source: trunk/src/binutils/bfd/peicode.h@ 83

Last change on this file since 83 was 10, checked in by bird, 23 years ago

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1/* Support for the generic parts of PE/PEI, for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4 Written by Cygnus Solutions.
5
6This file is part of BFD, the Binary File Descriptor library.
7
8This program is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2 of the License, or
11(at your option) any later version.
12
13This program is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with this program; if not, write to the Free Software
20Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22/*
23Most of this hacked by Steve Chamberlain,
24 sac@cygnus.com
25
26PE/PEI rearrangement (and code added): Donn Terry
27 Softway Systems, Inc.
28*/
29
30/* Hey look, some documentation [and in a place you expect to find it]!
31
32 The main reference for the pei format is "Microsoft Portable Executable
33 and Common Object File Format Specification 4.1". Get it if you need to
34 do some serious hacking on this code.
35
36 Another reference:
37 "Peering Inside the PE: A Tour of the Win32 Portable Executable
38 File Format", MSJ 1994, Volume 9.
39
40 The *sole* difference between the pe format and the pei format is that the
41 latter has an MSDOS 2.0 .exe header on the front that prints the message
42 "This app must be run under Windows." (or some such).
43 (FIXME: Whether that statement is *really* true or not is unknown.
44 Are there more subtle differences between pe and pei formats?
45 For now assume there aren't. If you find one, then for God sakes
46 document it here!)
47
48 The Microsoft docs use the word "image" instead of "executable" because
49 the former can also refer to a DLL (shared library). Confusion can arise
50 because the `i' in `pei' also refers to "image". The `pe' format can
51 also create images (i.e. executables), it's just that to run on a win32
52 system you need to use the pei format.
53
54 FIXME: Please add more docs here so the next poor fool that has to hack
55 on this code has a chance of getting something accomplished without
56 wasting too much time.
57*/
58
59#include "libpei.h"
60
61static boolean (*pe_saved_coff_bfd_print_private_bfd_data)
62 PARAMS ((bfd *, PTR)) =
63#ifndef coff_bfd_print_private_bfd_data
64 NULL;
65#else
66 coff_bfd_print_private_bfd_data;
67#undef coff_bfd_print_private_bfd_data
68#endif
69
70static boolean pe_print_private_bfd_data PARAMS ((bfd *, PTR));
71#define coff_bfd_print_private_bfd_data pe_print_private_bfd_data
72
73static boolean (*pe_saved_coff_bfd_copy_private_bfd_data)
74 PARAMS ((bfd *, bfd *)) =
75#ifndef coff_bfd_copy_private_bfd_data
76 NULL;
77#else
78 coff_bfd_copy_private_bfd_data;
79#undef coff_bfd_copy_private_bfd_data
80#endif
81
82static boolean pe_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *));
83#define coff_bfd_copy_private_bfd_data pe_bfd_copy_private_bfd_data
84
85#define coff_mkobject pe_mkobject
86#define coff_mkobject_hook pe_mkobject_hook
87
88#ifndef NO_COFF_RELOCS
89static void coff_swap_reloc_in PARAMS ((bfd *, PTR, PTR));
90static unsigned int coff_swap_reloc_out PARAMS ((bfd *, PTR, PTR));
91#endif
92static void coff_swap_filehdr_in PARAMS ((bfd *, PTR, PTR));
93static void coff_swap_scnhdr_in PARAMS ((bfd *, PTR, PTR));
94static boolean pe_mkobject PARAMS ((bfd *));
95static PTR pe_mkobject_hook PARAMS ((bfd *, PTR, PTR));
96
97#ifdef COFF_IMAGE_WITH_PE
98/* This structure contains static variables used by the ILF code. */
99typedef asection * asection_ptr;
100
101typedef struct
102{
103 bfd * abfd;
104 bfd_byte * data;
105 struct bfd_in_memory * bim;
106 unsigned short magic;
107
108 arelent * reltab;
109 unsigned int relcount;
110
111 coff_symbol_type * sym_cache;
112 coff_symbol_type * sym_ptr;
113 unsigned int sym_index;
114
115 unsigned int * sym_table;
116 unsigned int * table_ptr;
117
118 combined_entry_type * native_syms;
119 combined_entry_type * native_ptr;
120
121 coff_symbol_type ** sym_ptr_table;
122 coff_symbol_type ** sym_ptr_ptr;
123
124 unsigned int sec_index;
125
126 char * string_table;
127 char * string_ptr;
128 char * end_string_ptr;
129
130 SYMENT * esym_table;
131 SYMENT * esym_ptr;
132
133 struct internal_reloc * int_reltab;
134}
135pe_ILF_vars;
136
137static asection_ptr pe_ILF_make_a_section PARAMS ((pe_ILF_vars *, const char *, unsigned int, flagword));
138static void pe_ILF_make_a_reloc PARAMS ((pe_ILF_vars *, bfd_vma, bfd_reloc_code_real_type, asection_ptr));
139static void pe_ILF_make_a_symbol PARAMS ((pe_ILF_vars *, const char *, const char *, asection_ptr, flagword));
140static void pe_ILF_save_relocs PARAMS ((pe_ILF_vars *, asection_ptr));
