NetBSD/lib/libpthread
rin e3331ab957 libpthread sets initial value of MSR for lwp's. However, appropriate
value differs b/w oea/booke/ibm4xx, and there's no way to obtain it
from userland. Therefore, this initial value should be corrected by
cpu_setmcontext().

- Comment this in libpthread
- Add KASSERT in cpu_mcontext_validate()
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$NetBSD: README,v 1.7 2017/02/08 03:44:41 kamil Exp $

Due to limitations in the current pthread implementation, makecontext(3)
and sigaltstack(2) should not be used in programs which link against
libpthread (whether threads are used or not). This has been noted in the
makecontext(3), sigaltstack(2), and pthread(3) man pages.