/*************************************************************
* call16_handler
*
* Handler for exceptions occurring in 16-bit code.
*/
static DWORD call16_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
{
/* unwinding: restore the stack pointer in the TEB, and leave the Win16 mutex */
STACK32FRAME *frame32 = (STACK32FRAME *)((char *)frame - offsetof(STACK32FRAME,frame));
NtCurrentTeb()->WOW32Reserved = (void *)frame32->frame16;
_LeaveWin16Lock();
}
else if (record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
record->ExceptionCode == EXCEPTION_PRIV_INSTRUCTION)
{
if (wine_ldt_is_system(context->SegCs))
{
if (fix_selector( context )) return ExceptionContinueExecution;
}
else
{
SEGPTR gpHandler;
DWORD ret = INSTR_EmulateInstruction( record, context );
/*
* Insert check for pending DPMI events. Note that this
* check must be inserted after instructions have been
* emulated because the instruction emulation requires
* original CS:IP and the emulation may change TEB.dpmi_vif.
*/
if(NtCurrentTeb()->dpmi_vif)
insert_event_check( context );
if (ret != ExceptionContinueSearch) return ret;
/* check for Win16 __GP handler */
if ((gpHandler = HasGPHandler16( MAKESEGPTR( context->SegCs, context->Eip ) )))
{
WORD *stack = wine_ldt_get_ptr( context->SegSs, context->Esp );
*--stack = context->SegCs;
*--stack = context->Eip;
if (!IS_SELECTOR_32BIT(context->SegSs))
context->Esp = MAKELONG( LOWORD(context->Esp - 2*sizeof(WORD)),
HIWORD(context->Esp) );
else
context->Esp -= 2*sizeof(WORD);
context->SegCs = SELECTOROF( gpHandler );
context->Eip = OFFSETOF( gpHandler );
return ExceptionContinueExecution;
}
}
}
else if (record->ExceptionCode == EXCEPTION_VM86_STI)
{
insert_event_check( context );
}
return ExceptionContinueSearch;
}
/***********************************************************************
* TASK_ExitTask
*/
void TASK_ExitTask(void)
{
WIN16_SUBSYSTEM_TIB *tib;
TDB *pTask;
DWORD lockCount;
/* Enter the Win16Lock to protect global data structures */
_EnterWin16Lock();
pTask = TASK_GetCurrent();
if ( !pTask )
{
_LeaveWin16Lock();
return;
}
TRACE("Killing task %04x\n", pTask->hSelf );
/* Perform USER cleanup */
TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
/* Remove the task from the list to be sure we never switch back to it */
TASK_UnlinkTask( pTask->hSelf );
if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
{
TRACE("this is the last task, exiting\n" );
ExitKernel16();
}
pTask->nEvents = 0;
if ( hLockedTask == pTask->hSelf )
hLockedTask = 0;
TASK_DeleteTask( pTask->hSelf );
if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
{
free_win16_tib( tib );
NtCurrentTeb()->Tib.SubSystemTib = NULL;
}
/* ... and completely release the Win16Lock, just in case. */
ReleaseThunkLock( &lockCount );
}
/* startup routine for a new 16-bit thread */
static DWORD CALLBACK task_start( LPVOID p )
{
struct create_data *data = p;
TDB *pTask = data->task;
DWORD ret;
kernel_get_thread_data()->htask16 = pTask->hSelf;
NtCurrentTeb()->Tib.SubSystemTib = data->tib;
HeapFree( GetProcessHeap(), 0, data );
_EnterWin16Lock();
TASK_LinkTask( pTask->hSelf );
pTask->teb = NtCurrentTeb();
ret = NE_StartTask();
_LeaveWin16Lock();
return ret;
}
/**********************************************************************
* K32WOWCallback16Ex (KERNEL32.55)
*/
BOOL WINAPI K32WOWCallback16Ex( DWORD vpfn16, DWORD dwFlags,
DWORD cbArgs, LPVOID pArgs, LPDWORD pdwRetCode )
{
#ifdef __i386__
/*
* Arguments must be prepared in the correct order by the caller
* (both for PASCAL and CDECL calling convention), so we simply
* copy them to the 16-bit stack ...
