1 /* BFD back-end for MIPS PE COFF files. 2 Copyright (C) 1990-2014 Free Software Foundation, Inc. 3 Modified from coff-i386.c by DJ Delorie, dj (at) 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 54 static bfd_reloc_status_type 55 coff_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. */ 144 145 static bfd_boolean 146 in_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 155 156 static 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 = howto_table + (dst)->r_type; 354 355 /* Compute the addend of a reloc. If the reloc is to a common symbol, 356 the object file contains the value of the common symbol. By the 357 time this is called, the linker may be using a different symbol 358 from a different object file with a different value. Therefore, we 359 hack wildly to locate the original symbol from this file so that we 360 can make the correct adjustment. This macro sets coffsym to the 361 symbol from the original file, and uses it to set the addend value 362 correctly. If this is not a common symbol, the usual addend 363 calculation is done, except that an additional tweak is needed for 364 PC relative relocs. 365 FIXME: This macro refers to symbols and asect; these are from the 366 calling function, not the macro arguments. */ 367 368 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \ 369 { \ 370 coff_symbol_type *coffsym = NULL; \ 371 if (ptr && bfd_asymbol_bfd (ptr) != abfd) \ 372 coffsym = (obj_symbols (abfd) \ 373 + (cache_ptr->sym_ptr_ptr - symbols)); \ 374 else if (ptr) \ 375 coffsym = coff_symbol_from (abfd, ptr); \ 376 if (coffsym != NULL \ 377 && coffsym->native->u.syment.n_scnum == 0) \ 378 cache_ptr->addend = - coffsym->native->u.syment.n_value; \ 379 else if (ptr && bfd_asymbol_bfd (ptr) == abfd \ 380 && ptr->section != NULL) \ 381 cache_ptr->addend = - (ptr->section->vma + ptr->value); \ 382 else \ 383 cache_ptr->addend = 0; \ 384 if (ptr && reloc.r_type < NUM_HOWTOS \ 385 && howto_table[reloc.r_type].pc_relative) \ 386 cache_ptr->addend += asect->vma; \ 387 } 388 389 /* Convert an rtype to howto for the COFF backend linker. */ 390 391 static reloc_howto_type * 392 coff_mips_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED, 393 asection *sec, 394 struct internal_reloc *rel, 395 struct coff_link_hash_entry *h, 396 struct internal_syment *sym, 397 bfd_vma *addendp) 398 { 399 400 reloc_howto_type *howto; 401 402 howto = howto_table + rel->r_type; 403 404 #ifdef COFF_WITH_PE 405 *addendp = 0; 406 #endif 407 408 if (howto->pc_relative) 409 *addendp += sec->vma; 410 411 if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0) 412 { 413 /* This is a common symbol. The section contents include the 414 size (sym->n_value) as an addend. The relocate_section 415 function will be adding in the final value of the symbol. We 416 need to subtract out the current size in order to get the 417 correct result. */ 418 419 BFD_ASSERT (h != NULL); 420 421 #ifndef COFF_WITH_PE 422 /* I think we *do* want to bypass this. If we don't, I have 423 seen some data parameters get the wrong relocation address. 