4 * Copyright 1995 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
22 #include "wine/port.h"
39 #include "wine/winbase16.h"
41 #include "kernel16_private.h"
43 #include "wine/debug.h"
45 WINE_DEFAULT_DEBUG_CHANNEL(task);
57 /* Segment containing MakeProcInstance() thunks */
60 WORD next; /* Selector of next segment */
61 WORD magic; /* Thunks signature */
63 WORD free; /* Head of the free list */
64 struct thunk thunks[1];
69 #define THUNK_MAGIC ('P' | ('T' << 8))
71 /* Min. number of thunks allocated when creating a new segment */
74 #define TDB_MAGIC ('T' | ('D' << 8))
76 static THHOOK DefaultThhook;
77 THHOOK *pThhook = &DefaultThhook;
79 #define hFirstTask (pThhook->HeadTDB)
80 #define hLockedTask (pThhook->LockTDB)
82 static UINT16 nTaskCount = 0;
84 static HTASK16 initial_task, main_task;
86 /***********************************************************************
89 void TASK_InstallTHHook( THHOOK *pNewThhook )
91 THHOOK *pOldThhook = pThhook;
93 pThhook = pNewThhook? pNewThhook : &DefaultThhook;
95 *pThhook = *pOldThhook;
98 /***********************************************************************
101 static TDB *TASK_GetPtr( HTASK16 hTask )
103 return GlobalLock16( hTask );
107 /***********************************************************************
110 TDB *TASK_GetCurrent(void)
112 return TASK_GetPtr( GetCurrentTask() );
116 /***********************************************************************
119 static void TASK_LinkTask( HTASK16 hTask )
124 if (!(pTask = TASK_GetPtr( hTask ))) return;
125 prevTask = &hFirstTask;
128 TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
129 if (prevTaskPtr->priority >= pTask->priority) break;
130 prevTask = &prevTaskPtr->hNext;
132 pTask->hNext = *prevTask;
138 /***********************************************************************
141 static void TASK_UnlinkTask( HTASK16 hTask )
146 prevTask = &hFirstTask;
147 while (*prevTask && (*prevTask != hTask))
149 pTask = TASK_GetPtr( *prevTask );
150 prevTask = &pTask->hNext;
154 pTask = TASK_GetPtr( *prevTask );
155 *prevTask = pTask->hNext;
162 /***********************************************************************
165 * Create a thunk free-list in segment 'handle', starting from offset 'offset'
166 * and containing 'count' entries.
168 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
173 pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
175 pThunk->magic = THUNK_MAGIC;
176 pThunk->free = FIELD_OFFSET( THUNKS, thunks );
177 for (i = 0; i < count-1; i++)
178 *(WORD *)&pThunk->thunks[i] = FIELD_OFFSET( THUNKS, thunks[i+1] );
179 *(WORD *)&pThunk->thunks[i] = 0; /* Last thunk */
183 /***********************************************************************
186 * Allocate a thunk for MakeProcInstance().
188 static SEGPTR TASK_AllocThunk(void)
194 if (!(pTask = TASK_GetCurrent())) return 0;
195 sel = pTask->hCSAlias;
196 pThunk = (THUNKS *)pTask->thunks;
197 base = (char *)pThunk - (char *)pTask;
198 while (!pThunk->free)
201 if (!sel) /* Allocate a new segment */
203 sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
204 pTask->hPDB, WINE_LDT_FLAGS_CODE );
206 TASK_CreateThunks( sel, 0, MIN_THUNKS );
209 pThunk = GlobalLock16( sel );
212 base += pThunk->free;
213 pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
214 return MAKESEGPTR( sel, base );
218 /***********************************************************************
221 * Free a MakeProcInstance() thunk.
