We added license-OK single-step code to gdb-4.16 way back.
Why not just merge that forward?  (mips and alpha)

Todd Vierling writes:
 > I've added a shockingly simple fix to gdb to enable shared object handling
 > on alpha, so gdb is more-or-less working on alpha (and pullups have been
 > submitted for 1.4).  There is still no single-step support, as there is an
 > issue with licensing for the CMU-contributed code to do such, but
 > breakpoints do work.
 > 
 > Now, as to the last known breakage (other than sparc64 or powerpc, which
 > aren't implemented at all):  what's up with mips, if anything?
 > 
 > -- 
 > -- Todd Vierling (Personal tv@pobox.com; Bus. todd_vierling@xn.xerox.com)
 >