141static void pe_ILF_make_a_symbol_reloc PARAMS ((pe_ILF_vars *, bfd_vma, bfd_reloc_code_real_type, struct symbol_cache_entry **, unsigned int));
142static boolean pe_ILF_build_a_bfd PARAMS ((bfd *, unsigned short, bfd_byte *, bfd_byte *, unsigned int, unsigned int));
143static const bfd_target * pe_ILF_object_p PARAMS ((bfd *));
144static const bfd_target * pe_bfd_object_p PARAMS ((bfd *));
145#endif /* COFF_IMAGE_WITH_PE */
146
147/**********************************************************************/
148
149#ifndef NO_COFF_RELOCS
150static void
151coff_swap_reloc_in (abfd, src, dst)
152 bfd *abfd;
153 PTR src;
154 PTR dst;
155{
156 RELOC *reloc_src = (RELOC *) src;
157 struct internal_reloc *reloc_dst = (struct internal_reloc *) dst;
158
159 reloc_dst->r_vaddr = bfd_h_get_32(abfd, (bfd_byte *)reloc_src->r_vaddr);
160 reloc_dst->r_symndx = bfd_h_get_signed_32(abfd, (bfd_byte *) reloc_src->r_symndx);
161
162 reloc_dst->r_type = bfd_h_get_16(abfd, (bfd_byte *) reloc_src->r_type);
163
164#ifdef SWAP_IN_RELOC_OFFSET
165 reloc_dst->r_offset = SWAP_IN_RELOC_OFFSET(abfd,
166 (bfd_byte *) reloc_src->r_offset);
167#endif
168}
169
170static unsigned int
171coff_swap_reloc_out (abfd, src, dst)
172 bfd *abfd;
173 PTR src;
174 PTR dst;
175{
176 struct internal_reloc *reloc_src = (struct internal_reloc *)src;
177 struct external_reloc *reloc_dst = (struct external_reloc *)dst;
178 bfd_h_put_32(abfd, reloc_src->r_vaddr, (bfd_byte *) reloc_dst->r_vaddr);
179 bfd_h_put_32(abfd, reloc_src->r_symndx, (bfd_byte *) reloc_dst->r_symndx);
180
181 bfd_h_put_16(abfd, reloc_src->r_type, (bfd_byte *)
182 reloc_dst->r_type);
183
184#ifdef SWAP_OUT_RELOC_OFFSET
185 SWAP_OUT_RELOC_OFFSET(abfd,
186 reloc_src->r_offset,
187 (bfd_byte *) reloc_dst->r_offset);
188#endif
189#ifdef SWAP_OUT_RELOC_EXTRA
190 SWAP_OUT_RELOC_EXTRA(abfd,reloc_src, reloc_dst);
191#endif
192 return RELSZ;
193}
194#endif /* not NO_COFF_RELOCS */
195
196static void
197coff_swap_filehdr_in (abfd, src, dst)
198 bfd *abfd;
199 PTR src;
200 PTR dst;
201{
202 FILHDR *filehdr_src = (FILHDR *) src;
203 struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst;
204 filehdr_dst->f_magic = bfd_h_get_16(abfd, (bfd_byte *) filehdr_src->f_magic);
205 filehdr_dst->f_nscns = bfd_h_get_16(abfd, (bfd_byte *)filehdr_src-> f_nscns);
206 filehdr_dst->f_timdat = bfd_h_get_32(abfd, (bfd_byte *)filehdr_src-> f_timdat);
207
208 filehdr_dst->f_nsyms = bfd_h_get_32(abfd, (bfd_byte *)filehdr_src-> f_nsyms);
209 filehdr_dst->f_flags = bfd_h_get_16(abfd, (bfd_byte *)filehdr_src-> f_flags);
210 filehdr_dst->f_symptr = bfd_h_get_32 (abfd, (bfd_byte *) filehdr_src->f_symptr);
211
212 /* Other people's tools sometimes generate headers with an nsyms but
213 a zero symptr. */
214 if (filehdr_dst->f_nsyms != 0 && filehdr_dst->f_symptr == 0)
215 {
216 filehdr_dst->f_nsyms = 0;
217 filehdr_dst->f_flags |= F_LSYMS;
218 }
219
220 filehdr_dst->f_opthdr = bfd_h_get_16(abfd,
221 (bfd_byte *)filehdr_src-> f_opthdr);
222}
223
224#ifdef COFF_IMAGE_WITH_PE
225# define coff_swap_filehdr_out _bfd_XXi_only_swap_filehdr_out
226#else
227# define coff_swap_filehdr_out _bfd_pe_only_swap_filehdr_out
228#endif
229
230static void
231coff_swap_scnhdr_in (abfd, ext, in)
232 bfd *abfd;
233 PTR ext;
234 PTR in;
235{
236 SCNHDR *scnhdr_ext = (SCNHDR *) ext;
237 struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in;
238
239 memcpy(scnhdr_int->s_name, scnhdr_ext->s_name, sizeof (scnhdr_int->s_name));
240 scnhdr_int->s_vaddr =
241 GET_SCNHDR_VADDR (abfd, (bfd_byte *) scnhdr_ext->s_vaddr);
242 scnhdr_int->s_paddr =
243 GET_SCNHDR_PADDR (abfd, (bfd_byte *) scnhdr_ext->s_paddr);
244 scnhdr_int->s_size =
245 GET_SCNHDR_SIZE (abfd, (bfd_byte *) scnhdr_ext->s_size);
246 scnhdr_int->s_scnptr =
247 GET_SCNHDR_SCNPTR (abfd, (bfd_byte *) scnhdr_ext->s_scnptr);
248 scnhdr_int->s_relptr =
249 GET_SCNHDR_RELPTR (abfd, (bfd_byte *) scnhdr_ext->s_relptr);
250 scnhdr_int->s_lnnoptr =
251 GET_SCNHDR_LNNOPTR (abfd, (bfd_byte *) scnhdr_ext->s_lnnoptr);
252 scnhdr_int->s_flags = bfd_h_get_32(abfd, (bfd_byte *) scnhdr_ext->s_flags);
253
254 /* MS handles overflow of line numbers by carrying into the reloc
255 field (it appears). Since it's supposed to be zero for PE
256 *IMAGE* format, that's safe. This is still a bit iffy. */
257#ifdef COFF_IMAGE_WITH_PE
258 scnhdr_int->s_nlnno =
259 (bfd_h_get_16 (abfd, (bfd_byte *) scnhdr_ext->s_nlnno)
260 + (bfd_h_get_16 (abfd, (bfd_byte *) scnhdr_ext->s_nreloc) << 16));
261 scnhdr_int->s_nreloc = 0;
262#else
263 scnhdr_int->s_nreloc = bfd_h_get_16 (abfd,
264 (bfd_byte *) scnhdr_ext->s_nreloc);
265 scnhdr_int->s_nlnno = bfd_h_get_16 (abfd,
266 (bfd_byte *) scnhdr_ext->s_nlnno);
267#endif
268
269 if (scnhdr_int->s_vaddr != 0)
270 {
