1/* BFD back-end for MIPS PE COFF files. 2 Copyright (C) 1990-2017 Free Software Foundation, Inc. 3 Modified from coff-i386.c by DJ Delorie, dj@cygnus.com 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22#define COFF_WITH_PE 23/* pei-mips.c may have defined this to default off (0) before 24 including this file, so don't redefine if that's the case. 25 Otherwise we're generating objects, not executable images, 26 so we want to define it to default on. */ 27#ifndef COFF_LONG_SECTION_NAMES 28#define COFF_LONG_SECTION_NAMES 29#endif /* COFF_LONG_SECTION_NAMES */ 30#define PCRELOFFSET TRUE 31 32#include "sysdep.h" 33#include "bfd.h" 34#include "libbfd.h" 35#include "coff/mipspe.h" 36#include "coff/internal.h" 37#include "coff/pe.h" 38#include "libcoff.h" 39 40#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2 41/* The page size is a guess based on ELF. */ 42 43#define COFF_PAGE_SIZE 0x1000 44 45/* For some reason when using mips COFF the value stored in the .text 46 section for a reference to a common symbol is the value itself plus 47 any desired offset. Ian Taylor, Cygnus Support. */ 48 49/* If we are producing relocatable output, we need to do some 50 adjustments to the object file that are not done by the 51 bfd_perform_relocation function. This function is called by every 52 reloc type to make any required adjustments. */ 53 54static bfd_reloc_status_type 55coff_mips_reloc (bfd *abfd, 56 arelent *reloc_entry, 57 asymbol *symbol, 58 void * data, 59 asection *input_section ATTRIBUTE_UNUSED, 60 bfd *output_bfd, 61 char **error_message ATTRIBUTE_UNUSED) 62{ 63 symvalue diff; 64 65 if (output_bfd == NULL) 66 return bfd_reloc_continue; 67 68 if (bfd_is_com_section (symbol->section)) 69 { 70#ifndef COFF_WITH_PE 71 /* We are relocating a common symbol. The current value in the 72 object file is ORIG + OFFSET, where ORIG is the value of the 73 common symbol as seen by the object file when it was compiled 74 (this may be zero if the symbol was undefined) and OFFSET is 75 the offset into the common symbol (normally zero, but may be 76 non-zero when referring to a field in a common structure). 77 ORIG is the negative of reloc_entry->addend, which is set by 78 the CALC_ADDEND macro below. We want to replace the value in 79 the object file with NEW + OFFSET, where NEW is the value of 80 the common symbol which we are going to put in the final 81 object file. NEW is symbol->value. */ 82 diff = symbol->value + reloc_entry->addend; 83#else 84 /* In PE mode, we do not offset the common symbol. */ 85 diff = reloc_entry->addend; 86#endif 87 } 88 else 89 /* For some reason bfd_perform_relocation always effectively 90 ignores the addend for a COFF target when producing 91 relocatable output. This seems to be always wrong for 386 92 COFF, so we handle the addend here instead. */ 93 diff = reloc_entry->addend; 94 95#define DOIT(x) \ 96 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + (diff >> howto->rightshift)) & howto->dst_mask)) 97 98 if (diff != 0) 99 { 100 reloc_howto_type *howto = reloc_entry->howto; 101 unsigned char *addr = (unsigned char *) data + reloc_entry->address; 102 103 switch (howto->size) 104 { 105 case 0: 106 { 107 char x = bfd_get_8 (abfd, addr); 108 109 DOIT (x); 110 bfd_put_8 (abfd, x, addr); 111 } 112 break; 113 114 case 1: 115 { 116 