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<h3 class="section">4.8 <code>ld</code> and MMIX</h3>
<p>For MMIX, there is a choice of generating <code>ELF</code> object files or
<code>mmo</code> object files when linking. The simulator <code>mmix</code>
understands the <code>mmo</code> format. The binutils <code>objcopy</code> utility
can translate between the two formats.
<p>There is one special section, the ‘<samp><span class="samp">.MMIX.reg_contents</span></samp>’ section.
Contents in this section is assumed to correspond to that of global
registers, and symbols referring to it are translated to special symbols,
equal to registers. In a final link, the start address of the
‘<samp><span class="samp">.MMIX.reg_contents</span></samp>’ section corresponds to the first allocated
global register multiplied by 8. Register <code>$255</code> is not included in
this section; it is always set to the program entry, which is at the
symbol <code>Main</code> for <code>mmo</code> files.
<p>Global symbols with the prefix <code>__.MMIX.start.</code>, for example
<code>__.MMIX.start..text</code> and <code>__.MMIX.start..data</code> are special.
The default linker script uses these to set the default start address
of a section.
<p>Initial and trailing multiples of zero-valued 32-bit words in a section,
are left out from an mmo file.
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