peicode.h revision 1.1.1.1
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 (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 return TRUE; 276 } 277 278 /* Create the COFF backend specific information. */ 279 280 static void * 281 pe_mkobject_hook (bfd * abfd, 282 void * filehdr, 283 void * aouthdr ATTRIBUTE_UNUSED) 284 { 285 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr; 286 pe_data_type *pe; 287 288 if (! pe_mkobject (abfd)) 289 return NULL; 290 291 pe = pe_data (abfd); 292 pe->coff.sym_filepos = internal_f->f_symptr; 293 /* These members communicate important constants about the symbol 294 table to GDB's symbol-reading code. These `constants' 295 unfortunately vary among coff implementations... */ 296 pe->coff.local_n_btmask = N_BTMASK; 297 pe->coff.local_n_btshft = N_BTSHFT; 298 pe->coff.local_n_tmask = N_TMASK; 299 pe->coff.local_n_tshift = N_TSHIFT; 300 pe->coff.local_symesz = SYMESZ; 301 pe->coff.local_auxesz = AUXESZ; 302 pe->coff.local_linesz = LINESZ; 303 304 pe->coff.timestamp = internal_f->f_timdat; 305 306 obj_raw_syment_count (abfd) = 307 obj_conv_table_size (abfd) = 308 internal_f->f_nsyms; 309 310 pe->real_flags = internal_f->f_flags; 311 312 if ((internal_f->f_flags & F_DLL) != 0) 313 pe->dll = 1; 314 315 if ((internal_f->f_flags & IMAGE_FILE_DEBUG_STRIPPED) == 0) 316 abfd->flags |= HAS_DEBUG; 317 318 #ifdef COFF_IMAGE_WITH_PE 319 if (aouthdr) 320 pe->pe_opthdr = ((struct internal_aouthdr *) aouthdr)->pe; 321 #endif 322 323 #ifdef ARM 324 if (! _bfd_coff_arm_set_private_flags (abfd, internal_f->f_flags)) 325 coff_data (abfd) ->flags = 0; 326 #endif 327 328 return (void *) pe; 329 } 330 331 static bfd_boolean 332 pe_print_private_bfd_data (bfd *abfd, void * vfile) 333 { 334 FILE *file = (FILE *) vfile; 335 336 if (!_bfd_XX_print_private_bfd_data_common (abfd, vfile)) 337 return FALSE; 338 339 if (pe_saved_coff_bfd_print_private_bfd_data == NULL) 340 return TRUE; 341 342 fputc ('\n', file); 343 344 return pe_saved_coff_bfd_print_private_bfd_data (abfd, vfile); 345 } 346 347 /* Copy any private info we understand from the input bfd 348 to the output bfd. */ 349 350 static bfd_boolean 351 pe_bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 352 { 353 /* PR binutils/716: Copy the large address aware flag. 354 XXX: Should we be copying other flags or other fields in the pe_data() 355 structure ? */ 356 if (pe_data (obfd) != NULL 357 && pe_data (ibfd) != NULL 358 && pe_data (ibfd)->real_flags & IMAGE_FILE_LARGE_ADDRESS_AWARE) 359 pe_data (obfd)->real_flags |= IMAGE_FILE_LARGE_ADDRESS_AWARE; 360 361 if (!_bfd_XX_bfd_copy_private_bfd_data_common (ibfd, obfd)) 362 return FALSE; 363 364 if (pe_saved_coff_bfd_copy_private_bfd_data) 365 return pe_saved_coff_bfd_copy_private_bfd_data (ibfd, obfd); 366 367 return TRUE; 368 } 369 370 #define coff_bfd_copy_private_section_data \ 371 _bfd_XX_bfd_copy_private_section_data 372 373 #define coff_get_symbol_info _bfd_XX_get_symbol_info 374 375 #ifdef COFF_IMAGE_WITH_PE 376 377 /* Code to handle Microsoft's Image Library Format. 379 Also known as LINK6 format. 380 Documentation about this format can be found at: 381 382 http://msdn.microsoft.com/library/specs/pecoff_section8.htm */ 383 384 /* The following constants specify the sizes of the various data 385 structures that we have to create in order to build a bfd describing 386 an ILF object file. The final "+ 1" in the definitions of SIZEOF_IDATA6 387 and SIZEOF_IDATA7 below is to allow for the possibility that we might 388 need a padding byte in order to ensure 16 bit alignment for the section's 389 contents. 390 391 The value for SIZEOF_ILF_STRINGS is computed as follows: 392 393 There will be NUM_ILF_SECTIONS section symbols. Allow 9 characters 394 per symbol for their names (longest section name is .idata$x). 395 396 There will be two symbols for the imported value, one the symbol name 397 and one with _imp__ prefixed. Allowing for the terminating nul's this 398 is strlen (symbol_name) * 2 + 8 + 21 + strlen (source_dll). 