https://git.reactos.org/?p=reactos.git;a=commitdiff;h=39f11249ff93f3a362a89694de0cbe43ef52a158
commit 39f11249ff93f3a362a89694de0cbe43ef52a158 Author: Timo Kreuzer <[email protected]> AuthorDate: Sat Jul 23 13:31:27 2022 +0200 Commit: Timo Kreuzer <[email protected]> CommitDate: Mon Aug 22 11:22:08 2022 +0200 [NTOS][RTL] Initialize MxCsr where missing --- dll/win32/kernel32/client/utils.c | 3 +++ ntoskrnl/ke/amd64/context.c | 6 +++--- ntoskrnl/ke/amd64/cpu.c | 4 ++-- ntoskrnl/ke/amd64/kiinit.c | 6 ++++++ sdk/lib/rtl/amd64/stubs.c | 7 +++++-- 5 files changed, 19 insertions(+), 7 deletions(-) diff --git a/dll/win32/kernel32/client/utils.c b/dll/win32/kernel32/client/utils.c index c10d2d45004..54a6f05fa5c 100644 --- a/dll/win32/kernel32/client/utils.c +++ b/dll/win32/kernel32/client/utils.c @@ -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; diff --git a/ntoskrnl/ke/amd64/context.c b/ntoskrnl/ke/amd64/context.c index 0decbde88f9..1e9900af11f 100644 --- a/ntoskrnl/ke/amd64/context.c +++ b/ntoskrnl/ke/amd64/context.c @@ -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; diff --git a/ntoskrnl/ke/amd64/cpu.c b/ntoskrnl/ke/amd64/cpu.c index d4a8888c664..0967411e644 100644 --- a/ntoskrnl/ke/amd64/cpu.c +++ b/ntoskrnl/ke/amd64/cpu.c @@ -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 = diff --git a/ntoskrnl/ke/amd64/kiinit.c b/ntoskrnl/ke/amd64/kiinit.c index d9c8807bf34..310810475ea 100644 --- a/ntoskrnl/ke/amd64/kiinit.c +++ b/ntoskrnl/ke/amd64/kiinit.c @@ -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 diff --git a/sdk/lib/rtl/amd64/stubs.c b/sdk/lib/rtl/amd64/stubs.c index 7ffc4fb9658..0f02e60a41a 100644 --- a/sdk/lib/rtl/amd64/stubs.c +++ b/sdk/lib/rtl/amd64/stubs.c @@ -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; }
