154 lines
6.9 KiB
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154 lines
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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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(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): M32C Function Attributes</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): M32C Function Attributes">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): M32C Function Attributes">
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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="M32R_002fD-Function-Attributes.html#M32R_002fD-Function-Attributes" rel="next" title="M32R/D Function Attributes">
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<link href="IA_002d64-Function-Attributes.html#IA_002d64-Function-Attributes" rel="prev" title="IA-64 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="M32C-Function-Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="M32R_002fD-Function-Attributes.html#M32R_002fD-Function-Attributes" accesskey="n" rel="next">M32R/D Function Attributes</a>, Previous: <a href="IA_002d64-Function-Attributes.html#IA_002d64-Function-Attributes" accesskey="p" rel="prev">IA-64 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="M32C-Function-Attributes-1"></a>
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<h4 class="subsection">6.31.11 M32C Function Attributes</h4>
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<p>These function attributes are supported by the M32C back end:
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</p>
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<dl compact="compact">
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<dt><code>bank_switch</code></dt>
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<dd><a name="index-bank_005fswitch-function-attribute_002c-M32C"></a>
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<p>When added to an interrupt handler with the M32C port, causes the
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prologue and epilogue to use bank switching to preserve the registers
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rather than saving them on the stack.
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</p>
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</dd>
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<dt><code>fast_interrupt</code></dt>
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<dd><a name="index-fast_005finterrupt-function-attribute_002c-M32C"></a>
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<p>Use this attribute on the M32C 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>function_vector</code></dt>
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<dd><a name="index-function_005fvector-function-attribute_002c-M16C_002fM32C"></a>
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<p>On M16C/M32C targets, the <code>function_vector</code> attribute declares a
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special page subroutine call function. Use of this attribute reduces
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the code size by 2 bytes for each call generated to the
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subroutine. The argument to the attribute is the vector number entry
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from the special page vector table which contains the 16 low-order
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bits of the subroutine’s entry address. Each vector table has special
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page number (18 to 255) that is used in <code>jsrs</code> instructions.
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Jump addresses of the routines are generated by adding 0x0F0000 (in
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case of M16C targets) or 0xFF0000 (in case of M32C targets), to the
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2-byte addresses set in the vector table. Therefore you need to ensure
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that all the special page vector routines should get mapped within the
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address range 0x0F0000 to 0x0FFFFF (for M16C) and 0xFF0000 to 0xFFFFFF
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(for M32C).
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</p>
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<p>In the following example 2 bytes are saved for each call to
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function <code>foo</code>.
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</p>
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<div class="smallexample">
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<pre class="smallexample">void foo (void) __attribute__((function_vector(0x18)));
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void foo (void)
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{
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}
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void bar (void)
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{
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foo();
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}
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</pre></div>
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<p>If functions are defined in one file and are called in another file,
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then be sure to write this declaration in both files.
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</p>
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<p>This attribute is ignored for R8C target.
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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-M32C"></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></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="M32R_002fD-Function-Attributes.html#M32R_002fD-Function-Attributes" accesskey="n" rel="next">M32R/D Function Attributes</a>, Previous: <a href="IA_002d64-Function-Attributes.html#IA_002d64-Function-Attributes" accesskey="p" rel="prev">IA-64 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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