120 lines
5.4 KiB
HTML
120 lines
5.4 KiB
HTML
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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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(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): M32R/D Function Attributes</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): M32R/D Function Attributes">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): M32R/D 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="m68k-Function-Attributes.html#m68k-Function-Attributes" rel="next" title="m68k Function Attributes">
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<link href="M32C-Function-Attributes.html#M32C-Function-Attributes" rel="prev" title="M32C Function Attributes">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="M32R_002fD-Function-Attributes"></a>
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<div class="header">
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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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</div>
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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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</html>
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