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| <a name="ld-and-HPPA-32_002dbit-ELF-Support"></a> |
| <h3 class="section">4.5 <code>ld</code> and HPPA 32-bit ELF Support</h3> |
| <a name="index-HPPA-multiple-sub_002dspace-stubs"></a> |
| <a name="index-_002d_002dmulti_002dsubspace"></a> |
| <p>When generating a shared library, <code>ld</code> will by default generate |
| import stubs suitable for use with a single sub-space application. |
| The ‘<samp>--multi-subspace</samp>’ switch causes <code>ld</code> to generate export |
| stubs, and different (larger) import stubs suitable for use with |
| multiple sub-spaces. |
| </p> |
| <a name="index-HPPA-stub-grouping"></a> |
| <a name="index-_002d_002dstub_002dgroup_002dsize_003dN-1"></a> |
| <p>Long branch stubs and import/export stubs are placed by <code>ld</code> in |
| stub sections located between groups of input sections. |
| ‘<samp>--stub-group-size</samp>’ specifies the maximum size of a group of input |
| sections handled by one stub section. Since branch offsets are signed, |
| a stub section may serve two groups of input sections, one group before |
| the stub section, and one group after it. However, when using |
| conditional branches that require stubs, it may be better (for branch |
| prediction) that stub sections only serve one group of input sections. |
| A negative value for ‘<samp>N</samp>’ chooses this scheme, ensuring that |
| branches to stubs always use a negative offset. Two special values of |
| ‘<samp>N</samp>’ are recognized, ‘<samp>1</samp>’ and ‘<samp>-1</samp>’. These both instruct |
| <code>ld</code> to automatically size input section groups for the branch types |
| detected, with the same behaviour regarding stub placement as other |
| positive or negative values of ‘<samp>N</samp>’ respectively. |
| </p> |
| <p>Note that ‘<samp>--stub-group-size</samp>’ does not split input sections. A |
| single input section larger than the group size specified will of course |
| create a larger group (of one section). If input sections are too |
| large, it may not be possible for a branch to reach its stub. |
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