* PROJECT: ReactOS kernel
* FILE: ntoskrnl/ke/usercall.c
* PURPOSE: User-Mode callbacks. Portable part.
- *
* PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
*/
#define NDEBUG
#include <internal/debug.h>
-/* FUNCTIONS *****************************************************************/
-
-#if ALEX_CB_REWRITE
-
NTSTATUS
STDCALL
-KiSwitchToUserMode(IN PVOID *OutputBuffer,
- IN PULONG OutputLength);
-
-#else
-
-typedef struct _NTW32CALL_SAVED_STATE
-{
- ULONG_PTR SavedStackLimit;
- PVOID SavedStackBase;
- PVOID SavedInitialStack;
- PVOID CallerResult;
- PULONG CallerResultLength;
- PNTSTATUS CallbackStatus;
- PKTRAP_FRAME SavedTrapFrame;
- PVOID SavedCallbackStack;
- PVOID SavedExceptionStack;
-} NTW32CALL_SAVED_STATE, *PNTW32CALL_SAVED_STATE;
-
-typedef struct
-{
- PVOID BaseAddress;
- LIST_ENTRY ListEntry;
-} NTW32CALL_CALLBACK_STACK, *PNTW32CALL_CALLBACK_STACK;
-
-KSPIN_LOCK CallbackStackListLock;
-static LIST_ENTRY CallbackStackListHead;
-
-VOID INIT_FUNCTION
-PsInitialiseW32Call(VOID)
-{
- InitializeListHead(&CallbackStackListHead);
- KeInitializeSpinLock(&CallbackStackListLock);
-}
+KiCallUserMode(
+ IN PVOID *OutputBuffer,
+ IN PULONG OutputLength
+);
-VOID STATIC
-PsFreeCallbackStackPage(PVOID Context, MEMORY_AREA* MemoryArea, PVOID Address,
- PFN_TYPE Page, SWAPENTRY SwapEntry,
- BOOLEAN Dirty)
-{
- ASSERT(SwapEntry == 0);
- if (Page != 0)
- {
- MmReleasePageMemoryConsumer(MC_NPPOOL, Page);
- }
-}
-
-VOID STATIC
-PsFreeCallbackStack(PVOID StackLimit)
-{
- MmLockAddressSpace(MmGetKernelAddressSpace());
- MmFreeMemoryAreaByPtr(MmGetKernelAddressSpace(),
- StackLimit,
- PsFreeCallbackStackPage,
- NULL);
- MmUnlockAddressSpace(MmGetKernelAddressSpace());
-}
-
-VOID
-PsFreeCallbackStacks(VOID)
-{
- PLIST_ENTRY CurrentListEntry;
- PNTW32CALL_CALLBACK_STACK Current;
-
- while (!IsListEmpty(&CallbackStackListHead))
- {
- CurrentListEntry = RemoveHeadList(&CallbackStackListHead);
- Current = CONTAINING_RECORD(CurrentListEntry, NTW32CALL_CALLBACK_STACK,
- ListEntry);
- PsFreeCallbackStack(Current->BaseAddress);
- ExFreePool(Current);
- }
-}
+PULONG
+STDCALL
+KiGetUserModeStackAddress(
+ VOID
+);
-PVOID STATIC
-PsAllocateCallbackStack(ULONG StackSize)
-{
- PVOID KernelStack = NULL;
- NTSTATUS Status;
- PMEMORY_AREA StackArea;
- ULONG i, j;
- PHYSICAL_ADDRESS BoundaryAddressMultiple;
- PPFN_TYPE Pages = alloca(sizeof(PFN_TYPE) * (StackSize /PAGE_SIZE));
-
-
- BoundaryAddressMultiple.QuadPart = 0;
- StackSize = PAGE_ROUND_UP(StackSize);
- MmLockAddressSpace(MmGetKernelAddressSpace());
- Status = MmCreateMemoryArea(NULL,
- MmGetKernelAddressSpace(),
- MEMORY_AREA_KERNEL_STACK,
- &KernelStack,
- StackSize,
- 0,
- &StackArea,
- FALSE,
- FALSE,
- BoundaryAddressMultiple);
- MmUnlockAddressSpace(MmGetKernelAddressSpace());
- if (!NT_SUCCESS(Status))
- {
- DPRINT("Failed to create thread stack\n");
- return(NULL);
- }
- for (i = 0; i < (StackSize / PAGE_SIZE); i++)
- {
