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<title>Using as: GNU Object Attributes</title>
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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="M680x0-Attributes"></a>
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<h4 class="subsection">8.1.2 M680x0 Attributes</h4>
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<dl compact="compact">
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<dt><span class="roman">Tag_GNU_M68K_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></ul>
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</dd>
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</dl>
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<a name="MIPS-Attributes"></a>
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<h4 class="subsection">8.1.3 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">8.1.4 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">8.1.5 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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<a name="MSP430-Attributes"></a>
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<h4 class="subsection">8.1.6 MSP430 Attributes</h4>
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<dl compact="compact">
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<dt><span class="roman">Tag_GNU_MSP430_Data_Region (4)</span></dt>
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<dd><p>The data region 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 using the large memory model.
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</li><li> 1 for files which have been compiled with the condition that all
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data is in the lower memory region, i.e. below address 0x10000.
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</li><li> 2 for files which allow data to be placed in the full 20-bit memory range.
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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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