| 1 | /*␊ |
| 2 | * Copyright (c) 1999 Apple Computer, 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 | ␊ |
| 24 | #ifndef _MACHO_LDSYMS_H_␊ |
| 25 | #define _MACHO_LDSYMS_H_␊ |
| 26 | ␊ |
| 27 | #include <mach-o/loader.h>␊ |
| 28 | ␊ |
| 29 | /*␊ |
| 30 | * This file describes the link editor defined symbols. The semantics of a␊ |
| 31 | * link editor symbol is that it is defined by the link editor only if it is␊ |
| 32 | * referenced and it is an error for the user to define them (see the man page␊ |
| 33 | * ld(1)). The standard UNIX link editor symbols: __end, __etext and __edata␊ |
| 34 | * are not not supported by the Apple Mach-O link editor. These symbols are␊ |
| 35 | * really not meaningful in a Mach-O object file and the link editor symbols␊ |
| 36 | * that are supported (described here) replace them. In the case of the␊ |
| 37 | * standard UNIX link editor symbols the program can use the symbol␊ |
| 38 | * __mh_execute_header and walk the load commands of it's program to determine␊ |
| 39 | * the ending (or beginning) of any section or segment in the program. Note␊ |
| 40 | * that the compiler prepends an underbar to all external symbol names coded␊ |
| 41 | * in a high level language. Thus in 'C' names are coded without an underbar␊ |
| 42 | * and symbol names in the symbol table have an underbar. There are two cpp␊ |
| 43 | * macros for each link editor defined name in this file. The macro with a␊ |
| 44 | * leading underbar is the symbol name and the one without is the name as␊ |
| 45 | * coded in 'C'.␊ |
| 46 | */␊ |
| 47 | ␊ |
| 48 | /*␊ |
| 49 | * The value of the link editor defined symbol _MH_EXECUTE_SYM is the address␊ |
| 50 | * of the mach header in a Mach-O executable file type. It does not appear in␊ |
| 51 | * any file type other than a MH_EXECUTE file type. The type of the symbol is␊ |
| 52 | * absolute as the header is not part of any section.␊ |
| 53 | */␊ |
| 54 | #define _MH_EXECUTE_SYM␉"__mh_execute_header"␊ |
| 55 | #define MH_EXECUTE_SYM␉"_mh_execute_header"␊ |
| 56 | extern const struct␊ |
| 57 | #ifdef __LP64__␊ |
| 58 | mach_header_64␊ |
| 59 | #else␊ |
| 60 | mach_header␊ |
| 61 | #endif␊ |
| 62 | _mh_execute_header;␊ |
| 63 | ␊ |
| 64 | /*␊ |
| 65 | * The value of the link editor defined symbol _MH_BUNDLE_SYM is the address␊ |
| 66 | * of the mach header in a Mach-O bundle file type. It does not appear in␊ |
| 67 | * any file type other than a MH_BUNDLE file type. The type of the symbol is␊ |
| 68 | * an N_SECT symbol even thought the header is not part of any section. This␊ |
| 69 | * symbol is private to the code in the bundle it is a part of.␊ |
| 70 | */␊ |
| 71 | #define _MH_BUNDLE_SYM␉"__mh_bundle_header"␊ |
| 72 | #define MH_BUNDLE_SYM␉"_mh_bundle_header"␊ |
| 73 | extern const struct␊ |
| 74 | #ifdef __LP64__␊ |
| 75 | mach_header_64␊ |
| 76 | #else␊ |
| 77 | mach_header␊ |
| 78 | #endif␊ |
| 79 | _mh_bundle_header;␊ |
| 80 | ␊ |
| 81 | /*␊ |
| 82 | * The value of the link editor defined symbol _MH_DYLIB_SYM is the address␊ |
| 83 | * of the mach header in a Mach-O dylib file type. It does not appear in␊ |
| 84 | * any file type other than a MH_DYLIB file type. The type of the symbol is␊ |
| 85 | * an N_SECT symbol even thought the header is not part of any section. This␊ |
| 86 | * symbol is private to the code in the library it is a part of.␊ |
| 87 | */␊ |
| 88 | #define _MH_DYLIB_SYM␉"__mh_dylib_header"␊ |
| 89 | #define MH_DYLIB_SYM␉"_mh_dylib_header"␊ |
| 90 | extern const struct␊ |
| 91 | #ifdef __LP64__␊ |
| 92 | mach_header_64␊ |
| 93 | #else␊ |
| 94 | mach_header␊ |
| 95 | #endif␊ |
| 96 | _mh_dylib_header;␊ |
| 97 | ␊ |
| 98 | /*␊ |
| 99 | * The value of the link editor defined symbol _MH_DYLINKER_SYM is the address␊ |
| 100 | * of the mach header in a Mach-O dylinker file type. It does not appear in␊ |
| 101 | * any file type other than a MH_DYLINKER file type. The type of the symbol is␊ |
| 102 | * an N_SECT symbol even thought the header is not part of any section. This␊ |
| 103 | * symbol is private to the code in the dynamic linker it is a part of.␊ |
| 104 | */␊ |
| 105 | #define _MH_DYLINKER_SYM␉"__mh_dylinker_header"␊ |
| 106 | #define MH_DYLINKER_SYM␉␉"_mh_dylinker_header"␊ |
| 107 | extern const struct␊ |
| 108 | #ifdef __LP64__␊ |
| 109 | mach_header_64␊ |
| 110 | #else␊ |
| 111 | mach_header␊ |
| 112 | #endif␊ |
| 113 | _mh_dylinker_header;␊ |
| 114 | ␊ |
| 115 | /*␊ |
| 116 | * For the MH_PRELOAD file type the headers are not loaded as part of any␊ |
| 117 | * segment so the link editor defines symbols defined for the beginning␊ |
| 118 | * and ending of each segment and each section in each segment. The names for␊ |
| 119 | * the symbols for a segment's beginning and end will have the form:␊ |
| 120 | * __SEGNAME__begin and __SEGNAME__end where __SEGNAME is the name of the␊ |
| 121 | * segment. The names for the symbols for a section's beginning and end will␊ |
| 122 | * have the form: __SEGNAME__sectname__begin and __SEGNAME__sectname__end␊ |
| 123 | * where __sectname is the name of the section and __SEGNAME is the segment it␊ |
| 124 | * is in.␊ |
| 125 | * ␊ |
| 126 | * The above symbols' types are those of the section they are referring to.␊ |
| 127 | * This is true even for symbols who's values are end's of a section and␊ |
| 128 | * that value is next address after that section and not really in that␊ |
| 129 | * section. This results in these symbols having types referring to sections␊ |
| 130 | * who's values are not in that section.␊ |
| 131 | */␊ |
| 132 | ␊ |
| 133 | #endif /* _MACHO_LDSYMS_H_ */␊ |
| 134 | |
