78 lines
4.3 KiB
HTML
78 lines
4.3 KiB
HTML
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<html lang="en">
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<title>HPPA ELF32 - Untitled</title>
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<meta name="description" content="Untitled">
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<meta name="generator" content="makeinfo 4.13">
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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 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 Toolchain for the A-profile Architecture 9.2-2019.12 (arm-9.10))
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version 2.33.1.
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Copyright (C) 1991-2019 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 1.3
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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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</head>
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<body>
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<div class="node">
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<a name="HPPA-ELF32"></a>
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<p>
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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>
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</div>
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<h3 class="section">4.4 <samp><span class="command">ld</span></samp> and HPPA 32-bit ELF Support</h3>
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<p><a name="index-HPPA-multiple-sub_002dspace-stubs-682"></a><a name="index-g_t_002d_002dmulti_002dsubspace-683"></a>When generating a shared library, <samp><span class="command">ld</span></samp> will by default generate
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import stubs suitable for use with a single sub-space application.
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The ‘<samp><span class="samp">--multi-subspace</span></samp>’ switch causes <samp><span class="command">ld</span></samp> 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-684"></a><a name="index-g_t_002d_002dstub_002dgroup_002dsize_003d_0040var_007bN_007d-685"></a>Long branch stubs and import/export stubs are placed by <samp><span class="command">ld</span></samp> in
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stub sections located between groups of input sections.
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‘<samp><span class="samp">--stub-group-size</span></samp>’ 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 ‘<samp><span class="samp">N</span></samp>’ 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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‘<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
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<samp><span class="command">ld</span></samp> 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 ‘<samp><span class="samp">N</span></samp>’ respectively.
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<p>Note that ‘<samp><span class="samp">--stub-group-size</span></samp>’ 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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