the segment number in which OSEC, and output section, is 2108 located. */ 2109 2110static unsigned 2111_bfinfdpic_osec_to_segment (bfd *output_bfd, asection *osec) 2112{ 2113 Elf_Internal_Phdr *p = _bfd_elf_find_segment_containing_section (output_bfd, osec); 2114 2115 return (p != NULL) ? p - elf_tdata (output_bfd)->phdr : -1; 2116} 2117 2118inline static bfd_boolean 2119_bfinfdpic_osec_readonly_p (bfd *output_bfd, asection *osec) 2120{ 2121 unsigned seg = _bfinfdpic_osec_to_segment (output_bfd, osec); 2122 2123 return ! (elf_tdata (output_bfd)->phdr[seg].p_flags & PF_W); 2124} 2125 2126/* Generate relocations for GOT entries, function descriptors, and 2127 code for PLT and lazy PLT entries. */ 2128 2129inline static bfd_boolean 2130_bfinfdpic_emit_got_relocs_plt_entries (struct bfinfdpic_relocs_info *entry, 2131 bfd *output_bfd, 2132 struct bfd_link_info *info, 2133 asection *sec, 2134 Elf_Internal_Sym *sym, 2135 bfd_vma addend) 2136{ 2137 bfd_vma fd_lazy_rel_offset = (bfd_vma) -1; 2138 int dynindx = -1; 2139 2140 if (entry->done) 2141 return TRUE; 2142 entry->done = 1; 2143 2144 if (entry->got_entry || entry->fdgot_entry || entry->fd_entry) 2145 { 2146 /* If the symbol is dynamic, consider it for dynamic 2147 relocations, otherwise decay to section + offset. */ 2148 if (entry->symndx == -1 && entry->d.h->dynindx != -1) 2149 dynindx = entry->d.h->dynindx; 2150 else 2151 { 2152 if (sec 2153 && sec->output_section 2154 && ! bfd_is_abs_section (sec->output_section) 2155 && ! bfd_is_und_section (sec->output_section)) 2156 dynindx = elf_section_data (sec->output_section)->dynindx; 2157 else 2158 dynindx = 0; 2159 } 2160 } 2161 2162 /* Generate relocation for GOT entry pointing to the symbol. */ 2163 if (entry->got_entry) 2164 { 2165 int idx = dynindx; 2166 bfd_vma ad = addend; 2167 2168 /* If the symbol is dynamic but binds locally, use 2169 section+offset. */ 2170 if (sec && (entry->symndx != -1 2171 || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) 2172 { 2173 if (entry->symndx == -1) 2174 ad += entry->d.h->root.u.def.value; 2175 else 2176 ad += sym->st_value; 2177 ad += sec->output_offset; 2178 if (sec->output_section && elf_section_data (sec->output_section)) 2179 idx = elf_section_data (sec->output_section)->dynindx; 2180 else 2181 idx = 0; 2182 } 2183 2184 /* If we're linking an executable at a fixed address, we can 2185 omit the dynamic relocation as long as the symbol is local to 2186 this module. */ 2187 if (bfd_link_pde (info) 2188 && (entry->symndx != -1 2189 || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) 2190 { 2191 if (sec) 2192 ad += sec->output_section->vma; 2193 if (entry->symndx != -1 2194 || entry->d.h->root.type != bfd_link_hash_undefweak) 2195 _bfinfdpic_add_rofixup (output_bfd, 2196 bfinfdpic_gotfixup_section (info), 2197 bfinfdpic_got_section (info)->output_section 2198 ->vma 2199 + bfinfdpic_got_section (info)->output_offset 2200 + bfinfdpic_got_initial_offset (info) 2201 + entry->got_entry, entry); 2202 } 2203 else 2204 _bfinfdpic_add_dyn_reloc (output_bfd, bfinfdpic_gotrel_section (info), 2205 _bfd_elf_section_offset 2206 (output_bfd, info, 2207 bfinfdpic_got_section (info), 2208 bfinfdpic_got_initial_offset (info) 2209 + entry->got_entry) 2210 + bfinfdpic_got_section (info) 2211 ->output_section->vma 2212 + bfinfdpic_got_section (info)->output_offset, 2213 R_BFIN_BYTE4_DATA, idx, ad, entry); 2214 2215 bfd_put_32 (output_bfd, ad, 2216 bfinfdpic_got_section (info)->contents 2217 + bfinfdpic_got_initial_offset (info) 2218 + entry->got_entry); 2219 } 2220 2221 /* Generate relocation for GOT entry pointing to a canonical 2222 function descriptor. */ 2223 if (entry->fdgot_entry) 2224 { 2225 int reloc, idx; 2226 bfd_vma ad = 0; 2227 2228 if (! (entry->symndx == -1 2229 && entry->d.h->root.type == bfd_link_hash_undefweak 2230 && BFINFDPIC_SYM_LOCAL (info, entry->d.h))) 2231 { 2232 /* If the symbol is dynamic and there may be dynamic symbol 2233 resolution because we are, or are linked with, a shared 2234 library, emit a FUNCDESC relocation such that the dynamic 2235 linker will allocate the function descriptor. If the 2236 symbol needs a non-local function descriptor but binds 2237 locally (e.g., its visibility is protected, emit a 2238 dynamic relocation decayed to section+offset. */ 2239 if (entry->symndx == -1 2240 && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h) 2241 && BFINFDPIC_SYM_LOCAL (info, entry->d.h) 2242 && !bfd_link_pde (info)) 2243 { 2244 reloc = R_BFIN_FUNCDESC; 2245 idx = elf_section_data (entry->d.h->root.u.def.section 2246 ->output_section)->dynindx; 2247 ad = entry->d.h->root.u.def.section->output_offset 2248 + entry->d.h->root.u.def.value; 2249 } 2250 else if (entry->symndx == -1 2251 && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h)) 2252 { 2253 reloc = R_BFIN_FUNCDESC; 2254 idx = dynindx; 2255 ad = addend; 2256 if (ad) 2257 return FALSE; 2258 } 2259 else 2260 { 2261 /* Otherwise, we know we have a private function descriptor, 2262 so reference it directly. */ 2263 if (elf_hash_table (info)->dynamic_sections_created) 2264 BFD_ASSERT (entry->privfd); 2265 reloc = R_BFIN_BYTE4_DATA; 2266 idx = elf_section_data (bfinfdpic_got_section (info) 2267 ->output_section)->dynindx; 2268 ad = bfinfdpic_got_section (info)->output_offset 2269 + bfinfdpic_got_initial_offset (info) + entry->fd_entry; 2270 } 2271 2272 /* If there is room for dynamic symbol resolution, emit the 2273 dynamic relocation. However, if we're linking an 2274 executable at a fixed location, we won't have emitted a 2275 dynamic symbol entry for the got section, so idx will be 2276 zero, which means we can and should compute the address 2277 of the private descriptor ourselves. */ 2278 if (bfd_link_pde (info) 2279 && (entry->symndx != -1 2280 || BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h))) 2281 { 2282 ad += bfinfdpic_got_section (info)->output_section->vma; 2283 _bfinfdpic_add_rofixup (output_bfd, 2284 bfinfdpic_gotfixup_section (info), 2285 bfinfdpic_got_section (info) 2286 ->output_section->vma 2287 + bfinfdpic_got_section (info) 2288 ->output_offset 2289 + bfinfdpic_got_initial_offset (info) 2290 + entry->fdgot_entry, entry); 2291 } 2292 else 2293 _bfinfdpic_add_dyn_reloc (output_bfd, 2294 bfinfdpic_gotrel_section (info), 2295 _bfd_elf_section_offset 2296 (output_bfd, info, 2297 bfinfdpic_got_section (info), 2298 bfinfdpic_got_initial_offset (info) 2299 + entry->fdgot_entry) 2300 + bfinfdpic_got_section (info) 2301 ->output_section->vma 2302 + bfinfdpic_got_section (info) 2303 ->output_offset, 2304 reloc, idx, ad, entry); 2305 } 2306 2307 bfd_put_32 (output_bfd, ad, 2308 bfinfdpic_got_section (info)->contents 2309 + bfinfdpic_got_initial_offset (info) 2310 + entry->fdgot_entry); 2311 } 2312 2313 /* Generate relocation to fill in a private function descriptor in 2314 the GOT. */ 2315 if (entry->fd_entry) 2316 { 2317 int idx = dynindx; 2318 bfd_vma ad = addend; 2319 bfd_vma ofst; 2320 long lowword, highword; 2321 2322 /* If the symbol is dynamic but binds locally, use 2323 section+offset. */ 2324 if (sec && (entry->symndx != -1 2325 || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) 2326 { 2327 if (entry->symndx == -1) 2328 ad += entry->d.h->root.u.def.value; 2329 else 2330 ad += sym->st_value; 2331 ad += sec->output_offset; 2332 if (sec->output_section && elf_section_data (sec->output_section)) 2333 idx = elf_section_data (sec->output_section)->dynindx; 2334 else 2335 idx = 0; 2336 } 2337 2338 /* If we're linking an executable at a fixed address, we can 2339 omit the dynamic relocation as long as the symbol is local to 2340 this module. */ 2341 if (bfd_link_pde (info) 2342 && (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (info, entry->d.h))) 2343 { 2344 if (sec) 2345 ad += sec->output_section->vma; 2346 ofst = 0; 2347 if (entry->symndx != -1 2348 || entry->d.h->root.type != bfd_link_hash_undefweak) 2349 { 2350 _bfinfdpic_add_rofixup (output_bfd, 2351 bfinfdpic_gotfixup_section (info), 2352 bfinfdpic_got_section (info) 2353 ->output_section->vma 2354 + bfinfdpic_got_section (info) 2355 ->output_offset 2356 + bfinfdpic_got_initial_offset (info) 2357 + entry->fd_entry, entry); 2358 _bfinfdpic_add_rofixup (output_bfd, 2359 bfinfdpic_gotfixup_section (info), 2360 bfinfdpic_got_section (info) 2361 ->output_section->vma 2362 + bfinfdpic_got_section (info) 2363 ->output_offset 2364 + bfinfdpic_got_initial_offset (info) 2365 + entry->fd_entry + 4, entry); 2366 } 2367 } 2368 else 2369 { 2370 ofst 2371 = _bfinfdpic_add_dyn_reloc (output_bfd, 2372 entry->lazyplt 2373 ? bfinfdpic_pltrel_section (info) 2374 : bfinfdpic_gotrel_section (info), 2375 _bfd_elf_section_offset 2376 (output_bfd, info, 2377 bfinfdpic_got_section (info), 2378 bfinfdpic_got_initial_offset (info) 2379 + entry->fd_entry) 2380 + bfinfdpic_got_section (info) 2381 ->output_section->vma 2382 + bfinfdpic_got_section (info) 2383 ->output_offset, 2384 R_BFIN_FUNCDESC_VALUE, idx, ad, entry); 2385 } 2386 2387 /* If we've omitted the dynamic relocation, just emit the fixed 2388 addresses of the symbol and of the local GOT base offset. */ 2389 if (bfd_link_pde (info) 2390 && sec 2391 && sec->output_section) 2392 { 2393 lowword = ad; 2394 highword = bfinfdpic_got_section (info)->output_section->vma 2395 + bfinfdpic_got_section (info)->output_offset 2396 + bfinfdpic_got_initial_offset (info); 2397 } 2398 else if (entry->lazyplt) 2399 { 2400 if (ad) 2401 return FALSE; 2402 2403 fd_lazy_rel_offset = ofst; 2404 2405 /* A function descriptor used for lazy or local resolving is 2406 initialized such that its high word contains the output 2407 section index in which the PLT entries are located, and 2408 the low word contains the address of the lazy PLT entry 2409 entry point, that must be within the memory region 2410 assigned to that section. */ 2411 lowword = entry->lzplt_entry + 4 2412 + bfinfdpic_plt_section (info)->output_offset 2413 + bfinfdpic_plt_section (info)->output_section->vma; 2414 highword = _bfinfdpic_osec_to_segment 2415 (output_bfd, bfinfdpic_plt_section (info)->output_section); 2416 } 2417 else 2418 { 2419 /* A function descriptor for a local function gets the index 2420 of the section. For a non-local function, it's 2421 disregarded. */ 2422 lowword = ad; 2423 if (sec == NULL 2424 || (entry->symndx == -1 && entry->d.h->dynindx != -1 2425 && entry->d.h->dynindx == idx)) 2426 highword = 0; 2427 else 2428 highword = _bfinfdpic_osec_to_segment 2429 (output_bfd, sec->output_section); 2430 } 2431 2432 bfd_put_32 (output_bfd, lowword, 2433 bfinfdpic_got_section (info)->contents 2434 + bfinfdpic_got_initial_offset (info) 2435 + entry->fd_entry); 2436 bfd_put_32 (output_bfd, highword, 2437 bfinfdpic_got_section (info)->contents 2438 + bfinfdpic_got_initial_offset (info) 2439 + entry->fd_entry + 4); 2440 } 2441 2442 /* Generate code for the PLT entry. */ 2443 if (entry->plt_entry != (bfd_vma) -1) 2444 { 2445 bfd_byte *plt_code = bfinfdpic_plt_section (info)->contents 2446 + entry->plt_entry; 2447 2448 BFD_ASSERT (entry->fd_entry); 2449 2450 /* Figure out what kind of PLT entry we need, depending on the 2451 location of the function descriptor within the GOT. */ 2452 if (entry->fd_entry >= -(1 << (18 - 1)) 2453 && entry->fd_entry + 4 < (1 << (18 - 1))) 2454 { 2455 /* P1 = [P3 + fd_entry]; P3 = [P3 + fd_entry + 4] */ 2456 bfd_put_32 (output_bfd, 2457 0xe519 | ((entry->fd_entry << 14) & 0xFFFF0000), 2458 plt_code); 2459 bfd_put_32 (output_bfd, 2460 0xe51b | (((entry->fd_entry + 4) << 14) & 0xFFFF0000), 2461 plt_code + 4); 2462 plt_code += 8; 2463 } 2464 else 2465 { 2466 /* P1.L = fd_entry; P1.H = fd_entry; 2467 P3 = P3 + P1; 2468 P1 = [P3]; 2469 P3 = [P3 + 4]; */ 2470 bfd_put_32 (output_bfd, 2471 0xe109 | (entry->fd_entry << 16), 2472 plt_code); 2473 bfd_put_32 (output_bfd, 2474 0xe149 | (entry->fd_entry & 0xFFFF0000), 2475 plt_code + 4); 2476 bfd_put_16 (output_bfd, 0x5ad9, plt_code + 8); 2477 bfd_put_16 (output_bfd, 0x9159, plt_code + 10); 2478 bfd_put_16 (output_bfd, 0xac5b, plt_code + 12); 2479 plt_code += 14; 2480 } 2481 /* JUMP (P1) */ 2482 bfd_put_16 (output_bfd, 0x0051, plt_code); 2483 } 2484 2485 /* Generate code for the lazy PLT entry. */ 2486 if (entry->lzplt_entry != (bfd_vma) -1) 2487 { 2488 bfd_byte *lzplt_code = bfinfdpic_plt_section (info)->contents 2489 + entry->lzplt_entry; 2490 bfd_vma resolverStub_addr; 2491 2492 bfd_put_32 (output_bfd, fd_lazy_rel_offset, lzplt_code); 2493 lzplt_code += 4; 2494 2495 resolverStub_addr = entry->lzplt_entry / BFINFDPIC_LZPLT_BLOCK_SIZE 2496 * BFINFDPIC_LZPLT_BLOCK_SIZE + BFINFDPIC_LZPLT_RESOLV_LOC; 2497 if (resolverStub_addr >= bfinfdpic_plt_initial_offset (info)) 2498 resolverStub_addr = bfinfdpic_plt_initial_offset (info) - LZPLT_NORMAL_SIZE - LZPLT_RESOLVER_EXTRA; 2499 2500 if (entry->lzplt_entry == resolverStub_addr) 2501 { 2502 /* This is a lazy PLT entry that includes a resolver call. 2503 P2 = [P3]; 2504 R3 = [P3 + 4]; 2505 JUMP (P2); */ 2506 bfd_put_32 (output_bfd, 2507 0xa05b915a, 2508 lzplt_code); 2509 bfd_put_16 (output_bfd, 0x0052, lzplt_code + 4); 2510 } 2511 else 2512 { 2513 /* JUMP.S resolverStub */ 2514 bfd_put_16 (output_bfd, 2515 0x2000 2516 | (((resolverStub_addr - entry->lzplt_entry) 2517 / 2) & (((bfd_vma)1 << 12) - 1)), 2518 lzplt_code); 2519 } 2520 } 2521 2522 return TRUE; 2523} 2524 2525/* Relocate an Blackfin ELF section. 2526 2527 The RELOCATE_SECTION function is called by the new ELF backend linker 2528 to handle the relocations for a section. 2529 2530 The relocs are always passed as Rela structures; if the section 2531 actually uses Rel structures, the r_addend field will always be 2532 zero. 2533 2534 This function is responsible for adjusting the section contents as 2535 necessary, and (if using Rela relocs and generating a relocatable 2536 output file) adjusting the reloc addend as necessary. 2537 2538 This function does not have to worry about setting the reloc 2539 address or the reloc symbol index. 2540 2541 LOCAL_SYMS is a pointer to the swapped in local symbols. 2542 2543 LOCAL_SECTIONS is an array giving the section in the input file 2544 corresponding to the st_shndx field of each local symbol. 2545 2546 The global hash table entry for the global symbols can be found 2547 via elf_sym_hashes (input_bfd). 