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70 lines
3.2 KiB
HTML
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<title>s390 Instruction Marker - Using as</title>
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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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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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<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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<h5 class="subsubsection">9.38.3.7 Instruction Marker</h5>
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<p><a name="index-instruction-marker_002c-s390-1903"></a><a name="index-s390-instruction-marker-1904"></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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