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510 lines
14 KiB
510 lines
14 KiB
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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thredini.c
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Abstract:
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This module implements the machine dependent function to set the initial
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context and data alignment handling mode for a process or thread object.
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Author:
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David N. Cutler (davec) 31-Mar-1990
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Environment:
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Kernel mode only.
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Revision History:
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3 April 90 bryan willman
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This version ported to 386.
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--*/
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#include "ki.h"
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//
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// The following assert macros are used to check that an input object is
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// really the proper type.
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//
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#define ASSERT_PROCESS(E) { \
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ASSERT((E)->Header.Type == ProcessObject); \
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}
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#define ASSERT_THREAD(E) { \
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ASSERT((E)->Header.Type == ThreadObject); \
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}
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//
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// Our notion of alignment is different, so force use of ours
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//
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#undef ALIGN_UP
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#undef ALIGN_DOWN
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#define ALIGN_DOWN(address,amt) ((ULONG)(address) & ~(( amt ) - 1))
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#define ALIGN_UP(address,amt) (ALIGN_DOWN( (address + (amt) - 1), (amt) ))
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//
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// The function prototype for the special APC we use to set the
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// hardware alignment state for a thread
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//
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VOID
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KepSetAlignmentSpecialApc(
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IN PKAPC Apc,
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IN PKNORMAL_ROUTINE *NormalRoutine,
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IN PVOID *NormalContext,
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IN PVOID *SystemArgument1,
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IN PVOID *SystemArgument2
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);
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VOID
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KiInitializeContextThread (
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IN PKTHREAD Thread,
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IN PKSYSTEM_ROUTINE SystemRoutine,
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IN PKSTART_ROUTINE StartRoutine OPTIONAL,
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IN PVOID StartContext OPTIONAL,
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IN PCONTEXT ContextFrame OPTIONAL
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)
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/*++
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Routine Description:
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This function initializes the machine dependent context of a thread object.
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N.B. This function does not check the accessibility of the context record.
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It is assumed the the caller of this routine is either prepared to
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handle access violations or has probed and copied the context record
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as appropriate.
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Arguments:
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Thread - Supplies a pointer to a dispatcher object of type thread.
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SystemRoutine - Supplies a pointer to the system function that is to be
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called when the thread is first scheduled for execution.
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StartRoutine - Supplies an optional pointer to a function that is to be
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called after the system has finished initializing the thread. This
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parameter is specified if the thread is a system thread and will
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execute totally in kernel mode.
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StartContext - Supplies an optional pointer to an arbitrary data structure
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which will be passed to the StartRoutine as a parameter. This
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parameter is specified if the thread is a system thread and will
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execute totally in kernel mode.
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ContextFrame - Supplies an optional pointer a context frame which contains
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the initial user mode state of the thread. This parameter is specified
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if the thread is a user thread and will execute in user mode. If this
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parameter is not specified, then the Teb parameter is ignored.
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Return Value:
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None.
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--*/
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{
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PFX_SAVE_AREA NpxFrame;
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PKSWITCHFRAME SwitchFrame;
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PKTRAP_FRAME TrFrame;
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PULONG PSystemRoutine;
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PULONG PStartRoutine;
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PULONG PStartContext;
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PULONG PUserContextFlag;
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ULONG ContextFlags;
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CONTEXT Context2;
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PCONTEXT ContextFrame2 = NULL;
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PFXSAVE_FORMAT PFxSaveArea;
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//
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// If a context frame is specified, then initialize a trap frame and
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// and an exception frame with the specified user mode context.
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//
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if (ARGUMENT_PRESENT(ContextFrame)) {
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RtlCopyMemory(&Context2, ContextFrame, sizeof(CONTEXT));
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ContextFrame2 = &Context2;
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ContextFlags = CONTEXT_CONTROL;
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//
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// The 80387 save area is at the very base of the kernel stack.
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//
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NpxFrame = (PFX_SAVE_AREA)(((ULONG)(Thread->InitialStack) -
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sizeof(FX_SAVE_AREA)));
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TrFrame = (PKTRAP_FRAME)(((ULONG)NpxFrame - KTRAP_FRAME_LENGTH));
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//
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// Zero out the trap frame and save area
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//
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RtlZeroMemory(TrFrame, KTRAP_FRAME_LENGTH + sizeof(FX_SAVE_AREA));
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//
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// Load up an initial NPX state.
