These are the ELF x86-64 psABI LaTeX sources including full history from the former subversion repository at svn.x86-64.org, which is gone now. For change please create pull requests after discussing them at the [email protected] mailing list (whose archives are at https://groups.google.com/forum/#!forum/x86-64-abi).
You need pdflatex for building these, then
% make pdf
should give you abi.pdf.
An old testsuite of some ABI traits, very old and imcomplete meanwhile, just here for its history.