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Bugfix: really *do* switch to the initial task's stack.
[wine.git] / loader / task.c
blob20b430ef7142c5c2777ac66518f0bc032bb9e0bf
1 /*
2 * Task functions
3 *
4 * Copyright 1995 Alexandre Julliard
5 */
6
7 #include <stdlib.h>
8 #include <string.h>
9 #include <assert.h>
10
11 #include "windows.h"
12 #include "user.h"
13 #include "callback.h"
14 #include "drive.h"
15 #include "file.h"
16 #include "global.h"
17 #include "instance.h"
18 #include "message.h"
19 #include "miscemu.h"
20 #include "module.h"
21 #include "neexe.h"
22 #include "peexe.h"
23 #include "pe_image.h"
24 #include "process.h"
25 #include "queue.h"
26 #include "selectors.h"
27 #include "stackframe.h"
28 #include "task.h"
29 #include "thread.h"
30 #include "toolhelp.h"
31 #include "winnt.h"
32 #include "winsock.h"
33 #include "thread.h"
34 #include "syslevel.h"
35 #include "debug.h"
36 #include "dosexe.h"
37 #include "dde_proc.h"
38 #include "server.h"
39
40 /* Min. number of thunks allocated when creating a new segment */
41 #define MIN_THUNKS 32
42
43 /* Pointer to function to switch to a larger stack */
44 int (*IF1632_CallLargeStack)( int (*func)(), void *arg ) = NULL;
45
46
47 static THHOOK DefaultThhook = { 0 };
48 THHOOK *pThhook = &DefaultThhook;
49
50 #define hCurrentTask (pThhook->CurTDB)
51 #define hFirstTask (pThhook->HeadTDB)
52 #define hLockedTask (pThhook->LockTDB)
53
54 static HTASK16 hTaskToKill = 0;
55 static UINT16 nTaskCount = 0;
56
57 static void TASK_YieldToSystem(TDB*);
58
59 extern BOOL32 THREAD_InitDone;
60
61
62 /***********************************************************************
63 * TASK_InstallTHHook
64 */
65 void TASK_InstallTHHook( THHOOK *pNewThhook )
66 {
67 THHOOK *pOldThhook = pThhook;
68
69 pThhook = pNewThhook? pNewThhook : &DefaultThhook;
70
71 *pThhook = *pOldThhook;
72 }
73
74 /***********************************************************************
75 * TASK_GetNextTask
76 */
77 HTASK16 TASK_GetNextTask( HTASK16 hTask )
78 {
79 TDB* pTask = (TDB*)GlobalLock16(hTask);
80
81 if (pTask->hNext) return pTask->hNext;
82 return (hFirstTask != hTask) ? hFirstTask : 0;
83 }
84
85 /***********************************************************************
86 * TASK_LinkTask
87 */
88 static void TASK_LinkTask( HTASK16 hTask )
89 {
90 HTASK16 *prevTask;
91 TDB *pTask;
92
93 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
94 prevTask = &hFirstTask;
95 while (*prevTask)
96 {
97 TDB *prevTaskPtr = (TDB *)GlobalLock16( *prevTask );
98 if (prevTaskPtr->priority >= pTask->priority) break;
99 prevTask = &prevTaskPtr->hNext;
100 }
101 pTask->hNext = *prevTask;
102 *prevTask = hTask;
103 nTaskCount++;
104 }
105
106
107 /***********************************************************************
108 * TASK_UnlinkTask
109 */
110 static void TASK_UnlinkTask( HTASK16 hTask )
111 {
112 HTASK16 *prevTask;
113 TDB *pTask;
114
115 prevTask = &hFirstTask;
116 while (*prevTask && (*prevTask != hTask))
117 {
118 pTask = (TDB *)GlobalLock16( *prevTask );
119 prevTask = &pTask->hNext;
120 }
121 if (*prevTask)
122 {
123 pTask = (TDB *)GlobalLock16( *prevTask );
124 *prevTask = pTask->hNext;
125 pTask->hNext = 0;
126 nTaskCount--;
127 }
128 }
129
130
131 /***********************************************************************
132 * TASK_CreateThunks
133 *
134 * Create a thunk free-list in segment 'handle', starting from offset 'offset'
135 * and containing 'count' entries.
136 */
137 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
138 {
139 int i;
140 WORD free;
141 THUNKS *pThunk;
142
143 pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
144 pThunk->next = 0;
145 pThunk->magic = THUNK_MAGIC;
146 pThunk->free = (int)&pThunk->thunks - (int)pThunk;
147 free = pThunk->free;
148 for (i = 0; i < count-1; i++)
149 {
150 free += 8; /* Offset of next thunk */
151 pThunk->thunks[4*i] = free;
152 }
153 pThunk->thunks[4*i] = 0; /* Last thunk */
154 }
155
156
157 /***********************************************************************
158 * TASK_AllocThunk
159 *
160 * Allocate a thunk for MakeProcInstance().
161 */
162 static SEGPTR TASK_AllocThunk( HTASK16 hTask )
163 {
164 TDB *pTask;
165 THUNKS *pThunk;
166 WORD sel, base;
167
168 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
169 sel = pTask->hCSAlias;
170 pThunk = &pTask->thunks;
171 base = (int)pThunk - (int)pTask;
172 while (!pThunk->free)
173 {
174 sel = pThunk->next;
175 if (!sel) /* Allocate a new segment */
176 {
177 sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
178 pTask->hPDB, TRUE, FALSE, FALSE );
179 if (!sel) return (SEGPTR)0;
180 TASK_CreateThunks( sel, 0, MIN_THUNKS );
181 pThunk->next = sel;
182 }
183 pThunk = (THUNKS *)GlobalLock16( sel );
184 base = 0;
185 }
186 base += pThunk->free;
187 pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
188 return PTR_SEG_OFF_TO_SEGPTR( sel, base );
189 }
190
191
192 /***********************************************************************
193 * TASK_FreeThunk
194 *
195 * Free a MakeProcInstance() thunk.
196 */
197 static BOOL32 TASK_FreeThunk( HTASK16 hTask, SEGPTR thunk )
198 {
199 TDB *pTask;
200 THUNKS *pThunk;
201 WORD sel, base;
202
203 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
204 sel = pTask->hCSAlias;
205 pThunk = &pTask->thunks;
206 base = (int)pThunk - (int)pTask;
207 while (sel && (sel != HIWORD(thunk)))
208 {
209 sel = pThunk->next;
210 pThunk = (THUNKS *)GlobalLock16( sel );
211 base = 0;
212 }
213 if (!sel) return FALSE;
214 *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
215 pThunk->free = LOWORD(thunk) - base;
216 return TRUE;
217 }
218
219
220 /***********************************************************************
221 * TASK_CallToStart
222 *
223 * 32-bit entry point for a new task. This function is responsible for
224 * setting up the registers and jumping to the 16-bit entry point.