271 scnhdr_int->s_vaddr += pe_data (abfd)->pe_opthdr.ImageBase;
272 scnhdr_int->s_vaddr &= 0xffffffff;
273 }
274
275#ifndef COFF_NO_HACK_SCNHDR_SIZE
276 /* If this section holds uninitialized data, use the virtual size
277 (stored in s_paddr) instead of the physical size. */
278 if ((scnhdr_int->s_flags & IMAGE_SCN_CNT_UNINITIALIZED_DATA) != 0)
279 {
280 scnhdr_int->s_size = scnhdr_int->s_paddr;
281 /* This code used to set scnhdr_int->s_paddr to 0. However,
282 coff_set_alignment_hook stores s_paddr in virt_size, which
283 only works if it correctly holds the virtual size of the
284 section. */
285 }
286#endif
287}
288
289static boolean
290pe_mkobject (abfd)
291 bfd * abfd;
292{
293 pe_data_type *pe;
294 abfd->tdata.pe_obj_data =
295 (struct pe_tdata *) bfd_zalloc (abfd, sizeof (pe_data_type));
296
297 if (abfd->tdata.pe_obj_data == 0)
298 return false;
299
300 pe = pe_data (abfd);
301
302 pe->coff.pe = 1;
303
304 /* in_reloc_p is architecture dependent. */
305 pe->in_reloc_p = in_reloc_p;
306
307#ifdef PEI_FORCE_MINIMUM_ALIGNMENT
308 pe->force_minimum_alignment = 1;
309#endif
310#ifdef PEI_TARGET_SUBSYSTEM
311 pe->target_subsystem = PEI_TARGET_SUBSYSTEM;
312#endif
313
314 return true;
315}
316
317/* Create the COFF backend specific information. */
318static PTR
319pe_mkobject_hook (abfd, filehdr, aouthdr)
320 bfd * abfd;
321 PTR filehdr;
322 PTR aouthdr ATTRIBUTE_UNUSED;
323{
324 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
325 pe_data_type *pe;
326
327 if (pe_mkobject (abfd) == false)
328 return NULL;
329
330 pe = pe_data (abfd);
331 pe->coff.sym_filepos = internal_f->f_symptr;
332 /* These members communicate important constants about the symbol
333 table to GDB's symbol-reading code. These `constants'
334 unfortunately vary among coff implementations... */
335 pe->coff.local_n_btmask = N_BTMASK;
336 pe->coff.local_n_btshft = N_BTSHFT;
337 pe->coff.local_n_tmask = N_TMASK;
338 pe->coff.local_n_tshift = N_TSHIFT;
339 pe->coff.local_symesz = SYMESZ;
340 pe->coff.local_auxesz = AUXESZ;
341 pe->coff.local_linesz = LINESZ;
342
343 pe->coff.timestamp = internal_f->f_timdat;
344
345 obj_raw_syment_count (abfd) =
346 obj_conv_table_size (abfd) =
347 internal_f->f_nsyms;
348
349 pe->real_flags = internal_f->f_flags;
350
351 if ((internal_f->f_flags & F_DLL) != 0)
352 pe->dll = 1;
353
354 if ((internal_f->f_flags & IMAGE_FILE_DEBUG_STRIPPED) == 0)
355 abfd->flags |= HAS_DEBUG;
356
357#ifdef COFF_IMAGE_WITH_PE
358 if (aouthdr)
359 pe->pe_opthdr = ((struct internal_aouthdr *)aouthdr)->pe;
360#endif
361
362#ifdef ARM
363 if (! _bfd_coff_arm_set_private_flags (abfd, internal_f->f_flags))
364 coff_data (abfd) ->flags = 0;
365#endif
366
367 return (PTR) pe;
368}
369
370static boolean
371pe_print_private_bfd_data (abfd, vfile)
372 bfd *abfd;
373 PTR vfile;
374{
375 FILE *file = (FILE *) vfile;
376
377 if (!_bfd_XX_print_private_bfd_data_common (abfd, vfile))
378 return false;
379
380 if (pe_saved_coff_bfd_print_private_bfd_data != NULL)
381 {
382 fputc ('\n', file);
383
384 return pe_saved_coff_bfd_print_private_bfd_data (abfd, vfile);
385 }
386
387 return true;
388}
389
390/* Copy any private info we understand from the input bfd
391 to the output bfd. */
392
393static boolean
394pe_bfd_copy_private_bfd_data (ibfd, obfd)
395 bfd *ibfd, *obfd;
396{
397 if (!_bfd_XX_bfd_copy_private_bfd_data_common (ibfd, obfd))
398 return false;
399
400 if (pe_saved_coff_bfd_copy_private_bfd_data)
401 return pe_saved_coff_bfd_copy_private_bfd_data (ibfd, obfd);
402
403 return true;
404}
405
406#define coff_bfd_copy_private_section_data \
407 _bfd_XX_bfd_copy_private_section_data
408
409#define coff_get_symbol_info _bfd_XX_get_symbol_info
410
411#ifdef COFF_IMAGE_WITH_PE
412
413
414/* Code to handle Microsoft's Image Library Format.
415 Also known as LINK6 format.
416 Documentation about this format can be found at:
417
418 http://msdn.microsoft.com/library/specs/pecoff_section8.htm */
419
420/* The following constants specify the sizes of the various data
421 structures that we have to create in order to build a bfd describing
422 an ILF object file. The final "+ 1" in the definitions of SIZEOF_IDATA6
423 and SIZEOF_IDATA7 below is to allow for the possibility that we might
424 need a padding byte in order to ensure 16 bit alignment for the section's
425 contents.
426
427 The value for SIZEOF_ILF_STRINGS is computed as follows:
428
429 There will be NUM_ILF_SECTIONS section symbols. Allow 9 characters
430 per symbol for their names (longest section name is .idata$x).
431
432 There will be two symbols for the imported value, one the symbol name
433 and one with _imp__ prefixed. Allowing for the terminating nul's this
434 is strlen (symbol_name) * 2 + 8 + 21 + strlen (source_dll).
