source: trunk/binutils/bfd/peicode.h@ 3551

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1/* Support for the generic parts of PE/PEI, for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
4 Written by Cygnus Solutions.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22/* Most of this hacked by Steve Chamberlain,
23 sac@cygnus.com
24
25 PE/PEI rearrangement (and code added): Donn Terry
26 Softway Systems, Inc. */
27
28/* Hey look, some documentation [and in a place you expect to find it]!
29
30 The main reference for the pei format is "Microsoft Portable Executable
31 and Common Object File Format Specification 4.1". Get it if you need to
32 do some serious hacking on this code.
33
34 Another reference:
35 "Peering Inside the PE: A Tour of the Win32 Portable Executable
36 File Format", MSJ 1994, Volume 9.
37
38 The *sole* difference between the pe format and the pei format is that the
39 latter has an MSDOS 2.0 .exe header on the front that prints the message
40 "This app must be run under Windows." (or some such).
41 (FIXME: Whether that statement is *really* true or not is unknown.
42 Are there more subtle differences between pe and pei formats?
43 For now assume there aren't. If you find one, then for God sakes
44 document it here!)
45
46 The Microsoft docs use the word "image" instead of "executable" because
47 the former can also refer to a DLL (shared library). Confusion can arise
48 because the `i' in `pei' also refers to "image". The `pe' format can
49 also create images (i.e. executables), it's just that to run on a win32
50 system you need to use the pei format.
51
52 FIXME: Please add more docs here so the next poor fool that has to hack
53 on this code has a chance of getting something accomplished without
54 wasting too much time. */
55
56#include "libpei.h"
57
58static bfd_boolean (*pe_saved_coff_bfd_print_private_bfd_data)
59 PARAMS ((bfd *, PTR)) =
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
67static bfd_boolean pe_print_private_bfd_data PARAMS ((bfd *, PTR));
68#define coff_bfd_print_private_bfd_data pe_print_private_bfd_data
69
70static bfd_boolean (*pe_saved_coff_bfd_copy_private_bfd_data)
71 PARAMS ((bfd *, bfd *)) =
72#ifndef coff_bfd_copy_private_bfd_data
73 NULL;
74#else
75 coff_bfd_copy_private_bfd_data;
76#undef coff_bfd_copy_private_bfd_data
77#endif
78
79static bfd_boolean pe_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *));
80#define coff_bfd_copy_private_bfd_data pe_bfd_copy_private_bfd_data
81
82#define coff_mkobject pe_mkobject
83#define coff_mkobject_hook pe_mkobject_hook
84
85#ifndef NO_COFF_RELOCS
86static void coff_swap_reloc_in PARAMS ((bfd *, PTR, PTR));
87static unsigned int coff_swap_reloc_out PARAMS ((bfd *, PTR, PTR));
88#endif
89static void coff_swap_filehdr_in PARAMS ((bfd *, PTR, PTR));
90static void coff_swap_scnhdr_in PARAMS ((bfd *, PTR, PTR));
91static bfd_boolean pe_mkobject PARAMS ((bfd *));
92static PTR pe_mkobject_hook PARAMS ((bfd *, PTR, PTR));
93
94#ifdef COFF_IMAGE_WITH_PE
95/* This structure contains static variables used by the ILF code. */
96typedef asection * asection_ptr;
97
98typedef struct
99{
100 bfd * abfd;
101 bfd_byte * data;
102 struct bfd_in_memory * bim;
103 unsigned short magic;
104
105 arelent * reltab;
106 unsigned int relcount;
107
108 coff_symbol_type * sym_cache;
109 coff_symbol_type * sym_ptr;
110 unsigned int sym_index;
111
112 unsigned int * sym_table;
113 unsigned int * table_ptr;
114
115 combined_entry_type * native_syms;
116 combined_entry_type * native_ptr;
117
118 coff_symbol_type ** sym_ptr_table;
119 coff_symbol_type ** sym_ptr_ptr;
120
121 unsigned int sec_index;
122
123 char * string_table;
124 char * string_ptr;
125 char * end_string_ptr;
126
127 SYMENT * esym_table;
128 SYMENT * esym_ptr;
129
130 struct internal_reloc * int_reltab;
131}
132pe_ILF_vars;
133
134static asection_ptr pe_ILF_make_a_section PARAMS ((pe_ILF_vars *, const char *, unsigned int, flagword));
135static void pe_ILF_make_a_reloc PARAMS ((pe_ILF_vars *, bfd_vma, bfd_reloc_code_real_type, asection_ptr));
136static void pe_ILF_make_a_symbol PARAMS ((pe_ILF_vars *, const char *, const char *, asection_ptr, flagword));
137static void pe_ILF_save_relocs PARAMS ((pe_ILF_vars *, asection_ptr));
138static void pe_ILF_make_a_symbol_reloc PARAMS ((pe_ILF_vars *, bfd_vma, bfd_reloc_code_real_type, struct symbol_cache_entry **, unsigned int));
139static bfd_boolean pe_ILF_build_a_bfd PARAMS ((bfd *, unsigned int, bfd_byte *, bfd_byte *, unsigned int, unsigned int));
