ctxt.set_lr(ctxt.pc() + 4)
	// Set PC to call and context register.
	ctxt.set_pc(uint64(h.fv.fn))
	sigctxtSetContextRegister(ctxt, uint64(uintptr(unsafe.Pointer(h.fv))))
}

// case 1
func (h *debugCallHandler) debugCallReturn(ctxt *sigctxt) {
	sp := ctxt.sp()
	memmove(h.argp, unsafe.Pointer(uintptr(sp)+8), h.argSize)
	if h.regArgs != nil {
		loadRegArgs(h.regArgs, ctxt.regs())
	}
	// Restore the old lr from *sp

	ctxt.set_link(ctxt.pc() + 4)
	// Set PC to call and context register.
	ctxt.set_pc(uint64(h.fv.fn))
	sigctxtSetContextRegister(ctxt, uint64(uintptr(unsafe.Pointer(h.fv))))
}

// case 1
func (h *debugCallHandler) debugCallReturn(ctxt *sigctxt) {
	sp := ctxt.sp()
	memmove(h.argp, unsafe.Pointer(uintptr(sp)+32), h.argSize)
	if h.regArgs != nil {
		loadRegArgs(h.regArgs, ctxt.cregs())
	}
	// Restore the old lr from *sp

	case 0:
		// Frame is ready. Copy the arguments to the frame and to registers.
		// Call the debug function.
		h.debugCallRun(ctxt)
	case 1:
		// Function returned. Copy frame and result registers back out.
		h.debugCallReturn(ctxt)
	case 2:
		// Function panicked. Copy panic out.
		h.debugCallPanicOut(ctxt)
	case 8:
		// Call isn't safe. Get the reason.
		h.debugCallUnsafe(ctxt)

	// Set PC to call and context register.
	ctxt.set_rip(uint64(h.fv.fn))
	sigctxtSetContextRegister(ctxt, uint64(uintptr(unsafe.Pointer(h.fv))))
}

// case 1
func (h *debugCallHandler) debugCallReturn(ctxt *sigctxt) {
	rsp := ctxt.rsp()
	memmove(h.argp, unsafe.Pointer(uintptr(rsp)), h.argSize)
	if h.regArgs != nil {
		loadRegArgs(h.regArgs, ctxt.regs())
	}
}

// case 2