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94 lines
3.6 KiB
HTML
94 lines
3.6 KiB
HTML
<html lang="en">
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<head>
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<title>Previous - Using as</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Pseudo-Ops.html#Pseudo-Ops" title="Pseudo Ops">
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<link rel="prev" href="PopSection.html#PopSection" title="PopSection">
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<link rel="next" href="Print.html#Print" title="Print">
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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) 1991-2015 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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<meta http-equiv="Content-Style-Type" content="text/css">
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<style type="text/css"><!--
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pre.display { font-family:inherit }
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pre.format { font-family:inherit }
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pre.smalldisplay { font-family:inherit; font-size:smaller }
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pre.smallformat { font-family:inherit; font-size:smaller }
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pre.smallexample { font-size:smaller }
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pre.smalllisp { font-size:smaller }
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span.sc { font-variant:small-caps }
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span.roman { font-family:serif; font-weight:normal; }
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span.sansserif { font-family:sans-serif; font-weight:normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Previous"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Print.html#Print">Print</a>,
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Previous: <a rel="previous" accesskey="p" href="PopSection.html#PopSection">PopSection</a>,
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Up: <a rel="up" accesskey="u" href="Pseudo-Ops.html#Pseudo-Ops">Pseudo Ops</a>
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<hr>
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</div>
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<h3 class="section">7.67 <code>.previous</code></h3>
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<p><a name="index-g_t_0040code_007bprevious_007d-directive-430"></a><a name="index-Section-Stack-431"></a>This is one of the ELF section stack manipulation directives. The others are
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<code>.section</code> (see <a href="Section.html#Section">Section</a>), <code>.subsection</code> (see <a href="SubSection.html#SubSection">SubSection</a>),
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<code>.pushsection</code> (see <a href="PushSection.html#PushSection">PushSection</a>), and <code>.popsection</code>
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(see <a href="PopSection.html#PopSection">PopSection</a>).
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<p>This directive swaps the current section (and subsection) with most recently
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referenced section/subsection pair prior to this one. Multiple
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<code>.previous</code> directives in a row will flip between two sections (and their
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subsections). For example:
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<pre class="smallexample"> .section A
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.subsection 1
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.word 0x1234
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.subsection 2
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.word 0x5678
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.previous
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.word 0x9abc
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</pre>
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<p>Will place 0x1234 and 0x9abc into subsection 1 and 0x5678 into subsection 2 of
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section A. Whilst:
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<pre class="smallexample"> .section A
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.subsection 1
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# Now in section A subsection 1
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.word 0x1234
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.section B
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.subsection 0
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# Now in section B subsection 0
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.word 0x5678
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.subsection 1
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# Now in section B subsection 1
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.word 0x9abc
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.previous
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# Now in section B subsection 0
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.word 0xdef0
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</pre>
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<p>Will place 0x1234 into section A, 0x5678 and 0xdef0 into subsection 0 of
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section B and 0x9abc into subsection 1 of section B.
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<p>In terms of the section stack, this directive swaps the current section with
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the top section on the section stack.
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</body></html>
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