223 static BOOL TASK_FreeThunk( SEGPTR thunk )
229 if (!(pTask = TASK_GetCurrent())) return 0;
230 sel = pTask->hCSAlias;
231 pThunk = (THUNKS *)pTask->thunks;
232 base = (char *)pThunk - (char *)pTask;
233 while (sel && (sel != HIWORD(thunk)))
236 pThunk = GlobalLock16( sel );
239 if (!sel) return FALSE;
240 *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
241 pThunk->free = LOWORD(thunk) - base;
246 /***********************************************************************
249 * NOTE: This routine might be called by a Win32 thread. Thus, we need
250 * to be careful to protect global data structures. We do this
251 * by entering the Win16Lock while linking the task into the
254 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, LPCSTR cmdline, BYTE len )
259 char curdir[MAX_PATH];
260 HMODULE16 hModule = pModule ? pModule->self : 0;
262 /* Allocate the task structure */
264 hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
265 if (!hTask) return NULL;
266 pTask = TASK_GetPtr( hTask );
267 FarSetOwner16( hTask, hModule );
269 /* Fill the task structure */
271 pTask->hSelf = hTask;
273 pTask->version = pModule ? pModule->ne_expver : 0x0400;
274 pTask->hModule = hModule;
275 pTask->hParent = GetCurrentTask();
276 pTask->magic = TDB_MAGIC;
277 pTask->nCmdShow = cmdShow;
279 GetCurrentDirectoryA( sizeof(curdir), curdir );
280 GetShortPathNameA( curdir, curdir, sizeof(curdir) );
281 pTask->curdrive = (curdir[0] - 'A') | 0x80;
282 lstrcpynA( pTask->curdir, curdir + 2, sizeof(pTask->curdir) );
284 /* Create the thunks block */
286 TASK_CreateThunks( hTask, (char *)pTask->thunks - (char *)pTask, 7 );
288 /* Copy the module name */
292 char name[sizeof(pTask->module_name)+1];
294 GetModuleName16( hModule, name, sizeof(name) );
295 len = strlen(name) + 1;
296 memcpy(pTask->module_name, name, min(len,sizeof(pTask->module_name)));
297 pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
300 /* Allocate a selector for the PDB */
302 pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
303 hModule, WINE_LDT_FLAGS_DATA );
307 pTask->pdb.int20 = 0x20cd;
308 pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */
309 proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
310 memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
311 pTask->pdb.savedint22 = 0;
312 pTask->pdb.savedint23 = 0;
313 pTask->pdb.savedint24 = 0;
314 pTask->pdb.fileHandlesPtr =
315 MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), FIELD_OFFSET( PDB16, fileHandles ));
316 pTask->pdb.hFileHandles = 0;
317 memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
318 /* FIXME: should we make a copy of the environment? */
319 pTask->pdb.environment = SELECTOROF(GetDOSEnvironment16());
320 pTask->pdb.nbFiles = 20;
322 /* Fill the command line */
326 cmdline = GetCommandLineA();
327 /* remove the first word (program name) */
329 if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
330 while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
331 while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
332 len = strlen(cmdline);
334 if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
335 pTask->pdb.cmdLine[0] = len;
336 memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
337 /* pTask->pdb.cmdLine[len+1] = 0; */
339 TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
341 /* Allocate a code segment alias for the TDB */
343 pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, pTask, sizeof(TDB),
344 pTask->hPDB, WINE_LDT_FLAGS_CODE );
346 /* Default DTA overwrites command line */
348 pTask->dta = MAKESEGPTR( pTask->hPDB, FIELD_OFFSET( PDB16, cmdLine ));
350 /* Create scheduler event for 16-bit tasks */
352 if ( !(pTask->flags & TDBF_WIN32) )
353 NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, NotificationEvent, FALSE );
355 if (!initial_task) initial_task = hTask;
361 /***********************************************************************
364 static void TASK_DeleteTask( HTASK16 hTask )
369 if (!(pTask = TASK_GetPtr( hTask ))) return;
372 pTask->magic = 0xdead; /* invalidate signature */
374 /* Free the selector aliases */
376 GLOBAL_FreeBlock( pTask->hCSAlias );
377 GLOBAL_FreeBlock( pTask->hPDB );
379 /* Free the task module */
381 FreeModule16( pTask->hModule );
383 /* Free the task structure itself */
385 GlobalFree16( hTask );
387 /* Free all memory used by this task (including the 32-bit stack, */
388 /* the environment block and the thunk segments). */
390 GlobalFreeAll16( hPDB );
394 /***********************************************************************
395 * TASK_CreateMainTask
397 * Create a task for the main (32-bit) process.