*/
char *stack = (char *)CURRENT_STACK16 - cbArgs;
memcpy( stack, pArgs, cbArgs );
if (dwFlags & (WCB16_REGS|WCB16_REGS_LONG))
{
CONTEXT *context = (CONTEXT *)pdwRetCode;
if (TRACE_ON(relay))
{
DWORD count = cbArgs / sizeof(WORD);
WORD * wstack = (WORD *)stack;
DPRINTF("%04lx:CallTo16(func=%04lx:%04x,ds=%04lx",
GetCurrentThreadId(),
context->SegCs, LOWORD(context->Eip), context->SegDs );
while (count) DPRINTF( ",%04x", wstack[--count] );
DPRINTF(") ss:sp=%04x:%04x",
SELECTOROF(NtCurrentTeb()->WOW32Reserved), OFFSETOF(NtCurrentTeb()->WOW32Reserved) );
DPRINTF(" ax=%04x bx=%04x cx=%04x dx=%04x si=%04x di=%04x bp=%04x es=%04x fs=%04x\n",
(WORD)context->Eax, (WORD)context->Ebx, (WORD)context->Ecx,
(WORD)context->Edx, (WORD)context->Esi, (WORD)context->Edi,
(WORD)context->Ebp, (WORD)context->SegEs, (WORD)context->SegFs );
SYSLEVEL_CheckNotLevel( 2 );
}
if (context->EFlags & 0x00020000) /* v86 mode */
{
EXCEPTION_REGISTRATION_RECORD frame;
frame.Handler = vm86_handler;
__wine_push_frame( &frame );
__wine_enter_vm86( context );
__wine_pop_frame( &frame );
}
else
{
/* push return address */
if (dwFlags & WCB16_REGS_LONG)
{
stack -= sizeof(DWORD);
*((DWORD *)stack) = HIWORD(call16_ret_addr);
stack -= sizeof(DWORD);
*((DWORD *)stack) = LOWORD(call16_ret_addr);
cbArgs += 2 * sizeof(DWORD);
}
else
{
stack -= sizeof(SEGPTR);
*((SEGPTR *)stack) = call16_ret_addr;
cbArgs += sizeof(SEGPTR);
}
/*
* Start call by checking for pending events.
* Note that wine_call_to_16_regs overwrites context stack
* pointer so we may modify it here without a problem.
*/
if (NtCurrentTeb()->dpmi_vif)
{
context->SegSs = wine_get_ds();
context->Esp = (DWORD)stack;
insert_event_check( context );
cbArgs += (DWORD)stack - context->Esp;
}
_EnterWin16Lock();
wine_call_to_16_regs( context, cbArgs, call16_handler );
_LeaveWin16Lock();
}
if (TRACE_ON(relay))
{
DPRINTF("%04lx:RetFrom16() ss:sp=%04x:%04x ",
GetCurrentThreadId(), SELECTOROF(NtCurrentTeb()->WOW32Reserved),
OFFSETOF(NtCurrentTeb()->WOW32Reserved));
DPRINTF(" ax=%04x bx=%04x cx=%04x dx=%04x bp=%04x sp=%04x\n",
(WORD)context->Eax, (WORD)context->Ebx, (WORD)context->Ecx,
(WORD)context->Edx, (WORD)context->Ebp, (WORD)context->Esp );
SYSLEVEL_CheckNotLevel( 2 );
}
}
else
{
DWORD ret;
if (TRACE_ON(relay))
{
DWORD count = cbArgs / sizeof(WORD);
WORD * wstack = (WORD *)stack;
DPRINTF("%04lx:CallTo16(func=%04x:%04x,ds=%04x",
GetCurrentThreadId(), HIWORD(vpfn16), LOWORD(vpfn16),
SELECTOROF(NtCurrentTeb()->WOW32Reserved) );
while (count) DPRINTF( ",%04x", wstack[--count] );
DPRINTF(") ss:sp=%04x:%04x\n",
SELECTOROF(NtCurrentTeb()->WOW32Reserved), OFFSETOF(NtCurrentTeb()->WOW32Reserved) );
SYSLEVEL_CheckNotLevel( 2 );
}
/* push return address */
stack -= sizeof(SEGPTR);
*((SEGPTR *)stack) = call16_ret_addr;
cbArgs += sizeof(SEGPTR);
/*
* Actually, we should take care whether the called routine cleans up
* its stack or not. Fortunately, our wine_call_to_16 core doesn't rely on
* the callee to do so; after the routine has returned, the 16-bit
* stack pointer is always reset to the position it had before.
*/
_EnterWin16Lock();
ret = wine_call_to_16( (FARPROC16)vpfn16, cbArgs, call16_handler );
if (pdwRetCode) *pdwRetCode = ret;
_LeaveWin16Lock();
if (TRACE_ON(relay))
{
DPRINTF("%04lx:RetFrom16() ss:sp=%04x:%04x retval=%08lx\n",
GetCurrentThreadId(), SELECTOROF(NtCurrentTeb()->WOW32Reserved),
OFFSETOF(NtCurrentTeb()->WOW32Reserved), ret);
SYSLEVEL_CheckNotLevel( 2 );
}
}
#else
assert(0); /* cannot call to 16-bit on non-Intel architectures */
#endif /* __i386__ */
return TRUE; /* success */
}
/**********************************************************************
* K32WOWCallback16Ex (KERNEL32.55)
*/
BOOL WINAPI K32WOWCallback16Ex( DWORD vpfn16, DWORD dwFlags,
DWORD cbArgs, LPVOID pArgs, LPDWORD pdwRetCode )
{
/*
* Arguments must be prepared in the correct order by the caller
* (both for PASCAL and CDECL calling convention), so we simply
* copy them to the 16-bit stack ...
