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68 lines
3.1 KiB
HTML
68 lines
3.1 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Entry Point - Untitled</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Untitled">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Simple-Commands.html#Simple-Commands" title="Simple Commands">
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<link rel="next" href="File-Commands.html#File-Commands" title="File Commands">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU linker LD
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(GNU Binutils)
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version 2.26.
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Copyright (C) 1991-2015 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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<meta http-equiv="Content-Style-Type" content="text/css">
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<style type="text/css"><!--
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pre.display { font-family:inherit }
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pre.format { font-family:inherit }
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pre.smalldisplay { font-family:inherit; font-size:smaller }
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pre.smallformat { font-family:inherit; font-size:smaller }
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pre.smallexample { font-size:smaller }
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pre.smalllisp { font-size:smaller }
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span.sc { font-variant:small-caps }
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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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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Entry-Point"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="File-Commands.html#File-Commands">File Commands</a>,
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Up: <a rel="up" accesskey="u" href="Simple-Commands.html#Simple-Commands">Simple Commands</a>
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<hr>
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</div>
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<h4 class="subsection">3.4.1 Setting the Entry Point</h4>
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<p><a name="index-ENTRY_0028_0040var_007bsymbol_007d_0029-372"></a><a name="index-start-of-execution-373"></a><a name="index-first-instruction-374"></a><a name="index-entry-point-375"></a>The first instruction to execute in a program is called the <dfn>entry
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point</dfn>. 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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<pre class="smallexample"> ENTRY(<var>symbol</var>)
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</pre>
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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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<ul>
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<li>the ‘<samp><span class="samp">-e</span></samp>’ <var>entry</var> command-line option;
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<li>the <code>ENTRY(</code><var>symbol</var><code>)</code> command in a linker script;
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<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>the address of the first byte of the ‘<samp><span class="samp">.text</span></samp>’ section, if present;
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<li>The address <code>0</code>.
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</ul>
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</body></html>
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