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130 lines
5.6 KiB
HTML
130 lines
5.6 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>GNU Object Attributes - Using as</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Object-Attributes.html#Object-Attributes" title="Object Attributes">
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<link rel="next" href="Defining-New-Object-Attributes.html#Defining-New-Object-Attributes" title="Defining New Object Attributes">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 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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<meta http-equiv="Content-Style-Type" content="text/css">
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<style type="text/css"><!--
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pre.display { font-family:inherit }
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pre.format { font-family:inherit }
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pre.smalldisplay { font-family:inherit; font-size:smaller }
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pre.smallformat { font-family:inherit; font-size:smaller }
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pre.smallexample { font-size:smaller }
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pre.smalllisp { font-size:smaller }
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span.sc { font-variant:small-caps }
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span.roman { font-family:serif; font-weight:normal; }
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span.sansserif { font-family:sans-serif; font-weight:normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="GNU-Object-Attributes"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Defining-New-Object-Attributes.html#Defining-New-Object-Attributes">Defining New Object Attributes</a>,
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Up: <a rel="up" accesskey="u" href="Object-Attributes.html#Object-Attributes">Object Attributes</a>
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<hr>
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</div>
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<h3 class="section">8.1 <span class="sc">gnu</span> 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><span class="samp">gnu</span></samp>’.
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<p>Except for ‘<samp><span class="samp">Tag_compatibility</span></samp>’, which has both an integer and a string for
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its value, <span class="sc">gnu</span> 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 (<var>tag</var><code> &
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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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<h4 class="subsection">8.1.1 Common <span class="sc">gnu</span> attributes</h4>
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<p>These attributes are valid on all architectures.
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<dl>
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<dt><span class="roman">Tag_compatibility (32)</span><dd>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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</dl>
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<h4 class="subsection">8.1.2 MIPS Attributes</h4>
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<dl>
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<dt><span class="roman">Tag_GNU_MIPS_ABI_FP (4)</span><dd>The floating-point ABI used by this object file. The value will be:
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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>1 for files using the hardware floating-point ABI with a standard
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double-precision FPU.
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<li>2 for files using the hardware floating-point ABI with a single-precision FPU.
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<li>3 for files using the software floating-point ABI.
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<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>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>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>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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</ul>
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</dl>
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<h4 class="subsection">8.1.3 PowerPC Attributes</h4>
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<dl>
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<dt><span class="roman">Tag_GNU_Power_ABI_FP (4)</span><dd>The floating-point ABI used by this object file. The value will be:
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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>1 for files using double-precision hardware floating-point ABI.
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<li>2 for files using the software floating-point ABI.
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<li>3 for files using single-precision hardware floating-point ABI.
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</ul>
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<br><dt><span class="roman">Tag_GNU_Power_ABI_Vector (8)</span><dd>The vector ABI used by this object file. The value will be:
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<ul>
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<li>0 for files not affected by the vector ABI.
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<li>1 for files using general purpose registers to pass vectors.
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<li>2 for files using AltiVec registers to pass vectors.
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<li>3 for files using SPE registers to pass vectors.
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</ul>
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</dl>
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<h4 class="subsection">8.1.4 IBM z Systems Attributes</h4>
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<dl>
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<dt><span class="roman">Tag_GNU_S390_ABI_Vector (8)</span><dd>The vector ABI used by this object file. The value will be:
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<ul>
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<li>0 for files not affected by the vector ABI.
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<li>1 for files using software vector ABI.
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<li>2 for files using hardware vector ABI.
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</ul>
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</dl>
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</body></html>
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