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source: bootcd/isolinux/syslinux-6.03/gpxe/src/util/elf2efi.c @ dd1be7c

Last change on this file since dd1be7c was e16e8f2, checked in by Edwin Eefting <edwin@datux.nl>, 3 years ago
bootstuff
Property mode set to `100644`
File size: 21.7 KB

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1	/*
2	* Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
3	*
4	* This program is free software; you can redistribute it and/or
5	* modify it under the terms of the GNU General Public License as
6	* published by the Free Software Foundation; either version 2 of the
7	* License, or any later version.
8	*
9	* This program is distributed in the hope that it will be useful, but
10	* WITHOUT ANY WARRANTY; without even the implied warranty of
11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12	* General Public License for more details.
13	*
14	* You should have received a copy of the GNU General Public License
15	* along with this program; if not, write to the Free Software
16	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17	*/
18
19	#define _GNU_SOURCE
20	#include <stdint.h>
21	#include <stddef.h>
22	#include <stdlib.h>
23	#include <stdio.h>
24	#include <string.h>
25	#include <unistd.h>
26	#include <errno.h>
27	#include <assert.h>
28	#include <getopt.h>
29	#include <bfd.h>
30	#include <gpxe/efi/efi.h>
31	#include <gpxe/efi/IndustryStandard/PeImage.h>
32	#include <libgen.h>
33
34	#define eprintf(...) fprintf ( stderr, __VA_ARGS__ )
35
36	#define EFI_FILE_ALIGN 0x20
37
38	struct pe_section {
39	struct pe_section *next;
40	EFI_IMAGE_SECTION_HEADER hdr;
41	uint8_t contents[0];
42	};
43
44	struct pe_relocs {
45	struct pe_relocs *next;
46	unsigned long start_rva;
47	unsigned int used_relocs;
48	unsigned int total_relocs;
49	uint16_t *relocs;
50	};
51
52	struct pe_header {
53	EFI_IMAGE_DOS_HEADER dos;
54	uint8_t padding[128];
55	#if defined(MDE_CPU_IA32)
56	EFI_IMAGE_NT_HEADERS32 nt;
57	#elif defined(MDE_CPU_X64)
58	EFI_IMAGE_NT_HEADERS64 nt;
59	#endif
60	};
61
62	static struct pe_header efi_pe_header = {
63	.dos = {
64	.e_magic = EFI_IMAGE_DOS_SIGNATURE,
65	.e_lfanew = offsetof ( typeof ( efi_pe_header ), nt ),
66	},
67	.nt = {
68	.Signature = EFI_IMAGE_NT_SIGNATURE,
69	.FileHeader = {
70	#if defined(MDE_CPU_IA32)
71	.Machine = EFI_IMAGE_MACHINE_IA32,
72	#elif defined(MDE_CPU_X64)
73	.Machine = EFI_IMAGE_MACHINE_X64,
74	#endif
75	.TimeDateStamp = 0x10d1a884,
76	.SizeOfOptionalHeader =
77	sizeof ( efi_pe_header.nt.OptionalHeader ),
78	.Characteristics = ( EFI_IMAGE_FILE_DLL \|
79	#if defined(MDE_CPU_IA32)
80	EFI_IMAGE_FILE_32BIT_MACHINE \|
81	#endif
82	EFI_IMAGE_FILE_EXECUTABLE_IMAGE ),
83	},
84	.OptionalHeader = {
85	#if defined(MDE_CPU_IA32)
86	.Magic = EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC,
87	#elif defined(MDE_CPU_X64)
88	.Magic = EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC,
89	#endif
90	.SectionAlignment = EFI_FILE_ALIGN,
91	.FileAlignment = EFI_FILE_ALIGN,
92	.SizeOfImage = sizeof ( efi_pe_header ),
93	.SizeOfHeaders = sizeof ( efi_pe_header ),
94	.NumberOfRvaAndSizes =
95	EFI_IMAGE_NUMBER_OF_DIRECTORY_ENTRIES,
96	},
97	},
98	};
99
100	/** Command-line options */
101	struct options {
102	unsigned int subsystem;
103	};
104
105	/**
106	* Allocate memory
107	*
108	* @v len Length of memory to allocate
109	* @ret ptr Pointer to allocated memory
