/*++ Copyright (c) 1996 Microsoft Corporation Module Name: excprt.c Abstract: This module uses imagehlp.dll to dump the stack when an exception occurs. Author: Sunita Shrivastava(sunitas) 11/5/1997 Revision History: --*/ #include "initp.h" #include "dbghelp.h" // Make typedefs for some IMAGEHLP.DLL functions so that we can use them // with GetProcAddress typedef BOOL (__stdcall * SYMINITIALIZEPROC)( HANDLE, LPSTR, BOOL ); typedef BOOL (__stdcall *SYMCLEANUPPROC)( HANDLE ); typedef BOOL (__stdcall * STACKWALKPROC) ( DWORD, HANDLE, HANDLE, LPSTACKFRAME, LPVOID, PREAD_PROCESS_MEMORY_ROUTINE, PFUNCTION_TABLE_ACCESS_ROUTINE, PGET_MODULE_BASE_ROUTINE, PTRANSLATE_ADDRESS_ROUTINE ); typedef LPVOID (__stdcall *SYMFUNCTIONTABLEACCESSPROC)( HANDLE, ULONG_PTR ); typedef ULONG_PTR (__stdcall *SYMGETMODULEBASEPROC)( HANDLE, ULONG_PTR ); typedef BOOL (__stdcall *SYMGETSYMFROMADDRPROC) ( HANDLE, ULONG_PTR, PULONG_PTR, PIMAGEHLP_SYMBOL ); SYMINITIALIZEPROC _SymInitialize = 0; SYMCLEANUPPROC _SymCleanup = 0; STACKWALKPROC _StackWalk = 0; SYMFUNCTIONTABLEACCESSPROC _SymFunctionTableAccess = 0; SYMGETMODULEBASEPROC _SymGetModuleBase = 0; SYMGETSYMFROMADDRPROC _SymGetSymFromAddr = 0; //local prototypes for forward use BOOL InitImagehlpFunctions(); void ImagehlpStackWalk( IN PCONTEXT pContext ); BOOL GetLogicalAddress( IN PVOID addr, OUT LPWSTR szModule, IN DWORD len, OUT LPDWORD section, OUT PULONG_PTR offset ); void GenerateExceptionReport( IN PEXCEPTION_POINTERS pExceptionInfo) /*++ Routine Description: Top level exception handler for the cluster service process. Currently this just exits immediately and assumes that the cluster proxy will notice and restart us as appropriate. Arguments: ExceptionInfo - Supplies the exception information Return Value: None. --*/ { PCONTEXT pCtxt = pExceptionInfo->ContextRecord; if ( !InitImagehlpFunctions() ) { ClRtlLogPrint(LOG_CRITICAL, "[CS] Dbghelp.dll or its exported procs not found\r\n"); #if 0 #ifdef _M_IX86 // Intel Only! // Walk the stack using x86 specific code IntelStackWalk( pCtx ); #endif #endif return; } ImagehlpStackWalk( pCtxt ); _SymCleanup( GetCurrentProcess() ); } BOOL InitImagehlpFunctions() /*++ Routine Description: Initializes the imagehlp functions/data. Arguments: None. Return Value: None. --*/ { HMODULE hModImagehlp = LoadLibraryW( L"DBGHELP.DLL" ); if ( !hModImagehlp ) return FALSE; _SymInitialize = (SYMINITIALIZEPROC)GetProcAddress( hModImagehlp, "SymInitialize" ); if ( !_SymInitialize ) return FALSE; _SymCleanup = (SYMCLEANUPPROC)GetProcAddress( hModImagehlp, "SymCleanup" ); if ( !_SymCleanup ) return FALSE; _StackWalk = (STACKWALKPROC)GetProcAddress( hModImagehlp, "StackWalk" ); if ( !_StackWalk ) return FALSE; _SymFunctionTableAccess = (SYMFUNCTIONTABLEACCESSPROC) GetProcAddress( hModImagehlp, "SymFunctionTableAccess" ); if ( !_SymFunctionTableAccess ) return FALSE; _SymGetModuleBase=(SYMGETMODULEBASEPROC)GetProcAddress( hModImagehlp, "SymGetModuleBase"); if ( !_SymGetModuleBase ) return FALSE; _SymGetSymFromAddr=(SYMGETSYMFROMADDRPROC)GetProcAddress( hModImagehlp, "SymGetSymFromAddr" ); if ( !_SymGetSymFromAddr ) return FALSE; if ( !_SymInitialize( GetCurrentProcess(), 0, TRUE ) ) return FALSE; return TRUE; } void ImagehlpStackWalk( IN PCONTEXT pContext ) /*++ Routine Description: Walks the stack, and writes the results to the report file Arguments: ExceptionInfo - Supplies the exception information Return Value: None. --*/ { STACKFRAME sf; BYTE symbolBuffer[ sizeof(IMAGEHLP_SYMBOL) + 512 ]; PIMAGEHLP_SYMBOL pSymbol = (PIMAGEHLP_SYMBOL)symbolBuffer; ULONG_PTR symDisplacement = 0; // Displacement of the input address, // relative to the start of the symbol DWORD dwMachineType; UCHAR printBuffer[512]; DWORD nextPrtBufChar; #if defined (_M_IX86) dwMachineType = IMAGE_FILE_MACHINE_I386; #else if