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76 lines
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<!--
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This file documents the GNU linker LD
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(GNU Binutils)
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version 2.19.
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000,
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2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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<a name="HPPA-ELF32"></a>Next: <a rel="next" accesskey="n" href="M68K.html#M68K">M68K</a>,
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<h3 class="section">4.5 <span class="command">ld</span> and HPPA 32-bit ELF Support</h3>
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<p><a name="index-HPPA-multiple-sub_002dspace-stubs-560"></a><a name="index-_002d_002dmulti_002dsubspace-561"></a>When generating a shared library, <span class="command">ld</span> will by default generate
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import stubs suitable for use with a single sub-space application.
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The <span class="samp">--multi-subspace</span> switch causes <span class="command">ld</span> to generate export
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stubs, and different (larger) import stubs suitable for use with
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multiple sub-spaces.
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<p><a name="index-HPPA-stub-grouping-562"></a><a name="index-_002d_002dstub_002dgroup_002dsize_003d_0040var_007bN_007d-563"></a>Long branch stubs and import/export stubs are placed by <span class="command">ld</span> in
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stub sections located between groups of input sections.
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<span class="samp">--stub-group-size</span> specifies the maximum size of a group of input
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sections handled by one stub section. Since branch offsets are signed,
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a stub section may serve two groups of input sections, one group before
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the stub section, and one group after it. However, when using
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conditional branches that require stubs, it may be better (for branch
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prediction) that stub sections only serve one group of input sections.
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A negative value for <span class="samp">N</span> chooses this scheme, ensuring that
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branches to stubs always use a negative offset. Two special values of
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<span class="samp">N</span> are recognized, <span class="samp">1</span> and <span class="samp">-1</span>. These both instruct
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<span class="command">ld</span> to automatically size input section groups for the branch types
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detected, with the same behaviour regarding stub placement as other
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positive or negative values of <span class="samp">N</span> respectively.
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<p>Note that <span class="samp">--stub-group-size</span> does not split input sections. A
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single input section larger than the group size specified will of course
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create a larger group (of one section). If input sections are too
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large, it may not be possible for a branch to reach its stub.
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