1 /* Support for the generic parts of PE/PEI, for BFD. 2 Copyright (C) 1995-2014 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 (at) 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 130 static void 131 coff_swap_reloc_in (bfd * abfd, void * src, void * dst) 132 { 133 RELOC *reloc_src = (RELOC *) src; 134 struct internal_reloc *reloc_dst = (struct internal_reloc *) dst; 135 136 reloc_dst->r_vaddr = H_GET_32 (abfd, reloc_src->r_vaddr); 137 reloc_dst->r_symndx = H_GET_S32 (abfd, reloc_src->r_symndx); 138 reloc_dst->r_type = H_GET_16 (abfd, reloc_src->r_type); 139 #ifdef SWAP_IN_RELOC_OFFSET 140 reloc_dst->r_offset = SWAP_IN_RELOC_OFFSET (abfd, reloc_src->r_offset); 141 #endif 142 } 143 144 static unsigned int 145 coff_swap_reloc_out (bfd * abfd, void * src, void * dst) 146 { 147 struct internal_reloc *reloc_src = (struct internal_reloc *) src; 148 struct external_reloc *reloc_dst = (struct external_reloc *) dst; 149 150 H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr); 151 H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx); 152 H_PUT_16 (abfd, reloc_src->r_type, reloc_dst->r_type); 153 154 #ifdef SWAP_OUT_RELOC_OFFSET 155 SWAP_OUT_RELOC_OFFSET (abfd, reloc_src->r_offset, reloc_dst->r_offset); 156 #endif 157 #ifdef SWAP_OUT_RELOC_EXTRA 158 SWAP_OUT_RELOC_EXTRA (abfd, reloc_src, reloc_dst); 159 #endif 160 return RELSZ; 161 } 162 #endif /* not NO_COFF_RELOCS */ 163 164 #ifdef COFF_IMAGE_WITH_PE 165 #undef FILHDR 166 #define FILHDR struct external_PEI_IMAGE_hdr 167 #endif 168 169 static void 170 coff_swap_filehdr_in (bfd * abfd, void * src, void * dst) 171 { 172 FILHDR *filehdr_src = (FILHDR *) src; 173 struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst; 174 175 filehdr_dst->f_magic = H_GET_16 (abfd, filehdr_src->f_magic); 176 filehdr_dst->f_nscns = H_GET_16 (abfd, filehdr_src->f_nscns); 177 filehdr_dst->f_timdat = H_GET_32 (abfd, filehdr_src->f_timdat); 178 filehdr_dst->f_nsyms = H_GET_32 (abfd, filehdr_src->f_nsyms); 179 filehdr_dst->f_flags = H_GET_16 (abfd, filehdr_src->f_flags); 180 filehdr_dst->f_symptr = H_GET_32 (abfd, filehdr_src->f_symptr); 181 182 /* Other people's tools sometimes generate headers with an nsyms but 183 a zero symptr. */ 184 if (filehdr_dst->f_nsyms != 0 && filehdr_dst->f_symptr == 0) 185 { 186 filehdr_dst->f_nsyms = 0; 187 filehdr_dst->f_flags |= F_LSYMS; 188 } 189 190 filehdr_dst->f_opthdr = H_GET_16 (abfd, filehdr_src-> f_opthdr); 191 } 192 193 #ifdef COFF_IMAGE_WITH_PE 194 # define coff_swap_filehdr_out _bfd_XXi_only_swap_filehdr_out 195 #elif defined COFF_WITH_pex64 196 # define coff_swap_filehdr_out _bfd_pex64_only_swap_filehdr_out 197 #elif defined COFF_WITH_pep 198 # define coff_swap_filehdr_out _bfd_pep_only_swap_filehdr_out 199 #else 200 # define coff_swap_filehdr_out _bfd_pe_only_swap_filehdr_out 201 #endif 202 203 static void 204 coff_swap_scnhdr_in (bfd * abfd, void * ext, void * in) 205 { 206 SCNHDR *scnhdr_ext = (SCNHDR *) ext; 207 struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in; 208 209 memcpy (scnhdr_int->s_name, scnhdr_ext->s_name, sizeof (scnhdr_int->s_name)); 210 211 scnhdr_int->s_vaddr = GET_SCNHDR_VADDR (abfd, scnhdr_ext->s_vaddr); 212 scnhdr_int->s_paddr = GET_SCNHDR_PADDR (abfd, scnhdr_ext->s_paddr); 213 scnhdr_int->s_size = GET_SCNHDR_SIZE (abfd, scnhdr_ext->s_size); 214 scnhdr_int->s_scnptr = GET_SCNHDR_SCNPTR (abfd, scnhdr_ext->s_scnptr); 215 scnhdr_int->s_relptr = GET_SCNHDR_RELPTR (abfd, scnhdr_ext->s_relptr); 216 scnhdr_int->s_lnnoptr = GET_SCNHDR_LNNOPTR (abfd, scnhdr_ext->s_lnnoptr); 217 scnhdr_int->s_flags = H_GET_32 (abfd, scnhdr_ext->s_flags); 218 219 /* MS handles overflow of line numbers by carrying into the reloc 220 field (it appears). Since it's supposed to be zero for PE 221 *IMAGE* format, that's safe. This is still a bit iffy. */ 222 #ifdef COFF_IMAGE_WITH_PE 223 scnhdr_int->s_nlnno = (H_GET_16 (abfd, scnhdr_ext->s_nlnno) 224 + (H_GET_16 (abfd, scnhdr_ext->s_nreloc) << 16)); 225 scnhdr_int->s_nreloc = 0; 226 #else 227 scnhdr_int->s_nreloc = H_GET_16 (abfd, scnhdr_ext->s_nreloc); 228 scnhdr_int->s_nlnno = H_GET_16 (abfd, scnhdr_ext->s_nlnno); 229 #endif 230 231 if (scnhdr_int->s_vaddr != 0) 232 { 233 scnhdr_int->s_vaddr += pe_data (abfd)->pe_opthdr.ImageBase; 234 /* Do not cut upper 32-bits for 64-bit vma. */ 235 #ifndef COFF_WITH_pex64 236 scnhdr_int->s_vaddr &= 0xffffffff; 237 #endif 238 } 239 240 #ifndef COFF_NO_HACK_SCNHDR_SIZE 241 /* If this section holds uninitialized data and is from an object file 242 or from an executable image that has not initialized the field, 243 or if the image is an executable file and the physical size is padded, 244 use the virtual size (stored in s_paddr) instead. */ 245 if (scnhdr_int->s_paddr > 0 246 && (((scnhdr_int->s_flags & IMAGE_SCN_CNT_UNINITIALIZED_DATA) != 0 247 && (! bfd_pei_p (abfd) || scnhdr_int->s_size == 0)) 248 || (bfd_pei_p (abfd) && (scnhdr_int->s_size > scnhdr_int->s_paddr)))) 249 /* This code used to set scnhdr_int->s_paddr to 0. However, 250 coff_set_alignment_hook stores s_paddr in virt_size, which 251 only works if it correctly holds the virtual size of the 252 section. */ 253 scnhdr_int->s_size = scnhdr_int->s_paddr; 254 #endif 255 } 256 257 static bfd_boolean 258 pe_mkobject (bfd * abfd) 259 { 260 pe_data_type *pe; 261 bfd_size_type amt = sizeof (pe_data_type); 262 263 abfd->tdata.pe_obj_data = (struct pe_tdata *) bfd_zalloc (abfd, amt); 264 265 if (abfd->tdata.pe_obj_data == 0) 266 return FALSE; 267 268 pe = pe_data (abfd); 269 270 pe->coff.pe = 1; 271 272 /* in_reloc_p is architecture dependent. */ 273 pe->in_reloc_p = in_reloc_p; 274 275 memset (& pe->pe_opthdr, 0, sizeof pe->pe_opthdr); 276 return TRUE; 277 } 278 279 /* Create the COFF backend specific information. */ 280 281 static void * 282 pe_mkobject_hook (bfd * abfd, 283 void * filehdr, 284 void * aouthdr ATTRIBUTE_UNUSED) 285 { 286 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr; 287 pe_data_type *pe; 288 289 if (! pe_mkobject (abfd)) 290 return NULL; 291 292 pe = pe_data (abfd); 293 pe->coff.sym_filepos = internal_f->f_symptr; 294 /* These members communicate important constants about the symbol 295 table to GDB's symbol-reading code. These `constants' 296 unfortunately vary among coff implementations... */ 297 pe->coff.local_n_btmask = N_BTMASK; 298 pe->coff.local_n_btshft = N_BTSHFT; 299 pe->coff.local_n_tmask = N_TMASK; 300 pe->coff.local_n_tshift = N_TSHIFT; 301 pe->coff.local_symesz = SYMESZ; 302 pe->coff.local_auxesz = AUXESZ; 303 pe->coff.local_linesz = LINESZ; 304 305 pe->coff.timestamp = internal_f->f_timdat; 306 307 obj_raw_syment_count (abfd) = 308 obj_conv_table_size (abfd) = 309 internal_f->f_nsyms; 310 311 pe->real_flags = internal_f->f_flags; 312 313 if ((internal_f->f_flags & F_DLL) != 0) 314 pe->dll = 1; 315 316 if ((internal_f->f_flags & IMAGE_FILE_DEBUG_STRIPPED) == 0) 317 abfd->flags |= HAS_DEBUG; 318 319 #ifdef COFF_IMAGE_WITH_PE 320 if (aouthdr) 321 pe->pe_opthdr = ((struct internal_aouthdr *) aouthdr)->pe; 322 #endif 323 324 #ifdef ARM 325 if (! _bfd_coff_arm_set_private_flags (abfd, internal_f->f_flags)) 326 coff_data (abfd) ->flags = 0; 327 #endif 328 329 return (void *) pe; 330 } 331 332 static bfd_boolean 333 pe_print_private_bfd_data (bfd *abfd, void * vfile) 334 { 335 FILE *file = (FILE *) vfile; 336 337 if (!_bfd_XX_print_private_bfd_data_common (abfd, vfile)) 338 return FALSE; 339 340 if (pe_saved_coff_bfd_print_private_bfd_data == NULL) 341 return TRUE; 342 343 fputc ('\n', file); 344 345 return pe_saved_coff_bfd_print_private_bfd_data (abfd, vfile); 346 } 347 348 /* Copy any private info we understand from the input bfd 349 to the output bfd. */ 350 351 static bfd_boolean 352 pe_bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 353 { 354 /* PR binutils/716: Copy the large address aware flag. 355 XXX: Should we be copying other flags or other fields in the pe_data() 356 structure ? */ 357 if (pe_data (obfd) != NULL 358 && pe_data (ibfd) != NULL 359 && pe_data (ibfd)->real_flags & IMAGE_FILE_LARGE_ADDRESS_AWARE) 360 pe_data (obfd)->real_flags |= IMAGE_FILE_LARGE_ADDRESS_AWARE; 361 362 if (!_bfd_XX_bfd_copy_private_bfd_data_common (ibfd, obfd)) 363 return FALSE; 364 365 if (pe_saved_coff_bfd_copy_private_bfd_data) 366 return pe_saved_coff_bfd_copy_private_bfd_data (ibfd, obfd); 367 368 return TRUE; 369 } 370 371 #define coff_bfd_copy_private_section_data \ 372 _bfd_XX_bfd_copy_private_section_data 373 374 #define coff_get_symbol_info _bfd_XX_get_symbol_info 375 376 #ifdef COFF_IMAGE_WITH_PE 377 378 /* Code to handle Microsoft's Image Library Format. 