| <html lang="en"> |
| <head> |
| <title>s390 Instruction Marker - 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="s390-Syntax.html#s390-Syntax" title="s390 Syntax"> |
| <link rel="prev" href="s390-Operand-Modifier.html#s390-Operand-Modifier" title="s390 Operand Modifier"> |
| <link rel="next" href="s390-Literal-Pool-Entries.html#s390-Literal-Pool-Entries" title="s390 Literal Pool Entries"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| This file documents the GNU Assembler "as". |
| |
| Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 2000, 2001, 2002, 2006, 2007, 2008, 2009, 2010 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> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="s390-Instruction-Marker"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="s390-Literal-Pool-Entries.html#s390-Literal-Pool-Entries">s390 Literal Pool Entries</a>, |
| Previous: <a rel="previous" accesskey="p" href="s390-Operand-Modifier.html#s390-Operand-Modifier">s390 Operand Modifier</a>, |
| Up: <a rel="up" accesskey="u" href="s390-Syntax.html#s390-Syntax">s390 Syntax</a> |
| <hr> |
| </div> |
| |
| <h5 class="subsubsection">9.31.3.7 Instruction Marker</h5> |
| |
| <p><a name="index-instruction-marker_002c-s390-1546"></a><a name="index-s390-instruction-marker-1547"></a> |
| The thread local storage instruction markers are used by the linker to |
| perform code optimization. |
| |
| <dl> |
| <dt><code>:tls_load</code><dd>The :tls_load marker is used to flag the load instruction in the initial |
| exec TLS model that retrieves the offset from the thread pointer to a |
| thread local storage variable from the GOT. |
| <br><dt><code>:tls_gdcall</code><dd>The :tls_gdcall marker is used to flag the branch-and-save instruction to |
| the __tls_get_offset function in the global dynamic TLS model. |
| <br><dt><code>:tls_ldcall</code><dd>The :tls_ldcall marker is used to flag the branch-and-save instruction to |
| the __tls_get_offset function in the local dynamic TLS model. |
| </dl> |
| |
| <p>For more information about the thread local storage instruction marker |
| and the linker optimizations see the ELF extension documentation |
| ‘<samp><span class="samp">ELF Handling For Thread-Local Storage</span></samp>’. |
| |
| </body></html> |
| |
