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108 lines
4.9 KiB
HTML
108 lines
4.9 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU linker LD
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(SiFive Binutils 2.32.0-2020.04.1)
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version 2.32.
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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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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>HPPA ELF32 (LD)</title>
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<meta name="description" content="HPPA ELF32 (LD)">
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<meta name="keywords" content="HPPA ELF32 (LD)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="LD-Index.html#LD-Index" rel="index" title="LD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Machine-Dependent.html#Machine-Dependent" rel="up" title="Machine Dependent">
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<link href="M68K.html#M68K" rel="next" title="M68K">
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<link href="ARM.html#ARM" rel="prev" title="ARM">
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<style type="text/css">
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="HPPA-ELF32"></a>
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<div class="header">
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<p>
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Next: <a href="M68K.html#M68K" accesskey="n" rel="next">M68K</a>, Previous: <a href="ARM.html#ARM" accesskey="p" rel="prev">ARM</a>, Up: <a href="Machine-Dependent.html#Machine-Dependent" accesskey="u" rel="up">Machine Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="ld-and-HPPA-32_002dbit-ELF-Support"></a>
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<h3 class="section">4.4 <code>ld</code> and HPPA 32-bit ELF Support</h3>
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<a name="index-HPPA-multiple-sub_002dspace-stubs"></a>
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<a name="index-_002d_002dmulti_002dsubspace"></a>
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<p>When generating a shared library, <code>ld</code> 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>--multi-subspace</samp>’ switch causes <code>ld</code> 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>
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<a name="index-HPPA-stub-grouping"></a>
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<a name="index-_002d_002dstub_002dgroup_002dsize_003dN-1"></a>
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<p>Long branch stubs and import/export stubs are placed by <code>ld</code> in
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stub sections located between groups of input sections.
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‘<samp>--stub-group-size</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>N</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>N</samp>’ are recognized, ‘<samp>1</samp>’ and ‘<samp>-1</samp>’. These both instruct
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<code>ld</code> 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>N</samp>’ respectively.
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</p>
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<p>Note that ‘<samp>--stub-group-size</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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</p>
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</body>
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</html>
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