225 */
226 static void TASK_CallToStart(void)
227 {
228 TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
229 NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
230 SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
231
232 SET_CUR_THREAD( pTask->thdb );
233 CLIENT_InitThread();
234
235 /* Terminate the stack frame chain */
236 memset(THREAD_STACK16( pTask->thdb ), '\0', sizeof(STACK16FRAME));
237
238 if (pModule->flags & NE_FFLAGS_WIN32)
239 {
240 /* FIXME: all this is an ugly hack */
241
242 LPTHREAD_START_ROUTINE entry = (LPTHREAD_START_ROUTINE)
243 RVA_PTR(pModule->module32, OptionalHeader.AddressOfEntryPoint);
244 DWORD size = PE_HEADER(pModule->module32)->OptionalHeader.SizeOfStackReserve;
245 DWORD id;
246 THDB *thdb;
247
248 pTask->userhandler = (USERSIGNALPROC)&USER_SignalProc;
249 if (pModule->heap_size)
250 LocalInit( pTask->hInstance, 0, pModule->heap_size );
251
252 InitApp( pTask->hModule );
253 MODULE_InitializeDLLs( PROCESS_Current(), 0, DLL_PROCESS_ATTACH, (LPVOID)-1 );
254 TRACE(relay, "(entryproc=%p)\n", entry );
255
256 #if 1
257 ExitProcess( entry(NULL) );
258 #else
259 CreateThread( NULL, size, entry, NULL, 0, &id );
260 thdb = THREAD_ID_TO_THDB( id );
261
262 while ( thdb->exit_code == 0x103 )
263 {
264 WaitEvent( 0 );
265 QUEUE_Signal( pTask->hSelf );
266 }
267
268 ExitProcess( thdb->exit_code );
269 #endif
270 }
271 else if (pModule->dos_image)
272 {
273 DOSVM_Enter( NULL );
274 ExitProcess( 0 );
275 }
276 else
277 {
278 /* Registers at initialization must be:
279 * ax zero
280 * bx stack size in bytes
281 * cx heap size in bytes
282 * si previous app instance
283 * di current app instance
284 * bp zero
285 * es selector to the PSP
286 * ds dgroup of the application
287 * ss stack selector
288 * sp top of the stack
289 */
290 CONTEXT context;
291
292 memset( &context, 0, sizeof(context) );
293 CS_reg(&context) = GlobalHandleToSel(pSegTable[pModule->cs - 1].hSeg);
294 DS_reg(&context) = GlobalHandleToSel(pSegTable[pModule->dgroup - 1].hSeg);
295 ES_reg(&context) = pTask->hPDB;
296 EIP_reg(&context) = pModule->ip;
297 EBX_reg(&context) = pModule->stack_size;
298 ECX_reg(&context) = pModule->heap_size;
299 EDI_reg(&context) = context.SegDs;
300
301 TRACE(task, "Starting main program: cs:ip=%04lx:%04x ds=%04lx ss:sp=%04x:%04x\n",
302 CS_reg(&context), IP_reg(&context), DS_reg(&context),
303 SELECTOROF(pTask->thdb->cur_stack),
304 OFFSETOF(pTask->thdb->cur_stack) );
305
306 Callbacks->CallRegisterShortProc( &context, 0 );
307 /* This should never return */
308 ERR( task, "Main program returned! (should never happen)\n" );
309 ExitProcess( 1 );
310 }
311 }
312
313
314 /***********************************************************************
315 * TASK_Create
316 *
317 * NOTE: This routine might be called by a Win32 thread. We don't have
318 * any real problems with that, since we operated merely on a private
319 * TDB structure that is not yet linked into the task list.
320 */
321 HTASK16 TASK_Create( THDB *thdb, NE_MODULE *pModule, HINSTANCE16 hInstance,
322 HINSTANCE16 hPrevInstance, UINT16 cmdShow)
323 {
324 HTASK16 hTask;
325 TDB *pTask;
326 LPSTR cmd_line;
327 WORD sp;
328 char *stack32Top;
329 char name[10];
330 STACK16FRAME *frame16;
331 STACK32FRAME *frame32;
332 PDB32 *pdb32 = thdb->process;
333 SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
334
335 /* Allocate the task structure */
336
337 hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB),
338 pModule->self, FALSE, FALSE, FALSE );
339 if (!hTask) return 0;
340 pTask = (TDB *)GlobalLock16( hTask );
341
342 /* Fill the task structure */
343
344 pTask->nEvents = 1; /* So the task can be started */
345 pTask->hSelf = hTask;
346 pTask->flags = 0;
347
348 if (pModule->flags & NE_FFLAGS_WIN32)
349 pTask->flags |= TDBF_WIN32;
350 if (pModule->lpDosTask)
351 pTask->flags |= TDBF_WINOLDAP;
352
353 pTask->version = pModule->expected_version;
354 pTask->hInstance = hInstance;
355 pTask->hPrevInstance = hPrevInstance;
356 pTask->hModule = pModule->self;
357 pTask->hParent = GetCurrentTask();
358 pTask->magic = TDB_MAGIC;
359 pTask->nCmdShow = cmdShow;
360 pTask->thdb = thdb;
361 pTask->curdrive = DRIVE_GetCurrentDrive() | 0x80;
362 strcpy( pTask->curdir, "\\" );
363 lstrcpyn32A( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
364 sizeof(pTask->curdir) - 1 );
365
366 /* Create the thunks block */
367
368 TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
369
370 /* Copy the module name */
371
372 GetModuleName( pModule->self, name, sizeof(name) );
373 strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
374
375 /* Allocate a selector for the PDB */
376
377 pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB),
378 pModule->self, FALSE, FALSE, FALSE, NULL );
379
380 /* Fill the PDB */
381
382 pTask->pdb.int20 = 0x20cd;
383 pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */
384 PUT_DWORD(&pTask->pdb.dispatcher[1], (DWORD)NE_GetEntryPoint(
385 GetModuleHandle16("KERNEL"), 102 )); /* KERNEL.102 is DOS3Call() */
386 pTask->pdb.savedint22 = INT_GetPMHandler( 0x22 );
387 pTask->pdb.savedint23 = INT_GetPMHandler( 0x23 );
388 pTask->pdb.savedint24 = INT_GetPMHandler( 0x24 );
389 pTask->pdb.fileHandlesPtr =
390 PTR_SEG_OFF_TO_SEGPTR( GlobalHandleToSel(pTask->hPDB),
391 (int)&((PDB *)0)->fileHandles );
392 pTask->pdb.hFileHandles = 0;
393 memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
394 pTask->pdb.environment = pdb32->env_db->env_sel;
395 pTask->pdb.nbFiles = 20;
396
397 /* Fill the command line */
398
399 cmd_line = pdb32->env_db->cmd_line;
400 while (*cmd_line && (*cmd_line != ' ') && (*cmd_line != '\t')) cmd_line++;
401 while ((*cmd_line == ' ') || (*cmd_line == '\t')) cmd_line++;
402 lstrcpyn32A( pTask->pdb.cmdLine+1, cmd_line, sizeof(pTask->pdb.cmdLine)-1);
403 pTask->pdb.cmdLine[0] = strlen( pTask->pdb.cmdLine + 1 );
404
405 /* Get the compatibility flags */
406
407 pTask->compat_flags = GetProfileInt32A( "Compatibility", name, 0 );
408
409 /* Allocate a code segment alias for the TDB */
410
411 pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
412 sizeof(TDB), pTask->hPDB, TRUE,
413 FALSE, FALSE, NULL );
414
415 /* Set the owner of the environment block */
416
417 FarSetOwner( pTask->pdb.environment, pTask->hPDB );
418
419 /* Default DTA overwrites command-line */
420
421 pTask->dta = PTR_SEG_OFF_TO_SEGPTR( pTask->hPDB,
422 (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
423
424 /* Create the 16-bit stack frame */
425
426 if (!(sp = pModule->sp))
427 sp = pSegTable[pModule->ss-1].minsize + pModule->stack_size;
428 sp &= ~1; sp -= 2*sizeof(STACK16FRAME);
429 pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( pTask->hInstance, sp );
430 frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
431 frame16->ebp = sp + (int)&((STACK16FRAME *)0)->bp;
432 frame16->bp = LOWORD(frame16->ebp);
433 frame16->ds = frame16->es = pTask->hInstance;
434 frame16->fs = 0;
435 frame16->entry_point = 0;
436 frame16->entry_cs = 0;
437 frame16->mutex_count = 1; /* TASK_Reschedule is called from 16-bit code */
438 /* The remaining fields will be initialized in TASK_Reschedule */
439
440 /* Create the 32-bit stack frame */
441
442 stack32Top = (char*)pTask->thdb->teb.stack_top;
443 frame16->frame32 = frame32 = (STACK32FRAME *)stack32Top - 1;
444 frame32->frame16 = pTask->thdb->cur_stack + sizeof(STACK16FRAME);
445 frame32->edi = 0;
446 frame32->esi = 0;
447 frame32->edx = 0;
448 frame32->ecx = 0;
449 frame32->ebx = 0;
450 frame32->retaddr = (DWORD)TASK_CallToStart;
451 /* The remaining fields will be initialized in TASK_Reschedule */
452
453
454 TRACE(task, "module='%s' cmdline='%s' task=%04x\n",
455 name, cmd_line, hTask );
456
457 return hTask;
458 }
459
460 /***********************************************************************
461 * TASK_StartTask
462 *
463 * NOTE: This routine might be called by a Win32 thread. Thus, we need
464 * to be careful to protect global data structures. We do this
465 * by entering the Win16Lock while linking the task into the
466 * global task list.
