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reactos/ntoskrnl/ke/i386/traphdlr.c
Hermès Bélusca-Maïto 9919d4fa10 Sync to trunk r65566. 
svn path=/branches/condrv_restructure/; revision=65567
2014-12-05 21:20:35 +00:00

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/*
* PROJECT: ReactOS Kernel
* LICENSE: BSD - See COPYING.ARM in the top level directory
* FILE: ntoskrnl/ke/i386/traphdlr.c
* PURPOSE: Kernel Trap Handlers
* PROGRAMMERS: ReactOS Portable Systems Group
*/
/* INCLUDES *******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
VOID KiFastCallEntry(VOID);
VOID KiFastCallEntryWithSingleStep(VOID);
/* GLOBALS ********************************************************************/
UCHAR KiTrapPrefixTable[] =
{
0xF2, /* REP */
0xF3, /* REP INS/OUTS */
0x67, /* ADDR */
0xF0, /* LOCK */
0x66, /* OP */
0x2E, /* SEG */
0x3E, /* DS */
0x26, /* ES */
0x64, /* FS */
0x65, /* GS */
0x36, /* SS */
};
UCHAR KiTrapIoTable[] =
{
0xE4, /* IN */
0xE5, /* IN */
0xEC, /* IN */
0xED, /* IN */
0x6C, /* INS */
0x6D, /* INS */
0xE6, /* OUT */
0xE7, /* OUT */
0xEE, /* OUT */
0xEF, /* OUT */
0x6E, /* OUTS */
0x6F, /* OUTS */
};
PFAST_SYSTEM_CALL_EXIT KiFastCallExitHandler;
#if DBG && !defined(_WINKD_)
PKDBG_PRESERVICEHOOK KeWin32PreServiceHook = NULL;
PKDBG_POSTSERVICEHOOK KeWin32PostServiceHook = NULL;
#endif
#if TRAP_DEBUG
BOOLEAN StopChecking = FALSE;
#endif
/* TRAP EXIT CODE *************************************************************/
FORCEINLINE
BOOLEAN
KiVdmTrap(IN PKTRAP_FRAME TrapFrame)
{
/* Either the V8086 flag is on, or this is user-mode with a VDM */
return ((TrapFrame->EFlags & EFLAGS_V86_MASK) ||
((KiUserTrap(TrapFrame)) && (PsGetCurrentProcess()->VdmObjects)));
}
FORCEINLINE
BOOLEAN
KiV86Trap(IN PKTRAP_FRAME TrapFrame)
{
/* Check if the V8086 flag is on */
return ((TrapFrame->EFlags & EFLAGS_V86_MASK) != 0);
}
FORCEINLINE
BOOLEAN
KiIsFrameEdited(IN PKTRAP_FRAME TrapFrame)
{
/* An edited frame changes esp. It is marked by clearing the bits
defined by FRAME_EDITED in the SegCs field of the trap frame */
return ((TrapFrame->SegCs & FRAME_EDITED) == 0);
}
FORCEINLINE
VOID
KiCommonExit(IN PKTRAP_FRAME TrapFrame, BOOLEAN SkipPreviousMode)
{
/* Disable interrupts until we return */
_disable();
/* Check for APC delivery */
KiCheckForApcDelivery(TrapFrame);
/* Restore the SEH handler chain */
KeGetPcr()->NtTib.ExceptionList = TrapFrame->ExceptionList;
/* Check if there are active debug registers */
if (__builtin_expect(TrapFrame->Dr7 & ~DR7_RESERVED_MASK, 0))
{
/* Check if the frame was from user mode or v86 mode */
if (KiUserTrap(TrapFrame) ||
(TrapFrame->EFlags & EFLAGS_V86_MASK))
{
/* Handle debug registers */
KiHandleDebugRegistersOnTrapExit(TrapFrame);
}
}
/* Debugging checks */
KiExitTrapDebugChecks(TrapFrame, SkipPreviousMode);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiEoiHelper(IN PKTRAP_FRAME TrapFrame)
{
/* Common trap exit code */
KiCommonExit(TrapFrame, TRUE);
/* Check if this was a V8086 trap */
if (TrapFrame->EFlags & EFLAGS_V86_MASK) KiTrapReturnNoSegments(TrapFrame);
/* Check for user mode exit */
if (KiUserTrap(TrapFrame)) KiTrapReturn(TrapFrame);
/* Check for edited frame */
if (KiIsFrameEdited(TrapFrame)) KiEditedTrapReturn(TrapFrame);
/* Check if we have single stepping enabled */
if (TrapFrame->EFlags & EFLAGS_TF) KiTrapReturnNoSegments(TrapFrame);
/* Exit the trap to kernel mode */
KiTrapReturnNoSegmentsRet8(TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiServiceExit(IN PKTRAP_FRAME TrapFrame,
IN NTSTATUS Status)
{
ASSERT((TrapFrame->EFlags & EFLAGS_V86_MASK) == 0);
ASSERT(!KiIsFrameEdited(TrapFrame));
/* Copy the status into EAX */
TrapFrame->Eax = Status;
/* Common trap exit code */
KiCommonExit(TrapFrame, FALSE);
/* Restore previous mode */
KeGetCurrentThread()->PreviousMode = (CCHAR)TrapFrame->PreviousPreviousMode;
/* Check for user mode exit */
if (KiUserTrap(TrapFrame))
{
/* Check if we were single stepping */
if (TrapFrame->EFlags & EFLAGS_TF)
{
/* Must use the IRET handler */
KiSystemCallTrapReturn(TrapFrame);
}
else
{
/* We can use the sysexit handler */
KiFastCallExitHandler(TrapFrame);
}
}
/* Exit to kernel mode */
KiSystemCallReturn(TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiServiceExit2(IN PKTRAP_FRAME TrapFrame)
{
/* Common trap exit code */
KiCommonExit(TrapFrame, FALSE);
/* Restore previous mode */
KeGetCurrentThread()->PreviousMode = (CCHAR)TrapFrame->PreviousPreviousMode;
/* Check if this was a V8086 trap */
if (TrapFrame->EFlags & EFLAGS_V86_MASK) KiTrapReturnNoSegments(TrapFrame);
/* Check for user mode exit */
if (KiUserTrap(TrapFrame)) KiTrapReturn(TrapFrame);
/* Check for edited frame */
if (KiIsFrameEdited(TrapFrame)) KiEditedTrapReturn(TrapFrame);
/* Check if we have single stepping enabled */
if (TrapFrame->EFlags & EFLAGS_TF) KiTrapReturnNoSegments(TrapFrame);
/* Exit the trap to kernel mode */
KiTrapReturnNoSegmentsRet8(TrapFrame);
}
/* TRAP HANDLERS **************************************************************/
DECLSPEC_NORETURN
VOID
FASTCALL
KiDebugHandler(IN PKTRAP_FRAME TrapFrame,
IN ULONG Parameter1,
IN ULONG Parameter2,
IN ULONG Parameter3)
