Re: [PATCH v1] m68k: save extra registers on sys_exit and sys_exit_group syscall entry

Linus Torvalds
2021-06-13T20:26:46Z

On Sun, Jun 13, 2021 at 1:07 PM Michael Schmitz <schmitzmic@gmail.com> wrote:
>
> I'd love that, too. My test rig doesn't allow dumping of registers by
> strace, but someone else may have that capacity.

I think doing it manually with gdb should be fairly straightforward.

Something like

gdb /bin/true

and then in gdb you just do

b main
run

and then

catch syscall group:process
c

and it should stop at the exit_group or exit system call.

At that point you can just do

info registers

and see if they match what user space *should* be. They'll probably be
complete garbage without the fix.

I do not have an alpha or m68k machine to test (and not the
energy/inclination to set up some virtual environment in qemu either).
But it should be easy if you already have that environment.

Linus