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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 <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 "ddk/wdm.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;
}
/**********************************************************************
* 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 */
}
/***********************************************************************
* RtlRaiseStatus (NTDLL.@)
*
* Raise an exception with ExceptionCode = status
*/
void WINAPI RtlRaiseStatus( NTSTATUS status )
{
raise_status( status, NULL );
}
/*******************************************************************
* KiRaiseUserExceptionDispatcher (NTDLL.@)
*/
NTSTATUS WINAPI KiRaiseUserExceptionDispatcher(void)
{
DWORD code = NtCurrentTeb()->ExceptionCode;
EXCEPTION_RECORD rec = { code };
RtlRaiseException( &rec );
return code;
}
/*******************************************************************
* 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__ */
/*************************************************************
* _assert
*/
void __cdecl _assert( const char *str, const char *file, unsigned int line )
{
ERR( "%s:%u: Assertion failed %s\n", file, line, debugstr_a(str) );
RtlRaiseStatus( EXCEPTION_WINE_ASSERTION );
}
/*************************************************************
* __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;
}
__ASM_STDCALL_IMPORT(IsBadStringPtrA,8)
/*************************************************************
* 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;
}
__ASM_STDCALL_IMPORT(IsBadStringPtrW,8)
/**********************************************************************
* RtlGetEnabledExtendedFeatures (NTDLL.@)
*/
ULONG64 WINAPI RtlGetEnabledExtendedFeatures(ULONG64 feature_mask)
{
return user_shared_data->XState.EnabledFeatures & feature_mask;
}
struct context_copy_range
{
ULONG start;
ULONG flag;
};
static const struct context_copy_range copy_ranges_amd64[] =
{
{0x38, 0x1}, {0x3a, 0x4}, { 0x42, 0x1}, { 0x48, 0x10}, { 0x78, 0x2}, { 0x98, 0x1},
{0xa0, 0x2}, {0xf8, 0x1}, {0x100, 0x8}, {0x2a0, 0}, {0x4b0, 0x10}, {0x4d0, 0}
};
static const struct context_copy_range copy_ranges_x86[] =
{
{ 0x4, 0x10}, {0x1c, 0x8}, {0x8c, 0x4}, {0x9c, 0x2}, {0xb4, 0x1}, {0xcc, 0x20}, {0x1ec, 0},
{0x2cc, 0},
};
static const struct context_parameters
{
ULONG arch_flag;
ULONG supported_flags;
ULONG context_size; /* sizeof(CONTEXT) */
ULONG legacy_size; /* Legacy context size */
ULONG context_ex_size; /* sizeof(CONTEXT_EX) */
ULONG alignment; /* Used when computing size of context. */
ULONG true_alignment; /* Used for actual alignment. */
ULONG flags_offset;
const struct context_copy_range *copy_ranges;
}
arch_context_parameters[] =
{
{0x00100000, 0xd810005f, 0x4d0, 0x4d0, 0x20, 7, 0xf, 0x30, copy_ranges_amd64},
{0x00010000, 0xd801007f, 0x2cc, 0xcc, 0x18, 3, 0x3, 0, copy_ranges_x86},
};
static const struct context_parameters *context_get_parameters( ULONG context_flags )
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(arch_context_parameters); ++i)
{
if (context_flags & arch_context_parameters[i].arch_flag)
return context_flags & ~arch_context_parameters[i].supported_flags ? NULL : &arch_context_parameters[i];
}
return NULL;
}
/**********************************************************************
* RtlGetExtendedContextLength2 (NTDLL.@)
*/
NTSTATUS WINAPI RtlGetExtendedContextLength2( ULONG context_flags, ULONG *length, ULONG64 compaction_mask )
{
const struct context_parameters *p;