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//
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if (KeI386FxsrPresent == TRUE) {
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PFxSaveArea = (PFXSAVE_FORMAT)ContextFrame2->ExtendedRegisters;
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PFxSaveArea->ControlWord = 0x27f; // like fpinit but 64bit mode
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PFxSaveArea->StatusWord = 0;
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PFxSaveArea->TagWord = 0;
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PFxSaveArea->ErrorOffset = 0;
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PFxSaveArea->ErrorSelector = 0;
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PFxSaveArea->DataOffset = 0;
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PFxSaveArea->DataSelector = 0;
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PFxSaveArea->MXCsr = 0x1f80; // mask all the exceptions
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} else {
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ContextFrame2->FloatSave.ControlWord = 0x27f; // like fpinit but 64bit mode
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ContextFrame2->FloatSave.StatusWord = 0;
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ContextFrame2->FloatSave.TagWord = 0xffff;
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ContextFrame2->FloatSave.ErrorOffset = 0;
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ContextFrame2->FloatSave.ErrorSelector = 0;
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ContextFrame2->FloatSave.DataOffset = 0;
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ContextFrame2->FloatSave.DataSelector = 0;
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}
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if (KeI386NpxPresent) {
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ContextFrame2->FloatSave.Cr0NpxState = 0;
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NpxFrame->Cr0NpxState = 0;
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NpxFrame->NpxSavedCpu = 0;
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if (KeI386FxsrPresent == TRUE) {
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ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
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} else {
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ContextFlags |= CONTEXT_FLOATING_POINT;
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}
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//
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// Threads NPX state is not in the coprocessor.
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//
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Thread->NpxState = NPX_STATE_NOT_LOADED;
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Thread->NpxIrql = PASSIVE_LEVEL;
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} else {
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NpxFrame->Cr0NpxState = CR0_EM;
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//
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// Threads NPX state is not in the coprocessor.
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// In the emulator case, do not set the CR0_EM bit as their
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// emulators may not want exceptions on FWAIT instructions.
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//
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Thread->NpxState = NPX_STATE_NOT_LOADED & ~CR0_MP;
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}
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//
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// Force debug registers off. They won't work anyway from an
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// initial frame, debuggers must set a hard breakpoint in the target
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//
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ContextFrame2->ContextFlags &= ~CONTEXT_DEBUG_REGISTERS;
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#if 0
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//
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// If AutoAlignment is FALSE, we want to set the Alignment Check bit
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// in Eflags, so we will get alignment faults.
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//
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if (Thread->AutoAlignment == FALSE) {
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ContextFrame2->EFlags |= EFLAGS_ALIGN_CHECK;
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}
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#endif
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//
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// If the thread is set
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// Space for arguments to KiThreadStartup. Order is important,
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// Since args are passed on stack through KiThreadStartup to
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// PStartRoutine with PStartContext as an argument.
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PUserContextFlag = (PULONG)TrFrame - 1;
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PStartContext = PUserContextFlag - 1;
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PStartRoutine = PStartContext - 1;
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PSystemRoutine = PStartRoutine - 1;
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SwitchFrame = (PKSWITCHFRAME)((PUCHAR)PSystemRoutine -
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sizeof(KSWITCHFRAME));
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//
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// Copy information from the specified context frame to the trap and
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// exception frames.
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//
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KeContextToKframes(TrFrame, NULL, ContextFrame2,
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ContextFrame2->ContextFlags | ContextFlags,
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UserMode);
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TrFrame->HardwareSegSs |= RPL_MASK;
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TrFrame->SegDs |= RPL_MASK;
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TrFrame->SegEs |= RPL_MASK;
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TrFrame->Dr7 = 0;
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#if DBG
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TrFrame->DbgArgMark = 0xBADB0D00;
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#endif
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//
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// Tell KiThreadStartup that a user context is present.
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//
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*PUserContextFlag = 1;
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//
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// Initialize the kernel mode ExceptionList pointer
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//
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TrFrame->ExceptionList = EXCEPTION_CHAIN_END;
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//
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// Initialize the saved previous processor mode.
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//
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TrFrame->PreviousPreviousMode = UserMode;
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//
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// Set the previous mode in thread object to user.
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//
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Thread->PreviousMode = UserMode;
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} else {
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//
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// Dummy floating save area. Kernel threads don't have or use
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// the floating point - the dummy save area is make the stacks
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// consistent.
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//
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NpxFrame = (PFX_SAVE_AREA)(((ULONG)(Thread->InitialStack) -
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sizeof(FX_SAVE_AREA)));
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//
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// Load up an initial NPX state.
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//
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RtlZeroMemory((PVOID)NpxFrame, sizeof(FX_SAVE_AREA));
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if (KeI386FxsrPresent == TRUE) {
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NpxFrame->U.FxArea.ControlWord = 0x27f;//like fpinit but 64bit mode
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NpxFrame->U.FxArea.MXCsr = 0x1f80;// mask all the exceptions
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} else {
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NpxFrame->U.FnArea.ControlWord = 0x27f;//like fpinit but 64bit mode
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NpxFrame->U.FnArea.TagWord = 0xffff;
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}
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//
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// Threads NPX state is not in the coprocessor.
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//
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Thread->NpxState = NPX_STATE_NOT_LOADED;
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//
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// Space for arguments to KiThreadStartup.
