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160 lines
6.9 KiB
HTML
160 lines
6.9 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>SPU ELF (LD)</title>
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<meta name="description" content="SPU ELF (LD)">
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<meta name="keywords" content="SPU ELF (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="TI-COFF.html#TI-COFF" rel="next" title="TI COFF">
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<link href="S_002f390-ELF.html#S_002f390-ELF" rel="prev" title="S/390 ELF">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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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="SPU-ELF"></a>
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<div class="header">
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<p>
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Next: <a href="TI-COFF.html#TI-COFF" accesskey="n" rel="next">TI COFF</a>, Previous: <a href="S_002f390-ELF.html#S_002f390-ELF" accesskey="p" rel="prev">S/390 ELF</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-SPU-ELF-Support"></a>
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<h3 class="section">4.14 <code>ld</code> and SPU ELF Support</h3>
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<a name="index-SPU-ELF-options"></a>
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<dl compact="compact">
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<dd>
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<a name="index-SPU-plugins"></a>
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<a name="index-_002d_002dplugin"></a>
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</dd>
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<dt><samp>--plugin</samp></dt>
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<dd><p>This option marks an executable as a PIC plugin module.
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</p>
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<a name="index-SPU-overlays"></a>
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<a name="index-_002d_002dno_002doverlays"></a>
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</dd>
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<dt><samp>--no-overlays</samp></dt>
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<dd><p>Normally, <code>ld</code> recognizes calls to functions within overlay
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regions, and redirects such calls to an overlay manager via a stub.
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<code>ld</code> also provides a built-in overlay manager. This option
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turns off all this special overlay handling.
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</p>
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<a name="index-SPU-overlay-stub-symbols"></a>
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<a name="index-_002d_002demit_002dstub_002dsyms-2"></a>
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</dd>
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<dt><samp>--emit-stub-syms</samp></dt>
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<dd><p>This option causes <code>ld</code> to label overlay stubs with a local
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symbol that encodes the stub type and destination.
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</p>
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<a name="index-SPU-extra-overlay-stubs"></a>
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<a name="index-_002d_002dextra_002doverlay_002dstubs"></a>
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</dd>
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<dt><samp>--extra-overlay-stubs</samp></dt>
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<dd><p>This option causes <code>ld</code> to add overlay call stubs on all
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function calls out of overlay regions. Normally stubs are not added
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on calls to non-overlay regions.
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</p>
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<a name="index-SPU-local-store-size"></a>
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<a name="index-_002d_002dlocal_002dstore_003dlo_003ahi"></a>
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</dd>
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<dt><samp>--local-store=lo:hi</samp></dt>
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<dd><p><code>ld</code> usually checks that a final executable for SPU fits in
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the address range 0 to 256k. This option may be used to change the
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range. Disable the check entirely with <samp>--local-store=0:0</samp>.
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</p>
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<a name="index-SPU"></a>
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<a name="index-_002d_002dstack_002danalysis"></a>
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</dd>
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<dt><samp>--stack-analysis</samp></dt>
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<dd><p>SPU local store space is limited. Over-allocation of stack space
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unnecessarily limits space available for code and data, while
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under-allocation results in runtime failures. If given this option,
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<code>ld</code> will provide an estimate of maximum stack usage.
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<code>ld</code> does this by examining symbols in code sections to
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determine the extents of functions, and looking at function prologues
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for stack adjusting instructions. A call-graph is created by looking
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for relocations on branch instructions. The graph is then searched
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for the maximum stack usage path. Note that this analysis does not
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find calls made via function pointers, and does not handle recursion
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and other cycles in the call graph. Stack usage may be
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under-estimated if your code makes such calls. Also, stack usage for
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dynamic allocation, e.g. alloca, will not be detected. If a link map
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is requested, detailed information about each function’s stack usage
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and calls will be given.
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</p>
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<a name="index-SPU-1"></a>
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<a name="index-_002d_002demit_002dstack_002dsyms"></a>
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</dd>
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<dt><samp>--emit-stack-syms</samp></dt>
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<dd><p>This option, if given along with <samp>--stack-analysis</samp> will result
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in <code>ld</code> emitting stack sizing symbols for each function.
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These take the form <code>__stack_<function_name></code> for global
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functions, and <code>__stack_<number>_<function_name></code> for static
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functions. <code><number></code> is the section id in hex. The value of
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such symbols is the stack requirement for the corresponding function.
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The symbol size will be zero, type <code>STT_NOTYPE</code>, binding
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<code>STB_LOCAL</code>, and section <code>SHN_ABS</code>.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="TI-COFF.html#TI-COFF" accesskey="n" rel="next">TI COFF</a>, Previous: <a href="S_002f390-ELF.html#S_002f390-ELF" accesskey="p" rel="prev">S/390 ELF</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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</body>
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</html>
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