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 10:18 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.

Sami

\
 
 \ /
  Last update: 2019-10-31 18:28    [W:0.202 / U:3.344 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site