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Added ERROR_sig.
[wine/multimedia.git] / msdos / dpmi.c
blobdcbd915a6f7984ba4dd34c10b2c2ad890dceca51
1 /*
2 * DPMI 0.9 emulation
3 *
4 * Copyright 1995 Alexandre Julliard
5 */
6
7 #include <unistd.h>
8 #include <string.h>
9 #include "windef.h"
10 #include "wine/winbase16.h"
11 #include "ldt.h"
12 #include "global.h"
13 #include "module.h"
14 #include "miscemu.h"
15 #include "msdos.h"
16 #include "task.h"
17 #include "thread.h" /* for !MZ_SUPPORTED */
18 #include "stackframe.h" /* for !MZ_SUPPORTED */
19 #include "toolhelp.h"
20 #include "selectors.h"
21 #include "process.h"
22 #include "callback.h"
23 #include "debug.h"
24
25 DEFAULT_DEBUG_CHANNEL(int31)
26
27 #define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
28
29 void CreateBPB(int drive, BYTE *data, BOOL16 limited); /* defined in int21.c */
30
31 static void* lastvalloced = NULL;
32
33 /* Structure for real-mode callbacks */
34 typedef struct
35 {
36 DWORD edi;
37 DWORD esi;
38 DWORD ebp;
39 DWORD reserved;
40 DWORD ebx;
41 DWORD edx;
42 DWORD ecx;
43 DWORD eax;
44 WORD fl;
45 WORD es;
46 WORD ds;
47 WORD fs;
48 WORD gs;
49 WORD ip;
50 WORD cs;
51 WORD sp;
52 WORD ss;
53 } REALMODECALL;
54
55
56
57 typedef struct tagRMCB {
58 DWORD address;
59 DWORD proc_ofs,proc_sel;
60 DWORD regs_ofs,regs_sel;
61 struct tagRMCB *next;
62 } RMCB;
63
64 static RMCB *FirstRMCB = NULL;
65
66 UINT16 DPMI_wrap_seg;
67
68 /**********************************************************************
69 * DPMI_xalloc
70 * special virtualalloc, allocates lineary monoton growing memory.
71 * (the usual VirtualAlloc does not satisfy that restriction)
72 */
73 static LPVOID
74 DPMI_xalloc(int len) {
75 LPVOID ret;
76 LPVOID oldlastv = lastvalloced;
77
78 if (lastvalloced) {
79 int xflag = 0;
80 ret = NULL;
81 while (!ret) {
82 ret=VirtualAlloc(lastvalloced,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
83 if (!ret)
84 lastvalloced = (char *) lastvalloced + 0x10000;
85 /* we failed to allocate one in the first round.
86 * try non-linear
87 */
88 if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
89 FIXME(int31,"failed to allocate lineary growing memory (%d bytes), using non-linear growing...\n",len);
90 xflag++;
91 }
92 /* if we even fail to allocate something in the next
93 * round, return NULL
94 */
95 if ((xflag==1) && (lastvalloced >= oldlastv))
96 xflag++;
97 if ((xflag==2) && (lastvalloced < oldlastv)) {
98 FIXME(int31,"failed to allocate any memory of %d bytes!\n",len);
99 return NULL;
100 }
101 }
102 } else
103 ret=VirtualAlloc(NULL,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
104 lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
105 return ret;
106 }
107
108 static void
109 DPMI_xfree(LPVOID ptr) {
110 VirtualFree(ptr,0,MEM_RELEASE);
111 }
112
113 /* FIXME: perhaps we could grow this mapped area... */
114 static LPVOID
115 DPMI_xrealloc(LPVOID ptr,int newsize) {
116 MEMORY_BASIC_INFORMATION mbi;
117 LPVOID newptr;
118
119 newptr = DPMI_xalloc(newsize);
120 if (ptr) {
121 if (!VirtualQuery(ptr,&mbi,sizeof(mbi))) {
122 FIXME(int31,"realloc of DPMI_xallocd region %p?\n",ptr);
123 return NULL;
124 }
125 if (mbi.State == MEM_FREE) {
126 FIXME(int31,"realloc of DPMI_xallocd region %p?\n",ptr);
127 return NULL;
128 }
129 /* We do not shrink allocated memory. most reallocs
130 * only do grows anyway
131 */
132 if (newsize<=mbi.RegionSize)
133 return ptr;
134 memcpy(newptr,ptr,mbi.RegionSize);
135 DPMI_xfree(ptr);
136 }
137 return newptr;
138 }
139 /**********************************************************************
140 * INT_GetRealModeContext
141 */
142 static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT *context )