{
/* Check for VDM trap */
ASSERT((KiVdmTrap(TrapFrame)) == FALSE);
/* Enable interrupts if the trap came from user-mode */
if (KiUserTrap(TrapFrame)) _enable();
/* Dispatch the exception */
KiDispatchExceptionFromTrapFrame(STATUS_BREAKPOINT,
0,
TrapFrame->Eip - 1,
3,
Parameter1,
Parameter2,
Parameter3,
TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiNpxHandler(IN PKTRAP_FRAME TrapFrame,
IN PKTHREAD Thread,
IN PFX_SAVE_AREA SaveArea)
{
ULONG Cr0, Mask, Error, ErrorOffset, DataOffset;
/* Check for VDM trap */
ASSERT((KiVdmTrap(TrapFrame)) == FALSE);
/* Check for kernel trap */
if (!KiUserTrap(TrapFrame))
{
/* Kernel might've tripped a delayed error */
SaveArea->Cr0NpxState |= CR0_TS;
/* Only valid if it happened during a restore */
//if ((PVOID)TrapFrame->Eip == FrRestore)
{
/* It did, so just skip the instruction */
//TrapFrame->Eip += 3; /* sizeof(FRSTOR) */
//KiEoiHelper(TrapFrame);
}
}
/* User or kernel trap -- get ready to issue an exception */
//if (Thread->NpxState == NPX_STATE_NOT_LOADED)
{
/* Update CR0 */
Cr0 = __readcr0();
Cr0 &= ~(CR0_MP | CR0_EM | CR0_TS);
__writecr0(Cr0);
/* Save FPU state */
Ke386SaveFpuState(SaveArea);
/* Mark CR0 state dirty */
Cr0 |= NPX_STATE_NOT_LOADED;
Cr0 |= SaveArea->Cr0NpxState;
__writecr0(Cr0);
/* Update NPX state */
Thread->NpxState = NPX_STATE_NOT_LOADED;
KeGetCurrentPrcb()->NpxThread = NULL;
}
/* Clear the TS bit and re-enable interrupts */
SaveArea->Cr0NpxState &= ~CR0_TS;
_enable();
/* Check if we should get the FN or FX error */
if (KeI386FxsrPresent)
{
/* Get it from FX */
Mask = SaveArea->U.FxArea.ControlWord;
Error = SaveArea->U.FxArea.StatusWord;
/* Get the FPU exception address too */
ErrorOffset = SaveArea->U.FxArea.ErrorOffset;
DataOffset = SaveArea->U.FxArea.DataOffset;
}
else
{
/* Get it from FN */
Mask = SaveArea->U.FnArea.ControlWord;
Error = SaveArea->U.FnArea.StatusWord;
/* Get the FPU exception address too */
ErrorOffset = SaveArea->U.FnArea.ErrorOffset;
DataOffset = SaveArea->U.FnArea.DataOffset;
}
/* Get legal exceptions that software should handle */
/* We do this by first masking off from the Mask the bits we need, */
/* This is done so we can keep the FSW_STACK_FAULT bit in Error. */
Mask &= (FSW_INVALID_OPERATION |
FSW_DENORMAL |
FSW_ZERO_DIVIDE |
FSW_OVERFLOW |
FSW_UNDERFLOW |
FSW_PRECISION);
Error &= ~Mask;
/* Check for invalid operation */
if (Error & FSW_INVALID_OPERATION)
{
/* NOTE: Stack fault is handled differently than any other case. */
/* 1. It's only raised for invalid operation. */
/* 2. It's only raised if invalid operation is not masked. */
if (Error & FSW_STACK_FAULT)
{
/* Issue stack check fault */
KiDispatchException2Args(STATUS_FLOAT_STACK_CHECK,
ErrorOffset,
0,
DataOffset,
TrapFrame);
}
/* Issue fault */
KiDispatchException1Args(STATUS_FLOAT_INVALID_OPERATION,
ErrorOffset,
0,
TrapFrame);
}
/* Check for divide by zero */
if (Error & FSW_ZERO_DIVIDE)
{
/* Issue fault */
KiDispatchException1Args(STATUS_FLOAT_DIVIDE_BY_ZERO,
ErrorOffset,
0,
TrapFrame);
}
/* Check for denormal */
if (Error & FSW_DENORMAL)
{
/* Issue fault */
KiDispatchException1Args(STATUS_FLOAT_INVALID_OPERATION,
ErrorOffset,
0,
TrapFrame);
}
/* Check for overflow */
if (Error & FSW_OVERFLOW)
{
/* Issue fault */
KiDispatchException1Args(STATUS_FLOAT_OVERFLOW,
ErrorOffset,
0,
TrapFrame);
}
/* Check for underflow */
if (Error & FSW_UNDERFLOW)
{
/* Issue fault */
KiDispatchException1Args(STATUS_FLOAT_UNDERFLOW,
ErrorOffset,
0,
TrapFrame);
}
/* Check for precision fault */
if (Error & FSW_PRECISION)
{
/* Issue fault */
KiDispatchException1Args(STATUS_FLOAT_INEXACT_RESULT,
ErrorOffset,
0,
TrapFrame);
}
/* Unknown FPU fault */
KeBugCheckWithTf(TRAP_CAUSE_UNKNOWN, 1, Error, 0, 0, TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap00Handler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Check for VDM trap */
ASSERT((KiVdmTrap(TrapFrame)) == FALSE);
/* Enable interrupts */
_enable();
/* Dispatch the exception */
KiDispatchException0Args(STATUS_INTEGER_DIVIDE_BY_ZERO,
TrapFrame->Eip,
TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap01Handler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Check for VDM trap */
ASSERT((KiVdmTrap(TrapFrame)) == FALSE);
/* Check if this was a single step after sysenter */
if (TrapFrame->Eip == (ULONG)KiFastCallEntry)
{
/* Disable single stepping */
TrapFrame->EFlags &= ~EFLAGS_TF;
/* Re-enter at the alternative sysenter entry point */
TrapFrame->Eip = (ULONG)KiFastCallEntryWithSingleStep;
/* End this trap */
KiEoiHelper(TrapFrame);
}
/* Enable interrupts if the trap came from user-mode */
if (KiUserTrap(TrapFrame)) _enable();
/* Mask out trap flag and dispatch the exception */
TrapFrame->EFlags &= ~EFLAGS_TF;
KiDispatchException0Args(STATUS_SINGLE_STEP,
TrapFrame->Eip,
TrapFrame);
}
DECLSPEC_NORETURN
VOID
__cdecl
KiTrap02(VOID)
{
PKTSS Tss, NmiTss;
PKTHREAD Thread;
PKPROCESS Process;
PKGDTENTRY TssGdt;
KTRAP_FRAME TrapFrame;
KIRQL OldIrql;
//
// In some sort of strange recursion case, we might end up here with the IF
// flag incorrectly on the interrupt frame -- during a normal NMI this would
// normally already be set.
