1<html lang="en"> 2<head> 3<title>Expressions - Untitled</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Untitled"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Scripts.html#Scripts" title="Scripts"> 9<link rel="prev" href="VERSION.html#VERSION" title="VERSION"> 10<link rel="next" href="Implicit-Linker-Scripts.html#Implicit-Linker-Scripts" title="Implicit Linker Scripts"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<!-- 13This file documents the GNU linker LD 14(Sourcery CodeBench Lite 2011.09-69) 15version 2.21.53. 16 17Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 182001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. 19 20Permission is granted to copy, distribute and/or modify this document 21under the terms of the GNU Free Documentation License, Version 1.3 22or any later version published by the Free Software Foundation; 23with no Invariant Sections, with no Front-Cover Texts, and with no 24Back-Cover Texts. A copy of the license is included in the 25section entitled ``GNU Free Documentation License''.--> 26<meta http-equiv="Content-Style-Type" content="text/css"> 27<style type="text/css"><!-- 28 pre.display { font-family:inherit } 29 pre.format { font-family:inherit } 30 pre.smalldisplay { font-family:inherit; font-size:smaller } 31 pre.smallformat { font-family:inherit; font-size:smaller } 32 pre.smallexample { font-size:smaller } 33 pre.smalllisp { font-size:smaller } 34 span.sc { font-variant:small-caps } 35 span.roman { font-family:serif; font-weight:normal; } 36 span.sansserif { font-family:sans-serif; font-weight:normal; } 37--></style> 38<link rel="stylesheet" type="text/css" href="../cs.css"> 39</head> 40<body> 41<div class="node"> 42<a name="Expressions"></a> 43<p> 44Next: <a rel="next" accesskey="n" href="Implicit-Linker-Scripts.html#Implicit-Linker-Scripts">Implicit Linker Scripts</a>, 45Previous: <a rel="previous" accesskey="p" href="VERSION.html#VERSION">VERSION</a>, 46Up: <a rel="up" accesskey="u" href="Scripts.html#Scripts">Scripts</a> 47<hr> 48</div> 49 50<h3 class="section">3.10 Expressions in Linker Scripts</h3> 51 52<p><a name="index-expressions-497"></a><a name="index-arithmetic-498"></a>The syntax for expressions in the linker script language is identical to 53that of C expressions. All expressions are evaluated as integers. All 54expressions are evaluated in the same size, which is 32 bits if both the 55host and target are 32 bits, and is otherwise 64 bits. 56 57 <p>You can use and set symbol values in expressions. 58 59 <p>The linker defines several special purpose builtin functions for use in 60expressions. 61 62<ul class="menu"> 63<li><a accesskey="1" href="Constants.html#Constants">Constants</a>: Constants 64<li><a accesskey="2" href="Symbolic-Constants.html#Symbolic-Constants">Symbolic Constants</a>: Symbolic constants 65<li><a accesskey="3" href="Symbols.html#Symbols">Symbols</a>: Symbol Names 66<li><a accesskey="4" href="Orphan-Sections.html#Orphan-Sections">Orphan Sections</a>: Orphan Sections 67<li><a accesskey="5" href="Location-Counter.html#Location-Counter">Location Counter</a>: The Location Counter 68<li><a accesskey="6" href="Operators.html#Operators">Operators</a>: Operators 69<li><a accesskey="7" href="Evaluation.html#Evaluation">Evaluation</a>: Evaluation 70<li><a accesskey="8" href="Expression-Section.html#Expression-Section">Expression Section</a>: The Section of an Expression 71<li><a accesskey="9" href="Builtin-Functions.html#Builtin-Functions">Builtin Functions</a>: Builtin Functions 72</ul> 73 74 </body></html> 75 76