399 400 The strings in the string table must start STRING__SIZE_SIZE bytes into 401 the table in order to for the string lookup code in coffgen/coffcode to 402 work. */ 403 #define NUM_ILF_RELOCS 8 404 #define NUM_ILF_SECTIONS 6 405 #define NUM_ILF_SYMS (2 + NUM_ILF_SECTIONS) 406 407 #define SIZEOF_ILF_SYMS (NUM_ILF_SYMS * sizeof (* vars.sym_cache)) 408 #define SIZEOF_ILF_SYM_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_table)) 409 #define SIZEOF_ILF_NATIVE_SYMS (NUM_ILF_SYMS * sizeof (* vars.native_syms)) 410 #define SIZEOF_ILF_SYM_PTR_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_ptr_table)) 411 #define SIZEOF_ILF_EXT_SYMS (NUM_ILF_SYMS * sizeof (* vars.esym_table)) 412 #define SIZEOF_ILF_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.reltab)) 413 #define SIZEOF_ILF_INT_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.int_reltab)) 414 #define SIZEOF_ILF_STRINGS (strlen (symbol_name) * 2 + 8 \ 415 + 21 + strlen (source_dll) \ 416 + NUM_ILF_SECTIONS * 9 \ 417 + STRING_SIZE_SIZE) 418 #define SIZEOF_IDATA2 (5 * 4) 419 420 /* For PEx64 idata4 & 5 have thumb size of 8 bytes. */ 421 #ifdef COFF_WITH_pex64 422 #define SIZEOF_IDATA4 (2 * 4) 423 #define SIZEOF_IDATA5 (2 * 4) 424 #else 425 #define SIZEOF_IDATA4 (1 * 4) 426 #define SIZEOF_IDATA5 (1 * 4) 427 #endif 428 429 #define SIZEOF_IDATA6 (2 + strlen (symbol_name) + 1 + 1) 430 #define SIZEOF_IDATA7 (strlen (source_dll) + 1 + 1) 431 #define SIZEOF_ILF_SECTIONS (NUM_ILF_SECTIONS * sizeof (struct coff_section_tdata)) 432 433 #define ILF_DATA_SIZE \ 434 + SIZEOF_ILF_SYMS \ 435 + SIZEOF_ILF_SYM_TABLE \ 436 + SIZEOF_ILF_NATIVE_SYMS \ 437 + SIZEOF_ILF_SYM_PTR_TABLE \ 438 + SIZEOF_ILF_EXT_SYMS \ 439 + SIZEOF_ILF_RELOCS \ 440 + SIZEOF_ILF_INT_RELOCS \ 441 + SIZEOF_ILF_STRINGS \ 442 + SIZEOF_IDATA2 \ 443 + SIZEOF_IDATA4 \ 444 + SIZEOF_IDATA5 \ 445 + SIZEOF_IDATA6 \ 446 + SIZEOF_IDATA7 \ 447 + SIZEOF_ILF_SECTIONS \ 448 + MAX_TEXT_SECTION_SIZE 449 450 /* Create an empty relocation against the given symbol. */ 451 452 static void 453 pe_ILF_make_a_symbol_reloc (pe_ILF_vars * vars, 454 bfd_vma address, 455 bfd_reloc_code_real_type reloc, 456 struct bfd_symbol ** sym, 457 unsigned int sym_index) 458 { 459 arelent * entry; 460 struct internal_reloc * internal; 461 462 entry = vars->reltab + vars->relcount; 463 internal = vars->int_reltab + vars->relcount; 464 465 entry->address = address; 466 entry->addend = 0; 467 entry->howto = bfd_reloc_type_lookup (vars->abfd, reloc); 468 entry->sym_ptr_ptr = sym; 469 470 internal->r_vaddr = address; 471 internal->r_symndx = sym_index; 472 internal->r_type = entry->howto->type; 473 474 vars->relcount ++; 475 476 BFD_ASSERT (vars->relcount <= NUM_ILF_RELOCS); 477 } 478 479 /* Create an empty relocation against the given section. */ 480 481 static void 482 pe_ILF_make_a_reloc (pe_ILF_vars * vars, 483 bfd_vma address, 484 bfd_reloc_code_real_type reloc, 485 asection_ptr sec) 486 { 487 pe_ILF_make_a_symbol_reloc (vars, address, reloc, sec->symbol_ptr_ptr, 488 coff_section_data (vars->abfd, sec)->i); 489 } 490 491 /* Move the queued relocs into the given section. */ 492 493 static void 494 pe_ILF_save_relocs (pe_ILF_vars * vars, 495 asection_ptr sec) 496 { 497 /* Make sure that there is somewhere to store the internal relocs. */ 498 if (coff_section_data (vars->abfd, sec) == NULL) 499 /* We should probably return an error indication here. */ 500 abort (); 501 502 coff_section_data (vars->abfd, sec)->relocs = vars->int_reltab; 503 coff_section_data (vars->abfd, sec)->keep_relocs = TRUE; 504 505 sec->relocation = vars->reltab; 506 sec->reloc_count = vars->relcount; 507 sec->flags |= SEC_RELOC; 508 509 vars->reltab += vars->relcount; 510 vars->int_reltab += vars->relcount; 511 vars->relcount = 0; 512 513 BFD_ASSERT ((bfd_byte *) vars->int_reltab < (bfd_byte *) vars->string_table); 514 } 515 516 /* Create a global symbol and add it to the relevant