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The mmo object format is used exclusively together with Professor
Donald E. Knuth’s educational 64-bit processor MMIX.  The simulator
mmix which is available at
http://mmix.cs.hm.edu/src/index.html
understands this format.  That package also includes a combined
assembler and linker called mmixal.  The mmo format has
no advantages feature-wise compared to e.g. ELF.  It is a simple
non-relocatable object format with no support for archives or
debugging information, except for symbol value information and
line numbers (which is not yet implemented in BFD).  See
http://mmix.cs.hm.edu/ for more
information about MMIX.  The ELF format is used for intermediate
object files in the BFD implementation.
| • File layout: | ||
| • Symbol-table: | ||
| • mmo section mapping: |