2548 2549 When generating relocatable output, this function must handle 2550 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 2551 going to be the section symbol corresponding to the output 2552 section, which means that the addend must be adjusted 2553 accordingly. */ 2554 2555static bfd_boolean 2556bfinfdpic_relocate_section (bfd * output_bfd, 2557 struct bfd_link_info *info, 2558 bfd * input_bfd, 2559 asection * input_section, 2560 bfd_byte * contents, 2561 Elf_Internal_Rela * relocs, 2562 Elf_Internal_Sym * local_syms, 2563 asection ** local_sections) 2564{ 2565 Elf_Internal_Shdr *symtab_hdr; 2566 struct elf_link_hash_entry **sym_hashes; 2567 Elf_Internal_Rela *rel; 2568 Elf_Internal_Rela *relend; 2569 unsigned isec_segment, got_segment, plt_segment, 2570 check_segment[2]; 2571 int silence_segment_error = !bfd_link_pic (info); 2572 2573 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 2574 sym_hashes = elf_sym_hashes (input_bfd); 2575 relend = relocs + input_section->reloc_count; 2576 2577 isec_segment = _bfinfdpic_osec_to_segment (output_bfd, 2578 input_section->output_section); 2579 if (IS_FDPIC (output_bfd) && bfinfdpic_got_section (info)) 2580 got_segment = _bfinfdpic_osec_to_segment (output_bfd, 2581 bfinfdpic_got_section (info) 2582 ->output_section); 2583 else 2584 got_segment = -1; 2585 if (IS_FDPIC (output_bfd) && elf_hash_table (info)->dynamic_sections_created) 2586 plt_segment = _bfinfdpic_osec_to_segment (output_bfd, 2587 bfinfdpic_plt_section (info) 2588 ->output_section); 2589 else 2590 plt_segment = -1; 2591 2592 for (rel = relocs; rel < relend; rel ++) 2593 { 2594 reloc_howto_type *howto; 2595 unsigned long r_symndx; 2596 Elf_Internal_Sym *sym; 2597 asection *sec; 2598 struct elf_link_hash_entry *h; 2599 bfd_vma relocation; 2600 bfd_reloc_status_type r; 2601 const char * name = NULL; 2602 int r_type; 2603 asection *osec; 2604 struct bfinfdpic_relocs_info *picrel; 2605 bfd_vma orig_addend = rel->r_addend; 2606 2607 r_type = ELF32_R_TYPE (rel->r_info); 2608 2609 if (r_type == R_BFIN_GNU_VTINHERIT 2610 || r_type == R_BFIN_GNU_VTENTRY) 2611 continue; 2612 2613 r_symndx = ELF32_R_SYM (rel->r_info); 2614 howto = bfin_reloc_type_lookup (input_bfd, r_type); 2615 if (howto == NULL) 2616 { 2617 bfd_set_error (bfd_error_bad_value); 2618 return FALSE; 2619 } 2620 2621 h = NULL; 2622 sym = NULL; 2623 sec = NULL; 2624 2625 if (r_symndx < symtab_hdr->sh_info) 2626 { 2627 sym = local_syms + r_symndx; 2628 osec = sec = local_sections [r_symndx]; 2629 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2630 2631 name = bfd_elf_string_from_elf_section 2632 (input_bfd, symtab_hdr->sh_link, sym->st_name); 2633 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; 2634 } 2635 else 2636 { 2637 bfd_boolean warned, ignored; 2638 bfd_boolean unresolved_reloc; 2639 2640 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2641 r_symndx, symtab_hdr, sym_hashes, 2642 h, sec, relocation, 2643 unresolved_reloc, warned, ignored); 2644 osec = sec; 2645 } 2646 2647 if (sec != NULL && discarded_section (sec)) 2648 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 2649 rel, 1, relend, howto, 0, contents); 2650 2651 if (bfd_link_relocatable (info)) 2652 continue; 2653 2654 if (h != NULL 2655 && (h->root.type == bfd_link_hash_defined 2656 || h->root.type == bfd_link_hash_defweak) 2657 && !BFINFDPIC_SYM_LOCAL (info, h)) 2658 { 2659 osec = sec = NULL; 2660 relocation = 0; 2661 } 2662 2663 switch (r_type) 2664 { 2665 case R_BFIN_PCREL24: 2666 case R_BFIN_PCREL24_JUMP_L: 2667 case R_BFIN_BYTE4_DATA: 2668 if (! IS_FDPIC (output_bfd)) 2669 goto non_fdpic; 2670 /* Fall through. */ 2671 2672 case R_BFIN_GOT17M4: 2673 case R_BFIN_GOTHI: 2674 case R_BFIN_GOTLO: 2675 case R_BFIN_FUNCDESC_GOT17M4: 2676 case R_BFIN_FUNCDESC_GOTHI: 2677 case R_BFIN_FUNCDESC_GOTLO: 2678 case R_BFIN_GOTOFF17M4: 2679 case R_BFIN_GOTOFFHI: 2680 case R_BFIN_GOTOFFLO: 2681 case R_BFIN_FUNCDESC_GOTOFF17M4: 2682 case R_BFIN_FUNCDESC_GOTOFFHI: 2683 case R_BFIN_FUNCDESC_GOTOFFLO: 2684 case R_BFIN_FUNCDESC: 2685 case R_BFIN_FUNCDESC_VALUE: 2686 if (h != NULL) 2687 picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info 2688 (info), input_bfd, h, 2689 orig_addend, INSERT); 2690 else 2691 /* In order to find the entry we created before, we must 2692 use the original addend, not the one that may have been 2693 modified by _bfd_elf_rela_local_sym(). */ 2694 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info 2695 (info), input_bfd, r_symndx, 2696 orig_addend, INSERT); 2697 if (! picrel) 2698 return FALSE; 2699 2700 if (!_bfinfdpic_emit_got_relocs_plt_entries (picrel, output_bfd, info, 2701 osec, sym, 2702 rel->r_addend)) 2703 { 2704 _bfd_error_handler 2705 /* xgettext:c-format */ 2706 (_("%B: relocation at `%A+0x%x' references symbol `%s' with nonzero addend"), 2707 input_bfd, input_section, rel->r_offset, name); 2708 return FALSE; 2709 2710 } 2711 2712 break; 2713 2714 default: 2715 non_fdpic: 2716 picrel = NULL; 2717 if (h && ! BFINFDPIC_SYM_LOCAL (info, h) 2718 && _bfd_elf_section_offset (output_bfd, info, input_section, 2719 rel->r_offset) != (bfd_vma) -1) 2720 { 2721 info->callbacks->warning 2722 (info, _("relocation references symbol not defined in the module"), 2723 name, input_bfd, input_section, rel->r_offset); 2724 return FALSE; 2725 } 2726 break; 2727 } 2728 2729 switch (r_type) 2730 { 2731 case R_BFIN_PCREL24: 2732 case R_BFIN_PCREL24_JUMP_L: 2733 check_segment[0] = isec_segment; 2734 if (! IS_FDPIC (output_bfd)) 2735 check_segment[1] = isec_segment; 2736 else if (picrel->plt) 2737 { 2738 relocation = bfinfdpic_plt_section (info)->output_section->vma 2739 + bfinfdpic_plt_section (info)->output_offset 2740 + picrel->plt_entry; 2741 check_segment[1] = plt_segment; 2742 } 2743 /* We don't want to warn on calls to undefined weak symbols, 2744 as calls to them must be protected by non-NULL tests 2745 anyway, and unprotected calls would invoke undefined 2746 behavior. */ 2747 else if (picrel->symndx == -1 2748 && picrel->d.h->root.type == bfd_link_hash_undefweak) 2749 check_segment[1] = check_segment[0]; 2750 else 2751 check_segment[1] = sec 2752 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section) 2753 : (unsigned)-1; 2754 break; 2755 2756 case R_BFIN_GOT17M4: 2757 case R_BFIN_GOTHI: 2758 case R_BFIN_GOTLO: 2759 relocation = picrel->got_entry; 2760 check_segment[0] = check_segment[1] = got_segment; 2761 break; 2762 2763 case R_BFIN_FUNCDESC_GOT17M4: 2764 case R_BFIN_FUNCDESC_GOTHI: 2765 case R_BFIN_FUNCDESC_GOTLO: 2766 relocation = picrel->fdgot_entry; 2767 check_segment[0] = check_segment[1] = got_segment; 2768 break; 2769 2770 case R_BFIN_GOTOFFHI: 2771 case R_BFIN_GOTOFF17M4: 2772 case R_BFIN_GOTOFFLO: 2773 relocation -= bfinfdpic_got_section (info)->output_section->vma 2774 + bfinfdpic_got_section (info)->output_offset 2775 + bfinfdpic_got_initial_offset (info); 2776 check_segment[0] = got_segment; 2777 check_segment[1] = sec 2778 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section) 2779 : (unsigned)-1; 2780 break; 2781 2782 case R_BFIN_FUNCDESC_GOTOFF17M4: 2783 case R_BFIN_FUNCDESC_GOTOFFHI: 2784 case R_BFIN_FUNCDESC_GOTOFFLO: 2785 relocation = picrel->fd_entry; 2786 check_segment[0] = check_segment[1] = got_segment; 2787 break; 2788 2789 case R_BFIN_FUNCDESC: 2790 { 2791 int dynindx; 2792 bfd_vma addend = rel->r_addend; 2793 2794 if (! (h && h->root.type == bfd_link_hash_undefweak 2795 && BFINFDPIC_SYM_LOCAL (info, h))) 2796 { 2797 /* If the symbol is dynamic and there may be dynamic 2798 symbol resolution because we are or are linked with a 2799 shared library, emit a FUNCDESC relocation such that 2800 the dynamic linker will allocate the function 2801 descriptor. If the symbol needs a non-local function 2802 descriptor but binds locally (e.g., its visibility is 2803 protected, emit a dynamic relocation decayed to 2804 section+offset. */ 2805 if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h) 2806 && BFINFDPIC_SYM_LOCAL (info, h) 2807 && !bfd_link_pde (info)) 2808 { 2809 dynindx = elf_section_data (h->root.u.def.section 2810 ->output_section)->dynindx; 2811 addend += h->root.u.def.section->output_offset 2812 + h->root.u.def.value; 2813 } 2814 else if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h)) 2815 { 2816 if (addend) 2817 { 2818 info->callbacks->warning 2819 (info, _("R_BFIN_FUNCDESC references dynamic symbol with nonzero addend"), 2820 name, input_bfd, input_section, rel->r_offset); 2821 return FALSE; 2822 } 2823 dynindx = h->dynindx; 2824 } 2825 else 2826 { 2827 /* Otherwise, we know we have a private function 2828 descriptor, so reference it directly. */ 2829 BFD_ASSERT (picrel->privfd); 2830 r_type = R_BFIN_BYTE4_DATA; 2831 dynindx = elf_section_data (bfinfdpic_got_section (info) 2832 ->output_section)->dynindx; 2833 addend = bfinfdpic_got_section (info)->output_offset 2834 + bfinfdpic_got_initial_offset (info) 2835 + picrel->fd_entry; 2836 } 2837 2838 /* If there is room for dynamic symbol resolution, emit 2839 the dynamic relocation. However, if we're linking an 2840 executable at a fixed location, we won't have emitted a 2841 dynamic symbol entry for the got section, so idx will 2842 be zero, which means we can and should compute the 2843 address of the private descriptor ourselves. */ 2844 if (bfd_link_pde (info) 2845 && (!h || BFINFDPIC_FUNCDESC_LOCAL (info, h))) 2846 { 2847 bfd_vma offset; 2848 2849 addend += bfinfdpic_got_section (info)->output_section->vma; 2850 if ((bfd_get_section_flags (output_bfd, 2851 input_section->output_section) 2852 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) 2853 { 2854 if (_bfinfdpic_osec_readonly_p (output_bfd, 2855 input_section 2856 ->output_section)) 2857 { 2858 info->callbacks->warning 2859 (info, 2860 _("cannot emit fixups in read-only section"), 2861 name, input_bfd, input_section, rel->r_offset); 2862 return FALSE; 2863 } 2864 2865 offset = _bfd_elf_section_offset 2866 (output_bfd, info, 2867 input_section, rel->r_offset); 2868 2869 if (offset != (bfd_vma)-1) 2870 _bfinfdpic_add_rofixup (output_bfd, 2871 bfinfdpic_gotfixup_section 2872 (info), 2873 offset + input_section 2874 ->output_section->vma 2875 + input_section->output_offset, 2876 picrel); 2877 } 2878 } 2879 else if ((bfd_get_section_flags (output_bfd, 2880 input_section->output_section) 2881 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) 2882 { 2883 bfd_vma offset; 2884 2885 if (_bfinfdpic_osec_readonly_p (output_bfd, 2886 input_section 2887 ->output_section)) 2888 { 2889 info->callbacks->warning 2890 (info, 2891 _("cannot emit dynamic relocations in read-only section"), 2892 name, input_bfd, input_section, rel->r_offset); 2893 return FALSE; 2894 } 2895 offset = _bfd_elf_section_offset (output_bfd, info, 2896 input_section, rel->r_offset); 2897 2898 if (offset != (bfd_vma)-1) 2899 _bfinfdpic_add_dyn_reloc (output_bfd, 2900 bfinfdpic_gotrel_section (info), 2901 offset + input_section 2902 ->output_section->vma 2903 + input_section->output_offset, 2904 r_type, 2905 dynindx, addend, picrel); 2906 } 2907 else 2908 addend += bfinfdpic_got_section (info)->output_section->vma; 2909 } 2910 2911 /* We want the addend in-place because dynamic 2912 relocations are REL. Setting relocation to it should 2913 arrange for it to be installed. */ 2914 relocation = addend - rel->r_addend; 2915 } 2916 check_segment[0] = check_segment[1] = got_segment; 2917 break; 2918 2919 case R_BFIN_BYTE4_DATA: 2920 if (! IS_FDPIC (output_bfd)) 2921 { 2922 check_segment[0] = check_segment[1] = -1; 2923 break; 2924 } 2925 /* Fall through. */ 2926 case R_BFIN_FUNCDESC_VALUE: 2927 { 2928 int dynindx; 2929 bfd_vma addend = rel->r_addend; 2930 bfd_vma offset; 2931 offset = _bfd_elf_section_offset (output_bfd, info, 2932 input_section, rel->r_offset); 2933 2934 /* If the symbol is dynamic but binds locally, use 2935 section+offset. */ 2936 if (h && ! BFINFDPIC_SYM_LOCAL (info, h)) 2937 { 2938 if (addend && r_type == R_BFIN_FUNCDESC_VALUE) 2939 { 2940 info->callbacks->warning 2941 (info, _("R_BFIN_FUNCDESC_VALUE references dynamic symbol with nonzero addend"), 2942 name, input_bfd, input_section, rel->r_offset); 2943 return FALSE; 2944 } 2945 dynindx = h->dynindx; 2946 } 2947 else 2948 { 2949 if (h) 2950 addend += h->root.u.def.value; 2951 else 2952 addend += sym->st_value; 2953 if (osec) 2954 addend += osec->output_offset; 2955 if (osec && osec->output_section 2956 && ! bfd_is_abs_section (osec->output_section) 2957 && ! bfd_is_und_section (osec->output_section)) 2958 dynindx = elf_section_data (osec->output_section)->dynindx; 2959 else 2960 dynindx = 0; 2961 } 2962 2963 /* If we're linking an executable at a fixed address, we 2964 can omit the dynamic relocation as long as the symbol 2965 is defined in the current link unit (which is implied 2966 by its output section not being NULL). */ 2967 if (bfd_link_pde (info) 2968 && (!h || BFINFDPIC_SYM_LOCAL (info, h))) 2969 { 2970 if (osec) 2971 addend += osec->output_section->vma; 2972 if (IS_FDPIC (input_bfd) 2973 && (bfd_get_section_flags (output_bfd, 2974 input_section->output_section) 2975 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) 2976 { 2977 if (_bfinfdpic_osec_readonly_p (output_bfd, 2978 input_section 2979 ->output_section)) 2980 { 2981 info->callbacks->warning 2982 (info, 2983 _("cannot emit fixups in read-only section"), 2984 name, input_bfd, input_section, rel->r_offset); 2985 return FALSE; 2986 } 2987 if (!h || h->root.type != bfd_link_hash_undefweak) 2988 { 2989 if (offset != (bfd_vma)-1) 2990 { 2991 _bfinfdpic_add_rofixup (output_bfd, 2992 bfinfdpic_gotfixup_section 2993 (info), 2994 offset + input_section 2995 ->output_section->vma 2996 + input_section->output_offset, 2997 picrel); 2998 2999 if (r_type == R_BFIN_FUNCDESC_VALUE) 3000 _bfinfdpic_add_rofixup 3001 (output_bfd, 3002 bfinfdpic_gotfixup_section (info), 3003 offset + input_section->output_section->vma 3004 + input_section->output_offset + 4, picrel); 3005 } 3006 } 3007 } 3008 } 3009 else 3010 { 3011 if ((bfd_get_section_flags (output_bfd, 3012 input_section->output_section) 3013 & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) 3014 { 3015 if (_bfinfdpic_osec_readonly_p (output_bfd, 3016 input_section 3017 ->output_section)) 3018 { 3019 info->callbacks->warning 3020 (info, 3021 _("cannot emit dynamic relocations in read-only section"), 3022 name, input_bfd, input_section, rel->r_offset); 3023 return FALSE; 3024 } 3025 3026 if (offset != (bfd_vma)-1) 3027 _bfinfdpic_add_dyn_reloc (output_bfd, 3028 bfinfdpic_gotrel_section (info), 3029 offset 3030 + input_section->output_section->vma 3031 + input_section->output_offset, 3032 r_type, dynindx, addend, picrel); 3033 } 3034 else if (osec) 3035 addend += osec->output_section->vma; 3036 /* We want the addend in-place because dynamic 3037 relocations are REL. Setting relocation to it 3038 should arrange for it to be installed. */ 3039 relocation = addend - rel->r_addend; 3040 } 3041 3042 if (r_type == R_BFIN_FUNCDESC_VALUE) 3043 { 3044 /* If we've omitted the dynamic relocation, just emit 3045 the fixed addresses of the symbol and of the local 3046 GOT base offset. */ 3047 if (bfd_link_pde (info) 3048 && (!h || BFINFDPIC_SYM_LOCAL (info, h))) 3049 bfd_put_32 (output_bfd, 3050 bfinfdpic_got_section (info)->output_section->vma 3051 + bfinfdpic_got_section (info)->output_offset 3052 + bfinfdpic_got_initial_offset (info), 3053 contents + rel->r_offset + 4); 3054 else 3055 /* A function descriptor used for lazy or local 3056 resolving is initialized such that its high word 3057 contains the output section index in which the 3058 PLT entries are located, and the low word 3059 contains the offset of the lazy PLT entry entry 3060 point into that section. */ 3061 bfd_put_32 (output_bfd, 3062 h && ! BFINFDPIC_SYM_LOCAL (info, h) 3063 ? 