110	*/
111	static void * xmalloc ( size_t len ) {
112	void *ptr;
113
114	ptr = malloc ( len );
115	if ( ! ptr ) {
116	eprintf ( "Could not allocate %zd bytes\n", len );
117	exit ( 1 );
118	}
119
120	return ptr;
121	}
122
123	/**
124	* Align section within PE file
125	*
126	* @v offset Unaligned offset
127	* @ret aligned_offset Aligned offset
128	*/
129	static unsigned long efi_file_align ( unsigned long offset ) {
130	return ( ( offset + EFI_FILE_ALIGN - 1 ) & ~( EFI_FILE_ALIGN - 1 ) );
131	}
132
133	/**
134	* Generate entry in PE relocation table
135	*
136	* @v pe_reltab PE relocation table
137	* @v rva RVA
138	* @v size Size of relocation entry
139	*/
140	static void generate_pe_reloc ( struct pe_relocs **pe_reltab,
141	unsigned long rva, size_t size ) {
142	unsigned long start_rva;
143	uint16_t reloc;
144	struct pe_relocs *pe_rel;
145	uint16_t *relocs;
146
147	/* Construct */
148	start_rva = ( rva & ~0xfff );
149	reloc = ( rva & 0xfff );
150	switch ( size ) {
151	case 8:
152	reloc \|= 0xa000;
153	break;
154	case 4:
155	reloc \|= 0x3000;
156	break;
157	case 2:
158	reloc \|= 0x2000;
159	break;
160	default:
161	eprintf ( "Unsupported relocation size %zd\n", size );
162	exit ( 1 );
163	}
164
165	/* Locate or create PE relocation table */
166	for ( pe_rel = *pe_reltab ; pe_rel ; pe_rel = pe_rel->next ) {
167	if ( pe_rel->start_rva == start_rva )
168	break;
169	}
170	if ( ! pe_rel ) {
171	pe_rel = xmalloc ( sizeof ( *pe_rel ) );
172	memset ( pe_rel, 0, sizeof ( *pe_rel ) );
173	pe_rel->next = *pe_reltab;
174	*pe_reltab = pe_rel;
175	pe_rel->start_rva = start_rva;
176	}
177
178	/* Expand relocation list if necessary */
179	if ( pe_rel->used_relocs < pe_rel->total_relocs ) {
180	relocs = pe_rel->relocs;
181	} else {
182	pe_rel->total_relocs = ( pe_rel->total_relocs ?
183	( pe_rel->total_relocs * 2 ) : 256 );
184	relocs = xmalloc ( pe_rel->total_relocs *
185	sizeof ( pe_rel->relocs[0] ) );
186	memset ( relocs, 0,
187	pe_rel->total_relocs * sizeof ( pe_rel->relocs[0] ) );
188	memcpy ( relocs, pe_rel->relocs,
189	pe_rel->used_relocs * sizeof ( pe_rel->relocs[0] ) );
190	free ( pe_rel->relocs );
191	pe_rel->relocs = relocs;
192	}
193
194	/* Store relocation */
195	pe_rel->relocs[ pe_rel->used_relocs++ ] = reloc;
196	}
197
198	/**
199	* Calculate size of binary PE relocation table
200	*
201	* @v pe_reltab PE relocation table
202	* @v buffer Buffer to contain binary table, or NULL
203	* @ret size Size of binary table
204	*/
205	static size_t output_pe_reltab ( struct pe_relocs *pe_reltab,
206	void *buffer ) {
207	struct pe_relocs *pe_rel;
208	unsigned int num_relocs;
209	size_t size;
210	size_t total_size = 0;
211
212	for ( pe_rel = pe_reltab ; pe_rel ; pe_rel = pe_rel->next ) {
213	num_relocs = ( ( pe_rel->used_relocs + 1 ) & ~1 );
214	size = ( sizeof ( uint32_t ) /* VirtualAddress */ +
215	sizeof ( uint32_t ) /* SizeOfBlock */ +
216	( num_relocs * sizeof ( uint16_t ) ) );
217	if ( buffer ) {
218	( (uint32_t ) ( buffer + total_size + 0 ) )
219	= pe_rel->start_rva;
220	( (uint32_t ) ( buffer + total_size + 4 ) ) = size;
221	memcpy ( ( buffer + total_size + 8 ), pe_rel->relocs,
222	( num_relocs * sizeof ( uint16_t ) ) );
223	}
224	total_size += size;
225	}
226
227	return total_size;
228	}
229
230	/**
231	* Open input BFD file
232	*
233	* @v filename File name
234	* @ret ibfd BFD file
235	*/