467 */
468 void TASK_StartTask( HTASK16 hTask )
469 {
470 /* Add the task to the linked list */
471
472 SYSLEVEL_EnterWin16Lock();
473 TASK_LinkTask( hTask );
474 SYSLEVEL_LeaveWin16Lock();
475
476 TRACE(task, "linked task %04x\n", hTask );
477
478 /* Get the task up and running. If we ourselves are a 16-bit task,
479 we simply Yield(). If we are 32-bit however, we need to signal
480 the main process somehow (NOT YET IMPLEMENTED!) */
481
482 if ( THREAD_IsWin16( THREAD_Current() ) )
483 OldYield();
484 else
485 FIXME(task, "Don't know how to start 16-bit task from 32-bit thread. Move the mouse!\n");
486 }
487
488
489 /***********************************************************************
490 * TASK_DeleteTask
491 */
492 static void TASK_DeleteTask( HTASK16 hTask )
493 {
494 TDB *pTask;
495 HGLOBAL16 hPDB;
496
497 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
498 hPDB = pTask->hPDB;
499
500 pTask->magic = 0xdead; /* invalidate signature */
501
502 /* Delete the Win32 part of the task */
503
504 K32OBJ_DecCount( &pTask->thdb->process->header );
505 K32OBJ_DecCount( &pTask->thdb->header );
506
507 /* Free the task module */
508
509 FreeModule16( pTask->hModule );
510
511 /* Free the selector aliases */
512
513 GLOBAL_FreeBlock( pTask->hCSAlias );
514 GLOBAL_FreeBlock( pTask->hPDB );
515
516 /* Free the task structure itself */
517
518 GlobalFree16( hTask );
519
520 /* Free all memory used by this task (including the 32-bit stack, */
521 /* the environment block and the thunk segments). */
522
523 GlobalFreeAll( hPDB );
524 }
525
526
527 /***********************************************************************
528 * TASK_KillCurrentTask
529 *
530 * Kill the currently running task. As it's not possible to kill the
531 * current task like this, it is simply marked for destruction, and will
532 * be killed when either TASK_Reschedule or this function is called again
533 * in the context of another task.
534 */
535 void TASK_KillCurrentTask( INT16 exitCode )
536 {
537 TDB* pTask = (TDB*) GlobalLock16( GetCurrentTask() );
538 NE_MODULE* pModule = NE_GetPtr( pTask->hModule );
539 if (!pTask) USER_ExitWindows(); /* No current task yet */
540
541 if ( !THREAD_IsWin16( THREAD_Current() ) )
542 {
543 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
544 return;
545 }
546
547 /* Enter the Win16Lock to protect global data structures
548 NOTE: We never explicitly leave it again. This shouldn't matter
549 though, as it will be released in TASK_Reschedule and this
550 task won't ever get scheduled again ... */
551
552 SYSLEVEL_EnterWin16Lock();
553
554 assert(hCurrentTask == GetCurrentTask());
555
556 TRACE(task, "Killing task %04x\n", hCurrentTask );
557
558 /* Delete active sockets */
559
560 if( pTask->pwsi )
561 WINSOCK_DeleteTaskWSI( pTask, pTask->pwsi );
562
563 #ifdef MZ_SUPPORTED
564 /* Kill DOS VM task */
565 if ( pModule->lpDosTask )
566 MZ_KillModule( pModule->lpDosTask );
567 #endif
568
569 /* Perform USER cleanup */
570
571 if (pTask->userhandler)
572 pTask->userhandler( hCurrentTask, USIG_TERMINATION, 0,
573 pTask->hInstance, pTask->hQueue );
574
575 if (hTaskToKill && (hTaskToKill != hCurrentTask))
576 {
577 /* If another task is already marked for destruction, */
578 /* we can kill it now, as we are in another context. */
579 TASK_DeleteTask( hTaskToKill );
580 }
581
582 if (nTaskCount <= 2) /* FIXME */
583 {
584 TRACE(task, "this is the last task, exiting\n" );
585 USER_ExitWindows();
586 }
587
588 /* Remove the task from the list to be sure we never switch back to it */
589 TASK_UnlinkTask( hCurrentTask );
590 if( nTaskCount )
591 {
592 TDB* p = (TDB *)GlobalLock16( hFirstTask );
593 while( p )
594 {
595 if( p->hYieldTo == hCurrentTask ) p->hYieldTo = 0;
596 p = (TDB *)GlobalLock16( p->hNext );
597 }
598 }
599
600 hTaskToKill = hCurrentTask;
601 hLockedTask = 0;
602
603 pTask->nEvents = 0;
604 TASK_YieldToSystem(pTask);
605
606 /* We should never return from this Yield() */
607
608 ERR(task,"Return of the living dead %04x!!!\n", hCurrentTask);
609 exit(1);
610 }
611
612 /***********************************************************************
613 * TASK_Reschedule
614 *
615 * This is where all the magic of task-switching happens!
616 *
617 * Note: This function should only be called via the TASK_YieldToSystem()
618 * wrapper, to make sure that all the context is saved correctly.
619 *
620 * It must not call functions that may yield control.
