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SubjectRe: [PATCH] Powerpc/Watchpoint: Restore nvgprs while returning from exception

On 6/6/19 12:59 PM, Ravi Bangoria wrote:
> Powerpc hw triggers watchpoint before executing the instruction.
> To make trigger-after-execute behavior, kernel emulates the
> instruction. If the instruction is 'load something into non-
> volatile register', exception handler should restore emulated
> register state while returning back, otherwise there will be
> register state corruption. Ex, Adding a watchpoint on a list
> can corrput the list:
> # cat /proc/kallsyms | grep kthread_create_list
> c00000000121c8b8 d kthread_create_list
> Add watchpoint on kthread_create_list->next:


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