I don't know of any online reference to the "generic" ELF ABI, but
the implementation on powerpc can be found at:
The former reference is a postscript draft dated July 25, 1994.
The later is in PDF format and looks to be a final version dated
September 1995. It is also page reversed.
Other useful stuff may be found in
Note that some of these are in postscript format. Use the ghostscript
rpm (also on the same site) to read them on-screen, or print them
to an appropriate printer.
[ Nick ]