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Initialize thread context for i686

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This commit is contained in:
Rafal Kupiec
2023-03-15 23:05:18 +01:00
parent e05366815a
commit e6b64b741a
3 changed files with 82 additions and 5 deletions
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75
xtoskrnl/ke/i686/kthread.c
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@@ -39,5 +39,78 @@ KepInitializeThreadContext(IN PKTHREAD Thread,
IN PVOID StartContext,
IN PCONTEXT ContextRecord)
{
UNIMPLEMENTED;
PKTHREAD_INIT_FRAME ThreadFrame;
PSIMD_SAVE_AREA SimdSaveArea;
/* Set initial thread frame */
ThreadFrame = (PKTHREAD_INIT_FRAME)Thread->InitialStack - sizeof(KTHREAD_INIT_FRAME);
/* Fill floating point save area with zeroes */
RtlZeroMemory(&ThreadFrame->NpxFrame, sizeof(FLOATING_SAVE_AREA));
/* Check if context provided for this thread */
if(ContextRecord)
{
/* Fill trap frame with zeroes */
RtlZeroMemory(&ThreadFrame->TrapFrame, sizeof(KTRAP_FRAME));
/* Disable debug registers and enable context registers */
ContextRecord->ContextFlags &= ~CONTEXT_DEBUG_REGISTERS | CONTEXT_CONTROL;
/* This is user mode thread */
Thread->PreviousMode = UserMode;
/* Disable coprocessor floating point state */
Thread->NpxState = CR0_TS | CR0_MP;
Thread->Header.NpxIrql = PASSIVE_LEVEL;
/* Set initial floating point state */
ThreadFrame->NpxFrame.Cr0NpxState = 0;
ThreadFrame->NpxFrame.NpxSavedCpu = 0;
SimdSaveArea = (PSIMD_SAVE_AREA)ContextRecord->ExtendedRegisters;
SimdSaveArea->ControlWord = 0x27F;
SimdSaveArea->MxCsr = 0x1F80;
ContextRecord->FloatSave.Cr0NpxState = 0;
/* Clear DR6 and DR7 registers */
ThreadFrame->TrapFrame.Dr6 = 0;
ThreadFrame->TrapFrame.Dr7 = 0;
/* Set exception list pointer in the trap frame */
ThreadFrame->TrapFrame.ExceptionList = (PEXCEPTION_REGISTRATION_RECORD) - 1;
/* Set DS, ES and SS segments for user mode */
ThreadFrame->TrapFrame.SegDs |= RPL_MASK;
ThreadFrame->TrapFrame.SegEs |= RPL_MASK;
ThreadFrame->TrapFrame.HardwareSegSs |= RPL_MASK;
/* Set kernel mode thread in the trap frame */
ThreadFrame->TrapFrame.PreviousMode = UserMode;
}
else
{
/* This is kernel mode thread */
Thread->PreviousMode = KernelMode;
/* Disable coprocessor floating point state */
Thread->NpxState = CR0_TS | CR0_MP;
/* Set initial floating point state */
ThreadFrame->NpxFrame.FxArea.ControlWord = 0x27F;
ThreadFrame->NpxFrame.FxArea.MxCsr = 0x1F80;
/* Mark as kernel mode thread in the start frame */
ThreadFrame->StartFrame.UserMode = FALSE;
}
/* Initialize thread startup information */
ThreadFrame->StartFrame.StartContext = StartContext;
ThreadFrame->StartFrame.StartRoutine = StartRoutine;
ThreadFrame->StartFrame.SystemRoutine = SystemRoutine;
/* Initialize switch frame */
ThreadFrame->SwitchFrame.ExceptionList = (PEXCEPTION_REGISTRATION_RECORD) - 1;
/* Set thread stack */
Thread->KernelStack = &ThreadFrame->SwitchFrame;
}