psldt.c File Reference

#include <ntoskrnl.h>
#include <debug.h>

Include dependency graph for psldt.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
VOID NTAPI	PspDeleteLdt (PEPROCESS Process)
VOID NTAPI	PspDeleteVdmObjects (PEPROCESS Process)
NTSTATUS NTAPI	PspQueryDescriptorThread (IN PETHREAD Thread, IN PVOID ThreadInformation, IN ULONG ThreadInformationLength, OUT PULONG ReturnLength OPTIONAL)

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 12 of file psldt.c.

Function Documentation

PspDeleteLdt()

VOID NTAPI PspDeleteLdt

(

PEPROCESS

Process

)

Definition at line 19 of file psldt.c.

{
    /* FIXME - LdtInformation must be null as long as we don't implement VDMs */
    ASSERT(Process->LdtInformation == NULL);
}

Referenced by PspDeleteProcess().

PspDeleteVdmObjects()

VOID NTAPI PspDeleteVdmObjects

(

PEPROCESS

Process

)

Definition at line 27 of file psldt.c.

{
    /* If there are no VDM objects, just exit */
    if (Process->VdmObjects == NULL)
        return;
 
    /* FIXME: Need to do more than just freeing the main VdmObjects member! */
    UNIMPLEMENTED;
 
    /* Free VDM objects */
    ExFreePoolWithTag(Process->VdmObjects, TAG_KERNEL);
    Process->VdmObjects = NULL;
}

Referenced by PspDeleteProcess().

PspQueryDescriptorThread()

NTSTATUS NTAPI PspQueryDescriptorThread	(	IN PETHREAD	Thread,
		IN PVOID	ThreadInformation,
		IN ULONG	ThreadInformationLength,
		OUT PULONG ReturnLength	OPTIONAL
	)

Definition at line 43 of file psldt.c.

{
    DESCRIPTOR_TABLE_ENTRY DescriptorEntry;
    LDT_ENTRY Descriptor;
    NTSTATUS Status;
    PAGED_CODE();
 
    /* Verify the size */
    if (ThreadInformationLength != sizeof(DESCRIPTOR_TABLE_ENTRY))
    {
        /* Fail */
        return STATUS_INFO_LENGTH_MISMATCH;
    }
 
    /* Enter SEH for the copy */
    _SEH2_TRY
    {
        /* Get the descriptor */
        RtlCopyMemory(&DescriptorEntry,
                      ThreadInformation,
                      sizeof(DESCRIPTOR_TABLE_ENTRY));
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        /* Return the exception code */
        _SEH2_YIELD(return _SEH2_GetExceptionCode());
    }
    _SEH2_END;
 
    /* Check if this is a GDT selector */
    if (!(DescriptorEntry.Selector & 0x4))
    {
        /* Get the GDT entry */
        Status = Ke386GetGdtEntryThread(&Thread->Tcb,
                                        DescriptorEntry.Selector & 0xFFFFFFF8,
                                        (PKGDTENTRY)&Descriptor);
        if (!NT_SUCCESS(Status)) return Status;
 
        /* Enter SEH for the copy */
        _SEH2_TRY
        {
            /* Copy the GDT entry to caller */
            RtlCopyMemory(&((PDESCRIPTOR_TABLE_ENTRY)ThreadInformation)->
                          Descriptor,
                          &Descriptor,
                          sizeof(LDT_ENTRY));
            if (ReturnLength) *ReturnLength = sizeof(LDT_ENTRY);
        }
        _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
        {
            /* Return the exception code */
            _SEH2_YIELD(return _SEH2_GetExceptionCode());
        }
        _SEH2_END;
 
        /* Success */
        Status = STATUS_SUCCESS;
    }
    else
    {
        /* This is only supported for VDM, which we don't implement */
        ASSERT(Thread->ThreadsProcess->LdtInformation == NULL);
        Status = STATUS_NO_LDT;
    }
 
    /* Return status to caller */
    return Status;
}

Referenced by NtQueryInformationThread().