380 Also known as LINK6 format. 381 Documentation about this format can be found at: 382 383 http://msdn.microsoft.com/library/specs/pecoff_section8.htm */ 384 385 /* The following constants specify the sizes of the various data 386 structures that we have to create in order to build a bfd describing 387 an ILF object file. The final "+ 1" in the definitions of SIZEOF_IDATA6 388 and SIZEOF_IDATA7 below is to allow for the possibility that we might 389 need a padding byte in order to ensure 16 bit alignment for the section's 390 contents. 391 392 The value for SIZEOF_ILF_STRINGS is computed as follows: 393 394 There will be NUM_ILF_SECTIONS section symbols. Allow 9 characters 395 per symbol for their names (longest section name is .idata$x). 396 397 There will be two symbols for the imported value, one the symbol name 398 and one with _imp__ prefixed. Allowing for the terminating nul's this 399 is strlen (symbol_name) * 2 + 8 + 21 + strlen (source_dll). 400 401 The strings in the string table must start STRING__SIZE_SIZE bytes into 402 the table in order to for the string lookup code in coffgen/coffcode to 403 work. */ 404 #define NUM_ILF_RELOCS 8 405 #define NUM_ILF_SECTIONS 6 406 #define NUM_ILF_SYMS (2 + NUM_ILF_SECTIONS) 407 408 #define SIZEOF_ILF_SYMS (NUM_ILF_SYMS * sizeof (* vars.sym_cache)) 409 #define SIZEOF_ILF_SYM_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_table)) 410 #define SIZEOF_ILF_NATIVE_SYMS (NUM_ILF_SYMS * sizeof (* vars.native_syms)) 411 #define SIZEOF_ILF_SYM_PTR_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_ptr_table)) 412 #define SIZEOF_ILF_EXT_SYMS (NUM_ILF_SYMS * sizeof (* vars.esym_table)) 413 #define SIZEOF_ILF_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.reltab)) 414 #define SIZEOF_ILF_INT_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.int_reltab)) 415 #define SIZEOF_ILF_STRINGS (strlen (symbol_name) * 2 + 8 \ 416 + 21 + strlen (source_dll) \ 417 + NUM_ILF_SECTIONS * 9 \ 418 + STRING_SIZE_SIZE) 419 #define SIZEOF_IDATA2 (5 * 4) 420 421 /* For PEx64 idata4 & 5 have thumb size of 8 bytes. */ 422 #ifdef COFF_WITH_pex64 423 #define SIZEOF_IDATA4 (2 * 4) 424 #define SIZEOF_IDATA5 (2 * 4) 425 #else 426 #define SIZEOF_IDATA4 (1 * 4) 427 #define SIZEOF_IDATA5 (1 * 4) 428 #endif 429 430 #define SIZEOF_IDATA6 (2 + strlen (symbol_name) + 1 + 1) 431 #define SIZEOF_IDATA7 (strlen (source_dll) + 1 + 1) 432 #define SIZEOF_ILF_SECTIONS (NUM_ILF_SECTIONS * sizeof (struct coff_section_tdata)) 433 434 #define ILF_DATA_SIZE \ 435 + SIZEOF_ILF_SYMS \ 436 + SIZEOF_ILF_SYM_TABLE \ 437 + SIZEOF_ILF_NATIVE_SYMS \ 438 + SIZEOF_ILF_SYM_PTR_TABLE \ 439 + SIZEOF_ILF_EXT_SYMS \ 440 + SIZEOF_ILF_RELOCS \ 441 + SIZEOF_ILF_INT_RELOCS \ 442 + SIZEOF_ILF_STRINGS \ 443 + SIZEOF_IDATA2 \ 444 + SIZEOF_IDATA4 \ 445 + SIZEOF_IDATA5 \ 446 + SIZEOF_IDATA6 \ 447 + SIZEOF_IDATA7 \ 448 + SIZEOF_ILF_SECTIONS \ 449 + MAX_TEXT_SECTION_SIZE 450 451 /* Create an empty relocation against the given symbol. */ 452 453 static void 454 pe_ILF_make_a_symbol_reloc (pe_ILF_vars * vars, 455 bfd_vma address, 456 bfd_reloc_code_real_type reloc, 457 struct bfd_symbol ** sym, 458 unsigned int sym_index) 459 { 460 arelent * entry; 461 struct internal_reloc * internal; 462 463 entry = vars->reltab + vars->relcount; 464 internal = vars->int_reltab + vars->relcount; 465 466 entry->address = address; 467 entry->addend = 0; 468 entry->howto = bfd_reloc_type_lookup (vars->abfd, reloc); 469 entry->sym_ptr_ptr = sym; 470 471 internal->r_vaddr = address; 472 internal->r_symndx = sym_index; 473 internal->r_type = entry->howto->type; 474 475 vars->relcount ++; 476 477 BFD_ASSERT (vars->relcount <= NUM_ILF_RELOCS); 478 } 479 480 /* Create an empty relocation against the given section. */ 481 482 static void 483 pe_ILF_make_a_reloc (pe_ILF_vars * vars, 484 bfd_vma address, 485 bfd_reloc_code_real_type reloc, 486 asection_ptr sec) 487 { 488 pe_ILF_make_a_symbol_reloc (vars, address, reloc, sec->symbol_ptr_ptr, 489 coff_section_data (vars->abfd, sec)->i); 490 } 491 