140static const bfd_target * pe_ILF_object_p PARAMS ((bfd *));
141static const bfd_target * pe_bfd_object_p PARAMS ((bfd *));
142#endif /* COFF_IMAGE_WITH_PE */
143
144/**********************************************************************/
145
146#ifndef NO_COFF_RELOCS
147static void
148coff_swap_reloc_in (abfd, src, dst)
149 bfd *abfd;
150 PTR src;
151 PTR dst;
152{
153 RELOC *reloc_src = (RELOC *) src;
154 struct internal_reloc *reloc_dst = (struct internal_reloc *) dst;
155
156 reloc_dst->r_vaddr = H_GET_32 (abfd, reloc_src->r_vaddr);
157 reloc_dst->r_symndx = H_GET_S32 (abfd, reloc_src->r_symndx);
158
159 reloc_dst->r_type = H_GET_16 (abfd, reloc_src->r_type);
160
161#ifdef SWAP_IN_RELOC_OFFSET
162 reloc_dst->r_offset = SWAP_IN_RELOC_OFFSET (abfd, reloc_src->r_offset);
163#endif
164}
165
166static unsigned int
167coff_swap_reloc_out (abfd, src, dst)
168 bfd *abfd;
169 PTR src;
170 PTR dst;
171{
172 struct internal_reloc *reloc_src = (struct internal_reloc *)src;
173 struct external_reloc *reloc_dst = (struct external_reloc *)dst;
174 H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr);
175 H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx);
176
177 H_PUT_16 (abfd, reloc_src->r_type, reloc_dst->r_type);
178
179#ifdef SWAP_OUT_RELOC_OFFSET
180 SWAP_OUT_RELOC_OFFSET (abfd, reloc_src->r_offset, reloc_dst->r_offset);
181#endif
182#ifdef SWAP_OUT_RELOC_EXTRA
183 SWAP_OUT_RELOC_EXTRA(abfd, reloc_src, reloc_dst);
184#endif
185 return RELSZ;
186}
187#endif /* not NO_COFF_RELOCS */
188
189static void
190coff_swap_filehdr_in (abfd, src, dst)
191 bfd *abfd;
192 PTR src;
193 PTR dst;
194{
195 FILHDR *filehdr_src = (FILHDR *) src;
196 struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst;
197 filehdr_dst->f_magic = H_GET_16 (abfd, filehdr_src->f_magic);
198 filehdr_dst->f_nscns = H_GET_16 (abfd, filehdr_src-> f_nscns);
199 filehdr_dst->f_timdat = H_GET_32 (abfd, filehdr_src-> f_timdat);
200
201 filehdr_dst->f_nsyms = H_GET_32 (abfd, filehdr_src-> f_nsyms);
202 filehdr_dst->f_flags = H_GET_16 (abfd, filehdr_src-> f_flags);
203 filehdr_dst->f_symptr = H_GET_32 (abfd, filehdr_src->f_symptr);
204
205 /* Other people's tools sometimes generate headers with an nsyms but
206 a zero symptr. */
207 if (filehdr_dst->f_nsyms != 0 && filehdr_dst->f_symptr == 0)
208 {
209 filehdr_dst->f_nsyms = 0;
210 filehdr_dst->f_flags |= F_LSYMS;
211 }
212
213 filehdr_dst->f_opthdr = H_GET_16 (abfd, filehdr_src-> f_opthdr);
214}
215
216#ifdef COFF_IMAGE_WITH_PE
217# define coff_swap_filehdr_out _bfd_XXi_only_swap_filehdr_out
218#else
219# define coff_swap_filehdr_out _bfd_pe_only_swap_filehdr_out
220#endif
221
222static void
223coff_swap_scnhdr_in (abfd, ext, in)
224 bfd *abfd;
225 PTR ext;
226 PTR in;
227{
228 SCNHDR *scnhdr_ext = (SCNHDR *) ext;
229 struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in;
230
231 memcpy(scnhdr_int->s_name, scnhdr_ext->s_name, sizeof (scnhdr_int->s_name));
232 scnhdr_int->s_vaddr = GET_SCNHDR_VADDR (abfd, scnhdr_ext->s_vaddr);
233 scnhdr_int->s_paddr = GET_SCNHDR_PADDR (abfd, scnhdr_ext->s_paddr);
234 scnhdr_int->s_size = GET_SCNHDR_SIZE (abfd, scnhdr_ext->s_size);
235 scnhdr_int->s_scnptr = GET_SCNHDR_SCNPTR (abfd, scnhdr_ext->s_scnptr);
236 scnhdr_int->s_relptr = GET_SCNHDR_RELPTR (abfd, scnhdr_ext->s_relptr);
237 scnhdr_int->s_lnnoptr = GET_SCNHDR_LNNOPTR (abfd, scnhdr_ext->s_lnnoptr);
238 scnhdr_int->s_flags = H_GET_32 (abfd, scnhdr_ext->s_flags);
239
240 /* MS handles overflow of line numbers by carrying into the reloc
241 field (it appears). Since it's supposed to be zero for PE
242 *IMAGE* format, that's safe. This is still a bit iffy. */
243#ifdef COFF_IMAGE_WITH_PE
244 scnhdr_int->s_nlnno = (H_GET_16 (abfd, scnhdr_ext->s_nlnno)
245 + (H_GET_16 (abfd, scnhdr_ext->s_nreloc) << 16));
246 scnhdr_int->s_nreloc = 0;
247#else
248 scnhdr_int->s_nreloc = H_GET_16 (abfd, scnhdr_ext->s_nreloc);
249 scnhdr_int->s_nlnno = H_GET_16 (abfd, scnhdr_ext->s_nlnno);
250#endif
251
252 if (scnhdr_int->s_vaddr != 0)
253 {
254 scnhdr_int->s_vaddr += pe_data (abfd)->pe_opthdr.ImageBase;
255 scnhdr_int->s_vaddr &= 0xffffffff;
256 }
257
258#ifndef COFF_NO_HACK_SCNHDR_SIZE
259 /* If this section holds uninitialized data and is from an object file
260 or from an executable image that has not initialized the field,
261 or if the physical size is padded, use the virtual size (stored in
262 s_paddr) instead. */
263 if (scnhdr_int->s_paddr > 0
264 && (((scnhdr_int->s_flags & IMAGE_SCN_CNT_UNINITIALIZED_DATA) != 0
