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Initialize thread context for AMD64

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This commit is contained in:
Rafal Kupiec
2023-03-14 17:37:20 +01:00
parent 8f653c47dc
commit 5677719038
3 changed files with 109 additions and 1 deletions
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80
xtoskrnl/ke/amd64/kthread.c
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@@ -39,5 +39,83 @@ KepInitializeThreadContext(IN PKTHREAD Thread,
IN PVOID StartContext,
IN PCONTEXT ContextRecord)
{
UNIMPLEMENTED;
PKTHREAD_INIT_FRAME ThreadFrame;
/* 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 exception and trap frames with zeroes */
RtlZeroMemory(&ThreadFrame->ExceptionFrame, sizeof(KEXCEPTION_FRAME));
RtlZeroMemory(&ThreadFrame->TrapFrame, sizeof(KTRAP_FRAME));
/* Disable debug registers and enable context registers */
ContextRecord->ContextFlags &= ~CONTEXT_DEBUG_REGISTERS | CONTEXT_CONTROL;
/* Align the stack and reserve space for 4 parameters and return value */
ContextRecord->Rsp = (ContextRecord->Rsp & ~15) - 40;
/* Set CS and SS segments for user mode */
ContextRecord->SegCs = KGDT_R3_CODE | RPL_MASK;
ContextRecord->SegSs = KGDT_R3_DATA | RPL_MASK;
/* This is user mode thread */
Thread->PreviousMode = UserMode;
/* Enable floating point state */
Thread->NpxState = 1;
/* Set initial floating point state */
ThreadFrame->NpxFrame.ControlWord = 0x27F;
ThreadFrame->NpxFrame.StatusWord = 0;
ThreadFrame->NpxFrame.TagWord = 0xFFFF;
ThreadFrame->NpxFrame.ErrorOffset = 0;
ThreadFrame->NpxFrame.ErrorSelector = 0;
ThreadFrame->NpxFrame.ErrorOpcode = 0;
ThreadFrame->NpxFrame.DataOffset = 0;
ThreadFrame->NpxFrame.DataSelector = 0;
/* Clear DR6 and DR7 registers */
ThreadFrame->TrapFrame.Dr6 = 0;
ThreadFrame->TrapFrame.Dr7 = 0;
/* Set initial MXCSR register value */
ThreadFrame->TrapFrame.MxCsr = INITIAL_MXCSR;
/* Initialize exception frame */
ThreadFrame->ExceptionFrame.P1Home = (ULONG64)StartContext;
ThreadFrame->ExceptionFrame.P2Home = (ULONG64)StartRoutine;
ThreadFrame->ExceptionFrame.P3Home = (ULONG64)SystemRoutine;
ThreadFrame->ExceptionFrame.P4Home = (ULONG64)SystemRoutine;
}
else
{
/* This is kernel mode thread */
Thread->PreviousMode = KernelMode;
/* Disable floating point state */
Thread->NpxState = 0;
/* Set thread startup frame return information */
ThreadFrame->StartFrame.Return = (ULONG64)NULL;
}
/* Initialize thread startup information */
ThreadFrame->StartFrame.P1Home = (ULONG64)StartContext;
ThreadFrame->StartFrame.P2Home = (ULONG64)StartRoutine;
ThreadFrame->StartFrame.P3Home = (ULONG64)SystemRoutine;
ThreadFrame->StartFrame.P4Home = (ULONG64)SystemRoutine;
/* Initialize switch frame */
ThreadFrame->SwitchFrame.Rbp = (ULONG64)&ThreadFrame->TrapFrame + 128;
ThreadFrame->SwitchFrame.MxCsr = INITIAL_MXCSR;
/* Set thread stack */
Thread->InitialStack = &ThreadFrame->NpxFrame;
Thread->KernelStack = &ThreadFrame->SwitchFrame;
}