621 */
622 void TASK_Reschedule(void)
623 {
624 TDB *pOldTask = NULL, *pNewTask;
625 HTASK16 hTask = 0;
626 STACK16FRAME *newframe16;
627
628 /* Get the initial task up and running */
629 if (!hCurrentTask && GetCurrentTask())
630 {
631 /* We need to remove one pair of stackframes (exept for Winelib) */
632 STACK16FRAME *oldframe16 = CURRENT_STACK16;
633 STACK32FRAME *oldframe32 = oldframe16->frame32;
634 STACK16FRAME *newframe16 = PTR_SEG_TO_LIN( oldframe32->frame16 );
635 STACK32FRAME *newframe32 = newframe16->frame32;
636 if (newframe32)
637 {
638 newframe16->entry_ip = oldframe16->entry_ip;
639 newframe16->entry_cs = oldframe16->entry_cs;
640 newframe16->ip = oldframe16->ip;
641 newframe16->cs = oldframe16->cs;
642 newframe32->ebp = oldframe32->ebp;
643 newframe32->restore_addr = oldframe32->restore_addr;
644 newframe32->codeselector = oldframe32->codeselector;
645
646 THREAD_Current()->cur_stack = oldframe32->frame16;
647 }
648
649 hCurrentTask = GetCurrentTask();
650 pNewTask = (TDB *)GlobalLock16( hCurrentTask );
651 pNewTask->ss_sp = pNewTask->thdb->cur_stack;
652 return;
653 }
654
655 /* NOTE: As we are entered from 16-bit code, we hold the Win16Lock.
656 We hang onto it thoughout most of this routine, so that accesses
657 to global variables (most notably the task list) are protected. */
658 assert(hCurrentTask == GetCurrentTask());
659
660 TRACE(task, "entered with hTask %04x (pid %d)\n", hCurrentTask, getpid());
661
662 #ifdef CONFIG_IPC
663 /* FIXME: What about the Win16Lock ??? */
664 dde_reschedule();
665 #endif
666 /* First check if there's a task to kill */
667
668 if (hTaskToKill && (hTaskToKill != hCurrentTask))
669 {
670 TASK_DeleteTask( hTaskToKill );
671 hTaskToKill = 0;
672 }
673
674 /* Find a task to yield to */
675
676 pOldTask = (TDB *)GlobalLock16( hCurrentTask );
677 if (pOldTask && pOldTask->hYieldTo)
678 {
679 /* check for DirectedYield() */
680
681 hTask = pOldTask->hYieldTo;
682 pNewTask = (TDB *)GlobalLock16( hTask );
683 if( !pNewTask || !pNewTask->nEvents) hTask = 0;
684 pOldTask->hYieldTo = 0;
685 }
686
687 /* extract hardware events only! */
688
689 if (!hTask) EVENT_WaitNetEvent( FALSE, TRUE );
690
691 while (!hTask)
692 {
693 /* Find a task that has an event pending */
694
695 hTask = hFirstTask;
696 while (hTask)
697 {
698 pNewTask = (TDB *)GlobalLock16( hTask );
699
700 TRACE(task, "\ttask = %04x, events = %i\n", hTask, pNewTask->nEvents);
701
702 if (pNewTask->nEvents) break;
703 hTask = pNewTask->hNext;
704 }
705 if (hLockedTask && (hTask != hLockedTask)) hTask = 0;
706 if (hTask) break;
707
708 /* No task found, wait for some events to come in */
709
710 /* NOTE: We release the Win16Lock while waiting for events. This is to enable
711 Win32 threads to thunk down to 16-bit temporarily. Since Win16
712 tasks won't execute and Win32 threads are not allowed to enter
713 TASK_Reschedule anyway, there should be no re-entrancy problem ... */
714
715 SYSLEVEL_ReleaseWin16Lock();
716 EVENT_WaitNetEvent( TRUE, TRUE );
717 SYSLEVEL_RestoreWin16Lock();
718 }
719
720 if (hTask == hCurrentTask)
721 {
722 TRACE(task, "returning to the current task(%04x)\n", hTask );
723 return; /* Nothing to do */
724 }
725 pNewTask = (TDB *)GlobalLock16( hTask );
726 TRACE(task, "Switching to task %04x (%.8s)\n",
727 hTask, pNewTask->module_name );
728
729 /* Make the task the last in the linked list (round-robin scheduling) */
730
731 pNewTask->priority++;
732 TASK_UnlinkTask( hTask );
733 TASK_LinkTask( hTask );
734 pNewTask->priority--;
735
736 /* Finish initializing the new task stack if necessary */
737
738 newframe16 = THREAD_STACK16( pNewTask->thdb );
739 if (!newframe16->entry_cs)
740 {
741 STACK16FRAME *oldframe16 = CURRENT_STACK16;
742 STACK32FRAME *oldframe32 = oldframe16->frame32;
743 STACK32FRAME *newframe32 = newframe16->frame32;
744 newframe16->entry_ip = oldframe16->entry_ip;
745 newframe16->entry_cs = oldframe16->entry_cs;
746 newframe16->ip = oldframe16->ip;
747 newframe16->cs = oldframe16->cs;
748 newframe32->ebp = oldframe32->ebp;
749 newframe32->restore_addr = oldframe32->restore_addr;
750 newframe32->codeselector = oldframe32->codeselector;
751 }
752
753 /* Switch to the new stack */
754
755 /* NOTE: We need to release/restore the Win16Lock, as the task
756 switched to might be at another recursion level than
757 the old task ... */
758
759 SYSLEVEL_ReleaseWin16Lock();
760
761 hCurrentTask = hTask;
762 SET_CUR_THREAD( pNewTask->thdb );
763 pNewTask->ss_sp = pNewTask->thdb->cur_stack;
764
765 SYSLEVEL_RestoreWin16Lock();
766 }
767
768
769 /***********************************************************************
770 * TASK_YieldToSystem
771 *
772 * Scheduler interface, this way we ensure that all "unsafe" events are
773 * processed outside the scheduler.
774 */
775 void TASK_YieldToSystem(TDB* pTask)
776 {
777 MESSAGEQUEUE* pQ;
778
779 if ( !THREAD_IsWin16( THREAD_Current() ) )
780 {
781 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
782 return;
783 }
784
785 Callbacks->CallTaskRescheduleProc();
786
787 if( pTask )
788 {
789 pQ = (MESSAGEQUEUE*)GlobalLock16(pTask->hQueue);
790 if( pQ && pQ->flags & QUEUE_FLAG_XEVENT &&
791 !(pQ->wakeBits & (QS_SENDMESSAGE | QS_SMRESULT)) )
792 {
793 pQ->flags &= ~QUEUE_FLAG_XEVENT;
794 EVENT_WaitNetEvent( FALSE, FALSE );
795 }
796 }
797 }
798
799
800 /***********************************************************************
801 * InitTask (KERNEL.91)
802 *
803 * Called by the application startup code.
