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[NTOS][RTL] Initialize MxCsr where missing

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This commit is contained in:
Timo Kreuzer 2022-07-23 13:31:27 +02:00
parent a82e46e521
commit 39f11249ff
5 changed files with 19 additions and 7 deletions
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3
dll/win32/kernel32/client/utils.c
View file

@ -600,6 +600,9 @@ BaseInitializeContext(IN PCONTEXT Context,
/* Set the EFLAGS */
Context->EFlags = 0x3000 | EFLAGS_INTERRUPT_MASK; /* IOPL 3 */
/* Set MXCSR */
Context->MxCsr = INITIAL_MXCSR;
if (ContextType == 1) /* For Threads */
{
Context->Rip = (ULONG_PTR)BaseThreadStartup;

6
ntoskrnl/ke/amd64/context.c
View file

@ -56,7 +56,7 @@ KeContextToTrapFrame(IN PCONTEXT Context,
}
/* Handle floating point registers */
if ((ContextFlags & CONTEXT_FLOATING_POINT))
if (ContextFlags & CONTEXT_FLOATING_POINT)
{
TrapFrame->MxCsr = Context->MxCsr;
TrapFrame->Xmm0 = Context->Xmm0;
@ -207,9 +207,9 @@ KeTrapFrameToContext(IN PKTRAP_FRAME TrapFrame,
}
/* Handle floating point registers */
if ((ContextFlags & CONTEXT_FLOATING_POINT) &&
((TrapFrame->SegCs & MODE_MASK) != KernelMode))
if (ContextFlags & CONTEXT_FLOATING_POINT)
{
Context->MxCsr = TrapFrame->MxCsr;
Context->Xmm0 = TrapFrame->Xmm0;
Context->Xmm1 = TrapFrame->Xmm1;
Context->Xmm2 = TrapFrame->Xmm2;

4
ntoskrnl/ke/amd64/cpu.c
View file

@ -375,7 +375,7 @@ KiRestoreProcessorControlState(PKPROCESSOR_STATE ProcessorState)
// __ltr(&ProcessorState->SpecialRegisters.Tr);
__lidt(&ProcessorState->SpecialRegisters.Idtr.Limit);
// __ldmxcsr(&ProcessorState->SpecialRegisters.MxCsr); // FIXME
_mm_setcsr(ProcessorState->SpecialRegisters.MxCsr);
// ProcessorState->SpecialRegisters.DebugControl
// ProcessorState->SpecialRegisters.LastBranchToRip
// ProcessorState->SpecialRegisters.LastBranchFromRip
@ -417,7 +417,7 @@ KiSaveProcessorControlState(OUT PKPROCESSOR_STATE ProcessorState)
__str(&ProcessorState->SpecialRegisters.Tr);
__sidt(&ProcessorState->SpecialRegisters.Idtr.Limit);
// __stmxcsr(&ProcessorState->SpecialRegisters.MxCsr);
ProcessorState->SpecialRegisters.MxCsr = _mm_getcsr();
// ProcessorState->SpecialRegisters.DebugControl =
// ProcessorState->SpecialRegisters.LastBranchToRip =
// ProcessorState->SpecialRegisters.LastBranchFromRip =

6
ntoskrnl/ke/amd64/kiinit.c
View file

@ -152,6 +152,9 @@ KiInitializePcr(IN PKIPCR Pcr,
Pcr->Prcb.ProcessorState.SpecialRegisters.KernelDr6 = 0;
Pcr->Prcb.ProcessorState.SpecialRegisters.KernelDr7 = 0;
/* Initialize MXCSR (all exceptions masked) */
Pcr->Prcb.MxCsr = INITIAL_MXCSR;
/* Set the Current Thread */
Pcr->Prcb.CurrentThread = IdleThread;
@ -231,6 +234,9 @@ KiInitializeCpu(PKIPCR Pcr)
Pat = (PAT_WB << 0) | (PAT_WC << 8) | (PAT_UCM << 16) | (PAT_UC << 24) |
(PAT_WB << 32) | (PAT_WC << 40) | (PAT_UCM << 48) | (PAT_UC << 56);
__writemsr(MSR_PAT, Pat);
/* Initialize MXCSR */
_mm_setcsr(INITIAL_MXCSR);
}
VOID

7
sdk/lib/rtl/amd64/stubs.c
View file

@ -23,7 +23,7 @@ NTAPI
RtlInitializeContext(
_Reserved_ HANDLE ProcessHandle,
_Out_ PCONTEXT ThreadContext,
_In_ PVOID ThreadStartParam OPTIONAL,
_In_opt_ PVOID ThreadStartParam,
_In_ PTHREAD_START_ROUTINE ThreadStartAddress,
_In_ PINITIAL_TEB StackBase)
{
@ -66,10 +66,13 @@ RtlInitializeContext(
ThreadContext->SegSs = KGDT64_R3_DATA | RPL_MASK;
}
ThreadContext->MxCsr = INITIAL_MXCSR;
/* Only the basic Context is initialized */
ThreadContext->ContextFlags = CONTEXT_CONTROL |
CONTEXT_INTEGER |
CONTEXT_SEGMENTS;
CONTEXT_SEGMENTS |
CONTEXT_FLOATING_POINT;
return;
}