cctools/include/mach-o/fat.h

   1 /*
   2  * Copyright (c) 2016 Apple, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 #ifndef _MACH_O_FAT_H_
  24 #define _MACH_O_FAT_H_
  25 /*
  26  * This header file describes the structures of the file format for "fat"
  27  * architecture specific file (wrapper design).  At the begining of the file
  28  * there is one fat_header structure followed by a number of fat_arch
  29  * structures.  For each architecture in the file, specified by a pair of
  30  * cputype and cpusubtype, the fat_header describes the file offset, file
  31  * size and alignment in the file of the architecture specific member.
  32  * The padded bytes in the file to place each member on it's specific alignment
  33  * are defined to be read as zeros and can be left as "holes" if the file system
  34  * can support them as long as they read as zeros.
  35  *
  36  * All structures defined here are always written and read to/from disk
  37  * in big-endian order.
  38  */
  39
  40 /*
  41  * <mach/machine.h> is needed here for the cpu_type_t and cpu_subtype_t types
  42  * and contains the constants for the possible values of these types.
  43  */
  44 #include <stdint.h>
  45 #include <mach/machine.h>
  46 #include <architecture/byte_order.h>
  47
  48 #define FAT_MAGIC       0xcafebabe
  49 #define FAT_CIGAM       0xbebafeca      /* NXSwapLong(FAT_MAGIC) */
  50
  51 struct fat_header {
  52         uint32_t        magic;          /* FAT_MAGIC or FAT_MAGIC_64 */
  53         uint32_t        nfat_arch;      /* number of structs that follow */
  54 };
  55
  56 struct fat_arch {
  57         cpu_type_t      cputype;        /* cpu specifier (int) */
  58         cpu_subtype_t   cpusubtype;     /* machine specifier (int) */
  59         uint32_t        offset;         /* file offset to this object file */
  60         uint32_t        size;           /* size of this object file */
  61         uint32_t        align;          /* alignment as a power of 2 */
  62 };
  63
  64 /*
  65  * The support for the 64-bit fat file format described here is a work in
  66  * progress and not yet fully supported in all the Apple Developer Tools.
  67  *
  68  * When a slice is greater than 4mb or an offset to a slice is greater than 4mb
  69  * then the 64-bit fat file format is used.
  70  */
  71 #define FAT_MAGIC_64    0xcafebabf
  72 #define FAT_CIGAM_64    0xbfbafeca      /* NXSwapLong(FAT_MAGIC_64) */
  73
  74 struct fat_arch_64 {
  75         cpu_type_t      cputype;        /* cpu specifier (int) */
  76         cpu_subtype_t   cpusubtype;     /* machine specifier (int) */
  77         uint64_t        offset;         /* file offset to this object file */
  78         uint64_t        size;           /* size of this object file */
  79         uint32_t        align;          /* alignment as a power of 2 */
  80         uint32_t        reserved;       /* reserved */
  81 };
  82
  83 #endif /* _MACH_O_FAT_H_ */