804 */
805 void WINAPI InitTask( CONTEXT *context )
806 {
807 TDB *pTask;
808 NE_MODULE *pModule;
809 SEGTABLEENTRY *pSegTable;
810 INSTANCEDATA *pinstance;
811 LONG stacklow, stackhi;
812
813 if (context) EAX_reg(context) = 0;
814 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
815 if (!(pModule = NE_GetPtr( pTask->hModule ))) return;
816
817 /* This is a hack to install task USER signal handler before
818 * implicitly loaded DLLs are initialized (see windows/user.c) */
819
820 pTask->userhandler = (USERSIGNALPROC)&USER_SignalProc;
821
822 /* Initialize implicitly loaded DLLs */
823 NE_InitializeDLLs( pTask->hModule );
824
825 if (context)
826 {
827 /* Registers on return are:
828 * ax 1 if OK, 0 on error
829 * cx stack limit in bytes
830 * dx cmdShow parameter
831 * si instance handle of the previous instance
832 * di instance handle of the new task
833 * es:bx pointer to command-line inside PSP
834 *
835 * 0 (=%bp) is pushed on the stack
836 */
837 SEGPTR ptr = STACK16_PUSH( pTask->thdb, sizeof(WORD) );
838 *(WORD *)PTR_SEG_TO_LIN(ptr) = 0;
839 SP_reg(context) -= 2;
840
841 EAX_reg(context) = 1;
842
843 if (!pTask->pdb.cmdLine[0]) EBX_reg(context) = 0x80;
844 else
845 {
846 LPBYTE p = &pTask->pdb.cmdLine[1];
847 while ((*p == ' ') || (*p == '\t')) p++;
848 EBX_reg(context) = 0x80 + (p - pTask->pdb.cmdLine);
849 }
850 ECX_reg(context) = pModule->stack_size;
851 EDX_reg(context) = pTask->nCmdShow;
852 ESI_reg(context) = (DWORD)pTask->hPrevInstance;
853 EDI_reg(context) = (DWORD)pTask->hInstance;
854 ES_reg (context) = (WORD)pTask->hPDB;
855 }
856
857 /* Initialize the local heap */
858 if ( pModule->heap_size )
859 {
860 LocalInit( pTask->hInstance, 0, pModule->heap_size );
861 }
862
863 /* Initialize the INSTANCEDATA structure */
864 pSegTable = NE_SEG_TABLE( pModule );
865 stacklow = pSegTable[pModule->ss - 1].minsize;
866 stackhi = stacklow + pModule->stack_size;
867 if (stackhi > 0xffff) stackhi = 0xffff;
868 pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0);
869 pinstance->stackbottom = stackhi; /* yup, that's right. Confused me too. */
870 pinstance->stacktop = stacklow;
871 pinstance->stackmin = OFFSETOF( pTask->thdb->cur_stack );
872 }
873
874
875 /***********************************************************************
876 * WaitEvent (KERNEL.30)
877 */
878 BOOL16 WINAPI WaitEvent( HTASK16 hTask )
879 {
880 TDB *pTask;
881
882 if (!hTask) hTask = GetCurrentTask();
883 pTask = (TDB *)GlobalLock16( hTask );
884
885 if ( !THREAD_IsWin16( THREAD_Current() ) )
886 {
887 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
888 return TRUE;
889 }
890
891 if (pTask->nEvents > 0)
892 {
893 pTask->nEvents--;
894 return FALSE;
895 }
896 TASK_YieldToSystem(pTask);
897
898 /* When we get back here, we have an event */
899
900 if (pTask->nEvents > 0) pTask->nEvents--;
901 return TRUE;
902 }
903
904
905 /***********************************************************************
906 * PostEvent (KERNEL.31)
907 */
908 void WINAPI PostEvent( HTASK16 hTask )
909 {
910 TDB *pTask;
911
912 if (!hTask) hTask = GetCurrentTask();
913 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
914
915 if ( !THREAD_IsWin16( THREAD_Current() ) )
916 {
917 WARN(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
918 /* return; */
919 }
920
921 pTask->nEvents++;
922 }
923
924
925 /***********************************************************************
926 * SetPriority (KERNEL.32)
927 */
928 void WINAPI SetPriority( HTASK16 hTask, INT16 delta )
929 {
930 TDB *pTask;
931 INT16 newpriority;
932
933 if (!hTask) hTask = GetCurrentTask();
934 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
935 newpriority = pTask->priority + delta;
936 if (newpriority < -32) newpriority = -32;
937 else if (newpriority > 15) newpriority = 15;
938
939 pTask->priority = newpriority + 1;
940 TASK_UnlinkTask( hTask );
941 TASK_LinkTask( hTask );
942 pTask->priority--;
943 }
944
945
946 /***********************************************************************
947 * LockCurrentTask (KERNEL.33)
948 */
949 HTASK16 WINAPI LockCurrentTask( BOOL16 bLock )
950 {
951 if (bLock) hLockedTask = GetCurrentTask();
952 else hLockedTask = 0;
953 return hLockedTask;
954 }
955
956
957 /***********************************************************************
958 * IsTaskLocked (KERNEL.122)
959 */
960 HTASK16 WINAPI IsTaskLocked(void)
961 {
962 return hLockedTask;
963 }
964
965
966 /***********************************************************************
967 * OldYield (KERNEL.117)
968 */
969 void WINAPI OldYield(void)
970 {
971 TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
972
973 if ( !THREAD_IsWin16( THREAD_Current() ) )
974 {
975 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
976 return;
977 }
978
979 if (pCurTask) pCurTask->nEvents++; /* Make sure we get back here */
980 TASK_YieldToSystem(pCurTask);
981 if (pCurTask) pCurTask->nEvents--;
982 }
983
984
985 /***********************************************************************
986 * DirectedYield (KERNEL.150)
987 */
988 void WINAPI DirectedYield( HTASK16 hTask )
989 {
990 TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
991
992 if ( !THREAD_IsWin16( THREAD_Current() ) )
993 {
994 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
995 return;
996 }
997
998 TRACE(task, "%04x: DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
999
1000 pCurTask->hYieldTo = hTask;
1001 OldYield();
1002
1003 TRACE(task, "%04x: back from DirectedYield(%04x)\n", pCurTask->hSelf, hTask );
1004 }
1005
1006
1007 /***********************************************************************
1008 * UserYield (USER.332)
1009 */
1010 void WINAPI UserYield(void)
1011 {
1012 TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
1013 MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
1014
1015 if ( !THREAD_IsWin16( THREAD_Current() ) )
1016 {
1017 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
1018 return;
1019 }
1020
1021 /* Handle sent messages */
1022 while (queue && (queue->wakeBits & QS_SENDMESSAGE))
1023 QUEUE_ReceiveMessage( queue );
1024
1025 OldYield();
1026
1027 queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
1028 while (queue && (queue->wakeBits & QS_SENDMESSAGE))
1029 QUEUE_ReceiveMessage( queue );
1030 }
1031
1032
1033 /***********************************************************************
1034 * Yield16 (KERNEL.29)
1035 */
1036 void WINAPI Yield16(void)
1037 {
1038 TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
1039
1040 if ( !THREAD_IsWin16( THREAD_Current() ) )
1041 {
1042 FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
1043 return;
1044 }
1045
1046 if (pCurTask) pCurTask->hYieldTo = 0;
1047 if (pCurTask && pCurTask->hQueue) UserYield();
1048 else OldYield();
1049 }
1050
1051
1052 /***********************************************************************
1053 * MakeProcInstance16 (KERNEL.51)
1054 */
1055 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
1056 {
1057 BYTE *thunk,*lfunc;
1058 SEGPTR thunkaddr;
1059
1060 if (!func) {
1061 ERR(task, "Ouch ! MakeProcInstance called with func == NULL !\n");
1062 return (FARPROC16)0; /* Windows seems to do the same */
1063 }
1064 if (!hInstance) hInstance = CURRENT_DS;