236	static bfd * open_input_bfd ( const char *filename ) {
237	bfd *bfd;
238
239	/* Open the file */
240	bfd = bfd_openr ( filename, NULL );
241	if ( ! bfd ) {
242	eprintf ( "Cannot open %s: ", filename );
243	bfd_perror ( NULL );
244	exit ( 1 );
245	}
246
247	/* The call to bfd_check_format() must be present, otherwise
248	* we get a segfault from later BFD calls.
249	*/
250	if ( bfd_check_format ( bfd, bfd_object ) < 0 ) {
251	eprintf ( "%s is not an object file\n", filename );
252	exit ( 1 );
253	}
254
255	return bfd;
256	}
257
258	/**
259	* Read symbol table
260	*
261	* @v bfd BFD file
262	*/
263	static asymbol ** read_symtab ( bfd *bfd ) {
264	long symtab_size;
265	asymbol **symtab;
266	long symcount;
267
268	/* Get symbol table size */
269	symtab_size = bfd_get_symtab_upper_bound ( bfd );
270	if ( symtab_size < 0 ) {
271	bfd_perror ( "Could not get symbol table upper bound" );
272	exit ( 1 );
273	}
274
275	/* Allocate and read symbol table */
276	symtab = xmalloc ( symtab_size );
277	symcount = bfd_canonicalize_symtab ( bfd, symtab );
278	if ( symcount < 0 ) {
279	bfd_perror ( "Cannot read symbol table" );
280	exit ( 1 );
281	}
282
283	return symtab;
284	}
285
286	/**
287	* Read relocation table
288	*
289	* @v bfd BFD file
290	* @v symtab Symbol table
291	* @v section Section
292	* @v symtab Symbol table
293	* @ret reltab Relocation table
294	*/
295	static arelent ** read_reltab ( bfd bfd, asymbol *symtab,
296	asection *section ) {
297	long reltab_size;
298	arelent **reltab;
299	long numrels;
300
301	/* Get relocation table size */
302	reltab_size = bfd_get_reloc_upper_bound ( bfd, section );
303	if ( reltab_size < 0 ) {
304	bfd_perror ( "Could not get relocation table upper bound" );
305	exit ( 1 );
306	}
307
308	/* Allocate and read relocation table */
309	reltab = xmalloc ( reltab_size );
310	numrels = bfd_canonicalize_reloc ( bfd, section, reltab, symtab );
311	if ( numrels < 0 ) {
312	bfd_perror ( "Cannot read relocation table" );
313	exit ( 1 );
314	}
315
316	return reltab;
317	}
318
319	/**
320	* Process section
321	*
322	* @v bfd BFD file
323	* @v pe_header PE file header
324	* @v section Section
325	* @ret new New PE section
326	*/
327	static struct pe_section * process_section ( bfd *bfd,
328	struct pe_header *pe_header,
329	asection *section ) {
330	struct pe_section *new;
331	size_t section_memsz;
332	size_t section_filesz;
333	unsigned long flags = bfd_get_section_flags ( bfd, section );
334	unsigned long code_start;
335	unsigned long code_end;
336	unsigned long data_start;
337	unsigned long data_mid;
338	unsigned long data_end;
339	unsigned long start;
340	unsigned long end;
341	unsigned long *applicable_start;
342	unsigned long *applicable_end;
343
344	/* Extract current RVA limits from file header */
345	code_start = pe_header->nt.OptionalHeader.BaseOfCode;
346	code_end = ( code_start + pe_header->nt.OptionalHeader.SizeOfCode );
347	#if defined(MDE_CPU_IA32)
348	data_start = pe_header->nt.OptionalHeader.BaseOfData;
349	#elif defined(MDE_CPU_X64)
350	data_start = code_end;
351	#endif
352	data_mid = ( data_start +
353	pe_header->nt.OptionalHeader.SizeOfInitializedData );
354	data_end = ( data_mid +
355	pe_header->nt.OptionalHeader.SizeOfUninitializedData );
356
357	/* Allocate PE section */
358	section_memsz = bfd_section_size ( bfd, section );
359	section_filesz = ( ( flags & SEC_LOAD ) ?