435
436 The strings in the string table must start STRING__SIZE_SIZE bytes into
437 the table in order to for the string lookup code in coffgen/coffcode to
438 work. */
439#define NUM_ILF_RELOCS 8
440#define NUM_ILF_SECTIONS 6
441#define NUM_ILF_SYMS (2 + NUM_ILF_SECTIONS)
442
443#define SIZEOF_ILF_SYMS (NUM_ILF_SYMS * sizeof (* vars.sym_cache))
444#define SIZEOF_ILF_SYM_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_table))
445#define SIZEOF_ILF_NATIVE_SYMS (NUM_ILF_SYMS * sizeof (* vars.native_syms))
446#define SIZEOF_ILF_SYM_PTR_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_ptr_table))
447#define SIZEOF_ILF_EXT_SYMS (NUM_ILF_SYMS * sizeof (* vars.esym_table))
448#define SIZEOF_ILF_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.reltab))
449#define SIZEOF_ILF_INT_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.int_reltab))
450#define SIZEOF_ILF_STRINGS (strlen (symbol_name) * 2 + 8 \
451 + 21 + strlen (source_dll) \
452 + NUM_ILF_SECTIONS * 9 \
453 + STRING_SIZE_SIZE)
454#define SIZEOF_IDATA2 (5 * 4)
455#define SIZEOF_IDATA4 (1 * 4)
456#define SIZEOF_IDATA5 (1 * 4)
457#define SIZEOF_IDATA6 (2 + strlen (symbol_name) + 1 + 1)
458#define SIZEOF_IDATA7 (strlen (source_dll) + 1 + 1)
459#define SIZEOF_ILF_SECTIONS (NUM_ILF_SECTIONS * sizeof (struct coff_section_tdata))
460
461#define ILF_DATA_SIZE \
462 sizeof (* vars.bim) \
463 + SIZEOF_ILF_SYMS \
464 + SIZEOF_ILF_SYM_TABLE \
465 + SIZEOF_ILF_NATIVE_SYMS \
466 + SIZEOF_ILF_SYM_PTR_TABLE \
467 + SIZEOF_ILF_EXT_SYMS \
468 + SIZEOF_ILF_RELOCS \
469 + SIZEOF_ILF_INT_RELOCS \
470 + SIZEOF_ILF_STRINGS \
471 + SIZEOF_IDATA2 \
472 + SIZEOF_IDATA4 \
473 + SIZEOF_IDATA5 \
474 + SIZEOF_IDATA6 \
475 + SIZEOF_IDATA7 \
476 + SIZEOF_ILF_SECTIONS \
477 + MAX_TEXT_SECTION_SIZE
478
479/* Create an empty relocation against the given symbol. */
480static void
481pe_ILF_make_a_symbol_reloc (pe_ILF_vars * vars,
482 bfd_vma address,
483 bfd_reloc_code_real_type reloc,
484 struct symbol_cache_entry ** sym,
485 unsigned int sym_index)
486{
487 arelent * entry;
488 struct internal_reloc * internal;
489
490 entry = vars->reltab + vars->relcount;
491 internal = vars->int_reltab + vars->relcount;
492
493 entry->address = address;
494 entry->addend = 0;
495 entry->howto = bfd_reloc_type_lookup (vars->abfd, reloc);
496 entry->sym_ptr_ptr = sym;
497
498 internal->r_vaddr = address;
499 internal->r_symndx = sym_index;
500 internal->r_type = entry->howto->type;
501#if 0 /* These fields do not need to be initialised. */
502 internal->r_size = 0;
503 internal->r_extern = 0;
504 internal->r_offset = 0;
505#endif
506
507 vars->relcount ++;
508
509 BFD_ASSERT (vars->relcount <= NUM_ILF_RELOCS);
510}
511
512/* Create an empty relocation against the given section. */
513static void
514pe_ILF_make_a_reloc (pe_ILF_vars * vars,
515 bfd_vma address,
516 bfd_reloc_code_real_type reloc,
517 asection_ptr sec)
518{
519 pe_ILF_make_a_symbol_reloc (vars, address, reloc, sec->symbol_ptr_ptr,
520 coff_section_data (vars->abfd, sec)->i);
521}
522
523/* Move the queued relocs into the given section. */
524static void
525pe_ILF_save_relocs (pe_ILF_vars * vars,
526 asection_ptr sec)
527{
528 /* Make sure that there is somewhere to store the internal relocs. */
529 if (coff_section_data (vars->abfd, sec) == NULL)
530 /* We should probably return an error indication here. */
531 abort ();
532
533 coff_section_data (vars->abfd, sec)->relocs = vars->int_reltab;
534 coff_section_data (vars->abfd, sec)->keep_relocs = true;
535
536 sec->relocation = vars->reltab;
537 sec->reloc_count = vars->relcount;
538 sec->flags |= SEC_RELOC;
539
540 vars->reltab += vars->relcount;
541 vars->int_reltab += vars->relcount;
542 vars->relcount = 0;
543
544 BFD_ASSERT ((bfd_byte *)vars->int_reltab < (bfd_byte *)vars->string_table);
545}
546
547/* Create a global symbol and add it to the relevant tables. */
548static void
549pe_ILF_make_a_symbol (pe_ILF_vars * vars,
550 const char * prefix,
551 const char * symbol_name,
552 asection_ptr section,
553 flagword extra_flags)
554{
555 coff_symbol_type * sym;
556 combined_entry_type * ent;
557 SYMENT * esym;
558 unsigned short sclass;
559
560 if (extra_flags & BSF_LOCAL)
561 sclass = C_STAT;
562 else
563 sclass = C_EXT;
564
565#ifdef THUMBPEMAGIC
566 if (vars->magic == THUMBPEMAGIC)
567 {
568 if (extra_flags & BSF_FUNCTION)
569 sclass = C_THUMBEXTFUNC;
570 else if (extra_flags & BSF_LOCAL)
571 sclass = C_THUMBSTAT;
572 else
573 sclass = C_THUMBEXT;
574 }
575#endif
576
577 BFD_ASSERT (vars->sym_index < NUM_ILF_SYMS);
578
579 sym = vars->sym_ptr;
580 ent = vars->native_ptr;
581 esym = vars->esym_ptr;
582
583 /* Copy the symbol's name into the string table. */
584 sprintf (vars->string_ptr, "%s%s", prefix, symbol_name);
585
586 if (section == NULL)
587 section = (asection_ptr) & bfd_und_section;
588
589 /* Initialise the external symbol. */
590 bfd_h_put_32 (vars->abfd, vars->string_ptr - vars->string_table, (bfd_byte *) esym->e.e.e_offset);
591 bfd_h_put_16 (vars->abfd, section->target_index, (bfd_byte *) esym->e_scnum);
592 esym->e_sclass[0] = sclass;
593
594 /* The following initialisations are unnecessary - the memory is
595 zero initialised. They are just kept here as reminders. */
596#if 0
597 esym->e.e.e_zeroes = 0;
598 esym->e_value = 0;
599 esym->e_type = T_NULL;
600 esym->e_numaux = 0;
601#endif
602
603 /* Initialise the internal symbol structure. */
604 ent->u.syment.n_sclass = sclass;
605 ent->u.syment.n_scnum = section->target_index;
606 ent->u.syment._n._n_n._n_offset = (long) sym;
607
608#if 0 /* See comment above. */
609 ent->u.syment.n_value = 0;
610 ent->u.syment.n_flags = 0;
611 ent->u.syment.n_type = T_NULL;
612 ent->u.syment.n_numaux = 0;
613 ent->fix_value = 0;
614#endif
615
616 sym->symbol.the_bfd = vars->abfd;
