1 /* Support for the generic parts of PE/PEI, for BFD. 2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 3 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 4 Free Software Foundation, Inc. 5 Written by Cygnus Solutions. 6 7 This file is part of BFD, the Binary File Descriptor library. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 22 MA 02110-1301, USA. */ 23 24 25 /* Most of this hacked by Steve Chamberlain, 26 sac@cygnus.com 27 28 PE/PEI rearrangement (and code added): Donn Terry 29 Softway Systems, Inc. */ 30 31 /* Hey look, some documentation [and in a place you expect to find it]! 32 33 The main reference for the pei format is "Microsoft Portable Executable 34 and Common Object File Format Specification 4.1". Get it if you need to 35 do some serious hacking on this code. 36 37 Another reference: 38 "Peering Inside the PE: A Tour of the Win32 Portable Executable 39 File Format", MSJ 1994, Volume 9. 40 41 The *sole* difference between the pe format and the pei format is that the 42 latter has an MSDOS 2.0 .exe header on the front that prints the message 43 "This app must be run under Windows." (or some such). 44 (FIXME: Whether that statement is *really* true or not is unknown. 45 Are there more subtle differences between pe and pei formats? 46 For now assume there aren't. If you find one, then for God sakes 47 document it here!) 48 49 The Microsoft docs use the word "image" instead of "executable" because 50 the former can also refer to a DLL (shared library). Confusion can arise 51 because the `i' in `pei' also refers to "image". The `pe' format can 52 also create images (i.e. executables), it's just that to run on a win32 53 system you need to use the pei format. 54 55 FIXME: Please add more docs here so the next poor fool that has to hack 56 on this code has a chance of getting something accomplished without 57 wasting too much time. */ 58 59 #include "libpei.h" 60 61 static bfd_boolean (*pe_saved_coff_bfd_print_private_bfd_data) (bfd *, void *) = 62 #ifndef coff_bfd_print_private_bfd_data 63 NULL; 64 #else 65 coff_bfd_print_private_bfd_data; 66 #undef coff_bfd_print_private_bfd_data 67 #endif 68 69 static bfd_boolean pe_print_private_bfd_data (bfd *, void *); 70 #define coff_bfd_print_private_bfd_data pe_print_private_bfd_data 71 72 static bfd_boolean (*pe_saved_coff_bfd_copy_private_bfd_data) (bfd *, bfd *) = 73 #ifndef coff_bfd_copy_private_bfd_data 74 NULL; 75 #else 76 coff_bfd_copy_private_bfd_data; 77 #undef coff_bfd_copy_private_bfd_data 78 #endif 79 80 static bfd_boolean pe_bfd_copy_private_bfd_data (bfd *, bfd *); 81 #define coff_bfd_copy_private_bfd_data pe_bfd_copy_private_bfd_data 82 83 #define coff_mkobject pe_mkobject 84 #define coff_mkobject_hook pe_mkobject_hook 85 86 #ifdef COFF_IMAGE_WITH_PE 87 /* This structure contains static variables used by the ILF code. */ 88 typedef asection * asection_ptr; 89 90 typedef struct 91 { 92 bfd * abfd; 93 bfd_byte * data; 94 struct bfd_in_memory * bim; 95 unsigned short magic; 96 97 arelent * reltab; 98 unsigned int relcount; 99 100 coff_symbol_type * sym_cache; 101 coff_symbol_type * sym_ptr; 102 unsigned int sym_index; 103 104 unsigned int * sym_table; 105 unsigned int * table_ptr; 106 107 combined_entry_type * native_syms; 108 combined_entry_type * native_ptr; 109 110 coff_symbol_type ** sym_ptr_table; 111 coff_symbol_type ** sym_ptr_ptr; 112 113 unsigned int sec_index; 114 115 char * string_table; 116 char * string_ptr; 117 char * end_string_ptr; 118 119 SYMENT * esym_table; 120 SYMENT * esym_ptr; 121 122 struct internal_reloc * int_reltab; 123 } 124 pe_ILF_vars; 125 #endif /* COFF_IMAGE_WITH_PE */ 126 127 #ifndef NO_COFF_RELOCS 128 static void 129 coff_swap_reloc_in (bfd * abfd, void * src, void * dst) 130 { 131 RELOC *reloc_src = (RELOC *) src; 132 struct internal_reloc *reloc_dst = (struct internal_reloc *) dst; 133 134 reloc_dst->r_vaddr = H_GET_32 (abfd, reloc_src->r_vaddr); 135 reloc_dst->r_symndx = H_GET_S32 (abfd, reloc_src->r_symndx); 136 reloc_dst->r_type = H_GET_16 (abfd, reloc_src->r_type); 137 #ifdef SWAP_IN_RELOC_OFFSET 138 reloc_dst->r_offset = SWAP_IN_RELOC_OFFSET (abfd, reloc_src->r_offset); 139 #endif 140 } 141 142 static unsigned int 143 coff_swap_reloc_out (bfd * abfd, void * src, void * dst) 144 { 145 struct internal_reloc *reloc_src = (struct internal_reloc *) src; 146 struct external_reloc *reloc_dst = (struct external_reloc *) dst; 147 148 H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr); 149 H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx); 150 H_PUT_16 (abfd, reloc_src->r_type, reloc_dst->r_type); 151 152 #ifdef SWAP_OUT_RELOC_OFFSET 153 SWAP_OUT_RELOC_OFFSET (abfd, reloc_src->r_offset, reloc_dst->r_offset); 154 #endif 155 #ifdef SWAP_OUT_RELOC_EXTRA 156 SWAP_OUT_RELOC_EXTRA (abfd, reloc_src, reloc_dst); 157 #endif 158 return RELSZ; 159 } 160 #endif /* not NO_COFF_RELOCS */ 161 162 static void 163 coff_swap_filehdr_in (bfd * abfd, void * src, void * dst) 164 { 165 FILHDR *filehdr_src = (FILHDR *) src; 166 struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst; 167 168 filehdr_dst->f_magic = H_GET_16 (abfd, filehdr_src->f_magic); 169 filehdr_dst->f_nscns = H_GET_16 (abfd, filehdr_src->f_nscns); 170 filehdr_dst->f_timdat = H_GET_32 (abfd, filehdr_src->f_timdat); 171 filehdr_dst->f_nsyms = H_GET_32 (abfd, filehdr_src->f_nsyms); 172 filehdr_dst->f_flags = H_GET_16 (abfd, filehdr_src->f_flags); 173 filehdr_dst->f_symptr = H_GET_32 (abfd, filehdr_src->f_symptr); 174 175 /* Other people's tools sometimes generate headers with an nsyms but 176 a zero symptr. */ 177 if (filehdr_dst->f_nsyms != 0 && filehdr_dst->f_symptr == 0) 178 { 179 filehdr_dst->f_nsyms = 0; 180 filehdr_dst->f_flags |= F_LSYMS; 181 } 182 183 filehdr_dst->f_opthdr = H_GET_16 (abfd, filehdr_src-> f_opthdr); 184 } 185 186 #ifdef COFF_IMAGE_WITH_PE 187 # define coff_swap_filehdr_out _bfd_XXi_only_swap_filehdr_out 188 #elif defined COFF_WITH_pex64 189 # define coff_swap_filehdr_out _bfd_pex64_only_swap_filehdr_out 190 #elif defined COFF_WITH_pep 191 # define coff_swap_filehdr_out _bfd_pep_only_swap_filehdr_out 192 #else 193 # define coff_swap_filehdr_out _bfd_pe_only_swap_filehdr_out 194 #endif 195 196 static void 197 coff_swap_scnhdr_in (bfd * abfd, void * ext, void * in) 198 { 199 SCNHDR *scnhdr_ext = (SCNHDR *) ext; 200 struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; 201 202 memcpy (scnhdr_int->s_name, scnhdr_ext->s_name, sizeof (scnhdr_int->s_name)); 203 204 scnhdr_int->s_vaddr = GET_SCNHDR_VADDR (abfd, scnhdr_ext->s_vaddr); 205 scnhdr_int->s_paddr = GET_SCNHDR_PADDR (abfd, scnhdr_ext->s_paddr); 206 scnhdr_int->s_size = GET_SCNHDR_SIZE (abfd, scnhdr_ext->s_size); 207 scnhdr_int->s_scnptr = GET_SCNHDR_SCNPTR (abfd, scnhdr_ext->s_scnptr); 208 scnhdr_int->s_relptr = GET_SCNHDR_RELPTR (abfd, scnhdr_ext->s_relptr); 209 scnhdr_int->s_lnnoptr = GET_SCNHDR_LNNOPTR (abfd, scnhdr_ext->s_lnnoptr); 210 scnhdr_int->s_flags = H_GET_32 (abfd, scnhdr_ext->s_flags); 211 212 /* MS handles overflow of line numbers by carrying into the reloc 213 field (it appears). Since it's supposed to be zero for PE 214 *IMAGE* format, that's safe. This is still a bit iffy. */ 215 #ifdef COFF_IMAGE_WITH_PE 216 scnhdr_int->s_nlnno = (H_GET_16 (abfd, scnhdr_ext->s_nlnno) 217 + (H_GET_16 (abfd, scnhdr_ext->s_nreloc) << 16)); 218 scnhdr_int->s_nreloc = 0; 219 #else 220 scnhdr_int->s_nreloc = H_GET_16 (abfd, scnhdr_ext->s_nreloc); 221 scnhdr_int->s_nlnno = H_GET_16 (abfd, scnhdr_ext->s_nlnno); 222 #endif 223 224 if (scnhdr_int->s_vaddr != 0) 225 { 226 scnhdr_int->s_vaddr += pe_data (abfd)->pe_opthdr.ImageBase; 227 /* Do not cut upper 32-bits for 64-bit vma. */ 228 #ifndef COFF_WITH_pex64 229 scnhdr_int->s_vaddr &= 0xffffffff; 230 #endif 231 } 232 233 #ifndef COFF_NO_HACK_SCNHDR_SIZE 234 /* If this section holds uninitialized data and is from an object file 235 or from an executable image that has not initialized the field, 236 or if the image is an executable file and the physical size is padded, 237 use the virtual size (stored in s_paddr) instead. */ 238 if (scnhdr_int->s_paddr > 0 239 && (((scnhdr_int->s_flags & IMAGE_SCN_CNT_UNINITIALIZED_DATA) != 0 240 && (! bfd_pei_p (abfd) || scnhdr_int->s_size == 0)) 241 || (bfd_pei_p (abfd) && (scnhdr_int->s_size > scnhdr_int->s_paddr)))) 242 /* This code used to set scnhdr_int->s_paddr to 0. However, 243 coff_set_alignment_hook stores s_paddr in virt_size, which 244 only works if it correctly holds the virtual size of the 245 section. */ 246 scnhdr_int->s_size = scnhdr_int->s_paddr; 247 #endif 248 } 249 250 static bfd_boolean 251 pe_mkobject (bfd * abfd) 252 { 253 pe_data_type *pe; 254 bfd_size_type amt = sizeof (pe_data_type); 255 256 abfd->tdata.pe_obj_data = (struct pe_tdata *) bfd_zalloc (abfd, amt); 257 258 if (abfd->tdata.pe_obj_data == 0) 259 return FALSE; 260 261 pe = pe_data (abfd); 262 263 pe->coff.pe = 1; 264 265 /* in_reloc_p is architecture dependent. */ 266 pe->in_reloc_p = in_reloc_p; 267 268 return TRUE; 269 } 270 271 /* Create the COFF backend specific information. */ 272 273 static void * 274 pe_mkobject_hook (bfd * abfd, 275 void * filehdr, 276 void * aouthdr ATTRIBUTE_UNUSED) 277 { 278 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr; 279 pe_data_type *pe; 280 281 if (! pe_mkobject (abfd)) 282 return NULL; 283 284 pe = pe_data (abfd); 285 pe->coff.sym_filepos = internal_f->f_symptr; 286 /* These members communicate important constants about the symbol 287 table to GDB's symbol-reading code. These `constants' 288 unfortunately vary among coff implementations... */ 289 pe->coff.local_n_btmask = N_BTMASK; 290 pe->coff.local_n_btshft = N_BTSHFT; 291 pe->coff.local_n_tmask = N_TMASK; 292 pe->coff.local_n_tshift = N_TSHIFT; 293 pe->coff.local_symesz = SYMESZ; 294 pe->coff.local_auxesz = AUXESZ; 295 pe->coff.local_linesz = LINESZ; 296 297 pe->coff.timestamp = internal_f->f_timdat; 298 299 obj_raw_syment_count (abfd) = 300 obj_conv_table_size (abfd) = 301 internal_f->f_nsyms; 302 303 pe->real_flags = internal_f->f_flags; 304 305 if ((internal_f->f_flags & F_DLL) != 0) 306 pe->dll = 1; 307 308 if ((internal_f->f_flags & IMAGE_FILE_DEBUG_STRIPPED) == 0) 309 abfd->flags |= HAS_DEBUG; 310 311 #ifdef COFF_IMAGE_WITH_PE 312 if (aouthdr) 313 pe->pe_opthdr = ((struct internal_aouthdr *) aouthdr)->pe; 314 #endif 315 316 #ifdef ARM 317 if (! _bfd_coff_arm_set_private_flags (abfd, internal_f->f_flags)) 318 coff_data (abfd) ->flags = 0; 319 #endif 320 321 return (void *) pe; 322 } 323 324 static bfd_boolean 325 pe_print_private_bfd_data (bfd *abfd, void * vfile) 326 { 327 FILE *file = (FILE *) vfile; 328 329 if (!