> Conceivably, you could remap your virtual address space to have a stack and libraries within the 32-bit space, and then jump into x32-like code which translat

> Conceivably, you could remap your virtual address space to have a stack and libraries within the 32-bit space, and then jump into x32-like code which translated pointers to and from 64-bit for syscalls and kernel data structures. This would retain most of the benefits of x32 for CPU-bound processes. That's what I'm thinking about. You'd need a little cooperation from libc and the dynamic linker in order to have a good "user" experience, and I think you can even share 64-bit libs (provided they don't call mmap() themselves and return the pointer to your application), but these seem almost manageable.