492 /* Move the queued relocs into the given section. */ 493 494 static void 495 pe_ILF_save_relocs (pe_ILF_vars * vars, 496 asection_ptr sec) 497 { 498 /* Make sure that there is somewhere to store the internal relocs. */ 499 if (coff_section_data (vars->abfd, sec) == NULL) 500 /* We should probably return an error indication here. */ 501 abort (); 502 503 coff_section_data (vars->abfd, sec)->relocs = vars->int_reltab; 504 coff_section_data (vars->abfd, sec)->keep_relocs = TRUE; 505 506 sec->relocation = vars->reltab; 507 sec->reloc_count = vars->relcount; 508 sec->flags |= SEC_RELOC; 509 510 vars->reltab += vars->relcount; 511 vars->int_reltab += vars->relcount; 512 vars->relcount = 0; 513 514 BFD_ASSERT ((bfd_byte *) vars->int_reltab < (bfd_byte *) vars->string_table); 515 } 516 517 /* Create a global symbol and add it to the relevant tables. */ 518 519 static void 520 pe_ILF_make_a_symbol (pe_ILF_vars * vars, 521 const char * prefix, 522 const char * symbol_name, 523 asection_ptr section, 524 flagword extra_flags) 525 { 526 coff_symbol_type * sym; 527 combined_entry_type * ent; 528 SYMENT * esym; 529 unsigned short sclass; 530 531 if (extra_flags & BSF_LOCAL) 532 sclass = C_STAT; 533 else 534 sclass = C_EXT; 535 536 #ifdef THUMBPEMAGIC 537 if (vars->magic == THUMBPEMAGIC) 538 { 539 if (extra_flags & BSF_FUNCTION) 540 sclass = C_THUMBEXTFUNC; 541 else if (extra_flags & BSF_LOCAL) 542 sclass = C_THUMBSTAT; 543 else 544 sclass = C_THUMBEXT; 545 } 546 #endif 547 548 BFD_ASSERT (vars->sym_index < NUM_ILF_SYMS); 549 550 sym = vars->sym_ptr; 551 ent = vars->native_ptr; 552 esym = vars->esym_ptr; 553 554 /* Copy the symbol's name into the string table. */ 555 sprintf (vars->string_ptr, "%s%s", prefix, symbol_name); 556 557 if (section == NULL) 558 section = bfd_und_section_ptr; 559 560 /* Initialise the external symbol. */ 561 H_PUT_32 (vars->abfd, vars->string_ptr - vars->string_table, 562 esym->e.e.e_offset); 563 H_PUT_16 (vars->abfd, section->target_index, esym->e_scnum); 564 esym->e_sclass[0] = sclass; 565 566 /* The following initialisations are unnecessary - the memory is 567 zero initialised. They are just kept here as reminders. */ 568 569 /* Initialise the internal symbol structure. */ 570 ent->u.syment.n_sclass = sclass; 571 ent->u.syment.n_scnum = section->target_index; 572 ent->u.syment._n._n_n._n_offset = (bfd_hostptr_t) sym; 573 ent->is_sym = TRUE; 574 575 sym->symbol.the_bfd = vars->abfd; 576 sym->symbol.name = vars->string_ptr; 577 sym->symbol.flags = BSF_EXPORT | BSF_GLOBAL | extra_flags; 578 sym->symbol.section = section; 579 sym->native = ent; 580 581 * vars->table_ptr = vars->sym_index; 582 * vars->sym_ptr_ptr = sym; 583 584 /* Adjust pointers for the next symbol. */ 585 vars->sym_index ++; 586 vars->sym_ptr ++; 587 vars->sym_ptr_ptr ++; 588 vars->table_ptr ++; 589 vars->native_ptr ++; 590 vars->esym_ptr ++; 591 vars->string_ptr += strlen (symbol_name) + strlen (prefix) + 1; 592 593 BFD_ASSERT (vars->string_ptr < vars->end_string_ptr); 594 } 595 596 /* Create a section. */ 597 598 static asection_ptr 599 pe_ILF_make_a_section (pe_ILF_vars * vars, 600 const char * name, 601 unsigned int size, 602 flagword extra_flags) 603 { 604 asection_ptr sec; 605 flagword flags; 606 607 sec = bfd_make_section_old_way (vars->abfd, name); 608 if (sec == NULL) 609 return NULL; 610 611 flags = SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_IN_MEMORY; 612 613 bfd_set_section_flags (vars->abfd, sec, flags | extra_flags); 614 615 (void) bfd_set_section_alignment (vars->abfd, sec, 2); 616 617 /* Check that we will not run out of space. */ 618 BFD_ASSERT (vars->data + size < vars->bim->buffer + vars->bim->size); 619 620 /* Set the section size and contents. The actual 621 contents are filled in by our parent. */ 622 bfd_set_section_size (vars->abfd, sec, (bfd_size_type) size); 623 sec->contents = vars->data; 624 sec->target_index = vars->sec_index ++; 625 626 /* Advance data pointer in the vars structure. */ 627 vars->data += size; 628 629 /* Skip the padding byte if it was not needed. 