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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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  3. <!-- This file documents the GNU linker LD
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  16. <title>Expressions (LD)</title>
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  23. <link href="LD-Index.html#LD-Index" rel="index" title="LD Index">
  24. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
  25. <link href="Scripts.html#Scripts" rel="up" title="Scripts">
  26. <link href="Constants.html#Constants" rel="next" title="Constants">
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  57. <a name="Expressions"></a>
  58. <div class="header">
  59. <p>
  60. Next: <a href="Implicit-Linker-Scripts.html#Implicit-Linker-Scripts" accesskey="n" rel="next">Implicit Linker Scripts</a>, Previous: <a href="VERSION.html#VERSION" accesskey="p" rel="prev">VERSION</a>, Up: <a href="Scripts.html#Scripts" accesskey="u" rel="up">Scripts</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>
  61. </div>
  62. <hr>
  63. <a name="Expressions-in-Linker-Scripts"></a>
  64. <h3 class="section">3.10 Expressions in Linker Scripts</h3>
  65. <a name="index-expressions"></a>
  66. <a name="index-arithmetic"></a>
  67. <p>The syntax for expressions in the linker script language is identical to
  68. that of C expressions. All expressions are evaluated as integers. All
  69. expressions are evaluated in the same size, which is 32 bits if both the
  70. host and target are 32 bits, and is otherwise 64 bits.
  71. </p>
  72. <p>You can use and set symbol values in expressions.
  73. </p>
  74. <p>The linker defines several special purpose builtin functions for use in
  75. expressions.
  76. </p>
  77. <table class="menu" border="0" cellspacing="0">
  78. <tr><td align="left" valign="top">&bull; <a href="Constants.html#Constants" accesskey="1">Constants</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Constants
  79. </td></tr>
  80. <tr><td align="left" valign="top">&bull; <a href="Symbolic-Constants.html#Symbolic-Constants" accesskey="2">Symbolic Constants</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Symbolic constants
  81. </td></tr>
  82. <tr><td align="left" valign="top">&bull; <a href="Symbols.html#Symbols" accesskey="3">Symbols</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Symbol Names
  83. </td></tr>
  84. <tr><td align="left" valign="top">&bull; <a href="Orphan-Sections.html#Orphan-Sections" accesskey="4">Orphan Sections</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Orphan Sections
  85. </td></tr>
  86. <tr><td align="left" valign="top">&bull; <a href="Location-Counter.html#Location-Counter" accesskey="5">Location Counter</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">The Location Counter
  87. </td></tr>
  88. <tr><td align="left" valign="top">&bull; <a href="Operators.html#Operators" accesskey="6">Operators</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Operators
  89. </td></tr>
  90. <tr><td align="left" valign="top">&bull; <a href="Evaluation.html#Evaluation" accesskey="7">Evaluation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Evaluation
  91. </td></tr>
  92. <tr><td align="left" valign="top">&bull; <a href="Expression-Section.html#Expression-Section" accesskey="8">Expression Section</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">The Section of an Expression
  93. </td></tr>
  94. <tr><td align="left" valign="top">&bull; <a href="Builtin-Functions.html#Builtin-Functions" accesskey="9">Builtin Functions</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Builtin Functions
  95. </td></tr>
  96. </table>
  97. </body>
  98. </html>