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Thanks to Timo Kreuzer for discovering what led to these:

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[KERNEL32]: BasepInitializeContext was not creating a correct CONTEXT record for fibers: the stack return address was not set (EIP was being used instead), and support for FPU-compatible Fibers was non-existent.
[KERNEL32]: CreateFiberEx was not passing the correct context flags to BasepInitializeContext to notify it that this is an FPU-fiber.
[KERNEL32]: SwitchToFiber was using some weird "FXSR" constant that maps to checking of PowerPC 64-bit Move instructions are available. We actually want to check for XMMI.

svn path=/trunk/; revision=52809
This commit is contained in:
Alex Ionescu 2011-07-23 16:26:03 +00:00
parent 5a85fe0145
commit 09a15b8b05
3 changed files with 42 additions and 21 deletions
Download patch file Download diff file Expand all files Collapse all files

7
reactos/dll/win32/kernel32/client/fiber.c
View file

@ -223,11 +223,8 @@ CreateFiberEx(SIZE_T dwStackCommitSize,
Fiber->ActivationContextStack = ActivationContextStack;
Fiber->Context.ContextFlags = CONTEXT_FULL;
/* Save FPU State if requsted */
if (dwFlags & FIBER_FLAG_FLOAT_SWITCH)
{
Fiber->Context.ContextFlags |= CONTEXT_FLOATING_POINT;
}
/* Save FPU State if requested */
Fiber->Context.ContextFlags = (dwFlags & FIBER_FLAG_FLOAT_SWITCH) ? CONTEXT_FLOATING_POINT : 0;
/* initialize the context for the fiber */
BasepInitializeContext(&Fiber->Context,

4
reactos/dll/win32/kernel32/client/i386/fiber.S
View file

@ -35,7 +35,7 @@ _SwitchToFiber@4:
fnstcw [eax+FIBER_CONTEXT_FLOAT_SAVE_CONTROL_WORD]
/* Check if the CPU supports SIMD MXCSR State Save */
cmp byte ptr ds:[PROCESSOR_FEATURE_FXSR], 1
cmp byte ptr ds:[PF_XMMI_INSTRUCTIONS_AVAILABLE], 1
jnz NoFpuStateSave
stmxcsr [eax+FIBER_CONTEXT_DR6]
@ -99,7 +99,7 @@ StatusWordChanged:
ControlWordEqual:
/* Load the new one */
cmp byte ptr ds:[PROCESSOR_FEATURE_FXSR], 1
cmp byte ptr ds:[PF_XMMI_INSTRUCTIONS_AVAILABLE], 1
jnz NoFpuStateRestore
ldmxcsr [ecx+FIBER_CONTEXT_DR6]

52
reactos/dll/win32/kernel32/client/utils.c
View file

@ -336,8 +336,9 @@ BasepInitializeContext(IN PCONTEXT Context,
IN ULONG ContextType)
{
#ifdef _M_IX86
ULONG ContextFlags;
DPRINT("BasepInitializeContext: %p\n", Context);
/* Setup the Initial Win32 Thread Context */
Context->Eax = (ULONG)StartAddress;
Context->Ebx = (ULONG)Parameter;
@ -352,30 +353,53 @@ BasepInitializeContext(IN PCONTEXT Context,
Context->SegSs = KGDT_R3_DATA | RPL_MASK;
Context->SegGs = 0;
/* Set the Context Flags */
ContextFlags = Context->ContextFlags;
Context->ContextFlags = CONTEXT_FULL;
/* Give it some room for the Parameter */
Context->Esp -= sizeof(PVOID);
/* Set the EFLAGS */
Context->EFlags = 0x3000; /* IOPL 3 */
if (ContextType == 1) /* For Threads */
/* What kind of context is being created? */
if (ContextType == 1)
{
/* For Threads */
Context->Eip = (ULONG)BaseThreadStartupThunk;
}
else if (ContextType == 2) /* For Fibers */
else if (ContextType == 2)
{
Context->Eip = (ULONG)BaseFiberStartup;
/* This is a fiber: make space for the return address */
Context->Esp -= sizeof(PVOID);
*((PVOID*)Context->Esp) = BaseFiberStartup;
/* Is FPU state required? */
Context->ContextFlags |= ContextFlags;
if (ContextFlags == CONTEXT_FLOATING_POINT)
{
/* Set an initial state */
Context->FloatSave.ControlWord = 0x27F;
Context->FloatSave.StatusWord = 0;
Context->FloatSave.TagWord = 0xFFFF;
Context->FloatSave.ErrorOffset = 0;
Context->FloatSave.ErrorSelector = 0;
Context->FloatSave.DataOffset = 0;
Context->FloatSave.DataSelector = 0;
if (SharedUserData->ProcessorFeatures[PF_XMMI_INSTRUCTIONS_AVAILABLE])
Context->Dr6 = 0x1F80;
}
}
else /* For first thread in a Process */
else
{
/* For first thread in a Process */
Context->Eip = (ULONG)BaseProcessStartThunk;
}
/* Set the Context Flags */
Context->ContextFlags = CONTEXT_FULL;
/* Give it some room for the Parameter */
Context->Esp -= sizeof(PVOID);
#elif defined(_M_AMD64)
DPRINT("BasepInitializeContext: %p\n", Context);
/* Setup the Initial Win32 Thread Context */
Context->Rax = (ULONG_PTR)StartAddress;
Context->Rbx = (ULONG_PTR)Parameter;
@ -405,10 +429,10 @@ BasepInitializeContext(IN PCONTEXT Context,
{
Context->Rip = (ULONG_PTR)BaseProcessStartThunk;
}
/* Set the Context Flags */
Context->ContextFlags = CONTEXT_FULL;
/* Give it some room for the Parameter */
Context->Rsp -= sizeof(PVOID);
#else