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5191 | serge | 1 | /* Alpha NLM (NetWare Loadable Module) support for BFD. |
6324 | serge | 2 | Copyright (C) 1993-2015 Free Software Foundation, Inc. |
5191 | serge | 3 | By Ian Lance Taylor, Cygnus Support |
4 | |||
5 | This file is part of BFD, the Binary File Descriptor library. |
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6 | |||
7 | This program is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 3 of the License, or |
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10 | (at your option) any later version. |
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11 | |||
12 | This program is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |||
17 | You should have received a copy of the GNU General Public License |
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18 | along with this program; if not, write to the Free Software |
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19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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20 | MA 02110-1301, USA. */ |
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21 | |||
22 | /* An Alpha NLM starts with an instance of this structure. */ |
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23 | |||
24 | struct nlm32_alpha_external_prefix_header |
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25 | { |
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26 | /* Magic number. Must be NLM32_ALPHA_MAGIC. */ |
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27 | unsigned char magic[4]; |
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28 | /* Format descriptor. Current value is 2. */ |
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29 | unsigned char format[4]; |
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30 | /* Size of prefix header. */ |
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31 | unsigned char size[4]; |
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32 | /* Padding. */ |
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33 | unsigned char pad1[4]; |
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34 | /* More fields may be added later, supposedly. */ |
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35 | }; |
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36 | |||
37 | /* The external format of an Alpha NLM reloc. This is the same as an |
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38 | Alpha ECOFF reloc. */ |
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39 | |||
40 | struct nlm32_alpha_external_reloc |
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41 | { |
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42 | unsigned char r_vaddr[8]; |
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43 | unsigned char r_symndx[4]; |
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44 | unsigned char r_bits[4]; |
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45 | }; |
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46 | |||
47 | /* Constants to unpack the r_bits field of a reloc. */ |
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48 | |||
49 | #define RELOC_BITS0_TYPE_LITTLE 0xff |
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50 | #define RELOC_BITS0_TYPE_SH_LITTLE 0 |
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51 | |||
52 | #define RELOC_BITS1_EXTERN_LITTLE 0x01 |
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53 | |||
54 | #define RELOC_BITS1_OFFSET_LITTLE 0x7e |
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55 | #define RELOC_BITS1_OFFSET_SH_LITTLE 1 |
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56 | |||
57 | #define RELOC_BITS1_RESERVED_LITTLE 0x80 |
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58 | #define RELOC_BITS1_RESERVED_SH_LITTLE 7 |
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59 | #define RELOC_BITS2_RESERVED_LITTLE 0xff |
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60 | #define RELOC_BITS2_RESERVED_SH_LEFT_LITTLE 1 |
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61 | #define RELOC_BITS3_RESERVED_LITTLE 0x03 |
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62 | #define RELOC_BITS3_RESERVED_SH_LEFT_LITTLE 9 |
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63 | |||
64 | #define RELOC_BITS3_SIZE_LITTLE 0xfc |
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65 | #define RELOC_BITS3_SIZE_SH_LITTLE 2 |
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66 | |||
67 | /* The external format of the fixed header. */ |
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68 | |||
69 | typedef struct nlm32_alpha_external_fixed_header |
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70 | { |
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71 | |||
72 | /* The signature field identifies the file as an NLM. It must contain |
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73 | the signature string, which depends upon the NLM target. */ |
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74 | |||
75 | unsigned char signature[24]; |
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76 | |||
77 | /* The version of the header. At this time, the highest version number |
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78 | is 4. */ |
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79 | |||
80 | unsigned char version[4]; |
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81 | |||
82 | /* The name of the module, which must be a DOS name (1-8 characters followed |
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83 | by a period and a 1-3 character extension). The first byte is the byte |
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84 | length of the name and the last byte is a null terminator byte. This |
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85 | field is fixed length, and any unused bytes should be null bytes. The |
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86 | value is set by the OUTPUT keyword to NLMLINK. */ |
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87 | |||
88 | unsigned char moduleName[14]; |
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89 | |||
90 | /* Padding to make it come out correct. */ |
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91 | |||
92 | unsigned char pad1[2]; |
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93 | |||
94 | /* The byte offset of the code image from the start of the file. */ |
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95 | |||
96 | unsigned char codeImageOffset[4]; |
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97 | |||
98 | /* The size of the code image, in bytes. */ |
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99 | |||
100 | unsigned char codeImageSize[4]; |
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101 | |||
102 | /* The byte offset of the data image from the start of the file. */ |
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103 | |||
104 | unsigned char dataImageOffset[4]; |
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105 | |||
106 | /* The size of the data image, in bytes. */ |
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107 | |||
108 | unsigned char dataImageSize[4]; |
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109 | |||
110 | /* The size of the uninitialized data region that the loader is to be |
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111 | allocated at load time. Uninitialized data follows the initialized |
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112 | data in the NLM address space. */ |
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113 | |||
114 | unsigned char uninitializedDataSize[4]; |
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115 | |||
116 | /* The byte offset of the custom data from the start of the file. The |
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117 | custom data is set by the CUSTOM keyword to NLMLINK. It is possible |
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118 | for this to be EOF if there is no custom data. */ |
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119 | |||
120 | unsigned char customDataOffset[4]; |
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121 | |||
122 | /* The size of the custom data, in bytes. */ |
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123 | |||
124 | unsigned char customDataSize[4]; |
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125 | |||
126 | /* The byte offset of the module dependencies from the start of the file. |
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127 | The module dependencies are determined by the MODULE keyword in |
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128 | NLMLINK. */ |
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129 | |||
130 | unsigned char moduleDependencyOffset[4]; |
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131 | |||
132 | /* The number of module dependencies at the moduleDependencyOffset. */ |
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133 | |||
134 | unsigned char numberOfModuleDependencies[4]; |
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135 | |||
136 | /* The byte offset of the relocation fixup data from the start of the file */ |
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137 | |||
138 | unsigned char relocationFixupOffset[4]; |
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139 | |||
140 | unsigned char numberOfRelocationFixups[4]; |
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141 | |||
142 | unsigned char externalReferencesOffset[4]; |
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143 | |||
144 | unsigned char numberOfExternalReferences[4]; |
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145 | |||
146 | unsigned char publicsOffset[4]; |
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147 | |||
148 | unsigned char numberOfPublics[4]; |
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149 | |||
150 | /* The byte offset of the internal debug info from the start of the file. |
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151 | It is possible for this to be EOF if there is no debug info. */ |
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152 | |||
153 | unsigned char debugInfoOffset[4]; |
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154 | |||
155 | unsigned char numberOfDebugRecords[4]; |
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156 | |||
157 | unsigned char codeStartOffset[4]; |
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158 | |||
159 | unsigned char exitProcedureOffset[4]; |
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160 | |||
161 | unsigned char checkUnloadProcedureOffset[4]; |
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162 | |||
163 | unsigned char moduleType[4]; |
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164 | |||
165 | unsigned char flags[4]; |
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166 | |||
167 | } Nlm32_alpha_External_Fixed_Header; |