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.
89 lines
3.8 KiB
HTML
89 lines
3.8 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>ARM-Relocations - 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="ARM-Syntax.html#ARM-Syntax" title="ARM Syntax">
|
|
<link rel="prev" href="ARM_002dRegs.html#ARM_002dRegs" title="ARM-Regs">
|
|
<link rel="next" href="ARM_002dNeon_002dAlignment.html#ARM_002dNeon_002dAlignment" title="ARM-Neon-Alignment">
|
|
<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="ARM-Relocations"></a>
|
|
<a name="ARM_002dRelocations"></a>
|
|
<p>
|
|
Next: <a rel="next" accesskey="n" href="ARM_002dNeon_002dAlignment.html#ARM_002dNeon_002dAlignment">ARM-Neon-Alignment</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="ARM_002dRegs.html#ARM_002dRegs">ARM-Regs</a>,
|
|
Up: <a rel="up" accesskey="u" href="ARM-Syntax.html#ARM-Syntax">ARM Syntax</a>
|
|
<hr>
|
|
</div>
|
|
|
|
<h5 class="subsubsection">9.4.2.4 ARM relocation generation</h5>
|
|
|
|
<p><a name="index-data-relocations_002c-ARM-723"></a><a name="index-ARM-data-relocations-724"></a>Specific data relocations can be generated by putting the relocation name
|
|
in parentheses after the symbol name. For example:
|
|
|
|
<pre class="smallexample"> .word foo(TARGET1)
|
|
</pre>
|
|
<p>This will generate an ‘<samp><span class="samp">R_ARM_TARGET1</span></samp>’ relocation against the symbol
|
|
<var>foo</var>.
|
|
The following relocations are supported:
|
|
<code>GOT</code>,
|
|
<code>GOTOFF</code>,
|
|
<code>TARGET1</code>,
|
|
<code>TARGET2</code>,
|
|
<code>SBREL</code>,
|
|
<code>TLSGD</code>,
|
|
<code>TLSLDM</code>,
|
|
<code>TLSLDO</code>,
|
|
<code>TLSDESC</code>,
|
|
<code>TLSCALL</code>,
|
|
<code>GOTTPOFF</code>,
|
|
<code>GOT_PREL</code>
|
|
and
|
|
<code>TPOFF</code>.
|
|
|
|
<p>For compatibility with older toolchains the assembler also accepts
|
|
<code>(PLT)</code> after branch targets. On legacy targets this will
|
|
generate the deprecated ‘<samp><span class="samp">R_ARM_PLT32</span></samp>’ relocation. On EABI
|
|
targets it will encode either the ‘<samp><span class="samp">R_ARM_CALL</span></samp>’ or
|
|
‘<samp><span class="samp">R_ARM_JUMP24</span></samp>’ relocation, as appropriate.
|
|
|
|
<p><a name="index-MOVW-and-MOVT-relocations_002c-ARM-725"></a>Relocations for ‘<samp><span class="samp">MOVW</span></samp>’ and ‘<samp><span class="samp">MOVT</span></samp>’ instructions can be generated
|
|
by prefixing the value with ‘<samp><span class="samp">#:lower16:</span></samp>’ and ‘<samp><span class="samp">#:upper16</span></samp>’
|
|
respectively. For example to load the 32-bit address of foo into r0:
|
|
|
|
<pre class="smallexample"> MOVW r0, #:lower16:foo
|
|
MOVT r0, #:upper16:foo
|
|
</pre>
|
|
</body></html>
|
|
|