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| <h4 class="subsection">3.4.1 Setting the Entry Point</h4> |
| |
| <p><a name="index-ENTRY_0028_0040var_007bsymbol_007d_0029-342"></a><a name="index-start-of-execution-343"></a><a name="index-first-instruction-344"></a><a name="index-entry-point-345"></a>The first instruction to execute in a program is called the <dfn>entry |
| point</dfn>. You can use the <code>ENTRY</code> linker script command to set the |
| entry point. The argument is a symbol name: |
| <pre class="smallexample"> ENTRY(<var>symbol</var>) |
| </pre> |
| <p>There are several ways to set the entry point. The linker will set the |
| entry point by trying each of the following methods in order, and |
| stopping when one of them succeeds: |
| <ul> |
| <li>the ‘<samp><span class="samp">-e</span></samp>’ <var>entry</var> command-line option; |
| <li>the <code>ENTRY(</code><var>symbol</var><code>)</code> command in a linker script; |
| <li>the value of a target specific symbol, if it is defined; For many |
| targets this is <code>start</code>, but PE and BeOS based systems for example |
| check a list of possible entry symbols, matching the first one found. |
| <li>the address of the first byte of the ‘<samp><span class="samp">.text</span></samp>’ section, if present; |
| <li>The address <code>0</code>. |
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