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| <h3 class="section">4.7 <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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