//
// For sanity's sake, make sure interrupts are disabled for sure.
// NMIs will already be since the CPU does it for us.
//
_disable();
//
// Get the current TSS, thread, and process
//
Tss = PCR->TSS;
Thread = ((PKIPCR)PCR)->PrcbData.CurrentThread;
Process = Thread->ApcState.Process;
//
// Save data usually not in the TSS
//
Tss->CR3 = Process->DirectoryTableBase[0];
Tss->IoMapBase = Process->IopmOffset;
Tss->LDT = Process->LdtDescriptor.LimitLow ? KGDT_LDT : 0;
//
// Now get the base address of the NMI TSS
//
TssGdt = &((PKIPCR)KeGetPcr())->GDT[KGDT_NMI_TSS / sizeof(KGDTENTRY)];
NmiTss = (PKTSS)(ULONG_PTR)(TssGdt->BaseLow |
TssGdt->HighWord.Bytes.BaseMid << 16 |
TssGdt->HighWord.Bytes.BaseHi << 24);
//
// Switch to it and activate it, masking off the nested flag
//
// Note that in reality, we are already on the NMI tss -- we just need to
// update the PCR to reflect this
//
PCR->TSS = NmiTss;
__writeeflags(__readeflags() &~ EFLAGS_NESTED_TASK);
TssGdt->HighWord.Bits.Dpl = 0;
TssGdt->HighWord.Bits.Pres = 1;
TssGdt->HighWord.Bits.Type = I386_TSS;
//
// Now build the trap frame based on the original TSS
//
// The CPU does a hardware "Context switch" / task switch of sorts and so it
// takes care of saving our context in the normal TSS.
//
// We just have to go get the values...
//
RtlZeroMemory(&TrapFrame, sizeof(KTRAP_FRAME));
TrapFrame.HardwareSegSs = Tss->Ss0;
TrapFrame.HardwareEsp = Tss->Esp0;
TrapFrame.EFlags = Tss->EFlags;
TrapFrame.SegCs = Tss->Cs;
TrapFrame.Eip = Tss->Eip;
TrapFrame.Ebp = Tss->Ebp;
TrapFrame.Ebx = Tss->Ebx;
TrapFrame.Esi = Tss->Esi;
TrapFrame.Edi = Tss->Edi;
TrapFrame.SegFs = Tss->Fs;
TrapFrame.ExceptionList = PCR->NtTib.ExceptionList;
TrapFrame.PreviousPreviousMode = -1;
TrapFrame.Eax = Tss->Eax;
TrapFrame.Ecx = Tss->Ecx;
TrapFrame.Edx = Tss->Edx;
TrapFrame.SegDs = Tss->Ds;
TrapFrame.SegEs = Tss->Es;
TrapFrame.SegGs = Tss->Gs;
TrapFrame.DbgEip = Tss->Eip;
TrapFrame.DbgEbp = Tss->Ebp;
//
// Store the trap frame in the KPRCB
//
KiSaveProcessorState(&TrapFrame, NULL);
//
// Call any registered NMI handlers and see if they handled it or not
//
if (!KiHandleNmi())
{
//
// They did not, so call the platform HAL routine to bugcheck the system
//
// Make sure the HAL believes it's running at HIGH IRQL... we can't use
// the normal APIs here as playing with the IRQL could change the system
// state
//
OldIrql = PCR->Irql;
PCR->Irql = HIGH_LEVEL;
HalHandleNMI(NULL);
PCR->Irql = OldIrql;
}
//
// Although the CPU disabled NMIs, we just did a BIOS Call, which could've
// totally changed things.
//
// We have to make sure we're still in our original NMI -- a nested NMI
// will point back to the NMI TSS, and in that case we're hosed.
