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  1. /* Alpha NLM (NetWare Loadable Module) support for BFD.
  2.    Copyright (C) 1993-2015 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;
  168.