Messages in this thread | | | Date | Wed, 7 May 2014 11:17:09 +0100 | From | Will Deacon <> | Subject | Re: [PATCH v2 2/2] arm64: enable context tracking |
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On Wed, May 07, 2014 at 12:32:29AM +0100, Larry Bassel wrote: > Make calls to ct_user_enter when the kernel is exited > and ct_user_exit when the kernel is entered (in el0_da, > el0_ia, el0_svc, el0_irq).
Why only these entry points? I can reschedule after any exception from EL0, so I'd expect all exceptions from userspace to need annotating, no?
> These macros expand to function calls which will only work > properly if el0_sync and related code has been rearranged > (in a previous patch of this series). > > In order to avoid saving registers, the slow syscall path > is forced (as x86 does).
... and if you decide to handle undef exceptions, I think you'll need the register saving too, in case the kernel needs to perform emulation.
Will
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