* H. J. Lu: >> Actually, I'm wondering if you can do the translation in user space. >> There already are 32-on-64 implementations in existence, without >> kernel changes (recent Hotspot, LuaJIT, and probably some more). > > Please check out the x32 kernel source and provide feedback.
I still don't understand why you need a separate syscall table. You should really be able to run on an unmodified amd64 kernel, in 64 bit mode. This would imply that tools like strace don't need any porting at all (you could just use the amd64 version), and even GDB would mostly worked unchanged.