tables. */ 517 518 static void 519 pe_ILF_make_a_symbol (pe_ILF_vars * vars, 520 const char * prefix, 521 const char * symbol_name, 522 asection_ptr section, 523 flagword extra_flags) 524 { 525 coff_symbol_type * sym; 526 combined_entry_type * ent; 527 SYMENT * esym; 528 unsigned short sclass; 529 530 if (extra_flags & BSF_LOCAL) 531 sclass = C_STAT; 532 else 533 sclass = C_EXT; 534 535 #ifdef THUMBPEMAGIC 536 if (vars->magic == THUMBPEMAGIC) 537 { 538 if (extra_flags & BSF_FUNCTION) 539 sclass = C_THUMBEXTFUNC; 540 else if (extra_flags & BSF_LOCAL) 541 sclass = C_THUMBSTAT; 542 else 543 sclass = C_THUMBEXT; 544 } 545 #endif 546 547 BFD_ASSERT (vars->sym_index < NUM_ILF_SYMS); 548 549 sym = vars->sym_ptr; 550 ent = vars->native_ptr; 551 esym = vars->esym_ptr; 552 553 /* Copy the symbol's name into the string table. */ 554 sprintf (vars->string_ptr, "%s%s", prefix, symbol_name); 555 556 if (section == NULL) 557 section = bfd_und_section_ptr; 558 559 /* Initialise the external symbol. */ 560 H_PUT_32 (vars->abfd, vars->string_ptr - vars->string_table, 561 esym->e.e.e_offset); 562 H_PUT_16 (vars->abfd, section->target_index, esym->e_scnum); 563 esym->e_sclass[0] = sclass; 564 565 /* The following initialisations are unnecessary - the memory is 566 zero initialised. They are just kept here as reminders. */ 567 568 /* Initialise the internal symbol structure. */ 569 ent->u.syment.n_sclass = sclass; 570 ent->u.syment.n_scnum = section->target_index; 571 ent->u.syment._n._n_n._n_offset = (bfd_hostptr_t) sym; 572 573 sym->symbol.the_bfd = vars->abfd; 574 sym->symbol.name = vars->string_ptr; 575 sym->symbol.flags = BSF_EXPORT | BSF_GLOBAL | extra_flags; 576 sym->symbol.section = section; 577 sym->native = ent; 578 579 * vars->table_ptr = vars->sym_index; 580 * vars->sym_ptr_ptr = sym; 581 582 /* Adjust pointers for the next symbol. */ 583 vars->sym_index ++; 584 vars->sym_ptr ++; 585 vars->sym_ptr_ptr ++; 586 vars->table_ptr ++; 587 vars->native_ptr ++; 588 vars->esym_ptr ++; 589 vars->string_ptr += strlen (symbol_name) + strlen (prefix) + 1; 590 591 BFD_ASSERT (vars->string_ptr < vars->end_string_ptr); 592 } 593 594 /* Create a section. */ 595 596 static asection_ptr 597 pe_ILF_make_a_section (pe_ILF_vars * vars, 598 const char * name, 599 unsigned int size, 600 flagword extra_flags) 601 { 602 asection_ptr sec; 603 flagword flags; 604 605 sec = bfd_make_section_old_way (vars->abfd, name); 606 if (sec == NULL) 607 return NULL; 608 609 flags = SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_IN_MEMORY; 610 611 bfd_set_section_flags (vars->abfd, sec, flags | extra_flags); 612 613 (void) bfd_set_section_alignment (vars->abfd, sec, 2); 614 615 /* Check that we will not run out of space. */ 616 BFD_ASSERT (vars->data + size < vars->bim->buffer + vars->bim->size); 617 618 /* Set the section size and contents. The actual 619 contents are filled in by our parent. */ 620 bfd_set_section_size (vars->abfd, sec, (bfd_size_type) size); 621 sec->contents = vars->data; 622 sec->target_index = vars->sec_index ++; 623 624 /* Advance data pointer in the vars structure. */ 625 vars->data += size; 626 627 /* Skip the padding byte if it was not needed. 628 The logic here is that if the string length is odd, 629 then the entire string length, including the null byte, 630 is even and so the extra, padding byte, is not needed. */ 631 if (size & 1) 632 vars->data --; 633 634 /* Create a coff_section_tdata structure for our use. */ 635 sec->used_by_bfd = (struct coff_section_tdata *) vars->data; 636 vars->data += sizeof (struct coff_section_tdata); 637 638 BFD_ASSERT (vars->data <= vars->bim->buffer + vars->bim->size); 639 640 /* Create a symbol to refer to this section. */ 641 pe_ILF_make_a_symbol (vars, "", name, sec, BSF_LOCAL); 642 643 /* Cache the index to the symbol in the coff_section_data structure. */ 644 coff_section_data (vars->abfd, sec)->i = vars->sym_index - 1; 645 646 return sec; 647 } 648 649 /* This