short x = bfd_get_16 (abfd, addr); 117 118 DOIT (x); 119 bfd_put_16 (abfd, (bfd_vma) x, addr); 120 } 121 break; 122 123 case 2: 124 { 125 long x = bfd_get_32 (abfd, addr); 126 127 DOIT (x); 128 bfd_put_32 (abfd, (bfd_vma) x, addr); 129 } 130 break; 131 132 default: 133 abort (); 134 } 135 } 136 137 /* Now let bfd_perform_relocation finish everything up. */ 138 return bfd_reloc_continue; 139} 140 141#ifdef COFF_WITH_PE 142/* Return TRUE if this relocation should 143 appear in the output .reloc section. */ 144 145static bfd_boolean 146in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED, reloc_howto_type *howto) 147{ 148 return ! howto->pc_relative && howto->type != MIPS_R_RVA; 149} 150#endif 151 152#ifndef PCRELOFFSET 153#define PCRELOFFSET FALSE 154#endif 155 156static reloc_howto_type howto_table[] = 157{ 158 /* Reloc type 0 is ignored. The reloc reading code ensures that 159 this is a reference to the .abs section, which will cause 160 bfd_perform_relocation to do nothing. */ 161 HOWTO (MIPS_R_ABSOLUTE, /* Type. */ 162 0, /* Rightshift. */ 163 0, /* Size (0 = byte, 1 = short, 2 = long). */ 164 8, /* Bitsize. */ 165 FALSE, /* PC_relative. */ 166 0, /* Bitpos. */ 167 complain_overflow_dont, /* Complain_on_overflow. */ 168 0, /* Special_function. */ 169 "IGNORE", /* Name. */ 170 FALSE, /* Partial_inplace. */ 171 0, /* Src_mask. */ 172 0, /* Dst_mask. */ 173 FALSE), /* Pcrel_offset. */ 174 175 /* A 16 bit reference to a symbol, normally from a data section. */ 176 HOWTO (MIPS_R_REFHALF, /* Type. */ 177 0, /* Rightshift. */ 178 1, /* Size (0 = byte, 1 = short, 2 = long). */ 179 16, /* Bitsize. */ 180 FALSE, /* PC_relative. */ 181 0, /* Bitpos. */ 182 complain_overflow_bitfield, /* Complain_on_overflow. */ 183 coff_mips_reloc, /* Special_function. */ 184 "REFHALF", /* Name. */ 185 TRUE, /* Partial_inplace. */ 186 0xffff, /* Src_mask. */ 187 0xffff, /* Dst_mask. */ 188 FALSE), /* Pcrel_offset. */ 189 190 /* A 32 bit reference to a symbol, normally from a data section. */ 191 HOWTO (MIPS_R_REFWORD, /* Type. */ 192 0, /* Rightshift. */ 193 2, /* Size (0 = byte, 1 = short, 2 = long). */ 194 32, /* Bitsize. */ 195 FALSE, /* PC_relative. */ 196 0, /* Bitpos. */ 197 complain_overflow_bitfield, /* Complain_on_overflow. */ 198 coff_mips_reloc, /* Special_function. */ 199 "REFWORD", /* Name. */ 200 TRUE, /* Partial_inplace. */ 201 0xffffffff, /* Src_mask. */ 202 0xffffffff, /* Dst_mask. */ 203 FALSE), /* Pcrel_offset. */ 204 205 /* A 26 bit absolute jump address. */ 206 HOWTO (MIPS_R_JMPADDR, /* Type. */ 207 2, /* Rightshift. */ 208 2, /* Size (0 = byte, 1 = short, 2 = long). */ 209 26, /* Bitsize. */ 210 FALSE, /* PC_relative. */ 211 0, /* Bitpos. */ 212 complain_overflow_dont, /* Complain_on_overflow. */ 213 /* This needs complex overflow 214 detection, because the upper four 215 bits must match the PC. */ 216 coff_mips_reloc, /* Special_function. */ 217 "JMPADDR", /* Name. */ 218 TRUE, /* Partial_inplace. */ 219 0x3ffffff, /* Src_mask. */ 220 0x3ffffff, /* Dst_mask. */ 221 FALSE), /* Pcrel_offset. */ 222 223 /* The high 16 bits of a symbol value. Handled by the function 224 mips_refhi_reloc. */ 225 HOWTO (MIPS_R_REFHI, /* Type. */ 226 16, /* Rightshift. */ 227 2, /* Size (0 = byte, 1 = short, 2 = long). */ 228 16, /* Bitsize. */ 229 FALSE, /* PC_relative. */ 