switch runtime.GOARCH {
	case "386", "amd64":
		ill = append(ill[:0], 0x89, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00) // MOVL AX, 0
	case "arm":
		binary.LittleEndian.PutUint32(ill[0:4], 0xe3a00000) // MOVW $0, R0
		binary.LittleEndian.PutUint32(ill[4:8], 0xe5800000) // MOVW R0, (R0)
	case "arm64":
		binary.LittleEndian.PutUint32(ill, 0xf90003ff) // MOVD ZR, (ZR)
	case "ppc64":
		binary.BigEndian.PutUint32(ill, 0xf8000000) // MOVD R0, (R0)

	tramp.SetSize(20)                               // 5 instructions
	o1 := uint32(0xe5900000 | 12<<12 | 15<<16 | 8)  // MOVW 8(R15), R12 // R15 is actual pc + 8
	o2 := uint32(0xe0800000 | 12<<12 | 15<<16 | 12) // ADD R15, R12, R12
	o3 := uint32(0xe5900000 | 12<<12 | 12<<16)      // MOVW (R12), R12
	o4 := uint32(0xe12fff10 | 12)                   // JMP  (R12)

	IPV6_PRIORITY_13              = 0xd000000
	IPV6_PRIORITY_14              = 0xe000000
	IPV6_PRIORITY_15              = 0xf000000
	IPV6_PRIORITY_8               = 0x8000000
	IPV6_PRIORITY_9               = 0x9000000
	IPV6_PRIORITY_BULK            = 0x4000000
	IPV6_PRIORITY_CONTROL         = 0x7000000
	IPV6_PRIORITY_FILLER          = 0x1000000
	IPV6_PRIORITY_INTERACTIVE     = 0x6000000
	IPV6_PRIORITY_RESERVED1       = 0x3000000

	0x1d700000, 0x1d700028, 0x1e100000, 0x1e100096,
	0x1e700000, 0x1e7000d7, 0x1ea00000, 0x1ea00053,
	// Entry 180 - 19F
	0x1f300000, 0x1f500000, 0x1f800000, 0x1f80009e,
	0x1f900000, 0x1f90004e, 0x1f90009f, 0x1f900114,
	0x1f900139, 0x1fa00000, 0x1fb00000, 0x20000000,
	0x200000a3, 0x20300000, 0x20700000, 0x20700052,
	0x20800000, 0x20a00000, 0x20a00130, 0x20e00000,
	0x20f00000, 0x21000000, 0x2100007e, 0x21200000,

	FlagRootSafe              uint32 = 0x40000
	FlagSetuidSafe            uint32 = 0x80000
	FlagNoReexportedDylibs    uint32 = 0x100000
	FlagPIE                   uint32 = 0x200000
	FlagDeadStrippableDylib   uint32 = 0x400000
	FlagHasTLVDescriptors     uint32 = 0x800000
	FlagNoHeapExecution       uint32 = 0x1000000
	FlagAppExtensionSafe      uint32 = 0x2000000
)

// A Section32 is a 32-bit Mach-O section header.

			ctxt.Diag("final stage: pc invalid: %v size=%d", p, m)
		}

		if int64(pc) > p.Pc {
			ctxt.Diag("PC padding invalid: want %#d, has %#d: %v", p.Pc, pc, p)
		}
		for int64(pc) != p.Pc {
			// emit 0xe1a00000 (MOVW R0, R0)
			bp[0] = 0x00
			bp = bp[1:]

			bp[0] = 0x00
			bp = bp[1:]
			bp[0] = 0xa0
			bp = bp[1:]
			bp[0] = 0xe1
			bp = bp[1:]
			pc += 4
		}

	_EV_DISABLE   = 0x8
	_EV_CLEAR     = 0x20
	_EV_RECEIPT   = 0x40
	_EV_ERROR     = 0x4000
	_EV_EOF       = 0x8000
	_EVFILT_READ  = -0x1
	_EVFILT_WRITE = -0x2
	_EVFILT_USER  = -0xb

	_NOTE_TRIGGER = 0x1000000
)

type rtprio struct {
	_type uint16
	prio  uint16
}

type thrparam struct {
	start_func uintptr
	arg        unsafe.Pointer
	stack_base uintptr
	stack_size uintptr

	_EV_DISABLE   = 0x8
	_EV_CLEAR     = 0x20
	_EV_RECEIPT   = 0x40
	_EV_ERROR     = 0x4000
	_EV_EOF       = 0x8000
	_EVFILT_READ  = -0x1
	_EVFILT_WRITE = -0x2
	_EVFILT_USER  = -0xb

	_NOTE_TRIGGER = 0x1000000
)

type rtprio struct {
	_type uint16
	prio  uint16
}

type thrparam struct {
	start_func uintptr
	arg        unsafe.Pointer
	stack_base uintptr
	stack_size uintptr

	ATTR_CMN_GRPID                          = 0x10000
	ATTR_CMN_GRPUUID                        = 0x1000000
	ATTR_CMN_MODTIME                        = 0x400
	ATTR_CMN_NAME                           = 0x1
	ATTR_CMN_NAMEDATTRCOUNT                 = 0x80000
	ATTR_CMN_NAMEDATTRLIST                  = 0x100000
	ATTR_CMN_OBJID                          = 0x20
	ATTR_CMN_OBJPERMANENTID                 = 0x40

	MS_REMOUNT                       = 0x20
	MS_RMT_MASK                      = 0x2800051
	MS_SHARED                        = 0x100000
	MS_SILENT                        = 0x8000
	MS_SLAVE                         = 0x80000
	MS_STRICTATIME                   = 0x1000000
	MS_SYNC                          = 0x4
	MS_SYNCHRONOUS                   = 0x10
	MS_UNBINDABLE                    = 0x20000