structure contains the code that goes into the .text section 650 in order to perform a jump into the DLL lookup table. The entries 651 in the table are index by the magic number used to represent the 652 machine type in the PE file. The contents of the data[] arrays in 653 these entries are stolen from the jtab[] arrays in ld/pe-dll.c. 654 The SIZE field says how many bytes in the DATA array are actually 655 used. The OFFSET field says where in the data array the address 656 of the .idata$5 section should be placed. */ 657 #define MAX_TEXT_SECTION_SIZE 32 658 659 typedef struct 660 { 661 unsigned short magic; 662 unsigned char data[MAX_TEXT_SECTION_SIZE]; 663 unsigned int size; 664 unsigned int offset; 665 } 666 jump_table; 667 668 static jump_table jtab[] = 669 { 670 #ifdef I386MAGIC 671 { I386MAGIC, 672 { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 }, 673 8, 2 674 }, 675 #endif 676 677 #ifdef AMD64MAGIC 678 { AMD64MAGIC, 679 { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 }, 680 8, 2 681 }, 682 #endif 683 684 #ifdef MC68MAGIC 685 { MC68MAGIC, 686 { /* XXX fill me in */ }, 687 0, 0 688 }, 689 #endif 690 691 #ifdef MIPS_ARCH_MAGIC_WINCE 692 { MIPS_ARCH_MAGIC_WINCE, 693 { 0x00, 0x00, 0x08, 0x3c, 0x00, 0x00, 0x08, 0x8d, 694 0x08, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00 }, 695 16, 0 696 }, 697 #endif 698 699 #ifdef SH_ARCH_MAGIC_WINCE 700 { SH_ARCH_MAGIC_WINCE, 701 { 0x01, 0xd0, 0x02, 0x60, 0x2b, 0x40, 702 0x09, 0x00, 0x00, 0x00, 0x00, 0x00 }, 703 12, 8 704 }, 705 #endif 706 707 #ifdef ARMPEMAGIC 708 { ARMPEMAGIC, 709 { 0x00, 0xc0, 0x9f, 0xe5, 0x00, 0xf0, 710 0x9c, 0xe5, 0x00, 0x00, 0x00, 0x00}, 711 12, 8 712 }, 713 #endif 714 715 #ifdef THUMBPEMAGIC 716 { THUMBPEMAGIC, 717 { 0x40, 0xb4, 0x02, 0x4e, 0x36, 0x68, 0xb4, 0x46, 718 0x40, 0xbc, 0x60, 0x47, 0x00, 0x00, 0x00, 0x00 }, 719 16, 12 720 }, 721 #endif 722 { 0, { 0 }, 0, 0 } 723 }; 724 725 #ifndef NUM_ENTRIES 726 #define NUM_ENTRIES(a) (sizeof (a) / sizeof (a)[0]) 727 #endif 728 729 /* Build a full BFD from the information supplied in a ILF object. */ 730 731 static bfd_boolean 732 pe_ILF_build_a_bfd (bfd * abfd, 733 unsigned int magic, 734 char * symbol_name, 735 char * source_dll, 736 unsigned int ordinal, 737 unsigned int types) 738 { 739 bfd_byte * ptr; 740 pe_ILF_vars vars; 741 struct internal_filehdr internal_f; 742 unsigned int import_type; 743 unsigned int import_name_type; 744 asection_ptr id4, id5, id6 = NULL, text = NULL; 745 coff_symbol_type ** imp_sym; 746 unsigned int imp_index; 747 748 /* Decode and verify the types field of the ILF structure. */ 749 import_type = types & 0x3; 750 import_name_type = (types & 0x1c) >> 2; 751 752 switch (import_type) 753 { 754 case IMPORT_CODE: 755 case IMPORT_DATA: 756 break; 757 758 case IMPORT_CONST: 759 /* XXX code yet to be written. */ 760 _bfd_error_handler (_("%B: Unhandled import type; %x"), 761 abfd, import_type); 762 return FALSE; 763 764 default: 765 _bfd_error_handler (_("%B: Unrecognised import type; %x"), 766 abfd, import_type); 767 return FALSE; 768 } 769 770 switch (import_name_type) 771 { 772 case IMPORT_ORDINAL: 773 case IMPORT_NAME: 774 case IMPORT_NAME_NOPREFIX: 775 case IMPORT_NAME_UNDECORATE: 776 break; 777 778 default: 779 _bfd_error_handler (_("%B: Unrecognised import name type; %x"), 780 abfd, import_name_type); 781 return FALSE; 782 } 783 784 /* Initialise local variables. 785 786 Note these are kept in a structure rather than being 787 declared as statics since bfd frowns on global variables. 