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101 lines
4.2 KiB
HTML
101 lines
4.2 KiB
HTML
<!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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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>s390 Instruction Marker (Using as)</title>
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<meta name="description" content="s390 Instruction Marker (Using as)">
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<meta name="keywords" content="s390 Instruction Marker (Using as)">
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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="s390-Syntax.html#s390-Syntax" rel="up" title="s390 Syntax">
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<link href="s390-Literal-Pool-Entries.html#s390-Literal-Pool-Entries" rel="next" title="s390 Literal Pool Entries">
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<link href="s390-Operand-Modifier.html#s390-Operand-Modifier" rel="prev" title="s390 Operand Modifier">
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</head>
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<body lang="en">
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<a name="s390-Instruction-Marker"></a>
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<div class="header">
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<p>
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Next: <a href="s390-Literal-Pool-Entries.html#s390-Literal-Pool-Entries" accesskey="n" rel="next">s390 Literal Pool Entries</a>, Previous: <a href="s390-Operand-Modifier.html#s390-Operand-Modifier" accesskey="p" rel="prev">s390 Operand Modifier</a>, Up: <a href="s390-Syntax.html#s390-Syntax" accesskey="u" rel="up">s390 Syntax</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="Instruction-Marker"></a>
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<h4 class="subsubsection">9.40.3.7 Instruction Marker</h4>
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<a name="index-instruction-marker_002c-s390"></a>
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<a name="index-s390-instruction-marker"></a>
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<p>The thread local storage instruction markers are used by the linker to
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perform code optimization.
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</p>
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<dl compact="compact">
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<dt><code>:tls_load</code></dt>
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<dd><p>The :tls_load marker is used to flag the load instruction in the initial
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exec TLS model that retrieves the offset from the thread pointer to a
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thread local storage variable from the GOT.
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</p></dd>
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<dt><code>:tls_gdcall</code></dt>
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<dd><p>The :tls_gdcall marker is used to flag the branch-and-save instruction to
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the __tls_get_offset function in the global dynamic TLS model.
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</p></dd>
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<dt><code>:tls_ldcall</code></dt>
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<dd><p>The :tls_ldcall marker is used to flag the branch-and-save instruction to
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the __tls_get_offset function in the local dynamic TLS model.
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</p></dd>
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</dl>
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<p>For more information about the thread local storage instruction marker
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and the linker optimizations see the ELF extension documentation
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‘<samp>ELF Handling For Thread-Local Storage</samp>’.
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</p>
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</body>
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</html>
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