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Definition at line 1346 of file traphdlr.c. {
PKTHREAD Thread;
PFX_SAVE_AREA SaveArea;
ULONG Cr0, MxCsrMask, Error;
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Check if this is the NPX thrad */
Thread = KeGetCurrentThread();
if (Thread != KeGetCurrentPrcb()->NpxThread)
{
/* It isn't, kill the system */
KeBugCheckWithTf(TRAP_CAUSE_UNKNOWN, 13, (ULONG_PTR)Thread, 0, 0, TrapFrame);
}
/* Get the NPX frame */
SaveArea = KiGetThreadNpxArea(Thread);
/* Check for VDM trap */
ASSERT((KiVdmTrap(TrapFrame)) == FALSE);
/* Check for user trap */
if (!KiUserTrap(TrapFrame))
{
/* Kernel should not fault on XMMI */
KeBugCheckWithTf(TRAP_CAUSE_UNKNOWN, 13, 0, 0, 2, TrapFrame);
}
/* Update CR0 */
Cr0 = __readcr0();
Cr0 &= ~(CR0_MP | CR0_EM | CR0_TS);
__writecr0(Cr0);
/* Save FPU state */
Ke386SaveFpuState(SaveArea);
/* Mark CR0 state dirty */
Cr0 |= NPX_STATE_NOT_LOADED;
Cr0 |= SaveArea->Cr0NpxState;
__writecr0(Cr0);
/* Update NPX state */
Thread->NpxState = NPX_STATE_NOT_LOADED;
KeGetCurrentPrcb()->NpxThread = NULL;
/* Clear the TS bit and re-enable interrupts */
SaveArea->Cr0NpxState &= ~CR0_TS;
_enable();
/* Now look at MxCsr to get the mask of errors we should care about */
MxCsrMask = ~((USHORT)SaveArea->U.FxArea.MXCsr >> 7);
/* Get legal exceptions that software should handle */
Error = (USHORT)SaveArea->U.FxArea.MXCsr & (FSW_INVALID_OPERATION |
FSW_DENORMAL |
FSW_ZERO_DIVIDE |
FSW_OVERFLOW |
FSW_UNDERFLOW |
FSW_PRECISION);
Error &= MxCsrMask;
/* Now handle any of those legal errors */
if (Error & (FSW_INVALID_OPERATION |
FSW_DENORMAL |
FSW_ZERO_DIVIDE |
FSW_OVERFLOW |
FSW_UNDERFLOW |
FSW_PRECISION))
{
/* By issuing an exception */
KiDispatchException1Args(STATUS_FLOAT_MULTIPLE_TRAPS,
TrapFrame->Eip,
0,
TrapFrame);
}
/* Unknown XMMI fault */
KeBugCheckWithTf(TRAP_CAUSE_UNKNOWN, 13, 0, 0, 1, TrapFrame);
}
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