265 && (! bfd_pe_executable_p (abfd) || scnhdr_int->s_size == 0))
266 || scnhdr_int->s_size > scnhdr_int->s_paddr))
267 {
268 scnhdr_int->s_size = scnhdr_int->s_paddr;
269
270 /* This code used to set scnhdr_int->s_paddr to 0. However,
271 coff_set_alignment_hook stores s_paddr in virt_size, which
272 only works if it correctly holds the virtual size of the
273 section. */
274 }
275#endif
276}
277
278static bfd_boolean
279pe_mkobject (abfd)
280 bfd * abfd;
281{
282 pe_data_type *pe;
283 bfd_size_type amt = sizeof (pe_data_type);
284
285 abfd->tdata.pe_obj_data = (struct pe_tdata *) bfd_zalloc (abfd, amt);
286
287 if (abfd->tdata.pe_obj_data == 0)
288 return FALSE;
289
290 pe = pe_data (abfd);
291
292 pe->coff.pe = 1;
293
294 /* in_reloc_p is architecture dependent. */
295 pe->in_reloc_p = in_reloc_p;
296
297#ifdef PEI_FORCE_MINIMUM_ALIGNMENT
298 pe->force_minimum_alignment = 1;
299#endif
300#ifdef PEI_TARGET_SUBSYSTEM
301 pe->target_subsystem = PEI_TARGET_SUBSYSTEM;
302#endif
303
304 return TRUE;
305}
306
307/* Create the COFF backend specific information. */
308static PTR
309pe_mkobject_hook (abfd, filehdr, aouthdr)
310 bfd * abfd;
311 PTR filehdr;
312 PTR aouthdr ATTRIBUTE_UNUSED;
313{
314 struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
315 pe_data_type *pe;
316
317 if (! pe_mkobject (abfd))
318 return NULL;
319
320 pe = pe_data (abfd);
321 pe->coff.sym_filepos = internal_f->f_symptr;
322 /* These members communicate important constants about the symbol
323 table to GDB's symbol-reading code. These `constants'
324 unfortunately vary among coff implementations... */
325 pe->coff.local_n_btmask = N_BTMASK;
326 pe->coff.local_n_btshft = N_BTSHFT;
327 pe->coff.local_n_tmask = N_TMASK;
328 pe->coff.local_n_tshift = N_TSHIFT;
329 pe->coff.local_symesz = SYMESZ;
330 pe->coff.local_auxesz = AUXESZ;
331 pe->coff.local_linesz = LINESZ;
332
333 pe->coff.timestamp = internal_f->f_timdat;
334
335 obj_raw_syment_count (abfd) =
336 obj_conv_table_size (abfd) =
337 internal_f->f_nsyms;
338
339 pe->real_flags = internal_f->f_flags;
340
341 if ((internal_f->f_flags & F_DLL) != 0)
342 pe->dll = 1;
343
344 if ((internal_f->f_flags & IMAGE_FILE_DEBUG_STRIPPED) == 0)
345 abfd->flags |= HAS_DEBUG;
346
347#ifdef COFF_IMAGE_WITH_PE
348 if (aouthdr)
349 pe->pe_opthdr = ((struct internal_aouthdr *)aouthdr)->pe;
350#endif
351
352#ifdef ARM
353 if (! _bfd_coff_arm_set_private_flags (abfd, internal_f->f_flags))
354 coff_data (abfd) ->flags = 0;
355#endif
356
357 return (PTR) pe;
358}
359
360static bfd_boolean
361pe_print_private_bfd_data (abfd, vfile)
362 bfd *abfd;
363 PTR vfile;
364{
365 FILE *file = (FILE *) vfile;
366
367 if (!_bfd_XX_print_private_bfd_data_common (abfd, vfile))
368 return FALSE;
369
370 if (pe_saved_coff_bfd_print_private_bfd_data != NULL)
371 {
372 fputc ('\n', file);
373
374 return pe_saved_coff_bfd_print_private_bfd_data (abfd, vfile);
375 }
376
377 return TRUE;
378}
379
380/* Copy any private info we understand from the input bfd
381 to the output bfd. */
382
383static bfd_boolean
384pe_bfd_copy_private_bfd_data (ibfd, obfd)
385 bfd *ibfd, *obfd;
386{
387 if (!_bfd_XX_bfd_copy_private_bfd_data_common (ibfd, obfd))
388 return FALSE;
389
390 if (pe_saved_coff_bfd_copy_private_bfd_data)
391 return pe_saved_coff_bfd_copy_private_bfd_data (ibfd, obfd);
392
393 return TRUE;
394}
395
396#define coff_bfd_copy_private_section_data \
397 _bfd_XX_bfd_copy_private_section_data
398
399#define coff_get_symbol_info _bfd_XX_get_symbol_info
400
401#ifdef COFF_IMAGE_WITH_PE
402
403
404/* Code to handle Microsoft's Image Library Format.
405 Also known as LINK6 format.
406 Documentation about this format can be found at:
407
408 http://msdn.microsoft.com/library/specs/pecoff_section8.htm */
409
410/* The following constants specify the sizes of the various data
411 structures that we have to create in order to build a bfd describing
412 an ILF object file. The final "+ 1" in the definitions of SIZEOF_IDATA6
413 and SIZEOF_IDATA7 below is to allow for the possibility that we might
414 need a padding byte in order to ensure 16 bit alignment for the section's
415 contents.
416
417 The value for SIZEOF_ILF_STRINGS is computed as follows:
418
419 There will be NUM_ILF_SECTIONS section symbols. Allow 9 characters
420 per symbol for their names (longest section name is .idata$x).
421
422 There will be two symbols for the imported value, one the symbol name
423 and one with _imp__ prefixed. Allowing for the terminating nul's this
424 is strlen (symbol_name) * 2 + 8 + 21 + strlen (source_dll).