143 {
144 EAX_reg(context) = call->eax;
145 EBX_reg(context) = call->ebx;
146 ECX_reg(context) = call->ecx;
147 EDX_reg(context) = call->edx;
148 ESI_reg(context) = call->esi;
149 EDI_reg(context) = call->edi;
150 EBP_reg(context) = call->ebp;
151 EFL_reg(context) = call->fl | V86_FLAG;
152 EIP_reg(context) = call->ip;
153 ESP_reg(context) = call->sp;
154 CS_reg(context) = call->cs;
155 DS_reg(context) = call->ds;
156 ES_reg(context) = call->es;
157 FS_reg(context) = call->fs;
158 GS_reg(context) = call->gs;
159 SS_reg(context) = call->ss;
160 V86BASE(context) = (DWORD) DOSMEM_MemoryBase(0);
161 }
162
163
164 /**********************************************************************
165 * INT_SetRealModeContext
166 */
167 static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT *context )
168 {
169 call->eax = EAX_reg(context);
170 call->ebx = EBX_reg(context);
171 call->ecx = ECX_reg(context);
172 call->edx = EDX_reg(context);
173 call->esi = ESI_reg(context);
174 call->edi = EDI_reg(context);
175 call->ebp = EBP_reg(context);
176 call->fl = FL_reg(context);
177 call->ip = IP_reg(context);
178 call->sp = SP_reg(context);
179 call->cs = CS_reg(context);
180 call->ds = DS_reg(context);
181 call->es = ES_reg(context);
182 call->fs = FS_reg(context);
183 call->gs = GS_reg(context);
184 call->ss = SS_reg(context);
185 }
186
187
188 /**********************************************************************
189 * DPMI_CallRMCBProc
190 *
191 * This routine does the hard work of calling a callback procedure.
192 */
193 static void DPMI_CallRMCBProc( CONTEXT *context, RMCB *rmcb, WORD flag )
194 {
195 if (IS_SELECTOR_SYSTEM( rmcb->proc_sel )) {
196 /* Wine-internal RMCB, call directly */
197 ((RMCBPROC)rmcb->proc_ofs)(context);
198 } else {
199 #ifdef __i386__
200 UINT16 ss,es;
201 DWORD edi;
202
203 INT_SetRealModeContext((REALMODECALL *)PTR_SEG_OFF_TO_LIN( rmcb->regs_sel, rmcb->regs_ofs ), context);
204 ss = SELECTOR_AllocBlock( DOSMEM_MemoryBase(0) + (DWORD)(SS_reg(context)<<4), 0x10000, SEGMENT_DATA, FALSE, FALSE );
205
206 FIXME(int31,"untested!\n");
207
208 /* The called proc ends with an IRET, and takes these parameters:
209 * DS:ESI = pointer to real-mode SS:SP
210 * ES:EDI = pointer to real-mode call structure
211 * It returns:
212 * ES:EDI = pointer to real-mode call structure (may be a copy)
213 * It is the proc's responsibility to change the return CS:IP in the
214 * real-mode call structure. */
215 if (flag & 1) {
216 int _clobber;
217 /* 32-bit DPMI client */
218 __asm__ __volatile__(
219 "pushl %%es\n"
220 "pushl %%ds\n"
221 "pushfl\n"
222 "movl %5,%%es\n"
223 "movl %4,%%ds\n"
224 "lcall %3\n"
225 "popl %%ds\n"
226 "movl %%es,%0\n"
227 "popl %%es\n"
228 : "=g" (es), "=D" (edi), "=S" (_clobber)
229 : "m" (rmcb->proc_ofs),
230 "g" (ss), "g" (rmcb->regs_sel),
231 "S" (ESP_reg(context)), "1" (rmcb->regs_ofs)
232 : "ecx", "edx", "ebp" );
233 } else {
234 /* 16-bit DPMI client */
235 CONTEXT ctx = *context;
236 CS_reg(&ctx) = rmcb->proc_sel;
237 EIP_reg(&ctx) = rmcb->proc_ofs;
238 DS_reg(&ctx) = ss;
239 ESI_reg(&ctx) = ESP_reg(context);
240 ES_reg(&ctx) = rmcb->regs_sel;
241 EDI_reg(&ctx) = rmcb->regs_ofs;
242 Callbacks->CallRegisterShortProc(&ctx, 2);
243 es = ES_reg(&ctx);
244 edi = EDI_reg(&ctx);
245 }
246 UnMapLS(PTR_SEG_OFF_TO_SEGPTR(ss,0));
247 INT_GetRealModeContext((REALMODECALL*)PTR_SEG_OFF_TO_LIN( es, edi ), context);
248 #else
249 ERR(int31,"RMCBs only implemented for i386\n");
250 #endif
251 }
252 }
253
254
255 /**********************************************************************
256 * DPMI_CallRMProc
257 *
258 * This routine does the hard work of calling a real mode procedure.
