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133 lines
4.8 KiB
HTML
133 lines
4.8 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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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 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
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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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>AVR Pseudo Instructions (Using as)</title>
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<meta name="description" content="AVR Pseudo Instructions (Using as)">
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<meta name="keywords" content="AVR Pseudo Instructions (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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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="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="AVR_002dDependent.html#AVR_002dDependent" rel="up" title="AVR-Dependent">
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<link href="Blackfin_002dDependent.html#Blackfin_002dDependent" rel="next" title="Blackfin-Dependent">
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<link href="AVR-Opcodes.html#AVR-Opcodes" rel="prev" title="AVR Opcodes">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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pre.format {font-family: inherit}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="AVR-Pseudo-Instructions"></a>
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<div class="header">
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<p>
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Previous: <a href="AVR-Opcodes.html#AVR-Opcodes" accesskey="p" rel="prev">AVR Opcodes</a>, Up: <a href="AVR_002dDependent.html#AVR_002dDependent" accesskey="u" rel="up">AVR-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Pseudo-Instructions"></a>
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<h4 class="subsection">9.5.4 Pseudo Instructions</h4>
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<p>The only available pseudo-instruction <code>__gcc_isr</code> can be activated by
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option <samp>-mgcc-isr</samp>.
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</p>
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<dl compact="compact">
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<dt><code>__gcc_isr 1</code></dt>
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<dd><p>Emit code chunk to be used in avr-gcc ISR prologue.
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It will expand to at most six 1-word instructions, all optional:
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push of <code>tmp_reg</code>, push of <code>SREG</code>,
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push and clear of <code>zero_reg</code>, push of <var>Reg</var>.
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</p>
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</dd>
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<dt><code>__gcc_isr 2</code></dt>
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<dd><p>Emit code chunk to be used in an avr-gcc ISR epilogue.
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It will expand to at most five 1-word instructions, all optional:
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pop of <var>Reg</var>, pop of <code>zero_reg</code>,
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pop of <code>SREG</code>, pop of <code>tmp_reg</code>.
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</p>
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</dd>
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<dt><code>__gcc_isr 0, <var>Reg</var></code></dt>
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<dd><p>Finish avr-gcc ISR function. Scan code since the last prologue
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for usage of: <code>SREG</code>, <code>tmp_reg</code>, <code>zero_reg</code>.
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Prologue chunk and epilogue chunks will be replaced by appropriate code
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to save / restore <code>SREG</code>, <code>tmp_reg</code>, <code>zero_reg</code> and <var>Reg</var>.
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</p>
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</dd>
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</dl>
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<p>Example input:
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</p>
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<div class="example">
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<pre class="example">__vector1:
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__gcc_isr 1
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lds r24, var
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inc r24
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sts var, r24
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__gcc_isr 2
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reti
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__gcc_isr 0, r24
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</pre></div>
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<p>Example output:
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</p>
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<div class="example">
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<pre class="example">00000000 <__vector1>:
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0: 8f 93 push r24
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2: 8f b7 in r24, 0x3f
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4: 8f 93 push r24
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6: 80 91 60 00 lds r24, 0x0060 ; 0x800060 <var>
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a: 83 95 inc r24
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c: 80 93 60 00 sts 0x0060, r24 ; 0x800060 <var>
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10: 8f 91 pop r24
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12: 8f bf out 0x3f, r24
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14: 8f 91 pop r24
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16: 18 95 reti
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</pre></div>
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</body>
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</html>
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