//
if (PCR->TSS->Backlink != KGDT_NMI_TSS)
{
//
// Restore original TSS
//
PCR->TSS = Tss;
//
// Set it back to busy
//
TssGdt->HighWord.Bits.Dpl = 0;
TssGdt->HighWord.Bits.Pres = 1;
TssGdt->HighWord.Bits.Type = I386_ACTIVE_TSS;
//
// Restore nested flag
//
__writeeflags(__readeflags() | EFLAGS_NESTED_TASK);
//
// Handled, return from interrupt
//
KiIret();
}
//
// Unhandled: crash the system
//
KiSystemFatalException(EXCEPTION_NMI, NULL);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap03Handler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Continue with the common handler */
KiDebugHandler(TrapFrame, BREAKPOINT_BREAK, 0, 0);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap04Handler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Check for VDM trap */
ASSERT((KiVdmTrap(TrapFrame)) == FALSE);
/* Enable interrupts */
_enable();
/* Dispatch the exception */
KiDispatchException0Args(STATUS_INTEGER_OVERFLOW,
TrapFrame->Eip - 1,
TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap05Handler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Check for VDM trap */
ASSERT((KiVdmTrap(TrapFrame)) == FALSE);
/* Check for kernel-mode fault */
if (!KiUserTrap(TrapFrame)) KiSystemFatalException(EXCEPTION_BOUND_CHECK, TrapFrame);
/* Enable interrupts */
_enable();
/* Dispatch the exception */
KiDispatchException0Args(STATUS_ARRAY_BOUNDS_EXCEEDED,
TrapFrame->Eip,
TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap06Handler(IN PKTRAP_FRAME TrapFrame)
{
PUCHAR Instruction;
ULONG i;
KIRQL OldIrql;
/* Check for V86 GPF */
if (__builtin_expect(KiV86Trap(TrapFrame), 1))
{
/* Enter V86 trap */
KiEnterV86Trap(TrapFrame);
/* Must be a VDM process */
if (__builtin_expect(!PsGetCurrentProcess()->VdmObjects, 0))
{
/* Enable interrupts */
_enable();
/* Setup illegal instruction fault */
KiDispatchException0Args(STATUS_ILLEGAL_INSTRUCTION,
TrapFrame->Eip,
TrapFrame);
}
/* Go to APC level */
OldIrql = KfRaiseIrql(APC_LEVEL);
_enable();
/* Check for BOP */
if (!VdmDispatchBop(TrapFrame))
{
/* Should only happen in VDM mode */
UNIMPLEMENTED_FATAL();
}
/* Bring IRQL back */
KfLowerIrql(OldIrql);
_disable();
/* Do a quick V86 exit if possible */
KiExitV86Trap(TrapFrame);
}
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Enable interrupts */
Instruction = (PUCHAR)TrapFrame->Eip;
_enable();
/* Check for user trap */
if (KiUserTrap(TrapFrame))
{
/* FIXME: Use SEH */
/* Scan next 4 opcodes */
for (i = 0; i < 4; i++)
{
/* Check for LOCK instruction */
if (Instruction[i] == 0xF0)
{
/* Send invalid lock sequence exception */
KiDispatchException0Args(STATUS_INVALID_LOCK_SEQUENCE,
TrapFrame->Eip,
TrapFrame);
}
}
/* FIXME: SEH ends here */
}
/* Kernel-mode or user-mode fault (but not LOCK) */
KiDispatchException0Args(STATUS_ILLEGAL_INSTRUCTION,
TrapFrame->Eip,
TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap07Handler(IN PKTRAP_FRAME TrapFrame)
{
PKTHREAD Thread, NpxThread;
PFX_SAVE_AREA SaveArea, NpxSaveArea;
ULONG Cr0;
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Try to handle NPX delay load */
while (TRUE)
{
/* Get the current thread */
Thread = KeGetCurrentThread();
/* Get the NPX frame */
SaveArea = KiGetThreadNpxArea(Thread);
/* Check if emulation is enabled */
if (SaveArea->Cr0NpxState & CR0_EM)
{
/* Not implemented */
UNIMPLEMENTED_FATAL();
}
/* Save CR0 and check NPX state */
Cr0 = __readcr0();
if (Thread->NpxState != NPX_STATE_LOADED)
{
/* Update CR0 */
Cr0 &= ~(CR0_MP | CR0_EM | CR0_TS);
__writecr0(Cr0);
/* Get the NPX thread */
NpxThread = KeGetCurrentPrcb()->NpxThread;
if (NpxThread)
{
/* Get the NPX frame */
NpxSaveArea = KiGetThreadNpxArea(NpxThread);
/* Save FPU state */
DPRINT("FIXME: Save FPU state: %p\n", NpxSaveArea);
//Ke386SaveFpuState(NpxSaveArea);
/* Update NPX state */
NpxThread->NpxState = NPX_STATE_NOT_LOADED;
}
/* Load FPU state */
//Ke386LoadFpuState(SaveArea);
/* Update NPX state */
Thread->NpxState = NPX_STATE_LOADED;
KeGetCurrentPrcb()->NpxThread = Thread;
/* Enable interrupts */
_enable();
/* Check if CR0 needs to be reloaded due to context switch */
if (!SaveArea->Cr0NpxState) KiEoiHelper(TrapFrame);
/* Otherwise, we need to reload CR0, disable interrupts */
_disable();
/* Reload CR0 */
Cr0 = __readcr0();
Cr0 |= SaveArea->Cr0NpxState;
__writecr0(Cr0);
/* Now restore interrupts and check for TS */
_enable();
if (Cr0 & CR0_TS) KiEoiHelper(TrapFrame);
/* We're still here -- clear TS and try again */
__writecr0(__readcr0() &~ CR0_TS);
_disable();
}
else
{
/* This is an actual fault, not a lack of FPU state */
break;
}
}
/* TS should not be set */
if (Cr0 & CR0_TS)
{
/*
* If it's incorrectly set, then maybe the state is actually still valid
* but we could've lock track of that due to a BIOS call.
* Make sure MP is still set, which should verify the theory.
