frame.sp = gp.sched.sp
				u.cgoCtxt = len(gp.cgoCtxt) - 1
			case abi.FuncID_systemstack:
				// systemstack returns normally, so just follow the
				// stack transition.
				if usesLR && funcspdelta(f, frame.pc) == 0 {
					// We're at the function prologue and the stack
					// switch hasn't happened, or epilogue where we're
					// about to return. Just unwind normally.