/* DSP56k pushes both PC and SR to the stack in the JSR instruction, but
* RTS discards SR while returning (it does not restore it). So we push
* 0 to fake the same context.
/* DSP56k pushes both PC and SR to the stack in the JSR instruction, but
* RTS discards SR while returning (it does not restore it). So we push
* 0 to fake the same context.