Re: arm64: Register modification during syscall entry/exit stop
From: Dave Martin
Date: Mon Jun 01 2020 - 05:14:48 EST
On Sun, May 31, 2020 at 12:13:18PM -0400, Keno Fischer wrote:
> > Keno -- are you planning to send out a patch? You previously spoke about
> > implementing this using PTRACE_SETOPTIONS.
>
> Yes, I'll have a patch for you. Though I've come to the conclusion
> that introducing a new regset is probably a better way to solve it.
> We can then also expose orig_x0 at the same time and give it sane semantics
> (there's some problems with the way it works currently - I'll write it up
> together with the patch).
I'd worry that having a new ptrace option would be useless bug-
compatibility that is just going to bitrot.
Can you explain why userspace would write a changed value for x7
but at the same time need that new to be thrown away?
That sounds like a nonsensical thing for userspace to be doing.
Cheers
---Dave