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/*
* 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., 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>
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.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);
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 )
{
int saved_errno = errno;
/* wait with 0 timeout, will only return once the thread is no longer suspended */
unix_funcs->server_select( NULL, 0, SELECT_INTERRUPTIBLE, 0, context, NULL, NULL );
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 exception_context = *context;
select_op_t select_op;
sigset_t old_set;
if (!NtCurrentTeb()->Peb->BeingDebugged) return 0; /* no debugger present */
pthread_sigmask( SIG_BLOCK, &server_block_set, &old_set );
for (i = 0; i < min( rec->NumberParameters, EXCEPTION_MAXIMUM_PARAMETERS ); i++)
params[i] = rec->ExceptionInformation[i];
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 );
if (!(ret = wine_server_call( req ))) handle = reply->handle;
}
SERVER_END_REQ;
if (handle)
{
select_op.wait.op = SELECT_WAIT;
select_op.wait.handles[0] = handle;
unix_funcs->server_select( &select_op, offsetof( select_op_t, wait.handles[1] ), SELECT_INTERRUPTIBLE, TIMEOUT_INFINITE, &exception_context, NULL, NULL );
SERVER_START_REQ( get_exception_status )
{
req->handle = handle;
ret = wine_server_call( req );
}
SERVER_END_REQ;
if (ret >= 0) *context = exception_context;
}
pthread_sigmask( SIG_SETMASK, &old_set, NULL );
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 */
}
/*******************************************************************
* NtRaiseException (NTDLL.@)
*/
NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
{
return unix_funcs->NtRaiseException( rec, context, first_chance );
}
/***********************************************************************
* 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 );
}
#if defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
struct dynamic_unwind_entry
{
struct list entry;
ULONG_PTR base;
ULONG_PTR end;
RUNTIME_FUNCTION *table;
DWORD count;
DWORD max_count;
PGET_RUNTIME_FUNCTION_CALLBACK callback;
PVOID context;
};
static struct list dynamic_unwind_list = LIST_INIT(dynamic_unwind_list);
static RTL_CRITICAL_SECTION dynamic_unwind_section;
static RTL_CRITICAL_SECTION_DEBUG dynamic_unwind_debug =
{
0, 0, &dynamic_unwind_section,
{ &dynamic_unwind_debug.ProcessLocksList, &dynamic_unwind_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": dynamic_unwind_section") }
};
static RTL_CRITICAL_SECTION dynamic_unwind_section = { &dynamic_unwind_debug, -1, 0, 0, 0, 0 };
static ULONG_PTR get_runtime_function_end( RUNTIME_FUNCTION *func, ULONG_PTR addr )
{
#ifdef __x86_64__
return func->EndAddress;
#elif defined(__arm__)
if (func->u.s.Flag) return func->BeginAddress + func->u.s.FunctionLength * 2;
else
{
struct unwind_info
{
DWORD function_length : 18;
DWORD version : 2;
DWORD x : 1;
DWORD e : 1;
DWORD f : 1;
DWORD count : 5;
DWORD words : 4;
} *info = (struct unwind_info *)(addr + func->u.UnwindData);
return func->BeginAddress + info->function_length * 2;
}
#else /* __aarch64__ */
if (func->u.s.Flag) return func->BeginAddress + func->u.s.FunctionLength * 4;
else
{
struct unwind_info
{
DWORD function_length : 18;
DWORD version : 2;
DWORD x : 1;
DWORD e : 1;
DWORD epilog : 5;
DWORD codes : 5;
} *info = (struct unwind_info *)(addr + func->u.UnwindData);
return func->BeginAddress + info->function_length * 4;
}
#endif
}
/**********************************************************************
* RtlAddFunctionTable (NTDLL.@)
*/
BOOLEAN CDECL RtlAddFunctionTable( RUNTIME_FUNCTION *table, DWORD count, ULONG_PTR addr )
{
struct dynamic_unwind_entry *entry;
TRACE( "%p %u %lx\n", table, count, addr );
/* NOTE: Windows doesn't check if table is aligned or a NULL pointer */
entry = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*entry) );
if (!entry)
