[efi] Add efifatbin utility

Add utility for constructing EFI fat binaries (dual 32/64-bit
binaries, usable only on Apple EFI systems).

This utility is not part of the standard build process.  To use it:

  make util/efifatbin bin-i386-efi/ipxe.efi bin-x86_64-efi/ipxe.efi

and then

  ./util/efifatbin bin-*-efi/ipxe.efi fat-ipxe.efi

Requested-by: Brandon Penglase <bpenglase-ipxe@spaceservices.net>
Tested-by: Brandon Penglase <bpenglase-ipxe@spaceservices.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/Makefile

@@ -46,6 +46,7 @@ ZBIN		:= ./util/zbin
 ELF2EFI32	:= ./util/elf2efi32
 ELF2EFI64	:= ./util/elf2efi64
 EFIROM		:= ./util/efirom
+EFIFATBIN	:= ./util/efifatbin
 ICCFIX		:= ./util/iccfix
 EINFO		:= ./util/einfo
 GENKEYMAP	:= ./util/genkeymap.pl

src/Makefile.housekeeping

@@ -1268,6 +1268,11 @@ $(EFIROM) : util/efirom.c $(MAKEDEPS)
 	$(Q)$(HOST_CC) $(HOST_CFLAGS) -idirafter include -o $@ $<
 CLEANUP += $(EFIROM)
 
+$(EFIFATBIN) : util/efifatbin.c $(MAKEDEPS)
+	$(QM)$(ECHO) "  [HOSTCC] $@"
+	$(Q)$(HOST_CC) $(HOST_CFLAGS) -idirafter include -o $@ $<
+CLEANUP += $(EFIFATBIN)
+
 ###############################################################################
 #
 # The ICC fixup utility

src/util/.gitignore

@@ -5,5 +5,6 @@ prototester
 elf2efi32
 elf2efi64
 efirom
+efifatbin
 iccfix
 einfo