_bfd_XX_print_private_bfd_data_common (abfd, vfile)) 330 return FALSE; 331 332 if (pe_saved_coff_bfd_print_private_bfd_data == NULL) 333 return TRUE; 334 335 fputc ('\n', file); 336 337 return pe_saved_coff_bfd_print_private_bfd_data (abfd, vfile); 338 } 339 340 /* Copy any private info we understand from the input bfd 341 to the output bfd. */ 342 343 static bfd_boolean 344 pe_bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 345 { 346 /* PR binutils/716: Copy the large address aware flag. 347 XXX: Should we be copying other flags or other fields in the pe_data() 348 structure ? */ 349 if (pe_data (obfd) != NULL 350 && pe_data (ibfd) != NULL 351 && pe_data (ibfd)->real_flags & IMAGE_FILE_LARGE_ADDRESS_AWARE) 352 pe_data (obfd)->real_flags |= IMAGE_FILE_LARGE_ADDRESS_AWARE; 353 354 if (!_bfd_XX_bfd_copy_private_bfd_data_common (ibfd, obfd)) 355 return FALSE; 356 357 if (pe_saved_coff_bfd_copy_private_bfd_data) 358 return pe_saved_coff_bfd_copy_private_bfd_data (ibfd, obfd); 359 360 return TRUE; 361 } 362 363 #define coff_bfd_copy_private_section_data \ 364 _bfd_XX_bfd_copy_private_section_data 365 366 #define coff_get_symbol_info _bfd_XX_get_symbol_info 367 368 #ifdef COFF_IMAGE_WITH_PE 369 370 /* Code to handle Microsoft's Image Library Format. 371 Also known as LINK6 format. 372 Documentation about this format can be found at: 373 374 http://msdn.microsoft.com/library/specs/pecoff_section8.htm */ 375 376 /* The following constants specify the sizes of the various data 377 structures that we have to create in order to build a bfd describing 378 an ILF object file. The final "+ 1" in the definitions of SIZEOF_IDATA6 379 and SIZEOF_IDATA7 below is to allow for the possibility that we might 380 need a padding byte in order to ensure 16 bit alignment for the section's 381 contents. 382 383 The value for SIZEOF_ILF_STRINGS is computed as follows: 384 385 There will be NUM_ILF_SECTIONS section symbols. Allow 9 characters 386 per symbol for their names (longest section name is .idata$x). 387 388 There will be two symbols for the imported value, one the symbol name 389 and one with _imp__ prefixed. Allowing for the terminating nul's this 390 is strlen (symbol_name) * 2 + 8 + 21 + strlen (source_dll). 391 392 The strings in the string table must start STRING__SIZE_SIZE bytes into 393 the table in order to for the string lookup code in coffgen/coffcode to 394 work. */ 395 #define NUM_ILF_RELOCS 8 396 #define NUM_ILF_SECTIONS 6 397 #define NUM_ILF_SYMS (2 + NUM_ILF_SECTIONS) 398 399 #define SIZEOF_ILF_SYMS (NUM_ILF_SYMS * sizeof (* vars.sym_cache)) 400 #define SIZEOF_ILF_SYM_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_table)) 401 #define SIZEOF_ILF_NATIVE_SYMS (NUM_ILF_SYMS * sizeof (* vars.native_syms)) 402 #define SIZEOF_ILF_SYM_PTR_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_ptr_table)) 403 #define SIZEOF_ILF_EXT_SYMS (NUM_ILF_SYMS * sizeof (* vars.esym_table)) 404 #define SIZEOF_ILF_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.reltab)) 405 #define SIZEOF_ILF_INT_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.int_reltab)) 406 #define SIZEOF_ILF_STRINGS (strlen (symbol_name) * 2 + 8 \ 407 + 21 + strlen (source_dll) \ 408 + NUM_ILF_SECTIONS * 9 \ 409 + STRING_SIZE_SIZE) 410 #define SIZEOF_IDATA2 (5 * 4) 411 412 /* For PEx64 idata4 & 5 have thumb size of 8 bytes. */ 413 #ifdef COFF_WITH_pex64 414 #define SIZEOF_IDATA4 (2 * 4) 415 #define SIZEOF_IDATA5 (2 * 4) 416 #else 417 #define SIZEOF_IDATA4 (1 * 4) 418 #define SIZEOF_IDATA5 (1 * 4) 419 #endif 420 421 #define SIZEOF_IDATA6 (2 + strlen (symbol_name) + 1 + 1) 422 #define SIZEOF_IDATA7 (strlen (source_dll) + 1 + 1) 423 #define SIZEOF_ILF_SECTIONS (NUM_ILF_SECTIONS * sizeof (struct coff_section_tdata)) 424 425 #define ILF_DATA_SIZE \ 426 + SIZEOF_ILF_SYMS \ 427 + SIZEOF_ILF_SYM_TABLE \ 428 + SIZEOF_ILF_NATIVE_SYMS \ 429 + SIZEOF_ILF_SYM_PTR_TABLE \ 430 + SIZEOF_ILF_EXT_SYMS \ 431 + SIZEOF_ILF_RELOCS \ 432 + SIZEOF_ILF_INT_RELOCS \ 433 + SIZEOF_ILF_STRINGS \ 434 + SIZEOF_IDATA2 \ 435 + SIZEOF_IDATA4 \ 436 + SIZEOF_IDATA5 \ 437 + SIZEOF_IDATA6 \ 438 + SIZEOF_IDATA7 \ 439 + SIZEOF_ILF_SECTIONS \ 440 + MAX_TEXT_SECTION_SIZE 441 442 /* Create an empty relocation against the given symbol. */ 443 444 static void 445 pe_ILF_make_a_symbol_reloc (pe_ILF_vars * vars, 446 bfd_vma