h.err = plainError(reason)
	ctxt.set_pc(ctxt.pc() + 4)
}

// case 16
func (h *debugCallHandler) restoreSigContext(ctxt *sigctxt) {
	// Restore all registers except for pc and sp
	pc, sp := ctxt.pc(), ctxt.sp()
	*ctxt.cregs() = h.sigCtxt.savedRegs
	ctxt.set_pc(pc + 4)
	ctxt.set_sp(sp)
}

// storeRegArgs sets up argument registers in the signal
// context state from an abi.RegArgs.
//

func (c *sigctxt) sigaddr() uint32 {
	return *(*uint32)(add(unsafe.Pointer(c.info), 16))
}

func (c *sigctxt) set_pc(x uint32)  { c.regs().sc_pc = x }
func (c *sigctxt) set_sp(x uint32)  { c.regs().sc_usr_sp = x }
func (c *sigctxt) set_lr(x uint32)  { c.regs().sc_usr_lr = x }
func (c *sigctxt) set_r10(x uint32) { c.regs().sc_r10 = x }

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

func (c *context) lr() uintptr { return uintptr(c.lrr) }

func (c *context) set_ip(x uintptr) { c.pc = uint32(x) }
func (c *context) set_sp(x uintptr) { c.spr = uint32(x) }
func (c *context) set_lr(x uintptr) { c.lrr = uint32(x) }

// arm does not have frame pointer register.
func (c *context) set_fp(x uintptr) {}

func prepareContextForSigResume(c *context) {
	c.r0 = c.spr
	c.r1 = c.pc
}

	// anyway.
	sp := c.sp() - sys.MinFrameSize
	c.set_sp(sp)
	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.link()

	pc := gp.sigpc

	if shouldPushSigpanic(gp, pc, uintptr(c.link())) {
		// Make it look the like faulting PC called sigpanic.
		c.set_link(uint64(pc))
	}

	// In case we are panicking from external C code
	c.set_r0(0)
	c.set_r30(uint64(uintptr(unsafe.Pointer(gp))))

func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
func (c *sigctxt) sigaddr() uint32 { return uint32(c.info.si_addr) }

func (c *sigctxt) set_pc(x uint32)  { c.regs().__gregs[15] = x }
func (c *sigctxt) set_sp(x uint32)  { c.regs().__gregs[13] = x }
func (c *sigctxt) set_lr(x uint32)  { c.regs().__gregs[14] = x }
func (c *sigctxt) set_r10(x uint32) { c.regs().__gregs[10] = x }

func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
func (c *sigctxt) sigaddr() uint32 { return c.info.si_addr }

func (c *sigctxt) set_pc(x uint32)  { c.regs().pc = x }
func (c *sigctxt) set_sp(x uint32)  { c.regs().sp = x }
func (c *sigctxt) set_lr(x uint32)  { c.regs().lr = x }
func (c *sigctxt) set_r10(x uint32) { c.regs().r10 = x }

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

// AMD64 does not have link register, so this returns 0.
func (c *context) lr() uintptr      { return 0 }
func (c *context) set_lr(x uintptr) {}

func (c *context) set_ip(x uintptr) { c.rip = uint64(x) }
func (c *context) set_sp(x uintptr) { c.rsp = uint64(x) }
func (c *context) set_fp(x uintptr) { c.rbp = uint64(x) }

func prepareContextForSigResume(c *context) {
	c.r8 = c.rsp
	c.r9 = c.rip
}

func (c *sigctxt) sigcode() uint32 { return uint32(c.info._code) }
func (c *sigctxt) sigaddr() uint32 { return uint32(c.info._reason) }

func (c *sigctxt) set_pc(x uint32)  { c.regs().__gregs[_REG_R15] = x }
func (c *sigctxt) set_sp(x uint32)  { c.regs().__gregs[_REG_R13] = x }
func (c *sigctxt) set_lr(x uint32)  { c.regs().__gregs[_REG_R14] = x }
func (c *sigctxt) set_r10(x uint32) { c.regs().__gregs[_REG_R10] = x }

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

func (c *sigctxt) set_pc(x uint64) { c.regs().sc_regs.pc = x }
func (c *sigctxt) set_ra(x uint64) { c.regs().sc_regs.ra = x }
func (c *sigctxt) set_sp(x uint64) { c.regs().sc_regs.sp = x }
func (c *sigctxt) set_gp(x uint64) { c.regs().sc_regs.gp = x }

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

func (c *context) sp() uintptr { return uintptr(c.xsp) }
func (c *context) lr() uintptr { return uintptr(c.x[30]) }

func (c *context) set_ip(x uintptr) { c.pc = uint64(x) }
func (c *context) set_sp(x uintptr) { c.xsp = uint64(x) }
func (c *context) set_lr(x uintptr) { c.x[30] = uint64(x) }
func (c *context) set_fp(x uintptr) { c.x[29] = uint64(x) }

func prepareContextForSigResume(c *context) {
	c.x[0] = c.xsp
	c.x[1] = c.pc
}