230 0, /* Bitpos. */ 231 complain_overflow_bitfield, /* Complain_on_overflow. */ 232 coff_mips_reloc, /* Special_function. */ 233 "REFHI", /* Name. */ 234 TRUE, /* Partial_inplace. */ 235 0xffff, /* Src_mask. */ 236 0xffff, /* Dst_mask. */ 237 FALSE), /* Pcrel_offset. */ 238 239 /* The low 16 bits of a symbol value. */ 240 HOWTO (MIPS_R_REFLO, /* Type. */ 241 0, /* Rightshift. */ 242 2, /* Size (0 = byte, 1 = short, 2 = long). */ 243 16, /* Bitsize. */ 244 FALSE, /* PC_relative. */ 245 0, /* Bitpos. */ 246 complain_overflow_dont, /* Complain_on_overflow. */ 247 coff_mips_reloc, /* Special_function. */ 248 "REFLO", /* Name. */ 249 TRUE, /* Partial_inplace. */ 250 0xffff, /* Src_mask. */ 251 0xffff, /* Dst_mask. */ 252 FALSE), /* Pcrel_offset. */ 253 254 /* A reference to an offset from the gp register. Handled by the 255 function mips_gprel_reloc. */ 256 HOWTO (MIPS_R_GPREL, /* Type. */ 257 0, /* Rightshift. */ 258 2, /* Size (0 = byte, 1 = short, 2 = long). */ 259 16, /* Bitsize. */ 260 FALSE, /* PC_relative. */ 261 0, /* Bitpos. */ 262 complain_overflow_signed, /* Complain_on_overflow. */ 263 coff_mips_reloc, /* Special_function. */ 264 "GPREL", /* Name. */ 265 TRUE, /* Partial_inplace. */ 266 0xffff, /* Src_mask. */ 267 0xffff, /* Dst_mask. */ 268 FALSE), /* Pcrel_offset. */ 269 270 /* A reference to a literal using an offset from the gp register. 271 Handled by the function mips_gprel_reloc. */ 272 HOWTO (MIPS_R_LITERAL, /* Type. */ 273 0, /* Rightshift. */ 274 2, /* Size (0 = byte, 1 = short, 2 = long). */ 275 16, /* Bitsize. */ 276 FALSE, /* PC_relative. */ 277 0, /* Bitpos. */ 278 complain_overflow_signed, /* Complain_on_overflow. */ 279 coff_mips_reloc, /* Special_function. */ 280 "LITERAL", /* Name. */ 281 TRUE, /* Partial_inplace. */ 282 0xffff, /* Src_mask. */ 283 0xffff, /* Dst_mask. */ 284 FALSE), /* Pcrel_offset. */ 285 286 EMPTY_HOWTO (8), 287 EMPTY_HOWTO (9), 288 EMPTY_HOWTO (10), 289 EMPTY_HOWTO (11), 290 EMPTY_HOWTO (12), 291 EMPTY_HOWTO (13), 292 EMPTY_HOWTO (14), 293 EMPTY_HOWTO (15), 294 EMPTY_HOWTO (16), 295 EMPTY_HOWTO (17), 296 EMPTY_HOWTO (18), 297 EMPTY_HOWTO (19), 298 EMPTY_HOWTO (20), 299 EMPTY_HOWTO (21), 300 EMPTY_HOWTO (22), 301 EMPTY_HOWTO (23), 302 EMPTY_HOWTO (24), 303 EMPTY_HOWTO (25), 304 EMPTY_HOWTO (26), 305 EMPTY_HOWTO (27), 306 EMPTY_HOWTO (28), 307 EMPTY_HOWTO (29), 308 EMPTY_HOWTO (30), 309 EMPTY_HOWTO (31), 310 EMPTY_HOWTO (32), 311 EMPTY_HOWTO (33), 312 HOWTO (MIPS_R_RVA, /* Type. */ 313 0, /* Rightshift. */ 314 2, /* Size (0 = byte, 1 = short, 2 = long). */ 315 32, /* Bitsize. */ 316 FALSE, /* PC_relative. */ 317 0, /* Bitpos. */ 318 complain_overflow_bitfield, /* Complain_on_overflow. */ 319 coff_mips_reloc, /* Special_function. */ 320 "rva32", /* Name. */ 321 TRUE, /* Partial_inplace. */ 322 0xffffffff, /* Src_mask. */ 323 0xffffffff, /* Dst_mask. */ 324 FALSE), /* Pcrel_offset. */ 325 EMPTY_HOWTO (35), 326 EMPTY_HOWTO (36), 327 HOWTO (MIPS_R_PAIR, /* Type. */ 328 0, /* Rightshift. */ 329 2, /* Size (0 = byte, 1 = short, 2 = long). */ 330 32, /* Bitsize. */ 331 FALSE, /* PC_relative. */ 332 0, /* Bitpos. */ 333 complain_overflow_bitfield, /* Complain_on_overflow. */ 334 coff_mips_reloc, /* Special_function. */ 335 "PAIR", /* Name. */ 336 TRUE, /* Partial_inplace. */ 337 0xffffffff, /* Src_mask. */ 