1 /* PowerPC NLM (NetWare Loadable Module) support for BFD. 2 Copyright (C) 1994-2014 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 #ifdef OLDFORMAT 22 23 /* The format of a PowerPC NLM changed. These structures are only 24 used in the old format. */ 25 26 /* A PowerPC NLM starts with an instance of this structure. */ 27 28 struct nlm32_powerpc_external_prefix_header 29 { 30 /* Signature. Must be "AppleNLM". */ 31 char signature[8]; 32 /* Version number. Current value is 1. */ 33 unsigned char headerVersion[4]; 34 /* ??. Should be set to 0. */ 35 unsigned char origins[4]; 36 /* File creation date in standard Unix time format (seconds since 37 1/1/70). */ 38 unsigned char date[4]; 39 }; 40 41 #define NLM32_POWERPC_SIGNATURE "AppleNLM" 42 #define NLM32_POWERPC_HEADER_VERSION 1 43 44 /* The external format of a PowerPC NLM reloc. This is the same as an 45 XCOFF dynamic reloc. */ 46 47 struct nlm32_powerpc_external_reloc 48 { 49 /* Address. */ 50 unsigned char l_vaddr[4]; 51 /* Symbol table index. This is 0 for .text and 1 for .data. 2 52 means .bss, but I don't know if it is used. In XCOFF, larger 53 numbers are indices into the dynamic symbol table, but they are 54 presumably not used in an NLM. */ 55 unsigned char l_symndx[4]; 56 /* Relocation type. */ 57 unsigned char l_rtype[2]; 58 /* Section number being relocated. */ 59 unsigned char l_rsecnm[2]; 60 }; 61 62 #endif /* OLDFORMAT */ 63 64 /* The external format of the fixed header. */ 65 66 typedef struct nlm32_powerpc_external_fixed_header 67 { 68 69 /* The signature field identifies the file as an NLM. It must contain 70 the signature string, which depends upon the NLM target. */ 71 72 unsigned char signature[24]; 73 74 /* The version of the header. At this time, the highest version number 75 is 4. */ 76 77 unsigned char version[4]; 78 79 /* The name of the module, which must be a DOS name (1-8 characters followed 80 by a period and a 1-3 character extension). The first byte is the byte 81 length of the name and the last byte is a null terminator byte. This 82 field is fixed length, and any unused bytes should be null bytes. The 83 value is set by the OUTPUT keyword to NLMLINK. */ 84 85 unsigned char moduleName[14]; 86 87 /* Padding to make it come out correct. */ 88 89 unsigned char pad1[2]; 90 91 /* The byte offset of the code image from the start of the file. */ 92 93 unsigned char codeImageOffset[4]; 94 95 /* The size of the code image, in bytes. */ 96 97 unsigned char codeImageSize[4]; 98 99 /* The byte offset of the data image from the start of the file. */ 100 101 unsigned char dataImageOffset[4]; 102 103 /* The size of the data image, in bytes. */ 104 105 unsigned char dataImageSize[4]; 106 107 /* The size of the uninitialized data region that the loader is to be 108 allocated at load time. Uninitialized data follows the initialized 109 data in the NLM address space. */ 110 111 unsigned char uninitializedDataSize[4]; 112 113 /* The byte offset of the custom data from the start of the file. The 114 custom data is set by the CUSTOM keyword to NLMLINK. It is possible 115 for this to be EOF if there is no custom data. */ 116 117 unsigned char customDataOffset[4]; 118 119 /* The size of the custom data, in bytes. */ 120 121 unsigned char customDataSize[4]; 122 123 /* The byte offset of the module dependencies from the start of the file. 124 The module dependencies are determined by the MODULE keyword in 125 NLMLINK. */ 126 127 unsigned char moduleDependencyOffset[4]; 128 129 /* The number of module dependencies at the moduleDependencyOffset. */ 130 131 unsigned char numberOfModuleDependencies[4]; 132 133 /* The byte offset of the relocation fixup data from the start of the file */ 134 135 unsigned char relocationFixupOffset[4]; 136 137 unsigned char numberOfRelocationFixups[4]; 138 139 unsigned char externalReferencesOffset[4]; 140 141 unsigned char numberOfExternalReferences[4]; 142 143 unsigned char publicsOffset[4]; 144 145 unsigned char numberOfPublics[4]; 146 147 /* The byte offset of the internal debug info from the start of the file. 148 It is possible for this to be EOF if there is no debug info. */ 149 150 unsigned char debugInfoOffset[4]; 151 152 unsigned char numberOfDebugRecords[4]; 153 154 unsigned char codeStartOffset[4]; 155 156 unsigned char exitProcedureOffset[4]; 157 158 unsigned char checkUnloadProcedureOffset[4]; 159 160 unsigned char moduleType[4]; 161 162 unsigned char flags[4]; 163 164 } Nlm32_powerpc_External_Fixed_Header; 165