return FALSE;
entry->base = addr;
entry->end = addr + (count ? get_runtime_function_end( &table[count - 1], addr ) : 0);
entry->table = table;
entry->count = count;
entry->max_count = 0;
entry->callback = NULL;
entry->context = NULL;
RtlEnterCriticalSection( &dynamic_unwind_section );
list_add_tail( &dynamic_unwind_list, &entry->entry );
RtlLeaveCriticalSection( &dynamic_unwind_section );
return TRUE;
}
/**********************************************************************
* RtlInstallFunctionTableCallback (NTDLL.@)
*/
BOOLEAN CDECL RtlInstallFunctionTableCallback( ULONG_PTR table, ULONG_PTR base, DWORD length,
PGET_RUNTIME_FUNCTION_CALLBACK callback, PVOID context,
PCWSTR dll )
{
struct dynamic_unwind_entry *entry;
TRACE( "%lx %lx %d %p %p %s\n", table, base, length, callback, context, wine_dbgstr_w(dll) );
/* NOTE: Windows doesn't check if the provided callback is a NULL pointer */
/* both low-order bits must be set */
if ((table & 0x3) != 0x3)
return FALSE;
entry = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*entry) );
if (!entry)
return FALSE;
entry->base = base;
entry->end = base + length;
entry->table = (RUNTIME_FUNCTION *)table;
entry->count = 0;
entry->max_count = 0;
entry->callback = callback;
entry->context = context;
RtlEnterCriticalSection( &dynamic_unwind_section );
list_add_tail( &dynamic_unwind_list, &entry->entry );
RtlLeaveCriticalSection( &dynamic_unwind_section );
return TRUE;
}
/*************************************************************************
* RtlAddGrowableFunctionTable (NTDLL.@)
*/
DWORD WINAPI RtlAddGrowableFunctionTable( void **table, RUNTIME_FUNCTION *functions, DWORD count,
DWORD max_count, ULONG_PTR base, ULONG_PTR end )
{
struct dynamic_unwind_entry *entry;
TRACE( "%p, %p, %u, %u, %lx, %lx\n", table, functions, count, max_count, base, end );
entry = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*entry) );
if (!entry)
return STATUS_NO_MEMORY;
entry->base = base;
entry->end = end;
entry->table = functions;
entry->count = count;
entry->max_count = max_count;
entry->callback = NULL;
entry->context = NULL;
RtlEnterCriticalSection( &dynamic_unwind_section );
list_add_tail( &dynamic_unwind_list, &entry->entry );
RtlLeaveCriticalSection( &dynamic_unwind_section );
*table = entry;
return STATUS_SUCCESS;
}
/*************************************************************************
* RtlGrowFunctionTable (NTDLL.@)
*/
void WINAPI RtlGrowFunctionTable( void *table, DWORD count )
{
struct dynamic_unwind_entry *entry;
TRACE( "%p, %u\n", table, count );
RtlEnterCriticalSection( &dynamic_unwind_section );
LIST_FOR_EACH_ENTRY( entry, &dynamic_unwind_list, struct dynamic_unwind_entry, entry )
{
if (entry == table)
{
if (count > entry->count && count <= entry->max_count)
entry->count = count;
break;
}
}
RtlLeaveCriticalSection( &dynamic_unwind_section );
}
/*************************************************************************
* RtlDeleteGrowableFunctionTable (NTDLL.@)
*/
void WINAPI RtlDeleteGrowableFunctionTable( void *table )
{
struct dynamic_unwind_entry *entry, *to_free = NULL;
TRACE( "%p\n", table );
RtlEnterCriticalSection( &dynamic_unwind_section );
LIST_FOR_EACH_ENTRY( entry, &dynamic_unwind_list, struct dynamic_unwind_entry, entry )
{
if (entry == table)
{
to_free = entry;
list_remove( &entry->entry );
break;
}
}
RtlLeaveCriticalSection( &dynamic_unwind_section );
RtlFreeHeap( GetProcessHeap(), 0, to_free );
}
/**********************************************************************
* RtlDeleteFunctionTable (NTDLL.@)
*/
BOOLEAN CDECL RtlDeleteFunctionTable( RUNTIME_FUNCTION *table )
{
struct dynamic_unwind_entry *entry, *to_free = NULL;
TRACE( "%p\n", table );
RtlEnterCriticalSection( &dynamic_unwind_section );
LIST_FOR_EACH_ENTRY( entry, &dynamic_unwind_list, struct dynamic_unwind_entry, entry )
{
if (entry->table == table)
{
to_free = entry;
list_remove( &entry->entry );
break;
}
}