1065 thunkaddr = TASK_AllocThunk( GetCurrentTask() );
1066 if (!thunkaddr) return (FARPROC16)0;
1067 thunk = PTR_SEG_TO_LIN( thunkaddr );
1068 lfunc = PTR_SEG_TO_LIN( func );
1069
1070 TRACE(task, "(%08lx,%04x): got thunk %08lx\n",
1071 (DWORD)func, hInstance, (DWORD)thunkaddr );
1072 if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) ||
1073 ((lfunc[0]==0x1e) && (lfunc[1]==0x58))
1074 ) {
1075 FIXME(task,"thunk would be useless for %p, overwriting with nop;nop;\n", func );
1076 lfunc[0]=0x90; /* nop */
1077 lfunc[1]=0x90; /* nop */
1078 }
1079
1080 *thunk++ = 0xb8; /* movw instance, %ax */
1081 *thunk++ = (BYTE)(hInstance & 0xff);
1082 *thunk++ = (BYTE)(hInstance >> 8);
1083 *thunk++ = 0xea; /* ljmp func */
1084 *(DWORD *)thunk = (DWORD)func;
1085 return (FARPROC16)thunkaddr;
1086 }
1087
1088
1089 /***********************************************************************
1090 * FreeProcInstance16 (KERNEL.52)
1091 */
1092 void WINAPI FreeProcInstance16( FARPROC16 func )
1093 {
1094 TRACE(task, "(%08lx)\n", (DWORD)func );
1095 TASK_FreeThunk( GetCurrentTask(), (SEGPTR)func );
1096 }
1097
1098
1099 /**********************************************************************
1100 * GetCodeHandle (KERNEL.93)
1101 */
1102 HANDLE16 WINAPI GetCodeHandle( FARPROC16 proc )
1103 {
1104 HANDLE16 handle;
1105 BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
1106
1107 /* Return the code segment containing 'proc'. */
1108 /* Not sure if this is really correct (shouldn't matter that much). */
1109
1110 /* Check if it is really a thunk */
1111 if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
1112 handle = GlobalHandle16( thunk[6] + (thunk[7] << 8) );
1113 else
1114 handle = GlobalHandle16( HIWORD(proc) );
1115
1116 return handle;
1117 }
1118
1119 /**********************************************************************
1120 * GetCodeInfo (KERNEL.104)
1121 */
1122 VOID WINAPI GetCodeInfo( FARPROC16 proc, SEGINFO *segInfo )
1123 {
1124 BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
1125 NE_MODULE *pModule = NULL;
1126 SEGTABLEENTRY *pSeg = NULL;
1127 WORD segNr;
1128
1129 /* proc is either a thunk, or else a pair of module handle
1130 and segment number. In the first case, we also need to
1131 extract module and segment number. */
1132
1133 if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
1134 {
1135 WORD selector = thunk[6] + (thunk[7] << 8);
1136 pModule = NE_GetPtr( GlobalHandle16( selector ) );
1137 pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
1138
1139 if ( pModule )
1140 for ( segNr = 0; segNr < pModule->seg_count; segNr++, pSeg++ )
1141 if ( GlobalHandleToSel(pSeg->hSeg) == selector )
1142 break;
1143
1144 if ( pModule && segNr >= pModule->seg_count )
1145 pSeg = NULL;
1146 }
1147 else
1148 {
1149 pModule = NE_GetPtr( HIWORD( proc ) );
1150 segNr = LOWORD( proc );
1151
1152 if ( pModule && segNr < pModule->seg_count )
1153 pSeg = NE_SEG_TABLE( pModule ) + segNr;
1154 }
1155
1156 /* fill in segment information */
1157
1158 segInfo->offSegment = pSeg? pSeg->filepos : 0;
1159 segInfo->cbSegment = pSeg? pSeg->size : 0;
1160 segInfo->flags = pSeg? pSeg->flags : 0;
1161 segInfo->cbAlloc = pSeg? pSeg->minsize : 0;
1162 segInfo->h = pSeg? pSeg->hSeg : 0;
1163 segInfo->alignShift = pModule? pModule->alignment : 0;
1164 }
1165
1166
1167 /**********************************************************************
1168 * DefineHandleTable16 (KERNEL.94)
1169 */
1170 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1171 {
1172 return TRUE; /* FIXME */
1173 }
1174
1175
1176 /***********************************************************************
1177 * SetTaskQueue (KERNEL.34)
1178 */
1179 HQUEUE16 WINAPI SetTaskQueue( HTASK16 hTask, HQUEUE16 hQueue )
1180 {
1181 HQUEUE16 hPrev;
1182 TDB *pTask;
1183
1184 if (!hTask) hTask = GetCurrentTask();
1185 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1186
1187 hPrev = pTask->hQueue;
1188 pTask->hQueue = hQueue;
1189
1190 TIMER_SwitchQueue( hPrev, hQueue );
1191
1192 return hPrev;
1193 }
1194
1195
1196 /***********************************************************************
1197 * GetTaskQueue (KERNEL.35)
1198 */
1199 HQUEUE16 WINAPI GetTaskQueue( HTASK16 hTask )
1200 {
1201 TDB *pTask;
1202
1203 if (!hTask) hTask = GetCurrentTask();
1204 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1205 return pTask->hQueue;
1206 }
1207
1208 /***********************************************************************
1209 * SetThreadQueue (KERNEL.463)
1210 */
1211 HQUEUE16 WINAPI SetThreadQueue( DWORD thread, HQUEUE16 hQueue )
1212 {
1213 THDB *thdb = THREAD_IdToTHDB( thread );
1214 HQUEUE16 oldQueue = thdb? thdb->teb.queue : 0;
1215
1216 if ( thdb )
1217 {
1218 thdb->teb.queue = hQueue;
1219
1220 if ( GetTaskQueue( thdb->process->task ) == oldQueue )
1221 SetTaskQueue( thdb->process->task, hQueue );
1222 }
1223
1224 return oldQueue;
1225 }
1226
1227 /***********************************************************************
1228 * GetThreadQueue (KERNEL.464)
1229 */
1230 HQUEUE16 WINAPI GetThreadQueue( DWORD thread )
1231 {
1232 THDB *thdb = THREAD_IdToTHDB( thread );
1233 return (HQUEUE16)(thdb? thdb->teb.queue : 0);
1234 }
1235
1236 /***********************************************************************
1237 * SetFastQueue (KERNEL.624)
1238 */
1239 VOID WINAPI SetFastQueue( DWORD thread, HANDLE32 hQueue )
1240 {
1241 THDB *thdb = THREAD_IdToTHDB( thread );
1242 if ( thdb ) thdb->teb.queue = (HQUEUE16) hQueue;
1243 }
1244
1245 /***********************************************************************
1246 * GetFastQueue (KERNEL.625)
1247 */
1248 HANDLE32 WINAPI GetFastQueue( void )
1249 {
1250 THDB *thdb = THREAD_Current();
1251 if (!thdb) return 0;
1252
1253 if (!(thdb->teb.queue))
1254 {
1255 HMODULE16 hModule = GetModuleHandle16( "USER" );
1256 FARPROC16 proc = WIN32_GetProcAddress16( hModule, "InitThreadInput" );
1257 Callbacks->CallBootAppProc( proc, 0, 4 ); /* FIXME! */
1258 }
1259
1260 if (!(thdb->teb.queue))
1261 FIXME( task, "(): should initialize thread-local queue, expect failure!\n" );
1262
1263 return (HANDLE32)thdb->teb.queue;
1264 }
1265
1266 /***********************************************************************
1267 * SwitchStackTo (KERNEL.108)
1268 */
1269 void WINAPI SwitchStackTo( WORD seg, WORD ptr, WORD top )
1270 {
1271 TDB *pTask;
1272 STACK16FRAME *oldFrame, *newFrame;
1273 INSTANCEDATA *pData;
1274 UINT16 copySize;
1275
1276 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1277 if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1278 TRACE(task, "old=%04x:%04x new=%04x:%04x\n",
1279 SELECTOROF( pTask->thdb->cur_stack ),
1280 OFFSETOF( pTask->thdb->cur_stack ), seg, ptr );
1281
1282 /* Save the old stack */
1283
1284 oldFrame = THREAD_STACK16( pTask->thdb );
1285 /* pop frame + args and push bp */
1286 pData->old_ss_sp = pTask->thdb->cur_stack + sizeof(STACK16FRAME)
1287 + 2 * sizeof(WORD);
1288 *(WORD *)PTR_SEG_TO_LIN(pData->old_ss_sp) = oldFrame->bp;
1289 pData->stacktop = top;
1290 pData->stackmin = ptr;
1291 pData->stackbottom = ptr;
1292
1293 /* Switch to the new stack */
1294
1295 /* Note: we need to take the 3 arguments into account; otherwise,
1296 * the stack will underflow upon return from this function.
