1 /* Support for the generic parts of PE/PEI, for BFD. 2 Copyright 1995-2013 Free Software Foundation, Inc. 3 Written by Cygnus Solutions. 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 23 /* Most of this hacked by Steve Chamberlain, 24 sac@cygnus.com 25 26 PE/PEI rearrangement (and code added): Donn Terry 27 Softway Systems, Inc. */ 28 29 /* Hey look, some documentation [and in a place you expect to find it]! 30 31 The main reference for the pei format is "Microsoft Portable Executable 32 and Common Object File Format Specification 4.1". Get it if you need to 33 do some serious hacking on this code. 34 35 Another reference: 36 "Peering Inside the PE: A Tour of the Win32 Portable Executable 37 File Format", MSJ 1994, Volume 9. 38 39 The *sole* difference between the pe format and the pei format is that the 40 latter has an MSDOS 2.0 .exe header on the front that prints the message 41 "This app must be run under Windows." (or some such). 42 (FIXME: Whether that statement is *really* true or not is unknown. 43 Are there more subtle differences between pe and pei formats? 44 For now assume there aren't. If you find one, then for God sakes 45 document it here!) 46 47 The Microsoft docs use the word "image" instead of "executable" because 48 the former can also refer to a DLL (shared library). Confusion can arise 49 because the `i' in `pei' also refers to "image". The `pe' format can 50 also create images (i.e. executables), it's just that to run on a win32 51 system you need to use the pei format. 52 53 FIXME: Please add more docs here so the next poor fool that has to hack 54 on this code has a chance of getting something accomplished without 55 wasting too much time. */ 56 57 #include "libpei.h" 58 59 static bfd_boolean (*pe_saved_coff_bfd_print_private_bfd_data) (bfd *, void *) = 60 #ifndef coff_bfd_print_private_bfd_data 61 NULL; 62 #else 63 coff_bfd_print_private_bfd_data; 64 #undef coff_bfd_print_private_bfd_data 65 #endif 66 67 static bfd_boolean pe_print_private_bfd_data (bfd *, void *); 68 #define coff_bfd_print_private_bfd_data pe_print_private_bfd_data 69 70 static bfd_boolean (*pe_saved_coff_bfd_copy_private_bfd_data) (bfd *, bfd *) = 71 #ifndef coff_bfd_copy_private_bfd_data 72 NULL; 73 #else 74 coff_bfd_copy_private_bfd_data; 75 #undef coff_bfd_copy_private_bfd_data 76 #endif 77 78 static bfd_boolean pe_bfd_copy_private_bfd_data (bfd *, bfd *); 79 #define coff_bfd_copy_private_bfd_data pe_bfd_copy_private_bfd_data 80 81 #define coff_mkobject pe_mkobject 82 #define coff_mkobject_hook pe_mkobject_hook 83 84 #ifdef COFF_IMAGE_WITH_PE 85 /* This structure contains static variables used by the ILF code. */ 86 typedef asection * asection_ptr; 87 88 typedef struct 89 { 90 bfd * abfd; 91 bfd_byte * data; 92 struct bfd_in_memory * bim; 93 unsigned short magic; 94 95 arelent * reltab; 96 unsigned int relcount; 97 98 coff_symbol_type * sym_cache; 99 coff_symbol_type * sym_ptr; 100 unsigned int sym_index; 101 102 unsigned int * sym_table; 103 unsigned int * table_ptr; 104 105 combined_entry_type * native_syms; 106 combined_entry_type * native_ptr; 107 108 coff_symbol_type ** sym_ptr_table; 109 coff_symbol_type ** sym_ptr_ptr; 110 111 unsigned int sec_index; 112 113 char * string_table; 114 char * string_ptr; 115 char * end_string_ptr; 116 117 SYMENT * esym_table; 118 SYMENT * esym_ptr; 119 120 struct internal_reloc * int_reltab; 121 } 122 pe_ILF_vars; 123 #endif /* COFF_IMAGE_WITH_PE */ 124 125 const bfd_target *coff_real_object_p 126 (bfd *, unsigned, struct internal_filehdr *, struct internal_aouthdr *); 127 128 #ifndef NO_COFF_RELOCS 129 static void 130 coff_swap_reloc_in (bfd * abfd, void * src, void * dst) 131 { 132 RELOC *reloc_src = (RELOC *) src; 133 struct internal_reloc *reloc_dst = (struct internal_reloc *) dst; 134 135 reloc_dst->r_vaddr = H_GET_32 (abfd, reloc_src->r_vaddr); 136 reloc_dst->r_symndx = H_GET_S32 (abfd, reloc_src->r_symndx); 137 reloc_dst->r_type = H_GET_16 (abfd, reloc_src->r_type); 138 #ifdef SWAP_IN_RELOC_OFFSET 139 reloc_dst->r_offset = SWAP_IN_RELOC_OFFSET (abfd, reloc_src->r_offset); 140 #endif 141 } 142 143 static unsigned int 144 coff_swap_reloc_out (bfd * abfd, void * src, void * dst) 145 { 146 struct internal_reloc *reloc_src = (struct internal_reloc *) src; 147 struct external_reloc *reloc_dst = (struct external_reloc *) dst; 148 149 H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr); 150 H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx); 151 H_PUT_16 (abfd, reloc_src->r_type, reloc_dst->r_type); 152 153 #ifdef SWAP_OUT_RELOC_OFFSET 154 SWAP_OUT_RELOC_OFFSET (abfd, reloc_src->r_offset, reloc_dst->r_offset); 155 #endif 156 #ifdef SWAP_OUT_RELOC_EXTRA 157 SWAP_OUT_RELOC_EXTRA (abfd, reloc_src, reloc_dst); 158 #endif 159 return RELSZ; 160 } 161 #endif /* not NO_COFF_RELOCS */ 162 163 #ifdef COFF_IMAGE_WITH_PE 164 #undef FILHDR 165 #define FILHDR struct external_PEI_IMAGE_hdr 166 #endif 167 168 static void 169 coff_swap_filehdr_in (bfd * abfd, void * src, void * dst) 170 { 171 FILHDR *filehdr_src = (FILHDR *) src; 172 struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst; 173 174 filehdr_dst->f_magic = H_GET_16 (abfd, filehdr_src->f_magic); 175 filehdr_dst->f_nscns = H_GET_16 (abfd, filehdr_src->f_nscns); 176 filehdr_dst->f_timdat = H_GET_32 (abfd, filehdr_src->f_timdat); 177 filehdr_dst->f_nsyms = H_GET_32 (abfd, filehdr_src->f_nsyms); 178 filehdr_dst->f_flags = H_GET_16 (abfd, filehdr_src->f_flags); 179 filehdr_dst->f_symptr = H_GET_32 (abfd, filehdr_src->f_symptr); 180 181 /* Other people's tools sometimes generate headers with an nsyms but 182 a zero symptr. */ 183 if (filehdr_dst->f_nsyms != 0 && filehdr_dst->f_symptr == 0) 184 { 185 filehdr_dst->f_nsyms = 0; 186 filehdr_dst->f_flags |= F_LSYMS; 187 } 188 189 filehdr_dst->f_opthdr = H_GET_16 (abfd, filehdr_src-> f_opthdr); 190 } 191 192 #ifdef COFF_IMAGE_WITH_PE 193 # define coff_swap_filehdr_out _bfd_XXi_only_swap_filehdr_out 194 #elif defined COFF_WITH_pex64 195 # define coff_swap_filehdr_out _bfd_pex64_only_swap_filehdr_out 196 #elif defined COFF_WITH_pep 197 # define coff_swap_filehdr_out _bfd_pep_only_swap_filehdr_out 198 #else 199 # define coff_swap_filehdr_out _bfd_pe_only_swap_filehdr_out 200 #endif 201 202 static void 203 coff_swap_scnhdr_in (bfd * abfd, void * ext, void * in) 204 { 205 SCNHDR *scnhdr_ext = (SCNHDR *) ext; 206 struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; 207 208 memcpy (scnhdr_int->s_name, scnhdr_ext->s_name, sizeof (scnhdr_int->s_name)); 209 210 scnhdr_int->s_vaddr = GET_SCNHDR_VADDR (abfd, scnhdr_ext->s_vaddr); 211 scnhdr_int->s_paddr = GET_SCNHDR_PADDR (abfd, scnhdr_ext->s_paddr); 212 scnhdr_int->s_size = GET_SCNHDR_SIZE (abfd, scnhdr_ext->s_size); 213 scnhdr_int->s_scnptr = GET_SCNHDR_SCNPTR (abfd, scnhdr_ext->s_scnptr); 214 scnhdr_int->s_relptr = GET_SCNHDR_RELPTR (abfd, scnhdr_ext->s_relptr); 215 scnhdr_int->s_lnnoptr = GET_SCNHDR_LNNOPTR (abfd, scnhdr_ext->s_lnnoptr); 216 scnhdr_int->s_flags = H_GET_32 (abfd, scnhdr_ext->s_flags); 217 218 /* MS handles overflow of line numbers by carrying into the reloc 219 field (it appears). Since it's supposed to be zero for PE 220 *IMAGE* format, that's safe. This is still a bit iffy. */ 221 #ifdef COFF_IMAGE_WITH_PE 222 scnhdr_int->s_nlnno = (H_GET_16 (abfd, scnhdr_ext->s_nlnno) 223 + (H_GET_16 (abfd, scnhdr_ext->s_nreloc) << 16)); 224 scnhdr_int->s_nreloc = 0; 225 #else 226 scnhdr_int->s_nreloc = H_GET_16 (abfd, scnhdr_ext->s_nreloc); 227 scnhdr_int->s_nlnno = H_GET_16 (abfd, scnhdr_ext->s_nlnno); 228 #endif 229 230 if (scnhdr_int->s_vaddr != 0) 231 { 232 scnhdr_int->s_vaddr += pe_data (abfd)->pe_opthdr.ImageBase; 233 /* Do not cut upper 32-bits for 64-bit vma. */ 234 #ifndef COFF_WITH_pex64 235 scnhdr_int->s_vaddr &= 0xffffffff; 236 #endif 237 } 238 239 #ifndef COFF_NO_HACK_SCNHDR_SIZE 240 /* If this section holds uninitialized data and is from an object file 241 or from an executable image that has not initialized the field, 242 or if the image is an executable file and the physical size is padded, 243 use the virtual size (stored in s_paddr) instead. */ 244 if (scnhdr_int->s_paddr > 0 245 && (((scnhdr_int->s_flags & IMAGE_SCN_CNT_UNINITIALIZED_DATA) != 0 246 && (! bfd_pei_p (abfd) || scnhdr_int->s_size == 0)) 247 || (bfd_pei_p (abfd) && (scnhdr_int->s_size > scnhdr_int->s_paddr)))) 248 /* This code used to set scnhdr_int->s_paddr to 0. However, 249 coff_set_alignment_hook stores s_paddr in virt_size, which 250 only works if it correctly holds the virtual size of the 251 section. */ 252 scnhdr_int->s_size = scnhdr_int->s_paddr; 253 #endif 254 } 255 256 static bfd_boolean 257 pe_mkobject (bfd * abfd) 258 { 259 pe_data_type *pe; 260 bfd_size_type amt = sizeof (pe_data_type); 261 262 abfd->tdata.pe_obj_data = (struct pe_tdata *) bfd_zalloc (abfd, amt); 263 264 if (abfd->tdata.pe_obj_data == 0) 265 return FALSE; 266 267 pe = pe_data (abfd); 268 269 pe->coff.pe = 1; 270 271 /* in_reloc_p is architecture dependent. */ 272 pe->in_reloc_p = in_reloc_p; 273 274 return TRUE; 275 } 276 277 /* Create the COFF backend specific information. */ 278 279 static void * 280 pe_mkobject_hook (bfd * abfd, 281 void * filehdr, 282 void * aouthdr ATTRIBUTE_UNUSED) 283 { 284 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr; 285 pe_data_type *pe; 286 287 if (! pe_mkobject (abfd)) 288 return NULL; 289 290 pe = pe_data (abfd); 291 pe->coff.sym_filepos = internal_f->f_symptr; 292 /* These members communicate important constants about the symbol 293 table to GDB's symbol-reading code. These `constants' 294 unfortunately vary among coff implementations... */ 295 pe->coff.local_n_btmask = N_BTMASK; 296 pe->coff.local_n_btshft = N_BTSHFT; 297 pe->coff.local_n_tmask = N_TMASK; 298 pe->coff.local_n_tshift = N_TSHIFT; 299 pe->coff.local_symesz = SYMESZ; 300 pe->coff.local_auxesz = AUXESZ; 301 pe->coff.local_linesz = LINESZ; 302 303 pe->coff.timestamp = internal_f->f_timdat; 304 305 obj_raw_syment_count (abfd) = 306 obj_conv_table_size (abfd) = 307 internal_f->f_nsyms; 308 309 pe->real_flags = internal_f->f_flags; 310 311 if ((internal_f->f_flags & F_DLL) != 0) 312 pe->dll = 1; 313 314 if ((internal_f->f_flags & IMAGE_FILE_DEBUG_STRIPPED) == 0) 315 abfd->flags |= HAS_DEBUG; 316 317 #ifdef COFF_IMAGE_WITH_PE 318 if (aouthdr) 319 pe->pe_opthdr = ((struct internal_aouthdr *) aouthdr)->pe; 320 #endif 321 322 #ifdef ARM 323 if (! _bfd_coff_arm_set_private_flags (abfd, internal_f->f_flags)) 324 coff_data (abfd) ->flags = 0; 325 #endif 326 327 return (void *) pe; 328 } 329 330 static bfd_boolean 331 pe_print_private_bfd_data (bfd *abfd, void * vfile) 332 { 333 FILE *file = (FILE *) vfile; 334 335 if (!