*/
if (Cr0 & CR0_MP)
{
/* Indeed, the state is actually still valid, so clear TS */
__writecr0(__readcr0() &~ CR0_TS);
KiEoiHelper(TrapFrame);
}
/* Otherwise, something strange is going on */
KeBugCheckWithTf(TRAP_CAUSE_UNKNOWN, 2, Cr0, 0, 0, TrapFrame);
}
/* It's not a delayed load, so process this trap as an NPX fault */
KiNpxHandler(TrapFrame, Thread, SaveArea);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap08Handler(IN PKTRAP_FRAME TrapFrame)
{
/* FIXME: Not handled */
KiSystemFatalException(EXCEPTION_DOUBLE_FAULT, TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap09Handler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Enable interrupts and kill the system */
_enable();
KiSystemFatalException(EXCEPTION_NPX_OVERRUN, TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap0AHandler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Check for VDM trap */
ASSERT((KiVdmTrap(TrapFrame)) == FALSE);
/* Kill the system */
KiSystemFatalException(EXCEPTION_INVALID_TSS, TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap0BHandler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* FIXME: Kill the system */
UNIMPLEMENTED;
KiSystemFatalException(EXCEPTION_SEGMENT_NOT_PRESENT, TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap0CHandler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* FIXME: Kill the system */
UNIMPLEMENTED;
KiSystemFatalException(EXCEPTION_STACK_FAULT, TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap0DHandler(IN PKTRAP_FRAME TrapFrame)
{
ULONG i, j, Iopl;
BOOLEAN Privileged = FALSE;
PUCHAR Instructions;
UCHAR Instruction = 0;
KIRQL OldIrql;
/* Check for V86 GPF */
if (__builtin_expect(KiV86Trap(TrapFrame), 1))
{
/* Enter V86 trap */
KiEnterV86Trap(TrapFrame);
/* Must be a VDM process */
if (__builtin_expect(!PsGetCurrentProcess()->VdmObjects, 0))
{
/* Enable interrupts */
_enable();
/* Setup illegal instruction fault */
KiDispatchException0Args(STATUS_ILLEGAL_INSTRUCTION,
TrapFrame->Eip,
TrapFrame);
}
/* Go to APC level */
OldIrql = KfRaiseIrql(APC_LEVEL);
_enable();
/* Handle the V86 opcode */
if (__builtin_expect(Ki386HandleOpcodeV86(TrapFrame) == 0xFF, 0))
{
/* Should only happen in VDM mode */
UNIMPLEMENTED_FATAL();
}
/* Bring IRQL back */
KfLowerIrql(OldIrql);
_disable();
/* Do a quick V86 exit if possible */
KiExitV86Trap(TrapFrame);
}
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Check for user-mode GPF */
if (KiUserTrap(TrapFrame))
{
/* Should not be VDM */
ASSERT(KiVdmTrap(TrapFrame) == FALSE);
/* Enable interrupts and check error code */
_enable();
if (!TrapFrame->ErrCode)
{
/* FIXME: Use SEH */
Instructions = (PUCHAR)TrapFrame->Eip;
/* Scan next 15 bytes */
for (i = 0; i < 15; i++)
{
/* Skip prefix instructions */
for (j = 0; j < sizeof(KiTrapPrefixTable); j++)
{
/* Is this a prefix instruction? */
if (Instructions[i] == KiTrapPrefixTable[j])
{
/* Stop looking */
break;
}
}
/* Is this NOT any prefix instruction? */
if (j == sizeof(KiTrapPrefixTable))
{
/* We can go ahead and handle the fault now */
Instruction = Instructions[i];
break;
}
}
/* If all we found was prefixes, then this instruction is too long */
if (i == 15)
{
/* Setup illegal instruction fault */
KiDispatchException0Args(STATUS_ILLEGAL_INSTRUCTION,
TrapFrame->Eip,
TrapFrame);
}
/* Check for privileged instructions */
DPRINT("Instruction (%lu) at fault: %lx %lx %lx %lx\n",
i,
Instructions[i],
Instructions[i + 1],
Instructions[i + 2],
Instructions[i + 3]);
if (Instruction == 0xF4) // HLT
{
/* HLT is privileged */
Privileged = TRUE;
}
else if (Instruction == 0x0F)
{
/* Test if it's any of the privileged two-byte opcodes */
if (((Instructions[i + 1] == 0x00) && // LLDT or LTR
(((Instructions[i + 2] & 0x38) == 0x10) || // LLDT
(Instructions[i + 2] == 0x18))) || // LTR
((Instructions[i + 1] == 0x01) && // LGDT or LIDT or LMSW
(((Instructions[i + 2] & 0x38) == 0x10) || // LGDT
(Instructions[i + 2] == 0x18) || // LIDT
(Instructions[i + 2] == 0x30))) || // LMSW
(Instructions[i + 1] == 0x08) || // INVD
(Instructions[i + 1] == 0x09) || // WBINVD
(Instructions[i + 1] == 0x35) || // SYSEXIT
(Instructions[i + 1] == 0x21) || // MOV DR, XXX
(Instructions[i + 1] == 0x06) || // CLTS
(Instructions[i + 1] == 0x20) || // MOV CR, XXX
(Instructions[i + 1] == 0x22) || // MOV XXX, CR
(Instructions[i + 1] == 0x23) || // MOV YYY, DR
(Instructions[i + 1] == 0x30) || // WRMSR
(Instructions[i + 1] == 0x33)) // RDPMC
// INVLPG, INVLPGA, SYSRET
{
/* These are all privileged */
Privileged = TRUE;
}
}
else
{
/* Get the IOPL and compare with the RPL mask */
Iopl = (TrapFrame->EFlags & EFLAGS_IOPL) >> 12;
if ((TrapFrame->SegCs & RPL_MASK) > Iopl)
{
/* I/O privilege error -- check for known instructions */
if ((Instruction == 0xFA) || (Instruction == 0xFB)) // CLI or STI
{
/* These are privileged */
Privileged = TRUE;
}
else
{
/* Last hope: an IN/OUT instruction */
for (j = 0; j < sizeof(KiTrapIoTable); j++)
{
/* Is this an I/O instruction? */
if (Instruction == KiTrapIoTable[j])
{
/* Then it's privileged */
Privileged = TRUE;
break;
}
}
}
}
}
/* So now... was the instruction privileged or not? */
if (Privileged)
{
/* Whew! We have a privileged instruction, so dispatch the fault */
KiDispatchException0Args(STATUS_PRIVILEGED_INSTRUCTION,
TrapFrame->Eip,
TrapFrame);
}
}
/* If we got here, send an access violation */
KiDispatchException2Args(STATUS_ACCESS_VIOLATION,
TrapFrame->Eip,
0,
0xFFFFFFFF,
TrapFrame);
}
/*
* Check for a fault during checking of the user instruction.
*
* Note that the SEH handler will catch invalid EIP, but we could be dealing
* with an invalid CS, which will generate another GPF instead.
*
*/
if (((PVOID)TrapFrame->Eip >= (PVOID)KiTrap0DHandler) &&
((PVOID)TrapFrame->Eip < (PVOID)KiTrap0DHandler))
{
/* Not implemented */
UNIMPLEMENTED_FATAL();
}
/*
* NOTE: The ASM trap exit code would restore segment registers by doing
* a POP <SEG>, which could cause an invalid segment if someone had messed
* with the segment values.
*
* Another case is a bogus SS, which would hit a GPF when doing the iret.
* This could only be done through a buggy or malicious driver, or perhaps
* the kernel debugger.
*
* The kernel normally restores the "true" segment if this happens.
*
* However, since we're restoring in C, not ASM, we can't detect
* POP <SEG> since the actual instructions will be different.
*
* A better technique would be to check the EIP and somehow edit the
* trap frame before restarting the instruction -- but we would need to
* know the extract instruction that was used first.
*
* We could force a special instrinsic to use stack instructions, or write
* a simple instruction length checker.
*
* Nevertheless, this is a lot of work for the purpose of avoiding a crash
* when the user is purposedly trying to create one from kernel-mode, so
* we should probably table this for now since it's not a "real" issue.
*/
/*
* NOTE2: Another scenario is the IRET during a V8086 restore (BIOS Call)
* which will cause a GPF since the trap frame is a total mess (on purpose)
* as built in KiEnterV86Mode.