address, 447 bfd_reloc_code_real_type reloc, 448 struct bfd_symbol ** sym, 449 unsigned int sym_index) 450 { 451 arelent * entry; 452 struct internal_reloc * internal; 453 454 entry = vars->reltab + vars->relcount; 455 internal = vars->int_reltab + vars->relcount; 456 457 entry->address = address; 458 entry->addend = 0; 459 entry->howto = bfd_reloc_type_lookup (vars->abfd, reloc); 460 entry->sym_ptr_ptr = sym; 461 462 internal->r_vaddr = address; 463 internal->r_symndx = sym_index; 464 internal->r_type = entry->howto->type; 465 466 vars->relcount ++; 467 468 BFD_ASSERT (vars->relcount <= NUM_ILF_RELOCS); 469 } 470 471 /* Create an empty relocation against the given section. */ 472 473 static void 474 pe_ILF_make_a_reloc (pe_ILF_vars * vars, 475 bfd_vma address, 476 bfd_reloc_code_real_type reloc, 477 asection_ptr sec) 478 { 479 pe_ILF_make_a_symbol_reloc (vars, address, reloc, sec->symbol_ptr_ptr, 480 coff_section_data (vars->abfd, sec)->i); 481 } 482 483 /* Move the queued relocs into the given section. */ 484 485 static void 486 pe_ILF_save_relocs (pe_ILF_vars * vars, 487 asection_ptr sec) 488 { 489 /* Make sure that there is somewhere to store the internal relocs. */ 490 if (coff_section_data (vars->abfd, sec) == NULL) 491 /* We should probably return an error indication here. */ 492 abort (); 493 494 coff_section_data (vars->abfd, sec)->relocs = vars->int_reltab; 495 coff_section_data (vars->abfd, sec)->keep_relocs = TRUE; 496 497 sec->relocation = vars->reltab; 498 sec->reloc_count = vars->relcount; 499 sec->flags |= SEC_RELOC; 500 501 vars->reltab += vars->relcount; 502 vars->int_reltab += vars->relcount; 503 vars->relcount = 0; 504 505 BFD_ASSERT ((bfd_byte *) vars->int_reltab < (bfd_byte *) vars->string_table); 506 } 507 508 /* Create a global symbol and add it to the relevant tables. */ 509 510 static void 511 pe_ILF_make_a_symbol (pe_ILF_vars * vars, 512 const char * prefix, 513 const char * symbol_name, 514 asection_ptr section, 515 flagword extra_flags) 516 { 517 coff_symbol_type * sym; 518 combined_entry_type * ent; 519 SYMENT * esym; 520 unsigned short sclass; 521 522 if (extra_flags & BSF_LOCAL) 523 sclass = C_STAT; 524 else 525 sclass = C_EXT; 526 527 #ifdef THUMBPEMAGIC 528 if (vars->magic == THUMBPEMAGIC) 529 { 530 if (extra_flags & BSF_FUNCTION) 531 sclass = C_THUMBEXTFUNC; 532 else if (extra_flags & BSF_LOCAL) 533 sclass = C_THUMBSTAT; 534 else 535 sclass = C_THUMBEXT; 536 } 537 #endif 538 539 BFD_ASSERT (vars->sym_index < NUM_ILF_SYMS); 540 541 sym = vars->sym_ptr; 542 ent = vars->native_ptr; 543 esym = vars->esym_ptr; 544 545 /* Copy the symbol's name into the string table. */ 546 sprintf (vars->string_ptr, "%s%s", prefix, symbol_name); 547 548 if (section == NULL) 549 section = bfd_und_section_ptr; 550 551 /* Initialise the external symbol. */ 552 H_PUT_32 (vars->abfd, vars->string_ptr - vars->string_table, 553 esym->e.e.e_offset); 554 H_PUT_16 (vars->abfd, section->target_index, esym->e_scnum); 555 esym->e_sclass[0] = sclass; 556 557 /* The following initialisations are unnecessary - the memory is 558 zero initialised. They are just kept here as reminders. */ 559 560 /* Initialise the internal symbol structure. */ 561 ent->u.syment.n_sclass = sclass; 562 ent->u.syment.n_scnum = section->target_index; 563 ent->u.syment._n._n_n._n_offset = (bfd_hostptr_t) sym; 564 565 sym->symbol.the_bfd = vars->abfd; 566 sym->symbol.name = vars->string_ptr; 567 sym->symbol.flags = BSF_EXPORT | BSF_GLOBAL | extra_flags; 568 sym->symbol.section = section; 569 sym->native = ent; 570 571 * vars->table_ptr = vars->sym_index; 572 * vars->sym_ptr_ptr = sym; 573 574 /* Adjust pointers for the next symbol. */ 575 vars->sym_index ++; 576 vars->sym_ptr ++; 577 vars->sym_ptr_ptr ++; 578 vars->table_ptr ++; 579 vars->native_ptr ++; 580 vars->esym_ptr ++; 581 vars->string_ptr += strlen (symbol_name) + strlen (prefix) + 1; 582 583 BFD_ASSERT (vars->string_ptr < vars->end_string_ptr); 584 } 585 586 /* Create a section. */ 587 588 static asection_ptr 589 pe_ILF_make_a_section (pe_ILF_vars * vars, 590 const char * name, 591 unsigned int size, 592 flagword extra_flags) 593 { 594 asection_ptr sec; 595 flagword flags; 596 597 sec = bfd_make_section_old_way (vars->abfd, name); 598 if (sec == NULL) 599 return NULL; 600 601 flags = SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_IN_MEMORY; 602 603 bfd_set_section_flags (vars->abfd, sec, flags | extra_flags); 604 605 bfd_set_section_alignment (vars->abfd, sec, 2); 606 607 /* Check that we will not run out of space. */ 608 BFD_ASSERT (vars->data + size < vars->bim->buffer + vars->bim->size); 609 610 /* Set the section size and contents. The actual 611 contents are filled in by our parent. */ 612 bfd_set_section_size (vars->abfd, sec, (bfd_size_type) size); 613 sec->contents = vars->data; 614 sec->target_index = vars->sec_index ++; 615 616 /* Advance data pointer in the vars structure. */ 617 vars->data += size; 618 619 /* Skip the padding byte if it was not needed. 