Re: Can we drop upstream Linux x32 support?

On Wed, 12 Dec 2018, Arnd Bergmann wrote:

quoted

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
joseph@codesourcery.com