259 */
260 int DPMI_CallRMProc( CONTEXT *context, LPWORD stack, int args, int iret )
261 {
262 LPWORD stack16;
263 #ifndef MZ_SUPPORTED
264 THDB *thdb = THREAD_Current();
265 WORD sel;
266 SEGPTR seg_addr;
267 #endif /* !MZ_SUPPORTED */
268 LPVOID addr = NULL; /* avoid gcc warning */
269 TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
270 NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
271 RMCB *CurrRMCB;
272 int alloc = 0, already = 0;
273
274 GlobalUnlock16( GetCurrentTask() );
275
276 TRACE(int31, "EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
277 EAX_reg(context), EBX_reg(context), ECX_reg(context), EDX_reg(context) );
278 TRACE(int31, "ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
279 ESI_reg(context), EDI_reg(context), ES_reg(context), DS_reg(context),
280 CS_reg(context), IP_reg(context), args, iret?"IRET":"FAR" );
281
282 callrmproc_again:
283
284 /* shortcut for chaining to internal interrupt handlers */
285 if ((CS_reg(context) == 0xF000) && iret) {
286 return INT_RealModeInterrupt( IP_reg(context)/4, context);
287 }
288
289 /* shortcut for RMCBs */
290 CurrRMCB = FirstRMCB;
291
292 while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
293 CurrRMCB = CurrRMCB->next;
294
295 #ifdef MZ_SUPPORTED
296 if (!(CurrRMCB || pModule->lpDosTask)) {
297 FIXME(int31,"DPMI real-mode call using DOS VM task system, not fully tested!\n");
298 TRACE(int31,"creating VM86 task\n");
299 if (!MZ_InitTask( MZ_AllocDPMITask( pModule->self ) )) {
300 ERR(int31,"could not setup VM86 task\n");
301 return 1;
302 }
303 }
304 if (!already) {
305 if (!SS_reg(context)) {
306 alloc = 1; /* allocate default stack */
307 stack16 = addr = DOSMEM_GetBlock( pModule->self, 64, (UINT16 *)&(SS_reg(context)) );
308 SP_reg(context) = 64-2;
309 stack16 += 32-1;
310 if (!addr) {
311 ERR(int31,"could not allocate default stack\n");
312 return 1;
313 }
314 } else {
315 stack16 = CTX_SEG_OFF_TO_LIN(context, SS_reg(context), ESP_reg(context));
316 }
317 SP_reg(context) -= (args + (iret?1:0)) * sizeof(WORD);
318 #else
319 if (!already) {
320 stack16 = THREAD_STACK16(thdb);
321 #endif
322 stack16 -= args;
323 if (args) memcpy(stack16, stack, args*sizeof(WORD) );
324 /* push flags if iret */
325 if (iret) {
326 stack16--; args++;
327 *stack16 = FL_reg(context);
328 }
329 #ifdef MZ_SUPPORTED
330 /* push return address (return to interrupt wrapper) */
331 *(--stack16) = DPMI_wrap_seg;
332 *(--stack16) = 0;
333 /* adjust stack */
334 SP_reg(context) -= 2*sizeof(WORD);
335 #endif
336 already = 1;
337 }
338
339 if (CurrRMCB) {
340 /* RMCB call, invoke protected-mode handler directly */
341 DPMI_CallRMCBProc(context, CurrRMCB, pModule->lpDosTask?pModule->lpDosTask->dpmi_flag:0);
342 /* check if we returned to where we thought we would */
343 if ((CS_reg(context) != DPMI_wrap_seg) ||
344 (IP_reg(context) != 0)) {
345 /* we need to continue at different address in real-mode space,
346 so we need to set it all up for real mode again */
347 goto callrmproc_again;
348 }
349 } else {
350 #ifdef MZ_SUPPORTED
351 #if 0 /* this was probably unnecessary */
352 /* push call address */
353 *(--stack16) = CS_reg(context);
354 *(--stack16) = IP_reg(context);
355 /* adjust stack */
356 SP_reg(context) -= 2*sizeof(WORD);
357 /* set initial CS:IP to the wrapper's "lret" */
358 CS_reg(context) = DPMI_wrap_seg;
359 IP_reg(context) = 2;
360 #endif
361 TRACE(int31,"entering real mode...\n");
362 DOSVM_Enter( context );
363 TRACE(int31,"returned from real-mode call\n");
364 #else
365 addr = CTX_SEG_OFF_TO_LIN(context, CS_reg(context), EIP_reg(context));
366 sel = SELECTOR_AllocBlock( addr, 0x10000, SEGMENT_CODE, FALSE, FALSE );
367 seg_addr = PTR_SEG_OFF_TO_SEGPTR( sel, 0 );
368
369 CS_reg(context) = HIWORD(seg_addr);
370 IP_reg(context) = LOWORD(seg_addr);
371 EBP_reg(context) = OFFSETOF( thdb->cur_stack )
