Sweden-Number/dlls/ntdll/exception.c

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/*
* NT exception handling routines
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*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include "ntstatus.h"
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#define WIN32_NO_STATUS
#include "windef.h"
#include "winternl.h"
#include "wine/exception.h"
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#include "wine/server.h"
#include "wine/list.h"
#include "wine/debug.h"
#include "excpt.h"
#include "ntdll_misc.h"
WINE_DEFAULT_DEBUG_CHANNEL(seh);
typedef struct
{
struct list entry;
PVECTORED_EXCEPTION_HANDLER func;
ULONG count;
} VECTORED_HANDLER;
static struct list vectored_exception_handlers = LIST_INIT(vectored_exception_handlers);
static struct list vectored_continue_handlers = LIST_INIT(vectored_continue_handlers);
static RTL_CRITICAL_SECTION vectored_handlers_section;
static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
{
0, 0, &vectored_handlers_section,
{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": vectored_handlers_section") }
};
static RTL_CRITICAL_SECTION vectored_handlers_section = { &critsect_debug, -1, 0, 0, 0, 0 };
static PRTL_EXCEPTION_FILTER unhandled_exception_filter;
static VECTORED_HANDLER *add_vectored_handler( struct list *handler_list, ULONG first,
PVECTORED_EXCEPTION_HANDLER func )
{
VECTORED_HANDLER *handler = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*handler) );
if (handler)
{
handler->func = RtlEncodePointer( func );
handler->count = 1;
RtlEnterCriticalSection( &vectored_handlers_section );
if (first) list_add_head( handler_list, &handler->entry );
else list_add_tail( handler_list, &handler->entry );
RtlLeaveCriticalSection( &vectored_handlers_section );
}
return handler;
}
static ULONG remove_vectored_handler( struct list *handler_list, VECTORED_HANDLER *handler )
{
struct list *ptr;
ULONG ret = FALSE;
RtlEnterCriticalSection( &vectored_handlers_section );
LIST_FOR_EACH( ptr, handler_list )
{
VECTORED_HANDLER *curr_handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
if (curr_handler == handler)
{
if (!--curr_handler->count) list_remove( ptr );
else handler = NULL; /* don't free it yet */
ret = TRUE;
break;
}
}
RtlLeaveCriticalSection( &vectored_handlers_section );
if (ret) RtlFreeHeap( GetProcessHeap(), 0, handler );
return ret;
}
/**********************************************************************
* wait_suspend
*
* Wait until the thread is no longer suspended.
*/
void wait_suspend( CONTEXT *context )
{
LARGE_INTEGER timeout;
int saved_errno = errno;
context_t server_context;
DWORD flags = context->ContextFlags;
context_to_server( &server_context, context );
/* store the context we got at suspend time */
SERVER_START_REQ( set_suspend_context )
{
wine_server_add_data( req, &server_context, sizeof(server_context) );
wine_server_call( req );
}
SERVER_END_REQ;
/* wait with 0 timeout, will only return once the thread is no longer suspended */
timeout.QuadPart = 0;
server_select( NULL, 0, SELECT_INTERRUPTIBLE, &timeout );
/* retrieve the new context */
SERVER_START_REQ( get_suspend_context )
{
wine_server_set_reply( req, &server_context, sizeof(server_context) );
wine_server_call( req );
if (wine_server_reply_size( reply ))
{
context_from_server( context, &server_context );
context->ContextFlags |= flags; /* unchanged registers are still available */
}
}
SERVER_END_REQ;
errno = saved_errno;
}
/**********************************************************************
* send_debug_event
*
* Send an EXCEPTION_DEBUG_EVENT event to the debugger.
*/
NTSTATUS send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
{
NTSTATUS ret;
DWORD i;
obj_handle_t handle = 0;
client_ptr_t params[EXCEPTION_MAXIMUM_PARAMETERS];
context_t server_context;
select_op_t select_op;
if (!NtCurrentTeb()->Peb->BeingDebugged) return 0; /* no debugger present */
for (i = 0; i < min( rec->NumberParameters, EXCEPTION_MAXIMUM_PARAMETERS ); i++)
params[i] = rec->ExceptionInformation[i];
context_to_server( &server_context, context );
SERVER_START_REQ( queue_exception_event )
{
req->first = first_chance;
req->code = rec->ExceptionCode;
req->flags = rec->ExceptionFlags;
req->record = wine_server_client_ptr( rec->ExceptionRecord );
req->address = wine_server_client_ptr( rec->ExceptionAddress );
req->len = i * sizeof(params[0]);
wine_server_add_data( req, params, req->len );
wine_server_add_data( req, &server_context, sizeof(server_context) );
if (!wine_server_call( req )) handle = reply->handle;
}
SERVER_END_REQ;
if (!handle) return 0;
select_op.wait.op = SELECT_WAIT;
select_op.wait.handles[0] = handle;
server_select( &select_op, offsetof( select_op_t, wait.handles[1] ), SELECT_INTERRUPTIBLE, NULL );
SERVER_START_REQ( get_exception_status )
{
req->handle = handle;
wine_server_set_reply( req, &server_context, sizeof(server_context) );
ret = wine_server_call( req );
}
SERVER_END_REQ;
if (ret >= 0) context_from_server( context, &server_context );
return ret;
}
/**********************************************************************
* call_vectored_handlers
*
* Call the vectored handlers chain.