424 If I link two versions with and without this section bypassed 425 and then do a binary comparison, the addresses which are 426 different can be looked up in the map. The case in which 427 this section has been bypassed has addresses which correspond 428 to values I can find in the map. */ 429 *addendp -= sym->n_value; 430 #endif 431 } 432 433 #ifndef COFF_WITH_PE 434 /* If the output symbol is common (in which case this must be a 435 relocatable link), we need to add in the final size of the 436 common symbol. */ 437 if (h != NULL && h->root.type == bfd_link_hash_common) 438 *addendp += h->root.u.c.size; 439 #endif 440 441 #ifdef COFF_WITH_PE 442 if (howto->pc_relative) 443 { 444 *addendp -= 4; 445 446 /* If the symbol is defined, then the generic code is going to 447 add back the symbol value in order to cancel out an 448 adjustment it made to the addend. However, we set the addend 449 to 0 at the start of this function. We need to adjust here, 450 to avoid the adjustment the generic code will make. FIXME: 451 This is getting a bit hackish. */ 452 if (sym != NULL && sym->n_scnum != 0) 453 *addendp -= sym->n_value; 454 } 455 456 if (rel->r_type == MIPS_R_RVA) 457 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase; 458 #endif 459 460 return howto; 461 } 462 463 #define coff_rtype_to_howto coff_mips_rtype_to_howto 464 #define coff_bfd_reloc_type_lookup coff_mips_reloc_type_lookup 465 #define coff_bfd_reloc_name_lookup coff_mips_reloc_name_lookup 466 467 /* Get the howto structure for a generic reloc type. */ 468 469 static reloc_howto_type * 470 coff_mips_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 471 bfd_reloc_code_real_type code) 472 { 473 int mips_type; 474 475 switch (code) 476 { 477 case BFD_RELOC_16: 478 mips_type = MIPS_R_REFHALF; 479 break; 480 case BFD_RELOC_32: 481 case BFD_RELOC_CTOR: 482 mips_type = MIPS_R_REFWORD; 483 break; 484 case BFD_RELOC_MIPS_JMP: 485 mips_type = MIPS_R_JMPADDR; 486 break; 487 case BFD_RELOC_HI16_S: 488 mips_type = MIPS_R_REFHI; 489 break; 490 case BFD_RELOC_LO16: 491 mips_type = MIPS_R_REFLO; 492 break; 493 case BFD_RELOC_GPREL16: 494 mips_type = MIPS_R_GPREL; 495 break; 496 case BFD_RELOC_MIPS_LITERAL: 497 mips_type = MIPS_R_LITERAL; 498 break; 499 case BFD_RELOC_RVA: 500 mips_type = MIPS_R_RVA; 501 break; 502 default: 503 return NULL; 504 } 505 506 return & howto_table [mips_type]; 507 } 508 509 static reloc_howto_type * 510 coff_mips_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 511 const char *r_name) 512 { 513 unsigned int i; 514 515 for (i = 0; i < NUM_HOWTOS; i++) 516 if (howto_table[i].name != NULL 517 && strcasecmp (howto_table[i].name, r_name) == 0) 518 return &howto_table[i]; 519 520 return NULL; 521 } 522 523 static void 524 mips_swap_reloc_in (bfd * abfd, void * src, void * dst) 525 { 526 static struct internal_reloc pair_prev; 527 RELOC *reloc_src = (RELOC *) src; 528 struct internal_reloc *reloc_dst = (struct internal_reloc *) dst; 529 530 reloc_dst->r_vaddr = H_GET_32 (abfd, reloc_src->r_vaddr); 531 reloc_dst->r_symndx = H_GET_S32 (abfd, reloc_src->r_symndx); 532 reloc_dst->r_type = H_GET_16 (abfd, reloc_src->r_type); 533 reloc_dst->r_size = 0; 534 reloc_dst->r_extern = 0; 535 reloc_dst->r_offset = 0; 536 537 switch (reloc_dst->r_type) 538 { 539 case MIPS_R_REFHI: 540 pair_prev = *reloc_dst; 541 break; 542 case MIPS_R_PAIR: 543 reloc_dst->r_offset = reloc_dst->r_symndx; 544 if (reloc_dst->r_offset & 0x8000) 