372 + (WORD)&((STACK16FRAME*)0)->bp;
373 Callbacks->CallRegisterShortProc(context, args*sizeof(WORD));
374 UnMapLS(seg_addr);
375 #endif
376 }
377 if (alloc) DOSMEM_FreeBlock( pModule->self, addr );
378 return 0;
379 }
380
381
382 /**********************************************************************
383 * CallRMInt
384 */
385 static void CallRMInt( CONTEXT *context )
386 {
387 CONTEXT realmode_ctx;
388 FARPROC16 rm_int = INT_GetRMHandler( BL_reg(context) );
389 REALMODECALL *call = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context),
390 DI_reg(context) );
391 INT_GetRealModeContext( call, &realmode_ctx );
392
393 /* we need to check if a real-mode program has hooked the interrupt */
394 if (HIWORD(rm_int)!=0xF000) {
395 /* yup, which means we need to switch to real mode... */
396 CS_reg(&realmode_ctx) = HIWORD(rm_int);
397 EIP_reg(&realmode_ctx) = LOWORD(rm_int);
398 if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
399 SET_CFLAG(context);
400 } else {
401 RESET_CFLAG(context);
402 /* use the IP we have instead of BL_reg, in case some apps
403 decide to move interrupts around for whatever reason... */
404 if (INT_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx ))
405 SET_CFLAG(context);
406 if (EFL_reg(context)&1) {
407 FIXME(int31,"%02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
408 BL_reg(context), EAX_reg(&realmode_ctx), EBX_reg(&realmode_ctx),
409 ECX_reg(&realmode_ctx), EDX_reg(&realmode_ctx));
410 FIXME(int31," ESI=%08lx EDI=%08lx DS=%04lx ES=%04lx\n",
411 ESI_reg(&realmode_ctx), EDI_reg(&realmode_ctx),
412 DS_reg(&realmode_ctx), ES_reg(&realmode_ctx) );
413 }
414 }
415 INT_SetRealModeContext( call, &realmode_ctx );
416 }
417
418
419 static void CallRMProc( CONTEXT *context, int iret )
420 {
421 REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
422 CONTEXT context16;
423
424 TRACE(int31, "RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
425 p->eax, p->ebx, p->ecx, p->edx);
426 TRACE(int31, " ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
427 p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
428
429 if (!(p->cs) && !(p->ip)) { /* remove this check
430 if Int21/6501 case map function
431 has been implemented */
432 SET_CFLAG(context);
433 return;
434 }
435 INT_GetRealModeContext(p, &context16);
436 DPMI_CallRMProc( &context16, ((LPWORD)PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context)))+3,
437 CX_reg(context), iret );
438 INT_SetRealModeContext(p, &context16);
439 }
440
441
442 static void WINAPI WINE_UNUSED RMCallbackProc( RMCB *rmcb )
443 {
444 /* This routine should call DPMI_CallRMCBProc, but we don't have the
445 register structure available - this is easily fixed by going through
446 a Win16 register relay instead of calling RMCallbackProc "directly",
447 but I won't bother at this time. */
448 FIXME(int31,"not properly supported on your architecture!\n");
449 }
450
451 static RMCB *DPMI_AllocRMCB( void )
452 {
453 RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
454 UINT16 uParagraph;
455
456 if (NewRMCB)
457 {
458 #ifdef MZ_SUPPORTED
459 LPVOID RMCBmem = DOSMEM_GetBlock(0, 4, &uParagraph);
460 LPBYTE p = RMCBmem;
461
462 *p++ = 0xcd; /* RMCB: */
463 *p++ = 0x31; /* int $0x31 */
464 /* it is the called procedure's task to change the return CS:EIP
465 the DPMI 0.9 spec states that if it doesn't, it will be called again */
466 *p++ = 0xeb;
467 *p++ = 0xfc; /* jmp RMCB */
468 #else
469 LPVOID RMCBmem = DOSMEM_GetBlock(0, 15, &uParagraph);
470 LPBYTE p = RMCBmem;
471
472 *p++ = 0x68; /* pushl */
473 *(LPVOID *)p = NewRMCB;
474 p+=4;
475 *p++ = 0x9a; /* lcall */
476 *(FARPROC16 *)p = (FARPROC16)RMCallbackProc; /* FIXME: register relay */
477 p+=4;
478 GET_CS(*(WORD *)p);
479 p+=2;
480 *p++=0xc3; /* lret (FIXME?) */
481 #endif
482 NewRMCB->address = MAKELONG(0, uParagraph);
