104 lines
4.6 KiB
HTML
104 lines
4.6 KiB
HTML
<!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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(Linaro_Binutils-2017.02)
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version 2.27.0.
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Copyright (C) 1991-2016 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 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>LD: Nios II</title>
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<meta name="description" content="LD: Nios II">
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<meta name="keywords" content="LD: Nios II">
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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="PowerPC-ELF32.html#PowerPC-ELF32" rel="next" title="PowerPC ELF32">
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<link href="NDS32.html#NDS32" rel="prev" title="NDS32">
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Nios-II"></a>
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<div class="header">
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<p>
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Next: <a href="PowerPC-ELF32.html#PowerPC-ELF32" accesskey="n" rel="next">PowerPC ELF32</a>, Previous: <a href="NDS32.html#NDS32" accesskey="p" rel="prev">NDS32</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-the-Altera-Nios-II"></a>
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<h3 class="section">4.11 <code>ld</code> and the Altera Nios II</h3>
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<a name="index-Nios-II-call-relaxation"></a>
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<a name="index-_002d_002drelax-on-Nios-II"></a>
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<p>Call and immediate jump instructions on Nios II processors are limited to
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transferring control to addresses in the same 256MB memory segment,
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which may result in <code>ld</code> giving
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‘<samp>relocation truncated to fit</samp>’ errors with very large programs.
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The command-line option <samp>--relax</samp> enables the generation of
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trampolines that can access the entire 32-bit address space for calls
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outside the normal <code>call</code> and <code>jmpi</code> address range. These
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trampolines are inserted at section boundaries, so may not themselves
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be reachable if an input section and its associated call trampolines are
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larger than 256MB.
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</p>
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<p>The <samp>--relax</samp> option is enabled by default unless <samp>-r</samp>
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is also specified. You can disable trampoline generation by using the
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<samp>--no-relax</samp> linker option. You can also disable this optimization
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locally by using the ‘<samp>set .noat</samp>’ directive in assembly-language
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source files, as the linker-inserted trampolines use the <code>at</code>
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register as a temporary.
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</p>
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<p>Note that the linker <samp>--relax</samp> option is independent of assembler
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relaxation options, and that using the GNU assembler’s <samp>-relax-all</samp>
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option interferes with the linker’s more selective call instruction relaxation.
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</p>
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</body>
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</html>
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