*
* The idea is to scan for IRET, scan for the known EIP adress, validate CS
* and then manually issue a jump to the V8086 return EIP.
*/
Instructions = (PUCHAR)TrapFrame->Eip;
if (Instructions[0] == 0xCF)
{
/*
* Some evil shit is going on here -- this is not the SS:ESP you're
* looking for! Instead, this is actually CS:EIP you're looking at!
* Why? Because part of the trap frame actually corresponds to the IRET
* stack during the trap exit!
*/
if ((TrapFrame->HardwareEsp == (ULONG)Ki386BiosCallReturnAddress) &&
(TrapFrame->HardwareSegSs == (KGDT_R0_CODE | RPL_MASK)))
{
/* Exit the V86 trap! */
Ki386BiosCallReturnAddress(TrapFrame);
}
else
{
/* Otherwise, this is another kind of IRET fault */
UNIMPLEMENTED_FATAL();
}
}
/* So since we're not dealing with the above case, check for RDMSR/WRMSR */
if ((Instructions[0] == 0xF) && // 2-byte opcode
((Instructions[1] == 0x32) || // RDMSR
(Instructions[1] == 0x30))) // WRMSR
{
/* Unknown CPU MSR, so raise an access violation */
KiDispatchException0Args(STATUS_ACCESS_VIOLATION,
TrapFrame->Eip,
TrapFrame);
}
/* Check for lazy segment load */
if (TrapFrame->SegDs != (KGDT_R3_DATA | RPL_MASK))
{
/* Fix it */
TrapFrame->SegDs = (KGDT_R3_DATA | RPL_MASK);
}
else if (TrapFrame->SegEs != (KGDT_R3_DATA | RPL_MASK))
{
/* Fix it */
TrapFrame->SegEs = (KGDT_R3_DATA | RPL_MASK);
}
else
{
/* Whatever it is, we can't handle it */
KiSystemFatalException(EXCEPTION_GP_FAULT, TrapFrame);
}
/* Return to where we came from */
KiTrapReturn(TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap0EHandler(IN PKTRAP_FRAME TrapFrame)
{
PKTHREAD Thread;
ULONG_PTR Cr2;
NTSTATUS Status;
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Check if this is the base frame */
Thread = KeGetCurrentThread();
if (KeGetTrapFrame(Thread) != TrapFrame)
{
/* It isn't, check if this is a second nested frame */
if (((ULONG_PTR)KeGetTrapFrame(Thread) - (ULONG_PTR)TrapFrame) <=
FIELD_OFFSET(KTRAP_FRAME, EFlags))
{
/* The stack is somewhere in between frames, we need to fix it */
UNIMPLEMENTED_FATAL();
}
}
/* Save CR2 */
Cr2 = __readcr2();
/* Enable interupts */
_enable();
/* Check if we came in with interrupts disabled */
if (!(TrapFrame->EFlags & EFLAGS_INTERRUPT_MASK))
{
/* This is completely illegal, bugcheck the system */
KeBugCheckWithTf(IRQL_NOT_LESS_OR_EQUAL,
Cr2,
-1,
TrapFrame->ErrCode & 2 ? TRUE : FALSE,
TrapFrame->Eip,
TrapFrame);
}
/* Check for S-LIST fault in kernel mode */
if (TrapFrame->Eip == (ULONG_PTR)ExpInterlockedPopEntrySListFault)
{
PSLIST_HEADER SListHeader;
/* Sanity check that the assembly is correct:
This must be mov ebx, [eax]
Followed by cmpxchg8b [ebp] */
ASSERT((((UCHAR*)TrapFrame->Eip)[0] == 0x8B) &&
(((UCHAR*)TrapFrame->Eip)[1] == 0x18) &&
(((UCHAR*)TrapFrame->Eip)[2] == 0x0F) &&
(((UCHAR*)TrapFrame->Eip)[3] == 0xC7) &&
(((UCHAR*)TrapFrame->Eip)[4] == 0x4D) &&
(((UCHAR*)TrapFrame->Eip)[5] == 0x00));
/* Get the pointer to the SLIST_HEADER */
SListHeader = (PSLIST_HEADER)TrapFrame->Ebp;
/* Check if the Next member of the SLIST_HEADER was changed */
if (SListHeader->Next.Next != (PSLIST_ENTRY)TrapFrame->Eax)
{
/* Restart the operation */
TrapFrame->Eip = (ULONG_PTR)ExpInterlockedPopEntrySListResume;
/* Continue execution */
KiEoiHelper(TrapFrame);
}
else
{
#if 0
/* Do what windows does and issue an invalid access violation */
KiDispatchException2Args(KI_EXCEPTION_ACCESS_VIOLATION,
TrapFrame->Eip,
TrapFrame->ErrCode & 2 ? TRUE : FALSE,
Cr2,
TrapFrame);
#endif
}
}
/* Call the access fault handler */
Status = MmAccessFault(TrapFrame->ErrCode & 1,
(PVOID)Cr2,
KiUserTrap(TrapFrame),
TrapFrame);
if (NT_SUCCESS(Status)) KiEoiHelper(TrapFrame);
/* Check for syscall fault */
#if 0
if ((TrapFrame->Eip == (ULONG_PTR)CopyParams) ||
(TrapFrame->Eip == (ULONG_PTR)ReadBatch))
{
/* Not yet implemented */
UNIMPLEMENTED_FATAL();
}
#endif
/* Check for VDM trap */
ASSERT((KiVdmTrap(TrapFrame)) == FALSE);
/* Either kernel or user trap (non VDM) so dispatch exception */
if (Status == STATUS_ACCESS_VIOLATION)
{
/* This status code is repurposed so we can recognize it later */
KiDispatchException2Args(KI_EXCEPTION_ACCESS_VIOLATION,
TrapFrame->Eip,
TrapFrame->ErrCode & 2 ? TRUE : FALSE,
Cr2,
TrapFrame);
}
else if ((Status == STATUS_GUARD_PAGE_VIOLATION) ||
(Status == STATUS_STACK_OVERFLOW))
{
/* These faults only have two parameters */
KiDispatchException2Args(Status,
TrapFrame->Eip,
TrapFrame->ErrCode & 2 ? TRUE : FALSE,
Cr2,
TrapFrame);
}
/* Only other choice is an in-page error, with 3 parameters */
KiDispatchExceptionFromTrapFrame(STATUS_IN_PAGE_ERROR,
0,