399 void TASK_CreateMainTask(void)
402 STARTUPINFOA startup_info;
403 UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
405 GetStartupInfoA( &startup_info );
406 if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
407 pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
410 ERR("could not create task for main process\n");
414 pTask->flags |= TDBF_WIN32;
415 pTask->hInstance = 0;
416 pTask->hPrevInstance = 0;
417 pTask->teb = NtCurrentTeb();
419 /* Add the task to the linked list */
420 /* (no need to get the win16 lock, we are the only thread at this point) */
421 TASK_LinkTask( pTask->hSelf );
422 main_task = pTask->hSelf;
429 WIN16_SUBSYSTEM_TIB *tib;
432 /* allocate the win16 TIB for a new 16-bit task */
433 static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
435 WCHAR path[MAX_PATH];
436 WIN16_SUBSYSTEM_TIB *tib;
437 UNICODE_STRING *curdir;
438 NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
440 if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
441 MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
442 GetLongPathNameW( path, path, MAX_PATH );
443 if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
444 else tib->exe_name = NULL;
447 if (NtCurrentTeb()->Tib.SubSystemTib)
448 curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
450 curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
451 tib->curdir.DosPath.MaximumLength = sizeof(tib->curdir_buffer);
452 tib->curdir.DosPath.Length = min( curdir->Length, tib->curdir.DosPath.MaximumLength-sizeof(WCHAR) );
453 tib->curdir.DosPath.Buffer = tib->curdir_buffer;
454 tib->curdir.Handle = 0;
455 memcpy( tib->curdir_buffer, curdir->Buffer, tib->curdir.DosPath.Length );
456 tib->curdir_buffer[tib->curdir.DosPath.Length/sizeof(WCHAR)] = 0;
461 static inline void free_win16_tib( WIN16_SUBSYSTEM_TIB *tib )
463 if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
464 HeapFree( GetProcessHeap(), 0, tib );
467 /* startup routine for a new 16-bit thread */
468 static DWORD CALLBACK task_start( LPVOID p )
470 struct create_data *data = p;
471 TDB *pTask = data->task;
474 kernel_get_thread_data()->htask16 = pTask->hSelf;
475 NtCurrentTeb()->Tib.SubSystemTib = data->tib;
476 HeapFree( GetProcessHeap(), 0, data );
479 TASK_LinkTask( pTask->hSelf );
480 pTask->teb = NtCurrentTeb();
481 ret = NE_StartTask();
487 /***********************************************************************
490 * Spawn a new 16-bit task.
492 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
493 LPCSTR cmdline, BYTE len, HANDLE *hThread )
495 struct create_data *data = NULL;
496 WIN16_SUBSYSTEM_TIB *tib;
499 if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
500 if (!(tib = allocate_win16_tib( pTask ))) goto failed;
501 if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data)))) goto failed;
504 if (!(*hThread = CreateThread( NULL, 0, task_start, data, 0, NULL ))) goto failed;
508 if (tib) free_win16_tib( tib );
509 HeapFree( GetProcessHeap(), 0, data );
510 TASK_DeleteTask( pTask->hSelf );
515 /***********************************************************************
516 * TASK_GetTaskFromThread
518 HTASK16 TASK_GetTaskFromThread( DWORD thread )
520 TDB *p = TASK_GetPtr( hFirstTask );
523 if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
524 p = TASK_GetPtr( p->hNext );
530 /***********************************************************************
531 * TASK_CallTaskSignalProc
533 static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
536 TDB *pTask = TASK_GetCurrent();
538 if ( !pTask || !pTask->userhandler ) return;
540 args[4] = hTaskOrModule;
543 args[1] = pTask->hInstance;
544 args[0] = pTask->hQueue;
545 WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
549 /***********************************************************************
552 void TASK_ExitTask(void)
554 WIN16_SUBSYSTEM_TIB *tib;
558 /* Enter the Win16Lock to protect global data structures */
561 pTask = TASK_GetCurrent();
568 TRACE("Killing task %04x\n", pTask->hSelf );
570 /* Perform USER cleanup */
572 TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
574 /* Remove the task from the list to be sure we never switch back to it */
575 TASK_UnlinkTask( pTask->hSelf );
577 if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
579 TRACE("this is the last task, exiting\n" );
585 if ( hLockedTask == pTask->hSelf )
588 TASK_DeleteTask( pTask->hSelf );
590 if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
592 free_win16_tib( tib );
593 NtCurrentTeb()->Tib.SubSystemTib = NULL;
596 /* ... and completely release the Win16Lock, just in case. */
597 ReleaseThunkLock( &lockCount );
601 /***********************************************************************
602 * ExitKernel (KERNEL.2)
604 * Clean-up everything and exit the Wine process.
