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123 lines
5.6 KiB
HTML
123 lines
5.6 KiB
HTML
4 years ago
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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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<!-- Copyright (C) 1988-2018 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 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>MicroBlaze Function Attributes (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="MicroBlaze Function Attributes (Using the GNU Compiler Collection (GCC))">
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<meta name="keywords" content="MicroBlaze Function Attributes (Using the GNU Compiler Collection (GCC))">
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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="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Function-Attributes.html#Function-Attributes" rel="up" title="Function Attributes">
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<link href="Microsoft-Windows-Function-Attributes.html#Microsoft-Windows-Function-Attributes" rel="next" title="Microsoft Windows Function Attributes">
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<link href="MeP-Function-Attributes.html#MeP-Function-Attributes" rel="prev" title="MeP Function Attributes">
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</style>
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</head>
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<body lang="en">
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<a name="MicroBlaze-Function-Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="Microsoft-Windows-Function-Attributes.html#Microsoft-Windows-Function-Attributes" accesskey="n" rel="next">Microsoft Windows Function Attributes</a>, Previous: <a href="MeP-Function-Attributes.html#MeP-Function-Attributes" accesskey="p" rel="prev">MeP Function Attributes</a>, Up: <a href="Function-Attributes.html#Function-Attributes" accesskey="u" rel="up">Function Attributes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="MicroBlaze-Function-Attributes-1"></a>
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<h4 class="subsection">6.31.16 MicroBlaze Function Attributes</h4>
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<p>These function attributes are supported on MicroBlaze targets:
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</p>
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<dl compact="compact">
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<dt><code>save_volatiles</code></dt>
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<dd><a name="index-save_005fvolatiles-function-attribute_002c-MicroBlaze"></a>
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<p>Use this attribute to indicate that the function is
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an interrupt handler. All volatile registers (in addition to non-volatile
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registers) are saved in the function prologue. If the function is a leaf
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function, only volatiles used by the function are saved. A normal function
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return is generated instead of a return from interrupt.
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</p>
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</dd>
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<dt><code>break_handler</code></dt>
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<dd><a name="index-break_005fhandler-function-attribute_002c-MicroBlaze"></a>
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<a name="index-break-handler-functions"></a>
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<p>Use this attribute to indicate that
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the specified function is a break handler. The compiler generates function
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entry and exit sequences suitable for use in an break handler when this
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attribute is present. The return from <code>break_handler</code> is done through
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the <code>rtbd</code> instead of <code>rtsd</code>.
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</p>
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<div class="smallexample">
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<pre class="smallexample">void f () __attribute__ ((break_handler));
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</pre></div>
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</dd>
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<dt><code>interrupt_handler</code></dt>
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<dt><code>fast_interrupt</code></dt>
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<dd><a name="index-interrupt_005fhandler-function-attribute_002c-MicroBlaze"></a>
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<a name="index-fast_005finterrupt-function-attribute_002c-MicroBlaze"></a>
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<p>These attributes indicate that the specified function is an interrupt
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handler. Use the <code>fast_interrupt</code> attribute to indicate handlers
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used in low-latency interrupt mode, and <code>interrupt_handler</code> for
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interrupts that do not use low-latency handlers. In both cases, GCC
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emits appropriate prologue code and generates a return from the handler
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using <code>rtid</code> instead of <code>rtsd</code>.
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</p></dd>
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</dl>
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</body>
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</html>
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