100 lines
3.9 KiB
HTML
100 lines
3.9 KiB
HTML
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<html lang="en">
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<head>
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<title>AVR Pseudo Instructions - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="AVR_002dDependent.html#AVR_002dDependent" title="AVR-Dependent">
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<link rel="prev" href="AVR-Opcodes.html#AVR-Opcodes" title="AVR Opcodes">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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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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<body>
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<div class="node">
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<a name="AVR-Pseudo-Instructions"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="AVR-Opcodes.html#AVR-Opcodes">AVR Opcodes</a>,
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Up: <a rel="up" accesskey="u" href="AVR_002dDependent.html#AVR_002dDependent">AVR-Dependent</a>
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<hr>
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</div>
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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><span class="option">-mgcc-isr</span></samp>.
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<dl>
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<dt><code>__gcc_isr 1</code><dd>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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<br><dt><code>__gcc_isr 2</code><dd>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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<br><dt><code>__gcc_isr 0, </code><var>Reg</var><dd>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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</dl>
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<p>Example input:
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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>
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<p>Example output:
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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>
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<!-- Copyright (C) 2005-2019 Free Software Foundation, Inc. -->
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<!-- This is part of the GAS manual. -->
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<!-- For copying conditions, see the file as.texinfo. -->
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<!-- man end -->
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</body></html>
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