func OPDP3(sf uint32, op54 uint32, op31 uint32, o0 uint32) uint32 {
	return sf<<31 | op54<<29 | 0x1B<<24 | op31<<21 | o0<<15
}

func OPBcc(x uint32) uint32 {
	return 0x2A<<25 | 0<<24 | 0<<4 | x&15
}

func OPBLR(x uint32) uint32 {
	/* x=0, JMP; 1, CALL; 2, RET */
	return 0x6B<<25 | 0<<23 | x<<21 | 0x1F<<16 | 0<<10
}

func SYSOP(l uint32, op0 uint32, op1 uint32, crn uint32, crm uint32, op2 uint32, rt uint32) uint32 {

type LoaderHeader32 struct {
	Lversion uint32 // Loader section version number
	Lnsyms   uint32 // Number of symbol table entries
	Lnreloc  uint32 // Number of relocation table entries
	Listlen  uint32 // Length of import file ID string table
	Lnimpid  uint32 // Number of import file IDs
	Limpoff  uint32 // Offset to start of import file IDs
	Lstlen   uint32 // Length of string table
	Lstoff   uint32 // Offset to start of string table
}

pkg syscall (freebsd-386), func Mknod(string, uint32, int) error
pkg syscall (freebsd-386), type Dirent struct, Fileno uint32
pkg syscall (freebsd-386), type Dirent struct, Namlen uint8
pkg syscall (freebsd-386), type Stat_t struct, Blksize uint32
pkg syscall (freebsd-386), type Stat_t struct, Dev uint32
pkg syscall (freebsd-386), type Stat_t struct, Gen uint32
pkg syscall (freebsd-386), type Stat_t struct, Ino uint32

	AMOORW	A1, (A0), ZERO
	RET

// func And(ptr *uint32, val uint32)
TEXT ·And(SB), NOSPLIT, $0-12
	MOV	ptr+0(FP), A0
	MOVW	val+8(FP), A1
	AMOANDW	A1, (A0), ZERO
	RET

// func Or(ptr *uint32, val uint32)
TEXT ·Or(SB), NOSPLIT, $0-12
	MOV	ptr+0(FP), A0
	MOVW	val+8(FP), A1
	AMOORW	A1, (A0), ZERO
	RET

// func Or32(ptr *uint32, val uint32) uint32
TEXT ·Or32(SB), NOSPLIT, $0-20
	MOV	ptr+0(FP), A0

	ANDB	BX, (AX)
	RET

// func Or(addr *uint32, v uint32)
TEXT ·Or(SB), NOSPLIT, $0-12
	MOVQ	ptr+0(FP), AX
	MOVL	val+8(FP), BX
	LOCK
	ORL	BX, (AX)
	RET

// func And(addr *uint32, v uint32)
TEXT ·And(SB), NOSPLIT, $0-12
	MOVQ	ptr+0(FP), AX
	MOVL	val+8(FP), BX
	LOCK
	ANDL	BX, (AX)
	RET

// func Or32(addr *uint32, v uint32) old uint32
TEXT ·Or32(SB), NOSPLIT, $0-20
	MOVQ	ptr+0(FP), BX

// Uint32 returns a pseudo-random 32-bit value as a uint32.
func (r *Rand) Uint32() uint32 { return uint32(r.src.Uint64() >> 32) }

// Uint64 returns a pseudo-random 64-bit value as a uint64.
func (r *Rand) Uint64() uint64 { return r.src.Uint64() }

// Int32 returns a non-negative pseudo-random 31-bit integer as an int32.
func (r *Rand) Int32() int32 { return int32(r.src.Uint64() >> 33) }

		r:     r,
		data:  data,
		off:   uint32(off),
		start: uint32(start),
		bits:  uint32(streamStart),
		cnt:   uint32(7 - bits.LeadingZeros8(streamStart)),
	}
	return rbr, nil
}

// val is called to fetch a value of b bits.
func (rbr *reverseBitReader) val(b uint8) (uint32, error) {
	if !rbr.fetch(b) {
		return 0, rbr.r.makeEOFError(int(rbr.off))
	}

	rbr.cnt -= uint32(b)

// Returns the extra offset of a match token.
func (t token) offset() uint32 { return uint32(t) & offsetMask }

func (t token) length() uint32 { return uint32((t - matchType) >> lengthShift) }

func lengthCode(len uint32) uint32 { return lengthCodes[len] }

// Returns the offset code corresponding to a specific offset.
func offsetCode(off uint32) uint32 {

	tid1       unsafe.Pointer // *int32
	tid2       unsafe.Pointer // *int32
}

type sigset struct {
	__bits [4]uint32
}

type stackt struct {
	ss_sp     uintptr
	ss_size   uintptr
	ss_flags  int32
	pad_cgo_0 [4]byte
}

type siginfo struct {
	si_signo  int32
	si_errno  int32
	si_code   int32
	si_pid    int32
	si_uid    uint32
	si_status int32
	si_addr   uint64

}

func extr4(x, x2 uint32) uint32 {
	return x<<7 + x2>>25 // arm64:"EXTRW\t[$]25,"
}

func extr5(x, x2 uint32) uint32 {
	return x<<7 | x2>>25 // arm64:"EXTRW\t[$]25,"
}

func extr6(x, x2 uint32) uint32 {
	return x<<7 ^ x2>>25 // arm64:"EXTRW\t[$]25,"
}

// check 32-bit shift masking
func mask32(x uint32) uint32 {
	return (x << 29) >> 29 // arm64:"AND\t[$]7, R[0-9]+",-"LSR",-"LSL"