Over past few days I've made some commits that bring pthreads support
on sh3 into a much better shape.  Only two regression tests in the
tree fails.  From a quick look:

src/regress/lib/libpthread/sem
    wanders into NOTREACHED code in _setcontext_u() after calling
    setcontext(2).

src/regress/lib/libpthread/sigalarm
    performs unaligned access in pthread__signal_tramp()

SY, Uwe
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