425
426 The strings in the string table must start STRING__SIZE_SIZE bytes into
427 the table in order to for the string lookup code in coffgen/coffcode to
428 work. */
429#define NUM_ILF_RELOCS 8
430#define NUM_ILF_SECTIONS 6
431#define NUM_ILF_SYMS (2 + NUM_ILF_SECTIONS)
432
433#define SIZEOF_ILF_SYMS (NUM_ILF_SYMS * sizeof (* vars.sym_cache))
434#define SIZEOF_ILF_SYM_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_table))
435#define SIZEOF_ILF_NATIVE_SYMS (NUM_ILF_SYMS * sizeof (* vars.native_syms))
436#define SIZEOF_ILF_SYM_PTR_TABLE (NUM_ILF_SYMS * sizeof (* vars.sym_ptr_table))
437#define SIZEOF_ILF_EXT_SYMS (NUM_ILF_SYMS * sizeof (* vars.esym_table))
438#define SIZEOF_ILF_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.reltab))
439#define SIZEOF_ILF_INT_RELOCS (NUM_ILF_RELOCS * sizeof (* vars.int_reltab))
440#define SIZEOF_ILF_STRINGS (strlen (symbol_name) * 2 + 8 \
441 + 21 + strlen (source_dll) \
442 + NUM_ILF_SECTIONS * 9 \
443 + STRING_SIZE_SIZE)
444#define SIZEOF_IDATA2 (5 * 4)
445#define SIZEOF_IDATA4 (1 * 4)
446#define SIZEOF_IDATA5 (1 * 4)
447#define SIZEOF_IDATA6 (2 + strlen (symbol_name) + 1 + 1)
448#define SIZEOF_IDATA7 (strlen (source_dll) + 1 + 1)
449#define SIZEOF_ILF_SECTIONS (NUM_ILF_SECTIONS * sizeof (struct coff_section_tdata))
450
451#define ILF_DATA_SIZE \
452 sizeof (* vars.bim) \
453 + SIZEOF_ILF_SYMS \
454 + SIZEOF_ILF_SYM_TABLE \
455 + SIZEOF_ILF_NATIVE_SYMS \
456 + SIZEOF_ILF_SYM_PTR_TABLE \
457 + SIZEOF_ILF_EXT_SYMS \
458 + SIZEOF_ILF_RELOCS \
459 + SIZEOF_ILF_INT_RELOCS \
460 + SIZEOF_ILF_STRINGS \
461 + SIZEOF_IDATA2 \
462 + SIZEOF_IDATA4 \
463 + SIZEOF_IDATA5 \
464 + SIZEOF_IDATA6 \
465 + SIZEOF_IDATA7 \
466 + SIZEOF_ILF_SECTIONS \
467 + MAX_TEXT_SECTION_SIZE
468
469/* Create an empty relocation against the given symbol. */
470static void
471pe_ILF_make_a_symbol_reloc (pe_ILF_vars * vars,
472 bfd_vma address,
473 bfd_reloc_code_real_type reloc,
474 struct symbol_cache_entry ** sym,
475 unsigned int sym_index)
476{
477 arelent * entry;
478 struct internal_reloc * internal;
479
480 entry = vars->reltab + vars->relcount;
481 internal = vars->int_reltab + vars->relcount;
482
483 entry->address = address;
484 entry->addend = 0;
485 entry->howto = bfd_reloc_type_lookup (vars->abfd, reloc);
486 entry->sym_ptr_ptr = sym;
487
488 internal->r_vaddr = address;
489 internal->r_symndx = sym_index;
490 internal->r_type = entry->howto->type;
491#if 0 /* These fields do not need to be initialised. */
492 internal->r_size = 0;
493 internal->r_extern = 0;
494 internal->r_offset = 0;
495#endif
496
497 vars->relcount ++;
498
499 BFD_ASSERT (vars->relcount <= NUM_ILF_RELOCS);
500}
501
502/* Create an empty relocation against the given section. */
503static void
504pe_ILF_make_a_reloc (pe_ILF_vars * vars,
505 bfd_vma address,
506 bfd_reloc_code_real_type reloc,
507 asection_ptr sec)
508{
509 pe_ILF_make_a_symbol_reloc (vars, address, reloc, sec->symbol_ptr_ptr,
510 coff_section_data (vars->abfd, sec)->i);
511}
512
513/* Move the queued relocs into the given section. */
514static void
515pe_ILF_save_relocs (pe_ILF_vars * vars,
516 asection_ptr sec)
517{
518 /* Make sure that there is somewhere to store the internal relocs. */
519 if (coff_section_data (vars->abfd, sec) == NULL)
520 /* We should probably return an error indication here. */
521 abort ();
522
523 coff_section_data (vars->abfd, sec)->relocs = vars->int_reltab;
524 coff_section_data (vars->abfd, sec)->keep_relocs = TRUE;
525
526 sec->relocation = vars->reltab;
527 sec->reloc_count = vars->relcount;
528 sec->flags |= SEC_RELOC;
529
530 vars->reltab += vars->relcount;
531 vars->int_reltab += vars->relcount;
532 vars->relcount = 0;
533
534 BFD_ASSERT ((bfd_byte *) vars->int_reltab < (bfd_byte *) vars->string_table);
535}
536
537/* Create a global symbol and add it to the relevant tables. */
538static void
539pe_ILF_make_a_symbol (pe_ILF_vars * vars,
540 const char * prefix,
541 const char * symbol_name,
542 asection_ptr section,
543 flagword extra_flags)
544{
545 coff_symbol_type * sym;
546 combined_entry_type * ent;
547 SYMENT * esym;
548 unsigned short sclass;
549
550 if (extra_flags & BSF_LOCAL)
551 sclass = C_STAT;
552 else
553 sclass = C_EXT;
554
555#ifdef THUMBPEMAGIC
556 if (vars->magic == THUMBPEMAGIC)
557 {
558 if (extra_flags & BSF_FUNCTION)
559 sclass = C_THUMBEXTFUNC;
560 else if (extra_flags & BSF_LOCAL)
561 sclass = C_THUMBSTAT;
562 else
563 sclass = C_THUMBEXT;
564 }
565#endif
566
567 BFD_ASSERT (vars->sym_index < NUM_ILF_SYMS);
568
569 sym = vars->sym_ptr;
570 ent = vars->native_ptr;
571 esym = vars->esym_ptr;
572
573 /* Copy the symbol's name into the string table. */
574 sprintf (vars->string_ptr, "%s%s", prefix, symbol_name);
575
576 if (section == NULL)
577 section = (asection_ptr) & bfd_und_section;
578
579 /* Initialise the external symbol. */
580 H_PUT_32 (vars->abfd, vars->string_ptr - vars->string_table,
581 esym->e.e.e_offset);
582 H_PUT_16 (vars->abfd, section->target_index, esym->e_scnum);
583 esym->e_sclass[0] = sclass;
584
585 /* The following initialisations are unnecessary - the memory is
586 zero initialised. They are just kept here as reminders. */
587#if 0
588 esym->e.e.e_zeroes = 0;
589 esym->e_value = 0;
590 esym->e_type = T_NULL;
591 esym->e_numaux = 0;
592#endif
593
594 /* Initialise the internal symbol structure. */
595 ent->u.syment.n_sclass = sclass;
596 ent->u.syment.n_scnum = section->target_index;
597 ent->u.syment._n._n_n._n_offset = (long) sym;
598
599#if 0 /* See comment above. */
600 ent->u.syment.n_value = 0;
601 ent->u.syment.n_flags = 0;
602 ent->u.syment.n_type = T_NULL;
603 ent->u.syment.n_numaux = 0;
604 ent->fix_value = 0;
605#endif
606
607 sym->symbol.the_bfd = vars->abfd;
608 sym->symbol.name = vars->string_ptr;
