| /* |
| * NT exception handling routines |
| * |
| * Copyright 1999 Turchanov Sergey |
| * Copyright 1999 Alexandre Julliard |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include "config.h" |
| #include "wine/port.h" |
| |
| #include <assert.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| |
| #include "ntstatus.h" |
| #include "windef.h" |
| #include "winbase.h" |
| #include "thread.h" |
| #include "winternl.h" |
| #include "wine/exception.h" |
| #include "wine/server.h" |
| #include "wine/list.h" |
| #include "wine/debug.h" |
| #include "excpt.h" |
| #include "ntdll_misc.h" |
| |
| WINE_DEFAULT_DEBUG_CHANNEL(seh); |
| |
| /* Exception record for handling exceptions happening inside exception handlers */ |
| typedef struct |
| { |
| EXCEPTION_REGISTRATION_RECORD frame; |
| EXCEPTION_REGISTRATION_RECORD *prevFrame; |
| } EXC_NESTED_FRAME; |
| |
| typedef struct |
| { |
| struct list entry; |
| PVECTORED_EXCEPTION_HANDLER func; |
| } VECTORED_HANDLER; |
| |
| static struct list vectored_handlers = LIST_INIT(vectored_handlers); |
| |
| static CRITICAL_SECTION vectored_handlers_section; |
| static CRITICAL_SECTION_DEBUG critsect_debug = |
| { |
| 0, 0, &vectored_handlers_section, |
| { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList }, |
| 0, 0, { 0, (DWORD)(__FILE__ ": vectored_handlers_section") } |
| }; |
| static CRITICAL_SECTION vectored_handlers_section = { &critsect_debug, -1, 0, 0, 0, 0 }; |
| |
| #ifdef __i386__ |
| # define GET_IP(context) ((LPVOID)(context)->Eip) |
| #elif defined(__sparc__) |
| # define GET_IP(context) ((LPVOID)(context)->pc) |
| #elif defined(__powerpc__) |
| # define GET_IP(context) ((LPVOID)(context)->Iar) |
| #else |
| # error You must define GET_IP for this CPU |
| #endif |
| |
| |
| /******************************************************************* |
| * EXC_RaiseHandler |
| * |
| * Handler for exceptions happening inside a handler. |
| */ |
| static DWORD EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame, |
| CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher ) |
| { |
| if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)) |
| return ExceptionContinueSearch; |
| /* We shouldn't get here so we store faulty frame in dispatcher */ |
| *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame; |
| return ExceptionNestedException; |
| } |
| |
| |
| /******************************************************************* |
| * EXC_UnwindHandler |
| * |
| * Handler for exceptions happening inside an unwind handler. |
| */ |
| static DWORD EXC_UnwindHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame, |
| CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher ) |
| { |
| if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))) |
| return ExceptionContinueSearch; |
| /* We shouldn't get here so we store faulty frame in dispatcher */ |
| *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame; |
| return ExceptionCollidedUnwind; |
| } |
| |
| |
| /******************************************************************* |
| * EXC_CallHandler |
| * |
| * Call an exception handler, setting up an exception frame to catch exceptions |
| * happening during the handler execution. |
| * Please do not change the first 4 parameters order in any way - some exceptions handlers |
| * rely on Base Pointer (EBP) to have a fixed position related to the exception frame |
| */ |
| static DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame, |
| CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher, |
| PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler) |
| { |
| EXC_NESTED_FRAME newframe; |
| DWORD ret; |
| |
| newframe.frame.Handler = nested_handler; |
| newframe.prevFrame = frame; |
| __wine_push_frame( &newframe.frame ); |
| TRACE( "calling handler at %p code=%lx flags=%lx\n", |
| handler, record->ExceptionCode, record->ExceptionFlags ); |
| ret = handler( record, frame, context, dispatcher ); |
| TRACE( "handler returned %lx\n", ret ); |
| __wine_pop_frame( &newframe.frame ); |
| return ret; |
| } |
| |
| |
| /********************************************************************** |
| * send_debug_event |
| * |
| * Send an EXCEPTION_DEBUG_EVENT event to the debugger. |
| */ |
| static int send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context ) |