360	efi_file_align ( section_memsz ) : 0 );
361	new = xmalloc ( sizeof ( *new ) + section_filesz );
362	memset ( new, 0, sizeof ( *new ) + section_filesz );
363
364	/* Fill in section header details */
365	strncpy ( ( char * ) new->hdr.Name, section->name,
366	sizeof ( new->hdr.Name ) );
367	new->hdr.Misc.VirtualSize = section_memsz;
368	new->hdr.VirtualAddress = bfd_get_section_vma ( bfd, section );
369	new->hdr.SizeOfRawData = section_filesz;
370
371	/* Fill in section characteristics and update RVA limits */
372	if ( flags & SEC_CODE ) {
373	/* .text-type section */
374	new->hdr.Characteristics =
375	( EFI_IMAGE_SCN_CNT_CODE \|
376	EFI_IMAGE_SCN_MEM_NOT_PAGED \|
377	EFI_IMAGE_SCN_MEM_EXECUTE \|
378	EFI_IMAGE_SCN_MEM_READ );
379	applicable_start = &code_start;
380	applicable_end = &code_end;
381	} else if ( flags & SEC_DATA ) {
382	/* .data-type section */
383	new->hdr.Characteristics =
384	( EFI_IMAGE_SCN_CNT_INITIALIZED_DATA \|
385	EFI_IMAGE_SCN_MEM_NOT_PAGED \|
386	EFI_IMAGE_SCN_MEM_READ \|
387	EFI_IMAGE_SCN_MEM_WRITE );
388	applicable_start = &data_start;
389	applicable_end = &data_mid;
390	} else if ( flags & SEC_READONLY ) {
391	/* .rodata-type section */
392	new->hdr.Characteristics =
393	( EFI_IMAGE_SCN_CNT_INITIALIZED_DATA \|
394	EFI_IMAGE_SCN_MEM_NOT_PAGED \|
395	EFI_IMAGE_SCN_MEM_READ );
396	applicable_start = &data_start;
397	applicable_end = &data_mid;
398	} else if ( ! ( flags & SEC_LOAD ) ) {
399	/* .bss-type section */
400	new->hdr.Characteristics =
401	( EFI_IMAGE_SCN_CNT_UNINITIALIZED_DATA \|
402	EFI_IMAGE_SCN_MEM_NOT_PAGED \|
403	EFI_IMAGE_SCN_MEM_READ \|
404	EFI_IMAGE_SCN_MEM_WRITE );
405	applicable_start = &data_mid;
406	applicable_end = &data_end;
407	}
408
409	/* Copy in section contents */
410	if ( flags & SEC_LOAD ) {
411	if ( ! bfd_get_section_contents ( bfd, section, new->contents,
412	0, section_memsz ) ) {
413	eprintf ( "Cannot read section %s: ", section->name );
414	bfd_perror ( NULL );
415	exit ( 1 );
416	}
417	}
418
419	/* Update RVA limits */
420	start = new->hdr.VirtualAddress;
421	end = ( start + new->hdr.Misc.VirtualSize );
422	if ( ( ! applicable_start ) \|\| ( applicable_start >= start ) )
423	*applicable_start = start;
424	if ( *applicable_end < end )
425	*applicable_end = end;