606 void WINAPI ExitKernel16(void)
608 WriteOutProfiles16();
609 TerminateProcess( GetCurrentProcess(), 0 );
613 /***********************************************************************
614 * InitTask (KERNEL.91)
616 * Called by the application startup code.
618 void WINAPI InitTask16( CONTEXT *context )
621 INSTANCEDATA *pinstance;
625 if (!(pTask = TASK_GetCurrent())) return;
627 /* Note: we need to trust that BX/CX contain the stack/heap sizes,
628 as some apps, notably Visual Basic apps, *modify* the heap/stack
629 size of the instance data segment before calling InitTask() */
631 /* Initialize the INSTANCEDATA structure */
632 pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
633 pinstance->stackmin = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + sizeof( STACK16FRAME );
634 pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
635 pinstance->stacktop = ( pinstance->stackmin > LOWORD(context->Ebx) ?
636 pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
638 /* Initialize the local heap */
639 if (LOWORD(context->Ecx))
640 LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
642 /* Initialize implicitly loaded DLLs */
643 NE_InitializeDLLs( pTask->hModule );
644 NE_DllProcessAttach( pTask->hModule );
646 /* Registers on return are:
647 * ax 1 if OK, 0 on error
648 * cx stack limit in bytes
649 * dx cmdShow parameter
650 * si instance handle of the previous instance
651 * di instance handle of the new task
652 * es:bx pointer to command line inside PSP
654 * 0 (=%bp) is pushed on the stack
656 ptr = stack16_push( sizeof(WORD) );
657 *(WORD *)MapSL(ptr) = 0;
662 if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
665 LPBYTE p = &pTask->pdb.cmdLine[1];
666 while ((*p == ' ') || (*p == '\t')) p++;
667 context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
669 context->Ecx = pinstance->stacktop;
670 context->Edx = pTask->nCmdShow;
671 context->Esi = (DWORD)pTask->hPrevInstance;
672 context->Edi = (DWORD)pTask->hInstance;
673 context->SegEs = (WORD)pTask->hPDB;
677 /***********************************************************************
678 * WaitEvent (KERNEL.30)
680 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
684 if (!hTask) hTask = GetCurrentTask();
685 pTask = TASK_GetPtr( hTask );
687 if (pTask->flags & TDBF_WIN32)
689 FIXME("called for Win32 thread (%04x)!\n", GetCurrentThreadId());
693 if (pTask->nEvents > 0)
699 if (pTask->teb == NtCurrentTeb())
703 NtResetEvent( pTask->hEvent, NULL );
704 ReleaseThunkLock( &lockCount );
705 SYSLEVEL_CheckNotLevel( 1 );
706 WaitForSingleObject( pTask->hEvent, INFINITE );
707 RestoreThunkLock( lockCount );
708 if (pTask->nEvents > 0) pTask->nEvents--;
710 else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
716 /***********************************************************************
717 * PostEvent (KERNEL.31)
719 void WINAPI PostEvent16( HTASK16 hTask )
723 if (!hTask) hTask = GetCurrentTask();
724 if (!(pTask = TASK_GetPtr( hTask ))) return;
726 if (pTask->flags & TDBF_WIN32)
728 FIXME("called for Win32 thread (%04x)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
734 if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
738 /***********************************************************************
739 * SetPriority (KERNEL.32)
741 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
746 if (!hTask) hTask = GetCurrentTask();
747 if (!(pTask = TASK_GetPtr( hTask ))) return;
748 newpriority = pTask->priority + delta;
749 if (newpriority < -32) newpriority = -32;
750 else if (newpriority > 15) newpriority = 15;
752 pTask->priority = newpriority + 1;
753 TASK_UnlinkTask( pTask->hSelf );
754 TASK_LinkTask( pTask->hSelf );
759 /***********************************************************************
760 * LockCurrentTask (KERNEL.33)
762 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
764 if (bLock) hLockedTask = GetCurrentTask();
765 else hLockedTask = 0;
770 /***********************************************************************
