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252b5132 | 1 | /* Alpha NLM (NetWare Loadable Module) support for BFD. |
2571583a | 2 | Copyright (C) 1993-2017 Free Software Foundation, Inc. |
252b5132 RH |
3 | By Ian Lance Taylor, Cygnus Support |
4 | ||
e4e42b45 | 5 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 6 | |
e4e42b45 NC |
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. | |
252b5132 | 11 | |
e4e42b45 NC |
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. | |
252b5132 | 16 | |
e4e42b45 NC |
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. */ | |
252b5132 RH |
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; |