483 NewRMCB->next = FirstRMCB;
484 FirstRMCB = NewRMCB;
485 }
486 return NewRMCB;
487 }
488
489
490 static void AllocRMCB( CONTEXT *context )
491 {
492 RMCB *NewRMCB = DPMI_AllocRMCB();
493
494 TRACE(int31, "Function to call: %04x:%04x\n", (WORD)DS_reg(context), SI_reg(context) );
495
496 if (NewRMCB)
497 {
498 /* FIXME: if 32-bit DPMI client, use ESI and EDI */
499 NewRMCB->proc_ofs = SI_reg(context);
500 NewRMCB->proc_sel = DS_reg(context);
501 NewRMCB->regs_ofs = DI_reg(context);
502 NewRMCB->regs_sel = ES_reg(context);
503 CX_reg(context) = HIWORD(NewRMCB->address);
504 DX_reg(context) = LOWORD(NewRMCB->address);
505 }
506 else
507 {
508 AX_reg(context) = 0x8015; /* callback unavailable */
509 SET_CFLAG(context);
510 }
511 }
512
513
514 FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
515 {
516 RMCB *NewRMCB = DPMI_AllocRMCB();
517
518 if (NewRMCB) {
519 NewRMCB->proc_ofs = (DWORD)proc;
520 NewRMCB->proc_sel = 0;
521 NewRMCB->regs_ofs = 0;
522 NewRMCB->regs_sel = 0;
523 return (FARPROC16)(NewRMCB->address);
524 }
525 return NULL;
526 }
527
528
529 static int DPMI_FreeRMCB( DWORD address )
530 {
531 RMCB *CurrRMCB = FirstRMCB;
532 RMCB *PrevRMCB = NULL;
533
534 while (CurrRMCB && (CurrRMCB->address != address))
535 {
536 PrevRMCB = CurrRMCB;
537 CurrRMCB = CurrRMCB->next;
538 }
539 if (CurrRMCB)
540 {
541 if (PrevRMCB)
542 PrevRMCB->next = CurrRMCB->next;
543 else
544 FirstRMCB = CurrRMCB->next;
545 DOSMEM_FreeBlock(0, DOSMEM_MapRealToLinear(CurrRMCB->address));
546 HeapFree(GetProcessHeap(), 0, CurrRMCB);
547 return 0;
548 }
549 return 1;
550 }
551
552
553 static void FreeRMCB( CONTEXT *context )
554 {
555 FIXME(int31, "callback address: %04x:%04x\n",
556 CX_reg(context), DX_reg(context));
557
558 if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
559 AX_reg(context) = 0x8024; /* invalid callback address */
560 SET_CFLAG(context);
561 }
562 }
563
564
565 void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
566 {
567 DPMI_FreeRMCB( (DWORD)proc );
568 }
569
570
571 #ifdef MZ_SUPPORTED
572 /* (see loader/dos/module.c, function MZ_InitDPMI) */
573
574 static void StartPM( CONTEXT *context, LPDOSTASK lpDosTask )
575 {
576 char *base = DOSMEM_MemoryBase(0);
577 UINT16 cs, ss, ds, es;
578 CONTEXT pm_ctx;
579
580 RESET_CFLAG(context);
581 lpDosTask->dpmi_flag = AX_reg(context);
582 /* our mode switch wrapper have placed the desired CS into DX */
583 cs = SELECTOR_AllocBlock( base + (DWORD)(DX_reg(context)<<4), 0x10000, SEGMENT_CODE, FALSE, FALSE );
584 ss = SELECTOR_AllocBlock( base + (DWORD)(SS_reg(context)<<4), 0x10000, SEGMENT_DATA, FALSE, FALSE );
585 ds = SELECTOR_AllocBlock( base + (DWORD)(DS_reg(context)<<4), 0x10000, SEGMENT_DATA, FALSE, FALSE );
586 es = SELECTOR_AllocBlock( base + (DWORD)(lpDosTask->psp_seg<<4), 0x100, SEGMENT_DATA, FALSE, FALSE );
587
588 pm_ctx = *context;
589 CS_reg(&pm_ctx) = lpDosTask->dpmi_sel;
590 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
591 AX_reg(&pm_ctx) = ss;
592 DX_reg(&pm_ctx) = cs;
593 DS_reg(&pm_ctx) = ds;
594 ES_reg(&pm_ctx) = es;
595 FS_reg(&pm_ctx) = 0;
596 GS_reg(&pm_ctx) = 0;
597
598 TRACE(int31,"DOS program is now entering protected mode\n");
599 Callbacks->CallRegisterShortProc(&pm_ctx, 0);
600
601 /* in the current state of affairs, we won't ever actually return here... */
602
603 UnMapLS(PTR_SEG_OFF_TO_SEGPTR(es,0));
604 UnMapLS(PTR_SEG_OFF_TO_SEGPTR(ds,0));
605 UnMapLS(PTR_SEG_OFF_TO_SEGPTR(ss,0));
606 UnMapLS(PTR_SEG_OFF_TO_SEGPTR(cs,0));
607 }
608 #endif
609
610 /**********************************************************************
611 * INT_Int31Handler
612 *
613 * Handler for int 31h (DPMI).
614 */
615
616 void WINAPI INT_Int31Handler( CONTEXT *context )
617 {
618 /*
619 * Note: For Win32s processes, the whole linear address space is
620 * shifted by 0x10000 relative to the OS linear address space.
