Re: how to tell if a process is 64-bit

[Eduardo Horvath <eeh%NetBSD.org@localhost>]

On Fri, 8 Sep 2017, Mouse wrote:

> >> ([...] on most "64-bit" ports, a real question on amd64 (and others,
> >> if any) which support 32-bit userland.)
> > actually -- our mips64 ports largely use N32 userland, which is 64
> > bit registers and 32 bit addresses.
> 
> Oh!  Thank you.  Yes, that's an interesting case.
> 
> In addition to amd64/i386, it occurs to me that sparc64/sparc32 is
> another case; IIRC it's possible to take sparc64 hardware and build a
> (special? not sure) kernel that runs sparc32 userland.  I've never
> tried it; I don't know whether sparc32 and sparc64 are as freely
> mixable at runtime as amd64 and i386 are under amd64 kernels.

Yes, that's what compat/netbsd32 is for.  (Of course, there are still a 
few things like mount I never bothered to get working across ABIs.)

Eduardo