0 3064 : _bfinfdpic_osec_to_segment (output_bfd, 3065 sec 3066 ->output_section), 3067 contents + rel->r_offset + 4); 3068 } 3069 } 3070 check_segment[0] = check_segment[1] = got_segment; 3071 break; 3072 3073 default: 3074 check_segment[0] = isec_segment; 3075 check_segment[1] = sec 3076 ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section) 3077 : (unsigned)-1; 3078 break; 3079 } 3080 3081 if (check_segment[0] != check_segment[1] && IS_FDPIC (output_bfd)) 3082 { 3083#if 1 /* If you take this out, remove the #error from fdpic-static-6.d 3084 in the ld testsuite. */ 3085 /* This helps catch problems in GCC while we can't do more 3086 than static linking. The idea is to test whether the 3087 input file basename is crt0.o only once. */ 3088 if (silence_segment_error == 1) 3089 silence_segment_error = 3090 (strlen (input_bfd->filename) == 6 3091 && filename_cmp (input_bfd->filename, "crt0.o") == 0) 3092 || (strlen (input_bfd->filename) > 6 3093 && filename_cmp (input_bfd->filename 3094 + strlen (input_bfd->filename) - 7, 3095 "/crt0.o") == 0) 3096 ? -1 : 0; 3097#endif 3098 if (!silence_segment_error 3099 /* We don't want duplicate errors for undefined 3100 symbols. */ 3101 && !(picrel && picrel->symndx == -1 3102 && picrel->d.h->root.type == bfd_link_hash_undefined)) 3103 info->callbacks->warning 3104 (info, 3105 bfd_link_pic (info) 3106 ? _("relocations between different segments are not supported") 3107 : _("warning: relocation references a different segment"), 3108 name, input_bfd, input_section, rel->r_offset); 3109 if (!silence_segment_error && bfd_link_pic (info)) 3110 return FALSE; 3111 elf_elfheader (output_bfd)->e_flags |= EF_BFIN_PIC; 3112 } 3113 3114 switch (r_type) 3115 { 3116 case R_BFIN_GOTOFFHI: 3117 /* We need the addend to be applied before we shift the 3118 value right. */ 3119 relocation += rel->r_addend; 3120 /* Fall through. */ 3121 case R_BFIN_GOTHI: 3122 case R_BFIN_FUNCDESC_GOTHI: 3123 case R_BFIN_FUNCDESC_GOTOFFHI: 3124 relocation >>= 16; 3125 /* Fall through. */ 3126 3127 case R_BFIN_GOTLO: 3128 case R_BFIN_FUNCDESC_GOTLO: 3129 case R_BFIN_GOTOFFLO: 3130 case R_BFIN_FUNCDESC_GOTOFFLO: 3131 relocation &= 0xffff; 3132 break; 3133 3134 default: 3135 break; 3136 } 3137 3138 switch (r_type) 3139 { 3140 case R_BFIN_PCREL24: 3141 case R_BFIN_PCREL24_JUMP_L: 3142 if (! IS_FDPIC (output_bfd) || ! picrel->plt) 3143 break; 3144 /* Fall through. */ 3145 3146 /* When referencing a GOT entry, a function descriptor or a 3147 PLT, we don't want the addend to apply to the reference, 3148 but rather to the referenced symbol. The actual entry 3149 will have already been created taking the addend into 3150 account, so cancel it out here. */ 3151 case R_BFIN_GOT17M4: 3152 case R_BFIN_GOTHI: 3153 case R_BFIN_GOTLO: 3154 case R_BFIN_FUNCDESC_GOT17M4: 3155 case R_BFIN_FUNCDESC_GOTHI: 3156 case R_BFIN_FUNCDESC_GOTLO: 3157 case R_BFIN_FUNCDESC_GOTOFF17M4: 3158 case R_BFIN_FUNCDESC_GOTOFFHI: 3159 case R_BFIN_FUNCDESC_GOTOFFLO: 3160 /* Note that we only want GOTOFFHI, not GOTOFFLO or GOTOFF17M4 3161 here, since we do want to apply the addend to the others. 3162 Note that we've applied the addend to GOTOFFHI before we 3163 shifted it right. */ 3164 case R_BFIN_GOTOFFHI: 3165 relocation -= rel->r_addend; 3166 break; 3167 3168 default: 3169 break; 3170 } 3171 3172 r = bfin_final_link_relocate (rel, howto, input_bfd, input_section, 3173 contents, rel->r_offset, 3174 relocation, rel->r_addend); 3175 3176 if (r != bfd_reloc_ok) 3177 { 3178 const char * msg = (const char *) NULL; 3179 3180 switch (r) 3181 { 3182 case bfd_reloc_overflow: 3183 (*info->callbacks->reloc_overflow) 3184 (info, (h ? &h->root : NULL), name, howto->name, 3185 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 3186 break; 3187 3188 case bfd_reloc_undefined: 3189 (*info->callbacks->undefined_symbol) 3190 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 3191 break; 3192 3193 case bfd_reloc_outofrange: 3194 msg = _("internal error: out of range error"); 3195 break; 3196 3197 case bfd_reloc_notsupported: 3198 msg = _("internal error: unsupported relocation error"); 3199 break; 3200 3201 case bfd_reloc_dangerous: 3202 msg = _("internal error: dangerous relocation"); 3203 break; 3204 3205 default: 3206 msg = _("internal error: unknown error"); 3207 break; 3208 } 3209 3210 if (msg) 3211 (*info->callbacks->warning) (info, msg, name, input_bfd, 3212 input_section, rel->r_offset); 3213 } 3214 } 3215 3216 return TRUE; 3217} 3218 3219/* Update the relocation information for the relocations of the section 3220 being removed. */ 3221 3222static bfd_boolean 3223bfinfdpic_gc_sweep_hook (bfd *abfd, 3224 struct bfd_link_info *info, 3225 asection *sec, 3226 const Elf_Internal_Rela *relocs) 3227{ 3228 Elf_Internal_Shdr *symtab_hdr; 3229 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 3230 const Elf_Internal_Rela *rel; 3231 const Elf_Internal_Rela *rel_end; 3232 struct bfinfdpic_relocs_info *picrel; 3233 3234 BFD_ASSERT (IS_FDPIC (abfd)); 3235 3236 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 3237 sym_hashes = elf_sym_hashes (abfd); 3238 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym); 3239 if (!elf_bad_symtab (abfd)) 3240 sym_hashes_end -= symtab_hdr->sh_info; 3241 3242 rel_end = relocs + sec->reloc_count; 3243 for (rel = relocs; rel < rel_end; rel++) 3244 { 3245 struct elf_link_hash_entry *h; 3246 unsigned long r_symndx; 3247 3248 r_symndx = ELF32_R_SYM (rel->r_info); 3249 if (r_symndx < symtab_hdr->sh_info) 3250 h = NULL; 3251 else 3252 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 3253 3254 if (h != NULL) 3255 picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info), 3256 abfd, h, 3257 rel->r_addend, NO_INSERT); 3258 else 3259 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info 3260 (info), abfd, r_symndx, 3261 rel->r_addend, NO_INSERT); 3262 3263 if (!picrel) 3264 return TRUE; 3265 3266 switch (ELF32_R_TYPE (rel->r_info)) 3267 { 3268 case R_BFIN_PCREL24: 3269 case R_BFIN_PCREL24_JUMP_L: 3270 picrel->call--; 3271 break; 3272 3273 case R_BFIN_FUNCDESC_VALUE: 3274 picrel->relocsfdv--; 3275 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) 3276 picrel->relocs32++; 3277 /* Fall through. */ 3278 3279 case R_BFIN_BYTE4_DATA: 3280 picrel->sym--; 3281 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) 3282 picrel->relocs32--; 3283 break; 3284 3285 case R_BFIN_GOT17M4: 3286 picrel->got17m4--; 3287 break; 3288 3289 case R_BFIN_GOTHI: 3290 case R_BFIN_GOTLO: 3291 picrel->gothilo--; 3292 break; 3293 3294 case R_BFIN_FUNCDESC_GOT17M4: 3295 picrel->fdgot17m4--; 3296 break; 3297 3298 case R_BFIN_FUNCDESC_GOTHI: 3299 case R_BFIN_FUNCDESC_GOTLO: 3300 picrel->fdgothilo--; 3301 break; 3302 3303 case R_BFIN_GOTOFF17M4: 3304 case R_BFIN_GOTOFFHI: 3305 case R_BFIN_GOTOFFLO: 3306 picrel->gotoff--; 3307 break; 3308 3309 case R_BFIN_FUNCDESC_GOTOFF17M4: 3310 picrel->fdgoff17m4--; 3311 break; 3312 3313 case R_BFIN_FUNCDESC_GOTOFFHI: 3314 case R_BFIN_FUNCDESC_GOTOFFLO: 3315 picrel->fdgoffhilo--; 3316 break; 3317 3318 case R_BFIN_FUNCDESC: 3319 picrel->fd--; 3320 picrel->relocsfd--; 3321 break; 3322 3323 default: 3324 break; 3325 } 3326 } 3327 3328 return TRUE; 3329} 3330 3331/* We need dynamic symbols for every section, since segments can 3332 relocate independently. */ 3333static bfd_boolean 3334_bfinfdpic_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED, 3335 struct bfd_link_info *info ATTRIBUTE_UNUSED, 3336 asection *p) 3337{ 3338 switch (elf_section_data (p)->this_hdr.sh_type) 3339 { 3340 case SHT_PROGBITS: 3341 case SHT_NOBITS: 3342 /* If sh_type is yet undecided, assume it could be 3343 SHT_PROGBITS/SHT_NOBITS. */ 3344 case SHT_NULL: 3345 return FALSE; 3346 3347 /* There shouldn't be section relative relocations 3348 against any other section. */ 3349 default: 3350 return TRUE; 3351 } 3352} 3353 3354/* Create a .got section, as well as its additional info field. This 3355 is almost entirely copied from 3356 elflink.c:_bfd_elf_create_got_section(). */ 3357 3358static bfd_boolean 3359_bfin_create_got_section (bfd *abfd, struct bfd_link_info *info) 3360{ 3361 flagword flags, pltflags; 3362 asection *s; 3363 struct elf_link_hash_entry *h; 3364 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 3365 int ptralign; 3366 3367 /* This function may be called more than once. */ 3368 s = elf_hash_table (info)->sgot; 3369 if (s != NULL) 3370 return TRUE; 3371 3372 /* Machine specific: although pointers are 32-bits wide, we want the 3373 GOT to be aligned to a 64-bit boundary, such that function 3374 descriptors in it can be accessed with 64-bit loads and 3375 stores. */ 3376 ptralign = 3; 3377 3378 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 3379 | SEC_LINKER_CREATED); 3380 pltflags = flags; 3381 3382 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags); 3383 elf_hash_table (info)->sgot = s; 3384 if (s == NULL 3385 || !bfd_set_section_alignment (abfd, s, ptralign)) 3386 return FALSE; 3387 3388 if (bed->want_got_sym) 3389 { 3390 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got 3391 (or .got.plt) section. We don't do this in the linker script 3392 because we don't want to define the symbol if we are not creating 3393 a global offset table. */ 3394 h = _bfd_elf_define_linkage_sym (abfd, info, s, "__GLOBAL_OFFSET_TABLE_"); 3395 elf_hash_table (info)->hgot = h; 3396 if (h == NULL) 3397 return FALSE; 3398 3399 /* Machine-specific: we want the symbol for executables as 3400 well. */ 3401 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 3402 return FALSE; 3403 } 3404 3405 /* The first bit of the global offset table is the header. */ 3406 s->size += bed->got_header_size; 3407 3408 /* This is the machine-specific part. Create and initialize section 3409 data for the got. */ 3410 if (IS_FDPIC (abfd)) 3411 { 3412 bfinfdpic_relocs_info (info) = htab_try_create (1, 3413 bfinfdpic_relocs_info_hash, 3414 bfinfdpic_relocs_info_eq, 3415 (htab_del) NULL); 3416 if (! bfinfdpic_relocs_info (info)) 3417 return FALSE; 3418 3419 s = bfd_make_section_anyway_with_flags (abfd, ".rel.got", 3420 (flags | SEC_READONLY)); 3421 if (s == NULL 3422 || ! bfd_set_section_alignment (abfd, s, 2)) 3423 return FALSE; 3424 3425 bfinfdpic_gotrel_section (info) = s; 3426 3427 /* Machine-specific. */ 3428 s = bfd_make_section_anyway_with_flags (abfd, ".rofixup", 3429 (flags | SEC_READONLY)); 3430 if (s == NULL 3431 || ! bfd_set_section_alignment (abfd, s, 2)) 3432 return FALSE; 3433 3434 bfinfdpic_gotfixup_section (info) = s; 3435 } 3436 3437 pltflags |= SEC_CODE; 3438 if (bed->plt_not_loaded) 3439 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS); 3440 if (bed->plt_readonly) 3441 pltflags |= SEC_READONLY; 3442 3443 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags); 3444 if (s == NULL 3445 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) 3446 return FALSE; 3447 /* Blackfin-specific: remember it. */ 3448 bfinfdpic_plt_section (info) = s; 3449 3450 if (bed->want_plt_sym) 3451 { 3452 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the 3453 .plt section. */ 3454 struct bfd_link_hash_entry *bh = NULL; 3455 3456 if (! (_bfd_generic_link_add_one_symbol 3457 (info, abfd, "__PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, 0, NULL, 3458 FALSE, get_elf_backend_data (abfd)->collect, &bh))) 3459 return FALSE; 3460 h = (struct elf_link_hash_entry *) bh; 3461 h->def_regular = 1; 3462 h->type = STT_OBJECT; 3463 3464 if (! bfd_link_executable (info) 3465 && ! bfd_elf_link_record_dynamic_symbol (info, h)) 3466 return FALSE; 3467 } 3468 3469 /* Blackfin-specific: we want rel relocations for the plt. */ 3470 s = bfd_make_section_anyway_with_flags (abfd, ".rel.plt", 3471 flags | SEC_READONLY); 3472 if (s == NULL 3473 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) 3474 return FALSE; 3475 /* Blackfin-specific: remember it. */ 3476 bfinfdpic_pltrel_section (info) = s; 3477 3478 return TRUE; 3479} 3480 3481/* Make sure the got and plt sections exist, and that our pointers in 3482 the link hash table point to them. */ 3483 3484static bfd_boolean 3485elf32_bfinfdpic_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 3486{ 3487 /* This is mostly copied from 3488 elflink.c:_bfd_elf_create_dynamic_sections(). */ 3489 flagword flags; 3490 asection *s; 3491 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 3492 3493 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 3494 | SEC_LINKER_CREATED); 3495 3496 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and 3497 .rel[a].bss sections. */ 3498 3499 /* Blackfin-specific: we want to create the GOT in the Blackfin way. */ 3500 if (! _bfin_create_got_section (abfd, info)) 3501 return FALSE; 3502 3503 /* Blackfin-specific: make sure we created everything we wanted. */ 3504 BFD_ASSERT (bfinfdpic_got_section (info) && bfinfdpic_gotrel_section (info) 3505 /* && bfinfdpic_gotfixup_section (info) */ 3506 && bfinfdpic_plt_section (info) 3507 && bfinfdpic_pltrel_section (info)); 3508 3509 if (bed->want_dynbss) 3510 { 3511 /* The .dynbss section is a place to put symbols which are defined 3512 by dynamic objects, are referenced by regular objects, and are 3513 not functions. We must allocate space for them in the process 3514 image and use a R_*_COPY reloc to tell the dynamic linker to 3515 initialize them at run time. The linker script puts the .dynbss 3516 section into the .bss section of the final image. */ 3517 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss", 3518 SEC_ALLOC | SEC_LINKER_CREATED); 3519 if (s == NULL) 3520 return FALSE; 3521 3522 /* The .rel[a].bss section holds copy relocs. This section is not 3523 normally needed. We need to create it here, though, so that the 3524 linker will map it to an output section. We can't just create it 3525 only if we need it, because we will not know whether we need it 3526 until we have seen all the input files, and the first time the 3527 main linker code calls BFD after examining all the input files 3528 (size_dynamic_sections) the input sections have already been 3529 mapped to the output sections. If the section turns out not to 3530 be needed, we can discard it later. We will never need this 3531 section when generating a shared object, since they do not use 3532 copy relocs. */ 3533 if (! bfd_link_pic (info)) 3534 { 3535 s = bfd_make_section_anyway_with_flags (abfd, 3536 ".rela.bss", 3537 flags | SEC_READONLY); 3538 if (s == NULL 3539 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) 3540 return FALSE; 3541 } 3542 } 3543 3544 return TRUE; 3545} 3546 3547/* Compute the total GOT size required by each symbol in each range. 