visus
/
toolchain-gcc-arm-embedded

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Copyright (C) 1988-2020 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being "Funding Free Software", the Front-Cover
Texts being (a) (see below), and with the Back-Cover Texts being (b)
(see below).  A copy of the license is included in the section entitled
"GNU Free Documentation License".

(a) The FSF's Front-Cover Text is:

A GNU Manual

(b) The FSF's Back-Cover Text is:

You have freedom to copy and modify this GNU Manual, like GNU
     software.  Copies published by the Free Software Foundation raise
     funds for GNU development. -->
<!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>RISC-V Function Attributes (Using the GNU Compiler Collection (GCC))</title>

<meta name="description" content="RISC-V Function Attributes (Using the GNU Compiler Collection (GCC))">
<meta name="keywords" content="RISC-V Function Attributes (Using the GNU Compiler Collection (GCC))">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<link href="index.html#Top" rel="start" title="Top">
<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="Function-Attributes.html#Function-Attributes" rel="up" title="Function Attributes">
<link href="RL78-Function-Attributes.html#RL78-Function-Attributes" rel="next" title="RL78 Function Attributes">
<link href="PowerPC-Function-Attributes.html#PowerPC-Function-Attributes" rel="prev" title="PowerPC Function Attributes">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smalllisp {margin-left: 3.2em}
kbd {font-style: oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nolinebreak {white-space: nowrap}
span.roman {font-family: initial; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
-->
</style>


</head>

<body lang="en">
<a name="RISC_002dV-Function-Attributes"></a>
<div class="header">
<p>
Next: <a href="RL78-Function-Attributes.html#RL78-Function-Attributes" accesskey="n" rel="next">RL78 Function Attributes</a>, Previous: <a href="PowerPC-Function-Attributes.html#PowerPC-Function-Attributes" accesskey="p" rel="prev">PowerPC Function Attributes</a>, Up: <a href="Function-Attributes.html#Function-Attributes" accesskey="u" rel="up">Function Attributes</a> &nbsp; [<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>
</div>
<hr>
<a name="RISC_002dV-Function-Attributes-1"></a>
<h4 class="subsection">6.33.27 RISC-V Function Attributes</h4>

<p>These function attributes are supported by the RISC-V back end:
</p>
<dl compact="compact">
<dt><code>naked</code></dt>
<dd><a name="index-naked-function-attribute_002c-RISC_002dV"></a>
<p>This attribute allows the compiler to construct the
requisite function declaration, while allowing the body of the
function to be assembly code. The specified function will not have
prologue/epilogue sequences generated by the compiler. Only basic
<code>asm</code> statements can safely be included in naked functions
(see <a href="Basic-Asm.html#Basic-Asm">Basic Asm</a>). While using extended <code>asm</code> or a mixture of
basic <code>asm</code> and C code may appear to work, they cannot be
depended upon to work reliably and are not supported.
</p>
</dd>
<dt><code>interrupt</code></dt>
<dd><a name="index-interrupt-function-attribute_002c-RISC_002dV"></a>
<p>Use this attribute to indicate that the specified function is an interrupt
handler.  The compiler generates function entry and exit sequences suitable
for use in an interrupt handler when this attribute is present.
</p>
<p>You can specify the kind of interrupt to be handled by adding an optional
parameter to the interrupt attribute like this:
</p>
<div class="smallexample">
<pre class="smallexample">void f (void) __attribute__ ((interrupt (&quot;user&quot;)));
</pre></div>

<p>Permissible values for this parameter are <code>user</code>, <code>supervisor</code>,
and <code>machine</code>.  If there is no parameter, then it defaults to
<code>machine</code>.
</p></dd>
</dl>


</body>
</html>