tv_sec  int64
	tv_nsec int64
}

//go:nosplit
func (ts *timespec) setNsec(ns int64) {
	ts.tv_sec = ns / 1e9
	ts.tv_nsec = ns % 1e9
}

type exceptionstate64 struct {
	far uint64 // virtual fault addr
	esr uint32 // exception syndrome
	exc uint32 // number of arm exception taken
}

type regs64 struct {
	x     [29]uint64 // registers x0 to x28
	fp    uint64     // frame register, x29

//go:nosplit
//go:nowritebarrierrec
func (c *sigctxt) pc() uint64 { return c.regs().pc }

func (c *sigctxt) pstate() uint64 { return c.regs().pstate }
func (c *sigctxt) fault() uintptr { return uintptr(c.regs().fault_address) }

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

//go:nowritebarrierrec
func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }

func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
func (c *sigctxt) siglr() uintptr { return uintptr(c.ra()) }
func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }

// preparePanic sets up the stack to look like a call to sigpanic.
func (c *sigctxt) preparePanic(sig uint32, gp *g) {
	// We arrange RA, and pc to pretend the panicking

}

func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }

// preparePanic sets up the stack to look like a call to sigpanic.
func (c *sigctxt) preparePanic(sig uint32, gp *g) {
	// We arrange link, and pc to pretend the panicking

func (c *sigctxt) sp() uint64  { return c.regs().__gregs[_REG_X31] }

//go:nosplit
//go:nowritebarrierrec
func (c *sigctxt) pc() uint64 { return c.regs().__gregs[_REG_ELR] }

func (c *sigctxt) fault() uintptr  { return uintptr(c.info._reason) }
func (c *sigctxt) trap() uint64    { return 0 }
func (c *sigctxt) error() uint64   { return 0 }
func (c *sigctxt) oldmask() uint64 { return 0 }

func (c *sigctxt) sp() uint64  { return c.regs().mc_gpregs.gp_sp }

//go:nosplit
//go:nowritebarrierrec
func (c *sigctxt) pc() uint64 { return c.regs().mc_gpregs.gp_elr }

func (c *sigctxt) fault() uintptr { return uintptr(c.info.si_addr) }

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

func (c *sigctxt) sp() uint64  { return (uint64)(c.regs().sc_sp) }

//go:nosplit
//go:nowritebarrierrec
func (c *sigctxt) rip() uint64 { return (uint64)(c.regs().sc_lr) } /* XXX */

func (c *sigctxt) fault() uintptr  { return uintptr(c.sigaddr()) }
func (c *sigctxt) sigcode() uint64 { return uint64(c.info.si_code) }
func (c *sigctxt) sigaddr() uint64 {
	return *(*uint64)(add(unsafe.Pointer(c.info), 16))
}

//go:nosplit

//go:nowritebarrierrec
func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }

func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }

// preparePanic sets up the stack to look like a call to sigpanic.
func (c *sigctxt) preparePanic(sig uint32, gp *g) {
	// We arrange link, and pc to pretend the panicking

	}
}

func main() {
	flag.Parse()

	enableCore()

	C.trigger_crash()
}
`

// TestGdbCoreCrashThreadBacktrace tests that runtime could let the fault thread to crash process
// and make fault thread as number one thread while gdb in a core file
func TestGdbCoreCrashThreadBacktrace(t *testing.T) {
	if runtime.GOOS != "linux" {
		// N.B. This test isn't fundamentally Linux-only, but it needs

func (c *sigctxt) trap() uint32 { return 0x0 }

func (c *sigctxt) sigcode() uint32 { return uint32(c.info.si_code) }
func (c *sigctxt) sigaddr() uint64 { return uint64(c.info.si_addr) }
func (c *sigctxt) fault() uintptr  { return uintptr(c.sigaddr()) }

func (c *sigctxt) set_r0(x uint64)   { c.regs().gpr[0] = x }
func (c *sigctxt) set_r12(x uint64)  { c.regs().gpr[12] = x }
func (c *sigctxt) set_r30(x uint64)  { c.regs().gpr[30] = x }