630 The logic here is that if the string length is odd, 631 then the entire string length, including the null byte, 632 is even and so the extra, padding byte, is not needed. */ 633 if (size & 1) 634 vars->data --; 635 636 /* Create a coff_section_tdata structure for our use. */ 637 sec->used_by_bfd = (struct coff_section_tdata *) vars->data; 638 vars->data += sizeof (struct coff_section_tdata); 639 640 BFD_ASSERT (vars->data <= vars->bim->buffer + vars->bim->size); 641 642 /* Create a symbol to refer to this section. */ 643 pe_ILF_make_a_symbol (vars, "", name, sec, BSF_LOCAL); 644 645 /* Cache the index to the symbol in the coff_section_data structure. */ 646 coff_section_data (vars->abfd, sec)->i = vars->sym_index - 1; 647 648 return sec; 649 } 650 651 /* This structure contains the code that goes into the .text section 652 in order to perform a jump into the DLL lookup table. The entries 653 in the table are index by the magic number used to represent the 654 machine type in the PE file. The contents of the data[] arrays in 655 these entries are stolen from the jtab[] arrays in ld/pe-dll.c. 656 The SIZE field says how many bytes in the DATA array are actually 657 used. The OFFSET field says where in the data array the address 658 of the .idata$5 section should be placed. */ 659 #define MAX_TEXT_SECTION_SIZE 32 660 661 typedef struct 662 { 663 unsigned short magic; 664 unsigned char data[MAX_TEXT_SECTION_SIZE]; 665 unsigned int size; 666 unsigned int offset; 667 } 668 jump_table; 669 670 static jump_table jtab[] = 671 { 672 #ifdef I386MAGIC 673 { I386MAGIC, 674 { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 }, 675 8, 2 676 }, 677 #endif 678 679 #ifdef AMD64MAGIC 680 { AMD64MAGIC, 681 { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 }, 682 8, 2 683 }, 684 #endif 685 686 #ifdef MC68MAGIC 687 { MC68MAGIC, 688 { /* XXX fill me in */ }, 689 0, 0 690 }, 691 #endif 692 693 #ifdef MIPS_ARCH_MAGIC_WINCE 694 { MIPS_ARCH_MAGIC_WINCE, 695 { 0x00, 0x00, 0x08, 0x3c, 0x00, 0x00, 0x08, 0x8d, 696 0x08, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00 }, 697 16, 0 698 }, 699 #endif 700 701 #ifdef SH_ARCH_MAGIC_WINCE 702 { SH_ARCH_MAGIC_WINCE, 703 { 0x01, 0xd0, 0x02, 0x60, 0x2b, 0x40, 704 0x09, 0x00, 0x00, 0x00, 0x00, 0x00 }, 705 12, 8 706 }, 707 #endif 708 709 #ifdef ARMPEMAGIC 710 { ARMPEMAGIC, 711 { 0x00, 0xc0, 0x9f, 0xe5, 0x00, 0xf0, 712 0x9c, 0xe5, 0x00, 0x00, 0x00, 0x00}, 713 12, 8 714 }, 715 #endif 716 717 #ifdef THUMBPEMAGIC 718 { THUMBPEMAGIC, 719 { 0x40, 0xb4, 0x02, 0x4e, 0x36, 0x68, 0xb4, 0x46, 720 0x40, 0xbc, 0x60, 0x47, 0x00, 0x00, 0x00, 0x00 }, 721 16, 12 722 }, 723 #endif 724 { 0, { 0 }, 0, 0 } 725 }; 726 727 #ifndef NUM_ENTRIES 728 #define NUM_ENTRIES(a) (sizeof (a) / sizeof (a)[0]) 729 #endif 730 731 /* Build a full BFD from the information supplied in a ILF object. */ 732 733 static bfd_boolean 734 pe_ILF_build_a_bfd (bfd * abfd, 735 unsigned int magic, 736 char * symbol_name, 737 char * source_dll, 738 unsigned int ordinal, 739 unsigned int types) 740 { 741 bfd_byte * ptr; 742 pe_ILF_vars vars; 743 struct internal_filehdr internal_f; 744 unsigned int import_type; 745 unsigned int import_name_type; 746 asection_ptr id4, id5, id6 = NULL, text = NULL; 747 coff_symbol_type ** imp_sym; 748 unsigned int imp_index; 749 750 /* Decode and verify the types field of the ILF structure. */ 751 import_type = types & 0x3; 752 import_name_type = (types & 0x1c) >> 2; 753 754 switch (import_type) 755 { 756 case IMPORT_CODE: 757 case IMPORT_DATA: 758 break; 759 760 case IMPORT_CONST: 761 /* XXX code yet to be written. */ 762 _bfd_error_handler (_("%B: Unhandled import type; %x"), 763 abfd, import_type); 764 return FALSE; 765 766 default: 767 _bfd_error_handler (_("%B: Unrecognised import type; %x"), 768 abfd, import_type); 769 return FALSE; 770 } 771 772 switch (import_name_type) 773 { 774 case IMPORT_ORDINAL: 775 case IMPORT_NAME: 776 case IMPORT_NAME_NOPREFIX: 777 case IMPORT_NAME_UNDECORATE: 778 break; 779 780 default: 781 _bfd_error_handler (_("%B: Unrecognised import name type; %x"), 782 abfd, import_name_type); 783 return FALSE; 784 } 785 786 /* Initialise local variables. 787 788 Note these are kept in a structure rather than being 789 declared as statics since bfd frowns on global variables. 