RtlLeaveCriticalSection( &dynamic_unwind_section );
if (!to_free) return FALSE;
RtlFreeHeap( GetProcessHeap(), 0, to_free );
return TRUE;
}
/* helper for lookup_function_info() */
static RUNTIME_FUNCTION *find_function_info( ULONG_PTR pc, ULONG_PTR base,
RUNTIME_FUNCTION *func, ULONG size )
{
int min = 0;
int max = size - 1;
while (min <= max)
{
#ifdef __x86_64__
int pos = (min + max) / 2;
if (pc < base + func[pos].BeginAddress) max = pos - 1;
else if (pc >= base + func[pos].EndAddress) min = pos + 1;
else
{
func += pos;
while (func->UnwindData & 1) /* follow chained entry */
func = (RUNTIME_FUNCTION *)(base + (func->UnwindData & ~1));
return func;
}
#elif defined(__arm__)
int pos = (min + max) / 2;
if (pc < base + (func[pos].BeginAddress & ~1)) max = pos - 1;
else if (pc >= base + get_runtime_function_end( &func[pos], base )) min = pos + 1;
else return func + pos;
#else /* __aarch64__ */
int pos = (min + max) / 2;
if (pc < base + func[pos].BeginAddress) max = pos - 1;
else if (pc >= base + get_runtime_function_end( &func[pos], base )) min = pos + 1;
else return func + pos;
#endif
}
return NULL;
}
/**********************************************************************
* lookup_function_info
*/
RUNTIME_FUNCTION *lookup_function_info( ULONG_PTR pc, ULONG_PTR *base, LDR_DATA_TABLE_ENTRY **module )
{
RUNTIME_FUNCTION *func = NULL;
struct dynamic_unwind_entry *entry;
ULONG size;
/* PE module or wine module */
if (!LdrFindEntryForAddress( (void *)pc, module ))
{
*base = (ULONG_PTR)(*module)->DllBase;
if ((func = RtlImageDirectoryEntryToData( (*module)->DllBase, TRUE,
IMAGE_DIRECTORY_ENTRY_EXCEPTION, &size )))
{
/* lookup in function table */
func = find_function_info( pc, (ULONG_PTR)(*module)->DllBase, func, size/sizeof(*func) );
}
}
else
{
*module = NULL;
RtlEnterCriticalSection( &dynamic_unwind_section );
LIST_FOR_EACH_ENTRY( entry, &dynamic_unwind_list, struct dynamic_unwind_entry, entry )
{
if (pc >= entry->base && pc < entry->end)
{
*base = entry->base;
/* use callback or lookup in function table */
if (entry->callback)
func = entry->callback( pc, entry->context );
else
func = find_function_info( pc, entry->base, entry->table, entry->count );
break;
}
}
RtlLeaveCriticalSection( &dynamic_unwind_section );
}
return func;
}
/**********************************************************************
* RtlLookupFunctionEntry (NTDLL.@)
*/
PRUNTIME_FUNCTION WINAPI RtlLookupFunctionEntry( ULONG_PTR pc, ULONG_PTR *base,
UNWIND_HISTORY_TABLE *table )
{
LDR_DATA_TABLE_ENTRY *module;
RUNTIME_FUNCTION *func;
/* FIXME: should use the history table to make things faster */
if (!(func = lookup_function_info( pc, base, &module )))
{
*base = 0;
WARN( "no exception table found for %lx\n", pc );
}
return func;
}
#endif /* __x86_64__ || __arm__ || __aarch64__ */
/*************************************************************
* __wine_spec_unimplemented_stub
*
* ntdll-specific implementation to avoid depending on kernel functions.
* Can be removed once ntdll.spec no longer contains stubs.
*/
void __cdecl __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 );
}
/*************************************************************
* IsBadStringPtrA
*
* IsBadStringPtrA replacement for ntdll, to catch exception in debug traces.
*/
BOOL WINAPI IsBadStringPtrA( LPCSTR str, UINT_PTR max )
{
if (!str) return TRUE;
__TRY
{
volatile const char *p = str;
while (p != str + max) if (!*p++) break;
}
__EXCEPT_PAGE_FAULT
{
return TRUE;
}
__ENDTRY
return FALSE;
}
/*************************************************************
* IsBadStringPtrW
*
* IsBadStringPtrW replacement for ntdll, to catch exception in debug traces.
*/
BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT_PTR max )
{
if (!str) return TRUE;
__TRY
{
volatile const WCHAR *p = str;
while (p != str + max) if (!*p++) break;
}
__EXCEPT_PAGE_FAULT
{
return TRUE;
}
__ENDTRY
return FALSE;
}
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