- Status = MmRequestPageMemoryConsumer(MC_NPPOOL, TRUE, &Pages[i]);
- if (!NT_SUCCESS(Status))
- {
- for (j = 0; j < i; j++)
- {
- MmReleasePageMemoryConsumer(MC_NPPOOL, Pages[j]);
- }
- return(NULL);
- }
- }
- Status = MmCreateVirtualMapping(NULL,
- KernelStack,
- PAGE_READWRITE,
- Pages,
- StackSize / PAGE_SIZE);
- if (!NT_SUCCESS(Status))
- {
- for (i = 0; i < (StackSize / PAGE_SIZE); i++)
- {
- MmReleasePageMemoryConsumer(MC_NPPOOL, Pages[i]);
- }
- return(NULL);
- }
- return(KernelStack);
-}
-#endif
+/* FUNCTIONS *****************************************************************/
/*
* @implemented
OUT PVOID *Result,
OUT PULONG ResultLength)
{
- PETHREAD Thread;
- PVOID NewStack;
- ULONG_PTR StackSize;
- PKTRAP_FRAME NewFrame;
- PULONG UserEsp;
- KIRQL oldIrql;
- NTSTATUS CallbackStatus;
- NTW32CALL_SAVED_STATE SavedState;
- PNTW32CALL_CALLBACK_STACK AssignedStack;
-
- PAGED_CODE();
-
- DPRINT("KeUserModeCallback(RoutineIndex %d, Argument %X, ArgumentLength %d)\n",
- RoutineIndex, Argument, ArgumentLength);
-
- Thread = PsGetCurrentThread();
-
- /* Set up the new kernel and user environment. */
- StackSize = (ULONG_PTR)Thread->Tcb.StackBase - Thread->Tcb.StackLimit;
- KeAcquireSpinLock(&CallbackStackListLock, &oldIrql);
- if (IsListEmpty(&CallbackStackListHead))
+ ULONG_PTR NewStack, OldStack;
+ PULONG UserEsp;
+ NTSTATUS CallbackStatus = STATUS_SUCCESS;
+ PEXCEPTION_REGISTRATION_RECORD ExceptionList;
+ DPRINT("KeUserModeCallback(RoutineIndex %d, Argument %X, ArgumentLength %d)\n",
+ RoutineIndex, Argument, ArgumentLength);
+ ASSERT(KeGetCurrentThread()->ApcState.KernelApcInProgress == FALSE);
+ ASSERT(KeGetPreviousMode() == UserMode);
+
+ /* Get the current user-mode stack */
+ UserEsp = KiGetUserModeStackAddress();
+ OldStack = *UserEsp;
+
+ /* Enter a SEH Block */
+ _SEH_TRY
{
- KeReleaseSpinLock(&CallbackStackListLock, oldIrql);
- NewStack = PsAllocateCallbackStack(StackSize);
- AssignedStack = ExAllocatePool(NonPagedPool,
- sizeof(NTW32CALL_CALLBACK_STACK));
- AssignedStack->BaseAddress = NewStack;
- }
- else
- {
- PLIST_ENTRY StackEntry;
-
- StackEntry = RemoveHeadList(&CallbackStackListHead);
- KeReleaseSpinLock(&CallbackStackListLock, oldIrql);
- AssignedStack = CONTAINING_RECORD(StackEntry, NTW32CALL_CALLBACK_STACK,
- ListEntry);
- NewStack = AssignedStack->BaseAddress;
- RtlZeroMemory(NewStack, StackSize);
+ /* Calculate and align the stack size */
+ NewStack = (OldStack - ArgumentLength) & ~3;
+
+ /* Make sure it's writable */
+ ProbeForWrite((PVOID)(NewStack - 6 * sizeof(ULONG_PTR)),
+ ArgumentLength + 6 * sizeof(ULONG_PTR),
+ sizeof(CHAR));
+
+ /* Copy the buffer into the stack */
+ RtlCopyMemory((PVOID)NewStack, Argument, ArgumentLength);
+
+ /* Write the arguments */
+ NewStack -= 24;
+ *(PULONG)NewStack = 0;
+ *(PULONG)(NewStack + 4) = RoutineIndex;
+ *(PULONG)(NewStack + 8) = (NewStack + 24);
+ *(PULONG)(NewStack + 12) = ArgumentLength;
+
+ /* Save the exception list */
