| 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; |