788 789 We are going to construct the contents of the BFD in memory, 790 so allocate all the space that we will need right now. */ 791 vars.bim 792 = (struct bfd_in_memory *) bfd_malloc ((bfd_size_type) sizeof (*vars.bim)); 793 if (vars.bim == NULL) 794 return FALSE; 795 796 ptr = (bfd_byte *) bfd_zmalloc ((bfd_size_type) ILF_DATA_SIZE); 797 vars.bim->buffer = ptr; 798 vars.bim->size = ILF_DATA_SIZE; 799 if (ptr == NULL) 800 goto error_return; 801 802 /* Initialise the pointers to regions of the memory and the 803 other contents of the pe_ILF_vars structure as well. */ 804 vars.sym_cache = (coff_symbol_type *) ptr; 805 vars.sym_ptr = (coff_symbol_type *) ptr; 806 vars.sym_index = 0; 807 ptr += SIZEOF_ILF_SYMS; 808 809 vars.sym_table = (unsigned int *) ptr; 810 vars.table_ptr = (unsigned int *) ptr; 811 ptr += SIZEOF_ILF_SYM_TABLE; 812 813 vars.native_syms = (combined_entry_type *) ptr; 814 vars.native_ptr = (combined_entry_type *) ptr; 815 ptr += SIZEOF_ILF_NATIVE_SYMS; 816 817 vars.sym_ptr_table = (coff_symbol_type **) ptr; 818 vars.sym_ptr_ptr = (coff_symbol_type **) ptr; 819 ptr += SIZEOF_ILF_SYM_PTR_TABLE; 820 821 vars.esym_table = (SYMENT *) ptr; 822 vars.esym_ptr = (SYMENT *) ptr; 823 ptr += SIZEOF_ILF_EXT_SYMS; 824 825 vars.reltab = (arelent *) ptr; 826 vars.relcount = 0; 827 ptr += SIZEOF_ILF_RELOCS; 828 829 vars.int_reltab = (struct internal_reloc *) ptr; 830 ptr += SIZEOF_ILF_INT_RELOCS; 831 832 vars.string_table = (char *) ptr; 833 vars.string_ptr = (char *) ptr + STRING_SIZE_SIZE; 834 ptr += SIZEOF_ILF_STRINGS; 835 vars.end_string_ptr = (char *) ptr; 836 837 /* The remaining space in bim->buffer is used 838 by the pe_ILF_make_a_section() function. */ 839 vars.data = ptr; 840 vars.abfd = abfd; 841 vars.sec_index = 0; 842 vars.magic = magic; 843 844 /* Create the initial .idata$<n> sections: 845 [.idata$2: Import Directory Table -- not needed] 846 .idata$4: Import Lookup Table 847 .idata$5: Import Address Table 848 849 Note we do not create a .idata$3 section as this is 850 created for us by the linker script. */ 851 id4 = pe_ILF_make_a_section (& vars, ".idata$4", SIZEOF_IDATA4, 0); 852 id5 = pe_ILF_make_a_section (& vars, ".idata$5", SIZEOF_IDATA5, 0); 853 if (id4 == NULL || id5 == NULL) 854 goto error_return; 855 856 /* Fill in the contents of these sections. */ 857 if (import_name_type == IMPORT_ORDINAL) 858 { 859 if (ordinal == 0) 860 /* XXX - treat as IMPORT_NAME ??? */ 861 abort (); 862 863 #ifdef COFF_WITH_pex64 864 ((unsigned int *) id4->contents)[0] = ordinal; 865 ((unsigned int *) id4->contents)[1] = 0x80000000; 866 ((unsigned int *) id5->contents)[0] = ordinal; 867 ((unsigned int *) id5->contents)[1] = 0x80000000; 868 #else 869 * (unsigned int *) id4->contents = ordinal | 0x80000000; 870 * (unsigned int *) id5->contents = ordinal | 0x80000000; 871 #endif 872 } 873 else 874 { 875 char * symbol; 876 unsigned int len; 877 878 /* Create .idata$6 - the Hint Name Table. */ 879 id6 = pe_ILF_make_a_section (& vars, ".idata$6", SIZEOF_IDATA6, 0); 880 if (id6 == NULL) 881 goto error_return; 882 883 /* If necessary, trim the import symbol name. */ 884 symbol = symbol_name; 885 886 /* As used by MS compiler, '_', '@', and '?' are alternative 887 forms of USER_LABEL_PREFIX, with '?' for c++ mangled names, 888 '@' used for fastcall (in C), '_' everywhere else. Only one 889 of these is used for a symbol. We strip this leading char for 890 IMPORT_NAME_NOPREFIX and IMPORT_NAME_UNDECORATE as per the 891 PE COFF 6.0 spec (section 8.3, Import Name Type). */ 892 893 if (import_name_type != IMPORT_NAME) 894 { 895 char c = symbol[0]; 896 897 /* Check that we don't remove for targets with empty 898 USER_LABEL_PREFIX the leading underscore. */ 899 if ((c == '_' && abfd->xvec->symbol_leading_char != 0) 900 || c == '@' || c == '?') 901 symbol++; 902 } 903 904 len = strlen (symbol); 905 if (import_name_type == IMPORT_NAME_UNDECORATE) 906 { 907 /* Truncate at the first '@'. */ 908 char *at = strchr (symbol, '@'); 909 910 if (at != NULL) 911 len = at - symbol; 912 } 913 914 id6->contents[0] = ordinal & 0xff; 915 id6->contents[1] = ordinal >> 8; 916 917 memcpy ((char *) id6->contents + 2, symbol, len); 918 id6->contents[len + 2] = '\0'; 919 } 920 921 if (import_name_type != IMPORT_ORDINAL) 922 { 923 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_RVA, id6); 924 pe_ILF_save_relocs (&vars, id4); 925 926 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_RVA, id6); 927 pe_ILF_save_relocs (&vars, id5); 928 } 929 930 /* Create extra sections depending upon the type of import we are dealing with. */ 931 switch (import_type) 932 { 933 int i; 934 935 case IMPORT_CODE: 936 /* Create a .text section. 