include/nlm/alpha-ext.h

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