ULONG64 supported_mask;
ULONG64 size;
TRACE( "context_flags %#x, length %p, compaction_mask %s.\n", context_flags, length,
wine_dbgstr_longlong(compaction_mask) );
if (!(p = context_get_parameters( context_flags )))
return STATUS_INVALID_PARAMETER;
if (!(context_flags & 0x40))
{
*length = p->context_size + p->context_ex_size + p->alignment;
return STATUS_SUCCESS;
}
if (!(supported_mask = RtlGetEnabledExtendedFeatures( ~(ULONG64)0) ))
return STATUS_NOT_SUPPORTED;
compaction_mask &= supported_mask;
size = p->context_size + p->context_ex_size + offsetof(XSTATE, YmmContext) + 63;
if (compaction_mask & supported_mask & (1 << XSTATE_AVX))
size += sizeof(YMMCONTEXT);
*length = size;
return STATUS_SUCCESS;
}
/**********************************************************************
* RtlGetExtendedContextLength (NTDLL.@)
*/
NTSTATUS WINAPI RtlGetExtendedContextLength( ULONG context_flags, ULONG *length )
{
return RtlGetExtendedContextLength2( context_flags, length, ~(ULONG64)0 );
}
/**********************************************************************
* RtlInitializeExtendedContext2 (NTDLL.@)
*/
NTSTATUS WINAPI RtlInitializeExtendedContext2( void *context, ULONG context_flags, CONTEXT_EX **context_ex,
ULONG64 compaction_mask )
{
const struct context_parameters *p;
ULONG64 supported_mask = 0;
CONTEXT_EX *c_ex;
TRACE( "context %p, context_flags %#x, context_ex %p, compaction_mask %s.\n",
context, context_flags, context_ex, wine_dbgstr_longlong(compaction_mask));
if (!(p = context_get_parameters( context_flags )))
return STATUS_INVALID_PARAMETER;
if ((context_flags & 0x40) && !(supported_mask = RtlGetEnabledExtendedFeatures( ~(ULONG64)0 )))
return STATUS_NOT_SUPPORTED;
context = (void *)(((ULONG_PTR)context + p->true_alignment) & ~p->true_alignment);
*(ULONG *)((BYTE *)context + p->flags_offset) = context_flags;
*context_ex = c_ex = (CONTEXT_EX *)((BYTE *)context + p->context_size);
c_ex->Legacy.Offset = c_ex->All.Offset = -(LONG)p->context_size;
c_ex->Legacy.Length = context_flags & 0x20 ? p->context_size : p->legacy_size;
if (context_flags & 0x40)
{
XSTATE *xs;
compaction_mask &= supported_mask;
xs = (XSTATE *)(((ULONG_PTR)c_ex + p->context_ex_size + 63) & ~(ULONG_PTR)63);
c_ex->XState.Offset = (ULONG_PTR)xs - (ULONG_PTR)c_ex;
c_ex->XState.Length = offsetof(XSTATE, YmmContext);
compaction_mask &= supported_mask;
if (compaction_mask & (1 << XSTATE_AVX))
c_ex->XState.Length += sizeof(YMMCONTEXT);
memset( xs, 0, c_ex->XState.Length );
if (user_shared_data->XState.CompactionEnabled)
xs->CompactionMask = ((ULONG64)1 << 63) | compaction_mask;
c_ex->All.Length = p->context_size + c_ex->XState.Offset + c_ex->XState.Length;
}
else
{
c_ex->XState.Offset = 25; /* According to the tests, it is just 25 if CONTEXT_XSTATE is not specified. */
c_ex->XState.Length = 0;
c_ex->All.Length = p->context_size + 24; /* sizeof(CONTEXT_EX) minus 8 alignment bytes on x64. */
}
return STATUS_SUCCESS;
}
/**********************************************************************
* RtlInitializeExtendedContext (NTDLL.@)
*/
NTSTATUS WINAPI RtlInitializeExtendedContext( void *context, ULONG context_flags, CONTEXT_EX **context_ex )
{
return RtlInitializeExtendedContext2( context, context_flags, context_ex, ~(ULONG64)0 );
}
/**********************************************************************
* RtlLocateExtendedFeature2 (NTDLL.@)
*/
void * WINAPI RtlLocateExtendedFeature2( CONTEXT_EX *context_ex, ULONG feature_id,
XSTATE_CONFIGURATION *xstate_config, ULONG *length )
{
TRACE( "context_ex %p, feature_id %u, xstate_config %p, length %p.\n",
