124 lines
5.7 KiB
HTML
124 lines
5.7 KiB
HTML
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<title>Using the GNU Compiler Collection (GCC): MicroBlaze Function Attributes</title>
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<a name="MicroBlaze-Function-Attributes"></a>
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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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<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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