+ ExceptionList = KeGetCurrentThread()->Teb->Tib.ExceptionList;
+
+ /* Jump to user mode */
+ *UserEsp = NewStack;
+ CallbackStatus = KiCallUserMode(Result, ResultLength);
+
+ /* FIXME: Handle user-mode exception status */
+
+ /* Restore exception list */
+ KeGetCurrentThread()->Teb->Tib.ExceptionList = ExceptionList;
}
- /* FIXME: Need to check whether we were interrupted from v86 mode. */
- RtlCopyMemory((char*)NewStack + StackSize - sizeof(KTRAP_FRAME) - sizeof(FX_SAVE_AREA),
- Thread->Tcb.TrapFrame, sizeof(KTRAP_FRAME) - (4 * sizeof(DWORD)));
- NewFrame = (PKTRAP_FRAME)((char*)NewStack + StackSize - sizeof(KTRAP_FRAME) - sizeof(FX_SAVE_AREA));
- /* We need the stack pointer to remain 4-byte aligned */
- NewFrame->Esp -= (((ArgumentLength + 3) & (~ 0x3)) + (4 * sizeof(ULONG)));
- NewFrame->Eip = (ULONG)LdrpGetSystemDllCallbackDispatcher();
- UserEsp = (PULONG)NewFrame->Esp;
- UserEsp[0] = 0; /* Return address. */
- UserEsp[1] = RoutineIndex;
- UserEsp[2] = (ULONG)&UserEsp[4];
- UserEsp[3] = ArgumentLength;
- RtlCopyMemory((PVOID)&UserEsp[4], Argument, ArgumentLength);
-
- /* Switch to the new environment and return to user-mode. */
- KeRaiseIrql(HIGH_LEVEL, &oldIrql);
- SavedState.SavedStackLimit = Thread->Tcb.StackLimit;
- SavedState.SavedStackBase = Thread->Tcb.StackBase;
- SavedState.SavedInitialStack = Thread->Tcb.InitialStack;
- SavedState.CallerResult = Result;
- SavedState.CallerResultLength = ResultLength;
- SavedState.CallbackStatus = &CallbackStatus;
- SavedState.SavedTrapFrame = Thread->Tcb.TrapFrame;
- SavedState.SavedCallbackStack = Thread->Tcb.CallbackStack;
- SavedState.SavedExceptionStack = (PVOID)KeGetCurrentKPCR()->TSS->Esp0;
- if ((Thread->Tcb.NpxState & NPX_STATE_VALID) &&
- ETHREAD_TO_KTHREAD(Thread) != KeGetCurrentPrcb()->NpxThread)
+ _SEH_HANDLE
{
- RtlCopyMemory((char*)NewStack + StackSize - sizeof(FX_SAVE_AREA),
- (char*)SavedState.SavedInitialStack - sizeof(FX_SAVE_AREA),
- sizeof(FX_SAVE_AREA));
+ CallbackStatus = _SEH_GetExceptionCode();
}
- Thread->Tcb.InitialStack = Thread->Tcb.StackBase = (char*)NewStack + StackSize;
- Thread->Tcb.StackLimit = (ULONG)NewStack;
- Thread->Tcb.KernelStack = (char*)NewStack + StackSize - sizeof(KTRAP_FRAME) - sizeof(FX_SAVE_AREA);
- KeGetCurrentKPCR()->TSS->Esp0 = (ULONG)Thread->Tcb.InitialStack - sizeof(FX_SAVE_AREA);
- KePushAndStackSwitchAndSysRet((ULONG)&SavedState, Thread->Tcb.KernelStack);
-
- /*
- * The callback return will have already restored most of the state we
- * modified.
- */
- KeLowerIrql(DISPATCH_LEVEL);
- KeAcquireSpinLockAtDpcLevel(&CallbackStackListLock);
- InsertTailList(&CallbackStackListHead, &AssignedStack->ListEntry);
- KeReleaseSpinLock(&CallbackStackListLock, PASSIVE_LEVEL);
- return(CallbackStatus);
+ _SEH_END;
+
+ /* FIXME: Flush GDI Batch */
+
+ /* Restore stack and return */
+ *UserEsp = OldStack;
+ return CallbackStatus;
}
/* EOF */
projects / reactos.git / blobdiff