1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<!-- This file documents the GNU linker LD 4(GNU Toolchain for the A-profile Architecture 10.3-2021.07 (arm-10.29)) 5version 2.36.1. 6 7Copyright (C) 1991-2021 Free Software Foundation, Inc. 8 9Permission is granted to copy, distribute and/or modify this document 10under the terms of the GNU Free Documentation License, Version 1.3 11or any later version published by the Free Software Foundation; 12with no Invariant Sections, with no Front-Cover Texts, and with no 13Back-Cover Texts. A copy of the license is included in the 14section entitled "GNU Free Documentation License". --> 15<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> 16<head> 17<title>LD: MMIX</title> 18 19<meta name="description" content="LD: MMIX"> 20<meta name="keywords" content="LD: MMIX"> 21<meta name="resource-type" content="document"> 22<meta name="distribution" content="global"> 23<meta name="Generator" content="makeinfo"> 24<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 25<link href="index.html#Top" rel="start" title="Top"> 26<link href="LD-Index.html#LD-Index" rel="index" title="LD Index"> 27<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> 28<link href="Machine-Dependent.html#Machine-Dependent" rel="up" title="Machine Dependent"> 29<link href="MSP430.html#MSP430" rel="next" title="MSP430"> 30<link href="MIPS.html#MIPS" rel="previous" title="MIPS"> 31<style type="text/css"> 32<!-- 33a.summary-letter {text-decoration: none} 34blockquote.smallquotation {font-size: smaller} 35div.display {margin-left: 3.2em} 36div.example {margin-left: 3.2em} 37div.indentedblock {margin-left: 3.2em} 38div.lisp {margin-left: 3.2em} 39div.smalldisplay {margin-left: 3.2em} 40div.smallexample {margin-left: 3.2em} 41div.smallindentedblock {margin-left: 3.2em; font-size: smaller} 42div.smalllisp {margin-left: 3.2em} 43kbd {font-style:oblique} 44pre.display {font-family: inherit} 45pre.format {font-family: inherit} 46pre.menu-comment {font-family: serif} 47pre.menu-preformatted {font-family: serif} 48pre.smalldisplay {font-family: inherit; font-size: smaller} 49pre.smallexample {font-size: smaller} 50pre.smallformat {font-family: inherit; font-size: smaller} 51pre.smalllisp {font-size: smaller} 52span.nocodebreak {white-space:nowrap} 53span.nolinebreak {white-space:nowrap} 54span.roman {font-family:serif; font-weight:normal} 55span.sansserif {font-family:sans-serif; font-weight:normal} 56ul.no-bullet {list-style: none} 57--> 58</style> 59 60 61</head> 62 63<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> 64<a name="MMIX"></a> 65<div class="header"> 66<p> 67Next: <a href="MSP430.html#MSP430" accesskey="n" rel="next">MSP430</a>, Previous: <a href="MIPS.html#MIPS" accesskey="p" rel="previous">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> 68</div> 69<hr> 70<a name="ld-and-MMIX"></a> 71<h3 class="section">5.7 <code>ld</code> and MMIX</h3> 72<p>For MMIX, there is a choice of generating <code>ELF</code> object files or 73<code>mmo</code> object files when linking. The simulator <code>mmix</code> 74understands the <code>mmo</code> format. The binutils <code>objcopy</code> utility 75can translate between the two formats. 76</p> 77<p>There is one special section, the ‘<samp>.MMIX.reg_contents</samp>’ section. 78Contents in this section is assumed to correspond to that of global 79registers, and symbols referring to it are translated to special symbols, 80equal to registers. In a final link, the start address of the 81‘<samp>.MMIX.reg_contents</samp>’ section corresponds to the first allocated 82global register multiplied by 8. Register <code>$255</code> is not included in 83this section; it is always set to the program entry, which is at the 84symbol <code>Main</code> for <code>mmo</code> files. 85</p> 86<p>Global symbols with the prefix <code>__.MMIX.start.</code>, for example 87<code>__.MMIX.start..text</code> and <code>__.MMIX.start..data</code> are special. 88The default linker script uses these to set the default start address 89of a section. 90</p> 91<p>Initial and trailing multiples of zero-valued 32-bit words in a section, 92are left out from an mmo file. 93</p> 94 95 96 97 98 99</body> 100</html> 101