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Can push_dummy_call set these space registers, and the generic pop dummyframe code restore them?
No. Unfortunately it's not possible to use the regular ttrace mechanism to set the pcsqh/pcsqt (aka iasq[0] and iasq[1]) registers.... bascially you need to execute a bit of code:
(assuming pcoqh (aka pc) is in r21 and pcsqh is in r22) ldsid (%r22), %r1 mtsp %r1, %sr0 be 0(%sr0, %r21)
this branches to (%r22, %r21), thereby setting the space register ...
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