| { |
| int ret; |
| HANDLE handle = 0; |
| |
| if (!NtCurrentTeb()->Peb->BeingDebugged) return 0; /* no debugger present */ |
| |
| SERVER_START_REQ( queue_exception_event ) |
| { |
| req->first = first_chance; |
| wine_server_add_data( req, context, sizeof(*context) ); |
| wine_server_add_data( req, rec, sizeof(*rec) ); |
| if (!wine_server_call( req )) handle = reply->handle; |
| } |
| SERVER_END_REQ; |
| if (!handle) return 0; |
| |
| /* No need to wait on the handle since the process gets suspended |
| * once the event is passed to the debugger, so when we get back |
| * here the event has been continued already. |
| */ |
| SERVER_START_REQ( get_exception_status ) |
| { |
| req->handle = handle; |
| wine_server_set_reply( req, context, sizeof(*context) ); |
| wine_server_call( req ); |
| ret = reply->status; |
| } |
| SERVER_END_REQ; |
| NtClose( handle ); |
| return ret; |
| } |
| |
| |
| /********************************************************************** |
| * call_vectored_handlers |
| * |
| * Call the vectored handlers chain. |
| */ |
| static LONG call_vectored_handlers( EXCEPTION_RECORD *rec, CONTEXT *context ) |
| { |
| struct list *ptr; |
| LONG ret = EXCEPTION_CONTINUE_SEARCH; |
| EXCEPTION_POINTERS except_ptrs; |
| |
| except_ptrs.ExceptionRecord = rec; |
| except_ptrs.ContextRecord = context; |
| |
| RtlEnterCriticalSection( &vectored_handlers_section ); |
| LIST_FOR_EACH( ptr, &vectored_handlers ) |
| { |
| VECTORED_HANDLER *handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry ); |
| ret = handler->func( &except_ptrs ); |
| if (ret == EXCEPTION_CONTINUE_EXECUTION) break; |
| } |
| RtlLeaveCriticalSection( &vectored_handlers_section ); |
| return ret; |
| } |
| |
| |
| /******************************************************************* |
| * EXC_DefaultHandling |
| * |
| * Default handling for exceptions. Called when we didn't find a suitable handler. |
| */ |
| static void EXC_DefaultHandling( EXCEPTION_RECORD *rec, CONTEXT *context ) |
| { |
| if (send_debug_event( rec, FALSE, context ) == DBG_CONTINUE) return; /* continue execution */ |
| |
| if (rec->ExceptionFlags & EH_STACK_INVALID) |
| ERR("Exception frame is not in stack limits => unable to dispatch exception.\n"); |
| else if (rec->ExceptionCode == EXCEPTION_NONCONTINUABLE_EXCEPTION) |
| ERR("Process attempted to continue execution after noncontinuable exception.\n"); |
| else |
| ERR("Unhandled exception code %lx flags %lx addr %p\n", |
| rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress ); |
| NtTerminateProcess( NtCurrentProcess(), 1 ); |
| } |
| |
| |
| /*********************************************************************** |
| * RtlRaiseException (NTDLL.@) |
| */ |
| void WINAPI EXC_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context ) |
| { |
| PEXCEPTION_REGISTRATION_RECORD frame, dispatch, nested_frame; |
| EXCEPTION_RECORD newrec; |
| DWORD res, c; |
| |
| TRACE( "code=%lx flags=%lx addr=%p\n", rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress ); |
| for (c=0; c<rec->NumberParameters; c++) TRACE(" info[%ld]=%08lx\n", c, rec->ExceptionInformation[c]); |
| if (rec->ExceptionCode == EXCEPTION_WINE_STUB) |
| FIXME( "call to unimplemented function %s.%s\n", |
| (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] ); |
| #ifdef __i386__ |
| else |
| { |
| TRACE(" eax=%08lx ebx=%08lx ecx=%08lx edx=%08lx esi=%08lx edi=%08lx\n", |
| context->Eax, context->Ebx, context->Ecx, |
| context->Edx, context->Esi, context->Edi ); |
| TRACE(" ebp=%08lx esp=%08lx cs=%04lx ds=%04lx es=%04lx fs=%04lx gs=%04lx flags=%08lx\n", |
| context->Ebp, context->Esp, context->SegCs, context->SegDs, |
| context->SegEs, context->SegFs, context->SegGs, context->EFlags ); |
| } |
| #endif |
| |
| if (send_debug_event( rec, TRUE, context ) == DBG_CONTINUE) return; /* continue execution */ |
| |
| if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION) return; |
| |
| frame = NtCurrentTeb()->Tib.ExceptionList; |
| nested_frame = NULL; |
| while (frame != (PEXCEPTION_REGISTRATION_RECORD)~0UL) |
| { |
| /* Check frame address */ |
| if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) || |
| ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) || |
| (int)frame & 3) |
| { |
| rec->ExceptionFlags |= EH_STACK_INVALID; |
| break; |
| } |
| |
