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119 lines
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119 lines
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<title>M32R/D Function Attributes (Using the GNU Compiler Collection (GCC))</title>
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<link href="Function-Attributes.html#Function-Attributes" rel="up" title="Function Attributes">
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<a name="M32R_002fD-Function-Attributes"></a>
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<p>
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Next: <a href="m68k-Function-Attributes.html#m68k-Function-Attributes" accesskey="n" rel="next">m68k Function Attributes</a>, Previous: <a href="M32C-Function-Attributes.html#M32C-Function-Attributes" accesskey="p" rel="prev">M32C 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="M32R_002fD-Function-Attributes-1"></a>
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<h4 class="subsection">6.31.12 M32R/D Function Attributes</h4>
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<p>These function attributes are supported by the M32R/D back end:
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</p>
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<dl compact="compact">
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<dt><code>interrupt</code></dt>
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<dd><a name="index-interrupt-function-attribute_002c-M32R_002fD"></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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</dd>
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<dt><code>model (<var>model-name</var>)</code></dt>
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<dd><a name="index-model-function-attribute_002c-M32R_002fD"></a>
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<a name="index-function-addressability-on-the-M32R_002fD"></a>
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<p>On the M32R/D, use this attribute to set the addressability of an
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object, and of the code generated for a function. The identifier
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<var>model-name</var> is one of <code>small</code>, <code>medium</code>, or
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<code>large</code>, representing each of the code models.
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</p>
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<p>Small model objects live in the lower 16MB of memory (so that their
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addresses can be loaded with the <code>ld24</code> instruction), and are
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callable with the <code>bl</code> instruction.
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</p>
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<p>Medium model objects may live anywhere in the 32-bit address space (the
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compiler generates <code>seth/add3</code> instructions to load their addresses),
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and are callable with the <code>bl</code> instruction.
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</p>
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<p>Large model objects may live anywhere in the 32-bit address space (the
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compiler generates <code>seth/add3</code> instructions to load their addresses),
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and may not be reachable with the <code>bl</code> instruction (the compiler
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generates the much slower <code>seth/add3/jl</code> instruction sequence).
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</p></dd>
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</dl>
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</body>
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