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// Order of fields in the switchframe is important,
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// Since args are passed on stack through KiThreadStartup to
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// PStartRoutine with PStartContext as an argument.
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//
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PUserContextFlag = (PULONG)((ULONG)NpxFrame) - 1;
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PStartContext = PUserContextFlag - 1;
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PStartRoutine = PStartContext - 1;
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PSystemRoutine = PStartRoutine - 1;
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SwitchFrame = (PKSWITCHFRAME)((PUCHAR)PSystemRoutine -
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sizeof(KSWITCHFRAME));
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//
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// Tell KiThreadStartup that a user context is NOT present.
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//
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*PUserContextFlag = 0;
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//
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// Set the previous mode in thread object to kernel.
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//
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Thread->PreviousMode = KernelMode;
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}
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//
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// Set up thread start parameters.
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// (UserContextFlag set above)
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//
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*PStartContext = (ULONG)StartContext;
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*PStartRoutine = (ULONG)StartRoutine;
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*PSystemRoutine = (ULONG)SystemRoutine;
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//
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// Set up switch frame. Assume the thread doesn't use the 80387;
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// if it ever does (and there is one), these flags will get reset.
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// Each thread starts with these same flags set, regardless of
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// whether the hardware exists or not.
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//
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SwitchFrame->RetAddr = (ULONG)KiThreadStartup;
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SwitchFrame->ApcBypassDisable = TRUE;
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SwitchFrame->ExceptionList = (ULONG)(EXCEPTION_CHAIN_END);
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#if DBG
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//
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// On checked builds add a check field so context swap can break
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// early on bad context swaps (corrupted stacks for example).
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// We place this below the stack pointer so the kernel debugger
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// doesn't need knowledge of this.
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//
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((PULONG)SwitchFrame)[-1] = (ULONG)(ULONG_PTR)Thread;
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#endif
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//
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// Set the initial kernel stack pointer.
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//
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Thread->KernelStack = (PVOID)SwitchFrame;
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return;
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}
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BOOLEAN
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KeSetAutoAlignmentProcess (
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IN PKPROCESS Process,
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IN BOOLEAN Enable
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)
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/*++
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Routine Description:
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This function sets the data alignment handling mode for the specified
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process and returns the previous data alignment handling mode.
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Arguments:
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Process - Supplies a pointer to a dispatcher object of type process.
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Enable - Supplies a boolean value that determines the handling of data
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alignment exceptions for the process. A value of TRUE causes all
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data alignment exceptions to be automatically handled by the kernel.
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A value of FALSE causes all data alignment exceptions to be actually
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raised as exceptions.
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Return Value:
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A value of TRUE is returned if data alignment exceptions were
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previously automatically handled by the kernel. Otherwise, a value
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of FALSE is returned.
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--*/
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{
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KIRQL OldIrql;
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BOOLEAN Previous;
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ASSERT_PROCESS(Process);
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//
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// Raise IRQL to dispatcher level and lock dispatcher database.
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//
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KiLockDispatcherDatabase(&OldIrql);
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//
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// Capture the previous data alignment handling mode and set the
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// specified data alignment mode.
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//
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Previous = Process->AutoAlignment;
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Process->AutoAlignment = Enable;
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//
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// Unlock dispatcher database, lower IRQL to its previous value, and
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// return the previous data alignment mode.
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//
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KiUnlockDispatcherDatabase(OldIrql);
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return Previous;
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}
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BOOLEAN
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KeSetAutoAlignmentThread (
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IN PKTHREAD Thread,
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IN BOOLEAN Enable
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)
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/*++
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Routine Description:
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This function sets the data alignment handling mode for the specified
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thread and returns the previous data alignment handling mode.
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Arguments:
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Thread - Supplies a pointer to a dispatcher object of type thread.
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Enable - Supplies a boolean value that determines the handling of data
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alignment exceptions for the specified thread. A value of TRUE causes
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all data alignment exceptions to be automatically handled by the kernel.
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A value of FALSE causes all data alignment exceptions to be actually
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raised as exceptions.
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Return Value:
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A value of TRUE is returned if data alignment exceptions were
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previously automatically handled by the kernel. Otherwise, a value
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of FALSE is returned.
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--*/
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{
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BOOLEAN Previous;
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KIRQL OldIrql;
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ASSERT_THREAD(Thread);
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//
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// Raise IRQL to dispatcher level and lock dispatcher database.
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//
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KiLockDispatcherDatabase(&OldIrql);
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//
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// Capture the previous data alignment handling mode and set the
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// specified data alignment mode.
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//
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Previous = Thread->AutoAlignment;
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Thread->AutoAlignment = Enable;
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//
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// Unlock dispatcher database and lower IRQL to its previous value.
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//
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KiUnlockDispatcherDatabase(OldIrql);
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return(Previous);
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}
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