*/
LONG call_vectored_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
{
struct list *ptr;
LONG ret = EXCEPTION_CONTINUE_SEARCH;
EXCEPTION_POINTERS except_ptrs;
PVECTORED_EXCEPTION_HANDLER func;
VECTORED_HANDLER *handler, *to_free = NULL;
except_ptrs.ExceptionRecord = rec;
except_ptrs.ContextRecord = context;
RtlEnterCriticalSection( &vectored_handlers_section );
ptr = list_head( &vectored_exception_handlers );
while (ptr)
{
handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
handler->count++;
func = RtlDecodePointer( handler->func );
RtlLeaveCriticalSection( &vectored_handlers_section );
RtlFreeHeap( GetProcessHeap(), 0, to_free );
to_free = NULL;
TRACE( "calling handler at %p code=%x flags=%x\n",
func, rec->ExceptionCode, rec->ExceptionFlags );
ret = func( &except_ptrs );
TRACE( "handler at %p returned %x\n", func, ret );
RtlEnterCriticalSection( &vectored_handlers_section );
ptr = list_next( &vectored_exception_handlers, ptr );
if (!--handler->count) /* removed during execution */
{
list_remove( &handler->entry );
to_free = handler;
}
if (ret == EXCEPTION_CONTINUE_EXECUTION) break;
}
RtlLeaveCriticalSection( &vectored_handlers_section );
RtlFreeHeap( GetProcessHeap(), 0, to_free );
return ret;
}
/*******************************************************************
* raise_status
*
* Implementation of RtlRaiseStatus with a specific exception record.
*/
void raise_status( NTSTATUS status, EXCEPTION_RECORD *rec )
{
EXCEPTION_RECORD ExceptionRec;
ExceptionRec.ExceptionCode = status;
ExceptionRec.ExceptionFlags = EH_NONCONTINUABLE;
ExceptionRec.ExceptionRecord = rec;
ExceptionRec.NumberParameters = 0;
for (;;) RtlRaiseException( &ExceptionRec ); /* never returns */
}
/***********************************************************************
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* RtlRaiseStatus (NTDLL.@)
*
* Raise an exception with ExceptionCode = status
*/
void WINAPI RtlRaiseStatus( NTSTATUS status )
{
raise_status( status, NULL );
}
/*******************************************************************
* RtlAddVectoredContinueHandler (NTDLL.@)
*/
PVOID WINAPI RtlAddVectoredContinueHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func )
{
return add_vectored_handler( &vectored_continue_handlers, first, func );
}
/*******************************************************************
* RtlRemoveVectoredContinueHandler (NTDLL.@)
*/
ULONG WINAPI RtlRemoveVectoredContinueHandler( PVOID handler )
{
return remove_vectored_handler( &vectored_continue_handlers, handler );
}
/*******************************************************************
* RtlAddVectoredExceptionHandler (NTDLL.@)
*/
PVOID WINAPI DECLSPEC_HOTPATCH RtlAddVectoredExceptionHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func )
{
return add_vectored_handler( &vectored_exception_handlers, first, func );
}
/*******************************************************************
* RtlRemoveVectoredExceptionHandler (NTDLL.@)
*/
ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler )
{
return remove_vectored_handler( &vectored_exception_handlers, handler );
}
/*******************************************************************
* RtlSetUnhandledExceptionFilter (NTDLL.@)
*/
void WINAPI RtlSetUnhandledExceptionFilter( PRTL_EXCEPTION_FILTER filter )
{
unhandled_exception_filter = filter;
}
/*******************************************************************
* call_unhandled_exception_filter
*/
LONG WINAPI call_unhandled_exception_filter( PEXCEPTION_POINTERS eptr )
{
if (!unhandled_exception_filter) return EXCEPTION_CONTINUE_SEARCH;
return unhandled_exception_filter( eptr );
}
/*************************************************************
* __wine_spec_unimplemented_stub
*
* ntdll-specific implementation to avoid depending on kernel functions.
* Can be removed once ntdll.spec no longer contains stubs.
*/
void __wine_spec_unimplemented_stub( const char *module, const char *function )
{
EXCEPTION_RECORD record;
record.ExceptionCode = EXCEPTION_WINE_STUB;
record.ExceptionFlags = EH_NONCONTINUABLE;
record.ExceptionRecord = NULL;
record.ExceptionAddress = __wine_spec_unimplemented_stub;
record.NumberParameters = 2;
record.ExceptionInformation[0] = (ULONG_PTR)module;
record.ExceptionInformation[1] = (ULONG_PTR)function;
for (;;) RtlRaiseException( &record );
}