Re: Can we drop upstream Linux x32 support?

From: Joseph Myers
Date: Wed Dec 12 2018 - 13:14:23 EST

On Wed, 12 Dec 2018, Arnd Bergmann wrote:

> > MIPS had o32, n32, n64 since like forever.
> o32 and n32 are practically the same, the only difference on the
> syscall ABI that I can see are the actual syscall numbers, and
> the 'struct sigcontext' definition.

And for syscalls that have 64-bit arguments, n32 generally passes those in
a single register (like n64), not pairs of registers (like o32). But,
yes, userspace structure layout for n32 is generally much closer to o32
than to n64.

Joseph S. Myers