3548 Symbols may require up to 4 words in the GOT: an entry pointing to 3549 the symbol, an entry pointing to its function descriptor, and a 3550 private function descriptors taking two words. */ 3551 3552static void 3553_bfinfdpic_count_nontls_entries (struct bfinfdpic_relocs_info *entry, 3554 struct _bfinfdpic_dynamic_got_info *dinfo) 3555{ 3556 /* Allocate space for a GOT entry pointing to the symbol. */ 3557 if (entry->got17m4) 3558 dinfo->got17m4 += 4; 3559 else if (entry->gothilo) 3560 dinfo->gothilo += 4; 3561 else 3562 entry->relocs32--; 3563 entry->relocs32++; 3564 3565 /* Allocate space for a GOT entry pointing to the function 3566 descriptor. */ 3567 if (entry->fdgot17m4) 3568 dinfo->got17m4 += 4; 3569 else if (entry->fdgothilo) 3570 dinfo->gothilo += 4; 3571 else 3572 entry->relocsfd--; 3573 entry->relocsfd++; 3574 3575 /* Decide whether we need a PLT entry, a function descriptor in the 3576 GOT, and a lazy PLT entry for this symbol. */ 3577 entry->plt = entry->call 3578 && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h) 3579 && elf_hash_table (dinfo->info)->dynamic_sections_created; 3580 entry->privfd = entry->plt 3581 || entry->fdgoff17m4 || entry->fdgoffhilo 3582 || ((entry->fd || entry->fdgot17m4 || entry->fdgothilo) 3583 && (entry->symndx != -1 3584 || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h))); 3585 entry->lazyplt = entry->privfd 3586 && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h) 3587 && ! (dinfo->info->flags & DF_BIND_NOW) 3588 && elf_hash_table (dinfo->info)->dynamic_sections_created; 3589 3590 /* Allocate space for a function descriptor. */ 3591 if (entry->fdgoff17m4) 3592 dinfo->fd17m4 += 8; 3593 else if (entry->privfd && entry->plt) 3594 dinfo->fdplt += 8; 3595 else if (entry->privfd) 3596 dinfo->fdhilo += 8; 3597 else 3598 entry->relocsfdv--; 3599 entry->relocsfdv++; 3600 3601 if (entry->lazyplt) 3602 dinfo->lzplt += LZPLT_NORMAL_SIZE; 3603} 3604 3605/* Compute the number of dynamic relocations and fixups that a symbol 3606 requires, and add (or subtract) from the grand and per-symbol 3607 totals. */ 3608 3609static void 3610_bfinfdpic_count_relocs_fixups (struct bfinfdpic_relocs_info *entry, 3611 struct _bfinfdpic_dynamic_got_info *dinfo, 3612 bfd_boolean subtract) 3613{ 3614 bfd_vma relocs = 0, fixups = 0; 3615 3616 if (!bfd_link_pde (dinfo->info)) 3617 relocs = entry->relocs32 + entry->relocsfd + entry->relocsfdv; 3618 else 3619 { 3620 if (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h)) 3621 { 3622 if (entry->symndx != -1 3623 || entry->d.h->root.type != bfd_link_hash_undefweak) 3624 fixups += entry->relocs32 + 2 * entry->relocsfdv; 3625 } 3626 else 3627 relocs += entry->relocs32 + entry->relocsfdv; 3628 3629 if (entry->symndx != -1 3630 || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h)) 3631 { 3632 if (entry->symndx != -1 3633 || entry->d.h->root.type != bfd_link_hash_undefweak) 3634 fixups += entry->relocsfd; 3635 } 3636 else 3637 relocs += entry->relocsfd; 3638 } 3639 3640 if (subtract) 3641 { 3642 relocs = - relocs; 3643 fixups = - fixups; 3644 } 3645 3646 entry->dynrelocs += relocs; 3647 entry->fixups += fixups; 3648 dinfo->relocs += relocs; 3649 dinfo->fixups += fixups; 3650} 3651 3652/* Compute the total GOT and PLT size required by each symbol in each range. * 3653 Symbols may require up to 4 words in the GOT: an entry pointing to 3654 the symbol, an entry pointing to its function descriptor, and a 3655 private function descriptors taking two words. */ 3656 3657static int 3658_bfinfdpic_count_got_plt_entries (void **entryp, void *dinfo_) 3659{ 3660 struct bfinfdpic_relocs_info *entry = *entryp; 3661 struct _bfinfdpic_dynamic_got_info *dinfo = dinfo_; 3662 3663 _bfinfdpic_count_nontls_entries (entry, dinfo); 3664 3665 _bfinfdpic_count_relocs_fixups (entry, dinfo, FALSE); 3666 3667 return 1; 3668} 3669 3670/* This structure is used to assign offsets to got entries, function 3671 descriptors, plt entries and lazy plt entries. */ 3672 3673struct _bfinfdpic_dynamic_got_plt_info 3674{ 3675 /* Summary information collected with _bfinfdpic_count_got_plt_entries. */ 3676 struct _bfinfdpic_dynamic_got_info g; 3677 3678 /* For each addressable range, we record a MAX (positive) and MIN 3679 (negative) value. CUR is used to assign got entries, and it's 3680 incremented from an initial positive value to MAX, then from MIN 3681 to FDCUR (unless FDCUR wraps around first). FDCUR is used to 3682 assign function descriptors, and it's decreased from an initial 3683 non-positive value to MIN, then from MAX down to CUR (unless CUR 3684 wraps around first). All of MIN, MAX, CUR and FDCUR always point 3685 to even words. ODD, if non-zero, indicates an odd word to be 3686 used for the next got entry, otherwise CUR is used and 3687 incremented by a pair of words, wrapping around when it reaches 3688 MAX. FDCUR is decremented (and wrapped) before the next function 3689 descriptor is chosen. FDPLT indicates the number of remaining 3690 slots that can be used for function descriptors used only by PLT 3691 entries. */ 3692 struct _bfinfdpic_dynamic_got_alloc_data 3693 { 3694 bfd_signed_vma max, cur, odd, fdcur, min; 3695 bfd_vma fdplt; 3696 } got17m4, gothilo; 3697}; 3698 3699/* Determine the positive and negative ranges to be used by each 3700 offset range in the GOT. FDCUR and CUR, that must be aligned to a 3701 double-word boundary, are the minimum (negative) and maximum 3702 (positive) GOT offsets already used by previous ranges, except for 3703 an ODD entry that may have been left behind. GOT and FD indicate 3704 the size of GOT entries and function descriptors that must be 3705 placed within the range from -WRAP to WRAP. If there's room left, 3706 up to FDPLT bytes should be reserved for additional function 3707 descriptors. */ 3708 3709inline static bfd_signed_vma 3710_bfinfdpic_compute_got_alloc_data (struct _bfinfdpic_dynamic_got_alloc_data *gad, 3711 bfd_signed_vma fdcur, 3712 bfd_signed_vma odd, 3713 bfd_signed_vma cur, 3714 bfd_vma got, 3715 bfd_vma fd, 3716 bfd_vma fdplt, 3717 bfd_vma wrap) 3718{ 3719 bfd_signed_vma wrapmin = -wrap; 3720 3721 /* Start at the given initial points. */ 3722 gad->fdcur = fdcur; 3723 gad->cur = cur; 3724 3725 /* If we had an incoming odd word and we have any got entries that 3726 are going to use it, consume it, otherwise leave gad->odd at 3727 zero. We might force gad->odd to zero and return the incoming 3728 odd such that it is used by the next range, but then GOT entries 3729 might appear to be out of order and we wouldn't be able to 3730 shorten the GOT by one word if it turns out to end with an 3731 unpaired GOT entry. */ 3732 if (odd && got) 3733 { 3734 gad->odd = odd; 3735 got -= 4; 3736 odd = 0; 3737 } 3738 else 3739 gad->odd = 0; 3740 3741 /* If we're left with an unpaired GOT entry, compute its location 3742 such that we can return it. Otherwise, if got doesn't require an 3743 odd number of words here, either odd was already zero in the 3744 block above, or it was set to zero because got was non-zero, or 3745 got was already zero. In the latter case, we want the value of 3746 odd to carry over to the return statement, so we don't want to 3747 reset odd unless the condition below is true. */ 3748 if (got & 4) 3749 { 3750 odd = cur + got; 3751 got += 4; 3752 } 3753 3754 /* Compute the tentative boundaries of this range. */ 3755 gad->max = cur + got; 3756 gad->min = fdcur - fd; 3757 gad->fdplt = 0; 3758 3759 /* If function descriptors took too much space, wrap some of them 3760 around. */ 3761 if (gad->min < wrapmin) 3762 { 3763 gad->max += wrapmin - gad->min; 3764 gad->min = wrapmin; 3765 } 3766 /* If there is space left and we have function descriptors 3767 referenced in PLT entries that could take advantage of shorter 3768 offsets, place them here. */ 3769 else if (fdplt && gad->min > wrapmin) 3770 { 3771 bfd_vma fds; 3772 if ((bfd_vma) (gad->min - wrapmin) < fdplt) 3773 fds = gad->min - wrapmin; 3774 else 3775 fds = fdplt; 3776 3777 fdplt -= fds; 3778 gad->min -= fds; 3779 gad->fdplt += fds; 3780 } 3781 3782 /* If GOT entries took too much space, wrap some of them around. 3783 This may well cause gad->min to become lower than wrapmin. This 3784 will cause a relocation overflow later on, so we don't have to 3785 report it here . */ 3786 if ((bfd_vma) gad->max > wrap) 3787 { 3788 gad->min -= gad->max - wrap; 3789 gad->max = wrap; 3790 } 3791 /* If there is more space left, try to place some more function 3792 descriptors for PLT entries. */ 3793 else if (fdplt && (bfd_vma) gad->max < wrap) 3794 { 3795 bfd_vma fds; 3796 if ((bfd_vma) (wrap - gad->max) < fdplt) 3797 fds = wrap - gad->max; 3798 else 3799 fds = fdplt; 3800 3801 fdplt -= fds; 3802 gad->max += fds; 3803 gad->fdplt += fds; 3804 } 3805 3806 /* If odd was initially computed as an offset past the wrap point, 3807 wrap it around. */ 3808 if (odd > gad->max) 3809 odd = gad->min + odd - gad->max; 3810 3811 /* _bfinfdpic_get_got_entry() below will always wrap gad->cur if needed 3812 before returning, so do it here too. This guarantees that, 3813 should cur and fdcur meet at the wrap point, they'll both be 3814 equal to min. */ 3815 if (gad->cur == gad->max) 3816 gad->cur = gad->min; 3817 3818 return odd; 3819} 3820 3821/* Compute the location of the next GOT entry, given the allocation 3822 data for a range. */ 3823 3824inline static bfd_signed_vma 3825_bfinfdpic_get_got_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad) 3826{ 3827 bfd_signed_vma ret; 3828 3829 if (gad->odd) 3830 { 3831 /* If there was an odd word left behind, use it. */ 3832 ret = gad->odd; 3833 gad->odd = 0; 3834 } 3835 else 3836 { 3837 /* Otherwise, use the word pointed to by cur, reserve the next 3838 as an odd word, and skip to the next pair of words, possibly 3839 wrapping around. */ 3840 ret = gad->cur; 3841 gad->odd = gad->cur + 4; 3842 gad->cur += 8; 3843 if (gad->cur == gad->max) 3844 gad->cur = gad->min; 3845 } 3846 3847 return ret; 3848} 3849 3850/* Compute the location of the next function descriptor entry in the 3851 GOT, given the allocation data for a range. */ 3852 3853inline static bfd_signed_vma 3854_bfinfdpic_get_fd_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad) 3855{ 3856 /* If we're at the bottom, wrap around, and only then allocate the 3857 next pair of words. */ 3858 if (gad->fdcur == gad->min) 3859 gad->fdcur = gad->max; 3860 return gad->fdcur -= 8; 3861} 3862 3863/* Assign GOT offsets for every GOT entry and function descriptor. 3864 Doing everything in a single pass is tricky. */ 3865 3866static int 3867_bfinfdpic_assign_got_entries (void **entryp, void *info_) 3868{ 3869 struct bfinfdpic_relocs_info *entry = *entryp; 3870 struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_; 3871 3872 if (entry->got17m4) 3873 entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4); 3874 else if (entry->gothilo) 3875 entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo); 3876 3877 if (entry->fdgot17m4) 3878 entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4); 3879 else if (entry->fdgothilo) 3880 entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo); 3881 3882 if (entry->fdgoff17m4) 3883 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4); 3884 else if (entry->plt && dinfo->got17m4.fdplt) 3885 { 3886 dinfo->got17m4.fdplt -= 8; 3887 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4); 3888 } 3889 else if (entry->plt) 3890 { 3891 dinfo->gothilo.fdplt -= 8; 3892 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo); 3893 } 3894 else if (entry->privfd) 3895 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo); 3896 3897 return 1; 3898} 3899 3900/* Assign GOT offsets to private function descriptors used by PLT 3901 entries (or referenced by 32-bit offsets), as well as PLT entries 3902 and lazy PLT entries. */ 3903 3904static int 3905_bfinfdpic_assign_plt_entries (void **entryp, void *info_) 3906{ 3907 struct bfinfdpic_relocs_info *entry = *entryp; 3908 struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_; 3909 3910 /* If this symbol requires a local function descriptor, allocate 3911 one. */ 3912 if (entry->privfd && entry->fd_entry == 0) 3913 { 3914 if (dinfo->got17m4.fdplt) 3915 { 3916 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4); 3917 dinfo->got17m4.fdplt -= 8; 3918 } 3919 else 3920 { 3921 BFD_ASSERT (dinfo->gothilo.fdplt); 3922 entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo); 3923 dinfo->gothilo.fdplt -= 8; 3924 } 3925 } 3926 3927 if (entry->plt) 3928 { 3929 int size; 3930 3931 /* We use the section's raw size to mark the location of the 3932 next PLT entry. */ 3933 entry->plt_entry = bfinfdpic_plt_section (dinfo->g.info)->size; 3934 3935 /* Figure out the length of this PLT entry based on the 3936 addressing mode we need to reach the function descriptor. */ 3937 BFD_ASSERT (entry->fd_entry); 3938 if (entry->fd_entry >= -(1 << (18 - 1)) 3939 && entry->fd_entry + 4 < (1 << (18 - 1))) 3940 size = 10; 3941 else 3942 size = 16; 3943 3944 bfinfdpic_plt_section (dinfo->g.info)->size += size; 3945 } 3946 3947 if (entry->lazyplt) 3948 { 3949 entry->lzplt_entry = dinfo->g.lzplt; 3950 dinfo->g.lzplt += LZPLT_NORMAL_SIZE; 3951 /* If this entry is the one that gets the resolver stub, account 3952 for the additional instruction. */ 3953 if (entry->lzplt_entry % BFINFDPIC_LZPLT_BLOCK_SIZE 3954 == BFINFDPIC_LZPLT_RESOLV_LOC) 3955 dinfo->g.lzplt += LZPLT_RESOLVER_EXTRA; 3956 } 3957 3958 return 1; 3959} 3960 3961/* Cancel out any effects of calling _bfinfdpic_assign_got_entries and 3962 _bfinfdpic_assign_plt_entries. */ 3963 3964static int 3965_bfinfdpic_reset_got_plt_entries (void **entryp, void *ignore ATTRIBUTE_UNUSED) 3966{ 3967 struct bfinfdpic_relocs_info *entry = *entryp; 3968 3969 entry->got_entry = 0; 3970 entry->fdgot_entry = 0; 3971 entry->fd_entry = 0; 3972 entry->plt_entry = (bfd_vma)-1; 3973 entry->lzplt_entry = (bfd_vma)-1; 3974 3975 return 1; 3976} 3977 3978/* Follow indirect and warning hash entries so that each got entry 3979 points to the final symbol definition. P must point to a pointer 3980 to the hash table we're traversing. Since this traversal may 3981 modify the hash table, we set this pointer to NULL to indicate 3982 we've made a potentially-destructive change to the hash table, so 3983 the traversal must be restarted. */ 3984static int 3985_bfinfdpic_resolve_final_relocs_info (void **entryp, void *p) 3986{ 3987 struct bfinfdpic_relocs_info *entry = *entryp; 3988 htab_t *htab = p; 3989 3990 if (entry->symndx == -1) 3991 { 3992 struct elf_link_hash_entry *h = entry->d.h; 3993 struct bfinfdpic_relocs_info *oentry; 3994 3995 while (h->root.type == bfd_link_hash_indirect 3996 || h->root.type == bfd_link_hash_warning) 3997 h = (struct elf_link_hash_entry *)h->root.u.i.link; 3998 3999 if (entry->d.h == h) 4000 return 1; 4001 4002 oentry = bfinfdpic_relocs_info_for_global (*htab, 0, h, entry->addend, 4003 NO_INSERT); 4004 4005 if (oentry) 4006 { 4007 /* Merge the two entries. */ 4008 bfinfdpic_pic_merge_early_relocs_info (oentry, entry); 4009 htab_clear_slot (*htab, entryp); 4010 return 1; 4011 } 4012 4013 entry->d.h = h; 4014 4015 /* If we can't find this entry with the new bfd hash, re-insert 4016 it, and get the traversal restarted. */ 4017 if (! htab_find (*htab, entry)) 4018 { 4019 htab_clear_slot (*htab, entryp); 4020 entryp = htab_find_slot (*htab, entry, INSERT); 4021 if (! *entryp) 4022 *entryp = entry; 4023 /* Abort the traversal, since the whole table may have 4024 moved, and leave it up to the parent to restart the 4025 process. */ 4026 *(htab_t *)p = NULL; 4027 return 0; 4028 } 4029 } 4030 4031 return 1; 4032} 4033 4034/* Compute the total size of the GOT, the PLT, the dynamic relocations 4035 section and the rofixup section. Assign locations for GOT and PLT 4036 entries. */ 4037 4038static bfd_boolean 4039_bfinfdpic_size_got_plt (bfd *output_bfd, 4040 struct _bfinfdpic_dynamic_got_plt_info *gpinfop) 4041{ 4042 bfd_signed_vma odd; 4043 bfd_vma limit; 4044 struct bfd_link_info *info = gpinfop->g.info; 4045 bfd *dynobj = elf_hash_table (info)->dynobj; 4046 4047 memcpy (bfinfdpic_dynamic_got_plt_info (info), &gpinfop->g, 4048 sizeof (gpinfop->g)); 4049 4050 odd = 12; 4051 /* Compute the total size taken by entries in the 18-bit range, 4052 to tell how many PLT function descriptors we can bring into it 4053 without causing it to overflow. */ 4054 limit = odd + gpinfop->g.got17m4 + gpinfop->g.fd17m4; 4055 if (limit < (bfd_vma)1 << 18) 4056 limit = ((bfd_vma)1 << 18) - limit; 4057 else 4058 limit = 0; 4059 if (gpinfop->g.fdplt < limit) 4060 limit = gpinfop->g.fdplt; 4061 4062 /* Determine the ranges of GOT offsets that we can use for each 4063 range of addressing modes. */ 4064 odd = _bfinfdpic_compute_got_alloc_data (&gpinfop->got17m4, 4065 0, 4066 odd, 4067 16, 4068 gpinfop->g.got17m4, 4069 gpinfop->g.fd17m4, 4070 limit, 4071 (bfd_vma)1 << (18-1)); 4072 odd = _bfinfdpic_compute_got_alloc_data (&gpinfop->gothilo, 4073 gpinfop->got17m4.min, 4074 odd, 4075 gpinfop->got17m4.max, 4076 gpinfop->g.gothilo, 4077 gpinfop->g.fdhilo, 4078 gpinfop->g.fdplt - gpinfop->got17m4.fdplt, 4079 (bfd_vma)1 << (32-1)); 4080 4081 /* Now assign (most) GOT offsets. */ 4082 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_got_entries, 4083 gpinfop); 4084 4085 bfinfdpic_got_section (info)->size = gpinfop->gothilo.max 4086 - gpinfop->gothilo.min 4087 /* If an odd word is the last word of the GOT, we don't need this 4088 word to be part of the GOT. */ 4089 - (odd + 4 == gpinfop->gothilo.max ? 4 : 0); 4090 if (bfinfdpic_got_section (info)->size == 0) 4091 bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE; 4092 else if (bfinfdpic_got_section (info)->size == 12 4093 && ! elf_hash_table (info)->dynamic_sections_created) 4094 { 4095 bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE; 4096 bfinfdpic_got_section (info)->size = 0; 4097 } 4098 else 4099 { 4100 bfinfdpic_got_section (info)->contents = 4101 (bfd_byte *) bfd_zalloc (dynobj, 4102 bfinfdpic_got_section (info)->size); 4103 if (bfinfdpic_got_section (info)->contents == NULL) 4104 return FALSE; 4105 } 4106 4107 if (elf_hash_table (info)->dynamic_sections_created) 4108 /* Subtract the number of lzplt entries, since those will generate 4109 relocations in the pltrel section. */ 4110 bfinfdpic_gotrel_section (info)->size = 4111 (gpinfop->g.relocs - gpinfop->g.lzplt / LZPLT_NORMAL_SIZE) 4112 * get_elf_backend_data (output_bfd)->s->sizeof_rel; 4113 else 4114 BFD_ASSERT (gpinfop->g.relocs == 0); 4115 if (bfinfdpic_gotrel_section (info)->size == 0) 4116 bfinfdpic_gotrel_section (info)->flags |= SEC_EXCLUDE; 4117 else 4118 { 4119 bfinfdpic_gotrel_section (info)->contents = 4120 (bfd_byte *) bfd_zalloc (dynobj, 4121 bfinfdpic_gotrel_section (info)->size); 4122 if (bfinfdpic_gotrel_section (info)->contents == NULL) 4123 return FALSE; 4124 } 4125 4126 bfinfdpic_gotfixup_section (info)->size = (gpinfop->g.fixups + 1) * 4; 4127 if (bfinfdpic_gotfixup_section (info)->size == 0) 4128 bfinfdpic_gotfixup_section (info)->flags |= SEC_EXCLUDE; 4129 else 4130 { 4131 bfinfdpic_gotfixup_section (info)->contents = 4132 (bfd_byte *) bfd_zalloc (dynobj, 4133 bfinfdpic_gotfixup_section (info)->size); 4134 if (bfinfdpic_gotfixup_section (info)->contents == NULL) 4135 return FALSE; 4136 } 4137 4138 if (elf_hash_table (info)->dynamic_sections_created) 4139 bfinfdpic_pltrel_section (info)->size = 4140 gpinfop->g.lzplt / LZPLT_NORMAL_SIZE * get_elf_backend_data (output_bfd)->s->sizeof_rel; 4141 if (bfinfdpic_pltrel_section (info)->size == 0) 4142 bfinfdpic_pltrel_section (info)->flags |= SEC_EXCLUDE; 4143 else 4144 { 4145 bfinfdpic_pltrel_section (info)->contents = 4146 (bfd_byte *) bfd_zalloc (dynobj, 4147 bfinfdpic_pltrel_section (info)->size); 4148 if (bfinfdpic_pltrel_section (info)->contents == NULL) 4149 return FALSE; 4150 } 4151 4152 /* Add 4 bytes for every block of at most 65535 lazy PLT entries, 4153 such that there's room for the additional instruction needed to 4154 call the resolver. Since _bfinfdpic_assign_got_entries didn't 4155 account for them, our block size is 4 bytes smaller than the real 4156 block size. */ 4157 if (elf_hash_table (info)->dynamic_sections_created) 4158 { 4159 bfinfdpic_plt_section (info)->size = gpinfop->g.lzplt 4160 + ((gpinfop->g.lzplt + (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) - LZPLT_NORMAL_SIZE) 4161 / (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) * LZPLT_RESOLVER_EXTRA); 4162 } 4163 4164 /* Reset it, such that _bfinfdpic_assign_plt_entries() can use it to 4165 actually assign lazy PLT entries addresses. */ 4166 gpinfop->g.lzplt = 0; 4167 4168 /* Save information that we're going to need to generate GOT and PLT 4169 entries. */ 4170 bfinfdpic_got_initial_offset (info) = -gpinfop->gothilo.min; 4171 4172 if (get_elf_backend_data (output_bfd)->want_got_sym) 4173 elf_hash_table (info)->hgot->root.u.def.value 4174 = bfinfdpic_got_initial_offset (info); 4175 4176 if (elf_hash_table (info)->dynamic_sections_created) 4177 bfinfdpic_plt_initial_offset (info) = 4178 bfinfdpic_plt_section (info)->size; 4179 4180 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_plt_entries, 4181 gpinfop); 4182 4183 /* Allocate the PLT section contents only after 4184 _bfinfdpic_assign_plt_entries has a chance to add the size of the 4185 non-lazy PLT entries. */ 4186 if (bfinfdpic_plt_section (info)->size == 0) 4187 bfinfdpic_plt_section (info)->flags |= SEC_EXCLUDE; 4188 else 4189 { 4190 bfinfdpic_plt_section (info)->contents = 4191 (bfd_byte *) bfd_zalloc (dynobj, 4192 bfinfdpic_plt_section (info)->size); 4193 if (bfinfdpic_plt_section (info)->contents == NULL) 4194 return FALSE; 4195 } 4196 4197 return TRUE; 4198} 4199 4200/* Set the sizes of the dynamic sections. */ 4201 4202static bfd_boolean 4203elf32_bfinfdpic_size_dynamic_sections (bfd *output_bfd, 4204 struct bfd_link_info *info) 4205{ 4206 struct elf_link_hash_table *htab; 4207 bfd *dynobj; 4208 asection *s; 4209 struct _bfinfdpic_dynamic_got_plt_info gpinfo; 4210 4211 htab = elf_hash_table (info); 4212 dynobj = htab->dynobj; 4213 BFD_ASSERT (dynobj != NULL); 4214 4215 if (htab->dynamic_sections_created) 4216 { 4217 /* Set the contents of the .interp section to the interpreter. */ 4218 if (bfd_link_executable (info) && !info->nointerp) 4219 { 4220 s = bfd_get_linker_section (dynobj, ".interp"); 4221 BFD_ASSERT (s != NULL); 4222 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 4223 s->contents = (bfd_byte *) ELF_DYNAMIC_INTERPRETER; 4224 } 4225 } 4226 4227 memset (&gpinfo, 0, sizeof (gpinfo)); 4228 gpinfo.g.info = info; 4229 4230 for (;;) 4231 { 4232 htab_t relocs = bfinfdpic_relocs_info (info); 4233 4234 htab_traverse (relocs, _bfinfdpic_resolve_final_relocs_info, &relocs); 4235 4236 if (relocs == bfinfdpic_relocs_info (info)) 4237 break; 4238 } 4239 4240 htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_count_got_plt_entries, 4241 &gpinfo.g); 4242 4243 /* Allocate space to save the summary information, we're going to 4244 use it if we're doing relaxations. */ 4245 bfinfdpic_dynamic_got_plt_info (info) = bfd_alloc (dynobj, sizeof (gpinfo.g)); 4246 4247 if (!_bfinfdpic_size_got_plt (output_bfd, &gpinfo)) 4248 return FALSE; 4249 4250 if (elf_hash_table (info)->dynamic_sections_created) 4251 { 4252 if (bfinfdpic_got_section (info)->size) 4253 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0)) 4254 return FALSE; 4255 4256 if (bfinfdpic_pltrel_section (info)->size) 4257 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0) 4258 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_REL) 4259 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0)) 4260 return FALSE; 4261 4262 if (bfinfdpic_gotrel_section (info)->size) 4263 if (!_bfd_elf_add_dynamic_entry (info, DT_REL, 0) 4264 || !_bfd_elf_add_dynamic_entry (info, DT_RELSZ, 0) 4265 || !_bfd_elf_add_dynamic_entry (info, DT_RELENT, 4266 sizeof (Elf32_External_Rel))) 4267 return FALSE; 4268 } 4269 4270 s = bfd_get_linker_section (dynobj, ".dynbss"); 4271 if (s && s->size == 0) 4272 s->flags |= SEC_EXCLUDE; 4273 4274 s = bfd_get_linker_section (dynobj, ".rela.bss"); 4275 if (s && s->size == 0) 4276 s->flags |= SEC_EXCLUDE; 4277 4278 return TRUE; 4279} 4280 4281static bfd_boolean 4282elf32_bfinfdpic_always_size_sections (bfd *output_bfd, 4283 struct bfd_link_info *info) 4284{ 4285 if (!bfd_link_relocatable (info) 4286 && !bfd_elf_stack_segment_size (output_bfd, info, 4287 "__stacksize", DEFAULT_STACK_SIZE)) 4288 return FALSE; 4289 4290 return TRUE; 4291} 4292 4293/* Check whether any of the relocations was optimized away, and 4294 subtract it from the relocation or fixup count. */ 4295static bfd_boolean 4296_bfinfdpic_check_discarded_relocs (bfd *abfd, asection *sec, 4297 struct bfd_link_info *info, 4298 bfd_boolean *changed) 4299{ 4300 Elf_Internal_Shdr *symtab_hdr; 4301 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 4302 Elf_Internal_Rela *rel, *erel; 4303 4304 if ((sec->flags & SEC_RELOC) == 0 4305 || sec->reloc_count == 0) 4306 return TRUE; 4307 4308 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4309 sym_hashes = elf_sym_hashes (abfd); 4310 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym); 4311 if (!elf_bad_symtab (abfd)) 4312 sym_hashes_end -= symtab_hdr->sh_info; 4313 4314 rel = elf_section_data (sec)->relocs; 4315 4316 /* Now examine each relocation. */ 4317 for (erel = rel + sec->reloc_count; rel < erel; rel++) 4318 { 4319 struct elf_link_hash_entry *h; 4320 unsigned long r_symndx; 4321 struct bfinfdpic_relocs_info *picrel; 4322 struct _bfinfdpic_dynamic_got_info *dinfo; 4323 4324 if (ELF32_R_TYPE (rel->r_info) != R_BFIN_BYTE4_DATA 4325 && ELF32_R_TYPE (rel->r_info) != R_BFIN_FUNCDESC) 4326 continue; 4327 4328 if (_bfd_elf_section_offset (sec->output_section->owner, 4329 info, sec, rel->r_offset) 4330 != (bfd_vma)-1) 4331 continue; 4332 4333 r_symndx = ELF32_R_SYM (rel->r_info); 4334 if (r_symndx < symtab_hdr->sh_info) 4335 h = NULL; 4336 else 4337 { 4338 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 4339 while (h->root.type == bfd_link_hash_indirect 4340 || h->root.type == bfd_link_hash_warning) 4341 h = (struct elf_link_hash_entry *)h->root.u.i.link; 4342 } 4343 4344 if (h != NULL) 4345 picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info), 4346 abfd, h, 4347 rel->r_addend, NO_INSERT); 4348 else 4349 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info (info), 4350 abfd, r_symndx, 4351 rel->r_addend, NO_INSERT); 4352 4353 if (! picrel) 4354 return FALSE; 4355 4356 *changed = TRUE; 4357 dinfo = bfinfdpic_dynamic_got_plt_info (info); 4358 4359 _bfinfdpic_count_relocs_fixups (picrel, dinfo, TRUE); 4360 if (ELF32_R_TYPE (rel->r_info) == R_BFIN_BYTE4_DATA) 4361 picrel->relocs32--; 4362 else /* we know (ELF32_R_TYPE (rel->r_info) == R_BFIN_FUNCDESC) */ 4363 picrel->relocsfd--; 4364 _bfinfdpic_count_relocs_fixups (picrel, dinfo, FALSE); 4365 } 4366 4367 return TRUE; 4368} 4369 4370static bfd_boolean 4371bfinfdpic_elf_discard_info (bfd *ibfd, 4372 struct elf_reloc_cookie *cookie ATTRIBUTE_UNUSED, 4373 struct bfd_link_info *info) 4374{ 4375 bfd_boolean changed = FALSE; 4376 asection *s; 4377 bfd *obfd = NULL; 4378 4379 /* Account for relaxation of .eh_frame section. */ 4380 for (s = ibfd->sections; s; s = s->next) 4381 if (s->sec_info_type == SEC_INFO_TYPE_EH_FRAME) 4382 { 4383 if (!_bfinfdpic_check_discarded_relocs (ibfd, s, info, &changed)) 4384 return FALSE; 4385 obfd = s->output_section->owner; 4386 } 4387 4388 if (changed) 4389 { 4390 struct _bfinfdpic_dynamic_got_plt_info gpinfo; 4391 4392 memset (&gpinfo, 0, sizeof (gpinfo)); 4393 memcpy (&gpinfo.g, bfinfdpic_dynamic_got_plt_info (info), 4394 sizeof (gpinfo.g)); 4395 4396 /* Clear GOT and PLT assignments. */ 4397 htab_traverse (bfinfdpic_relocs_info (info), 4398 _bfinfdpic_reset_got_plt_entries, 4399 NULL); 4400 4401 if (!