_bfd_XX_print_private_bfd_data_common (abfd, vfile)) 336 return FALSE; 337 338 if (pe_saved_coff_bfd_print_private_bfd_data == NULL) 339 return TRUE; 340 341 fputc ('\n', file); 342 343 return pe_saved_coff_bfd_print_private_bfd_data (abfd, vfile); 344 } 345 346 /* Copy any private info we understand from the input bfd 347 to the output bfd. */ 348 349 static bfd_boolean 350 pe_bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 351 { 352 /* PR binutils/716: Copy the large address aware flag. 353 XXX: Should we be copying other flags or other fields in the pe_data() 354 structure ? */ 355 if (pe_data (obfd) != NULL 356 && pe_data (ibfd) != NULL 357 && pe_data (ibfd)->real_flags & IMAGE_FILE_LARGE_ADDRESS_AWARE) 358 pe_data (obfd)->real_flags |= IMAGE_FILE_LARGE_ADDRESS_AWARE; 359 360 if (!_bfd_XX_bfd_copy_private_bfd_data_common (ibfd, obfd)) 361 return FALSE; 362 363 if (pe_saved_coff_bfd_copy_private_bfd_data) 364 return pe_saved_coff_bfd_copy_private_bfd_data (ibfd, obfd); 365 366 return TRUE; 367 } 368 369 #define coff_bfd_copy_private_section_data \ 370 _bfd_XX_bfd_copy_private_section_data 371 372 #define coff_get_symbol_info _bfd_XX_get_symbol_info 373 374 #ifdef COFF_IMAGE_WITH_PE 375 376 /* Code to handle Microsoft's Image Library Format. 377 Also known as LINK6 format. 378 Documentation about this format can be found at: 379 380 http://msdn.microsoft.com/library/specs/pecoff_section8.htm */ 381 382 /* The following constants specify the sizes of the various data 383 structures that we have to create in order to build a bfd describing 384 an ILF object file. The final "+ 1" in the definitions of SIZEOF_IDATA6 385 and SIZEOF_IDATA7 below is to allow for the possibility that we might 386 need a padding byte in order to ensure 16 bit alignment for the section's 387 contents. 388 389 The value for SIZEOF_ILF_STRINGS is computed as follows: 390 391 There will be NUM_ILF_SECTIONS section symbols. Allow 9 characters 392 per symbol for their names (longest section name is .idata$x). 393 394 There will be two symbols for the imported value, one the symbol name 395 and one with _imp__ prefixed. Allowing for the terminating nul's this 396 is strlen (symbol_name) * 2 + 8 + 21 + strlen (source_dll). 397 398 The strings in the string table must start STRING__SIZE_SIZE bytes into 399 the table in order to for the string lookup code in coffgen/coffcode to 400 work. */ 401 #define NUM_ILF_RELOCS 8 402 #define NUM_ILF_SECTIONS 6 403 #define NUM_ILF_SYMS (2 + NUM_ILF_SECTIONS) 404 405 #define SIZEOF_ILF_SYMS (NUM_ILF_SYMS * sizeof (* vars.sym_cache)) 406 #define SIZEOF_ILF_SYM_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_table)) 407 #define SIZEOF_ILF_NATIVE_SYMS (NUM_ILF_SYMS * sizeof (* vars.native_syms)) 408 #define SIZEOF_ILF_SYM_PTR_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_ptr_table)) 409 #define SIZEOF_ILF_EXT_SYMS (NUM_ILF_SYMS * sizeof (* vars.esym_table)) 410 #define SIZEOF_ILF_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.reltab)) 411 #define SIZEOF_ILF_INT_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.int_reltab)) 412 #define SIZEOF_ILF_STRINGS (strlen (symbol_name) * 2 + 8 \ 413 + 21 + strlen (source_dll) \ 414 + NUM_ILF_SECTIONS * 9 \ 415 + STRING_SIZE_SIZE) 416 #define SIZEOF_IDATA2 (5 * 4) 417 418 /* For PEx64 idata4 & 5 have thumb size of 8 bytes. */ 419 #ifdef COFF_WITH_pex64 420 #define SIZEOF_IDATA4 (2 * 4) 421 #define SIZEOF_IDATA5 (2 * 4) 422 #else 423 #define SIZEOF_IDATA4 (1 * 4) 424 #define SIZEOF_IDATA5 (1 * 4) 425 #endif 426 427 #define SIZEOF_IDATA6 (2 + strlen (symbol_name) + 1 + 1) 428 #define SIZEOF_IDATA7 (strlen (source_dll) + 1 + 1) 429 #define SIZEOF_ILF_SECTIONS (NUM_ILF_SECTIONS * sizeof (struct coff_section_tdata)) 430 431 #define ILF_DATA_SIZE \ 432 + SIZEOF_ILF_SYMS \ 433 + SIZEOF_ILF_SYM_TABLE \ 434 + SIZEOF_ILF_NATIVE_SYMS \ 435 + SIZEOF_ILF_SYM_PTR_TABLE \ 436 + SIZEOF_ILF_EXT_SYMS \ 437 + SIZEOF_ILF_RELOCS \ 438 + SIZEOF_ILF_INT_RELOCS \ 439 + SIZEOF_ILF_STRINGS \ 440 + SIZEOF_IDATA2 \ 441 + SIZEOF_IDATA4 \ 442 + SIZEOF_IDATA5 \ 443 + SIZEOF_IDATA6 \ 444 + SIZEOF_IDATA7 \ 445 + SIZEOF_ILF_SECTIONS \ 446 + MAX_TEXT_SECTION_SIZE 447 448 /* Create an empty relocation against the given symbol. */ 449 450 static void 451 pe_ILF_make_a_symbol_reloc (pe_ILF_vars * vars, 452 bfd_vma address, 453 bfd_reloc_code_real_type reloc, 454 struct bfd_symbol ** sym, 455 unsigned int sym_index) 456 { 457 arelent * entry; 458 struct internal_reloc * internal; 459 460 entry = vars->reltab + vars->relcount; 