eersoy93/exectos
1
0
Fork 0
forked from xt-sys/exectos
Code Pull Requests Activity

Fixes in i686 version of KepInitializeThreadContext()

Browse Source
This commit is contained in:
Rafal Kupiec
2023-11-08 16:06:01 +01:00
parent 07998cafd4
commit 641b34b119
3 changed files with 32 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
xtoskrnl/ke/i686/kthread.c
View File

@@ -40,13 +40,13 @@ KepInitializeThreadContext(IN PKTHREAD Thread,
IN PCONTEXT ContextRecord)
{
PKTHREAD_INIT_FRAME ThreadFrame;
PSIMD_SAVE_AREA SimdSaveArea;
PFX_SAVE_FORMAT FxSaveFormat;
/* Set initial thread frame */
ThreadFrame = (PKTHREAD_INIT_FRAME)Thread->InitialStack - sizeof(KTHREAD_INIT_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));
RtlZeroMemory(&ThreadFrame->NpxFrame, sizeof(FX_SAVE_AREA));
/* Check if context provided for this thread */
if(ContextRecord)
@@ -58,19 +58,20 @@ KepInitializeThreadContext(IN PKTHREAD Thread,
ContextRecord->ContextFlags &= ~CONTEXT_DEBUG_REGISTERS | CONTEXT_CONTROL;
/* This is user mode thread */
ThreadFrame->StartFrame.UserMode = TRUE;
Thread->PreviousMode = UserMode;
/* Disable coprocessor floating point state */
Thread->NpxState = CR0_TS | CR0_MP;
Thread->NpxState = NPX_STATE_UNLOADED;
Thread->Header.NpxIrql = PASSIVE_LEVEL;
/* Set initial floating point state */
FxSaveFormat = (PFX_SAVE_FORMAT)ContextRecord->ExtendedRegisters;
FxSaveFormat->ControlWord = 0x27F;
FxSaveFormat->MxCsr = 0x1F80;
ContextRecord->FloatSave.Cr0NpxState = 0;
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;
@@ -84,23 +85,24 @@ KepInitializeThreadContext(IN PKTHREAD Thread,
ThreadFrame->TrapFrame.SegEs |= RPL_MASK;
ThreadFrame->TrapFrame.HardwareSegSs |= RPL_MASK;
/* Set kernel mode thread in the trap frame */
/* Set debug mark in the trap frame */
ThreadFrame->TrapFrame.DbgMark = 0x8BADF00D;
/* Set user mode thread in the trap frame */
ThreadFrame->TrapFrame.PreviousMode = UserMode;
}
else
{
/* This is kernel mode thread */
ThreadFrame->StartFrame.UserMode = FALSE;
Thread->PreviousMode = KernelMode;
/* Disable coprocessor floating point state */
Thread->NpxState = CR0_TS | CR0_MP;
Thread->NpxState = NPX_STATE_UNLOADED;
/* 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 */
@@ -109,6 +111,7 @@ KepInitializeThreadContext(IN PKTHREAD Thread,
ThreadFrame->StartFrame.SystemRoutine = SystemRoutine;
/* Initialize switch frame */
ThreadFrame->SwitchFrame.ApcBypassDisabled = TRUE;
ThreadFrame->SwitchFrame.ExceptionList = (PEXCEPTION_REGISTRATION_RECORD) - 1;
/* Set thread stack */