| /* Call handler */ |
| res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, EXC_RaiseHandler ); |
| if (frame == nested_frame) |
| { |
| /* no longer nested */ |
| nested_frame = NULL; |
| rec->ExceptionFlags &= ~EH_NESTED_CALL; |
| } |
| |
| switch(res) |
| { |
| case ExceptionContinueExecution: |
| if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return; |
| newrec.ExceptionCode = STATUS_NONCONTINUABLE_EXCEPTION; |
| newrec.ExceptionFlags = EH_NONCONTINUABLE; |
| newrec.ExceptionRecord = rec; |
| newrec.NumberParameters = 0; |
| RtlRaiseException( &newrec ); /* never returns */ |
| break; |
| case ExceptionContinueSearch: |
| break; |
| case ExceptionNestedException: |
| if (nested_frame < dispatch) nested_frame = dispatch; |
| rec->ExceptionFlags |= EH_NESTED_CALL; |
| break; |
| default: |
| newrec.ExceptionCode = STATUS_INVALID_DISPOSITION; |
| newrec.ExceptionFlags = EH_NONCONTINUABLE; |
| newrec.ExceptionRecord = rec; |
| newrec.NumberParameters = 0; |
| RtlRaiseException( &newrec ); /* never returns */ |
| break; |
| } |
| frame = frame->Prev; |
| } |
| EXC_DefaultHandling( rec, context ); |
| } |
| |
| /**********************************************************************/ |
| |
| #ifdef DEFINE_REGS_ENTRYPOINT |
| DEFINE_REGS_ENTRYPOINT( RtlRaiseException, EXC_RtlRaiseException, 4, 4 ); |
| #else |
| void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec ) |
| { |
| CONTEXT context; |
| memset( &context, 0, sizeof(context) ); |
| EXC_RtlRaiseException( rec, &context ); |
| } |
| #endif |
| |
| |
| /******************************************************************* |
| * RtlUnwind (NTDLL.@) |
| */ |
| void WINAPI EXC_RtlUnwind( PEXCEPTION_REGISTRATION_RECORD pEndFrame, PVOID unusedEip, |
| PEXCEPTION_RECORD pRecord, PVOID returnEax, CONTEXT *context ) |
| { |
| EXCEPTION_RECORD record, newrec; |
| PEXCEPTION_REGISTRATION_RECORD frame, dispatch; |
| |
| #ifdef __i386__ |
| context->Eax = (DWORD)returnEax; |
| #endif |
| |
| /* build an exception record, if we do not have one */ |
| if (!pRecord) |
| { |
| record.ExceptionCode = STATUS_UNWIND; |
| record.ExceptionFlags = 0; |
| record.ExceptionRecord = NULL; |
| record.ExceptionAddress = GET_IP(context); |
| record.NumberParameters = 0; |
| pRecord = &record; |
| } |
| |
| pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND); |
| |
| TRACE( "code=%lx flags=%lx\n", pRecord->ExceptionCode, pRecord->ExceptionFlags ); |
| |
| /* get chain of exception frames */ |
| frame = NtCurrentTeb()->Tib.ExceptionList; |
| while ((frame != (PEXCEPTION_REGISTRATION_RECORD)~0UL) && (frame != pEndFrame)) |
| { |
| /* Check frame address */ |
| if (pEndFrame && (frame > pEndFrame)) |
| { |
| newrec.ExceptionCode = STATUS_INVALID_UNWIND_TARGET; |
| newrec.ExceptionFlags = EH_NONCONTINUABLE; |
| newrec.ExceptionRecord = pRecord; |
| newrec.NumberParameters = 0; |
| RtlRaiseException( &newrec ); /* never returns */ |
| } |
| if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) || |
| ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) || |
| (int)frame & 3) |
| { |
| newrec.ExceptionCode = STATUS_BAD_STACK; |
| newrec.ExceptionFlags = EH_NONCONTINUABLE; |
| newrec.ExceptionRecord = pRecord; |
| newrec.NumberParameters = 0; |
| RtlRaiseException( &newrec ); /* never returns */ |
| } |
| |
| /* Call handler */ |
| switch(EXC_CallHandler( pRecord, frame, context, &dispatch, |
| frame->Handler, EXC_UnwindHandler )) |
| { |
| case ExceptionContinueSearch: |
| break; |
| case ExceptionCollidedUnwind: |
| frame = dispatch; |
| break; |
| default: |
| newrec.ExceptionCode = STATUS_INVALID_DISPOSITION; |
| newrec.ExceptionFlags = EH_NONCONTINUABLE; |
| newrec.ExceptionRecord = pRecord; |
| newrec.NumberParameters = 0; |
| RtlRaiseException( &newrec ); /* never returns */ |
| break; |
| } |
| frame = __wine_pop_frame( frame ); |
| } |
| } |
| |
| /**********************************************************************/ |
| |
| #ifdef DEFINE_REGS_ENTRYPOINT |
| DEFINE_REGS_ENTRYPOINT( RtlUnwind, EXC_RtlUnwind, 16, 16 ); |
| #else |
| void WINAPI RtlUnwind( PVOID pEndFrame, PVOID unusedEip, |
| PEXCEPTION_RECORD pRecord, PVOID returnEax ) |
| { |
| CONTEXT context; |
| memset( &context, 0, sizeof(context) ); |
| EXC_RtlUnwind( pEndFrame, unusedEip, pRecord, returnEax, &context ); |