461 internal = vars->int_reltab + vars->relcount; 462 463 entry->address = address; 464 entry->addend = 0; 465 entry->howto = bfd_reloc_type_lookup (vars->abfd, reloc); 466 entry->sym_ptr_ptr = sym; 467 468 internal->r_vaddr = address; 469 internal->r_symndx = sym_index; 470 internal->r_type = entry->howto->type; 471 472 vars->relcount ++; 473 474 BFD_ASSERT (vars->relcount <= NUM_ILF_RELOCS); 475 } 476 477 /* Create an empty relocation against the given section. */ 478 479 static void 480 pe_ILF_make_a_reloc (pe_ILF_vars * vars, 481 bfd_vma address, 482 bfd_reloc_code_real_type reloc, 483 asection_ptr sec) 484 { 485 pe_ILF_make_a_symbol_reloc (vars, address, reloc, sec->symbol_ptr_ptr, 486 coff_section_data (vars->abfd, sec)->i); 487 } 488 489 /* Move the queued relocs into the given section. */ 490 491 static void 492 pe_ILF_save_relocs (pe_ILF_vars * vars, 493 asection_ptr sec) 494 { 495 /* Make sure that there is somewhere to store the internal relocs. */ 496 if (coff_section_data (vars->abfd, sec) == NULL) 497 /* We should probably return an error indication here. */ 498 abort (); 499 500 coff_section_data (vars->abfd, sec)->relocs = vars->int_reltab; 501 coff_section_data (vars->abfd, sec)->keep_relocs = TRUE; 502 503 sec->relocation = vars->reltab; 504 sec->reloc_count = vars->relcount; 505 sec->flags |= SEC_RELOC; 506 507 vars->reltab += vars->relcount; 508 vars->int_reltab += vars->relcount; 509 vars->relcount = 0; 510 511 BFD_ASSERT ((bfd_byte *) vars->int_reltab < (bfd_byte *) vars->string_table); 512 } 513 514 /* Create a global symbol and add it to the relevant tables. */ 515 516 static void 517 pe_ILF_make_a_symbol (pe_ILF_vars * vars, 518 const char * prefix, 519 const char * symbol_name, 520 asection_ptr section, 521 flagword extra_flags) 522 { 523 coff_symbol_type * sym; 524 combined_entry_type * ent; 525 SYMENT * esym; 526 unsigned short sclass; 527 528 if (extra_flags & BSF_LOCAL) 529 sclass = C_STAT; 530 else 531 sclass = C_EXT; 532 533 #ifdef THUMBPEMAGIC 534 if (vars->magic == THUMBPEMAGIC) 535 { 536 if (extra_flags & BSF_FUNCTION) 537 sclass = C_THUMBEXTFUNC; 538 else if (extra_flags & BSF_LOCAL) 539 sclass = C_THUMBSTAT; 540 else 541 sclass = C_THUMBEXT; 542 } 543 #endif 544 545 BFD_ASSERT (vars->sym_index < NUM_ILF_SYMS); 546 547 sym = vars->sym_ptr; 548 ent = vars->native_ptr; 549 esym = vars->esym_ptr; 550 551 /* Copy the symbol's name into the string table. */ 552 sprintf (vars->string_ptr, "%s%s", prefix, symbol_name); 553 554 if (section == NULL) 555 section = bfd_und_section_ptr; 556 557 /* Initialise the external symbol. */ 558 H_PUT_32 (vars->abfd, vars->string_ptr - vars->string_table, 559 esym->e.e.e_offset); 560 H_PUT_16 (vars->abfd, section->target_index, esym->e_scnum); 561 esym->e_sclass[0] = sclass; 562 563 /* The following initialisations are unnecessary - the memory is 564 zero initialised. They are just kept here as reminders. */ 565 566 /* Initialise the internal symbol structure. */ 567 ent->u.syment.n_sclass = sclass; 568 ent->u.syment.n_scnum = section->target_index; 569 ent->u.syment._n._n_n._n_offset = (bfd_hostptr_t) sym; 570 571 sym->symbol.the_bfd = vars->abfd; 572 sym->symbol.name = vars->string_ptr; 573 sym->symbol.flags = BSF_EXPORT | BSF_GLOBAL | extra_flags; 574 sym->symbol.section = section; 575 sym->native = ent; 576 577 * vars->table_ptr = vars->sym_index; 578 * vars->sym_ptr_ptr = sym; 579 580 /* Adjust pointers for the next symbol. */ 581 vars->sym_index ++; 582 vars->sym_ptr ++; 583 vars->sym_ptr_ptr ++; 584 vars->table_ptr ++; 585 vars->native_ptr ++; 586 vars->esym_ptr ++; 587 vars->string_ptr += strlen (symbol_name) + strlen (prefix) + 1; 588 589 BFD_ASSERT (vars->string_ptr < vars->end_string_ptr); 590 } 591 592 /* Create a section. */ 593 594 static asection_ptr 595 pe_ILF_make_a_section (pe_ILF_vars * vars, 596 const char * name, 597 unsigned int size, 598 flagword extra_flags) 599 { 600 asection_ptr sec; 601 flagword flags; 602 603 sec = bfd_make_section_old_way (vars->abfd, name); 604 if (sec == NULL) 605 return NULL; 606 607 flags = SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_IN_MEMORY; 608 609 bfd_set_section_flags (vars->abfd, sec, flags | extra_flags); 610 611 (void) bfd_set_section_alignment (vars->abfd, sec, 2); 612 613 /* Check that we will not run out of space. */ 614 BFD_ASSERT (vars->data + size < vars->bim->buffer + vars->bim->size); 615 616 /* Set the section size and contents. The actual 617 contents are filled in by our parent. */ 618 bfd_set_section_size (vars->abfd, sec, (bfd_size_type) size); 619 sec->contents = vars->data; 620 sec->target_index = vars->sec_index ++; 621 622 /* Advance data pointer in the vars structure. */ 623 vars->data += size; 624 625 /* Skip the padding byte if it was not needed. 