include/nlm/alpha-ext.h

   1 /* Alpha NLM (NetWare Loadable Module) support for BFD.
   2    Copyright (C) 1993-2017 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 3 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,
  20    MA 02110-1301, USA.  */
  21
  22 /* An Alpha NLM starts with an instance of this structure.  */
  23
  24 struct nlm32_alpha_external_prefix_header
  25 {
  26   /* Magic number.  Must be NLM32_ALPHA_MAGIC.  */
  27   unsigned char magic[4];
  28   /* Format descriptor.  Current value is 2.  */
  29   unsigned char format[4];
  30   /* Size of prefix header.  */
  31   unsigned char size[4];
  32   /* Padding.  */
  33   unsigned char pad1[4];
  34   /* More fields may be added later, supposedly.  */
  35 };
  36
  37 /* The external format of an Alpha NLM reloc.  This is the same as an
  38    Alpha ECOFF reloc.  */
  39
  40 struct nlm32_alpha_external_reloc
  41 {
  42   unsigned char r_vaddr[8];
  43   unsigned char r_symndx[4];
  44   unsigned char r_bits[4];
  45 };
  46
  47 /* Constants to unpack the r_bits field of a reloc.  */
  48
  49 #define RELOC_BITS0_TYPE_LITTLE                 0xff
  50 #define RELOC_BITS0_TYPE_SH_LITTLE              0
  51
  52 #define RELOC_BITS1_EXTERN_LITTLE               0x01
  53
  54 #define RELOC_BITS1_OFFSET_LITTLE               0x7e
  55 #define RELOC_BITS1_OFFSET_SH_LITTLE            1
  56
  57 #define RELOC_BITS1_RESERVED_LITTLE             0x80
  58 #define RELOC_BITS1_RESERVED_SH_LITTLE          7
  59 #define RELOC_BITS2_RESERVED_LITTLE             0xff
  60 #define RELOC_BITS2_RESERVED_SH_LEFT_LITTLE     1
  61 #define RELOC_BITS3_RESERVED_LITTLE             0x03
  62 #define RELOC_BITS3_RESERVED_SH_LEFT_LITTLE     9
  63
  64 #define RELOC_BITS3_SIZE_LITTLE                 0xfc
  65 #define RELOC_BITS3_SIZE_SH_LITTLE              2
  66
  67 /* The external format of the fixed header.  */
  68
  69 typedef struct nlm32_alpha_external_fixed_header
  70 {
  71
  72   /* The signature field identifies the file as an NLM.  It must contain
  73      the signature string, which depends upon the NLM target. */
  74
  75   unsigned char signature[24];
  76
  77   /* The version of the header.  At this time, the highest version number
  78      is 4. */
  79
  80   unsigned char version[4];
  81
  82   /* The name of the module, which must be a DOS name (1-8 characters followed
  83      by a period and a 1-3 character extension).  The first byte is the byte
  84      length of the name and the last byte is a null terminator byte.  This
  85      field is fixed length, and any unused bytes should be null bytes.  The
  86      value is set by the OUTPUT keyword to NLMLINK. */
  87
  88   unsigned char moduleName[14];
  89
  90   /* Padding to make it come out correct. */
  91
  92   unsigned char pad1[2];
  93
  94   /* The byte offset of the code image from the start of the file. */
  95
  96   unsigned char codeImageOffset[4];
  97
  98   /* The size of the code image, in bytes. */
  99
 100   unsigned char codeImageSize[4];
 101
 102   /* The byte offset of the data image from the start of the file. */
 103
 104   unsigned char dataImageOffset[4];
 105
 106   /* The size of the data image, in bytes. */
 107
 108   unsigned char dataImageSize[4];
 109
 110   /* The size of the uninitialized data region that the loader is to be
 111      allocated at load time.  Uninitialized data follows the initialized
 112      data in the NLM address space. */
 113
 114   unsigned char uninitializedDataSize[4];
 115
 116   /* The byte offset of the custom data from the start of the file.  The
 117      custom data is set by the CUSTOM keyword to NLMLINK.  It is possible
 118      for this to be EOF if there is no custom data. */
 119
 120   unsigned char customDataOffset[4];
 121
 122   /* The size of the custom data, in bytes. */
 123
 124   unsigned char customDataSize[4];
 125
 126   /* The byte offset of the module dependencies from the start of the file.
 127      The module dependencies are determined by the MODULE keyword in
 128      NLMLINK. */
 129
 130   unsigned char moduleDependencyOffset[4];
 131
 132   /* The number of module dependencies at the moduleDependencyOffset. */
 133
 134   unsigned char numberOfModuleDependencies[4];
 135
 136   /* The byte offset of the relocation fixup data from the start of the file */
 137
 138   unsigned char relocationFixupOffset[4];
 139
 140   unsigned char numberOfRelocationFixups[4];
 141
 142   unsigned char externalReferencesOffset[4];
 143
 144   unsigned char numberOfExternalReferences[4];
 145
 146   unsigned char publicsOffset[4];
 147
 148   unsigned char numberOfPublics[4];
 149
 150   /* The byte offset of the internal debug info from the start of the file.
 151      It is possible for this to be EOF if there is no debug info. */
 152
 153   unsigned char debugInfoOffset[4];
 154
 155   unsigned char numberOfDebugRecords[4];
 156
 157   unsigned char codeStartOffset[4];
 158
 159   unsigned char exitProcedureOffset[4];
 160
 161   unsigned char checkUnloadProcedureOffset[4];
 162
 163   unsigned char moduleType[4];
 164
 165   unsigned char flags[4];
 166
 167 } Nlm32_alpha_External_Fixed_Header;