defined(_M_ALPHA) dwMachineType = IMAGE_FILE_MACHINE_ALPHA; #endif ClRtlLogPrint(LOG_CRITICAL, "[CS] CallStack:\r\n"); ClRtlLogPrint(LOG_CRITICAL, "[CS] Frame Address\r\n"); // Could use SymSetOptions here to add the SYMOPT_DEFERRED_LOADS flag memset( &sf, 0, sizeof(sf) ); #if defined (_M_IX86) // Initialize the STACKFRAME structure for the first call. This is only // necessary for Intel CPUs, and isn't mentioned in the documentation. sf.AddrPC.Offset = pContext->Eip; sf.AddrPC.Mode = AddrModeFlat; sf.AddrStack.Offset = pContext->Esp; sf.AddrStack.Mode = AddrModeFlat; sf.AddrFrame.Offset = pContext->Ebp; sf.AddrFrame.Mode = AddrModeFlat; #endif // _M_IX86 while ( 1 ) { if ( ! _StackWalk( dwMachineType, GetCurrentProcess(), GetCurrentThread(), &sf, pContext, 0, _SymFunctionTableAccess, _SymGetModuleBase, 0 ) ) break; if ( 0 == sf.AddrFrame.Offset ) // Basic sanity check to make sure break; // the frame is OK. Bail if not. nextPrtBufChar = sprintf(printBuffer, " %08X %08X ", sf.AddrFrame.Offset, sf.AddrPC.Offset ); // IMAGEHLP is wacky, and requires you to pass in a pointer to an // IMAGEHLP_SYMBOL structure. The problem is that this structure is // variable length. That is, you determine how big the structure is // at runtime. This means that you can't use sizeof(struct). // So...make a buffer that's big enough, and make a pointer // to the buffer. We also need to initialize not one, but TWO // members of the structure before it can be used. pSymbol->SizeOfStruct = sizeof(symbolBuffer); pSymbol->MaxNameLength = 512; if ( _SymGetSymFromAddr(GetCurrentProcess(), sf.AddrPC.Offset, &symDisplacement, pSymbol) ) { sprintf(printBuffer+nextPrtBufChar, "%hs+%p\n", pSymbol->Name, symDisplacement); } else // No symbol found. Print out the logical address instead. { WCHAR szModule[MAX_PATH] = L""; DWORD section = 0; ULONG_PTR offset = 0; GetLogicalAddress( (PVOID)sf.AddrPC.Offset, szModule, sizeof(szModule)/sizeof(WCHAR), §ion, &offset ); sprintf(printBuffer+nextPrtBufChar, "%04X:%08p %s\n", section, offset, szModule ); } ClRtlLogPrint(LOG_CRITICAL, "%1!hs!\n", printBuffer ); } } BOOL GetLogicalAddress( IN PVOID addr, OUT LPWSTR szModule, IN DWORD len, OUT LPDWORD section, OUT PULONG_PTR offset ) /*++ Routine Description: Given a linear address, locates the module, section, and offset containing that address. Note: the szModule paramater buffer is an output buffer of length specified by the len parameter (in characters!) Arguments: ExceptionInfo - Supplies the exception information Return Value: None. --*/ { MEMORY_BASIC_INFORMATION mbi; ULONG_PTR hMod; // Point to the DOS header in memory PIMAGE_DOS_HEADER pDosHdr; // From the DOS header, find the NT (PE) header PIMAGE_NT_HEADERS pNtHdr; PIMAGE_SECTION_HEADER pSection; ULONG_PTR rva ; int i; if ( !VirtualQuery( addr, &mbi, sizeof(mbi) ) ) return FALSE; hMod = (ULONG_PTR)mbi.AllocationBase; if ( !GetModuleFileName( (HMODULE)hMod, szModule, len ) ) return FALSE; rva = (ULONG_PTR)addr - hMod; // RVA is offset from module load address pDosHdr = (PIMAGE_DOS_HEADER)hMod; pNtHdr = (PIMAGE_NT_HEADERS)(hMod + pDosHdr->e_lfanew); pSection = IMAGE_FIRST_SECTION( pNtHdr ); // Iterate through the section table, looking for the one that encompasses // the linear address. for ( i = 0; i < pNtHdr->FileHeader.NumberOfSections; i++, pSection++ ) { ULONG_PTR sectionStart = pSection->VirtualAddress; ULONG_PTR sectionEnd = sectionStart + max(pSection->SizeOfRawData, pSection->Misc.VirtualSize); // Is the address in this section??? if ( (rva >= sectionStart) && (rva <= sectionEnd) ) { // Yes, address is in the section. Calculate section and offset, // and store in the "section" & "offset" params, which were // passed by reference. *section = i+1; *offset = rva - sectionStart; return TRUE; } } return FALSE; // Should never get here! }