609 sym->symbol.flags = BSF_EXPORT | BSF_GLOBAL | extra_flags;
610 sym->symbol.section = section;
611 sym->native = ent;
612
613#if 0 /* See comment above. */
614 sym->symbol.value = 0;
615 sym->symbol.udata.i = 0;
616 sym->done_lineno = FALSE;
617 sym->lineno = NULL;
618#endif
619
620 * vars->table_ptr = vars->sym_index;
621 * vars->sym_ptr_ptr = sym;
622
623 /* Adjust pointers for the next symbol. */
624 vars->sym_index ++;
625 vars->sym_ptr ++;
626 vars->sym_ptr_ptr ++;
627 vars->table_ptr ++;
628 vars->native_ptr ++;
629 vars->esym_ptr ++;
630 vars->string_ptr += strlen (symbol_name) + strlen (prefix) + 1;
631
632 BFD_ASSERT (vars->string_ptr < vars->end_string_ptr);
633}
634
635/* Create a section. */
636static asection_ptr
637pe_ILF_make_a_section (pe_ILF_vars * vars,
638 const char * name,
639 unsigned int size,
640 flagword extra_flags)
641{
642 asection_ptr sec;
643 flagword flags;
644
645 sec = bfd_make_section_old_way (vars->abfd, name);
646 if (sec == NULL)
647 return NULL;
648
649 flags = SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_IN_MEMORY;
650
651 bfd_set_section_flags (vars->abfd, sec, flags | extra_flags);
652
653 bfd_set_section_alignment (vars->abfd, sec, 2);
654
655 /* Check that we will not run out of space. */
656 BFD_ASSERT (vars->data + size < vars->bim->buffer + vars->bim->size);
657
658 /* Set the section size and contents. The actual
659 contents are filled in by our parent. */
660 bfd_set_section_size (vars->abfd, sec, (bfd_size_type) size);
661 sec->contents = vars->data;
662 sec->target_index = vars->sec_index ++;
663
664 /* Advance data pointer in the vars structure. */
665 vars->data += size;
666
667 /* Skip the padding byte if it was not needed.
668 The logic here is that if the string length is odd,
669 then the entire string length, including the null byte,
670 is even and so the extra, padding byte, is not needed. */
671 if (size & 1)
672 vars->data --;
673
674 /* Create a coff_section_tdata structure for our use. */
675 sec->used_by_bfd = (struct coff_section_tdata *) vars->data;
676 vars->data += sizeof (struct coff_section_tdata);
677
678 BFD_ASSERT (vars->data <= vars->bim->buffer + vars->bim->size);
679
680 /* Create a symbol to refer to this section. */
681 pe_ILF_make_a_symbol (vars, "", name, sec, BSF_LOCAL);
682
683 /* Cache the index to the symbol in the coff_section_data structure. */
684 coff_section_data (vars->abfd, sec)->i = vars->sym_index - 1;
685
686 return sec;
687}
688
689/* This structure contains the code that goes into the .text section
690 in order to perform a jump into the DLL lookup table. The entries
691 in the table are index by the magic number used to represent the
692 machine type in the PE file. The contents of the data[] arrays in
693 these entries are stolen from the jtab[] arrays in ld/pe-dll.c.
694 The SIZE field says how many bytes in the DATA array are actually
695 used. The OFFSET field says where in the data array the address
696 of the .idata$5 section should be placed. */
697#define MAX_TEXT_SECTION_SIZE 32
698
699typedef struct
700{
701 unsigned short magic;
702 unsigned char data[MAX_TEXT_SECTION_SIZE];
703 unsigned int size;
704 unsigned int offset;
705}
706jump_table;
707
708static jump_table jtab[] =
709{
710#ifdef I386MAGIC
711 { I386MAGIC,
712 { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 },
713 8, 2
714 },
715#endif
716
717#ifdef MC68MAGIC
718 { MC68MAGIC, { /* XXX fill me in */ }, 0, 0 },
719#endif
720#ifdef MIPS_ARCH_MAGIC_WINCE
721 { MIPS_ARCH_MAGIC_WINCE,
722 { 0x00, 0x00, 0x08, 0x3c, 0x00, 0x00, 0x08, 0x8d,
723 0x08, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00 },
724 16, 0
725 },
726#endif
727
728#ifdef SH_ARCH_MAGIC_WINCE
729 { SH_ARCH_MAGIC_WINCE,
730 { 0x01, 0xd0, 0x02, 0x60, 0x2b, 0x40,
731 0x09, 0x00, 0x00, 0x00, 0x00, 0x00 },
732 12, 8
733 },
734#endif
735
736#ifdef ARMPEMAGIC
737 { ARMPEMAGIC,
738 { 0x00, 0xc0, 0x9f, 0xe5, 0x00, 0xf0,
739 0x9c, 0xe5, 0x00, 0x00, 0x00, 0x00},
740 12, 8
741 },
742#endif
743
744#ifdef THUMBPEMAGIC
745 { THUMBPEMAGIC,
746 { 0x40, 0xb4, 0x02, 0x4e, 0x36, 0x68, 0xb4, 0x46,
747 0x40, 0xbc, 0x60, 0x47, 0x00, 0x00, 0x00, 0x00 },
748 16, 12
749 },
750#endif
751 { 0, { 0 }, 0, 0 }
752};
753
754#ifndef NUM_ENTRIES
755#define NUM_ENTRIES(a) (sizeof (a) / sizeof (a)[0])
756#endif
757
758/* Build a full BFD from the information supplied in a ILF object. */
759static bfd_boolean
760pe_ILF_build_a_bfd (bfd * abfd,
761 unsigned int magic,
762 bfd_byte * symbol_name,
763 bfd_byte * source_dll,
764 unsigned int ordinal,
765 unsigned int types)
766{
767 bfd_byte * ptr;
768 pe_ILF_vars vars;
769 struct internal_filehdr internal_f;
770 unsigned int import_type;
771 unsigned int import_name_type;
772 asection_ptr id4, id5, id6 = NULL, text = NULL;
773 coff_symbol_type ** imp_sym;
774 unsigned int imp_index;
775
776 /* Decode and verify the types field of the ILF structure. */
777 import_type = types & 0x3;
778 import_name_type = (types & 0x1c) >> 2;
779
780 switch (import_type)
781 {
782 case IMPORT_CODE:
783 case IMPORT_DATA:
784 break;
785
786 case IMPORT_CONST:
787 /* XXX code yet to be written. */
788 _bfd_error_handler (_("%s: Unhandled import type; %x"),
789 bfd_archive_filename (abfd), import_type);
790 return FALSE;
791
792 default:
793 _bfd_error_handler (_("%s: Unrecognised import type; %x"),
794 bfd_archive_filename (abfd), import_type);
795 return FALSE;
796 }
797
798 switch (import_name_type)
799 {
800 case IMPORT_ORDINAL:
801 case IMPORT_NAME:
802 case IMPORT_NAME_NOPREFIX:
803 case IMPORT_NAME_UNDECORATE:
804 break;
805
806 default:
807 _bfd_error_handler (_("%s: Unrecognised import name type; %x"),
808 bfd_archive_filename (abfd), import_name_type);
809 return FALSE;
810 }
811
812 /* Initialise local variables.