_bfinfdpic_size_got_plt (obfd, &gpinfo)) 4402 return FALSE; 4403 } 4404 4405 return TRUE; 4406} 4407 4408static bfd_boolean 4409elf32_bfinfdpic_finish_dynamic_sections (bfd *output_bfd, 4410 struct bfd_link_info *info) 4411{ 4412 bfd *dynobj; 4413 asection *sdyn; 4414 4415 dynobj = elf_hash_table (info)->dynobj; 4416 4417 if (bfinfdpic_got_section (info)) 4418 { 4419 BFD_ASSERT (bfinfdpic_gotrel_section (info)->size 4420 /* PR 17334: It appears that the GOT section can end up 4421 being bigger than the number of relocs. Presumably 4422 because some relocs have been deleted. A test case has 4423 yet to be generated for verify this, but in the meantime 4424 the test below has been changed from == to >= so that 4425 applications can continue to be built. */ 4426 >= (bfinfdpic_gotrel_section (info)->reloc_count 4427 * sizeof (Elf32_External_Rel))); 4428 4429 if (bfinfdpic_gotfixup_section (info)) 4430 { 4431 struct elf_link_hash_entry *hgot = elf_hash_table (info)->hgot; 4432 bfd_vma got_value = hgot->root.u.def.value 4433 + hgot->root.u.def.section->output_section->vma 4434 + hgot->root.u.def.section->output_offset; 4435 4436 _bfinfdpic_add_rofixup (output_bfd, bfinfdpic_gotfixup_section (info), 4437 got_value, 0); 4438 4439 if (bfinfdpic_gotfixup_section (info)->size 4440 != (bfinfdpic_gotfixup_section (info)->reloc_count * 4)) 4441 { 4442 _bfd_error_handler 4443 ("LINKER BUG: .rofixup section size mismatch"); 4444 return FALSE; 4445 } 4446 } 4447 } 4448 if (elf_hash_table (info)->dynamic_sections_created) 4449 { 4450 BFD_ASSERT (bfinfdpic_pltrel_section (info)->size 4451 == (bfinfdpic_pltrel_section (info)->reloc_count 4452 * sizeof (Elf32_External_Rel))); 4453 } 4454 4455 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 4456 4457 if (elf_hash_table (info)->dynamic_sections_created) 4458 { 4459 Elf32_External_Dyn * dyncon; 4460 Elf32_External_Dyn * dynconend; 4461 4462 BFD_ASSERT (sdyn != NULL); 4463 4464 dyncon = (Elf32_External_Dyn *) sdyn->contents; 4465 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 4466 4467 for (; dyncon < dynconend; dyncon++) 4468 { 4469 Elf_Internal_Dyn dyn; 4470 4471 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 4472 4473 switch (dyn.d_tag) 4474 { 4475 default: 4476 break; 4477 4478 case DT_PLTGOT: 4479 dyn.d_un.d_ptr = bfinfdpic_got_section (info)->output_section->vma 4480 + bfinfdpic_got_section (info)->output_offset 4481 + bfinfdpic_got_initial_offset (info); 4482 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4483 break; 4484 4485 case DT_JMPREL: 4486 dyn.d_un.d_ptr = bfinfdpic_pltrel_section (info) 4487 ->output_section->vma 4488 + bfinfdpic_pltrel_section (info)->output_offset; 4489 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4490 break; 4491 4492 case DT_PLTRELSZ: 4493 dyn.d_un.d_val = bfinfdpic_pltrel_section (info)->size; 4494 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4495 break; 4496 } 4497 } 4498 } 4499 4500 return TRUE; 4501} 4502 4503/* Adjust a symbol defined by a dynamic object and referenced by a 4504 regular object. */ 4505 4506static bfd_boolean 4507elf32_bfinfdpic_adjust_dynamic_symbol (struct bfd_link_info *info, 4508 struct elf_link_hash_entry *h) 4509{ 4510 bfd * dynobj; 4511 4512 dynobj = elf_hash_table (info)->dynobj; 4513 4514 /* Make sure we know what is going on here. */ 4515 BFD_ASSERT (dynobj != NULL 4516 && (h->u.weakdef != NULL 4517 || (h->def_dynamic 4518 && h->ref_regular 4519 && !h->def_regular))); 4520 4521 /* If this is a weak symbol, and there is a real definition, the 4522 processor independent code will have arranged for us to see the 4523 real definition first, and we can just use the same value. */ 4524 if (h->u.weakdef != NULL) 4525 { 4526 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 4527 || h->u.weakdef->root.type == bfd_link_hash_defweak); 4528 h->root.u.def.section = h->u.weakdef->root.u.def.section; 4529 h->root.u.def.value = h->u.weakdef->root.u.def.value; 4530 } 4531 4532 return TRUE; 4533} 4534 4535/* Perform any actions needed for dynamic symbols. */ 4536 4537static bfd_boolean 4538elf32_bfinfdpic_finish_dynamic_symbol 4539(bfd *output_bfd ATTRIBUTE_UNUSED, 4540 struct bfd_link_info *info ATTRIBUTE_UNUSED, 4541 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED, 4542 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED) 4543{ 4544 return TRUE; 4545} 4546 4547/* Decide whether to attempt to turn absptr or lsda encodings in 4548 shared libraries into pcrel within the given input section. */ 4549 4550static bfd_boolean 4551bfinfdpic_elf_use_relative_eh_frame 4552(bfd *input_bfd ATTRIBUTE_UNUSED, 4553 struct bfd_link_info *info ATTRIBUTE_UNUSED, 4554 asection *eh_frame_section ATTRIBUTE_UNUSED) 4555{ 4556 /* We can't use PC-relative encodings in FDPIC binaries, in general. */ 4557 return FALSE; 4558} 4559 4560/* Adjust the contents of an eh_frame_hdr section before they're output. */ 4561 4562static bfd_byte 4563bfinfdpic_elf_encode_eh_address (bfd *abfd, 4564 struct bfd_link_info *info, 4565 asection *osec, bfd_vma offset, 4566 asection *loc_sec, bfd_vma loc_offset, 4567 bfd_vma *encoded) 4568{ 4569 struct elf_link_hash_entry *h; 4570 4571 h = elf_hash_table (info)->hgot; 4572 BFD_ASSERT (h && h->root.type == bfd_link_hash_defined); 4573 4574 if (! h || (_bfinfdpic_osec_to_segment (abfd, osec) 4575 == _bfinfdpic_osec_to_segment (abfd, loc_sec->output_section))) 4576 return _bfd_elf_encode_eh_address (abfd, info, osec, offset, 4577 loc_sec, loc_offset, encoded); 4578 4579 BFD_ASSERT (_bfinfdpic_osec_to_segment (abfd, osec) 4580 == (_bfinfdpic_osec_to_segment 4581 (abfd, h->root.u.def.section->output_section))); 4582 4583 *encoded = osec->vma + offset 4584 - (h->root.u.def.value 4585 + h->root.u.def.section->output_section->vma 4586 + h->root.u.def.section->output_offset); 4587 4588 return DW_EH_PE_datarel | DW_EH_PE_sdata4; 4589} 4590 4591 4592 4593/* Look through the relocs for a section during the first phase. 4594 4595 Besides handling virtual table relocs for gc, we have to deal with 4596 all sorts of PIC-related relocations. We describe below the 4597 general plan on how to handle such relocations, even though we only 4598 collect information at this point, storing them in hash tables for 4599 perusal of later passes. 4600 4601 32 relocations are propagated to the linker output when creating 4602 position-independent output. LO16 and HI16 relocations are not 4603 supposed to be encountered in this case. 4604 4605 LABEL16 should always be resolvable by the linker, since it's only 4606 used by branches. 4607 4608 LABEL24, on the other hand, is used by calls. If it turns out that 4609 the target of a call is a dynamic symbol, a PLT entry must be 4610 created for it, which triggers the creation of a private function 4611 descriptor and, unless lazy binding is disabled, a lazy PLT entry. 4612 4613 GPREL relocations require the referenced symbol to be in the same 4614 segment as _gp, but this can only be checked later. 4615 4616 All GOT, GOTOFF and FUNCDESC relocations require a .got section to 4617 exist. LABEL24 might as well, since it may require a PLT entry, 4618 that will require a got. 4619 4620 Non-FUNCDESC GOT relocations require a GOT entry to be created 4621 regardless of whether the symbol is dynamic. However, since a 4622 global symbol that turns out to not be exported may have the same 4623 address of a non-dynamic symbol, we don't assign GOT entries at 4624 this point, such that we can share them in this case. A relocation 4625 for the GOT entry always has to be created, be it to offset a 4626 private symbol by the section load address, be it to get the symbol 4627 resolved dynamically. 4628 4629 FUNCDESC GOT relocations require a GOT entry to be created, and 4630 handled as if a FUNCDESC relocation was applied to the GOT entry in 4631 an object file. 4632 4633 FUNCDESC relocations referencing a symbol that turns out to NOT be 4634 dynamic cause a private function descriptor to be created. The 4635 FUNCDESC relocation then decays to a 32 relocation that points at 4636 the private descriptor. If the symbol is dynamic, the FUNCDESC 4637 relocation is propagated to the linker output, such that the 4638 dynamic linker creates the canonical descriptor, pointing to the 4639 dynamically-resolved definition of the function. 4640 4641 Non-FUNCDESC GOTOFF relocations must always refer to non-dynamic 4642 symbols that are assigned to the same segment as the GOT, but we 4643 can only check this later, after we know the complete set of 4644 symbols defined and/or exported. 4645 4646 FUNCDESC GOTOFF relocations require a function descriptor to be 4647 created and, unless lazy binding is disabled or the symbol is not 4648 dynamic, a lazy PLT entry. Since we can't tell at this point 4649 whether a symbol is going to be dynamic, we have to decide later 4650 whether to create a lazy PLT entry or bind the descriptor directly 4651 to the private function. 4652 4653 FUNCDESC_VALUE relocations are not supposed to be present in object 4654 files, but they may very well be simply propagated to the linker 4655 output, since they have no side effect. 4656 4657 4658 A function descriptor always requires a FUNCDESC_VALUE relocation. 4659 Whether it's in .plt.rel or not depends on whether lazy binding is 4660 enabled and on whether the referenced symbol is dynamic. 4661 4662 The existence of a lazy PLT requires the resolverStub lazy PLT 4663 entry to be present. 4664 4665 4666 As for assignment of GOT, PLT and lazy PLT entries, and private 4667 descriptors, we might do them all sequentially, but we can do 4668 better than that. For example, we can place GOT entries and 4669 private function descriptors referenced using 12-bit operands 4670 closer to the PIC register value, such that these relocations don't 4671 overflow. Those that are only referenced with LO16 relocations 4672 could come next, but we may as well place PLT-required function 4673 descriptors in the 12-bit range to make them shorter. Symbols 4674 referenced with LO16/HI16 may come next, but we may place 4675 additional function descriptors in the 16-bit range if we can 4676 reliably tell that we've already placed entries that are ever 4677 referenced with only LO16. PLT entries are therefore generated as 4678 small as possible, while not introducing relocation overflows in 4679 GOT or FUNCDESC_GOTOFF relocations. Lazy PLT entries could be 4680 generated before or after PLT entries, but not intermingled with 4681 them, such that we can have more lazy PLT entries in range for a 4682 branch to the resolverStub. The resolverStub should be emitted at 4683 the most distant location from the first lazy PLT entry such that 4684 it's still in range for a branch, or closer, if there isn't a need 4685 for so many lazy PLT entries. Additional lazy PLT entries may be 4686 emitted after the resolverStub, as long as branches are still in 4687 range. If the branch goes out of range, longer lazy PLT entries 4688 are emitted. 4689 4690 We could further optimize PLT and lazy PLT entries by giving them 4691 priority in assignment to closer-to-gr17 locations depending on the 4692 number of occurrences of references to them (assuming a function 4693 that's called more often is more important for performance, so its 4694 PLT entry should be faster), or taking hints from the compiler. 4695 Given infinite time and money... :-) */ 4696 4697static bfd_boolean 4698bfinfdpic_check_relocs (bfd *abfd, struct bfd_link_info *info, 4699 asection *sec, const Elf_Internal_Rela *relocs) 4700{ 4701 Elf_Internal_Shdr *symtab_hdr; 4702 struct elf_link_hash_entry **sym_hashes; 4703 const Elf_Internal_Rela *rel; 4704 const Elf_Internal_Rela *rel_end; 4705 bfd *dynobj; 4706 struct bfinfdpic_relocs_info *picrel; 4707 4708 if (bfd_link_relocatable (info)) 4709 return TRUE; 4710 4711 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4712 sym_hashes = elf_sym_hashes (abfd); 4713 4714 dynobj = elf_hash_table (info)->dynobj; 4715 rel_end = relocs + sec->reloc_count; 4716 for (rel = relocs; rel < rel_end; rel++) 4717 { 4718 struct elf_link_hash_entry *h; 4719 unsigned long r_symndx; 4720 4721 r_symndx = ELF32_R_SYM (rel->r_info); 4722 if (r_symndx < symtab_hdr->sh_info) 4723 h = NULL; 4724 else 4725 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 4726 4727 switch (ELF32_R_TYPE (rel->r_info)) 4728 { 4729 case R_BFIN_GOT17M4: 4730 case R_BFIN_GOTHI: 4731 case R_BFIN_GOTLO: 4732 case R_BFIN_FUNCDESC_GOT17M4: 4733 case R_BFIN_FUNCDESC_GOTHI: 4734 case R_BFIN_FUNCDESC_GOTLO: 4735 case R_BFIN_GOTOFF17M4: 4736 case R_BFIN_GOTOFFHI: 4737 case R_BFIN_GOTOFFLO: 4738 case R_BFIN_FUNCDESC_GOTOFF17M4: 4739 case R_BFIN_FUNCDESC_GOTOFFHI: 4740 case R_BFIN_FUNCDESC_GOTOFFLO: 4741 case R_BFIN_FUNCDESC: 4742 case R_BFIN_FUNCDESC_VALUE: 4743 if (! IS_FDPIC (abfd)) 4744 goto bad_reloc; 4745 /* Fall through. */ 4746 case R_BFIN_PCREL24: 4747 case R_BFIN_PCREL24_JUMP_L: 4748 case R_BFIN_BYTE4_DATA: 4749 if (IS_FDPIC (abfd) && ! dynobj) 4750 { 4751 elf_hash_table (info)->dynobj = dynobj = abfd; 4752 if (! _bfin_create_got_section (abfd, info)) 4753 return FALSE; 4754 } 4755 if (! IS_FDPIC (abfd)) 4756 { 4757 picrel = NULL; 4758 break; 4759 } 4760 if (h != NULL) 4761 { 4762 if (h->dynindx == -1) 4763 switch (ELF_ST_VISIBILITY (h->other)) 4764 { 4765 case STV_INTERNAL: 4766 case STV_HIDDEN: 4767 break; 4768 default: 4769 bfd_elf_link_record_dynamic_symbol (info, h); 4770 break; 4771 } 4772 picrel 4773 = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info), 4774 abfd, h, 4775 rel->r_addend, INSERT); 4776 } 4777 else 4778 picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info 4779 (info), abfd, r_symndx, 4780 rel->r_addend, INSERT); 4781 if (! picrel) 4782 return FALSE; 4783 break; 4784 4785 default: 4786 picrel = NULL; 4787 break; 4788 } 4789 4790 switch (ELF32_R_TYPE (rel->r_info)) 4791 { 4792 case R_BFIN_PCREL24: 4793 case R_BFIN_PCREL24_JUMP_L: 4794 if (IS_FDPIC (abfd)) 4795 picrel->call++; 4796 break; 4797 4798 case R_BFIN_FUNCDESC_VALUE: 4799 picrel->relocsfdv++; 4800 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) 4801 picrel->relocs32--; 4802 /* Fall through. */ 4803 4804 case R_BFIN_BYTE4_DATA: 4805 if (! IS_FDPIC (abfd)) 4806 break; 4807 4808 picrel->sym++; 4809 if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) 4810 picrel->relocs32++; 4811 break; 4812 4813 case R_BFIN_GOT17M4: 4814 picrel->got17m4++; 4815 break; 4816 4817 case R_BFIN_GOTHI: 4818 case R_BFIN_GOTLO: 4819 picrel->gothilo++; 4820 break; 4821 4822 case R_BFIN_FUNCDESC_GOT17M4: 4823 picrel->fdgot17m4++; 4824 break; 4825 4826 case R_BFIN_FUNCDESC_GOTHI: 4827 case R_BFIN_FUNCDESC_GOTLO: 4828 picrel->fdgothilo++; 4829 break; 4830 4831 case R_BFIN_GOTOFF17M4: 4832 case R_BFIN_GOTOFFHI: 4833 case R_BFIN_GOTOFFLO: 4834 picrel->gotoff++; 4835 break; 4836 4837 case R_BFIN_FUNCDESC_GOTOFF17M4: 4838 picrel->fdgoff17m4++; 4839 break; 4840 4841 case R_BFIN_FUNCDESC_GOTOFFHI: 4842 case R_BFIN_FUNCDESC_GOTOFFLO: 4843 picrel->fdgoffhilo++; 4844 break; 4845 4846 case R_BFIN_FUNCDESC: 4847 picrel->fd++; 4848 picrel->relocsfd++; 4849 break; 4850 4851 /* This relocation describes the C++ object vtable hierarchy. 