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If we enter debug state from EL0, some registers are not accessible. Temporarily move to EL1H and back to gain access. Also, fix armv8_dpm_modeswitch() to not immediately restore the previous state on elevating the privilege level. Change-Id: Ic2a92109230ff4eb6834c00ef544397a5b7ad56a Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com> Reviewed-on: http://openocd.zylin.com/4461 Tested-by: jenkins Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>