617 sym->symbol.name = vars->string_ptr;
618 sym->symbol.flags = BSF_EXPORT | BSF_GLOBAL | extra_flags;
619 sym->symbol.section = section;
620 sym->native = ent;
621
622#if 0 /* See comment above. */
623 sym->symbol.value = 0;
624 sym->symbol.udata.i = 0;
625 sym->done_lineno = false;
626 sym->lineno = NULL;
627#endif
628
629 * vars->table_ptr = vars->sym_index;
630 * vars->sym_ptr_ptr = sym;
631
632 /* Adjust pointers for the next symbol. */
633 vars->sym_index ++;
634 vars->sym_ptr ++;
635 vars->sym_ptr_ptr ++;
636 vars->table_ptr ++;
637 vars->native_ptr ++;
638 vars->esym_ptr ++;
639 vars->string_ptr += strlen (symbol_name) + strlen (prefix) + 1;
640
641 BFD_ASSERT (vars->string_ptr < vars->end_string_ptr);
642}
643
644/* Create a section. */
645static asection_ptr
646pe_ILF_make_a_section (pe_ILF_vars * vars,
647 const char * name,
648 unsigned int size,
649 flagword extra_flags)
650{
651 asection_ptr sec;
652 flagword flags;
653
654 sec = bfd_make_section_old_way (vars->abfd, name);
655 if (sec == NULL)
656 return NULL;
657
658 flags = SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_IN_MEMORY;
659
660 bfd_set_section_flags (vars->abfd, sec, flags | extra_flags);
661
662 bfd_set_section_alignment (vars->abfd, sec, 2);
663
664 /* Check that we will not run out of space. */
665 BFD_ASSERT (vars->data + size < vars->bim->buffer + vars->bim->size);
666
667 /* Set the section size and contents. The actual
668 contents are filled in by our parent. */
669 bfd_set_section_size (vars->abfd, sec, size);
670 sec->contents = vars->data;
671 sec->target_index = vars->sec_index ++;
672
673 /* Advance data pointer in the vars structure. */
674 vars->data += size;
675
676 /* Skip the padding byte if it was not needed.
677 The logic here is that if the string length is odd,
678 then the entire string length, including the null byte,
679 is even and so the extra, padding byte, is not needed. */
680 if (size & 1)
681 vars->data --;
682
683 /* Create a coff_section_tdata structure for our use. */
684 sec->used_by_bfd = (struct coff_section_tdata *) vars->data;
685 vars->data += sizeof (struct coff_section_tdata);
686
687 BFD_ASSERT (vars->data <= vars->bim->buffer + vars->bim->size);
688
689 /* Create a symbol to refer to this section. */
690 pe_ILF_make_a_symbol (vars, "", name, sec, BSF_LOCAL);
691
692 /* Cache the index to the symbol in the coff_section_data structure. */
693 coff_section_data (vars->abfd, sec)->i = vars->sym_index - 1;
694
695 return sec;
696}
697
698/* This structure contains the code that goes into the .text section
699 in order to perform a jump into the DLL lookup table. The entries
700 in the table are index by the magic number used to represent the
701 machine type in the PE file. The contents of the data[] arrays in
702 these entries are stolen from the jtab[] arrays in ld/pe-dll.c.
703 The SIZE field says how many bytes in the DATA array are actually
704 used. The OFFSET field says where in the data array the address
705 of the .idata$5 section should be placed. */
706#define MAX_TEXT_SECTION_SIZE 32
707
708typedef struct
709{
710 unsigned short magic;
711 unsigned char data[MAX_TEXT_SECTION_SIZE];
712 unsigned int size;
713 unsigned int offset;
714}
715jump_table;
716
717static jump_table jtab[] =
718{
719#ifdef I386MAGIC
720 { I386MAGIC,
721 { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 },
722 8, 2
723 },
724#endif
725
726#ifdef MC68MAGIC
727 { MC68MAGIC, { /* XXX fill me in */ }, 0, 0 },
728#endif
729#ifdef MIPS_ARCH_MAGIC_WINCE
730 { MIPS_ARCH_MAGIC_WINCE,
731 { 0x00, 0x00, 0x08, 0x3c, 0x00, 0x00, 0x08, 0x8d,
732 0x08, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00 },
733 16, 0
734 },
735#endif
736
737#ifdef SH_ARCH_MAGIC_WINCE
738 { SH_ARCH_MAGIC_WINCE,
739 { 0x01, 0xd0, 0x02, 0x60, 0x2b, 0x40,
740 0x09, 0x00, 0x00, 0x00, 0x00, 0x00 },
741 12, 8
742 },
743#endif
744
745#ifdef ARMPEMAGIC
746 { ARMPEMAGIC,
747 { 0x00, 0xc0, 0x9f, 0xe5, 0x00, 0xf0,
748 0x9c, 0xe5, 0x00, 0x00, 0x00, 0x00},
749 12, 8
750 },
751#endif
752
753#ifdef THUMBPEMAGIC
754 { THUMBPEMAGIC,
755 { 0x40, 0xb4, 0x02, 0x4e, 0x36, 0x68, 0xb4, 0x46,
756 0x40, 0xbc, 0x60, 0x47, 0x00, 0x00, 0x00, 0x00 },
757 16, 12
758 },
759#endif
760 { 0, { 0 }, 0, 0 }
761};
762
763#ifndef NUM_ENTRIES
764#define NUM_ENTRIES(a) (sizeof (a) / sizeof (a)[0])
765#endif
766
767/* Build a full BFD from the information supplied in a ILF object. */
768static boolean
769pe_ILF_build_a_bfd (bfd * abfd,
770 unsigned short magic,
771 bfd_byte * symbol_name,
772 bfd_byte * source_dll,
773 unsigned int ordinal,
774 unsigned int types)
775{
776 bfd_byte * ptr;
777 pe_ILF_vars vars;
778 struct internal_filehdr internal_f;
779 unsigned int import_type;
780 unsigned int import_name_type;
781 asection_ptr id4, id5, id6 = NULL, text = NULL;
782 coff_symbol_type ** imp_sym;
783 unsigned int imp_index;
784
785 /* Decode and verify the types field of the ILF structure. */
786 import_type = types & 0x3;
787 import_name_type = (types & 0x1c) >> 2;
788
789 switch (import_type)
790 {
791 case IMPORT_CODE:
792 case IMPORT_DATA:
793 break;
794
795 case IMPORT_CONST:
796 /* XXX code yet to be written. */
797 _bfd_error_handler (_("%s: Unhandled import type; %x"),
798 bfd_get_filename (abfd), import_type);
799 return false;
800
801 default:
802 _bfd_error_handler (_("%s: Unrecognised import type; %x"),
803 bfd_get_filename (abfd), import_type);
804 return false;
805 }
806
807 switch (import_name_type)
808 {
809 case IMPORT_ORDINAL:
810 case IMPORT_NAME:
811 case IMPORT_NAME_NOPREFIX:
812 case IMPORT_NAME_UNDECORATE:
813 break;
814
815 default:
816 _bfd_error_handler (_("%s: Unrecognised import name type; %x"),
817 bfd_get_filename (abfd), import_name_type);
818 return false;
819 }
820
821 /* Initialise local variables.