771 * IsTaskLocked (KERNEL.122)
773 HTASK16 WINAPI IsTaskLocked16(void)
779 /***********************************************************************
780 * OldYield (KERNEL.117)
782 void WINAPI OldYield16(void)
786 ReleaseThunkLock(&count);
787 RestoreThunkLock(count);
790 /***********************************************************************
791 * WIN32_OldYield (KERNEL.447)
793 void WINAPI WIN32_OldYield16(void)
797 ReleaseThunkLock(&count);
798 RestoreThunkLock(count);
801 /***********************************************************************
802 * DirectedYield (KERNEL.150)
804 void WINAPI DirectedYield16( HTASK16 hTask )
809 /***********************************************************************
812 void WINAPI Yield16(void)
814 TDB *pCurTask = TASK_GetCurrent();
816 if (pCurTask && pCurTask->hQueue)
818 HMODULE mod = GetModuleHandleA( "user32.dll" );
821 BOOL (WINAPI *pPeekMessageW)( MSG *msg, HWND hwnd, UINT first, UINT last, UINT flags );
822 pPeekMessageW = (void *)GetProcAddress( mod, "PeekMessageW" );
826 pPeekMessageW( &msg, 0, 0, 0, PM_REMOVE | PM_QS_SENDMESSAGE );
834 /***********************************************************************
835 * KERNEL_490 (KERNEL.490)
837 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
839 if ( !someTask ) return 0;
841 FIXME("(%04x): stub\n", someTask );
845 /***********************************************************************
846 * MakeProcInstance (KERNEL.51)
848 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
853 WORD hInstanceSelector;
855 hInstanceSelector = GlobalHandleToSel16(hInstance);
857 TRACE("(%p, %04x);\n", func, hInstance);
860 /* Win95 actually protects via SEH, but this is better for debugging */
861 WARN("Ouch ! Called with invalid func %p !\n", func);
865 if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
867 && (hInstance != 0xffff) )
869 /* calling MPI with a foreign DSEG is invalid ! */
870 WARN("Problem with hInstance? Got %04x, using %04x instead\n",
871 hInstance,CURRENT_DS);
874 /* Always use the DSEG that MPI was entered with.
875 * We used to set hInstance to GetTaskDS16(), but this should be wrong
876 * as CURRENT_DS provides the DSEG value we need.
877 * ("calling" DS, *not* "task" DS !) */
878 hInstanceSelector = CURRENT_DS;
879 hInstance = GlobalHandle16(hInstanceSelector);
881 /* no thunking for DLLs */
882 if (NE_GetPtr(FarGetOwner16(hInstance))->ne_flags & NE_FFLAGS_LIBMODULE)
885 thunkaddr = TASK_AllocThunk();
886 if (!thunkaddr) return NULL;
887 thunk = MapSL( thunkaddr );
888 lfunc = MapSL( (SEGPTR)func );
890 TRACE("(%p,%04x): got thunk %08x\n", func, hInstance, thunkaddr );
891 if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
892 ((lfunc[0]==0x1e) && (lfunc[1]==0x58)) /* pushw %ds, popw %ax */
894 WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
897 thunk->movw = 0xb8; /* movw instance, %ax */
898 thunk->instance = hInstanceSelector;
899 thunk->ljmp = 0xea; /* ljmp func */
901 return (FARPROC16)thunkaddr;
902 /* CX reg indicates if thunkaddr != NULL, implement if needed */
906 /***********************************************************************
907 * FreeProcInstance (KERNEL.52)
909 void WINAPI FreeProcInstance16( FARPROC16 func )
911 TRACE("(%p)\n", func );
912 TASK_FreeThunk( (SEGPTR)func );
915 /**********************************************************************
916 * TASK_GetCodeSegment
918 * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
919 * and logical segment number of a given code segment.
921 * 'proc' either *is* already a pair of module handle and segment number,
922 * in which case there's nothing to do. Otherwise, it is a pointer to
923 * a function, and we need to retrieve the code segment. If the pointer
924 * happens to point to a thunk, we'll retrieve info about the code segment
925 * where the function pointed to by the thunk resides, not the thunk itself.
927 * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
928 * the function the snoop code will return to ...
