<html lang="en"> <head> <title>Previous - Using as</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="Using as"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Pseudo-Ops.html#Pseudo-Ops" title="Pseudo Ops"> <link rel="prev" href="PopSection.html#PopSection" title="PopSection"> <link rel="next" href="Print.html#Print" title="Print"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- This file documents the GNU Assembler "as". Copyright (C) 1991-2015 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 no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License''. --> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Previous"></a> <p> Next: <a rel="next" accesskey="n" href="Print.html#Print">Print</a>, Previous: <a rel="previous" accesskey="p" href="PopSection.html#PopSection">PopSection</a>, Up: <a rel="up" accesskey="u" href="Pseudo-Ops.html#Pseudo-Ops">Pseudo Ops</a> <hr> </div> <h3 class="section">7.67 <code>.previous</code></h3> <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 <code>.section</code> (see <a href="Section.html#Section">Section</a>), <code>.subsection</code> (see <a href="SubSection.html#SubSection">SubSection</a>), <code>.pushsection</code> (see <a href="PushSection.html#PushSection">PushSection</a>), and <code>.popsection</code> (see <a href="PopSection.html#PopSection">PopSection</a>). <p>This directive swaps the current section (and subsection) with most recently referenced section/subsection pair prior to this one. Multiple <code>.previous</code> directives in a row will flip between two sections (and their subsections). For example: <pre class="smallexample"> .section A .subsection 1 .word 0x1234 .subsection 2 .word 0x5678 .previous .word 0x9abc </pre> <p>Will place 0x1234 and 0x9abc into subsection 1 and 0x5678 into subsection 2 of section A. Whilst: <pre class="smallexample"> .section A .subsection 1 # Now in section A subsection 1 .word 0x1234 .section B .subsection 0 # Now in section B subsection 0 .word 0x5678 .subsection 1 # Now in section B subsection 1 .word 0x9abc .previous # Now in section B subsection 0 .word 0xdef0 </pre> <p>Will place 0x1234 into section A, 0x5678 and 0xdef0 into subsection 0 of section B and 0x9abc into subsection 1 of section B. <p>In terms of the section stack, this directive swaps the current section with the top section on the section stack. </body></html>