1297 */
1298 copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1299 copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1300 pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( seg, ptr - copySize );
1301 newFrame = THREAD_STACK16( pTask->thdb );
1302
1303 /* Copy the stack frame and the local variables to the new stack */
1304
1305 memmove( newFrame, oldFrame, copySize );
1306 newFrame->bp = ptr;
1307 *(WORD *)PTR_SEG_OFF_TO_LIN( seg, ptr ) = 0; /* clear previous bp */
1308 }
1309
1310
1311 /***********************************************************************
1312 * SwitchStackBack (KERNEL.109)
1313 */
1314 void WINAPI SwitchStackBack( CONTEXT *context )
1315 {
1316 TDB *pTask;
1317 STACK16FRAME *oldFrame, *newFrame;
1318 INSTANCEDATA *pData;
1319
1320 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1321 if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(pTask->thdb->cur_stack))))
1322 return;
1323 if (!pData->old_ss_sp)
1324 {
1325 WARN( task, "No previous SwitchStackTo\n" );
1326 return;
1327 }
1328 TRACE(task, "restoring stack %04x:%04x\n",
1329 SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1330
1331 oldFrame = THREAD_STACK16( pTask->thdb );
1332
1333 /* Pop bp from the previous stack */
1334
1335 BP_reg(context) = *(WORD *)PTR_SEG_TO_LIN(pData->old_ss_sp);
1336 pData->old_ss_sp += sizeof(WORD);
1337
1338 /* Switch back to the old stack */
1339
1340 pTask->thdb->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1341 SS_reg(context) = SELECTOROF(pData->old_ss_sp);
1342 ESP_reg(context) = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1343 pData->old_ss_sp = 0;
1344
1345 /* Build a stack frame for the return */
1346
1347 newFrame = THREAD_STACK16( pTask->thdb );
1348 newFrame->frame32 = oldFrame->frame32;
1349 if (TRACE_ON(relay))
1350 {
1351 newFrame->entry_ip = oldFrame->entry_ip;
1352 newFrame->entry_cs = oldFrame->entry_cs;
1353 }
1354 }
1355
1356
1357 /***********************************************************************
1358 * GetTaskQueueDS (KERNEL.118)
1359 */
1360 void WINAPI GetTaskQueueDS( CONTEXT *context )
1361 {
1362 DS_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
1363 }
1364
1365
1366 /***********************************************************************
1367 * GetTaskQueueES (KERNEL.119)
1368 */
1369 void WINAPI GetTaskQueueES( CONTEXT *context )
1370 {
1371 ES_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
1372 }
1373
1374
1375 /***********************************************************************
1376 * GetCurrentTask (KERNEL.36)
1377 */
1378 HTASK16 WINAPI GetCurrentTask(void)
1379 {
1380 return THREAD_InitDone? PROCESS_Current()->task : 0;
1381 }
1382
1383 DWORD WINAPI WIN16_GetCurrentTask(void)
1384 {
1385 /* This is the version used by relay code; the first task is */
1386 /* returned in the high word of the result */
1387 return MAKELONG( GetCurrentTask(), hFirstTask );
1388 }
1389
1390
1391 /***********************************************************************
1392 * GetCurrentPDB (KERNEL.37)
1393 */
1394 HANDLE16 WINAPI GetCurrentPDB(void)
1395 {
1396 TDB *pTask;
1397
1398 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1399 return pTask->hPDB;
1400 }
1401
1402
1403 /***********************************************************************
1404 * GetInstanceData (KERNEL.54)
1405 */
1406 INT16 WINAPI GetInstanceData( HINSTANCE16 instance, WORD buffer, INT16 len )
1407 {
1408 char *ptr = (char *)GlobalLock16( instance );
1409 if (!ptr || !len) return 0;
1410 if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1411 memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1412 return len;
1413 }
1414
1415
1416 /***********************************************************************
1417 * GetExeVersion (KERNEL.105)
1418 */
1419 WORD WINAPI GetExeVersion(void)
1420 {
1421 TDB *pTask;
1422
1423 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1424 return pTask->version;
1425 }
1426
1427
1428 /***********************************************************************
1429 * SetErrorMode16 (KERNEL.107)
1430 */
1431 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1432 {
1433 TDB *pTask;
1434 UINT16 oldMode;
1435
1436 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1437 oldMode = pTask->error_mode;
1438 pTask->error_mode = mode;
1439 pTask->thdb->process->error_mode = mode;
1440 return oldMode;
1441 }
1442
1443
1444 /***********************************************************************
1445 * SetErrorMode32 (KERNEL32.486)
1446 */
1447 UINT32 WINAPI SetErrorMode32( UINT32 mode )
1448 {
1449 return SetErrorMode16( (UINT16)mode );
1450 }
1451
1452
1453 /***********************************************************************
1454 * GetDOSEnvironment (KERNEL.131)
1455 */
1456 SEGPTR WINAPI GetDOSEnvironment(void)
1457 {
1458 TDB *pTask;
1459
1460 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1461 return PTR_SEG_OFF_TO_SEGPTR( pTask->pdb.environment, 0 );
1462 }
1463
1464
1465 /***********************************************************************
1466 * GetNumTasks (KERNEL.152)
1467 */
1468 UINT16 WINAPI GetNumTasks(void)
1469 {
1470 return nTaskCount;
1471 }
1472
1473
1474 /***********************************************************************
1475 * GetTaskDS (KERNEL.155)
1476 *
1477 * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1478 * I don't think we need to bother with this.