931 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
932 SEGTABLEENTRY **ppSeg, int *pSegNr )
934 NE_MODULE *pModule = NULL;
935 SEGTABLEENTRY *pSeg = NULL;
938 /* Try pair of module handle / segment number */
939 pModule = GlobalLock16( HIWORD( proc ) );
940 if ( pModule && pModule->ne_magic == IMAGE_OS2_SIGNATURE )
942 segNr = LOWORD( proc );
943 if ( segNr && segNr <= pModule->ne_cseg )
944 pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
947 /* Try thunk or function */
950 BYTE *thunk = MapSL( (SEGPTR)proc );
953 if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
954 selector = thunk[6] + (thunk[7] << 8);
956 selector = HIWORD( proc );
958 pModule = NE_GetPtr( GlobalHandle16( selector ) );
959 pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
962 for ( segNr = 1; segNr <= pModule->ne_cseg; segNr++, pSeg++ )
963 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
966 if ( pModule && segNr > pModule->ne_cseg )
970 /* Abort if segment not found */
972 if ( !pModule || !pSeg )
975 /* Return segment data */
977 if ( ppModule ) *ppModule = pModule;
978 if ( ppSeg ) *ppSeg = pSeg;
979 if ( pSegNr ) *pSegNr = segNr;
984 /**********************************************************************
985 * GetCodeHandle (KERNEL.93)
987 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
991 if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
997 /**********************************************************************
998 * GetCodeInfo (KERNEL.104)
1000 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
1003 SEGTABLEENTRY *pSeg;
1006 if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
1009 /* Fill in segment information */
1011 segInfo->offSegment = pSeg->filepos;
1012 segInfo->cbSegment = pSeg->size;
1013 segInfo->flags = pSeg->flags;
1014 segInfo->cbAlloc = pSeg->minsize;
1015 segInfo->h = pSeg->hSeg;
1016 segInfo->alignShift = pModule->ne_align;
1018 if ( segNr == pModule->ne_autodata )
1019 segInfo->cbAlloc += pModule->ne_heap + pModule->ne_stack;
1021 /* Return module handle in %es */
1023 CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1029 /**********************************************************************
1030 * DefineHandleTable (KERNEL.94)
1032 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1034 FIXME("(%04x): stub ?\n", wOffset);
1039 /***********************************************************************
1040 * SetTaskQueue (KERNEL.34)
1042 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1044 FIXME( "stub, should not get called\n" );
1049 /***********************************************************************
1050 * GetTaskQueue (KERNEL.35)
1052 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1054 FIXME( "stub, should not get called\n" );
1058 /***********************************************************************
1059 * SetThreadQueue (KERNEL.463)
1061 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1063 FIXME( "stub, should not get called\n" );
1067 /***********************************************************************
1068 * GetThreadQueue (KERNEL.464)
1070 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1072 FIXME( "stub, should not get called\n" );
1076 /***********************************************************************
1077 * SetFastQueue (KERNEL.624)
1079 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1081 FIXME( "stub, should not get called\n" );
1084 /***********************************************************************
1085 * GetFastQueue (KERNEL.625)
1087 HQUEUE16 WINAPI GetFastQueue16( void )
1089 FIXME( "stub, should not get called\n" );
1093 /***********************************************************************
1094 * SwitchStackTo (KERNEL.108)
1096 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1098 STACK16FRAME *oldFrame, *newFrame;
1099 INSTANCEDATA *pData;
1102 if (!(pData = GlobalLock16( seg ))) return;
1103 TRACE("old=%04x:%04x new=%04x:%04x\n",
1104 SELECTOROF( NtCurrentTeb()->WOW32Reserved ),
1105 OFFSETOF( NtCurrentTeb()->WOW32Reserved ), seg, ptr );
1107 /* Save the old stack */
1109 oldFrame = CURRENT_STACK16;
1110 /* pop frame + args and push bp */
1111 pData->old_ss_sp = (SEGPTR)NtCurrentTeb()->WOW32Reserved + sizeof(STACK16FRAME)
1113 *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1114 pData->stacktop = top;
1115 pData->stackmin = ptr;
1116 pData->stackbottom = ptr;
1118 /* Switch to the new stack */
1120 /* Note: we need to take the 3 arguments into account; otherwise,
1121 * the stack will underflow upon return from this function.