545 reloc_dst->r_offset -= 0x10000; 546 reloc_dst->r_symndx = pair_prev.r_symndx; 547 break; 548 } 549 } 550 551 static unsigned int 552 mips_swap_reloc_out (bfd * abfd, void * src, void * dst) 553 { 554 static bfd_vma prev_addr = 0; 555 struct internal_reloc *reloc_src = (struct internal_reloc *)src; 556 struct external_reloc *reloc_dst = (struct external_reloc *)dst; 557 558 switch (reloc_src->r_type) 559 { 560 case MIPS_R_REFHI: 561 prev_addr = reloc_src->r_vaddr; 562 break; 563 case MIPS_R_REFLO: 564 if (reloc_src->r_vaddr == prev_addr) 565 { 566 /* FIXME: only slightly hackish. If we see a REFLO pointing to 567 the same address as a REFHI, we assume this is the matching 568 PAIR reloc and output it accordingly. The symndx is really 569 the low 16 bits of the addend */ 570 H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr); 571 H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx); 572 H_PUT_16 (abfd, MIPS_R_PAIR, reloc_dst->r_type); 573 return RELSZ; 574 } 575 break; 576 } 577 578 H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr); 579 H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx); 580 581 H_PUT_16 (abfd, reloc_src->r_type, reloc_dst->r_type); 582 return RELSZ; 583 } 584 585 #define coff_swap_reloc_in mips_swap_reloc_in 586 #define coff_swap_reloc_out mips_swap_reloc_out 587 #define NO_COFF_RELOCS 588 589 static bfd_boolean 590 coff_pe_mips_relocate_section (bfd *output_bfd, 591 struct bfd_link_info *info, 592 bfd *input_bfd, 593 asection *input_section, 594 bfd_byte *contents, 595 struct internal_reloc *relocs, 596 struct internal_syment *syms, 597 asection **sections) 598 { 599 struct internal_reloc *rel; 600 struct internal_reloc *rel_end; 601 unsigned int i; 602 603 if (info->relocatable) 604 { 605 (*_bfd_error_handler) 606 (_("%B: `ld -r' not supported with PE MIPS objects\n"), input_bfd); 607 bfd_set_error (bfd_error_bad_value); 608 return FALSE; 609 } 610 611 BFD_ASSERT (input_bfd->xvec->byteorder 612 == output_bfd->xvec->byteorder); 613 614 rel = relocs; 615 rel_end = rel + input_section->reloc_count; 616 617 for (i = 0; rel < rel_end; rel++, i++) 618 { 619 long symndx; 620 struct coff_link_hash_entry *h; 621 struct internal_syment *sym; 622 bfd_vma addend = 0; 623 bfd_vma val, tmp, targ, src, low; 624 reloc_howto_type *howto; 625 unsigned char *mem = contents + rel->r_vaddr; 626 627 symndx = rel->r_symndx; 628 629 if (symndx == -1) 630 { 631 h = NULL; 632 sym = NULL; 633 } 634 else 635 { 636 h = obj_coff_sym_hashes (input_bfd)[symndx]; 637 sym = syms + symndx; 638 } 639 640 /* COFF treats common symbols in one of two ways. Either the 641 size of the symbol is included in the section contents, or it 642 is not. We assume that the size is not included, and force 643 the rtype_to_howto function to adjust the addend as needed. */ 644 645 if (sym != NULL && sym->n_scnum != 0) 646 addend = - sym->n_value; 647 else 648 addend = 0; 649 650 howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h, 651 sym, &addend); 652 if (howto == NULL) 653 return FALSE; 654 655 /* If we are doing a relocatable link, then we can just ignore 656 a PC relative reloc that is pcrel_offset. It will already 657 have the correct value. If this is not a relocatable link, 658 then we should ignore