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172 lines
7.8 KiB
HTML
172 lines
7.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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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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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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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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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Blackfin Function Attributes (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="Blackfin Function Attributes (Using the GNU Compiler Collection (GCC))">
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<meta name="keywords" content="Blackfin Function Attributes (Using the GNU Compiler Collection (GCC))">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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="CR16-Function-Attributes.html#CR16-Function-Attributes" rel="next" title="CR16 Function Attributes">
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<link href="AVR-Function-Attributes.html#AVR-Function-Attributes" rel="prev" title="AVR Function Attributes">
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</style>
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</head>
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<body lang="en">
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<a name="Blackfin-Function-Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="CR16-Function-Attributes.html#CR16-Function-Attributes" accesskey="n" rel="next">CR16 Function Attributes</a>, Previous: <a href="AVR-Function-Attributes.html#AVR-Function-Attributes" accesskey="p" rel="prev">AVR 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="Blackfin-Function-Attributes-1"></a>
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<h4 class="subsection">6.31.6 Blackfin Function Attributes</h4>
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<p>These function attributes are supported by the Blackfin back end:
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</p>
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<dl compact="compact">
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<dt><code>exception_handler</code></dt>
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<dd><a name="index-exception_005fhandler-function-attribute"></a>
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<a name="index-exception-handler-functions_002c-Blackfin"></a>
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<p>Use this attribute on the Blackfin to indicate that the specified function
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is an exception handler. The compiler generates function entry and
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exit sequences suitable for use in an exception handler when this
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attribute is present.
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</p>
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</dd>
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<dt><code>interrupt_handler</code></dt>
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<dd><a name="index-interrupt_005fhandler-function-attribute_002c-Blackfin"></a>
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<p>Use this attribute to
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indicate that the specified function is an interrupt handler. The compiler
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generates function entry and exit sequences suitable for use in an
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interrupt handler when this attribute is present.
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</p>
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</dd>
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<dt><code>kspisusp</code></dt>
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<dd><a name="index-kspisusp-function-attribute_002c-Blackfin"></a>
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<a name="index-User-stack-pointer-in-interrupts-on-the-Blackfin"></a>
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<p>When used together with <code>interrupt_handler</code>, <code>exception_handler</code>
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or <code>nmi_handler</code>, code is generated to load the stack pointer
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from the USP register in the function prologue.
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</p>
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</dd>
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<dt><code>l1_text</code></dt>
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<dd><a name="index-l1_005ftext-function-attribute_002c-Blackfin"></a>
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<p>This attribute specifies a function to be placed into L1 Instruction
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SRAM. The function is put into a specific section named <code>.l1.text</code>.
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With <samp>-mfdpic</samp>, function calls with a such function as the callee
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or caller uses inlined PLT.
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</p>
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</dd>
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<dt><code>l2</code></dt>
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<dd><a name="index-l2-function-attribute_002c-Blackfin"></a>
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<p>This attribute specifies a function to be placed into L2
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SRAM. The function is put into a specific section named
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<code>.l2.text</code>. With <samp>-mfdpic</samp>, callers of such functions use
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an inlined PLT.
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</p>
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</dd>
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<dt><code>longcall</code></dt>
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<dt><code>shortcall</code></dt>
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<dd><a name="index-indirect-calls_002c-Blackfin"></a>
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<a name="index-longcall-function-attribute_002c-Blackfin"></a>
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<a name="index-shortcall-function-attribute_002c-Blackfin"></a>
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<p>The <code>longcall</code> attribute
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indicates that the function might be far away from the call site and
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require a different (more expensive) calling sequence. The
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<code>shortcall</code> attribute indicates that the function is always close
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enough for the shorter calling sequence to be used. These attributes
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override the <samp>-mlongcall</samp> switch.
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</p>
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</dd>
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<dt><code>nesting</code></dt>
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<dd><a name="index-nesting-function-attribute_002c-Blackfin"></a>
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<a name="index-Allow-nesting-in-an-interrupt-handler-on-the-Blackfin-processor"></a>
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<p>Use this attribute together with <code>interrupt_handler</code>,
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<code>exception_handler</code> or <code>nmi_handler</code> to indicate that the function
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entry code should enable nested interrupts or exceptions.
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</p>
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</dd>
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<dt><code>nmi_handler</code></dt>
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<dd><a name="index-nmi_005fhandler-function-attribute_002c-Blackfin"></a>
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<a name="index-NMI-handler-functions-on-the-Blackfin-processor"></a>
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<p>Use this attribute on the Blackfin to indicate that the specified function
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is an NMI handler. The compiler generates function entry and
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exit sequences suitable for use in an NMI handler when this
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attribute is present.
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</p>
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</dd>
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<dt><code>saveall</code></dt>
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<dd><a name="index-saveall-function-attribute_002c-Blackfin"></a>
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<a name="index-save-all-registers-on-the-Blackfin"></a>
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<p>Use this attribute to indicate that
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all registers except the stack pointer should be saved in the prologue
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regardless of whether they are used or not.
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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="CR16-Function-Attributes.html#CR16-Function-Attributes" accesskey="n" rel="next">CR16 Function Attributes</a>, Previous: <a href="AVR-Function-Attributes.html#AVR-Function-Attributes" accesskey="p" rel="prev">AVR 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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