338 0xffffffff, /* Dst_mask. */ 339 FALSE), /* Pcrel_offset. */ 340}; 341 342#define NUM_HOWTOS (sizeof (howto_table) / sizeof (howto_table[0])) 343 344/* Turn a howto into a reloc nunmber. */ 345 346#define SELECT_RELOC(x, howto) { x.r_type = howto->type; } 347#define BADMAG(x) MIPSBADMAG (x) 348 349/* Customize coffcode.h. */ 350#define MIPS 1 351 352#define RTYPE2HOWTO(cache_ptr, dst) \ 353 ((cache_ptr)->howto = \ 354 ((dst)->r_type < NUM_HOWTOS \ 355 ? howto_table + (dst)->r_type \ 356 : NULL)) 357 358/* Compute the addend of a reloc. If the reloc is to a common symbol, 359 the object file contains the value of the common symbol. By the 360 time this is called, the linker may be using a different symbol 361 from a different object file with a different value. Therefore, we 362 hack wildly to locate the original symbol from this file so that we 363 can make the correct adjustment. This macro sets coffsym to the 364 symbol from the original file, and uses it to set the addend value 365 correctly. If this is not a common symbol, the usual addend 366 calculation is done, except that an additional tweak is needed for 367 PC relative relocs. 368 FIXME: This macro refers to symbols and asect; these are from the 369 calling function, not the macro arguments. */ 370 371#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \ 372 { \ 373 coff_symbol_type *coffsym = NULL; \ 374 if (ptr && bfd_asymbol_bfd (ptr) != abfd) \ 375 coffsym = (obj_symbols (abfd) \ 376 + (cache_ptr->sym_ptr_ptr - symbols)); \ 377 else if (ptr) \ 378 coffsym = coff_symbol_from (ptr); \ 379 if (coffsym != NULL \ 380 && coffsym->native->u.syment.n_scnum == 0) \ 381 cache_ptr->addend = - coffsym->native->u.syment.n_value; \ 382 else if (ptr && bfd_asymbol_bfd (ptr) == abfd \ 383 && ptr->section != NULL) \ 384 cache_ptr->addend = - (ptr->section->vma + ptr->value); \ 385 else \ 386 cache_ptr->addend = 0; \ 387 if (ptr && reloc.r_type < NUM_HOWTOS \ 388 && howto_table[reloc.r_type].pc_relative) \ 389 cache_ptr->addend += asect->vma; \ 390 } 391 392/* Convert an rtype to howto for the COFF backend linker. */ 393 394static reloc_howto_type * 395coff_mips_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED, 396 asection *sec, 397 struct internal_reloc *rel, 398 struct coff_link_hash_entry *h, 399 struct internal_syment *sym, 400 bfd_vma *addendp) 401{ 402 403 reloc_howto_type *howto; 404 405 howto = howto_table + rel->r_type; 406 407#ifdef COFF_WITH_PE 408 *addendp = 0; 409#endif 410 411 if (howto->pc_relative) 412 *addendp += sec->vma; 413 414 if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0) 415 { 416 /* This is a common symbol. The section contents include the 417 size (sym->n_value) as an addend. The relocate_section 418 function will be adding in the final value of the symbol. We 419 need to subtract out the current size in order to get the 420 correct result. */ 421 422 BFD_ASSERT (h != NULL); 423 424#ifndef COFF_WITH_PE 425 /* I think we *do* want to bypass this. If we don't, I have 426 seen some data parameters get the wrong relocation address. 