1/* BFD back-end for ALPHA Extended-Coff files. 2 Copyright (C) 1993-2022 Free Software Foundation, Inc. 3 Modified from coff-mips.c by Steve Chamberlain <sac@cygnus.com> and 4 Ian Lance Taylor <ian@cygnus.com>. 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23#include "sysdep.h" 24#include "bfd.h" 25#include "bfdlink.h" 26#include "libbfd.h" 27#include "coff/internal.h" 28#include "coff/sym.h" 29#include "coff/symconst.h" 30#include "coff/ecoff.h" 31#include "coff/alpha.h" 32#include "aout/ar.h" 33#include "libcoff.h" 34#include "libecoff.h" 35 36/* Prototypes for static functions. */ 37 38 39 40/* ECOFF has COFF sections, but the debugging information is stored in 41 a completely different format. ECOFF targets use some of the 42 swapping routines from coffswap.h, and some of the generic COFF 43 routines in coffgen.c, but, unlike the real COFF targets, do not 44 use coffcode.h itself. 45 46 Get the generic COFF swapping routines, except for the reloc, 47 symbol, and lineno ones. Give them ecoff names. Define some 48 accessor macros for the large sizes used for Alpha ECOFF. */ 49 50#define GET_FILEHDR_SYMPTR H_GET_64 51#define PUT_FILEHDR_SYMPTR H_PUT_64 52#define GET_AOUTHDR_TSIZE H_GET_64 53#define PUT_AOUTHDR_TSIZE H_PUT_64 54#define GET_AOUTHDR_DSIZE H_GET_64 55#define PUT_AOUTHDR_DSIZE H_PUT_64 56#define GET_AOUTHDR_BSIZE H_GET_64 57#define PUT_AOUTHDR_BSIZE H_PUT_64 58#define GET_AOUTHDR_ENTRY H_GET_64 59#define PUT_AOUTHDR_ENTRY H_PUT_64 60#define GET_AOUTHDR_TEXT_START H_GET_64 61#define PUT_AOUTHDR_TEXT_START H_PUT_64 62#define GET_AOUTHDR_DATA_START H_GET_64 63#define PUT_AOUTHDR_DATA_START H_PUT_64 64#define GET_SCNHDR_PADDR H_GET_64 65#define PUT_SCNHDR_PADDR H_PUT_64 66#define GET_SCNHDR_VADDR H_GET_64 67#define PUT_SCNHDR_VADDR H_PUT_64 68#define GET_SCNHDR_SIZE H_GET_64 69#define PUT_SCNHDR_SIZE H_PUT_64 70#define GET_SCNHDR_SCNPTR H_GET_64 71#define PUT_SCNHDR_SCNPTR H_PUT_64 72#define GET_SCNHDR_RELPTR H_GET_64 73#define PUT_SCNHDR_RELPTR H_PUT_64 74#define GET_SCNHDR_LNNOPTR H_GET_64 75#define PUT_SCNHDR_LNNOPTR H_PUT_64 76 77#define ALPHAECOFF 78 79#define NO_COFF_RELOCS 80#define NO_COFF_SYMBOLS 81#define NO_COFF_LINENOS 82#define coff_swap_filehdr_in alpha_ecoff_swap_filehdr_in 83#define coff_swap_filehdr_out alpha_ecoff_swap_filehdr_out 84#define coff_swap_aouthdr_in alpha_ecoff_swap_aouthdr_in 85#define coff_swap_aouthdr_out alpha_ecoff_swap_aouthdr_out 86#define coff_swap_scnhdr_in alpha_ecoff_swap_scnhdr_in 87#define coff_swap_scnhdr_out alpha_ecoff_swap_scnhdr_out 88#include "coffswap.h" 89 90/* Get the ECOFF swapping routines. */ 91#define ECOFF_64 92#include "ecoffswap.h" 93 94/* How to process the various reloc types. */ 95 96static bfd_reloc_status_type 97reloc_nil (bfd *abfd ATTRIBUTE_UNUSED, 98 arelent *reloc ATTRIBUTE_UNUSED, 99 asymbol *sym ATTRIBUTE_UNUSED, 100 void * data ATTRIBUTE_UNUSED, 101 asection *sec ATTRIBUTE_UNUSED, 102 bfd *output_bfd ATTRIBUTE_UNUSED, 103 char **error_message ATTRIBUTE_UNUSED) 104{ 105 return bfd_reloc_ok; 106} 107 108/* In case we're on a 32-bit machine, construct a 64-bit "-1" value 109 from smaller values. Start with zero, widen, *then* decrement. */ 110#define MINUS_ONE (((bfd_vma)0) - 1) 111 112static reloc_howto_type alpha_howto_table[] = 113{ 114 /* Reloc type 0 is ignored by itself. However, it appears after a 115 GPDISP reloc to identify the location where the low order 16 bits 116 of the gp register are loaded. */ 117 HOWTO (ALPHA_R_IGNORE, /* type */ 118 0, /* rightshift */ 119 1, /* size */ 120 8, /* bitsize */ 121 true, /* pc_relative */ 122 0, /* bitpos */ 123 complain_overflow_dont, /* complain_on_overflow */ 124 reloc_nil, /* special_function */ 125 "IGNORE", /* name */ 126 true, /* partial_inplace */ 127 0, /* src_mask */ 128 0, /* dst_mask */ 129 true), /* pcrel_offset */ 130 131 /* A 32 bit reference to a symbol. */ 132 HOWTO (ALPHA_R_REFLONG, /* type */ 133 0, /* rightshift */ 134 4, /* size */ 135 32, /* bitsize */ 136 false, /* pc_relative */ 137 0, /* bitpos */ 138 complain_overflow_bitfield, /* complain_on_overflow */ 139 0, /* special_function */ 140 "REFLONG", /* name */ 141 true, /* partial_inplace */ 142 0xffffffff, /* src_mask */ 143 0xffffffff, /* dst_mask */ 144 false), /* pcrel_offset */ 145 146 /* A 64 bit reference to a symbol. */ 147 HOWTO (ALPHA_R_REFQUAD, /* type */ 148 0, /* rightshift */ 149 8, /* size */ 150 64, /* bitsize */ 151 false, /* pc_relative */ 152 0, /* bitpos */ 153 complain_overflow_bitfield, /* complain_on_overflow */ 154 0, /* special_function */ 155 "REFQUAD", /* name */ 156 true, /* partial_inplace */ 157 MINUS_ONE, /* src_mask */ 158 MINUS_ONE, /* dst_mask */ 159 false), /* pcrel_offset */ 160 161 /* A 32 bit GP relative offset. This is just like REFLONG except 162 that when the value is used the value of the gp register will be 163 added in. */ 164 HOWTO (ALPHA_R_GPREL32, /* type */ 165 0, /* rightshift */ 166 4, /* size */ 167 32, /* bitsize */ 168 false, /* pc_relative */ 169 0, /* bitpos */ 170 complain_overflow_bitfield, /* complain_on_overflow */ 171 0, /* special_function */ 172 "GPREL32", /* name */ 173 true, /* partial_inplace */ 174 0xffffffff, /* src_mask */ 175 0xffffffff, /* dst_mask */ 176 false), /* pcrel_offset */ 177 178 /* Used for an instruction that refers to memory off the GP 179 register. The offset is 16 bits of the 32 bit instruction. This 180 reloc always seems to be against the .lita section. */ 181 HOWTO (ALPHA_R_LITERAL, /* type */ 182 0, /* rightshift */ 183 4, /* size */ 184 16, /* bitsize */ 185 false, /* pc_relative */ 186 0, /* bitpos */ 187 complain_overflow_signed, /* complain_on_overflow */ 188 0, /* special_function */ 189 "LITERAL", /* name */ 190 true, /* partial_inplace */ 191 0xffff, /* src_mask */ 192 0xffff, /* dst_mask */ 193 false), /* pcrel_offset */ 194 195 /* This reloc only appears immediately following a LITERAL reloc. 196 It identifies a use of the literal. It seems that the linker can 197 use this to eliminate a portion of the .lita section. The symbol 198 index is special: 1 means the literal address is in the base 199 register of a memory format instruction; 2 means the literal 200 address is in the byte offset register of a byte-manipulation 201 instruction; 3 means the literal address is in the target 202 register of a jsr instruction. This does not actually do any 203 relocation. */ 204 HOWTO (ALPHA_R_LITUSE, /* type */ 205 0, /* rightshift */ 206 4, /* size */ 207 32, /* bitsize */ 208 false, /* pc_relative */ 209 0, /* bitpos */ 210 complain_overflow_dont, /* complain_on_overflow */ 211 reloc_nil, /* special_function */ 212 "LITUSE", /* name */ 213 false, /* partial_inplace */ 214 0, /* src_mask */ 215 0, /* dst_mask */ 216 false), /* pcrel_offset */ 217 218 /* Load the gp register. This is always used for a ldah instruction 219 which loads the upper 16 bits of the gp register. The next reloc 220 will be an IGNORE reloc which identifies the location of the lda 221 instruction which loads the lower 16 bits. The symbol index of 222 the GPDISP instruction appears to actually be the number of bytes 223 between the ldah and lda instructions. This gives two different 224 ways to determine where the lda instruction is; I don't know why 225 both are used. The value to use for the relocation is the 226 difference between the GP value and the current location; the 227 load will always be done against a register holding the current 228 address. */ 229 HOWTO (ALPHA_R_GPDISP, /* type */ 230 16, /* rightshift */ 231 4, /* size */ 232 16, /* bitsize */ 233 true, /* pc_relative */ 234 0, /* bitpos */ 235 complain_overflow_dont, /* complain_on_overflow */ 236 reloc_nil, /* special_function */ 237 "GPDISP", /* name */ 238 true, /* partial_inplace */ 239 0xffff, /* src_mask */ 240 0xffff, /* dst_mask */ 241 true), /* pcrel_offset */ 242 243 /* A 21 bit branch. The native assembler generates these for 244 branches within the text segment, and also fills in the PC 245 relative offset in the instruction. */ 246 HOWTO (ALPHA_R_BRADDR, /* type */ 247 2, /* rightshift */ 248 4, /* size */ 249 21, /* bitsize */ 250 true, /* pc_relative */ 251 0, /* bitpos */ 252 complain_overflow_signed, /* complain_on_overflow */ 253 0, /* special_function */ 254 "BRADDR", /* name */ 255 true, /* partial_inplace */ 256 0x1fffff, /* src_mask */ 257 0x1fffff, /* dst_mask */ 258 false), /* pcrel_offset */ 259 260 /* A hint for a jump to a register. */ 261 HOWTO (ALPHA_R_HINT, /* type */ 262 2, /* rightshift */ 263 4, /* size */ 264 14, /* bitsize */ 265 true, /* pc_relative */ 266 0, /* bitpos */ 267 complain_overflow_dont, /* complain_on_overflow */ 268 0, /* special_function */ 269 "HINT", /* name */ 270 true, /* partial_inplace */ 271 0x3fff, /* src_mask */ 272 0x3fff, /* dst_mask */ 273 false), /* pcrel_offset */ 274 275 /* 16 bit PC relative offset. */ 276 HOWTO (ALPHA_R_SREL16, /* type */ 277 0, /* rightshift */ 278 2, /* size */ 279 16, /* bitsize */ 280 true, /* pc_relative */ 281 0, /* bitpos */ 282 complain_overflow_signed, /* complain_on_overflow */ 283 0, /* special_function */ 284 "SREL16", /* name */ 285 true, /* partial_inplace */ 286 0xffff, /* src_mask */ 287 0xffff, /* dst_mask */ 288 false), /* pcrel_offset */ 289 290 /* 32 bit PC relative offset. */ 291 HOWTO (ALPHA_R_SREL32, /* type */ 292 0, /* rightshift */ 293 4, /* size */ 294 32, /* bitsize */ 295 true, /* pc_relative */ 296 0, /* bitpos */ 297 complain_overflow_signed, /* complain_on_overflow */ 298 0, /* special_function */ 299 "SREL32", /* name */ 300 true, /* partial_inplace */ 301 0xffffffff, /* src_mask */ 302 0xffffffff, /* dst_mask */ 303 false), /* pcrel_offset */ 304 305 /* A 64 bit PC relative offset. */ 306 HOWTO (ALPHA_R_SREL64, /* type */ 307 0, /* rightshift */ 308 8, /* size */ 309 64, /* bitsize */ 310 true, /* pc_relative */ 311 0, /* bitpos */ 312 complain_overflow_signed, /* complain_on_overflow */ 313 0, /* special_function */ 314 "SREL64", /* name */ 315 true, /* partial_inplace */ 316 MINUS_ONE, /* src_mask */ 317 MINUS_ONE, /* dst_mask */ 318 false), /* pcrel_offset */ 319 320 /* Push a value on the reloc evaluation stack. */ 321 HOWTO (ALPHA_R_OP_PUSH, /* type */ 322 0, /* rightshift */ 323 0, /* size */ 324 0, /* bitsize */ 325 false, /* pc_relative */ 326 0, /* bitpos */ 327 complain_overflow_dont, /* complain_on_overflow */ 328 0, /* special_function */ 329 "OP_PUSH", /* name */ 330 false, /* partial_inplace */ 331 0, /* src_mask */ 332 0, /* dst_mask */ 333 false), /* pcrel_offset */ 334 335 /* Store the value from the stack at the given address. Store it in 336 a bitfield of size r_size starting at bit position r_offset. */ 337 HOWTO (ALPHA_R_OP_STORE, /* type */ 338 0, /* rightshift */ 339 8, /* size */ 340 64, /* bitsize */ 341 false, /* pc_relative */ 342 0, /* bitpos */ 343 complain_overflow_dont, /* complain_on_overflow */ 344 0, /* special_function */ 345 "OP_STORE", /* name */ 346 false, /* partial_inplace */ 347 0, /* src_mask */ 348 MINUS_ONE, /* dst_mask */ 349 false), /* pcrel_offset */ 350 351 /* Subtract the reloc address from the value on the top of the 352 relocation stack. */ 353 HOWTO (ALPHA_R_OP_PSUB, /* type */ 354 0, /* rightshift */ 355 0, /* size */ 356 0, /* bitsize */ 357 false, /* pc_relative */ 358 0, /* bitpos */ 359 complain_overflow_dont, /* complain_on_overflow */ 360 0, /* special_function */ 361 "OP_PSUB", /* name */ 362 false, /* partial_inplace */ 363 0, /* src_mask */ 364 0, /* dst_mask */ 365 false), /* pcrel_offset */ 366 367 /* Shift the value on the top of the relocation stack right by the 368 given value. */ 369 HOWTO (ALPHA_R_OP_PRSHIFT, /* type */ 370 0, /* rightshift */ 371 0, /* size */ 372 0, /* bitsize */ 373 false, /* pc_relative */ 374 0, /* bitpos */ 375 complain_overflow_dont, /* complain_on_overflow */ 376 0, /* special_function */ 377 "OP_PRSHIFT", /* name */ 378 false, /* partial_inplace */ 379 0, /* src_mask */ 380 0, /* dst_mask */ 381 false), /* pcrel_offset */ 382 383 /* Adjust the GP value for a new range in the object file. */ 384 HOWTO (ALPHA_R_GPVALUE, /* type */ 385 0, /* rightshift */ 386 0, /* size */ 387 0, /* bitsize */ 388 false, /* pc_relative */ 389 0, /* bitpos */ 390 complain_overflow_dont, /* complain_on_overflow */ 391 0, /* special_function */ 392 "GPVALUE", /* name */ 393 false, /* partial_inplace */ 394 0, /* src_mask */ 395 0, /* dst_mask */ 396 false) /* pcrel_offset */ 397}; 398 399/* Recognize an Alpha ECOFF file. */ 400 401static bfd_cleanup 402alpha_ecoff_object_p (bfd *abfd) 403{ 404 bfd_cleanup ret; 405 406 ret = coff_object_p (abfd); 407 408 if (ret != NULL) 409 { 410 asection *sec; 411 412 /* Alpha ECOFF has a .pdata section. The lnnoptr field of the 413 .pdata section is the number of entries it contains. Each 414 entry takes up 8 bytes. The number of entries is required 415 since the section is aligned to a 16 byte boundary. When we 416 link .pdata sections together, we do not want to include the 417 alignment bytes. We handle this on input by faking the size 418 of the .pdata section to remove the unwanted alignment bytes. 419 On output we will set the lnnoptr field and force the 420 alignment. */ 421 sec = bfd_get_section_by_name (abfd, _PDATA); 422 if (sec != (asection *) NULL) 423 { 424 bfd_size_type size; 425 426 size = (bfd_size_type) sec->line_filepos * 8; 427 BFD_ASSERT (size == sec->size 428 || size + 8 == sec->size); 429 if (!bfd_set_section_size (sec, size)) 430 return NULL; 431 } 432 } 433 434 return ret; 435} 436 437/* See whether the magic number matches. */ 438 439static bool 440alpha_ecoff_bad_format_hook (bfd *abfd ATTRIBUTE_UNUSED, 441 void * filehdr) 442{ 443 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr; 444 445 if (! ALPHA_ECOFF_BADMAG (*internal_f)) 446 return true; 447 448 if (ALPHA_ECOFF_COMPRESSEDMAG (*internal_f)) 449 _bfd_error_handler 450 (_("%pB: cannot handle compressed Alpha binaries; " 451 "use compiler flags, or objZ, to generate uncompressed binaries"), 452 abfd); 453 454 return false; 455} 456 457/* This is a hook called by coff_real_object_p to create any backend 458 specific information. */ 459 460static void * 461alpha_ecoff_mkobject_hook (bfd *abfd, void * filehdr, void * aouthdr) 462{ 463 void * ecoff; 464 465 ecoff = _bfd_ecoff_mkobject_hook (abfd, filehdr, aouthdr); 466 467 if (ecoff != NULL) 468 { 469 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr; 470 471 /* Set additional BFD flags according to the object type from the 472 machine specific file header flags. */ 473 switch (internal_f->f_flags & F_ALPHA_OBJECT_TYPE_MASK) 474 { 475 case F_ALPHA_SHARABLE: 476 abfd->flags |= DYNAMIC; 477 break; 478 case F_ALPHA_CALL_SHARED: 479 /* Always executable if using shared libraries as the run time 480 loader might resolve undefined references. */ 481 abfd->flags |= (DYNAMIC | EXEC_P); 482 break; 483 } 484 } 485 return ecoff; 486} 487 488/* Reloc handling. */ 489 490/* Swap a reloc in. */ 491 492static void 493alpha_ecoff_swap_reloc_in (bfd *abfd, 494 void * ext_ptr, 495 struct internal_reloc *intern) 496{ 497 const RELOC *ext = (RELOC *) ext_ptr; 498 499 intern->r_vaddr = H_GET_64 (abfd, ext->r_vaddr); 500 intern->r_symndx = H_GET_32 (abfd, ext->r_symndx); 501 502 BFD_ASSERT (bfd_header_little_endian (abfd)); 503 504 intern->r_type = ((ext->r_bits[0] & RELOC_BITS0_TYPE_LITTLE) 505 >> RELOC_BITS0_TYPE_SH_LITTLE); 506 intern->r_extern = (ext->r_bits[1] & RELOC_BITS1_EXTERN_LITTLE) != 0; 507 intern->r_offset = ((ext->r_bits[1] & RELOC_BITS1_OFFSET_LITTLE) 508 >> RELOC_BITS1_OFFSET_SH_LITTLE); 509 /* Ignored the reserved bits. */ 510 intern->r_size = ((ext->r_bits[3] & RELOC_BITS3_SIZE_LITTLE) 511 >> RELOC_BITS3_SIZE_SH_LITTLE); 512 513 if (intern->r_type == ALPHA_R_LITUSE 514 || intern->r_type == ALPHA_R_GPDISP) 515 { 516 /* Handle the LITUSE and GPDISP relocs specially. Its symndx 517 value is not actually a symbol index, but is instead a 518 special code. We put the code in the r_size field, and 519 clobber the symndx. */ 520 if (intern->r_size != 0) 521 abort (); 522 intern->r_size = intern->r_symndx; 523 intern->r_symndx = RELOC_SECTION_NONE; 524 } 525 else if (intern->r_type == ALPHA_R_IGNORE) 526 { 527 /* The IGNORE reloc generally follows a GPDISP reloc, and is 528 against the .lita section. The section is irrelevant. */ 529 if (! intern->r_extern && 530 intern->r_symndx == RELOC_SECTION_ABS) 531 abort (); 532 if (! intern->r_extern && intern->r_symndx == RELOC_SECTION_LITA) 533 intern->r_symndx = RELOC_SECTION_ABS; 534 } 535} 536 537/* Swap a reloc out. */ 538 539static void 540alpha_ecoff_swap_reloc_out (bfd *abfd, 541 const struct internal_reloc *intern, 542 void * dst) 543{ 544 RELOC *ext = (RELOC *) dst; 545 long symndx; 546 unsigned char size; 547 548 /* Undo the hackery done in swap_reloc_in. */ 549 if (intern->r_type == ALPHA_R_LITUSE 550 || intern->r_type == ALPHA_R_GPDISP) 551 { 552 symndx = intern->r_size; 553 size = 0; 554 } 555 else if (intern->r_type == ALPHA_R_IGNORE 556 && ! intern->r_extern 557 && intern->r_symndx == RELOC_SECTION_ABS) 558 { 559 symndx = RELOC_SECTION_LITA; 560 size = intern->r_size; 561 } 562 else 563 { 564 symndx = intern->r_symndx; 565 size = intern->r_size; 566 } 567 568 /* XXX FIXME: The maximum symndx value used to be 14 but this 569 fails with object files produced by DEC's C++ compiler. 