101 lines
4.2 KiB
HTML
101 lines
4.2 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU linker LD
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(Linaro_Binutils-2017.02)
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version 2.27.0.
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Copyright (C) 1991-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License". -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>LD: Entry Point</title>
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<meta name="description" content="LD: Entry Point">
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<meta name="keywords" content="LD: Entry Point">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="LD-Index.html#LD-Index" rel="index" title="LD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Simple-Commands.html#Simple-Commands" rel="up" title="Simple Commands">
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<link href="File-Commands.html#File-Commands" rel="next" title="File Commands">
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<link href="Simple-Commands.html#Simple-Commands" rel="prev" title="Simple Commands">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
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kbd {font-style:oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nocodebreak {white-space:nowrap}
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span.nolinebreak {white-space:nowrap}
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span.roman {font-family:serif; font-weight:normal}
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span.sansserif {font-family:sans-serif; font-weight:normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Entry-Point"></a>
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<div class="header">
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<p>
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Next: <a href="File-Commands.html#File-Commands" accesskey="n" rel="next">File Commands</a>, Up: <a href="Simple-Commands.html#Simple-Commands" accesskey="u" rel="up">Simple Commands</a> [<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>
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</div>
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<hr>
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<a name="Setting-the-Entry-Point"></a>
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<h4 class="subsection">3.4.1 Setting the Entry Point</h4>
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<a name="index-ENTRY_0028symbol_0029"></a>
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<a name="index-start-of-execution"></a>
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<a name="index-first-instruction"></a>
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<a name="index-entry-point"></a>
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<p>The first instruction to execute in a program is called the <em>entry
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point</em>. You can use the <code>ENTRY</code> linker script command to set the
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entry point. The argument is a symbol name:
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</p><div class="smallexample">
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<pre class="smallexample">ENTRY(<var>symbol</var>)
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</pre></div>
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<p>There are several ways to set the entry point. The linker will set the
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entry point by trying each of the following methods in order, and
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stopping when one of them succeeds:
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</p><ul>
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<li> the ‘<samp>-e</samp>’ <var>entry</var> command-line option;
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</li><li> the <code>ENTRY(<var>symbol</var>)</code> command in a linker script;
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</li><li> the value of a target specific symbol, if it is defined; For many
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targets this is <code>start</code>, but PE and BeOS based systems for example
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check a list of possible entry symbols, matching the first one found.
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</li><li> the address of the first byte of the ‘<samp>.text</samp>’ section, if present;
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</li><li> The address <code>0</code>.
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</li></ul>
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</body>
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</html>
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