// syscall9 takes a pointer to a struct like:
// struct {
//	fn    uintptr
//	a1    uintptr
//	a2    uintptr
//	a3    uintptr
//	a4    uintptr
//	a5    uintptr
//	a6    uintptr
//	a7    uintptr
//	a8    uintptr
//	a9    uintptr
//	r1    uintptr
//	r2    uintptr
//	err   uintptr
// }
// syscall9 must be called on the g0 stack with the
// C calling convention (use libcCall).

	if src == 0 {
		for {
			var addr uintptr
			if tp, addr = tp.next(dst + size); addr == 0 {
				break
			}
			dstx := (*uintptr)(unsafe.Pointer(addr))
			p := buf.get1()
			p[0] = *dstx
		}
	} else {
		for {
			var addr uintptr
			if tp, addr = tp.next(dst + size); addr == 0 {
				break
			}
			dstx := (*uintptr)(unsafe.Pointer(addr))
			srcx := (*uintptr)(unsafe.Pointer(src + (addr - dst)))

//	pdNil - none of the above.
const (
	pdNil   uintptr = 0
	pdReady uintptr = 1
	pdWait  uintptr = 2
)

const pollBlockSize = 4 * 1024

// Network poller descriptor.
//
// No heap pointers.
type pollDesc struct {
	_     sys.NotInHeap
	link  *pollDesc      // in pollcache, protected by pollcache.lock
	fd    uintptr        // constant for pollDesc usage lifetime
	fdseq atomic.Uintptr // protects against stale pollDesc

	s.P = &si
	C.setstruct(s)

	if uintptr(unsafe.Pointer(&x))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
		t.Error("C int* argument on stack")
	}
	if uintptr(unsafe.Pointer(&y))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
		t.Error("C intptr argument on stack")
	}
	if uintptr(unsafe.Pointer(&v))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
		t.Error("C void* argument on stack")
	}

		print("stackalloc ", n, "\n")
	}

	if debug.efence != 0 || stackFromSystem != 0 {
		n = uint32(alignUp(uintptr(n), physPageSize))
		v := sysAlloc(uintptr(n), &memstats.stacks_sys)
		if v == nil {
			throw("out of memory (stackalloc)")
		}
		return stack{uintptr(v), uintptr(v) + uintptr(n)}
	}

	// Small stacks are allocated with a fixed-size free-list allocator.

		t.Errorf("C.CheckIssue6907C() == %d, want %d", got, 1)
	}
}

// issue 7665

var bad7665 unsafe.Pointer = C.f7665
var good7665 uintptr = uintptr(C.f7665)

func test7665(t *testing.T) {
	if bad7665 == nil || uintptr(bad7665) != good7665 {
		t.Errorf("ptrs = %p, %#x, want same non-nil pointer", bad7665, good7665)
	}
}

// issue 7978

var issue7978sync uint32

		addEntry := func(pos src.XPos, v *Value) {
			if curCall == nil || curCall.AuxInt == maxEntries {
				t := types.NewTuple(types.Types[types.TUINTPTR].PtrTo(), types.TypeMem)
				curCall = bThen.NewValue1(pos, OpWB, t, memThen)
				curPtr = bThen.NewValue1(pos, OpSelect0, types.Types[types.TUINTPTR].PtrTo(), curCall)
				memThen = bThen.NewValue1(pos, OpSelect1, types.TypeMem, curCall)
			}
			// Store value in write buffer

		var e Node = NewLinksymExpr(pos, name.LinksymABI(abi), types.Types[types.TUINTPTR])
		e = NewAddrExpr(pos, e)
		e.SetType(types.Types[types.TUINTPTR].PtrTo())
		e = NewConvExpr(pos, OCONVNOP, types.Types[types.TUINTPTR], e)
		e.SetTypecheck(1)
		return e
	}
	// fn is not a defined function. It must be ABIInternal.
	// Read the address from func value, i.e. *(*uintptr)(idata(fn)).
	if wantABI != obj.ABIInternal {

func sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) {
	var _p0 unsafe.Pointer
	if len(mib) > 0 {
		_p0 = unsafe.Pointer(&mib[0])
	} else {
		_p0 = unsafe.Pointer(&_zero)
	}
	_, _, e1 := syscall_syscall6(libc_sysctl_trampoline_addr, uintptr(_p0), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
	if e1 != 0 {

func sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) {
	var _p0 unsafe.Pointer
	if len(mib) > 0 {
		_p0 = unsafe.Pointer(&mib[0])
	} else {
		_p0 = unsafe.Pointer(&_zero)
	}
	_, _, e1 := syscall_syscall6(libc_sysctl_trampoline_addr, uintptr(_p0), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
	if e1 != 0 {