570 Where does the value 14 (or 15) come from anyway ? */ 571 BFD_ASSERT (intern->r_extern 572 || (intern->r_symndx >= 0 && intern->r_symndx <= 15)); 573 574 H_PUT_64 (abfd, intern->r_vaddr, ext->r_vaddr); 575 H_PUT_32 (abfd, symndx, ext->r_symndx); 576 577 BFD_ASSERT (bfd_header_little_endian (abfd)); 578 579 ext->r_bits[0] = ((intern->r_type << RELOC_BITS0_TYPE_SH_LITTLE) 580 & RELOC_BITS0_TYPE_LITTLE); 581 ext->r_bits[1] = ((intern->r_extern ? RELOC_BITS1_EXTERN_LITTLE : 0) 582 | ((intern->r_offset << RELOC_BITS1_OFFSET_SH_LITTLE) 583 & RELOC_BITS1_OFFSET_LITTLE)); 584 ext->r_bits[2] = 0; 585 ext->r_bits[3] = ((size << RELOC_BITS3_SIZE_SH_LITTLE) 586 & RELOC_BITS3_SIZE_LITTLE); 587} 588 589/* Finish canonicalizing a reloc. Part of this is generic to all 590 ECOFF targets, and that part is in ecoff.c. The rest is done in 591 this backend routine. It must fill in the howto field. */ 592 593static void 594alpha_adjust_reloc_in (bfd *abfd, 595 const struct internal_reloc *intern, 596 arelent *rptr) 597{ 598 if (intern->r_type > ALPHA_R_GPVALUE) 599 { 600 /* xgettext:c-format */ 601 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 602 abfd, intern->r_type); 603 bfd_set_error (bfd_error_bad_value); 604 rptr->addend = 0; 605 rptr->howto = NULL; 606 return; 607 } 608 609 switch (intern->r_type) 610 { 611 case ALPHA_R_BRADDR: 612 case ALPHA_R_SREL16: 613 case ALPHA_R_SREL32: 614 case ALPHA_R_SREL64: 615 /* This relocs appear to be fully resolved when they are against 616 internal symbols. Against external symbols, BRADDR at least 617 appears to be resolved against the next instruction. */ 618 if (! intern->r_extern) 619 rptr->addend = 0; 620 else 621 rptr->addend = - (intern->r_vaddr + 4); 622 break; 623 624 case ALPHA_R_GPREL32: 625 case ALPHA_R_LITERAL: 626 /* Copy the gp value for this object file into the addend, to 627 ensure that we are not confused by the linker. */ 628 if (! intern->r_extern) 629 rptr->addend += ecoff_data (abfd)->gp; 630 break; 631 632 case ALPHA_R_LITUSE: 633 case ALPHA_R_GPDISP: 634 /* The LITUSE and GPDISP relocs do not use a symbol, or an 635 addend, but they do use a special code. Put this code in the 636 addend field. */ 637 rptr->addend = intern->r_size; 638 break; 639 640 case ALPHA_R_OP_STORE: 641 /* The STORE reloc needs the size and offset fields. We store 642 them in the addend. */ 643 BFD_ASSERT (intern->r_offset <= 256); 644 rptr->addend = (intern->r_offset << 8) + intern->r_size; 645 break; 646 647 case ALPHA_R_OP_PUSH: 648 case ALPHA_R_OP_PSUB: 649 case ALPHA_R_OP_PRSHIFT: 650 /* The PUSH, PSUB and PRSHIFT relocs do not actually use an 651 address. I believe that the address supplied is really an 652 addend. */ 653 rptr->addend = intern->r_vaddr; 654 break; 655 656 case ALPHA_R_GPVALUE: 657 /* Set the addend field to the new GP value. */ 658 rptr->addend = intern->r_symndx + ecoff_data (abfd)->gp; 659 break; 660 661 case ALPHA_R_IGNORE: 662 /* If the type is ALPHA_R_IGNORE, make sure this is a reference 663 to the absolute section so that the reloc is ignored. For 664 some reason the address of this reloc type is not adjusted by 665 the section vma. We record the gp value for this object file 666 here, for convenience when doing the GPDISP relocation. */ 667 rptr->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; 668 rptr->address = intern->r_vaddr; 669 rptr->addend = ecoff_data (abfd)->gp; 670 break; 671 672 default: 673 break; 674 } 675 676 rptr->howto = &alpha_howto_table[intern->r_type]; 677} 678 679/* When writing out a reloc we need to pull some values back out of 680 the addend field into the reloc. This is roughly the reverse of 681 alpha_adjust_reloc_in, except that there are several changes we do 682 not need to undo. */ 683 684static void 685alpha_adjust_reloc_out (bfd *abfd ATTRIBUTE_UNUSED, 686 const arelent *rel, 687 struct internal_reloc *intern) 688{ 689 switch (intern->r_type) 690 { 691 case ALPHA_R_LITUSE: 692 case ALPHA_R_GPDISP: 693 intern->r_size = rel->addend; 694 break; 695 696 case ALPHA_R_OP_STORE: 697 intern->r_size = rel->addend & 0xff; 698 intern->r_offset = (rel->addend >> 8) & 0xff; 699 break; 700 701 case ALPHA_R_OP_PUSH: 702 case ALPHA_R_OP_PSUB: 703 case ALPHA_R_OP_PRSHIFT: 704 intern->r_vaddr = rel->addend; 705 break; 706 707 case ALPHA_R_IGNORE: 708 intern->r_vaddr = rel->address; 709 break; 710 711 default: 712 break; 713 } 714} 715 716/* The size of the stack for the relocation evaluator. */ 717#define RELOC_STACKSIZE (10) 718 719/* Alpha ECOFF relocs have a built in expression evaluator as well as 720 other interdependencies. Rather than use a bunch of special 721 functions and global variables, we use a single routine to do all 722 the relocation for a section. I haven't yet worked out how the 723 assembler is going to handle this. */ 724 725static bfd_byte * 726alpha_ecoff_get_relocated_section_contents (bfd *abfd, 727 struct bfd_link_info *link_info, 728 struct bfd_link_order *link_order, 729 bfd_byte *data, 730 bool relocatable, 731 asymbol **symbols) 732{ 733 bfd *input_bfd = link_order->u.indirect.section->owner; 734 asection *input_section = link_order->u.indirect.section; 735 long reloc_size; 736 arelent **reloc_vector; 737 long reloc_count; 738 bfd *output_bfd = relocatable ? abfd : (bfd *) NULL; 739 bfd_vma gp; 740 bool gp_undefined; 741 bfd_vma stack[RELOC_STACKSIZE]; 742 int tos = 0; 743 744 reloc_size = bfd_get_reloc_upper_bound (input_bfd, input_section); 745 if (reloc_size < 0) 746 return NULL; 747 748 bfd_byte *orig_data = data; 749 if (!bfd_get_full_section_contents (input_bfd, input_section, &data)) 750 return NULL; 751 752 if (data == NULL) 753 return NULL; 754 755 if (reloc_size == 0) 756 return data; 757 758 reloc_vector = (arelent **) bfd_malloc (reloc_size); 759 if (reloc_vector == NULL) 760 goto error_return; 761 762 reloc_count = bfd_canonicalize_reloc (input_bfd, input_section, 763 reloc_vector, symbols); 764 if (reloc_count < 0) 765 goto error_return; 766 if (reloc_count == 0) 767 goto successful_return; 768 769 /* Get the GP value for the output BFD. */ 770 gp_undefined = false; 771 gp = _bfd_get_gp_value (abfd); 772 if (gp == 0) 773 { 774 if (relocatable) 775 { 776 asection *sec; 777 bfd_vma lo; 778 779 /* Make up a value. */ 780 lo = (bfd_vma) -1; 781 for (sec = abfd->sections; sec != NULL; sec = sec->next) 782 { 783 if (sec->vma < lo 784 && (strcmp (sec->name, ".sbss") == 0 785 || strcmp (sec->name, ".sdata") == 0 786 || strcmp (sec->name, ".lit4") == 0 787 || strcmp (sec->name, ".lit8") == 0 788 || strcmp (sec->name, ".lita") == 0)) 789 lo = sec->vma; 790 } 791 gp = lo + 0x8000; 792 _bfd_set_gp_value (abfd, gp); 793 } 794 else 795 { 796 struct bfd_link_hash_entry *h; 797 798 h = bfd_link_hash_lookup (link_info->hash, "_gp", false, false, 799 true); 800 if (h == (struct bfd_link_hash_entry *) NULL 801 || h->type != bfd_link_hash_defined) 802 gp_undefined = true; 803 else 804 { 805 gp = (h->u.def.value 806 + h->u.def.section->output_section->vma 807 + h->u.def.section->output_offset); 808 _bfd_set_gp_value (abfd, gp); 809 } 810 } 811 } 812 813 for (; *reloc_vector != (arelent *) NULL; reloc_vector++) 814 { 815 arelent *rel; 816 bfd_reloc_status_type r; 817 char *err; 818 819 rel = *reloc_vector; 820 r = bfd_reloc_ok; 821 switch (rel->howto->type) 822 { 823 case ALPHA_R_IGNORE: 824 rel->address += input_section->output_offset; 825 break; 826 827 case ALPHA_R_REFLONG: 828 case ALPHA_R_REFQUAD: 829 case ALPHA_R_BRADDR: 830 case ALPHA_R_HINT: 831 case ALPHA_R_SREL16: 832 case ALPHA_R_SREL32: 833 case ALPHA_R_SREL64: 834 if (relocatable 835 && ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0) 836 { 837 rel->address += input_section->output_offset; 838 break; 839 } 840 r = bfd_perform_relocation (input_bfd, rel, data, input_section, 841 output_bfd, &err); 842 break; 843 844 case ALPHA_R_GPREL32: 845 /* This relocation is used in a switch table. It is a 32 846 bit offset from the current GP value. We must adjust it 847 by the different between the original GP value and the 848 current GP value. The original GP value is stored in the 849 addend. We adjust the addend and let 850 bfd_perform_relocation finish the job. */ 851 rel->addend -= gp; 852 r = bfd_perform_relocation (input_bfd, rel, data, input_section, 853 output_bfd, &err); 854 if (r == bfd_reloc_ok && gp_undefined) 855 { 856 r = bfd_reloc_dangerous; 857 err = (char *) _("GP relative relocation used when GP not defined"); 858 } 859 break; 860 861 case ALPHA_R_LITERAL: 862 /* This is a reference to a literal value, generally 863 (always?) in the .lita section. This is a 16 bit GP 864 relative relocation. Sometimes the subsequent reloc is a 865 LITUSE reloc, which indicates how this reloc is used. 866 This sometimes permits rewriting the two instructions 867 referred to by the LITERAL and the LITUSE into different 868 instructions which do not refer to .lita. This can save 869 a memory reference, and permits removing a value from 870 .lita thus saving GP relative space. 871 872 We do not these optimizations. To do them we would need 873 to arrange to link the .lita section first, so that by 874 the time we got here we would know the final values to 875 use. This would not be particularly difficult, but it is 876 not currently implemented. */ 877 878 { 879 unsigned long insn; 880 881 /* I believe that the LITERAL reloc will only apply to a 882 ldq or ldl instruction, so check my assumption. */ 883 insn = bfd_get_32 (input_bfd, data + rel->address); 884 BFD_ASSERT (((insn >> 26) & 0x3f) == 0x29 885 || ((insn >> 26) & 0x3f) == 0x28); 886 887 rel->addend -= gp; 888 r = bfd_perform_relocation (input_bfd, rel, data, input_section, 889 output_bfd, &err); 890 if (r == bfd_reloc_ok && gp_undefined) 891 { 892 r = bfd_reloc_dangerous; 893 err = 894 (char *) _("GP relative relocation used when GP not defined"); 895 } 896 } 897 break; 898 899 case ALPHA_R_LITUSE: 900 /* See ALPHA_R_LITERAL above for the uses of this reloc. It 901 does not cause anything to happen, itself. */ 902 rel->address += input_section->output_offset; 903 break; 904 905 case ALPHA_R_GPDISP: 906 /* This marks the ldah of an ldah/lda pair which loads the 907 gp register with the difference of the gp value and the 908 current location. The second of the pair is r_size bytes 909 ahead; it used to be marked with an ALPHA_R_IGNORE reloc, 910 but that no longer happens in OSF/1 3.2. */ 911 { 912 unsigned long insn1, insn2; 913 bfd_vma addend; 914 915 /* Get the two instructions. */ 916 insn1 = bfd_get_32 (input_bfd, data + rel->address); 917 insn2 = bfd_get_32 (input_bfd, data + rel->address + rel->addend); 918 919 BFD_ASSERT (((insn1 >> 26) & 0x3f) == 0x09); /* ldah */ 920 BFD_ASSERT (((insn2 >> 26) & 0x3f) == 0x08); /* lda */ 921 922 /* Get the existing addend. We must account for the sign 923 extension done by lda and ldah. */ 924 addend = ((insn1 & 0xffff) << 16) + (insn2 & 0xffff); 925 if (insn1 & 0x8000) 926 { 927 addend -= 0x80000000; 928 addend -= 0x80000000; 929 } 930 if (insn2 & 0x8000) 931 addend -= 0x10000; 932 933 /* The existing addend includes the different between the 934 gp of the input BFD and the address in the input BFD. 935 Subtract this out. */ 936 addend -= (ecoff_data (input_bfd)->gp 937 - (input_section->vma + rel->address)); 938 939 /* Now add in the final gp value, and subtract out the 940 final address. */ 941 addend += (gp 942 - (input_section->output_section->vma 943 + input_section->output_offset 944 + rel->address)); 945 946 /* Change the instructions, accounting for the sign 947 extension, and write them out. */ 948 if (addend & 0x8000) 949 addend += 0x10000; 950 insn1 = (insn1 & 0xffff0000) | ((addend >> 16) & 0xffff); 951 insn2 = (insn2 & 0xffff0000) | (addend & 0xffff); 952 953 bfd_put_32 (input_bfd, (bfd_vma) insn1, data + rel->address); 954 bfd_put_32 (input_bfd, (bfd_vma) insn2, 955 data + rel->address + rel->addend); 956 957 rel->address += input_section->output_offset; 958 } 959 break; 960 961 case ALPHA_R_OP_PUSH: 962 /* Push a value on the reloc evaluation stack. */ 963 { 964 asymbol *symbol; 965 bfd_vma relocation; 966 967 if (relocatable) 968 { 969 rel->address += input_section->output_offset; 970 break; 971 } 972 973 /* Figure out the relocation of this symbol. */ 974 symbol = *rel->sym_ptr_ptr; 975 976 if (bfd_is_und_section (symbol->section)) 977 r = bfd_reloc_undefined; 978 979 if (bfd_is_com_section (symbol->section)) 980 relocation = 0; 981 else 982 relocation = symbol->value; 983 relocation += symbol->section->output_section->vma; 984 relocation += symbol->section->output_offset; 985 relocation += rel->addend; 986 987 if (tos >= RELOC_STACKSIZE) 988 abort (); 989 990 stack[tos++] = relocation; 991 } 992 break; 993 994 case ALPHA_R_OP_STORE: 995 /* Store a value from the reloc stack into a bitfield. */ 996 { 997 bfd_vma val; 998 int offset, size; 999 1000 if (relocatable) 1001 { 1002 rel->address += input_section->output_offset; 1003 break; 1004 } 1005 1006 if (tos == 0) 1007 abort (); 1008 1009 /* The offset and size for this reloc are encoded into the 1010 addend field by alpha_adjust_reloc_in. */ 1011 offset = (rel->addend >> 8) & 0xff; 1012 size = rel->addend & 0xff; 1013 1014 val = bfd_get_64 (abfd, data + rel->address); 1015 val &=~ (((1 << size) - 1) << offset); 1016 val |= (stack[--tos] & ((1 << size) - 1)) << offset; 1017 bfd_put_64 (abfd, val, data + rel->address); 1018 } 1019 break; 1020 1021 case ALPHA_R_OP_PSUB: 1022 /* Subtract a value from the top of the stack. */ 1023 { 1024 asymbol *symbol; 1025 bfd_vma relocation; 1026 1027 if (relocatable) 1028 { 1029 rel->address += input_section->output_offset; 1030 break; 1031 } 1032 1033 /* Figure out the relocation of this symbol. */ 1034 symbol = *rel->sym_ptr_ptr; 1035 1036 if (bfd_is_und_section (symbol->section)) 1037 r = bfd_reloc_undefined; 1038 1039 if (bfd_is_com_section (symbol->section)) 1040 relocation = 0; 1041 else 1042 relocation = symbol->value; 1043 relocation += symbol->section->output_section->vma; 1044 relocation += symbol->section->output_offset; 1045 relocation += rel->addend; 1046 1047 if (tos == 0) 1048 abort (); 1049 1050 stack[tos - 1] -= relocation; 1051 } 1052 break; 1053 1054 case ALPHA_R_OP_PRSHIFT: 1055 /* Shift the value on the top of the stack. */ 1056 { 1057 asymbol *symbol; 1058 bfd_vma relocation; 1059 1060 if (relocatable) 1061 { 1062 rel->address += input_section->output_offset; 1063 break; 1064 } 1065 1066 /* Figure out the relocation of this symbol. */ 1067 symbol = *rel->sym_ptr_ptr; 1068 1069 if (bfd_is_und_section (symbol->section)) 1070 r = bfd_reloc_undefined; 1071 1072 if (bfd_is_com_section (symbol->section)) 1073 relocation = 0; 1074 else 1075 relocation = symbol->value; 1076 relocation += symbol->section->output_section->vma; 1077 relocation += symbol->section->output_offset; 1078 relocation += rel->addend; 1079 1080 if (tos == 0) 1081 abort (); 1082 1083 stack[tos - 1] >>= relocation; 1084 } 1085 break; 1086 1087 case ALPHA_R_GPVALUE: 1088 /* I really don't know if this does the right thing. */ 1089 gp = rel->addend; 1090 gp_undefined = false; 1091 break; 1092 1093 default: 1094 abort (); 1095 } 1096 1097 if (relocatable) 1098 { 1099 asection *os = input_section->output_section; 1100 1101 /* A partial link, so keep the relocs. */ 1102 os->orelocation[os->reloc_count] = rel; 1103 os->reloc_count++; 1104 } 1105 1106 if (r != bfd_reloc_ok) 1107 { 1108 switch (r) 1109 { 1110 case bfd_reloc_undefined: 1111 (*link_info->callbacks->undefined_symbol) 1112 (link_info, bfd_asymbol_name (*rel->sym_ptr_ptr), 1113 input_bfd, input_section, rel->address, true); 1114 break; 1115 case bfd_reloc_dangerous: 1116 (*link_info->callbacks->reloc_dangerous) 1117 (link_info, err, input_bfd, input_section, rel->address); 1118 break; 1119 case bfd_reloc_overflow: 1120 (*link_info->callbacks->reloc_overflow) 1121 (link_info, NULL, bfd_asymbol_name (*rel->sym_ptr_ptr), 1122 rel->howto->name, rel->addend, input_bfd, 1123 input_section, rel->address); 1124 break; 1125 case bfd_reloc_outofrange: 1126 default: 1127 abort (); 1128 break; 1129 } 1130 } 1131 } 1132 1133 if (tos != 0) 1134 abort (); 1135 1136 successful_return: 1137 free (reloc_vector); 1138 return data; 1139 1140 error_return: 1141 free (reloc_vector); 1142 if (orig_data == NULL) 1143 free (data); 1144 return NULL; 1145} 1146 1147/* Get the howto structure for a generic reloc type. */ 1148 1149static reloc_howto_type * 1150alpha_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1151 bfd_reloc_code_real_type code) 1152{ 1153 int alpha_type; 1154 1155 switch (code) 1156 { 1157 case BFD_RELOC_32: 1158 alpha_type = ALPHA_R_REFLONG; 1159 break; 1160 case BFD_RELOC_64: 1161 case BFD_RELOC_CTOR: 1162 alpha_type = ALPHA_R_REFQUAD; 1163 break; 1164 case BFD_RELOC_GPREL32: 1165 alpha_type = ALPHA_R_GPREL32; 1166 break; 1167 case BFD_RELOC_ALPHA_LITERAL: 1168 alpha_type = ALPHA_R_LITERAL; 1169 break; 1170 case BFD_RELOC_ALPHA_LITUSE: 1171 alpha_type = ALPHA_R_LITUSE; 1172 break; 1173 case BFD_RELOC_ALPHA_GPDISP_HI16: 1174 alpha_type = ALPHA_R_GPDISP; 1175 break; 1176 case BFD_RELOC_ALPHA_GPDISP_LO16: 1177 alpha_type = ALPHA_R_IGNORE; 1178 break; 1179 case BFD_RELOC_23_PCREL_S2: 1180 alpha_type = ALPHA_R_BRADDR; 1181 break; 1182 case BFD_RELOC_ALPHA_HINT: 1183 alpha_type = ALPHA_R_HINT; 1184 break; 1185 case BFD_RELOC_16_PCREL: 1186 alpha_type = ALPHA_R_SREL16; 1187 break; 1188 case BFD_RELOC_32_PCREL: 1189 alpha_type = ALPHA_R_SREL32; 1190 break; 1191 case BFD_RELOC_64_PCREL: 1192 alpha_type = ALPHA_R_SREL64; 1193 break; 1194 default: 1195 return (reloc_howto_type *) NULL; 1196 } 1197 1198 return &alpha_howto_table[alpha_type]; 1199} 1200 1201static reloc_howto_type * 1202alpha_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1203 const char *r_name) 1204{ 1205 unsigned int i; 1206 1207 for (i = 0; 1208 i < sizeof (alpha_howto_table) / sizeof (alpha_howto_table[0]); 1209 i++) 1210 if (alpha_howto_table[i].name != NULL 1211 && strcasecmp (alpha_howto_table[i].name, r_name) == 0) 1212 return &alpha_howto_table[i]; 1213 1214 return NULL; 1215} 1216 1217/* A helper routine for alpha_relocate_section which converts an 1218 external reloc when generating relocatable output. Returns the 1219 relocation amount. */ 1220 1221static bfd_vma 1222alpha_convert_external_reloc (bfd *output_bfd ATTRIBUTE_UNUSED, 1223 struct bfd_link_info *info, 1224 bfd *input_bfd, 1225 struct external_reloc *ext_rel, 1226 struct ecoff_link_hash_entry *h) 1227{ 1228 unsigned long r_symndx; 1229 bfd_vma relocation; 1230 1231 BFD_ASSERT (bfd_link_relocatable (info)); 1232 1233 if (h->root.type == bfd_link_hash_defined 1234 || h->root.type == bfd_link_hash_defweak) 1235 { 1236 asection *hsec; 1237 const char *name; 1238 1239 /* This symbol is defined in the output. Convert the reloc from 1240 being against the symbol to being against the section. */ 1241 1242 /* Clear the r_extern bit. */ 1243 ext_rel->r_bits[1] &=~ RELOC_BITS1_EXTERN_LITTLE; 1244 1245 /* Compute a new r_symndx value. */ 1246 hsec = h->root.u.def.section; 1247 name = bfd_section_name (hsec->output_section); 1248 1249 r_symndx = (unsigned long) -1; 1250 switch (name[1]) 1251 { 1252 case 'A': 1253 if (strcmp (name, "*ABS*") == 0) 1254 r_symndx = RELOC_SECTION_ABS; 1255 break; 1256 case 'b': 1257 if (strcmp (name, ".bss") == 0) 1258 r_symndx = RELOC_SECTION_BSS; 1259 break; 1260 case 'd': 1261 if (strcmp (name, ".data") == 0) 1262 r_symndx = RELOC_SECTION_DATA; 1263 break; 1264 case 'f': 1265 if (strcmp (name, ".fini") == 0) 1266 r_symndx = RELOC_SECTION_FINI; 1267 break; 1268 case 'i': 1269 if (strcmp (name, ".init") == 0) 1270 r_symndx = RELOC_SECTION_INIT; 