621 * See the comment in msdos/vxd.c.
622 */
623 DWORD offset = W32S_APPLICATION() ? W32S_OFFSET : 0;
624
625 DWORD dw;
626 BYTE *ptr;
627
628 TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
629 NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
630
631 GlobalUnlock16( GetCurrentTask() );
632
633 #ifdef MZ_SUPPORTED
634 if (ISV86(context) && pModule && pModule->lpDosTask) {
635 /* Called from real mode, check if it's our wrapper */
636 TRACE(int31,"called from real mode\n");
637 if (CS_reg(context)==pModule->lpDosTask->dpmi_seg) {
638 /* This is the protected mode switch */
639 StartPM(context,pModule->lpDosTask);
640 return;
641 } else
642 if (CS_reg(context)==pModule->lpDosTask->xms_seg) {
643 /* This is the XMS driver entry point */
644 XMS_Handler(context);
645 return;
646 } else
647 {
648 /* Check for RMCB */
649 RMCB *CurrRMCB = FirstRMCB;
650
651 while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
652 CurrRMCB = CurrRMCB->next;
653
654 if (CurrRMCB) {
655 /* RMCB call, propagate to protected-mode handler */
656 DPMI_CallRMCBProc(context, CurrRMCB, pModule->lpDosTask->dpmi_flag);
657 return;
658 }
659 }
660 }
661 #endif
662
663 RESET_CFLAG(context);
664 switch(AX_reg(context))
665 {
666 case 0x0000: /* Allocate LDT descriptors */
667 TRACE(int31,"allocate LDT descriptors (%d)\n",CX_reg(context));
668 if (!(AX_reg(context) = AllocSelectorArray16( CX_reg(context) )))
669 {
670 TRACE(int31,"failed\n");
671 AX_reg(context) = 0x8011; /* descriptor unavailable */
672 SET_CFLAG(context);
673 }
674 TRACE(int31,"success, array starts at 0x%04x\n",AX_reg(context));
675 break;
676
677 case 0x0001: /* Free LDT descriptor */
678 TRACE(int31,"free LDT descriptor (0x%04x)\n",BX_reg(context));
679 if (FreeSelector16( BX_reg(context) ))
680 {
681 AX_reg(context) = 0x8022; /* invalid selector */
682 SET_CFLAG(context);
683 }
684 else
685 {
686 /* If a segment register contains the selector being freed, */
687 /* set it to zero. */
688 if (!((DS_reg(context)^BX_reg(context)) & ~3)) DS_reg(context) = 0;
689 if (!((ES_reg(context)^BX_reg(context)) & ~3)) ES_reg(context) = 0;
690 if (!((FS_reg(context)^BX_reg(context)) & ~3)) FS_reg(context) = 0;
691 if (!((GS_reg(context)^BX_reg(context)) & ~3)) GS_reg(context) = 0;
692 }
693 break;
694
695 case 0x0002: /* Real mode segment to descriptor */
696 TRACE(int31,"real mode segment to descriptor (0x%04x)\n",BX_reg(context));
697 {
698 WORD entryPoint = 0; /* KERNEL entry point for descriptor */
699 switch(BX_reg(context))
700 {
701 case 0x0000: entryPoint = 183; break; /* __0000H */
702 case 0x0040: entryPoint = 193; break; /* __0040H */
703 case 0xa000: entryPoint = 174; break; /* __A000H */
704 case 0xb000: entryPoint = 181; break; /* __B000H */
705 case 0xb800: entryPoint = 182; break; /* __B800H */
706 case 0xc000: entryPoint = 195; break; /* __C000H */
707 case 0xd000: entryPoint = 179; break; /* __D000H */
708 case 0xe000: entryPoint = 190; break; /* __E000H */
709 case 0xf000: entryPoint = 194; break; /* __F000H */
710 default:
711 AX_reg(context) = DOSMEM_AllocSelector(BX_reg(context));
712 break;
713 }
714 if (entryPoint)
715 AX_reg(context) = LOWORD(NE_GetEntryPoint(
716 GetModuleHandle16( "KERNEL" ),
717 entryPoint ));
718 }
719 break;
720
721 case 0x0003: /* Get next selector increment */
722 TRACE(int31,"get selector increment (__AHINCR)\n");
723 AX_reg(context) = __AHINCR;
724 break;
725
726 case 0x0004: /* Lock selector (not supported) */
727 FIXME(int31,"lock selector not supported\n");
728 AX_reg(context) = 0; /* FIXME: is this a correct return value? */
729 break;
730
731 case 0x0005: /* Unlock selector (not supported) */
732 FIXME(int31,"unlock selector not supported\n");
733 AX_reg(context) = 0; /* FIXME: is this a correct return value? */
734 break;
735
736 case 0x0006: /* Get selector base address */
737 TRACE(int31,"get selector base address (0x%04x)\n",BX_reg(context));
738 if (!(dw = GetSelectorBase( BX_reg(context) )))
739 {
740 AX_reg(context) = 0x8022; /* invalid selector */
741 SET_CFLAG(context);
742 }
743 else
744 {
745 #ifdef MZ_SUPPORTED
746 if (pModule && pModule->lpDosTask) {
747 DWORD base = (DWORD)DOSMEM_MemoryBase(pModule->self);
748 if ((dw >= base) && (dw < base + 0x110000)) dw -= base;
749 }
750 #endif
751 CX_reg(context) = HIWORD(W32S_WINE2APP(dw, offset));
752 DX_reg(context) = LOWORD(W32S_WINE2APP(dw, offset));
