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<title>Using the GNU Compiler Collection (GCC): Epiphany Function Attributes</title>
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<a name="Epiphany-Function-Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="H8_002f300-Function-Attributes.html#H8_002f300-Function-Attributes" accesskey="n" rel="next">H8/300 Function Attributes</a>, Previous: <a href="CR16-Function-Attributes.html#CR16-Function-Attributes" accesskey="p" rel="prev">CR16 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="Epiphany-Function-Attributes-1"></a>
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<h4 class="subsection">6.31.8 Epiphany Function Attributes</h4>
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<p>These function attributes are supported by the Epiphany back end:
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</p>
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<dl compact="compact">
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<dt><code>disinterrupt</code></dt>
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<dd><a name="index-disinterrupt-function-attribute_002c-Epiphany"></a>
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<p>This attribute causes the compiler to emit
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instructions to disable interrupts for the duration of the given
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function.
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</p>
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</dd>
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<dt><code>forwarder_section</code></dt>
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<dd><a name="index-forwarder_005fsection-function-attribute_002c-Epiphany"></a>
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<p>This attribute modifies the behavior of an interrupt handler.
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The interrupt handler may be in external memory which cannot be
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reached by a branch instruction, so generate a local memory trampoline
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to transfer control. The single parameter identifies the section where
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the trampoline is placed.
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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-Epiphany"></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. It may also generate
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a special section with code to initialize the interrupt vector table.
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</p>
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<p>On Epiphany targets one or more optional parameters can be added like this:
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</p>
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<div class="smallexample">
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<pre class="smallexample">void __attribute__ ((interrupt ("dma0, dma1"))) universal_dma_handler ();
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</pre></div>
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<p>Permissible values for these parameters are: <code>reset</code><!-- /@w -->,
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<code><span class="nolinebreak">software_exception</span></code><!-- /@w -->, <code><span class="nolinebreak">page_miss</span></code><!-- /@w -->,
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<code>timer0</code><!-- /@w -->, <code>timer1</code><!-- /@w -->, <code>message</code><!-- /@w -->,
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<code>dma0</code><!-- /@w -->, <code>dma1</code><!-- /@w -->, <code>wand</code><!-- /@w --> and <code>swi</code><!-- /@w -->.
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Multiple parameters indicate that multiple entries in the interrupt
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vector table should be initialized for this function, i.e. for each
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parameter <var>name</var><!-- /@w -->, a jump to the function is emitted in
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the section <span class="nolinebreak">ivt_entry_</span><var>name</var><!-- /@w -->. The parameter(s) may be omitted
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entirely, in which case no interrupt vector table entry is provided.
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</p>
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<p>Note that interrupts are enabled inside the function
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unless the <code>disinterrupt</code> attribute is also specified.
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</p>
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<p>The following examples are all valid uses of these attributes on
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Epiphany targets:
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</p><div class="smallexample">
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<pre class="smallexample">void __attribute__ ((interrupt)) universal_handler ();
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void __attribute__ ((interrupt ("dma1"))) dma1_handler ();
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void __attribute__ ((interrupt ("dma0, dma1")))
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universal_dma_handler ();
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void __attribute__ ((interrupt ("timer0"), disinterrupt))
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fast_timer_handler ();
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void __attribute__ ((interrupt ("dma0, dma1"),
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forwarder_section ("tramp")))
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external_dma_handler ();
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</pre></div>
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</dd>
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<dt><code>long_call</code></dt>
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<dt><code>short_call</code></dt>
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<dd><a name="index-long_005fcall-function-attribute_002c-Epiphany"></a>
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<a name="index-short_005fcall-function-attribute_002c-Epiphany"></a>
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<a name="index-indirect-calls_002c-Epiphany"></a>
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<p>These attributes specify how a particular function is called.
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These attributes override the
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<samp>-mlong-calls</samp> (see <a href="Adapteva-Epiphany-Options.html#Adapteva-Epiphany-Options">Adapteva Epiphany Options</a>)
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command-line switch and <code>#pragma long_calls</code> settings.
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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="H8_002f300-Function-Attributes.html#H8_002f300-Function-Attributes" accesskey="n" rel="next">H8/300 Function Attributes</a>, Previous: <a href="CR16-Function-Attributes.html#CR16-Function-Attributes" accesskey="p" rel="prev">CR16 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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