| <html lang="en"> |
| <head> |
| <title>HPPA ELF32 - Untitled</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Untitled"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Machine-Dependent.html#Machine-Dependent" title="Machine Dependent"> |
| <link rel="prev" href="ARM.html#ARM" title="ARM"> |
| <link rel="next" href="M68K.html#M68K" title="M68K"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| This file documents the GNU linker LD |
| (GNU Toolchain for the A-profile Architecture 9.2-2019.12 (arm-9.10)) |
| version 2.33.1. |
| |
| Copyright (C) 1991-2019 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 |
| or any later version published by the Free Software Foundation; |
| with no Invariant Sections, with no Front-Cover Texts, and with no |
| Back-Cover Texts. A copy of the license is included in the |
| section entitled ``GNU Free Documentation License''.--> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="HPPA-ELF32"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="M68K.html#M68K">M68K</a>, |
| Previous: <a rel="previous" accesskey="p" href="ARM.html#ARM">ARM</a>, |
| Up: <a rel="up" accesskey="u" href="Machine-Dependent.html#Machine-Dependent">Machine Dependent</a> |
| <hr> |
| </div> |
| |
| <h3 class="section">4.4 <samp><span class="command">ld</span></samp> and HPPA 32-bit ELF Support</h3> |
| |
| <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 |
| 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-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 |
| 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. |
| |
| </body></html> |
| |