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252b5132 | 1 | /* Alpha NLM (NetWare Loadable Module) support for BFD. |
4f1d9bd8 | 2 | Copyright 1993 Free Software Foundation, Inc. |
252b5132 RH |
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 | |
e172dbf8 | 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
252b5132 RH |
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; |