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| <h3 class="section">4.5 <samp><span class="command">ld</span></samp> and HPPA 32-bit ELF Support</h3> |
| |
| <p><a name="index-HPPA-multiple-sub_002dspace-stubs-607"></a><a name="index-g_t_002d_002dmulti_002dsubspace-608"></a>When generating a shared library, <samp><span class="command">ld</span></samp> will by default generate |
| import stubs suitable for use with a single sub-space application. |
| The ‘<samp><span class="samp">--multi-subspace</span></samp>’ switch causes <samp><span class="command">ld</span></samp> to generate export |
| stubs, and different (larger) import stubs suitable for use with |
| multiple sub-spaces. |
| |
| <p><a name="index-HPPA-stub-grouping-609"></a><a name="index-g_t_002d_002dstub_002dgroup_002dsize_003d_0040var_007bN_007d-610"></a>Long branch stubs and import/export stubs are placed by <samp><span class="command">ld</span></samp> in |
| stub sections located between groups of input sections. |
| ‘<samp><span class="samp">--stub-group-size</span></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><span class="samp">N</span></samp>’ chooses this scheme, ensuring that |
| branches to stubs always use a negative offset. Two special values of |
| ‘<samp><span class="samp">N</span></samp>’ are recognized, ‘<samp><span class="samp">1</span></samp>’ and ‘<samp><span class="samp">-1</span></samp>’. These both instruct |
| <samp><span class="command">ld</span></samp> 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><span class="samp">N</span></samp>’ respectively. |
| |
| <p>Note that ‘<samp><span class="samp">--stub-group-size</span></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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