427 If I link two versions with and without this section bypassed 428 and then do a binary comparison, the addresses which are 429 different can be looked up in the map. The case in which 430 this section has been bypassed has addresses which correspond 431 to values I can find in the map. */ 432 *addendp -= sym->n_value; 433#endif 434 } 435 436#ifndef COFF_WITH_PE 437 /* If the output symbol is common (in which case this must be a 438 relocatable link), we need to add in the final size of the 439 common symbol. */ 440 if (h != NULL && h->root.type == bfd_link_hash_common) 441 *addendp += h->root.u.c.size; 442#endif 443 444#ifdef COFF_WITH_PE 445 if (howto->pc_relative) 446 { 447 *addendp -= 4; 448 449 /* If the symbol is defined, then the generic code is going to 450 add back the symbol value in order to cancel out an 451 adjustment it made to the addend. However, we set the addend 452 to 0 at the start of this function. We need to adjust here, 453 to avoid the adjustment the generic code will make. FIXME: 454 This is getting a bit hackish. */ 455 if (sym != NULL && sym->n_scnum != 0) 456 *addendp -= sym->n_value; 457 } 458 459 if (rel->r_type == MIPS_R_RVA) 460 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase; 461#endif 462 463 return howto; 464} 465 466#define coff_rtype_to_howto coff_mips_rtype_to_howto 467#define coff_bfd_reloc_type_lookup coff_mips_reloc_type_lookup 468#define coff_bfd_reloc_name_lookup coff_mips_reloc_name_lookup 469 470/* Get the howto structure for a generic reloc type. */ 471 472static reloc_howto_type * 473coff_mips_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 474 bfd_reloc_code_real_type code) 475{ 476 int mips_type; 477 478 switch (code) 479 { 480 case BFD_RELOC_16: 481 mips_type = MIPS_R_REFHALF; 482 break; 483 case BFD_RELOC_32: 484 case BFD_RELOC_CTOR: 485 mips_type = MIPS_R_REFWORD; 486 break; 487 case BFD_RELOC_MIPS_JMP: 488 mips_type = MIPS_R_JMPADDR; 489 break; 490 case BFD_RELOC_HI16_S: 491 mips_type = MIPS_R_REFHI; 492 break; 493 case BFD_RELOC_LO16: 494 mips_type = MIPS_R_REFLO; 495 break; 496 case BFD_RELOC_GPREL16: 497 mips_type = MIPS_R_GPREL; 498 break; 499 case BFD_RELOC_MIPS_LITERAL: 500 mips_type = MIPS_R_LITERAL; 501 break; 502 case BFD_RELOC_RVA: 503 mips_type = MIPS_R_RVA; 504 break; 505 default: 506 return NULL; 507 } 508 509 return & howto_table [mips_type]; 510} 511 512static reloc_howto_type * 513coff_mips_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 514 const char *r_name) 515{ 516 unsigned int i; 517 518 for (i = 0; i < NUM_HOWTOS; i++) 519 if (howto_table[i].name != NULL 520 && strcasecmp (howto_table[i].name, r_name) == 0) 521 return &howto_table[i]; 522 523 return NULL; 524} 525 526static void 527mips_swap_reloc_in (bfd * abfd, void * src, void * dst) 528{ 529 static struct internal_reloc pair_prev; 530 RELOC *reloc_src = (RELOC *) src; 531 struct internal_reloc *reloc_dst = (struct internal_reloc *) dst; 532 533 reloc_dst->r_vaddr = H_GET_32 (abfd, reloc_src->r_vaddr); 534 reloc_dst->r_symndx = H_GET_S32 (abfd, reloc_src->r_symndx); 535 reloc_dst->r_type = H_GET_16 (abfd, reloc_src->r_type); 536 reloc_dst->r_size = 0; 537 reloc_dst->r_extern = 0; 538 reloc_dst->r_offset = 0; 539 540 switch (reloc_dst->r_type) 541 { 542 case MIPS_R_REFHI: 543 pair_prev = *reloc_dst; 544 break; 545 case MIPS_R_PAIR: 546 reloc_dst->r_offset = reloc_dst->r_symndx; 547 if (reloc_dst->r_offset & 0x8000) 548 reloc_dst->r_offset -= 0x10000; 549 reloc_dst->r_symndx = pair_prev.r_symndx; 550 break; 551 } 552} 553 