620 The logic here is that if the string length is odd, 621 then the entire string length, including the null byte, 622 is even and so the extra, padding byte, is not needed. */ 623 if (size & 1) 624 vars->data --; 625 626 /* Create a coff_section_tdata structure for our use. */ 627 sec->used_by_bfd = (struct coff_section_tdata *) vars->data; 628 vars->data += sizeof (struct coff_section_tdata); 629 630 BFD_ASSERT (vars->data <= vars->bim->buffer + vars->bim->size); 631 632 /* Create a symbol to refer to this section. */ 633 pe_ILF_make_a_symbol (vars, "", name, sec, BSF_LOCAL); 634 635 /* Cache the index to the symbol in the coff_section_data structure. */ 636 coff_section_data (vars->abfd, sec)->i = vars->sym_index - 1; 637 638 return sec; 639 } 640 641 /* This structure contains the code that goes into the .text section 642 in order to perform a jump into the DLL lookup table. The entries 643 in the table are index by the magic number used to represent the 644 machine type in the PE file. The contents of the data[] arrays in 645 these entries are stolen from the jtab[] arrays in ld/pe-dll.c. 646 The SIZE field says how many bytes in the DATA array are actually 647 used. The OFFSET field says where in the data array the address 648 of the .idata$5 section should be placed. */ 649 #define MAX_TEXT_SECTION_SIZE 32 650 651 typedef struct 652 { 653 unsigned short magic; 654 unsigned char data[MAX_TEXT_SECTION_SIZE]; 655 unsigned int size; 656 unsigned int offset; 657 } 658 jump_table; 659 660 static jump_table jtab[] = 661 { 662 #ifdef I386MAGIC 663 { I386MAGIC, 664 { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 }, 665 8, 2 666 }, 667 #endif 668 669 #ifdef AMD64MAGIC 670 { AMD64MAGIC, 671 { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 }, 672 8, 2 673 }, 674 #endif 675 676 #ifdef MC68MAGIC 677 { MC68MAGIC, 678 { /* XXX fill me in */ }, 679 0, 0 680 }, 681 #endif 682 683 #ifdef MIPS_ARCH_MAGIC_WINCE 684 { MIPS_ARCH_MAGIC_WINCE, 685 { 0x00, 0x00, 0x08, 0x3c, 0x00, 0x00, 0x08, 0x8d, 686 0x08, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00 }, 687 16, 0 688 }, 689 #endif 690 691 #ifdef SH_ARCH_MAGIC_WINCE 692 { SH_ARCH_MAGIC_WINCE, 693 { 0x01, 0xd0, 0x02, 0x60, 0x2b, 0x40, 694 0x09, 0x00, 0x00, 0x00, 0x00, 0x00 }, 695 12, 8 696 }, 697 #endif 698 699 #ifdef ARMPEMAGIC 700 { ARMPEMAGIC, 701 { 0x00, 0xc0, 0x9f, 0xe5, 0x00, 0xf0, 702 0x9c, 0xe5, 0x00, 0x00, 0x00, 0x00}, 703 12, 8 704 }, 705 #endif 706 707 #ifdef THUMBPEMAGIC 708 { THUMBPEMAGIC, 709 { 0x40, 0xb4, 0x02, 0x4e, 0x36, 0x68, 0xb4, 0x46, 710 0x40, 0xbc, 0x60, 0x47, 0x00, 0x00, 0x00, 0x00 }, 711 16, 12 712 }, 713 #endif 714 { 0, { 0 }, 0, 0 } 715 }; 716 717 #ifndef NUM_ENTRIES 718 #define NUM_ENTRIES(a) (sizeof (a) / sizeof (a)[0]) 719 #endif 720 721 /* Build a full BFD from the information supplied in a ILF object. */ 722 723 static bfd_boolean 724 pe_ILF_build_a_bfd (bfd * abfd, 725 unsigned int magic, 726 char * symbol_name, 727 char * source_dll, 728 unsigned int ordinal, 729 unsigned int types) 730 { 731 bfd_byte * ptr; 732 pe_ILF_vars vars; 733 struct internal_filehdr internal_f; 734 unsigned int import_type; 735 unsigned int import_name_type; 736 asection_ptr id4, id5, id6 = NULL, text = NULL; 737 coff_symbol_type ** imp_sym; 738 unsigned int imp_index; 739 740 /* Decode and verify the types field of the ILF structure. */ 741 import_type = types & 0x3; 742 import_name_type = (types & 0x1c) >> 2; 743 744 switch (import_type) 745 { 746 case IMPORT_CODE: 747 case IMPORT_DATA: 748 break; 749 750 case IMPORT_CONST: 751 /* XXX code yet to be written. */ 752 _bfd_error_handler (_("%B: Unhandled import type; %x"), 753 abfd, import_type); 754 return FALSE; 755 756 default: 757 _bfd_error_handler (_("%B: Unrecognised import type; %x"), 758 abfd, import_type); 759 return FALSE; 760 } 761 762 switch (import_name_type) 763 { 764 case IMPORT_ORDINAL: 765 case IMPORT_NAME: 766 case IMPORT_NAME_NOPREFIX: 767 case IMPORT_NAME_UNDECORATE: 768 break; 769 770 default: 771 _bfd_error_handler (_("%B: Unrecognised import name type; %x"), 772 abfd, import_name_type); 773 return FALSE; 774 } 775 776 /* Initialise local variables. 777 778 Note these are kept in a structure rather than being 779 declared as statics since bfd frowns on global variables. 