626 The logic here is that if the string length is odd, 627 then the entire string length, including the null byte, 628 is even and so the extra, padding byte, is not needed. */ 629 if (size & 1) 630 vars->data --; 631 632 /* Create a coff_section_tdata structure for our use. */ 633 sec->used_by_bfd = (struct coff_section_tdata *) vars->data; 634 vars->data += sizeof (struct coff_section_tdata); 635 636 BFD_ASSERT (vars->data <= vars->bim->buffer + vars->bim->size); 637 638 /* Create a symbol to refer to this section. */ 639 pe_ILF_make_a_symbol (vars, "", name, sec, BSF_LOCAL); 640 641 /* Cache the index to the symbol in the coff_section_data structure. */ 642 coff_section_data (vars->abfd, sec)->i = vars->sym_index - 1; 643 644 return sec; 645 } 646 647 /* This structure contains the code that goes into the .text section 648 in order to perform a jump into the DLL lookup table. The entries 649 in the table are index by the magic number used to represent the 650 machine type in the PE file. The contents of the data[] arrays in 651 these entries are stolen from the jtab[] arrays in ld/pe-dll.c. 652 The SIZE field says how many bytes in the DATA array are actually 653 used. The OFFSET field says where in the data array the address 654 of the .idata$5 section should be placed. */ 655 #define MAX_TEXT_SECTION_SIZE 32 656 657 typedef struct 658 { 659 unsigned short magic; 660 unsigned char data[MAX_TEXT_SECTION_SIZE]; 661 unsigned int size; 662 unsigned int offset; 663 } 664 jump_table; 665 666 static jump_table jtab[] = 667 { 668 #ifdef I386MAGIC 669 { I386MAGIC, 670 { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 }, 671 8, 2 672 }, 673 #endif 674 675 #ifdef AMD64MAGIC 676 { AMD64MAGIC, 677 { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 }, 678 8, 2 679 }, 680 #endif 681 682 #ifdef MC68MAGIC 683 { MC68MAGIC, 684 { /* XXX fill me in */ }, 685 0, 0 686 }, 687 #endif 688 689 #ifdef MIPS_ARCH_MAGIC_WINCE 690 { MIPS_ARCH_MAGIC_WINCE, 691 { 0x00, 0x00, 0x08, 0x3c, 0x00, 0x00, 0x08, 0x8d, 692 0x08, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00 }, 693 16, 0 694 }, 695 #endif 696 697 #ifdef SH_ARCH_MAGIC_WINCE 698 { SH_ARCH_MAGIC_WINCE, 699 { 0x01, 0xd0, 0x02, 0x60, 0x2b, 0x40, 700 0x09, 0x00, 0x00, 0x00, 0x00, 0x00 }, 701 12, 8 702 }, 703 #endif 704 705 #ifdef ARMPEMAGIC 706 { ARMPEMAGIC, 707 { 0x00, 0xc0, 0x9f, 0xe5, 0x00, 0xf0, 708 0x9c, 0xe5, 0x00, 0x00, 0x00, 0x00}, 709 12, 8 710 }, 711 #endif 712 713 #ifdef THUMBPEMAGIC 714 { THUMBPEMAGIC, 715 { 0x40, 0xb4, 0x02, 0x4e, 0x36, 0x68, 0xb4, 0x46, 716 0x40, 0xbc, 0x60, 0x47, 0x00, 0x00, 0x00, 0x00 }, 717 16, 12 718 }, 719 #endif 720 { 0, { 0 }, 0, 0 } 721 }; 722 723 #ifndef NUM_ENTRIES 724 #define NUM_ENTRIES(a) (sizeof (a) / sizeof (a)[0]) 725 #endif 726 727 /* Build a full BFD from the information supplied in a ILF object. */ 728 729 static bfd_boolean 730 pe_ILF_build_a_bfd (bfd * abfd, 731 unsigned int magic, 732 char * symbol_name, 733 char * source_dll, 734 unsigned int ordinal, 735 unsigned int types) 736 { 737 bfd_byte * ptr; 738 pe_ILF_vars vars; 739 struct internal_filehdr internal_f; 740 unsigned int import_type; 741 unsigned int import_name_type; 742 asection_ptr id4, id5, id6 = NULL, text = NULL; 743 coff_symbol_type ** imp_sym; 744 unsigned int imp_index; 745 746 /* Decode and verify the types field of the ILF structure. */ 747 import_type = types & 0x3; 748 import_name_type = (types & 0x1c) >> 2; 749 750 switch (import_type) 751 { 752 case IMPORT_CODE: 753 case IMPORT_DATA: 754 break; 755 756 case IMPORT_CONST: 757 /* XXX code yet to be written. */ 758 _bfd_error_handler (_("%B: Unhandled import type; %x"), 759 abfd, import_type); 760 return FALSE; 761 762 default: 763 _bfd_error_handler (_("%B: Unrecognised import type; %x"), 764 abfd, import_type); 765 return FALSE; 766 } 767 768 switch (import_name_type) 769 { 770 case IMPORT_ORDINAL: 771 case IMPORT_NAME: 772 case IMPORT_NAME_NOPREFIX: 773 case IMPORT_NAME_UNDECORATE: 774 break; 775 776 default: 777 _bfd_error_handler (_("%B: Unrecognised import name type; %x"), 778 abfd, import_name_type); 779 return FALSE; 780 } 781 782 /* Initialise local variables. 783 784 Note these are kept in a structure rather than being 785 declared as statics since bfd frowns on global variables. 786 787 We are going to construct the contents of the BFD in memory, 788 so allocate all the space that we will need right now. */ 789 vars.bim 790 = (struct bfd_in_memory *) bfd_malloc ((bfd_size_type) sizeof (*vars.bim)); 791 if (vars.bim == NULL) 792 return FALSE; 793 794 ptr = (bfd_byte *) bfd_zmalloc ((bfd_size_type) ILF_DATA_SIZE); 795 vars.bim->buffer = ptr; 796 vars.bim->size = ILF_DATA_SIZE; 797 if (ptr == NULL) 798 goto error_return; 799 800 /* Initialise the pointers to regions of the memory and the 801 other contents of the pe_ILF_vars structure as well. */ 802 vars.sym_cache = (coff_symbol_type *) ptr; 803 vars.sym_ptr = (coff_symbol_type *) ptr; 804 vars.sym_index = 0; 805 ptr += SIZEOF_ILF_SYMS; 806 807 vars.sym_table = (unsigned int *) ptr; 808 vars.table_ptr = (unsigned int *) ptr; 809 ptr += SIZEOF_ILF_SYM_TABLE; 810 811 vars.native_syms = (combined_entry_type *) ptr; 812 vars.native_ptr = (combined_entry_type *) ptr; 813 ptr += SIZEOF_ILF_NATIVE_SYMS; 814 815 vars.sym_ptr_table = (coff_symbol_type **) ptr; 816 vars.sym_ptr_ptr = (coff_symbol_type **) ptr; 817 ptr += SIZEOF_ILF_SYM_PTR_TABLE; 818 819 vars.esym_table = (SYMENT *) ptr; 820 vars.esym_ptr = (SYMENT *) ptr; 821 ptr += SIZEOF_ILF_EXT_SYMS; 822 823 vars.reltab = (arelent *) ptr; 824 vars.relcount = 0; 825 ptr += SIZEOF_ILF_RELOCS; 826 827 vars.int_reltab = (struct internal_reloc *) ptr; 828 ptr += SIZEOF_ILF_INT_RELOCS; 829 830 vars.string_table = (char *) ptr; 831 vars.string_ptr = (char *) ptr + STRING_SIZE_SIZE; 832 ptr += SIZEOF_ILF_STRINGS; 833 vars.end_string_ptr = (char *) ptr; 834 835 /* The remaining space in bim->buffer is used 836 by the pe_ILF_make_a_section() function. */ 837 vars.data = ptr; 838 vars.abfd = abfd; 839 vars.sec_index = 0; 840 vars.magic = magic; 841 842 /* Create the initial .idata$<n> sections: 843 [.idata$2: Import Directory Table -- not needed] 844 .idata$4: Import Lookup Table 845 .idata$5: Import Address Table 846 847 Note we do not create a .idata$3 section as this is 848 created for us by the linker script. */ 849 id4 = pe_ILF_make_a_section (& vars, ".idata$4", SIZEOF_IDATA4, 0); 850 id5 = pe_ILF_make_a_section (& vars, ".idata$5", SIZEOF_IDATA5, 0); 851 if (id4 == NULL || id5 == NULL) 852 goto error_return; 853 854 /* Fill in the contents of these sections. */ 855 if (import_name_type == IMPORT_ORDINAL) 856 { 857 if (ordinal == 0) 858 /* XXX - treat as IMPORT_NAME ??? */ 859 abort (); 860 861 #ifdef COFF_WITH_pex64 862 ((unsigned int *) id4->contents)[0] = ordinal; 863 ((unsigned int *) id4->contents)[1] = 0x80000000; 864 ((unsigned int *) id5->contents)[0] = ordinal; 865 ((unsigned int *) id5->contents)[1] = 0x80000000; 866 #else 867 * (unsigned int *) id4->contents = ordinal | 0x80000000; 868 * (unsigned int *) id5->contents = ordinal | 0x80000000; 869 #endif 870 } 871 else 872 { 873 char * symbol; 874 unsigned int len; 875 876 /* Create .idata$6 - the Hint Name Table. */ 877 id6 = pe_ILF_make_a_section (& vars, ".idata$6", SIZEOF_IDATA6, 0); 878 if (id6 == NULL) 879 goto error_return; 880 881 /* If necessary, trim the import symbol name. */ 882 symbol = symbol_name; 883 884 /* As used by MS compiler, '_', '@', and '?' are alternative 885 forms of USER_LABEL_PREFIX, with '?' for c++ mangled names, 886 '@' used for fastcall (in C), '_' everywhere else. Only one 887 of these is used for a symbol. We strip this leading char for 888 IMPORT_NAME_NOPREFIX and IMPORT_NAME_UNDECORATE as per the 889 PE COFF 6.0 spec (section 8.3, Import Name Type). */ 890 891 if (import_name_type != IMPORT_NAME) 892 { 893 char c = symbol[0]; 894 895 /* Check that we don't remove for targets with empty 896 USER_LABEL_PREFIX the leading underscore. */ 897 if ((c == '_' && abfd->xvec->symbol_leading_char != 0) 898 || c == '@' || c == '?') 899 symbol++; 900 } 901 902 len = strlen (symbol); 903 if (import_name_type == IMPORT_NAME_UNDECORATE) 904 { 905 /* Truncate at the first '@'. */ 906 char *at = strchr (symbol, '@'); 907 908 if (at != NULL) 909 len = at - symbol; 910 } 911 912 id6->contents[0] = ordinal & 0xff; 913 id6->contents[1] = ordinal >> 8; 914 915 memcpy ((char *) id6->contents + 2, symbol, len); 916 id6->contents[len + 2] = '\0'; 917 } 918 919 if (import_name_type != IMPORT_ORDINAL) 920 { 921 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_RVA, id6); 922 pe_ILF_save_relocs (&vars, id4); 923 924 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_RVA, id6); 925 pe_ILF_save_relocs (&vars, id5); 926 } 927 928 /* Create extra sections depending upon the type of import we are dealing with. */ 929 switch (import_type) 930 { 931 int i; 932 933 case IMPORT_CODE: 934 /* Create a .text section. 935 First we need to look up its contents in the jump table. */ 936 for (i = NUM_ENTRIES (jtab); i--;) 937 { 938 if (jtab[i].size == 0) 939 continue; 940 if (jtab[i].magic == magic) 941 break; 942 } 943 /* If we did not find a matching entry something is wrong. */ 944 if (i < 0) 945 abort (); 946 947 /* Create the .text section. */ 948 text = pe_ILF_make_a_section (& vars, ".text", jtab[i].size, SEC_CODE); 949 if (text == NULL) 950 goto error_return; 951 952 /* Copy in the jump code. */ 953 memcpy (text->contents, jtab[i].data, jtab[i].size); 954 955 /* Create an import symbol. */ 956 pe_ILF_make_a_symbol (& vars, "__imp_", symbol_name, id5, 0); 957 imp_sym = vars.sym_ptr_ptr - 1; 958 imp_index = vars.sym_index - 1; 959 960 /* Create a reloc for the data in the text section. */ 961 #ifdef MIPS_ARCH_MAGIC_WINCE 962 if (magic == MIPS_ARCH_MAGIC_WINCE) 963 { 964 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) 0, BFD_RELOC_HI16_S, 965 (struct bfd_symbol **) imp_sym, 966 imp_index); 967 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_LO16, text); 968 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) 4, BFD_RELOC_LO16, 969 (struct bfd_symbol **) imp_sym, 970 imp_index); 971 } 972 else 973 #endif 974 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) jtab[i].offset, 975 BFD_RELOC_32, (asymbol **) imp_sym, 976 imp_index); 977 978 pe_ILF_save_relocs (& vars, text); 979 break; 980 981 case IMPORT_DATA: 982 break; 