1/* PowerPC NLM (NetWare Loadable Module) support for BFD.
2   Copyright (C) 1994 Free Software Foundation, Inc.
3
4This file is part of BFD, the Binary File Descriptor library.
5
6This program is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2 of the License, or
9(at your option) any later version.
10
11This program is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with this program; if not, write to the Free Software
18Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
19
20#ifdef OLDFORMAT
21
22/* The format of a PowerPC NLM changed.  These structures are only
23   used in the old format.  */
24
25/* A PowerPC NLM starts with an instance of this structure.  */
26
27struct nlm32_powerpc_external_prefix_header
28{
29  /* Signature.  Must be "AppleNLM".  */
30  char signature[8];
31  /* Version number.  Current value is 1.  */
32  unsigned char headerVersion[4];
33  /* ??.  Should be set to 0.  */
34  unsigned char origins[4];
35  /* File creation date in standard Unix time format (seconds since
36     1/1/70).  */
37  unsigned char date[4];
38};
39
40#define NLM32_POWERPC_SIGNATURE "AppleNLM"
41#define NLM32_POWERPC_HEADER_VERSION 1
42
43/* The external format of a PowerPC NLM reloc.  This is the same as an
44   XCOFF dynamic reloc.  */
45
46struct nlm32_powerpc_external_reloc
47{
48  /* Address.  */
49  unsigned char l_vaddr[4];
50  /* Symbol table index.  This is 0 for .text and 1 for .data.  2
51     means .bss, but I don't know if it is used.  In XCOFF, larger
52     numbers are indices into the dynamic symbol table, but they are
53     presumably not used in an NLM.  */
54  unsigned char l_symndx[4];
55  /* Relocation type.  */
56  unsigned char l_rtype[2];
57  /* Section number being relocated.  */
58  unsigned char l_rsecnm[2];
59};
60
61#endif /* OLDFORMAT */
62
63/* The external format of the fixed header.  */
64
65typedef struct nlm32_powerpc_external_fixed_header
66{
67
68  /* The signature field identifies the file as an NLM.  It must contain
69     the signature string, which depends upon the NLM target. */
70
71  unsigned char signature[24];
72
73  /* The version of the header.  At this time, the highest version number
74     is 4. */
75
76  unsigned char version[4];
77
78  /* The name of the module, which must be a DOS name (1-8 characters followed
79     by a period and a 1-3 character extension).  The first byte is the byte
80     length of the name and the last byte is a null terminator byte.  This
81     field is fixed length, and any unused bytes should be null bytes.  The
82     value is set by the OUTPUT keyword to NLMLINK. */
83
84  unsigned char moduleName[14];
85
86  /* Padding to make it come out correct. */
87
88  unsigned char pad1[2];
89
90  /* The byte offset of the code image from the start of the file. */
91
92  unsigned char codeImageOffset[4];
93
94  /* The size of the code image, in bytes. */
95
96  unsigned char codeImageSize[4];
97
98  /* The byte offset of the data image from the start of the file. */
99
100  unsigned char dataImageOffset[4];
101
102  /* The size of the data image, in bytes. */
103
104  unsigned char dataImageSize[4];
105
106  /* The size of the uninitialized data region that the loader is to be
107     allocated at load time.  Uninitialized data follows the initialized
108     data in the NLM address space. */
109
110  unsigned char uninitializedDataSize[4];
111
112  /* The byte offset of the custom data from the start of the file.  The
113     custom data is set by the CUSTOM keyword to NLMLINK.  It is possible
114     for this to be EOF if there is no custom data. */
115
116  unsigned char customDataOffset[4];
117
118  /* The size of the custom data, in bytes. */
119
120  unsigned char customDataSize[4];
121
122  /* The byte offset of the module dependencies from the start of the file.
123     The module dependencies are determined by the MODULE keyword in
124     NLMLINK. */
125
126  unsigned char moduleDependencyOffset[4];
127
128  /* The number of module dependencies at the moduleDependencyOffset. */
129
130  unsigned char numberOfModuleDependencies[4];
131
132  /* The byte offset of the relocation fixup data from the start of the file */
133
134  unsigned char relocationFixupOffset[4];
135
136  unsigned char numberOfRelocationFixups[4];
137
138  unsigned char externalReferencesOffset[4];
139
140  unsigned char numberOfExternalReferences[4];
141
142  unsigned char publicsOffset[4];
143
144  unsigned char numberOfPublics[4];
145
146  /* The byte offset of the internal debug info from the start of the file.
147     It is possible for this to be EOF if there is no debug info. */
148
149  unsigned char debugInfoOffset[4];
150
151  unsigned char numberOfDebugRecords[4];
152
153  unsigned char codeStartOffset[4];
154
155  unsigned char exitProcedureOffset[4];
156
157  unsigned char checkUnloadProcedureOffset[4];
158
159  unsigned char moduleType[4];
160
161  unsigned char flags[4];
162
163} Nlm32_powerpc_External_Fixed_Header;
164