K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2018-05-16T06:52:08.182359Z
K 7
svn:log
V 845
followup to r332730/r332752: set kdb_why to "trap" for fatal traps

This change updates arm, arm64 and mips achitectures.  Additionally, it
removes redundant checks for kdb_active where it already results in
kdb_reenter() and adds kdb_reenter() calls where they were missing.

Some architectures check the return value of kdb_trap(), but some don't.
I haven't changed any of that.

Some trap handling routines have a return code.  I am not sure if I
provided correct ones for returns after kdb_reenter().  kdb_reenter
should never return unless kdb_jmpbufp is NULL for some reason.

Only compile tested for all affected architectures.  There can be bugs
resulting from my poor understanding of architecture specific details.

Reported by:	jhb
Reviewed by:	jhb, eadler
MFC after:	4 weeks
Differential Revision: https://reviews.freebsd.org/D15431

END