You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
81 lines
4.1 KiB
HTML
81 lines
4.1 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>s390 Literal Pool Entries - 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-Instruction-Marker.html#s390-Instruction-Marker" title="s390 Instruction Marker">
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
<!--
|
|
This file documents the GNU Assembler "as".
|
|
|
|
Copyright (C) 1991-2015 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>
|
|
</head>
|
|
<body>
|
|
<div class="node">
|
|
<a name="s390-Literal-Pool-Entries"></a>
|
|
<p>
|
|
Previous: <a rel="previous" accesskey="p" href="s390-Instruction-Marker.html#s390-Instruction-Marker">s390 Instruction Marker</a>,
|
|
Up: <a rel="up" accesskey="u" href="s390-Syntax.html#s390-Syntax">s390 Syntax</a>
|
|
<hr>
|
|
</div>
|
|
|
|
<h5 class="subsubsection">9.38.3.8 Literal Pool Entries</h5>
|
|
|
|
<p><a name="index-literal-pool-entries_002c-s390-1905"></a><a name="index-s390-literal-pool-entries-1906"></a>
|
|
A literal pool is a collection of values. To access the values a pointer
|
|
to the literal pool is loaded to a register, the literal pool register.
|
|
Usually, register %r13 is used as the literal pool register
|
|
(<a href="s390-Register.html#s390-Register">s390 Register</a>). Literal pool entries are created by adding the
|
|
suffix :lit1, :lit2, :lit4, or :lit8 to the end of an expression for an
|
|
instruction operand. The expression is added to the literal pool and the
|
|
operand is replaced with the offset to the literal in the literal pool.
|
|
|
|
<dl>
|
|
<dt><code>:lit1</code><dd>The literal pool entry is created as an 8-bit value. An operand modifier
|
|
must not be used for the original expression.
|
|
<br><dt><code>:lit2</code><dd>The literal pool entry is created as a 16 bit value. The operand modifier
|
|
@got may be used in the original expression. The term ‘<samp><span class="samp">x@got:lit2</span></samp>’
|
|
will put the got offset for the global symbol x to the literal pool as
|
|
16 bit value.
|
|
<br><dt><code>:lit4</code><dd>The literal pool entry is created as a 32-bit value. The operand modifier
|
|
@got and @plt may be used in the original expression. The term
|
|
‘<samp><span class="samp">x@got:lit4</span></samp>’ will put the got offset for the global symbol x to the
|
|
literal pool as a 32-bit value. The term ‘<samp><span class="samp">x@plt:lit4</span></samp>’ will put the
|
|
plt offset for the global symbol x to the literal pool as a 32-bit value.
|
|
<br><dt><code>:lit8</code><dd>The literal pool entry is created as a 64-bit value. The operand modifier
|
|
@got and @plt may be used in the original expression. The term
|
|
‘<samp><span class="samp">x@got:lit8</span></samp>’ will put the got offset for the global symbol x to the
|
|
literal pool as a 64-bit value. The term ‘<samp><span class="samp">x@plt:lit8</span></samp>’ will put the
|
|
plt offset for the global symbol x to the literal pool as a 64-bit value.
|
|
</dl>
|
|
|
|
<p>The assembler directive ‘<samp><span class="samp">.ltorg</span></samp>’ is used to emit all literal pool
|
|
entries to the current position.
|
|
|
|
</body></html>
|
|
|