sc_rbp      uint64
	sc_rbx      uint64
	sc_rax      uint64
	sc_gs       uint64
	sc_fs       uint64
	sc_es       uint64
	sc_ds       uint64
	sc_trapno   uint64
	sc_err      uint64
	sc_rip      uint64
	sc_cs       uint64
	sc_rflags   uint64
	sc_rsp      uint64
	sc_ss       uint64
	sc_fpstate  unsafe.Pointer
	__sc_unused int32
	sc_mask     int32
}

type siginfo struct {

func (c *sigctxt) sigaddr() uint64 { return c.info.si_addr }

func (c *sigctxt) set_pc(x uint64)  { c.regs().mc_gpregs.gp_elr = x }
func (c *sigctxt) set_sp(x uint64)  { c.regs().mc_gpregs.gp_sp = x }
func (c *sigctxt) set_lr(x uint64)  { c.regs().mc_gpregs.gp_lr = x }
func (c *sigctxt) set_r28(x uint64) { c.regs().mc_gpregs.gp_x[28] = x }

func (c *sigctxt) set_sigcode(x uint64) { c.info.si_code = int32(x) }

func (c *sigctxt) pc() uint64 { return uint64(c.regs().sc_elr) }

func (c *sigctxt) set_pc(x uint64)  { c.regs().sc_elr = uintptr(x) }
func (c *sigctxt) set_sp(x uint64)  { c.regs().sc_sp = uintptr(x) }
func (c *sigctxt) set_lr(x uint64)  { c.regs().sc_lr = uintptr(x) }
func (c *sigctxt) set_r28(x uint64) { c.regs().sc_x[28] = uintptr(x) }

func (c *sigctxt) set_sigcode(x uint64) { c.info.si_code = int32(x) }
func (c *sigctxt) set_sigaddr(x uint64) {

	return *(*uint64)(add(unsafe.Pointer(c.info), 2*goarch.PtrSize))
}

func (c *sigctxt) set_pc(x uint64) { c.regs().sc_sepc = uintptr(x) }
func (c *sigctxt) set_ra(x uint64) { c.regs().sc_ra = uintptr(x) }
func (c *sigctxt) set_sp(x uint64) { c.regs().sc_sp = uintptr(x) }
func (c *sigctxt) set_gp(x uint64) { c.regs().sc_gp = uintptr(x) }

func (c *sigctxt) set_sigcode(x uint32) { c.info.si_code = int32(x) }
func (c *sigctxt) set_sigaddr(x uint64) {

	writeFD = uintptr(open(&writePath[0], 0x1 /* O_WRONLY */, 0))
	if writeFD == 0 {
		// It is hard to do anything here. Write to stderr just
		// in case user has root on device and has run
		//	adb shell setprop log.redirect-stdio true
		msg := []byte("runtime: cannot open /dev/log/main\x00")
		write(2, unsafe.Pointer(&msg[0]), int32(len(msg)))
		exit(2)
	}

	// Prepopulate the invariant header part.