983 984 default: 985 /* XXX code not yet written. */ 986 abort (); 987 } 988 989 /* Initialise the bfd. */ 990 memset (& internal_f, 0, sizeof (internal_f)); 991 992 internal_f.f_magic = magic; 993 internal_f.f_symptr = 0; 994 internal_f.f_nsyms = 0; 995 internal_f.f_flags = F_AR32WR | F_LNNO; /* XXX is this correct ? */ 996 997 if ( ! bfd_set_start_address (abfd, (bfd_vma) 0) 998 || ! bfd_coff_set_arch_mach_hook (abfd, & internal_f)) 999 goto error_return; 1000 1001 if (bfd_coff_mkobject_hook (abfd, (void *) & internal_f, NULL) == NULL) 1002 goto error_return; 1003 1004 coff_data (abfd)->pe = 1; 1005 #ifdef THUMBPEMAGIC 1006 if (vars.magic == THUMBPEMAGIC) 1007 /* Stop some linker warnings about thumb code not supporting interworking. */ 1008 coff_data (abfd)->flags |= F_INTERWORK | F_INTERWORK_SET; 1009 #endif 1010 1011 /* Switch from file contents to memory contents. */ 1012 bfd_cache_close (abfd); 1013 1014 abfd->iostream = (void *) vars.bim; 1015 abfd->flags |= BFD_IN_MEMORY /* | HAS_LOCALS */; 1016 abfd->iovec = &_bfd_memory_iovec; 1017 abfd->where = 0; 1018 abfd->origin = 0; 1019 obj_sym_filepos (abfd) = 0; 1020 1021 /* Now create a symbol describing the imported value. */ 1022 switch (import_type) 1023 { 1024 case IMPORT_CODE: 1025 pe_ILF_make_a_symbol (& vars, "", symbol_name, text, 1026 BSF_NOT_AT_END | BSF_FUNCTION); 1027 1028 /* Create an import symbol for the DLL, without the 1029 .dll suffix. */ 1030 ptr = (bfd_byte *) strrchr (source_dll, '.'); 1031 if (ptr) 1032 * ptr = 0; 1033 pe_ILF_make_a_symbol (& vars, "__IMPORT_DESCRIPTOR_", source_dll, NULL, 0); 1034 if (ptr) 1035 * ptr = '.'; 1036 break; 1037 1038 case IMPORT_DATA: 1039 /* Nothing to do here. */ 1040 break; 1041 1042 default: 1043 /* XXX code not yet written. */ 1044 abort (); 1045 } 1046 1047 /* Point the bfd at the symbol table. */ 1048 obj_symbols (abfd) = vars.sym_cache; 1049 bfd_get_symcount (abfd) = vars.sym_index; 1050 1051 obj_raw_syments (abfd) = vars.native_syms; 1052 obj_raw_syment_count (abfd) = vars.sym_index; 1053 1054 obj_coff_external_syms (abfd) = (void *) vars.esym_table; 1055 obj_coff_keep_syms (abfd) = TRUE; 1056 1057 obj_convert (abfd) = vars.sym_table; 1058 obj_conv_table_size (abfd) = vars.sym_index; 1059 1060 obj_coff_strings (abfd) = vars.string_table; 1061 obj_coff_keep_strings (abfd) = TRUE; 1062 1063 abfd->flags |= HAS_SYMS; 1064 1065 return TRUE; 1066 1067 error_return: 1068 if (vars.bim->buffer != NULL) 1069 free (vars.bim->buffer); 1070 free (vars.bim); 1071 return FALSE; 1072 } 1073 1074 /* We have detected a Image Library Format archive element. 1075 Decode the element and return the appropriate target. */ 1076 1077 static const bfd_target * 1078 pe_ILF_object_p (bfd * abfd) 1079 { 1080 bfd_byte buffer[16]; 1081 bfd_byte * ptr; 1082 char * symbol_name; 1083 char * source_dll; 1084 unsigned int machine; 1085 bfd_size_type size; 1086 unsigned int ordinal; 1087 unsigned int types; 1088 unsigned int magic; 1089 1090 /* Upon entry the first four buyes of the ILF header have 1091 already been read. Now read the rest of the header. */ 1092 if (bfd_bread (buffer, (bfd_size_type) 16, abfd) != 16) 1093 return NULL; 1094 1095 ptr = buffer; 1096 1097 /* We do not bother to check the version number. 1098 version = H_GET_16 (abfd, ptr); */ 1099 ptr += 2; 1100 1101 machine = H_GET_16 (abfd, ptr); 1102 ptr += 2; 1103 1104 /* Check that the machine type is recognised. */ 1105 magic = 0; 1106 1107 switch (machine) 1108 { 1109 case IMAGE_FILE_MACHINE_UNKNOWN: 1110 case IMAGE_FILE_MACHINE_ALPHA: 1111 case IMAGE_FILE_MACHINE_ALPHA64: 1112 case IMAGE_FILE_MACHINE_IA64: 1113 break; 1114 1115 case IMAGE_FILE_MACHINE_I386: 1116 #ifdef I386MAGIC 1117 magic = I386MAGIC; 1118 #endif 1119 break; 1120 1121 case IMAGE_FILE_MACHINE_AMD64: 1122 #ifdef AMD64MAGIC 1123 magic = AMD64MAGIC; 1124 #endif 1125 break; 1126 1127 case IMAGE_FILE_MACHINE_M68K: 1128 #ifdef MC68AGIC 1129 magic = MC68MAGIC; 1130 #endif 1131 break; 1132 1133 case IMAGE_FILE_MACHINE_R3000: 1134 case IMAGE_FILE_MACHINE_R4000: 1135 case IMAGE_FILE_MACHINE_R10000: 1136 1137 case IMAGE_FILE_MACHINE_MIPS16: 1138 case IMAGE_FILE_MACHINE_MIPSFPU: 1139 case IMAGE_FILE_MACHINE_MIPSFPU16: 1140 #ifdef MIPS_ARCH_MAGIC_WINCE 1141 magic = MIPS_ARCH_MAGIC_WINCE; 1142 #endif 1143 break; 1144 1145 case IMAGE_FILE_MACHINE_SH3: 1146 case IMAGE_FILE_MACHINE_SH4: 1147 #ifdef SH_ARCH_MAGIC_WINCE 1148 magic = SH_ARCH_MAGIC_WINCE; 1149 #endif 1150 break; 1151 1152 case IMAGE_FILE_MACHINE_ARM: 1153 #ifdef ARMPEMAGIC 1154 magic = ARMPEMAGIC; 1155 #endif 1156 break; 1157 1158 case IMAGE_FILE_MACHINE_THUMB: 1159 #ifdef THUMBPEMAGIC 1160 { 1161 extern const bfd_target TARGET_LITTLE_SYM; 1162 1163 if (abfd->xvec == & TARGET_LITTLE_SYM) 1164 magic = THUMBPEMAGIC; 1165 } 1166 #endif 1167 break; 1168 1169 case IMAGE_FILE_MACHINE_POWERPC: 1170 /* We no longer support PowerPC. */ 1171 default: 1172 _bfd_error_handler 1173 (_("%B: Unrecognised machine type (0x%x)" 1174 " in Import Library Format archive"), 1175 abfd, machine); 1176 bfd_set_error (bfd_error_malformed_archive); 