1123 copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1124 copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1125 NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR( seg, ptr - copySize );
1126 newFrame = CURRENT_STACK16;
1128 /* Copy the stack frame and the local variables to the new stack */
1130 memmove( newFrame, oldFrame, copySize );
1132 *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0; /* clear previous bp */
1136 /***********************************************************************
1137 * SwitchStackBack (KERNEL.109)
1139 void WINAPI SwitchStackBack16( CONTEXT *context )
1141 STACK16FRAME *oldFrame, *newFrame;
1142 INSTANCEDATA *pData;
1144 if (!(pData = GlobalLock16(SELECTOROF(NtCurrentTeb()->WOW32Reserved))))
1146 if (!pData->old_ss_sp)
1148 WARN("No previous SwitchStackTo\n" );
1151 TRACE("restoring stack %04x:%04x\n",
1152 SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1154 oldFrame = CURRENT_STACK16;
1156 /* Pop bp from the previous stack */
1158 context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1159 pData->old_ss_sp += sizeof(WORD);
1161 /* Switch back to the old stack */
1163 NtCurrentTeb()->WOW32Reserved = (void *)(pData->old_ss_sp - sizeof(STACK16FRAME));
1164 context->SegSs = SELECTOROF(pData->old_ss_sp);
1165 context->Esp = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1166 pData->old_ss_sp = 0;
1168 /* Build a stack frame for the return */
1170 newFrame = CURRENT_STACK16;
1171 newFrame->frame32 = oldFrame->frame32;
1172 newFrame->module_cs = oldFrame->module_cs;
1173 newFrame->callfrom_ip = oldFrame->callfrom_ip;
1174 newFrame->entry_ip = oldFrame->entry_ip;
1178 /***********************************************************************
1179 * GetTaskQueueDS (KERNEL.118)
1181 void WINAPI GetTaskQueueDS16(void)
1183 CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1187 /***********************************************************************
1188 * GetTaskQueueES (KERNEL.119)
1190 void WINAPI GetTaskQueueES16(void)
1192 CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1196 /***********************************************************************
1197 * GetCurrentTask (KERNEL32.@)
1199 HTASK16 WINAPI GetCurrentTask(void)
1201 HTASK16 ret = kernel_get_thread_data()->htask16;
1202 if (!ret) ret = main_task;
1206 /***********************************************************************
1207 * GetCurrentTask (KERNEL.36)
1209 DWORD WINAPI WIN16_GetCurrentTask(void)
1211 /* This is the version used by relay code; the first task is */
1212 /* returned in the high word of the result */
1213 return MAKELONG( GetCurrentTask(), hFirstTask );
1217 /***********************************************************************
1218 * GetCurrentPDB (KERNEL.37)
1220 * UNDOC: returns PSP of KERNEL in high word
1222 DWORD WINAPI GetCurrentPDB16(void)
1226 if (!(pTask = TASK_GetCurrent())) return 0;
1227 return MAKELONG(pTask->hPDB, 0); /* FIXME */
1231 /***********************************************************************
1232 * GetCurPID (KERNEL.157)
1234 DWORD WINAPI GetCurPID16( DWORD unused )
1240 /***********************************************************************
1241 * GetInstanceData (KERNEL.54)
1243 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1245 char *ptr = GlobalLock16( instance );
1246 if (!ptr || !len) return 0;
1247 if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1248 memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1253 /***********************************************************************
1254 * GetExeVersion (KERNEL.105)
1256 WORD WINAPI GetExeVersion16(void)
1260 if (!(pTask = TASK_GetCurrent())) return 0;
1261 return pTask->version;
1265 /***********************************************************************
1266 * SetErrorMode (KERNEL.107)
1268 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1271 if (!(pTask = TASK_GetCurrent())) return 0;
1272 pTask->error_mode = mode;
1273 return SetErrorMode( mode );
1277 /***********************************************************************
1278 * GetNumTasks (KERNEL.152)
1280 UINT16 WINAPI GetNumTasks16(void)
1286 /***********************************************************************
1287 * GetTaskDS (KERNEL.155)
1289 * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1290 * I don't think we need to bother with this.
1292 HINSTANCE16 WINAPI GetTaskDS16(void)
1296 if (!(pTask = TASK_GetCurrent())) return 0;
1297 return GlobalHandleToSel16(pTask->hInstance);
1300 /***********************************************************************
1301 * GetDummyModuleHandleDS (KERNEL.602)
1303 WORD WINAPI GetDummyModuleHandleDS16(void)
1308 if (!(pTask = TASK_GetCurrent())) return 0;
1309 if (!(pTask->flags & TDBF_WIN32)) return 0;
1310 selector = GlobalHandleToSel16( pTask->hModule );
1311 CURRENT_DS = selector;
1315 /***********************************************************************
1316 * IsTask (KERNEL.320)
1318 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1322 if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1323 if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1324 return (pTask->magic == TDB_MAGIC);
1328 /***********************************************************************
1329 * IsWinOldApTask (KERNEL.158)
1331 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1333 /* should return bit 0 of byte 0x48 in PSP */
1337 /***********************************************************************
1338 * SetTaskSignalProc (KERNEL.38)
1340 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1345 if (!hTask) hTask = GetCurrentTask();
1346 if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1347 oldProc = pTask->userhandler;
1348 pTask->userhandler = proc;
1352 /***********************************************************************
1353 * SetSigHandler (KERNEL.140)
1355 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1356 UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1358 FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1359 newhandler,oldhandler,oldmode,newmode,flag );
1361 if (flag != 1) return 0;
1362 if (!newmode) newhandler = NULL; /* Default handler */
1367 if (!(pTask = TASK_GetCurrent())) return 0;
1368 if (oldmode) *oldmode = pTask->signal_flags;
1369 pTask->signal_flags = newmode;
1370 if (oldhandler) *oldhandler = pTask->sighandler;
1371 pTask->sighandler = newhandler;
1377 /***********************************************************************
1378 * GlobalNotify (KERNEL.154)
1380 * Note that GlobalNotify does _not_ return the old NotifyProc
1381 * -- contrary to LocalNotify !!
