SYSCALL/SYSRET is my favorite one, since it does not change ESP/RSP: http://web.archive.org/web/20120615223202/http://www.x86-64.org/pipermail/discuss/2000-Oct

SYSCALL/SYSRET is my favorite one, since it does not change ESP/RSP: http://web.archive.org/web/20120615223202/http://www.x86-64.org/pipermail/discuss/2000-October/001009.html http://web.archive.org/web/20120615223202/http://www.x86-64.... What is even worse is that I think Intel made the mistake of checking for canonical addresses and GP#ing on the SYSRET instruction itself.