813
814 Note these are kept in a structure rather than being
815 declared as statics since bfd frowns on global variables.
816
817 We are going to construct the contents of the BFD in memory,
818 so allocate all the space that we will need right now. */
819 ptr = bfd_zalloc (abfd, (bfd_size_type) ILF_DATA_SIZE);
820 if (ptr == NULL)
821 return FALSE;
822
823 /* Create a bfd_in_memory structure. */
824 vars.bim = (struct bfd_in_memory *) ptr;
825 vars.bim->buffer = ptr;
826 vars.bim->size = ILF_DATA_SIZE;
827 ptr += sizeof (* vars.bim);
828
829 /* Initialise the pointers to regions of the memory and the
830 other contents of the pe_ILF_vars structure as well. */
831 vars.sym_cache = (coff_symbol_type *) ptr;
832 vars.sym_ptr = (coff_symbol_type *) ptr;
833 vars.sym_index = 0;
834 ptr += SIZEOF_ILF_SYMS;
835
836 vars.sym_table = (unsigned int *) ptr;
837 vars.table_ptr = (unsigned int *) ptr;
838 ptr += SIZEOF_ILF_SYM_TABLE;
839
840 vars.native_syms = (combined_entry_type *) ptr;
841 vars.native_ptr = (combined_entry_type *) ptr;
842 ptr += SIZEOF_ILF_NATIVE_SYMS;
843
844 vars.sym_ptr_table = (coff_symbol_type **) ptr;
845 vars.sym_ptr_ptr = (coff_symbol_type **) ptr;
846 ptr += SIZEOF_ILF_SYM_PTR_TABLE;
847
848 vars.esym_table = (SYMENT *) ptr;
849 vars.esym_ptr = (SYMENT *) ptr;
850 ptr += SIZEOF_ILF_EXT_SYMS;
851
852 vars.reltab = (arelent *) ptr;
853 vars.relcount = 0;
854 ptr += SIZEOF_ILF_RELOCS;
855
856 vars.int_reltab = (struct internal_reloc *) ptr;
857 ptr += SIZEOF_ILF_INT_RELOCS;
858
859 vars.string_table = ptr;
860 vars.string_ptr = ptr + STRING_SIZE_SIZE;
861 ptr += SIZEOF_ILF_STRINGS;
862 vars.end_string_ptr = ptr;
863
864 /* The remaining space in bim->buffer is used
865 by the pe_ILF_make_a_section() function. */
866 vars.data = ptr;
867 vars.abfd = abfd;
868 vars.sec_index = 0;
869 vars.magic = magic;
870
871 /* Create the initial .idata$<n> sections:
872 [.idata$2: Import Directory Table -- not needed]
873 .idata$4: Import Lookup Table
874 .idata$5: Import Address Table
875
876 Note we do not create a .idata$3 section as this is
877 created for us by the linker script. */
878 id4 = pe_ILF_make_a_section (& vars, ".idata$4", SIZEOF_IDATA4, 0);
879 id5 = pe_ILF_make_a_section (& vars, ".idata$5", SIZEOF_IDATA5, 0);
880 if (id4 == NULL || id5 == NULL)
881 return FALSE;
882
883 /* Fill in the contents of these sections. */
884 if (import_name_type == IMPORT_ORDINAL)
885 {
886 if (ordinal == 0)
887 /* XXX - treat as IMPORT_NAME ??? */
888 abort ();
889
890 * (unsigned int *) id4->contents = ordinal | 0x80000000;
891 * (unsigned int *) id5->contents = ordinal | 0x80000000;
892 }
893 else
894 {
895 char * symbol;
896
897 /* Create .idata$6 - the Hint Name Table. */
898 id6 = pe_ILF_make_a_section (& vars, ".idata$6", SIZEOF_IDATA6, 0);
899 if (id6 == NULL)
900 return FALSE;
901
902 /* If necessary, trim the import symbol name. */
903 symbol = symbol_name;
904
905 if (import_name_type != IMPORT_NAME)
906 /* Skip any prefix in symbol_name. */
907 while (*symbol == '@' || * symbol == '?' || * symbol == '_')
908 ++ symbol;
909
910 if (import_name_type == IMPORT_NAME_UNDECORATE)
911 {
912 /* Truncate at the first '@' */
913 while (* symbol != 0 && * symbol != '@')
914 symbol ++;
915
916 * symbol = 0;
917 }
918
919 id6->contents[0] = ordinal & 0xff;
920 id6->contents[1] = ordinal >> 8;
921
922 strcpy (id6->contents + 2, symbol);
923 }
924
925 if (import_name_type != IMPORT_ORDINAL)
926 {
927 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_RVA, id6);
928 pe_ILF_save_relocs (&vars, id4);
929
930 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_RVA, id6);
931 pe_ILF_save_relocs (&vars, id5);
932 }
933
934 /* Create extra sections depending upon the type of import we are dealing with. */
935 switch (import_type)
936 {
937 int i;
938
939 case IMPORT_CODE:
940 /* Create a .text section.