426	if ( data_start < code_end )
427	data_start = code_end;
428	if ( data_mid < data_start )
429	data_mid = data_start;
430	if ( data_end < data_mid )
431	data_end = data_mid;
432
433	/* Write RVA limits back to file header */
434	pe_header->nt.OptionalHeader.BaseOfCode = code_start;
435	pe_header->nt.OptionalHeader.SizeOfCode = ( code_end - code_start );
436	#if defined(MDE_CPU_IA32)
437	pe_header->nt.OptionalHeader.BaseOfData = data_start;
438	#endif
439	pe_header->nt.OptionalHeader.SizeOfInitializedData =
440	( data_mid - data_start );
441	pe_header->nt.OptionalHeader.SizeOfUninitializedData =
442	( data_end - data_mid );
443
444	/* Update remaining file header fields */
445	pe_header->nt.FileHeader.NumberOfSections++;
446	pe_header->nt.OptionalHeader.SizeOfHeaders += sizeof ( new->hdr );
447	pe_header->nt.OptionalHeader.SizeOfImage =
448	efi_file_align ( data_end );
449
450	return new;
451	}
452
453	/**
454	* Process relocation record
455	*
456	* @v bfd BFD file
457	* @v section Section
458	* @v rel Relocation entry
459	* @v pe_reltab PE relocation table to fill in
460	*/
461	static void process_reloc ( bfd bfd, asection section, arelent *rel,
462	struct pe_relocs **pe_reltab ) {
463	reloc_howto_type *howto = rel->howto;
464	asymbol sym = (rel->sym_ptr_ptr);
465	unsigned long offset = ( bfd_get_section_vma ( bfd, section ) +
466	rel->address );
467
468	if ( bfd_is_abs_section ( sym->section ) ) {
469	/* Skip absolute symbols; the symbol value won't
470	* change when the object is loaded.
471	*/
472	} else if ( strcmp ( howto->name, "R_X86_64_64" ) == 0 ) {
473	/* Generate an 8-byte PE relocation */
474	generate_pe_reloc ( pe_reltab, offset, 8 );
475	} else if ( ( strcmp ( howto->name, "R_386_32" ) == 0 ) \|\|
476	( strcmp ( howto->name, "R_X86_64_32" ) == 0 ) ) {
477	/* Generate a 4-byte PE relocation */
478	generate_pe_reloc ( pe_reltab, offset, 4 );
479	} else if ( strcmp ( howto->name, "R_386_16" ) == 0 ) {
480	/* Generate a 2-byte PE relocation */
481	generate_pe_reloc ( pe_reltab, offset, 2 );
482	} else if ( ( strcmp ( howto->name, "R_386_PC32" ) == 0 ) \|\|
483	( strcmp ( howto->name, "R_X86_64_PC32" ) == 0 ) ) {
484	/* Skip PC-relative relocations; all relative offsets
485	* remain unaltered when the object is loaded.
