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121 lines
5.6 KiB
HTML
121 lines
5.6 KiB
HTML
4 years ago
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<!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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-->
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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 Literal Pool Entries (Using as)</title>
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<meta name="description" content="s390 Literal Pool Entries (Using as)">
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<meta name="keywords" content="s390 Literal Pool Entries (Using as)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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-Directives.html#s390-Directives" rel="next" title="s390 Directives">
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<link href="s390-Instruction-Marker.html#s390-Instruction-Marker" rel="prev" title="s390 Instruction Marker">
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</style>
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</head>
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<body lang="en">
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<a name="s390-Literal-Pool-Entries"></a>
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<div class="header">
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<p>
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Previous: <a href="s390-Instruction-Marker.html#s390-Instruction-Marker" accesskey="p" rel="prev">s390 Instruction Marker</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="Literal-Pool-Entries"></a>
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<h4 class="subsubsection">9.40.3.8 Literal Pool Entries</h4>
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<a name="index-literal-pool-entries_002c-s390"></a>
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<a name="index-s390-literal-pool-entries"></a>
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<p>A literal pool is a collection of values. To access the values a pointer
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to the literal pool is loaded to a register, the literal pool register.
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Usually, register %r13 is used as the literal pool register
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(<a href="s390-Register.html#s390-Register">s390 Register</a>). Literal pool entries are created by adding the
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suffix :lit1, :lit2, :lit4, or :lit8 to the end of an expression for an
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instruction operand. The expression is added to the literal pool and the
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operand is replaced with the offset to the literal in the literal pool.
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</p>
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<dl compact="compact">
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<dt><code>:lit1</code></dt>
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<dd><p>The literal pool entry is created as an 8-bit value. An operand modifier
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must not be used for the original expression.
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</p></dd>
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<dt><code>:lit2</code></dt>
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<dd><p>The literal pool entry is created as a 16 bit value. The operand modifier
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@got may be used in the original expression. The term ‘<samp>x@got:lit2</samp>’
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will put the got offset for the global symbol x to the literal pool as
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16 bit value.
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</p></dd>
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<dt><code>:lit4</code></dt>
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<dd><p>The literal pool entry is created as a 32-bit value. The operand modifier
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@got and @plt may be used in the original expression. The term
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‘<samp>x@got:lit4</samp>’ will put the got offset for the global symbol x to the
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literal pool as a 32-bit value. The term ‘<samp>x@plt:lit4</samp>’ will put the
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plt offset for the global symbol x to the literal pool as a 32-bit value.
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</p></dd>
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<dt><code>:lit8</code></dt>
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<dd><p>The literal pool entry is created as a 64-bit value. The operand modifier
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@got and @plt may be used in the original expression. The term
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‘<samp>x@got:lit8</samp>’ will put the got offset for the global symbol x to the
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literal pool as a 64-bit value. The term ‘<samp>x@plt:lit8</samp>’ will put the
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plt offset for the global symbol x to the literal pool as a 64-bit value.
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</p></dd>
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</dl>
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<p>The assembler directive ‘<samp>.ltorg</samp>’ is used to emit all literal pool
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entries to the current position.
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</p>
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<hr>
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<div class="header">
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<p>
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Previous: <a href="s390-Instruction-Marker.html#s390-Instruction-Marker" accesskey="p" rel="prev">s390 Instruction Marker</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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</body>
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</html>
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