753 }
754 break;
755
756 case 0x0007: /* Set selector base address */
757 TRACE(int31, "set selector base address (0x%04x,0x%08lx)\n",
758 BX_reg(context),
759 W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context)), offset));
760 dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)), offset);
761 #ifdef MZ_SUPPORTED
762 /* well, what else could we possibly do? */
763 if (pModule && pModule->lpDosTask) {
764 if (dw < 0x110000) dw += (DWORD)DOSMEM_MemoryBase(pModule->self);
765 }
766 #endif
767 SetSelectorBase(BX_reg(context), dw);
768 break;
769
770 case 0x0008: /* Set selector limit */
771 TRACE(int31,"set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
772 dw = MAKELONG( DX_reg(context), CX_reg(context) );
773 #ifdef MZ_SUPPORTED
774 if (pModule && pModule->lpDosTask) {
775 DWORD base = GetSelectorBase( BX_reg(context) );
776 if ((dw == 0xffffffff) || ((base < 0x110000) && (base + dw > 0x110000))) {
777 AX_reg(context) = 0x8021; /* invalid value */
778 SET_CFLAG(context);
779 break;
780 }
781 }
782 #endif
783 SetSelectorLimit16( BX_reg(context), dw );
784 break;
785
786 case 0x0009: /* Set selector access rights */
787 TRACE(int31,"set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
788 SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
789 break;
790
791 case 0x000a: /* Allocate selector alias */
792 TRACE(int31,"allocate selector alias (0x%04x)\n",BX_reg(context));
793 if (!(AX_reg(context) = AllocCStoDSAlias16( BX_reg(context) )))
794 {
795 AX_reg(context) = 0x8011; /* descriptor unavailable */
796 SET_CFLAG(context);
797 }
798 break;
799
800 case 0x000b: /* Get descriptor */
801 TRACE(int31,"get descriptor (0x%04x)\n",BX_reg(context));
802 {
803 ldt_entry entry;
804 LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
805 entry.base = W32S_WINE2APP(entry.base, offset);
806
807 /* FIXME: should use ES:EDI for 32-bit clients */
808 LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(context),
809 DI_reg(context) ), &entry );
810 }
811 break;
812
813 case 0x000c: /* Set descriptor */
814 TRACE(int31,"set descriptor (0x%04x)\n",BX_reg(context));
815 {
816 ldt_entry entry;
817 LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(context),
818 DI_reg(context) ), &entry );
819 entry.base = W32S_APP2WINE(entry.base, offset);
820
821 LDT_SetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
822 }
823 break;
824
825 case 0x000d: /* Allocate specific LDT descriptor */
826 FIXME(int31,"allocate descriptor (0x%04x), stub!\n",BX_reg(context));
827 AX_reg(context) = 0x8011; /* descriptor unavailable */
828 SET_CFLAG(context);
829 break;
830 case 0x0100: /* Allocate DOS memory block */
831 TRACE(int31,"allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
832 dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
833 if (dw) {
834 AX_reg(context) = HIWORD(dw);
835 DX_reg(context) = LOWORD(dw);
836 } else {
837 AX_reg(context) = 0x0008; /* insufficient memory */
838 BX_reg(context) = DOSMEM_Available(0)>>4;
839 SET_CFLAG(context);
840 }
841 break;
842 case 0x0101: /* Free DOS memory block */
843 TRACE(int31,"free DOS memory block (0x%04x)\n",DX_reg(context));
844 dw = GlobalDOSFree16(DX_reg(context));
845 if (!dw) {
846 AX_reg(context) = 0x0009; /* memory block address invalid */
847 SET_CFLAG(context);
848 }
849 break;
850 case 0x0200: /* get real mode interrupt vector */
851 FIXME(int31,"get realmode interupt vector(0x%02x) unimplemented.\n",
852 BL_reg(context));
853 SET_CFLAG(context);
854 break;
855 case 0x0201: /* set real mode interrupt vector */
856 FIXME(int31, "set realmode interupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
857 SET_CFLAG(context);
858 break;
859 case 0x0204: /* Get protected mode interrupt vector */
860 TRACE(int31,"get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
861 dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
862 CX_reg(context) = HIWORD(dw);
863 DX_reg(context) = LOWORD(dw);
864 break;
865
866 case 0x0205: /* Set protected mode interrupt vector */
867 TRACE(int31,"set protected mode interrupt handler (0x%02x,%p), stub!\n",
868 BL_reg(context),PTR_SEG_OFF_TO_LIN(CX_reg(context),DX_reg(context)));
869 INT_SetPMHandler( BL_reg(context),
870 (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
871 DX_reg(context) ));
872 break;
873
874 case 0x0300: /* Simulate real mode interrupt */