src/util/efifatbin.c

@@ -0,0 +1,260 @@
+/*
+ * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <assert.h>
+#include <getopt.h>
+#include <ipxe/efi/efi.h>
+#include <ipxe/efi/IndustryStandard/PeImage.h>
+
+#define eprintf(...) fprintf ( stderr, __VA_ARGS__ )
+
+/** Command-line options */
+struct options {
+};
+
+/** EFI fat binary file header */
+struct efifatbin_file_header {
+	/** Signature */
+	uint32_t signature;
+	/** Count */
+	uint32_t count;
+} __attribute__ (( packed ));
+
+/** EFI fat binary signature */
+#define EFIFATBIN_SIGNATURE 0x0ef1fab9
+
+/** EFI fat binary image header */
+struct efifatbin_image_header {
+	/** Flags */
+	uint64_t flags;
+	/** Offset */
+	uint32_t offset;
+	/** Length */
+	uint32_t len;
+	/** Padding */
+	uint32_t pad;
+} __attribute__ (( packed ));
+
+/** EFI fat binary default flags */
+#define EFIFATBIN_FLAGS 0x0000000300000007ULL
+
+/** EFI fat binary 64-bit flag */
+#define EFIFATBIN_64BIT 0x0000000001000000ULL
+
+/**
+ * Allocate memory
+ *
+ * @v len		Length of memory to allocate
+ * @ret ptr		Pointer to allocated memory
+ */
+static void * xmalloc ( size_t len ) {
+	void *ptr;
+
+	ptr = malloc ( len );
+	if ( ! ptr ) {
+		eprintf ( "Could not allocate %zd bytes\n", len );
+		exit ( 1 );
+	}
+
+	return ptr;
+}
+
+/**
+ * Generate EFI fat binary
+ *
+ * @v count		Number of input files
+ * @v infile_names	Input filenames
+ * @v outfile_name	Output filename
+ */
+static void make_efifatbin ( unsigned int count, char **infile_names,
+			     const char *outfile_name ) {
+	FILE *infile[count];
+	FILE *outfile;
+	struct stat stat[count];
+	void *buf[count];
+	struct efifatbin_file_header file_header;
+	struct efifatbin_image_header header[count];
+	size_t offset;
+	EFI_IMAGE_DOS_HEADER *dos;
+	union {
+		EFI_IMAGE_NT_HEADERS32 nt32;
+		EFI_IMAGE_NT_HEADERS64 nt64;
+	} *nt;
+	unsigned int i;
+
+	/* Generate file header */
+	file_header.signature = EFIFATBIN_SIGNATURE;
+	file_header.count = count;
+	offset = ( sizeof ( file_header ) + sizeof ( header ) );
+
+	/* Process input files */
+	for ( i = 0 ; i < count ; i++ ) {
+
+		/* Open input file */
+		infile[i] = fopen ( infile_names[i], "r" );
+		if ( ! infile[i] ) {
+			eprintf ( "Could not open %s for reading: %s\n",
+				  infile_names[i], strerror ( errno ) );
+			exit ( 1 );
+		}
+
+		/* Determine PE file size */
+		if ( fstat ( fileno ( infile[i] ), &stat[i] ) != 0 ) {
+			eprintf ( "Could not stat %s: %s\n",
+				  infile_names[i], strerror ( errno ) );
+			exit ( 1 );
+		}
+
+		/* Allocate buffer and read in PE file */
+		buf[i] = xmalloc ( stat[i].st_size );
+		if ( fread ( buf[i], stat[i].st_size, 1, infile[i] ) != 1 ) {
+			eprintf ( "Could not read %s: %s\n",
+				  infile_names[i], strerror ( errno ) );
+			exit ( 1 );
+		}
+
+		/* Close input file */
+		fclose ( infile[i] );
+
+		/* Generate image header */
+		header[i].flags = EFIFATBIN_FLAGS;
+		header[i].offset = offset;
+		header[i].len = stat[i].st_size;
+		header[i].pad = 0;
+
+		/* Determine architecture */
+		dos = buf[i];
+		nt = ( buf[i] + dos->e_lfanew );
+		if ( nt->nt32.FileHeader.Machine == EFI_IMAGE_MACHINE_X64 )
+			header[i].flags |= EFIFATBIN_64BIT;
+
+		/* Allow space for this image */
+		offset += stat[i].st_size;
+	}
+
+	/* Open output file */
+	outfile = fopen ( outfile_name, "w" );
+	if ( ! outfile ) {
+		eprintf ( "Could not open %s for writing: %s\n",
+			  outfile_name, strerror ( errno ) );
+		exit ( 1 );
+	}
+
+	/* Write fat binary header */
+	if ( fwrite ( &file_header, sizeof ( file_header ), 1, outfile ) != 1 ){
+		eprintf ( "Could not write %s: %s\n",
+			  outfile_name, strerror ( errno ) );
+		exit ( 1 );
+	}
+	for ( i = 0 ; i < count ; i++ ) {
+		if ( fwrite ( &header[i], sizeof ( header[i] ), 1,
+			      outfile ) != 1 ) {
+			eprintf ( "Could not write %s: %s\n",
+				  outfile_name, strerror ( errno ) );
+			exit ( 1 );
+		}
+	}
+
+	/* Write images */
+	for ( i = 0 ; i < count ; i++ ) {
+		if ( fwrite ( buf[i], stat[i].st_size, 1, outfile ) != 1 ) {
+			eprintf ( "Could not write %s: %s\n",
+				  outfile_name, strerror ( errno ) );
+			exit ( 1 );
+		}
+	}
+
+	/* Close output file */
+	fclose ( outfile );
+}
+
+/**
+ * Print help
+ *
+ * @v program_name	Program name
+ */
+static void print_help ( const char *program_name ) {
+	eprintf ( "Syntax: %s infile [infile...] outfile\n", program_name );
+}
+
+/**
+ * Parse command-line options
+ *
+ * @v argc		Argument count
+ * @v argv		Argument list
+ * @v opts		Options structure to populate
+ */
+static int parse_options ( const int argc, char **argv,
+			   struct options *opts __attribute__ (( unused )) ) {
+	int c;
+
+	while (1) {
+		int option_index = 0;
+		static struct option long_options[] = {
+			{ "help", 0, NULL, 'h' },
+			{ 0, 0, 0, 0 }
+		};
+
+		if ( ( c = getopt_long ( argc, argv, "h",
+					 long_options,
+					 &option_index ) ) == -1 ) {
+			break;
+		}
+
+		switch ( c ) {
+		case 'h':
+			print_help ( argv[0] );
+			exit ( 0 );
+		case '?':
+		default:
+			exit ( 2 );
+		}
+	}
+	return optind;
+}
+
+int main ( int argc, char **argv ) {
+	struct options opts;
+	int infile_index;
+	int outfile_index;
+	int count;
+
+	/* Parse command-line arguments */
+	memset ( &opts, 0, sizeof ( opts ) );
+	infile_index = parse_options ( argc, argv, &opts );
+	outfile_index = ( argc - 1 );
+	count = ( outfile_index - infile_index );
+	if ( count <= 0 ) {
+		print_help ( argv[0] );
+		exit ( 2 );
+	}
+
+	/* Generate fat binary */
+	make_efifatbin ( count, &argv[infile_index], argv[outfile_index] );
+
+	return 0;
+}