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391 lines
11 KiB
391 lines
11 KiB
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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excptdbg.c
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Abstract:
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This module implements an exception dispatcher logging facility.
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Author:
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Kent Forschmiedt (kentf) 05-Oct-1995
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Revision History:
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Jonathan Schwartz (jschwart) 16-Jun-2000
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Added RtlUnhandledExceptionFilter
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Jay Krell (a-JayK) November 2000
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Added RtlUnhandledExceptionFilter2, takes __FUNCTION__ parameter
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--*/
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#include "ntrtlp.h"
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PLAST_EXCEPTION_LOG RtlpExceptionLog;
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ULONG RtlpExceptionLogCount;
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ULONG RtlpExceptionLogSize;
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VOID
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RtlInitializeExceptionLog(
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IN ULONG Entries
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)
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/*++
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Routine Description:
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This routine allocates space for the exception dispatcher logging
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facility, and records the address and size of the log area in globals
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where they can be found by the debugger.
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If memory is not available, the table pointer will remain NULL
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and the logging functions will do nothing.
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Arguments:
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Entries - Supplies the number of entries to allocate for
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Return Value:
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None
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--*/
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{
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#if defined(NTOS_KERNEL_RUNTIME)
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RtlpExceptionLog = (PLAST_EXCEPTION_LOG)ExAllocatePoolWithTag( NonPagedPool, sizeof(LAST_EXCEPTION_LOG) * Entries, 'gbdE' );
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#else
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//RtlpExceptionLog = (PLAST_EXCEPTION_LOG)RtlAllocateHeap( RtlProcessHeap(), 0, sizeof(LAST_EXCEPTION_LOG) * Entries );
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#endif
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if (RtlpExceptionLog) {
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RtlpExceptionLogSize = Entries;
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}
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}
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ULONG
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RtlpLogExceptionHandler(
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IN PEXCEPTION_RECORD ExceptionRecord,
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IN PCONTEXT ContextRecord,
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IN ULONG_PTR ControlPc,
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IN PVOID HandlerData,
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IN ULONG Size
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)
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/*++
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Routine Description:
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Records the dispatching of exceptions to frame-based handlers.
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The debugger may inspect the table later and interpret the data
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to discover the address of the filters and handlers.
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Arguments:
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ExceptionRecord - Supplies an exception record
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ContextRecord - Supplies the context at the exception
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ControlPc - Supplies the PC where control left the frame being
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dispatched to.
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HandlerData - Supplies a pointer to the host-dependent exception
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data. On the RISC machines this is a RUNTIME_FUNCTION record;
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on x86 it is the registration record from the stack frame.
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Size - Supplies the size of HandlerData
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Returns:
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The index to the log entry used, so that if the handler returns
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a disposition it may be recorded.
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--*/
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{
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#if !defined(NTOS_KERNEL_RUNTIME)
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return 0;
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#else
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ULONG LogIndex;
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if (!RtlpExceptionLog) {
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return 0;
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}
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ASSERT(Size <= MAX_EXCEPTION_LOG_DATA_SIZE * sizeof(ULONG));
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do {
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LogIndex = RtlpExceptionLogCount;
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} while (LogIndex != (ULONG)InterlockedCompareExchange(
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(PLONG)&RtlpExceptionLogCount,
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((LogIndex + 1) % MAX_EXCEPTION_LOG),
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LogIndex));
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//
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// the debugger will have to interpret the exception handler
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// data, because it cannot be done safely here.
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//
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RtlCopyMemory(RtlpExceptionLog[LogIndex].HandlerData,
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HandlerData,
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Size);
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RtlpExceptionLog[LogIndex].ExceptionRecord = *ExceptionRecord;
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RtlpExceptionLog[LogIndex].ContextRecord = *ContextRecord;
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RtlpExceptionLog[LogIndex].Disposition = -1;
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return LogIndex;
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#endif // !NTOS_KERNEL_RUNTIME
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}
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VOID
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RtlpLogLastExceptionDisposition(
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ULONG LogIndex,
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EXCEPTION_DISPOSITION Disposition
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)
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/*++
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Routine Description:
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Records the disposition from an exception handler.
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Arguments:
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LogIndex - Supplies the entry number of the exception log record.
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Disposition - Supplies the disposition code
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Return Value:
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None
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--*/
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{
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// If MAX_EXCEPTION_LOG or more exceptions were dispatched while
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// this one was being handled, this disposition will get written
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// on the wrong record. Oh well.
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if (RtlpExceptionLog) {
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RtlpExceptionLog[LogIndex].Disposition = Disposition;
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}
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}
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LONG
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NTAPI
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RtlUnhandledExceptionFilter(
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IN struct _EXCEPTION_POINTERS *ExceptionInfo
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)
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{
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return RtlUnhandledExceptionFilter2(ExceptionInfo, "");
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}
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LONG
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NTAPI
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RtlUnhandledExceptionFilter2(
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IN struct _EXCEPTION_POINTERS *ExceptionInfo,
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IN CONST CHAR* Function
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)
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/*++
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Routine Description:
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Default exception handler that prints info and does a DbgBreak if
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a debugger is attached to the machine.