the symbol value. */ 659 if (howto->pc_relative && howto->pcrel_offset) 660 { 661 if (info->relocatable) 662 continue; 663 if (sym != NULL && sym->n_scnum != 0) 664 addend += sym->n_value; 665 } 666 667 val = 0; 668 669 if (h == NULL) 670 { 671 asection *sec; 672 673 if (symndx == -1) 674 { 675 sec = bfd_abs_section_ptr; 676 val = 0; 677 } 678 else 679 { 680 sec = sections[symndx]; 681 val = (sec->output_section->vma 682 + sec->output_offset 683 + sym->n_value); 684 if (! obj_pe (input_bfd)) 685 val -= sec->vma; 686 } 687 } 688 else 689 { 690 if (h->root.type == bfd_link_hash_defined 691 || h->root.type == bfd_link_hash_defweak) 692 { 693 asection *sec; 694 695 sec = h->root.u.def.section; 696 val = (h->root.u.def.value 697 + sec->output_section->vma 698 + sec->output_offset); 699 } 700 701 else if (! info->relocatable) 702 { 703 if (! ((*info->callbacks->undefined_symbol) 704 (info, h->root.root.string, input_bfd, input_section, 705 rel->r_vaddr - input_section->vma, TRUE))) 706 return FALSE; 707 } 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) (*_bfd_error_handler) (_("%B: unimplemented %s\n"), \ 719 input_bfd, x); \ 720 bfd_set_error (bfd_error_bad_value); 721 722 switch (rel->r_type) 723 { 724 case MIPS_R_ABSOLUTE: 725 /* Ignore these. */ 726 break; 727 728 case MIPS_R_REFHALF: 729 UI ("refhalf"); 730 break; 731 732 case MIPS_R_REFWORD: 733 tmp = bfd_get_32 (input_bfd, mem); 734 /* printf ("refword: src=%08x targ=%08x+%08x\n", src, tmp, val); */ 735 tmp += val; 736 bfd_put_32 (input_bfd, tmp, mem); 737 break; 738 739 case MIPS_R_JMPADDR: 740 tmp = bfd_get_32 (input_bfd, mem); 741 targ = val + (tmp & 0x03ffffff) * 4; 742 if ((src & 0xf0000000) != (targ & 0xf0000000)) 743 { 744 (*_bfd_error_handler) (_("%B: jump too far away\n"), input_bfd); 745 bfd_set_error (bfd_error_bad_value); 746 return FALSE; 747 } 748 tmp &= 0xfc000000; 749 tmp |= (targ / 4) & 0x3ffffff; 750 bfd_put_32 (input_bfd, tmp, mem); 751 break; 752 753 case MIPS_R_REFHI: 754 tmp = bfd_get_32 (input_bfd, mem); 755 switch (rel[1].r_type) 756 { 757 case MIPS_R_PAIR: 758 /* MS PE object */ 759 targ = val + rel[1].r_offset + ((tmp & 0xffff) << 16); 760 break; 761 case MIPS_R_REFLO: 762 /* GNU COFF object */ 763 low = bfd_get_32 (input_bfd, contents + rel[1].r_vaddr); 764 low &= 0xffff; 765 if (low & 0x8000) 766 low -= 0x10000; 767 targ = val + low + ((tmp & 0xffff) << 16); 768 break; 769 default: 770 (*_bfd_error_handler) (_("%B: bad pair/reflo after refhi\n"), 771 input_bfd); 772 bfd_set_error (bfd_error_bad_value); 773 return FALSE; 774 } 775 tmp &= 0xffff0000; 776 tmp |= (targ >> 16) & 0xffff; 777 bfd_put_32 (input_bfd, tmp, mem); 778 break; 779 780 case MIPS_R_REFLO: 781 tmp = bfd_get_32 (input_bfd, mem); 782 targ = val + (tmp & 0xffff); 783 /* printf ("refword: src=%08x targ=%08x\n", src, targ); */ 784 tmp &= 0xffff0000; 785 tmp |= targ & 0xffff; 786 bfd_put_32 (input_bfd, tmp, mem); 787 break; 788 789 case MIPS_R_GPREL: 790 case MIPS_R_LITERAL: 791 UI ("gprel"); 792 break; 793 794 case MIPS_R_SECTION: 795 UI ("section"); 796 break; 797 798 case MIPS_R_SECREL: 799 UI ("secrel"); 800 break; 801 802 case MIPS_R_SECRELLO: 803 UI ("secrello"); 804 break; 805 806 case MIPS_R_SECRELHI: 807 UI ("secrelhi"); 808 break; 809 810 case