780 781 We are going to construct the contents of the BFD in memory, 782 so allocate all the space that we will need right now. */ 783 vars.bim 784 = (struct bfd_in_memory *) bfd_malloc ((bfd_size_type) sizeof (*vars.bim)); 785 if (vars.bim == NULL) 786 return FALSE; 787 788 ptr = (bfd_byte *) bfd_zmalloc ((bfd_size_type) ILF_DATA_SIZE); 789 vars.bim->buffer = ptr; 790 vars.bim->size = ILF_DATA_SIZE; 791 if (ptr == NULL) 792 goto error_return; 793 794 /* Initialise the pointers to regions of the memory and the 795 other contents of the pe_ILF_vars structure as well. */ 796 vars.sym_cache = (coff_symbol_type *) ptr; 797 vars.sym_ptr = (coff_symbol_type *) ptr; 798 vars.sym_index = 0; 799 ptr += SIZEOF_ILF_SYMS; 800 801 vars.sym_table = (unsigned int *) ptr; 802 vars.table_ptr = (unsigned int *) ptr; 803 ptr += SIZEOF_ILF_SYM_TABLE; 804 805 vars.native_syms = (combined_entry_type *) ptr; 806 vars.native_ptr = (combined_entry_type *) ptr; 807 ptr += SIZEOF_ILF_NATIVE_SYMS; 808 809 vars.sym_ptr_table = (coff_symbol_type **) ptr; 810 vars.sym_ptr_ptr = (coff_symbol_type **) ptr; 811 ptr += SIZEOF_ILF_SYM_PTR_TABLE; 812 813 vars.esym_table = (SYMENT *) ptr; 814 vars.esym_ptr = (SYMENT *) ptr; 815 ptr += SIZEOF_ILF_EXT_SYMS; 816 817 vars.reltab = (arelent *) ptr; 818 vars.relcount = 0; 819 ptr += SIZEOF_ILF_RELOCS; 820 821 vars.int_reltab = (struct internal_reloc *) ptr; 822 ptr += SIZEOF_ILF_INT_RELOCS; 823 824 vars.string_table = (char *) ptr; 825 vars.string_ptr = (char *) ptr + STRING_SIZE_SIZE; 826 ptr += SIZEOF_ILF_STRINGS; 827 vars.end_string_ptr = (char *) ptr; 828 829 /* The remaining space in bim->buffer is used 830 by the pe_ILF_make_a_section() function. */ 831 vars.data = ptr; 832 vars.abfd = abfd; 833 vars.sec_index = 0; 834 vars.magic = magic; 835 836 /* Create the initial .idata$<n> sections: 837 [.idata$2: Import Directory Table -- not needed] 838 .idata$4: Import Lookup Table 839 .idata$5: Import Address Table 840 841 Note we do not create a .idata$3 section as this is 842 created for us by the linker script. */ 843 id4 = pe_ILF_make_a_section (& vars, ".idata$4", SIZEOF_IDATA4, 0); 844 id5 = pe_ILF_make_a_section (& vars, ".idata$5", SIZEOF_IDATA5, 0); 845 if (id4 == NULL || id5 == NULL) 846 goto error_return; 847 848 /* Fill in the contents of these sections. */ 849 if (import_name_type == IMPORT_ORDINAL) 850 { 851 if (ordinal == 0) 852 /* XXX - treat as IMPORT_NAME ??? */ 853 abort (); 854 855 #ifdef COFF_WITH_pex64 856 ((unsigned int *) id4->contents)[0] = ordinal; 857 ((unsigned int *) id4->contents)[1] = 0x80000000; 858 ((unsigned int *) id5->contents)[0] = ordinal; 859 ((unsigned int *) id5->contents)[1] = 0x80000000; 860 #else 861 * (unsigned int *) id4->contents = ordinal | 0x80000000; 862 * (unsigned int *) id5->contents = ordinal | 0x80000000; 863 #endif 864 } 865 else 866 { 867 char * symbol; 868 unsigned int len; 869 870 /* Create .idata$6 - the Hint Name Table. */ 871 id6 = pe_ILF_make_a_section (& vars, ".idata$6", SIZEOF_IDATA6, 0); 872 if (id6 == NULL) 873 goto error_return; 874 875 /* If necessary, trim the import symbol name. */ 876 symbol = symbol_name; 877 878 /* As used by MS compiler, '_', '@', and '?' are alternative 879 forms of USER_LABEL_PREFIX, with '?' for c++ mangled names, 880 '@' used for fastcall (in C), '_' everywhere else. Only one 881 of these is used for a symbol. We strip this leading char for 882 IMPORT_NAME_NOPREFIX and IMPORT_NAME_UNDECORATE as per the 883 PE COFF 6.0 spec (section 8.3, Import Name Type). */ 884 885 if (import_name_type != IMPORT_NAME) 886 { 887 char c = symbol[0]; 888 889 /* Check that we don't remove for targets with empty 890 USER_LABEL_PREFIX the leading underscore. */ 891 if ((c == '_' && abfd->xvec->symbol_leading_char != 0) 892 || c == '@' || c == '?') 893 symbol++; 894 } 895 896 len = strlen (symbol); 897 if (import_name_type == IMPORT_NAME_UNDECORATE) 898 { 899 /* Truncate at the first '@'. */ 900 char *at = strchr (symbol, '@'); 901 902 if (at != NULL) 903 len = at - symbol; 904 } 905 906 id6->contents[0] = ordinal & 0xff; 907 id6->contents[1] = ordinal >> 8; 908 909 memcpy ((char *) id6->contents + 2, symbol, len); 910 id6->contents[len + 2] = '\0'; 911 } 912 913 if (import_name_type != IMPORT_ORDINAL) 914 { 915 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_RVA, id6); 916 pe_ILF_save_relocs (&vars, id4); 917 918 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_RVA, id6); 919 pe_ILF_save_relocs (&vars, id5); 920 } 921 922 /* Create extra sections depending upon the type of import we are dealing with. */ 923 switch (import_type) 924 { 925 int i; 926 927 case IMPORT_CODE: 928 /* Create a .text section. 929 First we need to look up its contents in the jump table. */ 930 for (i = NUM_ENTRIES (jtab); i--;) 931 { 932 if (jtab[i].size == 0) 933 continue; 934 if (jtab[i].magic == magic) 935 break; 936 } 937 /* If we did not find a matching entry something is wrong. */ 938 if (i < 0) 939 abort (); 940 941 /* Create the .text section. */ 942 text = pe_ILF_make_a_section (& vars, ".text", jtab[i].size, SEC_CODE); 943 if (text == NULL) 944 goto error_return; 945 946 /* Copy in the jump code. */ 947 memcpy (text->contents, jtab[i].data, jtab[i].size); 948 949 /* Create an import symbol. */ 950 pe_ILF_make_a_symbol (& vars, "__imp_", symbol_name, id5, 0); 951 imp_sym = vars.sym_ptr_ptr - 1; 952 imp_index = vars.sym_index - 1; 953 954 /* Create a reloc for the data in the text section. */ 955 #ifdef MIPS_ARCH_MAGIC_WINCE 956 if (magic == MIPS_ARCH_MAGIC_WINCE) 957 { 958 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) 0, BFD_RELOC_HI16_S, 959 (struct bfd_symbol **) imp_sym, 960 imp_index); 