937 First we need to look up its contents in the jump table. */ 938 for (i = NUM_ENTRIES (jtab); i--;) 939 { 940 if (jtab[i].size == 0) 941 continue; 942 if (jtab[i].magic == magic) 943 break; 944 } 945 /* If we did not find a matching entry something is wrong. */ 946 if (i < 0) 947 abort (); 948 949 /* Create the .text section. */ 950 text = pe_ILF_make_a_section (& vars, ".text", jtab[i].size, SEC_CODE); 951 if (text == NULL) 952 goto error_return; 953 954 /* Copy in the jump code. */ 955 memcpy (text->contents, jtab[i].data, jtab[i].size); 956 957 /* Create an import symbol. */ 958 pe_ILF_make_a_symbol (& vars, "__imp_", symbol_name, id5, 0); 959 imp_sym = vars.sym_ptr_ptr - 1; 960 imp_index = vars.sym_index - 1; 961 962 /* Create a reloc for the data in the text section. */ 963 #ifdef MIPS_ARCH_MAGIC_WINCE 964 if (magic == MIPS_ARCH_MAGIC_WINCE) 965 { 966 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) 0, BFD_RELOC_HI16_S, 967 (struct bfd_symbol **) imp_sym, 968 imp_index); 969 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_LO16, text); 970 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) 4, BFD_RELOC_LO16, 971 (struct bfd_symbol **) imp_sym, 972 imp_index); 973 } 974 else 975 #endif 976 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) jtab[i].offset, 977 BFD_RELOC_32, (asymbol **) imp_sym, 978 imp_index); 979 980 pe_ILF_save_relocs (& vars, text); 981 break; 982 983 case IMPORT_DATA: 984 break; 985 986 default: 987 /* XXX code not yet written. */ 988 abort (); 989 } 990 991 /* Initialise the bfd. */ 992 memset (& internal_f, 0, sizeof (internal_f)); 993 994 internal_f.f_magic = magic; 995 internal_f.f_symptr = 0; 996 internal_f.f_nsyms = 0; 997 internal_f.f_flags = F_AR32WR | F_LNNO; /* XXX is this correct ? */ 998 999 if ( ! bfd_set_start_address (abfd, (bfd_vma) 0) 1000 || ! bfd_coff_set_arch_mach_hook (abfd, & internal_f)) 1001 goto error_return; 1002 1003 if (bfd_coff_mkobject_hook (abfd, (void *) & internal_f, NULL) == NULL) 1004 goto error_return; 1005 1006 coff_data (abfd)->pe = 1; 1007 #ifdef THUMBPEMAGIC 1008 if (vars.magic == THUMBPEMAGIC) 1009 /* Stop some linker warnings about thumb code not supporting interworking. */ 1010 coff_data (abfd)->flags |= F_INTERWORK | F_INTERWORK_SET; 1011 #endif 1012 1013 /* Switch from file contents to memory contents. */ 1014 bfd_cache_close (abfd); 1015 1016 abfd->iostream = (void *) vars.bim; 1017 abfd->flags |= BFD_IN_MEMORY /* | HAS_LOCALS */; 1018 abfd->iovec = &_bfd_memory_iovec; 1019 abfd->where = 0; 1020 abfd->origin = 0; 1021 obj_sym_filepos (abfd) = 0; 1022 1023 /* Now create a symbol describing the imported value. */ 1024 switch (import_type) 1025 { 1026 case IMPORT_CODE: 1027 pe_ILF_make_a_symbol (& vars, "", symbol_name, text, 1028 BSF_NOT_AT_END | BSF_FUNCTION); 1029 1030 /* Create an import symbol for the DLL, without the 1031 .dll suffix. */ 1032 ptr = (bfd_byte *) strrchr (source_dll, '.'); 1033 if (ptr) 1034 * ptr = 0; 1035 pe_ILF_make_a_symbol (& vars, "__IMPORT_DESCRIPTOR_", source_dll, NULL, 0); 1036 if (ptr) 1037 * ptr = '.'; 1038 break; 1039 1040 case IMPORT_DATA: 1041 /* Nothing to do here. */ 1042 break; 1043 1044 default: 1045 /* XXX code not yet written. */ 1046 abort (); 1047 } 1048 1049 /* Point the bfd at the symbol table. */ 1050 obj_symbols (abfd) = vars.sym_cache; 1051 bfd_get_symcount (abfd) = vars.sym_index; 1052 1053 obj_raw_syments (abfd) = vars.native_syms; 1054 obj_raw_syment_count (abfd) = vars.sym_index; 1055 1056 obj_coff_external_syms (abfd) = (void *) vars.esym_table; 1057 obj_coff_keep_syms (abfd) = TRUE; 1058 1059 obj_convert (abfd) = vars.sym_table; 1060 obj_conv_table_size (abfd) = vars.sym_index; 1061 1062 obj_coff_strings (abfd) = vars.string_table; 1063 obj_coff_keep_strings (abfd) = TRUE; 1064 1065 abfd->flags |= HAS_SYMS; 1066 1067 return TRUE; 1068 1069 error_return: 1070 if (vars.bim->buffer != NULL) 1071 free (vars.bim->buffer); 1072 free (vars.bim); 1073 return FALSE; 1074 } 1075 1076 /* We have detected a Image Library Format archive element. 