port-mac68k/39388: NetBSD/mac68k DDB uselessness

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>Number:         39388
>Category:       port-mac68k
>Synopsis:       NetBSD/mac68k DDB uselessness
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-mac68k-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 20 15:15:00 +0000 2008
>Originator:     Ed
>Release:        NetBSD/mac68k 4.99.72
>Organization:
None
>Environment:
Apple Macintosh Centris 660AV
>Description:
DDB has some rather serious faults on NetBSD/mac68k.

1. Within the debugger, the backtrace is completely useless. All it shows is 
"cpu_debugger" and nothing prior.

2. Upon attempting to exit the debugger by issuing a continue command, the 
debugger _will_ exit, but upon pressing enter twice to attempt to retrieve the 
shell prompt, the system will promptly panic with an Illegal Instruction trap 
within the kernel.
>How-To-Repeat:

>Fix: