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100 lines
4.2 KiB
HTML
100 lines
4.2 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>MMIX (LD)</title>
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<meta name="description" content="MMIX (LD)">
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<meta name="keywords" content="MMIX (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="MSP430.html#MSP430" rel="next" title="MSP430">
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<link href="MIPS.html#MIPS" rel="prev" title="MIPS">
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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.smallexample {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="MMIX"></a>
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<div class="header">
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<p>
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Next: <a href="MSP430.html#MSP430" accesskey="n" rel="next">MSP430</a>, Previous: <a href="MIPS.html#MIPS" accesskey="p" rel="prev">MIPS</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-MMIX"></a>
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<h3 class="section">4.7 <code>ld</code> and MMIX</h3>
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<p>For MMIX, there is a choice of generating <code>ELF</code> object files or
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<code>mmo</code> object files when linking. The simulator <code>mmix</code>
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understands the <code>mmo</code> format. The binutils <code>objcopy</code> utility
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can translate between the two formats.
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</p>
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<p>There is one special section, the ‘<samp>.MMIX.reg_contents</samp>’ section.
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Contents in this section is assumed to correspond to that of global
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registers, and symbols referring to it are translated to special symbols,
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equal to registers. In a final link, the start address of the
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‘<samp>.MMIX.reg_contents</samp>’ section corresponds to the first allocated
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global register multiplied by 8. Register <code>$255</code> is not included in
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this section; it is always set to the program entry, which is at the
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symbol <code>Main</code> for <code>mmo</code> files.
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</p>
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<p>Global symbols with the prefix <code>__.MMIX.start.</code>, for example
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<code>__.MMIX.start..text</code> and <code>__.MMIX.start..data</code> are special.
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The default linker script uses these to set the default start address
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of a section.
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</p>
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<p>Initial and trailing multiples of zero-valued 32-bit words in a section,
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are left out from an mmo file.
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</p>
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</body>
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</html>
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