s0 = uint32(sbox0[t0>>24])<<24 | uint32(sbox0[t1>>16&0xff])<<16 | uint32(sbox0[t2>>8&0xff])<<8 | uint32(sbox0[t3&0xff])
	s1 = uint32(sbox0[t1>>24])<<24 | uint32(sbox0[t2>>16&0xff])<<16 | uint32(sbox0[t3>>8&0xff])<<8 | uint32(sbox0[t0&0xff])
	s2 = uint32(sbox0[t2>>24])<<24 | uint32(sbox0[t3>>16&0xff])<<16 | uint32(sbox0[t0>>8&0xff])<<8 | uint32(sbox0[t1&0xff])

func read(fd int32, p unsafe.Pointer, n int32) int32

func closefd(fd int32) int32

func exit(code int32)
func usleep(usec uint32)

//go:nosplit
func usleep_no_g(usec uint32) {
	usleep(usec)
}

// write1 calls the write system call.
// It returns a non-negative number of bytes written or a negative errno value.
//
//go:noescape
func write1(fd uintptr, p unsafe.Pointer, n int32) int32

//go:noescape

	allocationBase    uintptr
	allocationProtect uint32
	regionSize        uintptr
	state             uint32
	protect           uint32
	type_             uint32
}

// https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/ns-wdm-_osversioninfow
type _OSVERSIONINFOW struct {
	osVersionInfoSize uint32
	majorVersion      uint32
	minorVersion      uint32
	buildNumber       uint32
	platformId        uint32

	SC	R3, (R1)
	BEQ	R3, -4(PC)
	SYNC
	RET

// func Or32(addr *uint32, v uint32) old uint32
TEXT ·Or32(SB), NOSPLIT, $0-12
	MOVW	ptr+0(FP), R1
	MOVW	val+4(FP), R2

	SYNC
	LL	(R1), R3
	OR	R2, R3, R4
	SC	R4, (R1)
	BEQ	R4, -4(PC)
	SYNC
	MOVW	R3, ret+8(FP)
	RET

// func And32(addr *uint32, v uint32) old uint32
TEXT ·And32(SB), NOSPLIT, $0-12
	MOVW	ptr+0(FP), R1
	MOVW	val+4(FP), R2

// HashStr returns the hash and the appropriate multiplicative
// factor for use in Rabin-Karp algorithm.
func HashStr[T string | []byte](sep T) (uint32, uint32) {
	hash := uint32(0)
	for i := 0; i < len(sep); i++ {
		hash = hash*PrimeRK + uint32(sep[i])
	}
	var pow, sq uint32 = 1, PrimeRK
	for i := len(sep); i > 0; i >>= 1 {
		if i&1 != 0 {
			pow *= sq
		}
		sq *= sq
	}
	return hash, pow
}

	"unsafe"
)

// https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/ns-wdm-_osversioninfow
type _OSVERSIONINFOW struct {
	osVersionInfoSize uint32
	majorVersion      uint32
	minorVersion      uint32
	buildNumber       uint32
	platformId        uint32
	csdVersion        [128]uint16
}

// According to documentation, RtlGetVersion function always succeeds.

		}
		off = sb.SetUint32(ctxt.Arch, off, uint32(entryOff))

		// nameOff int32
		nameOff, ok := nameOffsets[s]
		if !ok {
			panic("couldn't find function name offset")
		}
		off = sb.SetUint32(ctxt.Arch, off, uint32(nameOff))

		// args int32
		// TODO: Move into funcinfo.
		args := uint32(0)
		if fi.Valid() {
			args = uint32(fi.Args())
		}
		off = sb.SetUint32(ctxt.Arch, off, args)

	// amd64:`MOVL\s\([A-Z]+\)`,-`MOV[BW]`,-`OR`
	return uint32(b[0]) | uint32(b[2])<<16 | uint32(b[1])<<8 | uint32(b[3])<<24
}

func extraOr_load_uint32(b []byte, x, y uint32) uint32 {
	// amd64:`ORL\s\([A-Z]+\)`,-`MOV[BW]`
	return x | binary.LittleEndian.Uint32(b) | y
	// TODO: Note that
	//   x | uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24 | y

func hammerSwapInt32Method(uaddr *uint32, count int) {
	addr := (*Int32)(unsafe.Pointer(uaddr))
	seed := int(uintptr(unsafe.Pointer(&count)))
	for i := 0; i < count; i++ {
		new := uint32(seed+i)<<16 | uint32(seed+i)<<16>>16
		old := uint32(addr.Swap(int32(new)))
		if old>>16 != old<<16>>16 {
			panic(fmt.Sprintf("SwapInt32 is not atomic: %v", old))
		}
	}
}

func hammerSwapUint32(addr *uint32, count int) {

	return a & (1 << 63)
}

func and_mask_3(a, b uint32) (uint32, uint32) {
	// arm/7:`BIC`,-`AND`
	a &= 0xffffaaaa
	// arm/7:`BFC`,-`AND`,-`BIC`
	b &= 0xffc003ff
	return a, b
}

// Check generation of arm64 BIC/EON/ORN instructions

func op_bic(x, y uint32) uint32 {
	// arm64:`BIC\t`,-`AND`
	return x &^ y
}

func op_eon(x, y, z uint32, a []uint32, n, m uint64) uint64 {
	// arm64:`EON\t`,-`EOR`,-`MVN`