1077 Decode the element and return the appropriate target. */ 1078 1079 static const bfd_target * 1080 pe_ILF_object_p (bfd * abfd) 1081 { 1082 bfd_byte buffer[16]; 1083 bfd_byte * ptr; 1084 char * symbol_name; 1085 char * source_dll; 1086 unsigned int machine; 1087 bfd_size_type size; 1088 unsigned int ordinal; 1089 unsigned int types; 1090 unsigned int magic; 1091 1092 /* Upon entry the first four buyes of the ILF header have 1093 already been read. Now read the rest of the header. */ 1094 if (bfd_bread (buffer, (bfd_size_type) 16, abfd) != 16) 1095 return NULL; 1096 1097 ptr = buffer; 1098 1099 /* We do not bother to check the version number. 1100 version = H_GET_16 (abfd, ptr); */ 1101 ptr += 2; 1102 1103 machine = H_GET_16 (abfd, ptr); 1104 ptr += 2; 1105 1106 /* Check that the machine type is recognised. */ 1107 magic = 0; 1108 1109 switch (machine) 1110 { 1111 case IMAGE_FILE_MACHINE_UNKNOWN: 1112 case IMAGE_FILE_MACHINE_ALPHA: 1113 case IMAGE_FILE_MACHINE_ALPHA64: 1114 case IMAGE_FILE_MACHINE_IA64: 1115 break; 1116 1117 case IMAGE_FILE_MACHINE_I386: 1118 #ifdef I386MAGIC 1119 magic = I386MAGIC; 1120 #endif 1121 break; 1122 1123 case IMAGE_FILE_MACHINE_AMD64: 1124 #ifdef AMD64MAGIC 1125 magic = AMD64MAGIC; 1126 #endif 1127 break; 1128 1129 case IMAGE_FILE_MACHINE_M68K: 1130 #ifdef MC68AGIC 1131 magic = MC68MAGIC; 1132 #endif 1133 break; 1134 1135 case IMAGE_FILE_MACHINE_R3000: 1136 case IMAGE_FILE_MACHINE_R4000: 1137 case IMAGE_FILE_MACHINE_R10000: 1138 1139 case IMAGE_FILE_MACHINE_MIPS16: 1140 case IMAGE_FILE_MACHINE_MIPSFPU: 1141 case IMAGE_FILE_MACHINE_MIPSFPU16: 1142 #ifdef MIPS_ARCH_MAGIC_WINCE 1143 magic = MIPS_ARCH_MAGIC_WINCE; 1144 #endif 1145 break; 1146 1147 case IMAGE_FILE_MACHINE_SH3: 1148 case IMAGE_FILE_MACHINE_SH4: 1149 #ifdef SH_ARCH_MAGIC_WINCE 1150 magic = SH_ARCH_MAGIC_WINCE; 1151 #endif 1152 break; 1153 1154 case IMAGE_FILE_MACHINE_ARM: 1155 #ifdef ARMPEMAGIC 1156 magic = ARMPEMAGIC; 1157 #endif 1158 break; 1159 1160 case IMAGE_FILE_MACHINE_THUMB: 1161 #ifdef THUMBPEMAGIC 1162 { 1163 extern const bfd_target TARGET_LITTLE_SYM; 1164 1165 if (abfd->xvec == & TARGET_LITTLE_SYM) 1166 magic = THUMBPEMAGIC; 1167 } 1168 #endif 1169 break; 1170 1171 case IMAGE_FILE_MACHINE_POWERPC: 1172 /* We no longer support PowerPC. */ 1173 default: 1174 _bfd_error_handler 1175 (_("%B: Unrecognised machine type (0x%x)" 1176 " in Import Library Format archive"), 1177 abfd, machine); 1178 bfd_set_error (bfd_error_malformed_archive); 1179 1180 return NULL; 1181 break; 1182 } 1183 1184 if (magic == 0) 1185 { 1186 _bfd_error_handler 1187 (_("%B: Recognised but unhandled machine type (0x%x)" 1188 " in Import Library Format archive"), 1189 abfd, machine); 1190 bfd_set_error (bfd_error_wrong_format); 1191 1192 return NULL; 1193 } 1194 1195 /* We do not bother to check the date. 1196 date = H_GET_32 (abfd, ptr); */ 1197 ptr += 4; 1198 1199 size = H_GET_32 (abfd, ptr); 1200 ptr += 4; 1201 1202 if (size == 0) 1203 { 1204 _bfd_error_handler 1205 (_("%B: size field is zero in Import Library Format header"), abfd); 1206 bfd_set_error (bfd_error_malformed_archive); 1207 1208 return NULL; 1209 } 1210 1211 ordinal = H_GET_16 (abfd, ptr); 1212 ptr += 2; 1213 1214 types = H_GET_16 (abfd, ptr); 1215 /* ptr += 2; */ 1216 1217 /* Now read in the two strings that follow. */ 1218 ptr = (bfd_byte *) bfd_alloc (abfd, size); 1219 if (ptr == NULL) 1220 return NULL; 1221 1222 if (bfd_bread (ptr, size, abfd) != size) 1223 { 1224 bfd_release (abfd, ptr); 1225 return NULL; 1226 } 1227 1228 symbol_name = (char *) ptr; 1229 source_dll = symbol_name + strlen (symbol_name) + 1; 1230 