790 791 We are going to construct the contents of the BFD in memory, 792 so allocate all the space that we will need right now. */ 793 vars.bim 794 = (struct bfd_in_memory *) bfd_malloc ((bfd_size_type) sizeof (*vars.bim)); 795 if (vars.bim == NULL) 796 return FALSE; 797 798 ptr = (bfd_byte *) bfd_zmalloc ((bfd_size_type) ILF_DATA_SIZE); 799 vars.bim->buffer = ptr; 800 vars.bim->size = ILF_DATA_SIZE; 801 if (ptr == NULL) 802 goto error_return; 803 804 /* Initialise the pointers to regions of the memory and the 805 other contents of the pe_ILF_vars structure as well. */ 806 vars.sym_cache = (coff_symbol_type *) ptr; 807 vars.sym_ptr = (coff_symbol_type *) ptr; 808 vars.sym_index = 0; 809 ptr += SIZEOF_ILF_SYMS; 810 811 vars.sym_table = (unsigned int *) ptr; 812 vars.table_ptr = (unsigned int *) ptr; 813 ptr += SIZEOF_ILF_SYM_TABLE; 814 815 vars.native_syms = (combined_entry_type *) ptr; 816 vars.native_ptr = (combined_entry_type *) ptr; 817 ptr += SIZEOF_ILF_NATIVE_SYMS; 818 819 vars.sym_ptr_table = (coff_symbol_type **) ptr; 820 vars.sym_ptr_ptr = (coff_symbol_type **) ptr; 821 ptr += SIZEOF_ILF_SYM_PTR_TABLE; 822 823 vars.esym_table = (SYMENT *) ptr; 824 vars.esym_ptr = (SYMENT *) ptr; 825 ptr += SIZEOF_ILF_EXT_SYMS; 826 827 vars.reltab = (arelent *) ptr; 828 vars.relcount = 0; 829 ptr += SIZEOF_ILF_RELOCS; 830 831 vars.int_reltab = (struct internal_reloc *) ptr; 832 ptr += SIZEOF_ILF_INT_RELOCS; 833 834 vars.string_table = (char *) ptr; 835 vars.string_ptr = (char *) ptr + STRING_SIZE_SIZE; 836 ptr += SIZEOF_ILF_STRINGS; 837 vars.end_string_ptr = (char *) ptr; 838 839 /* The remaining space in bim->buffer is used 840 by the pe_ILF_make_a_section() function. */ 841 vars.data = ptr; 842 vars.abfd = abfd; 843 vars.sec_index = 0; 844 vars.magic = magic; 845 846 /* Create the initial .idata$<n> sections: 847 [.idata$2: Import Directory Table -- not needed] 848 .idata$4: Import Lookup Table 849 .idata$5: Import Address Table 850 851 Note we do not create a .idata$3 section as this is 852 created for us by the linker script. */ 853 id4 = pe_ILF_make_a_section (& vars, ".idata$4", SIZEOF_IDATA4, 0); 854 id5 = pe_ILF_make_a_section (& vars, ".idata$5", SIZEOF_IDATA5, 0); 855 if (id4 == NULL || id5 == NULL) 856 goto error_return; 857 858 /* Fill in the contents of these sections. */ 859 if (import_name_type == IMPORT_ORDINAL) 860 { 861 if (ordinal == 0) 862 /* XXX - treat as IMPORT_NAME ??? */ 863 abort (); 864 865 #ifdef COFF_WITH_pex64 866 ((unsigned int *) id4->contents)[0] = ordinal; 867 ((unsigned int *) id4->contents)[1] = 0x80000000; 868 ((unsigned int *) id5->contents)[0] = ordinal; 869 ((unsigned int *) id5->contents)[1] = 0x80000000; 870 #else 871 * (unsigned int *) id4->contents = ordinal | 0x80000000; 872 * (unsigned int *) id5->contents = ordinal | 0x80000000; 873 #endif 874 } 875 else 876 { 877 char * symbol; 878 unsigned int len; 879 880 /* Create .idata$6 - the Hint Name Table. */ 881 id6 = pe_ILF_make_a_section (& vars, ".idata$6", SIZEOF_IDATA6, 0); 882 if (id6 == NULL) 883 goto error_return; 884 885 /* If necessary, trim the import symbol name. */ 886 symbol = symbol_name; 887 888 /* As used by MS compiler, '_', '@', and '?' are alternative 889 forms of USER_LABEL_PREFIX, with '?' for c++ mangled names, 890 '@' used for fastcall (in C), '_' everywhere else. Only one 891 of these is used for a symbol. We strip this leading char for 892 IMPORT_NAME_NOPREFIX and IMPORT_NAME_UNDECORATE as per the 893 PE COFF 6.0 spec (section 8.3, Import Name Type). */ 894 895 if (import_name_type != IMPORT_NAME) 896 { 897 char c = symbol[0]; 898 899 /* Check that we don't remove for targets with empty 900 USER_LABEL_PREFIX the leading underscore. */ 901 if ((c == '_' && abfd->xvec->symbol_leading_char != 0) 902 || c == '@' || c == '?') 903 symbol++; 904 } 905 906 len = strlen (symbol); 907 if (import_name_type == IMPORT_NAME_UNDECORATE) 908 { 909 /* Truncate at the first '@'. */ 910 char *at = strchr (symbol, '@'); 911 912 if (at != NULL) 913 len = at - symbol; 914 } 915 916 id6->contents[0] = ordinal & 0xff; 917 id6->contents[1] = ordinal >> 8; 918 919 memcpy ((char *) id6->contents + 2, symbol, len); 920 id6->contents[len + 2] = '\0'; 921 } 922 923 if (import_name_type != IMPORT_ORDINAL) 924 { 925 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_RVA, id6); 926 pe_ILF_save_relocs (&vars, id4); 927 928 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_RVA, id6); 929 pe_ILF_save_relocs (&vars, id5); 930 } 931 932 /* Create extra sections depending upon the type of import we are dealing with. */ 933 switch (import_type) 934 { 935 int i; 936 937 case IMPORT_CODE: 938 /* Create a .text section. 