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175 lines
7.4 KiB
HTML
175 lines
7.4 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>GNU Object Attributes (Using as)</title>
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<meta name="description" content="GNU Object Attributes (Using as)">
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<meta name="keywords" content="GNU Object Attributes (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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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="Object-Attributes.html#Object-Attributes" rel="up" title="Object Attributes">
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<link href="Defining-New-Object-Attributes.html#Defining-New-Object-Attributes" rel="next" title="Defining New Object Attributes">
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<link href="Object-Attributes.html#Object-Attributes" rel="prev" title="Object Attributes">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="GNU-Object-Attributes"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="GNU-Object-Attributes-1"></a>
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<h3 class="section">8.1 <small>GNU</small> Object Attributes</h3>
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<p>The <code>.gnu_attribute</code> directive records an object attribute
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with vendor ‘<samp>gnu</samp>’.
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</p>
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<p>Except for ‘<samp>Tag_compatibility</samp>’, which has both an integer and a string for
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its value, <small>GNU</small> attributes have a string value if the tag number is odd and
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an integer value if the tag number is even. The second bit (<code><var>tag</var> &
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2</code> is set for architecture-independent attributes and clear for
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architecture-dependent ones.
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</p>
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<a name="Common-GNU-attributes"></a>
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<h4 class="subsection">8.1.1 Common <small>GNU</small> attributes</h4>
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<p>These attributes are valid on all architectures.
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</p>
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<dl compact="compact">
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<dt><span class="roman">Tag_compatibility (32)</span></dt>
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<dd><p>The compatibility attribute takes an integer flag value and a vendor name. If
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the flag value is 0, the file is compatible with other toolchains. If it is 1,
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then the file is only compatible with the named toolchain. If it is greater
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than 1, the file can only be processed by other toolchains under some private
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arrangement indicated by the flag value and the vendor name.
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</p></dd>
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</dl>
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<a name="MIPS-Attributes"></a>
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<h4 class="subsection">8.1.2 MIPS Attributes</h4>
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<dl compact="compact">
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<dt><span class="roman">Tag_GNU_MIPS_ABI_FP (4)</span></dt>
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<dd><p>The floating-point ABI used by this object file. The value will be:
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</p>
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<ul>
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<li> 0 for files not affected by the floating-point ABI.
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</li><li> 1 for files using the hardware floating-point ABI with a standard
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double-precision FPU.
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</li><li> 2 for files using the hardware floating-point ABI with a single-precision FPU.
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</li><li> 3 for files using the software floating-point ABI.
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</li><li> 4 for files using the deprecated hardware floating-point ABI which used 64-bit
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floating-point registers, 32-bit general-purpose registers and increased the
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number of callee-saved floating-point registers.
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</li><li> 5 for files using the hardware floating-point ABI with a double-precision FPU
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with either 32-bit or 64-bit floating-point registers and 32-bit
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general-purpose registers.
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</li><li> 6 for files using the hardware floating-point ABI with 64-bit floating-point
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registers and 32-bit general-purpose registers.
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</li><li> 7 for files using the hardware floating-point ABI with 64-bit floating-point
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registers, 32-bit general-purpose registers and a rule that forbids the
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direct use of odd-numbered single-precision floating-point registers.
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</li></ul>
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</dd>
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</dl>
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<a name="PowerPC-Attributes"></a>
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<h4 class="subsection">8.1.3 PowerPC Attributes</h4>
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<dl compact="compact">
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<dt><span class="roman">Tag_GNU_Power_ABI_FP (4)</span></dt>
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<dd><p>The floating-point ABI used by this object file. The value will be:
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</p>
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<ul>
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<li> 0 for files not affected by the floating-point ABI.
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</li><li> 1 for files using double-precision hardware floating-point ABI.
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</li><li> 2 for files using the software floating-point ABI.
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</li><li> 3 for files using single-precision hardware floating-point ABI.
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</li></ul>
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</dd>
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<dt><span class="roman">Tag_GNU_Power_ABI_Vector (8)</span></dt>
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<dd><p>The vector ABI used by this object file. The value will be:
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</p>
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<ul>
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<li> 0 for files not affected by the vector ABI.
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</li><li> 1 for files using general purpose registers to pass vectors.
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</li><li> 2 for files using AltiVec registers to pass vectors.
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</li><li> 3 for files using SPE registers to pass vectors.
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</li></ul>
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</dd>
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</dl>
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<a name="IBM-z-Systems-Attributes"></a>
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<h4 class="subsection">8.1.4 IBM z Systems Attributes</h4>
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<dl compact="compact">
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<dt><span class="roman">Tag_GNU_S390_ABI_Vector (8)</span></dt>
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<dd><p>The vector ABI used by this object file. The value will be:
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</p>
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<ul>
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<li> 0 for files not affected by the vector ABI.
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</li><li> 1 for files using software vector ABI.
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</li><li> 2 for files using hardware vector ABI.
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</li></ul>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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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>
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</div>
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</body>
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</html>
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