875 CallRMInt( context );
876 break;
877
878 case 0x0301: /* Call real mode procedure with far return */
879 CallRMProc( context, FALSE );
880 break;
881
882 case 0x0302: /* Call real mode procedure with interrupt return */
883 CallRMProc( context, TRUE );
884 break;
885
886 case 0x0303: /* Allocate Real Mode Callback Address */
887 AllocRMCB( context );
888 break;
889
890 case 0x0304: /* Free Real Mode Callback Address */
891 FreeRMCB( context );
892 break;
893
894 case 0x0400: /* Get DPMI version */
895 TRACE(int31,"get DPMI version\n");
896 {
897 SYSTEM_INFO si;
898
899 GetSystemInfo(&si);
900 AX_reg(context) = 0x005a; /* DPMI version 0.90 */
901 BX_reg(context) = 0x0005; /* Flags: 32-bit, virtual memory */
902 CL_reg(context) = si.wProcessorLevel;
903 DX_reg(context) = 0x0102; /* Master/slave interrupt controller base*/
904 break;
905 }
906 case 0x0500: /* Get free memory information */
907 TRACE(int31,"get free memory information\n");
908 {
909 MEMMANINFO mmi;
910
911 mmi.dwSize = sizeof(mmi);
912 MemManInfo16(&mmi);
913 ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(ES_reg(context),DI_reg(context));
914 /* the layout is just the same as MEMMANINFO, but without
915 * the dwSize entry.
916 */
917 memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
918 break;
919 }
920 case 0x0501: /* Allocate memory block */
921 TRACE(int31,"allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
922 if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
923 {
924 AX_reg(context) = 0x8012; /* linear memory not available */
925 SET_CFLAG(context);
926 } else {
927 BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
928 CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
929 }
930 break;
931
932 case 0x0502: /* Free memory block */
933 TRACE(int31, "free memory block (0x%08lx)\n",
934 W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset));
935 DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),
936 SI_reg(context)), offset) );
937 break;
938
939 case 0x0503: /* Resize memory block */
940 TRACE(int31, "resize memory block (0x%08lx,%ld)\n",
941 W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
942 MAKELONG(CX_reg(context),BX_reg(context)));
943 if (!(ptr = (BYTE *)DPMI_xrealloc(
944 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
945 MAKELONG(CX_reg(context),BX_reg(context)))))
946 {
947 AX_reg(context) = 0x8012; /* linear memory not available */
948 SET_CFLAG(context);
949 } else {
950 BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
951 CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
952 }
953 break;
954
955 case 0x0507: /* Modify page attributes */
956 FIXME(int31,"modify page attributes unimplemented\n");
957 break; /* Just ignore it */
958
959 case 0x0600: /* Lock linear region */
960 FIXME(int31,"lock linear region unimplemented\n");
961 break; /* Just ignore it */
962
963 case 0x0601: /* Unlock linear region */
964 FIXME(int31,"unlock linear region unimplemented\n");
965 break; /* Just ignore it */
966
967 case 0x0602: /* Unlock real-mode region */
968 FIXME(int31,"unlock realmode region unimplemented\n");
969 break; /* Just ignore it */
970
971 case 0x0603: /* Lock real-mode region */
972 FIXME(int31,"lock realmode region unimplemented\n");
973 break; /* Just ignore it */
974
975 case 0x0604: /* Get page size */
976 TRACE(int31,"get pagesize\n");
977 BX_reg(context) = 0;
978 CX_reg(context) = VIRTUAL_GetPageSize();
979 break;
980
981 case 0x0702: /* Mark page as demand-paging candidate */
982 FIXME(int31,"mark page as demand-paging candidate\n");
983 break; /* Just ignore it */
984
985 case 0x0703: /* Discard page contents */
986 FIXME(int31,"discard page contents\n");
987 break; /* Just ignore it */
988
989 case 0x0800: /* Physical address mapping */
990 FIXME(int31,"map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
991 if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
992 {
993 AX_reg(context) = 0x8021;
994 SET_CFLAG(context);
995 }
996 else
997 {
998 BX_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
999 CX_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1000 RESET_CFLAG(context);
1001 }
1002 break;
1003
1004 default:
1005 INT_BARF( context, 0x31 );
1006 AX_reg(context) = 0x8001; /* unsupported function */
1007 SET_CFLAG(context);
1008 break;
1009 }
1010
1011 }
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