1 /* Alpha NLM (NetWare Loadable Module) support for BFD. 2 Copyright 1993, 2005, 2010 Free Software Foundation, Inc. 3 By Ian Lance Taylor, Cygnus Support 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 /* An Alpha NLM starts with an instance of this structure. */ 23 24 struct nlm32_alpha_external_prefix_header 25 { 26 /* Magic number. Must be NLM32_ALPHA_MAGIC. */ 27 unsigned char magic[4]; 28 /* Format descriptor. Current value is 2. */ 29 unsigned char format[4]; 30 /* Size of prefix header. */ 31 unsigned char size[4]; 32 /* Padding. */ 33 unsigned char pad1[4]; 34 /* More fields may be added later, supposedly. */ 35 }; 36 37 /* The external format of an Alpha NLM reloc. This is the same as an 38 Alpha ECOFF reloc. */ 39 40 struct nlm32_alpha_external_reloc 41 { 42 unsigned char r_vaddr[8]; 43 unsigned char r_symndx[4]; 44 unsigned char r_bits[4]; 45 }; 46 47 /* Constants to unpack the r_bits field of a reloc. */ 48 49 #define RELOC_BITS0_TYPE_LITTLE 0xff 50 #define RELOC_BITS0_TYPE_SH_LITTLE 0 51 52 #define RELOC_BITS1_EXTERN_LITTLE 0x01 53 54 #define RELOC_BITS1_OFFSET_LITTLE 0x7e 55 #define RELOC_BITS1_OFFSET_SH_LITTLE 1 56 57 #define RELOC_BITS1_RESERVED_LITTLE 0x80 58 #define RELOC_BITS1_RESERVED_SH_LITTLE 7 59 #define RELOC_BITS2_RESERVED_LITTLE 0xff 60 #define RELOC_BITS2_RESERVED_SH_LEFT_LITTLE 1 61 #define RELOC_BITS3_RESERVED_LITTLE 0x03 62 #define RELOC_BITS3_RESERVED_SH_LEFT_LITTLE 9 63 64 #define RELOC_BITS3_SIZE_LITTLE 0xfc 65 #define RELOC_BITS3_SIZE_SH_LITTLE 2 66 67 /* The external format of the fixed header. */ 68 69 typedef struct nlm32_alpha_external_fixed_header 70 { 71 72 /* The signature field identifies the file as an NLM. It must contain 73 the signature string, which depends upon the NLM target. */ 74 75 unsigned char signature[24]; 76 77 /* The version of the header. At this time, the highest version number 78 is 4. */ 79 80 unsigned char version[4]; 81 82 /* The name of the module, which must be a DOS name (1-8 characters followed 83 by a period and a 1-3 character extension). The first byte is the byte 84 length of the name and the last byte is a null terminator byte. This 85 field is fixed length, and any unused bytes should be null bytes. The 86 value is set by the OUTPUT keyword to NLMLINK. */ 87 88 unsigned char moduleName[14]; 89 90 /* Padding to make it come out correct. */ 91 92 unsigned char pad1[2]; 93 94 /* The byte offset of the code image from the start of the file. */ 95 96 unsigned char codeImageOffset[4]; 97 98 /* The size of the code image, in bytes. */ 99 100 unsigned char codeImageSize[4]; 101 102 /* The byte offset of the data image from the start of the file. */ 103 104 unsigned char dataImageOffset[4]; 105 106 /* The size of the data image, in bytes. */ 107 108 unsigned char dataImageSize[4]; 109 110 /* The size of the uninitialized data region that the loader is to be 111 allocated at load time. Uninitialized data follows the initialized 112 data in the NLM address space. */ 113 114 unsigned char uninitializedDataSize[4]; 115 116 /* The byte offset of the custom data from the start of the file. The 117 custom data is set by the CUSTOM keyword to NLMLINK. It is possible 118 for this to be EOF if there is no custom data. */ 119 120 unsigned char customDataOffset[4]; 121 122 /* The size of the custom data, in bytes. */ 123 124 unsigned char customDataSize[4]; 125 126 /* The byte offset of the module dependencies from the start of the file. 127 The module dependencies are determined by the MODULE keyword in 128 NLMLINK. */ 129 130 unsigned char moduleDependencyOffset[4]; 131 132 /* The number of module dependencies at the moduleDependencyOffset. */ 133 134 unsigned char numberOfModuleDependencies[4]; 135 136 /* The byte offset of the relocation fixup data from the start of the file */ 137 138 unsigned char relocationFixupOffset[4]; 139 140 unsigned char numberOfRelocationFixups[4]; 141 142 unsigned char externalReferencesOffset[4]; 143 144 unsigned char numberOfExternalReferences[4]; 145 146 unsigned char publicsOffset[4]; 147 148 unsigned char numberOfPublics[4]; 149 150 /* The byte offset of the internal debug info from the start of the file. 151 It is possible for this to be EOF if there is no debug info. */ 152 153 unsigned char debugInfoOffset[4]; 154 155 unsigned char numberOfDebugRecords[4]; 156 157 unsigned char codeStartOffset[4]; 158 159 unsigned char exitProcedureOffset[4]; 160 161 unsigned char checkUnloadProcedureOffset[4]; 162 163 unsigned char moduleType[4]; 164 165 unsigned char flags[4]; 166 167 } Nlm32_alpha_External_Fixed_Header; 168