554static unsigned int 555mips_swap_reloc_out (bfd * abfd, void * src, void * dst) 556{ 557 static bfd_vma prev_addr = 0; 558 struct internal_reloc *reloc_src = (struct internal_reloc *)src; 559 struct external_reloc *reloc_dst = (struct external_reloc *)dst; 560 561 switch (reloc_src->r_type) 562 { 563 case MIPS_R_REFHI: 564 prev_addr = reloc_src->r_vaddr; 565 break; 566 case MIPS_R_REFLO: 567 if (reloc_src->r_vaddr == prev_addr) 568 { 569 /* FIXME: only slightly hackish. If we see a REFLO pointing to 570 the same address as a REFHI, we assume this is the matching 571 PAIR reloc and output it accordingly. The symndx is really 572 the low 16 bits of the addend */ 573 H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr); 574 H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx); 575 H_PUT_16 (abfd, MIPS_R_PAIR, reloc_dst->r_type); 576 return RELSZ; 577 } 578 break; 579 } 580 581 H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr); 582 H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx); 583 584 H_PUT_16 (abfd, reloc_src->r_type, reloc_dst->r_type); 585 return RELSZ; 586} 587 588#define coff_swap_reloc_in mips_swap_reloc_in 589#define coff_swap_reloc_out mips_swap_reloc_out 590#define NO_COFF_RELOCS 591 592static bfd_boolean 593coff_pe_mips_relocate_section (bfd *output_bfd, 594 struct bfd_link_info *info, 595 bfd *input_bfd, 596 asection *input_section, 597 bfd_byte *contents, 598 struct internal_reloc *relocs, 599 struct internal_syment *syms, 600 asection **sections) 601{ 602 struct internal_reloc *rel; 603 struct internal_reloc *rel_end; 604 unsigned int i; 605 606 if (bfd_link_relocatable (info)) 607 { 608 _bfd_error_handler 609 (_("%B: `ld -r' not supported with PE MIPS objects\n"), input_bfd); 610 bfd_set_error (bfd_error_bad_value); 611 return FALSE; 612 } 613 614 BFD_ASSERT (input_bfd->xvec->byteorder 615 == output_bfd->xvec->byteorder); 616 617 rel = relocs; 618 rel_end = rel + input_section->reloc_count; 619 620 for (i = 0; rel < rel_end; rel++, i++) 621 { 622 long symndx; 623 struct coff_link_hash_entry *h; 624 struct internal_syment *sym; 625 bfd_vma addend = 0; 626 bfd_vma val, tmp, targ, src, low; 627 reloc_howto_type *howto; 628 unsigned char *mem = contents + rel->r_vaddr; 629 630 symndx = rel->r_symndx; 631 632 if (symndx == -1) 633 { 634 h = NULL; 635 sym = NULL; 636 } 637 else 638 { 639 h = obj_coff_sym_hashes (input_bfd)[symndx]; 640 sym = syms + symndx; 641 } 642 643 /* COFF treats common symbols in one of two ways. Either the 644 size of the symbol is included in the section contents, or it 645 is not. We assume that the size is not included, and force 646 the rtype_to_howto function to adjust the addend as needed. */ 647 648 if (sym != NULL && sym->n_scnum != 0) 649 addend = - sym->n_value; 650 else 651 addend = 0; 652 653 howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h, 654 sym, &addend); 655 if (howto == NULL) 656 return FALSE; 657 658 /* If we are doing a relocatable link, then we can just ignore 659 a PC relative reloc that is pcrel_offset. It will already 660 have the correct value. If this is not a relocatable link, 661 then we should ignore the symbol value. */ 662 if (howto->pc_relative && howto->pcrel_offset) 663 { 664 if (bfd_link_relocatable (info)) 665 continue; 666 if (sym != NULL && sym->n_scnum != 0) 667 addend += sym->n_value; 668 } 669 670 val = 0; 671 672 if (h == NULL) 673 { 674 asection *sec; 675 676 if (symndx == -1) 677 { 678 sec = bfd_abs_section_ptr; 679 val = 0; 680 } 681 else 682 { 683 sec = sections[symndx]; 684 val = (sec->output_section->vma 685 + sec->output_offset 686 + sym->n_value); 687 if (! obj_pe (input_bfd)) 688 val -= sec->vma; 689 } 690 } 691 else 692 { 693 if (h->root.type == bfd_link_hash_defined 694 || h->root.type == bfd_link_hash_defweak) 695 { 696 asection *sec; 697 698 sec = h->root.u.def.section; 699 val = (h->root.u.def.value 700 + sec->output_section->vma 701 + sec->output_offset); 702 } 703 704 else if (! bfd_link_relocatable (info)) 705 (*info->callbacks->undefined_symbol) 706 (info, h->root.root.string, input_bfd, input_section, 707 rel->r_vaddr - input_section->vma, TRUE); 708 } 709 710 src = rel->r_vaddr + input_section->output_section->vma 711 + input_section->output_offset; 712 713 /* OK, at this point the following variables are set up: 714 src = VMA of the memory we're fixing up 715 mem = pointer to memory we're fixing up 716 val = VMA of what we need to refer to. */ 717 718#define UI(x) \ 719 /* xgettext:c-format */ \ 720 _bfd_error_handler (_("%B: unimplemented %s\n"), \ 721 input_bfd, x); \ 722 bfd_set_error (bfd_error_bad_value); 723 724 switch (rel->r_type) 725 { 726 case MIPS_R_ABSOLUTE: 727 /* Ignore these. */ 728 break; 729 730 case MIPS_R_REFHALF: 731 UI ("refhalf"); 732 break; 733 734 case MIPS_R_REFWORD: 735 tmp = bfd_get_32 (input_bfd, mem); 736 /* printf ("refword: src=%08x targ=%08x+%08x\n", src, tmp, val); */ 737 tmp += val; 738 bfd_put_32 (input_bfd, tmp, mem); 739 break; 740 741 case MIPS_R_JMPADDR: 742 tmp = bfd_get_32 (input_bfd, mem); 743 targ = val + (tmp & 0x03ffffff) * 4; 744 if ((src & 0xf0000000) != (targ & 0xf0000000)) 745 { 746 _bfd_error_handler (_("%B: jump too far away\n"), input_bfd); 747 bfd_set_error (bfd_error_bad_value); 748 return FALSE; 749 } 750 tmp &= 0xfc000000; 751 tmp |= (targ / 4) & 0x3ffffff; 752 bfd_put_32 (input_bfd, tmp, mem); 753 break; 754 755 case MIPS_R_REFHI: 756 tmp = bfd_get_32 (input_bfd, mem); 757 switch (rel[1].r_type) 758 { 759 case MIPS_R_PAIR: 760 /* MS PE object */ 761 targ = val + rel[1].r_offset + ((tmp & 0xffff) << 16); 762 break; 763 case MIPS_R_REFLO: 764 /* GNU COFF object */ 765 low = bfd_get_32 (input_bfd, contents + rel[1].r_vaddr); 766 low &= 0xffff; 767 if (low & 0x8000) 768 low -= 0x10000; 769 targ = val + low + ((tmp & 0xffff) << 16); 770 break; 771 default: 772 _bfd_error_handler (_("%B: bad pair/reflo after refhi\n"), 773 input_bfd); 774 bfd_set_error (bfd_error_bad_value); 775 return FALSE; 776 } 777 tmp &= 0xffff0000; 778 tmp |= (targ >> 16) & 0xffff; 779 bfd_put_32 (input_bfd, tmp, mem); 780 break; 781 782 case MIPS_R_REFLO: 783 tmp = bfd_get_32 (input_bfd, mem); 784 targ = val + (tmp & 0xffff); 785 /* printf ("refword: src=%08x targ=%08x\n", src, targ); */ 786 tmp &= 0xffff0000; 787 tmp |= targ & 0xffff; 788 bfd_put_32 (input_bfd, tmp, mem); 789 break; 790 791 case MIPS_R_GPREL: 792 case MIPS_R_LITERAL: 793 UI ("gprel"); 794 break; 795 796 case MIPS_R_SECTION: 797 UI ("section"); 798 break; 799 800 case MIPS_R_SECREL: 801 UI ("secrel"); 802 break; 803 804 case MIPS_R_SECRELLO: 805 UI ("secrello"); 806 break; 