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77 lines
4.0 KiB
HTML
77 lines
4.0 KiB
HTML
15 years ago
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<html lang="en">
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<title>HPPA ELF32 - Untitled</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Untitled">
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<meta name="generator" content="makeinfo 4.7">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Machine-Dependent.html#Machine-Dependent" title="Machine Dependent">
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<link rel="prev" href="ARM.html#ARM" title="ARM">
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<link rel="next" href="M68K.html#M68K" title="M68K">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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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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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.1
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.-->
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<style type="text/css"><!--
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--></style>
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</head>
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<body>
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<div class="node">
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<p>
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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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Previous: <a rel="previous" accesskey="p" href="ARM.html#ARM">ARM</a>,
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Up: <a rel="up" accesskey="u" href="Machine-Dependent.html#Machine-Dependent">Machine Dependent</a>
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<hr><br>
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</div>
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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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</body></html>
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