939 First we need to look up its contents in the jump table. */ 940 for (i = NUM_ENTRIES (jtab); i--;) 941 { 942 if (jtab[i].size == 0) 943 continue; 944 if (jtab[i].magic == magic) 945 break; 946 } 947 /* If we did not find a matching entry something is wrong. */ 948 if (i < 0) 949 abort (); 950 951 /* Create the .text section. */ 952 text = pe_ILF_make_a_section (& vars, ".text", jtab[i].size, SEC_CODE); 953 if (text == NULL) 954 goto error_return; 955 956 /* Copy in the jump code. */ 957 memcpy (text->contents, jtab[i].data, jtab[i].size); 958 959 /* Create an import symbol. */ 960 pe_ILF_make_a_symbol (& vars, "__imp_", symbol_name, id5, 0); 961 imp_sym = vars.sym_ptr_ptr - 1; 962 imp_index = vars.sym_index - 1; 963 964 /* Create a reloc for the data in the text section. */ 965 #ifdef MIPS_ARCH_MAGIC_WINCE 966 if (magic == MIPS_ARCH_MAGIC_WINCE) 967 { 968 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) 0, BFD_RELOC_HI16_S, 969 (struct bfd_symbol **) imp_sym, 970 imp_index); 971 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_LO16, text); 972 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) 4, BFD_RELOC_LO16, 973 (struct bfd_symbol **) imp_sym, 974 imp_index); 975 } 976 else 977 #endif 978 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) jtab[i].offset, 979 BFD_RELOC_32, (asymbol **) imp_sym, 980 imp_index); 981 982 pe_ILF_save_relocs (& vars, text); 983 break; 984 985 case IMPORT_DATA: 986 break; 987 988 default: 989 /* XXX code not yet written. */ 990 abort (); 991 } 992 993 /* Initialise the bfd. */ 994 memset (& internal_f, 0, sizeof (internal_f)); 995 996 internal_f.f_magic = magic; 997 internal_f.f_symptr = 0; 998 internal_f.f_nsyms = 0; 999 internal_f.f_flags = F_AR32WR | F_LNNO; /* XXX is this correct ? */ 1000 1001 if ( ! bfd_set_start_address (abfd, (bfd_vma) 0) 1002 || ! bfd_coff_set_arch_mach_hook (abfd, & internal_f)) 1003 goto error_return; 1004 1005 if (bfd_coff_mkobject_hook (abfd, (void *) & internal_f, NULL) == NULL) 1006 goto error_return; 1007 1008 coff_data (abfd)->pe = 1; 1009 #ifdef THUMBPEMAGIC 1010 if (vars.magic == THUMBPEMAGIC) 1011 /* Stop some linker warnings about thumb code not supporting interworking. */ 1012 coff_data (abfd)->flags |= F_INTERWORK | F_INTERWORK_SET; 1013 #endif 1014 1015 /* Switch from file contents to memory contents. */ 1016 bfd_cache_close (abfd); 1017 1018 abfd->iostream = (void *) vars.bim; 1019 abfd->flags |= BFD_IN_MEMORY /* | HAS_LOCALS */; 1020 abfd->iovec = &_bfd_memory_iovec; 1021 abfd->where = 0; 1022 abfd->origin = 0; 1023 obj_sym_filepos (abfd) = 0; 1024 1025 /* Now create a symbol describing the imported value. */ 1026 switch (import_type) 1027 { 1028 case IMPORT_CODE: 1029 pe_ILF_make_a_symbol (& vars, "", symbol_name, text, 1030 BSF_NOT_AT_END | BSF_FUNCTION); 1031 1032 /* Create an import symbol for the DLL, without the 1033 .dll suffix. */ 1034 ptr = (bfd_byte *) strrchr (source_dll, '.'); 1035 if (ptr) 1036 * ptr = 0; 1037 pe_ILF_make_a_symbol (& vars, "__IMPORT_DESCRIPTOR_", source_dll, NULL, 0); 1038 if (ptr) 1039 * ptr = '.'; 1040 break; 1041 1042 case IMPORT_DATA: 1043 /* Nothing to do here. */ 1044 break; 1045 1046 default: 1047 /* XXX code not yet written. */ 1048 abort (); 1049 } 1050 1051 /* Point the bfd at the symbol table. */ 1052 obj_symbols (abfd) = vars.sym_cache; 1053 bfd_get_symcount (abfd) = vars.sym_index; 1054 1055 obj_raw_syments (abfd) = vars.native_syms; 1056 obj_raw_syment_count (abfd) = vars.sym_index; 1057 1058 obj_coff_external_syms (abfd) = (void *) vars.esym_table; 1059 obj_coff_keep_syms (abfd) = TRUE; 1060 1061 obj_convert (abfd) = vars.sym_table; 1062 obj_conv_table_size (abfd) = vars.sym_index; 1063 1064 obj_coff_strings (abfd) = vars.string_table; 1065 obj_coff_keep_strings (abfd) = TRUE; 1066 1067 abfd->flags |= HAS_SYMS; 1068 1069 return TRUE; 1070 1071 error_return: 1072 if (vars.bim->buffer != NULL) 1073 free (vars.bim->buffer); 1074 free (vars.bim); 1075 return FALSE; 1076 } 1077 1078 /* We have detected a Image Library Format archive element. 