Fix mips64 ddb backtracing

[M. Warner Losh]

In message: <4BFE72B2.1030107 at gmail.com>
            Vladimir 'φ-coder/phcoder' Serbinenko <phcoder at gmail.com> writes:
: Rui Paulo wrote:
: > On 26 May 2010, at 23:27, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
: >
: >   
: >> This is a multi-part message in MIME format.
: >> --------------080906000803010207060400
: >> Content-Type: text/plain; charset=UTF-8
: >> Content-Transfer-Encoding: quoted-printable
: >>
: >> I've come accross this issue when coding for yeeloong. It's easy to fix
: >> (patch attached). After applying the patch I had the session with
: >> debugger as in attached capture file.
: >> Can this patch go directly to -current ?
: >>
: >> --=20
: >> Regards
: >> Vladimir '=CF=86-coder/phcoder' Serbinenko
: >>     
: >
: > Can you please resend this ? I cannot read this patch nor the pcap file correctly.
: >
: >   
: Some kind of problem with signatures. I'll bug-report it, using beta
: sometimes backfires.
: The original patch had a mistake (always using 64-bit kseg0 address) I
: fixed in this one. New cap file attached. Can some test it on 32-bit mips?

there's no cap file attached to this mail.

Warner