1271 break; 1272 case 'l': 1273 if (strcmp (name, ".lita") == 0) 1274 r_symndx = RELOC_SECTION_LITA; 1275 else if (strcmp (name, ".lit8") == 0) 1276 r_symndx = RELOC_SECTION_LIT8; 1277 else if (strcmp (name, ".lit4") == 0) 1278 r_symndx = RELOC_SECTION_LIT4; 1279 break; 1280 case 'p': 1281 if (strcmp (name, ".pdata") == 0) 1282 r_symndx = RELOC_SECTION_PDATA; 1283 break; 1284 case 'r': 1285 if (strcmp (name, ".rdata") == 0) 1286 r_symndx = RELOC_SECTION_RDATA; 1287 else if (strcmp (name, ".rconst") == 0) 1288 r_symndx = RELOC_SECTION_RCONST; 1289 break; 1290 case 's': 1291 if (strcmp (name, ".sdata") == 0) 1292 r_symndx = RELOC_SECTION_SDATA; 1293 else if (strcmp (name, ".sbss") == 0) 1294 r_symndx = RELOC_SECTION_SBSS; 1295 break; 1296 case 't': 1297 if (strcmp (name, ".text") == 0) 1298 r_symndx = RELOC_SECTION_TEXT; 1299 break; 1300 case 'x': 1301 if (strcmp (name, ".xdata") == 0) 1302 r_symndx = RELOC_SECTION_XDATA; 1303 break; 1304 } 1305 1306 if (r_symndx == (unsigned long) -1) 1307 abort (); 1308 1309 /* Add the section VMA and the symbol value. */ 1310 relocation = (h->root.u.def.value 1311 + hsec->output_section->vma 1312 + hsec->output_offset); 1313 } 1314 else 1315 { 1316 /* Change the symndx value to the right one for 1317 the output BFD. */ 1318 r_symndx = h->indx; 1319 if (r_symndx == (unsigned long) -1) 1320 { 1321 /* Caller must give an error. */ 1322 r_symndx = 0; 1323 } 1324 relocation = 0; 1325 } 1326 1327 /* Write out the new r_symndx value. */ 1328 H_PUT_32 (input_bfd, r_symndx, ext_rel->r_symndx); 1329 1330 return relocation; 1331} 1332 1333/* Relocate a section while linking an Alpha ECOFF file. This is 1334 quite similar to get_relocated_section_contents. Perhaps they 1335 could be combined somehow. */ 1336 1337static bool 1338alpha_relocate_section (bfd *output_bfd, 1339 struct bfd_link_info *info, 1340 bfd *input_bfd, 1341 asection *input_section, 1342 bfd_byte *contents, 1343 void * external_relocs) 1344{ 1345 asection **symndx_to_section, *lita_sec; 1346 struct ecoff_link_hash_entry **sym_hashes; 1347 bfd_vma gp; 1348 bool gp_undefined; 1349 bfd_vma stack[RELOC_STACKSIZE]; 1350 int tos = 0; 1351 struct external_reloc *ext_rel; 1352 struct external_reloc *ext_rel_end; 1353 bfd_size_type amt; 1354 1355 /* We keep a table mapping the symndx found in an internal reloc to 1356 the appropriate section. This is faster than looking up the 1357 section by name each time. */ 1358 symndx_to_section = ecoff_data (input_bfd)->symndx_to_section; 1359 if (symndx_to_section == (asection **) NULL) 1360 { 1361 amt = NUM_RELOC_SECTIONS * sizeof (asection *); 1362 symndx_to_section = (asection **) bfd_alloc (input_bfd, amt); 1363 if (!symndx_to_section) 1364 return false; 1365 1366 symndx_to_section[RELOC_SECTION_NONE] = NULL; 1367 symndx_to_section[RELOC_SECTION_TEXT] = 1368 bfd_get_section_by_name (input_bfd, ".text"); 1369 symndx_to_section[RELOC_SECTION_RDATA] = 1370 bfd_get_section_by_name (input_bfd, ".rdata"); 1371 symndx_to_section[RELOC_SECTION_DATA] = 1372 bfd_get_section_by_name (input_bfd, ".data"); 1373 symndx_to_section[RELOC_SECTION_SDATA] = 1374 bfd_get_section_by_name (input_bfd, ".sdata"); 1375 symndx_to_section[RELOC_SECTION_SBSS] = 1376 bfd_get_section_by_name (input_bfd, ".sbss"); 1377 symndx_to_section[RELOC_SECTION_BSS] = 1378 bfd_get_section_by_name (input_bfd, ".bss"); 1379 symndx_to_section[RELOC_SECTION_INIT] = 1380 bfd_get_section_by_name (input_bfd, ".init"); 1381 symndx_to_section[RELOC_SECTION_LIT8] = 1382 bfd_get_section_by_name (input_bfd, ".lit8"); 1383 symndx_to_section[RELOC_SECTION_LIT4] = 1384 bfd_get_section_by_name (input_bfd, ".lit4"); 1385 symndx_to_section[RELOC_SECTION_XDATA] = 1386 bfd_get_section_by_name (input_bfd, ".xdata"); 1387 symndx_to_section[RELOC_SECTION_PDATA] = 1388 bfd_get_section_by_name (input_bfd, ".pdata"); 1389 symndx_to_section[RELOC_SECTION_FINI] = 1390 bfd_get_section_by_name (input_bfd, ".fini"); 1391 symndx_to_section[RELOC_SECTION_LITA] = 1392 bfd_get_section_by_name (input_bfd, ".lita"); 1393 symndx_to_section[RELOC_SECTION_ABS] = bfd_abs_section_ptr; 1394 symndx_to_section[RELOC_SECTION_RCONST] = 1395 bfd_get_section_by_name (input_bfd, ".rconst"); 1396 1397 ecoff_data (input_bfd)->symndx_to_section = symndx_to_section; 1398 } 1399 1400 sym_hashes = ecoff_data (input_bfd)->sym_hashes; 1401 1402 /* On the Alpha, the .lita section must be addressable by the global 1403 pointer. To support large programs, we need to allow multiple 1404 global pointers. This works as long as each input .lita section 1405 is <64KB big. This implies that when producing relocatable 1406 output, the .lita section is limited to 64KB. . */ 1407 1408 lita_sec = symndx_to_section[RELOC_SECTION_LITA]; 1409 gp = _bfd_get_gp_value (output_bfd); 1410 if (! bfd_link_relocatable (info) && lita_sec != NULL) 1411 { 1412 struct ecoff_section_tdata *lita_sec_data; 1413 1414 /* Make sure we have a section data structure to which we can 1415 hang on to the gp value we pick for the section. */ 1416 lita_sec_data = ecoff_section_data (input_bfd, lita_sec); 1417 if (lita_sec_data == NULL) 1418 { 1419 amt = sizeof (struct ecoff_section_tdata); 1420 lita_sec_data = ((struct ecoff_section_tdata *) 1421 bfd_zalloc (input_bfd, amt)); 1422 lita_sec->used_by_bfd = lita_sec_data; 1423 } 1424 1425 if (lita_sec_data->gp != 0) 1426 { 1427 /* If we already assigned a gp to this section, we better 1428 stick with that value. */ 1429 gp = lita_sec_data->gp; 1430 } 1431 else 1432 { 1433 bfd_vma lita_vma; 1434 bfd_size_type lita_size; 1435 1436 lita_vma = lita_sec->output_offset + lita_sec->output_section->vma; 1437 lita_size = lita_sec->size; 1438 1439 if (gp == 0 1440 || lita_vma < gp - 0x8000 1441 || lita_vma + lita_size >= gp + 0x8000) 1442 { 1443 /* Either gp hasn't been set at all or the current gp 1444 cannot address this .lita section. In both cases we 1445 reset the gp to point into the "middle" of the 1446 current input .lita section. */ 1447 if (gp && !ecoff_data (output_bfd)->issued_multiple_gp_warning) 1448 { 1449 (*info->callbacks->warning) (info, 1450 _("using multiple gp values"), 1451 (char *) NULL, output_bfd, 1452 (asection *) NULL, (bfd_vma) 0); 1453 ecoff_data (output_bfd)->issued_multiple_gp_warning = true; 1454 } 1455 if (lita_vma < gp - 0x8000) 1456 gp = lita_vma + lita_size - 0x8000; 1457 else 1458 gp = lita_vma + 0x8000; 1459 1460 } 1461 1462 lita_sec_data->gp = gp; 1463 } 1464 1465 _bfd_set_gp_value (output_bfd, gp); 1466 } 1467 1468 gp_undefined = (gp == 0); 1469 1470 BFD_ASSERT (bfd_header_little_endian (output_bfd)); 1471 BFD_ASSERT (bfd_header_little_endian (input_bfd)); 1472 1473 ext_rel = (struct external_reloc *) external_relocs; 1474 ext_rel_end = ext_rel + input_section->reloc_count; 1475 for (; ext_rel < ext_rel_end; ext_rel++) 1476 { 1477 bfd_vma r_vaddr; 1478 unsigned long r_symndx; 1479 int r_type; 1480 int r_extern; 1481 int r_offset; 1482 int r_size; 1483 bool relocatep; 1484 bool adjust_addrp; 1485 bool gp_usedp; 1486 bfd_vma addend; 1487 1488 r_vaddr = H_GET_64 (input_bfd, ext_rel->r_vaddr); 1489 r_symndx = H_GET_32 (input_bfd, ext_rel->r_symndx); 1490 1491 r_type = ((ext_rel->r_bits[0] & RELOC_BITS0_TYPE_LITTLE) 1492 >> RELOC_BITS0_TYPE_SH_LITTLE); 1493 r_extern = (ext_rel->r_bits[1] & RELOC_BITS1_EXTERN_LITTLE) != 0; 1494 r_offset = ((ext_rel->r_bits[1] & RELOC_BITS1_OFFSET_LITTLE) 1495 >> RELOC_BITS1_OFFSET_SH_LITTLE); 1496 /* Ignored the reserved bits. */ 1497 r_size = ((ext_rel->r_bits[3] & RELOC_BITS3_SIZE_LITTLE) 1498 >> RELOC_BITS3_SIZE_SH_LITTLE); 1499 1500 relocatep = false; 1501 adjust_addrp = true; 1502 gp_usedp = false; 1503 addend = 0; 1504 1505 switch (r_type) 1506 { 1507 case ALPHA_R_GPRELHIGH: 1508 _bfd_error_handler (_("%pB: %s unsupported"), 1509 input_bfd, "ALPHA_R_GPRELHIGH"); 1510 bfd_set_error (bfd_error_bad_value); 1511 continue; 1512 1513 case ALPHA_R_GPRELLOW: 1514 _bfd_error_handler (_("%pB: %s unsupported"), 1515 input_bfd, "ALPHA_R_GPRELLOW"); 1516 bfd_set_error (bfd_error_bad_value); 1517 continue; 1518 1519 default: 1520 /* xgettext:c-format */ 1521 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 1522 input_bfd, (int) r_type); 1523 bfd_set_error (bfd_error_bad_value); 1524 continue; 1525 1526 case ALPHA_R_IGNORE: 1527 /* This reloc appears after a GPDISP reloc. On earlier 1528 versions of OSF/1, It marked the position of the second 1529 instruction to be altered by the GPDISP reloc, but it is 1530 not otherwise used for anything. For some reason, the 1531 address of the relocation does not appear to include the 1532 section VMA, unlike the other relocation types. */ 1533 if (bfd_link_relocatable (info)) 1534 H_PUT_64 (input_bfd, input_section->output_offset + r_vaddr, 1535 ext_rel->r_vaddr); 1536 adjust_addrp = false; 1537 break; 1538 1539 case ALPHA_R_REFLONG: 1540 case ALPHA_R_REFQUAD: 1541 case ALPHA_R_HINT: 1542 relocatep = true; 1543 break; 1544 1545 case ALPHA_R_BRADDR: 1546 case ALPHA_R_SREL16: 1547 case ALPHA_R_SREL32: 1548 case ALPHA_R_SREL64: 1549 if (r_extern) 1550 addend += - (r_vaddr + 4); 1551 relocatep = true; 1552 break; 1553 1554 case ALPHA_R_GPREL32: 1555 /* This relocation is used in a switch table. It is a 32 1556 bit offset from the current GP value. We must adjust it 1557 by the different between the original GP value and the 1558 current GP value. */ 1559 relocatep = true; 1560 addend = ecoff_data (input_bfd)->gp - gp; 1561 gp_usedp = true; 1562 break; 1563 1564 case ALPHA_R_LITERAL: 1565 /* This is a reference to a literal value, generally 1566 (always?) in the .lita section. This is a 16 bit GP 1567 relative relocation. Sometimes the subsequent reloc is a 1568 LITUSE reloc, which indicates how this reloc is used. 1569 This sometimes permits rewriting the two instructions 1570 referred to by the LITERAL and the LITUSE into different 1571 instructions which do not refer to .lita. This can save 1572 a memory reference, and permits removing a value from 1573 .lita thus saving GP relative space. 