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[NTOS:KE/x64] Initialize FP control word to INITIAL_FPCSR

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Timo Kreuzer
2025-07-02 21:38:19 +03:00
parent 80bef4fe40
commit f709f6f22f
1 changed files with 15 additions and 5 deletions
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20
ntoskrnl/ke/amd64/thrdini.c
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@@ -58,14 +58,24 @@ KiInitializeContextThread(IN PKTHREAD Thread,
Thread->StateSaveArea = InitialStack; Thread->StateSaveArea = InitialStack;
RtlZeroMemory(Thread->StateSaveArea, KeXStateLength); RtlZeroMemory(Thread->StateSaveArea, KeXStateLength);
Thread->StateSaveArea->MxCsr = INITIAL_MXCSR; Thread->StateSaveArea->MxCsr = INITIAL_MXCSR;
Thread->StateSaveArea->ControlWord = INITIAL_FPCSR;
/* Special initialization for XSAVES */ /* Check if we use XSAVE */
if (KeFeatureBits & KF_XSAVES) if (KeFeatureBits & KF_XSTATE)
{ {
/* Set bit 63 in XCOMP_BV to mark the area as compacted. /* Enable the mask for legacy floating point state */
XRSTORS requires this and will #GP otherwise. */
PXSAVE_AREA XSaveArea = (PXSAVE_AREA)Thread->StateSaveArea; PXSAVE_AREA XSaveArea = (PXSAVE_AREA)Thread->StateSaveArea;
XSaveArea->Header.CompactionMask = 0x8000000000000000ULL; XSaveArea->Header.Mask |= XSTATE_MASK_LEGACY_FLOATING_POINT;
/* Special initialization for XSAVES */
if (KeFeatureBits & KF_XSAVES)
{
/* Set bit 63 in XCOMP_BV to mark the area as compacted.
XRSTORS requires this and will #GP otherwise.
Also mark legacy FP as compacted. */
XSaveArea->Header.CompactionMask |= 0x8000000000000000ULL |
XSTATE_MASK_LEGACY_FLOATING_POINT;
}
} }
/* Check if this is a With-Context Thread */ /* Check if this is a With-Context Thread */