70 lines
3.2 KiB
HTML
70 lines
3.2 KiB
HTML
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<html lang="en">
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<head>
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<title>s390 Instruction Marker - Using as</title>
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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="s390-Syntax.html#s390-Syntax" title="s390 Syntax">
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<link rel="prev" href="s390-Operand-Modifier.html#s390-Operand-Modifier" title="s390 Operand Modifier">
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<link rel="next" href="s390-Literal-Pool-Entries.html#s390-Literal-Pool-Entries" title="s390 Literal Pool Entries">
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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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--></style>
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</head>
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<body>
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<div class="node">
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<a name="s390-Instruction-Marker"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="s390-Literal-Pool-Entries.html#s390-Literal-Pool-Entries">s390 Literal Pool Entries</a>,
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Previous: <a rel="previous" accesskey="p" href="s390-Operand-Modifier.html#s390-Operand-Modifier">s390 Operand Modifier</a>,
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Up: <a rel="up" accesskey="u" href="s390-Syntax.html#s390-Syntax">s390 Syntax</a>
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<hr>
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</div>
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<h5 class="subsubsection">9.41.3.7 Instruction Marker</h5>
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<p><a name="index-instruction-marker_002c-s390-2080"></a><a name="index-s390-instruction-marker-2081"></a>
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The thread local storage instruction markers are used by the linker to
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perform code optimization.
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<dl>
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<dt><code>:tls_load</code><dd>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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<br><dt><code>:tls_gdcall</code><dd>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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<br><dt><code>:tls_ldcall</code><dd>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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</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><span class="samp">ELF Handling For Thread-Local Storage</span></samp>’.
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</body></html>
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