1574 1575 We do not these optimizations. To do them we would need 1576 to arrange to link the .lita section first, so that by 1577 the time we got here we would know the final values to 1578 use. This would not be particularly difficult, but it is 1579 not currently implemented. */ 1580 1581 /* I believe that the LITERAL reloc will only apply to a ldq 1582 or ldl instruction, so check my assumption. */ 1583 { 1584 unsigned long insn; 1585 1586 insn = bfd_get_32 (input_bfd, 1587 contents + r_vaddr - input_section->vma); 1588 BFD_ASSERT (((insn >> 26) & 0x3f) == 0x29 1589 || ((insn >> 26) & 0x3f) == 0x28); 1590 } 1591 1592 relocatep = true; 1593 addend = ecoff_data (input_bfd)->gp - gp; 1594 gp_usedp = true; 1595 break; 1596 1597 case ALPHA_R_LITUSE: 1598 /* See ALPHA_R_LITERAL above for the uses of this reloc. It 1599 does not cause anything to happen, itself. */ 1600 break; 1601 1602 case ALPHA_R_GPDISP: 1603 /* This marks the ldah of an ldah/lda pair which loads the 1604 gp register with the difference of the gp value and the 1605 current location. The second of the pair is r_symndx 1606 bytes ahead. It used to be marked with an ALPHA_R_IGNORE 1607 reloc, but OSF/1 3.2 no longer does that. */ 1608 { 1609 unsigned long insn1, insn2; 1610 1611 /* Get the two instructions. */ 1612 insn1 = bfd_get_32 (input_bfd, 1613 contents + r_vaddr - input_section->vma); 1614 insn2 = bfd_get_32 (input_bfd, 1615 (contents 1616 + r_vaddr 1617 - input_section->vma 1618 + r_symndx)); 1619 1620 BFD_ASSERT (((insn1 >> 26) & 0x3f) == 0x09); /* ldah */ 1621 BFD_ASSERT (((insn2 >> 26) & 0x3f) == 0x08); /* lda */ 1622 1623 /* Get the existing addend. We must account for the sign 1624 extension done by lda and ldah. */ 1625 addend = ((insn1 & 0xffff) << 16) + (insn2 & 0xffff); 1626 if (insn1 & 0x8000) 1627 { 1628 /* This is addend -= 0x100000000 without causing an 1629 integer overflow on a 32 bit host. */ 1630 addend -= 0x80000000; 1631 addend -= 0x80000000; 1632 } 1633 if (insn2 & 0x8000) 1634 addend -= 0x10000; 1635 1636 /* The existing addend includes the difference between the 1637 gp of the input BFD and the address in the input BFD. 1638 We want to change this to the difference between the 1639 final GP and the final address. */ 1640 addend += (gp 1641 - ecoff_data (input_bfd)->gp 1642 + input_section->vma 1643 - (input_section->output_section->vma 1644 + input_section->output_offset)); 1645 1646 /* Change the instructions, accounting for the sign 1647 extension, and write them out. */ 1648 if (addend & 0x8000) 1649 addend += 0x10000; 1650 insn1 = (insn1 & 0xffff0000) | ((addend >> 16) & 0xffff); 1651 insn2 = (insn2 & 0xffff0000) | (addend & 0xffff); 1652 1653 bfd_put_32 (input_bfd, (bfd_vma) insn1, 1654 contents + r_vaddr - input_section->vma); 1655 bfd_put_32 (input_bfd, (bfd_vma) insn2, 1656 contents + r_vaddr - input_section->vma + r_symndx); 1657 1658 gp_usedp = true; 1659 } 1660 break; 1661 1662 case ALPHA_R_OP_PUSH: 1663 case ALPHA_R_OP_PSUB: 1664 case ALPHA_R_OP_PRSHIFT: 1665 /* Manipulate values on the reloc evaluation stack. The 1666 r_vaddr field is not an address in input_section, it is 1667 the current value (including any addend) of the object 1668 being used. */ 1669 if (! r_extern) 1670 { 1671 asection *s; 1672 1673 s = symndx_to_section[r_symndx]; 1674 if (s == (asection *) NULL) 1675 abort (); 1676 addend = s->output_section->vma + s->output_offset - s->vma; 1677 } 1678 else 1679 { 1680 struct ecoff_link_hash_entry *h; 1681 1682 h = sym_hashes[r_symndx]; 1683 if (h == (struct ecoff_link_hash_entry *) NULL) 1684 abort (); 1685 1686 if (! bfd_link_relocatable (info)) 1687 { 1688 if (h->root.type == bfd_link_hash_defined 1689 || h->root.type == bfd_link_hash_defweak) 1690 addend = (h->root.u.def.value 1691 + h->root.u.def.section->output_section->vma 1692 + h->root.u.def.section->output_offset); 1693 else 1694 { 1695 /* Note that we pass the address as 0, since we 1696 do not have a meaningful number for the 1697 location within the section that is being 1698 relocated. */ 1699 (*info->callbacks->undefined_symbol) 1700 (info, h->root.root.string, input_bfd, 1701 input_section, (bfd_vma) 0, true); 1702 addend = 0; 1703 } 1704 } 1705 else 1706 { 1707 if (h->root.type != bfd_link_hash_defined 1708 && h->root.type != bfd_link_hash_defweak 1709 && h->indx == -1) 1710 { 1711 /* This symbol is not being written out. Pass 1712 the address as 0, as with undefined_symbol, 1713 above. */ 1714 (*info->callbacks->unattached_reloc) 1715 (info, h->root.root.string, 1716 input_bfd, input_section, (bfd_vma) 0); 1717 } 1718 1719 addend = alpha_convert_external_reloc (output_bfd, info, 1720 input_bfd, 1721 ext_rel, h); 1722 } 1723 } 1724 1725 addend += r_vaddr; 1726 1727 if (bfd_link_relocatable (info)) 1728 { 1729 /* Adjust r_vaddr by the addend. */ 1730 H_PUT_64 (input_bfd, addend, ext_rel->r_vaddr); 1731 } 1732 else 1733 { 1734 switch (r_type) 1735 { 1736 case ALPHA_R_OP_PUSH: 1737 if (tos >= RELOC_STACKSIZE) 1738 abort (); 1739 stack[tos++] = addend; 1740 break; 1741 1742 case ALPHA_R_OP_PSUB: 1743 if (tos == 0) 1744 abort (); 1745 stack[tos - 1] -= addend; 1746 break; 1747 1748 case ALPHA_R_OP_PRSHIFT: 1749 if (tos == 0) 1750 abort (); 1751 stack[tos - 1] >>= addend; 1752 break; 1753 } 1754 } 1755 1756 adjust_addrp = false; 1757 break; 1758 1759 case ALPHA_R_OP_STORE: 1760 /* Store a value from the reloc stack into a bitfield. If 1761 we are generating relocatable output, all we do is 1762 adjust the address of the reloc. */ 1763 if (! bfd_link_relocatable (info)) 1764 { 1765 bfd_vma mask; 1766 bfd_vma val; 1767 1768 if (tos == 0) 1769 abort (); 1770 1771 /* Get the relocation mask. The separate steps and the 1772 casts to bfd_vma are attempts to avoid a bug in the 1773 Alpha OSF 1.3 C compiler. See reloc.c for more 1774 details. */ 1775 mask = 1; 1776 mask <<= (bfd_vma) r_size; 1777 mask -= 1; 1778 1779 /* FIXME: I don't know what kind of overflow checking, 1780 if any, should be done here. */ 1781 val = bfd_get_64 (input_bfd, 1782 contents + r_vaddr - input_section->vma); 1783 val &=~ mask << (bfd_vma) r_offset; 1784 val |= (stack[--tos] & mask) << (bfd_vma) r_offset; 1785 bfd_put_64 (input_bfd, val, 1786 contents + r_vaddr - input_section->vma); 1787 } 1788 break; 1789 1790 case ALPHA_R_GPVALUE: 1791 /* I really don't know if this does the right thing. */ 1792 gp = ecoff_data (input_bfd)->gp + r_symndx; 1793 gp_undefined = false; 1794 break; 1795 } 1796 1797 if (relocatep) 1798 { 1799 reloc_howto_type *howto; 1800 struct ecoff_link_hash_entry *h = NULL; 1801 asection *s = NULL; 1802 bfd_vma relocation; 1803 bfd_reloc_status_type r; 1804 1805 /* Perform a relocation. */ 1806 1807 howto = &alpha_howto_table[r_type]; 1808 1809 if (r_extern) 1810 { 1811 h = sym_hashes[r_symndx]; 1812 /* If h is NULL, that means that there is a reloc 1813 against an external symbol which we thought was just 1814 a debugging symbol. This should not happen. */ 1815 if (h == (struct ecoff_link_hash_entry *) NULL) 1816 abort (); 1817 } 1818 else 1819 { 1820 if (r_symndx >= NUM_RELOC_SECTIONS) 1821 s = NULL; 1822 else 1823 s = symndx_to_section[r_symndx]; 1824 1825 if (s == (asection *) NULL) 1826 abort (); 1827 } 1828 1829 if (bfd_link_relocatable (info)) 1830 { 1831 /* We are generating relocatable output, and must 1832 convert the existing reloc. */ 1833 if (r_extern) 1834 { 1835 if (h->root.type != bfd_link_hash_defined 1836 && h->root.type != bfd_link_hash_defweak 1837 && h->indx == -1) 1838 { 1839 /* This symbol is not being written out. */ 1840 (*info->callbacks->unattached_reloc) 1841 (info, h->root.root.string, input_bfd, 1842 input_section, r_vaddr - input_section->vma); 1843 } 1844 1845 relocation = alpha_convert_external_reloc (output_bfd, 1846 info, 1847 input_bfd, 1848 ext_rel, 1849 h); 1850 } 1851 else 1852 { 1853 /* This is a relocation against a section. Adjust 1854 the value by the amount the section moved. */ 1855 relocation = (s->output_section->vma 1856 + s->output_offset 1857 - s->vma); 1858 } 1859 1860 /* If this is PC relative, the existing object file 1861 appears to already have the reloc worked out. We 1862 must subtract out the old value and add in the new 1863 one. */ 1864 if (howto->pc_relative) 1865 relocation -= (input_section->output_section->vma 1866 + input_section->output_offset 1867 - input_section->vma); 1868 1869 /* Put in any addend. */ 1870 relocation += addend; 1871 1872 /* Adjust the contents. */ 1873 r = _bfd_relocate_contents (howto, input_bfd, relocation, 1874 (contents 1875 + r_vaddr 1876 - input_section->vma)); 1877 } 1878 else 1879 { 1880 /* We are producing a final executable. */ 1881 if (r_extern) 1882 { 1883 /* This is a reloc against a symbol. */ 1884 if (h->root.type == bfd_link_hash_defined 1885 || h->root.type == bfd_link_hash_defweak) 1886 { 1887 asection *hsec; 1888 1889 hsec = h->root.u.def.section; 1890 relocation = (h->root.u.def.value 1891 + hsec->output_section->vma 1892 + hsec->output_offset); 1893 } 1894 else 1895 { 1896 (*info->callbacks->undefined_symbol) 1897 (info, h->root.root.string, input_bfd, input_section, 1898 r_vaddr - input_section->vma, true); 1899 relocation = 0; 1900 } 1901 } 1902 else 1903 { 1904 /* This is a reloc against a section. */ 1905 relocation = (s->output_section->vma 1906 + s->output_offset 1907 - s->vma); 1908 1909 /* Adjust a PC relative relocation by removing the 1910 reference to the original source section. */ 1911 if (howto->pc_relative) 1912 relocation += input_section->vma; 1913 } 1914 1915 r = _bfd_final_link_relocate (howto, 1916 input_bfd, 1917 input_section, 1918 contents, 1919 r_vaddr - input_section->vma, 1920 relocation, 1921 addend); 1922 } 1923 1924 if (r != bfd_reloc_ok) 1925 { 1926 switch (r) 1927 { 1928 default: 1929 case bfd_reloc_outofrange: 1930 abort (); 1931 case bfd_reloc_overflow: 1932 { 1933 const char *name; 1934 1935 if (r_extern) 1936 name = sym_hashes[r_symndx]->root.root.string; 1937 else 1938 name = bfd_section_name (symndx_to_section[r_symndx]); 1939 (*info->callbacks->reloc_overflow) 1940 (info, NULL, name, alpha_howto_table[r_type].name, 1941 (bfd_vma) 0, input_bfd, input_section, 1942 r_vaddr - input_section->vma); 1943 } 1944 break; 1945 } 1946 } 1947 } 1948 1949 if (bfd_link_relocatable (info) && adjust_addrp) 1950 { 1951 /* Change the address of the relocation. */ 1952 H_PUT_64 (input_bfd, 1953 (input_section->output_section->vma 1954 + input_section->output_offset 1955 - input_section->vma 1956 + r_vaddr), 1957 ext_rel->r_vaddr); 1958 } 1959 1960 if (gp_usedp && gp_undefined) 1961 { 1962 (*info->callbacks->reloc_dangerous) 1963 (info, _("GP relative relocation used when GP not defined"), 1964 input_bfd, input_section, r_vaddr - input_section->vma); 1965 /* Only give the error once per link. */ 1966 gp = 4; 1967 _bfd_set_gp_value (output_bfd, gp); 1968 gp_undefined = false; 1969 } 1970 } 1971 1972 if (tos != 0) 1973 abort (); 1974 1975 return true; 1976} 1977 1978/* Do final adjustments to the filehdr and the aouthdr. This routine 1979 sets the dynamic bits in the file header. */ 1980 1981static bool 1982alpha_adjust_headers (bfd *abfd, 1983 struct internal_filehdr *fhdr, 1984 struct internal_aouthdr *ahdr ATTRIBUTE_UNUSED) 1985{ 1986 if ((abfd->flags & (DYNAMIC | EXEC_P)) == (DYNAMIC | EXEC_P)) 1987 fhdr->f_flags |= F_ALPHA_CALL_SHARED; 1988 else if ((abfd->flags & DYNAMIC) != 0) 1989 fhdr->f_flags |= F_ALPHA_SHARABLE; 1990 return true; 1991} 1992 1993/* Archive handling. In OSF/1 (or Digital Unix) v3.2, Digital 1994 introduced archive packing, in which the elements in an archive are 1995 optionally compressed using a simple dictionary scheme. We know 1996 how to read such archives, but we don't write them. */ 1997 1998#define alpha_ecoff_slurp_armap _bfd_ecoff_slurp_armap 1999#define alpha_ecoff_slurp_extended_name_table \ 2000 _bfd_ecoff_slurp_extended_name_table 2001#define alpha_ecoff_construct_extended_name_table \ 2002 _bfd_ecoff_construct_extended_name_table 2003#define alpha_ecoff_truncate_arname _bfd_ecoff_truncate_arname 2004#define alpha_ecoff_write_armap _bfd_ecoff_write_armap 2005#define alpha_ecoff_write_ar_hdr _bfd_generic_write_ar_hdr 2006#define alpha_ecoff_generic_stat_arch_elt _bfd_ecoff_generic_stat_arch_elt 2007#define alpha_ecoff_update_armap_timestamp _bfd_ecoff_update_armap_timestamp 2008 2009/* A compressed file uses this instead of ARFMAG. */ 2010 2011#define ARFZMAG "Z\012" 2012 2013/* Read an archive header. This is like the standard routine, but it 2014 also accepts ARFZMAG. */ 2015 2016static void * 2017alpha_ecoff_read_ar_hdr (bfd *abfd) 2018{ 2019 struct areltdata *ret; 2020 struct ar_hdr *h; 2021 2022 ret = (struct areltdata *) _bfd_generic_read_ar_hdr_mag (abfd, ARFZMAG); 2023 if (ret == NULL) 2024 return NULL; 2025 2026 h = (struct ar_hdr *) ret->arch_header; 2027 if (strncmp (h->ar_fmag, ARFZMAG, 2) == 0) 2028 { 2029 bfd_byte ab[8]; 2030 2031 /* This is a compressed file. We must set the size correctly. 2032 The size is the eight bytes after the dummy file header. */ 2033 if (bfd_seek (abfd, (file_ptr) FILHSZ, SEEK_CUR) != 0 2034 || bfd_bread (ab, (bfd_size_type) 8, abfd) != 8 2035 || bfd_seek (abfd, (file_ptr) (- (FILHSZ + 8)), SEEK_CUR) != 0) 2036 { 2037 free (ret); 2038 return NULL; 2039 } 2040 2041 ret->parsed_size = H_GET_64 (abfd, ab); 2042 } 2043 2044 return ret; 2045} 2046 2047/* Get an archive element at a specified file position. This is where 2048 we uncompress the archive element if necessary. */ 2049 2050static bfd * 2051alpha_ecoff_get_elt_at_filepos (bfd *archive, file_ptr filepos, 2052 struct bfd_link_info *info) 2053{ 2054 bfd *nbfd = NULL; 2055 struct areltdata *tdata; 2056 struct ar_hdr *hdr; 2057 bfd_byte ab[8]; 2058 bfd_size_type size; 2059 bfd_byte *buf, *p; 2060 struct bfd_in_memory *bim; 2061 ufile_ptr filesize; 2062 2063 buf = NULL; 2064 nbfd = _bfd_get_elt_at_filepos (archive, filepos, info); 2065 if (nbfd == NULL) 2066 goto error_return; 2067 2068 if ((nbfd->flags & BFD_IN_MEMORY) != 0) 2069 { 2070 /* We have already expanded this BFD. */ 2071 return nbfd; 2072 } 2073 2074 tdata = (struct areltdata *) nbfd->arelt_data; 2075 hdr = (struct ar_hdr *) tdata->arch_header; 2076 if (strncmp (hdr->ar_fmag, ARFZMAG, 2) != 0) 2077 return nbfd; 2078 2079 /* We must uncompress this element. We do this by copying it into a 2080 memory buffer, and making bfd_bread and bfd_seek use that buffer. 2081 This can use a lot of memory, but it's simpler than getting a 2082 temporary file, making that work with the file descriptor caching 2083 code, and making sure that it is deleted at all appropriate 2084 times. It can be changed if it ever becomes important. */ 2085 2086 /* The compressed file starts with a dummy ECOFF file header. */ 2087 if (bfd_seek (nbfd, (file_ptr) FILHSZ, SEEK_SET) != 0) 2088 goto error_return; 2089 2090 /* The next eight bytes are the real file size. */ 2091 if (bfd_bread (ab, (bfd_size_type) 8, nbfd) != 8) 2092 goto error_return; 2093 size = H_GET_64 (nbfd, ab); 2094 2095 /* The decompression algorithm will at most expand by eight times. */ 2096 filesize = bfd_get_file_size (archive); 2097 if (filesize != 0 && size / 8 > filesize) 2098 { 2099 bfd_set_error (bfd_error_malformed_archive); 2100 goto error_return; 2101 } 2102 2103 if (size != 0) 2104 { 2105 bfd_size_type left; 2106 bfd_byte dict[4096]; 2107 unsigned int h; 2108 bfd_byte b; 2109 2110 buf = (bfd_byte *) bfd_malloc (size); 2111 if (buf == NULL) 2112 goto error_return; 2113 p = buf; 2114 2115 left = size; 2116 2117 /* I don't know what the next eight bytes are for. */ 2118 if (bfd_bread (ab, (bfd_size_type) 8, nbfd) != 8) 2119 goto error_return; 2120 2121 /* This is the uncompression algorithm. It's a simple 2122 dictionary based scheme in which each character is predicted 2123 by a hash of the previous three characters. A control byte 2124 indicates whether the character is predicted or whether it 2125 appears in the input stream; each control byte manages the 2126 next eight bytes in the output stream. */ 2127 memset (dict, 0, sizeof dict); 2128 h = 0; 2129 while (bfd_bread (&b, (bfd_size_type) 1, nbfd) == 1) 2130 { 2131 unsigned int i; 2132 2133 for (i = 0; i < 8; i++, b >>= 1) 2134 { 2135 bfd_byte n; 2136 2137 if ((b & 1) == 0) 2138 n = dict[h]; 2139 else 2140 { 2141 if (bfd_bread (&n, 1, nbfd) != 1) 2142 goto error_return; 2143 dict[h] = n; 2144 } 2145 2146 *p++ = n; 2147 2148 --left; 2149 if (left == 0) 2150 break; 2151 2152 h <<= 4; 2153 h ^= n; 2154 h &= sizeof dict - 1; 2155 } 2156 2157 if (left == 0) 2158 break; 2159 } 2160 } 2161 2162 /* Now the uncompressed file contents are in buf. */ 2163 bim = ((struct bfd_in_memory *) 2164 bfd_malloc ((bfd_size_type) sizeof (struct bfd_in_memory))); 2165 if (bim == NULL) 2166 goto error_return; 2167 bim->size = size; 2168 bim->buffer = buf; 2169 2170 nbfd->mtime_set = true; 2171 nbfd->mtime = strtol (hdr->ar_date, (char **) NULL, 10); 2172 2173 nbfd->flags |= BFD_IN_MEMORY; 2174 nbfd->iostream = bim; 2175 nbfd->iovec = &_bfd_memory_iovec; 2176 nbfd->origin = 0; 2177 BFD_ASSERT (! nbfd->cacheable); 2178 2179 return nbfd; 2180 2181 error_return: 2182 free (buf); 2183 if (nbfd != NULL) 2184 bfd_close (nbfd); 2185 return NULL; 2186} 2187 2188/* Open the next archived file. */ 2189 2190static bfd * 2191alpha_ecoff_openr_next_archived_file (bfd *archive, bfd *last_file) 2192{ 2193 ufile_ptr filestart; 2194 2195 if (last_file == NULL) 2196 filestart = bfd_ardata (archive)->first_file_filepos; 2197 else 2198 { 2199 struct areltdata *t; 2200 struct ar_hdr *h; 2201 bfd_size_type size; 2202 2203 /* We can't use arelt_size here, because that uses parsed_size, 2204 which is the uncompressed size. We need the compressed size. */ 2205 t = (struct areltdata *) last_file->arelt_data; 2206 h = (struct ar_hdr *) t->arch_header; 2207 size = strtol (h->ar_size, (char **) NULL, 10); 2208 2209 /* Pad to an even boundary... 