807 808 case MIPS_R_SECRELHI: 809 UI ("secrelhi"); 810 break; 811 812 case MIPS_R_RVA: 813 tmp = bfd_get_32 (input_bfd, mem); 814 /* printf ("rva: src=%08x targ=%08x+%08x\n", src, tmp, val); */ 815 tmp += val 816 - pe_data (input_section->output_section->owner)->pe_opthdr.ImageBase; 817 bfd_put_32 (input_bfd, tmp, mem); 818 break; 819 820 case MIPS_R_PAIR: 821 /* ignore these */ 822 break; 823 } 824 } 825 826 return TRUE; 827} 828 829#define coff_relocate_section coff_pe_mips_relocate_section 830 831#ifdef TARGET_UNDERSCORE 832 833/* If mips gcc uses underscores for symbol names, then it does not use 834 a leading dot for local labels, so if TARGET_UNDERSCORE is defined 835 we treat all symbols starting with L as local. */ 836 837static bfd_boolean 838coff_mips_is_local_label_name (bfd *abfd, const char *name) 839{ 840 if (name[0] == 'L') 841 return TRUE; 842 843 return _bfd_coff_is_local_label_name (abfd, name); 844} 845 846#define coff_bfd_is_local_label_name coff_mips_is_local_label_name 847 848#endif /* TARGET_UNDERSCORE */ 849 850#define COFF_NO_HACK_SCNHDR_SIZE 851 852#ifndef bfd_pe_print_pdata 853#define bfd_pe_print_pdata NULL 854#endif 855 856#include "coffcode.h" 857 858const bfd_target 859#ifdef TARGET_SYM 860 TARGET_SYM = 861#else 862 mips_pe_le_vec = 863#endif 864{ 865#ifdef TARGET_NAME 866 TARGET_NAME, 867#else 868 "pe-mips", /* Name. */ 869#endif 870 bfd_target_coff_flavour, 871 BFD_ENDIAN_LITTLE, /* Data byte order is little. */ 872 BFD_ENDIAN_LITTLE, /* Header byte order is little. */ 873 874 (HAS_RELOC | EXEC_P | /* Object flags. */ 875 HAS_LINENO | HAS_DEBUG | 876 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 877 878#ifndef COFF_WITH_PE 879 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags. */ 880 | SEC_CODE | SEC_DATA), 881#else 882 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags. */ 883 | SEC_CODE | SEC_DATA 884 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES), 885#endif 886 887#ifdef TARGET_UNDERSCORE 888 TARGET_UNDERSCORE, /* Leading underscore. */ 889#else 890 0, /* leading underscore */ 891#endif 892 '/', /* AR_pad_char. */ 893 15, /* AR_max_namelen. */ 894 0, /* match priority. */ 895 896 bfd_getl64, bfd_getl_signed_64, bfd_putl64, 897 bfd_getl32, bfd_getl_signed_32, bfd_putl32, 898 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Data. */ 899 bfd_getl64, bfd_getl_signed_64, bfd_putl64, 900 bfd_getl32, bfd_getl_signed_32, bfd_putl32, 901 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Headers. */ 902 903 /* Note that we allow an object file to be treated as a core file as well. */ 904 {_bfd_dummy_target, coff_object_p, /* bfd_check_format. */ 905 bfd_generic_archive_p, coff_object_p}, 906 {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format. */ 907 bfd_false}, 908 {bfd_false, coff_write_object_contents, /* bfd_write_contents. */ 909 _bfd_write_archive_contents, bfd_false}, 910 911 BFD_JUMP_TABLE_GENERIC (coff), 912 BFD_JUMP_TABLE_COPY (coff), 913 BFD_JUMP_TABLE_CORE (_bfd_nocore), 914 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff), 915 BFD_JUMP_TABLE_SYMBOLS (coff), 916 BFD_JUMP_TABLE_RELOCS (coff), 917 BFD_JUMP_TABLE_WRITE (coff), 918 BFD_JUMP_TABLE_LINK (coff), 919 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 920 921 NULL, 922 923 COFF_SWAP_TABLE 924}; 925