486	*/
487	} else {
488	eprintf ( "Unrecognised relocation type %s\n", howto->name );
489	exit ( 1 );
490	}
491	}
492
493	/**
494	* Create relocations section
495	*
496	* @v pe_header PE file header
497	* @v pe_reltab PE relocation table
498	* @ret section Relocation section
499	*/
500	static struct pe_section *
501	create_reloc_section ( struct pe_header *pe_header,
502	struct pe_relocs *pe_reltab ) {
503	struct pe_section *reloc;
504	size_t section_memsz;
505	size_t section_filesz;
506	EFI_IMAGE_DATA_DIRECTORY *relocdir;
507
508	/* Allocate PE section */
509	section_memsz = output_pe_reltab ( pe_reltab, NULL );
510	section_filesz = efi_file_align ( section_memsz );
511	reloc = xmalloc ( sizeof ( *reloc ) + section_filesz );
512	memset ( reloc, 0, sizeof ( *reloc ) + section_filesz );
513
514	/* Fill in section header details */
515	strncpy ( ( char * ) reloc->hdr.Name, ".reloc",
516	sizeof ( reloc->hdr.Name ) );
517	reloc->hdr.Misc.VirtualSize = section_memsz;
518	reloc->hdr.VirtualAddress = pe_header->nt.OptionalHeader.SizeOfImage;
519	reloc->hdr.SizeOfRawData = section_filesz;
520	reloc->hdr.Characteristics = ( EFI_IMAGE_SCN_CNT_INITIALIZED_DATA \|
521	EFI_IMAGE_SCN_MEM_NOT_PAGED \|
522	EFI_IMAGE_SCN_MEM_READ );
523
524	/* Copy in section contents */
525	output_pe_reltab ( pe_reltab, reloc->contents );
526
527	/* Update file header details */
528	pe_header->nt.FileHeader.NumberOfSections++;
529	pe_header->nt.OptionalHeader.SizeOfHeaders += sizeof ( reloc->hdr );
530	pe_header->nt.OptionalHeader.SizeOfImage += section_filesz;
531	relocdir = &(pe_header->nt.OptionalHeader.DataDirectory
532	[EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC]);
533	relocdir->VirtualAddress = reloc->hdr.VirtualAddress;
534	relocdir->Size = reloc->hdr.Misc.VirtualSize;
535
536	return reloc;
537	}
538
539	/**
540	* Create debug section
541	*
542	* @v pe_header PE file header
543	* @ret section Debug section
544	*/
545	static struct pe_section *
546	create_debug_section ( struct pe_header pe_header, const char filename ) {
547	struct pe_section *debug;
548	size_t section_memsz;
549	size_t section_filesz;
550	EFI_IMAGE_DATA_DIRECTORY *debugdir;
551	struct {
552	EFI_IMAGE_DEBUG_DIRECTORY_ENTRY debug;
553	EFI_IMAGE_DEBUG_CODEVIEW_RSDS_ENTRY rsds;
554	char name[ strlen ( filename ) + 1 ];
555	} *contents;
556
557	/* Allocate PE section */
558	section_memsz = sizeof ( *contents );
559	section_filesz = efi_file_align ( section_memsz );
560	debug = xmalloc ( sizeof ( *debug ) + section_filesz );
561	memset ( debug, 0, sizeof ( *debug ) + section_filesz );
562	contents = ( void * ) debug->contents;
563
564	/* Fill in section header details */
565	strncpy ( ( char * ) debug->hdr.Name, ".debug",
566	sizeof ( debug->hdr.Name ) );
567	debug->hdr.Misc.VirtualSize = section_memsz;
568	debug->hdr.VirtualAddress = pe_header->nt.OptionalHeader.SizeOfImage;
569	debug->hdr.SizeOfRawData = section_filesz;
570	debug->hdr.Characteristics = ( EFI_IMAGE_SCN_CNT_INITIALIZED_DATA \|
571	EFI_IMAGE_SCN_MEM_NOT_PAGED \|
572	EFI_IMAGE_SCN_MEM_READ );
573
574	/* Create section contents */
575	contents->debug.TimeDateStamp = 0x10d1a884;
576	contents->debug.Type = EFI_IMAGE_DEBUG_TYPE_CODEVIEW;
577	contents->debug.SizeOfData =
578	( sizeof ( *contents ) - sizeof ( contents->debug ) );