2210 Note that last_file->origin can be odd in the case of 2211 BSD-4.4-style element with a long odd size. */ 2212 filestart = last_file->proxy_origin + size; 2213 filestart += filestart % 2; 2214 if (filestart < last_file->proxy_origin) 2215 { 2216 /* Prevent looping. See PR19256. */ 2217 bfd_set_error (bfd_error_malformed_archive); 2218 return NULL; 2219 } 2220 } 2221 2222 return alpha_ecoff_get_elt_at_filepos (archive, filestart, NULL); 2223} 2224 2225/* Open the archive file given an index into the armap. */ 2226 2227static bfd * 2228alpha_ecoff_get_elt_at_index (bfd *abfd, symindex sym_index) 2229{ 2230 carsym *entry; 2231 2232 entry = bfd_ardata (abfd)->symdefs + sym_index; 2233 return alpha_ecoff_get_elt_at_filepos (abfd, entry->file_offset, 2234 NULL); 2235} 2236 2237static void 2238alpha_ecoff_swap_coff_aux_in (bfd *abfd ATTRIBUTE_UNUSED, 2239 void *ext1 ATTRIBUTE_UNUSED, 2240 int type ATTRIBUTE_UNUSED, 2241 int in_class ATTRIBUTE_UNUSED, 2242 int indx ATTRIBUTE_UNUSED, 2243 int numaux ATTRIBUTE_UNUSED, 2244 void *in1 ATTRIBUTE_UNUSED) 2245{ 2246} 2247 2248static void 2249alpha_ecoff_swap_coff_sym_in (bfd *abfd ATTRIBUTE_UNUSED, 2250 void *ext1 ATTRIBUTE_UNUSED, 2251 void *in1 ATTRIBUTE_UNUSED) 2252{ 2253} 2254 2255static void 2256alpha_ecoff_swap_coff_lineno_in (bfd *abfd ATTRIBUTE_UNUSED, 2257 void *ext1 ATTRIBUTE_UNUSED, 2258 void *in1 ATTRIBUTE_UNUSED) 2259{ 2260} 2261 2262static unsigned int 2263alpha_ecoff_swap_coff_aux_out (bfd *abfd ATTRIBUTE_UNUSED, 2264 void *inp ATTRIBUTE_UNUSED, 2265 int type ATTRIBUTE_UNUSED, 2266 int in_class ATTRIBUTE_UNUSED, 2267 int indx ATTRIBUTE_UNUSED, 2268 int numaux ATTRIBUTE_UNUSED, 2269 void *extp ATTRIBUTE_UNUSED) 2270{ 2271 return 0; 2272} 2273 2274static unsigned int 2275alpha_ecoff_swap_coff_sym_out (bfd *abfd ATTRIBUTE_UNUSED, 2276 void *inp ATTRIBUTE_UNUSED, 2277 void *extp ATTRIBUTE_UNUSED) 2278{ 2279 return 0; 2280} 2281 2282static unsigned int 2283alpha_ecoff_swap_coff_lineno_out (bfd *abfd ATTRIBUTE_UNUSED, 2284 void *inp ATTRIBUTE_UNUSED, 2285 void *extp ATTRIBUTE_UNUSED) 2286{ 2287 return 0; 2288} 2289 2290static unsigned int 2291alpha_ecoff_swap_coff_reloc_out (bfd *abfd ATTRIBUTE_UNUSED, 2292 void *inp ATTRIBUTE_UNUSED, 2293 void *extp ATTRIBUTE_UNUSED) 2294{ 2295 return 0; 2296} 2297 2298/* This is the ECOFF backend structure. The backend field of the 2299 target vector points to this. */ 2300 2301static const struct ecoff_backend_data alpha_ecoff_backend_data = 2302{ 2303 /* COFF backend structure. */ 2304 { 2305 alpha_ecoff_swap_coff_aux_in, alpha_ecoff_swap_coff_sym_in, 2306 alpha_ecoff_swap_coff_lineno_in, alpha_ecoff_swap_coff_aux_out, 2307 alpha_ecoff_swap_coff_sym_out, alpha_ecoff_swap_coff_lineno_out, 2308 alpha_ecoff_swap_coff_reloc_out, 2309 alpha_ecoff_swap_filehdr_out, alpha_ecoff_swap_aouthdr_out, 2310 alpha_ecoff_swap_scnhdr_out, 2311 FILHSZ, AOUTSZ, SCNHSZ, 0, 0, 0, 0, FILNMLEN, true, 2312 ECOFF_NO_LONG_SECTION_NAMES, 4, false, 2, 32768, 2313 alpha_ecoff_swap_filehdr_in, alpha_ecoff_swap_aouthdr_in, 2314 alpha_ecoff_swap_scnhdr_in, NULL, 2315 alpha_ecoff_bad_format_hook, _bfd_ecoff_set_arch_mach_hook, 2316 alpha_ecoff_mkobject_hook, _bfd_ecoff_styp_to_sec_flags, 2317 _bfd_ecoff_set_alignment_hook, _bfd_ecoff_slurp_symbol_table, 2318 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 2319 NULL, NULL, NULL, NULL 2320 }, 2321 /* Supported architecture. */ 2322 bfd_arch_alpha, 2323 /* Initial portion of armap string. */ 2324 "________64", 2325 /* The page boundary used to align sections in a demand-paged 2326 executable file. E.g., 0x1000. */ 2327 0x2000, 2328 /* TRUE if the .rdata section is part of the text segment, as on the 2329 Alpha. FALSE if .rdata is part of the data segment, as on the 2330 MIPS. */ 2331 true, 2332 /* Bitsize of constructor entries. */ 2333 64, 2334 /* Reloc to use for constructor entries. */ 2335 &alpha_howto_table[ALPHA_R_REFQUAD], 2336 { 2337 /* Symbol table magic number. */ 2338 magicSym2, 2339 /* Alignment of debugging information. E.g., 4. */ 2340 8, 2341 /* Sizes of external symbolic information. */ 2342 sizeof (struct hdr_ext), 2343 sizeof (struct dnr_ext), 2344 sizeof (struct pdr_ext), 2345 sizeof (struct sym_ext), 2346 sizeof (struct opt_ext), 2347 sizeof (struct fdr_ext), 2348 sizeof (struct rfd_ext), 2349 sizeof (struct ext_ext), 2350 /* Functions to swap in external symbolic data. */ 2351 ecoff_swap_hdr_in, 2352 ecoff_swap_dnr_in, 2353 ecoff_swap_pdr_in, 2354 ecoff_swap_sym_in, 2355 ecoff_swap_opt_in, 2356 ecoff_swap_fdr_in, 2357 ecoff_swap_rfd_in, 2358 ecoff_swap_ext_in, 2359 _bfd_ecoff_swap_tir_in, 2360 _bfd_ecoff_swap_rndx_in, 2361 /* Functions to swap out external symbolic data. */ 2362 ecoff_swap_hdr_out, 2363 ecoff_swap_dnr_out, 2364 ecoff_swap_pdr_out, 2365 ecoff_swap_sym_out, 2366 ecoff_swap_opt_out, 2367 ecoff_swap_fdr_out, 2368 ecoff_swap_rfd_out, 2369 ecoff_swap_ext_out, 2370 _bfd_ecoff_swap_tir_out, 2371 _bfd_ecoff_swap_rndx_out, 2372 /* Function to read in symbolic data. */ 2373 _bfd_ecoff_slurp_symbolic_info 2374 }, 2375 /* External reloc size. */ 2376 RELSZ, 2377 /* Reloc swapping functions. */ 2378 alpha_ecoff_swap_reloc_in, 2379 alpha_ecoff_swap_reloc_out, 2380 /* Backend reloc tweaking. */ 2381 alpha_adjust_reloc_in, 2382 alpha_adjust_reloc_out, 2383 /* Relocate section contents while linking. */ 2384 alpha_relocate_section, 2385 /* Do final adjustments to filehdr and aouthdr. */ 2386 alpha_adjust_headers, 2387 /* Read an element from an archive at a given file position. */ 2388 alpha_ecoff_get_elt_at_filepos 2389}; 2390 2391/* Looking up a reloc type is Alpha specific. */ 2392#define _bfd_ecoff_bfd_reloc_type_lookup alpha_bfd_reloc_type_lookup 2393#define _bfd_ecoff_bfd_reloc_name_lookup \ 2394 alpha_bfd_reloc_name_lookup 2395 2396/* So is getting relocated section contents. */ 2397#define _bfd_ecoff_bfd_get_relocated_section_contents \ 2398 alpha_ecoff_get_relocated_section_contents 2399 2400/* Handling file windows is generic. */ 2401#define _bfd_ecoff_get_section_contents_in_window \ 2402 _bfd_generic_get_section_contents_in_window 2403 2404/* Input section flag lookup is generic. */ 2405#define _bfd_ecoff_bfd_lookup_section_flags bfd_generic_lookup_section_flags 2406 2407/* Relaxing sections is generic. */ 2408#define _bfd_ecoff_bfd_relax_section bfd_generic_relax_section 2409#define _bfd_ecoff_bfd_gc_sections bfd_generic_gc_sections 2410#define _bfd_ecoff_bfd_merge_sections bfd_generic_merge_sections 2411#define _bfd_ecoff_bfd_is_group_section bfd_generic_is_group_section 2412#define _bfd_ecoff_bfd_group_name bfd_generic_group_name 2413#define _bfd_ecoff_bfd_discard_group bfd_generic_discard_group 2414#define _bfd_ecoff_section_already_linked \ 2415 _bfd_coff_section_already_linked 2416#define _bfd_ecoff_bfd_define_common_symbol bfd_generic_define_common_symbol 2417#define _bfd_ecoff_bfd_link_hide_symbol _bfd_generic_link_hide_symbol 2418#define _bfd_ecoff_bfd_define_start_stop bfd_generic_define_start_stop 2419#define _bfd_ecoff_bfd_link_check_relocs _bfd_generic_link_check_relocs 2420 2421/* Installing internal relocations in a section is also generic. */ 2422#define _bfd_ecoff_set_reloc _bfd_generic_set_reloc 2423 2424const bfd_target alpha_ecoff_le_vec = 2425{ 2426 "ecoff-littlealpha", /* name */ 2427 bfd_target_ecoff_flavour, 2428 BFD_ENDIAN_LITTLE, /* data byte order is little */ 2429 BFD_ENDIAN_LITTLE, /* header byte order is little */ 2430 2431 (HAS_RELOC | EXEC_P /* object flags */ 2432 | HAS_LINENO | HAS_DEBUG 2433 | HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED), 2434 2435 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE 2436 | SEC_DATA | SEC_SMALL_DATA), 2437 0, /* leading underscore */ 2438 ' ', /* ar_pad_char */ 2439 15, /* ar_max_namelen */ 2440 0, /* match priority. */ 2441 TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */ 2442 bfd_getl64, bfd_getl_signed_64, bfd_putl64, 2443 bfd_getl32, bfd_getl_signed_32, bfd_putl32, 2444 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ 2445 bfd_getl64, bfd_getl_signed_64, bfd_putl64, 2446 bfd_getl32, bfd_getl_signed_32, bfd_putl32, 2447 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */ 2448 2449 { /* bfd_check_format */ 2450 _bfd_dummy_target, 2451 alpha_ecoff_object_p, 2452 bfd_generic_archive_p, 2453 _bfd_dummy_target 2454 }, 2455 { /* bfd_set_format */ 2456 _bfd_bool_bfd_false_error, 2457 _bfd_ecoff_mkobject, 2458 _bfd_generic_mkarchive, 2459 _bfd_bool_bfd_false_error 2460 }, 2461 { /* bfd_write_contents */ 2462 _bfd_bool_bfd_false_error, 2463 _bfd_ecoff_write_object_contents, 2464 _bfd_write_archive_contents, 2465 _bfd_bool_bfd_false_error 2466 }, 2467 2468 BFD_JUMP_TABLE_GENERIC (_bfd_ecoff), 2469 BFD_JUMP_TABLE_COPY (_bfd_ecoff), 2470 BFD_JUMP_TABLE_CORE (_bfd_nocore), 2471 BFD_JUMP_TABLE_ARCHIVE (alpha_ecoff), 2472 BFD_JUMP_TABLE_SYMBOLS (_bfd_ecoff), 2473 BFD_JUMP_TABLE_RELOCS (_bfd_ecoff), 2474 BFD_JUMP_TABLE_WRITE (_bfd_ecoff), 2475 BFD_JUMP_TABLE_LINK (_bfd_ecoff), 2476 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 2477 2478 NULL, 2479 2480 &alpha_ecoff_backend_data 2481}; 2482