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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- This file documents the GNU linker LD

  4. (GNU Arm Embedded Toolchain 10-2020-q4-major)

  5. version 2.35.1.

  6. 

  7. Copyright (C) 1991-2020 Free Software Foundation, Inc.

  8. 

  9. Permission is granted to copy, distribute and/or modify this document

  10. under the terms of the GNU Free Documentation License, Version 1.3

  11. or any later version published by the Free Software Foundation;

  12. with no Invariant Sections, with no Front-Cover Texts, and with no

  13. Back-Cover Texts.  A copy of the license is included in the

  14. section entitled "GNU Free Documentation License". -->

  15. <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->

  16. <head>

  17. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  18. <title>BFD outline (LD)</title>

  19. 

  20. <meta name="description" content="BFD outline (LD)">

  21. <meta name="keywords" content="BFD outline (LD)">

  22. <meta name="resource-type" content="document">

  23. <meta name="distribution" content="global">

  24. <meta name="Generator" content="makeinfo">

  25. <link href="index.html#Top" rel="start" title="Top">

  26. <link href="LD-Index.html#LD-Index" rel="index" title="LD Index">

  27. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  28. <link href="BFD.html#BFD" rel="up" title="BFD">

  29. <link href="BFD-information-loss.html#BFD-information-loss" rel="next" title="BFD information loss">

  30. <link href="BFD.html#BFD" rel="prev" title="BFD">

  31. <style type="text/css">

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  57. </style>

  58. 

  59. 

  60. </head>

  61. 

  62. <body lang="en">

  63. <a name="BFD-outline"></a>

  64. <div class="header">

  65. <p>

  66. Up: <a href="BFD.html#BFD" accesskey="u" rel="up">BFD</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p>

  67. </div>

  68. <hr>

  69. <a name="How-It-Works_003a-An-Outline-of-BFD"></a>

  70. <h3 class="section">5.1 How It Works: An Outline of BFD</h3>

  71. <a name="index-opening-object-files"></a>

  72. 

  73. <p>When an object file is opened, BFD subroutines automatically determine

  74. the format of the input object file.  They then build a descriptor in

  75. memory with pointers to routines that will be used to access elements of

  76. the object file&rsquo;s data structures.

  77. </p>

  78. <p>As different information from the object files is required,

  79. BFD reads from different sections of the file and processes them.

  80. For example, a very common operation for the linker is processing symbol

  81. tables.  Each BFD back end provides a routine for converting

  82. between the object file&rsquo;s representation of symbols and an internal

  83. canonical format. When the linker asks for the symbol table of an object

  84. file, it calls through a memory pointer to the routine from the

  85. relevant BFD back end which reads and converts the table into a canonical

  86. form.  The linker then operates upon the canonical form. When the link is

  87. finished and the linker writes the output file&rsquo;s symbol table,

  88. another BFD back end routine is called to take the newly

  89. created symbol table and convert it into the chosen output format.

  90. </p>

  91. <table class="menu" border="0" cellspacing="0">

  92. <tr><td align="left" valign="top">&bull; <a href="BFD-information-loss.html#BFD-information-loss" accesskey="1">BFD information loss</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Information Loss

  93. </td></tr>

  94. <tr><td align="left" valign="top">&bull; <a href="Canonical-format.html#Canonical-format" accesskey="2">Canonical format</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">The BFD	canonical object-file format 

  95. </td></tr>

  96. </table>

  97. 

  98. 

  99. 

  100. 

  101. </body>

  102. </html>