1 /* PowerPC NLM (NetWare Loadable Module) support for BFD.
2    Copyright (C) 1994 Free Software Foundation, Inc.
3 
4 This file is part of BFD, the Binary File Descriptor library.
5 
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10 
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 GNU General Public License for more details.
15 
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, 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 
27 struct 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 
46 struct 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 
65 typedef 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