152 lines
7.2 KiB
HTML
152 lines
7.2 KiB
HTML
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<!-- Copyright (C) 1988-2016 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 or
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any later version published by the Free Software Foundation; with the
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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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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): RX Function Attributes</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): RX Function Attributes">
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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="S_002f390-Function-Attributes.html#S_002f390-Function-Attributes" rel="next" title="S/390 Function Attributes">
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<link href="RL78-Function-Attributes.html#RL78-Function-Attributes" rel="prev" title="RL78 Function Attributes">
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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="RX-Function-Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="S_002f390-Function-Attributes.html#S_002f390-Function-Attributes" accesskey="n" rel="next">S/390 Function Attributes</a>, Previous: <a href="RL78-Function-Attributes.html#RL78-Function-Attributes" accesskey="p" rel="prev">RL78 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="RX-Function-Attributes-1"></a>
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<h4 class="subsection">6.31.25 RX Function Attributes</h4>
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<p>These function attributes are supported by the RX back end:
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</p>
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<dl compact="compact">
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<dt><code>fast_interrupt</code></dt>
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<dd><a name="index-fast_005finterrupt-function-attribute_002c-RX"></a>
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<p>Use this attribute on the RX port to indicate that the specified
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function is a fast interrupt handler. This is just like the
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<code>interrupt</code> attribute, except that <code>freit</code> is used to return
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instead of <code>reit</code>.
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</p>
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</dd>
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<dt><code>interrupt</code></dt>
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<dd><a name="index-interrupt-function-attribute_002c-RX"></a>
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<p>Use this attribute to indicate
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that the specified function is an interrupt handler. The compiler generates
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function entry and exit sequences suitable for use in an interrupt handler
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when this attribute is present.
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</p>
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<p>On RX targets, you may specify one or more vector numbers as arguments
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to the attribute, as well as naming an alternate table name.
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Parameters are handled sequentially, so one handler can be assigned to
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multiple entries in multiple tables. One may also pass the magic
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string <code>"$default"</code> which causes the function to be used for any
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unfilled slots in the current table.
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</p>
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<p>This example shows a simple assignment of a function to one vector in
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the default table (note that preprocessor macros may be used for
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chip-specific symbolic vector names):
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</p><div class="smallexample">
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<pre class="smallexample">void __attribute__ ((interrupt (5))) txd1_handler ();
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</pre></div>
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<p>This example assigns a function to two slots in the default table
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(using preprocessor macros defined elsewhere) and makes it the default
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for the <code>dct</code> table:
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</p><div class="smallexample">
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<pre class="smallexample">void __attribute__ ((interrupt (RXD1_VECT,RXD2_VECT,"dct","$default")))
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txd1_handler ();
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</pre></div>
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</dd>
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<dt><code>naked</code></dt>
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<dd><a name="index-naked-function-attribute_002c-RX"></a>
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<p>This attribute allows the compiler to construct the
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requisite function declaration, while allowing the body of the
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function to be assembly code. The specified function will not have
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prologue/epilogue sequences generated by the compiler. Only basic
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<code>asm</code> statements can safely be included in naked functions
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(see <a href="Basic-Asm.html#Basic-Asm">Basic Asm</a>). While using extended <code>asm</code> or a mixture of
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basic <code>asm</code> and C code may appear to work, they cannot be
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depended upon to work reliably and are not supported.
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</p>
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</dd>
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<dt><code>vector</code></dt>
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<dd><a name="index-vector-function-attribute_002c-RX"></a>
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<p>This RX attribute is similar to the <code>interrupt</code> attribute, including its
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parameters, but does not make the function an interrupt-handler type
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function (i.e. it retains the normal C function calling ABI). See the
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<code>interrupt</code> attribute for a description of its arguments.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="S_002f390-Function-Attributes.html#S_002f390-Function-Attributes" accesskey="n" rel="next">S/390 Function Attributes</a>, Previous: <a href="RL78-Function-Attributes.html#RL78-Function-Attributes" accesskey="p" rel="prev">RL78 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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</body>
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</html>
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