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| <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> |
| |
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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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