176 lines
7.5 KiB
HTML
176 lines
7.5 KiB
HTML
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- This file documents the GNU Assembler "as".
|
||
|
|
|
||
|
|
Copyright (C) 1991-2016 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".
|
||
|
|
-->
|
||
|
|
<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>Using as: GNU Object Attributes</title>
|
||
|
|
|
||
|
|
<meta name="description" content="Using as: GNU Object Attributes">
|
||
|
|
<meta name="keywords" content="Using as: GNU Object Attributes">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content="makeinfo">
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<link href="index.html#Top" rel="start" title="Top">
|
||
|
|
<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="Object-Attributes.html#Object-Attributes" rel="up" title="Object Attributes">
|
||
|
|
<link href="Defining-New-Object-Attributes.html#Defining-New-Object-Attributes" rel="next" title="Defining New Object Attributes">
|
||
|
|
<link href="Object-Attributes.html#Object-Attributes" rel="prev" title="Object Attributes">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.summary-letter {text-decoration: none}
|
||
|
|
blockquote.smallquotation {font-size: smaller}
|
||
|
|
div.display {margin-left: 3.2em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
div.indentedblock {margin-left: 3.2em}
|
||
|
|
div.lisp {margin-left: 3.2em}
|
||
|
|
div.smalldisplay {margin-left: 3.2em}
|
||
|
|
div.smallexample {margin-left: 3.2em}
|
||
|
|
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
|
||
|
|
div.smalllisp {margin-left: 3.2em}
|
||
|
|
kbd {font-style:oblique}
|
||
|
|
pre.display {font-family: inherit}
|
||
|
|
pre.format {font-family: inherit}
|
||
|
|
pre.menu-comment {font-family: serif}
|
||
|
|
pre.menu-preformatted {font-family: serif}
|
||
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smallexample {font-size: smaller}
|
||
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smalllisp {font-size: smaller}
|
||
|
|
span.nocodebreak {white-space:nowrap}
|
||
|
|
span.nolinebreak {white-space:nowrap}
|
||
|
|
span.roman {font-family:serif; font-weight:normal}
|
||
|
|
span.sansserif {font-family:sans-serif; font-weight:normal}
|
||
|
|
ul.no-bullet {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
|
||
|
|
<a name="GNU-Object-Attributes"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Defining-New-Object-Attributes.html#Defining-New-Object-Attributes" accesskey="n" rel="next">Defining New Object Attributes</a>, Up: <a href="Object-Attributes.html#Object-Attributes" accesskey="u" rel="up">Object Attributes</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>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<a name="GNU-Object-Attributes-1"></a>
|
||
|
|
<h3 class="section">8.1 <small>GNU</small> Object Attributes</h3>
|
||
|
|
|
||
|
|
<p>The <code>.gnu_attribute</code> directive records an object attribute
|
||
|
|
with vendor ‘<samp>gnu</samp>’.
|
||
|
|
</p>
|
||
|
|
<p>Except for ‘<samp>Tag_compatibility</samp>’, which has both an integer and a string for
|
||
|
|
its value, <small>GNU</small> attributes have a string value if the tag number is odd and
|
||
|
|
an integer value if the tag number is even. The second bit (<code><var>tag</var> &
|
||
|
|
2</code> is set for architecture-independent attributes and clear for
|
||
|
|
architecture-dependent ones.
|
||
|
|
</p>
|
||
|
|
<a name="Common-GNU-attributes"></a>
|
||
|
|
<h4 class="subsection">8.1.1 Common <small>GNU</small> attributes</h4>
|
||
|
|
|
||
|
|
<p>These attributes are valid on all architectures.
|
||
|
|
</p>
|
||
|
|
<dl compact="compact">
|
||
|
|
<dt><span class="roman">Tag_compatibility (32)</span></dt>
|
||
|
|
<dd><p>The compatibility attribute takes an integer flag value and a vendor name. If
|
||
|
|
the flag value is 0, the file is compatible with other toolchains. If it is 1,
|
||
|
|
then the file is only compatible with the named toolchain. If it is greater
|
||
|
|
than 1, the file can only be processed by other toolchains under some private
|
||
|
|
arrangement indicated by the flag value and the vendor name.