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Arguments:
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ExceptionInfo - Structure containing the exception and context records
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Function - the function containing the __except, such as returned by __FUNCTION__
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Returns:
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EXCEPTION_CONTINUE_EXECUTION or EXCEPTION_CONTINUE_SEARCH
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--*/
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{
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LPCWSTR lpProcessName = NtCurrentPeb()->ProcessParameters->CommandLine.Buffer;
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BOOLEAN DebuggerPresent = NtCurrentPeb()->BeingDebugged;
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if (!DebuggerPresent)
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{
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SYSTEM_KERNEL_DEBUGGER_INFORMATION KdInfo = { 0 };
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NtQuerySystemInformation(
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SystemKernelDebuggerInformation,
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&KdInfo,
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sizeof(KdInfo),
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NULL);
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DebuggerPresent = KdInfo.KernelDebuggerEnabled;
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}
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if (DebuggerPresent)
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{
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switch ( ExceptionInfo->ExceptionRecord->ExceptionCode )
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{
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case STATUS_POSSIBLE_DEADLOCK:
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{
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PRTL_CRITICAL_SECTION CritSec;
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PRTL_CRITICAL_SECTION_DEBUG CritSecDebug;
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CritSec = (PRTL_CRITICAL_SECTION)
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ExceptionInfo->ExceptionRecord->ExceptionInformation[ 0 ];
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if ( CritSec )
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{
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try
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{
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CritSecDebug = CritSec->DebugInfo ;
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if ( CritSecDebug->Type == RTL_RESOURCE_TYPE )
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{
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PRTL_RESOURCE Resource = (PRTL_RESOURCE) CritSec;
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DbgPrint("\n\n *** Resource timeout (%p) in %ws:%s\n\n",
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Resource, lpProcessName, Function );
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if ( Resource->NumberOfActive < 0 )
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{
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DbgPrint("The resource is owned exclusively by thread %x\n",
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Resource->ExclusiveOwnerThread);
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}
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else if ( Resource->NumberOfActive > 0 )
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{
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DbgPrint("The resource is owned shared by %d threads\n",
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Resource->NumberOfActive);
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}
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else
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{
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DbgPrint("The resource is unowned. This usually implies a "
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"slow-moving machine due to memory pressure\n\n");
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}
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}
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else
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{
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DbgPrint("\n\n *** Critical Section Timeout (%p) in %ws:%s\n\n",
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CritSec, lpProcessName, Function );
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if (CritSec->OwningThread != 0)
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{
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DbgPrint("The critical section is owned by thread %x.\n",
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CritSec->OwningThread );
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DbgPrint("Go determine why that thread has not released "
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"the critical section.\n\n" );
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}
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else
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{
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DbgPrint("The critical section is unowned. This "
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"usually implies a slow-moving machine "
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"due to memory pressure\n\n");
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}
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}
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}
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except( EXCEPTION_EXECUTE_HANDLER )
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{
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NOTHING ;
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}
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}
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break;
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}
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case STATUS_IN_PAGE_ERROR:
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DbgPrint("\n\n *** Inpage error in %ws:%s\n\n", lpProcessName, Function );
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DbgPrint("The instruction at %p referenced memory at %p.\n",
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ExceptionInfo->ExceptionRecord->ExceptionAddress,
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ExceptionInfo->ExceptionRecord->ExceptionInformation[1]);
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DbgPrint("This failed because of error %x.\n\n",
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ExceptionInfo->ExceptionRecord->ExceptionInformation[2]);
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switch (ExceptionInfo->ExceptionRecord->ExceptionInformation[2])
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{
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case STATUS_INSUFFICIENT_RESOURCES:
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DbgPrint("This means the machine is out of memory. Use !vm "
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"to see where all the memory is being used.\n\n");
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break;
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case STATUS_DEVICE_DATA_ERROR:
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case STATUS_DISK_OPERATION_FAILED:
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DbgPrint("This means the data could not be read, typically because "
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"of a bad block on the disk. Check your hardware.\n\n");
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break;
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case STATUS_IO_DEVICE_ERROR:
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DbgPrint("This means that the I/O device reported an I/O error. "
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"Check your hardware.");
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break;
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}
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break;
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case STATUS_ACCESS_VIOLATION:
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DbgPrint("\n\n *** An Access Violation occurred in %ws:%s\n\n", lpProcessName, Function );
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DbgPrint("The instruction at %p tried to %s ",
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ExceptionInfo->ExceptionRecord->ExceptionAddress,
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ExceptionInfo->ExceptionRecord->ExceptionInformation[0] ?
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"write to" : "read from" );
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if ( ExceptionInfo->ExceptionRecord->ExceptionInformation[1] )
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{
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DbgPrint("an invalid address, %p\n\n",
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ExceptionInfo->ExceptionRecord->ExceptionInformation[1] );
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}
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else
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{
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DbgPrint("a NULL pointer\n\n" );
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}
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break;
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default:
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DbgPrint("\n\n *** Unhandled exception 0x%08lx, hit in %ws:%s\n\n", ExceptionInfo->ExceptionRecord->ExceptionCode, lpProcessName, Function);
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}
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DbgPrint(" *** enter .exr %p for the exception record\n",
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ExceptionInfo->ExceptionRecord);
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DbgPrint(" *** enter .cxr %p for the context\n",
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ExceptionInfo->ContextRecord);
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//
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// .cxr <foo> now changes the debugger state so kb
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// will do the trick (vs. !kb previously)
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//
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DbgPrint(" *** then kb to get the faulting stack\n\n");
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DbgBreakPoint();
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}
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if (ExceptionInfo->ExceptionRecord->ExceptionCode == STATUS_POSSIBLE_DEADLOCK)
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{
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if (DebuggerPresent)
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{
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DbgPrint(" *** Restarting wait on critsec or resource at %p (in %ws:%s)\n\n",
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ExceptionInfo->ExceptionRecord->ExceptionInformation[0],
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lpProcessName,
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Function);
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}
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return EXCEPTION_CONTINUE_EXECUTION;
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}
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return EXCEPTION_CONTINUE_SEARCH;
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}
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