| } |
| #endif |
| |
| |
| /******************************************************************* |
| * NtRaiseException (NTDLL.@) |
| */ |
| void WINAPI EXC_NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx, |
| BOOL first, CONTEXT *context ) |
| { |
| EXC_RtlRaiseException( rec, ctx ); |
| *context = *ctx; |
| } |
| |
| #ifdef DEFINE_REGS_ENTRYPOINT |
| DEFINE_REGS_ENTRYPOINT( NtRaiseException, EXC_NtRaiseException, 12, 12 ); |
| #else |
| void WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx, BOOL first ) |
| { |
| CONTEXT context; |
| memset( &context, 0, sizeof(context) ); |
| EXC_NtRaiseException( rec, ctx, first, &context ); |
| } |
| #endif |
| |
| |
| /*********************************************************************** |
| * RtlRaiseStatus (NTDLL.@) |
| * |
| * Raise an exception with ExceptionCode = status |
| */ |
| void WINAPI RtlRaiseStatus( NTSTATUS status ) |
| { |
| EXCEPTION_RECORD ExceptionRec; |
| |
| ExceptionRec.ExceptionCode = status; |
| ExceptionRec.ExceptionFlags = EH_NONCONTINUABLE; |
| ExceptionRec.ExceptionRecord = NULL; |
| ExceptionRec.NumberParameters = 0; |
| RtlRaiseException( &ExceptionRec ); |
| } |
| |
| |
| /******************************************************************* |
| * RtlAddVectoredExceptionHandler (NTDLL.@) |
| */ |
| PVOID WINAPI RtlAddVectoredExceptionHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func ) |
| { |
| VECTORED_HANDLER *handler = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*handler) ); |
| if (handler) |
| { |
| handler->func = func; |
| RtlEnterCriticalSection( &vectored_handlers_section ); |
| if (first) list_add_head( &vectored_handlers, &handler->entry ); |
| else list_add_tail( &vectored_handlers, &handler->entry ); |
| RtlLeaveCriticalSection( &vectored_handlers_section ); |
| } |
| return handler; |
| } |
| |
| |
| /******************************************************************* |
| * RtlRemoveVectoredExceptionHandler (NTDLL.@) |
| */ |
| ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler ) |
| { |
| struct list *ptr; |
| ULONG ret = FALSE; |
| |
| RtlEnterCriticalSection( &vectored_handlers_section ); |
| LIST_FOR_EACH( ptr, &vectored_handlers ) |
| { |
| if (ptr == &((VECTORED_HANDLER *)handler)->entry) |
| { |
| list_remove( ptr ); |
| ret = TRUE; |
| break; |
| } |
| } |
| RtlLeaveCriticalSection( &vectored_handlers_section ); |
| if (ret) RtlFreeHeap( GetProcessHeap(), 0, handler ); |
| return ret; |
| } |
| |
| |
| /************************************************************* |
| * __wine_exception_handler (NTDLL.@) |
| * |
| * Exception handler for exception blocks declared in Wine code. |
| */ |
| DWORD __wine_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame, |
| CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher ) |
| { |
| __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame; |
| |
| if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL)) |
| return ExceptionContinueSearch; |
| if (wine_frame->u.filter) |
| { |
| EXCEPTION_POINTERS ptrs; |
| ptrs.ExceptionRecord = record; |
| ptrs.ContextRecord = context; |
| switch(wine_frame->u.filter( &ptrs )) |
| { |
| case EXCEPTION_CONTINUE_SEARCH: |
| return ExceptionContinueSearch; |
| case EXCEPTION_CONTINUE_EXECUTION: |
| return ExceptionContinueExecution; |
| case EXCEPTION_EXECUTE_HANDLER: |
| break; |
| default: |
| MESSAGE( "Invalid return value from exception filter\n" ); |
| assert( FALSE ); |
| } |
| } |
| /* hack to make GetExceptionCode() work in handler */ |
| wine_frame->ExceptionCode = record->ExceptionCode; |
| wine_frame->ExceptionRecord = wine_frame; |
| |
| RtlUnwind( frame, 0, record, 0 ); |
| __wine_pop_frame( frame ); |
| siglongjmp( wine_frame->jmp, 1 ); |
| } |
| |
| |
| /************************************************************* |
| * __wine_finally_handler (NTDLL.@) |
| * |
| * Exception handler for try/finally blocks declared in Wine code. |
| */ |
| DWORD __wine_finally_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame, |
| CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher ) |
| { |
| if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)) |
| { |
| __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame; |
| wine_frame->u.finally_func( FALSE ); |
| } |
| return ExceptionContinueSearch; |
| } |