TrapFrame->Eip,
3,
TrapFrame->ErrCode & 2 ? TRUE : FALSE,
Cr2,
Status,
TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap0FHandler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* FIXME: Kill the system */
UNIMPLEMENTED;
KiSystemFatalException(EXCEPTION_RESERVED_TRAP, TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap10Handler(IN PKTRAP_FRAME TrapFrame)
{
PKTHREAD Thread;
PFX_SAVE_AREA SaveArea;
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Check if this is the NPX thrad */
Thread = KeGetCurrentThread();
SaveArea = KiGetThreadNpxArea(Thread);
if (Thread != KeGetCurrentPrcb()->NpxThread)
{
/* It isn't, enable interrupts and set delayed error */
_enable();
SaveArea->Cr0NpxState |= CR0_TS;
/* End trap */
KiEoiHelper(TrapFrame);
}
/* Otherwise, proceed with NPX fault handling */
KiNpxHandler(TrapFrame, Thread, SaveArea);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap11Handler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Enable interrupts and kill the system */
_enable();
KiSystemFatalException(EXCEPTION_ALIGNMENT_CHECK, TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiTrap13Handler(IN PKTRAP_FRAME TrapFrame)
{
PKTHREAD Thread;
PFX_SAVE_AREA SaveArea;
ULONG Cr0, MxCsrMask, Error;
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Check if this is the NPX thrad */
Thread = KeGetCurrentThread();
if (Thread != KeGetCurrentPrcb()->NpxThread)
{
/* It isn't, kill the system */
KeBugCheckWithTf(TRAP_CAUSE_UNKNOWN, 13, (ULONG_PTR)Thread, 0, 0, TrapFrame);
}
/* Get the NPX frame */
SaveArea = KiGetThreadNpxArea(Thread);
/* Check for VDM trap */
ASSERT((KiVdmTrap(TrapFrame)) == FALSE);
/* Check for user trap */
if (!KiUserTrap(TrapFrame))
{
/* Kernel should not fault on XMMI */
KeBugCheckWithTf(TRAP_CAUSE_UNKNOWN, 13, 0, 0, 2, TrapFrame);
}
/* Update CR0 */
Cr0 = __readcr0();
Cr0 &= ~(CR0_MP | CR0_EM | CR0_TS);
__writecr0(Cr0);
/* Save FPU state */
Ke386SaveFpuState(SaveArea);
/* Mark CR0 state dirty */
Cr0 |= NPX_STATE_NOT_LOADED;
Cr0 |= SaveArea->Cr0NpxState;
__writecr0(Cr0);
/* Update NPX state */
Thread->NpxState = NPX_STATE_NOT_LOADED;
KeGetCurrentPrcb()->NpxThread = NULL;
/* Clear the TS bit and re-enable interrupts */
SaveArea->Cr0NpxState &= ~CR0_TS;
_enable();
/* Now look at MxCsr to get the mask of errors we should care about */
MxCsrMask = ~((USHORT)SaveArea->U.FxArea.MXCsr >> 7);
/* Get legal exceptions that software should handle */
Error = (USHORT)SaveArea->U.FxArea.MXCsr & (FSW_INVALID_OPERATION |
FSW_DENORMAL |
FSW_ZERO_DIVIDE |
FSW_OVERFLOW |
FSW_UNDERFLOW |
FSW_PRECISION);
Error &= MxCsrMask;
/* Now handle any of those legal errors */
if (Error & (FSW_INVALID_OPERATION |
FSW_DENORMAL |
FSW_ZERO_DIVIDE |
FSW_OVERFLOW |
FSW_UNDERFLOW |
FSW_PRECISION))
{
/* By issuing an exception */
KiDispatchException1Args(STATUS_FLOAT_MULTIPLE_TRAPS,
TrapFrame->Eip,
0,
TrapFrame);
}
/* Unknown XMMI fault */
KeBugCheckWithTf(TRAP_CAUSE_UNKNOWN, 13, 0, 0, 1, TrapFrame);
}
/* SOFTWARE SERVICES **********************************************************/
VOID
FASTCALL
KiRaiseSecurityCheckFailureHandler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Decrement EIP to point to the INT29 instruction (2 bytes, not 1 like INT3) */
TrapFrame->Eip -= 2;
/* Check if this is a user trap */
if (KiUserTrap(TrapFrame))
{
/* Dispatch exception to user mode */
KiDispatchExceptionFromTrapFrame(STATUS_STACK_BUFFER_OVERRUN,
EXCEPTION_NONCONTINUABLE,
TrapFrame->Eip,
1,
TrapFrame->Ecx,
0,
0,
TrapFrame);
}
else
{
EXCEPTION_RECORD ExceptionRecord;
/* Bugcheck the system */
ExceptionRecord.ExceptionCode = STATUS_STACK_BUFFER_OVERRUN;
ExceptionRecord.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
ExceptionRecord.ExceptionRecord = NULL;
ExceptionRecord.ExceptionAddress = (PVOID)TrapFrame->Eip;
ExceptionRecord.NumberParameters = 1;
ExceptionRecord.ExceptionInformation[0] = TrapFrame->Ecx;
KeBugCheckWithTf(KERNEL_SECURITY_CHECK_FAILURE,
TrapFrame->Ecx,
(ULONG_PTR)TrapFrame,
(ULONG_PTR)&ExceptionRecord,
0,
TrapFrame);
}
}
VOID
FASTCALL
KiGetTickCountHandler(IN PKTRAP_FRAME TrapFrame)
{
UNIMPLEMENTED_DBGBREAK();
}
VOID
FASTCALL
KiCallbackReturnHandler(IN PKTRAP_FRAME TrapFrame)
{
PKTHREAD Thread;
NTSTATUS Status;
/* Save the SEH chain, NtCallbackReturn will restore this */
TrapFrame->ExceptionList = KeGetPcr()->NtTib.ExceptionList;
/* Set thread fields */
Thread = KeGetCurrentThread();
Thread->TrapFrame = TrapFrame;
Thread->PreviousMode = KiUserTrap(TrapFrame);
NT_ASSERT(Thread->PreviousMode != KernelMode);
/* Pass the register parameters to NtCallbackReturn.