822
823 Note these are kept in a structure rather than being
824 declared as statics since bfd frowns on global variables.
825
826 We are going to construct the contents of the BFD in memory,
827 so allocate all the space that we will need right now. */
828 ptr = bfd_zalloc (abfd, ILF_DATA_SIZE);
829 if (ptr == NULL)
830 return false;
831
832 /* Create a bfd_in_memory structure. */
833 vars.bim = (struct bfd_in_memory *) ptr;
834 vars.bim->buffer = ptr;
835 vars.bim->size = ILF_DATA_SIZE;
836 ptr += sizeof (* vars.bim);
837
838 /* Initialise the pointers to regions of the memory and the
839 other contents of the pe_ILF_vars structure as well. */
840 vars.sym_cache = (coff_symbol_type *) ptr;
841 vars.sym_ptr = (coff_symbol_type *) ptr;
842 vars.sym_index = 0;
843 ptr += SIZEOF_ILF_SYMS;
844
845 vars.sym_table = (unsigned int *) ptr;
846 vars.table_ptr = (unsigned int *) ptr;
847 ptr += SIZEOF_ILF_SYM_TABLE;
848
849 vars.native_syms = (combined_entry_type *) ptr;
850 vars.native_ptr = (combined_entry_type *) ptr;
851 ptr += SIZEOF_ILF_NATIVE_SYMS;
852
853 vars.sym_ptr_table = (coff_symbol_type **) ptr;
854 vars.sym_ptr_ptr = (coff_symbol_type **) ptr;
855 ptr += SIZEOF_ILF_SYM_PTR_TABLE;
856
857 vars.esym_table = (SYMENT *) ptr;
858 vars.esym_ptr = (SYMENT *) ptr;
859 ptr += SIZEOF_ILF_EXT_SYMS;
860
861 vars.reltab = (arelent *) ptr;
862 vars.relcount = 0;
863 ptr += SIZEOF_ILF_RELOCS;
864
865 vars.int_reltab = (struct internal_reloc *) ptr;
866 ptr += SIZEOF_ILF_INT_RELOCS;
867
868 vars.string_table = ptr;
869 vars.string_ptr = ptr + STRING_SIZE_SIZE;
870 ptr += SIZEOF_ILF_STRINGS;
871 vars.end_string_ptr = ptr;
872
873 /* The remaining space in bim->buffer is used
874 by the pe_ILF_make_a_section() function. */
875 vars.data = ptr;
876 vars.abfd = abfd;
877 vars.sec_index = 0;
878 vars.magic = magic;
879
880 /* Create the initial .idata$<n> sections:
881 [.idata$2: Import Directory Table -- not needed]
882 .idata$4: Import Lookup Table
883 .idata$5: Import Address Table
884
885 Note we do not create a .idata$3 section as this is
886 created for us by the linker script. */
887 id4 = pe_ILF_make_a_section (& vars, ".idata$4", SIZEOF_IDATA4, 0);
888 id5 = pe_ILF_make_a_section (& vars, ".idata$5", SIZEOF_IDATA5, 0);
889 if (id4 == NULL || id5 == NULL)
890 return false;
891
892 /* Fill in the contents of these sections. */
893 if (import_name_type == IMPORT_ORDINAL)
894 {
895 if (ordinal == 0)
896 /* XXX - treat as IMPORT_NAME ??? */
897 abort ();
898
899 * (unsigned int *) id4->contents = ordinal | 0x80000000;
900 * (unsigned int *) id5->contents = ordinal | 0x80000000;
901 }
902 else
903 {
904 char * symbol;
905
906 /* Create .idata$6 - the Hint Name Table. */
907 id6 = pe_ILF_make_a_section (& vars, ".idata$6", SIZEOF_IDATA6, 0);
908 if (id6 == NULL)
909 return false;
910
911 /* If necessary, trim the import symbol name. */
912 symbol = symbol_name;
913
914 if (import_name_type != IMPORT_NAME)
915 /* Skip any prefix in symbol_name. */
916 while (*symbol == '@' || * symbol == '?' || * symbol == '_')
917 ++ symbol;
918
919 if (import_name_type == IMPORT_NAME_UNDECORATE)
920 {
921 /* Truncate at the first '@' */
922 while (* symbol != 0 && * symbol != '@')
923 symbol ++;
924
925 * symbol = 0;
926 }
927
928 id6->contents[0] = ordinal & 0xff;
929 id6->contents[1] = ordinal >> 8;
930
931 strcpy (id6->contents + 2, symbol);
932 }
933
934 if (import_name_type != IMPORT_ORDINAL)
935 {
936 pe_ILF_make_a_reloc (& vars, 0, BFD_RELOC_RVA, id6);
937 pe_ILF_save_relocs (& vars, id4);
938
939 pe_ILF_make_a_reloc (& vars, 0, BFD_RELOC_RVA, id6);
940 pe_ILF_save_relocs (& vars, id5);
941 }
942
943 /* Create extra sections depending upon the type of import we are dealing with. */
944 switch (import_type)
945 {
946 int i;
947
948 case IMPORT_CODE:
949 /* Create a .text section.
