Messages in this thread | | | Date | Mon, 25 May 2020 12:40:38 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC][PATCH 0/4] x86/entry: disallow #DB more |
| |
On Mon, May 25, 2020 at 12:02:48PM +0200, Rasmus Villemoes wrote:
> Naive question: did you check disassembly to see whether gcc threw your > native_get_debugreg() away, given that the asm isn't volatile and the > result is not used for anything? Testing here only shows a "mov > %r9,%db7", but the read did seem to get thrown away.
Argh.. no I did not. Writing it all in asm gets me:
[ 1.627405] XXX: 3900 8304 22632
which is a lot worse...
| |