941 First we need to look up its contents in the jump table. */
942 for (i = NUM_ENTRIES (jtab); i--;)
943 {
944 if (jtab[i].size == 0)
945 continue;
946 if (jtab[i].magic == magic)
947 break;
948 }
949 /* If we did not find a matching entry something is wrong. */
950 if (i < 0)
951 abort ();
952
953 /* Create the .text section. */
954 text = pe_ILF_make_a_section (& vars, ".text", jtab[i].size, SEC_CODE);
955 if (text == NULL)
956 return FALSE;
957
958 /* Copy in the jump code. */
959 memcpy (text->contents, jtab[i].data, jtab[i].size);
960
961 /* Create an import symbol. */
962 pe_ILF_make_a_symbol (& vars, "__imp_", symbol_name, id5, 0);
963 imp_sym = vars.sym_ptr_ptr - 1;
964 imp_index = vars.sym_index - 1;
965
966 /* Create a reloc for the data in the text section. */
967#ifdef MIPS_ARCH_MAGIC_WINCE
968 if (magic == MIPS_ARCH_MAGIC_WINCE)
969 {
970 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) 0, BFD_RELOC_HI16_S,
971 (struct symbol_cache_entry **) imp_sym,
972 imp_index);
973 pe_ILF_make_a_reloc (&vars, (bfd_vma) 0, BFD_RELOC_LO16, text);
974 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) 4, BFD_RELOC_LO16,
975 (struct symbol_cache_entry **) imp_sym,
976 imp_index);
977 }
978 else
979#endif
980 pe_ILF_make_a_symbol_reloc (&vars, (bfd_vma) jtab[i].offset,
981 BFD_RELOC_32, (asymbol **) imp_sym,
982 imp_index);
983
984 pe_ILF_save_relocs (& vars, text);
985 break;
986
987 case IMPORT_DATA:
988 break;
989
990 default:
991 /* XXX code not yet written. */
992 abort ();
993 }
994
995 /* Initialise the bfd. */
996 memset (& internal_f, 0, sizeof (internal_f));
997
998 internal_f.f_magic = magic;
999 internal_f.f_symptr = 0;
1000 internal_f.f_nsyms = 0;
1001 internal_f.f_flags = F_AR32WR | F_LNNO; /* XXX is this correct ? */
1002
1003 if ( ! bfd_set_start_address (abfd, (bfd_vma) 0)
1004 || ! bfd_coff_set_arch_mach_hook (abfd, & internal_f))
1005 return FALSE;
1006
1007 if (bfd_coff_mkobject_hook (abfd, (PTR) & internal_f, NULL) == NULL)
1008 return FALSE;
1009
1010 coff_data (abfd)->pe = 1;
1011#ifdef THUMBPEMAGIC
1012 if (vars.magic == THUMBPEMAGIC)
1013 /* Stop some linker warnings about thumb code not supporting interworking. */
1014 coff_data (abfd)->flags |= F_INTERWORK | F_INTERWORK_SET;
1015#endif
1016
1017 /* Switch from file contents to memory contents. */
1018 bfd_cache_close (abfd);
1019
1020 abfd->iostream = (PTR) vars.bim;
1021 abfd->flags |= BFD_IN_MEMORY /* | HAS_LOCALS */;
1022 abfd->where = 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 = 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) = (PTR) 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
1072/* We have detected a Image Library Format archive element.
1073 Decode the element and return the appropriate target. */
1074static const bfd_target *
1075pe_ILF_object_p (bfd * abfd)
1076{
1077 bfd_byte buffer[16];
1078 bfd_byte * ptr;
1079 bfd_byte * symbol_name;
1080 bfd_byte * source_dll;
1081 unsigned int machine;
1082 bfd_size_type size;
1083 unsigned int ordinal;
1084 unsigned int types;
1085 unsigned int magic;
1086
1087 /* Upon entry the first four buyes of the ILF header have
1088 already been read. Now read the rest of the header. */
1089 if (bfd_bread (buffer, (bfd_size_type) 16, abfd) != 16)
1090 return NULL;
1091
1092 ptr = buffer;
1093
1094 /* We do not bother to check the version number.
1095 version = H_GET_16 (abfd, ptr); */
1096 ptr += 2;
1097
1098 machine = H_GET_16 (abfd, ptr);
1099 ptr += 2;
1100
1101 /* Check that the machine type is recognised. */
1102 magic = 0;
1103
1104 switch (machine)
1105 {
1106 case IMAGE_FILE_MACHINE_UNKNOWN:
1107 case IMAGE_FILE_MACHINE_ALPHA:
1108 case IMAGE_FILE_MACHINE_ALPHA64:
1109 case IMAGE_FILE_MACHINE_IA64:
1110 break;
1111
1112 case IMAGE_FILE_MACHINE_I386:
1113#ifdef I386MAGIC
1114 magic = I386MAGIC;
1115#endif
1116 break;
1117
1118 case IMAGE_FILE_MACHINE_M68K:
1119#ifdef MC68AGIC
1120 magic = MC68MAGIC;
1121#endif
1122 break;
1123
1124 case IMAGE_FILE_MACHINE_R3000:
1125 case IMAGE_FILE_MACHINE_R4000:
1126 case IMAGE_FILE_MACHINE_R10000:
1127
1128 case IMAGE_FILE_MACHINE_MIPS16:
1129 case IMAGE_FILE_MACHINE_MIPSFPU:
1130 case IMAGE_FILE_MACHINE_MIPSFPU16:
1131#ifdef MIPS_ARCH_MAGIC_WINCE
1132 magic = MIPS_ARCH_MAGIC_WINCE;
1133#endif
1134 break;
1135
1136 case IMAGE_FILE_MACHINE_SH3:
1137 case IMAGE_FILE_MACHINE_SH4:
1138#ifdef SH_ARCH_MAGIC_WINCE
1139 magic = SH_ARCH_MAGIC_WINCE;
1140#endif
1141 break;
1142
1143 case IMAGE_FILE_MACHINE_ARM:
1144#ifdef ARMPEMAGIC
1145 magic = ARMPEMAGIC;
1146#endif
1147 break;
1148
1149 case IMAGE_FILE_MACHINE_THUMB:
1150#ifdef THUMBPEMAGIC
1151 {
1152 extern const bfd_target TARGET_LITTLE_SYM;
1153
1154 if (abfd->xvec == & TARGET_LITTLE_SYM)
1155 magic = THUMBPEMAGIC;
1156 }
1157#endif
1158 break;
1159
1160 case IMAGE_FILE_MACHINE_POWERPC:
1161 /* We no longer support PowerPC. */
1162 default:
1163 _bfd_error_handler
1164 (
1165_("%s: Unrecognised machine type (0x%x) in Import Library Format archive"),
1166 bfd_archive_filename (abfd), machine);
1167 bfd_set_error (bfd_error_malformed_archive);
1168
1169 return NULL;
1170 break;
1171 }
1172
1173 if (magic == 0)
1174 {
1175 _bfd_error_handler
1176 (
1177_("%s: Recognised but unhandled machine type (0x%x) in Import Library Format archive"),
1178 bfd_archive_filename (abfd), machine);
1179 bfd_set_error (bfd_error_wrong_format);
1180
1181 return NULL;
1182 }
1183
1184 /* We do not bother to check the date.