1231 /* Verify that the strings are null terminated. */ 1232 if (ptr[size - 1] != 0 1233 || (bfd_size_type) ((bfd_byte *) source_dll - ptr) >= size) 1234 { 1235 _bfd_error_handler 1236 (_("%B: string not null terminated in ILF object file."), abfd); 1237 bfd_set_error (bfd_error_malformed_archive); 1238 bfd_release (abfd, ptr); 1239 return NULL; 1240 } 1241 1242 /* Now construct the bfd. */ 1243 if (! pe_ILF_build_a_bfd (abfd, magic, symbol_name, 1244 source_dll, ordinal, types)) 1245 { 1246 bfd_release (abfd, ptr); 1247 return NULL; 1248 } 1249 1250 return abfd->xvec; 1251 } 1252 1253 static const bfd_target * 1254 pe_bfd_object_p (bfd * abfd) 1255 { 1256 bfd_byte buffer[4]; 1257 struct external_PEI_DOS_hdr dos_hdr; 1258 struct external_PEI_IMAGE_hdr image_hdr; 1259 struct internal_filehdr internal_f; 1260 struct internal_aouthdr internal_a; 1261 file_ptr opt_hdr_size; 1262 file_ptr offset; 1263 1264 /* Detect if this a Microsoft Import Library Format element. */ 1265 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 1266 || bfd_bread (buffer, (bfd_size_type) 4, abfd) != 4) 1267 { 1268 if (bfd_get_error () != bfd_error_system_call) 1269 bfd_set_error (bfd_error_wrong_format); 1270 return NULL; 1271 } 1272 1273 if (H_GET_32 (abfd, buffer) == 0xffff0000) 1274 return pe_ILF_object_p (abfd); 1275 1276 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 1277 || bfd_bread (&dos_hdr, (bfd_size_type) sizeof (dos_hdr), abfd) 1278 != sizeof (dos_hdr)) 1279 { 1280 if (bfd_get_error () != bfd_error_system_call) 1281 bfd_set_error (bfd_error_wrong_format); 1282 return NULL; 1283 } 1284 1285 /* There are really two magic numbers involved; the magic number 1286 that says this is a NT executable (PEI) and the magic number that 1287 determines the architecture. The former is DOSMAGIC, stored in 1288 the e_magic field. The latter is stored in the f_magic field. 1289 If the NT magic number isn't valid, the architecture magic number 1290 could be mimicked by some other field (specifically, the number 1291 of relocs in section 3). Since this routine can only be called 1292 correctly for a PEI file, check the e_magic number here, and, if 1293 it doesn't match, clobber the f_magic number so that we don't get 1294 a false match. */ 1295 if (H_GET_16 (abfd, dos_hdr.e_magic) != DOSMAGIC) 1296 { 1297 bfd_set_error (bfd_error_wrong_format); 1298 return NULL; 1299 } 1300 1301 offset = H_GET_32 (abfd, dos_hdr.e_lfanew); 1302 if (bfd_seek (abfd, offset, SEEK_SET) != 0 1303 || (bfd_bread (&image_hdr, (bfd_size_type) sizeof (image_hdr), abfd) 1304 != sizeof (image_hdr))) 1305 { 1306 if (bfd_get_error () != bfd_error_system_call) 1307 bfd_set_error (bfd_error_wrong_format); 1308 return NULL; 1309 } 1310 1311 if (H_GET_32 (abfd, image_hdr.nt_signature) != 0x4550) 1312 { 1313 bfd_set_error (bfd_error_wrong_format); 1314 return NULL; 1315 } 1316 1317 /* Swap file header, so that we get the location for calling 1318 real_object_p. */ 1319 bfd_coff_swap_filehdr_in (abfd, (PTR)&image_hdr, &internal_f); 1320 1321 if (! bfd_coff_bad_format_hook (abfd, &internal_f) 1322 || internal_f.f_opthdr > bfd_coff_aoutsz (abfd)) 1323 { 1324 bfd_set_error (bfd_error_wrong_format); 1325 return NULL; 1326 } 1327 1328 /* Read the optional header, which has variable size. */ 1329 opt_hdr_size = internal_f.f_opthdr; 1330 1331 if (opt_hdr_size != 0) 1332 { 1333 PTR opthdr; 1334 1335 opthdr = bfd_alloc (abfd, opt_hdr_size); 1336 if (opthdr == NULL) 1337 return NULL; 1338 if (bfd_bread (opthdr, opt_hdr_size, abfd) 1339 != (bfd_size_type) opt_hdr_size) 1340 return NULL; 1341 1342 bfd_coff_swap_aouthdr_in (abfd, opthdr, (PTR) & internal_a); 1343 } 1344 1345 return coff_real_object_p (abfd, internal_f.f_nscns, &internal_f, 1346 (opt_hdr_size != 0 1347 ? &internal_a 1348 : (struct internal_aouthdr *) NULL)); 1349 } 1350 1351 #define coff_object_p pe_bfd_object_p 1352 #endif /* COFF_IMAGE_WITH_PE */ 1353
Indexes created Sat Feb 28 05:31:39 UTC 2026