950 First we need to look up its contents in the jump table. */
951 for (i = NUM_ENTRIES (jtab); i--;)
952 {
953 if (jtab[i].size == 0)
954 continue;
955 if (jtab[i].magic == magic)
956 break;
957 }
958 /* If we did not find a matching entry something is wrong. */
959 if (i < 0)
960 abort ();
961
962 /* Create the .text section. */
963 text = pe_ILF_make_a_section (& vars, ".text", jtab[i].size, SEC_CODE);
964 if (text == NULL)
965 return false;
966
967 /* Copy in the jump code. */
968 memcpy (text->contents, jtab[i].data, jtab[i].size);
969
970 /* Create an import symbol. */
971 pe_ILF_make_a_symbol (& vars, "__imp_", symbol_name, id5, 0);
972 imp_sym = vars.sym_ptr_ptr - 1;
973 imp_index = vars.sym_index - 1;
974
975 /* Create a reloc for the data in the text section. */
976#ifdef MIPS_ARCH_MAGIC_WINCE
977 if (magic == MIPS_ARCH_MAGIC_WINCE)
978 {
979 pe_ILF_make_a_symbol_reloc (& vars, 0, BFD_RELOC_HI16_S,
980 (struct symbol_cache_entry **) imp_sym, imp_index);
981 pe_ILF_make_a_reloc (& vars, 0, BFD_RELOC_LO16, text);
982 pe_ILF_make_a_symbol_reloc (& vars, 4, BFD_RELOC_LO16,
983 (struct symbol_cache_entry **) imp_sym, imp_index);
984 }
985 else
986#endif
987 pe_ILF_make_a_symbol_reloc (& vars, jtab[i].offset, BFD_RELOC_32,
988 (asymbol **) imp_sym, imp_index);
989
990 pe_ILF_save_relocs (& vars, text);
991 break;
992
993 case IMPORT_DATA:
994 break;
995
996 default:
997 /* XXX code not yet written. */
998 abort ();
999 }
1000
1001 /* Initialise the bfd. */
1002 memset (& internal_f, 0, sizeof (internal_f));
1003
1004 internal_f.f_magic = magic;
1005 internal_f.f_symptr = 0;
1006 internal_f.f_nsyms = 0;
1007 internal_f.f_flags = F_AR32WR | F_LNNO; /* XXX is this correct ? */
1008
1009 if ( ! bfd_set_start_address (abfd, 0)
1010 || ! bfd_coff_set_arch_mach_hook (abfd, & internal_f))
1011 return false;
1012
1013 if (bfd_coff_mkobject_hook (abfd, (PTR) & internal_f, NULL) == NULL)
1014 return false;
1015
1016 coff_data (abfd)->pe = 1;
1017#ifdef THUMBPEMAGIC
1018 if (vars.magic == THUMBPEMAGIC)
1019 /* Stop some linker warnings about thumb code not supporting interworking. */
1020 coff_data (abfd)->flags |= F_INTERWORK | F_INTERWORK_SET;
1021#endif
1022
1023 /* Switch from file contents to memory contents. */
1024 bfd_cache_close (abfd);
1025
1026 abfd->iostream = (PTR) vars.bim;
1027 abfd->flags |= BFD_IN_MEMORY /* | HAS_LOCALS */;
1028 abfd->where = 0;
1029 obj_sym_filepos (abfd) = 0;
1030
1031 /* Now create a symbol describing the imported value. */
1032 switch (import_type)
1033 {
1034 bfd_byte * ptr;
1035
1036 case IMPORT_CODE:
1037 pe_ILF_make_a_symbol (& vars, "", symbol_name, text,
1038 BSF_NOT_AT_END | BSF_FUNCTION);
1039
1040 /* Create an import symbol for the DLL, without the
1041 .dll suffix. */
1042 ptr = strrchr (source_dll, '.');
1043 if (ptr)
1044 * ptr = 0;
1045 pe_ILF_make_a_symbol (& vars, "__IMPORT_DESCRIPTOR_", source_dll, NULL, 0);
1046 if (ptr)
1047 * ptr = '.';
1048 break;
1049
1050 case IMPORT_DATA:
1051 /* Nothing to do here. */
1052 break;
1053
1054 default:
1055 /* XXX code not yet written. */
1056 abort ();
1057 }
1058
1059 /* Point the bfd at the symbol table. */
1060 obj_symbols (abfd) = vars.sym_cache;
1061 bfd_get_symcount (abfd) = vars.sym_index;
1062
1063 obj_raw_syments (abfd) = vars.native_syms;
1064 obj_raw_syment_count (abfd) = vars.sym_index;
1065
1066 obj_coff_external_syms (abfd) = (PTR) vars.esym_table;
1067 obj_coff_keep_syms (abfd) = true;
1068
1069 obj_convert (abfd) = vars.sym_table;
1070 obj_conv_table_size (abfd) = vars.sym_index;
1071
1072 obj_coff_strings (abfd) = vars.string_table;
1073 obj_coff_keep_strings (abfd) = true;
1074
1075 abfd->flags |= HAS_SYMS;
1076
1077 return true;
1078}
1079
1080/* We have detected a Image Library Format archive element.
1081 Decode the element and return the appropriate target. */
1082static const bfd_target *
1083pe_ILF_object_p (bfd * abfd)
1084{
1085 bfd_byte buffer[16];
1086 bfd_byte * ptr;
1087 bfd_byte * symbol_name;
1088 bfd_byte * source_dll;
1089 unsigned int machine;
1090 unsigned long size;
1091 unsigned int ordinal;
1092 unsigned int types;
1093 unsigned short magic;
1094
1095 /* Upon entry the first four buyes of the ILF header have
1096 already been read. Now read the rest of the header. */
1097 if (bfd_read (buffer, 1, 16, abfd) != 16)
1098 return NULL;
1099
1100 ptr = buffer;
1101
1102 /* We do not bother to check the version number.
