lkml.org 
[lkml]   [2019]   [Oct]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v3 13/17] arm64: preserve x18 when CPU is suspended
On Thu, Oct 31, 2019 at 10:27 AM Sami Tolvanen <samitolvanen@google.com> wrote:
>
> On Thu, Oct 31, 2019 at 10:18 AM Nick Desaulniers
> <ndesaulniers@google.com> wrote:
> > > +#ifdef CONFIG_SHADOW_CALL_STACK
> > > + ldr x18, [x0, #96]
> > > + str xzr, [x0, #96]
> >
> > How come we zero out x0+#96, but not for other offsets? Is this str necessary?
>
> It clears the shadow stack pointer from the sleep state buffer, which
> is not strictly speaking necessary, but leaves one fewer place to find
> it.

That sounds like a good idea. Consider adding comments or to the
commit message so that the str doesn't get removed accidentally in the
future.
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
--
Thanks,
~Nick Desaulniers

\
 
 \ /
  Last update: 2019-10-31 18:35    [W:1.561 / U:24.920 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site