579	contents->debug.RVA = ( debug->hdr.VirtualAddress +
580	offsetof ( typeof ( *contents ), rsds ) );
581	contents->rsds.Signature = CODEVIEW_SIGNATURE_RSDS;
582	snprintf ( contents->name, sizeof ( contents->name ), "%s",
583	filename );
584
585	/* Update file header details */
586	pe_header->nt.FileHeader.NumberOfSections++;
587	pe_header->nt.OptionalHeader.SizeOfHeaders += sizeof ( debug->hdr );
588	pe_header->nt.OptionalHeader.SizeOfImage += section_filesz;
589	debugdir = &(pe_header->nt.OptionalHeader.DataDirectory
590	[EFI_IMAGE_DIRECTORY_ENTRY_DEBUG]);
591	debugdir->VirtualAddress = debug->hdr.VirtualAddress;
592	debugdir->Size = debug->hdr.Misc.VirtualSize;
593
594	return debug;
595	}
596
597	/**
598	* Write out PE file
599	*
600	* @v pe_header PE file header
601	* @v pe_sections List of PE sections
602	* @v pe Output file
603	*/
604	static void write_pe_file ( struct pe_header *pe_header,
605	struct pe_section *pe_sections,
606	FILE *pe ) {
607	struct pe_section *section;
608	unsigned long fpos = 0;
609
610	/* Assign raw data pointers */
611	fpos = efi_file_align ( pe_header->nt.OptionalHeader.SizeOfHeaders );
612	for ( section = pe_sections ; section ; section = section->next ) {
613	if ( section->hdr.SizeOfRawData ) {
614	section->hdr.PointerToRawData = fpos;
615	fpos += section->hdr.SizeOfRawData;
616	fpos = efi_file_align ( fpos );
617	}
618	}
619
620	/* Write file header */
621	if ( fwrite ( pe_header, sizeof ( *pe_header ), 1, pe ) != 1 ) {
622	perror ( "Could not write PE header" );
623	exit ( 1 );
624	}
625
626	/* Write section headers */
627	for ( section = pe_sections ; section ; section = section->next ) {
628	if ( fwrite ( &section->hdr, sizeof ( section->hdr ),
629	1, pe ) != 1 ) {
630	perror ( "Could not write section header" );
631	exit ( 1 );
632	}
633	}
634
635	/* Write sections */
636	for ( section = pe_sections ; section ; section = section->next ) {
637	if ( fseek ( pe, section->hdr.PointerToRawData,
638	SEEK_SET ) != 0 ) {
639	eprintf ( "Could not seek to %lx: %s\n",
640	section->hdr.PointerToRawData,
641	strerror ( errno ) );
642	exit ( 1 );
643	}
644	if ( section->hdr.SizeOfRawData &&
645	( fwrite ( section->contents, section->hdr.SizeOfRawData,
646	1, pe ) != 1 ) ) {
647	eprintf ( "Could not write section %.8s: %s\n",
648	section->hdr.Name, strerror ( errno ) );
649	exit ( 1 );
650	}
651	}
652	}
653
654	/**
655	* Convert ELF to PE
656	*
657	* @v elf_name ELF file name
658	* @v pe_name PE file name
659	*/
660	static void elf2pe ( const char elf_name, const char pe_name,
661	struct options *opts ) {
662	char pe_name_tmp[ strlen ( pe_name ) + 1 ];
663	bfd *bfd;
664	asymbol **symtab;
665	asection *section;
666	arelent **reltab;
667	arelent **rel;
668	struct pe_relocs *pe_reltab = NULL;
669	struct pe_section *pe_sections = NULL;
670	struct pe_section **next_pe_section = &pe_sections;
671	struct pe_header pe_header;
672	FILE *pe;
673
674	/* Create a modifiable copy of the PE name */
675	memcpy ( pe_name_tmp, pe_name, sizeof ( pe_name_tmp ) );
676
677	/* Open the file */
678	bfd = open_input_bfd ( elf_name );
679	symtab = read_symtab ( bfd );
680
681	/* Initialise the PE header */
682	memcpy ( &pe_header, &efi_pe_header, sizeof ( pe_header ) );
683	pe_header.nt.OptionalHeader.AddressOfEntryPoint =