MIPS_R_RVA: 811 tmp = bfd_get_32 (input_bfd, mem); 812 /* printf ("rva: src=%08x targ=%08x+%08x\n", src, tmp, val); */ 813 tmp += val 814 - pe_data (input_section->output_section->owner)->pe_opthdr.ImageBase; 815 bfd_put_32 (input_bfd, tmp, mem); 816 break; 817 818 case MIPS_R_PAIR: 819 /* ignore these */ 820 break; 821 } 822 } 823 824 return TRUE; 825 } 826 827 #define coff_relocate_section coff_pe_mips_relocate_section 828 829 #ifdef TARGET_UNDERSCORE 830 831 /* If mips gcc uses underscores for symbol names, then it does not use 832 a leading dot for local labels, so if TARGET_UNDERSCORE is defined 833 we treat all symbols starting with L as local. */ 834 835 static bfd_boolean 836 coff_mips_is_local_label_name (bfd *abfd, const char *name) 837 { 838 if (name[0] == 'L') 839 return TRUE; 840 841 return _bfd_coff_is_local_label_name (abfd, name); 842 } 843 844 #define coff_bfd_is_local_label_name coff_mips_is_local_label_name 845 846 #endif /* TARGET_UNDERSCORE */ 847 848 #define COFF_NO_HACK_SCNHDR_SIZE 849 850 #ifndef bfd_pe_print_pdata 851 #define bfd_pe_print_pdata NULL 852 #endif 853 854 #include "coffcode.h" 855 856 const bfd_target 857 #ifdef TARGET_SYM 858 TARGET_SYM = 859 #else 860 mips_pe_le_vec = 861 #endif 862 { 863 #ifdef TARGET_NAME 864 TARGET_NAME, 865 #else 866 "pe-mips", /* Name. */ 867 #endif 868 bfd_target_coff_flavour, 869 BFD_ENDIAN_LITTLE, /* Data byte order is little. */ 870 BFD_ENDIAN_LITTLE, /* Header byte order is little. */ 871 872 (HAS_RELOC | EXEC_P | /* Object flags. */ 873 HAS_LINENO | HAS_DEBUG | 874 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 875 876 #ifndef COFF_WITH_PE 877 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags. */ 878 | SEC_CODE | SEC_DATA), 879 #else 880 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags. */ 881 | SEC_CODE | SEC_DATA 882 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES), 883 #endif 884 885 #ifdef TARGET_UNDERSCORE 886 TARGET_UNDERSCORE, /* Leading underscore. */ 887 #else 888 0, /* leading underscore */ 889 #endif 890 '/', /* AR_pad_char. */ 891 15, /* AR_max_namelen. */ 892 0, /* match priority. */ 893 894 bfd_getl64, bfd_getl_signed_64, bfd_putl64, 895 bfd_getl32, bfd_getl_signed_32, bfd_putl32, 896 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Data. */ 897 bfd_getl64, bfd_getl_signed_64, bfd_putl64, 898 bfd_getl32, bfd_getl_signed_32, bfd_putl32, 899 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Headers. */ 900 901 /* Note that we allow an object file to be treated as a core file as well. */ 902 {_bfd_dummy_target, coff_object_p, /* bfd_check_format. */ 903 bfd_generic_archive_p, coff_object_p}, 904 {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format. */ 905 bfd_false}, 906 {bfd_false, coff_write_object_contents, /* bfd_write_contents. */ 907 _bfd_write_archive_contents, bfd_false}, 908 909 BFD_JUMP_TABLE_GENERIC (coff), 910 BFD_JUMP_TABLE_COPY (coff), 911 BFD_JUMP_TABLE_CORE (_bfd_nocore), 912 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff), 913 BFD_JUMP_TABLE_SYMBOLS (coff), 914 BFD_JUMP_TABLE_RELOCS (coff), 915 BFD_JUMP_TABLE_WRITE (coff), 916 BFD_JUMP_TABLE_LINK (coff), 917 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 918 919 NULL, 920 921 COFF_SWAP_TABLE 922 }; 923