961 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_LO16, text); 962 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) 4, BFD_RELOC_LO16, 963 (struct bfd_symbol **) imp_sym, 964 imp_index); 965 } 966 else 967 #endif 968 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) jtab[i].offset, 969 BFD_RELOC_32, (asymbol **) imp_sym, 970 imp_index); 971 972 pe_ILF_save_relocs (& vars, text); 973 break; 974 975 case IMPORT_DATA: 976 break; 977 978 default: 979 /* XXX code not yet written. */ 980 abort (); 981 } 982 983 /* Initialise the bfd. */ 984 memset (& internal_f, 0, sizeof (internal_f)); 985 986 internal_f.f_magic = magic; 987 internal_f.f_symptr = 0; 988 internal_f.f_nsyms = 0; 989 internal_f.f_flags = F_AR32WR | F_LNNO; /* XXX is this correct ? */ 990 991 if ( ! bfd_set_start_address (abfd, (bfd_vma) 0) 992 || ! bfd_coff_set_arch_mach_hook (abfd, & internal_f)) 993 goto error_return; 994 995 if (bfd_coff_mkobject_hook (abfd, (void *) & internal_f, NULL) == NULL) 996 goto error_return; 997 998 coff_data (abfd)->pe = 1; 999 #ifdef THUMBPEMAGIC 1000 if (vars.magic == THUMBPEMAGIC) 1001 /* Stop some linker warnings about thumb code not supporting interworking. */ 1002 coff_data (abfd)->flags |= F_INTERWORK | F_INTERWORK_SET; 1003 #endif 1004 1005 /* Switch from file contents to memory contents. */ 1006 bfd_cache_close (abfd); 1007 1008 abfd->iostream = (void *) vars.bim; 1009 abfd->flags |= BFD_IN_MEMORY /* | HAS_LOCALS */; 1010 abfd->iovec = &_bfd_memory_iovec; 1011 abfd->where = 0; 1012 abfd->origin = 0; 1013 obj_sym_filepos (abfd) = 0; 1014 1015 /* Now create a symbol describing the imported value. */ 1016 switch (import_type) 1017 { 1018 case IMPORT_CODE: 1019 pe_ILF_make_a_symbol (& vars, "", symbol_name, text, 1020 BSF_NOT_AT_END | BSF_FUNCTION); 1021 1022 /* Create an import symbol for the DLL, without the 1023 .dll suffix. */ 1024 ptr = (bfd_byte *) strrchr (source_dll, '.'); 1025 if (ptr) 1026 * ptr = 0; 1027 pe_ILF_make_a_symbol (& vars, "__IMPORT_DESCRIPTOR_", source_dll, NULL, 0); 1028 if (ptr) 1029 * ptr = '.'; 1030 break; 1031 1032 case IMPORT_DATA: 1033 /* Nothing to do here. */ 1034 break; 1035 1036 default: 1037 /* XXX code not yet written. */ 1038 abort (); 1039 } 1040 1041 /* Point the bfd at the symbol table. */ 1042 obj_symbols (abfd) = vars.sym_cache; 1043 bfd_get_symcount (abfd) = vars.sym_index; 1044 1045 obj_raw_syments (abfd) = vars.native_syms; 1046 obj_raw_syment_count (abfd) = vars.sym_index; 1047 1048 obj_coff_external_syms (abfd) = (void *) vars.esym_table; 1049 obj_coff_keep_syms (abfd) = TRUE; 1050 1051 obj_convert (abfd) = vars.sym_table; 1052 obj_conv_table_size (abfd) = vars.sym_index; 1053 1054 obj_coff_strings (abfd) = vars.string_table; 1055 obj_coff_keep_strings (abfd) = TRUE; 1056 1057 abfd->flags |= HAS_SYMS; 1058 1059 return TRUE; 1060 1061 error_return: 1062 if (vars.bim->buffer != NULL) 1063 free (vars.bim->buffer); 1064 free (vars.bim); 1065 return FALSE; 1066 } 1067 1068 /* We have detected a Image Library Format archive element. 1069 Decode the element and return the appropriate target. */ 1070 1071 static const bfd_target * 1072 pe_ILF_object_p (bfd * abfd) 1073 { 1074 bfd_byte buffer[16]; 1075 bfd_byte * ptr; 1076 char * symbol_name; 1077 char * source_dll; 1078 unsigned int machine; 1079 bfd_size_type size; 1080 unsigned int ordinal; 1081 unsigned int types; 1082 unsigned int magic; 1083 1084 /* Upon entry the first four buyes of the ILF header have 1085 already been read. Now read the rest of the header. */ 1086 if (bfd_bread (buffer, (bfd_size_type) 16, abfd) != 16) 1087 return NULL; 1088 1089 ptr = buffer; 1090 1091 /* We do not bother to check the version number. 1092 version = H_GET_16 (abfd, ptr); */ 1093 ptr += 2; 1094 1095 machine = H_GET_16 (abfd, ptr); 1096 ptr += 2; 1097 1098 /* Check that the machine type is recognised. */ 1099 magic = 0; 1100 1101 switch (machine) 1102 { 1103 case IMAGE_FILE_MACHINE_UNKNOWN: 1104 case IMAGE_FILE_MACHINE_ALPHA: 1105 case IMAGE_FILE_MACHINE_ALPHA64: 1106 case IMAGE_FILE_MACHINE_IA64: 1107 break; 1108 1109 case IMAGE_FILE_MACHINE_I386: 1110 #ifdef I386MAGIC 1111 magic = I386MAGIC; 1112 #endif 1113 break; 1114 1115 case IMAGE_FILE_MACHINE_AMD64: 1116 #ifdef AMD64MAGIC 1117 magic = AMD64MAGIC; 1118 #endif 1119 break; 1120 1121 case IMAGE_FILE_MACHINE_M68K: 1122 #ifdef MC68AGIC 1123 magic = MC68MAGIC; 1124 #endif 1125 break; 1126 1127 case IMAGE_FILE_MACHINE_R3000: 1128 case IMAGE_FILE_MACHINE_R4000: 1129 case IMAGE_FILE_MACHINE_R10000: 1130 1131 case IMAGE_FILE_MACHINE_MIPS16: 1132 case IMAGE_FILE_MACHINE_MIPSFPU: 1133 case IMAGE_FILE_MACHINE_MIPSFPU16: 1134 #ifdef MIPS_ARCH_MAGIC_WINCE 1135 magic = MIPS_ARCH_MAGIC_WINCE; 1136 #endif 1137 break; 1138 1139 case IMAGE_FILE_MACHINE_SH3: 1140 case IMAGE_FILE_MACHINE_SH4: 1141 #ifdef SH_ARCH_MAGIC_WINCE 1142 magic = SH_ARCH_MAGIC_WINCE; 1143 #endif 1144 break; 1145 1146 case IMAGE_FILE_MACHINE_ARM: 1147 #ifdef ARMPEMAGIC 1148 magic = ARMPEMAGIC; 