> 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-*-*.