This patch implements the set_initial_registers_tid hook for sparc.
It works in both sparcv9-*-* and sparc64-*-* targets.
Looks good. Pushed to master.
Not having access to a sparc setup I couldn't test this, but I assume
that with this run-backtrace-native.sh and run-backtrace-native-biarch.sh
now PASS on sparc64?
Yes. Both native and -m32 PASS on sparc64-*-*.