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74 lines
3.2 KiB
HTML
74 lines
3.2 KiB
HTML
<html lang="en">
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<head>
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<title>MMIX - Untitled</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Untitled">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Machine-Dependent.html#Machine-Dependent" title="Machine Dependent">
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<link rel="prev" href="MIPS.html#MIPS" title="MIPS">
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<link rel="next" href="MSP430.html#MSP430" title="MSP430">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU linker LD
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(GNU Binutils)
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version 2.26.
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Copyright (C) 1991-2015 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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<meta http-equiv="Content-Style-Type" content="text/css">
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<style type="text/css"><!--
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pre.display { font-family:inherit }
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pre.format { font-family:inherit }
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pre.smalldisplay { font-family:inherit; font-size:smaller }
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pre.smallformat { font-family:inherit; font-size:smaller }
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span.sansserif { font-family:sans-serif; font-weight:normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="MMIX"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="MSP430.html#MSP430">MSP430</a>,
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Previous: <a rel="previous" accesskey="p" href="MIPS.html#MIPS">MIPS</a>,
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Up: <a rel="up" accesskey="u" href="Machine-Dependent.html#Machine-Dependent">Machine Dependent</a>
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<hr>
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</div>
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<h3 class="section">4.8 <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>There is one special section, the ‘<samp><span class="samp">.MMIX.reg_contents</span></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><span class="samp">.MMIX.reg_contents</span></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>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>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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</body></html>
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