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Reactos
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254/* * PROJECT: ReactOS Kernel * LICENSE: BSD - See COPYING.ARM in the top level directory * FILE: ntoskrnl/ke/except.c * PURPOSE: Platform independent exception handling * PROGRAMMERS: ReactOS Portable Systems Group * Alex Ionescu (alex.ionescu@reactos.org) */
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>#define NDEBUG#include <debug.h>
/* FUNCTIONS *****************************************************************/
VOIDNTAPIKiContinuePreviousModeUser( _In_ PCONTEXT Context, _Out_ PKEXCEPTION_FRAME ExceptionFrame, _Out_ PKTRAP_FRAME TrapFrame){ CONTEXT LocalContext;
/* We'll have to make a copy and probe it */ ProbeForRead(Context, sizeof(CONTEXT), sizeof(ULONG)); RtlCopyMemory(&LocalContext, Context, sizeof(CONTEXT)); Context = &LocalContext;
/* Convert the context into Exception/Trap Frames */ KeContextToTrapFrame(&LocalContext, ExceptionFrame, TrapFrame, LocalContext.ContextFlags, UserMode);}
NTSTATUSNTAPIKiContinue(IN PCONTEXT Context, IN PKEXCEPTION_FRAME ExceptionFrame, IN PKTRAP_FRAME TrapFrame){ NTSTATUS Status = STATUS_SUCCESS; KIRQL OldIrql = APC_LEVEL; KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
/* Raise to APC_LEVEL, only if needed */ if (KeGetCurrentIrql() < APC_LEVEL) KeRaiseIrql(APC_LEVEL, &OldIrql);
/* Set up SEH to validate the context */ _SEH2_TRY { /* Check the previous mode */ if (PreviousMode != KernelMode) { /* Validate from user-mode */ KiContinuePreviousModeUser(Context, ExceptionFrame, TrapFrame); } else { /* Convert the context into Exception/Trap Frames */ KeContextToTrapFrame(Context, ExceptionFrame, TrapFrame, Context->ContextFlags, KernelMode); } } _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER) { /* Save the exception code */ Status = _SEH2_GetExceptionCode(); } _SEH2_END;
/* Lower the IRQL if needed */ if (OldIrql < APC_LEVEL) KeLowerIrql(OldIrql);
/* Return status */ return Status;}
NTSTATUSNTAPIKiRaiseException( _In_ PEXCEPTION_RECORD ExceptionRecord, _In_ PCONTEXT Context, _Out_ PKEXCEPTION_FRAME ExceptionFrame, _Out_ PKTRAP_FRAME TrapFrame, _In_ BOOLEAN SearchFrames){ KPROCESSOR_MODE PreviousMode = KeGetPreviousMode(); CONTEXT LocalContext; EXCEPTION_RECORD LocalExceptionRecord; ULONG ParameterCount, Size;
/* Check if we need to probe */ if (PreviousMode != KernelMode) { /* Set up SEH */ _SEH2_TRY { /* Probe the context */ ProbeForRead(Context, sizeof(CONTEXT), sizeof(ULONG));
/* Probe the Exception Record */ ProbeForRead(ExceptionRecord, FIELD_OFFSET(EXCEPTION_RECORD, NumberParameters) + sizeof(ULONG), sizeof(ULONG));
/* Validate the maximum parameters */ if ((ParameterCount = ExceptionRecord->NumberParameters) > EXCEPTION_MAXIMUM_PARAMETERS) { /* Too large */ _SEH2_YIELD(return STATUS_INVALID_PARAMETER); }
/* Probe the entire parameters now*/ Size = (sizeof(EXCEPTION_RECORD) - ((EXCEPTION_MAXIMUM_PARAMETERS - ParameterCount) * sizeof(ULONG))); ProbeForRead(ExceptionRecord, Size, sizeof(ULONG));
/* Now make copies in the stack */ RtlCopyMemory(&LocalContext, Context, sizeof(CONTEXT)); RtlCopyMemory(&LocalExceptionRecord, ExceptionRecord, Size); Context = &LocalContext; ExceptionRecord = &LocalExceptionRecord;
/* Update the parameter count */ ExceptionRecord->NumberParameters = ParameterCount; } _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER) { /* Don't fail silently */ DPRINT1("KiRaiseException: Failed to Probe\n");
/* Return the exception code */ _SEH2_YIELD(return _SEH2_GetExceptionCode()); } _SEH2_END; }
/* Convert the context record */ KeContextToTrapFrame(Context, ExceptionFrame, TrapFrame, Context->ContextFlags, PreviousMode);
/* Dispatch the exception */ ExceptionRecord->ExceptionCode &= ~KI_EXCEPTION_INTERNAL; KiDispatchException(ExceptionRecord, ExceptionFrame, TrapFrame, PreviousMode, SearchFrames);
/* We are done */ return STATUS_SUCCESS;}
/* SYSTEM CALLS ***************************************************************/
NTSTATUSNTAPINtRaiseException( _In_ PEXCEPTION_RECORD ExceptionRecord, _In_ PCONTEXT Context, _In_ BOOLEAN FirstChance){ NTSTATUS Status; PKTHREAD Thread; PKTRAP_FRAME TrapFrame;#ifdef _M_IX86 PKEXCEPTION_FRAME ExceptionFrame = NULL;#else KEXCEPTION_FRAME LocalExceptionFrame; PKEXCEPTION_FRAME ExceptionFrame = &LocalExceptionFrame;#endif
/* Get trap frame and link previous one */ Thread = KeGetCurrentThread(); TrapFrame = Thread->TrapFrame; Thread->TrapFrame = KiGetLinkedTrapFrame(TrapFrame);
/* Set exception list */#ifdef _M_IX86 KeGetPcr()->NtTib.ExceptionList = TrapFrame->ExceptionList;#endif
/* Raise the exception */ Status = KiRaiseException(ExceptionRecord, Context, ExceptionFrame, TrapFrame, FirstChance); if (!NT_SUCCESS(Status)) { DPRINT1("KiRaiseException failed. Status = 0x%lx\n", Status); return Status; }
/* It was handled, so exit restoring all state */ KiExceptionExit(TrapFrame, ExceptionFrame);}
NTSTATUSNTAPINtContinue( _In_ PCONTEXT Context, _In_ BOOLEAN TestAlert){ PKTHREAD Thread; NTSTATUS Status; PKTRAP_FRAME TrapFrame;#ifdef _M_IX86 PKEXCEPTION_FRAME ExceptionFrame = NULL;#else KEXCEPTION_FRAME LocalExceptionFrame; PKEXCEPTION_FRAME ExceptionFrame = &LocalExceptionFrame;#endif
/* Get trap frame and link previous one*/ Thread = KeGetCurrentThread(); TrapFrame = Thread->TrapFrame; Thread->TrapFrame = KiGetLinkedTrapFrame(TrapFrame);
/* Continue from this point on */ Status = KiContinue(Context, ExceptionFrame, TrapFrame); if (!NT_SUCCESS(Status)) { DPRINT1("KiContinue failed. Status = 0x%lx\n", Status); return Status; }
/* Check if alert was requested */ if (TestAlert) { KeTestAlertThread(Thread->PreviousMode); }
/* Exit to new context */ KiExceptionExit(TrapFrame, ExceptionFrame);}
/* EOF */