1479 */
1480 HINSTANCE16 WINAPI GetTaskDS(void)
1481 {
1482 TDB *pTask;
1483
1484 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1485 return pTask->hInstance;
1486 }
1487
1488
1489 /***********************************************************************
1490 * IsTask (KERNEL.320)
1491 */
1492 BOOL16 WINAPI IsTask( HTASK16 hTask )
1493 {
1494 TDB *pTask;
1495
1496 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE;
1497 if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1498 return (pTask->magic == TDB_MAGIC);
1499 }
1500
1501
1502 /***********************************************************************
1503 * SetTaskSignalProc (KERNEL.38)
1504 *
1505 * Real 16-bit interface is provided by the THUNK_SetTaskSignalProc.
1506 */
1507 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1508 {
1509 TDB *pTask;
1510 FARPROC16 oldProc;
1511
1512 if (!hTask) hTask = GetCurrentTask();
1513 if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL;
1514 oldProc = (FARPROC16)pTask->userhandler;
1515 pTask->userhandler = (USERSIGNALPROC)proc;
1516 return oldProc;
1517 }
1518
1519
1520 /***********************************************************************
1521 * SetSigHandler (KERNEL.140)
1522 */
1523 WORD WINAPI SetSigHandler( FARPROC16 newhandler, FARPROC16* oldhandler,
1524 UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1525 {
1526 FIXME(task,"(%p,%p,%p,%d,%d), unimplemented.\n",
1527 newhandler,oldhandler,oldmode,newmode,flag );
1528
1529 if (flag != 1) return 0;
1530 if (!newmode) newhandler = NULL; /* Default handler */
1531 if (newmode != 4)
1532 {
1533 TDB *pTask;
1534
1535 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return 0;
1536 if (oldmode) *oldmode = pTask->signal_flags;
1537 pTask->signal_flags = newmode;
1538 if (oldhandler) *oldhandler = pTask->sighandler;
1539 pTask->sighandler = newhandler;
1540 }
1541 return 0;
1542 }
1543
1544
1545 /***********************************************************************
1546 * GlobalNotify (KERNEL.154)
1547 */
1548 VOID WINAPI GlobalNotify( FARPROC16 proc )
1549 {
1550 TDB *pTask;
1551
1552 if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
1553 pTask->discardhandler = proc;
1554 }
1555
1556
1557 /***********************************************************************
1558 * GetExePtr (KERNEL.133)
1559 */
1560 static HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1561 {
1562 char *ptr;
1563 HANDLE16 owner;
1564
1565 /* Check for module handle */
1566
1567 if (!(ptr = GlobalLock16( handle ))) return 0;
1568 if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1569
1570 /* Search for this handle inside all tasks */
1571
1572 *hTask = hFirstTask;
1573 while (*hTask)
1574 {
1575 TDB *pTask = (TDB *)GlobalLock16( *hTask );
1576 if ((*hTask == handle) ||
1577 (pTask->hInstance == handle) ||
1578 (pTask->hQueue == handle) ||
1579 (pTask->hPDB == handle)) return pTask->hModule;
1580 *hTask = pTask->hNext;
1581 }
1582
1583 /* Check the owner for module handle */
1584
1585 owner = FarGetOwner( handle );
1586 if (!(ptr = GlobalLock16( owner ))) return 0;
1587 if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1588
1589 /* Search for the owner inside all tasks */
1590
1591 *hTask = hFirstTask;
1592 while (*hTask)
1593 {
1594 TDB *pTask = (TDB *)GlobalLock16( *hTask );
1595 if ((*hTask == owner) ||
1596 (pTask->hInstance == owner) ||
1597 (pTask->hQueue == owner) ||
1598 (pTask->hPDB == owner)) return pTask->hModule;
1599 *hTask = pTask->hNext;
1600 }
1601
1602 return 0;
1603 }
1604
1605 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1606 {
1607 HTASK16 dummy;
1608 return GetExePtrHelper( handle, &dummy );
1609 }
1610
1611 void WINAPI WIN16_GetExePtr( CONTEXT *context )
1612 {
1613 WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
1614 HANDLE16 handle = (HANDLE16)stack[2];
1615 HTASK16 hTask = 0;
1616 HMODULE16 hModule;
1617
1618 hModule = GetExePtrHelper( handle, &hTask );
1619
1620 AX_reg(context) = CX_reg(context) = hModule;
1621 if (hTask) ES_reg(context) = hTask;
1622 }
1623
1624 /***********************************************************************
1625 * TaskFirst (TOOLHELP.63)
1626 */
1627 BOOL16 WINAPI TaskFirst( TASKENTRY *lpte )
1628 {
1629 lpte->hNext = hFirstTask;
1630 return TaskNext( lpte );
1631 }
1632
1633
1634 /***********************************************************************
1635 * TaskNext (TOOLHELP.64)
1636 */
1637 BOOL16 WINAPI TaskNext( TASKENTRY *lpte )
1638 {
1639 TDB *pTask;
1640 INSTANCEDATA *pInstData;
1641
1642 TRACE(toolhelp, "(%p): task=%04x\n", lpte, lpte->hNext );
1643 if (!lpte->hNext) return FALSE;
1644 pTask = (TDB *)GlobalLock16( lpte->hNext );
1645 if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1646 pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( pTask->hInstance, 0 );
1647 lpte->hTask = lpte->hNext;
1648 lpte->hTaskParent = pTask->hParent;
1649 lpte->hInst = pTask->hInstance;
1650 lpte->hModule = pTask->hModule;
1651 lpte->wSS = SELECTOROF( pTask->thdb->cur_stack );
1652 lpte->wSP = OFFSETOF( pTask->thdb->cur_stack );
1653 lpte->wStackTop = pInstData->stacktop;
1654 lpte->wStackMinimum = pInstData->stackmin;
1655 lpte->wStackBottom = pInstData->stackbottom;
1656 lpte->wcEvents = pTask->nEvents;
1657 lpte->hQueue = pTask->hQueue;
1658 strncpy( lpte->szModule, pTask->module_name, 8 );
1659 lpte->szModule[8] = '\0';
1660 lpte->wPSPOffset = 0x100; /*??*/
1661 lpte->hNext = pTask->hNext;
1662 return TRUE;
1663 }
1664
1665
1666 /***********************************************************************
1667 * TaskFindHandle (TOOLHELP.65)
1668 */
1669 BOOL16 WINAPI TaskFindHandle( TASKENTRY *lpte, HTASK16 hTask )
1670 {
1671 lpte->hNext = hTask;
1672 return TaskNext( lpte );
1673 }
1674
1675
1676 /***********************************************************************
1677 * GetAppCompatFlags16 (KERNEL.354)
1678 */
1679 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1680 {
1681 return GetAppCompatFlags32( hTask );
1682 }
1683
1684
1685 /***********************************************************************
1686 * GetAppCompatFlags32 (USER32.206)
1687 */
1688 DWORD WINAPI GetAppCompatFlags32( HTASK32 hTask )
1689 {
1690 TDB *pTask;
1691
1692 if (!hTask) hTask = GetCurrentTask();
1693 if (!(pTask=(TDB *)GlobalLock16( (HTASK16)hTask ))) return 0;
1694 if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1695 return pTask->compat_flags;
1696 }
Windows API implementation