1079 Decode the element and return the appropriate target. */ 1080 1081 static const bfd_target * 1082 pe_ILF_object_p (bfd * abfd) 1083 { 1084 bfd_byte buffer[14]; 1085 bfd_byte * ptr; 1086 char * symbol_name; 1087 char * source_dll; 1088 unsigned int machine; 1089 bfd_size_type size; 1090 unsigned int ordinal; 1091 unsigned int types; 1092 unsigned int magic; 1093 1094 /* Upon entry the first six bytes of the ILF header have 1095 already been read. Now read the rest of the header. */ 1096 if (bfd_bread (buffer, (bfd_size_type) 14, abfd) != 14) 1097 return NULL; 1098 1099 ptr = buffer; 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[6]; 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 /* First read the beginning of the header. */ 1264 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 1265 || bfd_bread (buffer, (bfd_size_type) 6, abfd) != 6) 1266 { 1267 if (bfd_get_error () != bfd_error_system_call) 1268 bfd_set_error (bfd_error_wrong_format); 1269 return NULL; 1270 } 1271 1272 /* Then check the magic and the version (only 0 is supported). */ 1273 if (H_GET_32 (abfd, buffer) == 0xffff0000 1274 && H_GET_16 (abfd, buffer + 4) == 0) 1275 return pe_ILF_object_p (abfd); 1276 1277 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 1278 || bfd_bread (&dos_hdr, (bfd_size_type) sizeof (dos_hdr), abfd) 1279 != sizeof (dos_hdr)) 1280 { 1281 if (bfd_get_error () != bfd_error_system_call) 1282 bfd_set_error (bfd_error_wrong_format); 1283 return NULL; 1284 } 1285 1286 /* There are really two magic numbers involved; the magic number 1287 that says this is a NT executable (PEI) and the magic number that 1288 determines the architecture. The former is DOSMAGIC, stored in 1289 the e_magic field. The latter is stored in the f_magic field. 1290 If the NT magic number isn't valid, the architecture magic number 1291 could be mimicked by some other field (specifically, the number 1292 of relocs in section 3). Since this routine can only be called 1293 correctly for a PEI file, check the e_magic number here, and, if 1294 it doesn't match, clobber the f_magic number so that we don't get 1295 a false match. */ 1296 if (H_GET_16 (abfd, dos_hdr.e_magic) != DOSMAGIC) 1297 { 1298 bfd_set_error (bfd_error_wrong_format); 1299 return NULL; 1300 } 1301 1302 offset = H_GET_32 (abfd, dos_hdr.e_lfanew); 1303 if (bfd_seek (abfd, offset, SEEK_SET) != 0 1304 || (bfd_bread (&image_hdr, (bfd_size_type) sizeof (image_hdr), abfd) 1305 != sizeof (image_hdr))) 1306 { 1307 if (bfd_get_error () != bfd_error_system_call) 1308 bfd_set_error (bfd_error_wrong_format); 1309 return NULL; 1310 } 1311 1312 if (H_GET_32 (abfd, image_hdr.nt_signature) != 0x4550) 1313 { 1314 bfd_set_error (bfd_error_wrong_format); 1315 return NULL; 1316 } 1317 1318 /* Swap file header, so that we get the location for calling 1319 real_object_p. */ 1320 bfd_coff_swap_filehdr_in (abfd, &image_hdr, &internal_f); 1321 1322 if (! bfd_coff_bad_format_hook (abfd, &internal_f) 1323 || internal_f.f_opthdr > bfd_coff_aoutsz (abfd)) 1324 { 1325 bfd_set_error (bfd_error_wrong_format); 1326 return NULL; 1327 } 1328 1329 /* Read the optional header, which has variable size. */ 1330 opt_hdr_size = internal_f.f_opthdr; 1331 1332 if (opt_hdr_size != 0) 1333 { 1334 bfd_size_type amt = opt_hdr_size; 1335 void * opthdr; 1336 1337 /* PR 17521 file: 230-131433-0.004. */ 1338 if (amt < sizeof (PEAOUTHDR)) 1339 amt = sizeof (PEAOUTHDR); 1340 1341 opthdr = bfd_zalloc (abfd, amt); 1342 if (opthdr == NULL) 1343 return NULL; 1344 if (bfd_bread (opthdr, opt_hdr_size, abfd) 1345 != (bfd_size_type) opt_hdr_size) 1346 return NULL; 1347 1348 bfd_coff_swap_aouthdr_in (abfd, opthdr, & internal_a); 1349 } 1350 1351 return coff_real_object_p (abfd, internal_f.f_nscns, &internal_f, 1352 (opt_hdr_size != 0 1353 ? &internal_a 1354 : (struct internal_aouthdr *) NULL)); 1355 } 1356 1357 #define coff_object_p pe_bfd_object_p 1358 #endif /* COFF_IMAGE_WITH_PE */ 1359