1383 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1387 if (!(pTask = TASK_GetCurrent())) return;
1388 pTask->discardhandler = proc;
1392 /***********************************************************************
1395 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1400 /* Check for module handle */
1402 if (!(ptr = GlobalLock16( handle ))) return 0;
1403 if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return handle;
1405 /* Search for this handle inside all tasks */
1407 *hTask = hFirstTask;
1410 TDB *pTask = TASK_GetPtr( *hTask );
1411 if ((*hTask == handle) ||
1412 (pTask->hInstance == handle) ||
1413 (pTask->hQueue == handle) ||
1414 (pTask->hPDB == handle)) return pTask->hModule;
1415 *hTask = pTask->hNext;
1418 /* Check the owner for module handle */
1420 owner = FarGetOwner16( handle );
1421 if (!(ptr = GlobalLock16( owner ))) return 0;
1422 if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return owner;
1424 /* Search for the owner inside all tasks */
1426 *hTask = hFirstTask;
1429 TDB *pTask = TASK_GetPtr( *hTask );
1430 if ((*hTask == owner) ||
1431 (pTask->hInstance == owner) ||
1432 (pTask->hQueue == owner) ||
1433 (pTask->hPDB == owner)) return pTask->hModule;
1434 *hTask = pTask->hNext;
1440 /***********************************************************************
1441 * GetExePtr (KERNEL.133)
1443 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1446 HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1447 STACK16FRAME *frame = CURRENT_STACK16;
1448 frame->ecx = hModule;
1449 if (hTask) frame->es = hTask;
1454 /***********************************************************************
1457 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1460 return GetExePtrHelper( handle, &hTask );
1464 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1466 /**************************************************************************
1467 * FatalAppExit (KERNEL.137)
1469 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1471 TDB *pTask = TASK_GetCurrent();
1473 if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1475 HMODULE mod = GetModuleHandleA( "user32.dll" );
1478 MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1481 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1485 ERR( "%s\n", debugstr_a(str) );
1492 /***********************************************************************
1493 * GetAppCompatFlags (KERNEL.354)
1495 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1499 if (!hTask) hTask = GetCurrentTask();
1500 if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1501 if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1502 return pTask->compat_flags;
1506 /***********************************************************************
1507 * GetDOSEnvironment (KERNEL.131)
1509 * Note: the environment is allocated once, it doesn't track changes
1510 * made using the Win32 API. This shouldn't matter.
1512 * Format of a 16-bit environment block:
1513 * ASCIIZ string 1 (xx=yy format)
1518 * ASCIIZ program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
1520 SEGPTR WINAPI GetDOSEnvironment16(void)
1522 static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
1523 static HGLOBAL16 handle; /* handle to the 16 bit environment */
1530 p = env = GetEnvironmentStringsA();
1531 while (*p) p += strlen(p) + 1;
1532 p++; /* skip last null */
1533 size = (p - env) + sizeof(WORD) + sizeof(ENV_program_name);
1534 handle = GlobalAlloc16( GMEM_FIXED, size );
1538 LPSTR env16 = GlobalLock16( handle );
1539 memcpy( env16, env, p - env );
1540 memcpy( env16 + (p - env), &one, sizeof(one));
1541 memcpy( env16 + (p - env) + sizeof(WORD), ENV_program_name, sizeof(ENV_program_name));
1542 GlobalUnlock16( handle );
1544 FreeEnvironmentStringsA( env );
1546 return WOWGlobalLock16( handle );