4852 Reconstruct it for later use during GC. */ 4853 case R_BFIN_GNU_VTINHERIT: 4854 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 4855 return FALSE; 4856 break; 4857 4858 /* This relocation describes which C++ vtable entries are actually 4859 used. Record for later use during GC. */ 4860 case R_BFIN_GNU_VTENTRY: 4861 BFD_ASSERT (h != NULL); 4862 if (h != NULL 4863 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 4864 return FALSE; 4865 break; 4866 4867 case R_BFIN_HUIMM16: 4868 case R_BFIN_LUIMM16: 4869 case R_BFIN_PCREL12_JUMP_S: 4870 case R_BFIN_PCREL10: 4871 break; 4872 4873 default: 4874 bad_reloc: 4875 _bfd_error_handler 4876 /* xgettext:c-format */ 4877 (_("%B: unsupported relocation type %i"), 4878 abfd, ELF32_R_TYPE (rel->r_info)); 4879 return FALSE; 4880 } 4881 } 4882 4883 return TRUE; 4884} 4885 4886/* Set the right machine number for a Blackfin ELF file. */ 4887 4888static bfd_boolean 4889elf32_bfin_object_p (bfd *abfd) 4890{ 4891 bfd_default_set_arch_mach (abfd, bfd_arch_bfin, 0); 4892 return (((elf_elfheader (abfd)->e_flags & EF_BFIN_FDPIC) != 0) 4893 == (IS_FDPIC (abfd))); 4894} 4895 4896static bfd_boolean 4897elf32_bfin_set_private_flags (bfd * abfd, flagword flags) 4898{ 4899 elf_elfheader (abfd)->e_flags = flags; 4900 elf_flags_init (abfd) = TRUE; 4901 return TRUE; 4902} 4903 4904/* Display the flags field. */ 4905static bfd_boolean 4906elf32_bfin_print_private_bfd_data (bfd * abfd, void * ptr) 4907{ 4908 FILE *file = (FILE *) ptr; 4909 flagword flags; 4910 4911 BFD_ASSERT (abfd != NULL && ptr != NULL); 4912 4913 /* Print normal ELF private data. */ 4914 _bfd_elf_print_private_bfd_data (abfd, ptr); 4915 4916 flags = elf_elfheader (abfd)->e_flags; 4917 4918 /* xgettext:c-format */ 4919 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 4920 4921 if (flags & EF_BFIN_PIC) 4922 fprintf (file, " -fpic"); 4923 4924 if (flags & EF_BFIN_FDPIC) 4925 fprintf (file, " -mfdpic"); 4926 4927 fputc ('\n', file); 4928 4929 return TRUE; 4930} 4931 4932/* Merge backend specific data from an object file to the output 4933 object file when linking. */ 4934 4935static bfd_boolean 4936elf32_bfin_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 4937{ 4938 bfd *obfd = info->output_bfd; 4939 flagword old_flags, new_flags; 4940 bfd_boolean error = FALSE; 4941 4942 new_flags = elf_elfheader (ibfd)->e_flags; 4943 old_flags = elf_elfheader (obfd)->e_flags; 4944 4945 if (new_flags & EF_BFIN_FDPIC) 4946 new_flags &= ~EF_BFIN_PIC; 4947 4948#ifndef DEBUG 4949 if (0) 4950#endif 4951 _bfd_error_handler 4952 ("old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s, filename = %s", 4953 old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no", 4954 bfd_get_filename (ibfd)); 4955 4956 if (!elf_flags_init (obfd)) /* First call, no flags set. */ 4957 { 4958 elf_flags_init (obfd) = TRUE; 4959 elf_elfheader (obfd)->e_flags = new_flags; 4960 } 4961 4962 if (((new_flags & EF_BFIN_FDPIC) == 0) != (! IS_FDPIC (obfd))) 4963 { 4964 error = TRUE; 4965 if (IS_FDPIC (obfd)) 4966 _bfd_error_handler 4967 (_("%s: cannot link non-fdpic object file into fdpic executable"), 4968 bfd_get_filename (ibfd)); 4969 else 4970 _bfd_error_handler 4971 (_("%s: cannot link fdpic object file into non-fdpic executable"), 4972 bfd_get_filename (ibfd)); 4973 } 4974 4975 if (error) 4976 bfd_set_error (bfd_error_bad_value); 4977 4978 return !error; 4979} 4980 4981/* bfin ELF linker hash entry. */ 4982 4983struct bfin_link_hash_entry 4984{ 4985 struct elf_link_hash_entry root; 4986 4987 /* Number of PC relative relocs copied for this symbol. */ 4988 struct bfin_pcrel_relocs_copied *pcrel_relocs_copied; 4989}; 4990 4991/* bfin ELF linker hash table. */ 4992 4993struct bfin_link_hash_table 4994{ 4995 struct elf_link_hash_table root; 4996 4997 /* Small local sym cache. */ 4998 struct sym_cache sym_cache; 4999}; 5000 5001#define bfin_hash_entry(ent) ((struct bfin_link_hash_entry *) (ent)) 5002 5003static struct bfd_hash_entry * 5004bfin_link_hash_newfunc (struct bfd_hash_entry *entry, 5005 struct bfd_hash_table *table, const char *string) 5006{ 5007 struct bfd_hash_entry *ret = entry; 5008 5009 /* Allocate the structure if it has not already been allocated by a 5010 subclass. */ 5011 if (ret == NULL) 5012 ret = bfd_hash_allocate (table, sizeof (struct bfin_link_hash_entry)); 5013 if (ret == NULL) 5014 return ret; 5015 5016 /* Call the allocation method of the superclass. */ 5017 ret = _bfd_elf_link_hash_newfunc (ret, table, string); 5018 if (ret != NULL) 5019 bfin_hash_entry (ret)->pcrel_relocs_copied = NULL; 5020 5021 return ret; 5022} 5023 5024/* Create an bfin ELF linker hash table. */ 5025 5026static struct bfd_link_hash_table * 5027bfin_link_hash_table_create (bfd * abfd) 5028{ 5029 struct bfin_link_hash_table *ret; 5030 bfd_size_type amt = sizeof (struct bfin_link_hash_table); 5031 5032 ret = bfd_zmalloc (amt); 5033 if (ret == NULL) 5034 return NULL; 5035 5036 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, 5037 bfin_link_hash_newfunc, 5038 sizeof (struct elf_link_hash_entry), 5039 BFIN_ELF_DATA)) 5040 { 5041 free (ret); 5042 return NULL; 5043 } 5044 5045 ret->sym_cache.abfd = NULL; 5046 5047 return &ret->root.root; 5048} 5049 5050/* The size in bytes of an entry in the procedure linkage table. */ 5051 5052/* Finish up the dynamic sections. */ 5053 5054static bfd_boolean 5055bfin_finish_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED, 5056 struct bfd_link_info *info) 5057{ 5058 bfd *dynobj; 5059 asection *sdyn; 5060 5061 dynobj = elf_hash_table (info)->dynobj; 5062 5063 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 5064 5065 if (elf_hash_table (info)->dynamic_sections_created) 5066 { 5067 Elf32_External_Dyn *dyncon, *dynconend; 5068 5069 BFD_ASSERT (sdyn != NULL); 5070 5071 dyncon = (Elf32_External_Dyn *) sdyn->contents; 5072 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 5073 for (; dyncon < dynconend; dyncon++) 5074 { 5075 Elf_Internal_Dyn dyn; 5076 5077 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 5078 5079 } 5080 5081 } 5082 return TRUE; 5083} 5084 5085/* Finish up dynamic symbol handling. We set the contents of various 5086 dynamic sections here. */ 5087 5088static bfd_boolean 5089bfin_finish_dynamic_symbol (bfd * output_bfd, 5090 struct bfd_link_info *info, 5091 struct elf_link_hash_entry *h, 5092 Elf_Internal_Sym * sym) 5093{ 5094 if (h->got.offset != (bfd_vma) - 1) 5095 { 5096 asection *sgot; 5097 asection *srela; 5098 Elf_Internal_Rela rela; 5099 bfd_byte *loc; 5100 5101 /* This symbol has an entry in the global offset table. 5102 Set it up. */ 5103 5104 sgot = elf_hash_table (info)->sgot; 5105 srela = elf_hash_table (info)->srelgot; 5106 BFD_ASSERT (sgot != NULL && srela != NULL); 5107 5108 rela.r_offset = (sgot->output_section->vma 5109 + sgot->output_offset 5110 + (h->got.offset & ~(bfd_vma) 1)); 5111 5112 /* If this is a -Bsymbolic link, and the symbol is defined 5113 locally, we just want to emit a RELATIVE reloc. Likewise if 5114 the symbol was forced to be local because of a version file. 5115 The entry in the global offset table will already have been 5116 initialized in the relocate_section function. */ 5117 if (bfd_link_pic (info) 5118 && (info->symbolic 5119 || h->dynindx == -1 || h->forced_local) && h->def_regular) 5120 { 5121 _bfd_error_handler (_("*** check this relocation %s"), 5122 __FUNCTION__); 5123 rela.r_info = ELF32_R_INFO (0, R_BFIN_PCREL24); 5124 rela.r_addend = bfd_get_signed_32 (output_bfd, 5125 (sgot->contents 5126 + 5127 (h->got. 5128 offset & ~(bfd_vma) 1))); 5129 } 5130 else 5131 { 5132 bfd_put_32 (output_bfd, (bfd_vma) 0, 5133 sgot->contents + (h->got.offset & ~(bfd_vma) 1)); 5134 rela.r_info = ELF32_R_INFO (h->dynindx, R_BFIN_GOT); 5135 rela.r_addend = 0; 5136 } 5137 5138 loc = srela->contents; 5139 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 5140 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 5141 } 5142 5143 if (h->needs_copy) 5144 { 5145 BFD_ASSERT (0); 5146 } 5147 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 5148 if (strcmp (h->root.root.string, "__DYNAMIC") == 0 5149 || h == elf_hash_table (info)->hgot) 5150 sym->st_shndx = SHN_ABS; 5151 5152 return TRUE; 5153} 5154 5155/* Adjust a symbol defined by a dynamic object and referenced by a 5156 regular object. The current definition is in some section of the 5157 dynamic object, but we're not including those sections. We have to 5158 change the definition to something the rest of the link can 5159 understand. */ 5160 5161static bfd_boolean 5162bfin_adjust_dynamic_symbol (struct bfd_link_info *info, 5163 struct elf_link_hash_entry *h) 5164{ 5165 bfd *dynobj; 5166 asection *s; 5167 unsigned int power_of_two; 5168 5169 dynobj = elf_hash_table (info)->dynobj; 5170 5171 /* Make sure we know what is going on here. */ 5172 BFD_ASSERT (dynobj != NULL 5173 && (h->needs_plt 5174 || h->u.weakdef != NULL 5175 || (h->def_dynamic && h->ref_regular && !h->def_regular))); 5176 5177 /* If this is a function, put it in the procedure linkage table. We 5178 will fill in the contents of the procedure linkage table later, 5179 when we know the address of the .got section. */ 5180 if (h->type == STT_FUNC || h->needs_plt) 5181 { 5182 BFD_ASSERT(0); 5183 } 5184 5185 /* If this is a weak symbol, and there is a real definition, the 5186 processor independent code will have arranged for us to see the 5187 real definition first, and we can just use the same value. */ 5188 if (h->u.weakdef != NULL) 5189 { 5190 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 5191 || h->u.weakdef->root.type == bfd_link_hash_defweak); 5192 h->root.u.def.section = h->u.weakdef->root.u.def.section; 5193 h->root.u.def.value = h->u.weakdef->root.u.def.value; 5194 return TRUE; 5195 } 5196 5197 /* This is a reference to a symbol defined by a dynamic object which 5198 is not a function. */ 5199 5200 /* If we are creating a shared library, we must presume that the 5201 only references to the symbol are via the global offset table. 5202 For such cases we need not do anything here; the relocations will 5203 be handled correctly by relocate_section. */ 5204 if (bfd_link_pic (info)) 5205 return TRUE; 5206 5207 /* We must allocate the symbol in our .dynbss section, which will 5208 become part of the .bss section of the executable. There will be 5209 an entry for this symbol in the .dynsym section. The dynamic 5210 object will contain position independent code, so all references 5211 from the dynamic object to this symbol will go through the global 5212 offset table. The dynamic linker will use the .dynsym entry to 5213 determine the address it must put in the global offset table, so 5214 both the dynamic object and the regular object will refer to the 5215 same memory location for the variable. */ 5216 5217 s = bfd_get_linker_section (dynobj, ".dynbss"); 5218 BFD_ASSERT (s != NULL); 5219 5220#if 0 /* Bfin does not currently have a COPY reloc. */ 5221 /* We must generate a R_BFIN_COPY reloc to tell the dynamic linker to 5222 copy the initial value out of the dynamic object and into the 5223 runtime process image. We need to remember the offset into the 5224 .rela.bss section we are going to use. */ 5225 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 5226 { 5227 asection *srel; 5228 5229 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 5230 BFD_ASSERT (srel != NULL); 5231 srel->size += sizeof (Elf32_External_Rela); 5232 h->needs_copy = 1; 5233 } 5234#else 5235 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 5236 { 5237 _bfd_error_handler (_("the bfin target does not currently support the generation of copy relocations")); 5238 return FALSE; 5239 } 5240#endif 5241 /* We need to figure out the alignment required for this symbol. I 5242 have no idea how ELF linkers handle this. */ 5243 power_of_two = bfd_log2 (h->size); 5244 if (power_of_two > 3) 5245 power_of_two = 3; 5246 5247 /* Apply the required alignment. */ 5248 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 5249 if (power_of_two > bfd_get_section_alignment (dynobj, s)) 5250 { 5251 if (!bfd_set_section_alignment (dynobj, s, power_of_two)) 5252 return FALSE; 5253 } 5254 5255 /* Define the symbol as being at this point in the section. */ 5256 h->root.u.def.section = s; 5257 h->root.u.def.value = s->size; 5258 5259 /* Increment the section size to make room for the symbol. */ 5260 s->size += h->size; 5261 5262 return TRUE; 5263} 5264 5265/* The bfin linker needs to keep track of the number of relocs that it 5266 decides to copy in check_relocs for each symbol. This is so that it 5267 can discard PC relative relocs if it doesn't need them when linking 5268 with -Bsymbolic. We store the information in a field extending the 5269 regular ELF linker hash table. */ 5270 5271/* This structure keeps track of the number of PC relative relocs we have 5272 copied for a given symbol. */ 5273 5274struct bfin_pcrel_relocs_copied 5275{ 5276 /* Next section. */ 5277 struct bfin_pcrel_relocs_copied *next; 5278 /* A section in dynobj. */ 5279 asection *section; 5280 /* Number of relocs copied in this section. */ 5281 bfd_size_type count; 5282}; 5283 5284/* This function is called via elf_link_hash_traverse if we are 5285 creating a shared object. In the -Bsymbolic case it discards the 5286 space allocated to copy PC relative relocs against symbols which 5287 are defined in regular objects. For the normal shared case, it 5288 discards space for pc-relative relocs that have become local due to 5289 symbol visibility changes. We allocated space for them in the 5290 check_relocs routine, but we won't fill them in in the 5291 relocate_section routine. 