684	bfd_get_start_address ( bfd );
685	pe_header.nt.OptionalHeader.Subsystem = opts->subsystem;
686
687	/* For each input section, build an output section and create
688	* the appropriate relocation records
689	*/
690	for ( section = bfd->sections ; section ; section = section->next ) {
691	/* Discard non-allocatable sections */
692	if ( ! ( bfd_get_section_flags ( bfd, section ) & SEC_ALLOC ) )
693	continue;
694	/* Create output section */
695	*(next_pe_section) = process_section ( bfd, &pe_header,
696	section );
697	next_pe_section = &(*next_pe_section)->next;
698	/* Add relocations from this section */
699	reltab = read_reltab ( bfd, symtab, section );
700	for ( rel = reltab ; *rel ; rel++ )
701	process_reloc ( bfd, section, *rel, &pe_reltab );
702	free ( reltab );
703	}
704
705	/* Create the .reloc section */
706	*(next_pe_section) = create_reloc_section ( &pe_header, pe_reltab );
707	next_pe_section = &(*next_pe_section)->next;
708
709	/* Create the .reloc section */
710	*(next_pe_section) = create_debug_section ( &pe_header,
711	basename ( pe_name_tmp ) );
712	next_pe_section = &(*next_pe_section)->next;
713
714	/* Write out PE file */
715	pe = fopen ( pe_name, "w" );
716	if ( ! pe ) {
717	eprintf ( "Could not open %s for writing: %s\n",
718	pe_name, strerror ( errno ) );
719	exit ( 1 );
720	}
721	write_pe_file ( &pe_header, pe_sections, pe );
722	fclose ( pe );
723
724	/* Close BFD file */
725	bfd_close ( bfd );
726	}
727
728	/**
729	* Print help
730	*
731	* @v program_name Program name
732	*/
733	static void print_help ( const char *program_name ) {
734	eprintf ( "Syntax: %s [--subsystem=<number>] infile outfile\n",
735	program_name );
736	}
737
738	/**
739	* Parse command-line options
740	*
741	* @v argc Argument count
742	* @v argv Argument list
743	* @v opts Options structure to populate
744	*/
745	static int parse_options ( const int argc, char **argv,
746	struct options *opts ) {
747	char *end;
748	int c;
749
750	while (1) {
751	int option_index = 0;
752	static struct option long_options[] = {
753	{ "subsystem", required_argument, NULL, 's' },
754	{ "help", 0, NULL, 'h' },
755	{ 0, 0, 0, 0 }
756	};
757
758	if ( ( c = getopt_long ( argc, argv, "s:h",
759	long_options,
760	&option_index ) ) == -1 ) {
761	break;
762	}
763
764	switch ( c ) {
765	case 's':
766	opts->subsystem = strtoul ( optarg, &end, 0 );
767	if ( *end ) {
768	eprintf ( "Invalid subsytem \"%s\"\n",
769	optarg );
770	exit ( 2 );
771	}
772	break;
773	case 'h':
774	print_help ( argv[0] );
775	exit ( 0 );
776	case '?':
777	default:
778	exit ( 2 );
779	}
780	}
781	return optind;
782	}
783
784	int main ( int argc, char **argv ) {
785	struct options opts = {
786	.subsystem = EFI_IMAGE_SUBSYSTEM_EFI_APPLICATION,
787	};
788	unsigned int infile_index;
789	const char *infile;
790	const char *outfile;
791
792	/* Initialise libbfd */
793	bfd_init();
794
795	/* Parse command-line arguments */
796	infile_index = parse_options ( argc, argv, &opts );
797	if ( argc != ( infile_index + 2 ) ) {
798	print_help ( argv[0] );
799	exit ( 2 );
800	}
801	infile = argv[infile_index];
802	outfile = argv[infile_index + 1];
803
804	/* Convert file */
805	elf2pe ( infile, outfile, &opts );
806
807	return 0;
808	}

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