|
||
|
|
</p></dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<a name="MIPS-Attributes"></a>
|
||
|
|
<h4 class="subsection">8.1.2 MIPS Attributes</h4>
|
||
|
|
|
||
|
|
<dl compact="compact">
|
||
|
|
<dt><span class="roman">Tag_GNU_MIPS_ABI_FP (4)</span></dt>
|
||
|
|
<dd><p>The floating-point ABI used by this object file. The value will be:
|
||
|
|
</p>
|
||
|
|
<ul>
|
||
|
|
<li> 0 for files not affected by the floating-point ABI.
|
||
|
|
</li><li> 1 for files using the hardware floating-point ABI with a standard
|
||
|
|
double-precision FPU.
|
||
|
|
</li><li> 2 for files using the hardware floating-point ABI with a single-precision FPU.
|
||
|
|
</li><li> 3 for files using the software floating-point ABI.
|
||
|
|
</li><li> 4 for files using the deprecated hardware floating-point ABI which used 64-bit
|
||
|
|
floating-point registers, 32-bit general-purpose registers and increased the
|
||
|
|
number of callee-saved floating-point registers.
|
||
|
|
</li><li> 5 for files using the hardware floating-point ABI with a double-precision FPU
|
||
|
|
with either 32-bit or 64-bit floating-point registers and 32-bit
|
||
|
|
general-purpose registers.
|
||
|
|
</li><li> 6 for files using the hardware floating-point ABI with 64-bit floating-point
|
||
|
|
registers and 32-bit general-purpose registers.
|
||
|
|
</li><li> 7 for files using the hardware floating-point ABI with 64-bit floating-point
|
||
|
|
registers, 32-bit general-purpose registers and a rule that forbids the
|
||
|
|
direct use of odd-numbered single-precision floating-point registers.
|
||
|
|
</li></ul>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<a name="PowerPC-Attributes"></a>
|
||
|
|
<h4 class="subsection">8.1.3 PowerPC Attributes</h4>
|
||
|
|
|
||
|
|
<dl compact="compact">
|
||
|
|
<dt><span class="roman">Tag_GNU_Power_ABI_FP (4)</span></dt>
|
||
|
|
<dd><p>The floating-point ABI used by this object file. The value will be:
|
||
|
|
</p>
|
||
|
|
<ul>
|
||
|
|
<li> 0 for files not affected by the floating-point ABI.
|
||
|
|
</li><li> 1 for files using double-precision hardware floating-point ABI.
|
||
|
|
</li><li> 2 for files using the software floating-point ABI.
|
||
|
|
</li><li> 3 for files using single-precision hardware floating-point ABI.
|
||
|
|
</li></ul>
|
||
|
|
|
||
|
|
</dd>
|
||
|
|
<dt><span class="roman">Tag_GNU_Power_ABI_Vector (8)</span></dt>
|
||
|
|
<dd><p>The vector ABI used by this object file. The value will be:
|
||
|
|
</p>
|
||
|
|
<ul>
|
||
|
|
<li> 0 for files not affected by the vector ABI.
|
||
|
|
</li><li> 1 for files using general purpose registers to pass vectors.
|
||
|
|
</li><li> 2 for files using AltiVec registers to pass vectors.
|
||
|
|
</li><li> 3 for files using SPE registers to pass vectors.
|
||
|
|
</li></ul>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<a name="IBM-z-Systems-Attributes"></a>
|
||
|
|
<h4 class="subsection">8.1.4 IBM z Systems Attributes</h4>
|
||
|
|
|
||
|
|
<dl compact="compact">
|
||
|
|
<dt><span class="roman">Tag_GNU_S390_ABI_Vector (8)</span></dt>
|
||
|
|
<dd><p>The vector ABI used by this object file. The value will be:
|
||
|
|
</p>
|
||
|
|
<ul>
|
||
|
|
<li> 0 for files not affected by the vector ABI.
|
||
|
|
</li><li> 1 for files using software vector ABI.
|
||
|
|
</li><li> 2 for files using hardware vector ABI.
|
||
|
|
</li></ul>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Defining-New-Object-Attributes.html#Defining-New-Object-Attributes" accesskey="n" rel="next">Defining New Object Attributes</a>, Up: <a href="Object-Attributes.html#Object-Attributes" accesskey="u" rel="up">Object Attributes</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>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|