1103 version = bfd_h_get_16 (abfd, ptr); */
1104 ptr += 2;
1105
1106 machine = bfd_h_get_16 (abfd, ptr);
1107 ptr += 2;
1108
1109 /* Check that the machine type is recognised. */
1110 magic = 0;
1111
1112 switch (machine)
1113 {
1114 case IMAGE_FILE_MACHINE_UNKNOWN:
1115 case IMAGE_FILE_MACHINE_ALPHA:
1116 case IMAGE_FILE_MACHINE_ALPHA64:
1117 case IMAGE_FILE_MACHINE_IA64:
1118 break;
1119
1120 case IMAGE_FILE_MACHINE_I386:
1121#ifdef I386MAGIC
1122 magic = I386MAGIC;
1123#endif
1124 break;
1125
1126 case IMAGE_FILE_MACHINE_M68K:
1127#ifdef MC68AGIC
1128 magic = MC68MAGIC;
1129#endif
1130 break;
1131
1132 case IMAGE_FILE_MACHINE_R3000:
1133 case IMAGE_FILE_MACHINE_R4000:
1134 case IMAGE_FILE_MACHINE_R10000:
1135
1136 case IMAGE_FILE_MACHINE_MIPS16:
1137 case IMAGE_FILE_MACHINE_MIPSFPU:
1138 case IMAGE_FILE_MACHINE_MIPSFPU16:
1139#ifdef MIPS_ARCH_MAGIC_WINCE
1140 magic = MIPS_ARCH_MAGIC_WINCE;
1141#endif
1142 break;
1143
1144 case IMAGE_FILE_MACHINE_SH3:
1145 case IMAGE_FILE_MACHINE_SH4:
1146#ifdef SH_ARCH_MAGIC_WINCE
1147 magic = SH_ARCH_MAGIC_WINCE;
1148#endif
1149 break;
1150
1151 case IMAGE_FILE_MACHINE_ARM:
1152#ifdef ARMPEMAGIC
1153 magic = ARMPEMAGIC;
1154#endif
1155 break;
1156
1157 case IMAGE_FILE_MACHINE_THUMB:
1158#ifdef THUMBPEMAGIC
1159 {
1160 extern const bfd_target TARGET_LITTLE_SYM;
1161
1162 if (abfd->xvec == & TARGET_LITTLE_SYM)
1163 magic = THUMBPEMAGIC;
1164 }
1165#endif
1166 break;
1167
1168 case IMAGE_FILE_MACHINE_POWERPC:
1169 /* We no longer support PowerPC. */
1170 default:
1171 _bfd_error_handler
1172 (
1173_("%s: Unrecognised machine type (0x%x) in Import Library Format archive"),
1174 bfd_get_filename (abfd), machine);
1175 bfd_set_error (bfd_error_malformed_archive);
1176
1177 return NULL;
1178 break;
1179 }
1180
1181 if (magic == 0)
1182 {
1183 _bfd_error_handler
1184 (
1185_("%s: Recognised but unhandled machine type (0x%x) in Import Library Format archive"),
1186 bfd_get_filename (abfd), machine);
1187 bfd_set_error (bfd_error_wrong_format);
1188
1189 return NULL;
1190 }
1191
1192 /* We do not bother to check the date.
1193 date = bfd_h_get_32 (abfd, ptr); */
1194 ptr += 4;
1195
1196 size = bfd_h_get_32 (abfd, ptr);
1197 ptr += 4;
1198
1199 if (size == 0)
1200 {
1201 _bfd_error_handler
1202 (_("%s: size field is zero in Import Library Format header"),
1203 bfd_get_filename (abfd));
1204 bfd_set_error (bfd_error_malformed_archive);
1205
1206 return NULL;
1207 }
1208
1209 ordinal = bfd_h_get_16 (abfd, ptr);
1210 ptr += 2;
1211
1212 types = bfd_h_get_16 (abfd, ptr);
1213 /* ptr += 2; */
1214
1215 /* Now read in the two strings that follow. */
1216 ptr = bfd_alloc (abfd, size);
1217 if (ptr == NULL)
1218 return NULL;
1219
1220 if (bfd_read (ptr, 1, size, abfd) != size)
1221 return NULL;
1222
1223 symbol_name = ptr;
1224 source_dll = ptr + strlen (ptr) + 1;
1225
1226 /* Verify that the strings are null terminated. */
1227 if (ptr[size - 1] != 0 || ((unsigned long) (source_dll - ptr) >= size))
1228 {
1229 _bfd_error_handler
1230 (_("%s: string not null terminated in ILF object file."),
1231 bfd_get_filename (abfd));
1232 bfd_set_error (bfd_error_malformed_archive);
1233
1234 return NULL;
1235 }
1236
1237 /* Now construct the bfd. */
1238 if (! pe_ILF_build_a_bfd (abfd, magic, symbol_name,
1239 source_dll, ordinal, types))
1240 return NULL;
1241
1242 return abfd->xvec;
1243}
1244
1245static const bfd_target *
1246pe_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, 0x00, SEEK_SET) != 0
1255 || bfd_read (buffer, 1, 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 (bfd_h_get_32 (abfd, buffer) == 0xffff0000)
1263 return pe_ILF_object_p (abfd);
1264
1265 if (bfd_seek (abfd, 0x00, SEEK_SET) != 0
1266 || bfd_read (&dos_hdr, 1, 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 (bfd_h_get_16 (abfd, (bfd_byte *) dos_hdr.e_magic) != DOSMAGIC)
1285 {
1286 bfd_set_error (bfd_error_wrong_format);
1287 return NULL;
1288 }
1289
1290 offset = bfd_h_get_32 (abfd, (bfd_byte *) dos_hdr.e_lfanew);
1291 if (bfd_seek (abfd, (file_ptr) offset, SEEK_SET) != 0
1292 || bfd_read (&image_hdr, 1, 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 (bfd_h_get_32 (abfd, (bfd_byte *) image_hdr.nt_signature)
1301 != 0x4550)
1302 {
1303 bfd_set_error (bfd_error_wrong_format);
1304 return NULL;
1305 }
1306
1307 /* Here is the hack. coff_object_p wants to read filhsz bytes to
1308 pick up the COFF header for PE, see "struct external_PEI_filehdr"
1309 in include/coff/pe.h. We adjust so that that will work. */
1310 if (bfd_seek (abfd,
1311 (file_ptr) (offset - sizeof (dos_hdr)),
1312 SEEK_SET)
1313 != 0)
1314 {
1315 if (bfd_get_error () != bfd_error_system_call)
1316 bfd_set_error (bfd_error_wrong_format);
1317 return NULL;
1318 }
1319
1320 return coff_object_p (abfd);
1321}
1322
1323#define coff_object_p pe_bfd_object_p
1324#endif /* COFF_IMAGE_WITH_PE */
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