include/nlm/ppc-ext.h

   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* A PowerPC NLM starts with an instance of this structure.  */
  21
  22 struct nlm32_powerpc_external_prefix_header
  23 {
  24   /* Signature.  Must be "AppleNLM".  */
  25   char signature[8];
  26   /* Version number.  Current value is 1.  */
  27   unsigned char headerVersion[4];
  28   /* ??.  Should be set to 0.  */
  29   unsigned char origins[4];
  30   /* File creation date in standard Unix time format (seconds since
  31      1/1/70).  */
  32   unsigned char date[4];
  33 };
  34
  35 #define NLM32_POWERPC_SIGNATURE "AppleNLM"
  36 #define NLM32_POWERPC_HEADER_VERSION 1
  37
  38 /* The external format of a PowerPC NLM reloc.  This is the same as an
  39    XCOFF dynamic reloc.  */
  40
  41 struct nlm32_powerpc_external_reloc
  42 {
  43   /* Address.  */
  44   unsigned char l_vaddr[4];
  45   /* Symbol table index.  This is 0 for .text and 1 for .data.  2
  46      means .bss, but I don't know if it is used.  In XCOFF, larger
  47      numbers are indices into the dynamic symbol table, but they are
  48      presumably not used in an NLM.  */
  49   unsigned char l_symndx[4];
  50   /* Relocation type.  */
  51   unsigned char l_rtype[2];
  52   /* Section number being relocated.  */
  53   unsigned char l_rsecnm[2];
  54 };
  55
  56 /* The external format of the fixed header.  */
  57
  58 typedef struct nlm32_powerpc_external_fixed_header
  59 {
  60
  61   /* The signature field identifies the file as an NLM.  It must contain
  62      the signature string, which depends upon the NLM target. */
  63
  64   unsigned char signature[24];
  65
  66   /* The version of the header.  At this time, the highest version number
  67      is 4. */
  68
  69   unsigned char version[4];
  70
  71   /* The name of the module, which must be a DOS name (1-8 characters followed
  72      by a period and a 1-3 character extension).  The first byte is the byte
  73      length of the name and the last byte is a null terminator byte.  This
  74      field is fixed length, and any unused bytes should be null bytes.  The
  75      value is set by the OUTPUT keyword to NLMLINK. */
  76
  77   unsigned char moduleName[14];
  78
  79   /* Padding to make it come out correct. */
  80
  81   unsigned char pad1[2];
  82
  83   /* The byte offset of the code image from the start of the file. */
  84
  85   unsigned char codeImageOffset[4];
  86
  87   /* The size of the code image, in bytes. */
  88
  89   unsigned char codeImageSize[4];
  90
  91   /* The byte offset of the data image from the start of the file. */
  92
  93   unsigned char dataImageOffset[4];
  94
  95   /* The size of the data image, in bytes. */
  96
  97   unsigned char dataImageSize[4];
  98
  99   /* The size of the uninitialized data region that the loader is to be
 100      allocated at load time.  Uninitialized data follows the initialized
 101      data in the NLM address space. */
 102
 103   unsigned char uninitializedDataSize[4];
 104
 105   /* The byte offset of the custom data from the start of the file.  The
 106      custom data is set by the CUSTOM keyword to NLMLINK.  It is possible
 107      for this to be EOF if there is no custom data. */
 108
 109   unsigned char customDataOffset[4];
 110
 111   /* The size of the custom data, in bytes. */
 112
 113   unsigned char customDataSize[4];
 114
 115   /* The byte offset of the module dependencies from the start of the file.
 116      The module dependencies are determined by the MODULE keyword in
 117      NLMLINK. */
 118
 119   unsigned char moduleDependencyOffset[4];
 120
 121   /* The number of module dependencies at the moduleDependencyOffset. */
 122
 123   unsigned char numberOfModuleDependencies[4];
 124
 125   /* The byte offset of the relocation fixup data from the start of the file */
 126
 127   unsigned char relocationFixupOffset[4];
 128
 129   unsigned char numberOfRelocationFixups[4];
 130
 131   unsigned char externalReferencesOffset[4];
 132
 133   unsigned char numberOfExternalReferences[4];
 134
 135   unsigned char publicsOffset[4];
 136
 137   unsigned char numberOfPublics[4];
 138
 139   /* The byte offset of the internal debug info from the start of the file.
 140      It is possible for this to be EOF if there is no debug info. */
 141
 142   unsigned char debugInfoOffset[4];
 143
 144   unsigned char numberOfDebugRecords[4];
 145
 146   unsigned char codeStartOffset[4];
 147
 148   unsigned char exitProcedureOffset[4];
 149
 150   unsigned char checkUnloadProcedureOffset[4];
 151
 152   unsigned char moduleType[4];
 153
 154   unsigned char flags[4];
 155
 156 } Nlm32_powerpc_External_Fixed_Header;