1149 #endif 1150 break; 1151 1152 case IMAGE_FILE_MACHINE_THUMB: 1153 #ifdef THUMBPEMAGIC 1154 { 1155 extern const bfd_target TARGET_LITTLE_SYM; 1156 1157 if (abfd->xvec == & TARGET_LITTLE_SYM) 1158 magic = THUMBPEMAGIC; 1159 } 1160 #endif 1161 break; 1162 1163 case IMAGE_FILE_MACHINE_POWERPC: 1164 /* We no longer support PowerPC. */ 1165 default: 1166 _bfd_error_handler 1167 (_("%B: Unrecognised machine type (0x%x)" 1168 " in Import Library Format archive"), 1169 abfd, machine); 1170 bfd_set_error (bfd_error_malformed_archive); 1171 1172 return NULL; 1173 break; 1174 } 1175 1176 if (magic == 0) 1177 { 1178 _bfd_error_handler 1179 (_("%B: Recognised but unhandled machine type (0x%x)" 1180 " in Import Library Format archive"), 1181 abfd, machine); 1182 bfd_set_error (bfd_error_wrong_format); 1183 1184 return NULL; 1185 } 1186 1187 /* We do not bother to check the date. 1188 date = H_GET_32 (abfd, ptr); */ 1189 ptr += 4; 1190 1191 size = H_GET_32 (abfd, ptr); 1192 ptr += 4; 1193 1194 if (size == 0) 1195 { 1196 _bfd_error_handler 1197 (_("%B: size field is zero in Import Library Format header"), abfd); 1198 bfd_set_error (bfd_error_malformed_archive); 1199 1200 return NULL; 1201 } 1202 1203 ordinal = H_GET_16 (abfd, ptr); 1204 ptr += 2; 1205 1206 types = H_GET_16 (abfd, ptr); 1207 /* ptr += 2; */ 1208 1209 /* Now read in the two strings that follow. */ 1210 ptr = (bfd_byte *) bfd_alloc (abfd, size); 1211 if (ptr == NULL) 1212 return NULL; 1213 1214 if (bfd_bread (ptr, size, abfd) != size) 1215 { 1216 bfd_release (abfd, ptr); 1217 return NULL; 1218 } 1219 1220 symbol_name = (char *) ptr; 1221 source_dll = symbol_name + strlen (symbol_name) + 1; 1222 1223 /* Verify that the strings are null terminated. */ 1224 if (ptr[size - 1] != 0 1225 || (bfd_size_type) ((bfd_byte *) source_dll - ptr) >= size) 1226 { 1227 _bfd_error_handler 1228 (_("%B: string not null terminated in ILF object file."), abfd); 1229 bfd_set_error (bfd_error_malformed_archive); 1230 bfd_release (abfd, ptr); 1231 return NULL; 1232 } 1233 1234 /* Now construct the bfd. */ 1235 if (! pe_ILF_build_a_bfd (abfd, magic, symbol_name, 1236 source_dll, ordinal, types)) 1237 { 1238 bfd_release (abfd, ptr); 1239 return NULL; 1240 } 1241 1242 return abfd->xvec; 1243 } 1244 1245 static const bfd_target * 1246 pe_bfd_object_p (bfd * abfd) 1247 { 1248 bfd_byte buffer[4]; 1249 struct external_PEI_DOS_hdr dos_hdr; 1250 struct external_PEI_IMAGE_hdr image_hdr; 1251 file_ptr offset; 1252 1253 /* Detect if this a Microsoft Import Library Format element. */ 1254 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 1255 || bfd_bread (buffer, (bfd_size_type) 4, abfd) != 4) 1256 { 1257 if (bfd_get_error () != bfd_error_system_call) 1258 bfd_set_error (bfd_error_wrong_format); 1259 return NULL; 1260 } 1261 1262 if (H_GET_32 (abfd, buffer) == 0xffff0000) 1263 return pe_ILF_object_p (abfd); 1264 1265 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 1266 || bfd_bread (&dos_hdr, (bfd_size_type) sizeof (dos_hdr), abfd) 1267 != sizeof (dos_hdr)) 1268 { 1269 if (bfd_get_error () != bfd_error_system_call) 1270 bfd_set_error (bfd_error_wrong_format); 1271 return NULL; 1272 } 1273 1274 /* There are really two magic numbers involved; the magic number 1275 that says this is a NT executable (PEI) and the magic number that 1276 determines the architecture. The former is DOSMAGIC, stored in 1277 the e_magic field. The latter is stored in the f_magic field. 1278 If the NT magic number isn't valid, the architecture magic number 1279 could be mimicked by some other field (specifically, the number 1280 of relocs in section 3). Since this routine can only be called 1281 correctly for a PEI file, check the e_magic number here, and, if 1282 it doesn't match, clobber the f_magic number so that we don't get 1283 a false match. */ 1284 if (H_GET_16 (abfd, dos_hdr.e_magic) != DOSMAGIC) 1285 { 1286 bfd_set_error (bfd_error_wrong_format); 1287 return NULL; 1288 } 1289 1290 offset = H_GET_32 (abfd, dos_hdr.e_lfanew); 1291 if (bfd_seek (abfd, offset, SEEK_SET) != 0 1292 || (bfd_bread (&image_hdr, (bfd_size_type) sizeof (image_hdr), abfd) 1293 != sizeof (image_hdr))) 1294 { 1295 if (bfd_get_error () != bfd_error_system_call) 1296 bfd_set_error (bfd_error_wrong_format); 1297 return NULL; 1298 } 1299 1300 if (H_GET_32 (abfd, image_hdr.nt_signature) != 0x4550) 1301 { 1302 bfd_set_error (bfd_error_wrong_format); 1303 return NULL; 1304 } 1305 1306 /* Here is the hack. coff_object_p wants to read filhsz bytes to 1307 pick up the COFF header for PE, see "struct external_PEI_filehdr" 1308 in include/coff/pe.h. We adjust so that that will work. */ 1309 if (bfd_seek (abfd, (file_ptr) (offset - sizeof (dos_hdr)), SEEK_SET) != 0) 1310 { 1311 if (bfd_get_error () != bfd_error_system_call) 1312 bfd_set_error (bfd_error_wrong_format); 1313 return NULL; 1314 } 1315 1316 return coff_object_p (abfd); 1317 } 1318 1319 #define coff_object_p pe_bfd_object_p 1320 #endif /* COFF_IMAGE_WITH_PE */ 1321