1177 1178 return NULL; 1179 break; 1180 } 1181 1182 if (magic == 0) 1183 { 1184 _bfd_error_handler 1185 (_("%B: Recognised but unhandled machine type (0x%x)" 1186 " in Import Library Format archive"), 1187 abfd, machine); 1188 bfd_set_error (bfd_error_wrong_format); 1189 1190 return NULL; 1191 } 1192 1193 /* We do not bother to check the date. 1194 date = H_GET_32 (abfd, ptr); */ 1195 ptr += 4; 1196 1197 size = H_GET_32 (abfd, ptr); 1198 ptr += 4; 1199 1200 if (size == 0) 1201 { 1202 _bfd_error_handler 1203 (_("%B: size field is zero in Import Library Format header"), abfd); 1204 bfd_set_error (bfd_error_malformed_archive); 1205 1206 return NULL; 1207 } 1208 1209 ordinal = H_GET_16 (abfd, ptr); 1210 ptr += 2; 1211 1212 types = H_GET_16 (abfd, ptr); 1213 /* ptr += 2; */ 1214 1215 /* Now read in the two strings that follow. */ 1216 ptr = (bfd_byte *) bfd_alloc (abfd, size); 1217 if (ptr == NULL) 1218 return NULL; 1219 1220 if (bfd_bread (ptr, size, abfd) != size) 1221 { 1222 bfd_release (abfd, ptr); 1223 return NULL; 1224 } 1225 1226 symbol_name = (char *) ptr; 1227 source_dll = symbol_name + strlen (symbol_name) + 1; 1228 1229 /* Verify that the strings are null terminated. */ 1230 if (ptr[size - 1] != 0 1231 || (bfd_size_type) ((bfd_byte *) source_dll - ptr) >= size) 1232 { 1233 _bfd_error_handler 1234 (_("%B: string not null terminated in ILF object file."), abfd); 1235 bfd_set_error (bfd_error_malformed_archive); 1236 bfd_release (abfd, ptr); 1237 return NULL; 1238 } 1239 1240 /* Now construct the bfd. */ 1241 if (! pe_ILF_build_a_bfd (abfd, magic, symbol_name, 1242 source_dll, ordinal, types)) 1243 { 1244 bfd_release (abfd, ptr); 1245 return NULL; 1246 } 1247 1248 return abfd->xvec; 1249 } 1250 1251 static const bfd_target * 1252 pe_bfd_object_p (bfd * abfd) 1253 { 1254 bfd_byte buffer[4]; 1255 struct external_PEI_DOS_hdr dos_hdr; 1256 struct external_PEI_IMAGE_hdr image_hdr; 1257 struct internal_filehdr internal_f; 1258 struct internal_aouthdr internal_a; 1259 file_ptr opt_hdr_size; 1260 file_ptr offset; 1261 1262 /* Detect if this a Microsoft Import Library Format element. */ 1263 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 1264 || bfd_bread (buffer, (bfd_size_type) 4, abfd) != 4) 1265 { 1266 if (bfd_get_error () != bfd_error_system_call) 1267 bfd_set_error (bfd_error_wrong_format); 1268 return NULL; 1269 } 1270 1271 if (H_GET_32 (abfd, buffer) == 0xffff0000) 1272 return pe_ILF_object_p (abfd); 1273 1274 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 1275 || bfd_bread (&dos_hdr, (bfd_size_type) sizeof (dos_hdr), abfd) 1276 != sizeof (dos_hdr)) 1277 { 1278 if (bfd_get_error () != bfd_error_system_call) 1279 bfd_set_error (bfd_error_wrong_format); 1280 return NULL; 1281 } 1282 1283 /* There are really two magic numbers involved; the magic number 1284 that says this is a NT executable (PEI) and the magic number that 1285 determines the architecture. The former is DOSMAGIC, stored in 1286 the e_magic field. The latter is stored in the f_magic field. 1287 If the NT magic number isn't valid, the architecture magic number 1288 could be mimicked by some other field (specifically, the number 1289 of relocs in section 3). Since this routine can only be called 1290 correctly for a PEI file, check the e_magic number here, and, if 1291 it doesn't match, clobber the f_magic number so that we don't get 1292 a false match. */ 1293 if (H_GET_16 (abfd, dos_hdr.e_magic) != DOSMAGIC) 1294 { 1295 bfd_set_error (bfd_error_wrong_format); 1296 return NULL; 1297 } 1298 1299 offset = H_GET_32 (abfd, dos_hdr.e_lfanew); 1300 if (bfd_seek (abfd, offset, SEEK_SET) != 0 1301 || (bfd_bread (&image_hdr, (bfd_size_type) sizeof (image_hdr), abfd) 1302 != sizeof (image_hdr))) 1303 { 1304 if (bfd_get_error () != bfd_error_system_call) 1305 bfd_set_error (bfd_error_wrong_format); 1306 return NULL; 1307 } 1308 1309 if (H_GET_32 (abfd, image_hdr.nt_signature) != 0x4550) 1310 { 1311 bfd_set_error (bfd_error_wrong_format); 1312 return NULL; 1313 } 1314 1315 /* Swap file header, so that we get the location for calling 1316 real_object_p. */ 1317 bfd_coff_swap_filehdr_in (abfd, (PTR)&image_hdr, &internal_f); 1318 1319 if (! bfd_coff_bad_format_hook (abfd, &internal_f) 1320 || internal_f.f_opthdr > bfd_coff_aoutsz (abfd)) 1321 { 1322 bfd_set_error (bfd_error_wrong_format); 1323 return NULL; 1324 } 1325 1326 /* Read the optional header, which has variable size. */ 1327 opt_hdr_size = internal_f.f_opthdr; 1328 1329 if (opt_hdr_size != 0) 1330 { 1331 PTR opthdr; 1332 1333 opthdr = bfd_alloc (abfd, opt_hdr_size); 1334 if (opthdr == NULL) 1335 return NULL; 1336 if (bfd_bread (opthdr, opt_hdr_size, abfd) 1337 != (bfd_size_type) opt_hdr_size) 1338 return NULL; 1339 1340 bfd_coff_swap_aouthdr_in (abfd, opthdr, (PTR) & internal_a); 1341 } 1342 1343 return coff_real_object_p (abfd, internal_f.f_nscns, &internal_f, 1344 (opt_hdr_size != 0 1345 ? &internal_a 1346 : (struct internal_aouthdr *) NULL)); 1347 } 1348 1349 #define coff_object_p pe_bfd_object_p 1350 #endif /* COFF_IMAGE_WITH_PE */ 1351