[deepzero]

makes sense, and since the file works for me but not for you the issue has to be in your setup...

Try

qemu-ppc -strace -D log.log -d guest_errors,int myprog

and see if you get any errors.
Or attach gdb

qemu-ppc -g 1234 myprog

And in another terminal: gdb -> target remote localhost:1234 -> continue