5292 5293 We also check whether any of the remaining relocations apply 5294 against a readonly section, and set the DF_TEXTREL flag in this 5295 case. */ 5296 5297static bfd_boolean 5298bfin_discard_copies (struct elf_link_hash_entry *h, void * inf) 5299{ 5300 struct bfd_link_info *info = (struct bfd_link_info *) inf; 5301 struct bfin_pcrel_relocs_copied *s; 5302 5303 if (!h->def_regular || (!info->symbolic && !h->forced_local)) 5304 { 5305 if ((info->flags & DF_TEXTREL) == 0) 5306 { 5307 /* Look for relocations against read-only sections. */ 5308 for (s = bfin_hash_entry (h)->pcrel_relocs_copied; 5309 s != NULL; s = s->next) 5310 if ((s->section->flags & SEC_READONLY) != 0) 5311 { 5312 info->flags |= DF_TEXTREL; 5313 break; 5314 } 5315 } 5316 5317 return TRUE; 5318 } 5319 5320 for (s = bfin_hash_entry (h)->pcrel_relocs_copied; 5321 s != NULL; s = s->next) 5322 s->section->size -= s->count * sizeof (Elf32_External_Rela); 5323 5324 return TRUE; 5325} 5326 5327static bfd_boolean 5328bfin_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED, 5329 struct bfd_link_info *info) 5330{ 5331 bfd *dynobj; 5332 asection *s; 5333 bfd_boolean relocs; 5334 5335 dynobj = elf_hash_table (info)->dynobj; 5336 BFD_ASSERT (dynobj != NULL); 5337 5338 if (elf_hash_table (info)->dynamic_sections_created) 5339 { 5340 /* Set the contents of the .interp section to the interpreter. */ 5341 if (bfd_link_executable (info)) 5342 { 5343 s = bfd_get_linker_section (dynobj, ".interp"); 5344 BFD_ASSERT (s != NULL); 5345 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 5346 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 5347 } 5348 } 5349 else 5350 { 5351 /* We may have created entries in the .rela.got section. 5352 However, if we are not creating the dynamic sections, we will 5353 not actually use these entries. Reset the size of .rela.got, 5354 which will cause it to get stripped from the output file 5355 below. */ 5356 s = elf_hash_table (info)->srelgot; 5357 if (s != NULL) 5358 s->size = 0; 5359 } 5360 5361 /* If this is a -Bsymbolic shared link, then we need to discard all 5362 PC relative relocs against symbols defined in a regular object. 5363 For the normal shared case we discard the PC relative relocs 5364 against symbols that have become local due to visibility changes. 5365 We allocated space for them in the check_relocs routine, but we 5366 will not fill them in in the relocate_section routine. */ 5367 if (bfd_link_pic (info)) 5368 elf_link_hash_traverse (elf_hash_table (info), 5369 bfin_discard_copies, info); 5370 5371 /* The check_relocs and adjust_dynamic_symbol entry points have 5372 determined the sizes of the various dynamic sections. Allocate 5373 memory for them. */ 5374 relocs = FALSE; 5375 for (s = dynobj->sections; s != NULL; s = s->next) 5376 { 5377 const char *name; 5378 bfd_boolean strip; 5379 5380 if ((s->flags & SEC_LINKER_CREATED) == 0) 5381 continue; 5382 5383 /* It's OK to base decisions on the section name, because none 5384 of the dynobj section names depend upon the input files. */ 5385 name = bfd_get_section_name (dynobj, s); 5386 5387 strip = FALSE; 5388 5389 if (CONST_STRNEQ (name, ".rela")) 5390 { 5391 if (s->size == 0) 5392 { 5393 /* If we don't need this section, strip it from the 5394 output file. This is mostly to handle .rela.bss and 5395 .rela.plt. We must create both sections in 5396 create_dynamic_sections, because they must be created 5397 before the linker maps input sections to output 5398 sections. The linker does that before 5399 adjust_dynamic_symbol is called, and it is that 5400 function which decides whether anything needs to go 5401 into these sections. */ 5402 strip = TRUE; 5403 } 5404 else 5405 { 5406 relocs = TRUE; 5407 5408 /* We use the reloc_count field as a counter if we need 5409 to copy relocs into the output file. */ 5410 s->reloc_count = 0; 5411 } 5412 } 5413 else if (! CONST_STRNEQ (name, ".got")) 5414 { 5415 /* It's not one of our sections, so don't allocate space. */ 5416 continue; 5417 } 5418 5419 if (strip) 5420 { 5421 s->flags |= SEC_EXCLUDE; 5422 continue; 5423 } 5424 5425 /* Allocate memory for the section contents. */ 5426 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 5427 Unused entries should be reclaimed before the section's contents 5428 are written out, but at the moment this does not happen. Thus in 5429 order to prevent writing out garbage, we initialise the section's 5430 contents to zero. */ 5431 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 5432 if (s->contents == NULL && s->size != 0) 5433 return FALSE; 5434 } 5435 5436 if (elf_hash_table (info)->dynamic_sections_created) 5437 { 5438 /* Add some entries to the .dynamic section. We fill in the 5439 values later, in bfin_finish_dynamic_sections, but we 5440 must add the entries now so that we get the correct size for 5441 the .dynamic section. The DT_DEBUG entry is filled in by the 5442 dynamic linker and used by the debugger. */ 5443#define add_dynamic_entry(TAG, VAL) \ 5444 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 5445 5446 if (!bfd_link_pic (info)) 5447 { 5448 if (!add_dynamic_entry (DT_DEBUG, 0)) 5449 return FALSE; 5450 } 5451 5452 5453 if (relocs) 5454 { 5455 if (!add_dynamic_entry (DT_RELA, 0) 5456 || !add_dynamic_entry (DT_RELASZ, 0) 5457 || !add_dynamic_entry (DT_RELAENT, 5458 sizeof (Elf32_External_Rela))) 5459 return FALSE; 5460 } 5461 5462 if ((info->flags & DF_TEXTREL) != 0) 5463 { 5464 if (!add_dynamic_entry (DT_TEXTREL, 0)) 5465 return FALSE; 5466 } 5467 } 5468#undef add_dynamic_entry 5469 5470 return TRUE; 5471} 5472 5473/* Given a .data section and a .emreloc in-memory section, store 5474 relocation information into the .emreloc section which can be 5475 used at runtime to relocate the section. This is called by the 5476 linker when the --embedded-relocs switch is used. This is called 5477 after the add_symbols entry point has been called for all the 5478 objects, and before the final_link entry point is called. */ 5479 5480bfd_boolean 5481bfd_bfin_elf32_create_embedded_relocs (bfd *abfd, 5482 struct bfd_link_info *info, 5483 asection *datasec, 5484 asection *relsec, 5485 char **errmsg) 5486{ 5487 Elf_Internal_Shdr *symtab_hdr; 5488 Elf_Internal_Sym *isymbuf = NULL; 5489 Elf_Internal_Rela *internal_relocs = NULL; 5490 Elf_Internal_Rela *irel, *irelend; 5491 bfd_byte *p; 5492 bfd_size_type amt; 5493 5494 BFD_ASSERT (! bfd_link_relocatable (info)); 5495 5496 *errmsg = NULL; 5497 5498 if (datasec->reloc_count == 0) 5499 return TRUE; 5500 5501 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 5502 5503 /* Get a copy of the native relocations. */ 5504 internal_relocs = (_bfd_elf_link_read_relocs 5505 (abfd, datasec, NULL, (Elf_Internal_Rela *) NULL, 5506 info->keep_memory)); 5507 if (internal_relocs == NULL) 5508 goto error_return; 5509 5510 amt = (bfd_size_type) datasec->reloc_count * 12; 5511 relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); 5512 if (relsec->contents == NULL) 5513 goto error_return; 5514 5515 p = relsec->contents; 5516 5517 irelend = internal_relocs + datasec->reloc_count; 5518 for (irel = internal_relocs; irel < irelend; irel++, p += 12) 5519 { 5520 asection *targetsec; 5521 5522 /* We are going to write a four byte longword into the runtime 5523 reloc section. The longword will be the address in the data 5524 section which must be relocated. It is followed by the name 5525 of the target section NUL-padded or truncated to 8 5526 characters. */ 5527 5528 /* We can only relocate absolute longword relocs at run time. */ 5529 if (ELF32_R_TYPE (irel->r_info) != (int) R_BFIN_BYTE4_DATA) 5530 { 5531 *errmsg = _("unsupported reloc type"); 5532 bfd_set_error (bfd_error_bad_value); 5533 goto error_return; 5534 } 5535 5536 /* Get the target section referred to by the reloc. */ 5537 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 5538 { 5539 /* A local symbol. */ 5540 Elf_Internal_Sym *isym; 5541 5542 /* Read this BFD's local symbols if we haven't done so already. */ 5543 if (isymbuf == NULL) 5544 { 5545 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 5546 if (isymbuf == NULL) 5547 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 5548 symtab_hdr->sh_info, 0, 5549 NULL, NULL, NULL); 5550 if (isymbuf == NULL) 5551 goto error_return; 5552 } 5553 5554 isym = isymbuf + ELF32_R_SYM (irel->r_info); 5555 targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 5556 } 5557 else 5558 { 5559 unsigned long indx; 5560 struct elf_link_hash_entry *h; 5561 5562 /* An external symbol. */ 5563 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 5564 h = elf_sym_hashes (abfd)[indx]; 5565 BFD_ASSERT (h != NULL); 5566 if (h->root.type == bfd_link_hash_defined 5567 || h->root.type == bfd_link_hash_defweak) 5568 targetsec = h->root.u.def.section; 5569 else 5570 targetsec = NULL; 5571 } 5572 5573 bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); 5574 memset (p + 4, 0, 8); 5575 if (targetsec != NULL) 5576 strncpy ((char *) p + 4, targetsec->output_section->name, 8); 5577 } 5578 5579 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 5580 free (isymbuf); 5581 if (internal_relocs != NULL 5582 && elf_section_data (datasec)->relocs != internal_relocs) 5583 free (internal_relocs); 5584 return TRUE; 5585 5586error_return: 5587 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) 5588 free (isymbuf); 5589 if (internal_relocs != NULL 5590 && elf_section_data (datasec)->relocs != internal_relocs) 5591 free (internal_relocs); 5592 return FALSE; 5593} 5594 5595struct bfd_elf_special_section const elf32_bfin_special_sections[] = 5596{ 5597 { ".l1.text", 8, -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR }, 5598 { ".l1.data", 8, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 5599 { NULL, 0, 0, 0, 0 } 5600}; 5601 5602 5603#define TARGET_LITTLE_SYM bfin_elf32_vec 5604#define TARGET_LITTLE_NAME "elf32-bfin" 5605#define ELF_ARCH bfd_arch_bfin 5606#define ELF_TARGET_ID BFIN_ELF_DATA 5607#define ELF_MACHINE_CODE EM_BLACKFIN 5608#define ELF_MAXPAGESIZE 0x1000 5609#define elf_symbol_leading_char '_' 5610 5611#define bfd_elf32_bfd_reloc_type_lookup bfin_bfd_reloc_type_lookup 5612#define bfd_elf32_bfd_reloc_name_lookup \ 5613 bfin_bfd_reloc_name_lookup 5614#define elf_info_to_howto bfin_info_to_howto 5615#define elf_info_to_howto_rel 0 5616#define elf_backend_object_p elf32_bfin_object_p 5617 5618#define bfd_elf32_bfd_is_local_label_name \ 5619 bfin_is_local_label_name 5620#define bfin_hash_table(p) \ 5621 ((struct bfin_link_hash_table *) (p)->hash) 5622 5623 5624 5625#define elf_backend_create_dynamic_sections \ 5626 _bfd_elf_create_dynamic_sections 5627#define bfd_elf32_bfd_link_hash_table_create \ 5628 bfin_link_hash_table_create 5629#define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link 5630 5631#define elf_backend_check_relocs bfin_check_relocs 5632#define elf_backend_adjust_dynamic_symbol \ 5633 bfin_adjust_dynamic_symbol 5634#define elf_backend_size_dynamic_sections \ 5635 bfin_size_dynamic_sections 5636#define elf_backend_relocate_section bfin_relocate_section 5637#define elf_backend_finish_dynamic_symbol \ 5638 bfin_finish_dynamic_symbol 5639#define elf_backend_finish_dynamic_sections \ 5640 bfin_finish_dynamic_sections 5641#define elf_backend_gc_mark_hook bfin_gc_mark_hook 5642#define elf_backend_gc_sweep_hook bfin_gc_sweep_hook 5643#define bfd_elf32_bfd_merge_private_bfd_data \ 5644 elf32_bfin_merge_private_bfd_data 5645#define bfd_elf32_bfd_set_private_flags \ 5646 elf32_bfin_set_private_flags 5647#define bfd_elf32_bfd_print_private_bfd_data \ 5648 elf32_bfin_print_private_bfd_data 5649#define elf_backend_final_write_processing \ 5650 elf32_bfin_final_write_processing 5651#define elf_backend_reloc_type_class elf32_bfin_reloc_type_class 5652#define elf_backend_stack_align 8 5653#define elf_backend_can_gc_sections 1 5654#define elf_backend_special_sections elf32_bfin_special_sections 5655#define elf_backend_can_refcount 1 5656#define elf_backend_want_got_plt 0 5657#define elf_backend_plt_readonly 1 5658#define elf_backend_want_plt_sym 0 5659#define elf_backend_got_header_size 12 5660#define elf_backend_rela_normal 1 5661 5662#include "elf32-target.h" 5663 5664#undef TARGET_LITTLE_SYM 5665#define TARGET_LITTLE_SYM bfin_elf32_fdpic_vec 5666#undef TARGET_LITTLE_NAME 5667#define TARGET_LITTLE_NAME "elf32-bfinfdpic" 5668#undef elf32_bed 5669#define elf32_bed elf32_bfinfdpic_bed 5670 5671#undef elf_backend_gc_sweep_hook 5672#define elf_backend_gc_sweep_hook bfinfdpic_gc_sweep_hook 5673 5674#undef elf_backend_got_header_size 5675#define elf_backend_got_header_size 0 5676 5677#undef elf_backend_relocate_section 5678#define elf_backend_relocate_section bfinfdpic_relocate_section 5679#undef elf_backend_check_relocs 5680#define elf_backend_check_relocs bfinfdpic_check_relocs 5681 5682#undef bfd_elf32_bfd_link_hash_table_create 5683#define bfd_elf32_bfd_link_hash_table_create \ 5684 bfinfdpic_elf_link_hash_table_create 5685#undef elf_backend_always_size_sections 5686#define elf_backend_always_size_sections \ 5687 elf32_bfinfdpic_always_size_sections 5688 5689#undef elf_backend_create_dynamic_sections 5690#define elf_backend_create_dynamic_sections \ 5691 elf32_bfinfdpic_create_dynamic_sections 5692#undef elf_backend_adjust_dynamic_symbol 5693#define elf_backend_adjust_dynamic_symbol \ 5694 elf32_bfinfdpic_adjust_dynamic_symbol 5695#undef elf_backend_size_dynamic_sections 5696#define elf_backend_size_dynamic_sections \ 5697 elf32_bfinfdpic_size_dynamic_sections 5698#undef elf_backend_finish_dynamic_symbol 5699#define elf_backend_finish_dynamic_symbol \ 5700 elf32_bfinfdpic_finish_dynamic_symbol 5701#undef elf_backend_finish_dynamic_sections 5702#define elf_backend_finish_dynamic_sections \ 5703 elf32_bfinfdpic_finish_dynamic_sections 5704 5705#undef elf_backend_discard_info 5706#define elf_backend_discard_info \ 5707 bfinfdpic_elf_discard_info 5708#undef elf_backend_can_make_relative_eh_frame 5709#define elf_backend_can_make_relative_eh_frame \ 5710 bfinfdpic_elf_use_relative_eh_frame 5711#undef elf_backend_can_make_lsda_relative_eh_frame 5712#define elf_backend_can_make_lsda_relative_eh_frame \ 5713 bfinfdpic_elf_use_relative_eh_frame 5714#undef elf_backend_encode_eh_address 5715#define elf_backend_encode_eh_address \ 5716 bfinfdpic_elf_encode_eh_address 5717 5718#undef elf_backend_may_use_rel_p 5719#define elf_backend_may_use_rel_p 1 5720#undef elf_backend_may_use_rela_p 5721#define elf_backend_may_use_rela_p 1 5722/* We use REL for dynamic relocations only. */ 5723#undef elf_backend_default_use_rela_p 5724#define elf_backend_default_use_rela_p 1 5725 5726#undef elf_backend_omit_section_dynsym 5727#define elf_backend_omit_section_dynsym _bfinfdpic_link_omit_section_dynsym 5728 5729#include "elf32-target.h" 5730