Result pointer is in ecx, result length in edx, status in eax */
Status = NtCallbackReturn((PVOID)TrapFrame->Ecx,
TrapFrame->Edx,
TrapFrame->Eax);
/* If we got here, something went wrong. Return an error to the caller */
KiServiceExit(TrapFrame, Status);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiRaiseAssertionHandler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Decrement EIP to point to the INT2C instruction (2 bytes, not 1 like INT3) */
TrapFrame->Eip -= 2;
/* Dispatch the exception */
KiDispatchException0Args(STATUS_ASSERTION_FAILURE,
TrapFrame->Eip,
TrapFrame);
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiDebugServiceHandler(IN PKTRAP_FRAME TrapFrame)
{
/* Save trap frame */
KiEnterTrap(TrapFrame);
/* Increment EIP to skip the INT3 instruction */
TrapFrame->Eip++;
/* Continue with the common handler */
KiDebugHandler(TrapFrame, TrapFrame->Eax, TrapFrame->Ecx, TrapFrame->Edx);
}
FORCEINLINE
VOID
KiDbgPreServiceHook(ULONG SystemCallNumber, PULONG_PTR Arguments)
{
#if DBG && !defined(_WINKD_)
if (SystemCallNumber >= 0x1000 && KeWin32PreServiceHook)
KeWin32PreServiceHook(SystemCallNumber, Arguments);
#endif
}
FORCEINLINE
ULONG_PTR
KiDbgPostServiceHook(ULONG SystemCallNumber, ULONG_PTR Result)
{
#if DBG && !defined(_WINKD_)
if (SystemCallNumber >= 0x1000 && KeWin32PostServiceHook)
return KeWin32PostServiceHook(SystemCallNumber, Result);
#endif
return Result;
}
DECLSPEC_NORETURN
VOID
FASTCALL
KiSystemServiceHandler(IN PKTRAP_FRAME TrapFrame,
IN PVOID Arguments)
{
PKTHREAD Thread;
PKSERVICE_TABLE_DESCRIPTOR DescriptorTable;
ULONG Id, Offset, StackBytes, Result;
PVOID Handler;
ULONG SystemCallNumber = TrapFrame->Eax;
/* Get the current thread */
Thread = KeGetCurrentThread();
/* Set debug header */
KiFillTrapFrameDebug(TrapFrame);
/* Chain trap frames */
TrapFrame->Edx = (ULONG_PTR)Thread->TrapFrame;
/* No error code */
TrapFrame->ErrCode = 0;
/* Save previous mode */
TrapFrame->PreviousPreviousMode = Thread->PreviousMode;
/* Save the SEH chain and terminate it for now */
TrapFrame->ExceptionList = KeGetPcr()->NtTib.ExceptionList;
KeGetPcr()->NtTib.ExceptionList = EXCEPTION_CHAIN_END;
/* Default to debugging disabled */
TrapFrame->Dr7 = 0;
/* Check if the frame was from user mode */
if (KiUserTrap(TrapFrame))
{
/* Check for active debugging */
if (KeGetCurrentThread()->Header.DebugActive & 0xFF)
{
/* Handle debug registers */
KiHandleDebugRegistersOnTrapEntry(TrapFrame);
}
}
/* Set thread fields */
Thread->TrapFrame = TrapFrame;
Thread->PreviousMode = KiUserTrap(TrapFrame);
/* Enable interrupts */
_enable();
/* Decode the system call number */
Offset = (SystemCallNumber >> SERVICE_TABLE_SHIFT) & SERVICE_TABLE_MASK;
Id = SystemCallNumber & SERVICE_NUMBER_MASK;
/* Get descriptor table */
DescriptorTable = (PVOID)((ULONG_PTR)Thread->ServiceTable + Offset);
/* Validate the system call number */
if (__builtin_expect(Id >= DescriptorTable->Limit, 0))
{
/* Check if this is a GUI call */
if (!(Offset & SERVICE_TABLE_TEST))
{
/* Fail the call */
Result = STATUS_INVALID_SYSTEM_SERVICE;
goto ExitCall;
}
/* Convert us to a GUI thread -- must wrap in ASM to get new EBP */
Result = KiConvertToGuiThread();
/* Reload trap frame and descriptor table pointer from new stack */
TrapFrame = *(volatile PVOID*)&Thread->TrapFrame;
DescriptorTable = (PVOID)(*(volatile ULONG_PTR*)&Thread->ServiceTable + Offset);
if (!NT_SUCCESS(Result))
{
/* Set the last error and fail */
//SetLastWin32Error(RtlNtStatusToDosError(Result));
goto ExitCall;
}
/* Validate the system call number again */
if (Id >= DescriptorTable->Limit)
{
/* Fail the call */
Result = STATUS_INVALID_SYSTEM_SERVICE;
goto ExitCall;
}
}
/* Check if this is a GUI call */
if (__builtin_expect(Offset & SERVICE_TABLE_TEST, 0))
{
/* Get the batch count and flush if necessary */
if (NtCurrentTeb()->GdiBatchCount) KeGdiFlushUserBatch();
}
/* Increase system call count */
KeGetCurrentPrcb()->KeSystemCalls++;
/* FIXME: Increase individual counts on debug systems */
//KiIncreaseSystemCallCount(DescriptorTable, Id);
/* Get stack bytes */
StackBytes = DescriptorTable->Number[Id];
/* Probe caller stack */
if (__builtin_expect((Arguments < (PVOID)MmUserProbeAddress) && !(KiUserTrap(TrapFrame)), 0))
{
/* Access violation */
UNIMPLEMENTED_FATAL();
}
/* Call pre-service debug hook */
KiDbgPreServiceHook(SystemCallNumber, Arguments);
/* Get the handler and make the system call */
Handler = (PVOID)DescriptorTable->Base[Id];
Result = KiSystemCallTrampoline(Handler, Arguments, StackBytes);
/* Call post-service debug hook */
Result = KiDbgPostServiceHook(SystemCallNumber, Result);
/* Make sure we're exiting correctly */
KiExitSystemCallDebugChecks(Id, TrapFrame);
/* Restore the old trap frame */
ExitCall:
Thread->TrapFrame = (PKTRAP_FRAME)TrapFrame->Edx;
/* Exit from system call */
KiServiceExit(TrapFrame, Result);
}
/*
* @implemented
*/
VOID
NTAPI
Kei386EoiHelper(VOID)
{
/* We should never see this call happening */
ERROR_FATAL("Mismatched NT/HAL version");
}
/* EOF */
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