1185 date = H_GET_32 (abfd, ptr); */
1186 ptr += 4;
1187
1188 size = H_GET_32 (abfd, ptr);
1189 ptr += 4;
1190
1191 if (size == 0)
1192 {
1193 _bfd_error_handler
1194 (_("%s: size field is zero in Import Library Format header"),
1195 bfd_archive_filename (abfd));
1196 bfd_set_error (bfd_error_malformed_archive);
1197
1198 return NULL;
1199 }
1200
1201 ordinal = H_GET_16 (abfd, ptr);
1202 ptr += 2;
1203
1204 types = H_GET_16 (abfd, ptr);
1205 /* ptr += 2; */
1206
1207 /* Now read in the two strings that follow. */
1208 ptr = bfd_alloc (abfd, size);
1209 if (ptr == NULL)
1210 return NULL;
1211
1212 if (bfd_bread (ptr, size, abfd) != size)
1213 {
1214 bfd_release (abfd, ptr);
1215 return NULL;
1216 }
1217
1218 symbol_name = ptr;
1219 source_dll = ptr + strlen (ptr) + 1;
1220
1221 /* Verify that the strings are null terminated. */
1222 if (ptr[size - 1] != 0 || ((unsigned long) (source_dll - ptr) >= size))
1223 {
1224 _bfd_error_handler
1225 (_("%s: string not null terminated in ILF object file."),
1226 bfd_archive_filename (abfd));
1227 bfd_set_error (bfd_error_malformed_archive);
1228 bfd_release (abfd, ptr);
1229 return NULL;
1230 }
1231
1232 /* Now construct the bfd. */
1233 if (! pe_ILF_build_a_bfd (abfd, magic, symbol_name,
1234 source_dll, ordinal, types))
1235 {
1236 bfd_release (abfd, ptr);
1237 return NULL;
1238 }
1239
1240 return abfd->xvec;
1241}
1242
1243static const bfd_target *
1244pe_bfd_object_p (bfd * abfd)
1245{
1246 bfd_byte buffer[4];
1247 struct external_PEI_DOS_hdr dos_hdr;
1248 struct external_PEI_IMAGE_hdr image_hdr;
1249 file_ptr offset;
1250
1251 /* Detect if this a Microsoft Import Library Format element. */
1252 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
1253 || bfd_bread (buffer, (bfd_size_type) 4, abfd) != 4)
1254 {
1255 if (bfd_get_error () != bfd_error_system_call)
1256 bfd_set_error (bfd_error_wrong_format);
1257 return NULL;
1258 }
1259
1260 if (H_GET_32 (abfd, buffer) == 0xffff0000)
1261 return pe_ILF_object_p (abfd);
1262
1263 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
1264 || bfd_bread (&dos_hdr, (bfd_size_type) sizeof (dos_hdr), abfd)
1265 != sizeof (dos_hdr))
1266 {
1267 if (bfd_get_error () != bfd_error_system_call)
1268 bfd_set_error (bfd_error_wrong_format);
1269 return NULL;
1270 }
1271
1272 /* There are really two magic numbers involved; the magic number
1273 that says this is a NT executable (PEI) and the magic number that
1274 determines the architecture. The former is DOSMAGIC, stored in
1275 the e_magic field. The latter is stored in the f_magic field.
1276 If the NT magic number isn't valid, the architecture magic number
1277 could be mimicked by some other field (specifically, the number
1278 of relocs in section 3). Since this routine can only be called
1279 correctly for a PEI file, check the e_magic number here, and, if
1280 it doesn't match, clobber the f_magic number so that we don't get
1281 a false match. */
1282 if (H_GET_16 (abfd, dos_hdr.e_magic) != DOSMAGIC)
1283 {
1284 bfd_set_error (bfd_error_wrong_format);
1285 return NULL;
1286 }
1287
1288 offset = H_GET_32 (abfd, dos_hdr.e_lfanew);
1289 if (bfd_seek (abfd, offset, SEEK_SET) != 0
1290 || (bfd_bread (&image_hdr, (bfd_size_type) sizeof (image_hdr), abfd)
1291 != sizeof (image_hdr)))
1292 {
1293 if (bfd_get_error () != bfd_error_system_call)
1294 bfd_set_error (bfd_error_wrong_format);
1295 return NULL;
1296 }
1297
1298 if (H_GET_32 (abfd, image_hdr.nt_signature) != 0x4550)
1299 {
1300 bfd_set_error (bfd_error_wrong_format);
1301 return NULL;
1302 }
1303
1304 /* Here is the hack. coff_object_p wants to read filhsz bytes to
1305 pick up the COFF header for PE, see "struct external_PEI_filehdr"
1306 in include/coff/pe.h. We adjust so that that will work. */
1307 if (bfd_seek (abfd, (file_ptr) (offset - sizeof (dos_hdr)), SEEK_SET) != 0)
1308 {
1309 if (bfd_get_error () != bfd_error_system_call)
1310 bfd_set_error (bfd_error_wrong_format);
1311 return NULL;
1312 }
1313
1314 return coff_object_p (abfd);
1315}
1316
1317#define coff_object_p pe_bfd_object_p
1318#endif /* COFF_IMAGE_WITH_PE */
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