mirror of
https://github.com/reactos/reactos.git
synced 2024-08-20 02:13:29 +00:00
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/*
|
|
* PROJECT: ReactOS Kernel
|
|
* LICENSE: GPL - See COPYING in the top level directory
|
|
* FILE: ntoskrnl/ps/i386/psldt.c
|
|
* PURPOSE: LDT support for x86
|
|
* PROGRAMMERS: Stefan Ginsberg (stefan.ginsberg@reactos.org)
|
|
*/
|
|
|
|
/* INCLUDES ******************************************************************/
|
|
|
|
#include <ntoskrnl.h>
|
|
#define NDEBUG
|
|
#include <debug.h>
|
|
|
|
/* FUNCTIONS *****************************************************************/
|
|
|
|
VOID
|
|
NTAPI
|
|
PspDeleteLdt(PEPROCESS Process)
|
|
{
|
|
/* FIXME - LdtInformation must be null as long as we don't implement VDMs */
|
|
ASSERT(Process->LdtInformation == NULL);
|
|
}
|
|
|
|
VOID
|
|
NTAPI
|
|
PspDeleteVdmObjects(PEPROCESS Process)
|
|
{
|
|
/* 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, ' eK');
|
|
Process->VdmObjects = NULL;
|
|
}
|
|
|
|
NTSTATUS
|
|
NTAPI
|
|
PspQueryDescriptorThread(IN PETHREAD Thread,
|
|
IN PVOID ThreadInformation,
|
|
IN ULONG ThreadInformationLength,
|
|
OUT PULONG ReturnLength OPTIONAL)
|
|
{
|
|
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;
|
|
}
|