1 /* Alpha NLM (NetWare Loadable Module) support for BFD. 2 Copyright 1993 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21 /* An Alpha NLM starts with an instance of this structure. */ 22 23 struct nlm32_alpha_external_prefix_header 24 { 25 /* Magic number. Must be NLM32_ALPHA_MAGIC. */ 26 unsigned char magic[4]; 27 /* Format descriptor. Current value is 2. */ 28 unsigned char format[4]; 29 /* Size of prefix header. */ 30 unsigned char size[4]; 31 /* Padding. */ 32 unsigned char pad1[4]; 33 /* More fields may be added later, supposedly. */ 34 }; 35 36 /* The external format of an Alpha NLM reloc. This is the same as an 37 Alpha ECOFF reloc. */ 38 39 struct nlm32_alpha_external_reloc 40 { 41 unsigned char r_vaddr[8]; 42 unsigned char r_symndx[4]; 43 unsigned char r_bits[4]; 44 }; 45 46 /* Constants to unpack the r_bits field of a reloc. */ 47 48 #define RELOC_BITS0_TYPE_LITTLE 0xff 49 #define RELOC_BITS0_TYPE_SH_LITTLE 0 50 51 #define RELOC_BITS1_EXTERN_LITTLE 0x01 52 53 #define RELOC_BITS1_OFFSET_LITTLE 0x7e 54 #define RELOC_BITS1_OFFSET_SH_LITTLE 1 55 56 #define RELOC_BITS1_RESERVED_LITTLE 0x80 57 #define RELOC_BITS1_RESERVED_SH_LITTLE 7 58 #define RELOC_BITS2_RESERVED_LITTLE 0xff 59 #define RELOC_BITS2_RESERVED_SH_LEFT_LITTLE 1 60 #define RELOC_BITS3_RESERVED_LITTLE 0x03 61 #define RELOC_BITS3_RESERVED_SH_LEFT_LITTLE 9 62 63 #define RELOC_BITS3_SIZE_LITTLE 0xfc 64 #define RELOC_BITS3_SIZE_SH_LITTLE 2 65 66 /* The external format of the fixed header. */ 67 68 typedef struct nlm32_alpha_external_fixed_header 69 { 70 71 /* The signature field identifies the file as an NLM. It must contain 72 the signature string, which depends upon the NLM target. */ 73 74 unsigned char signature[24]; 75 76 /* The version of the header. At this time, the highest version number 77 is 4. */ 78 79 unsigned char version[4]; 80 81 /* The name of the module, which must be a DOS name (1-8 characters followed 82 by a period and a 1-3 character extension). The first byte is the byte 83 length of the name and the last byte is a null terminator byte. This 84 field is fixed length, and any unused bytes should be null bytes. The 85 value is set by the OUTPUT keyword to NLMLINK. */ 86 87 unsigned char moduleName[14]; 88 89 /* Padding to make it come out correct. */ 90 91 unsigned char pad1[2]; 92 93 /* The byte offset of the code image from the start of the file. */ 94 95 unsigned char codeImageOffset[4]; 96 97 /* The size of the code image, in bytes. */ 98 99 unsigned char codeImageSize[4]; 100 101 /* The byte offset of the data image from the start of the file. */ 102 103 unsigned char dataImageOffset[4]; 104 105 /* The size of the data image, in bytes. */ 106 107 unsigned char dataImageSize[4]; 108 109 /* The size of the uninitialized data region that the loader is to be 110 allocated at load time. Uninitialized data follows the initialized 111 data in the NLM address space. */ 112 113 unsigned char uninitializedDataSize[4]; 114 115 /* The byte offset of the custom data from the start of the file. The 116 custom data is set by the CUSTOM keyword to NLMLINK. It is possible 117 for this to be EOF if there is no custom data. */ 118 119 unsigned char customDataOffset[4]; 120 121 /* The size of the custom data, in bytes. */ 122 123 unsigned char customDataSize[4]; 124 125 /* The byte offset of the module dependencies from the start of the file. 126 The module dependencies are determined by the MODULE keyword in 127 NLMLINK. */ 128 129 unsigned char moduleDependencyOffset[4]; 130 131 /* The number of module dependencies at the moduleDependencyOffset. */ 132 133 unsigned char numberOfModuleDependencies[4]; 134 135 /* The byte offset of the relocation fixup data from the start of the file */ 136 137 unsigned char relocationFixupOffset[4]; 138 139 unsigned char numberOfRelocationFixups[4]; 140 141 unsigned char externalReferencesOffset[4]; 142 143 unsigned char numberOfExternalReferences[4]; 144 145 unsigned char publicsOffset[4]; 146 147 unsigned char numberOfPublics[4]; 148 149 /* The byte offset of the internal debug info from the start of the file. 150 It is possible for this to be EOF if there is no debug info. */ 151 152 unsigned char debugInfoOffset[4]; 153 154 unsigned char numberOfDebugRecords[4]; 155 156 unsigned char codeStartOffset[4]; 157 158 unsigned char exitProcedureOffset[4]; 159 160 unsigned char checkUnloadProcedureOffset[4]; 161 162 unsigned char moduleType[4]; 163 164 unsigned char flags[4]; 165 166 } Nlm32_alpha_External_Fixed_Header; 167