context_ex, feature_id, xstate_config, length );
if (!xstate_config)
{
FIXME( "NULL xstate_config.\n" );
return NULL;
}
if (xstate_config != &user_shared_data->XState)
{
FIXME( "Custom xstate configuration is not supported.\n" );
return NULL;
}
if (feature_id != XSTATE_AVX)
return NULL;
if (length)
*length = sizeof(YMMCONTEXT);
if (context_ex->XState.Length < sizeof(XSTATE))
return NULL;
return (BYTE *)context_ex + context_ex->XState.Offset + offsetof(XSTATE, YmmContext);
}
/**********************************************************************
* RtlLocateExtendedFeature (NTDLL.@)
*/
void * WINAPI RtlLocateExtendedFeature( CONTEXT_EX *context_ex, ULONG feature_id,
ULONG *length )
{
return RtlLocateExtendedFeature2( context_ex, feature_id, &user_shared_data->XState, length );
}
/**********************************************************************
* RtlLocateLegacyContext (NTDLL.@)
*/
void * WINAPI RtlLocateLegacyContext( CONTEXT_EX *context_ex, ULONG *length )
{
if (length)
*length = context_ex->Legacy.Length;
return (BYTE *)context_ex + context_ex->Legacy.Offset;
}
/**********************************************************************
* RtlSetExtendedFeaturesMask (NTDLL.@)
*/
void WINAPI RtlSetExtendedFeaturesMask( CONTEXT_EX *context_ex, ULONG64 feature_mask )
{
XSTATE *xs = (XSTATE *)((BYTE *)context_ex + context_ex->XState.Offset);
xs->Mask = RtlGetEnabledExtendedFeatures( feature_mask ) & ~(ULONG64)3;
}
/**********************************************************************
* RtlGetExtendedFeaturesMask (NTDLL.@)
*/
ULONG64 WINAPI RtlGetExtendedFeaturesMask( CONTEXT_EX *context_ex )
{
XSTATE *xs = (XSTATE *)((BYTE *)context_ex + context_ex->XState.Offset);
return xs->Mask & ~(ULONG64)3;
}
/**********************************************************************
* RtlCopyExtendedContext (NTDLL.@)
*/
NTSTATUS WINAPI RtlCopyExtendedContext( CONTEXT_EX *dst, ULONG context_flags, CONTEXT_EX *src )
{
const struct context_copy_range *range;
const struct context_parameters *p;
XSTATE *dst_xs, *src_xs;
ULONG64 feature_mask;
unsigned int start;
BYTE *d, *s;
TRACE( "dst %p, context_flags %#x, src %p.\n", dst, context_flags, src );
if (!(p = context_get_parameters( context_flags )))
return STATUS_INVALID_PARAMETER;
if (!(feature_mask = RtlGetEnabledExtendedFeatures( ~(ULONG64)0 )) && context_flags & 0x40)
return STATUS_NOT_SUPPORTED;
d = RtlLocateLegacyContext( dst, NULL );
s = RtlLocateLegacyContext( src, NULL );
*((ULONG *)(d + p->flags_offset)) |= context_flags;
start = 0;
range = p->copy_ranges;
do
{
if (range->flag & context_flags)
{
if (!start)
start = range->start;
}
else if (start)
{
memcpy( d + start, s + start, range->start - start );
start = 0;
}
}
while (range++->start != p->context_size);
if (!(context_flags & 0x40))
return STATUS_SUCCESS;
if (dst->XState.Length < offsetof(XSTATE, YmmContext))
return STATUS_BUFFER_OVERFLOW;
dst_xs = (XSTATE *)((BYTE *)dst + dst->XState.Offset);
src_xs = (XSTATE *)((BYTE *)src + src->XState.Offset);
memset(dst_xs, 0, offsetof(XSTATE, YmmContext));
dst_xs->Mask = (src_xs->Mask & ~(ULONG64)3) & feature_mask;
dst_xs->CompactionMask = user_shared_data->XState.CompactionEnabled
? ((ULONG64)1 << 63) | (src_xs->CompactionMask & feature_mask) : 0;
if (dst_xs->Mask & 4 && src->XState.Length >= sizeof(XSTATE) && dst->XState.Length >= sizeof(XSTATE))
memcpy( &dst_xs->YmmContext, &src_xs->YmmContext, sizeof(dst_xs->YmmContext) );
return STATUS_SUCCESS;
}
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