*/
char *stack = (char *)CURRENT_STACK16 - cbArgs;
memcpy( stack, pArgs, cbArgs );
if (dwFlags & (WCB16_REGS|WCB16_REGS_LONG))
{
CONTEXT *context = (CONTEXT *)pdwRetCode;
if (TRACE_ON(relay))
{
DWORD count = cbArgs / sizeof(WORD);
WORD * wstack = (WORD *)stack;
TRACE_(relay)( "\1CallTo16(func=%04x:%04x", context->SegCs, LOWORD(context->Eip) );
while (count) TRACE_(relay)( ",%04x", wstack[--count] );
TRACE_(relay)( ") ss:sp=%04x:%04x ax=%04x bx=%04x cx=%04x dx=%04x si=%04x di=%04x bp=%04x ds=%04x es=%04x\n",
SELECTOROF(NtCurrentTeb()->WOW32Reserved),
OFFSETOF(NtCurrentTeb()->WOW32Reserved),
(WORD)context->Eax, (WORD)context->Ebx, (WORD)context->Ecx,
(WORD)context->Edx, (WORD)context->Esi, (WORD)context->Edi,
(WORD)context->Ebp, (WORD)context->SegDs, (WORD)context->SegEs );
SYSLEVEL_CheckNotLevel( 2 );
}
if (context->EFlags & 0x00020000) /* v86 mode */
{
EXCEPTION_REGISTRATION_RECORD frame;
frame.Handler = vm86_handler;
errno = 0;
__wine_push_frame( &frame );
__wine_enter_vm86( context );
__wine_pop_frame( &frame );
if (errno != 0) /* enter_vm86 will fail with ENOSYS on x64 kernels */
{
WARN("__wine_enter_vm86 failed (errno=%d)\n", errno);
if (errno == ENOSYS)
SetLastError(ERROR_NOT_SUPPORTED);
else
SetLastError(ERROR_GEN_FAILURE);
return FALSE;
}
}
else
{
/* push return address */
if (dwFlags & WCB16_REGS_LONG)
{
stack -= sizeof(DWORD);
*((DWORD *)stack) = HIWORD(call16_ret_addr);
stack -= sizeof(DWORD);
*((DWORD *)stack) = LOWORD(call16_ret_addr);
cbArgs += 2 * sizeof(DWORD);
}
else
{
stack -= sizeof(SEGPTR);
*((SEGPTR *)stack) = call16_ret_addr;
cbArgs += sizeof(SEGPTR);
}
/*
* Start call by checking for pending events.
* Note that wine_call_to_16_regs overwrites context stack
* pointer so we may modify it here without a problem.
*/
if (get_vm86_teb_info()->dpmi_vif)
{
context->SegSs = wine_get_ds();
context->Esp = (DWORD)stack;
insert_event_check( context );
cbArgs += (DWORD)stack - context->Esp;
}
_EnterWin16Lock();
wine_call_to_16_regs( context, cbArgs, call16_handler );
_LeaveWin16Lock();
}
if (TRACE_ON(relay))
{
TRACE_(relay)( "\1RetFrom16() ss:sp=%04x:%04x ax=%04x bx=%04x cx=%04x dx=%04x bp=%04x sp=%04x\n",
SELECTOROF(NtCurrentTeb()->WOW32Reserved),
OFFSETOF(NtCurrentTeb()->WOW32Reserved),
(WORD)context->Eax, (WORD)context->Ebx, (WORD)context->Ecx,
(WORD)context->Edx, (WORD)context->Ebp, (WORD)context->Esp );
SYSLEVEL_CheckNotLevel( 2 );
}
}
else
{
DWORD ret;
if (TRACE_ON(relay))
{
DWORD count = cbArgs / sizeof(WORD);
WORD * wstack = (WORD *)stack;
TRACE_(relay)( "\1CallTo16(func=%04x:%04x,ds=%04x",
HIWORD(vpfn16), LOWORD(vpfn16), SELECTOROF(NtCurrentTeb()->WOW32Reserved) );
while (count) TRACE_(relay)( ",%04x", wstack[--count] );
TRACE_(relay)( ") ss:sp=%04x:%04x\n", SELECTOROF(NtCurrentTeb()->WOW32Reserved),
OFFSETOF(NtCurrentTeb()->WOW32Reserved) );
SYSLEVEL_CheckNotLevel( 2 );
}
/* push return address */
stack -= sizeof(SEGPTR);
*((SEGPTR *)stack) = call16_ret_addr;
cbArgs += sizeof(SEGPTR);
/*
* Actually, we should take care whether the called routine cleans up
* its stack or not. Fortunately, our wine_call_to_16 core doesn't rely on
* the callee to do so; after the routine has returned, the 16-bit
* stack pointer is always reset to the position it had before.
*/
_EnterWin16Lock();
ret = wine_call_to_16( (FARPROC16)vpfn16, cbArgs, call16_handler );
if (pdwRetCode) *pdwRetCode = ret;
_LeaveWin16Lock();
if (TRACE_ON(relay))
{
TRACE_(relay)( "\1RetFrom16() ss:sp=%04x:%04x retval=%08x\n",
SELECTOROF(NtCurrentTeb()->WOW32Reserved),
OFFSETOF(NtCurrentTeb()->WOW32Reserved), ret );
SYSLEVEL_CheckNotLevel( 2 );
}
}
return TRUE; /* success */
}