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Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

This reverts commit 91e1fc11.

int3/debug raised from a kernel context should be passed to their
respective regular handler, which can cope with any domain context
(root/head).

However, the interrupt state should be fixed up only when those traps
are received from a user-space context.

With this change in place, there is no point in handling KGDB traps
ourselves, we can leave this to the regular handler.

This is a forward port of 07b11fb8 and b86e8cbe..277a6e00
from ipipe-3.14. See those commits for the reasons.

The only deviation here is the initialization of flags in case of
unhandled faults over the head domain. We now pick up the flags of the
faulting context instead of use 0 (interrupts off). This seems more
appropriate.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>